Oil inlet pressure relief device of high-pressure oil pump

Abstract

The utility model relates to the technical field of oil pumps, and discloses a high-pressure oil pump oil inlet pressure relief device which comprises a pressure relief valve assembly, an oil inlet hole is formed in the front wall of the pressure relief valve assembly, the bottom end of the pressure relief valve assembly is in threaded connection with an adapter sleeve, a filter element is installed in the adapter sleeve, the bottom end of the adapter sleeve is fixedly connected with an adapter pipe, and the adapter pipe is fixedly connected with the oil inlet hole. A second oil return pipe is fixedly connected to one side of the adapter pipe, a first oil return pipe is fixedly connected to the side, away from the second oil return pipe, of the adapter pipe, and the first oil return pipe is inserted into a backflow hole of the pressure release valve assembly. According to the technical scheme, the filter element can be installed outside the oil inlet port of the pressure release valve assembly through the reducing sleeve, diesel oil can enter the pressure release valve assembly through the reducing sleeve firstly, so that normal filtering of impurities is not affected, the reducing sleeve only needs to be screwed off from the pressure release valve assembly when the filter element is replaced, and the replacement cost is reduced. The filter element can be quickly detached and replaced, and convenience and practicability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to an oil inlet pressure relief device for a high-pressure oil pump. Background Art

[0002] The oil pump is a light and compact pump, which has three categories: in-line type, distribution type and single body type. The oil pump needs a power source to operate, and its lower camshaft is driven by the engine crankshaft gear. The oil pump proposes an oil pump having a housing made of aluminum-containing material and a movable molded part arranged in the housing, wherein the movable molded part is at least partially made of a sinterable iron-based alloy material containing at least one austenite, and wherein the molded part made of a sinterable material has a thermal expansion coefficient of at least 60% of the thermal expansion coefficient of the housing. The high-pressure oil pump of the engine is used to pressurize the fuel from low pressure to high pressure and then deliver it to the common rail.

[0003] The patent document with the published announcement number CN216554180U discloses a high-pressure oil pump oil inlet pressure relief device, which belongs to the field of engine technology and includes a pressure relief valve assembly, an oil return pipe assembly, an oil inlet pipe assembly and a bracket assembly. The bracket assembly is provided with a threaded hole, and the outer circumferential surface of the pressure relief valve assembly is provided with an external thread. The bottom of the pressure relief valve assembly passes through the oil return pipe assembly and the oil inlet pipe assembly in turn, and the pressure relief valve assembly is screwed into the threaded hole through the external thread and fixed on the bracket assembly. A threaded seat is provided in the valve assembly, and an oil inlet hole and an oil return hole are provided on the threaded seat, and the oil inlet hole and the oil return hole penetrate the side wall of the pressure relief valve assembly, and a valve core is provided in the threaded seat, and the valve core is connected to a plugging cover through a spring, and the side walls of the return oil pipe assembly are respectively connected to an oil return connector I and an oil return connector II, and the oil inlet connector I is connected to the oil inlet pipe assembly. Through the above arrangement, the oil inlet pressure of the high-pressure oil pump can be reduced through the pressure relief valve, the pump body and sealing structure of the high-pressure oil pump can be protected, and oil leakage and oil seepage failure of the high-pressure oil pump can be prevented.

[0004] The filter element in the above document needs to be replaced after being used for a period of time. Since the filter element is installed inside the pressure relief valve assembly, the difficulty of replacing the filter element is increased. Therefore, a high-pressure oil pump oil inlet pressure relief device is required. Utility Model Content

[0005] The utility model aims to provide an oil inlet pressure relief device for a high-pressure oil pump, which solves the problems raised in the background technology.

[0006] An embodiment of the present application provides an oil inlet pressure relief device for a high-pressure oil pump, comprising a pressure relief valve assembly, a front wall of the pressure relief valve assembly is provided with an oil inlet hole, the bottom end of the pressure relief valve assembly is threadedly connected to a transfer sleeve, a filter element is installed inside the transfer sleeve, the bottom end of the transfer sleeve is fixedly connected to a transfer tube, one side of the transfer tube is fixedly connected to a second oil return pipe, the side of the transfer tube away from the second oil return pipe is fixedly connected to a first oil return pipe, the first oil return pipe is inserted into the reflux hole of the pressure relief valve assembly, the inside of the pressure relief valve assembly is fixedly connected to a spring, and one end of the spring is fixedly connected to a valve core.

[0007] By adopting the above technical solution, the filter element can be installed on the outside of the oil inlet port of the pressure relief valve assembly through the adapter sleeve. The diesel will first pass through the adapter sleeve to enter the inside of the pressure relief valve assembly, thereby not affecting the normal filtration of impurities. When replacing the filter element, it is only necessary to unscrew the adapter sleeve from the pressure relief valve assembly, and the filter element can be quickly disassembled and replaced, which is convenient and practical.

[0008] Optionally, the inner wall of the adapter sleeve is provided with an internal thread that matches the external thread of the pressure relief valve assembly.

[0009] The adoption of the technical solution is conducive to rapid disassembly and assembly between the adapter sleeve and the pressure relief valve assembly.

[0010] Optionally, the pressure relief valve assembly and the adapter sleeve are directly gasketed with a sealing gasket.

[0011] The adoption of the above technical solution is helpful to improve the sealing between the pressure relief valve assembly and the adapter sleeve.

[0012] Optionally, a connecting plate is fixedly connected to the top of the filter element, and bolts are passed through the connecting plate, and the bolts are threadedly connected to the adapter sleeve.

[0013] The adoption of the technical solution is conducive to the rapid disassembly and assembly of the filter element.

[0014] Optionally, the adapter sleeve is a stainless steel metal sleeve.

[0015] The adoption of the technical solution is beneficial to improving the strength and toughness of the adapter sleeve, and is not prone to deformation.

[0016] Optionally, two ends of the adapter sleeve are respectively connected to the pressure relief valve assembly and the adapter tube.

[0017] The adoption of the above technical solution is beneficial to the circulation of diesel.

[0018] Optionally, the diameter of the filter element is matched to the aperture of the adapter sleeve.

[0019] The adoption of the above technical solution is beneficial to improving the effect of the filter element in filtering impurities.

[0020] Optionally, the second oil return pipe is connected to the oil tank.

[0021] By adopting the above technical solution, the refluxed diesel can flow back into the fuel tank, thus avoiding the waste of oil.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] The technical solution of the present application can install the filter element on the outside of the oil inlet port of the pressure relief valve assembly through the adapter sleeve. The diesel will first pass through the adapter sleeve and enter the interior of the pressure relief valve assembly, thereby not affecting the normal filtration of impurities. When replacing the filter element, it is only necessary to unscrew the adapter sleeve from the pressure relief valve assembly. The filter element can be quickly disassembled and replaced, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of a high-pressure oil pump oil inlet pressure relief device of the utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of a high-pressure oil pump oil inlet pressure relief device of the utility model;

[0027] Figure 3 It is a structural schematic diagram of a conversion sleeve of an oil inlet pressure relief device of a high-pressure oil pump of the utility model;

[0028] Figure 4 This is a schematic structural diagram of region A of an oil inlet pressure relief device for a high-pressure oil pump according to the utility model.

[0029] In the figure: 1. pressure relief valve assembly; 2. first oil return pipe; 3. adapter pipe; 4. second oil return pipe; 5. adapter sleeve; 6. oil inlet hole; 7. internal thread; 8. bolt; 9. connecting plate; 10. filter element; 11. spring; 12. valve core; 13. sealing gasket. DETAILED DESCRIPTION

[0030] See also Figure 1-4The utility model provides a technical solution: a high-pressure oil pump oil inlet pressure relief device, including a pressure relief valve assembly 1, an oil inlet hole 6 is opened on the front wall of the pressure relief valve assembly 1, a transfer sleeve 5 is threadedly connected to the bottom end of the pressure relief valve assembly 1, a filter element 10 is installed inside the transfer sleeve 5, a transfer tube 3 is fixedly connected to the bottom end of the transfer sleeve 5, a second oil return pipe 4 is fixedly connected to one side of the transfer tube 3, a first oil return pipe 2 is fixedly connected to the side of the transfer tube 3 away from the second oil return pipe 4, the first oil return pipe 2 is inserted into the reflux hole of the pressure relief valve assembly 1, a spring 11 is fixedly connected to the inside of the pressure relief valve assembly 1, and a valve core 12 is fixedly connected to one end of the spring 11.

[0031] In the technical solution of the utility model, if Figure 3 As shown, the inner wall of the adapter sleeve 5 is provided with an internal thread 7 that matches the external thread of the pressure relief valve assembly 1 , which is conducive to quick disassembly and assembly between the adapter sleeve 5 and the pressure relief valve assembly 1 .

[0032] In the technical solution of the utility model, if Figure 1 As shown, the pressure relief valve assembly 1 and the adapter sleeve 5 are directly padded with a sealing gasket 13 , which is beneficial to improving the sealing between the pressure relief valve assembly 1 and the adapter sleeve 5 .

[0033] In the technical solution of the utility model, if Figure 4 As shown, a connecting plate 9 is fixedly connected to the top of the filter element 10 , and a bolt 8 is passed through the connecting plate 9 , and the bolt 8 is threadedly connected to the adapter sleeve 5 , which is conducive to the rapid disassembly and assembly of the filter element 10 .

[0034] In the technical solution of the utility model, if Figure 1 As shown, the adapter sleeve 5 is a stainless steel metal sleeve, which is beneficial to improving the strength and toughness of the adapter sleeve 5 and is not prone to deformation.

[0035] In the technical solution of the utility model, if Figure 2 As shown, the two ends of the adapter sleeve 5 are respectively connected to the pressure relief valve assembly 1 and the adapter tube 3, which is beneficial to the circulation of diesel.

[0036] In the technical solution of the utility model, if Figure 3 As shown, the diameter of the filter element 10 is matched with the aperture of the adapter sleeve 5 , which is beneficial to improving the effect of the filter element 10 in filtering impurities.

[0037] In the technical solution of the present utility model, not shown in the figure, the second oil return pipe 4 is connected to the oil tank, which is conducive to the return of diesel fuel to flow back into the interior of the oil tank, avoiding oil waste.

[0038] Working principle: When the engine is started, if the oil inlet pressure is lower than the set pressure value, under the action of the spring 11, the valve core 12 completes the closing of the return hole, so that the pressure relief valve is closed. When the oil inlet pressure is greater than the set pressure value, the spring 15 is compressed, the valve core 12 moves up, and the oil return hole is opened, so that the pressure relief valve is opened. When passing through the pressure relief valve assembly 1, part of the oil enters the high-pressure oil pump through the oil inlet hole 6, and the other part enters the interior of the adapter tube 3 through the first oil return pipe 2, and returns to the oil tank through the second oil return pipe 4. When replacing the filter element 10, you only need to unscrew the adapter sleeve 5 from the pressure relief valve assembly 1, and the filter element 10 can be quickly disassembled and replaced, which is convenient and practical. The filter element 10 can filter impurities in the oil, thereby increasing the service life of the pressure relief valve assembly 1.

[0039] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-pressure oil pump oil inlet pressure relief device, characterized in that: The invention comprises a pressure relief valve assembly (1), wherein the front wall of the pressure relief valve assembly (1) is provided with an oil inlet hole (6), the bottom end of the pressure relief valve assembly (1) is threadedly connected to an adapter sleeve (5), a filter element (10) is installed inside the adapter sleeve (5), the bottom end of the adapter sleeve (5) is fixedly connected to an adapter tube (3), one side of the adapter tube (3) is fixedly connected to a second oil return pipe (4), the side of the adapter tube (3) away from the second oil return pipe (4) is fixedly connected to a first oil return pipe (2), the first oil return pipe (2) is inserted into the return hole of the pressure relief valve assembly (1), the inside of the pressure relief valve assembly (1) is fixedly connected to a spring (11), and one end of the spring (11) is fixedly connected to a valve core (12).

2. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The inner wall of the adapter sleeve (5) is provided with an internal thread (7) that matches the external thread of the pressure relief valve assembly (1).

3. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The pressure relief valve assembly (1) and the adapter sleeve (5) are directly padded with a sealing gasket (13).

4. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The top end of the filter element (10) is fixedly connected to a connecting plate (9), a bolt (8) is passed through the connecting plate (9), and the bolt (8) is threadedly connected to the adapter sleeve (5).

5. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The adapter sleeve (5) is a stainless steel metal sleeve.

6. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The two ends of the adapter sleeve (5) are respectively connected to the pressure relief valve assembly (1) and the adapter tube (3).

7. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The diameter of the filter element (10) is matched to the aperture of the adapter sleeve (5).

8. The high-pressure oil pump oil inlet pressure relief device according to claim 1, characterized in that: The second oil return pipe (4) is connected to the oil tank.

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