Anti-explosion proportional valve

Abstract

An explosion-proof proportional valve comprises an electromagnetic valve and a circuit board electrically connected with the electromagnetic valve, and further comprises an explosion-proof shell, the explosion-proof shell comprises a first explosion-proof shell with a first explosion-proof cavity and a second explosion-proof shell which is fixedly connected with the first explosion-proof shell and provided with a second explosion-proof cavity, the electromagnetic valve is arranged in the first explosion-proof cavity, and the circuit board is electrically connected with the electromagnetic valve. And the circuit board is arranged in the second explosion-proof cavity. According to the explosion-proof proportional valve controlled by the circuit board, the electromagnetic valve and the circuit board are respectively arranged in the corresponding explosion-proof cavities for explosion-proof treatment, so that the mutual influence is reduced, the explosion-proof effect of the explosion-proof proportional valve with better integrity is achieved, and the explosion-proof proportional valve is convenient to maintain.

Description

Technical Field

[0001] This utility model belongs to the field of explosion protection, and specifically relates to an explosion-proof proportional valve. Background Technology

[0002] Electrical equipment used in environments with explosive gases, dust, and fibers (such as coal mines, petrochemical plants, gas stations, natural gas extraction, drilling platforms, military industries, mines, and metal polishing workshops with explosive hazards) requires explosion-proof design. Otherwise, electrical sparks, arcs, or other electrical ignition sources generated by accidental equipment operation may lead to explosions and safety accidents.

[0003] Proportional valves are available on the market with and without circuit boards. The circuit board plays a crucial role in proportional valves, providing not only the necessary power supply but also amplifying and processing the signal to ensure the valve accurately responds to changes in the control signal. However, currently, most explosion-proof proportional valves on the market are those without circuit boards.

[0004] Therefore, there is a market demand for an explosion-proof proportional valve with circuit board control that is highly explosion-proof and suitable for use in explosion-proof areas. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an explosion-proof proportional valve.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an explosion-proof proportional valve, including a solenoid valve, a circuit board electrically connected to the solenoid valve, and an explosion-proof housing. The explosion-proof housing includes a first explosion-proof housing having a first explosion-proof cavity and a second explosion-proof housing fixedly connected to the first explosion-proof housing having a second explosion-proof cavity. The solenoid valve is disposed in the first explosion-proof cavity, and the circuit board is disposed in the second explosion-proof cavity.

[0007] In some embodiments, a wire-passing hole is provided on the shell wall between the first explosion-proof cavity and the second explosion-proof cavity for passing through wires.

[0008] In some embodiments, the wire hole is encapsulated.

[0009] In some embodiments, the explosion-proof enclosure has a wall thickness of 5mm-10mm.

[0010] In some embodiments, the first explosion-proof housing includes an explosion-proof cylinder, an explosion-proof seal installed inside one end of the explosion-proof cylinder and sleeved on the solenoid valve, and an explosion-proof seal installed inside the pressure sleeve. The push rod of the solenoid valve extends outward through the explosion-proof surface and is inserted into the bushing.

[0011] In some embodiments, the first explosion-proof enclosure further includes a cylinder side cover that is explosion-proofly and sealed at the other end of the explosion-proof cylinder, and an explosion-proof plug is installed on the cylinder side cover by an explosion-proof thread.

[0012] In some embodiments, the second explosion-proof enclosure includes an adapter plate that is sealed and fixed to the explosion-proof cylinder wall via a planar explosion-proof mating surface, an explosion-proof upper shell that is sealed and fixed to the adapter plate via a planar explosion-proof mating surface, and the circuit board is fixed to the inner top surface of the explosion-proof upper shell.

[0013] In some embodiments, the explosion-proof upper housing is equipped with a cable sealing joint for introducing electrical wires.

[0014] In some embodiments, at least one explosion-proof plug is installed on the explosion-proof upper shell.

[0015] In some embodiments, the explosion-proof proportional valve further includes an external mechanical structure controlled by the push rod, the external mechanical structure including a mechanical housing sealed and fixed to one end face of the explosion-proof cylinder, the mechanical housing also pressing on the pressure sleeve and the bushing.

[0016] The scope of this utility model is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model provides an explosion-proof proportional valve with circuit board control. The solenoid valve and the circuit board are respectively set in the corresponding explosion-proof cavity for explosion-proof treatment, reducing mutual interference and achieving a better overall explosion-proof effect for the explosion-proof proportional valve, and it is also convenient for maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front of an explosion-proof proportional valve;

[0019] Figure 2 This is a front sectional view of an explosion-proof proportional valve;

[0020] Figure 3 For the appendix Figure 2 MM-direction cross-section;

[0021] Figure 4 For the appendix Figure 2 NN-direction cross-section;

[0022] The components are: 1. Solenoid valve; 11. Top rod; 2. Circuit board; 3. First explosion-proof enclosure; 31. Explosion-proof cylinder; 32. Pressure sleeve; 33. Bushing; 34. Cylinder side cover; 35. Side cover explosion-proof plug; 4. Second explosion-proof enclosure; 41. Adapter plate; 42. Explosion-proof upper shell; 43. Cable sealing joint; 44. Upper shell explosion-proof plug; 5. External mechanical structure; 51. Mechanical housing; A1. First explosion-proof cavity; A2. Second explosion-proof cavity; A3. Cable passage hole. Detailed Implementation

[0023] As attached Figure 2 As shown, an explosion-proof proportional valve includes a solenoid valve 1 and a circuit board 2 electrically connected to the solenoid valve 1.

[0024] It also includes an explosion-proof enclosure, including a first explosion-proof enclosure 3 having a first explosion-proof cavity A1, and a second explosion-proof enclosure 4 having a second explosion-proof cavity A2 fixedly connected to the first explosion-proof enclosure 3.

[0025] Solenoid valve 1 is disposed within the first explosion-proof cavity A1 of the first explosion-proof enclosure 3. The first explosion-proof enclosure 3 includes an explosion-proof cylinder 31, a pressure sleeve 32 which is installed inside one end of the explosion-proof cylinder 31 and fitted onto the solenoid valve 1 through an explosion-proof mating surface, and a bushing 33 which is installed inside the pressure sleeve 32 through an explosion-proof mating surface and a sealing ring. The push rod 11 of the solenoid valve 1 extends outward after passing through the bushing 33 and engaging with the explosion-proof mating surface. The first explosion-proof enclosure 3 also includes a cylinder side cover 34 which is sealed to the other end of the explosion-proof cylinder 31 through an explosion-proof mating surface and a sealing ring. An explosion-proof plug 35 is installed on the cylinder side cover 34 through an explosion-proof thread. By opening the explosion-proof plug 35, the solenoid valve 1 can be individually repaired and replaced.

[0026] Circuit board 2 is disposed within the second explosion-proof cavity A2. The second explosion-proof enclosure 4 includes an adapter plate 41 fixed to the wall of the explosion-proof cylinder 31 by screws through a planar explosion-proof mating surface and sealing strip, and an explosion-proof upper shell 42 covered by a planar explosion-proof mating surface and fixed to the adapter plate 41 by multiple screws. Circuit board 2 is fixed to the top surface inside the explosion-proof upper shell 42. The explosion-proof upper shell 42 is removed from the adapter plate 41 to facilitate the individual maintenance and replacement of circuit board 2. A cable sealing connector 43 for introducing the cable connected to circuit board 2 is installed on the explosion-proof upper shell 42. Three explosion-proof plugs 44 are also installed on the explosion-proof upper shell 42 by explosion-proof threads for cable sealing connectors for connecting other control cables, etc.

[0027] Design of wire passage hole A3: A wire passage hole A3 is provided on the shell wall between the first explosion-proof cavity A1 and the second explosion-proof cavity A2, that is, on the shell wall of the explosion-proof cylinder 31 and the adjacent adapter plate 41, so that the wire can be connected to the solenoid valve 1 and the circuit board 2.

[0028] After the wire passes through the hole A3, the hole can be sealed, but the sealing conditions must be met. Specifically, the wall thickness of the explosion-proof cylinder 31 and the adjacent transition plate 41 must reach 20mm to ensure that the first explosion-proof cavity A1 and the second explosion-proof cavity A2 form completely independent sealed cavities, preventing pressure overlap between the two cavities. However, sealed wires are inconvenient to replace and maintain. Therefore, in this embodiment, the hole A3 is not sealed; instead, the wall thickness of the entire explosion-proof outer shell is increased to 5mm-10mm. Increasing the wall thickness helps to resist pressure overlap between the two explosion-proof cavities.

[0029] The explosion-proof proportional valve also includes an external mechanical structure 5 controlled by the push rod 11. The external mechanical structure 5 includes a mechanical housing 51 sealed and fixed to one end face of the explosion-proof cylinder 31, and the mechanical housing 51 is also pressed against the pressure sleeve 32 and the bushing 33. After the push rod 11 of the solenoid valve 1 extends outward through the explosion-proof surface and passes through the bushing 33, it extends into the external mechanical structure 5 and connects to form a purely mechanical working structure.

[0030] The explosion-proof proportional valve provided by this utility model has a simple structure. The solenoid valve and circuit board are respectively placed in corresponding explosion-proof chambers for explosion-proof treatment, reducing mutual interference and achieving a good overall explosion-proof effect. It also facilitates maintenance, meets Ex db IIB T6 Gb requirements, has an IP66 explosion-proof rating, and can be used with a rated voltage up to DC24V. It can be used in ambient temperatures ranging from -20℃ to +40℃. Before assembly, the explosion-proof surfaces and threads should be evenly coated with anti-rust oil, and protective measures should be taken.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An explosion-proof proportional valve, comprising a solenoid valve (1) and a circuit board (2) electrically connected to the solenoid valve (1), characterized in that... It also includes an explosion-proof housing, which includes a first explosion-proof housing (3) having a first explosion-proof cavity (A1) and a second explosion-proof housing (4) fixedly connected to the first explosion-proof housing (3) having a second explosion-proof cavity (A2). The solenoid valve (1) is disposed in the first explosion-proof cavity (A1) and the circuit board (2) is disposed in the second explosion-proof cavity (A2).

2. The explosion-proof proportional valve according to claim 1, characterized in that: The shell wall between the first explosion-proof chamber (A1) and the second explosion-proof chamber (A2) is provided with a wire-passing hole (A3) for passing through wires.

3. The explosion-proof proportional valve according to claim 2, characterized in that: The wire hole (A3) is encapsulated.

4. The explosion-proof proportional valve according to claim 2, characterized in that: The explosion-proof enclosure has a wall thickness of 5mm-10mm.

5. The explosion-proof proportional valve according to claim 1, characterized in that: The first explosion-proof housing (3) includes an explosion-proof cylinder (31), an explosion-proof seal installed inside one end of the explosion-proof cylinder (31) and sleeved on the solenoid valve (1), and an explosion-proof seal installed inside the sleeve (32). The push rod (11) of the solenoid valve (1) extends outward through the sleeve (33) by fitting the explosion-proof surface.

6. The explosion-proof proportional valve according to claim 5, characterized in that: The first explosion-proof enclosure (3) also includes a cylinder side cover (34) installed at the other end of the explosion-proof cylinder (31) with an explosion-proof seal. The cylinder side cover (34) is equipped with a side cover explosion-proof plug (35) through an explosion-proof thread.

7. The explosion-proof proportional valve according to claim 5, characterized in that: The second explosion-proof shell (4) includes a transition plate (41) fixed to the shell wall of the explosion-proof cylinder (31) through a plane explosion-proof mating surface, and an explosion-proof upper shell (42) fixed to the transition plate (41) through a plane explosion-proof mating surface, and the circuit board (2) is fixed to the inner top surface of the explosion-proof upper shell (42).

8. The explosion-proof proportional valve according to claim 7, characterized in that: The explosion-proof upper shell (42) is equipped with a cable sealing joint (43) for introducing electrical wires.

9. The explosion-proof proportional valve according to claim 7, characterized in that: At least one explosion-proof plug (44) is installed on the explosion-proof upper shell (42).

10. The explosion-proof proportional valve according to claim 5, characterized in that: The explosion-proof proportional valve also includes an external mechanical structure (5) controlled by the top rod (11). The external mechanical structure (5) includes a mechanical housing (51) sealed and fixed on one end face of the explosion-proof cylinder (31). The mechanical housing (51) is also pressed on the pressure sleeve (32) and the bushing (33).

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