CN114542756B - Reversing valve and refrigerating system - Google Patents
Reversing valve and refrigerating system Download PDFInfo
- Publication number
- CN114542756B CN114542756B CN202011328253.3A CN202011328253A CN114542756B CN 114542756 B CN114542756 B CN 114542756B CN 202011328253 A CN202011328253 A CN 202011328253A CN 114542756 B CN114542756 B CN 114542756B
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- China
- Prior art keywords
- reversing valve
- channel
- inner cavity
- buffer element
- valve
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Links
- 238000013016 damping Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/0655—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with flat slides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention relates to a reversing valve and a refrigerating system, wherein the reversing valve comprises a first connecting pipe and a valve body, the first connecting pipe is provided with a first channel, the valve body is provided with a first inner cavity, the first channel is communicated with the first inner cavity, one end of the first connecting pipe, which is close to the valve body, is provided with a buffer element for separating the first channel from the first inner cavity, the buffer element is provided with one or more through holes for communicating the first channel with the first inner cavity, and the flow area of the through hole or the sum of the flow areas of the through holes is smaller than the sectional area of the first channel. The reversing valve provided by the invention effectively solves the problem of large noise generated in the reversing process of the reversing valve in the prior art.
Description
Technical Field
The invention relates to the technical field of valve bodies, in particular to a reversing valve and a refrigerating system.
Background
The reversing valve is arranged in the refrigerating system and used for realizing the switching of pipelines. The reversing valve comprises a valve body, a slide valve component and a valve seat, wherein the valve body is provided with a first inner cavity, and the slide valve component and the valve seat are arranged in the first inner cavity. The reversing valve further comprises a first connecting pipe, wherein the first connecting pipe is provided with a first channel, and the first channel is communicated with the first inner cavity. During reversing of the reversing valve, the spool valve assembly will slide relative to the valve seat. And, the first connecting pipe is connected with the compressor discharge port, and there is high-pressure gas in the first passageway to strike the sliding valve assembly, makes the sliding valve assembly bear great pressure in the slip process. In addition, according to the relation between the sliding friction force and the pressure, it is known that a large sliding friction force is generated between the sliding valve assembly and the valve seat during the sliding of the sliding valve assembly. The greater sliding friction force may cause the spool valve assembly to generate greater noise during friction with the valve seat.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a reversing valve and a refrigeration system, which solve the problem of large noise generated in the reversing process of the reversing valve in the prior art.
The invention provides a reversing valve, which comprises a first connecting pipe and a valve body, wherein the first connecting pipe is provided with a first channel, the valve body is provided with a first inner cavity, the first channel is communicated with the first inner cavity, one end of the first connecting pipe, which is close to the valve body, is provided with a buffer element for separating the first channel from the first inner cavity, the buffer element is provided with one or more through holes for communicating the first channel with the first inner cavity, and the flow area of one through hole or the sum of the flow areas of the through holes is smaller than the sectional area of the first channel.
In an embodiment of the present invention, the cross section of the through hole is circular, elliptical or polygonal, so that the through hole is convenient for processing and forming.
In an embodiment of the invention, the buffer element is in a barrel shape with an opening at one side, the opening faces away from the valve body, and the opening of the buffer element is connected with the inner wall of the first connecting pipe. The cushioning element includes a side wall and a bottom wall. The through holes are arranged on the side wall and/or the bottom wall. Therefore, the surface area of the buffer element is effectively enlarged, so that the distribution of the through holes on the surface of the buffer element can be more dispersed, namely, the throttling buffer effect of the buffer element is more obvious.
In an embodiment of the invention, a protrusion is disposed at the opening of the buffer element, and a groove is disposed on an inner wall of the first connecting tube, and the protrusion is clamped in the groove. Therefore, the buffer element can be clamped at the groove of the first connecting pipe through the bulge, and the assembly difficulty of the reversing valve is reduced.
In an embodiment of the invention, the buffer element is welded to the inner wall of the first connecting tube. Alternatively, the cushioning element is detachably connected to the first connecting tube by a fastener. By the arrangement, the assembly firmness of the buffer element is improved.
In an embodiment of the invention, the buffer element is in a shape of a truncated cone, and the bottom wall is disposed at an end of the buffer element with a smaller outer diameter. So set up for the through-hole can disperse at buffer element's lateral wall and/or diapire, strengthens the cushioning effect, and buffer element keeps away from the external diameter of the one end of first passageway less, can save material.
In an embodiment of the invention, the buffer element is in a shape of a truncated cone, and the bottom wall is disposed at an end of the buffer element with a larger outer diameter. By the arrangement, the surface area of the buffer element is further enlarged, so that the distribution of the through holes on the surface of the buffer element can be more dispersed, namely, the throttling buffer effect of the buffer element is more obvious.
In an embodiment of the invention, the buffer element has a cylindrical shape. By the arrangement, the processing difficulty of the buffer element is reduced.
In an embodiment of the invention, the buffer element has a plate shape. By the arrangement, the structure of the buffer element is simplified, and meanwhile, materials are saved.
The invention also provides a refrigeration system comprising the reversing valve according to any one of the embodiments.
The reversing valve provided by the invention has the advantages that the buffer element reduces the diameter flow of the high-pressure gas sprayed from the first channel, and the flow rate of the high-pressure gas also reduces due to the blocking effect of the buffer element. Therefore, the pressure born by the slide valve assembly is also reduced, and the problem of high noise generated in the reversing process of the reversing valve in the prior art is effectively solved.
Drawings
FIG. 1 is a cross-sectional view of a reversing valve provided with a barrel-shaped cushioning element in accordance with one embodiment of the present invention;
FIG. 2 is a cross-sectional view of a reversing valve provided with a plate-like cushioning member according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a buffer element according to an embodiment of the present invention;
FIG. 4 is a schematic view of a buffer element according to another embodiment of the present invention;
FIG. 5 is a schematic view of a buffer element according to another embodiment of the present invention;
fig. 6 is a schematic structural view of a cushioning element according to another embodiment of the present invention.
Reference numerals: 1. a first connection pipe; 11. a first channel; 2. a valve body; 21. a first lumen; 3. a buffer element; 31. a through hole; 32. an opening; 33. a protrusion; 34. a sidewall; 35. a bottom wall; 4. a second lumen; 5. a spool valve assembly; 51. a slide block; 511. a receiving groove; 52. a connecting rod; 6. a valve seat; 7. a second connection pipe; 71. a second channel; 8. a third connection pipe; 81. a third channel; 9. a fourth connection pipe; 91. and a fourth channel.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
It is noted that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention provides a reversing valve, which is applied to switching between different pipelines in a refrigeration system. In this embodiment, the reversing valve is a four-way reversing valve, and in other embodiments, the reversing valve may be a five-way reversing valve, a six-way reversing valve, or other types of reversing valves.
Referring to fig. 1 and 2, fig. 1 is a sectional view of a reversing valve provided with a barrel-shaped buffer member 3 according to an embodiment of the present invention, and fig. 2 is a sectional view of a reversing valve provided with a plate-shaped buffer member 3 according to an embodiment of the present invention. The reversing valve comprises a valve body 2 and a slide valve assembly 5, wherein a valve seat 6 is arranged in the valve body 2, the slide valve assembly 5 is arranged on the valve seat 6, the valve body 2 is provided with a first inner cavity 21, the slide valve assembly 5 is arranged in the first inner cavity 21, and the slide valve assembly 5 can slide in the first inner cavity 21.
Specifically, the valve body 2 is connected with a first connecting pipe 1, the first connecting pipe 1 is provided with a first channel 11, and the first channel 11 is communicated with a first inner cavity 21. It should be noted that, in this embodiment, the first connection pipe 1 is connected to a discharge end of a compressor (not shown) in the refrigeration system, and in other embodiments, the first connection pipe 1 may be connected to other devices according to different uses of the reversing valve.
In this embodiment, the valve body 2 is further connected to a second connecting pipe 7, a third connecting pipe 8 and a fourth connecting pipe 9, the second connecting pipe 7 is provided with a second channel 71, the third connecting pipe 8 is provided with a third channel 81, and the fourth connecting pipe 9 is provided with a fourth channel 91. The second, third and fourth connection pipes 7, 8 and 9 respectively penetrate the valve seat 6, and the spool valve assembly 5 slides within the valve body 2 to selectively communicate the second and third passages 71 and 81 or the third and fourth passages 81 and 91. The second connection pipe 7 is connected to an evaporator (not shown) in the refrigeration system, the third connection pipe 8 is connected to an intake port of the compressor, and the fourth connection pipe 9 is connected to a condenser (not shown). In other embodiments, the valve body 2 may be further connected to a fifth connection pipe, which is connected to another heat exchanger, the first connection pipe 1 or another location, and other connection pipes may be further connected to the valve body 2 according to different uses of the reversing valve.
Further, the slide valve assembly 5 includes a slide block 51 and a connecting rod 52, the slide block 51 is fixed on the connecting rod 52, a receiving groove 511 is formed on one side of the slide block 51 far away from the first channel 11, the receiving groove 511 and the valve seat 6 form a second inner cavity 4, the second inner cavity 4 can be communicated with the second channel 71 and the third channel 81, or the second inner cavity 4 can be communicated with the third channel 81 and the fourth channel 91, and the first inner cavity 21 and the second inner cavity 4 are always isolated from each other and are not communicated with each other.
In the present embodiment, when the refrigeration system is in the heating mode, the second passage 71, the second inner chamber 4 and the third passage 81 are communicated, and the first passage 11 is communicated with the fourth passage 91 through the first inner chamber 21; when the heating system needs to be switched to the cooling mode, the spool valve assembly 5 slides, the third passage 81, the second inner chamber 4 and the fourth passage 91 communicate, and the first passage 11 communicates with the second passage 71 through the first inner chamber 21.
In the conventional reversing valve, when the reversing valve is reversing, since the first channel 11 is connected to the compressor exhaust port, the pressure is high, the pressure of the high-pressure gas is received during the sliding process of the sliding block 51, so that the friction force between the sliding block 51 and the valve seat 6 can be increased, and particularly when the sliding block 51 is positioned right below the first channel 11, the received pressure is the largest, and the generated noise problem is more serious.
The invention solves the problem of larger noise generated in the reversing process of the reversing valve in the prior art by arranging the buffer element 3 for separating the first channel 11 from the first inner cavity 21 at one end of the first connecting pipe 1, which is close to the valve body 2. The buffer element 3 is provided with one or more through holes 31 communicating the first channel 11 with the first inner cavity 21, and the flow area of one through hole 31 or the sum of the flow areas of the plurality of through holes 31 is smaller than the cross-sectional area of the first channel 11. In this way, the buffer member 3 reduces the amount of the high-pressure gas that is ejected from the first passage 11, and the flow rate of the high-pressure gas is also reduced due to the blocking effect of the buffer member 3, thereby reducing the impact of the high-pressure fluid received by the slider 51. Therefore, the pressure applied to the slide valve assembly 5 is also reduced, so that the problem of high noise generated in the reversing process of the reversing valve in the prior art is effectively solved.
Further, the cross section of the through hole 31 is circular, elliptical or polygonal, so that the through hole 31 is convenient to be formed. But is not limited thereto, the cross section of the through hole 31 may be in other shapes such as a ring shape, a cone shape, etc.
In an embodiment, as shown in fig. 1, 3 and 4, fig. 3 is a schematic structural view of a cushioning element 3 according to an embodiment of the present invention, and fig. 4 is a schematic structural view of a cushioning element 3 according to another embodiment of the present invention. The damping element 3 has a barrel shape with an opening 32 on one side, the opening 32 facing away from the valve body 2, the opening 32 of the damping element 3 being connected to the inner wall of the first connecting tube 1. The cushioning element 3 comprises a side wall 34 and a bottom wall 35. The through hole 31 may be provided in the sidewall 34; alternatively, the through hole 31 may be provided in the bottom wall 35; alternatively, the through holes 31 may be provided in both the side walls 34 and the bottom wall 35. In this way, the surface area of the buffer element 3 is effectively enlarged, so that the distribution of the through holes 31 on the surface of the buffer element 3 can be more dispersed, that is, the throttling buffer effect of the buffer element 3 is more obvious.
In an embodiment, as shown in fig. 3 and 4, the opening 32 of the buffer element 3 is provided with a protrusion 33, and the inner wall of the first connecting tube 1 is correspondingly provided with a groove, and the protrusion 33 is clamped in the groove. Therefore, the buffer element 3 can be clamped at the groove of the first connecting pipe 1 through the bulge 33, so that the assembly difficulty of the reversing valve is reduced, and the disassembly is convenient.
In other embodiments, the buffer element 3 is welded to the inner wall of the first connecting tube 1 to strengthen the connection strength between the buffer element 3 and the first connecting tube 1, so as to avoid the buffer element 3 from being flushed away from the end of the first connecting tube 1 near the valve body 2 by high-pressure fluid. Or, the buffer element 3 is detachably connected to the first connecting pipe 1 through the fastener, and if the through hole 31 in the buffer element 3 is blocked by the medium, the buffer element 3 can be conveniently removed and cleaned. So arranged, the degree of firmness of the assembly of the cushioning element 3 is improved.
In one embodiment, as shown in fig. 3, the buffer element 3 has a truncated cone shape, and the bottom wall 35 is disposed at an end of the buffer element 3 having a smaller outer diameter. So arranged, the through holes 31 can be dispersed in the side wall 34 and the bottom wall 35 of the buffer element 3, the buffer effect is enhanced, and the outer diameter of the end of the buffer element 3 away from the first channel 11 is smaller, so that the material can be saved. In one embodiment, as shown in fig. 4, the buffer element 3 has a truncated cone shape, and the bottom wall 35 is provided at the end of the buffer element 3 having a larger outer diameter. By this arrangement, the surface area of the damper 3 is further enlarged, so that the distribution of the through holes 31 on the surface of the damper 3 can be more dispersed, that is, the throttling and cushioning effects of the damper 3 are more remarkable.
In an embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of a cushioning element 3 according to another embodiment of the present invention. The cushioning element 3 has a cylindrical shape. So set up, cylindric comparatively convention has reduced the processing degree of difficulty of buffer element 3.
In an embodiment, as shown in fig. 2 and 6, fig. 6 is a schematic structural diagram of a cushioning element 3 according to still another embodiment of the present invention. The buffer element 3 has a plate shape. Thus, the structure of the buffer element 3 is simplified and at the same time material is saved.
The invention also provides a refrigeration system comprising the reversing valve according to any one of the embodiments.
In operation, high pressure fluid enters from the first passage 11 and flows through the through hole 31 in the buffer element 3, the through hole 31 can reduce the flow area and has a blocking effect on the fluid, thereby reducing the pressure of the fluid, weakening the impact of the fluid on the slide valve assembly 5 and reducing the noise generated when the valve assembly slides on the valve seat 6.
The technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments are not described, however, all of the combinations of the technical features should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the invention and are not to be construed as limiting the invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.
Claims (8)
1. The reversing valve comprises a first connecting pipe (1) and a valve body (2), wherein the first connecting pipe (1) is provided with a first channel (11), the valve body (2) is provided with a first inner cavity (21), the first channel (11) is communicated with the first inner cavity (21), and the reversing valve is characterized in that one end, close to the valve body (2), of the first connecting pipe (1) is provided with a buffer element (3) for separating the first channel (11) from the first inner cavity (21), the buffer element (3) is provided with one or more through holes (31) for communicating the first channel (11) with the first inner cavity (21), and the sum of the flow area of one through hole (31) or the flow area of a plurality of through holes (31) is smaller than the sectional area of the first channel (11);
the reversing valve further comprises a slide valve assembly (5), a valve seat (6) is arranged in the valve body (2), the slide valve assembly (5) is arranged on the valve seat (6), the slide valve assembly (5) is arranged in the first inner cavity (21), the slide valve assembly (5) can slide in the first inner cavity (21), and the buffer element (3) and the valve seat (6) are respectively arranged on two sides of the slide valve assembly (5);
the buffer element (3) is barrel-shaped with an opening (32) at one side, the opening (32) faces away from the valve body (2), and the opening (32) of the buffer element (3) is connected with the inner wall of the first connecting pipe (1); the cushioning element (3) comprises a side wall (34) and a bottom wall (35), both the side wall (34) and the bottom wall (35) extending into the first inner cavity (21);
the through hole (31) is arranged on the side wall (34), and/or the through hole (31) is arranged on the bottom wall (35).
2. Reversing valve according to claim 1, characterized in that the cross-section of the through hole (31) is circular or oval or polygonal.
3. Reversing valve according to claim 1, characterized in that the opening (32) of the damping element (3) is provided with a protrusion (33), the inner wall of the first connecting tube (1) is correspondingly provided with a groove, and the protrusion (33) is clamped in the groove.
4. Reversing valve according to claim 1, characterized in that the damping element (3) is welded to the inner wall of the first connecting tube (1); alternatively, the buffer element (3) is detachably connected to the first connecting tube (1) by means of a fastener.
5. Reversing valve according to claim 1, characterized in that the damping element (3) is in the shape of a truncated cone, the bottom wall (35) being provided at the end of the damping element (3) with smaller outer diameter.
6. Reversing valve according to claim 1, characterized in that the damping element (3) is in the shape of a truncated cone, the bottom wall (35) being provided at the end of the damping element (3) with the larger outer diameter.
7. Reversing valve according to claim 1, characterized in that the damping element (3) is cylindrical.
8. A refrigeration system comprising a reversing valve according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328253.3A CN114542756B (en) | 2020-11-24 | 2020-11-24 | Reversing valve and refrigerating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328253.3A CN114542756B (en) | 2020-11-24 | 2020-11-24 | Reversing valve and refrigerating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114542756A CN114542756A (en) | 2022-05-27 |
| CN114542756B true CN114542756B (en) | 2024-03-22 |
Family
ID=81659950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011328253.3A Active CN114542756B (en) | 2020-11-24 | 2020-11-24 | Reversing valve and refrigerating system |
Country Status (1)
| Country | Link |
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| CN (1) | CN114542756B (en) |
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| CN206723501U (en) * | 2017-03-09 | 2017-12-08 | 浙江盾安机械有限公司 | The sliding block and four-way reversing valve of a kind of reversal valve |
| CN208295209U (en) * | 2018-04-19 | 2018-12-28 | 广州新星阀门实业有限公司 | A kind of check-valves that noise is small |
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| CN101614288A (en) * | 2008-06-26 | 2009-12-30 | 浙江三花制冷集团有限公司 | Valve seat and the main valve of four-way reversing valve and the four-way change-over valve that use this valve seat |
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| CN208295209U (en) * | 2018-04-19 | 2018-12-28 | 广州新星阀门实业有限公司 | A kind of check-valves that noise is small |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114542756A (en) | 2022-05-27 |
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