JP3936804B2 - Absorption refrigerator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an absorption refrigerator that is used as an outdoor unit of an absorption air conditioner and cools a heat medium used for cooling operation of an air conditioner main body provided indoors, and more particularly, to an improvement in an absorption liquid spraying mechanism. .
[0002]
[Prior art]
Conventionally, as an absorption refrigerator, an outer pipe that is coaxially provided on the outer periphery of a part of a circulation pipe that circulates a heat medium and whose upper and lower ends are sealed and vertically stands, and the upper end face thereof are penetrated. And an absorbing liquid spraying pipe that is inserted into the chamber formed between the circulation pipe and the outer pipe and sprays the absorbing liquid into the chamber, and projects axially and coaxially from the inner peripheral surface of the outer pipe. A circular plate that has a plurality of spray holes at the boundary with the outer tube, receives the absorption liquid sprayed from the absorption liquid spray pipe, and sprays the absorption liquid to the inner peripheral surface of the outer pipe through the spray hole The thing provided with the saucer is known. This absorption refrigerator cools the heat medium circulating in the circulation pipe by the latent heat of evaporation of the refrigerant liquid sprayed and evaporated in the circulation pipe, and absorbs the evaporated refrigerant vapor by the absorption liquid flowing down the inner peripheral surface of the outer pipe. To do.
[0003]
[Problems to be solved by the invention]
By the way, in the above absorption chiller, the absorption liquid sprayed from the spray hole and flowing along the inner peripheral surface of the outer pipe flows almost downward due to gravity, so the entire inner peripheral surface of the outer pipe absorbs the refrigerant vapor. There is a problem that it cannot be used effectively. In addition, since the time until it flows down to the lower end of the outer tube is short, the refrigerant vapor cannot be absorbed quickly and sufficiently, and there is a problem that the cooling efficiency is lowered. Furthermore, since almost the entire absorption liquid flows in the downward direction, it is difficult for the absorption liquid to mix on the inner peripheral surface, and even if it can absorb the refrigerant vapor on the surface of the absorption liquid, it absorbs the refrigerant vapor in the part that is not in contact with the refrigerant vapor. As a result, the refrigerant flows down without being used, and there is a problem that the refrigerant absorption efficiency is poor.
[0004]
On the other hand, it is conceivable to arrange a lath net on the inner peripheral surface of the outer tube, and thereby an effect is obtained in which the absorbing liquid is spread over the inner peripheral surface through the net and the time to flow down is lengthened. . However, as shown in FIG. 5, when the spray holes 1 a,... Are arranged at random positions with respect to the mesh 6 of the lath net 5, the entire flow of the high concentration solution flowing through the lath net 5 is uneven. As a result, there is a problem that the absorbent cannot be evenly distributed on the inner peripheral surface of the outer tube.
The present invention is intended to solve the above-described problems, and an object of the present invention is to provide an absorption refrigerator that can uniformly disperse the absorbing liquid on the inner peripheral surface of the outer tube.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the structural feature of the invention according to claim 1 is that a circulation pipe through which a heat medium circulates, and a part of the circulation pipe are coaxially provided and the upper and lower ends are sealed. An outer pipe that stands upright and an absorption liquid spray pipe that penetrates the upper end surface of the outer pipe and is inserted into a room formed between the circulation pipe and the outer pipe to spread the absorbent. And an annular plate that protrudes coaxially from the inner peripheral surface of the outer tube in the axial direction, has a plurality of spray holes at equal intervals on the boundary with the outer tube, and is sprayed from the absorbent spray tube In an absorption refrigerator provided with a liquid receiver that receives the absorbed liquid and sprays the absorbed liquid on the inner peripheral surface of the outer tube through the spray hole, a lath net is placed on the inner peripheral surface of the outer tube below the liquid receiver. Attach so that each mesh of the mesh is axisymmetric with respect to the vertical line, and the number of meshes in the circumferential direction of the lath mesh is the same as or spread Lies in the fact that the number of integer multiples of.
[0006]
By configuring the invention of claim 1 as described above, when the number of meshes is equal to the number of spray holes, the absorption liquid flowing down from the spray holes provided at equal intervals in the liquid tray is the first stage of the mesh. Will be evenly distributed. Further, when the number of meshes is an integer multiple of the number of spray holes, in the first stage of the mesh, the absorbing liquid flows down every other or plural, but is distributed to the left and right at the intersection of the mesh. The absorbing solution is evenly distributed in the second to several meshes.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an outline of an absorption refrigerator that cools a cooling heat medium (hereinafter, referred to as a heat medium) of an indoor air conditioner according to the embodiment. The structure is shown.
This absorption refrigerator is an aqueous solution of lithium bromide that is a low-concentration absorbent due to the combustion heat of the burner 12 (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). A high-temperature regenerator 10 that heats the gas, and a high-temperature regenerator gas-liquid separator 14 (hereinafter simply referred to as a high-temperature separator) that separates a low-concentration solution heated by the high-temperature regenerator 10 into water vapor and an intermediate-concentration solution; A low temperature regenerator 20 that reheats the intermediate concentration solution sent from the high temperature separator 14 via the high temperature heat exchanger 17 with water vapor sent from the high temperature separator 14, and the intermediate concentration solution heated in the low temperature regenerator 20 is treated with water vapor. A low-temperature regenerator gas-liquid separator 23 (hereinafter simply referred to as a low-temperature separator), a condenser 30 for cooling and liquefying water vapor sent from the low-temperature separator 23, and a condenser 30 Sent from A double pipe unit 40 that cools the heat medium by evaporating the medium water and absorbs the water vapor by the high-concentration solution sent from the low temperature separator 23 via the low temperature heat exchanger 26, A cooling fan 50 that cools the condenser 30, and a solution pump P 1 that sends a low-concentration solution from the double-pipe unit 40 to the high-temperature regenerator 10 by raising the temperature by heat exchange in the low-temperature heat exchanger 26 and the high-temperature heat exchanger 17. Are provided as basic elements, and they are connected by piping. Each element will be described more specifically below.
[0008]
The high-temperature regenerator 10 includes a finned tube heat exchanger 13 (hereinafter referred to as a heat exchanger) that is accommodated in a housing 11 and heated by a burner 12, and an aqueous lithium bromide solution that flows in the tube. Can be efficiently heated. The high temperature separator 14 connected to the high temperature regenerator 10 via the circulation pipe K1 includes a lower limit float switch 15a for detecting the lower limit of the liquid level, an upper limit float switch 15b for detecting the upper limit of the liquid level, and an upper limit float switch. A stop float switch 15c that is provided on 15b and detects the limit liquid level is provided. When the stop float switch 15c is turned on, the heating of the burner 12 is stopped, and the operation is stopped. In the high temperature separator 14, a liquid temperature sensor 16 for detecting the temperature of the stored intermediate concentration solution is provided.
[0009]
A circulation pipe K2 for circulating the solution from the high temperature separator 14 is connected to a fin tube heat exchanger 22 (hereinafter referred to as a heat exchanger) of the low temperature regenerator 20 which will be described later via a high temperature heat exchanger 17. . 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 to 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, and keeps the liquid level of the high-temperature separator 14 at an appropriate height that enables liquid sealing. The float interlocking valve V1 is an electromagnetic valve interlocking with the float switches 15a and 15b in the high temperature separator 14, and is closed when the liquid level of the intermediate concentration solution reaches the lower limit and the lower limit float switch 15a is turned off. When the liquid level reaches the upper limit and the upper limit float switch 15b is turned on, the liquid level is opened.
[0010]
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), the branch pipe K2 branches from the circulation pipe K2 and will be described later. An overflow prevention pipe K3 which joins and is connected to is provided. The overflow prevention pipe K3 is provided with an overflow valve V2 for opening and closing the pipe line, and the overflow state of the solution in the high temperature separator 14 can be eliminated by opening the overflow valve V2.
[0011]
The low-temperature regenerator 20 has a fin tube type heat exchanger 22 accommodated in a housing 21, and a circulation pipe Q 1 that is a path for water vapor from the high-temperature separator 14 is connected to the housing 21. The lithium bromide aqueous solution flowing in the heat exchanger 22 is heated by water vapor supplied from the high temperature separator 14 through the flow pipe Q1. A circulation pipe Q2 for sending moisture accumulated in the housing 21 to the bottom of the condenser 30 is provided at the bottom of the housing 21, and the circulation pipe Q2 is provided between the low temperature regenerator 20 and the condenser 30. A valve V3 having an orifice function for providing a differential pressure is interposed.
[0012]
The low temperature separator 23 is connected to the downstream side of the heat exchanger 22 through the circulation pipe K4. The low temperature separator 23 is also provided with 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. Further, a liquid temperature sensor 25 that detects the temperature of the stored high concentration solution is provided in the low temperature separator 23. The circulation pipe K5 for circulating the solution from the low temperature separator 23 is sequentially provided with a low temperature heat exchanger 26 and an electromagnetic valve V4 for opening and closing the pipe, and the circulation pipe K5 is located downstream of the electromagnetic valve V4. Is joined to the circulation pipe K6 and connected to a distributor 48 described later. The low-temperature heat exchanger 26 performs heat exchange between the high-temperature solution from the low-temperature separator 23 flowing outside and the low-temperature low-concentration solution supplied from the solution pump P1 flowing inside.
[0013]
On the upstream side of the low-temperature heat exchanger 26 of the circulation pipe K5, there is provided an overflow prevention pipe K7 that branches from the circulation pipe K5 and joins and connects to 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, and the overflow state of the solution in the low temperature separator 23 can be eliminated by opening the overflow valve V5.
[0014]
The condenser 30 is formed by penetrating a plurality of fins by a plurality of vertically arranged cylindrical pipes. The upper end of the condenser 30 is connected to the low temperature separator 23 by a flow pipe Q3, and the water vapor sent from the low temperature separator 23 is supplied. Is cooled by blowing air from the cooling fan 50 and condensed into water. In addition, the condenser 30 is supplied with water liquefied by the low temperature regenerator 20 through the circulation pipe Q connected to the bottom. ₂ Through the water and merges with the water condensed in the condenser 30. A refrigerant tank 31 is connected to the lower part of the condenser 30 so that water condensed by the condenser 30 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. A refrigerant pump P2 is interposed in the circulation pipe Q4. The refrigerant pump P2 starts operation and supplies refrigerant water when the liquid level of the refrigerant tank 31 reaches the upper limit and the upper limit float switch 32b is turned on. When the liquid level reaches the lower limit and the lower limit float switch 32a is turned off, the operation is stopped. The liquid level control prevents the gas from entering the flow pipe Q4 and controls the concentration of the entire system. ing.
[0015]
The double pipe unit 40 includes a cold water pipe 41 that is a circulation pipe serving as a flow path of a heat medium used in an indoor air conditioner (not shown), and an outer pipe 42 that is coaxially disposed on the outer periphery of the cold water pipe 41. Has been. The chilled water pipe 41 is coaxially disposed inside the evaporation pipe section 41a and the evaporation pipe section 41a integrally connected to the inflow pipe W1 into which the heat medium flows from the indoor air conditioner side and sealed at the lower end thereof. A double tube structure is formed by the inner tube portion 41b. The inner tube portion 41b has a lower end opened near the lower end of the evaporation tube portion 41a and is fixed liquid-tightly to the evaporation tube portion 41a in a state where the upper end protrudes through the upper end of the evaporation tube portion 41a. It is integrally connected to an outflow pipe W2 through which the heat medium flows out to the indoor air conditioner. The inflow pipe W1 is provided with a cold water circulation pump Pw, 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.
[0016]
The outer tube 42 is sealed at the upper and lower ends, and a large number of cooling fins 42a are coaxially attached to the outer peripheral surface. The cold water pipe 41 is liquid-tightly fixed to the upper end surface of the outer pipe 42 with the lower end passing through the upper end face of the outer pipe 42 and being positioned at a predetermined distance from the lower end of the outer pipe 42. It is attached. Thus, a double pipe unit 40 is formed, and an evaporation absorption chamber 43 including an evaporation chamber for evaporating refrigerant water and an absorption chamber for absorbing the evaporated refrigerant is provided between the evaporation pipe portion 41a and the outer pipe 42. It is done.
[0017]
The evaporating pipe portion 41 a of the cold water pipe 41 is provided with an annular water receiving tray 44 surrounding the outer peripheral surface at a position near the upper end in the evaporation absorption chamber 43, and an evaporating pipe is provided at the inner peripheral position of the water receiving tray 44. A plurality of spray holes 44a are provided for spraying the coolant water along the portion 41a. A water spray pipe 46 distributed through a distributor 45 provided at the tip of the circulation pipe Q4 extending from the refrigerant tank 31 is disposed above the water receiving tray 44 so as to penetrate the upper surface of the outer pipe 42. ing. The evaporating pipe portion 41a uses a grooved pipe having grooves formed vertically and horizontally on the outer peripheral surface. This makes it easier for the coolant water to permeate into the outer peripheral surface, slows down the falling speed and facilitates the spread of the coolant water, and allows the coolant water flowing on the outer peripheral surface to efficiently evaporate.
[0018]
An annular solution receiver 47 is provided on the inner peripheral surface of the outer tube 42 slightly below the water receiver 44 along the inner peripheral surface. A plurality of spraying holes 47a for spraying the solution along the inner peripheral surface of is provided at equal intervals. A solution spray pipe 49 distributed through a distributor 48 provided at the end of the extended circulation pipe K6 is disposed above the solution receiving tray 47 so as to penetrate the upper surface of the outer pipe 42. The inner peripheral surface of the outer tube 42 is also subjected to shot blasting or the like to roughen the surface, so that the solution can easily penetrate into the inner peripheral surface, and the falling speed is slowed and spread easily. Although not shown, a plurality of the double pipe units 40 are provided in parallel according to the water spray pipe 46 distributed by the distributor 45 and the solution spray pipe 49 distributed by the distributor 48. .
[0019]
As shown in FIGS. 1 and 2, a lath net 60 further rounded into a cylindrical shape is coaxially inserted into the inner peripheral surface of the outer tube 42, and the position near the lower end of the outer tube 42 from directly below the solution tray 47. It is attached over. As shown in FIG. 3, the lath net 60 is formed by cutting at a predetermined position of a single metal plate and then expanding both ends, and has a shape in which a large number of rhombus-shaped nets 61 are arranged. ing. The lath net 60 is arranged so that the shorter diagonal line of the mesh 61 is directed in the vertical direction (up and down direction) and is symmetrical with respect to the vertical line, and the intersections 62 of the mesh 61 are arranged in the vertical direction. Many vertical rows are formed. Further, the number of meshes 61 is the same as the number of spray holes 47 a, and in this example, the plurality of spray holes 47 a of the solution tray 47 are arranged to be above the position of the intersection 62 of the mesh 61. ing. However, the spray hole 47a is not necessarily arranged above the position of the intersection point 62.
[0020]
The lath net 60 is attached to the outer pipe 42 by inserting the lath net 60 rounded into a cylindrical shape slightly larger than the inner diameter of the outer pipe 42 into the inner surface of the outer pipe 42 in a contracted state. It can be crimped to the inner surface of the outer tube 42 by the spreading force due to its own elasticity. The upper surface 61a of the lath net 60 is inclined in a certain direction, and when the outer tube 42 is erected vertically, the downward direction of the inclination is provided so as to face the contact surface with the outer tube 42. Since the lath net 60 is formed by the above-described simple method, it has an advantage that the manufacturing cost is low in the metal net.
[0021]
From the bottom wall of the double pipe unit 40, a circulation pipe K8 is formed which forms a solution circulation path for supplying a low concentration solution to the high temperature regenerator 10, and a solution pump P1 is provided in the middle of the circulation pipe K8. It has been. The overflow prevention pipes K7 and K3 are sequentially joined and connected on the upstream side of the solution pump P1 of the circulation pipe K8. The circulation pipe K8 is provided with a bypass pipe K9 across the solution pump P1, and the bypass pipe K9 is provided with a bypass valve V so that the flow rate of the solution can be adjusted. Further, a liquid temperature sensor 51 for detecting the temperature of the solution is provided on the upstream side 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 on the downstream side of the solution pump P1 of the circulation pipe K8, and is used for controlling the ignition of the burner 12 and the amount of gas supplied to the burner 12 by the flow rate of the low-concentration solution. . Further, an electromagnetic valve V6 for opening and closing the pipe line is provided in the vicinity of the inlet of the low-temperature heat exchanger 26. The inner pipe of the low temperature heat exchanger 26 and the inner pipe of the high temperature heat exchanger 17 are connected by a circulation pipe K10, and the inner pipe of the high temperature heat exchanger 17 is heated by the circulation pipe K11. It is connected to the exchanger 13.
[0022]
A dilution liquid circulation pipe KD branching from the circulation pipe K8 and joining to the circulation pipe K6 is provided just upstream of the solenoid valve V6 of the circulation pipe K8, and the dilution liquid circulation pipe KD is opened and closed. A dilution valve VD is interposed. The diluent circulation pipe KD is used for the dilution operation after the normal operation.
[0023]
The electrical control of the operation of the absorption chiller is performed by a control device (not shown) configured by, for example, a microcomputer including a CPU, a ROM, a RAM, a timer, an I / O, etc. The lower limit float switch 15a, the 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, liquid temperature sensor 51, flow rate sensor 52, outside air temperature sensor TG for detecting outside air temperature, water temperature The float interlock valve V1, overflow valves V2, V5, solenoid valves V4, V6, solution pump P1, refrigerant pump P2, chilled water circulation pump PW, burner 12, cooling fan 50 by the input of the water temperature sensor TW to be detected and the operation switch SW. This is done by controlling.
[0024]
Next, the operation of the embodiment configured as described above will be described in the normal operation for cooling the heat medium.
By turning on the operation switch SW of the indoor air conditioner, the cold water circulation pump PW starts supplying the heat medium to the double pipe unit 40. If the cold water temperature is lower than the set temperature (for example, 7 ° C.), There is no driving. 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 sensor 52, combustion of the burner 12 is started, and the low concentration solution is heated. Furthermore, the operation of the cooling fan 50 is also started. Thereby, the low-concentration lithium bromide solution heated by the high-temperature regenerator 10 evaporates water, and is separated into water vapor and medium-concentration solution by the high-temperature separator 14. Then, the solution circulates through a short path connecting the circulation pipes K1, K2, the overflow prevention pipe K3, and the circulation pipes K8, K10, K11, and the temperature rises rapidly.
[0025]
When the liquid temperature sensor 16 detects that the liquid temperature in the high temperature separator 14 has become equal to or higher than a set temperature (for example, 70 ° C.), the overflow valve V2 is closed and the overflow valve V5 is opened. As a result, the intermediate concentration solution of the high temperature separator 14 is cooled by the high temperature heat exchanger 17 and then heated by the heat exchanger 22 of the low temperature regenerator 20, and is separated into water vapor and a high concentration solution by the low temperature separator 23. Is done. 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 control of the high temperature separator 14 is performed by the lower limit upper limit float switches 15a and 15b and the float interlocking valve V1, and mixing of water vapor and solution is prevented.
[0026]
When the liquid temperature sensor 25 detects that the liquid temperature in the low temperature separator 23 has become equal to or higher than a set temperature (for example, 70 ° 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 by the distributor 48 via the circulation pipes K 5 and K 6, and dropped from the solution spray pipes 49 to the solution tray 47. Further, it flows down from the spray hole 47 a of the solution receiving tray 47 along the inner peripheral surface of the outer tube 42. Accordingly, heat generated when water vapor as a heat medium is absorbed by the high concentration solution is efficiently cooled by the cooling fan 50.
[0027]
Here, the high-concentration solution flowing down from the plurality of spray holes 47a of the solution tray 47 is evenly distributed to the first-stage mesh 61 (intersection 62I) of the lath net 60 immediately below, as schematically shown in FIG. In order to fall, it is distributed evenly on both sides in the circumferential direction at each intersection 62I and flows down through the net. The high-concentration solution that has flowed down is evenly distributed on both sides in the circumferential direction at the intersection 62II of the lower second mesh 61, and similarly at the intersections 62III, 62IV,. Evenly distributed on both sides in the circumferential direction. Therefore, the high-concentration solution flowing down the lath net 60 is spread evenly over the entire inner peripheral surface of the outer tube 42, and the high-concentration solution is mixed uniformly and flows down over a long period of time. A flow can be formed.
[0028]
On the other hand, water vapor from the circulation pipe Q3 of the low-temperature separator 23 is condensed and liquefied by the condenser 30, and is 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 tray 44 and flows down from the spray hole 44a of the water tray 44 along the outer peripheral surface of the evaporation pipe portion 41a. At this time, since the inside of the evaporation absorption chamber 43 is kept at a low pressure, the flowing coolant water evaporates, 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 to the inside. It returns to the indoor air conditioner via the pipe part 41b. The cooling operation of the indoor air conditioner is performed by this heat medium.
[0029]
The evaporated refrigerant vapor is efficiently absorbed by the high-concentration solution that uniformly flows along the inner peripheral surface of the outer tube 42 along the lath net 60, whereby the high-concentration solution is diluted to a low concentration, and the bottom of the outer tube 42 To the circulation pipe K8. By performing the above operation continuously, the heat medium circulating in the cold water pipe 41 is efficiently cooled, and the cooling operation of the indoor air conditioner can be maintained.
[0030]
The operation stop is performed by turning off the operation switch SW or when the operation request load is lower than the set value, the gas supply path to the burner 12 is shut off, the cooling fan 50 is stopped, and the control device 60 is further stopped. With this control, the amount of solution supplied by the solution pump P1 decreases. When the liquid temperature of the low-temperature separator 23 becomes lower than the set temperature, the solution pump P1 is stopped, the chilled water circulation pump PW of the indoor cooler is also stopped, and the absorption refrigerator is stopped.
[0031]
As described above, in the absorption refrigerator of the present embodiment, the high-concentration solution flowing down from the solution tray 47 spray hole 47a falls evenly on the mesh 61 (intersection 62) of the lath net 60 immediately below it. For this reason, each intersection 62 is equally distributed to both sides in the circumferential direction. Therefore, in the process of flowing down the high-concentration solution, the high-concentration solution is evenly spread over the entire inner peripheral surface of the outer tube 42, and the high-concentration solution is mixed uniformly and flows down over a long period of time. An even flow can be formed. As a result, the refrigerant vapor evaporated on the wall surface of the evaporation pipe portion 41a can be efficiently absorbed by the high-concentration solution flowing down, and the cooling capacity is efficiently exhibited. In addition, since the uniform flow of the high-concentration solution is obtained, the length of the outer tube 42 can be reduced to the minimum necessary length.
[0032]
In the above embodiment, the number of meshes 61 is the same as the number of spray holes 47a of the solution tray 47, but the number of meshes 61 may be twice the number of spray holes 47a. In the first stage of the mesh 61, every other solution flows down, but is distributed to the left and right at the position of the mesh intersection, and eventually the solution is evenly distributed in the second and subsequent meshes. Furthermore, the number of meshes 61 may be an arbitrary integral multiple of the number of spray holes 47a. In this case, the solution is evenly distributed from several stages of the mesh 61. Also, here, the number of the mesh 61 is equal to the number of the spray holes 47 a, and the spray holes 47 a of the solution tray 47 are not necessarily arranged above the position of the intersection 62 of the mesh 61.
[0033]
The refrigerator shown in the above embodiment is not limited to this. For example, a sensor other than a flow switch is used for detecting the liquid level, the configuration of the double pipe unit is changed, and low temperature regeneration is performed. Various modifications can be made without departing from the spirit of the present invention, such as omitting the vessel and the low-temperature separator.
[0034]
【The invention's effect】
According to the present invention, since the number of spray holes and the number of circumferential meshes of the lath net are appropriately arranged, the absorbent flowing down from the spray holes spreads evenly over the entire inner peripheral surface of the outer pipe. As the absorption liquid mixes uniformly and flows down over a long period of time, the flow becomes uniform, so that the refrigerant evaporated on the wall surface of the circulation pipe can be efficiently absorbed by the entire inner peripheral surface of the outer pipe, and the cooling capacity Is effectively exhibited. Further, by obtaining an even flow of the absorbing liquid, the length of the outer tube can be reduced to the minimum necessary length.
[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 cross-sectional view showing in detail a double pipe unit of an absorption refrigerator.
FIG. 3 is a perspective view schematically showing a lath net.
FIG. 4 is an explanatory diagram for explaining the operation of a lath network.
FIG. 5 is an explanatory diagram for explaining the operation of a lath net as a comparative example;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... High temperature regenerator, 14 ... High temperature separator, 20 ... Low temperature regenerator, 23 ... Low temperature separator, 30 ... Condenser, 40 ... Double pipe unit, 41 ... Cold water pipe, 41a ... Evaporation pipe part, 41b ... Inside Pipe portion, 42 ... outer tube, 43 ... evaporative absorption chamber, 44 ... water tray, 45 ... distributor, 46 ... water spray tube, 47 ... solution tray, 48 ... distributor, 49 ... solution spray tube, 50 ... cooling fan 60 ... Las net, 61 ... Mesh, 62 ... Intersection, K1, K2, K4, K5, K6, K8, K10, K11 ... Circulation pipe, K3, K7 ... Overflow prevention pipe, V1 ... Float interlocking valve, V2, V5 ... overflow valve, V4, V6 ... solenoid valve, P1 ... solution pump, P2 ... refrigerant pump, PW ... cold water circulation pump.

Claims (1)

A circulation pipe through which the heat medium circulates;
An outer pipe that is coaxially provided on the outer periphery of a part of the circulation pipe and is vertically installed with the upper and lower ends sealed;
An absorbing liquid spraying pipe that penetrates the upper end surface of the outer pipe and is inserted into a chamber formed between the circulation pipe and the outer pipe, and sprays the absorbing liquid into the chamber;
An annular plate that protrudes coaxially from the inner peripheral surface of the outer tube in the axial direction, and has a plurality of spray holes at equal intervals on the boundary with the outer tube, and is sprayed from the absorbent spray tube In the absorption chiller provided with a liquid receiving tray that receives the absorbed liquid and sprays the absorbed liquid to the inner peripheral surface of the outer pipe through the spray hole,
A lath net is attached to the inner peripheral surface of the outer pipe below the liquid tray, and each mesh of the lath net is axisymmetric with respect to a vertical line, and the number of meshes in the circumferential direction of the lath net is An absorption refrigerator having the same number as the spray holes or an integer multiple of the number of the spray holes.

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