JP3803282B2 - Secondary refrigerant air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve performance of a duplex tube heat exchanger. SOLUTION: A secondary refrigerant passage 4 in a clearance between positions of inner pipes 3A-3D and an outer pipe 1 is maintained constant by spacers 7 mounted with specified intervals by arranging a plurality of inner pipes 3A-3D twisted in a spiral shape respectively around an shaft center of the outer pipe 1 inside the outer pipe 1. A heat exchanging area is increased by making the inner pipes in a spiral shape of a plurality of numbers, and the heat transfer performance is increased by promoting turbulence of water flowing in the secondary refrigerant passage of the outer pipe and the inner pipes.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a primary side refrigerant and the secondary side to the double-pipe heat exchanger for exchanging heat of the coolant by using a more heat-exchanged secondary side refrigerant secondary refrigerant type air conditioner for performing air conditioning It is.
[0002]
[Prior art]
A conventional double tube heat exchanger includes an inner tube loosely fitted to an outer tube, and flows a primary side refrigerant (or secondary side refrigerant) through a gap between the outer tube and the inner tube, The secondary side refrigerant (or the primary side refrigerant) is passed through to exchange heat, and the structure is simple and can be manufactured at low cost. For example, it is used as an intermediate heat exchanger of a secondary refrigerant type air conditioner. ing.
[0003]
Figure 5 shows the conventional example of the double-pipe heat exchanger. Inside the outer tube 101, inner tube 102 having a plurality of fins 102a to enhance the heat exchange performance is projected along the axial direction for each outer peripheral portion fixed intervals (angles) are inserted. This conventional double-tube heat exchanger performs heat exchange by flowing chlorofluorocarbon, which is a primary refrigerant, in a gap 103 between an outer tube 101 and an inner tube 102, and brine, which is a secondary refrigerant, in an inner 104 of the inner tube 102. have you line.
[0004]
In FIG. 5, the inner tube 102 with the fins 102a is used for higher performance, but there are various shapes of the inner tube 102, and the inner tube with a petal shape in cross section or a twist is applied to the spiral shape. There are also examples of using special pipes with special fins.
[0005]
In addition, normal pipes are used for the inner pipe and the outer pipe, and a thread or plate is provided in the gap between the outer pipe and the inner pipe so that the refrigerant flowing through the gap between the outer pipe and the inner pipe spirals around the inner pipe. There is also an example in which a shaped member is inserted.
[0006]
Incidentally, the intermediate heat exchanger employing a double-pipe heat exchanger described above, have rows of heat exchange of the primary refrigerant and the secondary refrigerant, the secondary air conditioning lines cormorants conventional using secondary refrigerant The refrigerant air conditioner employs the form shown in FIG. 6 in order to install the intermediate heat exchanger in the outdoor unit.
[0007]
That is, the secondary refrigerant type air conditioner shown in FIG. 6 is an intermediate heat exchanger on the upper part of the outdoor unit main body 110 containing an outdoor heat exchanger and a compressor for exchanging heat with the outside air and related parts. A configuration is adopted in which an intermediate heat exchange unit box 117 containing components such as the double pipe heat exchanger 120, the pump 125, and the water tank 126 is disposed.
[0008]
And the outdoor unit 110 and each component of the heat exchange unit box 117 are connected by the connecting pipes 111 and 112, and CFCs are circulated. In the double pipe heat exchanger 120, CFC and water exchange heat to produce hot water, which is sent to the indoor unit by the water connection pipe 115 and dissipates heat in the room, and then the double pipe through the water connection pipe 116. Returned to the heat exchanger 120.
[0009]
Refrigerant connection pipe 113, 114 is a refrigerant circuit provided separately for supplying the primary refrigerant, is connected to the other indoor unit heating or cooling can line Ukoto.
[0010]
[Problems to be solved by the invention]
However, the conventional double pipe heat exchanger and the secondary refrigerant air conditioner using the same have the following problems.
[0011]
Even if a conventional double tube heat exchanger uses a finned tube or a tube with a cross section of the flower for the inner tube 102, it can only improve the performance by several tens of percent compared to a normal bare tube. Don't be. Also, the cost of the finned inner tube and the petal cross-section inner tube itself is high, and bending is difficult, so the degree of freedom is low, and the manufacturing cost of the entire double tube heat exchanger increases. there were.
[0012]
In the secondary refrigerant type air conditioner, the heat exchanger unit box 117 is installed on the same outdoor unit body 110 as the outdoor unit in which the double pipe heat exchanger 120 sends the primary refrigerant directly to the indoor unit. Thus, there is a problem that the outdoor unit main body becomes large.
[0013]
The present invention is to solve the above problems, and an object thereof is to provide an efficient storage and secondary refrigerant type air conditioner using a high-performance double-pipe heat exchanger can be miniaturized outdoor unit.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a secondary refrigerant air conditioner according to claim 1 includes an outdoor unit that cools or heats a primary refrigerant using a refrigeration heat pump cycle, and the primary side that is provided in the outdoor unit. An intermediate heat exchanger that exchanges heat between the refrigerant and the secondary side refrigerant, and an indoor unit that performs air conditioning by cooling or heating with the secondary side refrigerant, and the intermediate heat exchanger is a double pipe It comprises a heat exchanger and is arranged around the orifice part of the blower fan of the outdoor unit .
[0015]
According to the said structure, a double pipe heat exchanger can be efficiently arrange | positioned in the empty space around the orifice part of the said outdoor unit ventilation fan, and size reduction of a secondary refrigerant type air conditioner can be implement | achieved. .
[0016]
The secondary refrigerant type air conditioner according to claim 2 is the secondary refrigerant type air conditioner according to claim 1, wherein one of the primary side refrigerant and the secondary side refrigerant is used as the intermediate heat exchanger. An outer pipe to be flowed, and a plurality of inner pipes arranged in a spiral manner around the axis of the outer pipe in the outer pipe and to which the other refrigerant is fed. It is constituted by a double tube heat exchanger configured to exchange heat between one refrigerant to be sent and the other refrigerant to be sent to each of the inner pipes .
[0017]
According to the above configuration, the heat exchange area is expanded by using a plurality of inner tubes twisted in a spiral shape, and the turbulence of one refrigerant flowing between the outer tube and the inner tube is promoted. The heat exchange performance of the heavy pipe heat exchanger can be greatly improved. Therefore, by using such a double pipe heat exchanger with high heat exchange performance per unit, it can be stored sufficiently even when the space around the orifice is narrow, and the secondary refrigerant air conditioner Miniaturization can be promoted.
[0018]
The secondary refrigerant type air conditioner according to claim 3 is the secondary refrigerant type air conditioner according to claim 1, wherein one of the primary side refrigerant and the secondary side refrigerant is used as the intermediate heat exchanger. An outer pipe to be sent, a plurality of inner pipes spirally arranged around the axis of the outer pipe in the outer pipe, and the other refrigerant being sent, and the inner pipes in the outer pipe And a plurality of positioning members for turbulent flow of the other refrigerant, between one refrigerant sent to the outer pipe and the other refrigerant sent to each inner pipe And a double pipe heat exchanger in which the positioning members are arranged at predetermined intervals .
[0019]
According to the above configuration, the heat exchange area is expanded by using a plurality of inner tubes twisted in a spiral shape, and the turbulence of one refrigerant flowing between the outer tube and the inner tube is promoted. The heat exchange performance of the heavy pipe heat exchanger can be greatly improved. Furthermore, the positioning means keeps the positional relationship of the plurality of spirally twisted inner pipes constant, thereby preventing a reduction in heat exchange area due to contact between the inner pipes, and the inner pipes in the outer pipes. The bias can be eliminated to prevent the heat exchange capability from being lowered, and the refrigerant flowing between the outer tube and the inner tube can be turbulent to assist heat exchange effectively. Thereby, the heat exchange performance of a double tube heat exchanger can be improved, and it can carry out uniformly, without the heat exchange performance varying with parts. Therefore, by using such a double pipe heat exchanger with high heat exchange performance per unit, it can be stored sufficiently even when the space around the orifice is narrow, and the secondary refrigerant air conditioner Miniaturization can be promoted.
[0020]
The secondary refrigerant type air conditioner according to claim 4 is the secondary refrigerant type air conditioner according to claim 1, wherein one of the primary side refrigerant and the secondary side refrigerant is used as the intermediate heat exchanger. An outer pipe to be sent, a plurality of inner pipes spirally arranged around the axis of the outer pipe in the outer pipe, and the other refrigerant being sent, and the inner pipes in the outer pipe A plurality of positioning members constituted by linear members fitted around the inner pipes, which maintain the position of the inner pipe and turbulently flow the other refrigerant, and are fed to the outer pipe. It comprised so that heat could be exchanged between one refrigerant | coolant and the other refrigerant | coolant flowed to each said inner pipe, and comprised with the double tube heat exchanger which arrange | positioned each said positioning member for every predetermined space | interval Is.
[0021]
According to the above configuration, the heat exchange area is expanded by using a plurality of inner tubes twisted in a spiral shape, and the turbulence of one refrigerant flowing between the outer tube and the inner tube is promoted. The heat exchange performance of the heavy pipe heat exchanger can be greatly improved. Furthermore, the positioning means keeps the positional relationship of the plurality of spirally twisted inner pipes constant, thereby preventing a reduction in heat exchange area due to contact between the inner pipes, and the inner pipes in the outer pipes. The bias can be eliminated to prevent the heat exchange capability from being lowered, and the refrigerant flowing between the outer tube and the inner tube can be turbulent to assist heat exchange effectively. Thereby, the heat exchange performance of a double tube heat exchanger can be improved, and it can carry out uniformly, without the heat exchange performance varying with parts. Therefore, by using such a double pipe heat exchanger with high heat exchange performance per unit, it can be stored sufficiently even when the space around the orifice is narrow, and the secondary refrigerant air conditioner Miniaturization can be promoted. Further, the positioning member can be provided at a low cost by shaping the linear member, which can contribute to the cost reduction of the double pipe heat exchanger and the secondary refrigerant air conditioner.
[0022]
The secondary refrigerant air conditioner according to claim 5 is the secondary refrigerant air conditioner according to any one of claims 1 to 4, wherein the refrigerant is branched or split between a single pipe and a plurality of inner pipes. Of the refrigerant inlet and the refrigerant outlet of the double pipe heat exchanger to be merged, at least the refrigerant inlet is arranged so that the flow of the refrigerant branch portion is in the vertical direction .
[0023]
According to the above configuration, the refrigerant is equally distributed to each of the inner pipes by arranging the branch portion of the refrigerant inlet for dividing the single pipe into the plurality of inner pipes and supplying the refrigerant in the vertical direction. It can be supplied satisfactorily. Thereby, the performance of a double pipe heat exchanger can fully be drawn, and the performance of a secondary refrigerant type air conditioner can be improved.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a double pipe heat exchanger constituting a secondary refrigerant air conditioner according to the present invention will be described with reference to FIG. 1 and FIG.
[0025]
As shown in FIG. 1, connecting joints 2A, 2B are attached to both sides of the outer pipe 1 having a circular cross section, and the outer pipe 1 between these connecting joints 2A, 2B is respectively disposed around the axis of the outer pipe 1. A plurality (four in the figure) of inner tubes 3A to 3D that are twisted in a spiral shape and flow in the chlorofluorocarbon F, which is the primary refrigerant, are arranged. And in the outer tube | pipe 1, the secondary side refrigerant | coolant channel | path 4 which flows the water W which is a secondary side refrigerant | coolant in the clearance gap between the outer tube | pipe 1 and inner tube | pipe 3A-3D and inner tube | pipe 3A-3D is formed. Has been.
[0026]
At both ends of the outer pipe 1, there are provided an inlet branch joint 5 and an outlet branch joint 6 in which the inner pipes 3A to 3D are respectively taken out straight from the connection joints 2A and 2B and the outlets are combined into one. The inlet branch joint 5 is formed with a refrigerant inlet 3 a and the outlet branch joint 6 is formed with a refrigerant outlet 3 b. The water outlet 4b is formed for discharging water W from the secondary side refrigerant passage 4 on the connection joint 2A of the refrigerant inlet 3 a side, also the water W in the secondary side refrigerant passages 4 to the refrigerant outlet 3b side of the connection joint 2B A water inlet 4a to be supplied is formed.
[0027]
Also in the outer tube 1, there is disposed a spacer 7 is positioned member at predetermined intervals in the longitudinal direction, these spacers 7 inner tube 3A~ example front view is formed in a star shape in the recesses 3D is held, and thereby, the gap between the inner pipes 3A to 3D and the gap between the inner pipes 3A to 3D and the inner surface of the outer pipe 1 are kept constant over the entire length, and are sent to the secondary refrigerant passage 4. The water W is configured to form a turbulent flow. Therefore, the spacer 7 can prevent a decrease in heat exchange area due to contact between the inner tubes 3A to 3D and a decrease in heat exchange capability due to the bias of the inner tubes 3A to 3D in the outer tube 1.
[0028]
Also these spacers 7, metallic or inner tube 3A~3D the one thin plate 7a such as a resin which was bent to example star-shaped to form a recess for holding the causes portion 7b 's case at both ends Is provided. In forming the spacer 7, it is not always necessary to use a thin plate, but if the spacer 7 is formed, it can be formed by a simple bending process.
[0029]
As a positioning member, as shown in FIG. 4, a spacer 8 formed by winding the wire 8a around the inner pipes 3A to 3D in the directions indicated by arrows a to g and pulling the terminal ends in the h direction may be used. that holds the inner tube 3A~3D a predetermined position of the outer tube 1 by wire 8a. The spacer 8 can more easily achieve a predetermined purpose without using a processing die or the like, can be manufactured at low cost, and can supply a double-pipe heat exchanger at low cost.
[0030]
In addition, when this double tube heat exchanger 10 is used for a secondary refrigerant type air conditioner described later, the double tube heat exchanger 10 is spirally wound to be gathered into a predetermined size and used.
In the above configuration, the chlorofluorocarbon F, which is the primary refrigerant, is supplied from the refrigerant inlet 3 a to the inner pipes 3 </ b> A to 3 </ b> D via the inlet branch joint 5 and discharged from the refrigerant outlet 3 b of the outlet branch joint 6. Moreover, the water W which is a secondary side refrigerant | coolant is supplied to the secondary side refrigerant | coolant channel | path 4 from the water inlet 4a of the connection coupling 2B, is discharged | emitted from the water outlet 4b of the connection coupling 2A, and passes through the pipe wall of the inner pipes 3A-3D. exchange heat with each other with flon F through.
[0031]
According to the above embodiment, since the four inner pipes 3A to 3D are inserted in the outer pipe 1, one inner pipe having the same cross-sectional area as the total cross-sectional area of the inner pipes 3A to 3D is arranged. Compared with this, the surface area per cross-sectional area is doubled, and the heat exchange performance is also doubled.
[0032]
Moreover, since each of the inner tubes 3A to 3D has a spiral shape, the length of each of the inner tubes 3A to 3D inserted into the outer tube 1 having the same length is longer than that when a straight tube is inserted. Thus, the heat exchange area is further increased.
[0033]
Furthermore, the spiral shape of the inner pipes 3A to 3D increases the degree of contact between the water W flowing through the secondary refrigerant passage 4 between the outer pipe 1 and the inner pipes 3A to 3D and the pipe walls of the inner pipes 3A to 3D. , it facilitates heat transfer at the interface of the pipe wall and the water W.
[0034]
Furthermore, the gap between the inner pipes 3A to 3D and the gap between the inner pipes 3A to 3D and the inner surface of the outer pipe 1 are kept constant over the entire length by the spacer, and the water that is fed to the secondary refrigerant passage 4 Since a turbulent flow is formed in W, the heat exchange area does not decrease due to contact between the inner tubes 3A to 3D, and the heat exchange capacity does not decrease due to the bias of the inner tubes 3A to 3D in the outer tube 1. . Moreover, the water W is mixed by the turbulent flow formed in the water W, and the heat transfer efficiency can be improved. Therefore, the heat exchange performance of the double tube heat exchanger 10 can be greatly improved.
[0035]
Next, a method for manufacturing the double pipe heat exchanger 10 will be described.
As a method of manufacturing the double-tube heat exchanger 10, it is efficient not to assemble the inner pipes formed in a spiral shape, but to give a spiral shape in a lump after bundling the straight tubular inner pipes.
[0036]
That is, the first manufacturing method, first predetermined number after insertion of the inner tube group a bundle of straight tubular pipe 3A~3D of the outer tube 1 (four in the drawing), the ends of the inner tube bundle jig The inner tube group is twisted around the axis of the outer tube 1 through a jig.
[0037]
According to the above method, the outer tube 1 plays the role of a guide pipe that regulates the movable range of the inner tubes 3A to 3D. A spiral shape can be imparted. Therefore, a double pipe heat exchanger can be supplied at low cost.
[0038]
The second manufacturing method, the inner tube group a bundle of straight tubular pipe 3A~3D of (four in the drawing) a predetermined number, and fixed in a predetermined arrangement, the twisting of the axis around the inner tube bank added This is a method of forming the spiral shape and then inserting it into the outer tube 1.
[0039]
According to the above method, since the spiral shape is formed before the inner pipes 3A to 3D are inserted into the outer pipe 1, the processing process can be easily managed. Moreover, after attaching the spacer 7 (8) which is a positioning means of the inner pipes 3A to 3D, the inner pipe group is formed in a spiral shape so that the spacer 7 (8) has a movable range of the inner pipes 3A to 3D. Since it regulates, a spiral shape can be formed only by using a simple jig. Furthermore, since the spiral shape is imparted in a state where the inner pipes 3A to 3D can be directly operated, the management of processing becomes easy, and the manufacturing accuracy can be improved.
[0040]
In addition, as a material of the outer tube 1 and the inner tubes 3A to 3D of the double tube heat exchanger 10, a copper material excellent in thermal conductivity and workability is suitable, but a stainless material or a titanium material excellent in corrosion resistance is used. It goes without saying that the same effect can be obtained even when using. Also, a resin material can be used for the outer tube 1 that is not subjected to high pressure. Since the outer tube 1 of the resin material has a heat insulating effect to suppress heat loss due to heat dissipation, the heat insulating member that covers the outer tube 1 can be deleted or reduced. Can do.
[0041]
Moreover, in the said embodiment, although the bare pipes 3A-3D were used for the inner pipe, heat exchange performance can be further improved by using the grooved pipe | tube often used with the air heat exchanger of an air conditioner. it can.
[0042]
Furthermore, although the flow of Freon F and water W in the double-pipe heat exchanger 10 is a countercurrent flow that opposes each other, the same effect can be obtained even if they are parallel flow in the same direction depending on the purpose. The same effect can be obtained by using another refrigerant instead of Freon F and water W.
[0043]
Next, an embodiment of a secondary refrigerant heat exchanger using the double pipe heat exchanger will be described with reference to FIG.
An outdoor unit 21 of an air conditioner using a double pipe heat exchanger includes a compressor 22, an outdoor heat exchanger 23, an outdoor fan 24, an air guider 26 having an orifice 25, an electrical component 27, a four-way valve 28, a double The pipe heat exchanger 10, the water tank 31, the water pump 32, etc. are comprised. In FIG. 3, for the sake of explanation, a part of the expansion valve and the casing are omitted.
[0044]
In the outdoor unit 21, flon F, which is a primary refrigerant, is compressed by the compressor 22, passes through the four-way valve 28, enters the double-tube heat exchanger 10 from the refrigerant inlet 3 a through the refrigerant outlet 41. Then, after radiating and condensing while reaching the refrigerant outlet 3b, it passes through an expansion valve (not shown) from the refrigerant return port 42, absorbs and evaporates in the outdoor heat exchanger 23, and returns to the compressor 22 through the four-way valve 28. .
[0045]
The water W as the secondary refrigerant is circulated by the water pump 32, and the water W collected through the water return port 33 from the room enters the water inlet 4a of the double-pipe heat exchanger 10 , The water is heated to reach the outlet 4b and enters the water tank 31 as hot water. Hot water W is fed to the indoor unit through the water forward port 34 into the room from the water tank 31 through the water pump 32, returns to the heat dissipating water return port 33.
[0046]
The above is a case where warm water is produced and heated, but the flow is changed by the four-way valve 28, chlorofluorocarbon F is radiated and condensed by the outdoor heat exchanger 23, and endothermic evaporation is performed by the double pipe heat exchanger 10 to cool the cold water. It is also possible to make it.
[0047]
The present invention focused on the fact that the double-tube heat exchanger 10 requires a large space for storage by being spirally wound, but has a hollow portion at the center. On the other hand, the outdoor unit 21 requires an orifice on the leeward side of the outdoor fan 24, and the outer peripheral portion of the orifice portion 25 of the air guider 26 is a cylinder that can accommodate the double-tube heat exchanger 10 wound spirally. We focused on the fact that a large space was created.
[0048]
That is, in this embodiment, the double-pipe heat exchanger 10 is disposed and accommodated in a space generated in the outer peripheral portion of the orifice portion 25. Here, the same arrangement is possible even if a conventional double tube heat exchanger is used, but if the double tube heat exchanger 10 described in the previous embodiment is used, the unit per unit length may be used. Since the heat exchange performance is high, the length can be shortened, and the double-pipe heat exchanger 10 can be stored sufficiently even in a small space in the outer peripheral portion of the orifice portion 25. Thereby, the outdoor unit 21 of the secondary refrigerant type air conditioner using the double tube heat exchanger 10 can be reduced in size. The water pump 32 and the water tank 31 are disposed between the air guider 26 and the casing (case) of the outdoor unit 21.
[0049]
Further, in the double pipe heat exchanger 10 spirally wound in this way, a flow dividing section from the refrigerant inlet 3a which is a single path (single pipe) of the refrigerant inlet 3a to the inner pipes 3A to 3D which are a plurality of paths, If uniform distribution and merging are not performed at the merging portion from the inner pipes 3A to 3D, which are a plurality of passes, to the refrigerant outlet 3b , which is a single pass, it causes a reduction in heat exchange performance. Therefore, in this embodiment, by connecting fittings 2A to be taken out infeed or refrigerant, is 2B portion, arranged so as to be vertically lower side of the inner tube 3 A to 3 D, evenly diversion of Freon F Configured to keep on. Thereby, it is possible to fully extract the heat exchange performance, and the performance of the secondary refrigerant air conditioner using the double pipe heat exchanger 10 can be further improved.
[0050]
【The invention's effect】
As described above, according to the secondary refrigerant air conditioner of the first aspect , the double pipe heat exchanger can be efficiently arranged in the empty space around the orifice part of the outdoor unit blower fan, Miniaturization of the secondary refrigerant air conditioner can be realized.
[0051]
According to the secondary refrigerant air conditioner according to claim 2, the heat exchange area is expanded by using a plurality of inner pipes twisted in a spiral shape, and one of the inner pipes flowing between the outer pipe and the inner pipe is used. The turbulent flow of the refrigerant can be promoted, and the heat exchange performance of the double pipe heat exchanger can be greatly improved. By using a double-tube heat exchanger with high heat exchange performance per unit in this way, it can be stored well even when the space around the orifice is small, and the secondary refrigerant air conditioner can be downsized. Can be promoted.
[0052]
According to the secondary refrigerant type air conditioner according to claim 3, the heat exchange area is expanded by using a plurality of inner pipes twisted in a spiral shape, and one of the inner pipes flowing between the outer pipe and the inner pipe is used. The turbulent flow of the refrigerant can be promoted, and the heat exchange performance of the double pipe heat exchanger can be greatly improved. Furthermore, the positioning means keeps the positional relationship of the plurality of spirally twisted inner pipes constant, thereby preventing a reduction in heat exchange area due to contact between the inner pipes, and the inner pipes in the outer pipes. The bias can be eliminated to prevent the heat exchange capability from being lowered, and the refrigerant flowing between the outer tube and the inner tube can be turbulent to assist heat exchange effectively. Thereby, the heat exchange performance of a double tube heat exchanger can be improved, and it can carry out uniformly, without the heat exchange performance varying with parts. By, by using such heat exchange performance per unit high double-pipe heat exchanger, even when space around the orifice portion is small can be sufficiently accommodated, the secondary refrigerant type air conditioner Downsizing can be promoted.
[0053]
According to the secondary refrigerant air conditioner according to claim 4, the heat exchange area is expanded by using a plurality of inner pipes twisted in a spiral shape, and one of the inner pipes flowing between the outer pipe and the inner pipe is used. The turbulent flow of the refrigerant can be promoted, and the heat exchange performance of the double pipe heat exchanger can be greatly improved. Furthermore, the positioning means keeps the positional relationship of the plurality of spirally twisted inner pipes constant, thereby preventing a reduction in heat exchange area due to contact between the inner pipes, and the inner pipes in the outer pipes. The bias can be eliminated to prevent the heat exchange capability from being lowered, and the refrigerant flowing between the outer tube and the inner tube can be turbulent to assist heat exchange effectively. Thereby, the heat exchange performance of a double tube heat exchanger can be improved, and it can carry out uniformly, without the heat exchange performance varying with parts. Therefore, by using such a double pipe heat exchanger with high heat exchange performance per unit, it can be stored sufficiently even when the space around the orifice is narrow, and the secondary refrigerant air conditioner Miniaturization can be promoted. Further, the positioning member can be provided at a low cost by shaping the linear member, which can contribute to the cost reduction of the double pipe heat exchanger and the secondary refrigerant air conditioner.
[0054]
According to the secondary refrigerant type air conditioner of claim 5 , by arranging the branch portion of the refrigerant inlet for supplying the refrigerant by diverting it from the single pipe to the plurality of inner pipes, The refrigerant can be equally distributed to the pipes and supplied satisfactorily. Thereby, the performance of a double pipe heat exchanger can fully be drawn, and the performance of a secondary refrigerant type air conditioner can be improved.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing an embodiment of a double pipe heat exchanger constituting a secondary refrigerant air conditioner according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA ′ shown in FIG.
FIG. 3 is a partially exploded perspective view of an outdoor unit showing an embodiment of a secondary refrigerant air conditioner using a double pipe heat exchanger according to the present invention.
FIGS. 4A and 4B show a modification of the spacer of the double-tube heat exchanger, FIG. 4A is a front view of the spacer, and FIG. 4B is an explanatory view for explaining the procedure for forming the spacer.
FIG. 5 is a cutaway perspective view showing a conventional double tube heat exchanger.
FIG. 6 is a partially cutaway perspective view of an outdoor unit showing a conventional secondary refrigerant air conditioner.
[Explanation of symbols]
W Water F Freon 1 Outer pipe 2A, 2B Connection joint 3A-3D Inner pipe 3a Refrigerant inlet 3b Refrigerant outlet 4 Refrigerant passage 4a Water inlet 4b Water outlet 5 Inlet branch joint 6 Outlet branch joint 7 Spacer 7a Thin plate 7b Mating portion 8 Spacer 8a wire 10 double-pipe heat exchanger 21 outdoor unit 22 compressor 23 outdoor heat exchanger 24 outdoor fan 25 orifice 26 Eagaida over <br/> 31 water tank 32 water pump 33 water return port 34 water forward opening

Claims (5)

An outdoor unit that cools or heats the primary side refrigerant using a refrigeration heat pump cycle, an intermediate heat exchanger that is provided in the outdoor unit and performs heat exchange between the primary side refrigerant and the secondary side refrigerant, An indoor unit that performs air conditioning by cooling or heating with a secondary refrigerant,
The intermediate heat exchanger is constituted by a double pipe heat exchanger and is arranged around the orifice portion of the blower fan of the outdoor unit.
A secondary refrigerant type air conditioner characterized by that. It is a secondary refrigerant type air conditioner according to claim 1,
The double pipe heat exchanger is
An outer pipe through which one of the primary side refrigerant and the secondary side refrigerant is flowed;
A plurality of inner pipes arranged to be spirally twisted around the axis of the outer pipe within the outer pipe and to which the other refrigerant is flowed,
It was configured to exchange heat between one refrigerant flowed to the outer pipe and the other refrigerant flowed to each inner pipe.
A secondary refrigerant type air conditioner characterized by that. It is a secondary refrigerant type air conditioner according to claim 1,
The double pipe heat exchanger is
An outer pipe through which one of the primary side refrigerant and the secondary side refrigerant is flowed;
A plurality of inner tubes in which the other refrigerant is flowed by being spirally twisted around the axis of the outer tube in the outer tube;
A plurality of positioning members that maintain the position of each inner tube in the outer tube and turbulently flow the other refrigerant;
The refrigerant is configured to exchange heat between the one refrigerant sent to the outer pipe and the other refrigerant sent to the inner pipe, and the positioning members are arranged at predetermined intervals.
A secondary refrigerant type air conditioner characterized by that. It is a secondary refrigerant type air conditioner according to claim 1,
The double pipe heat exchanger is
An outer pipe through which one of the primary side refrigerant and the secondary side refrigerant is flowed;
A plurality of inner tubes in which the other refrigerant is flowed by being spirally twisted around the axis of the outer tube in the outer tube;
A plurality of positioning members constituted by linear members fitted around the inner pipes for maintaining the position of the inner pipes in the outer pipe and turbulently flowing the other refrigerant;
It is configured to exchange heat between one refrigerant that is flowed to the outer pipe and the other refrigerant that is flowed to each inner pipe, and the positioning members are arranged at predetermined intervals.
A secondary refrigerant type air conditioner characterized by that. Of the refrigerant inlet and the refrigerant outlet of the double pipe heat exchanger that branches or merges the refrigerant between the single pipe and the plurality of inner pipes, at least the refrigerant inlet and the flow of the refrigerant branching portion are in the vertical direction. Arranged
The secondary refrigerant type air conditioner according to any one of claims 1 to 4, wherein

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