JP2003279170A - Air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning device capable of performing supercooling without using a supercooling coil. <P>SOLUTION: In a separate type air conditioning device 1 composing a refrigerating cycle with components such as a compressor 5, heat exchangers 6, 10 and an electric expansion valve 8 and having the components arranged with distributing in an outdoor unit 2 and an indoor unit 3, and having the outdoor unit 2 and the indoor unit 3 connected with pipe 4 between units, inner tube of double tube 20 is connected to coolant pipe 15 in downstream side of the outdoor heat exchanger 6 during cooling and outer tube of the double tube 20 is connected to a suction side coolant tube 16 of the compressor 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to subcooling of an air conditioner.

[0002]

2. Description of the Related Art Generally, in a separation type air conditioner, an indoor unit is placed inside a house and an outdoor unit is placed outdoors, and these two units are connected by unit piping.

FIG. 3 is a refrigerant circuit diagram of a conventional separation type air conditioner. In FIG. 3, the outdoor unit 52 includes a compressor 55, a four-way valve 56, an outdoor heat exchanger 57, and a pressure reducing device 58.
Further, the indoor unit 53 is provided with components such as an accumulator 59 and the like, and the indoor unit 53 is provided with components such as an indoor heat exchanger 61. These components are connected in an annular shape by a refrigerant pipe (including an inter-unit pipe 54) to form a refrigeration cycle. There is.

In a general household separation type air conditioner, since the length of the inter-unit pipe is about several meters, the amount of refrigerant charged in the inter-unit pipe is very small. Therefore, since the amount of the refrigerant that increases in accordance with the length of the inter-unit pipe is small, the liquid refrigerant can be sufficiently stored in the accumulator, and there is little risk that the compressor will cause liquid compression when the compressor is started.

However, in the separation type air conditioner 51 for business use or building air conditioning, both units 5
In many cases, the installation distance of 2, 53 is longer than that for household use (long piping), and the length of the inter-unit piping 54 may reach, for example, 30 meters to 100 meters, resulting in a large pressure loss. It was

Therefore, conventionally, when the separation type air conditioner 51 is operated for cooling, an air-cooling type supercooling coil 57a is set in the outdoor heat exchanger 57 of the outdoor unit 52. The supercooling coil 57a is used to supercool the refrigerant passing through the refrigerant pipe in the outdoor heat exchanger 57.

[0007]

By the way, since the conventional air-cooling type subcooling coil (not shown) is built in the outdoor heat exchanger 57 and set, the outdoor unit 52 has a dedicated design. , Was not versatile. In addition, there was a problem such as an increase in cost accompanying this.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an air conditioner capable of supercooling without specially designing an outdoor heat exchanger. .

[0009]

In order to achieve the above object, the invention according to claim 1 constitutes a refrigerating cycle with components such as a compressor, a heat exchanger and a pressure reducing device, and these components. In an air conditioner of a separation type in which the outdoor unit and the indoor unit are distributed and arranged, and the outdoor unit and the indoor unit are connected by a pipe between the units, and compressed to a refrigerant pipe on a downstream side of the outdoor heat exchanger during cooling. The suction side refrigerant pipe of the machine is provided so that heat exchange is possible.

According to a second aspect of the present invention, a refrigeration cycle is constituted by components such as a compressor, a heat exchanger and a pressure reducing device,
These components are arranged to be distributed to the outdoor unit and the indoor unit, and in the separation type air conditioner in which the outdoor unit and the indoor unit are connected by the inter-unit piping, the outdoor heat exchanger at the downstream side during cooling. The refrigerant pipe is provided so as to communicate with the inner pipe of the double pipe, and the suction-side refrigerant pipe of the compressor is communicated with the outer pipe of the double pipe.

According to a third aspect of the present invention, a refrigeration cycle is constituted by components such as a compressor, a heat exchanger and a pressure reducing device.
These components are arranged to be distributed to the outdoor unit and the indoor unit, and in the separation type air conditioner in which the outdoor unit and the indoor unit are connected by the inter-unit piping, the outdoor heat exchanger at the downstream side during cooling. The refrigerant pipe is provided so as to communicate with the outer pipe of the double pipe, and the suction side refrigerant pipe of the compressor is communicated with the inner pipe of the double pipe.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a separation type air conditioner for business use, which is composed of an outdoor unit 2, an indoor unit 3, and an inter-unit pipe 4 connecting both units 2 and 3.

The outdoor unit 2 contains a compressor 5, a four-way valve 5a, an outdoor heat exchanger 6, a fan 7, an electric expansion valve 8 and an accumulator 9, and the fan 7 is a fan. The outdoor heat exchanger 6 is rotated by the motor 7M.
It is designed to blow air into.

On the other hand, the indoor unit 3 has an indoor heat exchanger 10 and a fan 11 built therein.
1 is an indoor heat exchanger 1 rotated by a fan motor 11M
It is designed to blow to 0.

The inter-unit piping 4 is composed of an inter-unit gas pipe 13 and an inter-unit liquid pipe 14.

In FIGS. 1 and 2, a double pipe 20 for supercooling is arranged in the refrigerant pipe 15 on the downstream side of the outdoor heat exchanger 6 during cooling. The double pipe 20 is a double pipe having a substantially cylindrical inner pipe 21 and an outer pipe 22 made of copper. The outer pipe 22 has a length of several tens of centimeters around the straight inner pipe 21.
Are arranged concentrically, and both ends of the outer tube 22 are narrowed and closely fixed to the inner tube 21. 2 in the cylindrical part of the outer tube 22
A vent pipe 23 is provided, and the two vent pipes 23 communicate with each other.

One end of the inner pipe 21 of the double pipe 20 is connected to the outdoor heat exchanger 6 and the other end is connected to the electric expansion valve 8, and the outer pipe 22 of the double pipe 20 is connected between the compressor 5 and the accumulator 9. Through the refrigerant pipe 16.

Next, the operation of the air conditioner will be described.

When the four-way valve 5a of the air conditioner 1 is switched to the cooling operation side to operate the compressor 5, the refrigerant discharged from the compressor 5 is the four-way valve 5a as shown by the solid line arrow in FIG. , The outdoor heat exchanger 6, the double pipe 20, the electric expansion valve 8, the unit liquid pipe 14, the indoor heat exchanger 10, the unit gas pipe 13, the four-way valve 5a, the accumulator 9, and the double pipe 20 in this order. It In this case, the outdoor heat exchanger 6 functions as a condenser, and the indoor heat exchanger 10 functions as an evaporator, and heats the indoor air to cool the room.

During such a cooling operation, since the length of the inter-unit pipe 4 is long, the refrigerant passing through the inter-unit liquid pipe 14 does not cause pressure loss and insufficient cooling due to pressure drop. To do so, the double pipe 20 is provided in the downstream side refrigerant pipe 15 of the outdoor heat exchanger 6, and the refrigerant passing therethrough is supercooled. That is, the refrigerant passing through the refrigerant pipe 15 on the downstream side of the outdoor heat exchanger 6 in the double pipe 20 is cooled by exchanging heat with the refrigerant passing through the refrigerant pipe 16 on the suction side of the compressor 5. As a result, the refrigerant passing through the refrigerant pipe 15 is supercooled and then flows into the indoor heat exchanger 10 via the electric expansion valve 8 and the inter-unit liquid pipe 14, so that stable cooling operation can be performed.

Further, since the suction side refrigerant pipe 16 of the compressor 5 is heat-exchanged by the double pipe 20 and the temperature rises, the compressor 5
It is possible to prevent the liquid from backing up to the suction part and prevent the compressor 5 from being damaged.

The present invention can be variously modified without departing from the scope of the claims. In the present embodiment, the double pipe 20 is used as the supercooling device.
A heat exchange device other than the above may be provided separately from the outdoor heat exchanger 6. Further, in the present embodiment, the inner pipe 21 of the double pipe 20 communicates with the refrigerant pipe 15 on the downstream side of the outdoor heat exchanger 6 during cooling, and the outer pipe 22 communicates with the suction side refrigerant pipe 16 of the compressor 5. However, the suction side refrigerant pipe 16 of the compressor may be connected to the inner pipe 21, and the cooling-side downstream side refrigerant pipe 15 of the outdoor heat exchanger 6 may be connected to the outer pipe 22.

The present invention can also be applied to a multi-room type air conditioner in which a plurality of indoor units are connected to one outdoor unit by the inter-unit piping 4.

[0025]

As described above, in the air conditioner of the present invention, the double pipe is provided separately from the outdoor heat exchanger, and the refrigerant on the downstream side of the outdoor heat exchanger during cooling and the compressor. Heat exchange with the refrigerant on the suction side of. As a result, the refrigerant on the downstream side during cooling of the outdoor heat exchanger is supercooled, and the supercooled refrigerant is supplied to the indoor unit via the inter-unit pipe,
Stable cooling operation can be performed.

Further, since the double pipe is used, the refrigerant circuit can be manufactured at a low cost with a simple structure.

Further, since the suction side refrigerant pipe of the compressor is heat-exchanged by the supercooling device and its temperature rises, liquid back to the suction part of the compressor is prevented and damage to the compressor is prevented.

Also, since the double pipe is provided separately from the outdoor heat exchanger, the outdoor heat exchanger is not dedicated and can be made highly versatile.

[Brief description of drawings]

FIG. 1 is a refrigerant piping diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a sectional view of a double pipe as a supercooling device.

FIG. 3 is a refrigerant piping diagram of a conventional air conditioner.

[Explanation of symbols]

1 Separate type air conditioner 2 outdoor unit 3 indoor units Piping between 4 units 5 compressor 6 outdoor heat exchanger 8 Electric expansion valve (pressure reducing device) 10 Indoor heat exchanger 15, 16 Refrigerant tube 20 double pipe 21 inner tube 22 outer tube

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazunori Kouchi             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Hiroshi Hatsuji             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation (72) Inventor Ryo Shimotani             1 Otsuki-cho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning             Within the corporation F term (reference) 3L092 AA01 AA07 AA14 BA18 DA03

Claims (3)

[Claims] 1. A refrigeration cycle is composed of components such as a compressor, a heat exchanger, and a pressure reducing device, and these components are distributed and arranged between an outdoor unit and an indoor unit, and the outdoor unit and the indoor unit are arranged. In a separation type air conditioner connected by piping between units, an air conditioner characterized in that a suction side refrigerant pipe of a compressor is provided to a refrigerant pipe on a downstream side during cooling of the outdoor heat exchanger so that heat can be exchanged. . 2. A refrigeration cycle is configured by components such as a compressor, a heat exchanger, and a pressure reducing device, and these components are distributed and arranged between an outdoor unit and an indoor unit, and the outdoor unit and the indoor unit are arranged. In a separation type air conditioner connected by piping between units, an inner pipe of a double pipe is provided in communication with a refrigerant pipe on the downstream side during cooling of the outdoor heat exchanger, and a compressor is attached to the outer pipe of the double pipe. An air conditioner characterized by communicating with the suction side refrigerant pipe of. 3. A refrigeration cycle is constituted by components such as a compressor, a heat exchanger and a pressure reducing device, and these components are distributed and arranged between an outdoor unit and an indoor unit, and the outdoor unit and the indoor unit are arranged. In a separation type air conditioner connected by unit piping, an outer pipe of a double pipe is provided in communication with a refrigerant pipe on the downstream side of the outdoor heat exchanger during cooling, and a compressor is connected to the inner pipe of the double pipe. An air conditioner characterized by communicating with the suction side refrigerant pipe of.