Explosion-proof electromagnetic valve

Abstract

The utility model discloses an explosion -proof electromagnetic valve, including valve body, coil structure and the explosion -proof shell of surrounding sleeve in the outside of coil structure, and coil structure is fixed in valve body through connecting assembly, and is connected with explosion -proof shell through fixing piece, and the bottom of explosion -proof shell is the open portion of matching sleeve joint on connecting assembly, and the explosion -proof top cover of covering fixing piece is equipped in the mounting groove of explosion -proof shell top, and the first explosion -proof surface is formed between explosion -proof top cover and mounting groove, and the open portion of explosion -proof shell and valve body connecting assembly contact formation second explosion -proof surface. Through explosion -proof shell, coil structure is completely encapsulated and forms the closed explosion -proof space with coil structure as the center, and the multiple explosion -proof surface formed in combination with the top and bottom of explosion -proof shell constitutes the complete spark propagation path of preventing fire, eliminates the possibility of spark and the contact of external combustible medium, meets the explosion -proof standard, is applicable to high -risk working environment, and reduces the risk of safety accident.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, specifically to an explosion-proof electromagnetic valve. Background Technology

[0002] A solenoid valve is an industrial actuator that uses electromagnetic control as its core. Belonging to the category of actuators, it is widely used in industrial control systems to achieve precise fluid control. The working principle of a solenoid valve is based on an electric current driving an electromagnetic coil, causing the valve to open and close. However, during this process, the electromagnetic coil is highly susceptible to generating electric sparks at the instant of energization and de-energization due to electromagnetic induction and transient changes in the circuit. In flammable and explosive environments containing combustible gases, vapors, or dust, these electric sparks, upon contact with the flammable medium, can trigger an explosion, posing a serious threat to production facilities, personnel safety, and even the entire production process.

[0003] In conventional industrial environments, ordinary solenoid valves can meet basic control requirements. However, in hazardous conditions with strict explosion-proof requirements, such as underground coal mines and flammable and explosive petrochemical areas, they lack effective explosion-proof designs and cannot prevent electrical sparks from contacting external flammable media, making it difficult to meet explosion-proof safety standards. Therefore, to address the safety hazards caused by electrical sparks in flammable and explosive environments, and the deficiencies in the explosion-proof performance of existing explosion-proof solenoid valves, there is an urgent need to develop a structurally sound, reliable explosion-proof solenoid valve that meets stringent explosion-proof standards. This would ensure the safe and stable operation of industrial control systems under hazardous conditions and promote the further development of industrial automation in the field of explosion protection. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the safety hazards caused by electric sparks in flammable and explosive environments, and the difficulty in meeting explosion-proof safety standards of existing solenoid valves, thereby providing an explosion-proof solenoid valve with reliable explosion-proof performance that can meet stringent explosion-proof standards.

[0005] To solve the above-mentioned technical problems, this utility model provides an explosion-proof solenoid valve, including a valve body, a coil structure, and an explosion-proof housing. The valve body is provided with a connecting assembly for connecting the coil structure. The explosion-proof housing surrounds and is fitted around the outside of the coil structure and connected to the valve body. The top of the explosion-proof housing is connected to the coil structure by a fastener. The bottom of the explosion-proof housing is an opening that fits into the connecting assembly. The top of the explosion-proof housing is provided with a mounting groove. A connecting hole for connecting the fastener is provided through the mounting groove, and an explosion-proof top cover fitted into the mounting groove and covering the fastener is provided. The explosion-proof top cover and the mounting groove form a first explosion-proof surface with circumferential connection. The inner wall of the opening is in close contact with the connecting assembly to form a second explosion-proof surface with circumferential connection.

[0006] As a preferred embodiment, the connection assembly includes a connection seat disposed at the bottom of the coil structure and a connection cover sleeved on the connection seat. The connection seat is fixed to the valve body, and the opening of the explosion-proof housing is fitted onto the connection cover. The second explosion-proof surface is formed between the explosion-proof housing and the connection cover and between the connection seat and the connection cover, respectively.

[0007] As a preferred embodiment, a first sealing ring is provided between the explosion-proof top cover and the inner wall of the mounting groove, a second sealing ring is provided between the explosion-proof outer shell and the connecting cover, and a third sealing ring is provided between the connecting seat and the connecting cover.

[0008] As a preferred embodiment, the coil structure includes an electromagnetic coil and a conduit disposed within the inner cavity of the electromagnetic coil, as well as a stationary iron core and a moving iron core disposed within the conduit. It also includes a coil sleeve fitted around the outside of the electromagnetic coil. The upper end of the coil sleeve is tightly fitted with a limiting seat, and its lower end is fixedly connected to the connecting cover by welding. The stationary iron core is welded to the upper end of the conduit, and the lower end of the conduit is fixedly connected to the connecting seat by welding. The moving iron core passes through the connecting seat and is connected to the valve stem inside the valve body.

[0009] As a preferred embodiment, the explosion-proof housing has a positioning groove on the top inner side that is spaced apart from the mounting groove. A top partition is provided between the positioning groove and the mounting groove. The top partition has a connecting hole that connects the positioning groove and the mounting groove. The stationary iron core has a positioning protrusion that is positioned and connected in the positioning groove. The fixing member passes through the connecting hole and is fixedly connected to the positioning protrusion.

[0010] As a preferred embodiment, the explosion-proof enclosure has an installation window on its side, and a circuit board connected to an electromagnetic coil is fixedly installed inside the installation window. A junction box cover is installed in the installation window to surround the circuit board, and a third explosion-proof surface is formed by connecting the junction box cover and the explosion-proof enclosure around the installation window.

[0011] As a preferred embodiment, the explosion-proof enclosure includes an enclosure portion surrounding the mounting window and a mounting step formed within the enclosure portion. The circuit board is fixed to the mounting step by screws. The junction box cover has a mating part that is inserted into the enclosure portion. The mating part is in close contact with the inner wall of the enclosure portion to form a third explosion-proof surface, and a fourth sealing ring is provided between the mating part and the inner wall of the enclosure portion.

[0012] As a preferred embodiment, the junction box cover is provided with an explosion-proof stuffing gland at the wiring port, which allows wires to pass through in a sealed manner. The explosion-proof stuffing gland is fastened to the wiring port of the junction box cover by a threaded structure, and a threaded explosion-proof joint surface is formed between the explosion-proof stuffing gland and the wiring port.

[0013] As a preferred embodiment, the engagement length of the threaded explosion-proof mating surface is ≥8mm.

[0014] As a preferred embodiment, the connection length of the first explosion-proof surface, the second explosion-proof surface, and the third explosion-proof surface is ≥6mm.

[0015] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the explosion-proof solenoid valve provided by this utility model, the top of the explosion-proof housing is fixedly connected to the coil structure by a fixing member. The explosion-proof top cover is fitted into the mounting groove on the top of the explosion-proof housing, and a first explosion-proof surface with circumferential connection is formed between the two, covering the mounting area of ​​the fixing member. This blocks the path that internal electric sparks may leak outward through the connection gap of the fixing member. The fitted explosion-proof top cover ensures the airtightness of the top area of ​​the explosion-proof housing. The bottom opening of the explosion-proof housing is matched and sleeved on the connecting component at the bottom of the coil structure, and a second explosion-proof surface with circumferential connection is formed by close contact. This matching sleeve-fitting explosion-proof surface structure can resist displacement caused by vibration and prevent electric sparks from leaking from the joint between the bottom of the explosion-proof housing and the valve body. This technical solution completely encapsulates the coil structure with an explosion-proof housing, forming a closed explosion-proof space centered on the coil structure. Combined with the explosion-proof surfaces formed at the top and bottom of the housing, multiple explosion-proof surfaces create a complete anti-spark propagation path, eliminating the possibility of sparks coming into contact with external flammable media. This comprehensively protects the coil structure, prevents spark leakage, meets explosion-proof standards, is suitable for high-risk working environments, extends the service life of the solenoid valve, and reduces the risk of safety accidents.

[0016] 2. In the explosion-proof solenoid valve provided by this utility model, the connecting assembly consists of a connecting seat and a connecting cover set on the top of the valve body. The connecting seat, the connecting cover and the explosion-proof shell adopt a layered fitting structure, which can disperse the stress generated by equipment vibration and other working conditions, and ensure that the explosion-proof surface is tightly fitted for a long time. This design forms a second explosion-proof surface between the explosion-proof shell and the connecting cover and between the connecting seat and the connecting cover, thereby constructing a double circumferential explosion-proof barrier between the explosion-proof shell and the valve body, which greatly improves the explosion-proof reliability. This layered explosion-proof surface can further reduce the possibility of electric spark leakage in a limited space, strengthen the explosion-proof effect and extend the service life of the product.

[0017] 3. In the explosion-proof solenoid valve provided by this utility model, based on the connection of the first explosion-proof surface at the top of the explosion-proof housing, the elastic deformation of the first sealing ring effectively fills the tiny gap between the explosion-proof top cover and the inner wall of the mounting groove, completely blocking the leakage of electric sparks through the gap, thus forming a double protection of the explosion-proof surface and the sealing surface at the top of the explosion-proof housing; in addition, based on the connection of the second explosion-proof surface at the bottom of the explosion-proof housing, the second sealing ring seals and fills the fitting gap between the explosion-proof housing and the connecting cover, and the third O-ring seals and fills the fitting gap between the internal connecting seat of the valve body and the connecting cover, thereby strengthening the sealing performance and forming a double protection of the explosion-proof surface and the sealing surface at the bottom of the explosion-proof housing.

[0018] 4. In the explosion-proof solenoid valve provided by this utility model, an installation window is opened on the side of the explosion-proof housing for mounting the circuit board, and a junction box cover surrounding the circuit board is installed at the installation window position. The explosion-proof housing and the junction box cover are connected to form a third explosion-proof surface, thereby forming a sealed explosion-proof barrier on the side of the explosion-proof housing. This completely blocks the contact between the electrical sparks in the circuit board area and the external flammable medium. Together with the explosion-proof surfaces at the top and bottom of the explosion-proof housing, it forms an all-round three-dimensional explosion-proof system, eliminating the defect of ordinary solenoid valves that have no effective explosion-proof on the side, and meeting the all-dimensional explosion-proof requirements under high-risk working conditions.

[0019] 5. In the explosion-proof solenoid valve provided by this utility model, the explosion-proof shell adopts the design of the enclosure and the mounting step to provide an embedded mounting reference for the junction box cover joint, ensuring high fitting accuracy and controllable gap between the joint and the side wall of the mounting step. It can be seen that the third explosion-proof surface is achieved by the precise fit between the enclosure of the explosion-proof shell and the junction box cover joint, avoiding the explosion-proof surface from increasing gap or misalignment due to vibration, ensuring the long-term stability of explosion-proof performance. The third explosion-proof surface provides a dedicated, high-precision explosion-proof barrier for the wiring link, making it safe and reliable to use. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a cross-sectional structural diagram of the explosion-proof solenoid valve of this utility model. Figure 2 for Figure 1 A partially enlarged schematic diagram of the explosion-proof solenoid valve shown. Figure 3 This is a schematic diagram of the installation structure of the explosion-proof top cover of the utility model; Figure 4 This is a schematic diagram of the connection structure of the connecting cover of the utility model; Figure 5 This is a schematic diagram of the connection structure of the connector of the utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Coil structure; 20. Connecting assembly; 201. Connecting seat; 202. Connecting cover; 21. Electromagnetic coil; 22. Stationary iron core; 23. Moving iron core; 24. Coil sleeve; 25. Positioning protrusion; 26. Guide tube; 27. Limiting seat; 3. Explosion-proof housing; 31. Explosion-proof top cover; 32. Opening; 33. Fixing component; 34. Mounting groove; 35. Positioning groove; 41. First sealing ring; 42. Second sealing ring; 43. Third sealing ring; 44. Fourth sealing ring; 51. First explosion-proof surface; 52. Second explosion-proof surface; 53. Third explosion-proof surface; 6. Mounting window; 61. Enclosure; 7. Circuit board; 71. Screw; 8. Junction box cover; 81. Joint; 9. Explosion-proof stuffing box; 91. Threaded explosion-proof joint surface. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides, as follows: Figure 1-5An explosion-proof solenoid valve is shown, comprising a valve body 1, a coil structure 2, and an explosion-proof housing 3. The coil structure includes a connecting assembly 20 fixed to the valve body. The explosion-proof housing 3 surrounds and is fitted around the outside of the coil structure 2. The top of the explosion-proof housing 3 is connected to the coil structure via a fastener 33. The bottom of the explosion-proof housing 3 is an opening 32 that fits into the connecting assembly 20. The top of the explosion-proof housing 3 is provided with a mounting groove 34. A connecting hole for connecting the fastener 33 is provided through the mounting groove 34, and an explosion-proof top cover 31 is fitted into the mounting groove 34 and covers a fastener. The explosion-proof top cover 31 and the mounting groove 34 form a first explosion-proof surface 51 that is circumferentially connected. The inner wall of the opening 32 is in close contact with the connecting assembly 20 to form a second explosion-proof surface 52 that is circumferentially connected.

[0027] In the above embodiments, the top of the explosion-proof housing 3 is fixedly connected to the coil structure by the fastener 33. The explosion-proof top cover 31 is fitted into the mounting groove 34 on the top of the explosion-proof housing 3, and a first explosion-proof surface 51 with circumferential connection is formed between the two, covering the mounting area of ​​the fastener 33 and blocking the path of possible leakage of internal electric sparks through the connection gap of the fastener 33. The fitted explosion-proof top cover 31 ensures the airtightness of the top area of ​​the explosion-proof housing 3. The opening 32 at the bottom of the explosion-proof housing 3 is matched and sleeved on the connecting assembly 20 of the valve body 1, and a second explosion-proof surface 52 with circumferential connection is formed by close contact. This matching sleeve explosion-proof surface structure can resist displacement caused by vibration and prevent electric sparks from leaking from the joint between the bottom of the explosion-proof housing 3 and the valve body 1. This technical solution completely encapsulates the coil structure 2 with an explosion-proof housing 3, forming a closed explosion-proof space centered on the coil structure. Combined with the explosion-proof surfaces formed at the top and bottom of the explosion-proof housing 3, multiple explosion-proof surfaces constitute a complete anti-spark propagation path, eliminating the possibility of sparks coming into contact with external flammable media, comprehensively protecting the coil structure, preventing spark leakage, meeting explosion-proof standards, suitable for high-risk working environments, extending the service life of the solenoid valve, and reducing the risk of safety accidents.

[0028] The following is combined Figure 2-5 The specific arrangement of the coil structure and the explosion-proof enclosure is described in detail below: The connecting assembly 20 includes a connecting seat 201 disposed at the bottom of the coil structure and a connecting cover 202 sleeved on the connecting seat 201. The coil structure is fixedly connected to the valve body via the connecting seat, and the connecting seat and the valve body are fixed together by bolts. More preferably, the coil structure 2 includes an electromagnetic coil 21 and a conduit 26 disposed within the inner cavity of the electromagnetic coil 21, as well as a stationary iron core 22 and a moving iron core 23 disposed within the conduit. It also includes a coil sleeve 24 sleeved outside the electromagnetic coil 21. The coil sleeve 24 provides insulation and protection between the electromagnetic coil 21 and the explosion-proof housing 3. The upper end of the coil sleeve 24 is tightly fitted with a limiting seat 27, and its lower end is fixedly connected to the connecting cover 202 by welding. The stationary iron core 22 is welded to the upper end of the conduit 26, and the lower end of the conduit 26 is fixedly connected to the connecting seat 201 by welding. The welding connections between the connecting seat and the conduit, and between the connecting cover and the coil sleeve, provide excellent sealing and structural strength. The moving iron core 23 passes through the connecting seat 201 and connects to the valve stem inside the valve body 1. The reciprocating movement of the moving iron core drives the valve core to move, thereby opening or closing the valve. The opening 32 of the explosion-proof housing 3 is fitted onto the connecting cover 202. The second explosion-proof surface 52 is formed between the explosion-proof housing 3 and the connecting cover 202 and between the connecting seat 201 and the connecting cover 202. This structure, with the connecting seat 201, the connecting cover 202, and the explosion-proof housing 3 using a layered fitting structure, can disperse the stress generated by equipment vibration and other operating conditions, ensuring that the explosion-proof surfaces are tightly fitted for a long time. This design forms a second explosion-proof surface 52 between the explosion-proof housing 3 and the connecting cover 202 and between the connecting seat 201 and the connecting cover 202, respectively, thereby constructing a double circumferential explosion-proof barrier between the explosion-proof housing and the valve body, greatly improving the explosion-proof reliability. This layered explosion-proof surface can further reduce the possibility of electric spark leakage in a limited space, strengthen the explosion-proof effect, and extend the product's service life.

[0029] In a further preferred configuration, the explosion-proof housing 3 has a positioning groove 35 on its top inner side, which is vertically spaced from the mounting groove 34. A top partition is provided between the positioning groove 35 and the mounting groove 34. The top partition has a connecting hole connecting the positioning groove 35 and the mounting groove 34. The stationary iron core 22 has a positioning protrusion 25 that passes through a limiting seat and is positioned and connected in the positioning groove 35. The fixing member 33 passes through the connecting hole and is fixedly connected to the positioning protrusion 25. The fixing member 33 is preferably a bolt guide post. The positioning protrusion 25 is provided with a corresponding screw hole structure that mates with the bolt guide post. The iron core 22 achieves precise positioning and installation between the coil structure 2 and the explosion-proof housing 3 through the precise cooperation of the positioning protrusion 25 and the positioning groove 35, which facilitates subsequent fastening installation through the fastener 33. With this structural design, the stationary iron core 22 is fixed by multiple fasteners such as the positioning protrusion 25, the positioning groove 35 and the fastener 33, combined with the rigid structure of the explosion-proof housing 3, which greatly enhances the vibration resistance of the coil structure 2. The explosion-proof top cover 31 is fixed in the positioning groove 35 to form the first explosion-proof surface 51. The first explosion-proof surface 51 plays an explosion-proof sealing role at the top of the partition housing, blocking the spark leakage between the external medium and the top gap.

[0030] like Figure 2 As shown, based on the connection of the first explosion-proof surface at the top of the explosion-proof housing 3, a first sealing ring 41 is provided between the explosion-proof top cover 31 and the inner wall of the mounting groove 34. The elastic deformation of the first sealing ring 41 effectively fills the tiny gap between the explosion-proof top cover 31 and the inner wall of the mounting groove 34, completely blocking the leakage of electric sparks through the gap, thus forming a double protection of the explosion-proof surface and the sealing surface at the top of the explosion-proof housing 3. In addition, based on the connection of the second explosion-proof surface at the bottom of the explosion-proof housing 3, a second sealing ring 42 is provided between the explosion-proof housing 3 and the connecting cover 202, and a third sealing ring 43 is provided between the connecting seat 201 and the connecting cover 202. The second sealing ring 42 seals and fills the fitting gap between the explosion-proof housing 3 and the connecting cover 202, and the third sealing ring 43 seals and fills the fitting gap between the connecting seat 201 and the connecting cover 202 inside the valve body, strengthening the sealing performance, thereby forming a double protection of the explosion-proof surface and the sealing surface at the bottom of the explosion-proof housing.

[0031] To facilitate the installation of the circuit board 7 that mates with the coil structure 2, the existing explosion-proof solenoid valve is combined with... Figure 1-2As shown, the explosion-proof housing 3 has an installation window 6 on its side. A circuit board 7 connected to the electromagnetic coil 21 is fixedly installed inside the installation window 6. A junction box cover 8 is installed in the installation window 6 to surround the circuit board 7. The junction box cover 8 and the explosion-proof housing 3 form a lateral explosion-proof space suitable for accommodating the circuit board 7 and wires. A third explosion-proof surface 53 is formed by the junction box cover 8 and the explosion-proof housing 3 around the installation window 6. This design forms a sealed explosion-proof barrier on the side of the explosion-proof housing 3, completely blocking the contact between the electrical sparks in the area of ​​the circuit board 7 and the external flammable medium. Together with the explosion-proof surfaces at the top and bottom of the explosion-proof housing 3, it forms an all-round three-dimensional explosion-proof system, eliminating the defect of ordinary solenoid valves that have no effective explosion-proof side, and meeting the all-dimensional explosion-proof requirements under high-risk working conditions.

[0032] For further optimization settings, refer to Figure 2 The explosion-proof housing 3 includes an enclosure 61 surrounding the mounting window 6 and a mounting step formed within the enclosure 61. The circuit board 7 is fixed to the mounting step by screws 71. The junction box cover 8 has a mating part 81 that is inserted into the enclosure 61. The mating part 81 is in close contact with the inner wall of the enclosure 61 to form a third explosion-proof surface 53. A fourth sealing ring 44 is provided between the mating part 81 and the inner wall of the enclosure. The fourth sealing ring 44 can seal and fill the mating gap between the partition housing and the junction box cover, thereby enhancing the sealing performance. In this embodiment, the connection lengths of the first explosion-proof surface 51, the second explosion-proof surface 52, and the third explosion-proof surface 53 are ≥6mm, which can better meet the explosion-proof requirements. The advantage of this design is that the explosion-proof housing 3, with its enclosing portion 61 and mounting step, provides an embedded mounting reference for the joint portion 81 of the junction box cover 8, ensuring high fitting accuracy and controllable gap between the joint portion 81 and the side wall of the mounting step. Thus, the third explosion-proof surface 53 is achieved through a precise fit between the enclosing portion 61 of the explosion-proof housing and the joint portion 81 of the junction box cover 8, preventing the explosion-proof surface from experiencing increased gap or misalignment due to vibration, ensuring the long-term stability of the explosion-proof performance. The third explosion-proof surface provides a dedicated, high-precision explosion-proof barrier for wiring connections, ensuring safe and reliable use.

[0033] To ensure the airtightness of the connection between the wire and the circuit board 7 when the wire enters the junction box cover 8, an explosion-proof stuffing box 9 is provided at the wiring port of the junction box cover 8. The explosion-proof stuffing box 9 is fastened to the wiring port of the junction box cover 8 by a threaded structure. In this structure, the explosion-proof stuffing box 9 and the wiring port are connected by copper and aluminum threads to form a threaded explosion-proof mating surface 91. The engagement length of the threaded explosion-proof mating surface 91 is ≥8mm. The threaded explosion-proof mating surface 91 is controlled by the engagement length and gap of the threads, thereby accurately preventing the leakage of electric sparks at the wire entry point. Furthermore, the explosion-proof stuffing box 9 is equipped with a sealing ring, The sealing structure, composed of components such as the sealing cone sleeve, tightly holds the wires inserted into the explosion-proof stuffing box 9, ensuring that the external wires pass through the explosion-proof stuffing box 9 and enter the junction box cover 8 to connect to the circuit board 7. This design prevents external flammable media and dust from seeping into the junction box through the gap between the wires and the explosion-proof stuffing box 9, and also blocks internal electrical sparks from leaking outward through the gaps in the wires. The explosion-proof stuffing box using this technical solution effectively solves the explosion-proof and sealing problems at the wire entry point through multiple protective designs of the threaded explosion-proof joint surface and the sealed wire-passing structure. It is a key guarantee for the safe and reliable operation of the explosion-proof solenoid valve at the wiring port.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An explosion-proof solenoid valve, comprising a valve body (1), a coil structure (2), and an explosion-proof housing (3), wherein the coil structure includes a connecting assembly (20) fixed to the valve body, and the explosion-proof housing (3) surrounds and is fitted over the outside of the coil structure (2), characterized in that: The top of the explosion-proof housing (3) is connected to the coil structure by a fastener (33). The bottom of the explosion-proof housing (3) is an opening (32) that fits into the connecting assembly (20). The top of the explosion-proof housing (3) is provided with a mounting groove (34). A connecting hole for connecting the fastener (33) is provided through the mounting groove (34), and an explosion-proof top cover (31) fitted into the mounting groove (34) and covering the fastener is provided. A first explosion-proof surface (51) is formed between the explosion-proof top cover (31) and the mounting groove (34) in a circumferential connection. The inner wall of the opening (32) is in close contact with the connecting assembly (20) to form a second explosion-proof surface (52) in a circumferential connection.

2. The explosion-proof solenoid valve according to claim 1, characterized in that: The connecting assembly (20) includes a connecting seat (201) disposed at the bottom of the coil structure and a connecting cover (202) sleeved on the connecting seat (201). The connecting seat is fixed on the valve body. The opening (32) of the explosion-proof housing (3) is fitted onto the connecting cover (202). The second explosion-proof surface (52) is formed between the explosion-proof housing (3) and the connecting cover (202) and between the connecting seat (201) and the connecting cover (202).

3. The explosion-proof solenoid valve according to claim 2, characterized in that: A first sealing ring (41) is provided between the explosion-proof top cover (31) and the inner wall of the mounting groove (34), a second sealing ring (42) is provided between the explosion-proof outer shell (3) and the connecting cover (202), and a third sealing ring (43) is provided between the connecting seat (201) and the connecting cover (202).

4. The explosion-proof solenoid valve according to claim 2, characterized in that: The coil structure (2) includes an electromagnetic coil (21) and a conduit (26) disposed in the inner cavity of the electromagnetic coil (21), as well as a stationary iron core (22) and a moving iron core (23) disposed in the conduit. It also includes a coil sleeve (24) sleeved on the outside of the electromagnetic coil (21). The upper end of the coil sleeve (24) is tightly fitted with a limiting seat (27), and its lower end is fixedly connected to the connecting cover (202) by welding. The stationary iron core is welded and fixed to the upper end of the conduit (26), and the lower end of the conduit (26) is fixedly connected to the connecting seat (201) by welding. The moving iron core (23) passes through the connecting seat (201) and is connected to the valve stem inside the valve body (1).

5. The explosion-proof solenoid valve according to claim 4, characterized in that: The explosion-proof housing (3) has a positioning groove (35) on the top inner side that is separated from the mounting groove (34) vertically. A top partition is provided between the positioning groove (35) and the mounting groove (34). The top partition has a connecting hole that connects the positioning groove (35) and the mounting groove (34). The stationary iron core (22) has a positioning protrusion (25) that passes through the limiting seat and is positioned and connected in the positioning groove (35). The fixing member (33) passes through the connecting hole and is fixedly connected to the positioning protrusion (25).

6. An explosion-proof solenoid valve according to any one of claims 1-5, characterized in that: The explosion-proof housing (3) has an installation window (6) on its side. A circuit board (7) connected to the electromagnetic coil (21) is fixed inside the installation window (6). The circuit board (7) is installed in the installation window (6) by a junction box cover (8) and surrounds the installation window (6). A third explosion-proof surface (53) is formed between the junction box cover (8) and the explosion-proof housing (3) around the installation window (6).

7. The explosion-proof solenoid valve according to claim 6, characterized in that: The explosion-proof housing (3) includes an enclosure (61) surrounding the mounting window (6) and a mounting step formed within the enclosure (61). The circuit board (7) is fixed to the mounting step by screws (71). The junction box cover (8) has a mating part (81) that is inserted into the enclosure (61). The mating part (81) is in close contact with the inner wall of the enclosure (61) to form a third explosion-proof surface (53). A fourth sealing ring (44) is provided between the mating part (81) and the inner wall of the enclosure.

8. The explosion-proof solenoid valve according to claim 7, characterized in that: The junction box cover (8) is provided with an explosion-proof stuffing box (9) at the wiring port, which allows wires to be sealed and inserted. The explosion-proof stuffing box (9) is fastened to the wiring port of the junction box cover (8) by a threaded structure, and a threaded explosion-proof joint surface (91) is formed between the explosion-proof stuffing box (9) and the wiring port.

9. The explosion-proof solenoid valve according to claim 8, characterized in that: The engagement length of the threaded explosion-proof mating surface (91) is ≥8mm.

10. An explosion-proof solenoid valve according to any one of claims 7-9, characterized in that: The connection lengths of the first explosion-proof surface (51), the second explosion-proof surface (52), and the third explosion-proof surface (53) are ≥6mm respectively.

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