Self-hold electromagnetic valve

Abstract

The utility model discloses a self-holding electromagnetic valve which comprises an electromagnetic assembly and a valve body assembly. The electromagnetic assembly comprises a coil component, a coil plastic-coated shell and an iron core, and the coil component comprises a coil framework and a coil; a magnet mounting frame is arranged on the outer side surface of the coil framework, and a magnet is placed on the magnet mounting frame; a circuit board is arranged on the coil plastic-coated shell, a circuit board protection cover is arranged outside the circuit board, and a wire used for being connected with an external power source is arranged on the circuit board. The valve body assembly comprises a valve body, a limiting piece and a valve plug component. The valve body is provided with an exhaust channel, an air outlet channel and an air inlet channel. The limiting piece is arranged in the valve body and is close to the electromagnetic assembly. The valve plug part comprises a valve plug rod, a valve plug head and a valve plug spring; one end of the valve plug rod penetrates through the limiting piece to make contact with the iron core. And an exhaust circulation hole is formed in the limiting piece. According to the self-holding electromagnetic valve, through a specific structure, the self-holding electromagnetic valve can be kept in a normally open state for a long time and can also be kept in a normally closed state for a long time during power failure.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a self-holding solenoid valve. Background Art

[0002] A solenoid valve is an industrial device controlled by electromagnetics. It is a fundamental component in automation used to control fluids. It is a control element used to control actuators, not limited to hydraulic or pneumatic types. It is used in industrial control systems to adjust the direction, flow, speed, and other parameters of a medium. Its operating principle is to control the mechanical movement of the valve core by switching the current flowing through the electromagnet, thereby closing and opening various vents to control certain parameters of the fluid entering the mechanical component.

[0003] Common solenoid valves generally have components such as a static iron core and a moving iron core. When the solenoid valve works, it applies current to the excitation coil to generate magnetic force between the static iron core and the moving iron core, which attracts the moving iron core to move toward the static iron core. A valve plug is usually installed at one end of the moving iron core. When the moving iron core moves, it drives the valve plug to move and then block or unblock the valve to control the opening and closing of the valve.

[0004] For example, Chinese patent CN221443383U discloses a high-reliability two-position, two-way solenoid valve, which includes an electromagnetic assembly and a valve body; the electromagnetic assembly includes a coil assembly and an iron core assembly; the coil assembly includes a coil and a coil plastic-coated shell; the iron core assembly includes an electromagnetic sleeve, a moving iron core, a static iron core and a valve plug stem; the valve body is provided with an air outlet channel and an air inlet channel; when power is turned on, one end of the valve plug stem abuts against one end of the air inlet channel; a set of guide rings made of self-lubricating material is provided on the moving iron core, and the guide rings form a sliding secondary structure with the inner wall of the electromagnetic sleeve; the guide rings are provided with grooves for exhausting when the moving iron core moves.

[0005] However, in the above-mentioned prior art, the normally open state when the solenoid valve is powered off and the normally closed state when the solenoid valve is powered off are realized by two solenoid valves with different structures. It is impossible for the same solenoid valve to maintain the normally open state for a long time or switch to the normally closed state for a long time when the power is off. Therefore, when using the above-mentioned solenoid valve, whether it is a normally open type or a normally closed type, it is always necessary to power on for a long time to meet the use requirements when switching. However, long-term power-on will cause the solenoid valve to heat up, affect its service life, and have high energy consumption. Utility Model Content

[0006] To address the shortcomings of the existing technology, the present application provides a self-holding solenoid valve. The self-holding solenoid valve of the present application utilizes a specific structure to maintain both a normally open state and a normally closed state for a long period of time when the power is off. It only needs to be powered on for a period of time during switching, without having to remain powered on for a long period of time. Therefore, the solenoid valve of the present application does not have its service life affected by self-heating, and its energy consumption is low during use, which is beneficial for improving the production efficiency of enterprises.

[0007] The technical solution of this application is:

[0008] A self-holding solenoid valve comprises a matching electromagnetic assembly and a valve body assembly; the electromagnetic assembly comprises a coil component, a coil plastic-coated shell arranged on the periphery of the coil component, and an iron core arranged inside the coil component, the coil component comprising a coil skeleton and a coil; a magnet mounting bracket is provided on the outer surface of the coil skeleton, and a magnet is placed on the magnet mounting bracket; a circuit board is provided on the coil plastic-coated shell, a circuit board protective cover is provided outside the circuit board, the coil plastic-coated shell and the circuit board protective cover are detachably connected, and a wire for connecting an external power supply is provided on the circuit board; the valve body assembly comprises a valve body, a limiter and a valve plug component; an exhaust channel, an air outlet channel and an air inlet channel are sequentially provided on the valve body, and the exhaust channel is located on a side close to the electromagnetic assembly; the limiter is provided inside the valve body and close to the electromagnetic assembly; the valve plug component comprises a valve plug rod, a valve plug head and a valve plug spring arranged in sequence; one end of the valve plug rod passes through the limiter and contacts the iron core; the limiter is provided with an exhaust flow hole, and the exhaust flow hole is connected to the exhaust channel.

[0009] Compared with the prior art, the self-holding solenoid valve of the present application is provided with a magnet on the outer surface of the coil skeleton; when the solenoid valve needs to be opened, the wire on the solenoid valve is connected to the external power supply, and the external power supply supplies power in the forward direction. When the positive current passes through the coil, a magnetic field is generated, pushing the iron core away from the valve body assembly, so that the air inlet channel and the air outlet channel are connected. At this time, the power is disconnected, and the iron core will remain stationary under the action of the magnet, so that the solenoid valve remains in a normally open state; when the solenoid valve needs to be closed, the external power supply supplies power in the reverse direction. When the reverse current passes through the coil, a magnetic field is generated, pushing the iron core close to the valve body assembly, so that the air outlet channel and the exhaust channel are connected. At this time, the power is disconnected, and the iron core will remain stationary under the action of the magnet, so that the solenoid valve remains in a normally closed state; in this way, the solenoid valve can remain in a normally open state or a normally closed state in a power-off state, so that the solenoid valve can remain in a power-off state for a long time when in use, with low energy consumption, which is conducive to improving the production efficiency of the enterprise and can avoid affecting the service life due to self-heating.

[0010] As an optimization, in the aforementioned self-holding solenoid valve, the magnet mounting bracket is located in the middle of the coil bobbin. This structure, with the magnet in the middle of the coil bobbin, allows the magnet to effectively attract the core regardless of whether it is positioned above or below the coil bobbin, thereby improving the reliability of the solenoid valve.

[0011] As an optimization, in the aforementioned self-holding solenoid valve, the iron core is a cylindrical structure with a thick center and thin ends. This structure can ensure that the iron core is firmly attracted by the magnet while reducing its weight and facilitating its up and down movement when powered.

[0012] As an optimization, in the aforementioned self-retaining solenoid valve, the coil bobbin is made of PPS. This material has excellent electrical insulation properties, preventing current leakage and short circuits; it also has high mechanical strength and rigidity, resulting in a long service life.

[0013] As an optimization, in the aforementioned self-retaining solenoid valve, the fitting between the airway opening inside the valve body and the valve plug head is tapered. This structure uses a line contact method for sealing, which ensures sealing while reducing the machining accuracy requirements of the valve plug head contact surface.

[0014] Furthermore, in the aforementioned self-holding solenoid valve, a rubber sealing plug is provided on the valve plug head. In this structure, the rubber sealing plug is provided to replace the valve plug head to seal the airway opening, which has a better sealing effect.

[0015] As an optimization, the maximum clearance between the valve plug and the airway opening inside the valve body of the aforementioned self-retaining solenoid valve is 0.3 to 3 mm. This clearance size was determined to be optimal after extensive experimentation by R&D personnel. This structure not only makes the internal structure of the solenoid valve compact and stable, but also ensures smooth flow inside the valve. It also further shortens the solenoid valve's response time when powering on and off, expanding the solenoid valve's applicability while ensuring accuracy and safety.

[0016] As an optimization, in the aforementioned self-holding solenoid valve, the coil plastic-coated housing is connected to the valve body via a connector. This structural design is simple and easy to produce and assemble.

[0017] As an optimization, the aforementioned self-retaining solenoid valve includes a seal at the airway inlet of the valve body, which connects to external components. This seal at the airway inlet strengthens the seal between the solenoid valve and other components. Furthermore, the seal is replaceable, allowing for individual replacement if damaged, making it convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the self-holding solenoid valve of this application Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the self-holding solenoid valve of this application Figure 2 ;

[0020] Figure 3 is a front cross-sectional view of the self-holding solenoid valve of the present application;

[0021] Figure 4 It is a structural diagram of the limiter in this application;

[0022] Figure 5 It is a partial structural diagram of the valve plug component in this application.

[0023] The marks in the accompanying drawings are: 1-electromagnetic assembly, 11-coil component, 111-coil skeleton, 112-coil, 12-coil plastic shell, 13-iron core, 14-magnet mounting bracket, 15-magnet, 16-circuit board, 17-circuit board protective cover, 18-wire; 2-valve body assembly, 21-valve body, 211-exhaust channel, 212-air outlet channel, 213-air inlet channel, 22-limiting part, 221-exhaust flow hole, 23-valve plug component, 231-valve plug rod, 232-valve plug head, 233-valve plug spring, 234-rubber sealing plug; 3-connecting part; 4-sealing part. DETAILED DESCRIPTION

[0024] The present application is further described below with reference to the accompanying drawings and examples, but is not intended to limit the present application. In the following examples, any content not described in detail or not shown in detail in the accompanying drawings is common knowledge in the art.

[0025] Example (see Figures 1-5 ):

[0026] A self-holding solenoid valve includes a matching electromagnetic assembly 1 and a valve body assembly 2; the electromagnetic assembly 1 includes a coil component 11, a coil plastic shell 12 arranged on the periphery of the coil component 11, and an iron core 13 arranged inside the coil component 11, and the coil component 11 includes a coil skeleton 111 and a coil 112; a magnet mounting bracket 14 is provided on the outer surface of the coil skeleton 111, and a magnet 15 is placed on the magnet mounting bracket 14; a circuit board 16 is provided on the coil plastic shell 12, and a circuit board protective cover 17 is provided outside the circuit board 16, the coil plastic shell 12 and the circuit board protective cover 17 are detachably connected, and the circuit board 16 is provided with a 18; the valve body assembly 2 includes a valve body 21, a limiter 22 and a valve plug assembly 23; the valve body 21 is provided with an exhaust channel 211, an air outlet channel 212 and an air inlet channel 213 in sequence, and the exhaust channel 211 is located on the side close to the electromagnetic assembly 1; the limiter 22 is arranged inside the valve body 21 and close to the electromagnetic assembly 1; the valve plug assembly 23 includes a valve plug rod 231, a valve plug head 232 and a valve plug spring 233 arranged in sequence; one end of the valve plug rod 231 passes through the limiter 22 and contacts the iron core 13; the limiter 22 is provided with an exhaust circulation hole 221, and the exhaust circulation hole 221 is communicated with the exhaust channel 211.

[0027] In this embodiment, the magnet mounting bracket 14 is located in the middle of the coil bobbin 111. With this structure, the magnet 15 is located in the middle of the coil bobbin 111. Regardless of whether the iron core 13 in the coil bobbin 111 is near the top or the bottom, it can be effectively attracted by the magnet 15, thereby improving the reliability of the solenoid valve.

[0028] In this embodiment, the iron core 13 is a cylindrical structure with a thick middle and thin ends. This structure can ensure that the iron core 13 is firmly attracted by the magnet 15, and can also reduce the weight and facilitate the up and down movement when the power is turned on.

[0029] In this embodiment, the material of the coil bobbin 111 is PPS. Using this material as the coil bobbin 111 has excellent electrical insulation properties, can prevent current leakage and short circuit, and has high mechanical strength and rigidity, and a long service life.

[0030] In this embodiment, the fitting area between the airway opening inside the valve body 21 and the valve plug head 232 is tapered. This structure uses a line contact method for sealing, which ensures sealing while reducing the machining accuracy requirements of the contact surface of the valve plug head 232.

[0031] In this embodiment, a rubber sealing plug 234 is provided on the valve plug head 232. In this structure, the rubber sealing plug 234 is provided to replace the valve plug head 232 to seal the airway opening, and the sealing effect is better.

[0032] In this embodiment, the maximum clearance between the valve plug 232 and the airway opening inside the valve body 21 is 2 mm. This clearance is an optimal size determined by R&D personnel after extensive experimentation. This structure not only makes the internal structure of the solenoid valve compact and stable, but also ensures smooth flow inside the valve. It also further shortens the solenoid valve's response time when powering on and off, while ensuring accuracy and safety, and expanding the solenoid valve's applicability.

[0033] In this embodiment, the coil plastic-coated housing 12 is connected to the valve body 21 via a connector 3. This structural design is simple and easy to produce and assemble.

[0034] In this embodiment, a seal 4 is provided at the airway inlet of the valve body 21, which connects to external components. This structure, with the seal 4 at the airway inlet, can enhance the sealing between the solenoid valve and other components. Furthermore, the seal 4 is replaceable, allowing for individual replacement if damaged, making it convenient and efficient.

[0035] When the self-holding solenoid valve of this embodiment is used, the wire 18 on the solenoid valve is connected to the external power supply, and the external power supply is supplied with positive power. When the positive current passes through the coil 112, a magnetic field is generated, which pushes the iron core 13 away from the valve body assembly 2. The valve plug head 232 opens the air inlet channel 213 and closes the exhaust channel 211 under the action of the valve plug spring 233, so that the air inlet channel 213 is connected to the air outlet channel 212. After the power is turned on for 0.5 seconds, the power is disconnected, and the iron core 13 remains motionless under the action of the magnet 15, so that the electric The magnetic valve remains in a normally open state; when the solenoid valve needs to be closed, the external power supply is reversely supplied. When the reverse current passes through the coil 112, a magnetic field is generated, pushing the iron core 13 close to the valve body assembly 2, driving the valve plug stem 231 and the valve plug head 232 to squeeze the valve plug spring 233, opening the exhaust channel 211 and closing the air inlet channel 213, so that the air outlet channel 212 is connected to the exhaust channel 211. After the power is turned on for 0.5 seconds, the power is disconnected, and the iron core 13 will remain motionless under the action of the magnet 15, so that the solenoid valve remains in a normally closed state.

[0036] The above general description of the utility model and the description of its specific embodiments involved in this application should not be understood as limiting the technical solutions of the utility model. Based on the disclosure of this application, those skilled in the art may, without violating the constituent elements of the utility model involved, add, subtract or combine the disclosed technical features in the above general description and / or specific embodiments (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. A self-holding solenoid valve, comprising a solenoid assembly (1) and a valve body assembly (2) arranged in a matching manner; characterized in that: The electromagnetic assembly (1) comprises a coil component (11), a coil plastic-coated shell (12) arranged on the periphery of the coil component (11), and an iron core (13) arranged inside the coil component (11); the coil component (11) comprises a coil skeleton (111) and a coil (112); a magnet mounting frame (14) is provided on the outer surface of the coil skeleton (111), and a magnet (15) is placed on the magnet mounting frame (14); a circuit board (16) is provided on the coil plastic-coated shell (12), a circuit board protective cover (17) is provided outside the circuit board (16), the coil plastic-coated shell (12) and the circuit board protective cover (17) are detachably connected, and a wire (18) for connecting to an external power supply is provided on the circuit board (16); The valve body assembly (2) includes a valve body (21), a limiting member (22) and a valve plug member (23); the valve body (21) is provided with an exhaust channel (211), an exhaust channel (212) and an intake channel (213) in sequence, and the exhaust channel (211) is located on a side close to the electromagnetic assembly (1); the limiting member (22) is arranged inside the valve body (21) and close to the electromagnetic assembly (1); the valve plug member (23) includes a valve plug rod (231), a valve plug head (232) and a valve plug spring (233) arranged in sequence; one end of the valve plug rod (231) passes through the limiting member (22) and contacts the iron core (13); the limiting member (22) is provided with an exhaust circulation hole (221), and the exhaust circulation hole (221) is connected to the exhaust channel (211).

2. The self-holding solenoid valve according to claim 1, characterized in that: The magnet mounting frame (14) is located in the middle portion of the coil frame (111).

3. The self-holding solenoid valve according to claim 2, characterized in that: The iron core (13) is a cylindrical structure with a thick middle and thin ends.

4. The self-holding solenoid valve according to claim 3, characterized in that: The material of the coil frame (111) is PPS.

5. The self-holding solenoid valve according to claim 4, characterized in that: The fitting portion between the airway opening inside the valve body (21) and the valve plug head (232) is tapered.

6. The self-holding solenoid valve according to claim 5, characterized in that: The valve plug head (232) is provided with a rubber sealing plug (234).

7. The self-holding solenoid valve according to claim 6, characterized in that: The maximum gap between the valve plug head (232) and the airway opening inside the valve body (21) is 0.3 to 3 mm.

8. The self-holding solenoid valve according to any one of claims 1 to 7, characterized in that: The coil plastic-coated housing (12) is connected to the valve body (21) via a connecting piece (3).

9. The self-holding solenoid valve according to claim 8, characterized in that: A sealing member (4) is provided at the airway inlet of the valve body (21) connected to the external components.

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