Stop type pneumatic reversing valve

Abstract

The utility model discloses a cut-off type pneumatic reversing valve, which belongs to the technical field of valve devices, and is characterized in that two ends of a valve core are respectively connected with a connecting rod, the connecting rod is connected with a power cylinder, the power cylinder comprises a cylinder body, a piston and a sleeve, the cylinder body is provided with a cavity, the piston is arranged in the cavity of the cylinder body, and the sleeve is connected with the valve core. The outer wall of the piston is attached to the inner wall of the cavity of the cylinder body, and air guide holes are formed in the outer end wall and the inner end wall of the cylinder body respectively. A guide through hole is formed in the inner end wall of the cylinder body, a through hole is formed in the circle center of the piston, one end of the sleeve is inserted into the through hole in the circle center of the piston, and the connecting rod is connected with the guide cylinder through a connecting mechanism. Compared with the prior art, the pressure difference between the liquid inlet and the liquid outlet of the cut-off end is ensured to be stable.

Description

Technical Field

[0001] The utility model relates to the technical field of valve devices, in particular to a cut-off pneumatic reversing valve. Background Art

[0002] In chemical production, precise control of material flow within pipelines is crucial. This goes beyond simple material delivery and, more importantly, ensures the safety, stability, and efficiency of the entire production process. Specifically, strict control of material flow direction, velocity, and pressure is required to ensure smooth production and consistent product quality.

[0003] When the flow direction of materials needs to be controlled, a directional valve such as a solenoid ball valve or butterfly valve is generally used. These valves can effectively control the flow of materials by changing the opening and closing state of the channel to meet the different needs of the production process.

[0004] However, in practical applications, material properties and process conditions often place higher demands on valve selection and use. For example, when materials are highly viscous or pressures are high, ball valves are preferred due to their excellent sealing and pressure resistance. However, due to the operating mode of ball valves, whether solenoid or pneumatic, they typically have a long switching time. This means that in situations requiring rapid response, such as emergency shutdowns or rapid process changes, ball valves may not meet the requirements, thus affecting production efficiency and safety.

[0005] Furthermore, when the material contains a large amount of filler, the operation of the reversing valve can cause significant wear and tear on the seals. This is because during the reversing process, friction and compression occur between the ball valve and the seals, causing wear and damage to the seals. Especially when the material flow rate is high, the moment the ball valve opens, the filler carried by the material will impact the seals at an extremely high speed, causing fatal damage. This damage not only causes seal failure but can also lead to safety issues such as leakage, seriously impacting chemical production. Summary of the Invention

[0006] The purpose of the utility model is to provide a cut-off pneumatic reversing valve to address the above deficiencies in the prior art and to achieve the purpose of ensuring a stable pressure difference between the liquid inlet and the liquid outlet at the cut-off end.

[0007] The utility model provides a cut-off pneumatic reversing valve, comprising a power cylinder and a reversing valve, the reversing valve comprising a valve body and a valve core, a liquid exchange chamber is provided inside the valve body, the liquid exchange chamber comprises a middle liquid exchange chamber and two side liquid exchange chambers, the middle liquid exchange chamber is connected to the two side liquid exchange chambers through connecting holes, the upper end of the valve body is provided with a first liquid pipe which is connected to the middle liquid exchange chamber, the lower end is provided with two symmetrically arranged second liquid pipes, the lumens of the two second liquid pipes are connected to the corresponding side liquid exchange chambers, and a valve core is installed in the middle liquid exchange chamber of the valve body ; It is characterized in that: the two ends of the valve core are respectively connected to the connecting rod, the connecting rod is connected to the power cylinder, the power cylinder includes a cylinder body, a piston and a sleeve, the cylinder body is provided with a cavity, a piston is installed in the cavity of the cylinder body, the outer wall of the piston is in contact with the inner wall of the cylinder cavity, and the outer end wall and the inner end wall of the cylinder body are respectively provided with air guide holes; a guide through hole is provided on the inner end wall of the cylinder body, a through hole is provided at the center of the piston, one end of the sleeve is inserted into the through hole at the center of the piston, and the connecting rod is connected to the guide cylinder through a connecting mechanism.

[0008] Furthermore, a sealing ring is installed between the piston and the inner wall of the cylinder cavity, and an annular groove is provided on the outer wall of the piston, and a sealing ring is installed in the annular groove.

[0009] Furthermore, a guide cylinder is installed in the cavity of the cylinder body, and guide holes are respectively provided at both ends of the sleeve. The two guide holes are connected by a threaded hole. The guide cylinder is inserted into the guide hole at the outer end of the sleeve and slides with the sleeve. A through hole is provided on the guide cylinder, and the through hole of the guide cylinder and the guide hole of the sleeve are arranged coaxially.

[0010] Furthermore, the connecting mechanism includes a spring and a stud, the connecting rod is inserted into the guide hole at the inner end of the sleeve, the threaded hole of the sleeve cooperates with the thread of the stud, the inner end of the stud and the inner end of the connecting rod are connected by a spring, and the outer end of the stud is provided with a hexagonal blind hole.

[0011] Furthermore, a boss is provided on the inner end wall of the cylinder body, the outer ends of the liquid exchange chambers on both sides of the valve body are open, the boss of the cylinder body is inserted into the outer end opening of the valve body, a stepped through hole is provided on the boss, a sealing plug is installed at the inner end of the stepped through hole, a guide through hole is provided on the sealing plug, and the sleeve passes through the guide through hole on the sealing plug.

[0012] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0013] 1. This utility model can maintain the pressure difference between the liquid inlet and the liquid outlet at the cut-off end. When the pressure at the liquid inlet at the cut-off end exceeds the set value, the pressure difference will push the valve core to move, compressing the spring, so that the liquid inlet and the liquid outlet at the cut-off end are connected through a small gap, thereby achieving a stable pressure difference between the liquid inlet and the liquid outlet at the cut-off end;

[0014] 2. Power cylinders are installed on both sides of the reversing valve of the present invention. The power cylinders are connected to the valve core of the reversing valve. Since the power cylinders can move quickly, the valve core can move quickly in the valve body, so that the reversing valve can quickly achieve reversal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the main view of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 yes Figure 2 A partial enlarged view of part C in the middle;

[0018] Among them, 1. reversing valve, 11. valve body, 12. first liquid pipe, 13. side liquid exchange chamber, 14. middle liquid exchange chamber, 15. valve core, 16. connecting rod, 17. second liquid pipe, 2. power cylinder, 21. cylinder body, 22. piston, 23. guide cylinder, 24. sealing plug, 25. boss, 26. sleeve, 3. connecting mechanism, 31. stud, 32. spring. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0020] like Figure 1 and 2 As shown, the utility model includes a power cylinder 2 and a reversing valve 1.

[0021] The reversing valve 1 includes a valve body 11 and a valve core 15. A liquid exchange chamber is provided inside the valve body 11. The liquid exchange chamber includes a middle liquid exchange chamber 14 and two side liquid exchange chambers 13. The two side liquid exchange chambers 13 are respectively located at the two ends of the middle liquid exchange chamber 14. The middle liquid exchange chamber 14 is connected to the two side liquid exchange chambers 13 through connecting holes. A first liquid pipe 12 is provided at the upper end of the valve body 11, and two symmetrically arranged second liquid pipes 17 are provided at the lower end. The lumen of the first liquid pipe 12 is connected to the middle liquid exchange chamber 14, and the lumen of the two second liquid pipes 17 are respectively connected to the corresponding side liquid exchange chambers 13.

[0022] For the convenience of description, the outlet of the first liquid pipe 12 is set as port P, the inlet of the left second liquid pipe 17 is set as port A, and the inlet of the right second liquid pipe 17 is set as port B.

[0023] A valve core 15 is installed in the middle liquid exchange chamber 14 of the valve body 11. During movement, the valve core 15 can block one communicating hole respectively, so that the other communicating hole connects the middle liquid exchange chamber 14 and the corresponding side liquid exchange chamber 13. The two ends of the valve core 15 are respectively connected to the connecting rod 16, and the connecting rod 16 is connected to the power cylinder 2.

[0024] The power cylinder includes a cylinder body 21, a piston 22 and a sleeve 26. The cylinder body 21 is provided with a cavity, and the piston 22 is installed in the cavity of the cylinder body 21. The outer wall of the piston 22 fits with the inner wall of the cavity of the cylinder body 21, and the outer end wall and the inner end wall of the cylinder body 21 are respectively provided with air guide holes.

[0025] In the optimized solution, a sealing ring is installed between the piston 22 and the inner wall of the cavity of the cylinder body 21, and an annular groove is provided on the outer wall of the piston 22, and a sealing ring is installed in the annular groove.

[0026] A guide through hole is provided on the inner end wall of the cylinder body 21, a through hole is provided at the center of the piston 22, one end of the sleeve 26 is inserted into the through hole at the center of the piston 22, and a guide cylinder 23 is installed in the cavity of the cylinder body 21. The guide cylinder 23 is vertically fixedly connected to the inner side of the outer end wall of the cylinder body 21. Guide holes are respectively provided at both ends of the sleeve 26, and the two guide holes are connected by a threaded hole. The guide cylinder 23 is inserted into the guide hole at the outer end of the sleeve 26 and slides with the sleeve 26. A through hole is provided on the guide cylinder 23, and the through hole of the guide cylinder 23 is coaxially arranged with the guide hole of the sleeve 26.

[0027] like Figure 3 As shown, the connecting rod 16 is inserted into the guide hole at the inner end of the sleeve 26 and is connected to the guide cylinder 23 through the connecting mechanism 3. The connecting mechanism 3 includes a spring 32 and a stud 31. The connecting rod 16 is inserted into the guide hole at the inner end of the sleeve 26. The threaded hole of the sleeve 26 is threadedly matched with the stud 31. The inner end of the stud 31 is connected to the inner end of the connecting rod 16 by the spring 32. The outer end of the stud 31 is provided with a hexagonal blind hole.

[0028] A boss 25 is provided on the inner end wall of the cylinder body 21. The outer ends of the liquid exchange chambers 13 on both sides of the valve body 11 are open. The boss 25 of the cylinder body 21 is inserted into the outer end opening of the valve body 11. A sealing ring is installed on the outer end of the boss 25 and the inner wall of the opening of the cylinder body 21.

[0029] In the optimized solution, a stepped through hole is provided on the boss 25, a sealing plug 24 is installed at the inner end of the stepped through hole, multiple sealing rings are installed between the sealing plug 24 and the inner end hole of the stepped through hole, a guide through hole is provided on the sealing plug 24, and the sleeve 26 passes through the guide through hole on the sealing plug 24.

[0030] The operation process is as follows: When using the present invention, the valve core 15 is blocked in the communication hole corresponding to port A. At this time, port P is connected to port B, and port A and port P are blocked. There is a pressure difference between ports A and P. When the pressure at port A exceeds the set value, the pressure difference will push the valve core 15 to the right, compressing the spring 32 on the right side, so that the gap between ports A and P is connected, thereby achieving a stable pressure difference between port A and port P. When it is necessary to adjust the pressure of the valve core 15 at the communication hole, use a hexagonal wrench through the through hole of the guide cylinder 23 and insert it into the hexagonal blind hole of the stud 31. Rotate the stud 31 to compress or relax the spring 32, thereby adjusting the pressure of the valve core 15 at the communication hole.

[0031] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the scope of protection of the present invention.

Claims

1. A stop-type pneumatic reversing valve, comprising a power cylinder (2) and a reversing valve (1), wherein the reversing valve (1) comprises a valve body (11) and a valve core (15), wherein a liquid exchange chamber is provided inside the valve body (11), wherein the liquid exchange chamber comprises a middle liquid exchange chamber (14) and two side liquid exchange chambers (13), wherein the middle liquid exchange chamber (14) is connected to the two side liquid exchange chambers (13) through communication holes, wherein the upper end of the valve body (11) is provided with a first liquid pipe (12) interpenetrating with the middle liquid exchange chamber (14), and the lower end of the valve body (11) is provided with two symmetrically arranged second liquid pipes (17), wherein the lumens of the two second liquid pipes (17) are interpenetrating with the corresponding side liquid exchange chambers (13), and wherein the valve core (15) is installed in the middle liquid exchange chamber (14) of the valve body (11); wherein the valve core (15) is installed in the middle liquid exchange chamber (14) of the valve body (11); wherein the valve core (15) is installed in the middle liquid exchange chamber (14) of the valve body (11); wherein the valve core (15) is installed in the middle liquid exchange chamber (14) of the valve body (11); The two ends of the valve core (15) are respectively connected to the connecting rod (16), and the connecting rod (16) is connected to the power cylinder (2). The power cylinder includes a cylinder body (21), a piston (22) and a sleeve (26). The cylinder body (21) is provided with a cavity. The piston (22) is installed in the cavity of the cylinder body (21). The outer wall of the piston (22) is in contact with the inner wall of the cavity of the cylinder body (21). The outer end wall and the inner end wall of the cylinder body (21) are respectively provided with air guide holes; the inner end wall of the cylinder body (21) is provided with a guide through hole, and the center of the piston (22) is provided with a through hole. One end of the sleeve (26) is inserted into the through hole at the center of the piston (22). The connecting rod (16) is connected to the guide cylinder (23) through a connecting mechanism (3).

2. A cut-off pneumatic directional control valve according to claim 1, characterized in that: A sealing ring is installed between the piston (22) and the inner wall of the cylinder (21) cavity. An annular groove is provided on the outer wall of the piston (22), and a sealing ring is installed in the annular groove.

3. A cut-off pneumatic reversing valve according to claim 1, characterized in that: A guide cylinder (23) is installed in the cavity of the cylinder body (21), and guide holes are respectively provided at both ends of the sleeve (26). The two guide holes are connected by a threaded hole. The guide cylinder (23) is inserted into the guide hole at the outer end of the sleeve (26) and slides with the sleeve (26). A through hole is provided on the guide cylinder (23), and the through hole of the guide cylinder (23) and the guide hole of the sleeve (26) are arranged coaxially.

4. A cut-off pneumatic directional control valve according to claim 3, characterized in that: The connecting mechanism (3) includes a spring (32) and a stud (31). The connecting rod (16) is inserted into the guide hole at the inner end of the sleeve (26). The threaded hole of the sleeve (26) is threadedly matched with the stud (31). The inner end of the stud (31) is connected to the inner end of the connecting rod (16) via the spring (32). The outer end of the stud (31) is provided with a hexagonal blind hole.

5. The cut-off pneumatic directional control valve according to claim 3, characterized in that: A boss (25) is provided on the inner end wall of the cylinder body (21), and the outer ends of the liquid exchange chambers (13) on both sides of the valve body (11) are open. The boss (25) of the cylinder body (21) is inserted into the outer end opening of the valve body (11). A stepped through hole is provided on the boss (25), and a sealing plug (24) is installed at the inner end of the stepped through hole. The sealing plug (24) is provided with a guide through hole, and the sleeve (26) passes through the guide through hole on the sealing plug (24).

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