Magnetic reset direct-acting solenoid valve and reset method of moving iron core sealing assembly inside the valve

Abstract

The present invention provides a magnetic reset direct-acting solenoid valve and a reset method for the moving iron core sealing assembly inside the valve. The magnetic reset direct-acting solenoid valve includes: a valve body provided with a flow channel; a moving iron core sealing assembly that is reciprocally and linearly movably installed in the upper part of the valve body of the flow channel, and a sealing structure is provided on the moving iron core sealing assembly to cut off or open the flow channel during the reciprocating linear movement of the moving iron core sealing assembly; a static iron core that is hermetically installed in the upper part of the valve body of the moving iron core sealing assembly; a coil that is wound around the valve body outside the static iron core and the moving iron core sealing assembly, and the upper end of the coil is below the upper end of the static iron core, and the lower end of the coil is above the lower end of the moving iron core sealing assembly; a permanent magnet installed on the upper part of the static iron core, and the lower magnetic pole repels the upper magnetic pole of the moving iron core sealing assembly magnetized by the coil. It is used to solve the problem that the direct-acting solenoid valve cannot be reset in time after the coil is powered off after removing the reset spring, and can meet the special requirements of complex working environments.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic valves, in particular to a magnetic reset direct-acting electromagnetic valve and a reset method of a moving iron core sealing component in the valve. Background Art

[0002] Magnetic reset direct-acting solenoid valves primarily control the flow of fluid by driving a moving iron core with an electromagnet. Currently, they are widely used in refrigeration systems. Power is applied to the coil, generating a magnetic field that creates an electromagnetic force between the moving iron core seal assembly and the stationary iron core, opening the valve and allowing the flow of fluid. When the coil is de-energized, the force of a return spring (a compression spring) resets the moving iron core seal assembly, closing the valve. Therefore, the spring is an essential reset component in existing magnetic reset direct-acting solenoid valves.

[0003] However, in existing refrigeration systems, the medium within a magnetic reset direct-acting solenoid valve is corrosive, pressurized ammonia, with a temperature between -30°C and 200°C. Under these harsh operating conditions, the reset spring is susceptible to stress corrosion, which can even lead to spring breakage. This not only affects the on / off function of the solenoid valve and reduces its lifespan, but also affects the operation of the entire air conditioning unit. However, if the reset spring is removed, the valve core cannot be reset promptly after a power outage, which also affects the normal operation of the entire air conditioning unit. If the reset spring is removed, residual magnetic force still remains between the moving iron core seal assembly and the static iron core after the solenoid valve coil is powered off, preventing the moving iron core seal assembly from being reset promptly, thus preventing the solenoid valve from closing and affecting its normal operation. Therefore, a magnetic reset direct-acting solenoid valve and a reset method for the moving iron core seal assembly within the valve are needed to address the problems of the spring within the existing magnetic reset direct-acting solenoid valve being susceptible to corrosion and damage in harsh operating conditions, while the solenoid valve without the reset spring cannot be reset promptly after the coil loses power. Summary of the Invention

[0004] In view of the above-mentioned defects and shortcomings of the prior art, the present invention provides a reset method for a magnetic reset direct-acting solenoid valve and a moving iron core sealing assembly in the valve, which is used to solve the problem in the prior art that the direct-acting solenoid valve cannot be reset in time after the coil is powered off after the reset spring is removed.

[0005] A first aspect of the present invention is to provide a magnetic reset direct-acting solenoid valve, comprising:

[0006] a valve body, wherein a flow channel is provided on the valve body;

[0007] The moving iron core sealing assembly, the moving iron core sealing assembly can be reciprocally linearly movably installed in the valve body above the flow channel, and a sealing structure is provided on the moving iron core sealing assembly that can cut off or open the flow channel during the reciprocal linear movement of the moving iron core sealing assembly;

[0008] The static iron core, the static iron core is hermetically installed in the valve body above the moving iron core sealing assembly, and a gap is provided between the static iron core and the moving iron core sealing assembly to allow the moving iron core sealing assembly to move to open the flow channel;

[0009] The coil, the coil is wound around the valve body outside the static iron core and the moving iron core sealing assembly, and the upper end of the coil is below the upper end of the static iron core, and the lower end of the coil is above the lower end of the moving iron core sealing assembly;

[0010] The permanent magnet, the permanent magnet is installed on the upper part of the static iron core, and the lower magnetic pole repels the upper magnetic pole of the moving iron core sealing assembly magnetized by the coil.

[0011] As an example of the present invention, a non-magnetic tube is provided on the valve body, and the moving iron core sealing assembly is installed in the non-magnetic tube.

[0012] As an example of the present invention, the non-magnetic tube is detachably installed on the valve body.

[0013] As an example of the present invention, the non-magnetic tube is a thin-walled part with good heat dissipation, and heat dissipation fins are installed outside the non-magnetic tube.

[0014] As an example of the present invention, at least one guiding body matching the installation hole in the valve body is provided on the moving iron core sealing assembly, and the guiding body slides along the inner wall of the installation hole during the reciprocal linear movement of the moving iron core sealing assembly.

[0015] As an example of the present invention, a partition structure for sealingly separating both ends of the flow channel is provided on the valve body, a through hole connecting both ends of the flow channel is provided in the upper part of the partition structure, and the sealing structure on the moving iron core sealing assembly includes a sealing body capable of blocking the through hole.

[0016] As an example of the present invention, the sealing body is fixedly installed at the lower part of the moving iron core and protrudes outside the moving iron core.

[0017] As an example of the present invention, a through installation hole is provided in the moving iron core of the moving iron core sealing assembly, the sealing body is movably installed in the installation hole, and the lower part can extend out of the moving iron core and block the through hole on the partition structure.

[0018] As an example of the present invention, the upper end of the seal body is flush with the upper end of the moving iron core.

[0019] The second aspect of the present invention is to provide a method for resetting the moving iron core in a direct-acting solenoid valve. The solenoid valve includes a valve body, a coil, a stationary iron core, and a moving iron core. The resetting method includes the following process:

[0020] A permanent magnet is provided on the side of the stationary iron core facing away from the moving valve core, and the lower magnetic pole of the permanent magnet repels the upper magnetic pole of the moving iron core magnetized by the solenoid valve coil;

[0021] After the coil loses power, the moving iron core is reset under the repulsive force of the permanent magnet.

[0022] As an example of the present invention, the resetting method further includes: setting the reset direction of the moving iron core vertically downward.

[0023] As an example of the present invention, the moving iron core sealing assembly includes a moving iron core and a seal body. A through installation hole is provided in the moving iron core. The seal body is movably installed in the installation hole, and the lower part can extend out of the moving iron core and block the through hole on the partition structure; the resetting method further includes: making the upper end of the seal body flush with the moving iron core.

[0024] For the magnetic force reset direct-acting solenoid valve and reset method of the present invention, a permanent magnet is provided on the side of the stationary iron core facing away from the moving valve core, and the magnetic pole of the permanent magnet facing the moving iron core repels the magnetic pole of the moving iron core facing the permanent magnet magnetized by the solenoid valve coil; when the coil loses power, the magnetized moving iron core is reset under the repulsion of the permanent magnet. For the magnetic force reset direct-acting solenoid valve and reset method of the present invention, after the coil loses power, the moving valve core can be quickly reset without a reset spring, and the normal on-off of the solenoid valve can also be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as imposing any limitation on the present invention. In the drawings:

[0026] Figure 1 is a schematic structural diagram of an embodiment of the magnetic force reset direct-acting solenoid valve of the present invention;

[0027] Figure 2 is Figure 1 a partial enlarged view of area I in

[0028] Figure 3 is a schematic structural diagram of another embodiment of the magnetic force reset direct-acting solenoid valve of the present invention;

[0029] Figure 4 is Figure 3 the partially enlarged view of Region II in

[0030] Figure 5 the schematic flow chart of an embodiment of the method of the present invention;

[0031] Figure 6 the schematic flow chart of another embodiment of the method of the present invention.

[0032] Reference numerals

[0033] 10 Valve body

[0034] 101 Flow channel

[0035] 1011 First end

[0036] 1012 Second end

[0037] 102 Partition structure

[0038] 103 Through hole

[0039] 1031 Tapered hole

[0040] 104 Non-magnetic tube

[0041] 20 Permanent magnet

[0042] 30 Static iron core

[0043] 40 Sealing structure

[0044] 50 Coil

[0045] 60 Moving iron core sealing assembly

[0046] 610 Moving iron core

[0047] 611 First guide body

[0048] 612 Second guide body

[0049] 620 Sealing body

[0050] 70 Heat sink

[0051] 80 Nut Detailed implementation manners

[0052] The direct-acting solenoid valve mainly controls the on and off of the fluid by the electromagnet pushing the moving iron core. At present, it is widely used in refrigeration systems. By energizing the coil, a magnetic field is generated, so that an electromagnetic force that attracts each other is generated between the moving iron core sealing component and the static iron core in the solenoid valve, opening the solenoid valve and allowing the medium to flow through the solenoid valve; after the coil is powered off, through the spring force of the return spring (compression spring), the moving iron core sealing component is reset to achieve the purpose of closing the valve. Therefore, in the direct-acting solenoid valve, the spring is an essential reset component.

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] As Figures 1 to 4 shown, in an embodiment of the present invention, a magnetic force reset direct-acting solenoid valve is provided, including:

[0055] A valve body 10, on which a flow channel 101 is provided;

[0056] A moving iron core sealing component 60, which is reciprocally and linearly movably installed in the valve body 10 above the flow channel 101, and a sealing structure is provided on the moving iron core sealing component 60 to cut off or open the flow channel 101 during the reciprocal linear movement of the moving iron core sealing component 60;

[0057] A static iron core 30, which is hermetically installed in the valve body 10 above the moving iron core sealing component 60, and a gap is provided between the static iron core 30 and the moving iron core sealing component 60 to allow the moving iron core sealing component 60 to move to open the flow channel 101;

[0058] A coil 50, which is wound around the valve body 10 outside the static iron core 30 and the moving iron core sealing component 60, and the upper end of the coil 50 is below the upper end of the static iron core 30, and the lower end of the coil 50 is above the lower end of the moving iron core sealing component 60;

[0059] A permanent magnet 20, which is installed on the upper part of the static iron core 30, and the lower magnetic pole repels the upper magnetic pole of the moving iron core sealing component 60 magnetized by the coil 50.

[0060] The magnetic reset direct-acting solenoid valve of the present invention is provided with a permanent magnet 20 on one side of the sealed end facing away from the moving iron core 610, and the magnetic pole of the permanent magnet 20 facing the moving iron core 610 repels the magnetic pole of the moving iron core 610 magnetized by the solenoid valve coil 50 facing the permanent magnet 20; when the coil 50 loses power, the magnetized moving iron core 610 is reset under the repulsion of the permanent magnet 20. The magnetic reset direct-acting solenoid valve and the reset method of the present invention can quickly reset the moving valve core without a reset spring after the coil 50 loses power, and can also achieve the purpose of normal on-off of the solenoid valve.

[0061] In order to reduce the magnetization of the valve body 10 under the action of the coil 50 and affect the action accuracy of the moving iron core sealing component 60, in an embodiment of the present invention, a non-magnetic tube 104 is provided on the valve body 10, and the moving iron core sealing component 60 is installed in the non-magnetic tube 104. The non-magnetic tube 104 can be made of any suitable material that will not be magnetized by the coil 50. In an embodiment of the present invention, the non-magnetic tube 104 is non-magnetic 304 stainless steel.

[0062] The installation form of the non-magnetic tube 104 on the valve body 10 may not be limited as long as it can achieve sealed installation. In an embodiment of the present invention, the non-magnetic tube 104 is detachably installed on the valve body 10. The lower part of the non-magnetic tube 104 is threadedly connected and installed on the valve body 10, the lower part of the static iron core 30 is inserted into the upper part of the non-magnetic tube 104, and a sealing structure 40 is provided between the non-magnetic tube 104 and the static magnet. However, in some other embodiments of the present invention, the lower end of the non-magnetic tube 104 is welded to the valve body 10, and the upper end of the non-magnetic tube 104 is welded to the static iron core 30.

[0063] Considering the working temperature of the fluid medium in the valve body 10, in another embodiment of the present invention, the non-magnetic tube 104 is a thin-walled part with good heat dissipation, and a heat sink 70 is installed outside the non-magnetic tube 104. An annular pipe is provided inside the heat sink 70. The annular pipe is sleeved outside the non-magnetic tube 104 and is stopped at the boss on the non-magnetic tube 104 at the lower part. The heat sink 70 reduces the damage caused by high temperature to the non-magnetic tube 104 and the moving iron core 610, thereby extending the service life of the entire solenoid valve.

[0064] In order to increase the working accuracy of the moving iron core sealing component 60, in another embodiment of the present invention, the moving iron core sealing component 60 is provided with a first guide body 611 and a second guide body 612 (at least one) that match the installation hole in the valve body 10, and the guide body slides along the inner wall of the installation hole during the reciprocating linear movement of the moving iron core sealing component 60.

[0065] In the present invention, the manner in which the moving iron core sealing component 60 cuts off or opens the flow channel 101 is not limited, as long as the flow channel 101 can be cut off or opened by the moving iron core sealing component 60. In an embodiment of the present invention, a partition structure 102 for sealingly separating the first end 1011 and the second end 1012 of the flow channel 101 is provided on the valve body 10. A through hole 103 for connecting the two ends of the flow channel 101 is provided in the upper part of the partition structure 102. The sealing structure 40 on the moving iron core sealing component 60 includes a sealing body 620 capable of blocking the through hole 103.

[0066] In principle, the structural form of the moving iron core sealing component 60 in the present invention is not overly limited as long as it can achieve the cutting off and connection of the flow channel 101 during the reciprocating movement. As Figures 1 to 2 shown, in an embodiment of the present invention, the sealing body 620 is fixedly installed at the lower part of the moving iron core 610 and protrudes outside the moving iron core 610. This structure can save processing costs.

[0067] As Figures 3 to 4 shown, in another embodiment of the present invention, a through installation hole is provided in the moving iron core 610 of the moving iron core sealing component 60. The sealing body 620 is movably installed in the installation hole, and the lower part can extend out of the moving iron core 610 and block the through hole 103 on the partition structure 102. This structural form can also set the reset direction of the sealing body 620 vertically downward in the use state. On the one hand, after the coil loses power, the sealing body 620 can be reset under the combined action of the repulsive force of the permanent magnet and the gravity of the sealing body 620. On the other hand, the split design of the moving iron core 610 and the sealing body 620, compared with the Figure 1 integral design in [reference], can reduce the impact force of the sealing body 620 on the tapered hole 1031 during reset, and can effectively increase the service life of the sealing body 620 and the tapered hole 1031.

[0068] In order to facilitate the sealing body and the moving iron core from getting stuck during use, thereby causing the sealing body to get stuck in the moving iron core and unable to move down and reset, in one embodiment of the present invention, the upper end of the sealing body is flush with the upper end of the moving iron core. When the sealing body and the moving iron core are stuck, the coil is energized, and the moving iron core drives the stuck sealing body upward. After moving to the top, the sealing body presses against the static iron core, and the moving iron core continues to move upward under the action of the magnetic force, thus eliminating the blockage. In the present invention, the shape of the position where the through hole 103 and the sealing body 620 cooperate is not limited, as long as a sealing fit can be achieved. In one embodiment of the present invention, a tapered hole 1031 is provided at the upper portion of the through hole 103, and the position where the sealing body 620 cooperates with the tapered hole 1031 is a spherical structure. This cooperation method is conducive to the automatic centering of the ball head of the sealing body 620 in the tapered hole 1031, which can increase the accuracy of the reset action on the one hand and improve the reliability of the seal on the other hand.

[0069] The permanent magnet 20 of the present invention can be installed in various forms. In one embodiment of the present invention, the top end of the static iron core 30 is threadedly connected to a nut 80, and the permanent magnet 20 is installed inside the nut 80. This installation method provides convenience for maintenance.

[0070] The material of the permanent magnet 20 in the present invention can be any suitable material such as natural magnet or artificial magnet, such as neodymium iron boron, samarium cobalt, etc. In one embodiment of the present invention, the permanent magnet 20 is a samarium cobalt magnet, which can provide good magnetic force.

[0071] like Figure 5 As shown, in another embodiment of the present invention, a method for resetting a moving iron core in a direct-acting solenoid valve is provided. The solenoid valve includes a valve body, a coil, a stationary iron core, and a moving iron core sealing assembly. The resetting method includes the following steps:

[0072] A permanent magnet is arranged on the side of the static iron core away from the movable valve core sealing assembly, and the lower magnetic pole of the permanent magnet is made to repel the upper magnetic pole of the movable iron core sealing assembly magnetized by the electromagnetic valve coil;

[0073] After the coil loses power, the moving iron core sealing assembly is reset under the repulsive force of the permanent magnet.

[0074] The reset method of the present invention can quickly reset the movable valve core in the absence of a reset spring after the coil loses power.

[0075] like [[ID=:13]]Figure 6As shown, in another embodiment of the method of the present invention, the reset method also includes: setting the reset direction of the moving iron core vertically downward, and after the coil loses power, the moving iron core is reset under the combined action of the repulsive force of the permanent magnet and the gravity of the moving iron core. When resetting vertically downward, the gravity of the moving iron core itself helps to improve the accuracy of the reset action.

[0076] like Figure 3 As shown, in one embodiment of the method of the present invention, the movable iron core sealing assembly includes a movable iron core and a sealing body. A through-mounting hole is provided in the movable iron core. The sealing body is movably mounted in the mounting hole, and the lower portion can extend out of the movable iron core and seal the through-hole on the partition structure. The resetting method further includes: making the upper end of the sealing body flush with the movable iron core. When the sealing body and the movable iron core are stuck, the coil is energized, and the movable iron core drives the stuck sealing body upward. After moving to the top, the sealing body presses against the static iron core, while the movable iron core continues to move upward under the action of the magnetic force, thereby eliminating the obstruction.

[0077] In summary, the magnetic reset direct-acting solenoid valve and the reset method of the moving iron core sealing assembly in the valve of the present invention are achieved by arranging a permanent magnet on the side of the static iron core away from the moving valve core, and making the magnetic pole of the permanent magnet facing the side of the moving iron core repel the magnetic pole of the moving iron core facing the permanent magnet after being magnetized by the solenoid valve coil; when the coil loses power, the magnetized moving iron core is reset under the repulsion of the permanent magnet. The magnetic reset direct-acting solenoid valve and reset method of the present invention can quickly reset the moving valve core without a reset spring after the coil loses power, and can also achieve the purpose of normal on and off of the solenoid valve. Therefore, the present invention effectively overcomes some practical problems in the prior art and has high utilization value and use significance.

[0078] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A magnetic reset direct-acting solenoid valve, characterized in that: include: a valve body, wherein a flow channel is provided on the valve body; A movable iron core sealing assembly, the movable iron core sealing assembly being mounted in the valve body at the upper portion of the flow channel and capable of reciprocating linear movement, the movable iron core sealing assembly being provided with a sealing structure capable of cutting off or opening the flow channel during the reciprocating linear movement of the movable iron core sealing assembly; a static iron core, the static iron core being sealably mounted in the valve body on the upper portion of the movable iron core sealing assembly, and having a gap between the static iron core and the movable iron core sealing assembly to allow the movable iron core sealing assembly to move to open the flow channel; a coil, the coil being disposed around the valve body outside the static iron core and the movable iron core sealing assembly, with the upper end of the coil being below the upper end of the static iron core and the lower end of the coil being above the lower end of the movable iron core sealing assembly; a permanent magnet, the permanent magnet being mounted on the upper portion of the static iron core, with the lower magnetic pole repelling the upper magnetic pole of the movable iron core sealing assembly after being magnetized by the coil; A non-magnetic tube is provided on the valve body, the moving iron core sealing assembly is installed in the non-magnetic tube, and a heat sink is installed outside the non-magnetic tube; at least one guide body matching the mounting hole in the valve body is provided on the moving iron core sealing assembly, and the guide body slides along the inner wall of the mounting hole during the reciprocating linear movement of the moving iron core sealing assembly.

2. The magnetic reset direct-acting solenoid valve according to claim 1, characterized in that: The valve body is provided with a partition structure for sealing and separating the two ends of the flow channel. A through hole is provided on the upper part of the partition structure for connecting the two ends of the flow channel. The sealing structure on the moving iron core sealing assembly includes a sealing body capable of sealing the through hole.

3. The magnetic reset direct-acting solenoid valve according to claim 2, characterized in that: The sealing body is fixedly mounted on the lower part of the moving iron core and protrudes to the outside of the moving iron core.

4. The magnetic reset direct-acting solenoid valve according to claim 3, characterized in that: A through mounting hole is provided in the moving iron core of the moving iron core sealing assembly. The sealing body can be movably mounted in the mounting hole, and the lower portion can extend out of the moving iron core and seal the through hole on the partition structure.

5. The magnetic reset direct-acting solenoid valve according to claim 4, characterized in that: The upper end of the sealing body is flush with the upper end of the moving iron core.

6. A method for resetting a movable iron core sealing assembly in a direct-acting solenoid valve, wherein the direct-acting solenoid valve comprises a valve body, a coil, a stationary iron core, and a movable iron core sealing assembly, characterized in that: The reset method includes the following steps: A permanent magnet is arranged on the side of the static iron core away from the movable iron core sealing assembly, and the lower magnetic pole of the permanent magnet is made to repel the upper magnetic pole of the movable iron core sealing assembly magnetized by the solenoid valve coil; After the coil loses power, the moving iron core sealing assembly is reset under the repulsive force of the permanent magnet.

7. The reset method according to claim 6, wherein: The reset method further includes: The resetting direction of the movable iron core sealing assembly is set vertically downward.

8. The reset method according to claim 6, wherein: The movable iron core sealing assembly includes a movable iron core and a sealing body, wherein a through mounting hole is provided in the movable iron core, and the sealing body is movably mounted in the mounting hole, and a lower portion of the sealing body can extend out of the movable iron core and seal the through hole on the partition structure; the resetting method further includes: Make the upper end of the sealing body flush with the moving iron core.

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