Valve body structure of electromagnetic valve and control method

Abstract

The valve body structure is characterized in that a water inlet channel, a lower film pad bin and a water outlet channel which are sequentially communicated are formed in a lower valve seat, an upper film pad bin and a valve element through hole are formed in an upper valve seat, and the lower film pad bin corresponds to the upper film pad bin; an outer ring of a film pad module is pressed in the upper valve seat and the lower valve seat, the film pad module is located in a film pad bin defined by the lower film pad bin and the upper film pad bin, a guide sleeve is installed in a valve element through hole, a movable iron core is installed in the guide sleeve in a sliding mode, a flexible block is embedded into the end, facing the film pad module, of the movable iron core, and a reset spring is arranged between the other end of the movable iron core and the fixed iron core. A through hole is formed in the middle of the membrane pad, a balance hole is formed in the membrane pad, the pressure relief block is connected and fixed through an upper pressing piece located above the through hole of the membrane pad and a lower blocking piece located below the through hole, a pressure relief through hole is formed in the pressure relief block, and a flexible block at the end of the movable iron core corresponds to the pressure relief block and can form blocking. The device is simple in structure and stable and reliable in working performance; the wide pressure range of 0-10 MPa is achieved, and large water flow can be output.

Description

Technical Field

[0001] The invention relates to a valve body structure and a control method of a solenoid valve, belonging to the technical field of solenoid valves. Background Art

[0002] Existing mining dust removal solenoid valves are mainly divided into straight-through solenoid valves and membrane pad solenoid valves.

[0003] The straight-through solenoid valve has a simple structure and a fast response speed, such as: CN92209775.5 A straight-opening mine dust-proof solenoid valve particularly suitable for controlling the water flow spray for dust prevention in mines, wherein the valve plug seat (15) and the movable iron core (16) are connected, the sealing sheet (8) is embedded in the valve plug seat (15), and the peripheral flange is engaged, and the valve body (10) is provided with a valve seat (14) at a position corresponding to the valve plug, and the valve seat has a through hole connected to the water outlet (12), and the through hole diameter is ∮4.5mm. When the solenoid valve is not energized, the movable iron core (16) is pressed downward under the action of the compression spring (17), and the valve plug is tightly attached to the through hole on the valve seat to close the valve. When the solenoid valve is energized, due to the electromagnetic effect, the movable iron core (16) overcomes the action of the compression spring (17) and moves upward, driving the valve plug to leave the through hole on the valve seat, thereby opening the valve.

[0004] The straight-through solenoid valve has a high pressure generated by water pressure. If it wants to open normally, it can only reduce the diameter of the drain hole (through hole). The drain hole diameter of the current through-hole valve used underground is less than 5mm, resulting in less water output, and poor sealing when working at low pressure, which is easy to leak, seriously reducing the performance of the product. Due to the limited diameter of the through hole, the water flow control cannot reach a wide pressure state.

[0005] The membrane pad type solenoid valve is mainly developed by our company, such as the structures disclosed in CN201410197380.2, CN201810634814.9, etc. The structure mainly adopts two paths. One path is composed of a water inlet copper column, a water outlet copper column and a through hole on the valve body, which is used to adjust the water pressure above the membrane pad. The other path is a water outlet control structure composed of a membrane pad and a valve body. Under the action of the water pressure below, the membrane pad is lifted upward, and the bottom of the membrane pad is separated from the control outlet on the valve seat, and a large amount of water flows out through this control outlet.

[0006] Although the membrane pad solenoid valve has good sealing performance, the diaphragm is easily damaged, and the aperture of the pressure regulating channel is small, which is easily blocked by sand and gravel in the underground environment, seriously affecting the promotion of the product; and the design of the pressure regulating channel also affects the water pressure adaptability range of the valve.

[0007] According to market research and customer feedback, there is an urgent need for a solenoid valve that has a large flow rate and can work stably within a wide water pressure range. Summary of the invention

[0008] In order to solve the technical problems mentioned in the background technology, the present invention provides a valve body structure of a solenoid valve, including an upper valve seat and a lower valve seat, the upper valve seat and the lower valve seat are connected by bolts, the lower valve seat is provided with an inlet channel, a lower membrane cushion bin and a water outlet channel which are connected in sequence, the upper valve seat is provided with an upper membrane cushion bin and a valve core through hole, the lower membrane cushion bin corresponds to the upper membrane cushion bin, the outer ring of the membrane cushion module is pressed into the upper valve seat and the lower valve seat, and the membrane cushion module is located in the membrane cushion bin surrounded by the lower membrane cushion bin and the upper membrane cushion bin, a guide sleeve is installed in the valve core through hole, The moving iron core is slidably installed in the guide sleeve, and a flexible block is embedded in one end of the moving iron core facing the membrane pad module, and a reset spring is arranged between the other end of the moving iron core and the fixed iron core; the membrane pad module includes a membrane pad, an upper pressure plate, a lower baffle plate and a pressure relief block, a through hole is opened in the middle of the membrane pad, the pressure relief block is connected and fixed by the upper pressure plate located above the through hole of the membrane pad and the lower baffle plate below the through hole, a pressure relief through hole is opened in the pressure relief block, the flexible block at the end of the moving iron core corresponds to the pressure relief block and can form a blockage, a balancing hole is opened on the membrane pad, and the coil is installed outside the core sleeve.

[0009] The above structure can ensure that the inlet diameter of the water outlet channel reaches 14mm, and the pressure relief hole on the pressure relief block can reach a diameter of 4mm, thus meeting the needs of large water flow. The diameter of the balance hole on the membrane pad is 3-5mm, and two are symmetrically arranged with the pressure relief hole as the center, which can quickly achieve water pressure balance above and below the membrane pad, and work normally within the water pressure range of 0-10MPa, meeting the needs of wide pressure.

[0010] The control method of the solenoid valve is as follows: when the coil is not energized, the fixed iron core has no magnetic force, and the moving iron core presses the pressure relief block under the action of its own weight and the reset spring, and the flexible block blocks the pressure relief through hole in the pressure relief block, and at the same time, the bottom of the membrane pad module presses the inlet of the water outlet channel of the lower valve body to form a seal; when the coil is energized, a magnetic field is generated, and the fixed iron core generates suction under the action of the magnetic field, and the moving iron core moves toward the fixed iron core under the action of the suction, the flexible block separates from the pressure relief block, and the pressure relief through hole is connected, at this time, part of the water flows out through the pressure relief through hole, This reduces the water pressure above the membrane pad module in the membrane pad bin. Under the action of the water pressure below, the membrane pad module is lifted upward, the bottom of the membrane pad module is separated from the inlet of the water outlet channel, and water forms a passage to flow out in large quantities. When the coil is powered off, the fixed iron core loses its magnetic force, and the moving iron core falls back to its original position under the action of its own weight and the reset spring. The flexible block seals the pressure relief hole in the pressure relief block and presses the membrane pad module down to the lower valve body. The bottom of the membrane pad module presses the inlet of the water outlet channel of the lower valve body to form a seal, and the solenoid valve is completely sealed.

[0011] The membrane pad is provided with a balancing hole and a pressure relief hole, and the flexible block corresponds to the pressure relief hole, and blocks the pressure relief hole when the coil is not energized; the balancing water inlet hole provided on the membrane pad is used to introduce the water in the water inlet channel into the membrane pad chamber above the membrane pad, forming a water pressure balance above and below the membrane pad. Such a structural design can produce the following advantages: 1. Large water flow: Through the movement of the moving iron core, the water flow balance and the lifting of the membrane pad module, a wide pressure and large water flow outflow is achieved, meeting the high flow demand; 2. Wide pressure adaptation range: Within the water pressure range of 0 to 10 MPa, the solenoid valve can work stably for a long time and has strong adaptability; 3. Simple and stable structure: compact structure, few parts, easy to manufacture and assemble, and stable and reliable operation; 4. Superior performance: greatly improves the performance and application range of the solenoid valve, no longer worrying about mud and sand blocking the pressure relief channel, and the wide pressure and large flow meet the use requirements under various working conditions.

[0012] Compared with the prior art, the beneficial effects of the present invention are: simple structure, stable and reliable working performance; achieving a wide pressure range of 0 to 10 MPa and being able to output a large water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the solenoid valve of the present invention; Figure 2 It is a schematic diagram of the valve body and coil connection structure of the present invention; Figure 3 is a schematic cross-sectional structure diagram of a membrane pad module of the present invention; Figure 4 It is a structural schematic diagram of the membrane pad of the present invention; In the figure: 1. lower valve seat, 11. water inlet channel, 12. lower membrane pad chamber, 13. water outlet channel, 2. upper valve seat, 21. upper membrane pad chamber, 22. valve core through hole, 23. guide sleeve, 3. membrane pad module, 31. membrane pad, 311. balance hole, 32. upper pressure plate, 33. lower baffle plate, 34. pressure relief block, 35. pressure relief through hole, 4. moving iron core, 41. flexible block, 5. reset spring, 6. coil, 7. fixed iron core. DETAILED DESCRIPTION

[0014] like Figure 1 The solenoid valve shown in the figure includes a valve body, a valve shell, a valve cover, an inlet line and other structures. Figure 2 , 3The solenoid valve body structure with wide pressure and large flow rate shown in 4 comprises an upper valve seat 2 and a lower valve seat 1, the upper valve seat 2 is connected to the lower valve seat 1 by bolts, and the lower valve seat 1 is provided with an inlet channel 11, a lower membrane pad chamber 12 and a water outlet channel 13 which are connected in sequence, an upper membrane pad chamber 21 and a valve core through hole 22 are provided in the upper valve seat 2, the lower membrane pad chamber 12 corresponds to the upper membrane pad chamber 21, the outer ring of the membrane pad module 3 is pressed into the upper valve seat 2 and the lower valve seat 1, and the membrane pad module 3 is located in the membrane pad chamber surrounded by the lower membrane pad chamber 12 and the upper membrane pad chamber 21, a guide sleeve 23 is installed in the valve core through hole 22, the moving iron core 4 is slidably installed in the guide sleeve 23, and a flexible block 41 is embedded in one end of the moving iron core 4 facing the membrane pad module 3. In this example, the flexible block 41 is made of polyurethane block, and a reset spring 5 is arranged between the other end of the moving iron core 4 and the fixed iron core 7.

[0015] The membrane pad module 3 includes a membrane pad 31, an upper pressure plate 32, a lower baffle plate 33 and a pressure relief block 34. A through hole is opened in the middle of the membrane pad 31. The pressure relief block 34 is connected and fixed by the upper pressure plate 32 located above the membrane pad through hole and the lower baffle plate 33 below the through hole. A pressure relief through hole 35 is opened in the pressure relief block 34. The aperture of the pressure relief through hole 35 is 4mm. The flexible block 41 at the end of the moving iron core 4 corresponds to the pressure relief block 34 and can form a blockage. A balance hole 311 is opened on the membrane pad 31, and the coil 6 is installed outside the iron core sleeve. The membrane pad module 3 uses the membrane pad 31, the upper pressure plate 32, the lower baffle plate 33, and the pressure relief block 34 to string together and then fix them together by riveting with a riveting machine. A protruding ring is set at the inlet of the water outlet channel 13 of the lower valve seat of the membrane pad 31. This ring is in close contact with the lower valve seat 1 under the action of water pressure, and plays the role of an O-ring to achieve complete sealing.

[0016] The inlet diameter of the water outlet channel 13 is 14mm, the diameter of the balance hole on the membrane pad is 3-5mm, and two are symmetrically arranged with the pressure relief hole as the center, which can quickly achieve water pressure balance above and below the membrane pad and work normally within the water pressure range of 0-10MPa.

[0017] The holes opened on the membrane pad 31 are used to balance the water pressure above and below the membrane pad 3, which solves the complex process of the membrane pad type solenoid valve on the market that requires a pilot circuit. For example, the pilot circuit needs to add loop holes to the upper and lower valve bodies. Since the valve body limits the diameter of the loop hole, which is generally not too large, the inner wall of the loop hole cannot be surface treated and is prone to rust. When the water flows, large particles of sediment will cause the pilot circuit to be blocked, causing the solenoid valve to fail to work properly. Two symmetrical through holes are set on the membrane pad 31, which can act as a pilot circuit to balance the upper and lower water pressures of the membrane pad when the membrane pad is completely sealed.

[0018] The pressure relief block 34 should be made of stainless steel, with a pressure relief hole in the center for water to flow through. The boss designed on the top of the pressure relief block 34 can seal with the rubber at the bottom of the moving iron core 4. The upper pressing plate 32 and the lower baffle 33 can ensure the long-term stable operation of the membrane pad module when they are fixed by riveting.

[0019] The structure of the lower valve seat 1 and the upper valve seat 2 saves the complex holes of the pilot circuit compared to the valve seat valve body of the traditional pilot circuit, and the structure is simple and stable, which greatly improves the performance and application range of the product. This structure solves the problems of insufficient water flow of the straight-through solenoid valve in the prior art and the limited water pressure adaptability range of the membrane pad type solenoid valve.

[0020] When the coil 6 is energized to generate a magnetic field, the fixed iron core 7 above the upper valve seat generates suction under the action of the magnetic field, and the moving iron core 4 moves upward under the action of the suction and separates from the pressure relief through hole 35 of the pressure relief block 34 of the membrane pad module 3. At this time, part of the water flows out through the pressure relief through hole 35 in the membrane pad module 3, the water pressure above the membrane pad module 3 decreases, and the membrane pad module 3 is lifted upward under the action of the water pressure below, and the bottom of the membrane pad module 3 is separated from the inlet of the water outlet channel 13 on the lower valve seat 1, and the water flows out through the water inlet channel 11, the lower membrane pad chamber 12 and the water outlet channel 13 on the lower valve seat 1 to form a large flow channel. When the coil 6 is powered off, the fixed iron core 7 loses its magnetic force, and the moving iron core 4 falls back to its original position under the action of its own weight and the reset spring 5. The pressure relief hole 35 of the membrane pad module 3 is blocked. At the same time, the moving iron core 4 presses the membrane pad module 3 down onto the lower valve body 1. The bottom of the membrane pad module 3 presses the inlet of the water outlet channel 13 of the lower valve body 1 to form a seal, and the water flow channel disappears.

[0021] The solenoid valve of this embodiment solves the problems of insufficient water flow of the straight-through solenoid valve in the prior art and the limited water pressure adaptability range of the membrane pad type solenoid valve. It has a simple and stable structure and greatly improves the performance and application range of the product.

Claims

1. A solenoid valve body structure, comprising an upper valve seat and a lower valve seat, wherein the upper valve seat and the lower valve seat are connected by bolts, characterized in that: The lower valve seat is provided with an inlet channel, a lower membrane pad chamber and a water outlet channel which are connected in sequence, the upper valve seat is provided with an upper membrane pad chamber and a valve core through hole, the lower membrane pad chamber and the upper membrane pad chamber correspond to each other, the outer ring of the membrane pad module is pressed into the upper valve seat and the lower valve seat, and the membrane pad module is located in the membrane pad chamber surrounded by the lower membrane pad chamber and the upper membrane pad chamber, a guide sleeve is installed in the valve core through hole, the moving iron core is slidably installed in the guide sleeve, a flexible block is embedded in the end of the moving iron core facing the membrane pad module, and a reset spring is arranged between the other end of the moving iron core and the fixed iron core; the membrane pad module includes a membrane pad, an upper pressing plate, a lower baffle plate and a pressure relief block, a through hole is opened in the middle part of the membrane pad, the pressure relief block is connected and fixed by the upper pressing plate located above the membrane pad through hole and the lower baffle plate below the through hole, a pressure relief through hole is opened in the pressure relief block, the flexible block at the end of the moving iron core corresponds to the pressure relief block and can form a seal, a balancing hole is opened on the membrane pad, and the coil is installed outside the iron core sleeve.

2. The valve body structure of the solenoid valve according to claim 1, characterized in that: The inlet diameter of the water outlet channel is ≤14mm, and the diameter of the pressure relief hole on the pressure relief block is ≤4mm.

3. The valve body structure of the solenoid valve according to claim 1, characterized in that: The membrane pad is provided with a raised ring on the membrane pad body facing the inlet of the water outlet channel of the lower valve seat. The ring is in close contact with the valve seat body at the inlet of the water outlet channel of the lower valve seat under the action of water pressure to seal the inlet of the water outlet channel.

4. The valve body structure of the solenoid valve according to claim 1, characterized in that: The pressure relief block is made of stainless steel, and one end of the pressure relief block facing the moving iron core is arranged as a boss, and the boss cooperates with the flexible block at the bottom of the moving iron core to seal the pressure relief through hole.

5. The valve body structure of the solenoid valve according to claim 1, characterized in that: The balancing holes on the membrane pad shown have a diameter of 3 to 5 mm.

6. The control method of the solenoid valve according to claim 1, characterized in that: When the coil is not energized, the fixed iron core has no magnetic force, and the moving iron core presses the pressure relief block under the action of its own weight and the reset spring, and the flexible block blocks the pressure relief through hole in the pressure relief block. At the same time, the bottom of the membrane pad module presses the inlet of the water outlet channel of the lower valve body to form a seal; when the coil is energized, a magnetic field is generated, and the fixed iron core generates suction under the action of the magnetic field. The moving iron core moves toward the fixed iron core under the action of the suction, the flexible block separates from the pressure relief block, and the pressure relief through hole is connected. At this time, part of the water flows out through the pressure relief through hole, causing the membrane pad chamber to The water pressure above the inner membrane pad module becomes smaller, and under the action of the water pressure below, the membrane pad module is lifted upward, the bottom of the membrane pad module is separated from the inlet of the water outlet channel, and the water forms a passage for large outflow; when the coil is powered off, the fixed iron core loses its magnetic force, and the moving iron core falls back to its original position under the action of its own weight and the reset spring, and the flexible block blocks the pressure relief through hole in the pressure relief block, and at the same time presses the membrane pad module down to the lower valve body, and the bottom of the membrane pad module presses the inlet of the water outlet channel of the lower valve body to form a seal, and the solenoid valve is completely sealed.

Images