Pilot-operated type medium-high pressure electromagnetic valve

Abstract

The utility model relates to a pilot-operated type medium-high pressure electromagnetic valve which comprises an electromagnet assembly, a valve cover assembly, a valve body and an exhaust part which are sequentially connected from top to bottom, and a valve rod and a reset spring which are arranged in the valve body. An exhaust cavity structure capable of automatically balancing air pressure is additionally arranged at the position of the valve rod, air pressure of the other path is balanced while one path is connected, switching impact is eliminated, action stability is improved, and compared with a traditional direct-acting electromagnetic valve, reliable switching of high-pressure air paths can be achieved without a high-power coil, energy is saved, and the service life of an electromagnet is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of solenoid valves, and in particular to a pilot-operated medium- and high-pressure solenoid valve. Background Technology

[0002] In industrial automation control systems, solenoid valves are a key pneumatic control component, widely used for opening and closing and switching of medium and high pressure gas circuits. Traditional high-pressure solenoid valves mainly rely on electromagnetic force to directly drive the valve stem. Although their structure is simple and easy to assemble, they require a large electromagnetic force under medium and high pressure gas transmission conditions, resulting in high coil power consumption and severe heat generation. At the same time, during the process of switching gas circuits, the air pressure in the non-working chamber cannot be released in time, affecting the sealing effect of the valve stem and reducing the service life of the solenoid valve. Utility Model Content

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a pilot-operated medium-high pressure solenoid valve, comprising an electromagnet assembly, a valve cover assembly, a valve body, and an exhaust component connected sequentially from top to bottom, as well as a valve stem and a return spring disposed within the valve body. The valve body is provided with a mounting groove for accommodating the valve stem, and an upper air inlet, a lower air inlet, a side hole, an upper air outlet, and a lower air outlet communicating with the mounting groove. The valve cover assembly is provided with a pilot hole for communicating with the side hole and the mounting groove. The electromagnet assembly is provided with a moving iron component for controlling the opening and closing of the pilot hole. The air pressure in the side hole controls the movement of the valve stem through the pilot hole. The valve stem is provided with an upper transition chamber, an exhaust chamber, and a lower transition chamber. The upper air outlet communicates with the upper air inlet and the exhaust component through the upper transition chamber and the exhaust chamber, respectively. The upper air outlet communicates with the lower air inlet and the exhaust component through the lower transition chamber and the exhaust chamber, respectively.

[0004] Using the above technical solution, compressed air is simultaneously input from both the upper and lower air inlets. The upper air inlet connects to the pilot hole within the valve cover assembly via a side hole. When the electromagnet assembly is energized, the moving iron retracts, and the side hole connects to the top of the mounting groove via the pilot hole. This increases the air pressure above the valve stem, forcing it to move downwards and compressing the return spring. At this time, the upper air outlet is open, and the lower air outlet is closed. The gas at the upper air outlet is then output through the upper transition chamber. Simultaneously, the lower air outlet connects to the exhaust chamber to balance the air pressure at the lower air outlet. When the electromagnet assembly is not energized, the moving iron abuts against and disconnects the pilot hole, and the valve stem is subjected to the return spring. When the force moves upward, the upper vent is disconnected and the lower vent is connected. The gas at the lower vent is then output through the lower transition chamber. At the same time, the upper vent is connected to the exhaust chamber to balance the air pressure at the upper vent. The electromagnet assembly only needs to control the small flow of gas at the pilot hole to control the valve stem. An exhaust chamber structure for automatically balancing air pressure is added to the valve stem, so that while one path is connected, the air pressure of the other path is balanced, eliminating switching shock and improving the stability of the action. Compared with the traditional direct-acting solenoid valve, it can achieve reliable switching of high-pressure air paths without the need for a high-power coil, saving energy and extending the life of the electromagnet.

[0005] The present invention is further configured such that the valve stem is provided with a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring arranged sequentially from top to bottom, the upper transition cavity is formed between the first sealing ring and the second sealing ring, the exhaust cavity is formed between the second sealing ring and the third sealing ring, and the lower transition cavity is formed between the fourth sealing ring and the fifth sealing ring.

[0006] Using the above technical solution, the valve stem is integrally machined, resulting in high overall structural strength and suitability for mass production. Each sealing ring is fitted with a sealing ring to ensure that the upper transition chamber, exhaust chamber, and lower transition chamber are separated, preventing high-pressure gas from flowing through or leaking.

[0007] The present invention is further configured such that the mounting groove includes an upper sliding groove, a limiting groove, a lower sliding groove, and a switching groove; the first sealing ring is slidably connected to the upper sliding groove; the reset spring is disposed between the limiting groove and the first sealing ring; the second, third, fourth, and fifth sealing rings are slidably connected to the lower sliding groove; and the switching groove is disposed at the lower vent hole, and the switching groove is used to release the seal at the third / fourth sealing ring.

[0008] Furthermore, the limiting groove is provided with a limiting post for restricting the movement of the valve stem, and the reset spring is sleeved on the limiting post.

[0009] Furthermore, the outer diameter of the first sealing ring is larger than that of the second sealing ring, and the outer diameters of the second, third, fourth, and fifth sealing rings are the same.

[0010] Using the above technical solution, the inner diameters of the upper sliding groove, the limiting groove, the switching groove, and the lower sliding groove gradually decrease. When the electromagnet is energized, the high-pressure air pressure pushes the first sealing ring down from the upper sliding groove. The movement range of the first sealing ring is limited by the limiting post to avoid excessive air pressure causing excessive compression of the return spring. The inner diameter of the switching groove is slightly larger than the inner diameter of the lower sliding groove, causing the sealing of the third and fourth sealing rings passing through the switching groove to fail, thus meeting the requirements of airway switching and exhaust.

[0011] The present invention is further configured such that the valve stem has a central hole with an opening facing the exhaust component, and a pressure relief hole connecting the central hole and the exhaust chamber.

[0012] The above technical solution is adopted in which the pressure relief hole and the center hole are perpendicular to each other, which is suitable for drilling. The overall structure is simple and reasonable, and the center hole structure reduces the weight of the valve stem to the greatest extent, reduces the kinetic energy required to drive the valve stem, and improves the transmission efficiency.

[0013] The present invention is further configured such that the valve cover assembly includes a cover body, a sealing element and a partition plate. The cover body is sealed to the partition plate through the sealing element. The cover body and the partition plate are combined to form a pilot hole and an output hole corresponding to the side hole and the mounting groove, respectively. One end of the pilot hole is provided with a boss corresponding to the moving iron part.

[0014] Furthermore, the electromagnet assembly includes a housing, a coil disposed inside the housing, a moving iron component slidably connected to the coil, and a tower-shaped spring for controlling the reset of the moving iron component. The cover has a cylindrical cavity, and the housing is sealed to the cover through the cylindrical cavity. The housing and the cover are combined to form a control cavity that connects the pilot hole and the output hole. The moving iron component is disposed in the control cavity.

[0015] Using the above technical solution, when the coil is energized, the moving iron part moves upward and away from the boss, and the tower-shaped spring is compressed. At this time, the air pressure in the side hole flows into the valve body through the pilot hole, control chamber and output hole in sequence and forces the valve stem. Conversely, when the coil is de-energized, the moving iron part is reset by the action of the tower-shaped spring and disconnects the pilot hole, stopping the action on the valve stem. The overall structure is simple and meets the requirements of solenoid valve control.

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 For the present utility model Figure 2 A stepped sectional view of the A-direction view;

[0020] Figure 4 This is a cross-sectional view of the valve stem of this utility model;

[0021] Figure 5 This is a cross-sectional view of the valve body of this utility model.

[0022] Figure 6 This is an exploded view of the valve cover assembly of this utility model;

[0023] Figure 7 For the present utility model Figure 3 A magnified view of the central B-direction view;

[0024] Figure 8 This is a schematic diagram of gas flow in the electromagnet assembly of this utility model when it is not energized;

[0025] Figure 9 This is a schematic diagram of gas flow in the electromagnet assembly of this utility model under energized conditions;

[0026] Wherein: 1-Electromagnet assembly, 2-Valve cover assembly, 3-Valve body, 4-Exhaust component, 5-Valve stem, 6-Reset spring, 10-Housing shell, 11-Moving iron component, 12-Coil, 13-Tower-shaped spring, 21-Cover, 22-Seal, 23-Baffle, 24-Boss, 25-Cylindrical cavity, 30-Mounting groove, 31-Upper sliding groove, 32-Limiting groove, 33-Lower sliding groove, 34-Switching groove, 35-Limiting post, 51- Upper transition chamber, 52 - exhaust chamber, 53 - lower transition chamber, 54 - first sealing ring, 55 - second sealing ring, 56 - third sealing ring, 57 - fourth sealing ring, 58 - fifth sealing ring, 59 - center hole, 60 - pressure relief hole, 100 - upper air inlet, 110 - lower air inlet, 120 - side hole, 130 - pilot hole, 140 - output hole, 150 - control chamber, 200 - upper air outlet, 210 - lower air outlet; Detailed Implementation

[0027] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0028] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0029] like Figure 1-3As shown, this embodiment provides a pilot-operated medium-high pressure solenoid valve, including an electromagnet assembly 1, a valve cover assembly 2, a valve body 3, and an exhaust component 4 connected sequentially from top to bottom, as well as a valve stem 5 and a return spring 6 disposed within the valve body 3. The valve body 3 is provided with a mounting groove 30 for accommodating the valve stem 5, and an upper air inlet 100, a lower air inlet 110, a side hole 120, an upper air outlet 200, and a lower air outlet 210 communicating with the mounting groove 30. The valve cover assembly 2 is provided with a connection between the side hole 120 and the mounting groove 30. The pilot hole 130 of the electromagnet assembly 1 is provided with a moving iron part 11 for controlling the opening and closing of the pilot hole 130. The air pressure in the side hole 120 controls the movement of the valve stem 5 through the pilot hole 130. The valve stem 5 is provided with an upper transition chamber 51, an exhaust chamber 52 and a lower transition chamber 53. The upper air outlet 200 is connected to the upper air inlet 100 and the exhaust component 4 through the upper transition chamber 51 and the exhaust chamber 52 respectively. The upper air outlet 200 is connected to the lower air inlet 110 and the exhaust component 4 through the lower transition chamber 53 and the exhaust chamber 52 respectively.

[0030] Combination Figure 4 As shown, in this embodiment, the valve stem 5 is provided with a first sealing ring 54, a second sealing ring 55, a third sealing ring 56, a fourth sealing ring 57, and a fifth sealing ring 58 arranged sequentially from top to bottom. An upper transition cavity 51 is formed between the first sealing ring 54 and the second sealing ring 55, an exhaust cavity 52 is formed between the second sealing ring 55 and the third sealing ring 56, and a lower transition cavity 53 is formed between the fourth sealing ring 57 and the fifth sealing ring 58. The valve stem 5 is integrally machined, with high overall structural strength and suitable for mass production. Each sealing ring is fitted with a sealing ring to ensure that the upper transition cavity 51, the exhaust cavity 52, and the lower transition cavity 53 are separated, preventing high-pressure gas from flowing through or leaking.

[0031] Combination Figure 5 As shown, in this embodiment, the mounting groove 30 includes an upper sliding groove 31, a limiting groove 32, a lower sliding groove 33, and a switching groove 34. A first sealing ring 54 is slidably connected to the upper sliding groove 31. A return spring 6 is disposed between the limiting groove 32 and the first sealing ring 54. A second sealing ring 55, a third sealing ring 56, a fourth sealing ring 57, and a fifth sealing ring 58 are slidably connected to the lower sliding groove 33. The switching groove 34 is located at the lower vent 210 and is used to release the seal at the third sealing ring 56 / fourth sealing ring 57. The limiting groove 32 is provided with a limiting post 35 for limiting the movement of the valve stem 5. The return spring 6 is sleeved on the limiting post 35. The outer diameter of the first sealing ring 54 is larger than that of the second sealing ring 55. The outer diameters of the second sealing ring 55, the third sealing ring 56, the fourth sealing ring 57 and the fifth sealing ring 58 are the same. The inner diameters of the upper sliding groove 31, the limiting groove 32, the switching groove 34 and the lower sliding groove 33 gradually decrease. The valve stem 5 is provided with a central hole 59 with an opening facing the exhaust component 4, and a pressure relief hole 60 connecting the central hole 59 and the exhaust chamber 52.

[0032] Combination Figure 6 , 7 As shown, in this embodiment, the valve cover assembly 2 includes a cover body 21, a sealing element 22, and a partition 23. The cover body 21 is sealed to the partition 23 through the sealing element 22. The cover body 21 and the partition 23 are combined to form a pilot hole 130 and an output hole 140 corresponding to the side hole 120 and the mounting groove 30, respectively. One end of the pilot hole 130 is provided with a boss 24 corresponding to the moving iron part 11. The electromagnet assembly 1 includes a housing 10, a coil 12 disposed inside the housing 10, a moving iron part 11 slidably connected inside the coil 12, and a tower-shaped spring 13 for controlling the reset of the moving iron part 11. The cover body 21 is provided with a cylindrical cavity 25. The housing 10 is sealed to the cover body 21 through the cylindrical cavity 25. The housing 10 and the cover body 21 are combined to form a control cavity 150 that connects the pilot hole 130 and the output hole 140. The moving iron part 11 is disposed in the control cavity 150.

[0033] Combination Figure 8 , 9 As shown, the working principle of this utility model is as follows: compressed air is simultaneously input from the upper air inlet 100 and the lower air inlet 110. The air pressure in the upper air inlet 100 flows to the pilot hole 130 through the side hole 120. When the electromagnet assembly 1 is energized, the moving iron part 11 moves upward and away from the boss 24, and the tower spring 13 is compressed. The air pressure in the side hole 120 flows sequentially through the pilot hole 130, the control chamber 150, and the output hole 140 to the top of the upper slide groove 31. The air pressure above the valve stem 5 increases and forces it to move downward, and the return spring 6 is compressed. At this time, the upper air outlet 200 is in the connected state, and the lower air outlet 210 is in the disconnected state. Therefore, the upper air outlet 200... The gas is output from the upper outlet 200 through the upper transition chamber 51. At the same time, the lower outlet 210 is connected to the exhaust chamber 52 to balance the gas pressure at the lower outlet 210. When the electromagnet assembly 1 is not energized, the moving iron part 11 is reset by the tower spring 13 and disconnects the pilot hole 130. The valve stem 5 is moved upward by the force of the reset spring 6. At this time, the upper outlet 200 is in the open state and the lower outlet 210 is in the closed state. Then the gas at the lower outlet 210 is output from the lower outlet 210 through the lower transition chamber 53. At the same time, the upper outlet 200 is connected to the exhaust chamber 52 to balance the gas pressure at the upper outlet 200.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pilot-operated medium-high pressure solenoid valve, characterized in that, The valve body (3) includes an electromagnet assembly (1), a valve cover assembly (2), a valve body (3), and an exhaust component (4) connected sequentially from top to bottom, as well as a valve stem (5) and a return spring (6) located in the valve body (3). The valve body (3) is provided with a mounting groove (30) for accommodating the valve stem (5), and an upper air inlet (100), a lower air inlet (110), a side hole (120), an upper air outlet (200), and a lower air outlet (210) connected to the mounting groove (30). The valve cover assembly (2) is provided with a pilot hole (130) for connecting the side hole (120) and the mounting groove (30). The electromagnet assembly (1) is provided with a moving iron part (11) for controlling the opening and closing of the pilot hole (130). The air pressure in the side hole (120) controls the movement of the valve stem (5) through the pilot hole (130). The valve stem (5) is provided with an upper transition chamber (51), an exhaust chamber (52) and a lower transition chamber (53). The upper air outlet (200) is connected to the upper air inlet (100) and the exhaust component (4) through the upper transition chamber (51) and the exhaust chamber (52), respectively. The upper air outlet (200) is connected to the lower air inlet (110) and the exhaust component (4) through the lower transition chamber (53) and the exhaust chamber (52), respectively.

2. The pilot-operated medium-high pressure solenoid valve according to claim 1, characterized in that: The valve stem (5) is provided with a first sealing ring (54), a second sealing ring (55), a third sealing ring (56), a fourth sealing ring (57) and a fifth sealing ring (58) arranged sequentially from top to bottom. The upper transition cavity (51) is formed between the first sealing ring (54) and the second sealing ring (55), the exhaust cavity (52) is formed between the second sealing ring (55) and the third sealing ring (56), and the lower transition cavity (53) is formed between the fourth sealing ring (57) and the fifth sealing ring (58).

3. A pilot-operated medium-high pressure solenoid valve according to claim 2, characterized in that: The mounting groove (30) includes an upper sliding groove (31), a limiting groove (32), a lower sliding groove (33), and a switching groove (34). The first sealing ring (54) is slidably connected to the upper sliding groove (31). The reset spring (6) is located between the limiting groove (32) and the first sealing ring (54). The second sealing ring (55), the third sealing ring (56), the fourth sealing ring (57), and the fifth sealing ring (58) are slidably connected to the lower sliding groove (33). The switching groove (34) is located at the lower vent (210), and the switching groove (34) is used to release the seal at the third sealing ring (56) / fourth sealing ring (57).

4. A pilot-operated medium-high pressure solenoid valve according to claim 3, characterized in that: The limiting groove (32) is provided with a limiting post (35) for limiting the movement of the valve stem (5), and the reset spring (6) is sleeved on the limiting post (35).

5. A pilot-operated medium-high pressure solenoid valve according to claim 4, characterized in that: The outer diameter of the first sealing ring (54) is larger than that of the second sealing ring (55), and the outer diameters of the second sealing ring (55), the third sealing ring (56), the fourth sealing ring (57) and the fifth sealing ring (58) are the same.

6. A pilot-operated medium-high pressure solenoid valve according to claim 2, characterized in that: The valve stem (5) has a central hole (59) opening toward the exhaust component (4) and a pressure relief hole (60) connecting the central hole (59) and the exhaust chamber (52).

7. A pilot-operated medium-high pressure solenoid valve according to claim 1, characterized in that: The valve cover assembly (2) includes a cover body (21), a seal (22) and a partition (23). The cover body (21) is sealed to the partition (23) through the seal (22). The cover body (21) and the partition (23) are combined to form a pilot hole (130) and an output hole (140) corresponding to the side hole (120) and the mounting groove (30) respectively. One end of the pilot hole (130) is provided with a boss (24) corresponding to the moving iron part (11).

8. A pilot-operated medium-high pressure solenoid valve according to claim 7, characterized in that: The electromagnet assembly (1) includes a housing (10), a coil (12) disposed inside the housing (10), a moving iron (11) slidably connected inside the coil (12), and a tower-shaped spring (13) for controlling the resetting of the moving iron (11). The cover (21) is provided with a cylindrical cavity (25). The housing (10) is sealed to the cover (21) through the cylindrical cavity (25). The housing (10) and the cover (21) together form a control cavity (150) that connects the pilot hole (130) and the output hole (140). The moving iron (11) is disposed inside the control cavity (150).

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