Variable mechanism for regulating and controlling pump outlet flow

Abstract

The utility model belongs to the related technical field of variable pumps, and particularly relates to a variable mechanism for regulating and controlling pump outlet flow, which comprises a variable ring and a shaft sleeve, the shaft sleeve is arranged in an opening on one side of the variable ring, a first pipe hole is arranged at one end inside the shaft sleeve, and a second pipe hole is arranged at the other end inside the shaft sleeve. Sealing connecting assemblies are arranged outside the first pipe hole and the second pipe hole, a piston block is slidably arranged in the shaft sleeve between the first pipe hole and the second pipe hole, first connecting holes are formed in the end faces of the two sides of the piston block, and a first sliding pin and a second sliding pin are detachably connected into the two first connecting holes respectively; fixing pins are arranged at the circle centers of the two first connecting holes, and second connecting holes matched with the fixing pins are formed in the end faces of the first sliding pin and the second sliding pin outside the fixing pins. Through the arrangement of the fixing pin, the filling pad, the liquid storage tank and the like, the connection tightness between the first sliding pin and the piston block and between the second sliding pin and the piston block is improved, and the overall shock resistance and stability are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to variable pumps, and in particular relates to a variable mechanism for regulating the outlet flow of a pump. Background Art

[0002] The axial piston constant pressure variable pump can keep the pressure of the hydraulic system constant during operation, and its flow rate can be automatically adjusted according to the load size, effectively reducing the flow loss and achieving the purpose of energy saving and emission reduction. However, the traditional axial piston constant pressure variable pump has many sliding friction pairs and low power-to-weight ratio, which limits its development. For this reason, some domestic scholars continue to deepen their research, and gradually some new piston variable pumps have emerged.

[0003] For example, Zhejiang University of Technology published a paper on the design and research of a stacked two-dimensional (2D) piston constant pressure variable pump. Based on the principle of two-dimensional hydraulics, a stacked two-dimensional piston constant pressure variable pump was designed, and the structural principle verification and corresponding basic research work were carried out. This constant pressure variable pump breaks through the defects of the traditional axial piston constant pressure variable pump, reduces the sliding friction pair, balances the inertial force, is highly integrated in structure, and can connect two pump cores in series to eliminate its structural flow pulsation. Under the same displacement, its volume is smaller, the structure is more compact, and the power-to-weight ratio is greatly improved.

[0004] In the overall structure of the piston pump, the variable mechanism of the two-dimensional piston constant pressure variable pump is the key component of the piston pump to adjust the flow rate. Through the work of the variable mechanism, the overall stable work of the variable pump is completed. Therefore, continuous research is carried out on it. In the process of continuous research and experiments, certain deficiencies have been found:

[0005] 1. The slider and multiple pins inside the variable mechanism act as piston blocks, allowing them to move quickly when the forces at both ends of the sleeve change. Therefore, the whole is used to withstand impact pressure. When the variable pump works quickly and at high frequency, the forces at both ends of the sleeve switch frequently, and the tightness of the fit between the slider and the two pins will decrease, causing looseness. On the one hand, it will cause poor sliding, and on the other hand, it will affect the movement of the variable ring. The existing connection structure is not stable enough.

[0006] 2. The two ends of the sleeve are interconnected with the valve control chamber and the pump control chamber, so that the oil pressure force can enter the inside of the sleeve at the first time. Therefore, the connection stability and sealing between the two ends of the sleeve and the valve control chamber and the pump control chamber will directly affect the entry of the oil pressure force. The existing technology lacks an effective external connection structure, which leads to leakage during use, affecting the use effect. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model provides a variable mechanism for regulating the pump outlet flow rate. The utility model effectively improves the connection tightness between the first sliding pin and the second sliding pin and the piston block through the arrangement of the fixing pin, the filling pad and the liquid storage tank, so that the overall shock resistance and stability are effectively improved, and the long-term stable operation of the first sliding pin and the second sliding pin is guaranteed. The arrangement of the sealing ring and the trapezoidal protrusion effectively improves the sealing and matching effect between the shaft sleeve and the pump control chamber and the valve control chamber, reduces the occurrence of leakage, and improves the working stability of the piston pump.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a variable mechanism for regulating the flow rate of a pump outlet, comprising a variable ring and a sleeve arranged inside the variable pump, a sleeve being arranged in an opening on one side of the variable ring, a first pipe hole being arranged at one end inside the sleeve, a second pipe hole being arranged at the other end inside the sleeve, a sealing connection component being arranged outside the first pipe hole and the second pipe hole, a piston block being slidably arranged in the sleeve between the first pipe hole and the second pipe hole, a first connecting hole being arranged on both side end surfaces of the piston block, a first sliding pin and a second sliding pin being detachably connected in the two first connecting holes, the first sliding pin being slidably connected in the first pipe hole, the second sliding pin being slidably connected in the second pipe hole, a fixing pin being arranged at the center of the two first connecting holes, a second connecting hole matching with the fixing pin being arranged outside the first sliding pin and the second sliding pin end surface, and a plurality of filling pads being arranged on the outer circumferential surface of the fixing pin. The provision of the fixing pin and the plurality of filling pads effectively improves the tightness and stability of the first sliding pin or the second sliding pin when installed inside the piston block, so that the first sliding pin and the second sliding pin can slide stably for a long time.

[0009] Preferably, a sliding opening is provided on the outer circumferential surface of the sleeve below the piston block, a connecting rod is connected to the outer circumferential surface of the bottom of the piston block, and one end of the bottom of the connecting rod extends outward through the sliding opening. The setting of the connecting rod enables the variable ring to rotate smoothly.

[0010] Preferably, the sealing connection assembly includes baffle plates arranged on both sides of the outer circumferential surface of the sleeve, one side of the two baffle plates is provided with a sealing groove on the outer circumferential surface of the sleeve, a detachable sealing ring is arranged in the sealing groove, and one side of the sealing ring is provided with a plurality of guide grooves on the outer circumferential surface of the sleeve. The provision of the guide grooves and the sealing rings not only ensures the convenience of installation, but also improves the sealing effect.

[0011] Preferably, the sealing connection assembly further comprises a sealing retaining ring arranged on the outer circumferential surface of the sealing ring close to the retaining ring plate, and a trapezoidal protrusion with a hollow interior is arranged on the end surface of the sealing retaining ring away from the retaining ring plate. The trapezoidal protrusion can fully fill in each gap when under pressure, effectively improving the sealing and fastening effect.

[0012] Preferably, a sealing gasket is arranged on the outer side of the fixing pin on the inner end surface of the first connecting hole. The provision of the sealing gasket improves the fastening stability.

[0013] Preferably, a liquid storage tank is provided on the outer circumferential surface of the fixing pin. The provision of the liquid storage tank enables the staff to add fixed connection objects under practical circumstances.

[0014] Preferably, arc-shaped grooves are arranged on the end surfaces of the first sliding pin and the second sliding pin away from the piston block. The arrangement of the arc-shaped grooves can reduce the direct impact pressure of the acting force.

[0015] Preferably, a wire retaining ring is provided on one side of the sleeve on the outer circumferential surface of the variable ring.

[0016] In summary, compared with the prior art, the beneficial effects of this solution are:

[0017] (1) The utility model effectively improves the connection tightness between the first sliding pin, the second sliding pin and the piston block by means of the fixed pin, the multiple filling pads, the second connecting hole and the liquid storage tank, so that the overall shock resistance and stability are effectively improved, and the long-term stable operation of the first sliding pin and the second sliding pin is guaranteed, so that the variable mechanism can stably complete the flow control processing of the variable pump;

[0018] (2) The utility model effectively improves the sealing effect between the two ends of the shaft sleeve and the pump control chamber and the valve control chamber by configuring the sealing groove, the sealing retaining ring and the trapezoidal protrusion, thereby reducing the occurrence of leakage and improving the working stability of the piston pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is the front view of the utility model;

[0021] Figure 3 It is a top view of the utility model;

[0022] Figure 4 for Figure 2 Stereoscopic cross-sectional view at AA in the middle;

[0023] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0024] Figure 6 for Figure 4 A partial enlarged view of point C in the middle;

[0025] Figure 7 It is a three-dimensional diagram of the piston block parts;

[0026] Figure 8 for Figure 7 A partial enlarged view of point D in the middle;

[0027] Fig. 9 for Figure 4 A partial enlarged view of point E in the middle;

[0028] In the figure: variable ring 10, wire retaining ring 11, shaft sleeve 12, connecting rod 13, retaining ring plate 14, guide groove 15, sealing ring 16, sliding opening 17, first tube hole 18, second tube hole 19, first sliding pin 20, second sliding pin 21, arc groove 22, piston block 23, fixing pin 24, first connecting hole 25, second connecting hole 26, liquid storage tank 27, filling pad 28, sealing pad 29, sealing groove 30, sealing retaining ring 31, trapezoidal protrusion 32. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention.

[0030] Embodiment 1:

[0031] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 7 and attached Figure 8 As shown, a variable mechanism for regulating the flow rate at the outlet of a pump comprises a variable ring 10 and a sleeve 12 arranged inside a variable pump. The sleeve 12 is arranged in an opening on one side of the variable ring 10. A first pipe hole 18 is arranged at one end inside the sleeve 12. A second pipe hole 19 is arranged at the other end inside the sleeve 12. A sealing connection component is arranged outside the first pipe hole 18 and the second pipe hole 19. A piston block 23 is arranged between the first pipe hole 18 and the second pipe hole 19 in a sliding manner in the sleeve 12. Both end surfaces of the piston block 23 are provided with A first connecting hole 25 is provided, and the first sliding pin 20 and the second sliding pin 21 can be detachably connected in the two first connecting holes 25 respectively. The first sliding pin 20 is slidably connected in the first tube hole 18, and the second sliding pin 21 is slidably connected in the second tube hole 19. A fixing pin 24 is provided at the center of the two first connecting holes 25. The outside of the fixing pin 24 is provided with a second connecting hole 26 matching with it in the end surface of the first sliding pin 20 and the second sliding pin 21. A plurality of filling pads 28 are provided on the outer circumferential surface of the fixing pin 24.

[0032] Specifically, the variable mechanism formed by the variable ring 10 and the sleeve 12 is installed inside the stacked two-dimensional piston pump. The sleeve 12 is provided with a first tube hole 18 at one end which is interconnected with the pump control chamber inside the piston pump, and one end of the second tube hole 19 is interconnected with the valve control chamber inside the piston pump. The above-mentioned connection structures are all existing technologies and will not be elaborated in detail in this scheme. The sealing connection components arranged outside the first tube hole 18 and the second tube hole 19 are used to ensure the tightness and sealing of the connection between the end faces on both sides of the sleeve 12 and the inside of the piston pump, so that the overall movement flow of the piston pump can be stably regulated.

[0033] First connecting holes 25 are provided on both side end surfaces of the piston block 23 which is slidably arranged in the area between the first tube hole 18 and the second tube hole 19. A fixing pin 24 extending outward is provided at the center of the inner end surface of the two first connecting holes 25. In this relationship, the fixing pin 24 is set in a cylindrical shape as a whole for the convenience of processing. One end of the first sliding pin 20 and the second sliding pin 21 which slide in the first tube hole 18 and the second tube hole 19 are inserted into the first connecting hole 25. The first sliding pin 20 and the second sliding pin 21 are connected to the first connecting hole 25. A second connecting hole 26 which cooperates with the fixing pin 24 is provided on the end. When the first sliding pin 20 or the second sliding pin 21 inserts one end into the first connecting hole 25, in addition to the outer circumferential surface of the first sliding pin 20 or the second sliding pin 21 being able to obtain contact friction, the second connecting hole 26 on the inner circumferential surface of the first sliding pin 20 or the second sliding pin 21 is provided. The second connecting hole 26 can also contact the outer cylindrical surface of the fixed pin 24 with friction, so that the overall contact friction and tightness are improved, so that when the piston block 23 slides under the external pressure of the first sliding pin 20 or the second sliding pin 21, the overall sliding stability is guaranteed. In this process relationship, when the force on the side of the first tube hole 18 is greater than the force on the side of the second tube hole 19, the first sliding pin 20, the second sliding pin 21 and the piston block 23 will be pushed to one side under the influence of the force, and vice versa, until the pressure on both sides of the first tube hole 18 and the second tube hole 19 is balanced. When the variable pump works at a high frequency, the force changes faster, and the sliding frequency of the piston block 23 will become higher. In the above scheme, the working steps and working principles of the first sliding pin 20, the second sliding pin 21 and the piston block 23 to adjust the flow under the action of external force are all existing technologies, and this scheme will not be elaborated in detail.

[0034] The outer circumferential surface of the fixing pin 24 is provided with a plurality of key grooves for installing the filling pads 28. The filling pads 28 are made of an elastic and non-slip rubber material, which is a prior art and will not be elaborated in detail in this scheme. The outer end surface of the filling pad 28 is provided with a plurality of non-slip stripes, which are embedded in the plurality of key grooves on the outer circumferential surface of the fixing pin 24. The overall outer end surface protrudes from the outer circumferential surface of the fixing pin 24. When the fixing pin 24 is inserted into the second connecting hole 26, the plurality of filling pads 28 will be fully squeezed and deformed. The deformed filling pads 28 will generate a certain deformation pressure between the second connecting hole 26 and the fixing pin 24, thereby increasing the fastening pressure between the fixing pin 24 and the second connecting hole 26, so that the piston block 23 and the first sliding pin 20 and the second sliding pin 21 can also ensure good stability and safety under high-pressure, rapid and multiple sliding conditions.

[0035] In the above scheme, the size or length of the first connecting hole 25 and the fixing pin 24 is adjusted according to the actual size or situation of the first sliding pin 20 or the second sliding pin 21. This scheme does not impose too many restrictions, so the first connecting holes 25 or the fixing pins 24 on both sides of the piston block 23 are allowed to have size differences.

[0036] Further, as attached Figure 1 , Attachment Figure 4 and attached Figure 7 As shown, a sliding opening 17 is provided on the outer circumferential surface of the middle part of the sleeve 12 below the piston block 23, and a connecting rod 13 is connected to the outer circumferential surface of the bottom of the piston block 23, and one end of the bottom of the connecting rod 13 extends to the outside through the sliding opening 17.

[0037] Specifically, the variable ring 10 is provided with a plurality of openings on one side of the shaft sleeve 12, so that one end of the connecting rod 13 can be connected to the outer cylindrical surface of the piston block 23, and the other end can be in the opening at the bottom of the variable ring 10. When the piston block 23 slides to both sides under the influence of the forces on both sides of the first tube hole 18 and the second tube hole 19, it can drive the sliding opening 17 to move the variable ring 10, so that the variable ring 10 can rotate, thereby completing the function of adjusting the supply. In this relationship, the principle of the variable ring 10 to adjust the flow is the existing technology, and this scheme will not elaborate on it in detail.

[0038] Further, as attached Figure 1 As shown, a wire retaining ring 11 is provided on one side of the sleeve 12 on the outer circumferential surface of the variable ring 10 .

[0039] Specifically, the wire retaining ring 11 is arranged on the outer circumferential surface of the variable ring 10 on one side of the shaft sleeve 12 to ensure stable rotation of the variable ring 10 .

[0040] Further, as attached Figure 1 and attached Fig. 9As shown, the sealing connection assembly includes retaining ring plates 14 arranged on both sides of the outer circumferential surface of the sleeve 12, one side of the two retaining ring plates 14 is provided with a sealing groove 30 on the outer circumferential surface of the sleeve 12, a removable sealing ring 16 is arranged in the sealing groove 30, and one side of the sealing ring 16 is provided with multiple guide grooves 15 on the outer circumferential surface of the sleeve 12.

[0041] Specifically, when the first tube hole 18 or the second tube hole 19 at both ends of the sleeve 12 needs to be connected to the valve control chamber or the pump control chamber inside the pump body, the staff can place the sealing ring 16 inside the sealing groove 30 in advance, and then insert the two ends of the sleeve 12 into the liquid supply holes of the valve control chamber or the pump control chamber. During insertion, the multiple guide grooves 15 on the outer circular surface of the sleeve 12 can play a certain guiding role, making the installation smoother. The sealing ring 16 inside the sealing groove 30 will be in full contact with the inside of the liquid supply hole during the insertion process, thereby ensuring the sealing performance, until the end face of the retaining ring plate 14 abuts against the outer wall of the valve control chamber or the pump control chamber, and then stops moving. At this time, the sleeve 12 completes the sealing connection process.

[0042] Further, as attached Fig. 9 As shown, the sealing connection assembly also includes a sealing retaining ring 31 arranged on the outer circumferential surface of the sealing ring 16 close to the retaining ring plate 14 , and a trapezoidal protrusion 32 with a hollow interior is arranged on the end surface of the sealing retaining ring 31 away from the retaining ring plate 14 .

[0043] Specifically, one end face of the sealing retaining ring 31 arranged on the outer circumferential surface of the sealing ring 16 close to the retaining ring plate 14 abuts against the side wall of the retaining ring plate 14, and the trapezoidal protrusion 32 arranged on the other end of the sealing retaining ring 31 is hollow inside, and the overall cross-section is in the shape of an inverted trapezoid. The end away from the retaining ring plate 14 is wider, which can provide a larger contact area, and the end close to the retaining ring plate 14 is narrower, which is convenient for pressure deformation. When the retaining ring plate 14 is pressed on the outer wall of the valve control chamber or the pump control chamber, the staff can apply pressure to the outer wall of the valve control chamber or the pump control chamber. At this time, the outer end face of the sealing retaining ring 31 will first provide basic sealing treatment, and the trapezoidal protrusion 32 will produce elastic deformation in this process. The deformed trapezoidal protrusion 32 will fill in the multiple gaps at the sealing position, so that a secondary seal can be formed on one side of the sealing groove 30. In this relationship, when the inverted trapezoidal protrusion 32 is deformed, due to the presence of a triangular structure inside, it can reduce the situation of tilting or arbitrary bending, thereby ensuring the formation of a sufficient seal.

[0044] Further, as attached Figure 5 As shown, a sealing gasket 29 is arranged on the outer side of the fixing pin 24 on the inner end surface of the first connecting hole 25 .

[0045] Specifically, an annular groove for installing the sealing gasket 29 is provided on the inner end surface of the first connecting hole 25, and the sealing gasket 29 is integrally embedded in the annular groove. The sealing gasket 29 is made of anti-slip rubber material. When one end of the first tube hole 18 or the second tube hole 19 is pressed into the first connecting hole 25, one side end surface of the first tube hole 18 or the second tube hole 19 will contact and squeeze with the sealing gasket 29, thereby providing a certain friction force on the outer end surface of the first tube hole 18 or the second tube hole 19 to improve stability.

[0046] Embodiment 2:

[0047] As attached Figure 6 As shown, a variable mechanism for regulating the pump outlet flow rate, a liquid storage tank 27 is provided on the outer circumferential surface of the fixed pin 24.

[0048] As a further embodiment, the liquid storage tank 27 is in the shape of an inner arc ring as a whole, and is arranged on the outer circular surface of the end of the fixing pin 24 away from the first connecting hole 25. Before the fixing pin 24 is inserted into the second connecting hole 26, the staff can fill the liquid storage tank 27 with anti-slip material. At this time, the anti-slip material can be set according to the actual environment at that time, which is optional. By filling different anti-slip materials, a secondary reinforcement treatment can be formed on the outside of the fixing pin 24.

[0049] Embodiment three:

[0050] As attached Figure 4 As shown, a variable mechanism for regulating the flow rate at the pump outlet is provided with arc grooves 22 on the end surfaces of the first sliding pin 20 and the second sliding pin 21 away from the piston block 23.

[0051] Specifically, the arc-shaped groove 22 is arranged on the end surface of the first sliding pin 20 and the second sliding pin 21 away from the piston block 23, and the whole is in the shape of an inner arc surface. When the pressure outside the first tube hole 18 or the second tube hole 19 enters the first tube hole 18 or the second tube hole 19 to push the first sliding pin 20 or the second sliding pin 21, the arc-shaped arc-shaped groove 22 can play a certain role in guiding and relieving pressure at the moment when the force enters quickly, compared with the traditional flat end, thereby reducing the direct impact and ensuring a certain sliding stability.

[0052] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0053] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0054] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A variable mechanism for regulating the flow rate at a pump outlet, comprising a variable ring (10) and a sleeve (12) arranged inside a variable pump, characterized in that: A shaft sleeve (12) is arranged in an opening on one side of the variable ring (10), a first tube hole (18) is arranged at one end inside the shaft sleeve (12), a second tube hole (19) is arranged at the other end inside the shaft sleeve (12), a sealing connection component is arranged outside the first tube hole (18) and the second tube hole (19), a piston block (23) is slidably arranged in the shaft sleeve (12) between the first tube hole (18) and the second tube hole (19), and first connecting holes (25) are arranged on both side end surfaces of the piston block (23), and the two first connecting holes (25) are arranged on the shaft sleeve (12). A first sliding pin (20) and a second sliding pin (21) are detachably connected in the first tube hole (18), and the second sliding pin (21) is slidably connected in the second tube hole (19). A fixing pin (24) is arranged at the center of each of the two first connecting holes (25). Second connecting holes (26) cooperating with the fixing pin (24) are arranged on the end surfaces of the first sliding pin (20) and the second sliding pin (21). A plurality of filling pads (28) are arranged on the outer circumferential surface of the fixing pin (24).

2. A variable mechanism for regulating pump outlet flow according to claim 1, characterized in that: A sliding opening (17) is provided on the outer circumferential surface of the shaft sleeve (12) below the piston block (23), and a connecting rod (13) is connected to the outer circumferential surface of the bottom of the piston block (23), and one end of the bottom of the connecting rod (13) passes through the sliding opening (17) and extends to the outside.

3. A variable mechanism for regulating pump outlet flow according to claim 1, characterized in that: The sealing connection assembly comprises retaining ring plates (14) arranged on both sides of the outer circumferential surface of the shaft sleeve (12), one side of the two retaining ring plates (14) being provided with a sealing groove (30) on the outer circumferential surface of the shaft sleeve (12), a detachable sealing ring (16) being arranged in the sealing groove (30), and one side of the sealing ring (16) being provided with a plurality of guide grooves (15) on the outer circumferential surface of the shaft sleeve (12).

4. A variable mechanism for regulating pump outlet flow according to claim 3, characterized in that: The sealing connection assembly also includes a sealing retaining ring (31) arranged on the outer circumferential surface of the sealing ring (16) close to the retaining ring plate (14), and a trapezoidal protrusion (32) with a hollow interior is arranged on the end surface of the sealing retaining ring (31) away from the retaining ring plate (14).

5. A variable mechanism for regulating pump outlet flow according to claim 1, characterized in that: A sealing gasket (29) is arranged on the outer side of the fixing pin (24) on the inner end surface of the first connecting hole (25).

6. A variable mechanism for regulating pump outlet flow according to claim 5, characterized in that: A liquid storage tank (27) is provided on the outer circumferential surface of the fixing pin (24).

7. A variable mechanism for regulating pump outlet flow according to claim 1, characterized in that: Arc-shaped grooves (22) are provided on the end surfaces of the first sliding pin (20) and the second sliding pin (21) away from the piston block (23).

8. A variable mechanism for regulating pump outlet flow according to claim 2, characterized in that: A steel wire retaining ring (11) is provided on one side of the shaft sleeve (12) on the outer circumferential surface of the variable ring (10).

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