CN210179036U - Electromagnetic valve and gas device - Google Patents

Abstract

The utility model relates to a solenoid valve and gas device, the solenoid valve include magnetic conduction support, coil pack, quiet iron core, sleeve and move the iron core. The magnetic conduction support comprises a first mounting plate, a side plate and a second mounting plate. In the assembling process, the sleeve can be firstly installed into the second through hole through the first through hole, then the movable iron core is installed into the sleeve, the first side wall is aligned with the first convex portion, the first convex portion moves into the bottom wall of the limiting groove along the first side wall, then the movable iron core is rotated, and the first convex portion moves to other areas of the limiting groove and moves in the limiting groove. Because first convex part sets up in the spacing inslot and only moves about in the spacing groove, the sleeve can prevent promptly to move the iron core and break away from out to alright in order to avoid among the assembling process inefficiency, change preface in-process compounding, and the bad phenomenon that the efficiency is low when detecting, work efficiency is higher, and it is comparatively convenient to move the assembled mode between iron core and the sleeve in addition.

Description

Electromagnetic valve and gas device

Technical Field

The utility model relates to a ooff valve especially relates to a solenoid valve and gas device.

Background

The electromagnetic valve can act rapidly under rated voltage, and drives the valve rod to act through electromagnetic force, and the valve rod drives the valve to open and close. The traditional electromagnetic valve comprises a bracket, a coil assembly, a static iron core, a movable iron core, a sleeve body, a magnetic conduction plate and a bracket. In order to simplify the structure and prevent the sealing ring from losing efficacy, the electromagnetic valve adopts an integrated sleeve structure, the sealing ring is removed, and the leakage condition caused by the failure of the sealing ring is avoided. However, the sealing cap and the movable iron core are mutually separated and matched with the coil assembly in the bracket, and in the production process, the testing and mounting links, the sealing cap and the movable iron core are easily separated from the coil assembly, so that the working efficiency is low.

Disclosure of Invention

The utility model provides a first technical problem provide a solenoid valve, it can improve production efficiency effectively.

The second technical problem solved by the present invention is to provide a gas device, which can effectively improve the production efficiency.

The first technical problem is solved by the following technical scheme:

a solenoid valve, comprising: the magnetic conduction bracket comprises a first mounting plate, a side plate and a second mounting plate, the first mounting plate is connected with the second mounting plate through the side plate, and the second mounting plate is provided with a first through hole; the coil assembly is arranged on the magnetic conductive bracket and comprises a winding frame and a lead wound on the winding frame, and the winding frame is provided with a second through hole corresponding to the first through hole; the static iron core is arranged in the second through hole; the sleeve penetrates through the first through hole and extends into the second through hole, the end face of the closed end of the sleeve is in abutting fit with the static iron core or is provided with a gap, and the inner side wall of the sleeve is provided with a first convex part; move the iron core, move the iron core movably set up in the sleeve, the lateral wall that moves the iron core is equipped with along axial direction's spacing groove, first convex part is movably located along axial direction the spacing inslot, first convex part can also along the spacing groove winds telescopic lateral wall rotates, the lateral wall that moves the iron core includes the follow the diapire of spacing groove extends to along axial direction move the first lateral wall of the terminal surface of iron core, first lateral wall with the interval sets up between the telescopic inside wall, first lateral wall with interval between the telescopic inside wall is not less than first convex part protrusion in the height of telescopic inside wall.

Solenoid valve, compare produced beneficial effect with the background art: in the assembling process, can be with the sleeve with move the iron core equipment together, then pass first through-hole with the sleeve again and stretch into the second through-hole, the lateral wall and the inconsistent cooperation of quiet iron core of telescopic blind end or be equipped with the clearance. The sleeve can be arranged in the second through hole through the first through hole, the movable iron core is arranged in the sleeve, the first side wall and the first convex portion are aligned, the first convex portion moves into the bottom wall of the limiting groove along the first side wall, then the movable iron core is rotated, and the first convex portion moves to other areas of the limiting groove and moves in the limiting groove. Because first convex part sets up in the spacing inslot and only moves about in the spacing groove, the sleeve can prevent promptly to move the iron core and break away from out to alright in order to avoid among the assembling process inefficiency, change preface in-process compounding, and the bad phenomenon that the efficiency is low when detecting, work efficiency is higher, and it is comparatively convenient to move the assembled mode between iron core and the sleeve in addition.

In one embodiment, the limiting groove is circumferentially arranged around the outer side wall of the movable iron core; the first convex part is formed by extruding the side wall of the sleeve from outside to inside.

In one embodiment, the solenoid valve further includes a sealing cap and an elastic member, the plunger is connected to the sealing cap, and the elastic member is disposed between the sealing cap and the second mounting plate. So, if need open the operation or when closing the operation, coil assembly's wire switch on power, the magnetic field that the wire lets in the electric current and forms can make and move the iron core along telescopic axial direction removal, moves the corresponding removal of sealed cap of drive when the iron core moves along telescopic axial direction, alright when the sealed cap removes in order to realize opening the operation or closing the operation. When the wire of the coil assembly is disconnected from the power supply, the sealing cap is reset under the action of the elastic piece.

In one embodiment, the open end of the sleeve extends outward to form an outer edge plate, the outer edge plate is laid on the second mounting plate, and the elastic member is disposed between the sealing cap and the outer edge plate. Therefore, on one hand, the closed end of the sleeve is in contact fit with the static iron core, and the outer edge plate extending outwards from the open end of the sleeve is laid on the second mounting plate, so that the gas can be prevented from leaking outwards through the sleeve, the sealing performance can be ensured, a sealing ring does not need to be arranged between the outer side wall of the static iron core and the inner side wall of the sleeve, and a sealing ring does not need to be arranged between the outer edge plate extending outwards from the open end of the sleeve and the magnetic conduction plate; on the other hand, the sealing performance is ensured without adopting a magnetic conduction plate and a plurality of sealing rings, the magnetic conduction plate and the plurality of sealing rings are omitted, and the number of parts is reduced, so that the structure can be effectively simplified, the assembly process is simplified, and the production efficiency is improved.

In one embodiment, the outer edge plate is provided with a chuck connected with the second mounting plate; and/or, the outer fringe board is equipped with more than one first mounting hole, the second mounting panel is equipped with more than one second mounting hole corresponding with first mounting hole, the outer fringe board passes through the installed part and inserts first mounting hole with behind the second mounting hole with the second mounting panel is fixed continuous. So, the outer fringe board is comparatively installed on the second mounting panel firmly, and the structure is firm.

In one embodiment, the elastic member is a spring, the outer edge plate is provided with a second protrusion around the second through hole, the outer edge plate is tightly attached to the second mounting plate, the spring is sleeved outside the movable iron core, and one end of the spring is sleeved outside the second protrusion. So, the second convex part can play spacing fixed action to the spring, guarantees structural stability. In addition, the other end of the spring is fixedly arranged on the sealing cap through a fixing piece.

In one embodiment, a positioning hole corresponding to the second through hole is formed in the first mounting plate, one end, away from the second mounting plate, of the static iron core is in contact fit with the first mounting plate, a protruding block is arranged on one end face, away from the second mounting plate, of the static iron core, and the protruding block is arranged in the positioning hole; a groove matched with the closed end is formed in one end, facing the second mounting plate, of the static iron core, and the closed end is arranged in the groove; the outer side wall of one end, facing the second mounting plate, of the static iron core is a conical surface. So, in quiet iron core installation, the lug of quiet iron core is direct cartridge to be positioned in the locating hole, and installation operation is comparatively convenient, need not to adopt traditional riveting fixed mode installation fixed. In addition, the blind end is installed in the recess, and the fixed effect of quiet iron core is stable. In addition, the conical surface of the end part of the static iron core influences the distribution of the magnetic field, and the moving of the movable iron core can be better controlled when the coil assembly is electrified.

In one embodiment, the solenoid valve further includes a magnetic pipe and a spacer, the magnetic pipe is sleeved outside the sleeve and located in the second through hole, and the spacer is disposed in the second through hole and located between the magnetic pipe and the stationary core. Therefore, the magnetic conduction pipe is additionally arranged in the magnetic conduction bracket, and forms a magnetic conduction loop with the static iron core and the magnetic conduction bracket, so that the movable iron core can be better driven to move when the conducting wire is electrified.

In one embodiment, the spacer is a spring, two ends of the spacer respectively abut against the magnetic conduction pipe and the static iron core, and the spacer is sleeved outside the sleeve; two ends of the winding frame respectively abut against the first mounting plate and the second mounting plate; the coil assembly further comprises a protective sleeve wound outside the lead and the winding frame; the first mounting plate, the side plate and the second mounting plate are of an integrated structure.

The second technical problem is solved by the following technical solutions:

a gas-fired device comprising: the electromagnetic valve.

Gas device, compare produced beneficial effect with the background art: in the assembling process, can be with the sleeve with move the iron core equipment together, then pass first through-hole with the sleeve again and stretch into the second through-hole, the lateral wall and the inconsistent cooperation of quiet iron core of telescopic blind end. The sleeve can be arranged in the second through hole through the first through hole, the movable iron core is arranged in the sleeve, the first side wall and the first convex portion are aligned, the first convex portion moves into the bottom wall of the limiting groove along the first side wall, then the movable iron core is rotated, and the first convex portion moves to other areas of the limiting groove and moves in the limiting groove. Because first convex part sets up in the spacing inslot and only moves about in the spacing groove, the sleeve can prevent promptly to move the iron core and break away from out to alright in order to avoid among the assembling process inefficiency, change preface in-process compounding, and the bad phenomenon that the efficiency is low when detecting, work efficiency is higher, and it is comparatively convenient to move the assembled mode between iron core and the sleeve in addition.

Drawings

Fig. 1 is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a solenoid valve according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a movable iron core according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a sleeve according to an embodiment of the present invention.

Reference numerals:

10. magnetic conduction support, 11, first mounting panel, 111, locating hole, 12, curb plate, 13, second mounting panel, 131, first through-hole, 132, second mounting hole, 20, coil pack, 21, bobbin, 211, second through-hole, 22, wire, 23, protective sheath, 30, quiet iron core, 31, lug, 32, recess, 33, tapered surface, 40, sleeve, 41, closed end, 42, first convex part, 43, outer fringe board, 431, first mounting hole, 432, second convex part, 44, the board of bending, 50, move the iron core, 51, spacing groove, 52, first lateral wall, 60, sealing cap, 70, elastic component, 71, stationary blade, 80, magnetic conduction pipe, 90, isolator.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In one embodiment, referring to fig. 1, 3 and 4, a solenoid valve includes a magnetic conductive bracket 10, a coil assembly 20, a stationary core 30, a sleeve 40 and a movable core 50. The magnetic conduction support 10 comprises a first mounting plate 11, a side plate 12 and a second mounting plate 13. The first mounting plate 11 is connected with the second mounting plate 13 through the side plate 12, and the second mounting plate 13 is provided with a first through hole 131. The coil assembly 20 is disposed on the magnetic conductive bracket 10, and the coil assembly 20 includes a bobbin 21 and a wire 22 wound on the bobbin 21. The bobbin 21 is provided with a second through hole 211 corresponding to the first through hole 131. The stationary core 30 is disposed in the second through hole 211. The sleeve 40 penetrates through the first through hole 131 and extends into the second through hole 211, the end face of the closed end 41 of the sleeve 40 is in contact fit with the static iron core 30 or is provided with a gap, and the inner side wall of the sleeve 40 is provided with a first convex part 42. The movable iron core 50 is movably disposed in the sleeve 40, and a limiting groove 51 along an axial direction is disposed on an outer side wall of the movable iron core 50. The first protrusion 42 is movably disposed in the limiting groove 51 along the axial direction, and the first protrusion 42 can further rotate around the outer sidewall of the sleeve 40 along the limiting groove 51. The outer side wall of the plunger 50 includes a first side wall 52 extending from the bottom wall of the stopper groove 51 to the end surface of the plunger 50 in the axial direction. After the movable iron core 50 is installed in the sleeve 40, the first sidewall 52 and the inner sidewall of the sleeve 40 are spaced apart, and the spacing between the first sidewall 52 and the inner sidewall of the sleeve 40 is not less than the height of the first protrusion 42 protruding from the inner sidewall of the sleeve 40.

Solenoid valve, compare produced beneficial effect with the background art: during the assembly process, the sleeve 40 and the plunger 50 may be assembled together, and then the sleeve 40 is inserted into the second through hole 211 through the first through hole 131, and the outer sidewall of the closed end 41 of the sleeve 40 is in contact fit with or provided with a gap with the stationary core 30. The sleeve 40 can be firstly installed into the second through hole 211 through the first through hole 131, then the movable iron core 50 is installed into the sleeve 40, the first side wall 52 is aligned with the first protruding portion 42, the first protruding portion 42 moves into the bottom wall of the limiting groove 51 along the first side wall 52, then the movable iron core 50 is rotated, and the first protruding portion 42 moves to other areas of the limiting groove 51 and moves in the limiting groove 51. Because first convex part 42 sets up in spacing groove 51 and only moves about in spacing groove 51, sleeve 40 can prevent promptly that movable iron core 50 from breaking away from out to alright in order to avoid the assembling process inefficiency, change preface in-process compounding, and detect the low bad phenomenon of efficiency, work efficiency is higher, and the equipment mode between movable iron core 50 and the sleeve 40 is comparatively convenient in addition.

In addition, referring to fig. 1 and 2, the sleeve 40 separates the driven iron core 50 and the fixed iron core of the switch-type electromagnetic valve, so that the switch-type electromagnetic valve is divided into two parts of contact gas and non-contact gas, and the gas can be prevented from leaking outwards through the sleeve 40, thereby ensuring the sealing performance, and thus, a sealing ring is not required to be arranged between the outer side wall of the static iron core 30 and the inner side wall of the sleeve 40.

It can be understood that, referring to fig. 1, fig. 3 and fig. 4, the size of the movable area range of the first protrusion 42 in the limiting groove 51 along the axial direction is larger than the working stroke of the movable iron core 50, so as to ensure that the movable iron core 50 can move to close the air outlet.

It is understood that, referring to fig. 1, 3 and 4, the plunger 50 has a cylindrical shape, and accordingly, the sleeve 40 has a cylindrical shape, so that the plunger 50 can rotate in the sleeve 40. Further, the first side wall 52 is a flat shape formed by grinding or cutting a part of the outer side wall of the movable iron core 50, so that after the movable iron core 50 is installed in the sleeve 40, the first side wall 52 and the inner side wall of the sleeve 40 are arranged at an interval, and by controlling the grinding amount or the cutting amount on the outer side wall of the movable iron core 50, the interval between the first side wall 52 and the inner side wall of the sleeve 40 can be controlled, so that the interval is not less than the height of the first protrusion 42 protruding out of the inner side wall of the sleeve 40.

In one embodiment, the limiting groove 51 is circumferentially disposed around the outer side wall of the plunger 50.

In one embodiment, the first protrusion 42 is formed by extruding the sidewall of the sleeve 40 from the outside to the inside.

In one embodiment, referring to fig. 1 and 2, the solenoid valve further includes a sealing cap 60 and an elastic member 70. The movable iron core 50 is connected with the sealing cap 60, and the elastic member 70 is disposed between the sealing cap 60 and the second mounting plate 13. Thus, if the opening operation or the closing operation is required, the wire 22 of the coil assembly 20 is powered on, the magnetic field formed by the current flowing through the wire 22 can enable the movable iron core 50 to move along the axial direction of the sleeve 40, the movable iron core 50 drives the sealing cap 60 to move correspondingly when moving along the axial direction of the sleeve 40, and the opening operation or the closing operation can be realized when the sealing cap 60 moves. When the power is cut off from the lead wires 22 of the coil block 20, the sealing cap 60 is restored by the elastic member 70.

In one embodiment, referring to fig. 1 and 2, an outer edge plate 43 extends outward from the open end of the sleeve 40, the outer edge plate 43 is laid on the second mounting plate 13, and the elastic member 70 is disposed between the sealing cap 60 and the outer edge plate 43. Therefore, on one hand, the closed end 41 of the sleeve 40 is in contact fit with the static iron core 30, and the outer edge plate 43 extending outwards from the opening end of the sleeve 40 is laid on the second mounting plate 13, so that the gas can be prevented from leaking outwards through the sleeve 40, the sealing performance can be ensured, a sealing ring does not need to be arranged between the outer side wall of the static iron core 30 and the inner side wall of the sleeve 40, and a sealing ring does not need to be arranged between the outer edge plate 43 extending outwards from the opening end of the sleeve 40 and the magnetic conduction plate; on the other hand, the sealing performance is ensured without adopting a magnetic conduction plate and a plurality of sealing rings, the magnetic conduction plate and the plurality of sealing rings are omitted, and the number of parts is reduced, so that the structure can be effectively simplified, the assembly process is simplified, and the production efficiency is improved.

In one embodiment, referring to fig. 1 and 3, the outer edge plate 43 is provided with a clamp connected to the second mounting plate 13. Thus, the outer edge plate 43 is stably mounted on the second mounting plate 13, and the structure is stable. Optionally, the outer edge plate 43 is provided with a bending plate 44 connected to said second mounting plate 13. The bent plate 44 can firmly connect the second mounting plate 13 and the outer edge plate 43.

In one embodiment, referring to fig. 2 and 3, the outer edge plate 43 is provided with more than one first mounting hole 431, the second mounting plate 13 is provided with more than one second mounting hole 132 corresponding to the first mounting hole 431, and the outer edge plate 43 is fixedly connected to the second mounting plate 13 after being inserted into the first mounting hole 431 and the second mounting hole 132 through a mounting member. Thus, the outer edge plate 43 is stably mounted on the second mounting plate 13, and the structure is stable.

In one embodiment, referring to fig. 1 and fig. 2, the elastic element 70 is a spring, the outer edge plate 43 is provided with a second protrusion 432 around the second through hole 211, the outer edge plate 43 is tightly attached to the second mounting plate 13, the spring is sleeved outside the movable iron core 50, and one end of the spring is sleeved outside the second protrusion 432. So, second convex part 432 can play spacing fixed action to the spring, guarantees structural stability. The other end of the spring is fixed to the sealing cap 60 by a fixing piece 71.

In an embodiment, referring to fig. 1 and fig. 2, a positioning hole 111 corresponding to the second through hole 211 is disposed on the first mounting plate 11, an end of the stationary core 30 away from the second mounting plate 13 is in contact with the first mounting plate 11, a protrusion 31 is disposed on an end surface of the stationary core 30 away from the second mounting plate 13, and the protrusion 31 is disposed in the positioning hole 111. Therefore, in the installation process of the static iron core 30, the convex block 31 of the static iron core 30 is directly inserted into and positioned in the positioning hole 111, the installation operation is convenient, and the installation and the fixation are not required to be carried out by adopting the traditional riveting and fixing mode.

In addition, the end of the stationary core 30 facing the second mounting plate 13 is provided with a groove 32 corresponding to the closed end 41, and the closed end 41 is installed in the groove 32. The closed end 41 is arranged in the groove 32, and the fixed effect of the static iron core 30 is stable.

In addition, an outer side wall of one end of the stationary core 30 facing the second mounting plate 13 is a tapered surface 33. The tapered surface 33 at the end of the static iron core 30 affects the magnetic field distribution, so that the moving iron core 50 can be better controlled to move when the coil assembly 20 is electrified.

Further, referring to fig. 1, fig. 3 and fig. 4, the bottom surface of the groove 32 is a plane, the end surface of the closed end 41 is a plane, and the end surface of the movable iron core 50 facing the bottom of the sleeve 40 is a plane, so that the stability of the combined structure is better.

In one embodiment, referring to fig. 1 and 2, the solenoid valve further includes a magnetic conduit 80 and a spacer 90. The magnetic conduction pipe 80 is sleeved outside the sleeve 40 and located in the second through hole 211, and the spacer 90 is disposed in the second through hole 211 and located between the magnetic conduction pipe 80 and the stationary core 30. Therefore, the magnetic conduction pipe 80 is additionally arranged in the magnetic conduction bracket 10 to form a magnetic conduction loop with the static iron core 30 and the magnetic conduction bracket 10, so that the movable iron core 50 can be better driven to move when the lead 22 is electrified.

Further, referring to fig. 1 and fig. 2, the spacer 90 is a spring, two ends of the spacer 90 respectively abut against the magnetic conduction pipe 80 and the stationary core 30, and the spacer 90 is sleeved outside the sleeve 40. Thus, the second elastic element 70 is in a compressed state, and applies an elastic force to the stationary core 30, so that the spacer 90, the flux tube 80 and the stationary core 30 can be stably installed in the second through hole 211. In addition, it is also convenient to mount the spacer 90, the flux tube 80, and the stationary core 30 into the second through hole 211 of the bobbin 21.

Further, referring to fig. 1 and 2, two ends of the bobbin 21 respectively abut against the first mounting plate 11 and the second mounting plate 13. Therefore, the electromagnetic valve is compact in structure and stable in combination.

Further, referring to fig. 1 and 2, the coil assembly 20 further includes a protective sleeve 23 wound around the lead 22 and the bobbin 21. Therefore, the protective sleeve 23 can protect the wires 22 wound outside the winding frame 21 to a certain degree, and the wires 22 are prevented from being scratched and damaged.

In one embodiment, the first mounting plate 11, the side plate 12 and the second mounting plate 13 are of a unitary structure.

In one embodiment, referring to fig. 1 to 3 again, a gas device includes the solenoid valve according to any one of the above embodiments.

Gas device, compare produced beneficial effect with the background art: during the assembly process, the sleeve 40 and the plunger 50 may be assembled together, and then the sleeve 40 is inserted into the second through hole 211 through the first through hole 131, and the outer sidewall of the closed end 41 of the sleeve 40 is in contact fit with the stationary plunger 30. The sleeve 40 can be firstly installed into the second through hole 211 through the first through hole 131, then the movable iron core 50 is installed into the sleeve 40, the first side wall 52 is aligned with the first protruding portion 42, the first protruding portion 42 moves into the bottom wall of the limiting groove 51 along the first side wall 52, then the movable iron core 50 is rotated, and the first protruding portion 42 moves to other areas of the limiting groove 51 and moves in the limiting groove 51. Because first convex part 42 sets up in spacing groove 51 and only moves about in spacing groove 51, sleeve 40 can prevent promptly that movable iron core 50 from breaking away from out to alright in order to avoid the assembling process inefficiency, change preface in-process compounding, and detect the low bad phenomenon of efficiency, work efficiency is higher, and the equipment mode between movable iron core 50 and the sleeve 40 is comparatively convenient in addition.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A solenoid valve, comprising:

the magnetic conduction bracket (10) comprises a first mounting plate (11), a side plate (12) and a second mounting plate (13), the first mounting plate (11) is connected with the second mounting plate (13) through the side plate (12), and the second mounting plate (13) is provided with a first through hole (131);

the coil assembly (20) is arranged on the magnetic conductive support (10), the coil assembly (20) comprises a bobbin (21) and a lead (22) wound on the bobbin (21), and the bobbin (21) is provided with a second through hole (211) corresponding to the first through hole (131);

a stationary core (30), the stationary core (30) being disposed in the second through hole (211);

the sleeve (40) penetrates through the first through hole (131) and extends into the second through hole (211), the end face of the closed end (41) of the sleeve (40) is in contact fit with the static iron core (30) or is provided with a gap, and the inner side wall of the sleeve (40) is provided with a first convex part (42);

a plunger (50), the plunger (50) being movably disposed in the sleeve (40), the outer side wall of the movable iron core (50) is provided with a limit groove (51) along the axial direction, the first convex part (42) is movably arranged in the limiting groove (51) along the axial direction, the first convex part (42) can also rotate around the outer side wall of the sleeve (40) along the limiting groove (51), the outer side wall of the movable iron core (50) comprises a first side wall (52) extending from the bottom wall of the limiting groove (51) to the end face of the movable iron core (50) along the axial direction, the first side wall (52) is arranged at a distance from the inner side wall of the sleeve (40), the interval between the first side wall (52) and the inner side wall of the sleeve (40) is not less than the height of the first convex part (42) protruding from the inner side wall of the sleeve (40).

2. The solenoid valve according to claim 1, characterized in that said limit groove (51) is circumferentially arranged around the outer side wall of said plunger (50); the first convex part (42) is formed by extruding the side wall of the sleeve (40) from outside to inside.

3. The solenoid valve according to claim 1, characterized in that it further comprises a sealing cap (60) and an elastic member (70), said plunger (50) being connected to said sealing cap (60), said elastic member (70) being arranged between said sealing cap (60) and said second mounting plate (13).

4. A solenoid valve according to claim 3, characterised in that the open end of the sleeve (40) has an outer edge plate (43) extending outwards, the outer edge plate (43) being laid on the second mounting plate (13), the elastic element (70) being arranged between the sealing cap (60) and the outer edge plate (43).

5. A solenoid valve according to claim 4, characterised in that said peripheral plate (43) is provided with a clip connected to said second mounting plate (13); and/or, the outer fringe plate (43) is equipped with more than one first mounting hole (431), the second mounting panel (13) is equipped with more than one second mounting hole (132) corresponding with first mounting hole (431), outer fringe plate (43) insert through the mounting piece first mounting hole (431) with behind the second mounting hole (132) with second mounting panel (13) fixed link to each other.

6. The electromagnetic valve according to claim 5, wherein the elastic member (70) is a spring, the outer edge plate (43) is provided with a second protrusion (432) around the second through hole (211), the outer edge plate (43) is closely attached to the second mounting plate (13), the spring is sleeved outside the plunger (50), and one end of the spring is sleeved outside the second protrusion (432).

7. The electromagnetic valve according to claim 1, characterized in that a positioning hole (111) corresponding to the position of the second through hole (211) is formed in the first mounting plate (11), and one end of the static iron core (30) away from the second mounting plate (13) is in contact fit with the first mounting plate (11), and a projection (31) is formed on one end face of the static iron core (30) away from the second mounting plate (13), wherein the projection (31) is arranged in the positioning hole (111); a groove (32) matched with the closed end (41) is formed in one end, facing the second mounting plate (13), of the static iron core (30), and the closed end (41) is arranged in the groove (32); the outer side wall of one end, facing the second mounting plate (13), of the static iron core (30) is a conical surface (33).

8. The electromagnetic valve according to claim 7, further comprising a magnetic conductive pipe (80) and a spacer (90), wherein the magnetic conductive pipe (80) is sleeved outside the sleeve (40) and located in the second through hole (211), and the spacer (90) is disposed in the second through hole (211) and located between the magnetic conductive pipe (80) and the stationary core (30).

9. The electromagnetic valve according to claim 8, wherein the spacer (90) is a spring, two ends of the spacer (90) respectively abut against the magnetic conduction pipe (80) and the static iron core (30), and the spacer (90) is sleeved outside the sleeve (40); two ends of the winding frame (21) respectively abut against the first mounting plate (11) and the second mounting plate (13); the coil component (20) further comprises a protective sleeve (23) wound outside the lead (22) and the bobbin (21); the first mounting plate (11), the side plate (12) and the second mounting plate (13) are of an integrated structure.

10. A gas-fired device, comprising: a solenoid valve as claimed in any one of claims 1 to 9.

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