CN112709860A - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN112709860A CN112709860A CN202011075550.1A CN202011075550A CN112709860A CN 112709860 A CN112709860 A CN 112709860A CN 202011075550 A CN202011075550 A CN 202011075550A CN 112709860 A CN112709860 A CN 112709860A
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- Prior art keywords
- valve
- pipe
- joint pipe
- pipe portion
- curved
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- 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
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Details Of Valves (AREA)
Abstract
The invention provides an electric valve and a refrigeration cycle system which reduce noise such as refrigerant passing sound in a secondary side joint pipe. The first joint pipe (21) and the second joint pipe (22) are respectively communicated with a valve chamber (1A) of the valve housing (1). The first joint pipe (21) is used as a primary joint pipe, and the second joint pipe (22) is used as a secondary joint pipe. A long cylindrical rectifying pipe portion (20) is provided which communicates with the valve chamber (1A) and projects into the second joint pipe (22). The second joint pipe (22) is composed of a straight pipe section (22A) connected to the valve housing (1) and a curved pipe section (22B) curved from the straight pipe section (22A). The end of the rectifying pipe section (20) is disposed so as to face the inner wall of the curved pipe section (22B) of the second joint pipe (22). The end (20a) of the flow-straightening pipe section (20) in the direction of the axis (L) is arranged on the curved pipe section (22B) side of the boundary between the straight pipe section (22A) and the curved pipe section (22B) of the second joint pipe (22).
Description
Technical Field
The present invention relates to an electrically operated valve used in a refrigeration cycle system or the like and a refrigeration cycle system.
Background
Currently, as an electrically operated valve provided in a refrigeration cycle of an air conditioner, there is an electrically operated valve disclosed in japanese patent application laid-open No. 2013-234726 (patent document 1), for example. In the motor-operated valve of patent document 1, the first valve port and the second valve port are formed in the valve housing, and the flow of the refrigerant in the valve ports is stabilized to realize silencing of the motor-operated valve.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-234726
Disclosure of Invention
Problems to be solved by the invention
In the motor-operated valve of patent document 1, the shape of the valve throttle portion (i.e., the shape of the valve port) is changed to reduce the refrigerant passage noise. However, only improvement of the structure of the throttle portion may not sufficiently improve sound due to restrictions on the component structure, the piping shape, and the like, and there is still room for improvement as a measure against noise.
The invention provides an electric valve and a refrigeration cycle system which reduce noise such as refrigerant passing sound in a secondary side joint pipe.
Means for solving the problems
The electric valve of the present invention is configured such that a first joint pipe and a second joint pipe are respectively communicated with a valve chamber of a valve body, one of the first joint pipe and the second joint pipe is used as a primary side joint pipe into which a fluid flows, and the other is used as a secondary side joint pipe from which the fluid flows out, and is characterized by comprising a long cylindrical rectifying pipe portion communicated with the valve chamber and protruding into the secondary side joint pipe, wherein the secondary side joint pipe comprises a straight pipe portion connected with the valve body and a curved pipe portion curved from the straight pipe portion, and wherein an end portion of the rectifying pipe portion is arranged to face the curved pipe portion of the secondary side joint pipe.
In this case, the electrically operated valve is preferably arranged such that an end portion of the rectifying pipe portion is located on the curved pipe portion side with respect to a boundary between the straight pipe portion and the curved pipe portion of the secondary side joint pipe.
Preferably, the electric valve has a relationship that an inner diameter "D" of the inner passage of the rectifying pipe portion and an inner diameter "D" of the straight pipe portion of the secondary side joint pipe are D ≧ D/2.
In the electric valve, preferably, the first joint pipe and the second joint pipe are connected to the valve body in a direction intersecting the valve chamber.
Preferably, the electric valve includes a valve port having an opening area increased or decreased by a valve member and opening toward the valve chamber through an inner passage of the rectifying pipe portion.
The refrigeration cycle system of the present invention includes a compressor, a condenser, an expansion valve, and an evaporator, and is characterized in that the motor-operated valve is used as the expansion valve.
The effects of the invention are as follows.
According to the motor-operated valve of the present invention, since the end of the rectifying pipe portion faces the inner wall of the curved pipe portion, the fluid flowing out of the rectifying pipe portion collides with the inner wall of the curved pipe portion of the secondary side joint pipe. Therefore, the velocity of the fluid flowing in the secondary side joint pipe is decelerated, thereby reducing noise.
Further, according to the refrigeration cycle system of the present invention, as in the case of the motor-operated valve, the speed of the fluid flowing through the secondary side joint pipe is reduced, thereby reducing noise.
Drawings
Fig. 1 is a longitudinal sectional view of a main portion of an electric valve according to a first embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of a main portion of the electric valve in the first embodiment.
Fig. 3 is a longitudinal sectional view of a main portion of an electric valve in a second embodiment of the present invention.
Fig. 4 is a diagram showing a refrigeration cycle system according to an embodiment of the present invention.
Description of the symbols
1-a valve housing (valve body), 1A-a valve chamber, 11-a first port (valve port), 12-a second port (valve port), 13-a third port (valve port), 14-a first tapered portion (valve port), 15-a second tapered portion (valve port), 21-a first joint pipe, 22-a second joint pipe (secondary side joint pipe), 22A-a straight pipe portion, 22B-a bent pipe portion, 20 a-an end portion, 3-a support member, 4-a valve frame, 5-a needle valve (valve member), 6-a stepping motor, 21 '-a first joint pipe (secondary side joint pipe), 21A' -a straight pipe portion, 21B '-a bent pipe portion, 22' -a second joint pipe, 20 '-a bent pipe portion, 20 a' -an end portion, 10-an electric valve, 20-an outdoor heat exchanger, 30-an indoor heat exchanger, 40-a flow path switching valve, 50-a compressor.
Detailed Description
Next, embodiments of an electric valve and a refrigeration cycle system according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a main portion of an electric valve according to a first embodiment of the present invention, and fig. 2 is an enlarged sectional view of a main portion of the electric valve. Note that the concept of "top and bottom" in the following description corresponds to the top and bottom in the drawing of fig. 1.
The motor-operated valve 10 of this embodiment has a valve housing 1 as a "valve body" formed by cutting or the like a metal member such as stainless steel or brass, and a valve chamber 1A is formed in the valve housing 1. Further, the valve housing 1 is formed with a first port 11, a second port 12, and a third port 13, a first tapered portion 14 is formed between the first port 11 and the second port 12, and a second tapered portion 15 is formed between the second port 12 and the third port 13. A first joint pipe 21 communicating with the valve chamber 1A from the side surface side is attached to the valve housing 1, and a second joint pipe 22 is attached to one end portion of the valve chamber 1A in the axis X direction. The valve chamber 1A and the second joint pipe 22 can be communicated with each other through the first port 11, the first tapered portion 14, the second port 12, the second tapered portion 15, and the third port 13.
A long cylindrical rectifying pipe portion 20 protruding into the second joint pipe 22 is formed at the lower end of the valve housing 1. The first port 11, the second port 12, the third port 13, the first tapered portion 14, and the second tapered portion 15 are configured as a circular "valve port" having a cross-sectional shape centered on the axis X, and the "valve port" penetrates the rectifying pipe portion 20. Further, the relationship between the rectifying pipe portion 20 and the second joint pipe 22 is explained below.
A valve guide member 23 is press-fitted and caulked to the valve housing 1 so as to be inserted into the valve chamber 1A from above, and a valve guide hole 23a is formed in the center of the valve guide member 23. An edge 1a is formed at the upper end portion of the valve housing 1 so as to surround the upper end outer peripheral portion of the valve guide member 23, and a cylindrical housing 24 is assembled to the valve housing 1 so as to fit the outer periphery of the edge 1 a. The housing 24 is fixed to the valve housing 1 by riveting the edge 1a and brazing the bottom periphery. Further, the support member 3 is attached to the upper end opening of the housing 24 via a fixing metal fitting 31.
A female screw portion 3a coaxial with the axis X of the first port 11 and the like and a screw hole thereof are formed at the center of the support member 3, and a cylindrical slide hole 3b having a diameter larger than the outer periphery of the screw hole of the female screw portion 3a is formed. A valve holder 4 is slidably fitted in the slide hole 3b in the direction of the axis X, and the valve holder 4 holds a needle valve 5 as a "valve member" at a lower portion.
The valve frame 4 has a boss portion 42 fixed to a lower end of a cylindrical portion 41, and includes a spring seat 43, a compression coil spring 44, a washer 45, and a packing 46 in the cylindrical portion 41. The needle valve 5 is formed of a metal member such as stainless steel or brass, and has a needle portion 51 at the lower tip, a rod portion 52 in the shape of a cylindrical rod extending from the needle portion 51 in the direction of the axis X, and a flange portion 53 formed at the upper end of the rod portion 52. The needle valve 5 is inserted into the insertion hole 42a of the boss 42 of the valve frame 4, and the flange portion 53 is attached to the valve frame 4 by abutting against the boss 42. Further, the rod portion 52 of the needle valve 5 is inserted into the valve guide hole 23a of the valve guide member 23.
A case portion 25 is airtightly fixed to the upper end of the housing 24 by welding or the like, and a magnetic rotor 61 having an outer peripheral portion magnetized in multiple poles and a rotor shaft 62 fixed to the center thereof are provided in the case portion 25. The upper end of the rotor shaft 62 is rotatably fitted in a cylindrical guide 26, and the guide 26 is provided at the top of the housing 25. The rotor shaft 62 is formed with a male screw portion 62a, and the male screw portion 62a is screwed to a female screw portion 3a formed in the support member 3. A stator coil 63 is disposed on the outer periphery of the housing portion 25, and the magnetic rotor 61, the rotor shaft 62, and the stator coil 63 constitute the stepping motor 6. Then, a pulse signal is applied to the stator coil 63, and the magnetic rotor 61 is rotated according to the number of pulses, thereby rotating the rotor shaft 62. Further, a rotation stopper mechanism 27 for the magnetic rotor 61 is provided on the outer periphery of the guide 26.
Further, in the valve frame 4, the compression coil spring 44 is mounted between the spring seat 43 and the flange portion 53 of the needle 5 in a state of receiving a predetermined load, and the valve frame 4 abuts the spring seat 43 against the lower end portion of the packing 46 and presses the upper end portion of the packing 46 via the washer 45 at the upper end portion of the cylindrical portion 41. The flange 62b of the rotor shaft 62 is engaged between the washer 45 and the spacer 46, and is prevented from coming off by the washer 45. Thereby, the needle valve 5 is coupled to the rotor shaft 62 via the valve frame 4, and the rod portion 52 is guided to be movable in the axis X direction.
With the above configuration, when the stepping motor 6 is driven, the magnetic rotor 61 and the rotor shaft 62 rotate, and the rotor shaft 62 moves in the axis X direction by the screw feeding mechanism of the male screw portion 62a of the rotor shaft 62 and the female screw portion 3a of the support member 3. The needle valve 5 moves in the axis X direction together with the valve frame 4 by the axial movement X of the rotor shaft 62 accompanying this rotation. As described above, the needle valve 5 moves forward and backward in the direction of the axis X of the first port 11 in a state where the needle portion 51 is inserted into the first port 11, thereby increasing or decreasing the opening area of the first port 11. Then, the flow rate of the fluid (refrigerant) flowing from the first joint pipe 21 to the second joint pipe 22 is controlled. That is, in this example, the first joint pipe 21 is a primary side joint pipe, and the second joint pipe 22 is a secondary side joint pipe.
As shown in fig. 2, the second joint pipe 22 as a secondary joint pipe includes a straight pipe portion 22A connected to the valve housing 1 and a curved pipe portion 22B curved in a direction intersecting the straight pipe portion 22A (axis X), and a portion of the second joint pipe 22B at a tip end thereof extends in a direction parallel to the first joint pipe 21 (a direction perpendicular to the axis X). The end 20a of the rectifying pipe portion 20 in the direction of the axis L is located within the curved pipe portion 22B by a projecting length "H" from the boundary between the straight pipe portion 22A and the curved pipe portion 22B, and the end 20a of the rectifying pipe portion 20 is configured not to contact the pipe wall within the curved pipe portion 22B.
Thus, the end portion 20a of the rectifying pipe portion 20 in the direction of the axis L faces the inner wall of the curved pipe portion 22B, and therefore the fluid flowing out of the third port 13 of the rectifying pipe portion 20 collides with the inner wall of the curved pipe portion 22B of the second joint pipe 22 and flows through the second joint pipe 22. Therefore, the velocity of the fluid flowing at the second joint pipe 22 is decelerated, thereby reducing noise. Further, by bending the second joint pipe 22 laterally with respect to the rectifying pipe portion 20, when the fluid (refrigerant) flows from the second joint pipe 22 toward the first joint pipe 21, the flow velocity of the refrigerant reaching the rectifying pipe portion 20 is also decelerated by the bent pipe portion 22B, thereby reducing noise.
Preferably, the relation between the inner diameter "D" of the third port 13 and the inner diameter "D" of the straight tube portion 22A is d.gtoreq.D/2. In this way, by making the inner diameter of the third port 13 protruding into the curved pipe portion 22B larger than the radius of the inner diameter of the straight pipe portion 22A (second joint pipe 22), the fluid flowing out of the third port 13 easily collides with the inner wall of the second joint pipe 22. This makes it easy to decelerate the flow velocity of the fluid, thereby improving the silencing effect.
Further, the outer diameter of the rectifying pipe portion 20 can be increased to such an extent that it does not contact the inner wall of the second joint pipe 22. By preventing the outer diameter of the rectifying pipe portion 20 from contacting the inner wall of the second joint pipe, it is possible to suppress a decrease in the flow rate caused by the fluid flowing out from the opening of the third port 13 and colliding against the inner wall of the bent pipe portion 22B (second joint pipe 22) flowing back into the third port 13.
In the present embodiment, the curved pipe portion 22B is curved so as to extend in the same direction as the first joint pipe 21, but may be curved so as to extend in the opposite direction to the first joint pipe 21, or may be curved in any direction if the curved direction of the curved pipe portion 22B is, for example, a direction such that the fluid flowing out from the rectifying pipe portion 20 can collide with the inner wall of the curved pipe portion 22B, such as being substantially perpendicular to the straight pipe portion 22A. In particular, the bending direction of such a bent pipe portion is preferably selected according to the structure of, for example, a pipe of a refrigeration cycle.
Fig. 3 is a longitudinal sectional view of a main portion of an electric valve according to a second embodiment of the present invention, in which a second joint pipe 22 'is a primary joint pipe and a first joint pipe 21' is a secondary joint pipe. In the second embodiment, the configuration other than the first joint pipe 21 ', the second joint pipe 22 ', and the rectifying pipe portion 20 ' shown in fig. 3 is also the same as that of fig. 1.
In the second embodiment, the first joint pipe 21 'as the secondary joint pipe has a straight pipe portion 21A' connected to the valve housing 1 and a curved pipe portion 21B 'curved in a direction intersecting the straight pipe portion 21A', and a portion located at a tip end of the curved pipe portion 21B 'extends in a direction (the axis X direction) parallel to the second joint pipe 22'. Further, a flow straightening pipe portion 20' is provided so as to communicate with the valve chamber 1A. The straight tube portion 21A ' and the curved tube portion 21B ' are located within the curved tube portion 21B ' at the end 20a ' of the rectifying tube portion 20 ' in the direction intersecting the axis L. The end 20a ' of the rectifying pipe portion 20 ' is configured not to contact the pipe wall in the curved pipe portion 21B '.
Similarly, in the second embodiment, the fluid flowing out from the valve chamber 1A to the first joint pipe 21 ' through the flow-straightening pipe portion 20 ' collides with the inner wall of the bent pipe portion 21B ' of the first joint pipe 21 ' and flows through the first joint pipe 21 '. Therefore, the velocity of the fluid flowing at the first joint pipe 21' is decelerated, thereby reducing noise.
Further, as in the first embodiment, in the second embodiment, the curved pipe portion 21B 'may be curved in any direction if the curved direction is, for example, a direction such that the fluid flowing out of the rectifying pipe portion 20' collides with the inner wall of the curved pipe portion 21B 'substantially perpendicular to the straight pipe portion 21A'. The bending direction of the bent pipe portion is preferably selected according to the structure of a pipe or the like of the refrigeration cycle, for example.
In the first embodiment described above, the example in which the bent pipe portion is provided in the second joint pipe is shown, and in the second embodiment, the example in which the bent pipe portion is provided in the first joint pipe is shown, but an electric valve may be provided in which a rectifying pipe portion is provided in both the first joint pipe and the second joint pipe, and the bent pipe portion is provided in both the first joint pipe and the second joint pipe so that the inner wall faces the end portion of the rectifying pipe portion.
Fig. 4 is a diagram showing a refrigeration cycle of the embodiment, and is an example of a refrigeration cycle of an air conditioner. The air conditioner includes an electrically operated valve 10 as an expansion valve in an embodiment, an outdoor heat exchanger 20 mounted on an outdoor unit 100, an indoor heat exchanger 30 mounted on an indoor unit 200, a flow path switching valve 40, and a compressor 50, and the respective elements are connected by conduits as shown in the drawing to constitute a heat pump refrigeration cycle. This refrigeration cycle is an example of a refrigeration cycle to which the electric valve of the present invention is applied, and the electric valve of the present invention can also be applied to other systems such as an indoor unit-side throttle device of a complex air conditioner for a building.
The flow path of the refrigeration cycle is switched by the flow path switching valve 40 to two flow paths, i.e., a heating mode in which the refrigerant compressed by the compressor 50 flows from the flow path switching valve 40 into the indoor heat exchanger 30 and a cooling mode in which the refrigerant flowing out of the indoor heat exchanger 30 flows into the electric valve 10 through the pipe line 60, as indicated by solid arrows. The refrigerant is expanded in the motor-operated valve 10 and circulates through the outdoor heat exchanger 20, the flow path switching valve 40, and the compressor 50 in this order. In the cooling mode, as indicated by a broken-line arrow, the refrigerant compressed by the compressor 50 flows into the outdoor heat exchanger 20 from the flow path switching valve 40, and the refrigerant flowing out of the outdoor heat exchanger 20 is expanded in the motor-operated valve 10, flows through the pipe line 60, and flows into the indoor heat exchanger 30. The refrigerant having flowed into the indoor heat exchanger 30 flows into the compressor 50 through the flow path switching valve 40. In the example shown in fig. 4, the refrigerant flows from the primary joint pipe 21 to the secondary joint pipe 22 of the electric valve 10 in the heating mode, but the connection of the pipes may be reversed, and the refrigerant may flow from the secondary joint pipe 22 to the primary joint pipe 21 in the heating mode.
The motor-operated valve 10 functions as an expansion valve (an expansion device) that controls the flow rate of the refrigerant, and in the heating mode, the outdoor heat exchanger 20 functions as an evaporator, and the indoor heat exchanger 30 functions as a condenser, thereby heating the inside of the room. In the cooling mode, the outdoor heat exchanger 20 functions as a condenser, and the indoor heat exchanger 30 functions as an evaporator, thereby cooling the inside of the room.
While the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to the above embodiments, and the present invention includes design changes and the like within a range not departing from the gist of the present invention.
Claims (6)
1. An electric valve in which a first joint pipe and a second joint pipe are respectively communicated with a valve chamber of a valve body, one of the first joint pipe and the second joint pipe is used as a primary side joint pipe through which a fluid flows in, and the other is used as a secondary side joint pipe through which the fluid flows out, the electric valve being characterized in that,
the valve body is provided with a long cylindrical rectifying pipe portion which communicates with the valve chamber and protrudes into the secondary side joint pipe, the secondary side joint pipe includes a straight pipe portion connected to the valve body and a curved pipe portion which is curved from the straight pipe portion, and an end portion of the rectifying pipe portion is disposed so as to face the curved pipe portion of the secondary side joint pipe.
2. Electrically operated valve according to claim 1,
an end of the rectifying pipe portion is disposed on the curved pipe portion side with respect to a boundary between the straight pipe portion and the curved pipe portion of the secondary side joint pipe.
3. Electrically operated valve according to claim 1 or 2,
the inner diameter "D" of the inner passage of the rectifying pipe portion and the inner diameter "D" of the straight pipe portion of the secondary side joint pipe are in a relationship that D is not less than D/2.
4. Electrically operated valve according to any of claims 1 to 3,
the first joint pipe and the second joint pipe are connected to the valve body in a direction intersecting the valve chamber.
5. Electrically operated valve according to any of the claims 1 to 4,
the inner passage of the rectifying pipe portion constitutes a valve port that opens into the valve chamber and has an opening area that is increased or decreased by a valve member.
6. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve, and an evaporator,
use of an electrically operated valve as claimed in any one of claims 1 to 5 as said expansion valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-193956 | 2019-10-25 | ||
| JP2019193956A JP7199335B2 (en) | 2019-10-25 | 2019-10-25 | Electric valve and refrigeration cycle system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112709860A true CN112709860A (en) | 2021-04-27 |
| CN112709860B CN112709860B (en) | 2023-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011075550.1A Active CN112709860B (en) | 2019-10-25 | 2020-10-09 | Electric valve and refrigeration cycle system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7199335B2 (en) |
| CN (1) | CN112709860B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024021964A1 (en) * | 2022-07-27 | 2024-02-01 | 广东威灵电机制造有限公司 | Electronic expansion valve assembly, electronic expansion valve and refrigeration apparatus |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112709860B (en) | 2023-03-24 |
| JP7199335B2 (en) | 2023-01-05 |
| JP2021067329A (en) | 2021-04-30 |
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