Wiring structure of explosion-proof electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a wiring structure of an anti-explosion electromagnetic valve, which comprises an anti-explosion shell and a wiring shell combination, the anti-explosion shell is provided with an anti-explosion cavity and a connecting hole, a coil is arranged in the anti-explosion cavity, the coil is provided with a wire group, and the connecting hole is communicated with the anti-explosion cavity. The wiring shell combination comprises a first shell and a first sealing piece, the first sealing piece is arranged in the connecting hole, the first shell is provided with a first cavity, the end, away from a cavity opening of the first cavity, of the first shell extends into the connecting hole and is connected with the anti-explosion shell, the first shell abuts against the first sealing piece, and a wire set of the coil penetrates out of the anti-explosion cavity. According to the utility model, the lead group is led out from the explosion-proof cavity and extends into the first cavity of the first shell, and the first sealing element is used for sealing the connecting hole, so that the cavity for placing the coil and the cavity for wiring are mutually independent, and the explosion-proof cavity does not need to be repeatedly disassembled and assembled during wiring.

Description

Technical Field

[0001] The present application relates to the technical field of solenoid valves, and more specifically to a wiring structure of an explosion-proof solenoid valve. Background Art

[0002] An explosion-proof solenoid valve is a solenoid valve that encloses all components that may generate sparks and arcs in an explosion-proof casing.

[0003] There is an explosion-proof solenoid valve, such as Figure 1 As shown, it includes a shell 90, a coil 91, a terminal 92 and a threaded joint 93. The shell 90 has an explosion-proof cavity 901 and a connecting part 902. The connecting part 902 has a stepped hole 9021. The stepped hole 9021 is connected to the explosion-proof cavity 901. The end of the stepped hole away from the explosion-proof cavity 901 has an internal thread. The coil 91 and the terminal 92 are both arranged in the explosion-proof cavity 901. The neutral wire, live wire and ground wire are led out from one end of the coil 91. It should be noted that the shell 90 is closed under normal circumstances. When connecting to the external power line, the wiring personnel need to open the shell 90 and pass the neutral wire, live wire and ground wire of the external power line 94 through the threaded joint 93 and the stepped hole 9021 in turn, and then electrically connect them with the neutral wire, live wire and ground wire led out of the coil 91 through the terminal 92, and then close the shell. However, because the chamber for placing the coil 91 and the chamber for wiring share the same chamber, the explosion-proof chamber 901, which has been previously sealed for explosion-proofing, needs to be opened during wiring, which may affect the explosion-proof performance. In addition, both ends of the threaded joint 93 have external threads. When protecting the external power cord in the prior art, one end of the threaded joint 93 is inserted into the stepped hole 9021 and threadedly connected to the stepped hole 9021, and the other end of the threaded joint 93 is threadedly connected to an external protective tube (not shown in the figure). The protective tube provides protection for the power cord 94. However, because the protective tube and the power cord 94 are connected to each other through the threaded joint 93, when the protective tube is subjected to force for a long time and the force is transmitted to the threaded joint 93, the threaded joint 93 and the stepped hole 9021 are worn, and the threaded joint 93 swings when subjected to force. This swinging will also cause the power cord 94 to swing accordingly, posing a risk of damaging the power cord 94.

[0004] Therefore, there is a need to provide a wiring structure for an explosion-proof solenoid valve in which a chamber for placing a coil and a chamber for wiring are independent of each other, and a power line and a protective tube are independent of each other. Summary of the Invention

[0005] The main purpose of the present application is to provide a wiring structure of an explosion-proof solenoid valve, wherein the wiring structure of the explosion-proof solenoid valve includes an explosion-proof shell and a wiring shell combination, the explosion-proof shell has an explosion-proof cavity with a coil therein and a connecting hole, the coil has a wire group, the connecting hole is connected to the explosion-proof cavity, the wiring shell combination includes a first shell and a first sealing member, the first sealing member is placed in the connecting hole, the first shell has a first chamber, the end of the first shell away from the cavity opening of the first chamber extends into the connecting hole and is connected to the explosion-proof shell, and the first shell abuts against the first sealing member, and the wire group of the coil passes through the explosion-proof cavity and extends into the first cavity after passing through the first sealing member. By leading the wire group out of the explosion-proof cavity and extending into the first cavity of the first shell, and sealing the connecting hole with the first sealing member, the chamber for placing the coil and the chamber for wiring are independent of each other, and the explosion-proof cavity does not need to be repeatedly disassembled and assembled during wiring.

[0006] Another object of the present application is to provide a wiring structure for an explosion-proof solenoid valve, wherein the cavity contour of the explosion-proof cavity is spaced a predetermined distance from or fits the outer contour of the coil, and the wiring shell assembly is suitable for a variety of explosion-proof housings and facilitates wiring.

[0007] Another object of the present application is to provide a wiring structure for an explosion-proof solenoid valve, wherein the wiring shell combination also includes a second shell, the second shell has a second chamber, the end of the first shell having the first chamber opening and the end of the second shell having the second chamber opening are detachably connected, and the first chamber is communicated with the second chamber, the end of the second shell facing away from the first shell has an external thread, and the end of the second chamber facing away from the first chamber has an internal thread, the wiring shell combination also includes a sealing bolt, the sealing bolt is threadedly connected to the internal thread, the sealing bolt has a penetrating center hole, the external power cord passes through the center hole and extends into the second chamber and is electrically connected to the wire group, by making the power cord and the protective tube independent of each other, damage to the power cord when the connection between the protective tube and the external thread is loosened is avoided.

[0008] In order to achieve at least one of the above-mentioned invention objectives, the present application provides a wiring structure of an explosion-proof solenoid valve, wherein the wiring structure of the explosion-proof solenoid valve comprises:

[0009] an explosion-proof housing having an explosion-proof cavity with a coil therein and a connecting hole, the coil having a wire group, and the connecting hole communicating with the explosion-proof cavity; and

[0010] A wiring shell assembly, the wiring shell assembly includes a first shell and a first seal, the first seal is placed in the connecting hole, the first shell has a first chamber, the first shell has an end away from the first chamber opening and extends into the connecting hole and is connected to the explosion-proof shell, and the first shell is against the first seal, and the wire group of the coil passes through the explosion-proof cavity and extends into the first chamber after passing through the first seal.

[0011] In one or more embodiments of the present application, a cavity outline of the explosion-proof cavity is spaced a predetermined distance from an outer outline of the coil.

[0012] In one or more embodiments of the present application, the cavity contour of the explosion-proof cavity fits the outer contour of the coil.

[0013] In one or more embodiments of the present application, the wiring shell combination also includes a second shell, the second shell has a second chamber, one end of the first shell having the first chamber opening and the end of the second shell having the second chamber opening are detachably connected, and the first chamber is connected to the second chamber.

[0014] In one or more embodiments of the present application, the second shell has an external thread at one end facing away from the first shell, and the second chamber has an internal thread at one end facing away from the first chamber. The wiring shell assembly also includes a sealing bolt, which is threadedly connected to the internal thread. The sealing bolt has a central hole extending therethrough, and the external power cord passes through the central hole and extends into the second chamber and is electrically connected to the wire group.

[0015] In one or more embodiments of the present application, the first chamber and the second chamber each include an expansion portion and a connecting portion. When the first shell is connected to the second shell, the two expansion portions are connected to each other.

[0016] In one or more embodiments of the present application, the wiring shell assembly further includes a second seal, which is disposed in the connecting portion of the second shell. When the sealing bolt is connected to the internal thread, the sealing bolt abuts against the second seal.

[0017] In one or more embodiments of the present application, the wiring structure of the explosion-proof solenoid valve also includes a terminal, which is placed at the connection point between the first chamber and the second chamber, and the neutral wire and the live wire in the wire group are electrically connected to the neutral wire and the live wire of the external power line through the terminal.

[0018] In one or more embodiments of the present application, the wiring structure of the explosion-proof solenoid valve also includes a support plate, which is placed in the first chamber, and the two ends of the support plate are bolted to the first shell, and the support plate is fixedly connected to the terminal.

[0019] In one or more embodiments of the present application, the maximum radial dimension of the first chamber is equal to the radial dimension of the end of the second shell near the cavity opening of the second chamber, the end of the second shell near the cavity opening of the second chamber extends into the second chamber, and the end of the second shell near the first shell has an annular groove, and a sealing ring is sleeved in the annular groove.

[0020] In an embodiment of the present application, the wiring structure of the explosion-proof solenoid valve includes an explosion-proof shell and a wiring shell combination, the explosion-proof shell has an explosion-proof cavity with a coil therein and a connecting hole, the coil has a wire group, the connecting hole is connected to the explosion-proof cavity, the wiring shell combination includes a first shell and a first seal, the first seal is placed in the connecting hole, the first shell has a first chamber, the end of the first shell away from the cavity opening of the first chamber extends into the connecting hole and is connected to the explosion-proof shell, and the first shell is against the first seal, and the wire group of the coil passes through the explosion-proof cavity and extends into the first chamber after passing through the first seal. By leading the wire group out of the explosion-proof cavity and extending into the first chamber of the first shell, and sealing the connecting hole with the first seal, the chamber for placing the coil and the chamber for wiring are independent of each other, and there is an advantage of not having to repeatedly disassemble and assemble the explosion-proof cavity during wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] These and / or other aspects and advantages of the present application will become more clear and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0022] Figure 1 The figure shows a structural diagram of an existing explosion-proof solenoid valve;

[0023] Figure 2 The figure shows a schematic structural diagram of a wiring structure of an explosion-proof solenoid valve according to the first embodiment of the present utility model;

[0024] Figure 3 The figure shows a schematic structural diagram of the junction housing assembly;

[0025] Figure 4 The figure shows a schematic diagram of the structure of the terminal;

[0026] Figure 5 The figure shows a schematic structural diagram of a wiring structure of an explosion-proof solenoid valve according to the second embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The terms and words used in the following description and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] Although ordinal numbers such as "first," "second," and the like will be used to describe various components, these are not intended to limit those components. The terms are used solely to distinguish one component from another. For example, a first component could be referred to as a second component, and similarly, a second component could be referred to as a first component without departing from the teachings of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] The terms used herein are for the purpose of describing various embodiments only and are not intended to be limiting. As used herein, the singular is intended to include the plural, unless the context clearly indicates otherwise. It will also be understood that the terms "comprising" and / or "having" when used in this specification specify the presence of a stated feature, number, step, operation, component, element, or combination thereof, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

[0031] Schematic diagram of the wiring structure of the explosion-proof solenoid valve, refer to Figures 2 to 5 According to any preferred embodiment of the present invention, a wiring structure of an explosion-proof solenoid valve includes an explosion-proof housing 10 and a wiring shell assembly 20.

[0032] Specifically, in any embodiment of this application, refer to Figure 2 The explosion-proof housing 10 has an explosion-proof cavity 102 in which a coil 101 is provided and a connecting hole 103. The coil 101 has a wire group 1011. The connecting hole 103 is connected to the explosion-proof cavity 102. In addition, Figure 2 and Figure 3As shown, the wiring shell assembly 20 includes a first shell 201 and a first seal 202. The first seal 202 is placed in the connecting hole 103. The first shell 201 has a first chamber 2011. One end of the first shell 201 away from the opening of the first chamber 2011 extends into the connecting hole 103 and is connected to the explosion-proof housing 10. The first shell 201 is against the first seal 202, and the wire group 1011 of the coil 101 passes through the explosion-proof chamber 102 and extends into the first chamber 2011 after passing through the first seal 202.

[0033] It should be noted that, in the first embodiment of the present application, Figure 2 As shown, the cavity contour of the explosion-proof cavity 102 is spaced a predetermined distance from the outer contour of the coil 101, that is, the explosion-proof housing 10 includes a box body with an opening and a sealing cover for closing the opening, and the sealing cover is connected to the box body by screws or the like. The cavity contour of the explosion-proof cavity 102 of the box body is larger than the outer contour size of the coil 101. In the first embodiment, when the coil 101 is placed in the explosion-proof cavity 102 and the first shell 201 is connected to the explosion-proof housing 10, the explosion-proof cavity 102 is normally kept closed by the sealing cover, and the wire group 1011 is led out from the explosion-proof cavity 102 alone. Therefore, when connecting the wire group 1011 to the external power line 30, there is no need to open the explosion-proof cavity 102 containing the coil 101 again as in the prior art, that is, the sealing cover is separated from the box body, thereby achieving the independence of the chamber for placing the coil 101 and the chamber for wiring, thereby avoiding damage that may be caused by repeated disassembly and assembly of the explosion-proof cavity 102.

[0034] It should also be noted that, in the second embodiment of the present application, Figure 5 As shown, the cavity contour of the explosion-proof cavity 102 fits the outer contour of the coil 101. In the second embodiment, the explosion-proof housing 10 is made of epoxy resin. Therefore, except for the lead-out wire group 1011 and the connection hole 103, the coil 101 is completely sealed by the epoxy resin. It should be pointed out that in the prior art, this type of cast-in-place explosion-proof housing requires the purchase of an additional junction box, and then the cast-in-place explosion-proof housing is connected to the external junction box through a dedicated conversion threaded joint. The connection is relatively cumbersome. In the embodiment of the present application, the first shell 201 can be directly threadedly connected to the explosion-proof housing 10 without the aid of a conversion threaded joint. Compared with the prior art, it also has the advantage of more convenient connection.

[0035] Furthermore, in any embodiment of the present invention, in order to achieve protection after the wire group 1011 is connected to the external power line 30, as shown in FIG. Figure 2 and Figure 3 As shown, the wiring shell assembly 20 also includes a second shell 203, the second shell 203 has a second chamber 2031, and the end of the first shell 201 having the opening of the first chamber 2011 and the end of the second shell 203 having the opening of the second chamber 2031 are detachably connected, and the detachable connection is further implemented as a bolt connection, and the first chamber 2011 is connected to the second chamber 2031.

[0036] It should be noted that before connecting the external power cord 30 to the wire group 1011, the first shell 201 and the second shell 203 are separated, and the wire group 1011 is exposed to the outside to facilitate connection with the external power cord 30; after the external power cord 30 is connected to the wire group 1011, the first shell 201 and the second shell 203 are bolted together, and the first chamber 2011 is closed to achieve protection for the wire group 1011 after being connected to the external power cord 30.

[0037] It should also be noted that the external power cord 30 needs to pass through the second shell 203 and enter the second chamber 2031, and the sealing between the external power cord 30 and the second shell 203 must be ensured; in addition, in order to protect the external power cord 30, in the prior art, a protective tube (not shown in the figure) needs to be installed outside the external power cord 30. In view of this, in any embodiment of the present utility model, if Figure 2 and Figure 3 As shown, the second shell 203 has an external thread 2032 at one end facing away from the first shell 201, and the second chamber 2031 has an internal thread 2033 at one end facing away from the first chamber 2011. The wiring shell assembly 20 also includes a sealing bolt 204, which is threadedly connected to the internal thread 2033. The sealing bolt 204 has a central hole (not marked in the figure) extending therethrough, and the external power cord 30 extends through the central hole into the second chamber 2031 and is electrically connected to the wire group 1011.

[0038] In addition, in any embodiment of the present invention, if Figure 2 and Figure 3 As shown, the first chamber 2011 and the second chamber 2031 each include an expansion portion 2031A and a communication portion 2031B. When the first shell 201 and the second shell 203 are connected, the two expansion portions 2031A are communicated with each other.

[0039] In addition, in any embodiment of the present invention, if Figure 2 and Figure 3As shown, the wiring shell assembly 20 further includes a second sealing member 204 , which is disposed in the connecting portion 2031B of the second shell 203 . When the sealing bolt 204 is connected to the internal thread 2033 , the sealing bolt 204 abuts against the second sealing member 204 .

[0040] It should be noted that the second sealing member 204 is a sealing ring, and the sealing bolt 204 is pressed against the second sealing member 204, and the side wall of the second sealing member 204 is fitted with the connecting portion 2031B on the second shell 203, and the external power line 30 is passed through the second sealing member 204, thereby achieving a seal at the point where the external power line 30 and the second shell 203 are inserted; in addition, by providing the external thread 2032 on the shell of the second shell 203, a prerequisite is provided for the threaded connection between the external protection tube and the external thread 2032; in addition, since the external protection tube is connected to the The second shell 203 is threadedly connected, and the external power cord 30 is passed through the sealing bolt 204, and the sealing bolt 204 is threadedly connected to the second shell 203. The external power cord 30 and the external protective tube are independent of each other. Even if the connection between the external power cord 30 and the external thread 2032 is loosened after long-term stress, since the sealing bolt 204 is sleeved on the outside of the external power cord 30, the end of the external power cord 30 close to the second shell 203 will be protected. Compared with the prior art where the loosening of the protective tube will cause the power cord 30 to swing, the present application has the advantage that the power cord and the protective tube are independent of each other.

[0041] Furthermore, in order to facilitate the connection between the wire group 1011 and the external power line 30, in any embodiment of the present utility model, as shown in FIG. Figure 2 and Figure 3 As shown, the wiring structure of the explosion-proof solenoid valve also includes a terminal 40, which is placed at the connection point between the first chamber 2011 and the second chamber 2031. The neutral wire and the live wire in the wire group 1011 are electrically connected to the neutral wire and the live wire of the external power line 30 through the terminal 40.

[0042] It should be noted that the material of the terminal 40 is ceramic, such as Figure 3 and Figure 4As shown, the two side walls of the terminal 40 each have two lead holes 401, and the top surface of the terminal 40 has four bolt holes 402. The bolt holes 402 are internally threaded with wire-pressing bolts. When wiring, the neutral wire and live wire in the wire group 1011 are respectively passed through the two lead holes 401 on one side of the terminal 40. The wire-pressing bolts in the corresponding bolt holes 402 are then tightened to press the corresponding neutral wire or live wire. Similarly, the neutral wire and live wire in the external power supply line 30 are respectively passed through the two lead holes 401 on the other side of the terminal 40 and contact the neutral wire and live wire in the wire group 1011. The wire-pressing bolts in the corresponding bolt holes 402 are then tightened to achieve the circuit connection between the external power supply line 30 and the wire group 1011. It should also be noted that the provision of the expansion portion 2031A provides space for placing the terminal 40.

[0043] Furthermore, in order to support the terminal 40, in any embodiment of the present invention, as Figure 2 and Figure 3 As shown, the wiring structure of the explosion-proof solenoid valve further includes a support plate 50, which is positioned within the first chamber 2011 and bolted to the first housing 201 at both ends. The support plate 50 is also fixedly connected to the terminal 40. It should also be noted that the ground wire in the wire assembly 1011 and the ground wire in the external power supply cable 30 are respectively connected to the bolts at both ends of the support plate 50.

[0044] Specifically, in order to achieve a fixed connection between the support plate 50 and the terminal 40, in any embodiment of the present utility model, the terminal 40 has a protrusion (not marked in the figure) on the side facing away from the bolt hole 402, and the support plate 50 has a snap-in hole (not marked in the figure), and the protrusion is snapped into the snap-in hole.

[0045] Furthermore, in order to improve the sealing performance of the connection between the first shell 201 and the second shell 203, in any embodiment of the present invention, Figure 2 and Figure 3 As shown, the maximum radial dimension of the first chamber 2011 is equal to the radial dimension of the end of the second shell 203 close to the cavity opening of the second chamber 2031, and the end of the second shell 203 close to the cavity opening of the second chamber 2031 extends into the second chamber 2031. The end of the second shell 203 close to the first shell 201 has an annular groove 2034, and a sealing ring (not marked in the figure) is sleeved in the annular groove 2034.

[0046] In summary, the wiring structure of the explosion-proof solenoid valve based on the embodiment of the present application is explained, which provides the wiring structure of the explosion-proof solenoid valve with advantages such as the chamber for placing the coil and the chamber for wiring are independent of each other, and the power cord and the protective tube are independent of each other.

[0047] It is worth mentioning that in the embodiments of the present application, the wiring structure of the explosion-proof solenoid valve is simple in structure, does not involve complex manufacturing processes and expensive materials, and is highly economical. At the same time, for manufacturers, the wiring structure of the explosion-proof solenoid valve provided in the present application is easy to produce and low in cost, which is more conducive to controlling production costs and further promoting product promotion and use.

[0048] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are provided for illustrative purposes only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from these principles.

Claims

1. A wiring structure for an explosion-proof solenoid valve, characterized in that: The wiring structure of the explosion-proof solenoid valve includes An explosion-proof housing having an explosion-proof cavity with a coil therein and a connecting hole, the coil having a wire group, and the connecting hole communicating with the explosion-proof cavity; as well as A wiring shell assembly, the wiring shell assembly includes a first shell and a first seal, the first seal is placed in the connecting hole, the first shell has a first chamber, the first shell has an end away from the first chamber opening and extends into the connecting hole and is connected to the explosion-proof shell, and the first shell is against the first seal, and the wire group of the coil passes through the explosion-proof cavity and extends into the first chamber after passing through the first seal.

2. The wiring structure of the explosion-proof solenoid valve according to claim 1, characterized in that: The cavity outline of the explosion-proof cavity is spaced a predetermined distance from the outer outline of the coil.

3. The wiring structure of the explosion-proof solenoid valve according to claim 1, characterized in that: The cavity contour of the explosion-proof cavity fits the outer contour of the coil.

4. The wiring structure of the explosion-proof solenoid valve according to claim 2 or 3, characterized in that: The wiring shell assembly also includes a second shell having a second chamber. One end of the first shell having the first chamber opening is detachably connected to one end of the second shell having the second chamber opening, and the first chamber is connected to the second chamber.

5. The wiring structure of the explosion-proof solenoid valve according to claim 4, characterized in that: The second shell has an external thread at one end facing away from the first shell, and the second chamber has an internal thread at one end facing away from the first chamber. The wiring shell assembly also includes a sealing bolt, which is threadedly connected to the internal thread. The sealing bolt has a central hole extending therethrough, and the external power cord passes through the central hole and extends into the second chamber and is electrically connected to the wire group.

6. The wiring structure of the explosion-proof solenoid valve according to claim 5, characterized in that: The first chamber and the second chamber each include an expansion portion and a communication portion. When the first shell is connected to the second shell, the two expansion portions are communicated with each other.

7. The wiring structure of the explosion-proof solenoid valve according to claim 6, characterized in that: The wiring shell assembly further includes a second sealing member, which is disposed in the communicating portion of the second shell. When the sealing bolt is connected to the internal thread, the sealing bolt abuts against the second sealing member.

8. The wiring structure of the explosion-proof solenoid valve according to claim 7, characterized in that: The wiring structure of the explosion-proof solenoid valve also includes a terminal, which is placed at the connection point between the first chamber and the second chamber. The neutral wire and the live wire in the wire group are electrically connected to the neutral wire and the live wire of the external power line through the terminal.

9. The wiring structure of the explosion-proof solenoid valve according to claim 8, characterized in that: The wiring structure of the explosion-proof solenoid valve further includes a support plate, which is placed in the first chamber, and both ends of the support plate are bolted to the first shell, and the support plate is fixedly connected to the terminal.

10. The wiring structure of the explosion-proof solenoid valve according to claim 9, characterized in that: The maximum radial dimension of the first chamber is equal to the radial dimension of the end of the second shell near the cavity opening of the second chamber, the end of the second shell near the cavity opening of the second chamber extends into the second chamber, and the end of the second shell near the first shell has an annular groove, and a sealing ring is sleeved in the annular groove.

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