JP7409982B2 - Electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electric valve and a refrigeration cycle system.

Conventionally, electric valves have been proposed in which the opening degree of a main valve port can be changed by a main valve element, and the opening degree of a sub-valve port provided on the main valve element can be changed by a sub-valve element (for example, (See Patent Document 1). In the electric valve described in Patent Document 1, the main valve body includes a main valve part, a holding part having a cylindrical needle guide hole, and a sub-valve seat, and a part below the needle guide hole. is the sub-valve chamber. In addition, by forming a communication hole on the side surface of the holding part, when the sub-valve body opens the sub-valve port, the main valve chamber, the sub-valve chamber, the sub-valve port, and the main valve port are electrically connected. It looks like this.

JP2020-034141A

In the electric valve described in Patent Document 1, a joint is connected to a side surface and one end in the axial direction of a cylindrical valve housing having a main valve chamber. When the joint on the side is the primary side, when the sub-valve port is open as described above, the fluid flowing from this joint passes through the communication hole on the side of the holding part, and then flows through the sub-valve port and the main valve port. It flows out from the joint on one end. At this time, if the main valve body is rotatably provided, the positional relationship between the joint on the side surface and the through hole may change, and the flow rate of the fluid passing through the sub-valve port may change over time. In addition, even if the main valve body does not rotate, the flow rate of fluid passing through the communication hole on the side of the holding part differs depending on the position near and far from the joint on the side, and the flow rate of fluid passing through the sub-valve port. could be uneven depending on location. In this way, the flow rate of the fluid passing through the sub-valve port becomes unstable temporally or spatially (hereinafter, changes in flow rate over time and positional non-uniformity are collectively referred to as "destabilization"). ), and such destabilization can become a source of noise.

An object of the present invention is to provide a motorized valve that can reduce noise and a refrigeration cycle system equipped with the motorized valve.

The electric valve of the present invention includes a valve housing, a main valve body that changes the opening degree of a main valve port of a main valve chamber provided in the valve housing, and a sub valve of a sub valve chamber provided in the main valve body. The motor-operated valve includes a sub-valve body that changes the opening degree of a port, and a drive unit that drives the sub-valve body forward and backward in an axial direction, the valve housing having an opening in a direction intersecting the axial direction. and a second port that communicates with the main valve port and opens in the axial direction, and the main valve body extends in a direction crossing the axial direction and is connected to the sub valve body and a cylindrical portion extending from the partition wall toward a side opposite to the main valve port, and the auxiliary valve chamber is formed by the partition wall and the cylindrical portion. At least one communication hole is formed in the cylindrical part to communicate between the inside and outside of the cylindrical part, and the sub-valve port is a through-hole formed in the partition part, and the auxiliary valve port is a through-hole formed in the partition wall part, and the auxiliary valve port is a through-hole formed in the partition wall part, and the auxiliary valve port is a through-hole formed in the partition wall part. , and a small diameter portion located closer to the main valve port than the open end and having a smaller diameter than the open end.

According to the present invention as described above, since the sub-valve port has the open end and the small diameter part, the space between the sub-valve body and the open end is smaller than the space between the sub-valve body and the small-diameter part. The space can be enlarged. When fluid passes from the auxiliary valve chamber through the auxiliary valve port and heads toward the main valve port, the fluid passes through the space between the auxiliary valve body and the open end, and then flows between the auxiliary valve body and the small diameter portion. pass through the space between. At this time, the space between the sub-valve body and the small diameter part becomes the throttle part and determines the actual valve opening (opening area), and a larger space is provided on the upstream side of the valve, that is, upstream of the throttle part. The fluid can be rectified once on the side. Therefore, even if the flow rate becomes unstable when the fluid passes through the first port and the communication hole of the valve housing and flows into the auxiliary valve chamber, the noise can be reduced by rectifying the fluid. can.

In this case, in the electric valve of the present invention, the auxiliary valve port may have a tapered portion between the opening end portion and the small diameter portion, the inner diameter of which decreases toward the main valve port side. preferable. According to such a configuration, the fluid can easily flow along the tapered portion, and disturbances in the fluid flow can be suppressed.

Further, in the electric valve of the present invention, the sub-valve port includes a cylindrical inner circumferential surface extending along the axial direction between the opening end portion and the small diameter portion, and a cylindrical inner circumferential surface extending along the axial direction, and a It may have a stepped portion formed by an annular portion extending radially inward from the end on the main valve port side. According to such a configuration, the volume of the space between the cylindrical portion and the sub-valve body can be easily ensured, and the fluid can be easily rectified.

Further, in the electric valve of the present invention, it is preferable that the small diameter portion is provided closer to the main valve port than the axial center portion of the partition wall portion, and is a portion having the smallest inner diameter in the sub valve port. According to such a configuration, the axial dimension of the space for rectifying the fluid can be ensured, the volume can be increased, and the fluid can be easily rectified.

The refrigeration cycle system of the present invention includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, an electronic expansion valve provided between the indoor heat exchanger and the outdoor heat exchanger, and the indoor heat exchanger. A refrigeration cycle system including a dehumidification valve provided in an exchanger, characterized in that any one of the electric valves described above is used as the dehumidification valve. According to the present invention as described above, noise can be reduced in the electric valve as described above.

According to the electric valve and refrigeration cycle system of the present invention, noise can be reduced.

FIG. 1 is a sectional view showing an electrically operated valve according to an embodiment that is an example of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the motor-operated valve when the opening degree of the sub-valve port is at its minimum. FIG. 2 is an enlarged cross-sectional view of a main part of the motor-operated valve when the opening degree of the sub-valve port is medium. FIG. 3 is an enlarged cross-sectional view of a main part of the motor-operated valve when the opening degree of the sub-valve port is maximized. FIG. 3 is a sectional view showing a cross section passing through a cylindrical portion of the electric valve. It is a system diagram showing an example of a refrigeration cycle system in which the electric valve is provided. FIG. 7 is an enlarged cross-sectional view of the main parts of the motor-operated valve of the first modification when the opening degree of the sub-valve port is at its minimum; FIG. 7 is an enlarged cross-sectional view of a main part of the electric valve of the first modification when the opening degree of the auxiliary valve port is maximized. FIG. 7 is an enlarged cross-sectional view of the main part of the electric valve of the second modification when the opening degree of the auxiliary valve port is at its minimum. FIG. 7 is an enlarged cross-sectional view of the main part of the electric valve of the second modification when the opening degree of the auxiliary valve port is medium. FIG. 7 is an enlarged cross-sectional view of the main part of the motor-operated valve of the second modification when the opening degree of the sub-valve port is maximized. FIG. 3 is an enlarged cross-sectional view of the main part of the motor-operated valve according to the embodiment when the valve opening degree of the sub-valve port is set to 0. FIG. 7 is an enlarged cross-sectional view of the main part of the electric valve of the first modification when the valve opening degree of the auxiliary valve port is set to 0; FIG. 7 is an enlarged cross-sectional view of the main part of the electric valve of the second modification when the valve opening degree of the auxiliary valve port is set to 0;

Embodiments of the present invention will be described with reference to the drawings. The electric valve 1 of this embodiment is used in a refrigeration cycle system of an air conditioner such as a package air conditioner or a room air conditioner, and as shown in FIG. The valve body 4 includes a body 4, a sub-valve body 5, and a drive section 6. The main valve body 4 and the sub-valve body 5 are provided so as to move along a predetermined axial direction, and hereinafter, this axial direction will be referred to as the Z direction, and the two directions orthogonal to the Z direction will be referred to as the X direction and the Y direction. The upper and lower directions in the Z direction are based on FIG.

The valve housing 2 is made of, for example, brass or stainless steel and has a substantially cylindrical shape, and has a main valve chamber 2R inside thereof. The valve housing 2 has a first port 21 opened on one side in the X direction and a second port 22 opened on the lower side in the Z direction. The first joint pipe 11 extending along the X direction is connected to the first port 21, the second joint pipe 12 extending along the Z direction is connected to the second port 22, and the first joint pipe 11 and The second joint pipe 12 communicates with the main valve chamber 2R. The first joint pipe 11 and the second joint pipe 12 may be fixed to the valve housing 2 by, for example, brazing.

A cylindrical main valve seat 23 is formed at the lower end of the valve housing 2 and projects toward the main valve chamber 2R (upwards) with the Z direction as the axial direction. The main valve port 23a and the second port 22 communicate with each other. That is, the second joint pipe 12 is connected to the main valve chamber 2R via the main valve port 23a. In this embodiment, the electric valve 1 has the first port 21 as the primary side and the second port 22 as the secondary side, and the fluid (refrigerant) flowing into the main valve chamber 2R from the first joint pipe 11 is transferred to the second port 22. Although it is assumed that the motor-operated valve 1 is used to flow out of the joint pipe 12, the motor-operated valve 1 may be incorporated into a cycle in which fluid can flow in both directions.

The guide member 3 is attached to the opening at the upper end of the valve housing 2, and includes a press-fitting part 31 that is press-fitted into the inner peripheral surface of the valve housing 2, and a substantially cylindrical shape located inside the press-fitting part 31. It has a guide part 32, a holder part 33 extending above the guide part 32, and a ring-shaped flange part 34 located on the outer periphery of the guide part 32. The press-fitting part 31, the guide part 32, and the holder part 33 are constructed as an integral part made of resin. Further, the flange portion 34 is a metal plate made of, for example, brass or stainless steel, and is integrally provided with the resin press-fit portion 31 and the holder portion 33 by insert molding.

The guide member 3 is assembled to the valve housing 2 and is fixed to the upper end of the valve housing 2 at the flange portion 34 by welding. Further, in the guide member 3, a cylindrical guide hole 32a whose axial direction is in the Z direction is formed in the guide part 32, and a female threaded part (screw hole) 33a coaxial with the guide hole 32a is formed in the center of the holder part 33. has been done.

The main valve body 4 is disposed within the guide hole 32a of the holder portion 33, and is entirely formed in a cylindrical shape with its axis extending in the Z direction. The main valve body 4 includes a partition wall portion 41 that extends along the XY plane and to which the sub valve body 5 approaches or separates, and a cylindrical portion that extends from the partition wall portion 41 toward the opposite side (upper side) from the main valve port 23a. 42 and a main valve portion 43 that approaches or separates from the main valve seat 23.

The partition wall portion 41 is a sub-valve seat portion provided at the lower end of the cylindrical portion 42, and is formed into a plate shape having a predetermined thickness (Z-direction dimension). A bottomed cylindrical portion is formed by the partition wall portion 41 and the cylindrical portion 42, and the inside of this bottomed cylindrical portion becomes the sub-valve chamber 4R. A sub-valve port 41a, which is a through hole, is formed in the center of the partition wall portion 41. The cylindrical portion 42 is formed into a cylindrical shape, and the inner circumferential surface thereof serves as a needle guide hole 42a. A washer 53 attached to a valve shaft 51 (described later) and a guide boss portion 54 are inserted into the needle guide hole 42a of the cylindrical portion 42, and a ring-shaped retainer is provided at the upper end of the cylindrical portion 42. 44 is fixed by fitting or welding. Further, a main valve spring 4a is disposed between the retainer 44 and the upper end of the guide hole 32a, and the main valve body 4 is moved toward the main valve seat 23 (lower side in the Z direction; closed) by the main valve spring 4a. direction).

As shown in FIG. 5, the cylindrical portion 42 is formed with a plurality of communication holes 421 (four in this embodiment, it is sufficient if one or more are formed) that communicate the inside and outside of the cylindrical portion 42. . The four communication holes 421 are arranged at equal intervals in the circumferential direction centered on the Z direction. In FIG. 5, two communication holes 421 are lined up in the X direction and two other communication holes 421 are lined up in the Y direction, but the main valve body 4 is rotatable with respect to the valve housing 2. The position of the communication hole 421 can be changed by rotation of the main valve body 4. That is, the positional relationship between the communication hole 421 and the first port 21 may change. By forming the communication hole 421 in the cylindrical portion 42, the main valve chamber 2R, the sub-valve chamber 4R, the sub-valve port 41a, and the main valve port 23a communicate with each other.

The main valve part 43 is formed into a substantially cylindrical shape so that the cylindrical part 42 extends below the partition part 41. The main valve portion 43 may be seated (in contact with) the main valve seat 23 in the fully closed state, or may be separated from it to some extent.

The sub-valve body 5 is a needle valve, and is provided at the lower end of a rotor shaft 61, which will be described later, and includes a valve shaft 51 connected to the rotor shaft 61 side and a needle portion 52 connected to the lower end of the valve shaft 51. It has an integrated structure. The sub-valve body 5 further includes an annular washer 53 disposed on the valve stem 51 and a guide boss portion 54 fixed to the valve stem 51. Although the guide boss portion 54 is fixed separately from the valve shaft 51, the guide boss portion 54 may be formed integrally with the valve shaft 51. The washer 53 and the guide boss portion 54 are slidably inserted into the needle guide hole 42a.

The drive unit 6 is provided inside and outside of a case 24 fixed to the upper end of the valve housing 2, and includes a stepping motor 6A, a screw feeding mechanism 6B that advances and retreats the sub-valve body 5 by rotation of the stepping motor 6A. , and a stopper mechanism 6C that restricts rotation of the stepping motor 6A. The case 24 is airtightly fixed to the valve housing 2 by, for example, welding.

The stepping motor 6A includes a rotor shaft 61, a magnet rotor 62 rotatably disposed inside a case 24, a stator coil 63 disposed opposite to the magnet rotor 62 on the outer periphery of the case 24, and other components shown in the figure. It is made up of a yoke, exterior members, etc. The rotor shaft 61 is attached to the center of the magnet rotor 62 via a bush, and a male threaded portion 61a is formed on the outer periphery of the rotor shaft 61 on the guide member 3 side. The male threaded portion 61a is screwed into the female threaded portion 33a of the guide member 3, so that the guide member 3 supports the rotor shaft 61 on the axis along the Z direction. The female threaded portion 33a of the guide member 3 and the male threaded portion 61a of the rotor shaft 61 constitute a screw feeding mechanism 6B.

Here, details of the opening and closing operations of the main valve body 4 and the sub valve body 5 in the electric valve 1 will be explained. When the magnet rotor 62 and the rotor shaft 61 are rotated by the driving of the stepping motor 6A, the rotor shaft 61 is moved along the Z direction by the screw feeding mechanism 6B of the male threaded portion 61a of the rotor shaft 61 and the female threaded portion 33a of the guide member 3. do. As a result, the sub-valve body 5 moves forward and backward in the Z direction, approaches or separates from the sub-valve port 41a, and the valve opening degree of the sub-valve port 41a is controlled. Further, the sub-valve body 5 (washer 53) engages with the main valve body 4 (retainer 44), and the main valve body 4 moves together with the sub-valve body 5 to approach or separate from the main valve seat 23. Thereby, the flow rate of the refrigerant flowing from the first joint pipe 11 toward the second joint pipe 12 is controlled.

A protrusion 62a is formed on the magnet rotor 62, and as the magnet rotor 62 rotates, the protrusion 62a operates the rotation stopper mechanism 6C, and the lowermost and uppermost ends of the rotor shaft 61 (and the magnet rotor 62) are rotated. Location is regulated. FIG. 1 shows a state in which the rotor shaft 61 (and the magnet rotor 62) is at the lowest position.

The detailed shapes of the sub-valve port 41a and the sub-valve body 5 and their relationship will be described below with reference to FIGS. 2 to 4. FIG. 2 shows a state in which the auxiliary valve body 5 is positioned at the lowest end position and the valve opening degree of the auxiliary valve port 41a is minimized, and FIG. 3 shows a state in which the auxiliary valve body 5 is positioned above the lowest end position. FIG. 5 shows a state in which the auxiliary valve body 5 is positioned at the uppermost position and the valve opening of the auxiliary valve port 41a is at its maximum. The sub-valve body 5 does not contact the partition wall portion 41 at the lowest end position, and fluid can pass through the sub-valve port 41a. Further, at the uppermost position, the lower end (tip end) of the sub-valve body 5 is located within the sub-valve port 41a.

The auxiliary valve port 41a has a tapered portion 412 whose inner diameter gradually decreases from the upper end surface 411 toward the lower side (main valve port 23a side), and a tapered portion 412 that extends downward from the lower end of the tapered portion 412 ( It has a cylindrical inner circumferential surface 413 (having a constant inner diameter). An upper end portion 412A of the tapered portion 412 is located at an end portion of the partition wall portion 41 on the opposite side to the main valve port 23a, and serves as an open end portion. The cylindrical inner circumferential surface 413 is located closer to the main valve port 23a than the upper end 412A and is formed to have a smaller diameter than the upper end 412A. Further, the cylindrical inner circumferential surface 413 has the smallest inner diameter at the sub-valve port 41a.

The tapered portion 412 is formed over half or more of the entire sub-valve port 41a. That is, the cylindrical inner circumferential surface 413 is provided closer to the main valve port 23a than the central portion of the partition wall portion 41 in the Z direction. Moreover, it is preferable that the cylindrical inner circumferential surface 413 is provided in a lower ⅓ region of the partition wall portion 41 in the Z direction.

The needle portion 52 of the sub-valve body 5 includes, from the upper side in the Z direction, a first straight portion 521 that is formed continuously with the valve shaft 51 and has a constant outer diameter, and an outer diameter that gradually decreases toward the lower side in the Z direction. A first tapered portion 522 that gradually becomes smaller in diameter, a second straight portion 523 that has a constant outer diameter, and a second tapered portion 524 that has a truncated conical shape and whose outer diameter gradually decreases toward the bottom in the Z direction. have

The angle of inclination of the first tapered portion 522 with respect to the Z direction is smaller than the angle of inclination of the tapered portion 412 of the sub valve port 41a with respect to the Z direction. That is, in a state where the first tapered part 522 and the tapered part 412 are opposed to each other as shown in FIG. 2, the distance between them becomes larger toward the upper side in the Z direction. The outer diameter of the second straight portion 523 is smaller than the inner diameter of the cylindrical inner peripheral surface 413.

In the state shown in FIG. 2, the lower end portion of the first straight portion 521, the entire first tapered portion 522, the entire second straight portion 523, and the upper end portion of the second tapered portion 524 are connected to the sub valve port. It is located inside 41a. The distance between the sub-valve body 5 and the sub-valve port 41a is minimum between the second straight portion 523 and the cylindrical inner circumferential surface 413, and this position becomes the minimum constriction portion A1. The larger the distance between the sub-valve body 5 and the sub-valve port 41a, the larger the cross-sectional area through which fluid can pass, making it easier for the fluid to pass through. I will explain. Above the minimum aperture portion A1, a passage portion A2 is formed between the first straight portion 521 and the tapered portion 412, and a passage portion A3 is formed between the first tapered portion 522 and the tapered portion 412. In the passage portion A3, the distance between the sub-valve body 5 and the sub-valve port 41a is larger than in the minimum throttle portion A1, and in the passage portion A2, the distance between the sub-valve body 5 and the sub-valve port 41a is larger than in the passage portion A3. .

In this way, a part where the distance between the sub-valve body 5 and the sub-valve port 41a is large is formed above the minimum throttle part A1 (upstream side when the first port 21 is the primary side), and this part is , because it is easy for fluid to pass through, it becomes a rectifier where fluid is rectified. At this time, both the first passage section A1 and the second passage section A2 may function as a rectifying section, or only one of them may function as a rectifying section. That is, since it is difficult to obtain a rectifying effect if the distance between the sub-valve body 5 and the sub-valve port 41a is too large or small, a portion where this distance is an appropriate size may serve as a rectifier. In this way, the flow straightening section may be formed at the open end (upper end 412A), or at a position between the open end and the small diameter section. In the illustrated example, the second passage section A2 mainly functions as a rectifying section.

In the state shown in FIG. 3, the lower portion of the first tapered portion 522, the entire second straight portion 523, and the entire second tapered portion 524 are located inside the sub-valve port 41a. The distance between the sub-valve body 5 and the sub-valve port 41a is minimum between the second tapered part 524 and the upper end of the cylindrical inner peripheral surface 413 (boundary part with the tapered part 412), and this position is the minimum aperture. This will be part A4. Similar to the state shown in FIG. 2, a portion where the distance between the sub-valve body 5 and the sub-valve port 41a is large is formed above the minimum constriction portion A4, and this portion serves as a rectifying portion. In the illustrated example, the passage section A5 between the first tapered section 522 or the second straight section 523 and the tapered section 412 mainly functions as a rectifying section.

In the state shown in FIG. 4, only the lower portion of the second tapered portion 524 is located inside the auxiliary valve port 41a. The distance between the sub-valve body 5 and the sub-valve port 41a is minimum between the tip of the second tapered portion 524 and the tapered portion 412, and this position becomes the minimum constriction portion A6. In other words, no minimum constriction portion is formed on the cylindrical inner circumferential surface 413 serving as the small diameter portion. Similar to the states shown in FIGS. 2 and 3, a passage part A7, which is a part where the distance between the sub-valve body 5 and the sub-valve port 41a is large, is formed above the minimum constriction part A6, and this passage part A7 is a rectifying part. Becomes a department.

Since the auxiliary valve port 41a has the tapered portion 412, if at least a portion of the needle portion 52 is located inside the auxiliary valve port 41a, the minimum constriction portion and the position above the minimum constriction portion are similar to the above. A rectifying section is formed. That is, between the state shown in FIG. 3 and the state shown in FIG. 5, although the portion of the needle portion 52 that faces the sub-valve port 41a within the XY plane changes, the minimum constriction portion and the rectification portion are formed. Ru. Note that the sub-valve body 5 may be provided so as to move beyond this range.

When the fluid that has flowed into the main valve chamber 2R from the first port 21 passes through the communication hole 421 of the main valve body 4 and flows into the auxiliary valve chamber 4R, the flow rate may be different in each of the four communication holes 421. . That is, the closer the communication hole 421 is to the first port 21 (facing the first port 21 side), the higher the flow rate becomes, and the farther the communication hole 421 is from the first port 21 (not facing the first port 21 side), the higher the flow rate becomes. tends to become smaller. Therefore, a difference occurs in the flow rate of the fluid that passes through the four communication holes 421 and reaches the sub-valve port 41a, and the flow rate of the fluid may vary depending on the position and become non-uniform in the vicinity of the sub-valve port 41a. .

Further, since the main valve body 4 rotates and the positional relationship between the communication hole 421 and the first port 21 may change, the flow rate of the fluid passing through the communication hole 421 may change over time. The fluid flow rate may become temporally unstable in the vicinity.

Even if the flow rate becomes unstable spatially or temporally as described above, the fluid passing through the sub-valve port 41a will be rectified by passing through the rectifier, and then the actual valve opening will be adjusted. The flow rate is adjusted by being throttled by the determined minimum throttle part.

Next, an example of a refrigeration cycle system in which the electric valve 1 of this embodiment is provided will be described based on FIG. 6. This refrigeration cycle system is used, for example, in an air conditioner such as a household air conditioner. The electric valve 1 is provided as a "dehumidification control valve" between the first indoor heat exchanger 91 (operates as a cooler during dehumidification) and the second indoor heat exchanger 92 (operates as a heater during dehumidification). . The electric valve 1, the first indoor heat exchanger 91, the second indoor heat exchanger 92, the electronic expansion valve 93, the outdoor heat exchanger 94, the compressor 95, and the four-way valve 96 constitute a heat pump refrigeration cycle. are doing. The first indoor heat exchanger 91, the second indoor heat exchanger 92, and the electric valve 1 are installed indoors, and the electronic expansion valve 93, outdoor heat exchanger 94, compressor 95, and four-way valve 96 are installed outdoors. It constitutes a heating and cooling system.

According to the present embodiment described above, the sub-valve port 41a has the upper end 412A as the open end and the cylindrical inner peripheral surface 413 as the small diameter part, so that the rectifying part is provided upstream of the minimum throttle part. can be formed. Therefore, even if the flow rate becomes unstable when the fluid passes through the first port 21 and the communication hole 421 and flows into the sub-valve chamber 4R, noise can be reduced by rectifying the fluid. can.

Furthermore, since the sub-valve port 41a has the tapered portion 412, the fluid can easily flow along the tapered portion 412, and disturbances in the fluid flow can be suppressed.

Furthermore, by providing the cylindrical inner circumferential surface 413 as a small diameter portion closer to the main valve port 23a than the central portion of the partition wall portion 41 in the Z direction, the dimension of the space for rectifying the fluid in the Z direction is secured. This allows the volume to be increased, making it easier to rectify the fluid.

Note that the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the object of the present invention, and the present invention also includes the following modifications. For example, in the embodiment described above, the sub-valve port 41a has the tapered portion 412, and the sub-valve body 5 has the tapered portions 522, 524, but the combination of shapes of the sub-valve port and the sub-valve body is as follows. Not limited.

In the first modification shown in FIGS. 7 and 8, the sub-valve port 41a has the same shape as the embodiment described above, and the needle part 52A of the sub-valve body 5A is connected to the first straight part 521 and the first straight part 521 in order from the upper side in the Z direction. It has a first tapered part 522 and a second straight part 525. FIG. 7 shows a state in which the auxiliary valve body 5A is positioned at the lowest end position and the valve opening degree of the auxiliary valve port 41a is minimized, and FIG. 8 shows a state in which the auxiliary valve body 5A is positioned at the highest end position and This shows a state where the valve opening degree of the valve port 41a is at its maximum. The sub-valve body 5A does not contact the partition wall portion 41 at the lowest end position, and fluid can pass through the sub-valve port 41a. In addition, the sub-valve element 5A has its lower end (tip) located inside the sub-valve port 41a in both the lowermost and uppermost positions. When moving between the two, the second straight part 525 of the needle part 52A faces the sub-valve port 41a in the XY plane.

In the state shown in FIG. 7, a minimum constriction part A8 is formed between the lower end of the second straight part 525 and the tapered part 412, and the passage between the second straight part 525 and the upper end 412A of the tapered part 412 is Section A9 functions as a rectifier. Similarly, in the state shown in FIG. 8, the minimum narrowing portion A10 is formed between the lower end of the second straight portion 525 and the tapered portion 412, and the minimum narrowing portion A10 is formed between the second straight portion 525 and the upper end portion 412A of the tapered portion 412. A passage section A11 between the two functions as a rectifying section.

In addition, in the first modification, it is assumed that the dimension of the cylindrical inner peripheral surface 413 in the Z direction is smaller than that of the above embodiment, but the dimension of the cylindrical inner peripheral surface may be set as appropriate. Alternatively, the cylindrical inner circumferential surface may be omitted and the entire sub-valve port may be a tapered portion. Alternatively, a cylindrical inner circumferential surface may be formed on the upper end side of the sub-valve port, and a tapered portion may be formed on the lower side thereof.

In the second modification shown in FIGS. 9 to 11, the sub-valve port 41b has a cylindrical inner circumferential surface 414 and an annular portion 415, and the sub-valve body 5 has the same shape as in the embodiment described above. FIG. 9 shows a state in which the auxiliary valve body 5 is positioned at the lowest end position and the valve opening degree of the auxiliary valve port 41b is minimized, and FIG. 10 shows a state in which the auxiliary valve body 5 is positioned above the lowest end position. FIG. 11 shows a state in which the sub-valve body 5 is positioned at the uppermost position and the opening degree of the sub-valve port 41b is maximum. The sub-valve body 5 does not contact the partition wall portion 41 at the lowest end position, and fluid can pass through the sub-valve port 41b. Further, at the uppermost position, the sub-valve body 5 has its lower end (tip end) disposed inside the valve port 41b.

The cylindrical inner circumferential surface 414 extends downward along the Z direction with the upper end surface 411 of the partition wall 41 as an open end, and has a substantially constant inner diameter. The annular portion 415 is formed in a plate shape and extends along the XY plane from the lower end of the cylindrical inner peripheral surface 414 toward the inner peripheral side. The inner diameter of the annular portion 415 is smaller than the inner diameter of the cylindrical inner circumferential surface 414, and a stepped portion 416 is formed between the cylindrical inner circumferential surface 414 and the annular portion 415. The outer diameter of the second straight portion 523 is smaller than the inner diameter of the through hole of the annular portion 415 .

In the state shown in FIG. 9, a minimum constriction portion A12 is formed between the second straight portion 523 and the annular portion 415, and above this, a connection between the sub valve port 41b and the needle portion 52 is formed above the minimum constriction portion A12. Passage portions with large intervals are formed. Among such passage parts, for example, the passage part A13 mainly between the first straight part 521 and the cylindrical inner circumferential surface 414 functions as a rectifying part. In the state shown in FIG. 10, a minimum constriction part A14 is formed between the tip of the second tapered part 524 and the annular part 415, and above this, the auxiliary valve port 41b and the needle part are located above the minimum constriction part A14. A passage portion having a large distance from the passage portion 52 is formed. Among such passage parts, for example, the passage part A15 mainly between the first taper part 522 and the cylindrical inner circumferential surface 414 functions as a rectifying part. In the state shown in FIG. 11, a minimum constriction part A16 is formed between the tip of the second tapered part 524 and the cylindrical inner circumferential surface 414, and above this, the sub valve port 41b is located above the minimum constriction part A16. A passage portion (passage portion A17 between the second tapered portion 524 and the cylindrical inner circumferential surface 414) having a large interval between the needle portion 52 and the needle portion 52 is formed, and the passage portion A17 functions as a rectification portion.

Furthermore, although combinations of the shapes of the sub-valve port and the sub-valve body have been illustrated as examples of the embodiment, the first modification, and the second modification, these shapes may be combined as appropriate; Not limited. For example, the auxiliary valve port may have both a tapered portion and a stepped portion, and the auxiliary valve port may have an open end and a small diameter portion, and the auxiliary valve port may have an open end and a small diameter portion, and the auxiliary valve port may have an open end and a small diameter portion, and the auxiliary valve port may have an open end and a small diameter portion, and It is only necessary that a rectifying section with a large volume is formed.

Furthermore, in the embodiment described above, the sub-valve body 5 does not contact the partition wall 41 at the lowest end position, and the fluid can pass through the sub-valve port 41a. As shown in the example, a configuration may be adopted in which the sub-valve body abuts against the partition wall, making it impossible for fluid to pass through. FIG. 12 corresponds to the shape of the embodiment described above, and the first tapered portion 522 abuts the boundary between the tapered portion 412 and the cylindrical inner circumferential surface 413. FIG. 13 corresponds to the first modification, in which a portion of the first tapered portion 522 near the first straight portion 521 comes into contact with the upper end portion 412A. FIG. 14 corresponds to the second modification, in which the first tapered portion 522 contacts the upper end of the annular portion 415. Note that the combination of positions where the sub-valve body and the sub-valve port abut are not limited to the above.

Furthermore, in the embodiment described above, the cylindrical inner circumferential surface 413 serving as the small diameter portion is provided closer to the main valve port 23a than the central portion of the partition wall portion 41 in the Z direction. Not limited. For example, if the Z-direction dimension of the partition wall is sufficiently large and it is easy to secure the volume of the rectifier part, the small diameter part may be provided on the opposite side of the main valve port from the Z-direction center of the partition wall. .

Further, in the embodiment, the cylindrical inner circumferential surface 413 serving as the small diameter portion is the portion with the smallest inner diameter in the sub-valve port 41a, and is located closest to the main valve port 23a side of the partition wall portion 41. However, for example, the inner diameter may become larger again from the small diameter portion toward the main valve port side (constricted shape).

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

DESCRIPTION OF SYMBOLS 1... Electric valve, 2... Valve housing, 21... First port, 22... Second port, 23a... Main valve port, 2R... Main valve chamber, 4... Main valve body, 41... Partition wall, 41a, 41b... Sub. Valve port, 412... Tapered part, 412A... Upper end (opening end), 413... Cylindrical inner circumferential surface (small diameter part), 414... Cylindrical inner circumferential surface, 415... Annular part, 416... Step part, 42... Cylindrical part, 421... Communication hole, 4R... Sub-valve chamber, 5... Sub-valve body, 6... Drive section, 91... First indoor heat exchanger, 92... Second indoor heat exchanger 92, 93... Electronic expansion valve , 94...Outdoor heat exchanger

Claims (5)

A valve housing, a main valve body that changes the opening degree of a main valve port of a main valve chamber provided in the valve housing, and a main valve body that changes the opening degree of a auxiliary valve port of a auxiliary valve chamber provided in the main valve body. An electric valve comprising a sub-valve body and a drive unit that drives the sub-valve body forward and backward in the axial direction,
The valve housing has a first port that opens in a direction crossing the axial direction, and a second port that communicates with the main valve port and opens in the axial direction,
The main valve body includes a partition wall portion extending in a direction intersecting the axial direction and to which the sub valve body approaches or separates, and a cylindrical portion extending from the partition wall portion toward a side opposite to the main valve port. , and the sub-valve chamber is formed by the partition wall part and the cylindrical part,
The cylindrical part is formed with at least one communication hole that communicates between the inside and outside of the cylindrical part,
The auxiliary valve port is a through hole formed in the partition wall, and has an open end that is an end opposite to the main valve port, and is located closer to the main valve port than the open end. and a small diameter portion formed to have a smaller diameter than the opening end portion,
In a state where the sub-valve body is located closest to the main valve port, the sub-valve body is separated from the partition wall portion, and the position where the distance between the sub-valve body and the sub-valve port is minimum is as follows: It is formed closer to the main valve port than the axial center portion of the partition wall, and the distance between the sub valve body and the sub valve port at the open end is equal to the distance at the minimum position. An electric valve characterized in that the distance is larger than the distance between the sub-valve body and the sub-valve port . The electric motor according to claim 1, wherein the auxiliary valve port has a tapered portion between the open end portion and the small diameter portion, the inner diameter of which decreases toward the main valve port side. valve. The auxiliary valve port has a cylindrical inner circumferential surface extending along the axial direction between the open end and the small diameter portion, and a cylindrical inner circumferential surface extending radially from an end on the main valve port side of the cylindrical inner circumferential surface. The motor-operated valve according to claim 1 or 2, further comprising: an annular portion extending inward; and a stepped portion formed by the annular portion extending inward. Any one of claims 1 to 3, wherein the small diameter portion is provided closer to the main valve port than the central portion in the axial direction of the partition wall portion, and is a portion having the smallest inner diameter in the auxiliary valve port. The electric valve according to item 1. A compressor, an indoor heat exchanger, an outdoor heat exchanger, an electronic expansion valve provided between the indoor heat exchanger and the outdoor heat exchanger, and a dehumidification valve provided in the indoor heat exchanger. A refrigeration cycle system comprising: a refrigeration cycle system characterized in that the electric valve according to any one of claims 1 to 4 is used as the dehumidification valve.

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