JPS58148367A - 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 The present invention relates to a heating and cooling system equipped with a device for controlling the difference in the amount of refrigerant circulated between cooling and heating by a heat pump device.

Normally, in a refrigeration cycle, the appropriate refrigerant flow rate varies depending on the evaporation temperature, and as the evaporation temperature increases, a larger refrigerant flow rate is required.However, in a refrigeration cycle that uses a capillary tube as a pressure reducing device, the refrigerant flow rate can be adjusted. When the width is small and the evaporation temperature is high, the refrigerant flow rate is insufficient,
If the degree of superheating of the refrigerant at the rA generator outlet becomes too large and the compressor temperature rises, or if the evaporation temperature is low, the refrigerant flow rate may become excessive (resulting in liquid buildup in the compressor). . Therefore, in order to solve these problems, a refrigeration cycle as shown in FIG. 1 can be considered. That is, in FIG. 1, (l) is a compressor, (21 is a condenser,
(3) is a pressure reducing device, as shown in Figure 2, the outer tube (31)
An inner tube (34) having a refrigerant passage (32) at its axial center and a small diameter spiral groove (33) at its outer periphery is fitted inside. And a spiral groove (A3) and a refrigerant flow path (32)
Inlet pipes (35) (36) so that they are parallel to each other ≦:
It is connected to the outlet of the condenser (2) and the inlet of the evaporator (to be described later) via the outlet pipe (37), and is configured by providing a flow rate adjustment valve (39) such as an electric expansion valve in the single-portion pipe (36). This is what I did. (4) is an evaporator, and these equipment f
il~(3) are sequentially connected to form a refrigeration cycle. Therefore, the compressor il+ and the condenser (2) function in the same way as in a normal refrigeration cycle, but in the pressure reducing device (3), the liquid refrigerant supplied from the condenser (2) flows in a spiral shape @ (33). Then, the pressure is reduced and evaporation occurs in the evaporator (4) to provide a cooling effect. A part of the liquid refrigerant supplied to the condenser (2) is depressurized by the flow rate adjustment valve (39), evaporates in the refrigerant flow path (32), and cools the refrigerant flowing in the spiral groove (, 33). Therefore, the spiral groove (33
) increases. C that is.

This is because the gas content in the two-phase flow of refrigerant occurring in the spiral groove decreases as the amount of cooling increases.This is because the fluid resistance decreases.

Therefore, the amount of cooling can be changed by adjusting the opening of the flow rate regulating valve (39).1 For example, the temperature at the inlet and outlet of the evaporator (4) is detected, and the outlet temperature of the evaporator +41 is higher than the inlet temperature. The flow rate adjustment valve (39
), the refrigerant is completely gasified at the outlet of the evaporator (4) and slightly superheated, allowing the refrigerant to circulate within the refrigeration cycle at a constant (2) appropriate flow rate.By the way, the cooling cycle and heating cycle The capacity is different between the two types, and it is necessary to increase the amount of refrigerant circulation during the cooling cycle.The spiral groove (33) needs to be short during the cooling cycle and long during the heating cycle. When configuring a heat pump air-conditioning cycle using a pressure reducing device (3), it is sufficient to prepare a cooling and a heating pressure reducing device, connect them in parallel, and use them separately in the cooling cycle. It has to be manufactured individually, and the device is also large in size. Therefore, it is required to have a pressure reducing device that can be used for both cooling and heating, but as mentioned above, the flow rate of refrigerant flowing in the spiral groove (3A) In a pressure reducing device that controls the amount of refrigerant by the amount of cooling, the required amount is selected depending on the length of the spiral groove (33) during the cooling cycle. There are drawbacks that arise.

This invention has been made to eliminate the above-mentioned drawbacks, and one embodiment of the invention will be described below based on Figure 1s3 C″. In the same figure, (100) C compressor, (101)
is a four-way switching valve, (102) is a non-use side heat exchanger that exchanges heat with outside air, (103) is a use side heat exchanger that exchanges heat with water, (104) is a non-use side heat exchanger and a user side heat exchanger ( 1
02) A pressure reducing device installed between (103) and the first
It has the same structure as the pressure reducing device (3) shown in the figure, but
The flow rate adjustment valve (39) is connected to the outside temperature and the user side heat exchanger (10).
3) It is controlled based on the detection signal of the outlet water temperature.

(105) (106) are respectively connected to the non-use side and the use side heat exchangers (102) (103) to the pressure reducing device (104).
), the first and second check valves (107) and (108) allow flow only to the inlet f(35) of the pressure reducing device (1
04) third and fourth check valves that allow flow only from the outlet pipe (37) to the use side and non-use side heat exchangers (103) (102), (109) is the check valve (108) It is a capillary tube connected to the outlet pipe (40) of the heat exchanger (102) on the non-use side.

Further, in FIG. 1, solid line arrows indicate the heating cycle, and dotted line arrows indicate the flow direction of the refrigerant during the cooling cycle.

First, during the heating cycle, the user side heat exchanger (t
03) acts as a condenser and heats the water, and the refrigerant is condensed and liquefied. Then, the liquid refrigerant is transferred to the second check valve (106).
, a spiral groove (33), and a fourth check valve (1
08) and the capillary tube (109) to the non-use side heat exchanger (102)1], where it is evaporated and sent to the compressor (1).
Return to 100). On the other hand, a part of the liquid refrigerant from the user side heat exchanger (103) flows through the flow rate adjustment valve (39) similar to that in Fig. 1.
) to appropriately control the refrigerant flow rate by cooling the refrigerant flowing through the spiral groove (33). At this time, a voltage calculated based on the outside air temperature and water temperature detection signals is applied to the flow rate adjustment valve (39) to determine the valve opening degree. This is because the heating and cooling capacity is determined by the outside air temperature and water temperature. Also.

During the cooling cycle, the cycle is reverse to that of the heating cycle, so the liquid refrigerant from the unused heat exchanger (102) passes through the first check valve (105) and enters the pressure reducing device (10) as in the heating cycle.
4), passes through the third check valve (107), reaches the user-side heat exchanger (103), and cools the water.

As mentioned above, the pressure reducing device (104) is selected according to the cooling cycle, but during heating the capillary tube (104) is selected according to the cooling cycle.
The pressure is further reduced through the heat exchanger (109) on the user side (109), and the pressure is further reduced through the heat exchanger (109).
02), the flow rate of the refrigerant will not become excessive, and therefore, liquid leakage to the compressor can be prevented.

As a pressure reducing device, as shown in Fig. 4, a capillary tube (33) is coiled and inserted into the outer tube (31) as a substitute for the spiral groove, and a flow rate regulating valve (39) is installed around the capillary tube (A). ) A similar effect can be obtained by circulating refrigerant under reduced pressure.

As described above (= in this invention, a pressure reducing device configured to control the flow rate of refrigerant flowing through a pressure reducing section using a part of the liquid refrigerant and a capillary tube are installed in series, and only the pressure reducing device is used during the cooling cycle). By circulating the refrigerant and direct current flowing through the pressure reducing device and the capillary tube during the heating cycle, an appropriate flow rate of the refrigerant can be ensured for both cooling and heating.

In addition, since it is only necessary to add a capillary tube to the decompression device, its configuration is simplified (1), and it is possible to provide a heat pump type cooling/heating device 51 that can realize inexpensive and highly reliable heating and cooling operations.

[Brief explanation of the drawing]

is1 is a refrigeration cycle diagram, FIG. 2 is a configuration diagram of a pressure reducing device used in the refrigeration cycle of FIG. 1, FIG. 3 is a pump cycle diagram showing one embodiment of this invention, and FIG. It is a block diagram of the pressure reduction apparatus which shows another Example. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the figure, (100) is a compressor, and (101) is a four-way switching valve. (102) (103) is the non-use side and use side heat exchanger, (104) is the pressure reducing device, (105) to (108) are the first to fourth check valves, and (109) is the capillary tube. . Agent Makoto Kuzuno

Claims (1)

[Claims] A portion of the liquid refrigerant is used to reduce the amount of cooling of the refrigerant flowing through the decompression section! 1liEL, a capillary tube is inserted into the flow path connecting the outlet of the pressure reduction device that controls the flow rate of refrigerant flowing through the pressure reduction section and the non-use side heat exchanger. A heat pump cooling/warming device characterized in that a pressure reducing device and a capillary tube are operated during a heating cycle, and only the pressure reducing device is operated during a cooling cycle.