Motorised valve

Abstract

An electric valve comprises a driving part, a transmission part and a valve core; the transmission part is located in an upper cavity; the driving part drives the transmission part to move, and the transmission part drives the valve core to move; the electric valve further comprises a valve seat, the valve seat has a valve port, a first port and a second port, the valve port is located between the first port and the second port; the valve core penetrates the valve seat; the valve core comprises a side wall part and a top part, the valve core has a valve core cavity, the side wall part and the top part surround the valve core cavity, the top part has a communication hole, the communication hole communicates the upper cavity and the valve core cavity, and the pressure of the two cavities is balanced; the cross-sectional area of the side wall part of the valve core is different from the flow area of the valve port; the valve core is only subjected to the force in one direction applied by the transmission part, so that the electric valve is simple in structure and is conducive to reducing the manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a flow control valve, in particular to an electric valve. BACKGROUND

[0002] The electric valve is applied to a heat pipe system, which can cut off refrigerant or adjust flow size; how to simplify the structure of the electric valve and reduce product manufacturing cost. SUMMARY

[0003] The purpose of the present application is to provide an electric valve to simplify the product structure and reduce the product manufacturing cost.

[0004] An electric valve, comprising a driving part, a transmission part, a valve core and a valve seat; the electric valve further has an upper cavity and a lower cavity, the transmission part is located in the upper cavity, and the lower cavity is shaped in the valve seat; the driving part drives the transmission part to move, the transmission part drives the valve core to move, and the valve core can move up and down along the axial direction; the electric valve has a valve port, a first port and a second port, the valve port is located between the first port and the second port, the first port is communicated with the lower cavity, and the second port is communicated with the lower cavity through the valve port; the valve core comprises a side wall part and a transmission contact part, the transmission contact part can be subjected to the downward thrust force of the transmission part, and the valve core is not subjected to the upward pulling force of the transmission part.

[0005] The technical scheme of the electric valve of the present application improves the connection mode of the transmission part and the valve core, so that the transmission part only applies a thrust force to the valve core, and the structure of the electric valve is simplified; the difference between the cross-sectional area of the side wall part of the valve core and the flow area of the valve port is set, so that the valve core is subjected to a resultant force opposite to the force applied by the transmission part to the valve core, one port entering the working medium can make the valve port open, another port entering the working medium, and the electric valve is in a full closed state; when the electric valve is connected to the system, the valve can be prevented from opening under reverse pressure, and the product manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 is a sectional structure schematic diagram of an embodiment of the electric valve of the present application;

[0007] Figure 2 is Figure 1 is a structural schematic diagram of the electric valve in which the stator part and the first connecting pipe and the second connecting pipe are removed;

[0008] Figure 3 is Figure 1 is a force analysis diagram of the valve core when the electric valve in the first port is the inlet port;

[0009] Figure 4 is Figure 1Force analysis diagram of the valve core of the electric valve when the second port is the inlet end;

[0010] Figure 5 is a sectional structural schematic diagram of a second embodiment of the electric valve of the present application;

[0011] Figure 6 is Figure 5 Structural schematic diagram of the electric valve with the stator component and the first connecting pipe and the second connecting pipe removed;

[0012] Figure 7 is Figure 5 Force analysis diagram of the valve core of the electric valve when the second port is the inlet end;

[0013] Figure 8 is Figure 5 Force analysis diagram of the valve core of the electric valve when the first port is the inlet end;

[0014] Figure 9 is a sectional structural schematic diagram of a third embodiment of the electric valve of the present application;

[0015] Figure 10 is Figure 9 Structural schematic diagram of the electric valve with the stator component and the first connecting pipe and the second connecting pipe removed;

[0016] Figure 11 is Figure 9 Force analysis diagram of the valve core of the electric valve when the first port is the inlet end;

[0017] Figure 12 is Figure 9 Force analysis diagram of the valve core of the electric valve when the second port is the inlet end;

[0018] Figure 13 is a sectional structural schematic diagram of a fourth embodiment of the electric valve of the present application;

[0019] Figure 14 is Figure 13 Structural schematic diagram of the electric valve with the stator component and the first connecting pipe and the second connecting pipe removed;

[0020] Figure 15 is Figure 13 Force analysis diagram of the valve core of the electric valve when the first port is the inlet end;

[0021] Figure 16 is Figure 13 Force analysis diagram of the valve core of the electric valve when the second port is the inlet end

[0022] Figure 17 is a sectional structural schematic diagram of a combination structure of the connecting seat and the valve seat. DETAILED DESCRIPTION

[0023] The application will be further described below in connection with the drawings and specific embodiments:

[0024] In a refrigeration system, a valve device is needed to be installed on the refrigerant circuit for cutting off or regulating the refrigerant flow, in order to improve the control accuracy of the flow, an electrically driven valve device, hereinafter referred to as an electric valve, is adopted.

[0025] Referring to Figures 1 to 17 , the electric valve 10 comprises a driving part, a transmission part 3, a valve core 4 and a valve seat 5; in this embodiment, the driving part comprises a stator part 1 and a rotor part 2, and of course other driving structures such as magnetic driving can also be adopted. The electric valve 10 has an upper cavity 101 and a lower cavity 102, the transmission part 3 is located in the upper cavity 101, the valve seat 5 forms the lower cavity 102, and the stator part 1 is located outside the periphery of the rotor part 2; the electric valve has a valve port 51, a first port 52 and a second port 53, the valve port 51 is located between the first port 52 and the second port 53, the first port 52 is in communication with the lower cavity 102, and the second port 53 is in communication with the lower cavity 102 through the valve port 51; in this embodiment, the valve port 51, the first port 52 and the second port 53 are formed in the valve seat 5, and of course the valve port 51, the first port 52 and the second port 53 can also be formed separately with the valve seat and then connected or communicated with the valve seat; the electric valve further comprises a first connecting pipe 91 and a second connecting pipe 92, the first connecting pipe 91 is in communication with the first port 52, and the second connecting pipe 92 is in communication with the second port 53; the stator part 1 is connected to the wiring terminal 93, and an excitation magnetic field is generated after being energized according to a certain rule, the rotor part 2 rotates in the excitation magnetic field, the transmission part 3 converts the rotation of the rotor part into the axial movement of the valve core, the valve core moves relative to the valve port, so that the valve core closes or opens the valve port, thereby being able to cut off the refrigerant or regulate the flow size.

[0026] In order to simplify the structure of the electric valve, the valve core is only subjected to the force in one direction upward or downward applied by the transmission part, and the other direction is not subjected to the force constraint of the transmission part, so that the connection structure of the valve core and the transmission part is simplified, which is conducive to reducing the cost.

[0027] In one of the following embodiments, the end of the transmission component 3 abuts against the outside of the valve core 4, the end of the transmission component 3 exerts a downward pushing force on the valve core 4, the transmission component 3 can move downward, the transmission component 3 can push the valve core 4 to move downward, if no working medium is introduced, the transmission component 3 moves upward, the valve core 4 cannot move upward with the transmission component 3, in order to ensure that the valve core 4 moves upward, after the working medium is introduced, it is ensured that the resultant force acting on the valve core 4 after the working medium acts upward; in another embodiment, the end of the transmission component 3 abuts against the inside of the valve core 4, the end of the transmission component 3 exerts an upward pulling force on the valve core 4, the transmission component 3 moves upward, the transmission component 3 drives the valve core 4 to move upward, if no working medium is introduced, the transmission component 3 moves downward, the valve core 4 cannot move downward under the action of gravity and friction, in order to ensure that the valve core 4 moves downward, after the working medium is introduced, it is ensured that the resultant force acting on the valve core 4 after the working medium acts downward.

[0028] The valve core 4 comprises a side wall part 41 and a top part 42, both of which surround to form a valve core cavity 43; the valve core has a communication hole 421, in this embodiment, the communication hole 421 is located in the top part 42, of course, the communication hole can also be located in the side wall part, the communication hole 421 communicates the upper cavity body 101 and the valve core cavity 43, so that the pressures of the upper cavity body 101 and the valve core cavity 34 are balanced, that is, the pressures of the upper cavity body and the valve core cavity are the same, the first pressure P1; the valve core 4 further comprises an abutting part 43, the abutting part 43 is matched with the valve port 51 and can close the valve port 51, the abutting part 43 is a bevel or arc surface structure; the outer diameter of the abutting part gradually increases from the free end of the abutting part to the outside of the side wall part, at least part of the abutting part is located in the lower cavity. In this embodiment, the transmission contact part is the top part, of course, the valve core can also be turned over, at this time, the transmission contact part is the bottom part of the valve core.

[0029] In this embodiment, the electric valve further comprises a connecting seat 50, in this embodiment, the connecting seat 50 is integrally formed with the valve seat 5 by furnace welding, of course, the connecting seat 50 and the valve seat 5 can be made into one whole. The diameters represented below refer to the corresponding structures being circular, when the corresponding structures are non-circular, the corresponding is the equivalent diameter.

[0030] Figures 1 to 4 A schematic diagram of one embodiment of the electric valve, in this embodiment, the electric valve 10 comprises a stator component 1, a rotor component 2, a transmission component 3 and a valve core 4, the stator component 1 drives the rotor component 2 to rotate, the rotor component 2 drives the transmission component 3 to move axially, the transmission component 3 moves downward to push the valve core 4 to close the valve port 51 downward, when the transmission component 3 moves upward, the valve core 4 is acted on by the upward resultant force of the working medium and moves upward with the transmission component 3 synchronously, gradually opening the valve port, adjusting the flow through the valve port.

[0031] In this embodiment, the stator component 1 is located on the outer periphery of the rotor component 2 and is isolated by the cover 6. The cover 6 forms an upper cavity 101, and the rotor component 2 is located in the upper cavity 101. After being energized, an excitation magnetic field is formed around the stator component 1 to drive the rotor component 2 to rotate. The transmission component 3 includes a screw 31 and a nut 32. The screw 31 is fixedly connected to the rotor component 2. The outer wall of the screw 31 is provided with an external thread, which is threaded with the nut 32 to convert the rotation of the rotor component 2 into axial up and down movement. The bottom end of the screw 31 can abut against the outer surface of the top 41 of the valve core 4. When the screw 31 moves downward along the axial direction, it pushes the valve core 4 to move downward to close the valve or reduce the opening of the valve.

[0032] Combination Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In this embodiment, the cross-section of the sidewall portion of the valve core 4 is annular, the diameter of the outer edge of the sidewall portion 41 is a first diameter D1, and the diameter of the valve port 51 is a second diameter D2. The first diameter D1 is larger than the second diameter D2. The valve core 4 and the valve port 51 fit tightly together. Figure 2 and Figure 3 With the valve core 4 and valve port 51 tightly fitted, the medium enters from the first port 52. The lower cavity filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2. The first diameter D1 is larger than the second diameter D2. The surface formed by this part is subjected to the first upward axial pressure F1 of the working medium. The valve core is also subjected to its own gravity. In addition to the action of the screw on the valve core, the resultant force of the forces acting on the valve core is F1-G. When this resultant force is upward, the electric valve operates. When the rotor component 2 drives the transmission component 3 to move upward axially, the valve core 4 is subjected to the resultant force along the axial direction and upward, and gradually opens the valve port as the transmission component 3 moves along the axial direction and upward. Among them, the first pressure... To ensure that F1-G points upwards and the valve can open, the first diameter D1 must be larger than the second diameter D2. The area enclosed by the outer edge of the top is... The flow area of ​​the valve port is

[0033] See also Figure 2 and Figure 4 In this embodiment, with the valve core 4 tightly fitted to the valve port 51, the medium enters from the second port 53. The valve core 4 is tightly fitted to the valve seat 51, and the valve core cavity 43 is connected to the upper cavity through the connecting hole 421. The pressure in the two cavities is the first pressure P1. In addition to the valve core being acted upon by the screw, the resultant force F acting on the valve core is... 合 =F2-F3-G, where When the first diameter D1 is greater than the second diameter D2, the resultant force F of the forces acting on the spool is downward, the spool 4 is always acted on by an axial downward resultant force, the spool 4 is tightly fitted with the valve seat 2, the valve port cannot be opened, and the valve can be prevented from being opened when the system is under reverse pressure. When the working medium enters through the second port 53, in order for the spool to open the valve port, the resultant force F of the forces acting on the spool should be upward, and at least the second diameter D2 should be greater than the first diameter D1.

[0034] Figures 5 to 8 The schematic diagram of another embodiment of the electric valve, the main difference compared with the above embodiment is that the side wall part 41 comprises a large diameter part 411 and a small diameter part 412, the diameter of the small diameter part is the first diameter D1, the diameter of the large diameter part is the third diameter D3, the first diameter D1 is smaller than the third diameter D3, the side wall part forms an annular step surface 44 between the large diameter part 411 and the small diameter part 412, the step surface 44 can abut against the bottom 514 of the connecting seat 50, and can limit the spool 3 from continuing to move upward; the first diameter D1 is smaller than the second diameter D2.

[0035] For reference, Figure 6 and Figure 7 In this embodiment, the working medium enters from the first port 52, the spool 4 is tightly fitted with the valve port 51, the lower cavity part filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the third diameter D3 is greater than the second diameter D2, the surface formed by this part is acted on by the axial upward first pressure F1 of the working medium, the third diameter D3 is greater than the first diameter D1, and the step surface is acted on by the downward fourth pressure F4, the spool is also acted on by its own gravity, in addition to the action of the screw rod, the resultant force F of the forces acting on the spool is 合 F1-F4-G, wherein Since the first diameter D1 is smaller than the second diameter D2, the resultant force F of the forces acting on the spool is 合 an axial downward resultant force, so the spool 4 always remains tightly fitted with the valve seat 5, and the valve can be prevented from being opened when the system is under reverse pressure.

[0036] For reference, Figure 6 and Figure 8 In this embodiment, the working medium enters from the second port 53, the spool 4 is tightly fitted with the valve port 51, the spool cavity is communicated with the upper cavity through the communication hole 421, and the pressure in the two cavities is the first pressure P1; since the first diameter D1 is greater than the fourth diameter D4, the spool 4 is acted on by an axial downward third force F3, since the second diameter D2 is greater than the fourth diameter D4, the spool 4 is acted on by an axial upward second force F2, in addition to the action of the screw rod, the resultant force F of the forces acting on the spool is 合F2-F3-G, Since the second diameter D2 is larger than the first diameter D1, the valve core 4 is subjected to the resultant force axially upward, and when the rotor component 2 drives the transmission component 3 to move axially upward, the valve core 4 is subjected to the resultant force axially upward, which gradually opens the valve port as the transmission component 3 moves axially upward, thereby achieving flow regulation.

[0037] In the above two embodiments, one port entering the working medium can open the valve port, and the other port entering the working medium can make the electric valve in a fully closed state. When the electric valve is connected to a system, it can prevent the valve from opening under reverse pressure.

[0038] Figures 9 to 12 The third embodiment of the electric valve is shown in the figure. The main difference between the second embodiment and the third embodiment is that the top portion 42 of the valve core 4 has a through hole that can accommodate the screw rod 31. In this embodiment, the through hole and the communication hole can be the same hole, i.e., the through hole can be the communication hole. The lower end of the screw rod 31 has a flange portion 311. The screw rod 31 passes through the through hole from the inside of the valve core 4, and the flange portion abuts the inner side of the top portion 42. When the transmission component 3 moves axially upward, it pulls the valve core 5 away from the valve port. The side wall portion 41 includes a large diameter portion 411 and a small diameter portion 412. The diameter of the small diameter portion is the first diameter D1, and the diameter of the large diameter portion is the third diameter D3. The first diameter D1 is smaller than the third diameter D3. The side wall portion forms an annular step surface 44 between the large diameter portion and the small diameter portion. The step surface 44 can abut the bottom portion 514 of the connecting seat, which can limit the valve core 3 from moving upward. The first diameter D1 is smaller than the second diameter D2. The screw rod 31 also includes a guide portion on the upper side of the flange portion. The guide portion is in clearance fit with the top portion that forms the through hole. The guide portion extends into the valve core cavity and extends in a direction parallel to the side wall portion of the valve core.

[0039] In combination with Figure 10 and Figure 11 In this embodiment, the valve core 4 is in close fit with the valve port 51. The lower cavity portion filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2. The third diameter D3 is larger than the second diameter D2. The surface formed by this portion is subjected to the first pressure F1 axially upward. The third diameter D3 is larger than the first diameter D1, and the step surface is subjected to the fourth pressure F4 downward. The valve core is also subjected to its own gravity. In addition to the action of the screw rod, the valve core is subjected to the resultant force F 合 F1-F4-G, where Since the first diameter D1 is smaller than the second diameter D2, the valve core is subjected to the resultant force F 合The resultant force is axially downward; the stator part 1 drives the rotor part 2 to rotate, and when the rotor part 2 drives the transmission part 3 to move axially upward, the screw rod 31 pulls the valve core 4 to open the valve port upward; when the rotor part 2 drives the transmission part 3 to move axially downward, the valve core 4 is gradually closed with the valve port along with the transmission part 3 moving axially and downward under the action of the resultant force axially and downward, thereby achieving flow regulation.

[0040] For reference Figure 10 and Figure 12 In this embodiment, the working medium enters from the second port 53, the valve core 4 is tightly matched with the valve port 51, the valve core cavity is communicated with the upper cavity through the communication hole 421, and the pressure in the two cavities is the first pressure P1; since the first diameter D1 is greater than the fourth diameter D4, the valve core 4 is subjected to the third force F3 axially downward, Since the second diameter D2 is greater than the fourth diameter D4, the valve core 4 is subjected to the second force F2 axially upward, In addition to the action of the screw rod on the valve core, the resultant force F 合 is F2-F3-G, Since the second diameter D1 is greater than the first diameter D2, the valve core 4 is subjected to the resultant force axially upward under the condition that the weight is ignored, the valve core does not need to be driven by the transmission part, the valve core is separated from the valve port, and the normally open mode of the valve port is achieved.

[0041] Figures 13 to 16 It is a schematic view of the fourth embodiment of the electric valve, and the main difference compared with the third embodiment is that the first diameter D1 is equal to the third diameter D3, there is no step surface 44, the valve core 4 has a through hole capable of accommodating the screw rod 31 to pass through, the lower end of the screw rod 31 has a flange part, the screw rod 31 passes through the through hole from the inside of the valve core 4, the flange part abuts against the inner side of the top part, and when the transmission part 3 moves axially upward, the valve core 5 is pulled to gradually move away from the valve port, thereby achieving large flow opening.

[0042] For reference Figure 14 and Figure 16 In this embodiment, the valve core 4 is in a state of being tightly matched with the valve port 51, the medium enters from the second port 53, the valve core 4 is tightly matched with the valve seat 51, the valve core cavity 43 is communicated with the upper cavity through the communication hole 421, and the pressure in the two cavities is the first pressure P1; in addition to the action of the screw rod on the valve core, the resultant force F 合 of the action on the valve core is F2-F3-G, wherein When the first diameter D1 is greater than the second diameter D2, the resultant force F 合Down, the valve core 4 as a whole is always subjected to the axial downward force, the valve core 4 and the valve seat 2 fit closely, the stator component 1 drives the rotor component 2 to rotate, when the transmission component 3 moves axially upward, the screw rod 31 pulls the valve core 4 to open the valve port upward; when the rotor component 2 drives the transmission component 3 to move axially downward, the valve core 4 is subjected to the combined force along the axial direction and downward, and gradually closes the valve port along with the transmission component 3 moving axially and downward, so as to realize the flow regulation.

[0043] In combination with Figure 14 and Figure 15 In the embodiment, the medium passes from the first port 52 into the state that the valve core 4 and the valve port 51 fit closely, and the lower cavity part filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the first diameter D1 is larger than the second diameter D2, the formed surface of the part is subjected to the first pressure F1 along the axial direction upward, and the valve core is also subjected to the action of its own gravity; in addition to the action of the screw rod, the combined force of the action force on the valve core is F1-G; when the combined force is upward, the electric valve works, and when the rotor component 2 drives the transmission component 3 to move axially upward, the valve core 4 is subjected to the combined force along the axial direction and upward, and gradually opens the valve port along with the transmission component 3 moving axially and upward. The first pressure To realize the direction of F1-G upward, the valve port can be opened, and it is required to ensure that the first diameter D1 is larger than the second diameter D2. In the technical scheme, after the valve port is opened, the valve core cannot be closed, and the electric valve is in the open state.

[0044] As Figure 17 In the embodiment, the valve seat 5 is fixedly connected with the connecting seat 50 through welding, the connecting seat 50 includes the first step surface 511, the second step surface 512, the third step surface 513 and the bottom surface 514; the first step 511 is fixedly connected with the connecting part 6 through welding; the second step surface 512 abuts against the bottom surface of the cover body 6; the connecting part 6 and the connecting seat 50 are provided with the sealing element 8, the sealing element 8 is located on the third step surface 513, and the sealing element 8 prevents the working medium from leaking out.

[0045] The electric valve includes the top dead point, the top dead point limits the valve core 4 to continue to move upward, and when the valve core moves away from the valve port and moves upward to the top dead point, the step surface 44 can abut against the top dead point. The electric valve further includes the connecting seat 51, the connecting seat 51 is fixedly connected with the valve seat 5, the connecting seat 51 forms the guide hole 501, the small-diameter part extends into the guide hole, and the top dead point is located at the bottom 514 of the connecting seat. The electric valve further includes the cover body 6 and the connecting cover 7, part of the cover body 6 is located between the rotor component and the stator component, and the cover body 6 forms the upper cavity; the connecting cover 7 is located at the end of the cover body 6 and is fixedly connected with the cover body 6, and the connecting cover 7 is fixedly connected with the nut.

[0046] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. An electric valve comprising a driving part, a transmission part, a valve core and a valve seat; the electric valve further comprises an upper cavity and a lower cavity, the transmission part is located in the upper cavity, the lower cavity is shaped in the valve seat; the driving part drives the transmission part to move, the transmission part drives the valve core to move, the valve core can move up and down along the axial direction; the electric valve has a valve port, a first port and a second port, the valve port is located between the first port and the second port, the first port communicates with the lower cavity, the second port communicates with the lower cavity through the valve port; characterized in that: The valve core comprises a transmission contact part, which can be pushed downward by the transmission part, and the valve core is not affected by the upward pulling force of the transmission part; The valve core comprises a top part and a side wall part, the side wall part and the top part surround a valve core cavity, the transmission contact part is located on the top part, the transmission part is located outside the top part and can abut against the top part of the valve core, the valve core has a communication hole that communicates the upper cavity and the valve core cavity; When the area surrounded by the outer edge of the top part is smaller than the flow area of the valve port, the valve core cannot open the valve port when the first port is used as the inlet, and the valve core can open and close the valve port when the second port is used as the inlet. Alternatively, when the area surrounded by the outer edge of the top part is larger than the flow area of the valve port, the valve core can open and close the valve port when the first port is used as the inlet, and the valve core cannot open the valve port when the second port is used as the inlet.

2. The motorized valve of claim 1, wherein: The electric valve further comprises a rotor part, the transmission part comprises a screw rod and a nut; the screw rod or the nut is fixedly connected with the rotor part; the outer wall of the screw rod has external threads; the nut has internal threads, the screw rod and the nut are connected through threads, and the end of the screw rod or the nut abuts against the transmission contact part.

3. The motorized valve of claim 1, wherein: The valve core comprises a small-diameter part, a large-diameter part and a step part, the outer edge of the small-diameter part is arranged in alignment with the outer edge of the top part, the equivalent outer diameter of the large-diameter part is larger than the equivalent outer diameter of the small-diameter part, the step part is formed between the large-diameter part and the small-diameter part, the small-diameter part is located between the top part and the step part, and the large-diameter part is located on the other side of the step part; when the valve core moves away from the valve port and upward, the step part abuts against the top dead center to limit the valve core from continuing to move upward.

4. The motorized valve of claim 3, wherein: The valve core further comprises an abutment part, the abutment part is matched with the valve port, the abutment part is located at one end of the side wall part, the abutment part has a slope or arc surface structure, the outer diameter of the abutment part gradually increases from the free end of the abutment part to the large-diameter part, and at least part of the abutment part is located in the lower cavity.

5. The motorized valve of claim 4, wherein: The electric valve further comprises a connecting seat, the connecting seat is fixedly connected with the valve seat, the connecting seat forms a guide hole, the small-diameter part extends into the guide hole, and the top dead center is located at the bottom of the connecting seat.

6. The motorized valve of claim 5, wherein: The outer periphery of the small-diameter part and the outer periphery of the large-diameter part are in a cylindrical shape, and the diameter of the small-diameter part is smaller than the diameter of the large-diameter part.

7. The motorized valve of claim 5, wherein: The outer periphery of the small-diameter part and the outer periphery of the large-diameter part correspondingly have rectangular cross sections, the equivalent diameter of the small-diameter part is smaller than the equivalent diameter of the large-diameter part, the valve port is rectangular, and the abutment part is matched with the valve port.

8. The motorized valve of claim 2, wherein: The electric valve further comprises a cover body, a connecting cover and a stator part, part of the cover body is located between the rotor part and the stator part, the cover body forms the upper cavity, the connecting cover is located at the end of the cover body and is fixedly connected with the cover body, and the connecting cover is fixedly connected with the nut.

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