JPS5918349A - Heat pump system separation 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 refrigerant control device in a heat pump component air conditioner in which a plurality of indoor units are connected to one outdoor unit, and adjusts the amount of pressure reduction during cooling. Adjust the injection amount when heating.
We have created a low-cost heat pump air conditioner that can operate two heating and cooling units simultaneously, drawing out the maximum capacity of each, and adjusting the amount of pressure reduction without dividing the capillary cheep, which is the pressure reduction mechanism during heating. The purpose is to obtain.

Conventionally, for example, a heat pump component air conditioner that connects two indoor units to one outdoor unit,
The circuit is as shown in FIG. 1 is a compressor, 2
is a four-way valve, 3 is an outdoor heat exchanger, 4 is a source side three-way valve, 6,6
is a check valve that passes during cooling; 7 and 8 are heating capillary tubes installed in parallel with the check valves 6 and 6; 9 and 1Q are
is a capillary tube for cooling, 11.12 is a source side solenoid valve, 13.14 is a backflow valve for preventing backflow, 15.16 is a capillary tube for pressure equalization, and injection boat 17
It is connected to the circuit and serves as a pressure equalization circuit during heating, as well as a circuit for injection. 18 is the No. 1 indoor unit, 19 is the No. 2 indoor unit 7), 20.21 is the gas side solenoid valve, 22°23 is the check valve installed in parallel with this gas side solenoid valve 20.21, and 24 is the gas side solenoid valve. side three-way valve, 26 is a check valve for preventing backflow to the injection boat 17 side,
2θ is an accumulator, and 27 is a high pressure regulating valve.

Conventionally, the refrigerant circuit is configured in this manner, and even if one indoor unit is operated or two indoor units are operated simultaneously, it is impossible to achieve the maximum capacity of each indoor unit during cooling. That is,
Unit 1 indoor unit 18 or.

In order to maximize the capacity when one Unit 2 indoor unit 19 is operated and when two Units 1 and 2 indoor unit 19 are operated simultaneously, it is necessary to change the throttle amount. )
The evaporation pressure after passing through the cooling capillary tube 9 and the cooling capillary tube 9 and 1 when two units are operated simultaneously.
Since the evaporation pressure after passing through 0 is different, sufficient cooling capacity cannot be obtained. In addition, during heating, the amount of injection flowing into the injection boat 17 is different when one of the No. 1 indoor unit 18 or No. 2 indoor unit 19 is operated, and when two units (No. 1 and 2 indoor unit 18.19) are operated simultaneously. When two indoor units are operated at the same time, the condensing capacity of the two indoor units increases, which lowers the high pressure and therefore reduces the injection amount. However, if the cavity was adjusted, the amount of injection would not be appropriate and a sufficient heating effect could not be obtained. (By setting the injection amount appropriately, the heating capacity increases because the amount of refrigerant compressed by the compressor increases, and the amount of refrigerant circulated on the high-pressure side increases.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below based on FIG. 2.

31 is one outdoor unit, 32 is this outdoor unit 3
1 is connected to the No. 1 indoor unit, 33 is the No. 2 indoor unit, 34 is a compressor, 35 is a four-way valve, 36 is an outdoor heat exchanger, 37 is a check valve provided in the main cooling circuit 38, 39 is a primary capillary tube for cooling provided in the same circuit, 4o is a source side three-way valve, and 41.42 is provided in a number according to the number of indoor units, and is provided branching from the source side three-way valve 40 side. Secondary capillary tube for cooling, 43°44
is the source side solenoid valve, 45.46 is according to the number of indoor units,
Check valves are provided in independent heating main circuits 47 and 48, 49 and 50 are heating capillary tubes provided in the same circuits, and 51 is an injection capillary tube, one end of which is connected to the cooling primary capillary tube. tube 3
9 and the source three-way valve 40, and the other end is connected to the injection boat 52. 53 is a check valve that allows part of the refrigerant to flow from the injection boat 62 to the four-way valve 36 side during cooling, and 54 and 56 are indoor heat exchangers provided in the No. 1 indoor unit 32 and the No. 2 indoor unit 33. , 66.6 is a gas-side solenoid valve, and 58.59 is a check valve provided in parallel with the gas-side solenoid valves 56 and 57 through which refrigerant passes during cooling. 60 is a gas side three-way valve,
61 is an accumulator, and 62 is a high-pressure pressure regulating valve, which performs an opening operation when a high pressure equal to or higher than a predetermined pressure is reached during cooling and heating.

In the above configuration, for example, during cooling, the compressor 3
4. Four-way valve 35. Outdoor heat exchanger 36° connection part 65. Check valve 37. Primary capillary tube for cooling39. Connection part 66, source side three-way valve 40. Connection part 67. When two units are operated at the same time, the secondary capillary tubes for cooling 41, 42. Source side solenoid valve 43. 44° indoor heat exchanger 54. 5B, check valve 6B, E>9° gas side three-way valve 60. Four-way valve 35. Accumulator 61. The refrigerant circuit is configured in the order of the compressor 34, and at this time, when two indoor units are operated simultaneously,
Since the pressure is reduced by the primary cooling capillary tube 39 and the secondary cooling capillary tube 41.42, the cooling secondary capillary tube 41.4 is reduced compared to when one unit is operated.
2, the refrigerant evaporation temperature becomes high, and 2
When the units are operated simultaneously, the evaporation temperature becomes appropriate and the refrigeration effect is enhanced. In addition, when one unit is operated, for example, the refrigerant evaporation temperature becomes low at the time when it passes through the primary cooling capillary tube 39 and the cooling secondary capillary tube 41 side, and the evaporation temperature is lower than the appropriate evaporation temperature when one unit is operated. This increases the freezing effect. That is, when two units are operated at the same time, the cooling secondary capillary tubes 41 and 42 are in parallel flow paths, resulting in less pressure reduction, while when one unit is in operation, only the cooling secondary capillary tubes 41 are in the flow path, resulting in less pressure reduction. becomes large, and the evaporation temperature becomes low, resulting in a flow rate change that matches one indoor unit (No. 1 indoor unit). Also, at this time, a small portion of the liquid refrigerant that has passed through the primary capillary tube 39 for cooling passes through the capillary tube 51 for injection, becomes together with the gas refrigerant that comes out from the injection port 62, and flows through the check valve 53. , four-way valve 35. It flows to the accumulator 61 and power is saved (capacity controlled).

Next, during heating, when two units are operated simultaneously, the compressor 34
．． Four-way valve 35. Gas side three-way valve 60. gas side solenoid valve 66,
67. Indoor heat exchanger 54. 55° check valve 46.
46. Heating capillary tube 49.50. Connection point 6
5. Outdoor heat exchanger 36. Four-way valve 35. Accumulator 61. A refrigerant circuit is constructed in the order of the compressor 34, and at this time,
In the indoor heat exchanger 64.65, the condensed liquid refrigerant is
In the main heating circuits 47 and 48, which correspond to the number of rooms, it flows through independent circuits and is depressurized, while a part of the liquid refrigerant condensed in the indoor heat exchangers 54 and 55 is used for cooling. Secondary capillary tube 4.1, 42° connection point 67, source side three-way valve 40. The refrigerant flows to the connection point 66 and the injection capillary tube 51, where it is further depressurized, flows to the injection port 52, is injected into the compressor 34, and the refrigerant circulates to the indoor heat exchanger 64.55. This increases heating capacity. or,
When one heating unit is in operation, for example, when the No. 1 indoor unit 32 is in operation, the liquid refrigerant condensed in the indoor heat exchanger 64 flows through the check valve 46. Heating capillary tube 49. A heating main circuit 47 is provided with a connection point 65 and a heating capillary tube 49 that matches its indoor heat exchanger 54, while a cooling secondary capillary tube 41. Source side three-way valve 4
0. Since a part of the liquid refrigerant is allowed to flow through the connection part 66, the injection capillary tube 61, and the injection port 52, sufficient capacity can be obtained even when one unit is operated.

In this way, the present invention provides an outdoor unit with a primary capillary tube for cooling in the cooling main circuit during cooling, and a secondary capillary tube for cooling depending on the number of indoor units; The liquid refrigerant condensed in the inner heat exchanger flows into the outdoor unit and passes through heating capillary tubes in the heating main circuit according to the number of indoor units, while a portion of the liquid refrigerant is passed through the cooling secondary capillary tube. Since the circuit is configured to return from between the tube and the primary capillary tube for cooling to the injection port via the capillary tube for injection, during cooling, the maximum In order to bring out the capacity, the amount of pressure reduction is changed. In other words, when two units are operating simultaneously, the secondary capillary tubes for cooling become parallel when considering the entire cycle, and the division ratio of the primary capillary tube for cooling and the secondary capillary tube for cooling/heating is changed. This makes it possible to bring out the maximum performance both when one unit is operated and when two units are operated simultaneously.

Also, during heating, when two units are operated simultaneously, the condensing capacity increases, so the high pressure decreases, and the capillary tube uses the characteristic that the amount of pressure reduction (resistance) does not change much. The capacity can be adjusted at low cost without dividing the capillary tube or increasing the number of brazed parts, and) In terms of injection volume, when two units are operated simultaneously, the pressure at the connection part 66 will decrease significantly due to the drop in high pressure. Compared to the conventional circuit, the pressure at the connection part is lower because the secondary capillary tubes for cooling in the present invention are in parallel.
It is not affected by the drop in high pressure pressure, and it is possible to obtain an appropriate injection amount close to the pressure at the connection part when operating one unit, and the overall capacity when operating two units can be further improved. Moreover, when two units are operated at the same time, the cooling and heating capacities are greater than those of conventional units, and each unit can be manufactured to its maximum capacity at a low cost.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a heat pump separable air conditioner to be explained in the related art, and FIG. 2 is a refrigerant circuit diagram of a heat pump separable air conditioner according to the present invention. 31...Outdoor unit), 32.33...
・Indoor unit, 36...Outdoor heat exchanger, 3
7... Check valve, 38... Cooling main circuit,
39... Primary capillary tube for cooling, 40
......Source side three-way valve, 41゜42...Secondary capillary tube for cooling, 43゜44...Source side solenoid valve, 45.46... Check valve, 47.48
... Heating main circuit, 49.50... River/heating capillary tube, 61... Injection capillary tube, 52... River/injection port), 54. 55...Indoor heat exchanger.

Claims (1)

[Claims] In a multi-type heat pump component air conditioner in which multiple indoor units are connected to one outdoor unit, an outdoor heat exchanger provided in the outdoor unit, a check valve for circulation during cooling, A cooling main circuit to which a primary cooling cavity cheap, a source three-way valve, a cooling secondary capillary tube installed in parallel according to the number of rooms, and a source solenoid valve are respectively connected, and the plurality of indoor units. The flow flows through the indoor heat exchanger installed at The heating circuit is connected between the outdoor heat exchanger and the cooling flow check valve, and the heating circuit is connected to the cooling primary cabinet of the cooling main circuit. This is a heat pump separation type air conditioner that connects the SiriTube and source side three-way valve to the injection port on the compressor side via an injection capillary tube.