CN201348401Y - Absorption type refrigerating device with energy compensation - Google Patents

Abstract

An absorption refrigeration device with energy compensation belongs to the technical field of refrigeration. Described magnetic pump adopts the dual power magnetic drive pump with hydraulic motor, the liquid inlet (5) of hydraulic motor on the double power magnetic drive pump is communicated with the pipeline from generator liquid outlet, and the liquid outlet of hydraulic motor ( 13) Connect with the liquid return pipe flowing to the absorber. Using the return hydraulic pressure difference between the generator and the absorber, the hydraulic motor that shares the same axis with the magnetic pump is driven for energy compensation, which reduces the energy consumption of the magnetic pump, improves the reliability and durability of the liquid supply pump, and reduces energy consumption. Small, high cooling efficiency (COP), simple structure, small volume and weight, suitable for use in various refrigeration systems.

Description

An absorption refrigeration device with energy compensation

technical field

The utility model relates to an absorption refrigeration device, in particular to an absorption refrigeration device with energy compensation. It belongs to the technical field of refrigeration.

Background technique

The absorption refrigeration system is one of the effective ways to solve a series of environmental problems caused by the use of freon. At the same time, the absorption refrigeration system also has the advantages of using low-temperature heat sources as power.

At present, absorption refrigerators include ammonia-water absorption type, lithium bromide-water absorption type and ammonia-hydrogen-water diffusion absorption type. The ammonia-water absorption refrigerator uses ammonia as the refrigerant and water as the absorbent, and can achieve a temperature below 0°C, but the ammonia solution has a corrosive effect on non-ferrous metal materials (except phosphor bronze), and because ammonia and water are in The gasification temperature under the same pressure is relatively close (for example, at a standard atmospheric pressure, the boiling points of ammonia and water are -33°C and 100°C, respectively, and the difference between the two is only 133.4°C), so rectification equipment must be used. The lithium bromide-water suction refrigerator uses lithium bromide as the water absorbent and water as the refrigerant. Generally, it can only produce a temperature above 5°C, and it needs to be kept in a vacuum state. Its crystallization and corrosion problems also pose a threat to the operation and maintenance of the refrigeration system. Here comes the big question. The working fluid pair of the diffusion absorption refrigerator is ammonia-hydrogen-water. Among the three components, ammonia is the refrigerant, hydrogen is the diffusing agent, and water is the absorbent. The refrigeration cycle consists of the evaporation and condensation of ammonia and the absorption of ammonia water. Combining with the process of analyzing ammonia gas, the diffusion ability of hydrogen is very strong. In the cycle, due to the diffusion of hydrogen gas in the evaporator, the partial pressure of ammonia is reduced. Since there is no throttle valve between the condenser and the evaporator, The total pressure in the evaporator is equal to the condensing pressure, and the ammonia liquid in the evaporator can produce evaporative cooling effect at a lower ammonia partial pressure. At the same time, due to the thermosiphon effect generated by the density difference when the solution is heated to boiling, the solution circulates between the absorber and the generator without a mechanical pump. If ammonia-water is used as the working fluid in this system, a rectification system must be installed, and the use of a thermosiphon pump to promote circulation has a small cooling capacity and low cooling efficiency.

Chinese Patent Publication No.: CN101029783, Publication Date: September 5, 2007, Invention Name: "Sodium Thiocyanate-Ammonia Diffusion and Absorption Refrigeration Device", which proposes to connect one end of the generator with a gas-liquid separator for gas-liquid separation The top of the condenser is connected to the diffusion tank through the condenser, the bottom of the gas-liquid separator is connected to the pump through the solution heat exchanger, the bottom of the diffusion tank is connected to the evaporator through the pump to form a closed loop, and the diffusion tank is connected to the upper and lower ends of the absorber respectively. One end of the absorber forms a circulating loop with the cooler, and the absorber is connected to the solution heat exchanger through a pump at the same time. This scheme omits the rectification device, adopts the magnetic pump, the lower heat source temperature can meet the requirements of the drive system, and improves the refrigeration efficiency. However, in this solution, due to the diffusion of hydrogen, the vaporization rate of the refrigerant decreases, which restricts the further improvement of the thermal coefficient of the system.

Contents of the invention

The purpose of this utility model is to propose a system with low energy consumption, solution The pump output torque is high, the reliability and durability are good, and the absorption refrigeration device with energy compensation can make the absorption refrigeration system miniaturized.

The purpose of this utility model is achieved by the following methods: an absorption refrigeration device with energy compensation, including a generator, a condenser, an absorber, an evaporator and a magnetic pump, and the magnetic pump adopts a hydraulic motor The dual-power magnetic drive pump, the liquid inlet of the hydraulic motor on the dual-power magnetic drive pump is connected with the liquid pipeline from the generator, and the liquid outlet of the hydraulic motor is connected with the liquid return pipeline flowing to the absorber.

The liquid inlet of the hydraulic motor on the dual-power magnetic drive pump is connected with the hot liquid outlet pipe of the solution heat exchanger, and the hot liquid inlet pipe of the solution heat exchanger is connected with the generator, or connected with the generator through the gas-liquid separator. The liquid outlet of the hydraulic motor is connected with the liquid inlet pipe of the cooler, and the liquid outlet of the cooler is connected with the liquid return pipe of the absorber.

The liquid supply pump on the dual-power magnetic drive pump is a gear pump or a screw pump or a centrifugal pump.

The hydraulic motor on the dual-power magnetic drive pump is a gear hydraulic motor.

The dual power magnetic drive pump described in the utility model has applied for invention and utility model patents to the Patent Office of the State Intellectual Property Office by the applicant on the same day.

Compared with the prior art, the utility model has the following obvious advantages:

1. The utility model uses a dual-power magnetic pump with energy compensation as the power source, and uses the return hydraulic pressure difference between the generator and the absorber to drive the hydraulic motor that shares the same axis with the magnetic pump for energy compensation, reducing the pressure on the liquid supply pump. Low energy consumption improves the reliability and durability of the liquid supply pump.

2. Compared with lithium bromide-water, ammonia-hydrogen-water and ammonia-water refrigeration devices, the utility model has a much smaller volume and weight than them under the same power.

3. The device of this utility model is equipped with a set of cooling loops driven by the liquid supply pump for forced circulation of the working fluid to the solution, to cool down the temperature and pressure of the working fluid in the absorber, so that the absorption capacity of the absorber is significantly higher than that of the traditional absorber. improvement.

4. Compared with the current absorption refrigeration device, the utility model has the advantages of simple structure, efficient operation and no leakage, and the production cost and operation cost can be greatly reduced.

Description of drawings

Fig. 1 is the functional block diagram of the first structure of the utility model;

Fig. 2 is the functional block diagram of the second structure of the utility model;

Fig. 3 is a structural representation of a dual-power magnetic drive pump in the utility model;

Fig. 4 is a functional block diagram of the third structure of the utility model.

In the figure, the driven gear shaft 1, the liquid supply pump inlet 2, the driven gear 3, the hydraulic motor input gear 4, the hydraulic motor liquid inlet 5, the rear end cover 6, the sealing end cover 7, the driving magnetic ring 8, Motor 9, driven magnetic core 10, hydraulic motor output gear 11, driving gear 12, hydraulic motor liquid outlet 13, central end plate 14, liquid supply pump liquid outlet 15, front end cover 16, drive shaft 17, hydraulic motor input Gear shaft 18.

Detailed ways

Below in conjunction with accompanying drawing description and specific embodiment, the utility model is described in further detail:

Referring to Fig. 1, an absorption refrigeration device with energy compensation of the present utility model includes a generator, a condenser, an absorber, an evaporator and a magnetic pump, and the magnetic pump adopts a dual-power magnetic drive with a hydraulic motor Pump, the liquid inlet 5 of the hydraulic motor on the dual-power magnetic drive pump communicates with the pipeline from the generator liquid outlet, and the liquid outlet 13 of the hydraulic motor communicates with the liquid return pipeline flowing to the absorber.

In the existing absorption refrigeration system, the liquid working medium in the absorber is output to the generator through a pump, and part of the liquid working medium entering the generator becomes refrigerant vapor under the action of temperature and pressure. After being cooled by the condenser and evaporator, it flows back to the absorber; another part of the liquid working medium inside the generator, such as dilute ammonia solution, directly flows back to the absorber under pressure. For the absorption refrigeration system, under normal circumstances, the liquid pressure difference between the generator and the absorber can reach 1.5-2.5Mpa, and the dual-power magnetic drive pump can make full use of the liquid pressure difference to drive the liquid supply pump to do work. The dual-power pump shown in Figure 1 is the dual-power magnetic drive pump in the utility model. The liquid supply pump liquid inlet 2 on the dual-power pump is connected with the liquid outlet of the absorber through a pipeline, and the liquid supply pump goes out The liquid port 15 is connected to the liquid inlet of the generator through the pipe, the liquid inlet 5 of the hydraulic motor is connected to the liquid outlet of the generator through the pipe, and the liquid outlet 13 of the hydraulic motor is connected to the liquid return port on the absorber through the pipe . When working, the motor of the dual-power pump of the utility model rotates, and the liquid working medium in the absorber enters the generator through the liquid supply pump on the dual-power magnetic drive pump, and the high-pressure liquid working medium in the generator pushes the dual-power pump to The hydraulic motor rotates and provides additional power to the liquid supply pump. Through the power compensation function of the hydraulic motor, it can overcome the gap between the driving magnetic ring 8 and the driven magnetic core 10 when the magnetic drive pump provides too high output torque. The hysteresis effect of torque increase and speed asynchronous, resulting in high temperature leads to the reduction of the output flow of the magnetic drive pump, parking, or even damage, and the reliability and durability are greatly improved. The output torque and volume of the magnetic pump can be further reduced, and the energy consumption is small. Therefore, the device of the utility model can promote the commercial transformation and application of the miniaturization of the absorption refrigerating machine, and provides an effective solution for meeting different refrigeration demands.

Referring to Fig. 2, another structure of the existing absorption refrigeration device is to connect one end of the generator to the gas-liquid separator, and the liquid outlet on the gas-liquid separator is connected to the hot liquid inlet of the solution heat exchanger through a pipeline. or one end of the generator is directly connected to the hot liquid inlet of the solution heat exchanger through a pipe, the cold liquid inlet of the solution heat exchanger is connected to the liquid outlet pipe of the absorber, and the cold liquid outlet of the solution heat exchanger The liquid port communicates with the liquid inlet pipe of the generator. A cooler is connected in series on the liquid return line of the absorber. In this case, the liquid inlet 5 of the hydraulic motor on the dual-power magnetic drive pump can be communicated with the hot liquid outlet pipe of the solution heat exchanger. The hot liquid inlet pipe of the solution heat exchanger is connected with the liquid outlet of the generator or the liquid outlet of the generator through the gas-liquid separator, and the liquid outlet 13 of the hydraulic motor is connected with the liquid inlet pipe of the cooler, and the cooler The liquid outlet of the absorber is connected with the liquid return pipe of the absorber.

Referring to Fig. 3 , the active rotary part on the existing magnetic drive gear pump is a drive gear 12, and one or both ends of the motor 9 are fixed with a driving magnetic ring 8, and a driven magnetic core 10 is correspondingly arranged inside the driving magnetic ring 8, There is a gap between the driven magnetic core 10 and the driving magnetic ring 8 to form a non-contact connection under the action of the magnetic force lines. A rear end cover 6 is fixed on one or both ends of the motor 9 housing, and a sealing end cover 7 is also provided between the motor 9 and the rear end cover 6 to ensure the sealing effect. The center of the driven magnetic core 10 is fixed with a driving shaft 17 , the driving shaft 17 passes through the rear end cover 6 and is fixedly connected with the driving gear 12 , and the other end of the driving shaft 17 supports the front end cover 16 . The pump body of the gear liquid supply pump is contained in the outside of the driving gear 12 and the driven gear 3, and forms the outer shell of the gear liquid supply pump together with the rear end cover and the front end cover 16. The pump body of the gear liquid supply pump is provided with a liquid supply Pump liquid inlet 2 and liquid supply pump liquid outlet 15. The driving gear 12 meshes with the driven gear 3 inside the pump body of the gear liquid supply pump, and the two ends of the driven gear shaft 1 of the liquid supply pump are respectively supported on the rear end cover 6 and the front end cover 16 . When the magnetic pump is running, the motor 9 drives the driving magnetic ring 8 to rotate, and under the action of the magnetic field of the driving magnetic ring 8, the driven magnetic core 10 rotates thereupon, and drives the driving gear 12 and the driven gear 3 to run through the driving shaft 17, Press the liquid at the liquid inlet 2 of the liquid supply pump to the liquid outlet 15 of the liquid supply pump, so as to achieve the purpose of delivering fluid.

The utility model adds a hydraulic motor on the side of the pump body of the gear liquid supply pump. The hydraulic motor can be arranged outside the gear liquid supply pump, that is, the gear liquid supply pump is arranged between the hydraulic motor and the driven magnetic core 10 . The hydraulic motor can also be arranged between the liquid supply pump and the driven magnetic core 10, the rear end cover 7 on one side of the hydraulic motor is fixed on the housing of the magnetic drive pump motor 9, and the center of the other side of the hydraulic motor The end plate 14 is connected with the liquid supply pump. A central end plate 14 is added between the rear end cover 6 and the front end cover 16, and the liquid supply pump inlet 2 and the liquid supply pump outlet 15 are arranged on the housing between the front end cover 16 and the central end plate 14 , the driving gear 12 and the driven gear 3 are installed inside the housing, the driving gear 12 is fixed on the driving shaft 17, the driven gear 3 is fixed on the driven gear shaft 1, and the two ends of the driven gear shaft 1 are respectively installed on On the front end cover 16 and the center end plate 14. The housing between the central end plate 14 and the rear end cover 6 is provided with a hydraulic motor liquid inlet 5 and a hydraulic motor liquid outlet 13 , and a hydraulic motor output gear 11 and a hydraulic motor input gear 4 are correspondingly installed. One end of the driving shaft 17 is fixed on the driven magnetic core 10, and the other end is fixedly connected to the output gear 11 of the hydraulic motor after passing through the rear end cover 6, and then fixedly connected to the driving gear 12 after passing through the central end plate 14, and finally the end Supported on the front end cover 16. Both ends of the hydraulic motor input gear shaft 18 are respectively supported on the central end plate 14 and the rear end cover 6 , and the middle part of the hydraulic motor input gear shaft 18 is fixedly connected with the hydraulic motor input gear 4 . In the utility model, the setting directions of the hydraulic motor liquid inlet 5 and the liquid supply pump liquid inlet 2 are the same, and the setting directions of the hydraulic motor liquid outlet 13 and the liquid supply pump liquid outlet 15 are the same. Since the hydraulic motor output gear 11 is fixed on the driving shaft 17 and is close to the hydraulic motor liquid outlet 13, when the hydraulic motor liquid inlet 5 flows into the fluid with higher pressure, the hydraulic motor input gear 4 can be pushed to rotate, and Drive the hydraulic motor output gear 11 to rotate, output power to the driving shaft 17, and then the high-pressure fluid flows out through the hydraulic motor liquid outlet 13 after doing work.

In Fig. 1 and Fig. 2, a liquid supply pump and a hydraulic motor are provided on the dual-power magnetic pump, and two liquid supply pumps and a hydraulic motor can also be provided as required, or two liquid supply pumps can be provided. pump and two hydraulic motors.

Referring to Fig. 3 and Fig. 4, the dual-power magnetic pump is provided with two liquid supply pumps, one is used for the delivery of the working fluid to the solution, and the other is used for the circulation of the working fluid to the solution in the absorber. The inlet 2 of the liquid supply pump on the two pumps is connected to the liquid outlet pipe of the absorber, and the liquid supply pump outlet 15 on one liquid supply pump is connected to the generator or the generated inlet through the solution heat exchanger. The liquid pipeline is connected, and the liquid outlet 15 of the liquid supply pump on the other liquid supply pump is connected with the liquid return pipeline of the absorber, or communicated with the liquid return pipeline of the absorber through the cooler. Due to the forced circulation of the working fluid to the solution flow circuit established between the liquid outlet and the liquid return port of the absorber through the liquid supply pump, it can be supplemented by forced air cooling or water cooling to reduce the temperature and pressure in the absorber. Compared with the traditional absorber, the absorption capacity of the absorber can be greatly improved. And the absorber working medium of the present utility model is in Fig. 1, on the dual power magnetic drive pump of a hydraulic motor and a liquid supply pump in Fig. 2 also can pass on the liquid supply pump outlet 15 This is achieved by connecting the return line to the absorber in parallel. At the same time, according to the principle of balancing the circulation of the working medium in the refrigeration system, the flow rates of the liquid supply pump and the hydraulic motor can be adjusted separately to ensure that the liquid in the absorber and generator fluctuates within the normal range without setting adjustment valves.

The liquid supply pump on the dual-power magnetic drive pump described in the utility model is a gear pump or a screw pump or a centrifugal pump. The hydraulic motor on the dual-power magnetic drive pump is a gear hydraulic motor.

When the motor of the dual-power pump of the present invention rotates, the power output by the motor 9 is transmitted to the driving shaft 17, and the driving gear 12 and the driven gear 3 are driven to run at the same time, and the liquid at the liquid inlet 2 of the liquid supply pump is pressed to the Liquid supply pump outlet 15, so as to achieve the purpose of conveying fluid. When high-pressure fluid is injected into the hydraulic motor inlet 5 of the dual power pump, the high-pressure fluid pushes the hydraulic motor input gear 4 to rotate, and drives the hydraulic motor output gear 11 to rotate, and the hydraulic motor output gear 11 transmits power to the drive shaft 17 , the driving shaft 17 drives the driving gear 12 and the driven gear 3 to rotate, and the liquid at the liquid inlet 2 of the liquid supply pump is pressed to the liquid supply pump outlet 15, thereby achieving the purpose of conveying fluid. In the utility model device, the motor 9 and the hydraulic motor on the dual power pump rotate at the same time, and provide power to the driving shaft 17 at the same time, which can greatly improve the output torque of the utility model dual power pump, and can better avoid the The high temperature generated by the magnetic coupling caused by the increase of the output torque of the magnetic pump. Therefore, the volume of the magnetic pump can be reduced, and the reliability and durability of the magnetic pump can be improved. The device of the utility model drives the hydraulic motor by using the remaining or useless high-pressure fluid in the refrigeration system, which has obvious effects of energy saving and environmental protection, and remarkable economic benefits.

The utility model device uses sodium thiocyanate-ammonia or lithium nitrate-ammonia as the working medium pair, and it is measured through operation: when the temperature of the heat source is at 75°C, the evaporation (refrigeration) temperature reaches -6°C, and when the temperature of the heat source is at 90-100°C ℃, evaporation (refrigeration) can reach -33 ℃. In the refrigeration unit, the required power of the magnetic pump is reduced.

Claims (5)

1. absorption type refrigerating unit with energy compensating, comprise generator, condenser, absorber, evaporimeter and magnetic drive pump, it is characterized in that: described magnetic drive pump adopts the double-power magnetically-actuated pump that has hydraulic motor, the inlet of hydraulic motor (5) is communicated with pipeline from the generator liquid outlet on the double-power magnetically-actuated pump, and the liquid outlet of hydraulic motor (13) is communicated with the back liquid pipeline that flows to absorber.

2. a kind of absorption type refrigerating unit according to claim 1 with energy compensating, it is characterized in that: the inlet of hydraulic motor (5) is communicated with the hydrothermal solution fluid pipeline of solution heat exchanger on the described double-power magnetically-actuated pump, the hydrothermal solution input duct of solution heat exchanger is communicated with the liquid outlet of generator with the liquid outlet of generator or by gas-liquid separator, the liquid outlet of hydraulic motor (13) is communicated with the input duct of cooler, and the liquid outlet of cooler is communicated with the back liquid pipeline of absorber.

3. a kind of absorption type refrigerating unit according to claim 1 with energy compensating, it is characterized in that: described magnetic force driving pump is provided with two solution feed pumps, solution feed pump inlet (2) on two solution feed pumps all is connected on the fluid pipeline of absorber, solution feed pump liquid outlet (15) on solution feed pump is communicated with the input duct of generator, and the solution feed pump liquid outlet (15) on another solution feed pump is communicated with the back liquid pipeline of absorber with the back liquid pipeline of absorber or through cooler.

4. a kind of absorption type refrigerating unit with energy compensating according to claim 1 and 2 is characterized in that: the hydraulic motor on the described double-power magnetically-actuated pump is a gear-type hydraulic motor.

5. according to claim 1 or 3 described a kind of absorption type refrigerating units with energy compensating, it is characterized in that: the solution feed pump on the described double-power magnetically-actuated pump is gear pump or screw pump or centrifugal pump.

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