Combined pump

Abstract

The utility model discloses a combined pump, which relates to the technical field of high-pressure common rail pumps and comprises a pump body, a liquid conveying pump arranged on the pump body, a cam shaft arranged in the pump body and two or more liquid pumping mechanisms fixed with the inside of the pump body, and the cam shaft is used for driving the liquid pumping mechanisms to move. The pump body is provided with a first liquid inlet and a second liquid inlet which are both communicated with the liquid pumping mechanism. The multiple liquid pumping mechanisms are arranged on the same pump body, different liquid media can be pumped at the same time, the integration degree is high, the structure is simple, and matching of an engine is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure common rail pump technical field especially relates to a combination pump. BACKGROUND

[0002] Methanol (chemical formula CH3OH) is the simplest alcohol compound. Methanol has good combustion performance, and compared with traditional fossil fuels, the combustion of methanol produces less hydrocarbons (HC) and nitrogen oxides (NOx), so methanol is one of the ideal alternative fuels for internal combustion engines. With the increasing global energy transformation and environmental protection needs, methanol engines have broad application prospects in future energy transformation and environmental protection.

[0003] However, methanol has certain corrosiveness. When liquid methanol is directly injected into the cylinder, it will be sprayed onto the cylinder wall of the cylinder liner, and the liquid methanol will corrode the cylinder liner and also dilute the engine oil: the reaction of methanol, water and engine oil causes engine oil emulsification.

[0004] The existing Chinese patent document with publication number CN117703602A discloses a gaseous methanol and liquid diesel dual direct injection engine HPDI system, which includes an engine, a methanol storage mechanism, a diesel storage mechanism and a heating mechanism. The methanol storage mechanism is connected to the engine to provide methanol to the engine; the diesel storage mechanism is connected to the engine to provide diesel to the engine; and the heating mechanism is arranged between the methanol storage mechanism and the transmitter. A first pressure pump is arranged between the heating mechanism and the engine, and a second pressure pump is arranged between the diesel storage mechanism and the engine.

[0005] However, the above system requires two sets of oil supply systems, has low integration level, and has the disadvantages of bulky structure and difficulty in matching with the engine. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a combination pump which can pump different liquid media and has high integration level and simple structure.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a combination pump, comprising a pump body, a liquid infusion pump arranged on the pump body, a camshaft arranged in the pump body, and two or more pump liquid mechanisms fixed in the pump body, the camshaft being used to drive the pump liquid mechanisms to move, and the pump body being provided with a first liquid inlet and a second liquid inlet which are both communicated with the pump liquid mechanisms.

[0008] The utility model discloses a technical principle as follows: through first liquid inlet and second liquid inlet can inject different liquid medium to the pump body, through setting up multiple pump liquid mechanism on the same pump body, under the action of the same camshaft, can pump different liquid medium simultaneously, and the degree of integration is high.

[0009] Further, the pump liquid mechanism comprises:

[0010] The plunger part comprises a plunger sleeve and a plunger;

[0011] The pump liquid part comprises a fixed assembly and a sealing assembly arranged in the fixed assembly;

[0012] The plunger sleeve is provided with a plunger cavity and a working cavity in communication, the plunger is slidably arranged in the plunger cavity, the fixed assembly is arranged in the working cavity, and the fixed assembly is in communication with the plunger cavity and the working cavity, and the sealing assembly is used for changing the communication state of the fixed assembly and the working cavity.

[0013] Further, a step surface is formed at the junction of the plunger cavity and the working cavity, the fixed assembly comprises an inlet valve seat, an outlet valve seat and an outlet valve tight seat arranged in sequence from bottom to top, the inlet valve seat is arranged at the step surface, and the sealing assembly comprises a first sealing ball, a first elastic member, a second sealing ball, a second elastic member and an outlet valve spring seat, the first elastic member is arranged in the outlet valve seat, the first sealing ball is arranged between the first elastic member and the inlet valve seat and abuts against the inlet valve seat, the second elastic member and the outlet valve spring seat are both arranged in the outlet valve tight seat, and the second sealing ball is arranged between the second elastic member and the outlet valve seat and abuts against the outlet valve seat.

[0014] Further,

[0015] The working cavity is provided with a first low-pressure cavity;

[0016] The side wall of the plunger sleeve is provided with a first channel in communication with the first low-pressure cavity and the outside, a liquid inlet cavity in communication with the first channel is left between the plunger sleeve and the pump body, and the first liquid inlet and the second liquid inlet are respectively in communication with the liquid inlet cavities in different pump liquid mechanisms;

[0017] The inlet valve seat is provided with a third channel, a second low-pressure cavity and a second channel in communication with the first low-pressure cavity and the second low-pressure cavity;

[0018] The outlet valve seat is provided with an intermediate cavity in communication with the second low-pressure cavity, the third channel is used for communicating the intermediate cavity and the plunger cavity, the first elastic member is fixedly installed in the intermediate cavity, the first sealing ball is arranged between the first elastic member and the second low-pressure cavity, and the first sealing ball is used for sealing the second low-pressure cavity;

[0019] The outlet valve tight seat is internally provided with an outlet cavity communicated with the intermediate cavity, the outlet valve spring seat is fixedly installed in the outlet cavity, the second elastic member is fixedly installed on the outlet valve spring seat, and the second sealing ball is arranged between the second elastic member and the intermediate cavity and is used for sealing the intermediate cavity.

[0020] Further, the plunger cavity is internally provided with a liquid return ring groove, and the plunger sleeve is internally provided with a liquid return channel communicated with the liquid return ring groove and the liquid inlet cavity.

[0021] Further, the plunger sleeve is externally provided with a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are respectively located on the upper and lower sides of the liquid inlet cavity.

[0022] Further, the pump liquid mechanism and the camshaft are provided with a roller body assembly, the roller body assembly comprises a roller seat, a roller and a pin shaft, the pin shaft penetrates through the roller seat and is fixedly installed in the roller seat, the roller is coaxially sleeved in the roller seat, and the roller is abutted against the camshaft, the roller seat is provided with a reset spring seat abutted against the plunger, the plunger sleeve is externally coaxially sleeved with a third elastic member, and the third elastic member is arranged between the plunger sleeve and the reset spring seat.

[0023] Further, the pump body is provided with a VCV valve and an overflow valve, the VCV valve is arranged between the first liquid inlet and / or the second liquid inlet and the liquid inlet cavity, and the overflow valve is communicated with the first liquid inlet and / or the second liquid inlet.

[0024] Further, the pump body is internally provided with an oil lubrication channel, the pump body is provided with an oil injection inlet communicated with the oil lubrication channel, and the oil injection inlet is provided with a one-way valve.

[0025] Further, the pump body is provided with a cam timing sensor used for detecting the rotation angle of the cam.

[0026] The beneficial effects of the utility model are as follows:

[0027] 1. By arranging multiple pump liquid mechanisms on the same pump body, different liquid media can be pumped at the same time, the degree of integration is high, the structure is simple, and the engine is easy to match.

[0028] 2. By adjusting the rigidity of the second elastic member, the pressurization requirements of different liquid media can be adapted, and the structure is simple and convenient to install. DRAWINGS

[0029] Figure 1 It is a structural schematic view of the utility model;

[0030] Figure 2 It is a side view of the utility model;

[0031] Figure 3 It is a sectional view of the utility model;

[0032] Figure 4A sectional view of the pump liquid mechanism of the present application;

[0033] Figure 5 A perspective view of the plunger sleeve of the present application;

[0034] Figure 6 A perspective view of the inlet valve seat of the present application;

[0035] Figure 7 A perspective view of the outlet valve seat of the present application;

[0036] Figure 8 A perspective view of the outlet valve seat of the present application;

[0037] In the above figures:

[0038] 1, pump body; 101, first inlet; 102, second inlet;

[0039] 2, infusion pump; 3, camshaft;

[0040] 4, pump liquid mechanism; 401, plunger sleeve; 4011, plunger cavity; 4012, working cavity; 402, plunger; 403, inlet valve seat; 404, outlet valve seat; 405, outlet valve seat; 406, first sealing ball; 407, first elastic member; 408, second sealing ball; 409, second elastic member; 410, outlet valve spring seat;

[0041] 5, roller body assembly; 501, roller seat; 502, roller; 503, pin shaft; 504, reset spring seat; 505, third elastic member;

[0042] 6, first sealing ring; 7, second sealing ring;

[0043] 8, VCV valve; 9, overflow valve; 10, oil filling inlet; 11, one-way valve; 12, cam timing sensor;

[0044] A1, first channel; A2, second channel; A3, third channel; A4, fourth channel; A5, liquid return channel;

[0045] B1, first low pressure cavity; B2, second low pressure cavity; B3, intermediate cavity; B4, outlet cavity; B5, liquid return ring groove; B6, inlet cavity. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments; the structures described in various embodiments can be freely combined without structural or principle conflicts.

[0047] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication or two element mutual action relationship. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0048] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0049] Some embodiments of the utility model will be described below in conjunction with the drawings:

[0050] As shown in Figures 1 to 8 The utility model provides a kind of combination pump, including pump body 1, setting on pump body 1 infusion pump 2, setting in pump body 1 camshaft 3 and with pump body 1 inside fixed and the number 2 or more pump liquid mechanism 4, camshaft 3 is used to drive pump liquid mechanism 4 movement, pump body 1 is opened with first liquid inlet 101 and second liquid inlet 102 that pump liquid mechanism 4 is communicated.

[0051] When the number of pump liquid mechanism 4 is 2, different liquid medium, such as methanol and oil, is injected into two pump liquid mechanism 4 respectively through first liquid inlet 101 and second liquid inlet 102, camshaft 3 is driven to rotate by engine, to drive infusion pump 2 to work, i.e. methanol can be pumped into pump liquid mechanism 4, oil can be pumped into another pump liquid mechanism 4 by additional oil pump. Under the action of camshaft 3, methanol and oil in pump liquid mechanism 4 can be pumped out.

[0052] When the number of pumping mechanisms 4 is greater than 2, such as when the number of pumping mechanisms 4 is 3, two of the pumping mechanisms 4 can pump methanol, and the other pumping mechanism 4 can pump oil. When the two pumping mechanisms 4 pump methanol, a fourth channel A4 is formed in the pump body 1 to connect the two pumping mechanisms 4. When methanol enters the first channel A1 through the first liquid inlet 101, part of the methanol enters the plunger cavity 4011 of the first pumping mechanism 4, and the other part of the methanol enters the plunger cavity 4011 of the second pumping mechanism 4 through the fourth channel A4. Oil enters the third pumping mechanism 4 through the second liquid inlet 102. Thus, different liquid media can be pumped simultaneously by the same combined pump.

[0053] Similarly, the number of pumping mechanisms 4 can be determined according to actual needs. For example, four pumping mechanisms 4 can be provided, three of which pump methanol, one of which pumps oil, or two of which pump methanol, and one of which pumps oil. The principles are the same as those described above. In addition, the combined pump can also be used to pump other different liquid media, such as methanol-diesel oil.

[0054] Different liquid media can be injected into the pump body 1 through the first liquid inlet 101 and the second liquid inlet 102. Different liquid media can be pumped simultaneously by the same camshaft 3 by providing multiple pumping mechanisms 4 on the same pump body 1. The degree of integration is high, the structure is simple, and the engine is easy to match.

[0055] Further, as shown in Figures 4-8 The pumping mechanism 4 comprises:

[0056] The plunger part comprises a plunger sleeve 401 and a plunger 402.

[0057] The pumping part comprises a fixed assembly and a sealing assembly arranged in the fixed assembly.

[0058] The plunger sleeve 401 is provided with a communication plunger cavity 4011 and a working cavity 4012. The plunger 402 is slidably arranged in the plunger cavity 4011. The fixed assembly is arranged in the working cavity 4012, and the fixed assembly is in communication with the plunger cavity 4011 and the working cavity 4012. The sealing assembly is used to change the communication state between the fixed assembly and the working cavity 4012.

[0059] Further, as shown in Figure 4 and Figure 5As shown, the junction of the plunger cavity 4011 and the working cavity 4012 forms a stepped surface, the fixing assembly includes, from bottom to top, a liquid inlet valve seat 403, a liquid outlet valve seat 404 and a liquid outlet valve tight seat 405, the liquid inlet valve seat 403 is arranged at the stepped surface, the sealing assembly includes a first sealing ball 406, a first elastic member 407, a second sealing ball 408, a second elastic member 409 and a liquid outlet valve spring seat 410, the first elastic member 407 is arranged in the liquid outlet valve seat 404, the first sealing ball 406 is arranged between the first elastic member 407 and the liquid inlet valve seat 403 and abuts against the liquid inlet valve seat 403, the second elastic member 409 and the liquid outlet valve spring seat 410 are both arranged in the liquid outlet valve tight seat 405, the second sealing ball 408 is arranged between the second elastic member 409 and the liquid outlet valve seat 404 and abuts against the liquid outlet valve seat 404.

[0060] Further, as shown in Figure 4 and Figure 5 shown,

[0061] The working cavity 4012 has a first low-pressure cavity B1 formed therein;

[0062] The plunger sleeve 401 has a first channel A1 formed in the side wall thereof and communicating with the first low-pressure cavity B1 and the outside, the plunger sleeve 401 and the pump body 1 are spaced apart to form a liquid inlet cavity B6 communicating with the first channel A1, the first liquid inlet port 101 and the second liquid inlet port 102 respectively communicate with the liquid inlet cavities B6 in different pump liquid mechanisms 4;

[0063] The liquid inlet valve seat 403 has a third channel A3, a second low-pressure cavity B2 and a second channel A2 formed therein and communicating with the first low-pressure cavity B1 and the second low-pressure cavity B2;

[0064] The liquid outlet valve seat 404 has an intermediate cavity B3 formed therein and communicating with the second low-pressure cavity B2, the third channel A3 is used to communicate the intermediate cavity B3 and the plunger cavity 4011, the first elastic member 407 is fixedly installed in the intermediate cavity B3, the first sealing ball 406 is arranged between the first elastic member 407 and the second low-pressure cavity B2, and the first sealing ball 406 is used to seal the second low-pressure cavity B2;

[0065] The liquid outlet valve tight seat 405 has a liquid outlet cavity B4 formed therein and communicating with the intermediate cavity B3, the liquid outlet valve spring seat 410 is fixedly installed in the liquid outlet cavity B4, the second elastic member 409 is fixedly installed on the liquid outlet valve spring seat 410, the second sealing ball 408 is arranged between the second elastic member 409 and the intermediate cavity B3, and the second sealing ball 408 is used to seal the intermediate cavity B3.

[0066] The first elastic member 407 and the second elastic member 409 are springs, the first sealing ball 406 and the second sealing ball 408 are made of steel and are made of methanol corrosion resistant materials (such as stainless steel 316L, surface nickel plating). The liquid inlet valve seat 403 abuts against the stepped surface and is fixed by threads or interference fit. The liquid inlet valve seat 403, the liquid outlet valve seat 404 and the liquid outlet valve tight seat 405 are sequentially arranged in the plunger sleeve 401 from bottom to top. The position where the upper side of the liquid inlet valve seat 403 contacts the first sealing ball 406 and the position where the lower side of the liquid outlet valve seat 404 contacts the second sealing ball 408 are both conical surfaces. The first elastic member 407 and the second elastic member 409 respectively have pre-tightening force on the first sealing ball 406 and the second sealing ball 408. The pre-tightening force is greater than the pressure fluctuation range of the liquid medium, which ensures that the first sealing ball 406 and the second sealing ball 408 can be strictly sealed when there is no pressure. The first sealing ball 406 and the second sealing ball 408 can move slightly (about 0.1-0.5mm) on the conical surface to respond to the change of the liquid medium pressure, but will not be separated from the liquid inlet valve seat 403 and the liquid outlet valve seat 404. By adjusting the rigidity of the second elastic member 409, the pressurization requirements of different liquid media can be adapted. The structure is simple and convenient to install.

[0067] When the plunger 402 goes down, the liquid medium enters the first low-pressure cavity B1 through the first channel A1, then enters the second low-pressure cavity B2 through the second channel A2. Under the action of the liquid medium pressure, the first sealing ball 406 can be pushed open, and the first elastic member 407 can be contracted. The liquid medium enters the intermediate cavity B3, and then enters the plunger cavity 4011 through the third channel A3.

[0068] When the plunger 402 goes up, under the action of gravity and the elastic force of the first elastic member 407, the first sealing ball 406 abuts against the liquid inlet valve seat 403, sealing the second low-pressure cavity B2. The volume of the plunger cavity 4011 decreases, and the pressure gradually increases. The liquid medium in the plunger cavity 4011 enters the intermediate cavity B3 through the third channel A3. The pressure in the intermediate cavity B3 gradually increases, until the second sealing ball 408 is pushed open, the second elastic member 409 is contracted, and the high-pressure liquid medium in the intermediate cavity B3 is sprayed out of the liquid outlet cavity B4.

[0069] Further, as shown in Figure 3 The pump liquid mechanism 4 and the camshaft 3 are provided with a roller body assembly 5. The roller body assembly 5 includes a roller seat 501, a roller 502 and a pin shaft 503. The pin shaft 503 penetrates through the roller seat 501 and is fixedly installed in the roller seat 501. The roller 502 is coaxially sleeved in the roller seat 501, and the roller 502 abuts against the camshaft 3. The roller seat 501 is provided with a reset spring seat 504 abutting against the plunger 402. A third elastic member 505 is coaxially sleeved outside the plunger sleeve 401, and the third elastic member 505 is arranged between the plunger sleeve 401 and the reset spring seat 504.

[0070] The third elastic member 505 is selected as a spring. When the camshaft 3 rotates, the roller 502 abutting against the camshaft 3 rotates synchronously, driving the plunger 402 and the roller seat 501 to move synchronously. Under the action of the third elastic member 505, the roller 502 can always abut against the camshaft 3, thereby maintaining the stability of the operation of the device.

[0071] Further, as shown in Figure 5 , the plunger cavity 4011 is provided with a liquid return ring groove B5, and the plunger sleeve 401 is provided with a liquid return channel A5 communicating the liquid return ring groove B5 and a liquid inlet cavity B6.

[0072] When the liquid medium in the plunger cavity 4011 leaks, it flows into the liquid inlet cavity B6 through the liquid return ring groove B5 and the liquid return channel A5, thereby reducing the leakage of the liquid medium.

[0073] Further, as shown in Figure 4 , the plunger sleeve 401 is provided with a first sealing ring 6 and a second sealing ring 7, and the first sealing ring 6 and the second sealing ring 7 are located on the upper and lower sides of the liquid inlet cavity B6, respectively.

[0074] Through the setting of the first sealing ring 6 and the second sealing ring 7, the liquid inlet cavity B6 can be sealed, thereby reducing the leakage of the liquid medium in the liquid inlet cavity B6.

[0075] Further, as shown in Figure 1 and Figure 2 , the pump body 1 is provided with a VCV valve 8 and an overflow valve 9. The VCV valve 8 is arranged between the first liquid inlet 101 and / or the second liquid inlet 102 and the liquid inlet cavity B6, and the overflow valve 9 communicates with the first liquid inlet 101 and / or the second liquid inlet 102.

[0076] The liquid medium entering the pump body 1 through the first liquid inlet 101 will first pass through the valve and then enter the liquid inlet cavity B6. Through the setting of the VCV valve 8, the flow of the liquid medium can be accurately adjusted, and the accurate cooperative adjustment of methanol and engine oil can be realized, avoiding the problem of crosstalk of traditional single valve control. Moreover, the VCV valve 8 is directly integrated in the pump body 1, reducing the external pipeline, thereby reducing the risk of leakage.

[0077] The overflow valve 9 is a normally closed valve. When the pressure of the liquid medium is greater than the set pressure value, the overflow valve 9 is opened, and the methanol flows into the liquid return port to return to the methanol tank through the overflow valve 9.

[0078] Further, as shown in Figure 1 , the pump body 1 is provided with an engine oil lubricating channel, and the pump body 1 is provided with an engine oil injection inlet 10 communicating with the engine oil lubricating channel. The engine oil injection inlet 10 is provided with a one-way valve 11. Through the engine oil injection inlet 10 and the engine oil lubricating channel, the camshaft 3 can be lubricated, thereby improving the service life of the camshaft 3.

[0079] Further, as Figure 1 Figure 1 A cam timing sensor 12 for detecting the cam rotation angle is provided on the pump body 1.

[0080] With the provision of the cam timing sensor 12, the cam shaft 3 position and rotation speed can be detected, a oil injection phase signal can be provided, and the valve core lubrication can be optimized.

Claims

1. A combination pump characterized by: The pump comprises a pump body (1), a liquid infusion pump (2) arranged on the pump body (1), a camshaft (3) arranged in the pump body (1), and two or more than two liquid pumping mechanisms (4) fixed in the pump body (1), the camshaft (3) is used for driving the liquid pumping mechanism (4) to move, and the pump body (1) is provided with a first liquid inlet (101) and a second liquid inlet (102) which are both communicated with the liquid pumping mechanism.

2. A combination pump according to claim 1, wherein The liquid pumping mechanism comprises: a plunger part comprising a plunger sleeve (401) and a plunger (402); a pumping part comprising a fixing assembly and a sealing assembly arranged in the fixing assembly; the plunger sleeve (401) is provided with a plunger cavity (4011) and a working cavity (4012) which are communicated, the plunger (402) is slidably arranged in the plunger cavity (4011), the fixing assembly is arranged in the working cavity (4012), and the fixing assembly is communicated with the plunger cavity (4011) and the working cavity (4012), and the sealing assembly is used for changing the communication state between the fixing assembly and the working cavity (4012).

3. A combination pump according to claim 2, wherein a step surface is formed at the junction of the plunger cavity (4011) and the working cavity (4012), the fixing assembly comprises, from bottom to top, an inlet valve seat (403), an outlet valve seat (404) and an outlet valve tight seat (405), the inlet valve seat (403) is arranged at the step surface, the sealing assembly comprises a first sealing ball (406), a first elastic member (407), a second sealing ball (408), a second elastic member (409) and an outlet valve spring seat (410), the first elastic member (407) is arranged in the outlet valve seat (404), the first sealing ball (406) is arranged between the first elastic member (407) and the inlet valve seat (403) and abuts against the inlet valve seat (403), the second elastic member (409) and the outlet valve spring seat (410) are both arranged in the outlet valve tight seat (405), and the second sealing ball (408) is arranged between the second elastic member (409) and the outlet valve seat (404) and abuts against the outlet valve seat (404).

4. The combined pump according to claim 3, wherein a working cavity (4012) is provided with a first low-pressure cavity (B1); a plunger sleeve (401) is provided with a first channel (A1) on the side wall, the first channel (A1) is communicated with the first low-pressure cavity (B1) and the outside, a liquid inlet cavity (B6) is left between the plunger sleeve (401) and the pump body (1) and communicated with the first channel (A1), and the first liquid inlet (101) and the second liquid inlet (102) are respectively communicated with the liquid inlet cavity (B6) in different liquid pumping mechanisms (4); an inlet valve seat (403) is provided with a third channel (A3), a second low-pressure cavity (B2) and a second channel (A2) which is communicated with the first low-pressure cavity (B1) and the second low-pressure cavity (B2). The outlet valve seat (404) is internally provided with an intermediate cavity (B3) communicated with the second low pressure cavity (B2), a third channel (A3) is used for communicating the intermediate cavity (B3) and the plunger cavity (4011), the first elastic member (407) is fixedly installed in the intermediate cavity (B3), the first sealing ball (406) is arranged between the first elastic member (407) and the second low pressure cavity (B2), and the first sealing ball (406) is used for sealing the second low pressure cavity (B2); The outlet valve seat (404) is internally provided with an intermediate cavity (B3) communicated with the second low pressure cavity (B2), a third channel (A3) is used for communicating the intermediate cavity (B3) and the plunger cavity (4011), the first elastic member (407) is fixedly installed in the intermediate cavity (B3), the first sealing ball (406) is arranged between the first elastic member (407) and the second low pressure cavity (B2), and the first sealing ball (406) is used for sealing the second low pressure cavity (B2); 5. A combination pump according to claim 4, wherein The plunger cavity (4011) is internally provided with a return liquid ring groove (B5), and the plunger sleeve (401) is internally provided with a return liquid channel (A5) communicated with the return liquid ring groove (B5) and the liquid inlet cavity (B6).

6. A combination pump according to claim 4 or 5, wherein The plunger sleeve (401) is externally provided with the first sealing ring (6) and the second sealing ring (7), and the first sealing ring (6) and the second sealing ring (7) are respectively located on the upper and lower sides of the liquid inlet cavity (B6).

7. A combination pump according to any one of claims 2-5, wherein The pump liquid mechanism (4) and the camshaft (3) are provided with a roller body assembly (5), the roller body assembly (5) comprises a roller seat (501), a roller (502) and a pin shaft (503), the pin shaft (503) penetrates through the roller seat (501) and is fixedly installed in the roller seat (501), the roller (502) is coaxially sleeved in the roller seat (501), and the roller (502) abuts against the camshaft (3), the roller seat (501) is provided with a reset spring seat (504) abutting against the plunger (402), the plunger sleeve (401) is externally coaxially sleeved with a third elastic member (505), and the third elastic member (505) is arranged between the plunger sleeve (401) and the reset spring seat (504).

8. A combination pump according to any one of claims 1-5, characterized in that The pump body (1) is provided with a VCV valve (8) and an overflow valve (9), the VCV valve (8) is arranged between the first liquid inlet (101) and / or the second liquid inlet (102) and the liquid inlet cavity (B6), and the overflow valve (9) is communicated with the first liquid inlet (101) and / or the second liquid inlet (102).

9. A combination pump according to any one of claims 1-5, wherein, The pump body (1) is internally provided with an oil lubrication channel, the pump body (1) is provided with an oil injection inlet (10) communicated with the oil lubrication channel, and the oil injection inlet (10) is provided with a one-way valve (11).

10. A combination pump according to any one of claims 1-5, characterized in that The pump body (1) is provided with a cam timing sensor (12) used for detecting the rotation angle of the cam. The pump body (1) is provided with a cam timing sensor (12) used for detecting the rotation angle of the cam.

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