JP2002098440A - Absorption type freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type freezer, in which distribution performance of uniformly distributing, by a water reception pan water, to an outer periphery of a circulation pipe is kept proper, and cooling efficiency of cooling then circulation pipe is superior. SOLUTION: An absorption type freezer comprises a cold water pipe 41, through which a heat medium is circulated, an outer pipe 42 which is provided coaxially surrounding an outer periphery side of part of the cold water pipe and which forms a vaporization absorption chamber 43 between it and the cold water pipe, a water-sprinkling pipe 46 which penetrates an upper end surface of the outer pipe and is inserted into a vaporization absorption chamber, and a water reception pan 60 mounted on the outer peripheral surface of a vaporization pipe section 41a of the cold water pipe on a lower side of the water-sprinkling pipe. The water reception pan comprises an outer cylinder section 61, a bottom plate section 62, a conical inclination section 63 inclined at an actuate angle from the inner peripheral edge coaxially and on an upper portion, and a cylindrical mounting section 64, extending to an upper portion along the outer peripheral surface of the vaporization pipe section on the outer peripheral.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator which is used as an outdoor unit of an absorption air conditioner and cools a heat medium used for cooling an air conditioner provided indoors. The present invention relates to an improvement of a refrigerant liquid receiving tray for spraying the refrigerant liquid on a circulation pipe through which a heat medium circulates.

[0002]

2. Description of the Related Art Conventionally, in this type of absorption refrigerator, as a portion for cooling a heat medium, for example, as shown in FIG. Is provided coaxially, and the upper and lower ends are sealed and vertically erected,
An outer pipe 2 forming an evaporative absorption chamber 3 is provided between the outer pipe 2 and the circulation pipe 1. A water supply pipe 4 which is inserted into the evaporation absorption chamber 3 and supplies water as a refrigerant liquid into the chamber is provided through the upper end surface of the outer pipe 2. Below the water supply pipe 4 in the evaporation absorption chamber 3, a bottomed cylindrical water receiving tray 5 circulates by brazing the inner peripheral edge of the center hole at the bottom to the outer peripheral surface of the circulation pipe 1. It is fixed to the tube 1.

As shown in detail in FIG. 7, the water receiving tray 5 includes a cylindrical outer cylindrical portion 5a and a bottom portion 5b extending in the axial direction from the lower end of the outer cylindrical portion 5a. Having a plurality of spray holes 6 at equal intervals in the circumferential direction in the vicinity of the boundary, receiving water sprayed from the water supply pipe 4, and spraying the water to the outer peripheral surface of the circulation pipe 1 through the spray holes 6. It is. That is,
This absorption refrigerator cools the heat medium flowing into the circulation pipe 1 through the inflow pipe W1 by the latent heat of water sprayed and evaporated in the circulation pipe 1, and returns the heat medium to the indoor air conditioner through the outflow pipe W2. Further, the evaporated refrigerant vapor is absorbed by the absorbing liquid flowing down the inner peripheral surface of the outer tube 1.
By uniformly distributing the water in the circumferential direction, the ratio of the wetted area on the outer peripheral surface of the circulating tube 1 is made as large as possible to be effectively used, and the evaporation efficiency is increased.

In the water receiving tray 5, the position of the spray hole 6 is close to the circulation pipe 1 so that the water from the spray hole 6 can be surely made to follow the outer peripheral surface of the circulation pipe 1.
When the entire inner peripheral edge of the water receiving tray 5 is brazed to the circulation pipe 1 over the entire circumference, the spray holes 6 may be filled with the brass. For this reason, spot brazing is performed at the inner peripheral edge portion of the water receiving tray 5 where there is no spray hole 6.

[0005]

However, in such spot brazing, the gap generated between the water receiving tray and the circulation pipe cannot be filled, so that water flows out from the gap. On the other hand, in such a structure, since it is necessary to evaporate all of the sprayed water, the flow rate of water per circumference is small, and the diameter of the spray holes 6 for distributing the water is extremely small. Therefore, even a small gap has a large effect,
The distribution performance of uniformly distributing water to the outer circumference of the circulation pipe of the water tray is reduced, and as a result, the ratio of the wet area, that is, the evaporation area on the outer peripheral surface of the circulation pipe 1 is reduced, and the cooling efficiency for cooling the circulation pipe is reduced. There was a problem of doing.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problem, and the distribution performance of uniformly distributing water to the outer periphery of a circulation pipe of a refrigerant liquid receiving tray is properly maintained, and the cooling efficiency for cooling the circulation pipe is improved. An object of the present invention is to provide an absorption refrigerator.

[0007]

According to a first aspect of the present invention, there is provided a circulating pipe through which a heat medium circulates, and a refrigerant liquid for supplying a refrigerant liquid to the circulating pipe. A supply pipe, having a bottomed cylindrical shape protruding radially outward and coaxially from the outer peripheral surface of the vertical portion of the circulation pipe, and disposed in the circumferential direction at the bottom near the boundary with the circulation pipe; A refrigerant liquid receiving tray that receives a refrigerant liquid supplied from the refrigerant liquid supply pipe and distributes the refrigerant liquid to the outer peripheral surface of the circulation pipe through the distribution hole. In the refrigerating machine, the refrigerant liquid receiving tray is provided integrally with a cylindrical mounting portion extending upward in the axial direction on an inner peripheral edge of the bottom portion.

[0008] With the construction of the first aspect of the present invention as described above, the refrigerant liquid receiving tray is provided integrally with a cylindrical mounting portion extending upward in the axial direction on the inner peripheral edge of the bottom portion. Even if there is a gap between the inner peripheral surface of the pipe and the outer peripheral surface of the circulation pipe, the refrigerant liquid does not flow out of the gap unless the water surface of the refrigerant liquid exceeds the upper end of the mounting part, so the refrigerant liquid is supplied only from the spray hole. As a result, the refrigerant liquid can be distributed to necessary positions. Further, even when the water surface of the refrigerant liquid exceeds the upper end of the mounting portion, the influence of the head on the gap becomes smaller than that of the head on the spray hole, so that the influence can be reduced.

Further, the structural features of the invention according to claim 2 include a circulation pipe through which a heat medium circulates, a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulation pipe, and an outer periphery of a vertical portion of the circulation pipe. The refrigerant having a bottomed cylindrical shape protruding radially outward and coaxially from the surface and having a plurality of spray holes arranged in a circumferential direction near a boundary of the bottom with the circulation pipe, A refrigerant liquid receiving tray that receives the refrigerant liquid supplied from the liquid supply pipe and sprays the refrigerant liquid to the outer peripheral surface of the circulation pipe through the spray hole, wherein the refrigerant liquid tray includes: A cylindrical mounting portion extending in the axial direction is integrally provided on the inner peripheral edge of the bottom portion, and is fixed to the outer peripheral surface of the circulating pipe at the mounting portion by brazing all around.

According to the second aspect of the present invention, the coolant receiving tray is provided integrally with a cylindrical mounting portion extending in the axial direction on the inner peripheral edge of the bottom portion, and the mounting portion is provided with a circulating pipe. Since it is fixed to the outer peripheral surface by brazing all around, the brazing position can be separated from the spray hole, and therefore, the problem that the spray hole is blocked by the brazing can be reliably prevented. Then, since the refrigerant liquid is fixed by brazing all around, the refrigerant liquid is supplied only from the spray hole, and the refrigerant liquid can be distributed to a required position.

According to a third aspect of the present invention, there is provided the absorption refrigerator according to the first or second aspect, wherein the predetermined length extending radially from an inner peripheral edge of a bottom portion of the refrigerant liquid receiving tray. The range is a substantially conical inclined portion that is inclined in the axial direction and upwards, and the spray hole is provided in the inclined portion. This makes it possible to make the outlet position of the spray hole closer to the outer circumferential surface of the circulation pipe, so that it is possible to prevent a problem that the refrigerant liquid falls without being sprayed on the outer circumferential face of the circulation pipe.

Further, the structural features of the invention according to claim 4 include a circulation pipe through which a heat medium circulates, a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulation pipe, and an outer periphery of a vertical portion of the circulation pipe. Refrigerant having a bottomed cylindrical shape protruding radially outward and coaxially from the surface and having a plurality of spray holes arranged in a circumferential direction at the bottom thereof, and a refrigerant supplied from the refrigerant liquid supply pipe. And a refrigerant liquid receiving tray for receiving the liquid and spraying the refrigerant liquid to the outer peripheral surface of the circulation pipe through the spray hole, wherein the refrigerant liquid receiving plate is axially disposed on an inner peripheral edge of the bottom portion. An upwardly extending cylindrical mounting portion is provided integrally, and a predetermined range extending in a radial direction from an inner peripheral edge of a bottom portion of the refrigerant liquid receiving tray has a substantially inverted conical surface shape that is oriented in the axial direction and inclined downward. And the spray hole is provided in the inclined portion.

According to the fourth aspect of the present invention, the refrigerant liquid receiving plate is provided integrally with a cylindrical mounting portion extending upward in the axial direction on the inner peripheral edge of the bottom portion. Even if there is a gap between the inner peripheral surface of the pipe and the outer peripheral surface of the circulation pipe, the refrigerant liquid does not flow out of the gap unless the water surface of the refrigerant liquid exceeds the upper end of the mounting part, so the refrigerant liquid is supplied only from the spray hole. As a result, the refrigerant liquid can be dispersed at necessary positions. Further, even when the water surface of the refrigerant liquid exceeds the upper end of the mounting portion, the influence of the head on the gap is smaller than that of the head on the spray hole, so that the influence can be reduced. Further, since the refrigerant liquid flowing out from the spray hole is sprayed to the circulation pipe along the inclined portion, there is no need to form the spray hole close to the circulation pipe, and the degree of freedom in design is high.

The structural features of the invention according to claim 5 include a circulation pipe through which a heat medium circulates, a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulation pipe, and an outer periphery of a vertical portion of the circulation pipe. Refrigerant having a bottomed cylindrical shape protruding radially outward and coaxially from the surface and having a plurality of spray holes arranged in a circumferential direction at the bottom thereof, and a refrigerant supplied from the refrigerant liquid supply pipe. And a refrigerant liquid receiving tray for receiving the liquid and spraying the refrigerant liquid to the outer peripheral surface of the circulation pipe through the spray hole, wherein the refrigerant liquid receiving plate is axially disposed on an inner peripheral edge of the bottom portion. An upwardly extending cylindrical mounting portion is provided integrally, and is fixed to the outer peripheral surface of the circulation pipe by brazing all around at the mounting portion, and is radially extending from an inner peripheral edge of a bottom portion of the refrigerant liquid receiving tray. The predetermined range extending in the axial direction is substantially inclined toward the axial direction and downward. A conical shape of the inclined portion, in the provision of the said distributing hole in the inclined portion.

According to the fifth aspect of the present invention, the coolant receiving tray is provided integrally with a cylindrical mounting portion extending in the axial direction on the inner peripheral edge of the bottom portion. Since it is fixed to the outer peripheral surface by brazing all around, the brazing position can be separated from the spray hole, and therefore, the problem that the spray hole is blocked by the brazing can be reliably prevented. Then, since the refrigerant liquid is fixed by brazing all around, the refrigerant liquid is supplied only from the spray hole, and the refrigerant liquid can be distributed to a required position. Further, since the refrigerant liquid flowing out from the spray hole is sprayed to the circulation pipe along the inclined portion, there is no need to form the spray hole close to the circulation pipe, and the degree of freedom in design is high.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cooling medium (hereinafter, referred to as a heating medium) for cooling an indoor air conditioner according to the embodiment. 1 shows a schematic configuration of an absorption refrigerator to be used.

This absorption refrigerator has an aqueous solution of lithium bromide (hereinafter simply referred to as a low-concentration solution, an intermediate-concentration solution, or a high-concentration solution depending on the concentration of lithium bromide) which is a low-concentration absorbing solution due to the heat of combustion of the burner 12. High-temperature regenerator 1 for heating
0, a high-temperature regenerator gas-liquid separator 14 for separating the low-concentration solution heated by the high-temperature regenerator 10 into steam and an intermediate-concentration solution.
(Hereinafter simply referred to as a high-temperature separator), a low-temperature regenerator 20 for reheating the intermediate-concentration solution sent from the high-temperature separator 14 via the high-temperature heat exchanger 17 with steam sent from the high-temperature separator 14, A low-temperature regenerator gas-liquid separator 23 (hereinafter simply referred to as a low-temperature separator) for separating the intermediate-concentration solution heated by the regenerator 20 into water vapor and a high-concentration solution, and cooling the water vapor sent from the low-temperature separator 23 And a condenser 30 for evaporating and cooling the heat medium by evaporating the refrigerant water sent from the condenser 30, and dispersing the water vapor by the high-concentration solution sent from the low-temperature separator 23 through the low-temperature heat exchanger 26. A double pipe unit 40 to be absorbed, a cooling fan 50 for cooling the double pipe unit 40 and the condenser 30,
The low-concentration solution is transferred from the double tube unit 40 to the low-temperature heat exchanger 26.
And a solution pump P1 which raises the temperature by heat exchange in the high-temperature heat exchanger 17 and sends it to the high-temperature regenerator 10 as basic elements, and these are connected by piping. Each element will be described more specifically below.

The high-temperature regenerator 10 has a fin-tube heat exchanger 13 (hereinafter, referred to as a heat exchanger) housed in a housing 11 and heated by a burner 12, and has a odor flowing through the tube. Lithium chloride aqueous solution can be efficiently heated. High temperature regenerator 1
0 is connected to the high-temperature separator 14 via the circulation pipe K1.
And the upper limit float switch 15b for detecting the upper limit of the liquid level
And a stop float switch 15c which is provided above the upper limit float switch 15b and detects a limit liquid level. A liquid temperature sensor 16 for detecting the temperature of the stored intermediate-concentration solution is provided in the high-temperature separator 14.

A circulation pipe K 2 for circulating the solution from the high-temperature separator 14 is connected to a low-temperature regenerator 20 through a high-temperature heat exchanger 17.
Is connected to a fin tube type heat exchanger 22 (hereinafter, referred to as a heat exchanger). The high-temperature heat exchanger 17 exchanges heat between the high-temperature solution from the high-temperature separator 14 flowing on the outside (on the drawing) and the low-temperature low-concentration solution supplied from the solution pump P1 flowing on the inside (on the drawing). Is what you do. In the circulation pipe K2 between the high-temperature heat exchanger 17 and the low-temperature regenerator 20, an orifice 18 and a float interlocking valve V1 are provided in parallel. The orifice 18 reduces the pressure of the solution passing therethrough to maintain the liquid level of the high-temperature separator 14 at an appropriate height such that a liquid seal can be formed. The float interlocking valve V1 is connected to the float switch 1 in the high temperature separator 14.
5a, 15b, which is an electromagnetic valve interlocked with the lower limit float switch 15a when the liquid level of the intermediate concentration solution reaches the lower limit.
Is closed when is turned off, and is opened when the liquid level reaches the upper limit and the upper limit float switch 15b is turned on.

On the upstream side of the high-temperature heat exchanger 17 of the circulation pipe K2 (hereinafter, the side on which the solution flows is referred to as the upstream side, and the side on which the solution flows is referred to as the downstream side). Overflow prevention pipe K3 that joins and connects with circulation pipe K8
Is provided. The overflow prevention pipe K3 is provided with an overflow valve V2 for opening and closing the pipeline.
The overflow state of the solution in the high temperature separator 14 can be eliminated by opening the overflow valve V2.

The low-temperature regenerator 20 has a fin-tube heat exchanger 22 housed in a housing 21. The housing 21 is connected to a flow pipe Q1 which is a path for steam from the high-temperature separator 14. I have. And the heat exchanger 22
The aqueous lithium bromide solution flowing through the inside is heated by steam supplied from the high temperature separator 14 through the flow pipe Q1. Also, at the bottom of the housing 21,
A flow pipe Q2 is provided for sending water accumulated inside the housing 21 to the bottom of the condenser 30. The flow pipe Q2 has an orifice function for generating a pressure difference between the low-temperature regenerator 20 and the condenser 30. A valve V3 is provided.

The low temperature separator 23 is connected to the downstream side of the heat exchanger 22 via a circulation pipe K4. Low temperature separator 23
Also provided are a lower limit float switch 24a, an upper limit float switch 24b, and a stop float switch 24c, which are respectively used for liquid level control. In addition, a liquid temperature sensor 25 that detects the temperature of the stored high-concentration solution is provided in the low-temperature separator 23. Low temperature separator 23
A low-temperature heat exchanger 26 and a solenoid valve V4 for opening and closing a pipe line are sequentially interposed in the circulation pipe K5 for circulating the solution from the tank, and the circulation pipe K5 is provided downstream of the solenoid valve V4 in the circulation pipe K6. And is connected to a distributor 48 described later. The low-temperature heat exchanger 26 exchanges heat between the high-temperature solution flowing from the low-temperature separator 23 flowing outside and the low-temperature low-concentration solution supplied from the solution pump P1 flowing inside.

On the upstream side of the circulation pipe K5 at the low temperature heat exchanger 26, there is provided an overflow prevention pipe K7 which branches off from the circulation pipe K5 and joins with a circulation pipe K8 described later.
The overflow prevention pipe K7 is provided with an overflow valve V5 for opening and closing the pipe line.
By opening 5, the overflow state of the solution in the low-temperature separator 23 can be eliminated.

The condenser 30 is formed by penetrating a plurality of fins by a plurality of cylindrical pipes vertically erected.
The upper end is connected to the low-temperature separator 23 by the flow pipe Q3, and the water vapor sent from the low-temperature separator 23 is cooled by blowing air from a cooling fan 50 to be described later and condensed into water.
Water liquefied by the low-temperature regenerator 20 flows into the condenser 30 through the flow pipe Q2 connected to the bottom, and
Merges with the water condensed in the condenser 30. A refrigerant tank 31 is connected to a lower part of the condenser 30 and the condenser 3
The water condensed at 0 flows in and is temporarily stored. In the refrigerant tank 31, a lower limit float switch 32a for detecting the lower limit of the liquid level and an upper limit float switch 32b for detecting the upper limit of the liquid level are provided.
A circulation pipe Q4 extends from the lower end of the refrigerant tank 31, and is connected to a distributor 45 described later. Distribution pipe Q
4 is provided with a refrigerant pump P2.
2 means that the operation starts when the liquid level of the refrigerant tank 31 reaches the upper limit and the upper limit float switch 32b is turned on to supply the refrigerant water, and the liquid level reaches the lower limit and the lower limit float switch 32a is turned off. The operation is stopped by controlling the liquid level to prevent the gas from entering the flow pipe Q4 and to control the concentration of the entire system.

As shown in FIGS. 1 and 2, the double-pipe unit 40 has a chilled water pipe 41 serving as a circulation pipe of a heat medium used in an indoor air conditioner (not shown), and is coaxially arranged on the outer periphery thereof. The outer tube 42 is provided vertically. The chilled water pipe 41 is integrally connected to an inflow pipe W1 through which a heat medium flows from the indoor air cooler side, and has an evaporating pipe section 41a whose lower end is sealed, and is disposed coaxially inside the evaporating pipe section 41a. The inner pipe portion 41b forms a double pipe structure.
The evaporating tube portion 41a has a hydrophilic treatment applied to the outer peripheral surface of the portion arranged in the outer tube 42. Thereby, the refrigerant water can be easily spread, and the ratio of the wet area on the outer peripheral surface of the evaporating tube portion 41a can be increased. Further, by forming the liquid film thinly, the thermal resistance can be reduced and the evaporation efficiency can be increased, and the scattering of the coolant water due to bumping can be prevented.

The lower end of the inner pipe portion 41b is
1a is opened near the lower end, and the upper end
A liquid-tight fixation is made to the evaporating tube portion 41a in a state of protruding through the upper end of a, and the end is integrally connected to an outflow tube W2 through which the heat medium flows out to the indoor cooling machine. In addition, a cold water circulation pump Pw is interposed in the inflow pipe W1, and the outflow pipe W2
Is provided with a water temperature sensor Tw for detecting the temperature of the heat medium circulating in the pipe.

The upper and lower ends of the outer tube 42 are sealed, and a number of cooling fins 42a are coaxially mounted on the outer peripheral surface. Then, the chilled water pipe 41 is fixed to the upper end face of the outer pipe 42 in a liquid-tight manner, with the lower end located at a position separated from the lower end of the outer pipe 42 by a predetermined distance through the upper end face of the outer pipe 42. It is attached. Thereby, the double tube unit 4
0 is formed, and between the evaporating pipe portion 41a and the outer tube 42, an evaporating and absorbing chamber 43 is provided which includes an evaporating chamber for evaporating the refrigerant water and an absorbing chamber for absorbing the evaporated refrigerant.

In the evaporating tube portion 41 a of the cold water tube 41, a bottomed cylindrical water receiving tray 60, which is a refrigerant liquid receiving tray, is provided at a position near the upper end in the evaporating absorption chamber 43, surrounding the outer peripheral surface. As shown in detail in FIGS. 3 (a) and 3 (b),
An outer cylindrical portion 61, an annular bottom plate portion 62 that forms a part of a bottom portion extending in the axial direction at a lower end thereof, and an evaporating tube portion inclined at an acute angle in an axial direction and upward from an inner peripheral edge of the bottom plate portion 62. Conical inclined portion 63 forming a part of the bottom extending to the outer peripheral surface of 41a
And a cylindrical mounting portion 64 slightly extending upward along the outer peripheral surface of the evaporating tube portion 41a at the inner peripheral edge of the inclined portion 63. At a position near the mounting portion 64 of the inclined portion 63,
A plurality of spray holes 65 for spraying the coolant water along the evaporating pipe portion 41a are provided at equal intervals in the circumferential direction.
With such a structure, when the coolant water is supplied to the water tray 60, the coolant water accumulates in the water tray 60 and is evenly sprayed from the respective spray holes 65, so that the water level in the water tray 60 is maintained. Is done.

The water receiving tray 60 is fixed to the outer peripheral surface of the evaporating tube portion 41a at the upper end of the mounting portion 64 by brazing.
The brazing is performed by melting the brazing material by heating of the burner, or by brazing in a furnace in which an annular brazing material is set at the upper end of the mounting portion 64 and melted through a heating furnace. Therefore, the brazing position is
5, it is possible to reliably prevent the problem that the spray hole 65 is blocked by brazing. In addition,
In the case of FIG. 3 (a), the upper end of the mounting portion 64 may come to a position below the surface of the coolant water, so it is necessary to braze the entire circumference. In the case of FIG. 3 (b), the upper end of the mounting portion 64 Does not fall below the surface of the coolant water, so it is not necessary to perform brazing on the entire circumference, and spot brazing may be performed partially.
A water spray pipe 46 distributed through a distributor 45 provided at the end of the flow pipe Q4 extending from the refrigerant tank 31 is disposed above the water receiving tray 60 so as to penetrate the upper surface of the outer pipe 42. ing.

An annular solution tray 47 is provided on the inner peripheral surface of the outer tube 42 slightly below the water tray 60 along the inner peripheral surface. A plurality of spray holes 47a for spraying the solution along the inner peripheral surface of the nozzle 42
Are provided at equal intervals. At the top of the solution pan 47,
A solution spraying pipe 49 distributed via a distributor 48 provided at the end of the extended circulation pipe K6 is arranged to penetrate the upper surface of the outer pipe 42. The inner peripheral surface of the outer tube 42 is subjected to a shot blasting process or the like to roughen the surface, so that the solution easily penetrates into the inner peripheral surface, thereby reducing the falling speed and facilitating the spread. A lath net rounded into a cylindrical shape is further coaxially inserted into the inner peripheral surface of the outer tube 42, and a solution pan 47 is inserted.
May be attached from just below to the position near the lower end of the outer tube 42, whereby the falling speed of the solution can be further reduced and the solution can be easily spread.

Although not shown, the double tube unit 40
Corresponds to the water spray pipe 46 distributed by the distributor 45 and the solution spray pipe 49 distributed by the distributor 48,
A plurality are provided in parallel. Also, the cold water path of each double tube unit is connected to a series.

From the bottom wall of the double pipe unit 40, a circulation pipe K8 for forming a solution circulation path for supplying a low-concentration solution to the high-temperature regenerator 10 is extended, and a solution pump is provided in the middle of the circulation pipe K8. P1 is provided. On the upstream side of the solution pump P1 of the circulation pipe K8, the overflow prevention pipes K7, K
3 are sequentially joined. The circulation pipe K8 is provided with a bypass pipe K9 with the solution pump P1 interposed therebetween, and the bypass pipe K9 is provided with a bypass valve V so that the flow rate of the solution can be adjusted. A liquid temperature sensor 51 for detecting the temperature of the solution is provided upstream of the solution pump P1 of the circulation pipe K8, and is used for normal operation and dilution operation control. A flow rate sensor 52 is provided downstream of the solution pump P1 of the circulation pipe K8, and is used for controlling the ignition of the burner 12 and controlling the amount of gas supplied to the burner 12 by the flow rate of the low-concentration solution. . An electromagnetic valve V6 for opening and closing the pipeline is provided near the inlet of the low-temperature heat exchanger 26. Low temperature heat exchanger 26 and high temperature heat exchanger 17
Are connected by a circulation pipe K10, and the inner pipe of the high-temperature heat exchanger 17 is connected to the heat exchanger 13 of the high-temperature regenerator 10 by a circulation pipe K11.

A diluent circulation pipe KD branching from the circulation pipe K8 and joining the circulation pipe K6 is provided slightly upstream of the solenoid valve V6 of the circulation pipe K8. Is provided with a dilution valve VD for opening and closing the valve. The diluent circulation pipe KD is used for dilution operation after normal operation.

The electrical control of the operation of the absorption refrigerator is performed by a control unit (not shown) constituted by a microcomputer including a CPU, a ROM, a RAM, a timer, an I / O, and the like. 1
5a, upper limit float switch 15b, stop float switch 15c, liquid temperature sensor 16, liquid temperature sensor 25, lower limit float switch 32a, upper limit float switch 32b,
A liquid temperature sensor 51, a flow rate sensor 52, an outside air temperature sensor TG,
By the input of the water temperature sensor TW for detecting the water temperature and the operation switch SW, the above-mentioned float interlocking valve V1, overflow valves V2, V5, solenoid valves V4, V6, solution pump P1, refrigerant pump P2, cold water circulation pump PW, burner 12, cooling This is performed by controlling the fan 50.

Next, the operation of the embodiment configured as described above will be described for a normal operation for cooling the heat medium. When the operation switch SW of the indoor air conditioner is turned on, the chilled water circulation pump PW starts supplying the heat medium to the double pipe unit 40.
C), the refrigerator is not operated. When the chilled water temperature exceeds the set temperature, the solenoid valves V4 and V6 and the overflow valve V2 are opened, and the solution pump P1 starts operating. When the flow of the solution is confirmed by the flow rate sensor 52, the combustion of the burner 12 is started, and the low concentration solution is heated. Further, the operation of the cooling fan 50 is started. As a result, the low-concentration lithium bromide solution heated by the high-temperature regenerator 10 evaporates, and is separated into water vapor and a medium-concentration solution by the high-temperature separator 14. And the circulation pipe K1
, K2, overflow prevention pipe K3, circulation pipe K8, K1
The solution circulates through a short path connecting 0 and K11, and its temperature rises rapidly.

The liquid temperature sensor 1 detects that the liquid temperature in the high-temperature separator 14 has become equal to or higher than a set temperature (for example, 50 ° C.).
6, the overflow valve V2 is closed and the overflow valve V5 is opened. As a result, the intermediate-concentration solution in the high-temperature separator 14 is
After being cooled in 7, the mixture is heated in the heat exchanger 22 of the low-temperature regenerator 20, and separated into steam and a high-concentration solution in the low-temperature separator 23. Then, the temperature of the solution is rapidly increased through a short path connecting the circulation pipes K1, K2, K4, K5, the overflow prevention pipe K7, and the circulation pipes K8, K10, K11.
Here, the liquid level of the high temperature separator 14 is controlled by the lower and upper limit float switches 15a and 15b and the float interlocking valve V1, and the mixing of the steam and the solution is prevented.

When the liquid temperature sensor 25 detects that the liquid temperature in the low-temperature separator 23 has exceeded a set temperature (for example, 50 ° C.), the overflow valve V5 is closed.
As a result, the high-concentration solution in the low-temperature separator 23 is cooled by passing through the low-temperature heat exchanger 26, distributed through the circulation pipes K5 and K6, and distributed by the distributor 48, and from the respective solution spray pipes 49 to the solution receiving tray 4.
7 and further flows down along the inner peripheral surface of the outer tube 42 from the spray hole 47 a of the solution receiving tray 47. Along with this, the heat generated when water vapor as a heat medium is absorbed by the high concentration solution,
The cooling is efficiently performed by the cooling fan 50.

On the other hand, steam from the flow pipe Q3 of the low-temperature separator 23 is condensed and liquefied in the condenser 30 and supplied to the distributor 45 by the refrigerant pump P2 through the refrigerant tank 31. The refrigerant water distributed by the distributor 45 is dropped from the water spray pipe 46 to the water receiving tray 60, and is surely sprayed from the spray holes 65 of the water receiving tray 60 toward the outer peripheral surface of the evaporating pipe part 41a. The sprayed water flows down along the outer peripheral surface of the evaporating tube portion 41a. At this time, since the inside of the evaporation absorption chamber 43 is maintained at a low pressure, the flowing coolant water evaporates, the evaporation heat of the evaporation pipe portion 41a is cooled by the latent heat of evaporation, and the heat medium flowing into the evaporation pipe portion 41a is cooled and cooled. The air is returned to the indoor cooler via the pipe portion 41b. The cooling operation of the indoor air conditioner is performed by the cooled heat medium.

The evaporated refrigerant vapor is efficiently absorbed by the high-concentration solution flowing down uniformly along the inner peripheral surface of the outer tube 42, whereby the high-concentration solution is diluted to a low concentration, and from the bottom of the outer tube 42. It is discharged to the circulation pipe K8. By performing the above operations continuously, the heat medium circulating in the chilled water pipe 41 is efficiently cooled, and the cooling operation of the indoor air conditioner can be maintained.

The operation is stopped by turning off the operation switch SW or when the required operation load falls below a set value, and the gas supply path to the burner 12 is shut off.
At the same time, the cooling fan 50 is stopped, and the amount of the solution supplied by the solution pump P1 is reduced by the control of the controller.
Then, when the liquid temperature of the low-temperature separator 23 becomes lower than the set temperature, the solution pump P1 is stopped, and the chilled water circulation pump PW of the indoor air conditioner is also stopped, and the operation of the absorption refrigerator is stopped.

As described above, in the absorption refrigerator of the present embodiment, the mounting portion 64 is formed on the inner peripheral side of the spray hole 65 of the water receiving tray 60, and the upper end of the mounting portion 64 is brazed. Thus, it is possible to braze the entire circumference without clogging the spray hole 65, and the evaporating pipe portion 41a and the water receiving pan 6
0 can be filled, water can be evenly sprayed from the spray holes 65, and the distribution performance of uniformly distributing water to the outer periphery of the evaporating tube portion 41a of the water receiving tray 60 is properly secured. You. In particular, if the length of the mounting portion 64 in the axial direction is short, it can be easily formed by press working. On the other hand, when the length of the mounting portion 64 in the axial direction is long and the upper end of the mounting portion 64 does not fall below the surface of the coolant, the same distribution performance can be obtained even by spot brazing. Is not hidden by the outer cylindrical portion 61, so that brazing can be easily performed. Further, a predetermined range in the radial direction from the inner peripheral edge of the bottom plate portion 62 of the water receiving tray 60 is a conical inclined portion 63 inclined in the axial direction and upward. The provision of the spray holes 65
Can be made closer to the outer peripheral surface of the evaporating tube portion 41a, so that it is possible to prevent a problem that the refrigerant water that has come out of the spray hole 65 falls without being sprayed on the outer peripheral surface of the evaporating tube portion 41a. Due to these effects, the coolant water supplied to the water receiving tray 60 can be evaporated by efficiently using the entire circumference of the evaporating pipe portion 41a, so that the cooling efficiency can be increased. Furthermore, the cooling water pipe 41 is improved by improving the cooling efficiency.
In addition, the length of the outer tube 42 can be reduced, and the size and weight of the refrigerator can be reduced.

Next, a second embodiment of the water receiving tray will be described. In the present embodiment, as shown in FIG.
The water receiving tray 70 has an outer cylindrical portion 71, an annular bottom 72 extending axially at the lower end to the outer peripheral surface of the evaporating tube 41 a, and an inner peripheral edge of the bottom 72 along the outer peripheral surface of the evaporating tube 41 a. And a cylindrical mounting portion 73 slightly extending downwardly is provided integrally with the evaporating tube portion 4 at a position near the mounting portion 73 on the bottom portion 72.
A plurality of spray holes 74 for spraying the coolant water along 1a
Are provided at equal intervals in the circumferential direction. The water tray 70
The lower end of the mounting portion 73 is fixed to the outer peripheral surface of the evaporating tube portion 41a by brazing. In this case, the brazing position is
Since it is below the level of the coolant water, brazing must be performed over the entire circumference of the evaporating tube 41a.

In the second embodiment configured as described above, similarly to the water receiving tray 60 in the first embodiment, it is possible to braze the entire circumference without clogging the spray hole 74, and to evaporate. Since the gap generated between the pipe portion 41a and the water receiving tray 70 can be filled, the coolant water from the spray holes 74 is uniformly sprayed on the evaporating tube portion 41a. As a result, the distribution performance of uniformly distributing water to the outer periphery of the evaporating tube portion 41a of the water receiving tray 70 is properly secured, and the cooling efficiency of cooling the evaporating tube portion 41a due to the evaporation of water is increased. Also, even when the axial length of the mounting portion 73 is shorter than the axial length of the outer cylindrical portion 71, the lower end of the mounting portion 73 at the brazing position may be covered by the outer cylindrical portion 71. Therefore, brazing can be easily performed.

Next, a third embodiment of the water receiving tray will be described. In the present embodiment, as shown in FIG.
The water receiving tray 80 includes an outer cylindrical portion 81, an inverted conical bottom 82 extending axially and downwardly at the lower end thereof to the outer peripheral surface of the evaporating tube 41 a, and evaporating at an inner peripheral edge of the bottom 82. Pipe part 4
1a is provided integrally with a cylindrical mounting portion 83 extending upward along the outer peripheral surface.
Are provided at equal intervals in the circumferential direction. The water receiving tray 80 is fixed at the upper end of the mounting portion 83 to the outer peripheral surface of the evaporating tube portion 41a by brazing. In the water receiving tray 80, the water flowing out of the spray hole 84 travels along the inclined bottom part 82 and the evaporation pipe part 4.
1a.

In the third embodiment constructed as described above, similarly to the water receiving tray 60 in the first embodiment, the disadvantage that the spray hole 84 is blocked by brazing can be prevented. The water from 84 travels along the bottom 82 and is uniformly scattered on the outer peripheral surface of the evaporating tube 41a. As a result, the distribution performance of uniformly distributing water to the outer periphery of the evaporating tube portion 41a of the water receiving tray 80 is properly secured, and the cooling efficiency of cooling the evaporating tube portion 41a due to the evaporation of water is increased. In addition, the refrigerant water from the spray hole 84 is directly transferred to the evaporating pipe section 4.
Since there is no need to make contact with the outer peripheral surface 1a, the positioning of the spray hole 84 can be relatively freely performed, which is advantageous in design.

Note that the refrigerator shown in the above embodiment is not limited to this. For example, a sensor other than a flow switch may be used for detecting the liquid level, and the configuration of the double tube unit may be changed. Various changes can be made without departing from the spirit of the present invention, such as omitting a low-temperature regenerator and a low-temperature separator. Further, in the present embodiment, the inner peripheral edge of the water tray is extended to form a mounting portion, thereby preventing the coolant water from flowing out from the gap, but this idea is not limited to the application on the evaporation side. ,
For example, it can be applied to the absorption side. On the absorption side, the same effect can be obtained by extending the outer peripheral edge of the solution receiving tray 47 along the inner peripheral edge of the outer tube 42 to form a mounting portion.

[0047]

According to the first aspect of the present invention, the refrigerant liquid can be distributed from the spray hole to a required position. As a result, the refrigerant liquid can be efficiently spread over the entire outer peripheral surface of the circulation pipe, the length of the circulation pipe and the outer pipe can be shortened, and the size and weight of the refrigerator can be reduced. . Further, since there is no need to fill the gap between the refrigerant liquid receiving tray and the circulation pipe, the manufacturing cost can be reduced.

According to the second aspect of the present invention, the refrigerant liquid can be distributed from the spray hole to a required position. As a result, the refrigerant liquid can be efficiently spread over the entire outer peripheral surface of the circulation pipe, the length of the circulation pipe and the outer pipe can be shortened, and the size and weight of the refrigerator can be reduced. . Further, the length of the mounting portion can be designed within a range in which the spray hole is not clogged by brazing all around, so that the refrigerant liquid receiving tray can be manufactured at low cost by press working or the like. Further, by reliably spraying the refrigerant liquid on the outer peripheral surface of the circulation pipe, it is possible to prevent the performance from deteriorating (the effect of the invention of claim 3).

Further, according to the fourth aspect of the present invention, the refrigerant liquid can be distributed to a required position from the spray hole. As a result, the refrigerant liquid can be efficiently spread over the entire outer peripheral surface of the circulation pipe, the length of the circulation pipe and the outer pipe can be shortened, and the size and weight of the refrigerator can be reduced. . Further, since there is no need to fill the gap between the refrigerant liquid receiving tray and the circulation pipe, the manufacturing cost can be reduced.
In addition, since it is not necessary to form the position of the spray hole close to the circulation pipe, the manufacturing cost can be reduced.

According to the fifth aspect of the present invention, the refrigerant liquid can be distributed from the spray hole to a required position. As a result, the refrigerant liquid can be efficiently spread over the entire outer peripheral surface of the circulation pipe, the length of the circulation pipe and the outer pipe can be shortened, and the size and weight of the refrigerator can be reduced. . Further, the length of the mounting portion can be designed to be short as long as the spray hole is not blocked by brazing all around, so that the refrigerant liquid receiving tray can be manufactured at low cost by press working or the like. In addition, since there is no need to form the position of the spray hole close to the circulation pipe, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a double tube unit of the absorption refrigerator in detail.

FIG. 3 is a cross-sectional view schematically showing a water tray of the absorption refrigerator.

FIG. 4 is a sectional view schematically showing a water receiving tray according to a second embodiment.

FIG. 5 is a cross-sectional view schematically showing a water tray according to a third embodiment.

FIG. 6 is a cross-sectional view showing in detail a conventional double-pipe unit of an absorption refrigerator.

FIG. 7 is a cross-sectional view schematically showing a conventional water receiving tray.

[Explanation of symbols]

40: Double tube unit, 41: Cold water tube, 41a: Evaporation tube, 41b: Inner tube, 42: Outer tube, 43: Evaporation absorption chamber, 45: Distributor, 46: Water spray tube, 47: Solution tray ,
48: distributor, 49: solution spray tube, 50: cooling fan,
Reference numeral 60 denotes a water receiving tray, 61 denotes an outer cylinder portion, 62 denotes a bottom plate portion, 63 denotes an inclined portion, 64 denotes a mounting portion, 65 denotes a spray hole, and 70 denotes a water receiving tray.
DESCRIPTION OF SYMBOLS 1 ... outer cylinder part, 72 ... bottom part, 73 ... mounting part, 74 ... spraying hole, 80 ... water receiving tray, 81 ... outer cylinder part, 82 ... bottom part, 83 ...
Attachment part, 84 ... spray hole.

Claims (5)

[Claims] A circulating pipe through which a heat medium circulates; a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulating pipe; and a coaxial protruding radially outward from a vertical outer peripheral surface of the circulating pipe. It has a bottomed cylindrical shape, has a plurality of spray holes arranged in the circumferential direction in the vicinity of the boundary of the bottom with the circulation pipe, receives the refrigerant liquid supplied from the refrigerant liquid supply pipe, A refrigerant liquid receiving tray for distributing the refrigerant liquid to the outer peripheral surface of the circulation pipe through the distribution hole, wherein the refrigerant liquid receiving tray has a cylindrical shape extending axially upward to an inner peripheral edge of the bottom portion. An absorption refrigerator having a mounting portion provided integrally. 2. A circulating pipe through which a heat medium circulates; a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulating pipe; and a coaxial protruding radially outward from a vertical part outer peripheral surface of the circulating pipe. It has a bottomed cylindrical shape, has a plurality of spray holes arranged in the circumferential direction in the vicinity of the boundary of the bottom with the circulation pipe, receives the refrigerant liquid supplied from the refrigerant liquid supply pipe, A refrigerant liquid receiving plate for distributing the refrigerant liquid to the outer peripheral surface of the circulation pipe through the distribution hole, wherein the refrigerant liquid receiving plate has a cylindrical mounting extending in an axial direction on an inner peripheral edge of the bottom portion. An absorption refrigerator having an integral part and being fixed to the outer peripheral surface of the circulating tube at the mounting part by brazing all around. 3. A predetermined range extending in a radial direction from an inner peripheral edge of a bottom portion of the coolant liquid receiving tray is defined as a substantially conical inclined portion that is directed in an axial direction and is inclined upward. The absorption refrigerator according to claim 1 or 2, wherein a spray hole is provided. 4. A circulating pipe through which a heat medium circulates, a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulating pipe, and radially outwardly and coaxially protruding from an outer peripheral surface of a vertical portion of the circulating pipe. It has a bottomed cylindrical shape, has a plurality of spray holes arranged in the circumferential direction at the bottom thereof, receives the coolant liquid supplied from the coolant liquid supply pipe, and passes the coolant liquid through the spray hole. In the absorption refrigerator provided with a refrigerant liquid tray that is sprayed on the outer peripheral surface of the circulation pipe, the refrigerant liquid tray is provided integrally with a cylindrical mounting portion that extends axially upward on an inner peripheral edge of the bottom portion, A predetermined range extending in the radial direction from the inner peripheral edge of the bottom of the refrigerant liquid receiving tray is a substantially inverted conical surface-shaped inclined portion that is oriented in the axial direction and inclined downward, and the spray hole is formed in the inclined portion. An absorption type refrigerator characterized by being provided. 5. A circulating pipe through which a heat medium circulates, a refrigerant liquid supply pipe for supplying a refrigerant liquid to the circulating pipe, and radially outwardly and coaxially protruding from a vertical outer peripheral surface of the circulating pipe. It has a bottomed cylindrical shape, has a plurality of spray holes arranged in the circumferential direction at the bottom thereof, receives the coolant liquid supplied from the coolant liquid supply pipe, and passes the coolant liquid through the spray hole. In the absorption type refrigerator provided with a refrigerant liquid receiving tray sprayed on the outer peripheral surface of the circulation pipe, the refrigerant liquid receiving tray is provided integrally with a cylindrical mounting portion extending upward in the axial direction on an inner peripheral edge of the bottom portion. A predetermined range extending radially from the inner peripheral edge of the bottom of the refrigerant liquid receiving tray is fixed to the outer peripheral surface of the circulation pipe at the attachment portion by brazing all around, and is directed in the axial direction and downward. A substantially inverted conical inclined surface that is inclined toward the Absorption chiller which is characterized in that a hole.