CN106288491A - Absorption refrigeration unit and absorption refrigeration matrix - Google Patents

Abstract

The invention relates to an absorption refrigerating machine, and specifically discloses an absorption refrigerating unit. The regenerator, absorber, condenser and evaporator of the absorption refrigeration unit are shell-and-tube heat exchangers, including the shell side formed by the shell-and-tube heat exchanger shell, and the shell-and-tube heat exchanger shell composed of The tube side composed of heat exchange tubes; the heat exchange tubes are made of plastic; the solution heat exchanger of the absorption refrigeration unit is a plate heat exchanger, and the plate heat exchanger has a plate heat exchanger shell and a heat exchange wall plate; The heat exchange wall plate is fixed in the shell of the plate heat exchanger, and the heat exchange wall plate is made of plastic. The weight of the whole machine of the invention can be greatly reduced. At the same time, the corrosion resistance of the plastic is stronger, and it can avoid being corroded by the solution to produce non-condensable gas, which increases the working efficiency of the absorption refrigerator. Plastic is easy to seal, which can effectively reduce the difficulty of sealing. It is not only suitable for high-power applications, but also suitable for households and commercial occasions that require less power. The invention also discloses an absorption refrigeration matrix.

Description

Absorption refrigeration unit and absorption refrigeration matrix

technical field

The invention relates to the technical field of refrigeration equipment, in particular to an absorption refrigerator.

Background technique

Absorption refrigerator, which uses a binary solution as a working medium, in which the low-boiling point component is used as a refrigerant, that is, it is used for refrigeration by its evaporation; the high-boiling point component is used as an absorbent, that is, it is used to absorb the refrigerant vapor. Complete the work cycle. For example, the lithium bromide absorption refrigerator uses pure water as the refrigerant, that is, relies on the evaporation and heat absorption of pure water in a high vacuum environment to realize the refrigeration function. After absorbing heat and evaporating, the refrigerant vapor is absorbed by the lithium bromide solution, transported, heated and regenerated, condensed, and after returning to liquid state, it absorbs heat and evaporates again, and the refrigeration cycle is continuously carried out.

Limited by the physical and chemical properties of pure water, the evaporation temperature of the evaporator is generally set at about 5°C, and the saturation pressure is about 872Pa. This high vacuum environment requires high airtightness of the refrigerator. Traditionally, the heat exchanger inside the absorption refrigerator uses copper tubes with a diameter of more than 16mm as an array, and copper plates as heat exchange panels, so it faces complex sealing problems with other components, and production efficiency is restricted. At the same time, this also leads to a large overall weight of the absorption refrigerating machine, making it difficult to reduce the weight of the absorption refrigerating machine. The metal is easily corroded by the solution, and produces non-condensable gases such as hydrogen, which reduces the working efficiency of the absorption refrigerator.

Due to the use of non-ferrous metal materials and mechanical processing methods, traditional absorption refrigerators are generally bulky and heavy, have poor corrosion resistance, and require professional maintenance. Generally, they cannot be used in households and commercial occasions that require less power.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an absorption refrigeration unit, the heat exchange tubes and heat exchange wall plates are made of plastic, so that the absorption refrigeration unit can Achieve light weight and miniaturization. At the same time, the heat exchange tube and the heat exchange wall plate made of plastic are easy to seal and improve the production efficiency. The plastic has strong corrosion resistance, can avoid non-condensable gas, and increases the working efficiency of the absorption refrigerator. Such an absorption refrigeration unit is not only suitable for high-power applications, but also suitable for households and commercial occasions that require less power.

The second object of the present invention is to provide an absorption refrigeration matrix, which is composed of several above-mentioned absorption refrigeration units.

Embodiments of the invention are achieved through the following technical solutions:

Absorption Refrigeration Unit An absorption refrigeration unit is an absorption chiller.

The regenerator, absorber, condenser and evaporator of the absorption refrigeration unit are shell-and-tube heat exchangers, including the shell side composed of the shell-and-tube heat exchanger shell, and the shell-and-tube heat exchanger shell composed of The tube side composed of heat exchange tubes; the heat exchange tubes are made of plastic.

The solution heat exchanger of the absorption refrigeration unit is a plate heat exchanger, and the plate heat exchanger has a plate heat exchanger shell and a heat exchange wall plate; the heat exchange wall plate is fixed in the plate heat exchanger shell, and the heat exchange wall plate is composed of Made of plastic.

The inventors have found through research that in the absorption refrigerator, in order to improve the heat transfer performance, the heat exchange tubes in the condenser, evaporator, absorber and regenerator are made of metal materials with relatively high heat transfer coefficients. The heat exchange wall plates of the solution heat exchanger are also made of metal materials. However, the metal material has a high density, resulting in a large overall weight of the absorption refrigerator. In addition, metal heat exchange tubes and heat exchange wall plates are corroded by the solution to produce non-condensable gas, which affects the working efficiency of the absorption refrigerator, and the sealing process requires high requirements and high sealing costs. Compared to metal materials, plastics have a lower density. The weight of plastic is much lower than that of metal materials (such as brass) under the same volume. For this reason, the inventors made the heat exchange tubes and heat exchange wall plates in the absorption refrigerating machine from plastics. In the absorption refrigeration unit provided by the embodiment of the present invention, the weight of the whole machine can be greatly reduced. Heat exchange tubes and heat exchange wall plates made of plastic are easy to seal. The corrosion resistance of the plastic is stronger, and it can avoid being corroded by the solution to produce non-condensable gas, which increases the working efficiency of the absorption refrigerator. Such an absorption refrigeration unit is suitable for households and commercial occasions requiring less power.

In one embodiment of the present invention, the tube wall thickness of the heat exchange tube is 0.1-0.5 mm.

In one embodiment of the present invention, the wall thickness of the heat exchange tube is 0.15 mm.

In one embodiment of the present invention, several rows of heat exchange tubes are arranged in upper and lower layers; a plurality of support bars are arranged at intervals between two adjacent rows of heat exchange tubes; the support bars are used to support two adjacent rows of heat exchange tubes.

In one embodiment of the invention, the support bars are made of plastic.

In one embodiment of the present invention, the support bar and the heat exchange tube are made of the same plastic.

In one embodiment of the present invention, several rows of heat exchange tubes are arranged in upper and lower layers; the outer diameter of the heat exchange tubes is 3 mm to 5 mm. The center-to-center distance between adjacent heat exchange tubes in the same row is 4 mm to 6 mm. The center distance between the upper and lower adjacent heat exchange tubes is 5 mm to 8 mm.

In one embodiment of the present invention, the outer diameter of the heat exchange tube is 3 mm. The center-to-center distance between adjacent heat exchange tubes in the same row is 4mm. The center-to-center distance between the upper and lower adjacent heat exchange tubes is 7 mm.

In one embodiment of the invention, the shell and tube heat exchanger housing is made of plastic.

In one embodiment of the present invention, the shell and the heat exchange tubes of the shell-and-tube heat exchanger are made of the same plastic.

In one embodiment of the present invention, the thickness of the heat exchange wall plate is 0.1mm-0.5mm.

In one embodiment of the present invention, the thickness of the heat exchange wall plate is 0.15mm.

In one embodiment of the present invention, textured ribs are distributed on the heat exchanging wall plate for supporting the heat exchanging wall plate and making the fluid flowing through the ribs turbulent to improve the heat transfer coefficient.

In one embodiment of the invention, the ribs are made of plastic.

In one embodiment of the present invention, the ribs and the heat exchange wall are made of the same plastic.

In one embodiment of the present invention, the heat exchange wall plates are arranged in multiple layers. The distance between the heat exchange wall panels of two adjacent layers is 0.5 mm to 3 mm.

In one embodiment of the present invention, the distance between the heat exchange wall plates of two adjacent layers is 1mm.

In one embodiment of the invention, the plate heat exchanger housing is made of plastic.

In one embodiment of the present invention, the shell of the plate heat exchanger and the heat exchange wall are made of the same plastic.

In one embodiment of the invention, the body shell of the absorption refrigeration unit is made of plastic.

In one embodiment of the present invention, the absorption refrigeration unit has several water flow ports for leading in and out cold water, hot water and cooling water; the water flow ports are made of plastic.

In one embodiment of the invention, the components of the absorption refrigeration unit are all made of plastic.

In one embodiment of the present invention, the absorption refrigerating unit is provided with at least two groups of water flow interface groups, and each group of water flow interface groups at least includes water flow interfaces serving as inlets and outlets of hot water, and water flow interfaces serving as inlets and outlets of cold water. , as the water flow interface of the inlet and outlet of cooling water. Adjacent absorption refrigeration units can be connected to each other through the water flow interface, so that any number of absorption refrigeration units can be plugged with each other through the water flow interface to form an absorption refrigeration matrix.

In one embodiment of the present invention, the absorption refrigeration unit has at least two combination surfaces; each group of water flow interface groups is distributed on the combination surfaces.

In one embodiment of the present invention, the body shell of the absorption refrigeration unit is a cuboid, and the combination surfaces are six surfaces of the body shell. Each combined surface is provided with a group of water flow interface groups. Adjacent absorption refrigeration units can be connected to each other through the water flow interface, so that any number of absorption refrigeration units can be plugged with each other through the water flow interface to form a matrix absorption refrigeration matrix.

In one embodiment of the present invention, the combined surface of the absorption refrigeration unit is used to be closely attached to the combined surface of the adjacent absorption refrigeration unit, so as to form a matrix absorption refrigeration matrix.

In an embodiment of the present invention, the water flow ports on at least one set of opposite combination surfaces are mirror images of each other.

In one embodiment of the present invention, the body casing of the absorption refrigeration unit is provided with a water flow pipeline system, which connects the water flow interfaces with the same function in different water flow interface groups; the water flow pipeline system is also connected with the pipe The tube-side connection of the shell heat exchanger enables the absorption refrigeration unit to introduce hot water, cold water and cooling water simultaneously or separately through any water flow interface group.

In one embodiment of the present invention, the water flow piping system forms an integral structure with the fuselage shell.

In one embodiment of the present invention, the water flow pipeline system includes a hot water inlet pipeline, a hot water outlet pipeline, a cold water inlet pipeline, a cold water outlet pipeline, a cooling water inlet pipeline, and a cooling water outlet pipeline.

The hot water inlet pipe is connected to the hot water inlet and the inlet of the tube side of the regenerator.

The hot water outlet pipe is connected to the hot water outlet and the outlet of the tube side of the regenerator.

The cold water inlet pipe is connected with the cold water inlet and the inlet of the tube side of the evaporator.

The cold water outlet pipe is connected to the outlet of the cold water outlet and the tube side of the evaporator.

The cooling water inlet pipe is connected to the inlet of the cooling water and the inlets of the tube side of the absorber and the condenser.

The cooling water outlet pipe is connected to the cooling water outlet and the outlet of the tube side of the absorber and the condenser.

In one embodiment of the invention, the regenerator and condenser are located in the upper part of the body shell of the absorption refrigeration unit, wherein,

The regenerator is used to heat and evaporate the refrigerant water absorbed in the dilute solution to obtain refrigerant vapor; the heat absorbed during the evaporation process is provided by the hot water in the tube side of the regenerator.

The condenser is used to cool and condense the refrigerant steam obtained in the regenerator into refrigerant water, and the refrigerant water flows to the shell side of the evaporator after throttling.

In one embodiment of the invention, the evaporator and absorber are located in the lower part of the body shell of the absorption refrigeration unit, wherein,

The evaporator is used to absorb heat by evaporating the refrigerant water on the shell side to cool down the cold water in the tube side;

The absorber is used to absorb the refrigerant vapor generated in the shell side of the evaporator into the concentrated solution, and the heat released during the absorption process is taken away by the cooling water in the tube side.

In one embodiment of the present invention, the absorption refrigeration unit further includes a solution tank; the solution tank is used to recover the dilute solution produced in the absorber and provide the required dilute solution for the regenerator.

In one embodiment of the invention, the solution tank is made of plastic.

Absorption refrigeration matrix, including a plurality of absorption refrigeration units of any one of the above.

The technical solution of the present invention has at least the following advantages and beneficial effects:

In the absorption refrigeration unit provided by the embodiment of the present invention, the heat exchange tube and the heat exchange wall plate are made of plastic. The weight of the whole machine can be greatly reduced. Heat exchange tubes and heat exchange wall plates made of plastic are easy to seal. The corrosion resistance of the plastic is stronger, and it can avoid being corroded by the solution to produce non-condensable gas, which increases the working efficiency of the absorption refrigerator. Such an absorption refrigeration unit is suitable for households and commercial occasions requiring less power.

Further, the absorption refrigeration matrix provided by the embodiment of the present invention has the beneficial effects of low weight, easy sealing, stronger corrosion resistance and high working efficiency due to the above-mentioned absorption refrigeration unit.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings that need to be used in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate some embodiments of the present invention, and should not be considered as limiting the scope of the present invention. Those skilled in the art can obtain other drawings based on these drawings without creative effort.

Fig. 1 is the schematic diagram of the three-dimensional structure of the absorption refrigeration unit in the embodiment of the present invention;

Fig. 2 is a schematic diagram of an assembly explosion of an absorption refrigeration unit in an embodiment of the present invention;

Fig. 3A is a schematic diagram of the three-dimensional structure of the condenser and one side regenerator in the embodiment of the present invention;

Fig. 3B is a cross-sectional structural schematic diagram of a condenser and a side regenerator in an embodiment of the present invention;

Fig. 4A is a schematic diagram of a three-dimensional installation structure of a solution heat exchanger in an embodiment of the present invention;

Fig. 4B is a schematic structural view of the exposed heat exchange wall plate after removing some parts of the solution heat exchanger in the embodiment of the present invention;

Fig. 5 is a schematic diagram of an absorption refrigeration matrix formed by direct splicing of six absorption refrigeration units in an embodiment of the present invention.

Among them, the names of parts corresponding to the reference signs are as follows:

absorption refrigeration unit 100;

Upper combination surface 110;

Lower combination surface 130;

Left composite surface 120;

Right composite surface 140;

Hot water inlet 111, 121;

Hot water outlet 112, 122;

Cold water inlet 113, 123;

Cold water outlets 114, 124;

Cooling water inlet 115, 125;

Cooling water outlets 116, 126;

solution heat exchanger 135;

regenerator 201;

condenser 202;

Absorber 203;

evaporator 204;

Hot water inlet pipes 211, 221;

Hot water outlet pipes 212, 222;

Cold water inlet pipes 213, 223;

Cold water outlet pipes 214, 224;

Cooling water inlet pipes 215, 225;

Cooling water outlet pipes 216, 226;

Solution pump 231;

solution tank 232;

Shell and tube heat exchanger 300;

Support bar 301

Heat exchange tube 310;

solution dispenser 321,

shell and tube heat exchanger housing 322;

Drain holes 340;

Dilute solution inlet 401;

concentrated solution outlet 402;

Concentrated solution goes to channel 404 on the shell side of the absorber;

concentrated solution inlet 406;

dilute solution outlet 408;

The dilute solution goes to the channel 409 of the regenerator;

dilute solution channel 412;

concentrated solution channel 414;

Heat exchange wall plate 420;

Rib 422;

Plate heat exchanger shell 424;

Absorption refrigeration matrix 500;

Absorption refrigeration units 501, 502, 503, 504, 505, 506;

hot water inlet 511;

Hot water outlet 512;

cold water inlet 513;

Cold water outlet 514;

cooling water inlet 515;

Cooling water outlet 516.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, not all, embodiments of the present invention.

Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right" etc. is based on the orientation or positional relationship shown in the drawings, or is the The orientation or positional relationship that is usually placed when the inventive product is used, or the orientation or positional relationship that is commonly understood by those skilled in the art, such terms are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

Example:

The heat exchanger inside the traditional absorption refrigerator uses copper tubes with a diameter of more than 16mm as an array, so it faces complicated sealing problems with other components, and the production efficiency is restricted. At the same time, this also leads to a large overall weight of the absorption refrigerating machine, making it difficult to reduce the weight of the absorption refrigerating machine. The metal is easily corroded by the solution, and produces non-condensable gases such as hydrogen, which reduces the working efficiency of the absorption refrigerator.

Due to the use of non-ferrous metal materials and mechanical processing methods, traditional absorption refrigerators are generally bulky and heavy, have poor corrosion resistance, and require professional maintenance. Generally, they cannot be used in households and commercial occasions that require less power.

Therefore, this embodiment provides an absorption refrigeration unit, which is an absorption refrigeration machine, and its heat exchange tubes and heat exchange wall plates are made of plastic. The heat exchange tubes are thin-walled tubes, and the heat exchange wall plates are thin-walled plates, so that the absorption refrigeration unit can be lightweight and miniaturized on the premise of satisfying the heat exchange performance. At the same time, the heat exchange tube and the heat exchange wall plate made of plastic are easy to seal, and can be integrally formed with other plastic parts by precision injection molding process, which improves the production efficiency. The plastic has strong corrosion resistance and can avoid non-condensable gas, which increases the working efficiency of the absorption refrigeration unit and reduces the frequency of maintenance. Such an absorption refrigeration unit is suitable for households and commercial occasions requiring less power due to its light weight, miniaturization, and maintenance frequency characteristics.

The absorption refrigeration unit provided in this embodiment can also form a large-scale absorption refrigeration matrix through the water flow interface group, and its expansibility is strong. Furthermore, only standardized absorption refrigeration units need to be produced, and multiple absorption refrigeration units can be combined according to needs during use, which greatly improves production efficiency and reduces manufacturing costs and production cycles.

In this embodiment, the so-called plastic refers to engineering plastics (engineering-plastics), such as polycarbonate (Polycarbonate, PC), polyamide (nylon, Polyamide, PA), polyoxymethylene (Polyacetal, PolyoxyMethylene, POM), polyphenylene Ether (Polyphenylene Oxide, PPO), polyester (PET, PBT), polyphenylene sulfide (Polyphenylene Sulfide, PPS), polyaryl ester, etc.

In this embodiment, an absorption refrigeration unit using lithium bromide solution and refrigerant water as working fluids is taken as an example for illustration.

Referring to FIG. 1 , FIG. 1 is a schematic perspective view of the three-dimensional structure of an absorption refrigeration unit 100 provided in this embodiment. The absorption refrigeration unit 100 is an absorption refrigeration machine whose shape is a cuboid. As an example, the cooling power of the absorption refrigeration unit 100 is 3RT (about 11kW), and the volume of the main unit is only 840×400×200 (mm3), which is less than 0.1 cubic meters. It is processed by precision injection molding. There are heat exchange components such as regenerator, evaporator, absorber and condenser inside.

The absorption refrigeration unit 100 uses lithium bromide solution + refrigerant water as the working medium, and relies on the evaporation and heat absorption of the refrigerant water in a high-vacuum environment to achieve refrigeration. After the refrigerant water absorbs heat, it evaporates and becomes refrigerant vapor. The refrigerant vapor no longer has the ability to absorb heat through phase change, so it must be absorbed by the lithium bromide solution, and then heated and regenerated with the lithium bromide solution to generate refrigerant vapor. The refrigerant vapor is condensed and turned back into liquid refrigerant water to absorb heat and evaporate again. The refrigerant water absorbs heat and evaporates—absorbs—regenerates—condenses—and then absorbs heat and evaporates, so that the refrigeration cycle continues continuously. Among them, cold water, hot water and cooling water exchange heat between the evaporator, regenerator, absorber and condenser to complete the refrigeration process. The absorption refrigeration unit 100 obtains energy from the outside through hot water, cooling water and cold water pipes, releases heat to the outside, and supplies cooling to the outside.

The absorption refrigeration unit 100 shown in FIG. 1 also has a water flow piping system, a solution heat exchange and circulation system, thereby forming an independent and complete refrigerator. When it is installed and operated separately, its cooling power is called unit power. At the same time, multiple absorption refrigeration units 100 have the ability to form a large-scale absorption refrigeration matrix through combination, so that the total power becomes the sum of the power of multiple absorption refrigeration units 100 .

In order to adapt to this combination, in this embodiment, a set of water flow interface groups are respectively provided on the four combination surfaces of the absorption refrigeration unit 100 : the upper combination surface 110 , the left combination surface 120 , the lower combination surface 130 and the right combination surface 140 . Each water flow interface group includes a hot water inlet, a hot water outlet, a cold water inlet, a cold water outlet, a cooling water outlet and a cooling water inlet. Take the upper assembly surface 110 and the right assembly surface 140 that can be seen in Fig. 1 as an example: the upper assembly surface 110 is respectively provided with a hot water inlet 111, a hot water outlet 112, a cold water inlet 113, a cold water outlet 114, a cooling water inlet 115 and The cooling water outlet 116 ; the right side surface 140 are respectively provided with a hot water inlet 121 , a hot water outlet 122 , a cold water inlet 123 , a cold water outlet 124 , a cooling water inlet 125 and a cooling water outlet 126 . In fact, on the lower assembly surface 130 opposite to the upper assembly surface 110, there are six identical water flow ports that are mirror-symmetrical to the upper assembly surface 110, and on the left assembly surface 120 (back) opposite to the right assembly surface, a The right combination surface 140 has 6 identical water flow ports in mirror image. This symmetrical design makes it possible for the corresponding water flow ports to be aligned and connected as a whole when the two absorption refrigeration units 100 are combined up and down or left and right.

In fact, at least 2 of the 6 faces of the cuboid absorption refrigeration unit 100 can be set as combination surfaces, and each combination surface is provided with a group of water flow interfaces for connecting with the adjacent absorption refrigeration unit (or the outside world) energy medium) connected. Each water flow interface group includes 6 water flow interfaces. In actual use, according to the actual situation, four of the water flow interfaces or other numbers of water flow interfaces may be used as a group of water flow interfaces to be arranged on a combined surface.

The cuboid absorption refrigeration unit enables adjacent absorption refrigeration units to be closely attached to each other through the combination surface to form an absorption refrigeration matrix, thereby obtaining a more compact structure. It can be understood that in other specific implementation manners, the absorption refrigeration unit may not adopt a rectangular parallelepiped structure.

Fig. 2 is an exploded schematic diagram of the assembly of the absorption refrigeration unit 100 in the embodiment of the present invention.

In FIG. 2 , the regenerator 201 and the condenser 202 are located at the upper part of the body shell of the absorption refrigeration unit 100 . The regenerator 201 is used to heat and evaporate the refrigerant water absorbed in the dilute solution to obtain refrigerant vapor. The heat absorbed in the evaporation process is provided by the hot water in the tube side of the regenerator 201 . The condenser 202 is used to cool and condense the refrigerant steam obtained in the regenerator 201 into refrigerant water, and the refrigerant water flows to the shell side of the evaporator 204 after throttling. The evaporator 204 and the absorber 203 are located in the lower part of the body shell of the absorption refrigeration unit 100 . The evaporator 204 is used to absorb heat through the evaporation of the refrigerant water on the shell side, so as to reduce the temperature of the cold water on the tube side. The absorber 203 is used to absorb the refrigerant vapor generated at the shell side of the evaporator 204 into the concentrated solution, and the heat released during the absorption process is taken away by the cooling water at the tube side.

In Fig. 2, the upper combination surface 110 of the absorption refrigerating unit is secretly provided with a plurality of water flow pipes formed by the cooperation of the shell wall panels; they are hot water inlet pipe 211, hot water outlet pipe 212, and cold water inlet pipe respectively. 213, cold water outlet pipeline 214, cooling water inlet pipeline 215 and cooling water outlet pipeline 216, and respectively with hot water inlet 111, hot water outlet 112, cold water inlet 113, cold water outlet 114, cooling water inlet 115 and cooling water outlet 116 connected.

Similarly, in Fig. 2, the right combination surface 140 of the absorption refrigeration unit is secretly provided with a plurality of water flow pipes formed by the mutual cooperation of the wall panels of the fuselage shell; respectively hot water inlet pipe 221, hot water outlet pipe 222 , cold water inlet pipe 223 , cold water outlet pipe 224 , cooling water inlet pipe 225 and cooling water outlet pipe 226 . The above-mentioned pipes are respectively connected with the hot water inlet 121 , the hot water outlet 122 , the cold water inlet 123 , the cold water outlet 124 , the cooling water inlet 125 and the cooling water outlet 126 .

The water inlets and outlets on each combination surface are connected to each other through water flow pipes, so that the absorption refrigeration unit 100 can simultaneously or separately introduce hot water, cold water and cooling water from any combination surface.

The absorption refrigeration unit 100 communicates with the external heat source, cold source, cooling water source or the adjacent absorption refrigeration unit 100 through the water flow ports on the four combined surfaces to supply or draw out the water flow, and transfer hot water, cold water and The cooling water is connected to the tube side of each shell-and-tube heat exchanger (regenerator 201 , condenser 202 , evaporator 204 and absorber 203 ) inside the absorption refrigeration unit 100 . The four hot water inlets 111 , 121 , etc. of hot water are connected to the pipe-side inlet of the regenerator 201 through the hot water inlet pipes 211 , 221 built into the four wall panels to provide heat energy for the absorption refrigeration unit 100 . The four cold water inlets 113, 213, etc. of cold water are connected with the tube-side inlet of the evaporator 204 through cold water inlet pipes 213, 223, etc. The four cooling water inlets 115, 125, etc. of the cooling water are connected with the tube-side inlets of the condenser 202 and the absorber 203 through the cooling water inlet pipes 215, 225, etc. Similarly, the four hot water outlets 112, 122, etc. of the hot water are connected to the tube side outlet of the regenerator 201 through the hot water outlet pipes 212, 222, etc. built into the four wall panels. The four cold water outlets 114, 124, etc. of the cold water are connected to the tube side outlet of the evaporator 204 through the cold water outlet pipes 214, 224, etc. built in the four wall panels. The four cooling water outlets 116, 126, etc. of the cooling water are connected with the tube-side outlets of the condenser 202 and the absorber 203 through the cooling water outlet pipes 216, 226, etc. built in the four wall panels. In this way, a complete water flow piping system is formed, and the water flow piping system and the body shell of the absorption refrigeration unit 100 form an integrated structure.

The water flow pipeline system connects the water flow interfaces with the same function in different water flow interface groups; so that the absorption refrigeration unit 100 can simultaneously or separately introduce hot water, cold water and cooling water through any water flow interface group. In this embodiment, the water flow piping system enables the absorption refrigeration unit 100 to simultaneously or separately introduce hot water, cold water and cooling water from any combined surface.

FIG. 4A is a schematic diagram of a three-dimensional installation structure of the solution heat exchanger 135 in an embodiment of the present invention.

The solution heat exchanger 135 is a plate heat exchanger. As shown in FIG. 1 , the solution heat exchanger 135 is disposed in the recessed area of the side wall of the body shell of the absorption refrigeration unit 100 , and is integrated with the refrigeration unit. As shown in FIG. 2 , the solution tank 232 is roughly square, and matches with the internal structure of the lower part of the body shell of the absorption refrigeration unit 100 , so that the entire solution tank 232 is completely matched to the body shell of the absorption refrigeration unit 100 Internally, the volume of the absorption refrigeration unit 100 is made more compact. The solution tank 232 is used to recover the dilute lithium bromide solution produced in the absorber 203 and provide the dilute lithium bromide solution required for the regenerator 201 .

FIG. 4B is a schematic structural diagram of the exposed heat exchange wall plate 420 after removing some parts of the solution heat exchanger 135 in the embodiment of the present invention.

In the solution heat exchanger 135, a plurality of heat exchange wall plates 420 are arranged in multiple layers, and the interior of the plate heat exchanger shell 424 is evenly separated by a plurality of heat exchange wall plates 420 to form channels for the circulation of hot and cold solutions: that is, mutually Dilute solution channel 412 and concentrated solution channel 414 are separated. The low-temperature dilute lithium bromide solution and the high-temperature concentrated lithium bromide solution are in contact with the heat exchange wall plate 420 at the same time, and the heat exchange wall plate 420 becomes a medium for heat exchange between the low-temperature lithium bromide dilute solution and the high-temperature lithium bromide concentrated solution. The four corners of the solution heat exchanger 135 are also respectively provided with inlets and outlets of the solution channel, which are respectively: the concentrated solution inlet 406 in the upper left corner, the concentrated solution outlet 402 in the lower left corner, the dilute solution inlet 401 in the lower right corner, and the dilute solution inlet 401 in the upper left corner. Solution outlet 408 .

Also visible in FIG. 4B is the solution pump 231 , the channel 404 for the concentrated solution to the shell side of the absorber 203 and the channel 409 for the dilute solution to the regenerator 201 . The solution pump 231 is used to provide power to the dilute solution flowing in the solution heat exchanger 135, pump it from the dilute solution inlet 401 in the lower right corner to the dilute solution outlet 408 in the upper left corner, and deliver it to the regenerator 201 through the connecting pipe. solution dispenser (not shown on the figure).

As shown in FIG. 4B , the surface of the heat exchange wall plate 420 is punched and formed with densely distributed, vertically and horizontally alternate textured ridges 422 . The textured ridges 422 are used to support the heat exchange wall plate 420 to withstand The pressure generated by the vacuum simultaneously causes the fluid flowing through the protruding strips 422 to generate turbulent flow, so as to improve the heat transfer coefficient.

In the solution heat exchanger 135, the heat exchange wall plate 420 is made of plastic, and the thickness of the heat exchange wall plate 420 is 0.1mm˜0.5mm. In this embodiment, the thickness of the heat exchange wall plate 420 is 0.15 mm. Compared with the metal heat exchange wall plate, such an extremely thin thickness makes up for the insufficient heat transfer performance of the plastic, so that the heat transfer performance of the heat exchange wall plate 420 can meet the requirements of the absorption refrigerator. Since the heat exchanging wall plate 420 is made of plastic, the weight of the solution heat exchanger 135 can be greatly reduced compared with the metal heat exchanging wall plate, thereby achieving light weight. Due to the excellent anti-corrosion performance of the plastic, it is also possible to avoid the generation of non-condensable gas due to the corrosion of the heat exchange wall plate 420, thereby increasing the working efficiency of the absorption refrigerating machine. At the same time, the heat exchange wall plate 420 made of plastic is easier to seal than the metal heat exchange wall plate.

After research, the inventor found that the traditional solution heat exchanger using metal heat exchange wall plates is difficult to seal the metal. In order to ensure the sealing performance of the solution heat exchanger, the shell can only be made of thick steel plates or castings. As a result, the weight of the solution heat exchanger is further increased, and the corrosion resistance is poor.

For this reason, in this embodiment, the plate heat exchanger housing 424 of the solution heat exchanger 400 is also made of plastic, so that the sealing between the plate heat exchanger housing 424 and the heat exchange wall plate 420 can be easily realized , the thickness of the plate heat exchanger shell 424 can be reduced. In this way, the weight of the solution heat exchanger 135 is further reduced, and the corrosion resistance of the solution heat exchanger 135 is also enhanced. As an example, the shell 424 of the plate heat exchanger and the heat exchange wall plate 420 can be made of the same type of plastic, and integrally formed by injection molding, so as to provide excellent sealing performance.

In this embodiment, the protruding strip 422 is made of plastic to ensure light weight. As an example, the protruding strip 422 and the heat exchange wall plate 420 are made of the same type of plastic to facilitate manufacture.

The distance between the heat exchange wall plates 420 of two adjacent layers is 0.5 mm to 3 mm, and the distance between the heat exchange wall plates 420 of two adjacent layers is 1 mm in this embodiment. At the same time, since the thickness of the heat exchange wall plate 420 is 0.15mm, the structure of the solution heat exchanger 135 is more compact, and a larger heat exchange area is provided per unit volume, which is beneficial to the miniaturization of the solution heat exchanger 135 .

The regenerator 201, condenser 202, evaporator 204 and absorber 203 are all shell and tube heat exchangers, and they have similar structures. The regenerator 201 and the condenser 202 are taken as examples for description below. Fig. 3A is a three-dimensional schematic diagram of the condenser 202 and one side regenerator 201 in the embodiment of the present invention; Fig. 3B is a cross-sectional schematic diagram of the condenser 202 and one side regenerator 201 in the embodiment of the present invention. In Fig. 3 A and Fig. 3B, there are two shell-and-tube heat exchangers 300, the shell-and-tube heat exchanger 300 on the left side constitutes the condenser 202, and the shell-and-tube heat exchanger 300 on the right side and the solution distributor in the figure 321 constitutes the regenerator 201 .

The shell-and-tube heat exchanger 300 includes heat exchange tubes 310 and a shell-and-tube heat exchanger shell 322 . Several rows of heat exchange tubes 310 are arranged in upper and lower layers (only part of the heat exchange tubes 310 are shown in the figure), and the heat exchange tubes 310 are fixed in the casing 322 of the shell-and-tube heat exchanger. The shell 322 of the shell-and-tube heat exchanger constitutes the tube side of the shell-and-tube heat exchanger 300 , and the heat exchange tubes 310 constitute the shell side of the shell-and-tube heat exchanger 300 .

In the shell-and-tube heat exchanger 300, the heat exchange tube 310 is made of plastic, and the thickness of the tube wall of the heat exchange tube 310 is 0.1mm˜0.5mm. In this embodiment, the tube wall thickness of the heat exchange tube 310 is 0.15 mm. Compared with metal heat exchange tubes, such an extremely thin thickness increases the heat exchange area by more than ten times under the same volume, making up for the insufficient heat transfer performance of plastics, so that the heat transfer performance of heat exchange tube 310 can reach the absorption type Chiller requirements. Since the heat exchange tube 310 is made of plastic, the weight of the shell-and-tube heat exchanger 300 can be greatly reduced compared with the use of metal heat dissipation tubes, thereby achieving light weight. Due to the excellent anti-corrosion performance of the plastic, it is also possible to avoid the generation of non-condensable gas due to the corrosion of the heat exchange tube 310, thereby increasing the working efficiency of the absorption refrigerating machine. At the same time, the heat exchange tube 310 made of plastic is easier to seal than the metal heat exchange tube.

The inventor found through research that the traditional shell-and-tube heat exchanger using metal heat exchange tubes is difficult to seal the metal. In order to ensure the sealing performance of the shell-and-tube heat exchanger, the shell can only be made of thick steel plates. Or made of castings, which further increases the weight of the shell-and-tube heat exchanger and has poor corrosion resistance.

For this reason, in this embodiment, the shell-and-tube heat exchanger shell 322 of the shell-and-tube heat exchanger 300 is also made of plastic, so that the shell-and-tube heat exchanger shell 322 and the heat exchange tube 310 Sealing can be easily achieved, and the thickness of the shell and tube heat exchanger shell 322 can be reduced. In this way, the weight of the shell-and-tube heat exchanger 300 is further reduced, and the corrosion resistance of the shell-and-tube heat exchanger 300 is also enhanced. As an example, the casing 322 of the shell-and-tube heat exchanger and the heat exchange tube 310 can be made of the same type of plastic, and integrally formed by injection molding, so as to provide excellent sealing performance.

Between two adjacent rows of heat exchange tubes 310 , a plurality of support bars 301 are arranged at equal intervals, and the support bars 301 are arranged to intersect with the heat exchange tubes 310 and are perpendicular to the heat exchange tubes 310 . The support bar 301 is used to support two adjacent rows of heat exchange tubes 310 up and down, and bear the structural stress brought by the high vacuum inside the shell and tube heat exchanger shell 322 . In this embodiment, the support bar 301 is made of plastic to ensure light weight. As an example, the support bar 301 and the heat exchange tube 310 are made of the same type of plastic to facilitate manufacture.

The solution distributor 321 is a cuboid with a cavity inside, and the cavity is used for flowing the dilute lithium bromide solution. The solution distributor 321 is disposed on the upper portion of the shell-and-tube heat exchanger 300 on the right side to collectively form the regenerator 201 . A plurality of discharge holes 340 are uniformly arranged on the solution distributor 321 . As an embodiment, the discharge holes 340 are long holes extending in the width direction of the solution distributor 321 and three holes are equally spaced to form a row. In the length direction of the solution distributor 321, multiple drainage orifices 205 are arranged at equal intervals. The drain hole 205 is used to evenly spray the dilute lithium bromide solution in the cavity to the heat exchange tube 310 below.

In this embodiment, the solution dispenser 321 can also be made of plastic to achieve further weight reduction. As an example, the solution distributor 321 can be made of the same type of plastic as the casing 322 of the shell-and-tube heat exchanger, so as to facilitate manufacture, assembly and sealing.

In addition to reducing the weight of the shell-and-tube heat exchanger 300 , the inventor also wishes to realize miniaturization of the shell-and-tube heat exchanger 300 . The miniaturized shell-and-tube heat exchanger 300 can make the overall volume of the absorption refrigerator 100 smaller, so that it can be applied to households or other occasions that do not require high cooling power.

However, the inventor found in the miniaturization process of the shell-and-tube heat exchanger 300 that:

When the shell-and-tube heat exchanger 300 is used as the condenser 202, the heat exchange efficiency is not high, and it is difficult to meet the use requirements after miniaturization. After research, the inventor found that the reason why the heat exchange efficiency of the condenser 202 is not high is that: when the refrigerant vapor enters the condenser 202 and undergoes heat exchange with the heat exchange tube 310 to liquefy, water droplets are formed on the surface of the heat exchange tube 310, and the Under the action of gravity, it collects and drips freely. During the dripping process, the condensed water continuously drips to each row of heat exchange tubes 310 below, forming a falling water film on the surface of the heat exchange tubes 310, especially at the lower arc of the heat exchange tubes 310. The thickness of the water film is often very thick, which increases the heat transfer resistance between the refrigerant steam and the heat exchange tube 310 , which is not conducive to the contact between the refrigerant steam and the heat exchange tube 310 , resulting in low heat exchange efficiency.

When the shell-and-tube heat exchanger 300 is used as a part of the regenerator 201 and the absorber 203, as the cooling power decreases, the required circulation of the working fluid also decreases, and accordingly, the outer surface of the heat exchange tube 310 cannot The unfavorable phenomenon of "dry spot" occurs when it is fully wetted by the lithium bromide solution. In order to avoid dry spots, the inventor tried to increase the flow rate of the circulation pump, and continuously sprayed the working medium liquid far more than the actual required circulation volume from the accumulation pool at the bottom of the regenerator 201 and the absorber 203. on the heat exchange tube 310 at the top. However, this increases the flow rate of the circulating pump, increasing parasitic energy consumption and operating costs. Contrary to the trend of miniaturization and family-oriented development of absorption refrigerators.

When the shell-and-tube heat exchanger 300 is used as the evaporator 204, due to the large specific heat capacity of the refrigerant water, the flow rate of the refrigerant water that needs to be evaporated to complete the rated cooling capacity is relatively small, and a complex refrigerant distributor needs to be installed to accurately distribute the refrigerant water. The refrigerant water is distributed to each heat exchange tube 310, so that the refrigerant water fully infiltrates the heat exchange tube 310 and forms a water film (falling film for short) whose thickness uniformly decreases along the surface of the heat exchange tube 310. With the evaporation of the refrigerant water, the refrigerant water decreases continuously, so that the heat exchange tube 310 cannot be fully wetted, resulting in "dry spots" on the surface of the heat exchange tube 310 . The appearance of dry spots greatly reduces the heat transfer coefficient of the evaporator 204 . Therefore, in order to ensure sufficient humidification, it is necessary to configure a dedicated refrigerant pump, use refrigerant water that is far more than the actual evaporation, and under the pumping of the refrigerant pump, continuously spray the non-evaporated refrigerant water from the bottom of the evaporator 204 to the The top of the evaporator 204. The existence of the refrigerant pump, on the one hand, increases the volume and weight of the refrigerator, making it difficult to miniaturize the evaporator 204, and on the other hand increases the operating cost.

Based on the above reasons, the inventors optimized the outer diameter of the heat exchange tubes 310 and the center-to-center distance between adjacent heat exchange tubes 310 . Set the outer diameter of the heat exchange tubes 310 to 3 mm to 5 mm, set the center distance of adjacent heat exchange tubes 310 in the same row to 4 mm to 6 mm, and set the center distance of the upper and lower adjacent heat exchange tubes 310 to 5 mm ~8mm. In this embodiment, the outer diameter of the heat exchange tubes 310 is 3 mm; the center distance between adjacent heat exchange tubes 310 in the same row is 4 mm; the center distance between the upper and lower adjacent heat exchange tubes 310 is 7 mm. By adopting the heat exchange tubes 310 with small diameter and high density arrangement, a larger heat exchange area per unit volume is obtained, thereby realizing a smaller volume under the premise of satisfying high heat exchange efficiency.

In this way, when the shell-and-tube heat exchanger 300 is used as the condenser 202, the gap between adjacent heat exchange tubes 310 in the same row is only 1mm, such a small gap can play a beneficial role in the surface tension of the refrigerant water, making the exchange The refrigerant water condensed on the surface of the heat pipe 310 collects and drops in the gap. The condensed refrigerant water will not drop to the surface of the lower heat exchange tube 310 to form a water film, so that the thickness of the water film suspended on the lower arc surface of the heat exchange tube 310 can be reduced, thereby improving the overall working efficiency of the condenser 202 . In this way, the condenser 202 can be miniaturized.

When the shell-and-tube heat exchanger 300 is used as a part of the regenerator 201 and the absorber 203, the gap between the adjacent heat exchange tubes 310 of the same row is only 1mm, at this gap, the surface tension and gravity of the lithium bromide solution Combined effect, the lithium bromide solution not only drips, but also diffuses and accumulates in the gap, so as to ensure that the refrigerant water is always submerged in the heat exchange tube 310 . The lithium bromide solution and the heat exchange tube 310 perform combined heat exchange of immersion type and falling film type. At the same time, under the action of the surface tension of the lithium bromide solution, the lithium bromide solution does not need to fill the entire casing 201 , but only needs to be able to submerge the heat exchange tube 310 all the time. Therefore, the deposition height of the lithium bromide solution in the gap can be adjusted according to the flow rate of the lithium bromide solution, so that the lithium bromide solution can evenly immerse the heat exchange tube 310 when the cooling load is small and the flow rate of the lithium bromide solution is small. In this way, the contact between the lithium bromide solution and the heat exchange tube 310 can be ensured without multiple pumping, which effectively prevents dry spots, reduces parasitic energy consumption and operating costs, and makes the regenerator 201 and absorber 203 miniaturized.

When the shell-and-tube heat exchanger 300 is used as the evaporator 204, the outer diameter of the heat exchange tubes 310 is only 3 mm, and the gap between adjacent heat exchange tubes 310 in the same row is only 1 mm. The beneficial effect of surface tension. Under the combined effect of the surface tension of the refrigerant water and gravity, part of the refrigerant water accumulates in the gap, diffuses and wets the row of heat exchange tubes 310 , and the other part drops to the lower heat exchange tubes 310 through the gap. Then, at each gap of the heat exchange tubes 310 , part of the refrigerant water drops to the lower layer through the gaps, and the other part accumulates and diffuses to wet the heat exchange tubes 310 . By analogy, the refrigerant water flows through the heat exchange tubes 310 of each layer in sequence. The refrigerant water flows through the layered heat exchange tubes 310, all of which are completed by gravity. When working in a steady state under the rated cooling condition, the refrigerant water passes through the uppermost row of heat exchange tubes 310 and arrives at the lowermost row of heat exchange tubes 310, and is just completely evaporated without using a refrigerant pump. When the refrigerant water flows through the gap, under the dual effects of surface tension and gravity, there is both flow and accumulation in the gap; the gap can automatically adjust the accumulation height of the refrigerant water in the gap according to the flow rate of the refrigerant water. When the refrigerant water flow rate is large, the height of liquid accumulated in the gap will submerge the heat exchange tube 310, and the flow rate flowing through the gap is also large. When the refrigerant water flow rate is small, the height of the liquid accumulated in the gap is low, but due to the wettability of the surface of the heat exchange tube 310, the refrigerant liquid will infiltrate the heat exchange tube 310, reducing the chance of "dry spots" on the surface of the heat exchange tube 310, Improve heat transfer coefficient. In this way, there is no need to install a dedicated refrigerant pump and refrigerant distributor, which reduces operating costs and is also conducive to the miniaturization of the evaporator 204 .

In order to further reduce the weight and miniaturization of the absorption refrigeration unit 100 and improve the sealing performance, the body shell, water flow interface and solution tank 232 of the absorption refrigeration unit 100 can all be made of plastic. Even the components of the absorption refrigeration unit 100 are all made of plastic.

Fig. 5 is a schematic diagram of an absorption refrigeration matrix 500 formed by direct splicing of six absorption refrigeration units in an embodiment of the present invention. The six absorption refrigeration units have the same structure as the absorption refrigeration unit 100. In order to better express the splicing form of the absorption refrigeration units, in FIG. 5, the six absorption refrigeration units are respectively numbered 501, 502, 503, 504, 505, 506.

Six absorption refrigeration units 501, 502, 503, 504, 505, 506 are superimposed and combined in a 3×2 manner to form an absorption refrigeration matrix 500. The six refrigeration units 501, 502, 503, 504, 505, 506 The water flow interfaces on the respective adjacent combination surfaces are connected together, for example: the hot water inlet of each absorption refrigeration unit is connected with the hot water inlet of the adjacent refrigeration unit; The hot water is introduced through the hot water inlet 511 of the absorption refrigeration unit 501, and then the hot water is input to the regenerator of the respective absorption refrigeration unit through the hot water inlet pipe in each absorption refrigeration unit, and the hot water passes through the absorption refrigeration unit. After exchanging heat, each regenerator of the refrigeration matrix flows out through the hot water outlet pipe of each absorption refrigeration unit, and finally the hot water of the absorption refrigeration matrix 500 returns to the hot water source from the hot water outlet 512 of the absorption refrigeration unit 503 . Similarly, the cold water from the cooling load enters the evaporator of the absorption refrigeration matrix 500 through the cold water inlet 513 of the absorption refrigeration unit 501. Outlet 514 returns to the cooling load. The cooling water from the cooling tower enters the condenser and absorber of the absorption refrigeration matrix 500 through the cooling water inlet 515 of the absorption refrigeration unit 501. After absorbing the heat released by the condenser/absorber, the cooling water flows from the absorption refrigeration unit The cooling water outlet 516 of 503 returns to the cooling tower. The combination surfaces of adjacent absorption refrigeration units are in close contact.

In this way, six absorption refrigeration units are combined to form a whole that works simultaneously, and the cooling power of the combined refrigeration matrix is 6×3RT (about 66kW), which is 6 times the power of a single absorption refrigeration unit. Combination to achieve multiplied expansion of refrigeration power.

In addition, in FIG. 5 , if any absorption refrigeration unit in the absorption refrigeration matrix 500 shuts down due to failure, the work of the entire matrix will not be affected. Other units in the absorption refrigeration matrix 500 can still perform cooling operation as a whole, but the cooling power is reduced.

In the absorption refrigeration unit provided by the embodiment of the present invention, the heat exchange tube is made of plastic, and the thickness of the tube wall of the heat exchange tube is 0.1mm-0.5mm. The wall thickness of such heat exchange tubes is much lower than that of metal heat exchange tubes, and the heat exchange area is increased by more than ten times under the same volume, thus making up for the problem of insufficient heat transfer performance of plastics, making the heat transfer of heat exchange tubes more efficient. The thermal performance can meet the requirements of the absorption refrigerating machine, and the absorption refrigerating unit can realize light weight and miniaturization. At the same time, the heat exchange tube made of plastic is easy to seal, and can be integrally formed with other plastic parts by precision injection molding process, which improves the production efficiency. The plastic has strong corrosion resistance and can avoid non-condensable gas, which increases the working efficiency of the absorption refrigeration unit and reduces the frequency of maintenance. Such an absorption refrigeration unit is suitable for households and commercial occasions requiring less power due to its light weight, miniaturization, and maintenance frequency characteristics.

The absorption refrigeration unit can also form a large absorption refrigeration matrix through the water flow interface group, which has strong scalability. Furthermore, only standardized absorption refrigeration units need to be produced, and multiple absorption refrigeration units can be combined according to needs during use, which greatly improves production efficiency and reduces manufacturing costs and production cycles.

The above descriptions are only some embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (35)

1. absorption refrigeration unit, it is characterised in that:

Described absorption refrigeration unit is an Absorption Refrigerator；

Regenerator, absorber, condenser and the vaporizer of described absorption refrigeration unit is shell-and-tube heat exchanger, including by shell The shell side that formula heat exchanger shell is constituted, and the tube side being made up of the heat exchanger tube in described shell-and-tube heat exchanger housing；Institute State heat exchanger tube to be made of plastics；

The solution heat exchanger of described absorption refrigeration unit is plate type heat exchanger, and described plate type heat exchanger possesses plate type heat exchanger Housing and heat exchange wallboard；Described heat exchange wallboard is fixed in described plate type heat exchanger housing, and described heat exchange wallboard is by plastics system Become.

Absorption refrigeration unit the most according to claim 1, it is characterised in that:

The pipe thickness of described heat exchanger tube is 0.1～0.5mm.

Absorption refrigeration unit the most according to claim 2, it is characterised in that:

The pipe thickness of described heat exchanger tube is 0.15mm.

Absorption refrigeration unit the most according to claim 1, it is characterised in that:

Heat exchanger tube described in some rows is levels arrangement；It is arranged at intervals with multiple support bar between heat exchanger tube described in adjacent two rows； Described support bar is used for supporting heat exchanger tube described in adjacent two rows.

Absorption refrigeration unit the most according to claim 4, it is characterised in that:

Described support bar is made of plastics.

Absorption refrigeration unit the most according to claim 5, it is characterised in that:

Described support bar and described heat exchanger tube are made up of otherwise identical plastic.

Absorption refrigeration unit the most according to claim 1, it is characterised in that:

Heat exchanger tube described in some rows is levels arrangement；The external diameter of described heat exchanger tube is 3mm～5mm；

The centre-to-centre spacing of the adjacent described heat exchanger tube being positioned at same row is 4mm～6mm；

The centre-to-centre spacing of neighbouring described heat exchanger tube is 5mm～8mm.

Absorption refrigeration unit the most according to claim 7, it is characterised in that:

The external diameter of described heat exchanger tube is 3mm；

The centre-to-centre spacing of the adjacent described heat exchanger tube being positioned at same row is 4mm；

The centre-to-centre spacing of neighbouring described heat exchanger tube is 7mm.

Absorption refrigeration unit the most according to claim 1, it is characterised in that:

Described shell-and-tube heat exchanger housing is made of plastics.

Absorption refrigeration unit the most according to claim 9, it is characterised in that:

Described shell-and-tube heat exchanger housing and described heat exchanger tube are made up of otherwise identical plastic.

11. absorption refrigeration unit according to claim 1, it is characterised in that:

The thickness of described heat exchange wallboard is 0.1mm～0.5mm.

12. absorption refrigeration unit according to claim 11, it is characterised in that:

The thickness of described heat exchange wallboard is 0.15mm.

13. absorption refrigeration unit according to claim 1, it is characterised in that:

Weavy grain shape raised line is distributed on described heat exchange wallboard, is used for supporting described heat exchange wallboard, and makes to flow through the stream of described raised line Body produces turbulent flow to improve heat transfer coefficient.

14. absorption refrigeration unit according to claim 13, it is characterised in that:

Described raised line is made of plastics.

15. absorption refrigeration unit according to claim 14, it is characterised in that:

Described raised line and described heat exchange wallboard are made up of otherwise identical plastic.

16. absorption refrigeration unit according to claim 1, it is characterised in that:

Described heat exchange wallboard is multilamellar arrangement；

The wooden partition spacing of the described heat exchange wallboard of adjacent two layers is 0.5mm～3mm.

17. absorption refrigeration unit according to claim 16, it is characterised in that:

The wooden partition spacing of the described heat exchange wallboard of adjacent two layers is 1mm.

18. absorption refrigeration unit according to claim 1, it is characterised in that:

Described plate type heat exchanger housing is made of plastics.

19. absorption refrigeration unit according to claim 18, it is characterised in that:

Described plate type heat exchanger housing and described heat exchange wallboard are made up of otherwise identical plastic.

20. absorption refrigeration unit according to claim 1, it is characterised in that:

The body shell of described absorption refrigeration unit is made of plastics.

21. absorption refrigeration unit according to claim 1, it is characterised in that:

Described absorption refrigeration unit has some current interfaces, in order to import and to derive cold water, hot water and cooling water；Described water Stream interface is made of plastics.

22. absorption refrigeration unit according to claim 1, it is characterised in that:

The components and parts of described absorption refrigeration unit are all made of plastics.

23. according to the absorption refrigeration unit described in any one in claim 1～22, it is characterised in that:

Described absorption refrigeration unit is provided with at least two group current interface group, often organizes described current interface group and at least includes as heat The current interface of the entrance and exit of water, as cold water entrance and exit current interface, as the entrance of cooling water with go out The current interface of mouth；

Adjacent described absorption refrigeration unit can be connected with each other by described current interface so that any number of described suction Receipts formula refrigeration unit can constitute absorption refrigeration matrix by described current interface grafting each other.

24. absorption refrigeration unit according to claim 23, it is characterised in that:

Described absorption refrigeration unit possesses at least two combinatorial surface；The described current interface group of each group is distributed in described combinatorial surface On.

25. absorption refrigeration unit according to claim 24, it is characterised in that:

The body shell of described absorption refrigeration unit is cuboid, and described combinatorial surface is 6 surfaces of described body shell；

Each described combinatorial surface is provided with current interface group described in a group；

Adjacent described absorption refrigeration unit can be connected with each other by described current interface so that any number of described suction Receipts formula refrigeration unit can consist of the described absorption refrigeration matrix of matrix form described current interface grafting each other.

26. absorption refrigeration unit according to claim 25, it is characterised in that:

The combinatorial surface of described absorption refrigeration unit is for the tightst with the combinatorial surface of adjacent described absorption refrigeration unit Laminating, to constitute the described absorption refrigeration matrix of matrix form.

27. absorption refrigeration unit according to claim 25, it is characterised in that:

Described current interface on the described combinatorial surface that least one set is relative is mutually mirror.

28. absorption refrigeration unit according to claim 23, it is characterised in that:

Described absorption refrigeration unit body shell in be provided with water pipe system, described water pipe system is by difference The described current interface of the phase same-action in described current interface group is interconnected；Described water pipe system also with described shell The tube side of formula heat exchanger connects so that described absorption refrigeration unit by any one described current interface group all can simultaneously or Lead in/out hot water, cold water and cooling water respectively.

29. absorption refrigeration unit according to claim 28, it is characterised in that:

Described water pipe system forms integral structure with described body shell.

30. absorption refrigeration unit according to claim 28, it is characterised in that:

Described water pipe system include hot water inlet pipe road, hot water effluent's pipeline, cold water inlet road, cold water outlet conduit, Cooling water inlet pipe road, cooling water outlet pipe road；

Described hot water inlet pipe road connects the entrance of the tube side of hot water inlet and described regenerator；

Described hot water effluent's pipeline connects the outlet of the tube side of hot water outlet and described regenerator；

Described cold water inlet road connects the entrance of the tube side of cold water inlet and described vaporizer；

Described cold water outlet conduit connects the outlet of the tube side of cooling water outlet and described vaporizer；

The entrance of the tube side of connection cooling water inlet, described cooling water inlet pipe road and described absorber and described condenser；

Described cooling water outlet pipe road connects the outlet of the tube side of coolant outlet and described absorber and described condenser.

31. according to the absorption refrigeration unit described in any one in claim 1～22, it is characterised in that:

Described regenerator and described condenser are positioned at the top of the body shell of described absorption refrigeration unit, wherein,

Described regenerator is for the chilled water heating evaporation absorbed in weak solution, it is thus achieved that coolant steam；Evaporation process is inhaled The heat received is provided by the hot water of the tube side of described regenerator；

Described condenser is for condensing into chilled water by the coolant steam obtained in described regenerator cooling, and chilled water is through throttling After flow to the shell side of described vaporizer.

32. according to the absorption refrigeration unit described in any one in claim 1～22, it is characterised in that:

Described vaporizer and described absorber are positioned at the bottom of the body shell of described absorption refrigeration unit, wherein,

Described vaporizer is for by the evaporation endothermic of shell side chilled water, making the cold water of tube side lower the temperature；

The refrigerant vapor that described absorber is used for vaporizer shell side produces absorbs in concentrated solution, the heat released in absorption process Taken away by the cooling water of tube side.

33. according to the absorption refrigeration unit described in any one in claim 1～22, it is characterised in that:

Described absorption refrigeration unit also includes liquor box；Described liquor box for reclaim in described absorber produce dilute molten Liquid, and for described regenerator provide required for weak solution.

34. absorption refrigeration unit according to claim 33, it is characterised in that:

Described liquor box is made of plastics.

35. absorption refrigeration matrixes, it is characterised in that:

Including several absorption refrigeration unit as described in any one in claims 1 to 34.