KR20200057362A - Gas engine heat pump - Google Patents

Abstract

The present invention relates to a gas engine heat pump. According to the present invention, the gas engine heat pump comprises: a mixer for discharging a mixture of fuel and air; an engine which burns the mixture discharged from the mixer to drive a plurality of pistons; a turbocharger which compresses the mixture by an exhaust gas discharged from the engine and supplies the mixture to the engine; a compressor connected to the engine and configured to compress refrigerant flowing by the driving of the engine; and a turbine compressor for compressing the refrigerant flowing into the compressor by the exhaust gas discharged from the turbocharger.

Description

Gas engine heat pump {GAS ENGINE HEAT PUMP}

The present invention relates to an apparatus for driving a heat pump with a gas engine.

The heat pump generally means a cycle of supplying heat or absorbing heat where necessary using a circulation cycle of the refrigerant. The heat pump is a device that compresses a refrigerant by driving a compressor, and circulates the compressed refrigerant through a condenser, an expansion valve, and an evaporator to exchange heat with other fluids.

A gas engine heat pump is a device that drives a gas engine to drive a compressor. The engine and the compressor are connected by a belt, and the compressor is driven to circulate the refrigerant in the heat pump.

When driving a gas engine, the exhaust gas burned and discharged from the engine contains a lot of heat, and the discharge pressure may also be considerable. Published patent KR10-2018-0055412 discloses a turbocharger that compresses fuel or a mixer flowing into an engine using exhaust gas discharged from a gas engine.

However, the exhaust gas discharged from the turbocharger still contains a lot of heat and has a high discharge pressure. If the efficiency of the heat pump can be increased by using the exhaust gas discharged from the engine, it can be very helpful for energy saving.

The problem to be solved by the present invention is to provide a gas engine heat pump that utilizes the energy contained in the gas exhausted from the engine.

Another object of the present invention is to provide a gas engine heat pump that increases the efficiency of the heat pump.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the gas engine heat pump according to the present invention, a mixer for discharging a mixture of fuel and air; An engine that burns the mixer discharged from the mixer to drive a plurality of pistons; A turbocharger which compresses the mixer by the exhaust gas discharged from the engine and supplies it to the engine; A compressor connected to the engine and compressing refrigerant flowing through the driving of the engine; Including a turbine compressor for compressing the refrigerant flowing into the compressor by the exhaust gas discharged from the turbocharger, it is possible to compress the refrigerant in two stages by utilizing the gas discharged from the engine.

Further comprising an accumulator for separating the gas phase refrigerant and the liquid refrigerant, and sending the gas phase refrigerant to the compressor, the turbine compressor is disposed between the accumulator and the compressor in the flow direction of the refrigerant, the accumulator Can increase the speed of the refrigerant flowing to the compressor.

Further comprising an exhaust gas heat exchanger for exchanging the exhaust gas discharged from the engine with cooling water, the turbine compressor is disposed between the turbocharger and the exhaust gas heat exchanger in the flow direction of the exhaust gas, discharged from the turbocharger Exhaust gas can be utilized.

The turbine compressor includes a driving unit that rotates by the exhaust gas discharged from the turbocharger, and a refrigerant compression unit that rotates by the driving unit and compresses refrigerant flowing into the compressor. The refrigerant can be compressed by the compression unit.

The turbine compressor includes a turbine driven by exhaust gas; A blade connected to the turbine to rotate and compressing refrigerant flowing into the compressor; And a rotation shaft that transmits the rotational force of the turbine to the blade.

In order to achieve the above object, the gas engine heat pump according to the present invention, an engine for burning a mixer to drive a plurality of pistons; A turbocharger that rotates a turbine with exhaust gas discharged from the engine to compress a mixer supplied to the engine; A turbine compressor that primarily compresses refrigerant flowing by rotating the turbine with exhaust gas discharged from the turbocharger; A compressor that is connected to the engine and is driven and secondarily compresses the refrigerant compressed primarily by the turbine compressor, can compress the refrigerant into two stages by utilizing the gas discharged from the engine.

Details of other embodiments are included in the detailed description and drawings.

According to the gas engine heat pump of the present invention has one or more of the following effects.

First, the advantage of increasing the efficiency of the heat pump by first compressing the refrigerant flowing into the compressor by using the gas exhausted from the engine, without additional electricity consumption, and compressing the refrigerant in two stages without changing the shape inside the compressor. have.

Second, there is an advantage of increasing the discharge flow rate of the compressor by two-stage compression, thereby improving the cycle of the gas engine heat pump with the same amount of refrigerant.

Third, since the refrigerant is compressed in two stages using exhaust gas, it is possible to reduce the number of revolutions of the compressor under the same capability, which in turn reduces the amount of the mixer flowing into the engine, thereby improving engine efficiency. .

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic block diagram of a gas engine heat pump according to an embodiment of the present invention.
2 is a schematic diagram for explaining a structure for compressing a refrigerant in two stages according to an embodiment of the present invention.
3 is a pressure-enthalpy diagram for comparing the gas engine heat pump according to the present invention with a conventional gas engine heat pump.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, a gas engine heat pump according to embodiments of the present invention will be described with reference to the drawings.

<Overall composition and gas engine part>

1 is a schematic block diagram of a gas engine heat pump according to an embodiment of the present invention. Hereinafter, the overall configuration of the gas engine heat pump according to this embodiment will be briefly described with reference to FIG. 1.

The gas engine heat pump according to this embodiment drives the compressor 60 using the engine 30 to circulate the refrigerant in the heat pump II. That is, the gas engine heat pump according to the present embodiment, the gas engine unit (I) for driving the engine 30 with gas fuel, driving the compressor according to the operation of the driven engine 30, the heat to circulate the refrigerant It includes a pump (II), a cooling water circulation unit (III) through which cooling water for cooling the engine (30) circulates.

The gas engine unit I according to the present embodiment is a mixer 14 for discharging a mixture of air and fuel, an engine 30 operating by burning the mixer discharged from the mixer 14, and an engine 30 It includes a turbocharger (20) for compressing the mixer supplied to the engine 30, the exhaust gas heat exchanger (50) for exchanging the exhaust gas discharged from the engine (30) with cooling water.

The engine 30 is an internal combustion engine that operates through the process of burning compressed gas. The engine 30 may rotate the engine-side drive pulley 31 disposed on one side of the engine 30 through four strokes of intake, compression, explosion, and exhaust. The engine-side drive pulley 31 can rotate the compressor-side drive pulley 61 described below.

The engine 30 ignites the supplied fuel, and a plurality of cylinders 36a, 36b, 36c, and 36d that reciprocate the piston therein, connecting rods that change the reciprocating motion of the piston (not shown) into rotational motion. (Not shown) and may include a crankshaft (not shown) that rotates in connection with a connecting rod.

The gas engine unit I according to the present embodiment includes a plurality of throttle valves 38 for adjusting the amount of the mixer supplied to the engine 30 and a mixture supplied through the throttle valve 38 to the engine 30. It may further include an intake manifold 32 to be distributed to each of the cylinder, and the exhaust manifold 34 in which the exhaust gas discharged from the plurality of cylinders (36a, 36b, 36c, 36d) are collected.

A plurality of distribution passages are formed in the intake manifold 32 so as to distribute the fuel supplied to the engine 30 to each of the plurality of cylinders, and the exhaust manifold 34 is connected to each of the plurality of cylinders, and one exhaust A plurality of lamination flow paths that are laminated with a flow path may be formed.

The throttle valve 38 can control the amount of fuel supplied to the engine 30. The throttle valve 38 supplies compressed fuel to the combustion chamber of the engine 30.

The mixer 14 discharges the supplied fuel and air at a constant mixing ratio and supplies it to the engine. The mixer 14 according to the present embodiment is disposed upstream of the turbocharger 20 and supplies a certain proportion of mixed fuel to the turbocharger 20.

The gas engine unit I according to the present embodiment filters the air supplied to the mixer 14 to supply clean air, and a zero gas burner to supply fuel to the mixer 14 at a constant pressure. (10) may be further included.

The air cleaner 12 may block mixing of external air supplied to the engine with moisture and oil in the form of dust and mist using a filter.

The zero governor 10 always supplies fuel at a constant pressure regardless of the pressure of the fuel flowing into the zero governor 10 or the flow rate change. The zero gas burner 10 can obtain a stable outlet pressure over a wide range, and has a function of controlling the pressure of gas fuel supplied to the engine to be substantially constant in the form of atmospheric pressure. In addition, the zero gas burner 10 may be provided with two solenoid valves to block the supplied fuel.

The turbocharger 20 can compress the mixer to a high temperature and high pressure state. The turbocharger 20 rotates the turbine with the power of exhaust gas, compresses the mixer with the rotational force, and sends it to the engine 30.

The turbocharger 20 according to the present embodiment rotates the turbocharger turbine 22 using the exhaust gas discharged from the engine 30, and the turbocharger blade 24 connected to the turbocharger turbine 22 has an engine 30 ) To compress the mixer flowing. The turbocharger turbine 22 and the turbocharger blade 24 may be connected by one rotating shaft 26.

The exhaust gas heat exchanger 50 exchanges heat of exhaust gas discharged from the engine 30 with cooling water. In the exhaust gas heat exchanger 50, the exhaust gas discharged from the engine 30 and the cooling water flowing by the cooling water pump 52 may exchange heat with each other. In this case, the cooling water that has passed through the exhaust gas heat exchanger 50 flows into the engine again, thereby cooling the engine 30.

<Heat pump>

Heat pump (II) according to the present embodiment is a compressor (60) for compressing refrigerant to drive the engine (30), separating gaseous refrigerant and liquid refrigerant, and accumulator (62) for sending gaseous refrigerant to the compressor (60). ), An oil separator (64) for separating oil from the refrigerant discharged from the compressor (60), an outdoor heat exchanger (68) exchanging refrigerant with outdoor air or cooling water, and an indoor unit (80) for controlling indoor air using refrigerant. ), Between the indoor unit 80 and the outdoor heat exchanger 68, the expansion valve 72 for expanding the flowing refrigerant and the refrigerant discharged from the compressor 60, the outdoor heat exchanger 68 or the indoor unit ( 80) further includes a flow path changing valve (66).

The compressor 60 according to this embodiment may be driven by the engine 30. The compressor 60 according to the present embodiment may compress the refrigerant by rotating the engine-side drive pulley 31 and the compressor-side drive pulley 61 connected by the belt 31a.

Two compressors 60 according to the present embodiment may be disposed on both sides of the engine 30. Therefore, the engine-side driving pulley 31 is connected to the compressor-side driving pulley 61 disposed on both sides, so that the two compressors 60 can be driven. This is according to one embodiment, and it is also possible that one compressor 60 is disposed.

The accumulator 62 sends a gaseous refrigerant among the refrigerant flowing through the flow path changing valve 66 to the compressor 60. In the accumulator 62, the liquid refrigerant and the gas phase refrigerant are separated, and as the gas phase refrigerant is discharged, the refrigerant circulation may function as a resistor.

The oil separator 64 may separate the oil mixed with the refrigerant discharged from the compressor 60 and send it back to the compressor 60.

The outdoor heat exchanger 68 may include an outdoor fan 69 to exchange heat with the outdoor air. In addition, the outdoor heat exchanger 68 may exchange heat with the cooling water that cools the engine 30 to promote phase change of the refrigerant. In the case of heat exchange with cooling water, a plate heat exchanger can be used.

The flow path changing valve 66 according to the present embodiment may be sent to the outdoor heat exchanger 68 discharged from the compressor 60 or to the indoor unit 80 according to the operation mode of the heat pump.

The indoor unit 80 includes an indoor heat exchanger (not shown) and an indoor fan (not shown) to exchange heat between the indoor air and the refrigerant flowing through the indoor heat exchanger to control the temperature of the indoor space.

<Cooling water circulation part>

The cooling water circulation unit III according to the present embodiment may circulate cooling water through the cooling water pump 52 to cool the engine 30. Cooling water circulation unit (III) according to the present embodiment may be supplied to the engine 30, the cooling water flowing by the cooling water pump 52 passes through the exhaust gas heat exchanger (50).

<Turbocharger and turbine compressor>

2 is a schematic diagram for explaining a structure for compressing a refrigerant in two stages according to an embodiment of the present invention. 3 is a pressure-enthalpy diagram for comparing the gas engine heat pump according to the present invention with a conventional gas engine heat pump.

Hereinafter, the configuration, arrangement and effect of the turbocharger and the turbine compressor of the gas engine heat pump according to this embodiment will be described with reference to FIGS. 2 to 3.

The gas engine heat pump according to this embodiment uses the turbocharger 20 to compress the mixer supplied to the engine 30 as the exhaust gas discharged from the engine 30 and the exhaust gas discharged from the turbocharger 20 It includes a turbine compressor 40 for compressing the refrigerant flowing into the compressor (60).

The turbocharger 20 is connected to the engine 30, rotates the turbocharger turbine 22 with high-pressure exhaust gas discharged from the engine 30, and the turbocharger connected to the turbocharger turbine 22 and the rotating shaft 26 By rotating the blade 24, the mixer supplied to the engine 30 can be compressed.

The turbocharger 20 according to the present exemplary embodiment may include a turbocharger turbine chamber 23 in which a turbocharger turbine 22 is disposed, and a mixer compression chamber 25 in which a turbocharger blade 24 is disposed. In the turbocharger turbine chamber 23, an inlet 23a through which exhaust gas flows is formed in a radial direction of the turbocharger turbine 22, and an outlet 23b through which exhaust gas is discharged is rotated in the direction of the rotation axis of the turbocharger turbine 22 It can be formed as.

In the mixer compression chamber 25, the inlet 25a through which the mixer is introduced is formed in the rotational axis direction of the turbocharger blade 24, and the discharge port 25b through which the mixer is discharged is formed in the radial direction of the turbocharger blade 24. Can be.

The turbocharger turbine chamber 23 is disposed between the engine 30 and the turbine compressor 40, drives the turbocharger 20 with exhaust gas discharged from the engine 30, and exhausts the turbine compressor 40. Exhaust the gas. The mixer compression chamber 25 is disposed between the mixer 14 and the engine 30 to compress the mixer mixed with the mixer 14 and supply it to the engine 30. In addition, the gas engine heat pump according to the present embodiment is arranged by intercooler (not shown) between the mixer compression chamber 25 and the engine 30 to cool the hot mixer supplied to the engine 30 to cool the engine 30 Can be supplied.

The turbine compressor 40 according to the present embodiment is disposed between the turbocharger 20 and the exhaust gas heat exchanger 50 in the flow direction of the exhaust gas rise. The turbine compressor 40 according to the present embodiment is disposed between the accumulator 62 and the compressor 60 in the flow direction of the refrigerant. The turbine compressor 40 can thus increase the speed of the refrigerant flowing into the compressor 60 or the amount of refrigerant.

Turbine compressor 40 according to the present embodiment is a driving unit 42 rotating by the exhaust gas discharged from the turbocharger 20, and connected to the driving unit 42, rotates, cools the refrigerant flowing into the compressor 60 And a refrigerant compressing portion 46 for compressing.

The driving unit 42 includes a turbine 44 driven by exhaust gas and a turbine chamber 45 in which the turbine 44 is disposed, and the turbine chamber 45 includes an intake port 45a through which exhaust gas is introduced. It is formed in the radial direction of 44), the outlet 45b through which the exhaust gas is discharged may be formed in the rotation axis direction of the turbine 44.

The refrigerant compression unit 46 includes a blade 48 that is connected to the turbine 44 and rotates, and a refrigerant compression chamber 49 in which the blade 48 is disposed, and the refrigerant is introduced into the refrigerant compression chamber 49. The inlet port 49a is formed in the rotational axis direction of the blade 48, and the discharge port 49b through which the refrigerant is discharged may be formed in the radial direction of the blade 48.

The turbine 44 and the blade 48 may be connected through a rotating shaft 43. Therefore, the rotating shaft 43 can transmit the rotational force of the turbine 44 to the blade 48.

3, the gas engine heat pump according to the present embodiment increases the flow rate and pressure of the refrigerant discharged from the compressor (30). As a result, it can lead to an improvement in heating and cooling performance within the system. In addition, it is possible to reduce the number of revolutions of the compressor under the same ability, which can reduce the amount of the mixer flowing into the engine.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the above-described specific embodiments, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

14: Mixer 20: Turbocharger
22: turbocharger turbine 24: turbocharger blade
30: engine 40: turbine compressor
42: drive unit 44: turbine
46: refrigerant compression section 48: blade
50: exhaust heat exchanger 60: compressor
62: accumulator

Claims (6)

A mixer for discharging a mixture of fuel and air;
An engine that burns the mixer discharged from the mixer to drive a plurality of pistons;
A turbocharger which compresses the mixer by the exhaust gas discharged from the engine and supplies it to the engine;
A compressor connected to the engine and compressing refrigerant flowing through the driving of the engine;
Gas engine heat pump including a turbine compressor for compressing the refrigerant flowing into the compressor by the exhaust gas discharged from the turbocharger. According to claim 1,
Further comprising an accumulator for separating the gas phase refrigerant and liquid refrigerant, and sending the gas phase refrigerant to the compressor,
The turbine compressor is a gas engine heat pump disposed between the accumulator and the compressor in the flow direction of the refrigerant. According to claim 1,
Further comprising an exhaust gas heat exchanger for exchanging the exhaust gas discharged from the engine with cooling water,
The turbine compressor is a gas engine heat pump disposed between the turbocharger and the exhaust gas heat exchanger in the flow direction of the exhaust gas. According to claim 1,
The turbine compressor,
A gas engine heat pump including a driving unit rotating by the exhaust gas discharged from the turbocharger, and a refrigerant compression unit rotating by the driving unit and compressing refrigerant flowing into the compressor. According to claim 1,
The turbine compressor,
A turbine driven by exhaust gas;
A blade connected to the turbine to rotate and compressing refrigerant flowing into the compressor;
Gas engine heat pump including a rotating shaft for transmitting the rotational force of the turbine to the blade. An engine that combusts a mixture of air and fuel to drive a plurality of pistons;
A turbine compressor that primarily compresses refrigerant flowing by rotating the turbine with exhaust gas discharged from the engine;
A gas engine heat pump including a compressor that is connected to the engine and is driven and secondarily compresses refrigerant compressed primarily by the turbine compressor.

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