JPH1047751A - Air conditioner using combustible refrigerant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure high safety against leakage of a refrigerant in an air conditioner using a combustible refrigerant. SOLUTION: An internal chamber 2 of a casing 1 of an indoor machine Z1 is divided with a partition wall 7 into a first chamber 2A facing to a suction hole 3 and a blowoff hole 4 and a second chamber 2B isolated airtightly from the first chamber A, and a heat exchanger 5 is disposed on the side of the second chamber 2B, and further air flowing through the first chamber 2A side is heat exchanged with the second chamber 2B side with the aid of heat conduction and transfer action through the partition wall 7. With such construction, even if there is produced leakage of a refrigerant in the heat exchanger 5, the leaking refrigerant stays in the second chamber 2B and hence results in no leakage from the second chamber 2B to the first chamber 2A side. Thus, the leaking refrigerant is securely prevented from leaking to the first chamber 2A side and diffusing to an indoor side together with air conditioning air, and hence there is secured safety on the operation of the air conditioner irrespective of leakage or non-leakage of a combustible refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a flammable refrigerant such as propane or butane.

[0002]

2. Description of the Related Art In recent years, in response to the increasing awareness of global environmental conservation, the refrigerant used in air conditioners has been replaced by an ozone layer instead of a conventional CFC refrigerant. Attention has been paid to natural refrigerants such as propane and butane, which have very little impact on destruction or global warming.

[0003]

However, natural refrigerants such as propane and butane have a unique property of "flammable", unlike fluorocarbon refrigerants and the like conventionally used. For this reason, when using a flammable refrigerant as a refrigerant, the structure of a conventional air conditioner that uses a non-flammable refrigerant such as chlorofluorocarbon and has not paid much attention structurally to leakage of the refrigerant is used as it is. It cannot be applied, and it is desired to adopt a structure that takes sufficient measures against leakage of the refrigerant.

Therefore, the present invention has been made in an air conditioner using such a flammable refrigerant in order to ensure high safety against leakage of the refrigerant.

[0005]

Means for Solving the Problems In the present invention, the following configuration is adopted as specific means for solving such problems.

According to the first aspect of the present invention, in an air conditioner using a flammable refrigerant as a refrigerant, an inner chamber 2 of a casing 1 of an indoor unit Z ₁ disposed on the indoor side is replaced with the casing 1.
The inlet 3 and the outlet 4 are defined by a partition wall 7 arranged in the inside.
And a second chamber 2B airtightly isolated from the first chamber 2A.
The heat exchanger 5 is arranged on the B side, and the air circulating in the first chamber 2A side and the refrigerant circulating in the heat exchanger 5 on the second chamber 2B side by the conductive heat transfer action via the partition wall 7 The structure is such that heat exchange is performed between the two.

According to a second aspect of the present invention, in the air conditioner using a flammable refrigerant according to the first aspect, the heat exchanger 5 is transferred to a wall surface of the partition wall 7 on the second chamber 2B side. The heat pipe 6 is configured to be in close contact with the heat transfer pipe 6, and a heat insulating material 9
It is characterized by having provided.

According to a third aspect of the present invention, in the air conditioner using a flammable refrigerant according to the second aspect, the heat exchanger 5 extends in a substantially horizontal direction along the wall surface of the partition wall 7. A plurality of straight tubular heat transfer tubes 6, 6,... Are arranged at predetermined intervals in the vertical direction, and the end portions of the heat transfer tubes 6, 6,. ,
The flow direction of the refrigerant in the heat exchanger 5 is set in a direction from the downstream side to the upstream side of the air flow in the first chamber 2A.

According to a fourth aspect of the present invention, in the air conditioner using a flammable refrigerant according to the third aspect, the ends of the heat transfer tubes 6, 6,. The pipes 15a, 1
It is characterized in that it is made continuous through the conduit plates 15 and 16 formed with 6a.

In the fifth invention of the present application, the first, second, and
An air conditioner using a flammable refrigerant according to the third or fourth aspect of the invention is characterized in that fins 8, 17 are provided on a wall surface of the partition wall 7 on the first chamber 2A side.

In the sixth invention of the present application, the first, second, and second
An air conditioner using a flammable refrigerant according to the third or fourth invention is characterized in that the partition wall 7 is formed in a corrugated shape.

In the seventh invention of the present application, the first, second, and second
An air conditioner using a flammable refrigerant according to the third, fourth, fifth, or sixth invention is characterized in that the second chamber 2B is provided with an exhaust port 10 communicating with the outside.

According to an eighth aspect of the present invention, in the air conditioner using a flammable refrigerant as the refrigerant, the heat exchangers 22 of the indoor units Z ₂ and Z ₃ disposed on the indoor side are disposed so as to intersect with the air flow path. At the same time, a closed box 30 for hermetically surrounding the joints 26, 27 of the heat transfer tubes 24, 24,... Is provided outside the tube sheet 23 arranged at the widthwise end of the heat exchanger 22. It is characterized by:

According to a ninth aspect of the present invention, in the air conditioner using a flammable refrigerant according to the eighth aspect, the heat transfer tube 24 is formed by bending a long tube in multiple layers. It is characterized by.

According to a tenth aspect of the present invention, in the air conditioner using a flammable refrigerant according to the eighth or ninth aspect, an exhaust port 33 communicating with the closed box 30 outdoors is provided. And

According to an eleventh aspect of the present invention, in the air conditioner using the flammable refrigerant according to the eighth, ninth or tenth aspect, the refrigerant leaking into the closed box 30 is placed in the closed box 30. It is characterized in that refrigerant leak detecting means 32 for detecting is provided.

[0017]

According to the present invention, the following effects can be obtained by adopting such a configuration.

[0018] (a) According to the first air conditioner using such a flammable refrigerant to the invention of the present application, inlet 3 and outlet the interior 2 of the casing 1 of the indoor unit Z ₁ by a partition wall 7 4
And a second chamber 2B airtightly isolated from the first chamber 2A.
The heat exchanger 5 is disposed on the B side, and heat exchange between the air flowing through the first chamber 2A and the second chamber 2B is performed by the conductive heat transfer through the partition wall 7. Therefore, even if the refrigerant leaks in the heat exchanger 5, the leaked refrigerant stops in the second chamber 2B and does not leak from the second chamber 2B to the first chamber 2A. Therefore, it is possible to reliably prevent the leaked refrigerant from leaking to the first chamber 2A side and to be diffused to the indoor side together with the conditioned air, so that even when the flammable refrigerant leaks, the operational safety of the air conditioner can be improved. Nature is ensured.

(B) According to the air conditioner using a flammable refrigerant according to the second invention of the present application, the heat exchanger 5 is provided on the wall surface of the partition wall 7 on the side of the second chamber 2B. Are closely adhered to each other, so that the conduction and heat transfer between the air in the first chamber 2A and the refrigerant flowing through the heat transfer tube 6 opposed to each other with the partition wall 7 therebetween is promoted. ,
The heat insulating material 9 suppresses heat radiation from the heat transfer tube 6 side that does not contribute to heat exchange with the air as much as possible, thereby ensuring high heat exchange capability.

(C) According to the air conditioner using a flammable refrigerant according to the third aspect of the present invention, the plurality of straight tubular heat transfer tubes 6 extending substantially horizontally along the wall surface of the partition wall 7. ,
Are arranged at predetermined intervals in the up-down direction and the end portions of the heat transfer tubes 6, 6,. 5 is set in a direction from the downstream side to the upstream side of the air flow on the first chamber 2A side, so that the temperature gradient in the heat exchanger 5 and the air in the first chamber 2A And the temperature gradient of
The heat exchange action between these two is promoted, and a high heat exchange capacity is secured.

(D) According to the air conditioner using a flammable refrigerant according to the fourth invention of the present application, each of the heat transfer tubes 6, 6,
.. Are made to be continuous via the conduit plates 15 and 16 which are abutted and fixed to the partition wall 7, so that, for example, the ends are individually continuous using respective pipes. As compared with the case described above, the compactness of the end portion is promoted, so that the arrangement space of the heat exchanger 5 can be narrowed and the air conditioner can be further compacted.

(E) According to the air conditioner using a flammable refrigerant according to the fifth aspect of the present invention, the fins 8 and 17 are provided on the wall surface of the partition wall 7 on the first chamber 2A side. ,
The heat transfer action is promoted by the fins 8 and 17, and higher heat exchange performance can be expected, for example, than when the fins 8 and 17 are not provided.

(F) According to the air conditioner using a flammable refrigerant according to the sixth aspect of the present invention, since the partition wall 7 is formed in a corrugated plate shape, it flows along the partition wall 7. The partition wall 7 functions as a kind of waffle fin with respect to air, and achieves the same high heat exchange performance as that provided with a fin despite having a configuration without a dedicated fin. The simplification of the structure of the air conditioner can be achieved as much as the air conditioner is not provided.

(G) According to the air conditioner using a flammable refrigerant according to the seventh aspect of the present invention, since the second chamber 2B is provided with the exhaust port 10 communicating with the outdoors, Even if the refrigerant leaks in the heat exchanger 5, the leaked refrigerant is quickly passed through the exhaust port 10 to the second chamber 2 </ b> B
The refrigerant is discharged from the side to the outside, and the leakage of the leaked refrigerant to the first chamber 2A side is reliably prevented. As a result, higher safety against the refrigerant leak is ensured.

(H) According to the air conditioner using a flammable refrigerant according to the eighth invention of the present application, the heat exchangers 22 of the indoor units Z ₂ and Z ₃ are arranged to cross the air flow path. That is, when the refrigerant leaks from the heat exchanger 5, in a configuration in which the leaked refrigerant is easily diffused indoors together with the conditioned air,
The heat transfer tubes 24, 24,... Which are arranged outside the tube sheet 23 and located at the outside end of the heat exchanger 22 and which have the highest possibility of refrigerant leakage are arranged outside the tube sheet 23. Since the closed box 30 that hermetically surrounds the joints 26 and 27 is provided, even if the refrigerant leaks from the welds 26 and 27, the leaked refrigerant is retained in the closed box 30. This is reliably prevented from being diffused to the indoor side together with the conditioned air, and accordingly, high safety against refrigerant leakage is ensured.

(I) According to the air conditioner using a flammable refrigerant according to the ninth aspect of the present invention, the heat transfer tube 24 is formed by bending a long tube in multiple layers. For example, as compared with the case where the heat transfer tube 24 is constituted by a plurality of U-shaped tubes and a plurality of arc tubes, the number of joints in the heat transfer tube 24 is greatly reduced, and a small number of joints are formed in the closed box. Since it is arranged in the inside 30, higher safety against refrigerant leakage is ensured.

(V) According to the air conditioner using a flammable refrigerant according to the tenth aspect of the present invention, since the closed box 30 is provided with the exhaust port 33 communicating with the outside, the heat Even if the refrigerant leaks in the exchanger 5, the leaked refrigerant is quickly passed through the exhaust port 33 to the closed box 3.
The refrigerant is discharged from the inside to the outside, and the leakage of the leaked refrigerant to the indoor side is surely prevented. As a result, higher safety against refrigerant leakage is ensured.

According to the air conditioner using a flammable refrigerant according to the eleventh aspect of the present invention, since the refrigerant leak detecting means 32 for detecting the refrigerant leaking into the closed box 30 is provided, the refrigerant If leakage occurs, this can be detected earlier and appropriate countermeasures can be taken, for example, measures such as shutting down the operation of the air conditioner, ensuring high safety in operation. .

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air conditioner according to the present invention will be specifically described based on some preferred embodiments.

[0030] The first embodiment Figure 1 shows an indoor unit Z ₁ of a separate type air conditioner as a first embodiment of an air conditioner according to the present invention. The indoor unit Z ₁ is are those composed by arranging a heat exchanger 5 and the fan 13 to be described later in the casing 1, is to use propane, a flammable refrigerant such as butane as refrigerants As described above, the casing 1 and the heat exchanger 5 adopt a unique configuration by applying the present invention. It will be specifically described the structure of the indoor unit Z ₁ in consideration of such specific configuration.

A: Description of the Structure The casing 1 has a substantially rectangular external form and is fixedly arranged on the wall W of the building. Are provided with air outlets 4 respectively. Further, the inner chamber 2 of the casing 1 is positioned on the front surface 1a side of the casing 1 by a partition wall 7 attached vertically in the inner chamber 2 to the suction port 3 and the outlet 4. It is divided into a front and rear two chambers of a first chamber 2A facing the first chamber 2A and a second chamber 2B located on the back surface 1b side of the casing 1 and airtightly isolated from the first chamber 2A. Also,
At the lower end of the second chamber 2B, an exhaust port 10 for communicating the second chamber 2B outdoors is provided so as to penetrate the wall W.

In the two chambers 2A and 2B, the fan 13 is disposed below the first chamber 2A and in the vicinity of the outlet 4. The second chamber 2B has the following heat exchange. The vessel 5 is arranged.

The heat exchanger 5 has a meandering shape in which straight heat transfer tubes 6, 6,... Having a predetermined length are arranged in parallel at a predetermined interval, and both ends of the adjacent heat transfer tubes 6, 6 are sequentially connected. Each of these heat transfer tubes 6, 6,... Is tightly fixed to the back surface 7b of the partition wall 7 to be incorporated in the casing 1. The heat exchanger 5 has a refrigerant outgoing pipe 11 connected to the lowermost heat transfer pipe 6 and a refrigerant return pipe 12 connected to the uppermost heat transfer pipe 6, and the flammable refrigerant is connected to the heat exchanger 5. 5 is circulated from the lower end to the upper end. The refrigerant outgoing pipe 11 and the refrigerant return pipe 12 are drawn out through the exhaust port 10 and connected to an outdoor unit (not shown).

Further, a heat insulating material 9 is disposed on a rear side portion of the heat exchanger 5 (ie, a portion located on the opposite side of the partition wall 7 with the heat exchanger 5 interposed therebetween). Each of the heat transfer tubes 6, 6,... Of the heat exchanger 5 is sandwiched between the partition wall 7 and the heat insulating material 9 from both sides thereof.
In addition, on the front surface 7a of the partition wall 7, the heat transfer tubes 6,
A large number of needle fins 8, corresponding to 6,
8, ... are fixed.

B: Description of Operation In the indoor unit Z _{1 having} such a configuration, when the fan 13 is operated, the room air flows from the suction port 3 to the inner chamber 2 as shown by a stream line A ₁ in FIG. Is sucked into the inner chamber 2
The flows down from top to bottom, is blown into the room as shown by the streamlines A ₂ from the outlet 4. On the other hand, in the heat exchanger 5, the refrigerant flows from the lower end side to the upper end side of the heat exchanger 5 so as to face the flow direction of the air in the first chamber 2A. .. Between the refrigerant circulating in the heat transfer tubes 6, 6,... Of the heat exchanger 5 and the air on the first chamber 2 </ b> A side by the conductive heat transfer action via the partition wall 7. The replacement is performed, and the heating action or the cooling action is realized.

By the way, since the refrigerant has flammability, in order to ensure the safe operation of the air conditioner, even if the refrigerant leaks, the leaked refrigerant is prevented from being diffused to the indoor side by the conditioned air. This is necessary as described above.

In this case, in the indoor unit Z ₁ of this embodiment, as described above, the inner chamber 2 of the casing 1 is air-tightly divided into the first chamber 2 A and the second chamber 2 B by the partition wall 7, And the second chamber 2 not facing the inlet 3 and the outlet 4
Since the heat exchanger 5 is disposed on the B side, even if the refrigerant leaks from the heat exchanger 5 in the second chamber 2B, the leaked refrigerant does not leak to the first chamber 2A side. Then, the refrigerant is smoothly discharged from the second chamber 2B to the outside through the exhaust port 10 as it is, so that the leakage of the leaked refrigerant to the room is reliably prevented, and high safety in operation of the air conditioner is secured. Things.

In the heat exchanger 5 having a structure in which heat is exchanged by conduction heat transfer through the partition wall 7, for example, a so-called cross-flow type heat is generated in which air flows across the heat exchanger 5. The heat exchange capacity tends to be lower than in the case of the exchanger. However, in this embodiment, as described above, the flow direction of the air and the refrigerant flowing on both sides of the partition wall 7 is opposed to each other so that the temperature gradients of the two correspond to each other to promote heat transfer. ,
A heat insulating material 9 is arranged on the back side of each of the heat transfer tubes 6, 6,... To suppress heat radiation from each of the heat transfer tubes 6, 6,. , 8,... Are provided to promote heat transfer, and as a synergistic effect of them, a decrease in the heat exchange capacity due to the heat transfer structure is reduced as much as possible.

C: Others C-1: Another structural example of the heat exchanger 5 As described above, the heat exchanger 5 has a rear surface 7 of the partition wall 7.
Since the heat transfer tubes 6, 6,... are arranged in close contact with b, one-pass single-row arrangement is basically used, but two-pass single-row arrangement is also possible. However, in this case, it is necessary to save space at the connection portions of the ends of the heat transfer tubes 6, 6,... And also to ensure the degree of adhesion of the heat transfer tubes 6, 6,. is there. As one piping structure that satisfies such demands, the one shown in FIG. 2 is proposed. That is, the partition wall 7 is used as it is as one of the end holding members of the heat transfer tube 6, and the partition wall 7 is used.
The first conduit plate 15 and the second conduit plate 16 are fixedly arranged, and the conduits 15a, 16a are bulged at required positions of the respective conduit plates 15, 16 by roll bonding. Pipes 15 of channel plates 15, 16
The end portions of the heat transfer tubes 6, 6,... and the refrigerant outgoing tubes 11, 11 and the refrigerant return tubes 12, 12 are fitted and connected to the a, 16a.

With this structure, each of the heat transfer tubes 6,
.. Can be surely brought into close contact with the partition wall 7 to ensure good heat transfer performance.
It is possible to save the space by minimizing the height dimension of the end connection portions of 6,.

C-2: Another Example of Fin Structure FIG. 3 shows the needle-like fins 8, 8,.
Instead of the plate fins 17 and 1
7 are provided. In this case, the arrangement direction of the plate fins 17, 17,... Is set so as to extend in the vertical direction in consideration of the flow of air in the first chamber 2A. Such a plate fin 1
7, the needle-like fins 8,
The same operation and effect as those of 8,.

In the embodiment shown in FIG. 4, the partition wall 7 itself is formed in a corrugated shape without providing a separate fin, and the heat transfer tubes 6, 6,... It was done. In this case, in consideration of the flow direction of the air, the bending direction of the partition wall 7 is set to be a horizontal direction so that the air flow can contact each peak. According to such a structure, not only good heat transfer performance is ensured, but also since there is no need to provide a dedicated fin, simplification of the structure and space saving are promoted. It is.

[0043] Second Embodiment FIG. 5, a second embodiment of an air conditioner according to the present invention showing an indoor unit Z ₂ crossflow type. That is, the indoor unit Z ₂ is configured by housing the cross-flow type heat exchanger 5 and the fan 28 in the casing 21. In this type of heat exchanger 5, one of the tube sheets 23, 23 located at both ends thereof is used.
3 (in this embodiment, the right side tube sheet 23)
On each of the heat transfer tubes 24, 2 arranged through the fins,
Bent pipes 25, 25 that connect the ends of 4,.
Are provided, and a refrigerant outgoing pipe 35 and a refrigerant return pipe 36 are connected to the heat transfer pipes 24, 24 located at both ends in the refrigerant flow direction, respectively.

In this case, the bending pipes 25, 25,.
And each of the heat transfer tubes 24, 24,.
24, the bent pipe 25, and the refrigerant return pipe 36 are connected by welding. Therefore, the welded portions 27, 27,... Of the bent tubes 25, 25,.
And the welded portions 26, 2 of the refrigerant forward pipe 35 and the welded portion 26
6 will be present. Such a welded portion can serve as a leaking portion of the refrigerant, and the leaked refrigerant from the welded portion is, due to the structure of the heat exchanger 22, riding on the airflow circulating across the heat exchanger 22, and as it is in the chamber. Since the refrigerant is diffused inward, it is necessary to take a countermeasure in a case where the refrigerant leaks from each of these welds, that is, a countermeasure for preventing the leakage of the leaked refrigerant to the indoor side.

For this reason, in the indoor unit Z ₂ of this embodiment, the present invention is applied, the closed box 30 is attached to the tube sheet 23 side, and each of the welded portions is accommodated in the closed box 30. I have to. By adopting such a configuration,
Even if the refrigerant leaks at each of the welds, the leaked refrigerant stops in the closed box 30 and is reliably prevented from diffusing into the room.

In this case, when adopting a structure in which the leaked refrigerant is stored in the closed box 30, the capacity and strength of the closed box 30 are limited. It was placed, when the refrigerant leakage is detected by the coolant sensor 32, may be so as to immediately stop the operation of the indoor unit Z _2.

Further, as shown by a dashed line in the same figure, an exhaust port 33 is provided in the closed box 30 so that when the refrigerant leaks from the welded portion, the leaked refrigerant is discharged outside through the exhaust port 33. May be. In this case, the installation of the refrigerant sensor 32 is unnecessary.

Third Embodiment FIG. 6 shows an indoor unit Z according to a third embodiment of the present invention.
₃ is shown. The indoor unit Z _3, the second embodiment of the ones and which was provided with a cross flow type heat exchanger 22 as well, what differs from the above second embodiment, the heat transfer tube 24 Is formed by bending a single long tube in a meandering shape, and a refrigerant outgoing tube 35 and a refrigerant returning tube 3 are provided at both ends thereof.
6 is connected. With such a configuration, the two welded portions that can become the refrigerant leakage points in the heat exchanger 22 are the welded portions 26, 26 of the refrigerant outgoing pipe 35 and the refrigerant return pipe 36. The possibility of refrigerant leakage is greatly reduced as compared to the ones. Further, by housing the two welds 26, 26 in the closed box 30, it is possible to reliably prevent the leaked refrigerant from diffusing into the room. That is, the indoor unit Z ₃ of this embodiment
The present invention achieves both suppression of leakage of the refrigerant itself and prevention of diffusion of the leakage refrigerant to the indoor side.

Since the heat transfer tube 24 in the heat exchanger 22 of this embodiment requires flexibility, for example, as shown in FIG. 7, a large number of needle fins 37, 3 are provided on the tube surface.
, Or as shown in FIG. 8, a large number of small plate fins 38, 38,.

[Brief description of the drawings]

FIG. 1 is a sectional view of an outdoor unit in an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing another example of the structure of the heat exchanger applied to the indoor unit shown in FIG.

FIG. 3 is a perspective view showing another example of the structure of the heat exchanger applied to the indoor unit shown in FIG.

FIG. 4 is a perspective view showing another example of the structure of the heat exchanger applied to the indoor unit shown in FIG.

FIG. 5 is a perspective view of an outdoor unit in an air conditioner according to a second embodiment of the present invention.

FIG. 6 is a perspective view of an indoor unit in an air conditioner according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a perspective view showing another example of the structure of the heat transfer tube applied to the indoor unit shown in FIG.

[Explanation of symbols]

1 is a casing, 2 is an inner chamber, 2A is a first chamber, 2B is a second chamber, 3 is an inlet, 4 is an outlet, 5 is a heat exchanger, 6 is a heat transfer tube, 7 is a partition wall, and 8 is a needle. Fins, 9 is a heat insulating material, 10 is an exhaust port, 11 is a refrigerant outgoing pipe, 12 is a refrigerant return pipe, 13 is a fan, 15 is a first pipe plate, 16 is a second pipe plate, 17 is a plate fin, 21 is a casing, 22 is a heat exchanger, 23 is a tube plate, 24 is a heat transfer tube, 25 is a bent tube,
26 and 27 are welds, 28 is a fan, 30 is a closed box,
31 is an inner chamber, 32 is a refrigerant sensor, 33 is an exhaust port, 35
Is a refrigerant outgoing pipe, 36 is a refrigerant return pipe, 37 is a needle fin, 38
The plate fin, Z ₁ to Z ₃ is the indoor unit.

Claims (11)

[Claims] An air conditioner using a flammable refrigerant as a refrigerant, the casing (1) of an indoor unit (Z ₁ ) disposed indoors
Of the first chamber (2A) facing the inlet (3) and the outlet (4) by the partition wall (7) arranged in the casing (1) and the first chamber (2A). ) And a second chamber (2B) which is airtightly isolated from the first chamber (2B), and a heat exchanger (5) is arranged on the second chamber (2B) side to conduct the heat through the partition wall (7). The heat transfer function allows heat exchange between the air circulating in the first chamber (2A) and the refrigerant circulating in the heat exchanger (5) in the second chamber (2B). An air conditioner using a flammable refrigerant. 2. The heat exchanger (5) according to claim 1, wherein the heat exchanger (5) is configured by closely adhering a heat transfer tube (6) to a wall surface of the partition wall (7) on the side of the second chamber (2B). An air conditioner using a flammable refrigerant, characterized in that a heat insulating material (9) is provided at a position opposite to the partition wall (7) with the heat transfer tube (6) interposed therebetween. 3. The heat exchanger (5) according to claim 2, wherein the heat exchanger (5) includes a plurality of straight tubular heat transfer tubes (6) extending substantially horizontally along a wall surface of the partition wall (7).
(6),... Are arranged at predetermined intervals in the vertical direction, and the end portions of the heat transfer tubes (6), (6),. The refrigerant flow in the exchanger (5) is set in a direction from the downstream side to the upstream side of the air flow in the first chamber (2A) side, wherein the air using the flammable refrigerant is set. Harmony machine. 4. The heat transfer tube according to claim 3, wherein an end of each of the heat transfer tubes (6), (6),... Is fixedly abutted to the partition wall (7) and is in contact with the partition wall (7). An air conditioner using a flammable refrigerant, characterized in that the air conditioner is continuous through conduit plates (15) and (16) having conduits (15a) and (16a) formed in the abutting portion. 5. The fin (8, 17) according to claim 1, 2 or 3, wherein a fin (8, 17) is provided on a wall surface of the partition wall (7) on the first chamber (2A) side. Air conditioner using flammable refrigerant. 6. The air conditioner according to claim 1, wherein the partition wall (7) is formed in a corrugated plate shape. 7. The flammable refrigerant according to claim 1, wherein the second chamber (2B) is provided with an exhaust port (10) communicating with the outside. Air conditioner using. 8. An air conditioner using a flammable refrigerant as a refrigerant, wherein heat exchangers (22) of indoor units (Z ₂ ) and (Z ₃ ) arranged on the indoor side intersect with the air flow path. The heat exchanger tubes (24), (24),... Joints (26), outside the tube sheet (23) arranged at the width direction end of the heat exchanger (22). An air conditioner using a flammable refrigerant, comprising a closed box (30) that hermetically surrounds (27). 9. The air conditioner using a flammable refrigerant according to claim 8, wherein the heat transfer tube (24) is formed by bending a long tube in multiple layers. 10. An air conditioner using a flammable refrigerant according to claim 8, wherein the closed box (30) is provided with an exhaust port (10) communicating with the outside. 11. The method according to claim 8, 9 or 10, wherein the closed box (30) is provided with a refrigerant leak detecting means (32) for detecting a refrigerant leaking into the closed box (30). An air conditioner that uses a flammable refrigerant.