JPS5844179B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner in which the amount of refrigerant circulated in refrigerant piping is changed by controlling the capacity of a compressor, etc. The present invention provides an air conditioner that can constantly operate efficiently by changing the condensing capacity of the condenser accordingly.

Conventionally, in this type of air conditioner where the amount of refrigerant circulated varies greatly, there were almost no devices that could adjust the condensing capacity of the condenser, and even in those that were able to adjust the condensing capacity by changing the amount of air blown, the range of adjustment of the condensing capacity was limited. If the refrigerant circulation rate is extremely narrow and the refrigerant circulation rate is about %, the condensing capacity cannot be adjusted. This has many drawbacks, such as an abnormal increase in high pressure and pressure, which can cause malfunctions, as well as an imbalance in the refrigeration cycle, requiring inefficient operation.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a refrigerant circuit diagram of the air conditioner of the present invention, in which 1 is a pole-to-number converter compressor that can be operated by switching between two-pole operation and four-pole operation, 2 is a condenser, and outdoor blower 3 and It is cooled by the ultrasonic spray device 4.

5 is a turbine flow meter that detects changes in the circulating amount of refrigerant; 6
7 is an evaporator, and has an indoor blower 8.

In addition, the condensing capacity of the condenser 2 when cooled only by the outdoor blower 3 corresponds to the amount of refrigerant circulated when the pole converter compressor 1 operates with four poles.
When the refrigerant is cooled by both the outdoor blower 3 and the ultrasonic spray device 40, the amount of refrigerant circulated corresponds to the amount of refrigerant that would be required when the pole converter compressor 1 operates with two poles.

The operation of the above configuration will now be described.

First, when the pole change type compressor 1 operates with four poles, the discharged high-temperature and high-pressure refrigerant gas is guided to the condenser 2, where it is cooled by the outdoor blower 3 and condensed and liquefied.

Thereafter, the water passes through the turbine flowmeter 5, but since the amount of circulation is small, the output signal of the turbine flowmeter 5 is weak and the ultrasonic spray device 4 is not activated.

Next, it is decompressed and expanded to the evaporation pressure by the expansion device 6, and then the evaporator 7
The air enters the room, absorbs heat from the indoor air blown by the indoor blower 8, is used for cooling and evaporates, and is then sucked into the pole change type compressor 1. Next, the pole change type compressor 1 is switched to two-pole operation. When switched, the circulating amount of refrigerant increases approximately twice, so the output signal of the turbine flowmeter 5 becomes stronger, the ultrasonic spray device 4 operates, and the condensing capacity of the condenser 2 is doubled.

That is, the high-temperature, high-pressure refrigerant gas discharged from the pole conversion type compressor 1 is cooled by the outdoor blower 3 in the condenser 2, and is also cooled by the latent heat of vaporization of the minute droplets sprayed by the ultrasonic spray device 4. It is cooled, condensed and liquefied, passes through the turbine flowmeter 5, is decompressed and expanded to the evaporation pressure by the throttle device 6, enters the evaporator 7, absorbs heat from the indoor air blown by the indoor blower 8, and is used for cooling. After being evaporated, it is sucked into the pole change type compressor 1.

As described above, in the above embodiment, the circulating amount of refrigerant is detected by the turbine flow meter 5, and the
Although the ultrasonic spray device 4 is controlled, the present invention is not limited to this, and even if other refrigerant circulation amount detection methods (for example, using an orifice) are used, other spray devices (for example, a centrifugal spray device or a nozzle) may be used. ) can obviously be used.

FIG. 2 shows another embodiment of the present invention, in which the same functional parts as in FIG. 1 are given the same numbers.

In other words, 1 is a pole change type compressor, 2 is a condenser, 3 is an outdoor blower, 6 is a throttle device, 7 is an evaporator, and 8 is an indoor blower. A spray nozzle 11 is provided, and the control valve 10 is controlled by a temperature difference switch 14 having a temperature sensing section 12 for detecting the air temperature on the inlet side of the evaporator 70 and a temperature sensing section 13 for detecting the air temperature on the outlet side. It is configured so that

FIG. 3 shows the relationship between the amount of refrigerant circulated and the air temperature difference at the entrance and exit of the evaporator 7 when the indoor blower 8 is rotated at a constant speed.

In other words, in the case of the pole change type compressor 1 of the embodiment shown in FIG. 2, during 4-pole operation, the air temperature difference is about 4.5°C at a circulation rate of 40 kg/h, but the rotation speed is about twice as high. During two-pole operation, a circulation rate of 80 to 9/h results in an air temperature difference of approximately 8°C.

Furthermore, this relationship not only changes depending on the specifications of the evaporator 7 and the indoor blower 8, but also changes somewhat depending on the inlet air temperature, voltage, and other conditions. The operating temperature setting is 7° C., and when the air temperature difference exceeds 7° C., the control valve 10 is opened and the spray nozzle 11 sprays minute water droplets.

The operation of the configuration as described above will be explained next.

First, when the pole change type compressor 1 operates with four poles, the third
As shown in the figure, the air temperature difference at the entrance and exit of the evaporator 7 is 45
Since the temperature is about 0.degree. C., the temperature difference switch 14 does not operate.

That is, the high temperature and high pressure refrigerant gas discharged from the pole change type compressor 1 enters the condenser 2, is cooled by the outdoor blower 3, and is condensed and liquefied.

Thereafter, the air passes through a throttle device 6 and an evaporator 7 for cooling, and then returns to the pole change type compressor 1.

Next, if the pole change type compressor 1 is switched to two-pole operation, the amount of refrigerant circulation increases, and the air temperature difference at the inlet and outlet of the evaporator 7 exceeds the operating setting temperature of the temperature difference switch 14, and the ℃, the control valve 10 is opened, minute water droplets are sprayed from the spray nozzle 11, and the condensing capacity of the condenser 2 is doubled.

That is, the high-temperature, high-pressure refrigerant gas discharged from the pole converter compressor 1 enters the condenser 2 and is cooled by the outdoor blower 3, as well as by the latent heat of vaporization of minute water droplets sprayed from the spray nozzle 11. Condensate and liquefy.

Thereafter, the air passes through a throttle device 6 and an evaporator 7 for cooling, and then returns to the pole change type compressor 1.

As described above, in the embodiments shown in FIGS. 1 and 2, the circulating amount of refrigerant is directly or indirectly detected to control the spraying device intermittently, but the present invention is not limited to this, and the present invention is not limited to this. When the amount of refrigerant circulated changes continuously, such as when using a The amount of spray can also be changed by controlling the spray device.

Furthermore, Fig. 4 shows the relationship between the amount of refrigerant circulation and the air temperature difference at the inlet and outlet of the condenser, but since there is a similar tendency as in Fig. 3, the relationship between the refrigerant circulation amount and the air temperature difference in the condenser inlet and outlet is shown. The same effect as in the embodiment can be obtained.

As is clear from the above description, the present invention provides an air conditioner in which a compressor, a condenser, a throttle device, an evaporator, etc. are connected through refrigerant piping, in which micro droplets are sprayed onto the condenser. The air conditioner is characterized in that the spray device is provided with a spray device, and the spray device is controlled to change the spray amount according to the amount of refrigerant circulated in the condenser or refrigerant pipe.
In addition to capacity control by controlling the rotation speed of the compressor,
It is possible to change the condensing capacity of the condenser over a wide range with one method for capacity control using various methods such as unloading and bypass-type refrigerant circulation rate control.
By adjusting the condensing capacity to match the amount of refrigerant circulated, the refrigeration cycle can be balanced and the air conditioner can be operated efficiently.

In addition, since the heat exchanger utilizes the latent heat of vaporization of the minute droplets sprayed from the spray device, the heat exchanger becomes extremely compact, and by changing the spray amount, the condensation capacity can be greatly increased (3
Since it can be adjusted (up to 4 times), it can also accommodate large changes in the amount of refrigerant circulated.

Therefore, it is possible to prevent malfunctions such as an abnormal increase in high pressure and force.

In addition, by installing a flow meter that detects changes in the amount of refrigerant circulation in a part of the refrigerant piping, and controlling the spray device based on the output signal of the flow meter, the response is quick and reliable, and the refrigerant It becomes possible to adjust the condensing capacity in response to minute fluctuations in the amount of circulation.

Furthermore, the spray device can be controlled by detecting the difference in air temperature at the inlet and outlet of the condenser or evaporator, which changes depending on the amount of refrigerant circulated, making it possible to braze a flow meter to the refrigerant piping. Instead, the same effect can be obtained using a simple difference switch or the like.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram of an air conditioner according to another embodiment of the present invention, and FIG. 3 is a diagram of the refrigerant circulation amount and evaporation. FIG. 4 is a characteristic diagram showing an example of the relationship between the air temperature difference at the entrance and exit of the condenser, and FIG. 1...Pole conversion type compressor, 2...Condenser, 4...Ultrasonic spray device, 5...
Turbine flow meter, 6... Throttle device, 7...
... Evaporator, 11... Spray nozzle, 14...
...Differential temperature switch.

Claims (1)

[Scope of Claims] 1. A compressor, a condenser, a throttle device, an evaporator, etc. are connected by refrigerant piping, and a spray device for spraying minute droplets onto the condenser is provided, and the condenser or refrigerant piping is An air conditioner comprising a control means for controlling the spray device and changing the spray amount according to the amount of refrigerant circulated within the air conditioner. 2. Claims characterized in that the control means is constituted by a flow meter installed in a part of the refrigerant piping and detects changes in the amount of refrigerant circulated, and the spray device is controlled by the output signal of the flow meter. The air conditioner according to paragraph 1. 3. The control means detects the air temperature difference at the entrance and exit of the condenser or evaporator, which changes depending on the amount of refrigerant circulation,
The air conditioner according to claim 1, characterized in that the air conditioner controls a spray device.