Electrically controlled valve for closed hydraulic pump

Abstract

The application belongs to the technical field of electric control valves, and particularly relates to an electric control valve for a closed hydraulic pump. The electric control valve comprises a shell, a valve body fixedly connected in the shell, electromagnetic driving members mounted on the two sides of the shell, a first valve core slidingly connected in the valve body, second valve cores threadedly connected on the two sides of the first valve core, a third valve core threadedly connected on the side of the second valve core away from the first valve core, a driving end of the electromagnetic driving member for pushing the third valve core to move, a first flow guide ring rotationally connected with the second valve core, a support rod fixedly connected in the valve body, a feedback rod fixedly connected with the support rod, and a valve control system and a flow system arranged in the valve body. The first flow guide ring is used for guiding and dispersing the oil, so as to reduce the impact force of the oil on the edge of the second valve core, thereby reducing the probability of wear of the second valve core and ensuring the sealing between the second valve core and the valve body.

Description

Technical Field

[0001] This invention relates to the field of electronically controlled valve technology, and in particular to an electronically controlled valve for a closed-loop hydraulic pump. Background Technology

[0002] A closed-loop hydraulic pump achieves fluid intake and discharge by periodically changing the sealed volume through the movement of a plunger. Simultaneously, the high-pressure outlet of the hydraulic pump is directly connected to the input end of a hydraulic motor, and the motor's output end is connected to the pump's suction port, forming a closed oil circuit. To adjust the pump's displacement and flow rate, as well as control the flow direction of the hydraulic fluid, an electrically controlled valve is installed. Investigations have revealed that the most commonly used electrically controlled valves are electro-proportional valves (such as the A4VG series), which primarily use a proportional solenoid to drive the valve core axially, directly controlling the pump's displacement or direction.

[0003] Existing electro-proportional valves (represented by the A4VG series) have structural reliability defects: the valve core inside is in reciprocating motion. During operation, the high-speed flowing oil in different oil passages (especially the high-pressure drain port) will generate fluid forces (such as dynamic pressure and shear force) on the valve core surface (especially the area corresponding to the drain port). As the usage time increases, the position of the valve core corresponding to the drain port will wear due to the long-term flushing and erosion of the oil, resulting in an increase in the fit clearance between the valve core and the valve body hole, a decrease in sealing performance, and uncontrollable flow of oil in the electro-proportional valve. As a result, the electro-proportional valve cannot accurately control the displacement or direction of the hydraulic pump. Summary of the Invention

[0004] In order to overcome the shortcomings described in the background art, the present invention provides an electrically controlled valve for a closed hydraulic pump.

[0005] The technical solution of the present invention is as follows: an electrically controlled valve for a closed-loop hydraulic pump, comprising a housing, a valve body fixedly connected inside the housing, electromagnetic drive components mounted on both sides of the housing, a first valve core slidably connected inside the valve body, a second valve core threadedly connected to both sides of the first valve core, a third valve core threadedly connected to the side of the second valve core away from the first valve core, the drive end of the electromagnetic drive component being used to push the third valve core to move, a first guide ring being rotatably connected to the second valve core, a support rod fixedly connected inside the valve body, a feedback rod fixedly connected to the support rod, a valve control system and a flow system being provided inside the valve body, the valve control system being used to control the swing of the feedback rod, and the flow system being used to provide space for changes in the oil circuit inside the valve body.

[0006] To further explain, the first guide ring is frustum-shaped.

[0007] Further explanation: The circulation system comprises a first oil outlet channel, a second oil outlet channel, a first oil inlet channel, a second oil inlet channel, a first oil return channel, a second oil return channel, a first oil passage channel, a second oil passage channel, a working chamber, a rotary chamber, and an oil discharge channel. The first oil outlet channel, the first oil inlet channel, the first oil return channel, and the first oil passage channel are all located on one side of the valve body, while the second oil outlet channel, the second oil inlet channel, the second oil return channel, and the second oil passage channel are all located on the other side of the valve body. There are two working chambers, both located within the valve body. The first valve core is located in both chambers. The working chamber slides within the valve body, with the two second valve cores and the two third valve cores sliding within adjacent working chambers respectively. The first oil outlet passage, the second oil outlet passage, the first oil inlet passage, the second oil inlet passage, the first oil return passage, the second oil return passage, the first oil passage through the passage, and the second oil passage through the passage are all connected to adjacent working chambers. The rotary chamber is located within the valve body, and the first oil return passage, the second oil return passage, the first oil passage through the passage, and the second oil passage through the passage are all connected to the rotary chamber. The oil discharge passage is located on the support rod and is connected to the rotary chamber.

[0008] To further explain, the first guide ring is fixed with circumferentially distributed guide protrusions.

[0009] To further explain, a second flow guide ring is rotatably connected to the third valve core, and the second flow guide ring is in contact with the adjacent second valve core.

[0010] To further explain, the second guide ring is fixed with circumferentially distributed guide protrusions.

[0011] To further explain, the outer side of the projection of the second guide ring onto the plane passing through its axis is arc-shaped.

[0012] To further clarify, the number of both the first oil passage and the second oil passage is at least two.

[0013] Further explanation includes: a collection shell, installed inside the rotary cavity, the collection shell having a plurality of connecting ports, the number of which is consistent with the sum of the numbers of all first oil passages and all second oil passages; a fixing post fixedly connected to the collection shell at each connecting port; a discharge pipe fixedly connected to the fixing post; the first oil passages and the second oil passages respectively communicating with the adjacent discharge pipes; and a fixing frame, installed on the upper side of the fixing post, the fixing frame being fixedly connected to an intercepting net, the intercepting net being fixedly connected to the collection shell.

[0014] To further explain, the interception net has a flow guiding section and a dispersion section, wherein the flow guiding section is located inside the fixed frame and is in the shape of an inverted frustum, and the dispersion section is located outside the flow guiding section.

[0015] The beneficial effects of the present invention are as follows: The present invention guides and disperses the oil through the first guide ring, reduces the impact force of the oil on the edge of the second valve core, thereby reducing the probability of wear of the second valve core and ensuring the seal between the second valve core and the valve body.

[0016] The present invention increases the contact area of ​​the first guide ring with the oil by setting a guide protrusion on the first guide ring, which makes it easier for the oil to drive the first guide ring to rotate.

[0017] The present invention guides and disperses the oil through the second guide ring and guide protrusion, reducing the impact of the oil on the edges of the third valve core and the second valve core, thereby ensuring the seal between the third valve core, the second valve core and the valve body.

[0018] This invention filters impurities in flowing oil using an interception net, improving the cleanliness of the oil and thus reducing wear on the device caused by impurities, ensuring the device's sealing performance during use. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural cross-sectional view of the outer casing of the present invention;

[0021] Figure 3 This is a three-dimensional sectional view of the valve body of the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the components inside the valve body of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the first and second oil outlet channels of the present invention;

[0024] Figure 6 This is a three-dimensional structural diagram of the support rod and feedback rod of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the first valve core, the second valve core, and the third valve core of the present invention;

[0026] Figure 8 This is an exploded three-dimensional view of the components on the first valve core of the present invention.

[0027] Figure 9 This is a three-dimensional structural diagram of the second robotic arm and elastic element of the present invention;

[0028] Figure 10 This is a three-dimensional structural diagram of the first oil passage and the working chamber of the present invention;

[0029] Figure 11This is a three-dimensional structural diagram of the collecting shell and fixing column of the present invention;

[0030] Figure 12 A three-dimensional structural cross-sectional view of the housing and fixing column of this invention;

[0031] Figure 13 This is a three-dimensional structural diagram of the first and second oil inlet channels of the present invention.

[0032] The markings in the attached diagram are as follows: 1-Outer shell, 2-Valve body, 3-Electromagnetic drive component, 4-First valve core, 5-Second valve core, 6-Third valve core, 7-First guide ring, 8-Support rod, 9-Feedback rod, 10-First robotic arm, 11-Second robotic arm, 12-Elastic component, 13-Connecting plate, 14-First pin, 15-Second pin, 100-First oil outlet passage, 200-Second oil outlet passage, 300-First oil inlet passage, 400-Second oil inlet passage, 500-First return oil passage, 600-Second return oil passage, 700-First oil passage, 800-Second oil passage, 900-Working chamber, 1000-Rotation chamber, 1100-Oil discharge passage, 21-Guide protrusion, 31-Second guide ring, 32-Guide strip, 41-Collection shell, 42-Fixing column, 43-Discharge pipe, 44-Fixing frame, 45-Interception net. Detailed Implementation

[0033] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art. Example 1

[0034] This embodiment discloses an electrically controlled valve for a closed-loop hydraulic pump, which has the function of guiding the hydraulic oil at the second valve core 5, thereby reducing the impact force of the hydraulic oil on the second valve core 5.

[0035] Please refer to the following: Figures 1-9The system includes an outer casing 1, a valve body 2 fixedly connected inside the casing 1, and electromagnetic drive components 3 installed on both sides of the casing 1. Each electromagnetic drive component 3 mainly consists of an electromagnetic coil and a connecting rod. By energizing the electromagnetic coil, a magnetic field is generated, attracting the connecting rod to move (in this application, an existing structure is used without special design, so its internal principle will not be described in detail). A first valve core 4 is slidably connected inside the valve body 2. Second valve cores 5 are threadedly connected to both sides of the first valve core 4. A third valve core 6 is threadedly connected to the side of the second valve core 5 furthest from the first valve core 4. The driving end of the electromagnetic drive component 3 is used to push the adjacent third valve core 6 to move. The movement of the connecting rod drives the third valve core 6 to move, thereby moving the first valve core 4 and all the second valve cores 5. The first valve core 4, the two second valve cores 5, and the two third valve cores 6 together form the existing complete valve core. By changing the complete valve core... The position of the valve core changes the connection state of the oil circuit inside the valve body, thereby controlling the flow direction and pressure of the oil. The second valve core 5 is rotatably connected to the first guide ring 7. The first guide ring 7 is frustoconical and is used to guide the passing oil, reduce the impact on the edge of the second valve core 5, and ensure the normal use of the second valve core 5. The outer diameter of the side of the first guide ring 7 away from the first valve core 4 is the same as the diameter of the adjacent second valve core 5. A support rod 8 is fixedly connected inside the valve body 2. The support rod 8 is fixedly connected to a feedback rod 9. The feedback rod 9 is connected to the existing variable piston (the variable piston is an existing structure and is not shown in the figure). The valve body 2 is equipped with a control valve system and a flow system. The control valve system is used to control the swing of the feedback rod 9. The flow system is used to provide space for the oil circuit changes inside the valve body 2. The feedback rod 9 is connected to the external hydraulic system. By swinging the feedback rod 9, the flow rate of the oil circuit in the hydraulic system is controlled.

[0036] Please refer to the following: Figures 1-4 and Figures 6-9 The valve control system includes a first robotic arm 10, a second robotic arm 11, a connecting plate 13, a first pin 14, and a second pin 15. Both the first robotic arm 10 and the second robotic arm 11 are rotatably connected to the support rod 8. An elastic element 12, which is a tension spring, is fixedly connected between the first robotic arm 10 and the second robotic arm 11 to reset the first robotic arm 10 and the second robotic arm 11. The connecting plate 13 is fixedly connected to the feedback rod 9 and passes through the first valve core 4. A square through hole is provided in the middle of the first valve core 4, which provides space for the movement of the connecting plate 13. The first pin 14 is fixedly connected to the upper side of the connecting plate 13 and is used to push the first robotic arm 10 and the second robotic arm 11. The second pin 15 is fixedly connected to the upper side of the first valve core 4 and is used to push the first robotic arm 10 and the second robotic arm 11.

[0037] Please refer to the following: Figures 1-4 , Figure 10 , Figure 11 and Figure 13The circulation system consists of a first oil outlet 100, a second oil outlet 200, a first oil inlet 300, a second oil inlet 400, a first oil return 500, a second oil return 600, a first oil passage 700, a second oil passage 800, a working chamber 900, a rotating chamber 1000, and an oil discharge 1100. The first oil outlet 100, the first oil inlet 300, the first oil return 500, and the first oil passage 700 are all located on the left side of the valve body 2. The second oil outlet 200... The second oil inlet passage 400, the second oil return passage 600, and the second oil passage 800 are all located on the right side of the valve body 2. The first oil outlet passage 100 and the second oil outlet passage 200 are respectively connected to both sides of the existing variable piston. The first oil inlet passage 300 and the second oil inlet passage 400 are both connected to the external oil supply system. The first oil outlet passage 100 is located between the first oil inlet passage 300 and the first oil return passage 500, and the second oil outlet passage 200 is located between the second oil inlet passage 400 and the second oil return passage 600 (e.g., ...). Figure 13 The first oil passage 700 and the second oil passage 800 are located on the opposite sides of the two third valve cores 6. The first oil inlet passage 300 is located between the first oil outlet passage 100 and the first oil passage 700. The second oil inlet passage 400 is located between the second oil outlet passage 200 and the second oil passage 800 (e.g., Figure 13 The valve body 2 has two working chambers 900, both located within the valve body 2. The first valve core 4 slides within both working chambers 900, while the two second valve cores 5 and two third valve cores 6 slide within adjacent working chambers 900 (e.g., ...). Figure 13 The first oil outlet 100, the second oil outlet 200, the first oil inlet 300, the second oil inlet 400, the first oil return 500, the second oil return 600, the first oil passage 700, and the second oil passage 800 are respectively connected to the adjacent working chamber 900. The rotary chamber 1000 is set inside the valve body 2. The first oil return 500, the second oil return 600, the first oil passage 700, and the second oil passage 800 are all connected to the rotary chamber 1000. The oil discharge 1100 is set on the support rod 8 and is connected to the rotary chamber 1000. The upper side of the oil discharge 1100 is connected to the external oil tank. All the above oil passages and chambers are filled with oil.

[0038] Initially, the two third valve cores 6 are located between the first oil inlet channel 300 and the first oil passage 700, and between the second oil inlet channel 400 and the second oil passage 800, respectively; the two second valve cores 5 block the first oil outlet channel 100 and the second oil outlet channel 200, respectively, and are located between the first oil inlet channel 300 and the first return oil channel 500, and between the second oil inlet channel 400 and the second return oil channel 600, respectively; the first valve core 4 is located in the middle of the valve body 2.

[0039] The working process of the electrically controlled valve for the closed-loop hydraulic pump in this embodiment is as follows:

[0040] In using this electrically controlled valve, taking the control of the entire valve core moving to the left as an example, the right-side electromagnetic drive 3 is activated. The drive end of the right-side electromagnetic drive 3 pushes the right-side third valve core 6 to move to the left, simultaneously driving the right-side second valve core 5, the first valve core 4, the left-side second valve core 5, and the left-side third valve core 6 to move to the left. During this process, the first valve core 4 drives the second pin 15 to move to the left, and the second pin 15 pushes the first robotic arm 10. The first robotic arm 10 rotates counterclockwise around the support rod 8 (towards...). Figure 9 (Taking a top view as an example), at this time, the second robotic arm 11 cannot move under the obstruction of the first pin 14, and the elastic element 12 is stretched.

[0041] As the valve core moves to the left, the second valve core 5 on the right side gradually releases the blockage of the second oil outlet 200. The second oil inlet 400 connects to the second oil outlet 200 through the right working chamber 900. At this time, the oil supply system is turned on, and the oil enters the second oil outlet 200 through the second oil inlet 400 and the right working chamber 900 under the action of the oil supply system (at this time, the second oil outlet 200 cannot connect to the second return oil channel 600 due to the blocking effect of the second valve core 5 on the right side). The oil pushes the variable piston to move to the left, and the variable piston pushes the oil on its left side into the first oil outlet 100. The variable piston drives the feedback rod 9, causing the feedback rod 9 to rotate clockwise around the support rod 8, thereby regulating the oil flow in the hydraulic system. After the oil flow in the hydraulic system reaches the preset value (the flow is in a natural state), the drive end of the right electromagnetic drive 3 stops extending and remains extended (to maintain current stability).

[0042] As the entire valve core moves to the left, the second valve core 5 on the left moves to the left and gradually releases the blockage on the first oil outlet 100. At this time, the first oil outlet 100 is connected to the first return oil channel 500 through the left working chamber 900. The oil on the left side of the variable piston enters the first return oil channel 500 through the first oil outlet 100 and the left working chamber 900. Subsequently, this part of the oil continues to flow and enters the rotary chamber 1000. The oil enters the external oil tank through the rotary chamber 1000 (at this time, the first oil inlet 300 cannot be connected to the first oil outlet 100 through the left working chamber 900 due to the obstruction of the second valve core 5 on the left).

[0043] During the rotation of feedback rod 9, feedback rod 9 drives connecting plate 13 to move synchronously. Connecting plate 13 drives first pin 14 on it to move. First pin 14 pushes second robotic arm 11, causing second robotic arm 11 to rotate clockwise around support rod 8. Second robotic arm 11 drives first robotic arm 10 to rotate clockwise through elastic element 12. First robotic arm 10 drives first valve core 4 to move to the right through second pin 15. First valve core 4 pushes the drive end of right electromagnetic drive 3 to move. When first valve core 4 moves to the initial middle position, the entire valve core moves to the initial position, that is, the second oil inlet channel 400 and the second oil outlet channel 200 lose communication, and the first oil outlet channel 100 and the first oil return channel 500 lose communication. At this time, there is more oil on the right side of variable piston than on the left side of variable piston.

[0044] As the oil flows from the first oil outlet 100 into the left working chamber 900, the oil impacts the first guide ring 7. The first guide ring 7 guides the oil, reducing the impact force exerted by the oil. At the same time, under the guidance of the first guide ring 7, the impact force of the oil on the right edge of the second valve core 5 is reduced, thereby reducing the probability of wear on the second valve core 5 and ensuring the integrity of the second valve core 5, thus ensuring the seal between the second valve core 5 and the valve body 2.

[0045] When it is necessary to increase the flow rate of the hydraulic system, the current of the electromagnetic drive 3 is increased, and the drive end of the electromagnetic drive 3 continues to extend. Based on the above actions, the first robotic arm 10, the second robotic arm 11 and the feedback rod 9 continue to move until the flow rate of the hydraulic system is adjusted to the specified position. Then, the current flowing into the electromagnetic drive 3 on the right side is maintained and it is kept in the extended state.

[0046] When the electrically controlled valve needs to be reset, the current flowing into the electromagnetic drive 3 is first reduced to decrease its magnetic field. At this time, under the action of the elastic element 12, the first robotic arm 10 begins to rotate clockwise (at this time, the second robotic arm 11 cannot move due to the obstruction of the first pin 14). The first robotic arm 10 drives the entire valve core to move to the right, so that the first oil inlet passage 300 is connected to the first oil outlet passage 100 through the left working chamber 900, and the second oil outlet passage 200 is connected to the second return oil passage 600 through the right working chamber 900. Then the oil supply system starts to work and pumps oil into the first oil inlet passage 300. At this time, the oil flows through the first oil inlet passage. 300. The left working chamber 900 enters the first oil outlet 100 and enters the left side of the variable piston. Then the oil pushes the variable piston to move to the right. The variable piston pushes the oil on its right side through the second oil outlet 200 and the right working chamber 900 into the second return oil channel 600. Then the oil flows back to the oil tank through the second return oil channel 600 until the variable piston is reset. The variable piston drives the entire valve core to reset through the feedback rod 9, so that the entire valve core moves to the initial middle position, shuts off the oil supply system and resets the drive end of the electromagnetic drive 3. Then the use of this device ends. At this time, the flow rate of the oil circuit in the hydraulic system is in a natural state.

[0047] During the movement of the valve core and the driving ends of the two electromagnetic drive components 3, the space between the valve core and the driving ends of the two electromagnetic drive components 3 will change, thereby changing the pressure on the oil. This causes the driving ends of the valve core and the adjacent electromagnetic drive components 3 to squeeze or suck the oil between them, so that this part of the oil enters the rotary chamber 1000 through the first oil passage 700 (second oil passage 800) from the corresponding working chamber 900, or flows back from the rotary chamber 1000 through the first oil passage 700 (second oil passage 800) to the corresponding working chamber 900. Example 2

[0048] This embodiment discloses an electrically controlled valve for a closed-loop hydraulic pump, which, based on Embodiment 1, also has the function of rotating the first guide ring 7.

[0049] Please refer to the following: Figure 7 and Figure 8 The first guide ring 7 is fixed with circumferentially distributed guide protrusions 21. The guide protrusions 21 are used to increase the bearing area of ​​the first guide ring 7 for the oil, so that the oil can drive the first guide ring 7 to rotate. At the same time, the guide protrusions 21 are arranged at an angle, so that the rotation direction of the first guide ring 7 can be determined. Example 3

[0050] This embodiment discloses an electrically controlled valve for a closed-loop hydraulic pump. Based on Embodiment 1, it also has the function of guiding the hydraulic oil at the third valve core 6, thereby reducing the impact force of the hydraulic oil on the third valve core 6.

[0051] Please refer to the following: Figure 7 and Figure 8 A second guide ring 31 is rotatably connected to the third valve core 6. The second guide ring 31 is used to intercept the flowing oil and reduce the impact of the oil on the edges of the third valve core 6 and the second valve core 5. The second guide ring 31 is in contact with the adjacent second valve core 5. The diameters of the left and right sides of the second guide ring 31 are the same as the diameters of the adjacent third valve core 6 and the adjacent second valve core 5, respectively. A circumferentially distributed guide rib 32 is fixed to the second guide ring 31. The guide rib 32 is used to increase the contact area between the second guide ring 31 and the oil, so that the oil can drive the second guide ring 31 to rotate. The guide rib 32 is in an inclined state, which makes it easy to determine the rotation direction of the second guide ring 31. The outer side of the projection of the second guide ring 31 onto the plane passing through its axis is arc-shaped. This arc-shaped structure facilitates the guidance of the oil, making the oil tend to flow towards the center, thereby buffering the impact force of the oil.

[0052] In Embodiment 1, as the oil enters the working chamber 900 through the second inlet channel 400 under the action of the oil supply system, the oil impacts the second guide ring 31. The second guide ring 31 guides the passing oil, initially reducing the impact force of the oil. During this process, the oil impacts all the guide protrusions 32, and the guide protrusions 32 begin to drive the second guide ring 31 to rotate under the action of the oil. During the rotation of the second guide ring 31, the second guide ring 31 disperses the oil, further reducing the impact of the oil on the edges of the third valve core 6 and the second valve core 5, thereby ensuring the seal between the third valve core 6 and the second valve core 5 and the valve body 2.

[0053] During the use of existing electrically controlled valves, as the usage time increases, the internal hydraulic components will generate tiny particles (metal shavings) due to metal friction. These impurities will mix into the oil and circulate, thereby increasing the wear on other components. At the same time, the seals inside the valve body will break due to aging or mechanical friction. At this time, the residue of the broken seals will circulate in the oil, which can easily cause blockage of various oil passages in the valve. Example 4

[0054] This embodiment discloses an electrically controlled valve for a closed-loop hydraulic pump. Based on Embodiment 1, it mainly addresses the problem that in the existing system, there is only one first oil passage 700 and one second oil passage 800. This results in the electromagnetic drive 3 driving the oil from the working chamber 900 into the rotating chamber 1000. If the oil contains impurities, it will not flow smoothly, causing the drive end of the electromagnetic drive 3 to be obstructed.

[0055] Please refer to the following: Figure 4 , Figure 5 , Figure 10 and Figure 13 The number of first oil passages 700 and second oil passages 800 is at least two. By increasing the number of first oil passages 700 and second oil passages 800, the extruded oil is circumferentially dispersed into the rotary cavity 1000 or circumferentially returned to the working cavity 900. In this process, the fluidity of the oil is increased, and the oil in the working cavity 900 can easily enter the rotary cavity 1000, thereby making the drive end of the electromagnetic drive 3 move more smoothly. Example 5

[0056] This embodiment discloses an electrically controlled valve for a closed-loop hydraulic pump. Based on embodiment 4, it also has the function of filtering the hydraulic oil discharged from the first oil passage 700 and the second oil passage 800, thereby reducing impurities in the hydraulic oil.

[0057] Please refer to the following: Figure 3 , Figure 4 , Figure 11 and Figure 12It also includes a collection shell 41, which is detachably installed inside the rotary cavity 1000. In this embodiment, a cover plate is provided on the upper side of the outer shell 1 and the upper side of the valve body 2, and the two cover plates are respectively sealed to the outer shell 1 and the valve body 2. By removing the cover plates, it is easy to replace and clean the collection shell 41. The collection shell 41 is used to collect impurities. The collection shell 41 is provided with four connecting ports. The number of connecting ports is consistent with the sum of the number of all first oil passages 700 and all second oil passages 800. The connecting ports are used to allow impurities to enter the collection shell 41. Inside the collection shell 41, a fixed post 42 is fixedly connected to the connecting port. The upper part of the fixed post 42 is frustoconical to facilitate the guidance of impurities. The maximum diameter of the fixed post 42 is smaller than the diameter of the connecting port on the collection shell 41, so that impurities can enter the collection shell 41. The frustoconical part of the fixed post 42 is located above the connecting port of the collection shell 41. A discharge pipe 43 is fixedly connected to the fixed post 42. Oil is discharged into the rotary chamber 1000 through the upper side of the discharge pipe 43. The first oil passage 700 and the second oil passage 800 are respectively connected to the adjacent discharge pipe 43. The upper side of the discharge pipe 43 is higher than the connecting opening of the collection shell 41, reducing the probability of impurities entering the discharge pipe 43. A fixing frame 44 is installed on the upper side of the fixing column 42. The fixing frame 44 consists of a ring and several round rods. An intercepting net 45 is fixedly connected inside the ring of the fixing frame 44. The intercepting net 45 has a guiding part and a dispersing part. The guiding part is located inside the fixing frame 44 and is in the shape of an inverted frustum. The guiding part of the intercepting net 45 is used to guide the oil sprayed from the discharge pipe 43 to the surrounding area, causing impurities in the oil to move along the guiding part. The dispersing part of the intercepting net 45... The section is used to receive the oil dispersed by the guide section, allowing the oil to flow along its dispersion section and further disperse the oil, making it easier to filter impurities in the oil. The lower side of the guide section of the interceptor net 45 is aligned with the upper side of the discharge pipe 43, and the lower side of the dispersion section of the interceptor net 45 is fixed to the collection shell 41. The dispersion section is located outside the guide section. At the same time, the inverted frustum-shaped structure of the guide section of the interceptor net 45 facilitates the entry of impurities in the oil from other positions into the interceptor net 45, and makes it difficult for impurities that have entered the interceptor net 45 to re-enter the oil. Its structure is similar to that of existing shrimp traps.

[0058] The specific operation process of this embodiment is as follows:

[0059] Based on Embodiment 1, during the process of oil entering the rotary chamber 1000 along the second oil passage 800, the oil first enters the adjacent discharge pipe 43 through the second oil passage 800, and then the oil is sprayed out through the discharge pipe 43 and sprayed onto the interception net 45. The interception net 45 intercepts large impurities in the oil. During this process, the guide part and the dispersion part of the interception net 45 work together to filter the oil, so that the large impurities in the oil are retained in the interception net 45. Subsequently, the large impurities are guided into the collection shell 41 under the guidance of the dispersion part of the interception net 45. During the use of this electric control valve, the collection shell 41 is replaced periodically.

[0060] During the process of the oil flowing back to the corresponding working chamber 900 along the second oil passage 800, the oil first enters the discharge pipe 43 through the interception net 45, then enters the second oil passage 800, and finally flows back to the corresponding working chamber 900.

[0061] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims

1. An electrically controlled valve for a closed-loop hydraulic pump, characterized in that, The device includes an outer shell (1), a valve body (2) fixedly connected inside the outer shell (1), electromagnetic drive components (3) installed on both sides of the outer shell (1), a first valve core (4) slidably connected inside the valve body (2), a second valve core (5) threadedly connected to both sides of the first valve core (4), a third valve core (6) threadedly connected to the side of the second valve core (5) away from the first valve core (4), the drive end of the electromagnetic drive component (3) is used to push the third valve core (6) to move, the second valve core (5) is rotatably connected to a first guide ring (7), a support rod (8) fixedly connected inside the valve body (2), a feedback rod (9) fixedly connected to the support rod (8), a valve control system and a flow system are provided inside the valve body (2), the valve control system is used to control the swing of the feedback rod (9), and the flow system is used to provide space for the oil circuit changes inside the valve body (2); The first guide ring (7) is frustum-shaped; The first guide ring (7) has circumferentially distributed guide protrusions (21) fixedly attached to it. A second guide ring (31) is rotatably connected to the third valve core (6), and the second guide ring (31) contacts the adjacent second valve core (5); The second guide ring (31) is fixed with circumferentially distributed guide protrusions (32). The outer side of the projection of the second guide ring (31) onto the plane passing through its axis is arc-shaped.

2. The electrically controlled valve for a closed-loop hydraulic pump according to claim 1, characterized in that, The circulation system consists of a first oil outlet (100), a second oil outlet (200), a first oil inlet (300), a second oil inlet (400), a first oil return (500), a second oil return (600), a first oil passage (700), a second oil passage (800), a working chamber (900), a rotary chamber (1000), and an oil discharge (1100). The first oil outlet (100), the first oil inlet (300), the first oil return (500), and the first oil passage (700) are all located on one side of the valve body (2), while the second oil outlet (200), the second oil inlet (400), the second oil return (600), and the second oil passage (800) are all located on the other side of the valve body (2). There are two working chambers (900), both of which are located within the valve body (2). The first valve core (4) is located in one of the two working chambers. The working chamber (900) slides, and the two second valve cores (5) and the two third valve cores (6) slide in adjacent working chambers (900) respectively. The first oil outlet (100), the second oil outlet (200), the first oil inlet (300), the second oil inlet (400), the first oil return (500), the second oil return (600), the first oil passage (700), and the second oil passage (800) are respectively connected to the adjacent working chambers (900). The rotary chamber (1000) is set in the valve body (2). The first oil return (500), the second oil return (600), the first oil passage (700), and the second oil passage (800) are all connected to the rotary chamber (1000). The oil discharge passage (1100) is set on the support rod (8) and is connected to the rotary chamber (1000).

3. The electrically controlled valve for a closed-loop hydraulic pump according to claim 2, characterized in that, The number of the first oil passage (700) and the second oil passage (800) is at least two.

4. The electrically controlled valve for a closed-loop hydraulic pump according to claim 3, characterized in that, It also includes: A collection shell (41) is installed inside the rotary cavity (1000). The collection shell (41) is provided with a number of connecting ports. The number of connecting ports is the same as the sum of the number of all first oil passages (700) and all second oil passages (800). A fixing post (42) is fixedly connected to the connecting port of the collection shell (41). A discharge pipe (43) is fixedly connected to the fixing post (42). The first oil passage (700) and the second oil passage (800) are respectively connected to the adjacent discharge pipe (43). A fixing frame (44) is installed on the upper side of the fixing column (42), and an intercepting net (45) is fixedly connected to the fixing frame (44). The intercepting net (45) is fixedly connected to the collecting shell (41).

5. The electrically controlled valve for a closed-loop hydraulic pump according to claim 4, characterized in that, The interception net (45) has a flow guiding part and a dispersion part, wherein the flow guiding part is located inside the fixing frame (44) and is in the shape of an inverted frustum, and the dispersion part is located outside the flow guiding part.

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