JP7224366B2 - electronic expansion valve - Google Patents

Description

(Related application)
[0001] This application is filed on August 17, 2018, entitled "Electronic Expansion Valve," Application No. 2018213376030, entitled "Electronic Expansion Valve," Application No. 2018213353433, filed on August 17, 2018, entitled "Electronic Expansion Valve," Application number 2018213375841, filed on August 17, 2018, titled "Electronic Expansion Valve", Application Number 2018213357716, filed on August 17, 2018, titled "Electronic Expansion Valve", filed on August 17, 2018 Application number 2018213352750, entitled "Electronic expansion valve", Application number 2018109433995, filed on August 17, 2018, titled "Electronic expansion valve", Application number 2018109434023, filed on August 17, 2018, titled "Electronic Expansion valve and air conditioning system using this electronic expansion valve”, application number 2018213355354 filed on August 17, 2018, titled “Electronic expansion valve and air conditioning system using this electronic expansion valve”, August 17, 2018 Application No. 2018109416190 filed on Aug. 17, 2018, entitled "Electronic expansion valve and air conditioning system using this electronic expansion valve", Application No. 2018213352892 filed on August 17, 2018, titled "Electronic expansion valve and this electronic expansion valve , application number 2018109427462 filed on August 17, 2018, titled "Electronic expansion valve and air conditioning system using this electronic expansion valve", application number filed on August 17, 2018 201821335213X, entitled "Electronic Expansion Valve and Air Conditioning System Using the Electronic Expansion Valve", the entire texts of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of refrigeration, and more particularly to an electronic expansion valve.

[0003] The electronic expansion valve opens and closes the valve opening opened in the valve body by the movement of the valve rod assembly in the guide sleeve and nut sleeve, thereby achieving the purpose of adjusting the flow rate and reducing the pressure by throttling. It is widely applied in the technical field of equipment. Conventional electronic expansion valves are complicated to install, reducing the reliability and stability of electronic expansion valves.

[0004] Based on this, various embodiments of the present application provide an electronic expansion valve.

[0005] Technical aspects of the present application are as follows.

[0006] An electronic expansion valve includes a valve body, a spindle assembly, a screw assembly, a rotor assembly, a stator assembly and a sleeve. The screw assembly is attached to the guide sleeve, the screw assembly is connected to the rotor assembly, the stator assembly can act on the rotor assembly to drive rotation of the rotor assembly, the rotation of the rotor assembly can move the screw assembly, and the valve A valve opening is formed in the body, a spindle assembly is driven by the screw assembly to open and close the valve opening, and a sleeve is provided to cover one end of the valve body remote from the valve opening.

[0007] The details of one or more implementations of the application are set forth in the drawings and description below. Other features, objects and advantages of the present application will become apparent from the specification, drawings and claims. At the same time, however, it should be ensured that some of the embodiments contain language corresponding to the original technical effects and advantages.

[0008] FIG. 1 is a perspective view of an electronic expansion valve provided by one embodiment; [0009] FIG. 2 is a cross-sectional view of an electronic expansion valve provided by one embodiment; [0010] Figure 2 is a perspective view of an electronic expansion valve provided by another embodiment; 4 is a cross-sectional view of the electronic expansion valve provided by FIG. 3; FIG. [0012] Figure 2 is a cross-sectional view of a valve body provided by an embodiment; [0013] FIG. 4 is a cross-sectional view of a valve body provided with a second mounting step provided by an embodiment; [0014] Figure 4 is a cross-sectional view of a valve body provided by another embodiment; [0015] FIG. 2 is a cross-sectional view of a valve body provided with a debris retention structure provided by one embodiment; [0016] FIG. 9 is an enlarged view at B provided by FIG. 8; [0017] FIG. 4 is a cross-sectional view of a valve body provided with position limits provided by one embodiment; [0018] FIG. 11 is an enlarged view at C provided by FIG. 10; [0019] FIG. 4 is a cross-sectional view of a debris storage structure provided by another embodiment; [0020] FIG. 13 is an enlarged view at D provided by FIG. 12; [0021] Fig. 4 is a cross-sectional view of a guide sleeve provided by an embodiment; [0022] Fig. 4 is a cross-sectional view of a guide sleeve provided by another embodiment; [0023] Fig. 4 is a cross-sectional view of a guide sleeve provided by yet another embodiment; [0024] FIG. 2 is a perspective view of an electronic expansion valve omitting the sleeve and valve body provided by one embodiment; [0025] FIG. 2 is a perspective view of a screw assembly provided by one embodiment; [0026] Fig. 4 is a cross-sectional view of a spindle assembly and a screw assembly provided by an embodiment; [0027] FIG. 4 is a cross-sectional view of an electronic expansion valve provided by another embodiment; [0028] Fig. 21 is a cross-sectional view of the spindle assembly provided by Fig. 20; [0029] FIG. 4 is a cross-sectional view of an electronic expansion valve provided with a noise reduction module provided by one embodiment; [0030] FIG. 4 is a cross-sectional view of a valve body provided with a chamber provided by one embodiment; [0031] Fig. 2 is a cross-sectional view of a noise reduction module provided by one embodiment; [0032] Fig. 4 is a cross-sectional view of a noise reduction module provided by another embodiment; [0033] Fig. 4 is a cross-sectional view of a noise reduction module provided by yet another embodiment; [0034] FIG. 2 is a cross-sectional view of an electronic expansion valve provided with a welded structure provided by an embodiment; [0035] FIG. 28 is an enlarged view at E provided by FIG. 27; [0036] Fig. 5 is an enlarged view at A provided by Fig. 4; [0037] Fig. 4 is a cross-sectional view of a guide sleeve provided by an embodiment; [0038] Fig. 4 is a perspective view of a connector provided by one embodiment; [0039] Fig. 4 is a top view of a connecting hand provided by one embodiment; [0040] Fig. 4 is a perspective view of a nut sleeve provided by one embodiment; [0041] Fig. 4 is a cross-sectional view of a nut sleeve provided by an embodiment;

[0042] In the figure, an electronic expansion valve 100, a medium inlet pipe 101, a medium outlet pipe 102, an axis 103, a valve body first end 104, a valve body second end 105, a first chamfer 106, a second chamfer 107, Weld ring 108, weld bead 109, valve body 10, inlet 10a, outlet 10b, mounting bracket 10c, first mounting step 10d, second mounting step 10e, accommodation chamber 10f, valve port 11, valve chamber 12, through hole 13, Mounting chamber 14 , first positioning step 14 a , position limiting portion 141 , inner side surface 141 a of position limiting portion, outer side surface 141 b of position limiting portion, opening 142 , connecting chamber 15 , mounting seat 110 , mounting hole 111 , guide sleeve 16 , guide hole 16a, spindle hole 16b, plane 161, first cylindrical step 162, step 162a, first cylindrical step first end 162b; first cylindrical step second end 162c, second cylindrical step 163, third cylindrical Step 164, guide structure 165, cam 166, connecting hand 17, first projection 18, connecting groove 19, waste storage structure 120, first waste storage groove 121, first waste guide structure 122, first waste guide portion 122a, second 2. Waste storage groove 123, second waste guide structure 124, second waste guide portion 124a, spindle assembly 20, spindle sleeve 21, spindle 22, groove 221, first spring seat 23, second spring seat 24, elastic member 25 , guide holder 26, ball 27, screw assembly 30, screw 31, second projection 311, nut sleeve 32, nut sleeve first end 32a, nut sleeve second end 32b, locking groove 32c, engagement step 321, Engaging hole 321a, second positioning step 322, stop shoulder 323, sleeve 40, rotor assembly 50, rotor 51, adapter plate 52, position limiting member 53, spring 531, stop portion 531a, stop ring 532, guide piece 54, noise reduction module 60, third protrusion 61, noise reduction hole 62, first hole 621, second hole 622, third hole 623, cylindrical hole 621a, tapered hole 622a, welding structure 70, fourth protrusion 71, convex side 72 , third chamfer 73, pressure equalization passage 80, pressure equalization hole 80a, first equalization passage 81, first equalization hole 811, second equalization hole 812, second equalization passage 82, third equalization A hole 821 , a fourth equalization hole 822 and a fifth equalization hole 823 .

[0043] The present application will now be described in more detail in conjunction with the drawings and specific embodiments.

[0044] As shown in Figures 1 and 2, the present application provides an electronic expansion valve 100 for regulating the flow rate and pressure of a fluid medium applied to an air conditioning refrigeration system. In the present embodiment, the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for exchanging cold and heat in an air conditioning refrigeration system, and the electronic expansion valve 100 squeezes the high-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure gas-liquid two-phase refrigerant. It is used for pressure reduction and heat exchange to achieve the purpose of refrigeration.

[0045] The electronic expansion valve 100 includes a valve body 10, a spindle assembly 20, a screw assembly 30, a sleeve 40, a rotor assembly 50 and a stator assembly (not shown). One end of the screw assembly 30 is connected to the spindle assembly 20, the other end is connected to the rotor assembly 50, the rotor assembly 50 is provided in the sleeve 40, the stator assembly is provided in the sleeve 40, and The stator assembly is energized to generate a magnetic field, which rotates the rotor assembly 50 under the action of this magnetic force, which in turn moves the screw assembly 30 which in turn moves the spindle assembly 20 and the electronic expansion valve. 100 opening and closing are realized to achieve the purpose of adjusting the flow rate and pressure.

[0046] As shown in Fig. 5, the valve body 10 is processed and manufactured from a stainless steel material. Of course, valve body 10 may be fabricated from other materials. In this embodiment, examples are not given one by one. The valve body 10 has a generally cylindrical shape, and in other embodiments the valve body 10 may have other shapes.

The valve body 10 has an axis 103 , and the valve port 11 , the valve chamber 12 , the through hole 13 , the mounting chamber 14 and the connecting chamber 15 are formed on the valve body 10 along the axis 103 in sequence. The valve port 11 is used to extend the spindle assembly 20, thereby controlling the flow rate of the fluid medium at the valve port 11, and when the spindle assembly 20 closes the valve port 11, i.e., the valve port 11 and the valve The electronic expansion valve 100 is closed when communication with the chamber 12 is cut off, and when the spindle assembly 20 releases the seal against the valve port 11, i.e., when the valve port 11 and the valve chamber 12 are communicated with each other, Electronic expansion valve 100 is opened. The through hole 13 is formed at the bottom of the mounting chamber 14 and has a hole diameter smaller than the inner diameter of the mounting chamber 14 . It should be understood that the installation of the through-hole 13 forms a ring-shaped first positioning step 14a at the bottom of the mounting chamber 14, and the mounting chamber 14 and the connecting chamber 15 communicate with each other along the direction of the axis 103.

[0048] The valve body 10 is provided with an inlet 10a and an outlet 10b for entering the fluid medium. A valve port 11 is provided between the inlet 10a and the outlet 10b, the inlet 10a being placed in communication with the valve chamber 12 and the outlet 10b being in communication with the valve port 11, by controlling the movement of the spindle assembly 20, It provides continuity or interruption between the inlet 10a and the outlet 10b.

[0049] Preferably, the inlet 10a is attached with a medium introduction tube 101 for feeding the fluid medium, and the outlet 10b is attached with a medium outlet tube 102 for sending out the fluid medium. In this embodiment, the fluid medium is a refrigerant, and the refrigerant flows from the medium introduction pipe 101 into the electronic expansion valve 100 , is throttled by the electronic expansion valve 100 to be decompressed, and is discharged from the medium outlet pipe 102 .

[0050] Furthermore, as shown in FIG. 6, a first protrusion 18 for attaching a medium lead-out pipe 102 is protrudingly provided at one end of the valve body 10 away from the sleeve 40, and the outlet 10b extends along the axis 103. The outlet 10b is communicated with the valve port 11, and in this embodiment, the medium lead-out pipe 102 is welded to the valve body.

[0051] Preferably, a connection groove 19 is formed at one end of the valve body 10 away from the sleeve 40, the first projection 18 is positioned at the bottom of the connection groove 19, and one end of the medium outlet tube 102 is connected to the first projection 18 , and is brought into contact with the bottom of the connecting groove 19 . Here, by providing the connecting groove 19, the welding between the medium lead-out pipe 102 and the valve body 10 can be facilitated, the outflow of solder can be prevented, and the welding quality can be improved.

[0052] The valve body 10 is provided with a guide sleeve 16 and a connecting hand 17. As shown in FIG. The guide sleeve 16 is mounted within the mounting chamber 14 and has an interference fit with the mounting chamber 14 . Here, the interference fit means that the value obtained by subtracting the size of the outer diameter of the guide sleeve 16 to be engaged from the size of the inner diameter of the mounting chamber 14 is a negative value. The guide sleeve 16 is used to guide the spindle assembly 20 to move along the axis 103 of the valve body 10 . The connecting hand 17 is mounted within the connecting chamber 15 and used to mount the screw assembly 30 . Preferably, the connecting arm 17 is attached within the connecting chamber 15 by welding.

[0053] Further, the valve body is provided with a first mounting step 10d. It is attached.

[0054] In one embodiment, the valve body 10 may be provided with a mounting seat 110, and the sleeve 40 is mounted on the mounting seat 110, as shown in FIGS. One end of the guide sleeve 16 is mounted within the mounting chamber 14 and is tightly fitted with the mounting chamber 14, the other end extends from within the mounting chamber 14 and is connected to the screw assembly 30, and the connecting hand 17 is attached to the mounting chamber 14. Attached to seat 110 .

[0055] Further, the mounting seat 110 has a substantially cylindrical shape, and the mounting seat 110 is welded to the valve body 10 by welding. Of course, in other embodiments, the mounting seat 110 may be connected to the valve body 10 in other ways. The sleeve 40 is welded to the mounting seat 110 by welding so as to be closely connected with the mounting seat 110. A mounting hole 111 is formed in the mounting seat 110, and a part of the screw assembly 30 extends into the mounting hole 111. , is connected to the guide sleeve 16 .

[0056] In this embodiment, by providing the mounting seat 110, the mounting seat 110 replaces part of the function of the valve body 10 and is used to mount the screw assembly 30 and the sleeve 40. The weight of the body 10 can be reduced, the degree of difficulty in processing the valve port 11 in the valve body is reduced, the processing accuracy of the valve body 10 and the valve port 11 is ensured, and the control accuracy of the flow rate of the electronic expansion valve 100 is improved. bottom.

[0057] Preferably, the valve body 10 is provided with a second mounting step 10e, and the mounting seat 110 is welded to the second mounting step 10e. The valve body 10 and the mounting seat 110 may adopt an integral structure or a separate structure. In this embodiment, the valve body 10 and the mounting seat 110 adopt a separate structure.

[0058] In one embodiment, as shown in Figs. 10 and 11, one end of the mounting chamber 14 remote from the valve port 11 has a position limiting portion 141 in the circumferential direction. The engaging portion 161 is engaged with the position limiting portion 141 and is used to achieve the positioning of the guide sleeve 16 along the direction of the axis 103, so that the guide sleeve 16 is subjected to high pressure of the fluid medium, It prevents noise from being loosened along the axis 103 due to factors such as high/low temperature.

Furthermore, the position limiting portion 141 has an annular shape, and the inner diameter of the position limiting portion 141 is smaller than the inner diameter of the attachment chamber 14 . Preferably, the cross section along the plane in which the axis X of the position limiting part 141 exists is trapezoidal or arcuate. One end of the position limiting portion 141 with a large inner diameter is provided close to the mounting chamber 14 , and one end of the position limiting portion 141 with a small inner diameter is provided away from the mounting chamber 14 .

The position limiting portion 141 has an inner side surface 141a and an outer side surface 141b for contacting the guide sleeve 16, which are provided facing each other. An included angle a is formed between the inner surface 141 a of the position limiting portion and the inner wall of the mounting chamber 14 . It will be appreciated that forming the included angle a between the inner surface 141a of the position limiting portion and the inner wall of the mounting chamber 14 corresponds to forming a shaft collar that limits the movement of the guide sleeve 16 along the X axis. want to be

[0061] Preferably, the range of included angle a is 120° ≤ a ≤ 160°. Accordingly, the guide sleeve 16 can be mounted in the mounting chamber 14 within this angular range, and the movement of the guide sleeve 16 along the X-axis direction can be restricted. Specifically, in this embodiment, the included angle a=160°.

The position limiting portion 141 may be integrated with the valve body 10 or may be provided separately from the valve body 10 . When the position limiting portion 141 and the valve body 10 are integrated, the processing and manufacturing of the valve body 10 are facilitated, and the manufacturing cost is reduced. If the position limiting portion 141 and the valve body 10 are separately provided, the guide sleeve 16 can be easily attached. The two types of installation methods of the position limiting part 141 and the valve body 10 described above each have advantages, and the specific installation method of the position limiting part 141 can be provided according to actual demand.

[0063] Of course, in other embodiments, the position limiter 141 can be provided as a stopper. At this time, the included angle between the stopper and the valve body 10 can be 90 degrees. The stopper has an annular shape and is mounted in the connecting chamber 15 with a locking member such as a bolt.

[0064] As shown in FIG. 14, the guide sleeve 16 is processed and manufactured from a brass material, that is, it is a brass guide sleeve, and the guide sleeve made of brass material is relatively soft. 10 can be easily attached to each other, and noise due to collision between the fluid medium and the guide sleeve 16 can be reduced. It is understood that in other embodiments the guide sleeve 16 may be fabricated from other materials than brass.

The guide sleeve 16 has a substantially cylindrical shape, the guide sleeve 16 and the valve port 11 are separated from each other, and the end surface of one end of the guide sleeve 16 near the valve port 11 is a flat surface 161 . Here, since the plane 161 is a smooth or smooth surface, that is, the coefficient of friction of the plane 161 is low, the fluid medium can flow along the plane 161 when passing through the plane 161, and the noise of the fluid can be reduced. further reduce.

[0066] The guide sleeve 16 has an axis Y, and along the axis Y, the guide sleeve 16 has a guide hole 16a and a spindle hole 16b. The diameter of the spindle hole 16b is smaller than the diameter of the guide hole 16a. The spindle hole 16b is positioned at the bottom of the guide hole 16a and communicates with the guide hole 16a.

[0067] Since the hole diameter of the spindle hole 16b is smaller than the hole diameter of the guide hole 16a, the bottom of the guide hole 16a and the spindle hole 16b are combined to form a position limiting step 161a, and the spindle assembly 20 is positioned within the guide hole 16a. and move under the guidance of guide hole 16a and spindle hole 16b.

[0068] Further, as shown in FIGS. 4 and 12, the guide sleeve 16 can have a three-stage structure. , a second cylindrical step 163 extending into the mounting hole 111 for engagement with the screw assembly 30, and a third cylindrical step 164 located within the valve chamber 12; 16 may have a two-stage structure.

[0069] The first cylindrical step 162 and the mounting chamber 14 are tightly fitted to ensure that the axis of the guide sleeve 16 and the axis Y of the valve body 10 are aligned in the mounting process of the guide sleeve 16. This ensures coaxiality between the guide sleeve 16 and the valve opening 11 .

[0070] Preferably, the first cylindrical stage 162 is a middle stage, ie located between the second cylindrical stage 163 and the third cylindrical stage 164, and the outer diameter of the first cylindrical stage 162 is equal to that of the second cylindrical stage. 163 is larger than the outer diameter of the third cylindrical step 164, respectively. A step 162a is formed between the first cylindrical step 162 and the second cylindrical step 163 and the third cylindrical step 164, and the step 162a between the first cylindrical step 162 and the second cylindrical step 163 is a mounting chamber. It should be understood that the second cylindrical step 163 is engaged with the first locating step 14a at the bottom of 14 to achieve the locating of the second cylindrical step 163.

[0071] Further, in one embodiment, the first cylindrical stage 162 has a first end 162b and a second end 162c that are provided in opposition, and the second cylindrical stage 163 is the second end of the first cylindrical stage. It is connected to end 162c. The end surface of the first end 162b of the first cylindrical step is the flat surface 161. As shown in FIG. Axis Y is perpendicular to plane 161 . Since the end surface of the first end 162b of the first cylindrical stage is a flat surface 161, the frictional force of the contact between the fluid medium and the second cylindrical stage 163 can be reduced, further reducing noise generation and improving user comfort. Improve the comfort of use.

[0072] Preferably, the end face of the first end 162b of the first cylindrical step abuts against the bottom of the mounting chamber 14 to achieve mounting of the guide sleeve 16. As shown in Figs. Additionally, the first end 162b of the first cylindrical stage has a guide structure 165 in the circumferential direction. Here, the installation of the guide sleeve 16 is facilitated by providing the guide structure 165 . In addition, one end of the second cylindrical step 163 remote from the first cylindrical step 162 also has a guiding structure 165a in the circumferential direction.

[0073] Specifically, the guiding structure 165 includes a guiding portion 165a provided at the second end 162c of the first cylindrical stage. Preferably, guide 165a is a fillet guide or conical guide. Of course, in other embodiments, the guide structure 165 may be other structures.

[0074] As shown in Fig. 15, in another embodiment, the structure of the guide sleeve 16 basically corresponds to the structure of the guide sleeve 16 in the previously described embodiments, and the first cylindrical stage of the first cylindrical stage A cam 166 is provided on the end surface of one end 162 b , and the end surface of the one end of the cam 166 away from the first cylindrical step is a flat surface 161 . The cam 166 extends into the through-hole 13, and the plane 161 abuts against the first positioning step 14a, thereby realizing the positioning and mounting of the guide sleeve 16.

[0075] As shown in Fig. 16, in yet another embodiment, the structure of the guide sleeve 16 basically matches the structure of the guide sleeve 16 in the previously described embodiments, and the A third cylindrical step 164 is provided at the first end 162 b , the third cylindrical step 164 and the valve port 11 are spaced apart, and one end of the third cylindrical step 164 away from the first cylindrical step 162 is a plane 161 . different in some respects. The outer diameter of the third cylindrical step 164 is smaller than the outer diameter of the second cylindrical step 163, and a step 162a is formed between the third cylindrical step 164 and the second cylindrical step 163 as well. A third cylindrical stage 164 extends from the through hole 13 into the valve chamber 12 . Preferably, the third cylindrical step 164 is stepped.

[0076] Further, the length of the second cylindrical step 163 is 1/4 to 1/3 times the length of the guide sleeve. Here, the length of the second cylindrical step 163 is 1/4 to 1/3 times the length of the guide sleeve. Therefore, the guide sleeve 16 can be engaged with the screw assembly 30 with a sufficient engagement size, which improves connection reliability and reduces the risk of the guide sleeve 16 loosening due to vibration or the like. It can be understood. Of course, by lengthening the third cylindrical step 164, the overall length of the guide hole 16a is increased and the spindle assembly 20 is mounted within the guide hole 16a to improve the overall coaxiality of the spindle assembly 20.

Preferably, the length of the second cylindrical step 163 is 3/10 times the length of the guide sleeve 16 . It will be appreciated that the length of the second cylindrical step 163 being approximately one-third the length of the guide sleeve 16 further improves the reliability of the connection between the second cylindrical step 163 and the screw assembly 30. .

[0078] One end of the third cylindrical stage 164 remote from the first cylindrical stage 162 also has guiding structure. Here, the installation of the guide sleeve 16 is facilitated by providing the guide structure. Specifically, the guiding structure is a structure such as a chamfer or tapered surface provided on the first cylindrical step 162 and the third cylindrical step 164 .

[0079] Further, the connecting hand 17 is welded to the valve body 10, and the valve body 10 is further provided with a mounting bracket 10c. The mounting bracket 10c is welded to the valve body 10, or welded to the valve body 10 and the mounting seat 110, respectively, and the mounting bracket 10c is engaged with an external device for electronic expansion. Installation of the valve 100 is realized.

[0080] Furthermore, as shown in FIG. Used for storage. Thus, during the installation process of the guide sleeve 16, debris on the valve body 10 and the guide sleeve 16 can be prevented from entering the electronic expansion valve 100 in the form of impurities and affecting the normal operation of the electronic expansion valve 100. .

[0081] In one embodiment, as shown in FIG. 9, the attachment chamber 14 has an inner wall, and the scrap storage structure 120 includes a first scrap storage groove 121 opened in the inner wall of the attachment chamber 14 in the circumferential direction. .

Preferably, a plurality of first debris storage grooves 121 may be provided, and the plurality of first debris storage grooves 121 are provided along the axis X of the valve body 10 on the inner wall of the mounting chamber 14 at intervals. be done. Each of the mouths of the first debris storage grooves 121 has a first debris guide structure 122 for guiding debris on the valve body 10 and guide sleeve 16 into the first debris storage grooves 121 .

Specifically, the first waste guide structure 122 includes a first waste guide portion 122a provided on the inner wall of the mounting chamber 14, and the first waste guide portion 122a is the groove mouth of the first waste storage groove 121. Located in Preferably, the first waste guide 122a is located in an inclined waste guide, fillet waste guide, or the like.

Further, the mounting chamber 14 has an opening 142 that is provided away from the valve port 11 . The first scrap storage groove 121 is provided on the inner wall of the mounting chamber 14 in proximity to the end of the opening 142 of the mounting chamber 14 . Therefore, subject to assembly requirements, the angle between the guide sleeve 16 and the engagement step at the end of the opening 142 of the mounting chamber 14 is made as small as possible to reduce debris extrusion.

[0085] In another embodiment, as shown in Figs. 12 and 13, the guide sleeve 16 has an outer wall, and the waste storage structure 120 is a second waste storage groove opened in the outer wall of the guide sleeve in the circumferential direction. 123 included.

Preferably, the second scrap storage groove 123 is provided on the outer wall of the first cylindrical stage 162 . Further, the second scrap storage groove 123 is provided adjacent the second end 162c of the first cylindrical step 162. As shown in FIG. That is, it can be seen that it is provided at the second end 162c of the first cylindrical step 162 as an interference fit step with the short mounting chamber 14 to reduce debris extrusion.

[0087] Further, a plurality of second scrap storage grooves 123 may be provided. A plurality of second debris storage grooves 123 are spaced along the axis Y of the guide sleeve 16 on the outer wall of the first cylindrical step 162 . Each of the mouths of the second debris storage grooves 123 has a second debris guide structure 124 to guide debris on the valve body 10 and the guide sleeve 16 into the second debris storage grooves 123 .

Specifically, the second scrap guide structure 124 includes a second scrap guide portion 124 a provided on the outer wall of the guide sleeve 16 , and the second scrap guide portion 124 a is the groove mouth of the second scrap storage groove 123 . Located in Preferably, the second scrap guide 124a is provided at an inclined scrap guide, a fillet scrap guide, or the like.

[0089] In still another embodiment, the mounting chamber 14 has an inner wall, the guide sleeve 16 has an outer wall, and the scrap storage structure 120 is the first scrap storage groove 121 in the first embodiment and the A second scrap storage groove 123 is included. The first scrap storage groove 121 on the inner wall of the mounting chamber 14 and the second scrap storage groove 123 on the outer wall of the guide sleeve 16 are offset along the axis 103 direction.

[0090] As shown in Figures 17, 18 and 19, in one embodiment, the spindle assembly 20 includes a spindle sleeve 21 mounted within the guide sleeve 16 and a spindle 22 mounted within the spindle sleeve 21. The spindle 22 has an axis, and the axis of the spindle 22 is provided so as to overlap the axis 103 of the valve body 10 . One end of the spindle 22 is connected to a screw assembly 30 and the other end is engaged with the valve port 11. The screw assembly 30 moves the spindle 22 to control the opening and closing of the valve port 11, thereby opening and closing the electronic expansion valve 100. Realize

[0091] The spindle assembly 20 further includes a first spring seat 23, a second spring seat 24, an elastic member 25 and a guide holder 26, wherein the first spring seat 23, the second spring seat 24 and the elastic member 25 form a spindle sleeve. 21, the first spring seat 23 is connected to the screw assembly 30 and contacts the guide holder 26, one end of the elastic member 25 contacts the first spring seat 23, and the other end contacts the second spring seat 23. Abutted against the spring seat 24 , a guide holder 26 is attached to one end of the spindle sleeve 21 away from the spindle 22 and abutted against the second spring seat 24 , and the guide holder 26 is engaged with the screw assembly 30 . used for

[0092] Further, the spindle assembly 20 further includes a ball 27, which is housed within the spindle sleeve 21, the ball 27 is provided between the spindle 22 and the screw assembly 30, and the spindle 22 and the screw assembly 30 By reducing the frictional contact surface area of the valve 100, wear of the spindle 22, screw assembly 30 is reduced, and reliability and stability of the electronic expansion valve 100 are improved.

[0093] Preferably, the ball 27 is provided between the second spring seat 24 and the spindle 22, and the ball 27 and the spindle 22 or the second spring seat 24 are welded by spot welding. 22 is provided with a groove 221, the ball 27 is mounted in the groove 221, and the ball 27 and the spindle 22 are welded by spot welding. Here, by providing the ball 27, the second spring seat 24 and the spindle 22 are in point contact, thereby reducing the area of the frictional contact surface between the second spring seat 24 and the spindle 22, thereby reducing the second spring seat. 24 and the spindle 22, and improve the reliability and stability of the electronic expansion valve 100.

[0094] As shown in Figures 19, 33 and 34, the screw assembly 30 includes a screw 31 and a nut sleeve 32, the screw 31 having a first end and a second end provided oppositely. , one end of the screw 31 is connected to the rotor assembly 50, the second end of the screw 31 is drilled through the nut sleeve 32 and is connected to the first spring seat 23, and the second end of the screw 31 and the nut sleeve 32 are connected to each other. , and one end of the nut sleeve 32 is attached to the connecting hand 17 .

[0095] Further, the nut sleeve 32 has a first end 32a and a second end 32b provided oppositely, the first end 32a of the nut sleeve being attached to the connecting hand 17 and the second end of the nut sleeve 32b is housed within the sleeve 40; An engagement step 321 extends from the first end 32 a of the nut sleeve and extends into the mounting hole 111 adjacent the first cylindrical step 162 .

[0096] Preferably, a locking groove 32c is provided in the first end 32b of the nut sleeve, a locking projection is provided in the locking groove 32c, and a connecting hole is formed in the connecting hand 17 correspondingly. , the first end 32b of the nut sleeve is mounted in the connecting hole to achieve a locking connection with the coupling hand 17 by means of a locking projection. When the screw 31 rotates under the drive of the rotor assembly 50, the nut-screw engagement relationship formed between the screw 31 and the nut sleeve 32 causes the screw 31 and the rotor assembly 50 etc. fixedly connected to the screw 31 to Moving along the axial direction of the screw 31 , the screw 31 thus provides for moving the spindle assembly 20 .

[0097] Further, an engagement hole 321a is formed in the engagement step 321, and the third cylindrical step 164 extends into the nut sleeve 32 from the engagement hole 321a and is fixedly connected to the nut sleeve 32. As shown in FIG. By providing the engagement step 321, the engagement length between the guide sleeve 16 and the nut sleeve 32 can be extended, and it is understood that the reliability of the connection between the guide sleeve 16 and the nut sleeve 32 is improved. .

[0098] Preferably, the fixed connection comprises a threaded connection, an interference fit or the like. In this embodiment, the interference fit between the third cylindrical step 164 and the nut sleeve 32 compensates the nut sleeve 32 by the third cylindrical step 164 so that the axis of the nut sleeve 32 is aligned with the axis of the guide sleeve 16 It is provided so as to overlap with the axis of the valve body 10 .

In this embodiment, the first cylindrical stage 162 and the mounting chamber 14 are tightly fitted, and the third cylindrical stage 164 and the nut sleeve 32 are tightly fitted, whereby the valve body 10 is is corrected, the nut sleeve 32 is corrected by the third cylindrical step 164, the three axes of the valve body 10, the guide sleeve 16 and the nut sleeve 32 overlap, and the three coaxials of the screw 31, the spindle 22 and the valve port 11 This reduces the collision between the spindle 22 and the valve body 10 during the moving process, further reduces the wear of members such as the spindle 22, and extends the service life of the electronic expansion valve 100. be.

[00100] A second positioning step 322 may be provided in the nut sleeve 32, and the third cylindrical step 164 extends into the nut sleeve 32 and abuts the second positioning step 322 to allow the guide sleeve 16 to move. It further improves the mounting reliability and avoids the axial movement of the guide sleeve 16 under the pressure of the fluid medium and the generation of noise.

[00101] As shown in Figures 20 and 21, in another embodiment, the basic structure of the spindle assembly 20 is essentially the same as the structure of the spindle assembly 20 described above, and the spindle assembly 20 includes a bearing 211 , a gasket 212 and an elastic member 213 , the bearing 211 and the gasket 212 are provided at one end of the screw assembly 30 near the spindle 22 , one end of the elastic member 213 contacts the gasket 212 and the other end contacts the spindle 22 . One end of the bearing 211 contacts the screw assembly 30 and the spindle sleeve 21, and the other end contacts the gasket 212. The gasket 212 is accommodated in the spindle sleeve 21 and contacts the outer ring of the bearing 211. different in

[00102] The screw 31 is provided with a second projection 311 extending along the radial direction of the screw 31. The second projection 311 is flush with the inner surface of the spindle sleeve 21, and the inner ring of the bearing 211 , and the inner surface of the spindle sleeve 21 abuts against the outer ring of the bearing 211 to restrict the position of the screw 31 and the spindle sleeve 21 with respect to the bearing 211 .

The screw 31 is fixedly connected to the inner race of the bearing 211 . In this embodiment, the screw 31 and the inner ring of the bearing 211 are fixed to each other by interference fit, that is, the size of the screw 31 is larger than the hole diameter of the inner ring of the bearing 211, and the screw 31 and the bearing 211 are relatively It has good connection stability.

[00104] It is understood that in other embodiments, the screw 31 and the inner ring of the bearing 211 may be secured together by other connection methods such as crimping, gluing, or the like.

[00105] The screw 31 rotates under the drive of the rotor assembly 50, and due to the fixed connection between the screw 31 and the inner ring of the bearing 211, the screw 31 moves the inner ring of the bearing 211 to rotate. The rotation of the screw 31 is released by rolling contact between the rolling elements in the bearing 211 and the outer ring of the bearing 211 . Since there are multiple rolling elements in the bearing 211, the release of rotation of the screw 31 changes from single-point rolling contact in the conventional electronic expansion valve 100 to multi-point rolling contact in this embodiment. The contact force is therefore shared by the multiple rolling elements, reducing the contact pressure at each contact point, and the rolling friction reduces the frictional force.

[00106] Furthermore, due to the coaxial mounting of the bearing 211 and the screw 31, the contact force at the rolling element is perpendicular to the gravitational direction of the screw 31, which also compares the contact force at the contact point in a conventional electronic expansion valve to relatively reduced, improving the stability and reliability of the electronic expansion valve 100 . At the same time, the bearing 211 has play so that the spindle 22 has a certain degree of freedom and can reduce the error due to the coaxiality between the spindle 22 and the valve port 11 .

[00107] In this embodiment, the elastic member 213 is a spring, and at this time, the elastic member 213 has relatively high connection stability. It is understood that in other embodiments, the elastic members 213 may be other types of elastic elements such as elastic posts.

[00108] With continued reference to Figures 4 and 17, the rotor assembly 50 includes a rotor 51 positioned within the sleeve 40 and an adapter plate 52 for mounting the screw 31, a position for limiting the angle of rotation of the rotor 51, and a The rotor 51 is attached to the adapter plate 52, and the adapter plate 52 and the screw 31 are fixedly connected by a method such as welding.

[00109] The position limiting member 53 includes a spring 531 put on the nut sleeve and a stop ring 532 attached to the guide piece 54. One end of the spring 531 is connected to the connecting hand 17, A stop portion 531 a is provided, and a stop ring 532 is wound around a spring 531 . Preferably, the outer wall of the nut sleeve 32 is provided with a stop shoulder 323 which is used to engage the stop ring 532 to limit the angle of rotation of the rotor 51 .

[00110] In one embodiment, in the process of rotor 51 rotating and moving along axis 103 to drive screw 31 and move spindle 22 to close valve port 11, stop ring 532 is pushed along spring 531. Moving, the stop ring 532 abuts against the stop shoulder 323 to limit the angle of rotation of the rotor 51 , which is the lower limit position of the rotor 51 . In the process in which the rotor 51 rotates and moves along the axis 103 to drive the screw 31 to move the spindle 22 to open the valve port 11, the stop ring 532 moves along the spring 531, and the stop ring 532 moves along the stop ring 532. It abuts against the portion 531 a to limit the rotation angle of the rotor 51 , and this is the upper limit position of the rotor 51 .

[00111] Further, the outer surface of the screw 31 extends outward along the radial direction of the screw 31 to form a cam 311, and the cam 311 on the screw 31 is brought into contact with the guide sleeve 26, whereby the electron expansion A lower limit position of the movement of rotor 51 and screw 31 in valve 100 is established.

[00112] The lower limit position of the electronic expansion valve 100 is determined by mutual contact between the screw 31 and the guide sleeve 26. The screw 31 is a long and straight rod member, and the impact generated by mechanical collision is reduced. Since the direction of the force coincides with the axial direction of the screw 31, not only is the generated vibration and noise relatively low, but also the vibration and noise generated by the impact force can be quickly consumed on a long and straight rod. , the noise generated when the electronic expansion valve 100 switches the moving state of the rotor assembly 50 due to the restriction of the lower limit position is relatively reduced.

[00113] In one embodiment, the upper limit position of the electronic expansion valve 100 is achieved by the abutment of the stop ring 532 and the stop portion 531a of the spring 531 against each other. The retaining ring 532 moves along the spring 531 in the process of the rotor 51 rotating and moving along the axis 103 to drive the screw 31 and move the spindle 22 to close the valve port 11 . The stop ring 532 abuts against the stop portion 531 a to limit the rotation angle of the rotor 51 , which is the upper limit position of the rotor 51 and screw 31 .

[00114] In another embodiment, in order to further reduce the noise generated when the rotor assembly 50 in the electronic expansion valve 100 switches between moving states, the upper limit position of the electronic expansion valve 100 is set to the spindle assembly 20 of the screw 31. is determined by the abutment of the sleeve 40 with the one end remote from the . By adjusting the sizes of the stop 531a of the spring 531 and the stop ring 532, the stop ring 532 does not come into contact with the stop 531a of the spring 531 when the sleeve 40 and the screw 31 are brought into contact, and this Thus, the contact between the screw 31 and the sleeve 40 is the upper limit position of the electronic expansion valve 100 .

[00115] At this time, the upper limit position of the electronic expansion valve 100 is still determined by the screw 31, and the screw 31 is a long and straight rod member, and the direction of the impact force generated by the mechanical collision is The axial direction of the screw 31 is the same, and the vibration and noise generated by the impact force are relatively low. Due to the limitation of the upper limit position, the noise generated by switching the moving state of the rotor assembly 50 is relatively reduced.

[00116] Further, one end of the screw 31 near the sleeve 40 is curved so as to match the shape of the inner surface of the sleeve 40. At this time, the screw 31 and the sleeve 40 have relatively good connection performance.

[00117] In yet another embodiment, the upper limit position of the electronic expansion valve 100 can also be realized by mutual abutment of the guide holder 26 and the nut sleeve 32, the nut sleeve 32 being abutted against the guide holder 26 and the guide Since the holder 26 is fixedly connected to the screw 31 , the abutment of the nut sleeve 32 against the guide holder 26 can realize a restriction against further separation of the screw 31 from the valve opening 11 . At this time, by setting the length of the screw 31, when the nut sleeve 32 and the guide holder 26 are brought into contact with each other, the screw 31 and the sleeve 40 are prevented from coming into contact with each other. is determined by the contact between the nut sleeve 32 and the guide holder 26 .

[00118] The nut sleeve 32 is a swivel member with a large volume, so noise due to impact force generated by mechanical collision is relatively small, and vibration generated on the nut sleeve 32 and noise due to vibration can be consumed quickly. Therefore, the noise generated when the electronic expansion valve 100 switches the moving state of the rotor assembly 50 due to the limitation of the upper limit position is relatively reduced.

[00119] When the upper limit position of the electronic expansion valve 100 is not realized by mutual contact between the stop ring 532 and the stop portion 531a of the spring 531, that is, when the electronic expansion valve 100 adopts the above-described embodiment, the stop It is understood that ring 532 and spring 531 may be omitted. The structure of the electronic expansion valve 100 without the stop ring 532, the guide piece 54 and the spring 531 is shown in FIGS. 18 and 19. FIG.

[00120] It is understood that the rotor assembly 50 and the screw assembly 30 move together and that the upper and lower limits of movement of the rotor assembly 50, i.e., the upper and lower limits of movement of the screw assembly 30, are not distinguished herein. be.

[00121] It should be noted that the lower limit position referred to herein refers to the maximum operating position in which the screw 31 moves toward the valve port 11, and this operating position is referred to as the lower limit position and the upper limit position referred to herein. The position refers to the maximum working position at which the screw 31 moves away from the valve orifice 11, and this working position is called the upper limit position. "Upper" and "lower" in the upper limit position and lower limit position do not have the concept of orientation, and are added for convenience of explanation.

[00122] A stator assembly (not shown) includes members such as coils, and is used to generate a magnetic field when energized. achieve rotation.

[00123] In this embodiment, the electronic expansion valve 100 is a motorized electronic expansion valve, the rotor 51 is a motor rotor made of a permanent magnet in the stepping motor, the stator assembly is the motor stator in the stepping motor, and the stepping motor receives the logic digital signal provided by the control circuit, and then transmits the signal to each phase coil of the motor stator, the motor rotor, which is made of permanent magnets, is subjected to the magnetic moment to produce rotational movement, This provides a course of motion in which the stator assembly drives the rotor assembly to rotate.

[00124] The electronic expansion valve 100 of the present application employs an integral valve seat, and the spool valve seat and sleeve holder of a conventional electronic expansion valve are integrated using the integral valve seat. To reduce the number of times the valve 100 is assembled in the axial direction, that is, to reduce the possibility of deterioration of the coaxiality of each part of the electronic expansion valve 100 due to multiple assembly times, and to reduce the coaxiality between the parts of the electronic expansion valve 100. Furthermore, the number of parts is reduced, the opening performance of the electronic expansion valve 100 can be guaranteed, the installation is more convenient, and the reliability and stability of the whole product are improved.

[00125] Further, as shown in FIG. 7, the valve port 11 is provided coaxially with the valve body 10. The other end facing the first end 104 is called a second end 105 , and the valve opening 11 is opened by cutting along the direction from the second end 105 toward the first end 104 . Since the processing method of cutting from the upper end is adopted, the valve opening of the valve body 10 only needs to be tightened once during processing, which reduces the number of times of tightening in the manufacturing process of the valve opening 11 of the valve body 10. That is, the positioning error during machining of the valve opening 11 of the valve body 10 is reduced, and the coaxiality between the valve opening 11 and the valve body 10 is improved.

[00126] In addition, since the valve opening 11 is directly opened in the valve body 10, compared with the conventional electronic expansion valve, the valve seat core having the valve opening and the valve body need to be fixed by welding less, and the number of welding times is reduced. A reduction in .DELTA.

[00127] A first chamfer 106 is provided at one end of the valve port 11 near the second end 105 of the valve body 10, and the opening of the first chamfer 106 allows the portion of the valve port 11 near the second end 105 of the valve body 10 to be cut. The opening structure is formed in the valve port 11 of the spindle 22 to improve the sealing performance, reduce the internal leakage of the electronic expansion valve 100, and improve the control accuracy of the fluid flow rate of the electronic expansion valve 100. bottom.

[00128] A second chamfer 107 is provided at one end of the valve orifice 11 away from the second end 105 of the valve body 10, and due to the opening of the first chamfer 106 and the second chamfer 107, a The burrs are removed and the fluid medium has smoother flow characteristics as it passes through the valve port 11 .

[00129] Preferably, both the first chamfer 106 and the second chamfer 107 are less than 0.1 mm.

[00130] Furthermore, the thickness of the wall where the valve body 10 and the guide sleeve 16 contact is between 30% and 80% of the radius of the valve body 10 to further isolate noise. The thickness of the wall where the valve body 10 and the guide sleeve 16 are in contact is 30% to 80% of the radius of the valve body 10, which provides good noise isolation and prevents the flow noise of the fluid medium from entering the valve body 10. can be contained. If the wall thickness of the valve body 10 is too small, the noise containment effect will be relatively low, and if the wall thickness of the valve body 10 is too large, a member such as the spindle assembly 20 will be secured within the valve body 10. It is disadvantageous to install

[00131] Preferably, the thickness of the wall where the valve body 10 and the guide sleeve 16 meet is 80% of the radius of the valve body 10.

[00132] As shown in FIG. 22, noise generated during the use of the electronic expansion valve 100 is reduced, and turbulence noise caused by flow instability is reduced when the fluid medium passes through the valve port 11. To do this, a noise reduction module 60 is installed between the medium lead-out pipe 102 and the valve body 10, the noise reduction module 60 is used to improve the stability of the fluid medium flowing through the valve opening 11, This reduces turbulence noise during use of the electronic expansion valve 100 .

[00133] As shown in FIG. One end of the noise reduction module 60 extends outward along a direction perpendicular to the central axis of the valve body 10 to form a third protrusion 61, the medium lead-out pipe 102 covers a part of the noise reduction module 60, Also, it abuts on the third projection 61 . One end of the noise reduction module 60 is in contact with the valve body 10 and the other end is in contact with the medium lead-out pipe 102 . It is sandwiched between and fixed to the outlet tube 102 .

[00134] In other embodiments, the noise reduction module 60 may be fixed between the valve body 10 and the media outlet tube 102 using other structures, for example, the medium outlet tube 102 may be the noise reduction module It is understood that the other end remote from the valve port 11 of 60 may be directly abutted, at which time the third protrusion 61 formed on the noise reduction module 60 may be omitted.

A noise reduction hole 62 is formed in the noise reduction module 60 , the noise reduction hole 62 is connected to the terminal end of the valve port 11 , and the hole diameter of the noise reduction hole 62 communicating with the valve port 11 matches the hole diameter of the valve port 11 . to allow the fluid medium to flow smoothly as it passes through the valve orifice 11 and into the noise reduction holes 62, and to allow the fluid medium to flow turbulently as it passes through the valve orifices 11 and into the noise reduction holes 62. to avoid occurring.

[00136] In this embodiment, the noise reduction hole 62 is provided coaxially with the valve port 11. As shown in FIG.

[00137] Referring also to FIG.

[00138] In this embodiment, the noise reduction hole 62 is a three-stage step hole, and the noise reduction hole 62 includes a first hole 621, a second hole 622 and a third hole 623, and the first hole 621 is a valve A first hole 621, a second hole 622 and a third hole 623 are axially penetrated through each other, and the second hole 622 is located between the first hole 621 and the third hole 623. , the diameter of the third hole 623 is larger than that of the second hole 622 , and the diameter of the second hole 622 is larger than that of the first hole 621 .

[00139] In this embodiment, the first hole 621, the second hole 622, and the The three holes 623 are circular holes having symmetry and are provided coaxially.

[00140] Of course, the center A gap may be formed between the axes, and the first hole 621, the second hole 622, and the third hole 623 may adopt the shape of an irregular hole.

[00141] In other embodiments, the noise reduction holes 62 may adopt a structure with two stages, four stages, and more than four stages, and the noise reduction holes 62 gradually increase along the direction away from the valve port 11. It is understood that it is sufficient to be able to form an expanding stepped hole.

[00142] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be described below.

[00143] The noise reduction hole 62 is a stepped hole. The flow velocity after entering the less, which reduces noise during use of the electronic expansion valve 100 .

[00144] Referring also to FIG. 25, in another embodiment, the noise reduction hole 62 is a horn hole, and the noise reduction hole 62 is a cylindrical hole 621a communicating with the valve port 11 and a tapered hole 621a communicating with the cylindrical hole 621a. A tapered hole 622a is connected to one end of a cylindrical hole 621a and gradually expands in a direction away from the valve port 11. As shown in FIG. The size of the hole diameter of the cylindrical hole 621 a matches the size of the hole diameter of the valve port 11 .

[00145] The tapered hole 622a may be directly connected to the valve port 11, that is, the size of the hole diameter at one end of the tapered hole 622a facing the valve port 11 may match the size of the hole diameter of the valve port 11. Well, at this time, it is understood that the cylindrical hole 621 may be omitted.

[00146] The opening of the cylindrical hole 621a corresponds to increasing the length of the valve port 11, thus further improving the stability of the fluid medium.

[00147] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be described below.

[00148] The noise reduction hole 62 is a horn hole. The later flow velocity is reduced and the fluid medium suppresses the generation of free shear surfaces by means of gradually expanding noise reducing pores, resulting in better stability of the fluid medium and less turbulent flow noise. Therefore, the noise generated during the use of the electronic expansion valve 100 is reduced.

[00149] Referring also to FIG. 26, in still another embodiment, the noise reduction hole 62 is a straight hole, and the noise reduction hole 62 penetrates both end surfaces of the noise reduction module 60 and is connected to the valve port 11 to reduce the noise. The hole diameter of the reduction hole 62 matches the hole diameter of the valve port 11 .

[00150] The principle by which the noise reduction module 60 in this embodiment reduces the flow noise of the fluid medium will be described below.

[00151] The noise reduction hole 62 is a relatively long straight hole, and the noise reduction hole 62 corresponds to extending the length of the valve opening 11, which is the inlet end of the valve opening 11 and the noise reduction hole 62 reduces the velocity and pressure gradients of the fluid medium flowing through the end of the valve, resulting in improved stability of the fluid medium and reduced noise generated during use of the electronic expansion valve 100 .

[00152] Further, the noise reduction module 60 is modularized and fixed in the valve body 10, and the noise reduction module is provided separately from the valve body 10, because the shape on the electronic expansion valve 100 is already relatively large. The electronic expansion valve 100 can adopt a combination of a standardized valve body 10 and a customized noise reduction module without the need to open a complex shaped valve port 11 that is more difficult to process in the complicated valve body 10. Thus, further standardization of the components of the electronic expansion valve 100 is realized.

[00153] As shown in Figures 27 and 28, a weld ring 108 is further provided at one end of the medium outlet tube 102 in contact with the valve body 10, and two adjacent sides of the weld ring 108 face the valve body 10 and the valve body 10, respectively. In contact with the medium outlet tube 102 , the weld ring 108 is used to fill the weld bead 109 between the valve body 10 and the medium outlet tube 102 . The weld ring 108 is melted by the high temperature heating of the external welding device and flows as a molten filling material into the weld bead 109 formed between the valve body 10 and the medium lead-out pipe 102, thereby allowing the valve body 10 and the medium to flow. A welding fixation to the outlet tube 102 is realized.

[00154] Further, the electronic expansion valve 100 is further provided with a welded structure 70, which extends along a direction perpendicular to the axis 103 of the valve body 10 at one end of the valve body 10 near the medium lead-out pipe 102. A fourth protrusion 71 is formed, the medium outlet tube 102 is in contact with the fourth protrusion 71, and the contact surface between the medium outlet tube 102 and the fourth protrusion 71 is between the valve body 10 and the medium outlet tube 102. is a weld bead 109 that needs to be filled with welding material.

[00155] By providing the fourth projection 71 on the valve body 10, the position where the weld bead 109 is formed is provided in the direction away from the contact end face of the weld ring 108 and the valve body 10, thereby making the weld ring 108 The center can be flush with the weld bead 109, and the flush between the center of the weld ring 108 and the weld bead 109 allows the weld ring 108 to flow smoothly into the weld bead 109 during welding, Solder creeping and solder drop phenomenon are avoided.

[00156] The welded structure 70 further includes a convex side 72 provided on the medium outlet pipe 102, and the medium outlet pipe 102 extends from the fourth projection 71 along the direction of the axis 103 of the valve body 10 to form the convex side 72. That is, the thickness of the medium lead-out tube 102 is greater than the radial length of the fourth protrusion 71, and the weld ring 108 enters the weld bead 109 along the convex side 72 in a molten state during welding. As a result, the welding quality between the valve body 10 and the medium lead-out pipe 102 was further improved.

The welded structure 70 further includes a third chamfer 73 provided on the end face where the medium outlet pipe 102 and the valve body 10 contact, and the third chamfer 73 is formed on the convex side 72 and the outer surface of the medium outlet pipe 102. , and the weld ring 108 contacts the valve body 10 via the third chamfer 73 . By opening the third chamfer 73 , the valve body 10 and the medium lead-out pipe 102 form a housing space 74 for housing the welding ring 108 . and the medium lead-out tube 102, and the weld ring 108 can also enter the weld bead 109 more easily during welding.

[00158] In the electronic expansion valve 100, the welding structure 70 is provided on the valve body 10 and the medium lead-out pipe 102, so that the center of the welding ring 108 is flush with the welding bead 109, and the welding ring 108 is in a molten state during welding. The fluid smoothly flowed into the weld bead 109, and the quality of the weld formation between the valve body 10 and the medium lead-out pipe 102 was improved, and the reliability and stability of the electronic expansion valve 100 were improved.

[00159] As shown in FIG. , this can not only avoid the impact of the fluid medium on the guide sleeve 16 and reduce noise, but at the same time, when the pressure of the medium at the inlet 10a changes, the pressure equalization passage 80 will open the electronic expansion valve 100 to quickly equalize the internal pressure and the inlet pressure of the electronic expansion valve 100, avoid the phenomenon of excessive load on the inside of the electronic expansion valve 100, and improve the operational stability of the electronic expansion valve 100.

[00160] In one embodiment, a pressure equalization passage 80 is provided between the guide sleeve 16 and the valve body 10, and the pressure equalization passage 80 communicates the interior of the guide sleeve 16 and the valve body 10 with each other. to equalize the pressure of the fluid medium at the inlet 10 a and the pressure of the fluid medium inside the guide sleeve 16 .

[00161] Further, as shown in FIG. 12, a pressure equalization passage 80 is opened in the guide sleeve 16, and the pressure equalization passage 80 communicates between the valve chamber 12 and the guide hole 16a. 16a, so that when the valve port 11 is opened, the fluid medium enters the valve chamber 12 and at the same time some fluid medium passes through the pressure equalization passage 80 into the guide hole 16a. to equalize the pressure between the guide hole 16a and the valve chamber 11, which can not only avoid the impact of the fluid medium on the guide sleeve 16 and reduce noise, but also change the pressure of the system at the same time. At this time, the internal pressure of the electronic expansion valve 100 can be quickly equalized, the extra load caused by the pressure difference can be avoided, and the operation stability of the electronic expansion valve 100 can be improved.

In this embodiment, the pressure equalization passage 80 equalizes the pressure between the valve chamber 12 and the guide hole 16 a , that is, the valve chamber 12 and other valve chambers 12 inside the electronic expansion valve 100 . By equalizing the pressures of the parts, the entire inside of the electronic expansion valve 100 is brought into a state of equalized pressure, thereby avoiding the phenomenon that the inside of the electronic expansion valve 100 is subjected to an excessive load.

[00163] Preferably, the pressure equalization passage 80 includes at least one pressure equalization hole 80a, and the pressure equalization hole 80a communicates the valve chamber 12 and the guide hole 16a with each other. Thereby, some fluid medium passes through the pressure equalization hole 80a and enters the guide hole 16a to achieve the purpose of pressure equalization.

[00164] The pressure equalization hole 80a has an axis, and the axis of the pressure equalization hole 80a is provided parallel to the axis X. That is, the pressure equalization hole 80a is opened perpendicular to the guide sleeve 16, so that the pressure equalization hole 80a does not affect the flow direction of the fluid medium, and the noise caused by the change of the flow direction of the fluid medium is eliminated. It is understood to exclude the

[00165] Further, the number of pressure equalization holes 80a is two, and the two pressure equalization holes 80a are evenly distributed in the guide sleeve 16 along the circumferential direction of the axis X. Of course, in this embodiment, the number of pressure equalization holes 80a may be three, four, etc., and the specific number of pressure equalization holes 80a may be set according to actual needs.

[00166] Preferably, each of the pressure equalization holes 80a is a circular pressure equalization hole. Of course, in other embodiments, pressure equalization holes 80a may have other shapes. For example, pressure equalization hole 80a is a rectangular or polygonal pressure equalization hole.

[00167] In another embodiment, as shown in Figures 4, 30-34, a pressure equalization passage 80 is provided between the mounting seat 110, the guide sleeve 16 and the nut sleeve 32, and is provided between the inlet 10a and the guide. The interior of the sleeve 16, the interior of the mounting seat 110, the interior of the nut sleeve 32, and the interior of the sleeve 40 are communicated with each other so that the pressure of the fluid medium at the inlet 10a and the interior of the guide sleeve 16, the interior of the mounting seat 110, the nut It is used to equalize the pressure of the fluid medium inside the sleeve 32 and inside the sleeve 40 .

[00168] The pressure equalization passage 80 includes a first equalization passage 81 and a second equalization passage 82, the first equalization passage 81 being the interior of the inlet 10a and the guide sleeve 16, the interior of the screw assembly 30 and the sleeve. The second equalizing passage 82 is provided for communicating the inside of the mounting seat 110 and the first equalizing passage 81, thereby forming the first equalizing passage. 81 and the second equalizing passage 82 allow the interior of the guide sleeve 16, the interior of the mounting seat 110, the interior of the nut sleeve 32 and the interior of the sleeve 40 to communicate with the entrance. As the fluid medium enters through the inlet 10a, some fluid medium passes through the first equalization passage 81 into the interior of the guide sleeve 16, the interior of the screw assembly 30 and the interior of the sleeve 40 and into the second equalization passage. It passes through 82 and enters the interior of the mounting seat 110 to equalize the medium pressure everywhere inside the electronic expansion valve 100 .

[00169] The first equalization passage 81 includes a first equalization hole 811 and a second equalization hole 812, and the first equalization hole 811 is opened in the guide sleeve 16 so that the inside of the guide sleeve and the valve chamber 12 are separated. The second equalization hole 812 is formed in the nut sleeve 32 and used to communicate the inside of the sleeve 40 and the inside of the nut sleeve 32, thereby allowing the valve chamber 12 and the The inside of the guide sleeve 16, the inside of the nut sleeve 32 and the inside of the sleeve 40 are communicated with each other to achieve the purpose of pressure equalization.

Further, the first equalization hole 811 has an axis, and the axis of the first equalization hole 811 is provided parallel to the axis 103 . That is, the first equalization hole 811 is opened perpendicularly to the guide sleeve 16, so that the first equalization hole 811 does not affect the flow direction of the fluid medium, and the flow direction of the fluid medium is changed. It is understood to eliminate the noise that

[00171] Preferably, the number of the first equalization holes 811 is two, and the two first equalization holes 811 are evenly distributed in the guide sleeve 16 along the circumferential direction of the axis 103. Of course, in this embodiment, the number of the first equalization holes 811 may be three, four, etc., and the specific number of the first equalization holes 811 may be set according to actual needs.

[00172] Each of the first equalization holes 811 is a circular pressure equalization hole. In other embodiments, the first equalization holes 811 may have other shapes. For example, rectangular, polygonal pressure equalization holes.

The second equalization hole 812 has an axis, and the axis of the second equalization hole 812 is provided perpendicular to the axis of the first equalization hole 811 . Of course, in other embodiments, the axis of the second equalization hole 812 may not be perpendicular to the axis of the first equalization hole 811 .

[00174] The second equalization passage 82 includes a third equalization hole 821, the third equalization hole 821 is opened in the connecting arm 17, and the third equalization hole 821 is located between the inside of the mounting seat 110 and the bush 40. At the same time, the third equalization hole 821 is also used for mounting the spring 531 . One end of the spring 531 extends into the third equalization hole 821 . The inside of the mounting seat 110 and the first equalization passage 81 are communicated by the third equalization hole 821 , and the fluid medium at the inlet 10 a passes through the first equalization passage 81 and the third equalization hole 821 . It is understood to go inside the seat 110 .

[00175] Preferably, the third equalization hole 821 is a slot hole, and the third equalization hole 821 is provided open along a direction perpendicular to the axis of the valve body. The number of third equalization holes 821 is plural. In this embodiment, the number of the third equalization holes 821 is two, and the two third equalization holes 821 are provided symmetrically with respect to the axis of the valve body.

[00176] As shown in Figures 2 and 3, the second equalization passage 82 may further include a fourth equalization hole 822 and a fifth equalization hole 823, wherein the fourth equalization hole 822 is a guide sleeve. 16, a fifth equalizing hole 823 is opened in the nut sleeve 32, the fourth equalizing hole 822 communicates with the fifth equalizing hole 823, so that the fourth equalizing hole 822, the fifth equalizing The hole 823 communicates the inside of the guide sleeve 16 and the inside of the mounting seat 110 . Here, by further providing the fourth equalization hole 822 and the fifth equalization hole 823, the equalization speed of the medium pressure between the inside of the mounting seat 110 and the inlet 10a can be increased.

Further, a fourth equalization hole 822 is opened in the second cylindrical step 163 and a fifth equalization hole 823 is opened in the engagement step 321, and the fourth equalization hole 822 and the fifth equalization hole 823 Communication between the mounting hole 111 and the guide hole 16a is achieved, thereby further realizing communication between the inside of the mounting seat 110 and the first equalizing passage 81.

[00178] The fourth equalization hole 822 has an axis, the fifth equalization hole 823 has an axis, and the axis of the fourth equalization hole 822 is provided so as to overlap the axis of the fifth equalization hole 823. , the axis of the fourth equalizing hole 822 is set perpendicular to the axis of the first equalizing hole 811 . Of course, in other embodiments, the axis of the fourth equalization hole 822 does not have to overlap the axis of the fifth equalization hole 823, and the fourth equalization hole 822 and the fifth equalization hole 823 do not have to overlap each other. The axis of the fourth equalizing hole 822 need not be perpendicular to the axis of the first equalizing hole 811 as long as the communication can be realized.

[00179] The technical features of the embodiments described above can be combined arbitrarily. However, as long as there is no contradiction in the combination of these technical features, any of them should be considered within the scope described herein.

[00180] The foregoing examples are merely illustrative of some embodiments of the present invention, the description of which is more specific and detailed, but which limits the scope of the claims of the invention. should not be understood as It should be pointed out that for those skilled in the art, several variations and improvements are possible without departing from the spirit of the present invention, and all fall within the protection scope of the present invention. Therefore, the patent protection scope of the present invention shall be subject to the appended claims.

Claims (24)

An electronic expansion valve including a valve body, a spindle assembly, a screw assembly, a rotor assembly, a stator assembly and a sleeve,
The screw assembly includes a screw having one end connected to the rotor assembly and the other end connected to the spindle assembly, and a position limiting member in which the screw is rotatably inserted to limit rotation of the rotor assembly. a nut sleeve having a circumference provided with
the stator assembly acting on the rotor assembly to drive rotation of the rotor assembly, rotation of the rotor assembly moving the screw assembly;
a valve opening is formed in the valve body, and the spindle assembly is driven by the screw assembly to open and close the valve opening;
The sleeve is provided to cover one end of the valve body remote from the valve opening,
A guide sleeve is provided inside the valve body for guiding the vertical movement of the spindle assembly,
The spindle assembly is provided within the guide sleeve and includes a spindle sleeve including a bearing connected to the screw, and a spindle for opening and closing the valve port,
the guide sleeve includes an upper cylindrical stage and a middle cylindrical stage that guide the vertical movement of the spindle sleeve, and a lower cylindrical stage that guides the vertical movement of the spindle;
The upper cylindrical step of the guide sleeve is secured to the nut sleeve by an interference fit, and the middle cylindrical step is secured to the valve by an interference fit, such that the nut sleeve and the valve body are coaxially secured to the guide sleeve. fixed to the body
An electronic expansion valve, wherein the lower cylindrical stage extends into a valve chamber through which a fluid medium flows in the valve body. A medium lead-out pipe is connected to the valve body, and the fluid medium flows into the medium lead-out pipe after passing through the valve port, passes through the medium lead-out pipe, and is discharged to the outside. A noise reduction module is provided between the body, a noise reduction hole is opened in the noise reduction module, the noise reduction hole is connected to the valve opening, and one end of the noise reduction hole connected to the valve opening has a hole diameter of the above 2. The electronic expansion valve of claim 1, matching the pore size of the valve orifice. the noise reduction hole is a multistage stepped hole, and the stepped hole expands gradually along a direction away from the valve opening; or
the noise reduction hole comprises a tapered hole, the tapered hole gradually expanding in a direction away from the valve port; or
3. The electronic expansion valve according to claim 2, wherein said noise reduction hole is a straight hole, and said straight hole penetrates both end surfaces of said noise reduction module. The valve body is provided with a welding ring and a first projection,
the weld ring is in contact with the medium outlet tube;
The first projection is located at one end close to the medium lead-out pipe of the valve body,
3. The electronic expansion valve according to claim 2, wherein a weld bead is formed between the first projection and the medium lead-out tube, and the center of the weld ring is flush with the weld bead. the spindle assembly includes an elastic member and a gasket, one end of the spindle abuts the elastic member and the other end is used to engage the valve port, the bearing has an outer ring and an inner ring; 2. The electronic expansion valve according to claim 1, wherein the inner ring of the bearing is fixedly connected to the screw, one end of the gasket is in contact with the outer ring of the bearing, and the other end is in contact with the elastic member. One end of the valve body where the valve opening is opened is called a first end, one end facing the first end of the valve body is called a second end, and the valve opening extends from the second end. 2. The electronic expansion valve according to claim 1, which is cut open in a direction toward said first end. 7. The electronic expansion valve according to claim 6, wherein a first chamfer is provided on an end face of the valve port near the second end, and a second chamfer is provided on an end face of the valve port remote from the second end. . 7. The electronic expansion valve according to claim 6, wherein the thickness of the wall where the valve body and the guide sleeve contact is 30% to 80% of the radius of the valve body. the electronic expansion valve further includes a pressure equalization passage, an inlet being opened to allow a fluid medium to flow into the valve body, the pressure equalization passage communicating the inlet and the interior of the electronic expansion valve; 2. The electronic expansion valve of claim 1, equalizing the pressure of the fluid medium at the inlet and the pressure of the fluid medium inside the electronic expansion valve. A mounting seat is provided on the valve body, the mounting seat is mounted on the valve body, the sleeve is mounted on the mounting seat, and the pressure equalization passage extends through the inlet and the guide sleeve and the mounting seat. , the interior of the screw assembly and the interior of the sleeve are communicated with each other, the pressure of the fluid medium at the inlet and the interior of the guide sleeve, the interior of the mounting seat, the interior of the screw assembly and the sleeve 10. The electronic expansion valve of claim 9, which equalizes the pressure of the fluid medium therein. The pressure equalization passage includes a first equalization passage and a second equalization passage, the first equalization passage connecting the inlet to the interior of the guide sleeve, the interior of the screw assembly and the interior of the sleeve. 11. The electronic expansion valve according to claim 10, wherein the second equalization passage communicates the inside of the mounting seat and the first equalization passage. The valve body is further provided with a mounting chamber that communicates with the valve port, and the guide sleeve is mounted in the mounting chamber and tightly fitted with the mounting chamber, and debris is accumulated between the valve body and the guide sleeve. 2. The electronic expansion valve of claim 1, wherein a structure is provided, said debris retention structure being used to retain debris between said valve body and said guide sleeve. 2. The electronic expansion valve of claim 1, wherein the lower cylindrical step is stepped. The guide sleeve is provided with a guide hole, a spindle hole and a pressure equalization hole,
The spindle hole and the pressure equalization hole are provided at the bottom of the guide hole,
2. The electronic expansion valve of claim 1, wherein the axis of the guide hole overlaps the axis of the spindle hole, and the axis of the pressure equalizing hole is parallel to the axis of the spindle hole. In the spindle assembly, the spindle sleeve is mounted in the guide hole, one end of the spindle is provided in the spindle sleeve, and the other end is provided in the spindle hole to engage with the valve port. 15. The electronic expansion valve of claim 14. 2. The sleeve according to claim 1, wherein one end of the valve body remote from the valve port contracts in the axial direction of the valve body to form a first mounting step, and the sleeve abuts against the first mounting step. Electronic expansion valve as described. 17. The electronic expansion valve according to claim 16 , wherein the sleeve and the valve body are fixed together by a welded connection, and the first mounting step is a weld fixing surface between the sleeve and the valve body. 2. The electronic expansion valve according to claim 1, wherein a mounting chamber is provided in said valve body to accommodate said guide sleeve, and said guide sleeve and said mounting chamber are tightly fitted. 2. The electronic expansion valve of claim 1, wherein said valve body, said spindle assembly, said screw assembly, said rotor assembly and said sleeve are coaxially mounted. The noise reduction hole includes a first hole, a second hole and a third hole, the first hole is connected to the valve port, and the first hole, the second hole and the third hole extend along the axial direction. The second hole is formed between the first hole and the third hole, the diameter of the third hole is larger than the diameter of the second hole, and the diameter of the second hole is the same as the diameter of the second hole. 4. The electronic expansion valve of claim 3, which is larger than the hole diameter of the first hole. 21. The electronic expansion valve according to claim 20, wherein said first hole, second hole and third hole are all circular holes and provided coaxially. The noise reduction hole further includes a cylindrical hole that communicates with the tapered hole, and the cylindrical hole is provided coaxially with the tapered hole and communicates with the valve port. 4. The electronic expansion valve according to claim 3, wherein is equal to the hole diameter of the valve port. 3. The electronic expansion valve according to claim 2, wherein said medium lead-out pipe and said valve body are fixedly connected to each other by welding. An air conditioning system comprising an electronic expansion valve according to any one of claims 1-23.

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