JPS62288451A - Heat pump device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a heat pump device using a non-azeotropic mixed refrigerant.

Conventional technology Conventionally, in a heat pump device using a non-azeotropic mixed refrigerant,
It has been proposed to use a refrigerant rectification column to make the refrigerant composition of the main circuit of the refrigeration cycle variable, thereby making it more responsive to loads. Here, a part of the refrigerant in the main circuit is heated with a heater to boil it, and the rectification action in the refrigerant rectification column stores the low-boiling point refrigerant in the reservoir, converting the main circuit into a high-boiling point refrigerant. By making the main circuit rich in high-boiling point refrigerant, or by returning the refrigerant in the reservoir to the main circuit, the heat pump device was able to produce a capacity that corresponds to the load. FIG. 3 shows our prior application as a conventional example of a heat pump device using a refrigerant rectification column.

In the figure, 1 is a compressor, 2 is a condenser, 3 is a main throttling device, and 4 is an evaporator, which are connected by piping to form the main circuit of the refrigeration cycle.

A discharge gas bypass circuit 6 is provided on the discharge side of the compressor 1 via a solenoid valve 7 to enter a heater 5 as a subcircuit. Further, in order to drive the compressor 1, an AC power source 8 is supplied via a frequency converter 9.

The liquid refrigerant exiting the condenser 2 is reduced in pressure to below the saturated liquid level by the first sub-throttle device 10, and is connected to the lower part of the refrigerant rectification column 11 through the heater 5.

The refrigerant rectification column 11 is filled with a filler 12 .

A cooler 13 and a reservoir 14 are connected to the top of the refrigerant rectification tower 11 by a pipe 15, and a pipe 16 that returns from the reservoir 14 to the top of the tower is further connected. A pipe 18 from the lower part of the reservoir 14 via a solenoid valve 17 joins a pipe 19 from the lower part of the refrigerant rectification column 11, and then is connected to the evaporator 4 through a second sub-throttle device 2o. As a cooling source for the cooler 13, suction gas from the compressor 1 or the like is used (not shown).

These circuits are filled with a non-azeotropic mixed refrigerant having an arbitrary composition.

Next, the operation of such a heat pump device will be explained.

When circulating the enclosed refrigerant composition in the main refrigeration cycle, by closing the solenoid valve 7 and opening the solenoid valve 17,
The gas components rising in the refrigerant rectification column 11 pass through the reservoir 14 as they are, flow into the evaporator 4 from the second sub-throttle device 2o, and the rectifying action does not work in the refrigerant rectification column 11, causing the enclosed composition to change. It circulates as it is.

Next, we will discuss the case where the refrigerant is circulated with a composition containing more high boiling point refrigerant than the enclosed composition. By opening the solenoid valve 7 and closing the solenoid valve 17, the liquid refrigerant branched from the condenser 2 is diverted to the first
The sub-throttle device 1o reduces the pressure to below the saturated liquid gland, generates some gas components, and enters the heater 5. The heater 5 generates a gas component that further promotes the separation action, and the gas component enters the refrigerant rectification column 11 and rises. On the other hand, the rising gas is condensed and liquefied in the cooler 13, enters the reservoir 14, passes through the pipe 16, and is refluxed to the top of the tower. The gas rising in the refrigerant rectification column 11 and the liquid descending in the refrigerant rectification column 11 make gas-liquid contact on the surface of the packing material 12 to exchange heat and mass, and the refrigerant with a lower boiling point flows into the reservoir 1.
The refrigerant having a high boiling point is concentrated to a high boiling point and returns to the main cycle from the lower part of the refrigerant rectification column 11 through a pipe 19, and as a result, the main refrigeration cycle side is concentrated to a high boiling point refrigerant.

Generally, if the main circuit is rich in low boiling point components, the capacity increases, and if the main circuit is rich in high boiling point components, the capacity decreases. In this conventional example, when the load increases, the solenoid valve 17 is opened and the solenoid valve 7 is closed, and when the load decreases, the solenoid valve 17 is closed and the solenoid valve 7 is opened, and the refrigerant composition is adjusted as described above. Operate in a manner that varies the capacity to match the load.

In addition, it is also possible to control the capacity by changing the rotation speed of the compressor 1 using the frequency converter 9 and changing the amount of refrigerant circulating in the main circuit. Combined with the effect of changing the refrigerant composition, it is possible to control the capacity. It was possible to operate within the capacity range, that is, within the load range.

Problems to be Solved by the Invention However, such conventional devices have the following drawbacks. That is, when the load is extremely small, the rotation speed of the compressor 1 is lowered to lower the refrigerant circulation amount, and the solenoid valves 7 and 1 are
According to step 7, the main circuit is operated with a composition rich in high boiling point components, but if the rotation speed is lowered too much, the motor torque will decrease, resulting in large torque fluctuations and excessive current, which can lead to motor damage. was there. Additionally, there are limits to the use of high-boiling components in the refrigerant composition, and the system is often operated at a capacity greater than the required load. As a result, the compressor may have to be repeatedly turned on and off, resulting in problems such as low capacity/power values (hereinafter referred to as ERR). Therefore, the present invention improves this conventional drawback and eliminates the need to turn the compressor on and off even under very small loads. This provides a heat pump device that can handle high loads and has a high EER.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to use refrigerant gas that is being drawn into the compressor and being compressed as a heating source for the heater of the refrigerant rectification column. It is used.

action The effect of this technical means is as follows.

In other words, in the process of compressing the suction gas that has flowed into the compressor, a portion of the suction gas is taken out and flowed into the heater as a heating source for the refrigerant rectification column, thereby heating the refrigerant that has flowed into the subcircuit. It performs a rectification action to vary the refrigerant composition. Furthermore, this gas does not pass through the condenser or evaporator and is directly returned to the suction side of the compressor, thereby reducing the refrigerant circulation flowing through the main circuit and reducing the capacity.

Therefore, by varying both the refrigerant composition and the amount of refrigerant circulation, the capacity can be varied over a wide range.

Embodiment An embodiment of the present invention will be explained based on FIG. 1st
In the figure, each component numbered 21 to 4o is
The numbers 1 to 20 in FIG. 2 of the conventional example have the same names and have the same functions, so the explanation will be omitted, but the difference is that in the past, the discharge gas bypass circuit was After leaving the gas, it branches off to the heater 5, and returns to the main circuit again after dissipating the heat. However, in the embodiment of the present invention, the gas discharged while being compressed in the cylinder of the compressor 21 is sent to the heater 26. Discharge gas bypass circuit 26 towards
The return gas is returned to the suction side of the compressor 21 and merged with the main circuit. The inside of the compressor 21 is approximately constructed as shown in FIG.

FIG. 3 is a schematic diagram of a rolling piston compressor commonly used in air conditioners, etc., in which refrigerant flows into the cylinder 42 through the suction gas pipe 41, and the piston 4 rotates.
3 shows that the gas in the shaded area is compressed, but when the solenoid valve 27 is open, the compressed gas flows through the discharge gas bypass circuit 26 until the piston 43 closes the bypass hole 44, as described above. Then, it passes through the heater 25 and returns to the suction side. As soon as the piston 43 passes the bypass hole 44, compression starts, and when a predetermined pressure is reached, the discharge circuit 45
It flows out to the main circuit through. When the solenoid valve 27 is closed, a normal compression process occurs as in the case where the bypass hole 44 is not provided. Therefore, by opening the solenoid valve 27, a part of the inhaled gas does not flow to the main circuit side, and the inhaled gas piping 41
→ Inside the cylinder 42 → Bypass hole 44 → Discharge gas bypass circuit 26 → Solenoid valve 27 → Heater 26 → Suction gas piping 41
As a result, the amount of circulation to the main circuit is reduced and the capacity can be lowered.

Considering the variable capacity of the refrigerant rectification column 31, when the load is large, by closing the solenoid valve 27 and opening the solenoid valve 37, the bypass hole 44 of the compressor 21 is closed and the circulation amount is increased. Furthermore, the capacity is increased because the stored low boiling point refrigerant flows into the main circuit. Conversely, when the load is small, the solenoid valve 27 is opened and the solenoid valve 37 is closed, thereby opening the bypass hole 44 of the compressor 21 and reducing the amount of circulation. Moreover, since the discharged gas discharged from the bypass hole 44 flows into the heater 25, the refrigerant from the first sub-throttle device 30 is heated, and the above-described operation of the refrigerant rectification column 31 causes the refrigerant to flow into the reservoir 34.
Low boiling point refrigerant accumulates in the main circuit, and a large amount of refrigerant rich in high boiling point components flows through the main circuit.

Therefore, a refrigerant rich in high-boiling components is circulated in a reduced amount and flows through the main circuit, and the capacity can be significantly reduced. Moreover, by passing the bypass hole 44, the amount of circulation to the main circuit is reduced and the electric power is reduced accordingly, and the EER does not decrease, so even when the load is very low as in the conventional case, the compressor There is no need to turn on and off 21, and the engine can be operated while maintaining a high ERR. Furthermore, by operating the compressor with a frequency variable device, it is possible to vary the capacity over a wider range, and the range of load response is further expanded.

Effects of the Invention As described above, the present invention uses a non-azeotropic mixed refrigerant and uses a part of the refrigerant gas in the middle of compression in the compressor as a heating source for the refrigerant rectification column, so it can handle a wide range of loads without reducing the EER. It is possible to generate abilities corresponding to In particular, when the load is small, JEE
It is possible to achieve an improvement in H.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram showing an embodiment of the heat pump device of the present invention, Fig. 2 is a schematic diagram showing the inside of the compressor in Fig. 1, and Fig. 3 is a refrigerant circuit of a conventional heat pump device. It is a diagram. 1.21... Compressor, 5, 25... Heater, 6.26... Discharge gas bypass circuit, 7
,17゜27.37...Solenoid valve, 11, 31
・Former...Refrigerant rectification tower, 14.34...Reservoir,
44...Bypass hole. 2I-Pressure" [Minimum 22-m-Condenser 24-Black gas supply 25-# #姑z7----Discharge gas bypass valve 33--11 Refrigerant #2 unit 34--Oruro 2nd figure

Claims (1)

[Claims] A non-azeotropic mixed refrigerant is used as a thermal refrigerant, a compressor, a condenser, a main throttling device, an evaporator, etc. are connected in a ring to form a main circuit, and a refrigerant rectification column stores the refrigerant separated from the rectification column. A sub-circuit including a reservoir and a heater for heating the non-azeotropic mixed refrigerant led from the main circuit to the rectification column is connected to the main circuit, and as a heat source for the heater, a sub-circuit is connected to the main circuit. A heat pump device characterized by using refrigerant gas in the middle of compression.