CN213589948U

CN213589948U - Compressed gas filter

Info

Publication number: CN213589948U
Application number: CN202022382867.1U
Authority: CN
Inventors: 李国军; 秦铎; 毕大鹏; 曹立新
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-07-02
Anticipated expiration: 2030-10-23

Abstract

The utility model discloses a compressed gas filter, it belongs to diesel engine tail gas aftertreatment technical field, include: a base assembly; the filter element assembly is arranged on the base assembly, and an air inlet channel and an air outlet channel are arranged on the base assembly; the urea liquid back suction prevention assembly comprises a valve seat, a sealing ball, a reset elastic part and an elastic part gland, wherein the valve seat is arranged in the air outlet channel, a first section of hole and a second section of hole are formed in the valve seat, the elastic part gland, the sealing ball and the reset elastic part are all positioned in the second section of hole, the reset elastic part is in a compression state, one end of the reset elastic part is abutted against the elastic part gland, and the other end of the reset elastic part is abutted against the sealing ball; be equipped with the venthole in the elastic component gland, the gas in the filter core assembly can spill over via the venthole. The utility model discloses can prevent that compressed gas from driving urea liquid reverse flow.

Description

Compressed gas filter

Technical Field

The utility model relates to a diesel engine tail gas aftertreatment technical field especially relates to a compressed gas filter.

Background

The tail gas of the diesel engine refers to tail gas sprayed out after the diesel engine burns diesel oil. The tail gas of the diesel engine is directly discharged into the atmosphere without being treated, which causes serious pollution to the atmospheric environment and also has extremely bad influence on the human health. At present, the common diesel engine tail gas aftertreatment method is to use a gas-drive urea injection system to inject urea to carry out reduction reaction on the diesel engine tail gas.

In a gas-driven urea injection system, a compressed gas filter is generally used for filtering impurities such as dust and engine oil in compressed gas, and clean compressed air is provided for the gas-driven urea injection system to serve as a power source of the urea injection system.

However, in the prior art, when the compressed gas filter is not operated during use, and the internal pressure of the compressed gas filter is lower than the pressure at the outlet end of the compressed gas filter, the compressed gas may flow in the reverse direction, and the urea aqueous solution may enter the compressed gas filter from the outlet end of the compressed gas filter, thereby damaging the filter element in the compressed gas filter and affecting the filtering effect of the compressed gas filter.

Therefore, a compressed gas filter is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compressed gas filter, when the internal pressure that can avoid compressed gas filter is less than the pressure of compressed gas filter's exit end, compressed gas reverse flow, lead to urea aqueous solution from compressed gas filter's exit end entering compressed gas filter in.

As the conception, the utility model adopts the technical proposal that:

a compressed gas filter comprising:

a base assembly;

the filter element assembly is arranged on the base assembly, an air inlet channel and an air outlet channel are arranged on the base assembly, and external air can sequentially pass through the air inlet channel, the filter element assembly and the air outlet channel;

the urea liquid back suction prevention assembly comprises a valve seat, a sealing ball, a resetting elastic part and an elastic part gland, wherein the valve seat is installed in the air outlet channel, a first section of hole and a second section of hole which are sequentially arranged along the air outlet direction of the air outlet channel are formed in the valve seat, the elastic part gland, the sealing ball and the resetting elastic part are all located in the second section of hole, the resetting elastic part is in a compression state, one end of the resetting elastic part is abutted against the elastic part gland, the other end of the resetting elastic part is abutted against the sealing ball, and the sealing ball can block an outlet of the first section of hole under the action of the resetting elastic part or open an outlet of the first section of hole under the action of the pressure of gas in the filter element assembly;

be equipped with the venthole in the elastic component gland, the gas in the filter core assembly can via the venthole overflows.

Optionally, an elastic piece mounting groove is formed in the elastic piece gland, and the end of the reset elastic piece is abutted to the groove bottom of the elastic piece mounting groove.

Optionally, be equipped with a plurality of in the elastic component gland the venthole, it is a plurality of venthole is the circumference and distributes.

Optionally, one end of the second section of hole close to the first section of hole is provided with a tapered hole directly communicated with the outlet of the first section of hole, and the sealing ball can abut against the inner wall of the tapered hole under the action of the return elastic member to block the outlet of the first section of hole.

Optionally, the compressed gas filter further comprises a hand valve assembly mounted to an air inlet end of the air inlet passage.

Optionally, the compressed gas filter further comprises an air inlet quick connector, and the air inlet quick connector is mounted at the air inlet end of the hand valve assembly.

Optionally, the hand valve assembly comprises an air inlet joint and a clamping cap, one end of the air inlet joint is arranged in the air inlet channel, the other end of the air inlet joint is arranged in the air inlet quick connector, and the clamping cap is sleeved on the air inlet joint and can be abutted against the outer wall of the air inlet channel.

Optionally, the hand valve assembly further includes a first sealing ring and a second sealing ring, the first sealing ring is disposed at a joint of the air inlet joint and the air inlet channel, and the second sealing ring is disposed at a joint of the air inlet joint and the air inlet quick connector.

Optionally, the compressed gas filter further comprises a gas outlet quick connector, the gas outlet quick connector is mounted at the gas outlet end of the gas outlet channel, and gas in the filter element assembly can sequentially overflow through the gas outlet hole and the gas outlet quick connector.

Optionally, the filter element assembly includes a filter element and a filter screen arranged in sequence along the air inlet direction.

The utility model provides a compressed gas filter prevents urea liquid suck-back assembly through setting up in the air outlet channel of base assembly, prevents that compressed gas reverse flow from arousing in urea aqueous solution gets into compressed gas filter from compressed gas filter's exit end, avoids urea aqueous solution to cause destruction to the filter core assembly, has promoted the maintenance cycle of filter core assembly.

When the compressed gas filter normally works, when the gas pressure from the base assembly is greater than the external pressure of the gas outlet channel, under the action of the difference of the internal and external gas pressures, the sealing ball applies pressure towards the pressing cover of the elastic part to the reset elastic part, so that the reset elastic part is compressed towards the outlet direction of the gas outlet channel, the sealing ball leaves the outlet of the first section of hole to open the outlet of the first section of hole, and at the moment, the compressed gas overflows through the gas outlet channel, the first section of hole and the gas outlet hole in sequence and enters the urea injection system.

When the compressed gas filter does not work, the gas pressure in the base assembly is smaller than the external pressure of the gas outlet channel, at the moment, under the action of the internal and external gas pressure difference, the sealing ball moves towards the direction close to the outlet of the first section of hole until the outlet of the first section of hole is blocked, the initial compression state is restored by the resetting elastic piece, under the elastic action of the resetting elastic piece, the sealing ball stably blocks the outlet of the first section of hole, compressed gas cannot enter the compressed gas filter through the first section of hole, and then urea water solution in the urea injection system can be prevented from flowing reversely to enter the compressed gas filter from the outlet end of the compressed gas filter.

Drawings

Fig. 1 is a schematic structural diagram of a compressed gas filter according to an embodiment of the present invention;

FIG. 2 is a schematic view of the anti-back absorption assembly for urea solution installed in the air outlet channel according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a urea-proof liquid suck-back assembly provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a hand valve assembly provided in an embodiment of the present invention;

fig. 5 is a schematic view of a perspective view of a filter cartridge assembly according to an embodiment of the present invention connected to a base;

fig. 6 is a schematic structural view of another view angle of the connection between the filter element assembly and the base according to the embodiment of the present invention.

In the figure:

1. a base assembly; 11. an air intake passage; 12. an air outlet channel;

2. a filter element assembly; 21. a filter element; 22. filtering with a screen;

3. the urea liquid back suction prevention assembly; 31. a valve seat; 311. a first section of bore; 312. a second section of holes; 32. a sealing ball; 33. a restoring elastic member; 34. the elastic part is pressed; 341. an air outlet; 342. an elastic piece mounting groove;

4. a hand valve assembly; 41. an air inlet joint; 42. a clamping cap; 43. a first seal ring; 44. a second seal ring;

5. a quick air inlet connector;

6. air outlet quick connector.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 5, the present embodiment provides a compressed gas filter capable of preventing the occurrence of a situation where a reverse flow of compressed gas causes an aqueous urea solution to enter the compressed gas filter from the outlet end of the compressed gas filter.

Specifically, in the present embodiment, the compressed gas filter includes a base assembly 1, a filter element assembly 2 and a urine back suction prevention assembly 3.

Specifically, the filter element assembly 2 is arranged on the base assembly 1, the base assembly 1 is provided with an air inlet channel 11 and an air outlet channel 12, and external air can sequentially pass through the air inlet channel 11, the filter element assembly 2 and the air outlet channel 12.

Referring to fig. 2 and 3, the anti-urea liquid suck-back assembly 3 includes a valve seat 31, a sealing ball 32, a restoring elastic member 33 and an elastic member gland 34, the valve seat 31 is installed in the air outlet channel 12, the valve seat 31 is provided with a first section of hole 311 and a second section of hole 312 which are sequentially arranged along the air outlet direction of the air outlet channel 12, the elastic member gland 34, the sealing ball 32 and the restoring elastic member 33 are all located in the second section of hole 312, the restoring elastic member 33 is in a compressed state, one end of the restoring elastic member is abutted against the elastic member gland 34, the other end of the restoring elastic member is abutted against the sealing ball 32, the sealing ball 32 can block the outlet of the first section of hole 311 under the action of the restoring elastic member 33, or the outlet of the first section of hole 311 is opened under the; an air outlet 341 is formed in the elastic part pressing cover 34, and air in the filter element assembly 2 can overflow through the air outlet 341.

Specifically, in the present embodiment, the radial dimension at the outlet of the first stage holes 311 is smaller than the radial dimension of the second stage holes 312. The valve seat 31 is a revolving body structure, and the valve seat 31 is arranged in the air outlet channel 12 in an interference manner; the elastic member gland 34 is a revolving body structure and is arranged in the second section hole 312 in an interference manner.

In the compressed gas filter provided by the embodiment, the urea liquid back suction preventing assembly 3 is arranged in the air outlet channel 12 of the base assembly 1, so that the urea aqueous solution is prevented from entering the compressed gas filter from the outlet end of the compressed gas filter due to the reverse flow of the compressed gas.

When the compressed gas filter works normally, when the pressure of the gas from the inside of the base assembly 1 is greater than the external pressure of the gas outlet channel 12, under the action of the difference between the internal and external pressures, the sealing ball 32 applies a pressure to the elastic member 33 toward the elastic member gland 34, so that the elastic member 33 is compressed toward the outlet of the gas outlet channel 12, the sealing ball 32 leaves the outlet of the first section of hole 311 to open the outlet of the first section of hole 311, and at this time, the compressed gas overflows through the gas outlet channel 12, the first section of hole 311 and the gas outlet 341 in sequence and enters the urea injection system.

When the compressed gas filter does not work, the gas pressure in the base assembly 1 is smaller than the external pressure of the gas outlet channel 12, at the moment, under the action of the difference of the internal and external gas pressures, the sealing ball 32 moves towards the direction close to the outlet of the first section hole 311 until the outlet of the first section hole 311 is blocked, the reset elastic piece 33 recovers the initial compression state, under the action of the elastic force of the reset elastic piece 33, the sealing ball 32 stably blocks the outlet of the first section hole 311, compressed gas cannot enter the compressed gas filter through the first section hole 311, and therefore urea water solution in the urea injection system can be prevented from entering the compressed gas filter from the outlet end of the compressed gas filter due to the reverse flow of the compressed gas.

Specifically, in the present embodiment, the return elastic member 33 is a compression spring.

Further, in order to avoid the deflection of the elastic restoring member 33 during repeated deformation, in the present embodiment, an elastic member mounting groove 342 is formed in the elastic member pressing cover 43, the elastic restoring member 33 is partially located in the elastic member mounting groove 342, and an end of the elastic restoring member 33 abuts against a groove bottom of the elastic member mounting groove 342. The side wall of the elastic member mounting groove 342 can limit the restoring elastic member 33.

Preferably, in order to ensure that the compressed gas in the compressed gas filter can quickly overflow, in this embodiment, a plurality of air outlets 341 are formed in the elastic member gland 34, and the plurality of air outlets 341 are circumferentially distributed.

Further, in order to guide and limit the movement of the sealing ball 32, a tapered hole directly communicated with the outlet of the first section hole 311 is arranged at one end of the second section hole 312 close to the first section hole 311, and the sealing ball 32 can abut against the inner wall of the tapered hole under the action of the reset elastic piece 33 to block the outlet of the first section hole 311.

Referring to fig. 1, further, in the present embodiment, the compressed gas filter further includes a hand valve assembly 4, an inlet quick connector 5 and an outlet quick connector 6.

Wherein, the hand valve assembly 4 is arranged at the air inlet end of the air inlet channel 11. The quick air inlet connector 5 is arranged at the air inlet end of the hand valve assembly 4. The air outlet quick connector 6 is installed at the air outlet end of the air outlet channel 12, and the air in the filter element assembly 2 can sequentially overflow through the air outlet hole 341 and the air outlet quick connector 6.

Specifically, in the present embodiment, the hand valve assembly 4 is in an open state when the compressed gas filter is in operation. Compressed gas from the APU sequentially enters the filter element assembly 2 through the air inlet quick connector 5 and the hand valve assembly 4, after being filtered by the filter element assembly 2, the compressed gas enters the air outlet channel 12 of the base assembly 1 and pushes the sealing ball 32 to open the first section hole 311, then the compressed gas sequentially overflows through the air outlet hole 341 of the elastic part gland 34 and the air outlet quick connector 6, and the clean compressed gas is conveyed into the urea injection system through the air outlet quick connector 6 to serve as a power source of the urea injection system.

Referring to fig. 4, further, in the present embodiment, the hand valve assembly 4 includes an air inlet joint 41 and a clamping cap 42, one end of the air inlet joint 41 is disposed in the air inlet passage 11, the other end of the air inlet joint is disposed in the air inlet quick-connection plug 5, and the clamping cap 42 is sleeved on the air inlet joint 41 and can abut against an outer wall of the air inlet passage 11.

Further, in order to improve the sealing effect at the connection between the air inlet joint 41 and the air inlet channel 11 and at the connection between the air inlet joint 41 and the air inlet quick-plugging joint 5, in this embodiment, the hand valve assembly 4 further includes a first sealing ring 43 and a second sealing ring 44, the first sealing ring 43 is disposed at the connection between the air inlet joint 41 and the air inlet channel 11, and the second sealing ring 44 is disposed at the connection between the air inlet joint 41 and the air inlet quick-plugging joint 5.

When the air inlet connector 41 is installed, one end of the air inlet connector is directly connected to the air inlet channel 11 in an inserting mode, the direction of the hand valve switch is adjusted, and the clamping cap 42 is screwed tightly.

Referring to fig. 5, specifically, the filter cartridge assembly 2 includes a filter cartridge 21 and a filter screen 22 which are arranged in this order in the air intake direction. Optionally, in this embodiment, the filter element 21 is a composite filter material, and can filter out impurities such as dust, rust, engine oil, and the like in the air; the filter net 22 is a stainless steel filter net having a filtering accuracy of 30 μm. A stainless steel filter screen with the filtering precision of 30 mu m is selected as the filter screen 22, so that the shedding fibers can be effectively filtered, and the shedding fibers are prevented from entering the urea nozzle through the urea water solution to cause the blockage failure of the urea nozzle.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A compressed gas filter, comprising:

a base assembly (1);

the filter element assembly (2) is arranged on the base assembly (1), an air inlet channel (11) and an air outlet channel (12) are arranged on the base assembly (1), and external air can sequentially pass through the air inlet channel (11), the filter element assembly (2) and the air outlet channel (12);

the urea liquid back suction prevention assembly (3) comprises a valve seat (31), a sealing ball (32), a reset elastic part (33) and an elastic part gland (34), the valve seat (31) is arranged in the air outlet channel (12), a first section of hole (311) and a second section of hole (312) which are sequentially arranged along the air outlet direction of the air outlet channel (12) are arranged in the valve seat (31), the elastic part gland (34), the sealing ball (32) and the return elastic part (33) are all positioned in the second section of hole (312), the reset elastic piece (33) is in a compressed state, one end of the reset elastic piece is abutted with the elastic piece gland (34), the other end of the reset elastic piece is abutted with the sealing ball (32), the sealing ball (32) can block the outlet of the first section of hole (311) under the action of the reset elastic piece (33), or the outlet of the first section of holes (311) is opened under the pressure of the gas in the filter element assembly (2);

be equipped with venthole (341) in elastic component gland (34), the gas in filter core assembly (2) can overflow through venthole (341).

2. The compressed gas filter according to claim 1, wherein an elastic member fitting groove (342) is formed in the elastic member cover (34), and an end of the return elastic member (33) abuts against a groove bottom of the elastic member fitting groove (342).

3. The compressed gas filter according to claim 1, wherein a plurality of said gas outlets (341) are formed in said elastic member gland (34), and said plurality of said gas outlets (341) are circumferentially distributed.

4. The compressed gas filter according to claim 1, wherein one end of the second section of hole (312) close to the first section of hole (311) is provided with a tapered hole which is directly communicated with the outlet of the first section of hole (311), and the sealing ball (32) can be abutted with the inner wall of the tapered hole under the action of the return elastic piece (33) to seal off the outlet of the first section of hole (311).

5. The compressed gas filter according to claim 1, further comprising a hand valve assembly (4), the hand valve assembly (4) being mounted to an inlet end of the inlet passage (11).

6. The compressed gas filter according to claim 5, further comprising a quick air inlet connector (5), wherein the quick air inlet connector (5) is mounted at an air inlet end of the hand valve assembly (4).

7. The compressed gas filter according to claim 6, wherein the hand valve assembly (4) comprises an air inlet joint (41) and a clamping cap (42), one end of the air inlet joint (41) is arranged in the air inlet channel (11), the other end of the air inlet joint is arranged in the air inlet quick connector (5), and the clamping cap (42) is sleeved on the air inlet joint (41) and can be abutted against the outer wall of the air inlet channel (11).

8. The compressed gas filter according to claim 7, wherein the hand valve assembly (4) further comprises a first sealing ring (43) and a second sealing ring (44), the first sealing ring (43) is arranged at the joint of the air inlet joint (41) and the air inlet channel (11), and the second sealing ring (44) is arranged at the joint of the air inlet joint (41) and the air inlet quick connector (5).

9. The compressed gas filter according to claim 1, further comprising a gas outlet quick connector (6), wherein the gas outlet quick connector (6) is installed at the gas outlet end of the gas outlet channel (12), and the gas in the filter element assembly (2) can sequentially overflow through the gas outlet hole (341) and the gas outlet quick connector (6).

10. The compressed gas filter according to claim 1, characterized in that the filter cartridge assembly (2) comprises a filter cartridge (21) and a filter screen (22) arranged in succession in the intake direction.