CN210440142U

CN210440142U - Intelligent heat recycling end cover and filter

Info

Publication number: CN210440142U
Application number: CN201921454909.9U
Authority: CN
Inventors: 陈绍英; 陆家祥; 程勇
Original assignee: Rizhao Anrui Mechanical And Electrical Technology Co Ltd
Current assignee: Zibo Shengdingrui Electrical Technology Co ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-01
Anticipated expiration: 2029-09-03

Abstract

The utility model relates to the technical field of filters, in particular to a filter, which comprises a filter vat, a filter element assembly and an intelligent heat recycling end cover, wherein the filter element assembly is arranged inside the filter vat; the cold oil inlet channel is communicated with the mixing channel, the hot oil inlet channel is communicated with the hot oil outlet channel, a valve port is arranged between the hot oil inlet channel and the mixing channel, and the thermal power valve is used for opening or closing the valve port; an output channel is arranged on the filter barrel, and the bottom of the filter element assembly is communicated with the output channel. The utility model discloses can prevent to contain micro-bubble in the oil of filter output, guarantee that the engine fuel supplies with enough, solve because of containing the engine fuel that the microbubble leads to in the output fuel supply not enough, decay power or engine work symptoms such as unstability.

Description

Intelligent heat recycling end cover and filter

Technical Field

The utility model relates to a filter technical field specifically is an end cover and filter are recycled to intelligence heat.

Background

With the comprehensive implementation of the emission limit values and measurement methods of exhaust pollutants of compression ignition diesel engines and heavy-duty diesel vehicles, the diesel engine electronic control technology represented by the high-pressure common rail technology has the advantages that the diesel engine electronic control technology can flexibly control the fuel injection quantity, the injection pressure and the fuel injection timing under all working conditions, and can effectively reduce the fuel consumption and the exhaust gas low emission value, and the diesel engine electronic control technology is more and more concerned by automobile manufacturers. Especially, the diesel engine has the advantages of obvious compression ratio, high efficiency of converting fuel into work, low oil consumption, and economic advantage of saving fuel by 30 percent compared with the gasoline engine with the same power, and is popular with consumers. However, the low-temperature fuel has a great influence on the performance of the engine, so that the engine cannot be started easily, and the cold weather often causes the symptoms of fuel cut and flame failure (wax crystal is reduced by cold to block a filter), poor fuel atomization, poor combustion condition, black smoke and the like. In particular to the defects of cold use of an oil-water separator and low oil-water separation efficiency and the like which are necessary for a diesel engine, which not only brings more difficulty to the cold use of the engine and a vehicle, but also causes various problems of unstable working performance, insufficient power, black smoke emission and the like of the engine.

CN107476904A discloses an oil-water separator, which includes a filter element assembly, a heat recycling filter base assembly and a constant temperature heater assembly, the heat recycling filter base assembly includes a filter base casing and a thermal valve, the filter base casing is provided with an input port, a filter element assembly oil inlet port interface, a filter element assembly oil outlet port, an output port, an oil return port and a heat dissipation port, the input port is communicated with the filter element assembly oil inlet port interface through an input channel, the filter element assembly oil outlet port interface is communicated with the output port through an output channel, the oil return port is connected with the thermal valve through an oil return channel, the heat dissipation port is connected with the thermal valve through a heat dissipation channel, and the input channel is connected with the thermal valve through a heat recycling channel. The oil-water separator can mix hot fuel with low-temperature fuel before entering the filter element assembly to improve the oil temperature and supplement heat, so that the situation that the fuel separates out wax grains to block the through hole of the filter element and realize constant-temperature output is prevented. However, the oil-water separator has the following disadvantages: the fuel oil contains micro bubbles, the lighter micro bubbles can float on the upper part of the filter element assembly, the output port of the oil-water separator is arranged on the filter base shell and positioned above the filter element assembly, and the fuel oil enters the filter base shell, passes through the filter element assembly and is output from the output port, so that the micro bubbles enter an engine oil delivery pump or a high-pressure oil injection pump and an oil injector along with the fuel oil, and the symptoms of insufficient oil supply, attenuated power or unstable engine operation and the like are generated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving above-mentioned prior art not enough, provide an end cover and filter are recycled to intelligence heat, establish output channel on the lauter tun that is located filter element group spare below to filter element group spare's bottom and output channel intercommunication, thereby prevent to contain micro bubble in the oil of filter output, guarantee that the engine fuel supplies enough, solve because of containing the engine fuel supply that the microbubble leads to in the output fuel not enough, decay power or engine symptoms such as unstable work.

The utility model discloses the technical problem that will solve adopts following technical scheme to realize: an intelligent heat recycling end cover comprises an end cover body and a thermal power valve, wherein a cold oil inlet channel, a hot oil outlet channel and a mixing channel are arranged on the end cover body, and a mixed oil outlet communicated with the mixing channel is arranged on the end cover body; the cold oil inlet channel is communicated with the mixing channel, the hot oil inlet channel is communicated with the hot oil outlet channel, a valve port is arranged between the hot oil inlet channel and the mixing channel, and the thermal power valve is used for opening or closing the valve port.

The technical proposal of the utility model is also that: the thermal power valve comprises a thermal power device, a valve core and a return spring, and the valve core is matched with the valve port; the thermal power device comprises a thermal power device shell and a push rod, wherein thermal wax is filled in the thermal power device shell, the thermal power device shell is fixedly arranged at the bottom of the end cover body, the push rod is slidably arranged in the thermal power device shell, the push rod is fixedly connected with the lower end of the valve core, and the reset spring is arranged between the upper end of the valve core and the end cover body; the mixed oil outlet is positioned at the bottom of the end cover body.

The technical proposal of the utility model is also that: the end cover body comprises an end cover main body, an oil pipe mounting hollow bolt and a thermal actuator fixing nut, the cold oil inlet channel and the mixing channel are arranged in the end cover main body, the hot oil inlet channel and the hot oil outlet channel are arranged in the oil pipe, an oil pipe mounting hole is formed in the middle of the oil pipe, the oil pipe mounting hollow bolt penetrates through the oil pipe mounting hole and is in threaded connection with the end cover main body, a through hole is formed in the oil pipe mounting hollow bolt, the axis of the cold oil inlet channel is in the front-back direction, the axis of the mixing channel is in the vertical direction, and the hot oil inlet channel and the hot oil outlet channel are coaxial and the axis of the hot; the end cover comprises an end cover body and is characterized in that an A channel and a B channel are further arranged in the end cover body, the axis of the A channel is in the vertical direction, the axis of the B channel is in the left-right direction, the A channel is communicated with a hot oil inlet channel through an oil pipe mounting hollow bolt and a through hole, the B channel is communicated with a mixing channel, the B channel is connected with the A channel, and a valve port is arranged at the joint of the A channel and the B channel; the reset spring is arranged between the oil pipe installation hollow bolt and the valve core; the heat actuator filter barrel is fixedly connected with a heat actuator fixing nut, and the heat actuator fixing nut is installed at the bottom of the end cover main body in a threaded mode. By adopting the technical scheme, each channel and each mounting hole on the end cover body are formed by machining modes such as drilling and reaming, and compared with the casting forming mode, the end cover is low in manufacturing difficulty, difficult to generate defects and convenient to assemble.

The technical proposal of the utility model is also that: and a one-way valve which is communicated with the hot oil outlet channel in a one-way from the mixing channel is arranged between the mixing channel and the hot oil outlet channel. When the valve port is opened, the interior of the filter is in a negative pressure state under the action of the oil delivery pump, and the check valve is used for preventing air at the downstream of the hot oil outlet channel from entering the intelligent heat recycling end cover and finally entering an engine oil delivery pump or a high-pressure oil injection pump and an oil injector to generate the symptoms of insufficient oil supply, attenuated power or unstable engine operation and the like.

The technical proposal of the utility model is also that: the valve port is conical.

The utility model also provides a filter, including filter vat, filter element group spare and above-mentioned intelligent heat recycling end cover, the filter element group spare is installed inside the filter vat, the top at the filter vat is installed to the intelligent heat recycling end cover, the miscella export communicates with the filter vat inside, thermal power ware is located the filter vat; an output channel is arranged on the filter barrel, and the lower part of the filter element assembly is communicated with the output channel.

The technical proposal of the utility model is also that: the heating device also comprises a heater which is positioned at the bottom of the output channel. The technical scheme is adopted. When the engine is in cold start, if the oil temperature of the output channel is lower than the GB/T18297-2001 rack performance test standard, the heater heats the fuel in the output channel, and the sufficient diesel oil supply and smooth start of the engine in cold start are ensured.

The technical proposal of the utility model is also that: the heater is a far infrared heater.

The technical proposal of the utility model is also that: the filter element fixing structure is characterized by further comprising an end cover body fixing bolt, an end cover body fixing thread sleeve and a filter element assembly pressing spring, wherein an end cover body mounting hole is formed in the end cover body, the end cover body fixing bolt penetrates through the end cover body mounting hole, the end cover body fixing thread sleeve is fixedly connected with the filter barrel in a coaxial mode, the end cover body fixing bolt is in threaded connection with the end cover body fixing thread sleeve, and the pressing spring sleeve is arranged outside the end cover body fixing bolt and between the end cover body and the filter element assembly. Adopt this technical scheme, can further strengthen the firm in connection degree of end cover body and lauter tub to prevent filter element group spare displacement.

The technical proposal of the utility model is also that: the filter element assembly comprises a filter element, an upper end cover, a lower end cover and a sealing ring, wherein the upper end cover and the lower end cover are respectively and fixedly installed at the upper end and the lower end of the filter element, the sealing ring is sleeved between an end cover body fixing bolt and the upper end cover, the lower end cover is provided with a filter element output port, and the filter element assembly is communicated with an output channel through the filter element output port.

Compared with the prior art, the utility model discloses the beneficial effect of intelligence heat recycling end cover and filter does: (1) the filter of the utility model arranges the output channel on the filter vat under the filter element assembly, and the bottom of the filter element assembly is communicated with the output channel, thereby preventing the fuel oil output by the filter from containing micro-bubbles, ensuring the sufficient supply of the engine fuel oil, and solving the problems of insufficient supply of the engine fuel oil, power attenuation or unstable work of the engine and the like caused by the micro-bubbles contained in the output fuel oil; (2) the utility model discloses an end cover is recycled to intelligence heat, not only be adapted to diesel oil, gasoline engine fires oil filter, still be applicable to manufacturing fields such as lubricating oil filter and hydraulic oil filter, can make high temperature fuel mix with the low temperature fuel before getting into the filter core, prevent that low temperature fuel from appearing the wax crystalline grain and stopping up the filter core through-hole, with diesel oil, gasoline engine fuel temperature, lubricating oil temperature and hydraulic oil control are in optimum range, make the engine can play maximum power efficiency and minimum emission under minimum oil consumption index, guarantee the existence of engine relative operation idol lubricating oil film, extension engine life, to the hydraulic oil filter, then can ensure hydraulic equipment and have stable pressure characteristic.

Drawings

FIG. 1 is a main sectional view of an oil-water separator in an embodiment.

Fig. 2 is a front view of an embodiment of an intelligent heat reuse end cap.

Fig. 3 is a top view of an embodiment intelligent heat reuse end cap.

FIG. 4 is a main sectional view of the intelligent heat reuse end cover in the embodiment.

FIG. 5 is a side cross-sectional view of an embodiment of an intelligent heat reuse end cap

In the figure: 1. the filter comprises a cold oil inlet channel, a hot oil outlet channel, a mixing channel, a mixed oil outlet, a valve core, a return spring, 8, a valve port, 9, a heat power machine shell, 10, a push rod, 11, an end cover body, 12, an oil pipe, 13, an oil pipe installation hollow bolt, 14, a heat power machine fixing nut, 15, a through hole, 16, a channel A, a channel 17, a channel B, 18, a check valve, 19, a filter barrel, 20, a filter element, 21, an output channel, 22, a heater, 23, an end cover body fixing bolt, 24, an end cover body fixing threaded sleeve, 25, a filter element assembly pressing spring, 26, a water accumulation cup, 27, an upper end cover, 28, a lower end cover, 29, a sealing ring, 30, a filter element outlet, 31, a water level sensor, 32 and a.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the following further describes the embodiments of the present invention with reference to the attached drawings.

As shown in fig. 1 to 5, an oil-water separator (commonly called as a strainer, which is a kind of fuel filter) includes a filter barrel 19, a filter element assembly, an intelligent heat recycling end cover, an end cover body fixing bolt 23, an end cover body fixing thread sleeve 24, a filter element assembly compression spring 25, a heater 22, and a water accumulation cup.

The intelligent heat reuse end cap includes an end cap body, a thermal valve, and a one-way valve 18.

The end cover body comprises an end cover main body 11, an oil pipe 12, an oil pipe mounting hollow bolt 13 and a thermal actuator fixing nut 14. The end cover main body 11 is internally provided with a cold oil inlet channel 1, a mixing channel 4, an A channel 16 and a B channel 17. The axis of cold oil inlet channel 1 is the fore-and-aft direction, and the axis of mixing channel 4 is vertical direction, and cold oil inlet channel 1 and mixing channel 4 intercommunication, the bottom of end cover main part 11 are equipped with the miscella export 5 with mixing channel 4 intercommunication. The axis of the channel A16 is vertical, the axis of the channel B17 is left and right, the channel B17 is communicated with the mixing channel 4, the channel B17 is connected with the channel A16, and a conical valve port 8 is arranged at the joint of the channel A16 and the channel B17.

The oil pipe 12 is internally provided with a hot oil inlet channel 2 and a hot oil outlet channel 3, and the hot oil inlet channel 2 is communicated with the hot oil outlet channel 3. An oil pipe mounting hole with the axis in the vertical direction is formed in the middle of the oil pipe 12, and an oil pipe mounting hollow bolt 13 penetrates through the oil pipe mounting hole and is in threaded connection with the end cover main body 11 so as to fixedly connect the end cover main body 11 with the oil pipe 12. The oil pipe mounting hollow bolt 13 is provided with a through hole 15. The hot oil inlet passage 2 and the hot oil outlet passage 3 are coaxial and have their axes in the front-rear direction. The hot oil inlet channel 2 is communicated with the channel A16 through an oil pipe mounting hollow bolt 13 and a through hole 15. A check valve 18 is provided between the a-channel 16 and the hot oil outlet channel 3, the check valve allowing one-way communication from the a-channel 16 to the hot oil outlet channel 3. The check valve 18 in this embodiment is an umbrella valve, and is used to prevent air at the downstream of the hot oil outlet channel 3 from entering the intelligent heat recycling end cover and finally entering an engine oil transfer pump or a high-pressure oil injection pump and an oil injector to cause symptoms such as insufficient oil supply, attenuated power or unstable engine operation.

The thermal valve is arranged at the joint of the A channel 16 and the B channel 17, and comprises a thermal power device, a valve core 6 and a return spring 7. The valve core 6 is matched with the valve port 8. The thermal power device comprises a thermal power device shell 9 and a push rod 10, wherein thermal wax is filled in the thermal power device shell 9. The thermal actuator casing 9 is fixedly installed at the bottom of the end cover main body 11, specifically, the thermal actuator filter barrel 19 is fixedly connected with the thermal actuator fixing nut 14, and the thermal actuator fixing nut 14 is installed at the bottom of the end cover main body 11 in a threaded mode. The push rod 10 is slidably mounted inside the thermal power device shell 9, the push rod 10 is fixedly connected with the lower end of the valve core 6, and the return spring 7 is mounted between the upper end of the valve core 6 and the oil pipe mounting hollow bolt 13. The thermal power device is used for driving the valve core 6 to close the valve port, and the return spring 7 is used for driving the valve core 6 to open the valve port 8.

All passageways and mounting holes on the end cover body are formed by drilling, reaming and other machining modes, and compared with a casting forming mode, the end cover body is low in manufacturing difficulty, not prone to generating defects and convenient to assemble.

The intelligent heat recycling end cover is installed at the top of the filter vat 19, specifically, the end cover main body 11 is buckled at the top of the filter vat 19 through the spigot fit seal, an end cover body installation hole is formed in the end cover body, an end cover body fixing bolt 23 penetrates through the end cover body installation hole, the lower end of an end cover body fixing threaded sleeve 24 is cast into the filter vat 19, and the end cover body fixing bolt 23 is in threaded connection with the end cover body fixing threaded sleeve 24.

The filter element assembly is installed inside the filter barrel 19, and specifically, the filter element assembly includes filter element 20, upper end cover 27, lower end cover 28 and sealing washer 29, and upper end cover 27 and lower end cover 28 are fixed mounting respectively at the upper end and the lower extreme of filter element 20, and filter element 20 cover is established outside end cover body fixing bolt 23 and end cover body fixed thread bush 24, and sealing washer 29 cover is established between end cover body fixing bolt 23 and upper end cover 27. The pressing spring 25 is sleeved outside the end cover body fixing bolt 23 and is located between the end cover main body 11 and the upper end cover 27. The lower end cap 28 is provided with a cartridge outlet 30.

The mixed oil outlet 5 is communicated with the interior of the filter barrel 19, and the heat power device is positioned in the filter barrel 19. An output channel 21 is arranged on the filter barrel 19, and the filter element assembly is communicated with the output channel 21 through a filter element output port 30.

The heater 22 is located at the bottom of the output channel 21, and the heater 22 is a far infrared heater. When the engine is in cold start, if a temperature sensor (not shown in the figure) arranged in the output channel 21 or a pipeline at the downstream of the output channel detects that the oil temperature is lower than the GB/T18297-2001 rack performance test standard, the heater 22 heats the fuel in the output channel 21, and the sufficient diesel oil supply and the smooth start of the engine in cold start are ensured.

The water accumulation cup 26 is arranged at the lower end of the filter barrel 20, a water level sensor 31 is arranged in the water accumulation cup 26, and a drain valve 32 is arranged at the bottom of the water accumulation cup 26.

The working principle of the oil-water separator is explained by using 0# diesel oil as follows:

when the engine is in cold start, if the oil temperature output by the output channel 21 is lower than 3 ℃, the module temperature controller provides high potential for the heater 22, the heater 22 is electrified to release high-temperature thermal light waves, and diesel oil lower than the use temperature requirement is rapidly heated.

After the engine is started and operated, diesel oil lubricated and radiated by an oil delivery pump and a high-pressure oil injection pump matching part enters an intelligent heat recycling end cover through a hot oil inlet channel 2, at the moment, if the oil temperature output through an output channel 21 is lower than the specified requirement, thermal wax in a thermal power machine shell 9 is not expanded, a valve port 8 is opened by a valve core 6 under the action of a return spring 7, the hot oil sequentially enters a mixing channel through an A channel 16, a thermal power valve and a B channel 17, and is mixed with cold oil from a cold oil inlet channel 1 and then enters a filter barrel 19. If the oil temperature output by the output channel 21 does not meet the specified requirement, the module temperature controller provides a heating potential which meets the requirement that the oil temperature is stabilized to the requirement for the heater 22 according to the temperature difference data provided by the temperature sensor. If the temperature of the mixed diesel oil meets the specified requirements, the temperature controller closes the output and cuts off the working power supply of the heater 22 to stop heating.

In hot summer, if the temperature of the oil output through the output channel 21 is higher than the specified value, the thermal wax in the thermal power machine shell 9 expands, the push valve core 6 is pushed by the push rod 10 to gradually close the valve port 8, so that the flow of the hot oil entering the channel B17 from the channel A16 is reduced, and the engine returns redundant hot diesel oil to return to the oil tank through the hot oil outlet channel 3 for heat dissipation.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides an end cover is recycled to intelligence heat which characterized in that: the hot oil mixing device comprises an end cover body and a thermal power valve, wherein a cold oil inlet channel (1), a hot oil inlet channel (2), a hot oil outlet channel (3) and a mixing channel (4) are arranged on the end cover body, and a mixed oil outlet (5) communicated with the mixing channel (4) is arranged on the end cover body; the cold oil inlet channel (1) is communicated with the mixing channel (4), the hot oil inlet channel (2) is communicated with the hot oil outlet channel (3), a valve port (8) is arranged between the hot oil inlet channel (2) and the mixing channel (4), and the thermal valve is used for opening or closing the valve port (8).

2. The intelligent heat reuse end cap of claim 1, wherein: the thermal power valve comprises a thermal power device, a valve core (6) and a return spring (7), wherein the valve core (6) is matched with a valve port (8); the thermal power device comprises a thermal power device shell (9) and a push rod (10), wherein thermal wax is filled in the thermal power device shell (9), the thermal power device shell (9) is fixedly installed at the bottom of an end cover body, the push rod (10) is installed in the thermal power device shell (9) in a sliding mode, the push rod (10) is fixedly connected with the lower end of a valve core (6), and a reset spring (7) is installed between the upper end of the valve core (6) and the end cover body; the mixed oil outlet (5) is positioned at the bottom of the end cover body.

3. The intelligent heat reuse end cap of claim 2, wherein: the end cover body comprises an end cover main body (11), an oil pipe (12), an oil pipe mounting hollow bolt (13) and a thermal actuator fixing nut (14), the cold oil inlet channel (1) and the mixing channel (4) are arranged in the end cover main body (11), the hot oil inlet channel (2) and the hot oil outlet channel (3) are arranged in the oil pipe (12), an oil pipe mounting hole is formed in the middle of the oil pipe (12), the oil pipe mounting hollow bolt (13) penetrates through the oil pipe mounting hole and is in threaded connection with the end cover main body (11), a through hole (15) is formed in the oil pipe mounting hollow bolt (13), the axis of the cold oil inlet channel (1) is in the front-back direction, the axis of the mixing channel (4) is in the vertical direction, the hot oil inlet channel (2) and the hot oil outlet channel (3) are coaxial, and the axis of the hot oil inlet channel (2; the end cover comprises an end cover main body (11) and is characterized in that an A channel (16) and a B channel (17) are further arranged in the end cover main body (11), the axis of the A channel (16) is in the vertical direction, the axis of the B channel (17) is in the left-right direction, the A channel (16) is communicated with a hot oil inlet channel (2) through an oil pipe mounting hollow bolt (13) and a through hole (15), the B channel (17) is communicated with a mixing channel (4), the B channel (17) is connected with the A channel (16), and a valve port (8) is formed in the connection position of the A channel (16) and the B channel (17); the return spring (7) is arranged between the oil pipe installation hollow bolt (13) and the valve core (6); the heat actuator filter barrel (19) is fixedly connected with a heat actuator fixing nut (14), and the heat actuator fixing nut (14) is installed at the bottom of the end cover main body (11) in a threaded mode.

4. The intelligent heat reuse end cap of claim 1, wherein: and a one-way valve (18) which is communicated with the hot oil outlet channel (3) in one way from the mixing channel (4) is arranged between the mixing channel (4) and the hot oil outlet channel (3).

5. The intelligent heat reuse end cap according to any one of claims 1-4, wherein: the valve port (8) is conical.

6. A filter, characterized by: comprises a filter barrel (19), a filter core assembly and the intelligent heat recycling end cover of claim 2 or 3, wherein the filter core assembly is arranged inside the filter barrel (19), the intelligent heat recycling end cover is arranged at the top of the filter barrel (19), the mixed oil outlet (5) is communicated with the inside of the filter barrel (19), and the thermal power device is positioned inside the filter barrel (19); an output passage (21) is arranged on the filter barrel (19), and the lower part of the filter element assembly is communicated with the output passage (21).

7. A filter as claimed in claim 6, wherein: the device also comprises a heater (22), wherein the heater (22) is positioned at the bottom of the output channel (21).

8. A filter as claimed in claim 7, wherein: the heater (22) is a far infrared heater.

9. A filter according to any one of claims 6 to 8, wherein: still include end lid body fixing bolt (23), end lid body fixed thread cover (24) and filter element group spare pressure spring (25), be equipped with the end lid body mounting hole on the end lid body, end lid body fixing bolt (23) pass the end lid body mounting hole, end lid body fixed thread cover (24) and the coaxial fixed connection of lauter tub (19), end lid body fixing bolt (23) and end lid body fixed thread cover (24) threaded connection, pressure spring (25) cover is established and is established end lid body fixing bolt (23) outside and be located between end lid body and the filter element group spare.

10. A filter as claimed in claim 9, wherein: the filter element assembly comprises a filter element (20), an upper end cover (27), a lower end cover (28) and a sealing ring (29), wherein the upper end cover (27) and the lower end cover (28) are respectively and fixedly arranged at the upper end and the lower end of the filter element (20), the sealing ring (29) is sleeved between an end cover body fixing bolt (23) and the upper end cover (27), the lower end cover (28) is provided with a filter element output port (30), and the filter element assembly is communicated with an output channel (21) through the filter element output port (30).