JP6425579B2 - Ejector cycle - Google Patents

Description

  According to the present invention, a compressor for compressing a gas phase refrigerant, a heat radiating portion for cooling a high pressure refrigerant discharged from the compressor, an evaporation portion for evaporating a liquid phase refrigerant and a high pressure refrigerant from the heat radiating portion are decompressed and expanded. And an ejector for raising the pressure while mixing the drawn refrigerant with the drawn refrigerant and the drawn refrigerant and a gas phase refrigerant that causes the gas-liquid mixed refrigerant from the ejector to flow to the compressor. An ejector provided with a gas-liquid separation unit that separates into liquid phase refrigerant to be flowed to the evaporation unit, and a heating unit that heats a gas phase refrigerant that is separated by the gas-liquid separation unit and flows into the compressor On the cycle.

  Since the ejector cycle is provided with the ejector, the suction pressure of the compressor can be increased to improve the energy consumption efficiency (COP), and the refrigerant flowing to the evaporation section becomes a liquid phase, so evaporation can occur. Since the performance of the evaporation part can be improved by reducing the pressure loss and increasing the heat transfer coefficient in the part, the energy consumption efficiency (COP) can be improved also from this point.

  In addition, since a heating unit for heating the gas phase refrigerant separated in the gas-liquid separation unit and flowing to the compressor is provided, the degree of superheat of the gas phase refrigerant flowing to the compressor is secured, and It is possible to properly prevent the occurrence of troubles such as compression.

As a conventional example of such an ejector cycle, there is one configured to flow the high-pressure refrigerant that has passed through the heat radiating portion to the ejector after flowing through the heating portion (see, for example, Patent Document 1).
That is, the heating unit is configured to heat the gas phase refrigerant flowing to the compressor by the high pressure refrigerant that has passed through the heat radiating unit.

In addition, various forms other than the above-mentioned structure are described in patent document 1 as a structure of a heating part.
That is, when the hot water of the hot water storage tank is circulated and caused to flow through the heat dissipation unit, the heating unit heats the gas phase refrigerant flowing to the compressor by the hot water flowing from the hot water storage tank toward the heat dissipation unit. The heating unit is configured to heat the gas-phase refrigerant flowing to the compressor using the remaining hot water in the bath, and the compressor is driven by the electric motor Each of the forms is described wherein the heating unit is configured to heat the gas phase refrigerant flowing to the compressor using the heat of the electric motor.

As another conventional example of an ejector cycle, there is one in which a heating unit is configured to heat a gas-phase refrigerant flowing in a compressor using outdoor air (see, for example, Patent Document 2).
In Patent Document 2, the heating unit heats the gas-phase refrigerant flowing to the compressor using outdoor air, and the gas-phase refrigerant flowing to the compressor by the high-pressure refrigerant that has passed through the heat radiation unit. It has also been described that it is configured to include a heating portion to be heated.

Patent No. 3322263 JP 2004-3804 A

  In the ejector cycle, the compressor can be configured to be driven by an engine, and a supercharged engine equipped with a supercharger that supplies compressed air for combustion may be used as the engine.

  When supplying compressed air from the turbocharger to the engine, generally, an intercooler for cooling the compressed air supplied from the turbocharger is provided to reduce the temperature of the compressed air supplied to the engine, The mixture density will be increased to improve the output of the engine.

  However, although the intercooler is generally configured in the form of external air ventilation that cools by external air, such an intercooler has a sufficient temperature of the compressed air due to the high temperature of the external air. It can not be reduced, and it is desirable to sufficiently cool the compressed air supplied from the turbocharger to the engine in order to improve the output of the engine.

  The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an engine for driving a compressor with a turbocharger for supplying compressed air for combustion to the engine. An object of the present invention is to provide an ejector cycle capable of sufficiently reducing the temperature of supplied compressed air to improve the output of the engine.

The ejector cycle according to the present invention comprises a compressor for compressing a gas phase refrigerant, a heat radiating portion for cooling high pressure refrigerant discharged from the compressor, an evaporation portion for evaporating liquid phase refrigerant, and high pressure refrigerant from the heat radiating portion. An ejector for increasing the pressure while suctioning the refrigerant from the evaporation section by decompressing and expanding it and mixing the drawn refrigerant with the refrigerant, and a gas that causes the gas-liquid mixed refrigerant from the ejector to flow to the compressor A gas-liquid separation unit for separating into a phase refrigerant and a liquid-phase refrigerant flowing to the evaporation unit; and a heating unit for heating a gas-phase refrigerant separated in the gas-liquid separation unit and flowing to the compressor And their characteristic configuration is
A supercharger is provided which supplies compressed air for combustion to an engine which drives the compressor.
Compressed air supplied from the supercharger is configured to flow to the engine after flowing through the heating unit.

  That is, the compressed air from the turbocharger supplied to the engine for driving the compressor is configured to flow to the engine after flowing through the heating unit, and the heating unit is configured to compress the compressed air supplied from the turbocharger By heating the gas-phase refrigerant flowing to the compressor with the heat held by B, the superheat degree of the gas-phase refrigerant flowing to the compressor is secured.

  And, since the temperature of the gas phase refrigerant flowing to the compressor is sufficiently lower than the temperature of the outside air, the compressed air supplied from the turbocharger heats the gas phase refrigerant flowing to the compressor. As a result, the temperature is sufficiently lowered, and the compressed air whose temperature is thus lowered is supplied to the engine, so that the output of the engine can be improved.

  That is, by heating the gas phase refrigerant flowing to the compressor with compressed air supplied from the turbocharger to the engine, the supercharging of the gas phase refrigerant flowing to the compressor can be secured while maintaining the superheat degree. The temperature of the compressed air supplied from the aircraft to the engine can be sufficiently reduced to improve the output of the engine.

  In short, according to the characterizing feature of the ejector cycle of the present invention, in the case of providing the engine for driving the compressor with the turbocharger for supplying the compressed air for combustion, the temperature of the compressed air supplied from the turbocharger to the engine Can be reduced sufficiently to improve the output of the engine.

Further, a further characteristic configuration of the ejector cycle of the present invention is
An intercooler is provided to cool the compressed air supplied from the supercharger,
The compressed air after passing through the intercooler is configured to flow to the engine after flowing through the heating unit.

  That is, after the compressed air supplied from the supercharger is cooled by the intercooler, the temperature of the compressed air can be greatly reduced by cooling by the heating unit, and the output of the engine can be properly improved. it can.

  In short, according to the further characterizing feature of the ejector cycle of the present invention, the output of the engine can be properly improved.

Further features of the ejector cycle of the present invention are:
An auxiliary heating unit for heating a gas phase refrigerant is provided downstream of the heating unit and upstream of the compressor.
An engine coolant that recovers the exhaust heat of the engine is configured to circulate and flow via the auxiliary heating unit.

  That is, in addition to heating the gas phase refrigerant flowing into the compressor by the heating unit heated by the heat held by the compressed air supplied to the engine, the exhaust heat of the engine was recovered by the auxiliary heating unit By heating the gas phase refrigerant flowing to the compressor with heat held by the engine coolant, the superheat degree of the gas phase refrigerant flowing to the compressor is secured.

  That is, the degree of superheat of the gas phase refrigerant flowing to the compressor is sufficient only by heating the gas phase refrigerant flowing to the compressor with the heat held by the compressed air supplied from the turbocharger in the heating unit. Even if it can not be increased, the gas phase refrigerant flowing to the compressor is heated by the auxiliary heating unit using the heat possessed by the engine coolant that recovers the exhaust heat of the engine driving the compressor. Thus, the degree of superheat of the gas-phase refrigerant flowing to the compressor can be properly secured.

  In short, according to the characteristic configuration of the ejector cycle of the present invention, it is possible to appropriately ensure the degree of superheat of the gas phase refrigerant flowing to the compressor.

Further features of the ejector cycle of the present invention are:
The cooling fluid circulating through the evaporation unit is configured to flow via the cooling heat radiation unit.

That is, the cooling liquid that circulates and flows through the evaporation unit is configured to flow via the cooling heat radiation unit, and the ejector cycle is used as a so-called cooling operation mode.
That is, for example, the ejector cycle is used as a cooling operation mode such as cooling, such as cooling the space to be air-conditioned by the heat dissipation unit for cooling.

  As described above, when the ejector cycle is used as the cooling operation mode, the gas flowing to the compressor is heated by heating the gas phase refrigerant flowing to the compressor with the compressed air supplied from the supercharger to the engine While ensuring the degree of superheat of the phase refrigerant, the temperature of the compressed air supplied from the supercharger to the engine can be sufficiently lowered to improve the output of the engine.

  In short, according to the characteristic configuration of the ejector cycle of the present invention, when the ejector cycle is used as a cooling operation mode, the supercharger supplies the engine with the superheat degree while securing the degree of superheat of the gas phase refrigerant flowing to the compressor. By sufficiently reducing the temperature of the compressed air, the power of the engine can be improved.

The figure which shows the structure of the ejector cycle of 1st Embodiment Schematic of the ejector The figure which shows the structure of the ejector cycle of 2nd Embodiment

First Embodiment
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
(Overall configuration of ejector cycle)
As shown in FIG. 1, in the ejector cycle, a compressor 1 for compressing a gas phase refrigerant, a radiator 2 for cooling high pressure refrigerant discharged by the compressor 1, and an evaporator 3 for evaporating liquid phase refrigerant An ejector 4 for increasing the pressure while decompressing and expanding the high-pressure refrigerant from the heat release unit 2 and sucking the refrigerant from the evaporation unit 3 and mixing the drawn refrigerant with the drawn refrigerant; and air from the ejector 4 A gas-liquid separation unit 5 that separates the liquid mixed refrigerant into a gas-phase refrigerant that causes the compressor 1 to flow and a liquid-phase refrigerant that causes the evaporation unit 3 to flow; The heating part 6 which heats the gas phase refrigerant to be carried out is provided.

In the present embodiment, the auxiliary heating unit 7 for heating the gas phase refrigerant heated by the heating unit 6 is provided downstream of the heating unit 6 and upstream of the compressor 1, and a gas-liquid separation unit The pressure reducing unit 8 is disposed between the pressure unit 5 and the evaporating unit 3.
Further, in the present embodiment, the compressor 1 is configured to be driven by the engine E. The engine E which drives the compressor 1 is a gas engine provided with a supercharger K in this embodiment, and the details will be described later.

  As shown in FIG. 2, the ejector 4 decompresses and expands the high-pressure refrigerant from the heat dissipation unit 2 and sucks the refrigerant from the evaporation unit 3. The pressure is reduced while mixing the decompressed refrigerant and the sucked refrigerant. A mixing unit 4b to be raised and a diffuser unit 4c to decrease the flow velocity of the mixed refrigerant to raise the pressure are configured.

  Therefore, the first flow path R1 connecting the compressor 1 and the heat dissipation portion 2 and the second flow path R2 connecting the heat dissipation portion 2 and the ejector 4 flow the high-pressure refrigerant, and the ejector 4 and the gas-liquid separation Third flow path R3 connecting the portion 5; fourth flow path R4 connecting the gas-liquid separation portion 5 and the compressor 1 via the heating portion 6 and the auxiliary heating portion 7; A fifth flow path R5 connecting the pressure reduction section 8 and the pressure reduction section 8 flows a medium pressure refrigerant, and a sixth flow path R6 connects the pressure reduction section 8 and the evaporation section 3, and the evaporation section 3 and the ejector 4 The seventh flow passage R7 to be connected is configured to flow the low pressure refrigerant.

  In the present embodiment, the heat radiating portion 2 is configured as an outdoor air ventilation type heat exchanger which ventilates an external air for cooling and performs a cooling operation.

(About the cooling operation mode)
The first fluid passage L1 connecting the evaporation unit 3 and the cooling heat radiation unit 9 for air conditioning, and the second flow passage L2 connecting the cooling radiation unit 9 and the evaporation unit 3 cause the cooling liquid to flow Thus, the circulation pump 10 for circulating the cooling fluid is provided in the first fluid passage L1.
Therefore, the cooling liquid is configured to circulate and flow through the first flow passage L1 and the second flow passage L2.

That is, the evaporator 3 is configured to exchange heat between the low pressure refrigerant supplied through the sixth flow passage R6 and the cooling liquid to cool the cooling liquid with the low pressure refrigerant, and to pass through the evaporator 3 The circulating cooling fluid is circulated through the cooling heat radiating portion 9 for air conditioning, and the cooling heat radiating portion 9 cools the space to be air conditioned.
Therefore, in the present embodiment, the ejector cycle is configured to operate in the cooling operation mode in which cooling is performed.

(About the engine)
An engine cooling circulation path Ja connecting a cooling jacket of an engine E driving the compressor 1 and an engine cooling radiator 11, and an engine cooling pump 12 circulating an engine coolant through the engine cooling circulation path Ja It is provided and it is comprised so that engine E may be cooled.

The supercharger K is configured as a so-called turbo supercharger including a turbine Kt driven by the exhaust gas discharged from the combustion chamber of the engine E through the exhaust gas passage 14.
The compressor Kc, which rotates integrally with the turbine Kt, is configured to supply compressed air obtained by compressing combustion air to the combustion chamber of the engine E through the air supply passage 15.

  In the present embodiment, a mixer 16 such as a venturi mixer or the like for mixing gas fuel such as city gas with respect to the combustion air sucked into the compressor Kc is provided, and the gas fuel is mixed with the combustion air. The mixed gas is supplied to the combustion chamber of the engine E while being compressed by the compressor.

  The air supply passage 15 is provided with a throttle valve 17 for adjusting the flow rate of the mixed gas so that the output of the engine E can be adjusted.

(About heating part)
An air supply passage 15 connecting the compressor Kc of the turbocharger K and the engine E is provided via the heating unit 6, and after the mixed gas compressed by the compressor Kc flows through the heating unit 6, The engine E is configured to flow.

  Therefore, the heating unit 6 compresses the gas phase refrigerant flowing from the gas-liquid separation unit 5 to the compressor 1 by the heat held by the mixed gas compressed by the compressor Kc of the turbocharger K, thereby compressing the refrigerant. It is comprised so that the superheat degree of the gaseous-phase refrigerant | coolant which flows into the apparatus 1 may be ensured.

  Then, since the temperature of the gas phase refrigerant flowing to the compressor 1 is sufficiently lower than the temperature of the outside air, the mixed gas supplied from the turbocharger K is a gas phase refrigerant flowing to the compressor 1 By heating, the temperature is sufficiently lowered, and the mixed gas whose temperature is lowered as such is supplied to the engine E, so the output of the engine E can be improved.

  That is, by heating the gas phase refrigerant flowing to the compressor 1 with compressed air (mixed gas) supplied from the supercharger K to the engine E, the degree of superheat of the gas phase refrigerant flowing to the compressor 1 is calculated. The output of the engine E can be improved by sufficiently reducing the temperature of the compressed air (mixed gas) supplied from the turbocharger K to the engine while ensuring the same.

(About the auxiliary heating unit)
The branch channel Jb branched from the engine cooling circulation passage Ja causes a portion of the engine cooling fluid flowing in the engine cooling circulation passage Ja to flow to the auxiliary heating unit 7 and the engine cooling fluid that has passed through the auxiliary heating unit 7 Is returned to the engine cooling circulation passage Ja, and the engine coolant that recovers the exhaust heat of the engine E is configured to circulate and flow via the auxiliary heating unit 7.

  Further, a branch control valve 13 is provided to adjust the amount of engine coolant that is branched from the engine cooling circulation path Ja to the branch path Jb, and the amount of engine coolant passing through the auxiliary heating unit 7 can be set to an appropriate amount. Is configured as.

  Therefore, after the gas phase refrigerant flowing to the compressor 1 is heated by the heating unit 6, the heat generated by the engine coolant that recovers the exhaust heat of the engine E driving the compressor 1 in the auxiliary heating unit 7 It is constituted so that it can heat using.

  That is, only by heating the gas phase refrigerant flowing to the compressor 1 with the heat held by the mixed gas supplied from the supercharger K in the heating unit 6, the gas phase refrigerant flowing to the compressor 1 is Even when the degree of superheat can not be sufficiently increased, the engine cooling fluid that recovers the exhaust heat of the engine E that drives the compressor 1 with the auxiliary heating unit 7 is a gas phase refrigerant flowing to the compressor 1. By heating using the held heat, the superheat degree of the gas phase refrigerant flowing to the compressor 1 can be appropriately secured.

Second Embodiment
Next, a second embodiment will be described. The second embodiment shows another embodiment of the heating unit 6, and the other configuration is the same as that of the first embodiment. Only parts different from the embodiment will be described, and the same configuration as that of the first embodiment will be assigned the same reference numeral as that of the first embodiment and the detailed description will be omitted.

  That is, as shown in FIG. 3, in the second embodiment, as in the first embodiment, the cooling fluid circulating through the evaporation unit 3 circulates through the cooling heat radiation unit 9 for air conditioning. The ejector cycle is configured to operate as a cooling operation mode for cooling.

  Further, in the second embodiment, a heating unit 6 in which the mixed gas supplied from the supercharger K flows and an auxiliary heating unit 7 in which the engine coolant flows are provided.

The second embodiment is different from the first embodiment in that the mixed gas compressed by the turbocharger K is cooled in a portion corresponding to the space between the turbocharger K and the heating unit 6 in the air supply passage 15. Intercooler 18 is provided.
That is, the mixed gas that has passed through the intercooler 18 is configured to flow to the engine E after flowing through the heating unit 6.
In addition, although the air-cooling system which cools by external air is illustrated as an example as the intercooler 18 in this embodiment, the water cooling system which cools with cold water is also employable.

  Therefore, in the second embodiment, after the mixed gas compressed by the turbocharger K can be cooled by the heating unit 6 after being cooled by the intercooler 18, the mixture supplied from the turbocharger K can be mixed. Since the temperature of the gas is sufficiently lowered to supply the mixed gas whose temperature is sufficiently lowered to the engine E, the output of the engine E can be appropriately improved.

  Incidentally, since the mixed gas compressed by the turbocharger K is cooled by the intercooler 18 and the heating unit 6, the gas phase refrigerant flowing to the compressor 1 is supercharged by the heating unit 6. Only by heating with the heat held by the mixed gas supplied from the machine K, the degree of superheat of the gas-phase refrigerant flowing to the compressor 1 can not be sufficiently increased, but it flows to the compressor 1 The gas phase refrigerant flowing to the compressor 1 by heating the gas phase refrigerant in the auxiliary heating unit 7 using the heat possessed by the engine coolant that recovers the exhaust heat of the engine E that drives the compressor 1 The degree of superheat of can be properly secured.

[Another embodiment]
Next, another embodiment will be listed.
(1) In the first and second embodiments, a gas engine has been exemplified as the engine E, but various engines such as a diesel engine and a gasoline engine can be applied as the engine E.

(2) In the first and second embodiments, the case where the turbocharger K compresses the mixed gas of the air for combustion and the gas fuel is illustrated, but the air for combustion by the turbocharger K is illustrated. You may implement in the form which only compresses. In this case, the fuel may be injected into the compressed air supplied from the turbocharger K to the engine E or into the combustion chamber of the engine E.

(3) In the first and second embodiments, a so-called turbo-type supercharger driven by the exhaust gas of the engine E has been exemplified as the supercharger K, but as the supercharger K, an engine You may make it use the supercharger of the form rotationally driven by E.

(4) In the first and second embodiments, the auxiliary heating unit 7 for heating with the engine coolant is provided in addition to the heating unit 6, but the heating action of the heating unit 6 causes compression. In the case where the degree of superheat of the gas phase refrigerant flowing to the device 1 can be appropriately secured, the auxiliary heating unit 7 may be omitted.

(5) In the first and second embodiments, as the cooling operation mode, the case of performing cooling is illustrated, but, for example, the cooling operation mode such as cooling the cold storage room by the cooling heat radiating portion 9 The subject of cooling in can be changed variously.

(6) In the first and second embodiments, the ejector cycle executes only the cooling operation mode, but the ejector cycle may be switched between the cooling operation mode and the heating operation mode such as heating. The present invention is also applicable to the case where

  The configurations disclosed in the above embodiment (including the other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in the present specification is an exemplification, and the embodiment of the present invention is not limited thereto, and can be appropriately modified without departing from the object of the present invention.

Reference Signs List 1 compressor 2 heat dissipation unit 3 evaporation unit 4 ejector 4a nozzle unit 4b mixing unit 4c diffuser unit 5 gas-liquid separation unit 6 heating unit 7 auxiliary heating unit 9 cooling heat radiation unit E engine K supercharger

Claims (4)

A compressor for compressing a gas phase refrigerant, a heat radiating unit for cooling a high pressure refrigerant discharged from the compressor, an evaporation unit for evaporating a liquid phase refrigerant, and a high pressure refrigerant from the heat radiating unit under reduced pressure and expanding And a ejector for raising the pressure while mixing the drawn refrigerant with the drawn refrigerant and the drawn refrigerant, a gas phase refrigerant that causes the gas-liquid mixed refrigerant from the ejector to flow to the compressor, and the evaporation section The ejector cycle is provided with a gas-liquid separation unit that separates into liquid phase refrigerant to be flowed, and a heating unit that heats the gas phase refrigerant separated in the gas-liquid separation unit and flowing to the compressor. ,
A supercharger is provided which supplies compressed air for combustion to an engine which drives the compressor.
An ejector cycle, wherein compressed air supplied from the supercharger is configured to flow to the engine after flowing through the heating unit. An intercooler is provided to cool the compressed air supplied from the supercharger,
The ejector cycle according to claim 1, wherein compressed air after passing through the intercooler is configured to flow to the engine after flowing through the heating unit. An auxiliary heating unit for heating a gas phase refrigerant is provided downstream of the heating unit,
The ejector cycle according to claim 1 or 2, wherein an engine coolant that recovers the exhaust heat of the engine is configured to circulate and flow via the auxiliary heating unit.   The ejector cycle according to any one of claims 1 to 3, wherein the cooling liquid circulating and flowing through the evaporation unit is configured to flow via the cooling heat radiation unit.

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