Electrically operated valve retainer and electrically operated valve

Abstract

The utility model provides an electric valve retainer and an electric valve, and relates to the field of valves. The electric valve retainer comprises a retainer body and a fixed body, the retainer body is provided with an assembly hole and is provided with two ring surfaces which are oppositely arranged on the axis of the assembly hole, and each ring surface is provided with a limiting protrusion in a protruding mode. The fixing body is fixedly connected with the retainer and used for being welded and fixed to the valve seat body. Due to the fact that the limiting protrusions are arranged on the two opposite ring faces of the retainer, when the retainer is assembled to the valve seat body, the front face and back face installation positions of the retainer do not need to be considered, the retainer is directly connected to the guide sleeve in a sleeved mode and matched with the valve seat body, and therefore the assembling difficulty is reduced, the assembling efficiency is improved, and the assembling cost is reduced. And the problem of limiting failure caused by assembly errors is solved.

Description

Technical Field

[0001] This utility model relates to the field of valves, and more specifically, to an electric valve stop and an electric valve. Background Technology

[0002] When an electric valve is running, the rotor assembly rotates under magnetic force, transmitting torque to the valve needle via a transmission mechanism. This causes the valve needle to rise and fall, regulating the valve's flow rate and its on / off state. The zero and reset positions of the electric valve rely on the quality of the parts' machining. Assembly requires specifying the thread start point and assembly direction, resulting in high precision and cost. Utility Model Content

[0003] The purpose of this utility model is to provide an electric valve stop and an electric valve, which can reduce assembly difficulty, improve assembly efficiency, reduce the requirements for part machining accuracy, and reduce costs.

[0004] The embodiments of this utility model are implemented as follows:

[0005] In a first aspect, this utility model provides an electric valve stop, comprising:

[0006] The valve includes a stop body and a fixing body. The stop body has an assembly hole and two annular surfaces arranged opposite each other on the axis of the assembly hole. Each annular surface has a limiting protrusion. The fixing body is fixedly connected to the stop body and is used to weld and fix it to the valve seat body.

[0007] In an optional embodiment, the fixing body and the stop body are configured as an integral structure.

[0008] In an optional embodiment, the outer contour of the cross-section of the stop is set to be non-circular, and the fixing body and the stop are fixed relative to each other in the circumferential direction of the assembly hole; wherein, the cross-section is a plane perpendicular to the axis of the assembly hole.

[0009] In an optional embodiment, a fixing groove is provided on the outer peripheral surface of the stop body, and the fixing body is engaged in the fixing groove.

[0010] In an optional embodiment, the height of at least a portion of the limiting protrusion gradually decreases in the direction from the first side to the second side of the limiting protrusion; the height direction of at least a portion of the limiting protrusion is the same as the axial extension direction of the mounting hole; the first side and the second side are arranged at intervals in the circumferential direction of the mounting hole.

[0011] Secondly, this utility model provides an electric valve, which includes a valve core unit and a valve needle unit, wherein the valve core unit includes:

[0012] The valve core body, guide sleeve, valve seat body, and the electric valve stop member described in any of the foregoing embodiments; the valve core body is provided with a first hole and a second hole, and the valve core body and the guide sleeve are both installed on the valve seat body; the stop member is movably connected to the valve seat body, and the stop member can be fixedly connected to the valve seat body through the fixing body after its position is adjusted.

[0013] The valve needle unit is threadedly connected to the guide sleeve. When the valve seat body assembly rotates relative to the guide sleeve, it reciprocates up and down relative to the valve seat body to switch between a first position connecting the first hole and the second hole and a second position blocking the first hole and the second hole. The stop body is used to abut against the valve needle unit to adjust the initial position of the valve needle unit.

[0014] In an optional embodiment, the valve seat body is provided with a positioning groove, and the fixing body is disposed in the positioning groove.

[0015] In an optional embodiment, the fixing body is used to weld and fix to the valve seat body after the relative position of the limiting protrusion and the valve needle unit is determined.

[0016] In an optional embodiment, the valve core unit further includes a valve body, the valve body being provided with a buffer chamber, a first connection port and a second connection port, the valve core body being installed in the buffer chamber, the first connection port being connected to the buffer chamber through a first hole, and the second hole being connected to the second connection port.

[0017] In an optional embodiment, the valve seat body is provided with a pressure balancing hole, and the fixing body is provided with a connecting hole, wherein the pressure balancing hole connects the buffer chamber and the connecting hole.

[0018] The beneficial effects of this utility model embodiment are:

[0019] In summary, the electric valve stop provided in this embodiment includes a stop body and a fixing body. Limiting protrusions are provided on both opposite annular surfaces of the stop body. When assembling the stop body onto the valve seat body, there is no need to consider the front and back installation positions of the stop body; the stop body can be directly sleeved onto the guide sleeve and mates with the valve seat body. This reduces assembly difficulty, improves assembly efficiency, and mitigates the problem of limit failure due to assembly errors. Furthermore, before determining the relative position of the stop body and the valve needle unit, the stop body can move relative to the valve seat body. That is, the position of the stop body can be adjusted according to the position of the valve needle unit, reducing the processing and assembly difficulty of the valve needle unit. After the relative position of the valve needle unit and the stop body is determined, the fixing body is used to fix the stop body to the valve seat body, thus fixing the relative position of the valve needle unit and the stop body. The stop body effectively positions the valve needle unit, ensuring that the initial position of the valve needle unit is consistent after multiple positioning operations, which is beneficial for the control of the electric valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the electric valve stop component according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the stop body according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the electric valve according to an embodiment of the present utility model;

[0024] Figure 4 This is a cross-sectional view of the electric valve according to an embodiment of the present utility model;

[0025] Figure 5 This is a partial structural schematic diagram of the electric valve according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the valve seat according to an embodiment of the present utility model.

[0027] icon:

[0028] 100-Valve core unit; 110-Valve core body; 111-First hole; 112-Second hole; 120-Guide sleeve; 130-Electric valve stop; 131-Stop body; 1311-Assembly hole; 1312-Limiting protrusion; 1313-Fixing groove; 132-Fixing body; 1321-Communication hole; 140-Valve seat body; 141-Pressure balance hole; 142-Positioning groove; 143-Communication groove; 144 - Insertion slot; 145 - Through hole; 150 - Valve body; 151 - Buffer chamber; 152 - First connection port; 153 - Second connection port; 160 - First seal; 170 - Second seal; 200 - Valve needle unit; 210 - Magnetic rotor assembly; 220 - Guide nut; 221 - Limiting protrusion; 230 - Valve needle; 240 - Positioning sleeve; 250 - First elastic element; 260 - Second elastic element; 270 - Housing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] In some existing technical solutions, in order to adjust the position of the valve needle unit 200 and the stop structure and reduce the assembly difficulty, the stop structure is separated from the valve seat body 140. However, only a limit part is provided at the top of the braking structure. The limit part at the top cooperates with the valve needle unit 200 to achieve the limit. Therefore, when assembling the stop structure, the stop structure needs to be installed on the valve seat body 140 with the top facing upward. The assembly operation is inconvenient and there is a risk of misassembly leading to the failure of the limit, which requires rework and increases the assembly cost.

[0032] In view of this, the designers have provided an electric valve stop 130 to reduce assembly difficulty and improve assembly efficiency.

[0033] Please combine Figures 1-2In this embodiment, the electric valve stop 130 includes a stop body 131 and a fixing body 132. The stop body 131 is provided with an assembly hole 1311 and has two annular surfaces arranged opposite to each other on the axis of the assembly hole 1311. Each annular surface is provided with a limiting protrusion 1312. The fixing body 132 is fixedly connected to the stop body 131 and is used to weld and fix it to the valve seat body 140.

[0034] As described above, the assembly method of the electric valve stop 130 provided in this embodiment is as follows:

[0035] The electric valve stop 130 includes a stop body 131 and a fixing body 132. Limiting protrusions 1312 are provided on the two opposite annular surfaces of the stop body 131. When assembling the stop body 131 onto the valve seat body 140, it is not necessary to consider the front and back installation positions of the stop body 131. The stop body 131 can be directly sleeved onto the guide sleeve 120 and cooperate with the valve seat body 140. This ensures that the top of the stop body 131 always has a limiting protrusion 1312 that cooperates with the valve needle unit 200. This reduces the assembly difficulty, improves the assembly efficiency, and improves the problem of limiting failure due to assembly errors. Meanwhile, before determining the relative position of the stop body 131 and the valve needle unit 200, the stop body 131 can move relative to the valve seat body 140. That is, the position of the stop body 131 can be adjusted according to the position of the valve needle unit 200, reducing the processing and assembly difficulty of the valve needle unit 200. After the relative position of the valve needle unit 200 and the stop body 131 is determined, the stop body 131 is fixed to the valve seat body 140 by the fixing body 132, thereby fixing the relative position of the valve needle unit 200 and the stop body 131. The stop body 131 effectively positions the valve needle unit 200, ensuring that the initial position of the valve needle unit 200 is consistent after multiple positioning, which is beneficial to the control of the electric valve.

[0036] The following embodiments illustrate the details of the electric valve stop 130 provided in this application by way of example.

[0037] In this embodiment, optionally, the stop body 131 is configured as an annular component, and the stop body 131 can be sleeved onto the guide sleeve 120 via the mounting hole 1311 in its middle. A limiting protrusion 1312 is provided on each of the two annular surfaces of the stop body 131, and the limiting protrusion 1312 protrudes from the corresponding annular surface along the axial direction of the mounting hole 1311. The relative positions of the limiting protrusions 1312 on the two annular surfaces are not specifically limited.

[0038] Furthermore, the height of at least a portion of each limiting protrusion 1312 gradually decreases in the direction from the first side to the second side of the limiting protrusion 1312; the height direction of at least a portion of the limiting protrusion 1312 is the same as the axial extension direction of the mounting hole 1311; the first side and the second side are spaced apart in the circumferential direction of the mounting hole 1311. Thus, the limiting protrusion 1312 has high structural strength and a long service life, and the side with the higher height of the limiting protrusion 1312 is used to cooperate with the valve needle unit 200, resulting in a good limiting effect.

[0039] Furthermore, an annular fixing groove 1313 is provided on the outer peripheral surface of the stop body 131, and the fixing body 132 is engaged in the fixing groove 1313. The fixing body 132 has an annular structure, and the fixing body 132 and the stop body 131 can be made into an integral structure by injection molding or other methods.

[0040] Optionally, the outer contour of the cross-section of the stop 131 is non-circular, and the fixed body 132 and the stop 131 are fixed relative to each other in the circumferential direction of the mounting hole 1311; wherein, the cross-section is a plane perpendicular to the axis of the mounting hole 1311. For example, part of the outer circumferential surface of the stop 131 is an arc surface, and the other part is a plane. Correspondingly, after the fixed body 132 and the stop 131 are connected, they will not rotate relative to each other.

[0041] Furthermore, the fixing body 132 is provided with a connecting hole 1321, which can be a round hole. The number of connecting holes 1321 can be set as needed, and multiple connecting holes 1321 are distributed around the fixing body 132.

[0042] The electric valve stop 130 provided in this embodiment has limit protrusions 1312 at both the top and bottom of the stop body 131. Therefore, during assembly, there is no need to consider the front and back of the stop body 131, which reduces the assembly difficulty and prevents the electric valve from failing to operate normally due to assembly errors.

[0043] Please combine Figures 1-6This embodiment also provides an electric valve, which includes a valve core unit 100 and a valve needle unit 200. The valve core unit 100 includes a valve core body 110, a guide sleeve 120, an electric valve stop 130, and a valve seat body 140. The valve core body 110 has a first hole 111 and a second hole 112. Both the valve core body 110 and the guide sleeve 120 are mounted on the valve seat body 140. The stop 131 is movably connected to the valve seat body 140, and the stop 131 can be fixed relative to the valve seat body 140 after its position is adjusted. The valve needle unit 200 is threadedly connected to the guide sleeve 120. The valve seat body 140 assembly can rotate relative to the guide sleeve 120 while reciprocating up and down relative to the valve seat body 140, so as to switch between a first position that connects the first hole 111 and the second hole 112 and a second position that blocks the first hole 111 and the second hole 112. The limiting protrusion 1312 on the stop body 131 is used to abut against the valve needle unit 200 to adjust the initial position of the valve needle unit 200, and to restrict the valve needle unit 200 from rotating relative to the valve seat body 140 when abutting.

[0044] It should be noted that when assembling the valve needle unit 200 and the valve core unit 100, after the valve needle unit 200 is assembled to the appropriate position, the position of the stop body 131 relative to the guide sleeve 120 and the valve seat body 140 is adjusted by rotating the stop body 131, thereby adjusting the relative position of the stop body 131 and the valve needle unit 200. The stop body 131 serves to position the valve needle unit 200 at its initial position. It is not necessary to check the height of the thread start point, the angle of the thread start point, and the relative position of the stop point protrusion before assembling the valve needle unit 200, which reduces the assembly difficulty, reduces the machining accuracy of the parts, and thus reduces the processing and manufacturing cost. After the position of the stop body 131 is adjusted, it is fixedly connected to the valve seat body 140 through the fixing body 132, thereby fixing the stop body 131. The stop body 131 will not rotate relative to the guide sleeve 120 and the valve seat body 140. At this time, the stop body 131 serves as a reference component, which facilitates the repeated positioning of the valve needle unit 200 in the future and ensures that the initial position of the valve needle unit 200 is consistent after each positioning, which is beneficial to the control of the electric valve.

[0045] Please combine Figures 3-6In this embodiment, optionally, the valve core unit 100 further includes a valve body 150, a first sealing element 160, and a second sealing element 170. The valve core body 110 has a cylindrical structure, and at least one first hole 111 is provided on the peripheral wall of the valve core body 110. The valve core body 110 also has a second hole 112 extending along its axis, and at least one first hole 111 communicates with the second hole 112. The guide sleeve 120 is provided with external threads, and the guide sleeve 120 is inserted into the valve seat body 140 and is interference-fitted with the valve seat body 140. The valve seat body 140 is provided with a pressure balance hole 141 and a positioning groove 142. The positioning groove 142 is a circular groove, and a connecting groove 143 is provided on the bottom wall of the positioning groove 142. A plug-in groove 144 is provided on the bottom wall of the connecting groove 143. The positioning groove 142, the connecting groove 143, and the plug-in groove 144 are all circular grooves. A through hole 145 is provided on the bottom wall of the plug-in groove 144. The positioning groove 142, the connecting groove 143, the plug-in groove 144, and the through hole 145 are coaxially arranged. The guide sleeve 120 is plugged and fixed in the plug-in groove 144. The stop body 131 is located in the connecting groove 143, and the fixing body 132 is located in the positioning groove 142. The port of the pressure balance hole 141 is located on the bottom wall of the connecting groove 143. The pressure balance hole 141 is the same as the connecting hole 1321 on the fixing body 132 through a connecting groove.

[0046] It should be noted that the number of pressure balancing holes can be one or more. The end of the pressure balancing hole away from the connecting groove is connected to the buffer chamber 151. In this way, the pressure balancing hole enables the valve needle unit 200 and the valve core unit 100 to be internally connected, achieving pressure balance and facilitating disassembly.

[0047] Meanwhile, the valve body 150 is provided with a buffer chamber 151, a first connection port 152, and a second connection port 153. The valve core body 110 is installed in the buffer chamber 151. The first connection port 152 is connected to the buffer chamber 151 through a first hole 111, and the second hole 112 is connected to the second connection port 153. A first sealing element 160 is provided between the valve core body 110 and the buffer chamber 151 to prevent fluid entering from the first hole 111 from directly entering the second hole 112 through the gap between the valve core body 110 and the valve seat body 140. A second sealing element 170 is provided between the valve seat body 140 and the valve body 150 to prevent internal fluid leakage.

[0048] When assembling the valve core unit 100, the valve core body 110 is first embedded into the buffer chamber 151. Then, the valve seat body 140 is connected to the valve body 150, and the valve seat body 140 is sleeved on the outside of the valve core body 110, resulting in a compact structure. Next, the guide sleeve 120 is inserted into the insertion groove 144, so that the guide sleeve 120 and the valve seat body 140 are interference-fitted to achieve a fixed connection. Finally, the stop body 131 is adjusted outside the guide sleeve 120. The stop body 131 is located in the positioning groove 142. At this time, the fixing body 132 on the stop body 131 is not welded to the valve seat body 140. The stop body 131 can rotate around the guide sleeve 120 in the positioning groove 142, thereby adjusting the position of the limiting protrusion 1312 in the circumferential direction of the guide sleeve 120, thus limiting the position of the valve needle unit 200 when assembling the valve needle unit 200. Furthermore, after the relative position of the stop body 131 with the limiting protrusion 1312 and the valve needle unit 200 is determined, it is welded to the valve seat body 140. Specifically, when the stop body 131 abuts against the limiting protrusion 221 on the valve needle unit 200 with the limiting protrusion 1312, it is rotated clockwise by a certain angle, which is determined according to the number of valve opening pulses, and then welded and fixed to the valve seat body 140.

[0049] In this embodiment, optionally, the valve needle unit 200 includes a magnetic rotor assembly 210, a guide nut 220, a valve needle 230, a positioning sleeve 240, a first elastic element 250, a second elastic element 260, and a housing 270. The magnetic rotor assembly 210 is fixedly connected to the guide nut 220, and the bottom of the guide nut 220 is provided with a limiting protrusion 221 for abutting against the stop body 131. The valve needle 230 passes through the guide nut 220, the first elastic element 250 is sleeved on the valve needle 230 and abuts against the guide nut 220, and the positioning sleeve 240 is connected to the valve needle 230. The first elastic element 250 is used to make the valve needle 230 have the tendency to block the movement of the first hole 111 and the second hole 112. The positioning sleeve 240 can abut against the guide nut 220 to limit the range of movement of the valve needle 230 under the elastic force of the first elastic element 250. That is, the guide nut 220 is provided for the valve needle. A stepped through-hole 145 is provided, and a valve needle 230 passes through the stepped through-hole 145. One end of the valve needle 230 extends out of the guide nut 220 away from the valve core unit 100. A positioning sleeve 240 is sleeved on the valve needle 230 and fixedly connected to it. A first elastic member 250 is located in the stepped hole, with one end abutting against the hole wall and the other end abutting against the valve needle 230. The first elastic member 250 is in a compressed state, which can push the valve needle 230 towards the valve core unit 100. A second elastic member 260 abuts against both the outer shell 270 and the end of the guide nut 220 away from the valve core unit 100, and the second elastic member 260 is in a compressed state. The outer shell 270 is fixedly connected to the valve seat body 140, and the outer shell 270 and the valve seat body 140 are in a sealed fit.

[0050] It should be noted that both the first elastic element 250 and the second elastic element 260 can be configured as springs.

[0051] When the valve needle unit 200 is assembled with the valve core unit 100, the valve needle 230 passes through the guide sleeve 120, blocking the second hole 112. The guide sleeve 120 is then inserted into the guide nut 220, with its external thread screwed into the threaded hole of the guide nut 220. In other words, the valve needle unit 200 is screwed into the valve core unit 100. When the valve needle unit 200 is screwed into the appropriate position, the position of the stop body 131 is adjusted so that the limiting protrusion 1312 on the stop body 131 abuts against the limiting protrusion 221 on the guide nut 220. The limiting protrusion 1312 restricts the rotation of the guide nut 220, thus determining the initial position of the valve needle unit 200. Then, rotate the valve needle unit 200, moving it upwards by approximately 3mm. This increases the distance between the magnetic rotor assembly 210 and the fixed body 132. When welding the fixed body 132 onto the valve seat body 140, this avoids adverse effects on the magnetic rotor assembly 210. After the stop body 131 is welded, its position remains unchanged, serving as a reference position for easy reset and zeroing of the valve needle unit 200, making operation convenient.

[0052] It should be noted that the working process of the electric valve provided in this embodiment is as follows:

[0053] When the electric valve is energized and resets, the valve needle 230 is in the closed position of the second hole 112, blocking the first hole 111 and the second hole 112. The magnetic rotor assembly 210 rotates after being energized, causing the guide nut 220, valve needle 230, and positioning sleeve 240 to rotate relative to the guide sleeve 120. Since the guide nut 220 is screwed to the guide sleeve 120, it can also move along the axis of the guide sleeve 120. This means the guide nut 220 causes the valve needle 230 to rise, at which point the valve needle 230 leaves the second hole 112, opening it. After rising to a certain height, the magnetic rotor assembly 210 rotates in the opposite direction, closing the second hole 112. This cycle repeats continuously.

[0054] The electric valve provided in this embodiment reduces assembly difficulty and improves assembly efficiency by providing limiting protrusions 1312 on both sides of the stop body 131, making it less prone to errors during assembly.

[0055] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stop element for an electric valve, characterized in that, include: The stop body (131) and the fixing body (132) are provided. The stop body (131) is provided with an assembly hole (1311). The stop body (131) has two annular surfaces arranged opposite to each other on the axis of the assembly hole (1311). Each annular surface is provided with a limiting protrusion (1312). The fixing body (132) is fixedly connected to the stop body (131) and is used to weld and fix to the valve seat body (140).

2. The electric valve stop according to claim 1, characterized in that: The fixing body (132) and the stop body (131) are configured as an integral structure.

3. The electric valve stop according to claim 2, characterized in that: The outer contour of the cross-section of the stop (131) is set to be non-circular, and the fixing body (132) and the stop (131) are fixed relative to each other in the circumferential direction of the assembly hole (1311); wherein, the cross-section is a plane perpendicular to the axis of the assembly hole (1311).

4. The electric valve stop according to claim 1, characterized in that: The stop body (131) has a fixing groove (1313) on its outer peripheral surface, and the fixing body (132) is engaged in the fixing groove (1313).

5. The electric valve stop according to claim 1, characterized in that: The height of at least a portion of the limiting protrusion (1312) gradually decreases in the direction from the first side to the second side of the limiting protrusion (1312); the height direction of at least a portion of the limiting protrusion (1312) is the same as the axial extension direction of the mounting hole (1311); the first side and the second side are arranged at intervals in the circumferential direction of the mounting hole (1311).

6. An electric valve, characterized in that, The electric valve includes a valve core unit (100) and a valve needle unit (200), wherein the valve core unit (100) includes: The valve core body (110), guide sleeve (120), valve seat body (140), and electric valve stop (130) according to any one of claims 1-5; the valve core body (110) is provided with a first hole (111) and a second hole (112), and the valve core body (110) and guide sleeve (120) are both mounted on the valve seat body (140); the stop (131) is movably connected to the valve seat body (140), and the stop (131) can be fixedly connected to the valve seat body (140) by the fixing body (132) after its position is adjusted; The valve needle unit (200) is threadedly connected to the guide sleeve (120). When the valve seat body (140) assembly rotates relative to the guide sleeve (120), it reciprocates relative to the valve seat body (140) to switch between a first position connecting the first hole (111) and the second hole (112) and a second position blocking the first hole (111) and the second hole (112). The stop (131) is used to abut against the valve needle unit (200) to adjust the initial position of the valve needle unit (200).

7. The electric valve according to claim 6, characterized in that: The valve seat body (140) is provided with a positioning groove (142), and the fixing body (132) is located in the positioning groove (142).

8. The electric valve according to claim 6, characterized in that: The fixing body (132) is used to weld and fix to the valve seat body (140) after the relative position of the limiting protrusion (1312) and the valve needle unit (200) is determined.

9. The electric valve according to claim 6, characterized in that: The valve core unit (100) further includes a valve body (150), which is provided with a buffer chamber (151), a first connection port (152) and a second connection port (153). The valve core body (110) is installed in the buffer chamber (151). The first connection port (152) is connected to the buffer chamber (151) through the first hole (111), and the second hole (112) is connected to the second connection port (153).

10. The electric valve according to claim 9, characterized in that: The valve seat body (140) is provided with a pressure balance hole, and the fixing body (132) is provided with a connecting hole (1321). The pressure balance hole connects the buffer chamber (151) and the connecting hole (1321).

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