Antimagnetic cover of double-flow electromagnetic valve

Abstract

The utility model discloses an antimagnetic cover for a double-flow electromagnetic valve, the double-flow electromagnetic valve comprises a valve body, a valve core is arranged at the upper part of the valve body, and a coil is sleeved outside the valve core; an opening is formed below the anti-magnetic cover, and the anti-magnetic cover surrounds the outer side of the coil; a connecting column is arranged at the upper end of the valve element, and a through connecting hole is formed in the antimagnetic cover. The connecting columns correspondingly penetrate through the connecting holes, and the upper ends of the connecting columns are in threaded connection with nuts. According to the scheme, the magnetic line acting direction of the external magnet can be changed, magnetic attraction of the external magnet to the electromagnetic valve is weakened, and therefore the electromagnetic valve can be prevented from being opened externally through the magnet to a certain extent; according to the scheme, a nut connection mode is adopted, installation is easy and reliable, the connection effect is stable, the nut of the novel design is preferably adopted, and the effects of more stable positioning connection, cheating prevention and the like can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic valves, and in particular relates to an anti-magnetic cover of a dual-flow electromagnetic valve. Background Art

[0002] The dual flow solenoid valve is mainly composed of valve body, valve cover, coil, flow pilot valve, diaphragm and spring. When the coil is energized, the magnetic force generated attracts the flow pilot valve to open, so that the solenoid valve is opened. However, when a magnet is applied to the dual flow solenoid valve, if the suction force of the magnet is greater than the suction force of the coil, it can also attract the flow pilot valve to open, thereby opening the solenoid valve. Therefore, a solution is needed to prevent the external magnetic field from affecting the operation of the solenoid valve. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a dual-flow electromagnetic valve anti-magnetic cover to solve the problem that the external magnetic field affects the operation of the electromagnetic valve, and the structure is simple, effective and suitable for application.

[0004] According to the technical solution of the utility model, the utility model provides a dual-flow solenoid valve anti-magnetic cover, the dual-flow solenoid valve includes a valve body, a valve core is provided on the upper part of the valve body, and a coil is provided outside the valve core; an opening is provided below the anti-magnetic cover, and the anti-magnetic cover is surrounded and arranged on the outside of the coil; a connecting column is provided at the upper end of the valve core, and a through connecting hole is provided on the anti-magnetic cover; the connecting column passes through the connecting hole accordingly and is threadedly connected with a nut at the upper end.

[0005] Furthermore, a spring washer is arranged between the nut and the anti-magnetic cover, and the spring washer is sleeved outside the connecting column.

[0006] Furthermore, the spring washer is a saddle spring washer or a wave spring washer.

[0007] Furthermore, a protruding positioning ring is provided at the center of the bottom of the nut, and the positioning ring concentrically surrounds the screw hole of the nut, and a washer positioning surface is formed between the outer side of the positioning ring and the rest of the nut; the diameter of the connecting hole is larger than the diameter of the upper end of the connecting column, and the diameter of the connecting hole matches the outer diameter of the positioning ring, and the positioning ring is embedded in the connecting hole; the inner diameter of the spring washer is larger than or equal to the diameter of the connecting hole, and the spring washer is sandwiched between the anti-magnetic cover and the washer positioning surface in a conflicting manner.

[0008] Furthermore, the bottom of the connecting column is threadedly connected to the top of the valve core.

[0009] Furthermore, the anti-magnetic cover includes a cover body and a bottom plate connected below the cover body, an opening is formed in the middle of the bottom plate, and the bottom plate is sleeved outside the valve body.

[0010] Furthermore, a tin foil sticker is attached to the outer side of the anti-magnetic cover, and an iron sheet is attached to the outer side or the inner side of the tin foil sticker.

[0011] Further, a through strip hole is formed in the nut, and a seal strip is inserted into the strip hole and wound around the outside of the overall structure formed by the magnetic shield and the valve body.

[0012] Further, the threaded hole of the nut is a blind hole with an opening facing downward, and the strip hole is located at the top of the nut and has a gap from the blind hole; and / or, on one nut, the strip hole is at least two through holes with different length directions.

[0013] Further, there are two valve cores arranged side by side, and both upper ends of the two valve cores are provided with connecting columns. The material of the magnetic shield is magnetic steel, and the materials of the nut and the connecting column are aluminum alloy.

[0014] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0015] The magnetic shield of the dual-flow solenoid valve of the present utility model, after being installed on the dual-flow solenoid valve, can change the acting direction of the magnetic force lines of the externally applied magnet, weaken the magnetic attraction generated by the externally applied magnet on the solenoid valve, so as to prevent the solenoid valve from being opened externally by a magnet to a certain extent. After adopting this solution, the experimental results show that when the specification of a single magnet is φ50×10mm and about 3000 Gs, and under the action of 20 magnets at the same time, the dual-flow solenoid valve cannot be opened. This solution adopts a nut connection method, which is simple and reliable to install, has a stable connection effect, and preferably adopts a nut with a new design, which can achieve more stable positioning connection and anti-cheating effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded view according to an embodiment of the present utility model.

[0017] Figure 2 is a cross-sectional structural schematic diagram according to another embodiment of the present utility model.

[0018] Figure 3 is a three-dimensional structural schematic diagram of a nut according to an embodiment of the present utility model.

[0019] Figure 4 is Figure 3 the cross-sectional structural schematic diagram of the shown nut.

[0020] Figure 5 is a cross-sectional structural schematic diagram of a nut according to still another embodiment of the present utility model.

[0021] Figure 6 is a schematic diagram of the principle of the external magnet affecting the valve core without a magnetic shield.

[0022] Figure 7 is a schematic diagram of the principle of the magnetic shield weakening the influence of the magnet with a magnetic shield.

[0023] Description of reference numerals in the accompanying drawings:

[0024] 1. Valve body; 2. Spool; 3. Coil; 4. Anti-magnetic cover; 5. Connecting column; 6. Connecting hole; 7. Nut; 8. Spring washer; 9. Positioning ring; 10. Washer positioning surface; 11. Cover body; 12. Bottom plate; 13. Tinfoil sticker; 14. Iron sheet; 15. String hole; 16. Magnet. Detailed implementation manners

[0025] The present utility model provides an anti-magnetic cover for a dual-flow solenoid valve, which solves the problem that the external magnetic field affects the operation of the solenoid valve, and has a simple and effective structure and is suitable for application.

[0026] Please refer to Figure 1 , Figure 2 , an anti-magnetic cover for a dual-flow solenoid valve according to an embodiment of the present invention is applicable to a dual-flow solenoid valve. The dual-flow solenoid valve is a prior art, which mainly includes a valve body 1, a spool 2 is arranged on the upper part of the valve body 1, a flow pilot valve is provided on the spool 2, and a coil 3 (coil assembly) is sleeved outside the spool 2; the structure of such a solenoid valve will not be elaborated here. The anti-magnetic cover 4 of this solution is in the structure of a cover body (or a shell), there is an opening below the anti-magnetic cover 4, and the anti-magnetic cover 4 is arranged to surround the outside of the coil 3; more specifically, the anti-magnetic cover 4 can be selected to completely surround each surface of the coil 3, or as Figure 1 shown, one side surface (rear surface) of the coil 3 is the part for leading out the cable and is far away from the spool 2, so the anti-magnetic cover 4 can be selected to only have the front, upper, left and right four surfaces. A connecting column 5 is provided at the upper end of the spool 2, and a through connecting hole 6 is provided on the anti-magnetic cover 4; the connecting column 5 correspondingly passes through the connecting hole 6 and is threadedly connected with a nut 7 at the upper end, so as to fixedly install the anti-magnetic cover 4 and the dual-flow solenoid valve as a whole.

[0027] More specifically, a spring washer 8 is arranged between the nut 7 and the anti-magnetic cover 4. The spring washer 8 is, for example, a saddle-shaped spring washer or a corrugated spring washer. The spring washer 8 is sleeved outside the connecting column 5, so that the connection is more stable and has an anti-loosening effect.

[0028] Please also refer to Figures 3 to 5Preferably, a protruding positioning ring 9 is provided at the center of the bottom of the nut 7, and the positioning ring 9 is concentrically arranged around the screw hole of the nut 7, and a washer positioning surface 10, for example, in the form of a ring, is formed between the outer side of the positioning ring 9 and the rest of the nut 7. The diameter of the connecting hole 6 is larger than the diameter of the upper end of the connecting column 5, and the diameter of the connecting hole 6 matches the outer diameter of the positioning ring 9, and the positioning ring 9 is embedded in the connecting hole 6; of course, the upper end of the connecting column 5 has an external thread, and the screw hole of the nut 7 has an internal thread, and the diameters of the two match. The inner diameter of the spring washer 8 is larger than or equal to the diameter of the connecting hole 6, and the spring washer 8 is sandwiched between the anti-magnetic cover 4 and the washer positioning surface 10 in a conflicting manner. In this solution, the nut 7 has a better positioning effect, can ensure a tight connection, and it is not easy for the anti-magnetic cover 4 to shake or collide with its internal structure.

[0029] More specifically, the nut 7 is, for example, a structure with a circular cross section, a cylindrical outer surface, and a surface knurling on the outer surface at the largest diameter for easy screwing. Figure 4 , Figure 5 As shown, nuts 7 of different shapes and models can be designed according to specific circumstances, for example, the heights of the positioning rings 9 and the internal structures of the screw holes are different, so as to be suitable for different solenoid valves and anti-magnetic cover structures.

[0030] In some embodiments, the bottom of the connecting column 5 is threadedly connected to the top of the valve core 2. For example, the top of the valve core 2 has an external thread, and the bottom of the connecting column 5 has an internal thread, so that the two are threadedly connected. The split design of the connecting column 5 and the valve core 2 facilitates the production and installation of parts, so that the present solution can be more conveniently applied to the existing dual-flow solenoid valve.

[0031] like Figure 2 In the illustrated embodiment, the anti-magnetic cover 4 includes a cover body 11 and a bottom plate 12 connected to the bottom of the cover body 11, an opening is formed in the middle of the bottom plate 12, and the bottom plate 12 is sleeved outside the valve body 1; the size of the opening is, for example, matched with the valve body 1 and smaller than the coil 3. The assembly process of the anti-magnetic cover 4 of this solution is, for example, first installing the bottom plate 12 on the valve body 1 of the dual-flow solenoid valve, then sleeve the coil 3 of the dual-flow solenoid valve, and then fix the connecting column 5 to the valve body 1 (the valve core 2) through a threaded connection, and then sleeve the cover body 11 and tighten it with the nut 7.

[0032] It is understandable that the material used for the anti-magnetic cover 4 (bottom plate 12 and cover body 11) is, for example, anti-magnetic steel, or other materials that can play an anti-magnetic role. The bottom plate 12 and the cover body 11 are combined (or the single anti-magnetic cover 4 itself) to form a space, which can change the direction of the magnetic force lines of the external magnet and weaken the magnetic attraction of the external magnet to the valve core 2 of the solenoid valve. The material used for the nut 7 and the connecting column 5 is, for example, aluminum alloy, or other materials that can prevent magnet attraction.

[0033] More preferably, as Figure 2 shown, a tin foil sticker 13 is attached to the outer side surface of the magnetic shield 4, and an iron sheet 14 is attached to the outer or inner side of the tin foil sticker 13. Among them, the attachment includes bonding or other ways of fitting (such as not using an adhesive locally or not using an adhesive at all), in short, the tin foil sticker 13 and the iron sheet 14 are arranged along the outer side surface of the magnetic shield 4. The iron sheet 14 can be selected as one or more, and the area of a single iron sheet 14 is relatively small. When a super-strong magnet attracts from the outside of the magnetic shield 4, the magnet will firmly attract the iron sheet 13, and it is easy to cause damage to the tin foil sticker 13 when the magnet is removed, thus leaving a damage mark, playing a role in preventing cheating.

[0034] Furthermore, a through strip hole 15 is opened in the nut 7, and a seal is inserted into the strip hole 15. The seal is, for example, a lead seal or a plastic seal, etc., which plays a locking role, and is preferably disposable and can only be opened by breaking it. The seal is wound around and tied to the outside of the whole formed by the magnetic shield 4 and the valve body 1. It can be imagined that the structure of the valve body 1 has concavities and convexities, edges and corners, or there are through holes on the valve body 1 through which the seal can pass. Therefore, it is sufficient to ensure that the seal can be tightly tied, and the seal cannot be removed without opening the seal. This solution adopts such a nut with a hole and a seal, which can play a reinforcing role, prevent the nut from rotating, and can also prevent the magnetic shield 4 from being disassembled abnormally. And for the solution with the aforementioned tin foil sticker 13, there is no space for re-pasting the tin foil sticker 13 after it is damaged.

[0035] In this solution, the valve cores 2 of the double-flow solenoid valve are two arranged side by side. The upper ends of both valve cores 2 have connecting columns 5 (and related structures). The connecting columns 5, nuts 7, etc. of the two valve cores 2 can adopt the same part structure. Especially for the solution with a seal, the two nuts 7 can be inserted into the same seal, further enhancing the effect of preventing the nut 7 from rotating.

[0036] In the preferred embodiment, the screw hole of the nut 7 is a blind hole with the opening facing downwards. The strip hole 15 is located at the top of the nut 7 and has a gap with the blind hole. It can be understood that in other embodiments, when the nut 7 is wider or other conditions are sufficient to ensure that the strength and function of the nut are not affected, the strip hole 15 can also be selected on the side of the screw hole, etc. Preferably, on one nut 7, the strip hole 15 is at least two through holes with different length directions, for example, two through holes in a cross shape, which is convenient for inserting the seal at different angles, and two (or more) seals with different directions can be selected to be arranged on one nut 7 to enhance the role of the seal.

[0037] In summary, after the magnetic shield of the double-flow solenoid valve of the present utility model is installed on the double-flow solenoid valve, as Figure 6 , Figure 7As shown, the direction of the magnetic field lines of the externally applied magnet 16 can be changed, weakening the magnetic attraction of the externally applied magnet 16 on the solenoid valve, thereby preventing the solenoid valve from being opened externally by the magnet 16 to a certain extent. After adopting this solution, the experimental results show that when the specification of a single magnet is φ50×10mm and about 3000 Gs, and under the action of 20 magnets at the same time, the double-flow solenoid valve cannot be opened. This solution adopts a nut connection method, which is simple and reliable to install, has a stable connection effect, and preferably uses a nut with a new design, which can achieve more stable positioning connection and anti-cheating effects.

Claims

1. A dual-flow solenoid valve anti-magnetic cover, characterized in that: The dual-flow solenoid valve comprises a valve body (1), wherein a valve core (2) is provided on the upper part of the valve body (1), and a coil (3) is provided on the outer sleeve of the valve core (2); an opening is provided below the anti-magnetic cover (4), and the anti-magnetic cover (4) is arranged to surround the outer side of the coil (3); a connecting column (5) is provided at the upper end of the valve core (2), and a connecting hole (6) is provided on the anti-magnetic cover (4); the connecting column (5) passes through the connecting hole (6) correspondingly and a nut (7) is threadedly connected at the upper end.

2. The dual flow solenoid valve anti-magnetic cover according to claim 1, characterized in that: A spring washer (8) is provided between the nut (7) and the anti-magnetic cover (4), and the spring washer (8) is sleeved outside the connecting column (5).

3. The dual flow solenoid valve anti-magnetic cover according to claim 2 is characterized in that: The spring washer (8) is a saddle-shaped spring washer or a wave spring washer.

4. The dual flow solenoid valve anti-magnetic cover according to claim 2, characterized in that: A protruding positioning ring (9) is provided at the center of the bottom of the nut (7), the positioning ring (9) concentrically surrounding the screw hole of the nut (7), and a washer positioning surface (10) is formed between the outer side of the positioning ring (9) and the rest of the nut (7); The diameter of the connecting hole (6) is greater than the diameter of the upper end of the connecting column (5), and the diameter of the connecting hole (6) matches the outer diameter of the positioning ring (9), and the positioning ring (9) is embedded in the connecting hole (6); the inner diameter of the spring washer (8) is greater than or equal to the diameter of the connecting hole (6), and the spring washer (8) is sandwiched between the anti-magnetic cover (4) and the washer positioning surface (10) in a manner of contacting each other.

5. The dual flow solenoid valve anti-magnetic cover according to claim 1, characterized in that: The bottom of the connecting column (5) is threadedly connected to the top of the valve core (2).

6. The dual flow solenoid valve anti-magnetic cover according to claim 1, characterized in that: The anti-magnetic cover (4) comprises a cover body (11) and a bottom plate (12) connected below the cover body (11), the opening being formed in the middle of the bottom plate (12), and the bottom plate (12) being sleeved outside the valve body (1).

7. The dual flow solenoid valve anti-magnetic cover according to claim 1, characterized in that: A tin foil sticker (13) is attached to the outer side of the anti-magnetic cover (4), and an iron sheet (14) is attached to the outer side or the inner side of the tin foil sticker (13).

8. The anti-magnetic cover of a dual-flow solenoid valve according to any one of claims 1 to 7, characterized in that: A through threading hole (15) is provided on the nut (7), a sealing strip is inserted into the threading hole (15), and the sealing strip is wrapped around and tied to the outside of the whole formed by the anti-magnetic cover (4) and the valve body (1).

9. The dual flow solenoid valve anti-magnetic cover according to claim 8, characterized in that: The screw hole of the nut (7) is a blind hole with its opening facing downwards, the threading hole (15) is located at the top of the nut (7) and is spaced apart from the blind hole; and / or, on one of the nut (7), the threading hole (15) is at least two through holes with different length directions.

10. The anti-magnetic cover of a dual-flow solenoid valve according to any one of claims 1 to 7, characterized in that: The valve cores (2) are two valve cores (2) arranged side by side, and the upper ends of the two valve cores (2) are provided with the connecting column (5); the material of the anti-magnetic cover (4) is anti-magnetic steel, and the material of the nut (7) and the connecting column (5) is aluminum alloy.

Images