CN110206648B - Vibration damping supporting device and turboshaft engine - Google Patents
Vibration damping supporting device and turboshaft engine Download PDFInfo
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- CN110206648B CN110206648B CN201910470691.4A CN201910470691A CN110206648B CN 110206648 B CN110206648 B CN 110206648B CN 201910470691 A CN201910470691 A CN 201910470691A CN 110206648 B CN110206648 B CN 110206648B
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- long pipe
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- sleeve opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/20—Mounting or supporting of plant; Accommodating heat expansion or creep
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a vibration reduction supporting device and a turboshaft engine, wherein the vibration reduction supporting device is used for supporting and reducing vibration of a long pipe part in the engine and comprises a supporting body, and the supporting body comprises: the supporting mechanism is used for inserting the long pipe and surrounding the outer wall surface of the long pipe to generate damping and vibration attenuation effects on the long pipe; the wall surface of the supporting mechanism contacting with the long pipe adopts a curved surface structure with elastic support. According to the vibration reduction supporting device, the curved surface structure provides internal support for the long pipe fixed outside the casing, meanwhile, the curved surface structure with the elastic support has certain damping force on the long pipe, the direction of the damping force is opposite to the direction of the vibration speed of the long pipe, and the damping force has the effect of blocking the movement of the long pipe, so that the kinetic energy of the vibration of the long pipe is converted into heat energy to be dissipated, the vibration of the long pipe can be effectively controlled, and finally, the damping vibration reduction effect is generated.
Description
Technical Field
The invention relates to the field of turboshaft engines, in particular to a vibration reduction supporting device. In addition, the invention also relates to a turboshaft engine comprising the vibration reduction supporting device.
Background
When a long pipe part in an engine works, the speed of air flow (lubricating oil) in a pipeline is high, the pressure of gas (lubricating oil) is high, the vibration problem of the long pipe part is prominent, and the stable and reliable work of a gas turbine engine casing, a bearing seat and the like is influenced. The vibration problem to the inner long tube often causes the fastening structure such as the screw connection to loosen after a long working time, so that the vibration of the long tube is increased, gas leakage or oil leakage is caused, and the safety and the working of the gas turbine engine casing and the bearing seat are endangered. In order to solve the above problems, a long pipe led to the inside is not provided with a vibration damping support structure corresponding to the long pipe inside or is provided with a structure for fixing the long pipe inside, and the structure relatively reduces the vibration of the long pipe inside, but the vibration is still relatively large compared with the requirement of the service life of the part on the vibration. On the other hand, such long pipe parts, which are used as a path to the air flow or oil inside the engine, have very high requirements on life strength. If the strength life of the part is reduced, it can have a greater impact on the bearing housing or case life of the gas turbine engine. If the supporting mode is not available or only the fixing function can be provided in the inner part, the damping effect is not obvious, and the device is only suitable for the parts with low requirements on vibration.
Disclosure of Invention
The invention provides a vibration reduction supporting device and a turboshaft engine, which aim to solve the technical problems that the existing supporting mode of a long pipe leading to the inside can only provide a fixed single function, when the long pipe leading to a bearing seat vibrates greatly in the inside, the traditional supporting mode can not meet the use requirement, and the service life of the long pipe is influenced to a certain extent.
The technical scheme adopted by the invention is as follows:
a vibration damping support device for supporting and damping long pipe parts in an engine, comprising a support body comprising: the supporting mechanism is used for inserting the long pipe and surrounding the outer wall surface of the long pipe to generate damping and vibration attenuation effects on the long pipe; the wall surface of the supporting mechanism contacting with the long pipe adopts a curved surface structure with elastic support.
Furthermore, the supporting mechanism adopts a supporting sleeve opening formed by bending a local base body of the supporting body to the outer side to enclose the baffle; or the supporting mechanism adopts a supporting body which is provided with a through hole for inserting the long pipe, and a flange extending outwards along the circumferential direction of the through hole encloses and blocks a supporting sleeve opening.
Furthermore, the width of the plate body around the supporting sleeve opening is at least 1 mm; the length of the supporting sleeve opening is 5 mm-10 mm.
Furthermore, the supporting sleeve opening adopts an elastic ring, and a supporting point of a second elastic support is distributed on the curved surface structure to generate a damping effect; or the supporting sleeve opening adopts an elastic ring, and the outer wall surface of the elastic ring is provided with a plurality of second elastic supports to generate a damping effect; or the support sleeve opening adopts at least two layers of structures, the first layer is a contact layer with an elastic support curved surface structure, and the second layer is an elastic damping layer; or the support sleeve opening is formed by combining materials with different elastic deformation amounts; or the support sleeve opening adopts a deformation support sleeve opening with the thickness changing along the circumferential direction.
Further, the support sleeve opening is in interference fit with the long pipe; the interference range is 0.05 mm-0.5 mm.
Furthermore, the free end of the supporting sleeve opening is provided with a vibration damping gap for increasing the elastic deformation of the curved surface structure of the supporting sleeve opening and facilitating the insertion of the long pipe; one damping gap is arranged; or a plurality of vibration reduction gaps are arranged at equal intervals at the supporting sleeve opening.
Further, the mounting mechanism comprises a mounting edge extending axially outwardly along the free end of the support body; the mounting edge is provided with a locking piece which is used for being detachably connected with the casing and centering the support body.
Further, the mounting edge comprises a structural form in one of a circular arc shape, a rectangular shape, a triangular shape or a corrugated shape; the locking part adopts at least one of bolt locking, clamping locking or inserting locking.
Furthermore, a reinforcing convex rib for reinforcing the strength of the support body is arranged at the joint of the mounting mechanism and the support mechanism; the outer surface of the supporting body is attached with a protective layer for corrosion prevention and rust prevention.
According to another aspect of the invention, a turboshaft engine is further provided, which comprises the vibration damping support device, and a plurality of vibration damping support devices are arranged at intervals along the axial direction of the long pipe and fix the long pipe on the casing.
The invention has the following beneficial effects:
the vibration reduction supporting device comprises a supporting body and a supporting mechanism, wherein the supporting body comprises an installation mechanism and the supporting mechanism, the wall surface of the supporting mechanism, which is in contact with a long pipe, adopts a curved surface structure with elastic support, the curved surface structure provides internal support for a casing for the long pipe fixed outside, and meanwhile, the curved surface structure with the elastic support has certain damping force on the long pipe, the direction of the damping force is opposite to the direction of the vibration speed of the long pipe, and the damping force has the function of hindering the movement of the long pipe, so that the kinetic energy of the vibration of the long pipe is converted into heat energy to be dissipated, the vibration of the. In addition, the curved surface structure with the elastic support can be adjusted according to the working condition, the damage to the long pipe is reduced, and the service life of the long pipe is prolonged. The vibration reduction supporting device has the advantages of good assembly process, simple and light structure, high reliability and convenience in assembly and transportation.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic perspective view of a vibration damping support device according to a preferred embodiment of the present invention;
FIG. 2 is a top view of the vibration-damping support device in accordance with the preferred embodiment of the present invention;
FIG. 3 is a left side view of the vibration damping support device of the preferred embodiment of the present invention; and
fig. 4 is a sectional view schematically showing the vibration damping support device according to the preferred embodiment of the present invention.
Description of reference numerals:
1. a support body; 11. an installation mechanism; 111. installing edges; 112. a locking member; 12. a support mechanism; 121. supporting the looping; 122. and a vibration reduction notch.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic perspective view of a vibration damping support device according to a preferred embodiment of the present invention; FIG. 2 is a top view of the vibration-damping support device in accordance with the preferred embodiment of the present invention; FIG. 3 is a left side view of the vibration damping support device of the preferred embodiment of the present invention; fig. 4 is a sectional view schematically showing the vibration damping support device according to the preferred embodiment of the present invention.
As shown in fig. 1, the vibration damping support device of the present embodiment, which is used for supporting and damping long pipe parts in an engine, includes a support body 1, and the support body 1 includes: the mounting mechanism 11 is used for mounting the support body 1 on a casing of an engine and centering the support body 1, and the support mechanism 12 is used for inserting a long pipe and surrounding the outer wall surface of the long pipe to generate damping and vibration attenuation effects on the long pipe; the wall surface of the support mechanism 12 contacting the long pipe adopts a curved surface structure with elastic support. According to the vibration reduction supporting device, the supporting body 1 comprises the mounting mechanism 11 and the supporting mechanism 12, the wall surface of the supporting mechanism 12, which is in contact with the long pipe, is of the curved surface structure with elastic support, the curved surface structure provides internal support for the long pipe fixed outside the casing, meanwhile, the curved surface structure with elastic support has certain damping force on the long pipe, the direction of the damping force is opposite to the direction of the vibration speed of the long pipe, and the damping force has the effect of blocking the movement of the long pipe, so that the kinetic energy of the vibration of the long pipe is converted into heat energy to be dissipated, the vibration of the long pipe can be effectively controlled, and the. In addition, the curved surface structure with the elastic support can be adjusted according to the working condition, the damage to the long pipe is reduced, and the service life of the long pipe is prolonged. The vibration reduction supporting device has the advantages of good assembly process, simple and light structure, high reliability and convenience in assembly and transportation.
As shown in fig. 1 and 3, in the present embodiment, the supporting mechanism 12 employs a supporting sleeve opening 121 formed by bending a partial base body of the supporting body 1 to the outside and enclosing the supporting sleeve opening. Or, the supporting mechanism 12 adopts a supporting sleeve opening 121 formed by arranging a through hole for inserting a long pipe on the supporting body 1 and enclosing and blocking a flange extending outwards along the circumferential direction of the through hole. The supporting mechanism 12 adopts the supporting sleeve opening 121, on one hand, the impact resistance of the structure of the supporting sleeve opening 121 is stronger, and even after the long pipe is vibrated and deformed, a new balance state can be achieved through self structural adjustment, and the whole structure of the vibration damping supporting device is not influenced. On the other hand, the surface area of the support pocket 121 extending outward of the support body 1 is larger than the surface area of the planar structure, and the force and load generated by vibration can be dispersed, thereby improving the mechanical resistance. The direction of the supporting pocket 121 may be upward or downward with the supporting body 1 as a horizontal plane, or may be obliquely upward or downward. And a proper direction is conveniently selected according to the assembly space and the assembly process. Preferably, the support pocket 121 is employed in a direction facing upward with the support body 1 being horizontal.
In this embodiment, the width of the plate body around the supporting sleeve opening 121 is at least 1 mm. The length of the supporting sleeve opening 121 is 5 mm-10 mm. The width of the plate body around the supporting sleeve opening 121 is at least 1mm, namely, the vertical distance from the edge line of the inner wall surface of the plate body around the supporting sleeve opening 121 to the outer wall surface of the supporting sleeve opening 121 is not less than 1mm, so that the supporting sleeve opening 121 is prevented from being deformed or cracked due to long pipe vibration, and the numerical value of the specific vertical distance is determined according to the strength of different materials.
In this embodiment, the supporting sleeve opening 121 is an elastic ring, and a supporting point of the second elastic support is disposed on the curved surface structure to generate a damping effect. Alternatively, the supporting sleeve opening 121 is an elastic ring, and the outer wall surface of the elastic ring is provided with a plurality of second elastic supports to generate a damping effect. Or, the support cuff 121 adopts at least two layers of structures, the first layer is a contact layer with an elastically supported curved surface structure, and the second layer is an elastic damping layer. Alternatively, the support cuff 121 is formed of a combination of materials having different amounts of elastic deformation. Alternatively, the support pocket 121 may be a deformable support pocket having a thickness that varies in the circumferential direction. Preferably, the supporting sleeve opening 121 is an elastic ring, and three supporting points of the second elastic support are distributed on the curved surface structure. When the long pipe part works, the long pipe vibrates, the damping effect is generated on the wall surface of the long pipe through the synergistic effect of the elastic ring and the fulcrum on the supporting sleeve opening 121 to control the amplitude of the long pipe, and the long pipeThe vibration amplitude of the long pipe part cannot be increased due to the damping limitation of the elastic deformation of the curved surface of the supporting sleeve opening 121, so that the vibration reduction and supporting effects are achieved. The number of the supporting points of the second elastic support on the supporting sleeve opening 121 is correspondingly increased according to the diameters of different wall surfaces of the long pipe. The number n of the supporting points is determined according to the vibration stress generated when the long pipe works. Assuming that the resulting vibration stress is σzMaterial yield stress of σmaxIt is required that the stress borne by each pivot point on the curved surface structure of the supporting sleeve opening 121 does not exceed the yield stress of the corresponding material, namely sigmaz/n≤σmaxThe fulcrum is now in the elastic deformation phase. After the stress is unloaded, the elastically deformed part still recovers to the state without stress, namely, the springback phenomenon is generated, the self adjustment is carried out, and the service life of the self is prolonged.
In this embodiment, the support cuff 121 is in interference fit with the long tube. The interference range is 0.05 mm-0.5 mm. Above-mentioned support cuff 121 and long tube interference fit, insert in support cuff 121 at the long tube, the curved surface structure of support cuff 121 takes place elastic deformation for support cuff 121 better carries out the centre gripping to the long tube. The elastically deformed fulcrum generates a damping effect on the wall surface of the long pipe to limit the vibration of the long pipe.
As shown in fig. 1, 2 and 3, in the present embodiment, the free end of the supporting sleeve opening 121 is disposed with a damping notch 122 for increasing the elastic deformation of the curved surface structure of the supporting sleeve opening 121 and facilitating the insertion of the long tube. One damping indentation 122; alternatively, the plurality of damping notches 122 may be provided, and the plurality of damping notches 122 may be arranged at equal intervals in the support pocket 121. The vibration damping notch 122 enables the support sleeve opening 121 to have good assembly performance and increase elastic deformation, and is more beneficial to a long pipe to achieve the vibration damping effect and dissipate energy generated by vibration stress. Under the conditions of meeting the requirement of the bearing stress of the fulcrum and not influencing the resilience of the curved surface of the fulcrum, the number and the size of the vibration reduction notches 122 of the support sleeve opening 121 are determined according to the assembly process and the diameter of the support sleeve opening 121, and the vibration reduction notches 122 may be one vibration reduction notch 122 or a plurality of vibration reduction notches 122. When a plurality of damping notches 122 are provided, they are symmetrically or uniformly distributed in the support pocket 121.
As shown in fig. 1 and 4, in the present embodiment, the mounting mechanism 11 includes a mounting edge 111 extending axially outward along the free end of the support body 1. The mounting edge 111 is provided with a locking member 112 for detachable connection with the casing and centering the support body 1. Compared with the planar side installation of the support body 1, the installation side 111 and the casing are installed, acting force generated by long pipe vibration and gravity of the long pipe are distributed on the installation side 111 and the casing, the contact area between the installation side 111 and the casing is large, stress is dispersed, local overlarge stress is reduced, and abrasion between the installation side 111 and the casing is reduced. The installation mechanism 11 and the casing are locked and positioned by the locking member 112, and the circumferential position of the support sleeve opening 121 can be adjusted in the locking process of the locking member 112, so that the support sleeve opening 121 is concentric with the long pipe, and the maximum contact area of the support sleeve opening 121 and the long pipe is ensured.
In this embodiment, the mounting edge 111 includes one of a circular arc, a rectangular, a triangular or a corrugated configuration. The locking member 112 is at least one of bolted, snap, clamp, or plug. The shape of the mounting edge 111 is selectively varied to meet the requirements of different types of casings. In the arc shape, the rectangle shape, the triangle shape or the ripple shape, the stress area is larger when the device is installed, and the installation is more stable. The locking member 112 may be bolted, clamped or bayonet, or may be a combination of multiple types of locking, such as bolting and pinning the mounting edge 111 to the elongated tube. The middle of the mounting edge 111 is provided with a pin hole, and two ends of the pin hole are respectively provided with a bolt hole.
In this embodiment, a reinforcing rib for reinforcing the strength of the support body 1 is provided at the joint of the mounting mechanism 11 and the support mechanism 12. A protective layer for corrosion prevention and rust prevention is attached to the outer surface of the support body 1. Support body 1 formula structure as an organic whole, structural span is great, and the load that supports body 1 wall and can bear is limited, has laid at installation mechanism 11 and supporting mechanism 12 junction and has strengthened protruding muscle, under the condition that does not increase support body 1 wall thickness, increases support body 1's intensity and rigidity, overcomes the problem of support body 1 because of the uneven deformation that causes of stress that the wall thickness difference brought, and material saving alleviates support body 1 quality, reduce cost. The end of encorbelmenting of support cuff 121 strengthens or retrains, adopts the wall thickness or the strengthening rib that increase the end of encorbelmenting, avoids the end of encorbelmenting atress too big and outwards produces plastic deformation.
According to another aspect of the invention, a turboshaft engine is further provided, which comprises the vibration damping support device, and a plurality of vibration damping support devices are arranged at intervals along the axial direction of the long pipe and fix the long pipe on the casing. The inner part of the turboshaft engine comprises a vibration reduction supporting device, and a long pipe is stably fixed on a casing through the combination of a plurality of vibration reduction supporting devices to stably support the long pipe through which air flow or lubricating oil flows. The turboshaft engine is actually installed and used, the design requirements of the engine can be met through experiments, and the turboshaft engine is reasonable and feasible through practice experiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A vibration damping support device for supporting and damping long tubular parts in engines, characterized by comprising a support body (1), the support body (1) comprising:
a mounting mechanism (11) for mounting the support body (1) on a casing of the engine and centering the support body (1),
the supporting mechanism (12) is used for being inserted into the long pipe and surrounding the outer wall surface of the long pipe to generate damping and vibration attenuation effects on the long pipe, the supporting mechanism (12) adopts a supporting sleeve opening (121) formed by bending and blocking a local matrix of the supporting body (1) outwards, or the supporting mechanism (12) adopts a supporting sleeve opening (121), the supporting body (1) is provided with a through hole for being inserted into the long pipe, and a flange extending outwards along the circumferential direction of the through hole is blocked to form the supporting sleeve opening (121);
the length of the supporting sleeve opening (121) is 5-10 mm;
the wall surface of the support mechanism (12) in contact with the long pipe is of a curved surface structure with elastic support.
2. The vibration damping support device according to claim 1,
the width of the plate body around the supporting sleeve opening (121) is at least 1 mm.
3. The vibration damping support device according to claim 1,
the supporting sleeve opening (121) adopts an elastic ring, and a fulcrum of a second elastic support is distributed on the curved surface structure to generate a damping effect; or
The supporting sleeve opening (121) adopts an elastic ring, and the outer wall surface of the elastic ring is provided with a plurality of second elastic supports to generate a damping effect; or
The support sleeve opening (121) is of at least two layers, the first layer is a contact layer with an elastic support curved surface structure, and the second layer is an elastic damping layer; or
The supporting sleeve opening (121) is formed by combining materials with different elastic deformation amounts; or
The support sleeve opening (121) is a deformation support sleeve opening with the thickness changing along the circumferential direction.
4. The vibration damping support device according to claim 3,
the support sleeve opening (121) is in interference fit with the long pipe;
the interference range is 0.05 mm-0.5 mm.
5. The vibration damping support device according to claim 3,
the free end of the supporting sleeve opening (121) is provided with a vibration reduction notch (122) which is used for increasing the elastic deformation of the curved surface structure of the supporting sleeve opening (121) and facilitating the insertion of the long pipe;
the number of the vibration reduction notches (122) is one; or
The damping notches (122) are multiple, and the damping notches (122) are distributed at equal intervals in the supporting sleeve opening (121).
6. The vibration damping support device according to claim 1,
the mounting mechanism (11) comprises a mounting edge (111) extending axially outwards along the free end of the support body (1);
the mounting edge (111) is provided with a locking piece (112) which is used for being detachably connected with the casing and centering the support body (1).
7. The vibration damping support device according to claim 6,
the mounting edge (111) comprises a structural form in one of a circular arc shape, a rectangular shape, a triangular shape or a corrugated shape;
the locking piece (112) adopts at least one of bolt locking, clamping locking or inserting locking.
8. The vibration damping support device according to any one of claims 1 to 7,
a reinforcing convex rib for reinforcing the strength of the support body (1) is arranged at the joint of the mounting mechanism (11) and the support mechanism (12);
and a protective layer for corrosion prevention and rust prevention is attached to the outer surface of the support body (1).
9. A turboshaft engine comprising the vibration damping support device as claimed in any one of claims 1 to 8, wherein a plurality of the vibration damping support devices are arranged at intervals in the axial direction of a long pipe and fix the long pipe to a casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910470691.4A CN110206648B (en) | 2019-05-31 | 2019-05-31 | Vibration damping supporting device and turboshaft engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910470691.4A CN110206648B (en) | 2019-05-31 | 2019-05-31 | Vibration damping supporting device and turboshaft engine |
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| Publication Number | Publication Date |
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| CN110206648A CN110206648A (en) | 2019-09-06 |
| CN110206648B true CN110206648B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910470691.4A Active CN110206648B (en) | 2019-05-31 | 2019-05-31 | Vibration damping supporting device and turboshaft engine |
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| CN102224323A (en) * | 2008-11-21 | 2011-10-19 | 涡轮梅坎公司 | Positioning member for ring segment |
| CN202866995U (en) * | 2012-10-19 | 2013-04-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Turbo-supercharger support |
| CN203488916U (en) * | 2013-08-12 | 2014-03-19 | 厦门嘉达声学技术有限公司 | Constrained damping vibration reduction structure for pipeline |
| CN204664630U (en) * | 2015-04-30 | 2015-09-23 | 中航商用航空发动机有限责任公司 | Pipeline damping body and the pipeline vibration damper of this pipeline damping body is set |
| CN206875040U (en) * | 2017-06-19 | 2018-01-12 | 上海加冷松芝汽车空调股份有限公司 | A kind of pipeline protects damping device |
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2019
- 2019-05-31 CN CN201910470691.4A patent/CN110206648B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1537818A2 (en) * | 2003-12-05 | 2005-06-08 | Honda Motor Co., Ltd. | Power blower |
| CN2886097Y (en) * | 2006-01-25 | 2007-04-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Shock-absorption mounting device for fuel manifold in gas turbine |
| CN102224323A (en) * | 2008-11-21 | 2011-10-19 | 涡轮梅坎公司 | Positioning member for ring segment |
| CN202866995U (en) * | 2012-10-19 | 2013-04-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Turbo-supercharger support |
| CN203488916U (en) * | 2013-08-12 | 2014-03-19 | 厦门嘉达声学技术有限公司 | Constrained damping vibration reduction structure for pipeline |
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| CN206875040U (en) * | 2017-06-19 | 2018-01-12 | 上海加冷松芝汽车空调股份有限公司 | A kind of pipeline protects damping device |
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| CN110206648A (en) | 2019-09-06 |
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