Explosion-proof direct-acting electromagnetic valve

Abstract

The invention relates to an anti-explosion direct-acting electromagnetic valve which comprises a valve body. The sliding valve comprises a movable iron core and a valve element part, a mounting hole is formed in the movable iron core, a cone top column is arranged in the mounting hole, a thin-wall hole is formed in the valve element part, and the thin-wall hole is used for being in extrusion deformation with the cone top column so that the valve element part can be in interference fit with the mounting hole of the movable iron core. The sleeve is provided with a static iron core and a step surface; the anti-explosion shell comprises an anti-explosion shell body and an anti-explosion shell cover, the anti-explosion shell body is provided with a step matching surface which 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. The valve core part and the movable iron core adopt a split type structural design, so that the processing and manufacturing difficulty of the slide valve is effectively reduced; 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, and therefore the sleeve is limited in the axial direction of the sliding valve.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to an explosion-proof direct-acting solenoid valve. Background Art

[0002] As one of the actuators of the fluid control automation system, the solenoid valve is widely used in automatic control equipment in the manufacturing industry, energy, railway transportation, petroleum, chemical industry, nuclear power, military industry, marine and aerospace industries. The solenoid valve controls the armature by the generation or disappearance of electromagnetic force. The internal components will generate high temperature when working. When the solenoid valve controls the flammable gas fluid, there may be a risk of explosion. Therefore, an explosion-proof structure is required for protection, and the explosion-proof device should be easy to disassemble. When a certain structure of the explosion-proof device is damaged, it is convenient to disassemble and repair. In addition, in the existing solenoid valve slide valve structure, the valve core and the moving iron core are usually an integrated structure. The integrated structure of the valve core and the moving iron core has the problems of high processing difficulty and poor economy. Summary of the invention

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide an explosion-proof direct-acting solenoid valve, which is used to solve the problems of the existing direct-acting solenoid valve when used in combustible gas conditions, such as the risk of explosion due to high temperature generated when the internal components are working, and the integrated structure of the valve core and the moving iron core is difficult to process and has poor economy.

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

[0005] Valve body;

[0006] A slide valve is arranged in the valve body to reciprocate along its own axial direction, the slide valve is used to switch the working state of the valve body, the slide valve includes a moving iron core and a valve core member, the moving iron core is provided with a mounting hole, a cone top column is provided in the mounting hole, and a thin-walled hole is provided on the valve core member, the thin-walled hole is used to be squeezed and deformed with the cone top column so that the valve core member and the mounting hole of the moving iron core have an interference fit;

[0007] a sleeve, which is sleeved on the slide valve and threadedly connected to the valve body; a static iron core is provided at one end of the sleeve axially away from the valve body; the static iron core is coaxially arranged with the slide valve and located above the slide valve; and a step surface is 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. A step mating surface is provided on the explosion-proof shell. The step mating surface abuts against the step surface. At least two protrusions are distributed circumferentially in the explosion-proof shell.

[0009] An excitation shell, wherein at least two grooves are circumferentially arranged at the bottom of the excitation shell, and the grooves are concave-convexly matched with the convex column. A coil component is arranged in the excitation shell, and the coil component is arranged around the static iron core and the slide valve.

[0010] Optionally, the valve body is provided with an accommodating cavity along the axial direction, and the valve body is provided with a medium inlet, a medium outlet and a working port along the radial direction, and a valve seat and a contact platform are respectively provided at two ends of the valve body along the axial direction, and the valve seat and the contact platform are both located in the accommodating cavity, and the contact platform is located above the valve seat; a plurality of medium channels are provided on the contact platform and the valve seat, and the medium inlet is connected with the working port through the medium channel on the valve seat; and the medium outlet is connected with the working port through the medium channel on the contact platform.

[0011] Optionally, a valve plug is provided at one end of the valve core component axially away from the moving iron core, and a first sealing component and a second sealing component are respectively provided at both ends of the valve plug in the axial direction. The first sealing component is used to contact and seal with the valve seat to cut off the connection between the medium inlet and the working port; the second sealing component is used to contact and seal with the contact platform to cut off the connection between the medium outlet and the working port.

[0012] Optionally, a first conical portion is provided on the valve seat, and the first conical portion is used for extrusion sealing with the first sealing component; and a second conical portion is provided on the contact platform, and the second conical portion is used for extrusion sealing with the second sealing component.

[0013] Optionally, a first limiting portion is provided on the contact table, the first limiting portion is located between the valve body and the sleeve, and is respectively abutted and matched with the valve body and the sleeve; an elastic retaining ring is provided on the valve body, and a second limiting portion is provided on the valve seat, the second limiting portion is located between the valve body and the elastic retaining ring, and is respectively abutted and matched with the valve body and the elastic retaining ring.

[0014] Optionally, a first annular groove is provided on the valve body and a second annular groove is provided on the explosion-proof shell cover, and a first threaded hole and a second threaded hole are respectively opened on the explosion-proof shell corresponding to the first annular groove and the second annular groove, and the locking structure is threadedly connected to the first threaded hole and abuts with the first annular groove; the second threaded hole is used to insert a cylindrical end fixing screw and threadedly connect to the second threaded hole, and abuts with the second annular groove.

[0015] Optionally, a threaded connection portion is provided at one end of the static iron core axially away from the sleeve, and the excitation shell includes an excitation shell and an excitation shell cover, the threaded connection portion passes through the excitation shell along the axial direction of the static iron core, and the excitation shell cover is sleeved on the threaded connection portion, the threaded connection portion is used to connect a locking nut, the locking nut is abutted against the excitation shell cover, and a wave spring is provided between the locking nut and the excitation shell cover.

[0016] Optionally, an external grounding component is provided on the explosion-proof housing, and an internal grounding component is provided on the excitation shell cover; a connecting portion is provided on the moving iron core, and an elastic reset member is provided between the connecting portion and the sleeve.

[0017] Optionally, a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a sixth sealing ring are provided in sequence from top to bottom along the axial direction of the sliding valve, the first sealing ring is located between the explosion-proof shell cover and the explosion-proof shell; the second sealing ring is located between the explosion-proof shell and the valve body; the third sealing ring is located between the sleeve and the valve body; the fourth sealing ring is located between the contact table and the valve body; the fifth sealing ring and the sixth sealing ring are located between the valve seat and the valve body, and are located on both sides of the medium inlet in the radial direction.

[0018] Optionally, a snap-in groove is provided in the excitation shell, a snap-in portion is provided on the coil component, and the snap-in portion is snap-fitted with the snap-in groove; a magnetic conductive sleeve is also provided on the excitation shell.

[0019] As described above, the present invention has the following beneficial effects: through the cooperation of the thin-walled hole provided on the valve core member and the conical top column provided in the installation hole of the moving iron core, when the valve core member and the moving iron core are assembled, the conical top column opens the thin-walled hole along the radial direction of the moving iron core, so that the aperture of the thin-walled hole becomes larger, and the valve core member and the inner wall of the installation hole are interference-fitted, thereby realizing the connection between the valve core member and the moving iron core; the connection method is simple and convenient, and the valve core member and the moving iron core adopt a split structure design, which effectively reduces the difficulty of processing and manufacturing the slide valve; and the split slide valve structure is easy to maintain and replace. When the valve core member or the moving iron core fails, it can be replaced separately without replacing the entire solenoid valve, thereby reducing the maintenance cost and time. By sleeve-fitting the explosion-proof shell on the valve body and locking it with the valve body through the locking structure, the explosion-proof shell and the valve body are connected, and the explosion-proof shell is limited along the axial direction of the slide valve to prevent the explosion-proof shell and the valve body from loosening or axial movement. By setting an explosion-proof shell, the direct-acting solenoid valve proposed in this application can be applied to flammable and explosive media working conditions. The static iron core is connected to the valve body through a sleeve and suspended above the sliding valve. The sleeve is threadedly connected to the valve body. The connection method is simple and convenient. The step mating surface set on the explosion-proof shell is abutted with the step surface of the sleeve, so as to limit the sleeve along the axial direction of the sliding valve, thereby reducing the risk of loosening between the sleeve and the valve body or axial movement along the sliding valve. By setting at least two convex columns at the bottom of the explosion-proof shell and matching the concave-convex grooves set at the bottom of the excitation shell, the rapid positioning and installation of the excitation shell and the explosion-proof shell can be achieved, and the excitation shell can be limited along the circumferential direction of the explosion-proof shell to prevent the circumferential rotation between the excitation shell and the explosion-proof shell. 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 schematic cross-sectional structure diagram of an explosion-proof direct-acting solenoid valve shown in an embodiment of the present application;

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

[0022] Figure 3 Display as Figure 1 Schematic diagram of the cross-section structure of the middle explosion-proof shell;

[0023] Figure 4 Display as Figure 1 Schematic diagram of the cross-sectional structure of the middle valve body.

[0024] Description of Reference Numerals

[0025] Valve body 1, accommodating chamber 101, medium inlet 102, medium outlet 103, working port 104, first annular groove 105, sliding valve 2, moving iron core 201, mounting hole 201a, cone top column 201b, avoidance groove 201c, connecting part 201d, valve core part 202, thin-walled hole 202a, valve plug 202b, first sealing component 202c, second sealing component 202d, sleeve 3, step surface 301, static iron core 4, threaded connecting part 401, explosion-proof shell 5, explosion-proof shell 501, step matching surface 501a, boss 501b, first threaded hole 501c, second threaded hole 501d, external grounding component 501e, explosion-proof shell cover 502, second annular groove 502a, locking structure 6, excitation shell 7, excitation shell 701, groove 701a, clamping groove 701b, coil component 701c, clamping part 701d, magnetic sleeve 701e, excitation shell cover 702, internal grounding component 702a, valve seat 8, first conical part 801, second limiting part 802, contact platform 9, second conical part 901, first limiting part 902, medium channel 10, elastic retaining ring 11, locking nut 12, wave spring 13, elastic reset part 14, first sealing ring 15, second sealing ring 16, third sealing ring 17, fourth sealing ring 18, fifth sealing ring 19, sixth sealing ring 20. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] See also Figures 1 to 4It should be noted that the diagrams provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, so the diagrams only show the components related to the present invention rather than drawing according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. shown in the drawings attached to 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 limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect and purpose that the present invention can produce. 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 the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] Before describing the embodiments of the present invention in detail, the application environment of the present invention is described first. The technology of the present invention is mainly applied to the field of solenoid valve technology. The present invention is used to solve the problems that the existing direct-acting solenoid valves, when used in combustible gas conditions, have the risk of explosion due to the high temperature generated when the internal components are working, and the integrated structure of the valve core and the moving iron core has the problem of great processing difficulty and poor economy.

[0029] Please combine Figures 1 to 4 As shown, the present invention provides an explosion-proof direct-acting solenoid valve.

[0030] In an exemplary embodiment of the present application, an explosion-proof 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. The sliding valve 2 includes a moving iron core 201 and a valve core member 202, and the moving iron core 201 is provided with a mounting hole 201a, and a cone top column 201b is provided in the mounting hole 201a. A thin-walled hole 202a is provided on the valve core member 202, and the thin-walled hole 202a is used to squeeze and deform with the cone top column 201b so that the valve core member 202 and the mounting hole 201a of the moving iron core 201 have an interference fit; a sleeve 3, which is sleeved on the sliding valve 2 and threadedly connected to the valve body 1, and a static iron core 4 is provided at one end of the sleeve 3 axially away from the valve body 1, and the static iron core 4 is coaxially arranged with the sliding valve 2 , and is located above the sliding valve 2, a step surface 301 is provided on the sleeve 3; an explosion-proof shell 5, which is sleeved on the valve body 1 and locked or unlocked by a locking structure 6, the explosion-proof shell 5 includes an explosion-proof shell 501 and an explosion-proof shell cover 502, the explosion-proof shell cover 502 is threadedly connected to the explosion-proof shell 501, a step matching surface 501a is provided on the explosion-proof shell 501, the step matching surface 501a is abutted with the step surface 301, and at least two convex columns 501b are distributed circumferentially in the explosion-proof shell 501; an excitation shell 7, at least two grooves 701a are provided at the bottom of the excitation shell 7 along the circumferential direction, the grooves 701a are concave-convexly matched with the convex columns 501b, a coil component 701c is provided in the excitation shell 7, and the coil component 701c is arranged around the static iron core 4 and the sliding valve 2.

[0031] In this embodiment, the thin-walled hole 202a provided on the valve core member 202 cooperates with the conical top column 201b provided in the mounting hole 201a of the moving iron core 201. When the valve core member 202 and the moving iron core 201 are assembled, the conical top column 201b expands the thin-walled hole 202a along the radial direction of the moving iron core 201, so that the aperture of the thin-walled hole 202a becomes larger, and the valve core member 202 and the inner wall of the mounting hole 201a are interference fit, thereby realizing the connection between the valve core member 202 and the moving iron core 201; the connection method is simple and convenient, and the valve core member 202 and the moving iron core 201 adopt a split structure design, which effectively reduces the difficulty of processing and manufacturing the sliding valve 2; and the split sliding valve 2 structure is easy to maintain and replace. When the valve core member 202 or the moving iron core 201 fails, it can be replaced separately without replacing the entire solenoid valve, thereby reducing maintenance costs and time. 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 the present application can be applied to flammable and explosive 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 set on the explosion-proof shell 501 is abutted and matched with the step surface 301 of the sleeve 3, so as to limit the sleeve 3 along the axial direction of the sliding valve 2, and reduce 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 convex columns 501b at the bottom of the explosion-proof housing 501 and matching the concave-convex 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, and the excitation housing 7 can be limited along the circumferential direction of the explosion-proof housing 5 to prevent the excitation housing 7 and the explosion-proof housing 5 from rotating in the circumferential direction. By energizing the coil component 701c provided in the excitation housing 7 to generate a magnetic field, the static iron core 4 generates magnetic force to attract the moving iron core 201 to move upward, thereby completing the working state switching of the valve.

[0032] In an exemplary embodiment of the present application, the valve body 1 is provided with an accommodating cavity 101 in the axial direction, and the valve body 1 is provided with a medium inlet 102, a medium outlet 103 and a working port 104 in the radial direction. A valve seat 8 and a contact platform 9 are respectively provided at both ends of the valve body 1 in the axial direction. The valve seat 8 and the contact platform 9 are both located in the accommodating cavity 101, and the contact platform 9 is located above the valve seat 8; a plurality of medium channels 10 are provided on the contact platform 9 and the valve seat 8, and the medium inlet 102 is communicated with the working port 104 through the medium channel 10 on the valve seat 8; the medium outlet 103 is communicated with the working port 104 through the medium channel 10 on the contact platform 9.

[0033] In this embodiment, the medium outlet 103 is connected to the working port 104 through the medium channel 10 provided on the contact stage 9 ; the medium inlet 102 is connected to the working port 104 through the medium channel 10 provided on the valve seat 8 .

[0034] In an exemplary embodiment of the present application, a valve plug 202b is provided at one end of the valve core member 202 axially away from the moving iron core 201, and a first sealing component 202c and a second sealing component 202d are respectively provided at both ends of the valve plug 202b in the axial direction. The first sealing component 202c is used for contacting and sealing with the valve seat 8 to cut off the connection between the medium inlet 102 and the working port 104; the second sealing component 202d is used for contacting and sealing with the contact platform 9 to cut off the connection between the medium outlet 103 and the working port 104.

[0035] In this embodiment, the valve core member 202 and the contact platform 9 are clearance-matched, so that the valve core member 202 can move relative to the contact platform 9, and the valve plug 202b is located in the accommodating chamber 101 and between the contact platform 9 and the valve seat 8; the first sealing component 202c and the second sealing component 202d are sealing materials arranged on both sides of the valve plug 202b along the axial direction of the valve core member 202, including but not limited to O-rings, and the first sealing component 202c is squeezed and matched with the valve seat 8 to achieve sealing between the first sealing component 202c and the valve seat 8, thereby cutting off the connection between the medium inlet 102 and the working port 104; the second sealing component 202d is squeezed and sealed with the contact platform 9 to cut off the connection between the medium outlet 103 and the working port 104, thereby completing the working state switching of the solenoid valve.

[0036] In an exemplary embodiment of the present application, a first conical portion 801 is provided on the valve seat 8, and the first conical portion 801 is used for compression sealing with the first sealing component 202c; a second conical portion 901 is provided on the contact platform 9, and the second conical portion 901 is used for compression sealing with the second sealing component 202d.

[0037] In this embodiment, by providing a first conical portion 801 on the valve seat 8 for contact sealing with the first sealing component 202c, and providing a second conical portion 901 on the contact platform 9 for contact sealing with the second sealing component 202d, the contact area between the valve seat 8 and the first sealing component 202c, and between the contact platform 9 and the second sealing component 202d can be effectively reduced, the transitional compression of the sealing components can be alleviated, and the damage to the first sealing component 202c and the second sealing component 202d can be reduced, thereby extending the service life of the first sealing component 202c and the second sealing component 202d.

[0038] In an exemplary embodiment of the present application, a first limiting portion 902 is provided on the contact platform 9, and the first limiting portion 902 is located between the valve body 1 and the sleeve 3, and is respectively abutted and matched with the valve body 1 and the sleeve 3; an elastic retaining ring 11 is provided on the valve body 1, and a second limiting portion 802 is provided on the valve seat 8, and the second limiting portion 802 is located between the valve body 1 and the elastic retaining ring 11, and is respectively abutted and matched with the valve body 1 and the elastic retaining ring 11.

[0039] In this embodiment, the contact platform 9 and the valve body 1 are limited in axial installation along the valve body 1 by the first limiting portion 902, and the sleeve 3 is abutted against the first limiting portion 902 of the contact platform 9. Due to the threaded connection between the sleeve 3 and the valve body 1, the sleeve 3 abuts against the first limiting portion 902, thereby pressing and fixing the contact platform 9 along the axial direction of the valve body 1 to avoid upward axial movement between the contact platform 9 and the valve body 1; the elastic retaining ring 11 abuts against the second limiting portion 802 of the valve seat 8, which can effectively prevent the valve seat 8 from axially loosening or falling off from the valve body 1 under vibration conditions.

[0040] In an exemplary embodiment of the present application, a first annular groove 105 is provided on the valve body 1, a second annular groove 502a is provided on the explosion-proof shell cover 502, and a first threaded hole 501c and a second threaded hole 501d are respectively provided on the explosion-proof shell 501 corresponding to the first annular groove 105 and the second annular groove 502a. The locking structure 6 is threadedly connected to the first threaded hole 501c and abuts with the first annular groove 105; the second threaded hole 501d is used to insert a cylindrical end fixing screw and is threadedly connected to the second threaded hole 501d, and abuts with the second annular groove 502a.

[0041] In this embodiment, the locking structure 6 (the locking structure 6 is a flat-end set screw) is connected to the first threaded hole 501c provided on the explosion-proof shell 501 through a thread, and the end of the locking structure 6 is extended into the first annular groove 105 provided on the valve body 1, so that the locking structure 6 is abutted and matched with the bottom of the first annular groove 105, 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; 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 conveniently installed, and the cylindrical end set screw is connected to the second threaded hole 501d provided on the explosion-proof shell 501 through a thread, and the set screw is inserted into the second annular groove 502a and abutted and matched with 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.

[0042] 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, and the excitation shell 7 includes an excitation shell 701 and an excitation shell cover 702. The threaded connection portion 401 passes through the excitation shell 701 along the axial direction of the static iron core 4, and the excitation shell cover 702 is sleeved on the threaded connection portion 401. The threaded connection portion 401 is used to connect the locking nut 12, and the locking nut 12 is abutted against the excitation shell cover 702, and a wave spring 13 is provided between the locking nut 12 and the excitation shell cover 702.

[0043] In this embodiment, the excitation shell cover 702 is opened to facilitate the installation of the coil component 701c, and the locking nut 12 is threadedly connected to the threaded connection part 401 and pressed against the excitation shell cover 702, so that the excitation shell cover 702 presses the coil component 701c, thereby limiting the axial loosening or axial movement of the coil component 701c and the excitation shell cover 702 along the explosion-proof shell 501; by arranging a wave spring 13 between the excitation shell cover 702 and the locking nut 12, buffering can be achieved during vibration.

[0044] In an exemplary embodiment of the present application, an external grounding component 501e is provided on the explosion-proof shell 501, and an internal grounding component 702a is provided on the excitation shell cover 702; a connecting portion 201d is provided on the moving iron core 201, and an elastic reset member 14 is provided between the connecting portion 201d and the sleeve 3.

[0045] In this embodiment, the external grounding component 501e is a screw; the external grounding of the explosion-proof shell 501 is achieved by threading the screw on the explosion-proof shell 501, forming grounding protection, which can prevent the coil component 701c from generating arcs or sparks during use, thereby effectively avoiding the risk of fire or explosion; the internal grounding component 702a is a grounding column set on the excitation shell cover 702, and the setting of the grounding column can connect the excitation shell cover 702 with the ground through a wire to form a circuit. When abnormal conditions such as leakage and short circuit occur inside the device, the current can flow into the ground, thereby preventing the current from passing through the human body or other conductive objects and causing harm; the elastic reset member 14 is a spring. When the coil component 701c is powered off, the valve core member 202 applies a pre-tightening force to the first sealing component 202c and the valve seat 8 under the action of its own gravity and the elastic force of the reset spring, thereby isolating the working chamber formed by the medium inlet 102 and the working port 104.

[0046] In an exemplary embodiment of the present application, a first sealing ring 15, a second sealing ring 16, a third sealing ring 17, a fourth sealing ring 18, a fifth sealing ring 19 and a sixth sealing ring 20 are sequentially arranged along the axial direction of the sliding valve 2 from top to bottom. The first sealing ring 15 is located between the explosion-proof shell cover 502 and the explosion-proof shell 501; the second sealing ring 16 is located between the explosion-proof shell 501 and the valve body 1; the third sealing ring 17 is located between the sleeve 3 and the valve body 1; the fourth sealing ring 18 is located between the contact table 9 and the valve body 1; the fifth sealing ring 19 and the sixth sealing ring 20 are located between the valve seat 8 and the valve body 1, and are located on both sides of the medium inlet 102 in the radial direction.

[0047] In this embodiment, the first sealing ring 15 is used to seal the explosion-proof shell cover 502 and the explosion-proof shell 501 to prevent external media from entering the interior of the explosion-proof shell 501; the second sealing ring 16 is used to seal the connection between the explosion-proof shell 501 and the valve body 1 to prevent the medium from leaking from the connection position between the explosion-proof shell 501 and the valve body 1; the third sealing ring 17 is used to seal the sleeve 3 and the valve body 1 to prevent the medium from leaking from the connection position between the sleeve 3 and the valve body 1; the fourth sealing ring 18 is used to prevent the medium from leaking from the connection position between the contact platform 9 and the valve body 1; the fifth sealing ring 19 and the sixth sealing ring 20 are used to prevent the medium from leaking from the connection position between the valve seat 8 and the valve body 1.

[0048] In an exemplary embodiment of the present application, a snap-in groove 701b is provided in the excitation housing 701, and a snap-in portion 701d is provided on the coil component 701c, and the snap-in portion 701d is snap-fitted with the snap-in groove 701b; a magnetic conductive sleeve 701e is also provided on the excitation housing 701.

[0049] In this embodiment, the coil component 701c is placed in the excitation shell 701, and the circumferential positioning of the coil component 701c is achieved by embedding the protruding clamping portion 701d on the coil component 701c into the clamping groove 701b provided on the excitation shell 701. The coil component 701c is sealed with plastic to prevent the wire from getting wet. The coil component 701c causes the static iron core 4 to generate electromagnetic force through the magnetic sleeve 701e, and the static iron core 4 generates adsorption force on the moving iron core 201, and the moving iron core 201 drives the valve core component 202 to move upward.

[0050] In another exemplary embodiment, an avoidance groove 201c is provided in the mounting hole 201a, and the avoidance groove 201c is used to avoid the thin-wall deformation of the thin-wall hole 202a. The deformed thin wall enters the avoidance groove 201c, which can effectively reduce the risk of the valve core component 202 falling off from the mounting hole 201a.

[0051] In another exemplary embodiment, the explosion-proof housing 501 has a conical transition between the inner cavity wall surface for mounting the excitation housing 7 and the cylindrical section of the explosion-proof housing 501 for connecting with the valve body 1. The conical transition design can optimize the stress distribution inside the explosion-proof housing 501 and reduce the structural damage caused by stress concentration. At the same time, this design can also improve the structural strength of the explosion-proof housing 501, so that it can better withstand external pressure or impact.

[0052] In yet another exemplary embodiment, four grooves 701 a are evenly arranged at the bottom of the excitation housing 701 along the circumferential direction, and four protruding columns 501 b are arranged at the bottom of the explosion-proof housing 501 corresponding to the grooves 701 a .

[0053] Working principle: the thin-walled hole 202a provided on the valve core 202 cooperates with the cone-top column 201b provided in the mounting hole 201a of the moving iron core 201. When the valve core 202 and the moving iron core 201 are assembled, the cone-top column 201b expands the thin-walled hole 202a along the radial direction of the moving iron core 201, so that the aperture of the thin-walled hole 202a becomes larger, and the valve core 202 and the inner wall of the mounting hole 201a are interference-fitted, thereby realizing the connection between the valve core 202 and the moving iron core 201; the connection method is simple and convenient, and the valve core 202 and the moving iron core 201 adopt a split structure design, which effectively reduces the difficulty of processing and manufacturing the slide valve 2. The explosion-proof shell 5 is sleeved on the valve body 1 and locked with the valve body 1 through the locking structure 6, so as to connect the explosion-proof shell 5 and the valve body 1, and limit the explosion-proof shell 5 along the axial direction of the slide valve 2 to prevent the explosion-proof shell 5 and the valve body 1 from loosening or axial movement. By setting up the explosion-proof shell 5, the direct-acting solenoid valve proposed in the present application can be applied to flammable and explosive media working conditions. The static iron core 4 is connected to the valve body 1 through the sleeve 3 and suspended above the slide 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 set on the explosion-proof shell 501 is abutted and matched with the step surface 301 of the sleeve 3, so as to limit the sleeve 3 along the axial direction of the slide valve 2, and reduce the risk of loosening between the sleeve 3 and the valve body 1 or axial movement along the slide valve 2. By setting at least two convex columns 501b at the bottom of the explosion-proof shell 501 and matching with the groove 701a set at the bottom of the excitation shell 7, the rapid positioning and installation of the excitation shell 7 and the explosion-proof shell 5 can be achieved, and the excitation shell 7 can be limited along the circumferential direction of the explosion-proof shell 5 to prevent the excitation shell 7 and the explosion-proof shell 5 from rotating circumferentially. By energizing the coil component 701c disposed in the excitation shell 7 to generate a magnetic field, the stationary iron core 4 generates a magnetic force to attract the moving iron core 201 to move upward, thereby completing the switching of the working state of the valve.

[0054] 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 familiar with 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An explosion-proof direct-acting solenoid valve, characterized in that: include: Valve body; A slide valve is arranged in the valve body to reciprocate along its own axial direction, the slide valve is used to switch the working state of the valve body, the slide valve includes a moving iron core and a valve core member, the moving iron core is provided with a mounting hole, a cone top column is provided in the mounting hole, and a thin-walled hole is provided on the valve core member, the thin-walled hole is used to be squeezed and deformed with the cone top column so that the valve core member and the mounting hole of the moving iron core have an interference fit; a sleeve, which is sleeved on the slide valve and threadedly connected to the valve body; a static iron core is provided at one end of the sleeve axially away from the valve body; the static iron core is coaxially arranged with the slide valve and located above the slide valve; and a step surface is 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. A step mating surface is provided on the explosion-proof shell. The step mating surface abuts against the step surface. At least two protrusions are distributed circumferentially in the explosion-proof shell. An excitation shell, wherein at least two grooves are circumferentially arranged at the bottom of the excitation shell, and the grooves are concave-convexly matched with the convex column. A coil component is arranged in the excitation shell, and the coil component is arranged around the static iron core and the slide valve.

2. The explosion-proof direct-acting solenoid valve according to claim 1, characterized in that: The valve body is provided with an accommodating cavity along the axial direction, and is provided with a medium inlet, a medium outlet and a working port along the radial direction. A valve seat and a contact platform are respectively provided at two ends of the valve body along the axial direction, and the valve seat and the contact platform are both located in the accommodating cavity, and the contact platform is located above the valve seat; a plurality of medium channels are provided on the contact platform and the valve seat, and the medium inlet is communicated with the working port through the medium channel on the valve seat; and the medium outlet is communicated with the working port through the medium channel on the contact platform.

3. The explosion-proof direct-acting solenoid valve according to claim 2, characterized in that: A valve plug is provided at one end of the valve core component axially away from the moving iron core, and a first sealing component and a second sealing component are respectively provided at both ends of the valve plug in the axial direction. The first sealing component is used for contacting and sealing with the valve seat to cut off the connection between the medium inlet and the working port; the second sealing component is used for contacting and sealing with the contact platform to cut off the connection between the medium outlet and the working port.

4. The explosion-proof direct-acting solenoid valve according to claim 3, characterized in that: The valve seat is provided with a first conical portion, and the first conical portion is used for extrusion sealing with the first sealing component; the contact stage is provided with a second conical portion, and the second conical portion is used for extrusion sealing with the second sealing component.

5. The explosion-proof direct-acting solenoid valve according to claim 4, characterized in that: The contact platform is provided with a first limiting portion, which is located between the valve body and the sleeve and is respectively abutted and matched with the valve body and the sleeve; the valve body is provided with an elastic retaining ring, and the valve seat is provided with a second limiting portion, which is located between the valve body and the elastic retaining ring and is respectively abutted and matched with the valve body and the elastic retaining ring.

6. The explosion-proof direct-acting solenoid valve according to claim 1, characterized in that: The valve body is provided with a first annular groove, the explosion-proof shell cover is provided with a second annular groove, the explosion-proof shell is provided with a first threaded hole and a second threaded hole corresponding to the first annular groove and the second annular groove, respectively, the locking structure is threadedly connected to the first threaded hole and abuts with the first annular groove; the second threaded hole is used to insert a cylindrical end set screw to be threadedly connected to the second threaded hole and abuts with the second annular groove.

7. The explosion-proof 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, and the excitation shell includes an excitation shell and an excitation shell cover. The threaded connection portion passes through the excitation shell along the axial direction of the static iron core, and the excitation shell cover is sleeved on the threaded connection portion. The threaded connection portion is used to connect a locking nut, and the locking nut is abutted against the excitation shell cover, and a wave spring is provided between the locking nut and the excitation shell cover.

8. The explosion-proof direct-acting solenoid valve according to claim 1, characterized in that: The explosion-proof housing is provided with an external grounding component, and the excitation shell cover is provided with an internal grounding component; the moving iron core is provided with a connecting part, and an elastic reset part is provided between the connecting part and the sleeve.

9. The explosion-proof direct-acting solenoid valve according to claim 2, characterized in that: A first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a sixth sealing ring are arranged in sequence from top to bottom along the axial direction of the sliding valve, wherein the first sealing ring is located between the explosion-proof shell cover and the explosion-proof shell; the second sealing ring is located between the explosion-proof shell and the valve body; the third sealing ring is located between the sleeve and the valve body; the fourth sealing ring is located between the contact platform and the valve body; the fifth sealing ring and the sixth sealing ring are located between the valve seat and the valve body, and are located on both sides of the medium inlet in the radial direction.

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

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