Lithium bromide water absorption type water chilling unit capable of achieving refrigerating temperature below zero

Abstract

The utility model relates to the field of water chilling units, in particular to a lithium bromide water absorption type water chilling unit with the refrigerating temperature capable of reaching minus zero. Comprising a cooling-water machine body, a condenser, a generator, a low-temperature evaporator, a high-temperature evaporator, a low-temperature absorber and a high-temperature absorber, the condenser and the generator which are symmetrically distributed front and back are installed at the upper end of the cooling-water machine body through a pipeline, and the low-temperature evaporator is installed at the edge of the right end of the cooling-water machine body through a pipeline; the refrigerant used by the low-temperature evaporator is not pure water, but a small amount of lithium bromide dilute solution from the low-temperature absorber is mixed in the pure water, so that the low-temperature evaporator does not freeze when the temperature in the low-temperature evaporator is reduced to below 0 DEG C due to heat absorption during evaporation in the low-temperature evaporator; chilled water exchanging heat with the low-temperature evaporator adopts a method of mixing a certain proportion of ethylene glycol into pure water, so that the chilled water below 0 DEG C cannot be frozen.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of water chiller, specifically relates to a lithium bromide water absorption type water chiller of refrigeration temperature can reach zero. BACKGROUND

[0002] The lithium bromide water absorption type water chiller is a heat energy driven absorption type refrigerator, it is with water as refrigerant, lithium bromide aqueous solution is the absorbent, can utilize the renewable energy such as industrial waste heat, waste heat or solar energy and drive, is a kind of energy-saving and environment-friendly refrigeration equipment.

[0003] The existing lithium bromide water absorption type water chiller is with water as refrigerant, water freezes below 0 degree, so the refrigeration temperature of lithium bromide water absorption type water chiller is usually above 0 degree, and the prepared frozen water is generally used as the cold source of central air conditioning system, and when the refrigeration temperature is below 0 degree, whether using vapor compression type refrigeration system or using absorption system, the refrigerant is usually ammonia, but ammonia is toxic and flammable and explosive, improper use, prone to safety accidents.

[0004] Therefore, in view of the above-mentioned existing water chiller component refrigeration temperature can only be above 0 degree Limit, it is difficult to meet the cold demand of fruit and vegetable cold storage Problem, develop a lithium bromide water absorption type water chiller of refrigeration temperature can reach zero, by adding the antifreeze type refrigerant, the antifreeze cooling water and the additional high-temperature gas recovery structure of good deployment to the water chiller, make the existing lithium bromide water absorption type water chiller can break through the limitation that lithium bromide water absorption system refrigeration temperature can only be above 0 degree, realize refrigeration temperature at least reach-7 degree, to meet the cold demand of fruit and vegetable cold storage, also safe than ammonia system. UTILITY MODEL CONTENTS

[0005] In order to overcome the existing water chiller component refrigeration temperature can only be above 0 degree Limit, it is difficult to meet the cold demand of fruit and vegetable cold storage Problem.

[0006] The technical scheme of the utility model is: a lithium bromide water absorption type water chiller of refrigeration temperature can reach zero, including the water chiller main body, also including condenser, generator, low-temperature evaporator, high-temperature evaporator, low-temperature absorber and high-temperature absorber, the upper end of water chiller main body is installed with the condenser and generator that are front and back symmetry distribution through pipeline, the right end edge of water chiller main body is installed with low-temperature evaporator through pipeline, the left end edge of water chiller main body is installed with high-temperature evaporator through pipeline, the right end center of water chiller main body is installed with low-temperature absorber through pipeline, the left end center of water chiller main body is installed with high-temperature absorber, and pipeline intercommunication system is arranged in water chiller main body.

[0007] Preferably, since the refrigerant used in the low-temperature evaporator is not pure water but pure water mixed with a small amount of dilute lithium bromide solution from the low-temperature absorber, the liquid water containing a small amount of lithium bromide can absorb heat when evaporating in the low-temperature evaporator, so that the temperature in the low-temperature evaporator will not freeze when it drops below 0 degrees. The chilled water that exchanges heat with the low-temperature evaporator is pure water mixed with a certain proportion of ethylene glycol, so that the chilled water below 0 degrees will not freeze.

[0008] Preferably, a hot water inlet is installed at the right end of the generator and a hot water outlet is installed at the left end of the generator. During use, the dilute solution from the low-temperature absorber can be heated by the dilute solution pump through the hot water inlet and hot water outlet and then sprayed onto the upper part of the generator. The sprayed dilute solution is heated by the hot water coil and releases water vapor.

[0009] Preferably, a cooling water outlet is installed at the left end of the condenser, and a cooling water inlet is installed at the lower end of the high-temperature absorber. During use, water vapor can flow into the condenser and enter the refrigerant cycle through the cooling water outlet and cooling water inlet. As the dilute solution releases water vapor in the generator, the dilute solution becomes a concentrated solution and flows out from the bottom of the generator. After being cooled by the heat exchanger, it flows into the high-temperature absorber. The concentrated solution in the high-temperature absorber absorbs the water vapor from the high-temperature evaporator, turning the concentrated solution into an intermediate solution. The absorbed heat is carried away by the cooling water coil flowing through the inside of the high-temperature absorber.

[0010] Preferably, a chilled water outlet is installed at the upper end of the low-temperature evaporator, and a chilled water inlet is installed at the lower end. During use, water can be added to the low-temperature evaporator through pipe L1, which connects to the refrigerant receiver and the refrigerant concentration and level control unit. Since it is necessary to control the liquid level of the low-temperature evaporator, if the amount of water added is more than the required amount, the excess water flows back to the refrigerant pump inlet of the high-temperature evaporator through pipe L2.

[0011] Preferably, the front end of the chiller body is equipped with a control panel and a purification device symmetrically distributed on the left and right sides. The center of the front end of the chiller body is equipped with a liquid level control unit. During use, the control panel allows the operator to easily adjust the working status of the chiller body in real time, and the purification device filters the circulating cooling water to prevent the precipitation of antifreeze components inside, which would affect the normal circulation of the cooling water.

[0012] Preferably, a bottom bracket is installed at the lower end of the chiller body, and a support platform is fixed to the right end of the bottom bracket. During use, the support platform can provide limiting support and side protection for the air pump and refrigerant pump.

[0013] Preferably, the support platform is equipped with a symmetrically distributed air pump and refrigerant pump. An absorber sight glass is installed at the left edge of the chiller body. During use, the refrigerant water passing through the high-temperature evaporator comes from the condenser. The refrigerant water accumulated at the bottom of the condenser flows into the high-temperature evaporator through the U-tube of pipe L11 after pressure reduction. The refrigerant water accumulated at the bottom of the high-temperature evaporator is drawn out by the refrigerant pump, pressurized, and divided into two paths. One path flows along pipe L3 to the coil of the low-temperature absorber and then flows back to the high-temperature evaporator. On the one hand, it carries away the heat generated by the low-temperature absorber solution absorbing water vapor, and on the other hand, it prevents the temperature of the high-temperature evaporator from becoming too low to avoid freezing. The other path enters the refrigerant receiver through pipe L4.

[0014] Preferably, a heat exchanger is installed at the lower end of the chiller body via a pipe, and the upper part of the condenser is connected to the low-temperature absorber via a connecting pipe. During use, the higher temperature and pressure water vapor from the upper part of the condenser is introduced into the low-temperature absorber through the connecting pipe, so that the low-temperature absorber absorbs not only water vapor from the low-temperature evaporator, but also water vapor from the condenser, thereby enhancing the absorption of water vapor by the low-temperature absorber and improving the cooling performance of the system.

[0015] Preferably, the heat exchanger is divided into two groups: a high-temperature group and a low-temperature group. A dilute solution pump is installed on the low-temperature absorber via pipes, and two sets of refrigerant pumps are also installed. An intermediate solution pump is installed on the high-temperature absorber via pipes. During operation, the intermediate solution flows from the bottom of the high-temperature absorber, is cooled by the heat exchanger via the intermediate solution pump, and then flows to the top of the low-temperature absorber for spraying. The sprayed intermediate solution in the low-temperature absorber absorbs water vapor from the low-temperature evaporator and water vapor from the condenser via pipes L13 and L20, turning it into a dilute solution. The heat released during the absorption process is carried away by the chilled water from the high-temperature evaporator. The chilled water in the low-temperature absorber coils absorbs the absorbed heat and then flows back to the high-temperature evaporator, ensuring that the temperature of the high-temperature evaporator is not lower than 4°C. If the temperature of the high-temperature evaporator 15 is lower than 4°C, and if the temperature continues to decrease, there is a risk of icing.

[0016] The beneficial effects of this utility model are:

[0017] 1. Because the refrigerant used in the low-temperature evaporator is not pure water but pure water mixed with a small amount of dilute lithium bromide solution from the low-temperature absorber, the liquid water containing a small amount of lithium bromide can absorb heat when evaporating in the low-temperature evaporator, so that the temperature in the low-temperature evaporator will not freeze when it drops below 0 degrees. The chilled water that exchanges heat with the low-temperature evaporator uses pure water mixed with a certain proportion of ethylene glycol, so that the chilled water below 0 degrees will not freeze. Compared with the existing lithium bromide water absorption chiller, it can break through the limitation that the cooling temperature of the lithium bromide water absorption system can only be above 0 degrees, and achieve a cooling temperature of at least -7 degrees to meet the cooling needs of fruit and vegetable cold storage, and is safer than the ammonia system.

[0018] 2. By introducing high-temperature and high-pressure water vapor from the upper part of the condenser into the low-temperature absorber through a connecting pipe, the low-temperature absorber absorbs water vapor not only from the low-temperature evaporator but also from the condenser. Compared with existing lithium bromide water absorption chillers, this enhances the absorption of water vapor by the low-temperature absorber and improves the cooling performance of the system. Attached Figure Description

[0019] Figure 1 The diagram shown is a three-dimensional structural schematic of the lithium bromide water absorption chiller unit of this utility model, which can reach a cooling temperature below zero.

[0020] Figure 2 The diagram shown is a three-dimensional structural breakdown of the lithium bromide water absorption chiller unit of this utility model, which can reach a cooling temperature below zero.

[0021] Figure 3 The diagram shows a three-dimensional structural schematic of the generator, condenser, control panel, liquid level control unit, purification device, low-temperature evaporator and low-temperature absorber of the lithium bromide water absorption chiller unit of this utility model, which can reach a cooling temperature of below zero.

[0022] Figure 4 The diagram shows a three-dimensional disassembled view of the high-temperature evaporator, high-temperature absorber, and absorber sight glass of the lithium bromide water absorption chiller unit of this utility model, which can reach a cooling temperature below zero.

[0023] Figure 5 The diagram shows a three-dimensional disassembled view of the heat exchanger, air pump, and refrigerant pump of the lithium bromide water absorption chiller unit of this utility model, which can reach a cooling temperature below zero.

[0024] Figure 6 The diagram shown illustrates the operating principle of the lithium bromide water absorption chiller unit of this invention, which can reach a cooling temperature below zero.

[0025] Explanation of reference numerals in the attached drawings: 1-Bottom support, 2-Chiller body, 3-Generator, 4-Condenser, 5-Support platform, 6-Control panel, 7-Liquid level control unit, 8-Purification device, 9-Chiller water inlet, 10-Low-temperature evaporator, 11-Low-temperature absorber, 12-Chiller water outlet, 13-Hot water inlet, 14-Hot water outlet, 15-High-temperature evaporator, 16-Cooling water outlet, 17-High-temperature absorber, 18-Absorber sight glass, 19-Cooling water outlet, 20-Heat exchanger, 21-Air pump, 22-Refrigerant pump. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Please see Figures 1-6This utility model provides an embodiment: a lithium bromide water absorption chiller unit with a cooling temperature reaching below zero, including a chiller body 2, a condenser 4, a generator 3, a low-temperature evaporator 10, a high-temperature evaporator 15, a low-temperature absorber 11, and a high-temperature absorber 17. The condenser 4 and generator 3, symmetrically distributed front to back, are installed at the upper end of the chiller body 2 via pipes. The low-temperature evaporator 10 is installed at the right edge of the chiller body 2 via pipes, and the high-temperature evaporator 15 is installed at the left edge of the chiller body 2 via pipes. The center of the right end of the chiller body 2 is equipped with a... The chiller body 2 is equipped with a low-temperature absorber 11 and a high-temperature absorber 17 is installed at the center of the left end. The chiller body 2 is equipped with a pipe connection system. Since the refrigerant used in the low-temperature evaporator 10 is not pure water but pure water mixed with a small amount of dilute lithium bromide solution from the low-temperature absorber 11, the liquid water containing a small amount of lithium bromide can absorb heat when evaporating in the low-temperature evaporator 10, so that the temperature in the low-temperature evaporator 10 will not freeze when it drops below 0 degrees. The chilled water that exchanges heat with the low-temperature evaporator 10 is pure water mixed with a certain proportion of ethylene glycol, so that the chilled water below 0 degrees will not freeze.

[0028] Please see Figures 3-4In this embodiment, a hot water inlet 13 is installed at the right end of the generator 3, and a hot water outlet 14 is installed at the left end of the generator 3. During use, the dilute solution from the low-temperature absorber 11 is heated by the dilute solution pump through the heat exchanger 20 and sprayed onto the upper part of the generator 3. The sprayed dilute solution is heated by the hot water coil and releases water vapor. A cooling water outlet 19 is installed at the left end of the condenser 4, and a cooling water inlet 16 is installed at the lower end of the high-temperature absorber 17. During use, water vapor flows into the condenser 4 and enters the refrigerant cycle through the cooling water outlet 19 and cooling water inlet 16. Because the dilute solution releases water vapor in the generator 3, the dilute solution becomes a concentrated solution and flows out from the bottom of the generator 3. After being cooled by the heat exchanger 20, it flows into the high-temperature absorber 17. The concentrated solution in the high-temperature absorber 17 absorbs the water vapor from the high-temperature evaporator 15, turning the concentrated solution into an intermediate solution. Heat is carried away by the cooling water coil flowing through the high-temperature absorber 17. The upper end of the low-temperature evaporator 10 is equipped with a chilled water outlet 12, and the lower end of the low-temperature evaporator 10 is equipped with a chilled water inlet 9. During use, water can be added to the low-temperature evaporator 10 through the pipe L1 connected to the refrigerant receiver, refrigerant concentration and liquid level control unit 7. Since it is necessary to control the liquid level of the low-temperature evaporator 10, if the amount of water added is more than the required amount, the excess water flows back to the refrigerant pump 22 inlet of the high-temperature evaporator 15 through the pipe L2. The front end of the chiller body 2 is equipped with a control panel 6 and a purification device 8 symmetrically distributed on the left and right sides. The liquid level control unit 7 is installed at the center of the front end of the chiller body 2. During use, the control panel 6 allows the operator to easily adjust the working status of the chiller body 2 in real time, and the purification device 8 filters the circulating cooling water to prevent the precipitation of antifreeze components inside, which would affect the normal circulation of the cooling water.

[0029] Please see Figures 3-5In this embodiment, a bottom bracket 1 is installed at the lower end of the chiller body 2, and a support platform 5 is fixed to the right end of the bottom bracket 1. During use, the support platform 5 can provide limiting support and side protection for the air pump 21 and the refrigerant pump 22. The air pump 21 and the refrigerant pump 22 are symmetrically distributed on the support platform 5. An absorber sight glass 18 is installed at the left edge of the chiller body 2. During use, the refrigerant water from the high-temperature evaporator 15 comes from the condenser 4. The refrigerant water accumulated at the bottom of the condenser 4 flows into the pipeline L11 after pressure reduction through the U-shaped tube. The high-temperature evaporator 15 has refrigerant water accumulated at its bottom, which is then pumped out by the refrigerant pump 22. After being pressurized, the water is divided into two streams. One stream flows along pipe L3 to the coil of the low-temperature absorber 11 and then back to the high-temperature evaporator 15. This process carries away the heat generated by the solution in the low-temperature absorber 11 during the absorption of water vapor and prevents the temperature of the high-temperature evaporator 15 from becoming too low, thus avoiding freezing. The other stream flows along pipe L4 into the refrigerant receiver. A heat exchanger 20 is installed at the lower end of the chiller body 2 via a pipe, and the upper part of the condenser 4 is connected to the low-temperature absorber 11 via a connecting pipe. In operation, the higher temperature and pressure water vapor from the upper part of the condenser 4 is introduced into the low-temperature absorber 11 through a connecting pipe. This allows the low-temperature absorber 11 to absorb water vapor not only from the low-temperature evaporator 10 but also from the condenser 4, enhancing its absorption of water vapor and improving the system's refrigeration performance. The heat exchanger 20 is divided into high-temperature and low-temperature sets. A dilute solution pump is installed on the low-temperature absorber 11 through a pipe, and the refrigerant pump 22 is divided into two sets. An intermediate solution pump is installed on the high-temperature absorber 17 through a pipe. The intermediate solution flows out from the bottom of the high-temperature absorber 17, is cooled by the intermediate solution pump through the heat exchanger 20, and then flows to the top of the low-temperature absorber 11 for spraying. The intermediate solution sprayed in the low-temperature absorber 11 absorbs water vapor from the low-temperature evaporator 10 and water vapor from the condenser 4 via pipes L13 and L20, turning it into a dilute solution. The heat released during the absorption process is carried away by the chilled water from the high-temperature evaporator 15. The chilled water in the coil of the low-temperature absorber 11 absorbs the heat of absorption and then flows back to the high-temperature evaporator 15, ensuring that the temperature of the high-temperature evaporator 15 is not lower than 4°C. If the temperature of the high-temperature evaporator 15 is lower than 4°C, and if the temperature continues to decrease, there is a risk of freezing.

[0030] The workflow of this system can be divided into solution circulation and refrigerant circulation.

[0031] Regarding the solution circulation, the dilute solution from the low-temperature absorber 11 is heated by the dilute solution pump through the heat exchanger 20 and sprayed onto the upper part of the generator 3. The sprayed dilute solution is heated by the hot water coil and releases water vapor. The water vapor flows into the condenser 4 and enters the refrigerant circulation. Since the dilute solution releases water vapor in the generator 3, the dilute solution becomes a concentrated solution and flows out from the bottom of the generator 3. After being cooled by the heat exchanger 20, it flows into the high-temperature absorber 17. The concentrated solution in the high-temperature absorber 17 absorbs the water vapor from the high-temperature evaporator 15, making the concentrated solution an intermediate solution. The absorbed heat is carried away by the cooling water coil flowing through the inside of the high-temperature absorber 17. If the liquid level in the generator 3 is higher than the ideal liquid level, the concentrated solution in the generator 3 will flow into the high-temperature absorber 17 through the pipeline L10.

[0032] The refrigerant water in the high-temperature evaporator 15 comes from the condenser 4. The refrigerant water accumulated at the bottom of the condenser 4 flows into the high-temperature evaporator 15 after being depressurized by the U-tube along the pipeline L11. The refrigerant water accumulated at the bottom of the high-temperature evaporator 15 is drawn out by the refrigerant pump 22, and after being pressurized, it is divided into two paths. One path flows along the pipeline L3 to the coil of the low-temperature absorber 11, and then flows back to the high-temperature evaporator 15. On the one hand, it carries away the heat generated by the solution in the low-temperature absorber 11 absorbing water vapor, and on the other hand, it prevents the temperature of the high-temperature evaporator 15 from becoming too low to avoid freezing. The other path enters the refrigerant receiver along the pipeline L4.

[0033] The intermediate solution flows out from the bottom of the high-temperature absorber 17, is cooled by the intermediate solution pump through the heat exchanger 20, and then flows to the top of the low-temperature absorber 11 for spraying. The intermediate solution sprayed in the low-temperature absorber 11 absorbs water vapor from the low-temperature evaporator 10 and water vapor from the condenser 4 via pipes L13 and L20, turning it into a dilute solution. The heat released during the absorption process is carried away by the chilled water from the high-temperature evaporator 15. The chilled water in the coil of the low-temperature absorber 11 absorbs the heat of absorption and then flows back to the high-temperature evaporator 15, ensuring that the temperature of the high-temperature evaporator 15 is not lower than 4°C. If the temperature of the high-temperature evaporator 15 is lower than 4°C, and if the temperature continues to decrease, there is a risk of freezing.

[0034] The refrigerant in the low-temperature evaporator 10 comes from the refrigerant concentration and liquid level control unit 7. The refrigerant concentration and liquid level control unit 7 is divided into two non-communicating chambers. The refrigerant water in the right chamber of the refrigerant concentration and liquid level control unit 7 comes from the refrigerant reservoir. Pipeline L12 introduces the water in the refrigerant reservoir (14) into the right chamber of the refrigerant concentration and liquid level control unit 7.

[0035] The bottom of the low-temperature evaporator 10 needs to accumulate a certain level of refrigerant water. The refrigerant flowing out from the bottom of the low-temperature evaporator 10 is pressurized by the refrigerant pump 22 and divided into four paths. The first path goes through the pipeline L11 to the bypass valve. When the bypass valve is open, the refrigerant in the low-temperature evaporator 10 can be released into the low-temperature absorber 11. The second path flows through the pipeline L9 and the angle valve AV1 into the refrigerant concentration and liquid level control unit 7. The third path flows through the pipeline L8 and the valve SV3 into the refrigerant concentration and liquid level control unit 7. The fourth path flows through the pipeline L7 to the low-temperature evaporator 10 for refrigerant spraying.

[0036] The low-temperature evaporator 10 is connected to the left cavity of the refrigerant concentration and liquid level control unit 7 via a U-tube. A float ball is installed on the upper part of the left cavity of the refrigerant concentration and liquid level control unit 7.

[0037] The liquid refrigerant water for the low-temperature evaporator 10 can be replenished through pipe L1, which connects the refrigerant receiver and the refrigerant concentration and level control unit 7. Since it is necessary to control the liquid level of the low-temperature evaporator 10, if the amount of replenished water provided is more than the required amount, the excess water flows back to the inlet of the refrigerant pump 22 of the high-temperature evaporator 15 through pipe L2.

[0038] The dilute solution flows out from the bottom of the low-temperature absorber 11, and after being pressurized by the dilute solution pump, it is divided into two paths. One path goes through pipeline L6 and heat exchanger 20 to enter generator 3, completing the solution circulation. The other path goes through pipeline L5 and valve AV2 to enter refrigerant concentration and liquid level control unit 7.

[0039] There is an L21 connecting pipe between the low-temperature evaporator 10 and the high-temperature evaporator 15, which allows liquid in one evaporator to be transferred to the other evaporator when the liquid level in one evaporator is too high.

[0040] The refrigerant cycle is as follows: Refrigerant vapor released from the high-temperature generator 3 enters the condenser 4, is cooled by cooling water, and the water vapor becomes condensate. The liquid condensate flows into the high-temperature evaporator 15 through pipe L11 and a U-tube. The water vapor evaporated in the high-temperature evaporator 15 is absorbed by the concentrated solution in the high-temperature absorber 17. The refrigerant circulation pump below the high-temperature evaporator 15 draws the refrigerant water from the lower part of the high-temperature evaporator 15, pressurizes it, and divides it into two paths. One path goes along L3 to the low-temperature absorber 11 and then returns to the high-temperature evaporator 15. The other path goes to the refrigerant receiver. The refrigerant in the refrigerant receiver flows into the refrigerant concentration and liquid level control unit 7 through pipe L1, and then enters the low-temperature evaporator 10. The refrigerant water mixed with a small amount of lithium bromide evaporates in the low-temperature evaporator 10, which cools the external chilled water to below 0 degrees Celsius. The evaporated water vapor is absorbed by the intermediate solution in the low-temperature absorber 11, completing the refrigerant cycle.

[0041] Through the above steps, since the refrigerant used in the low-temperature evaporator 10 is not pure water but pure water mixed with a small amount of dilute lithium bromide solution from the low-temperature absorber 11, the liquid water containing a small amount of lithium bromide can absorb heat when evaporating in the low-temperature evaporator 10, so that the temperature inside the low-temperature evaporator 10 will not freeze when it drops below 0 degrees. The chilled water that exchanges heat with the low-temperature evaporator 10 uses pure water mixed with a certain proportion of ethylene glycol, so that the chilled water below 0 degrees will not freeze. This solves the problem that the existing chiller components can only cool at temperatures above 0 degrees, making it difficult to meet the cooling needs of fruit and vegetable cold storage.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A lithium bromide water absorption chiller unit with a cooling temperature down to below zero, comprising a chiller body (2), characterized in that: It also includes a condenser (4), a generator (3), a low-temperature evaporator (10), a high-temperature evaporator (15), a low-temperature absorber (11), and a high-temperature absorber (17). The upper end of the chiller body (2) is equipped with a condenser (4) and a generator (3) that are symmetrically distributed front and back. The right edge of the chiller body (2) is equipped with a low-temperature evaporator (10) through a pipe. The left edge of the chiller body (2) is equipped with a high-temperature evaporator (15) through a pipe. The center of the right end of the chiller body (2) is equipped with a low-temperature absorber (11) through a pipe. The center of the left end of the chiller body (2) is equipped with a high-temperature absorber (17). A pipe connection system is provided inside the chiller body (2).

2. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 1, characterized in that: A hot water inlet (13) is installed at the right end of the generator (3), and a hot water outlet (14) is installed at the left end of the generator (3).

3. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 2, characterized in that: A cooling water outlet (19) is installed at the left end of the condenser (4), and a cooling water inlet (16) is installed at the lower end of the high temperature absorber (17).

4. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 3, characterized in that: The upper end of the low-temperature evaporator (10) is equipped with a chilled water outlet (12), and the lower end of the low-temperature evaporator (10) is equipped with a chilled water inlet (9).

5. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 4, characterized in that: The front end of the chiller body (2) is equipped with a control panel (6) and a purification device (8) that are symmetrically distributed on the left and right sides, and a liquid level control unit (7) is installed at the center of the front end of the chiller body (2).

6. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 5, characterized in that: A bottom bracket (1) is installed at the lower end of the chiller body (2), and a support platform (5) is fixed to the right end of the bottom bracket (1).

7. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 6, characterized in that: The support platform (5) is equipped with an air pump (21) and a refrigerant pump (22) symmetrically distributed in front and back. An absorber sight glass (18) is installed at the left edge of the chiller body (2).

8. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 7, characterized in that: The lower end of the chiller body (2) is equipped with a heat exchanger (20) through a pipe, and the upper part of the condenser (4) is connected to the low temperature absorber (11) through a connecting pipe.

9. The lithium bromide water absorption chiller unit with a cooling temperature down to below zero according to claim 8, characterized in that: The heat exchanger (20) is divided into two groups of exchangers: a high-temperature exchanger and a low-temperature exchanger. A dilute solution pump is installed on the low-temperature absorber (11) through a pipe. The refrigerant pump (22) is divided into two groups. An intermediate solution pump is installed on the high-temperature absorber (17) through a pipe.

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