Cold and heat driver and heat-driven absorption refrigeration device

Abstract

The utility model discloses a cold and hot driver and a thermally-driven absorption refrigeration device in the technical field of absorption refrigeration and heat pumps, the cold and hot driver comprises a pressure pump head and a heat exchange box, and a reciprocating assembly is arranged between the pressure pump head and the heat exchange box; the reciprocating assembly is used for providing pump force for the pressure pump head through heat expansion and cold contraction generated in the heat exchange process of cold and heat source media in the heat exchange box. An electric driving working medium pump is replaced with the cold and hot driver, the purpose of air thermal expansion and cold contraction in the space is achieved by utilizing the cold and hot source medium to flow and exchange heat in the limited closed space, and therefore the driving force is given to drive a piston in the cold and hot driver to do reciprocating motion, and the purpose of increasing the pressure of working medium liquid is achieved; dependence and consumption of the device on electric energy can be reduced, the energy utilization rate can be reduced, and the purpose of environmental protection is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of absorption refrigeration and heat pump, in particular to a cold and hot driver and a heat-driven absorption refrigeration device. Background Art

[0002] The heat-driven absorption refrigeration device uses low-grade waste heat to drive the thermal working fluid and refrigerates through the phase change of the working fluid (such as ammonia). The main equipment includes generator, condenser, evaporator, absorber, working fluid pump, etc. Figure 3 As shown, the low-grade waste heat is used to heat the generator, and the mixed solution rich in refrigerant (referred to as rich liquid) with a certain concentration delivered from the absorber by the working fluid pump desorbs most of the low-boiling-point refrigerant in the rich solution, and becomes high-pressure gaseous refrigerant and enters the condenser. The high-pressure gaseous refrigerant is condensed into high-pressure liquid refrigerant by circulating water, and the high-pressure liquid refrigerant is depressurized into low-pressure liquid refrigerant through the liquid ammonia pressure reducing valve. The low-pressure liquid refrigerant enters the evaporator, absorbs the heat of the medium to be cooled (the medium introduced by the user at the cold end) and vaporizes into low-pressure gaseous refrigerant, and the low-pressure gaseous refrigerant enters the absorber. The high-pressure lean liquid remaining after the generation process in the generator is depressurized into low-pressure lean liquid through the working fluid pressure reducing valve, enters the absorber, and is mixed and absorbed with the low-pressure gaseous refrigerant coming out of the evaporator to restore to its original concentration and become room-temperature rich liquid. The room-temperature rich liquid is pressurized by the working fluid pump and sent to the generator to continue circulating.

[0003] In the operation of the working fluid circulation system of the existing heat-driven absorption refrigeration device, since the working fluid cannot flow from the low-pressure end to the high-pressure end by itself, a working fluid pressure-raising pump (working fluid pump) is used to introduce the working fluid into the high-pressure generator (introducing the working fluid from the absorber into the generator). During this working fluid pressure-raising process, a large amount of electrical energy is consumed and the energy cannot be fully utilized. Utility Model Content

[0004] The utility model aims to provide a cold and hot driver and a heat-driven absorption refrigeration device to solve the problem in the above-mentioned background technology that a large amount of electric energy is consumed and the energy cannot be fully utilized during the pressure increase of the working fluid.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hot and cold driver, comprising a pressurizing pump head and a heat exchange box, wherein a reciprocating assembly is provided between the pressurizing pump head and the heat exchange box;

[0006] The reciprocating assembly is used to utilize the thermal expansion and contraction generated during the heat exchange process of the cold and hot source media inside the heat exchange box to provide pumping force for the pressurizing pump head.

[0007] Preferably, the reciprocating assembly includes a piston slidably arranged in a pressurizing pump head and a movable part slidably arranged in a heat exchange box, a plug rod is arranged between the movable part and the piston, an elastic part for driving the plug rod to reset is arranged in the heat exchange box, a heat exchange tube is arranged in the heat exchange box, an inlet and outlet for fluid to pass through is arranged on the pressurizing pump head, and the heat exchange box is filled with gas for contacting the heat exchange tube.

[0008] Preferably, solenoid valves are provided on the inlet and outlet of the heat exchange tube.

[0009] Preferably, a heat-driven absorption refrigeration device comprises: a generator, a condenser, an evaporator, an absorber and a cold and hot driver, wherein the cold and hot driver is one of the cold and hot drivers mentioned above, wherein the cold source entering the heat exchange box is the cooling medium coming out of the absorber, and the heat source is the heat flow medium coming out of the generator.

[0010] Preferably, the inlet of the pressurizing pump head is communicated with the working fluid outlet of the absorber, and the outlet of the pressurizing pump head is communicated with the working fluid inlet of the generator.

[0011] Preferably, the inlet of the heat exchange tube is respectively connected to the hot water outlet of the generator and the cooling water outlet of the absorber.

[0012] Preferably, a liquid ammonia pressure reducing valve is provided between the liquid ammonia outlet of the condenser and the liquid ammonia inlet of the evaporator.

[0013] Preferably, a working fluid pressure reducing valve is provided between the working fluid outlet of the generator and the working fluid inlet of the absorber.

[0014] Compared with the prior art, the beneficial effect of the utility model is as follows: in the present application, by replacing the electric-driven working fluid pump with a hot and cold driver, the hot and cold source medium is used to flow and exchange heat in a limited and enclosed space, so as to achieve the purpose of thermal expansion and contraction of the air in the space, thereby giving driving force to drive the piston in the hot and cold driver to do reciprocating motion, thereby achieving the goal of pressurizing the working fluid, which can reduce the device's dependence on and consumption of electrical energy, is conducive to reducing energy utilization rate, and achieves a more environmentally friendly purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the hot and cold drive of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the heat-driven absorption refrigeration device of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of a heat-driven absorption refrigeration device in the prior art of the utility model.

[0018] In the figure: 1. Pressurizing pump head; 2. Heat exchange box; 3. Piston; 4. Moving part; 5. Elastic part; 6. Heat exchange tube; 7. Solenoid valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example 1

[0021] See also Figure 1 , a hot and cold driver, comprising: a pressurizing pump head 1 and a heat exchange box 2, a reciprocating component is provided between the pressurizing pump head 1 and the heat exchange box 2;

[0022] Among them, see Figure 1 The reciprocating assembly includes a piston 3 and a moving part 4. The piston 3 is slidably installed in the inner cavity of the pressurizing pump head 1 (the piston 3 can move up and down in the inner cavity of the pressurizing pump head 1, and the side wall of the piston 3 and the inner side wall of the pressurizing pump head 1 are sealed), and the moving part 4 is slidably arranged in the inner cavity of the heat exchange box 2 (the moving part 4 is equivalent to the piston 3, and the side wall of the moving part 4 and the inner side wall of the heat exchange box 2 are sealed, and the moving part 4 can move up and down in the inner cavity of the heat exchange box 2), a plug rod is installed between the moving part 4 and the piston 3, and the pressurizing pump head 1 is provided with an inlet and an outlet (the piston 3 is at the inlet and outlet of the pressurizing pump head The inner cavity of the heat exchange box 2 is filled with gas (the gas can be air, and the gas filled in the heat exchange box 2 is below the moving part 4), an elastic part 5 (spring) is provided in the heat exchange box 2, and the two ends of the elastic part 5 are respectively connected to the inner wall of the heat exchange box 2 and the outer wall of the moving part 4 (for limiting the moving part 4 and the plug rod so that they do not move automatically), a heat exchange tube 6 is provided in the inner cavity of the heat exchange box 2, and the heat exchange tube 6 is below the moving part 4 (that is, the heat exchange tube 6 is in the gas-filled area); the inlet and outlet of the heat exchange tube 6 extend to the outside of the heat exchange box 2, and the inlet and outlet of the heat exchange tube 6 are installed with solenoid valves 7.

[0023] The working mode of the hot and cold drive is to introduce the heat source from the inlet of the heat exchange tube 6 into the heat exchange tube 6, so that the heat source flows inside the heat exchange tube 6 and exchanges heat with the gas inside the heat exchange box 2. The heat source after heat exchange is discharged from the outlet of the heat exchange tube 6. After the heat exchange between the gas and the heat source, the temperature rises and the gas expands, which increases the pressure at the bottom of the inner cavity of the heat exchange box 2 (the pressure will overcome the elastic force of the elastic member 5), and pushes the moving member 4 and the plug rod upward (the elastic member 5 will be compressed at this time), so that the piston 3 moves upward; then the cold source is introduced from the inlet of the heat exchange tube 6 into the heat exchange tube 6. Tube 6, so that the cold source flows inside the heat exchange tube 6 and exchanges heat with the gas inside the heat exchange box 2. The cold source after heat exchange is discharged from the outlet of the heat exchange tube 6. After the heat exchange between the gas and the cold source, the temperature drops and shrinkage occurs, so that the air pressure at the bottom of the inner cavity of the heat exchange box 2 is reduced. Under the elastic force of the elastic member 5, the moving member 4 moves downward with the plug rod, so that the piston 3 moves downward; repeat the above operation, and introduce the heat source and the cold source into the interior of the heat exchange tube 6 in turn, so that the piston 3 moves back and forth in the pressurizing pump head 1, so as to achieve the goal of pressurizing the working fluid and provide power for fluid transportation.

[0024] It should be noted that the temperature difference between the heat source and the cold source is 100°C.

[0025] Example 2

[0026] As a further optimized solution of Example 1, please refer to Figure 2 , a heat-driven absorption refrigeration device, comprising: a generator, a condenser, an evaporator, an absorber, a liquid ammonia pressure reducing valve, a working fluid pressure reducing valve and a cold and hot driver, wherein the cold and hot driver is a cold and hot driver mentioned in Example 1;

[0027] Among them, the shell of the generator is provided with a gas ammonia outlet, a working fluid outlet and a working fluid inlet, and hot water flows in the tube side of the generator; the shell of the condenser is provided with a gas ammonia inlet and a liquid ammonia outlet, the gas ammonia inlet of the condenser is connected with the gas ammonia outlet of the generator, and cooling water flows in the tube side of the condenser; the shell of the evaporator is provided with a liquid ammonia inlet and a gas ammonia outlet, the liquid ammonia inlet of the evaporator is connected with the liquid ammonia outlet of the condenser, and a liquid ammonia pressure reducing valve is provided between the connecting areas, and the tube side of the evaporator is connected with the cold end of the user; the shell of the absorber is provided with a gas ammonia inlet, a working fluid inlet and a working fluid outlet, the gas ammonia inlet of the absorber is connected with the gas ammonia outlet of the evaporator, the working fluid inlet of the absorber is connected with the working fluid outlet of the generator, and a working fluid pressure reducing valve is provided between the connecting areas, the working fluid outlet of the absorber is connected with the working fluid inlet of the generator, and a hot and cold driver is provided between the connecting areas;

[0028] See also Figure 1 and Figure 2The inlet of the booster pump head 1 is connected with the working fluid outlet of the absorber, and the outlet of the booster pump head 1 is connected with the working fluid inlet of the generator; the inlet of the heat exchange tube 6 is connected with the hot water outlet of the generator and the cooling water outlet of the absorber respectively; solenoid valves 7 are provided between the inlet of the heat exchange tube 6 and the connecting areas with the hot water outlet of the generator and the cooling water outlet of the absorber, and a solenoid valve 7 is provided on the outlet of the heat exchange tube 6, and a logical interlock is established between the multiple solenoid valves 7, so that the multiple solenoid valves 7 can be intelligently controlled and have a certain logical order.

[0029] It should be noted that the corresponding solenoid valves 7 need to be opened at the inlets and outlets of the heat source and the cold source; the cold and hot source media are used to flow and exchange heat in a limited and enclosed space (heat exchange box 2) to achieve the purpose of thermal expansion and contraction of the air in the space, thereby giving a driving force to drive the piston 3 to do reciprocating motion, thereby achieving the goal of pressurizing the working fluid, and reusing the heat source after heat exchange in the generator and the cold source after heat exchange in the absorber, thereby improving energy utilization and achieving a more energy-saving purpose.

[0030] The working principle of the heat-driven absorption refrigeration device is as follows: the working medium containing ammonia (rich liquid) exchanges heat with hot water in the generator, and the ammonia in the working medium is evaporated (ammonia is converted from liquid to gaseous). The working medium without ammonia (lean liquid) is depressurized by the working medium pressure reducing valve and enters the absorber. The gaseous ammonia enters the condenser and is cooled by cooling water to form liquid ammonia. The liquid ammonia is depressurized by the liquid ammonia pressure reducing valve and enters the evaporator, and exchanges heat with the medium input from the user's cold end, cooling the medium at the user's cold end and providing a cold source for the user. The liquid ammonia absorbs the heat of the medium. After being measured, it becomes gaseous ammonia and is introduced into the absorber to mix with the working fluid (lean liquid) to form ammonia-containing working fluid (rich liquid), and heat is exchanged with cooling water. The working fluid (rich liquid) is input into the generator through the hot and cold drive for circulation; during the operation of the hot and cold drive, the heat source after heat exchange in the generator and the cold source after heat exchange in the absorber are reused, so that the hot and cold source medium flows and exchanges heat in a limited and closed space (heat exchange box 2), so as to achieve the purpose of thermal expansion and contraction of the air in the space, thereby giving driving force to drive the piston 3 to do reciprocating motion, and achieving the goal of pressurizing the working fluid;

[0031] The working mode of the hot and cold driver in the heat-driven absorption refrigeration device is as follows: the heat source (i.e., hot water) after heat exchange in the generator is introduced into the heat exchange tube 6 from the inlet of the heat exchange tube 6, so that the heat source flows inside the heat exchange tube 6 and exchanges heat with the gas inside the heat exchange box 2. The heat source after heat exchange is discharged from the outlet of the heat exchange tube 6. After the heat exchange between the gas and the heat source, the temperature rises and the gas expands, which increases the pressure at the bottom of the inner cavity of the heat exchange box 2 (the pressure will overcome the elastic force of the elastic member 5), and the moving member 4 and the plug rod are pushed upward (the elastic member 5 will be compressed at this time), so that the piston 3 moves upward; then the cold source after heat exchange in the absorber ( That is, cooling water) is introduced into the heat exchange tube 6 from the inlet, so that the cold source flows inside the heat exchange tube 6 and exchanges heat with the gas inside the heat exchange box 2. The cold source after heat exchange is discharged from the outlet of the heat exchange tube 6. After the heat exchange between the gas and the cold source, the temperature drops and shrinkage occurs, so that the air pressure at the bottom of the inner cavity of the heat exchange box 2 is reduced. Under the elastic force of the elastic member 5, the moving member 4 moves downward with the plug rod, so that the piston 3 moves downward; repeat the above operation, and introduce the heat source and the cold source into the interior of the heat exchange tube 6 in turn, so that the piston 3 moves back and forth in the pressurizing pump head 1, so as to achieve the goal of pressurizing the working fluid and provide power for the working fluid to return from the absorber to the generator.

[0032] It should be noted that replacing the working fluid pump in the traditional heat-driven absorption refrigeration device with a hot and cold driver can reduce the device's dependence on and consumption of electrical energy, which is conducive to reducing energy utilization and achieving a more environmentally friendly goal.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot and cold driver, characterized in that: It comprises a pressurizing pump head (1) and a heat exchange box (2), wherein a reciprocating component is provided between the pressurizing pump head (1) and the heat exchange box (2); The reciprocating component is used to utilize the thermal expansion and contraction generated during the heat exchange process of the cold and hot source media inside the heat exchange box (2) to provide pumping force for the pressurizing pump head (1).

2. A hot and cold driver according to claim 1, characterized in that: The reciprocating assembly comprises a piston (3) slidably arranged in a pressurizing pump head (1) and a moving part (4) slidably arranged in a heat exchange box (2); a plug rod is arranged between the moving part (4) and the piston (3); an elastic part (5) for driving the plug rod to reset is arranged in the heat exchange box (2); a heat exchange tube (6) is arranged in the heat exchange box (2); an inlet and outlet for fluid to pass through is arranged on the pressurizing pump head (1); and the heat exchange box (2) is filled with gas for contacting the heat exchange tube (6).

3. A hot and cold driver according to claim 2, characterized in that: Solenoid valves (7) are provided at the inlet and outlet of the heat exchange tube (6).

4. A heat-driven absorption refrigeration device comprising: Generator, condenser, evaporator, absorber and hot and cold driver, characterized in that: the hot and cold driver is a hot and cold driver as described in any one of claims 1 to 3, wherein the cold source entering the heat exchange box (2) is the cooling medium coming out of the absorber, and the heat source is the hot flow medium coming out of the generator.

5. A heat-driven absorption refrigeration device according to claim 4, characterized in that: The inlet of the pressurizing pump head (1) is connected to the working fluid outlet of the absorber, and the outlet of the pressurizing pump head (1) is connected to the working fluid inlet of the generator.

6. A heat-driven absorption refrigeration device according to claim 4, characterized in that: The inlet of the heat exchange tube (6) is respectively connected to the hot water outlet of the generator and the cooling water outlet of the absorber.

7. A heat-driven absorption refrigeration device according to claim 4, characterized in that: A liquid ammonia pressure reducing valve is arranged between the liquid ammonia outlet of the condenser and the liquid ammonia inlet of the evaporator.

8. A heat-driven absorption refrigeration device according to claim 4, characterized in that: A working fluid pressure reducing valve is arranged between the working fluid outlet of the generator and the working fluid inlet of the absorber.

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