Patent Grant
10254030
This application is a U.S. national stage application of International Application No. PCT/JP2014/075670 filed on Sep. 26, 2014, the disclosure of which is incorporated herein by reference.
The present invention relates to a refrigeration cycle device.
A known conventional refrigeration cycle device includes: an indoor unit in which a casing having an inlet and an outlet houses a heat exchanger and a fan; and a sensor that is provided on an outer surface of the casing of the indoor unit and detects a refrigerant gas, wherein when the sensor detects the refrigerant gas, a control portion performs control to rotate the fan (for example, see PTL 1).
[PTL 1] JP 2002-098393 A
However, the conventional refrigeration cycle device disclosed in PTL 1 requires power for operating the sensor and the fan when detecting a leak of a refrigerant. Thus, the refrigeration cycle device does not function if the refrigerant leaks in a situation where the refrigeration cycle device is not energized such as when stored in a warehouse or the like, when repaired, or when relocated.
For this reason, if the refrigerant leaks from a refrigerant pipe or the like in the casing of the refrigeration cycle device in a nonenergized state and the leaking refrigerant flows out into a room or the like, a region having a certain refrigerant concentration or higher may be formed in the room or the like.
The present invention is achieved to solve such a problem, and has an object to provide a refrigeration cycle device that uses a refrigerant having a higher concentration than air under atmospheric pressure, and is capable of preventing a region having a certain refrigerant concentration or higher from being formed even if the refrigerant leaks from a refrigerant pipe or the like in a casing of the refrigeration cycle device in a nonenergized state and the leaking refrigerant flows out of the casing.
A refrigeration cycle device according to the present invention includes: a casing having a first opening and a second opening, one of which is an inlet and the other of which is an outlet, and having therein an air course providing communication between the first opening and the second opening; and a refrigerant circuit provided in the air course in the casing and filled with a refrigerant having a higher concentration than air under atmospheric pressure, the casing having a third opening providing communication between the air course and outside of the casing, the third opening being arranged below the refrigerant circuit, and a lower edge of the third opening being located below lower edges of the first opening and the second opening, the refrigeration cycle device further comprising diffusion means configured to diffuse the refrigerant leaking from the refrigerant circuit and flowing from the air course through the third opening out of the casing.
The refrigeration cycle device according to the present invention has an advantage that the refrigeration cycle device uses a refrigerant having a higher concentration than air under atmospheric pressure, and is capable of preventing a region having a certain refrigerant concentration or higher from being formed even if the refrigerant leaks from a refrigerant pipe or the like in a casing of the refrigeration cycle device in a nonenergized state and the leaking refrigerant flows out of the casing.
The present invention will be described with reference to the accompanying drawings. Throughout the drawings, like reference numerals denote like or corresponding components, and overlapping descriptions thereof will be simplified or omitted as appropriate.
As shown in
The refrigerant gas filling the refrigerant pipe 30 desirably has a low global warming potential (GWP) in terms of global environment. Also, the refrigerant gas filling the refrigerant pipe 30 is a flammable gas. The refrigerant has a higher concentration than air under atmospheric pressure, and has a property of falling down in air in a direction of gravitational force.
Such a refrigerant includes, specifically for example, a (mixed) refrigerant consisting of one or more refrigerants selected from tetrafluoropropene (CF3CF═CH2:HFO-1234yf), difluoromethane (CH2F2:R32), propane (R290), propylene (R1270), ethane (R170), butane (R600), isobutane (R600a), 1.3.3.3-tetrafluoro-1-propene (CF3-CH═CHF:HFO-1234ze), or the like.
In the refrigerant pipe 30 on one side of a refrigerant circulation path between the indoor unit heat exchanger 11 and the outdoor unit heat exchanger 21, a compressor 24 is provided via a four-way valve 23. The compressor 24 is a device for compressing a supplied refrigerant to increase pressure and temperature of the refrigerant. As the compressor 24, for example, a rotary compressor, a scroll compressor, or the like may be used. In the refrigerant pipe 30 on the other side of the circulation path, an expansion valve 25 is provided. The expansion valve 25 expands a flowing refrigerant to reduce pressure of the refrigerant. The four-way valve 23, the compressor 24, and the expansion valve 25 are provided in the outdoor unit 20.
The refrigerant pipe 30 on the side of the indoor unit 10 and the refrigerant pipe 30 on the side of the outdoor unit 20 are connected by a metal joint such as a coupling. Specifically, an indoor unit metal joint 13 is provided in the refrigerant pipe 30 in the indoor unit 10. An outdoor unit metal joint 26 is provided in the refrigerant pipe 30 in the outdoor unit 20. Via the refrigerant pipe 30 between the indoor unit metal joint 13 and the outdoor unit metal joint 26, the refrigerant pipe 30 on the side of the indoor unit 10 and the refrigerant pipe 30 on the side of the outdoor unit 20 are connected to form the refrigerant circulation path.
The refrigerant circulation path formed by the refrigerant pipe 30 as well as the indoor unit heat exchanger 11, the outdoor unit heat exchanger 21, the four-way valve 23, the compressor 24, and the expansion valve 25 connected on the circulation path by the refrigerant pipe 30 constitute a refrigeration cycle.
The refrigeration cycle thus configured serves as a heat pump that performs heat exchange between the refrigerant and air in each of the indoor unit heat exchanger 11 and the outdoor unit heat exchanger 21 to move heat between the indoor unit 10 and the outdoor unit 20. In this case, switching the four-way valve 23 can reverse a refrigerant circulation direction in the refrigeration cycle to switch between a cooling operation and a heating operation.
Hereinafter, a part or the whole of the refrigeration cycle thus configured is referred to as a refrigerant circuit. Specifically, the refrigerant circuit refers to a part or all of the refrigerant pipe 30, the indoor unit heat exchanger 11, the outdoor unit heat exchanger 21, the four-way valve 23, the compressor 24, the expansion valve 25, the indoor unit metal joint 13, and the outdoor unit metal joint 26.
The indoor unit 10 and the outdoor unit 20 each have a casing. The casing of the indoor unit 10 houses the refrigerant pipe 30 filled with the refrigerant as well as the indoor unit heat exchanger 11, the indoor unit fan 12, and the indoor unit metal joint 13. The casing of the outdoor unit 20 also houses the refrigerant pipe 30 filled with the refrigerant as well as the outdoor unit heat exchanger 21, the outdoor unit fan 22, the four-way valve 23, the compressor 24, the expansion valve 25, and the outdoor unit metal joint 26.
Now, the indoor unit 10 will be particularly described. As shown in
As described above, the indoor unit 10 includes the indoor unit heat exchanger 11 and the indoor unit fan 12. The indoor unit heat exchanger 11 is arranged and housed in an upper position in the casing 40 of the indoor unit 10. The indoor unit fan 12 is arranged and housed in a lower position in the casing 40.
Two refrigerant pipes 30 are arranged on a lateral side of the indoor unit heat exchanger 11 in the casing 40. The refrigerant pipes 30 include a gas pipe through which the filling refrigerant flows in the form of a gas, and a liquid pipe through which the filling refrigerant flows in the form of a liquid. The refrigerant pipes 30 are substantially vertically arranged on the lateral side of the indoor unit heat exchanger 11. One end of each refrigerant pipe 30 is connected to the indoor unit heat exchanger 11. The other end on a lower side of each refrigerant pipe 30 is connected via the indoor unit metal joint 13 to the refrigerant pipe on the side of the outdoor unit 20. The indoor unit metal joint 13 is also housed in the casing 40.
The casing 40 also houses an electronic circuit substrate 50 on which a control circuit for controlling an operation of the indoor unit 10 is mounted.
As shown in
The refrigerant circuit 31 shown in
In the casing 40, an air course is formed that passes from the first opening 41 as the inlet through the indoor unit fan 12 and the refrigerant circuit 31 to the second opening 42 as the outlet. In other words, an air course that provides communication between the first opening 41 and the second opening 42 is formed in the casing 40. The refrigerant circuit 31 is provided in the air course. As described above, the refrigerant circuit 31 is filled with the refrigerant having a higher concentration than air under atmospheric pressure.
Further, the casing 40 has a third opening 43 that provides communication between the air course formed in the casing 40 and the outside of the casing 40. Also with reference to
Also, more preferably, the third opening 43 is positioned so that an upper edge of the third opening 43 rather than the lower edge of the third opening 43 is located below the lower edges of the first opening 41 and the second opening 42. The third opening 43 illustrated in
The third opening 43 may be provided as an assembly of a plurality of openings.
As shown in
A case is considered where the refrigerant leaks from the refrigerant circuit 31 in the casing 40 of the indoor unit 10 in the refrigeration cycle device configured as described above. As described above, the refrigerant used here has a higher concentration than air under atmospheric pressure. Thus, the refrigerant has a property of falling down in air under atmospheric pressure. Therefore, in such a case, as shown in
The refrigerant having reached the bottom of the air course then flows forward or backward or to right or left. The air course in the casing 40 communicates with the outside of the casing 40 through the first opening 41 and the second opening 42 as the inlet and the outlet as well as the third opening 43. At least the lower edge of the third opening 43 is arranged vertically below the lower edges of the first opening 41 and the second opening 42. Thus, the refrigerant having reached the bottom of the air course first flows through the third opening 43 out of the casing 40.
Then, when the refrigerant flows through the third opening 43 out of the casing 40, the first guide surface of the first guide plate 44a as the diffusion means diffuses the refrigerant. More specifically, as shown in
Here, the first guide plate 44a having the first guide surface directed upward to the horizontal is provided as the diffusion means. However, an opening surface itself of the third opening 43 may be provided to be directed upward to the horizontal so that the third opening 43 itself functions as the diffusion means.
The refrigeration cycle device configured as described above includes: the casing 40 having the first opening 41 and the second opening 42, one of which is the inlet and the other of which is the outlet, and having therein the air course providing communication between the first opening 41 and the second opening 42; and the refrigerant circuit 31 provided in the air course in the casing 40 and filled with the refrigerant having a higher concentration than air under atmospheric pressure. The casing 40 also has the third opening 43 providing communication between the air course and the outside of the casing 40, and the third opening 43 is arranged below the refrigerant circuit 31 and so that the lower edge of the third opening 43 is located below the lower edges of the first opening 41 and the second opening 42. The refrigeration cycle device also includes the first guide surface of the first guide plate 44a as the diffusion means for diffusing the refrigerant leaking from the refrigerant circuit 31 and flowing from the air course through the third opening 43 out of the casing 40.
Thus, even if the refrigerant leaks from the refrigerant pipe or the like in the casing of the refrigeration cycle device in a nonenergized state and the leaking refrigerant flows out of the casing, a region having a certain refrigerant concentration or higher can be prevented from being formed.
Embodiment 2 described here is such that a plurality of third openings are provided, and an area of an opening in a relatively vertically lower position is smaller than an area of an opening in a relatively vertically upper portion in the configuration of Embodiment 1 described above.
First, with reference to
A vertical dimension of the third opening (top) 43a is x, a vertical dimension of the third opening (middle) 43b is y, and a vertical dimension of the third opening (bottom) 43c is z. In this case, x is larger than y, and y is larger than z. Specifically, x, y and z have the following relationship.
x>y>z
For these dimensions, specifically for example, x may be 10 mm, y may be 5 mm, and z may be 2 mm, or the like.
Lateral dimensions of the third opening (top) 43a, the third opening (middle) 43b, and the third opening (bottom) 43c are equal. Thus, the third opening (top) 43a, the third opening (middle) 43b, and the third opening (bottom) 43c are formed so that the area of the opening in the relatively lower position is smaller than the area of the opening in the relatively upper portion.
Next, with reference to
A diameter of one opening that constitutes the third opening (top) 43a is x, a diameter of one opening that constitutes the third opening (middle) 43b is y, and a diameter of one opening that constitutes the third opening (bottom) 43c is z. In this case, x is larger than y, and y is larger than z. Specifically, x, y and z have a relationship of x>y>z as in the first example.
In this second example, the third openings 43 are arranged vertically and also laterally. However, the openings in the lateral direction belong to the same opening group among the third opening (top) 43a, the third opening (middle) 43b, and the third opening (bottom) 43c. The openings are formed so that a sum of areas of the openings in the opening group in a relatively lower position is smaller than areas of the openings in a relatively upper position.
As such, in Embodiment 2, the plurality of third openings 43 are at least vertically provided. For the third opening (top) 43a, the third opening (middle) 43b, and third opening (bottom) 43c as the plurality of third openings 43, the sum of areas of the openings in the opening group in the relatively lower position is smaller than the sum of areas of the openings in the opening group in the relatively upper position. Other configurations are the same as in Embodiment 1, and detailed descriptions thereof will be omitted.
A case is considered where the refrigerant leaks from the refrigerant circuit 31 in the casing 40 of the indoor unit 10 in the refrigeration cycle device configured as described above. As described above, the refrigerant used here has a higher concentration than air under atmospheric pressure. Thus, the refrigerant has a property of falling down in air under atmospheric pressure. Therefore, in such a case, as shown in
The refrigerant having reached the bottom of the air course first flows through the third openings 43 out of the casing 40 rather than flows through the first opening 41 and the second opening 42 as described in Embodiment 1. Here, the third openings 43 consisting of the plurality of openings at least vertically arranged are formed so that the area of the opening in the relatively lower position is smaller than the area of the opening in the relatively upper position.
Thus, the refrigerant in the lower position having a relatively higher concentration flows through the third opening (bottom) 43c having a smaller opening area out of the casing 40. On the other hand, the refrigerant in the upper position having a relatively lower concentration flows through the third opening (top) 43a having a larger opening area out of the casing 40. The refrigerant flowing out through the third opening (middle) 43b in the middle seems to have an intermediate concentration between the concentrations of the refrigerant flowing through the third opening (top) 43a and the third opening (bottom) 43c.
Thus, since an amount of refrigerant flowing out through the opening in the lower position close to the floor surface among the third openings 43 can be reduced, amounts of refrigerant flowing out through the third openings 43 can be vertically equalized. When the refrigerant having a higher concentration than air under atmospheric pressure leaks from the refrigerant circuit, the refrigerant vertically flows downward in the indoor unit, flows along a bottom surface of the indoor unit, and is discharged through the third opening 43 into the room.
In particular, if a velocity of the refrigerant leaking from the refrigerant circuit 31 is high (for example, 10 kg/h), a velocity of a flow of the leaking refrigerant at the bottom of the air course is also high. If a large amount of refrigerant flows out at the high flow velocity through the opening in the lower position among the third openings 43, the leaking refrigerant may collect in the lower position to locally increase the refrigerant concentration. In the refrigeration cycle device according to Embodiment 2, as described above, the amount of refrigerant flowing out through the third openings 43 can be vertically equalized, which effectively prevents the leaking refrigerant from locally collecting in such a case.
Embodiment 3 described here is such that a second guide surface extending laterally outward from inside toward outside of a casing is provided as diffusion means in a third opening in the configuration of Embodiment 1 or 2 described above.
The plurality of openings that constitute the third openings 43 are provided in positions closer to laterally outer sides in a front surface of the casing 40, rather than in a laterally middle position in the front surface. Here, a direction approaching a lateral center in the front surface of the casing 40 is referred to as “inward direction”, while a direction apart from the lateral center in the front surface of the casing 40 is referred to as “outward direction”.
As shown in
As the diffusion means, only such a second guide plate 44b may be provided, or both the first guide plate 44a described in Embodiment 1 and the second guide plate 44b may be provided. Also, the guide surface may be inclined upward to the horizontal and laterally outward to the front from inside toward outside of the casing 40. Further, it is only necessary that the diffusion means directs the flow of the refrigerant in directions other than forward.
Further,
If the refrigerant leaks from the refrigerant circuit 31 in the casing 40 of the indoor unit 10 in the refrigeration cycle device configured as described above, the refrigerant first flows through the third opening 43 out of the casing 40 rather than flows through the first opening 41 and the second opening 42 as described in Embodiment 1. In this case, the second guide surface of the second guide plate 44b as the diffusion means diffuses the refrigerant.
More specifically, as shown by an arrow in a refrigerant diffusion direction 62 in
Embodiment 4 described here is such that a rotor that is rotatable by a flow of a refrigerant leaking from a refrigerant circuit is provided as diffusion means to face a third opening in the configuration of any of Embodiments 1 to 3 described above.
Specifically, as shown in
A case is considered where the refrigerant leaks from the refrigerant circuit 31 in the casing 40 of the indoor unit 10 in the refrigeration cycle device configured as described above. As described above, the refrigerant having a property of falling down vertically flows downward through the air course in the casing 40 as shown by an arrow of a flow 61 of the leaking refrigerant in
Here, the rotor 46 is arranged to face the third opening 43, and is arranged on a flow path of the leaking refrigerant flowing through the third opening 43 out of the casing 40. Thus the flowing leaking refrigerant hits and pushes the rotor 46, and thus the rotor 46 is rotated. When the rotor 46 is rotated, the flow of the leaking refrigerant flowing through the third opening 43 out of the casing 40 is disturbed.
Thus, the rotor 46 as the diffusion means diffuses the refrigerant flowing through the third opening 43 out of the casing 40 as shown by an arrow of a refrigerant diffusion direction 62 in
Other configurations are similar to those in Embodiment 1, and descriptions thereof will be omitted.
Next,
With reference to
The load side heat exchanger 71 and the load side metal joint 73 are housed in a heat exchanger chamber 75. The heat exchanger chamber 75 corresponds to the casing 40 in the example of the indoor unit 10 described above. A load unit inlet 76 is formed in an upper portion of the heat exchanger chamber 75 and above the load side heat exchanger 71 and the load side metal joint 73. A load unit outlet 77 is formed in a lower portion of the heat exchanger chamber 75 and below the load side heat exchanger 71 and the load side metal joint 73.
A load unit rotor 80 is installed further below the load unit outlet 77. The load unit rotor 80 corresponds to the rotor 46 in the example of the indoor unit 10 described above. Specifically, the load unit rotor 80 constitutes diffusion means for diffusing a refrigerant leaking from the load side heat exchanger 71 and the load side metal joint 73 or the like and flowing through the load unit outlet 77.
This example of the heat pump water heater is different from the example of the indoor unit 10 described above in that no third opening is provided and that the load unit rotor 80 is provided outside the heat exchanger chamber 75. However, these examples use a rotor as diffusion means for diffusing a leaking refrigerant in common, and an application of such a rotor is described here.
A case is considered where a refrigerant leaks from the load side heat exchanger 71 and the load side metal joint 73 or the like in the heat exchanger chamber 75 in the heat pump water heater thus configured. The refrigerant used here also has a higher concentration than air under atmospheric pressure and has a property of falling down in air under atmospheric pressure. Thus, in such a case, the leaking refrigerant flows downward in the heat exchanger chamber 75 and flows from the load unit outlet 77 out of the heat exchanger chamber 75.
Then, the refrigerant having flowed through the load unit outlet 77 out of the heat exchanger chamber 75 hits and rotates the load unit rotor 80. When the load unit rotor 80 is rotated, the flow of the leaking refrigerant flowing through the load unit outlet 77 out of the heat exchanger chamber 75 is disturbed. Specifically, the leaking refrigerant having a high concentration and having flowed through the load unit outlet 77 passes through the load unit rotor 80, so that the refrigerant is mixed with air to have a low concentration, and is diffused.
With the rotor 46 as the diffusion means, the refrigeration cycle device configured as described above can achieve the same advantage as Embodiment 1 or the like described above. The rotor 46 may be combined with one or both of the first guide plate 44a and the second guide plate 44b described above as diffusion means to achieve a synergistic effect.
Embodiment 5 described here is such that a shutter for opening/closing a third opening is provided in the configuration of any of Embodiments 1 to 4 described above.
First,
In normal times, the shutter 45 is arranged in a position shown in
Thus, during operation of the indoor unit fan 12, negative pressure generated by the indoor unit fan 12 sucks the shutter 45 toward the air course in the casing 40. Thus, the shutter 45 is held in the position to close the third opening 43 shown in
On the other hand, during stop of the indoor unit fan 12, no force to suck the shutter 45 toward the air course in the casing 40 is generated. In this state, if the refrigerant leaks from the refrigerant circuit 31 in the casing 40 of the indoor unit 10, the refrigerant having a property of falling down travels downward in the casing 40 as shown by an arrow of a flow 61 of the leaking refrigerant in
Then, the refrigerant having reached the bottom of the casing 40 travels horizontally along the bottom of the casing 40 and pushes the shutter 45 from inside toward outside of the casing 40, and the shutter 45 is placed in the position shown in
In this case, the shutter 45 pivots around the shaft 45a at the lower end, abuts against the lower edge of the third opening 43, and stops pivoting in the position shown in
The shutter 45 may simply open/close the third opening 43, and as in an example described below, any of the first guide plate 44a, the second guide plate 44b, and the rotor 46 described in Embodiments 1, 3 and 4 or a combination thereof may be used as diffusion means.
Next, with reference to
When a product is operated (when the refrigerant circuit 31 is operated), the shutter 45 is in the position shown in
In any examples of Embodiment 5 described above, other configurations are similar to those in Embodiment 1, and descriptions thereof will be omitted.
The refrigeration cycle device configured as described above can achieve the same advantage as any of Embodiments 1 to 4 described above. In addition, at normal times or during operation of the refrigerant circuit 31, the shutter 45 can close the third opening 43 communicating with the air course in the casing 40 to prevent pressure loss in the air course.
Embodiment 6 described here is such that a guidepath is provided in a casing in the configuration of any of Embodiments 1 to 5 described above.
Specifically, as shown in
In the refrigeration cycle device thus configured, a refrigerant having leaked from the refrigerant circuit 31 in the casing 40 and having a property of falling down is guided by the guidepath 47 to the third opening 43. Thus, the refrigerant quickly reaches the third opening 43 after leaking, and the diffusion means can diffuse the leaking refrigerant. Also, the leaking refrigerant can be prevented from flowing through openings other than the third opening 43 out of the casing 40, thereby maximizing a capability of the diffusion means.
The shape of the guidepath 47 is not limited to that illustrated in
Other configurations are similar to those in any of Embodiments 1 to 5, and descriptions thereof will be omitted.
The present invention can be used in a refrigeration cycle device including a casing that houses a refrigerant circuit filled with a refrigerant having a higher concentration than air under atmospheric pressure, specifically for example, a refrigeration cycle device in an indoor unit and an outdoor unit of a floor-type, ceiling-mounted, or wall-mounted air conditioner, a water heater, a showcase, and a refrigerator, or the like.
10 Indoor Unit, 11 Indoor Unit Heat Exchanger, 12 Indoor Unit Fan, 13 indoor unit metal joint, 20 Outdoor Unit, 21 Outdoor Unit Heat Exchanger, 22 Outdoor Unit Fan, 23 Four-Way Valve, 24 Compressor, 25 Expansion Valve, 26 Outdoor Unit Metal Joint, 30 Refrigerant Pipe, 31 Refrigerant Circuit, 40 Casing, 41 First Opening, 42 Second Opening, 43 Third Opening, 43a Third Opening (Top), 43b Third Opening (Middle), 43c Third Opening (Bottom), 44a First Guide Plate, 44b Second Guide Plate, 45 Shutter, 45a Shaft, 46 Rotor, 47 Guidepath, 50 Electronic Circuit Substrate, 61 Flow of Leaking Refrigerant, 62 Refrigerant Diffusion Direction, 70 Load Unit, 71 Load Side Heat Exchanger, 72 Refrigerant Flow Path, 73 Load Side Metal Joint, 74 Water Flow Path, 75 Heat Exchanger Chamber, 76 Load Unit Inlet, 77 Load Unit Outlet, 80 Load Unit Rotor
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2014/075670 | 9/26/2014 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2016/046964 | 3/31/2016 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20020178738 | Taira | Dec 2002 | A1 |
| 20090229289 | Ohmae | Sep 2009 | A1 |
| 20140053591 | Shin et al. | Feb 2014 | A1 |
| Number | Date | Country |
|---|---|---|
| H09-324928 | Dec 1997 | JP |
| H11-304626 | Nov 1999 | JP |
| 2001-263919 | Sep 2001 | JP |
| 2002-098346 | Apr 2002 | JP |
| 2002-098393 | Apr 2002 | JP |
| 2002-115939 | Apr 2002 | JP |
| 2002-188878 | Jul 2002 | JP |
| 2002188878 | Jul 2002 | JP |
| 2005069652 | Mar 2005 | JP |
| 2011-127847 | Jun 2011 | JP |
| Entry |
|---|
| Office action dated Oct. 24, 2017 in the corresponding EP patent application No. 14 902 477.0. |
| International Preliminary Report on Patentability of Apr. 6, 2017 in the corresponding international application No. PCT/JP2014/075670. |
| International Search Report of the International Searching Authority dated Dec. 22, 2014 for the corresponding international application No. PCT/JP2014/075670 (and English translation). |
| Number | Date | Country | |
|---|---|---|---|
| 20170234592 A1 | Aug 2017 | US |
