CN216796369U

CN216796369U - Pasture cooling equipment of multi-temperature-section air cooling box type water chilling unit

Info

Publication number: CN216796369U
Application number: CN202220596929.5U
Authority: CN
Inventors: 张敬超
Original assignee: Anhui Meileke Refrigeration And Air Conditioning Equipment Co ltd Shanghai Branch; Anhui Meluck Refrigeration Equipment Co ltd
Current assignee: Anhui Meileke Refrigeration And Air Conditioning Equipment Co ltd Shanghai Branch; Anhui Meluck Refrigeration Equipment Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-24
Anticipated expiration: 2032-03-18

Abstract

The utility model discloses pasture cooling equipment of a multi-temperature-section air-cooling box type water chilling unit, which relates to the technical field of pasture refrigeration equipment and comprises a water chilling unit and a milk circulation system, wherein the water chilling unit comprises a first refrigeration system, a second refrigeration system and a third refrigeration system, and the water chilling unit and the milk circulation system comprise a refrigeration loop, a high-temperature side water loop, a low-temperature side water loop, a standby water loop and a milk circulation loop. The utility model is provided with a second refrigerating system as a standby refrigerating system, the second refrigerating system can be started when the first refrigerating system or the third refrigerating system breaks down and is maintained, and can also be incorporated into a high-temperature system, namely the first refrigerating system, so as to increase the refrigerating output capacity of the high-temperature system, or incorporated into a low-temperature system, namely the third refrigerating system, so as to increase the refrigerating output capacity of the low-temperature system; the utility model has higher cooling efficiency, more energy saving and environmental protection, can adapt to the requirements of various working conditions, and has stable and safe work.

Description

Pasture cooling equipment of multi-temperature-section air cooling box type water chilling unit

Technical Field

The utility model relates to the technical field of pasture refrigeration equipment, in particular to pasture cooling equipment which is used for cooling milk and adopts a multi-system air-cooling box type water chilling unit with multiple temperature sections mutually standby.

Background

With the development of science and technology and the improvement of the living standard of people, people pay more attention to the health preservation and food health problems, the demand of dairy products is increasing day by day, wherein the demand of milk and goat milk is increased sharply, so that higher requirements are provided for the production efficiency of dairy product production enterprises, and new challenges are provided for energy-saving and environment-friendly production of the enterprises. In the production process of milk and goat milk, the freshly extruded milk, goat milk and the like need to be rapidly cooled from 37 ℃ to about 4 ℃ so as to be convenient for transportation, storage or subsequent deep processing.

The traditional cooling process of the milk and the goat milk comprises the steps of firstly pre-cooling the milk and the goat milk by using tap water or underground water to enable the milk and the goat milk to be cooled to about 20 ℃, and then continuously cooling the milk and the goat milk to about 4 ℃ by using a water chilling unit. When the cooling mode is used for precooling by tap water, due to the fact that the temperature of the tap water is unstable, the precooling effect is not ideal enough, and meanwhile, a large amount of water resources are needed in the precooling process, so that a large amount of resources are consumed and the pressure of the environment is caused; if the pre-cooling is carried out by using underground water, the danger of polluting underground water sources exists, and the environmental protection is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pasture cooling device of a multi-temperature-section air cooling box type water chilling unit in order to avoid the defects of the prior art.

The utility model adopts the following technical scheme for solving the technical problems: a pasture cooling device of a multi-temperature-section air cooling box type water chilling unit comprises a water chilling unit and a milk circulating system, wherein the water chilling unit comprises a first refrigerating system, a second refrigerating system and a third refrigerating system, and the structures and the refrigerating loop connections of the first refrigerating system, the second refrigerating system and the third refrigerating system are the same;

the milk circulating system comprises a milk inlet, a milk valve, a high-temperature side milk heat exchanger, a waterway valve, a high-temperature side water tank, a high-temperature water pump, a high-temperature water outlet, a high-temperature water inlet, a low-temperature water outlet, a low-temperature water inlet, a low-temperature water pump, a low-temperature side water tank, a low-temperature side milk heat exchanger, a milk outlet, a water outlet connecting point and a water inlet connecting point;

each of the first refrigeration system, the second refrigeration system and the third refrigeration system comprises a compressor, a finned condenser, a cold-heat exchanger, an evaporator, a stop valve, a filter, a refrigerant liquid sight glass, a liquid pipe electromagnetic valve, a thermal expansion valve and a water flow switch;

the water chilling unit and the milk circulating system comprise a refrigeration loop, a high-temperature side water loop, a low-temperature side water loop, a standby water loop and a milk circulating loop, wherein:

a refrigeration circuit:

the refrigerant outlet of the fin condenser is communicated with the liquid inlet of the cold heat exchanger; the liquid outlet of the cold-heat exchanger is communicated with the refrigerant inlet of the evaporator, and a pipeline between the two is sequentially communicated with the stop valve, the filter, the stop valve, the refrigerant liquid viewing mirror, the liquid pipe electromagnetic valve and the thermal expansion valve; the refrigerant outlet of the evaporator is communicated with the gas inlet of the cold heat exchanger, and the gas outlet of the cold heat exchanger is communicated with the compressor suction pipe of the compressor;

high temperature side water loop:

the high-temperature water inlet is communicated with a water inlet of an evaporator of the first refrigeration system; the evaporator water outlet of the first refrigeration system is communicated with the high-temperature water outlet, and a water branch valve and a water flow switch are arranged on a pipeline between the evaporator water outlet and the high-temperature water outlet; the high-temperature water outlet is communicated with a water inlet of a high-temperature side milk heat exchanger of the high-temperature side milk heat exchanger; the high-temperature side water tank is communicated with a water inlet of the high-temperature side water tank, and a water way valve is arranged on a pipeline between the high-temperature side water tank and the high-temperature side water tank; the high-temperature side water tank water outlet of the high-temperature side water tank is communicated with the high-temperature water inlet, and a water path valve, a high-temperature water pump and a water path valve are sequentially arranged on a pipeline between the high-temperature side water tank and the high-temperature water inlet;

low-temperature side water loop:

the low-temperature water inlet is communicated with an evaporator water inlet of the third refrigeration system; the evaporator water outlet of the third refrigerating system is communicated with the low-temperature water outlet, and a water branch valve and a water flow switch are arranged on a pipeline between the evaporator water outlet and the low-temperature water outlet; the low-temperature water outlet is communicated with a water inlet of a low-temperature side milk heat exchanger of the low-temperature side milk heat exchanger; the water outlet of the low-temperature side milk heat exchanger is communicated with the water inlet of the low-temperature side water tank, and a waterway valve is arranged on a pipeline between the water outlet and the low-temperature side water tank; the low-temperature side water tank water outlet of the low-temperature side water tank is communicated with the low-temperature water inlet, and a water path valve, a low-temperature water pump and a water path valve are sequentially arranged on a pipeline between the low-temperature side water tank and the low-temperature water inlet;

a standby water circuit:

the water inlet water receiving point is positioned between the high-temperature water inlet and the low-temperature water inlet, and a high-temperature water valve and a low-temperature water valve are respectively arranged between the water inlet water receiving point and the high-temperature water inlet and between the water inlet water receiving point and the low-temperature water inlet water receiving point; the water outlet water receiving point is positioned between the high-temperature water outlet and the low-temperature water outlet, and a high-temperature water valve and a low-temperature water valve are respectively arranged between the water outlet and the high-temperature water outlet;

the water inlet water receiving point is communicated with a water inlet of an evaporator of the second refrigeration system; the evaporator water outlet of the second refrigeration system is communicated with the water outlet water receiving point, and a water branch valve and a water flow switch are arranged on a pipeline between the evaporator water outlet and the water outlet water receiving point;

a milk circulation loop:

the milk inlet is communicated with a high-temperature side milk inlet of the high-temperature side milk heat exchanger, and a milk valve is arranged on a pipeline between the milk inlet and the high-temperature side milk heat exchanger; the milk outlet at the high temperature side of the milk heat exchanger at the high temperature side is communicated with the inlet of the milk heat exchanger at the low temperature side, and a pipeline between the milk heat exchanger and the milk heat exchanger is provided with the milk valve; and the low-temperature side milk heat exchanger outlet of the low-temperature side milk heat exchanger is communicated with the milk outlet, and a milk valve is arranged on a pipeline between the low-temperature side milk heat exchanger and the milk outlet.

The system further comprises a measurement and control branch circuit and an electric cabinet, wherein the measurement and control branch circuit is formed by sequentially communicating a high-pressure meter, a high-pressure controller, a high-low pressure controller, a low-pressure meter and a low-pressure controller, and the electric cabinet is communicated with the high-pressure meter, the high-pressure controller, the high-low pressure controller, the low-pressure meter and the low-pressure controller; the front end of the measurement and control branch is connected to a pipeline at the gas outlet of the cold-heat exchanger and a pipeline at the exhaust pipe of the compressor through a pressure maintaining joint.

The compressor air suction pipe is communicated with the evaporator refrigerant outlet through a pipeline, and a bypass electromagnetic valve is arranged on the pipeline.

Furthermore, another pressure maintaining joint and an exhaust valve are sequentially arranged between the pressure maintaining joint at the front end of the measurement and control branch and the air suction pipe of the compressor and between the pipeline intersection point of the bypass electromagnetic valve and the compressor.

Furthermore, a fin condenser condensing fan is arranged at the top of the fin condenser.

Further, the box of cooling water set is separated for upper strata and lower floor by the median septum in, the fin condenser condensing fan that the fin condenser top set up, the outside panel beating boxboard of condenser high pressure controller, high low pressure controller, low pressure controller locate the upper strata, lower floor is located to compressor, cold and heat exchanger, stop valve, filter, liquid sight glass, liquid pipe solenoid valve, thermal expansion valve, evaporimeter, high-pressure gauge, low-pressure gauge, water flow switch, bypass solenoid valve and electric cabinet.

Furthermore, a high-temperature side water tank overflow pipe, a high-temperature side water tank water supplementing pipe, a low-temperature side water tank overflow pipe and a low-temperature side water tank water supplementing pipe are respectively arranged at the top of the high-temperature side water tank and the top of the low-temperature side water tank, and a high-temperature side water tank drain pipe and a low-temperature side water tank drain pipe are respectively arranged at the bottom of the high-temperature side water tank and the low-temperature side water tank;

the high-temperature side water tank water replenishing pipe and the low-temperature side water tank overflow pipe are internally provided with a high-temperature side water tank ball float valve and a low-temperature side water tank ball float valve respectively, and the high-temperature side water tank ball float valve and the low-temperature side water tank ball float valve are respectively positioned in the high-temperature side water tank and the low-temperature side water tank; the high-temperature side water tank drain pipe and the low-temperature side water tank drain pipe are respectively provided with a high-temperature side water tank drain valve and a low-temperature side water tank drain valve.

Further, the evaporator is a plate evaporator made of 304 stainless steel, and the welding form of the evaporator is brazing type; the high-temperature side milk heat exchanger and the low-temperature side milk heat exchanger are plate heat exchangers made of 304 stainless steel or 316L stainless steel; the water inlet and outlet pipelines of the high-temperature side water tank and the low-temperature side water tank are made of 304 stainless steel.

Further, the compressor is a fully-enclosed scroll compressor using an environment-friendly refrigerant R410A.

Further, the cold-heat exchanger is a vertical heat exchanger.

The utility model provides pasture cooling equipment of a multi-temperature-section air-cooled box type water chilling unit, which has the following beneficial effects:

1. the utility model adopts high-low temperature water to pre-cool the milk, has higher cooling efficiency compared with the traditional cooling mode of pre-cooling the milk by tap water and underground water, and is more energy-saving and environment-friendly;

2. the utility model is provided with a second refrigerating system as a standby refrigerating system, the second refrigerating system can be started when the first refrigerating system or the third refrigerating system breaks down and is maintained, and the second refrigerating system can also be merged into a high-temperature system, namely the first refrigerating system, so as to increase the refrigerating output capacity of the high-temperature system, or merged into a low-temperature system, namely the third refrigerating system, so as to increase the refrigerating output capacity of the low-temperature system, the utility model can adapt to the requirements of various working conditions, and the work is stable and safe;

3. the utility model has compact structure, convenient operation, low pipeline connection difficulty, suitability for outdoor installation and good practicability.

Drawings

FIG. 1 is a schematic diagram of the circuit connection of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a top view of the present invention;

FIG. 4 is a right side view of the present invention;

FIG. 5 is a left side view of the present invention;

FIG. 6 is a rear view of the present invention;

FIG. 7 is a plan view at C-C of the present invention;

FIG. 8 is a plan view at D-D of the present invention;

FIG. 9 is a plan view at E-E of the present invention.

In the figure:

A. a water chilling unit; B. a milk circulation system; 1#, a first refrigeration system, 2#, a second refrigeration system and 3# a third refrigeration system; 1. 1.1 parts of a compressor, 1.2 parts of a compressor exhaust pipe and a compressor air suction pipe; 2. 2.1 parts of a fin condenser, 2.1 parts of a fin refrigerant inlet, 2.2 parts of a fin refrigerant outlet and 2.3 parts of a fin condenser condensing fan; 3. a cold-heat exchanger, 3.1, a cold-heat exchanger liquid inlet, 3.2, a cold-heat exchanger liquid outlet, 3.3, a cold-heat exchanger gas inlet, 3.4, a cold-heat exchanger gas outlet; 4. a stop valve; 5. a filter; 6. a liquid sight glass; 7. a liquid pipe electromagnetic valve; 8. a thermostatic expansion valve; 9. 9.1 parts of an evaporator, 9.1 parts of an evaporator refrigerant inlet, 9.2 parts of an evaporator refrigerant outlet, 9.3 parts of an evaporator water inlet, 9.4 parts of an evaporator water outlet; 10. a water bypass valve; 12. a pressure maintaining joint; 13. an exhaust valve; 14. a high-pressure gauge; 15. a high voltage controller; 16. a high-low voltage controller; 17. a low pressure gauge; 18. a low-voltage controller; 19. a water flow switch; 22. a high temperature water valve; 23. a low temperature water valve; 24. a high-temperature water outlet; 25. a high temperature water inlet; 26. a low-temperature water outlet; 27. a low temperature water inlet; 28. 28.1 parts of a high-temperature side milk heat exchanger, 28.1 parts of a high-temperature side milk heat exchanger water inlet, 28.2 parts of a high-temperature side milk heat exchanger water outlet, 28.3 parts of a high-temperature side milk outlet and 28.4 parts of a high-temperature side milk inlet; 29. a waterway valve; 30. 30.1 parts of a high-temperature side water tank, 30.1 parts of a high-temperature side water tank water inlet, 30.2 parts of a high-temperature side water tank water outlet, 30.3 parts of a high-temperature side water tank drain pipe, 30.4 parts of a high-temperature side water tank water replenishing pipe, 30.5 parts of a high-temperature side water tank overflow pipe, 30.6 parts of a high-temperature side water tank ball float valve and 30.7 parts of a high-temperature side water tank drain valve; 31. a high-temperature water pump; 32. 32.1, a water inlet of the low-temperature side milk heat exchanger, 32.2, a water outlet of the low-temperature side milk heat exchanger, 32.3, an outlet of the low-temperature side milk heat exchanger and 32.4, an inlet of the low-temperature side milk heat exchanger; 33. 33.1 parts of a low-temperature side water tank, 33.1 parts of a low-temperature side water tank water inlet, 33.2 parts of a low-temperature side water tank water outlet, 33.3 parts of a low-temperature side water tank drain pipe, 33.4 parts of a low-temperature side water tank water replenishing pipe, 33.5 parts of a low-temperature side water tank overflow pipe, 33.6 parts of a low-temperature side water tank ball float valve, 33.7 parts of a low-temperature side water tank drain valve; 34. a low-temperature water pump; 35. a milk valve; 36. a milk outlet; 37. a milk inlet; 38. a bypass solenoid valve; 40. an electric cabinet; 41. the effluent water is connected with a water point; 42. the water inlet is connected with a water point.

Detailed Description

In order to make the objects, 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 with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the structural relationship is: the milk refrigeration system comprises a water chilling unit A and a milk circulation system B, wherein the water chilling unit A comprises a first refrigeration system 1#, a second refrigeration system 2# and a third refrigeration system 3#, and the structures and refrigeration loop connections of the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# are the same;

the milk circulating system B comprises a milk inlet 37, a milk valve 35, a high-temperature side milk heat exchanger 28, a waterway valve 29, a high-temperature side water tank 30, a high-temperature water pump 31, a high-temperature water outlet 24, a high-temperature water inlet 25, a low-temperature water outlet 26, a low-temperature water inlet 27, a low-temperature water pump 34, a low-temperature side water tank 33, a low-temperature side milk heat exchanger 32, a milk outlet 36, an outlet water receiving point 41 and an inlet water receiving point 42;

the high-temperature side milk heat exchanger 28 and the low-temperature side milk heat exchanger 32 are both in a structure form of two inlets and two outlets;

the two inlets and the two outlets of the high-temperature side milk heat exchanger 28, namely the water outlet 28.2 of the high-temperature side milk heat exchanger and the high-temperature side milk inlet 28.4, are positioned below, the water inlet 28.1 of the high-temperature side milk heat exchanger and the high-temperature side milk outlet 28.3 are positioned above, and the sizes of all the connectors are the same;

two inlets and two outlets of the low-temperature side milk heat exchanger 32, namely the low-temperature side milk heat exchanger water outlet 32.2 and the low-temperature side milk heat exchanger inlet 32.4 are positioned below, the low-temperature side milk heat exchanger water inlet 32.1 and the low-temperature side milk heat exchanger outlet 32.3 are positioned above, and the sizes of all the interfaces are the same.

Each of the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# comprises a compressor 1, a finned condenser 2, a cold-heat exchanger 3, an evaporator 9, a stop valve 4, a filter 5, a refrigerant liquid viewing mirror 6, a liquid pipe electromagnetic valve 7, a thermal expansion valve 8 and a water flow switch 19;

the cold-heat exchanger 3 is in a structure form with two inlets and two outlets, and the two inlets and the two outlets of the cold-heat exchanger 3, namely a cold-heat exchanger liquid inlet 3.1, a cold-heat exchanger liquid outlet 3.2, a cold-heat exchanger gas inlet 3.3 and a cold-heat exchanger gas outlet 3.4 are all positioned at the top of the cold-heat exchanger 3;

the size of the interface between the cold-heat exchanger liquid inlet 3.1 and the cold-heat exchanger liquid outlet 3.2 is smaller than that of the cold-heat exchanger gas inlet 3.3 and the cold-heat exchanger gas outlet 3.4; the liquid inlet 3.1 of the cold-heat exchanger and the gas inlet 3.3 of the cold-heat exchanger are marked with the word "IN", and the liquid outlet 3.2 of the cold-heat exchanger and the gas outlet 3.4 of the cold-heat exchanger are marked with the word "OUT";

the evaporator 9 is in a structure form with two inlets and two outlets, the two inlets and the two outlets of the evaporator 9, namely an evaporator refrigerant inlet 9.1 and an evaporator water inlet 9.3, are positioned below, and an evaporator refrigerant outlet 9.2 and an evaporator water outlet 9.4 are positioned above; the interface size of the evaporator refrigerant inlet 9.1 is smaller than the interface size of the evaporator refrigerant outlet 9.2, and the interface sizes of the evaporator water inlet 9.3 and the evaporator water outlet 9.4 are the same.

The water chilling unit A and the milk circulating system B comprise a refrigeration loop, a high-temperature side water loop, a low-temperature side water loop, a standby water loop and a milk circulating loop, wherein:

a refrigeration circuit:

a compressor exhaust pipe 1.1 of the compressor 1 is communicated with a fin refrigerant inlet 2.1 of the fin condenser 2, and a fin refrigerant outlet 2.2 of the fin condenser 2 is communicated with a cold-heat exchanger liquid inlet 3.1 of the cold-heat exchanger 3; a liquid outlet 3.2 of the cold-heat exchanger 3 is communicated with an evaporator refrigerant inlet 9.1 of the evaporator 9, and a pipeline between the cold-heat exchanger and the evaporator refrigerant inlet is sequentially communicated with a stop valve 4, a filter 5, the stop valve 4, a refrigerant liquid viewing mirror 6, a liquid pipe electromagnetic valve 7 and a thermal expansion valve 8; an evaporator refrigerant outlet 9.2 of the evaporator 9 is communicated with a cold-heat exchanger gas inlet 3.3 of the cold-heat exchanger 3, and a cold-heat exchanger gas outlet 3.4 of the cold-heat exchanger 3 is communicated with a compressor suction pipe 1.2 of the compressor 1;

the arrangement of the cold-heat exchanger 3 increases the supercooling degree of the refrigerant liquid flowing out of the fin refrigerant outlet 2.2 and the superheat degree of the refrigerant gas flowing out of the evaporator refrigerant outlet 9.2, and further improves the cooling efficiency and the safety of the cooling system;

the mixture of the refrigerant gas with high temperature and high pressure and the refrigeration oil flows out from the compressor exhaust pipe 1.1, enters the fin condenser 2 from the fin refrigerant inlet 2.1, and is condensed into refrigerant liquid in the fin condenser 2; then the refrigerant liquid flows out from the fin refrigerant outlet 2.2, enters the cold-heat exchanger 3 from the cold-heat exchanger liquid inlet 3.1, exchanges heat in a heat release channel between the cold-heat exchanger liquid inlet 3.1 and the cold-heat exchanger liquid outlet 3.2 in the cold-heat exchanger 3, and is cooled into a supercooled liquid refrigerant; the supercooled liquid refrigerant then flows out from a liquid outlet 3.2 of the cold-heat exchanger, sequentially passes through a stop valve 4, a filter 5, a stop valve 4, a liquid viewing mirror 6, a liquid pipe electromagnetic valve 7 and a thermostatic expansion valve 8, enters an evaporator 9 from an evaporator refrigerant inlet 9.1, and exchanges heat in a heat absorption channel between the evaporator refrigerant inlet 9.1 and an evaporator refrigerant outlet 9.2 in the evaporator 9 to form a low-temperature heat absorption end in the evaporator 9, and the supercooled liquid refrigerant absorbs heat to become refrigerant gas; the refrigerant gas flows out from the refrigerant outlet 9.2 of the evaporator, enters the cold-heat exchanger 3 from the gas inlet 3.3 of the cold-heat exchanger, exchanges heat in a heat absorption channel between the gas inlet 3.3 of the cold-heat exchanger in the cold-heat exchanger 3 and the gas outlet 3.4 of the cold-heat exchanger, and absorbs heat to become superheated refrigerant gas; finally, the superheated refrigerant gas flows out of the gas outlet 3.4 of the cold-heat exchanger, enters the compressor 1 through the compressor suction pipe 1.2, and is compressed into high-temperature and high-pressure refrigerant gas in the compressor 1.

High-temperature side water loop:

the high-temperature water inlet 25 is communicated with an evaporator water inlet 9.3 of the first refrigeration system 1 #; the water outlet 9.4 of the evaporator of the first refrigeration system 1# is communicated with the high-temperature water outlet 24, and a water branch valve 10 and a water flow switch 19 are arranged on a pipeline between the evaporator and the high-temperature water outlet; the high-temperature water outlet 24 is communicated with a high-temperature side milk heat exchanger water inlet 28.1 of the high-temperature side milk heat exchanger 28; a water outlet 28.2 of the high-temperature side milk heat exchanger 28 is communicated with a water inlet 30.1 of a high-temperature side water tank of the high-temperature side water tank 30, and a waterway valve 29 is arranged on a pipeline between the high-temperature side milk heat exchanger and the high-temperature side water tank; a high-temperature side water tank water outlet 30.2 of the high-temperature side water tank 30 is communicated with the high-temperature water inlet 25, and a waterway valve 29, a high-temperature water pump 31 and a waterway valve 29 are sequentially arranged on a pipeline between the high-temperature side water tank and the high-temperature side water tank;

the high-temperature side water flow path flows out from the high-temperature water inlet 25, flows into the evaporator 9 of the first refrigeration system 1# from the evaporator water inlet 9.3 of the first refrigeration system 1#, exchanges heat in a heat release channel between the evaporator water inlet 9.3 and the evaporator water outlet 9.4 in the evaporator 9, and releases heat and reduces the temperature of the high-temperature side water flow; then, the high-temperature side water flow flows out from the water outlet 9.4 of the evaporator of the first refrigeration system 1#, flows into the high-temperature side milk heat exchanger 28 from the water inlet 28.1 of the high-temperature side milk heat exchanger through the water branch valve 10, the water flow switch 19 and the high-temperature water outlet 24, and exchanges heat in a heat absorption channel between the water inlet 28.1 of the high-temperature side milk heat exchanger in the high-temperature side milk heat exchanger 28 and the water outlet 28.2 of the high-temperature side milk heat exchanger, so that the high-temperature side water flow absorbs heat and the temperature is increased; the high-temperature side water flow flows out from a high-temperature side milk heat exchanger water outlet 28.2 of the high-temperature side milk heat exchanger 28, enters the high-temperature side water tank 30 from a high-temperature side water tank water inlet 30.1 of the high-temperature side water tank 30 through the waterway valve 29, finally flows out from a high-temperature side water tank water outlet 30.2 of the high-temperature side water tank 30, and returns to the high-temperature water inlet 25 through the waterway valve 29, the high-temperature water pump 31 and the waterway valve 29 in sequence.

Low-temperature side water loop:

the low-temperature water inlet 27 is communicated with an evaporator water inlet 9.3 of the third refrigerating system 3 #; the water outlet 9.4 of the evaporator of the third refrigerating system 3# is communicated with the low-temperature water outlet 26, and a water branch valve 10 and a water flow switch 19 are arranged on a pipeline between the evaporator and the low-temperature water outlet; the low-temperature water outlet 26 is communicated with a low-temperature side milk heat exchanger water inlet 32.1 of the low-temperature side milk heat exchanger 32; a water outlet 32.2 of the low-temperature side milk heat exchanger 32 is communicated with a water inlet 33.1 of a low-temperature side water tank 33, and a water path valve 29 is arranged on a pipeline between the low-temperature side milk heat exchanger and the low-temperature side water tank; a low-temperature side water tank water outlet 33.2 of the low-temperature side water tank 33 is communicated with the low-temperature water inlet 27, and a water path valve 29, a low-temperature water pump 34 and the water path valve 29 are sequentially arranged on a pipeline between the low-temperature side water tank and the low-temperature water tank;

the low-temperature side water flow path flows out from the low-temperature water inlet 27, flows into the evaporator 9 of the third refrigerating system 3# from the evaporator water inlet 9.3 of the third refrigerating system 3#, exchanges heat in a heat release channel between the evaporator water inlet 9.3 and the evaporator water outlet 9.4 in the evaporator 9, and releases heat and reduces the temperature of the low-temperature side water flow; then, the low-temperature side water flow flows out from an evaporator water outlet 9.4 of the third refrigeration system 3#, flows into the low-temperature side milk heat exchanger 32 from a low-temperature side milk heat exchanger water inlet 32.1 of the low-temperature side milk heat exchanger 32 through the water branch valve 10, the water flow switch 19 and the low-temperature water outlet 26, and exchanges heat in a heat absorption channel between the low-temperature side milk heat exchanger water inlet 32.1 and the low-temperature side milk heat exchanger water outlet 32.2 in the low-temperature side milk heat exchanger 32, so that the low-temperature side water flow absorbs heat and the temperature rises; the low-temperature side water flow flows out from a low-temperature side milk heat exchanger water outlet 32.2 of the low-temperature side milk heat exchanger 32, enters the low-temperature side water tank 33 from a low-temperature side water tank water inlet 33.1 of the low-temperature side water tank 33 through the water path valve 22, finally flows out from a low-temperature side water tank water outlet 33.2 of the low-temperature side water tank 33, and returns to the low-temperature water inlet 27 through the water path valve 29, the low-temperature water pump 34 and the water path valve 29 in sequence.

A standby water loop:

the water inlet water receiving point 42 is positioned between the high-temperature water inlet 25 and the low-temperature water inlet 27, and a high-temperature water valve 22 and a low-temperature water valve 23 are respectively arranged between the water inlet and the high-temperature water inlet 25 and between the water inlet and the low-temperature water inlet 27; the water outlet receiving point 41 is positioned between the high-temperature water outlet 24 and the low-temperature water outlet 26, and a high-temperature water valve 22 and a low-temperature water valve 23 are respectively arranged between the water outlet receiving point and the high-temperature water outlet 24 and between the water outlet receiving point and the low-temperature water outlet 26; the water inlet water receiving point 42 is communicated with the evaporator water inlet 9.3 of the second refrigerating system 2 #; the water outlet 9.4 of the evaporator of the second refrigerating system 2# is communicated with a water outlet water receiving point 41, and a water branch valve 10 and a water flow switch 19 are arranged on a pipeline between the evaporator and the water outlet water receiving point;

the second refrigeration system 2# is a backup refrigeration system, and the working state of the backup refrigeration system is set to be one of the following five states according to actual needs in cooperation with a backup water loop:

a. deactivated state

In this state, the first refrigeration system 1# and the third refrigeration system 3# are activated, the second refrigeration system 2# is deactivated, and the high-temperature water valves 22 and the low-temperature water valves 23 are closed;

b. alternative first refrigerant System 1# State

In this state, the first refrigeration system 1# is stopped, the second refrigeration system 2# and the third refrigeration system 3# are started, the high-temperature water valves 22 are opened, and the low-temperature water valves 23 are closed;

c. alternate third refrigerant System # 3 State

In this state, the first refrigeration system 1# and the third refrigeration system 2# are started, the third refrigeration system 3# is stopped, the high-temperature water valves 22 are closed, and the low-temperature water valves 23 are opened;

d. working in cooperation with the first refrigeration system 1#

In this state, the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# are all started, each high-temperature water valve 22 is opened, and each low-temperature water valve 23 is closed;

e. working in conjunction with the third refrigeration system 3#

In this state, the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# are all started, the high-temperature water valves 22 are closed, and the low-temperature water valves 23 are opened.

A milk circulation loop:

the milk inlet 37 is communicated with a high-temperature side milk inlet 28.4 of the high-temperature side milk heat exchanger 28, and a milk valve 35 is arranged on a pipeline between the milk inlet and the high-temperature side milk heat exchanger 28; a high-temperature side milk outlet 28.3 of the high-temperature side milk heat exchanger 28 is communicated with a low-temperature side milk heat exchanger inlet 32.4 of the low-temperature side milk heat exchanger 32, and a milk valve 35 is arranged on a pipeline between the high-temperature side milk heat exchanger and the low-temperature side milk heat exchanger; the low-temperature side milk heat exchanger outlet 32.3 of the low-temperature side milk heat exchanger 32 is communicated with the milk outlet 36, and a milk valve 35 is arranged on a pipeline between the low-temperature side milk heat exchanger and the milk outlet 36.

The milk flow path is that the milk flows in from the milk inlet 37, enters the high-temperature side milk heat exchanger 28 from the high-temperature side milk inlet 28.4 through the milk valve 35, exchanges heat in a heat release channel between the high-temperature side milk inlet 28.4 and the high-temperature side milk outlet 28.3 in the high-temperature side milk heat exchanger 28, and releases heat and reduces the temperature of the milk; then, the milk flows out from the high-temperature side milk outlet 28.3, enters the low-temperature side milk heat exchanger 32 from the low-temperature side milk heat exchanger inlet 32.4 through the milk door 35, exchanges heat in a heat release channel between the low-temperature side milk heat exchanger inlet 32.4 and the low-temperature side milk heat exchanger outlet 32.3 in the low-temperature side milk heat exchanger 32, and releases heat and reduces the temperature of the milk; the milk flows out from the outlet 32.3 of the low-temperature side milk heat exchanger and reaches the milk outlet 36 through the milk valve 35 to be sent away.

Preferably, the system also comprises a measurement and control branch formed by sequentially communicating a high-pressure meter 14, a high-pressure controller 15, a high-low pressure controller 16, a low-pressure meter 17 and a low-pressure controller 18, and an electric control box 40 communicated with the high-pressure meter 14, the high-pressure controller 15, the high-low pressure controller 16, the low-pressure meter 17 and the low-pressure controller 18; the front end of the measurement and control branch is connected to a pipeline at the gas outlet 3.4 of the cold-heat exchanger and a pipeline at the exhaust pipe 1.1 of the compressor through a pressure maintaining joint 12.

Preferably, the compressor suction pipe 1.2 is in line communication with the evaporator refrigerant outlet 9.2 and a bypass solenoid valve 38 is provided in the line.

When the environmental temperature is low, such as in winter, the bypass electromagnetic valve 38 should be firstly opened when the compressor 1 starts to operate, so as to raise the low-pressure of the compressor 1 in operation, and avoid the low-pressure alarm of the low-pressure controller 16 in the corresponding refrigeration system, which results in the abnormal operation of the refrigeration system; when the system hold-down pressure is higher than the on-pressure of the low pressure controller 18, the low pressure controller 18 contacts are open, and the bypass solenoid valve 38 may be closed.

Preferably, another pressure maintaining joint 12 and an exhaust valve 13 are further sequentially arranged between the pressure maintaining joint 12 at the front end of the measurement and control branch and a pipeline intersection point of the compressor suction pipe 1.2 and the bypass electromagnetic valve 38.

Preferably, a fin condenser condensing fan 2.3 is arranged at the top of the fin condenser 2.

The high-pressure controller 15 is a controller capable of automatically resetting, the condenser condensing fan 2.3 is stopped after the compressor 1 is started, when the high-pressure of the system is higher than the connection pressure of the high-pressure controller 15, the contact of the high-pressure controller 15 is conducted, and the condenser condensing fan 2.3 is started to cool the compressor 1 and condense the gaseous refrigerant in the fin condenser 2 into the liquid refrigerant.

As shown in FIGS. 2-9: preferably, the box body of the water chilling unit A is divided into an upper layer and a lower layer by a middle partition plate, the fin condenser 2, a fin condenser condensing fan 2.3 arranged at the top of the fin condenser 2, a sheet metal box plate outside the condenser, a high-pressure controller 15, a high-low pressure controller 16 and a low-pressure controller 18 are arranged on the upper layer, and the compressor 1, the cold-heat exchanger 3, the stop valve 4, the filter 5, the liquid sight glass 6, the liquid pipe electromagnetic valve 7, the thermal expansion valve 8, the evaporator 9, the high-pressure meter 14, the low-pressure meter 17, the water flow switch 19, the bypass electromagnetic valve 38 and the electric cabinet 40 are arranged on the lower layer.

Preferably, the top of the high-temperature side water tank 30 and the low-temperature side water tank 33 are respectively provided with a high-temperature side water tank overflow pipe 30.4, a high-temperature side water tank water replenishing pipe 30.3, a low-temperature side water tank overflow pipe 33.4 and a low-temperature side water tank water replenishing pipe 33.3, and the bottom of the high-temperature side water tank 30 and the low-temperature side water tank water draining pipe 33.5;

a high-temperature side water tank ball float valve 30.6 and a low-temperature side water tank ball float valve 33.6 are respectively arranged in the high-temperature side water tank water replenishing pipe 30.3 and the low-temperature side water tank overflow pipe 33.4, and the high-temperature side water tank ball float valve 30.6 and the low-temperature side water tank ball float valve 33.6 are respectively positioned in the high-temperature side water tank 30 and the low-temperature side water tank 33; the high temperature side water tank drain pipe 30.5 and the low temperature side water tank drain pipe 33.5 are respectively provided with a high temperature side water tank drain valve 30.7 and a low temperature side water tank drain valve 33.7.

Preferably, the evaporator 9 is a plate evaporator made of 304 stainless steel, the welding form of which is brazed; the high temperature side milk heat exchanger 28 and the low temperature side milk heat exchanger 32 are plate heat exchangers made of 304 stainless steel or 316L stainless steel; the water inlet and outlet pipes of the high temperature side water tank 30 and the low temperature side water tank 33 are made of 304 stainless steel.

Preferably, the compressor 1 is a fully-enclosed scroll compressor using the eco-friendly refrigerant R410A.

Preferably, the cold heat exchanger 3 is a vertical heat exchanger.

When the refrigeration system is used specifically, the outlet water at 9.4 of the water outlet of the evaporator of the first refrigeration system 1# is high-temperature outlet water, and the temperature can be set to 10 +/-0.5 ℃; the effluent at 9.4 of the water outlet of the evaporator of the third refrigerating system 3# is low-temperature effluent, and the temperature can be set to be 2 +/-0.5 ℃;

the five working states of the outlet water at the evaporator outlet 9.4 of the second refrigeration system 2# are respectively as follows:

a. deactivated state

In the state, the first refrigeration system 1# and the third refrigeration system 3# are started, the second refrigeration system 2# is stopped, the evaporator 9 of the second refrigeration system 2# does not participate in refrigeration, and the outlet water temperature at the evaporator water outlet 9.4 of the evaporator 9 does not need to be set;

b. alternative first refrigerant System 1# State

In the state, the first refrigeration system 1# is stopped, the second refrigeration system 2# and the third refrigeration system 3# are started, the outlet water at the water outlet 9.4 of the evaporator of the second refrigeration system 2# is high-temperature outlet water, and the temperature can be set to 10 +/-0.5 ℃;

c. alternative third refrigerant System # 3 State

In the state, the first refrigeration system 1# and the third refrigeration system 2# are started, the third refrigeration system 3# is stopped, the outlet water at the water outlet 9.4 of the evaporator of the second refrigeration system 2# is low-temperature outlet water, and the temperature can be set to be 2 +/-0.5 ℃;

d. working in cooperation with the first refrigeration system 1#

In the state, the first refrigerating system No. 1, the second refrigerating system No. 2 and the third refrigerating system No. 3 are all started, the outlet water at the water outlet 9.4 of the evaporator of the second refrigerating system No. 2 is high-temperature outlet water, and the temperature can be set to be 10 +/-0.5 ℃;

e. working in conjunction with the third refrigeration system 3#

In this state, the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# are all started, the outlet water at the water outlet 9.4 of the evaporator of the second refrigeration system 2# is low-temperature outlet water, and the temperature can be set to 2 +/-0.5 ℃.

The utility model takes the first refrigeration system 1# as a high-temperature system, the third refrigeration system 3# as a low-temperature system and the second refrigeration system 2# as a standby system, and can adjust the corresponding arrangement relationship between the high-temperature system, the low-temperature system and the standby system and the first refrigeration system 1#, the second refrigeration system 2# and the third refrigeration system 3# according to the actual requirements during actual use.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a pasture cooling of box cooling water set of multi-temperature section forced air cooling is equipped which characterized in that: the refrigeration system comprises a water chilling unit (A) and a milk circulating system (B), wherein the water chilling unit (A) comprises a first refrigeration system (1#), a second refrigeration system (2#) and a third refrigeration system (3#), and the structures and refrigeration loop connections of the first refrigeration system (1#), the second refrigeration system (2#) and the third refrigeration system (3#) are the same;

the milk circulating system (B) comprises a milk inlet (37), a milk valve (35), a high-temperature side milk heat exchanger (28), a water way valve (29), a high-temperature side water tank (30), a high-temperature water pump (31), a high-temperature water outlet (24), a high-temperature water inlet (25), a low-temperature water outlet (26), a low-temperature water inlet (27), a low-temperature water pump (34), a low-temperature side water tank (33), a low-temperature side milk heat exchanger (32), a milk outlet (36), an outlet water receiving point (41) and an inlet water receiving point (42);

each of the first refrigeration system (1#), the second refrigeration system (2#) and the third refrigeration system (3#) comprises a compressor (1), a finned condenser (2), a cold-heat exchanger (3), an evaporator (9), a stop valve (4), a filter (5), a liquid sight glass (6), a liquid pipe electromagnetic valve (7), a thermostatic expansion valve (8) and a water flow switch (19);

the water chilling unit (A) and the milk circulating system (B) comprise a refrigerating circuit, a high-temperature side water circuit, a low-temperature side water circuit, a standby water circuit and a milk circulating circuit, wherein:

a refrigeration circuit:

a compressor exhaust pipe (1.1) of the compressor (1) is communicated with a fin refrigerant inlet (2.1) of the fin condenser (2), and a fin refrigerant outlet (2.2) of the fin condenser (2) is communicated with a cold-heat exchanger liquid inlet (3.1) of the cold-heat exchanger (3); a liquid outlet (3.2) of the cold-heat exchanger (3) is communicated with an evaporator refrigerant inlet (9.1) of the evaporator (9), and a pipeline between the cold-heat exchanger and the evaporator refrigerant inlet is sequentially communicated with the stop valve (4), the filter (5), the stop valve (4), the liquid sight glass (6), the liquid pipe electromagnetic valve (7) and the thermostatic expansion valve (8); an evaporator refrigerant outlet (9.2) of the evaporator (9) is communicated with a cold-heat exchanger gas inlet (3.3) of the cold-heat exchanger (3), and a cold-heat exchanger gas outlet (3.4) of the cold-heat exchanger (3) is communicated with a compressor suction pipe (1.2) of the compressor (1);

high-temperature side water loop:

the high-temperature water inlet (25) is communicated with an evaporator water inlet (9.3) of the first refrigeration system (1 #); the water outlet (9.4) of the evaporator of the first refrigerating system (1#) is communicated with the high-temperature water outlet (24), and a water branch valve (10) and a water flow switch (19) are arranged on a pipeline between the evaporator and the high-temperature water outlet; the high-temperature water outlet (24) is communicated with a high-temperature side milk heat exchanger water inlet (28.1) of the high-temperature side milk heat exchanger (28); a water outlet (28.2) of the high-temperature side milk heat exchanger (28) is communicated with a water inlet (30.1) of a high-temperature side water tank of the high-temperature side water tank (30), and a waterway valve (29) is arranged on a pipeline between the water outlet and the high-temperature side milk heat exchanger; a high-temperature side water tank water outlet (30.2) of the high-temperature side water tank (30) is communicated with the high-temperature water inlet (25), and a waterway valve (29), a high-temperature water pump (31) and the waterway valve (29) are sequentially arranged on a pipeline between the high-temperature side water tank and the high-temperature water tank;

low-temperature side water loop:

the low-temperature water inlet (27) is communicated with an evaporator water inlet (9.3) of the third refrigerating system (3 #); a water outlet (9.4) of the evaporator of the third refrigerating system (3#) is communicated with the low-temperature water outlet (26), and a water branch valve (10) and a water flow switch (19) are arranged on a pipeline between the evaporator and the low-temperature water outlet; the low-temperature water outlet (26) is communicated with a low-temperature side milk heat exchanger water inlet (32.1) of the low-temperature side milk heat exchanger (32); a water outlet (32.2) of the low-temperature side milk heat exchanger (32) is communicated with a water inlet (33.1) of a low-temperature side water tank of the low-temperature side water tank (33), and a water way valve (29) is arranged on a pipeline between the water outlet and the water inlet; a low-temperature side water tank water outlet (33.2) of the low-temperature side water tank (33) is communicated with the low-temperature water inlet (27), and a water path valve (29), a low-temperature water pump (34) and the water path valve (29) are sequentially arranged on a pipeline between the low-temperature side water tank and the low-temperature water tank;

a standby water loop:

the water inlet water receiving point (42) is positioned between the high-temperature water inlet (25) and the low-temperature water inlet (27), and a high-temperature water valve (22) and a low-temperature water valve (23) are respectively arranged between the water inlet water receiving point and the high-temperature water inlet (25) and between the water inlet water receiving point and the low-temperature water inlet (27); the water outlet water receiving point (41) is positioned between the high-temperature water outlet (24) and the low-temperature water outlet (26), and a high-temperature water valve (22) and a low-temperature water valve (23) are respectively arranged between the water outlet water receiving point and the high-temperature water outlet (24) and between the water outlet water receiving point and the low-temperature water outlet (26);

the water inlet water receiving point (42) is communicated with an evaporator water inlet (9.3) of the second refrigerating system (2 #); a water outlet (9.4) of the evaporator of the second refrigeration system (2#) is communicated with the water outlet water receiving point (41), and a water branch valve (10) and a water flow switch (19) are arranged on a pipeline between the evaporator and the water outlet water receiving point;

a milk circulation loop:

the milk inlet (37) is communicated with a high-temperature side milk inlet (28.4) of the high-temperature side milk heat exchanger (28), and a milk valve (35) is arranged on a pipeline between the milk inlet and the high-temperature side milk heat exchanger; a high-temperature side milk outlet (28.3) of the high-temperature side milk heat exchanger (28) is communicated with a low-temperature side milk heat exchanger inlet (32.4) of the low-temperature side milk heat exchanger (32), and a milk valve (35) is arranged on a pipeline between the high-temperature side milk heat exchanger and the low-temperature side milk heat exchanger; and a low-temperature side milk heat exchanger outlet (32.3) of the low-temperature side milk heat exchanger (32) is communicated with the milk outlet (36), and a milk valve (35) is arranged on a pipeline between the low-temperature side milk heat exchanger outlet and the milk outlet.

2. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 1, wherein: the device also comprises a measurement and control branch consisting of a high-pressure meter (14), a high-pressure controller (15), a high-low pressure controller (16), a low-pressure meter (17) and a low-pressure controller (18) which are sequentially communicated, and an electric control box (40) communicated with the high-pressure meter (14), the high-pressure controller (15), the high-low pressure controller (16), the low-pressure meter (17) and the low-pressure controller (18); the front end of the measurement and control branch is connected to a pipeline at a gas outlet (3.4) of the cold-heat exchanger and a pipeline at an exhaust pipe (1.1) of the compressor through a pressure maintaining joint (12).

3. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 2, wherein: the compressor air suction pipe (1.2) is communicated with the evaporator refrigerant outlet (9.2) through a pipeline, and a bypass electromagnetic valve (38) is arranged on the pipeline.

4. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 3, wherein: and another pressure maintaining joint (12) and an exhaust valve (13) are sequentially arranged between the pressure maintaining joint (12) at the front end of the measurement and control branch and the intersection point of the pipelines of the compressor air suction pipe (1.2) and the bypass electromagnetic valve (38).

5. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 3, wherein: and a fin condenser condensing fan (2.3) is arranged at the top of the fin condenser (2).

6. The pasture cooling device of the multi-temperature section air cooling box type water chilling unit according to claim 2, characterized in that: the utility model discloses a cold water machine set, including cold water set (A), fin condenser (2), fin condenser condensing fan (2.3), the outside panel beating boxboard of condenser that set up at fin condenser (2) top, high pressure controller (15), high low pressure controller (16), low pressure controller (18) locate the upper strata, lower floor is located to compressor (1), cold and heat exchanger (3), stop valve (4), filter (5), liquid sight glass (6), liquid pipe solenoid valve (7), thermal expansion valve (8), evaporimeter (9), high-pressure gage (14), low-pressure gage (17), water flow switch (19), bypass solenoid valve (38) and electric cabinet (40).

7. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 1, wherein: the top parts of the high-temperature side water tank (30) and the low-temperature side water tank (33) are respectively provided with a high-temperature side water tank overflow pipe (30.4), a high-temperature side water tank water replenishing pipe (30.3), a low-temperature side water tank overflow pipe (33.4) and a low-temperature side water tank water replenishing pipe (33.3), and the bottom parts of the high-temperature side water tank overflow pipe and the low-temperature side water tank water discharge pipe (30.5) are respectively provided with a high-temperature side water tank drain pipe and a low-temperature side water tank drain pipe (33.5);

a high-temperature side water tank ball float valve (30.6) and a low-temperature side water tank ball float valve (33.6) are respectively arranged in the high-temperature side water tank water replenishing pipe (30.3) and the low-temperature side water tank overflow pipe (33.4), and the high-temperature side water tank ball float valve (30.6) and the low-temperature side water tank ball float valve (33.6) are respectively positioned in the high-temperature side water tank (30) and the low-temperature side water tank (33); and a high-temperature side water tank drain valve (30.7) and a low-temperature side water tank drain valve (33.7) are respectively arranged on the high-temperature side water tank drain pipe (30.5) and the low-temperature side water tank drain pipe (33.5).

8. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 1, wherein: the evaporator (9) is a plate evaporator made of 304 stainless steel, and the welding form is brazing type; the high-temperature side milk heat exchanger (28) and the low-temperature side milk heat exchanger (32) are plate heat exchangers made of 304 stainless steel or 316L stainless steel; the water inlet and outlet pipelines of the high-temperature side water tank (30) and the low-temperature side water tank (33) are made of 304 stainless steel.

9. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 1, wherein: the compressor (1) is a totally-enclosed scroll compressor using an environment-friendly refrigerant R410A.

10. The pasture cooling equipment of the multi-temperature-section air-cooled box type water chilling unit as claimed in claim 1, wherein: the cold-heat exchanger (3) is a vertical heat exchanger.