JPS6048456A - 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 Field of Application of Industry-I- The present invention relates to a heat pump device that uses a non-azeotropic mixed refrigerant and performs capacity control by changing the concentration of refrigerant circulating in a cycle.

Conventional Structure and Problems One of the superior performance control methods for conventional heat pump devices is an inverter type that changes the amount of refrigerant circulation by changing the rotational speed of the compressor. However, this method has the disadvantage of requiring an expensive inverter circuit and increasing costs.Also, when using a heat pump device as a heating/cooling type air conditioner, the device must be designed according to its cooling capacity. There is a problem that during heating, the capacity is insufficient and the system is interrupted.

Therefore, in recent years, a heat pump device has been proposed that uses a non-azeotropic mixed refrigerant as the refrigerant and performs capacity control by changing the concentration of the refrigerant circulating in the cycle.

This is because the specific volume of refrigerant vapor in the compressor suction section varies depending on the concentration of low boiling point components in the mixed refrigerant, and the circulating amount of refrigerant can be changed even at the same rotation speed of the compressor. be. That is, when increasing the capacity of the heat pump device, a refrigerant with a high concentration of low boiling point components may be circulated within the cycle, and when decreasing the capacity, a refrigerant with a low concentration of low boiling point components may be circulated. Figure 1 shows a conventional example of a heat pump device that uses a non-azeotropic mixed refrigerant to control capacity changes and is used as a full heating and cooling type air conditioner.

The operation of the heat pump device configured as described above will be explained. First, during heating, the open/close switch yf13 is closed, and the refrigerant vapor discharged from the compressor 1 is condensed in the user-side heat exchanger 3 via the four-way valve 2 to exert a heating effect, and then the check valve 5. Passes through a gas-liquid separator 6, a heating throttle device 7,
The heat source side heat exchanger 9 removes heat from the surroundings, evaporates it, and returns to the compressor 1 via the four-way valve 2.

Next, during cooling, the four-way valve 2 is switched to open the on-off valve 13, and the refrigerant vapor discharged from the compressor 1 is released and condensed in the heat source side heat exchanger via the four-way valve 2, and then passes through the check valve 8. It is led to the gas-liquid separator 6.

Here, the refrigerant is separated into vapor with a high concentration of low boiling point components and liquid with a low concentration, and the vapor is separated between the upper part of the gas-liquid separator 6 and the refrigerant container 1.
The refrigerant flows into the refrigerant container 10 through a conduit 11 that connects the refrigerant to the refrigerant container 10.

In addition, the liquid passes through the cooling throttling device 4, and most of the refrigerant evaporates in the user-side heat exchanger 3 and returns to the compressor 1 via the four-way valve 2 after exerting a cooling effect. The refrigerant container 10 is cooled by the heat exchanger 14 which passes through the on-off valve 13 and passes through the bypass pipe 12 to exchange heat with the refrigerant container 10, and then the compressor 1
Return to

Therefore, during cooling, the refrigerant vapor with a high concentration of low-boiling components separated by the gas-liquid separator 6 condenses and accumulates in the refrigerant container 10, and while the refrigerant circulates in the cycle, it also flows into the refrigerant container 10 during heating. is filled with vapor having a high concentration of low boiling point components, but since the refrigerant container 10 is not cooled, the vapor does not condense, and therefore the concentration of the refrigerant that circulates throughout the cycle is approximately equal to the filled concentration. As a result, by configuring the circuit as shown in FIG. 1 using a non-azeotropic mixed refrigerant, the performance during heating can be made higher than during cooling.

However, with the above configuration, although it is possible to provide a difference in capacity between cooling and heating, it is difficult to demonstrate the appropriate capacity in response to load fluctuations in each case, and it is difficult to achieve an appropriate capacity in response to load fluctuations in each case. Yes, it's difficult.

Purpose of the Invention The present invention, when applied to a cooling/heating type air conditioner, for example, provides a heat generating system that can exert and control the capacity according to the load without using an expensive inverter circuit, regardless of whether it is used for cooling or heating. An object of the present invention is to provide a pump device.

Structure of the Invention The present invention forms a heat pump using a refrigerant container as a component that can exchange heat with both the heat exchanger piping on the user side and the heat exchanger piping on the heat source side.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that FIGS. 1 and 2, in which the same components as in FIG. 1 are designated with the same symbol, are schematic configuration diagrams of an embodiment in which the heat pump device of the present invention is applied to a heating/cooling type air conditioner. In Figure 2, 1 to 11 are the same components as in Figure 1, and 1 to 11 are the same components as in Figure 1.
6, 16, 17 are on-off valves, 18 is a bypass pipe provided in parallel to the heat exchanger piping on the user side, 19 is a bypass pipe provided in parallel to the heat exchanger piping on the heat source side, 2o is bypass pipe 1
8 is a heat exchanger that exchanges heat with the refrigerant container 10 , and 21 is a heat exchanger that is located in the middle of the bypass pipe 19 and exchanges heat with the refrigerant container 10 .

The operation of the heat pump configured as described above will be explained below. First, during normal heating, the on-off valves 15, 16.
17 is closed, and the refrigerant is supplied to the compressor 1, four-way valve 2. User side heat exchanger 3. Check valve6. Gas-liquid separator6. Heating diaphragm device7. It circulates through the heat source side heat exchanger 9 and the four-way valve 2, returns to the compressor 1, radiates heat in the usage side heat exchanger 3, and absorbs heat in the heat source side heat exchanger 9.

In addition, during normal cooling, there is a four-way valve 2-metal switch, an on-off valve 15
, 16 and 17 are closed, and the refrigerant is supplied to compressor 1 and four-way valve 2.
．． Heat source side heat exchanger9. Check valve8. Gas-liquid separator6. Cooling throttle device4. User-side heat exchanger 3, four-way valve 2. The heat is circulated to the compressor 1, radiated by the heat source side heat exchanger 9, and then transferred to the user side heat exchanger 3.
Endotherm is carried out with.

Next, when controlling capacity according to load fluctuations, perform the following operations: 1. First, when reducing the capacity during heating, that is, when reducing the concentration of low boiling point components in the cycle, open the on-off valves 15 and 17.

16 is closed, and the vapor with a high concentration of low boiling point components separated by the gas-liquid separator 6 is guided into the refrigerant container 1Q through the conduit 11. At this time, since the on-off valve 17 is open, most of the refrigerant that has passed through the heating throttle device 7 flows from point a to point b.
A portion branches off at point a, passes through the bypass pipe 19, evaporates endothermally within the heat exchanger 21, cools the refrigerant container 10, and merges at the point. Therefore, the vapor with a high concentration of low boiling point components filling the refrigerant container 10 is condensed and stored. In this way, the concentration of low boiling point components circulating within the cycle can be reduced,
Open/close valve 15.17 when a predetermined concentration suitable for the load is reached.
'i just close it.

Next, when improving the capacity during heating, that is, when increasing the concentration of low-boiling components in the cycle, open the on-off valves 15 and 16 and close the valve 17 to remove a portion of the high-temperature refrigerant passing through the heat exchanger 3 on the user side. It branches at point 0, leads to heat exchanger 2o via bypass pipe 18, and joins at point d. By performing this operation, the refrigerant container 10 is heated, and the liquid with a high concentration of low-boiling components contained in the refrigerant container 10 is evaporated and introduced through the conduit 11 into the gas-liquid separator 6, that is, into the cycle. can. Thereafter, when the concentration in the cycle reaches a predetermined concentration suitable for the load, the on-off valves 15 and 16 are closed.

Also, during cooling, if the concentration of low boiling point components in the cycle is to be reduced and the capacity is to be reduced, the on-off valves 17 are closed and the valves 15 and 16 are closed.
is operated in the same manner as during heating, and conversely, when increasing the concentration of low boiling point components in the cycle to enhance the capacity, the on-off valve 16 may be closed and 15 and 17 may be operated in the same manner as during heating.

Note that in this example, a gas-liquid separator is used to separate vapor with a high concentration of low boiling point components from liquid with a low concentration. A size depending on the format. Furthermore, in this embodiment, the gas-liquid separator was installed between the outlet of the heat exchanger, which is on the high-pressure side during both heating and cooling, and the throttling device through which the refrigerant passes. The pressure is not limited to this, and it may be in the middle of the high-pressure side heat exchanger or at an intermediate pressure in the cycle. That is, it does not matter where the refrigerant inlet/outlet portion of the refrigerant container is located in the cycle.

Furthermore, in this embodiment, a heat exchanger 20 is provided in parallel with the user side heat exchanger piping c (-c), and a heat exchanger 21 is provided in parallel with the heat source side heat exchanger piping a-b. The invention is not limited to this circuit, but the present invention includes a circuit in which the refrigerant container can exchange heat with both the heat exchanger piping on the user side and the heat exchanger piping on the heat source side, and in which a non-azeotropic mixed refrigerant is used. It is within the range.

Effects of the Invention According to the present invention, it is possible to perform appropriate capacity control in response to load fluctuations at low cost without using expensive equipment such as an inverter circuit, and the effect is particularly great when applied to air conditioning type air conditioners. It's a dog.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional heat pump device that performs capacity control using a non-azeotropic mixed refrigerant, and FIG. 2 is a schematic configuration diagram showing an embodiment of the heat pump device according to the present invention. 1...Compressor, 3...Using side heat exchanger, 9...
・-Heat source side heat exchanger, 10... Refrigerant container, 20,
21...Heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A heat pump cycle is formed by connecting a compressor, a user-side heat exchanger, a throttling device, and a heat source-side heat exchanger in an annular manner, and the heat exchanger is connected to both the piping of the user-side heat exchanger and the piping of the heat source-side heat exchanger. A heat pump device having a refrigerant container provided so as to be exchangeable, the refrigerant container communicating with a gas-liquid separator provided in the heat pump cycle so as to be freely openable and closable, and using a non-azeotropic mixed refrigerant as a refrigerant. .