CN114526383A - Refrigerant conveying pipe of air conditioner for vehicle - Google Patents
Refrigerant conveying pipe of air conditioner for vehicle Download PDFInfo
- Publication number
- CN114526383A CN114526383A CN202210183907.0A CN202210183907A CN114526383A CN 114526383 A CN114526383 A CN 114526383A CN 202210183907 A CN202210183907 A CN 202210183907A CN 114526383 A CN114526383 A CN 114526383A
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- China
- Prior art keywords
- pipe
- seepage
- air conditioner
- layer
- composite rubber
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
- F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
- F16L13/0281—Welded joints cold welded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The utility model provides a vehicle air conditioner refrigerant conveyer pipe, includes tubulose barrier layer, inoxidizing coating, be equipped with the metal enhancement layer in the middle of barrier layer, the inoxidizing coating and form multilayer composite rubber pipe jointly, the metal anti-seepage pipe has been cup jointed in the barrier layer, the pipe wall wave form of anti-seepage pipe extends, the both ends of anti-seepage pipe are equipped with respectively with the coupling, multilayer composite rubber pipe cladding to the coupling middle part at anti-seepage pipe both ends. Stainless steel is used as a seepage-proof pipe, and the permeation of CO2 can be blocked by a compact crystal structure; the pipe wall of the anti-seepage pipe is in a wave shape, so that the pipe can be bent at a large angle, the anti-seepage pipe cannot be damaged, and the pipe distribution is convenient; winding a metal wire as a reinforcing layer to ensure that the conveying pipe can bear ultrahigh pressure; the multilayer composite rubber pipe is sleeved on the anti-seepage pipe through a sleeving process, so that the pipe joint can be welded on the anti-seepage pipe in advance, the integral safety of the conveying pipe is ensured, and the fact that the air conditioner in the electric automobile industry uses CO2 as a refrigerant is realized.
Description
Technical Field
The invention relates to the technical field of vehicle air conditioners, in particular to a refrigerant conveying pipe of a vehicle air conditioner, and particularly relates to a refrigerant conveying pipe for an electric vehicle air conditioner.
Background
In the prior art, for example, a utility model patent with publication number CN208735028U, which is announced by the national patent office in 2019, No. 4, month 12, is a multi-layer environment-friendly air-conditioning tube for vehicles, wherein a tube body is respectively provided with an inner glue layer, a middle glue layer, an enhancement layer, an outer glue layer, a ventilation layer and a wrapping layer from inside to outside, and adjacent layers of the inner glue layer, the middle glue layer, the enhancement layer, the outer glue layer, the ventilation layer and the wrapping layer are matched with each other to connect six layers into a whole; the inner rubber layer is made of compact rubber, and the inner surface of the inner rubber layer is smooth; the middle rubber layer is made of polymer rubber materials in a foaming mode, and a plurality of bubbles are clamped in the middle rubber layer; the reinforced layer is formed by interlacing glass fibers in a net shape; the outer rubber layer is made of compact rubber, and the surface is smooth; a plurality of arch grooves which are arranged along the axial direction are distributed on the matching surface of the ventilation layer and the outer rubber layer; the ventilation layer and the outer rubber layer are matched through the arch-shaped grooves to form a plurality of arch-shaped air guide channels; the wrapping layer is wrapped outside the ventilation layer.
With the development of the times and the social progress, people pay more and more attention to the environmental problems. The development of electric vehicles is strongly advocated by the nation due to the double consideration of energy safety strategy and environmental protection. Along with the prosperity of the articles in the electric automobile industry, it has raised the environmental protection requirement for the air conditioner of vehicle. As the substances usable as the refrigerant for air conditioners, ammonia gas, chlorofluorocarbons (e.g., Freon), and CO are known2The ammonia gas is toxic, corrosive and causes accidents if leaked, the chlorofluorocarbon has strong greenhouse effect and can damage the ozone layer on which people live, and the CO2 has the advantages of high density, low viscosity, no pollution, small flow loss, good heat transfer effect, easiness in obtaining, low cost, good stability, contribution to reducing the volume of a refrigerating device and the like, so that the CO2 becomes the optimal choice of the refrigerant, but the CO2 also has the defects of low molecular weight, easiness in leakage, relatively high critical pressure and low critical temperature, and provides higher requirements for a conveying pipe for conveying the refrigerant by the air conditioner, and the vehicle air conditioner pipe in the prior art does not meet the requirements, thereby restricting the use of the CO2 as the refrigerant. For electric automobiles, the advantages of no pollution of CO2 and capability of reducing the volume of a refrigerating device are attractive, so that the demand for using CO2 as a refrigerant in the electric automobile industry is extremely high.
Disclosure of Invention
In order to overcome the defects, the technical problems to be solved by the invention are as follows: the refrigerant conveying pipe for the vehicle air conditioner can overcome the leakage of CO2 molecules, bear the ultrahigh pressure of CO2 compression and be conveniently shaped to adapt to the pipe arrangement in a compact environment.
The technical scheme for solving the problems in the prior art is as follows: the utility model provides a vehicle air conditioner refrigerant conveyer pipe, includes tubulose barrier layer and the inoxidizing coating of cladding at the barrier layer periphery side, the enhancement layer that the barrier layer, inoxidizing coating were equipped with the wire and weave and form multilayer composite rubber pipe jointly, the prevention of seepage pipe that the metal was made is cup jointed in the barrier layer, the pipe wall axial of prevention of seepage pipe is the wave form and extends, the both ends of prevention of seepage pipe are equipped with the coupling that matches with vehicle air conditioning system respectively, multilayer composite rubber pipe cladding is to the coupling middle part at prevention of seepage pipe both ends. Because the crystal structure of the metal is very compact, the anti-seepage pipe made of the metal has better anti-seepage function, and even CO2 with lower molecular weight is difficult to leak; the anti-seepage pipe extends along the axial waveform, so that the anti-seepage pipe can be conveniently bent at any angle as required in a compact environment of the electric automobile, the bent inner side wave trough of the anti-seepage pipe is close to (or pulled away), and the outer side wave crest of the anti-seepage pipe is pulled away (close to), so that the surface of the anti-seepage pipe cannot be damaged and deformed no matter how the anti-seepage pipe is bent, and the reliability of the mechanical performance of the anti-seepage pipe is ensured; the pipe wall of the anti-seepage pipe extends along the axial direction in a wave shape to absorb a large amount of vibration energy, so that the noise generated by vibration when a vehicle starts can be reduced; because the reinforcing layer woven by the metal wires is arranged in the multilayer composite rubber pipe, the reinforcing layer can powerfully support the anti-seepage pipe, and the anti-seepage pipe can bear the ultrahigh pressure of CO2 compression; because the multilayer composite rubber pipe containing the reinforcing layer is sleeved on the outer peripheral side of the anti-seepage pipe through a sleeving process, the anti-seepage pipe can be welded with pipe joints matched with an air conditioning system for a vehicle at two ends in advance according to the actual required length, so that the multilayer composite rubber pipe can respectively cover the middle parts of the pipe joints at the two ends during subsequent sleeving, and the connection fastness between the anti-seepage pipe and the pipe joints is ensured. If the multilayer composite rubber pipe is directly extruded on the outer surface of the anti-seepage pipe through an extruder process, the anti-seepage pipe cannot be welded with the pipe joint in advance, the multilayer composite rubber pipe is extruded on the outer peripheral side of the anti-seepage pipe and then welded and connected after a part of the multilayer composite rubber pipe is stripped at the two ends of the anti-seepage pipe, so that the outer surface of the anti-seepage pipe is inevitably damaged when the multilayer composite rubber pipe is stripped by a knife, the mechanical strength of the anti-seepage pipe is reduced, on the other hand, the multilayer composite rubber pipe cannot cover the pipe joint and the welding position of the pipe joint, the anti-seepage pipe and the welding position exposed at the outer side of the multilayer composite rubber pipe become weak links, the ultra-high pressure of CO2 compression is difficult to bear, and the process requirement that CO2 is a refrigerant conveying pipe cannot be met.
As a further technical scheme, the outer diameter of the anti-seepage pipe is 0.01 to 0.1mm larger than the inner diameter of the barrier layer. When the interference magnitude between the anti-seepage pipe and the barrier layer is between 0.01mm and 0.03mm, a cold sleeving process can be implemented for sleeving; when the interference magnitude between the anti-seepage pipe and the barrier layer is between 0.03mm and 0.1mm, a hot sleeving process can be implemented for sleeving; the multilayer composite rubber pipe is sleeved on the outer peripheral side of the anti-seepage pipe through a sleeving process, and due to interference fit between the anti-seepage pipe and the multilayer composite rubber pipe, the multilayer composite rubber pipe can apply pre-tightening force to the anti-seepage pipe, so that the conveying pipe is ensured to be durable on the premise of safely bearing ultrahigh pressure of CO2 compression.
As a further technical scheme, the outer diameter of the anti-seepage pipe is 0.01 to 0.03mm larger than the inner diameter of the barrier layer. When the interference magnitude between the anti-seepage pipe and the barrier layer is larger than 0.03mm, only a hot-splicing process can be selected. The hot-splicing process has some disadvantages: 1. the multilayer composite rubber pipe of the hot-sleeving process needs heating and cooling processes, so that the time and energy consumption are more, and the manufacturing cost is increased; 2. the rubber tube with higher temperature can generate harmful gas, which is not beneficial to the health of workers; 3. the hidden danger that operating personnel can be scalded exists when the rubber pipe with higher temperature is sleeved; 4. the too large interference magnitude can greatly increase the resistance of the anti-seepage pipe when the wave crest moves, and is not beneficial to bending and shaping of the anti-seepage pipe. Therefore, the invention preferably selects a cold-socketing process, namely, the cold-socketing process is characterized in that one end of the traction piece is connected with the outer end part of the pipe joint at one end of the anti-seepage pipe, the outer diameter of the anti-seepage pipe which extends in an axial wave shape is retracted through external force traction, so that the anti-seepage pipe can penetrate through the multilayer composite rubber pipe, and after the external force disappears, the anti-seepage pipe is reset under the action of elasticity, thereby realizing the interference fit of the cold-socketing process. The anti-seepage pipe is made of stainless steel materials, the elastic deformation is limited, and in order to ensure that the anti-seepage pipe can be successfully reset after the external drawing force disappears, the interference range is selected to be between 0.01 and 0.03 mm.
As a further technical scheme, the inner wall of the multilayer composite rubber pipe is made of a nylon material. The damping coefficient of the nylon material is smaller than that of rubber, and the nylon material is compounded to the inner wall of the multilayer composite rubber pipe, so that the sleeving between the anti-seepage pipe and the multilayer composite rubber pipe and the bending and shaping of the anti-seepage pipe are facilitated.
As a further technical solution, the anti-seepage pipe may be made of copper or aluminum, and is made of stainless steel material. As the electric automobile inevitably contacts with weak corrosive substances such as rainwater infiltration in the use process, the 304 stainless steel material is used for manufacturing the anti-seepage pipe, so that the mechanical property of the anti-seepage pipe can be improved, and the service life of the anti-seepage pipe can be prolonged.
As a further technical scheme, the barrier layer is formed by mixing various rubbers with excellent oil resistance and high temperature resistance together with a binder, and then extruding and molding the mixture together with the nylon material by an extruder, wherein the nylon material is compounded on the inner wall of the barrier layer. Since the refrigerant conveying pipe for the vehicle air conditioner has high temperature and lubricating oil in the use environment, various rubbers with excellent oil resistance and high temperature resistance are required to be extruded and molded, and since the multi-layer composite rubber pipe needs to be tightly connected into a whole, a binder needs to be added during mixing.
As a further technical scheme, the anti-seepage pipe is formed by a stainless steel pipe through a hydraulic forming method, and the pipe wall of the anti-seepage pipe extends in an axial wave shape. The method for manufacturing the corrugated structure on the pipe wall of the anti-seepage pipe comprises mechanical forming, hydraulic forming, roll forming, welding forming and the like.
The invention has the beneficial effects that: 1. the 304 stainless steel material is used as the anti-seepage pipe, and the compact crystal structure can efficiently block the permeation of CO2 with low molecular weight; 2. the pipe wall of the anti-seepage pipe extends along the axial direction in a wave shape, so that the pipe is beneficial to bending in a large angle according to the actual environment requirement, meanwhile, the anti-seepage pipe is not damaged, and the pipe distribution in a compact environment of the electric automobile is convenient; 3. a reinforcing layer made of metal materials is arranged in the middle of the multi-layer composite rubber pipe, so that the refrigerant conveying pipe of the vehicle air conditioner can bear ultrahigh pressure; 4. the multi-layer composite rubber pipe with the reinforcing layer is sleeved on the outer peripheral side of the anti-seepage pipe through a cold sleeving process, so that the pipe joint can be welded on the anti-seepage pipe in advance, and the whole vehicle air conditioner refrigerant conveying pipe can bear ultrahigh pressure.
The beneficial effects enable the air conditioner in the electric automobile industry to use CO2 as the refrigerant.
Drawings
FIG. 1 is a schematic cross-sectional view of one configuration of the present invention;
fig. 2 is an enlarged schematic view of the R portion in fig. 1.
In the figure: 1: pipe joint, 2: buckle, 3: protective layer, 4: reinforcing layer, 5: anti-seepage pipe, 6: and a barrier layer.
Detailed Description
The invention is further illustrated by the following specific examples in conjunction with the accompanying drawings.
Example (b): a refrigerant conveying pipe of a vehicle air conditioner, as shown in fig. 1 and fig. 2, the first step is as follows: manufacturing a 304 stainless steel pipe into a fixed-length anti-seepage pipe 5 according to a required length by a hydraulic forming method, and enabling the pipe wall of the anti-seepage pipe 5 to axially extend in a wave shape; the second step is that: the inner side and the outer side of the two ends of the anti-seepage pipe 5 are respectively welded with pipe joints 1 matched with an air conditioning system for a vehicle; the third step: mixing various excellent oil-resistant and high-temperature-resistant rubbers with a binder, extruding the mixture and a nylon material into a tubular barrier layer 6 by using an extruder, compounding the nylon material on the inner wall of the barrier layer 6, and monitoring the inner diameter of the barrier layer 6 by using a caliper to ensure that the inner diameter of the barrier layer 6 is 0.01-0.03 mm smaller than the outer diameter of the anti-seepage pipe 5; the fourth step: after the temperature of the blocking layer 6 is cooled, winding a high-strength metal wire on the periphery of the blocking layer 6 to serve as a reinforcing layer 4; the fifth step: extruding a protective layer 3 from the oil-resistant and high-temperature-resistant rubber on the outer peripheral side of the reinforcing layer 4 by using an extruder, wherein the reinforcing layer 4 is coated by the protective layer 3; and a sixth step: vulcanizing the blocking layer 6 and the protective layer 3 to bond the blocking layer 6, the reinforcing layer 4 and the protective layer 3 into a whole under the self-bonding action, thereby forming a multilayer composite rubber pipe; the seventh step: shearing the multilayer composite rubber pipe into a fixed-length multilayer composite rubber pipe according to the required length, and the eighth step: connecting one end of a traction piece to the outer end part of one pipe joint 1 in the anti-seepage pipe 5 prepared in the second step, and then drawing the traction piece to enable the fixed-length multilayer composite rubber pipe to be sleeved on the outer peripheral side of the anti-seepage pipe 5 prepared in the second step, wherein two ends of the fixed-length multilayer composite rubber pipe just cover the middle parts of the pipe joints 1 at two ends; the ninth step: and riveting the buckles 2 at the two ends of the fixed-length multilayer composite rubber pipe by using a pressing machine, so that the two ends of the fixed-length multilayer composite rubber pipe and the pipe joint 1 are riveted into a whole.
The above embodiment is the basic structure of the refrigerant conveying pipe of the vehicle air conditioner, and on this basis, a plurality of layers such as a plastic barrier layer, a polymer material barrier layer and the like can be compounded on the multilayer compound rubber pipe according to the requirement.
The above-described embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Details not described in the present specification belong to the prior art known to those skilled in the art.
Claims (7)
1. The refrigerant conveying pipe for the vehicle air conditioner comprises a tubular blocking layer and a protective layer coated on the periphery of the blocking layer, and is characterized in that a reinforcing layer woven by metal wires is arranged between the blocking layer and the protective layer and forms a multilayer composite rubber pipe together, an anti-seepage pipe made of metal is sleeved in the blocking layer, the axial direction of the pipe wall of the anti-seepage pipe is in wave shape extension, pipe joints matched with a vehicle air conditioning system are arranged at two ends of the anti-seepage pipe respectively, and the multilayer composite rubber pipe is coated to the middle of the pipe joints at two ends of the anti-seepage pipe.
2. The refrigerant conveying pipe for an air conditioner of a vehicle as claimed in claim 1, wherein an outer diameter of the leakage-proof pipe is 0.01 to 0.1mm larger than an inner diameter of the barrier layer.
3. The refrigerant conveying pipe for an air conditioner of claim 2, wherein the outer diameter of the anti-leakage pipe is 0.01 to 0.03mm larger than the inner diameter of the barrier layer.
4. The refrigerant conveying pipe for the vehicle air conditioner according to claim 1, 2 or 3, wherein the inner wall of the multi-layer composite rubber pipe is made of a nylon material.
5. The refrigerant conveying pipe of an air conditioner for a vehicle as claimed in claim 1, 2 or 3, wherein the anti-leakage pipe is made of stainless steel material.
6. The duct for conveying refrigerant of air conditioner for vehicle as claimed in claim 4, wherein the barrier layer is formed by mixing various rubbers with excellent oil resistance and high temperature resistance together with a binder, and then extruding the mixture with the nylon material through an extruder, wherein the nylon material is compounded on the inner wall of the barrier layer.
7. The refrigerant conveying pipe for the vehicle air conditioner as claimed in claim 1, 2 or 3, wherein the anti-leakage pipe is formed by a stainless steel pipe through a hydroforming process, and the pipe wall extends in an axial wave shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210183907.0A CN114526383A (en) | 2022-02-28 | 2022-02-28 | Refrigerant conveying pipe of air conditioner for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210183907.0A CN114526383A (en) | 2022-02-28 | 2022-02-28 | Refrigerant conveying pipe of air conditioner for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114526383A true CN114526383A (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210183907.0A Pending CN114526383A (en) | 2022-02-28 | 2022-02-28 | Refrigerant conveying pipe of air conditioner for vehicle |
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| CN (1) | CN114526383A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340473A (en) * | 2018-10-25 | 2019-02-15 | 南京利德东方橡塑科技有限公司 | A kind of wavy metal air-conditioner pipe and preparation method thereof meeting novel refrigerant |
| CN208735028U (en) * | 2018-06-19 | 2019-04-12 | 衡水佰力橡胶制品有限公司 | Multilayer environment protecting car air-conditioner pipe |
| CN209743846U (en) * | 2019-01-30 | 2019-12-06 | 上海众源燃油分配器制造有限公司 | High-pressure soft and hard pipeline connection sealing system |
| CN111594683A (en) * | 2020-04-23 | 2020-08-28 | 宁波福士汽车部件有限公司 | Carbon dioxide automobile air conditioner high-pressure pipeline |
| CN214466760U (en) * | 2021-03-24 | 2021-10-22 | 陕西裕华永赫航宇科技有限公司 | Composite hose assembly for conveying high-pressure steam |
-
2022
- 2022-02-28 CN CN202210183907.0A patent/CN114526383A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208735028U (en) * | 2018-06-19 | 2019-04-12 | 衡水佰力橡胶制品有限公司 | Multilayer environment protecting car air-conditioner pipe |
| CN109340473A (en) * | 2018-10-25 | 2019-02-15 | 南京利德东方橡塑科技有限公司 | A kind of wavy metal air-conditioner pipe and preparation method thereof meeting novel refrigerant |
| CN209743846U (en) * | 2019-01-30 | 2019-12-06 | 上海众源燃油分配器制造有限公司 | High-pressure soft and hard pipeline connection sealing system |
| CN111594683A (en) * | 2020-04-23 | 2020-08-28 | 宁波福士汽车部件有限公司 | Carbon dioxide automobile air conditioner high-pressure pipeline |
| CN214466760U (en) * | 2021-03-24 | 2021-10-22 | 陕西裕华永赫航宇科技有限公司 | Composite hose assembly for conveying high-pressure steam |
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