JP2001153503A - Bleeding device and absorption refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bleeding device to perform constitution easily and at a low cost and have high bleeding performance and to provide an absorption refrigerating machine to provide high refrigerating capacity and reduce a cost. SOLUTION: An absorption refrigerating machine 1 is provided with a bleeding device 70 to recover refrigerating gas RG by bleeding the internal part of an absorber 20 and separate non-condensed gas NC. The bleeding device 70 comprises a bleeding chamber 73 communicating with the internal part of the absorber 20 and introducing an absorption solution Y', a faucet part 81 situated such that the absorption solution Y flows in from a periphery; a nozzle 78 to inject an absorption solution Y toward the faucet part 81; and a separation chamber 74 communicating with the bleeding chamber 73 through the faucet part 81 and separating non-condensed gas NC from an absorption solution Y absorbing refrigerant gas RG, and storing the absorption solution Y and the non-condensed gas NC. A protrusion part 78b to generate turbulence at a gas liquid interface between a jet toward the faucet part 81 from a nozzle 78 and peripheral gas is formed on a throttle opening part 78a of the nozzle 78.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extraction device for extracting air inside an absorber of an absorption refrigerator to separate and recover refrigerant gas and non-condensable gas, and an absorption refrigerator equipped with such an extraction device. About.

[0002]

2. Description of the Related Art Conventionally, absorption chillers that use water as a refrigerant and a lithium bromide solution or the like as an absorption solution and perform a refrigerating action by a so-called absorption cycle have been widely used as air conditioning chillers, cold / hot water heaters, and the like. I have. This type of absorption refrigerator includes an evaporator, an absorber, a regenerator (a high-pressure regenerator and a low-pressure regenerator), a condenser, and the like. A low-temperature refrigerant liquid condensed in the condenser is vaporized in the evaporator. By doing so, a refrigeration action is performed. The refrigerant gas (vapor) vaporized by the evaporator is absorbed by the absorbing solution by the absorber, and the absorbing solution is supplied to the regenerator by the solution pump. The absorbing solution that has absorbed the refrigerant gas is heated by the regenerator, whereby high-pressure refrigerant gas is generated and the refrigerant gas is supplied to the condenser. The high-pressure refrigerant gas is condensed by the condenser into a low-temperature refrigerant liquid and sent to the evaporator. Also, the concentrated absorbent solution separated from the refrigerant in the regenerator is returned to the absorber.

In this case, it is necessary to maintain the inside of the absorption refrigerator at a high degree of vacuum. However, during operation of the absorption refrigerator, gas such as air may be mixed into the interior of the absorber or the interior of the absorber may be mixed. The generation of hydrogen cannot be avoided. Gases other than the refrigerant gas such as air and hydrogen (hereinafter, referred to as “non-condensable gas”) hinder the absorption of the refrigerant gas by the absorbing solution, and cause a reduction in the refrigeration capacity of the absorption refrigerator. It is. Therefore, in order to improve the refrigerating capacity of the absorption refrigerator, it is necessary to efficiently remove the non-condensable gas present inside the absorber. A bleed device is provided. As one example of the air extraction device, a so-called ejector-type air extraction device such as that disclosed in Japanese Patent Application Laid-Open No. 7-19670 is known.

[0004] This type of ejector-type bleeding device includes an outer cylinder,
And an inner cylinder disposed in the outer cylinder. An ejector communicating with the inside of the absorber is provided in the middle of the inner cylinder, and an absorbing solution as a driving fluid is supplied to the ejector by a solution pump or the like. Thereby, the refrigerant gas and the non-condensable gas inside the absorber are sucked into the ejector unit, and the air bubbles of the sucked refrigerant gas and the non-condensable gas are entrained in the absorbing solution. The gas-liquid two-phase flow that has flowed down the inner cylinder and flowed into the outer cylinder separates into gas and liquid as the flow velocity decreases, and the non-condensable gas flows into the upper layer inside the outer cylinder, and the absorbing solution that has absorbed the refrigerant gas contains the outer cylinder. Each will be stored in the lower layer inside.
The non-condensable gas stored in the outer cylinder is appropriately discharged by a vacuum pump or the like.

[0005]

However, the above-described conventional bleeding device (absorption chiller) has the following problems. That is, the inside of the absorber to be bled has a very high degree of vacuum (for example, 5 to 7 mmHg).
), It was difficult for the ejector-type bleeding device to bleed the inside of the absorber sufficiently. For this reason, absorption of the refrigerant gas in the absorber is hindered, and the refrigeration capacity of the absorption refrigerator is reduced accordingly.
On the other hand, in such an ejector type extraction device, if the non-condensable gas and the refrigerant gas to be suctioned are cooled between the absorber and the extraction device, the extraction performance can be improved.
In this case, the cost of the absorption refrigerator increases due to the provision of a heat exchanger or the like for cooling the suction target.

Therefore, the present invention has a simple configuration, can be configured at low cost, and has a high bleeding performance, and a bleeding device capable of satisfactorily bleeding the inside of an absorber and having high refrigeration. It is an object of the present invention to provide an absorption refrigerator capable of demonstrating its ability and reducing costs.

[0007]

According to a first aspect of the present invention, there is provided an air extraction apparatus for extracting air inside an absorber of an absorption refrigerator to separate and recover refrigerant gas and non-condensable gas. A bleed chamber that communicates with the interior of the absorber and into which an absorbing solution that absorbs the refrigerant gas is introduced, and a mouth portion that is arranged so that the absorbing solution in the bleed chamber flows from the surroundings,
The nozzle for injecting the absorbing solution toward the mouth and the bleeding chamber are connected via the mouth to separate the non-condensable gas from the absorbing solution that has absorbed the refrigerant gas. It is characterized by comprising a separation chamber for storing gas and turbulence forming means for forming turbulence at a gas-liquid interface between a jet flowing from a nozzle toward a mouthpiece and a surrounding gas.

The bleeding device bleeds the inside of the absorber by a so-called plunging jet function (a function of a collision jet). That is, the absorbing solution is introduced into the bleeding chamber communicating with the inside of the absorber, for example, so as to flow down along the inner wall thereof. Also, in the bleeding chamber, for example, a mouth portion formed in a bell mouth shape is arranged,
The absorption solution in the bleed chamber flows into the mouth from the surroundings, and overflows around the mouth. Further, the absorbing solution is sprayed from the nozzle toward the mouth so as to collide with the absorbing solution overflowing from the mouth.

As a result, an air pocket is formed at a collision portion between the absorbing solution jetted from the nozzle and the absorbing solution overflowing at the mouth portion, and bubbles (non-condensable gas and refrigerant gas) are generated by the so-called plunging jet action. Entangled in absorption solution in pocket. As a result, in conjunction with the absorption of the refrigerant gas by the absorbing solution, the pressure in the bleed chamber decreases, and the non-condensable gas and the refrigerant gas inside the absorber are efficiently sucked into the bleed chamber. The absorbing solution containing bubbles of the non-condensable gas and the refrigerant gas flows into the separation chamber through the mouthpiece, where the absorbing solution absorbing the refrigerant gas and the separated non-condensable gas are stored. Is done.

[0010] Heretofore, it has been considered that it is conventionally preferable that the absorption solution of the blanching jet type is gently jetted from the nozzle to the mouth part as a jet without disturbance. On the other hand, the present inventors have conducted intensive studies on the plunging jet type bleeding device, and as a result, the gas-liquid interface between the jet flowing from the nozzle toward the mouth and the surrounding gas (non-condensable gas and refrigerant gas) has been found. It has been found that the bleeding performance of the bleeding device is significantly improved by forming the turbulence. In other words, by disturbing only the gas-liquid interface without disturbing the core of the jet flowing out of the nozzle, the amount of bubbles trapped in the mouth can be dramatically increased. Based on this, the bleeding device is provided with a turbulent flow forming means. As described below, the turbulence forming means can be configured very simply, and as a result, a bleed device having high bleed performance can be configured at low cost.

In this case, it is preferable that the turbulence forming means comprises a projection projecting inward from an edge of the opening of the nozzle.

In such a configuration, when the absorbing solution supplied to the nozzle is ejected from the opening (throttle opening), the absorbing solution is contracted and comes into contact with the projection, so that the size of the apparatus is reduced. By appropriately setting the amount of protrusion of the protrusion in accordance with the supply amount of the absorbing solution, it is possible to extremely easily disturb only the gas-liquid interface without disturbing the core of the jet. Also, such a nozzle can be easily configured,
The amount of protrusion of the protrusion can also be set with high accuracy. In this case, it is preferable to form a plurality of protrusions on the edge of the opening.

Further, it is preferable that a plurality of projections are provided, and the edge of the opening is formed in an arc shape bulging outward between the projections.

Under such a configuration, the absorbing solution is
The absorbing solution that comes into contact with the projections when it contracts by passing through the opening of the nozzle, but diffuses outward with an outward velocity vector near the arc-shaped edge, and the cross-sectional area of the jet Will spread somewhat as you approach the spout. That is, the cross-sectional shape of the jet includes an indented portion. For example, if four projections are provided for the opening and the edge between the projections is formed in an arc shape, the cross-sectional shape of the jet flowing out of the nozzle becomes substantially cross-shaped, and As a result, four depressions are formed. The depression formed in this way functions as an air pocket for trapping air bubbles when colliding with the overflowing absorbent solution at the mouthpiece. Therefore, if such a configuration is adopted, the area in which bubbles are trapped is further increased, and the amount of trapped bubbles in the mouthpiece can be further increased.

Preferably, the turbulent flow forming means comprises a projection arranged so as to come into contact with the gas-liquid interface between the jet flowing out of the opening of the nozzle and the surrounding refrigerant gas.

Even if such a configuration is adopted, it is possible to easily disturb only the gas-liquid interface between the jet flowing from the nozzle toward the mouth and the surrounding gas without disturbing the core of the jet. Can effectively increase the amount of air bubbles involved. Also in this case, it is preferable to provide a plurality of protrusions for the nozzle.

On the other hand, the turbulent flow forming means may change the sectional area of the jet flowing from the nozzle toward the mouth portion with time.

As described above, if the cross-sectional area of the jet flowing from the nozzle to the mouth portion is temporally changed by the turbulence forming means, a plurality of depressions (from the nozzle toward the mouth portion) are formed on the outer periphery of the jet flow. Disturbance) is formed. The depression formed in this way functions as an air pocket for trapping air bubbles when colliding with the overflowing absorbing solution at the mouthpiece. Therefore, even if such a configuration is adopted, it is possible to effectively increase the amount of air bubbles to be caught in the mouthpiece.

In this case, for example, it is preferable to extend a cylindrical body having an inner diameter larger than the opening of the nozzle, or to enlarge the inner diameter of the opening of the nozzle in a tapered shape. Thereby, if the total length of the cylindrical body and the thickness of the opening are appropriately set, the nozzle opening, or the absorbing solution that has been contracted at the upstream end of the opening is near the outlet end of the cylindrical body, or At the downstream end of the opening, adhesion and peeling are repeated in a short cycle, so that the cross-sectional area of the jet flowing from the nozzle toward the mouth can be changed very easily with time.

According to a sixth aspect of the present invention, in the absorption refrigerator, the refrigerant gas generated in the evaporator is absorbed by the absorption solution into the absorption solution. It has a bleed device that separates and collects non-condensable gas, and this bleed device communicates with the inside of the absorber, and a bleed chamber into which an absorbing solution that absorbs the refrigerant gas is introduced, and an absorbing solution in the bleed chamber. A mouth portion arranged to flow from the surroundings, a nozzle for injecting the absorbing solution toward the mouth portion, and communicating with the bleeding chamber through the mouth portion,
Separation of the non-condensable gas from the absorbing solution that has absorbed the refrigerant gas, and a separation chamber for storing the absorbing solution and the non-condensable gas, and a turbulence at the gas-liquid interface between the jet flowing from the nozzle toward the mouth and the surrounding gas. And a turbulence forming means for forming.

The bleeding device included in this absorption refrigerator has a simple configuration, can be configured at low cost, and has high bleeding performance. Therefore, since the inside of the absorber can be efficiently bleed and the non-condensable gas which hinders the absorption of the refrigerant gas can be satisfactorily removed, it is possible to improve the refrigeration capacity of the absorption refrigerator while suppressing the overall cost increase. Can be.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a bleeding apparatus and an absorption refrigerator according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system diagram showing an absorption refrigerator according to the present invention. The absorption refrigerator 1 shown in FIG. 1 is widely applicable as an air-conditioning refrigerator, a chiller / heater, or the like, and uses water as a refrigerant R and a lithium bromide solution or the like as an absorption solution Y.
The refrigeration action is performed by the absorption cycle described above. That is, in the absorption refrigerator 1, the evaporator 10, the absorber 20, the high-pressure regenerator 30, the low-pressure regenerator 40, which constitute the absorption cycle,
In addition, a condenser 50 is included, and a low-temperature refrigerant liquid (water) RL condensed in the condenser 50 is vaporized in the evaporator 10 to perform a refrigeration operation.

The evaporator 10 and the absorber 20 are arranged in the same shell (high vacuum vessel) 2. A heat transfer tube 11 is disposed in the evaporator 10, and the heat transfer tube 11 is supplied with cold water W1 through a cold water inlet line L1. Further, a refrigerant pump P1 is provided for the evaporator 10, and the evaporator 10 is provided by the refrigerant pump P1.
The refrigerant liquid RL is pumped from the inside of the heat transfer pipe 11 via the refrigerant line L11.
Sprayed towards. The sprayed refrigerant liquid RL takes vaporization latent heat from the cold water W1 flowing through the heat transfer tube 11 to be vaporized, and flows into the absorber 20 as refrigerant gas (water vapor) RG.

The cold water W1 flowing through the heat transfer tube 11 is discharged outside through a cold water outlet line L2. The cold water W1 flows into the heat transfer tube 11 at a temperature of, for example, 12 ° C., is cooled, and then is discharged at a temperature of, for example, 7 ° C. via a cold water outlet line L2. The cold water W1 flowing out of the evaporator 10 is used for cooling of a building or a process of a factory, and the temperature of the cold water W1 used for cooling or the like rises to, for example, 12 ° C., and is introduced into the evaporator 10 again. Is done.

Similarly, the heat transfer tube 21 is also provided inside the absorber 20.
Is arranged. Cooling water W2 is supplied to the heat transfer tube 21 via a cooling water line L3. Furthermore, absorber 2
For 0, a first solution pump P2 is provided,
The absorption solution (lithium bromide solution) Y is pumped from the inside of the absorber 20 by the first solution pump P2. The pumped-up absorption solution Y is sprayed toward the heat transfer tube 21 via the solution line L21. Since the absorbing solution Y sprayed on the heat transfer tube 21 absorbs the refrigerant gas RG flowing into the absorber 20, the concentration of the absorbing solution Y decreases, and the diluted absorbing solution Y having the reduced concentration becomes Collected at the bottom. The heat generated in the absorber 20 is recovered by the cooling water W2 flowing in the heat transfer tube 21.

The absorption solution Y collected at the bottom of the absorber 20
Is pumped by the first solution pump P2 and supplied to the high-pressure regenerator 30 via the valve, the low-temperature heat exchanger 3, the solution line L22, the high-temperature heat exchanger 4, and the solution line L23.
The high-pressure regenerator 30 is equipped with a furnace tube, a body housing a heat transfer tube, and a heating burner. The high-pressure regenerator 30 is supplied with a fuel gas G from a fuel gas supply device (not shown), and the fuel gas G is burned in a furnace tube. Thus, the absorption solution Y supplied to the high-pressure regenerator 30 is heated by the heating burner, and a part of the absorbed refrigerant R is vaporized, so that the concentration of the absorption solution Y is increased to a medium level.

The absorption solution Y heated by the high-pressure regenerator 30 and having an increased concentration is supplied to the low-pressure regenerator 40 via the solution line L24 and the high-temperature heat exchanger 4. A heat transfer tube 41 is disposed in the low-pressure regenerator 40, and the refrigerant gas RG vaporized by the high-pressure regenerator 30 is supplied to the heat transfer tube 41 via a refrigerant line L12. Also, the solution line L22
, A solution line L25 is branched on the downstream side of the high-temperature heat exchanger 4, and the dilute absorbing solution Y is sprayed toward the heat transfer tube 41 via the solution line L25. Inside the low-pressure regenerator 40, the absorbing solution Y introduced from the high-pressure regenerator 30 and the solution line L25 via the heat transfer tube 41.
Is heated, a part of the refrigerant R evaporates and the absorbing solution Y
Concentration is further increased. The absorption solution Y having a high concentration is collected at the bottom of the low-pressure regenerator 40, and is again pumped to the absorber 20 by the second solution pump P3.

The condenser 50 is arranged in the same shell 5 as the low-pressure regenerator 40. Inside the condenser 50, a heat transfer tube 51 to which cooling water W2 is supplied via a cooling water line L4 is arranged. I have. Then, the refrigerant gas RG that has been pressurized by flowing through the heat transfer tube 41 of the low-pressure regenerator 40 is supplied into the condenser 50 via the refrigerant line L13. As a result, the refrigerant gas RG flowing into the condenser 50 is cooled and condensed via the heat transfer tube 51 to become a low-temperature refrigerant liquid (water) RL. The refrigerant liquid RL flows into the evaporator 10 via the refrigerant line L14 due to a pressure difference and a gravity difference between the inside of the condenser 50 and the inside of the evaporator 10. As described above, the refrigerant liquid RL collected at the bottom of the evaporator 10 is sprayed toward the heat transfer tube 11 via the refrigerant line L11 by the refrigerant pump P1.

The inside of the absorption refrigerator 1 (inside of the shells 2 and 5) thus configured needs to be maintained at a high vacuum, but during operation of the absorption refrigerator 1, the inside of the absorber 20 is kept inside. However, it is not possible to avoid mixing of a gas such as air or generating hydrogen inside the absorber 20. The non-condensable gas NC other than the refrigerant gas RG, such as air and hydrogen, hinders the absorption of the refrigerant gas by the absorption solution Y, and causes a reduction in the refrigerating capacity of the absorption refrigerator 1. Based on this, the absorption refrigerator 1 is provided with a bleed device 70 for bleeding the inside of the absorber 20. Hereinafter, the bleeding device 70 will be described in detail.

FIG. 2 is a longitudinal sectional view of the bleeding device 70.
As shown in the figure, the bleeding device 70 includes a processing tank 71 configured as a cylindrical body (cylindrical body) having an upper end and a lower end closed. A partition plate 72 is fixed inside the processing tank 71, and the partition plate 72 allows the inside of the processing tank 71 to be connected to a bleed chamber 73 (upper quarter area) located on the upper side in the figure. , And a lower separation chamber 74.
A gas inlet 75 communicating with the inside of the bleeding chamber 73 is connected to the processing tank 71, and the gas inlet 75 communicates with the inside of the absorber 20 via a pipe L26 as shown in FIG. I have.

A solution receiving plate 77 is fixed in the bleeding chamber 73 of the processing tank 71. This solution receiving plate 77
Has a disk shape as shown in FIG. 3, and a plurality of notches 77a are formed on the outer periphery thereof at predetermined angular intervals (in this case, eight at 45 ° intervals). Further, a solution supply pipe 76 connected to a solution line L28 further branched from a solution line L27 branched from between the first solution pump P2 and the low-temperature heat exchanger 3 is connected to an upper portion of the processing tank 71. . The solution supply pipe 76 reaches the inside of the bleed chamber 73 through the upper lid of the processing tank 71 and the solution receiving plate 77. A plurality of holes 76a are formed in the solution supply pipe 76 so as to be located in the vicinity of the upper side of the solution receiving plate 77, and a nozzle 78 is mounted at the tip thereof.

The nozzle 78 is formed in a cylindrical shape with a bottom as shown in FIG.
6, an aperture opening 78a having a smaller area than the internal cross section is formed. As shown in FIG. 5, the aperture opening 78a has a petal shape in which a plurality of (in this case, four) circular holes are overlapped. Therefore, the edge portion of the aperture opening 78a includes a plurality of (in this case, four) projections 78b projecting inwardly at positions where the arcs overlap each other. Then, the edge 78 of the aperture opening 78a between the projections 78b.
c is formed in the shape of an arc bulging outward. Such a nozzle 78 can be simply configured, and the inner diameter r _{1 of the} circular hole, the protrusion amount r ₂ of the protrusion 78b, and the like (see FIG. 5) can be set with high accuracy. In addition, the inner diameter r _{1 of the} circular hole,
Projecting amount r ₂ of the projecting portion 78b, the device size and the absorbent solution Y
Can be arbitrarily determined according to the supply amount of the fuel cell.

A downcomer 79 extending from the center of the partition plate 72 to the lower portion of the separation chamber 74 is provided with a drinking member 80 shown in FIG. ing. As a result, the bleeding chamber 73 is
It communicates with the separation chamber 74 via the zero and the downcomer 79. The mouth member 80 has a mouth portion 81 formed in a bell mouth shape that opens with a double opening angle α, and the mouth portion 81 faces a nozzle 78 located above in the figure at a predetermined distance 1 (FIG. 2). reference). The mouthpiece member 80 is arranged such that the mouthpiece 81 projects from the upper surface of the partition plate 72 so that the absorption solution Y in the bleed chamber 73 flows from the surroundings.

On the other hand, in the separation chamber 74, as shown in FIG. 2, a gas-liquid separation member 82 is disposed at a position separated from the lower end of the downcomer 79 by a predetermined distance. In the processing tank 71,
An exhaust pipe 83 communicating with the upper part of the separation chamber 74 is connected. Further, a solution discharge pipe 84 is connected to a lower portion of the processing tank 71, and the solution discharge pipe 84 communicates with the inside of the absorber 20. The distance 1 between the nozzle 78 and the mouth part 81, the inner diameter of the downcomer 79, and the like can be arbitrarily determined according to the size of the apparatus, the supply amount of the absorbing solution Y, and the like. The shape of the mouth part 81, the opening angle α, the inner diameter d, and the like are such that the rising speed of the bubbles in the mouth part 81 is higher than the flow rate of the absorbing solution Y in the mouth part 81 (flow rate of the absorbing solution Y flowing down the downcomer 79). It is determined to be smaller.

In addition, an ejector 85 is connected to the processing tank 71 via a pipe 86 communicating with the separation chamber 74. The nozzle of the ejector 85 is provided with a first solution pump P
Solution line L branched from between 2 and low-temperature heat exchanger 3
It is connected to a solution line L29 further branched from 27 (see FIG. 1). Also, the gas inlet 87 of the ejector 85
Communicates with the inside of the condenser 50 via a pipe.

Next, the operation of the bleeding device 70 will be described.

During the operation of the absorption refrigerator 1, a slightly supercooled absorption solution Y pumped from the inside of the absorber 20 by the first refrigerant pump P1 is supplied to the solution supply pipe 76 through the pipe L2.
7, flows through L28. Part of the absorption solution Y that has flowed into the solution supply pipe 76 flows out of the hole 76a, flows on the solution receiving plate 77 toward the inner wall of the bleeding chamber 73, and is formed on the outer periphery of the solution receiving plate 77. Notch 77a
Flow down from The absorption solution Y flows down along the inner wall of the bleeding chamber 73, and during that time, the refrigerant gas RG existing in the bleeding chamber 73
Absorb.

When the absorbing solution Y that has absorbed the refrigerant gas RG reaches the partition plate 72, it flows into the mouth 81 from the periphery and overflows around the mouth 81. In order to make the absorption solution Y flow down along the inner wall of the bleeding chamber 73 uniformly, the solution receiving plate 7
It is preferable to appropriately provide a baffle plate between the cup 7 and the spout 81. Further, the liquid level of the absorbing solution Y in the bleeding chamber 73 is adjusted by the overflow pipe 88 communicating the bleeding chamber 73 and the separation chamber 74 so that the absorbing solution Y always overflows from the mouth 81. 2).

On the other hand, the absorbing solution Y that has not flowed out of the hole 76 a of the solution supply pipe 76 is jetted from the nozzle 78 toward the mouth 81 so as to collide with the absorbing solution overflowing from the mouth 81. Thereby, the nozzle 78
As shown in FIG. 7, at the collision portion between the absorbing solution Y ejected from the container and the absorbing solution Y overflowing at the mouth part 81,
An air pocket ap is formed, and bubbles (non-condensable gas NC and refrigerant gas RG) are drawn into the absorbing solution Y in the air pocket ap by a so-called plunging jet effect.
As a result, together with the fact that the refrigerant gas RG is absorbed by the absorbing solution Y in the bleeding chamber 73, the pressure in the bleeding chamber 73 decreases, and the non-condensation inside the absorber 20 through the gas inlet 75. The gas NC and the refrigerant gas RG are efficiently sucked into the extraction chamber 73.

As described above, the bleeding device 70 uses the so-called plunging jet effect (the effect of the impinging jet).
Although the inside of the absorber 20 is bleeded, conventionally, it is preferable that the absorption solution of the blanching jet type is jetted from the nozzle to the mouth part as a jet stream without disturbance to some extent quietly. Was thought. On the other hand, the present inventors have conducted intensive studies on the plunging jet type bleeding device, and as a result, the gas-liquid interface between the jet flowing from the nozzle toward the mouth and the surrounding gas (non-condensable gas and refrigerant gas) has been found. It has been found that the bleeding performance of the bleeding device is significantly improved by forming the turbulence.

Based on this, the nozzle 7 of the bleed device 70
8 is provided with a projection 78b functioning as a turbulent flow forming means at the edge of the throttle opening 78a. That is, when the absorbing solution Y supplied from the solution supply pipe 76 to the nozzle 78 is ejected from the throttle opening 78a, the absorbing solution Y is contracted and comes into contact with each projection 78b. Therefore, the core portion of the jet of the absorbing solution Y ejected from the throttle opening 78a includes:
There is no turbulence, and turbulence occurs only at the gas-liquid interface between the jet flowing from the nozzle 78 toward the mouth 81 and the surrounding gas (non-condensable gas NC and refrigerant gas RG). As a result,
Due to the plunging jet effect, the amount of air bubbles that are caught in the mouth part 81 increases dramatically.

In the nozzle 78 of the bleeding device 70, a throttle opening 78a between the projections 78b is provided.
Is formed in an arc shape bulging outward. Therefore, the absorbing solution Y is supplied to the throttle opening 7 of the nozzle 78.
Absorbing solution Y that comes into contact with each projection 78b when passing through 8a and becomes contracted, but passes in the vicinity of arc-shaped edge 78c
Diffuses outward with an outward velocity vector, and the cross-sectional area of the jet from the nozzle 78 slightly widens as it approaches the mouthpiece.

That is, in the case of the nozzle 78, four projections 78b are provided for the aperture opening 78a, and an edge 78c between the projections 78b is formed in an arc shape. Therefore, the cross-sectional shape of the jet flowing out of the nozzle 78 is substantially cross-shaped, and four depressions (turbulence) are formed when viewed from the cross-section. And
The depression formed in this manner functions as an air pocket for trapping air bubbles when colliding with the overflowing absorbing solution Y at the mouthpiece 81. Thus, if such a nozzle 78 is employed, the area in which the bubbles are trapped is further enlarged, and the amount of trapped bubbles in the mouth portion 81 can be further increased.

As described above, the absorbing solution Y in which the bubbles of the non-condensable gas NC and the refrigerant gas are engulfed in the mouth portion 81 flows down the downcomer 79 and collides with the gas-liquid separating member 82. Thus, the absorbing solution Y that has absorbed the refrigerant gas and the non-condensable gas NC
Is separated, and the absorbing solution Y is
The non-condensable gas NC is stored in the upper part in the separation chamber 74.
The non-condensable gas NC in the separation chamber 74 is discharged by a vacuum pump through an exhaust pipe 83, and the absorption solution Y in the separation chamber 74 is returned into the absorber 20 through a solution discharge pipe 84.

During operation of the absorption refrigerator 1, the ejector 8
5 is supplied with the absorbing solution Y pumped from the inside of the absorber 20 by the first refrigerant pump P1 via the pipes L27 and L29. Therefore, the ejector 85 sucks the non-condensable gas NC and the like inside the condenser 50 from the gas inlet 87 using the absorbing solution Y as a driving fluid. The non-condensable gas NC sucked by the ejector 85 is entrained in the absorbing solution Y flowing down from the nozzle portion, and is separated into gas and liquid in the separation chamber 74 of the processing tank 71. Since the internal pressure of the condenser 50 is relatively high, the non-condensable gas inside the condenser 50 can be satisfactorily extracted by such an ejector 85.

As described above, the bleeding device 70 has high bleeding performance and can be configured very simply, so that it can be configured at low cost. Therefore, in the absorption refrigerator 1, the inside of the absorber 20 is efficiently bled,
Since the non-condensable gas NC that hinders the absorption of the refrigerant gas RG can be satisfactorily removed, it is possible to improve the refrigeration capacity while suppressing an increase in overall cost.

On the other hand, as shown in FIGS. 8 and 9, a turbulent flow forming means is provided with a projection so as to come into contact with the gas-liquid interface between the jet flowing out of the nozzle opening and the surrounding refrigerant gas. Is also good. The nozzle 78A shown in FIGS. 8 and 9 includes a plurality of rods 89 made of metal or the like bent in a substantially U-shape (substantially U-shape) at predetermined angular intervals on the outer periphery of the solution supply pipe 76 (in this case, 9
(4 bodies at 0 ° intervals). As shown in FIG. 8, the tip portion 89a of the rod material 89 projects a predetermined length e from the edge of the opening 76b of the solution supply pipe 76, and functions as a projection that comes into contact with the gas-liquid interface.

Even if such a configuration is adopted, the nozzle 78
It is possible to easily disturb only the gas-liquid interface between the jet flowing from the nozzle 78A toward the mouth portion 81 and the surrounding gas without disturbing the core portion of the jet from A, and reduce the amount of air bubbles caught in the mouth portion 81. It can be effectively increased. In addition, the protrusion amount e by which the tip portion 89a (projection portion) of the bar projects from the edge of the opening 76b can be arbitrarily determined according to the device size, the supply amount of the absorbing solution Y, and the like.

FIG. 10 is a table showing experimental results comparing the bleeding performance of the bleeding device 70 according to the present invention and the conventional bleeding device. In this experiment, r ₁ and r ₂ in FIG.
= 2 mm, the nozzle 78A with the protrusion e of 1 mm in FIG. 8, and the nozzle 78A with e = 2 mm were used to compare the extraction speed with the conventional plunging jet type extraction device. As can be seen from the results shown in FIG. 10, it can be said that the bleeding device 70 using the nozzle 78 has a high bleeding speed and can exhibit extremely good bleeding performance in practical use. In addition, the bleeding device 70 using the nozzle 78A also has a higher bleeding speed than the conventional bleeding device, and can be said to be able to exhibit practically good bleeding performance.

FIG. 11 is a schematic view showing another embodiment of the bleeding device according to the present invention. Bleed device 70A shown in FIG.
A cylindrical body 90 having an inner diameter larger than the throttle opening 78a is extended from the nozzle 78B. In this case, the throttle opening 78a and the cylindrical body 90 function as turbulent flow forming means for temporally changing the cross-sectional area of the jet flowing from the nozzle 78B toward the mouthpiece 81. That is, the absorbing solution Y in the nozzle 78B becomes a contracted flow at the upstream end of the throttle opening 78a and flows into the cylindrical body 90, and repeatedly adheres and separates in a short cycle near the outlet end of the cylindrical body 90. .

As described above, if the cross-sectional area of the jet flowing from the nozzle 78B toward the mouthpiece 81 is temporally changed by the throttle opening 78a as the turbulent flow forming means and the cylindrical body 90, the outer periphery of the jet is Therefore, a plurality of depressions (turbulence) P are formed from the nozzle 78B toward the mouth part 81.
When the depression P thus formed collides with the absorbing solution Y overflowing at the mouthpiece 81,
It functions as an air pocket ap in which bubbles of the non-condensable gas NC and the refrigerant gas RG are taken in.

Therefore, even if such a configuration is adopted, it is possible to effectively increase the amount of air bubbles to be entrained in the mouth part 81. Note that, in order to cause the absorbing solution Y to repeat attachment and detachment in a short cycle near the outlet end of the cylindrical body 90, the distance h between the upstream end of the throttle opening 78a and the outlet end of the cylindrical body 90 is set. preferably the inner diameter of the iris opening 78a when the d _1, when to satisfy the h = d ₁ ~2d ₁ the relationship.

In order to change the cross-sectional area of the jet flowing from the nozzle toward the mouth portion 81 with time, the inner diameter of the throttle opening 78a is changed as shown in a nozzle 78C in FIG.
It may be enlarged in a tapered shape toward 1. In this case, the absorbing solution Y that has been contracted at the upstream end of the throttle opening 78a repeatedly adheres and separates in a short cycle at the downstream end of the throttle opening 78a. Even if such a configuration is employed, the cross-sectional area of the jet flowing from the nozzle 78C toward the mouthpiece 81 can be extremely easily changed with time.

[0055]

Since the bleeding device according to the present invention is constructed as described above, the following effects are obtained. That is, by providing a turbulent flow forming unit that forms a turbulent flow at the gas-liquid interface between the jet flowing from the nozzle toward the mouth portion and the surrounding gas in the bleeding chamber, it is possible to have a simple configuration at a low cost, In addition, it is possible to realize an extraction device having high extraction performance. In addition, if such an extraction device is provided in the absorption refrigerator, it is possible to improve the refrigeration capacity by bleeding the interior of the absorber satisfactorily, and to reduce the cost of the absorption refrigerator. Become.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an absorption refrigerator according to the present invention.

FIG. 2 is a vertical sectional view of an air extraction device provided in the absorption refrigerator shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view of a nozzle provided in the bleeding device shown in FIG.

FIG. 5 is a bottom view of the nozzle shown in FIG. 4;

FIG. 6 is a front view of a mouthpiece member provided in the air extraction device shown in FIG. 2;

FIG. 7 is a schematic diagram for explaining a bleeding mechanism in the bleeding device shown in FIG. 2;

FIG. 8 is a side view for explaining a modified example of the nozzle shown in FIGS. 4 and 5;

9 is a bottom view of the nozzle shown in FIG.

FIG. 10 is a table comparing the bleeding performance of the bleeding device according to the present invention and a conventional bleeding device.

FIG. 11 is a schematic view showing another embodiment of the bleeding device according to the present invention.

FIG. 12 is a longitudinal sectional view showing a modified example of the nozzle shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Absorption refrigerator, 10 ... Evaporator, 20 ... Absorber, 30 ...
High-pressure regenerator, 40 low-pressure regenerator, 50 condenser, 70,
70A: Bleeding device, 71: Processing tank, 72: Partition plate, 73
... extraction chamber, 74 ... separation chamber, 75 ... gas inlet, 76 ... solution supply pipe, 77 ... solution receiving plate, 78, 78A, 78B, 7
8C: nozzle, 78a: aperture opening, 78b: projection
78c: rim, 79: downcomer, 80: drinking member, 81:
Mouth part, 82: gas-liquid separating member, 83: exhaust pipe, 84: solution discharge pipe, 85: ejector, 86: piping, 87: gas inlet, 88: overflow pipe, 89: rod, 90: cylindrical body, NC ... non-condensable gas, RG ... refrigerant gas, Y ... absorption solution.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Takashi Kawakami 2-1-1, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Ryo Fukushima 2-1-1, Araimachi, Takarai City, Hyogo Prefecture No. 1 Inside the Mitsubishi Heavy Industries, Ltd. Takasago Factory

Claims (6)

[Claims] 1. An extraction device for extracting air inside an absorber of an absorption refrigerator and separating and recovering refrigerant gas and non-condensable gas, wherein an absorption solution communicating with the inside of the absorber and absorbing the refrigerant gas is provided. A bleeding chamber to be introduced, a mouth portion arranged so that the absorbing solution in the bleeding chamber flows from the surroundings, a nozzle for injecting the absorbing solution toward the mouth portion, and the bleeding through the mouth portion A separation chamber that communicates with the chamber, separates the non-condensable gas from the absorbing solution that has absorbed the refrigerant gas, and stores the absorbing solution and the non-condensable gas. A turbulence forming means for forming turbulence at a gas-liquid interface with a gas. 2. The bleeding device according to claim 1, wherein the turbulent flow forming means comprises a protrusion projecting inward from an edge of an opening of the nozzle. 3. The device according to claim 2, wherein a plurality of the protrusions are provided, and an edge of the opening is formed in an arc shape bulging outward between the protrusions. Bleed device. 4. The turbulence forming means comprises a projection arranged so as to contact a gas-liquid interface between a jet flowing out of an opening of the nozzle and a surrounding refrigerant gas. 2. The bleed device according to 1. 5. The bleeding apparatus according to claim 1, wherein the turbulence forming unit changes a sectional area of the jet flowing from the nozzle toward the mouth part with time. 6. An absorption refrigerator in which a refrigerant gas generated in an evaporator is absorbed by an absorption solution into an absorption solution by an absorber, wherein the inside of the absorber is bleed to recover the refrigerant gas and separate the non-condensable gas. A bleeding chamber that communicates with the interior of the absorber and into which an absorbing solution that absorbs refrigerant gas is introduced; and a spout that is arranged so that the absorbing solution in the bleeding chamber flows from the surroundings. And a nozzle for injecting the absorbing solution toward the mouthpiece, and communicating with the bleeding chamber through the mouthpiece to separate the non-condensable gas from the absorbing solution that has absorbed the refrigerant gas, A separating chamber for storing the absorbing solution and the non-condensable gas; and a turbulent flow forming means for forming a turbulence at a gas-liquid interface between a jet flowing from the nozzle toward the mouthpiece and a surrounding gas. Absorption refrigerator