CN210624748U

CN210624748U - Cold and warm dual-purpose central air conditioning unit

Info

Publication number: CN210624748U
Application number: CN201921789937.6U
Authority: CN
Inventors: 袁昌华; 刘小江
Original assignee: Hunan Huarui Wuji Energy Saving Technology Co Ltd
Current assignee: Hunan Huarui Wuji Energy Saving Technology Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-05-26
Anticipated expiration: 2029-10-23

Abstract

The utility model provides a cooling and heating dual-purpose central air conditioning unit, which comprises a first heat exchanger, a second heat exchanger, a first throttling device, a first compressor and a first valve group, wherein the first throttling device is connected with the first heat exchanger and the second heat exchanger; the first valve group is used for switching the working states of the first heat exchanger and the second heat exchanger so as to realize that the first heat exchanger absorbs the heat of the interactive medium in the heat exchange tower, and the second heat exchanger releases the heat to the end of a user; alternatively, the first heat exchanger releases heat to the interaction media in the heat exchange column and the second heat exchanger absorbs heat from the user terminal. The utility model provides a dual-purpose central air conditioning unit of changes in temperature switches replacement water route through the valve and switches to avoid the water route to switch the adverse effect that brings.

Description

Cold and warm dual-purpose central air conditioning unit

Technical Field

The utility model relates to a refrigeration heat pump air conditioner technical field especially relates to a dual-purpose central air conditioning unit of changes in temperature.

Background

The current environment is worsening day by day, sea level is rising continuously, glacier thawing is a fact that the situation is not contended, which is related to aggravation of human activities and excessive consumption of mineral fossil energy, new alternative energy is important day by day, energy conservation and emission reduction tasks are far and thoughtless, a technical obstacle is encountered when low-energy-consumption and high-efficiency heating is realized by continuous innovation and adopting new technology, most of centralized heating especially still adopts a traditional boiler heating mode to meet the demands of people, parties and governments set a series of relevant policies for the purpose, coal is vigorously promoted to be changed into electricity to reduce greenhouse gas emission, the purpose of alleviating the gradual worsening environment is achieved, heat source tower related technologies are already appeared for over ten years, many relevant technical workers are involved, although many related problems are solved, large-scale commercial operation is still difficult to realize, the root cause of the problem is that the corrosion prevention problem is not thoroughly solved, the problems of solution loss and freezing pipe caused by upward movement of the freezing point temperature of the solution are solved in different degrees, and the commercial operation cost and the investment cost restrict the rapid popularization of the related technology of the current heat source tower.

In order to solve the problem, the utility model discloses several aspects of combination formula innovations have been made at central air conditioning system to reach and satisfy central screw unit summer both can refrigerate, winter also can last high-efficient stable heating, it is much higher to compare current air-cooled heat pump set energy efficiency ratio, the highest energy efficiency ratio of general air-cooled heat pump set is at 2.8 times, and adopt its energy efficiency ratio of liquid heat source tower unit of preventing frostbite and can reach 5.8 times the most, this is that air-cooled heat pump set is high one time, moreover air-cooled heat pump exists the defrosting problem. Compared with the current water source heat pump, the water source heat pump can be realized only by geographical conditions, the water source heat pump has higher cost, and the water scale is very painful. The heat source tower has no defrosting trouble, and particularly the technology can thoroughly solve the problem that defrosting affects user experience. The air contains abundant latent heat of water vapor and sensible heat of the air, how to convert the latent heat of the water vapor in the air into heat energy which can be utilized by people to benefit human beings, and realize cleaner and pollution-free heating and hot water consumption, the air becomes the research direction of scientific and technological workers of various countries for a long time, and corresponding results are obtained in the field, however, the current biggest obstacle is how to economically change frost, the air energy heat pump in cold winter is afraid of too large content of the water vapor in the air, the normal operation of a heat pump unit can be obstructed when the relative humidity in the air is large, the frost formation of an evaporator can often occur, a lot of electric energy and time are consumed to change the frost, the heating work is stopped when the frost is changed, heat is required to change the frost from a room, and a user can feel uncomfortable, therefore, the utility model adopts the antifreeze to directly exchange heat with the air, and absorbs a great amount of latent heat of the water vapor in the air when the sensible heat process of the air is absorbed, lead to in moisture enters into the antifreeze in the air to constantly dilute the concentration of antifreeze, will freeze when the antifreeze is diluted to freezing point temperature, and then can expand the copper pipe of evaporimeter bad, consequently the utility model discloses a for the system configuration the relevant enrichment facility of rare antifreeze to produced steam passes through heat energy feedback system again and absorbs the steam latent heat in the system and be used for increasing the heat of heating, discharges the comdenstion water outside the solution again, realizes the concentration of negative pressure evaporation heat energy feedback. More importantly the utility model discloses a calcium chloride antifreeze is as exchanging thermal medium with the air, and calcium chloride solution has very strong corrosive action to the metal, if calcium chloride adds the corrosion inhibitor, then the calcium chloride that adds the corrosion inhibitor is very weak (belong to normal life scope) to the metal corrosivity below 25 ℃, and can not the scale deposit yet, have very strong economic use value, not only the running cost is low and investment cost is also cheap, and it is wide to be suitable for the low temperature range, there is not too big influence to the environment, if dispose antifreeze enrichment facility, then it has just not a bit influence to the environment.

It is known that a four-way valve is commonly adopted by a household air conditioner to switch heating and cooling functions, and defrosting depends on the four-way valve to realize reverse operation defrosting; the large and medium central air conditioner can not adopt the four-way valve to switch the functions of the central air conditioner, because the larger four-way valve is difficult to ensure the processing precision requirement to prevent the series leakage between high pressure and low pressure, if the series leakage of refrigerant between high pressure and low pressure is caused, the effect is influenced and the energy is wasted, and the installation of the larger four-way valve is also a great problem, welding is necessary to achieve the higher air tightness requirement, the volume of components in the welding process is too large, the heat dissipation is fast, the oxygen welding temperature requirement can not be met, if a method of increasing heat is adopted, the four-way valve is easy to deform in the heating process, so that the normal operation of a heat pump set can not be realized, the large screw unit can not adopt the four-way valve to realize the switching of the refrigeration and heating functions, but adopts the switching of a water path, which has a completely different effect with the, the latter worrys about the concentration of the antifreeze solution diffusing into the condenser with higher temperature, because the valve adopted for water path switching is difficult to completely close completely at one percent without leakage at all, the heat pump unit operates in winter, even one thousandth of the concentration of the antifreeze solution can cause huge corrosion to the condenser, and as the corrosivity of the calcium chloride antifreeze solution appears under the condition of higher temperature and the scaling problem is serious, the calcium chloride is used as the antifreeze solution, and the service life of the heat source tower heat pump unit adopting the water path switching is about two years, so that the calcium chloride is used as the antifreeze solution and the water path switching mode is inevitably failed to end up, and therefore, people in the industry consistently deny that the calcium chloride can be used as the antifreeze solution of the heat source tower, which is a matter impossible, which is a conclusion that scientific basis is lacked. The utility model discloses a just broken the switching that the large-scale central air conditioning unit refrigeration was realized with the function of heating to the conventional a plurality of cross valve parallel mode of adoption, changed traditional water route switching thinking, the heat source tower antifreeze liquid can not be done with calcium chloride to the single big cross valve of solution simultaneously.

The most critical factor for the success is the selection of the function switching technology, because it is difficult to completely close a large valve, especially when the fluid contains metal rust, the leakage of the fluid will always occur, the calcium chloride solution can diffuse from high concentration to low concentration solution through a tiny gap where the valve is not completely closed, and then the calcium chloride solution enters into a condenser with higher temperature, the corrosion action of the calcium chloride solution on the metal is accelerated when the temperature exceeds 40 ℃, the temperature of the condenser generally exceeds 40 ℃, the copper pipe and the steel plate are easily corroded by the calcium chloride solution when the temperature of the condenser is higher, while the metal in the case of a low-temperature evaporator is completely different and can be a corrosion rate which is hundreds times higher than that of the evaporator, which is a very good thing, and a vicious circle will be generated, the valve is difficult to close, and the valve core leaks water and splashes to the surface of other equipment, so that the motor and the pipeline related to the machine room are corroded.

The water-free cooling and heating integrated central air conditioner with the help of the boiler for heating can realize heating in winter and cooling in summer by using a module unit taking water as a cooling and heating carrier at present, but defrosting is still performed according to a traditional reverse operation mode, so that the user experience can be seriously influenced, and energy is wasted due to the fact that high-low pressure leakage of a four-way valve is caused by frequent switching of reverse operation of the four-way valve. The direct expansion type multi-connected air-cooling unit is not related to a water-cooling and heating dual-purpose air-conditioning unit, the refrigerating and heating energy efficiency ratio of the direct expansion type multi-connected air-cooling unit is very low, the compressor is also used as a conveying pump for conveying cold or heat, the compressor cannot be used as the cold or heat conveying pump, cold and heat transfer is enough by using the compressor to carry out refrigerant phase change, so that the direct expansion type multi-connected air-cooling unit is economical and labor-saving, the gas-phase fluid has the density far lower than that of the liquid fluid, the carried cold and heat are relatively limited, but the pressure of the gas-phase fluid is not inferior to that of the liquid fluid, the energy consumption is larger by overcoming the resistance of a pipeline and the pressure difference to convey a gas-phase refrigerant remotely, and the tail end effect of the tail end of the multi. Therefore, the purpose of heat transfer is achieved by adopting a compressor to form pressure difference on a refrigerant at a short distance and realizing phase change through heat dissipation, then cold or heat is exchanged to liquid water in a heat exchange mode, and the liquid water carrying the cold or heat is remotely conveyed to the tail end of a user by a pump, so that the most economic technical scheme is achieved, and the central air conditioner saves energy compared with a household air conditioner. According to the principle, the technical scheme is that water is used as the heat-carrying and cold-carrying fluid to realize the utilization of clean air conditioning and high-efficiency air energy.

The traditional defrosting mode confuses a user for a long time, the comfort requirement of the user can be met only by adopting the traditional boiler for heating, because the air-cooled heat pump is used for defrosting by taking heat from a room during defrosting, the defrosting time is long, the energy consumption is high, especially under the condition of low ambient temperature and high humidity, the defrosting time is long, the heating time is correspondingly reduced, a vicious circle is formed, the defrosting is required to stop heating, and the heat is required to be taken from the room for defrosting, so that the user cannot tolerate the jiong condition, and the comfort requirement of heating of the user can be met only at the cost of environment sacrifice. The northern air energy heat pump unit in high latitude has extremely poor operation condition, and even if the northern air energy heat pump unit can be operated, the northern air energy heat pump unit is extremely low in energy efficiency ratio and is not as economical and economical as boiler heating. Therefore, some scientific and technological workers adopt a gas-supplementing enthalpy-increasing technical method to solve the problem of poor operation condition of a heat pump in a low-temperature environment, also adopt a multi-stage compression mode to solve the problem, and also adopt a cascade heat pump unit to solve the heating problem under the condition of extremely low temperature, which can increase a lot of equipment investment cost, and in order to meet the requirement of heating in winter, the surplus of equipment capacity during cooling in summer is inevitably overlarge. These problems need to be solved, the utility model discloses a new method is adopted, very low-priced technical scheme is adopted, can solve this type of problem well, this is the same with tonifying qi enthalpy increase technical principle, the compression ratio that is close to the compressor limit is very low to its energy efficiency ratio, can adopt the method that reduces condenser pressure or improve evaporator pressure to realize the purpose that compression ratio reduces, finally reach heat pump set can normal operating under low temperature environment, and the energy efficiency ratio can reach more ideal state, we know that when compression ratio is higher, the gas transmission volume will reduce, and compressor outlet temperature can be very high, this is because gas transmission pressure has formed high temperature gaseous phase refrigerant to be detained in the exit of compressor inadequately, and high temperature gas backward flow is in a new dynamic balance state with advancing, and its backward flow trend just increases when compression ratio increases, there is not more refrigerant fluid that advances can be the heat the reason, in the past, the motor of the compressor is burnt, the refrigerant oil is gasified, and the sealing of the compressor is more difficult, so that the vicious circle is increased continuously. Along with the principle, the fact that the gas delivery quantity of the compressor is increased by using a high-low pressure short circuit mode, the enthalpy value of the compressor is increased, heat at the outlet of the retained compressor is taken away, the pressure of the evaporator is increased, the compression ratio is reduced, the vicious cycle of the heat pump unit is restrained, and the heat pump unit returns to a normal operation state is easily found. In fact, the complex air-supplying enthalpy-increasing technology is not needed to be adopted along the reason, the technical scheme is simple, feasible and reliable, the effect is better, and the user does not need to spend more money and invest in redundant equipment capacity. The liquid fluid displacement device is added in front of the evaporator, an electric heating rod is arranged in the device, the device is simple and practical, the device can be used for maintaining the normal operation of the heat pump in a low-temperature environment and improving the energy efficiency ratio, the installation of the electric heating rod can improve the enthalpy value of the refrigerant of the evaporator, so that the compression ratio of the heat pump unit is reduced, and finally the energy efficiency ratio is improved. The power of the electric heating rod can be adjusted steplessly, heat capacity increase in extremely low temperature periods in winter is achieved, and initial investment cost of users is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a dual-purpose central air conditioning unit of changes in temperature to solve the technical problem that heat pump unit relies on the water route to switch among the prior art.

In order to solve the technical problem, the utility model provides a dual-purpose central air conditioning unit of changes in temperature includes first heat exchanger, second heat exchanger, first throttling arrangement, first compressor and first valves, first throttling arrangement connects first heat exchanger with the second heat exchanger;

the first valve group comprises at least two first switching valves, and the first ends of the first switching valves are connected and then connected with the first compressor; after the second ends of the first switching valves are connected, the first switching valves are connected with the first heat exchanger; after the third ends of the first switching valves are connected, the first switching valves are connected with the first compressor; the fourth ends of the first switching valves are connected and then connected with the second heat exchanger;

the first valve bank is used for switching the working states of the first heat exchanger and the second heat exchanger to realize;

the first heat exchanger absorbs heat of an interaction medium in the heat exchange tower, and the second heat exchanger releases the heat to a user terminal;

alternatively, the first heat exchanger releases heat to the interaction media in the heat exchange column and the second heat exchanger absorbs heat from the user terminal.

Preferably, the central air conditioning unit for both cooling and heating further comprises an enthalpy increasing and compression reducing device, and the first throttling device is connected with the first heat exchanger through the enthalpy increasing and compression reducing device.

Preferably, the central air conditioning unit for both cooling and heating further comprises a second throttling device, a second compressor and a second valve bank, wherein the second throttling device is connected with the first heat exchanger and the second heat exchanger;

the second valve group comprises at least two second switching valves, and the first ends of the second switching valves are connected and then connected with the second compressor; after the second ends of the second switching valves are connected, the second switching valves are connected with the first heat exchanger; after the third ends of the second switching valves are connected, the second switching valves are connected with the second compressor; the fourth ends of the second switching valves are connected and then connected with the second heat exchanger;

the first heat exchanger, the second heat exchanger, the first throttling device, the first compressor and the first valve bank form a refrigerant circulating system; the first heat exchanger, the second throttling device, the second compressor and the second valve group form another refrigerant circulating system.

Preferably, the first compressor and the second compressor are both screw compressors.

Preferably, when the heat exchange tower is a heat source tower, the heat exchange tower comprises a tower body, a solution accumulation disc, a square elbow, a tower body support, a shutter, a spray pipe, tower packing, an air inlet grille, a driven belt pulley, a driving belt pulley, a fixed bearing bush device, a universal shaft, a motor and fan blades;

the solution accumulation disc and the square bent pipe are respectively arranged at the bottom end and the top end of the tower body, the solution accumulation disc is supported on the tower body support, and the shutter is arranged at the air outlet of the square bent pipe; the spray pipe is suspended in the tower body, the tower filler and the air inlet grille are sequentially arranged in the tower body, and the tower filler is arranged towards the spray pipe;

the fixed bearing bush device with the motor install in proper order in the tower body, the cardan shaft runs through fixed bearing bush device, the one end of cardan shaft with the rotation axis connection of motor, the other end of cardan shaft with the drive pulley transmission is connected, driven pulley with the flabellum hangs and locates in the square bent pipe, drive pulley, driven pulley and the flabellum transmission is connected in proper order.

In the central air conditioning unit for both cooling and heating provided by the utility model, the first valve group is used for switching the working states of the first heat exchanger and the second heat exchanger, so that the first heat exchanger absorbs the heat of the interactive medium in the heat exchange tower, and the second heat exchanger releases the heat to the end of a user; alternatively, the first heat exchanger releases heat to the interaction media in the heat exchange column and the second heat exchanger absorbs heat from the user terminal. Therefore, the function of waterway switching in the prior art is replaced by the switching function of the first valve group; the calcium chloride solution can be prevented from diffusing to the side of the fluid with higher temperature due to the switching of the water path, and the equipment can be prevented from being corroded.

Drawings

Fig. 1 is a schematic design diagram of a first embodiment of a cooling and heating dual-purpose central air conditioning unit provided by the present invention;

FIG. 2 is a schematic design diagram of a second embodiment of the central air conditioning unit for cooling and heating purposes provided by the present invention;

FIG. 3 is a schematic design diagram of a third embodiment of a central air conditioning unit for cooling and heating purposes provided by the present invention;

fig. 4 is a schematic view of the heat exchange column shown in fig. 1.

The reference numbers illustrate:

6-heat exchange tower, 7-first circulating pump, 8-first heat exchanger, 9-second heat exchanger, 10-second circulating pump, 11-user terminal, 25-enthalpy increasing and compression ratio reducing device;

1-1-a first compressor, 5-1-a first throttling device and 2-1-a first switching valve;

1-2-a second compressor, 5-2-a second throttling device and 2-2-a second switching valve;

12-square elbow, 13-driven pulley, 14-spray pipe, 15-tower filler, 16-air inlet grille, 17-tower body support, 18-shutter, 19-driving pulley, 20-fixed bearing bush device, 21-universal shaft, 22-motor and 23-solution accumulation disk.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

The utility model provides a dual-purpose central air conditioning unit of changes in temperature.

First embodiment

Referring to fig. 1, the cooling and heating dual-purpose central air conditioning unit provided by the present invention includes a first heat exchanger 8, a second heat exchanger 9, a first throttling device 5-1, a first compressor 1-1 and a first valve set, wherein the first throttling device 5-1 connects the first heat exchanger 8 and the second heat exchanger 9;

the first valve group comprises at least two first switching valves 2-1, and after the first ends of the first switching valves 2-1 are connected, the first switching valves are connected with the first compressor 1-1; after the second ends of the first switching valves 2-1 are connected, the first switching valves are connected with the first heat exchanger 8; after the third ends of the first switching valves 2-1 are connected, the first switching valves are connected with the first compressor 1-1; the fourth end of each first switching valve 2-1 is connected and then connected with the second heat exchanger 9;

the first valve bank is used for switching the working states of the first heat exchanger 8 and the second heat exchanger 9 to realize;

the first heat exchanger 8 absorbs heat of the interaction medium in the heat exchange tower 6, and the second heat exchanger 9 releases heat to the user terminal 11;

alternatively, the first heat exchanger 8 gives off heat to the interaction medium in the heat exchange column 6 and the second heat exchanger 9 absorbs heat from the user terminal 11.

In this embodiment, the number of the first switching valves 2-1 is three.

In this embodiment, the first compressor 1-1 may be a screw compressor.

In winter, the heat exchange tower 6 may be a heat source tower, the exchange medium may be calcium chloride antifreeze, and the exchange medium may also be other types of antifreeze;

the first valve bank is used for switching the working states of the first heat exchanger 8 and the second heat exchanger 9, so that the first heat exchanger 8 is an evaporator, and the second heat exchanger 9 is a condenser;

the working principle of the heat pump unit is as follows:

compressing the refrigerant into the condenser by the operation of the first compressor 1-1, and increasing the temperature of the refrigerant by releasing latent heat to warm medium water circulating at the other side of the condenser through phase change;

the raised heating medium water is brought to a user tail end 11 by a second circulating pump 10 to realize heating;

after releasing latent heat, the refrigerant is condensed into liquid refrigerant, and then the liquid refrigerant flows into the evaporator through the first throttling device 5-1 to absorb the latent heat of the anti-freezing solution on the other side of the evaporator to be evaporated; and is pressed into the condenser by the first compressor 1-1 again to realize the phase-change circulation process of the refrigerant;

after the temperature of the antifreeze releasing latent heat is reduced by about 5 ℃, the antifreeze is injected into the heat source tower by the first circulating pump 7 for spraying and exchanging heat with air;

the sensible heat of the air and the latent heat of the water vapor in the air are absorbed through spraying, the temperature of the air is increased, then the air is pumped into the evaporator by the first circulating pump 7, the latent heat is released to the refrigerant on the other side of the evaporator, and the circulation process of the anti-freezing solution is achieved.

In summer, the heat exchange tower 6 can be a cooling tower, and the exchange medium can be cooling water; the first valve bank is used for switching the working states of the first heat exchanger 8 and the second heat exchanger 9, so that the second heat exchanger 9 is an evaporator, and the first heat exchanger 8 is a condenser;

the working principle is similar to that in winter, and the difference is that the warm medium water driven by the second circulating pump 10 takes away cold rather than heat.

Second embodiment

Referring to fig. 2, based on the dual-purpose central air conditioning unit for cooling and heating provided by the first embodiment of the present invention, the present embodiment provides another dual-purpose central air conditioning unit for cooling and heating, which is different in that:

the central air conditioning unit for both cooling and heating also comprises an enthalpy increasing and compression reducing device 25, and the first throttling device 5-1 is connected with the first heat exchanger 8 through the enthalpy increasing and compression reducing device 25.

The enthalpy-increasing compression-reducing device 25 comprises a liquid refrigerant volume, an electric auxiliary heating device and two electronic valves; one of said electrovalves connecting said first throttling means 5-1 with said first heat exchanger 8, one end of said liquid refrigerant volume being connected with said first heat exchanger 8, the other end of said liquid refrigerant volume being connected with the first throttling means 5-1 through the other electrovalve; and an electric auxiliary heating device is arranged in the volume of the liquid refrigerant and is used for realizing heating in a low-temperature environment.

In winter or in a low-temperature environment, the heat exchange tower 61 may be a heat source tower, the exchange medium may be calcium chloride antifreeze solution, and the exchange medium may also be other types of antifreeze solution;

increasing a volume of liquid refrigerant before the liquid refrigerant enters the evaporator; a set of electric heating device is arranged in the volume, and the electric heating device is started to play a role in increasing enthalpy and reducing compression ratio, so that the heat pump unit can normally and stably run in a low-temperature environment;

the electronic valve connected with the first throttling device 5-1 in series is closed, meanwhile, the other electronic valve is opened, so that liquid refrigerant can enter the volume of the liquid refrigerant, the temperature of the liquid refrigerant is raised through the electric heating device, the pressure of the refrigerant entering the evaporator is correspondingly raised, the gas transmission quantity is raised finally, the compression ratio is reduced, and the electric auxiliary heating enthalpy increasing technical mode is also suitable for the structural form of the double-screw compressor.

Third embodiment

Referring to fig. 3, based on the dual-purpose central air conditioning unit for cooling and heating provided by the first embodiment of the present invention, the present embodiment provides another dual-purpose central air conditioning unit for cooling and heating, which is different in that:

the central air conditioning unit for both cooling and heating also comprises a second throttling device 5-2, a second compressor 1-2 and a second valve bank, wherein the second throttling device 5-2 is connected with the first heat exchanger 8 and the second heat exchanger 9;

the second valve group comprises at least two second switching valves 2-2, and after the first ends of the second switching valves 2-2 are connected, the second switching valves are connected with the second compressor 1-2; after the second ends of the second switching valves 2-2 are connected, the second ends are connected with the first heat exchanger 8; after the third ends of the second switching valves 2-2 are connected, the second switching valves are connected with the second compressor 1-2; after the fourth ends of the second switching valves 2-2 are connected, the fourth ends are connected with the second heat exchanger 9;

the first heat exchanger 8, the second heat exchanger 9, the first throttling device 5-1, the first compressor 1-1 and the first valve group form a refrigerant circulation system; the first heat exchanger 8, the second heat exchanger 9, the second throttling device 5-2, the second compressor 1-2 and the second valve group form another refrigerant circulation system.

In this embodiment, the first compressor 1-1 and the second compressor 1-2 may be both screw compressors.

In this embodiment, the number of the first switching valves 2-1 is two; the number of the second switching valves 2-2 is two.

In winter, the heat exchange tower 61 can be a heat source tower, and the exchange medium can be calcium chloride antifreeze solution; the first valve bank and the second valve bank are used for switching the working states of the first heat exchanger 8 and the second heat exchanger 9, so that the first heat exchanger 8 is an evaporator shared by the first compressor 1-1 and the second compressor 1-2, and the second heat exchanger 9 is a condenser shared by the first compressor 1-1 and the second compressor 1-2;

the working principle is as follows:

the sensible heat of the air and the latent heat of the vapor in the air are sprayed and absorbed in the heat source tower through the antifreeze liquid, so that the temperature of the antifreeze liquid is raised by about 5 ℃, and then the antifreeze liquid is pumped into the shared evaporator by the first circulating pump 7 to release the latent heat to the refrigerant on the other side of the shared evaporator so as to evaporate the refrigerant;

refrigerant evaporated by the shared evaporator is pressed into the shared condenser by the first compressor 1-1 and the second compressor 1-2 to release latent heat to warm water on the other side of the shared condenser, and then is condensed into liquid refrigerant; then flows into the shared evaporator again through the first throttling device 5-1 and the second throttling device 5-2;

meanwhile, the gas refrigerant in the shared evaporator is pressed into the shared condenser by the first compressor 1-1 and the second compressor 1-2 to release latent heat to warm medium water on the other side of the shared condenser, and then is condensed into liquid refrigerant;

then the refrigerant flows into the shared evaporator again through the first throttling device 5-1 and the second throttling device 5-2 to complete the circulation of the refrigerant, and the heating medium water in the shared condenser obtains the latent heat of the refrigerant and then is pumped to a user terminal 11 by the second circulating pump 10 to achieve the purpose of heating.

In summer, the heat exchange tower 6 can be a cooling tower, and the exchange medium can be cooling water; the first valve bank and the second valve bank are used for switching the working states of the first heat exchanger 8 and the second heat exchanger 9, so that the first heat exchanger 8 is a condenser shared by the first compressor 1-1 and the second compressor 1-2, and the second heat exchanger 9 is an evaporator shared by the first compressor 1-1 and the second compressor 1-2;

the working principle is similar to that in winter, except that the second circulation pump 10 delivers warm mordant water to the user end 11 as cold rather than as heat.

Referring to fig. 3 again, the so-called shared condenser is different from the conventional condenser in structure and is divided into two sections, the front section is the first compressor 1-1 and the combination, the rear section is the second compressor 1-2, and the two sections share the heat exchange fluid (refrigerant) on the other side, with the difference between the front and the rear.

The shared evaporator is divided into two halves, one half is combined with the first compressor 1-1, the other half is combined with the second compressor 1-2, and refrigerants in the two halves can exchange heat with antifreeze on the other common side.

The utility model also provides a heat source tower.

Referring to fig. 4, the heat exchanging tower 6 includes a tower body, a solution accumulating plate 23, a square elbow 12, a tower body support 17, a louver 18, a shower pipe 14, a tower packing 15, an air inlet grille 16, a driven pulley 13, a driving pulley 19, a fixed bearing bush device 20, a universal shaft 21, a motor 22 and fan blades;

the solution accumulation disc 23 and the square bent pipe 12 are respectively arranged at the bottom end and the top end of the tower body, the solution accumulation disc 23 is supported on the tower body support 17, and the shutter 18 is arranged at the air outlet of the square bent pipe 12; the spray pipe 14 is suspended in the tower body, the tower packing 15 and the air inlet grille 16 are sequentially arranged in the tower body, and the tower packing 15 is arranged towards the spray pipe 14;

the fixed bearing bush device 20 and the motor 22 are sequentially mounted on the tower body, the universal shaft 21 penetrates through the fixed bearing bush device 20, one end of the universal shaft 21 is connected with a rotating shaft of the motor 22, the other end of the universal shaft 21 is in transmission connection with the driving pulley 19, the driven pulley 13 and the fan blades are suspended in the square elbow 12, and the driving pulley 19, the driven pulley 13 and the fan blades are sequentially in transmission connection.

The heat exchange tower 6 can be used as a heat source tower in winter; can be used as a cooling tower in summer, and can realize the dual-purpose of one tower.

In this embodiment, the square elbow 12 is a 90-degree square elbow 12.

The louvers 18 serve to prevent rain water from drifting into the square elbow 12.

The driving belt pulley 19, the driven belt pulley 13 and the fan blades are sequentially connected in a transmission manner.

The rotation of the fan blades is realized by connecting the fan blades with the driven belt pulley 13 through an impeller shaft and driving the driven belt pulley 13 to rotate through the driving belt pulley 19 by using a belt, and finally, the rotation of the fan blades is caused; the driving belt pulley 19 is connected with a rotating shaft of a motor 22 through a cardan shaft 21;

when the antifreeze (calcium chloride) from the evaporator of the main machine is sprayed downwards onto the filler 15 through the spraying pipe 14 to form a liquid film, the surface of the liquid film is in contact with air and exchanges heat with the air, at the moment, the antifreeze continuously absorbs sensible heat of the air and latent heat of water vapor in the air to enable the temperature of the antifreeze to rise by 3-5 ℃, and then the antifreeze is pumped into the evaporator of the main machine by the tower solution circulating pump again to release the latent heat to the refrigerant, and finally the heat is transferred to the user terminal 11.

The heat source tower has the advantages that the fan motor 22 is effectively protected, calcium chloride spray can be prevented from corroding the shell of the motor 22, rainwater cannot enter the system easily to reduce the upward moving speed of the freezing point temperature of the antifreeze, the calcium chloride solution can be prevented from flowing away to influence the surrounding environment and greatly reduce the probability of corroding equipment, in order to better prevent the upward moving condition of the freezing point temperature of the antifreeze, the spray pipe 14 can be butted with an antifreeze concentration device, and the antifreeze concentration device has the following patent numbers: 201910083051.8.

the related technologies are effectively combined and well matched with operation management, so that the real efficient and stable operation of the heat source tower can be completely realized, the operation faults of equipment are reduced, the operation efficiency of the equipment is improved, particularly, the service life of the equipment is greatly prolonged, the investment cost of the equipment is reduced, the commercial operation can be really realized, and the traditional boiler heating is replaced to make a great contribution to energy conservation and emission reduction.

Although the above embodiments do not describe relatively non-critical components of the heat pump unit, these common related components include: oil and gas separator, refrigeration oil cooling device, filter, desicator, angle valve, electronic valve, economic ware, siphon jar, liquid storage pot, sprayer etc. have not been repeated at this, and the embodiment picture has also not been done relevant sign, and some are just brief form and express, if: user end 11 flow diagrams only use three or four to express many ends, and the flow diagrams of the embodiments of the present invention only identify some essential parts.

The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A central air conditioning unit with dual purposes of cooling and heating is characterized by comprising a first heat exchanger, a second heat exchanger, a first throttling device, a first compressor and a first valve bank, wherein the first throttling device is connected with the first heat exchanger and the second heat exchanger;

alternatively, the first heat exchanger releases heat to the interaction media in the heat exchange column and the second heat exchanger absorbs heat from the user end.

2. The air conditioning unit as set forth in claim 1, further comprising an enthalpy increasing and compression reducing device, wherein said first throttling device is connected to said first heat exchanger through said enthalpy increasing and compression reducing device.

3. The central air conditioning unit for both cooling and heating as set forth in claim 1, further comprising a second throttling device, a second compressor and a second valve set, wherein the second throttling device connects the first heat exchanger and the second heat exchanger;

4. The central air conditioning unit for both cooling and heating as set forth in claim 3, wherein said first compressor and said second compressor are both screw compressors.

5. The central air conditioning unit for both cooling and heating as set forth in any one of claims 1 to 4, wherein when the heat exchange tower is a heat source tower, the heat exchange tower comprises a tower body, a solution accumulation tray, a square elbow, a tower body support, a louver, a shower pipe, tower packing, an air inlet grille, a driven pulley, a driving pulley, a fixed bearing bush device, a universal shaft, a motor and fan blades;