Control valve, control valve group capable of reducing oil return resistance and working method thereof

Abstract

This application discloses a control valve component, a control valve assembly capable of reducing return oil resistance, and its operating method. The control valve assembly capable of reducing return oil resistance includes a main valve component, a control valve component, and a pilot valve. The main valve component includes a main valve body and a main valve core. The control valve component includes a control valve body, a control valve core, and two second elastic elements. The control valve body also has two first connecting holes, two second connecting holes, and a first return oil passage. The pilot valve includes a pilot valve body and a pilot valve core. The pilot valve body has a pilot valve cavity, two connecting holes, an inlet oil passage, and a second return oil passage. This application utilizes the cooperative action of the control valve component, the main valve component, and the pilot valve to divert and return the hydraulic oil discharged from the main valve component. Compared to a direct connection between the main valve component and the pilot valve, this method utilizes only the second return oil passage of the pilot valve for return oil, reducing the return oil resistance. This reduces the resistance when the main valve core moves, increases the switching speed, and effectively improves the response speed of the main valve component.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to control valve components, control valve assemblies that can reduce return oil resistance, and their operating methods. Background Technology

[0002] In a hydraulic system, control valves are responsible for regulating the direction, pressure, and flow rate of fluid. A control valve typically consists of a main valve and a pilot valve. The pilot valve is installed on the main valve and supplies hydraulic oil to the main valve. This hydraulic oil drives the main valve spool of the main valve to change the direction of the fluid flowing through the main valve. Simultaneously, the hydraulic oil expelled from the main valve by the main valve spool flows back to the oil tank through the return port of the pilot valve.

[0003] During this process, because the hydraulic oil returns only through the pilot valve's return port, the return resistance is relatively high, while the return flow rate is also relatively large. The hydraulic oil inside the main valve component, subjected to the pressure of the main valve core, cannot be discharged quickly, resulting in greater resistance when the main valve core moves, a longer switching time, and thus affecting the response speed of the main valve component. Furthermore, due to the high return resistance, more energy is required to deliver the hydraulic oil to move the main valve core, and some of this resistance is converted into heat, causing the hydraulic oil temperature to rise. This accelerates hydraulic oil aging and affects the sealing performance of the control valve. Excessive return resistance can also cause turbulence and pressure fluctuations, generating significant noise and mechanical vibration. Summary of the Invention

[0004] To solve the above-mentioned technical problems and achieve at least one advantage of this application, this application provides a control valve, the control valve comprising:

[0005] The control valve body has two spaced-apart hydraulic chambers, and also has two first connecting holes, two second connecting holes, and a first return oil passage;

[0006] A control valve core is installed in the control valve body with its two ends respectively placed in the two hydraulic chambers. The control valve core has two radial holes spaced apart along its axial direction, and the portion of the control valve core between the two radial holes forms a flow supply gap with the inner wall of the control valve body. Both ends of the control valve core form axial holes communicating with the radial holes on the same side, and the end of each axial hole away from the corresponding radial hole communicates with a hydraulic chamber. The control valve core is configured to slide within the control valve body so that one end moves in the direction of withdrawal from the corresponding hydraulic chamber and the other end moves in the direction of insertion into the corresponding hydraulic chamber. When the pressure on both ends of the control valve core is the same, each of the first connecting holes passes through a... The radial hole communicates with a second connection hole, and the control valve core isolates the first connection hole, the second connection hole, and the first return oil passage. When hydraulic oil is introduced into either of the two first connection holes, the hydraulic oil flows through the radial hole communicating with the corresponding first connection hole and is diverted to the second connection hole communicating with the corresponding radial hole. A portion of the hydraulic oil flows into the corresponding oil pressure chamber through the axial hole communicating with the corresponding radial hole. The hydraulic oil in the corresponding oil pressure chamber pushes the control valve core to slide in the control valve body in the direction of being pulled out of the corresponding oil pressure chamber, so that the other first connection hole communicates with the other second connection hole through the supply gap, and the other second connection hole communicates with the first return oil passage through the supply gap.

[0007] Two second elastic elements are provided, each of which is disposed in a hydraulic chamber and its two ends are respectively connected to the inner wall of the corresponding hydraulic chamber, and the control valve core is placed at one end of the corresponding hydraulic chamber.

[0008] To solve the aforementioned technical problems and achieve at least one advantage of this application, this application provides a control valve assembly capable of reducing return oil resistance, the control valve assembly comprising:

[0009] Control valves as described above;

[0010] The main valve component includes a main valve body and a main valve core. The main valve body has a main valve cavity and two side pressure chambers located at both ends of the main valve cavity and communicating with the main valve cavity. The main valve core is located in the main valve cavity and its two ends extend from the main valve cavity into the side pressure chambers respectively. The main valve core is configured to slide in the main valve cavity such that one end moves in the direction of being pulled out of the corresponding side pressure chamber and the other end moves in the direction of being extended into the other side pressure chamber. The main valve body also has two channels, each of which communicates with one of the side pressure chambers. The end of each channel away from the corresponding side pressure chamber communicates with a second connection hole.

[0011] A pilot valve includes a pilot valve body and a pilot valve core. The pilot valve body has a pilot valve cavity, two connection holes, an oil inlet passage, and a second oil return passage. The two connection holes are respectively connected to two first connection holes. The pilot valve core is installed in the pilot valve cavity. The pilot valve core is configured to move so that one of the two connection holes is connected to the oil inlet passage through the pilot valve cavity, and the other is connected to the second oil return passage through the pilot valve cavity. When the two ends of the pilot valve core are subjected to the same force, the pilot valve core isolates the two connection holes from the oil inlet passage and the second oil return passage.

[0012] According to one embodiment of this application, the main valve component includes two first elastic elements, each of which is located in a side pressure cavity and its two ends are respectively connected to the inner wall of the corresponding side pressure cavity. The main valve core is placed at one end of the corresponding side pressure cavity. The first elastic element undergoes elastic deformation when the main valve core is moved under force. The first elastic element can be reset when the external force applied to the main valve core is removed.

[0013] According to one embodiment of this application, the main valve body further has an inlet, at least one outlet, and two working ports. The main valve core moves within the main valve cavity so that one of the two working ports communicates with the inlet through the main valve cavity, while the other communicates with the outlet through the main valve cavity. When the pressure at both ends of the main valve core is consistent, the main valve core isolates the two working ports from the inlet and the outlet.

[0014] According to one embodiment of this application, the pilot valve further includes a control mechanism located at the end of the pilot valve core and installed in the pilot valve body. The control mechanism is configured to drive the pilot valve core to move within the pilot valve cavity.

[0015] According to one embodiment of this application, the control mechanism includes two control components, each including an electromagnetic coil and a pushing member. The electromagnetic coils of the two control components are mounted opposite to each other on the valve body. The two pushing members are located at both ends of the valve core, and each end away from the valve core is made of a soft magnetic material. The pushing member is movably disposed within the electromagnetic coil. When either of the two electromagnetic coils is energized, the corresponding pushing member is magnetized and moves toward the other electromagnetic coil to push the valve core to move within the valve cavity.

[0016] According to one embodiment of this application, the control mechanism further includes two third elastic members, the two ends of each third elastic member corresponding to one end of the pilot valve core and the pilot valve body, respectively. The third elastic member can undergo elastic deformation when the pilot valve core is driven to move in the pilot valve cavity, and the third elastic member can reset the pilot valve core when it is not subjected to external force.

[0017] According to one embodiment of this application, the first return oil passage is connected to the second return oil passage, and the main valve body also has an oil outlet hole, one end of which is connected to the oil tank, and the other end of which is connected to the second return oil passage.

[0018] According to one embodiment of this application, the main valve body has a first oil inlet hole, the control valve body has a second oil inlet hole, one end of the first oil inlet hole is connected to the second oil inlet hole, and one end of the second oil inlet hole away from the first oil inlet hole is connected to the oil inlet passage.

[0019] To solve the aforementioned technical problems and achieve at least one advantage of this application, this application provides a method for operating a control valve assembly that can reduce return oil resistance. The method for operating the control valve assembly that can reduce return oil resistance includes the following steps:

[0020] The pilot valve core is driven to move within the pilot valve cavity, such that one of the two connecting holes is connected to the oil inlet passage through the pilot valve cavity, and the other is connected to the second return passage through the pilot valve cavity. Hydraulic oil is introduced into the pilot valve cavity through the oil inlet passage and then flows to one of the connecting holes, thereby supplying hydraulic oil to the first connecting hole connected to the corresponding connecting hole.

[0021] Hydraulic oil flows through the radial hole communicating with the corresponding first connection hole and is split to flow partly to the second connection hole communicating with the corresponding radial hole and partly through the axial hole communicating with the corresponding radial hole into the corresponding oil pressure chamber. The hydraulic oil in the corresponding oil pressure chamber pushes the control valve core to slide in the control valve body in the direction of being pulled out of the corresponding oil pressure chamber, so that the other first connection hole communicates with the other second connection hole through the supply gap, and the other second connection hole communicates with the first return oil passage through the supply gap.

[0022] The second port, through which hydraulic oil is introduced, introduces hydraulic oil into the corresponding side pressure chamber via the channel communicating with the corresponding second port. The hydraulic oil pushes the main valve core within the main valve chamber to move in the direction of withdrawal from the corresponding side pressure chamber, thereby reversing the flow of fluid through the main valve body. Simultaneously, the main valve core extends into another side pressure chamber and squeezes the hydraulic oil within the corresponding side pressure chamber, causing the hydraulic oil to flow through the corresponding channel to the corresponding second port. Finally, when flowing through the supply gap, the oil is split, with part flowing to the corresponding first port and through the corresponding connecting hole to be discharged through the second return oil passage communicating with the corresponding connecting hole via the pilot valve chamber, and part flowing to the first return oil passage for discharge. Attached Figure Description

[0023] Figure 1A schematic diagram of the structure of the control valve assembly described in this application, which reduces return oil resistance, before it moves is shown.

[0024] Figure 2 It shows Figure 1 Enlarged view of a local structure.

[0025] Figure 3 A schematic diagram of the structure of the control valve assembly described in this application after it has been moved is shown.

[0026] Figure 4 It shows Figure 3 Enlarged view of a local structure.

[0027] Figure 5 The schematic diagram of the control valve assembly described in this application, which reduces return oil resistance, is shown before it moves.

[0028] Figure 6 The schematic diagram of the control valve assembly described in this application after it has been moved is shown. Detailed Implementation

[0029] The following description is intended to disclose this application and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of this application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of this application.

[0030] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 application and simplifying the description, and 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. Therefore, the above terms should not be construed as limitations on this application.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] refer to Figures 1 to 6A preferred embodiment of the control valve assembly for reducing return oil resistance according to this application will be described in detail below. The control valve assembly for reducing return oil resistance includes a main valve component 10, which includes a main valve body 11 and a main valve core 12. The main valve body 11 has a main valve chamber 1101 and two side pressure chambers 1102 located at both ends of the main valve chamber 1101 and communicating with the main valve chamber 1101. The main valve core 12 is located within the main valve chamber 1101, with its two ends extending from the main valve chamber 1101 into the side pressure chambers 1102. The main valve core 12 is configured to slide within the main valve chamber 1101 such that one end moves in a direction corresponding to the side pressure chamber 1102 and the other end moves in a direction extending into the other side pressure chamber 1102, thereby controlling the flow of fluid through the main valve component 10.

[0033] It is worth mentioning that the main valve body 11 also has two channels 1103, each of which is connected to a side pressure chamber 1102. When hydraulic oil is introduced into either of the two channels 1103, the hydraulic oil is introduced into the side pressure chamber 1102 connected to the corresponding channel 1103 to push the main valve core 12 to slide in the main valve chamber 1101 in the direction of being pulled out of the corresponding side pressure chamber 1102 and extended into the other side pressure chamber 1102, so as to reverse the flow of fluid through the main valve body 11; at the same time, the hydraulic oil in the other side pressure chamber 1102 is squeezed and discharged through the channel 1103 connected to it.

[0034] Preferably, the main valve component 10 includes two first elastic elements 13, each of which is located within a side pressure cavity 1102 and its two ends correspond to the inner wall of the side pressure cavity 1102 and the end of the main valve core 12 located at the end of the side pressure cavity 1102. The first elastic element 13 undergoes elastic deformation when the main valve core 12 is moved under force, and the first elastic element 13 can be reset when the external force applied to the main valve core 12 is removed.

[0035] Preferably, the first elastic element 13 is implemented as a spring.

[0036] Furthermore, the main valve body 11 also has an inlet 1104, at least one outlet 1105, and two working ports 1106. The main valve core 12 moves within the main valve chamber 1101 such that one of the two working ports 1106 communicates with the inlet 1104 through the main valve chamber 1101, while the other communicates with the outlet 1105 through the main valve chamber 1101. When the pressure at both ends of the main valve core 12 is equal, the main valve core 12 isolates the two working ports 1106 from the inlet 1104 and the outlet 1105.

[0037] The control valve assembly for reducing return oil resistance further includes a control valve component 20. The control valve component 20 includes a control valve body 21, a control valve core 22, and two second elastic elements 23. The control valve body 21 has two spaced-apart hydraulic chambers 2101. The control valve core 22 is installed within the control valve body 21 with its two ends respectively positioned within the two hydraulic chambers 2101. Each second elastic element 23 is disposed within one hydraulic chamber 2101, with its two ends respectively connected to the inner wall of the corresponding hydraulic chamber 2101. The control valve core 22 is configured to slide within the control valve body 21, allowing one end to move out of the corresponding hydraulic chamber 2101 and the other end to move into the corresponding hydraulic chamber 2101.

[0038] Preferably, the second elastic element 23 is implemented as a spring.

[0039] The control valve core 22 has two radial holes 2201 spaced apart axially, and the portion of the control valve core 22 located between the two radial holes 2201 forms a flow supply gap 201 with the inner wall of the control valve body 21. The control valve body 21 also has two first connecting holes 2102, two second connecting holes 2103, and a first return oil passage 2104. When the pressure at both ends of the control valve core 22 is consistent, each first connecting hole 2102 communicates with a second connecting hole 2103 through a radial hole 2201, and the control valve core 22 isolates the first connecting hole 2102, the second connecting hole 2103, and the first return oil passage 2104. The end of each passage 1103 away from the corresponding side pressure chamber 1102 communicates with a second connecting hole 2103. Both ends of the control valve core 22 are formed with an axial hole 2202 that communicates with the radial hole 2201 on the same side, and the end of each axial hole 2202 away from the corresponding radial hole 2201 is connected to a hydraulic chamber 2101.

[0040] When hydraulic oil is introduced into either of the two first ports 2102, the hydraulic oil flows through the radial hole 2201 communicating with the corresponding first port 2102 and is diverted to the second port 2103 communicating with the corresponding radial hole 2201, and finally flows into the corresponding side pressure chamber 1102 through the channel 1103 communicating with the corresponding second port 2103, thereby pushing the main valve core 12 in the main valve chamber 1101 to move in the direction of being pulled out of the corresponding side pressure chamber 1102 and extended into the other side pressure chamber 1102, so as to reverse the flow of fluid through the main valve body 11; part of the hydraulic oil flows into the corresponding oil pressure chamber 2101 through the axial hole 2202 communicating with the corresponding radial hole 2201, corresponding to the The hydraulic oil in the hydraulic chamber 2101 pushes the control valve core 22 to slide in the control valve body 21 in the direction of being pulled out of the hydraulic chamber 2101, so that another first connection hole 2102 is connected to another second connection hole 2103 through the supply gap 201, and the other second connection hole 2103 is connected to the first return oil passage 2104 through the supply gap 201. At the same time, the main valve core 12 extends into another side pressure chamber 1102 and squeezes the hydraulic oil in the corresponding side pressure chamber 1102, so that the hydraulic oil flows through the corresponding channel 1103 to the corresponding second connection hole 2103, and finally, when flowing through the supply gap 201, it is split, with part flowing to the corresponding first connection hole 2102 and part flowing to the first return oil passage 2104.

[0041] The control valve assembly that can reduce return oil resistance also includes a pilot valve 30, which is installed on the control valve body 21. The pilot valve 30 can be controlled to introduce hydraulic oil into either of the two first ports 2102, thereby providing power for the subsequent operation of the control valve 20 and the main valve 10.

[0042] The pilot valve 30 includes a pilot valve body 31 and a pilot valve core 32. The pilot valve body 31 has a pilot valve cavity 3101, two phase connection holes 3102, an oil inlet passage 3103 and a second oil return passage 3104. The two phase connection holes 3102 are respectively connected to the two first connection holes 2102. The pilot valve core 32 is installed in the pilot valve cavity 3101. The pilot valve core 32 is configured to be movable so that one of the two connecting holes 3102 communicates with the oil inlet passage 3103 through the pilot valve cavity 3101, and the other communicates with the second return passage 3104 through the pilot valve cavity 3101. This allows hydraulic oil to be introduced into the pilot valve cavity 3101 through the oil inlet passage 3103 and then flow to one of the connecting holes 3102, thereby supplying hydraulic oil to the first connecting hole 2102 that communicates with the corresponding connecting hole 3102. At the same time, the hydraulic oil discharged from the other first connecting hole 2102 flows through the corresponding connecting hole 3102 and is finally discharged through the second return passage 3104 that communicates with the corresponding connecting hole 3102 through the pilot valve cavity 3101. When the forces at both ends of the pilot valve core 32 are equal, the pilot valve core 32 isolates the two connecting holes 3102 from the oil inlet passage 3103 and the second return passage 3104.

[0043] In this way, by utilizing the coordinated action of the control valve 20, the main valve 10, and the pilot valve 30, the hydraulic oil discharged from the main valve 10 is diverted and returned. Compared to a direct connection between the main valve 10 and the pilot valve 30, this method utilizes only the second return oil passage 3104 of the pilot valve 30 for oil return. This reduces the return oil resistance, thereby reducing the resistance when the main valve core 12 moves and increasing the switching speed, effectively improving the response speed of the main valve 10. Furthermore, the reduced return oil resistance decreases the energy loss required for hydraulic oil delivery and effectively prevents the hydraulic oil from overheating due to excessive resistance, thus avoiding accelerated aging and compromised sealing of the control valve assembly that reduces return oil resistance. It also prevents significant noise and mechanical vibration caused by turbulence and pressure fluctuations.

[0044] Preferably, the first return oil passage 2104 is connected to the second return oil passage 3104 so that the hydraulic oil flowing into the first return oil passage 2104 can mix with the hydraulic oil flowing through the second return oil passage 3104 for centralized discharge.

[0045] The pilot valve 30 further includes a control mechanism 33, which is located at the end of the pilot valve core 32 and is installed on the pilot valve body 31. The control mechanism 33 is configured to drive the pilot valve core 32 to move within the pilot valve cavity 3101 to control the flow direction of hydraulic oil.

[0046] The control mechanism 33 includes two control components 331. Each control component 331 includes an electromagnetic coil 3311 and a pusher 3312. The electromagnetic coils 3311 of the two control components 331 are mounted opposite to each other on the valve body 31. The two pushers 3312 are located at both ends of the valve core 32, and the end of each pusher 3312 away from the valve core 32 is made of a soft magnetic material. The pusher 3312 is movably disposed within the electromagnetic coil 3311. When either of the two electromagnetic coils 3311 is energized, the corresponding pusher 3312 is magnetized and moves toward the other electromagnetic coil 3311 to push the valve core 32 to move within the valve cavity 3101, thereby achieving automatic reversing.

[0047] The control mechanism 33 further includes two third elastic elements 332. The two ends of each third elastic element 332 correspond to one end of the pilot valve core 32 and the pilot valve body 31, respectively. The third elastic element 332 can undergo elastic deformation when the pilot valve core 32 is driven to move in the pilot valve cavity 3101. The third elastic element 332 can reset the pilot valve core 32 when it is not subjected to external force.

[0048] Preferably, the third elastic element 332 is implemented as a spring.

[0049] Furthermore, the main valve body 11 has a first oil inlet 1107, and the control valve body 21 has a second oil inlet 2105. One end of the first oil inlet 1107 communicates with the second oil inlet 2105, and the end of the second oil inlet 2105 away from the first oil inlet 1107 communicates with the oil inlet passage 3103. In this way, hydraulic oil flows through the first oil inlet 1107, through the second oil inlet 2105, and into the oil inlet passage 3103 to supply hydraulic oil to the pilot valve 30.

[0050] The main valve body 11 also has an oil outlet 1108. One end of the oil outlet 1108 is connected to the oil tank, and the other end of the oil outlet 1108 is connected to the second return oil passage 3104, so that the hydraulic oil collected in the second return oil passage 3104 is introduced into the oil tank through the oil outlet 1108.

[0051] In this way, the main valve body 11 can be directly connected to the oil tank, simplifying the pipeline and increasing the ease of assembly.

[0052] A method for operating a control valve assembly that can reduce return oil resistance is proposed. The method includes the following steps:

[0053] The pilot valve core 32 is driven to move within the pilot valve cavity 3101, such that one of the two connecting holes 3102 is connected to the oil inlet passage 3103 through the pilot valve cavity 3101, and the other is connected to the second oil return passage 3104 through the pilot valve cavity 3101. Hydraulic oil is introduced into the pilot valve cavity 3101 through the oil inlet passage 3103 and then flows to one of the connecting holes 3102, thereby supplying hydraulic oil to the first connecting hole 2102 that is connected to the corresponding connecting hole 3102.

[0054] Hydraulic oil flows through the radial hole 2201 that communicates with the corresponding first connection hole 2102 and is split to flow partly to the second connection hole 2103 that communicates with the corresponding radial hole 2201 and partly through the axial hole 2202 that communicates with the corresponding radial hole 2201 into the corresponding oil pressure chamber 2101. The hydraulic oil in the corresponding oil pressure chamber 2101 pushes the control valve core 22 to slide in the control valve body 21 in the direction of being pulled out of the corresponding oil pressure chamber 2101, so that the other first connection hole 2102 communicates with the other second connection hole 2103 through the supply gap 201, and the other second connection hole 2103 communicates with the first return oil passage 2104 through the supply gap 201.

[0055] The second port 2103, through which hydraulic oil is introduced, introduces hydraulic oil into the corresponding side pressure chamber 1102 via the channel 1103 that communicates with the corresponding second port 2103. The hydraulic oil pushes the main valve core 12 within the main valve chamber 1101 to move in the direction of being withdrawn from the corresponding side pressure chamber 1102, thereby reversing the flow of fluid through the main valve body 11. Simultaneously, the main valve core 12 extends into another side pressure chamber 1102 and squeezes the hydraulic oil within the corresponding side pressure chamber 1102, causing the hydraulic oil to flow through the corresponding channel 1103 to the corresponding second port 2103. Finally, when flowing through the supply gap 201, the flow is split, with part flowing to the corresponding first port 2102 and through the corresponding connecting hole 3102 to be discharged through the second return oil passage 3104 that communicates with the corresponding connecting hole 3102 via the pilot valve chamber 3101, and part flowing to the first return oil passage 2104 for discharge.

[0056] The operating method of the control valve assembly that can reduce return oil resistance also includes the following steps:

[0057] The control mechanism 33 drives the pilot valve core 32 to move within the pilot valve cavity 3101.

[0058] Preferably, the operating method of the control valve assembly that can reduce return oil resistance further includes the following steps: the hydraulic oil flowing into the first return oil passage 2104 can be mixed with the hydraulic oil flowing through the second return oil passage 3104 for centralized discharge.

[0059] Preferably, the operating method of the control valve assembly that can reduce return oil resistance further includes the following steps: the hydraulic oil collected in the second return oil passage 3104 is introduced into the oil tank through the oil outlet 1108.

[0060] The operating method of the control valve assembly that can reduce return oil resistance also includes the following steps:

[0061] The hydraulic oil in the oil tank flows through the first oil inlet 1107 and the second oil inlet 2105 before being introduced into the oil inlet channel 3103 to supply hydraulic oil to the pilot valve 30.

[0062] Those skilled in the art should understand that the embodiments of this application described above and shown in the accompanying drawings are merely examples and do not limit the scope of this application. The advantages of this application have been fully and effectively implemented. The functional and structural principles of this application have been demonstrated and explained in the embodiments, and any variations or modifications can be made to the implementation of this application without departing from the stated principles.

Claims

1. A control valve, characterized in that, The control valve includes: The control valve body has two spaced-apart hydraulic chambers, and also has two first connecting holes, two second connecting holes, and a first return oil passage; A control valve core is installed in the control valve body with its two ends respectively placed in the two hydraulic chambers. The control valve core has two radial holes spaced apart along its axial direction, and the portion of the control valve core between the two radial holes forms a flow supply gap with the inner wall of the control valve body. Both ends of the control valve core form axial holes communicating with the radial holes on the same side, and the end of each axial hole away from the corresponding radial hole communicates with a hydraulic chamber. The control valve core is configured to slide within the control valve body so that one end moves in the direction of withdrawal from the corresponding hydraulic chamber and the other end moves in the direction of insertion into the corresponding hydraulic chamber. When the pressure on both ends of the control valve core is the same, each of the first connecting holes passes through a... The radial hole communicates with a second connection hole, and the control valve core isolates the first connection hole, the second connection hole, and the first return oil passage. When hydraulic oil is introduced into either of the two first connection holes, the hydraulic oil flows through the radial hole communicating with the corresponding first connection hole and is diverted to the second connection hole communicating with the corresponding radial hole. A portion of the hydraulic oil flows into the corresponding oil pressure chamber through the axial hole communicating with the corresponding radial hole. The hydraulic oil in the corresponding oil pressure chamber pushes the control valve core to slide in the control valve body in the direction of being pulled out of the corresponding oil pressure chamber, so that the other first connection hole communicates with the other second connection hole through the supply gap, and the other second connection hole communicates with the first return oil passage through the supply gap. Two second elastic elements are provided, each of which is disposed in a hydraulic chamber and its two ends are respectively connected to the inner wall of the corresponding hydraulic chamber, and the control valve core is placed at one end of the corresponding hydraulic chamber.

2. A control valve assembly that can reduce return oil resistance, characterized in that, The control valve assembly that can reduce return oil resistance includes: The control valve as described in claim 1; The main valve component includes a main valve body and a main valve core. The main valve body has a main valve cavity and two side pressure chambers located at both ends of the main valve cavity and communicating with the main valve cavity. The main valve core is located in the main valve cavity and its two ends extend from the main valve cavity into the side pressure chambers respectively. The main valve core is configured to slide in the main valve cavity such that one end moves in the direction of being pulled out of the corresponding side pressure chamber and the other end moves in the direction of being extended into the other side pressure chamber. The main valve body also has two channels, each of which communicates with one of the side pressure chambers. The end of each channel away from the corresponding side pressure chamber communicates with a second connection hole. A pilot valve includes a pilot valve body and a pilot valve core. The pilot valve body has a pilot valve cavity, two connection holes, an oil inlet passage, and a second oil return passage. The two connection holes are respectively connected to two first connection holes. The pilot valve core is installed in the pilot valve cavity. The pilot valve core is configured to move so that one of the two connection holes is connected to the oil inlet passage through the pilot valve cavity, and the other is connected to the second oil return passage through the pilot valve cavity. When the two ends of the pilot valve core are subjected to the same force, the pilot valve core isolates the two connection holes from the oil inlet passage and the second oil return passage.

3. The control valve assembly for reducing return oil resistance according to claim 2, characterized in that, The main valve component includes two first elastic elements. Each first elastic element is located in a side pressure chamber and its two ends are respectively connected to the inner wall of the corresponding side pressure chamber. The main valve core is located at one end of the corresponding side pressure chamber. The first elastic element undergoes elastic deformation when the main valve core is moved under force. The first elastic element can be reset when the external force applied to the main valve core is removed.

4. The control valve assembly for reducing return oil resistance according to claim 2 or 3, characterized in that, The main valve body also has an inlet, at least one outlet and two working ports. The main valve core moves within the main valve cavity so that one of the two working ports communicates with the inlet through the main valve cavity and the other communicates with the outlet through the main valve cavity. When the pressure at both ends of the main valve core is the same, the main valve core isolates the two working ports from the inlet and the outlet.

5. The control valve assembly for reducing return oil resistance according to claim 2, characterized in that, The pilot valve also includes a control mechanism located at the end of the pilot valve core and mounted on the pilot valve body. The control mechanism is configured to drive the pilot valve core to move within the pilot valve cavity.

6. The control valve assembly for reducing return oil resistance according to claim 5, characterized in that, The control mechanism includes two control components, each including an electromagnetic coil and a pushing member. The electromagnetic coils of the two control components are mounted opposite to each other on the valve body. The two pushing members are located at both ends of the valve core, and the end of each pushing member away from the valve core is made of a soft magnetic material. The pushing member is movably disposed within the electromagnetic coil. When either of the two electromagnetic coils is energized, the corresponding pushing member is magnetized and moves toward the other electromagnetic coil to push the valve core to move within the valve cavity.

7. The control valve assembly for reducing return oil resistance according to claim 6, characterized in that, The control mechanism further includes two third elastic elements, each of which has two ends corresponding to one end of the pilot valve core and the pilot valve body, respectively. The third elastic element can undergo elastic deformation when the pilot valve core is driven to move into the pilot valve cavity, and can reset the pilot valve core when it is not subjected to external force.

8. The control valve assembly for reducing return oil resistance according to claim 2, characterized in that, The first return oil passage is connected to the second return oil passage, and the main valve body also has an oil outlet hole. One end of the oil outlet hole is connected to the oil tank, and the other end of the oil outlet hole is connected to the second return oil passage.

9. The control valve assembly for reducing return oil resistance according to claim 2, characterized in that, The main valve body has a first oil inlet hole, and the control valve body has a second oil inlet hole. One end of the first oil inlet hole is connected to the second oil inlet hole, and the end of the second oil inlet hole away from the first oil inlet hole is connected to the oil inlet passage.

10. The operating method of the control valve assembly for reducing return oil resistance according to any one of claims 2 to 9, characterized in that, The operating method of the control valve assembly that can reduce return oil resistance includes the following steps: The pilot valve core is driven to move within the pilot valve cavity, such that one of the two connecting holes is connected to the oil inlet passage through the pilot valve cavity, and the other is connected to the second return passage through the pilot valve cavity. Hydraulic oil is introduced into the pilot valve cavity through the oil inlet passage and then flows to one of the connecting holes, thereby supplying hydraulic oil to the first connecting hole connected to the corresponding connecting hole. Hydraulic oil flows through the radial hole communicating with the corresponding first connection hole and is split to flow partly to the second connection hole communicating with the corresponding radial hole and partly through the axial hole communicating with the corresponding radial hole into the corresponding oil pressure chamber. The hydraulic oil in the corresponding oil pressure chamber pushes the control valve core to slide in the control valve body in the direction of being pulled out of the corresponding oil pressure chamber, so that the other first connection hole communicates with the other second connection hole through the supply gap, and the other second connection hole communicates with the first return oil passage through the supply gap. The second port, through which hydraulic oil is introduced, introduces hydraulic oil into the corresponding side pressure chamber via the channel communicating with the corresponding second port. The hydraulic oil pushes the main valve core within the main valve chamber to move in the direction of withdrawal from the corresponding side pressure chamber, thereby reversing the flow of fluid through the main valve body. Simultaneously, the main valve core extends into another side pressure chamber and squeezes the hydraulic oil within the corresponding side pressure chamber, causing the hydraulic oil to flow through the corresponding channel to the corresponding second port. Finally, when flowing through the supply gap, the oil is split, with part flowing to the corresponding first port and through the corresponding connecting hole to be discharged through the second return oil passage communicating with the corresponding connecting hole via the pilot valve chamber, and part flowing to the first return oil passage for discharge.

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