Hydraulic control one-way valve

Abstract

The utility model belongs to the technical field of hydraulic control one-way valves, and particularly relates to a hydraulic control one-way valve which comprises a valve body mechanism and a valve core mechanism, the valve body mechanism comprises a valve body, a valve core cavity, an oil inlet, an oil outlet, a control cavity and a control oil port, the valve core cavity is arranged on the right side of an inner cavity of the valve body, the oil inlet is arranged at the right end of the valve core cavity, and the control oil port is arranged at the right end of the valve core cavity. An oil outlet is formed in the right side of the top of the valve element cavity, a control cavity is formed in the left side of an inner cavity of the valve body, and a control oil port is formed in the right side of the bottom of the control cavity. The valve element mechanism is arranged on the valve body, the valve element mechanism comprises a sliding rod, a valve element, a control piston, a spring and a pull rod, when the pressure of control oil is unbalanced, the pull rod on the valve element mechanism can be pulled, the valve element mechanism is manually controlled to move, the emergency control effect is achieved, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pilot-operated check valves, and specifically relates to a pilot-operated check valve. Background Technique

[0002] A pilot-operated check valve is a valve that can make the check valve flow reversely by relying on the control fluid pressure. This kind of valve plays an important role in the hydraulic support equipment of coal mine machinery. The difference between a pilot-operated check valve and an ordinary check valve is that there is an additional control oil circuit. When the control oil circuit is not connected to the pressurized oil, the pilot-operated check valve works like an ordinary check valve, and the pressurized oil only flows from the oil inlet to the oil outlet and cannot flow reversely. When there is a control pressure input in the control oil circuit, the piston push rod moves to the right under the action of the pressurized oil, and the check valve is pushed open by the push rod, so that the oil inlet and outlet are connected. If the oil outlet is larger than the oil inlet, the oil can flow reversely.

[0003] When the existing pilot-operated check valve is in use, the control oil circuit is completely controlled by the pressure of the control oil. When the control pressure is depressurized, it does not have the function of manual control and cannot switch to manual for emergency control. Therefore, this application proposes a pilot-operated check valve. Content of the Utility Model

[0004] The purpose of this part is to outline some aspects of the implementation mode of the utility model and briefly introduce some preferred implementation modes. Simplifications or omissions may be made in this part, as well as in the abstract of the specification and the name of the utility model of this application, to avoid obscuring the purpose of this part, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above and / or problems existing in an existing pilot-operated check valve, the present utility model is proposed.

[0006] Therefore, the purpose of the present utility model is to provide a pilot-operated check valve, which can pull the pull rod on the valve core mechanism and manually control the activity of the valve core mechanism when the pressure of the control oil is unbalanced, achieving the effect of emergency control and improving the use safety.

[0007] To solve the above technical problems, according to one aspect of the present utility model, the following technical solutions are provided:

[0008] A pilot-operated check valve, which includes:

[0009] A valve body mechanism, including a valve body, a valve core chamber, an oil inlet, an oil outlet, a control chamber and a control oil port. A valve core chamber is arranged on the right side of the inner cavity of the valve body. An oil inlet is arranged at the right end of the valve core chamber. An oil outlet is arranged on the top right side of the valve core chamber. A control chamber is arranged on the left side of the inner cavity of the valve body. A control oil port is arranged on the bottom right side of the control chamber;

[0010] The spool mechanism is arranged on the valve body. The spool mechanism includes a slide bar, a spool, a control piston, a spring and a pull rod. The slide bar is slidably connected between the spool chamber and the control chamber. The right end of the slide bar is provided with a spool located in the spool chamber. The left end of the slide bar is provided with a control piston located in the control chamber. A spring is arranged inside the spool chamber. The left side of the control piston is provided with a pull rod extending out of the left side of the valve body.

[0011] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: a chute is arranged on the left side wall of the valve body. A manual control component is arranged at the left end of the pull rod. The manual control component includes a slider and a handle. The left end of the pull rod is provided with a slider slidably connected in the chute. The left end of the slider is provided with a handle.

[0012] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: a first limit hole is arranged on the chute. Second limit holes are arranged at both ends of the slider. A limit pin is arranged between the first limit hole and the second limit holes.

[0013] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: in the natural state of the spring, the spool is located at the right end of the spool chamber, and the control piston is located on the left side of the control oil port.

[0014] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: an anti-slip sleeve is arranged on the outer wall of the handle. The anti-slip sleeve is made of a sponge sleeve.

[0015] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: sealing washers are arranged between the slide bar and the spool chamber and the control chamber, and between the valve body and the pull rod.

[0016] As a preferred scheme of a pilot-operated check valve according to the present invention, wherein: when the control piston is located at the left end of the control chamber, the oil inlet and the oil outlet are communicated.

[0017] Compared with the prior art: in the present invention, high-pressure oil enters from the oil inlet, and under the action of pressure, the spool mechanism is pushed open and discharged from the oil outlet. After the oil inlet stops feeding oil, the spring rebounds to close the oil inlet and the oil outlet, realizing one-way flow. When reverse flow is required, control oil is injected through the control oil port to make the spool mechanism move leftward, so that the high-pressure oil at the oil outlet can flow reversely to the oil inlet. When the pressure of the control oil is unbalanced, the pull rod on the spool mechanism can be pulled to manually control the movement of the spool mechanism, achieving the effect of emergency control, improving the use safety, and being able to observe the use state of the valve according to the extended length of the pull rod. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will describe the present utility model in detail in conjunction with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0019] Figure 1 It is a schematic structural diagram of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the present utility model.

[0022] In the figure: 100 valve body mechanism, 110 valve body, 120 spool chamber, 130 oil inlet, 140 oil outlet, 150 control chamber, 160 control oil port, 170 sliding groove, 180 first limit hole, 200 spool mechanism, 210 sliding rod, 220 spool, 230 control piston, 240 spring, 250 pull rod, 300 manual control component, 310 slider, 320 handle, 330 second limit hole, 400 limit pin. Detailed Embodiments

[0023] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed embodiments of the present utility model in conjunction with the drawings.

[0024] Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0025] Secondly, the present utility model is described in detail in conjunction with the schematic diagrams. When detailing the embodiments of the present utility model, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0026] To make the purpose, technical solutions, and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model in conjunction with the drawings.

[0027] The utility model provides a pilot-operated check valve, which can pull the pull rod on the spool mechanism when the pressure of the control oil is unbalanced, manually control the movement of the spool mechanism, achieve the effect of emergency control, and improve the use safety. Please refer to Figures 1 - 3 , including: a valve body mechanism 100 and a spool mechanism 200.

[0028] The valve body mechanism 100 includes a valve body 110, a spool chamber 120, an oil inlet 130, an oil outlet 140, a control chamber 150 and a control oil port 160. A spool chamber 120 is arranged on the right side of the inner cavity of the valve body 110. An oil inlet 130 is arranged at the right end of the spool chamber 120. An oil outlet 140 is arranged on the right side of the top of the spool chamber 120. A control chamber 150 is arranged on the left side of the inner cavity of the valve body 110. A control oil port 160 is arranged on the right side of the bottom of the control chamber 150;

[0029] Among them, the structure of the valve body mechanism 100 is as shown in Figure 2 . The spool chamber 120, the oil inlet 130 and the oil outlet 140 are interconnected for the control of the oil circuit. The control chamber 150 and the control oil port 160 are connected for the control of the spool mechanism 200.

[0030] The spool mechanism 200 is arranged on the valve body 110. The spool mechanism 200 includes a slide bar 210, a spool 220, a control piston 230, a spring 240 and a pull rod 250. The slide bar 210 is slidably connected between the spool chamber 120 and the control chamber 150. A spool 220 located in the spool chamber 120 is arranged at the right end of the slide bar 210. A control piston 230 located in the control chamber 150 is arranged at the left end of the slide bar 210. A spring 240 is arranged inside the spool chamber 120. A pull rod 250 extending out of the left side of the valve body 110 is arranged on the left side of the control piston 230;

[0031] Among them, in the natural state of the spring 240, the spool 220 is located at the right end of the spool chamber 120, the control piston 230 is located on the left side of the control oil port 160. When the control piston 230 is located at the left end of the control chamber 150, the oil inlet 130 and the oil outlet 140 are connected. The slide bar 210, the spool 220, the control piston 230, the spring 240 and the pull rod 250 are fixedly connected to facilitate synchronous movement. The end of the pull rod 250 is located outside the valve body 110, which is convenient to observe the use state of the valve through the pull rod 250, and the pull rod 250 can be pulled to manually control the working position of the spool mechanism 200.

[0032] Since the pull rod 250 is smooth and difficult to pull, a chute 170 is provided on the left side wall of the valve body 110. A manual control component 300 is provided at the left end of the pull rod 250. The manual control component 300 includes a slider 310 and a handle 320. A slider 310 slidably connected in the chute 170 is provided at the left end of the pull rod 250, and a handle 320 is provided at the left end of the slider 310. The pull rod 250 can be pulled by grasping the handle 320 to drive the spool mechanism 200 to move.

[0033] Since the staff needs to maintain the pulling state after pulling, and it will automatically rebound after loosening, a first limiting hole 180 is provided on the chute 170, and second limiting holes 330 are provided at both ends of the slider 310. A limiting pin 400 is provided between the first limiting hole 180 and the second limiting hole 330. After pulling, the limiting pin 400 needs to be inserted between the first limiting hole 180 and the second limiting hole 330 for limiting, liberating the staff's hands and eliminating the need for the staff to maintain the pulling posture.

[0034] For easy grasping and use and to avoid hand slipping, an anti-slip sleeve is provided on the outer wall of the handle 320. The anti-slip sleeve is made of a sponge sleeve to improve the anti-slip effect and facilitate grasping and use.

[0035] To avoid leakage and pressure reduction, sealing washers are provided between the slide rod 210 and the spool chamber 120 and the control chamber 150, and between the valve body 110 and the pull rod 250 to improve the sealing effect and prevent control oil from leaking.

[0036] During specific use, when controlling through the oil circuit, the limiting pin 400 is pulled out, and high-pressure oil enters from the oil inlet 130. Under the action of pressure, the spool mechanism 200 is pushed open and discharged from the oil outlet 140. After the oil inlet 130 stops admitting oil, the spring 240 rebounds to close the oil inlet 130 and the oil outlet, achieving one-way flow. When reverse flow is required, control oil is injected through the control oil port 160 to increase the pressure on the right side of the control piston 230, prompting the control piston 230 to move leftward, driving the spool mechanism 200 to move leftward, so that the high-pressure oil at the oil outlet 140 can flow reversely to the oil inlet 130.

[0037] When the pressure of the control oil is unbalanced, manual emergency control is required. At this time, the spool mechanism 200 is driven to move by grasping the handle 320 and pulling the pull rod 250. After pulling, the limiting pin 400 can be inserted between the first limiting hole 180 and the second limiting hole 330 for limiting, liberating the staff's hands and eliminating the need for the staff to maintain the pulling posture, achieving the effect of emergency control, improving the use safety, and being able to observe the use state of the valve according to the extended length of the pull rod 250.

[0038] Although the present utility model has been described above with reference to the embodiments, various improvements can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present utility model can be combined with each other in any way, and the exhaustive description of these combinations is not given in this specification only for the consideration of saving space and resources. Therefore, the present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A hydraulic check valve, characterized in that, Comprising: A valve body mechanism (100), including a valve body (110), a spool chamber (120), an oil inlet (130), an oil outlet (140), a control chamber (150) and a control oil port (160). A spool chamber (120) is arranged on the right side of the inner cavity of the valve body (110). An oil inlet (130) is arranged at the right end of the spool chamber (120). An oil outlet (140) is arranged on the upper right side of the spool chamber (120). A control chamber (150) is arranged on the left side of the inner cavity of the valve body (110). A control oil port (160) is arranged on the lower right side of the control chamber (150). A spool mechanism (200) is arranged on the valve body (110). The spool mechanism (200) includes a slide bar (210), a spool (220), a control piston (230), a spring (240) and a pull rod (250). The slide bar (210) is slidably connected between the spool chamber (120) and the control chamber (150). A spool (220) located in the spool chamber (120) is arranged at the right end of the slide bar (210). A control piston (230) located in the control chamber (150) is arranged at the left end of the slide bar (210). A spring (240) is arranged inside the spool chamber (120). A pull rod (250) extending out of the left side of the valve body (110) is arranged on the left side of the control piston (230).

2. The pilot-operated check valve according to claim 1, wherein A chute (170) is arranged on the left side wall of the valve body (110). A manual control component (300) is arranged at the left end of the pull rod (250). The manual control component (300) includes a slider (310) and a handle (320). A slider (310) slidably connected in the chute (170) is arranged at the left end of the pull rod (250). A handle (320) is arranged at the left end of the slider (310).

3. The pilot-operated check valve according to claim 2, characterized in that, A first limit hole (180) is arranged on the chute (170). Second limit holes (330) are arranged at both ends of the slider (310). A limit pin (400) is arranged between the first limit hole (180) and the second limit holes (330).

4. The one-way valve controlled by liquid according to claim 3, characterized in that, In the natural state of the spring (240), the spool (220) is located at the right end of the spool chamber (120), and the control piston (230) is located on the left side of the control oil port (160).

5. The pilot-operated check valve according to claim 4, wherein An anti-slip sleeve is arranged on the outer wall of the handle (320), and the anti-slip sleeve is made of a sponge sleeve.

6. The pilot-operated check valve according to claim 5, wherein Sealing washers are arranged between the slide bar (210) and the spool chamber (120) and the control chamber (150), and between the valve body (110) and the pull rod (250).

7. A hydraulic check valve according to claim 6, characterized in that, When the control piston (230) is located at the left end of the control chamber (150), the oil inlet (130) is communicated with the oil outlet (140).

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