CN219387983U

CN219387983U - Pump head and diesel pump of high-efficient oil return

Info

Publication number: CN219387983U
Application number: CN202320176008.8U
Authority: CN
Inventors: 王彬; 傅爱杰; 燕朋博; 孙超; 马君
Original assignee: Borgwarner Fuel Systems Yantai Co ltd
Current assignee: Borgwarner Fuel Systems Yantai Co ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-07-21
Anticipated expiration: 2033-02-07

Abstract

The utility model relates to a pump head with efficient oil return and a diesel pump, the pump head comprises a pump head body, an oil inlet cavity, a pump oil cavity and a sealing cavity are arranged in the pump head body, one end of the pump oil cavity is communicated with the oil inlet cavity, the other end of the pump oil cavity is communicated with the sealing cavity, an annular groove I is arranged on the outer side wall of the pump head body, the sealing cavity is communicated with the annular groove I through an oil return channel, and the annular groove I is positioned at one end far away from the oil inlet cavity. The annular groove I is arranged on the outer side wall of the pump head body, so that diesel oil flowing out of a gap between the oil pumping cavity and the plunger piston is recovered, the part of diesel oil is prevented from being returned to the oil pumping cavity, the requirements on oil return pressure and plunger piston sealing performance are reduced, the cost is saved, and the problem of engine abrasion caused by the influence of diesel oil penetration into engine oil on the lubricating performance of the engine oil is solved; the annular oil groove I is arranged far away from the oil inlet cavity, so that the length of an oil return passage is reduced, the processing difficulty is reduced, and the cost is saved; the temperature influence caused by returning the return oil to the oil inlet cavity is avoided, and the durable service life of the product is prolonged.

Description

Pump head and diesel pump of high-efficient oil return

Technical Field

The utility model relates to the technical field of diesel pumps, in particular to a pump head capable of efficiently returning oil and a diesel pump.

Background

The engine oil lubrication type diesel pump comprises a pump head body, an oil inlet valve cavity and an oil pumping cavity are arranged in the pump head body, a plunger is arranged in the oil pumping cavity, the lower end of the plunger penetrates through an oil seal to be connected with a cam in a transmission manner, and the plunger moves back and forth along the oil pumping cavity under the pushing of the cam to pressurize diesel oil in the upper end oil inlet cavity, so that high-pressure oil pumping is realized. In the working process, diesel oil in the oil pumping cavity easily flows into the sealing cavity along a gap between the plunger and the oil pumping cavity, so that not only is the diesel oil wasted, but also the diesel oil is easily permeated into engine oil at the cam, so that the lubricating performance of the engine oil is reduced, moving parts of the engine such as a crankshaft, the cam and the like are worn until scrapped, and the service life of the engine is influenced.

In order to avoid diesel oil from being mixed into engine oil, in the prior art, an oil return oil passage is usually processed on a pump body to guide the diesel oil in a gap between a plunger and an oil cavity of the pump into an oil inlet valve cavity, so that the oil return oil passage is long, the processing difficulty is high, the cost is high, and the pressure of the oil inlet valve cavity is higher than the oil return pressure in the gap of the plunger under the normal condition, and the pressure generated when the oil inlet valve is closed is higher. If the plunger gap oil return is selected to return to the oil inlet valve cavity, the gap oil return pressure is required to be larger than the oil inlet valve cavity, and an oil seal with better sealing performance is required to be matched with the oil seal, so that the design cost is increased. In addition, as the plunger clearance oil return is generated in the process of compressing fuel oil by the plunger, the temperature is relatively high, and if the part of oil is returned to the oil inlet valve cavity, the oil inlet temperature is directly increased, so that risks of plunger abrasion, reduced volumetric efficiency and the like are increased, and the durable service life of products is further influenced.

Disclosure of Invention

The utility model aims to solve one or more of the technical problems and provides a pump head and a diesel pump with efficient oil return.

The technical scheme for solving the technical problems is as follows: the utility model provides a pump head of high-efficient oil return, includes the pump head body, be equipped with oil inlet chamber, pump oil chamber and sealed chamber in the pump head body, the one end of pump oil chamber with oil inlet chamber intercommunication, the other end with sealed chamber intercommunication, be equipped with annular groove one on the lateral wall of the pump head body, sealed chamber through the oil return passageway with annular groove one communicates, annular groove one is located keeping away from the one end of oil inlet chamber.

The beneficial effects of the utility model are as follows: the annular groove I is arranged on the outer side wall of the pump head body, so that diesel oil flowing out of a gap between the oil pumping cavity and the plunger piston is recovered, the part of diesel oil is prevented from being returned to the oil pumping cavity, the requirements on oil return pressure and plunger piston sealing performance are reduced, the cost is saved, and the problem of engine abrasion caused by the influence of diesel oil penetration into engine oil on the lubricating performance of the engine oil is solved; the annular oil groove I is arranged far away from the oil inlet cavity, so that the length of an oil return passage is reduced, the processing difficulty is reduced, and the cost is saved; the temperature influence caused by return oil returning to the oil inlet cavity is avoided, the risk of plunger abrasion and reduction of volumetric efficiency is reduced, and the durable service life of the product is prolonged.

On the basis of the technical scheme, the utility model can also make the following improvements for the technical scheme in order to achieve the convenience of use and the stability of equipment:

preferably, sealing grooves are formed in two sides of the first annular groove, and sealing rings are arranged in the sealing grooves. The tightness is ensured, and the leakage of oil return is avoided.

Preferably, the cross section of the first annular groove is arc-shaped. The processing is convenient and form the oil storage space, reduces the risk of plunger return oil infiltration machine oil, guarantees in time discharging the plunger return oil to annular groove one.

Preferably, the oil return channel comprises a first oil channel and a second oil channel, the first oil channel is obliquely arranged, one end of the first oil channel is communicated with the sealing cavity, the other end of the first oil channel is communicated with the second oil channel, and the second oil channel is communicated with the first annular groove. The plunger oil return is recovered into the annular groove I through the oil duct I and the oil duct II, so that the length of an oil return channel is reduced, the processing difficulty is reduced, and the processing cost is saved.

Preferably, the diameter of the second oil passage is larger than the diameter of the first oil passage. The oil pressure in the first oil passage is higher than that in the second oil passage, so that the pressurizing effect is achieved, the return oil of the plunger can smoothly flow into the first annular groove, and meanwhile the processing difficulty can be further reduced.

Preferably, the oil pump further comprises an oil inlet valve, an oil seal and a plunger, wherein the oil inlet valve is arranged in the oil inlet cavity, the plunger is arranged in the oil pump cavity and reciprocates along the oil pump cavity, the oil seal is arranged in the sealing cavity, and the length of the oil seal is smaller than that of the sealing cavity.

The utility model also discloses a diesel pump, which comprises a shell and the pump head, wherein the pump head is arranged in the shell, an annular groove II is formed in the inner side wall of the shell, the annular groove II is matched with the annular groove I to form an annular oil cavity, and an oil drain port is formed in the annular groove II.

The beneficial effects of the utility model are as follows: through setting up annular groove two and oil drain port in the casing, with the total oil return of plunger oil return and diesel pump meet, do not receive the restriction of oil return pipeline direction, realize 360 matches, improved the flexibility in oil drain port position, reduced the processing degree of difficulty, practiced thrift the processing cost.

Drawings

FIG. 1 is a schematic cross-sectional view of a pump head of the present utility model;

FIG. 2 is a schematic front view of a pump head according to the present utility model;

FIG. 3 is a schematic perspective view of a pump head of the present utility model;

FIG. 4 is a schematic cross-sectional view of the diesel pump of the present utility model;

FIG. 5 is a schematic view of the second annular groove and the oil drain.

The reference numerals are recorded as follows: 1. a pump head body; 2. an oil inlet cavity; 3. a pumping chamber; 4. sealing the cavity; 5. an oil inlet valve; 6. an oil seal; 7. an oil return passage; 7.1, an oil duct I; 7.2, oil duct II; 8. an annular groove I; 9. a seal ring; 10. a plunger; 11. an oil outlet channel; 12. a housing; 13. annular grooves II; 14. and an oil discharge port.

Detailed Description

The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.

As shown in fig. 1 to 3, the utility model discloses a pump head with efficient oil return, which comprises a pump head body 1, wherein an oil inlet cavity 2, an oil pumping cavity 3 and a sealing cavity 4 are arranged in the pump head body 1, one end of the oil pumping cavity 3 is communicated with the oil inlet cavity 2, the other end of the oil pumping cavity is communicated with the sealing cavity 4, an annular groove I8 is formed in the outer side wall of the pump head body 1, the sealing cavity 4 is communicated with the annular groove I8 through an oil return channel 7, and the annular groove I8 is positioned at one end far away from the oil inlet cavity 2.

The pump head further comprises an oil inlet valve 5, an oil seal 6 and a plunger 10, wherein the oil inlet valve 5 is arranged in the oil inlet cavity 2, the plunger 10 is arranged in the oil pumping cavity 3, the plunger 10 penetrates through the sealing cavity 4 to be connected with a cam in a transmission mode, the plunger 10 reciprocates along the oil pumping cavity 3 under the action of the cam, when the plunger 10 moves, high pressure is generated in the oil pumping cavity 3, part of diesel oil in the oil pumping cavity 3 easily flows into the sealing cavity 4 along a gap between the plunger 10 and the oil pumping cavity 3, the part of diesel oil is called plunger oil return, the oil seal 6 is arranged in the sealing cavity 4, the lubricating property of engine oil can be influenced due to the fact that the plunger oil return penetrates into the engine oil can be avoided, the length of the oil seal 6 is smaller than the length of the sealing cavity 4, the effect of primary storage is achieved on plunger oil return, and the lubricating property of the engine oil can be prevented from being influenced due to the fact that the plunger oil return penetrates into the engine oil through the oil seal 6. Plunger return oil in the sealing cavity 4 flows into the annular groove I8 through the return oil channel 7, the plunger return oil is recovered, the part of diesel oil is prevented from returning to the oil inlet cavity 2, the requirements on return oil pressure and sealing performance of the plunger 10 are reduced, the cost is saved, and the problem of engine abrasion caused by the influence of diesel oil penetration into engine oil on lubricating performance of the engine oil is solved.

The two sides of the first annular groove 8 are respectively provided with a sealing groove, a sealing ring 9 is arranged in each sealing groove, and each sealing ring 9 is an O-shaped sealing ring. The tightness is ensured, and the leakage of the return oil of the plunger is avoided.

The cross section of the first annular groove 8 is arc-shaped. The processing is convenient and form the oil storage space, reduces the risk of plunger return oil infiltration machine oil, guarantees in time discharging the plunger return oil to annular groove one 8.

The oil return channel 7 comprises an oil duct I7.1 and an oil duct II 7.2, the oil duct I7.1 is obliquely arranged, one end of the oil duct I7.1 is communicated with the sealing cavity 4, the other end of the oil duct I is communicated with the oil duct II 7.2, and the oil duct II 7.2 is radially arranged along the pump head body 1 and is communicated with the annular groove I8. The plunger return oil is recovered into the annular groove I8 through the oil duct I7.1 and the oil duct II 7.2, so that the overall length of the return oil channel 7 is reduced, the processing difficulty is reduced, and the processing cost is saved.

The diameter of the oil passage II 7.2 is larger than that of the oil passage I7.1. The oil pressure in the first oil passage 7.1 is higher than that in the second oil passage 7.2, so that the pressurizing effect is achieved, the oil returning of the plunger 10 smoothly flows into the first annular groove 8, and meanwhile the processing difficulty can be further reduced.

As shown in fig. 4 to 5, the utility model also discloses a diesel pump, which comprises a shell 12 and the pump head, wherein the pump head is arranged in the shell 12, an annular groove II 13 is formed in the inner side wall of the shell 12, the annular groove II 13 is matched with the annular groove I8 to form an annular oil cavity, and an oil drain port 14 is formed in the annular groove II 13. When the plunger 10 moves downwards, diesel oil enters the pump oil cavity 3 where the plunger 10 is located by opening the oil inlet valve 5, when the plunger 10 moves upwards, the oil inlet valve 5 is closed, the plunger 10 compresses the diesel oil in the pump oil cavity 3 to generate high pressure, and an oil outlet valve in the oil outlet channel 11 is opened to pump the diesel oil at high pressure. The oil outlet valve adopts the existing structure and is not shown in the figure.

In the upward movement process of the plunger 10, as a certain gap exists between the plunger 10 and the pump oil cavity 3, part of diesel oil is discharged to the upper end of the seal cavity 4 through the gap, and certain pressure exists in the diesel oil in the seal cavity 4, so that the diesel oil can be discharged into the annular oil cavity through the oil return channel 7, the oil in the annular oil cavity is converged with the total oil return of the diesel pump through the oil discharge port 14 on the annular groove II 13, the temperature influence caused by the return of the plunger oil to the oil inlet cavity 2 is avoided, and the durable service life of the diesel pump is prolonged; the annular oil cavity structure is not limited by the direction of the oil return pipeline, can realize 360-degree matching, reduces the processing difficulty and saves the processing cost.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims

1. The utility model provides a pump head of high-efficient oil return, its characterized in that, including pump head body (1), be equipped with oil inlet chamber (2), pump oil chamber (3) and sealed chamber (4) in pump head body (1), the one end in pump oil chamber (3) with oil inlet chamber (2) intercommunication, the other end with sealed chamber (4) intercommunication, be equipped with annular groove one (8) on the lateral wall of pump head body (1), sealed chamber (4) through oil return channel (7) with annular groove one (8) intercommunication, annular groove one (8) are located keep away from oil inlet chamber (2) one end.

2. The efficient oil return pump head of claim 1, wherein sealing grooves are formed in two sides of the first annular groove (8), and sealing rings (9) are arranged in the sealing grooves.

3. A pump head for efficient oil return according to claim 1, characterized in that the cross section of the annular groove one (8) is arc-shaped.

4. The efficient oil return pump head according to claim 2, wherein the oil return channel (7) comprises an oil passage one (7.1) and an oil passage two (7.2), the oil passage one (7.1) is obliquely arranged, one end of the oil passage one (7.1) is communicated with the sealing cavity (4), the other end of the oil passage one (7.1) is communicated with the oil passage two (7.2), and the oil passage two (7.2) is communicated with the annular groove one (8).

5. The efficient oil return pump head of claim 4 wherein the diameter of the second oil passage (7.2) is greater than the diameter of the first oil passage (7.1).

6. The efficient oil return pump head according to claim 1, further comprising an oil inlet valve (5), an oil seal (6) and a plunger (10), wherein the oil inlet valve (5) is installed in the oil inlet cavity (2), the plunger (10) is installed in the pump oil cavity (3) and reciprocates along the pump oil cavity (3), the oil seal (6) is installed in the seal cavity (4), and the length of the oil seal (6) is smaller than the length of the seal cavity (4).

7. The diesel pump comprises a shell (12), and is characterized by further comprising the pump head according to any one of claims 1 to 6, wherein the pump head is installed in the shell (12), an annular groove II (13) is formed in the inner side wall of the shell (12), the annular groove II (13) is matched with the annular groove I (8) to form an annular oil cavity, and an oil drain port (14) is formed in the annular groove II (13).