Cooling and heating integrated defrosting system

Abstract

The invention discloses a cooling and heating integrated defrosting system, and relates to the technical field of cooling and heating combined systems, the cooling and heating integrated defrosting system comprises an evaporator, a compressor, an expansion valve and a condenser, an outlet of the compressor is respectively communicated with the evaporator and the condenser through a Freon main pipe, and a four-way valve is mounted on the Freon main pipe close to the compressor; an expansion valve is mounted on the Freon main pipe between the evaporator and the condenser; an inlet of the compressor is communicated with the liquid storage tank; a hot fluorine defrosting unit is mounted on the Freon main pipe between the compressor and the four-way valve, and is communicated with the liquid storage tank; two Freon passing pipes with different calibers are installed in the evaporator and the condenser, one Freon passing pipe with the large caliber is communicated with the Freon main pipe, and the other Freon passing pipe with the small caliber is communicated with the hot fluorine defrosting unit. According to the cold and hot integrated defrosting system, the comfort degree of indoor personnel can be greatly improved, and defrosting energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration and heating combined systems, and particularly to a hot and cold integrated defrosting system. Background Art

[0002] In winter, frosting on the outdoor unit of an air conditioner can lead to poor heating effect, affect the service life of the air conditioner, and cause some unnecessary air conditioner damage in severe cases. The specific hazards and principles are as follows: 1. The frost layer has a low thermal conductivity and covers the surface of the heat exchanger. When the thickness of the frost layer reaches a certain level, it is equivalent to adding a heat insulation layer on the surface of the heat exchanger, and the heat exchange effect deteriorates rapidly. 2. The heat exchangers of most air conditioners exchange heat through air flow, and the presence of the frost layer will cause blockage, increasing the resistance of air flow, severely reducing the ventilation volume, and thus reducing the heat exchange capacity, further accelerating the formation of the frost layer. 3. The accumulation of the frost layer becomes thicker and may collide with the fan, damaging the fan. Too much frost layer may lead to frequent defrosting and incomplete defrosting, poor heating effect, increased energy consumption, and deterioration of the operation of the heat pump.

[0003] Common defrosting methods include the following: a. Reverse refrigeration defrosting Reverse refrigeration defrosting is one of the most common methods for air conditioners. The system structure and control method are relatively simple. A four-way valve is added to the refrigeration system. When the control system detects that the defrosting condition is met, the four-way valve switches, changing from the heating state to the refrigeration state. The outdoor heat exchanger is in heat dissipation, and hot gas is used to defrost the heat exchanger. During defrosting, the control system detects that the defrosting condition is met - the compressor frequency is reduced or the compressor stops - the indoor and outdoor fans stop running - the four-way valve solenoid valve operates, switching to the refrigeration state - the compressor runs, and high-temperature refrigerant enters the outdoor heat exchanger - defrosting starts - when the defrosting end condition is met - the compressor frequency is reduced or the compressor stops - the four-way valve solenoid valve operates, switching to the heating state - the compressor restarts and runs, and the indoor and outdoor fans start - defrosting ends. When using this method for defrosting, the compressor frequency is reduced or the compressor stops, which easily causes changes in the indoor temperature, is not conducive to ensuring indoor constant temperature, affects the comfort of indoor personnel, and the frequent start-stop and frequency increase-decrease of the compressor increase the working load of the compressor and are likely to affect the life of the compressor. b. Electric defrosting Electric defrosting is to install an electric heating device in the heat exchanger and connect it to the control system. It is simple and easy to implement, but from the perspective of energy consumption, it is not economical. Usually, it is used as a supplement to reverse refrigeration defrosting. However, for some devices without reverse defrosting function, electric defrosting is a simple and feasible method. During the defrosting process, the system detects that the defrosting condition is met - the compressor stops - the indoor and outdoor fans stop - the electric heater is powered on - the defrosting end condition is met - the electric heater is powered off - the compressor, indoor and outdoor fans start - the defrosting ends; c. Water defrosting For the commonly mentioned water defrosting, its key technology is carried out by means of spraying with a spray box. It has problems such as a rough working process, poor spraying effect, water storage and easy water accumulation in the spray box, easy rusting of the spray box and affecting the defrosting effect, neither the defrosting water nor the thawed water is recycled, inevitably causing waste of water resources, and not making use of the condensate water in the operation of the air conditioner.

[0004] At the same time, a large amount of heat is generated by the compressor during the operation of the air conditioner, and it is easy to cause indoor dryness during heating in winter; for existing air conditioners, the condensate water generated during the operation of the air conditioner is not utilized. For example, the condensate water is not used to cool the compressor and then defrost the condenser, and atomized water cannot be provided at the evaporator to increase indoor humidity.

[0005] How to develop a hot and cold integrated defrosting system that can meet the requirements of hot gas defrosting without affecting the indoor temperature and without changing the operating conditions of the compressor, and can utilize the condensate water to meet the requirements of cooling and water defrosting, and improve indoor comfort, energy conservation and environmental protection has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a hot and cold integrated defrosting system to solve the problems listed in the background technology.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: A hot and cold integrated defrosting system of the present invention includes an evaporator, a compressor, an expansion valve and a condenser. The outlet of the compressor is respectively communicated with the evaporator and the condenser through a Freon main pipe, and a four-way valve is installed on the Freon main pipe close to the compressor. An expansion valve is installed on the Freon main pipe between the evaporator and the condenser; the inlet of the compressor is communicated with a liquid storage tank; A hot gas defrosting unit is installed on the Freon main pipe between the compressor and the four-way valve, and the hot gas defrosting unit is communicated with the liquid storage tank; Two Freon through pipes with different diameters are installed in the evaporator and the condenser. One of the thick-diameter Freon through pipes is communicated with the Freon main pipe, and the other thin-diameter Freon through pipe is communicated with the hot gas defrosting unit.

[0008] Preferably, the hot fluorine defrosting unit includes a Freon branch pipe valve for the evaporator, a Freon branch pipe valve for the condenser, and a Freon branch pipe. The inlet of the Freon branch pipe is communicated with the Freon main pipe; the outlet of the Freon branch pipe is communicated with the liquid storage tank; The Freon branch pipe is respectively communicated with the thin-caliber Freon through pipes in the evaporator and the condenser, and the Freon branch pipe valve for the evaporator is installed on the Freon branch pipe close to the evaporator, and the Freon branch pipe valve for the condenser is installed on the Freon branch pipe close to the condenser.

[0009] Preferably, it further includes a condensate recovery unit and a condensate utilization unit, and the condensate recovery unit is communicated with the condensate utilization unit.

[0010] Preferably, the condensate recovery unit includes a water receiving tray and a water collecting bottle. The water receiving tray is placed below the evaporator and the condenser, and the water receiving tray is communicated with the water collecting bottle through a drain pipe; a drain valve is installed below the water collecting bottle.

[0011] Preferably, the condensate utilization unit includes a water pump, an atomizer, and a spray head. The water inlet end of the water pump is communicated with the water collecting bottle through a filter plate; The water outlet end of the water pump is communicated with the atomizer through an atomization water branch pipe, and an atomization valve is installed on the atomization water branch pipe; The water outlet end of the water pump is communicated with the spray head through a cooling water branch pipe.

[0012] Preferably, the cooling water branch pipe is evenly wound around the outer peripheral surface of the compressor, and a cooling valve is installed on the cooling water branch pipe between the water pump and the compressor; A spray valve is installed on the cooling water branch pipe between the compressor and the spray head.

[0013] Preferably, a reflux valve is installed on the cooling water branch pipe between the cooling valve and the spray valve, and the reflux valve is communicated with the drain pipe.

[0014] Preferably, a humidity sensor is installed on the evaporator, and a temperature sensor is installed on the compressor.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are: 1) The hot fluorine defrosting unit is communicated with the Freon main pipe. The high-temperature and high-pressure gas is introduced into the separate hot fluorine defrosting unit through the compressor to complete the defrosting operation, which will not affect the compressor and will not affect the refrigeration and heating operations being carried out indoors; 2) The thick-caliber Freon completes the refrigeration or heating operation through the pipe, and the thin-caliber Freon completes the hot-Freon defrosting operation through the pipe, enabling the hot-Freon defrosting operation to be synchronized with the indoor refrigeration or heating work; 3) The condensate water is pumped to the outer peripheral surface of the compressor by the water pump to cool the compressor, and the condensate water participating in the cooling is sprayed onto the condenser to participate in the defrosting operation. The hot-Freon defrosting and water defrosting cooperate with each other to adapt to the defrosting operation of the condenser during indoor heating in different seasons, and the energy consumption is relatively low during the defrosting process; The hot and cold integrated defrosting system of the present invention enables the defrosting operation to be completed without affecting the indoor temperature by the frequency conversion, start-stop or four-way valve commutation of the compressor, which can greatly improve the comfort of indoor personnel. By cooperating with the condensate water recovery unit and the condensate water utilization unit, it can adapt to the defrosting operations in different seasons, effectively reduce the energy consumption required for defrosting, and avoid the impact of frosting on components. Description of the Drawings

[0016] The present invention will be further described below in conjunction with the drawings.

[0017] Figure 1 It is a schematic diagram of a hot and cold integrated defrosting system of the present invention; Figure 2 It is a working schematic diagram of a hot and cold integrated defrosting system of the present invention (heating mode); Figure 3 It is a working schematic diagram of a hot and cold integrated defrosting system of the present invention (refrigeration mode).

[0018] Description of the reference numerals: 1, water pump; 2, cooling valve; 3, atomizing valve; 4, drain pipe; 5, water receiving tray; 6, evaporator; 7, humidity sensor; 8, atomizer; 9, atomizing water branch pipe; 10, Freon main pipe; 11, compressor; 12, Freon branch pipe valve for evaporator; 13, four-way valve; 14, expansion valve; 15, Freon branch pipe valve for condenser; 16, cooling water branch pipe; 17, spray head; 18, condenser; 19, spraying valve; 20, return valve; 21, temperature sensor; 22, liquid storage tank; 23, water collecting bottle; 24, drain valve; 25, filter plate; 26, Freon branch pipe. Detailed Embodiments

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0020] As Figures 1-3As shown in the figure, a combined cooling and heating defrosting system includes an evaporator 6, a compressor 11, an expansion valve 14, and a condenser 18. The outlet of the compressor 11 is connected to the evaporator 6 and the condenser 18 respectively through a Freon main pipe 10, and a four-way valve 13 is installed on the Freon main pipe 10 near the compressor 11. The expansion valve 14 is installed on the Freon main pipe 10 between the evaporator 6 and the condenser 18. The inlet of the compressor 11 is connected to a liquid storage tank 22. The requirements for indoor cooling and heating are achieved through the four-way valve. A hot Freon defrosting unit is installed on the Freon main pipe 10 between the compressor 11 and the four-way valve 13, and the hot Freon defrosting unit is connected to the liquid storage tank 22. The hot Freon defrosting unit is connected to the Freon main pipe. By passing high-temperature and high-pressure gas into a separate hot Freon defrosting unit through the compressor, the defrosting operation can be completed without affecting the compressor or the cooling and heating operations being carried out indoors. Two Freon passing pipes with different diameters are installed in the evaporator 6 and the condenser 18. One of the thick-diameter Freon passing pipes is connected to the Freon main pipe 10, and the other thin-diameter Freon passing pipe is connected to the hot Freon defrosting unit. The thick-diameter Freon passing pipe completes the cooling or heating operation, and the thin-diameter Freon passing pipe completes the hot Freon defrosting operation, enabling the hot Freon defrosting operation to be synchronized with the indoor cooling or heating work.

[0021] Specifically, the hot Freon defrosting unit includes an evaporator Freon branch pipe valve 12, a condenser Freon branch pipe valve 15, and a Freon branch pipe 26. The inlet of the Freon branch pipe 26 is connected to the Freon main pipe 10. The outlet of the Freon branch pipe 26 is connected to the liquid storage tank 22. The Freon branch pipe 26 is respectively connected to the thin-diameter Freon passing pipes in the evaporator 6 and the condenser 18, and the evaporator Freon branch pipe valve 12 is installed on the Freon branch pipe 26 near the evaporator 6, and the condenser Freon branch pipe valve 15 is installed on the Freon branch pipe 26 near the condenser 18.

[0022] Specifically, it also includes a condensate recovery unit and a condensate utilization unit. The condensate recovery unit is connected to the condensate utilization unit, which can fully recover and utilize the condensate generated during operation, saving energy and being environmentally friendly.

[0023] Specifically, the condensate recovery unit includes a water receiving tray 5 and a water collecting bottle 23. The water receiving tray 5 is placed below the evaporator 6 and the condenser 18, and the water receiving tray 5 is communicated with the water collecting bottle 23 through a drain pipe 4. A drain valve 24 is installed below the water collecting bottle 23. When the condensate in each pipeline is sufficient and the condensate in the water collecting bottle reaches a certain amount, the drain valve opens to drain water outward, ensuring the fluidity of the condensate in the water collecting bottle and circulating the condensate in the water collecting bottle.

[0024] Specifically, the condensate utilization unit includes a water pump 1, an atomizer 8 and a spray head 17. The water inlet end of the water pump 1 is communicated with the water collecting bottle 23 through a filter plate 25. The water outlet end of the water pump 1 is communicated with the atomizer 8 through an atomization water branch pipe 9, and an atomization valve 3 is installed on the atomization water branch pipe 9. When heating in winter, the atomizer can be used to improve the indoor humidity, relieve the problems of excessive skin water loss and dry throat caused by local air dryness, and at the same time can purify the indoor environment, reduce indoor dust. Further, it can increase the continuous atomization water volume of the atomizer and avoid the tendency of frost layer formation on the outer surface of the evaporator. The water outlet end of the water pump 1 is communicated with the spray head 17 through a cooling water branch pipe 16. By spraying water on the outer surface of the condenser through the water pump, the frost layer is melted and washed away by the heat of the water, avoiding affecting the heat exchange effect of the condenser, ensuring unobstructed air flow, reducing energy consumption and avoiding the influence of too thick frost layer on the service life of components such as fans.

[0025] Specifically, the cooling water branch pipe 16 is evenly wound around the outer peripheral surface of the compressor 11. The condensate in the cooling water branch pipe can cool down the temperature generated by the compressor during operation, ensuring the service life of the compressor, and a cooling valve 2 is installed on the cooling water branch pipe 16 between the water pump 1 and the compressor 11. A spray valve 19 is installed on the cooling water branch pipe 16 between the compressor 11 and the spray head 17. After the cooling water branch pipe is heated up by passing through the compressor, spraying the heated condensate on the condenser through the spray head can melt the frost layer on the condenser and make the frost layer fall off from the condenser.

[0026] Specifically, a return valve 20 is installed on the cooling water branch pipe 16 between the cooling valve 2 and the spray valve 19, and the return valve 20 is communicated with the drain pipe 4.

[0027] Specifically, a humidity sensor 7 is installed on the evaporator 6, which can monitor the air humidity at the evaporator. By weighted control of the atomizer operation, the indoor humidity can be kept appropriate. A temperature sensor 21 is installed on the compressor 11, which can provide data support for compressor cooling.

[0028] Working principle: As Figure 2 shown, during heating, the compressor 11 passes high-temperature and high-pressure gas (condensation operation) into the evaporator 6 through the four-way valve 13, dissipates heat to the room through the fan, and the medium-temperature and high-pressure liquid flowing out of the evaporator 6 forms a low-temperature and low-pressure liquid after passing through the expansion valve 14. The low-temperature and low-pressure liquid absorbs heat from the outside in the condenser 18 to form a low-temperature and low-pressure gas, and enters the compressor 11 through the four-way valve 13 to continue the compression cycle; When defrosting is required, the Freon branch valve 15 of the condenser is opened, and the high-temperature and high-pressure gas enters the small-diameter Freon in the condenser through the pipe to participate in the defrosting operation of the condenser. The opening time of the Freon branch valve 15 of the condenser is short, which can effectively prevent the condenser from frosting. Without affecting the indoor temperature by changing the frequency, starting and stopping of the compressor or reversing the four-way valve, the defrosting operation can be completed, which can greatly improve the comfort of indoor personnel. Further, the cooling valve 2 and the spraying valve 19 can be opened, and the condensate water is pumped to the outer peripheral surface of the compressor through the water pump 1 to cool the compressor, and the condensate water participating in the cooling is sprayed onto the condenser to participate in the defrosting operation. By cooperating with hot Freon defrosting and water defrosting, it can adapt to the defrosting operation in different seasons, the defrosting operation of the condenser during indoor heating, and the energy consumption is low during the defrosting process; During winter indoor heating, the indoor air is likely to be dry. According to the monitoring of the humidity sensor 7, the atomizing valve 3 is controlled to open, and water is supplied to the atomizer 8 through the water pump 1 for atomization to maintain the indoor air humidity and improve people's comfort; When the room is cooled, as Figure 3 shown, the four-way valve is reversed, causing the flow direction of the high-temperature and high-pressure gas to change, which is opposite to the flow direction of the high-temperature and high-pressure gas during heating. When only cooling the compressor 11, the cooling valve 2 and the return valve 20 are opened to cool the compressor and improve the service life of the compressor.

[0029] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or seal including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or seal.

[0030] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A cold and hot integrated defrosting system, characterized in that: It includes an evaporator (6), a compressor (11), an expansion valve (14) and a condenser (18). The outlet of the compressor (11) is communicated with the evaporator (6) and the condenser (18) respectively through a Freon main pipe (10), and a four-way valve (13) is installed on the Freon main pipe (10) near the compressor (11). The expansion valve (14) is installed on the Freon main pipe (10) between the evaporator (6) and the condenser (18); the inlet of the compressor (11) is communicated with a liquid storage tank (22); A hot Freon defrosting unit is installed on the Freon main pipe (10) between the compressor (11) and the four-way valve (13), and the hot Freon defrosting unit is communicated with the liquid storage tank (22); Two Freon passing pipes with different diameters are installed in the evaporator (6) and the condenser (18). One of the thick-diameter Freon passing pipes is communicated with the Freon main pipe (10), and the other thin-diameter Freon passing pipe is communicated with the hot Freon defrosting unit.

2. The cold and heat integrated defrosting system according to claim 1, characterized in that: The hot Freon defrosting unit includes an evaporator Freon branch pipe valve (12), a condenser Freon branch pipe valve (15) and a Freon branch pipe (26). The inlet of the Freon branch pipe (26) is communicated with the Freon main pipe (10); the outlet of the Freon branch pipe (26) is communicated with the liquid storage tank (22); The Freon branch pipe (26) is respectively communicated with the thin-diameter Freon passing pipes in the evaporator (6) and the condenser (18), and the evaporator Freon branch pipe valve (12) is installed on the Freon branch pipe (26) near the evaporator (6), and the condenser Freon branch pipe valve (15) is installed on the Freon branch pipe (26) near the condenser (18).

3. The cold and heat integrated defrosting system according to claim 1, characterized in that: It also includes a condensate recovery unit and a condensate utilization unit, and the condensate recovery unit is communicated with the condensate utilization unit.

4. The cold and hot integrated defrosting system according to claim 3, wherein: The condensate recovery unit includes a water receiving tray (5) and a water collecting bottle (23). The water receiving tray (5) is placed below the evaporator (6) and the condenser (18), and the water receiving tray (5) is communicated with the water collecting bottle (23) through a drain pipe (4); a drain valve (24) is installed below the water collecting bottle (23).

5. The integrated hot and cold defrosting system according to claim 4, characterized in that: The condensate utilization unit includes a water pump (1), an atomizer (8) and a spray head (17). The water inlet end of the water pump (1) is communicated with the water collecting bottle (23) through a filter plate (25); The water outlet end of the water pump (1) is communicated with the atomizer (8) through an atomizing water branch pipe (9), and an atomizing valve (3) is installed on the atomizing water branch pipe (9); The water outlet end of the water pump (1) is communicated with the spray head (17) through a cooling water branch pipe (16).

6. The hot and cold integrated defrosting system according to claim 5, characterized in that: The cooling water branch pipe (16) is evenly wound around the outer periphery of the compressor (11), and a cooling valve (2) is installed on the cooling water branch pipe (16) between the water pump (1) and the compressor (11); A spray valve (19) is installed on the cooling water branch pipe (16) between the compressor (11) and the spray head (17).

7. The cold and heat integrated defrosting system according to claim 6, wherein: A reflux valve (20) is installed on the cooling water branch pipe (16) between the cooling valve (2) and the spray valve (19), and the reflux valve (20) is communicated with the drain pipe (4).

8. The cold and hot integrated defrosting system according to claim 1, wherein: A humidity sensor (7) is installed on the evaporator (6), and a temperature sensor (21) is installed on the compressor (11).

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