Fuel pressure release valve with filter element

Abstract

The utility model provides a fuel pressure relief valve with a filter element, which comprises a shell and a check block arranged in the shell, the check block divides the interior of the shell into a first inner cavity and a second inner cavity, and a cover plate and a valve element part are arranged at the first inner cavity of the shell. According to the fuel pressure release valve, when the oil inlet pressure is below the limit value, fuel firstly enters the second inner cavity and then enters the filter element piece, after being filtered by the filter element piece, the fuel enters an engine high-pressure oil injection pump from the oil outlet hole, and the oil injection pump injects high-pressure oil into an air cylinder for combustion; when the oil inlet pressure is larger than the limit value, fuel oil pushes the valve element part to move in the direction close to the cover plate after passing through the filter element part, meanwhile, the spring is compressed, the fuel oil flows into the first inner cavity at the moment and then flows to the oil return pipe through the oil return hole, pressure relief is achieved, the situation that the pressure in an oil supply system is too large is avoided, and therefore the fuel oil pressure relief valve can control the pressure of the oil supply system and improve the oil supply efficiency. And the fuel oil can be subjected to secondary filtration, so that the function of a fine filter is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief valves, in particular to a fuel pressure relief valve with a filter element. Background Art

[0002] The fuel supply pressure relief valve is one of the common components of the automobile fuel supply system. It is a component that ensures the normal fuel pressure in the automobile oil circuit. If the pressure in the fuel system exceeds the set value, the pressure relief valve will automatically open to release the excess pressure. This helps to avoid damage to the components in the fuel system and ensure the normal operation of the fuel pump and other related components. Another important function of the pressure relief valve is to keep the pressure in the fuel system stable to ensure that the fuel pump can work normally and deliver fuel.

[0003] On the other hand, since there are three precision parts in the diesel engine fuel supply system, the cleanliness of diesel is required to be high. In order to improve the filtering efficiency, the diesel filter generally has two or more stages, which are divided into diesel coarse and fine filters, which are installed between the diesel tank and the fuel pump, and between the fuel pump and the injection pump. The coarse filter has a larger aperture and can filter most diesel impurities. The fine filter has a very small aperture and can further improve the cleanliness of the fuel. The pressure relief valve and the diesel filter (fine filter part) are generally two different components, which are assembled separately. This not only increases the assembly process, but also the large number of parts is not conducive to cost control. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a fuel pressure relief valve with a filter element which has a filtering function and is conducive to controlling production costs.

[0005] The utility model provides the following technical solutions: a fuel pressure relief valve with a filter element, comprising an outer shell, a block arranged inside the outer shell, the block dividing the interior of the outer shell into a first inner cavity and a second inner cavity, a cover plate and a valve core member are arranged at the first inner cavity of the outer shell, an elastic member is arranged between the cover plate and the valve core member, the valve core member abuts against one side of the block, a filter element member and a first groove are arranged at the second inner cavity of the outer shell, a retaining spring is arranged at the first groove, the filter element member is restricted in the second inner cavity by the retaining spring, the outer shell is provided with a plurality of oil outlet holes and a plurality of oil return holes, the oil outlet holes are communicated with the second inner cavity, and the oil return holes are communicated with the first inner cavity.

[0006] Furthermore, the housing includes a connecting portion and a hexagonal portion, the oil outlet hole and the oil return hole are arranged at the connecting portion, and the connecting portion is provided with threads.

[0007] Furthermore, the valve core component includes a valve core body, a cavity is arranged inside the valve core body, a first through hole is arranged on the valve core body, the first through hole is communicated with the cavity, and a part of the elastic component is located in the cavity.

[0008] Furthermore, the valve core body is provided with a second groove, the second groove is annular, and the second groove is communicated with the first through hole.

[0009] Furthermore, the filter element comprises a filter element body, a plurality of mounting holes are arranged around the circumference of the filter element body, a filter screen is arranged in the mounting hole, a second through hole is opened in the middle of the filter element body, and the second through hole is connected to the mounting hole.

[0010] Furthermore, the elastic member is a spring, one end of which is in contact with the cover plate, and the other end of which is located in the cavity of the valve core body and in contact with the interior of the valve core body.

[0011] Furthermore, the filter screen is a stainless steel filter screen with a wire diameter of 0.04 mm and a hole spacing of 0.07 mm.

[0012] The beneficial effects of the utility model are as follows: when the oil inlet pressure is below the limit value, the fuel first enters the second inner cavity and then enters the filter element, and after being filtered by the filter element, enters the engine's high-pressure fuel injection pump from the oil outlet, and the fuel injection pump sprays the high-pressure oil into the cylinder for combustion; when the oil inlet pressure is greater than the limit value, the fuel will push the valve core element to move toward the cover plate after passing through the filter element, and the spring will be compressed at the same time. At this time, the fuel will flow into the first inner cavity, and then flow to the oil return pipe through the oil return hole to achieve pressure relief and avoid excessive pressure in the fuel supply system. Therefore, the fuel pressure relief valve can not only control the pressure of the fuel supply system, but also perform secondary filtration of the fuel to achieve the function of a fine filter, and also reduce the number of parts of the fuel inlet system, which is beneficial to controlling production costs. In addition, through the integrated design of the fuel filter element and the pressure relief valve, the number of parts is reduced, the overall cost is compressed, and the space for parts layout is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the internal three-dimensional structure of the shell of the utility model.

[0015] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the shell of the utility model.

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the valve core component of the utility model.

[0017] Figure 5It is a three-dimensional structural schematic diagram of the filter element of the utility model.

[0018] Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the filter element of the utility model.

[0019] The marks in the accompanying drawings are: 1-housing, 11-connecting part, 12-hexagonal part, 13-thread, 14-oil outlet hole, 15-oil return hole, 16-stopper, 17-first inner cavity, 18-second inner cavity, 19-first groove, 2-cover plate, 3-spring, 4-valve core part, 41-valve core body, 42-first through hole, 43-second groove, 44-cavity, 5-filter element part, 51-filter element body, 52-mounting hole, 53-filter screen, 54-second through hole, 6-circlip. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] A fuel pressure relief valve with a filter element is installed between the fuel delivery pump and the fuel injection pump. The fuel pressure relief valve has a pressure relief pressure of 7±1Kpa. Figure 1-Figure 3 As shown, the fuel pressure relief valve includes a housing 1, a cover plate 2, an elastic member, a valve core member 4, a filter element member 5 and a retaining spring 6;

[0024] Among them, the cover plate 2, the elastic member, the valve core member 4, the filter element 5 and the retaining spring 6 are all arranged on the inner side of the shell 1, and a stopper 16 is arranged inside the shell 1. The stopper 16 is in a circular ring shape. The stopper 16 and the shell 1 are integrally formed. The stopper 16 divides the inside of the shell 1 into a first inner cavity 17 and a second inner cavity 18. The first inner cavity 17 and the second inner cavity 18 are in a connected state. The inner diameters of the first inner cavity 17 and the second inner cavity 18 are 9 mm. The first inner cavity 17 of the shell 1 is provided with a cover plate 2 near the outer side. The cover plate 2 is welded or threaded or clamped. At the first inner cavity 17 of the housing 1, the valve core member 4 is also arranged in the first inner cavity 17, and an elastic member is arranged between the cover plate 2 and the valve core member 4. The elastic member is a spring 3, one end of the spring 3 contacts the cover plate 2, and the other end is located in the cavity 44 of the valve core body 41 and contacts the inside of the valve core body 41. The spring 3 is used to provide an extrusion force to the valve core member 4, so that one side of the valve core member 4 abuts against one side of the stopper 16. When the valve core member 4 abuts against one side of the stopper 16, the first inner cavity 17 and the second inner cavity 18 are in a blocked state. When the oil inlet pressure is large, the valve core member 4 is in a blocked state. When the limit value is reached, the fuel will push the valve core 4 to move, and the spring 3 will be compressed. At this time, the fuel will flow into the first inner cavity 17 and flow to the oil return pipe through the oil return hole 15 to achieve pressure relief and avoid excessive pressure in the oil supply system. The second inner cavity 18 of the housing 1 is provided with a filter element 5 and a first groove 19. The filter element 5 is used to filter the fuel. The first groove 19 is used to install the retaining spring 6. The filter element 5 is limited in the second inner cavity 18 by the retaining spring 6, and by removing the retaining spring 6 from the first groove 19, the retaining spring 6 can no longer affect the filter element 5. The filter element 5 can be taken out from the second inner cavity 18 for maintenance or replacement. The outer shell 1 is provided with a plurality of oil outlet holes 14 and a plurality of oil return holes 15. In the present embodiment, the number of the oil outlet holes 14 and the oil return holes 15 are both two, and the two oil outlet holes 14 are symmetrically arranged, and the two oil return holes 15 are also symmetrically arranged. The oil outlet hole 14 is connected to the oil inlet pipe of the engine high-pressure fuel injection pump, and the oil return hole 15 is connected to the oil return pipe of the oil return system. The oil outlet hole 14 is communicated with the second inner cavity 18, and the oil return hole 15 is communicated with the first inner cavity 17.

[0025] It can be understood that when the oil inlet pressure is below the limit, the fuel first enters the second inner cavity 18 and then enters the filter element 5. After being filtered by the filter element 5, the fuel enters the engine high-pressure fuel injection pump from the oil outlet 14, and the fuel injection pump sprays the high-pressure oil into the cylinder for combustion; when the oil inlet pressure is greater than the limit, the fuel will push the valve core 4 to move towards the cover plate 2 after passing through the filter element 5, and the spring 3 is compressed at the same time. At this time, the fuel will flow into the first inner cavity 17, and then flow to the return oil pipe through the return oil hole 15 to achieve pressure relief and avoid excessive pressure in the fuel supply system. Therefore, the fuel pressure relief valve can not only control the pressure of the fuel supply system, but also perform secondary filtration of the fuel to realize the function of a fine filter, and also reduce the number of parts of the fuel inlet system, which is beneficial to control production costs. In addition, the integrated design of the fuel filter element 5 and the pressure relief valve reduces the number of parts, reduces the overall cost, and saves space for parts layout.

[0026] The housing 1 comprises a connecting portion 11 and a hexagonal portion 12 . An oil outlet hole 14 and an oil return hole 15 are arranged at the connecting portion 11 . A thread 13 is formed on the connecting portion 11 .

[0027] Among them, the connecting part 11 is cylindrical in shape, and the hexagonal part 12 is integrally formed with the connecting part 11. By opening a thread 13 on the connecting part 11, it is convenient to connect the connecting part 11 with the oil inlet pipe through the thread 13. The function of the hexagonal part 12 is to facilitate the operator to remove the pressure relief valve from the oil inlet pipe or install the pressure relief valve on the oil inlet pipe by using tools such as a wrench.

[0028] like Figure 4 As shown, the valve core component 4 includes a valve core body 41, a cavity 44 is arranged inside the valve core body 41, a first through hole 42 is arranged on the valve core body 41, the first through hole 42 is connected to the cavity 44, a part of the elastic component is located in the cavity 44, and the valve core body 41 is provided with a second groove 43, the second groove 43 is annular, and the second groove 43 is connected to the first through hole 42.

[0029] Among them, the valve core body 41 is fitted with the inner wall of the first inner cavity 17 of the outer shell 1, and the first through hole 42 is used to allow a small amount of oil to enter the first inner cavity 17, so that the pressure in the first inner cavity 17 is equal to the return oil circuit pressure of the oil return system, and the second groove 43 is used to facilitate the installation of the valve core component 4. That is to say, when the valve core component 4 is installed, the first through hole 42 on the valve core component 4 is not aligned with the oil return hole 15. Through the second groove 43, oil can also enter the first inner cavity 17 through the first through hole 42, so that the pressure in the first inner cavity 17 is equal to the return oil circuit pressure of the oil return system.

[0030] like Figure 5 and Figure 6As shown, the filter element 5 includes a filter body 51 , a plurality of mounting holes 52 are arranged around the filter body 51 , a filter screen 53 is arranged in the mounting hole 52 , and a second through hole 54 is opened in the middle of the filter body 51 , and the second through hole 54 is connected to the mounting hole 52 .

[0031] The filter screen 53 is a stainless steel filter screen 53 with a wire diameter of 0.04 mm, a hole pitch of 0.07 mm, and a diameter of 5.7 mm. The filter screen 53 is used to filter the fuel, and the filter element body 51 fits the second inner cavity 18 .

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fuel pressure relief valve with a filter element, characterized in that: It includes an outer shell, a block arranged inside the outer shell, the block divides the interior of the outer shell into a first inner cavity and a second inner cavity, a cover plate and a valve core member are arranged at the first inner cavity of the outer shell, an elastic member is arranged between the cover plate and the valve core member, the valve core member abuts against one side of the block, a filter element member and a first groove are arranged at the second inner cavity of the outer shell, a retaining spring is arranged at the first groove, and the filter element member is restricted in the second inner cavity by the retaining spring, the outer shell is provided with a plurality of oil outlet holes and a plurality of oil return holes, the oil outlet holes are communicated with the second inner cavity, and the oil return holes are communicated with the first inner cavity.

2. The fuel pressure relief valve according to claim 1, characterized in that: The housing comprises a connecting portion and a hexagonal portion, the oil outlet hole and the oil return hole are arranged at the connecting portion, and a thread is formed on the connecting portion.

3. The fuel pressure relief valve according to claim 1, characterized in that: The valve core member comprises a valve core body, a cavity is arranged inside the valve core body, a first through hole is arranged on the valve core body, the first through hole is communicated with the cavity, and a part of the elastic member is located in the cavity.

4. The fuel pressure relief valve according to claim 3, characterized in that: The valve core body is provided with a second groove, the second groove is annular, and the second groove is communicated with the first through hole.

5. The fuel pressure relief valve according to claim 1, characterized in that: The filter element comprises a filter element body, a plurality of mounting holes are arranged around the circumference of the filter element body, a filter screen is arranged in the mounting hole, a second through hole is opened in the middle of the filter element body, and the second through hole is communicated with the mounting hole.

6. The fuel pressure relief valve according to claim 3, characterized in that: The elastic member is a spring, one end of which is in contact with the cover plate, and the other end of which is located in the cavity of the valve core body and in contact with the interior of the valve core body.

7. The fuel pressure relief valve according to claim 5, characterized in that: The filter screen is a stainless steel filter screen with a wire diameter of 0.04 mm and a hole spacing of 0.07 mm.

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