JP2011032917A - Exhaust gas heat exchange device and air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas heat exchange device and an air conditioning device, inhibiting enlargement in size of an exhaust gas heat exchange device body. <P>SOLUTION: The exhaust gas heat exchange device 70 includes a catalyst 80 at one end of the exhaust gas heat exchange device body 71 for cleaning emissions in exhaust gas of an engine and a heat exchanger 77 at the other end of the exhaust gas heat exchange device body for exchanging heat between the cleaned exhaust gas and engine cooling water. In the exhaust gas heat exchange device, the catalyst 80 is arranged at the back in one end portion of the exhaust gas heat exchange device body 71 with a space S left and an exhaust gas inlet 74a is provided for introducing the exhaust gas toward the outer peripheral surface 80a of the catalyst 80. The exhaust gas from the exhaust gas inlet 74a flows around the outer peripheral surface 80a of the catalyst 80 into the back space S and is supplied to the heat exchanger 77 through the catalyst 80. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an exhaust gas heat exchange device including an exhaust gas heat exchanger body that purifies exhaust gas of an engine that drives a compressor with a catalyst, and an air conditioner.

Conventionally, a compressor that constitutes a refrigerant circuit, an engine that drives the compressor, and an exhaust gas of the engine is circulated through a catalyst provided therein to purify the exhaust gas and a cooling water that cools the engine. An air conditioner including an exhaust gas heat exchanger that performs heat exchange is known. In this type, the exhaust gas heat exchanger has a substantially cylindrical body, an exhaust gas introduction pipe for introducing exhaust gas from the engine is connected to one end surface of the body, and a substantially cylindrical body is connected to one end of the body. (See, for example, Patent Document 1).
JP 11-294893 A

By the way, it is desirable that the exhaust gas introduction pipe is not exposed because it is heated by the high temperature exhaust gas flowing inside. When the exhaust gas heat exchanger is arranged so that the cylinder part of the trunk part is close to the engine, the exhaust gas introduction pipe is connected to the cylinder part on the engine side of the trunk part instead of one end surface of the trunk part. It is conceivable to suppress the exposure.
However, in order to distribute the exhaust gas to the catalyst, it is necessary to connect the exhaust gas introduction pipe to the trunk portion on the upstream side of the catalyst, and the trunk portion is enlarged in the length direction only by the connection portion of the exhaust gas introduction pipe. .
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an exhaust gas heat exchange device and an air conditioner in which an increase in the size of an exhaust gas heat exchanger body is suppressed.

In order to solve the above problems, the present invention includes a catalyst for purifying engine exhaust gas at one end of an exhaust gas heat exchanger body, and the purified exhaust gas and engine cooling water at the other end of the exhaust gas heat exchanger body. In the exhaust gas heat exchanger having a heat exchanger for exchanging heat between them, the catalyst is arranged with a gap at the back of one end of the exhaust gas heat exchanger body, and the exhaust gas is directed toward the outer peripheral surface of the catalyst. An exhaust gas inlet to be introduced is provided, and the exhaust gas from the exhaust gas inlet is circulated from the outer peripheral surface of the catalyst into the back gap, and is supplied to the heat exchanger through the catalyst.
In this case, the catalyst is fixed with two substantially annular fixed wheels, and exhaust gas flowing from the exhaust gas inlet and flowing along the outer peripheral surface of the catalyst into the back fixed wheel is passed through the back clearance into the back clearance. A circulation hole for circulation may be provided.

  According to the above configuration, the catalyst is arranged with a gap in the back of one end of the exhaust gas heat exchanger body, the exhaust gas inlet for introducing the exhaust gas toward the outer peripheral surface of the catalyst is provided, and the exhaust gas from the exhaust gas inlet is Since the exhaust gas inlet can be formed to face the catalyst in order to pass through the catalyst from the outer peripheral surface of the gas and feed the catalyst to the heat exchanger, it is necessary to provide the exhaust gas inlet on the upstream side of the catalyst. The increase in size in the vertical direction can be suppressed.

The exhaust gas heat exchanger main body may be configured by a body portion and a cap body, and the catalyst may be disposed on the cap body.
According to the said structure, since a catalyst is arrange | positioned at a cap body, a cap body can be removed and a catalyst can be cleaned, and maintainability improves.
The inner fixed ring may be formed in a substantially C shape by cutting out a portion facing the exhaust gas inlet.
According to the above configuration, the rear fixed ring is formed in a substantially C shape by cutting out the portion facing the exhaust gas inlet, so that the exhaust gas easily flows to the rear side of the catalyst and the rear fixed ring. Can reduce material.
The fixed ring may have a shape with a curved cross section, and the curved portion of the cross section may absorb expansion and contraction of thermal expansion.
According to the above configuration, the fixed ring has a substantially U shape with a curved cross section, and the expansion and contraction of the thermal expansion can be absorbed by the curved portion of the cross section. Therefore, the fixed ring is heated by the high temperature exhaust gas circulating in the exhaust gas heat exchanger body. It becomes possible to absorb and fix the strain of the expanded catalyst.

In this case, the compressor constituting the refrigerant circuit, the engine driving the compressor, the catalyst for purifying the exhaust gas of the engine, and the heat exchanger for exchanging heat between the purified exhaust gas and the engine cooling water The exhaust gas heat exchanger main body provided with the exhaust gas heat exchanger main body, in the air conditioning apparatus, the catalyst is disposed with a gap at the back of one end of the exhaust gas heat exchanger main body, and toward the outer peripheral surface of the catalyst An exhaust gas inlet for introducing the exhaust gas may be provided, and the exhaust gas from the exhaust gas inlet may be passed from the outer peripheral surface of the catalyst to the inner clearance to pass through the catalyst and be supplied to the heat exchanger.
According to the above configuration, since the exhaust gas inlet can be formed to face the catalyst, it is necessary to provide the exhaust gas inlet on the upstream side of the catalyst.

  According to the present invention, a catalyst is disposed with a gap in the back of one end of the exhaust gas heat exchanger main body, an exhaust gas inlet for introducing exhaust gas toward the outer peripheral surface of the catalyst is provided, and the exhaust gas from the exhaust gas inlet is Since the exhaust gas inlet can be formed to face the catalyst in order to pass through the catalyst from the outer peripheral surface of the gas and feed the catalyst to the heat exchanger, it is necessary to provide the exhaust gas inlet on the upstream side of the catalyst. The increase in size in the vertical direction can be suppressed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a circuit diagram showing a gas engine driven air conditioner according to an embodiment of the present invention.
The air conditioner 1 includes an outdoor unit 2 and a plurality of indoor units 3a to 3c, which are connected by an inter-unit pipe 4 including a liquid pipe 4a and a gas pipe 4b. The outdoor unit 2 houses a gas engine (engine) 10 and a compressor 12 that compresses the refrigerant by the driving force of the gas engine 10. The gas engine 10 generates a driving force by burning a mixture of fuel gas or other fuel supplied through the fuel adjustment valve 7 and air supplied through the throttle valve 8. The outdoor unit 2 is provided with an outdoor controller 39, and the outdoor controller 39 is connected to the indoor controllers of the indoor units 3a to 3c via the communication line 42 so as to communicate with each other.

The compressor 12 includes compressors 12a and 12b having large and small capacities, and these two compressors 12a and 12b are connected to a drive shaft 10a (see FIG. 3) of the gas engine 10 via a transmission belt 60 (see FIG. 2). Reference). Electromagnetic clutches 14a and 14b are respectively provided between the drive shaft 10a of the gas engine 10 and the compressors 12a and 12b, and the drive shaft 10a and the compressors 12a and 12b can be contacted and separated by the electromagnetic clutches 14a and 14b. It is.
The discharge pipes 12c of the compressors 12a and 12b are connected in the order of the plate heat exchanger 31, the four-way valve 15, and the outdoor heat exchanger 17, and each outdoor unit is connected to the outdoor heat exchanger 17 via the liquid pipe 4a. Expansion valves 19a to 19c of 3a to 3c and indoor heat exchangers 21a to 21c are connected. A four-way valve 15 is connected to the indoor heat exchangers 21a to 21c via a gas pipe 4b. Are connected to the compressors 12a and 12b via the suction pipe 12d. Further, the discharge pipe 12c and the suction pipe 12d of the compressors 12a and 12b are connected by a bypass pipe 18, and a bypass valve 20 for unloading is provided in the bypass pipe 18. In this configuration, a refrigerant circuit is formed by the above-described devices.

  The refrigerant circuit can be switched between the heating operation and the cooling operation by the four-way valve 15. When the switching state of the four-way valve 15 is heating switching, when the compressors 12a and 12b are driven by the gas engine 10, the compressors 12a and 12b, the four-way valve 15, and the indoor heat exchanger 21a are indicated by solid arrows. To 21c, the expansion valves 19a to 19c, and the outdoor heat exchanger 17, the refrigerant circulates in order, and the room is heated by the refrigerant condensation heat in the indoor heat exchangers 21a to 21c. On the contrary, if the four-way valve 15 is switched to cooling, the compressors 12a and 12b, the four-way valve 15, the outdoor heat exchanger 17, the expansion valves 19a to 19c, and the indoor heat exchanger are indicated by the broken arrows. The refrigerant circulates in the order of 21a to 21c, and the room is cooled by the refrigerant evaporation heat in the indoor heat exchangers 21a to 21c. In addition, the code | symbol 48a-48c is an air blower which ventilates to each indoor heat exchanger 21a-21c.

  The gas engine 10 is a water-cooled type, and the cooling water circulated through the water jacket of the gas engine 10 is supplied to the radiator 25 through the first three-way valve 22, the reverse power flow heater 23, and the second three-way valve 24. . The radiator 25 is arranged side by side with the outdoor heat exchanger 17, and these are air-cooled by air sent by the same blower 26. The cooling water that has passed through the radiator 25 flows in the order of the cooling water pump 27 and the exhaust gas heat exchange device 70 and is returned to the water jacket of the gas engine 10. Exhaust gas from the gas engine 10 is passed through the exhaust gas heat exchange device 70, and the exhaust gas is discharged out of the outdoor unit 2 through the exhaust top 30.

The first three-way valve 22 described above is automatically switched according to the temperature of the cooling water. That is, when the cooling water temperature is lower than the predetermined temperature, the cooling water from the water jacket of the gas engine 10 bypasses the radiator 25 and is directly led to the cooling water pump 27 and the exhaust gas heat exchange device 70 in this order, Return to the jacket.
The second three-way valve 24 is switched, for example, at the time of heating operation. In this case, the cooling water bypasses the radiator 25, passes through the plate heat exchanger 31, and flows in the order of the cooling water pump 27 and the exhaust gas heat exchange device 70. Returned to the water jacket.

Next, the configuration of the outdoor unit 2 will be described.
FIG. 2 is a rear view of the outdoor unit 2. In FIG. 2, the description of the panel covering the outside of the casing of the outdoor unit 2 is omitted.
As shown in FIG. 2, the outdoor unit 2 includes a casing 52 formed in a substantially rectangular parallelepiped shape, and the inside of the casing 52 is defined in two upper and lower stages by a partition plate 53 extending substantially horizontally. . A heat exchange chamber 54 in which the outdoor heat exchanger 17 (see FIG. 1) and the blower 26 are provided is configured in the upper stage, and a machine room 55 in which the gas engine 10 and the compressor 12 are disposed in the lower stage. Is configured.
The partition plate 53 partitions both chambers without any gap so that rainwater or the like entering the heat exchange chamber 54 through the gaps between the fins of the blower 26 and the outdoor heat exchanger 17 does not enter the machine chamber 55. In the partition plate 53, two vent holes 56 that connect the heat exchange chamber 54 and the machine chamber 55 are provided at intervals in the width direction of the outdoor unit 2. Each vent 56 communicates with both chambers so that the air inside the outdoor unit 2 can freely move between the two chambers. Each vent 56 is provided with a roof portion 56a so that rainwater or the like does not enter the machine room 55 from the heat exchange chamber 54 side, and the air on the machine room 55 side is indicated by an arrow X shown in FIG. To the heat exchange chamber 54.

  Two blowers 26 are arranged in the width direction on the top surface 52a of the casing 52 of the outdoor unit 2. The blower 26 takes the outside air into the heat exchange chamber 54 through the gaps between the fins of the outdoor heat exchangers arranged on the front side and the back side of the heat exchange chamber 54 respectively. Heat exchange is performed with the refrigerant flowing through the refrigerant 17 (see FIG. 1). Then, the heat-exchanged air is exhausted upward of the outdoor unit 2 by the blower 26. Further, an exhaust top 30 for discharging exhaust gas from the gas engine 10 to the outside of the outdoor unit 2 is provided on the top surface 52a of the casing 52.

  Although not shown, a front panel, a back panel, and a side panel are disposed on the front, back, and side surfaces of the machine room 55, respectively. In this configuration, each of the front panel and the rear panel is composed of a pair of left and right panels, and a vertical frame 57 that supports the panels is provided between the two panels. The front panel, the back panel, and the side panel are detachably attached (openable and closable) to each frame of the casing 52 with screws or the like. When these panels are attached, the outdoor unit 2 has a watertight structure in which rainwater or the like does not enter the machine room 55.

FIG. 3 is a cross-sectional view of the machine room 55 as viewed from above. Note that the upper side in FIG. 3 corresponds to the back side, and the lower side corresponds to the front side.
Inside the machine chamber 55, the gas engine 10 is disposed at a substantially central portion of the bottom plate 55 a, and two compressors 12 are disposed side by side on the front left side (hereinafter simply referred to as the left side) of the gas engine 10. An outdoor controller 39 is disposed on the front side of the compressor 12 and on the left side of the vertical frame 57 described above. The outdoor controller 39 controls the operation of each device (for example, the gas engine 10, the electromagnetic clutches 14a and 14b, the four-way valve 15, and the blower 26) disposed in the outdoor unit 2.

As shown in FIG. 3, the gas engine 10 has a drive shaft 10 a serving as an output shaft, and the drive shaft 10 a protrudes substantially horizontally from both ends of the gas engine 10. A drive pulley 58 for winding transmission is attached to a shaft end portion on the left side (one end side) of the drive shaft 10a. A drive pulley 59 is also attached to the driven shaft of the compressor 12, and a transmission belt 60 is wound around these drive pulleys 58 and 59. Thereby, the rotational power of the gas engine 10 is transmitted to the compressor 12 via the transmission belt 60, and the compressor 12 is driven.
In FIG. 3, reference numeral 61 denotes an accumulator, 62 denotes an oil separator, 63 denotes an air cleaner, 64 denotes an intake box, 65 denotes an exhaust muffler, and 66 denotes an oil sub tank.

Next, the exhaust gas heat exchange device 70 will be described.
FIG. 4 is a right side view showing the gas engine 10. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and is a cross-sectional view showing the exhaust gas heat exchange device 70. FIG. 6 is a perspective view showing the catalyst 80 of the exhaust gas heat exchange device 70.
As shown in FIG. 4, the exhaust gas heat exchanger 70 includes a substantially cylindrical exhaust gas heat exchanger main body 71 extending in the front-rear direction. The exhaust gas heat exchanger main body 71 is rearwardly lowered on the upper right side of the gas engine 10. Inclined and fixed.
As shown in FIG. 5, the exhaust gas heat exchanger main body 71 includes a substantially cylindrical body 72, a bottomed cylindrical outer cap 73 attached to one end of the body 72, and an inner side of the outer cap 73. A bottomed cylindrical inner cap (cap body) 74 provided and a bottomed cylindrical downstream cap 75 attached to the other end side of the body portion 72 are provided.

A plurality of pipes 76 extending in the length direction of the trunk portion 72 are arranged in the trunk portion 72 with a predetermined gap therebetween. The pipe 76 passes through both end faces 72a and 72b of the body 72 and is attached to the both end faces 72a and 72b.
A cooling introduction pipe 28a that guides cooling water from the gas engine 10 into the barrel portion 72 is connected to the cylindrical portion 72c opposite to the gas engine 10 on the other end surface 72b side of the barrel portion 72. In the cylindrical portion 72c on the side, a plurality of discharge holes 72d for discharging the cooling water flowing into the body portion 72 are formed at substantially equal intervals in the circumferential direction. A cooling water discharge pipe 28 b for discharging cooling water is connected to the bottom of the outer cap 73.

A through hole 73a is formed in the cylindrical portion of the outer cap 73 on the gas engine 10 side, and an exhaust gas introduction pipe 29a that guides the exhaust gas of the gas engine 10 is inserted into the through hole 73a. The exhaust gas introduction pipe 29 a is connected to an exhaust gas inlet 74 a formed in the cylindrical portion of the inner cap 74 on the gas engine side 10. Connected to the bottom of the downstream cap 75 is an exhaust gas discharge pipe 29 b that flows into the inner cap 74 from the exhaust gas inlet 74 a and discharges the exhaust gas that has circulated through the pipe 76.
In this way, the exhaust gas heat exchange device 70 includes an inner trunk (inner cap 74, pipe 76, downstream cap 75) through which exhaust gas flows and cooling water as indicated by a dotted arrow in the figure, as indicated by a solid arrow in the figure. Are formed in a double structure including an outer body (body part 72, outer cap 73) through which the gas flows, and the body part 72 and the pipe 76 constitute a heat exchanger 77 for exchanging heat between the exhaust gas and the cooling water. ing.

In the inner cap 74, a substantially cylindrical catalyst 80 for purifying exhaust gas is disposed with a gap S on the back side (in the present embodiment, one end side). As shown in FIG. 6, the catalyst 80 is configured such that a noble metal such as platinum is supported on a honeycomb structure having a plurality of communication holes. The catalyst 80 is disposed such that its outer peripheral surface 80a faces the exhaust gas inlet 74a, and both ends of the outer peripheral surface 80a are fixed in the inner cap 74 by substantially annular fixed rings 81 and 82. The fixed rings 81 and 82 are each formed in a U-shaped cross section, and the fixed ring 81 on the one end face 80b side of the catalyst 80 is attached with the U-shaped open part facing one end side, and the fixed ring on the other end face 80c side. 82 is attached with the U-shaped open part facing the other end. The fixed ring 81 on one end side is formed with a notch 81a formed by notching a portion facing the exhaust gas inlet 74a, and the fixed ring 81 is substantially C-shaped when viewed from one end side. Further, the fixed ring 81 has a plurality of flow holes 81b arranged substantially evenly in the circumferential direction.
As shown in FIG. 5, the diameter of the exhaust gas inlet 74 a is formed to be substantially the same as the length from the one end surface 80 b of the catalyst 80 to the bottom 82 a of the fixed ring 82.

  As shown in FIGS. 5 and 6, the exhaust gas that has flowed into the inner cap 74 from the exhaust gas inlet 74 a collides with the outer peripheral surface 80 a of the catalyst 80, and a part of the catalyst 80 is notched from the notch 81 a of the fixed ring 81. It flows into the deep gap S on the end face 80b side, and the remainder branches in the circumferential direction and flows along the outer peripheral face 80a. At this time, since the fixed ring 82 is disposed on the other end surface 80c side of the catalyst 80, the exhaust gas does not flow into the other end surface 80c side. The exhaust gas that has flowed along the outer peripheral surface 80a wraps around the gap S in the back on the one end surface 80b side of the catalyst 80 from the plurality of flow holes 81b. The exhaust gas that has flowed into the back gap S flows into the catalyst 80 from the one end face 80b, where it is purified by platinum or the like and discharged from the other end face 80c.

  Here, since the temperature of the exhaust gas burned and discharged by the gas engine 10 becomes high (for example, about 600 ° C.), when the exhaust gas passes through the catalyst 80, the catalyst 80 expands in the normal direction. Since the temperature of the cooling water flowing between the outer cap 73 and the inner cap 74 is relatively low (for example, about 80 ° C.) with respect to the exhaust gas temperature, the inner cap to which the expanding catalyst 80 is fixed. 74 does not swell so much. The fixed rings 81 and 82 for fixing the catalyst 80 have a substantially U-shaped cross section. Therefore, the curved portion is made elastic to absorb the expansion and contraction in the normal direction of the catalyst 80, and the inner cap The expansion strain of the catalyst 80 due to the temperature difference from 74 is absorbed, so that the inner cap 74 can be fixed.

Further, by forming the cutout portion 81a and the flow hole 81b in the fixed ring 81 on one end side, the exhaust gas inlet 74a can be provided to face the outer peripheral surface 80a of the catalyst 80. The length of the exhaust gas heat exchanger main body 71 can be shortened compared with the case where it provides upstream. Further, by forming the notch 81a and the flow hole 81b in the fixed ring 81, the material of the fixed ring 81 can be reduced. Further, since the catalyst 80 is disposed on the inner cap 74, the inner cap 74 can be removed to clean the catalyst 80, and the maintainability is improved.
Then, the exhaust gas flows into the heat exchanger 77 from the one end surface 72a of the trunk portion 72, is recovered by heat by the cooling water flowing between the pipes 76, and is discharged from the exhaust gas discharge pipe 29b with the exhaust gas temperature lowered.

  As described above, according to the present embodiment, the catalyst 80 is arranged with a gap S at the back of one end of the exhaust gas heat exchanger main body 71, and the exhaust gas is introduced toward the outer peripheral surface 80 a of the catalyst 80. The exhaust gas inlet 74a is provided, and the exhaust gas from the exhaust gas inlet 74a is circulated from the outer peripheral surface 80a of the catalyst 80 to the back clearance S, and is supplied to the heat exchanger 77 through the catalyst 80. Therefore, it is necessary to provide the exhaust gas inlet 74a on the upstream side of the catalyst 80, and the exhaust gas heat exchange device 70 can be prevented from being enlarged in the length direction.

Further, according to the present embodiment, since the catalyst 80 is disposed on the inner cap 74, the inner cap 74 can be removed to clean the catalyst 80, and the maintainability is improved.
Further, according to the present embodiment, the fixed ring 81 on one end side is formed in a substantially C shape by cutting out a portion facing the exhaust gas inlet 74 a, so that the exhaust gas easily flows to one end side of the catalyst 80. At the same time, the material of the fixed ring 81 on the one end side can be reduced.
Furthermore, according to the present embodiment, the fixed ring 81 has a substantially U shape with a curved cross section, and the expansion and contraction of the thermal expansion can be absorbed by the curved portion of the cross section. It becomes possible to absorb and fix the strain of the catalyst 80 expanded by the high temperature exhaust gas.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the notch 81 a is provided in the fixed ring 81 on one end side, but a plurality of notches 81 a are provided in the fixed ring 81 over the entire circumferential direction of the fixed ring 81. You may make it form the flow hole 81b.

It is a circuit diagram which shows the air conditioning apparatus which concerns on embodiment of this invention. It is a rear view of an outdoor unit. It is sectional drawing which looked at the machine room from the upper side. It is a right view which shows a gas engine. It is VV sectional drawing of FIG. It is a perspective view which shows the catalyst of an exhaust gas heat exchange apparatus.

1 Air Conditioner 10 Gas Engine (Engine)
12 Compressor 70 Exhaust Gas Heat Exchanger 71 Exhaust Gas Heat Exchanger Main Body 72 Body 74 Inner Cap (Cap Body)
74a Exhaust gas inlet 77 Heat exchanger 80 Catalyst 80a Outer peripheral surface 81, 82 Fixed ring 81b Flow hole S Clearance

Claims (6)

A catalyst for purifying engine exhaust gas is provided at one end of the exhaust gas heat exchanger body, and a heat exchanger for exchanging heat between the purified exhaust gas and engine cooling water is provided at the other end of the exhaust gas heat exchanger body. In the exhaust gas heat exchanger,
The catalyst is arranged with a gap in the back of one end of the exhaust gas heat exchanger body, an exhaust gas inlet for introducing the exhaust gas toward the outer peripheral surface of the catalyst is provided, and the exhaust gas from the exhaust gas inlet is supplied to the catalyst. An exhaust gas heat exchange device, wherein the exhaust gas heat exchange device is supplied to the heat exchanger through the catalyst through the inner space from the outer peripheral surface of the gas.   A flow hole that fixes the catalyst with two substantially annular fixed rings and distributes exhaust gas that flows from the exhaust gas inlet and flows along the outer peripheral surface of the catalyst to the back fixed ring through the back clearance. The exhaust gas heat exchanger according to claim 1, wherein:   3. The exhaust gas heat exchanger according to claim 1, wherein the exhaust gas heat exchanger main body includes a body portion and a cap body, and the catalyst is disposed on the cap body.   The exhaust gas heat exchange device according to any one of claims 1 to 3, wherein the fixed ring on the back side is formed in a substantially C shape by cutting out a portion facing the exhaust gas inlet.   The exhaust gas heat exchange device according to any one of claims 1 to 3, wherein the fixed ring has a curved cross section and can absorb expansion and contraction of thermal expansion at a curved portion of the cross section. A compressor that constitutes the refrigerant circuit, an engine that drives the compressor, a catalyst that purifies the exhaust gas of the engine, and a heat exchanger that exchanges heat between the purified exhaust gas and the engine coolant are provided inside. In an air conditioner equipped with an exhaust gas heat exchanger body,
The catalyst is arranged with a gap in the back of one end of the exhaust gas heat exchanger body, an exhaust gas inlet for introducing the exhaust gas toward the outer peripheral surface of the catalyst is provided, and the exhaust gas from the exhaust gas inlet is supplied to the catalyst. An air conditioner characterized in that the air conditioner circulates from the outer peripheral surface of the gas to the back gap, passes the catalyst, and supplies the heat exchanger.

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