JPH0791753A - Air conditioner - Google Patents

Abstract

PURPOSE:To perform the most suitable operation of a freezing cycle by a method wherein a compressor and a condenser constituting a refrigeration cycle together with an evaporator are cooled with cooling water in a water tank so as to prevent leakage of fluorocarbon or to reduce noise and a blower is controlled in response to a detected temperature of cooling water. CONSTITUTION:Fluorocarbon compressed with a compressor 2 and becoming superheated vapor is cooled with cooling water within a water tank 10 when it is passed through a condenser 5 to become liquid, thereafter it is adiabatically expanded while passing through a capillary tube 9, it becomes liquid of low temperature and low pressure and enters an evaporator 3. In addition, fluorocarbon is heat exchanged with air at the evaporator 3 and is evaporated, thereafter returns to the compressor 2. In turn, cooling water having cooled the condenser 5 and having its temperature increased is sent by a circulation pump 13 to a radiator 11 so as to prevent leakage of fluorocarbon and at the same time noise is reduced. At this time, a temperature of cooling water in the water tank 10 is detected and the blower 12 is controlled in response to the detected temperature. With such an arrangement as above, the refrigeration cycle is operated in the most suitable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a refrigeration cycle and a blower for blowing cold air.

[0002]

2. Description of the Related Art Conventionally, as an air conditioner capable of indoor cooling equipped with a refrigeration cycle and a blower for blowing cold air,
As shown in FIG. 7, the compressor 2 and the evaporator 3 arranged in the main body 1 and the condenser 5 arranged in the heat dissipating unit 4 installed outdoors form a refrigeration cycle, and at the same time, the refrigerant CFC is used. It is sent to the condenser 5 via the flexible hose 6 and the condenser 5 is cooled by the condenser cooling fan 5a to condense the CFCs passing through the condenser 5 and then circulate it again in the room. 8 and the separate type described above, the outdoor air is sucked from the intake duct 7a by the condenser cooling fan 5a as shown by the arrow in FIG. There is an intake / exhaust duct type in which the air is exhausted to the outside through the duct 7b.

[0003]

However, in such a conventional air conditioner, the separate type air conditioner not only increases the cost because the flexible hose corresponding to CFC is expensive, but also the flexible hose itself and the flexible hose shown in FIG. Since the CFC leakage occurs at the connecting portion 6a between the flexible hose 6 and the pipe shown in (1), there is a problem that not only the cooling capacity gradually decreases but also the environment is destroyed.

On the other hand, in the intake / exhaust duct type, the air for cooling the condenser is taken in from the intake duct. However, this increases the air resistance, so that the amount of air taken in becomes small. Cooling capacity is reduced.
Therefore, in order to obtain a desired cooling capacity, it is necessary to increase the rotation speed of the condenser cooling fan 5a, and when the rotation speed of the condenser cooling fan 5a is increased in this way, noise increases. There was a point.

Therefore, the present invention has been made in order to solve such a problem, and an object thereof is to provide an air conditioner capable of preventing freon leakage and reducing noise. .

[0006]

SUMMARY OF THE INVENTION The present invention is an air conditioner equipped with a compressor, a condenser, a refrigeration cycle including an evaporator, and a blower for blowing out the cold air obtained by the evaporator. A water tank for cooling the condenser, which houses the condenser and cools the condenser with cooling water.
A radiator that is connected to the water tank via a circulation path and radiates cooling water after cooling the condenser; a blower provided on the radiator; and a heat radiation provided on the circulation path. A circulation pump that circulates the cooling water after being radiated in the water tank to the water tank, and detects the temperature of the cooling water in the water tank, and changes the rotation speed of the blower according to the detected temperature to change the air volume. And an air volume control device for controlling.

The present invention also provides an air conditioner comprising a compressor, a condenser, a refrigeration cycle including an evaporator, and a blower for blowing out the cool air obtained by the evaporator, A water tank for cooling the condenser, which stores the condenser and cools the condenser with cooling water, is connected to the water tank via a circulation path, and dissipates the heat of the cooling water after cooling the condenser. A radiator for performing, a blower provided for the radiator, a circulation pump provided in the circulation path for circulating cooling water after being radiated by the radiator to the water tank, and the water tank And a circulation amount control device for detecting the temperature of the cooling water inside and controlling the circulation amount of the cooling water by changing the flow rate of the circulation pump according to the detected temperature.

[0008]

A condenser forming a refrigeration cycle together with a compressor and an evaporator can be housed in a water tank for cooling the condenser, and the condenser can be cooled by cooling water in the water tank. The cooling water after cooling the condenser can be dissipated by the radiator connected to the water tank via the circulation path, and the radiator can be cooled by the blower provided in the radiator. . Further, the cooling water, which has been radiated by the radiator by the circulation pump provided in the circulation path, can be circulated and supplied to the water tank.

Further, by detecting the temperature of the cooling water in the water tank,
The air volume control device can control the air volume by changing the rotation speed of the blower according to the detected temperature. On the other hand, it is possible to detect the temperature of the cooling water in the water tank and change the flow rate of the circulation pump according to the detected temperature by the circulation amount control device to control the circulation amount of the cooling water.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of an air conditioner according to a first embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding portions.

In the figure, 8 is disposed behind the evaporator 3, and a blower for the evaporator is provided for blowing out cold air that has undergone heat exchange in the evaporator 3, and 9 is provided between the condenser 5 and the evaporator 3. It is a provided capillary tube. Further, 10 is a water tank for cooling the condenser that houses the condenser 5, and the condenser 5 can be cooled by circulatingly supplying cooling water to the water tank 10 through a circulation path described later. It is like this.

Then, the condenser 5 is connected to the water tank 1 in this way.
By cooling with the cooling water circulated to 0, all the refrigeration cycles are connected by the refrigerant pipe L1, and the CFCs are cooled without passing through the flexible hose like the separate system described above. Because it is possible, it is possible to prevent CFC leakage. Further, unlike the above-mentioned intake / exhaust duct system, the CFC can be cooled without using a condenser cooling fan, so that noise can be reduced.

On the other hand, a radiator 11 and a radiator blower 12 provided in the radiator 11 are arranged outdoors, for example, inside the radiator 4 provided on the outer wall 4A. Here, the radiator 11 is connected to the water tank 10 through a cooling water circulation path L2 formed by a hose or the like, and the condenser 5
The cooling water is radiated after cooling.

A circulation pump 13 is provided on the main body 1 side of the cooling water circulation path L2.
At 3, the cooling water in the water tank 10 passes through the radiator 11 as shown by the arrow, and then is cooled to a low temperature.
It is circulated and supplied internally.

By the way, an inlet temperature sensor 14 and an outlet temperature sensor 15 shown in FIG. 2 are provided at the inlet 10a and the outlet 10b of the water tank 10 in order to detect the temperature of the cooling water. The temperature information from 15 is used as the air volume control device 16 provided at a predetermined position of the main body 1.
Is input at a predetermined timing. In this embodiment, the inlet 11a and the outlet 1 of the radiator 11 are
1b is provided with an inlet temperature sensor and an outlet temperature sensor (not shown) for detecting the temperature of the cooling water,
The air volume control device 16 includes a radiator 1 from these temperature sensors.
The temperature information of the first cooling water is also input.

Here, the air volume control device 16 detects the cooling water temperature based on the temperature information from the temperature sensors 14 and 15, and at the same time, the cooling water temperature and the inlet temperature of the compressor 2 stored in a storage unit (not shown). And the outlet temperature of the compressor 2 based on a table showing the relationship between the inlet temperature and the outlet temperature, and the temperature of the CFC in the two-phase state in the condenser 5 in the two-phase state (hereinafter referred to as the condensation temperature) (from the inlet temperature and the outlet temperature) ( Tcc) is calculated.

Here, since the normal condensation temperature (Tcc) and the discharge pressure (Pd) of the compressor 2 have a 1: 1 relationship as shown in the Ph diagram of FIG. If Tcc) is obtained, the discharge pressure (Pd) of the compressor at that time can be known.

Therefore, the air flow controller 16 uses the temperature information from the temperature sensors 14 and 15 to determine the condensation temperature (Tc).
From c), the discharge pressure (Pd) of the compressor is obtained based on a table showing the relationship between the condensation temperature and the discharge pressure (Pd) of the compressor stored in the storage unit. And
The temperature of the cooling water is controlled so that the discharge pressure (Pd) of the compressor thus obtained falls within the normal pressure range.

Here, if the discharge pressure of the compressor 2 obtained based on the temperatures detected by the temperature sensors 14 and 15 exceeds the normal pressure temperature range, the air volume control device 16 of the radiator blower 12 operates. The number of rotations is increased. Then, by increasing the number of rotations of the radiator blower 12 in this manner, the cooling water temperature is lowered and the condensing temperature (Tcc) is lowered, whereby the discharge pressure of the compressor 2 can be lowered. .

When the discharge pressure of the compressor 2 is lower than the normal pressure temperature range, the rotation speed of the radiator blower 12 is decreased to raise the cooling water temperature, thereby raising the condensing temperature (Tcc). The discharge pressure of the compressor can be increased.

In the air conditioner thus constructed, the chlorofluorocarbon which is compressed by the compressor 2 and becomes superheated vapor is cooled by the cooling water in the water tank 10 when passing through the condenser 5. Becomes liquid, and then the capillary tube 9
When it passes through, it becomes a low-temperature low-pressure liquid by adiabatic expansion and enters the evaporator 3. Further, the chlorofluorocarbon, which has become a low-temperature and low-pressure liquid, exchanges heat with air in the evaporator 3 to evaporate, and then returns to the compressor 2. The cool air that has undergone heat exchange in the evaporator 3 is blown out by the blower 8 for the evaporator.

On the other hand, the cooling water in the water tank 10 whose temperature has risen by cooling the condenser 5 is radiated by the radiator 1 by the circulation pump 13.
After being sent to 1, the radiator 11 is circulated and supplied to the water tank 10 while being cooled by the radiator blower 12 to have a low temperature when passing through the radiator 11. As a result, the condenser 5 is cooled by the cooling water which is always in the low temperature state.

During operation, the air volume control device 16 determines the condensation temperature (Tcc) based on the temperature information from the temperature sensors 14 and 15 input at a predetermined timing. Here, for example, as shown in FIG. 4, the discharge pressure of the compressor 2 increases due to the load condition, and the outlet temperature (t2) of the water tank 10 rises at the point b and the maximum discharge temperature (Td) increases. ), The temperature t2 ′ corresponding to
When the condensation temperature (Tcc) is calculated from the outlet temperature of the water tank 10 and the inlet temperature (t1) of the water tank 10 at this time,
This condensation temperature (Tcc) becomes higher than usual.

When the discharge pressure of the compressor 2 obtained from the condensation temperature (Tcc) exceeds the normal pressure temperature range, the rotation speed of the radiator blower 12 is increased. As a result, the temperature of the cooling water decreases, and along with this, the outlet temperature (t1 ′) of the radiator 11 at point c in the figure becomes lower than the temperature (t1) up to that point, so that the condensation temperature (Tcc) remains unchanged. Returning to the value, the discharge pressure of the compressor 2 decreases.

On the other hand, when the discharge pressure of the compressor 2 is lower than the normal pressure temperature range, the discharge pressure of the compressor is increased by decreasing the rotational speed of the radiator blower 12 and increasing the cooling water temperature. You can

In this way, the condenser 5 is circulated with the circulating cooling water.
By cooling the water, it is possible to condense the freon quietly and without causing freon leakage, and by connecting the water tank 10 and the radiator 11 via the cooling water circulation path L2, the water tank 10 Cooling water having a low temperature can be circulated and supplied therein.

Further, by changing the number of revolutions of the radiator blower 12 according to the temperature of the cooling water in the water tank 10 to keep the discharge pressure of the compressor 2 within the normal pressure temperature range, the refrigeration cycle is Optimal operation can be achieved, which can extend the life of the refrigeration cycle.

By the way, when the air conditioner is used at a low ambient temperature such as in winter, the evaporator 3 may be frosted and the dehumidifying effect may be deteriorated. When the air volume control device 16 detects that the room temperature is lower than a predetermined temperature based on the temperature detected by the room temperature sensor, the air volume of the radiator blower 12 is reduced or the radiator blower 12 is stopped. .

As a result, the cooling water temperature can be raised and the capacity of the compressor 2 can be weakened. When the capacity of the compressor 2 is weakened in this way, frost formation on the evaporator 3 decreases and the dehumidifying effect is impaired. There is no such thing. By changing the air flow rate according to the room temperature in this way, even during normal cooling, the cooling capacity can be lowered when the room temperature becomes equal to or lower than the set temperature, and thus power saving can be achieved.

In the above description, the air conditioner in which the heat radiating portion 4 is provided outdoors has been described, but the heat radiating portion 4 may be incorporated in the main body 1 as in the air conditioner shown in FIG. . Then, in this way
The main body 1 can be moved in a wide range by being incorporated in the.

In the above description, the amount of air is controlled by changing the rotation speed of the radiator blower 12, and the temperature of the cooling water is controlled. However, the present invention is not limited to this. Not limited to this, the flow rate of the cooling water can be controlled by changing the flow rate of the circulation pump 13 to control the temperature of the cooling water.

FIG. 6 is a diagram showing the structure of a circulation amount control device provided in an air conditioner according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG.
The same or corresponding parts are shown.

Here, the circulation amount control device 17 shown in FIG.
Indicates the temperature of the cooling water in the water tank 10 by the inlet temperature sensor 14
And the outlet temperature sensor 15, and the flow rate of the circulation pump 13 is changed according to the detected temperature to control the circulation amount of the cooling water to control the temperature of the cooling water. By the way, generally, the relationship between the heat radiation amount and the flow rate is expressed by the following equation.

Q = CqΔT Here, Q is the heat radiation amount (Kcal / h), and C is the specific heat (Kc).
al / Kg ° C.), q is the flow rate (Kg / h), and ΔT is the temperature difference (° C.).

The specific heat of water is about 1 Kcal / K.
Since it is g ° C., the above equation can be approximated as Q = qΔT. Therefore, when the discharge pressure of the compressor 2 obtained from the temperature information from the temperature sensors 14 and 15 is out of the normal pressure temperature range, the circulation amount control device 17 changes the flow rate of the circulation pump 13 to perform cooling. The discharge pressure is controlled to be within the normal pressure temperature range by controlling the water circulation amount.

That is, in the circulation amount control device 17, for example, the discharge pressure of the compressor 2 becomes high depending on the load condition, and the discharge pressure of the compressor 2 obtained by the condensation temperature (Tcc) exceeds the normal pressure temperature range. In some cases, the flow rate of the circulation pump 13 is increased. As a result, the circulation amount of the cooling water is increased to increase the heat radiation amount, and the discharge pressure of the compressor 2 is reduced accordingly.

On the other hand, when the discharge pressure of the compressor 2 is lower than the normal pressure temperature range, the flow rate of the circulation pump 13 is reduced to reduce the circulation amount of the cooling water, thereby increasing the cooling water temperature. Increase the discharge pressure of the compressor.

In this way, the flow rate of the circulation pump 13 is changed according to the temperature of the cooling water in the water tank 10 to control the circulation amount of the cooling water, and the discharge pressure of the compressor 2 is kept within the normal pressure temperature range. By doing so, the refrigeration cycle can be optimally operated.

[0040]

As described above, according to the present invention, since the condenser is cooled with water, it is possible to prevent freon leakage and reduce noise. Also,
The refrigeration cycle can be optimally operated by detecting the cooling water temperature in the water tank and controlling the air volume of the blower according to the detected temperature. Further, by detecting the cooling water temperature in the water tank and controlling the circulation amount of the cooling water according to the detected temperature, the refrigeration cycle can be optimally operated.

[Brief description of drawings]

FIG. 1 is a side sectional view of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an air volume control device of the air conditioner.

FIG. 3 is a Ph diagram.

FIG. 4 is a diagram showing how the cooling water temperature of the air conditioner changes.

FIG. 5 is a side cross-sectional view of the air conditioner in which a heat dissipation unit is incorporated in the main body.

FIG. 6 is a diagram showing a configuration of a circulation amount control device for an air conditioner according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram showing an example of a conventional air conditioner.

FIG. 8 is a configuration diagram showing another example of a conventional air conditioner.

[Explanation of symbols]

 2 Compressor 4 Radiator 5 Condenser 10 Water tank 13 Circulation pump 16 Air volume control device 17 Circulation volume control device L2 Cooling water circulation path

Claims (2)

[Claims] 1. An air conditioner comprising a compressor, a condenser, a refrigeration cycle including an evaporator, and a blower for blowing out the cool air obtained by the evaporator, wherein the condenser is housed. In addition, a condenser cooling water tank that cools the condenser with cooling water, and a radiator that is connected to the water tank via a circulation path and radiates cooling water after cooling the condenser. A blower provided in the radiator, a circulation pump provided in the circulation path to circulate cooling water after being radiated by the radiator to the water tank, and cooling in the water tank. An air conditioner comprising: an air volume control device that detects a water temperature and changes the rotation speed of the blower according to the detected temperature to control the air volume. 2. An air conditioner comprising a compressor, a condenser, a refrigeration cycle including an evaporator, and a blower for blowing out the cool air obtained by the evaporator, wherein the condenser is housed. In addition, a condenser cooling water tank that cools the condenser with cooling water, and a radiator that is connected to the water tank via a circulation path and radiates cooling water after cooling the condenser. A blower provided in the radiator, a circulation pump provided in the circulation path to circulate cooling water after being radiated by the radiator to the water tank, and cooling in the water tank. An air conditioner comprising: a circulation amount control device that detects a water temperature and changes the flow rate of the circulation pump according to the detected temperature to control the circulation amount of the cooling water.