JPH06193975A - Refrigerating cycle - Google Patents

Abstract

PURPOSE:To provide a refrigerating cycle in which cooling capacity is improved and a discharge gas temperature of a compressor is lowered in the cycle in which many capillaries are used instead of expansion valves of an air conditioner, a refrigerator, etc. CONSTITUTION:An injection circuit is formed by connecting a solenoid valve 8 to be controlled according to a discharge tube temperature of a compressor 1 to a second capillary 7 is formed at a return side of the compressor 1 between a dryer 4 and a first capillary 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle for air conditioning equipment, refrigeration equipment and other refrigerators.

[0002]

2. Description of the Related Art Conventionally, as a measure for lowering the discharge gas temperature of a compressor in a refrigeration cycle of this type, a so-called liquid refrigerant is used in which a liquid refrigerant in a condenser is guided to a compressor by using an injection circuit composed of only capillaries. There is an injection method. An embodiment of a conventional refrigeration cycle will be described below with reference to the drawings with reference to FIG.

In the figure, reference numeral 1 denotes a compressor, which is connected to a condenser 3 by a discharge pipe 2, and is further connected to a dryer 4, a first capillary 5 and an evaporator 6 in this order. Further, it has an injection circuit formed by connecting the second capillary 7 to the inflow side of the compressor 1 from between the dryer 4 and the first capillary 5.

The operation of the refrigerating cycle configured as described above will be described below with reference to FIG. 9 focusing on the flow of the refrigerant. First, the high-temperature and high-pressure discharge gas produced by the compressor 1 is guided to the condenser 3 through the discharge pipe 2 and becomes a low-temperature and high-pressure liquid refrigerant state. Further, the low-temperature high-pressure liquid refrigerant is dried and depressurized through the dryer 4 and the first capillary 5, is guided to the evaporator 6, and is evaporated, whereby a cooling effect is obtained.
Further, the evaporated refrigerant returns to the compressor 1 and is compressed again. Further, the injection circuit formed by the second capillary 7 adjusts the flow rate of the liquid refrigerant that has passed through the dryer 4 and is dried at low temperature and high pressure, and returns to the compressor 1 to be compressed again.

[0005]

However, in the above-mentioned configuration, the first capillary 5 and the second capillary 7 are affected by fluctuations in the outside air temperature, fluctuations in the cooling load of the evaporator 6, fluctuations in the cooling capacity of the condenser 3, and the like. Since the ratio of the refrigerant flowing through the tank is not constant, the discharge gas temperature is not constant. Also, when the outside temperature is low, the discharge gas temperature is low,
Although the injection circuit is not necessary, the refrigerant flows to the compressor 1 via the second capillary 7, the condensing pressure of the condenser 3 is low, and the flow rate of the refrigerant flowing through the first capillary 5 is decreased. There is a drawback that the flow rate of the refrigerant flowing through the second capillary 7 increases and the cooling capacity of the evaporator 6 decreases.

The present invention is intended to solve the above problems, and a first object of the present invention is to provide a refrigeration cycle in which the discharge pipe temperature can be kept constant. A second object is to provide a refrigeration cycle capable of detecting the discharge pipe pressure and keeping the discharge gas temperature constant.

A third object is to provide a refrigeration cycle capable of detecting the condenser temperature and keeping the discharge gas temperature constant. A fourth object is to provide a refrigeration cycle capable of detecting the condenser pressure and keeping the discharge gas temperature constant.

A fifth object is to provide a refrigeration cycle capable of detecting the compressor temperature and keeping the discharge gas temperature constant. A sixth object is to provide a refrigeration cycle capable of detecting the ambient temperature and keeping the discharge gas temperature constant.

A seventh object is to provide a refrigeration cycle capable of detecting the oil level of the compressor and keeping the discharge gas temperature constant. An eighth object is to provide a refrigeration system capable of detecting the liquid surface level of the liquid reservoir and keeping the discharge gas temperature constant.

[0010]

In order to achieve the above first object, a refrigerating cycle of the present invention comprises a compressor, a condenser, a dryer, a first capillary and an evaporator, which are sequentially connected to each other, and An injection circuit is formed by connecting an electromagnetic valve controlled by the discharge pipe temperature of the compressor and a second capillary to the return side of the compressor between the first capillary and the first capillary.

In order to achieve the second object, a solenoid valve controlled by the discharge pressure of the compressor and a second capillary are provided on the return side of the compressor from between the dryer and the first capillary. This is a configuration of an injection circuit formed by connecting.

Further, in order to achieve the third object, between the dryer and the first capillary on the return side of the compressor,
The injection circuit is configured by connecting an electromagnetic valve controlled by the condenser temperature and a second capillary.

In order to achieve the fourth object, between the dryer and the first capillary, on the return side of the compressor,
The injection circuit is configured by connecting an electromagnetic valve controlled by the condenser pressure and a second capillary.

Further, in order to achieve the fifth object, between the dryer and the first capillary, on the return side of the compressor,
The injection circuit is configured by connecting an electromagnetic valve controlled by the compressor temperature and a second capillary.

In order to achieve the sixth object, between the dryer and the first capillary, on the return side of the compressor,
The injection circuit is configured by connecting an electromagnetic valve controlled by the ambient temperature of the refrigeration cycle and a second capillary.

In order to achieve the seventh object, between the dryer and the first capillary, on the return side of the compressor,
The injection circuit is configured by connecting a solenoid valve controlled by the oil level of the compressor and a second capillary.

In order to achieve the eighth object, a liquid reservoir is provided between the condenser and the dryer, and a liquid level of the liquid reservoir is provided between the dryer and the first capillary to the return side of the compressor. The injection circuit is configured by connecting the solenoid valve controlled by the second capillary and the second capillary.

[0018]

According to the present invention, in the above-mentioned structure, the injection valve is opened and closed by the solenoid valve controlled by the discharge gas temperature of the compressor to prevent the change of the ratio of the refrigerant flowing through the first capillary and the second capillary, thereby preventing the discharge gas temperature Is to stabilize.

Further, the injection circuit is opened and closed by a solenoid valve controlled by the discharge gas pressure of the compressor to prevent fluctuations in the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas temperature. .

Further, the injection circuit is opened and closed by a solenoid valve controlled by the condensing temperature to prevent variation in the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas temperature.

Further, the injection circuit is opened and closed by the solenoid valve controlled by the condensing pressure to prevent the change in the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas temperature.

Further, the injection circuit is opened and closed by a solenoid valve controlled by the temperature of the compressor to prevent variation in the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas.

The solenoid valve controlled by the ambient temperature of the refrigeration cycle opens and closes the injection circuit to
This is to prevent fluctuations in the ratio of the refrigerant flowing through the capillaries and the second capillaries and stabilize the discharge gas temperature.

Further, the solenoid valve controlled by the oil level of the compressor opens and closes the injection circuit to prevent fluctuations in the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas temperature. is there.

Further, the solenoid valve controlled by the liquid level of the liquid reservoir opens and closes the injection circuit to prevent the fluctuation of the ratio of the refrigerant flowing through the first and second capillaries and stabilize the discharge gas temperature. is there.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the conventional one are denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1, reference numeral 8 is a solenoid valve, and a temperature detector 9 for controlling the opening / closing of the solenoid valve 8 is attached to the discharge pipe 2. The operation of the refrigeration cycle configured as above will be described below. When the outside air temperature changes to a low outside air temperature, the discharge gas temperature decreases and the temperature of the discharge pipe 2 also decreases. This temperature is detected by the temperature detecting unit 9, and the electromagnetic valve 8 is closed by the detection signal to close the injection circuit. Further, when the outside air temperature becomes high, the discharge gas temperature rises and the temperature of the discharge pipe 2 also rises. This temperature is detected by the temperature detection unit 9, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity and
When the outside air temperature is high, the injection circuit is opened to lower the discharge gas temperature.

Next, a second embodiment will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Figure 2
In the figure, 8 is a solenoid valve, and a pressure detection unit 10 for controlling the opening / closing of the solenoid valve is attached to the discharge pipe 2.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the discharge gas pressure decreases. This pressure is detected by the pressure detection unit 10, the electromagnetic valve 8 is closed by the detection signal, and the injection circuit is closed. Further, when the outside air temperature becomes high, the discharge gas pressure rises. This pressure is detected by the pressure detection unit 10, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity, and the injection circuit is opened at a high outside air temperature to lower the discharge gas temperature.

Next, a third embodiment will be described with reference to FIG. The same components as those in the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Figure 3
In the above, reference numeral 8 is a solenoid valve, and a temperature detection unit 11 for controlling the opening / closing of the solenoid valve is attached to the condenser 3.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the condensed gas temperature decreases. This temperature is detected by the temperature detection unit 11, the electromagnetic valve 8 is closed by the detection signal, and the injection circuit is closed. Further, when the outside air temperature becomes high, the condensed gas temperature rises. This temperature is detected by the temperature detection unit 11, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity and
When the outside air temperature is high, the injection circuit is opened to lower the discharge gas temperature.

Next, a fourth embodiment will be described with reference to FIG. The same components as those in the third embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Figure 4
In the figure, 8 is a solenoid valve, and the pressure detection unit 12 for controlling the opening and closing thereof is attached to the condenser 3.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the condenser gas pressure decreases. This pressure is detected by the pressure detection unit 12, and the electromagnetic valve 8 is closed by the detection signal to close the injection circuit. Further, when the outside air temperature becomes high, the condensed gas pressure rises. This pressure is detected by the pressure detection unit 12, the electromagnetic valve 8 is opened by the detection signal, and the injection circuit is opened. According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity, and the injection circuit is opened at a high outside air temperature to lower the discharge gas temperature.

Next, a fifth embodiment will be described with reference to FIG. The same components as those in the fourth embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Figure 5
In the figure, 8 is a solenoid valve, and the temperature detection unit 13 for controlling the opening and closing thereof is attached to the compressor 1.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the temperature of the compressor 1 decreases. This temperature is detected by the temperature detection unit 13, and the electromagnetic valve 8 is closed by the detection signal,
Close the injection circuit. Further, when the outside air temperature becomes high, the temperature of the compressor 1 rises. This temperature is detected by the temperature detection unit 13, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to the present embodiment, the injection circuit is closed at low ambient temperature to improve the cooling capacity, and
When the outside air temperature is high, the injection circuit is opened to lower the discharge gas.

Next, a sixth embodiment will be described with reference to FIG. The same components as those in the fifth embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Figure 6
In the above, reference numeral 8 is a solenoid valve, and the temperature detection unit 14 for controlling the opening / closing of the solenoid valve is fixed to the ambient temperature detection unit of the refrigeration cycle.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the ambient temperature of the refrigeration cycle decreases. This temperature is detected by the temperature detection unit 14, and the solenoid valve 8 is detected by the detection signal.
To close the injection circuit. Further, when the outside air temperature becomes high, the ambient temperature of the refrigeration cycle rises.
This temperature is detected by the temperature detection unit 14, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity and
When the outside air temperature is high, the injection circuit is opened to lower the discharge gas temperature.

Next, a seventh embodiment will be described with reference to FIG. The same components as those of the sixth embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In FIG. 7, reference numeral 8 is a solenoid valve, and an oil level detector 15 for controlling the opening / closing of the solenoid valve is attached to the compressor 1.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the oil level of the compressor 1 rises. The rise of the oil level is detected by the oil level detector 15, and the electromagnetic valve 8 is closed by the detection signal to close the injection circuit.
Further, when the outside temperature becomes high, the oil level of the compressor 1 decreases. This decrease in oil level is detected by the oil level detector 15
Then, the solenoid valve 8 is opened by the detection signal and the injection circuit is opened.

According to this embodiment, the injection circuit is closed at the time of low outside air temperature to improve the cooling capacity and
When the outside air temperature is high, the injection circuit is opened to lower the discharge gas temperature.

Next, an eighth embodiment will be described with reference to FIG. The same components as those in the embodiment of FIG. 7 are designated by the same reference numerals and detailed description thereof will be omitted. Figure 8
In the figure, 16 is a liquid reservoir, and the condenser 3 and the dryer 4
It is provided between Reference numeral 8 is a solenoid valve, and a refrigerant liquid level detector 17 is attached to the liquid reservoir 16 for controlling the opening and closing thereof.

The operation of the refrigerating cycle configured as described above will be described below. When the outside air temperature changes to a low outside air temperature, the liquid level of the refrigerant in the liquid reservoir 16 rises.
The coolant liquid level detector 17 detects this rise in the coolant liquid level, and the electromagnetic valve 8 is closed by the detection signal to close the injection circuit. Also, when the outside temperature becomes high,
The liquid level of the refrigerant of No. 6 is lowered. The coolant liquid level detector 17 detects this drop in the coolant liquid level, and the electromagnetic valve 8 is opened by the detection signal to open the injection circuit.

According to this embodiment, the injection circuit is closed at a low outside air temperature to improve the cooling capacity, and the injection circuit is opened at a high outside air temperature to lower the discharge gas temperature.

[0049]

As is apparent from the above description of the embodiments, the present invention is constructed by forming an injection circuit in which a solenoid valve controlled by the temperature of the discharge pipe of a compressor and a second capillary are connected. While the injection circuit is closed at a low outside air temperature to improve the cooling capacity, the injection circuit is opened at a high outside air temperature to lower the discharge gas temperature.

Further, according to the present invention, the injection circuit is formed by connecting the electromagnetic valve controlled by the pressure of the discharge pipe of the compressor and the second capillary, so that the injection circuit is closed at a low outside air temperature and the cooling capacity is improved. The temperature of the discharged gas is lowered by opening the injection circuit when the outside air temperature is high.

Further, according to the present invention, the injection circuit is constructed by connecting the solenoid valve controlled by the temperature of the condenser and the second capillary, so that the injection circuit is closed at a low outside air temperature to improve the cooling capacity. In addition, the injection circuit is opened when the outside air temperature is high to lower the discharge gas temperature.

Further, according to the present invention, the injection circuit is constructed by connecting the solenoid valve controlled by the pressure of the condenser and the second capillary, so that the injection circuit is closed at a low outside air temperature to improve the cooling capacity. In addition, the injection circuit is opened when the outside air temperature is high to lower the discharge gas temperature.

Further, according to the present invention, the injection circuit is constructed by connecting the electromagnetic valve controlled by the temperature of the compressor and the second capillary, so that the injection circuit is closed at a low outside air temperature to improve the cooling capacity. In addition, the injection circuit is opened when the outside air temperature is high to lower the discharge gas temperature.

Further, according to the present invention, by forming an injection circuit in which a solenoid valve controlled by the ambient temperature of the refrigeration cycle and a second capillary are connected, the injection circuit is closed at a low outside air temperature to improve the cooling capacity. In addition to improving the temperature, the temperature of the discharged gas is lowered by opening the injection circuit when the outside air temperature is high.

Further, according to the present invention, by forming an injection circuit in which a solenoid valve controlled by the oil level of the compressor and a second capillary are connected to each other, the injection circuit is closed at a low outside air temperature to provide a cooling capacity. The temperature of the discharged gas is lowered by opening the injection circuit when the outside air temperature is high.

Further, according to the present invention, the injection circuit is constructed by connecting the solenoid valve controlled by the liquid level of the refrigerant in the liquid reservoir and the second capillary, thereby closing the injection circuit at low outside air temperature and cooling capacity. The temperature of the discharged gas is lowered by opening the injection circuit when the outside air temperature is high.

As described above, since the solenoid valve is controlled to be opened / closed by picking up the variation value of each component in the refrigeration cycle, the structure is simple, and the cooling capacity is improved and the discharge gas temperature of the compressor is surely lowered. It is possible and its effect is great.

[Brief description of drawings]

FIG. 1 is a piping diagram of a refrigeration cycle according to a first embodiment of the present invention.

FIG. 2 is a piping diagram of a refrigeration cycle according to a second embodiment of the present invention.

FIG. 3 is a piping diagram of a refrigeration cycle according to a third embodiment of the present invention.

FIG. 4 is a piping diagram of a refrigerating cycle according to a fourth embodiment of the present invention.

FIG. 5 is a piping diagram of a refrigeration cycle according to a fifth embodiment of the present invention.

FIG. 6 is a piping diagram of a refrigeration cycle according to a sixth embodiment of the present invention.

FIG. 7 is a piping diagram of a refrigerating cycle according to a seventh embodiment of the present invention.

FIG. 8 is a piping diagram of a refrigerating cycle according to an eighth embodiment of the present invention.

FIG. 9 is a piping diagram of a conventional refrigeration cycle.

[Explanation of symbols]

 1 Compressor 2 Discharge Pipe 3 Condenser 4 Dryer 5 First Capillary 6 Evaporator 7 Second Capillary 8 Solenoid Valve 16 Liquid Reservoir

Claims (8)

[Claims] 1. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected to each other, and a discharge pipe of the compressor is provided between the dryer and the first capillary and on the return side of the compressor. A refrigeration cycle provided with an injection circuit formed by connecting a temperature-controlled solenoid valve and a second capillary. 2. A compressor, a condenser, a dryer, a first capillary, and an evaporator are sequentially connected, and a discharge pressure of the compressor is controlled to a return side of the compressor from between the dryer and the first capillary. Refrigeration cycle provided with an injection circuit formed by connecting a solenoid valve to a second capillary. 3. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected to each other, and between the dryer and the first capillary, on the return side of the compressor, an electromagnetic controlled by the temperature of the condenser. A refrigeration cycle provided with an injection circuit formed by connecting a valve and a second capillary. 4. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected to each other, and between the dryer and the first capillary, on the return side of the compressor, an electromagnetic controlled by the condenser pressure. A refrigeration cycle provided with an injection circuit formed by connecting a valve and a second capillary. 5. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected to each other, and between the dryer and the first capillary, on the return side of the compressor, an electromagnetic controlled by the compressor temperature. A refrigeration cycle provided with an injection circuit formed by connecting a valve and a second capillary. 6. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected to each other, and between the dryer and the first capillary, on the return side of the compressor, controlled at the ambient temperature of the refrigeration cycle. Refrigeration cycle provided with an injection circuit formed by connecting a solenoid valve and a second capillary. 7. A compressor, a condenser, a dryer, a first capillary, and an evaporator are sequentially connected, and the return side of the compressor is located between the dryer and the first capillary, and the oil level of the compressor is controlled. Refrigeration cycle provided with an injection circuit formed by connecting a solenoid valve to a second capillary. 8. A compressor, a condenser, a dryer, a first capillary and an evaporator are sequentially connected, a liquid reservoir is provided between the condenser and the dryer, and a liquid is provided between the dryer and the first capillary. A refrigeration cycle in which an injection circuit formed by connecting a solenoid valve controlled by a liquid level of a liquid reservoir and a second capillary is provided on the return side of the compressor.