Pilot valve for controlling reversing mechanism and pump using pilot valve

Abstract

The utility model belongs to the technical field of reversing control, and particularly relates to a pilot valve for controlling a reversing mechanism and a pump using the pilot valve, which comprise a valve body and a valve cover, a valve core is arranged in the valve body in a sliding manner, a switch lever is arranged at the lower end of the valve core, the switch lever is arranged in the valve cover in a sliding manner, and the lower end of the switch lever extends out of the valve cover; an air inlet and a reversing mechanism port are formed in the valve body, a release port communicated with an inner cavity of the valve cover is formed in the valve cover, when no external force exists, the valve element is sealed with the upper end of the valve cover under the elastic force action of the compression spring, the inner cavity of the valve body and the inner cavity of the valve cover are disconnected, and air flows to the reversing mechanism through the air inlet, the inner cavity of the valve body and the reversing mechanism port; when external force impacts the switch rod, the switch rod moves upwards, the compression spring is compressed, the valve element is not sealed with the valve deck, the valve body inner cavity is communicated with the valve deck inner cavity, and gas flows out through the gas inlet, the valve body inner cavity, the valve deck inner cavity and the release port. The utility model has the advantages of few parts, simple structure, low manufacturing cost, low installation requirement and lower risk of later problems.

Description

Technical field:

[0001] The utility model belongs to the technical field of reversing control, in particular to a pilot valve for controlling a reversing mechanism and a pump using the pilot valve. Background technology:

[0002] A pneumatic motor is a device that converts the pressure energy of compressed air into rotational mechanical energy. It usually requires a reversing mechanism to control the reversing direction. The reversing mechanism determines whether to reversing through a pilot valve.

[0003] Chinese invention patent CN102428307B discloses a control valve (i.e., a pilot valve), which is used to control a four-way valve (i.e., a reversing mechanism) in a pneumatic motor. The control valve has an actuating pin, a lifting valve, an inlet, a signal port, an energy storage spring, and an upper spring. The control valve is characterized in that the control valve also includes a sliding valve, which is attached to the control valve so as to constrain the signal port of the control valve above the lifting valve and generate a pressure drop.

[0004] The disadvantages of the above-mentioned pilot valve are: complex structure, large number of parts, high requirements for installation, and high risk of problems occurring later. Summary of the invention:

[0005] The utility model aims to provide a pilot valve for controlling a reversing mechanism and a pump using the pilot valve, which has few parts, simple structure, low manufacturing cost, low installation requirements and low risk of problems occurring in the later stage.

[0006] The utility model is achieved in this way:

[0007] When the throttle body is in the air, the throttle body is in the air-tight position, and the air in the throttle body is in the air-tight position, so that the throttle body is in the air-tight position, and ...

[0008] In the above-mentioned pilot valve for controlling the reversing mechanism, a hollow guide sleeve with an upper end opening is provided above the valve core, the guide sleeve is slidably arranged in the valve body, and the lower end of the compression spring is arranged in the guide sleeve.

[0009] In the above-mentioned pilot valve for controlling the reversing mechanism, a through hole communicating with the inside and outside of the side wall is provided on the side wall of the guide sleeve.

[0010] In the above-mentioned pilot valve for controlling the reversing mechanism, the air inlet is arranged on the side wall of the valve body, and there are multiple ports arranged on the circumference. The reversing mechanism port is arranged on the side wall of the valve body, and there are multiple ports arranged on the circumference. The reversing mechanism port is arranged below the air inlet, and the inner wall of the valve body forms an annular groove in the inner groove at the reversing mechanism port.

[0011] In the above-mentioned pilot valve of a control reversing mechanism, the upper end face of the valve cover is connected to the inner wall through a conical surface 1, the diameter of the conical surface 1 is larger at the top and smaller at the bottom, and the lower end face of the valve core is connected to the outer wall through a conical surface 2, and the conical surface 2 is adapted to the conical surface 1. When the valve core moves downward, the conical surface 2 and the conical surface 1 are in contact and sealed.

[0012] In the above-mentioned pilot valve for controlling the reversing mechanism, the outer wall of the valve cover is provided with an external thread, the inner wall of the lower end of the valve body is provided with an internal thread matching the external thread, and the valve cover is connected to the valve body through the screwed external thread and internal thread.

[0013] In the above-mentioned pilot valve for controlling the reversing mechanism, the release port is arranged on the side wall of the valve cover, and a plurality of release ports are arranged on the circumference.

[0014] In the above-mentioned pilot valve for controlling the reversing mechanism, the air inlet is connected to the air passage driven by the pneumatic motor, and the release port is connected to the atmosphere.

[0015] In the above-mentioned pilot valve for controlling the reversing mechanism, the valve core, the switch rod and the guide sleeve are an integrated structure.

[0016] In the above-mentioned pilot valve for controlling the reversing mechanism, two pilot valves are provided and are respectively arranged on both sides of the piston of the pneumatic motor. The pilot valve is screwed to the housing of the pneumatic motor through the valve body. The switch rod extends into the housing of the pneumatic motor. An O-ring 1 mounted outside the valve body is provided between the valve body and the housing of the pneumatic motor. An O-ring 2 mounted outside the switch rod is provided between the switch rod and the housing of the pneumatic motor.

[0017] Another object of the utility model is to provide a pump, comprising a pilot valve, wherein the pilot valve is any one of the pilot valves for controlling the reversing mechanism.

[0018] The outstanding advantages of the utility model compared with the prior art are:

[0019] 1. The valve body of the utility model is only provided with a valve core, a switch rod and a compression spring, with fewer parts, a simple structure, low manufacturing cost, low installation requirements, and a low risk of problems occurring later;

[0020] 2. A hollow guide sleeve with an upper opening is provided above the valve core of the utility model. The guide sleeve is slidably arranged in the valve body, and the lower end of the compression spring is arranged in the guide sleeve, so that the valve core can move smoothly in the valve body and prevent the compression spring from deflecting during compression and reset;

[0021] 3. The side wall of the guide sleeve of the utility model is provided with a through hole connecting the inside and outside of the side wall, so that the gas flowing in through the air inlet can better flow to the reversing mechanism port and the release port. Description of the drawings:

[0022] Figure 1 It is a cross-sectional view of the utility model in which the inner cavity of the valve body and the inner cavity of the valve cover are disconnected;

[0023] Figure 2 It is a cross-sectional view of the state in which the inner cavity of the valve body and the inner cavity of the valve cover of the utility model are connected;

[0024] Figure 3 It is the front view of the utility model.

[0025] Figure numerals: 1. valve body; 2. valve cover; 3. valve core; 4. switch rod; 5. compression spring; 6. valve body inner cavity; 7. air inlet; 8. reversing mechanism port; 9. valve cover inner cavity; 10. release port; 11. guide sleeve; 12. through hole; 13. annular groove; 14. cone surface one; 15. cone surface two; 16. O-ring one; 17. O-ring two. Specific implementation method:

[0026] The present invention is further described below with reference to specific embodiments. Figure 1 —3:

[0027] One of the purposes of the utility model is to provide a pilot valve for controlling a reversing mechanism, comprising a valve body 1 and a valve cover 2 connected to the lower end of the valve body 1, a valve core 3 is slidably arranged in the valve body 1, a switch rod 4 is arranged at the lower end of the valve core 3, the switch rod 4 is slidably arranged in the valve cover 2, and the lower end of the switch rod 4 extends out of the valve cover 2, a compression spring 5 is arranged in the valve body 1, an air inlet 7 connected to the inner cavity 6 of the valve body, and a reversing mechanism port 8 connected to the inner cavity 6 of the valve body and the reversing mechanism, the air inlet 7 is connected to the airway driven by the pneumatic motor, and the valve cover 2 is provided with a A release port 10 is connected to the valve cover inner cavity 9, and the release port 10 is connected to the atmosphere. When there is no external force, the valve core 3 is sealed with the upper end of the valve cover 2 under the elastic force of the compression spring 5, and the valve body inner cavity 6 and the valve cover inner cavity 9 are disconnected, and the gas flows to the reversing mechanism through the air inlet 7, the valve body inner cavity 6 and the reversing mechanism port 8; when an external force hits the switch rod 4, the switch rod 4 moves upward, compressing the compression spring 5, the valve core 3 is not sealed with the valve cover 2, the valve body inner cavity 6 and the valve cover inner cavity 9 are connected, and the gas flows out through the air inlet 7, the valve body inner cavity 6, the valve cover inner cavity 9 and the release port 10.

[0028] Installation structure of the pilot valve: There are two pilot valves, which are respectively arranged on both sides of the piston of the pneumatic motor. The pilot valve is screwed to the housing of the pneumatic motor through the valve body 1. The switch rod 4 extends into the housing of the pneumatic motor. An O-ring 16 sleeved on the outside of the valve body 1 is provided between the valve body 1 and the housing of the pneumatic motor. An O-ring 2 17 sleeved on the outside of the switch rod 4 is provided between the switch rod 4 and the housing of the pneumatic motor.

[0029] The working principle of the utility model is as follows: when compressed air enters the pneumatic motor, under the action of pressure, the piston in the pneumatic motor moves toward the low-pressure chamber of the pneumatic motor. When the piston moves to a certain distance, it hits the switch rod 4 of the pilot valve, and the switch rod 4 squeezes the compression spring 5. The valve core 3 is not sealed with the valve cover 2. The gas in the airway driven by the pneumatic motor is released into the atmosphere through the air inlet 7, the inner cavity 6 of the valve body, the inner cavity 9 of the valve cover and the release port 10, forming a low-pressure chamber at the reversing mechanism, such as Figure 2 As shown, at this time, the air pressure at both ends of the reversing mechanism is unbalanced, and the reversing mechanism moves toward the low-pressure chamber. The reversing mechanism drives its valve block to move together while moving. The movement of the valve block will cause the switching of the air inlet of the pneumatic motor. The switching of the air inlet will change the high-pressure chamber and the low-pressure chamber on both sides of the pneumatic motor piston, so that the piston moves in the opposite direction to the previous movement direction. When the piston leaves the switch rod 4, the switch rod 4 and the valve core 3 move downward under the action of compressed air and the elastic force of the compression spring 5. The valve core 3 seals the upper end of the valve cover 2. The gas in the airway driven by the pneumatic motor flows to the reversing mechanism through the air inlet 7, the inner cavity 6 of the valve body and the reversing mechanism port 8, forming a high-pressure chamber at the reversing mechanism, as shown in FIG. Figure 1 shown.

[0030] When the piston moves to a certain distance, it hits the switch rod 4 of the pilot valve at the other end, and the switch rod 4 squeezes the compression spring 5. The valve core 3 is not sealed with the valve cover 2. The air motor drives the gas in the airway to be released into the atmosphere through the air inlet 7, the valve body cavity 6, the valve cover cavity 9 and the release port 10, 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 toward the low-pressure chamber. The reversing mechanism drives its valve block to move together while moving. The movement of the valve block will cause the switching of the air inlet of the pneumatic motor. The switching of the air inlet will change the high-pressure chamber and the low-pressure chamber on both sides of the pneumatic motor piston, so that the piston moves in the opposite direction to the previous movement direction. When the piston leaves the switch rod 4, the valve core 3 moves and seals the upper end of the valve cover 2 under the action of compressed air and the elastic force of the compression spring 5. The gas in the airway driven by the pneumatic motor flows to the reversing mechanism through the air inlet 7, the inner cavity 6 of the valve body and the reversing mechanism port 8, forming a high-pressure chamber at the reversing mechanism, as shown in FIG. Figure 1 shown.

[0031] The utility model only has a valve core 3, a switch rod 4 and a compression spring 5 arranged in the valve body 1, has few parts, a simple structure, low manufacturing cost, low installation requirements and low risk of problems occurring in the later stage.

[0032] In order to ensure that the valve core 3 can move smoothly in the valve body 1 and prevent the compression spring 5 from deflecting during compression and resetting, a hollow guide sleeve 11 with an open upper end is provided above the valve core 3. The guide sleeve 11 is slidably arranged in the valve body 1, and the lower end of the compression spring 5 is arranged in the guide sleeve 11.

[0033] In order to better enable the gas flowing in through the air inlet 7 to flow to the reversing mechanism port 8 and the release port 10, as shown in FIG. Figure 1 , 2 As shown, the side wall of the guide sleeve 11 is provided with a through hole 12 communicating with the inside and outside of the side wall. When the valve core 3 seals the upper end of the valve cover 6, the gas flows to the reversing mechanism port 8 through the air inlet 7, the inner cavity 6 of the valve body, the inner cavity of the guide sleeve 11, the through hole 12, and the inner cavity 6 of the valve body. When the valve core 3 is not sealed with the valve cover 6, the gas flows to the release port 10 through the air inlet 7, the inner cavity 6 of the valve body, the inner cavity of the guide sleeve 11, the through hole 12, the inner cavity 6 of the valve body, and the inner cavity 9 of the valve cover.

[0034] Furthermore, the guide sleeve 11 will not block the air inlet 7 during the movement.

[0035] In order to better intake air from the air inlet 7 and better exhaust air from the reversing mechanism port 8, as Figure 1-3 As shown, the air inlet 7 is arranged on the side wall of the valve body 1, and there are multiple ports arranged on the circumference. The reversing mechanism port 8 is arranged on the side wall of the valve body 1, and there are multiple ports arranged on the circumference. The reversing mechanism port 8 is arranged below the air inlet 7. The inner wall of the valve body 1 forms an annular groove 13 in the inner groove at the reversing mechanism port 8 to prevent the guide sleeve 11 from blocking the reversing mechanism port 8 and affecting the air outlet.

[0036] In order to better seal the valve core 3 on the upper end of the valve cover 2, Figure 1 , 2 As shown, the upper end surface of the valve cover 2 is connected to the inner wall through a conical surface 14, and the diameter of the conical surface 14 is larger at the top and smaller at the bottom. The lower end surface of the valve core 3 is connected to the outer wall through a conical surface 2 15, and the conical surface 2 15 is adapted to the conical surface 14. When the valve core 3 moves downward, the conical surface 2 15 and the conical surface 14 contact and seal.

[0037] The connection structure between the valve cover 2 and the valve body 1 is as follows: Figure 1 , 2 As shown, the outer wall of the valve cover 2 is provided with an external thread, and the inner wall of the lower end of the valve body 1 is provided with an internal thread matched with the external thread. The valve cover 2 is connected to the valve body 1 through the screw-connected external thread and internal thread.

[0038] Furthermore, the release port 10 is arranged on the side wall of the valve cover 2, and a plurality of release ports 10 are arranged around the circumference.

[0039] Preferably, the valve core 3, the switch rod 4 and the guide sleeve 11 are an integrated structure.

[0040] Another object of the utility model is to provide a pump, comprising a pilot valve, wherein the pilot valve is any one of the pilot valves for controlling the reversing mechanism.

[0041] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pilot valve for controlling a reversing mechanism, characterized in that: The invention comprises a valve body (1) and a valve cover (2) connected to the lower end of the valve body (1); a valve core (3) is slidably arranged in the valve body (1); a switch rod (4) is arranged at the lower end of the valve core (3); the switch rod (4) is slidably arranged in the valve cover (2), and the lower end of the switch rod (4) extends out of the valve cover (2); a compression spring (5) is arranged in the valve body (1); an air inlet (7) communicating with the inner cavity (6) of the valve body and a reversing mechanism port (8) communicating with the inner cavity (6) of the valve body and the reversing mechanism are arranged on the valve body (1); a release port (10) communicating with the inner cavity (9) of the valve cover is arranged on the valve cover (2); When there is no external force, the valve core (3) is sealed with the upper end of the valve cover (2) under the elastic force of the compression spring (5), the valve body inner cavity (6) and the valve cover inner cavity (9) are disconnected, and the gas flows to the reversing mechanism through the air inlet (7), the valve body inner cavity (6) and the reversing mechanism port (8); when the external force hits the switch rod (4), the switch rod (4) moves upward, compressing the compression spring (5), the valve core (3) is no longer sealed with the valve cover (2), the valve body inner cavity (6) and the valve cover inner cavity (9) are connected, and the gas flows out through the air inlet (7), the valve body inner cavity (6), the valve cover inner cavity (9) and the release port (10).

2. A pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: A hollow guide sleeve (11) with an open upper end is provided above the valve core (3); the guide sleeve (11) is slidably arranged in the valve body (1); and the lower end of the compression spring (5) is arranged in the guide sleeve (11).

3. A pilot valve for controlling a reversing mechanism according to claim 2, characterized in that: The side wall of the guide sleeve (11) is provided with a through hole (12) communicating with the inside and outside of the side wall.

4. A pilot valve for controlling a reversing mechanism according to claim 2, characterized in that: The air inlet (7) is arranged on the side wall of the valve body (1) and is provided with a plurality of ports on the circumference; the reversing mechanism port (8) is arranged on the side wall of the valve body (1) and is provided with a plurality of ports on the circumference; the reversing mechanism port (8) is arranged below the air inlet (7); and an annular groove (13) is formed in the inner groove of the inner side wall of the valve body (1) at the reversing mechanism port (8).

5. A pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The upper end surface of the valve cover (2) is connected to the inner wall via a conical surface one (14), the diameter of the conical surface one (14) is larger at the top and smaller at the bottom, the lower end surface of the valve core (3) is connected to the outer wall via a conical surface two (15), the conical surface two (15) is matched with the conical surface one (14), when the valve core (3) moves downward, the conical surface two (15) and the conical surface one (14) contact and seal.

6. A pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The outer wall of the valve cover (2) is provided with an external thread, and the inner wall of the lower end of the valve body (1) is provided with an internal thread matching the external thread. The valve cover (2) is connected to the valve body (1) via the screw-connected external thread and internal thread.

7. A pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The release port (10) is arranged on the side wall of the valve cover (2), and a plurality of release ports (10) are arranged around the circumference.

8. The pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The air inlet (7) is connected to the air passage driven by the pneumatic motor, and the release port (10) is connected to the atmosphere.

9. A pilot valve for controlling a reversing mechanism according to claim 1, characterized in that: The pilot valves are provided in pairs and are respectively provided on both sides of the piston of the pneumatic motor. The pilot valves are screwed to the housing of the pneumatic motor through a valve body (1). The switch rod (4) extends into the housing of the pneumatic motor. An O-ring 1 (16) sleeved on the outside of the valve body (1) is provided between the valve body (1) and the housing of the pneumatic motor. An O-ring 2 (17) sleeved on the outside of the switch rod (4) is provided between the switch rod (4) and the housing of the pneumatic motor.

10. A pump, comprising a pilot valve, characterized in that: The pilot valve is a pilot valve for controlling a reversing mechanism as described in any one of claims 1 to 9.

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