Bypass flow valve

Abstract

The bypass flow valve has a valve body with a first chamber, an oil inlet, an overflow port and an oil outlet, a pressure regulating valve sleeve fixedly installed in the first chamber and having a second chamber, the pressure regulating valve sleeve being provided with an overflow hole and an oil outlet hole, the overflow hole being communicated with the second chamber and the overflow port, the oil outlet hole being communicated with the second chamber and the oil outlet, a pressure regulating valve core being slidably fitted in the second chamber, the pressure regulating valve core having a third chamber, the third chamber being adapted to be communicated with the oil inlet and the overflow hole and with the oil inlet and the oil outlet hole, the pressure regulating valve core having a first critical position and a second critical position, the pressure regulating valve core gradually blocking the overflow hole and gradually avoiding the oil outlet hole when sliding towards the first critical position, the pressure regulating valve core gradually avoiding the overflow hole and gradually blocking the oil outlet hole when sliding towards the second critical position, and an elastic assembly being adapted to press the pressure regulating valve core towards the first critical position. The bypass flow valve has the advantage of high speed regulating stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the bypass valve technical field, specifically relates to a bypass flow valve. BACKGROUND

[0002] The bypass flow valve is mainly composed of a throttle valve and a differential pressure overflow valve, part of high pressure oil at an oil inlet of the bypass flow valve goes to an actuator from an oil outlet through the throttle valve, and the other part of the high pressure oil goes to an oil tank through an overflow port of the overflow valve, and the upper and lower ends of the overflow valve are communicated with the front and back of the throttle port. When the load increases or decreases, the valve core of the overflow valve moves correspondingly to reduce or increase the opening of the overflow valve, so that the pressure difference between the two ends of the throttle valve remains unchanged, thereby ensuring that the flow of oil through the throttle valve is substantially unchanged. Among them, the bypass flow valve can usually only be installed on the oil inlet of the actuator, and the flow through the bypass flow valve is larger than that of the general speed regulating valve (generally the total flow of the system), the resistance of the valve core is large when moving, and the spring is relatively hard (the elastic coefficient is large), and further the bypass flow valve has the defect of poor speed regulating stability under variable load conditions. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present application provides a bypass flow valve, which has the advantage of high speed regulating stability.

[0005] The bypass flow valve according to the embodiment of the present application comprises a valve body, a pressure regulating valve sleeve, a pressure regulating valve core and an elastic assembly, the valve body has a first chamber, the valve body further has an oil inlet, an overflow port and an oil outlet which are communicated with the first chamber; the pressure regulating valve sleeve is fixedly installed in the first chamber and has a second chamber, the pressure regulating valve sleeve is provided with an overflow hole and an oil outlet hole on the peripheral wall, the overflow hole is communicated with the second chamber and the overflow port, and the oil outlet hole is communicated with the second chamber and the oil outlet; the pressure regulating valve core is slidably fitted in the second chamber, the pressure regulating valve core has a third chamber, the third chamber is adapted to communicate the oil inlet with the overflow hole and to communicate the oil inlet with the oil outlet hole, the pressure regulating valve core has a first critical position and a second critical position, the pressure regulating valve core gradually blocks the overflow hole and gradually avoids the oil outlet hole when sliding towards the first critical position, and the pressure regulating valve core gradually avoids the overflow hole and gradually blocks the oil outlet hole when sliding towards the second critical position; and the elastic assembly is adapted to press the pressure regulating valve core towards the first critical position.

[0006] According to an embodiment of the bypass flow valve of the present invention, the valve body is suitable for being connected to a hydraulic pump through an oil inlet, connected to a liquid tank through an overflow port, and connected to a hydraulic cylinder through an oil outlet. The hydraulic pump draws hydraulic oil from the liquid tank into the oil inlet, part of which flows into the liquid tank via the third chamber, the overflow port, and the overflow port in sequence, and the remaining part flows into the hydraulic cylinder via the third chamber, the oil outlet port, and the oil outlet in sequence to drive the load under actual working conditions. When the load decreases, the pressure difference between the oil outlet and the overflow port increases, thereby driving the pressure regulating valve core to move toward the second critical position, thereby gradually increasing the flow area at the overflow port and gradually decreasing the flow area at the oil outlet port. The changes in the two flow areas simultaneously achieve flow diversion, so that the distance moved by the pressure regulating valve core when reaching force balance is smaller, and thus the elastic deformation of the elastic component is smaller, thereby effectively improving the speed regulation stability.

[0007] Similarly, when the load becomes larger, the pressure difference between the oil outlet and the overflow port decreases, thereby driving the pressure regulating valve core to move toward the first critical position, so that the flow area at the overflow hole gradually decreases, and the flow area at the oil outlet hole gradually increases. The changes in the flow areas at the two places simultaneously realize diversion, so that the distance moved by the pressure regulating valve core when reaching force balance is smaller, and the elastic deformation of the elastic component is smaller, thereby also effectively improving the speed regulation stability.

[0008] In some embodiments, the bypass flow valve further includes a throttle valve sleeve, a throttle valve core and a driving device, the throttle valve sleeve is fitted in the second chamber and has a fourth chamber, the throttle valve core is slidably fitted in the fourth chamber, a throttle channel with adjustable cross-sectional area is formed between the throttle valve core and the throttle valve sleeve, the oil inlet is suitable for communicating with the overflow hole through the third chamber, the fourth chamber and the throttle channel; the driving device is installed on the valve body, and the driving device is transmission-connected to the throttle valve core.

[0009] In some embodiments, the bypass flow valve also includes a threaded sleeve, which is threadedly connected to the valve body, and the inner cavity of the threaded sleeve is connected to the first chamber. The throttle valve core can be slidably fitted in the inner cavity of the threaded sleeve. A balance chamber surrounding the throttle valve core is formed between the throttle valve core and the threaded sleeve. The throttle valve core also has a first channel connected to the fourth chamber, and the peripheral wall of the throttle valve core is provided with a through hole connecting the first channel and the balance chamber. The balance chamber has a first limiting surface and a second limiting surface opposite to each other along the axial direction of the threaded sleeve. The first limiting surface is formed on the threaded sleeve, and the second limiting surface is formed on the throttle valve core. The first limiting surface is located on the side of the second limiting surface away from the fourth chamber.

[0010] In some embodiments, the driving device includes a linear stepper motor, the valve body has a first end face and a second end face opposite to each other along the axial direction of the first chamber, the linear stepper motor is installed on the first end face of the valve body, and the output shaft of the linear stepper motor is threadedly connected to the throttling valve core.

[0011] In some embodiments, the throttle valve core is provided with a first conical surface at one end away from the driving device, the inner wall surface of the throttle valve sleeve includes a second conical surface matching the first conical surface, the throttle channel is formed between the first conical surface and the second conical surface, and the peripheral wall of the throttle valve sleeve is provided with a throttle hole connecting the throttle channel and the oil outlet hole.

[0012] In some embodiments, the elastic component includes a guide rod and a spring, the guide rod is slidably engaged in the third chamber, the guide rod has a second channel connecting the oil inlet and the fourth chamber, the spring is engaged in the third chamber and is sleeved on the guide rod, the two ends of the spring are respectively connected to the pressure regulating valve core and the guide rod, and at least a portion of the throttle valve core is engaged in the third chamber and abuts against the guide rod.

[0013] In some embodiments, the pressure regulating valve sleeve is threadedly engaged in the inner cavity of the threaded sleeve, and the inner circumferential surface of the threaded sleeve also includes a third limiting surface opposite to the pressure regulating valve sleeve. The bypass flow valve also includes a gasket, which is clamped between the third limiting surface and the pressure regulating valve sleeve, and at least a portion of the gasket abuts against the end surface of the throttle valve sleeve facing away from the guide rod.

[0014] In some embodiments, the inner circumference of the pressure regulating valve core is provided with a first limiting flange, and the outer circumference of the guide rod is provided with a second limiting flange, the first limiting flange is located on the side of the second limiting flange away from the throttle valve core, and the spring clamp is arranged between the first limiting flange and the second limiting flange.

[0015] In some embodiments, each of the oil inlet, the overflow port and the oil outlet is provided with an internal thread, and the internal thread is suitable for cooperating with a plug thread so that the plug can seal any one of the oil inlet, the overflow port and the oil outlet.

[0016] In some embodiments, a first annular chamber and a second annular chamber surrounding the pressure regulating valve core are formed between the valve body and the pressure regulating valve core, the first annular chamber is connected to the overflow hole and the overflow port, and the second annular chamber is separated from the first annular chamber and connected to the oil outlet hole and the oil outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of a bypass flow valve according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1. Valve body; 11. Oil inlet; 12. Overflow port; 13. Oil outlet; 2. Pressure regulating valve sleeve; 21. Overflow hole; 22. Oil outlet hole; 3. Pressure regulating valve core; 4. Throttle valve sleeve; 5. Throttle valve core; 51. Balance chamber; 52. First channel; 53. Throttle channel; 54. Throttle hole; 55. First annular chamber; 56. Second annular chamber; 6. Threaded sleeve; 7. Linear stepper motor; 8. Guide rod; 81. Second channel; 9. Spring; 10. Connecting sleeve; 101. Gasket. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] The following combination Figure 1 A bypass type flow valve according to an embodiment of the present invention will be described.

[0022] A bypass flow valve according to an embodiment of the present invention includes a valve body 1, a pressure-regulating valve sleeve 2, a pressure-regulating valve core 3, and an elastic assembly. The valve body 1 has a first chamber and an oil inlet 11, an overflow port 12, and an oil outlet 13, all connected to the first chamber. The pressure-regulating valve sleeve 2 is fixedly mounted within the first chamber and has a second chamber. The peripheral wall of the pressure-regulating valve sleeve 2 is provided with an overflow hole 21 and an oil outlet hole 22. The overflow hole 21 connects the second chamber to the overflow port 12, while the oil outlet hole 22 connects the second chamber to the oil outlet 13. The pressure regulating valve core 3 is slidably engaged within the second chamber. The pressure regulating valve core 3 has a third chamber adapted to connect the oil inlet 11 with the overflow hole 21, and also adapted to connect the oil inlet 11 with the oil outlet 22. The pressure regulating valve core 3 has a first critical position and a second critical position. When the pressure regulating valve core 3 slides toward the first critical position, the overflow hole 21 is gradually blocked and the oil outlet 22 is gradually avoided. When the pressure regulating valve core 3 slides toward the second critical position, the overflow hole 21 is gradually avoided and the oil outlet 22 is gradually blocked. The elastic component is adapted to compress the pressure regulating valve core 3 toward the first critical position.

[0023] According to an embodiment of the bypass flow valve of the present invention, the valve body 1 is adapted to be connected to a hydraulic pump via an oil inlet 11, to a fluid tank via an overflow port 12, and to a hydraulic cylinder via an oil outlet 13. The hydraulic pump draws hydraulic oil from the fluid tank into the oil inlet 11, with some of the oil flowing into the fluid tank via the third chamber, the overflow port 21, and the overflow port 12. The remaining oil flows into the hydraulic cylinder via the third chamber, the oil outlet 22, and the oil outlet 13 to drive the load under actual working conditions. When the load decreases, the pressure differential between the oil outlet 13 and the overflow port 12 increases, thereby driving the pressure regulating valve core 3 toward the second critical position. This gradually increases the flow area at the overflow port 21 and decreases the flow area at the oil outlet 22. The changes in the two flow areas simultaneously achieve flow diversion, reducing the distance traveled by the pressure regulating valve core 3 upon reaching force equilibrium. This, in turn, reduces the elastic deformation of the elastic component, thereby effectively improving speed regulation stability.

[0024] Similarly, when the load becomes larger, the pressure difference between the oil outlet 13 and the overflow port 12 decreases, thereby driving the pressure regulating valve core 3 to move toward the first critical position, thereby causing the flow area at the overflow hole 21 to gradually decrease, and the flow area at the oil outlet hole 22 to gradually increase. The changes in the two flow areas simultaneously achieve diversion, so that the distance moved by the pressure regulating valve core 3 when reaching force balance is smaller, and the elastic deformation of the elastic component is smaller, thereby also effectively improving the speed regulation stability.

[0025] In some embodiments, as Figure 1 As shown, the bypass flow valve also includes a throttle valve sleeve 4, a throttle valve core 5, and a drive device. The throttle valve sleeve 4 fits within the second chamber and has a fourth chamber. The throttle valve core 5 slidably fits within the fourth chamber. A throttle passage 53 with an adjustable cross-sectional area is formed between the throttle valve core 5 and the throttle valve sleeve 4. The oil inlet 11 is adapted to communicate with the overflow hole 21 through the third chamber, the fourth chamber, and the throttle passage 53. The drive device is mounted on the valve body 1 and is drivingly connected to the throttle valve core 5.

[0026] The driving device drives the throttle valve core 5 to slide in the fourth chamber to change the cross-sectional area of ​​the throttle channel 53 between the throttle valve core 5 and the throttle valve sleeve 4, thereby determining the input flow of the hydraulic cylinder, that is, determining the output flow at the oil outlet 13.

[0027] Specifically, a portion of the throttle valve sleeve 4 fits within the second chamber and is spaced apart from the pressure-regulating valve core 3, allowing the pressure-regulating valve core 3 to slide within the second chamber. Simultaneously, the remaining portion of the throttle valve body 1 fits within the third chamber. At this point, when the throttle valve core 5 slides away from the pressure-regulating valve core 3, the cross-sectional area of ​​the throttle passage 53 increases, increasing the flow rate input to the hydraulic cylinder. When the throttle valve core 5 slides toward the pressure-regulating valve core 3, the cross-sectional area of ​​the throttle passage 53 decreases, decreasing the flow rate input to the hydraulic cylinder.

[0028] In some embodiments, as Figure 1 As shown, the bypass flow valve also includes a threaded sleeve 6, which is threadedly connected to the valve body 1. The inner cavity of the threaded sleeve 6 is connected to the first chamber. The throttle valve core 5 is slidably fitted in the inner cavity of the threaded sleeve 6. The throttle valve core 5 and the threaded sleeve 6 form a balance chamber 51 surrounding the throttle valve core 5. The throttle valve core 5 also has a first channel 52 connected to the fourth chamber. The peripheral wall of the throttle valve core 5 is provided with a through hole connecting the first channel 52 and the balance chamber 51. The balance chamber 51 has a first limiting surface and a second limiting surface that are opposite to each other along the axial direction of the threaded sleeve 6. The first limiting surface is formed on the threaded sleeve 6, and the second limiting surface is formed on the throttle valve core 5. The first limiting surface is located on the side of the second limiting surface away from the fourth chamber.

[0029] After the hydraulic pump sucks the hydraulic oil in the liquid tank into the oil inlet 11, it also passes through the fourth chamber, the first channel 52 and the through hole and enters the balance chamber 51. The hydraulic oil in the balance chamber 51 exerts a force on the throttle valve core 5 in the direction of the oil inlet 11, thereby effectively avoiding excessive load force on the driving device. For example, when the driving device is a linear stepping motor 7, it effectively avoids the linear stepping motor 7 from losing steps, effectively ensuring its control accuracy.

[0030] Specifically, the threaded sleeve 6 is threadedly fitted into the first chamber of the valve body 1 to achieve a fixed connection between the two.

[0031] In some embodiments, as Figure 1 As shown, the drive device includes a linear stepper motor 7. The valve body 1 has a first end face and a second end face that are opposite to each other along the axial direction of the first chamber. The linear stepper motor 7 is mounted on the first end face of the valve body 1, and the output shaft of the linear stepper motor 7 is threadedly connected to the throttle valve core 5. At this time, the first end face of the pressure regulating valve core 3 is opposite the oil inlet 11. This facilitates the pressure regulating valve core 3 to be pressed toward the second critical position by the end face of the pressure regulating valve core 3 opposite the oil inlet 11, thereby exposing the overflow hole 21.

[0032] Specifically, a connecting sleeve 10 is sandwiched between the linear stepping motor 7 and the valve body 1 , and the linear stepping motor 7 , the connecting sleeve 10 and the valve body 1 are threadedly connected via a screw member.

[0033] In some embodiments, as Figure 1 As shown, the throttle valve core 5 has a first conical surface at one end away from the drive device. The inner wall of the throttle valve sleeve 4 includes a second conical surface that matches the first conical surface. A throttle channel 53 is formed between the first and second conical surfaces. A throttle hole 54 is formed on the peripheral wall of the throttle valve sleeve 4, connecting the throttle channel 53 with the oil outlet 22.

[0034] That is, the throttle valve core 5 is a cone valve, and the first cone surface at its end can fit in contact with the second cone surface in the throttle valve sleeve 4 to close the throttle channel 53. At the same time, the linear stepping motor 7 can drive the throttle valve core 5 to slide in the direction away from the second cone surface to open and increase the throttle channel 53.

[0035] In some embodiments, as Figure 1 As shown, the elastic assembly includes a guide rod 8 and a spring 9. The guide rod 8 is slidably engaged in the third chamber and has a second passage 81 connecting the oil inlet 11 and the fourth chamber. The spring 9 is engaged in the third chamber and sleeved on the guide rod 8. The two ends of the spring 9 are respectively connected to the pressure regulating valve core 3 and the guide rod 8. At least a portion of the throttle valve core 5 is engaged in the third chamber and abuts against the guide rod 8.

[0036] Specifically, the inner circumference of the pressure regulating valve core 3 is provided with a first limiting flange, and the outer circumference of the guide rod 8 is provided with a second limiting flange. The first limiting flange is located on the side of the second limiting flange away from the throttle valve core 5, and the spring 9 is clamped between the first limiting flange and the second limiting flange.

[0037] In some embodiments, as Figure 1 As shown, the pressure regulating valve sleeve 2 is threadedly fitted in the inner cavity of the threaded sleeve 6. The inner circumferential surface of the threaded sleeve 6 also includes a third limit surface opposite to the pressure regulating valve sleeve 2. The bypass flow valve also includes a gasket 101. The gasket 101 is clamped between the third limit surface and the pressure regulating valve sleeve 2. At least a portion of the gasket 101 abuts against the end surface of the throttle valve sleeve 4 facing away from the guide rod 8.

[0038] At this time, the gasket 101 prevents the throttle valve sleeve 4 from sliding further away from the oil inlet 11 , thereby stably confining the throttle valve sleeve 4 in the second chamber of the pressure regulating valve sleeve 2 , thereby ensuring effective support for the guide rod 8 .

[0039] In some embodiments, each of the oil inlet 11 , the overflow port 12 and the oil outlet 13 is provided with an internal thread, which is suitable for cooperating with a plug thread so that the plug can seal any one of the oil inlet 11 , the overflow port 12 and the oil outlet 13 .

[0040] At this point, the overflow port 12 can be sealed by engaging an industrial threaded plug with the internal threads in the overflow port 12, thereby stopping the bypass flow valve's overflow speed regulation function. At this point, the bypass flow valve can still achieve speed regulation by changing the flow area at the oil outlet 22. Furthermore, the bypass flow valve no longer regulates the hydraulic pump's operating pressure, making it suitable for operating conditions where "a single hydraulic pump supplies fluid to multiple branches (all branches are connected in series with bypass flow valves, and the oil outlet 22 pressures of each bypass flow valve can be different)."

[0041] In some embodiments, as Figure 1As shown, a first annular chamber 55 and a second annular chamber 56 surrounding the pressure regulating valve core 3 are formed between the valve body 1 and the pressure regulating valve core 3. The first annular chamber 55 communicates with the overflow hole 21 and the overflow port 12. The second annular chamber 56 is separated from the first annular chamber 55 and communicates with the oil outlet hole 22 and the oil outlet 13. In this case, multiple overflow holes 21 and oil outlet holes 22 can be provided to increase the flow area at the corresponding positions.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0047] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A bypass flow valve, characterized in that: include: a valve body, the valve body having a first chamber, and the valve body further having an oil inlet, an overflow port, and an oil outlet communicated with the first chamber; a pressure regulating valve sleeve, the pressure regulating valve sleeve being fixedly installed in the first chamber and having a second chamber, an overflow hole and an oil outlet hole being provided on a peripheral wall of the pressure regulating valve sleeve, the overflow hole communicating with the second chamber and the overflow port, and the oil outlet hole communicating with the second chamber and the oil outlet port; a pressure regulating valve core, the pressure regulating valve core being slidably engaged in the second chamber, the pressure regulating valve core having a third chamber, the third chamber being adapted to communicate with the oil inlet and the overflow hole, and with the oil outlet hole, the pressure regulating valve core having a first critical position and a second critical position, the pressure regulating valve core gradually blocking the overflow hole and gradually avoiding the oil outlet hole when sliding toward the first critical position, and gradually avoiding the overflow hole and gradually blocking the oil outlet hole when sliding toward the second critical position; as well as An elastic component is adapted to press the pressure regulating valve core toward the first critical position.

2. The bypass flow valve according to claim 1, characterized in that: The bypass flow valve further comprises: a throttle valve sleeve and a throttle valve core, wherein the throttle valve sleeve is fitted in the second chamber and has a fourth chamber, the throttle valve core is slidably fitted in the fourth chamber, a throttle passage with an adjustable cross-sectional area is formed between the throttle valve core and the throttle valve sleeve, and the oil inlet is adapted to communicate with the overflow hole through the third chamber, the fourth chamber, and the throttle passage; and A driving device is installed on the valve body and is transmission-connected to the throttle valve core.

3. The bypass flow valve according to claim 2, characterized in that: The bypass flow valve also includes a threaded sleeve, which is threadedly connected to the valve body, and the inner cavity of the threaded sleeve is connected to the first chamber. The throttle valve core can be slidably fitted in the inner cavity of the threaded sleeve. A balance chamber surrounding the throttle valve core is formed between the throttle valve core and the threaded sleeve. The throttle valve core also has a first channel connected to the fourth chamber. The peripheral wall of the throttle valve core is provided with a through hole connecting the first channel and the balance chamber. The balance chamber has a first limiting surface and a second limiting surface opposite to each other along the axial direction of the threaded sleeve. The first limiting surface is formed on the threaded sleeve, and the second limiting surface is formed on the throttle valve core. The first limiting surface is located on the side of the second limiting surface away from the fourth chamber.

4. The bypass flow valve according to claim 3, characterized in that: The driving device includes a linear stepping motor, the valve body has a first end face and a second end face opposite to each other along the axial direction of the first chamber, the linear stepping motor is installed on the first end face of the valve body, and the output shaft of the linear stepping motor is threadedly connected to the throttle valve core.

5. The bypass flow valve according to claim 3, characterized in that: A first conical surface is provided at one end of the throttle valve core away from the driving device, the inner wall surface of the throttle valve sleeve includes a second conical surface matching the first conical surface, the throttle channel is formed between the first conical surface and the second conical surface, and a throttle hole connecting the throttle channel and the oil outlet hole is provided on the peripheral wall of the throttle valve sleeve.

6. The bypass flow valve according to claim 3, characterized in that: The elastic component includes a guide rod and a spring. The guide rod is slidably engaged in the third chamber. The guide rod has a second channel connecting the oil inlet and the fourth chamber. The spring is engaged in the third chamber and is sleeved on the guide rod. The two ends of the spring are respectively connected to the pressure regulating valve core and the guide rod. At least a portion of the throttle valve core is engaged in the third chamber and abuts against the guide rod.

7. The bypass flow valve according to claim 6, characterized in that: The pressure regulating valve sleeve is threadedly fitted in the inner cavity of the threaded sleeve, and the inner circumferential surface of the threaded sleeve also includes a third limiting surface opposite to the pressure regulating valve sleeve. The bypass flow valve also includes a gasket, which is clamped between the third limiting surface and the pressure regulating valve sleeve, and at least a portion of the gasket abuts against the end surface of the throttle valve sleeve facing away from the guide rod.

8. The bypass flow valve according to claim 6, characterized in that: The inner circumference of the pressure regulating valve core is provided with a first limiting flange, and the outer circumference of the guide rod is provided with a second limiting flange. The first limiting flange is located on the side of the second limiting flange away from the throttle valve core, and the spring clip is arranged between the first limiting flange and the second limiting flange.

9. The bypass flow valve according to claim 1, characterized in that: Each of the oil inlet, the overflow port and the oil outlet is provided with an internal thread, and the internal thread is suitable for cooperating with a plug thread so that the plug can seal any one of the oil inlet, the overflow port and the oil outlet.

10. The bypass flow valve according to claim 1, characterized in that: A first annular chamber and a second annular chamber surrounding the pressure regulating valve core are formed between the valve body and the pressure regulating valve core. The first annular chamber is connected to the overflow hole and the overflow port, and the second annular chamber is separated from the first annular chamber and is connected to the oil outlet hole and the oil outlet.

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