CN111749763A - Fire-retardant valve core of motor vehicle exhaust spark extinguisher and fire extinguishing device - Google Patents
Fire-retardant valve core of motor vehicle exhaust spark extinguisher and fire extinguishing device Download PDFInfo
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- CN111749763A CN111749763A CN202010552958.7A CN202010552958A CN111749763A CN 111749763 A CN111749763 A CN 111749763A CN 202010552958 A CN202010552958 A CN 202010552958A CN 111749763 A CN111749763 A CN 111749763A
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- valve core
- fire
- shell
- shaft sleeve
- motor vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/06—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for extinguishing sparks
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention discloses a fire-retardant valve core of an exhaust spark extinguisher of a motor vehicle, which comprises a first valve core, a second valve core and an electronic tag handball, wherein first connecting blocks are integrally formed on two sides of the first valve core, second connecting blocks are integrally formed on two sides of the second valve core, a first fastening bolt is in threaded connection with the first connecting blocks, the first connecting blocks and the second connecting blocks are fixedly connected through the first fastening bolt, a first shaft sleeve is arranged at the top of the first valve core, a second shaft sleeve is arranged at the bottom of the second valve core, and the bottom of the first shaft sleeve is in threaded connection with the top of the second shaft sleeve. The invention also discloses a fire extinguishing device. According to the invention, after the first shaft sleeve and the second shaft sleeve are connected, the first connecting block and the second connecting block are fixedly connected through the first fastening bolt, so that the stability of connection between the first valve core and the second valve core is increased, and the connection is firmer.
Description
Technical Field
The invention belongs to the technical field of motor vehicle exhaust spark extinguishers, and particularly relates to a fire-retardant valve core of a motor vehicle exhaust spark extinguisher and a fire extinguishing device.
Background
The motor vehicle exhaust spark arrester is also known as a vehicle fireproof cover, a vehicle exhaust pipe fireproof cover, a spark arrester, a fireproof cover, a fireproof cap, a vehicle fireproof cover, a vehicle flame arrester, a vehicle fireproof cap and a fireproof cap), and is a safe fireproof and fire-retardant device which is installed behind a motor vehicle exhaust pipe, allows exhaust gas flow to pass through and prevents flames and sparks in the exhaust gas flow from being sprayed out. The fire-retardant fireproof material is suitable for flammable and explosive fire-resistant units and fire-resistant areas such as warehouse goods yards, oil fields, forest areas, coal mines, petrochemical liquefied gas plants, paper mills, airports and the like. The product is very convenient and fast to install, only the opening end with the clamping hoop of a specification product matched with the caliber is sleeved on the corresponding motor vehicle exhaust pipe, and then nuts on two sides of the clamping hoop are screwed, however, various motor vehicle exhaust spark extinguisher fire-retardant valve cores and fire extinguishing devices on the market still have various problems.
But as the open of authorized bulletin number CN102410067B discloses a switch spiral-flow type motor vehicle exhaust spark arrester, its has realized eliminating the loaded down with trivial details of dismouting repeatedly, improves conveying efficiency, but does not solve the problem that current motor vehicle exhaust spark arrester back-fire relief valve core and extinguishing device still exist: the valve part is fixed only through the axle sleeve, leads to being connected between the case stable inadequately, and the connection is insecure, has reduced life, and inconvenient dismantlement to electronic tags handball part simultaneously, after the inside damage of electronic tags handball, inconvenient change, extinguishing device is inconvenient in addition installs fixedly to the back-fire relief case, and we provide a motor vehicle exhaust spark extinguisher back-fire relief case and extinguishing device for this reason.
Disclosure of Invention
The invention aims to provide a fire-retardant valve core of an exhaust spark arrester of a motor vehicle and a fire extinguishing device, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a fire-retardant valve core of an exhaust spark extinguisher of a motor vehicle comprises a first valve core, a second valve core and an electronic tag handball, wherein first connecting blocks are integrally formed on two sides of the first valve core, second connecting blocks are integrally formed on two sides of the second valve core, a first fastening bolt is in threaded connection with the first connecting blocks, the first connecting blocks and the second connecting blocks are fixedly connected through the first fastening bolt, a first shaft sleeve is arranged at the top of the first valve core, a second shaft sleeve is arranged at the bottom of the second valve core, the bottom of the first shaft sleeve is in threaded connection with the top of the second shaft sleeve, a middle impeller is rotatably arranged on the outer sides of the first shaft sleeve and the second shaft sleeve, a rotating groove is jointly formed inside the first valve core and the second valve core, the middle impeller is rotatably arranged in the rotating groove, a first mounting block is integrally formed on one side of the first valve core, one side integrated into one piece of second case has the second installation piece, be provided with the locating hole jointly between first installation piece with the second installation piece, the fixed connecting rod that is provided with in one side of electronic tags handball, the other end of connecting rod is pegged graft in the locating hole, the fixed orifices has been seted up to the other end surface symmetry of connecting rod, first installation piece with the surface of second installation piece is all fixed and is provided with the fixed block, the inside slip of fixed block is provided with the gag lever post, the one end of gag lever post is pegged graft in the fixed orifices, the cavity has been seted up to the inside of fixed block, be provided with the spring in the cavity, the spring cup joints on the circumference of gag lever post.
Preferably, an air inlet hole is formed in the upper surface of the first valve core, a first side hole is formed in the outer surface of the first valve core, and at least ten groups of the first side holes are formed in the surface of the first valve core.
Preferably, the lower surface of the second valve core is provided with an air outlet, the outer surface of the second valve core is provided with a second side hole, and at least ten groups of the second side holes are arranged on the surface of the second valve core.
Preferably, the other end of the first fastening bolt is in threaded connection with a first nut, and the first nut is arranged on the lower surface of the second connecting block.
Preferably, one end of the spring is fixedly arranged on the circumference of the limiting rod, and the other end of the spring is fixedly arranged on the inner wall of the cavity.
Preferably, the other end of the limiting rod is fixedly provided with a pull ring, and the pull ring is arranged on the outer side of the fixing block.
Preferably, the intermediate impeller is composed of 6 to 16 blades, and the inclination angle of each blade is 20 ° to 40 °.
Preferably, the first shaft sleeve and the second shaft sleeve are both cast by adopting a graphene composite ceramic material.
The invention also provides a fire extinguishing device which comprises a fire-retardant valve core, a first shell and a second shell, wherein a mounting hole is jointly formed in one side of the first shell and one side of the second shell, the fire-retardant valve core is arranged inside the first shell and the second shell, a first mounting block and a second mounting block are arranged in the mounting hole, the electronic tag handball is arranged on the outer sides of the first shell and the second shell, first convex blocks are symmetrically welded at the bottom of the first shell, second fastening bolts are connected onto the first convex blocks through bolts, second convex blocks are symmetrically welded at the top of the second shell, the second convex blocks are fixedly connected with the first convex blocks through the second fastening bolts, a vent pipe is communicated with the bottom of the second shell, and a clamp is arranged on the vent pipe.
Preferably, a second nut is connected to the other end of the second fastening bolt in a threaded manner, and the second nut is arranged on the outer side of the second fastening bolt.
Preferably, the bottom of the first housing is provided with a first groove for fixing the first connecting block and the first fastening bolt, and the top of the second housing is provided with a second groove for fixing the second connecting block and the first nut.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, after the first shaft sleeve and the second shaft sleeve are connected, the first connecting block and the second connecting block are fixedly connected through the first fastening bolt, so that the stability of connection between the first valve core and the second valve core is increased, and the connection is firmer.
(2) According to the invention, one end of the limiting rod is moved out of the fixing hole by pulling the limiting rod, and the electronic tag handball can be moved out of the positioning hole, so that the electronic tag handball is convenient to disassemble and replace.
(3) According to the invention, the fire-retardant valve core is placed between the first shell and the second shell, the first mounting block and the second mounting block are positioned in the mounting hole, then the first shell and the second shell can be folded, and the first protruding block and the second protruding block are fixedly connected through the second fastening bolt, so that the fire-retardant valve core is conveniently mounted in the first shell and the second shell, and the use is convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;
FIG. 3 is a cross-sectional internal view of the first and second valve spools of FIG. 1 of the present invention;
FIG. 4 is a schematic structural view of the intermediate impeller of FIG. 3 in accordance with the present invention;
FIG. 5 is a schematic view of the fire suppression apparatus of the present invention;
fig. 6 is an internal cross-sectional view of fig. 5 of the present invention.
In the figure: 1. a first valve spool; 2. a second valve core; 3. an electronic tag handball; 4. a first connection block; 5. a second connecting block; 6. a first fastening bolt; 7. a first bushing; 8. a second shaft sleeve; 9. a middle impeller; 10. a rotating groove; 11. a first mounting block; 12. a second mounting block; 13. positioning holes; 14. a connecting rod; 15. a fixing hole; 16. a fixed block; 17. a limiting rod; 18. a cavity; 19. a spring; 20. a first side hole; 21. a second side hole; 22. a first nut; 23. a pull ring; 24. a first housing; 25. a second housing; 26. mounting holes; 27. a first bump; 28. a second fastening bolt; 29. a second bump; 30. a breather pipe; 31. clamping a hoop; 32. a second nut.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention is explained as follows:
example 1
Providing a technical scheme that: a fire-retardant valve core of a motor vehicle exhaust spark extinguisher comprises a first valve core 1, a second valve core 2 and an electronic tag handball 3, wherein the electronic tag handball 3 is used for writing information of a production unit and fireproof performance parameters of the fire-retardant valve core, and is convenient for a user to identify the product, first connecting blocks 4 are integrally formed on two sides of the first valve core 1, second connecting blocks 5 are integrally formed on two sides of the second valve core 2, a first fastening bolt 6 is in threaded connection with the first connecting blocks 4, the first connecting blocks 4 and the second connecting blocks 5 are fixedly connected through the first fastening bolt 6, a first shaft sleeve 7 is arranged at the top of the first valve core 1, a second shaft sleeve 8 is arranged at the bottom of the second valve core 2, the bottom of the first shaft sleeve 7 is in threaded connection with the top of the second shaft sleeve 8, a middle impeller 9 is rotatably arranged on the outer sides of the first shaft sleeve 7 and the second shaft sleeve 8, a rotating groove 10 is jointly arranged inside the first valve core 1 and the second valve core 2, middle impeller 9 rotates and sets up in rotating groove 10, one side integrated into one piece of first case 1 has first installation piece 11, one side integrated into one piece of second case 2 has second installation piece 12, be provided with locating hole 13 between first installation piece 11 and the second installation piece 12 jointly, the fixed connecting rod 14 that is provided with in one side of electronic tags handball 3, the other end of connecting rod 14 is pegged graft in locating hole 13, fixed orifices 15 have been seted up to the other end surface symmetry of connecting rod 14, the surface of first installation piece 11 and second installation piece 12 all is fixed and is provided with fixed block 16, the inside slip of fixed block 16 is provided with gag lever post 17, the one end of gag lever post 17 is pegged graft in fixed orifices 15, cavity 18 has been seted up to the inside of fixed block 16, be provided with spring 19 in the cavity 18, spring 19 cup joints on gag lever post 17's circumference.
In order to facilitate air intake and increase the air intake effect, in this embodiment, preferably, an air intake hole is formed in the upper surface of the first valve core 1, a first side hole 20 is formed in the outer surface of the first valve core 1, and at least ten sets of the first side holes 20 are formed in the surface of the first valve core 1.
In order to facilitate air outlet and increase the air outlet effect, in this embodiment, preferably, the lower surface of the second valve core 2 is provided with an air outlet hole, the outer surface of the second valve core 2 is provided with a second side hole 21, and the second side hole 21 is provided with at least ten sets on the surface of the second valve core 2.
In order to increase the stability of the first fastening bolt 6, in the present embodiment, it is preferable that the other end of the first fastening bolt 6 is threadedly connected with a first nut 22, and the first nut 22 is disposed on the lower surface of the second connection block 5.
In order to apply the elastic force of the spring 19 to the limiting rod 17 and insert the limiting rod 17 into the positioning hole 13 more stably, in the embodiment, preferably, one end of the spring 19 is fixedly disposed on the circumference of the limiting rod 17, and the other end of the spring 19 is fixedly disposed on the inner wall of the cavity 18.
In order to facilitate pulling the limiting rod 17, in the embodiment, preferably, a pulling ring 23 is fixedly disposed at the other end of the limiting rod 17, and the pulling ring 23 is disposed at the outer side of the fixing block 16.
In order to increase the fire retarding effect of the intermediate impeller 9, in this embodiment, it is preferable that the intermediate impeller 9 is composed of 6 to 16 blades, and the inclination angle of each blade is 20 ° to 40 °.
In order to enable the first shaft sleeve 7 and the second shaft sleeve 8 to work stably in a high-temperature environment and increase the wear resistance, in this embodiment, it is preferable that the first shaft sleeve 7 and the second shaft sleeve 8 are both cast by using a graphene composite ceramic material.
Example 2
The difference with embodiment 1 is that a fire extinguishing apparatus is further provided, which includes a fire-retardant valve core, a first casing 24 and a second casing 25, a mounting hole 26 is commonly arranged on one side of the first casing 24 and one side of the second casing 25, the fire-retardant valve core is arranged inside the first casing 24 and the second casing 25, a rubber sealing ring can be arranged between the joint of the first casing 24 and the second casing 25 to prevent air leakage from the joint of the first casing 24 and the second casing 25, a first mounting block 11 and a second mounting block 12 are arranged in the mounting hole 26, an electronic tag handball 3 is arranged outside the first casing 24 and the second casing 25, a first bump 27 is symmetrically welded on the bottom of the first casing 24, a second fastening bolt 28 is bolted on the first bump 27, a second bump 29 is symmetrically welded on the top of the second casing 25, the second bump 29 and the first bump 27 are fixedly connected through the second fastening bolt 28, the bottom of the second housing 25 is provided with a vent pipe 30 in a communicating manner, and the vent pipe 30 is provided with a clamp 31.
In order to increase the stability of the second fastening bolt 28, in the present embodiment, it is preferable that the other end of the second fastening bolt 28 is threadedly connected with a second nut 32, and the second nut 32 is disposed outside the second fastening bolt 28.
In order to facilitate installation of the fire relief valve core, in this embodiment, it is preferable that the bottom of the first housing 24 is provided with a first groove for fixing the first connecting block 4 and the first fastening bolt 6, and the top of the second housing 25 is provided with a second groove for fixing the second connecting block 5 and the first nut 22.
The working principle of the invention is as follows: according to the invention, after the first shaft sleeve 7 and the second shaft sleeve 8 are connected, the first connecting block 4 and the second connecting block 5 are fixedly connected through the first fastening bolt 6, so that the stability of connection between the first valve core 1 and the second valve core 2 is increased, and the connection is firmer; one end of the limiting rod 17 is moved out of the fixing hole 15 by pulling the limiting rod 17, and the electronic tag handball 3 can be moved out of the positioning hole 13, so that the electronic tag handball 3 can be conveniently detached, and the electronic tag handball 3 can be conveniently replaced; by placing the fire relief valve core between the first shell 24 and the second shell 25 and positioning the first mounting block 11 and the second mounting block 12 in the mounting hole 26, the first shell 24 and the second shell 25 can be folded, and the first projection 27 and the second projection 29 are fixedly connected through the second fastening bolt 28, so that the fire relief valve core is conveniently mounted in the first shell 24 and the second shell 25, and the use is convenient.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (11)
1. The utility model provides a motor vehicle exhaust spark arrester back-fire relief case, includes first case (1), second case (2) and electronic tags handball (3), its characterized in that: the two sides of the first valve core (1) are integrally formed with first connecting blocks (4), the two sides of the second valve core (2) are integrally formed with second connecting blocks (5), the first connecting blocks (4) are in threaded connection with first fastening bolts (6), the first connecting blocks (4) are fixedly connected with the second connecting blocks (5) through the first fastening bolts (6), a first shaft sleeve (7) is arranged at the top of the first valve core (1), a second shaft sleeve (8) is arranged at the bottom of the second valve core (2), the bottom of the first shaft sleeve (7) is in threaded connection with the top of the second shaft sleeve (8), a middle impeller (9) is rotatably arranged on the outer sides of the first shaft sleeve (7) and the second shaft sleeve (8), and a rotating groove (10) is jointly arranged inside the first valve core (1) and the second valve core (2), the middle impeller (9) is rotatably arranged in the rotating groove (10), a first mounting block (11) is integrally formed on one side of the first valve core (1), a second mounting block (12) is integrally formed on one side of the second valve core (2), a positioning hole (13) is formed between the first mounting block (11) and the second mounting block (12), a connecting rod (14) is fixedly arranged on one side of the electronic tag handball (3), the other end of the connecting rod (14) is inserted into the positioning hole (13), fixing holes (15) are symmetrically formed in the outer surface of the other end of the connecting rod (14), fixing blocks (16) are fixedly arranged on the outer surfaces of the first mounting block (11) and the second mounting block (12), a limiting rod (17) is slidably arranged inside the fixing blocks (16), and one end of the limiting rod (17) is inserted into the fixing hole (15), a cavity (18) is formed in the fixing block (16), a spring (19) is arranged in the cavity (18), and the spring (19) is sleeved on the circumference of the limiting rod (17).
2. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: an air inlet is formed in the upper surface of the first valve core (1), a first side hole (20) is formed in the outer surface of the first valve core (1), and at least ten groups of the first side hole (20) are arranged on the surface of the first valve core (1).
3. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: the lower surface of the second valve core (2) is provided with an air outlet, the outer surface of the second valve core (2) is provided with a second side hole (21), and at least ten groups of the second side holes (21) are arranged on the surface of the second valve core (2).
4. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: the other end of the first fastening bolt (6) is in threaded connection with a first nut (22), and the first nut (22) is arranged on the lower surface of the second connecting block (5).
5. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: one end of the spring (19) is fixedly arranged on the circumference of the limiting rod (17), and the other end of the spring (19) is fixedly arranged on the inner wall of the cavity (18).
6. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: the other end of the limiting rod (17) is fixedly provided with a pull ring (23), and the pull ring (23) is arranged on the outer side of the fixing block (16).
7. The fire-retardant valve core and the fire-extinguishing device of the motor vehicle exhaust spark arrester as claimed in claim 1, wherein: the middle impeller (9) is composed of 6-16 blades, and the inclination angle of each blade is 20-40 degrees.
8. A motor vehicle exhaust spark arrester fire arrestor valve cartridge as defined in claim 1, wherein: the first shaft sleeve (7) and the second shaft sleeve (8) are both cast by adopting a graphene composite ceramic material.
9. A fire suppression apparatus comprising the fire relief valve cartridge of any of claims 1-8, wherein: the flame retardant electromagnetic valve further comprises a first shell (24) and a second shell (25), a mounting hole (26) is formed in one side of the first shell (24) and one side of the second shell (25) jointly, the flame retardant valve core is arranged in the first shell (24) and the second shell (25), a first mounting block (11) and a second mounting block (12) are arranged in the mounting hole (26), the electronic tag handball (3) is arranged on the outer sides of the first shell (24) and the second shell (25), a first convex block (27) is symmetrically welded at the bottom of the first shell (24), a second fastening bolt (28) is connected onto the first convex block (27) through a bolt, a second convex block (29) is symmetrically welded at the top of the second shell (25), and the second convex block (29) is fixedly connected with the first convex block (27) through the second fastening bolt (28), the bottom of second casing (25) intercommunication is provided with breather pipe (30), be provided with clamp (31) on breather pipe (30).
10. A fire extinguishing apparatus according to claim 9, wherein: the other end of the second fastening bolt (28) is in threaded connection with a second nut (32), and the second nut (32) is arranged on the outer side of the second fastening bolt (28).
11. A fire extinguishing apparatus according to claim 9, wherein: the bottom of the first shell (24) is provided with a first groove for fixing the first connecting block (4) and the first fastening bolt (6), and the top of the second shell (25) is provided with a second groove for fixing the second connecting block (5) and the first nut (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010552958.7A CN111749763A (en) | 2020-06-17 | 2020-06-17 | Fire-retardant valve core of motor vehicle exhaust spark extinguisher and fire extinguishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010552958.7A CN111749763A (en) | 2020-06-17 | 2020-06-17 | Fire-retardant valve core of motor vehicle exhaust spark extinguisher and fire extinguishing device |
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| Publication Number | Publication Date |
|---|---|
| CN111749763A true CN111749763A (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010552958.7A Pending CN111749763A (en) | 2020-06-17 | 2020-06-17 | Fire-retardant valve core of motor vehicle exhaust spark extinguisher and fire extinguishing device |
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| Country | Link |
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| CN (1) | CN111749763A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170099996A1 (en) * | 2015-03-16 | 2017-04-13 | Zhejiang Novia Industry & Trade Co., Ltd | Dismountable hand grip |
| CN207470760U (en) * | 2017-12-01 | 2018-06-08 | 富诚汽车零部件武汉有限公司 | A kind of connecting structure for just dismantling automobile gear shift handball and gear level |
| CN208164672U (en) * | 2018-04-02 | 2018-11-30 | 四川赢信汇通实业有限公司 | A kind of automobile drive axle housing convenient for being welded and fixed |
| CN111140315A (en) * | 2020-03-03 | 2020-05-12 | 王明文 | Motor vehicle exhaust spark extinguisher and fire-retardant valve core |
-
2020
- 2020-06-17 CN CN202010552958.7A patent/CN111749763A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170099996A1 (en) * | 2015-03-16 | 2017-04-13 | Zhejiang Novia Industry & Trade Co., Ltd | Dismountable hand grip |
| CN207470760U (en) * | 2017-12-01 | 2018-06-08 | 富诚汽车零部件武汉有限公司 | A kind of connecting structure for just dismantling automobile gear shift handball and gear level |
| CN208164672U (en) * | 2018-04-02 | 2018-11-30 | 四川赢信汇通实业有限公司 | A kind of automobile drive axle housing convenient for being welded and fixed |
| CN111140315A (en) * | 2020-03-03 | 2020-05-12 | 王明文 | Motor vehicle exhaust spark extinguisher and fire-retardant valve core |
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Application publication date: 20201009 |
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