JP7635420B2 - Motor-operated valve - Google Patents

Description

This application claims priority to a Chinese patent application filed with the China Patent Office on March 29, 2021, bearing application number 202110329751.8 and entitled "Motor-operated valve", the entire contents of which are incorporated herein by reference.

The present invention relates to the technical field of cooling control, and in particular to motor-operated valves.

Referring to FIG. 11, CN109723884A discloses an electric valve, which includes a guide bush 20 and a valve stem holder 30, the guide bush 20 being provided with a fixed male thread portion 23, and the valve stem holder 30 being provided with a movable female thread portion 33, and the fixed male thread portion 23 and the movable female thread portion 33 forming a screw feed mechanism 28 of the electric valve. The valve body of the electric valve is mainly composed of three parts.

A disk-shaped pressing plate 61 is placed on the underside of the ceiling 32 of the valve stem holder 30 between the step surface 13 formed between the upper small diameter portion 11 and the lower large diameter portion 12 of the valve stem 10 of the motor-operated valve and the underside of the ceiling 32 of the valve stem holder 30, and a compression coil spring (biasing member) 60 is compressed so that the valve stem 10 is biased in a direction away from the valve stem holder 30 in the vertical direction (axis O direction) so as to be inserted onto the upper small diameter portion 11 of the valve stem 10. In other words, the compression coil spring (biasing member) 60 constantly biases the valve stem 10 (valve body 14) downward (valve closing direction).

The object of the present invention is to provide a motor-operated valve.

An electrically operated valve, comprising: a valve body and a coil, the coil being fitted onto the valve body; the valve body comprising a valve seat member and a valve body rotor unit, the valve body rotor unit comprising a valve stem unit, a valve body, a first elastic component, a contact member and a second elastic component;
The valve stem unit includes a valve stem abutment portion, and the second elastic component is supported by the valve stem abutment portion.
The valve body includes a first valve body abutment portion, the valve body is drilled into the valve stem unit, and the first valve body abutment portion is capable of abutting against the second elastic component,
an upper end of the first elastic component abuts against the valve stem unit, the abutment member includes a first abutment portion, a lower end of the first elastic component abuts against the first abutment portion, the abutment member includes a second abutment portion, the valve body includes a second valve body abutment portion capable of abutting against the second abutment portion, and the abutment member includes a third abutment portion capable of abutting against the valve stem unit,
the valve seat member includes a valve port capable of abutting against the valve body,
When the third contact portion is in contact with the valve stem unit and the first valve body contact portion is in contact with the second elastic component, the second contact portion is not in contact with the second valve body contact portion.

According to the motor-operated valve provided by the present application, when the third contact portion is in contact with the valve stem unit and the first valve body contact portion is in contact with the second elastic part, the second contact portion is not in contact with the second valve body contact portion, and the valve body is not subjected to the elastic load of the first elastic part, thereby reducing the impact force of the valve body on the valve orifice at the moment of contact between the valve body and the valve orifice.

FIG. 2 is a cross-sectional view of the motor-operated valve of the present invention in a fully closed state. FIG. 2 is a structural schematic diagram of a valve seat member of the motor-operated valve of the present invention. 3B is a schematic diagram of the structure of a rotor member when the motor-operated valve of the present invention is in a fully closed state, and FIG. 3B is a partially enlarged view of FIG. 3A. FIG. FIG. 4b is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the valve body is just opened until it is no longer loaded with the elastic force of the first elastic component, and FIG. 4b is a local enlarged view of FIG. 4a. FIG. 5b is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the valve body head is opened just until it does not contact the valve port, and FIG. 5b is a local enlarged view of FIG. 5a. 6B is a cross-sectional view of the valve body when the motor-operated valve of the present invention is opened to the maximum opening degree, and FIG. 6B is a local enlarged view of FIG. 6A. FIG. 7b is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the screw pair is excessively opened until it is unscrewed, and FIG. 7b is a local enlarged view of FIG. 7a. 8B is a cross-sectional view of the valve body when the motor-operated valve according to the second embodiment of the present invention is opened to the maximum opening degree, and FIG. 8B is a local enlarged view of FIG. 8A. 9B is a cross-sectional view of a valve body when the motor-operated valve according to the third embodiment of the present invention is opened to the maximum opening degree, and FIG. 9B is a local enlarged view of FIG. 9A. 10B is a cross-sectional view of a valve body when the motor-operated valve according to the fourth embodiment of the present invention is opened to the maximum opening degree, and FIG. 10B is a local enlarged view of FIG. 10A. FIG. 1 is a cross-sectional view of a motor-operated valve according to the background art.

In order to help those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in more detail below in conjunction with the drawings and specific examples.

Referring to Figs. 1 to 7, Fig. 1 is a cross-sectional view of the motor-operated valve of the present invention in a fully closed state, Fig. 2 is a structural schematic diagram of the valve seat member of the motor-operated valve of the present invention, Fig. 3a is a structural schematic diagram of the rotor member when the motor-operated valve of the present invention is in a fully closed state, Fig. 3b is a local enlarged view of Fig. 3a, Fig. 4a is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the valve body is just opened to the point where it is no longer loaded with the elastic force of the valve body spring, Fig. 4b is a local enlarged view of Fig. 4a, Fig. 5a is a cross-sectional view of the valve body of the motor-operated valve of the present invention when it is opened to the point where the valve body head is just not in contact with the valve port, Fig. 5b is a local enlarged view of Fig. 5a, Fig. 6a is a cross-sectional view of the valve body of the motor-operated valve of the present invention when it is opened to the maximum opening degree, Fig. 6b is a local enlarged view of Fig. 6a, Fig. 7a is a cross-sectional view of the valve body of the motor-operated valve of the present invention when it is opened excessively until the screw pair is unscrewed, and Fig. 7b is a local enlarged view of Fig. 7a.

Referring specifically to Figures 1 to 3b, in one specific embodiment, the motorized valve provided by the present invention includes a valve body and a coil 40, and the coil 40 is fitted onto the valve body. The valve body includes a valve body rotor unit 20 (Figures 3a and 3b), a valve seat member 10 (Figure 2), and a housing 30 (Figure 1).

Referring to FIG. 1, one end of the housing 30 is open, the housing 30 is a thin-walled member and has an enclosure shape, and the open side of its lower end is hermetically welded to the valve seat member 10 to form a storage chamber that can accommodate the upper half of the nut 102 (described below) and the main body of the valve body rotor unit 20 (described below).

Referring to Figures 3a and 3b, the valve body rotor unit 20 of the electric valve includes a rotor 203 having magnetic poles in the circumferential direction, and a valve stem unit 201 fixed and connected to the rotor 203. In this embodiment, the valve stem unit 201 includes a valve stem 2011 and a bush 2012. The bush 2012 is fixed to approximately the upper end position of the valve stem 2011 and is fixed and connected to the valve stem 2011 by a method such as press-fitting or welding, and includes a bush hole portion 20121 that penetrates its upper and lower surfaces. The valve disc rotor unit 20 further includes a valve disc 202 inserted into the central through hole of the valve shaft 2011, a first elastic part 204 provided in a first valve shaft inner wall part 20151 (described below) of the valve shaft 2011, a second elastic part 208 provided in a second valve shaft inner wall part 20153 (described below) of the valve shaft 2011, and an abutment member 206 provided in the first valve shaft inner wall part 20151 of the valve shaft 2011.

Referring to FIG. 1, the coil 40 of the motor-operated valve is connected to a drive controller. After being energized, the drive controller sends a pulse drive signal to the coil 40, which generates a changing magnetic field to drive the valve body rotor unit 20 of the motor-operated valve to rotate clockwise or counterclockwise. In this embodiment, the valve shaft 2011 is fixedly connected to the rotor 203, so that it rotates synchronously with the rotor 203, and the screw feed mechanism of the valve shaft 2011 and the nut 102 converts the rotational motion of the rotor 203 into axial movement to drive the valve body 202 so that the valve body head 202a approaches or moves away from the valve port 10a, thereby realizing the linear switch adjustment function of the motor-operated valve flow rate.

Referring to FIG. 2, combining FIG. 1, the valve seat member 10 has a valve port 10a, a first inlet/outlet passage 10d, and a second inlet/outlet passage 10e, and the valve port 10a communicates with the first inlet/outlet passage 10d and the second inlet/outlet passage 10e to allow a fluid medium (e.g., refrigerant) to pass through. In addition, a through hole penetrating vertically is provided at approximately the center of the valve seat member 10, and a female screw portion 10b (also called a fixed screw portion) is provided on the inner wall of the through hole. The female screw portion 10b is combined with a male screw portion 201a (also called a movable screw portion) provided at a position approximately below the valve shaft 2011 to form a screw pair, i.e., a screw feed mechanism of the motor-operated valve.

In this embodiment, the valve seat member 10 includes a nut 102, the nut 102 includes a through hole, and the inner edge of the through hole of the nut 102 is provided with a female thread portion 10b. The valve seat member 10 further includes a valve seat 101, a part of the nut 102 is located within the valve seat 101, and the nut 102 is fixed and connected to the valve seat 101. For example, the connector is used as an insert and is injection molded as one unit with the nut 102, and the connector and the valve seat 101 are fixed and connected by welding or press-fitting, or the nut 102 and the valve seat 101 are directly press-fitted and fixed. In this embodiment, the connector is used as an insert and is injection molded as one unit with the nut 102, and the connector and the valve seat 101 are welded and fixed to realize the fixed connection between the nut 102 and the valve seat 101. Of course, the nut 102 and the valve seat 101 may be integrally processed and molded.

The nut 102 is provided with a fixed stopper portion 10c that protrudes from the annular base, and engages with a movable stopper portion 201b provided on the valve body rotor unit 20 to form a stopper mechanism for the lower end of the stroke of the electric valve. In other words, when the valve body rotor unit 20 moves downward to a predetermined extent relative to the valve seat member 10, the movable stopper portion 201b abuts against the fixed stopper portion 10c, restricting the rotation of the valve body rotor unit 20 relative to the valve seat member 10 and further restricting the valve body rotor unit 20 from moving continuously downward in the axial direction, thereby controlling the downward stroke of the valve body rotor unit 20.

In this embodiment, the valve orifice 10a is integrally formed on the valve seat 101, or of course, the valve orifice 10a may be formed on another member, which may then be fixed and connected to the valve seat 10. In this embodiment, the valve orifice 10a can abut against the valve body head 202a of the valve body 202, and the valve seat 101 is fixed and connected to the first connecting pipe part 103 and the second connecting pipe part 104. The first connecting pipe part 103 and the second connecting pipe part 104 are generally connected to the system pipe line when the motor-operated valve is installed in a cooling or heating system such as an air conditioner, as an inflow or outflow passage for the fluid medium.

In this embodiment, the first connecting pipe section 103 and the second connecting pipe section 104 are welded and connected to the valve seat 101. Of course, the present invention may also adopt a form in which the flow path through which the refrigerant fluid passes is directly disposed on the valve seat 101, or, for example, when the motor-operated valve is used in a situation requiring rapid repair such as a car air conditioner or a heat pump, the first connecting pipe section 103, the second connecting pipe section 104 and the valve seat 101 may be connected by a seal using a flange. In this embodiment, an example will be described in which the first connecting pipe section 103 and the second connecting pipe section 104 are welded and fixed to the valve seat 101.

3a and 3b, in this embodiment, the valve shaft 2011 includes a hole penetrating vertically, and the inner wall of the through hole approximately forms the valve shaft inner wall portion 2015. In the axial direction of the valve shaft 2011, the inner diameter of the valve shaft inner wall portion 2015 is not uniform. Specifically, the valve shaft inner wall portion 2015 includes a first valve shaft inner wall portion 20151, a step portion 20152, a second valve shaft inner wall portion 20153, a valve shaft abutment portion 20154 and a third valve shaft inner wall portion 20155. In the axial direction of the motor-operated valve, the first valve The shaft inner wall portion 20151 is located above the second shaft inner wall portion 20153, the second shaft inner wall portion 20153 is located above the third shaft inner wall portion 20155, and in a plane on which the cross section of the valve shaft 2011 is located, the orthogonal projection (the orthogonal projection is a closed line or annular surface) of the first shaft inner wall portion 20151 along the plane is located outside the orthogonal projection (the orthogonal projection is a closed line or annular surface) of the second shaft inner wall portion 20153 along the plane. The orthogonal projection of the first valve shaft inner wall portion 20151, the second valve shaft inner wall portion 20153, and the third valve shaft inner wall portion 20155 along the plane (the orthogonal projection is a closed line or annular surface) is located outside the orthogonal projection of the third valve shaft inner wall portion 20155 along the plane (the orthogonal projection is a closed line or annular surface). In general, in order to facilitate processing and manufacturing, the cross sections of the first valve shaft inner wall portion 20151, the second valve shaft inner wall portion 20153, and the third valve shaft inner wall portion 20155 are all set to be circular. In this case, the diameter of the first valve shaft inner wall portion 20151 is equal to the diameter of the second valve shaft inner wall portion 20155. 20153, and the diameter of the second valve shaft inner wall portion 20153 is larger than the diameter of the third valve shaft inner wall portion 20155. In this embodiment, the first valve shaft inner wall portion 20151, the second valve shaft inner wall portion 20153, and the third valve shaft inner wall portion 20155 are all equal in diameter in the height direction, so that the orthogonal projection of the first valve shaft inner wall portion 20151, the second valve shaft inner wall portion 20153, and the third valve shaft inner wall portion 20155 along the plane in which the cross section of the valve shaft 2011 is located is a circle.

3a and 3b, the step portion 20152 and the valve shaft abutment portion 20154 have an extending distance in the horizontal direction, the step portion 20152 is higher than the valve shaft abutment portion 20154, its outer edge intersects with the first valve shaft inner wall portion 20151, its inner edge intersects with the second valve shaft inner wall portion 20153, the outer edge of the valve shaft abutment portion 20154 intersects with the second valve shaft inner wall portion 20153, and its inner edge intersects with the third valve shaft inner wall portion 20155, and the cross sections of the first valve shaft inner wall portion 20151, the second valve shaft inner wall portion 20153, and the third valve shaft inner wall portion 20155 are all circular, the step portion 20152 and the valve shaft abutment portion 20154 are both orthogonally projected along the plane on which the cross section of the valve shaft 2011 is located, and in this embodiment, the step portion 20152 and the valve shaft abutment portion 20154 are horizontal, but of course the step portion 20152 and the valve shaft abutment portion 20154 may be provided in an incomplete planar shape, for example, the valve shaft abutment portion 20154 gradually extends upward or downward in a direction away from the center of the valve shaft abutment portion 20154, and just like the step portion 20152, the valve shaft abutment portion 20154 and the step portion 20152 have an extension distance in the horizontal direction.

Of course, the above describes one structure of the first valve shaft inner wall portion 20151, the step portion 20152, the second valve shaft inner wall portion 20153, the valve shaft abutment portion 20154, and the third valve shaft inner wall portion 20155. However, the first valve shaft inner wall portion 20151, the step portion 20152, the second valve shaft inner wall portion 20153, the valve shaft abutment portion 20154, and the third valve shaft inner wall portion 20155 of the present invention are not limited to the above structure. In this embodiment, Between the inner wall portion 20151 and the second valve shaft inner wall portion 20153, there is one step portion 20152 having a horizontal extension distance, and between the second valve shaft inner wall portion 20153 and the third valve shaft inner wall portion 20155, there is only one valve shaft abutment portion 20154 having a horizontal extension distance, the valve shaft abutment portion 20154 abuts against the valve body 202, and the step portion 20152 abuts against the abutment member 206.

Referring to FIG. 1, in this embodiment, the valve shaft 2011 includes an outer edge portion 2016. Specifically, the outer edge portion 2016 includes a first outer edge portion 20161 and a second outer edge portion 20162. In the axial direction of the motor-operated valve, the first outer edge portion 20161 is located above the second outer edge portion 20162. In the plane in which the cross section of the valve shaft 2011 is located, the outer edge of the orthogonal projection of the first outer edge portion 20161 along the plane is located outside the outer edge of the orthogonal projection of the second outer edge portion 20162 along the plane. In order to facilitate processing, the outer edges of the first outer edge portion 20161 and the second outer edge portion 20162 are both set in a circular shape. The first outer edge portion 20161, A rotor fixing part 201c is provided at the part located on the valve shaft 2011, and the rotor 203 and the rotor fixing part 201c are fixed to each other by direct or indirect welding, crimping, injection connection with magnetic plastic material, bonding with adhesive, or other methods. In this embodiment, the connection part is connected to the magnetic plastic material as an insert and injected, and then fixed to the valve shaft 2011 by welding. When the rotor 203 and the valve shaft 2011 are directly connected to each other, the valve shaft 2011 may be connected to the magnetic plastic material as an insert and injected.

The second outer edge 20162 is provided with a male threaded portion 201a, which is combined with a female threaded portion 10b provided in the inner hole of the nut 102 to form the screw feed mechanism (screw pair) of the motor-operated valve.

Referring to Figs. 3a and 3b, in this embodiment, the motor-operated valve further includes a second elastic part 208. In this embodiment, the second elastic part 208 is a cylindrical coil spring, which is located within the second valve shaft inner wall part 20153 and fitted onto the valve body 202, and its upper end part can abut against the first valve body abutment part 202b of the valve body 202 (in the motor-operated valve of Figs. 3a and 3b, the upper end part of the second elastic part 208 has not yet abutted against the first valve body abutment part 202b), and the second elastic part 208 is supported by the valve shaft abutment part 20154.

Since there is an overlapping area between the orthogonal projection of the valve stem abutment portion 20154 along the plane on which the cross section of the valve stem unit 201 is located and the orthogonal projection of the second elastic part 208 along the plane, the second elastic part 208 can be supported by the valve stem abutment portion 20154. Of course, if a member such as a washer is provided between the valve stem abutment portion 20154 and the second elastic part 208 to prevent direct abutment, the projection relationship between the valve stem abutment portion 20154 and the second elastic part 208 does not have to satisfy the above relationship.

Referring to Figures 3a and 3b, in this embodiment, the valve body 202 is drilled into the valve stem unit 201 (a part of the valve body 202 is located within the valve stem inner wall portion 2015), and the valve body 202 has a stepped shaft-like structure and includes a valve body head 202a, which is located approximately at the lower end of the valve body 202 and below the third valve stem inner wall portion 20155, and the tip shape of the valve body head 202a is related to the required flow rate adjustment curve of the motor-operated valve.

The valve body 202 further includes a first valve body abutment portion 202b that can abut against the second elastic part 208, and in the state of Figs. 3a and 3b, the first valve body abutment portion 202b is not yet abutted against the second elastic part 208. In the plane in which the cross section of the valve body 202 is located, there is an overlapping area between the orthogonal projection of the first valve body abutment portion 202b along the plane and the orthogonal projection of the second elastic part 208 along the plane, so the first valve body abutment portion 202b can abut against the second elastic part 208. Of course, if a member such as a washer is provided between the first valve body abutment portion 202b and the second elastic part 208 to prevent direct abutment, the projection relationship between the first valve body abutment portion 202b and the second elastic part 208 does not have to satisfy the above relationship.

In this embodiment, the outer edge of the first valve body abutment portion 202b and the cross section of the second valve shaft inner wall portion 20153 are both circular, the diameter of the first valve body abutment portion 202b is slightly smaller than the diameter of the second valve shaft inner wall portion 20153, the outer diameter of the second elastic part 208 is slightly smaller than the diameter of the second valve shaft inner wall portion 20153, and the outer diameter of the second elastic part 208 is larger than the diameter of the third valve shaft inner wall portion 20155, and in this case, the valve body 202 can be supported by the second elastic part 208.

Referring again to Figures 3a and 3b, the valve body 202 of this embodiment includes a valve body body 2021 and a valve body sleeve 2022. The valve body sleeve 2022 includes a valve body sleeve hole 20221. The valve body sleeve hole 20221 penetrates the upper and lower surfaces of the valve body sleeve 2022. The upper end of the valve body body 2021 penetrates the valve body sleeve hole 20221. The valve body body 2021 and the valve body sleeve 2022 are fixed and connected by a method such as press-fitting, welding, or adhesive.

In this embodiment, the diameter of the valve body head 202a is set to be larger than the diameter of the third valve shaft inner wall portion 20155, the valve body main body portion 2021 is inserted from bottom to top into the central through hole of the valve shaft 2011, and the valve body sleeve 2022 is fitted from top to bottom and fixed to the valve body main body portion 2021.

Referring to Figures 3a and 3b, the valve body rotor unit 20 of the motor-operated valve of this embodiment further includes a first elastic part 204, which is designed as a cylindrical coil spring and is located within the first valve shaft inner wall part 20151.

The motor-operated valve provided in this embodiment includes a spring abutment portion 20a, which is generally a portion of the valve stem unit 201 that abuts against the upper end of the first elastic part 204, where the abutment includes direct abutment or indirect abutment. For example, if a member such as a washer is provided between the bush 2012 and the first elastic part 204, the bush 2012 still receives the elastic load of the first elastic part 204, and the valve stem unit 201 still abuts against the first elastic part 204. In this embodiment, the bush 2012 abuts against the first elastic part 204 and includes the spring abutment portion 20a.

The motor-operated valve provided by the present application further includes an abutment member 206, the abutment member 206 including a first abutment portion 206a, the lower end of the first elastic part 204 abutting against the first abutment portion 206a, the abutment member 206 further including a second abutment portion 206b capable of abutting against the second valve body abutment portion 202c, and the abutment member 206 further including a third abutment portion 206c capable of abutting against the valve stem unit 201.

In this embodiment, the lower end surface of the valve body sleeve 2022 can abut against the second elastic part 208 (for example, in the state of the motor-operated valve in Figs. 5a and 5b, which will be described below), and the upper end surface of the valve body sleeve 2022 can abut against the washer member 2061 (for example, in the state of Figs. 3a and 3b), and the valve body sleeve 2022 includes a first valve body abutment portion 202b and a second valve body abutment portion 202c.

Continuing to refer to Figures 3a and 3b, in this embodiment, the abutment member 206 is a washer member 2061, which includes a washer hole 20611, which penetrates the upper and lower surfaces of the washer 2061, and the upper end of the valve body 202 penetrates the washer hole 20611 and also penetrates the first elastic part 204 and the washer hole 20221, with a part of it being located in the washer hole 20221.

With the above installation, if radial deviation occurs, the first elastic part 204 is restricted by the valve body 202, reducing radial deviation and making the first elastic part 204 more stable within the valve stem unit 201, thereby extending the service life of the motor-operated valve.

The washer member 2061 can abut against the step portion 20152; specifically, since there is an overlapping area between the orthogonal projection of the washer member 2061 along the plane in which the cross-section of the motor-operated valve is located and the orthogonal projection of the step portion 20152 along the plane, the washer member 2061 can abut against the step portion 20152; of course, when two or more washer members 2061 are provided between the washer member 2061 and the step portion 20152, each of the washer members 2061 and the step portion 20152 does not necessarily satisfy the above relationship. In this embodiment, the outer edge of the washer member 2061 and the inner edge of the step portion 20152 are both circular, the outer diameter of the washer member 2061 is slightly smaller than the diameter of the first valve shaft inner wall portion 20151 of the valve shaft, and the outer diameter of the washer member 2061 is larger than the diameter of the second valve shaft inner wall portion 20153.

Referring to Figures 3a and 3b, Figure 1 is combined to show the state when the motor-operated valve is fully closed (i.e., the valve body rotor unit 20 is at the bottom end of its stroke). In this case, the valve body head 202a is abutted against the valve port 10a and pressed, and the first elastic part 204 is in a compressed state. In this state, there is an axial distance between the first valve body abutment part 202b and the second elastic part 208, and the two are in a non-abutment state. The second valve body abutment part 202c is abutted against the second abutment part 206b of the washer member 2061, and there is an axial distance between the step part 20152 and the third abutment part 206c of the washer member 2061, and the two are in a non-abutment state.

Referring to Figures 4a and 4b, Figure 4a is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the valve body 202 is just opened to the point where it is no longer loaded with the elastic force of the first elastic part 204, and Figure 4b is a local enlarged view of Figure 4a. Compared to the position of the valve body rotor unit 20 when the motor-operated valve of Figure 1 is fully closed, the position of the valve body rotor unit 20 in Figures 4a and 4b opens up by a certain height, and in this case, the valve body head 202a still abuts against the valve port 10a. With the rotor position in Figures 4a and 4b as the critical point, when the valve body rotor unit 20 continues to open up, the elastic force of the first elastic part 204 is transmitted by the washer member 2061 and loaded on the step portion 20152, and the valve body 202 is not loaded with the elastic load of the first elastic part 204.

In this specification, an example is described in which the pressure in the first inlet/outlet passage 10d is greater than the pressure in the second inlet/outlet passage 10e. Since there is a pressure difference on both sides of the valve port 10a, the valve body 202 is always subjected to a differential pressure due to the pressure difference, and the valve body 202 in Figures 4a and 4b is subjected to the differential pressure and its own gravity, causing its valve body head 202a to abut against the valve port 10a. For the motor-operated valve in the state of Figures 4a and 4b, there is an axial distance between the first valve body abutment part 202b and the second elastic part 208.

Referring to Figures 5a and 5b, Figure 5a is a cross-sectional view of the valve body when the motor-operated valve of the present invention is opened until the valve head does not contact the valve port, and Figure 5b is a local enlarged view of Figure 5a. From Figures 4a and 4b, the position of the valve rotor unit 20 in Figures 5a and 5b is opened to a certain height upward, and in this case, the valve head 202a is in a critical state of contacting and not contacting the valve port 10a. Under the action of the differential pressure between both ends of the valve port 10a and its own gravity, the valve body 202 is supported by the second elastic part 208, and under the action of the gravity of the valve body 202 and the differential pressure received by the valve body 202, the second elastic part 208 is distorted to a certain degree. In this case, the first valve body abutment part 202b abuts against the upper end of the second elastic part 208, the lower end of the second elastic part 208 abuts against the valve shaft abutment part 20154, the third abutment part 206c of the washer member 2061 abuts against the step part 20152, and the elastic force of the first elastic part 204 is transmitted by the washer member 2061 and is applied to the step part 20152. There is an axial distance h between the second valve body abutment part 202c and the second abutment part 206b, and h>0.

Continuing to refer to Figures 5a and 5b, when the third contact portion 206c contacts the step portion 20152 and the first valve body contact portion 202b contacts the second elastic part 208, there is an axial distance h between the second valve body contact portion 202c and the washer member 2061. In this case, there is an axial distance between the second valve body contact portion 202c and the second contact portion 206b, and the second valve body contact portion 202c contacts the washer member 2061. , the elastic force of the first elastic part 204 is applied to the step 20152 by the washer member 2061, and the second valve body abutment part 202c does not receive the elastic load of the first elastic part 204 due to the transmission of the washer member 2061, that is, the valve body 202 does not receive the elastic load of the first elastic part 204, and in this case, the valve body 202 is supported by the second elastic part 208 and suspended.

Referring to Figures 6a and 6b, Figure 6a is a cross-sectional view of the valve body when the motor-operated valve of the present invention is opened to the maximum opening degree, and Figure 6b is a local enlarged view of Figure 6a. The valve body rotor unit 20 of the motor-operated valve opens from the position of Figures 5a and 5b to the position of Figures 6a and 6b, and its valve body 202 is always subjected to the differential pressure between both ends of the valve port 10a and its own gravity, its first valve body abutment part 202b is always abutted against the upper end of the second elastic part 208, and the elastic force of the first elastic part 204 is transmitted by the washer member 2061 and is always loaded on the step part 20152. When it is in the position of Figures 6a and 6b, the rotor member 20 opens to the maximum opening degree position in the normal operating state.

The motor-operated valve of the present application further includes a restricting portion 20b, and the valve body 202 further includes a third valve body abutment portion 202d, and the restricting portion 20b can abut against the third valve body abutment portion 202d. In this embodiment, the third valve body abutment portion 202d is located at the upper end of the valve body main body portion 2021 and can abut against the housing 30, and the housing 30 includes the restricting portion 20b. For example, in the motor-operated valve of Figures 6a and 6b, the valve body 202 has just come into contact with the housing 30.

7a and 7b, FIG. 7a is a cross-sectional view of the valve body when the motor-operated valve of the present invention is over-opened until the screw pair is unscrewed, and FIG. 7b is a local enlarged view of FIG. 7a. When the valve body rotor unit 20 continues to open upward from the state of FIG. 6a and 6b, it becomes over-opened, and over-opening is a state in which the valve body rotor unit 20 opens upward until it exceeds a predetermined upper limit stroke. In the over-open state, as the valve body rotor unit 20 continues to move upward, the second elastic part 208 is compressed, and in FIG. 7a and 7b, the further compressed compression amount of the second elastic part 208 is m with respect to the state of FIG. 6a and 6b, and the third valve body abutment part 202d has already abutted against the housing 30, i.e., abutted against the limit part 20b, and the valve stem unit 201 is subjected to the downward elastic load of the second elastic part 208. When the valve disc rotor unit 20 is opened further too far, the male threaded portion 201a of the valve stem unit 201 and the female threaded portion 10b of the nut 102 are unscrewed (i.e., the state of Figures 7a and 7b). After unscrewing, the valve disc rotor unit 20 does not move upward. When the coil 40 drives the valve disc rotor unit 20 in the closing direction of the motor valve, the valve stem unit 201 receives the downward elastic load of the second elastic part 208, so that when the valve disc rotor unit 20 rotates, the screw pair is screwed again.

Combining Figures 1, 4a, 4b, 5a, 5b and 6a, 6b, when the valve body rotor unit 20 goes from a fully closed state to a fully open state, opens upward from the open state of Figures 4a, 4b, or closes from the fully open state of Figures 6a, 6b to the state of Figures 4a, 4b, the valve body 202 is not subjected to the spring force load of the first elastic part 204. In particular, at the moment of contact between the valve body head 202a and the valve orifice 10a, the valve body 202 is suspended by the second elastic part 208 and is not subjected to the elastic load of the first elastic part 204, reducing the impact force at the moment of contact between the valve body head 202a and the valve orifice 10a, reducing wear at the contact points between the two and extending the service life of the motor-operated valve; and during this period, reducing the frictional force at the contact points between the two (this frictional force is related to the pressure of the valve body 202 against the valve orifice 10a), reducing wear of the valve body 202 and the valve orifice 10b.

Referring to Figures 6a and 6b, in this embodiment, the structural features that can achieve the above-mentioned functional effects are as follows: when the washer member 2061 abuts against the step portion 20152, the valve body 202 does not abut against the valve port 10a, and the valve body 202 is supported by the second elastic part 208 and suspended, there is an axial distance h between the second valve body abutment portion 202c and the second abutment portion 206b of the washer member 2061. The motor-operated valve has a certain opening stroke, and preferably, h is less than 0.3 mm.

Referring to Figures 8a and 8b, Figure 8a is a cross-sectional view of the valve body when the second embodiment of the motor-operated valve of the present invention is opened to the maximum opening degree, and Figure 8b is a local enlarged view of Figure 8a. Compared with the first embodiment in Figures 6a and 6b at the same opening degree state, the main difference of this embodiment is that the valve body 202 has an integrally processed structure and is inserted from the top to the bottom into the central through hole of the valve shaft 2011. In this embodiment, when the washer member 2061 still abuts against the step portion 20152 and the valve body 202 does not abut against the valve port 10a and the valve body 202 is supported by the second elastic part 208 and suspended, there is an axial distance h between the second valve body abutment portion 202c and the second abutment portion 206b of the washer member 2061.

Referring to Figures 9a and 9b, Figure 9a is a cross-sectional view of the valve body when the third embodiment of the motor-operated valve of the present invention is opened to the maximum opening degree, and Figure 9b is an enlarged view of a local area of Figure 9a.

The abutment member 206 provided in this embodiment includes an abutment holder 2062, which can abut against the valve shaft abutment portion 20154, has a generally cylindrical structure, includes an abutment holder ceiling portion 20621 located at the ceiling portion, and an abutment holder side portion 20622 formed to extend downwardly along the circumferential edge of the abutment holder ceiling portion 20621, and the abutment holder side portion 20622 is hollow.

The abutment holder 2062 further includes abutment holder hole 20623, which penetrates the upper and lower surfaces of the abutment holder ceiling 20621, and the upper end of the valve body 202 penetrates the abutment holder hole 20623, the first elastic component 204, and the bush hole 20121.

In addition, in this embodiment, the step portion 20152 may not be provided on the valve shaft inner wall portion 2015. Specifically, when the motor-operated valve is in the state shown in Figures 9a and 9b, the valve body 202 is supported and suspended by the second elastic part 208, the first valve body abutment portion 202b abuts against the second elastic part 208, the abutment holder 2062 is fitted onto the valve body 202, and the lower end of the abutment holder side portion 20622 abuts against the valve shaft abutment portion 20154 (therefore, the step portion 20152 does not need to be provided, and the function of the step portion 20152 is realized by the valve shaft abutment portion 20154). The abutment holder 2062 includes a third abutment portion 206c, which is the portion that abuts against the valve shaft abutment portion 20154, and the abutment holder ceiling portion 20621 abuts against the first elastic part 204, and the abutment holder 2062 includes a first abutment portion 206a. In this embodiment, when the abutment holder 2062 abuts against the valve shaft abutment portion 20154, the valve body 202 is not abutted against the valve port 10a, and the valve body 202 is suspended and supported by the second elastic part 208, there is an axial distance h between the second valve body abutment portion 202c and the lower surface of the abutment holder ceiling portion 20621.

When the valve body 202 rises by a distance h relative to the valve stem unit 201, the lower end surface of the abutment holder ceiling portion 20621 comes into contact with the second valve body abutment portion 202c, and the first valve body abutment portion 202b does not abut against the second elastic part 208. When the valve body 202 rises further relative to the valve stem unit 201, the second abutment portion 206b of the abutment holder 2062 abuts against the second valve body abutment portion 202c, and the valve body 202 receives the elastic load of the first elastic part 204 through the transmission of the abutment holder 2062. In this case, the elastic force of the first elastic part 204 is transmitted to the valve port 10a by the valve body 202, generating a clamping force between the valve body 202 and the valve port 10a.

Of course, in this embodiment, a configuration in which the step portion 20152 is not provided is adopted, but for the present application, the step portion 20152 is not necessarily incapable of being arranged. For example, the step portion 20152 can be arranged on the valve shaft inner wall portion 2015, and the step portion 20152 can abut against the lower end of the abutment holder side portion 20622, and even in this case, the technical effect of the present application can be realized.

Referring to Figures 10a and 10b, Figure 10a is a cross-sectional view of the valve body when the fourth embodiment of the motor-operated valve of the present invention is opened to the maximum opening degree, and Figure 10b is an enlarged view of a local area of Figure 10.

In this embodiment, the valve stem unit 201 includes a valve stem main body portion 2013 and a tubular part 2014, the valve stem main body portion 2013 has a through hole that penetrates vertically, a male thread portion 201a is provided on the valve stem main body portion 2013, the valve stem main body portion 2013 is fixed and connected to the tubular part 2014, and a valve stem inner wall portion 2015 is formed in the approximate inner wall region of the central through hole after the two are fixed and connected, and in this embodiment, the upper end portion of the valve stem main body portion 2013 enters the through hole of the tubular part 2014, although of course, a form in which the valve stem main body portion 2013 does not enter the through hole of the tubular part 2014 and is fixed to the lower end of the tubular part 2014 may also be adopted. The tubular part 2014 has a generally hollow cylindrical shape and includes a tubular part abutment portion 20141, which abuts against the first elastic part 204. In this case, the tubular part abutment portion 20141 includes a spring abutment portion 20a, and a tubular part through-hole portion 201411 is provided at the approximate center position of the tubular part abutment portion 20141. The upper end surface of the valve shaft main body portion 2013 forms the valve shaft abutment portion 20154, and the first elastic part 204 is housed in a space defined by the tubular part 2014 and the valve shaft main body portion 2013.

Compared with the third embodiment in Figures 9a and 9b in the same opening state, this embodiment is based on the third embodiment and involves division and alignment changes to the structure of the valve stem unit 201. After assembly, the functions of the geometrically corresponding parts are the same. The structural solutions of other parts of this embodiment are the same or similar to those of the third embodiment.

In this embodiment, some parts of the motor-operated valve may be modified in the usual manner, such as by dividing or aligning them, but after assembly, the functions of the geometrically corresponding parts are basically the same and still fall within the concept of the present invention. For example, compared to the structure of the valve body 202 in the first embodiment of Figures 6a and 6b, the structure of the valve body 202 in Figures 8a and 8b has undergone certain modifications, but essentially the functions of the geometrically corresponding parts have not been changed, and these adaptive modifications and combinations of structures also fall within the scope of protection of the claims of the present invention patent.

In addition, in the examples of this specification, a washer may be attached to the lower end of the first elastic part 204, or a washer may be provided between the first valve body abutment part 202b and the second elastic part 208, or a washer may be attached to the upper end of the first elastic part 204, and this does not affect the central content of this application, and the abutment of two members in this application includes direct abutment of the two members, or abutment of each member by another member (not limited to a washer).

In addition, in order to further reduce the frictional resistance of the relative rotation of the upper and lower surfaces of the washer or gasket that engage under rotational friction, the surfaces are painted or plated with a coating layer that has lubricating and wear-resistant properties (for example, a coating layer containing polytetrafluoroethylene, graphite, or molybdenum disulfide components), thereby extending the service life of the motor-operated valve.

The term "abutment" as used in this application includes direct abutment between two members, as well as abutment between two members by another member, i.e., indirect abutment.

Based on the above embodiment, any adaptive modification to the attachment of anti-friction washers or gaskets according to the core structure of the present invention falls within the scope of protection of the claims of the present invention patent.

In the above embodiment, the third valve body abutment portion 202d of the valve body 202 is abutted against the housing 30. In this case, the housing 30 includes the limiting portion 20d. Of course, a housing connection part may be welded to the housing 30, and the valve body 202 can abut against the housing connection part. In this case, the member that abuts against the valve body 202 is the limiting portion 20d. In other words, the limiting portion 20d in this application is a member that can abut against the valve body 202, and is not limited to the housing 30.

Here, the present solution provides a variety of solutions for the above-mentioned valve port 10a formation method and the need to install a connecting pipe, and the description uses the annotation "possible", so "possible" in this application cannot be understood as "necessary".

Here, all directional nouns such as up, down, left, and right mentioned in this embodiment are introduced for the purpose of description based on the drawings in the specification, and ordinal terms such as "first" and "second" in the names of components are also introduced for the purpose of description and are not limitations on the order of components.

The above is a detailed introduction to the motor-operated valve provided by the present invention. This specification uses specific examples to describe the principles and embodiments of the present invention, and the explanation of the above examples is only for understanding the central idea of the present invention. Those skilled in the art may make some improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

10 ... valve seat member;
101 ... valve seat;
102 ... Nut;
103...first joint pipe section;
104...Second joint pipe section;
10a...valve port;
10b . . . female thread portion;
10c ...Fixed stopper portion;
10d . . . first entrance/exit passage;
10e . . . second entrance/exit passage;
20... Valve body rotor unit;
201 ... Valve stem unit;
2011...Valve stem;
2012 ... Bush;
20121 ... bush hole portion;
2013 ... Valve stem main body;
2014 ... Cylindrical parts;
20141 ... Cylindrical part abutment portion;
201411 ... Cylindrical part through hole portion;
2015...Inner wall of valve stem;
20151...First valve shaft inner wall part;
20152 ... step section;
20153...Second valve shaft inner wall part;
20154 ... Valve shaft contact part;
20155...Third valve shaft inner wall part;
2016 ...Outer edge;
20161 ... First outer edge portion;
20162 ...Second outer edge portion;
201a ... male thread portion;
201b ... Movable stopper part;
201c...rotor fixing part;
202 ... Valve body;
2021 ... Valve body main body;
2022 ... Valve body sleeve;
20221 ... Valve body sleeve hole portion;
202a ... valve body head;
202b...first valve body contact part;
202c...Second valve body contact part;
202d...Third valve body contact part;
203 ... rotor;
204 ...first elastic part;
206 ...Abutment member;
206a...first contact part;
206b...second contact part;
206c...Third contact part;
2061 ... Washer member;
20611 ... Washer hole;
2062 ...Abutment holder;
20621 ...Abutment holder ceiling part;
20622 ...Abutment holder side;
20623 ...Abutment holder hole portion;
208 ...Second elastic part;
20a ... spring abutment portion;
20b ...restriction part;
30...Housing;
40...Coil.

Claims (12)

An electrically operated valve, comprising a valve body and a coil (40), the coil (40) being fitted onto the valve body, the valve body comprising a valve seat member (10) and a valve body rotor unit (20), the valve body rotor unit (20) comprising a valve stem unit (201), a valve body (202), a first elastic part (204), a contact member (206) and a second elastic part (208),
The valve shaft unit (201) includes a valve shaft abutment portion (20154), and the second elastic part (208) is supported by the valve shaft abutment portion (20154),
The valve body (202) includes a first valve body abutment portion (202b) that is bored in the valve stem unit (201) and is abuttable against an upper end portion of the second elastic part (208);
an upper end of the first elastic part (204) abuts against the valve stem unit (201), the abutment member (206) includes a first abutment portion (206a), a lower end of the first elastic part (204) abuts against the first abutment portion (206a), the abutment member (206) includes a second abutment portion (206b), the valve body (202) includes a second valve body abutment portion (202c) that can abut against the second abutment portion (206b), and the abutment member (206) includes a third abutment portion (206c) that can abut against the valve stem unit (201);
The valve seat member (10) includes a valve port (10a) that is capable of abutting against the valve body (202),
An electric valve characterized in that when the third abutment portion (206c) abuts against the valve stem unit (201) and the first valve body abutment portion (202b) abuts against the upper end of the second elastic part (208), the second abutment portion (206b) is not abutted against the second valve body abutment portion (202c). The electric valve of claim 1, characterized in that the abutment member (206) includes a washer member (2061), the valve stem unit (201) includes a valve stem inner wall portion (2015) which includes a step portion (20152), the washer member (2061) abuts against the first elastic part (204) and includes the first abutment portion (206a), the washer member (2061) is capable of abutting against the second valve body abutment portion (202c) and includes the second abutment portion (206b), and the washer member (2061) is capable of abutting against the step portion (20152) and includes the third abutment portion (206c). The motor-operated valve according to claim 2, characterized in that the washer member (2061) further includes a washer hole (201611), and the valve body (202) penetrates the washer hole (201611) and the first elastic part (204). The motor-operated valve according to claim 1, characterized in that the abutment member (206) includes an abutment holder (2062), the abutment holder (2062) includes an abutment holder ceiling portion (20621) and an abutment holder side portion (20622), the abutment holder ceiling portion (20621) is abutted against the first elastic part (204) and includes the first abutment portion (206a), the abutment holder ceiling portion (20621) can abut against the second valve body abutment portion (202c), the abutment holder ceiling portion (20621) includes the second abutment portion (206b), the abutment holder side portion (20622) can abut against the valve stem unit (201), and includes the third abutment portion (206c). The motor-operated valve according to claim 4, characterized in that the abutment holder side portion (20622) can abut against the valve shaft abutment portion (20154). The motor-operated valve according to any one of claims 4 and 5, characterized in that the abutment holder (2062) includes an abutment holder hole portion (20623), and the valve body (202) passes through the abutment holder hole portion (20623) and the first elastic part (204). The motor-operated valve according to any one of claims 1 to 6, characterized in that the valve body (202) further includes a valve body main body (2021) and a valve body sleeve (2022), the valve body sleeve (2022) includes a valve body sleeve hole (20221), a part of the valve body main body (2021) is located in the valve body sleeve hole (20221), and the valve body main body (2021) is fixedly connected to the valve body sleeve (2022). The motor-operated valve according to claim 7, characterized in that the valve body sleeve (2022) can abut against the upper end of the second elastic part (208), the valve body sleeve (2022) includes the first valve body abutment portion (202b), can abut against the second abutment portion (206b), and the valve body sleeve (2022) includes the second valve body abutment portion (202c). The motor-operated valve according to any one of claims 1 to 5, characterized in that the valve shaft unit (201) includes a valve shaft (2011) and a bush (2012), the bush (2012) is fixedly connected to the valve shaft (2011) and abuts against the first elastic part (204), includes a bush hole portion (20121), and the valve body (202) passes through the bush hole portion (20121). The motor-operated valve according to any one of claims 1 to 5, characterized in that the valve stem unit (201) includes a valve stem main body (2013) and a tubular part (2014), the valve stem main body (2013) is fixedly connected to the tubular part (2014), the tubular part (2014) includes a tubular part abutment part (20141) that abuts against the first elastic part (204), the tubular part (2014) further includes a tubular part through-hole part (201411), and the valve body (202) passes through the tubular part through-hole part (201411). The motor-operated valve according to claim 10, characterized in that the motor-operated valve includes a restriction portion (20b) and a housing (30), the valve body (202) includes a third valve body abutment portion (202d) that is abuttable against the housing (30), and the housing ( 30 ) includes the restriction portion (20b). The motor-operated valve according to claim 10 or 11, characterized in that the motor-operated valve includes a restricting portion (20b), a housing (30) and a housing connection part, the housing connection part is fixedly connected to the housing (30), the valve body (202) includes a third valve body abutment portion (202d) that can abut against the housing connection part, and the housing connection part includes the restricting portion (20d).

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