JP2001116406A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sure removal of moisture as well as workability by contriving the mounting position of a dryer since a pipeline connecting an indoor machine to an outdoor machine should be removed once upon transferring a domestic room air conditioner whereby the leakage of moisture can be estimated at every times. SOLUTION: The air conditioner can be realized by a method wherein a moisture removing device, constituted of a drier, in which a dying agent is sealed, and a refrigerant flow rate control device, which are connected in series to constitute one unit, is mounted on a pipeline between the outdoor machine and the indoor machine, so as to be in parallel to an indoor heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applied to a case where it is necessary to add a desiccant into a refrigeration cycle for removing moisture when an air conditioner is relocated. In particular, the present invention relates to an air conditioner using an HFC-based refrigerant as a refrigerant and using a hydrolyzable refrigeration oil such as an ester as a refrigeration oil.

[0002]

2. Description of the Related Art Conventionally, the refrigerant of a home room air conditioner is R
22, the refrigerating machine oil uses mineral oil, which is a system which is relatively strong against moisture, and at present, it is almost unnecessary to add a desiccant for removing moisture during the cycle.

[0003] However, from the viewpoint of global environmental protection, the refrigerant for air conditioning is shifting from the conventional HCFC type R22 to the HFC type. Since the refrigerating machine oil does not sufficiently dissolve in the HFC-based refrigerant due to the different polarization state of the molecule from the HCFC-based refrigerant, conventional mineral oil cannot be used as the refrigerating machine oil.

Therefore, artificial synthetic oils such as polyol esters are used as refrigerating machine oils having the required solubility. However, in particular, polyol ester-based refrigerating machine oils are highly hydrolyzable, and if there is moisture during the cycle, they react with the moisture and are decomposed into fatty acids and alcohols. The decomposition products directly attack the sliding portion and further react to form precipitates, which adhere to the cycle and cause clogging of the cycle.

On the other hand, the mainstream of air conditioners, especially home room air conditioners, is to separate the indoor unit and the outdoor unit, install them inside and outside the room, and connect them using copper pipes for connection at the site during construction. This is generally performed, and there is a very high possibility that moisture will enter the cycle as compared to products (for example, refrigerators) that complete the cycle in a factory before shipping. In particular, when the connection pipe is used again at the time of relocation, there is a high possibility that moisture will enter, so that moisture management (removal) after the cycle operation is essential.

In the past, a common method of adding a desiccant during a cycle to remove moisture is to remove a branch pipe from an appropriate part of the cycle and attach a desiccant-sealed dryer to the end of the branch pipe. The removal of the moisture in was performed. As a thing having such a configuration,
For example, there is JP-A-54-24348. FIG. 3 shows a structure in which a detachable dryer is attached to a branch pipe and removed after a proper operation.

[0007]

As described above, when a home room air conditioner is relocated, the pipe connecting the indoor unit and the outdoor unit must be removed once, so that water infiltration may occur each time. Is expected. In such a case, it is necessary to remove moisture using a dryer, and the serviceability is reduced.

Therefore, it is necessary to consider a reliable removal of water and an improvement in serviceability by devising a mounting position of the dryer.

[0009]

Means for Solving the Problems To solve the above-mentioned problem, a unit in which a dryer in which a desiccant is sealed and a refrigerant flow control device (for example, a capillary tube) are connected in series to constitute one unit is used. It is realized by installing the indoor heat exchanger in parallel between the connection pipes of the unit and the outdoor unit.

Further, by incorporating the refrigerant flow control device, clogging and abnormal wear in the cycle due to abrasion powder generated by rubbing of the desiccant body when the refrigerant passes through the desiccant by reducing the flow rate of the refrigerant is prevented.

[0011]

Embodiments of the present invention will be described below.

FIG. 1 is a cycle configuration diagram showing the basic configuration of the present invention. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a pressure reducer (such as an expansion valve), 5 is a three-way valve, 6
Denotes a refrigerant flow control device (such as a capillary tube), 7 denotes a dryer, 8 denotes an indoor heat exchanger, and 9 denotes an accumulator, all of which are connected by piping as shown in the figure. In the following description, it is assumed that the pressure reducer 4 is an expansion valve and the refrigerant flow control device 6 is a capillary.

In the heat pump cycle, the flow direction of the refrigerant is reversed between the cooling operation and the heating operation. However, during the cooling operation, the gas discharged from the compressor 1 passes through the four-way valve 2 and passes through the outdoor heat exchanger. Enter 3 and condense and liquefy. The liquefied refrigerant is decompressed by the expansion valve 4 and becomes a liquid-gas two-phase refrigerant, and the flow velocity increases. Next, the three-way valve 5 branches into the main cycle of the cycle, and the capillary 6 and the dryer 7 (bypass path) installed in parallel to the main stream. When a refrigerant having a high flow rate enters the dryer 7, abrasion of the desiccant occurs. Therefore, by providing resistance with the capillary 6, the flow rate of the refrigerant is suppressed, the wear of the desiccant is prevented, and the moisture in the cycle is removed. afterwards,
The mainstream refrigerant enters the indoor heat exchanger 8 and evaporates, and returns to the compressor 1 through the accumulator 9.

At the time of heating operation, the gas discharged from the compressor 1 passes through the four-way valve 2, and the refrigerant branches off at the three-way valve 5 into the main cycle of the cycle and the dryer 7 and the capillary 6 installed in parallel to the cycle. The water in the cycle is removed while the flow rate of the refrigerant is suppressed by the capillary 6 to prevent wear of the desiccant. Thereafter, the mainstream refrigerant enters the indoor heat exchanger 8, condenses, is decompressed by the expansion valve 4, evaporates in the outdoor heat exchanger 3, passes through the accumulator 9, and returns to the compressor 1.

According to the present invention, one unit (moisture removing device) is constituted by the capillary 6 and the dryer 7 between the three-way valves 5 shown in FIG.

FIG. 2 shows a basic configuration of the water removing apparatus. In the figure, 10 is a refrigerant flow control device (capillary), 11 is a dryer, and 12 is a flare nut. In the following description, the ten refrigerant flow control devices are considered as capillaries.

The ten capillaries and the eleven dryer are connected in series. Also, twelve flare nuts were attached to both ends.

FIG. 3 shows a detailed view of the flare connection. In the figure, reference numeral 13 denotes a union, and 14 denotes a flare nut. A refrigeration cycle is constructed by connecting the 13 unions and the 14 flare nuts.

As a result, the water removing device can be externally attached, and can be easily attached and detached and replaced.

[0020]

As described above, according to the present invention, the moisture removing device that performs the function of removing moisture in the refrigeration cycle is connected to the flare so that the moisture removing device can be externally attached, and the service can be performed. Performance can be improved.

Further, the water removing device can be set as a service part.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a refrigeration cycle targeted by the present invention.

FIG. 2 is a basic configuration diagram of a water removing device.

FIG. 3 is a detailed view of a flare connection portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... 4-way valve, 3 ... Outdoor heat exchanger, 4 ... Decompressor, 5 ... Refrigerant flow control device, 6, 11 ... Drier, 7 ...
Indoor heat exchanger, 8: accumulator, 9: three-way valve, 10
... Refrigerant flow control device, 12, 14 ... Flare nut, 13
…Union.

Claims (1)

[Claims] 1. A compressor, a condenser, a decompressor, and an evaporator are sequentially connected by a pipeline, and an HFC-based refrigerant is used as a refrigerant, and a synthetic oil (eg, a polyol ester) compatible with the refrigerant is used as a refrigerating machine oil. In particular, in an air conditioner in which an indoor unit and an outdoor unit are connected by a connection pipe at the time of installation, a moisture removal device configured as a unit with a dryer and a flow control device connected in series, An air conditioner characterized by being connected in parallel with an indoor heat exchanger between a connection pipe between an outdoor unit and an indoor unit.