Water heater

Abstract

The invention relates to the technical field of household appliances, in particular to a water heater. The water heater comprises a first evaporator, an air pipe unit, a first heat exchanger, a second evaporator and a second heat exchanger. The first evaporator is provided with a first inner cavity, the bottom of the first inner cavity communicates with a first switch valve for controlling gas introduction, the top of the first inner cavity communicates with a first vacuum pump, the first vacuum pump pumps out gas in the first inner cavity and enables the pressure in the first inner cavity to reach a preset condition, and liquid in the first inner cavity is evaporated; the air pipe unit comprises a fan and a coil pipe, cold fluid at the lower end of the first evaporator flows back to the upper end of the first evaporator after flowing into the coil pipe, and cold air emitted out of the coil pipe is blown into the indoor environment through the fan; the first heat exchanger communicates with the first vacuum pump, and gas pumped out by the first vacuum pump is condensed into liquid after passing through the first heat exchanger. According to the water heater, the heat utilization efficiency is improved, and the efficiency coefficient of the water heater is greatly improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of household appliances, in particular to a hot water machine. BACKGROUND

[0002] The air source heat pump is a heat pump machine taking outdoor air as heat source, in operation, the heat transfer working medium in the evaporator absorbs heat from the environment in the air when evaporating, the working medium vapor rises in pressure and temperature after being compressed by the compressor, the high-temperature vapor condenses into liquid when passing through the special annular pipe outside the water storage tank, and the heat of the high-temperature vapor is transferred to the water in the water storage tank, so as to produce hot water for production and life.

[0003] The evaporator temperature of the hot water machine using the air source heat pump needs to be maintained at a certain temperature to ensure the normal occurrence of evaporation, with the evaporation process, the temperature of the surrounding environment and the evaporator will inevitably drop, and in order to maintain the temperature of the evaporator, additional energy supply is needed, which determines that the coefficient of performance (COP) of the existing air source heat pump hot water machine is low, especially in low temperature environment. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a hot water machine which can improve the coefficient of performance of the hot water machine.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a hot water machine, which comprises a first evaporator, an air duct unit, a first heat exchanger, a second evaporator and a second heat exchanger. The first evaporator is provided with a first inner cavity, the bottom of the first inner cavity is communicated with a first switch valve for controlling the input of gas, and the top of the first inner cavity is communicated with a first vacuum pump. The first vacuum pump extracts the gas in the first inner cavity and makes the pressure in the first inner cavity reach a preset condition, and the liquid in the first inner cavity occurs evaporation phenomenon; the air duct unit comprises a fan and a coil pipe, the cold fluid at the lower end of the first evaporator flows into the coil pipe and then backflows to the upper end of the first evaporator, and the cold air emitted outside the coil pipe is blown to the environment by the fan; the first heat exchanger is communicated with the first vacuum pump, and the gas extracted by the first vacuum pump is condensed into liquid after passing through the first heat exchanger; the second evaporator is provided with a second inner cavity, the bottom of the second inner cavity is communicated with a second switch valve for controlling the input of gas, and the top of the second inner cavity is communicated with a second vacuum pump. The second vacuum pump extracts the gas in the second inner cavity and makes the pressure in the second inner cavity reach a preset condition, and the liquid in the second inner cavity occurs evaporation phenomenon, and the liquid in the second evaporator backflows after being heated by the first heat exchanger; the second heat exchanger is communicated with the second vacuum pump, and the high-temperature gas extracted by the second vacuum pump produces hot water after passing through the second heat exchanger.

[0006] The hot water machine provided by the embodiments of the present application can ensure the heat supply of the second evaporator by setting the first heat exchanger to conduct the heat absorbed by the heat transfer medium in the first evaporator to the second evaporator while the first evaporator is refrigerated, and the hot water is prepared by the high-temperature gas evaporated by the second evaporator via the second heat exchanger. The liquid in the first evaporator and the second evaporator can be evaporated at a lower temperature by setting the switch valve and the vacuum pump to control the vacuum degree, and a too high temperature does not need to be maintained. Meanwhile, the heat absorbed in the refrigeration process is used to heat the hot water machine by connecting the hot water machine with the refrigeration machine in series, the heat utilization efficiency is increased, and the COP of the hot water machine is greatly improved.

[0007] In some embodiments, the liquid in the first evaporator and the second evaporator is water.

[0008] In some embodiments, the first porous plate is arranged above the first switch valve and the first inner cavity communication port at the bottom of the first inner cavity, and the second porous plate is arranged above the second switch valve and the second inner cavity communication port at the bottom of the second inner cavity.

[0009] In some embodiments, the outer edge of the first porous plate is completely attached to the inner wall of the first evaporator, and the outer edge of the second porous plate is completely attached to the inner wall of the second evaporator.

[0010] In some embodiments, the cavity wall at the top of the first evaporator and the second evaporator is respectively provided with a plurality of baffles, the plurality of baffles in the first evaporator are arranged below the air exhaust port of the first vacuum pump, and the plurality of baffles in the second evaporator are arranged below the air exhaust port of the second vacuum pump.

[0011] In some embodiments, the baffles in the first evaporator are provided with two baffles which are installed staggered, and the baffles in the second evaporator are provided with two baffles which are installed staggered.

[0012] In some embodiments, the first liquid storage tank is further included, and the first liquid storage tank is used to provide the liquid to the first evaporator and receive the liquid condensed by the first heat exchanger.

[0013] In some embodiments, the second liquid storage tank is further included, and the second liquid storage tank is used to provide the liquid to the second evaporator and receive the liquid condensed by the second heat exchanger.

[0014] In some embodiments, the second liquid storage tank is provided with a first liquid inlet and a first liquid outlet.

[0015] In some embodiments, the third liquid storage tank is further included, and the liquid in the third liquid storage tank is returned after being heated by the second heat exchanger.

[0016] In some embodiments, the third liquid storage tank is provided with a second liquid inlet and a second liquid outlet.

[0017] In some embodiments, the first switch valve and the second switch valve are both needle valves.

[0018] In some embodiments, the air pressure in the first inner cavity and the second inner cavity is between 150 mbar and 300 mbar. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which do not limit the scope of embodiments, in which like references indicate similar elements. The drawings in the figures are not necessarily to scale, the emphasis being placed upon illustrating the principles of embodiments.

[0020] Figure 1 is a structural schematic diagram of a water heater provided by some embodiments of the present application;

[0021] Figure 2 is a phase diagram of water.

[0022] BRIEF DESCRIPTION OF DRAWINGS: 11 - first evaporator; 111 - first inner cavity; 112 - first switch valve; 113 - first vacuum pump; 114 - first porous plate; 12 - air duct unit; 121 - fan; 122 - coil pipe; 13 - first heat exchanger; 14 - second evaporator; 141 - second inner cavity; 142 - second switch valve; 143 - second vacuum pump; 144 - second porous plate; 15 - second heat exchanger; 16 - baffle; 17 - first liquid storage tank; 18 - second liquid storage tank; 181 - first liquid inlet; 182 - first liquid outlet; 19 - third liquid storage tank; 191 - second liquid inlet; 192 - second liquid outlet. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, even without these technical details and based on various changes and modifications of the following embodiments, the technical solutions claimed by the present application can be implemented. The following embodiments are classified for the purpose of description, and should not constitute any limitation on the specific embodiments of the present application, and the embodiments can be combined with each other under the premise of not contradicting.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and the claims of this application and the above drawings description use the terms "comprising", "comprises" and "having" and any variations thereof, which are intended to cover not exclusively including.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0026] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] In the subtropical and tropical regions, in order to improve the quality of life and adapt to global warming, air conditioners and water heaters are increasingly popular in residential and commercial buildings. Air source heat pump is a heat pump machine using outdoor air as heat source. In operation, the heat transfer working medium in the evaporator absorbs heat from the environment in the air when evaporating, and the working medium vapor rises in temperature and pressure after being compressed by the compressor. The high-temperature vapor is condensed into liquid when passing through the special annular pipe on the outer surface of the water tank, and the heat of the high-temperature vapor is transferred to the water in the water tank, thereby producing hot water for production and life.

[0028] The temperature of the evaporator of the water heater using the air source heat pump needs to be maintained at a certain temperature to ensure the normal evaporation. With the progress of the evaporation process, the temperature of the indoor environment and the evaporator will inevitably decrease. In order to maintain the temperature of the evaporator, additional energy supply is needed, which determines that the coefficient of performance (COP, Coefficient Of Performance) of the existing air source heat pump water heater is low, especially in low temperature environment.

[0029] Therefore, in order to improve the COP of the water heater, the water heater provided by the embodiments of the present application is provided with the first heat exchanger, so that the heat absorbed by the heat transfer working medium in the first evaporator is conducted to the second evaporator while the first evaporator is refrigerated, so as to ensure the heat supply of the second evaporator, and the high-temperature gas evaporated by the second evaporator is used to make hot water after passing through the second heat exchanger. Since the first evaporator and the second evaporator are provided with the switch valve and the vacuum pump for controlling the vacuum degree, the liquid therein can be controlled to evaporate at a lower temperature without the need to maintain a too high temperature. At the same time, the heat absorbed in the refrigeration process is used to heat the water heater by being connected in series with the refrigeration machine, so as to increase the heat utilization efficiency and greatly improve the COP of the water heater.

[0030] The water heater provided by some embodiments of the present application will be described below. Figure 1 The water heater provided by some embodiments of the present application will be described below.

[0031] As shown in Figure 1 some embodiments of the present application, the water heater comprises a first evaporator 11, an air duct unit 12, a first heat exchanger 13, a second evaporator 14 and a second heat exchanger 15. The first evaporator 11 is provided with a first inner cavity 111, the bottom of the first inner cavity 111 is communicated with a first switch valve 112 for controlling the gas to enter, and the top of the first inner cavity 111 is communicated with a first vacuum pump 113. The first vacuum pump 113 can extract the gas in the first inner cavity 111 and make the pressure in the first inner cavity 111 reach a preset condition, so that the liquid in the first inner cavity 111 can evaporate. The air duct unit 12 comprises a fan 121 and a coil pipe 122. The cold fluid at the lower end of the first evaporator 11 flows into the coil pipe 122 and then flows back to the upper end of the first evaporator 11, and the cold air emitted by the coil pipe 122 is blown into the indoor environment by the fan 121. The first heat exchanger 13 is communicated with the first vacuum pump 113, and the gas extracted by the first vacuum pump 113 is condensed into liquid after passing through the first heat exchanger 13. The second evaporator 14 is provided with a second inner cavity 141, the bottom of the second inner cavity 141 is communicated with a second switch valve 142 for controlling the gas to enter, and the top of the second inner cavity 141 is communicated with a second vacuum pump 143. The second vacuum pump 143 can extract the gas in the second inner cavity 141 and make the pressure in the second inner cavity 141 reach a preset condition, so that the liquid in the second inner cavity 141 can evaporate. The liquid in the second evaporator 14 flows back after being heated by the first heat exchanger 13. The second heat exchanger 15 is communicated with the second vacuum pump 143, and the high-temperature gas extracted by the second vacuum pump 143 is used to make hot water after passing through the second heat exchanger 15.

[0032] Furthermore, the shapes and materials of the first evaporator 11, the air duct unit 12, the first heat exchanger 13, the second evaporator 14, and the second heat exchanger 15 are not limited as long as they meet actual needs. The first evaporator 11 and the air duct unit 12, the first evaporator 11 and the first heat exchanger 13, the first heat exchanger 13 and the second evaporator 14, and the second evaporator 14 and the second heat exchanger 15 are all connected by pump pipes ( Figure 1 The center line represents the pipeline, and the arrows indicate the direction of liquid flow), thereby circulating the liquid and exchanging heat. Both the first vacuum pump 113 and the second vacuum pump 143 are oil-free vacuum pumps. They can be piston, screw, air foil turbine, magnetic levitation turbine, or any other type of vacuum pump, as long as they can produce the required vacuum level. The evaporation of the liquid in the first inner cavity 111 absorbs heat, causing the fluid at the lower end of the inner cavity to cool (to no less than 15 degrees Celsius). This cool fluid is then used by the air duct unit 12 to generate refrigeration.

[0033] At the same time, the evaporated high-temperature gas and air mixed fluid (no less than 20 degrees Celsius) is sucked away by the first vacuum pump 113 and compressed (no less than 35 degrees Celsius). It then enters the first heat exchanger 13, where the high-temperature gas condenses and releases heat, thereby heating the liquid flowing out of the second evaporator 14 (no less than 30 degrees Celsius), raising the temperature of the liquid in the second vaporizer 14 and providing some heat for the evaporation of the liquid in the second evaporator 14. The evaporated high-temperature gas and air mixed fluid (no less than 30 degrees Celsius) in the second evaporator 14 is sucked away by the second vacuum pump 143 and compressed (no less than 55 degrees Celsius). The high-temperature gas enters the second heat exchanger 15, where it condenses and releases heat, producing hot water (no less than 50 degrees Celsius) for production and daily use.

[0034] In addition, as needed, a third evaporator can be connected in series with the second heat exchanger 15, or a fourth evaporator can be connected in series after the third evaporator through the third heat exchanger to provide liquid with a higher temperature. The number of evaporators in series is not limited.

[0035] It should be noted that according to the phase diagram of equilibrium substances (such as Figure 2 From the phase diagram of water, we can see that the lower the external pressure, the lower the temperature required for the liquid to evaporate. Therefore, by controlling the pressure outside the liquid, we can control the evaporation of the liquid at different temperatures.

[0036] In actual operation, liquid evaporation is a dynamic process. According to the kinetic theory of liquid evaporation, the formula for liquid evaporation rate dN / dt is:

[0037]

[0038] In the above formula, ΔP is the pressure difference between the equilibrium pressure of the liquid at temperature T and the actual partial pressure of the gas, N Ais Avogadro number, M is molecular weight, R is gas constant, A is liquid-gas interface area, exp(-E act / RT) is the probability that a liquid molecule at the interface has enough energy to escape into the gas phase, E act is the activation energy of the evaporation process.

[0039] From the above formula, to enhance the evaporation rate, the controllable parameters A and ΔP can be increased. The vacuum degree in the evaporator is controlled by setting a switch valve and a vacuum pump in the first evaporator 11 and the second evaporator 14, so as to control the actual partial pressure of the gas, and further control ΔP; a certain amount of air is introduced into the evaporator through the switch valve to form bubbles, so as to increase the liquid-gas interface area A. The water heater provided by the application starts the bubble-enhanced evaporation mechanism by setting a switch valve and a vacuum pump, and realizes evaporation of the liquid at a preset temperature.

[0040] The water heater provided by some embodiments of the application sets the first heat exchanger 13, absorbs the heat of the heat transfer working medium in the first evaporator 11 into the second evaporator 14 while refrigerating the first evaporator 11, ensures the heat supply of the second evaporator 14, and obtains hot water after the high-temperature gas evaporated from the second evaporator 14 passes through the second heat exchanger 15. Since the first evaporator 11 and the second evaporator 14 are provided with a switch valve and a vacuum pump for controlling the vacuum degree, the liquid therein can be controlled to evaporate at a relatively low temperature, without the need to maintain a too high temperature. At the same time, by being connected in series with the refrigeration machine, the heat absorbed in the refrigeration process is used to heat the water heater, which increases the heat utilization efficiency and greatly improves the coefficient of performance of the water heater.

[0041] In some embodiments of the application, the liquid in the first evaporator 11 and the second evaporator 14 is water.

[0042] That is, the refrigerant of the water heater provided by the embodiments of the application is water. The refrigerant used in the air conditioners and air source heat pump water heaters at present is generally the third-generation synthetic hydrofluorocarbon (HFCs) compound, or even the second-generation refrigerant such as chlorofluorocarbon (CFCs) compound which is forbidden. However, since the synthetic hydrofluorocarbon compound and the chlorofluorocarbon compound cause damage to the ozone layer in the atmospheric environment and are one of the reasons for global warming, their use is strictly limited. Therefore, the refrigeration and heat pump industry must consider using natural refrigerants with low ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential), including carbon dioxide, ammonia, propane and water.

[0043] Water possesses exceptional physical and chemical properties, including zero ODP, zero GWP, high heat of vaporization, high theoretical COP, non-toxicity, safety concerns, widespread availability, low cost, no quality requirements, no regulatory restrictions, high chemical stability, and non-flammability. Its heat of vaporization at room temperature is 44 kJ / mol (kilojoules per mole), offering significant advantages over other natural refrigerants.

[0044] like Figure 2 As shown in the figure, area A is liquid water, area B is gaseous water, area C is solid water, point X is the triple point, point Y is the boiling point, point Z is the critical point, and line XYZ is the evaporation line. From the phase diagram of water, we can see that the temperature of water at the triple point is 0.01 degrees Celsius and the pressure is 6.11 millibars; while at the boiling point, the temperature of water is 100 degrees Celsius and the pressure is 1013 millibars. This means that on the evaporation line ( Figure 2 The arc line between the gaseous water and the liquid water in the water heater, i.e., the XYZ line), can achieve water evaporation within the range of 0.01 degrees Celsius to 100 degrees Celsius by controlling the pressure of the liquid water. The water heater provided in this application controls the vacuum degree by setting an on-off valve and a vacuum pump in the evaporator, and activates the bubble-enhanced evaporation mechanism, which can achieve water evaporation at a preset temperature.

[0045] Furthermore, existing air conditioning and water heater technologies that use water as a refrigerant seal the evaporator, expansion valve, condenser, and turbo compressor within a vacuum housing, using an external vacuum pump to maintain a vacuum level of 25 millibars. These systems are bulky and difficult to maintain, making them suitable only for large facilities like data centers and unsuitable for standalone air conditioning and water heaters in residential and commercial buildings. The refrigeration and water heater technology provided in this application utilizes bubble-enhanced evaporation technology, requiring only a certain vacuum in the evaporator, eliminating the need for a vacuum housing. This significantly reduces the size of the equipment and makes it suitable for residential and commercial buildings in tropical and subtropical regions.

[0046] In some embodiments of the present application, a first porous plate 114 is provided at the bottom of the first inner cavity 111, above the communication port between the first switch valve 112 and the first inner cavity 111; a second porous plate 144 is provided at the bottom of the second inner cavity 141, above the communication port between the second switch valve 142 and the second inner cavity 141.

[0047] It can be seen from the above analysis that the liquid evaporation rate can be increased by increasing the liquid-gas interface contact area. The first porous plate 114 is arranged above the first on-off valve 112. The gas entering the first inner cavity 111 through the on-off valve first passes through the first porous plate 114, forms more bubbles, and then contacts the liquid in the first inner cavity 111, thereby further increasing the liquid-gas interface contact area and enhancing the evaporation efficiency. The second porous plate 144 has the same effect. The first porous plate 114 and the second porous plate 144 are both made of metal or plastic, have a thickness of about several millimeters, and have a diameter of more than 10 centimeters. The porous plate is provided with a plurality of pores with a pore size of several microns. The pores generate more bubbles, thereby increasing the liquid-gas interface contact area.

[0048] In addition, the large number of small bubbles generated by the porous plate disperses the water vapor in the air into each bubble. The volume of the bubbles increases several times during the rising process of the pressure reduction, causing the partial pressure of water vapor in each bubble to decrease and ΔP in the above formula to be positive, thereby increasing the liquid evaporation rate. The hydrogen bond network and high E act The activation energy of the evaporation process in the above formula, which is about half of the gasification heat of water, causes the evaporation rate to be slow. The generation of a large number of bubbles by the porous plate not only destroys the hydrogen bond network, but also causes high-energy water molecules to have the opportunity to move to the gas-liquid interface and evaporate due to turbulent motion, thereby having a positive effect on the bubble evaporation mechanism.

[0049] In some embodiments of the present application, the outer edge of the first porous plate 114 is completely attached to the inner wall of the first evaporator 11, and the outer edge of the second porous plate 144 is completely attached to the inner wall of the second evaporator 14.

[0050] It should be noted that the outer edge of the first porous plate 114 is attached to the inner wall of the first evaporator 11, and the air entering from the first on-off valve 112 passes through the first porous plate 114, which can increase the number of bubbles, further increase the liquid-gas interface contact area, and enhance the evaporation efficiency. The outer edge of the second porous plate 144 is attached to the inner wall of the second evaporator 14, which has the same effect.

[0051] In some embodiments of the present application, the cavity wall at the top of the first evaporator 11 and the second evaporator 14 is respectively provided with a plurality of baffles 16. The plurality of baffles 16 in the first evaporator 11 are located below the air suction port of the first vacuum pump 113, and the plurality of baffles 16 in the second evaporator 14 are located below the air suction port of the second vacuum pump 143.

[0052] It should be noted that the baffles 16 are not completely attached to the inner wall of the evaporator, or the baffles 16 are provided with holes for gas flow. The baffles 16 are arranged to prevent liquid splashing during vacuum pumping.

[0053] In some embodiments of the present application, the baffle 16 in the first evaporator 11 is provided with two pieces and is installed staggered.

[0054] It should be noted that the baffle 16 is provided with two pieces and is installed staggered, which is a preferred number of single plates and installation method. The actual number of baffle 16 can be 3, 4 or more pieces, and is installed staggered in layers. The evaporated gas is sucked away by the vacuum pump from the gap between the baffle 16. Thus, the suction and splashing of the liquid by the vacuum pump are better avoided.

[0055] In some embodiments of the present application, a first liquid storage tank 17 is further included, which is used to provide liquid to the first evaporator 11 and receive the liquid condensed by the first heat exchanger 13.

[0056] Further, one end of the first liquid storage tank 17 is in communication with the upper end of the first evaporator 11 through a pipeline and a pump, which is used to provide liquid to the first evaporator 11. The other end is in communication with the first heat exchanger 13, which is used to collect the liquid produced after condensation of the first heat exchanger 13. The liquid flows from the first liquid storage tank 17 to the first evaporator 11, then to the first heat exchanger 13, and then flows back into the first liquid storage tank 17, completing the entire liquid circulation process and saving liquid. It should be noted that the communication between the first liquid storage tank 17 and the first evaporator 11 should be located below the baffle 16 described above, so as to avoid the first vacuum pump 113 from sucking the injected liquid.

[0057] In some embodiments of the present application, a second liquid storage tank 18 is further included, which is used to provide liquid to the second evaporator 14 and receive the liquid condensed by the second heat exchanger 15.

[0058] Further, one end of the second liquid storage tank 18 is in communication with the upper end of the second evaporator 14 through a pipeline and a pump, which is used to provide liquid to the second evaporator 14. The other end is in communication with the second heat exchanger 15, which is used to collect the liquid produced after condensation of the second heat exchanger 15. The liquid flows from the second liquid storage tank 18 to the second evaporator 14, then to the second heat exchanger 15, and then flows back into the second liquid storage tank 18, completing the entire liquid circulation process and saving liquid. It should be noted that the communication between the second liquid storage tank 18 and the second evaporator 14 should be located below the baffle 16 described above, so as to avoid the second vacuum pump 143 from sucking the injected liquid.

[0059] In some embodiments of the present application, the second liquid storage tank 18 is provided with a first liquid inlet 181 and a first liquid outlet 182.

[0060] It should be noted that the liquid produced after the condensation of the second evaporator 14 is a high-temperature gas (not less than 55 degrees Celsius) produced after being heated by the first heat exchanger 13 and evaporated and absorbed by the second evaporator 14, and the temperature is relatively high and can be directly used for production and life. The first liquid inlet 181 and the first liquid outlet 182 are arranged on the second liquid storage tank 18 to facilitate the addition of normal-temperature liquid (which can be water) and the obtaining of high-temperature liquid.

[0061] In some embodiments of the present application, a third liquid storage tank 19 is further included, and the liquid in the third liquid storage tank 19 is returned after being heated by the second heat exchanger 15.

[0062] Further, one end of the third liquid storage tank 19 is communicated with the second heat exchanger 15 through a pipeline and a pump to exchange heat with the high-temperature gas in the second heat exchanger 15, and the other end is communicated with the second heat exchanger 15 through a pipeline to return the heated liquid to the third liquid storage tank 19. The circulation process of the liquid from the third liquid storage tank 19 to the second heat exchanger 15 and then back to the third liquid storage tank 19 is completed.

[0063] In some embodiments of the present application, the third liquid storage tank 19 is provided with a second liquid inlet 191 and a second liquid outlet 192.

[0064] It should be noted that the liquid stored in the third liquid storage tank 19 can be water, and the water can be used for production and life after absorbing heat by the second heat exchanger 15 (not less than 50 degrees Celsius). The second liquid inlet 191 and the second liquid outlet 192 arranged on the third liquid storage tank 19 facilitate the addition of normal-temperature water and the obtaining of high-temperature water.

[0065] In some embodiments of the present application, the first switch valve 112 and the second switch valve 142 are both needle valves.

[0066] It should be noted that the needle valve is a kind of fine adjustment valve, and the valve plug is needle-shaped. The fine adjustment valve requires that the valve port gradually increases from closed to opened, and can be continuously and slightly adjusted. The vacuum is created by the vacuum pump, the amount of air entering is controlled by the needle valve, and the optimal COP of the water heater is further controlled. On the one hand, the amount of air entering the needle valve is controlled to control the number of bubbles, increase the contact area of the liquid and the gas, and thus control the evaporation rate of the liquid. On the other hand, the vacuum degree is controlled by balancing the air suction of the vacuum pump and the air intake of the needle valve, so as to realize the evaporation of the liquid under certain temperature and pressure conditions.

[0067] In some embodiments of the present application, the air pressure in the first inner cavity 111 and the second inner cavity 141 is between 150 millibars and 300 millibars.

[0068] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A water heater, characterized by comprising: The application relates to a refrigeration device, which comprises: a first evaporator provided with a first inner cavity, a first switch valve for controlling gas inflow at the bottom of the first inner cavity, and a first vacuum pump at the top of the first inner cavity, wherein the first vacuum pump can extract gas in the first inner cavity and make the pressure in the first inner cavity reach a preset condition, and liquid in the first inner cavity can be evaporated; an air duct unit comprising a fan and a coil pipe, wherein cold fluid at the lower end of the first evaporator flows into the coil pipe, and then flows back to the upper end of the first evaporator, and cold air emitted from the coil pipe is blown to the environment by the fan; a first heat exchanger in communication with the first vacuum pump, wherein the extracted gas passes through the first heat exchanger and is condensed into liquid; a second evaporator provided with a second inner cavity, a second switch valve for controlling gas inflow at the bottom of the second inner cavity, and a second vacuum pump at the top of the second inner cavity, wherein the second vacuum pump can extract gas in the second inner cavity and make the pressure in the second inner cavity reach a preset condition, liquid in the second inner cavity can be evaporated, and the liquid in the second evaporator flows back after being heated by the first heat exchanger; a second heat exchanger in communication with the second vacuum pump, wherein high-temperature gas extracted by the second vacuum pump passes through the second heat exchanger and hot water is prepared.

2. A water heater as claimed in claim 1 wherein, The liquid in the first evaporator and the second evaporator is water.

3. A water heater as claimed in claim 1 wherein, A first porous plate is arranged above the communication port between the first switch valve and the first inner cavity at the bottom of the first inner cavity; and a second porous plate is arranged above the communication port between the second switch valve and the second inner cavity at the bottom of the second inner cavity.

4. A water heater as claimed in claim 3 wherein, The outer edge of the first porous plate is completely attached to the inner wall of the first evaporator, and the outer edge of the second porous plate is completely attached to the inner wall of the second evaporator.

5. A water heater as claimed in claim 1 wherein, A plurality of baffles are arranged at the top of the cavity of the first evaporator and the second evaporator respectively, the plurality of baffles in the first evaporator are arranged below the gas extraction port of the first vacuum pump, and the plurality of baffles in the second evaporator are arranged below the gas extraction port of the second vacuum pump.

6. A water heater as claimed in claim 5 wherein, Two baffles are arranged in the first evaporator and the second evaporator respectively and are staggered.

7. A water heater as claimed in claim 1 wherein, A first liquid storage tank is further arranged, which is used for providing liquid to the first evaporator and receiving liquid condensed by the first heat exchanger.

8. A water heater as claimed in claim 1 wherein, A second liquid storage tank is further arranged, which is used for providing liquid to the second evaporator and receiving liquid condensed by the second heat exchanger.

9. A water heater as claimed in claim 8 wherein, The second liquid storage tank is provided with a first liquid inlet and a first liquid outlet.

10. A water heater as claimed in claim 1 wherein, A third liquid storage tank is further arranged, wherein liquid in the third liquid storage tank flows back after being heated by the second heat exchanger.

11. A water heater as claimed in claim 10 wherein, The third liquid storage tank is provided with a second liquid inlet and a second liquid outlet.

12. A water heater as claimed in claim 1 wherein, The first switch valve and the second switch valve are needle valves.

13. A water heater as claimed in claim 1 wherein, The air pressure in the first inner cavity and the second inner cavity is between 150 mbar and 300 mbar.

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