Plug, plug-in assembly and electric valve

Abstract

The invention provides a plug, a plugging assembly and an electrically operated valve, the plug comprises an insulation wrapping head, a plurality of lead structures and an annular sealing member, the insulation wrapping head wraps the end portions of the plurality of lead structures, and the annular sealing member is arranged around the plurality of lead structures; wherein the ends of the plurality of lead structures are used for being correspondingly connected with the plurality of wiring needles in an inserted mode, the annular sealing piece is located on one side, used for being inserted into the binding post, of the insulation wrapping head, and when the plug is inserted into the binding post, the annular sealing piece is in sealing fit with the insulation wrapping head and the insulation fixing structure. According to the scheme, the plug is provided with the annular sealing element, after the plug is inserted into the binding post, the annular sealing element surrounds the multiple lead structures and the multiple wiring needles, and the annular sealing element is in sealing fit with the insulation wrapping head and the insulation fixing structure; impurities are prevented from entering the connection position of the lead structure and the wiring needle through the gap between the insulation wrapping head and the insulation fixing structure, so that the problem of short circuit caused by the fact that the impurities enter the connection position is avoided, and the product reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of electric valve technology, and more specifically, to a plug, a connector assembly, and an electric valve. Background Technology

[0002] Electric valves require a power supply connection via a plug-in assembly. The plug-in assembly mainly includes a plug and terminals. The terminals contain pins and an insulating structure to hold them in place. The plug has an insulating sheath covering the end of the lead wire. During use, the insulating sheath is inserted into the terminal to connect the lead wire to the pins inside the terminal.

[0003] However, the poor sealing effect between the insulating wrapping head and the insulating fixing structure allows impurities such as sludge to enter the lead structure and the connection position of the connector pin through the gap. After the impurities accumulate, short circuits are likely to occur. Summary of the Invention

[0004] This invention provides a plug, a connector assembly, and an electric valve to solve the problem that impurities can easily enter the connector assembly in the prior art, causing short circuits.

[0005] To address the aforementioned problems, according to one aspect of the present invention, a plug is provided for insertion into a terminal block. The terminal block has multiple pins and an insulating fixing structure for fixing the multiple pins. The plug includes an insulating wrapping head, multiple lead structures, and an annular seal. The insulating wrapping head wraps around the ends of the multiple lead structures, and the annular seal is disposed around the multiple lead structures. The ends of the multiple lead structures are used to correspondingly connect with the multiple pins. The annular seal is located on the side of the insulating wrapping head used for insertion into the terminal block. When the plug is inserted into the terminal block, the annular seal, the insulating wrapping head, and the insulating fixing structure all form a sealing fit.

[0006] Furthermore, the insulating wrapping head has an annular sealing groove on the side for insertion into the terminal block, the annular sealing groove is arranged around multiple lead wire structures, and the annular seal is installed in the annular sealing groove.

[0007] Furthermore, the annular seal is an O-ring; or, the annular seal is a gasket.

[0008] Furthermore, the insulating wrapping head has a mating hole, the end of the lead structure is located in the mating hole, and the plug also includes a sealing sleeve, which is fitted onto the end of the lead structure. At least a portion of the sealing sleeve is located in the mating hole, the inner wall of the sealing sleeve and the lead structure are sealed together, and the outer wall of the sealing sleeve and the inner wall of the mating hole are sealed together.

[0009] Furthermore, the inner wall of the sealing sleeve and the lead wire structure are interference-fitted, and / or the outer wall of the sealing sleeve and the inner wall of the mating hole are interference-fitted.

[0010] Furthermore, the sealing sleeve has a first limiting ring and a second limiting ring at its two ends, respectively. The first limiting ring is in a limiting fit with the end face where the opening at one end of the mating hole is located, and the second limiting ring is in a limiting fit with the end face where the opening at the other end of the mating hole is located.

[0011] Furthermore, the mating hole includes a stepped large hole section and a small hole section, with a stop surface between the large hole section and the small hole section, and the small hole section is farther away from the annular seal relative to the large hole section; the sealing sleeve includes a large sleeve section, a transition ring and a small sleeve section connected in sequence, wherein the large sleeve section is located inside the large hole section, the small sleeve section is located inside the small hole section, and the transition ring and the stop surface stop fit.

[0012] Furthermore, the lead structure includes a lead body and a terminal. One end of the lead body is connected to the terminal. The diameter of the terminal is larger than the diameter of the lead body. The terminal is located within a large sleeve. The lead body passes through a small sleeve. The terminal is used to connect to a connector pin.

[0013] According to another aspect of the present invention, a plug-in assembly is provided, the plug-in assembly including a terminal block, an insulating fixing structure, a plurality of pins and the plug described above, an insulating wrapped head inserted into the terminal block, the ends of a plurality of lead structures and a plurality of pins correspondingly plugged in, and an annular seal located between the insulating wrapped head and the insulating fixing structure, and the annular seal is in a sealing fit with both the insulating wrapped head and the insulating fixing structure.

[0014] Furthermore, the outer circumferential surface of the insulating wrapping head and the inner wall of the terminal block are interference-fitted.

[0015] Furthermore, a limiting structure is provided between the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal block, the limiting structure defining the axial position of the insulating wrapping head on the terminal block.

[0016] Furthermore, the limiting structure includes a limiting groove and a limiting protrusion. The limiting groove is disposed on one of the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal block, and the limiting protrusion is disposed on the other of the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal block. The limiting protrusion is engaged in the limiting groove.

[0017] Furthermore, the end of the insulating fixing structure facing the insulating wrapping head has an annular sealing groove, which is arranged around multiple lead wire structures, and the annular seal is installed in the annular sealing groove.

[0018] Furthermore, the connector assembly also includes a top insulating layer located on the end face of the insulating fixing structure opposite to the plug and on the inner wall of the terminal block, and the top insulating layer is sealed to the inner wall of the terminal block, with the terminal pin passing through the top insulating layer.

[0019] According to another aspect of the present invention, an electric valve is provided, the electric valve including a housing, a coil assembly and the aforementioned plug-in assembly, the coil assembly being located inside the housing, the coil assembly being connected to a lead wire structure, and one end of the housing being connected to one end of a terminal block.

[0020] The present invention provides a plug for insertion into a terminal block. The terminal block contains multiple pins and an insulating fixing structure for securing the pins. The plug includes an insulating wrapping head, multiple lead structures, and an annular seal. The insulating wrapping head wraps around the ends of the multiple lead structures, and the annular seal surrounds the multiple lead structures. The ends of the multiple lead structures are used to connect with the multiple pins. The annular seal is located on the side of the insulating wrapping head where the plug is inserted into the terminal block. When the plug is inserted into the terminal block, the annular seal, the insulating wrapping head, and the insulating fixing structure all form a sealed fit. In this design, the plug has an annular seal, and after insertion into the terminal block, the annular seal surrounds the multiple lead structures and multiple pins, and the annular seal, the insulating wrapping head, and the insulating fixing structure all form a sealed fit. This prevents impurities from entering the connection points of the lead structures and pins through the gap between the insulating wrapping head and the insulating fixing structure, thereby avoiding short circuits caused by impurities entering the connection points and improving product reliability. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A schematic diagram of the plug provided in an embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of the structure of the insulating wrapping head;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the sealing sleeve in the middle;

[0025] Figure 4 A schematic diagram of the structure of the plug-in assembly provided in an embodiment of the present invention is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Insulating wrapping head; 11. Annular sealing groove; 12. Mating hole; 121. Large hole section; 122. Small hole section; 123. Stop surface;

[0028] 20. Lead wire structure; 21. Lead wire body; 22. Terminal;

[0029] 30. Annular seal;

[0030] 40. Sealing sleeve; 41. Large sleeve section; 42. Transition ring; 43. Small sleeve section; 44. First limiting ring; 45. Second limiting ring;

[0031] 50. Terminal block;

[0032] 60. Connecting pin;

[0033] 70. Insulating fixing structure;

[0034] 80. Limiting structure; 81. Limiting groove; 82. Limiting protrusion;

[0035] 90. Top insulation layer. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] like Figures 1 to 4 As shown, an embodiment of the present invention provides a plug for insertion into a terminal block 50. The terminal block 50 has multiple pins 60 and an insulating fixing structure 70 for fixing the multiple pins 60. The plug includes an insulating wrapping head 10, multiple lead wire structures 20, and an annular seal 30. The insulating wrapping head 10 wraps the ends of the multiple lead wire structures 20, and the annular seal 30 is arranged around the multiple lead wire structures 20. The ends of the multiple lead wire structures 20 are used to be inserted into the multiple pins 60 respectively. The annular seal 30 is located on the side of the insulating wrapping head 10 used for insertion into the terminal block 50. When the plug is inserted into the terminal block 50, the annular seal 30 is sealed in place with the insulating wrapping head 10 and the insulating fixing structure 70.

[0038] In this design, the plug has an annular seal 30. After the insulating head 10 of the plug is inserted into the terminal 50, the annular seal 30 surrounds multiple lead structures 20 and multiple terminal pins 60. The annular seal 30, the insulating head 10, and the insulating fixing structure 70 all form a sealed fit. This prevents impurities from entering the connection positions of the lead structures 20 and terminal pins 60 through the gap between the insulating head 10 and the insulating fixing structure 70, thus avoiding short circuits caused by impurities entering the connection positions. Applying this plug to an electric valve improves product reliability.

[0039] Specifically, such as Figure 1 As shown, the insulating wrapping head 10 has an annular sealing groove 11 on one side for inserting into the terminal block 50. The annular sealing groove 11 is arranged around a plurality of lead wire structures 20, and the annular seal 30 is installed in the annular sealing groove 11.

[0040] The annular sealing groove 11 can be used to position the annular seal 30, ensuring accurate installation and thus guaranteeing the sealing effect.

[0041] Among them, the annular seal 30 can be an O-ring, and the axial cross-sectional shape of the annular seal 30 is circular.

[0042] Alternatively, the annular seal 30 can also be a gasket, and the axial cross-sectional shape of the annular seal 30 can be rectangular, rhomboid, or other shapes. The axial direction of the annular seal 30 is also the insertion direction of the plug.

[0043] Of course, other types of sealing structures can also be selected for the annular seal 30 as needed.

[0044] Furthermore, the insulating wrapping head 10 has a mating hole 12, the end of the lead wire structure 20 is located in the mating hole 12, and the plug also includes a sealing sleeve 40, which is sleeved on the end of the lead wire structure 20. At least a portion of the sealing sleeve 40 is located in the mating hole 12, the inner wall of the sealing sleeve 40 and the lead wire structure 20 are sealed together, and the outer wall of the sealing sleeve 40 and the inner wall of the mating hole 12 are sealed together.

[0045] By sealing the inner wall of the sealing sleeve 40 with the lead wire structure 20, and sealing the outer wall of the sealing sleeve 40 with the inner wall of the mating hole 12, the sealing effect between the insulating wrapping head 10 and the lead wire structure 20 is improved. This avoids short circuits caused by impurities or fluid from the electric valve entering the connection position between the lead wire structure 20 and the connecting pin 60 through gaps between the insulating wrapping head 10 and the lead wire structure 20.

[0046] The insulating wrapping head 10 can be made of plastic, and the sealing sleeve 40 can be made of rubber. The insulating fixing structure 70 can be processed by injection molding or potting.

[0047] Furthermore, the inner wall of the sealing sleeve 40 and the lead wire structure 20 are interference-fitted, and / or the outer wall of the sealing sleeve 40 and the inner wall of the mating hole 12 are interference-fitted. By adopting the interference fit, the sealing sleeve 40 can fill the gap between the insulating wrapping head 10 and the lead wire structure 20, ensuring the sealing effect and preventing impurities and fluids from entering.

[0048] Furthermore, such as Figure 1 and Figure 3As shown, the sealing sleeve 40 has a first limiting ring 44 and a second limiting ring 45 at its two ends. The first limiting ring 44 is limited to the end face where the opening at one end of the mating hole 12 is located, and the second limiting ring 45 is limited to the end face where the opening at the other end of the mating hole 12 is located.

[0049] The first limiting ring 44 can seal any gaps that may exist around the opening of the large-hole section 121 and can also limit the sealing sleeve 40 axially; the second limiting ring 45 can seal any gaps that may exist around the opening of the small-hole section 122 and can also limit the sealing sleeve 40 axially. This prevents the sealing sleeve 40 from being squeezed out due to unbalanced pressure differences at both ends of the sealing sleeve 40 and improves the sealing effect. Therefore, this arrangement improves connection reliability and sealing effect.

[0050] like Figures 1 to 3 As shown, the mating hole 12 includes a stepped large hole section 121 and a small hole section 122, with a stop surface 123 between the large hole section 121 and the small hole section 122. The small hole section 122 is away from the annular seal 30 relative to the large hole section 121. The sealing sleeve 40 includes a large sleeve section 41, a transition ring 42, and a small sleeve section 43 connected in sequence. The large sleeve section 41 is located inside the large hole section 121, and the small sleeve section 43 is located inside the small hole section 122. The transition ring 42 and the stop surface 123 are in a stop fit.

[0051] With the above configuration, the mating hole 12 is a stepped hole, and the sealing sleeve 40 is also a stepped structure with a shape that matches the mating hole 12. Through the cooperation of the transition ring 42 and the stop surface 123, the sealing sleeve 40 and the insulating wrapping head 10 can be mutually limited in the axial direction, which avoids the sealing sleeve 40 and the lead wire structure 20 from coming out of the mating hole 12 due to the uneven pressure at both ends of the insulating wrapping head 10, thus improving the connection reliability.

[0052] like Figure 1 As shown, the lead structure 20 includes a lead body 21 and a terminal 22. One end of the lead body 21 is connected to the terminal 22. The diameter of the terminal 22 is larger than the diameter of the lead body 21. The terminal 22 is located inside the large sleeve 41, and the lead body 21 passes through the small sleeve 43. The terminal 22 is used to connect with the connector pin 60. In this way, the stepped sealing sleeve 40 can axially limit the lead structure 20, preventing the lead structure 20 from coming out of the sealing sleeve 40 due to tension or fluid pressure.

[0053] like Figure 4As shown, the present invention also provides a plug-in assembly, which includes a terminal block 50, an insulating fixing structure 70, a plurality of pins 60 and the plug described above. An insulating wrapping head 10 is inserted into the terminal block 50, the ends of the plurality of lead wire structures 20 are correspondingly plugged into the plurality of pins 60, and an annular seal 30 is located between the insulating wrapping head 10 and the insulating fixing structure 70, and the annular seal 30 is sealed to both the insulating wrapping head 10 and the insulating fixing structure 70.

[0054] In this design, the plug has an annular seal 30. After the insulating head 10 of the plug is inserted into the terminal 50, the annular seal 30 surrounds multiple lead structures 20 and multiple terminal pins 60. The annular seal 30, the insulating head 10, and the insulating fixing structure 70 all form a sealed fit. This prevents impurities from entering the connection position of the lead structure 20 and the terminal pins 60 through the gap between the insulating head 10 and the insulating fixing structure 70, thus avoiding short circuits caused by impurities entering the connection position. Applying this plug to an electric valve improves the product's reliability.

[0055] The outer peripheral surface of the insulating head 10 and the inner wall of the terminal 50 are interference-fitted. This interference fit ensures a good seal between the outer peripheral surface of the insulating head 10 and the inner wall of the terminal 50, preventing impurities or fluids from entering the terminal 50 through the gap between them. This reliable connection also prevents the insulating head 10 from detaching from the terminal 50 due to pressure imbalance at both ends.

[0056] Furthermore, a limiting structure 80 is provided between the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal 50, the limiting structure 80 defining the axial position of the insulating wrapping head 10 within the terminal 50. The limiting structure 80 further improves the connection reliability between the insulating wrapping head 10 and the terminal 50, preventing the insulating wrapping head 10 from detaching from the terminal 50. Moreover, by reliably defining the axial position of the insulating wrapping head 10 and the terminal 50, a reliable relative position can be maintained between the insulating wrapping head 10 and the insulating fixing structure 70, ensuring that they clamp the annular seal 30 and reliably seal with it.

[0057] Specifically, the limiting structure 80 includes a limiting groove 81 and a limiting protrusion 82. The limiting groove 81 is located on one of the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal 50, and the limiting protrusion 82 is located on the other of the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal 50. The limiting protrusion 82 is engaged in the limiting groove 81. This method results in a simple structure and convenient assembly and disassembly.

[0058] In one embodiment, the limiting grooves 81 and the limiting protrusions 82 are all annular. Alternatively, in other embodiments, there are multiple limiting grooves 81 spaced apart, and multiple limiting protrusions 82 spaced apart, with each limiting protrusion 82 corresponding to a one-to-one relationship with the multiple limiting grooves 81.

[0059] In an embodiment not shown, the insulating fixing structure 70 has an annular sealing groove 11 at one end facing the insulating wrapping head 10. The annular sealing groove 11 is arranged around a plurality of lead wire structures 20, and the annular seal 30 is installed within the annular sealing groove 11. The annular sealing groove 11 enables the annular seal 30 to be positioned, ensuring accurate installation and thus guaranteeing a sealing effect.

[0060] like Figure 4 As shown, the connector assembly also includes a top insulating layer 90, which is located on the end face of the insulating fixing structure 70 opposite to the plug and on the inner wall of the terminal 50. The terminal 60 passes through the top insulating layer 90. This provides protection for the terminal 60. The top insulating layer 90 can be made of rubber or plastic. Furthermore, the top insulating layer 90 and the inner wall of the terminal 50 form a sealed fit, preventing impurities from entering between the insulating fixing structure 70 and the insulating cover head 10 through the gap between them.

[0061] The present invention also provides an electric valve, which includes a housing, a coil assembly, and the aforementioned plug-in assembly. The coil assembly is located inside the housing and is connected to the lead wire structure 20. One end of the housing is connected to one end of the terminal block 50. The connection can be achieved by welding for fixation and sealing. The plug-in assembly is connected to an external power source to power the coil assembly.

[0062] In the above scheme, an annular seal 30 is provided at the top of the insulating wrap head 10 to prevent sludge and impurities from entering the connection position through the side gap; a sealing sleeve 40 is provided inside the insulating wrap head 10. The sealing sleeve 40 is I-shaped to prevent the sealing sleeve 40 from being squeezed out due to unbalanced pressure difference. The sealing sleeve 40 and the mating hole 12 inside the insulating wrap head 10 adopt an interference fit to prevent solid and liquid impurities from entering the connection position through the gap of the mating hole 12; in addition, the sealing sleeve 40 can completely wrap the terminals and wiring pins after they are inserted and connected, thereby isolating the short circuit caused by solid and liquid impurities; there is an interference fit between the insulating wrap head 10 and the bottom inner hole of the terminal 50. The bottom inner hole of the terminal 50 is provided with a limiting groove, and the outside of the insulating wrap head 10 is provided with a limiting protrusion to achieve axial limiting fit and prevent the insulating wrap head 10 from falling off due to unbalanced internal and external pressure.

[0063] The above description is merely an optional embodiment of this solution and is not intended to limit the solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this solution should be included within the scope of protection of this solution.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0066] In the description of this solution, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this solution and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this solution. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this solution.

Claims

1. A plug for insertion into a terminal post (50), the terminal post (50) having a plurality of pins (60) and an insulating fixing structure (70) for fixing the plurality of pins (60), characterized in that, The plug includes an insulating wrapping head (10), multiple lead wire structures (20), and an annular seal (30). The insulating wrapping head (10) wraps around the ends of the multiple lead wire structures (20), and the annular seal (30) is arranged around the multiple lead wire structures (20). The ends of the multiple lead wire structures (20) are used to be inserted into the multiple terminal pins (60). The annular seal (30) is located on the side of the insulating wrapping head (10) used to insert into the terminal (50). When the plug is inserted into the terminal (50), the annular seal (30) is sealed in conjunction with the insulating wrapping head (10) and the insulating fixing structure (70).

2. The plug according to claim 1, characterized in that, The insulating wrapping head (10) has an annular sealing groove (11) on one side for insertion into the terminal block (50), the annular sealing groove (11) is arranged around the plurality of lead structures (20), and the annular seal (30) is installed in the annular sealing groove (11).

3. The plug according to claim 1, characterized in that, The annular seal (30) is an O-ring; Alternatively, the annular seal (30) may be a sealing gasket.

4. The plug according to claim 1, characterized in that, The insulating wrapping head (10) has a mating hole (12), the end of the lead wire structure (20) is located in the mating hole (12), the plug also includes a sealing sleeve (40), the sealing sleeve (40) is sleeved on the end of the lead wire structure (20), at least a part of the sealing sleeve (40) is located in the mating hole (12), the inner wall of the sealing sleeve (40) and the lead wire structure (20) are sealed together, and the outer wall of the sealing sleeve (40) and the inner wall of the mating hole (12) are sealed together.

5. The plug according to claim 4, characterized in that, The inner wall of the sealing sleeve (40) and the lead wire structure (20) are interference-fitted, and / or the outer wall of the sealing sleeve (40) and the inner wall of the mating hole (12) are interference-fitted.

6. The plug according to claim 4, characterized in that, The sealing sleeve (40) has a first limiting ring (44) and a second limiting ring (45) at both ends. The first limiting ring (44) is in a limiting fit with the end face where the opening at one end of the mating hole (12) is located, and the second limiting ring (45) is in a limiting fit with the end face where the opening at the other end of the mating hole (12) is located.

7. The plug according to claim 4, characterized in that, The mating hole (12) includes a stepped large hole section (121) and a small hole section (122), with a stop surface (123) between the large hole section (121) and the small hole section (122), and the small hole section (122) is away from the annular seal (30) relative to the large hole section (121); the sealing sleeve (40) includes a large sleeve section (41), a transition ring (42) and a small sleeve section (43) connected in sequence, wherein the large sleeve section (41) is located inside the large hole section (121), the small sleeve section (43) is located inside the small hole section (122), and the transition ring (42) and the stop surface (123) are in a stop fit.

8. The plug according to claim 7, characterized in that, The lead structure (20) includes a lead body (21) and a terminal (22). One end of the lead body (21) is connected to the terminal (22). The diameter of the terminal (22) is larger than the diameter of the lead body (21). The terminal (22) is located inside the large sleeve (41). The lead body (21) passes through the small sleeve (43). The terminal (22) is used to connect with the connector (60).

9. A plug-in assembly, characterized in that, The plug assembly includes a terminal block (50), an insulating fixing structure (70), a plurality of pins (60), and a plug according to any one of claims 1 to 8. The insulating wrapping head (10) is inserted into the terminal block (50), and the ends of the plurality of lead wire structures (20) and the plurality of pins (60) are correspondingly plugged in. The annular seal (30) is located between the insulating wrapping head (10) and the insulating fixing structure (70), and the annular seal (30) is in a sealing fit with both the insulating wrapping head (10) and the insulating fixing structure (70).

10. The plug-in assembly according to claim 9, characterized in that, The outer peripheral surface of the insulating wrapping head (10) and the inner wall of the terminal (50) are interference-fitted.

11. The plug-in assembly according to claim 9, characterized in that, A limiting structure (80) is provided between the outer peripheral surface of the insulating wrapping head (10) and the inner wall of the terminal (50), the limiting structure (80) defining the axial position of the insulating wrapping head (10) on the terminal (50).

12. The plug-in assembly according to claim 11, characterized in that, The limiting structure (80) includes a limiting groove (81) and a limiting protrusion (82). The limiting groove (81) is disposed on one of the outer peripheral surface of the insulating wrapping head (10) and the inner wall of the terminal (50). The limiting protrusion (82) is disposed on the other of the outer peripheral surface of the insulating wrapping head (10) and the inner wall of the terminal (50). The limiting protrusion (82) is engaged in the limiting groove (81).

13. The plug-in assembly according to claim 9, characterized in that, The insulating fixing structure (70) has an annular sealing groove (11) at one end facing the insulating wrapping head (10), the annular sealing groove (11) is arranged around the plurality of lead wire structures (20), and the annular seal (30) is installed in the annular sealing groove (11).

14. The plug-in assembly according to claim 9, characterized in that, The plug assembly further includes a top insulating layer (90), which is located on the end face of the insulating fixing structure (70) opposite to the plug and on the inner wall of the terminal (50), and the top insulating layer (90) is sealed to the inner wall of the terminal (50), and the pin (60) passes through the top insulating layer (90).

15. An electric valve, characterized in that, The electric valve includes a housing, a coil assembly, and a plug-in assembly as described in any one of claims 9 to 14, wherein the coil assembly is located inside the housing and is connected to the lead structure (20), and one end of the housing is connected to one end of the terminal block (50).

Images