JP2008145034A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, maintaining a stable refrigerant separation to improve the performance of an evaporator even when a difference in quantity of gas for heat transfer is caused by a difference in number of number of heat transfer pipes or blowers due to structural restrictions in the heat exchanger in which a refrigerant flows to a plurality of refrigerant path branches. <P>SOLUTION: This heat exchanger 1 having the plurality of refrigerant paths is connected to a refrigerant flow divider 6 through heat exchanger inlet pipes 111, 112, and divided flows are combined through heat exchanger outlet pipes 121, 122. Some of refrigerant is guided from refrigerant delivery pipes 81, 82 drawn from a refrigerant flow divider inlet pipe 13 on the upstream side of the refrigerant divider 6 to refrigerant path outlet heating value detectors 91, 92. In the refrigerant path outlet heating value detectors 91, 92, refrigerant which makes heat exchange with the heat exchanger outlet pipes 121, 122, returns to the side surface of the refrigerant flow divider 6 through refrigerant introduction pipes 101, 102. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger used for an air conditioner or the like.

  Conventionally, when this type of heat exchanger is used particularly for an air conditioner, a plurality of heat exchangers are arranged and arranged in parallel at regular intervals as shown in FIG. These fins are composed of a plurality of heat transfer tubes inserted at right angles to the fins at a predetermined step pitch and row pitch. When this heat exchanger is operated as an evaporator, if it is configured with a single refrigerant path, the flow resistance of the refrigerant increases and the evaporation pressure decreases, causing problems such as a reduction in refrigeration cycle performance. In order to avoid this, it is common to adopt a configuration in which the refrigerant flows through a plurality of refrigerant paths branched from one inlet.

  However, when the heat exchanger is mounted in the refrigeration cycle, there may be a case where a difference occurs in the amount of heat transfer gas by the number of heat transfer tubes or the blower due to structural restrictions. In this case, the refrigerant distribution is biased due to the change rate of the flow resistance being different from the difference in the heat exchange amount of each refrigerant path. In the refrigerant path where the refrigerant becomes insufficient due to the uneven distribution of the refrigerant, the refrigerant becomes superheated refrigerant at the outlet, and the heat transfer performance is significantly reduced. Further, in the refrigerant path through which a large amount of refrigerant flows, a large amount of non-evaporated refrigerant exists at the outlet, which may cause adverse effects such as condensation and compressor damage.

  Therefore, in order to effectively act the heat transfer area of the heat exchanger in each refrigerant path, an opening is provided so as to be able to move inside the casing of the refrigerant distributor as a means for flowing an appropriate amount of refrigerant according to each refrigerant path. It has been proposed to insert a plate, introduce the refrigerant pressure of the refrigerant path to the end of the opening plate, and move the opening plate by the refrigerant pressure difference of the refrigerant path (see, for example, Patent Document 1).

  FIG. 9 shows a conventional heat exchanger described in Patent Document 1. In FIG. In FIG. 9, the heat exchanger 1 is composed of fins 2 and heat transfer tubes 3. A plurality of heat transfer pipes are connected by a return bend 4 so as to form two refrigerant paths, and pressure pipes 51 and 52 are provided in refrigerant pipes 41 and 42 in the vicinity of the outlet of the refrigerant path (pressure detection position). The refrigerant shunt 6 is provided with an inlet portion 61 and an outlet portion 62 for the refrigerant, and pressure introducing portions 631 and 632 corresponding to the number of refrigerant paths, and includes a housing 6A having a hollow space and an opening 71 through which the refrigerant flows. The opening plate 7 is movably accommodated in the hollow space of the housing 6A. The pressure pipes 51 and 52 connected in the vicinity of the plurality of outlets are configured to communicate with the pressure introducing portions 631 and 632 of the refrigerant flow divider.

  FIG. 10 is an explanatory diagram of how the refrigerant flows in the refrigerant flow divider and the operation of the flow divider. The horizontal axis indicates the flow length of the refrigerant (corresponding to the number of heat transfer tubes), and the leftmost is the refrigerant flow divider 6. On the right side, the right side shows the position where it joins again. The vertical axis indicates the refrigerant temperature and the refrigerant pressure at that position with two refrigerant paths A and B as parameters, respectively. FIG. 10A shows a case where the refrigerant temperature and the refrigerant pressure are equal in the two refrigerant paths A and B and the refrigerant distribution is good. FIG. 10B shows characteristics in the case where drift occurs in the refrigerant flow and there is excess or deficiency of refrigerant in each refrigerant path.

First, in both FIGS. 10A and 10B, the refrigerant pressure and temperature are the same in both the refrigerant path A and the refrigerant path B in the inlet part and the outlet part of the refrigerant distributor. Next, when the distribution of the refrigerant in FIG. 10A is good, the refrigerant flows in the heat transfer tube 3 while exchanging heat with air, and the refrigerant pressure and temperature are two refrigerant paths A and B. While decreasing together, the refrigerant flows toward the refrigerant merging position which is the outlet of the heat exchanger 1. Since the outlet portion communicates in the same manner as the inlet portion, the refrigerant temperature and pressure are completely the same. On the other hand, when a drift occurs as shown in FIG. 10B, the refrigerant flow rate and the dryness of each refrigerant path are naturally set so that the refrigerant path and the outlet portion of the heat exchanger 1 have the same pressure. And it is determined by the relationship of a stable amount. At this time, if a significant drift of the refrigerant occurs, a temperature rise (overheating) occurs in the refrigerant path that is depleted due to the lack of liquid refrigerant in the vicinity of the outlet of the heat exchanger 1 (in the figure, there is a lack of liquid refrigerant in the refrigerant path A). Shown). At this time, in the refrigerant path B where liquid refrigerant is present more than necessary, a difference occurs in refrigerant pressure.

This differential pressure is introduced into the refrigerant flow divider by the pressure pipes 51 and 52 connected to the refrigerant flow divider 6 shown in FIG. 10A, and from the pressure chamber A constituted by the space 64 and the opening plate 7. Since the pressure in the other pressure chamber B is high, it acts as a force for moving the aperture plate 7 in the direction of the pressure chamber A. Due to this action, as shown in FIG. 10B, the area of the refrigerant flow opening formed by the opening plate 7 and the refrigerant outlets 621 and 622 differs in each refrigerant path. As a result, the opening area of the refrigerant path B having a sufficient refrigerant flow rate is narrowed and the flow of the refrigerant is limited. On the other hand, in the refrigerant path A where the refrigerant is depleted, the opening area is widened and a large amount of refrigerant flows. When the state of the refrigerant path is opposite, a desirable amount of refrigerant can be always supplied to each refrigerant path by the operation opposite to that described above.
JP 2002-303468 A

  However, in the conventional configuration, since the refrigerant pressure near the refrigerant path outlet is lower than the refrigerant pressure inside the refrigerant distributor, the pressure detection near the refrigerant path outlet is detected from the gap between the casing of the refrigerant distributor and the opening plate. Since the refrigerant flows toward the position, the operation due to the intended differential pressure is not performed, or the differential pressure is extremely small, so that the opening plate is caused by the frictional resistance between the casing of the refrigerant flow divider and the opening plate. However, there is a problem that the evaporator performance cannot be improved by improving the refrigerant diversion because the intended operation is not performed.

  The present invention solves the above-mentioned conventional problems, and the evaporator performance is improved by autonomously adjusting the refrigerant diversion in the refrigerant diverter according to the state of the refrigerant in each refrigerant path at the outlet of the heat exchanger. It aims at providing the heat exchanger which can aim at improvement.

  In order to solve the above-described conventional problems, the heat exchanger of the present invention is provided with a plurality of refrigerant outlet pipes for extracting a part of the refrigerant from the upstream side of the refrigerant distributor, and at each of the refrigerant path outlets. A refrigerant path outlet heat quantity detector for exchanging heat between the refrigerant guided by the refrigerant and the refrigerant flowing in the refrigerant path, and a refrigerant introduction pipe for guiding the refrigerant on the side led by the refrigerant outlet pipe of the refrigerant path outlet heat quantity detector to the refrigerant shunt The refrigerant shunt is configured to inject the refrigerant returned from the refrigerant introduction pipe along the flow path flowing into the refrigerant path, and to induce the main refrigerant flow according to the flow velocity. The refrigerant branch flow is configured to autonomously adjust according to the amount of heat per unit flow rate of the refrigerant at the pass outlet.

  This detects the amount of heat of the refrigerant at each refrigerant path outlet using a part of the refrigerant derived from the upstream side of the refrigerant distributor as a medium, and returns the refrigerant having a different flow rate to the refrigerant distributor according to the change in dryness. By injecting along the refrigerant flow path flowing into the refrigerant path and attracting the main refrigerant flow, the amount of inflow into the refrigerant path can be adjusted. Since the refrigerant is used as a medium, the intended operation is not performed in the refrigerant shunt due to the slight differential pressure, and there is no mechanically movable component. It is possible to solve the problem of not doing.

  The heat exchanger according to the present invention includes a refrigerant path obtained by dividing a refrigerant flow path into a plurality of refrigerant paths, a refrigerant flow distributor that distributes the refrigerant to each of the plurality of refrigerant paths, and a part of the refrigerant from the upstream side of the refrigerant flow distributor. A plurality of refrigerant outlet pipes, a refrigerant path outlet heat quantity detector provided at each of the refrigerant path outlets, for exchanging heat between the refrigerant guided by the refrigerant outlet pipes and the refrigerant flowing in the refrigerant path, and the refrigerant path outlet A refrigerant introduction pipe for guiding the refrigerant guided by the refrigerant lead-out pipe of the calorimeter to the refrigerant distributor, and the refrigerant diverter flows the refrigerant returned from the refrigerant introduction pipe into the refrigerant path. So that the refrigerant flow is autonomously adjusted according to the amount of heat per unit flow rate of the refrigerant at the refrigerant path outlet by injecting the main refrigerant flow according to the flow velocity. It is configured Therefore, the intended operation is not performed in the refrigerant shunt due to the high pressure refrigerant as a medium, and there is no mechanical moving part, and the intended operation is not performed due to frictional resistance. Provided a heat exchanger that can autonomously adjust the refrigerant diversion in the refrigerant diverter according to the state of the refrigerant at each refrigerant path outlet and improve the evaporator performance without any problem can do.

  A first aspect of the present invention is a refrigerant path in which a refrigerant flow path is divided into a plurality of refrigerant paths, a refrigerant flow distributor that distributes the refrigerant to each of the plurality of refrigerant paths, and a plurality of parts that derive a part of the refrigerant from the upstream side of the refrigerant flow distributor. A refrigerant outlet pipe, a refrigerant path outlet calorimeter provided at each of the refrigerant path outlets, for exchanging heat between the refrigerant guided by the refrigerant outlet pipe and the refrigerant flowing in the refrigerant path, and the refrigerant path outlet calorific value detection A refrigerant introduction pipe for guiding the refrigerant on the side led by the refrigerant outlet pipe of the condenser to the refrigerant distributor, and the inside of the refrigerant distributor is a flow for flowing the refrigerant returned from the refrigerant introduction pipe into the refrigerant path Injected along the path, and configured to induce the main refrigerant flow according to the flow velocity, configured to autonomously adjust the refrigerant shunt according to the amount of heat per unit flow rate of the refrigerant at the refrigerant path outlet By The problem is that the intended operation is not performed in the refrigerant distributor due to the slight differential pressure using the medium pressure refrigerant, and there is no mechanical moving part, and the intended operation is not performed due to frictional resistance. And a heat exchanger capable of autonomously adjusting the refrigerant diversion in the refrigerant diverter according to the state of the refrigerant at each refrigerant path outlet and capable of improving the evaporator performance. Can do.

  In the second invention, in particular, the refrigerant flow divider of the first invention is constituted by a refrigerant flow divider outlet and a refrigerant flow divider inlet, and a refrigerant path outlet calorific value is detected via a refrigerant introduction pipe at the refrigerant flow divider inlet. By providing the refrigerant injection hole for injecting the refrigerant returned from the vessel, the operation equivalent to that of the first invention can be realized while the processing of the refrigerant flow divider is easy.

  In particular, the third invention is provided with a rectifying tank upstream of the refrigerant flow divider of the first invention, the refrigerant outlet pipe is connected to the lower part of the rectifier tank, and the amount of refrigerant led out to each refrigerant outlet pipe is evenly distributed. By configuring so that the amount of refrigerant flowing into each refrigerant path outlet calorimeter is equalized, and the amount of heat per unit flow rate of refrigerant at the refrigerant path outlet is detected more accurately, equivalent to the first invention The action of can be realized more accurately.

  In the fourth invention, in particular, the refrigerant path outlet calorie detector of the first invention has a double pipe structure in which the refrigerant path outlet pipe is arranged on the inner side and the refrigerant guided from the refrigerant outlet pipe flows around. Thus, it is possible to accurately detect the amount of heat at the outlet of the refrigerant path and realize the operation of the first invention.

  In the fifth aspect of the invention, in particular, the refrigerant path outlet heat quantity detector of the first aspect of the invention is arranged so as to conduct heat by arranging a pipe for flowing the refrigerant guided from the refrigerant outlet pipe in parallel with the refrigerant path outlet pipe. As a result, the refrigerant path outlet heat quantity detector has a simple structure, and can achieve an operation equivalent to that of the first invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a heat exchanger according to a first embodiment of the present invention. In FIG. 1, the heat exchanger 1 is composed of fins 2 and heat transfer tubes 3. The plurality of heat transfer tubes are connected by a return bend 4 so as to form two refrigerant paths, and each refrigerant path is connected to the refrigerant flow divider 6 via the heat exchange inlet pipes 111 and 112 and heat exchange. The outlet pipes 121 and 122 are configured to merge. A refrigerant flow divider inlet pipe 13 is connected to the upstream side of the refrigerant flow divider 6, and refrigerant outlet pipes 81 and 82 are connected in the middle, and a part of the refrigerant is guided to the refrigerant path outlet heat quantity detectors 91 and 92. In the refrigerant path outlet heat quantity detectors 91 and 92, the refrigerant exchanged heat with the heat exchange outlet pipes 121 and 122 is configured to return to the side surface of the refrigerant distributor 6 through the refrigerant introduction pipes 101 and 102.

  FIG. 2A shows a cross-sectional view of the refrigerant path outlet heat quantity detector according to the first embodiment of the present invention, and FIG. 2B shows a partial perspective view of the refrigerant path outlet heat quantity detector. In FIG. 2A, the refrigerant flowing in from the refrigerant outlet pipe 8 is configured to exchange heat with the refrigerant flowing in the heat exchange outlet pipe 12 through the pipe wall and out of the refrigerant introduction pipe 10.

  FIG. 3 (a) shows a cross-sectional view of the refrigerant flow divider in the first embodiment of the present invention, and FIG. 3 (b) shows a perspective view when the number of refrigerant paths is increased. In FIG. 3A, in the refrigerant flow divider 6, the refrigerant flowing from the refrigerant flow divider inlet pipe 13 reaches the flow dividing space 15 through the small hole portion 14, and is substantially evenly distributed by the stirring action in the flow dividing space 15. It is distributed and flows out to the heat inlet pipes 111 and 112. The refrigerant introduction pipes 101 and 102 are arranged such that the tip portions thereof extend along the direction of the extension lines of the heat exchange pipes 111 and 112 in the shunt space 15, and the flow rate of the refrigerant injected from the tip parts is within the shunt space 15. The refrigerant is attracted to adjust the amount of the refrigerant flowing out to the heat exchange inlet pipes 111 and 112. FIG. 3B shows a perspective view when the number of refrigerant passes is 4, but the internal cross-sectional structure is the same as FIG.

  About the heat exchanger comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. FIG. 4 is an operation explanatory diagram of the heat exchanger according to the first embodiment of the present invention. FIG. 4A shows a state where the amount of refrigerant flowing into the refrigerant path is too small with respect to the heat exchange amount of the refrigerant path, resulting in overheating at the refrigerant path outlet, on the ph diagram. FIG. 4B shows that the refrigerant amount flowing into the refrigerant path is excessive with respect to the heat exchange amount of the refrigerant path, and as a result, the state where the unevaporated refrigerant remains at the refrigerant path outlet is shown. This is shown on the ph diagram.

  4A, point P1a is the superheated gas refrigerant, and shows the state of the refrigerant inside the heat exchange outlet pipe 121 in FIG. The refrigerant at the point P1a exchanges heat with the two-phase refrigerant at the point P2a that has flowed in via the refrigerant outlet pipe 81 by the refrigerant path outlet calorific value detector 91 in FIG. The two-phase refrigerant at point P2a is slightly cooled to a refrigerant state at point P3a. The refrigerant at the point P3a returns to the refrigerant distributor 6 through the refrigerant introduction pipe 101 in FIG. 1, and is injected into the diversion space 15 from the tip of the refrigerant introduction pipe 101 in FIG. Become.

In FIG. 4 (b), the point P1b is a refrigerant containing the non-evaporated liquid refrigerant, and shows the state of the refrigerant inside the heat exchange outlet pipe 122 in FIG. The refrigerant at the point P1b exchanges heat with the two-phase refrigerant at the point P2b flowing in via the refrigerant outlet pipe 82 by the refrigerant path outlet calorie detector 92 in FIG. Is large, the two-phase refrigerant at the point P2b is greatly cooled to the refrigerant state at the point P3b. The refrigerant at point P3b, which has been cooled and has decreased in dryness, is reduced in pressure to become refrigerant at point P3bD, and then returns to the refrigerant distributor 6 via the refrigerant introduction pipe 102 in FIG. 1, and the refrigerant in FIG. From the front end portion of the introduction pipe 102, it is injected into the diversion space 15 and becomes the state of the point P4b.

  Based on the difference in the state of the refrigerant at point P3a and the refrigerant at point P3bD, the flow rate of the refrigerant ejected from the tip of the refrigerant introduction tube 101 was compared with the flow rate of the refrigerant ejected from the tip of the refrigerant introduction tube 102. In this case, the former is faster than the latter. Therefore, in the flow dividing space 15 of the refrigerant flow divider 6 in FIG. 3A, the high-speed refrigerant flow ejected from the front end of the refrigerant introduction pipe 101 attracts more refrigerant in the flow dividing space 15, and heat The amount of refrigerant flowing out to the inlet / outlet pipe 111 is increased. On the contrary, the low-speed refrigerant flow ejected from the tip of the refrigerant introduction pipe 102 attracts a relatively small amount of refrigerant in the shunt space 15 and reduces the amount of refrigerant flowing out to the heat exchange inlet pipe 112. By repeating the above operation, the amount of refrigerant flowing into the two refrigerant paths can be adjusted autonomously.

  In the present embodiment, the case where the number of refrigerant paths is set to 2 has been described as an example. However, the elements of the refrigerant outlet pipe, the refrigerant path outlet heat quantity detector, and the refrigerant inlet pipe are independently provided for each refrigerant path. Since it is configured, as shown in the example shown in FIG. 3 (b), it is possible to easily deploy to a plurality of refrigerant paths.

  As described above, in the present embodiment, the amount of refrigerant heat at each refrigerant path outlet is detected using a part of the refrigerant derived from the upstream side of the refrigerant distributor as a medium, and the flow rate varies with changes in dryness. Since the refrigerant is returned to the refrigerant flow divider, injected along the refrigerant flow path flowing into each refrigerant path, and the flow of the main refrigerant is attracted, the amount of inflow into the refrigerant path can be adjusted. According to the state of the refrigerant at the path outlet, it is possible to autonomously adjust the refrigerant diversion in the refrigerant diverter, and it is possible to provide a heat exchanger capable of improving the evaporator performance.

  Further, as shown in FIG. 5, the refrigerant flow divider of the present embodiment is composed of two parts, a refrigerant flow divider outlet 6B and a refrigerant flow divider inlet 6C, and a refrigerant injection hole 6D is formed in the refrigerant flow divider inlet 6C. With the configuration in which the hole processing is performed, the operation of the present embodiment can be realized while the processing of the refrigerant flow distributor is easy.

  In addition, as shown in FIG. 6, the rectifying tank 16 is provided on the upstream side of the refrigerant flow divider of the present embodiment, and the refrigerant outlet pipes 81 and 82 are connected to the lower part of the rectifying tank 16, thereby reducing the refrigerant flow rate. By deriving the refrigerant in the liquid state staying in the lower part, the amount of refrigerant flowing into the refrigerant path outlet heat quantity detectors 91 and 92 can be equalized, and the operation of the present embodiment can be realized more accurately.

  In the refrigerant path outlet calorie detector of the present embodiment, as shown in FIG. 7, the refrigerant outlet pipe 8 and the refrigerant inlet pipe 10 are composed of one part, and the heat exchange outlet pipe is connected via the heat exchange joint 93. By configuring so as to exchange heat with 12, the refrigerant path outlet heat quantity detector can have the simple structure, but the operation of the present embodiment can be realized.

  As described above, the heat exchanger according to the present invention uses a high-pressure refrigerant as a medium, does not have a mechanical movable part, and changes the refrigerant in the refrigerant distributor according to the state of the refrigerant at the refrigerant path outlet. Since the diversion can be adjusted autonomously, even in the refrigeration cycle apparatus other than the air conditioner, there is a difference in the amount of heat transfer gas due to the number of heat transfer tubes or the blower due to structural restrictions. The present invention can be applied to a means for improving the performance of a heat exchanger having a plurality of refrigerant paths that are inevitable.

The block diagram of the heat exchanger in Embodiment 1 of this invention (A) Cross-sectional view of refrigerant path outlet heat quantity detector, (b) Perspective partial cross-sectional view of heat exchanger in Embodiment 1 of the present invention (A) Cross-sectional view of refrigerant flow divider, (b) Perspective view of refrigerant flow divider of heat exchanger in Embodiment 1 of the present invention State explanatory drawing of the heat exchanger in Embodiment 1 of this invention ((a) Inflow refrigerant | coolant understate, (b) Inflow refrigerant | coolant excess state) Sectional drawing of the refrigerant | coolant shunt of the heat exchanger in Embodiment 1 of this invention Sectional drawing of the rectification tank of the heat exchanger in Embodiment 1 of this invention The perspective view of the refrigerant | coolant path | pass exit heat amount detector of the heat exchanger in Embodiment 1 of this invention A perspective view of a conventional heat exchanger Configuration diagram of conventional heat exchanger State explanatory diagram of conventional heat exchanger

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Fin 3 Heat exchanger tube 4 Return bend 6 Refrigerant flow divider 6A Housing 6B Refrigerant flow divider outlet 6C Refrigerant flow divider inlet 6D Refrigerant injection hole 7 Opening plate 8, 81, 82 Refrigerant outlet tube 9, 91, 92 Refrigerant path outlet heat quantity detector 93 Heat exchange joint 10, 101, 102 Refrigerant introduction pipe 12, 121, 122 Heat exchange outlet pipe 13 Refrigerant distributor inlet pipe 14 Small hole part 15 Dividing space 16 Rectification tank 111 Heat exchange inlet Tube 112 Heat exchange inlet tube

Claims (5)

A refrigerant path that divides the refrigerant flow path into a plurality of parts, a refrigerant distributor that distributes the refrigerant to each of the plurality of refrigerant paths, and a plurality of refrigerant outlet pipes that derive a part of the refrigerant from the upstream side of the refrigerant distributor; A refrigerant path outlet calorific value detector that exchanges heat between the refrigerant guided by the refrigerant outlet pipe and the refrigerant flowing in the refrigerant path, and the refrigerant outlet pipe of the refrigerant path outlet heat quantity detector. A refrigerant introduction pipe that guides the refrigerant on the side led by the refrigerant to the refrigerant distributor, and the inside of the refrigerant distributor ejects the refrigerant returned from the refrigerant introduction pipe along a flow path that flows into the refrigerant path. The heat is characterized in that it is configured so as to induce the main refrigerant flow according to the flow velocity, so that the refrigerant diversion is autonomously adjusted according to the amount of heat per unit flow rate of the refrigerant at the refrigerant path outlet. Exchanger. The refrigerant diverter includes a refrigerant diverter outlet and a refrigerant diverter inlet, and the refrigerant diverter inlet is a refrigerant injection hole for injecting the refrigerant returned from the refrigerant path outlet calorimeter through the refrigerant introduction pipe. The heat exchanger according to claim 1, comprising: A rectifying tank connected to an upstream side of the refrigerant flow divider, and a refrigerant outlet pipe connected to a lower portion of the rectifying tank, wherein the refrigerant amount led out to each refrigerant outlet pipe is evenly distributed. 2. The heat exchanger according to 2. 4. The refrigerant path outlet heat quantity detector according to claim 1, wherein the refrigerant path outlet pipe has a double pipe structure in which a refrigerant path outlet pipe is arranged on the inner side and a refrigerant guided from the refrigerant outlet pipe flows around the refrigerant path outlet pipe. Heat exchanger. 4. The refrigerant path outlet heat quantity detector according to claim 1, wherein a pipe through which a refrigerant guided from the refrigerant outlet pipe flows in parallel with the refrigerant path outlet pipe and is joined so as to conduct heat. 5. Heat exchanger.