A pneumatic shut-off valve quick-closing device

Abstract

This utility model discloses a pneumatic shut-off valve quick-closing device, relating to the field of pneumatic valve technology. Its purpose is to achieve rapid shut-off of the pneumatic shut-off valve through simple modification and low cost. The proposed technical solution includes: a two-position five-way solenoid valve; a pneumatic through-hole ball valve, including a two-position five-way solenoid valve with ports P, A, B, R, and S; the pneumatic through-hole ball valve includes a cylinder and a valve body, the cylinder having a piston chamber and a spring chamber; port P is connected to a compressed air source via an air source pipe, port B is connected to the air inlet of the piston chamber via a first air pipe, and a second air pipe is also included, connecting port A of the two-position five-way solenoid valve and the air inlet of the spring chamber respectively. This utility model shortens the valve closing time, solves the problem of material accumulation and spring aging fatigue causing failure to close completely, extends the valve's service life, and improves production stability.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic valve technology, specifically to a pneumatic shut-off valve quick-closing device. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, lithium carbonate, as a core cathode material for lithium batteries, has seen its hydrometallurgical process become the mainstream production route. This process typically involves key steps such as ore acid hydrolysis, purification, and evaporation crystallization, requiring extensive use of pneumatic shut-off valves for rapid opening and closing of the slurry pipelines. Statistics show that a lithium carbonate production line with an annual capacity of 50,000 tons requires more than 1,000 pneumatic shut-off valves, over 90% of which are single-acting spring-reset designs. These valves rely on a pre-compressed spring within the cylinder to provide fail-safe power.

[0003] However, traditional O-type ball valves face severe challenges under complex slurry media conditions: First, the lithium carbonate precursor slurry has a solid content as high as 20-40% and contains crystalline substances such as lithium sulfate and sodium sulfate, which easily accumulate on the valve seat sealing surface during valve operation intervals, forming hard scale. Second, the reciprocating motion of the valve stem's dynamic sealing area generates a "pumping effect," causing the solid slurry to penetrate into the stuffing box, resulting in a significant increase in valve stem movement resistance. Although the inside of the spring cavity does not directly contact the medium, the local negative pressure created by the viscous slurry in the valve body flow channel causes medium particles to seep back into the cylinder through the valve stem seal, mixing with the lubricating grease to form a gel-like substance that adheres to the spring surface.

[0004] The aforementioned problems directly lead to deterioration in valve closing performance: under normal operating conditions, valve closure takes 500ms, but after slurry accumulation, the closing time can be delayed to over 2000ms, resulting in valve closure lag. While increasing the size of the cylinder and spring can achieve rapid closure, it further increases costs and requires more installation space. Therefore, achieving rapid valve closure at a lower cost is a pressing issue that needs to be addressed. Utility Model Content

[0005] This utility model provides a pneumatic shut-off valve quick-closing device, the purpose of which is to achieve rapid shut-off of the pneumatic shut-off valve through simple modification and low cost.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A pneumatic shut-off valve quick-closing device, comprising:

[0008] It includes a two-position five-way solenoid valve with ports P, A, B, R, and S; and a pneumatic through-hole ball valve, including a cylinder and a valve body located at the bottom of the cylinder. The cylinder has a piston chamber and a spring chamber. Port P is connected to a compressed air source through an air source pipe, and port B is connected to the air inlet of the piston chamber through a first air pipe. It also includes a second air pipe, which is connected to port A of the two-position five-way solenoid valve and the air inlet of the spring chamber, respectively.

[0009] Furthermore, the air tube is a polyurethane flexible tube with a pressure resistance of ≥0.8MPa and an inner diameter of 4-6mm.

[0010] Furthermore, the compressed air pressure at the air inlet of the spring chamber is set to 0.4-0.6 MPa.

[0011] This utility model has the following beneficial effects:

[0012] This invention utilizes a two-position five-way solenoid valve integrated into the pneumatic shut-off valve body to achieve rapid shut-off. By removing the plug from the two-position five-way solenoid valve (normally, a single-acting cylinder only uses one port, with the other blocked), and connecting a pneumatic supply pipe to the P port on the cylinder spring side, the valve is shut off using the combined force of spring torque and pneumatic pressure. This solves the problem of valves not closing completely, significantly shortening the valve closing time, resolving issues caused by material accumulation and spring fatigue leading to incomplete closure, extending valve lifespan, and improving production stability. This device adds virtually no cost. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the pneumatic shut-off valve quick-closing device of this utility model;

[0014] Figure 2 This is a schematic diagram showing the energized state of a two-position five-way solenoid valve.

[0015] Figure 3 This is a schematic diagram of the de-energized state of a two-position five-way solenoid valve.

[0016] Figures 1 to 3 The reference numerals in the attached figures represent: two-position five-way solenoid valve 1, P port 11, A port 12, B port 13, R port 14, S port 15, pneumatic through-hole ball valve 2, cylinder 21, valve body 22, piston chamber 211, spring chamber 212, spring 213, left pressure regulating orifice plate 214, right pressure regulating orifice plate 215, first air pipe 31, second air pipe 32, air source pipe 33, compressed air source 4. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Please refer to Figure 1-3This utility model relates to a pneumatic shut-off valve quick-closing device in the field of pneumatic control, and is particularly suitable for emergency shut-off conditions in industrial pipeline systems. The core of this device lies in optimizing the connection logic between a two-position five-way solenoid valve and a pneumatic through-hole ball valve to achieve a rapid response to valve closing actions.

[0019] The device includes a two-position five-way solenoid valve 1 with a P port 11, an A port 12, a B port 13, an R port 14, and an S port 15; a pneumatic through-hole ball valve 2, including a cylinder 21 and a valve body 22 located at the bottom of the cylinder 21. The cylinder 21 has a piston chamber 211 and a spring chamber 212. The P port 11 is connected to a compressed air source 4 through an air source pipe 33, and the B port 13 is connected to the air inlet of the piston chamber 211 through a first air pipe 31. The device also includes a second air pipe 32, which is connected to the A port 12 of the two-position five-way solenoid valve 1 and the air inlet of the spring chamber 212, respectively.

[0020] The two-position five-way solenoid valve 1 is equipped with five functional air circuit interfaces: P port 11 is connected to compressed air source 4 (working pressure range 0.4-1.0MPa) through air source pipe 33; A port 12 and B port 13 are used as control airflow output terminals respectively; R port 14 and S port 15 are connected to the atmospheric environment through a silencer. The pneumatic through-hole ball valve 2 adopts an O-type ball structure. The cylinder 21 is divided into two independent air chambers, piston chamber 211 and spring chamber 212, by the piston. The spring chamber 212 has a left pressure regulating orifice plate 214 at the air inlet end, and the piston chamber 211 has a right pressure regulating orifice plate 215 at the air inlet end. Both the left pressure regulating orifice plate 214 and the right pressure regulating orifice plate 215 have throttling orifices with a diameter of 1.2mm to control the air intake rate.

[0021] Using the second air pipe 32, connect port A 12 to the air inlet of spring chamber 212. The combined action of spring 213 and gas pushes the piston inside spring chamber 212, closing the pneumatic through-hole ball valve 2. Port B 13 connects to the air inlet of piston chamber 211 via the first air pipe 31, pushing the piston inside piston chamber 211 to open the valve. At this time, the solenoid valve's operating logic is as follows: When the coil of the two-position five-way solenoid valve 1 is energized (e.g.... Figure 2 As shown), P port 11 and B port 13 are connected to supply air to piston chamber 211 through the first air pipe 31, pushing the piston on the side of piston chamber 211 to compress spring 213. The O-shaped ball rotates the valve body 22 to open the valve. At the same time, A port 12 and R port 14 are connected to exhaust the gas in spring chamber 212 through A port 12 to R port 14. The coil of the two-position five-way solenoid valve 1 is de-energized momentarily (e.g. Figure 3As shown, port P11 switches to be connected to port A12, and compressed air is rapidly injected into the spring chamber 212 through the second air pipe 32. At the same time, port B13 and port S15 are connected, allowing the piston chamber 211 to exhaust and release pressure through the first air pipe 31 via port B13 to port S15. During this process, the accelerated inflation of the spring chamber 212 and the rapid exhaust of the piston chamber 211 create a synergistic effect, enabling the spring 213 to quickly complete the valve closing action with the assistance of the compressed gas.

[0022] Air hose 3 is a polyurethane flexible hose with a pressure resistance of ≥0.8MPa and an inner diameter of 4-6mm. Air hose 3 is a reinforced hose made of polyurethane substrate, with a four-layer braided structure including an inner antistatic lining, a double-helix steel wire reinforcement layer, and an outer wear-resistant layer. The hose inner diameter is 4-6mm, preferably 5±0.2mm, with a wall thickness of 1.5mm and a burst pressure ≥3.2MPa. The pressure resistance of this air hose is set at a working pressure of ≥0.8MPa, and the minimum bending radius is 40mm to adapt to complex installation environments.

[0023] The compressed air pressure at the inlet of spring chamber 212 is set to 0.4-0.6 MPa. To prevent over-compression of spring 213 leading to plastic deformation, the inlet pressure of spring chamber 212 needs to be precisely controlled within the range of 0.4-0.6 MPa. This parameter is achieved through a pressure regulating valve installed on the compressed air source 4 pipeline, with a 0.6 MPa safety relief valve at the outlet. The lower pressure limit of 0.4 MPa ensures that the static friction of the seals can be overcome, while the upper pressure limit of 0.6 MPa prevents over-compression of spring 213 from causing plastic deformation.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic shut-off valve quick-closing device, comprising a two-position five-way solenoid valve (1) having a P port (11), an A port (12), a B port (13), an R port (14), and an S port (15); a pneumatic through-hole ball valve (2) comprising a cylinder (21) and a valve body (22) disposed at the bottom of the cylinder (21), wherein the cylinder (21) has a piston chamber (211) and a spring chamber (212); the P port (11) is connected to a compressed air source (4) via an air source pipe (33), and the B port (13) is connected to the air inlet of the piston chamber (211) via a first air pipe (31), characterized in that, It also includes a second air pipe (32), which is connected to the A port (12) of the two-position five-way solenoid valve (1) and the air inlet of the spring chamber (212).

2. The pneumatic shut-off valve quick-closing device according to claim 1, characterized in that, The air tube (3) is a polyurethane hose with a pressure resistance of ≥0.8MPa and an inner diameter of 4-6mm.

3. The pneumatic shut-off valve quick-closing device according to claim 1, characterized in that, The compressed air pressure at the air inlet of the spring chamber (212) is set to 0.4-0.6 MPa.

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