Direct-acting electromagnetic valve explosion-proof structure

Abstract

The utility model relates to an explosion-proof structure of a direct-acting electromagnetic valve. The explosion-proof structure comprises a valve body and a slide valve, the sleeve is in threaded connection with the valve body and arranged on the sliding valve in a sleeving mode, a static iron core is connected to the sleeve, and a step face is arranged on the sleeve; the anti-explosion shell comprises an anti-explosion shell body and an anti-explosion shell cover, the anti-explosion shell body is matched with the step surface in an abutting mode, and at least two protruding columns are distributed in the anti-explosion shell body in the circumferential direction; at least two grooves are formed in the bottom of the excitation shell in the circumferential direction, the grooves are matched with the convex columns in a concave-convex mode, and a coil component is arranged in the excitation shell and surrounds the static iron core and the sleeve. And the explosion-proof shell is arranged, so that the device can be applied to inflammable and explosive medium working conditions and the like. The anti-explosion shell is matched with the step face of the sleeve in an abutting mode, so that the sleeve is limited in the axial direction of the sliding valve, and the risk that the sleeve and the valve body loosen or move in the axial direction of the sliding valve is reduced. And through concave-convex matching of the convex columns and the grooves, circumferential limiting of the excitation shell and the explosion-proof shell is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to an explosion-proof structure of a direct-acting electromagnetic valve. Background Art

[0002] Solenoid valves, as actuators in fluid control automation systems, are widely used in automated control equipment in manufacturing, energy, rail transportation, petroleum, chemical, nuclear power, military, marine, and aerospace industries. Solenoid valves control their armatures by generating or eliminating electromagnetic force. Operating these internal components generates high temperatures, creating a risk of explosion when controlling flammable gas flows. Therefore, an explosion-proof structure is required for protection. This explosion-proof device should be easily disassembled to facilitate repair in the event of structural damage. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an explosion-proof structure for a direct-acting solenoid valve, which is used to solve the problem that when the existing direct-acting solenoid valve is used in combustible gas working conditions, there is a risk of explosion due to high temperatures generated when the internal components are working.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides an explosion-proof structure of a direct-acting solenoid valve, comprising:

[0005] Valve body;

[0006] a slide valve, arranged in the valve body so as to reciprocate along its own axial direction, the slide valve being used to switch the working state of the valve body;

[0007] a sleeve, sleeved on the slide valve, the sleeve being threadedly connected to the valve body, a static iron core being provided at one end of the sleeve axially away from the valve body, the static iron core being coaxially arranged with the slide valve and located above the slide valve, and a stepped surface being provided on the sleeve;

[0008] An explosion-proof shell is sleeved on the valve body and locked or unlocked by a locking structure. The explosion-proof shell includes an explosion-proof shell and an explosion-proof shell cover. The explosion-proof shell cover is threadedly connected to the explosion-proof shell. The explosion-proof shell is provided with a step mating surface, the step mating surface abuts against the step surface, and at least two protrusions are distributed circumferentially in the explosion-proof shell.

[0009] The excitation shell has at least two grooves arranged circumferentially on the bottom thereof, the grooves being matched with the convex columns in a concave-convex manner, and a coil component being arranged inside the excitation shell, and the coil component being arranged around the static iron core and the sleeve.

[0010] Optionally, a first threaded hole is provided at the socket connection between the explosion-proof shell and the valve body, a first annular groove is provided on the valve body corresponding to the first threaded hole, and the locking structure is a flat-end set screw, which is threadedly connected to the explosion-proof shell and abuts against the first annular groove.

[0011] Optionally, a first sealing component is provided between the explosion-proof housing and the valve body; a second sealing component is provided between the sleeve and the valve body; and a third sealing component is provided between the explosion-proof shell cover and the explosion-proof housing.

[0012] Optionally, a second annular groove is provided on the explosion-proof shell cover, and a second threaded hole is provided in the explosion-proof shell corresponding to the second annular groove. The second threaded hole is used for threaded connection with a cylindrical end set screw, and the cylindrical end set screw is in abutment with the second annular groove.

[0013] Optionally, a third threaded hole is provided on the explosion-proof housing, and the third threaded hole is used for threaded connection to an external grounding component.

[0014] Optionally, a threaded connection portion is provided at one end of the static iron core axially away from the sleeve, and the threaded connection portion is used to connect a locking nut, and the locking nut is used to abut and cooperate with the excitation shell.

[0015] Optionally, the excitation shell includes an excitation shell and an excitation shell cover, the bottom of the excitation shell is evenly provided with four grooves along the circumference, the bottom of the explosion-proof shell is provided with four protrusions corresponding to the grooves, the threaded connection part passes through the excitation shell along the axial direction of the static iron core, the excitation shell cover is sleeved on the threaded connection part, the threaded connection part is used to connect the locking nut, a wave spring is provided between the locking nut and the excitation shell cover, the locking nut is in abutment with the wave spring, and the wave spring is in abutment with the excitation shell cover.

[0016] Optionally, an internal grounding component is provided on the excitation shell cover.

[0017] Optionally, a snap-fit ​​groove is provided in the excitation housing, a snap-fit ​​portion is provided on the coil component, and the snap-fit ​​portion is snap-fitted with the snap-fit ​​groove; and a magnetic conductive sleeve is further provided on the excitation housing.

[0018] Optionally, an elastic reset member is provided between the sleeve and the sliding valve.

[0019] As described above, the present invention has the following beneficial effects: by attaching an explosion-proof housing to the valve body and locking it to the valve body via a locking structure, the explosion-proof housing is connected to the valve body and the housing is limited in axial position along the sliding valve, preventing loosening or axial movement between the explosion-proof housing and the valve body. The provision of the explosion-proof housing enables the direct-acting solenoid valve proposed in this application to be applied to working conditions involving flammable and explosive media. The static iron core is connected to the valve body via a sleeve and suspended above the sliding valve. The sleeve is threadedly connected to the valve body, providing a simple and convenient connection. The stepped mating surface provided on the explosion-proof housing abuts against the stepped surface of the sleeve, limiting the sleeve in axial position along the sliding valve, reducing the risk of loosening or axial movement between the sleeve and the valve body. By providing at least two protrusions on the bottom of the explosion-proof housing that mate with grooves provided on the bottom of the excitation housing, the excitation housing and the explosion-proof housing can be quickly positioned and installed. Furthermore, the excitation housing can be limited in circumferential position along the explosion-proof housing, preventing circumferential rotation between the excitation housing and the explosion-proof housing. By energizing the coil component set in the excitation shell to generate a magnetic field, the static iron core generates magnetic force to attract the moving iron core to move upward, thereby completing the working state switching of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a cross-sectional schematic diagram of an explosion-proof structure of a direct-acting solenoid valve shown in an embodiment of the present application;

[0021] Figure 2 Shown is a cross-sectional schematic diagram of the valve body structure of a direct-acting solenoid valve shown in an embodiment of the present application;

[0022] Figure 3 Shown is a schematic cross-sectional structure diagram of a direct-acting solenoid valve according to an embodiment of the present application.

[0023] Description of Reference Numerals

[0024] Valve body 1, first annular groove 101, accommodating chamber 102, medium inlet 103, medium outlet 104, working port 105, contact platform 106, valve seat 107, through hole 108, slide valve 2, moving iron core 201, mounting hole 201a, cone top column 201b, valve core member 202, rod 202a, valve plug 202b, thin-walled hole 202c, first sealing ring 202d, second sealing ring 202e, sleeve 3, step surface 301, static iron core 4, threaded connection part 401, explosion-proof shell 5, explosion-proof shell 501, step mating surface 501a, Boss 501b, first threaded hole 501c, second threaded hole 501d, third threaded hole 501e, explosion-proof shell cover 502, second annular groove 502a, locking structure 6, excitation shell 7, excitation shell 701, groove 701a, snap-fit ​​groove 701b, magnetic sleeve 701c, excitation shell cover 702, internal grounding component 702a, snap-fit ​​portion 702b, coil component 8, first sealing component 9, second sealing component 10, third sealing component 11, external grounding component 12, locking nut 13, wave spring 14, elastic return member 15. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0026] See also Figures 1 to 3 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner, so the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components during actual implementation. During actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. illustrated in the drawings in this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0027] Before describing the embodiments of this utility model in detail, we will first describe the application environment of this utility model. The technology of this utility model is primarily applied in the field of solenoid valve technology. This utility model is designed to address the problem that existing direct-acting solenoid valves, when used in flammable gas conditions, have the risk of explosion due to the high temperatures generated by the internal components during operation.

[0028] Please combine Figures 1 to 3 As shown, the utility model provides an explosion-proof structure of a direct-acting solenoid valve.

[0029] In an exemplary embodiment of the present application, the explosion-proof structure of a direct-acting solenoid valve includes: a valve body 1; a sliding valve 2, which is arranged in the valve body 1 to reciprocate along its own axial direction, and the sliding valve 2 is used to switch the working state of the valve body 1; a sleeve 3, which is sleeved on the sliding valve 2, and the sleeve 3 is threadedly connected to the valve body 1, and a static iron core 4 is provided at one end of the sleeve 3 away from the valve body 1 in the axial direction, and the static iron core 4 is coaxially arranged with the sliding valve 2 and is located above the sliding valve 2, and a step surface 301 is provided on the sleeve 3; an explosion-proof shell 5, which is sleeved on the valve body 1 and is locked or unlocked by a locking structure 6, and the explosion-proof shell 5 includes an explosion-proof housing 501 and an explosion-proof housing cover 502. The explosion-proof housing cover 502 is threadedly connected to the explosion-proof housing 501. The explosion-proof housing 501 is provided with a stepped mating surface 501a, which abuts and mates with the stepped surface 301. At least two protrusions 501b are distributed circumferentially within the explosion-proof housing 501. The excitation housing 7 has at least two grooves 701a circumferentially formed at the bottom thereof, which mate with the protrusions 501b in a concave-convex manner. A coil component 8 is provided within the excitation housing 7 and is disposed around the static iron core 4 and the sleeve 3.

[0030] In this embodiment, the explosion-proof shell 5 is sleeved on the valve body 1 and locked to the valve body 1 through the locking structure 6, thereby connecting the explosion-proof shell 5 and the valve body 1, and limiting the axial position of the explosion-proof shell 5 along the sliding valve 2 to prevent loosening or axial movement between the explosion-proof shell 5 and the valve body 1. By providing the explosion-proof shell 5, the direct-acting solenoid valve proposed in this application can be applied to flammable, explosive and other media working conditions. The static iron core 4 is connected to the valve body 1 through the sleeve 3 and is suspended above the sliding valve 2. The sleeve 3 is threadedly connected to the valve body 1. The connection method is simple and convenient. The step mating surface 501a provided on the explosion-proof shell 501 is abutted and matched with the step surface 301 of the sleeve 3, thereby limiting the axial position of the sleeve 3 along the sliding valve 2, reducing the risk of loosening between the sleeve 3 and the valve body 1 or axial movement along the sliding valve 2. By providing at least two protrusions 501b at the bottom of the explosion-proof housing 501, which mate with the grooves 701a provided at the bottom of the excitation housing 7, the excitation housing 7 and the explosion-proof housing 5 can be quickly positioned and installed. The excitation housing 7 can also be limited circumferentially along the explosion-proof housing 5 to prevent circumferential rotation between the excitation housing 7 and the explosion-proof housing 5. By energizing the coil component 8 provided within the excitation housing 7 to generate a magnetic field, the static iron core 4 generates a magnetic force to attract the moving iron core 201 upward, thereby completing the valve's operating state switching. A conical transition is formed between the inner wall of the explosion-proof housing 501, where the excitation housing 7 is mounted, and the cylindrical section of the explosion-proof housing 501 used to connect to the valve body 1. This conical transition design can optimize the stress distribution within the explosion-proof housing 501 and reduce structural damage caused by stress concentration. At the same time, this design can also improve the structural strength of the explosion-proof housing 501, enabling it to better withstand external pressure or impact.

[0031] It is worth noting that the valve body 1 is provided with an accommodating chamber 102 along the axial direction, and the valve body 1 is further provided with a medium inlet 103, a medium outlet 104 and a working port 105 along the radial direction, and the medium inlet 103, the medium outlet 104 and the working port 105 are all connected with the accommodating chamber 102; a contact platform 106 is provided at the upper end of the valve body 1, and a valve seat 107 is provided at the lower end of the valve body 1, and a plurality of through holes 108 are provided along the contact platform 106 and the valve seat 107, and the medium inlet 103 is connected with the working port 105 through the through holes 108 provided on the valve seat 107 to form a working chamber; The port 104 is connected to the working port 105 through the through hole 108 provided on the contact platform 106 to form an exhaust chamber; the sliding valve 2 includes a moving iron core 201 and a valve core member 202, the moving iron core 201 is slidably arranged in the sleeve 3, an elastic reset member 15 is provided between the moving iron core 201 and the sleeve 3, a mounting hole 201a is provided at the lower end of the moving iron core 201, and a cone top column 201b is provided in the mounting hole 201a; the valve core member 202 includes a rod 202a and a valve plug 202b, the valve plug 202b is connected to one end of the rod 202a along the axial direction, and the rod 202a is provided along the axial direction. A thin-walled hole 202c is provided at one end axially away from the valve plug 202b, and the valve core member 202 is expanded and deformed by the cone top column 201b, so that the valve core member 202 and the mounting hole 201a are interference-fitted, thereby realizing the installation of the valve core member 202 and the movable iron core 201; the split structural design of the valve core member 202 and the movable iron core 201 can effectively reduce the difficulty of processing and manufacturing the sliding valve 2; the valve plug 202b is located between the contact platform 106 and the valve seat 107, and the valve plug 202b can move along the axial direction of the valve body 1, and the valve plug 202 b A first sealing ring 202d and a second sealing ring 202e are respectively provided at both ends of the axial direction of the rod portion 202a. The first sealing ring 202d is used to contact and seal with the valve seat 107 to cut off the working chamber and open the exhaust chamber; the second sealing ring 202e is used to contact and seal with the contact platform 106 to cut off the exhaust chamber and open the working chamber; by supplying power to the coil component 8, the moving iron core 201 moves toward the static iron core 4, thereby driving the valve plug 202b to move upward, so that the second sealing component 10 contacts and seals with the contact platform 106, thereby opening the working chamber.

[0032] In an exemplary embodiment of the present application, a first threaded hole 501c is provided at the socket connection portion of the explosion-proof shell 501 and the valve body 1, and a first annular groove 101 is provided on the valve body 1 corresponding to the first threaded hole 501c. The locking structure 6 is a flat-end set screw, and the locking structure 6 is threadedly connected to the explosion-proof shell 501 and abuts against the first annular groove 101.

[0033] In this embodiment, the locking structure 6 is threadedly connected to the first threaded hole 501c provided on the explosion-proof shell 501, and the end of the locking structure 6 is extended into the first annular groove 101 provided on the valve body 1, so that the locking structure 6 is abutted and matched with the bottom of the first annular groove 101, thereby realizing the connection between the explosion-proof shell 501 and the valve body 1, and limiting the axial position of the explosion-proof shell 501 along the valve body 1.

[0034] In an exemplary embodiment of the present application, a first sealing component 9 is provided between the explosion-proof housing 501 and the valve body 1 ; a second sealing component 10 is provided between the sleeve 3 and the valve body 1 ; and a third sealing component 11 is provided between the explosion-proof housing cover 502 and the explosion-proof housing 501 .

[0035] In this embodiment, the first sealing component 9 is used to seal the valve body 1 and the explosion-proof shell 501 to prevent the medium from entering the explosion-proof shell 501 or leaking from between the explosion-proof shell 501 and the valve body 1; the second sealing component 10 is used to seal the sleeve 3 and the valve body 1 to prevent the medium from leaking from the sleeve 3 into the explosion-proof shell 501, and the sleeve 3 and the static iron core 4 are fixed by welding; the third sealing component 11 is used to seal the explosion-proof shell cover 502 and the explosion-proof shell 501 to isolate the inner cavity of the explosion-proof shell 501 from the outside world; the first sealing component 9, the second sealing component 10, and the third sealing component 11 include but are not limited to O-rings.

[0036] In an exemplary embodiment of the present application, a second annular groove 502a is provided on the explosion-proof shell cover 502, and a second threaded hole 501d is provided in the explosion-proof shell 501 corresponding to the second annular groove 502a. The second threaded hole 501d is used to threadably connect a cylindrical end set screw, and the cylindrical end set screw is abutted against the second annular groove 502a.

[0037] In this embodiment, the explosion-proof shell cover 502 is threadedly connected to the explosion-proof shell 501, so that the explosion-proof shell cover 502 and the explosion-proof shell 501 can be easily installed. The cylindrical end fastening screw is threadedly connected to the second threaded hole 501d opened on the explosion-proof shell 501, and is inserted into the second annular groove 502a to abut against the bottom of the second annular groove 502a, thereby limiting the axial position of the explosion-proof shell cover 502 along the explosion-proof shell 501.

[0038] In an exemplary embodiment of the present application, a third threaded hole 501 e is provided on the explosion-proof housing 501 , and the third threaded hole 501 e is used for threaded connection to the external grounding component 12 .

[0039] In this embodiment, the third threaded hole 501e is a blind hole opened on the explosion-proof shell 501, and the external grounding component 12 is a screw; the external grounding of the explosion-proof shell 5 is achieved by threading the screw on the explosion-proof shell 501, forming grounding protection, which can prevent the coil component 8 from generating arcs or sparks during use, thereby effectively avoiding the risk of fire or explosion.

[0040] In an exemplary embodiment of the present application, a threaded connection portion 401 is provided at one end of the static iron core 4 axially away from the sleeve 3 . The threaded connection portion 401 is used to connect a locking nut 13 , and the locking nut 13 is used to abut against the excitation shell 7 .

[0041] In this embodiment, the threaded connection portion 401 of the static iron core 4 passes through the excitation shell 7, and the locking nut 13 is threadedly connected to the threaded connection portion 401, and the locking nut 13 is abutted against the excitation shell 7, thereby achieving axial limitation of the excitation shell 7 along the explosion-proof shell 501.

[0042] In an exemplary embodiment of the present application, the excitation shell 7 includes an excitation shell 701 and an excitation shell cover 702. The bottom of the excitation shell 701 is evenly provided with four grooves 701a along the circumferential direction. The bottom of the explosion-proof shell 501 is provided with four protrusions 501b corresponding to the grooves 701a. The threaded connection part 401 passes through the excitation shell 701 along the axial direction of the static iron core 4. The excitation shell cover 702 is sleeved on the threaded connection part 401. The threaded connection part 401 is used to connect the locking nut 13. A wave spring 14 is provided between the locking nut 13 and the excitation shell cover 702. The locking nut 13 is in abutment with the wave spring 14, and the wave spring 14 is in abutment with the excitation shell cover 702.

[0043] In this embodiment, the excitation shell cover 702 is opened to facilitate the installation of the coil component 8, and is threadedly connected to the threaded connection part 401 through the locking nut 13 and pressed against the wave spring 14, so that the wave spring 14 presses against the excitation shell cover 702, and the excitation shell cover 702 presses the coil component 8, thereby limiting the axial loosening or axial movement of the coil component 8 and the excitation shell cover 702 along the explosion-proof shell 501; by arranging the wave spring 14 between the excitation shell cover 702 and the locking nut 13, buffering can be achieved during vibration.

[0044] In an exemplary embodiment of the present application, an internal grounding component 702 a is provided on the excitation housing cover 702 .

[0045] In this embodiment, the internal grounding component 702a is a grounding post provided on the excitation housing cover 702. The grounding post connects the excitation housing cover 702 to the ground via a wire, forming an electrical circuit. If an abnormality such as leakage or a short circuit occurs within the device, the current flows to the ground, preventing harm from passing through the human body or other conductive objects.

[0046] In an exemplary embodiment of the present application, a snap-fit ​​groove 701b is provided in the excitation housing 701, and a snap-fit ​​portion 702b is provided on the coil component 8, which snaps into engagement with the snap-fit ​​groove 701b; a magnetic conductive sleeve 701c is also provided on the excitation housing 701.

[0047] In this embodiment, the coil component 8 is placed in the excitation shell 701, and the circumferential positioning of the coil component 8 is achieved by embedding the protruding clamping portion 702b on the coil component 8 into the clamping groove 701b provided on the excitation shell 701. The coil component 8 is sealed with plastic to prevent the wire from getting damp. The coil component 8 is energized to generate a magnetic field, and then the static iron core 4 generates a magnetic force. The static iron core 4 generates an adsorption force on the moving iron core 201, and the moving iron core 201 drives the valve core component 202 to move upward.

[0048] In an exemplary embodiment of the present application, an elastic return member 15 is provided between the sleeve 3 and the slide valve 2 .

[0049] In this embodiment, the elastic return member 15 is a return spring, which is connected between the moving iron core 201 and the sleeve 3. When the coil component 8 is powered off, the moving iron core 201 moves downward under the action of its own gravity and the elastic force of the return spring, driving the valve core member 202 to move downward, so that the first sealing ring 202d of the valve plug 202b abuts and cooperates with the valve seat 107, thereby cutting off the working chamber; the elastic return member 15 provides a pre-tightening force for the abutment between the first sealing ring 202d and the valve seat 107.

[0050] Working principle: by sleeve-fitting the explosion-proof shell 5 on the valve body 1 and locking it with the valve body 1 through the locking structure 6, the explosion-proof shell 5 is connected to the valve body 1, and the explosion-proof shell 5 is limited along the axial direction of the sliding valve 2 to prevent loosening or axial movement between the explosion-proof shell 5 and the valve body 1. By setting the explosion-proof shell 5, the direct-acting solenoid valve proposed in this application can be applied to flammable, explosive and other media working conditions. The static iron core 4 is connected to the valve body 1 through the sleeve 3 and is suspended above the sliding valve 2. The sleeve 3 is threadedly connected to the valve body 1. The connection method is simple and convenient. The step mating surface 501a provided on the explosion-proof shell 501 is abutted and matched with the step surface 301 of the sleeve 3, thereby limiting the axial position of the sleeve 3 along the sliding valve 2, reducing the risk of loosening between the sleeve 3 and the valve body 1 or axial movement along the sliding valve 2. By providing at least two protrusions 501b at the bottom of the explosion-proof housing 501, which mate with the grooves 701a at the bottom of the excitation housing 7, the excitation housing 7 and the explosion-proof housing 5 can be quickly positioned and installed. The excitation housing 7 can also be limited in the circumferential direction of the explosion-proof housing 5 to prevent circumferential rotation between the excitation housing 7 and the explosion-proof housing 5. By energizing the coil component 8 disposed within the excitation housing 7 to generate a magnetic field, the static iron core 4 generates a magnetic force to attract the moving iron core 201 and move it upward, thereby completing the working state switching of the valve.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A direct-acting solenoid valve explosion-proof structure, characterized in that: include: Valve body; a slide valve, arranged in the valve body so as to reciprocate along its own axial direction, the slide valve being used to switch the working state of the valve body; a sleeve, sleeved on the slide valve, the sleeve being threadedly connected to the valve body, a static iron core being provided at one end of the sleeve axially away from the valve body, the static iron core being coaxially arranged with the slide valve and located above the slide valve, and a stepped surface being provided on the sleeve; An explosion-proof shell is sleeved on the valve body and locked or unlocked by a locking structure. The explosion-proof shell includes an explosion-proof shell and an explosion-proof shell cover. The explosion-proof shell cover is threadedly connected to the explosion-proof shell. The explosion-proof shell is provided with a step mating surface, the step mating surface abuts against the step surface, and at least two protrusions are distributed circumferentially in the explosion-proof shell. The excitation shell has at least two grooves arranged circumferentially on the bottom thereof, the grooves being matched with the convex columns in a concave-convex manner, and a coil component being arranged inside the excitation shell, and the coil component being arranged around the static iron core and the sleeve.

2. The explosion-proof structure of a direct-acting solenoid valve according to claim 1, characterized in that: A first threaded hole is provided at the socket connection portion between the explosion-proof shell and the valve body, and a first annular groove is provided on the valve body corresponding to the first threaded hole. The locking structure is a flat-end set screw, which is threadedly connected to the explosion-proof shell and abuts against the first annular groove.

3. The explosion-proof structure of a direct-acting solenoid valve according to claim 1, characterized in that: A first sealing component is provided between the explosion-proof housing and the valve body; a second sealing component is provided between the sleeve and the valve body; and a third sealing component is provided between the explosion-proof shell cover and the explosion-proof housing.

4. The explosion-proof structure of a direct-acting solenoid valve according to claim 3, characterized in that: The explosion-proof shell cover is provided with a second annular groove, and the explosion-proof shell is provided with a second threaded hole corresponding to the second annular groove. The second threaded hole is used for threaded connection with a cylindrical end set screw, and the cylindrical end set screw is in abutment with the second annular groove.

5. The explosion-proof structure of a direct-acting solenoid valve according to claim 4, characterized in that: The explosion-proof housing is provided with a third threaded hole, and the third threaded hole is used for threaded connection with an external grounding component.

6. The explosion-proof structure of a direct-acting solenoid valve according to claim 1, characterized in that: A threaded connection portion is provided at one end of the static iron core axially away from the sleeve. The threaded connection portion is used to connect a locking nut, and the locking nut is used to abut and cooperate with the excitation shell.

7. The explosion-proof structure of a direct-acting solenoid valve according to claim 6, characterized in that: The excitation shell includes an excitation shell and an excitation shell cover. The bottom of the excitation shell is evenly provided with four grooves along the circumference. The bottom of the explosion-proof shell is provided with four protrusions corresponding to the grooves. The threaded connection part passes through the excitation shell along the axial direction of the static iron core. The excitation shell cover is sleeved on the threaded connection part. The threaded connection part is used to connect a locking nut. A wave spring is provided between the locking nut and the excitation shell cover. The locking nut is in abutment with the wave spring, and the wave spring is in abutment with the excitation shell cover.

8. The explosion-proof structure of a direct-acting solenoid valve according to claim 7, characterized in that: An internal grounding component is provided on the excitation shell cover.

9. The explosion-proof structure of a direct-acting solenoid valve according to claim 7, characterized in that: A clamping groove is provided in the excitation shell, and a clamping portion is provided on the coil component, and the clamping portion is clamped and matched with the clamping groove; a magnetic conductive sleeve is also provided on the excitation shell.

10. The explosion-proof structure of a direct-acting solenoid valve according to claim 1, characterized in that: An elastic reset member is provided between the sleeve and the slide valve.

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