Plug, plug-in assembly and electric valve

Abstract

The utility model provides a plug, a plugging assembly and an electrically operated valve, the plug comprises an insulation wrapping head, a plurality of lead wire structures and an annular sealing member, the insulation wrapping head wraps the end portions of the plurality of lead wire structures, and the annular sealing member is arranged around the plurality of lead wire 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] The utility model relates to the technical field of electric valves, and in particular, to a plug, a plug-in assembly and an electric valve. Background Art

[0002] In an electric valve, a plug-in assembly is required to connect a power supply. The plug-in assembly mainly includes structures such as a plug and a terminal post. The terminal post has a wiring pin and an insulating fixing structure for fixing the wiring pin. The insulating wrapping head in the plug wraps the end of the lead structure. When in use, the insulating wrapping head is inserted into the terminal post to realize the connection between the lead structure and the wiring pin in the terminal post.

[0003] However, the sealing effect between the insulating wrapping head and the insulating fixing structure is poor, and impurities such as sludge can enter the connection position between the lead structure and the wiring pin through the gap. After the impurities accumulate, a short circuit problem is likely to occur. Summary of the Utility Model

[0004] The utility model provides a plug, a plug-in assembly and an electric valve to solve the problem that impurities easily enter the plug-in assembly in the prior art, resulting in a short circuit.

[0005] To solve the above problems, according to one aspect of the utility model, a plug is provided for inserting into a terminal post. The terminal post has a plurality of wiring pins and an insulating fixing structure for fixing the plurality of wiring pins. The plug includes an insulating wrapping head, a plurality of lead structures and an annular seal. The insulating wrapping head wraps the ends of the plurality of lead structures, and the annular seal is arranged around the plurality of lead structures. Wherein, the ends of the plurality of lead structures are used for corresponding plugging with the plurality of wiring pins, and the annular seal is located on the side of the insulating wrapping head for inserting into the terminal post. When the plug is inserted into the terminal post, the annular seal is in sealing cooperation with both the insulating wrapping head and the insulating fixing structure.

[0006] Further, the side of the insulating wrapping head for inserting into the terminal post has an annular seal groove arranged around the plurality of lead structures, and the annular seal is installed in the annular seal groove.

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

[0008] Further, the insulating wrapping head has a mating hole, and the end of the lead structure is located in the mating hole. The plug further includes a sealing sleeve sleeved on the end of the lead structure. At least a part of the sealing sleeve is located in the mating hole. The inner wall of the sealing sleeve is in sealing cooperation with the lead structure, and the outer wall of the sealing sleeve is in sealing cooperation with the inner wall of the mating hole.

[0009] Further, the inner wall of the sealing sleeve is in interference fit with the lead structure, and / or the outer wall of the sealing sleeve is in interference fit with the inner wall of the mating hole.

[0010] Furthermore, the two ends of the sealing sleeve respectively have a first limiting ring and a second limiting ring, the first limiting ring and the end face where the opening of one end of the matching hole is located are limitedly matched, and the second limiting ring and the end face where the opening of the other end of the matching hole is located are limitedly matched.

[0011] Furthermore, the matching hole includes a large hole section and a small hole section arranged in a step manner, a stop surface is provided between the large hole section and the small hole section, and the small hole section is 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 in the large hole section, the small sleeve section is located in the small hole section, and the transition ring and the stop surface are matched with each other.

[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 in the large sleeve section, the lead body passes through the small sleeve section, and the terminal is used to connect with the wiring pin.

[0013] According to another aspect of the utility model, a plug-in assembly is provided, which includes a terminal post, an insulating fixing structure, a plurality of terminal pins and the above-mentioned plug, wherein an insulating wrapped head is inserted into the terminal post, ends of a plurality of lead structures are correspondingly plugged into the plurality of terminal pins, an annular seal is located between the insulating wrapped head and the insulating fixing structure, and the annular seal is sealed with the insulating wrapped head and the insulating fixing structure.

[0014] Furthermore, the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal are interference fit.

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

[0016] Furthermore, the limiting structure includes a limiting groove and a limiting protrusion, the limiting groove is arranged on one of the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal, the limiting protrusion is arranged on the other of the outer peripheral surface of the insulating wrapping head and the inner wall of the terminal, and the limiting protrusion is snapped into the limiting groove.

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

[0018] Furthermore, the plug assembly also includes a top insulating layer, which is located on the end surface of the insulating fixing structure away from the plug and the inner wall of the terminal, and the top insulating layer is sealed with the inner wall of the terminal, and the terminal pin passes through the top insulating layer.

[0019] According to another aspect of the present utility model, an electric valve is provided. The electric valve includes a housing, a coil assembly, and the above-mentioned plug-in assembly. The coil assembly is located inside the housing. The coil assembly is connected to the lead structure, and one end of the housing is connected to one end of the terminal block.

[0020] Applying the technical solution of the present utility model, a plug is provided for inserting into the terminal block. The terminal block has a plurality of terminal pins and an insulating fixing structure for fixing the plurality of terminal pins. The plug includes an insulating wrapping head, a plurality of lead structures, and an annular seal. The insulating wrapping head wraps the ends of the plurality of lead structures, and the annular seal is arranged around the plurality of lead structures; wherein, the ends of the plurality of lead structures are used for corresponding plug-in connection with the plurality of terminal pins, and the annular seal is located on the side of the insulating wrapping head for inserting into the terminal block. When the plug is inserted into the terminal block, the annular seal is in sealing cooperation with both the insulating wrapping head and the insulating fixing structure. In this solution, the plug has an annular seal. After the plug is inserted into the terminal block, the annular seal surrounds the plurality of lead structures and the plurality of terminal pins, and the annular seal is in sealing cooperation with both the insulating wrapping head and the insulating fixing structure. This avoids impurities from entering the connection position between the lead structure and the terminal pin through the gap between the insulating wrapping head and the insulating fixing structure, thereby avoiding the problem of short circuit caused by impurities entering the connection position and improving the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 Shows a schematic structural diagram of the plug provided by the embodiment of the present utility model;

[0023] Figure 2 Shows Figure 1 a schematic structural diagram of the insulating wrapping head in

[0024] Figure 3 Shows Figure 1 a schematic structural diagram of the sealing sleeve in

[0025] Figure 4 Shows a schematic structural diagram of the plug-in assembly provided by the embodiment of the present utility model.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 10. Insulating wrapping head; 11. Annular seal groove; 12. Matching hole; 121. Large hole section; 122. Small hole section; 123. Stopping surface;

[0028] 20. Lead structure; 21. Lead 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

[0032] 60. Wiring pin

[0033] 70. Insulating fixing structure

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

[0035] 90. Top insulating layer Detailed implementation manner

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] As Figures 1 to 4 shown, an embodiment of the present invention provides a plug for inserting into a terminal 50. The terminal 50 has a plurality of wiring pins 60 and an insulating fixing structure 70 for fixing the plurality of wiring pins 60. The plug includes an insulating wrapping head 10, a plurality of lead structures 20, and an annular seal 30. The insulating wrapping head 10 wraps the ends of the plurality of lead structures 20, and the annular seal 30 is disposed around the plurality of lead structures 20. Among them, the ends of the plurality of lead structures 20 are used for corresponding plugging with the plurality of wiring pins 60. The annular seal 30 is located on the side of the insulating wrapping head 10 for inserting into the terminal 50. When the plug is inserted into the terminal 50, the annular seal 30 is in sealing cooperation with both the insulating wrapping head 10 and the insulating fixing structure 70.

[0038] In this solution, the plug has an annular seal 30. After the insulating wrapper 10 of the plug is inserted into the terminal 50, the annular seal 30 surrounds a plurality of lead structures 20 and a plurality of terminal pins 60, and the annular seal 30 is in sealing fit with both the insulating wrapper 10 and the insulating fixing structure 70. This avoids impurities from entering the connection position between the lead structure 20 and the terminal pin 60 through the gap between the insulating wrapper 10 and the insulating fixing structure 70, thus avoiding the problem of short circuit caused by impurities entering the connection position. Applying this plug to an electric valve improves the reliability of the product.

[0039] Specifically, as Figure 1 shown, the side of the insulating wrapper 10 for inserting into the terminal 50 has an annular seal groove 11. The annular seal groove 11 is arranged around a plurality of lead structures 20, and the annular seal 30 is installed in the annular seal groove 11.

[0040] The annular seal groove 11 can position the annular seal 30 to ensure an accurate installation position, thus ensuring 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 is rectangular, rhombic or other shapes. The axis of the annular seal 30 is also the plugging direction of the plug.

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

[0044] Furthermore, the insulating wrapper 10 has a mating hole 12. The end of the lead structure 20 is located in the mating hole 12. The plug further includes a sealing sleeve 40. The sealing sleeve 40 is sleeved on the end of the lead 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 is in sealing fit with the lead structure 20, and the outer wall of the sealing sleeve 40 is in sealing fit with the inner wall of the mating hole 12.

[0045] By sealingly mating the inner wall of the sealing sleeve 40 with the lead structure 20 and the outer wall of the sealing sleeve 40 with the inner wall of the mating hole 12, the sealing effect between the insulating wrapper 10 and the lead structure 20 is improved. It is avoided that due to the gap between the insulating wrapper 10 and the lead structure 20, impurities or the fluid in the electric valve enter the connection position between the lead structure 20 and the terminal pin 60 through the gap, causing a short circuit.

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

[0047] Furthermore, the inner wall of the sealing sleeve 40 is in interference fit with the lead structure 20, and / or the outer wall of the sealing sleeve 40 is in interference fit with the inner wall of the mating hole 12. By adopting the interference fit method, the sealing sleeve 40 can fill the gap between the insulating wrapper 10 and the lead structure 20, ensuring the sealing effect and preventing impurities and fluids from entering.

[0048] Furthermore, as Figure 1 and Figure 3 shown, the two ends of the sealing sleeve 40 are respectively provided with a first limiting ring 44 and a second limiting ring 45. The first limiting ring 44 is in 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 limiting fit with the end face where the opening at the other end of the mating hole 12 is located.

[0049] The first limiting ring 44 can block the possible gap at the peripheral edge of the opening of the large hole section 121 and can limit the sealing sleeve 40 axially; the second limiting ring 45 can block the possible gap at the peripheral edge of the opening of the small hole section 122 and can limit the sealing sleeve 40 axially. This prevents the sealing sleeve 40 from being extruded due to the unbalanced pressure difference at both ends of the sealing sleeve 40 and improves the sealing effect. Therefore, this setting improves the connection reliability and the sealing effect.

[0050] As Figures 1 to 3 shown, the mating hole 12 includes a large hole section 121 and a small hole section 122 arranged in a stepped manner. There is a stop surface 123 between the large hole section 121 and the small hole section 122. The small hole section 122 is farther from the annular seal 30 than 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. Among them, the large sleeve section 41 is located in the large hole section 121, the small sleeve section 43 is located in the small hole section 122, and the transition ring 42 is in stop fit with the stop surface 123.

[0051] With the above setting, the mating hole 12 is a stepped hole, and the sealing sleeve 40 is also a stepped structure, with a shape matching that of the mating hole 12. Through the cooperation between the transition ring 42 and the stop surface 123, the sealing sleeve 40 and the insulating wrapper 10 can be axially limited to each other, avoiding the sealing sleeve 40 and the lead structure 20 from disengaging from the mating hole 12 due to unequal pressures at both ends of the insulating wrapper 10 and improving the connection reliability.

[0052] As Figure 1As shown in the figure, 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 that of the lead body 21. The terminal 22 is located within the large sleeve section 41, and the lead body 21 passes through the small sleeve section 43. The terminal 22 is used for plugging into the connection pin 60. In this way, the sealing sleeve 40 with a stepped structure can axially limit the lead structure 20, preventing the lead structure 20 from being pulled out of the sealing sleeve 40 due to tensile force or fluid pressure.

[0053] As Figure 4 shown in the figure, the present utility model also provides a plugging assembly, which includes a terminal post 50, an insulating fixing structure 70, a plurality of connection pins 60, and the above-mentioned plug. The insulating wrapping head 10 is inserted into the terminal post 50. The ends of the plurality of lead structures 20 are correspondingly plugged into the plurality of connection pins 60. 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 sealing cooperation with both the insulating wrapping head 10 and the insulating fixing structure 70.

[0054] In this solution, the plug has an annular seal 30. After the insulating wrapping head 10 of the plug is inserted into the terminal post 50, the annular seal 30 surrounds the plurality of lead structures 20 and the plurality of connection pins 60, and the annular seal 30 is in sealing cooperation with both the insulating wrapping head 10 and the insulating fixing structure 70. In this way, impurities are prevented from entering the connection position between the lead structure 20 and the connection pin 60 through the gap between the insulating wrapping head 10 and the insulating fixing structure 70, thereby avoiding the problem of short circuit caused by impurities entering the connection position. Applying this plug to an electric valve improves the reliability of the product.

[0055] Among them, the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal post 50 are in interference fit. By adopting the interference fit method, the sealing between the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal post 50 is good, preventing impurities or fluid from entering the terminal post 50 through the gap between the outer peripheral surface of the insulating wrapping head 10 and the inner wall of the terminal post 50. And the connection is reliable in this way, preventing the insulating wrapping head 10 from being pulled out of the terminal post 50 due to unbalanced pressure at both ends of the insulating wrapping head 10.

[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 post 50. The limiting structure 80 defines the axial position of the insulating wrapping head 10 within the terminal post 50. Through the limiting structure 80, the connection reliability between the insulating wrapping head 10 and the terminal post 50 can be further improved, preventing the insulating wrapping head 10 from being pulled out of the terminal post 50. And by reliably defining the axial positions of the insulating wrapping head 10 and the terminal post 50, a reliable relative position between the insulating wrapping head 10 and the insulating fixing structure 70 can be ensured to clamp the annular seal 30 and seal reliably with the annular seal 30.

[0057] Specifically, the limiting structure 80 includes a limiting groove 81 and a limiting protrusion 82, wherein the limiting groove 81 is provided on one of the outer circumferential surface of the insulating wrapped head 10 and the inner wall of the terminal 50, and the limiting protrusion 82 is provided on the other of the outer circumferential surface of the insulating wrapped head 10 and the inner wall of the terminal 50, and the limiting protrusion 82 is inserted into the limiting groove 81. In this manner, the structure is simple and the assembly and disassembly are convenient.

[0058] In one embodiment, the limiting groove 81 and the limiting protrusion 82 are both annular. Or in other embodiments, the limiting groove 81 is arranged in multiple intervals, the limiting protrusion 82 is arranged in multiple intervals, and the multiple limiting protrusions 82 correspond to the multiple limiting grooves 81 one by one.

[0059] In an embodiment not shown in the figure, the insulating fixing structure 70 has an annular sealing groove 11 at one end facing the insulating wrapped head 10, and the annular sealing groove 11 is arranged around the plurality of lead structures 20, and the annular sealing member 30 is installed in the annular sealing groove 11. The annular sealing member 30 can be positioned through the annular sealing groove 11 to ensure an accurate installation position, thereby ensuring a sealing effect.

[0060] like Figure 4 As shown, the plug assembly also includes a top insulating layer 90, which is located on the end surface of the insulating fixing structure 70 away from the plug and the inner wall of the terminal 50, and the terminal pin 60 passes through the top insulating layer 90. This can protect the terminal pin 60. The top insulating layer 90 can be made of rubber or plastic. In addition, the top insulating layer 90 is sealed with the inner wall of the terminal 50 to prevent impurities from entering between the insulating fixing structure 70 and the insulating wrapping head 10 from the gap between the two.

[0061] The utility model also provides an electric valve, which includes a housing, a coil assembly and the above-mentioned plug assembly, wherein the coil assembly is located in the housing, the coil assembly is connected to the lead structure 20, one end of the housing is connected to one end of the terminal 50, and the connection method can be welding to achieve fixation and sealing. The plug assembly is connected to an external power source to power the coil assembly.

[0062] In the above solution, an annular seal 30 is provided at the top of the insulating wrapper 10 to prevent sludge and impurities from entering the connection position through the side gap; a sealing sleeve 40 is provided inside the insulating wrapper 10. The sealing sleeve 40 is in the shape of a capital "I" to prevent the sealing sleeve 40 from being extruded due to unbalanced pressure difference. The sealing sleeve 40 and the mating hole 12 inside the insulating wrapper 10 are in 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 terminal and the wiring pin after they are inserted and connected, thereby isolating the influence of solid and liquid impurities causing a short circuit. The insulating wrapper 10 and the inner hole at the bottom of the terminal post 50 are in interference fit. A limiting groove is provided in the inner hole at the bottom of the terminal post 50, and a limiting protrusion is provided outside the insulating wrapper 10 to achieve axial limiting fit and prevent the insulating wrapper 10 from falling due to unbalanced internal and external pressure.

[0063] The above are only optional embodiments of this solution and are not used to limit this solution. For those skilled in the art, this solution can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this solution shall be included within the protection scope of this solution.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of this solution, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, top, bottom, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this solution and simplifying the description. Without contrary instructions, these orientation words 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, it should not be construed as a limitation on the protection scope of this solution; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0067] For convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here will be made.

[0068] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of this solution.

Claims

1. A plug, used for inserting into a terminal post (50), wherein the terminal post (50) has a plurality of terminal pins (60) and an insulating fixing structure (70) for fixing the plurality of terminal pins (60), characterized in that: The plug comprises an insulating wrapping head (10), a plurality of lead structures (20) and an annular seal (30), wherein the insulating wrapping head (10) wraps the ends of the plurality of lead structures (20), and the annular seal (30) is arranged around the plurality of lead structures (20); wherein the ends of the plurality of lead structures (20) are used for correspondingly plugging into the plurality of terminal pins (60), and the annular seal (30) is located on a side of the insulating wrapping head (10) for inserting into the terminal post (50); when the plug is inserted into the terminal post (50), the annular seal (30) is sealed and matched 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 inserting into the terminal (50), the annular sealing groove (11) is arranged around the plurality of lead structures (20), and the annular sealing member (30) is installed in the annular sealing groove (11).

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

4. The plug according to claim 1, characterized in that: The insulating wrapped head (10) has a matching hole (12), and the end of the lead structure (20) is located in the matching hole (12). The plug also includes a sealing sleeve (40), and the sealing sleeve (40) is sleeved on the end of the lead structure (20). At least a part of the sealing sleeve (40) is located in the matching hole (12), the inner wall of the sealing sleeve (40) is sealed with the lead structure (20), and the outer wall of the sealing sleeve (40) is sealed with the inner wall of the matching hole (12).

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

6. The plug according to claim 4, characterized in that: The two ends of the sealing sleeve (40) are respectively provided with a first limiting ring (44) and a second limiting ring (45); the first limiting ring (44) is limitedly matched with the end face where the opening of one end of the matching hole (12) is located, and the second limiting ring (45) is limitedly matched with the end face where the opening of the other end of the matching hole (12) is located.

7. The plug according to claim 4, characterized in that: The matching hole (12) comprises a large hole section (121) and a small hole section (122) arranged in a stepped manner, a stop surface (123) is provided 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) comprises 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 in the large hole section (121), the small sleeve section (43) is located in the small hole section (122), and the transition ring (42) and the stop surface (123) are stop-matched.

8. The plug according to claim 7, characterized in that: The lead structure (20) comprises 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 in the large sleeve section (41), the lead body (21) passes through the small sleeve section (43), and the terminal (22) is used to be plugged into the wiring pin (60).

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

10. The plug 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 fit.

11. The plug 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), and the limiting structure (80) limits the axial position of the insulating wrapping head (10) on the terminal (50).

12. The plug assembly according to claim 11, characterized in that: The limiting structure (80) comprises a limiting groove (81) and a limiting protrusion (82); the limiting groove (81) is arranged 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 arranged 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 inserted into the limiting groove (81).

13. The plug 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 structures (20), and the annular sealing member (30) is installed in the annular sealing groove (11).

14. The plug assembly according to claim 9, characterized in that: The plug assembly also includes a top insulating layer (90), which is located on the end surface of the insulating fixing structure (70) facing away from the plug and the inner wall of the terminal (50), and the top insulating layer (90) is sealed with the inner wall of the terminal (50), and the terminal pin (60) passes through the top insulating layer (90).

15. An electric valve, characterized in that: The electric valve comprises 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, the coil assembly is connected to the lead structure (20), and one end of the housing is connected to one end of the terminal (50).

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