Diesel oil filter with oil return pressurization and oil inlet exhaust functions

Abstract

The invention discloses a diesel oil filter with oil return pressurization and oil inlet exhaust, which comprises a filter seat and a filter tank, the filter tank is mounted on the filter seat, the filter seat is further provided with an oil inlet channel, an oil outlet channel and an oil return channel, the oil inlet channel is communicated with an oil inlet of the filter tank, and the oil outlet channel is communicated with an oil outlet of the filter tank. An oil outlet of the filter tank is communicated with the oil outlet channel, the oil return channel is connected with an oil injection pump, and the pressurizing structure is installed on the oil return channel. The invention has the advantages of novel structure, capability of reducing the oil return resistance of the fuel injection pump and improving the stability of a fuel system.

Description

Technical Field

[0001] The invention relates to the technical field of diesel filters, in particular to a diesel filter with oil return pressurization and oil intake and exhaust functions. Background Art

[0002] In the diesel filtration system of diesel commercial vehicles, a diesel filter is usually installed at the rear end of the fuel pump. The diesel filter is generally composed of a filter seat and a filter can. The filter seat is responsible for providing a fuel flow channel, and the filter element is responsible for filtering impurities. In the existing technical solutions, the filter seat generally has an oil inlet channel and an oil outlet channel. The diesel enters from the oil inlet channel and flows to the filter element. When the fuel passes through the filter paper, the impurities are intercepted by the filter paper, and the clean diesel flows through the oil outlet channel to the engine.

[0003] The engine fuel system generally has an oil inlet channel and an oil return channel. The exhaust of the oil inlet channel and the pressure reduction resistance of the oil return channel are difficult problems in the industry. If the exhaust is not done well, the engine's starting ability will be affected; if the oil return pressure resistance is high, the stability of the engine's fuel pressure will be affected.

[0004] Existing patent document CN106050493B discloses a fuel filter seat, which integrates the centralized oil return function of the fuel distributor on the filter seat and only has one fuel inlet and one fuel outlet. It has a compact structure, saves installation space, makes the overall layout compact and beautiful, and eliminates multiple parts related to the fuel distributor, reducing manufacturing, procurement and inventory management costs and speeding up production rhythm.

[0005] Existing patent document CN209444484U discloses a diesel filter structure with self-exhaust, which can automatically exhaust air directly to the air bolt, and the air and fuel flow to the fuel tank through the pipeline, reducing manual operation and reducing fuel waste.

[0006] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0007] The (main) purpose of the present invention is to provide a diesel filter with oil return pressurization and oil intake and exhaust, which has a novel structure and can reduce the oil return resistance of the injection pump and improve the stability of the fuel system.

[0008] To this end, the present invention provides a diesel filter with oil return pressurization and oil intake and exhaust.

[0009] Preferably, the present invention may also have the following technical features:

[0010] A diesel filter with oil return pressurization and oil inlet and exhaust, comprising a filter seat and a filter canister, wherein the filter canister is mounted on the filter seat, and the filter seat is also provided with an oil inlet channel, an oil outlet channel and an oil return channel, wherein the oil inlet channel is connected to the oil inlet of the filter canister, the oil outlet of the filter canister is connected to the oil outlet channel, the oil return channel is connected to a fuel injection pump, and also comprises a pressurization structure, which is mounted on the oil return channel.

[0011] Furthermore, the supercharging structure includes a driving turbine and a driven turbine, the driving turbine and the driven turbine are linked, the driving turbine is installed in the oil inlet passage, and the driven turbine is installed in the oil return passage.

[0012] Furthermore, the driven turbine includes turbine blades I, a driven shaft, and a driven volute. The upper end of the driven shaft is installed in the inner cavity of the driven volute, and a plurality of turbine blades I are evenly distributed around it. The lower end of the driven shaft extends to the oil inlet channel below; the active turbine includes turbine blades II, a driving shaft, and an active volute. The lower end of the driving shaft is installed in the inner cavity of the active volute, and a plurality of turbine blades II are evenly distributed around it. The upper end extends toward the driven turbine and is linked to the driven shaft.

[0013] Furthermore, the driven shaft of the driven turbine and the driving shaft of the driving turbine are connected and linked by means of grooves and tenons; an assembly hole is provided at the top of the oil inlet channel, and the driven shaft and the driving shaft are engaged in the assembly hole.

[0014] Furthermore, it also includes a first sealing gasket, which is installed between the driven turbine and the oil inlet channel.

[0015] Furthermore, the active turbine is located between the oil inlet of the filter tank and the oil inlet end of the oil inlet channel; the inner cavity in the middle of the oil inlet channel is provided with an enlarged hole to assemble the active turbine; wherein the upper end of the enlarged hole is connected to the assembly hole, and the lower end penetrates the lower side pipe wall of the oil inlet channel and is connected to the top of the filter tank; a sealing gasket is installed at the lower end of the enlarged hole.

[0016] Furthermore, it also includes an overflow valve assembly, which includes a valve stem, a valve ball, a spring and an exhaust hole, and is provided with a connecting hole that penetrates the axial direction of the active turbine and the driven turbine; the valve stem is mounted in the connecting hole, and its lower end is threadedly connected to the sealing gasket, and its upper end is provided with a head, and it is also provided with an axial stepped hole that is larger at the top and smaller at the bottom; a screw plug is provided at the upper end of the stepped hole, and the lower end is connected to the top of the filter tank, and the spring and valve ball are also assembled inside the stepped hole; one end of the spring abuts against the screw plug, and the other end abuts against the valve ball; the exhaust hole is also provided at the large hole end of the stepped hole.

[0017] Furthermore, it also includes a second sealing gasket; the second sealing gasket is installed between the valve stem head and the driven volute.

[0018] Furthermore, it also includes a sliding bearing, which is installed inside the connecting hole by means of a clearance fit, and its inner side is clearance-fitted with the valve stem, its upper end face is flush with the upper end face of the driven turbine and abuts against the lower side of the head, and its lower end face is flush with the lower end face of the active turbine and abuts against the upper side of the sealing gasket; a second exhaust hole is also provided on the side of the sliding bearing to connect to the oil return channel.

[0019] Furthermore, it also includes a first wear-resistant gasket and a second wear-resistant gasket, wherein the first wear-resistant gasket is installed between the turbine blade I and the valve stem head, and its lower side abuts against the turbine blade I and the upper end surface of the sliding bearing, and its upper side abuts against the lower side of the valve stem head; the second wear-resistant gasket is installed between the turbine blade II and the sealing gasket, and its lower side abuts against the sealing gasket, and its upper side abuts against the lower end surface of the turbine blade II.

[0020] Compared with the prior art, the beneficial effects of the present invention include: the pressurized fuel is delivered to the oil inlet channel of the diesel filter seat by the oil pump, the fuel flowing into the oil inlet channel at a high speed is used to drive the active turbine to rotate, and then the driven turbine is driven to rotate to generate suction, and the fuel upstream of the return oil channel (the oil circuit connecting the return oil channel and the injection pump) is sucked into the return oil channel, the return oil of the injection pump is smoother, so that the return oil pressure is always kept in a good state, and the stability of the fuel system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective view of the present invention.

[0022] Figure 2 It is a bottom view of the filter seat of the present invention.

[0023] Figure 3 It is a cross-sectional view of the filter seat of the present invention.

[0024] Figure 4 It is a stereoscopic diagram of the supercharging structure of the present invention.

[0025] Figure 5 It is a front view of the supercharger structure of the present invention.

[0026] Figure 6 It is a schematic diagram of the connection between the active turbine and the driven turbine of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0028] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts unless otherwise specifically stated.

[0029] like Figures 1 to 6 The diesel filter with oil return pressurization and oil intake and exhaust shown in the figure comprises a filter seat 1 and a filter canister 4. The filter canister 4 is mounted on the filter seat 1. The filter seat 1 is also provided with an oil inlet channel 3, an oil outlet channel 2 and an oil return channel 7. The oil inlet channel 3 is connected to the oil inlet port 31 of the filter canister, the oil outlet port 42 of the filter canister is connected to the oil outlet channel 2, and the oil return channel 7 is connected to the fuel injection pump. The return oil of the fuel injection pump flows back to the fuel tank through the oil return channel 7. The boosting structure 6 is also included. The boosting structure 6 is mounted on the oil return channel 7. The boosting structure 6 comprises an active turbine 68 and a driven turbine 66. The active turbine 68 and the driven turbine 66 are linked, and the active turbine 68 is mounted inside the oil inlet channel 3, and the driven turbine 66 is mounted inside the oil return channel 7. In this embodiment, the pressurized fuel is delivered to the oil inlet channel 3 of the diesel filter seat by the oil pump, and the fuel flowing into the oil inlet channel 3 at high speed drives the active turbine 68 to rotate, thereby driving the driven turbine 66 to rotate and generate suction, and the fuel in the upstream 71 of the return oil channel (the oil path connecting the return oil channel 7 and the injection pump) is sucked to the downstream 72 of the return oil channel, so that the return oil of the injection pump is smoother, so that the return oil pressure is always kept in a good state, and the stability of the fuel system is improved. In the diesel engine fuel system, the pressure requirement of the return oil channel 7 mainly refers to the pressure requirement at the return oil port of the injection pump, which cannot be too large, and the return oil pressure resistance is high, which affects the stability of the engine fuel pressure. The active turbine 68 and the driven turbine 66 are installed horizontally.

[0030] The driven turbine 66 includes turbine blades I662, a driven shaft 661, and a driven volute 61. The upper end of the driven shaft 661 is installed in the inner cavity of the driven volute 61, and a number of turbine blades I662 are evenly distributed around it. The lower end of the driven shaft 661 extends to the oil inlet channel 3 below. The active turbine 68 includes turbine blades II682, an active shaft 681, and an active volute. The lower end of the active shaft 681 is installed in the inner cavity of the active volute, and a number of turbine blades II682 are evenly distributed around it. The upper end extends to the driven turbine 61 and is linked to the driven shaft 661. Preferably, the active shaft 681 and the driven shaft 661 are connected and transmit steering force in a concave-convex tenon manner. For example, the driven shaft 661 is provided with a convex tenon, and the active shaft 681 is provided with a corresponding concave tenon. The active shaft 681 drives the driven shaft 661 to rotate through the matching connection of the convex tenon and the concave tenon. An enlarged installation cavity is provided in the middle of the oil return passage 7 , and the installation cavity serves as the driven volute 61 , and the top of the installation cavity is open, so as to facilitate the installation of the driven turbine 66 .

[0031] The working mode of the driven turbine 66 and the active turbine 68 of this embodiment is the same as that of the engine supercharger, which is a simplified version of the supercharger structure. Both use the medium to flush the active turbine 68 to drive the driven turbine 66, so as to form a pump suction force at the driven turbine 66, and accelerate the trend of the medium moving from one side of the driven turbine 66 to the other side. For example, in the application of the present invention, the return oil channel 7 is divided into an upstream channel 71 and a downstream channel 72, and one end of the upstream channel 71 and the downstream channel 72 are respectively connected to the inner cavity of the driven volute 61, and the pump suction force generated by the rotation of the driven turbine 66 accelerates the fuel on the injection pump side to the fuel tank side, thereby reducing the return oil pressure on the injection pump side. Alternatively, it can be said that the pump suction force generated by the driven turbine 66 accelerates the fuel in the upstream channel 71 to be transported to the downstream channel 72.

[0032] An assembly hole 32 is provided at the top of the oil inlet passage 3 as an assembly space for the driving shaft 681 and the driven shaft 661. The lower end of the driven shaft 661 extends into the assembly hole 32, and the upper end of the driving shaft 681 extends into the assembly hole 32 and is connected to the driven shaft 661.

[0033] The active turbine 68 is located between the oil inlet 31 of the filter tank and the oil inlet end of the oil inlet channel 3, so that the fuel enters the filter tank 4 through the oil inlet 31 after flushing the active turbine 68. The inner cavity in the middle of the oil inlet channel 3 is provided with an enlarged hole to assemble the active turbine 68, and the enlarged hole 43 serves as the active volute. Among them, the upper end of the enlarged hole 43 is connected with the assembly hole 32, and the lower end penetrates the lower side wall of the oil inlet channel 3 and connects to the top space of the filter tank 4. When installing the active turbine 68, the active turbine 68 is installed from the lower end of the enlarged hole 43, and then the lower end of the enlarged hole 43 is closed with a sealing gasket 602 to prevent the fuel in the oil inlet channel 3 from overflowing. The sealing gasket 602 and the enlarged hole 43 are interference fit. Preferably, it also includes a first sealing gasket 62, which is installed between the driven turbine 66 and the oil inlet channel 3 to prevent the fuel in the oil inlet channel 3 from overflowing at the junction of the driven turbine 66 and the oil inlet channel 3. It also includes a second sealing gasket 63, which is installed between the valve stem head and the driven volute 61 to seal the joint between the valve stem head and the driven volute 61 to prevent fuel from overflowing.

[0034] In the above embodiment, the active turbine 68 drives the driven turbine 66 to rotate, thereby forming a boost pressure in the oil return passage 7, which is beneficial to the oil return of the fuel injection pump and reduces the oil return resistance.

[0035] The filter seat 1 further includes an exhaust structure 5, for example, the exhaust structure 5 is installed in the oil outlet channel 2, and the exhaust structure 5 may be a gas bolt structure disclosed in the existing patent document CN209444484U to realize the filter exhaust function.

[0036] Another embodiment of realizing the exhaust function of the filter includes a relief valve assembly, the relief valve assembly includes a valve stem 642, a valve ball 644, a spring 646 and an exhaust hole 647, the connection hole passes through the driving shaft 681 and the driven shaft 661, the valve stem 642 is mounted in the connection hole, and its lower end is threadedly connected with the sealing gasket. The valve stem 642 is provided with an axial stepped hole 641 that is larger at the top and smaller at the bottom, the stepped hole 641 passes through the valve stem 642, the upper end of the valve stem 642 is provided with a screw plug 65, and the lower end is connected to the top space of the filter tank 4, and the spring 646 and the valve ball 644 are also assembled inside the spring 646, one end of the spring 646 abuts against the screw plug 65, and the other end abuts against the valve ball 644, pressing the valve ball 644 on the limit surface formed by the stepped hole 641, forming a common pressure valve structure. The large hole end of the stepped hole 641 is also provided with the exhaust hole 647. The air at the large hole end of the stepped hole 641 can enter the turbine blade 1662 area of ​​the driven turbine 66 through the exhaust hole 647 and then flow to the fuel tank through the oil return channel 7 with the fuel. Under normal conditions, the ball valve 644 is pressed against the limit surface of the stepped hole 641 by the elastic force of the spring 646, and the small hole of the stepped hole 641 is sealed. At this time, the air at the top of the filter tank 4 cannot enter the large hole end of the stepped hole 641; when the air pressure inside the filter tank 4 reaches a certain pressure value, the valve ball 644 can be pushed open, so that the air inside the filter tank 4 can enter the large hole end of the stepped hole 641, and then enter the oil return channel 7 through the exhaust hole 647 to achieve the exhaust function. The valve stem 642 plays the role of guiding air on the one hand, and also plays the role of fixing the active turbine 68 and the driven turbine 66 on the other hand. Preferably, it also includes a guide block 643, which is slidably installed on the large hole end of the stepped hole 641, and a boss is provided on the upper part of the guide block 643 to connect and position the lower end of the spring 646, and a groove is provided on the lower end surface to match the valve ball 644, so that the upper part of the valve ball 644 is in the groove, and at the same time, the chamfer processed on the limiting surface of the stepped hole 641 is combined with the groove to limit the valve ball 644 to prevent the valve ball 644 from being displaced by force.

[0037] The top of the filter tank 4 is an air gathering area. When the air pressure in the gathering area reaches a preset value, the valve ball 644 is pushed upward, and the gas in the air gathering area enters the stepped hole 641, and then enters the oil return channel 7 through the exhaust hole 647. Preferably, the screw plug 65 is a stepped column structure, and its small end 651 extends into the large hole end of the stepped hole 641 to form a guide limit for the spring 646. The large end is provided with an external thread and is threadedly connected to the upper part of the large hole end of the stepped hole 641.

[0038] In the above, one embodiment of the driven turbine 66 is that a clearance hole is formed in the middle of the driven turbine 66, which includes an upper positioning piece 663, a lower positioning piece 666, and a turbine blade 1662. A plurality of turbine blades 1662 are arranged in a ring shape, and the upper and lower ends thereof are respectively fixed with the upper positioning piece 663 and the lower positioning piece 666. The upper positioning piece 663 and the lower positioning piece 666 are both sheet structures with a hole in the middle, and the lower positioning piece 666 is fixed to the upper end of the driven shaft 661. Specifically, the upper positioning piece 663 is a boss structure, and an axial through hole 665 is provided in the middle to penetrate it, which is used to match the upper end of the sliding bearing, and its outer side is in clearance with the driven volute 61.

[0039] Specifically, the upper part of the valve stem 642 is provided with a head 64, and the diameter of the head 64 is larger than the diameter of the body of the valve stem 642, so that the joint of the valve stem 642 and the head 64 forms a radial limit surface. It also includes a sliding bearing 69, which is installed inside the connecting hole by a clearance fit, and its inner side is clearance fit with the valve stem 642, its upper end surface is flush with the upper end surface of the driven turbine 66, and abuts with the lower side of the head 64, and its lower end surface is flush with the lower end surface of the active turbine 68, and abuts with the upper side of the sealing gasket 602. The side of the sliding bearing 69 is also provided with a second exhaust hole, which cooperates with the exhaust hole 647 for exhaust. When the filter is exhausted, the air enters the gap between the sliding bearing 69 and the valve stem 642 through the exhaust hole 647, and then enters the turbine blade I662 area through the second exhaust hole. The upper and lower end surfaces of the sliding bearing 69 can also play a sealing role to prevent the fuel from contacting the outer side of the valve stem 642.

[0040] It also includes a first wear-resistant gasket 67 and a second wear-resistant gasket 601, wherein the first wear-resistant gasket 67 is installed between the upper positioning plate 663 and the valve stem head 64, and its lower side abuts against the upper end surface of the upper positioning plate 663 and the sliding bearing 69, and its upper side abuts against the lower side of the head 64 of the valve stem 642. The second wear-resistant gasket 601 is installed between the turbine blade II682 and the sealing gasket 602, and its lower side abuts against the sealing gasket 602, and its upper side abuts against the lower end surface of the turbine blade II682. In this embodiment, by arranging the first wear-resistant gasket 67 and the second wear-resistant gasket 601, the rotation resistance of the upper positioning plate 663, the sliding bearing 69, and the turbine blade II682 is reduced, and the valve stem head 64 and the sealing gasket 602 can also be prevented from being excessively worn. Specifically, the outer diameter of the first wear-resistant plate 67 is smaller than the inner diameter of the first sealing gasket 63, and the two are clearance-matched.

[0041] In other embodiments, the first wear-resistant gasket 67 is an open ring structure, and at least one exhaust hole 647 is provided on the valve stem 642, wherein at least one exhaust hole 647 is provided at a position corresponding to the opening of the first wear-resistant plate 67. In this embodiment, it is not necessary to provide a second exhaust hole on the sliding bearing 69. When exhausting, the air enters the large hole end of the stepped hole 641 from the top of the filter tank 4, and then enters the gap between the sliding bearing 69 and the valve stem 642 or the opening 671 of the first wear-resistant gasket 63 through the exhaust hole 647, and then enters the gap between the driven turbine 66 and the driven volute 61 through the gap between the first wear-resistant gasket 67 and the first sealing gasket 63, and enters the oil return channel 7. Alternatively, after entering the opening 671 of the first wear-resistant gasket 67, the air can also enter the oil return channel 7 from the gap between the sliding bearing 69 and the driven turbine 66. When installing the driven turbine 66, multiple parts are connected by clearance fit, which not only reduces wear, but also the formed gap can serve as a path for the exhaust air to enter the oil return channel 7. Moreover, since the gap is too small, it is difficult for fuel to pass through the gap.

[0042] A method for reducing the oil return resistance of an injector oil return channel includes installing the above-mentioned boost structure 6 on the oil return channel 7, so that the fuel upstream of the oil return channel 7 is accelerated to move to the downstream fuel tank. By setting the boost structure to form a negative pressure, a suction force is formed on the fuel upstream of the oil return channel 7, reducing the oil return resistance and accelerating the passing rate of the fuel in the oil return channel.

[0043] Reference Figure 3-6 A supercharging structure with exhaust function, the supercharging structure includes an active turbine 68, a driven turbine 66, a relief valve assembly and a sealing gasket, the active turbine 68 and the driven turbine 66 are linked, and the sealing gasket is arranged at the lower side of the active turbine. The structures and installation positions of the active turbine 68, the driven turbine 66, the relief valve assembly and the sealing gasket have been discussed above, and will not be repeated in this embodiment.

[0044] Those skilled in the art will appreciate that numerous variations to the above description are possible, and that the examples and figures are intended only to describe one or more specific implementations.

[0045] Although what is considered as exemplary embodiments of the present invention has been described and described, it will be understood by those skilled in the art that various changes and substitutions may be made thereto without departing from the spirit of the present invention. In addition, many modifications may be made to adapt specific situations to the teachings of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but the present invention may also include all embodiments and their equivalents that fall within the scope of the present invention.

Claims

1. A diesel filter with oil return pressurization and oil inlet and exhaust, comprising a filter seat and a filter canister, wherein the filter canister is mounted on the filter seat, and the filter seat is also provided with an oil inlet channel, an oil outlet channel and an oil return channel, wherein: The oil inlet passage is connected to the oil inlet of the filter tank, the oil outlet of the filter tank is connected to the oil outlet passage, and the oil return passage is connected to the fuel injection pump. It is characterized in that it also includes a boost structure, and the boost structure is installed in the oil return passage.

2. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 1, characterized in that: The supercharging structure comprises a driving turbine and a driven turbine, the driving turbine and the driven turbine are linked, the driving turbine is installed in the oil inlet passage, and the driven turbine is installed in the oil return passage.

3. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 2, characterized in that: The driven turbine includes turbine blades I, a driven shaft, and a driven volute. The upper end of the driven shaft is installed in the inner cavity of the driven volute, and a plurality of turbine blades I are evenly distributed around it. The lower end of the driven shaft extends to the oil inlet channel below. The active turbine includes turbine blades II, a driving shaft, and an active volute. The lower end of the driving shaft is installed in the inner cavity of the active volute, and a plurality of turbine blades II are evenly distributed around it. The upper end of the driving shaft extends toward the driven turbine and is linked to the driven shaft.

4. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 3, characterized in that: The driven shaft of the driven turbine and the driving shaft of the driving turbine are connected and linked by means of concave and convex tenons; an assembly hole is opened on the top of the oil inlet channel, and the driven shaft and the driving shaft are engaged in the assembly hole.

5. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 3, characterized in that: The invention also includes a first sealing gasket installed between the driven turbine and the oil inlet passage.

6. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 3, characterized in that: The active turbine is located between the oil inlet of the filter tank and the oil inlet end of the oil inlet channel; an enlarged hole is provided in the inner cavity in the middle of the oil inlet channel to assemble the active turbine; wherein the upper end of the enlarged hole is connected to the assembly hole, and the lower end penetrates the lower side wall of the oil inlet channel and is connected to the top of the filter tank; a sealing gasket is installed at the lower end of the enlarged hole.

7. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 6, characterized in that: It also includes an overflow valve assembly, which includes a valve stem, a valve ball, a spring and an exhaust hole, and is provided with a connecting hole that runs axially through the active turbine and the driven turbine; the valve stem is mounted in the connecting hole, and its lower end is threadedly connected to the sealing gasket, and its upper end is provided with a head, and it is also provided with an axial stepped hole that is larger at the top and smaller at the bottom; a screw plug is provided at the upper end of the stepped hole, and its lower end is connected to the top of the filter tank, and the spring and valve ball are also assembled inside the stepped hole; one end of the spring abuts against the screw plug, and the other end abuts against the valve ball; the exhaust hole is also provided at the large hole end of the stepped hole.

8. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 7, characterized in that: It also includes a second sealing gasket; the second sealing gasket is installed between the valve stem head and the driven volute.

9. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 7, characterized in that: It also includes a sliding bearing, which is installed inside the connecting hole by means of a clearance fit, and its inner side is clearance-fitted with the valve stem, its upper end face is flush with the upper end face of the driven turbine and abuts against the lower side of the head, and its lower end face is flush with the lower end face of the active turbine and abuts against the upper side of the sealing gasket; a second exhaust hole is also provided on the side of the sliding bearing to connect to the oil return channel.

10. A diesel filter with oil return pressurization and oil intake and exhaust as claimed in claim 7, characterized in that: It also includes a first wear-resistant gasket and a second wear-resistant gasket, wherein the first wear-resistant gasket is installed between the turbine blade I and the valve stem head, with its lower side abutting against the turbine blade I and the upper end surface of the sliding bearing, and its upper side abutting against the lower side of the valve stem head; the second wear-resistant gasket is installed between the turbine blade II and the sealing gasket, with its lower side abutting against the sealing gasket, and its upper side abutting against the lower end surface of the turbine blade II.

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