JPS6210568A - Heat pump - 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 [Technical Field] The present invention relates to a heat pump that has both heating and cooling functions and dehumidifying functions.

[Foreground technology]

As shown in FIG. 2, a so-called multi-heat pump having an air-conditioning function and a dehumidifying function includes a compressor 1, and heat exchangers A and B which are connected in order along the flow direction of the refrigerant from the compressor Ia1. A heat exchange device 4 for dehumidification and heat absorption and radiation, which has a first throttle device 2 and an on-off valve 3 connected in parallel between these heat exchangers Δ and B.
The compressor 1 is equipped with a heat exchanger C for heating and cooling connected to the refrigerant pipe between the compressor 1 and the heat exchanger 4 by a circuit switching valve 5.6, and a second throttle device 7.

When performing dehumidification operation, close the on-off valve 3 and compress the refrigerant.
A circulation path is taken in which the flow goes in this order: l - heat exchanger A - first expansion device 2 - heat exchanger B - compressor l. That is,
The refrigerant is discharged from the compressor 1 as a high-pressure gas, condensed in the heat exchanger A (condenser) in the heat exchanger 4, reduced in pressure by the first throttle device 2 such as an expansion valve, and then transferred to the heat exchanger B (evaporator). It is evaporated in the tank) and returned to the compressor 1 via the circuit switching valve 8.9.

At this time, the humid air is cooled to below the dew point temperature in the heat exchanger B, and dew condenses on the surface of the heat exchanger 8 to remove moisture.

Thereafter, the air from which moisture has been removed is heated by passing through heat exchanger A, and is discharged into the room.

On the other hand, when you want to cool with heat exchanger C, heat exchanger 4
The on-off valve 3 is opened, and the circuit switching valves 5 and 6 are switched so that the refrigerant passes through the second expansion device 7 and the heat exchanger C in this order. As a result, the refrigerant is condensed in heat exchanger A and heat exchanger B in heat exchanger 4, passes through circuit switching valve 5, is depressurized in second throttle device 7, evaporates in heat exchanger C, and is evaporated in heat exchanger C. 6 and returns to the compressor 1. At this time, the refrigerant path is compressor 1 - heat exchanger A - on-off valve 3 - heat exchanger B - circuit switching valve 5 → second throttling device 7 - heat exchanger C - circuit switching valve 6 - compressor] The order is as follows. That is, heat exchangers A and B in the heat exchange device 4 both function as a condenser, and heat exchanger C functions as an evaporator.

In these two types of refrigerant circuits, the circuit switching valve 5
．． Since the length of the circuit differs due to the switching in step 6, the optimum amount of refrigerant will also necessarily differ, and the amount of refrigerant required will be greater in the operating state during cooling than during dehumidification due to the longer piping length. . Therefore, when dehumidifying operation is performed with the required amount of refrigerant during cooling, the inside of heat exchanger A is filled with refrigerant liquid, so
This greatly reduced the condensing heat transfer area, causing problems such as a decrease in efficiency.

[Purpose of the invention]

An object of the present invention is to provide a heat pump that can always perform dehumidifying operation and cooling/heating operation with the optimum amount of refrigerant without causing efficiency loss or high pressure trouble due to excess refrigerant, or insufficient capacity due to insufficient refrigerant.

[Disclosure of the invention]

The heat pump of the present invention includes: a compressor, and a heat exchanger A and a heat exchanger B connected in sequence along the flow direction of refrigerant from the compressor, and between the heat exchangers A and B. a heat exchange device including a first throttle device and a first on-off valve connected in parallel to the compressor, and a heat exchanger connected to a refrigerant pipe between the compressor and the heat exchange device by a circuit switching valve. C and a second expansion device, a refrigerant receiver for storing an excess amount of refrigerant is provided between the heat exchanger A and the first expansion device in the heat exchanger, and the refrigerant receiver A second on-off valve is provided between the heat exchanger A and the refrigerant receiver, and the refrigerant pipe is branched from the refrigerant pipe between the first expansion device and the refrigerant receiver and is connected to the compressor via the third on-off valve. It is characterized by providing a bypass path for supplying refrigerant connected to the suction port side of the refrigerant.

Therefore, according to the present invention, by closing the first on-off valve and the third on-off valve and keeping the second on-off valve open during dehumidification operation, surplus refrigerant is stored in the refrigerant receiver.
The problem of overfilling of the refrigerant liquid in the heat exchanger A is eliminated, and operation can be performed without a decrease in efficiency or high pressure troubles caused by an excess of refrigerant.

On the other hand, when switching from the dehumidifying operation to the cooling operation using the heat exchanger C, the second on-off valve is closed and the first on-off valve and the second on-off valve are opened to perform the cooling operation. The refrigerant liquid that has accumulated inside the refrigerant is gradually evaporated by the suction of the compressor and used for cooling operation, so that there is no possibility of a lack of capacity due to a lack of refrigerant.

Example to I An embodiment of the invention will be explained based on the first bow ζ.

Note that the same constituent members as shown in FIG. 2 are designated by the same reference numerals and their explanations will be omitted. That is, as shown in FIG. 1, the toto bomb of the present invention includes a compressor 1 and a heat exchanger A connected in order along the flow direction (indicated by an arrow) of refrigerant from the compressor 1. a heat exchanger 9 having a heat exchanger B and interposing a first throttle device 2 and a first on-off valve 8 connected in parallel between the heat exchangers A and B; A heat pump equipped with a heat exchanger C and a second expansion device 7 connected to a refrigerant pipe between a1 and a heat exchange device W9 by circuit switching valves 5 and 6, the heat exchange in the heat exchange device 9 A refrigerant receiver 10 for storing an excess amount of refrigerant is provided between the container A and the first expansion device 2, and a second on-off valve 11 is provided between the refrigerant receiver 10 and the heat exchanger A. At the same time, a third on-off valve 12 is branched from the refrigerant pipe between the first expansion device 2 and the refrigerant receiver 10.
A bypass passage 13 for supplying refrigerant is provided, which is connected to the suction port side of the compressor 1 via the compressor 1.

A check valve 14 is provided near the refrigerant inlet of the first throttle device 2.
is provided to prevent the refrigerant from flowing back in its flow direction.

Next, the operation of this embodiment will be explained. During dehumidification operation, the first
By closing the on-off valve 8 and the third on-off valve 12 and leaving the second on-off valve 11 open, the excess refrigerant is transferred to the refrigerant receiver 10.
Since the refrigerant liquid is stored in the heat exchanger A, there is no problem that the refrigerant liquid is too full, and operation can be performed without a decrease in efficiency or high pressure problems caused by an excess of refrigerant. On the other hand, when switching from dehumidifying operation to cooling operation using heat exchanger C, the second on-off valve 11 is closed and the first on-off valve 8 and the third on-off valve 1
By opening 2 and performing cooling operation, the refrigerant receiver l
The refrigerant liquid accumulated in O is gradually evaporated by the suction of the compressor 1 and is used for cooling operation, so that there is no shortage of capacity due to lack of refrigerant. Since the check valve 14 is provided on the refrigerant inflow side, it is possible to prevent the refrigerant liquid from flowing backward into the refrigerant receiver 10 .

〔Effect of the invention〕

According to this invention, during dehumidification operation, by closing the first on-off valve and the third on-off valve and keeping the second on-off valve open, surplus refrigerant is stored in the refrigerant receiver, so that the heat exchanger A
There is no problem that the refrigerant liquid is too full in the refrigerant, and operation is possible without efficiency reduction or high pressure trouble caused by excess refrigerant.On the other hand, when switching from dehumidifying operation to cooling operation using heat exchanger C, the second By closing the on-off valve and opening the first on-off valve and the second on-off valve to perform a cooling operation, the refrigerant liquid accumulated in the refrigerant receiver is gradually evaporated by the suction of the compressor and used for the cooling operation. This has the effect of preventing a lack of capacity due to a lack of refrigerant.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of the proposed heat pump. 1... Compressor, 2... First expansion device, 4, 9...
・Heat exchange device, 5.6...Circuit switching valve, 7...Second
throttling device, 8... first on-off valve, 10... refrigerant receiver, 11... second on-off valve, 12... third on-off valve, 13... bypass path, 14 ···non-return valve

Claims (1)

[Claims] A compressor, and a heat exchanger A and a heat exchanger B connected in sequence along the flow direction of refrigerant from the compressor, and between the heat exchangers A and B. a heat exchange device including a first throttle device and a first on-off valve connected in parallel to the compressor, and a heat exchanger connected to a refrigerant pipe between the compressor and the heat exchange device by a circuit switching valve. C and a second expansion device, a refrigerant receiver for storing an excess amount of refrigerant is provided between the heat exchanger A and the first expansion device in the heat exchanger, and the refrigerant receiver A second on-off valve is provided between the heat exchanger A and the refrigerant receiver, and the refrigerant pipe is branched from the refrigerant pipe between the first expansion device and the refrigerant receiver and is connected to the compressor via the third on-off valve. A heat pump characterized by having a refrigerant supply bypass path connected to the suction port side of the heat pump.