Heat insulation device for reducing heat transfer loss in absorption heat exchanger

Abstract

The utility model discloses a heat insulation device for reducing heat transfer loss in an absorption heat exchanger, which comprises the absorption heat exchanger, heat insulation layers are arranged between a generator and a condenser of the absorption heat exchanger and between the generator and an evaporator, the height of each heat insulation layer is 30mm, and the surface of a steel plate in each heat insulation layer needs to be aluminized. The aluminized film formed on the surface of the steel plate can reduce the radiation heat transfer amount. A vacuum diaphragm valve is mounted on each heat insulation layer, and after the absorption heat exchanger is produced and manufactured and before the absorption heat exchanger runs, air in the heat insulation layers is pumped out through a vacuum pump, so that a vacuum heat insulation layer is formed. The vacuum heat insulation layer can prevent a high-temperature generator in the absorption type heat exchanger from transferring heat to a low-temperature condenser and a low-temperature evaporator.

Description

Technical Field

[0001] This utility model belongs to the technical field of absorption heat exchangers, and in particular relates to a heat insulation device for reducing heat transfer loss inside an absorption heat exchanger. Background Technology

[0002] An absorption heat exchanger is a heating technology device based on an absorption cycle, which has begun to be widely used in urban centralized heating systems. An absorption heat exchanger consists of a generator, condenser, evaporator, and absorber; the flow path for high-temperature hot water is generator-evaporator, while the flow path for low-temperature hot water in the heating network is absorber-condenser. The generator is separated from the condenser and evaporator only by a single steel plate. During operation, the high temperature of the hot water flowing into the generator and the relatively low temperature of the condenser and evaporator lead to heat exchange at the contact points, resulting in high-temperature energy loss and reduced heat exchange function and efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a heat insulation device that reduces heat transfer loss inside an absorption heat exchanger. It effectively solves the problem of heat transfer between the high-temperature generator and the low-temperature condenser and evaporator, and improves the heat exchange effect of the absorption heat exchanger.

[0004] The technical solution adopted by this utility model is: a heat insulation device to reduce heat transfer loss inside an absorption heat exchanger, which includes adding a heat insulation plate between the generator and the condenser and evaporator to form a heat insulation layer, installing a diaphragm valve on the cavity of the heat insulation layer, and the absorption heat exchanger having an automatic vacuum system device, connecting the diaphragm valve of the heat insulation layer to the automatic vacuum system device, thereby forming a vacuum layer inside the heat insulation layer.

[0005] Inside the generator, the lithium bromide solution and high-temperature hot water generally flow in counter-current fashion. The high-temperature hot water flows inside the heat exchange tubes, while the lithium bromide solution is distributed as a falling film outside the tubes. After sufficient heat exchange, the lithium bromide solution collects at the generator's base plate and flows into the absorber through pipes. If the generator and condenser or evaporator are only insulated by a single steel plate, heat will be transferred between the two sides with different temperatures. Adding an insulation layer between the generator and condenser, or between the generator and evaporator, prevents direct contact between the media with different temperatures. A vacuum diaphragm valve is installed in the cavity of the insulation layer, and the air inside the insulation layer is extracted using the vacuum pump of the absorption heat exchanger. A further optimized design for this insulation layer has the advantage of fully utilizing the high vacuum of the insulation layer to reduce heat exchange between the generator and the condenser / evaporator.

[0006] Furthermore, reflective material is added to the surface of the plate inside the insulation layer, and aluminum is plated on the surface of the plate inside the insulation layer to form a thin film. The insulation layer is 30 mm high, and its width and length are related to the body size of the absorption heat pump heat exchanger.

[0007] A vacuum barrier can reduce heat transfer. Heat transfer mainly occurs through three mechanisms: conduction, convection, and radiation. A vacuum barrier inhibits all three of these heat transfer mechanisms. Compared with existing technologies, the advantages of this invention are:

[0008] (1) Suppressing heat conduction: Heat conduction requires a medium to transfer heat, but there is almost no medium such as air in the vacuum layer and very few gas molecules, which greatly reduces the path of heat conduction and thus effectively reduces the efficiency of heat conduction.

[0009] (2) Preventing heat convection: Heat convection relies on the macroscopic flow of fluid to transfer heat. In a vacuum environment, there is no fluid, so heat convection cannot be formed, thus preventing heat from being transferred through convection.

[0010] (3) Reduce heat radiation: Although a vacuum cannot completely block heat radiation, most of the heat radiation can be reflected back by adding reflective materials, such as aluminum-plated thin films, to the surface of the partition, thereby reducing the transfer of heat through radiation. Attached Figure Description

[0011] Figure 1 A three-dimensional structural diagram of a heat insulation device for reducing heat transfer loss inside an absorption heat exchanger, based on this utility model.

[0012] Figure 2 This is a schematic diagram of a heat insulation device for reducing heat transfer loss inside an absorption heat exchanger according to the present invention.

[0013] Figure 1 In the middle: 1-Condenser, 2-Vacuum insulation layer, 3-Generator liquid inlet pipe, 4-Generator liquid distribution tank, 5-Evaporation pipe, 6-Vacuum diaphragm valve, 7-Vacuum diaphragm valve, 8-Vacuum diaphragm valve, 9-Generator, 10-Vacuum insulation layer, 11-Evaporator liquid inlet pipe, 12-Evaporator liquid distribution tank, 13-Evaporator, 14-Steam passage jacket, 15-Condenser heat exchange tube, 16-Condenser bottom plate, 17-Generator top plate, 18-Generator spray plate, 19-Generator baffle plate, 20-Generator bottom plate, 21-Evaporator top plate, 22-Evaporator spray plate;

[0014] Figure 2 In the middle: 1-vacuum insulation layer, 2-insulation layer top plate, 3-aluminum-coated film, 4-extraction pipe Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, a heat insulation device for reducing heat transfer loss inside an absorption heat exchanger includes a generator 9, with a heat insulation layer 2 on top and a heat insulation layer 10 below. Before the absorption heat exchanger is manufactured and put into operation, vacuum diaphragm valves 6, 7, and 8 are fully opened. Vacuum diaphragm valve 7 is connected to a vacuum pump or the vacuum system built into the absorption heat exchanger itself, so that the air inside the heat insulation layer 2 and the heat insulation layer 10 is evacuated, forming a vacuum insulation layer. The surfaces of the condenser bottom plate 16, the generator top plate 17, the generator bottom plate 20, and the evaporator top plate 21 are coated with an aluminum-plated thin film.

[0017] The above specific embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A heat insulation device for reducing heat transfer loss inside an absorption heat exchanger, comprising an absorption heat exchanger, wherein a condenser is disposed above the absorption heat exchanger and an evaporator is disposed below the absorption heat exchanger, characterized in that: A heat insulation layer is installed between the generator and the condenser, and another heat insulation layer is installed between the generator and the evaporator. The heat insulation layer is 30 mm high, and the steel plate inside the heat insulation layer needs to be aluminum-plated to form an aluminum-plated film.

2. The heat insulation device for reducing heat transfer loss inside an absorption heat exchanger according to claim 1, characterized in that: One vacuum diaphragm valve is installed on each insulation layer by welding. The outlet pipes of the two vacuum diaphragm valves are connected to a main pipe, and another vacuum diaphragm valve is installed on the main pipe by welding.

3. The heat insulation device for reducing heat transfer loss inside an absorption heat exchanger according to claim 2, characterized in that: The outlet section of the vacuum diaphragm valve on the main pipe needs to be connected to the automatic vacuum system piping of the absorption heat exchanger.

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