WO2019054072A1

WO2019054072A1 - Liquid recovery apparatus

Info

Publication number: WO2019054072A1
Application number: PCT/JP2018/028878
Authority: WO
Inventors: 和寿西中村; 小原　公和; 祐一坂上; 佐藤　博道
Original assignee: 株式会社デンソー; トヨタ自動車株式会社
Priority date: 2017-09-15
Filing date: 2018-08-01
Publication date: 2019-03-21
Also published as: JP2019051478A

Abstract

This liquid recovery apparatus is provided with an outer tube (20), an inner tube (30), a double-tube portion (35), a liquid phase recovery portion (40), and a liquid discharge tube (45). The outer tube has an introduction portion (21) through which a gas-liquid two-phase fluid is introduced. The inner tube is disposed, at a position extended from the introduction portion to the downstream side with respect to the flow direction of the gas-liquid two-phase fluid in the introduction portion, inside the outer tube, and discharges a gas-phase fluid separated from the gas-liquid two-phase fluid. The double-tube portion is formed on the downstream side of the flow direction in the outer tube, by disposing the inner tube inside the outer tube with a predetermined space provided relative to the inner side of the outer tube. The liquid phase recovery portion is formed on the downstream side of the flow direction in the double-tube portion, so as to have a flow path cross-sectional area larger than the flow path cross-sectional area of the double-tube portion on the upstream side of the flow direction, and recovers a liquid-phase fluid separated from the gas-liquid two-phase fluid. The liquid discharge tube is connected to the lower part of the liquid phase recovery portion, and discharges the liquid-phase fluid recovered by the liquid phase recovery portion.

Description

Liquid recovery device

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2017-177362 filed on Sep. 15, 2017, the disclosure of which is incorporated by reference into the present application.

The present disclosure relates to a liquid recovery apparatus that separates and recovers a liquid-phase fluid from a gas-liquid two-phase fluid.

Conventionally, in a system using fluids such as steam, compressed air, and various gases, a liquid recovery device is disposed. The liquid recovery apparatus is configured to separate a gas-liquid two-phase fluid into a gas phase and a liquid phase, and recovers the separated liquid-phase fluid for use in various applications.

As a disclosure related to such a liquid recovery apparatus, the disclosure described in Patent Document 1 is known. The gas-liquid separator described in Patent Document 1 has a double structure of a tubular member by arranging a cylindrical liquid collecting member along the inner peripheral wall surface of the separator casing through which the gas-liquid two-phase fluid flows. It is configured to be

In the gas-liquid separator, the gas-liquid two-phase fluid is separated into the gas phase fluid and the liquid phase fluid when flowing into the gap between the inner peripheral wall surface of the separator casing and the surface of the liquid collecting member. The separated liquid phase fluid flows along the inner circumferential wall surface of the separator casing. Further, since the liquid outlet is provided in the gap between the separator casing and the liquid collecting member, the separated liquid phase fluid is recovered via the liquid outlet.

JP, 2005-147482, A

Here, in the system using the liquid recovery device, the state of the gas-liquid two-phase fluid flowing into the liquid recovery device is not always the predetermined state. For example, when applied to a fuel cell system, the exhaust state of the fuel cell as a gas-liquid two-phase fluid changes in various ways due to load fluctuation and the like. For this reason, as a liquid recovery apparatus, it is necessary to maintain a high recovery rate of the liquid phase fluid under a wide range of conditions.

In the liquid recovery apparatus such as the gas-liquid separator of Patent Document 1, when the flow rate of the gas-liquid two-phase fluid is large, the vortex flow by the gas phase fluid is generated in the gap portion and the flow of the fluid is obstructed . As a result, in the liquid recovery apparatus, the flow of the liquid phase fluid passing through the gap portion is obstructed, and the recovery rate of the liquid phase fluid is lowered.

In addition, when the flow rate of the liquid phase fluid temporarily increases, it is assumed that the water level of the liquid phase fluid exceeds the gap portion and is higher than the lower portion of the liquid collecting member. In this case, part of the liquid phase fluid flows out through the inside of the liquid collecting member, and as a result, the recovery rate of the liquid phase fluid is lowered.

The present disclosure is made in view of these points, and an object of the present disclosure is to provide a liquid recovery apparatus capable of achieving a high recovery rate of liquid phase fluid under a wide range of conditions of gas-liquid two-phase fluid.

A liquid recovery apparatus according to an aspect of the present disclosure includes an outer pipe, an inner pipe, a double pipe section, a liquid phase recovery section, and a drainage pipe. The outer pipe has an introduction part into which a gas-liquid two-phase fluid is introduced. The inner pipe is disposed inside the outer pipe at a position where the introducing portion extends downstream with respect to the flow direction of the gas-liquid two-phase fluid at the introducing portion, and the gas phase fluid separated from the gas-liquid two-phase fluid is discharged Do. The double pipe portion is configured by arranging the inner pipe at a predetermined distance with respect to the inner side of the outer pipe on the downstream side in the flow direction of the outer pipe. The liquid phase recovery unit is configured to have a flow passage cross-sectional area larger than the flow passage cross-sectional area on the flow direction upstream side of the double pipe portion on the flow direction downstream side of the double pipe portion. The liquid phase fluid separated from is recovered. The drain pipe is connected to the lower portion of the liquid phase recovery unit, and drains the liquid phase fluid recovered in the liquid phase recovery unit.

According to the liquid recovery apparatus, the gas-liquid two-phase fluid introduced from the introduction part of the outer pipe is separated from the liquid phase fluid by passing through the double pipe formed of the outer pipe and the inner pipe. While being collected in the liquid phase recovery unit, the separated gas phase fluid can be discharged from the exhaust pipe. And the said liquid collection | recovery apparatus can drain the liquid phase fluid collect | recovered inside the liquid phase collection | recovery part outside via a drain pipe.

Here, in the liquid recovery apparatus, the flow channel cross-sectional area of the liquid phase recovery unit is formed larger than the flow channel cross-sectional area on the upstream side in the flow direction of the double pipe portion, and the liquid phase recovery unit It is disposed downstream of the pipe in the flow direction.

For this reason, in the liquid recovery apparatus, the fluid flow is introduced into the double pipe section, and then generates a vortex in the liquid phase recovery section. That is, since the liquid recovery device generates a vortex flow downstream of the portion where the fluid flows into the double pipe portion, the movement of the liquid phase fluid along the inner surface of the outer pipe is performed in the double pipe portion. It is not disturbed by the vortex when it flows in.

Thus, according to the liquid recovery apparatus, the liquid phase fluid moving along the inner surface of the outer tube can smoothly flow into the liquid phase recovery unit, and high recovery is possible under a wide range of conditions of the gas-liquid two-phase fluid. Liquid phase fluid can be recovered at a rate.

In addition, since the flow channel cross-sectional area of the liquid phase recovery unit is formed larger than the flow channel cross-sectional area on the upstream side in the flow direction of the double pipe portion, a large amount of liquid phase fluid is stored inside the liquid phase recovery unit. can do.

That is, the liquid recovery apparatus can suppress the outflow of the liquid phase fluid through the inner pipe even when the flow rate of the liquid phase fluid flowing into the liquid phase recovery unit is increased. That is, the liquid recovery apparatus can cope with a wide range of conditions regarding the amount of liquid phase fluid contained in the gas-liquid two-phase fluid, and can recover the liquid phase fluid with a high recovery rate.

The above object and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the attached drawings.

FIG. 1 is a block diagram of a fuel cell system including a liquid recovery apparatus according to a first embodiment. FIG. 1 is an external perspective view of a liquid recovery apparatus according to a first embodiment. It is sectional drawing which shows the internal structure of the liquid collection | recovery apparatus which concerns on 1st Embodiment. It is explanatory drawing which shows the flow of the gas-liquid two-phase fluid in the conventional gas-liquid separator. It is explanatory drawing which shows the flow of the gas-liquid two-phase fluid in the liquid collection | recovery apparatus which concerns on 1st Embodiment. It is sectional drawing which shows the internal structure of the liquid collection | recovery apparatus which concerns on 2nd Embodiment. It is sectional drawing which shows the internal structure of the liquid collection | recovery apparatus which concerns on 3rd Embodiment. It is sectional drawing which shows the internal structure of the liquid collection | recovery apparatus which concerns on 4th Embodiment.

Hereinafter, embodiments will be described based on the drawings. In the following embodiments, parts which are the same as or equivalent to each other are given the same reference numerals in the drawings.

First Embodiment
The liquid recovery apparatus 10 according to the first embodiment is mounted on an electric car (fuel cell vehicle) traveling with the fuel cell 1 as a power source, and constitutes a part of the fuel cell system 100. The fuel cell system 100 is configured to supply the electric power generated by the fuel cell 1 to an electric device (not shown) such as a traveling electric motor or a battery.

First, the configuration of the fuel cell system 100 according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the fuel cell system 100 according to the first embodiment includes a fuel cell 1 (FC stack) that generates electric power by using a chemical reaction of hydrogen and oxygen.

The fuel cell 1 is a solid polymer electrolyte fuel cell (PEFC), and is configured by combining a large number of cells. Each cell is formed by sandwiching an electrolyte membrane between a pair of electrodes.

The fuel cell 1 is supplied with air containing oxygen through the air passage 2. An air pump 6 is disposed in the air passage 2, and air is pumped by the operation of the air pump 6 and supplied to the fuel cell 1. Further, hydrogen is supplied to the fuel cell 1 via the hydrogen passage 3.

Then, in the fuel cell 1, the following electrochemical reaction of hydrogen and oxygen occurs to generate electric energy. Unreacted oxygen and hydrogen which are not used for the electrochemical reaction are discharged from the fuel cell 1 as exhaust gas and hydrogen. The unreacted exhaust hydrogen is returned to the hydrogen passage 3 again with the operation of the hydrogen pump 9 and supplied to the fuel cell 1.
(Negative _{^{electrode) H 2 → 2H + + 2e}} -
(Positive ^{_{side) 2H + + 1 / 2O 2}} + 2e - → H 2 O
For the electrochemical reaction, the electrolyte membrane in the fuel cell 1 needs to be in a wet state containing water. The fuel cell system 100 humidifies the electrolyte membrane in the fuel cell 1 by humidifying the air and hydrogen supplied to the fuel cell 1 and supplying the humidified gas to the fuel cell 1. Is configured.

Further, in the fuel cell 1, heat and moisture are generated by the electrochemical reaction at the time of power generation. In consideration of the power generation efficiency of the fuel cell 1, the fuel cell 1 needs to be maintained at a constant temperature (for example, about 80 ° C.) while the fuel cell system 100 is operating. In addition, when the electrolyte membrane inside the fuel cell 1 exceeds the predetermined allowable upper limit temperature, the electrolyte membrane is broken due to the high temperature. Therefore, it is necessary to keep the temperature of the fuel cell 1 below the allowable temperature.

As shown in FIG. 1, a cooling water circuit is disposed in the fuel cell system 100, and the temperature of the fuel cell 1 is controlled by cooling the fuel cell 1 using the cooling water as a heat medium. ing. As cooling water which is a heat medium, for example, a mixed solution of ethylene glycol and water can be used to prevent freezing at low temperature.

The cooling water circuit is configured to include the radiator 4, the fan 5, the cooling water flow path 7, and the water pump 8, and by circulating the cooling water between the fuel cell 1 and the radiator 4, The heat generated in the fuel cell 1 is configured to be released out of the system.

The radiator 4 is a heat exchanger configured to dissipate the heat generated by the fuel cell 1 to the outside of the system. In the fuel cell system 100, the cooling water of the cooling water circuit absorbs heat generated by the electrochemical reaction in the process of flowing through the fuel cell 1 and flows out, and flows into the radiator 4 through the cooling water flow path 7. Do.

In the radiator 4, heat exchange between the cooling water and the atmosphere is performed, and the heat of the cooling water is dissipated to the atmosphere. Thereafter, the cooling water flows from the radiator 4 toward the fuel cell 1 and circulates through the cooling water flow path 7 of the cooling water circuit. That is, the radiator 4 dissipates heat generated by the electrochemical reaction of the fuel cell 1 by heat exchange with cooling water as a heat medium, thereby cooling the fuel cell 1.

Further, the radiator 4 has a fan 5. The fan 5 assists the heat exchange of the cooling water in the radiator 4 by blowing the outside air which is the heat exchange object in the radiator 4 to the radiator 4.

The water pump 8 is disposed in the cooling water flow path 7 as a circulation path including the fuel cell 1 and the radiator 4 and pumps the cooling water to circulate the cooling water inside the cooling water flow path 7.

In the fuel cell system 100, temperature control of the cooling water in the cooling water circuit is performed by flow control by the water pump 8 and air flow control of the fan 5. A coolant temperature sensor (not shown) is disposed on the outlet side of the fuel cell 1 in the coolant channel 7. The water temperature sensor detects the temperature of the cooling water flowing out from the outlet side of the fuel cell 1.

In the fuel cell system 100, the water generated at the time of power generation by the fuel cell 1 is discharged from the fuel cell 1 through the air passage 2 in a state contained in air (that is, a gas-liquid two-phase state). . Therefore, the liquid recovery device 10 is disposed downstream of the fuel cell 1 in the air passage 2. That is, the flow direction of the fluid from the fuel cell 1 to the liquid recovery device 10 corresponds to the flow direction of the gas-liquid two-phase fluid in the present disclosure.

The liquid recovery apparatus 10 takes in the moisture generated during the power generation in the fuel cell 1 together with the air discharged from the air passage 2 and separates it into water vapor and water. Then, the water vapor separated by the liquid recovery device 10 is discharged to the outside of the fuel cell system 100.

On the other hand, the water separated by the liquid recovery device 10 is recovered inside the liquid recovery device 10 in a state where the temperature is lowered by condensation, and is used for humidifying the fuel cell 1 or the like. That is, the liquid recovery device 10 functions as a liquid recovery device in the present disclosure. The specific configuration of the liquid recovery apparatus 10 will be described in detail later with reference to the drawings.

In the fuel cell system 100, the recovered water recovered inside the liquid recovery apparatus 10 can be used for various applications. In the fuel cell system 100, the recovered water is used to humidify the electrolyte membrane in the fuel cell 1 and to cool the radiator 4. At the lower part of the liquid recovery apparatus 10, a recovered water flow path 11 is connected. The recovered water flow path 11 is configured to use the recovered water stored inside the liquid recovery apparatus 10.

As shown in FIG. 1, the recovered water flow path 11 connects the lower portion of the liquid recovery device 10 and the flow rate adjustment valve 13, and in the recovered water flow path 11, the distribution pump 12 is disposed. It is done. Therefore, in the fuel cell system 100, the recovery water stored inside the liquid recovery apparatus 10 can be pressure-fed to the flow rate adjustment valve 13 by operating the distribution pump 12.

The radiator side flow passage 14 and the humidification flow passage 15 are connected to the flow rate adjustment valve 13. The radiator side flow passage 14 is a flow passage configured to disperse the recovered water pressure-fed from the inside of the liquid recovery device 10 via the flow rate adjustment valve 13 to the radiator 4 by the operation of the dispersion pump 12. A water spray nozzle configured to spray (spray) water in the form of a mist is disposed at a tip end portion of the radiator side flow passage 14.

In the fuel cell system 100, the flow rate adjustment valve 13 is configured to be able to independently adjust the valve opening degree with respect to the radiator side flow path 14 and the valve opening degree with respect to the humidification flow path 15, The dispersed flow rate of the recovered water at 14 and the dispersed flow rate of the recovered water in the humidification flow path 15 are adjusted.

The humidifying flow path 15 is a flow path configured to disperse the recovered water pressure-fed from the inside of the liquid recovery device 10 through the flow rate adjustment valve 13 to the fuel cell 1 by the operation of the distribution pump 12. It is. A water spray nozzle configured to spray (spray) water in the form of a mist is disposed at the tip end portion of the humidification flow path 15.

Specifically, the sprinkler nozzle in the humidification flow path 15 is disposed so as to disperse the recovered water on the downstream side of the air pump 6 in the air passage 2 and to supply the fuel cell 1 with the air in the air passage 2 There is.

The fuel cell system 100 according to the first embodiment has a control device (not shown). The control device is a control unit that controls the operation of each control target device that constitutes the fuel cell system 100. The control device is composed of a known microcomputer including a CPU, a ROM, a RAM and the like, and peripheral circuits thereof.

The fuel cell 1 and a water temperature sensor are connected to the input side of the control device. Therefore, the control device can acquire the output of the fuel cell 1 and the coolant temperature by the water temperature sensor.

Further, control target devices such as the hydrogen pump 9, the distribution pump 12, and the flow rate adjustment valve 13 are connected to the output side of the control device. Therefore, the operation of the fuel cell system 100 can be controlled based on the control program stored in the ROM of the control device.

Subsequently, a specific configuration of the liquid recovery apparatus 10 according to the first embodiment will be described in detail with reference to FIGS. 1, 2 and 3. The cross-sectional view shown in FIG. 3 shows a state of being cut at a longitudinal cross section including the central axis C of the outer pipe 20 in the liquid recovery apparatus 10.

Further, in the following description, the vertical direction shown in FIG. 2 and the like indicates the vertical direction in the state where the liquid recovery apparatus 10 is attached in the fuel cell system 100. And, the flow direction in the following description means the flow direction of the gas-liquid two-phase fluid when flowing into the liquid recovery apparatus 10, and conforms to the central axis C of the introducing unit 21 described later. .

As described above, on the downstream side of the fuel cell 1 in the air passage 2, the liquid recovery apparatus 10 generates water vapor (i.e., water-vapor two-phase fluid) containing water discharged from the fuel cell 1. It separates into gas phase fluid Fg) and water (ie, liquid phase fluid Fl), and recovers water as a liquid and exhausts water vapor.

As shown in FIGS. 2 and 3, the liquid recovery apparatus 10 includes an outer pipe 20 constituting an outer shell of the liquid recovery apparatus 10, an inner pipe 30 disposed inside the outer pipe 20, and two-phase gas-liquid An exhaust pipe 31 from which a gas phase fluid Fg (that is, water vapor) separated from the fluid is discharged, and a drainage pipe 45 from which a liquid phase fluid Fl (that is, water) separated from the gas-liquid two-phase fluid is mainly drained. And are configured.

The outer tube 20 constitutes an outer shell of the liquid recovery device 10, and has an introducing portion 21, an expanded tube portion 23, and a large diameter portion 24. The outer tube 20 functions as an outer tube in the present disclosure. The introduction portion 21 is a portion for introducing the gas-liquid two-phase fluid flowing out of the fuel cell 1 into the inside of the outer pipe 20, and constitutes the upstream side in the flow direction of the outer pipe 20. The introducing unit 21 functions as an introducing unit in the present disclosure.

As shown to FIG. 2, FIG. 3, the flow path of the cross-sectional circular shape is formed in the inside of the circular introduction part 21. As shown in FIG. In the following description, the central axis of the flow passage in the circular tubular introduction portion 21 is taken as a central axis C, and the central axis C is used as a reference. The flow passage cross section in the introduction part 21 has a circular shape centering on the central axis C and having a radius that is a predetermined introduction part inner diameter Ra.

An inlet 22 is disposed at one end of the introduction unit 21. The inlet 22 is connected to an air passage 2 extending downstream in the flow direction from the fuel cell 1. Therefore, a gas-liquid two-phase fluid containing water and water vapor discharged from the fuel cell 1 is introduced into the outer tube 20 through the air passage 2 and the inlet 22.

And the expanded pipe part 23 is arrange | positioned in the flow direction downstream of the gas-liquid two-phase fluid in the introducing | transducing part 21. As shown in FIG. The expanded tube portion 23 according to the first embodiment is formed in a tubular shape coaxially disposed with the central axis C of the introducing portion 21, and the flow passage cross-sectional area is continuously expanded toward the downstream side in the flow direction Is configured. The expanded portion 23 corresponds to the expanded portion in the present disclosure.

Specifically explaining, the flow passage cross section on the upstream side in the flow direction of the expanded tube portion 23 is circular with the central axis C as a center and the introducing portion inner diameter Ra as a radius. And as shown in FIG. 3, the flow-path cross-sectional area in the expanded pipe part 23 becomes continuously large, as it goes to the flow direction downstream. The flow passage cross section on the downstream side in the flow direction of the expanded tube portion 23 is circular with the central axis C as a center and the expanded tube portion maximum inner diameter Rb as a radius. The expanded-tube maximum internal diameter Rb shows a larger value than the introduction inner diameter Ra.

The large diameter portion 24 is disposed on the downstream side in the flow direction of the expanded tube portion 23. The large diameter portion 24 according to the first embodiment is configured to have a step portion 24 a having a step in a direction away from the central axis C, and is formed in a circular tubular shape coaxially arranged with the central axis C. ing. As shown in FIG. 3, the internal cross section of the large diameter portion 24 has a circular shape with the central axis C as a center and the large diameter inner diameter Rc as a radius.

The large diameter portion inner diameter Rc indicates a value larger than the introduction portion inner diameter Ra and the expanded portion maximum inner diameter Rb, and is determined to have a difference of a predetermined value with the expanded portion maximum inner diameter Rb. The size of the step in the step portion 24a can be expressed by the difference between the inner diameter Rc of the large diameter portion and the maximum inner diameter Rb of the expanded portion.

By having the step portion 24 a, the internal cross-sectional area of the large diameter portion 24 is larger than the flow passage cross-sectional area on the downstream side in the flow direction of the expanded tube portion 23. That is, when the large diameter portion 24 is reached, the internal cross-sectional area of the outer tube 20 rapidly and largely expands.

The inner surface of the outer tube 20 is subjected to a treatment for imparting hydrophilicity. By providing the hydrophilicity, it is possible to suppress the separation of the liquid phase fluid Fl moving along the inner surface of the outer tube 20. Examples of the treatment for imparting hydrophilicity include chemical treatments in which a hydrophilic functional group (for example, a hydroxyl group, a carboxyl group or the like) is directly applied to the inner surface of the outer tube 20.

Moreover, as a target to which hydrophilicity is to be imparted, it is sufficient if hydrophilicity is imparted to the inner surface of the introduction portion 21 and the expanded tube portion 23 in the outer tube 20, and the process is omitted for the inner surface of the large diameter portion 24. It is also possible.

The inner pipe 30 is disposed inside the outer pipe 20 at a downstream portion in the flow direction of the outer pipe 20, and is formed in a circular tubular shape. The inner pipe 30 is disposed coaxially with the central axis C at the introduction portion of the outer pipe 20. The inner pipe 30 functions as an inner pipe in the present disclosure.

As shown in FIG. 5, the gas phase fluid Fg separated from the gas-liquid two-phase fluid mainly flows into the inner pipe 30. The flow passage cross section in the inner pipe 30 has a circular shape centered on the central axis C and having a radius that is a predetermined inner pipe inner diameter Rd. Here, the inner pipe inner diameter Rd according to the first embodiment has the same value as the introduction portion inner diameter Ra.

That is, in the first embodiment, the flow passage in the inner pipe 30 has the same shape as the flow passage in the introduction portion 21 of the outer pipe 20, and the flow passage of the introduction portion 21 is disposed on the extension extending in the flow direction downstream Be done.

As shown in FIG. 3, the upstream end of the inner pipe 30 in the flow direction is disposed inside the downstream portion of the expanded pipe portion 23 of the outer pipe 20, and the downstream end of the inner pipe 30 in the flow direction Extends to the downstream side wall 25 that constitutes the downstream side of the large diameter portion 24.

The inner pipe 30 is arranged to provide a predetermined distance from the inner surface of the outer pipe 20 (i.e., the expanded portion 23 and the large diameter portion 24). That is, on the downstream side in the flow direction of the outer pipe 20, the inner pipe 30 is disposed at a distance from the inside of the outer pipe 20, so the double pipe portion 35 in the liquid recovery apparatus 10 is configured.

An exhaust pipe 31 is connected to the downstream side in the flow direction of the inner pipe 30, and is constituted by a circular pipe formed to extend from the large diameter portion 24 of the outer pipe 20. Accordingly, the gas phase fluid Fg having passed through the inner pipe 30 flows into the exhaust pipe 31.

A gas phase outlet 32 is disposed downstream of the exhaust pipe 31 in the flow direction. The gas phase exhaust port 32 communicates the inside of the exhaust pipe 31 with the outside of the fuel cell system 100. Therefore, the exhaust pipe 31 discharges the gas phase fluid Fg to the outside of the fuel cell system 100 via the gas phase outlet 32.

As shown in FIG. 3, the liquid recovery apparatus 10 has a double pipe portion 35 constituted by an outer pipe 20 and an inner pipe 30. The double pipe portion 35 according to the first embodiment is a portion formed by arranging the expanded portion 23 and the large diameter portion 24 of the outer pipe 20 and the inner pipe 30 in a double manner, and There is a predetermined spacing between the tubes 20. The double pipe portion 35 constitutes a double pipe portion in the present disclosure.

The double pipe portion 35 is configured such that the flow of the gas-liquid two-phase fluid flowing in from the introduction portion 21 flows into the inner pipe 30 and the gap between the outer pipe 20 and the inner pipe 30 in the double pipe portion 35. It functions to branch into the incoming flow.

The double pipe portion 35 on the upstream side in the flow direction is constituted by the expanded portion 23 of the outer pipe 20 and the inner pipe 30. The double pipe portion 35 on the downstream side in the flow direction is constituted by the large diameter portion 24 of the outer pipe 20 and the inner pipe 30, and the gap between the large diameter portion 24 on the downstream side thereof and the inner pipe 30 is large. It is closed by the downstream side wall 25 at the diameter 24.

The liquid recovery apparatus 10 has a liquid phase recovery unit 40 in a part of the double pipe 35. As shown in FIG. 3, the liquid phase recovery unit 40 is configured by arranging the large diameter portion 24 of the outer pipe 20 and the inner pipe 30 in a double manner, and constitutes the downstream side of the double pipe portion 35 in the flow direction doing.

That is, the liquid phase recovery unit 40 according to the first embodiment is disposed so as to surround the outer periphery of the inner pipe 30, and includes the lower portion of the outer periphery of the inner pipe 30. Therefore, the liquid phase recovery unit 40 can recover the liquid phase fluid Fl that has passed between the expanded portion 23 and the inner pipe 30 via the inflow port 41, and store the liquid phase fluid Fl inside. The liquid phase recovery unit 40 functions as a liquid phase recovery unit in the present disclosure.

The inflow port 41 is a portion where the liquid phase fluid Fl or the like flows into the liquid phase recovery portion 40, and in the first embodiment, a connection portion of the expanded portion 23 and the large diameter portion 24 in the outer pipe 20; It is comprised by the clearance gap formed between the inner tubes 30. As shown in FIG.

Here, the flow passage cross-sectional area of the double pipe portion 35 on the upstream side in the flow direction is determined by subtracting the outer cross-sectional area of the inner pipe 30 from the inner cross-sectional area of the expanded pipe portion 23 of the outer pipe 20. The flow passage cross-sectional area of the liquid phase recovery unit 40 corresponding to the downstream side in the flow direction can be obtained by subtracting the outer cross-sectional area of the inner pipe 30 from the inner cross-sectional area of the large diameter portion 24 of the outer pipe 20.

As shown in FIG. 3, since the large diameter inner diameter Rc of the large diameter portion 24 has the step 24 a on the downstream side of the expanded pipe portion 23, it is more sufficient than the expanded inner diameter Rb of the expanded pipe portion 23. large. Also, the outer shape of the inner pipe 30 is constant.

Therefore, the flow passage cross-sectional area of the liquid phase recovery unit 40 has a larger value than the flow passage cross-sectional area of the double pipe portion 35 on the upstream side in the flow direction. As a result, the internal volume of the liquid phase recovery unit 40 can be increased, so that the liquid phase fluid Fl separated from the gas-liquid two-phase fluid can be recovered and stored more.

A drain pipe 45 is connected to the lower portion of the liquid phase recovery unit 40, and has a liquid phase outlet 46 at its end. Since the drain pipe 45 is connected to the recovered water flow path 11 of the fuel cell system 100 via the liquid phase outlet 46, the liquid phase fluid Fl recovered by the liquid phase recovery unit 40 (ie, the generated water) ) Can be discharged into the recovered water channel 11. The drain 45 corresponds to the drain in the present disclosure.

As described above, in the fuel cell system 100, the liquid phase fluid Fl recovered by the liquid phase recovery unit 40 is used in various applications in order to improve the power generation capacity of the fuel cell system 100. For example, it is used for cooling of the radiator 4 and humidification of the electrolyte membrane in the fuel cell 1.

The drainage pipe 45 may be connected to the lower portion of the liquid phase recovery unit 40, and various modes can be adopted for the method of taking it out. For example, as shown in FIG. 2, FIG. 3 etc., it is not limited to the example which connects the drainage pipe 45 so that it may extend below from the undersurface of liquid phase recovery part 40, The side of liquid phase recovery part 40 The drainage pipe 45 may be connected so as to extend horizontally from the lower portion thereof.

Here, in order to facilitate understanding of the liquid recovery apparatus 10 according to the first embodiment, a conventionally known gas-liquid separator S will be described with reference to FIG.

First, the configuration of the conventional gas-liquid separator S shown in FIG. 4 will be described. The gas-liquid separator S is configured using an outer pipe Po and an inner pipe Pi having different diameters. The outer pipe Po is a large-diameter cylindrical straight pipe constituting the casing of the gas-liquid separator S, and has an inlet I at the end of which a gas-liquid two-phase fluid is introduced.

The inner pipe Pi is a cylindrical straight pipe having a diameter smaller than the inner diameter of the outer pipe Po, and is coaxially attached to the outer pipe Po inside the outer pipe Po by welding. The end E of the inner pipe Pi on the inlet I side does not extend to the inlet I of the outer pipe Po, and is located downstream of the inlet I. A gas outlet Og is disposed on the opposite side of the inner pipe Pi.

As shown in FIG. 4, a clearance Is is formed between the large-diameter outer pipe Po and the small-diameter inner pipe Pi so as to surround the outer circumference of the inner pipe Pi. The downstream side of the gap portion Is is closed by the downstream side wall portion Wd. A liquid discharge port Ol is disposed in the lower part of the outer pipe Po that constitutes the gap portion Is, and is connected to a tank or the like (not shown) via a liquid discharge pipe D.

Next, the flow of the gas-liquid two-phase fluid inside the gas-liquid separator S will be described. In the process from the inlet I to the inside of the gas-liquid separator S, the liquid phase fluid Fl contained in the gas-liquid two-phase fluid flows along the inner peripheral wall surface of the outer pipe Po. At this time, the gas phase fluid Fg in the gas-liquid two-phase fluid is diverted at the end E of the inner pipe Pi into the gap Is disposed inside the inner pipe Pi and around the inner pipe Pi.

The gas phase fluid Fg which has flowed into the inside of the inner pipe Pi flows as it is through the inside of the inner pipe Pi, and is discharged to the outside of the gas-liquid separator S from the gas outlet Og. On the other hand, with regard to the gas phase fluid Fg having flowed into the clearance Is, ideally, the liquid phase fluid Fl adhering to the inner peripheral wall surface of the outer pipe Po is flushed while passing through the clearance Is while It flows into the outlet Ol and the liquid discharge pipe D.

Here, in the gas-liquid separator S as shown in FIG. 4, the flow passage cross-sectional area in the gap portion Is is very small compared to the flow passage cross-sectional area inside the inner pipe Pi, and the liquid discharge port Ol The flow passage cross-sectional area of the liquid discharge pipe D is also formed small.

For this reason, in the gas-liquid separator S, when the flow rate of the gas-liquid two-phase fluid introduced from the inlet I is large, the pressure loss in the clearance Is increases, and the clearance E from the end E of the inner pipe Pi The flow of the gas-phase fluid Fg toward Is is stagnant.

At this time, around the end E of the inner pipe Pi, the gas phase fluid Fg divided at the end E flows along the outer peripheral surface of the inner pipe Pi. However, since the flow of the gas phase fluid Fg and the liquid phase fluid Fl within the gap portion Is stagnant, the gas phase fluid Fg around the end E may flow into the gap portion Is further. Can not.

As a result, the flow of the gas phase fluid Fg around the end E changes the flow direction to the inner peripheral wall surface side of the outer pipe Po, and then the inner peripheral wall surface of the outer pipe Po is directed to the inlet I side. It will flow. That is, as shown in FIG. 4, in the gas-liquid separator S, a vortex flows around the end E of the inner pipe Pi, and the vortex flows along the inner peripheral wall surface of the outer pipe Po. Act to push Fl back to the inlet I side.

Thereby, in the gas-liquid separator S, the flow of the liquid phase fluid Fl along the inner peripheral wall surface of the outer pipe Po is interrupted by the vortex generated around the end E in the inner pipe Pi, so the liquid phase fluid Fl is Recovery rate of

In addition, the flow of the gas phase fluid Fg from the end E toward the inside of the inner pipe Pi may act on the liquid phase fluid Fl accumulated around the end E of the inner pipe Pi by the vortex flow. That is, the flow of the gas phase fluid Fg directed to the inside of the inner pipe Pi may cause part of the staying liquid phase fluid Fl to be scattered.

In this case, a part of the liquid phase fluid Fl scattered by the gas phase fluid Fg is discharged from the gas outlet Og through the inside of the inner pipe Pi. That is, also in this point, the gas-liquid separator S reduces the recovery rate of the liquid phase fluid Fl.

Subsequently, the flow of the gas-liquid two-phase fluid in the liquid recovery apparatus 10 according to the first embodiment will be described with reference to FIG. In the liquid recovery apparatus 10 configured as described above, the gas-liquid two-phase fluid discharged from the fuel cell 1 flows into the inside from the introduction part 21 of the outer pipe 20 via the air passage 2.

The liquid phase fluid Fl contained in the gas-liquid two-phase fluid flows along the inner surface of the outer pipe 20 in the process of flowing from the introduction portion 21 to the double pipe portion 35. On the other hand, the gas phase fluid Fg flows in the central portion of the flow passage remote from the inner surface of the outer tube 20. At the center of the flow passage of the outer tube 20, the gas phase fluid Fg occupies most, and contains a small amount of mist-like liquid phase fluid Fl which can not be confirmed visually.

Then, on the inner surface of the outer tube 20, the liquid phase fluid Fl basically flows throughout. At this time, due to the gravity acting on the liquid phase fluid Fl, the liquid phase fluid Fl in the lower part of the inner surface of the outer pipe 20 flows more than the upper part or the side part in the inner surface of the outer pipe 20.

When the gas-liquid two-phase fluid flowing in the state as shown in FIG. 5 reaches the double pipe portion 35, the flow of the gas-liquid two-phase fluid is carried out at the end of the inner pipe 30 in the double pipe portion 35. And the flow flowing into the gap between the outer pipe 20 and the inner pipe 30 in the double pipe portion 35.

In the liquid recovery apparatus 10 according to the first embodiment, the inner pipe 30 is formed to have the same flow channel cross-sectional area as the flow channel cross-sectional area of the introduction portion 21 and coaxially with the central axis C of the introduction portion 21 Is located in

Therefore, according to the liquid recovery apparatus 10, the flow of the gas phase fluid Fg flowing in the central portion of the flow path in the introduction unit 21 can smoothly flow into the inside of the inner pipe 30, and from the introduction unit 21 to the exhaust pipe The pressure loss up to 31 can be kept small.

Then, the liquid phase fluid Fl adhering to the inner surface of the outer pipe 20 moves toward the double pipe portion 35 by the wind force of the gas-liquid two-phase fluid flowing on the inner surface of the outer pipe 20. When passing through the gap between the expanded portion 23 and the inner pipe 30 in the double pipe portion 35, the gas-liquid two-phase fluid flows into the liquid phase recovery portion 40 and flows along the outer peripheral surface of the inner pipe 30.

As described above, the liquid phase recovery unit 40 is constituted by the large diameter portion 24 having the step portion 24 a and the inner pipe 30, and the flow passage cross sectional area between the two is compared with the upstream side of the double pipe portion 35. It is getting bigger rapidly. Therefore, even when the flow rate of the gas-liquid two-phase fluid introduced from the introducing part 21 is increased, a sufficient space can be secured inside the liquid phase recovery part 40, so the double pipe part 35 It can suppress that the flow of the gaseous fluid Fg from the liquid phase recovery part 40 stops.

Further, when flowing into the inside of the liquid phase recovery unit 40, the gas phase fluid Fg changes the flow direction by the downstream side wall 25 and forms a vortex in the inside of the liquid phase recovery unit 40. In the liquid recovery apparatus 10, the gap between the expanded portion 23 and the inner pipe 30 is formed sufficiently short on the downstream side in the flow direction, and the inflow port 41 is disposed on the inner diameter side of the step portion 24a. An eddy current can be reliably generated inside the liquid phase recovery unit 40.

As shown in FIGS. 4 and 5, the center of the vortex generated inside the liquid phase recovery unit 40 is at a position farther from the central axis C than the inlet 41, so the inlet 41 is around the inlet 41. Form a flow in the direction of drawing the liquid phase fluid Fl that has passed through the liquid phase recovery unit into the liquid phase recovery unit. Thereby, the gas phase fluid Fg and the liquid phase fluid Fl flow smoothly into the liquid phase recovery unit 40 from the inflow port 41. In other words, the liquid recovery device 10 can suppress the generation of the eddy current in the gap between the expanded pipe portion 23 and the inner pipe 30 (that is, the portion on the upstream side of the inflow port 41 in the double pipe portion 35).

In addition, the liquid phase recovery unit 40 is located on the downstream side of the upstream end of the inner pipe 30 in the flow direction, and a vortex is generated inside the liquid phase recovery unit 40, so the gas phase fluid Fg Flows into the gap between the expanded portion 23 and the inner pipe 30 without being disturbed by the vortex flow, and reaches the inside of the liquid phase recovery portion 40.

Then, the gas phase fluid Fg smoothly passes through the gap between the expanded pipe portion 23 and the inner pipe 30 so that the liquid phase fluid Fl attached to the inner surface of the outer pipe 20 is recovered by the wind force of the gas phase fluid Fg. It smoothly flows into the inside of the part 40.

In this point, according to the liquid recovery apparatus 10, the occurrence of the eddy current in the gap between the outer pipe 20 and the inner pipe 30 is suppressed, whereby the liquid phase fluid Fl is retained around the opening edge of the inner pipe 30. It can be suppressed. Thereby, the liquid recovery apparatus 10 can suppress the flow of a part of the liquid phase fluid Fl into the inner pipe 30 by the gas phase fluid Fg flowing into the inner pipe 30, and the liquid separated from the gas-liquid two-phase fluid The recovery rate of the phase fluid Fl can be improved.

Moreover, the expanded pipe part 23 which comprises the outer pipe | tube 20 is comprised so that the flow-path cross-sectional area may be continuously expanded, as it goes to the flow direction downstream. As a result, as shown in FIG. 3, the distance between the inner surface of the expanded portion 23 and the opening edge of the inner pipe 30 can be increased, so the gas phase fluid Fg directed from the inner surface of the outer pipe 20 to the inner pipe 30 Flow can be suppressed.

Thereby, the liquid recovery apparatus 10 can suppress separation and flow of the liquid phase fluid Fl attached to the inner surface of the outer pipe 20 into the inside of the inner pipe 30, and the recovery rate of the liquid phase fluid Fl is It is possible to suppress the decline.

Furthermore, since the inner surface of the outer tube 20 is provided with hydrophilicity, the liquid recovery apparatus 10 can suppress the separation of the liquid phase fluid Fl attached to the inner surface of the outer tube 20. As a result, the liquid recovery apparatus 10 can suppress the inflow of the liquid phase fluid Fl attached to the inner surface of the outer pipe 20 into the inside of the inner pipe 30, and can promote the inflow to the liquid phase recovery unit 40. The recovery rate of the liquid phase fluid Fl can be further enhanced.

Further, as shown in FIGS. 2 and 3 etc., in the liquid recovery apparatus 10, the liquid phase recovery unit 40 is disposed so as to surround the outer periphery of the inner pipe 30, and includes a lower portion of the outer periphery of the inner pipe 30. It is. Therefore, according to the liquid recovery apparatus 10, the liquid phase fluid Fl attached to the inner surface of the outer tube 20 can be recovered without being affected by the deviation of distribution due to gravity.

As described above, according to the liquid recovery apparatus 10 according to the first embodiment, the gas-liquid two-phase fluid introduced from the introduction part 21 of the outer pipe 20 is formed by the outer pipe 20 and the inner pipe 30. By passing the heavy pipe portion 35, the liquid phase fluid Fl can be separated and recovered in the liquid phase recovery unit 40, and the separated gas phase fluid Fg can be discharged from the exhaust pipe 31. Then, the liquid recovery apparatus 10 can discharge the liquid phase fluid Fl recovered inside the liquid phase recovery unit 40 to the outside through the drain pipe 45.

Here, in the liquid recovery apparatus 10, the liquid phase recovery unit 40 is disposed on the downstream side in the flow direction of the double pipe portion 35, and is configured by the large diameter portion 24 including the step portion 24a and the inner pipe 30. . Further, as shown in FIG. 3, since the large diameter inner diameter Rc is larger than the largest diameter Rb of the expanded tube portion, the flow channel cross-sectional area of the liquid phase recovery portion 40 is the flow passage upstream of the double pipe portion 35 in the flow direction. It is formed larger than the cross-sectional area.

For this reason, in the liquid recovery apparatus 10, a flow of fluid generates a vortex in the liquid phase recovery unit 40 after being introduced into the double pipe 35. That is, since the liquid recovery device 10 generates a vortex flow downstream of the portion where the fluid flows into the double pipe portion 35, the movement of the liquid phase fluid Fl along the inner surface of the outer pipe 20 is When flowing into the heavy pipe portion 35, it is not disturbed by the vortex flow.

Thereby, according to the liquid recovery apparatus 10, the liquid phase fluid Fl moving along the inner surface of the outer pipe 20 can smoothly flow into the liquid phase recovery unit 40, and a wide range of conditions of the gas-liquid two-phase fluid The liquid phase fluid Fl can be recovered at a high recovery rate.

As described above, since the flow passage cross-sectional area of the liquid phase recovery unit 40 is formed larger than the flow passage cross-sectional area on the upstream side in the flow direction of the double pipe portion 35, there are many in the liquid phase recovery unit 40. Liquid phase fluid Fl can be stored.

That is, even when the flow rate of the liquid phase fluid Fl flowing into the liquid phase recovery unit 40 is increased, the liquid recovery apparatus 10 can suppress the outflow of the liquid phase fluid Fl via the inner pipe 30. That is, the liquid recovery device 10 can cope with a wide range of conditions regarding the amount of the liquid phase fluid Fl contained in the gas-liquid two-phase fluid, and can recover the liquid phase fluid Fl with a high recovery rate.

Further, the liquid phase recovery unit 40 is disposed so as to surround the entire circumference of the inner pipe 30, and includes the lower portion of the inner pipe 30, so all liquid phase fluids flowing into the double pipe portion 35 Fl can be recovered. That is, the liquid recovery apparatus 10 can improve the recovery rate of the liquid phase fluid Fl in the outer pipe 20. Then, the liquid phase recovery unit 40 reliably recovers the liquid phase fluid Fl to improve the recovery rate even when the distribution of the liquid phase fluid Fl along the inner surface of the outer tube 20 is uneven due to gravity. Can.

As shown in FIG. 2, FIG. 3 and FIG. 5, the outer pipe 20 has the expanded portion 23 downstream of the introduction portion 21 in the flow direction, and the expanded portion 23 has a flow passage The cross-sectional area is configured to increase continuously.

Thus, the liquid recovery apparatus 10 increases the distance from the inner surface of the expanded portion 23 to the inside of the inner pipe 30 to suppress the flow of the gas phase fluid Fg from the inner surface of the expanded portion 23 toward the inside of the inner pipe 30. can do. That is, the liquid recovery apparatus 10 can prevent separation of the liquid phase fluid Fl from the inner surface of the outer tube 20 by the flow of the gas phase fluid Fg, and can improve the recovery rate of the liquid phase fluid Fl.

As shown in FIG. 2, FIG. 3, etc., in the liquid recovery apparatus 10, the inner pipe 30 is disposed coaxially with the central axis C in the introduction portion 21 of the outer pipe 20. Therefore, according to the liquid recovery apparatus 10, the gas phase fluid Fg flowing through the central portion of the introduction portion 21 can smoothly flow into the inside of the inner pipe 30, and the pressure loss from the outer pipe 20 to the inner pipe 30. Can be kept small.

Further, since the inner pipe inner diameter Rd of the inner pipe 30 is equal to the inner diameter Ra of the introducing portion 21 of the introducing portion 21, the liquid recovery apparatus 10 smooths the gas phase fluid Fg flowing through the central portion of the introducing portion 21. Can flow into the interior of the inner pipe 30. As a result, the liquid recovery device 10 can suppress the pressure loss from the outer pipe 20 to the inner pipe 30 to a low level.

Second Embodiment
Subsequently, a second embodiment different from the above-described first embodiment will be described with reference to FIG. The liquid recovery apparatus 10 according to the second embodiment constitutes a part of a fuel cell system 100 mounted on an electric vehicle (fuel cell vehicle) as in the first embodiment.

The liquid recovery apparatus 10 according to the second embodiment is disposed on the downstream side of the fuel cell 1 in the air passage 2 of the fuel cell system 100 as in the first embodiment, and the gas and liquid discharged from the fuel cell 1 From the two-phase fluid, the gas phase fluid Fg and the liquid phase fluid Fl are separated to recover the liquid phase fluid Fl.

The liquid recovery apparatus 10 is configured to include an outer pipe 20, an inner pipe 30, an exhaust pipe 31, and a drainage pipe 45, as in the first embodiment. The outer tube 20 according to the second embodiment includes the introduction portion 21, the expanded portion 23, and the large diameter portion 24, but the shape of the large diameter portion 24 is different from that of the first embodiment.

As shown in FIG. 6, the large diameter portion 24 according to the second embodiment is configured to have a stepped portion 24 a such that a portion corresponding to the lower side of the inner pipe 30 is largely separated from the central axis C. That is, in the liquid recovery apparatus 10 according to the second embodiment, the liquid phase recovery unit 40 is formed to bulge downward of the inner pipe 30, and the flow path cross-sectional area in the liquid phase recovery unit 40 is It is formed larger than the flow passage cross-sectional area of the upstream side portion of the double pipe portion 35 in the flow direction.

Thereby, the liquid recovery apparatus 10 generates a vortex flow of the gas phase fluid Fg in the liquid phase recovery unit 40 disposed on the downstream side in the flow direction of the double pipe unit 35 as in the first embodiment. It is possible to improve the recovery rate of the liquid phase fluid Fl.

Further, as in the first embodiment, the exhaust pipe 31 is connected to the downstream side in the flow direction of the inner pipe 30, and the drainage pipe 45 is connected to the lower portion of the liquid phase recovery unit 40. Accordingly, the liquid recovery apparatus 10 according to the second embodiment discharges the gas phase fluid Fg separated from the gas-liquid two-phase fluid to the outside of the fuel cell system 100 as in the first embodiment, and the liquid phase recovery unit 40 The liquid phase fluid Fl (that is, generated water) collected in the above can be discharged to the collected water channel 11.

As described above, also in the liquid recovery apparatus 10 according to the second embodiment, the flow passage cross-sectional area of the liquid phase recovery unit 40 is formed larger than the flow passage cross-sectional area of the double pipe portion 35 corresponding to the upstream portion in the flow direction It is done.

Therefore, as in the first embodiment, the liquid recovery apparatus 10 generates an eddy current of the gas phase fluid Fg in the liquid phase recovery unit 40 disposed on the downstream side of the double pipe 35 in the flow direction. And the recovery rate of the liquid phase fluid Fl can be improved.

Here, the distribution of the liquid phase fluid Fl on the inner surface of the outer pipe 20 tends to be distributed more toward the lower side of the outer pipe 20 due to the influence of gravity acting on the liquid phase fluid Fl. Therefore, the liquid recovery apparatus 10 enlarges the cross-sectional area of the flow passage corresponding to the lower portion of the exhaust pipe 31 to configure the liquid phase recovery unit 40, so that the distribution of the liquid phase fluid Fl inside the outer pipe 20 is The liquid phase fluid Fl can be recovered efficiently.

Further, in the portion excluding the lower portion of the exhaust pipe 31, there is no need to increase the cross sectional area of the flow path by the large diameter portion 24, so that the change in the cross sectional area of the flow path can be minimized. That is, according to the liquid recovery apparatus 10 of the second embodiment, it is possible to improve the recovery rate of the liquid phase fluid Fl while suppressing the increase in size of the apparatus.

Third Embodiment
Next, a third embodiment different from the above-described embodiments will be described with reference to FIG. The liquid recovery apparatus 10 according to the third embodiment constitutes a part of a fuel cell system 100 mounted on an electric vehicle (fuel cell vehicle) as in the above-described embodiment.

The liquid recovery apparatus 10 according to the third embodiment is disposed on the downstream side of the fuel cell 1 in the air passage 2 of the fuel cell system 100 as in the above-described embodiment, and the gas and liquid discharged from the fuel cell 1 From the two-phase fluid, the gas phase fluid Fg and the liquid phase fluid Fl are separated to recover the liquid phase fluid Fl.

The liquid recovery apparatus 10 is configured to include the outer pipe 20, the inner pipe 30, the exhaust pipe 31, and the drainage pipe 45 as in the above-described embodiment, and in the liquid phase recovery unit 40. Except for the configuration around the inlet 41, it is the same as the first embodiment described above. Therefore, in the following description, the periphery of the inflow port 41 in the liquid phase recovery unit 40 will be described.

As shown in FIG. 7, in the liquid recovery apparatus 10 according to the third embodiment, the liquid phase recovery unit 40 is configured by arranging the large diameter portion 24 of the outer pipe 20 and the inner pipe 30 in a double manner. , And the downstream side of the double pipe portion 35 in the flow direction. The large diameter portion 24 according to the third embodiment is also configured to have the stepped portion 24 a as in the above-described embodiment.

And inflow mouth 41 in a 3rd embodiment is constituted by the crevice formed between the connection part of expanded tube part 23 and large diameter part 24 in outer pipe 20, and inner pipe 30, and double pipe part The liquid phase fluid Fl and the like that have passed 35 flow into the liquid phase recovery unit 40.

In the third embodiment, a protrusion 42 is formed at the opening edge of the inflow port 41. The protrusion 42 is formed to project downstream in the flow direction from the opening edge of the inflow port 41, and has a tubular shape surrounding the inflow port 41.

In addition, this protrusion 42 should just be formed so that it may protrude from the opening edge of the inflow port 41 to the flow direction downstream, and it can implement | achieve using various methods. For example, the expanded pipe portion 23 may extend to the downstream side in the flow direction at the connection portion of the expanded pipe portion 23 and the large diameter portion 24 which constitute the inflow port 41. Alternatively, the protrusion 42 may be relatively formed by forming a groove-shaped recess on the inner wall surface of the large diameter portion 24 that constitutes the outer peripheral portion of the connection portion.

According to the liquid recovery apparatus 10, the gas-liquid two-phase fluid that has flowed in from the inflow port 41 is led to the inside of the liquid phase recovery unit 40 by the projection 42, and thus a vortex is generated inside the liquid phase recovery unit 40. It can be done. Moreover, since the said protrusion 42 is formed so that the inflow port 41 may be enclosed, the influence which the gas-liquid two-phase fluid which flows in from the inflow port 41 receives from the gaseous-phase fluid Fg which became a vortex can be suppressed.

As described above, according to the liquid recovery apparatus 10 according to the third embodiment, the inside of the liquid phase recovery unit 40 is formed by forming the protrusion 42 projecting to the downstream side in the flow direction from the opening edge of the inflow port 41 The smooth inflow of the liquid phase fluid Fl or the like to the liquid phase recovery unit 40 can be realized while promoting the generation of the vortex flow in the above.

Thereby, the liquid recovery apparatus 10 can further smooth the flow of the gas-liquid two-phase fluid to the double pipe portion 35 and the liquid phase recovery unit 40, so that the recovery rate of the liquid phase fluid Fl can be improved. Can.

Fourth Embodiment
Then, 4th Embodiment different from each embodiment mentioned above is described, referring FIG. The liquid recovery apparatus 10 according to the fourth embodiment constitutes a part of a fuel cell system 100 mounted on an electric vehicle (fuel cell vehicle), as in the above-described embodiment.

The liquid recovery apparatus 10 according to the fourth embodiment is disposed downstream of the fuel cell 1 in the air passage 2 of the fuel cell system 100 as in the above-described embodiment, and the gas and liquid discharged from the fuel cell 1 From the two-phase fluid, the gas phase fluid Fg and the liquid phase fluid Fl are separated to recover the liquid phase fluid Fl.

The liquid recovery apparatus 10 is configured to include the outer pipe 20, the inner pipe 30, the exhaust pipe 31, and the drainage pipe 45, as in the above-described embodiment. Except for this, it is the same as the first embodiment described above. Therefore, in the following description, the configuration of the outer pipe 20 will be described.

The outer tube 20 according to the fourth embodiment is constituted by the introduction portion 21 and the large diameter portion 24. In the embodiment described above, the outer pipe 20 of the liquid recovery apparatus 10 is configured by the introduction portion 21, the expanded pipe portion 23, and the large diameter portion 24, and thus the difference is that the expanded pipe portion 23 is not provided. It becomes.

The introduction portion 21 according to the fourth embodiment is a portion for introducing the gas-liquid two-phase fluid that has flowed out of the fuel cell 1 into the inside of the outer pipe 20 as in the first embodiment. Make up the side. A flow passage having a circular cross section is formed inside the introduction portion 21.

The flow passage cross section of the introducing portion 21 in the fourth embodiment has a circular shape with the central axis C as a center and a radius of a predetermined introducing portion inner diameter Ra. In this respect, the inner diameter Ra of the introduction portion according to the fourth embodiment shows a value larger than the inner diameter Rd of the inner pipe.

In the outer tube 20 according to the fourth embodiment, the large diameter portion 24 provided with the stepped portion 24 a is disposed on the downstream side in the flow direction of the introduction portion 21. The large diameter portion 24 according to the fourth embodiment is formed in a circular tubular shape coaxially arranged with the central axis C, and the internal cross section is centered on the central axis C and the large diameter portion inner diameter Rc is a radius It has a round shape.

By having the step portion 24a, the large diameter portion inner diameter Rc shows a value larger than the introduction portion inner diameter Ra in this case, and is determined to have a difference of a predetermined value with the introduction portion inner diameter Ra. It is done. Therefore, when the inner cross sectional area of the outer tube 20 reaches the large diameter part 24, the inner cross sectional area of the outer pipe 20 rapidly and largely expands relative to the internal cross sectional area of the introduction part 21.

The inner pipe 30 according to the fourth embodiment is disposed inside the outer pipe 20 at a downstream portion in the flow direction of the outer pipe 20. The inner pipe 30 is formed in the shape of a circular tube having an inner pipe inner diameter Rd, and is disposed coaxially with the central axis C. An exhaust pipe 31 is connected to the flow direction downstream side of the inner pipe 30.

As shown in FIG. 8, the inner pipe 30 is arranged to provide a predetermined distance from the inner surface of the outer pipe 20 (that is, the introduction portion 21 and the large diameter portion 24), and the fourth The double pipe part 35 which concerns on embodiment is comprised.

The liquid phase recovery unit 40 according to the fourth embodiment is configured by arranging the large diameter portion 24 of the outer pipe 20 and the inner pipe 30 doubly, and the downstream side of the double pipe portion 35 in the flow direction is Configured. The flow passage cross-sectional area on the downstream side of the double pipe portion 35 is the flow on the upstream side of the double pipe portion 35 due to the difference between the inner diameter Ra of the introduction portion 21 and the inner diameter Rc of the large diameter portion 24 of the large diameter portion 24. It is larger than the road cross section and is rapidly enlarged.

Therefore, as in the first embodiment, the liquid recovery apparatus 10 according to the fourth embodiment separates the liquid phase fluid Fl from the gas-liquid two-phase fluid that has passed through the double pipe portion 35, and the liquid phase recovery unit 40. Can be collected and stored.

Further, according to the liquid recovery apparatus 10, the internal volume of the liquid phase recovery unit 40 can be made sufficiently large, so that more recovered liquid phase fluid Fl can be stored, and a large amount of liquid phase fluid Fl is obtained. It can cope with the case of flowing into the

As described above, according to the liquid recovery apparatus 10 according to the fourth embodiment, even when the outer pipe 20 is configured by the introduction portion 21 and the large diameter portion 24, the gas phase from the gas-liquid two-phase fluid The fluid Fg and the liquid phase fluid Fl can be separated, and the liquid phase fluid Fl can be recovered.

Also in this case, since the gas-liquid two-phase fluid that has passed through the double pipe portion 35 generates an eddy current inside the liquid phase recovery portion 40, the flow when flowing into the double pipe portion 35 is an eddy current. There is no hindrance.

As a result, the liquid recovery apparatus 10 can smoothly move the liquid phase fluid Fl along the inner surface of the outer pipe 20 to flow into the liquid phase recovery unit 40, so that the recovery rate of the liquid phase fluid can be increased. It can be improved.

(Other embodiments)
Although the present disclosure has been described above based on the embodiments, the present disclosure is not limited to the above-described embodiments. That is, various improvements and modifications are possible without departing from the scope of the present disclosure. For example, the above-described embodiments may be combined as appropriate, or various modifications of the above-described embodiments may be made.

(1) In the embodiment described above, the liquid recovery apparatus according to the present disclosure is applied to the fuel cell system 100, but the present invention is not limited to this aspect. The liquid recovery apparatus according to the present disclosure can be applied to various apparatuses and systems as long as it has an application of separating a gas-liquid two-phase fluid into a gas phase fluid and a liquid phase fluid and recovering the liquid phase fluid. .

(2) Moreover, although the double pipe part 35 which concerns on this indication is not limited to a structure like embodiment mentioned above, the front-end | tip part of the inner pipe 30 and the large diameter part 24 in the double pipe part 35 It is desirable that the positional relationship of the upstream face of the above is within a predetermined size range.

In other words, it is desirable that the flow direction upstream side of the liquid phase recovery unit 40 in the double pipe portion 35 has a predetermined flow path length. If this portion is longer than necessary, a vortex may be generated before flowing into the inside of the large diameter portion 24. Therefore, it is preferable that the vortex is generated in the liquid phase recovery unit 40. .

(3) Then, in the above-described embodiment, the inner surface of the outer tube 20 is subjected to chemical treatment to directly impart hydrophilic functional groups (for example, hydroxyl group, carboxyl group) to the surface to obtain hydrophilicity. Although applied, it is not limited to this aspect.

As long as the inner surface of the outer tube 20 can be provided with hydrophilicity, various methods can be adopted. For example, plasma treatment, photocatalyst, formation of fine irregularities, coating, etc. may be performed.

(4) In the embodiment described above, the exhaust pipe 31 is connected to the downstream side of the flow direction of the inner pipe 30, and the drainage pipe 45 is connected to the lower part of the liquid phase recovery unit 40, but this embodiment is limited It is not something to be done. The shape may be any shape capable of discharging the gas phase fluid Fg or the shape capable of discharging the liquid phase fluid Fl, and does not have to protrude in a tubular shape toward the outside of the liquid recovery apparatus 10.

(5) And in the embodiment mentioned above, although outer tube 20, inner tube 30, exhaust pipe 31, and drainage pipe 45 are explained as a cylindrical shape pipe, this indication is not limited to this. Absent. Each configuration in the present disclosure only needs to constitute a flow path through which a fluid can pass, and the cross-sectional shape is not limited.

For example, it may be a channel whose cross-sectional shape is a polygon, or it may be a channel whose cross-sectional shape is an oval. In addition, the outer pipe 20, the exhaust pipe 31, and the drainage pipe 45 in the liquid recovery apparatus 10 can be appropriately changed in appearance.

Claims

An outer pipe (20) having an inlet (21) into which a gas-liquid two-phase fluid is introduced;
The gas phase fluid separated from the gas-liquid two-phase fluid is disposed inside the outer pipe at a position where the introduction portion extends downstream with respect to the flow direction of the gas-liquid two-phase fluid in the introduction portion. With the inner pipe (30) to discharge,
A double pipe portion (35) configured by arranging the inner pipe at a predetermined interval with respect to the inner side of the outer pipe on the downstream side in the flow direction of the outer pipe;
At the downstream side in the flow direction in the double pipe portion, it is configured to have a flow channel cross-sectional area larger than the flow channel cross-sectional area on the upstream side in the flow direction of the double pipe portion. A liquid phase recovery unit (40) for recovering the separated liquid phase fluid;
And a drainage pipe (45) connected to a lower portion of the liquid phase recovery unit and discharging the liquid phase fluid recovered by the liquid phase recovery unit.
A large diameter portion (24) configured to have a stepped portion (24a) formed in a direction away from the inner pipe is disposed in the outer pipe on the downstream side in the flow direction of the double pipe portion,
The liquid phase recovery unit according to claim 1, wherein the large diameter portion of the outer pipe makes the flow passage cross sectional area larger than the flow passage cross sectional area on the upstream side in the flow direction of the double pipe portion. Liquid recovery equipment.
The liquid recovery apparatus according to claim 1, wherein the liquid phase recovery unit is disposed so as to include at least a lower portion of an outer periphery of the inner pipe.
The liquid recovery apparatus according to any one of claims 1 to 3, wherein the liquid phase recovery unit is disposed so as to surround the entire outer periphery of the inner pipe.
5. The outer pipe according to claim 1, wherein the outer pipe has an expanded portion (23) whose flow passage cross-sectional area continuously increases as it goes downstream in the flow direction on the downstream side in the flow direction with respect to the introduction portion. The liquid recovery device according to any one.
The liquid recovery device according to any one of claims 1 to 5, wherein the inner pipe is coaxially disposed with respect to the introduction portion of the outer pipe.
The liquid recovery apparatus according to any one of claims 1 to 6, wherein an inner diameter (Rd) of the inner pipe is equal to an inner diameter (Ra) of the introduction portion.
The inflow port (41) into which a part of the gas-liquid two-phase fluid flows into the liquid phase recovery part is formed with a protrusion (42) projecting to the downstream side in the flow direction. The liquid recovery apparatus according to any one of 7.