Plug-in mounting type hydraulic lock

Abstract

The plug-in mounting type hydraulic lock comprises a shell assembly and a valve element. The shell assembly comprises a shell and a PEEK gasket; the valve element is arranged in the shell, the PEEK gasket is embedded into a groove in the inner wall of the shell in an interference press fit mode, and the PEEK gasket and the valve element form a sealing pair. The whole valve element is dumbbell-shaped, and section difference is designed. According to the plug-in mounting type hydraulic lock, high-reliability opening and zero-leakage stopping of a hydraulic loop are achieved, normal opening can be achieved when the opening pressure of a control opening fluctuates, and small leakage can be kept for a long time under a certain pressure when an oil way is stopped.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic transmission, and particularly to the opening lock design of a long-term load-bearing hydraulic circuit. Background Art

[0002] Due to the risk of leakage in the hydraulic circuit, the reliable locking of the hydraulic circuit maintaining the load position after power-off affects the achievement of the task objectives of the hydraulic system. At the same time, the locked oil circuit needs to be automatically opened during the working state, otherwise the system will be damaged due to pressure build-up. In order to ensure the reliability of the hydraulic system on aerospace equipment and ensure the reliable operation of the hydraulic actuator, a hydraulic locking device that is convenient to install and use, has high opening reliability, and small locking leakage needs to be designed. Summary of the Invention

[0003] The purpose of the present invention is to provide a cartridge-type hydraulic lock to achieve highly reliable opening and zero-leakage cut-off of the hydraulic circuit.

[0004] To achieve the above purpose, the present invention provides a cartridge-type hydraulic lock, including a housing assembly and a spool; the housing assembly includes a housing and a PEEK gasket; the spool is placed inside the housing, the PEEK gasket is embedded in the groove on the inner wall of the housing by interference press-fitting, and the PEEK gasket and the spool form a sealing pair; the spool is overall dumbbell-shaped and designed with a cross-sectional difference.

[0005] For the above cartridge-type hydraulic lock, the spool includes a front end, a middle end, and a rear end connected in sequence, and the radial dimensions of both the front end and the rear end are larger than the radial dimension of the middle end; define the end face of the front end facing the rear end as the C face, and the end face of the rear end facing the front end as the D face. The area of the D face is slightly larger than the area of the C face, and it can open automatically when there is a failure in the control port of the housing assembly or the control piston gets stuck.

[0006] For the above cartridge-type hydraulic lock, the cartridge-type hydraulic lock further includes a spring, a guide sleeve, an adjusting screw, a locking nut, and a fastening nut; the control piston is placed inside the housing; one end of the guide sleeve is inserted into the housing; one end of the spool is connected to the control piston, and the other end of the spool is inserted into the guide sleeve; the spring and the adjusting screw are placed inside the guide sleeve, one end of the spring contacts the spool, the other end of the spring contacts the adjusting screw, and the adjusting screw is fastened by the fastening screw; the guide sleeve is fixedly connected to the housing through the locking nut.

[0007] For the above cartridge-type hydraulic lock, the opening and closing pressures of the cartridge-type hydraulic lock are adjusted by the adjusting screw, and the fastening and loosening are carried out by the fastening screw.

[0008] In the above-mentioned plug-in hydraulic lock, a cavity is provided at the rear end of the valve core, the rear end is inserted into the guide sleeve, and one end of the spring is inserted into the cavity at the rear end.

[0009] In the above-mentioned plug-in hydraulic lock, the sealing surface of the PEEK gasket is designed with an arc angle.

[0010] The above-mentioned plug-in hydraulic lock, wherein the control piston and the guide sleeve are designed as long guides.

[0011] In the above-mentioned plug-in hydraulic lock, the adjusting screw squeezes the spring and applies a leftward force to the spring; when there is no external force at the control port, under the action of the spring, the valve core contacts and squeezes the PEEK gasket, and the plug-in hydraulic lock is in a locked state; when a rightward force is applied from the control port, the force pushes the control piston to the right, driving the valve core to overcome the spring elastic force and move to the right together, and the valve core is out of contact with the PEEK gasket, and the plug-in hydraulic lock is in an unlocked state.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are:

[0013] In the plug-in hydraulic lock of the present invention, the PEEK gasket and the valve core form a sealing pair, which is a special non-metal and metal sealing pair. The high hardness of the special non-metal ensures the sealing life, and the good elasticity of the special non-metal can realize adaptive deformation and improve the sealing performance. If the B port has a large load pressure, the plug-in hydraulic lock is closed at this time, and the PEEK gasket and the valve core form a high-reliability seal of non-metal and metal, which can maintain a small leakage for a long time. If the control pressure is suddenly reduced or the control piston is stuck, due to the cross-sectional difference of the valve core, the pressure acts on two unequal cross-sections to form a pressure difference, which ensures the fault opening of the hydraulic lock and ensures the high-reliability opening of the hydraulic lock.

[0014] In the plug-in hydraulic lock of the present invention, the sealing surface of the PEEK gasket is designed with an arc angle, which ensures that the PEEK gasket has a longer working life when it cooperates with the valve core; the control piston and the guide sleeve are designed with a long guide, which effectively avoids the tilting of the spring during the working process;

[0015] The plug-in hydraulic lock of the present invention is a plug-in structure with small size and easy installation. It can open normally when the opening pressure of the control port fluctuates, and can maintain a small leakage for a long time under a certain pressure when the oil circuit is cut off. It has the ability to resist the interference of pressure fluctuations, realizes the function of high-reliability locking when a fault is opened, and improves the reliability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The plug-in hydraulic lock of the present invention is provided by the following embodiments and drawings.

[0017] Figure 1This is a cross-sectional view of the plug-in hydraulic lock according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of the housing assembly in an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional view of the spool valve in an embodiment of the present invention. Detailed implementation manners

[0020] The following will further describe in detail the plug-in hydraulic lock of the present invention in conjunction with Figures 1 to 3 the present invention will be further described in detail.

[0021] To achieve the purpose of the present invention, the present invention optimizes the design of the sealing pair and the spool valve structure input to the hydraulic lock.

[0022] Figure 1 The figure shows a cross-sectional view of the plug-in hydraulic lock according to an embodiment of the present invention; Figure 2 The figure shows a cross-sectional view of the housing assembly in an embodiment of the present invention.

[0023] As Figure 1 and Figure 2 shown, the plug-in hydraulic lock of this embodiment includes a housing assembly 1, a control piston 2, a spool valve 3, a spring 4, a guide sleeve 5, an adjusting screw 6, a locking nut 7 and a fastening nut 8; the housing assembly 1 includes a housing 101 and a PEEK gasket 102;

[0024] The control piston 2 and the spool valve 3 are placed inside the housing 101; one end of the guide sleeve 5 is inserted into the housing 101; one end of the spool valve 3 is connected to the control piston 2, and the other end of the spool valve 3 is inserted into the guide sleeve 5;

[0025] The spring 4 and the adjusting screw 6 are placed inside the guide sleeve 5. One end of the spring 4 contacts the spool valve 3, and the other end of the spring 4 contacts the adjusting screw 6. After applying a force to the spring 4 through the adjusting screw 6 and adjusting the force applied by the adjusting screw 6 to the spring 4, the adjusting screw 6 is fastened by the fastening screw 8;

[0026] The guide sleeve 5 is fixedly connected to the housing 101 through the locking nut 7;

[0027] As Figure 2 , the PEEK gasket 102 is embedded in the groove on the inner wall of the housing 101 by interference press-fitting; the PEEK gasket 102 and the spool valve 3 form a sealing pair, and this sealing pair is a special non-metal and metal sealing pair. The high hardness of the special non-metal ensures the sealing life, and the good elasticity of the special non-metal can achieve adaptive deformation and improve the sealing performance;

[0028] On both sides of the sealing pair, through holes are provided on the housing 101, such as Figure 1 , the through hole on the left side of the sealing pair is defined as port A, and the through hole on the right side of the sealing pair is defined as port B.

[0029] The plug-in type hydraulic lock of this embodiment is of a plug-in type structure, with small volume and convenient installation.

[0030] Such as Figure 1 , the working principle of the plug-in type hydraulic lock of this embodiment is as follows:

[0031] The plug-in type hydraulic lock of this embodiment communicates with external liquid (oil) through port A and port B on the housing 101; the adjusting screw 6 presses the spring 4, applying a leftward force to the spring 4; in the case of no external force at the control port, under the action of the spring 4, the valve core 3 contacts and presses the PEEK gasket 102, and at this time the plug-in type hydraulic lock is in the locked state. The good elasticity of the PEEK gasket 102 can achieve adaptive deformation, improving the sealing performance; when a rightward force is applied from the control port, this force pushes the control piston 2 to move rightward, driving the valve core 3 to move rightward together against the elastic force of the spring 4, and the valve core 3 disengages from the contact with the PEEK gasket 102. At this time, the plug-in type hydraulic lock is in the unlocked state (i.e., the open state).

[0032] For the plug-in type hydraulic lock of this embodiment, its opening and closing pressures can be adjusted by the adjusting screw 6, and tightened and loosened by the fastening screw 8.

[0033] Assume that there is a large load pressure at port A or port B. At this time, the plug-in type hydraulic lock of this embodiment is closed, and the PEEK gasket 102 of the valve body assembly 1 forms a highly reliable seal with the valve core 3 in a non-metal and metal combination, and can maintain a small leakage for a long time.

[0034] Such as Figure 2 , the sealing surface of the PEEK gasket 102 is designed with an arc angle to ensure a long working life when the PEEK gasket 102 cooperates with the valve core 3.

[0035] Such as Figure 3 , the valve core 3 includes a front end 301, a middle end 302, and a rear end 303 connected in sequence. The front end 301 is connected to the control piston 2, and the rear end 303 is connected to the spring 4; the radial dimension of the front end 301 and the radial dimension of the rear end 303 are both larger than the radial dimension of the middle end 302, that is, the valve core 3 is overall in a dumbbell shape;

[0036] Define the end face of the front end 301 facing the rear end as face C, and the end face of the rear end 303 facing the front end as face D. The area of face D is slightly larger than the area of face C (that is, there is a section difference between face C and face D), and it can open automatically when there is a fault at the control port of the housing assembly 1 or the control piston 2 is stuck.

[0037] The rear end 303 is provided with a cavity 304. The rear end 303 is inserted into the guide sleeve 5. One end of the spring 4 is inserted into the cavity 304 of the rear end 303, and the other end of the spring 4 contacts the adjusting screw 6.

[0038] The control piston 2 and the guide sleeve 5 are designed with long guides, effectively avoiding the inclination of the spring 4 during operation.

[0039] The cartridge - type hydraulic lock of this embodiment can be normally opened when the opening pressure of the control port fluctuates, and can maintain a small leakage under a certain pressure for a long time when blocking the oil circuit. It has the ability to resist pressure - fluctuation interference, realizes the function of high - reliable locking in case of failure opening, and improves the reliability of the hydraulic system.

Claims

1. A plug-in hydraulic lock, characterized in that: It includes a housing assembly and a valve core; the housing assembly includes a housing and a PEEK gasket; The valve core is placed in the housing, and the PEEK gasket is embedded in the groove of the inner wall of the housing through interference fit, so that the PEEK gasket and the valve core form a sealing pair; The valve core is dumbbell-shaped as a whole and is designed with a cross-sectional difference.

2. A plug-in hydraulic lock as claimed in claim 1, characterized in that: The valve core includes a front end, a middle end and a rear end connected in sequence, and the radial dimensions of the front end and the rear end are both larger than the radial dimensions of the middle end; the end face of the front end facing the rear end is defined as the C face, and the end face of the rear end facing the front end is defined as the D face, and the area of ​​the D face is slightly larger than the area of ​​the C face. When the control port of the housing assembly fails or the control piston is stuck, it can open automatically.

3. A plug-in hydraulic lock as claimed in claim 2, characterized in that: The plug-in hydraulic lock also includes a spring, a guide sleeve, an adjusting screw, a locking nut and a fastening nut; The control piston is placed in the housing; one end of the guide sleeve is inserted into the housing; one end of the valve core is connected to the control piston, and the other end of the valve core is inserted into the guide sleeve; The spring and the adjusting screw are placed in the guide sleeve, one end of the spring contacts the valve core, and the other end of the spring contacts the adjusting screw, and the adjusting screw is fastened by the fastening screw; the guide sleeve is fixedly connected to the housing by the locking nut.

4. A plug-in hydraulic lock as claimed in claim 3, characterized in that: The opening and closing pressure of the plug-in hydraulic lock is adjusted by the adjusting screw, and tightened and loosened by the tightening screw.

5. A plug-in hydraulic lock as claimed in claim 3, characterized in that: A cavity is provided at the rear end of the valve core, the rear end is inserted into the guide sleeve, and one end of the spring is inserted into the cavity at the rear end.

6. A plug-in hydraulic lock as claimed in claim 1, characterized in that: The sealing surface of the PEEK gasket is designed with an arc angle.

7. A plug-in hydraulic lock as claimed in claim 3, characterized in that: The control piston and the guide sleeve are designed as long guides.

8. A plug-in hydraulic lock as claimed in claim 3, characterized in that: The adjusting screw squeezes the spring and applies a leftward force to the spring; when there is no external force at the control port, under the action of the spring, the valve core contacts and squeezes the PEEK gasket, and the cartridge hydraulic lock is in a locked state; when a rightward force is applied from the control port, the force pushes the control piston to the right, driving the valve core to move to the right together to overcome the spring elastic force, and the valve core is out of contact with the PEEK gasket, and the cartridge hydraulic lock is in an unlocked state.

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