JPH11118296A - Refrigeration cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of turbulence of coolant by coupling an expansion valve with a contraction tube having the other end coupled with one end of a branch tube coupled with a capillary tube and providing the branch tube with a gas-liquid mixing part thereby making smooth the refrigerant flow without decreasing the current velocity of refrigerant after it is restricted by the expansion valve. SOLUTION: A compressor 10, a four-way valve 20, an expansion valve 40, capillary tubes 41, 42 and an evaporator 50 are disposed in an outdoor unit A and a condenser 30 is disposed in an outdoor unit B and then they coupled through piping into a closed circuit thus constituting a refrigeration cycle unit. The evaporator 50 is shunted to two passages which are provided with capillary tubes 41, 42 having different restriction quantity. Both capillary tubes 41, 42 are coupled with a branch pipe 60 having a gas-liquid mixing part and the expansion valve 40 is coupled with the branch pipe 60 through a contraction tube 70 having inside diameter smaller than that of the outlet tube of the expansion valve 40. According to the arrangement, shunting to respective capillary tubes 41, 42 is carried out as specified regardless of turbulence of refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle apparatus in which an evaporator is divided into a plurality of paths, and a capillary tube as an auxiliary expansion device is provided corresponding to each path. The present invention relates to a refrigeration cycle device used.

[0002]

2. Description of the Related Art As a conventional refrigeration cycle apparatus, there has been proposed a refrigerating cycle apparatus in which an evaporator is divided into a plurality of paths and a capillary tube as an auxiliary throttle device is provided corresponding to each path. In such a refrigeration cycle apparatus, the expansion device is configured by an expansion valve and respective capillary tubes, but the expansion valve and the capillary tube block are connected by using a pipe having the same inner diameter as a liquid side pipe used in another part. doing.

[0003]

However, in the above-described apparatus, the refrigerant once throttled by the expansion valve causes a turbulent flow state in the pipe leading to the capillary tube. The generation of the turbulence increases the noise of the refrigerant flowing through the pipe, and causes a noise problem. In addition, the occurrence of the turbulent flow causes a problem that the branch flow to each capillary tube is not a predetermined branch flow. Particularly in recent years, from the viewpoint of environmental destruction prevention, H
The use of an HFC-based refrigerant instead of the CFC-based refrigerant is being studied, but the HFC-based refrigerant has a higher density than the HCFC-based refrigerant. Therefore, if an HFC-based refrigerant is used in a refrigeration cycle device having a pipe diameter equivalent to that of a refrigeration cycle using an HCFC-based refrigerant, the above problem becomes even more serious.

Accordingly, an object of the present invention is to pay particular attention to the connection between the expansion valve and the capillary tube, and to make each of the divided flows have a predetermined dividing ratio.

[0005]

According to a first aspect of the present invention, there is provided a refrigeration cycle apparatus in which a compressor, a condenser, a decompression device, and an evaporator are connected in a ring shape, and the evaporator is divided into a plurality of paths. In the refrigeration cycle apparatus, wherein the pressure reducing device is configured by an expansion valve and a plurality of capillary tubes connected in parallel, the expansion valve and the capillary tube are connected via a flow reduction pipe. The refrigeration cycle device of the present invention according to claim 2 is configured such that a compressor, a condenser, a decompression device, and an evaporator are connected in a ring shape, the evaporator is divided into a plurality of paths, and the decompression device is provided with an expansion valve. In a refrigeration cycle apparatus including a plurality of parallel-connected capillary tubes, the expansion valve is connected to a contraction tube, the contraction tube is connected to one end of a branch tube, and the other end of the branch tube is connected to the other end of the branch tube. A capillary tube is connected, and the branch pipe has a gas-liquid mixing section. A refrigeration cycle apparatus according to a third aspect of the present invention is the refrigeration cycle apparatus according to the second aspect, wherein the connection between the branch pipe and the contraction pipe is performed by connecting the contraction pipe to the contraction pipe of the branch pipe. It is characterized by being inserted into the mouth. A refrigeration cycle apparatus according to a fourth aspect of the present invention is the refrigeration cycle apparatus according to the third aspect, wherein the branch pipe includes a convex branch part at a position facing an opening of the contraction pipe, The capillary tube is connected such that the opening of the capillary tube is located on the side of the branch portion.
The refrigeration cycle apparatus according to the fifth aspect of the present invention provides the refrigeration cycle apparatus according to the first aspect.
5. The refrigeration cycle apparatus according to claim 1, wherein an inner diameter of the contraction pipe is equal to or less than an inner diameter of an outlet pipe of the expansion valve. According to a sixth aspect of the present invention, there is provided the refrigeration cycle apparatus according to any one of the first to fifth aspects, wherein the capillary tubes have different amounts of contraction and are distinguishable in appearance. It is characterized by. A refrigeration cycle apparatus according to a seventh aspect of the present invention is the refrigeration cycle apparatus according to the sixth aspect, wherein the capillary tubes have substantially the same inner diameter and different outer diameters. The refrigeration cycle apparatus of the present invention according to claim 8 is the refrigeration cycle apparatus according to claim 6,
The capillary tubes have different inner diameters. A refrigeration cycle apparatus according to a ninth aspect of the present invention is the refrigeration cycle apparatus according to any one of the first to eighth aspects, wherein an HFC-based refrigerant is used as a refrigerant. The branch pipe of the present invention according to claim 10 has a contraction pipe connection port into which a contraction pipe can be inserted at one end, and has a convex branch portion at a position facing the contraction pipe connection port, A plurality of capillary tube connection ports into which a capillary tube can be inserted is provided on a side portion of the branch portion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigeration cycle apparatus according to a first embodiment of the present invention is one in which an expansion valve and a capillary tube are connected via a contraction tube. As described above, in the present embodiment, the pipe between the expansion valve and the capillary tube is a contraction pipe, so that the flow of the refrigerant can be made smooth without reducing the flow velocity of the refrigerant after being throttled by the expansion valve. Further, generation of turbulent refrigerant flow can be prevented. Therefore,
The branch flow to each of the capillary tubes can be performed in a predetermined manner without being disturbed by the turbulent flow of the refrigerant. Further, the noise of the refrigerant flowing through the pipe caused by the turbulence can be reduced.

In a refrigeration cycle apparatus according to a second embodiment of the present invention, an expansion valve is connected to a contraction pipe, the contraction pipe is connected to one end of a branch pipe, and each capillary is connected to the other end of the branch pipe. The tube is connected, and the branch pipe has a gas-liquid mixing section. As described above, in the present embodiment, by connecting the expansion valve and the capillary tube using the contraction pipe, the refrigerant flow is smoothly performed without reducing the flow velocity of the refrigerant after being throttled by the expansion valve. be able to. In addition, the branch pipe has one end connected to the contraction pipe and the other end connected to each capillary tube, and has a gas-liquid mixing section, so that the gas-liquid refrigerant flowing from the contraction pipe can be mixed with the liquid-liquid. Since the mixture is guided to the capillary tube after mixing in the section, the flow dividing performance can be improved. Therefore, the divided flows to the respective capillary tubes can be performed in a predetermined manner without being disturbed by the turbulent flow of the refrigerant. In addition, it is possible to prevent the noise of the refrigerant flowing through the piping caused by the turbulent flow.

According to a third embodiment of the present invention, in the second embodiment, the connection between the branch pipe and the contraction pipe is established by inserting the contraction pipe into the contraction pipe connection port of the branch pipe. Is what you do. As described above, in the present embodiment, since the contraction pipe is inserted into the inside of the branch pipe, the flow of the refrigerant after being throttled by the expansion valve is smoothly reduced without decreasing the flow velocity until reaching the inside of the branch pipe. It can be carried out. Therefore, the generation of turbulence can be prevented to a maximum without lowering the flow velocity until immediately before the gas-liquid mixing section in the branch pipe.

According to a fourth embodiment of the present invention, in the third embodiment, the branch pipe has a convex branch at a position facing the opening of the contraction pipe. The capillary tube is connected so that the opening of the capillary tube is located at the portion. As described above, in the present embodiment, by providing such a branch portion, the flow dividing performance of the refrigerant introduced from the contraction tube can be improved, and the refrigerant can be smoothly divided into the respective capillary tubes.

A fifth embodiment of the present invention differs from the first to fourth embodiments in that the inner diameter of the contraction pipe is smaller than the inner diameter of the outlet pipe of the expansion valve. By setting the diameter of the contraction pipe to be equal to or less than the inner diameter of the outlet pipe of the expansion valve, the flow can be smoothly performed without lowering the flow velocity of the refrigerant throttled by the expansion valve.

According to a sixth embodiment of the present invention, in the first to fifth embodiments, the capillary tubes have different amounts of restriction and are distinguishable in appearance. In this way, by making the respective throttle amounts different, it is possible to optimally set the evaporation performance in each of the branch pipes of the evaporator, and to make it possible to distinguish the external appearance, thereby preventing a connection error when connecting the pipes. be able to.

A seventh embodiment of the present invention is different from the sixth embodiment in that the inner diameters of the capillary tubes are made substantially the same and the outer diameters are made different. By differentiating the outer diameter in this way, it is possible to distinguish the appearance.

An eighth embodiment of the present invention differs from the sixth embodiment in that the inside diameters of the capillary tubes are different. By making the inner diameters different in this way, the respective aperture amounts can be made different.

In a ninth embodiment of the present invention, an HFC-based refrigerant is used as the refrigerant in the first to eighth embodiments. As described above, when the HFC-based refrigerant is used as the refrigerant, the above effect is more remarkable because the density is higher than that of the HCFC-based refrigerant.

The branch pipe according to the tenth embodiment of the present invention has, at one end, a contraction pipe connection port into which a contraction pipe can be inserted. In this way, by inserting the side of the contraction pipe so as to be connectable, it is possible to smoothly flow the refrigerant to the inside of the distribution pipe without lowering the flow velocity. Further, in the present embodiment, by having the convex branch portion at a position facing the contraction pipe connection port, the flow dividing performance of the refrigerant introduced from the contraction pipe can be improved. Further, in the present embodiment, by having a capillary tube connection port into which a capillary tube can be inserted at a side portion of the branch portion, the flow can be smoothly divided into the respective capillary tubes.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigeration cycle apparatus according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigeration cycle diagram of an air conditioner for explaining the embodiment. As shown in the figure, the compressor 10, the four-way valve 20, the condenser 3
0, the expansion valve 40, the capillary tubes 41 and 42, and the evaporator 50, which constitute the expansion device, are connected in a ring shape through respective pipes. Here, the compressor 10, the four-way valve 2
The expansion valve 40, the capillary tubes 41 and 42, and the evaporator 50 are provided in the outdoor unit A, and the condenser 30 is provided in the indoor unit B. Here, the evaporator 50 is divided into two paths. A capillary tube 41 and a capillary tube 42 are provided in the pipes connected to the respective paths. The capillary tube 41 and the capillary tube 42 are connected to a branch pipe 60, and the expansion valve 40 and the branch pipe 60 are connected by a contraction pipe 70. Here, a pipe whose inner diameter is equal to or smaller than the inner diameter of the outlet pipe of the expansion valve 40 is used as the contraction pipe 70. Also, the capillary tubes 41 and 42 have different amounts of throttle. This aperture is
It can be performed with different inner diameters, but it is also possible with different lengths. Further, it is preferable that the respective capillary tubes 41 and 42 have, for example, different outer diameters so as to be distinguishable in appearance. As the refrigerant used in the present embodiment, an HCFC-based refrigerant can be used. However, when an HFC-based refrigerant is used, the effect is even higher.

FIG. 2 is a sectional view for explaining a schematic configuration of the branch pipe 60 in the embodiment. As shown in the figure, the branch pipe 60 has a contraction pipe connection port 61 for connecting a contraction pipe 70 at one end thereof, and a capillary tube for connecting the capillary tubes 41 and 42 to the other end. Tube connection ports 62 and 63 are provided. Further, a protruding branch portion 64 is provided at a position facing the contraction pipe connection port 61. Further, around the branch portion 64, the gas-liquid mixing portion 6 is provided.
5 are formed. The contraction tube 70 and the capillary tubes 41 and 42 are connected by inserting them into the contraction tube connection port 61 or the capillary tube connection ports 62 and 63, respectively.

Hereinafter, the flow and state of the refrigerant in the above embodiment will be briefly described. First, the high-pressure gas refrigerant compressed by the compressor 10 is guided to the condenser 30 via the four-way valve 20. The high-pressure gas refrigerant is condensed while passing through the condenser 30, and becomes a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is turned into a low-pressure gas-liquid two-phase refrigerant by the expansion valve 40 and flows to the contraction pipe 70. At this time, the contraction pipe 70
Uses a pipe whose inner diameter is smaller than the inner diameter of the outlet pipe of the expansion valve 40, so that the flow rate of the gas-liquid two-phase refrigerant does not decrease when flowing through the contraction pipe 70. Does not occur. Therefore, the gas-liquid two-phase refrigerant smoothly flows in the contraction pipe 70 in this way, and the branch pipe 60
All the way to the inside. The refrigerant introduced into the branch pipe 60 is mixed with the gas and liquid by the gas-liquid mixing section 65, and at the same time, is split by the branch section 64 and flows into the respective capillary tubes 41 and 42. As described above, the refrigerant after passing through the expansion valve 40 is supplied to each of the capillary tubes 4 in a state in which turbulence is hardly generated due to expansion of the pipe.
Since the refrigerant is guided to 1, 42, the refrigerant can flow through the respective capillary tubes 41, 42 at a predetermined split ratio.

[0019]

As described above, the refrigeration cycle apparatus of the present invention can make the flow of the refrigerant smooth without reducing the flow velocity of the refrigerant after being throttled by the expansion valve, and can prevent the generation of turbulent flow of the refrigerant. . Therefore, the divided flows to the respective capillary tubes are not disturbed by the turbulent flow of the refrigerant,
It can be performed as prescribed. In addition, it is possible to prevent the noise of the refrigerant flowing through the piping caused by the turbulent flow.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle apparatus as one embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of a branch pipe of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Compressor 20 Four-way valve 30 Condenser 40 Expansion valve 41 Capillary tube 42 Capillary tube 50 Evaporator 60 Branch pipe 61 Contraction pipe connection port 62 Capillary tube connection port 63 Capillary tube connection port 64 Branch section 65 Gas-liquid mixing section 70 Contraction Flow tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Shoichi Yokoyama 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Masami Masahara 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A capillary tube in which a compressor, a condenser, a decompression device, and an evaporator are respectively connected in a ring shape, the evaporator is divided into a plurality of paths, and the decompression device is connected to an expansion valve and a plurality of parallel-connected capillary tubes. Wherein the expansion valve and the capillary tube are connected via a contraction tube. 2. A capillary tube in which a compressor, a condenser, a decompression device, and an evaporator are respectively connected in a ring shape, the evaporator is divided into a plurality of paths, and the decompression device is connected to an expansion valve and a plurality of parallel-connected capillary tubes. Wherein the expansion valve is connected to a contraction tube, the contraction tube is connected to one end of a branch tube, and each of the capillary tubes is connected to the other end of the branch tube. A refrigeration cycle apparatus having a gas-liquid mixing section in a pipe. 3. The refrigeration according to claim 2, wherein the connection between the branch pipe and the contraction pipe is performed by inserting the contraction pipe into a contraction pipe connection port of the branch pipe. Cycle equipment. 4. The branch pipe includes a convex branch at a position facing the opening of the contraction pipe, and the capillary is positioned such that an opening of the capillary tube is positioned on a side of the branch. The refrigeration cycle apparatus according to claim 3, wherein a tube is connected. 5. The refrigeration cycle apparatus according to claim 1, wherein an inner diameter of the contraction pipe is smaller than an inner diameter of an outlet pipe of the expansion valve. 6. The refrigeration cycle apparatus according to claim 1, wherein each of the capillary tubes has a different throttle amount and is distinguishable in appearance. 7. The refrigeration cycle apparatus according to claim 6, wherein the capillary tubes have substantially the same inner diameter and different outer diameters. 8. The refrigeration cycle apparatus according to claim 6, wherein the capillary tubes have different inner diameters. 9. The refrigeration cycle apparatus according to claim 1, wherein an HFC-based refrigerant is used as the refrigerant. 10. A contraction pipe connection port into which a contraction pipe can be inserted at one end, and a convex branch portion at a position facing the contraction tube connection port, and a side portion of the branch portion. A branch pipe having a plurality of capillary tube connection ports into which a capillary tube can be inserted.