JPH0571810A - Separation type air conditioning apparatus - Google Patents

Abstract

PURPOSE:To prevent a liquid compression phenomenon generated at the time of starting after stoppage for a prolonged term in a separation type air conditioning apparatus having a charge-less specifications. CONSTITUTION:A refrigerant storage vessel 11 is installed at a lower position by the refrigerant allowable level of a low pressure housing type compressor 1. The bottom of the vessel 11 and a refrigerator takeoff port formed at the refrigerant allowable level are connected through a refrigerant liquid pipe 12, and the upper section of the refrigerant storage vessel 11 is connected to the suction pipe 10 of the compressor 1 through an equalizing pipe 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation type air conditioner.

[0002]

2. Description of the Related Art A refrigerant circuit of a conventional separation type air conditioner is shown in FIG. In FIG. 3, O is an outdoor unit, which includes a low-pressure housing type compressor 1, a condenser 2, an accumulator 5, an operation valve 6 and the like. Reference numeral I denotes an indoor unit, which includes a throttling mechanism 3, an evaporator 4, an operation valve 9 and the like. The outdoor unit O and the indoor unit I are connected to each other via connection pipes 7 and 8. During operation of the air conditioner, the refrigerant gas discharged from the compressor 1 is condensed and liquefied by the condenser 2 as shown by the arrow, and then enters the indoor unit I through the operation valve 6 and the connection pipe 7. Then, after passing through the operation valve 9 and adiabatically expanded by the throttling mechanism 3, it is evaporated and vaporized by the evaporator 4. This refrigerant gas returns to the outdoor unit O through the operation valve 9 and the connection pipe 8, and the operation valve 6,
It is sucked into the compressor 1 through the accumulator 5.

In this type of separation type air conditioner, in order to avoid additional charge of the refrigerant at the installation site,
A method has been widely adopted in which the outdoor unit O is filled with an amount of refrigerant that matches the case where the connection pipes 7 and 8 are long. When this system is adopted, a large-capacity accumulator 5 capable of holding an excess refrigerant is mounted in order to avoid a so-called liquid compression phenomenon during operation when the connecting pipes 7 and 8 are short, or Measures have been taken such as reducing the oil level hole diameter of the accumulator 5.

[0004]

In the above conventional separation type air conditioner, the liquid compression phenomenon during its operation can be prevented, but the liquid compression phenomenon at the time of starting after storage in the warehouse or after long-term suspension cannot be prevented. There was a problem.

[0005]

The present invention has been invented to solve the above-mentioned problems, and the gist of the invention is to connect an outdoor unit equipped with a low-pressure housing type compressor through a connecting pipe. In a separation type air conditioner connected to an indoor unit, a refrigerant storage container is provided at a lower level than the refrigerant amount allowable level of the compressor, and a refrigerant liquid collection provided at the bottom of the container and the refrigerant amount allowable level of the compressor. The separated air conditioner is characterized in that the outlet is connected via a refrigerant liquid pipe and the upper portion of the refrigerant storage container and the suction pipe of the compressor are connected via a pressure equalizing pipe.

[0006]

In the present invention, since it has the above configuration,
The excess amount of the liquid refrigerant lying in the housing of the compressor when it is stored in the warehouse of the air conditioner for a long period of inactivity and exceeds the allowable level of the refrigerant amount is caused to flow into the refrigerant storage container via the connecting pipe and is stored therein. Then, during operation of the air conditioner, the inside of the refrigerant storage container has the same pressure as the suction pipe of the compressor via the pressure equalizing pipe, so the refrigerant liquid stored therein returns to the inside of the housing of the compressor.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. The refrigerant storage container 11 is below the refrigerant amount allowable level of the compressor 1, that is, the level where the amount of liquid refrigerant in the housing is allowed.
Is installed. A refrigerant liquid outlet is provided at the refrigerant allowable level of the compressor 1, and this refrigerant liquid outlet is connected to the bottom of the container 11 via a refrigerant liquid pipe 12. Also,
The upper part of the container 11 is a suction pipe of the compressor 1 via a pressure equalizing pipe 13.
This pressure equalizing pipe is connected to the inlet side of 10 accumulators 5.
A capillary tube 14 is interposed in the tube 13. Other configurations are similar to those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.

The outdoor unit O and the indoor unit I are separately packaged and stored in a warehouse or the like, and are connected to each other via a connection pipe 7 and a connection pipe 8 at the installation site. At the time of shipping, the outdoor unit O is filled with a refrigerant amount that matches when the connection pipes 7 and 8 are long. When the air conditioner is stored in a warehouse, stopped for a long time, or stopped, the refrigerant usually enters the housing of the compressor 1 in an amount far exceeding an allowable level of the refrigerant amount.
However, the refrigerant storage container 11 is pressure-equalized with the suction pipe 10 via the pressure equalizing pipe 13, while the internal pressure of the suction pipe 10 is the same as the internal pressure of the housing of the compressor 1, the internal pressure of the container 11 is the compressor. The pressure is equal to the internal pressure of the housing of No. 1 and the container 11 is provided at a lower level than the allowable refrigerant amount level of the compressor. After that, it flows into the container 11 and is stored in the container 11.

During operation of the air conditioner, the internal pressure of the housing of the compressor 1 becomes lower than the internal pressure of the suction pipe 10 due to the pressure loss due to the accumulator 5, etc., while the container 11 passes through the suction pipe 10 and the pressure equalizing pipe 13. Since the pressure is equalized and is higher than the internal pressure of the housing, the refrigerant liquid stored in the container 11 at the time of storage and stoppage returns to the housing of the compressor 1 through the refrigerant liquid pipe 12. The capillary tube 14 is the suction pipe 10.
The amount of the refrigerant gas bypassed from the inside to the container 11 is reduced, and the refrigerant stored in the container 11 is prevented from suddenly returning to the housing of the compressor 1.

Although the embodiment in which the present invention is applied to a cooling only machine has been described above, the present invention can be applied to a cooling and heating machine as shown in FIG. In addition, in FIG.
Reference numeral 15 is a four-way valve, 16 is a throttle for heating, 17 is a check valve, 18 is a throttle for cooling, and 19 is a check valve. Also in this case, the container 11 has the same operation and effect as those of the first embodiment shown in FIG.

[0011]

According to the present invention, a refrigerant storage container is provided below the refrigerant amount allowable level of the compressor, and the bottom of the container and the refrigerant liquid outlet provided at the refrigerant amount allowable level of the compressor have a refrigerant liquid pipe. Since the upper part of the refrigerant storage container and the suction pipe of the compressor are connected via a pressure equalizing pipe, the allowable amount of refrigerant in the compressor is exceeded when the air conditioner is stored in the warehouse, is stopped for a long time, or is stopped. Since the refrigerant is stored in the refrigerant storage container, the compressor starts up in a state where the liquid refrigerant in the housing is below the allowable refrigerant amount. Therefore, the liquid compression at the time of starting can be prevented, and the damage of the compressor based on this can be prevented.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram showing a second embodiment of the present invention.

FIG. 3 is a refrigerant circuit diagram of a conventional separation type air conditioner.

[Explanation of symbols]

 O Outdoor unit I Indoor unit 7, 8 Connection pipe 11 Refrigerant storage container 10 Suction pipe 12 Refrigerant liquid pipe 13 Pressure equalizing pipe

Front page continuation (72) Inventor Taiji Hosokai, Asahi-cho 3-chome, Nishi-Biwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Air-conditioning factory, Mitsubishi Heavy Industries, Ltd. Address Mitsubishi Heavy Industries, Ltd. Nagoya Research Laboratory

Claims (1)

[Claims] 1. In a separation type air conditioner in which an outdoor unit equipped with a low-pressure housing type compressor is connected to an indoor unit through a connecting pipe, a refrigerant storage container is provided below a refrigerant amount allowable level of the compressor. A bottom portion of the container is connected to a refrigerant liquid outlet provided at a refrigerant amount allowable level of the compressor via a refrigerant liquid pipe, and an upper portion of the refrigerant storage container and a suction pipe of the compressor are equalized. A separate type air conditioner characterized in that it is connected via a.