CN212717183U - Compressor air supplement unit and compressor - Google Patents
Compressor air supplement unit and compressor Download PDFInfo
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- CN212717183U CN212717183U CN202021512489.8U CN202021512489U CN212717183U CN 212717183 U CN212717183 U CN 212717183U CN 202021512489 U CN202021512489 U CN 202021512489U CN 212717183 U CN212717183 U CN 212717183U
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Abstract
The utility model provides a compressor air supplement unit and compressor relates to compressor technical field, has solved current compression intracavity pressure and has higher and lead to the refrigerant backward flow, and gaseous leakage, the lower technical problem of compressor efficiency are located from the air supplement easily. The air supplementing device of the compressor comprises an air cylinder and an air supplementing assembly; the cylinder is provided with an installation channel which can be communicated with a compression cavity of the compressor; the air supplement component comprises a thrust piece and an air supplement pipe, at least the air supplement pipe is slidably arranged in the installation channel, and two ends of the air supplement pipe are respectively abutted with the roller of the compressor and the thrust piece; in the rotation process of the roller, under the action of the thrust piece, at least part of the section of the air supply pipe can stretch out and draw back into and out of a compression cavity of the compressor. The compressor comprises a compressor body and a compressor air supplementing device. The utility model is used for a can prevent that the refrigerant backward flow from leaking, guarantee compressor air supplement unit and compressor of compressor efficiency.
Description
Technical Field
The utility model belongs to the technical field of the compressor technique and specifically relates to a compressor air supplement unit and set up this compressor air supplement unit's compressor is related to.
Background
Most of the rotary compressors are single-cylinder enthalpy-free compressors, the traditional air conditioner can achieve an ideal refrigeration effect at the air suction temperature of more than ten degrees, the air suction temperature is high in places with severe climate such as middle east tropics, the energy efficiency level of an air conditioning system is poor, the refrigeration capacity is low, and the power is high. In order to solve the defects, in the prior art, a flash evaporator is additionally arranged in an air conditioning system, an air supplementing opening is arranged, low-temperature liquid in an air conditioning condenser is converted into low-temperature gas, and the low-temperature gas is injected into a pump body through the air supplementing opening, so that the temperature in the pump body can be effectively reduced, the refrigerating capacity of the air conditioning system is increased, and the energy efficiency level of the air conditioning system is improved. However, the applicant finds that when the compressor with the flash evaporator is in operation, the refrigerant flows back due to the high pressure in the compression cavity of the compressor, gas is easy to leak from the air supplementing opening, and the energy efficiency of the compressor is low due to the unreasonable arrangement of the air supplementing opening.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compressor air supplement unit and set up this compressor air supplement unit's compressor to the compression intracavity pressure of the compressor that exists among the solution prior art is higher and lead to the refrigerant backward flow, and gas is easy to be followed air supplement department and is leaked, the lower technical problem of compressor efficiency. The following explains various technical effects that can be produced by the preferred technical scheme in the technical schemes of the utility model.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a compressor air supplement device, which comprises an air cylinder and an air supplement component; wherein the content of the first and second substances,
the cylinder is provided with an installation channel which can be communicated with a compression cavity of the compressor; the air supplementing assembly comprises a thrust piece and an air supplementing pipe, at least the air supplementing pipe is slidably mounted in the mounting channel, two ends of the air supplementing pipe are respectively abutted against the roller of the compressor and the thrust piece, the air supplementing pipe is provided with an air supplementing channel, and an airflow inlet of the air supplementing channel is communicated with the mounting channel; in the rotation process of the roller, under the action of the thrust piece, at least part of the section of the air supply pipe can stretch out and draw back into a compression cavity of the compressor, so that an airflow outlet of the air supply channel is positioned in the compression cavity or in the installation channel.
In a preferred or optional embodiment, the air supply channel includes an air inlet hole formed along the axial direction of the air supply pipe and an air outlet hole formed along the radial direction of the air supply pipe, an airflow inlet of the air inlet hole is located at one end of the air supply pipe close to the thrust member, and an airflow outlet of the air inlet hole is communicated with the air outlet hole.
In a preferred or alternative embodiment, the air outlet is spaced from the end of the air supplement tube remote from the thrust member.
In a preferred or alternative embodiment, the outer diameter of the air supply pipe is D ≧ D +2, wherein D is the inner diameter of the air inlet; and d is2≥2Φ2Wherein phi is the inner diameter of the air outlet.
In a preferred or alternative embodiment, the air supply channel comprises a vent groove arranged on the outer surface of the air supply pipe along the axial direction of the air supply pipe, and a distance exists between the end of the vent groove far away from the thrust piece and the end of the air supply pipe far away from the thrust piece.
In a preferred or optional embodiment, the thrust member is a compression spring, the mounting channel comprises a spring hole and a sliding hole, the compression spring is arranged in the spring hole, and the air supplementing pipe is in clearance fit with the sliding hole.
In a preferred or alternative embodiment, the compressor air supplement device further comprises an air suction pipe and a connecting pipe, the connecting pipe is used for communicating the air suction pipe with the installation channel, and one end, away from the air supplement pipe, of the thrust piece is abutted to a partial section of the connecting pipe.
In a preferred or alternative embodiment, at least two mounting channels are arranged on the cylinder, and one air supplement component is arranged in each mounting channel.
In a preferred or optional embodiment, the compressor air supplement device further comprises an air suction pipe and a connecting pipe, one end of the connecting pipe is communicated with the air suction pipe, the other end of the connecting pipe comprises at least two pipe orifices arranged in parallel, and each pipe orifice is respectively communicated with one of the mounting channels; one end of each thrust piece, which is far away from the air supplementing pipe, is respectively abutted against a partial section of the connecting pipe.
The utility model provides a compressor, which comprises a compressor body and a compressor air supplement device provided by any technical proposal of the utility model; wherein the content of the first and second substances,
the compressor body comprises a roller, the extending direction of the mounting channel is arranged along the radial direction of the cylinder, and one end, close to the compression cavity, of the air supplementing pipe is abutted to the roller.
In a preferred or optional embodiment, the cylinder is provided with a slide sheet groove, and an included angle between the center line of the air supplementing assembly and the center line of the slide sheet groove is theta4＝π-θ3＝PI·π/PV(ii) a Wherein the connecting line of the center of the cylinder and the contact point of the roller and the inner wall of the cylinder is l1When the airflow outlet of the air supply channel starts to enter the compression cavity, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta1When the airflow outlet of the air supply channel completely enters the installation channel, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta2When the air supply pipe extends into the compression cavity for the longest time, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta3＝(θ2+θ1)/2，PIFor suction pressure, PVTo supplement the air pressure; theta4The value range of (a) is 105 +/-10 degrees.
The utility model provides a compressor air supplement unit, including cylinder and tonifying qi subassembly, be provided with the installation passageway that can communicate the compression chamber on the cylinder, the tonifying qi subassembly includes thrust piece and moisturizing pipe, at least the moisturizing pipe slidable mounting is in the installation passageway, the both ends of moisturizing pipe respectively with the roller of compressor with the thrust piece looks butt, in the roller rotates the process, the roller with the thrust piece mutually supports, make at least some sections of moisturizing pipe can stretch out and draw back in and out the compression chamber, be provided with the tonifying qi passageway on the moisturizing pipe; when part of the section of the air supplement component extends into the compression cavity, the airflow outlet of the air supplement channel is communicated with the compression cavity, so that air supplement is performed in the compression cavity; when a part of the air supplement component retracts into the installation channel, the airflow outlet of the air supplement channel is positioned in the installation channel and is isolated from the compression cavity; the expansion and contraction of the air supply pipe are controlled through the rotation of the compressor roller, so that the opening and closing of the air supply channel are controlled, the refrigerant in the compression cavity can be prevented from leaking from the air supply channel, and the energy efficiency of the compressor is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a compressor provided by the present invention;
FIG. 2 is a partially enlarged view of the compressor air compensator shown in FIG. 1;
FIG. 3 is a schematic view of the structure of the air supplement pipe shown in FIG. 2;
FIG. 4 is a schematic view of a second embodiment of the air supplement device for a compressor according to the present invention;
FIG. 5 is a schematic view of the structure of the air supplement pipe shown in FIG. 4;
FIG. 6 is a schematic view of a third embodiment of the air supplement device for a compressor according to the present invention;
FIG. 7 is a schematic view of the gas supply passage starting to open;
FIG. 8 is a schematic view of the gas supply passage when fully closed;
FIG. 9 is a schematic view of the air supplement assembly extending the longest distance into the compression chamber;
FIG. 10 is a schematic view of the air supplement assembly fully inserted into the installation passage.
In the figure, 1, cylinder; 11. installing a channel; 111. a spring hole; 112. a slide hole; 2. a gas supplementing component; 21. a gas supply channel; 211. an air inlet; 212. an air outlet; 213. a vent channel; 22. a gas supplementing pipe; 23. a thrust member; 3. an air intake duct; 4. a connecting pipe; 41. a pipe orifice; 5. a compressor body; 51. a compression chamber; 52. a roller; 53. a slide groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model provides a can prevent that the refrigerant backward flow from leaking, guarantee compressor air supplement unit and compressor of compressor efficiency.
The technical solution provided by the present invention will be explained in more detail with reference to fig. 1 to 10.
As shown in fig. 1 to 10, the air supplement device of the compressor provided by the present invention comprises an air cylinder 1 and an air supplement assembly 2; wherein the content of the first and second substances,
the cylinder 1 is provided with an installation channel 11, and the installation channel 11 can be communicated with a compression cavity 51 of the compressor; the air supplement component 2 comprises a thrust piece 23 and an air supplement pipe 22, at least the air supplement pipe 22 is slidably installed in the installation channel 11, two ends of the air supplement pipe 22 are respectively abutted against a roller 52 of the compressor and the thrust piece 23, the air supplement pipe 22 is provided with an air supplement channel 21, and an airflow inlet of the air supplement channel 21 is communicated with the installation channel 11; during the rotation of the roller 52, under the action of the thrust piece 23, at least a section of the air supply pipe 22 can be extended and retracted into and out of the compression chamber 51 of the compressor, so that the air flow outlet of the air supply channel 21 is located in the compression chamber 51 or in the installation channel 11.
The utility model provides a compressor air supplement unit, including cylinder 1 and tonifying qi subassembly 2, be provided with the installation passageway 11 that can communicate compression chamber 51 on the cylinder 1, tonifying qi subassembly 2 includes thrust piece 23 and air supplement pipe 22, at least air supplement pipe 22 slidable mounting is in installation passageway 11, the both ends of air supplement pipe 22 respectively with the roller 52 and the thrust piece 23 looks butt of compressor, in the roller 52 rotation process, roller 52 and thrust piece 23 mutually support, make at least some sections section of air supplement pipe 22 can stretch out and draw back and pass in compression chamber 51, be provided with tonifying qi passageway 21 on the air supplement pipe 22; when part of the air supplement component 2 extends into the compression cavity 51, the airflow outlet of the air supplement channel 21 is communicated with the compression cavity 51, so that air supplement is performed in the compression cavity 51; when a part of the air supplement component 2 retracts into the installation channel 11, the air flow outlet of the air supplement channel 21 is positioned in the installation channel 11 and is isolated from the compression cavity 51; the expansion and contraction of the air supply pipe 22 are controlled by the rotation of the compressor roller 52, so that the opening and closing of the air supply channel 21 are controlled, the refrigerant in the compression cavity 51 can be prevented from leaking from the air supply channel 21, and the energy efficiency of the compressor is ensured.
In a preferred or alternative embodiment, the air supply channel 21 includes an air inlet hole 211 formed along the axial direction of the air supply pipe 22 and an air outlet hole 212 formed along the radial direction of the air supply pipe 22, an air flow inlet of the air inlet hole 211 is located at one end of the air supply pipe 22 close to the thrust piece 23, and an air flow outlet of the air inlet hole 211 is communicated with the air outlet hole 212.
Specifically, the air inlet hole 211 communicates with the installation passage 11, and when a partial section of the air supplement pipe 22 extends into the compression chamber 51, the air in the installation passage 11 flows through the air inlet hole 211 and the air outlet hole 212 in sequence into the compression chamber 51.
In a preferred or alternative embodiment, the outlet opening 212 is spaced from the end of the air supplement tube 22 remote from the thrust member 23. The air outlet hole 212 can be completely closed when the air supplement pipe 22 enters the installation passage 11, thereby completely isolating the air supplement passage 21 from the compression chamber 51.
In a preferred or alternative embodiment, the outer diameter of the air supply pipe 22 is D ≧ D +2, where D is the inner diameter of the air inlet 211; and d is2≥2Φ2Wherein Φ is the inner diameter of the air outlet 212.
Specifically, in order to ensure the air supply amount and prevent the air supply pipe 22 from being blocked by impurities, the minimum inner diameter d of the air supply pipe 22 is set to be 1mm, and then the optimal size of the air supply pipe is as follows: the outer diameter D is more than or equal to 3, the inner diameter D is more than or equal to 1, and the diameter phi of the gas supplementing hole is more than or equal to V2/2.
In a preferred or alternative embodiment, the air supply channel 21 comprises a ventilation groove 213 arranged on the outer surface of the air supply tube 22 along the axial direction of the air supply tube 22, and a distance exists between the end of the ventilation groove 213 far away from the thrust piece 23 and the end of the air supply tube 22 far away from the thrust piece 23.
Specifically, during the process of extending and retracting the air supplement pipe 22, the air in the installation channel 11 enters the compression cavity 51 through the vent groove 213, and due to the distance between the end of the vent groove 213 far away from the thrust piece 23 and the end of the air supplement pipe 22 far away from the thrust piece 23, the air supplement channel 21 can be completely isolated from the compression cavity 51 when the air supplement pipe 22 retracts into the installation channel 11.
In a preferred or alternative embodiment, the pushing member 23 is a compression spring, the installation channel 11 includes a spring hole 111 and a sliding hole 112, the compression spring is disposed in the spring hole 111, and the air supplement pipe 22 is in clearance fit with the sliding hole 112.
Specifically, the inner diameter of the sliding hole 112 is smaller than the inner diameter of the spring hole 111, and the outer diameter of the end of the air supplement pipe 22 away from the compression cavity 51 is larger than the outer diameter of the remaining section, so that the air supplement pipe 22 is prevented from sliding out of the sliding hole 112.
In a preferred or alternative embodiment, the compressor air supplement device further comprises an air suction pipe 3 and a connecting pipe 4, the connecting pipe 4 connects the air suction pipe 3 with the installation channel 11, and one end of the thrust piece 23 far away from the air supplement pipe 22 is abutted with a partial section of the connecting pipe 4
Specifically, the connecting pipe 4 is welded with the air suction pipe 3, and the outer wall surface of the connecting pipe 4 can be connected with the inner wall of the installation channel 11 in an interference fit manner, so that air leakage is prevented; the suction pipe 3 is used to inject low-temperature gas into the installation passage 11, and the connection pipe 4 is used to connect the suction pipe 3 with the installation passage 11.
In a preferred or alternative embodiment, at least two mounting channels 11 are provided on the cylinder 1, and one air supplement assembly 2 is provided in each mounting channel 11.
As a preferred or alternative embodiment, the compressor air supplement device further comprises an air suction pipe 3 and a connecting pipe 4, one end of the connecting pipe 4 is communicated with the air suction pipe 3, the other end of the connecting pipe 4 comprises at least two pipe orifices 41 arranged in parallel, and each pipe orifice 41 is respectively communicated with one of the mounting channels 11; the end of each thrust piece 23 remote from the inflation tube 22 abuts against a respective partial section of the connecting tube 4. The injection amount of the low-temperature gas can be increased, and the refrigerating capacity of the system is further increased.
The utility model provides a compressor, which comprises a compressor body 5 and a compressor air supplement device provided by any technical proposal of the utility model; wherein the content of the first and second substances,
the compressor body 5 includes a roller 52, the extending direction of the mounting passage 11 is opened in the radial direction of the cylinder 1, and one end of the air supply pipe 22 close to the compression chamber 51 abuts against the roller 52.
As a preferred or alternative embodiment, the cylinder is provided with a slide sheet groove 53, and the included angle between the central line of the air supplement component 2 and the central line of the slide sheet groove 53 is theta4＝π-θ3＝PI·π/PV(ii) a Wherein, the line connecting the center of the cylinder 1 and the contact point of the roller 52 and the inner wall of the cylinder 1 is l1When the gas flow outlet of the charge passage 21 starts to enter the compression chamber 51,/1The included angle between the central line of the sliding sheet groove 53 and the central line of the sliding sheet groove is theta1When the airflow outlet of the air supply passage 21 completely enters the installation passage 11,/1And sliding vaneThe angle between the centre lines of the slots 53 is theta2When the air supply pipe 22 is extended into the compression chamber 51 longest,/1The included angle between the central line of the sliding sheet groove 53 and the central line of the sliding sheet groove is theta3＝(θ2+θ1)/2，PIFor suction pressure, PVTo supplement the air pressure; theta4The value range of (a) is 105 +/-10 degrees.
In particular, the national standard T1 operating mode, PI＝0.996，PO3.350 (exhaust pressure), empirical coefficient ω 0.93 ± 0.02, PV＝ω√(PI·PO) 1.70 ± 0.04, then θ4＝105.5°±2.5°；
Middle east T3 operating mode, PI＝1.184，PO4.276 (exhaust pressure), PV＝ω√(PI PO) 2.09 ± 0.04, then θ4＝102.5±2.5°。
At the compression ratio P of the compressorO/PIUnder the condition of 3.5 +/-0.5, the optimal air supply angle is set to be 105 +/-10 degrees.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connection (such as riveting and welding), of course, the mutual fixed connection can also be an integral structure (for example, the mutual fixed connection is manufactured by casting and integral forming instead (except that the integral forming process can not be adopted obviously).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated. The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (10)
1. The air supplementing device of the compressor is characterized by comprising an air cylinder and an air supplementing assembly; wherein the content of the first and second substances,
the cylinder is provided with an installation channel which can be communicated with a compression cavity of the compressor; the air supplementing assembly comprises a thrust piece and an air supplementing pipe, at least the air supplementing pipe is slidably mounted in the mounting channel, two ends of the air supplementing pipe are respectively abutted against the roller of the compressor and the thrust piece, the air supplementing pipe is provided with an air supplementing channel, and an airflow inlet of the air supplementing channel is communicated with the mounting channel; in the rotation process of the roller, under the action of the thrust piece, at least part of the section of the air supply pipe can stretch out and draw back into a compression cavity of the compressor, so that an airflow outlet of the air supply channel is positioned in the compression cavity or in the installation channel.
2. The compressor air supplement unit as claimed in claim 1, wherein the air supplement channel comprises an air inlet hole axially opened along the air supplement pipe and an air outlet hole radially opened along the air supplement pipe, an air inlet of the air inlet hole is located at one end of the air supplement pipe close to the thrust member, and an air outlet of the air inlet hole is communicated with the air outlet hole.
3. The compressor air supplement assembly of claim 2, wherein the air outlet is spaced from an end of the air supplement tube distal from the thrust member.
4. The compressor air supplement device of claim 1, wherein the air supplement channel comprises a vent groove axially disposed along the air supplement pipe at an outer surface of the air supplement pipe, and a distance exists between an end of the vent groove away from the thrust piece and an end of the air supplement pipe away from the thrust piece.
5. The compressor air supplement unit of any one of claims 1 to 4, wherein the thrust member is a compression spring, the mounting channel includes a spring hole and a sliding hole, the compression spring is disposed in the spring hole, and the air supplement pipe is in clearance fit with the sliding hole.
6. The compressor air supplement assembly of claim 5, further comprising an air intake tube and a connecting tube, wherein the connecting tube connects the air intake tube to the mounting channel, and wherein an end of the thrust member distal from the air supplement tube abuts a segment of the connecting tube.
7. The compressor air supplement unit of any one of claims 1 to 4, wherein at least two of said mounting passages are provided in said cylinder, and a respective one of said air supplement units is provided in each of said mounting passages.
8. The compressor air supplement assembly of claim 7, further comprising an air intake pipe and a connecting pipe, wherein one end of the connecting pipe is in communication with the air intake pipe, and the other end of the connecting pipe comprises at least two nozzles arranged in parallel, each nozzle being in communication with one of the mounting passages; one end of each thrust piece, which is far away from the air supplementing pipe, is respectively abutted against a partial section of the connecting pipe.
9. A compressor, characterized by comprising a compressor body and the compressor air supplement device of any one of claims 1 to 8; wherein the content of the first and second substances,
the compressor body comprises a roller, the extending direction of the mounting channel is arranged along the radial direction of the cylinder, and one end, close to the compression cavity, of the air supplementing pipe is abutted to the roller.
10. The compressor of claim 9, wherein the cylinder is provided with a slide groove, and an included angle θ is formed between a center line of the air supplement component and a center line of the slide groove4＝π-θ3＝PI·π/PV(ii) a Wherein the connecting line of the center of the cylinder and the contact point of the roller and the inner wall of the cylinder is l1When the airflow outlet of the air supply channel starts to enter the compression cavity, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta1When the airflow outlet of the air supply channel completely enters the installation channel, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta2When the air supply pipe extends into the compression cavity for the longest time, l1The included angle between the central line of the slide sheet groove and the central line of the slide sheet groove is theta3＝(θ2+θ1)/2，PIFor suction pressure, PVTo supplement the air pressure; theta4The value range of (a) is 105 +/-10 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512489.8U CN212717183U (en) | 2020-07-27 | 2020-07-27 | Compressor air supplement unit and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512489.8U CN212717183U (en) | 2020-07-27 | 2020-07-27 | Compressor air supplement unit and compressor |
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| Publication Number | Publication Date |
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| CN212717183U true CN212717183U (en) | 2021-03-16 |
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| CN202021512489.8U Active CN212717183U (en) | 2020-07-27 | 2020-07-27 | Compressor air supplement unit and compressor |
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| CN (1) | CN212717183U (en) |
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