WO2007063978A1

WO2007063978A1 - Heat exchanger

Info

Publication number: WO2007063978A1
Application number: PCT/JP2006/324055
Authority: WO
Inventors: Etsuo Shinmura; Koichiro Take
Original assignee: Showa Denko K.K.
Priority date: 2005-12-02
Filing date: 2006-12-01
Publication date: 2007-06-07
Also published as: DE112006003241T5; JP2007155183A

Abstract

The invention relates to a heat exchanger in which a nonazeotropic mixed refrigerant (R) containing carbon dioxide is passed through heat exchanger tubes (12) and heat exchange is conducted between the refrigerant (R) and air (A). The heat exchanger tubes (12) are arranged in parallel with the lengthwise directions of the tubes (12) parallel to the flow direction of air (A). The flow directions of the refrigerant (R) passing through the tubes (12) are made counter to the flow direction of air (A). Thus, the invention provides a heat exchanger which can attain efficient heat exchange in spite of its using a nonazeotropic mixed refrigerant containing carbon dioxide.

Description

Specification

Heat exchanger

Technical field

TECHNICAL FIELD [0001] The present invention relates to a heat exchanger using a non-azeotropic mixed refrigerant containing carbon dioxide and carbon dioxide as a refrigerant, and a related technique.

Background art

FIG. 18 is a view showing a cross-flow type heat exchanger for a car air conditioner in which the refrigerant flow direction is orthogonal to the air flow direction. As shown in the figure, between a pair of headers (1) (1) along the vertical direction, multiple heat exchange tubes (2) with both ends communicating with both headers (1) (1) are arranged in parallel. At the same time, fins (3) are arranged between the tubes (2). Further, a refrigerant inlet nozzle (4) is provided at the lower end of the right header (1), and a refrigerant outlet nozzle (5) is provided at the upper end. In addition, a partition plate (6) is provided in the header (1) (1), and the heat exchange tube (2) is divided into a plurality of paths. Then, the refrigerant force flowing from the refrigerant inlet nozzle (4) flows in each path in order to meander, and the refrigerant outlet nozzle (5) force flows out.

[0003] On the other hand, in heat exchangers used for car air conditioners, conventional refrigerants such as R134a have been used as refrigerant circulating in the system. Because it is a fluorinated substance, a refrigeration cycle that uses carbon dioxide (CO), which exists in nature, as a refrigerant, as shown in Patent Document 1 as an air-conditioning technology for defluorocarbonization, is used.

2

Collecting eyes.

Patent Document 1: JP 2001-99522

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in a refrigeration cycle using a refrigerant that also has a single component power of carbon dioxide and carbon dioxide, the pressure inside the refrigerant system is much higher than that of the chlorofluorocarbon refrigerant, so that pressure resistance is ensured. It becomes difficult. Thus, as a result of daily research, the present inventors have achieved a desired effect by using a non-azeotropic mixed refrigerant mainly composed of carbon dioxide and carbon dioxide existing in nature. I found what I can expect.

[0005] However, in a refrigeration cycle that employs a non-azeotropic mixed refrigerant mainly composed of diacid and carbon dioxide, due to its chemical characteristics, the refrigerant temperature changes during the evaporation process and the condensation (cooling) process, A temperature difference of tens to tens of degrees is generated between the refrigerant inlet portion and the refrigerant outlet portion acting as a cooling device or an evaporator, and has a large temperature gradient.

[0006] For example, FIG. 17 shows a Mollier diagram of a refrigeration cycle using a non-azeotropic mixed refrigerant in which the ratio of carbon dioxide and dimethyl ether (DME) is 90:10. As can be understood from the figure, in the process of evaporation of the refrigerant from point d to point a, the evaporation temperature gradually increases while the pressure is constant. Furthermore, in the cooling (condensation) process from point b to point c, the pressure is constant, but the temperature gradually decreases.

[0007] When the non-azeotropic mixed refrigerant having a temperature gradient in the cooling process or the like is applied to the cross-flow type heat exchanger as shown in Fig. 18 as it is, for example, the core portion on the refrigerant inlet side (heat exchange) In the lower area of the vessel, the refrigerant temperature is lower in the core part (upper area of the heat exchanger) on the refrigerant outlet side where the refrigerant temperature is higher. For this reason, although the temperature of the refrigerant is high and a large temperature difference with the air can be secured in the vicinity of the refrigerant inlet, the temperature differential force with the air becomes small near the refrigerant outlet with a low refrigerant temperature. Since the exchange capacity has been significantly reduced, there is a concern that the heat exchange cannot be performed efficiently over the entire heat exchange area.

[0008] Preferred embodiments of the present invention have been made in view of the foregoing and Z or other issues in the related art. Preferred embodiments of the present invention are those that can significantly improve existing methods and Z or equipment.

[0009] The present invention has been made in view of the above circumstances, and provides a heat exchange and related technology capable of efficiently performing heat exchange while using a non-azeotropic mixed refrigerant containing carbon dioxide. The purpose is to provide.

[0010] Other objects and advantages of the present invention will be apparent from the following preferred embodiments.

Means for solving the problem

In order to achieve the above object, the present invention is summarized as follows. [0012] [1] Non-azeotropic mixed refrigerant containing diacid-carbon is circulated in the heat exchange path, and heat exchange between the refrigerant and air is performed,

The heat exchange is characterized in that the flow direction of the refrigerant flowing through the heat exchange path is opposed to the air flow direction.

[0013] [2] A heat exchange in which a non-azeotropic refrigerant mixture containing carbon dioxide is circulated through a plurality of heat exchange tubes and heat is exchanged between the refrigerant and air, While several heat exchange tubes are arranged in parallel with their length direction parallel to the air flow direction,

A heat exchanger characterized in that the flow direction of the refrigerant flowing through the heat exchange tube is opposed to the flow direction of air.

[3] [3] An inflow side main header is disposed on the leeward side with respect to the air flow direction, and an outflow side main header is disposed on the leeward side.

An end portion of the inflow side subheader is connected in communication with the inflow side main header, an end portion of the outflow side subheader is connected in communication with the outflow side main header, and the plurality of heat exchange tube forces have their inflow side ends 3. The apparatus according to item 2, wherein the inflow side subheader is arranged in parallel between the inflow side subheader and the outflow side subheader with the outflow side end connected in communication with the outflow side subheader. Heat exchanger.

[4] A pair of inflow side main headers are arranged in parallel on the leeward side with respect to the air flow direction, and a pair of outflow side main headers are arranged in parallel on the upwind side corresponding to the inflow side main header. Arranged,

Both end portions of the inflow side subheader are connected to the pair of inflow side main headers, respectively,

Both end portions of the outflow side subheader are respectively connected to the pair of outflow side main headers,

The plurality of heat exchange tube forces The inflow side and the outflow side in a state where the inflow side end portion is connected to the inflow side subheader and the outflow side end portion is connected to the outflow side subheader. In the previous item 2 or 3 placed in parallel between subheaders The described heat exchanger.

[5] A plurality of the inflow side subheaders are provided in parallel along the length direction of the inflow side main header,

A plurality of the outflow side subheaders are provided in parallel along the length direction of the outflow side main header,

5. The heat exchanger according to 3 or 4 above, wherein the heat exchange tube is provided between the corresponding inflow side subheader and the outflow side subheader.

[0017] [6] Non-azeotropic mixed refrigerant containing carbon dioxide and carbon dioxide is circulated through a plurality of heat exchange tubes and heat exchange is performed between the refrigerant and air. The plurality of heat exchange tubes are arranged in parallel to form a path,

A plurality of the paths are arranged in parallel along the air flow direction in a state where the heat exchange tubes are orthogonal to the air flow direction,

When the refrigerant is circulated sequentially through the plurality of paths, the downstream path in the refrigerant flow direction is disposed on the windward side in the air flow direction with respect to the upstream path.

[7] Of the plurality of paths, a path disposed at the downstream end is connected to the inflow side header of the inflow side end of the heat exchange tube in the path disposed at the upstream end. The outflow side end of the heat exchange tube is connected in communication with the outflow side header, and the outflow side end of the heat exchange tube in the nose arranged upstream of the two adjacent paths is arranged downstream. 7. The heat exchanger according to item 6 above, wherein the inflow side end portion of the heat exchange tube in the path to be communicated via the coolant turn header.

[0019] [8] The heat exchange according to any one of 1 to 7 above, wherein the refrigerant is composed of a mixed refrigerant with dimethyl ether containing carbon dioxide as a main component.

[9] The heat exchanger according to any one of items 2 to 7, wherein the heat exchange tube is provided with a plurality of refrigerant passage holes continuous in the tube length direction in parallel in the tube width direction.

[0021] [10] In the heat exchange tube, a communication hole that connects adjacent refrigerant passage holes is formed in a partition wall between adjacent refrigerant passage holes, and the refrigerant flowing through the refrigerant passage holes is communicated with the communication tube. 10. The heat exchanger according to 9 above, wherein the heat exchanger is configured to be able to go back and forth between the refrigerant passage holes through the holes. [0022] [11] A refrigerant cooler comprising the heat exchanger described in any one of items 1 to 10 above.

[0023] [12] An evaporator comprising the heat exchanger described in any one of items 1 to 10 above.

[13] In the refrigeration cycle, the refrigerant compressed by the compressor is cooled by the cooler, and the cooled refrigerant is decompressed by the decompression means and evaporated by the evaporator, and then returns to the compressor. ,

A refrigeration cycle, wherein at least one of the cooler and the evaporator is configured by the heat exchange described in any one of 1 to 10 above.

[14] An automotive air conditioner comprising the refrigeration cycle according to item 13 above.

[0026] [15] A heat exchange method in which a non-azeotropic mixed refrigerant containing carbon dioxide is circulated through a heat exchange path and heat is exchanged between the refrigerant and air,

A heat exchange method characterized in that the flow direction of the refrigerant flowing through the heat exchange path is opposed to the air flow direction.

[0027] [16] The heat exchange method according to item 15, wherein the refrigerant is composed of a refrigerant mixture with dimethyl ether containing carbon dioxide as a main component.

The invention's effect

[0028] According to the heat exchanger of the above-mentioned invention [1], when heat is exchanged between the refrigerant and the air in using the diacid-carbon-carbon mixed refrigerant having a temperature gradient in the cooling process and the evaporation process, the refrigerant The counter flow method is adopted in which the flow direction of the air is opposed to the flow direction of the air.Therefore, a constant temperature difference between the refrigerant and the air is maintained until the heat exchange is started and the force is finished. Can be ensured, and heat can be exchanged efficiently.

[0029] According to the heat exchanger of the above invention [2], the flow direction of the refrigerant can be reliably opposed to the flow direction of the air, and the above-described effects can be reliably obtained.

[0030] According to the heat exchange in the above inventions [3] to [5], the refrigerant can be distributed in a well-balanced and evenly distributed manner in the heat exchange, and the heat exchange performance can be further improved. .

[0031] According to the heat exchanger of the above inventions [6] and [7], the flow direction of the refrigerant is changed according to how the air flows. The direction can be made to face the direction in a pseudo manner, and the same effect can be obtained as described above.

[0032] According to the heat exchange in the invention [8], the above-mentioned effect can be obtained more reliably.

[0033] According to the heat exchanger of the above inventions [9] and [10], heat can be exchanged more efficiently.

[0034] According to the invention [11], a refrigerant cooler having the same effect as described above can be provided.

[0035] According to the invention [12], an evaporator having the same effects as described above can be provided.

[0036] According to the invention [13], it is possible to provide a refrigeration cycle having the same effect as described above.

[0037] According to the invention [14], an automotive air conditioner having the same effects as described above can be provided.

[0038] According to the heat exchange method of the above invention [15], heat exchange can be performed efficiently as described above.

[0039] According to the heat exchange method of the above invention [16], the above-mentioned effect can be obtained more reliably.

Brief Description of Drawings

FIG. 1 is a perspective view showing a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the heat exchanger according to the first embodiment.

FIG. 3 is a plan view showing the heat exchanger of the first embodiment.

FIG. 4 is a perspective view showing a refrigerant flow in the heat exchanger of the first embodiment.

FIG. 5 is a cross-sectional view showing a heat exchange tube applied to the heat exchanger of the first embodiment.

FIG. 6 is an exploded perspective view showing an inter-passage heat exchange tube applicable to the heat exchanger of the present invention.

[FIG. 7] FIG. 7 shows an inter-passage heat exchange tube applicable to the heat exchanger of the present invention. FIG. FIG. 4A is a side sectional view, and FIG. 4B is a front sectional view.

FIG. 8 is a circuit diagram of a refrigeration cycle in which the heat exchanger of the present invention can be employed.

FIG. 9 is a perspective view showing a heat exchanger according to a second embodiment of the present invention.

FIG. 10 is an exploded perspective view showing the heat exchanger according to the second embodiment.

FIG. 11 is a plan view showing a heat exchanger according to the second embodiment.

[FIG. 12] FIG. 12 is a perspective view showing a refrigerant flow in the heat exchanger according to the second embodiment.

FIG. 13 is a perspective view showing heat exchange according to a third embodiment of the present invention.

FIG. 14 is a plan view showing a heat exchanger according to a third embodiment.

FIG. 15 is a perspective view showing heat exchange according to a fourth embodiment of the present invention.

FIG. 16 is a plan view showing a heat exchanger according to a fourth embodiment.

FIG. 17 is a Mollier diagram of a refrigeration cycle using a mixed refrigerant of carbon dioxide and dimethyl ether.

FIG. 18 is a front view showing a conventional heat exchanger.

Explanation of symbols

10, 20, 30, 40

12 ··· Heat exchange tube

15a -... Inlet main header

15b ... Outflow side main header

16a- ··· Inflow side subheader

16b ... Outflow side subheader

17 ··· Communication hole for refrigerant turn

35a… Inlet header

35b… Outflow header

36 ... Header for refrigerant turn

45a- "inflow header

45b… Outflow header

46a, 46b ... Refrigerant turn header

A ... Air (outside air) CP ... Compressor

EV ... Evaporator

膨張 ... Expansion valve (pressure reduction means)

Ρ1 ~ Ρ3 ··· Pass

R: Refrigerant

RD ... Refrigerant cooler

BEST MODE FOR CARRYING OUT THE INVENTION

[0042] <First embodiment>

FIG. 1 is a perspective view showing a heat exchanger according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view showing the heat exchanger, and FIG. 3 is a plan view showing the heat exchanger. As shown in these drawings, the heat exchanger (10) of the first embodiment includes a pair of inflow side main headers (15a) (15a) and a large number of headers (15a) (15a) arranged between the headers (15a) (15a). Inflow side subheader (16a), a pair of outflow side main headers (15b) (15b), a number of outflow side subheaders (16b) arranged between the headers (15b) (15b), and the inflow side And a core (11) arranged between the outflow side subheaders (16a) and (16b) as basic components.

[0043] The inflow-side and outflow-side main headers (15a) and (15b) are formed of a round pipe member made of aluminum or aluminum alloy, and are configured to allow refrigerant to flow therethrough.

[0044] Then, the pair of inflow side main headers (15a) (15a) are positioned on both sides of the rear side with respect to the core (11) when the direction of force is on the windward side with respect to the flow direction of the air (A). Further, they are arranged in parallel to each other along the vertical direction.

[0045] Further, the lower ends of the pair of inflow side main headers (15a) (15a) are closed, while the upper ends are opened to constitute refrigerant inlets (14a) (14a).

[0046] The pair of outflow side main headers (15b) and (15b) correspond to the pair of inflow side main headers (15a) and (15a) in parallel with each other at the front both sides of the core (11). It is arranged along the vertical direction.

[0047] Further, the lower ends of the pair of outflow side main headers (15b) (15b) are closed, while the upper ends are opened to constitute refrigerant inlets (14b) (14b). [0048] The inflow side and outflow side subheaders (16a) and (16b) are formed by round pipe members made of aluminum or aluminum alloy having a diameter slightly smaller than that of the main headers (15a) and (15b). The refrigerant is configured to be able to circulate.

[0049] Between the pair of inflow side main headers (15a) (15a), a number of inflow side subheaders

(16a) Force With both ends connected to both main headers (15a) and (15a), they are arranged in parallel in the vertical direction (main header length direction) at predetermined intervals. As a result, the refrigerant introduced from the refrigerant inlets (14a) (14a) into the inflow side main headers (15a) (15a) is distributed and flows into the respective inflow side subheaders (16a). .

[0050] Further, between the pair of outflow side main headers (15b) (15b), a large number of outflow side subheaders (16b) forces are connected in communication with both main headers (15b) (15b). Thus, they are arranged in parallel in the vertical direction at predetermined intervals. As a result, the refrigerant in each outflow side subheader (16b) is introduced into the pair of outflow side main headers (15b) (15b) and flows out from the respective refrigerant outlets (14b) (14b). Yes.

[0051] The inflow side subheader (16a) and the outflow side subheader (16b) are arranged at the same pitch in the vertical direction.

[0052] The core (11) has a number of heat exchange tubes (12). As shown in FIG. 5, the heat exchange tube (12) has an extruded tube made of aluminum or aluminum alloy, and has a flat cross-sectional shape in which the height (thickness) dimension is smaller than the width dimension. Yes.

[0053] The heat exchange tube (12) is provided with refrigerant passage holes (12a) extending continuously in the length direction and arranged in parallel in the width direction. In the present embodiment, the refrigerant passage hole (12a) is configured as a heat exchange passage.

[0054] This heat exchange tube (12) force In the state where the length direction is directed forward and backward and the width direction is directed to the left and right direction, the adjacent tubes are joined to each other with no gap therebetween, while Direction). A plurality of heat exchange tubes (12) arranged side by side in the lateral direction and corrugated fins (13) made of aluminum or an aluminum alloy are alternately stacked in the up-down direction, and are stacked. ) Is formed.

[0055] In the core (11), the heat exchange tube (12) is connected to the sub header (16a) (16b). Are arranged at predetermined intervals in the vertical direction.

[0056] The rear end portion (inflow side end portion) of each heat exchange tube (12) of the core (11) is connected to the corresponding upstream subheader (16a) and connected to the front end portion (outflow side). End portions) are connected in communication with the corresponding downstream sub-headers (16b). As a result, the heat exchanger (10) of the first embodiment is formed.

[0057] In this heat exchanger (10), for example, as a fin (13) or a header (15a) (15b) (16a) (16b), an aluminum brazing brazed at least on one side of the core material It is made up of things made of a sheet. Then, after the heat exchange tubes (12), fins (13), and headers (15a) (15b) (16a) (16b) are temporarily assembled into a heat exchanger shape, the temporary assembly products are batched in the furnace. By brazing, the whole is joined and integrated, and the heat exchange (10) is manufactured.

[0058] As described above, the heat exchanger (10) of the first embodiment uses carbon dioxide (CO

2) A non-azeotropic mixed refrigerant whose main component is the main component is used. For example, a non-azeotropic mixed refrigerant in which 99 to 60% by weight of carbon dioxide and 1 to 40% by weight of dimethyl ether (DME) are mixed is used.

[0059] The heat exchanger (10) of the present embodiment is suitably used as a condenser (refrigerant cooler), an evaporator, or the like in a refrigeration cycle for a car air conditioner. For example, when used as a refrigerant cooler, as shown in FIG. 8, the refrigerant circuit constituting the refrigeration cycle includes a compressor other than the refrigerant cooler (RC) having the heat exchange (10) force of the present embodiment. (CP), expansion valves (EX) and other decompressors and evaporators (EV) are provided. The refrigerant outlet of the compressor (CP) is connected to the refrigerant inlet (14a) (14a) of the heat exchanger (10) as the refrigerant cooler (RC), and the refrigerant outlet (14b) of the heat exchanger (10) (14b) is connected to the refrigerant inlet of the evaporator (EV) via the expansion valve (EX). Further, the refrigerant outlet of the evaporator (EV) is connected to the refrigerant inlet of the compressor (CP).

[0060] In the heat exchanger (10), the outflow side header (15b) (16b) side is arranged on the windward side with respect to the flow direction of the air (A), and the inflow side header (15a) (16a) side is arranged on the leeward side. It is installed as follows.

In this refrigeration cycle, the refrigerant compressed by the compressor (CP) is converted into a pair of inflow side main headers (15a) (15a) in the heat exchanger (10) as a cooler (RC). To that It is introduced from the refrigerant inlet (14a) (14a). As shown in Figs. 1 and 4, the refrigerant (R) introduced into the main header (15a) (15a) is evenly distributed from both sides into each inflow side subheader (16a) and flows into each sub-header (16a). It flows into the refrigerant passage hole (12a) of the exchange tube (12). Thus, the refrigerant (R) flowing into the heat exchange tube (12) is cooled by exchanging heat with the outside air (A) while passing through the refrigerant passage hole (12a).

[0062] Here, in the present embodiment, since the flow direction of the refrigerant (R) flowing through the heat exchange tube (12) is opposed to the flow direction of the air (A), heat is exchanged efficiently. be able to. That is, the refrigerant (R) employed in the present embodiment is composed of a mixed refrigerant with dimethyl ether containing carbon dioxide as a main component, and this mixed refrigerant (R) is used in the condensation process (cooling process). Has a temperature gradient with a constant pressure and a gradual drop in temperature. On the other hand, the temperature of air (A) gradually increases by exchanging heat with refrigerant (R). In other words, in the cooling process, the refrigerant (R) that decreases in temperature and the air (A) that increases in temperature are opposed to each other. A certain temperature difference can be ensured between the two, the heat exchange capacity can be improved, and heat can be exchanged efficiently.

[0063] On the other hand, the refrigerant (R) cooled through the heat exchange tube (12) is introduced into the outflow side subheader (16b), and a pair of outflow side main headers (15b) (15b ). Furthermore, the refrigerant (R) that has flowed into the main header (15b) (15b) flows out from the refrigerant outlet (14b) (14b), is decompressed by the expansion valve (EX), and then flows into the evaporator (EV). Is done. The refrigerant then evaporates through the evaporator (EX) to absorb heat from the outside air and cool the outside air. In addition, the refrigerant flowing out of the evaporator (EV) returns to the compressor (CP).

[0064] Even when the heat exchanger (10) of the present embodiment is used as an evaporator (EV) in a refrigeration cycle as shown in Fig. 8, heat can be exchanged efficiently. That is, after the refrigerant (R) cooled through the refrigerant cooler (RC) is depressurized by the expansion valve (EX), the inflow header (15a) of the heat exchanger (10) as the evaporator (EV) (15a) ( It is introduced into the heat exchange tube (12) through 16a). Heat is exchanged between the refrigerant (R) passing through the heat exchange tube (12) and the air (A). During this evaporation process, the refrigerant (R) is While air (A) gradually decreases the temperature while increasing the temperature gradually, in this embodiment, the flow direction of the refrigerant (R) is opposed to the flow direction of the air (A). Therefore, throughout the evaporation process, a certain temperature difference between the refrigerant (R) and the air (A) can be reliably ensured, and the heat exchange capacity and thus the heat exchange efficiency can be improved. That's right.

[0065] On the other hand, the refrigerant that has evaporated through the heat exchange tube (12) flows out through the outflow side sub-header (16b) and the pair of outflow side main headers (15b) (15b), and is compressed in the compressor. Return to (CP).

[0066] As described above, according to the heat exchanger (10) of the first embodiment, a mixed refrigerant of carbon dioxide and dimethyl ether that decreases in temperature in the cooling process and increases in temperature in the evaporation process is used. Therefore, when heat exchange is performed between the refrigerant (R) and the air (A), a counter flow method is adopted in which the flow direction of the refrigerant (R) is opposed to the flow direction of the air (A). Therefore, for example, in the cooling process, heat is exchanged between the refrigerant (R) whose temperature drops and the air (A) whose temperature rises, so that the refrigerant (R) and air (A) are exchanged throughout the cooling process. A certain temperature difference can be secured and heat can be exchanged efficiently. Furthermore, in the evaporation process, by exchanging heat between the refrigerant (R) whose temperature rises and the air (A) whose temperature drops, a constant temperature difference can be secured between the two throughout the evaporation process, and heat can be efficiently generated. Can be exchanged.

[0067] Further, in the heat exchanger (10) of the present embodiment, the inflow side main header (15a) is provided on both sides.

Since (15a) is arranged, the refrigerant (R) can be introduced into the core (11) through the subheader (16a) in a balanced manner with both side forces. For this reason, it is possible to disperse the entire core (11) without deviation, and the heat exchange efficiency can be further improved.

[0068] Further, in the heat exchange (10) of the present embodiment, since the outflow side main headers (15b) (15b) are arranged on both sides, the refrigerant (R) that has passed through the core (11) is used as the subheader. Via (16b), it can be evenly distributed on both sides and led to the outflow main header (15b) (15b). Therefore, the refrigerant (R) can smoothly flow out to the core (11) force outflow side main header (15b) (15b), and the heat exchange efficiency can be further improved.

[0069] In this embodiment, the heat exchange tube (12) is a passage as shown in Figs. An intercommunicating heat exchange tube can also be used. This inter-passage heat exchange tube (

12) is provided with a plurality of communication passage holes (12c) that communicate with adjacent refrigerant passage holes to a partition wall (12b) between the adjacent refrigerant passage holes, as well as a plurality of refrigerant passage holes (12a) provided inside. Is formed. When this inter-passage heat exchange tube (12) is used, the refrigerant (R) moves back and forth between the refrigerant passages through the communication holes (12c) in the tube, so that the refrigerant (R) However, since the inside of the tube is evenly distributed, it is possible to prevent uneven distribution of the refrigerant and to further improve the heat exchange efficiency.

[0070] <Second Embodiment>

9 to 12 are views showing a heat exchanger (20) according to the second embodiment of the present invention. As shown in these figures, in the heat exchanger (20) of the second embodiment, only one inflow side main header (15a) is arranged on one side and the outflow side main header (15b) is on one side. Only one is placed in each.

In addition, one end of each of the inflow side subheaders (16a) is connected to the one inflow side main header (15a) on one side, and the other end side is closed. In addition, one end of each of the large number of outflow side subheaders (16b) is connected to the single outflow side main header (15b) on one side, and the other end side is closed.

In the second embodiment, other configurations are substantially the same as those in the first embodiment, and thus the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

[0073] In the heat exchanger (20) of the second embodiment as well, when using a mixed refrigerant with dimethyl ether containing carbon dioxide as a main component, the refrigerant (R) and air (A) are counterflowed. For example, during the cooling process, heat is exchanged between the refrigerant (R) that drops in temperature and the air (A) that rises in temperature during the cooling process! As a result, a certain temperature difference can be secured between the refrigerant (R) and the air (A), and heat can be exchanged efficiently. Furthermore, in the evaporation process, by exchanging heat between the rising temperature refrigerant (R) and the decreasing temperature air (A), a constant temperature difference between the two can be secured throughout the evaporation process, and heat can be efficiently generated. Can be exchanged.

[0074] Further, according to the present embodiment, the inflow side and outflow side main headers (15a) (15b) are added. Since it is configured by only one on one side, the number of components can be reduced, the structure can be simplified, the apparatus can be reduced in size and weight, and the cost can be reduced.

[0075] <Third embodiment>

FIG. 13 is a perspective view showing a heat exchanger (30) according to a third embodiment of the present invention, and FIG. 14 is a plan view showing the heat exchanger (30). As shown in both figures, the heat exchanger (30) of the third embodiment includes an inflow header (35a), an outflow header (35b), a refrigerant turn header (36), and two paths (PI). And a core (31) having (P2) as a basic component.

[0076] The inflow side and outflow side headers (35a) and (35b) are arranged on one side with respect to the core (31) when the direction facing the windward is forward based on the flow direction of the air (A) ( They are arranged along the vertical direction in the front-to-back direction (left side of Fig. 13). At this time, the inflow header (35a)

It is arranged behind the outflow side header (35b).

[0077] Each header (35a) (35b) is constituted by a round pipe member made of aluminum or aluminum alloy.

In addition, a refrigerant inlet nozzle (34a) is provided at the lower part of the inflow side header (35a), and the refrigerant flows from the nozzle (34a) into the inflow side header (35a). .

[0079] Further, a refrigerant outlet nozzle (34b) is provided at the upper part of the outflow side header (35b) so that the refrigerant in the outflow side header (35b) flows out of the refrigerant outlet nozzle (34b). ing.

[0080] The refrigerant turn header (36) is disposed along the vertical direction on the other side of the core (31) (the right side in FIG. 13). The refrigerant turn header (36) is formed of an elongated aluminum or aluminum alloy pipe member having a long cross section in the front-rear direction, and the front half corresponds to the outflow header (35b) and the latter half. Are arranged so as to correspond to the inflow side header (35a).

[0081] The core (31) has a first path (P1) constituting the latter half and a second path (P2) constituting the front half.

[0082] Each path (PI) (P2) includes a heat exchange tube (12) disposed along the left-right direction, One tophine (13) is alternately stacked in the vertical direction, and each layer is arranged.

In the present embodiment, the heat exchange tube (12) is constituted by the inter-passage heat exchange tube shown in FIGS. However, in the present embodiment, the heat exchange tube (12) can also be constituted by an extruded tube shown in FIG.

[0084] In the first path (P1), one end side of each heat exchange tube (12) is connected to the inflow side header (35a), and the other end side is the second half of the refrigerant turn header (36). Are connected to each other. Furthermore, the second path (P2) is arranged in parallel on the front side of the first path (P1), and one end of each heat exchange tube (12) is connected to the outflow header (35b). At the same time, the other end is connected to the front half of the refrigerant turn header (35).

[0085] In this heat exchanger (10), for example, fins (13) or headers (35a) (35b) (36) made of an aluminum brazing sheet in which a brazing material is clad on at least one side of a core material, etc. It is constituted by. After the heat exchange tubes (12), fins (13), and headers (35a) (35b) (36) are temporarily assembled into a heat exchanger shape, the temporarily assembled products are collectively brazed in the furnace. As a result, the whole is joined and integrated, and the heat exchanger (30) is manufactured.

[0086] The heat exchanger (30) of the present embodiment uses a non-azeotropic mixed refrigerant mainly composed of carbon dioxide, for example, a mixed refrigerant of carbon dioxide and dimethyl ether, as described above.

[0087] When the heat exchanger (30) of the present embodiment is used as a refrigerant cooler (condenser) in a refrigeration cycle for a car air conditioner, for example, the refrigerant (R) compressed by the compressor is heated. It is introduced into the inflow side header (35a) in the exchanger (30) and then introduced into each heat exchange tube (12) of the first path (P1). Subsequently, the refrigerant (R) is cooled by exchanging heat with the outside air (A) while passing through each heat exchange tube (12) in the first path (P1), and is then cooled to the refrigerant turn header (36). ) Will be introduced in the second half.

[0088] The refrigerant (R) introduced into the second half of the refrigerant turn header (36) goes around the first half and is introduced into each heat exchange tube (12) of the second path (P2). Thereafter, the refrigerant (R) is cooled by exchanging heat with the outside air (A) while passing through the heat exchange tubes (12) of the second path (P2). Rejected and introduced into the outflow header (35b).

Here, in the present embodiment, since the refrigerant passes through the first path (P1) on the leeward side and then passes through the second path (P2) on the leeward side, the refrigerant temperature is the first. The air A temperature is lower when passing the first pass than when passing the second pass, whereas the temperature of the air A is higher when passing the first pass than when passing the second pass. That is, in the cooling process, the refrigerant (R) whose temperature decreases and the air (A) whose temperature rises are made to face each other in a pseudo manner, so that the refrigerant (R) and air (A) are in the first and second passes. (PI) While passing through (P2), the temperature difference between the two can be secured, and heat can be exchanged efficiently.

[0090] On the other hand, the refrigerant (R) cooled by the heat exchanger (30) flows out of the refrigerant outlet nozzle (34b) of the outflow side header (35b) and is depressurized by the expansion valve. Inflow. Then, the refrigerant passes through the evaporator and evaporates, thereby absorbing heat from the outside air and cooling the outside air. Further, the refrigerant flowing out from the evaporator returns to the compressor.

[0091] When the heat exchanger (30) of the present embodiment is used as an evaporator of a refrigeration cycle, the refrigerant (R) passes through the first and second passes (PI) (P2) in this order. On the other hand, air (A) passes through the second and first passes (P2) (P1) in this order to lower the temperature. Accordingly, as described above, a constant temperature difference between the refrigerant (R) and the air (A) can be secured in the entire evaporation process, and the heat exchange efficiency can be improved.

[0092] As described above, according to the heat exchange (30) of the present embodiment, when using a mixed refrigerant of diacid-carbon and dimethyl ether, which decreases in temperature in the cooling process and increases in temperature in the evaporation process, When exchanging heat between the refrigerant (R) and the air (A), a pseudo counter flow method is adopted in which the flow direction of the refrigerant (R) is substantially opposed to the flow direction of the air (A). Therefore, it is possible to ensure a certain temperature difference between the refrigerant (R) and the air (A) over the entire cooling process or the entire evaporation process, and to exchange heat efficiently.

[0093] <Fourth embodiment>

FIG. 15 is a perspective view showing a heat exchanger (40) according to a fourth embodiment of the present invention, and FIG. 16 is a plan view showing the heat exchanger (40). As shown in both figures, the heat exchanger (40) of the fourth embodiment includes an inflow header (45a), an outflow header (45b), and first and second refrigerant turn headers (46a) (46b). ) And a core (41) having three paths (PI) to (P3) It is prepared as a typical component.

[0094] In the paths (P1) to (P3) constituting the core (41), the heat exchange tubes (12) and the corrugated fins (13) are alternately laminated as in the third embodiment. It is composed.

Then, the first path (P1), the second path (P2), and the third path (P3) are arranged in parallel in order of the leeward (rearward) force to form the core (41).

[0096] The inflow side header (45a) is arranged corresponding to the first path (P1) on one side (right side) of the core (41), and each header of the first path (P1) is placed on the header (45a). One end of the heat exchange tube (12) is connected in communication.

[0097] The first refrigerant turn header (46a) is arranged corresponding to the first and second paths (PI) (P2) on the other side (left side) of the core (41), and the header (46a) The other end of each heat exchange tube (12) in the first path (P1) is connected to the second half of the first path (P1), and the other end of each heat exchange tube (12) in the second path (P2) is connected to the first half. Connected and connected.

[0098] The second refrigerant turn header (46b) is arranged corresponding to the second and third paths (P2) (P3) on one side (right side) of the core (41), and the header (46b) One end of each heat exchange tube (12) in the second path (P2) is connected to the second half of the pipe, and one end of each heat exchange tube (13) in the third path (P3) is connected to the first half. It has been.

[0099] Further, the outflow side header (45b) is arranged corresponding to the third path (P3) on the other side (left side) of the core (41), and the header (45b) has the third path (P3). The other end of each heat exchange tube (12) is connected in communication!

[0100] The refrigerant inlet nozzle (44a) is provided at the lower part of the inflow side header (45a), and the refrigerant outlet nozzle (44b) is provided at the upper part of the outflow side header (45b). .

[0101] In this heat exchanger (40), the refrigerant (R) introduced into the inflow side header (45a) passes through the first path (P1), and the first refrigerant turn header (46a ), Passes through the second path (P2), and then passes back through the second refrigerant turn header (46b), passes through the third path (P3), and then passes through the outflow header (45b). Leaked. In this way, the refrigerant (R) is passed in the order of the first to third passes (P1) to (P3), while the outside air (A) is passed in the order of the third to first passes (P3) to (P1). The refrigerant (R) is cooled (condensed) or evaporated by heat exchange between (R) and air (A). [0102] Also in this heat exchange ^^ (40), the flow of the refrigerant (R) is similar to the above when using a non-azeotropic mixed refrigerant containing diacid-carbon that changes in temperature during the cooling or evaporation process. Since the counter counter flow method is adopted in which the direction is substantially opposite to the flow direction of air (A), the refrigerant (R) and air (A) are used throughout the cooling or evaporation process. A certain temperature difference can be reliably ensured between them, and heat can be exchanged efficiently.

[0103] In the above-described embodiment and the like, the case where the heat exchanger of the present invention is applied to a refrigerant cooler or an evaporator of a refrigeration cycle has been described as an example. However, the present invention is not limited thereto, and May be applied to other heat exchange ^^.

[0104] This application is accompanied by the priority claim of Japanese Patent Application No. 2005-34905 4 filed on December 2, 2005, the disclosure of which constitutes part of the present application as it is. It is something.

[0105] The terms and expressions used herein are for illustrative purposes only and are not intended to be interpreted in a limited way. It should be recognized that various modifications within the claimed scope of the present invention are allowed without departing from such equivalents.

[0106] While this invention may be embodied in many different forms, this disclosure should be considered as providing examples of the principles of the invention, and these examples are Numerous illustrated embodiments are described herein with the understanding that the present invention is not intended to be limited to the preferred embodiments illustrated and illustrated herein or illustrated.

[0107] The power of the illustrated embodiment of the present invention is described here. The present invention is based on this disclosure, which is not limited to the various preferred embodiments described herein! It encompasses any and all embodiments with equivalent elements, modifications, deletions, combinations (eg, combinations of features across various embodiments), improvements, and Z or changes that can be recognized by any person skilled in the art. Claim limitations should be construed broadly based on the terminology used in the claims and should not be limited to the embodiments described herein or in the process of this application. Such embodiments should be construed as non-exclusive.

Industrial applicability The heat exchanger and related technology of the present invention can be employed in a refrigeration system for a car air conditioner, for example.

Claims

The scope of the claims

[1] Non-azeotropic refrigerant mixture containing diacid-carbon is circulated through the heat exchange path and heat exchange between the refrigerant and air

[2] Non-azeotropic mixed refrigerant containing diacid and carbon dioxide is circulated through multiple heat exchange tubes and heat exchange is performed between the refrigerant and air. ,

While the plurality of heat exchange tubes are arranged in parallel with their length directions parallel to the air flow direction,

[3] An inflow side main header is arranged on the leeward side with respect to the air flow direction, and an outflow side main header is arranged on the leeward side.

An end portion of the inflow side subheader is connected in communication with the inflow side main header, an end portion of the outflow side subheader is connected in communication with the outflow side main header, and the plurality of heat exchange tube forces have their inflow side ends 3. The inflow side subheader is connected in parallel, and the outflow side end portion is connected in parallel to the outflow side subheader and arranged in parallel between the inflow side and outflow side subheaders. Heat exchanger.

[4] A pair of inflow side main headers are arranged in parallel on the leeward side with respect to the air flow direction, and a pair of outflow side main headers are arranged in parallel on the upwind side corresponding to the inflow side main header. ,

The plurality of heat exchange tube forces The inflow end is connected to the inflow subheader, and the outflow end is connected to the outflow subheader. The heat exchanger according to claim 2, wherein the heat exchanger is arranged in parallel between the inflow side and outflow side subheaders.

4. The heat exchanger according to claim 3, wherein the heat exchange tubes are provided between the corresponding inflow side subheaders and the outflow side subheaders.

[6] Non-azeotropic mixed refrigerant containing diacid-carbon is circulated through multiple heat exchange tubes and heat exchange is performed between the refrigerant and air. ,

The plurality of heat exchange tubes are arranged in parallel to form a path,

[7] Among the plurality of paths, the inflow end of the heat exchange tube in the path disposed at the upstream end is connected to the inflow header, and the heat in the path disposed at the downstream end. The outflow side end of the exchange tube is connected to the outflow side header,

Out of the two adjacent paths, the outflow side end of the heat exchange tube in the upstream arranged path and the inflow side end of the heat exchange tube in the downstream arranged path are for the coolant turn. The heat exchanger according to claim 6, wherein the heat exchanger communicates with the header.

[8] The heat exchanger according to any one of claims 1 to 7, wherein the refrigerant is composed of a mixed refrigerant with dimethyl ether containing carbon dioxide as a main component.

[9] The heat exchanger according to claim 2, wherein the heat exchange tube is provided with a plurality of refrigerant passage holes continuous in the tube length direction in parallel in the tube width direction.

[10] In the heat exchange tube, a communication hole that connects adjacent refrigerant passage holes is formed in a partition wall between adjacent refrigerant passage holes, and the refrigerant that circulates through the refrigerant passage holes passes through the communication holes. The heat exchanger according to claim 9, wherein the heat exchanger is configured to be able to go back and forth between the refrigerant passage holes.

[11] A refrigerant cooler comprising the heat exchanger according to any one of claims 1 to 10.

[12] An evaporator comprising the heat exchanger according to any one of claims 1 to 10.

[13] A refrigeration cycle in which the refrigerant compressed by the compressor is cooled by a cooler, and the cooling refrigerant is depressurized by a decompression unit and evaporated by the evaporator, and then returns to the compressor.

A refrigeration cycle, wherein at least one of the cooler and the evaporator is constituted by the heat exchange described in any one of claims 1 to 10.

[14] An automotive air conditioner comprising the refrigeration cycle according to claim 13.

[15] A heat exchange method in which a non-azeotropic mixed refrigerant containing carbon dioxide and carbon is circulated through a heat exchange path and heat is exchanged between the refrigerant and air,

16. The heat exchange method according to claim 15, wherein the refrigerant is composed of a mixed refrigerant with dimethyl ether containing carbon dioxide as a main component.