CN111426086A

CN111426086A - Air-cooled water chiller

Info

Publication number: CN111426086A
Application number: CN202010428741.5A
Authority: CN
Inventors: 曲开成; 张玉全; 张继生
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-07-17

Abstract

The invention discloses an air-cooled water-cooling unit, which comprises an evaporator, wherein the upper end and the lower end of the evaporator are respectively connected with a water outlet pipe and a water inlet pipe, the evaporator is communicated with an air inlet of a compressor, an air outlet of the compressor is connected with an air inlet pipe, the air inlet pipe is communicated with an air inlet of a condenser, one air outlet of the condenser is connected with an air outlet pipe, the air outlet pipe is connected to a drying filter, an outlet of the drying filter is communicated to the evaporator, the other air outlet of the condenser is connected with an exhaust pipe, the exhaust pipe is communicated with the external atmosphere, a fan is separately arranged right opposite to the exhaust pipe, and hot air formed in the condenser is exhausted. The invention solves the problem that the air-cooled water cooling unit cannot effectively dissipate heat because of poor heat exchange effect caused by high outdoor temperature in summer.

Description

Air-cooled water chiller

Technical Field

The invention relates to an air-cooled water cooling unit, and belongs to the technical field of hydroelectric engineering equipment.

Background

Along with the wide application of the pump station, a plurality of key technical problems which need to be solved urgently appear, wherein the configuration rationality of a technical water supply system of the pump station is particularly important. The technical water supply system of some pump stations only considers lubricating water and cooling water of a main pump and neglects water quality of a heat exchange component, so that blockage, scaling, corrosion and the like of the heat exchange component are caused, the heat exchange performance of the heat exchange component is greatly reduced, and the performance of a main pump set is seriously influenced.

In order to improve the reliability of the operation of the pump station, the characteristic that cooling water can be recycled is utilized, a plate heat exchanger, a coil cooler or a water cooling unit and the like are adopted to form a circulating water supply cooling mode, namely, a closed system water supply mode is a development direction of technical water supply of the pump station at present. Compared with the system energy consumption, reliability, operation maintenance, installation and overhaul and equipment investment of three different modes of a plate type heat exchanger heat exchange technology water supply system, a coil type heat exchanger technology water supply system and an air-cooled water cooling unit heat exchange technology water supply system, the air-cooled water cooler becomes the mainstream choice of small and medium-sized pump stations in the current market. The principle of the air-cooled water chiller is that a shell-and-tube evaporator is utilized to enable water to exchange heat with a refrigerant, a refrigerant system absorbs heat load in water, the water is cooled to generate cold water, and heat is brought to a fin-type condenser through the action of a compressor and then dissipated to outside air through a cooling fan.

However, the existing air-cooled water-cooling machine still has partial problems. Because the motor adopts the forced draft cooling mode, and thrust bearing adopts the natural cooling mode, when the operation in summer because the pump station inside and outside ambient temperature is very high, the heat exchange effect is poor, can not carry out effective heat dissipation. Similar to the principle of an air conditioner, part of running equipment of the air-cooled water cooler needs to be placed outdoors, so that the running environment is severe, and the aspects of maintenance and reliability need to be enhanced.

Disclosure of Invention

The invention aims to provide an air-cooled water-cooling unit aiming at the defects of the prior art, in the water-cooling unit, a liquid refrigerant absorbs the heat of cooling water in an evaporator, is vaporized into low-temperature and low-pressure steam, is sucked by a compressor, is compressed into high-pressure and high-temperature steam, is discharged into a condenser, and a fan forces the condenser to release heat to a cooling medium (air), is condensed into high-pressure liquid, is throttled into a low-pressure and low-temperature refrigerant by a throttle valve, and enters the evaporator again to absorb heat for vaporization, thereby achieving the purpose of circulating refrigeration.

In order to achieve the purpose, the invention adopts the following technical scheme.

The utility model provides an air-cooled water-cooling unit, including the evaporimeter, go up of evaporimeter, outlet pipe and inlet tube are connected respectively to the lower extreme, the air inlet intercommunication of evaporimeter and compressor, the intake pipe is connected to the gas outlet of compressor, the intake pipe communicates with the air inlet of condenser, connect the outlet duct on the gas outlet of condenser, the outlet duct is connected to drier-filter, drier-filter's export communicates to the evaporimeter, connect the exhaust pipe on another gas outlet of condenser, exhaust pipe and external atmosphere intercommunication, fan disconnect-type sets up the face-to-face at the exhaust pipe, pass through the exhaust pipe with the hot-air that forms in the condenser and arrange to the external atmosphere in.

The water inlet pipe and the water outlet pipe can be provided with damping joints to reduce vibration transmitted from a booster pipeline pump and the like, so that damage to the water cooling unit caused by vibration is avoided.

The compressor is the core of the whole water cooling unit, and low-temperature gas is compressed into high-temperature gas to realize heat conversion. The condenser cools the superheated steam of the high-temperature and high-pressure refrigerant discharged from the compressor into liquid or gas-liquid mixture.

The fan is the axial-flow fan, through forced convection to the air is coolant, takes away the heat that releases in the condenser through the exhaust pipe for in the heat is faster transmits to natural environment.

Preferably, a thermostatic expansion valve is connected between the drying filter and the evaporator. The thermostatic expansion valve controls the flow of refrigerant into the evaporator by sensing the superheat of the gaseous refrigerant at the evaporator outlet, the refrigerant being R401A refrigerant.

Preferably, the air inlet pipe is provided with a low-pressure controller, and the air outlet pipe is provided with a high-pressure controller.

Preferably, a throttle valve is connected between the condenser and the compressor.

Preferably, the condenser uses a copper tube through integral aluminum sheet construction of air coolant.

Preferably, the evaporator is a shell-and-tube evaporator.

The invention can adopt the full-automatic computer control of an electric control system to realize manual/automatic switching, measures, controls and adjusts parameters such as suction and discharge pressure, refrigerant water, cooling water inlet and outlet temperature and the like, displays running time, has the functions of linkage control, refrigerating capacity control and the like, and has the safety protection functions of high-low pressure protection of a compressor, overheat protection, low water level alarm, low water temperature anti-icing alarm and the like.

Compared with the prior art, the invention has the beneficial effects that:

the invention solves the problem that the air-cooled water cooling unit cannot effectively dissipate heat because of poor heat exchange effect caused by high outdoor temperature in summer. The temperature of inlet water and outlet water can be controlled by the temperature sensor, the refrigerating capacity of the water cooling unit can be controlled under different use conditions, the system reliability is greatly improved, the operation, management and maintenance are more convenient, the service life of the air-cooled water cooling unit is prolonged, and the reliable guarantee is provided for the safe operation of the main pump set. And R401A refrigerant is used for selecting the refrigerant to replace the traditional refrigerant Freon, so that the refrigerant is more environment-friendly, the thermophysical property of the high-pressure refrigerant and the heat exchange performance with the solid wall are improved, and the volume of the device is greatly reduced.

Drawings

Fig. 1 is a schematic diagram of an overall structure of an air-cooled water chiller unit according to an embodiment of the present invention, where the direction indicated by an arrow is a flow direction of water in a pipeline.

In the figure: 1. an air outlet pipe; 2. an air inlet pipe; 3. a water outlet pipe; 4. a water inlet pipe; 5. a high voltage controller; 6. a low-voltage controller; 7. a condenser; 8. a fan; 9. a compressor; 10. drying the filter; 11. a thermostatic expansion valve; 12. an evaporator; 13. an exhaust duct; 14. a throttle valve.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, which is a schematic view of an overall structure of an air-cooled water-cooling unit according to an embodiment of the present invention, the air-cooled water-cooling unit includes a condenser 7, a compressor 9, an evaporator 12, a fan 8, a thermostatic expansion valve 11, a drying filter 10, an air inlet pipe 2, an air outlet pipe 1, an air inlet pipe 4, an air outlet pipe 3, and an electric control system.

The hot cooling water enters the evaporator 12 from the water inlet pipe 4, and after absorbing the heat of the cooling water, the liquid refrigerant R401A in the evaporator becomes cooling water with reduced temperature and is discharged through the water outlet pipe 3. Refrigerant R401A vaporizes into low-temperature low-pressure steam after absorbing the heat of cooling water, and is sucked by the compressor, a low-pressure controller 6 is connected between the compressor 9 and the evaporator 12, the compressor compresses the low-temperature low-pressure steam into high-pressure high-temperature steam and then discharges the high-pressure high-temperature steam into the condenser 7, the fan 8 forces the condenser to release heat to the cooling medium (air) and discharges the hot air to the natural environment through the exhaust pipe 13, the cooled high-pressure steam is sent into the drying filter 10 through the air outlet pipe 1 and the high-pressure controller 5 for drying, and the dried steam is sent into the evaporator through the thermal expansion valve 11 for supplementing the air pressure in the pipeline. Meanwhile, the condensing agent in the condenser is condensed into high-pressure low-temperature liquid, is throttled into low-pressure low-temperature refrigerant by the throttle valve 14, and enters the evaporator again for heat absorption and vaporization, so that the aim of circulating refrigeration is fulfilled. The refrigerant is evaporated, compressed, condensed and throttled in the system to complete a refrigeration cycle in 4 basic processes. The heat flow of the air-cooled water cooling unit is heat exchange between cooling water and a refrigerant, heat energy transfer between the refrigerant and air, and heat dissipation of the cooling water to the natural environment is realized.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an air-cooled water-cooling unit, which is characterized by, including the evaporimeter, outlet pipe and inlet tube are connected respectively to the upper and lower end of evaporimeter, the air inlet intercommunication of evaporimeter and compressor, the intake pipe is connected to the gas outlet of compressor, the intake pipe communicates with the air inlet of condenser, connect the outlet duct on the gas outlet of condenser, the outlet duct is connected to drier-filter, drier-filter's export communicates to the evaporimeter, connect the exhaust pipe on another gas outlet of condenser, the exhaust pipe communicates with external atmosphere, fan disconnect-type sets up in the face-to-face of exhaust pipe, the hot-air that forms in the condenser is passed through the exhaust pipe and is dispersed to.

2. An air-cooled chiller as set forth in claim 1 wherein a thermostatic expansion valve is connected between the desiccant filter and the evaporator.

3. An air-cooled chiller as claimed in claim 1 wherein the inlet duct carries a low pressure controller and the outlet duct carries a high pressure controller.

4. An air-cooled chiller as claimed in claim 3 wherein a throttle valve is connected between the condenser and the compressor.

5. An air-cooled chiller as claimed in claim 1 wherein the condenser is an air coolant of copper tubing through an integral aluminium sheet construction.

6. An air-cooled chiller as set forth in claim 1 wherein the evaporator is a shell and tube evaporator.