Oil pumping system structure for methanol pump

Abstract

The utility model relates to an oil pumping system structure for a methanol pump. The water pump comprises a pump body, the plunger sleeve is arranged in the pump body and is provided with a low-pressure fuel cavity; the plunger is movably connected to the interior of a cavity of the plunger sleeve, the oil inlet valve is installed on the plunger sleeve, a plunger cavity capable of being communicated with the low-pressure fuel cavity is formed between the plunger and the oil inlet valve, and the oil inlet valve is provided with a high-pressure oil outlet hole; the oil outlet valve is installed on the plunger sleeve, and the oil outlet valve is provided with a high-pressure fuel cavity capable of being communicated with the high-pressure oil outlet hole; when the plunger moves to a first position, the oil inlet valve can be opened and the oil outlet valve can be closed at the same time, so that the low-pressure fuel cavity communicates with the plunger cavity; and when the plunger moves to a second position, the oil inlet valve can be closed and the oil outlet valve can be opened at the same time, so that the high-pressure fuel cavity is communicated with the high-pressure oil outlet hole. The sealing ring has the advantages of low processing difficulty, chemical resistance, long sealing life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a pump oil system structure for a methanol pump. Background Art

[0002] The current high-pressure fuel supply pump is mainly used to repeatedly pressurize low-pressure diesel and supply it to the high-pressure rail and injector to meet the working needs of the engine. However, due to the formic acid corrosiveness and low viscosity of methanol solution, the existing pump oil system structure has problems such as easy corrosion, increased leakage and reduced efficiency, so it is not suitable for methanol fuel. Summary of the invention

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problems in the prior art that the oil pump system structure is prone to corrosion, has increased leakage, reduced efficiency, and is not suitable for methanol fuel.

[0004] In order to solve the above technical problems, the utility model provides a pump oil system structure for a methanol pump, comprising:

[0005] Pump body;

[0006] A plunger sleeve, disposed in the pump body and provided with a low-pressure fuel chamber;

[0007] A plunger is movably connected in the cavity of the plunger sleeve,

[0008] An oil inlet valve is installed on the plunger sleeve, a plunger cavity which can communicate with the low-pressure fuel cavity is formed between the plunger and the oil inlet valve, and the oil inlet valve is provided with a high-pressure oil outlet hole;

[0009] An oil outlet valve is installed on the plunger sleeve, and the oil outlet valve is provided with a high-pressure fuel cavity capable of communicating with the high-pressure oil outlet hole;

[0010] When the plunger moves to the first position, the oil inlet valve can be opened and the oil outlet valve can be closed at the same time, so that the low-pressure fuel chamber and the plunger chamber are connected;

[0011] When the plunger moves to the second position, the oil inlet valve can be closed and the oil outlet valve can be opened at the same time, so that the high-pressure fuel chamber and the high-pressure oil outlet hole are connected.

[0012] In one embodiment of the utility model, the oil inlet valve comprises:

[0013] An oil inlet valve seat is arranged in the cavity of the plunger sleeve, the oil inlet valve seat includes an oil inlet valve middle cavity, the high-pressure oil outlet hole runs through the upper and lower ends of the oil inlet valve seat, and the plunger cavity is formed between the plunger and the oil inlet valve seat;

[0014] An oil inlet valve core is movably connected to the oil inlet valve middle cavity and can be sealed with the oil inlet valve middle cavity;

[0015] The oil inlet valve spring is arranged in the cavity of the plunger sleeve, and the two ends of the oil inlet valve spring are respectively against the oil inlet valve core and the inner side wall of the cavity of the plunger sleeve.

[0016] In one embodiment of the utility model, an oil inlet valve cavity, at least one low-pressure oil inlet hole and at least one high-pressure oil outlet hole are provided on the oil inlet valve seat; one end of the oil inlet valve cavity can be connected to the plunger cavity, and the other end is connected to the low-pressure fuel cavity through the low-pressure oil inlet hole, and the oil inlet valve core extends into the oil inlet valve cavity; one end of the high-pressure oil outlet hole is connected to the plunger cavity.

[0017] In an implementation manner of the utility model, a valve seat sealing step is provided in the plunger cavity, and the oil inlet valve seat abuts against the valve seat sealing step.

[0018] In an implementation manner of the utility model, the oil inlet valve seat and the oil inlet valve core are sealed by a conical surface to form the oil inlet valve cavity.

[0019] In one embodiment of the utility model, the oil outlet valve comprises:

[0020] An oil outlet valve connector, connected to the end of the plunger sleeve, wherein a volume reducing body is arranged in the oil outlet valve connector;

[0021] An oil outlet valve seat, connected to the oil outlet valve connector, the oil outlet valve seat;

[0022] An oil outlet valve ball, matched with the oil outlet valve seat and limited by the volume reduction body;

[0023] An oil outlet valve spring is respectively against the volume reducing body and the oil outlet valve ball;

[0024] Wherein, the high-pressure fuel chamber is formed between the oil outlet valve seat and the volume reducing body.

[0025] In an embodiment of the utility model, the oil outlet valve connector and the plunger sleeve are connected via threads and a first sealing ring made of fluorosilicone rubber is provided between the two.

[0026] In an implementation manner of the utility model, the oil outlet valve seat is provided with a conical surface which cooperates with the oil outlet valve ball seal.

[0027] In one embodiment of the utility model, the plunger sleeves are respectively provided with plunger sleeve oil return holes connected to the low-pressure fuel chamber, a plunger oil seal is provided between the plunger sleeve and the plunger, the outer surface of the plunger oil seal abuts against the inner wall of the plunger sleeve, and the methanol leaked downward through the plunger can flow back to the low-pressure fuel chamber through the plunger sleeve oil return hole.

[0028] In one embodiment of the utility model, a second sealing ring and a fourth sealing ring made of fluorosilicone rubber are provided between the plunger sleeve and the pump body, and the plunger oil seal is a third sealing ring made of fluorosilicone rubber.

[0029] The above technical solution of the utility model has the following advantages compared with the prior art:

[0030] The utility model discloses an oil pump system structure for a methanol pump, which ensures accurate opening and closing of an oil inlet valve and an oil outlet valve, thereby making the transportation of methanol more efficient and reducing energy loss. It also provides a reasonable high-pressure oil outlet hole to control the transportation and distribution of high-pressure methanol, thereby ensuring the oil pump efficiency, improving the sealing performance and controlling leakage, thereby reducing methanol leakage that may cause harm to the environment and operators. The setting of the oil return structure effectively prevents methanol and lubricating oil from mixing with each other, thereby further reducing the risk of fuel leakage.

[0031] The pump oil system returns oil directly to the low-pressure fuel chamber by optimizing the oil return hole of the plunger sleeve. There is no need to process the oil return hole on the pump body, which reduces the processing difficulty and the risk of cutting the sealing ring during the assembly process.

[0032] The pump oil system has optimized the sealing structure, effectively reducing methanol leakage and significantly increasing product safety. By selecting methanol-resistant materials such as fluorosilicone rubber, the chemical resistance and sealing life of sealing parts are improved.

[0033] The pump oil system positioning design, such as the valve seat sealing step, simplifies the assembly process, improves assembly efficiency, and ensures the accurate positional relationship between components. The corrosion resistance and enhanced sealing extend the service life of the pump oil system structure, further saving long-term maintenance and replacement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0035] Figure 1 The utility model is a schematic diagram of the composition of the pump oil system structure for the methanol pump.

[0036] Figure 2 The utility model is a schematic diagram of the assembly of the pump oil system structure for the methanol pump.

[0037] Figure 3 It is a schematic diagram of the valve seat sealing step of the utility model.

[0038] Figure 4 Schematic diagram of the remaining oil return structure.

[0039] Description of the Figures in the Specification:

[0040] 1. Pump body; 2. Plunger sleeve; 3. Plunger; 4. Oil inlet valve spring; 5. Oil inlet valve core; 6. Oil inlet valve seat; 7. Oil outlet valve seat; 8. Oil outlet valve ball; 9. Oil outlet valve spring; 10. Volume reducer; 11. Oil outlet valve joint; 12. First sealing ring; 13. Second sealing ring; 14. Third sealing ring; 15. Fourth sealing ring; 16. Plunger oil seal; 6a. Oil inlet valve middle cavity; 101. Low-pressure fuel cavity; 102. Pump body oil return hole; 201. Plunger sleeve oil return hole; 202. Plunger cavity; 601. Low-pressure oil inlet hole; 602. Oil inlet valve cavity; 603. High-pressure oil outlet hole; 1101. High-pressure fuel cavity; 2011. Valve seat sealing step. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0042] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0043] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0045] Reference Figure 1 , Figure 2 As shown, the utility model is a pump oil system structure for a methanol pump, comprising:

[0046] Pump body 1;

[0047] The plunger sleeve 2 is arranged in the pump body 1 and is provided with a low-pressure fuel chamber 101;

[0048] The plunger 3 is movably connected in the cavity of the plunger sleeve 2.

[0049] An oil inlet valve is installed on the plunger sleeve 2, a plunger cavity 202 which can communicate with the low-pressure fuel cavity 101 is formed between the plunger 3 and the oil inlet valve, and the oil inlet valve is provided with a high-pressure oil outlet hole 603;

[0050] An oil outlet valve, installed on the plunger sleeve 2, the oil outlet valve is provided with a high-pressure fuel chamber 1101 capable of communicating with the high-pressure oil outlet hole 603;

[0051] When the plunger 3 moves to the first position, the oil inlet valve can be opened and the oil outlet valve can be closed at the same time, so that the low-pressure fuel chamber 101 and the plunger chamber 202 are connected;

[0052] When the plunger 3 moves to the second position, the oil inlet valve can be closed and the oil outlet valve can be opened at the same time, so that the high-pressure fuel chamber 1101 and the high-pressure oil outlet hole 603 are connected.

[0053] In some embodiments, the oil inlet valve includes an oil inlet valve seat 6, an oil inlet valve core 5 and an oil inlet valve spring 4; wherein the oil inlet valve seat 6 is arranged in the cavity of the plunger sleeve 2, the oil inlet valve seat 6 includes an oil inlet valve middle cavity 6a, the high-pressure oil outlet hole 603 runs through the upper and lower ends of the oil inlet valve seat 6, and the plunger cavity 202 is formed between the plunger 3 and the oil inlet valve seat 6; the oil inlet valve core 5 is movably connected to the oil inlet valve middle cavity 6a and can be sealed with the oil inlet valve middle cavity 6a; wherein the guide section of the oil inlet valve core 5 is provided with a flat position structure to ensure that there is no pressure difference between the upper and lower parts; the oil inlet valve spring 4 is arranged in the cavity of the plunger sleeve 2, and the two ends of the oil inlet valve spring 4 are respectively against the inner side walls of the cavity of the oil inlet valve core 5 and the plunger sleeve 2. When the oil inlet valve is opened, the elastic force of the oil inlet valve spring 4 increases; when the oil inlet valve is closed, the elastic force of the oil inlet valve spring 4 decreases.

[0054] The low-pressure oil inlet hole 601 is connected to the low-pressure oil circuit to realize the continuous supply of low-pressure oil. When the oil inlet valve core 5 moves downward and separates from the oil inlet valve seat 6, the oil inlet valve cavity 602 is connected with the plunger cavity 202, the oil inlet valve is opened, and the low-pressure fuel enters the plunger cavity 202 from the low-pressure oil inlet hole 601 and the oil inlet valve cavity 602. When the oil inlet valve core 5 moves upward and abuts against the oil inlet valve seat 6, the oil inlet valve cavity 602 is disconnected from the plunger cavity 202, and the oil inlet valve is closed.

[0055] In some embodiments, the oil inlet valve seat 6 is provided with an oil inlet valve cavity 602, at least one low-pressure oil inlet hole 601 and at least one high-pressure oil outlet hole 603; one end of the oil inlet valve cavity 602 can be connected to the plunger cavity 202, and the other end is connected to the low-pressure fuel cavity 101 through the low-pressure oil inlet hole 601, and the oil inlet valve core 5 extends into the oil inlet valve cavity 602; one end of the high-pressure oil outlet hole 603 is connected to the plunger cavity 202.

[0056] In some embodiments, reference Figure 3 As shown, in order to facilitate the positioning of the oil inlet valve seat 6 and reduce the difficulty of assembly, a valve seat sealing step 2011 is provided in the plunger cavity 202 , and the oil inlet valve seat 6 abuts against the valve seat sealing step 2011 to limit the position of the oil inlet valve seat 6 .

[0057] During assembly, the oil inlet valve spring 4, the oil inlet valve core 5, the oil inlet valve seat 6 and the oil outlet valve seat 7 are placed into the plunger cavity 202 in sequence, so that the oil inlet valve seat 6 abuts against the valve seat sealing step 2011, so that the position of the oil outlet valve seat 7 is positioned according to the positioning of the oil inlet valve seat 6. When the plunger sleeve 2 and the oil outlet valve connector 11 are connected, the oil inlet valve seat 6 and the oil outlet valve seat 7 are fixed in the plunger cavity 202, thereby improving the assembly efficiency while ensuring the positional relationship between the various components.

[0058] In some embodiments, the oil inlet valve seat 6 and the oil inlet valve core 5 are sealed by a conical surface to form the oil inlet valve cavity 602 .

[0059] In some embodiments, the oil outlet valve includes an oil outlet valve connector 11, an oil outlet valve seat 7, an oil outlet valve ball 8 and an oil outlet valve spring 9; the oil outlet valve connector 11 is connected to the end of the plunger sleeve 2, and a volume reduction body 10 is arranged in the oil outlet valve connector 11; the oil outlet valve seat 7 is connected to the oil outlet valve connector 11 and the oil outlet valve seat 7; the oil outlet valve ball 8 cooperates with the oil outlet valve seat 7 and is limited by the volume reduction body 10; the oil outlet valve spring 9 is respectively against the volume reduction body 10 and the oil outlet valve ball 8; wherein the high-pressure fuel chamber 1101 is formed between the oil outlet valve seat 7 and the volume reduction body 10.

[0060] During the specific installation, the plunger 3, the oil inlet valve and the oil outlet valve are sequentially arranged along the plunger cavity 202 from bottom to top; the plunger 3 and the plunger cavity 202 are clearance-matched, and one end of the plunger 3 is connected to the driving component in the inner cavity of the alcohol supply pump to realize the reciprocating motion of the plunger 3. It can be understood that the oil inlet valve and the oil outlet valve have two states of opening and closing. When the plunger 3 moves downward, the oil inlet valve is opened and the oil outlet valve is closed, and methanol enters the plunger cavity 202. When the plunger 3 moves upward, the oil inlet valve is closed, and the methanol pressure in the plunger cavity 202 increases. When the plunger 3 continues to move upward until the methanol pressure is higher than the high-pressure fuel cavity 1101, the oil outlet valve is opened, and the fuel enters the high-pressure fuel cavity 1101; by using the cooperation of the plunger 3, the oil inlet valve and the oil outlet valve, the fuel is pressurized and transported to the high-pressure fuel cavity 1101, and then supplied to the subsequent components.

[0061] In some embodiments, the oil outlet valve seat 7 is provided with a conical surface which seals with the oil outlet valve ball 8 .

[0062] The oil outlet valve ball 8 extends into the high-pressure fuel chamber 1101; when the surface of the oil outlet valve ball 8 fits the sealing cone, the oil outlet valve is closed, and when the oil outlet valve ball 8 separates from the sealing cone, the oil outlet valve is opened; through the cooperation between the oil outlet valve ball 8 and the sealing cone, the opening and closing of the oil outlet valve is realized, and then the connection and disconnection between the plunger chamber 202 and the high-pressure fuel chamber 1101 are controlled.

[0063] The oil outlet valve spring 9 and the spring seat can limit the movement stroke of the oil outlet valve ball 8, ensuring the accuracy of the opening and closing of the oil outlet valve seat 7; when the oil outlet valve is closed, the elastic force of the oil outlet valve spring 9 decreases, and when the oil outlet valve is opened, the elastic force of the oil outlet valve spring 9 increases; the pressurized fuel pressure overcomes the elastic force of the oil outlet valve spring 9, and the oil outlet valve ball 8 is pushed open to separate from the sealing cone surface, and the oil outlet valve opens, and the high-pressure fuel in the plunger cavity 202 enters the high-pressure fuel cavity 1101 through the high-pressure oil outlet hole 603 and the oil outlet valve.

[0064] In order to adapt to the corrosive characteristics of methanol fuel, the inlet valve spring 4, the outlet valve spring 9 and the outlet valve ball 8 are made of stainless steel, and the parts that contact methanol, such as the pump body 1, the plunger sleeve 2, the plunger 3, the inlet valve core 5, the inlet valve seat 6, the outlet valve seat 7, the volume reducer 10, and the outlet valve joint 11, have protective coating treatments on the surface, such as chrome plating, nickel plating, etc., to increase corrosion resistance.

[0065] In some embodiments, reference Figure 1 As shown, the plunger sleeve 2 is respectively provided with a plunger sleeve oil return hole 201 connected to the low-pressure fuel chamber 101, and a plunger oil seal 16 is provided between the plunger sleeve 2 and the plunger 3. The outer surface of the plunger oil seal 16 abuts against the inner wall of the plunger sleeve 2. Methanol leaking downward through the plunger 3 can flow back to the low-pressure fuel chamber 101 through the plunger sleeve oil return hole 201 to prevent it from mutual oil leakage with the lubricating oil in the lubricating chamber, thereby further reducing the risk of fuel leakage. The above-mentioned oil return structure has a simple structure, reduces the processing cost and difficulty of the pump body 1, and reduces the risk of assembly failure. Figure 4 As shown, in the oil return structure of other pump oil system structures, it is necessary to open a pump body oil return hole 102 on the pump body 1, and the methanol leaked downward from the plunger 3 flows back through the pump body oil return hole 102 and then through the oil channel inside the pump body 1. By simplifying the structure of the pump body 1, the need to process the oil return hole is eliminated, the processing difficulty is reduced, and the manufacturing cost and complexity of the production process are reduced.

[0066] A first sealing ring 12 made of fluorosilicone rubber is provided between the oil outlet valve joint 11 and the plunger sleeve 2 to ensure the sealing between the oil outlet valve joint 11 and the plunger sleeve 2 to prevent the fuel from leaking out of the pump; a second sealing ring 13 and a fourth sealing ring 15 made of fluorosilicone rubber are provided between the plunger sleeve 2 and the pump body 1, and the second sealing ring 13 ensures the sealing between the pump body 1 and the plunger sleeve 2 to prevent the fuel from leaking out of the pump. The plunger oil seal 16 is a third sealing ring 14 made of fluorosilicone rubber, and the fluorosilicone rubber material has methanol resistance. The fourth sealing ring 15 is used to seal the upward lubricating oil to further reduce the risk of fuel leakage and mutual crosstalk.

[0067] By adding a multi-layer sealing ring and a plunger oil seal 16 structure, it is suitable for the low viscosity characteristic of methanol fuel to prevent internal and external leakage of methanol from endangering product and personal safety.

[0068] The oil outlet valve connector 11 and the plunger sleeve 2 are connected by threads. The plunger sleeve 2 is arranged inside the pump body 1 to facilitate pressurizing the fuel. The plunger sleeve 2 is connected to the pump body 1 by screw threads so that the plunger sleeve 2 is fixed on the pump body 1.

[0069] Working principle of the utility model: during assembly, the plunger oil seal 16 is press-fitted into the plunger sleeve 2, the plunger 3 is connected during the press-fitting process, the oil inlet valve spring 4, the oil inlet valve core 5, the oil inlet valve seat 6, and the oil outlet valve seat 7 are sequentially placed into the plunger cavity 202, the oil outlet valve ball 8 is placed on the sealing cone surface of the oil outlet valve seat 7, and then the oil outlet valve joint 11 with the first sealing ring 12 and the volume reducer 10 are installed on the plunger sleeve 2, the oil outlet valve spring 9 abuts the oil outlet valve ball 8, the oil outlet valve joint 11 is tightened, the second sealing ring 13, the third sealing ring 14 and the fourth sealing ring 15 are sequentially arranged on the outer ring of the plunger sleeve 2 to realize the assembly, at this time, the oil outlet valve ball 8 is pressed against the sealing cone surface on the oil outlet valve seat 7 under the elastic force of the oil outlet valve spring 9, and the oil outlet valve seat 7 is in a closed state, and then the plunger sleeve 2 is placed into the pump body 1, the pump body 1 and the plunger sleeve 2 are fixedly connected by screws to complete the assembly.

[0070] During operation, the plunger 3 moves downward, the fuel pressure in the plunger cavity 202 decreases, the outlet valve ball 8 abuts against the sealing cone surface under the action of the pressure in the high-pressure fuel cavity 1101 and the outlet valve spring 9, the outlet valve is closed, the low-pressure fuel overcomes the elastic force of the inlet valve spring 4, the inlet valve core 5 leaves the inlet valve seat 6, the inlet valve opens, and the low-pressure fuel enters the plunger cavity 202 through the low-pressure oil inlet hole 601 and the inlet valve cavity 602; when the plunger 3 moves upward, the fuel in the plunger cavity 202 is compressed, When the oil pressure is higher than the pressure in the low-pressure fuel chamber 101, the oil inlet valve core 5 moves upward to abut against the oil inlet valve seat 6, the oil inlet valve is closed, and the fuel pressure in the plunger chamber 202 continues to rise. When the fuel pressure is higher than the pressure in the high-pressure fuel chamber 1101, the oil outlet valve ball 8 overcomes the elastic force of the oil outlet valve spring 9 and separates from the sealing cone surface, the oil outlet valve opens, and the fuel in the plunger chamber 202 enters the high-pressure fuel chamber 1101 through the high-pressure oil outlet hole 603 and the oil outlet valve seat 7, completing the pressurized delivery of the fuel.

[0071] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pump oil system structure for a methanol pump, characterized in that: include: Pump body (1); A plunger sleeve (2) is arranged in the pump body (1) and is provided with a low-pressure fuel chamber (101); The plunger (3) is movably connected in the cavity of the plunger sleeve (2). an oil inlet valve mounted on the plunger sleeve (2), a plunger cavity (202) capable of communicating with the low-pressure fuel cavity (101) being formed between the plunger (3) and the oil inlet valve, and the oil inlet valve is provided with a high-pressure oil outlet hole (603); An oil outlet valve, mounted on the plunger sleeve (2), the oil outlet valve being provided with a high-pressure fuel chamber (1101) capable of communicating with the high-pressure oil outlet hole (603); When the plunger (3) moves to the first position, the oil inlet valve can be opened and the oil outlet valve can be closed at the same time, so that the low-pressure fuel chamber (101) and the plunger chamber (202) are connected; When the plunger (3) moves to the second position, the oil inlet valve can be closed and the oil outlet valve can be opened at the same time, so that the high-pressure fuel chamber (1101) and the high-pressure oil outlet hole (603) are connected.

2. A pump oil system structure for a methanol pump according to claim 1, characterized in that: The oil inlet valve comprises: An oil inlet valve seat (6) is arranged in the cavity of the plunger sleeve (2), the oil inlet valve seat (6) comprises an oil inlet valve middle cavity (6a), the high-pressure oil outlet hole (603) penetrates the upper and lower ends of the oil inlet valve seat (6), and the plunger cavity (202) is formed between the plunger (3) and the oil inlet valve seat (6); An oil inlet valve core (5) movably connected to the oil inlet valve middle cavity (6a) and capable of sealingly cooperating with the oil inlet valve middle cavity (6a); An oil inlet valve spring (4) is arranged in the cavity of the plunger sleeve (2), and two ends of the oil inlet valve spring (4) respectively abut against the oil inlet valve core (5) and the inner side wall of the cavity of the plunger sleeve (2).

3. A pump oil system structure for a methanol pump according to claim 2, characterized in that: The oil inlet valve seat (6) is provided with an oil inlet valve cavity (602), at least one low-pressure oil inlet hole (601) and at least one high-pressure oil outlet hole (603); one end of the oil inlet valve cavity (602) is connected to the plunger cavity (202), and the other end is connected to the low-pressure fuel cavity (101) through the low-pressure oil inlet hole (601); the oil inlet valve core (5) extends into the oil inlet valve cavity (602); one end of the high-pressure oil outlet hole (603) is connected to the plunger cavity (202).

4. A pump oil system structure for a methanol pump according to claim 2, characterized in that: A valve seat sealing step (2011) is provided in the plunger cavity (202), and the oil inlet valve seat (6) abuts against the valve seat sealing step (2011).

5. The pump oil system structure for a methanol pump according to claim 3, characterized in that: The oil inlet valve seat (6) and the oil inlet valve core (5) are sealed via a conical surface to form the oil inlet valve chamber (602).

6. The pump oil system structure for a methanol pump according to claim 1, characterized in that: The oil outlet valve comprises: An oil outlet valve connector (11) is connected to the end of the plunger sleeve (2), and a volume reducing body (10) is arranged in the oil outlet valve connector (11); An oil outlet valve seat (7) connected to the oil outlet valve connector (11), the oil outlet valve seat (7); An oil outlet valve ball (8) cooperates with the oil outlet valve seat (7) and is limited by the volume reducing body (10); An oil outlet valve spring (9) abuts against the volume reducing body (10) and the oil outlet valve ball (8) respectively; Wherein, the high-pressure fuel chamber (1101) is formed between the oil outlet valve seat (7) and the volume reduction body (10).

7. A pump oil system structure for a methanol pump according to claim 6, characterized in that: The oil outlet valve connector (11) and the plunger sleeve (2) are connected via threads, and a first sealing ring (12) made of fluorosilicone rubber is provided between the two.

8. The pump oil system structure for a methanol pump according to claim 6, characterized in that: The oil outlet valve seat (7) is provided with a conical surface which seals with the oil outlet valve ball (8).

9. The pump oil system structure for a methanol pump according to claim 6, characterized in that: The plunger sleeve (2) is respectively provided with a plunger sleeve oil return hole (201) which is in communication with the low-pressure fuel chamber (101); a plunger oil seal (16) is provided between the plunger sleeve (2) and the plunger (3); the outer surface of the plunger oil seal (16) abuts against the inner wall of the plunger sleeve (2); methanol leaking downward through the plunger (3) can flow back to the low-pressure fuel chamber (101) through the plunger sleeve oil return hole (201).

10. A pump oil system structure for a methanol pump according to claim 9, characterized in that: A second sealing ring (13) and a fourth sealing ring (15) each made of fluorosilicone rubber are provided between the plunger sleeve (2) and the pump body (1), and the plunger oil seal (16) is a third sealing ring (14) made of fluorosilicone rubber.

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