CN215372726U - Fastening device and integrated compressor system and air conditioning system with same - Google Patents
Fastening device and integrated compressor system and air conditioning system with same Download PDFInfo
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- CN215372726U CN215372726U CN202120493373.2U CN202120493373U CN215372726U CN 215372726 U CN215372726 U CN 215372726U CN 202120493373 U CN202120493373 U CN 202120493373U CN 215372726 U CN215372726 U CN 215372726U
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Abstract
The utility model discloses a fastening device, which is used for assembling a flash evaporator and a compressor into an integrated compressor system, wherein the fastening device comprises a bracket structure and a pressure ring structure; the support structure comprises a first flat strip-shaped plate, and at least one flat plane of the first flat strip-shaped plate is provided with a limiting structure; the compression ring structure comprises a second flat strip-shaped plate, and assembling structures are arranged at two ends of the second flat strip-shaped plate along the strip-shaped extension direction; the pressing ring structure is bent and then surrounds the flash evaporator, and the assembling structure is correspondingly assembled with the limiting structure on the support structure to realize fastening. In the process of assembling the air conditioning system, the fastening device can be used for fixing the flash evaporator on the compressor to form an integrated compressor system; the pipeline arrangement of the outdoor unit of the air conditioner is convenient, and the pipeline connection is reduced; the problem of overproof stress and strain of equipment in the outdoor unit can be avoided by integrally fixing; the noise generated by vibration in the working process of multiple devices is prevented from exceeding the standard; meanwhile, potential safety hazards caused by excessive vibration are avoided.
Description
Technical Field
The utility model belongs to the technical field of air conditioning systems, and particularly relates to a fastening device, and an integrated compressor and an air conditioning system with the fastening device.
Background
Along with the improvement of living standard of people, the installation and the use of the air conditioning system are gradually popularized, and meanwhile, the requirement of people on the comprehensive performance of the air conditioning system is continuously improved. Nowadays, the air conditioning products for both cooling and heating occupy a large proportion in the air conditioning market, and users tend to select air conditioning equipment with rich functions and high cost performance.
When an air conditioning system in the prior art supplies heat in winter, particularly for a system using a single-stage compressor, along with the reduction of outdoor evaporation temperature, the suction density of the compressor is reduced, so that the heating capacity of the compressor is seriously reduced under the low-temperature working condition. The common method for solving the problem of low-temperature attenuation of the compressor is to increase enthalpy and supplement air by adding a flash evaporator, namely fixing the flash evaporator on a shell of the outdoor unit of the air conditioner in a welding manner; or between the outdoor unit pipes. On one hand, the vibration of the outdoor unit is increased to cause the exceeding of the vibration value; on the other hand, the pipeline connection arrangement of the compressor, the flash evaporator and other auxiliary equipment is limited, so that the equipment is inconvenient to install in the outdoor unit shell, and the stress of the equipment in the outdoor unit exceeds the standard; the long-term use not only reduces the service life of the air conditioning system but also brings potential safety hazards.
The reference CN207299261U discloses a technical solution for connecting a flash evaporator and a compressor by a fastener; but its fasteners use only threaded connections; after the technical scheme is adopted, the air conditioning system is used for a period of time, and potential safety hazards are caused on the contrary because the compressor vibrates and is easy to cause screw thread sliding or loosening and falling.
Therefore, no effective technical scheme is provided for the problem of how to optimize the connection and fixation of the flash evaporator, the compressor and each part of the outdoor unit of the air conditioner.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a fastening device for assembling a flash evaporator and a compressor into an integrated compressor system, wherein the fastening device comprises a bracket structure and a pressure ring structure; the support structure comprises a first flat strip-shaped plate, and at least one flat plane of the first flat strip-shaped plate is provided with a limiting structure; the compression ring structure comprises a second flat strip-shaped plate, and assembling structures are arranged at two ends of the second flat strip-shaped plate along the strip-shaped extension direction; the pressing ring structure surrounds the outer wall of the component to be assembled after being bent and is correspondingly assembled with the limiting structure on the support structure by using the assembling structure, so that the component to be assembled is fastened, and a plurality of components are combined to form an integrated stable structure and system. In the process of assembling the air conditioning system, the fastening device can be used for fixing the flash evaporator on the compressor to form an integrated compressor system; compared with the prior assembly technical scheme, the pipeline arrangement of the air conditioner outdoor unit is convenient, and the pipeline connection is reduced; the problem of overproof stress and strain of equipment in the outdoor unit can be avoided by integrally fixing; the noise generated by vibration in the working process of multiple devices is prevented from exceeding the standard; meanwhile, potential safety hazards caused by excessive vibration are avoided.
Optionally, the limiting structure of the first flat strip-shaped plate of the bracket structure is a groove; the grooves are formed at two tail ends of the first flat strip-shaped plate along the strip-shaped extension direction.
Optionally, a second flat strip-shaped plate of the pressing ring structure is provided with a first bend; the first bend is formed at the two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction; the tail end is bent to form a first bend, and a groove is formed at the bent position.
Further, bending the pressure ring structure and enabling the groove to face the inner side face of the pressure ring structure after bending; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator in a surrounding manner; the first bend of the pressing ring structure is clamped into a groove at a corresponding position on the support structure through a groove, and the flash evaporator is fastened.
The flash evaporator is communicated with the compressor through a pipeline, and the fastening device provided by the technical scheme can quickly complete further fixation of the flash evaporator in the assembling process; meanwhile, the fastening device does not need to be connected through bolts, and fastening looseness caused by vibration in the use process is avoided.
Optionally, the limiting structure of the support structure is a threaded hole, and the threaded hole is formed in the flat plane of the first flat strip-shaped plate and located at the tail end in the strip extending direction.
Optionally, a second bend is arranged on a second flat strip-shaped plate of the pressing ring structure; the second bend is formed at the two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction; the second bending forms a bending surface, and a bolt hole is formed in the bending surface.
Further, bending the pressing ring structure and enabling the second bending to be located on the outer side of the annular structure formed after the pressing ring structure is bent; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator in a surrounding manner; and the second bending of the compression ring structure is connected with the threaded hole at the corresponding position on the support structure through a bolt hole through a bolt, so that the flash evaporator is fastened.
Optionally, the limiting structure of the support structure is a first welding positioning protrusion, and the first welding positioning protrusion is disposed on the flat plane of the first flat strip-shaped plate and located at the end of the strip-shaped extending direction.
Optionally, a third bend is arranged on a second flat strip-shaped plate of the pressing ring structure; the third bend is formed at two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction.
Further, bending the press ring structure and enabling a third bend to be located on the outer side of the annular structure formed after the press ring structure is bent; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator in a surrounding manner; and a third bending of the pressing ring structure forms a bending surface, and the bending surface is welded after being attached to the first welding positioning bulge at the corresponding position on the support structure, so that the flash evaporator is fastened.
The fastening device provided by the technical scheme can quickly complete the further fixation of the flash evaporator in the assembling process; and meanwhile, after the compressor is assembled and fixed, the compressor is directly fastened in a welding mode, so that the vibration resistance of the connection between the compressor and the flash evaporator is further improved. The vibration stress and noise exceeding caused by long-term use are avoided, and the potential safety hazard is avoided.
The utility model also provides an integrated compressor system, and the fastening device is adopted to fix the flash evaporator on the outer side wall surface of the compressor to form the integrated compressor system. Specifically, the method comprises the following steps:
the compressor system comprises a compressor and a flash evaporator, and the axial directions of the compressor and the flash evaporator are arranged in parallel;
a flat surface of the bracket structure of the fastening device fixes the bracket structure on the outer wall surface of the compressor by welding;
the inner side surface of the fastening device after the compression ring structure is bent is encircled and attached to the outer wall surface of the flash evaporator;
and the flash evaporator and the compressor are fixedly assembled to form an integrated compressor system by assembling the support structure and the pressure ring structure.
The utility model also provides an air conditioning system, after the fastening device is adopted to fix the flash evaporator on the outer side wall surface of the compressor to form an integrated compressor system, the compressor system is placed in an outdoor unit case of the air conditioning system.
In the process of assembling the air conditioning system, the fastening device can be used for fixing the flash evaporator on the compressor to form an integrated compressor system; compared with the prior assembly technical scheme, the pipeline arrangement of the air conditioner outdoor unit is convenient, and the pipeline connection is reduced; the problem of overproof stress and strain of equipment in the outdoor unit can be avoided by integrally fixing; the noise generated by vibration in the working process of multiple devices is prevented from exceeding the standard; meanwhile, potential safety hazards caused by excessive vibration are avoided.
Of course, it is not necessary for any one product that embodies the utility model to achieve all of the above-described benefits simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used for describing the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1: a schematic of the compressor system embodiment of the present invention;
FIG. 2: a schematic structural diagram of a flash evaporator embodiment in the compressor system of the present invention;
FIG. 3: the bracket structure of the first embodiment of the fastening device is schematic;
FIG. 4: the utility model discloses a schematic diagram of a pressure ring structure of a first fastening device embodiment;
FIG. 5: the assembly schematic diagram of the bracket structure and the pressure ring structure of the first embodiment of the fastening device is shown;
FIG. 6: the bracket structure of the second embodiment of the fastening device is schematic;
FIG. 7: a schematic diagram of a pressure ring structure of a second embodiment of the fastening device of the utility model;
FIG. 8: the assembly schematic diagram of the bracket structure and the pressure ring structure of the second embodiment of the fastening device is shown;
FIG. 9: the bracket structure of the third embodiment of the fastening device is schematic;
FIG. 10: the third embodiment of the fastening device of the utility model is a schematic diagram of a pressure ring structure;
FIG. 11: the assembly schematic diagram of the bracket structure and the pressure ring structure of the third embodiment of the fastening device is shown;
in the drawings, the components, structures and devices represented by the respective symbols are as follows:
1-a compressor;
2-a flash evaporator;
201-air inlet pipe; 202-an exhaust pipe; 203-drain pipe;
204-a scaffold structure;
2041-grooves;
2042-threaded hole;
2043-a first bonding bump;
2044-a second welding projection;
205-a pressure ring structure;
2051-first bending;
2052-second bending; 20521-bolt holes;
2053-third bending;
206-housing.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
It will be understood that, although the terms first, second, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Thus, a first structure discussed below may be termed a second structure without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.
The following detailed description of embodiments of the utility model is provided in conjunction with the accompanying drawings:
the utility model provides a fastening device, which is used for assembling a flash evaporator and a compressor into an integrated compressor system, wherein the fastening device comprises a bracket structure and a pressure ring structure; the support structure comprises a first flat strip-shaped plate, and at least one flat plane of the first flat strip-shaped plate is provided with a limiting structure; the compression ring structure comprises a second flat strip-shaped plate, and assembling structures are arranged at two ends of the second flat strip-shaped plate along the strip-shaped extension direction; the pressing ring structure surrounds the outer wall of the flash evaporator after being bent and is correspondingly assembled with the limiting structure on the support structure by using the assembling structure, so that the flash evaporator is fastened.
Further, the utility model also provides a compressor system and an air conditioning system, as shown in fig. 1, wherein the compressor system comprises a compressor 1 and a flash evaporator 2, and the axial directions of the compressor 1 and the flash evaporator 2 are arranged in parallel; the flash evaporator 2 is fixed on the outer wall surface of the compressor 1 by adopting the fastening device of the utility model to form an integrated compressor system. Specifically, the method comprises the following steps:
a flat surface of the bracket structure 204 of the fastening device fixes the bracket structure to the outer wall surface of the compressor 1 by welding; the inner side surface of the fastening device after the compression ring structure 205 is bent is encircled and attached to the outer wall surface of the flash evaporator 2; the flash evaporator 2 and the compressor 1 are fixedly assembled to form an integrated compressor system by using the assembly of the bracket structure 204 and the pressure ring structure 205, and the integrated compressor system is arranged in an outdoor unit case of an air conditioning system.
In the technical scheme and the embodiment of the utility model, in order to ensure that the air conditioning system can provide more heating capacity under the severe working condition of low outdoor temperature in winter and improve the comprehensive performance of the air conditioning system, a single-stage enthalpy-increasing compression system is adopted, namely, the air is supplemented and the enthalpy is increased by increasing a flash evaporator, so that the air suction capacity of a compressor is improved and the heating efficiency is improved. Specifically, the method comprises the following steps:
as shown in fig. 2, the flash evaporator 2 includes an intake pipe 201, an exhaust pipe 202, a drain pipe 203, and a casing 206; an exhaust pipe 202 of the flash evaporator 2 is connected with an air supplement hole on the compressor 1, an air inlet pipe 201 is connected with a condenser of an air conditioning system through a flow element, and a liquid discharge pipe 203 is connected with an evaporator of the air conditioning system through the flow element; in the flash evaporator 2, liquid is deposited at the bottommost part, and gas is filled in the upper part of the cavity, so that the exhaust pipe 202 needs to extend into the cavity of the flash evaporator for a long distance until the position of the cavity of the flash evaporator is the uppermost position; the distance that the liquid discharge pipe 203 extends out of the cavity of the flash evaporator is short, so that liquid can be discharged conveniently.
Further, the gas-liquid two-phase refrigerant returning to the compressor in the refrigeration or heating cycle firstly enters a flash evaporator and is subjected to gas-liquid separation in the flash evaporator; the liquid refrigerant returns to the evaporator from a liquid discharge pipe 203 of the flash evaporator to continue circulating; and the gaseous refrigerant enters the compressor from the exhaust pipe 202 of the flash evaporator for air supplement, so that the air suction quantity of the compressor is improved, and the performance of the compressor is improved.
The fastening device of the utility model is explained in detail below by means of three specific embodiments:
example 1:
preferably, as shown in fig. 3, the limiting structure of the first flat strip of the supporting structure 204 is a groove 2041; the number of the grooves in this embodiment is two, and the grooves are formed at two ends of the first flat strip-shaped plate along the strip-shaped extending direction.
Preferably, as shown in fig. 4, the second flat strip of the press ring structure 205 is provided with a first bend 2051; the first bend is formed at the two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction; the tail end is bent to form a first bend, and a groove is formed at the bent position.
Further, the pressure ring structure 205 is bent as shown in fig. 5 and the groove faces the inner side of the bent pressure ring structure; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator 2 in a surrounding manner; the first bend 2051 of the pressure ring structure is clamped into the groove 2041 at a corresponding position on the support structure 204 through a groove, so that the flash evaporator is fastened.
The flash evaporator 2 itself needs to be communicated with the compressor 1 through a pipeline, and by using the fastening device provided by the embodiment, the bracket structure is welded and fixed on the outer side of the compressor 1 through the second welding protrusion 2044, and then the further fixation of the flash evaporator is rapidly completed by using the pressure ring structure 205; meanwhile, the fastening device does not need to be connected through bolts, and fastening looseness caused by vibration in the use process is avoided.
Example 2:
preferably, as shown in fig. 6, the limiting structure of the supporting structure 204 is a threaded hole 2042, and two threaded holes are respectively opened on the flat plane of the first flat strip and located at two ends along the strip extending direction in the present embodiment.
Preferably, as shown in fig. 7, the second flat strip of the press ring structure 205 is provided with a second bend 2052; the second bend is formed at the two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction; the second bending forms a bending surface, and a bolt hole 20521 is formed in the bending surface.
Further, the collar structure 205 is bent and a second bend 2052 is located outside the ring-shaped structure formed after bending of the collar structure; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator 2 in a surrounding manner; the second bending of the pressure ring structure is connected with the threaded hole 2042 at the corresponding position on the support structure 204 through the bolt hole 20521 through a screw, so that the flash evaporator is fastened.
Example 3:
preferably, as shown in fig. 9, the limiting structure of the supporting structure 204 is a first welding positioning protrusion 2043, in this embodiment, two groups of first welding positioning protrusions are used, which are respectively disposed on the flat plane of the first flat strip-shaped plate and located at two ends along the strip-shaped extending direction; each group is provided with two welding bulges for positioning the welding position and ensuring firm welding.
Preferably, the second flat strip of the press ring structure 205 is provided with a third bend 2053; the third bend is formed at two tail ends of the second flat strip-shaped plate along the strip-shaped extension direction.
Further, the collar structure 205 is bent and a third bend 2053 is located outside the ring-like structure formed after bending of the collar structure; the inner side surface of the bent compression ring structure is attached to the outer wall of the flash evaporator 2 in a surrounding manner; and a third bending of the pressure ring structure forms a bending surface, and the bending surface is welded after being attached to the first welding positioning protrusion 2043 at the corresponding position on the support structure 204, so that the flash evaporator is fastened.
The fastening device provided by the embodiment can be used for rapidly completing further fixing of the flash evaporator in the assembling process; and meanwhile, after the compressor is assembled and fixed, the compressor is directly fastened in a welding mode, so that the vibration resistance of the connection between the compressor and the flash evaporator is further improved. The vibration stress and noise exceeding caused by long-term use are avoided, and the potential safety hazard is avoided.
In the process of assembling the air conditioning system, the fastening device can be used for fixing the flash evaporator on the compressor to form an integrated compressor system; compared with the prior assembly technical scheme, the pipeline arrangement of the air conditioner outdoor unit is convenient, and the pipeline connection is reduced; the problem of overproof stress and strain of equipment in the outdoor unit can be avoided by integrally fixing; the noise generated by vibration in the working process of multiple devices is prevented from exceeding the standard; meanwhile, potential safety hazards caused by excessive vibration are avoided.
The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiment or embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims (12)
1. A fastening device, characterized by:
the clamping device comprises a support structure and a pressure ring structure;
the bracket structure comprises a first fastening surface; a limiting structure is arranged on the first fastening surface;
the pressure ring structure comprises a second fastening surface; an assembly structure is arranged on the second fastening surface;
the number of the limiting structures is equal to that of the assembling structures;
the pressing ring structure surrounds the outer wall of the component to be assembled after being bent, the assembling structure is correspondingly assembled with the limiting structure on the support structure, and the component to be assembled is fastened, so that the multiple assembling components form an integrated structure system.
2. The fastener of claim 1, wherein:
the limiting structure of the first fastening surface of the bracket structure is a groove; the grooves are respectively formed in two of the four sides of the first fastening face.
3. The fastener of claim 2, wherein:
the second fastening surface of the compression ring structure is provided with two first bends; the two first bends are respectively formed at two tail ends of the second fastening surface extending along the bending direction; the two tail ends are bent to form the first bend, and two grooves are formed at the bent position.
4. The fastener of claim 3, wherein:
bending the compression ring structure and enabling the two grooves to face the inner side face of the compression ring structure after bending;
the inner side surface of the bent pressure ring structure is used for surrounding and clinging to the outer wall of the component to be assembled;
the two first bending of the pressing ring structure are clamped into the grooves on two sides of the first fastening surface of the support structure respectively through the two grooves, and parts to be assembled are fastened.
5. The fastener of claim 1, wherein:
the limiting structures of the first fastening surface of the support structure are limiting holes, and the limiting holes are formed in the first fastening surface and are two in number.
6. The fastener of claim 5, wherein:
the second fastening surface of the compression ring structure is provided with two second bends; the two second bends are respectively formed at two tail ends of the second fastening surface extending along the bending direction; the two second bending surfaces form two bending surfaces, and two mounting holes are formed in the two bending surfaces respectively.
7. The fastener of claim 6, wherein:
bending the compression ring structure and enabling the two second bending surfaces to be located on the outer side of the annular structure formed after the compression ring structure is bent;
the inner side surface of the bent pressure ring structure is used for surrounding and clinging to the outer wall of the component to be assembled;
and the two second bends of the compression ring structure are respectively and fixedly connected with the two limit holes on the support structure through two fasteners through the mounting holes on the corresponding bending surfaces, so as to fasten the parts to be assembled.
8. The fastener of claim 1, wherein:
the limiting structure of the first fastening surface of the support structure is a first welding positioning protrusion, and the first welding positioning protrusion is arranged on the first fastening surface, and the number of the first welding positioning protrusion is two.
9. The fastener of claim 8, wherein:
the second fastening surface of the compression ring structure is provided with two third bends; the two third bends are formed at two ends of the second fastening surface extending in the bending direction.
10. The fastener of claim 9, wherein:
bending the compression ring structure and enabling the two third bends to be located on the outer side of the annular structure formed after the compression ring structure is bent;
the inner side surface of the bent compression ring structure is attached to the outer wall of the component to be assembled in a surrounding mode;
the two third bending of the pressing ring structure form two bending surfaces, and the two bending surfaces are respectively welded after being attached to the two first welding positioning protrusions (2043) on the support structure, and are fastened to the parts to be assembled.
11. An integrated compressor system employing the fastening device of any one of claims 1 or 2-4 or 5-7 or 8-10, wherein:
the integrated compressor system comprises a compressor and a flash vessel;
the bracket structure of the fastening device is fixed on the outer wall surface of the compressor by welding;
the inner side surface of the fastening device after the compression ring structure is bent is attached to the outer wall surface of the flash evaporator in a surrounding manner;
and the bracket structure and the pressure ring structure are assembled to realize that the flash evaporator and the compressor are fixedly assembled to form an integrated compressor system.
12. An air conditioning system characterized by: a compressor system according to claim 11 is employed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120493373.2U CN215372726U (en) | 2021-03-08 | 2021-03-08 | Fastening device and integrated compressor system and air conditioning system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120493373.2U CN215372726U (en) | 2021-03-08 | 2021-03-08 | Fastening device and integrated compressor system and air conditioning system with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215372726U true CN215372726U (en) | 2021-12-31 |
Family
ID=79623864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120493373.2U Active CN215372726U (en) | 2021-03-08 | 2021-03-08 | Fastening device and integrated compressor system and air conditioning system with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215372726U (en) |
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2021
- 2021-03-08 CN CN202120493373.2U patent/CN215372726U/en active Active
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