WO2014162520A1

WO2014162520A1 - Refrigeration cycle device

Info

Publication number: WO2014162520A1
Application number: PCT/JP2013/060102
Authority: WO
Inventors: 真哉東井上
Original assignee: 三菱電機株式会社
Priority date: 2013-04-02
Filing date: 2013-04-02
Publication date: 2014-10-09
Also published as: JP6072899B2; WO2014162764A1; JPWO2014162764A1

Abstract

A refrigeration cycle device comprising: a first refrigerant channel in which a compressor (101), a condenser (102), a first expansion valve (103), a first evaporator (104), and a refrigerant intake port (205) of an ejector (107) are connected by refrigerant tubes; and a second refrigerant channel branching between the condenser (102) and the first expansion valve (103), in which a refrigerant inflow port (204) of the ejector (107), a refrigerant outflow port (206) of the ejector (107), a second evaporator (108), and the compressor (101) are connected by refrigerant tubes; a second expansion valve (105) and an air bubble miniaturizing means (106) for miniaturizing air bubbles in the refrigerant flowing out of the second expansion valve (105) being sequentially connected between the condenser (102) and the refrigerant inflow port (204) of the ejector (107) in the second refrigerant channel.

Description

Refrigeration cycle equipment

The present invention relates to a refrigeration cycle apparatus having an ejector.

The refrigeration cycle apparatus described in Patent Document 1 includes a compressor, a condenser, bubble generating means, an ejector, and an evaporator, and bypasses part of the gas refrigerant discharged from the compressor to the bubble generating means. Then, the bubble generating means causes the gas refrigerant discharged from the compressor to flow into the liquid refrigerant flowing out of the condenser to generate bubbles. Thereby, mixing of the driving fluid and the suction fluid in the ejector is promoted, and the efficiency of the ejector is improved.

JP 2008-202812 (Abstract)

However, in the technique of Patent Document 1, the gas refrigerant discharged from the compressor is branched and flows into the bubble generating means. For this reason, while the refrigerating capacity in an evaporator falls, the freezing effect also reduces. As a result, there existed a subject that the refrigerating capacity and energy efficiency of a refrigerating cycle device fell.
Furthermore, in order to compensate for the decrease in the refrigerating capacity in the evaporator, it is necessary to increase the circulating frequency of the refrigerant by increasing the drive frequency of the compressor, and there is a problem that the energy efficiency of the refrigerating cycle apparatus decreases.

The present invention has been made to solve the above problems, and an object thereof is to obtain a refrigeration cycle apparatus capable of improving the efficiency of an ejector.
Another object of the present invention is to obtain a refrigeration cycle apparatus capable of improving the refrigeration capacity and energy efficiency.

A refrigeration cycle apparatus according to the present invention includes a compressor, a condenser, a first expansion valve, a first evaporator, and a first refrigerant flow path in which refrigerant suction ports of an ejector are connected by a refrigerant pipe; the condenser; A second refrigerant flow path branching between the first expansion valve, a refrigerant inlet of the ejector, a refrigerant outlet of the ejector, a second evaporator, and the compressor connected by a refrigerant pipe; And the second expansion valve and the bubbles contained in the refrigerant flowing out of the second expansion valve are refined between the condenser and the refrigerant inlet of the ejector in the second refrigerant flow path. The bubble refinement means is connected sequentially.

In the present invention, the second expansion valve and the bubble refining means are sequentially connected between the condenser and the refrigerant inlet of the ejector in the second refrigerant flow path.
For this reason, this invention can improve the efficiency of an ejector. Moreover, this invention can improve refrigerating capacity and energy efficiency.

2 is a refrigerant circuit diagram of the refrigeration cycle apparatus in Embodiment 1. FIG. It is a figure which shows the structure and internal pressure distribution of the ejector 107 of the refrigerating-cycle apparatus in Embodiment 1. FIG. 3 is a diagram showing an outline of the configuration of a first evaporator 104 and a second evaporator 108 of the refrigeration cycle apparatus in Embodiment 1. FIG. 2 is a diagram showing an outline of the configuration of a condenser 102 of the refrigeration cycle apparatus in Embodiment 1. FIG. FIG. 3 is a Mollier diagram showing the operating state of the refrigeration cycle apparatus in the first embodiment. It is a figure which shows typically the structure of the bubble refinement | miniaturization means 106 of the refrigeration cycle apparatus in Embodiment 2. FIG. FIG. 6 is a diagram schematically showing a configuration of a bubble refining means 106 of a refrigeration cycle apparatus in a third embodiment. It is a figure which shows typically the structure of the bubble refinement | miniaturization means 106 of the refrigeration cycle apparatus in Embodiment 4. FIG. It is a figure which shows typically the structure of the mixer 805 of the refrigerating-cycle apparatus in Embodiment 4. FIG.

Embodiment 1 FIG.
(Refrigerant circuit)
1 is a refrigerant circuit diagram of a refrigeration cycle apparatus according to Embodiment 1. FIG.
The refrigeration cycle apparatus shown in FIG. 1 includes a compressor 101, a condenser 102, a first expansion valve 103, a first evaporator 104, a second expansion valve 105, a bubble refining means 106, an ejector 107, and a second evaporator. 108.
These element parts and the refrigerant pipe for connecting the element parts are housed in the casing of the outdoor unit 100.

The compressor 101, the condenser 102, the first expansion valve 103, the first evaporator 104, and the refrigerant suction port of the ejector 107 are sequentially connected by a refrigerant pipe to form a first refrigerant flow path.
Further, the condenser 102 and the first expansion valve 103 are branched, the second expansion valve 105, the bubble refining means 106, the refrigerant inlet of the ejector 107, the refrigerant outlet of the ejector 107, the second evaporator 108, And the compressor 101 are sequentially connected by a refrigerant pipe to form a second refrigerant flow path.
That is, the second expansion valve 105, the bubble refining means 106, and the ejector 107 are connected in series to the second refrigerant flow path.
The second expansion valve 105 decompresses the refrigerant branched from between the condenser 102 and the first expansion valve 103 into a gas-liquid two-phase refrigerant.
The bubble refiner 106 refines bubbles contained in the gas-liquid two-phase refrigerant that has flowed out of the second expansion valve 105.

Pipes are connected to the first evaporator 104 and the second evaporator 108 so that the flow directions of the refrigerant and the heat medium (for example, water) face each other. The first evaporator 104 and the second evaporator 108 are connected to the indoor heat exchanger 111 of the indoor unit 110 on the heat load side, and a water feeder 109 for conveying the heat medium is connected.

1 will be described in more detail.

(Ejector 107)
FIG. 2 is a diagram showing the configuration of the ejector 107 and the internal pressure distribution of the refrigeration cycle apparatus in the first embodiment.
The ejector 107 has a refrigerant inlet 204, a refrigerant suction port 205, and a refrigerant outlet 206.
The refrigerant inlet 204 is connected to the bubble refining means 106 by a refrigerant pipe. The driving refrigerant flows into the refrigerant inlet 204.
The refrigerant suction port 205 is connected to the first evaporator 104 by a refrigerant pipe. The refrigerant sucked by the driving refrigerant flows into the refrigerant suction port 205.
The refrigerant outlet 206 is connected to the second evaporator 108 by a refrigerant pipe. The refrigerant outlet 206 flows out the mixed refrigerant in which the driving refrigerant and the suction refrigerant are mixed.

The ejector 107 includes a nozzle unit 201, a mixing unit 202, and a diffuser unit 203. The nozzle part 201 includes a pressure reducing part 201a, a nozzle throat part 201b, and a divergent part 201c. In FIG. 2, alphabets such as “d, e, f, g, h” represent points of the Mollier diagram described later.

The high-pressure refrigerant (driving refrigerant) that has flowed out of the bubble refining means 106 flows in from the refrigerant inlet 204, and expands under reduced pressure as the flow path area decreases in the pressure reducing portion 201a. The speed increases due to the decompression, and the sound speed is reached at the nozzle throat 201b. The driving refrigerant that has reached the speed of sound is depressurized while further increasing its speed at the divergent portion 201c. As a result, the gas-liquid two-phase refrigerant flows out of the nozzle unit 201 at an ultra high speed.

On the other hand, the refrigerant sucked from the refrigerant suction port 205 of the ejector 107 is drawn into the super-high-speed refrigerant (suction refrigerant) due to a pressure difference (ΔPsuc) between the refrigerant suction port 205 and the outlet of the nozzle unit 201. The ultra-high speed driving refrigerant and the low-speed suction refrigerant begin to mix from the outlet of the nozzle unit 201, that is, the inlet of the mixing unit 202 (mixed refrigerant). In the mixed refrigerant, the pressure is recovered (increased) by exchanging momentum between the driving refrigerant and the suction refrigerant. Furthermore, also in the diffuser part 203, the dynamic pressure is converted into a static pressure by the deceleration due to the expansion of the flow path, and the pressure increases (ΔP). The mixed refrigerant flows out from the diffuser portion 203 (refrigerant outlet 206).

(First evaporator 104, second evaporator 108)
FIG. 3 is a diagram showing an outline of the configuration of the first evaporator 104 and the second evaporator 108 of the refrigeration cycle apparatus in the first embodiment.
FIG. 3A shows a side view, and FIG. 3B shows a front view (viewed from the stacking direction).
The 1st evaporator 104 and the 2nd evaporator 108 are comprised by the plate-type heat exchanger, for example. The first evaporator 104 and the second evaporator 108 exchange heat between the refrigerant and the heat medium (for example, water).
As shown in FIG. 3A, in the plate heat exchanger, the heat transfer plates 302 and the heat transfer plates 303 are alternately stacked. The plate-type heat exchanger has a reinforcing side plate 301 stacked on the foremost surface and a reinforcing side plate 304 stacked on the backmost surface.

As shown in FIG. 3B, the reinforcing side plate 301 is formed in a substantially rectangular plate shape. The reinforcing side plate 301 is provided with a first inflow pipe 305, a first outflow pipe 306, a second inflow pipe 307, and a second outflow pipe 308 at four corners of a substantially rectangular shape.
Each of the

heat transfer plates

302 and 303 is formed in a substantially rectangular plate shape, like the reinforcing side plate 301, and a first inlet, a first outlet, a second inlet, and a second outlet are provided at four corners. It is done.
The reinforcing side plate 304 is formed in a substantially rectangular plate shape like the reinforcing side plate 301 and the like. The reinforcing side plate 304 is not provided with the first inflow pipe 305, the first outflow pipe 306, the second inflow pipe 307, and the second outflow pipe 308.

Accordingly, the first flow path through which the heat medium (for example, water) flowing in from the first inflow pipe 305 flows out from the first outflow pipe 306 is between the back surface of the heat transfer plate 303 and the front surface of the heat transfer plate 302. Formed.
Similarly, a second flow path for allowing the refrigerant flowing in from the second inflow pipe 307 to flow out from the second outflow pipe 308 is formed between the back surface of the heat transfer plate 302 and the front surface of the heat transfer plate 303.
Between the heat transfer plate 302 and the heat transfer plate 303, a flow path through which the heat medium flows and a flow path through which the refrigerant flows are alternately formed. And the flow direction of a heat medium and the flow direction of a refrigerant | coolant oppose (counter flow).

The first evaporator 104 and the second evaporator 108 are not limited to plate-type heat exchangers that exchange heat between the refrigerant and the heat medium. For example, a fin and tube heat exchanger that exchanges heat between refrigerant and air may be used. In this case, air flows from the second evaporator 108 toward the first evaporator 104. Also, the indoor heat exchanger 111 and the water feeder 109 are omitted, and at least one of the first evaporator 104 and the second evaporator 108 is disposed in the indoor unit 110 to exchange heat with indoor air that becomes a heat load. May be.

(Condenser 102)
FIG. 4 is a diagram showing an outline of the configuration of the condenser 102 of the refrigeration cycle apparatus in the first embodiment.
As shown in FIG. 4, the condenser 102 is disposed in a blower chamber 415 provided in the outdoor unit 100. The condenser 102 is a fin-and-tube heat exchanger that exchanges heat between refrigerant and air.
A blower 406 and a condenser 102 adjacent to the blower 406 are incorporated in the blower chamber 415. The blower chamber 415 has a large space for securing an air passage. The blower 406 is a combination of three blade-type propellers and a motor that rotationally drives the propellers, and the motor and the propellers are rotated at a predetermined number of revolutions by electric power supplied from the outside. .
In the condenser 102, for example, a long refrigerant pipe in which a large number of aluminum thin fins are closely attached is bent into an approximately L-shaped plate shape, and heat exchange is performed between the refrigerant in the refrigerant pipe and the air around the fins. The condenser 102 adjusts the amount of heat exchange by adjusting the air volume of the air that flows between the fins by the blower 406.

The condenser 102 is not limited to a fin-and-tube heat exchanger that exchanges heat between refrigerant and air. For example, a plate-type heat exchanger that exchanges heat between a refrigerant and a heat medium (for example, water) may be used.

(Indoor unit 110)
An indoor heat exchanger 111 is provided in the indoor unit 110.
The indoor heat exchanger 111 is constituted by, for example, a fin-and-tube heat exchanger that exchanges heat between a heat medium and air. The indoor heat exchanger 111, the second evaporator 108, the first evaporator 104, and the water feeder 109 are sequentially connected to form a flow path through which the heat medium circulates.

Note that the indoor heat exchanger 111 is not limited to a fin-and-tube heat exchanger. For example, a plate-type heat exchanger that exchanges heat between the heat medium circulating through the second evaporator 108 and the first evaporator 104 and a heat medium (for example, water) serving as a heat load may be used.

(Refrigeration cycle operation)
Next, the operation of the refrigeration cycle apparatus will be described.
FIG. 5 is a Mollier diagram showing the operating state of the refrigeration cycle apparatus in the first embodiment.
The horizontal axis of the Mollier diagram in FIG. 5 indicates the specific enthalpy of the refrigerant, and the vertical axis indicates the pressure. Further, points a to i in the Mollier diagram indicate refrigerant states at the positions shown in FIGS.

The high-temperature and high-pressure gas refrigerant (state a) discharged from the compressor 101 flows into the condenser 102. The gas refrigerant that has flowed into the condenser 102 is condensed by heat exchange with the air by the condenser 102 and becomes a high-temperature and high-pressure liquid refrigerant (state b). The liquid refrigerant that has flowed out of the condenser 102 is divided into a liquid refrigerant that flows to the first expansion valve 103 and a liquid refrigerant that flows to the second expansion valve 105.

The liquid refrigerant (state b) that is diverted from the outlet of the condenser 102 and flows into the first expansion valve 103 is expanded in an equal enthalpy state by the first expansion valve 103 to become a gas-liquid two-phase refrigerant (state c). It flows into the evaporator 104. The refrigerant that has flowed into the first evaporator 104 is heated by heat exchange with the heat medium by the first evaporator 104 to become a gas refrigerant (state d). The gas refrigerant (state d) flowing out from the first evaporator 104 is sucked into the refrigerant suction port 205 of the ejector 107.

On the other hand, the liquid refrigerant (state b) which is diverted from the outlet of the condenser 102 and flows into the second expansion valve 105 is expanded in an equal enthalpy state by the second expansion valve 105 to become a gas-liquid two-phase refrigerant (state e) It flows into the bubble miniaturization means 106. That is, the dryness of the refrigerant flowing into the bubble refining means 106 is greater than zero. For example, the dryness of the refrigerant flowing into the bubble refining means 106 is larger than 0 and smaller than 0.1.

Here, the opening degree of the second expansion valve 105 may be controlled such that the dryness of the refrigerant flowing into the bubble refining means 106 is greater than zero.
For example, temperature sensors that measure the temperature of the refrigerant are attached to the inlet side and the outlet side of the second expansion valve 105. Then, the opening degree of the second expansion valve 105 is adjusted so that the refrigerant temperature on the outlet side is lower than the refrigerant temperature on the inlet side. Thereby, the dryness of the refrigerant flowing into the bubble refining means 106 can be made larger than zero.
In addition, this invention is not limited to the structure which controls the opening degree of the 2nd expansion valve 105. FIG. The present invention only needs to be configured so that a gas-liquid two-phase refrigerant flows into the bubble refining means 106. For example, the opening degree of the second expansion valve 105 may be fixed.

The bubble refinement means 106 refines the bubbles contained in the gas-liquid two-phase refrigerant flowing from the second expansion valve 105. As a result, the liquid refrigerant and the gas refrigerant contained in the gas-liquid two-phase refrigerant are uniformly mixed. The gas-liquid two-phase refrigerant (state e) flowing out from the bubble refining means 106 flows into the refrigerant inlet 204 of the ejector 107.

The gas-liquid two-phase refrigerant (state e) that has flowed into the refrigerant inlet 204 of the ejector 107 is adiabatically expanded (isentropic expansion) by the nozzle portion 201 of the ejector 107 and becomes a gas-liquid two-phase refrigerant at an ultra-high speed. (State f). The super-high-speed gas-liquid two-phase refrigerant sucks the refrigerant vaporized in the first evaporator 104 (state d), and the mixing unit 202 uses the super-high-speed refrigerant (state f) and the low-speed refrigerant (state d). Are mixed to form a mixed refrigerant (state g). The mixed refrigerant increases in pressure at the diffuser section 203 (state h) and flows out from the refrigerant outlet 206 of the ejector 107.

The refrigerant (state h) that has flowed out of the refrigerant outlet 206 of the ejector 107 flows into the second evaporator 108. The gas refrigerant flowing into the second evaporator 108 is heated by heat exchange with the heat medium by the second evaporator 108 to become a gas refrigerant (state i). This gas refrigerant is sucked into the compressor 101.

As described above, in the first embodiment, the second expansion valve 105 and the second expansion valve 105 flow out between the condenser 102 and the refrigerant inlet 204 of the ejector 107 in the second refrigerant flow path. The bubble refining means 106 for refining bubbles contained in the refrigerant was sequentially connected.
For this reason, the bubble contained in the refrigerant | coolant which flows into the refrigerant | coolant inflow port 204 of the ejector 107 is refined | miniaturized, suppressing the fall of the refrigerating capacity in the 1st evaporator 104 and the 2nd evaporator 108, and reducing a freezing effect. can do. As a result, the power recovery rate (efficiency) of the ejector 107 that converts pressure energy into velocity energy can be improved, and the refrigeration capacity and energy efficiency (COP: Coefficient Of Performance) of the refrigeration cycle apparatus can be improved. .

Here, the power recovery rate (efficiency η) of the ejector 107 can be expressed by the following equation.

V is the refrigerant velocity at the refrigerant outlet 206 of the ejector 107.
G is the refrigerant circulation amount.
Δh is a difference (adiabatic heat drop) between the specific enthalpy of the refrigerant (state e) at the refrigerant inlet 204 of the ejector 107 and the specific enthalpy of the refrigerant (state f) after adiabatic expansion at the nozzle portion 201.

From the relationship of the above formula, the power recovery rate (efficiency η) of the ejector 107 is improved by increasing the refrigerant speed V.
In Embodiment 1, since bubbles contained in the refrigerant flowing into the refrigerant inlet 204 of the ejector 107 are miniaturized, the contact area between the liquid refrigerant and the gas refrigerant increases in the ejector 107, and the pressure of the liquid refrigerant is reduced. Boiling is promoted. As a result, the speed of the refrigerant flowing out from the ejector 107 increases. That is, the power recovery rate that converts pressure energy into velocity energy increases. Therefore, the energy efficiency of the refrigeration cycle apparatus can be improved.

Embodiment 2. FIG.
In the second embodiment, an example of the configuration of the bubble miniaturization means 106 will be described.

FIG. 6 is a diagram schematically showing the configuration of the bubble refining means 106 of the refrigeration cycle apparatus in the second embodiment.
FIG. 6A shows a case where the refrigerant flow direction of the refrigerant pipe is a horizontal direction, and FIG. 6B shows a case where the refrigerant flow direction of the refrigerant pipe is a vertical direction.
As shown in FIGS. 6 (a) and 6 (b), the bubble refining means 106 in the second embodiment is constituted by a porous body 601 through which a refrigerant passes.
The porous body 601 is provided in the flow path in the refrigerant pipe. For example, the porous body 601 is entirely formed of a porous permeable material, the average diameter of the air holes (the surface of the porous body through which fluid can permeate and the internal pores) is about 500 μm, and the porosity is 92 ± 6%. is there. The porous body 601 is formed, for example, by applying metal powder to urethane foam, then heat-treating the urethane foam to burn it, and forming the metal into a three-dimensional lattice shape. The material of the porous body 601 is, for example, Ni (nickel).

Since the refrigerant in the gas-liquid two-phase state before passing through the porous body 601, that is, the refrigerant flowing out from the second expansion valve 105 has a low dryness, bubbles of bubbles (bubble slags 602 and 603) are contained in the liquid refrigerant. It becomes the aspect that included. When the bubble slugs 602 and 603 pass through the porous body 601, they are refined in the porous body 601 and flow out as fine bubbles 604.

For this reason, the gas-liquid two-phase refrigerant in which the fine bubbles and the liquid refrigerant are homogenized can flow into the refrigerant inlet 204 of the ejector 107.
Therefore, the contact area between the liquid refrigerant and the gas refrigerant is increased in the ejector 107, and the reduced-pressure boiling of the liquid refrigerant is promoted. As a result, the speed of the refrigerant flowing out from the ejector 107 increases. That is, the power recovery rate that converts pressure energy into velocity energy increases. Therefore, the energy efficiency of the refrigeration cycle apparatus can be improved.

Embodiment 3 FIG.
In the third embodiment, an example of the configuration of the bubble miniaturization means 106 will be described.

FIG. 7 is a diagram schematically showing the configuration of the bubble refining means 106 of the refrigeration cycle apparatus in the third embodiment.
Fig.7 (a) shows sectional drawing of the direction orthogonal to a turning axis, FIG.7 (b) shows sectional drawing of a turning axis direction.
As shown in FIGS. 7A and 7B, the bubble refining means 106 includes an introduction pipe 701,

branch pipes

702a and 702b,

swirl chambers

703a and 703b, and an outflow pipe 704. I have.
The bubble miniaturization means 106 in the third embodiment is configured by a two-stage swirling mechanism that turns the refrigerant flowing in from the introduction pipe 701 into a swirling flow and outflows from the outflow pipe 704.

The

swirl chambers

703 a and 703 b have a shape in which the refrigerant passage area decreases toward the outflow pipe 704. For example, the

swirl chambers

703a and 703b have a conical shape.
The

swirl chambers

703a and 703b are provided adjacent to each other, and the refrigerant that has flowed out of the swirl chamber 703a flows into the adjacent swirl chamber 703b. The number of swirl chambers is not limited to two.

Note that the connecting portion between the swirl chamber 703a and the branch pipe 702a corresponds to the “inlet” of the present invention. The connecting portion between the swirl chamber 703b and the branch pipe 702b corresponds to the “inlet” of the present invention. The opening through which the refrigerant flows from the swirl chamber 703a to the swirl chamber 703b corresponds to the “outlet” of the present invention. The connecting portion between the swirl chamber 703b and the outflow pipe 704 corresponds to the “outlet” of the present invention.

The gas-liquid two-phase refrigerant that has flowed out of the second expansion valve 105 passes through the introduction pipe 701, is branched into the branch pipe 702a and the branch pipe 702b, and flows into the swirl chamber 703a and the swirl chamber 703b, respectively.
As shown in FIG. 7A, the

branch pipes

702a and 702b are connected to the

swirl chambers

703a and 703b having a conical shape toward the tangential direction of the circular cross section. Thereby, the refrigerant that has flowed into the

swirl chambers

703a and 703b flows along the inner wall surfaces of the

swirl chambers

703a and 703b to form a swirl flow.

The gas-liquid two-phase refrigerant that has flowed into the swirl chamber 703a from the branch pipe 702a becomes a swirl flow. Separated into the center.
Further, since the flow passage cross-sectional area (refrigerant passage area) of the swirl chamber 703a decreases toward the outflow pipe 704, the swirl chamber 703a flows into the swirl chamber 703b while increasing the flow velocity.

On the other hand, the gas-liquid two-phase refrigerant flowing into the swirl chamber 703b from the branch pipe 702b becomes a swirl flow while mixing with the swirl flow flowing out of the swirl chamber 703a. In the swirl chamber 703b, the swirl flow formed in the swirl chamber 703a promotes the formation of the swirl flow.
The refrigerant in the gas-liquid two-phase state in the swirl chamber 703b becomes a swirl flow, so that the liquid refrigerant having a high density is separated to the outside of the swirl chamber 703b by centrifugal force, and the gas refrigerant having a low density is separated to the center by centripetal force. The
Furthermore, since the flow passage cross-sectional area (refrigerant passage area) of the swirl chamber 703b decreases toward the outflow pipe 704, the outflow pipe 704 flows out while increasing the flow velocity.

The gas-liquid two-phase refrigerant that has flowed out of the swirl chamber 703b into the outflow pipe 704 starts to weaken the swirl component after the outflow starts. As a result, a difference in swirl speed occurs along the flow direction of the outflow pipe 704.
This speed difference generates a shearing force between the liquid refrigerant and the gas refrigerant, and the gas refrigerant is divided, so that the bubbles are refined.

A flow rate adjusting means for adjusting the flow rate is attached to at least one of the branch pipe 702a and the branch pipe 702b, and the amount of refrigerant flowing into the swirl chamber 703a and the swirl chamber 703b is adjusted to an inflow amount suitable for bubble miniaturization. You may do it.
Further, the shapes of the swirl chamber 703a and the swirl chamber 703b are not limited to a conical shape. Any shape that reduces the cross-sectional area along the exit direction of the

swirl chambers

703a and 703b may be used. For example, a U-shaped cross section may be used.

Embodiment 4 FIG.
In the fourth embodiment, an example of the configuration of the bubble miniaturization means 106 will be described.

FIG. 8 is a diagram schematically showing the configuration of the bubble refining means 106 of the refrigeration cycle apparatus in the fourth embodiment.
As shown in FIG. 8, the bubble refining means 106 in the fourth embodiment includes a gas-liquid separator 802 that separates the refrigerant into a gas phase (gas refrigerant) and a liquid phase (liquid refrigerant), and a gas-liquid separator. And a mixer 805 for mixing the liquid-phase refrigerant and the gas-phase refrigerant separated by 802.

The gas-liquid separator 802 is, for example, a gravity drop type gas-liquid separator that separates liquid refrigerant and gas refrigerant by the action of gravity. The gas-liquid separator 802 includes an inflow pipe 801, a gas refrigerant outlet 803, and a liquid refrigerant outlet 804.
The inflow pipe 801 allows the refrigerant to flow from above the tank that forms the outer shell.
The liquid refrigerant outlet 804 allows the liquid refrigerant to flow out from below the tank.
In the gas refrigerant outlet 803, the end of the pipe is inserted above the liquid refrigerant outlet 804, and the gas refrigerant in the tank flows out. For example, a plurality of gas refrigerant outlets 803 are attached to the outer peripheral side of the liquid refrigerant outlet 804.

The gas-liquid two-phase refrigerant flowing out from the second expansion valve 105 flows into the gas-liquid separator 802 through the inflow pipe 801. Inside the gas-liquid separator 802, the liquid refrigerant having a high density is separated downward, and the gas refrigerant having a low density is separated upward.
The gas refrigerant flowing out from the gas refrigerant outlet 803 and the liquid refrigerant flowing out from the liquid refrigerant outlet 804 flow into the mixer 805, respectively.

FIG. 9 is a diagram schematically showing the configuration of the mixer 805 of the refrigeration cycle apparatus in the fourth embodiment.
As shown in FIG. 9, the mixer 805 converts the liquid-phase refrigerant flow channel 901 through which the liquid-phase refrigerant from the liquid refrigerant outlet 804 flows and the gas-phase refrigerant from the gas refrigerant outlet 803 into the liquid-phase refrigerant. A gas-phase refrigerant channel 902 that is ejected into the channel 901. The mixer 805 mixes the liquid-phase refrigerant and the gas-phase refrigerant and causes the refrigerant to flow out to the outflow pipe 806.

In the mixer 805, a speed difference is generated at the interface between the gas refrigerant flowing from the gas refrigerant outlet 803 into the gas-phase refrigerant channel 902 and the liquid refrigerant flowing into the liquid-phase refrigerant channel 901 from the liquid refrigerant outlet 804. . This speed difference generates a shearing force between the liquid refrigerant and the gas refrigerant, and the gas refrigerant is divided, so that the bubbles are refined.

The speed of the gas refrigerant flowing out from the gas refrigerant outlet 803 and the speed of the liquid refrigerant flowing out from the liquid refrigerant outlet 804 are determined by the cross-sectional area of the outlet pipe 806 and the mass flow rates of the gas refrigerant and liquid refrigerant. Is done.
When the degree of dryness is relatively small, the ratio of the liquid refrigerant is larger than that of the gas refrigerant. Therefore, the liquid refrigerant can be obtained by reducing the channel area of the liquid refrigerant outlet 804 and reducing the cross-sectional area of the gas refrigerant outlet 803. And the speed difference between the gas refrigerant becomes larger. Here, the channel cross-sectional area is the total channel cross-sectional area of each phase.

With the above-described configuration, the gas-liquid two-phase refrigerant obtained by homogenizing the fine bubbles and the liquid refrigerant can flow into the refrigerant inlet 204 of the ejector 107.
Therefore, the contact area between the liquid refrigerant and the gas refrigerant is increased in the ejector 107, and the reduced-pressure boiling of the liquid refrigerant is promoted. As a result, the speed of the refrigerant flowing out from the ejector 107 increases. That is, the power recovery rate that converts pressure energy into velocity energy increases. Therefore, the energy efficiency of the refrigeration cycle apparatus can be improved.

8 and 9, the case where a plurality of gas refrigerant outlets 803 are attached to the outer peripheral side of the liquid refrigerant outlet 804 has been described, but the present invention is not limited to this. For example, the gas refrigerant outlet 803 may be provided at the center, and the liquid refrigerant outlet 804 may be attached to the outer peripheral side.

100 outdoor unit, 101 compressor, 102 condenser, 103 first expansion valve, 104 first evaporator, 105 second expansion valve, 106 bubble refining means, 107 ejector, 108 second evaporator, 109 water feeder, 110 Indoor unit, 111 indoor heat exchanger, 201 nozzle section, 201a pressure reducing section, 201b nozzle throat section, 201c nozzle wide section, 202 mixing section, 203 diffuser section, 204 refrigerant inlet, 205 refrigerant inlet, 206 refrigerant outlet, 301 Reinforcing side plate, 302 heat transfer plate, 303 heat transfer plate, 304 reinforcing side plate, 305 first inflow pipe, 306 first outflow pipe, 307 second inflow pipe, 308 second outflow pipe, 406 blower, 415 blower Chamber, 601 porous body, 602 bubbles Lag, 603 bubble slag, 604 fine bubble, 701 introduction tube, 702a branch tube, 702b branch tube, 703a swirl chamber, 703b swirl chamber, 704 outflow tube, 801 inflow tube, 802 gas-liquid separator, 803 gas refrigerant outlet, 804 liquid refrigerant outlet, 805 mixer, 806 outflow pipe, 901 liquid phase refrigerant flow path, 902 gas phase refrigerant flow path.

Claims

A first refrigerant flow path in which a refrigerant suction port of a compressor, a condenser, a first expansion valve, a first evaporator, and an ejector is connected by a refrigerant pipe;
A second refrigerant branching between the condenser and the first expansion valve, wherein a refrigerant inlet of the ejector, a refrigerant outlet of the ejector, a second evaporator, and the compressor are connected by a refrigerant pipe A flow path;
With
In the second refrigerant flow path, between the condenser and the refrigerant inlet of the ejector,
A refrigeration cycle apparatus, wherein a second expansion valve and bubble refining means for refining bubbles included in the refrigerant flowing out of the second expansion valve are sequentially connected.
The refrigeration cycle apparatus according to claim 1, wherein the dryness of the refrigerant flowing into the bubble refining means is greater than zero.
3. The refrigeration cycle apparatus according to claim 1, wherein an opening degree of the second expansion valve is controlled so that a dryness of the refrigerant flowing into the bubble refining unit is greater than zero.
The bubble refinement means includes
A gas-liquid separator that separates the refrigerant into a gas phase and a liquid phase;
A mixer for mixing the liquid-phase refrigerant and the gas-phase refrigerant separated by the gas-liquid separator;
The refrigeration cycle apparatus according to any one of claims 1 to 3, wherein the refrigeration cycle apparatus is configured by.
The mixer is
A liquid-phase refrigerant flow path through which the liquid-phase refrigerant flows;
A gas-phase refrigerant flow path for ejecting the gas-phase refrigerant into the liquid-phase refrigerant flow path;
The refrigeration cycle apparatus according to claim 4, further comprising:
The bubble refinement means includes
An inflow port and an outflow port are formed, and is constituted by a swirl chamber in which a refrigerant passage area decreases toward the outflow port,
The refrigeration cycle apparatus according to any one of claims 1 to 3, wherein the refrigerant that has flowed from the inflow port is turned into a swirl flow and then flows out from the outflow port.
A plurality of swirl chambers are provided adjacent to each other;
The refrigeration cycle apparatus according to claim 6, wherein the refrigerant that has flowed out of the outlet of the swirl chamber flows into the adjacent swirl chamber.
The refrigeration cycle apparatus according to any one of claims 1 to 3, wherein the bubble refining means is constituted by a porous body through which the refrigerant passes.