A diesel filter with oil return boost and oil intake vent

Abstract

The application discloses a diesel filter with oil return pressurization and oil inlet exhaust, which comprises a filter seat and a filter tank, wherein the filter tank is installed 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, 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 a pressurization structure is installed on the oil return channel. The application has the advantages of novel structure, reduced oil injection pump oil return resistance, improved fuel system stability and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel filter, in particular to a diesel filter with back oil pressurization and oil inlet exhaust. BACKGROUND

[0002] In the diesel filter system of diesel commercial vehicles, a diesel filter is generally configured at the rear end of the oil pump. The diesel filter is generally composed of a filter seat and a filter tank. 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. Diesel enters from the oil inlet channel, flows to the filter element, and during the process of passing through the filter paper, impurities are intercepted by the filter paper. Clean diesel then flows to the engine through the oil outlet channel.

[0003] The engine fuel system generally has an oil inlet channel and a back oil channel. The exhaust of the oil inlet channel and the pressure reduction resistance of the back oil channel are problems in the industry. Poor exhaust affects the starting ability of the engine. High back oil pressure resistance affects the stability of the engine fuel pressure.

[0004] The existing patent document CN106050493B discloses a fuel filter seat which integrates the centralized back oil function of the fuel distributor on the filter seat, and only sets one fuel inlet and one fuel outlet, thereby saving installation space, making the whole machine compact and beautiful, and eliminating multiple parts related to the fuel distributor, reducing manufacturing, procurement and inventory management costs, and accelerating production rhythm.

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

[0006] The disclosure of the above background art is only used to assist in understanding the concept and technical solutions of the present application, and does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0007] The present application aims to provide a diesel filter with back oil pressurization and oil inlet exhaust, which has a novel structure, can reduce the back oil resistance of the fuel pump, and improve the stability of the fuel system.

[0008] To this end, the present application provides a diesel filter with back oil pressurization and oil inlet exhaust.

[0009] Preferably, the present application can also have the following technical features:

[0010] The diesel filter with oil return booster and oil inlet exhaust includes a filter seat, a filter tank, an oil inlet channel, an oil outlet channel and an oil return channel, wherein the oil inlet channel is connected with the oil inlet of the filter tank, the oil outlet of the filter tank is connected with the oil outlet channel, and the oil return channel is connected with the fuel injection pump.

[0011] Further, the booster structure includes a driving turbine and a driven turbine, the driving turbine and the driven turbine are linked, and the driving turbine is installed in the oil inlet channel, and the driven turbine is installed in the oil return channel.

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

[0013] Further, the driven shaft of the driven turbine and the driving shaft of the driving turbine are linked by a concave-convex tenon joint; the top of the oil inlet channel is provided with an assembly hole, and the driven shaft and the driving shaft are engaged in the assembly hole.

[0014] Further, it further includes a first sealing gasket installed between the driven turbine and the oil inlet channel.

[0015] Further, the driving turbine is located between the oil inlet of the filter tank and the oil inlet end of the oil inlet channel; the inner cavity of the middle part of the oil inlet channel is provided with an enlarged hole for assembling the driving turbine; wherein the upper end of the enlarged hole is communicated with the assembly hole, and the lower end of the enlarged hole penetrates the lower side wall of the oil inlet channel and is communicated with the top of the filter tank; the lower end of the enlarged hole is provided with a sealing gasket.

[0016] Further, it further includes an overflow valve assembly, the overflow valve assembly includes a valve rod, a valve ball, a spring and an exhaust hole, and a connecting hole is provided through the axial direction of the driving turbine and the driven turbine; the valve rod is fitted in the connecting hole, the lower end of the valve rod is screwed with the sealing gasket, the upper end of the valve rod is provided with a head, and the head is provided with a stepped hole with a large upper end and a small lower end in the axial direction; the upper end of the stepped hole is provided with a screw plug, the lower end of the stepped hole is communicated with the top of the filter tank, and the spring and the valve ball are assembled in the stepped hole; one end of the spring abuts against the screw plug, and the other end of the spring abuts against the valve ball; the large hole end of the stepped hole is further provided with the exhaust hole.

[0017] Further, a second sealing gasket is further included; the second sealing gasket is installed between the valve rod head and the driven scroll.

[0018] Further, a sliding bearing is further included; the sliding bearing is installed inside the connecting hole in a clearance fit, the inner side of the sliding bearing is in a clearance fit with the valve rod, the upper end surface of the sliding bearing is flush with the upper end surface of the driven turbine, and the lower end surface of the sliding bearing is flush with the lower end surface of the driving turbine.

[0019] Further, a first wear-resistant gasket and a second wear-resistant gasket are further included; the first wear-resistant gasket is installed between the turbine blade I and the valve rod head, the lower side of the first wear-resistant gasket is in abutment with the turbine blade I and the upper end surface of the sliding bearing, and the upper side of the first wear-resistant gasket is in abutment with the lower side of the valve rod head; the second wear-resistant gasket is installed between the turbine blade II and the sealing gasket, the lower side of the second wear-resistant gasket is in abutment with the sealing gasket, and the upper side of the second wear-resistant gasket is in abutment with the lower end surface of the turbine blade II.

[0020] The beneficial effects of the present application compared with the prior art include: the pressurized fuel is delivered to the oil inlet channel of the diesel filter seat by the oil pump, the driving turbine is driven to rotate by the fuel flowing into the oil inlet channel at high speed, and then the driven turbine is driven to rotate to generate suction, the fuel upstream of the oil return channel (the oil path connected with the oil injection pump) is sucked to the oil return channel, the oil return of the oil injection pump is more smooth, the oil return pressure is always kept in good condition, and the stability of the fuel system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a perspective view of the present application.

[0022] Fig. 2 is a bottom view of the filter seat of the present application.

[0023] Fig. 3 is a sectional view of the filter seat of the present application.

[0024] Fig. 4 is a perspective view of the pressurization structure of the present application.

[0025] Fig. 5 is a front view of the pressurizer structure of the present application.

[0026] Fig. 6 is a connection schematic diagram of the driving turbine and the driven turbine of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in conjunction with the specific embodiments 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 application and its applications.

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

[0029] like Figs. 1-6 The diesel filter shown includes a filter housing 1 and a filter canister 4. The filter canister 4 is mounted on the filter housing 1. The filter housing 1 also has an inlet channel 3, an outlet channel 2, and a return channel 7. The inlet channel 3 connects to the inlet 31 of the filter canister, and the outlet 42 of the filter canister connects to the outlet channel 2. The return channel 7 connects to a fuel injection pump, and the return fuel from the fuel injection pump flows back to the fuel tank through the return channel 7. It also includes a booster structure 6, which is mounted on the return channel 7. The booster structure 6 includes a drive turbine 68 and a driven turbine 66. The drive turbine 68 and the driven turbine 66 are linked, and the drive turbine 68 is mounted inside the inlet channel 3, while the driven turbine 66 is mounted inside the return channel 7. In this embodiment, pressurized fuel is delivered to the fuel inlet channel 3 of the diesel filter housing via an oil pump. The high-speed flow of fuel into the fuel inlet channel 3 drives the active turbine 68 to rotate, which in turn drives the driven turbine 66 to rotate, generating suction. This suction draws fuel from the upstream 71 of the return channel (the oil passage connecting the return channel 7 and the injection pump) to the downstream 72 of the return channel. This ensures smoother fuel return from the injection pump, maintaining a consistently good return pressure and improving the stability of the fuel system. In the diesel engine fuel system, the pressure requirement of the return channel 7 mainly refers to the pressure requirement at the return port of the injection pump. Excessive pressure will result in high return pressure resistance, affecting 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 inside the driven volute 61, and several turbine blades I662 are evenly distributed around it. The lower end of the driven shaft 661 extends downward toward the oil inlet channel 3. The driving turbine 68 includes turbine blades II682, a driving shaft 681, and a driving volute. The lower end of the driving shaft 681 is installed inside the driving volute, and several turbine blades II682 are evenly distributed around it. Its upper end extends toward the driven turbine 61 and is linked with the driven shaft 661. Preferably, the driving shaft 681 and the driven shaft 661 are connected and transmit steering force through a tenon and mortise joint. For example, the driven shaft 661 has a tenon, and the driving shaft 681 has a corresponding tenon. The driving shaft 681 drives the driven shaft 661 to rotate through the mating connection of the tenon and mortise joint. The oil return channel 7 has an enlarged mounting cavity in the middle, which serves as the driven volute 61. The top of the mounting cavity is open to facilitate the installation of the driven turbine 66.

[0031] The working mode of the driven turbine 66 and the driving turbine 68 in 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 driving turbine 68 to drive the driven turbine 66, so as to form a pumping force at the driven turbine 66 and accelerate the tendency of the medium to move from one side to the other side of the driven turbine 66. For example, in the application in this invention, the oil return channel 7 is divided into an upstream channel 71 and a downstream channel 72, one end of each of the upstream channel 71 and the downstream channel 72 is communicated with the inner cavity of the driven volute 61, and the pumping force generated by the rotation of the driven turbine 66 accelerates the oil on the side of the fuel injection pump to the side of the oil tank, thereby reducing the oil return pressure on the side of the fuel injection pump. Alternatively, it can also be said that the pumping force generated by the driven turbine 66 accelerates the oil in the upstream channel 71 to be delivered to the downstream channel 72.

[0032] A mounting hole 32 is formed at the top of the oil inlet channel 3 as a mounting space for the driving shaft 681 and the driven shaft 661. The lower end of the driven shaft 661 extends into the mounting hole 32, and the upper end of the driving shaft 681 extends into the mounting hole 32 and is connected with the driven shaft 661.

[0033] The driving turbine 68 is located between the filter tank oil inlet 31 and the oil inlet end of the oil inlet channel 3, so that the fuel flushing the driving turbine 68 enters the filter tank 4 through the filter tank oil inlet 31 for filtration. The inner cavity of the middle part of the oil inlet channel 3 is provided with an enlarged hole for mounting the driving turbine 68, and the enlarged hole 43 serves as the driving volute. The upper end of the enlarged hole 43 is communicated with the mounting hole 32, and the lower end penetrates the lower side wall of the oil inlet channel 3 and is communicated with the top space of the filter tank 4. When installing the driving turbine 68, the driving turbine 68 is mounted from the lower end of the enlarged hole 43, and then a sealing gasket 602 is used to seal the lower end of the enlarged hole 43 to prevent the fuel in the oil inlet channel 3 from overflowing. The sealing gasket 602 is in interference fit with the enlarged hole 43. Preferably, a first sealing gasket 62 is also 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 joint between the driven turbine 66 and the oil inlet channel 3. A second sealing gasket 63 is also installed between the valve rod head and the driven volute 61 to seal the joint between the valve rod head and the driven volute 61 and prevent fuel from overflowing.

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

[0035] The filter seat 1 also includes an exhaust structure 5, for example, the exhaust structure 5 is installed on the oil outlet channel 2. The exhaust structure 5 can be the gas passing bolt structure disclosed in the existing patent document CN209444484U. The filter exhaust function is realized.

[0036] Another embodiment of the filter venting function, including the overflow valve assembly, the overflow valve assembly includes a valve stem 642, valve ball 644, spring 646 and vent hole 647, the connecting hole through the main shaft 681 and driven shaft 661, the valve stem 642 is fitted in the connecting hole, the lower end and the gasket screw connection. The valve stem 642 is provided with an axial upper large lower small stepped hole 641, the stepped hole 641 through the valve stem 642, the upper end is provided with a plug 65, the lower end communicates with the top space of the filter tank 4, the inside is also equipped with the spring 646 and the valve ball 644, one end of the spring 646 abuts against the plug 65, the other end abuts against the valve ball 644, the valve ball 644 is pressed on the limiting 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 vent hole 647, the air in the large hole end of the stepped hole 641 can enter the turbine blade I662 area of the driven turbine 66 through the vent hole 647 and then flow to the oil tank through the oil return channel 7. Under normal circumstances, the ball valve 644 is tightly closed to the limiting surface of the stepped hole 641 under the action of the spring 646, at this time, the air in the top of the filter tank 4 cannot enter the large hole end of the stepped hole 641; when the air pressure in the filter tank 4 reaches a certain pressure value, the valve ball 644 can be pushed away, so that the air in 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 vent hole 647, realizing the venting function. The valve stem 642 plays a role in guiding air on one hand, and also plays a role in fixing the driven turbine 66 and the driven turbine 66. Preferably, it also includes a guide block 643, the guide block 643 is slidably installed in the large hole end of the stepped hole 641, the upper part is provided with a boss to connect and position the lower end of the spring 646, and the lower end face is provided with a groove to match the valve ball 644, so that the upper part of the valve ball 644 is in the groove, at the same time, the chamfer processed by the limiting surface of the stepped hole 641 combines the groove to limit the valve ball 644, preventing the valve ball 644 from being offset.

[0037] The top of the filter tank 4 is an air accumulation area, when the air pressure in the accumulation area reaches a preset value, the valve ball 644 is pushed upward, the gas in the air accumulation area enters the stepped hole 641, and then enters the oil return channel 7 through the vent hole 647. Preferably, the plug 65 is a stepped column structure, the small end 651 of which extends into the large hole end of the stepped hole 641 to guide and limit the spring 646, and the large end is provided with external threads and the upper part of the large hole end of the stepped hole 641 is screwed.

[0038] In the above embodiment, the middle part of the driven turbine 66 is provided with a positioning hole, which includes an upper positioning plate 663, a lower positioning plate 666, and turbine blades I 662. The turbine blades I 662 are arranged in a ring shape, and the upper and lower ends thereof are fixed with the upper positioning plate 663 and the lower positioning plate 666, respectively. The upper positioning plate 663 and the lower positioning plate 666 are both provided with a hole in the middle part. The lower positioning plate 666 is fixed on the upper end of the driven shaft 661. Specifically, the upper positioning plate 663 is provided with a boss structure, and an axial hole 665 is formed in the middle part of the boss structure for matching the upper end of the sliding bearing. The outer side of the boss structure is in clearance fit with the driven volute 61.

[0039] Specifically, the upper part of the valve rod 642 is provided with a head 64, and the diameter of the head 64 is larger than that of the valve rod 642. The joint between the valve rod 642 and the head 64 forms a radial limiting surface. The sliding bearing 69 is installed in the connecting hole in clearance fit, and the inner side of the sliding bearing 69 is in clearance fit with the valve rod 642. The upper end surface of the sliding bearing 69 is flush with the upper end surface of the driven turbine 66, and abuts against the lower side of the head 64. The lower end surface of the sliding bearing 69 is flush with the lower end surface of the driving turbine 68, and abuts against the upper side of the sealing gasket 602. The side surface of the sliding bearing 69 is further provided with a second exhaust hole for matching the exhaust hole 647.

[0040] The first wear-resistant gasket 67 and the second wear-resistant gasket 601 are further included. The first wear-resistant gasket 67 is installed between the upper positioning plate 663 and the head 64 of the valve rod, and the lower side of the first wear-resistant gasket 67 abuts against the upper end surface of the upper positioning plate 663 and the sliding bearing 69, and the upper side of the first wear-resistant gasket 67 abuts against the lower side of the head 64 of the valve rod 642. The second wear-resistant gasket 601 is installed between the turbine blade II 682 and the sealing gasket 602, and the lower side of the second wear-resistant gasket 601 abuts against the sealing gasket 602, and the upper side of the second wear-resistant gasket 601 abuts against the lower end surface of the turbine blade II 682. In this embodiment, the first wear-resistant gasket 67 and the second wear-resistant gasket 601 are provided to reduce the rotating resistance of the upper positioning plate 663, the sliding bearing 69, and the turbine blade II 682, and to prevent the head 64 of the valve rod and the sealing gasket 602 from being excessively worn. Specifically, the outer diameter of the first wear-resistant gasket 67 is smaller than the inner diameter of the first sealing gasket 63, and the first wear-resistant gasket 67 is in clearance fit with the first sealing gasket 63.

[0041] In other embodiments, the first wear pad 67 is an open ring structure, and the valve stem 642 has at least one vent hole 647, wherein at least one vent hole 647 is located corresponding to the opening of the first wear pad 67. In this embodiment, no second vent hole is needed on the sliding bearing 69. During venting, air enters the large hole end of the stepped hole 641 from the top of the filter bowl 4, then enters the gap between the sliding bearing 69 and the valve stem 642 through the vent hole 647, or enters the opening 671 of the first wear pad 63, then enters the gap between the driven turbine 66 and the driven volute 61 through the gap between the first wear pad 67 and the first seal pad 63, and enters the oil return passage 7. Alternatively, after entering the opening 671 of the first wear pad 67, air can also enter the oil return passage 7 from the gap between the sliding bearing 69 and the driven turbine 66. When the driven turbine 66 is installed, multiple parts are connected in a clearance fit manner, which not only reduces wear, but also forms a gap through which air can enter the oil return passage 7. Because the gap is too small, fuel is difficult to pass through the gap.

[0042] A method for reducing the oil return resistance of an oil return passage of an oil injector, comprising installing the above-mentioned booster structure 6 on the oil return passage 7, so that the fuel upstream of the oil return passage 7 is accelerated to move downstream to the oil tank. By setting the booster structure to form negative pressure, an attractive force is formed on the fuel upstream of the oil return passage 7, which reduces the oil return resistance and accelerates the passage rate of fuel in the oil return passage.

[0043] Reference Figs. 3-6 A booster structure with venting function, the booster structure comprising a driving turbine 68, a driven turbine 66, a relief valve assembly and a seal pad, the driving turbine 68 and the driven turbine 66 are linked, and the seal pad is arranged on the lower side of the driving turbine. The structure and installation position of the driving turbine 68, the driven turbine 66, the relief valve assembly and the seal pad have been discussed in the above description, and will not be repeated here.

[0044] Those skilled in the art will recognize that numerous modifications can be made to the above description, and that the embodiments and figures are merely illustrative of one or more particular embodiments.

[0045] While there have been described herein the principles of the application in conjunction with specific embodiments thereof, it is to be understood that various modifications which do not depart from the spirit of the application can be made by persons skilled in the art. Also, many modifications can be made to adapt a particular situation to the teachings of the application without departing from the central concept of the application. Therefore, it is contemplated to cover within this application all such modifications that come within the scope of the claims hereinafter set forth.

Claims

1. A diesel filter with oil return pressurization and oil inlet exhaust, comprising a filter base, a filter tank, said filter tank being installed on said filter base, said filter base being further provided with an oil inlet channel, an oil outlet channel and an oil return channel, wherein, The oil inlet channel is communicated with the oil inlet of the filter tank, the oil outlet of the filter tank is communicated with the oil outlet channel, and the oil return channel is connected with the fuel injection pump, characterized in that: a booster structure is further arranged on the oil return channel. The booster structure comprises a driving turbine and a driven turbine, the driving turbine and the driven turbine are linked together, the driving turbine is arranged on the oil inlet channel, and the driven turbine is arranged on the oil return channel. The driven turbine comprises turbine blades I, a driven shaft and a driven volute, the upper end of the driven shaft is arranged in the inner cavity of the driven volute, a plurality of turbine blades I are arranged around the driven shaft, and the lower end of the driven shaft extends into the oil inlet channel; the driving turbine comprises turbine blades II, a driving shaft and a driving volute, the lower end of the driving shaft is arranged in the inner cavity of the driving volute, a plurality of turbine blades II are arranged around the driving shaft, and the upper end of the driving shaft extends into the driven turbine and is linked with the driven shaft. The driven shaft of the driven turbine and the driving shaft of the driving turbine are linked together through a concave-convex tenon joint, the top of the oil inlet channel is provided with an assembly hole, and the driven shaft and the driving shaft are connected in the assembly hole. A first sealing gasket is further arranged between the driven turbine and the oil inlet channel.

2. A diesel filter with oil return boost and oil venting as claimed in claim 1, characterized in that: The driving turbine is arranged between the oil inlet of the filter tank and the oil inlet end of the oil inlet channel, the inner cavity of the middle part of the oil inlet channel is provided with an expansion hole for assembling the driving turbine, the upper end of the expansion hole is communicated with the assembly hole, the lower end of the expansion hole penetrates through the lower side of the oil inlet channel and is communicated with the top of the filter tank, and a sealing gasket is arranged on the lower end of the expansion hole.

3. A diesel filter with oil return boost and oil venting as claimed in claim 2, characterized in that: An overflow valve assembly is further arranged, the overflow valve assembly comprises a valve rod, a valve ball, a spring and an exhaust hole, and a connecting hole is arranged through the axial direction of the driving turbine and the driven turbine; the valve rod is arranged in the connecting hole, the lower end of the valve rod is screwed with the sealing gasket, the upper end of the valve rod is provided with a head, the head is provided with a stepped hole in the axial direction, the upper end of the stepped hole is provided with a screw plug, the lower end of the stepped hole is communicated with the top of the filter tank, the spring and the valve ball are arranged in the stepped hole, one end of the spring is abutted with the screw plug, and the other end of the spring is abutted with the valve ball; the large hole end of the stepped hole is further provided with the exhaust hole.

4. A diesel filter with oil return boost and oil venting as claimed in claim 3, characterized in that: A second sealing gasket is further arranged between the head of the valve rod and the driven volute.

5. A diesel filter with oil return boost and oil venting as defined in claim 3, wherein: A sliding bearing is further arranged, the sliding bearing is arranged in the connecting hole in a clearance fit mode, the inner side of the sliding bearing is clearance fitted with the valve rod, the upper end surface of the sliding bearing is flush with the upper end surface of the driven turbine and is abutted with the lower side of the head, and the lower end surface of the sliding bearing is flush with the lower end surface of the driving turbine and is abutted with the upper side of the sealing gasket; the side surface of the sliding bearing is further provided with a second exhaust hole communicated with the oil return channel.

6. A diesel filter with oil return boost and oil venting as defined in claim 3, wherein: First and second wear-resistant gaskets are further arranged, the first wear-resistant gasket is arranged between the turbine blades I and the head of the valve rod, the lower side of the first wear-resistant gasket is abutted with the turbine blades I and the upper end surface of the sliding bearing, and the upper side of the first wear-resistant gasket is abutted with the lower side of the head of the valve rod; the second wear-resistant gasket is arranged between the turbine blades II and the sealing gasket, the lower side of the second wear-resistant gasket is abutted with the sealing gasket, and the upper side of the second wear-resistant gasket is abutted with the lower end surface of the turbine blades II.

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