Oil delivery pump structure and oil delivery pump

Abstract

The utility model discloses an oil delivery pump structure and an oil delivery pump, and relates to the technical field of oil injection systems, the oil delivery pump structure comprises a shell and a valve body, the shell comprises an oil inlet and an oil outlet, the oil inlet and the oil outlet can be communicated through a first channel, and the valve body can move relative to the first channel to seal or open the first channel; a second channel for communicating the oil inlet with the oil outlet is arranged in the valve body, and a one-way module for limiting one-way flow of fluid from the oil inlet to the oil outlet is arranged in the valve body; the double functions of exhausting and pressure relief can be achieved, the structure is compact, and the production and installation cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection systems, in particular to a fuel transfer pump structure and a fuel transfer pump. Background Art

[0002] With the increasingly stringent automotive exhaust emission regulations, the high-pressure common rail fuel injection system is the most effective means for diesel engines to meet the emission regulations. As one of the important components of this system, the fuel pump plays a role in stably supplying the required fuel volume and pressure for the fuel injection pump.

[0003] Most of the existing fuel pumps are installed with a check valve and a safety valve separately. The check valve ensures the smooth discharge of gas in the low-pressure oil circuit of the fuel pump, and the safety valve prevents the pressure at the outlet of the fuel pump from being too high and releases the pressure in a timely manner. The two jointly maintain the stable oil pressure and normal operation inside the fuel pump. However, when installing the check valve and the valve body separately, a large number of components are required, the structure is redundant, the installation process is complex, and both the product production cost and the labor cost are greatly increased. Summary of the Utility Model

[0004] In view of the deficiencies in the prior art, the utility model provides a fuel transfer pump structure, which integrates a bypass valve and a valve body, can play a dual role of exhausting gas and releasing pressure, has a compact structure, and saves production and installation costs.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A fuel transfer pump structure includes: a housing and a valve body. The housing includes an oil inlet and an oil outlet, and the two can be connected through a first channel. The valve body can move relative to the first channel to seal or open the first channel; a second channel connecting the oil inlet and the oil outlet is provided inside the valve body, and a one-way module for restricting the one-way flow of fluid from the oil inlet to the oil outlet is provided inside the valve body.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] The fuel transfer pump sucks the oil from the oil inlet, and the oil reaches the oil outlet through the second channel, thereby exhausting the air inside the fuel transfer pump and the oil; realizing the function of the bypass valve. When the outlet pressure of the fuel transfer pump is too high, due to the restriction of the one-way module, the oil cannot return from the second channel to the oil inlet. At this time, the pressure below the valve body is higher than the pressure above the valve body, and the oil drives the valve body to move upward relative to the first channel until the valve body and the first channel are unsealed. At this time, the oil returns from the gap between the valve body and the first channel to the oil inlet, realizing the pressure relief function.

[0009] It can be seen that the structure of this fuel transfer pump integrates the bypass valve and safety valve structures, enabling the functions of the bypass valve and safety valve in the fuel transfer pump to be switched with each other, achieving dual use of one component, reducing the production cost and labor cost of each component, and at the same time making the overall structure of the fuel transfer pump simpler, more compact and safer.

[0010] As a preferred solution, the valve body includes a valve core and upper and lower valve seats arranged at both ends thereof. The upper valve seat is installed on the housing, and the upper and lower valve seats are elastically connected by an elastic member. A first sealing surface is provided on the outer wall of the valve seat, and a second sealing surface matching the first sealing surface is provided on the inner wall of the housing.

[0011] As a preferred solution, the first sealing surface and the second sealing surface are configured as inclined surfaces.

[0012] As a preferred solution, protrusions are provided on both the upper valve seat and the lower valve seat. The elastic member includes a spring, and both ends of the spring are respectively sleeved outside the protrusions.

[0013] As a preferred solution, the one-way module includes a body and a valve tongue, and the valve tongue can move to seal or communicate the second channel.

[0014] As a preferred solution, the second channel includes an oil cavity provided in the valve core, a first oil hole connecting the oil inlet and the oil cavity, a second oil hole provided in the lower valve seat and communicating with the oil cavity, and a third oil hole provided in the valve core. An oil groove communicating with the third oil hole is provided on the body, the valve tongue is located in the oil groove, the valve tongue is in close contact and sealed with the bottom end of the lower valve seat, and when stressed, the valve tongue can deform to connect the second oil hole and the third oil hole.

[0015] As a preferred solution, the valve tongue is configured as a long strip, and one end of the valve tongue is fixedly provided on the body.

[0016] The present utility model also provides a fuel transfer pump, which integrates the bypass valve and the valve body into one body, can play a dual role of exhausting air and relieving pressure, has a compact structure and high safety.

[0017] To achieve the above object, the present utility model adopts the following technical solutions:

[0018] A fuel transfer pump includes the fuel transfer pump structure described in any one of the above.

[0019] Compared with the prior art, the present utility model has the following beneficial effects:

[0020] The structure of this oil transfer pump integrates the bypass valve and safety valve structures, enabling the functions of the bypass valve and safety valve in the oil transfer pump to be switched with each other, achieving the dual use of one device, reducing the production costs and labor costs of each component, and at the same time making the overall structure of the oil transfer pump simpler, more compact and safer. Description of the Drawings

[0021] Figure 1 is a schematic cross-sectional structure diagram of the oil transfer pump;

[0022] Figure 2 is Figure 1 the structure diagram of the one-way module in

[0023] In the above-mentioned drawings:

[0024] 1. Housing; 2. Inlet; 3. Outlet; 4. First sealing surface; 5. Spool; 6. Upper valve seat; 7. Lower valve seat; 8. Elastic member; 9. Oil cavity; 10. First oil hole; 11. Second oil hole; 12. Third oil hole; 13. Body; 14. Valve tongue; 15. Oil groove. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; the structures described in various embodiments can be freely combined without conflicts in terms of structure or principle.

[0026] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of this utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, terms such as "first" and "second" are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0028] The following is a description of some embodiments of the present invention in conjunction with the accompanying drawings:

[0029] like Figure 1 As shown, the utility model proposes an oil pump structure. For ease of understanding, the oil pump structure is combined with the oil pump for explanation. Specifically, the oil pump structure includes a housing 1 and a valve body installed in the housing 1. The housing 1 is provided with an oil inlet 2 and an oil outlet 3. In order to realize the oil pumping function, it should be understood that the oil pump is also provided with other structures, but they are prior arts and are not an improvement point of the present invention, and will not be described in detail here. A vertically extending first channel is provided in the housing 1, and the first channel can connect the oil inlet 2 and the oil outlet 3. The valve body is installed in the first channel and the two are provided with mutually matching sealing areas. Preferably, a first sealing surface 4 is provided on the outer wall of the valve body, and a second sealing surface is provided on the inner wall of the channel. Under normal conditions, the first sealing surface 4 and the second sealing surface fit together, thereby closing the first channel. In order to enable the first channel to open automatically when the pressure of the oil outlet 3 is too high, the valve body is configured to be movable up and down relative to the first channel; illustratively, the valve body is designed to include a valve core 5, an upper valve seat 6 and a lower valve seat 7, and the upper valve seat 6 is installed on the housing 1. illustratively, the upper valve seat 6 is press-fitted into the mounting groove designed in the housing 1 by interference fit; in order to avoid oil leakage, a sealing ring is designed between the upper valve seat 6 and the housing 1. The upper valve seat 6 and the lower valve seat 7 are elastically connected by an elastic member 8 to ensure that the lower valve seat 7 can move relative to the first channel. In addition, the elastic member 8 can also make the first sealing surface 4 and the second sealing surface fit in a normal state; the elastic member 8 takes a spring as an example, and the upper valve seat 6 and the lower valve seat 7 are both provided with protrusions at the opposite ends, and the upper and lower ends of the spring are respectively sleeved outside the protrusions of the upper valve seat 6 and the lower valve seat 7. The structure is simple and easy to disassemble and assemble.

[0030] In order to realize the bypass function, a second channel connecting the oil inlet 2 and the oil outlet 3 is provided in the valve body. Specifically, the second channel includes an oil chamber 9 provided in the valve core 5, a first oil hole 10 connecting the oil inlet 2 and the oil chamber 9, a second oil hole 11 provided in the lower valve seat 7 and connected to the oil chamber 9, and a third oil hole 12 provided in the valve core 5. A one-way module for limiting the one-way flow of fluid from the oil inlet 2 to the oil outlet 3 is provided between the second oil hole 11 and the third oil hole 12. Figure 2 As shown, exemplarily, the one-way module includes a main body 13 and a valve tongue 14. The main body 13 is provided with an oil groove 15 connected to the third oil hole 12. The valve tongue 14 is located in the oil groove 15. The valve tongue 14 is sealed with the bottom end of the lower valve seat 7. When subjected to force, the valve tongue 14 can bend and deform downward to connect the second oil hole 11 and the third oil hole 12.

[0031] Using the above solution,

[0032] In the initial state, the top end of the valve tongue 14 is in contact with the bottom end face of the lower valve seat 7, thereby sealing the second oil hole 11 and cutting off the passage between the second oil hole 11 and the third oil hole 12. When oil is being fed in, the oil transfer pump sucks external oil through the oil inlet 2 into the oil chamber 9 of the valve body. Subsequently, the oil passes through the second oil hole 11. At this time, the valve tongue 14 is pressured and undergoes a downward flexural deformation until it disengages from the bottom end face of the lower valve seat 7, achieving the connection between the second oil hole 11 and the third oil hole 12. Subsequently, the oil passes through the oil groove 15 and is finally discharged from the oil outlet 3, realizing the function of bypass exhaust.

[0033] When the oil pressure at the oil outlet 3 is too high, the oil pressure causes the valve tongue 14 to always be in contact with the bottom end face of the lower valve seat 7. At this time, the passage between the second oil hole 11 and the third oil hole 12 is cut off, and the bypass function stops. When the oil pressure below the valve body is higher than the oil pressure above the valve body and the elastic force of the spring, the valve body moves upward along the first passage until the first sealing surface 4 on the outer wall of the valve body and the second sealing surface on the inner wall of the first passage are disengaged from the contact seal. Then, the oil flows back from the gap between the first sealing surface 4 and the second sealing surface to the oil inlet 2, realizing pressure relief.

[0034] This oil transfer pump structure integrates a bypass valve and a safety valve, enabling the functions of the bypass valve and the safety valve in the oil transfer pump to be switched with each other, achieving dual use of one device, reducing the production costs and labor costs of each component, and at the same time making the overall structure of the oil transfer pump simpler, more compact, and safer.

[0035] As a preferred solution, the first sealing surface 4 and the second sealing surface are configured as inclined surfaces to optimize the sealing structure and improve the sealing effect.

[0036] As a preferred solution, as Figure 2 shown, the valve tongue 14 is configured as a long strip, and one end of the valve tongue 14 is fixedly provided on the body 13. In this way, after the valve tongue 14 is opened, the force-bearing area of the valve tongue 14 is larger, and the longer the cantilever beam, the smaller the force required to open the end, making it easier to exhaust.

[0037] The present utility model also provides an oil transfer pump, including the oil transfer pump structure of any one of the above.

[0038] This oil transfer pump structure integrates a bypass valve and a safety valve structure, enabling the functions of the bypass valve and the safety valve in the oil transfer pump to be switched with each other. That is, it can realize the exhaust function of the oil transfer pump during normal operation and can also play a role in protecting the oil circuit when the oil pressure is too high, achieving dual use of one device. It reduces the production costs and labor costs of each component, and at the same time makes the overall structure of the oil transfer pump simpler, more compact, and safer.

Claims

1. An oil pump structure, characterized in that: include: A shell (1) and a valve body, wherein the shell (1) comprises an oil inlet (2) and an oil outlet (3) which are connected via a first channel, and the valve body is movable relative to the first channel to seal or open the first channel; a second channel connecting the oil inlet (2) and the oil outlet (3) is provided in the valve body, and a one-way module for limiting the one-way flow of fluid from the oil inlet (2) to the oil outlet (3) is provided in the valve body.

2. The oil pump structure according to claim 1, characterized in that: The valve body comprises a valve core (5) and an upper valve seat (6) and a lower valve seat (7) arranged at both ends thereof; the upper valve seat (6) is mounted on the shell (1); the upper valve seat (6) and the lower valve seat (7) are elastically connected via an elastic member (8); the outer wall of the valve seat is provided with a first sealing surface (4); and the inner wall of the shell (1) is provided with a second sealing surface matching the first sealing surface (4).

3. The oil pump structure according to claim 2, characterized in that: The first sealing surface (4) and the second sealing surface are configured as inclined surfaces.

4. The oil pump structure according to claim 3, characterized in that: The upper valve seat (6) and the lower valve seat (7) are both provided with protrusions, and the elastic member (8) comprises a spring, and the two ends of the spring are respectively sleeved outside the protrusions.

5. The oil pump structure according to any one of claims 2 to 4, characterized in that The one-way module comprises a body (13) and a valve tongue (14), and the valve tongue (14) is movable to close or connect the second channel.

6. The oil pump structure according to claim 5, characterized in that: The second passage comprises an oil chamber (9) arranged in the valve core (5), a first oil hole (10) connecting the oil inlet (2) and the oil chamber (9), a second oil hole (11) arranged on the lower valve seat (7) and connected to the oil chamber (9), and a third oil hole (12) arranged on the valve core (5); an oil groove (15) connected to the third oil hole (12) is provided on the body (13); the valve tongue (14) is located in the oil groove (15); the valve tongue (14) is sealed against the bottom end of the lower valve seat (7); when subjected to force, the valve tongue (14) can be deformed to connect the second oil hole (11) and the third oil hole (12).

7. The oil pump structure according to claim 6, characterized in that: The valve tongue (14) is configured in a long strip shape, and one end of the valve tongue (14) is fixedly arranged on the body (13).

8. An oil pump, characterized in that: It comprises the oil pump structure according to any one of claims 1 to 7.

Images