Internal leakage regulating device, regulating method thereof and pump

Abstract

The present invention discloses an internal leakage regulating device, comprising a regulating valve sleeve and a valve core. The valve core is connected to the regulating valve sleeve in a rotary adjustable sealing manner. The regulating valve sleeve is provided with an internal leakage regulating hole. The valve core and the internal leakage regulating hole are arranged in a screw-in conductive manner. The regulating flow of the internal leakage regulating hole is arranged in linear proportion to the displacement of the valve core. Also disclosed are a method for regulating the internal leakage regulating device and a pump equipped with the internal leakage regulating device. The internal leakage regulating device is convenient, quick, and more accurate to adjust, and can meet the use requirements of the pump under special conditions. The internal leakage regulating device can be widely used in various pumps, greatly improving the application occasions and use range of the pump.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and in particular to an internal leakage regulating device, a regulating method thereof, and a pump. Background Art

[0002] There are many common regulating valves used in hydraulic pumps and other pump bodies. The most commonly used is the conical seal. This conical seal is suitable for use in situations where the requirements are not high. However, it cannot meet production needs when the requirements are high or there are special requirements.

[0003] A Chinese patent document (publication date: July 3, 2013, publication number: CN203035990U) discloses a horizontal type small flow linear regulating valve, comprising a handwheel, an adjusting screw, a pressure cap, a plunger valve core, a screw seal, a valve core seal, a valve sleeve and a central regulating tube. The pressure cap is crimped onto the valve sleeve, the adjusting screw passes through the pressure cap and is connected to the plunger valve core in the valve sleeve, the adjusting screw and the plunger valve core are respectively provided with a screw seal and a valve core seal, one end of the central regulating tube is sealed through the valve sleeve wall of the valve sleeve and is disposed in the valve sleeve, and the other end is disposed outside the valve sleeve as a first valve port end, a linear regulating passage is provided on the pipe wall of the central regulating pipe in the valve sleeve, the plunger valve core is movably disposed in the central regulating pipe, and a second valve port end is provided on the valve sleeve, so that the first valve port end, the linear regulating passage and the second valve port end are maintained in communication. The valve sleeve has the advantages of simple structure, easy manufacturing, accurate flow control, and easy installation and use.

[0004] The micro-flow linear regulating valve in the above technical solution is mainly used to control the flow in pipelines, but the regulating valve cannot be used on various pumps to achieve fine-tuning of the flow and internal leakage of the pump.

[0005] Therefore, it is urgent to design an internal leakage regulating device that can meet the needs of special use conditions and can fine-tune the pump's output flow, internal leakage and other parameters. Summary of the Invention

[0006] The purpose of the present invention is to provide a leakage regulating device and a regulating method thereof that can achieve precise regulation of parameters such as the internal leakage of the pump and meet the needs of special conditions, in view of the fact that the existing technical scheme of the pump regulating valve cannot meet the requirements of fine-tuning of parameters such as the internal leakage in special circumstances, and at the same time provide a pump with the internal leakage regulating device.

[0007] The technical solution adopted by the present invention to achieve its first invention purpose is: an internal leakage regulating device, including a regulating valve sleeve and a valve core, the valve core and the regulating valve sleeve are rotationally regulated and sealed, the regulating valve sleeve is provided with an internal leakage regulating hole, the valve core and the internal leakage regulating hole are screwed into each other, and the regulating flow of the internal leakage regulating hole is linearly proportional to the displacement of the valve core. The internal leakage regulating device is configured to open an internal leakage regulating hole on the regulating valve sleeve, so that the valve core can be rotated in and out inside the regulating valve sleeve. Therefore, the valve core has a relative displacement relative to the internal leakage regulating hole, and the forward and backward movement of the valve core and the size of the movement displacement are proportional to the internal leakage regulating hole. That is to say, when the axial displacement of the valve core along the regulating valve sleeve is proportional to the flow of the internal leakage regulating hole, when it is necessary to discharge a flow of Nml, due to the linear proportional relationship, the adjustment can be achieved directly by adjusting the displacement of the valve core. Moreover, this adjustment is convenient, fast, and more accurate, and can meet the use requirements of the pump under special conditions. The internal leakage regulating device can be widely used in servo pumps, such as vane pumps, gear pumps and other pumps for flow regulation and internal leakage regulation.

[0008] Preferably, the internal leakage adjustment hole is formed along the axial direction of the regulating valve sleeve and extends radially through the regulating valve sleeve. The length of the internal leakage adjustment hole is formed along the axial direction and extends radially through the regulating valve sleeve. With this structure, the displacement of the valve core when rotating in and out determines the opening size of the internal leakage adjustment hole, thereby achieving flow control.

[0009] Preferably, the internal leakage regulating hole is configured as an elongated strip hole. This structure is conducive to controlling the flow of the internal leakage regulating hole by the rotation in and out displacement of the valve core, thereby achieving fine adjustment.

[0010] Preferably, the internal leakage regulating hole is a plurality of circular holes of equal diameter arranged at equal intervals along the axial direction of the regulating valve sleeve, and the spacing between the circular holes is smaller than the diameter of the circular hole. In order to more conveniently and quickly adjust the internal leakage, the internal leakage regulating hole can be arranged as a plurality of circular holes of equal diameter and equal intervals, and the diameter of the circular hole is constant. At the same time, in order to meet the requirement that the adjustment flow of the internal leakage regulating hole is linearly proportional to the displacement of the valve core, the spacing between the circular holes is smaller than the diameter of the circular hole, and the spacing between the circular holes needs to be small enough so that the spacing can be ignored during the adjustment process. When the valve core opens one internal leakage regulating hole, the required flow can be discharged. When the leakage flow needs to be increased, the corresponding two or more internal leakage regulating holes can be opened. Similarly, the adjustment flow is also linearly proportional to the displacement of the valve core.

[0011] Preferably, the valve core is provided with a rotating component. The valve core is provided with a stepped structure having a rotating connection portion, a sealing portion, and a flow adjustment portion. The outer diameter of the rotating connection portion is provided with a valve core adjustment thread, and the outer diameter of the sealing portion is provided with a dynamic seal. The rotating component is provided on the valve core to facilitate the control of the displacement of the valve core when it is screwed in and out. The rotating component can be manually or automatically adjusted. When manual, the rotating component can be configured as an operating component such as a handwheel, while when automatically adjusted, it can be an electronic control component such as a drive motor. The valve core is provided with a stepped structure and a rotating connection portion for mating with the internal threads of the regulating valve sleeve to achieve the valve core's screwing in and out and locking. The sealing portion is used to achieve a sealed cooperation between the valve core and the regulating valve sleeve, especially to achieve dynamic sealing during dynamic regulation. The flow regulating portion cooperates with the internal leakage regulating hole to adjust the flow rate and internal leakage. That is, when setting the valve core, the diameter and length of the valve core and the opening size of the internal leakage regulating hole are pre-designed according to the required regulation amount, so that the displacement of the valve core is proportional to the flow rate of the internal leakage regulating hole. When the valve core is rotated outward from the regulating valve seat, the flow regulating portion has a relative displacement with respect to the internal leakage regulating hole. The size of the displacement determines the degree of opening of the internal leakage regulating hole, that is, the size of the flow regulation amount, thereby achieving precise adjustment of the internal flow rate or internal leakage. The specific design is to make the displacement of the valve core proportional to the area of ​​the internal leakage regulating hole, and thus proportional to the flow rate passing through the internal leakage regulating hole.

[0012] Preferably, the regulating valve sleeve is provided with a valve sleeve body, a connecting portion and a flow regulating portion in a stepped cylindrical structure. The interior of the valve sleeve body is provided with a valve sleeve internal thread in conjunction with the valve core regulating thread. A valve sleeve seal is provided on the outer wall of the connection between the connecting portion and the valve sleeve body. A connecting external thread is provided on the outside of the connecting portion. A static seal is provided on the outer diameter of the end of the flow regulating portion. The regulating valve sleeve is provided with a valve sleeve body in a stepped cylindrical structure for realizing the setting of the valve core, and the setting of the connecting portion is for realizing the connection between the internal leakage regulating device and the pump. The setting of the connecting external thread on the outside of the connecting portion can realize a sealed connection with the pump. The flow regulating portion is provided to facilitate the opening of the internal leakage regulating hole and the adjustment of the screwing-in and screwing-out displacement of the flow regulating portion on the valve core. The flow regulating portion needs to be connected to the pump when in use and also needs to conduct the oil circuit. Therefore, a static seal is provided on the outer diameter of its end to realize the connection seal.

[0013] Preferably, a valve core cavity is provided inside the valve sleeve body and the connecting part, a flow regulating cavity and a circulation cavity are provided inside the flow regulating part, the diameter of the flow regulating cavity is matched with the outer diameter of the valve core, the circulation cavity and the flow regulating cavity are arranged in a stepped hole structure and the diameter of the circulation cavity is smaller than the diameter of the flow regulating cavity, the valve core is rotationally adjusted and arranged inside the valve core cavity and extends into the flow regulating cavity, the internal leakage adjustment hole is provided in the flow regulating part and communicates with the flow regulating cavity. The valve core cavity is provided inside the valve sleeve body and the connecting part, which can facilitate the threaded connection of the valve core with the valve core and implement the screwing in and out of the valve core, and the flow regulating cavity is used to cooperate with the internal leakage adjustment hole to realize the communication of the oil circuits in the low-pressure zone and the high-pressure zone, thereby realizing the regulation of the oil volume or internal leakage, and the circulation cavity is used to realize the regulation and conduction of the oil circuit.

[0014] The technical solution adopted by the present invention to achieve the second invention object is: a method for adjusting an internal leakage regulating device, comprising the following steps:

[0015] Step 1: Set the opening size and area of ​​the internal leakage regulating hole according to the flow rate to be adjusted, and set the diameter of the flow regulating cavity inside the regulating valve sleeve, and set the cross-sectional area and travel of the valve core accordingly;

[0016] Step 2: Adjustment of flow and internal leakage: When fine-tuning of the flow is required and internal leakage is achieved, the valve core is adjusted to move axially relative to the internal leakage adjustment hole, so that the valve core has a relative axial displacement relative to the flow adjustment chamber. This achieves internal leakage adjustment from the high-pressure area to the low-pressure area, thereby achieving overall flow adjustment.

[0017] When the flow or internal leakage is required to be constant, the valve core is adjusted to the required position according to the required flow or internal leakage requirements, and the relative flow or internal leakage control will be maintained;

[0018] Step 3: Rotate the valve core toward the inside of the regulating valve sleeve to completely close the flow regulating chamber, thereby closing the flow or internal leakage regulating function.

[0019] The adjustment method of the internal leakage regulating device is simple and quick to operate, and the adjustment is precise. The flow area of ​​the internal leakage regulating hole is controlled by linear changes in the valve core displacement to achieve effective adjustment. That is, each time the valve core rotates one circle, the same volumetric efficiency change value (pressure maintaining speed) can be correspondingly changed.

[0020] Preferably, the internal leakage regulating device adopts manual or automatic control.

[0021] The technical solution adopted by the present invention to achieve its third invention purpose is: a pump with an internal leakage adjustment device, wherein the pump body is provided with a high-pressure leakage hole and a low-pressure leakage hole for communicating with the internal leakage adjustment hole, and the internal leakage adjustment device is internally sealed and connected to the pump, or externally connected to the outside of the pump through a pipeline. The internal leakage adjustment device is applied to various pumps, which can be internal meshing pumps, T7 series pumps, other vane pumps, gear pumps, plunger pumps, etc., and can be widely used in pumps to achieve effective and precise adjustment of the internal leakage of the pump, etc., so that the pump has a wider range of use and can better meet the needs of various special use conditions.

[0022] The beneficial effects of the present invention are: the internal leakage regulating device is convenient and quick to adjust, and is more accurate, and can meet the use requirements of the pump under special conditions. The internal leakage regulating device can be widely used in various pumps, greatly improving the application occasions and use range of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the internal leakage regulating device of the present invention;

[0024] Figure 2 It is a cross-sectional view of the internal leakage regulating device of the present invention in a closed state;

[0025] Figure 3 It is a cross-sectional view of the internal leakage regulating device of the present invention in an open state;

[0026] Figure 4 It is a proportional relationship diagram between the valve core displacement and the flow rate in the present invention;

[0027] Figure 5 This is a diagram showing the proportional relationship between the valve core displacement and the motor speed change in the present invention;

[0028] Figure 6 This is a structural schematic diagram of the internal leakage regulating device of the present invention applied to a pump in a closed state;

[0029] Figure 7 This is a structural schematic diagram of the internal leakage regulating device of the present invention applied to a pump in a conducting state;

[0030] Figure 8 This is a simplified functional diagram of the internal leakage regulating device;

[0031] Figure 9 This is a schematic diagram of an internal flow path structure in which the internal leakage regulating device of the present invention is arranged on a pump body;

[0032] Figure 10 This is a structural schematic diagram of the internal leakage regulating device in the present invention in a leakage state;

[0033] Figure 11 This is a diagram showing the proportional relationship between the relative displacement of the valve core and the discharge regulating hole and the discharge area in the present invention;

[0034] Figure 12 This is a diagram showing the proportional relationship between the relative displacement of the valve core and the discharge regulating hole and the discharge flow rate in the present invention;

[0035] Figure 13 This is a diagram showing the proportional relationship between the relative displacement of the valve core and the discharge regulating hole and the pressure maintaining speed in the present invention;

[0036] Figure 14 This is a structural diagram of the internal leakage regulating device in Example 3 of the present invention;

[0037] In the figure: 1. regulating valve sleeve, 2. valve core, 3. internal leakage adjustment hole, 4. rotating component, 5. low-pressure area, 6. high-pressure area, 7. pump body, 8. pump main assembly, 9. pump cover, 10. circulation chamber, 11. valve sleeve body, 12. connecting part, 13. flow adjustment part, 14. valve sleeve internal thread, 15. valve sleeve seal, 16. connecting external thread, 17. static seal, 18. valve core chamber, 19. flow adjustment chamber, 21. rotating connecting part, 22. sealing part, 23. flow adjustment part, 24. valve core adjusting thread, 25. dynamic seal, 26. high-pressure leakage hole, 27. low-pressure reflux hole. DETAILED DESCRIPTION

[0038] The various aspects of the present invention are described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0039] Example 1:

[0040] In Figure 1, Figure 2 、 Figure 3 In the embodiment shown, an internal leakage regulating device comprises a regulating valve sleeve 1 and a valve core 2. The valve core 2 is connected to the regulating valve sleeve 1 in a rotary adjustable sealing manner. The regulating valve sleeve 1 is provided with an internal leakage regulating hole 3. The valve core 2 is connected to the internal leakage regulating hole 3 in a screw-type conductive arrangement. The regulating flow of the internal leakage regulating hole 3 is linearly proportional to the displacement of the valve core 2. Figure 4 As shown, the flow rate is proportional to the valve core displacement, and the leakage flow rate can be controlled by the size of the valve core displacement. Figure 4 The node D in the figure is the node before and after the discharge. The total flow rate L after the discharge is equal to the flow rate Qq under the condition of no flow restriction. Figure 5 As shown in the figure, when an industrial servo pump is working at 140MPa / 175MPa pressure, the flow area of ​​the internal leakage adjustment hole is controlled by linear changes in the valve core displacement to achieve effective adjustment, that is, each rotation of the valve core can change the same pressure maintenance speed. Figure 5Node E represents the node before and after flow relief. After flow relief, the motor speed r = the speed R in the unlimited flow condition + n. This allows for adjustable pressure-maintaining speed, adapting to specific speed requirements. The internal leakage adjustment hole 3 is axially extending along the regulating valve sleeve 1 and extends radially through the regulating valve sleeve 1. The length of the internal leakage adjustment hole is axially extending, extending radially through the regulating valve sleeve. With this structure, the displacement of the valve core in and out determines the opening size of the internal leakage adjustment hole, thereby achieving flow control.

[0041] The internal leakage regulating hole 3 is provided as an elongated strip hole. The internal leakage regulating hole is provided as an elongated strip hole. Such a structure is conducive to controlling the flow of the internal leakage regulating hole by the rotation in and out displacement of the valve core, thereby achieving fine adjustment.

[0042] The valve core 2 is provided with a rotating component 4, which can be manual or automatically adjusted. When manual, the rotating component 4 can be configured as an operating component such as a hand wheel, while when automatically adjusted, it can be an electronic control component such as a drive motor. In this embodiment, the placement component 4 adopts a hand wheel structure. When specifically configured, the relationship between the angle of hand wheel rotation and the displacement of the valve core is pre-set, such as Figure 10 As shown, when the handwheel is rotated Y degrees, the displacement of the valve core is L, and the conduction area of ​​the internal leakage adjustment hole is A. At this point, the corresponding internal leakage can reach the desired amount Xml. Therefore, during operation, to achieve a flow rate or internal leakage of Xml, one only needs to rotate the handwheel externally by Y degrees, making adjustment convenient, quick, and precise. In another embodiment, the rotating component 4 can also be automatically adjustable, for example, it can be a drive disk. The drive motor drives the drive disk to rotate a corresponding angle to achieve automatic adjustment. In this case, the drive motor is connected to the control system signal. When the control system issues a command to adjust the flow rate Xml, the drive motor drives the drive disk to rotate Y degrees. At this time, the displacement of the valve core is L, and the conduction area of ​​the internal leakage adjustment hole is A (the length a of the internal leakage adjustment hole multiplied by the width b), thus smoothly adjusting the flow rate or internal leakage.

[0043] like Figure 11 As shown in FIG, the relationship between the discharge area S of the discharge regulating hole and the relative displacement ΔL between the valve core and the discharge regulating hole is: S=ΔL*b S is the discharge area of ​​the discharge valve, ΔL is the relative displacement of the slender slit of the valve core, and b is the slit width.

[0044] like Figure 12 As shown, the discharge flow rate q=k*S=k*ΔL*b, where k is the coefficient of the discharge area and discharge flow rate under equal regulation, and is a constant.

[0045] q=n*p, where n is the pressure-maintaining speed adjustment value and p is the pump displacement. When maintaining pressure, it can be understood this way: to maintain constant pressure, the loss of flow requires an equivalent flow of n*p to offset it.

[0046] like Figure 13 As shown, the pressure holding speed adjustment value n=k / p*W*ΔL, k / p*W is still a constant, so n and ΔL are also in a linear relationship.

[0047] like Figure 2 As shown, in this embodiment, the valve core 2 is provided with a stepped structure comprising a rotary connection portion 21, a sealing portion 22, and a flow control portion 23. The outer diameter of the rotary connection portion 21 is provided with a valve core adjustment thread 24, and the outer diameter of the sealing portion 22 is provided with a dynamic seal 25. In this embodiment, the valve core adopts an integrated structure. The rotary connection portion provided on the valve core 2 facilitates its internal threaded connection with the regulating valve sleeve, enabling effective rotation and locking of the valve core. To achieve a sealed fit between the valve core 2 and the regulating valve sleeve 1, a sealing portion 22 is provided to achieve dynamic sealing between the valve core and the regulating valve sleeve during the dynamic adjustment process of the valve core. The flow regulating portion 23 cooperates with the internal leakage regulating hole 3 to adjust the flow and internal leakage. When setting the valve core 2, the specific structural parameters such as the diameter and length of the valve core, as well as the opening size of the internal leakage regulating hole 3, that is, the flow area, are designed in advance according to the need for the adjustment amount. The displacement of the valve core is proportional to the flow of the internal leakage regulating hole. When the valve core is rotated outward from the regulating valve seat, the flow regulating portion has a relative displacement relative to the internal leakage regulating hole. The size of the displacement determines the amount of opening of the flow area of ​​the internal leakage regulating hole, that is, the size of the flow regulation, thereby achieving precise adjustment of the internal flow or internal leakage. The specific design requirement is that the displacement of the valve core is proportional to the area of ​​the internal leakage regulating hole, and thus proportional to the flow passing through the internal leakage regulating hole.

[0048] like Figure 3As shown, in this embodiment, the regulating valve sleeve 1 is a stepped cylindrical structure and is provided with a valve sleeve body 11, a connecting portion 12 and a flow regulating portion 13. The regulating valve sleeve 1 is an integrated structure. The interior of the valve sleeve body 11 is provided with a valve sleeve internal thread 14 in cooperation with the valve core adjusting thread 24. A valve sleeve seal 15 is provided on the outer wall of the connection between the connecting portion 12 and the valve sleeve body 11. A connecting external thread 16 is provided on the outside of the connecting portion 12. A static seal 17 is provided on the outer diameter of the end of the flow regulating portion 13. In this embodiment, the regulating valve sleeve 1 is an integrated stepped cylindrical structure, and the valve sleeve body 11 is used to cooperate with the valve core 2 to realize a threaded connection between the valve core and the regulating valve sleeve. The connecting part 2 on the regulating valve sleeve can realize a quick connection and sealing between the internal leakage regulating device and the pump through threads. An internal leakage regulating hole 3 is provided on the flow regulating part 13, which cooperates with the flow regulating part on the valve core to realize the adjustment of the displacement of the valve core in and out, and then realize the adjustment of the flow area of ​​the internal leakage regulating hole, thereby realizing linear adjustment of the flow rate. The flow regulating part needs to be connected to the pump when in use, and also needs to conduct the oil circuit. Therefore, a static seal is provided on the outer diameter of its end to realize connection sealing.

[0049] The valve sleeve body 11 and the connecting portion 12 are internally provided with a valve core cavity 18, and the flow regulating portion 13 is internally provided with a flow regulating cavity 19 and a circulation cavity 10. The diameter of the flow regulating cavity 19 is matched with the outer diameter of the valve core 2. The circulation cavity 10 and the flow regulating cavity 19 are arranged in a stepped hole structure, and the diameter of the circulation cavity 10 is smaller than the diameter of the flow regulating cavity 19. The diameter of the flow regulating cavity is matched with the valve core to realize the conduction and cut-off operation of the valve core on the internal leakage regulating hole. When it is necessary to completely close the internal leakage regulating device, the valve core rotates into the flow regulating cavity and abuts against the end face of the connection between the flow regulating cavity and the circulation cavity, thereby realizing the full closing operation of the internal leakage regulating device. The valve core 2 is rotationally adjusted and arranged inside the valve core cavity 15 and extends into the flow regulating cavity 19. The internal leakage regulating hole 3 is opened in the flow regulating portion and communicates with the flow regulating cavity. A valve core cavity is provided inside the valve sleeve body and the connecting part, and the valve core is threadedly connected inside the valve core cavity, so that the valve core can be screwed in and out. At the same time, the valve core and the flow regulating cavity cooperate with the internal leakage regulating hole to realize the connection of the oil circuits in the low-pressure area and the high-pressure area, thereby realizing the adjustment of the oil volume or the internal leakage volume. The flow cavity is used to realize the adjustment and conduction of the oil circuit.

[0050] The internal leakage regulating device in the above embodiment is configured such that an internal leakage regulating hole is provided on the regulating valve sleeve, and the valve core can be rotated in and out inside the regulating valve sleeve. Therefore, the valve core has a relative displacement relative to the internal leakage regulating hole, and the forward and backward movement of the valve core and the size of the movement displacement are proportional to the internal leakage regulating hole. That is to say, when the axial displacement of the valve core along the regulating valve sleeve is proportional to the flow rate of the internal leakage regulating hole, when it is necessary to discharge a flow rate of Nml, due to the linear proportional relationship, the adjustment can be achieved directly by adjusting the displacement of the valve core. Moreover, this adjustment is convenient, fast, and more accurate, and can meet the use requirements of the pump under special conditions. The internal leakage regulating device can be widely used in servo pumps, such as vane pumps, gear pumps and other pumps for flow regulation and internal leakage regulation.

[0051] like Figure 6 、 Figure 7 As shown, when the internal leakage regulating device is applied to the pump, Figure 6 It shows the situation where the low-pressure area and the high-pressure area are not connected and the internal leakage regulating device is in a closed state. Figure 7 It shows that when a certain amount of flow regulation is required, the valve core is rotated outwards by a certain amount of displacement. At this time, the low-pressure area and the high-pressure area are connected, and the oil flows from the high-pressure area, the flow regulating chamber 19, the circulation chamber 10, through the internal leakage regulating hole 3, to the low-low area, thereby achieving internal leakage, which can effectively achieve fine-tuning of the pump flow. When the internal leakage regulating valve is externally connected to the pump application, Figure 6 、 7 The middle section line section is equivalent to a valve block. The oil port on the high-pressure side is connected to the oil outlet pipe of the pump, and the oil hole on the low-pressure side is directly connected to the oil tank. The working principle is the same as above.

[0052] For example, when a lifting platform requires 10 pumps to realize the lifting operation, the speed of the 10 pumps is constant. If it is necessary to realize the simultaneous lifting and lowering of the 10 pumps, although the pump displacement and other parameters are the same in theory, there will be many differences in actual work. The internal leakage adjustment device can achieve precise fine-tuning, truly realizing the simultaneous lifting and lowering of the 10 pumps.

[0053] like Figure 8 、 Figure 9 As shown, a pump with an internal leakage device is provided with a high-pressure leakage hole 26 and a low-pressure leakage hole 27 for communicating with the internal leakage adjustment hole. The internal leakage adjustment device is internally sealed and connected to the pump, or externally connected to the pump via a pipeline. In this embodiment, the internal leakage adjustment device is externally connected to the pump via a pipeline.

[0054] In this embodiment, the pump is an internal meshing hydraulic pump, and a low-pressure zone 5 and a high-pressure zone 6 are provided inside the pump, and the internal leakage regulating device is provided at the connection point between the low-pressure zone 5 and the high-pressure zone 6. The internal leakage regulating device is provided on the hydraulic pump, which can realize effective and precise adjustment of the output flow and internal leakage of the hydraulic pump, so that the hydraulic pump has a wider range of use and can better meet the needs of various special use conditions. The hydraulic pump also includes a pump body 7, a pump main body assembly 8 and a pump cover 9. The internal leakage regulating device is provided on the pump cover or the pump body and connects the low-pressure zone and the high-pressure zone. The hydraulic pump in this embodiment adopts the PV series product, the internal leakage regulating device is provided on the pump cover, and the pump main body assembly 8 includes components such as the pump main shaft, inner and outer rotors, and a gear ring.

[0055] It should be noted that the normal flow of the pump is not limited by the internal leakage regulating device, but the internal leakage regulating device controls and regulates the internal leakage under normal working conditions of the pump, thereby achieving fine-tuning of the overall flow of the pump.

[0056] like Figure 5 As shown, the adjustment method of the internal leakage regulating device includes the following steps: setting the opening size of the internal leakage regulating hole 3, i.e., the length a, width b, and area A, according to the flow rate Xml to be adjusted, and at the same time setting the cavity diameter of the flow regulating cavity inside the regulating valve sleeve, and correspondingly setting the cross-sectional area and movement stroke of the valve core;

[0057] like Figure 7 As shown in the figure, when fine adjustment of the flow rate is required, the axial displacement of the valve core relative to the internal leakage adjustment hole is adjusted manually or automatically, so that the valve core has a relative displacement L in the axial direction relative to the flow adjustment chamber. At this time, the low-pressure area and the high-pressure area are connected through the fine adjustment hole 3, and the oil flows from the low-pressure area to the high-pressure area, thereby realizing the adjustment of the flow rate from the low-pressure area to the high-pressure area;

[0058] As shown in Figure 10, when internal leakage is required, the regulating valve core is axially displaced relative to the internal leakage adjustment hole, causing the valve core to have a relative axial displacement L relative to the flow control chamber. At this time, the high-pressure area and the low-pressure area are connected through the internal leakage adjustment hole 3, and the oil is discharged from the high-pressure area to the low-pressure area, thus achieving internal leakage adjustment from the high-pressure area to the low-pressure area.

[0059] When the flow or internal leakage is required to be constant, the valve core is adjusted to the required position according to the required flow or internal leakage requirements, and the relative flow or internal leakage control will be maintained;

[0060] like Figure 6 As shown, rotate the valve core toward the inside of the regulating valve sleeve to completely close the flow regulating chamber, thereby closing the flow or internal leakage regulating function.

[0061] The adjustment method of the internal leakage adjustment device is simple and quick to operate, and the adjustment is precise.

[0062] Example 2:

[0063] exist Figure 10 In the embodiment shown, the technical solution is basically the same as that of embodiment 1, except that the internal leakage regulating device is connected to the pump in a built-in seal.

[0064] Example 3:

[0065] exist Figure 14 The illustrated embodiment employs a technical solution essentially identical to that of Example 1, differing in that the internal leakage adjustment holes 3 are arranged as multiple circular holes of equal diameter, spaced axially along the regulating valve sleeve. The spacing between the holes is sufficiently small to be negligible during valve core displacement adjustment. Furthermore, the spacing between the holes is smaller than their diameters. This structure ensures a proportional relationship between the leakage rate and valve core displacement during adjustment, while also eliminating the need for an external rotation angle. A predetermined number of rotations is all that is required to open the corresponding internal leakage adjustment hole, achieving the desired leakage rate.

[0066] This internal leakage control device can be universally applied to any pump, including internal meshing hydraulic pumps, the T7 series, and other vane pumps, gear pumps, and plunger pumps. It can be installed on the pump body, returning oil from the outlet (high-pressure area) to the inlet (low-pressure area). It can also be installed in a bypass (outside the pump), returning oil directly from the outlet to the tank. It can be used for both synchronous regulation of multiple cylinders in multi-circuit systems and speed control in servo pressure-maintaining systems. For example, in an internal meshing hydraulic pump, a customer may require a 100 rpm speed during pressure maintenance, while the standard product is 50 rpm. By adding this internal leakage control device, the customer can increase the speed from 50 rpm to 100 or even higher. The valve core can be linearly controlled, with each rotation of the handwheel corresponding to a fixed amount of internal leakage flow, making it easy for users to adjust the valve opening.

[0067] It should be noted that the above description is an embodiment of the present invention. However, those skilled in the art should understand that the present invention is not limited to the above embodiment. The above embodiment is only for illustrating the principle of the present invention. The present invention may be subject to various changes and improvements without departing from the scope of the present invention. These changes and improvements fall within the scope of the invention claimed. Based on the embodiments described in the present invention, all other embodiments obtained by those of ordinary skill in the art on the basis of the technical solution of the present application without making any creative work should fall within the scope of protection of the present invention.

Claims

1. An internal leakage regulating device, applied to a pump, characterized by: The invention comprises a regulating valve sleeve (1) and a valve core (2), wherein the valve core (2) is connected to the regulating valve sleeve (1) in a rotary regulating sealing manner, an internal leakage regulating hole (3) is provided on the regulating valve sleeve (1), the valve core (2) and the internal leakage regulating hole (3) are arranged to be screwed in and communicated with each other, and the regulating flow of the internal leakage regulating hole (3) is arranged to be linearly proportional to the displacement of the valve core; a flow regulating part and a rotating component are provided on the valve core, and the internal leakage regulating hole cooperates with the flow regulating part on the valve core to achieve the adjustment of the displacement of the valve core when it is screwed in and out, thereby achieving the adjustment of the flow area of ​​the internal leakage regulating hole, and the flow area of ​​the internal leakage regulating hole is controlled by the linear change of the displacement of the valve core, and the rotating component controls the displacement of the valve core when it is screwed in and out, and the same pressure maintaining speed can be changed correspondingly for each rotation of the valve core; the normal flow of the pump is not limited by the internal leakage regulating device, and under the normal working condition of the pump, the internal leakage is controlled and adjusted to achieve the micro-adjustment of the overall flow of the pump.

2. The internal leakage regulating device according to claim 1, characterized in that: The internal leakage regulating hole (3) is opened along the axial direction of the regulating valve sleeve (1), and the internal leakage regulating hole (3) passes through the radial direction of the regulating valve sleeve (1).

3. The internal leakage regulating device according to claim 1, characterized in that: The internal leakage regulating hole (3) is provided as an elongated strip-shaped hole.

4. The internal leakage regulating device according to claim 1, characterized in that: The internal leakage regulating hole (3) is a plurality of circular holes of equal diameter arranged at equal intervals along the axial direction of the regulating valve sleeve, and the intervals between the circular holes are smaller than the diameters of the circular holes.

5. The internal leakage regulating device according to any one of claims 1 to 4, characterized in that: The valve core (2) is provided with a rotating connection part (21), a sealing part (22) and a flow regulating part (23) in a stepped structure. The outer diameter of the rotating connection part (21) is provided with a valve core regulating thread (24), and the outer diameter of the sealing part is provided with a dynamic sealing member (25).

6. The internal leakage regulating device according to any one of claims 1 to 4, characterized in that: The regulating valve sleeve (1) is in a stepped columnar structure and is provided with a valve sleeve body (11), a connecting portion (12) and a flow regulating portion (13); a valve sleeve internal thread (14) is provided inside the valve sleeve body (11); a valve sleeve seal (15) is provided on the outer wall of the connection between the connecting portion (12) and the valve sleeve body (11); a connecting external thread (16) is provided on the outside of the connecting portion (12); and a static seal (17) is provided on the outer diameter of the end of the flow regulating portion (13).

7. The internal leakage regulating device according to claim 5, characterized in that: The valve sleeve body (11) and the connecting portion (12) are provided with a valve core cavity (18), the flow regulating portion (13) is provided with a flow regulating cavity (19) and a circulation cavity (10), the cavity diameter of the flow regulating cavity (19) is matched with the outer diameter of the valve core (2), the circulation cavity (10) and the flow regulating cavity (19) are provided in a stepped hole structure, and the cavity diameter of the circulation cavity (10) is smaller than the cavity diameter of the flow regulating cavity (19), the valve core (2) is rotationally adjusted and arranged inside the valve core cavity (18) and extends into the flow regulating cavity (19), and the internal leakage adjustment hole (3) is opened in the flow regulating portion (13) and communicates with the flow regulating cavity (19).

8. A method for adjusting the internal leakage regulating device according to any one of claims 1 to 7, characterized in that The following steps are involved: Step 1: Set the opening size and area of ​​the internal leakage regulating hole according to the flow rate to be adjusted, and set the diameter of the flow regulating cavity inside the regulating valve sleeve, and set the cross-sectional area and travel of the valve core accordingly; Step 2: Adjustment of flow and internal leakage: When fine-tuning of the flow is required and internal leakage is achieved, the valve core is adjusted to move axially relative to the internal leakage adjustment hole, so that the valve core has a relative axial displacement relative to the flow adjustment chamber. This achieves internal leakage adjustment from the high-pressure area to the low-pressure area, thereby achieving overall flow adjustment. When the flow or internal leakage is required to be constant, the valve core is adjusted to the required position according to the required flow or internal leakage requirements, and the relative flow or internal leakage control will be maintained; Step 3: Rotate the valve core toward the inside of the regulating valve sleeve to completely close the flow regulating chamber, thereby closing the flow or internal leakage regulating function.

9. The method for adjusting the internal leakage regulating device according to claim 8, characterized in that: The internal leakage regulating device adopts manual or automatic control type.

10. A pump with the internal leakage regulating device according to any one of claims 1 to 7, characterized in that: The pump body is provided with a high-pressure leakage hole and a low-pressure leakage hole for communicating with the internal leakage adjustment hole. The internal leakage adjustment device is internally sealed and connected to the pump, or externally connected to the outside of the pump through a pipeline.

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