Motor-operated valve

Abstract

The motor-operated valve includes a valve body, the valve body including a valve seat member (10) and a valve disc rotor unit (20). The valve disc rotor unit (20) includes a valve stem unit (201), a valve disc (202), first and second elastic parts (204 / 208), and an abutment member (206). The valve stem unit (201) includes a valve stem abutment portion (20154), the second elastic part (208) is supported by the valve stem abutment portion (20154), the valve disc (202) includes first and second valve disc abutment portions (202b / 202c), and is drilled into the valve stem unit (201). The first valve disc abutment portion (202b) is abuttable against the second elastic part (208). The first elastic part (204) is The abutment member (206) is in contact with the stem unit (201), and includes a first abutment portion (206a) that abuts against the first elastic component (204), a second abutment portion (206b) that can abut against the second valve body abutment portion (202c), and a third abutment portion (206c) that can abut against the stem unit (201). When the third abutment portion (206c) abuts against the stem unit (201) and the first valve body abutment portion (202b) abuts against the second elastic component (208), the second abutment portion (206b) does not abut against the second valve body abutment portion (202c), thereby reducing the impact force of the valve body (202) against the valve orifice (10a) at the moment of contact between the valve body (202) and the valve orifice (10a).

Description

[Technical field]

[0001] This application was filed with the China Patent Office on March 29, 2021, bearing application number 202110329751.8, and claims priority to a Chinese patent application for the invention "Motor-operated valve", the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of refrigeration control, and in particular to motorized valves. [Background technology]

[0003] 11, CN109723884A discloses an electric valve, which includes a guide bush 20 and a valve stem holder 30, the guide bush 20 is provided with a fixed male screw portion 23, the valve stem holder 30 is provided with a movable female screw portion 33, and the fixed male screw portion 23 and the movable female screw portion 33 constitute a screw feed mechanism 28 of the electric valve. The valve body of the electric valve is mainly composed of three parts.

[0004] A disk-shaped pressure plate 61 is arranged on the underside of the ceiling portion 32 of the valve stem holder 30 and is sandwiched 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 electric valve and the underside of the ceiling portion 32 of the valve stem holder 30. A compression coil spring (biasing member) 60 is compressed so as to be extrapolated onto the upper small diameter portion 11 of the valve stem 10, and urges the valve stem 10 in the vertical direction (direction of axis O) away from the valve stem holder 30. In other words, the compression coil spring (biasing member) 60 urges the valve stem 10 (valve body 14) downward (in the valve closing direction) at all times. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a motor-operated valve. [Means for solving the problem]

[0006] 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. Effect of the Invention

[0007] According to the motor-operated valve provided by the present application, when the third abutment portion abuts against the valve stem unit and the first valve body abutment portion abuts against the second elastic part, the second abutment portion does not abut against the second valve body abutment portion, and the valve body does not receive the elastic load of the first elastic part, thereby reducing the impact force of the valve body against the valve port at the moment of contact between the valve body and the valve port. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of the motor-operated valve of the present invention in a fully closed state. [Diagram 2] FIG. 2 is a structural schematic diagram of a valve seat member of the motor-operated valve of the present invention. [Figure 3a] 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. [Figure 4a]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 to the point where it is no longer bearing the elastic force of the first elastic component, and FIG. 4b is a local enlarged view of FIG. 4a. [Figure 5a] FIG. 5b is a cross-sectional view of the valve body of the motor-operated valve of the present invention when the valve body is opened until the valve head does not come into contact with the valve port, and FIG. 5b is a local enlarged view of FIG. 5a. [Figure 6a] 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. [Figure 7a] 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. [Figure 8a] 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. [Figure 9a] 9B is a cross-sectional view of the valve body when the motor-operated valve of 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. [Figure 10a] 10B is a cross-sectional view of the 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 locally enlarged view of FIG. 10A. [Figure 11] FIG. 1 is a cross-sectional view of a motor-operated valve according to the background art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail hereinafter in combination with drawings and specific embodiments.

[0010] 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 it is just opened until the valve body 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 until the valve body head is just not in contact with the valve orifice, 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 excessively opened until the screw pair is unscrewed, and FIG. 7b is a local enlarged view of FIG. 7a.

[0011] 1 to 3b, in one specific embodiment, the motor-operated 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 disc rotor unit 20 (FIGS. 3a and 3b), a valve seat member 10 (FIG. 2) and a housing 30 (FIG. 1).

[0012] Referring to FIG. 1, one end of the housing 30 is open. The housing 30 is a thin-walled member having an enclosure shape, and the open side of its lower end is hermetically welded to the valve seat member 10 to form an accommodation chamber that can accommodate the upper half of a nut 102 (described below) and the main body portion of a valve body rotor unit 20 (described below).

[0013] 3a and 3b, the valve body rotor unit 20 of the motor-operated valve includes a rotor 203 having magnetic poles in the circumferential direction, and a valve stem unit 201 fixedly 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 fixedly connected to the valve stem 2011 by a method such as press-fitting or welding, and includes a bush hole portion 20121 penetrating its upper and lower surfaces. The valve body rotor unit 20 further includes a valve body 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 portion 20151 (described below) of the valve shaft 2011, a second elastic part 208 provided in a second valve shaft inner wall portion 20153 (described below) of the valve shaft 2011, and an abutment member 206 provided in the first valve shaft inner wall portion 20151 of the valve shaft 2011.

[0014] 1, the coil 40 of the motor-operated valve is connected to a driving controller, and after being energized, the driving controller sends a pulse driving 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 an 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 switching adjustment function of the motor-operated valve flow rate.

[0015] Referring to FIG. 2, by 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, the valve port 10a is connected to the first inlet / outlet passage 10d and the second inlet / outlet passage 10e to allow a fluid medium (e.g., a refrigerant) to pass through, and 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, and 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 mechanism of the electric valve.

[0016] 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 in 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 together 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 together 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.

[0017] The nut 102 has a fixed stopper portion 10c protruding from the annular base, which 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; that is, 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 movement stroke of the valve body rotor unit 20.

[0018] In this embodiment, the valve orifice 10a is integrally formed with the valve seat 101, and 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 head 202a of the valve 202, and the valve seat 101 is fixed and connected to the first connecting pipe part 103 and the second connecting pipe part 104, which serve as inflow and outflow passages for the fluid medium of the motor-operated valve and are generally connected to a system pipe when installed in a cooling or heating system such as an air conditioner.

[0019] In this embodiment, the first connecting pipe part 103 and the second connecting pipe part 104 are welded and connected to the valve seat 101, but of course, the present invention may also adopt a form in which a flow path through which a 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 quick repair such as a car air conditioner or a heat pump, the first connecting pipe part 103, the second connecting pipe part 104 and the valve seat 101 may be sealed and connected by a flange. In this embodiment, the first connecting pipe part 103 and the second connecting pipe part 104 are welded and fixed to the valve seat 101 as an example.

[0020] 3a and 3b, in this embodiment, the stem 2011 includes a hole penetrating vertically, and the inner wall of the hole roughly forms a stem inner wall portion 2015. In the axial direction of the stem 2011, the inner diameter of the stem inner wall portion 2015 is not uniform. Specifically, the stem inner wall portion 2015 includes a first stem inner wall portion 20151, a step portion 20152, a second stem inner wall portion 20153, a stem abutment portion 20154 and a third stem inner wall portion 20155. In the axial direction of the motor-operated 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 third valve shaft inner wall portion 20155 along the plane (the orthogonal projection is a closed line or annular surface) 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 generally circular in cross section for ease of processing and manufacturing. 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 circular.

[0021] 3a and 3b, when the step 20152 and the stem abutment portion 20154 have a horizontal extension distance, the step 20152 is higher than the stem abutment portion 20154, its outer edge intersects with the first stem inner wall portion 20151, its inner edge intersects with the second stem inner wall portion 20153, the outer edge of the stem abutment portion 20154 intersects with the second stem inner wall portion 20153, and its inner edge intersects with the third stem inner wall portion 20155, and the cross sections of the first stem inner wall portion 20151, the second stem inner wall portion 20153, and the third stem inner wall portion 20155 are all circular, the step 20152 and the valve shaft abutment portion 20154, when projected orthogonally along the plane in which the cross section of the valve shaft 2011 is located, both exhibit a circular ring shape, and in this embodiment, the step portion 20152 and the valve shaft abutment portion 20154 are horizontal, of course, the step portion 20152 and the valve shaft abutment portion 20154 may be installed 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.

[0022] Of course, 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 has been described above, but 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. Between the inner wall portion 20151 and the second valve shaft inner wall portion 20153 there is one step portion 20152 having a horizontal extending distance, and between the second valve shaft inner wall portion 20153 and the third valve shaft inner wall portion 20155 there is one valve shaft abutment portion 20154 having a horizontal extending distance, the valve shaft abutment portion 20154 abutting against the valve body 202, and the step portion 20152 abutting against the abutment member 206.

[0023] 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 where the cross section of the valve shaft 2011 is located, the outer edge of the first outer edge portion 20161 orthogonally projected along the plane is located outside the outer edge of the second outer edge portion 20162 orthogonally projected 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 circularly configured. The first outer edge portion 20161, A rotor fixing part 201c is provided at a portion located at the valve shaft 2011, and the rotor 203 and the rotor fixing part 201c are fixed to each other by means of direct or indirect welding, crimping, injection connection with magnetic plastic material, bonding with adhesive, etc. In this embodiment, the connecting part is connected to the magnetic plastic material as an insert so as to be injected, and then fixed and connected to the valve shaft 2011 by means of welding. When the rotor 203 and the valve shaft 2011 are directly connected to each other, the valve shaft 2011 may also be connected to the magnetic plastic material as an insert so as to be injected.

[0024] A male thread portion 201a is provided on the second outer edge portion 20162, and the male thread portion 201a and a female thread portion 10b provided in the inner hole portion of the nut 102 are combined to form a screw feed mechanism (screw pair) of the motor-operated valve.

[0025] Referring to Figures 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, located in 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 Figures 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.

[0026] 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.

[0027] 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 portion 202a, which is located at approximately 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 202 is related to the required flow rate adjustment curve of the motor-operated valve.

[0028] 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 has not yet abutted against the second elastic part 208. Since there is an overlapping area between the orthogonal projection of the first valve body abutment portion 202b along the plane in which the cross section of the valve body 202 is located and the orthogonal projection of the second elastic part 208 along the plane in which the cross section of the valve body 202 is located, the first valve body abutment portion 202b can abut against the second elastic part 208, and of course, when 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 need to satisfy the above relationship.

[0029] 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.

[0030] 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 means of pressing, welding, or adhesive.

[0031] 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 2021 is inserted into the central through-hole of the valve shaft 2011 from bottom to top, and the valve body sleeve 2022 is fitted from top to bottom and fixed to the valve body main body 2021.

[0032] 3a and 3b, the valve rotor unit 20 of the motor-operated valve of this embodiment further includes a first elastic member 204, which is designed as a cylindrical coil spring and is located within the first valve shaft inner wall portion 20151.

[0033] 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 bushing 2012 and the first elastic part 204, the bushing 2012 still bears 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 bushing 2012 abuts against the first elastic part 204 and includes the spring abutment portion 20a.

[0034] The electric valve provided by the present application further includes an abutment member 206, which includes a first abutment portion 206a, and the lower end of the first elastic part 204 abuts against the first abutment portion 206a, the abutment member 206 further includes a second abutment portion 206b that can abut against the second valve body abutment portion 202c, and the abutment member 206 further includes a third abutment portion 206c that can abut against the valve shaft unit 201.

[0035] In this embodiment, the lower end surface of the valve body sleeve 2022 can abut against the second elastic part 208 (for example, the state of the electric valve in Figures 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, the state of Figures 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.

[0036] 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 portion of it located in the washer hole 20221.

[0037] With the above installation, when radial deviation is about to occur, the first elastic part 204 is restricted by the valve body 202, reducing the radial deviation, making the first elastic part 204 more stable within the valve stem unit 201, and extending the service life of the motor-operated valve.

[0038] 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 electric 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.

[0039] 3a and 3b, FIG. 1 is combined to show the state when the motor-operated valve is fully closed (i.e., the state when the valve disc rotor unit 20 is at the bottom end of its stroke). FIG. 1 is combined to show the state when the valve disc head 202a is in contact with and pressed against the valve orifice 10a, and the first elastic part 204 is in a compressed state. In this state, there is an axial distance between the first valve disc abutment portion 202b and the second elastic part 208, and the two are in a non-abutment state. The second valve disc abutment portion 202c is in contact with the second abutment portion 206b of the washer member 2061, and there is an axial distance between the step portion 20152 and the third abutment portion 206c of the washer member 2061, and the two are in a non-abutment state.

[0040] 4a and 4b, Fig. 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 bearing the elastic force of the first elastic part 204, and Fig. 4b is a local enlarged view of Fig. 4a. Compared with the position of the valve body rotor unit 20 when the motor-operated valve of Fig. 1 is fully closed, the position of the valve body rotor unit 20 in Fig. 4a and 4b opens upward 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 Fig. 4a and 4b as the critical point, when the valve body rotor unit 20 continues to open upward, the elastic force of the first elastic part 204 is transmitted by the washer member 2061 and is loaded on the step portion 20152, and the valve body 202 is not bearing the elastic load of the first elastic part 204.

[0041] In this specification, the pressure in the first inlet / outlet passage 10d is greater than the pressure in the second inlet / outlet passage 10e, and since there is a pressure difference between the two sides of the valve port 10a, the valve body 202 is always subjected to a differential pressure caused by the pressure difference, and the valve body 202 in Figures 4a and 4b is subjected to the differential pressure and its own gravity, so that its valve body head 202a abuts 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.

[0042] 5a and 5b, Fig. 5a is a cross-sectional view of the valve body when the motor-operated valve of the present invention is opened to the point where the valve head is not in contact with the valve port, and Fig. 5b is a local enlarged view of Fig. 5a. As shown in Fig. 4a and 4b, the position of the valve rotor unit 20 in Fig. 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 in contact with 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.

[0043] Continuing to refer to FIGS. 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 component 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 is in contact with the washer member 2061. The elastic force of the first elastic part 204 is applied to the step portion 20152 by the washer member 2061, and the second valve body abutment portion 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. In this case, the valve body 202 is supported by the second elastic part 208 and suspended.

[0044] 6a and 6b, Fig. 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 Fig. 6b is a partially enlarged view of Fig. 6a. The valve body rotor unit 20 of the motor-operated valve opens from the position of Fig. 5a and 5b to the position of Fig. 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, and 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 always loaded on the step part 20152. When it is in the position of Fig. 6a and 6b, the rotor member 20 opens to the maximum opening degree position in the normal operating state.

[0045] 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.

[0046] 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 means that the valve body rotor unit 20 opens upward until it exceeds a predetermined upper limit stroke. In the over-opened 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 compared 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 excessively, 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 Figs. 7a and 7b). After being unscrewed, 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 is subjected to the downward elastic load of the second elastic part 208. Therefore, when the valve disc rotor unit 20 rotates, the screw pair is screwed again.

[0047] 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 and 4b, or closes from the fully open state of Figures 6a and 6b to the state of Figures 4a and 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 from the second elastic part 208 and is not subjected to the elastic load of the first elastic part 204, thereby 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 them and extending the service life of the motor-operated valve; and during this period, reducing the frictional force at the contact points between them (the frictional force is related to the pressure of the valve body 202 against the valve orifice 10a) and reducing wear of the valve body 202 and the valve orifice 10b.

[0048] 6a and 6b, in this embodiment, the structural feature that can achieve the above-mentioned functional effect is 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 and suspended by the second elastic part 208, there exists 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.

[0049] 8a and 8b, Fig. 8a is a cross-sectional view of the valve body of the second embodiment of the motor-operated valve of the present invention when the valve body is opened to the maximum opening degree, and Fig. 8b is a local enlarged view of Fig. 8a. Compared with the first embodiment in Fig. 6a and 6b at the same opening degree, the main difference of this embodiment is that the valve body 202 is an integrally molded 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.

[0050] 9a and 9b, FIG. 9a is a cross-sectional view of a valve body of the third embodiment of the motor-operated valve of the present invention when the valve body is opened to the maximum opening degree, and FIG. 9b is a local enlarged view of FIG. 9a.

[0051] The abutment member 206 provided in this embodiment includes an abutment holder 2062 that can abut against the valve shaft abutment portion 20154, has an approximately cylindrical structure, and includes an abutment holder ceiling portion 20621 located at the ceiling portion, and an abutment holder side portion 20622 that is formed to extend downwardly roughly along the circumferential edge of the abutment holder ceiling portion 20621, and the abutment holder side portion 20622 is hollow.

[0052] The abutment holder 2062 further includes a contact holder hole 20623 that penetrates the upper and lower surfaces of the abutment holder ceiling portion 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 .

[0053] In addition, in this embodiment, the valve stem inner wall portion 2015 does not need to be provided with the step portion 20152. Specifically, when the motor-operated valve is in the state of Figs. 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 stem abutment portion 20154 (so that the step portion 20152 does not need to be provided, and the function of the step portion 20152 is realized by the valve stem abutment portion 20154). In this embodiment, The abutment holder 2062 includes a third abutment portion 206c, which is a 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 the 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 underside of the abutment holder ceiling portion 20621.

[0054] When the valve body 202 is raised 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 is not abutted against the second elastic part 208. When the valve body 202 is raised 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.

[0055] Of course, in this embodiment, a form is adopted in which the step portion 20152 is not provided, but this does not necessarily mean that the step portion 20152 cannot be arranged in the present application. 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. Even in this case, the technical effects of the present application can be realized.

[0056] 10a and 10b, FIG. 10a is a cross-sectional view of the valve body of the fourth embodiment of the motor-operated valve of the present invention when the valve body is opened to the maximum opening degree, and FIG. 10b is an enlarged view of a part of FIG.

[0057] In this embodiment, the stem unit 201 includes a stem main body 2013 and a tubular part 2014, the stem main body 2013 has a through hole penetrating vertically, a male thread portion 201a is provided on the stem main body 2013, and the stem main body 2013 is fixed and connected to the tubular part 2014, and a stem inner wall portion 2015 is formed in an approximately 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 stem main body 2013 fits into the through hole of the tubular part 2014, but of course, a form in which the stem main body 2013 does not fit into the through hole of the tubular part 2014 and is fixed to the lower end of the tubular part 2014 may be adopted. The tubular part 2014 has a generally hollow cylindrical shape and includes a tubular part abutting portion 20141. The tubular part abutting portion 20141 abuts against the first elastic part 204. In this case, the tubular part abutting portion 20141 includes a spring abutting portion 20a, and a tubular part through-hole portion 201411 is provided at a generally central position of the tubular part abutting portion 20141. The upper end surface of the valve stem main body portion 2013 forms a valve stem abutting portion 20154, and the first elastic part 204 is housed in a space defined by the tubular part 2014 and the valve stem main body portion 2013.

[0058] 9a and 9b in the same opening state, this embodiment is based on the third embodiment and the structure of the valve stem unit 201 is divided and aligned differently. 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.

[0059] In this embodiment, some components of the motor-operated valve may be modified in the usual manner, such as division, alignment, etc., 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 combination structures also fall within the scope of protection of the claims of the patent of the present invention.

[0060] In addition, in the embodiments 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 parts in this application includes direct abutment of the two parts, or abutment of each part by other parts (not limited to washers).

[0061] 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 having 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.

[0062] The term "abutment" as used in this application includes direct abutment between two members, as well as abutment between two members by another member, ie, indirect abutment.

[0063] Based on the above embodiment, according to the core structure of the present invention, any adaptive modification to the attachment of anti-friction washers or gaskets falls within the scope of protection of the present invention patent claims.

[0064] 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 abutting against the valve body 202 is the limiting portion 20d. That is, the limiting portion 20d in the present application is a member abuttable against the valve body 202, and is not limited to the housing 30.

[0065] Here, for the formation method of the above-mentioned valve port 10a and the need to install a connecting pipe, the present solution provides a variety of solutions, and the description uses the annotation "possible". Therefore, "possible" in this application should not be interpreted as "must".

[0066] 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 the components.

[0067] The above is a detailed introduction of the motor-operated valve provided by the present invention. This specification uses specific examples to describe the principle and embodiment of the present invention, and the description of the above examples is only for understanding the core idea of ​​the present invention. Those skilled in the art may make some improvements and modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. [Explanation of symbols]

[0068] 10 ···Valve seat member; 101 ···Valve seat; 102 ···nut; 103...first joint pipe section; 104...Second joint pipe section; 10a: Valve orifice; 10b Female thread portion; 10c Fixed stopper part; 10d: First entrance / exit; 10e: Second entrance / exit; 20 ···Valve body rotor unit; 201 ···Valve stem unit; 2011 ···Valve shaft; 2012 ···Bush; 20121 ···Bush hole; 2013 ···Valve stem body; 2014 ···Cylindrical parts; 20141 ···Cylindrical part abutment portion; 201411 ···Through hole of cylindrical part; 2015...Inner wall of valve stem; 20151...First valve shaft inner wall; 20152 ···Danbe; 20153...Second valve stem inner wall; 20154...Valve shaft contact part; 20155...Third valve stem inner wall; 2016 ···Outer edge; 20161 ···First outer edge; 20162 ···Second outer edge; 201a ··· Male thread portion; 201b ··· Movable stopper part; 201c Rotor fixing part; 202 ···Valve body; 2021 ···Valve body; 2022 ···Valve body sleeve; 20221 ···Valve 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 component; 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 contact portion; 20b: Restriction section; 30 ···Housing; 40···coil.

Claims

1. 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 abuttable 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).

2. 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) and the valve stem inner wall portion (2015) includes a step portion (20152), the washer member (2061) is abutted against the first elastic part (204) and includes the first abutment portion (206a), the washer member (2061) is abuttable against the second valve body abutment portion (202c) and includes the second abutment portion (206b), and the washer member (2061) is abuttable against the step portion (20152) and includes the third abutment portion (206c).

3. The motor-operated valve as described in claim 2, characterized in that the washer member (2061) further includes a washer hole portion (201611), and the valve body (202) penetrates the washer hole portion (201611) and the first elastic part (204).

4. The electric valve of 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) is capable of abutting against the second valve body abutment portion (202c), the abutment holder ceiling portion (20621) includes the second abutment portion (206b), and the abutment holder side portion (20622) is capable of abutting against the valve stem unit (201) and includes the third abutment portion (206c).

5. The motor-operated valve according to claim 4, characterized in that the abutment holder side portion (20622) is capable of abutting against the valve shaft abutment portion (20154).

6. An electric valve as described in any one of claims 4 or 5, characterized in that the abutment holder (2062) includes an abutment holder hole portion (20623), and the valve body (202) penetrates the abutment holder hole portion (20623) and the first elastic part (204).

7. The electric valve according to any one of claims 1 to 6, characterized in that the valve body (202) further includes a valve body main body portion (2021) and a valve body sleeve (2022), the valve body sleeve (2022) includes a valve body sleeve hole portion (20221), a portion of the valve body main body portion (2021) is located in the valve body sleeve hole portion (20221), and the valve body main body portion (2021) is fixedly connected to the valve body sleeve (2022).

8. The motor-operated valve according to claim 7, characterized in that the valve body sleeve (2022) is abuttable against the upper end of the second elastic part (208), the valve body sleeve (2022) includes the first valve body abutment portion (202b) and is abuttable against the second abutment portion (206b), and the valve body sleeve (2022) includes the second valve body abutment portion (202c).

9. 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 electric valve described in 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).

10. 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 portion (2013) and a tubular part (2014), the valve stem main body portion (2013) is fixedly connected to the tubular part (2014), the tubular part (2014) includes a tubular part abutment portion (20141) that abuts against the first elastic part (204), the tubular part (2014) further includes a tubular part through-hole portion (201411), and the valve body (202) passes through the tubular part through-hole portion (201411).

11. 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).

12. The motor-operated valve according to claim 10 or 11, characterized in that the motor-operated valve includes a restriction portion (20b), a housing (30) and a housing connection part, the housing connection part being fixedly connected to the housing (30), the valve body (202) including a third valve body abutment portion (202d) that is abuttable against the housing connection part, and the housing connection part including the restriction portion (20d).

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