Pilot valve for controlling reversing mechanism

Abstract

The utility model belongs to the technical field of control reversing, and particularly relates to a pilot valve of a control reversing mechanism, which comprises a valve body and a valve core vertically arranged in the valve body in a sliding manner, the side wall of the valve body is sequentially provided with an air inlet, a reversing mechanism port and a release port from top to bottom, and a sealing ring for sealing a gap between the valve body and the valve core is sleeved outside the valve core. When the sealing ring is located between the air inlet and the port of the reversing mechanism, the air inlet is disconnected from the port of the reversing mechanism, and the port of the reversing mechanism is communicated with the release port; when the sealing ring is located between the reversing mechanism port and the release port, the air inlet is communicated with the reversing mechanism port, and the reversing mechanism port is disconnected from the release port. The utility model has the advantages of simple structure and good sealing effect, and can effectively prevent mutual blow-by phenomenon.

Description

Technical fields:

[0001] This utility model belongs to the field of control and reversing technology, and specifically refers to a pilot valve for controlling and reversing mechanisms. Background technology:

[0002] Chinese utility model patent (publication number CN222163756U, application date 2024.01.08, publication date 2024.12.13) discloses a pilot valve for controlling a reversing mechanism, including a valve body and a valve cover connected to the lower end of the valve body. A valve core is slidably disposed inside the valve body, and a switch rod is provided at the lower end of the valve core. The switch rod is slidably disposed inside the valve cover, with its lower end extending out of the valve cover. A compression spring is provided inside the valve body. The valve body is provided with an air inlet communicating with the inner cavity of the valve body and an air outlet communicating with the inner cavity of the valve body. The valve cover has a release port that connects to the inner cavity of the valve cover. When there is no external force, the valve core is sealed to the upper end of the valve cover under the action of the spring force, disconnecting the inner cavity of the valve body and the inner cavity of the valve cover. Gas flows to the reversing mechanism through the air inlet, the inner cavity of the valve body and the reversing mechanism port. When an external force hits the switch rod, the switch rod moves upward, compressing the spring. The valve core is not sealed to the valve cover, and the inner cavity of the valve body and the inner cavity of the valve cover are connected. Gas flows out through the air inlet, the inner cavity of the valve body, the inner cavity of the valve cover and the release port.

[0003] The shortcomings of the above-mentioned pilot valve are: the sealing effect between the valve core and the upper end of the valve cover is not good, and air leakage occurs. Utility Model Content:

[0004] The purpose of this invention is to provide a pilot valve for controlling a reversing mechanism, which has a good sealing effect and can effectively prevent cross-contamination of air.

[0005] This utility model is implemented as follows:

[0006] A pilot valve for controlling a reversing mechanism includes a valve body and a valve core slidably mounted vertically within the valve body. An air inlet, a reversing mechanism port, and a release port are sequentially arranged on the side wall of the valve body from top to bottom. A sealing ring is fitted over the valve core to seal the gap between the valve body and the valve core. When the sealing ring is located between the air inlet and the reversing mechanism port, the air inlet is disconnected from the reversing mechanism port, and the reversing mechanism port is connected to the release port. When the sealing ring is located between the reversing mechanism port and the release port, the air inlet is connected to the reversing mechanism port, and the reversing mechanism port is disconnected from the release port.

[0007] In the pilot valve of the aforementioned control reversing mechanism, a mounting protrusion ring protrudes from the outer periphery of the valve core, and the sealing ring is mounted on the mounting protrusion ring.

[0008] In the pilot valve of the aforementioned control reversing mechanism, the valve core has an upper support ring protruding from its upper outer periphery and a lower support ring protruding from its lower outer periphery. The upper support ring is provided with an upper air passage, and the lower support ring is provided with a lower air passage.

[0009] The upper and lower air passages can be structured as follows: the outer periphery of the upper support protrusion ring is provided with a plane one, and the upper air passage is formed between the plane one and the inner wall of the valve body; the outer periphery of the lower support protrusion ring is provided with a plane two, and the lower air passage is formed between the plane two and the inner wall of the valve body.

[0010] The upper and lower air passages can also be structured as follows: the upper air passage is a through hole located inside the upper support protrusion ring and used to connect the upper and lower sides of the upper support protrusion ring; the lower air passage is a through hole located inside the lower support protrusion ring and used to connect the upper and lower sides of the lower support protrusion ring.

[0011] In the pilot valve of the aforementioned control reversing mechanism, four are evenly distributed around the first circumference of the plane, thus forming four upper air passages; and four are evenly distributed around the second circumference of the plane, thus forming four lower air passages.

[0012] In the pilot valve of the aforementioned control reversing mechanism, the upper end face of the valve core is recessed to form a mounting groove. A compression spring is provided in the mounting groove. The upper end of the compression spring abuts against the valve body and the lower end abuts against the inner end face of the mounting groove. An air passage is provided on the side wall of the valve core, which connects the outside of the valve core and the mounting groove. The air passage is located below the upper support protrusion ring.

[0013] In the pilot valve of the aforementioned control reversing mechanism, the outer peripheral surface of the mounting convex ring is recessed to form an annular groove with a rectangular cross-section, and the sealing ring is disposed in the annular groove, with the sealing ring having a D-shaped cross-section.

[0014] In the pilot valve of the aforementioned control reversing mechanism, the valve body is mounted on the housing of a pneumatic motor. The housing has a mounting hole with an upper opening. The valve body is screwed into the mounting hole. The lower end of the valve body abuts against the inner end face of the mounting hole. A cavity for the valve core to slide is formed between the valve body and the mounting hole. A switch rod with its lower end extending out of the housing is provided below the valve core.

[0015] In the pilot valve of the aforementioned control reversing mechanism, the lower end face of the valve core is concave to form a second mounting groove, the upper end of the switch rod is slidably disposed in the second mounting groove and the lower end extends out of the housing, the upper end face of the switch rod is concave to form a third mounting groove, and a second compression spring is provided in the third mounting groove, the upper end of the second compression spring abutting against the inner end face of the second mounting groove and the lower end abutting against the inner end face of the third mounting groove.

[0016] In the pilot valve of the aforementioned control reversing mechanism, an O-ring 1 is fitted outside the valve body to seal the gap between the valve body and the housing. Three O-rings are provided, one of which is located above the air inlet, another between the air inlet and the reversing mechanism port, and the last O-ring between the reversing mechanism port and the release port. An O-ring 2 is fitted outside the switch rod to seal the gap between the switch rod and the housing.

[0017] The outstanding advantages of this utility model compared to the prior art are:

[0018] 1. This utility model has a sealing ring set outside the valve core to seal the gap between the valve body and the valve core. It has a good sealing effect and effectively prevents air leakage, thereby preventing the phenomenon of air leakage between them. The sealing ring is driven up and down by the valve core. It can be used to block the connection between the air inlet and the reversing mechanism port, and it can also be used to block the connection between the reversing mechanism port and the release port. The structure is ingeniously designed.

[0019] 2. The valve body of this utility model is installed on the housing of a pneumatic motor. The housing has a mounting hole with an open top. The valve body is screwed into the mounting hole. The lower end of the valve body abuts against the inner end face of the mounting hole. A cavity for the valve core to slide is formed between the valve body and the mounting hole. A switch rod with its lower end extending out of the housing is provided below the valve core. This utility model only requires a valve body, a valve core, and a switch rod. It has a simple structure, few parts, and only one screw connection. The coaxiality can be well controlled, and the processing and installation are easy. Attached image description:

[0020] Figure 1 This is a cross-sectional view showing the connection between the air inlet and the reversing mechanism port of this utility model.

[0021] Figure 2 This is a cross-sectional view showing the connection between the reversing mechanism port and the release port of this utility model;

[0022] Figure 3 This is a perspective view of the valve core of this utility model.

[0023] Reference numerals in the attached drawings: 1. Valve body; 2. Valve core; 3. Air inlet; 4. Reversing mechanism port; 5. Release port; 6. Sealing ring; 7. Mounting convex ring; 8. Upper support convex ring; 9. Lower support convex ring; 10. Plane 1; 11. Plane 2; 12. Mounting groove 1; 13. Compression spring 1; 14. Air passage hole; 15. Annular groove; 16. Housing; 17. Mounting hole; 18. Switch rod; 19. Mounting groove 2; 20. Mounting groove 3; 21. Compression spring 2; 22. O-ring 1; 23. O-ring 2. Detailed implementation method:

[0024] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —3:

[0025] A pilot valve for controlling a reversing mechanism includes a valve body 1 and a valve core 2 slidably disposed vertically within the valve body 1. The side wall of the valve body 1 is provided with an air inlet 3, a reversing mechanism port 4, and a release port 5, arranged sequentially from top to bottom. A sealing ring 6 is fitted over the valve core 2 to seal the gap between the valve body 1 and the valve core 2. When the sealing ring 6 is located between the air inlet 3 and the reversing mechanism port 4, the air inlet 3 is disconnected from the reversing mechanism port 4, and the reversing mechanism port 4 is connected to the release port 5. When the sealing ring 6 is located between the reversing mechanism port 4 and the release port 5, the air inlet 3 is connected to the reversing mechanism port 4, and the reversing mechanism port 4 is disconnected from the release port 5.

[0026] like Figure 1 , 2 As shown, this utility model provides a sealing ring 6 outside the valve core 2 to seal the gap between the valve body 1 and the valve core 2. It has a good sealing effect, effectively prevents air leakage, and thus prevents the phenomenon of air leakage between them. The sealing ring 6 is driven to move up and down by the valve core 2. The sealing ring 6 can be used to block the connection between the air inlet 3 and the reversing mechanism port 4, and it can also be used to block the connection between the reversing mechanism port 4 and the release port 5. The structure is ingeniously designed.

[0027] To better connect the air intake 3 with the reversing mechanism port 4, and the reversing mechanism port 4 with the release port 5, such as Figure 1-3 As shown, a mounting ring 7 protrudes from the outer periphery of the middle part of the valve core 2, and the sealing ring 6 is mounted on the mounting ring 7.

[0028] In order for valve core 2 to slide smoothly, such as Figure 1-3 As shown, the valve core 2 has an upper support ring 8 protruding from its upper outer periphery and a lower support ring 9 protruding from its lower outer periphery. The upper support ring 8 is provided with an upper air passage, and the lower support ring 9 is provided with a lower air passage.

[0029] To connect the upper and lower sides of the upper support protrusion 8, such as Figure 1-3 As shown, the outer periphery of the upper support protrusion ring 8 is provided with a plane 10, and the plane 10 and the inner wall of the valve body 1 form the upper air passage. The upper and lower sides of the upper support protrusion ring 8 are connected through the air passage.

[0030] To connect the upper and lower sides of the lower support protrusion 9, such as Figure 1-3 As shown, the lower support protruding ring 9 has a plane 11 on its outer periphery. The lower air passage is formed between the plane 11 and the inner wall of the valve body 1. The upper and lower sides of the lower support protruding ring 8 are connected through the lower air passage.

[0031] Furthermore, four are evenly distributed around the circumference of plane 10, thus forming four upper air passages; four are evenly distributed around the circumference of plane 21, thus forming four lower air passages.

[0032] The specific structure of the pilot valve: as follows Figure 1-3 As shown, the upper end face of the valve core 2 is recessed to form a mounting groove 12. A compression spring 13 is provided in the mounting groove 12. The upper end of the compression spring 13 abuts against the valve body 1, and the lower end abuts against the inner end face of the mounting groove 12. The side wall of the valve core 2 is provided with an air passage hole 14 that connects the outside of the valve core 2 and the mounting groove 12. The air passage hole 14 is located below the upper support protrusion ring 8. The air passage hole 14 connects the outside of the valve core 2 and the mounting groove 12, thereby reducing the influence of the air pressure in the mounting groove 12 on the upward movement of the valve core 2.

[0033] The structure and installation structure of sealing ring 6: as follows Figure 1-3 As shown, the outer circumferential surface of the mounting ring 7 is concave to form an annular groove 15 with a rectangular cross-section. The sealing ring 6 is disposed within the annular groove 15, and the cross-section of the sealing ring 6 is D-shaped. The sealing ring 6 of this utility model is a pneumatic solenoid valve seal, with a mature and stable structure, better sealing effect, and longer service life.

[0034] The specific structure and installation structure of the pilot valve: such as Figure 1 , 2 As shown, the valve body 1 is mounted on the housing 16 of the pneumatic motor. The housing 16 has a mounting hole 17 with an upper opening. The valve body 1 is screwed into the mounting hole 17, and the lower end of the valve body 1 abuts against the inner end face of the mounting hole 17. A cavity for the valve core 2 to slide is formed between the valve body 1 and the mounting hole 17. A switch rod 18 with its lower end extending out of the housing 16 is provided below the valve core 2. This utility model only requires the valve body 1, the valve core 2, and the switch rod 18, which has a simple structure, few parts, and only one screw connection. The coaxiality can be well controlled, and the processing and installation are easy.

[0035] The installation structure of the switch rod 18: The lower end face of the valve core 2 is recessed to form a second mounting groove 19. The upper end of the switch rod 18 is slidably disposed in the second mounting groove 19 and the lower end extends out of the housing 16. The upper end face of the switch rod 18 is recessed to form a third mounting groove 20. A second compression spring 21 is provided in the third mounting groove 20. The upper end of the second compression spring 21 abuts against the inner end face of the second mounting groove 19 and the lower end abuts against the inner end face of the third mounting groove 20.

[0036] To prevent air leakage from the pilot valve, as well as between the air inlet 3, the reversing mechanism port 4, and the release port 5, the valve body 1 is fitted with an O-ring 22 to seal the gap between the valve body 1 and the housing 16. Three O-rings 22 are provided: one O-ring 22 is located above the air inlet 3, another O-ring 22 is located between the air inlet 3 and the reversing mechanism port 4, and the last O-ring 22 is located between the reversing mechanism port 4 and the release port 5. The switch rod 18 is fitted with an O-ring 23 to seal the gap between the switch rod 18 and the housing 16.

[0037] The working principle of this utility model is as follows: When compressed air enters the pneumatic motor, under pressure, the piston in the pneumatic motor moves towards the low-pressure chamber of the pneumatic motor. When the piston reaches the set position, it strikes the switch rod 18 of the pilot valve. The switch rod 18 compresses the second compression spring 21, which then moves the valve core 2 upward, compressing the first compression spring 13. The sealing ring 6 is located between the air inlet 3 and the reversing mechanism port 4. The air inlet 3 is disconnected from the reversing mechanism port 4, and the reversing mechanism port 4 is connected to the release port 5. The air in the reversing mechanism is released into the atmosphere through the reversing mechanism port 4 and the release port 5, forming a low-pressure chamber at the reversing mechanism. Figure 2 As shown, at this time, the air pressure at both ends of the reversing mechanism is unbalanced, and the reversing mechanism moves towards the low-pressure chamber. Simultaneously, the reversing mechanism drives its valve block to move as well. The movement of the valve block causes the air inlet of the pneumatic motor to switch. This switching changes the high-pressure and low-pressure chambers on both sides of the pneumatic motor piston, causing the piston to move in the opposite direction from its previous direction of movement. When the piston leaves the switch rod 18, the switch rod 18 and valve core 3 move downwards under the action of compressed air, the elastic force of compression spring 13, and the elastic force of compression spring 21. The sealing ring 6 is located between the reversing mechanism port 4 and the release port 5. The air inlet 3 is connected to the reversing mechanism port 4, and the reversing mechanism port 4 is disconnected from the release port 5. The gas in the pneumatic motor drive passage flows through the air inlet 3 and the reversing mechanism port 4 to the reversing mechanism, forming a high-pressure chamber at the reversing mechanism. Figure 1 As shown.

[0038] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pilot valve for controlling a reversing mechanism, characterized in that: The valve body (1) includes a valve core (2) that slides vertically within the valve body (1). The valve body (1) has an air inlet (3), a reversing mechanism port (4), and a release port (5) arranged sequentially from top to bottom on its side wall. The valve core (2) is fitted with a sealing ring (6) that seals the gap between the valve body (1) and the valve core (2). When the sealing ring (6) is located between the air inlet (3) and the reversing mechanism port (4), the air inlet (3) is disconnected from the reversing mechanism port (4), and the reversing mechanism port (4) is connected to the release port (5). When the sealing ring (6) is located between the reversing mechanism port (4) and the release port (5), the air inlet (3) is connected to the reversing mechanism port (4), and the reversing mechanism port (4) is disconnected from the release port (5).

2. The pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The valve core (2) has a mounting protrusion (7) on its outer periphery, and the sealing ring (6) is mounted on the mounting protrusion (7).

3. The pilot valve for controlling the reversing mechanism according to claim 2, characterized in that: The valve core (2) has an upper support ring (8) protruding from the outer periphery of its upper end and a lower support ring (9) protruding from the outer periphery of its lower end. The upper support ring (8) is provided with an upper air passage, and the lower support ring (9) is provided with a lower air passage.

4. The pilot valve for controlling a reversing mechanism according to claim 3, characterized in that: The outer periphery of the upper support protrusion ring (8) is provided with a plane one (10), and the upper air passage is formed between the plane one (10) and the inner wall of the valve body (1); the outer periphery of the lower support protrusion ring (9) is provided with a plane two (11), and the lower air passage is formed between the plane two (11) and the inner wall of the valve body (1).

5. A pilot valve for controlling a reversing mechanism according to claim 3, characterized in that: The upper end face of the valve core (2) is recessed to form a mounting groove (12). A compression spring (13) is provided in the mounting groove (12). The upper end of the compression spring (13) abuts against the valve body (1) and the lower end abuts against the inner end face of the mounting groove (12). The side wall of the valve core (2) is provided with an air passage (14) that connects the outside of the valve core (2) and the mounting groove (12). The air passage (14) is located below the upper support protrusion ring (8).

6. A pilot valve for controlling a reversing mechanism according to claim 2, characterized in that: The outer circumferential surface of the mounting convex ring (7) is recessed to form an annular groove (15) with a rectangular cross section. The sealing ring (6) is disposed in the annular groove (15), and the cross section of the sealing ring (6) is D-shaped.

7. The pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The valve body (1) is mounted on the housing (16) of the pneumatic motor. The housing (16) has a mounting hole (17) with an upper opening. The valve body (1) is screwed into the mounting hole (17). The lower end of the valve body (1) abuts against the inner end face of the mounting hole (17). A cavity for the valve core (2) to slide is formed between the valve body (1) and the mounting hole (17). A switch rod (18) with its lower end extending out of the housing (16) is provided below the valve core (2).

8. A pilot valve for controlling a reversing mechanism according to claim 7, characterized in that: The lower end face of the valve core (2) is recessed to form a second mounting groove (19). The upper end of the switch rod (18) is slidably disposed in the second mounting groove (19) and the lower end extends out of the housing (16). The upper end face of the switch rod (18) is recessed to form a third mounting groove (20). A second compression spring (21) is provided in the third mounting groove (20). The upper end of the second compression spring (21) abuts against the inner end face of the second mounting groove (19) and the lower end abuts against the inner end face of the third mounting groove (20).

9. A pilot valve for controlling a reversing mechanism according to claim 8, characterized in that: The valve body (1) is fitted with an O-ring (22) to seal the gap between the valve body (1) and the housing (16). There are three O-rings (22), one of which is located above the air inlet (3), another is located between the air inlet (3) and the reversing mechanism port (4), and the last O-ring (22) is located between the reversing mechanism port (4) and the release port (5). The switch rod (18) is fitted with an O-ring (23) to seal the gap between the switch rod (18) and the housing (16).

Images