Electric valve

Abstract

The utility model provides an electric valve. The electric valve comprises a screw rod; the valve seat assembly is provided with a valve port, a first channel and a second channel; the valve needle assembly is connected with the lower portion of the lead screw, and the lead screw can drive the valve needle assembly to move along the axis so as to open and close the valve port; the positioning plate comprises a positioning plate body, a mounting hole penetrating through the positioning plate body and a first stopping part protruding out of the bottom face of the positioning plate body, and the upper portion of the lead screw penetrates through and is fixedly mounted in the mounting hole of the positioning plate; the rotor is fixedly installed on the outer side of the positioning plate, and the rotor drives the lead screw to rotate together through the positioning plate; a threaded hole is formed in the nut assembly, and the lead screw penetrates through the threaded hole and is in threaded fit with the threaded hole; and the connecting plate is fixedly connected between the inner side of the rotor and the positioning plate, and the connecting plate is located on the top surface of the positioning plate body. Therefore, the assembly accuracy can be greatly improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of flow regulating valves, in particular to an electric valve. [Background technology]

[0002] At present, electric valves driven by motors have been widely used in refrigeration systems. Existing electric valves mainly include: valve body, valve seat, stator, rotor, transmission structure (such as screw nut structure), and valve needle are arranged in the valve body; the stator drives the rotor, and the transmission structure converts the rotational motion of the rotor into linear motion, thereby driving the valve needle to engage or disengage with respect to the valve seat, thereby adjusting the flow area of ​​the valve port, and then adjusting the refrigerant flow into the evaporator.

[0003] Please refer to the invention patent application document with application publication number CN114763842A, which is an electronic expansion valve, whose stopper is arranged on the connecting piece, which means that the stopper and the magnetic rotor are an integrated structure, and the magnetic rotor is arranged on the periphery of the stopper, so during installation, it is impossible to use tooling to assist in positioning the contact of the stopper, and the axial contact surface of the stopper to the magnetic rotor is very small, and it is impossible to reliably position it in the natural state. This makes assembly difficult and the qualified rate low.

[0004] Therefore, it is necessary to propose a new technical solution to solve the above problems. [Contents of the utility model]

[0005] One of the purposes of the utility model is to provide an electric valve, which can greatly improve the assembly accuracy.

[0006] According to one aspect of the utility model, the utility model provides an electric valve, which includes: a screw rod; a valve seat assembly, which is provided with a valve port, a first channel and a second channel, when the valve port is opened, the first channel is connected to the second channel through the valve port, and when the valve port is closed, the first channel is disconnected from the second channel; a valve needle assembly, which is connected to the lower part of the screw rod, and the screw rod can drive the valve needle assembly to move along the axis to open and close the valve port; a positioning plate, which includes a positioning plate body, a mounting hole penetrating the positioning plate body, and a mounting hole protruding from the positioning plate body. A first stopper on the bottom surface of the positioning plate body, wherein the upper portion of the screw rod passes through and is fixedly mounted in the mounting hole of the positioning plate; a rotor, which is fixedly mounted on the outer side of the positioning plate, and the rotor drives the screw rod to rotate together through the positioning plate; a nut assembly, which is mounted on the valve seat assembly and is located below the positioning plate, a threaded hole is formed in the nut assembly, the screw rod passes through the threaded hole and is threadedly engaged with the threaded hole; a connecting plate, which is fixedly connected between the inner side of the rotor and the positioning plate, and the connecting plate is located on the top surface of the positioning plate body.

[0007] Compared with the prior art, in the electric valve provided by the utility model, a stop structure is provided on the positioning plate, and the positioning plate, the connecting plate and the rotor are separate. The positioning plate can be installed first, and then the rotor and the positioning plate are fixedly connected by the connecting plate, which can greatly improve the assembly accuracy.

Brief Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0009] Figure 1 It is a front cross-sectional schematic diagram of an electric valve in a closed state in one embodiment of the utility model;

[0010] Figure 2 In one embodiment of the present invention, Figure 1 The structural schematic diagram of the positioning plate shown in the first viewing angle;

[0011] Figure 3 In one embodiment of the present invention, Figure 1 The structural schematic diagram of the positioning plate shown in the second viewing angle;

[0012] Figure 4 In one embodiment of the present invention, Figure 1 The structural schematic diagram of the nut assembly shown is in the first perspective;

[0013] Figure 5 In one embodiment of the present invention, Figure 1 The structural schematic diagram of the nut assembly shown in the second viewing angle;

[0014] Figure 6 In one embodiment of the present invention, Figure 1 The relative position state diagram of the positioning plate and the nut assembly when the valve port is closed is shown;

[0015] Figure 7 In one embodiment of the present invention, Figure 1 The diagram shows the relative positions of the positioning plate and nut assembly from closing the valve port to the screw rod rising one circle. [Specific implementation method]

[0016] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words "connected", "connected" and "connected" herein that indicate electrical connection all refer to direct or indirect electrical connection.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] Please refer to Figure 1 As shown, it is a front cross-sectional schematic diagram of an electric valve in a closed state in one embodiment of the utility model. Figure 1 The electric valve shown includes a valve seat assembly 110 , a screw rod 120 , a valve needle assembly 130 , a positioning plate 140 , a rotor 150 , a nut assembly 160 and a connecting plate 170 .

[0020] The valve seat assembly 110 is provided with a valve port 112, a first channel 114 and a second channel 116. When the valve port 112 is opened, the first channel 114 is connected to the second channel 116 through the valve port 112, and when the valve port 112 is closed, the first channel 114 is disconnected from the second channel 116. The valve needle assembly 130 is connected to the lower part of the screw rod 120, and the screw rod 120 can drive the valve needle assembly 130 to move along the axis to open and close the valve port 112. The rotor 150 is fixedly mounted on the outer side of the positioning plate 140, and the rotor 150 drives the screw rod 120 to rotate together through the positioning plate 140.

[0021] Please refer to Figure 2 As shown, the utility model is in one embodiment as Figure 1 The schematic diagram of the structure of the positioning plate 140 in the first viewing angle is shown in FIG. Figure 3 As shown, the utility model is in one embodiment as Figure 1 The shown structure diagram of the positioning plate 140 at a second viewing angle. Figure 2 and Figure 3The positioning plate shown includes a positioning plate body 142, a mounting hole 144 penetrating the positioning plate body 142, and a first stopper 146 protruding from the bottom surface of the positioning plate body 142. The upper portion of the screw rod 120 passes through and is fixedly mounted in the mounting hole 144 of the positioning plate 140.

[0022] Please refer to Figure 4 As shown, the utility model is in one embodiment as Figure 1 The schematic diagram of the structure of the nut assembly 160 in the first perspective is shown in FIG. Figure 5 As shown, the utility model is in one embodiment as Figure 1 The nut assembly 160 is a schematic structural diagram of the second viewing angle. Figure 1 , Figure 4 and Figure 5 It can be seen that the nut assembly 160 is fixedly installed on the valve seat assembly 110 and is located below the positioning plate 140. A threaded hole 162 is formed in the nut assembly 160. The screw rod 120 passes through the threaded hole 162 and is threadedly engaged with the threaded hole 162. When the screw rod 120 rotates in the threaded hole 162 along a first direction (i.e., the valve closing direction), the screw rod 120 moves downward along the axis to drive the valve needle assembly 130 to close the valve port 112. When the screw rod 120 rotates in the threaded hole 162 along the first direction (i.e., the valve closing direction), the screw rod 120 moves downward along the axis to drive the valve needle assembly 130 to close the valve port 112. When rotating in the opposite second direction (i.e., the valve opening direction), the screw rod 120 moves upward along the axis to drive the valve needle assembly 130 to open the valve port 112, wherein a protruding second stop portion 164 is formed on the top surface of the nut assembly 160, and when the screw rod 120 drives the valve needle assembly 130 to close the valve port 112 (i.e., when the valve is in the fully closed position), the second stop portion 164 abuts (or contacts) the first stop portion 146 to prevent the first stop portion 146 from further rotating in the first direction.

[0023] Figure 1 The connecting plate 170 shown is fixedly connected between the inner side of the rotor 150 and the positioning plate 140, and the connecting plate 170 is located on the top surface of the positioning plate body 142; the connecting plate 170 and the rotor 150 are integrally fixed by injection molding, and are separate from the positioning plate 140. The positioning plate 140 is first fixedly connected to the screw rod 120, and then the positioning plate 140 and the rotor 150 are fixedly connected through the connecting plate 170.

[0024] exist Figure 2In the illustrated embodiment, the first stopper 146 protruding from the bottom surface of the positioning plate body 142 includes a protruding surface 1462, a first sloped surface 1464 located on one side of the protruding surface 1462, and a first stopper surface 1466 located between the protruding surface 1462 and the first sloped surface 1464. The protruding surface 1462 is substantially parallel to the bottom surface of the positioning plate body 142, the first stopper surface 1466 is substantially perpendicular to the bottom surface of the positioning plate body 142, the first sloped surface 1464 is inclined from the first stopper surface 1466 to the bottom surface of the positioning plate body 142, and the protruding surface 1462 is farther from the bottom surface of the positioning plate body 142 than the first sloped surface 1464 and the first stopper surface 1466.

[0025] exist Figure 2 In the specific embodiment shown, the first stop portion 146 protruding from the bottom surface of the positioning plate body 142 also includes a second slope surface 1468, which is located on the other side of the protruding surface 1462; the second slope surface 1468 is inclined from the protruding surface 1462 to the bottom surface of the positioning plate body 142, wherein the protruding surface 1462 is farther from the bottom surface of the positioning plate body 142 than the second slope surface 1468.

[0026] exist Figure 4 and Figure 5 In the illustrated embodiment, the top surface 1642 of the second stop portion 164 is an inclined surface, and the top surface 1642 of the second stop portion 164 is inclined from a side surface 1644 of the second stop portion 164 toward the top surface of the nut assembly 160 .

[0027] Please refer to Figure 6 As shown, the utility model is in one embodiment as Figure 1 The relative position state diagram of the positioning plate 140 and the nut assembly 160 when the valve port 112 is closed is shown. Specifically, when the screw rod 120 drives the valve needle assembly 130 to close the valve port 112, the first stop surface 1466 of the first stop portion 146 abuts (or contacts) a side surface (which may be referred to as the second stop surface) 1644 of the second stop portion 164 to prevent the first stop portion 146 from further rotating in the first direction.

[0028] Please refer to Figure 7 As shown, the utility model is in one embodiment as Figure 1 The relative position state diagram of the positioning plate 140 and the nut assembly 160 from closing the valve port to the screw rod 120 rising one circle is shown. Specifically, when the screw rod 120 drives the valve needle assembly 130 to close the valve port 112, if the screw rod 120 moves in the threaded hole 162 along the second direction (such as Figure 6After the screw rod 120 rotates one circle in the threaded hole 162 along the arrow direction shown in the figure), there is a gap (or clearance) between the protruding surface 1462 of the first stopper 146 and the top surface of the second stopper 164. In other words, from the time when the first stopper surface 1466 of the first stopper 146 abuts against the side surface 1644 of the second stopper 164 until the screw rod 120 rotates one circle in the threaded hole 162 along the second direction, the first stopper 146 and the second stopper 164 avoid each other and do not contact each other.

[0029] It should be noted that the first stopper 146 is provided with a first slope surface 1464 and a second slope surface 1468, and the top surface 1642 of the second stopper 164 is set as a slope, which is not only convenient for installation, but also when the valve is opened, in the process of opening the valve from the fully closed position to about one circle, through the slope cooperation between the first stopper 146 and the second stopper 164, the first stopper 146 and the second stopper 164 are correspondingly avoided, so that there is enough clearance between the two parts to ensure non-interference, thereby preventing additional friction when the valve is opened. Figure 1 , Figure 2 and Figure 3 In the specific embodiment shown, the positioning plate body 142 is a circular disk with a mounting hole 144 at the center; the connecting plate 170 is annular, and the inner edge of the annular connecting plate 170 is fixedly connected to the outer edge of the top surface of the positioning plate body 142; the outer edge of the annular connecting plate 170 is fixedly connected to the inner side of the rotor 150.

[0030] exist Figure 1 , Figure 2 and Figure 3 In the specific embodiment shown, the mounting hole 144 is a columnar mounting hole that passes through the positioning plate body 142; the positioning plate 140 also includes a limiting ring 148, the limiting ring 148 protrudes from the top surface of the positioning plate body 142, and the limiting ring 148 is located on the outside of the hole wall of the columnar mounting hole 144; an annular groove 149 is formed between the limiting ring 148 and the hole wall of the columnar mounting hole 144; the annular area between the limiting ring 148 and the outer edge of the positioning plate body 142 constitutes a rotor mounting portion 145, which is used to be fixedly connected to the inner edge of the annular connecting plate 170.

[0031] Figure 1 The electric valve shown also includes a return spring 180 , which is sleeved on the periphery of the hole wall of the columnar mounting hole 144 and located in the annular groove 149 on the top surface of the positioning plate body 142 , wherein the lower end of the return spring 180 abuts against the annular groove 149 .

[0032] Figure 1The electric valve shown also includes a sleeve 190 and a coil assembly 200, wherein the sleeve 190 is directly or indirectly fixed to the valve seat assembly 110, and the sleeve 190 has a cavity (not marked) opening toward the valve seat assembly 110, and the valve seat assembly 110, the screw rod 120, the valve needle assembly 130, the positioning plate 140, the rotor 150, the nut assembly 160, the connecting plate 170 and the return spring 180 are located or partially located in the cavity; the coil assembly 200 is located outside the sleeve 190, and when power is turned on, the coil assembly 200 drives the rotor 150 to rotate.

[0033] In summary, in the electric valve provided by the present invention, the connecting plate 170, the rotor 150 and the positioning plate 140 are split. When the positioning plate 170 is installed, the valve needle assembly 130 is located at the fully closed position of the valve. During this process, the tooling can be used for positioning so that the first stop surface 1466 of the first stop portion 146 abuts against a side surface 1644 of the second stop portion 164 (which can be called the second stop surface). The position is matched. Figure 6 Then, the positioning plate 140 and the screw rod 120 are fixedly configured (such as welded) together (in this process, the tooling can be conveniently used for positioning and welding to achieve the fixation and matching of the first stopper 146 and the second stopper 164). After the positioning plate 140 and the screw rod 120 are welded, the tooling can be removed. Finally, the positioning plate 140 and the rotor 150 are fixedly connected by the connecting plate 170. This can greatly improve the assembly accuracy.

[0034] It should be noted that any changes made by those skilled in the art to the specific implementation of the present invention do not deviate from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not limited to the aforementioned specific implementation.

Claims

1. An electric valve, characterized in that: It includes: Screw rod; A valve seat assembly, which is provided with a valve port, a first channel and a second channel. When the valve port is opened, the first channel is connected with the second channel through the valve port, and when the valve port is closed, the first channel is disconnected from the second channel. A valve needle assembly connected to the lower part of the screw rod, wherein the screw rod can drive the valve needle assembly to move along the axis to open and close the valve port; A positioning plate, comprising a positioning plate body, a mounting hole penetrating the positioning plate body, and a first stopper protruding from the bottom surface of the positioning plate body, wherein the upper portion of the screw rod passes through and is fixedly mounted in the mounting hole of the positioning plate; A rotor is fixedly mounted on the outer side of the positioning plate, and the rotor drives the screw rod to rotate together through the positioning plate; A nut assembly is mounted on the valve seat assembly and is located below the positioning plate. A threaded hole is formed in the nut assembly. The screw rod passes through the threaded hole and is threadedly engaged with the threaded hole. A connecting plate is fixedly connected between the inner side of the rotor and the positioning plate, and the connecting plate is located on the top surface of the positioning plate body.

2. The electric valve according to claim 1, characterized in that: The connecting plate and the rotor are fixed by integral injection molding, and the connecting plate, the rotor and the positioning plate are separate. The positioning plate is first fixedly connected to the screw rod, and then the positioning plate and the rotor are fixedly connected through the connecting plate; When the screw rod rotates in the threaded hole along a first direction, the screw rod moves downward along the axis to drive the valve needle assembly to close the valve port; when the screw rod rotates in the threaded hole along a second direction opposite to the first direction, the screw rod moves upward along the axis to drive the valve needle assembly to open the valve port.

3. The electric valve according to claim 2, characterized in that: A protruding second stopper is formed on the top surface of the nut assembly. When the screw rod drives the valve needle assembly to close the valve port, the second stop portion contacts the first stop portion and blocks the first stop portion from further rotating along the first direction.

4. The electric valve according to claim 3, characterized in that: The first stop portion includes a convex surface, a first slope surface located on one side of the convex surface, and a first stop surface located between the convex surface and the first slope surface. The protruding surface is substantially parallel to the bottom surface of the positioning plate body; The first stop surface is substantially perpendicular to the bottom surface of the positioning plate body; The first slope surface is inclined from the first stop surface toward the bottom surface of the positioning plate body; The protruding surface is farther from the bottom surface of the positioning plate body than the first slope surface and the first stop surface.

5. The electric valve according to claim 4, characterized in that: When the screw rod drives the valve needle assembly to close the valve port, the first stop surface of the first stop portion abuts against a side surface of the second stop portion to prevent the first stop portion from further rotating in the first direction; During the process from when the first stop surface of the first stop portion abuts against a side surface of the second stop portion until the screw rod rotates one circle in the threaded hole along the second direction, the first stop portion and the second stop portion do not contact each other.

6. The electric valve according to claim 5, characterized in that: The first stopper also includes a second slope surface, The second slope surface is located on the other side of the convex surface; The second slope surface is inclined from the protruding surface toward the bottom surface of the positioning plate body; The protruding surface is farther from the bottom surface of the positioning plate body than the second slope surface.

7. The electric valve according to claim 6, characterized in that: The top surface of the second stopper is an inclined surface; The top surface of the second stop portion is inclined from a side surface of the second stop portion toward the top surface of the nut assembly.

8. The electric valve according to any one of claims 1 to 7, characterized in that: The positioning plate body is a disc with the mounting hole arranged at the center; The connecting plate is annular, and the inner edge of the annular connecting plate is fixedly connected to the outer edge of the positioning plate body; The outer edge of the annular connecting plate is fixedly connected to the inner side of the rotor.

9. The electric valve according to claim 8, characterized in that: The mounting hole is a columnar mounting hole that penetrates the positioning plate body; The positioning plate further comprises a limiting ring, the limiting ring is located on the top surface of the positioning plate body, and the limiting ring is located on the outer side of the hole wall of the columnar mounting hole; An annular groove is formed between the limiting circular ring and the hole wall of the columnar mounting hole; The annular area in the positioning plate body between the limiting ring and the outer edge of the positioning plate body constitutes a rotor mounting portion, and the rotor mounting portion is used to be fixedly connected to the inner edge of the annular connecting plate.

10. The electric valve according to claim 9, characterized in that: It also includes a return spring, The lower end of the return spring is located in the annular groove on the top surface of the positioning plate body; The lower end of the return spring abuts against the annular groove.

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