RU2205336C2 - Method of generation of cold in absorption diffusion refrigerating unit and device for realization of this method - Google Patents

Abstract

FIELD: refrigerating engineering; refrigerating units. SUBSTANCE: solution is fed to surface of elements located in absorber by means of steam lift pumps connected in series by steam. Solution may be also fed to absorber mounted separately and connected in series by solution. Proposed method makes it possible to obtain strong solution of maximum concentration in the course of absorption. EFFECT: simplified construction and facilitated procedure; reduced overall dimensions and usage of metal. 16 cl, 3 dwg

Description

 The invention relates to household refrigeration and can be widely used in domestic refrigerators equipped with absorption-diffusion refrigeration units (ADHA).

 The known method by which ADHA works (1), containing a boiler installed sequentially in a solution, an absorber, a heat exchanger-regenerator and a heating jacket of a boiler, as well as a rectifier, condenser, high and low temperature evaporators, gas heat exchanger, hard liquor receiver and pipelines.

 The disadvantage of this method of operation ADHA of this design is the low refrigerating capacity.

 A known method of operation of ADHA (2) is a prototype by evaporating refrigerant from a strong solution supplied from a receiver in a boiler, condensing refrigerant vapor in a condenser, evaporating liquid refrigerant into an inert gas medium in an evaporator, and then transporting a cold vapor-gas mixture to an absorber. At the same time, a strong solution from the absorber is collected in a container and sent through a water trap to the riser pipe of the steam lift pump, which works with the help of a pair of refrigerant obtained in the boiler and brought in by the steam line to form a water trap to the riser to supply the two-phase mixture to the receiver and then collect the strong solution in the receiver at the level of the boiling solution in the boiler, which is higher than the level of discharge of the weak solution into the absorber, moreover, the refrigerant vapor of the receiver is then sent to the condenser.

 A disadvantage of the known method of operation of ADHA is its low thermodynamic efficiency due to the low intensity of heat and mass transfer processes occurring in the absorber.

 Known ADHA (2) is a prototype containing a boiler body, steam pipe, electric heater, absorber, receiver and heat exchanger-regenerator. The ADXA boiler is equipped with two cylinders, the inner cylinder being connected to the housing, made with a lower blanked end and an electric heater placed in it, and the external cylinder made with an open upper end located at the level of a strong solution in the receiver, but above the level of supply of a weak solution to the absorber. The gap between the inner and outer cylinders is connected by a steam line with the formation of a water seal to the lift pipe of the lift pump, the upper end of which is brought into the steam cavity of the receiver, and the lower end is connected with the formation of a water seal to the tank made from the bottom of the absorber.

 A disadvantage of the known ADHA (2) is the low refrigerating capacity due to the low efficiency of the absorber.

 The objective of the invention is to obtain in the process of absorption of a strong solution of maximum concentration, in simplifying the design and manufacturing technology of the absorber, reducing its size and metal consumption.

 The task is achieved due to the presence of the following set of essential features.

 A method of producing cold in an absorption-diffusion refrigeration unit by supplying a strong solution to the separator by means of a steam lift pump operating with a refrigerant vapor supplied from a boiler, while using an additional steam lift pump operating with a refrigerant vapor from a boiler and included in a line of refrigerant vapor between separator and condenser, the solution from the absorber is fed to an additional separator.

 Refrigerant vapor from an additional separator is sent to a condenser.

 From an additional separator, the solution is fed to the surface of the aggregate element located inside the absorber.

 From an additional separator, the solution is fed onto the pipe surface with a cold vapor-gas mixture.

 From the additional separator, the solution is fed to the surface of the additional evaporator, in which the refrigerant evaporated as a result of heat exchange between the strong solution discharged from the separator to the boiler and the heat-dissipating elements of the unit, and condensed in the additional condenser.

 From an additional separator, the solution is sent to an additional absorber.

 The absorption-diffusion refrigeration unit contains a boiler, an absorber with solution inlet and outlet fittings, a condenser, an evaporator, a steam lift pump for lifting a strong solution into the separator, working with refrigerant vapor from the boiler, the level of the boiling solution at which is higher than the level of supply of a weak solution to the absorber , a gas-vapor mixture pipe and a steam line with a water lock, while the unit is equipped with an additional steam lift pump with a lifting pipe, an additional separator, and the steam cavity of the separator under it is connected through a steam line through a water trap to the riser pipe of the additional steam lift pump, the upper end of which is inserted into the steam cavity of the additional separator associated with the steam cavity of the condenser, and the lower end is connected with the formation of a water trap to the tank in the lower part of the absorber, while the liquid cavity of the additional separator is connected through water lock with a nozzle for introducing the solution into the absorber.

 The output end of the nozzle for introducing the solution into the absorber from the additional separator is located above the upper part of the vapor-gas mixture pipe installed with a gap inside the cylindrical body of the absorber with plugged ends.

 The unit is equipped with heat-dissipating elements, an additional condenser, heat exchangers between the strong solution discharged from the separator to the boiler, and heat-dissipating elements, the part of the vapor cavity heated by the strong solution is connected to the steam cavity of the additional condenser, as well as an additional evaporator, while the absorber is made in the form of a cylindrical body with plugged ends, inside of which an additional evaporator is installed with a gap with a lower end open and connected to rovoy cavity absorber, and with the upper end sealingly connected to the refrigerant supply tube from an additional condenser with an absorber housing and the pipe with the gas-vapor mixture, installed with a gap in the supplementary evaporator, wherein the upper portion of the absorber and the vapor cavities additional evaporator communicated using holes.

 The outlet end of the nozzle for introducing the solution into the absorber from the additional separator is located above the upper part of the additional evaporator.

 The outlet end of the nozzle for introducing a weak solution from the boiler into the absorber is located above the inner surface of the absorber housing, and the nozzle for discharging the strong solution from the absorber to the parlift pump is connected to an additional tank in the lower part of the absorber.

 The capacity in the lower part of the absorber is formed by the absorber body and installed with a gap inside the absorber body, hermetically connected to the lower end of the absorber by a partition wall cylinder with an open upper end, and the additional capacity in the lower part of the absorber is formed by the partition wall cylinder and the bottom end of the absorber.

 The lower open end of the vapor-gas mixture pipe is located in the vapor cavity of the additional tank in the lower part of the absorber.

 The lower open end of the additional evaporator is located in the steam cavity of the additional tank in the lower part of the absorber.

 The absorption-diffusion refrigeration unit contains a boiler, an absorber with solution inlet and outlet fittings, a condenser, an evaporator, a steam lift pump for lifting a strong solution into the separator, working with the help of refrigerant vapor from the boiler, the level of the boiling solution at which is higher than the level of supply of a weak solution to the absorber as well as a steam line with a water lock. In addition, the unit is equipped with an additional lift pump with a lift pipe, an additional separator and an additional absorber. In this case, the steam cavity of the separator is connected via a steam line through the hydraulic lock to the riser pipe of the additional steam lift pump, the upper end of which is inserted into the steam cavity of the additional separator associated with the steam cavity of the condenser, and the lower end is connected with the formation of a water seal to the tank in the lower part of the absorber, while the cavity of the additional separator is connected through a water trap to the fitting for introducing the solution into the additional absorber.

 The upper and lower parts of the vapor cavity of the absorber are connected respectively to the upper and lower parts of the vapor cavity of the additional absorber.

 Figure 1-3 presents schematic drawings of refrigeration units that allow you to implement the inventive method of producing cold in ADHA and give a visual representation of the design features of the claimed ADHA.

 Consider the inventive method for producing cold in ADHA in Fig. 1, which contains a steam lift pump 1 for lifting a strong solution into a separator 2, which works with the help of refrigerant vapor from a boiler 3, the level of boiling solution (▽ a) in which is higher than the level of supply of a weak solution (▽ b) into the absorber 4. The vapor cavity of the separator 2 is connected via a steam line 5 through a water trap to the riser pipe of the additional steam lift pump 6, the upper end of which is introduced into the steam cavity of the additional separator 7, connected with the steam cavity of the sensor 8, and the lower end is connected with the formation of a water seal to the tank 9 in the lower part of the absorber 4. In this case, the liquid cavity of the additional separator 7 is connected through the water seal to the nozzle 10 for introducing the solution into the absorber 4. The output end of the nozzle 10 for introducing the solution into the absorber 4 from the additional separator 7 is located above the upper part of the vapor-gas mixture (PGS) pipe 11, installed with a gap inside the cylindrical body of the absorber with plugged ends.

 The output end of the nozzle 12 for introducing a weak solution from the boiler 3 into the absorber 4 is located above the inner surface of the absorber casing 4, and the nozzle 13 for outputting the strong solution from the absorber to the steam lift pump 1 is connected to an additional tank 14 at the bottom of the absorber 4.

 The container 9 in the lower part of the absorber 4 is formed by the body of the absorber 4 and installed with a gap inside the absorber body, hermetically connected to the lower end of the absorber 4 by a partition wall cylinder 15 with an open upper end, and an additional container 14 in the lower part of the absorber 4 is formed by a partition wall cylinder 15 and the lower end of the absorber 4. In this case, the lower open end of the pipe PGS 11 is located in the steam cavity of the additional tank 14 in the lower part of the absorber 4.

 To reduce heat loss, the boiler 3 is closed by thermal insulation (not shown).

 The work of ADHA in figure 1 is as follows.

 The internal cavity of ADHA is evacuated and filled with a water-ammonia solution and hydrogen according to known parameters and proportions.

 As a result of heat removal from the electric heater 16, a strong solution boils. Due to the excess pressure, the refrigerant vapor squeezes the strong solution in the hydraulic lock (level ▽ c) and enters the riser pipe of the steam lift pump 1. This creates a two-phase mixture, which is fed through the riser pipe to the separator 2, where the strong solution and the refrigerant vapor are separated.

 The unit is equipped with a pipe-in-pipe type heat exchanger, a condenser 8 and a reflux condenser 17. A strong solution from the separator 2 enters sequentially into the annulus of the condenser 8, the reflux condenser 17 and then passes to the boiler 3. Refrigerant fumes resulting from heat exchange between the strong solution and parts of the boiler that are not involved in the evaporation of the strong solution are removed from the boiler body 3 to an additional condenser 18. Refrigerant vapor from the annular cavity of the condenser 8 and defl gmatora 17 are also displayed in the additional condenser 18. The liquefied refrigerant from the auxiliary capacitor 18 is supplied to a condenser 8.

 A weak solution from the boiler 3 through the nozzle 12 enters the inner surface of the body of the absorber 4 and when draining absorbs ammonia vapor from the ASG. The resulting "semi-solid" solution accumulates in a container 9 in the lower part of the absorber (level ▽ g) and through a water trap enters the riser pipe of the additional parlift pump 6.

 The refrigerant vapor from the separator 2 squeezes out the solution in the hydraulic lock (level ▽ g) of the additional steam lift pump 6. The resulting two-phase mixture is supplied to the additional separator 7. The refrigerant vapor from the additional separator 7 enters the condenser 8 through the reflux condenser 8, where it is liquefied. The liquid refrigerant flows into the evaporator 19, in which it boils at low pressure, producing a refrigerating effect. The resulting cold ASG through the pipe 11 enters the absorber 4.

 The solution from the additional separator 7 through the nozzle 10 is fed to the surface of the ASG pipe and, when draining, absorbs ammonia vapor from the ASG. Almost pure hydrogen enters the evaporator 19. Since the lower open end of the ASG pipe 11 is located in the vapor cavity of the additional tank 14 in the lower part of the absorber 4, the strong solution formed during the absorption process after draining accumulates in the additional tank 14 at level (c) and through the nozzle 13 is fed to the input of the lift pipe of the lift pump 1. After this, the ADHA duty cycle is repeated.

 The technical result from the implementation of the claimed invention is that a 2-time supply of the solution to the absorber allows for more complete absorption of ammonia vapor from the ASG, i.e. increase the efficiency of the absorber. In addition, re-supplying the solution to the absorber makes it possible to simplify the design and manufacturing technology of the absorber (replace the coil absorber with an absorber with a vertical cylindrical body), reduce the dimensions of the absorber, i.e. reduce the intensity of the unit.

 The essence of the proposed method of producing cold in ADHA in figure 1 is that by means of an additional steam lift pump 6, which works with the help of refrigerant vapor from the boiler 3 and connected to the line of refrigerant vapor between the separator 2 and the condenser 8, the solution from the absorber 4 is fed into an additional separator 7. Refrigerant vapor from the additional separator 7 is sent to the condenser 8, and the solution from the additional separator 7 is fed to the surface of the unit element located inside the absorber 4.

 In ADHA in figure 1, such an element is the pipe ASG 11.

 The technical result from the implementation of the proposed solution is to increase the efficiency of the absorber by increasing the interaction time of cold ASG and the solution in the absorption process.

 Comparison of the claimed ADHA not only with the prototype, but also with other technical solutions in this technical field, did not reveal the signs that distinguish the claimed ADHA from the prototype. This gives reason to recognize the proposed solution in accordance with the criteria of the invention.

 The inventive method of producing cold can also be implemented in ADHA, a schematic drawing of which is presented in figure 2.

 The assembly in FIG. 2 contains the same structural elements as the ADHA in FIG. 1, namely: a steam lift pump 20, a separator 21, a boiler 22, an absorber 23, a steam line 24, an additional steam lift. pump 25, additional separator 26, condenser 27, container 28 at the bottom of the absorber 23, nozzle 29 for introducing the solution into the absorber from the additional separator, PGS pipe 30, nozzle 31 for introducing a weak solution from the boiler 22 into the absorber 23, nozzle 32 for draining the strong solution from absorber into the steam lift pump 20, an additional tank 33 at the bottom of the absorber 23, a baffle 34, an electric heater 35, a reflux condenser 36, an additional condenser 37, an evaporator 38.

 During the operation of ADHA in FIG. 2, the listed structural elements have the same functional value as the ADHA elements of the same name in FIG. 1. Design features, the form of interaction of the listed elements with each other and their participation in the heat and mass transfer processes of the ADHA working cycle in FIG. 2 are identical to the functions of the same ADHA elements in FIG. 1.

 The characteristic levels of solution (a), (b), (c), and (d) indicated in FIG. 2 have the same physical meaning as the levels of the same name in FIG. 1.

 The stages of the ADHA work cycle in FIG. 1 have been described in sufficient detail above, therefore, to avoid repetition, similar stages of the ADHA work cycle in FIG. 2 are not described.

 It should be noted the following distinctive features of the working cycle ADHA in figure 2.

 Refrigerant vapors evaporated as a result of heat exchange between the strong solution discharged from the separator 21 to the boiler 22 and the heat-dissipating elements of the unit, in particular the condenser 27, the reflux condenser 36 and the elements of the boiler 22, which are not directly involved in the evaporation of the strong solution, enter the additional condenser 37 where liquefied. After that, the refrigerant flows into an additional evaporator 39, which is installed with a gap in the cylindrical body of the absorber 23. The lower end of the additional evaporator 39 is open and connected to the vapor cavity of the absorber 23, and the upper end is hermetically connected to the refrigerant supply pipe 40 from the additional condenser 37, with the absorber case 23 and with a PGS 30 pipe installed with a gap in the additional evaporator 39. The upper parts of the vapor cavities of the absorber 23 and the additional evaporator 39 are communicated through the hole 41.

 The output end of the nozzle 29 for introducing the solution into the absorber from the additional separator 26 is located above the upper part of the additional evaporator 39, the lower end of which is located in the steam cavity of the additional tank 33 in the lower part of the absorber 23.

 In the upper part of the absorber 23 there is a practically pure inert gas (hydrogen), which through the opening 41 enters the additional evaporator 39. Due to this, the supplied liquefied refrigerant evaporates in the additional evaporator 39, producing a refrigerating effect. The resulting ASG through the open lower end of the additional evaporator 39 enters the absorber 23.

 A weak solution from the boiler 22 through the fitting 31 enters the inner surface of the body of the absorber 23 and, when draining, absorbs ammonia vapor from the ASG. The resulting “semi-solid” solution accumulates in the tank 28 and is supplied to an additional separator 26 via an additional steam lift pump 25 and then reintroduced through the nozzle 29 into the absorber onto the surface of the additional evaporator 39. When draining along the surface of the additional evaporator 39, the solution absorbs refrigerant vapor from the ASG and accumulates in the additional tank 33, and almost pure hydrogen enters the evaporator 38. A strong solution from the additional tank 33 through the nozzle 32 and the water seal is led to the parlif Nome pump 20. Thereafter, the duty cycle repeats Adha.

 The technical result from the implementation of the proposed solution is to create conditions for increasing the efficiency of the absorber.

 Thus, the essence of the proposed method for producing cold using ADHA in FIG. 2 consists in the fact that from the additional separator 26, the solution is supplied to the surface of the additional evaporator 39, in which the refrigerant evaporated as a result of heat exchange between the strong solution removed from the separator 21 to the boiler 22 and the heat-dissipating elements of the unit, and condensed in the additional condenser 37 .

 In addition, the inventive method for producing cold using ADHA in FIGS. 1, 2 provides that the liquid cavity of the additional ADCA separator 26 in FIG. 2 (or 7 ADHA in FIG. 1) is included in the solution line between the ADHA capacity 28 in FIG. 2 (or 9 ADHA in FIG. 1) and an additional capacity 33 ADHA in FIG. 2 (or 14 ADHA in FIG. 1) located at the bottom of the ADHA absorber 23 in FIG. 2 (or 4 ADHA in FIG. 1).

 This distinctive feature of the proposed method provides consistent movement of the solution in the absorber, which allows for a deeper purification of ASG from the refrigerant vapor and to obtain a strong solution of maximum concentration by increasing the absorption time of the solution of refrigerant vapor from the ASG.

 When studying other known methods for producing cold in ADHA, signs that distinguish the claimed method from the prototype were not identified and therefore they provide the claimed method with the criteria of the invention.

 The claimed method of producing cold in ADHA can also be implemented in ADHA, a schematic drawing of which is presented in figure 3.

 In order to describe ADHA in figure 3, we note the following.

 ADHA in figure 3 contains structural elements that, during operation of the unit, perform functions similar to the functions of the corresponding elements of the same ADHA in figures 1, 2, namely the steam lift pump 42, separator 43, boiler 44, steam pipe 45, additional steam lift pump 46, an additional separator 47, a condenser 49, a nozzle 50 for introducing a weak solution from the boiler 44 into the absorber 51, a reflux condenser 48, an additional condenser 53, an evaporator 52.

 Design features, the form of interaction of these elements with each other and their purpose in the implementation of the ADHA work cycle in Fig. 3 completely coincide with the design features and purpose of the same ADHA elements in Fig. 1, which have already been discussed in detail above, therefore, are not described in order to avoid repetition . The stages of the working cycle of the claimed ADHA in figure 3, in which these elements are involved, can easily be traced to the similar stages of the working cycle of ADHA in figure 1 described above.

 The characteristic solution levels (a), (b), (c), and (d) indicated in FIG. 3 have the same physical meaning as the levels of the same name in FIG. 1.

 It should be noted the following structural differences ADHA in figure 3.

 The vapor cavity of the separator 43 is connected via a steam line 45 through a water trap to the riser pipe of the additional steam lift pump 46, the upper end of which is inserted into the steam cavity of the additional separator 47, connected through the reflux condenser 48 to the steam cavity of the condenser 49, and the lower end is connected with the formation of a water seal to the tank 54 in the lower part of the absorber 51. In this case, the liquid cavity of the additional separator 47 is connected through a water trap with a fitting 55 for introducing the solution into the additional absorber 56, in which CBC with clearance on the pipe 57. The pipe CBC 57 can be set and in the absorber 51, as it does not affect the sequence of the operating cycle Adha 3.

 The upper and lower parts of the vapor cavity of the absorber 51 are connected respectively to the upper and lower parts of the vapor cavity of the additional absorber 56 by means of pipes 58, 59.

 The fitting 60 for draining the strong solution from the additional absorber 56 to the steam lift pump 42 is connected to a container 61 at the bottom of the additional absorber 56.

 The work of ADHA in figure 3 is as follows.

 The unit is filled with circulating substances of known proportions and parameters.

 As a result of heat removal from the electric heater 62, a strong solution boils. Refrigerant vapors, due to overpressure, squeeze the strong solution and water trap at level (c) and enter the riser pipe of the steam lift pump 42.

 Further, the ADHA work cycle in FIG. 3 has stages similar to the stages of the ADHA work cycle in FIG. 1, with the exception of the following.

 A weak solution from the boiler 44 through the fitting 50 enters the inner surface of the absorber 51 and, when draining on it, absorbs refrigerant vapor from the ASG. The partially absorbed solution accumulates in the container 54 in the lower part of the absorber 51 at the level of (g) and, through a water trap, enters the riser pipe of the additional parlift pump 46.

 The refrigerant vapor from the separator 43 through the steam line 45 due to overpressure squeeze the solution in the hydraulic lock at the level of (g) and enter the riser pipe of the additional steam lift pump 46, by which the two-phase mixture is fed to the additional separator 47, where the solution and the refrigerant vapor are separated. Refrigerant vapors then pass through a reflux condenser 48 to a condenser 49, where they are liquefied. The liquid refrigerant flows into the evaporator 52, in which it boils, producing a refrigerating effect. The resulting cold ASG through the pipe enters the additional absorber 56 and through the pipe 59 to the absorber 51. Almost pure hydrogen from the upper part of the absorber 51 through the pipe 58 enters the additional absorber 56 and then to the evaporator 52.

 The solution from the additional separator 47 through the hydraulic lock with the help of the nozzle 55 is introduced into the additional absorber 56 on its inner surface, when draining along which it absorbs refrigerant vapor from the ASG. The resulting strong solution of maximum concentration accumulates in the tank 61 in the lower part of the additional absorber 56 at level (c) and through the nozzle 60 enters the steam lift pump 42. After that, the ADHA working cycle in FIG. 3 is repeated.

 Thus, the essence of the proposed method for producing cold in ADHA in figure 3 is that from an additional separator 47, the solution is sent to an additional absorber 56.

 The economic feasibility of implementing in practice the proposed method for producing cold in ADHA in FIGS. 1-3 is to reduce the daily power consumption of household refrigerators by increasing the cooling capacity of ADHA.

Sources of information
1. A.S. USSR 844949, IPC F 25 B 15/10, 1979

 2. RF patent 2031328, MPK F 25 B 15/10, 1995

Claims (16)

 1. A method of producing cold in an absorption-diffusion refrigeration unit by supplying a strong solution to the separator by means of a steam lift pump operating with a refrigerant vapor supplied from a boiler, characterized in that by means of an additional steam lift pump operating with a refrigerant vapor from a boiler and included in a line of refrigerant vapor between the separator and the condenser, the solution from the absorber is fed to an additional separator.  2. The method according to p. 1, characterized in that the refrigerant vapor from the additional separator is sent to the condenser.  3. The method according to p. 1 or 2, characterized in that the solution is fed from an additional separator to the surface of the aggregate element located inside the absorber.  4. The method according to any one of paragraphs. 1-3, characterized in that the solution is fed from the additional separator to the surface of the pipe with a cold vapor-gas mixture.  5. The method according to any one of paragraphs. 1-3, characterized in that the solution is supplied from the additional separator to the surface of the additional evaporator, in which the refrigerant evaporated as a result of heat exchange between the strong solution discharged from the separator into the boiler and the heat-dissipating elements of the unit and condensed in an additional condenser.  6. The method according to p. 1 or 2, characterized in that the solution is sent from an additional separator to an additional absorber.  7. The absorption-diffusion refrigeration unit contains a boiler, an absorber with solution inlet and outlet fittings, a condenser, an evaporator, a steam lift pump for lifting a strong solution into a separator operating with a refrigerant vapor from a boiler, a level of boiling solution in which is higher than the level of supply of a weak solution into the absorber, the vapor-gas mixture pipe and the steam line with a water lock, characterized in that the unit is equipped with an additional steam lift pump with a lifting pipe, an additional separator, while the steam cavity l the separator is connected via a steam line through the hydraulic lock to the riser pipe of the additional steam lift pump, the upper end of which is introduced into the steam cavity of the additional separator connected to the vapor cavity of the condenser, and the lower end is connected with the formation of a water lock to the tank in the lower part of the absorber, while the liquid cavity of the additional separator connected through a water lock to the nozzle for introducing the solution into the absorber.  8. The assembly according to claim 7, characterized in that the output end of the nozzle for introducing the solution into the absorber from the additional separator is located above the upper part of the vapor-gas mixture pipe installed with a gap inside the cylindrical body of the absorber with plugged ends.  9. The unit according to claim 7, characterized in that it is equipped with heat-dissipating elements, an additional condenser, heat exchangers between the strong solution discharged from the separator into the boiler, and heat-dissipating elements, part of the vapor cavity heated by the strong solution connected to the steam cavity of the additional condenser, and additional evaporator, while the absorber is made in the form of a cylindrical body with plugged ends, inside of which an additional evaporator with a lower end is installed with a gap ohm, open and connected to the vapor cavity of the absorber, and with the upper end hermetically connected to the refrigerant supply pipe from the additional condenser, to the absorber body and to the vapor-gas mixture pipe installed with a gap in the additional evaporator, the upper parts of the vapor cavities of the absorber and additional evaporator communicated by hole.  10. The unit according to claim 7 or 9, characterized in that the output end of the nozzle for introducing the solution into the absorber from the additional separator is located above the upper part of the additional evaporator.  11. The unit according to any one of paragraphs. 7-10, characterized in that the output end of the nozzle for introducing a weak solution from the boiler into the absorber is located above the inner surface of the absorber housing, and the nozzle for outputting the strong solution from the absorber to the parlift pump is connected to an additional tank in the lower part of the absorber.  12. The unit according to any one of paragraphs. 7-11, characterized in that the container in the lower part of the absorber is formed by the absorber body and installed with a gap inside the absorber body, hermetically connected to the lower end of the absorber with a partition wall cylinder with an open upper end, and the additional capacity in the lower part of the absorber is formed by a partition cylinder and lower end of the absorber.  13. The unit according to any one of paragraphs. 7, 8, 11, 12, characterized in that the lower open end of the vapor-gas mixture pipe is located in the steam cavity of the additional tank in the lower part of the absorber.  14. The unit according to any one of paragraphs. 7, 9-12, characterized in that the lower open end of the additional evaporator is located in the steam cavity of the additional capacity in the lower part of the absorber.  15. Absorption-diffusion refrigeration unit containing a boiler, an absorber with solution inlet and outlet fittings, a condenser, an evaporator, a steam lift pump for lifting a strong solution into a separator operating with a refrigerant vapor from a boiler, the level of the boiling solution in which is higher than the level of supply of a weak solution in the absorber, as well as the steam line with a water lock, characterized in that the unit is equipped with an additional steam lift pump with a lift pipe, an additional separator and an additional absorber, while the separator’s hollow cavity is connected via a steam line through the hydraulic lock to the riser pipe of the additional steam lift pump, the upper end of which is inserted into the additional separator’s steam cavity, connected with the condenser’s vapor cavity, and the lower end is connected with the formation of a hydraulic lock to the tank in the lower part of the absorber, while the liquid cavity of the additional the separator is connected through a water trap to the fitting for introducing the solution into the additional absorber.  16. The unit according to p. 15, characterized in that the upper and lower parts of the vapor cavity of the absorber are connected respectively to the upper and lower parts of the vapor cavity of the additional absorber.

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