A flushing valve and its hydraulic motor

Abstract

This utility model relates to the field of hydraulic technology, specifically to a flushing valve and a hydraulic motor. A flushing valve includes: a hollow flushing valve core, slidably mounted in a first mounting cavity, the first mounting cavity being divided into an inlet cavity and an outlet cavity, the flushing valve controlling the connection between the inlet and outlet cavities; the flushing valve core having a communicating inlet and outlet hole; a sealing element located in the outlet cavity, the outer surface of the flushing valve core slidingly engaging with the inlet cavity, and the inner surface of the flushing valve core slidingly engaging with the sealing element; and an elastic element, initially, under the action of the elastic element, the outlet hole is blocked by the inner wall of the inlet cavity; when low-pressure oil is introduced into the inlet cavity, the flushing valve core slides until the outlet hole communicates with the outlet cavity; when high-pressure oil is introduced into the inlet cavity, the flushing valve core continues to slide until the outlet hole is blocked by the sealing element. This solves the technical problem in the prior art where, during a passive emergency stop of the hydraulic motor, high-pressure oil easily damages the shaft seal of the hydraulic motor, leading to external leakage of hydraulic oil.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to a flushing valve and a hydraulic motor. Background Technology

[0002] Hydraulic motors are high-end hydraulic components, mainly used in engineering machinery, agricultural machinery, construction machinery, marine and port machinery, and industrial equipment. A hydraulic motor converts the liquid pressure energy provided by a hydraulic pump into the mechanical energy of the output shaft. When operating in a closed hydraulic system with a closed-loop hydraulic pump, the hydraulic motor needs a flushing valve to flush the high-temperature working oil into the oil tank for cooling and filtration (returning to the oil tank through the motor's housing).

[0003] For example, application number CN202123320180.6 discloses a heat dissipation flushing valve with controllable oil replenishment pressure, including a valve body. The valve body has a first inner cavity and a second inner cavity, which are connected. The valve body has a flushing assembly and a pressure holding assembly. The flushing assembly is located in the first inner cavity. The flushing assembly includes a flushing valve core and a flushing spring. The two ends of the flushing valve core are mounted by the flushing spring. Spring seats are respectively provided on the shoulders of the two ends of the flushing valve core. One end of the flushing spring is mounted on the spring seat, and the other end of the flushing spring is abutted on a first hexagonal screw plug. The first hexagonal screw plug is threadedly connected to the valve body and sealed by a first O-ring. The pressure-holding assembly includes a pressure-holding valve core and a pressure-holding spring. The pressure-holding valve core is disposed in the second inner cavity via the pressure-holding spring. The pressure-holding valve core is clearance-fitted with the valve body. One shoulder of the pressure-holding valve core presses against the inner cavity step of the second inner cavity, and the other shoulder is connected to one end of the pressure-holding spring. The other end of the pressure-holding spring is mounted on a second hexagonal screw plug, which is threaded to the valve body and sealed by a second O-ring. The pressure-holding valve core is a hollow core with one open end. The opening of the inner cavity of the pressure-holding valve core faces the D cavity. The pressure-holding valve core has a radial hole L, which is circumferentially disposed on the pressure-holding valve core and penetrates the inner cavity of the pressure-holding valve core. When the return oil pressure is higher than the set pressure-holding pressure, the hydraulic pressure in the D cavity overcomes the spring force of the pressure-holding spring, and the pressure-holding valve core moves upward to achieve reversal. The hydraulic oil passes through the throttling orifice K, then through the throttling orifice J and the radial hole L on the pressure-holding valve core to achieve heat dissipation and flushing functions.

[0004] When the aforementioned flushing valve is working normally, it can flush the hydraulic motor. However, when the hydraulic motor experiences a passive emergency stop during operation (such as when the working device driven by the hydraulic motor is jammed by a foreign object during operation), the pressure at ports A and B of the hydraulic motor will be reversed. That is, port B, which was originally low pressure, becomes high pressure due to the emergency stop of the hydraulic motor. When port B of the hydraulic motor becomes high pressure instantaneously, the reversing valve core of the flushing valve cannot close port B in time. This causes the high-pressure oil at port B to flush into the housing cavity of the hydraulic motor instantly. The return oil pressure in the housing cavity will increase instantaneously, thereby damaging the shaft seal of the hydraulic motor and causing hydraulic oil to leak out. Utility Model Content

[0005] To address the technical problem in existing technologies where high-pressure oil can easily damage the shaft seal of a hydraulic motor during a passive emergency stop, leading to hydraulic oil leakage, this invention provides a flushing valve and a hydraulic motor, thus solving the aforementioned technical problem.

[0006] To solve the above-mentioned technical problems, this utility model provides a flushing valve, comprising: The flushing valve core is a hollow valve core, which is slidably assembled in the first mounting cavity. The first mounting cavity is divided into an oil inlet cavity and an oil outlet cavity. The flushing valve controls the opening and closing between the oil inlet cavity and the oil outlet cavity. The flushing valve core has a communicating oil inlet hole and an oil outlet hole. The oil inlet hole is connected to the oil inlet cavity, and the oil outlet hole is a radial hole. A sealing element is located in the oil outlet chamber. The outer surface of the flushing valve core is in sliding fit with the oil inlet chamber, and the inner surface of the flushing valve core is in sliding fit with the sealing element. An elastic element acts on the flushing valve core. In the initial state, under the action of the elastic element, the oil outlet is blocked by the inner wall of the oil inlet chamber. When low-pressure oil is introduced into the oil inlet chamber, the flushing valve core slides until the oil outlet communicates with the oil outlet chamber. When high-pressure oil is introduced into the oil inlet chamber, the flushing valve core continues to slide until the oil outlet is blocked by the sealing element.

[0007] According to one embodiment of the present invention, the inner diameter of the oil outlet chamber is larger than the inner diameter of the oil inlet chamber, and a stepped surface is formed between the oil inlet chamber and the oil outlet chamber.

[0008] According to one embodiment of the present invention, the outer surface of the flushing valve core is formed with an external protrusion, the oil inlet and the oil outlet are located on the same side of the external protrusion, and under the action of the elastic element, the external protrusion is pressed against the stepped surface.

[0009] According to one embodiment of the present invention, the oil outlet is located closer to the outer protrusion than the oil inlet, and the oil outlet is tangent to the outer protrusion.

[0010] According to one embodiment of the present invention, an axial through hole is formed in the center of the flushing valve core, and a damping pad is fitted at the first end of the flushing valve core located in the oil inlet chamber, with the oil inlet hole formed in the middle of the damping pad.

[0011] According to one embodiment of the present invention, the sealing member extends from the second end of the flushing valve core, and there is an axial gap between the end face of the sealing member located inside the flushing valve core and the stepped surface.

[0012] According to one embodiment of the present invention, the sealing member is assembled inside the first threaded sleeve and protrudes from the first threaded sleeve. The open end of the first threaded sleeve cooperates with the stepped surface to limit the movement range of the outer protrusion. When the outer protrusion abuts against the open end of the first threaded sleeve, the oil outlet is completely blocked by the sealing member.

[0013] According to one embodiment of the present invention, an oil groove is provided on the outer protrusion.

[0014] According to one embodiment of the present invention, it further includes a reversing valve core, which is slidably installed in the second mounting cavity. The reversing valve core reverses under the oil pressure of the two working oil ports, controlling the lower pressure oil in the two working oil ports to enter the oil inlet cavity.

[0015] This utility model also provides a hydraulic motor, comprising: case; End caps, fixed to the housing; A flushing valve is installed inside the end cap.

[0016] Based on the above technical solution, the technical effects that this utility model can achieve are as follows: 1. The flushing valve of this utility model, by setting the flushing valve core as a hollow valve core, and the flushing valve core slidingly engaging with the oil inlet chamber and the sealing component respectively, when the flushing valve is working normally, the low-pressure oil entering the oil inlet chamber can push the flushing valve core to open, connecting the oil inlet and oil outlet of the flushing valve core, thereby connecting the oil inlet chamber and the oil outlet chamber, allowing the low-pressure oil to enter the oil outlet chamber and then flow into the hydraulic motor to play a flushing role; once the hydraulic motor is stuck by foreign objects during operation, high-pressure oil enters the oil inlet chamber, and the high-pressure oil will push the flushing valve core to slide a large distance, the sealing component will block the oil outlet, disconnecting the connection between the oil inlet and oil outlet of the flushing valve core, and the high-pressure oil cannot enter the oil outlet chamber, and therefore will not enter the hydraulic motor, thus avoiding the situation where high-pressure oil damages the shaft seal of the hydraulic motor, leading to external leakage of hydraulic oil; 2. In the flushing valve of this utility model, the inner diameter of the oil outlet chamber is larger than that of the oil inlet chamber, and a stepped surface is formed between the oil inlet chamber and the oil outlet chamber. When the flushing valve core, under the action of the elastic element, has its outer protrusion abutting against the stepped surface, the oil outlet of the flushing valve core is blocked by the inner wall of the oil inlet chamber. When the flushing valve core slides a short distance under the action of low-pressure oil, the outer protrusion of the flushing valve core leaves the stepped surface, and when the oil outlet of the flushing valve core slides into the oil outlet chamber, it can communicate with the oil outlet chamber. In addition, a first threaded sleeve is also provided, so that the outer protrusion of the flushing valve core can slide to abut against the stepped surface under the action of high-pressure oil. At the open end of the first threaded sleeve, when the outer protrusion of the flushing valve core abuts against the first threaded sleeve, the oil outlet of the flushing valve core is completely blocked by the sealing component. In this way, the stepped surface and the first threaded sleeve cooperate to limit the movement range of the outer protrusion, thereby limiting the movement range of the flushing valve core. In order to avoid the formation of a closed space inside the first threaded sleeve when the outer protrusion of the flushing valve core abuts against the open end of the first threaded sleeve, which would affect the force on the flushing valve core, the flushing valve of this application is provided with an oil groove on the outer protrusion to ensure the flow of oil on both sides of the outer protrusion, so that a closed space is not formed inside the first threaded sleeve. 3. In the flushing valve of this utility model, the center of the flushing valve core forms an axial through hole, and a damping pad is provided at the end. The center of the damping pad forms an oil inlet hole, so the oil introduced into the oil inlet chamber can act on the flushing valve core and push the flushing valve core to move. Some of the oil can enter the axial through hole through the oil inlet hole; the oil outlet hole is a radial hole, so the axial through hole can connect the oil inlet hole and the oil outlet hole. 4. In the flushing valve of this utility model, when the flushing valve core is subjected to the force of low-pressure oil, the oil outlet on it is located between the end face of the sealing element and the stepped surface, and the oil inlet chamber can be connected to the oil outlet chamber through the flushing valve core; when the flushing valve core is subjected to the force of high-pressure oil, the oil outlet on it will be completely blocked by the sealing element, and the high-pressure oil in the oil inlet chamber cannot flow to the oil outlet chamber. 5. In this utility model, the hydraulic motor has a flushing valve mounted on the end cover. The reversing valve core reverses under the oil pressure of the two working ports, controlling the lower pressure oil in the two working ports to enter the inlet chamber. The low-pressure oil pushes the flushing valve core to slide. The oil outlet is located between the end face of the sealing component and the stepped surface. The low-pressure oil can enter the outlet chamber through the flushing valve core, and then flow into the housing through the drain hole in the end cover to flush the inside of the housing. When the hydraulic motor is passively stopped during operation (such as when the working device driven by the hydraulic motor is stuck by a foreign object during operation), the oil in the working port that is normally low pressure oil changes direction. The pressure instantly transforms into high-pressure oil. However, the movement of the directional valve core is delayed, and the valve port opened by the directional valve core cannot close in time. At this moment, a large amount of high-pressure oil enters the oil inlet chamber. The high-pressure oil pushes the flushing valve core to overcome the resistance of the elastic element. Due to the greater thrust of the high-pressure oil, the stroke of the flushing valve core is longer than that of the low-pressure oil. When the stroke of the flushing valve core exceeds the set stroke, the sealing element extending into the flushing valve core just blocks the oil outlet of the flushing valve core. Thus, the high-pressure oil cannot be flushed into the housing of the hydraulic motor through the flushing valve core and the drain hole, and the shaft seal of the hydraulic motor will not be damaged. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the hydraulic motor of this utility model at the flushing valve; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 for Figure 1 Enlarged view of part B; Figure 4 This is a cross-sectional view of a hydraulic motor. Figure 5 This is a schematic diagram of the flushing valve core. Figure 6 This is a cross-sectional view of the flushing valve core; Figure 7 This is a schematic diagram of the sealing component; In the diagram: 1-Flush valve core; 11-Damping gasket; 111-Oil inlet; 12-Oil outlet; 13-Axial through hole; 14-Outer protrusion; 141-Oil groove; 15-Retaining ring; 2-Sealing component; 3-Elastic component; 4-First threaded sleeve; 5-Reversing valve core; 51-First annular groove; 52-Second annular groove; 53-Flow groove; 6-Spring; 7-Second threaded sleeve; 81-First gasket; 82-Second gasket; 9-Housing; 91-Shaft seal; 10-End cap; 101-First mounting cavity; 1011-Oil inlet cavity; 1012-Oil outlet cavity; 1013-Step surface; 102-Second mounting cavity; 103-First oil passage; 104-Second oil passage; 105-First working oil port; 106-Second working oil port; 107-Drain hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] like Figure 1-7 As shown, this embodiment provides a flushing valve for a hydraulic motor, including a flushing valve core 1, a sealing element 2, and an elastic element 3. The flushing valve core 1 is assembled in a first mounting cavity 101, which is divided into an oil inlet cavity 1011 and an oil outlet cavity 1012. The sealing element 2 and the elastic element 3 are located in the oil outlet cavity 1012. The flushing valve core 1 is slidably engaged with the oil inlet cavity 1011 and the sealing element 2. The elastic element 3 acts on the flushing valve core 1. Under the oil pressure in the oil inlet cavity 1011 and the action of the elastic element 3, the flushing valve core 1 slides to control the opening and closing between the oil inlet cavity 1011 and the oil outlet cavity 1012.

[0025] The first mounting cavity 101 is axially divided into an oil inlet cavity 1011 and an oil outlet cavity 1012. The inner diameter of the oil outlet cavity 1012 is smaller than the inner diameter of the oil inlet cavity 1011. A stepped surface 1013 is formed between the oil inlet cavity 1011 and the oil outlet cavity 1012.

[0026] The flushing valve core 1 is a hollow valve core with an axial through hole 13 at its center. An oil inlet hole 111 and an oil outlet hole 12 are formed on the flushing valve core 1, and the oil inlet hole 111 and the oil outlet hole 12 are connected through the axial through hole 13. When the flushing valve core 1 is assembled in the first mounting cavity 101, the oil inlet hole 111 remains connected to the oil inlet cavity 1011, and the connection between the oil outlet hole 12 and the oil outlet cavity 1012 depends on the position of the flushing valve core 1.

[0027] In a preferred embodiment, the first end of the flushing valve core 1 extends into the oil inlet chamber 1011, and the oil inlet hole 111 is located at the port of the first end of the flushing valve core 1. Specifically, a damping pad 11 is provided at the opening of the axial through hole 13 of the flushing valve core 1, and the oil inlet hole 111 is formed at the center of the damping pad 11. Preferably, the damping pad 11 is limited and assembled at the opening of the axial through hole 13 by a retaining ring 15. Preferably, the damping pad 11 is replaceable, and damping pads 11 with different sizes of oil inlet holes 111 can be selected according to requirements to meet the flushing flow requirements.

[0028] As a preferred technical solution in this embodiment, the oil outlet 12 of the flushing valve core 1 is a radial hole, and the oil outlet 12 can be set to at least two, with at least two oil outlets 12 located in the same circumferential direction, preferably evenly arranged.

[0029] As a preferred technical solution in this embodiment, an outer protrusion 14 is formed on the outer surface of the flushing valve core 1, which is used to cooperate with the stepped surface 1013 to limit the position of the flushing valve core 1. The outer protrusion 14 can be an annular protrusion, and annular planes are formed on both axial sides of the annular protrusion, which facilitates the fit and sealing between it and the stepped surface 1013, and also facilitates the cooperation with the elastic member 3.

[0030] As a preferred embodiment, the oil inlet 111 and the oil outlet 12 are both located on the same side of the outer protrusion 14, with the oil outlet 12 positioned close to the outer protrusion 14. Preferably, the oil outlet 12 is tangent to the outer protrusion 14, and the oil outlet 12 is tangent to the end face of the outer protrusion 14 closest to the oil outlet 12. In this way, the flushing valve core 1 can slide against the force of the elastic element 3 under the pushing action of low-pressure oil, thereby connecting the oil inlet chamber 1011 and the oil outlet chamber 1012.

[0031] The sealing element 2 is a cylindrical body located in the oil outlet chamber 1012. The sealing element 2 extends from the second end of the flushing valve core 1 and slides with the inner surface of the flushing valve core 1. Specifically, there is an axial gap between the end face of the sealing element 2 and the stepped surface 1013 of the flushing valve core 1.

[0032] As a preferred technical solution in this embodiment, in order to facilitate processing, the first mounting cavity 101 is generally extended to the outer surface to form an opening. The opening can be sealed by assembling the first threaded sleeve 4, and the sealing member 2 can be assembled on the inner bottom surface of the first threaded sleeve 4.

[0033] The elastic element 3 acts on the flushing valve core 1. The elastic element 3 can be sleeved on the sealing element 2 and part of the flushing valve core 1, and acts on the outer protrusion 14 on the flushing valve core 1. In the initial state, under the action of the elastic element 3, the outer protrusion 14 abuts against the stepped surface 1013, and the oil outlet 12 is blocked by the inner wall of the oil inlet chamber 1011. At this time, the oil inlet chamber 1011 and the oil outlet chamber 1012 are not connected. When low-pressure oil is introduced into the oil inlet chamber 1011, the low-pressure oil pushes the flushing valve core 1 to slide a small distance, and the oil outlet 12 is located between the stepped surface 1013 and the end face of the sealing element 2. The oil outlet 12 is connected to the oil outlet chamber 1012. At this time, the oil inlet chamber 1011 is connected to the oil outlet chamber 1012 through the flushing valve core 1. When high-pressure oil is introduced into the oil inlet chamber 1011, the high-pressure oil pushes the flushing valve core 1 to slide a large distance, and the oil outlet 12 will be blocked by the sealing element 2. At this time, the oil inlet chamber 1011 and the oil outlet chamber 1012 are disconnected.

[0034] As a preferred embodiment, the elastic element 3 is a spring; the inner bottom surface of the first threaded sleeve 4 is provided with a plurality of first washers 81, one end of the elastic element 3 abuts against the first washers 81, and the other end of the elastic element 3 abuts against the outer protrusion 14. The preload of the elastic element 3 can be adjusted by adjusting the thickness and / or number of the first washers 81; when there are at least two first washers 81, they are stacked.

[0035] As a preferred embodiment, the open end of the first threaded sleeve 4 is located inside the oil outlet chamber 1012, and the open end of the first threaded sleeve 4 can cooperate with the outer protrusion 14. When high-pressure oil is introduced into the oil inlet chamber 1011, the high-pressure oil can push the flushing valve core 1 to slide until the outer protrusion 14 abuts against the open end of the first threaded sleeve 4. At this time, the oil outlet 12 is completely blocked by the sealing member 2, and the elastic member 3 is completely placed in the spring cavity formed by the first threaded sleeve 4 and the outer protrusion 14. The first threaded sleeve 4 and the stepped surface 1013 can cooperate to limit the movement range of the outer protrusion 14, thereby limiting the movement range of the flushing valve core 1. Preferably, in order to avoid the spring cavity being a closed cavity and being compressed, affecting the force on the flushing valve core 1, an oil groove 141 is provided on the outer protrusion 14 to facilitate the communication between the spring cavity and the external oil outlet chamber 1012.

[0036] The flushing valve also includes a reversing valve core 5, which is assembled in the second mounting cavity 102. The second mounting cavity 102 is connected to the first mounting cavity 101. The reversing valve core 5 is in the neutral position under the action of the spring. The reversing valve core 5 reverses under the oil pressure of the two working oil ports, controlling the lower pressure oil in the two working oil ports to enter the oil inlet cavity 1011 of the first mounting cavity 101.

[0037] For ease of processing, the second mounting cavity 102 can be configured as a through hole structure, and the two ends of the second mounting cavity 102 are respectively provided with second threaded sleeves 7 to form a seal.

[0038] As a preferred technical solution of this embodiment, the first mounting cavity 101 and the second mounting cavity 102 are vertically connected. Preferably, one end of the first mounting cavity 101 is connected to the approximate middle position of the second mounting cavity 102.

[0039] The reversing valve core 5 is slidably assembled in the second mounting cavity 102. A first annular groove 51 and a second annular groove 52 are formed on the outer peripheral surface of the reversing valve core 5. The first annular groove 51 introduces the oil pressure from the first working oil port 105, and the second annular groove 52 introduces the oil pressure from the second working oil port 106. The oil pressure from the two working oil ports then enters the cavities at both ends of the reversing valve core 5 through gaps or oil passages, causing the reversing valve core 5 to slide. The lower pressure oil in the two working oil ports can communicate with the oil inlet cavity 1011 of the first mounting cavity 101 through the flow groove 53 of the reversing valve core 5.

[0040] As a preferred embodiment, springs 6 are respectively provided at both ends of the reversing valve core 5, and the reversing valve core 5 is in a neutral position under the action of the springs 6 at both ends. Specifically, a second gasket 82 is provided at both ends of the reversing valve core 5 for limiting, and the spring 6 is located between the second threaded sleeve 7 and the second gasket 82. The two ends of the spring 6 act on the second threaded sleeve 7 and the second gasket 82 respectively.

[0041] As a preferred embodiment, the first annular groove 51 and the second annular groove 52 are symmetrically arranged on both sides of the flow channel 53; the first working oil port 105 is connected to the first annular groove 51 through the first oil passage 103, and the second working oil port 106 is connected to the second annular groove 52 through the second oil passage 104. Preferably, the first oil passage 103 and the second oil passage 104 are symmetrically distributed on both sides of the first mounting cavity 101.

[0042] As a preferred embodiment, the first annular groove 51 and the second annular groove 52 are respectively located at both ends of the reversing valve core 5. A flow gap can be provided between the reversing valve core 5 and the second mounting cavity 102 to allow oil from the first annular groove 51 to flow into one end cavity of the reversing valve core 5, and oil from the second annular groove 52 to flow into the other end cavity of the reversing valve core 5. Alternatively, internal oil passages can be provided at both ends of the reversing valve core 5 to facilitate the flow of oil from the first annular groove 51 into one end cavity of the reversing valve core 5, and oil from the second annular groove 52 into the other end cavity of the reversing valve core 5. Other configurations are also acceptable, as long as they allow oil from the two annular grooves to enter the two end cavities of the reversing valve core 5 respectively.

[0043] This embodiment also provides a hydraulic motor, including a housing 9 and an end cover 10. The end cover 10 is fixed to the housing 9. A rotating body is installed in the housing cavity formed by the end cover 10 and the housing 9. A main shaft is rotatably assembled on the housing 9. One end of the main shaft is located inside the housing 9 and cooperates with the rotating body. The other end of the main shaft extends out of the housing 9. A shaft seal 91 is provided between the main shaft and the housing 9.

[0044] A flushing valve is provided on the end cover 10. The first mounting cavity 101, the second mounting cavity 102, the first working oil port 105, the second working oil port 106, the first oil passage 103 and the second oil passage 104 are all provided inside the end cover 10. An oil drain hole 107 is also provided inside the end cover 10, which connects the oil outlet cavity 1012 and the housing cavity.

[0045] Based on the above technical solution, taking the normal working state where high-pressure oil enters through the first working port 105 and low-pressure oil exits through the second working port 106 as an example, the working process of the hydraulic motor in this embodiment is as follows: When the hydraulic motor is working normally, high-pressure oil enters through the first working port 105 and low-pressure oil exits through the second working port 106. The high-pressure oil from the first working port 105 is introduced into the left end of the reversing valve core 5 through the first oil passage 103 and the first annular groove 51, pushing the reversing valve core 5 to move to the right. At this time, the second oil passage 104 and the oil inlet chamber 1011 of the first mounting cavity 101 are connected through the flow groove 53 of the reversing valve core 5. The low-pressure oil from the second working port 106 enters the oil inlet chamber 1011. The low-pressure oil pushes the flushing valve core 1 to overcome the resistance of the elastic element 3 and make the flushing valve core 1 move downward. The oil outlet 12 of the flushing valve core 1 is connected to the oil outlet chamber 1012. The low-pressure oil can flow to the oil outlet chamber 1012 and then flush into the housing cavity through the drain hole 107. The entire working process of the flushing valve is completed.

[0046] When the hydraulic motor is passively stopped during operation (such as when the hydraulic motor-driven working device is jammed by a foreign object during operation), the oil in the second working port 106, which was originally low-pressure oil, instantly becomes high-pressure oil due to pressure buildup. The leftward movement of the directional valve core 5 is delayed, and the valve port on the right side of the directional valve core 5 cannot close in time. At this moment, a large amount of high-pressure oil enters the inlet chamber 1011 of the first mounting chamber 101. The high-pressure oil pushes the flushing valve core 1 to overcome the resistance of the elastic element 3, causing the flushing valve core 1 to move downwards. Due to the high pressure... The thrust of the high-pressure oil is relatively large, and the downward stroke of the flushing valve core 1 is longer than that of the low-pressure oil. When the downward stroke of the flushing valve core 1 exceeds the set stroke, the outer protrusion 14 of the flushing valve core 1 is limited by the open end of the first threaded sleeve 4. The sealing part 2 installed in the hole of the flushing valve core 1 just blocks the oil outlet hole 12 of the flushing valve core 1, so the high-pressure oil cannot enter the oil outlet chamber 1012 through the flushing valve core 1, and therefore cannot be flushed into the housing cavity through the drain hole 107. In this way, the shaft seal 91 of the hydraulic motor will not be damaged.

[0047] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A flush valve characterized by, include: The flushing valve core (1) is a hollow valve core. The flushing valve core (1) is slidably assembled in the first mounting cavity (101). The first mounting cavity (101) is divided into an oil inlet cavity (1011) and an oil outlet cavity (1012). The flushing valve controls the opening and closing between the oil inlet cavity (1011) and the oil outlet cavity (1012). The flushing valve core (1) has a communicating oil inlet hole (111) and an oil outlet hole (12). The oil inlet hole (111) is connected to the oil inlet cavity (1011). The oil outlet hole (12) is a radial hole. The sealing element (2) is located in the oil outlet chamber (1012). The outer surface of the flushing valve core (1) is in sliding fit with the oil inlet chamber (1011), and the inner surface of the flushing valve core (1) is in sliding fit with the sealing element (2). The elastic element (3) acts on the flushing valve core (1). In the initial state, under the action of the elastic element (3), the oil outlet (12) is blocked by the inner wall of the oil inlet chamber (1011). When low-pressure oil is introduced into the oil inlet chamber (1011), the flushing valve core (1) slides to the oil outlet (12) and communicates with the oil outlet chamber (1012). When high-pressure oil is introduced into the oil inlet chamber (1011), the flushing valve core (1) continues to slide until the oil outlet (12) is blocked by the blocking element (2).

2. A flush valve according to claim 1, wherein The inner diameter of the oil outlet chamber (1012) is larger than the inner diameter of the oil inlet chamber (1011), and a stepped surface (1013) is formed between the oil inlet chamber (1011) and the oil outlet chamber (1012).

3. A flush valve according to claim 2, wherein The outer surface of the flushing valve core (1) has an outer protrusion (14). The oil inlet (111) and the oil outlet (12) are located on the same side of the outer protrusion (14). Under the action of the elastic element (3), the outer protrusion (14) is pressed against the stepped surface (1013).

4. A flush valve according to claim 3, wherein The oil outlet (12) is located closer to the outer protrusion (14) than the oil inlet, and the oil outlet (12) is tangent to the outer protrusion (14).

5. A flush valve according to claim 2, wherein An axial through hole (13) is formed in the center of the flushing valve core (1), and a damping pad (11) is fitted at the first end of the flushing valve core (1) located in the oil inlet chamber (1011), and the oil inlet hole (111) is formed in the middle of the damping pad (11).

6. A flush valve according to claim 2, wherein The sealing element (2) extends from the second end of the flushing valve core (1), and there is an axial gap between the end face of the sealing element (2) inside the flushing valve core (1) and the stepped surface (1013).

7. A flush valve according to claim 3, wherein The sealing member (2) is assembled inside the first threaded sleeve (4) and protrudes from the first threaded sleeve (4). The open end of the first threaded sleeve (4) cooperates with the stepped surface (1013) to limit the movement range of the outer protrusion (14). When the outer protrusion (14) abuts against the open end of the first threaded sleeve (4), the oil outlet (12) is completely blocked by the sealing member (2).

8. A flush valve according to claim 7, wherein An oil groove (141) is provided on the outer protrusion (14).

9. The flush valve of claim 1 wherein, It also includes a reversing valve core (5), which is slidably installed in the second mounting cavity (102). The reversing valve core (5) is reversed under the oil pressure of the two working oil ports, controlling the lower pressure oil in the two working oil ports to enter the oil inlet cavity (1011).

10. A hydraulic motor characterized by, include: Shell (9); End cap (10) is fixed to the housing (9); The flushing valve according to any one of claims 1-9 is installed inside the end cap (10).

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