JPH10220931A - Manufacture of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the level of water mixed inside a compressor at the assembling of it to a level harmless for an ester or ether oil regarding to reliability by evacuating the compressor heated and held at predetermined temperature or higher. SOLUTION: After heating an outdoor unit, keeping the temperature of a compressor 1 at 50 deg.C or more at the evacuation in a process, performing the evacuation, for example, for a minute or longer in this state and confirming it reaching enough vacuum level, the refrigerant is injected and injecting hole is sealed. For example, after heating a compressor 1 injected with an ester oil containing the water of 1000ppm to, for example, 140 deg.C for 15 minutes by a band heater 2 for heating, performing the evacuation for one minute at ten minutes afterward the removal of the heater 2 for heating and decreasing the vacuum pressure to twenty Pa or less continuing the evacuation, the temperature of the outside surface of the upper part of the compressor 1 is 40 deg.C. Afterward, the water content inside the compressor is measured accurately and the water content is 200ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a separate type air conditioner, and more particularly to a method for controlling moisture.

[0002]

2. Description of the Related Art Conventionally, in a method of manufacturing an air conditioner, sufficient vacuum evacuation is performed before a refrigerant is injected into an outdoor unit main body, and if the degree of vacuum reaches a sufficient value, removal of water in a cycle and piping. The leak was confirmed, and the refrigerant was injected thereafter to complete the outdoor unit.

[0003] In recent years, due to rising regulations on the environment such as destruction of the ozone layer and global warming, HF containing no chlorine has been developed.
Development of an air conditioner using C (Hydro Fluoro Carbon) is urgent. Since HFC refrigerant does not contain chlorine, conventional HCFC (Hydro Chl
Lubricity like that of the Oro Fluoro Carbon cannot be expected. For this reason, the oil sealed in the closed container is
A material that is compatible with the HFC refrigerant is particularly required. The oil sealed in the closed container is stirred by the HFC refrigerant discharged from the compression mechanism into the closed container, and is also stirred by the rotor of the electric motor. At this time, since the oil is compatible with the refrigerant, it accompanies the refrigerant discharged into the closed container well, and extends to the details of the sliding parts of each machine.
Lubrication performance is improved. Such oils are disclosed in
As known from JP-A-235570 and the like, synthetic oils of ester type or ether type are being used.

[0004]

However, the above-mentioned ester-based or ether-based oils are both liable to absorb moisture, and a compressor using such an oil is more fully controlled than an air conditioner under conventional control. Outdoor units).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of manufacturing an air conditioner compatible with HFC refrigerant by the conventional manufacturing method, and provides a manufacturing method capable of removing moisture mixed in a compressor during the assembly process. It is intended for.

[0006]

According to the present invention, in order to solve the above-mentioned problems, the compressor is heated and evacuated while maintaining the compressor at a predetermined temperature or higher. This makes it possible to reduce the amount of water mixed in the compressor during the assembly process to a level at which there is no problem with the reliability of the ester or ether oil.

[0007] As a method of heating the compressor to a predetermined temperature or higher, one of the three-phase motors is disconnected and energized. In this case, the compressor is heated from the inside without rotating the motor.

As another heating method, current is supplied to all three phases. In this case, the compressor is heated from the inside more uniformly while rotating at a low Hz and stirring the oil and mixed water.

[0009] By performing the vacuum evacuation while rotating the motor, it is possible to more positively reduce the amount of water contained.

[0010]

According to a first aspect of the present invention, there is provided an outdoor unit manufacturing process for a separate type air conditioner, wherein a compressor of the outdoor unit is heated to a predetermined temperature or higher. Vacuum evacuation is performed while holding the refrigerant, and then the refrigerant is injected into the outdoor unit main body.

According to the second aspect of the present invention, when the compressor is heated, one of the three phases is disconnected and the current is supplied.

According to a third aspect of the present invention, when the compressor is heated, the compressor is driven at a frequency of 20 Hz or less by energizing three phases.

According to a fourth aspect of the present invention, in the step of manufacturing the outdoor unit of the separate type air conditioner, the compressor of the outdoor unit is heated and the vacuum is maintained while maintaining the predetermined temperature or higher while rotating the motor. The air is exhausted, and then the refrigerant is injected into the outdoor unit main body.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail.

Embodiment 1 FIG. 1 is a schematic manufacturing process diagram showing an embodiment of the first invention. For the outdoor unit, the process of mounting the refrigeration cycle and the attachment parts is almost completed from the installation on the compressor bottom plate in the process A to the installation of the propeller fan in the process D. The compressor was heated during the B step from the A step to the D step, and the compressor was kept at about 50 ° C. even during the evacuation in the E step. In that state, the chamber is evacuated for 1 minute or more, and a sufficient vacuum level (20
(Pa or less), the refrigerant was injected in the G step, and the injection hole was sealed in the H step.

FIG. 2 is a schematic view showing a method of heating the compressor (other connecting parts are not shown). In the figure, 1 is a compressor, 2 is a heating band heater, 3 is a motor input terminal, 4 is a discharge port, and 5 is a suction port. In this embodiment, a compressor into which ester-based oil containing 1000 ppm of water is injected is used to heat the compressor with a heating band heater at 140 ° C. for 15 minutes, and then the heating heater is removed. After about 10 minutes, vacuum evacuation was performed for one minute. As a result, the ultimate degree of vacuum was 25 Pa, and the vacuum evacuation was continued to 20 Pa or less. At this time, the upper outer surface of the compressor was at 40 ° C. Then, as a result of accurate measurement of the water content in the compressor,
It was 00 ppm.

(Embodiment 2) Similar to Embodiment 1, 1000p
An outdoor unit was completed by a similar assembly process using a compressor into which an ester-based oil containing pm of water was injected. However, the upper outer surface of the compressor when evacuated is 5
The temperature was 0 ° C., and the degree of vacuum reached for one minute was 30 Pa.
Thereafter, as a result of accurately measuring the water content in the compressor, the water content was 120 ppm.

(Embodiment 3) The same as in Embodiment 1, 1000p
An outdoor unit was completed by a similar assembly process using a compressor into which an ester-based oil containing pm of water was injected. However, the upper outer surface of the compressor when evacuated is 6
The temperature was 0 ° C., and the degree of vacuum reached for one minute was 40 Pa.
Thereafter, the water content in the compressor was measured accurately, and as a result, the water content was 80 ppm.

(Comparative Example 1) 1000 p in the same manner as in Example 1.
An outdoor unit was completed by a conventional method (without heating the compressor) using a compressor into which an ester-based oil containing pm of water was injected. However, the working temperature at the time of evacuation was about 15 ° C., and the ultimate degree of vacuum for one minute was 10 Pa. Thereafter, the water content in the compressor was accurately measured, and as a result, the water content was 800 ppm.

As is clear from Examples 1 to 3 and Comparative Example 1, when the temperature of the compressor is low, even if the degree of vacuum is high, the water contained therein has not been driven out and the residual water is large. Was. Therefore, in order to reduce the amount of water mixed in the manufacturing process, it was preferable to evacuate the compressor while maintaining the compressor at a high temperature. However, care must be taken because if the temperature is too high, the additives in the oil may volatilize or the oil may deteriorate. Therefore, the compressor heating by the band heater is heated at the limit temperature (around 140 ° C) where there is no concern about the effect on the oil, and the outer surface of the heated compressor gradually transfers heat to the inside to make it uniform. It is preferable to evacuate at least 40 ° C. or more, preferably 60 ° C. or more.

In the first to third embodiments, the compressor is heated in the step B. However, the compressor can be heated in any of the steps A to D. A point to be noted was the compressor temperature in the E step.

(Embodiment 4) In this embodiment, the same compressor as that of Embodiment 1 in which an ester-based oil mixed with water was injected was used. FIG. 3 is a side view of the compressor, 3 is an input terminal of the motor, 4 is a discharge port, and the input terminal 3 has three terminals, 6 is terminal A, 7 is terminal B, Reference numeral 8 denotes a terminal C. The terminals 6 and 7 were energized to raise the motor coil temperature to 110 ° C. Thereafter, after the upper outer side surface of the compressor had dropped to 60 ° C., vacuum evacuation was performed for one minute. At this time, the degree of vacuum reached was 25 Pa. Thereafter, the water content in the compressor was measured accurately, and as a result, the water content was 60 ppm.

In the fourth embodiment, the terminal coils 6 and 7 are energized to increase the motor coil temperature. However, the terminal terminals used for energization and heating can obtain substantially the same result even when the terminals 6 and 8 or 7, 8 are energized. Was done. Further, if the input voltage used for heating is too high, local heating will occur. Therefore, it is preferable to set the input to about 10 to 15 V. In addition, in order to make the temperature inside the compressor uniform, 10 to 15
It was more effective to provide a cooling time after heating by applying an electric current of about V to make the whole uniform, than to carry out heating slowly by applying an input of about 5 to 10 V.

(Embodiment 5) In this embodiment, the same compressor as that of Embodiment 1 was used, in which an ester-based oil mixed with water was injected. The input terminals 6, 7 of the three-phase motor in FIG.
8, the motor coil temperature was increased to 110 ° C. at the same time as rotating at 10 Hz. Thereafter, after the upper outer side surface of the compressor had dropped to 60 ° C., vacuum evacuation was performed for one minute. At this time, the degree of vacuum reached was 18 Pa. Then, as a result of accurately measuring the moisture in the compressor, the moisture was 40p
pm.

In the fifth embodiment, the motor is rotated at the lowest frequency of 10 Hz. However, a high rotation speed is not preferable because oil in the compressor gradually flows out to an external cycle path. Therefore, the rotation speed of the motor is 20 Hz or less,
More preferably, the frequency was set to 15 Hz or less.

Comparing Examples 4 and 5, it was found that the convection of the oil by rotating the motor made the temperature distribution in the compressor uniform, and was more effective in reducing the amount of moisture mixed in the vacuum exhaust.

(Embodiment 6) In this embodiment, the same compressor as that of Embodiment 1 was used in which an ester oil mixed with water was injected. Further, in the present embodiment, after heating for 15 minutes with the heating band heater in the same manner as in the first embodiment, the heating heater was removed and cooling was performed. When the upper outer surface of the compressor reached 50 ° C.,
Energize the input terminals 6, 7, and 8 of the three-phase motor and
The vacuum was evacuated for 1 minute at the same time as rotating at Hz.
At this time, the degree of vacuum reached was 35 Pa. Thereafter, the water content in the compressor was accurately measured, and as a result, the water content was 50 ppm.

(Embodiment 7) In this embodiment, the same compressor as that of Embodiment 1 in which an ester-based oil mixed with water was injected was used. In the present embodiment, the input terminals 6, 7, and 8 of the three-phase motor were energized to rotate at 10 Hz and the motor coil temperature was raised to 110 ° C. at the same time as in the fifth embodiment. Then, after the upper outer surface of the compressor dropped to 60 ° C., the input terminals 6, 7, and 8 of the three-phase motor were again energized, rotated at 10 Hz, and simultaneously evacuated for one minute. At this time, the degree of vacuum reached was 15 Pa.
Thereafter, as a result of accurately measuring the water content in the compressor, the water content was 20 ppm.

As is evident from Examples 6 and 7, it was found that performing vacuum evacuation while rotating the motor was more effective in reducing water contamination.

In Examples 1 to 7, the operation was performed using a compressor into which an ester oil was injected. However, the same tendency was obtained when an ether oil was used.

[0031]

As is apparent from the above embodiment, the invention according to claim 1 is characterized in that, in the outdoor unit manufacturing process of the separate type air conditioner, the compressor of the outdoor unit is heated to a predetermined temperature and then evacuated. Then, by injecting the refrigerant, the water mixed in the compressor during the assembly process could be efficiently reduced.

According to the second aspect of the present invention, the compressor can be uniformly heated from the inside by removing one of the three-phase motors as a method for heating the compressor.

According to the third aspect of the present invention, as a method of heating the compressor, the oil is agitated by energizing the three-phase motor at a low Hz, so that the compressor can be more uniformly heated from the inside.

According to the fourth aspect of the present invention, after the compressor of the outdoor unit is heated to a predetermined temperature and then evacuated while rotating the motor, the water content can be reduced more quickly. Was.

[Brief description of the drawings]

FIG. 1 is a schematic manufacturing process diagram of an outdoor unit of an air conditioner performed according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a compressor heating method performed according to Embodiment 1 of the present invention.

FIG. 3 is a side view of a compressor used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Heating band heater 3 Motor input terminal 4 Discharge side port 5 Suction side port 6 Terminal terminal A 7 Terminal terminal B 8 Terminal terminal C

Claims (4)

[Claims] In a manufacturing process of an outdoor unit of a separate type air conditioner, after a compressor of the outdoor unit is heated, a vacuum is exhausted while maintaining a predetermined temperature or higher, and then a refrigerant is discharged to the outdoor unit main body. A method for producing an air conditioner, wherein the air is injected into the inside. 2. The method for manufacturing an air conditioner according to claim 1, wherein when heating the compressor, one of the three-phase motors is disconnected to energize. 3. The method for manufacturing an air conditioner according to claim 1, wherein when heating the compressor, the three-phase motor is energized and driven at a frequency of 20 Hz or less. 4. In an outdoor unit manufacturing process of a separate type air conditioner, vacuum exhaust is performed while rotating a motor while a compressor of the outdoor unit is kept at a predetermined temperature or higher, and then refrigerant is removed from the outdoor unit. A method for manufacturing an air conditioner, wherein the air conditioner is injected into a main body of the air conditioner.