JPS62280557A - Heat pump type air conditioner - 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 type air conditioner that uses a non-azeotropic mixed refrigerant and is equipped with a variable frequency device.

BACKGROUND OF THE INVENTION In recent years, heat pump refrigeration systems that use non-azeotropic mixed refrigerants and whose capacity can be varied have been developed.

An example of the conventional heat pump type refrigeration system mentioned above will be described below with reference to the drawings.

FIG. 5 shows a circuit diagram of a conventional heat pump type refrigeration system using a non-azeotropic mixed refrigerant.

In FIG. 5, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 and 5 are pressure reducing devices, and 6 is an indoor heat exchanger. Further, a conduit 7 is branched between the pressure reducing devices 4 and 5, and this conduit 7 is connected to a first refrigerant container 8.

This first refrigerant container 8 includes a pressure reducing device 5 and an indoor heat exchanger 6.
It surrounds the piping that connects the A second refrigerant container 9 surrounds a pipe connecting the outdoor heat exchanger 3 and the pressure reducing device 4, and is connected to the conduit 7 via an on-off regulating valve 10. This refrigeration cycle uses a non-azeotropic mixed refrigerant.

The operation of the heat pump type refrigeration system configured as described above will be explained below.

First, during cooling operation, the refrigerant flows in the direction of the solid arrow shown in the figure. Here, the on-off regulating valve 10 is closed, and the conduit 7
The refrigerant separated by the flow reaches the first refrigerant container 8, but since the piping connecting the pressure reducing device 5 surrounded by the first refrigerant container 8 and the indoor heat exchanger 6 is at a low temperature during cooling operation, the refrigerant flows into the first refrigerant container 8.
The refrigerant container 8 is cooled, high boiling point components are stored in liquid form inside the container, and low boiling point components flow through the refrigeration cycle.

On the other hand, during heating operation in a state where the on-off regulating valve 1o is closed, the refrigerant flows in the direction of the dashed arrow shown in the figure. Here, since the first refrigerant container 8 is heated by the high-temperature refrigerant liquefied in the indoor heat exchanger 6, the refrigerant circulates through the refrigeration cycle without being liquefied and stored in the first refrigerant container B. In this case, the refrigerant 1l-j in the refrigeration cycle: a mixed refrigerant flows, and the refrigeration cycle capacity during heating is improved compared to the refrigeration cycle during cooling.

In addition, during heating operation, if the opening/closing adjustment valve 1o is operated when there is surplus heating capacity, the high boiling point components are guided to the second refrigerant container 9 and stored, thereby reducing the heating capacity (for example, 57-31056).

Problems to be Solved by the Invention However, the above configuration has a problem in that timing settings for varying the mixing ratio of the high boiling point component and the low boiling point component to vary the capacity are not specific.

In view of the above problems, the present invention provides a heat pump air conditioner that is equipped with a refrigerant mixing ratio variable device and a frequency variable device, and is capable of accurately detecting the load based on the compressor operating frequency and efficiently controlling the capacity in cooling and heating operations. It provides:

Means for Solving the Problems In order to solve the above problems, the heat pump type air conditioner of the present invention uses a non-azeotropic mixed refrigerant, is equipped with a variable frequency device, and has a compressor, a four-way valve, and an outdoor heat exchanger. A main circuit of the refrigeration cycle is constructed by sequentially connecting a main circuit pressure reducer, an indoor heat exchanger, and a heater is provided between the discharge side of the compressor and the four-way valve. A cooler is provided in the middle of the four-way valve, and the intermediate part of the outdoor heat exchanger and the main circuit pressure reducer is connected to the bottom of the rectification column packed with filler through the heater and via a check valve. At the same time, a pressure reducer is provided in parallel with the heater and the check valve, and an intermediate between the check valve and the bottom of the rectification column and the bottom of the refrigerant reservoir are connected via an electromagnetic shut-off valve,
Further, the indoor heat exchanger, an intermediate portion of the pressure reducer of the main circuit, and the bottom of the rectification column are connected through the heater and via a check valve, and are connected in parallel to the heater and the check valve. a pressure reducer is provided in the rectifier, further connecting the top of the rectification column and the top of the refrigerant reservoir through the cooler, and connecting the top of the rectification column and the bottom of the refrigerant reservoir. A variable refrigerant composition ratio cycle is configured as a whole, including a frequency detection means for detecting the frequency of the compressor, a comparison means for comparing the frequency detected by the frequency detection means and a set frequency, and a frequency detection means for comparing the frequency determined by the frequency detection means with a set frequency, and If the frequency is higher than the set frequency, the electromagnetic on-off valve is switched to the first output mode, and when the frequency is smaller than the set frequency, the electromagnetic on-off valve is switched to the second output mode. It is equipped with an output means for outputting an electrical signal.

Effect The present invention has the above-described configuration, accurately grasps the load for both heating and cooling, separates the low boiling point refrigerant component of the non-azeotropic mixed refrigerant according to the required load, and changes the refrigerant mixing ratio.
Enables a wide range of efficient capacity control operations.

EXAMPLE Hereinafter, a heat pump type air conditioner according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram of the present invention. compressor 11,
Four-way valve 12, outdoor heat exchanger 13, main circuit pressure reducer 14,
Indoor heat exchangers 15 are connected in series. In addition, the intermediate portion between the outdoor heat exchanger 13 and the pressure reducer 14 and the bottom of the rectification column 16 pass through the heater 17 and are connected via the check valve 18, and a first pressure reducer is connected in parallel to the heater 17 and the check valve 18. A container 19 is provided, and an intermediate between the check valve 18 and the bottom of the rectification column 16 is connected to the bottom of the refrigerant reservoir 20 via an electromagnetic on-off valve 21.
In addition, the intermediate between the indoor heat exchanger 15 and the main circuit pressure reducer 14 and the bottom of the rectification column 16 are connected through the heater 17 and via the check valve 22, and are connected in parallel to the heater 17 and the check valve 22. A pressure reducer 23 is provided at the top of the rectification column 16 and the top of the refrigerant reservoir 20, and a cooler 24 is passed through the top of the rectification column 16 and the top of the refrigerant reservoir 20 to connect the top of the rectification column 16 and the bottom of the refrigerant reservoir 2o. Here, the refrigerant used in the refrigeration cycle of the present invention is a non-azeotropic mixed refrigerant that is a mixture of a plurality of refrigerants having different boiling point capacities.

Now, to explain the relationship between the block circuit shown in FIG. 2 and the control circuit shown in FIG. 3, the frequency detection device 27 shown in FIG. 3 corresponds to the frequency detection means shown in FIG.
The comparator 25 shown in the figure corresponds to the comparison means in FIG. 2, the microcomputer 26 in FIG. 3 corresponds to the transition means in FIG. 2, and the output circuit 28 in FIG. 3 corresponds to the output means in FIG. It is equivalent.

Next, the operation of the control circuit having the above configuration will be explained with reference to FIGS. 1 to 4.

During heating operation, the compressor frequency is detected by the frequency detection device 27 and compared with the set frequency stored in the microcomputer 26. If the frequency is higher than the set frequency, the refrigerant flows as shown by the solid arrow in FIG. Since the on-off valve 21 is open, the refrigerant in the refrigerant reservoir 20 also flows in the same way as in the main circuit, so the composition of the refrigerant in the refrigerant reservoir 2o is not different from that in the main circuit, and is composed of high boiling point components and low boiling point components. High capacity can be obtained with a mixture of components.

On the other hand, when the compressor frequency decreases and becomes smaller than the set frequency, the electromagnetic on-off valve 21 closes and the refrigerant flows as indicated by the dotted arrow. A portion of the subcooled refrigerant leaving the indoor heat exchanger 15 enters the heater 17 and is heated by the discharged gas to generate gas components, which then enter the rectification column 16. The gas components of the refrigerant that entered the rectification column 16 rise through the column and enter the cooler 24.
Here, it is cooled and liquefied by the suction gas and guided to the refrigerant reservoir 20, and a part of it is refluxed to the top of the rectification column where it comes into gas-liquid contact with the gas components rising in the column, thereby performing mass transfer and heat exchange. . By repeating this cycle, the refrigerant in the refrigerant reservoir 20 will have more low-boiling point components, and the composition of the refrigerant flowing through the main circuit will be in a state where there are many high-boiling point components, reducing both capacity and power consumption, allowing efficient capacity control. can. The same holds true during cooling operation.

As described above, according to this embodiment, the frequency detection bag #27 is installed to vary the ratio of the non-azeotropic mixed refrigerant depending on the magnitude of the compressor operating frequency. A refrigerant with high boiling point and low boiling point components can be mixed to achieve high capacity, and when the load is small and operation is performed at low frequency, the refrigerant with low boiling point components is separated and stored, and the refrigerant in the main circuit is mixed with high boiling point components. As a result, small capacity and low power consumption can be obtained, and efficient capacity control can be easily performed.

Effects of the Invention As described above, the present invention uses a non-azeotropic mixed refrigerant, is equipped with a frequency variable device, and sequentially connects a compressor, a four-way valve, an outdoor heat exchanger, a main circuit pressure reducer, and an indoor heat exchanger. to constitute the main circuit of the refrigeration cycle, a heater is provided between the discharge side of the compressor and the four-way valve, a cooler is provided between the suction side of the compressor and the four-way valve, and the outdoor heat exchanger The middle of the pressure reducer for the main circuit and the bottom of the rectification column filled with filler are connected through the heater and via a check valve, and a first A pressure reducer is provided, and an intermediate between the check valve and the bottom of the rectification column is connected to the bottom of the refrigerant reservoir via an electromagnetic shut-off valve, and a pressure reducer is provided between the indoor heat exchanger and the main circuit pressure reducer. and the bottom of the rectification column are connected to each other through a check valve passing through the heater, and a pressure reducer is provided in parallel to the heater and the check valve, and the top of the rectification column and the refrigerant storage The top of the rectifier is connected through the cooler, the top of the rectifier is connected to the bottom of the refrigerant reservoir to form a refrigerant composition ratio variable cycle, and the frequency of the compressor is detected. a frequency detection means; a comparison means for comparing the frequency of the frequency detected by the frequency detection means with a set frequency; By providing a transition means for shifting to an output mode in which the electromagnetic on-off valve is closed, and an output means for outputting an electric signal to the electromagnetic on-off valve in the output mode, it is possible to accurately grasp the load in both cooling and heating operations and respond to the required load. By separating or mixing the low boiling point components of the non-azeotropic mixed refrigerant and varying the mixing ratio of the refrigerant flowing through the main circuit, a wide range of efficient capacity control operations can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of a heat pump air conditioner according to an embodiment of the present invention, Fig. 2 is a block diagram of the same, and Fig.
The figure is the same control circuit diagram, Figure 4 is the same flow chart, and Figure 5 is the same control circuit diagram.
The figure is a refrigeration cycle diagram of a conventional heat pump type air conditioner. 16... Rectification column, 17... Heater, 18.
22...Check valve, 19.23...Reducer, 20...Refrigerant reservoir, 21...Solenoid shut-off valve, 24...Cooler, 25 ...Comparator, 26...Microcomputer, 2A...
...Frequency detection-equipment. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure z6°°° Comparator Z8 - Output circuit Figure 3 Figure 4

Claims (1)

[Claims] Using a non-azeotropic mixed refrigerant, equipped with a variable frequency device, the main circuit of the refrigeration cycle is constructed by sequentially connecting a compressor, four-way valve, outdoor heat exchanger, main circuit pressure reducer, and indoor heat exchanger, A heater is provided between the discharge side of the compressor and the four-way valve, a cooler is provided between the suction side of the compressor and the four-way valve, and a heater is provided between the outdoor heat exchanger and the main circuit pressure reducer and the filling A first pressure reducer is provided in parallel to the heater and the check valve, and a first pressure reducer is provided in parallel to the heater and the check valve. The middle of the bottom of the rectification tower and the bottom of the refrigerant reservoir are connected via an electromagnetic on-off valve, and the middle of the indoor heat exchanger and the pressure reducer of the main circuit and the bottom of the rectification tower are connected to the bottom of the rectification tower. A pressure reducer is provided in parallel to the heater and the check valve, and is connected to the heater through the check valve.
Further, the top of the rectification column and the top of the refrigerant reservoir are connected through the cooler, and the top of the rectification column and the bottom of the refrigerant reservoir are connected to form a variable refrigerant composition ratio cycle. a frequency detecting means for detecting the frequency of the compressor; a comparing means for comparing the frequency detected by the frequency detecting means with a set frequency; Transition means for shifting to a first output mode for opening the valve and, if the frequency is lower than a set frequency, for shifting to a second output mode for closing the electromagnetic on-off valve; and output means for outputting an electrical signal to the electromagnetic on-off valve in accordance with the output mode. A heat pump air conditioner equipped with