JPH0577879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a compressor used in an air conditioner.

BACKGROUND ART One of the challenges to improving the comfort of air conditioners is to improve the start-up during heating, that is, to shorten the time from startup to hot air blowing. As a solution, especially in inverter air conditioners, the compressor is operated at high speed at startup, but in order to prevent refrigerant from stagnation in the compressor, which occurs before startup and is undesirable for the life of the compressor. , attach an electric heater such as a crankcase heater to the compressor,
The compressor is heated by the energization.

An example of the conventional compressor mentioned above (Japanese Utility Model Application Publication No. 142659/1983) will be described below with reference to the drawings.

FIG. 4 shows a sectional view of a conventional compressor. In the figure, 1 is a compressor, which has an electric motor part (not shown) in the upper part of a closed container 2 and a compression mechanism part 3 in the lower part. Further, lubricating oil 4 is present in the lower part of the closed container 2. On the other hand, 5 is an electric heater, which is provided at the bottom of the closed container 2. Further, a temperature sensor 6 for the lubricating oil 4 is provided at the bottom of the closed container 2 for ON/OFF control of the electric heater 5.

The operation of the compressor configured as above will be explained below.

When the compressor 1 is stopped when the outside temperature is low, the temperature of the compressor 1 decreases due to heat radiation from the closed container 2, and the refrigerant starts to move to the compressor 1 and dissolve into the lubricating oil 4. However, when the temperature of the lubricating oil 4 falls below a certain value, the electric heater 5 is activated by the temperature detector 6.
is energized. Then, the electric heater 6 heats and raises the temperature of the lubricating oil 4 through the closed container 2.
Separate the refrigerant from the In addition, the compression mechanism section 3 and the electric motor section are also heated through the airtight container 2, and the compressor 1
Raise the temperature to make it higher than the outside temperature. That is, it is possible to prevent the refrigerant from stagnation in the compressor 1 at low outside temperatures, and as a result, in the inverter air conditioner, the compressor 1 can be started at high speed, and the start-up performance during heating, that is, the comfort can be improved.

Problems to be Solved by the Invention However, in the above configuration, a large amount of heat is radiated into the atmosphere through the closed container 2 in which the electric heater 5 is provided, and therefore, the capacity of the electric heater 5 is increased beyond the necessary capacity. However, there is a problem in that power consumption increases when the air conditioner is stopped, that is, when the air conditioner is not in use.

In view of the above problems, the present invention provides a compressor that can be started at high speed at low outside temperatures without using an electric heater, that is, without consuming excess power.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes an adsorbent that uses water vapor as an adsorbent inside the outer periphery of a container that has an electric motor section and a compression mechanism section inside. It is equipped with a heat insulating material.

Effect The present invention has the above-described configuration, and the temperature drop in the compressor after the air conditioner is stopped is suppressed by heating the heat insulating material using the heat of adsorption generated when the adsorbent inside the heat insulating material adsorbs water vapor. This system maintains the temperature of the compressor at startup higher than the outside air temperature and prevents refrigerant from stagnation in the compressor.

Embodiment A compressor according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a compressor in a first embodiment of the present invention. In the figure, 7 is a compressor, and an electric motor part 9 is fixed to the upper part of the closed container 8, and a compression mechanism part 10 is fixed to the lower part. Furthermore, lubricating oil 11 is present in the lower part of the closed container 8 . A fibrous heat insulating material 12 is wound around the outer periphery of the closed container 8. Inside the heat insulating material 12, there is silica gel 13, which is an adsorbent that uses water vapor as an adsorbent. Note that 13 is a suction pipe, and 14 is a discharge pipe.

The operation of the compressor configured as described above will be described below with reference to FIGS. 1 and 2. Second
The figure is a graph showing the relationship between the equilibrium adsorption amount of silica gel and temperature.

During heating operation of the air conditioner, the compressor 7 is at approximately 90°C.
and high temperature. The state of the silica gel forming the adsorbent layer 12 is shown at point A in FIG. 2, where the amount of water vapor adsorbed is very small and the silica gel is in a regenerated state. When the compressor 7 is stopped due to the heating operation being stopped, the amount of heat stored in the compressor 7 is transferred to the suction pipe 14,
It begins to be discharged to the low-temperature outside air via the discharge pipe 15 and the heat insulating material 13, and the temperature of the compressor 7 begins to decrease.
Along with this, the temperature of the heat insulating material 12 also decreases, and the equilibrium adsorption amount of the silica gel 13 inside the heat insulating material 12 becomes second.
Increase according to the diagram. That is, the amount of water vapor adsorbed by the silica gel 13 increases, and the generated heat of adsorption heats the heat insulating material 12, raising its temperature. As a result, the temperature of the heat insulating material 12 becomes higher than that of the closed container 8, and the compressor 7 is heated by the heat insulating material 12. Therefore, heat is released from the compressor 7 through the suction pipe 14 and the discharge pipe 15, which have a small heat passage area, and the amount of heat released from the compressor 7 is greatly reduced. is slow enough.
In addition, when heating a general area, the outside temperature can be as low as 0℃ or below, so each device in the air conditioner has a temperature of about 90℃.
The temperature decreases from ℃ to outside temperature. However, the equilibrium adsorption amount of the silica gel 13 inside the heat insulating material 12 increases rapidly between 50°C and 30°C, as shown in FIG. Therefore, when the temperature of the compressor 7 falls below 50° C., the compressor 7 is heated violently due to the heat of adsorption of the silica gel. Therefore, after the air conditioner is stopped, the temperature of the heat exchanger and piping of the compressor 7 and above decreases to the outside temperature, but the temperature of the compressor 7 does not decrease to the outside temperature. That is, since the temperature of the compressor 7 is higher than that of other devices, the refrigerant does not move to the compressor 7, that is, the refrigerant does not stagnate. Therefore, the compressor 7 can be started at high speed, and the air conditioner can be started up quickly during heating. In other words, comfort can be improved.

In addition, when the compressor 7 is operated on and off by the action of the indoor thermostat of the air conditioner, the heat loss due to the heat radiation of the compressor 7 when it is turned off is suppressed to be smaller than the adsorption heat of silica gel, and as a result, the compressor 7 The temperature at the time of restart is high, and the start-up of the compressor 7 after restart is faster. Therefore, the fluctuation range of the indoor temperature during ON-OFF operation is reduced, and comfort during ON-OFF operation can be improved. It also has the effect of reducing power consumption because there is less heat loss when it is turned off.

Furthermore, in heating operations at low outside temperatures, defrosting operations are often required due to frost formation on the outdoor heat exchanger. In the defrosting operation, the adsorption heat generated by the silica gel as the temperature of the compressor 7 decreases can be used for defrosting.
Defrosting time can be shortened. That is, the fluctuation range of the indoor temperature during the defrosting operation becomes smaller, and the comfort during the defrosting operation can be improved. In addition, the compressor 7 during defrosting operation
Since the temperature of the compressor 7 can be maintained high, the reliability of the compressor 7 can also be improved.

Moreover, the silica gel 13 inside the heat insulating material 12 wrapped around the closed container 8 increases the moment of inertia of the fixed system of the compressor 7, so that vibrations of the compressor 7 can be reduced.

FIG. 3 shows a sectional view of a compressor in a second embodiment of the present invention. In the figure, 13' is silica gel, which is located inside the heat insulating material 12 and concentrated around the motor section 9. The other numbers correspond to the numbers in FIG. 1 and indicate the same configuration as the first embodiment.

This embodiment has the same functions and effects as the first embodiment, but is particularly characterized in that the temperature of the electric motor section 9 is higher than that of other parts of the compressor 7. That is, after the compressor 7 is stopped, the compressor 7 is
Although the temperature decreases, the adsorption heat of the silica gel generated inside the heat insulating material 12 increases accordingly, intensively heating the electric motor section 9 via the closed container 8.

The temperature of the entire compressor 7 is maintained above the outside temperature due to the adsorption heat of silica gel, but especially the temperature of the electric motor section 9
temperature will be higher than others. Therefore, the refrigerant discharged from the compression mechanism section 10 due to high-speed startup is heated in the electric motor section 9 and its temperature rises, so that the air conditioner starts up quickly. In other words, it is possible to effectively use a small amount of adsorbent and improve the comfort of the air conditioner.

FIG. 4 shows a sectional view of a compressor in a third embodiment of the present invention. In the figure, 13'' is silica gel, which is located inside the heat insulating material 12 and concentrated in the lower part of the sealed container 8.Other numbers correspond to the numbers in FIG. Showing the same configuration as the example.

This embodiment has the same functions and effects as the first embodiment, but is particularly characterized in that the lubricating oil 11 is heated to a higher temperature than other parts of the compressor 7. That is, after the compressor 7 is stopped, the temperature of the compressor 7 decreases due to heat radiation, but the heat of adsorption of the silica gel generated inside the heat insulating material 12 increases as a result of this, and is concentrated in the lubricating oil 11 through the closed container 8. heat up.

The temperature of the compressor 7 as a whole is maintained at a temperature higher than the outside temperature due to the heat of adsorption of silica gel, but the temperature of the lubricating oil 11 in particular becomes higher than other parts, and the viscosity of the lubricating oil 11 becomes lower. Therefore, during high-speed starting, power loss in sliding parts such as bearings can be reduced, that is, power consumption can be reduced. Furthermore, the solubility of superheated vapor of the refrigerant in the lubricating oil 11 is low, making it possible to start without forming and improving reliability.

Although silica gel has been mentioned above as an adsorbent, similar actions and effects can be obtained with any adsorbent that uses water vapor as an adsorbent.

Effects of the Invention As described above, the present invention provides a heat insulating material containing an adsorbent that uses water vapor as an adsorbent on the outer periphery of a container that contains an electric motor section and a compression mechanism section. This enables high-speed startup of the air conditioner, resulting in improved comfort during transient operation of the air conditioner and reduced power consumption. It also has effects such as improving the reliability of the compressor and reducing vibration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a compressor in a first embodiment of the present invention, FIG. 2 is a characteristic diagram of an adsorbent in the first embodiment, and FIG. 3 is a compressor in a second embodiment of the present invention. 4 is a sectional view of a compressor according to a third embodiment of the present invention, and FIG. 5 is a partial sectional view of a conventional compressor. 8...Airtight container, 9...Electric motor section, 10...Compression mechanism section, 12...Insulating material, 13...Silica gel (adsorbent).

Claims (1)

[Claims] 1. A compressor in which a heat insulating material having an adsorbent containing water vapor as an adsorbent is provided around the outer periphery of a container having an electric motor part and a compression mechanism part therein.