JPH06117720A - Heating and cooling machine - Google Patents

Abstract

PURPOSE:To provide a balanced state of required amount of refrigerant between a cooling operation time and a heating operation time and perform a positive recovery of lubricant into a compressor during the cooling operation in a heating and cooling machine utilizing a refrigerant circulation pump and a refrigerant heater. CONSTITUTION:A discharging pipe from a compressor 1 is provided with a cooling circuit in which refrigerant is passed from a second check valve 8, a four-way valve 2, an outdoor heat exchanger 3, a first throttle 4, a first opening or closing valve 15, a gas-liquid separator 10, a second opening or closing valve 17, a liquid receiver 11, a second throttle 5, an indoor heat exchanger 7 and a four-way valve 2 and returns to the compressor 1. In addition, the refrigerant is heated by the compressor 1, the four-way valve 2, the indoor heat exchanger 7, the first check valve 6, the liquid receiver 11, the refrigerant circulation pump 12 and the refrigerant heater 9, passes through a pipe 13 and reaches the gas-liquid separator 10 and liquid not yet evaporated passes through a pipe 14 and again flows through the heater 9. The evaporating gas passes through a third check valve 16, reaches again to the indoor heat exchanger 7 through the four-way valve 2, its heat is radiated into a room so as to accomplish the a object of heating operation, the liquid is condensed again, reaches the refrigerant circulation pump 12 to accomplish a closed loop and at this time, the compressor 1 is kept stopped. The gas-liquid separator 10 is placed above in such a manner that the distribution of the refrigerant can be adjusted by this gas-liquid separator 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / cooling machine that uses a compressor during cooling and uses a refrigerant circulation pump and a refrigerant heater during heating.

[0002]

2. Description of the Related Art A conventional heating / cooling machine of this type is shown in FIG. 2 as disclosed in Japanese Patent Laid-Open No. 57-101263.
The configuration is as shown in.

A compressor 1, a four-way valve 3, an outdoor heat exchanger 4, a first opening / closing valve 6, a throttle mechanism (capillary tube) 7, and an indoor heat exchanger 8 are sequentially connected by a refrigerant pipe, and the four-way valve 3 and the room are connected. A second opening / closing valve 10 and a check valve 11 are arranged in parallel between the heat exchangers 8 and branched from a connecting pipe between the throttling mechanism 7 and the indoor heat exchanger 8 to form a third opening / closing valve 13 and a refrigerant circulation pump 14. Refrigerant heater 1
5 are sequentially arranged and connected to a connecting pipe between the indoor heat exchanger 8 and the second on-off valve 10.

With the above construction, in the cooling operation, the first opening / closing valve 6 and the second opening / closing valve 10 are opened, the third opening / closing valve 13 is closed, the compressor 1 is operated, and the outdoor heat exchanger 4 is condensed. And the indoor heat exchanger 8 is used as an evaporator to cool the room, and the heating operation is performed by closing the first on-off valve 6 and operating the compressor 1 to exchange the refrigerant in the outdoor heat exchanger 4 with the indoor heat. After moving to the container 8, the compressor 1 is stopped, the second opening / closing valve 10 is closed, and the third opening / closing valve 13
By operating the refrigerant circulation pump 14, the refrigerant heater 15 serves as an evaporator and the indoor heat exchanger 8 serves as a condenser to heat the room.

[0005]

However, in the above-mentioned conventional configuration, the refrigerant circulation pump 14 and the refrigerant heater 15 are connected to the suction side of the compressor 1 in the gaseous state during the cooling operation, and act as a condenser. Most of the refrigerant is distributed to the outdoor heat exchanger 4, the indoor heat exchanger 8 acting as an evaporator, and the connection pipe from the throttle mechanism 7 that is decompressed by the throttle mechanism 7 and is in the gas-liquid two-phase state to the indoor heat exchanger. In the heating operation, the indoor heat exchanger 8 acting as a condenser, the refrigerant heater 15 acting as an evaporator, and the connection pipe from the indoor heat exchanger 8 in which high-pressure liquid refrigerant exists to the refrigerant circulation pump 14 are connected. Inside the refrigerant circulation pump and from the refrigerant circulation pump 14 to the refrigerant heater 15
Most of the refrigerant is distributed to the connection pipes up to, and the refrigerant distribution state is different between cooling and heating.Therefore, it is necessary to set the refrigerant charge amount that provides the optimum operating state during cooling and heating. It was extremely difficult.

Further, the refrigerant circulation pump 14 and the refrigerant heater 1
No. 5 has a problem that the lubricating oil of the compressor 1 that has flowed out into the refrigerant circuit accumulates because the refrigerant does not flow during the cooling operation, and the lubricating oil of the compressor 1 becomes insufficient, causing seizure.

The present invention has been made to solve the above problems and has an object to balance the amount of refrigerant required during cooling and heating and to reliably collect the lubricating oil discharged from the compressor during cooling operation in the compressor. It is a thing.

[0008]

In order to achieve the above object, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger, a first throttle mechanism, a second throttle mechanism connected in parallel with a first check valve, and an indoor chamber. A heat exchanger is sequentially connected by a refrigerant pipe, a second check valve is arranged between the discharge pipe of the compressor and the four-way valve, and a refrigerant is provided between the first throttle mechanism and the second throttle mechanism. Heater, gas-liquid separator,
A refrigerant circulation pump having a suction port opened inside the liquid receiver is provided in the liquid receiver, and the gas-liquid separator is provided above the refrigerant heater to heat the refrigerant by a forward pipe and a return pipe. Connected in a loop form to a container, an upper part of the gas-liquid separator is connected to the first throttle mechanism via a first opening / closing valve, and a lower part of the refrigerant heater is a gas-liquid separator of the first opening / closing valve. Side, the gas outlet pipe of the gas-liquid separator is connected between the second check valve and the four-way valve via a third check valve, and the discharge pipe of the refrigerant circulation pump is connected to the gas-liquid. As a configuration in which the outlet pipe of the separator is connected, the discharge pipe of the refrigerant circulation pump and the liquid receiver are connected via a second opening / closing valve, and the lower portion of the liquid receiver is connected to the second throttle mechanism. is there.

[0009]

According to the present invention, with the above structure, the gas-liquid separator is provided above the refrigerant heater so that the refrigerant distribution is adjusted by the gas-liquid separator during the heating operation, and the refrigerant heater and the gas-liquid separator are also adjusted. And the refrigerant circulation pump are arranged between the first throttle mechanism and the second throttle mechanism, so that the refrigerant heater, the gas-liquid separator, and the refrigerant circulation pump are filled with the gas-liquid two-phase state during the cooling operation. Even if a volume component is used, a high cooling capacity can be obtained for a wide range of refrigerant charge amounts. Therefore, it is possible to widely balance the amount of refrigerant required during cooling and during heating.

Further, since the refrigerant heater, the gas-liquid separator and the refrigerant circulation pump are arranged in the main flow path of the refrigerant during the cooling operation, the lubricating oil discharged from the compressor does not accumulate during the cooling operation. It can be reliably collected in the compressor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a compressor, 2 is a four-way valve,
3 is an outdoor heat exchanger, 4 is a first throttle mechanism, 5 is a second throttle mechanism connected in parallel with the first check valve 6, and 7 is an indoor heat exchanger.
These are sequentially connected by a refrigerant pipe, a second check valve 8 is arranged between the discharge pipe of the compressor 1 and the four-way valve 2, and the first throttle mechanism 4 and the second throttle mechanism 5 are connected. A refrigerant heater 9, a gas-liquid separator 10, and a refrigerant circulation pump 12 having a suction port opened in the liquid receiver 11 are provided in the liquid receiver 11, and the gas-liquid separator 10 is the refrigerant. The refrigerant heater 9 is connected to the refrigerant heater 9 in a loop by a forward pipe 13 and a return pipe 14 provided above the heater 9, and the upper portion of the gas-liquid separator 10 is connected to the first opening / closing valve 15 through the first opening / closing valve 15. It is connected to the throttle mechanism 4, the lower part of the refrigerant heater 9 is connected to the gas-liquid separator 10 side of the first opening / closing valve 15, and the gas outlet pipe of the gas-liquid separator 10 is connected to the third check valve 16. Is connected between the second check valve 8 and the four-way valve 2, and the discharge pipe of the refrigerant circulation pump 12 is connected to the gas-liquid separator 1 Of connecting to 往管, the refrigerant circulation pump 12 and the discharge pipe and the liquid receiver 11 of the second shut-off valve 1
7, the lower part of the liquid receiver 11 is connected to the second throttle mechanism 5.

In the above structure, the four-way valve 2 is used for the cooling operation.
Is switched so that the gas discharged from the compressor 1 flows to the outdoor heat exchanger 3, and the compressor 1 is operated with the first opening / closing valve 15 and the second opening / closing valve 17 being opened. At this time, the high-pressure refrigerant gas discharged from the compressor 1 passes through the second check valve 8 and the four-way valve 2, is condensed in the outdoor heat exchanger 3 acting as a condenser, and the liquefied refrigerant is the first throttle mechanism 4 Is depressurized by the first on-off valve 15
Through the flow path of the gas-liquid separator 10 and the lower portion of the refrigerant heater 9, and the refrigerant circulation pump 12 is built in from the return pipe 14 of the gas-liquid separator 10 through the second opening / closing valve 15. The second throttle mechanism 5 flows from the lower part of the liquid receiver 11 into the liquid receiver 11.
After being evaporated in the indoor heat exchanger 7 which is decompressed by and acts as an evaporator, the indoor heat is absorbed to cool the room, and then the room air is introduced again from the four-way valve 2 to the compressor 1. Therefore, even during the cooling operation, the refrigerant heater 9, the gas-liquid separator 10 and the refrigerant circulation pump 12
Since the refrigerant flows as a main flow path in a gas-liquid two-phase state, the lubricating oil discharged from the compressor 1 is reliably collected in the compressor 1 without accumulating in the refrigerant heater 9, the gas-liquid separator 10 and the refrigerant circulation pump 12. You will be able to.

Further, since the inside of the liquid receiver 11 containing the refrigerant heater 9, the gas-liquid separator 10 and the refrigerant circulation pump 12 is filled with the gas-liquid two-phase state, even if a large volume component is used, a wide refrigerant filling amount can be obtained. A high cooling capacity can be obtained.

Next, in the heating operation, the four-way valve 2 is first switched so that the discharge gas of the compressor 1 flows to the indoor heat exchanger 7, and the first opening / closing valve 15 and the second opening / closing valve 17 are closed. The compressor 1 is operated for a predetermined time to pump up the refrigerant in the outdoor heat exchanger 3 to the indoor heat exchanger 7, and then the refrigerant circulation pump 1
2 is operated to heat the refrigerant in the refrigerant heater 9 with a heating source (not shown) such as a burner. The refrigerant evaporated in the refrigerant heater 9 enters the gas-liquid separator 10 through the outward pipe 13, and the liquid mixed in the refrigerant gas returns to the refrigerant heater 9 through the return pipe 14, but the refrigerant gas becomes the gas-liquid separator 10. Check valve 16 of the gas outlet pipe of
After passing through the four-way valve 2 to the indoor heat exchanger 7 and condensing and radiating heat in the indoor heat exchanger 7 for heating, the liquid refrigerant passes through the first check valve 6 and flows through the refrigerant circulation pump 12. Enter the built-in liquid receiver 11. Therefore, by providing the gas-liquid separator 10 above the refrigerant heater 9, the gas-liquid separator 1 can be used during the heating operation.
By adjusting the refrigerant distribution at 0, stable operation is possible for a wide range of refrigerant charge amounts.

[0016]

As described above, according to the heating / cooling machine of the present invention, the following effects can be obtained.

(1) Since the gas-liquid separator is provided above the refrigerant heater, the refrigerant distribution is adjusted by the gas-liquid separator during the heating operation, and the refrigerant heater, the gas-liquid separator and the refrigerant circulation pump are also provided. By disposing between the first throttling mechanism and the second throttling mechanism, the refrigerant heater, the gas-liquid separator, and the refrigerant circulation pump are filled with a gas-liquid two-phase state during the cooling operation, so that a large volume component is used. Even when used, a high cooling capacity can be obtained for a wide range of refrigerant charge amounts. Therefore, it is possible to widely balance the amount of refrigerant required during cooling and during heating.

(2) The gas-liquid separator is provided above the refrigerant heater and is connected to the refrigerant heater in a loop by a forward pipe and a return pipe. The upper part of the gas-liquid separator has a first opening / closing valve. Connected to the first throttling mechanism, the lower part of the refrigerant heater is connected to the gas-liquid separator side of the first on-off valve, the discharge pipe of the refrigerant circulation pump is connected to the forward pipe of the gas-liquid separator, and the refrigerant circulation By connecting the discharge pipe of the pump and the liquid receiver via the second opening / closing valve and connecting the lower part of the liquid receiver to the second throttle mechanism, the refrigerant heater and the gas-liquid separator during the cooling operation. Since the refrigerant circulation pump is disposed in the main flow path of the refrigerant flow, the lubricating oil discharged from the compressor during the cooling operation can be reliably collected in the compressor without pooling.

[Brief description of drawings]

FIG. 1 is a system block diagram of a heating / cooling machine according to an embodiment of the present invention.

FIG. 2 is a system block diagram illustrating the configuration of a conventional heating and cooling machine.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 First throttling mechanism 5 Second throttling mechanism 6 First check valve 7 Indoor heat exchanger 8 Second check valve 9 Refrigerant heater 10 Gas-liquid separator 11 Liquid receiving Device 12 Refrigerant circulation pump 13 Outgoing pipe 14 Intake pipe 15 First opening / closing valve 16 Third check valve 17 Second opening / closing valve

Claims (1)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger, a first throttle mechanism, a second throttle mechanism connected in parallel with a first check valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe, and the compression is performed. A second check valve is arranged between the discharge pipe of the machine and the four-way valve, and is built in the refrigerant heater, the gas-liquid separator, and the liquid receiver between the first throttle mechanism and the second throttle mechanism. A refrigerant circulation pump having a suction port opened in the liquid receiver is provided, and the gas-liquid separator is provided above the refrigerant heater and is piped in a loop with the refrigerant heater by a forward pipe and a return pipe. Connected, the upper portion of the gas-liquid separator is connected to the first throttle mechanism via a first opening / closing valve, the lower portion of the refrigerant heater is connected to the gas-liquid separator side of the first opening / closing valve, The gas outlet pipe of the gas-liquid separator is connected between the second check valve and the four-way valve via a third check valve, and the discharge of the refrigerant circulation pump. Is connected to the forward pipe of the gas-liquid separator, the discharge pipe of the refrigerant circulation pump and the liquid receiver are connected via a second opening / closing valve, and the lower part of the liquid receiver is connected to the second throttle mechanism. Connected heating and cooling machine.