JP2004332958A - Heat exchanger of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger of an air conditioner, attaining enough supercooling when it operates as a condenser and reducing pressure loss when it operates as an evaporator to improve heat exchange performance. <P>SOLUTION: This heat exchanger of the air conditioner is composed of a main heat exchanger and an auxiliary heat exchanger connected to the main heat exchanger and disposed windward, which is the downstream side of a refrigerant flow to the main heat exchanger when it operates as a condenser and the upstream side of a refrigerant flow when it operates as an evaporator. At least part of a heat transfer pipe of the auxiliary heat exchanger is increased in pipe diameter to be larger than that of the main heat exchanger, and the number of refrigerant passages of the auxiliary heat exchanger is made smaller than the number of refrigerant passages of the main heat exchanger. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger of an air conditioner, and more particularly to a heat exchanger of an air conditioner whose structure is improved to improve heat exchange performance.
[0002]
[Prior art]
Conventionally, a heat exchanger incorporated in an air conditioner has a configuration in which an auxiliary heat exchanger is added in addition to a main heat exchanger in order to increase the heat exchange capacity.
[0003]
As shown in FIG. 6, in the conventional heat exchanger 21, the tube diameter D22 of the heat transfer tube 22 p of the main heat exchanger 22 and the tube diameter D23 of the heat transfer tube 23 p of the auxiliary heat exchanger 23 on the windward side are the same as the tube diameter D22. In order to improve the performance when the pipe diameter D23 is set and the heat exchanger 21 acts as a condenser, the number of the auxiliary heat exchangers 23 is determined based on the number of the refrigerant passages 22r of the main heat exchanger 22. The number of the refrigerant passages 23r is reduced (see Patent Documents 1 and 2).
[0004]
However, when the conventional heat exchanger 21 functions as an evaporator, the pressure loss in the pipe in the auxiliary heat exchanger 23 increases, and there is a problem that the performance as an evaporator is reduced. That is, as shown in the Mollier diagram of FIG. 2, when the pressure at the outlet of the main heat exchanger 22 is constant, the evaporation pressure is increased in the auxiliary heat exchanger 23 as shown by the dotted line, The temperature also increased, and the temperature difference between the auxiliary heat exchanger 23 and the temperature of the air that exchanges heat was reduced, and the performance of the evaporator (the amount of heat exchange) was reduced, and the performance of the evaporator was deteriorated.
[0005]
This tendency becomes remarkable when the flow rate of the variable capacity (inverter type) air conditioner is large, and there is a disadvantage that large capacity cannot be obtained. Also, when acting as a condenser, the heat transfer coefficient in the pipe is improved by reducing the diameter of the pipe, but the fin area increases with the same pipe pitch, the fin efficiency deteriorates, and the effect of reducing the diameter of the heat transfer pipe Performance cannot be sufficiently improved.
[0006]
[Patent Document 1]
JP-A-8-313049 (paragraph [0083], FIG. 4)
[0007]
[Patent Document 2]
JP-A-2000-329486 (paragraph [0040], FIG. 2)
[0008]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described circumstances, and provides sufficient supercooling when acting as a condenser, reduces pressure loss when acting as an evaporator, and improves heat exchange performance. It is an object of the present invention to provide a heat exchanger of an air conditioner that can achieve the above.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to one aspect of the present invention, there is provided a main heat exchanger having a plurality of heat transfer tubes penetrating and penetrating a plurality of heat transfer fins arranged at a predetermined fin pitch. Having a plurality of heat transfer tubes which are communicated with the main heat exchanger and are provided on the windward side thereof, and which thermally fit and penetrate a plurality of heat transfer fins arranged at a predetermined fin pitch, as a condenser An auxiliary heat exchanger that is downstream of the refrigerant flow with respect to the main heat exchanger when acting and upstream of the refrigerant flow when acting as an evaporator; The diameter of at least a part of the heat transfer tubes of the heat exchanger is made larger than the diameter of the main heat exchanger, and the number of refrigerant flow paths of the auxiliary heat exchanger is smaller than the number of refrigerant flow paths of the main heat exchanger. A heat exchanger for an air conditioner is provided. This realizes a heat exchanger of an air conditioner in which sufficient supercooling can be obtained when functioning as a condenser, and pressure loss can be reduced when functioning as an evaporator, thereby improving heat exchange performance. You.
[0010]
According to another aspect of the present invention, a main heat exchanger section having a plurality of heat transfer tubes penetrating and penetrating the fin main sections of a plurality of heat transfer fins arranged at a predetermined fin pitch, The sub-portion of the heat transfer fin, which is provided on the windward side of the main heat exchanger and is separated from the main portion of the fin by the heat transfer prevention means provided in the longitudinal direction of the heat transfer fin, heat conductively. Sub-heat that has a plurality of fitted and penetrated heat transfer tubes, is downstream of the refrigerant flow with respect to the main heat exchanger when acting as a condenser, and is upstream of the refrigerant flow when acting as an evaporator. In the heat exchanger of the air conditioner including the heat exchanger, the diameter of at least a part of the heat transfer tube of the sub heat exchanger is made larger than the diameter of the main heat exchanger, and The number of refrigerant passages in the heat exchanger is smaller than that in the main heat exchanger. The heat exchanger of an air conditioner and is provided. As a result, sufficient supercooling can be obtained when acting as a condenser, pressure loss can be reduced when acting as an evaporator, and heat exchange performance can be improved. As a result, a heat exchanger of an air conditioner that facilitates the operation of inserting a heat transfer tube when manufacturing the heat exchanger is realized.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a heat exchanger of an air conditioner according to the present invention will be described with reference to the accompanying drawings.
[0012]
FIG. 1 is a side view of a first embodiment of a heat exchanger of an air conditioner according to the present invention.
[0013]
As shown in FIG. 1, the heat exchanger 1 of the air conditioner according to the first embodiment is provided on the main heat exchanger 2 and on the windward side of the main heat exchanger 2 and serves as a condenser. The auxiliary heat exchanger 3 is located downstream of the refrigerant flow and upstream of the refrigerant flow when acting as an evaporator.
[0014]
The main heat exchanger 2 is composed of a plurality of heat transfer fins 2f arranged at a predetermined fin pitch, and a heat transfer tube 2p that heat-fits and penetrates the heat transfer fins 2f, and the auxiliary heat exchanger 3 And a plurality of heat transfer fins 3f arranged at a predetermined fin pitch, and a heat transfer tube 3p which fits and penetrates the heat transfer fins 3f in a heat conductive manner. Auxiliary heat exchanger 3 is larger than the pipe diameter D ₂ of at least a portion of the tube diameter D3 of the main heat exchanger 2 the heat transfer tubes 3p of the heat transfer tube 3p (D _{3> D 2),} further, The number of refrigerant channels through which the refrigerant flows through the auxiliary heat exchanger 3 is set to be smaller than the number of refrigerant channels of the main heat exchanger 2.
[0015]
For example, the refrigerant flow path 2r of the main heat exchanger 2 is composed of two systems, upper and lower, and the refrigerant flow path 3r of the auxiliary heat exchanger 3 is composed of one system. The fin pitch of the heat transfer fins 3f of the auxiliary heat exchanger 3 is set larger than the fin pitch of the heat transfer fins 2f of the main heat exchanger 2.
[0016]
As shown in FIG. 5, the heat exchanger 1 of the air conditioner of the first embodiment has a refrigeration formed by sequentially connecting a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, and a pressure reducing device 14. It is installed between the four-way switching valve 12 of the cycle 10 and the pressure reducing device 14, and is used as an indoor heat exchanger.
[0017]
Since this heat exchanger has the above-described structure, during the cooling operation in which the heat exchanger 1 acts as an evaporator, the transfer of the auxiliary heat exchanger 3 is performed in the evaporation process of the Mollier diagram shown by the solid line in FIG. at least a part of the tube diameter D3 of the heat pipe 3p is greater than the pipe diameter D ₂ of the main heat exchanger 2, it is possible to suppress the pressure loss inside the auxiliary heat exchanger 3, when allowed to act as an evaporator, There is no temperature gradient in the temperature of the heat exchanger 1, and in the auxiliary heat exchanger 3, as shown by the solid line in the Mollier diagram, the evaporation pressure hardly increases, and the evaporation temperature does not increase. A sufficient temperature difference between the heat exchanger 3 and the temperature of the air to be heat-exchanged can be obtained, and the performance (heat exchange amount) of the evaporator can be improved.
[0018]
Further, during the heating operation in which the heat exchanger 1 acts as a condenser, the heat transfer coefficient in the heat transfer tube is slightly reduced, but the fin efficiency is improved, so that the same condensation performance as the conventional one is obtained, and the performance of the evaporator is improved. In combination with the improvement of the heat exchanger, the performance of the heat exchanger is improved overall.
[0019]
Next, a second embodiment of the heat exchanger of the air conditioner according to the present invention will be described.
[0020]
In the second embodiment, while the diameter of the heat transfer tube of the auxiliary heat exchanger is the same as that of the first embodiment, the tube diameter is partially changed, and the auxiliary heat exchanger includes a plurality of auxiliary heat exchangers. ing.
[0021]
For example, as shown in FIG. 3, in the heat exchanger 1A of the second embodiment, the auxiliary heat exchanger 3A includes a plurality of, for example, two auxiliary heat exchangers 31A and 32A, and the heat transfer tubes 3Ap ₁ , When the tube diameters DA ₃₁ and DA _{32 of} 3Ap ₂ act as evaporators, the tube diameter DA ₃₁ of the heat transfer tube 3Ap _{1 that} is on the downstream side of the refrigerant flow is the tube of the heat transfer tube 3Ap _{2 that} is on the upstream side of the refrigerant flow. It is larger than the diameter _{DA 32.} Therefore, when the tube diameter DB ₂ of the heat transfer tube 3Ap of the main heat exchanger _2A, the _{DB 2 <DA 31> DA 32} .
[0022]
Thereby, when acting as a condenser, the performance can be further improved, and since the auxiliary heat exchanger is divided into a plurality, the installability in the indoor unit main body is improved. Note that the auxiliary heat exchanger does not necessarily need to be divided, and in one auxiliary heat exchanger, the diameter of the heat transfer tube downstream of the refrigerant flow when acting as an evaporator is changed to the upstream side of the refrigerant flow. May be larger than the diameter of the heat transfer tube. This can further improve the performance when functioning as a condenser.
[0023]
A third embodiment of the heat exchanger for an air conditioner according to the present invention will be described.
[0024]
In the third embodiment, the auxiliary heat exchanger and the main heat exchanger are formed by separate heat transfer fins in the first embodiment, whereas the sub heat exchanger section and the main heat exchanger section are formed. Are formed by integral heat transfer fins.
[0025]
For example, as shown in FIG. 4, a main heat exchanger portion 2B having a plurality of heat transfer tubes 2Bp that the fin main portion 2BF ₁ of a plurality of heat transfer fins 2BF heat conductive fit through, the main heat exchanger vessel portion 2B provided in communication and the windward side, the fins of the fin main portion 2BF ₁ and the heat transfer fins 2BF of heat transfer fins 2BF spaced by slits St as the heat transfer prevention means provided in the longitudinal direction sub part 3BF ₁ a has a plurality of heat transfer tubes 3Bp _1, 3Bp ₂ to heat transfer to fit through, become the downstream side of the coolant when acting as a condenser, the refrigerant flow when acting as an evaporator And a sub heat exchanger section 3B on the upstream side. At least a part of the heat transfer tubes 3Bp ₁ and 3Bp ₂ of the sub heat exchanger unit 3B, for example, the tube diameter DB ₃₁ is larger than the tube diameter DB ₂ of the main heat exchanger unit 2Bp. tube diameter _DB of the heat transfer tube 3Bp ₂ on the downstream side of the flow ₃₂ is smaller than the tube diameter _{DB 32} of the heat transfer tube 3Bp ₁ on the upstream side, further, the coolant flow path of the auxiliary heat exchanger unit 3B 3Br Is smaller than the number of the refrigerant channels 2Br of the main heat exchanger 2B. Therefore, when the tube diameter DB ₂ of the heat transfer tube 3Bp of the main heat exchanger _2B, the _{DB 2 <DB 31> DB 32} .
[0026]
Accordingly, when the heat exchanger works as an evaporator, the performance can be further improved, and since the integrated heat transfer fins are used, the work of inserting the heat transfer tubes at the time of manufacturing the heat exchanger is facilitated.
[0027]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the heat exchanger of the air conditioner which concerns on this invention, sufficient supercooling is taken when it acts as a condenser, and the pressure loss is reduced when it acts as an evaporator, and the heat exchange performance is improved. The heat exchanger of the air conditioner which can achieve the above can be provided.
[Brief description of the drawings]
FIG. 1 is a side view of a first embodiment of a heat exchanger of an air conditioner according to the present invention.
FIG. 2 is a Mollier diagram when the heat exchanger of the air conditioner according to the present invention functions as an evaporator.
FIG. 3 is a side view of a second embodiment of the heat exchanger of the air conditioner according to the present invention.
FIG. 4 is a side view of a third embodiment of the heat exchanger of the air conditioner according to the present invention.
FIG. 5 is a refrigeration cycle diagram incorporating the heat exchanger of the air conditioner according to the present invention.
FIG. 6 is a side view of a heat exchanger of a conventional air conditioner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat exchanger of an air conditioner, 2 ... Main heat exchanger, 2f ... Heat transfer fin, 2p ... Heat transfer tube, 3 ... Auxiliary heat exchanger, 3f ... Heat transfer fin, 3p ... Heat transfer tube.

Claims (4)

A main heat exchanger having a plurality of heat transfer tubes penetrating and penetrating a plurality of heat transfer fins arranged at a predetermined fin pitch, and provided on the windward side thereof and communicated with the main heat exchanger; It has a plurality of heat transfer tubes penetrating a plurality of heat transfer fins arranged at a predetermined fin pitch in a heat conductive manner, and is located downstream of the refrigerant flow with respect to the main heat exchanger when acting as a condenser. In an air conditioner heat exchanger comprising an auxiliary heat exchanger that is upstream of a refrigerant flow when acting as an evaporator, at least a part of the heat transfer tubes of the auxiliary heat exchanger has a main heat exchange pipe diameter. A heat exchanger for an air conditioner, wherein the number of refrigerant passages of the auxiliary heat exchanger is smaller than the number of refrigerant passages of the main heat exchanger, while being larger than a tube diameter of the heat exchanger. The auxiliary heat exchanger, wherein when acting as an evaporator, the tube diameter of the heat transfer tube downstream of the refrigerant flow is larger than the tube diameter of the heat transfer tube upstream of the refrigerant flow. 1. Air conditioner heat exchanger. The auxiliary heat exchanger is formed by connecting a plurality of auxiliary heat exchangers, and the diameter of the heat transfer tube of the auxiliary heat exchanger that is downstream of the refrigerant flow when acting as an evaporator is upstream of the refrigerant flow. The heat exchanger for an air conditioner according to claim 1, wherein a diameter of the heat transfer tube of the auxiliary heat exchanger on the side is larger than a diameter of the heat exchanger tube. A main heat exchanger section having a plurality of heat transfer tubes penetrating and penetrating the fin main sections of the plurality of heat transfer fins arranged at a predetermined fin pitch, and being communicated with and connected to the main heat exchanger section; A plurality of heat transfer tubes that are provided on the windward side and penetrate through the heat transfer fins and the sub portions of the heat transfer fins separated by the heat transfer prevention means provided in the longitudinal direction of the heat transfer fins. An air conditioner comprising a sub-heat exchanger portion that is downstream of the refrigerant flow with respect to the main heat exchanger when acting as a condenser and upstream of the refrigerant flow when acting as an evaporator. In the heat exchanger, the diameter of at least a part of the heat transfer tubes of the sub heat exchanger section is set to be larger than the diameter of the main heat exchanger section, and the number of refrigerant flow paths of the sub heat exchanger section is set to Heat exchange of an air conditioner characterized by having less than the number of refrigerant channels in the exchanger section .

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