Pin vane pump combined with internal gear pump

Abstract

The present invention relates to a pin vane pump combined with an internal gear pump. The present invention adopts a pin vane pump and an internal gear pump for coaxial driving, a connecting cover is used to seal and connect the two pump bodies, the oil suction port of the pin vane pump and the oil suction port of the internal gear pump are communicated through the hollow inner cavity of the connecting cover, the connecting cover body is provided with a blade pressure control valve group circuit that connects the pressure port of the internal gear pump and the oil cavity at the root of the pin vane of the pin vane pump, the blade pressure control valve group circuit includes a circuit composed of a pressure reducing valve, a one-way valve, an oil control valve, and an overflow valve connected by a channel, which can realize the rapid replenishment or follow-up of the oil cavity pressure at the root of the pin vane, has a high response characteristic, does not need to wait for the transmission of the input pressure of the internal gear pump driven by the power source, and well maintains a certain pressure at the root of the pin vane, so that the oil pressure output of the vane pump is stable and the self-priming ability is not attenuated.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic components, in particular to a pin vane pump combined with an internal meshing gear pump. Background Art

[0002] A hydraulic pump is a device that converts the rotational mechanical energy of an electric motor or engine into volumetric fluid energy. It realizes the automation or semi-automation of hydraulic machinery through the control elements of the system. Vane pumps are superior to gear pumps and plunger pumps because of their low noise, long life, and small pressure pulsation. In a wide range of hydraulic equipment, its performance and life largely determine the working capacity of the entire hydraulic system.

[0003] The pin-type vane pump uses the volume change between two adjacent vanes installed in the rotor driven by the transmission shaft and the radial groove of the rotor to achieve oil suction and oil pressure. Its high pressure depends on the life of the friction pair of the vane and the stator, and the friction between the vane and the stator curved surface, oil entrapment noise, noise excited by flow pulsation and cavitation noise are the main sources of vane pump noise. The pin-type vane pump is mainly composed of a pump body, a pump cover, a stator, a rotor, vanes, front and rear distribution plates, a pin, a transmission shaft, etc. It is similar to other double-acting vane pumps in structure and working principle, but the difference is: in order to reduce the force acting on the stator at the suction chamber, a small pin is installed under the vane, and the pressure oil always passes through the bottom of the pin, pushing the vane to the stator, and the top and sides of the vane have arc grooves communicating with the bottom, so the force on the vane is basically balanced. Since the pin diameter is very small, the force acting on the stator is also very small, so the working pressure of the pump is very high. The main advantages and disadvantages of the pin-type vane pump are: high pressure and low noise, stable operating performance, good reliability, long service life, convenient manufacturing and wide application, poor self-priming performance compared to the gear pump, poor low-speed operating performance, unstable pressure and large pulsation.

[0004] Pin-type vane pumps have many advantages and are often used in various industries. However, with the development of various electrical automation control technologies, more working conditions are being driven by servo or variable frequency motors. Servo and variable frequency controlled hydraulic pumps may operate at low speeds, but when a vane pump or a multi-pump containing a vane pump is operating under servo or variable frequency motor conditions, the speed of the vane pump will operate within the low speed range or pause for a short time to maintain pressure. The centrifugal force on the blades is insufficient, or the oil chamber pressure at the root of the blade pin is unstable due to the low speed, and the pin pushing force is insufficient, making it difficult to reliably fit and seal with the inner curved surface of the stator. The pump output oil pressure is unstable, pulsating, and self-priming is poor.

[0005] At present, internal gear pumps are widely used in various industrial fields due to their simple and compact structure, small size, light weight, and wide speed range, and their structures and types are also complicated and diverse. The internal gear pump adopts the principle of internal meshing of gears. The pitch circles of the internal and external gears are close to one side, and the other side is separated by the "crescent plate" on the pump cover. The active internal gear on the main shaft drives the external gear to rotate in the same direction. At the inlet, the gears separate from each other to form a negative pressure to suck in the liquid. The gears are continuously embedded and meshed at the outlet to squeeze the liquid out. The internal gear has many advantages: 1. The pulsation of flow and pressure is much smaller than that of external gears. 2. Because the pulsation is small and sliding bearings are generally used, the noise is also small. 3. There is no oil entrapment. 4. The inlet area of ​​the oil suction chamber is large, and the oil suction is sufficient and it is not easy to cause cavitation. 5. The gear contact stress is small and the wear is small, so the life is also long. The disadvantage of the internal gear pump is that the parts are difficult to process and the displacement is smaller than that of the vane pump. Summary of the invention

[0006] The present invention is to solve the problem of large pulsation and unstable pressure output when the single / double vane pump maintains pressure within a low speed range of the vane pump under servo or variable frequency motor working conditions, and to invent a pin vane pump combined with an internal gear pump.

[0007] The present invention adopts the following technical solutions:

[0008] A pin-pole vane pump combined with an internal gear pump comprises a coaxially connected pin-pole vane pump and a gear pump, wherein the gear pump is specifically an internal gear pump, wherein the pin-pole vane pump is provided with a double output shaft, wherein the driving shaft of the internal gear pump is connected to one end of the double output shaft, and a connecting cover including a hollow inner cavity is provided between the pin-pole vane pump and the internal gear pump to seal and connect the two pump bodies, wherein the shaft connection between the pin-pole vane pump and the internal gear pump is disposed in the hollow inner cavity of the connecting cover, and the oil suction port of the pin-pole vane pump and the oil suction port of the internal gear pump are connected via the connecting cover. The hollow inner cavity is communicated, and the pin vane pump includes: a pressure side plate arranged adjacent to the connecting cover, a bimetallic side plate arranged adjacent to the pressure side plate, and a rotor provided with pin vanes. The bimetallic side plate and the rotor adjacent surface are provided with annular grooves, and the pressure side plate and the bimetallic side plate are provided with communicating channels and communicate with the annular grooves. The rotor is provided with an oil cavity at the root of the blade pin connected to the annular groove of the bimetallic side plate, and the connecting cover body is provided with a blade pressure control valve group circuit that connects the pressure port of the internal meshing gear pump and the oil cavity at the root of the blade pin of the pin vane pump. The blade pressure control valve group circuit includes a circuit composed of a pressure reducing valve, a one-way valve, and an oil control valve connected by the channel. Specifically, the pressure port of the internal meshing gear pump is connected to the pressure reducing valve, the one-way valve, and the oil control valve in sequence. After the oil control valve, it is connected to the channel of the pin vane pump body and the channel set on the pressure side plate in sequence, and finally introduced into the oil cavity at the root of the blade pin. The oil control valve includes: a cylindrical cavity, a valve core, and a spring. Specifically, a through hole is provided at one end of the cylindrical cavity, and a valve core that can slide is provided in the cylindrical cavity. A valve core is provided at one end of the valve core. A thin rod is matched with the through hole and extends out from the through hole. The valve core is provided with a damping hole. The rod chamber and the rodless chamber at both ends of the valve core in the cylindrical cavity are respectively provided with springs. The valve core is not constrained by the spring and is in the center position of the cylindrical cavity. When the valve core is in the center position, the spring of the rod chamber is in a non-pre-compressed state. When the valve core is in the center position, the spring of the rodless chamber is in a pre-compressed state. The rod chamber and the rodless chamber are connected through the damping hole provided by the valve core. The rod chamber is connected to the one-way valve, and the rodless chamber is connected to the channel connected to the pump body of the pin vane pump. The vane pressure control valve group circuit also includes an overflow valve and an overflow port. The overflow port is provided on the outer peripheral wall of the rodless chamber and connected to the rodless chamber. The overflow valve is connected to the overflow port. When the valve core slides toward the rodless chamber, the overflow port can be closed to connect to the rodless chamber. The cylindrical cavity is provided in the connecting cover body. The through hole provided at one end of the cylindrical cavity communicates with the outside of the connecting cover and exposes the thin rod of the valve core. The pressure reducing valve, relief valve and check valve are respectively inserted into the connecting cover body. The pressure oil is introduced into the pressure reducing valve inlet from the internal gear pump connecting end of the connecting cover. The return oil of the relief valve and the oil leakage of the pressure reducing valve are connected to the hollow inner cavity of the connecting cover. The pressure port orifice of the internal gear pump is provided with a thread, and the pressure port thread is screwed into the plug-in check valve. The rodless cavity volume when the valve core is centered in the cylindrical cavity is greater than the total volume of the oil cavity at the root of the blade column pin.

[0009] Compared with the prior art, the present invention can achieve the following technical effects:

[0010] The problem of large pulsation when the single / double vane pump maintains pressure in the low speed range of the vane pump under servo or variable frequency motor conditions has been solved. The internal gear pump is used to maintain pressure at low speed, which tends to be more stable. The vane pressure control valve group circuit is set to realize the position maintenance of the vane at low speed or pause state, ensuring timely pressure output response, and using the large displacement advantage of the vane pump to solve the problem that the gear pump can only supply oil to meet the requirements at high speed. The vane pump's general speed can meet the displacement oil supply requirements of the gear pump at high speed. The perfect combination of the two gives full play to their complementary advantages. After matching with the variable speed motor, the superiority is more fully demonstrated, the oil pump displacement can be selected in multiple models, and the same displacement oil pump can achieve the flow rate size Adjustment. In addition, because the shell design of this new product is relatively solid and mellow, the pump itself has a good shock absorption and noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional view of the pin vane pump combined internal gear pump of the present invention;

[0012] Figure 2 It is a schematic diagram of the blade pressure control connection principle of the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of the blade pressure control valve of the present invention;

[0014] Figure 4 It is a schematic diagram of the connection principle of the blade pressure control valve group circuit in the combined pump body structure adopted by the present invention;

[0015] Figure 5 It is a schematic diagram of the connection arrangement of the blade pressure control valve group circuit in the connection cover of the present invention;

[0016] Figure 6 yes Figure 5 Left view of;

[0017] Figure 7 It is a schematic diagram of the installation of the plug-in check valve installed at the pump port of the present invention;

[0018] Figure 8 The present invention Figure 4 Cross-sectional view of the AA pump core.

[0019] In the figure, 1-pin vane pump, 2-internal gear pump, 3-connecting cover, 4-first oil suction port, 5-first pressure port, 6-second oil suction port, 7-second pressure port, 8-drive shaft, 9-key sleeve, 10-inner end shaft, 11-hollow inner cavity, 12-inserted one-way valve, 13-pressure reducing valve, 14-one-way valve, 15-overflow valve, 16-oil control valve, 101-side plate, 102-bimetallic side plate, 103-stator, 104-rotor, 105-pin, 106-side plate oil channel, 107-oil hole, 108-ring groove, 109-inclined hole, 16-1-rodless cavity, 16-2-rod cavity, 16-3-valve core 16-3, 16-4-damping hole, 16-5-large spring, 16-6-small spring, 16-7-overflow port, 16-8 -seal, 16-9 -oil control valve inlet, 16-10 -oil control valve outlet. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 4 , Figure 8 As shown, a pin-shaped vane pump combined with an internal gear pump comprises a double pump consisting of a pin-shaped vane pump 1 and an internal gear pump 2, wherein the pin-shaped vane pump 1 is provided with a double output shaft, the outer end shaft is used to connect the power source, the inner end shaft 10 is connected to the drive shaft 8 of the internal gear pump 2 through a key sleeve 9, a connecting cover 3 containing a hollow inner cavity 11 is provided at the connecting portion of the two pump bodies, the hollow inner cavity 11 of the connecting cover 3 accommodates the key sleeve 9 connecting the two pump shafts, a sealing ring is provided at the connection between the connecting cover 3 and the two pumps, which can close the inner cavity of the connecting cover 3, the pin-shaped vane pump 1 is provided with a first oil suction port 4 and a first pressure port 5, the internal gear pump 2 is provided with a second oil suction port 6 and a second pressure port 7, the first oil suction port 4 and the second oil suction port 6 are connected through the pump body at the connecting portion of the two pumps. The opening is communicated with the inner cavity of the connecting cover 3, and the smaller oil suction port can be closed according to the working conditions, leaving only the larger oil suction port for external connection, which simplifies the assembly pipeline when the oil suction condition is good. The pin vane pump body is provided with a stator 103, a rotor 104, blades, front and rear pressure side plates, front and rear bimetallic side plates, and a pin 105, wherein the pressure side plate 101 is provided with a side plate oil channel 106, the rotor 104 is provided with an inclined hole 109 connecting the end face and the oil cavity at the root of the blade pin, the bimetallic side plate 102 is provided with an annular groove 108 adjacent to the rotor and is aligned with the inclined hole 109, the bimetallic side plate 102 is provided with an oil hole 107 adjacent to the pressure side plate 101, and the oil hole 107 connects the annular groove 108 and the side plate oil channel 106.

[0021] The second pressure port 7 of the internal gear pump 2 is connected to the connecting cover 3 through the channel provided in the gear pump body, and then connected to the pin vane pump body, the side plate oil channel 106, the oil hole 107, the annular groove 108, the inclined hole 109 in sequence through the blade pressure control valve group circuit provided in the connecting cover body, and finally introduced into the oil cavity at the root of the blade pin.

[0022] like Figure 1-Figure 3 The blade pressure control valve group circuit includes: the pressure oil is output from the second pressure port 7 and connected to the pressure reducing valve 13 and the one-way valve 14 in sequence, the outlet of the one-way valve 14 is connected to the inlet of the oil control valve 16, the outlet of the oil control valve 16 is connected to the oil chamber at the root of the blade column pin, and the oil control valve 16 is also connected to the overflow valve 15, and the return oil of the overflow valve 15 and the oil leakage of the pressure reducing valve 13 are connected to the hollow inner cavity 11 of the connection cover 3 connected to the first oil suction port 4. Figure 5 as shown; Figure 3 As shown, the oil control valve 16 is specifically as follows: a slidable valve core 16-3 is arranged in the cylindrical cavity, a thin rod is arranged at one end of the valve core 16-3, the thin rod extends from a through hole arranged at one end of the cylindrical cavity, a seal 16-8 is arranged in the through hole, a small spring 16-6 and a large spring 16-5 are arranged at both ends of the valve core 16-3 in the cylindrical cavity, wherein when the small spring 16-6 is in a pre-compression state and the large spring 16-5 is in a non-pre-compression state, the default position of the valve core 16-3 is in the center position of the cylindrical cavity, and the cylindrical cavity is closed by the valve core 16- 3 is divided into a rodless chamber 16-1 and a rod chamber 16-2, an oil control valve inlet 16-9 is arranged on the wall of the rod chamber end, an oil control valve outlet 16-10 is arranged on the wall of the rodless chamber end, an oil control valve 16 is provided with an overflow port 16-7 connected to the overflow valve 15, the overflow port 16-7 is arranged on the outer peripheral wall of the rodless chamber 16-1 and close to the wall of the rodless chamber end, a valve core 16-3 is also provided with a damping hole 16-4 connecting the rodless chamber 16-1 and the rod chamber 16-2, and the damping hole diameter can be set according to the working conditions;

[0023] Preferably, the volume of the rodless chamber 16-1 when the valve core 16-3 is centered in the cylindrical chamber is greater than the total volume of the oil chamber at the root of the blade column pin;

[0024] Preferably, the rodless chamber 16-1 spring is provided with a sunken spring positioning countersunk hole, and the valve core 16-3 can slide and compress the rodless chamber 16-1 spring and abut against the end wall of the rodless chamber, thereby closing the overflow port 16-7 channel of the overflow valve 15 through the valve core 16-3 body;

[0025] Preferably, the set pressure of the relief valve 15 is approximately equal to the cylindrical cavity pressure when the spring of the rod cavity 16-2 is at the minimum compression position.

[0026] like Figure 3-Figure 6 The cylindrical cavity of the oil control valve 16 is directly arranged in the connecting cover body, and the through hole arranged at one end of the cylindrical cavity can communicate with the outside of the connecting cover 3. When the corresponding thin rod extends from the through hole arranged at one end of the cylindrical cavity, it can be directly seen from the outside. The specific structural connection is as follows Figure 5-6, the pressure reducing valve 13, the relief valve 15, and the one-way valve 14 are respectively inserted into the connecting cover body, and the pressure oil is introduced into the inlet of the pressure reducing valve 13 from the pressure port connecting end of the internal gear pump 2 of the connecting cover 3, and the outlet of the pressure reducing valve 13 is connected to the inlet of the one-way valve 14 through the cavity provided in the connecting cover body, and the outlet of the one-way valve 14 is connected to the inlet 16-9 of the oil control valve through the cavity provided in the connecting cover body, and the outlet 16-10 of the oil control valve is connected and led out to the connecting vane pump end side of the connecting cover 3, and the overflow port 16-7 of the oil control valve 16 is connected to the inlet of the relief valve 15 through the cavity provided in the connecting cover body, and the return oil of the relief valve 15 and the oil leakage of the pressure reducing valve 13 are connected to the hollow inner cavity 11 of the connecting cover 3. According to the pressure port of the internal gear pump 2 and the suction port and pressure port position provided by the pintle vane pump 1, the setting position and direction of the pressure reducing valve 13, the relief valve 15, and the oil control valve 16 in the connecting cover 3 can be adaptively adjusted to meet the pump input / output port changes, valve adjustment and observation needs in different working conditions.

[0027] like Figure 7 The orifice of the second pressure port 7 of the internal gear pump 2 is provided with a thread, into which the insert-type one-way valve 12 can be screwed.

[0028] The pin vane pump combined with the internal gear pump can output pressure oil separately in a single connection, or the pressure oil of the internal gear pump 2 can be combined and connected with the pressure oil of the pin vane pump 1 after passing through the inserted one-way valve 12 and used as a single pump, so that the flow rate can be adjusted at will.

[0029] The working method is:

[0030] like Figure 1-4 , Figure 8, the power source outputs power to drive the internal gear pump combined with the pin vane pump to work simultaneously, the first oil suction port 4 of the pin vane pump 1 and / or the second oil suction port 6 of the internal gear pump 2 suck oil, the start of the pin vane pump is affected by the blades, the self-priming ability is poor, and the oil pressure output is difficult. In comparison, the internal gear pump 2 responds to the output pressure and flow first, and the pressure oil output from the second pressure port 7 is connected to the pressure reducing valve 13 set in the connecting cover body through the oil channel set in the internal gear pump 2. After the pressure is reduced, it passes through the one-way valve 14 and is input to the inlet of the oil control valve 16. Therefore, the oil enters the rod chamber 16-2 of the oil control valve 16 to fill the liquid, and part of the oil also enters the rodless chamber 16-1 of the oil control valve 16 through the damping hole 16-4 of the valve core 16-3. Affected by the damping throttling, a pressure difference is formed between the rod chamber 16-2 and the rodless chamber 16-1. The rod chamber 16-2 builds up pressure, pushing the valve core 16-3 to move axially to compress the small spring 16-6, making the space of the rodless chamber 16-1 smaller. At the same time, the overflow port 16-7 connected to the overflow valve 15 is blocked and closed by the valve core body. The volume ratio of the rod chamber 16-2 and the rodless chamber 16-1 is different. The oil flow and pressure input of the rod chamber 16-2 accelerate the rapid discharge of the oil from the rodless chamber 16-1 and improve the response time of the pressure establishment of the vane pump. The discharged oil is introduced into the oil chamber at the root of the vane pin through the vane pump body oil channel, the side plate oil channel 106, the oil hole 107, the annular groove 108, and the inclined hole 109 in sequence. The oil chamber is a closed oil chamber. The pressure is built up and the push pin is increased so that the vane can reliably act on the inner curved surface of the stator 103. The rotation of the rotor prompts the vane pump to output stable pressure and improve the oil absorption capacity.

[0031] When the oil pressure introduced into the oil chamber at the root of the blade pin is established, the pressure oil in the rod chamber 16-2 is continuously input into the rodless chamber 16-1 through the damping hole 16-4, and the pressure in the rodless chamber 16-1 increases accordingly. The valve core 16-3 is reset to the center by the small spring 16-6, and the overflow port 16-7 blocked and closed by the valve core body is opened and connected to the inlet of the overflow valve 15. When the oil pressure continues to increase, the valve core 16-3 continues to move toward the rod chamber 16-2, the large spring 16-5 is compressed, the volume of the rodless chamber 16-1 is expanded to store liquid and energy, and the overflow valve 15 plays a safety role. The setting of the pressure reducing valve 13 can reduce the high-pressure pressure of the internal gear pump 2 input into the root of the blade pin, causing excessive pressure on the blade, thereby preventing excessive wear of the inner curved surface of the stator 103.

[0032] At present, when a vane pump or a multi-pump including a vane pump is operating under servo or variable frequency motor conditions, the speed of the vane pump will operate within the low speed range or pause for a short time to maintain pressure. The centrifugal force exerted on the vanes is insufficient to make them reliably fit and seal with the inner curved surface of the stator 103, resulting in unstable oil pressure, large pulsation, and poor self-priming. The pin vane pump combined with an internal gear pump having the aforementioned structure can overcome the above-mentioned shortcomings, and when the oil pressure fluctuation at the root of the vane pin is introduced, the valve core 16-3 is actively moved by the elastic force of the large spring 16-5, and the oil pressure of the rodless chamber 16-1 filled with liquid and storing energy is quickly replenished or followed, with high response characteristics, and there is no need to wait for the transmission of the input pressure of the internal gear pump 2 driven by the power source, so that a certain pressure is maintained at the root of the vane pin, thereby making the oil pressure output of the vane pump stable and the self-priming ability not attenuated.

[0033] The beneficial effect of the pin vane pump combined with an internal gear pump is that the two pumps of different structural forms are set up in duplex. Without changing the original low noise characteristics, the problem of large low-speed pressure pulsation of the vane pump is reduced, and the flow rate can be output stably and timely at low speed and high pressure output.

[0034] like Figure 5-6 The beneficial effects also include that when the thin rod of the valve core 16-3 extends out of the through hole, it can be directly observed from the outside, and the oil pressure change at the root of the vane column pin of the vane pump can be judged, thereby judging the working state of the vane pump, monitoring the operation of the pump and the life reduction caused by the long-term operation of the vanes.

Claims

1. A pin vane pump combined with an internal gear pump, comprising a pin vane pump (1) and a gear pump connected coaxially, characterized in that: The gear pump is an internal gear pump (2). The pin-vane pump (1) is provided with a double output shaft. The drive shaft of the internal gear pump (2) is connected to one end of the double output shaft. A connecting cover (3) containing a hollow inner cavity (11) is provided between the pin-vane pump (1) and the internal gear pump (2) to seal and connect the two pump bodies. The shaft connection between the pin-vane pump (1) and the internal gear pump (2) is located in the hollow inner cavity (11) of the connecting cover (3). The pin-vane pump (1) is provided with a first oil suction port (4) and a first pressure port (5). The internal gear pump (2) is provided with a second oil suction port (6) and a second pressure port (7). The first oil suction port (4) and the second oil suction port (6) are in communication via the hollow inner cavity (11) of the connecting cover. The pin vane pump (1) comprises: a pressure side plate (101) arranged adjacent to a connection cover (3), a bimetallic side plate (102) arranged adjacent to the pressure side plate (101), a stator (103), and a rotor (104) provided with pin vanes; an annular groove (108) is provided on the adjacent surface of the bimetallic side plate (102) and the rotor (104); a communicating channel is provided inside the pressure side plate (101) and the bimetallic side plate (102) and communicates with the annular groove (108); the rotor (104) is provided with a blade pin root oil cavity connected to the annular groove (108) of the bimetallic side plate (102); and the connection cover (3) is provided with a blade pressure control valve group circuit connected to a second pressure port (7) and the blade pin root oil cavity of the pin vane pump (1); The vane pressure control valve group circuit comprises a circuit consisting of a pressure reducing valve (13), a one-way valve (14), and an oil control valve (16) connected by a channel. Specifically, the second pressure port (7) is connected to the pressure reducing valve (13), the one-way valve (14), and the oil control valve (16) in sequence. The oil control valve (16) is then connected to the channel of the pump body of the pin vane pump (1) and the channel provided on the pressure side plate in sequence, and finally introduced into the oil cavity at the root of the vane pin. The oil control valve (16) comprises: a cylindrical cavity, a valve core (16-3), and a spring. Specifically, a through hole is provided at one end of the cylindrical cavity, and a slidable valve core (16-3) is provided in the cylindrical cavity. A thin rod adapted to the through hole is provided at one end of the valve core (16-3) and extends out from the through hole. The valve core (16-3) is provided with a damping hole (16-4). The rod chamber (16-2) at one end of the valve core in the cylindrical cavity is provided with a large spring (16-5), and the rodless chamber (16-1) at the other end is provided with a small spring (16-6); the valve core is not constrained by the spring and is in the center position of the cylindrical cavity; when the valve core (16-3) is in the center position, the large spring (16-5) of the rod chamber (16-2) is in a non-pre-compression state; when the valve core (16-3) is in the center position, the small spring (16-6) of the rodless chamber is in a pre-compression state; the rod chamber (16-2) and the rodless chamber (16-1) are connected via a damping hole (16-4) provided on the valve core (16-3); the rod chamber (16-2) is connected to a one-way valve (14), and the rodless chamber (16-1) is connected to a channel of a pump body of a pin vane pump (1).

2. The pin vane pump combined with an internal gear pump according to claim 1, characterized in that: The blade pressure control valve group circuit also includes an overflow valve (15) and an overflow port (16-7); the overflow port (16-7) is arranged on the outer peripheral wall of the rodless chamber (16-1) and is connected to the rodless chamber (16-1); the overflow valve (15) is connected to the overflow port (16-7); and the valve core (16-3) can close the overflow port (16-7) and connect to the rodless chamber (16-1) when sliding toward the rodless chamber (16-1).

3. The pin vane pump combined with an internal gear pump according to claim 2, characterized in that: The cylindrical cavity is arranged inside the connecting cover body, and a through hole arranged at one end of the cylindrical cavity communicates with the outside of the connecting cover (3) so that the thin rod of the valve core (16-3) is exposed outside the connecting cover body.

4. The pin vane pump combined with an internal gear pump according to claim 3, characterized in that: The pressure reducing valve (13), the overflow valve (15), and the one-way valve (14) are respectively inserted into the connecting cover body, and the pressure oil is introduced into the inlet of the pressure reducing valve (13) from the connecting end of the internal gear pump (2) of the connecting cover (3), and the return oil of the overflow valve (15) and the drain oil of the pressure reducing valve (13) are connected to the hollow inner cavity (11) of the connecting cover (3).

5. The pin vane pump combined with an internal gear pump according to any one of claims 1 to 4, characterized in that: The second pressure port (7) of the internal gear pump (2) is provided with a threaded opening, and the second pressure port (7) is threadedly screwed into an insert-type one-way valve (12).

6. The pin vane pump combined with an internal gear pump according to claim 1, characterized in that: The volume of the rodless chamber (16-1) in the cylindrical chamber when the valve core (16-3) is in a centered state is greater than the total volume of the oil chamber at the root of the blade column pin.

7. The vane pin control method of the pin vane pump combined with the internal gear pump according to claim 4, characterized in that: The pressure oil output from the second pressure port (7) is connected to the pressure reducing valve (13) provided in the connecting cover body through the oil passage provided in the internal gear pump (2) to reduce the pressure, and then is input to the inlet of the oil control valve (16) after passing through the one-way valve (14). The oil enters the rod chamber (16-2) of the oil control valve (16) to be filled with liquid, and part of the oil also enters the rodless chamber (16-1) of the oil control valve (16) through the damping hole (16-4) of the valve core (16-3). Under the influence of damping throttling, the rod chamber (16-2) of the oil control valve (16) is filled with liquid. The pressure difference is formed between the chamber (16-2) and the rodless chamber (16-1). The pressure is built up in the chamber (16-2), which pushes the valve core (16-3) to move axially and compress the small spring (16-6), so that the space of the rodless chamber (16-1) becomes smaller. At the same time, the overflow port (16-7) connected to the overflow valve (15) is blocked and closed by the valve core body. The volume ratio of the chamber (16-2) and the rodless chamber (16-1) is different. The oil flow and pressure input of the chamber (16-2) accelerates the The oil in the rodless chamber (16-1) is quickly discharged, and the discharged oil is introduced into the oil chamber at the root of the vane column pin through the oil passage of the vane pump body, the oil passage of the pressure side plate (101), and the oil passage of the bimetallic side plate (102) in sequence, and the column pin is pushed out so that the vane can reliably act on the inner curved surface of the stator (103); when the oil pressure introduced into the root of the vane column pin is established, the pressure oil in the rod chamber (16-2) is continuously input into the rodless chamber (16-1) through the damping hole (16-4), and the rodless chamber (16-1) As the pressure increases, the valve core (16-3) is reset to the center by the action of the small spring (16-6), and the overflow port (16-7) blocked by the valve core body is opened and connected to the inlet of the overflow valve (15). When the oil pressure continues to increase, the valve core (16-3) continues to move in the direction of the rod chamber (16-2), the large spring (16-5) is compressed, and the volume of the rodless chamber (16-1) is expanded to store liquid and energy. When the oil chamber at the root of the blade pin decays, it is quickly replenished to maintain the stability of the blade.

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