JPS6383559A - Outdoor unit for air conditioning - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an outdoor unit for air conditioning that performs heating and cooling, and in particular, an outdoor unit for air conditioning that can exhibit sufficient heating capacity even in cold weather. This relates to outdoor units.

(Prior Art) A heating device that uses a so-called heat pump is characterized by being able to perform heating more economically than other heating devices that do not use a heat pump. However, since a heating device using a heat pump is a device that heats a room indoors using heat absorbed from outside air, its heating capacity depends on the outside temperature.

For this reason, a heating device using a heat pump has a problem in that its heating capacity decreases as the outside temperature decreases, making it impossible to perform economical heating.

Various devices have been proposed to solve this problem.

For example, Japanese Utility Model Application Publication No. 60-116161 states that in cold weather when the outside temperature has dropped, the cooling water of the internal combustion engine is guided to the outdoor heat exchanger, and the exhaust heat of the internal combustion engine is used to prevent deterioration of the heating capacity. A device has been proposed.

(Problem that the invention sought to solve) However, in such a device, when the outdoor air conditioning unit performs cooling operation, the four-way valve is first operated, and then the water flow path switching valve is operated to switch off the cooling water. There was a problem in that the flow path had to be switched to prevent heat exchange between the refrigerant and the cooling water.

Therefore, in the present invention, it is a technical problem to configure an air conditioning outdoor unit in which heat exchange between the refrigerant and the cooling water is not performed only by operating the four-way valve when the outdoor air conditioning unit performs cooling operation. did.

[Structure of the invention]

(Means for solving the problem) The technical means taken to solve the problem are: a compressor that compresses refrigerant; an internal combustion engine that drives the compressor; a four-way valve that switches the flow direction of the refrigerant; a first heat exchanger that performs actual cooling by discharging the heat of the cooling water of the internal combustion engine to the outside air; and a third heat exchanger that performs heat exchange between the refrigerant and the outside air. a second heat exchanger that exchanges heat between the refrigerant and the cooling water; and a second heat exchanger that selectively sends the refrigerant to the third heat exchanger and the second heat exchanger depending on the direction in which the refrigerant flows. This is achieved by installing a refrigerant circuit switching valve.

(Function) According to the configuration of the present invention, when the air conditioning outdoor unit performs heating operation, the refrigerant circuit switching valve sends the refrigerant to the second heat exchanger. Therefore, the refrigerant is heated by exchanging heat with the cooling water.

Conversely, when the air conditioning outdoor unit performs cooling operation, the refrigerant circuit switching valve sends refrigerant to the third heat exchanger. Therefore, the refrigerant is cooled by exchanging heat with the outside air.

As mentioned above, the refrigerant circuit switching valve changes the flow path of the refrigerant depending on the direction in which the refrigerant flows, so when the outdoor unit for air conditioning is in cooling operation, heat exchange between the refrigerant and the cooling water is performed simply by operating the J morning valve. You can avoid it.

In a preferred embodiment of the present invention, the first heat exchanger, the second heat exchanger, and the third heat exchanger are integrally formed.

Furthermore, in order to prevent thermal interference between the first heat exchanger and the third heat exchanger, insulation is provided between the first heat exchanger and the third heat exchanger.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention. In this embodiment, two indoor air conditioning units 8 are connected to one outdoor air conditioning unit 4. As shown in FIG.

The air conditioning outdoor unit 4 uses an internal combustion engine 1 as its power source.
are using. The internal combustion engine 1 uses LNG (liquefied natural gas) as fuel. The internal combustion engine l drives two compressors 2. The internal combustion engine 1 and the two compressors 2 are connected by two independent belts 3 so that the two compressors 2 can each operate independently. A pulley 2a attached to the compressor 2 has a built-in electromagnetic clutch, and the compressor 2 is connected to the internal combustion engine 1 according to the state of the air conditioning indoor unit 8 corresponding to each compressor 2.

Further, an outdoor heat exchanger 12 is attached to the air conditioning outdoor unit 4. Two outdoor heat exchangers 12 are provided corresponding to the two compressors 2. Outdoor heat exchanger 1
2 consists of three parts, one is a third heat exchanger 13 for exchanging heat between the refrigerant and the outside air, and the other is for discharging the heat of the cooling water of the internal combustion engine 1 to the outside air. The remaining one is a second heat exchanger 15 that exchanges heat between the refrigerant and the cooling water of the internal combustion engine 1.

A slit 16 is provided at the boundary between the third heat exchanger 13 and the first heat exchanger 14, and the space between the third heat exchanger 13 and the first heat exchanger is insulated. The outdoor heat exchanger 12 has a structure in which a first heat exchanger 14 is provided below a third heat exchanger 13, and a second heat exchanger 15 is further integrally formed below the first heat exchanger 14.

In order to promote heat exchange between the outdoor heat exchanger 12 and the outside air,
A fan 20 is provided in the air conditioning outdoor unit 4. The fan 20 rotates and outside air flows into the air conditioning outdoor unit 4 via the outdoor heat exchanger 12. At this time, the refrigerant in the third heat exchanger 13 and the cooling water in the first heat exchanger 14 exchange heat with the outside air, respectively. However, the second
In the heat exchanger 15, in order to efficiently exchange heat between the refrigerant and the cooling water, it is desirable to prevent outside air from flowing through the second heat exchanger 15. Therefore, in this embodiment, a draft prevention wall 19 that covers the second heat exchanger 15 is fixed to the surface of the outdoor heat exchange unit 12 that comes into contact with the outside air.

A refrigerant circuit in which refrigerant circulates will be described below.

Since the two refrigerant circuits are identical, only one side will be described hereafter.

The internal combustion engine 1 and the compressor 2 are connected by a belt 3. The compressor 2 compresses the refrigerant and sends it to the four-way valve 5.

The four-way valve 5 is a valve for selecting between a cooling operation and a heating operation, and the illustrated state is a state in which the heating operation is selected.

The refrigerant sent from the compressor 2 to the four-way valve 5 is sent from the outdoor unit 4 to the indoor heat exchanger 6 of the indoor unit 8. In the indoor heat exchanger 6, the refrigerant compressed by the compressor 2 releases its condensation heat to heat the room in which the indoor heat exchanger 6 is installed.

Next, the refrigerant is passed from the indoor heat exchanger 6 through the check valve 7.
It is sent out to the outdoor unit 4 again. The refrigerant sent to the outdoor unit 4 is sent to the outdoor heat exchanger 12 via the expansion valve 11 and the check valve 10.

The refrigerant sent to the outdoor heat exchanger 12 via the expansion valve 11 and the check valve 10 first passes through the second heat exchanger 15 .

The refrigerant that has passed through the second heat exchanger 15 is then sent to the third heat exchanger 13. During heating operation, the refrigerant flows in a direction that closes the check valve 18. Therefore, the refrigerant does not pass through the second heat exchanger 15 (it does not reach the third heat exchanger 13), and the refrigerant sent to the third heat exchanger 13 further absorbs heat from the outside air. The refrigerant that has passed through the third heat exchanger 13 is sent to the compressor 2 again via the four-way valve 5 and circulates around the refrigerant circuit.

Next, the refrigerant circuit when cooling operation is selected will be explained.

When the air conditioning outdoor unit 4 performs cooling operation, the four-way valve 5
to change the direction of refrigerant flow.

At this time, the refrigerant sent from the compressor 2 to the four-way valve 5 is sent from the four-way valve 5 to the third heat exchanger 13. In the third heat exchanger 13, the refrigerant releases heat to the outside air and is cooled. The refrigerant that has passed through the third heat exchanger 13 is then sent to the air conditioning indoor unit 8 via the check valve 18. During the cooling operation, the refrigerant flows in the opposite direction to that during the heating operation, so the check valve 10 is closed. Therefore, during cooling operation, the refrigerant does not pass through the second heat exchanger 15.

The refrigerant sent to the air conditioning indoor unit 8 via the check valve 18 is sent to the indoor heat exchanger 6 via the expansion valve 9. In the indoor heat exchanger 6, the refrigerant absorbs indoor heat and evaporates, thereby cooling the room to which the indoor heat exchanger 6 is attached.

Next, the refrigerant is sent to the compressor 2 again via the check valve 5.
Go around the refrigerant circuit.

On the other hand, cooling water for the internal combustion engine 1 circulates in a cooling water circuit described below. The cooling water sent out from the circulation pump 17 is
into the internal combustion engine 1. Then, the exhaust heat of the internal combustion engine 1 is absorbed, and the warmed cooling water absorbs the exhaust heat of the internal combustion engine 1,
The warmed cooling water is divided into two parts and sent to the respective outdoor heat exchangers 12. Since the cooling water circuits provided in each outdoor heat exchanger 12 are exactly the same, only one side will be explained.

The cooling water that has flowed into the outdoor heat exchanger 12 first passes through the first heat exchanger 15 .

The cooling water that has passed through the first heat exchanger 15 is then sent to the first heat exchanger 14. In the first heat exchanger 14, the cooling water is cooled by releasing engine exhaust heat absorbed from the internal combustion engine 1 into the outside air.

The refrigerant cooled by the first heat exchanger 14 is sent to the circulation pump 17 again and circulates around the cooling water circuit.

The present embodiment having the configuration described above operates as follows.

When the outdoor air conditioning unit 4 performs heating operation, the check valve 10 is in circulation and the check valve 18 is in non-circulation, so the refrigerant from the indoor air conditioning unit 8 is passed through the second heat exchanger 15. It will be sent to the third heat exchanger 13.

On the other hand, the cooling water is flowing to the first heat exchanger 14 via the second heat exchanger 15. The cooling water is cooled by releasing heat to the outside air in the first heat exchanger 14 .

A draft prevention wall 19 is fixed to the surface of the second heat exchanger 15 that comes into contact with the outside air, so that outside air does not flow into the second heat exchanger 15. Therefore, the second heat exchanger 15 does not release the heat of the cooling water to the outside air.
Can be absorbed by refrigerant. In other words, the refrigerant passing through the second heat exchanger 15 only needs to absorb a small amount of heat in the third heat exchanger 13, and the refrigerant passes through the outdoor heat exchanger 1.
2 abilities will improve.

Furthermore, when the air conditioning outdoor unit 4 performs cooling operation,
Since the check valve 10 is in a non-circulating state and the check valve 18 is in a circulating state, the refrigerant is sent from the third heat exchanger 13 to the air conditioning outdoor unit without passing through the second heat exchanger 15.

On the other hand, the cooling water is flowing through the first heat exchanger 14 via the second heat exchanger 15. The cooling water is cooled by releasing heat to the outside air in the first heat exchanger 14 .

A slit 16 is provided between the first heat exchanger 14 and the third heat exchanger 13 to prevent heat exchange from occurring between the first heat exchanger 14 and the third heat exchanger 13. It has become. Therefore, the air exchangers 13 and 14 independently exchange heat with the outside air flowing into the air conditioning outdoor unit 4 by the operation of the fan 20.

〔Effect of the invention〕

As described above, the present invention includes: a compressor that compresses refrigerant; an internal combustion engine that drives the compressor; and an internal combustion engine that is connected to the compressor and drives the compressor in a direction in which the refrigerant flows. a four-way valve that is connected to the compressor and switches the flow direction of the refrigerant; a first heat exchanger that cools the cooling water by discharging the heat of the cooling water of the internal combustion engine to the outside air; and the refrigerant and the a third heat exchanger that exchanges heat with outside air; a second heat exchanger that exchanges heat between the refrigerant and the cooling water; This device is equipped with a refrigerant circuit switching valve that selectively sends refrigerant to a heat exchanger.

Therefore, the refrigerant circuit switching valve changes the flow path of the refrigerant simply by operating the four-way valve, and when the outdoor air conditioning unit performs cooling operation, it is possible to prevent heat exchange between the refrigerant and the cooling water. can.

Therefore, according to the present invention, the heating capacity can be improved without reducing the cooling capacity of the outdoor air conditioning unit.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram depicting an air conditioning outdoor unit according to an embodiment of the present invention. 1... Internal combustion engine 2... Compressor 2a... Pulley 3... Belt 4... Air conditioning outdoor unit 5... Four-way valve 6... Indoor heat exchanger 7... Reverse Stop valve 8... Air conditioning indoor unit 9... Expansion valve 10.18... Check valve (refrigerant circuit switching valve) 11...
Expansion valve 12...Outdoor heat exchanger 13...Third heat exchanger 14...First heat exchanger 15...Second heat exchanger 16...Slit 17...Circulation pump 19 ... Draft prevention wall 20 ... fan

Claims (3)

[Claims] (1) A compressor that compresses refrigerant; an internal combustion engine that drives the compressor; a four-way valve that is connected to the compressor and switches the flow direction of the refrigerant; and releases heat of the cooling water of the internal combustion engine to the outside air. a first heat exchanger that cools the cooling water; a third heat exchanger that exchanges heat between the refrigerant and the outside air; and a second heat exchanger that exchanges heat between the refrigerant and the cooling water. An air conditioning outdoor unit comprising: a refrigerant circuit switching valve that selectively sends refrigerant to the third heat exchanger and the second heat exchanger depending on the direction in which the refrigerant flows. (2) the first heat exchanger, the third heat exchanger, and the second heat exchanger;
The outdoor unit for air conditioning according to claim 1, characterized in that the heat exchanger and the air conditioner are integrally formed. (3) The air conditioning outdoor unit according to claim 1, wherein the first heat exchanger and the third heat exchanger are insulated from each other.