Normally closed electromagnetic valve with self-protection function

Abstract

The invention relates to the technical field of electromagnetic valves, and discloses a normally-closed electromagnetic valve with a self-protection function, which comprises a valve body, a mounting groove is formed in the valve body, an automatic alarm module is mounted in the mounting groove, a cover plate is arranged at the notch position of the mounting groove, the water inlet end and the water outlet end of the valve body are connected with annular pressure reduction bags, and the annular pressure reduction bags are connected with the valve body. Sliding rings are fixed to the ends, away from each other, of the two annular pressure reduction bags. An alarm signal can be automatically sent to a maintainer when the valve body is overpressure, abnormal conditions can be timely notified and handled, meanwhile, the pressure reducing assembly arranged at the water inlet end can overcome the elasticity of the pressurizing spring to enable the pressure relief block to move when the pressure of a medium in the valve body is too large, the medium is discharged through the pressure relief opening and enters the annular pressure reducing bag, automatic and timely pressure relief is achieved, and the working efficiency is improved. The valve body is prevented from being damaged by high pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, in particular to a normally closed solenoid valve with a self-protection function. Background Art

[0002] A normally closed solenoid valve is an automatic control element that automatically closes the fluid channel when the power is off.

[0003] After searching, the Chinese patent with the announcement number CN222717581U discloses a new type of solenoid valve, including a solenoid valve body, an electronic control module is fixedly installed on the side of the solenoid valve body, the lower end of the solenoid valve body is fixedly connected to the switch seat, the lower end of the switch seat is fixedly connected to the valve body joint, the valve body joint is fixedly connected to the valve body, a valve core is slidably arranged in the solenoid valve body, the valve core slides through the switch seat and the valve body joint, the lower part of the valve core is integrally provided with an inner concave step, the lower end of the inner concave step is fixedly provided with an end head, the end head is fixedly connected to the valve disc, the valve disc descends and blocks the passage of the valve body, a manual rotary switch for driving the valve core to rise is provided on the side of the switch seat, the manual rotary switch includes a sealed bearing, a rotating shaft is provided through the sealed bearing, the left end of the rotating shaft is fixedly connected to the knob, and the right end of the rotating shaft is integrally provided with a semicircular boss. The above scheme realizes the valve body opening and closing by electric drive lifting, and the valve core can also be manually lifted and lowered by rotating the switch and the spring to realize manual valve body opening and closing, thereby avoiding the situation where the solenoid valve cannot operate normally in an emergency. However, the above scheme still has the following shortcomings in actual use:

[0004] The solenoid valve proposed in the above scheme does not have the function of overpressure protection. When the pipeline pressure suddenly rises due to a fault or operational error and exceeds the rated pressure range of the solenoid valve, the valve body may be deformed or even ruptured due to internal stress concentration, resulting in medium leakage. If the medium is a high-temperature, corrosive or flammable and explosive fluid, the leakage may further cause equipment damage, environmental pollution or secondary disasters such as fire and explosion. At the same time, continuous overpressure will accelerate the fatigue aging of key components such as the valve seat seal and spring, shorten the service life of the solenoid valve, and increase maintenance costs. In the automated control system, the failure of the solenoid valve caused by overpressure may also cause linkage failure of upstream and downstream equipment, resulting in interruption of the entire process, affecting production efficiency and bringing economic losses.

[0005] Therefore, it is necessary to design a normally closed solenoid valve with self-protection function to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a normally closed solenoid valve with a self-protection function.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A normally closed solenoid valve with a self-protection function comprises a valve body, a mounting slot being provided on the valve body, an automatic alarm module being installed in the mounting slot, a cover being provided at the notch of the mounting slot, an annular decompression bag being connected to the water inlet and outlet ends of the valve body, and a sliding ring being fixed to each of the two annular decompression bags at ends away from each other;

[0009] The water inlet end of the valve body is provided with a pressure reducing assembly, and the pressure reducing assembly includes a pressure reducing cylinder, which is fixed on the valve body and communicated with the interior of the valve body. The pressure reducing cylinder is communicated with the annular pressure reducing bag through a pressure relief pipe. A fixing frame is fixed inside the pressure reducing cylinder, and a pressure relief port is provided on the fixing frame. A slidable pressure relief block is provided on the fixing frame, and the pressure relief block is arranged opposite to the pressure relief port. A movable plate is slidably provided on the fixing frame, and the pressure relief block and the movable plate are connected by a pressure-boosting spring.

[0010] As a preferred technical solution of the present invention, a pressure adjusting assembly is provided on the pressure reducing cylinder, and the adjusting assembly includes an adjusting screw. A threaded opening is provided on the top surface of the pressure reducing cylinder, and the adjusting screw is threadedly sleeved in the threaded opening. An adjusting column is fixed to the bottom end of the adjusting screw, and the adjusting column is arranged opposite to the movable plate.

[0011] As a preferred technical solution of the present invention, a rollable ball is provided at the bottom end of the adjusting column.

[0012] As a preferred technical solution of the present invention, a position feedback component is provided on the valve body, and the position feedback component is used to feedback the position of the valve in an overpressure situation. The position feedback component is composed of a feedback structure, a pulling structure and a damping structure.

[0013] As a preferred technical solution of the present invention, the feedback structure includes a mounting box, which is fixed on the valve body, and a first opening is provided on the top surface of the mounting box. A mounting bracket is fixed on the side of the mounting box, and a trigger switch is installed on the mounting bracket. The trigger switch is electrically connected to the automatic alarm module, and a hole is provided on the side of the mounting box, and the hole is arranged opposite to the trigger switch. A sliding block is provided inside the mounting box for sliding, and the sliding block is connected to the mounting box by a connecting spring. A slot is provided on the top surface of the sliding block, and a light-emitting wick is installed in the slot. A push rod is fixed on the side of the sliding block, and the push rod is arranged opposite to the hole.

[0014] As a preferred technical solution of the present invention, the side surface of the sliding block is in contact with the inner surface of the installation box.

[0015] As a preferred technical solution of the present invention, the pulling structure includes a rotating shaft, which is rotatably installed on the top surface of the sliding block. A sliding opening is provided on the top surface of the installation box, and the sliding opening is connected to the first opening. The rotating shaft is placed in the sliding opening. A winding wheel is fixed on the rotating shaft, and a pull rope is wound on the winding wheel. The end of the pull rope away from the winding wheel is connected to the sliding ring facing the water inlet end of the valve body.

[0016] As a preferred technical solution of the present invention, the damping structure includes two damping parts arranged opposite to each other, each of the damping parts includes a horizontal plate, the horizontal plate is connected to the valve body by a connecting rod, a groove is opened on the side of the horizontal plate, a slidable pressure plate is arranged in the groove, the pressure plate and the groove are connected by an arc-shaped spring sheet, and under the elastic force of the spring sheet, the pressure plate always has a tendency to move out of the groove.

[0017] As a preferred technical solution of the present invention, the side surface of the pressing plate is provided with anti-slip grooves.

[0018] As a preferred technical solution of the present invention, an outer cover is fixed on the valve body, a second opening is provided on the outer cover, the second opening is arranged opposite to the first opening, and an avoidance opening adapted to the pull rope is provided on the outer cover.

[0019] The present invention has the following beneficial effects:

[0020] 1. An automatic alarm module is installed in the valve body installation slot, which can automatically send an alarm signal to the maintenance personnel when the valve body is over-pressurized, and promptly notify and deal with abnormal situations. At the same time, the pressure reducing assembly installed at the water inlet end can overcome the elastic force of the booster spring to move the pressure relief block when the medium pressure inside the valve body is too high, allowing the medium to be discharged through the pressure relief port and into the annular pressure relief bag, realizing automatic and timely pressure relief, preventing the valve body from being damaged by high pressure, extending the service life of the valve body, and ensuring safe and stable operation of the system;

[0021] 2. The pressure regulating assembly on the pressure reducing cylinder can adjust the pressure-boosting spring by rotating the adjusting screw to move the adjusting column according to the actual use of the valve body, thereby changing the position of the movable plate. This allows for flexible and precise adjustment of the pressure threshold of the pressure relief block, meeting the diverse requirements for valve body pressure relief pressure under different working conditions and effectively improving the valve body's adaptability to various complex environments.

[0022] 3. The pulling structure and the damping structure work together. When the valve body is depressurized, the sliding ring pulls the pull rope to drive the rotating shaft to move. When the sliding block moves to the position facing the first opening and the rotating shaft is out of the clamping area of ​​the pressure plate, the pull rope drives the winding wheel to rotate the rotating shaft. At this time, the luminous wick is facing the first opening, and the light shines through to remind the staff, so that the staff can quickly lock the abnormal valve and improve the efficiency of troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structure of the normally closed solenoid valve with self-protection function proposed by the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the normally closed solenoid valve with self-protection function proposed by the present invention is shown in FIG. Figure 2 ;

[0025] Figure 3 It is a structural diagram of the valve body and automatic alarm module;

[0026] Figure 4 It is a schematic diagram of the explosion structure of the decompression component;

[0027] Figure 5 It is a structural diagram of the position feedback component;

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure of the position feedback component;

[0029] Figure 7 is a schematic diagram of the cross-sectional structure of the damping structure;

[0030] Figure 8 for Figure 7 A magnified view of the structure at point A.

[0031] In the figure: 1. valve body; 11. mounting groove; 12. automatic alarm module; 13. cover plate; 2. annular pressure reducing bag; 3. sliding ring; 41. pressure reducing cylinder; 42. pressure relief pipe; 43. fixing frame; 44. pressure relief port; 45. pressure relief block; 46. movable plate; 47. booster spring; 51. adjusting screw; 52. adjusting column; 53. ball; 61. mounting box; 610. sliding port; 611. first opening; 613. mounting frame; 614. trigger switch; 62. sliding block; 63. slot; 64. light wick; 65. push rod; 66. connecting spring; 71. rotating shaft; 72. winding wheel; 73. pull rope; 81. horizontal plate; 811. connecting rod; 82. groove; 83. spring; 84. pressure plate; 91. outer cover; 92. second opening. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-8, a normally closed solenoid valve with a self-protection function includes a valve body 1, a mounting groove 11 is provided on the valve body 1, and an automatic alarm module 12 is installed in the mounting groove 11. The automatic alarm module 12 is used to automatically send an alarm signal to relevant personnel who maintain the valve, so that the staff can deal with the overpressure situation of the valve in time. The specific structure and working principle of the automatic alarm module 12 are prior art, which are not shown in the figure and will not be described in detail here. A cover plate 13 is provided at the notch position of the mounting groove 11 for covering the automatic alarm module 12. The valve body 1 has a water inlet end and a water outlet end. The water inlet end and the water outlet end of the valve body 1 are both connected to an annular decompression bag 2, and the two annular decompression bags 2 are fixed with a sliding ring 3 at one end away from each other. When installing the valve body 1, the staff will respectively sleeve the two sliding rings 3 on the two pipes, and then connect the two pipes to the water inlet end and the water outlet end of the valve body 1 respectively. After the connection is completed, the two annular decompression bags 2 are respectively sleeved on the pipes at both ends of the valve body 1;

[0034] The water inlet end of the valve body 1 is provided with a pressure reducing assembly, which includes a pressure reducing cylinder 41. The pressure reducing cylinder 41 is fixed on the valve body 1 and is connected to the interior of the valve body 1. The pressure reducing cylinder 41 is connected to the annular pressure reducing bag 2 through a pressure relief pipe 42. A fixing frame 43 is fixed to the interior of the pressure reducing cylinder 41. A pressure relief port 44 is provided on the fixing frame 43. A slidable pressure relief block 45 is provided on the fixing frame 43. The pressure relief block 45 is arranged opposite to the pressure relief port 44. A movable plate 46 is slidably provided on the fixing frame 43. The pressure relief block 45 and the movable plate 46 are connected by a pressure boosting spring 47. In the initial state, under the elastic force of the pressure boosting spring 47, the pressure relief block 45 is in a state of blocking the pressure relief port 44. At this time, the medium in the valve body 1 cannot pass The pressure relief port 44 is discharged, and the valve body 1 performs a normal flow control function. When the pressure of the medium inside the valve body 1 is too high, the pressure can overcome the elastic force applied by the pressure-boosting spring 47 to the pressure relief block 45, causing the pressure relief block 45 to move and no longer block the pressure relief port 44. In this case, the medium in the valve body 1 can be discharged through the pressure relief port 44 and enter the pressure-reducing cylinder 41. Furthermore, the medium can be filled into the annular pressure-reducing bag 2 through the pressure relief pipe 42. This design can reduce the high pressure inside the valve body 1, thereby ensuring that the valve body 1 stably performs the flow control function under normal pressure, and can automatically and timely relieve pressure when the pressure rises abnormally, thereby preventing the valve body 1 from being damaged by high pressure, extending the service life of the valve body 1, and ensuring safe and stable operation of the system.

[0035] The pressure reducing cylinder 41 is provided with a pressure regulating assembly, which can adjust the pressure of the boosting spring 47 applied to the pressure relief block 45 according to the actual use of the valve body 1. The regulating assembly includes an adjusting screw 51. The top surface of the pressure reducing cylinder 41 is provided with a threaded opening, and the regulating screw 51 is threadedly sleeved in the threaded opening. The bottom end of the regulating screw 51 is fixed with an regulating column 52, and the regulating column 52 is arranged opposite to the movable plate 46. For the regulating assembly, the staff can adjust the pressure increasing spring 47 by rotating the regulating screw 51. When the regulating screw 51 rotates, the regulating column 52 can be driven to move. When the regulating column 52 moves downward, the regulating column 52 can press the movable plate 46 downward, so that the movable plate 46 moves downward, and the movable plate 46 can squeeze when it moves downward. The booster spring 47 is compressed and deformed. In this case, the booster spring 47 will provide greater elastic force for the pressure relief block 45, and the pressure threshold of the pressure relief block 45 will increase. Similarly, when the adjusting screw 51 drives the adjusting column 52 to move upward, the movable plate 46 will move upward under the elastic force of the booster spring 47. At this time, the booster spring 47 extends under the action of its own elastic force, and the elastic force provided by the booster spring 47 to the pressure relief block 45 becomes smaller, and the pressure threshold of the pressure relief block 45 is reduced. This design can flexibly and accurately adjust the pressure threshold of the pressure relief block 45 according to the actual use of the valve body 1, meet the diverse requirements of the pressure relief pressure of the valve body 1 under different working conditions, and effectively improve the adaptability of the valve body 1 to various complex environments.

[0036] Furthermore, a rolling ball 53 is provided at the bottom end of the adjustment column 52. The design of the ball 53 can reduce the friction between the adjustment column 52 and the movable plate 46.

[0037] A position feedback component is provided on the valve body 1, and the position feedback component is used to feedback the position of the valve in the event of overpressure. The position feedback component is composed of a feedback structure, a pulling structure and a damping structure. The feedback structure includes a mounting box 61, which is fixed on the valve body 1. A first opening 611 is provided on the top surface of the mounting box 61. A mounting bracket 613 is fixed on the side of the mounting box 61. A trigger switch 614 is installed on the mounting bracket 613. The trigger switch 614 is electrically connected to the automatic alarm module 12. The side of the mounting box 61 is provided with a The hole is positioned opposite to the trigger switch 614. A sliding block 62 is slidably provided inside the installation box 61. The sliding block 62 is connected to the installation box 61 via a connecting spring 66. A slot 63 is provided on the top surface of the sliding block 62. A light wick 64 is installed in the slot 63. A push rod 65 is fixed on the side of the sliding block 62, and the push rod 65 is positioned opposite to the hole. In the initial state, the sliding block 62 and the first opening 611 are offset from each other. At this time, the light emitted by the light wick 64 cannot be emitted through the first opening 611.

[0038] The pulling structure includes a rotating shaft 71, which is rotatably mounted on the top surface of the sliding block 62. The top surface of the mounting box 61 is provided with a sliding opening 610, which is connected to the first opening 611. The rotating shaft 71 is placed in the sliding opening 610. A winding wheel 72 is fixedly sleeved on the rotating shaft 71, and a pull rope 73 is wound around the winding wheel 72. The end of the pull rope 73 away from the winding wheel 72 is connected to the sliding ring 3 facing the water inlet end of the valve body 1.

[0039] The damping structure includes two damping members arranged opposite to each other, each of which includes a transverse plate 81, which is connected to the valve body 1 by a connecting rod 811, and a groove 82 is provided on the side of the transverse plate 81. A slidable pressure plate 84 is provided in the groove 82, and the pressure plate 84 is connected to the groove 82 by an arc-shaped spring piece 83. Under the elastic force of the spring piece 83, the pressure plate 84 always has a tendency to move toward the outside of the groove 82. For the rotating shaft 71, the rotating shaft 71 is located between the two pressure plates 84. At this time, the two pressure plates 84 jointly clamp the rotating shaft 71. Under the clamping force of the two pressure plates 84, the rotating shaft 71 cannot rotate. Only when the rotating shaft 71 is separated from the two pressure plates 84 can the rotating shaft 71 rotate freely. When the valve body 1 enters During the pressure relief operation, the medium in the valve body 1 enters the annular decompression bag 2, causing the annular decompression bag 2 to expand. When the annular decompression bag 2 expands, the sliding ring 3 moves and pulls the pull rope 73. Since the rotating shaft 71 is located between the two pressure plates 84 in the initial state, the pulling action of the pull rope 73 cannot rotate the rotating shaft 71, but directly pulls the rotating shaft 71 to move. When the rotating shaft 71 is pulled, the rotating shaft 71 can drive the sliding block 62 to move. When the sliding block 62 moves to a position facing the first opening 611, the rotating shaft 71 just moves out of the area between the two pressure plates 84. At this time, the two pressure plates 84 no longer provide friction to the rotating shaft 71. The pulling of the pull rope 73 drives the winding wheel 72 to rotate, thereby rotating the rotating shaft 71.

[0040] When the luminous lamp 64 is facing the first opening 611, the light it emits can be transmitted from the first opening 611. The light emitted by the luminous lamp 64 can serve as a reminder to the staff, so that the staff can quickly lock the abnormal valve, thereby improving the efficiency of troubleshooting. In addition, when the sliding block 62 moves to the position facing the first opening 611, the push rod 65 can pass through the hole and press the trigger switch 614, so that the trigger switch 614 sends a control signal to the automatic alarm module 12, thereby causing the automatic alarm module 12 to send a warning signal to the relevant maintenance personnel, so that the maintenance personnel can deal with the overpressure of the valve in a timely manner.

[0041] An outer cover 91 is fixed to the valve body 1 . A second opening 92 is formed on the outer cover 91 . The second opening 92 is arranged opposite to the first opening 611 . The outer cover 91 can protect the installation box 61 and the structure thereon.

[0042] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A normally closed solenoid valve with self-protection function, characterized in that: The valve body (1) comprises a valve body (1), a mounting groove (11) is provided on the valve body (1), an automatic alarm module (12) is installed in the mounting groove (11), a cover plate (13) is provided at the notch position of the mounting groove (11), the water inlet end and the water outlet end of the valve body (1) are both connected to an annular decompression bag (2), and a sliding ring (3) is fixed to the ends of the two annular decompression bags (2) that are away from each other; The water inlet end of the valve body (1) is provided with a decompression assembly, and the decompression assembly includes a decompression cylinder (41), the decompression cylinder (41) is fixed on the valve body (1) and is connected to the interior of the valve body (1), the decompression cylinder (41) and the annular decompression bag (2) are connected through a pressure relief pipe (42), a fixing frame (43) is fixed inside the decompression cylinder (41), a pressure relief port (44) is provided on the fixing frame (43), a slidable pressure relief block (45) is provided on the fixing frame (43), the pressure relief block (45) is arranged opposite to the pressure relief port (44), a movable plate (46) is slidably provided on the fixing frame (43), and the pressure relief block (45) and the movable plate (46) are connected through a pressure-increasing spring (47).

2. The normally closed solenoid valve with self-protection function according to claim 1, characterized in that: The decompression cylinder (41) is provided with a pressure regulating assembly, and the regulating assembly includes an regulating screw (51). A threaded opening is provided on the top surface of the decompression cylinder (41), and the regulating screw (51) is threadedly sleeved in the threaded opening. An regulating column (52) is fixed to the bottom end of the regulating screw (51), and the regulating column (52) is arranged opposite to the movable plate (46).

3. The normally closed solenoid valve with self-protection function according to claim 2, characterized in that: A rollable ball (53) is provided at the bottom end of the adjusting column (52).

4. The normally closed solenoid valve with self-protection function according to any one of claims 1 to 3, characterized in that: The valve body (1) is provided with a position feedback component, which is used to feedback the position of the valve in an overpressure situation. The position feedback component is composed of a feedback structure, a pulling structure and a damping structure.

5. The normally closed solenoid valve with self-protection function according to claim 4, characterized in that: The feedback structure includes a mounting box (61), which is fixed on the valve body (1). A first opening (611) is provided on the top surface of the mounting box (61). A mounting bracket (613) is fixed on the side of the mounting box (61). A trigger switch (614) is installed on the mounting bracket (613). The trigger switch (614) is electrically connected to the automatic alarm module (12). A hole is provided on the side of the mounting box (61), and the hole is arranged opposite to the trigger switch (614). A sliding block (62) is provided inside the mounting box (61) for sliding. The sliding block (62) is connected to the mounting box (61) through a connecting spring (66). A slot (63) is provided on the top surface of the sliding block (62), and a light wick (64) is installed in the slot (63). A push rod (65) is fixed on the side of the sliding block (62), and the push rod (65) is arranged opposite to the hole.

6. The normally closed solenoid valve with self-protection function according to claim 5, characterized in that: The side surface of the sliding block (62) is in contact with the inner surface of the installation box (61).

7. The normally closed solenoid valve with self-protection function according to claim 5, characterized in that: The pulling structure includes a rotating shaft (71), the rotating shaft (71) is rotatably mounted on the top surface of the sliding block (62), the top surface of the installation box (61) is provided with a sliding opening (610), and the sliding opening (610) is communicated with the first opening (611), the rotating shaft (71) is placed in the sliding opening (610), a winding wheel (72) is fixedly sleeved on the rotating shaft (71), a pull rope (73) is wound on the winding wheel (72), and the end of the pull rope (73) away from the winding wheel (72) is connected to the sliding ring (3) facing the water inlet end of the valve body (1).

8. The normally closed solenoid valve with self-protection function according to claim 7, characterized in that: The damping structure includes two damping members arranged opposite to each other, each of the damping members includes a transverse plate (81), the transverse plate (81) is connected to the valve body (1) via a connecting rod (811), a groove (82) is provided on the side of the transverse plate (81), a slidable pressure plate (84) is provided in the groove (82), the pressure plate (84) and the groove (82) are connected by an arc-shaped spring sheet (83), and under the elastic force of the spring sheet (83), the pressure plate (84) always has a tendency to move out of the groove (82).

9. The normally closed solenoid valve with self-protection function according to claim 8, characterized in that: The side surface of the pressing plate (84) is provided with anti-slip grooves.

10. The normally closed solenoid valve with self-protection function according to claim 7, characterized in that: An outer cover (91) is fixed on the valve body (1), a second opening (92) is provided on the outer cover (91), the second opening (92) is arranged opposite to the first opening (611), and an escape opening adapted to the pull rope (73) is provided on the outer cover (91).

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