CN114198900B - Domestic hot water circulating system and method without circulating pump - Google Patents
Domestic hot water circulating system and method without circulating pump Download PDFInfo
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- CN114198900B CN114198900B CN202111536615.2A CN202111536615A CN114198900B CN 114198900 B CN114198900 B CN 114198900B CN 202111536615 A CN202111536615 A CN 202111536615A CN 114198900 B CN114198900 B CN 114198900B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
- F24H1/145—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The application relates to the technical field of hot water circulation, in particular to a circulating pump-free household hot water circulation system and method, wherein the system comprises the following components: a gas water heater; a cold water inlet and a hot water outlet are arranged below the gas water heater; the cold water inlet is connected with a water inlet pipe, the water inlet pipe is connected with a first three-way valve, and the first three-way valve is connected with a water supply pipe and a cold water pipe; the hot water outlet is connected with a water outlet pipe, the water outlet pipe is connected with a second three-way valve, the second three-way valve is connected with a hot water pipe and a water diversion pipe, the hot water pipe is connected with a water point, and the hot water pipe is connected with a water return pipe; a circulating heat preservation module is connected below the water return pipe and is connected with a water conduit; the circulation heat preservation module is used for pushing hot water circulation by utilizing gravity difference, pipe network pressure fluctuation and residual kinetic energy. The application solves the technical problems of high cost and poor user experience in the prior art.
Description
Technical Field
The application relates to the technical field of hot water circulation, in particular to a circulating pump-free household hot water circulation system and method.
Background
At present, almost every city resident installs a gas water heater, which can conveniently use hot water. In general, the gas water heater is installed in a kitchen, and the water consumption point includes a kitchen, a bathroom and a washing tub, and the distance between the water consumption point and the gas water heater may be relatively long, for example: the bathroom can be located in a bedroom, the washing tank can be located on a balcony, the hot water pipeline connecting the gas water heater and the water consumption point is relatively long, and when hot water is used each time, the hot water can be discharged after waiting for a period of time and discharging a certain amount of cold water.
In view of this, most households are equipped with a hot water circulation system. For example: the circulating pump is arranged on the hot water pipe to detect whether water flows or not, if the water flows are detected, the circulating pump is started to circularly heat cold water in the hot water pipe, so that when the circulating pump is used, a water valve is required to be opened and then the circulating pump is closed to start, hot water is circulated after waiting for a period of time, and although the circulating pump and the gas water heater are not required to be started frequently, the hot water can be discharged after waiting for a period of time. Or, setting the backwater temperature, and automatically starting the circulating pump when the backwater temperature is detected to be lower than the set value; or, set for circulation time, start the circulating pump automatically according to circulation time presumed, adopt these two modes, can use the hot water at any time, but circulating pump, gas water heater need start frequently, can both reduce the life of the water heater, the circulating pump operation can also produce the noise. Therefore, in the prior art, in order to realize the circulation heating of the cold water in the hot water pipe, a circulating pump is needed, but the use cost of a user can be increased by installing the circulating pump, and the experience of the user can be reduced by noise generated by the circulating pump.
Disclosure of Invention
The application provides a circulating pump-free household hot water circulating system and a circulating pump-free household hot water circulating method, which solve the technical problems of high cost and poor user experience in the prior art.
The basic scheme provided by the application is as follows: a circulating pump-free domestic hot water circulation system comprising: a gas water heater; a cold water inlet and a hot water outlet are arranged below the gas water heater; the cold water inlet is connected with a water inlet pipe, the water inlet pipe is connected with a first three-way valve, the first three-way valve is connected with a water supply pipe and a cold water pipe, and the cold water pipe is connected with a water point; the hot water outlet is connected with a water outlet pipe, the water outlet pipe is connected with a second three-way valve, the second three-way valve is connected with a hot water pipe and a water diversion pipe, the hot water pipe is connected with a water point, and the hot water pipe is connected with a water return pipe;
a circulating heat preservation module is connected below the water return pipe and is connected with a water conduit; the circulating heat preservation module is used for heating backwater entering from a backwater pipe to obtain hot water, the circulating heat preservation module is used for pushing the hot water to circulate by utilizing gravity difference, pressure fluctuation of a pipe network and residual kinetic energy of backwater, and the pipe network comprises a water supply pipe, a water inlet pipe, a cold water pipe, a water outlet pipe, a hot water pipe and a backwater pipe.
The working principle and the advantages of the application are as follows: in this scheme, cold water is divided into two ways after getting into first three-way valve from the delivery pipe, and one of them is through inlet tube entering water heater, and another way is through cold water pipe arrival water consumption point. After cold water entering the water heater from the water inlet pipe is heated to be hot water, the hot water enters the second three-way valve from the water outlet pipe and is divided into two paths, wherein one path of hot water passes through the hot water pipe to reach a water point and flows through the water return pipe, and the temperature of the hot water is reduced to be backwater in the process of flowing through the water return pipe and then enters the circulating heat preservation module; the other path directly enters the water diversion pipe and is reserved in the water diversion pipe.
At ordinary times, the pipe network (comprising a water supply pipe, a water inlet pipe, a cold water pipe, a water outlet pipe, a hot water pipe and a water return pipe) is filled with water, cold water is filled in the cold water pipe, hot water is generally filled in the hot water pipe, if the pressure of the water supply pipe is stable, water in the hot water pipe and the water return pipe can circularly flow under the action of gravity difference to form low-temperature backwater, the low-temperature backwater enters the circulation heat preservation module, the low-temperature backwater can be heated by the circulation heat preservation module to form hot water, and the hot water can flow out at any time when water consumption points are ensured. If the water supply pipe pressure increases, cold water flows in the following directions: the water supply pipe, the first three-way valve, the water inlet pipe, the gas water heater, the water outlet pipe, the second three-way valve, the hot water pipe, the water point, the water return pipe and the circulating heat preservation module; the circulating heat preservation module can collect a part of backwater entering from the backwater pipe, store energy (the stored energy is kinetic energy and gravitational potential energy of backwater), and meanwhile, the circulating heat preservation module can heat the backwater entering from the backwater pipe from the other part, and change the backwater into hot water. If the water supply pipe pressure is reduced, the hot water flows in the following direction: the energy stored by the water return is released by the circulation heat preservation module, the water diversion pipe, the second three-way valve, the water outlet pipe, the gas water heater, the water inlet pipe, the first three-way valve and the water supply pipe.
When the water point is used for cooling water, a cooling water valve of the water point is opened, the pressure at the first three-way valve is reduced, the cooling water valve of the water point is closed, the pressure at the first three-way valve is increased, and the hot water circulation is formed. When hot water is used for a water point, if a hot water valve of the water point is opened, the gas water heater is started, and the flow direction of the hot water in the gas water heater is as follows: the water supply pipe, the first three-way valve, the water inlet pipe, the gas water heater, the water outlet pipe, the second three-way valve, the hot water pipe and the water consumption point; meanwhile, the energy stored by the circulating heat-preserving module by utilizing the backwater is released, so that hot water obtained by heating the backwater by the circulating heat-preserving module also flows in the following direction: the circulating heat preservation module, the water diversion pipe, the second three-way valve, the hot water pipe and the water consumption point; subsequently, if the hot water valve of the water point is closed, since the hot water of the hot water pipe has residual kinetic energy, the hot water of the hot water pipe continues to flow in the following direction: the hot water pipe, the water return pipe, the circulating heat preservation module, the water diversion pipe and the hot water pipe form circulation until the residual kinetic energy of the hot water in the hot water pipe is exhausted, so that the impact of the water hammer effect on a pipe network is reduced.
In this scheme, there are three cyclic powers to the hot water cycle: firstly, the height of the water return pipe is relatively high, gravity difference can be formed, after the water return in the water return pipe enters the circulating heat insulation module, part of the water return is heated to become hot water, the kinetic energy and gravitational potential energy of the other part of water return are collected, and the collected part of energy can be used as circulating power, namely one of the energy and the gravitational potential energy; secondly, according to hydrodynamics, pressure fluctuation can occur in the flowing process of pipe networks (comprising a water supply pipe, a water inlet pipe, a cold water pipe, a water outlet pipe, a hot water pipe and a water return pipe), and the pressure fluctuation of the pipe networks can also be used as circulating power, and the second pipe network is a circulating power; finally, the hot water of the hot water pipe has a certain flow speed, and backwater changed from temperature drop in the process of flowing through the backwater pipe also has a certain speed, namely the backwater has partial surplus kinetic energy, and the surplus kinetic energy of backwater can also be used as circulating power. Under the action of gravity difference, pressure fluctuation and residual kinetic energy, the circulation process is as follows: the return water in the water return pipe enters the circulating heat preservation module, hot water in the circulating heat preservation module enters the water diversion pipe, hot water in the water diversion pipe enters the hot water pipe, hot water flows through the hot water pipe to reach a water point (the hot water reaching the water point comprises the hot water obtained by heating the return water by the circulating heat preservation module and the hot water remained in the original water diversion pipe), and the hot water flows through the water return pipe to become return water and enter the circulating heat preservation module again. In this way, the benefits are two: firstly, the circulation of hot water is driven by means of gravity difference, pressure fluctuation and residual kinetic energy, the magnitude of thrust formed by the gravity difference, the pressure fluctuation and the residual kinetic energy is smaller, the speed for driving the hot water to flow is smaller than that of a circulating pump, and the pressure fluctuation and the residual kinetic energy are consumed as circulating power, so that the impact of the flowing process on a water guide pipe, a hot water pipe and a water return pipe is reduced, the noise is reduced, and the experience of a user is improved; secondly, the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push the hot water to circulate, an additional circulating pump is not needed to be installed, additional electric energy is not needed to be consumed, and the use cost of a user is reduced.
In addition, the scheme also overcomes the technical bias for the following reasons: for reducing the noise of the hot water circulation, the power of the circulating pump is reduced to slow down the flow speed of the hot water, but no matter how the power of the circulating pump is reduced, the power of the circulating pump is not lower than the rated lowest power, and the circulating pump generates more or less noise, so that the technical prejudice of 'noise generated by the hot water circulation is unavoidable' exists in the prior art. However, in the scheme, the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push the hot water circulation, the magnitude order of thrust formed by the gravity difference, the pressure fluctuation and the residual kinetic energy is smaller, the flow process of pushing the hot water circulation is slow, the impact of the flow can be reduced, the noise is reduced, and the noise is not generated even under ideal conditions. Therefore, the scheme can realize noiseless hot water circulation, and overcomes the technical prejudice.
The application utilizes gravity difference, pressure fluctuation and residual kinetic energy to push hot water to circulate, can reduce noise and use cost, and overcomes the technical prejudice that the noise generated by hot water circulation is unavoidable.
Further, the circulating heat preservation module comprises a first one-way valve, the flowing direction of the first one-way valve is downward, and the lower end of the first one-way valve is connected with an electric water heater; a second one-way valve is connected above the electric water heater, and the flow direction of the second one-way valve is upward; the upper end of the first one-way valve is connected with a water return pipe, and the upper end of the second one-way valve is connected with a water guide pipe.
The beneficial effects are that: the return water in the return pipe enters the electric water heater through the first one-way valve and is heated in the electric water heater to become hot water, and the return water in the return pipe can enter the electric water heater because the flow direction of the first one-way valve is downward, but the hot water in the electric water heater cannot enter the return pipe; similarly, because the flow direction of the second one-way valve is upward, hot water in the electric water heater can enter the water guide pipe, but hot water reserved in the water guide pipe cannot enter the electric water heater.
If the water supply pipe pressure increases, cold water flows in the following directions: the water supply pipe, the first three-way valve, the water inlet pipe, the gas water heater (cold water becomes hot water), the water outlet pipe, the second three-way valve, the hot water pipe, the water point, the water return pipe (hot water becomes return water), the first one-way valve, the third three-way valve and the electric water heater, wherein the part of cold water return water is heated to become hot water; if the water supply pipe pressure is reduced, the hot water flows in the following direction: electric water heater, second one-way valve, water conduit, second three-way valve, water outlet pipe, gas water heater, water inlet pipe, first three-way valve and water supply pipe, so that the energy stored by the circulating heat-preserving module by utilizing backwater can be released.
When the water point is used for cooling water, a cooling water valve of the water point is opened, the pressure at the first three-way valve is reduced, the cooling water valve of the water point is closed, the pressure at the first three-way valve is increased, and the hot water circulation is formed. When hot water is used for the water point, if the hot water valve of the water point is opened, the gas water heater is started, and the water flow direction is as follows: a water supply pipe (cold water), a first three-way valve, a water inlet pipe, a gas water heater (cold water is changed into hot water), a water outlet pipe, a second three-way valve, a hot water pipe and a water consumption point; meanwhile, the energy stored by the circulating heat preservation module by utilizing backwater is released, so that hot water obtained by heating backwater by the electric water heater also flows in the following direction: electric water heater (hot water), water diversion pipe (hot water), second three-way valve, hot water pipe and water consumption point; subsequently, if the hot water valve of the water point is closed, since the hot water of the hot water pipe has residual kinetic energy, the hot water of the hot water pipe continues to flow in the following direction: the water hammer effect impact on the pipe network is reduced until the residual kinetic energy of the hot water in the hot water pipe is exhausted.
The electric water heater can keep warm the backwater that the temperature that gets into from the wet return reduces, when using hot water with the hot water valve of water point opening, gravity difference, pressure fluctuation and surplus kinetic energy make cyclic process as follows: the water return in the water return pipe enters the electric water heater through the first one-way valve, hot water in the electric water heater enters the water guide pipe, hot water in the water guide pipe enters the hot water pipe, hot water in the hot water pipe reaches a water point, and the hot water flows through the water return pipe to become water return to enter the electric water heater, so that the electric water heater can play a role in circulating heat preservation, frequent starting of the gas water heater is avoided, and the service life of the gas water heater is prolonged; after the water consumption point is used, the residual hot water in the hot water pipe can not flow backwards due to the limiting effect of the second one-way valve, and only flows through the water return pipe and enters the electric water heater after passing through the first one-way valve, so that the 'water hammer effect' caused by the residual hot water backflow is reduced, and the damage effect of hot water backflow impact is lightened.
Further, a third three-way valve is connected between the first one-way valve and the electric water heater, and the third three-way valve is connected with a pressure stabilizing tank.
The beneficial effects are that: if the supply pipe pressure increases, the water flow direction is as follows: the water supply pipe (cold water), the first three-way valve, the water inlet pipe, the gas water heater (cold water becomes hot water), the water outlet pipe, the second three-way valve, the hot water pipe, the water point, the water return pipe (hot water becomes backwater), the first one-way valve, the third three-way valve, the electric water heater and the pressure stabilizing tank, wherein the backwater entering the pressure stabilizing tank is collected, and the air in the pressure stabilizing tank is continuously compressed in the process of the backwater entering the pressure stabilizing tank, so that the pressure of the air in the pressure stabilizing tank rises, which is equivalent to the residual kinetic energy and gravitational potential energy of the backwater to be converted into the elastic potential energy of the air; if the water supply pipe pressure is reduced, the hot water flows in the following direction: the electric water heater (hot water), the second one-way valve, the water diversion pipe (hot water), the second three-way valve, the water outlet pipe, the gas water heater, the water inlet pipe, the first three-way valve and the water supply pipe, so that the pressure stabilizing tank can release the elastic potential energy stored by the backwater.
When hot water is used for the water point, if the hot water valve of the water point is opened, the gas water heater is started, and the water flow direction is as follows: a water supply pipe (cold water), a first three-way valve, a water inlet pipe, a gas water heater (cold water is changed into hot water), a water outlet pipe, a second three-way valve, a hot water pipe and a water consumption point; meanwhile, the elastic potential energy stored by the backwater is released by the pressure stabilizing tank, so that hot water obtained by heating backwater by the electric water heater also flows, and the water flow direction is as follows: electric water heater (hot water), water diversion pipe (hot water), second three-way valve, hot water pipe and water consumption point; subsequently, if the hot water valve of the water point is closed, since the hot water of the hot water pipe has residual kinetic energy, the hot water of the hot water pipe continues to flow in the following direction: the water hammer effect impact on the pipe network is reduced until the residual kinetic energy of the hot water in the hot water pipe is exhausted.
Therefore, when backwater in the backwater pipe enters the electric water heater through the first one-way valve, backwater also enters the pressure stabilizing tank through the third three-way valve, so that the pressure stabilizing tank stores water gradually, and the pressure of air in the pressure stabilizing tank is also increased continuously; when water begins to be used at a water consumption point, backwater in the pressure stabilizing tank can enter the electric water heater through the third three-way valve, the energy stored in the pressure stabilizing tank is gradually released, and the pressure of air in the pressure stabilizing tank pushes hot water in the electric water heater to enter the water guide pipe; the surge tank plays a role in storing energy and distributing flow, reduces the impact effect when cold water enters the electric water heater, prolongs the service life, and reduces noise, thereby improving the experience of users.
Further, the water return pipe comprises a horizontal section and a vertical section, the horizontal section is provided with a gradient, and an automatic exhaust valve is arranged at the high position of the horizontal section.
The beneficial effects are that: the solubility of gas in liquid is inversely proportional to the temperature, the higher the temperature of the liquid is, the more intense the thermal motion of gas molecules dissolved in the liquid is, the gas molecules are easier to escape from the liquid, the temperature of the hot water is reduced in the process of forming backwater through a water return pipe, air dissolved in the hot water is gradually escaped to form bubbles and gradually accumulated to form air resistance, the flowing speed is influenced, the gradient is set at the horizontal section, the bubbles are favorably gathered at the high position of the horizontal section, the bubbles are conveniently discharged through an automatic exhaust valve arranged at the high position of the horizontal section, the influence of the air resistance on the flowing speed is reduced, and the rapid backwater is favorably realized.
Further, the water supply pipe is connected with a main valve.
The beneficial effects are that: the on-off of the cold water of the water supply pipe and the flow of the cold water can be controlled by adjusting the main valve.
Further, the hot water pipe is coated with an insulation layer.
The beneficial effects are that: the heat loss of the hot water can be reduced, the temperature of the hot water is prevented from being reduced in the flowing process of the hot water pipe, the experience of a user can be improved, and the electricity consumption of the electric water heater can be saved.
Further, the electric water heater keeps warm according to the set temperature.
The beneficial effects are that: the user can confirm the settlement temperature according to actual need for the temperature of the hot water that comes out with the water spot is the same or close with self suitable temperature, improves user's experience sense.
Based on the above disclosed circulating pump-free household hot water circulating system, the application also provides a circulating pump-free household hot water circulating method, comprising the following steps:
s1, hot water in the gas water heater enters a second three-way valve from a water outlet pipe to be split into two paths, wherein one path of hot water reaches a water point through a hot water pipe, and the other path of hot water enters a water diversion pipe;
s2, the temperature of the hot water flowing through the water return pipe is reduced to be changed into backwater, the backwater enters the circulating heat preservation module, and the backwater is subjected to heat preservation by the circulating heat preservation module to be changed into hot water;
s3, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulating heat preservation module enters a water diversion pipe, and the hot water in the water diversion pipe enters a hot water pipe and flows into the hot water pipe to reach a water consumption point;
s4, enabling the hot water reaching the water point to flow through the water return pipe to be changed into return water and enter the circulating heat preservation module.
The working principle and the advantages of the application are as follows: the circulation of hot water is driven by gravity difference, pressure fluctuation and residual kinetic energy, the thrust formed by the gravity difference, the pressure fluctuation and the residual kinetic energy is smaller in order of magnitude, and the speed of the flow driving process is smaller than that of the circulating pump, so that the impact of hot water flow on a water guide pipe, a hot water pipe and a water return pipe is reduced, the generation of noise is reduced, and the experience of a user is improved; the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push the hot water to circulate, an additional circulating pump is not needed to be installed, and additional electric energy is not needed to be consumed, so that the use cost of a user is reduced.
Further, in S2, the hot water flows through the return pipe temperature decline and becomes return water and get into circulation heat preservation module, and the return water receives circulation heat preservation module heat preservation to become hot water, includes: the backwater flows through the first one-way valve and enters the electric water heater, and is heated in the electric water heater to become hot water;
in S3, under the effect of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulation heat preservation module enters the water diversion pipe, hot water in the water diversion pipe enters the hot water pipe and flows through the hot water pipe to reach a water consumption point, and the system comprises: under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the electric water heater enters a water diversion pipe, hot water in the water diversion pipe enters a hot water pipe, and the hot water in the hot water pipe reaches a water consumption point;
in S4, the hot water that reaches the water point flows through the return pipe and becomes return water and get into circulation heat preservation module, includes: the hot water reaching the water consumption point is changed into backwater through the backwater pipe, and the backwater flows through the first one-way valve to enter the electric water heater.
The beneficial effects are that: when hot water is needed, the electric water heater can play a role in circulating heat preservation, frequent starting of the gas water heater is avoided, and the service life of the gas water heater is prolonged; after the use is finished, the residual hot water can not flow backwards due to the limiting effect of the second one-way valve, and only flows through the water return pipe and the first one-way valve to enter the electric water heater, so that the 'water hammer effect' caused by the backflow of the residual hot water is reduced, and the damage effect of the backflow impact of the hot water is lightened.
Further, in S2, further includes: and backwater enters the pressure stabilizing tank through a third three-way valve.
The beneficial effects are that: the return water enters the surge tank to enable the surge tank to store water gradually, the return water can continuously compress air in the surge tank, so that the pressure of the air in the surge tank rises, the residual kinetic energy and gravitational potential energy equivalent to the return water are converted into elastic potential energy of the air, when water consumption begins at a water consumption point, the elastic potential energy stored in the surge tank is released gradually, the surge tank plays roles of storing energy, shunting and throttling, the impact effect of the return water entering the electric water heater is reduced, the service life is prolonged, noise is reduced, and the experience of a user is improved.
Drawings
FIG. 1 is a block diagram showing the construction of a system according to example 1 of the circulating pump-free domestic hot water circulating system of the present application.
FIG. 2 is a block diagram showing the construction of a system according to an embodiment 1 of the circulating heat-preserving module of the circulating pump-free domestic hot water circulating system of the present application
FIG. 3 is a flow chart of example 1 of the circulating pump-free domestic hot water circulating method of the present application.
Detailed Description
The following is a further detailed description of the embodiments:
the labels in the drawings of this specification include: the gas water heater 1, the water inlet pipe 2, the first three-way valve 3, the water supply pipe 4, the cold water pipe 5, the water outlet pipe 6, the second three-way valve 7, the hot water pipe 8, the water conduit 9, the water return pipe 10, the circulation heat preservation module 11, the water point 12, the first one-way valve 13, the electric water heater 14, the second one-way valve 15, the third three-way valve 16, the surge tank 17, the automatic exhaust valve 18 and the main valve 19.
Example 1
An embodiment is substantially as shown in fig. 1, comprising: a gas water heater 1; a cold water inlet and a hot water outlet are arranged below the gas water heater 1; the cold water inlet is connected with a water inlet pipe 2, the water inlet pipe 2 is connected with a first three-way valve 3, the first three-way valve 3 is connected with a water supply pipe 4 and a cold water pipe 5, and the cold water pipe 5 is connected with a water consumption point 12 (a cross fork in the figure 1); the water usage points 12 include kitchens, toilets, etc., each water usage point 12 having two water taps, one for discharging hot water (hot water valve) and the other for discharging cold water (cold water valve). The water supply pipe 4 is connected with a main valve 19, and the on-off of cold water and the flow of the cold water of the water supply pipe 4 can be controlled by adjusting the main valve 19; the hot water outlet is connected with a water outlet pipe 6, the water outlet pipe 6 is connected with a second three-way valve 7, the second three-way valve 7 is connected with a hot water pipe 8 and a water conduit 9, the hot water pipe 8 is connected with a water point 12, and the hot water pipe 8 is connected with a water return pipe 10; the heat preservation layer is coated on the hot water pipe 8, the heat loss of the hot water can be reduced by the heat preservation layer, the temperature of the hot water is prevented from being reduced in the flowing process of the hot water pipe 8, the experience of a user can be improved, and the electricity consumption of the electric water heater 14 can be saved.
A circulating heat preservation module 11 is connected below the water return pipe 10, and the circulating heat preservation module 11 is connected with the water conduit 9; the circulation heat preservation module 11 is used for heating backwater entering from the backwater pipe 10 to obtain hot water, the circulation heat preservation module 11 is used for pushing the hot water to circulate by utilizing gravity difference, pressure fluctuation of a pipe network and residual kinetic energy of backwater, the hot water obtained by heating is pushed to enter the water diversion pipe 9, and the pipe network comprises a water supply pipe 4, a water inlet pipe 2, a cold water pipe 5, a water outlet pipe 6, a hot water pipe 8 and the backwater pipe 10.
In this embodiment, as shown in fig. 2, the circulation heat insulation module 11 includes a first check valve 13, a flow direction of the first check valve 13 is downward, an electric water heater 14 is connected to a lower end of the first check valve 13, and the electric water heater 14 adopts a volumetric type; the electric water heater 14 keeps the temperature according to the preset temperature of the user, so that the temperature of the hot water from the water point 12 is the same as or similar to the temperature suitable for the user, and the experience of the user is improved; a second one-way valve 15 is connected above the electric water heater 14, and the flow direction of the second one-way valve 15 is upward; the upper end of the first one-way valve 13 is connected with the water return pipe 10, and the upper end of the second one-way valve 15 is connected with the water guide pipe 9. A third three-way valve 16 is connected between the first one-way valve 13 and the electric water heater 14, and the third three-way valve 16 is connected with a surge tank 17.
At ordinary times, the pipe network is full of water, cold water is filled in the cold water pipe 5, hot water is generally filled in the hot water pipe 8, if the pressure of the water supply pipe 4 is stable, the height of the water return pipe 10 is relatively high, water in the hot water pipe 8 and the water return pipe 10 can circularly flow under the action of gravity difference to form low-temperature backwater, the backwater enters the circulation heat preservation module 11, the low-temperature backwater can be heated by the circulation heat preservation module 11 to form hot water, and the hot water can flow out at any time when the water consumption point 12 is ensured.
If the pressure of the water supply pipe 4 increases, cold water flows in the following direction: the water supply pipe 4- & gt the first three-way valve 3- & gt the water inlet pipe 2- & gt the gas water heater 1 (cold water becomes hot water) & gt the water outlet pipe 6- & gt the second three-way valve 7- & gt the hot water pipe 8- & gt the water consumption point 12- & gt the water return pipe 10 (hot water becomes backwater) & gt the first one-way valve 13- & gt the third three-way valve 16- & gt the electric water heater 14 and the surge tank 17, wherein the part of cold water backwater entering the electric water heater 14 is heated to become hot water, the part of backwater entering the surge tank 17 is collected, and the air in the surge tank 17 is continuously compressed in the process of backwater entering the surge tank 17, so that the pressure of the air in the surge tank 17 rises, the surplus kinetic energy and gravitational potential energy equivalent to backwater are converted into elastic potential energy of the air, and the surplus kinetic energy and gravitational potential energy of backwater are converted into elastic potential energy and are stored by the surge tank 17; if the pressure of the water supply pipe 4 is reduced, the hot water flows in the following direction: 14 of the electric water heater, 15 of the second one-way valve, 9 of the water diversion pipe, 7 of the second three-way valve, 6 of the water outlet pipe, 1 of the gas water heater, 2 of the water inlet pipe, 3 of the first three-way valve, 4 of the water supply pipe, and the energy stored by the pressure stabilizing tank 17 by utilizing backwater is released.
When the water point 12 is used for cooling water, the cooling water valve of the water point 12 is opened, the pressure at the first three-way valve 3 is reduced, the cooling water valve of the water point 12 is closed, the pressure at the first three-way valve 3 is increased, and the hot water circulation is formed. When the water point 12 is used for heating water, if the hot water valve of the water point 12 is opened, the gas water heater 1 is started, and the water flow direction is as follows: a water supply pipe 4 (cold water), a first three-way valve 3, a water inlet pipe 2, a gas water heater 1 (cold water is changed into hot water), a water outlet pipe 6, a second three-way valve 7, a hot water pipe 8 and a water consumption point 12; meanwhile, the energy stored in the surge tank 17 by the backwater is released, so that the hot water obtained by heating the backwater by the electric water heater 14 also flows in the following direction: electric water heater 14 (hot water), water conduit 9 (hot water), second three-way valve 7, hot water pipe 8, water consumption point 12; subsequently, if the hot water valve of the water spot 12 is closed, since the hot water of the hot water pipe 8 has residual kinetic energy, the hot water of the hot water pipe 8 continues to flow in the following direction: the circulation is formed by the hot water pipe 8 (hot water), the return water pipe 10 (return water is changed into return water), the electric water heater 14 (return water is changed into hot water), the water guide pipe 9 and the hot water pipe 8 until the residual kinetic energy of the hot water in the hot water pipe 8 is exhausted.
The specific implementation process is as follows:
the cold water can be divided into two paths after entering the first three-way valve 3 from the water supply pipe 4, wherein one path enters the water heater through the water inlet pipe 2, and the other path can reach the water consumption point 12 through the cold water pipe 5. After cold water entering the water heater from the water inlet pipe 2 is heated to be hot water, the hot water enters the second three-way valve 7 from the water outlet pipe 6 and is divided into two paths, wherein one path of hot water passes through the hot water pipe 8 to reach a water point 12 and flows through the water return pipe 10, and the temperature of the hot water is reduced to be returned water in the process of flowing through the water return pipe 10 and then enters the circulating heat preservation module 11; the other path directly enters the water conduit 9 and is reserved in the water conduit 9.
In this scheme, there are three cyclic powers to the hot water cycle: firstly, if the pressure of the water supply pipe 4 is stable, water in the hot water pipe 8 and the water return pipe 10 circularly flows under the action of gravity difference to form backwater with low temperature and enters the circulation heat preservation module 11, on the other hand, after backwater in the backwater pipe 10 enters the circulation heat preservation module 11, part of backwater is heated to become hot water, the rest kinetic energy and gravitational potential energy of the other backwater are collected and converted into elastic potential energy, and the elastic potential energy can also be used as circulation power; secondly, according to fluid mechanics, pressure fluctuation can occur in the flowing process of pipe networks (comprising a water supply pipe 4, a water inlet pipe 2, a cold water pipe 5, a water outlet pipe 6, a hot water pipe 8 and a water return pipe 10), and the pressure fluctuation of the pipe networks can also be used as circulating power, and the second pipe network is a circulating power; finally, the hot water of the hot water pipe 8 has a certain flow speed, and the backwater changed by the temperature drop in the process of flowing through the backwater pipe 10 also has a certain speed, namely the surplus kinetic energy of the backwater exists in part, and the surplus kinetic energy of the backwater can also be used as circulating power. Under the action of gravity difference, pressure fluctuation and residual kinetic energy, the circulation process is as follows: the backwater in the backwater pipe 10 enters the circulation heat preservation module 11, the hot water in the circulation heat preservation module 11 enters the water diversion pipe 9, the hot water in the water diversion pipe 9 enters the hot water pipe 8, the hot water flows through the hot water pipe 8 to reach the water point 12 (the hot water reaching the water point 12 comprises the hot water obtained by heating the backwater by the circulation heat preservation module 11 and the hot water remained in the original water diversion pipe 9), and the hot water flows through the backwater pipe 10 to become backwater and then enters the circulation heat preservation module 11 again. In this way, the benefits are two: firstly, the circulation of hot water is pushed by means of gravity difference, pressure fluctuation and residual kinetic energy, the magnitude of thrust formed by the gravity difference, the pressure fluctuation and the residual kinetic energy is smaller, the speed for pushing the hot water to flow is smaller than that of a circulating pump, and the pressure fluctuation and the residual kinetic energy are consumed as circulating power, so that the impact of the flowing process on a water conduit 9, a hot water pipe 8 and a return pipe 10 is reduced, the generation of noise is reduced, and the experience of a user is improved; secondly, the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push the hot water to circulate, an additional circulating pump is not needed to be installed, additional electric energy is not needed to be consumed, and the use cost of a user is reduced.
In this embodiment, the working principle of the circulation heat preservation module 11 is described in detail as follows: the backwater in the backwater pipe 10 enters the electric water heater 14 through the first one-way valve 13 and is heated in the electric water heater 14 to become hot water, and the cold water in the backwater pipe 10 can enter the electric water heater 14 due to the downward flow direction of the first one-way valve 13, but the hot water in the electric water heater 14 cannot enter the backwater pipe 10; similarly, because the flow direction of the second check valve 15 is upward, hot water in the electric water heater 14 can enter the water conduit 9, but hot water remaining in the water conduit 9 cannot enter the electric water heater 14. The electric water heater 14 can keep warm and heat the backwater with reduced temperature entering from the backwater pipe 10, and when hot water is used by the water point 12, the circulation process is as follows due to gravity difference, pressure fluctuation and residual kinetic energy: the circulating heat preservation module 11 achieves heat preservation of hot water circulation, frequent starting of the gas water heater 1 is avoided, and the service life of the gas water heater 1 is prolonged; after the water consumption point 12 is used, the residual hot water in the hot water pipe 8 can not flow backwards due to the limiting effect of the second one-way valve 15, and only flows through the water return pipe 10 and enters the electric water heater 14 after passing through the first one-way valve 13, so that the 'water hammer effect' caused by the residual hot water backflow is reduced, and the damage effect of hot water backflow impact is lightened.
Meanwhile, when the backwater in the backwater pipe 10 enters the electric water heater 14 through the first one-way valve 13, the backwater also enters the surge tank 17 through the third three-way valve 16, so that the surge tank 17 gradually stores water, the backwater continuously compresses the air in the surge tank 17 in the process of entering the surge tank 17, the pressure of the air in the surge tank 17 rises, the residual kinetic energy and gravitational potential energy of the backwater are converted into the elastic potential energy of the air, the surge tank 17 plays a role in storing energy and shunting, the impact effect when the backwater enters the electric water heater 14 is reduced, the service life is prolonged, and the noise is also reduced; when the water consumption point 12 starts to consume water, backwater in the surge tank 17 can enter the electric water heater 14 through the third three-way valve 16, energy stored in the surge tank 17 can be gradually released, and the pressure of air in the surge tank 17 and the pressure of backwater in the backwater pipe 10 push hot water in the electric water heater 14 to enter the water guide pipe 9 together, so that the energy stored in the surge tank 17 is consumed.
Therefore, the technical bias is overcome by the scheme, and the reason is as follows: for reducing the noise of the hot water circulation, the power of the circulating pump is reduced to slow down the flow speed of the hot water, but no matter how the power of the circulating pump is reduced, the power of the circulating pump is not lower than the rated lowest power, and the circulating pump generates more or less noise, so that the technical prejudice of 'noise generated by the hot water circulation is unavoidable' exists in the prior art. However, in the scheme, the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push the hot water to circulate, the formed thrust order is smaller, the hot water is pushed to flow slowly, the impact of the hot water flow can be reduced, the noise is reduced, and the noise is not generated even in ideal cases. Therefore, the scheme can realize noiseless hot water circulation, and overcomes the technical prejudice.
Based on the above-mentioned domestic hot water circulation system without circulation pump, this embodiment also discloses a domestic hot water circulation method without circulation pump, as shown in fig. 3, the steps are as follows:
s1, hot water in the gas water heater 1 enters a second three-way valve 7 from a water outlet pipe 6 to be split into two paths, one path of hot water reaches a water point 12 through a hot water pipe 8, and the other path of hot water enters a water diversion pipe 9;
s2, the temperature of the hot water flowing through the water return pipe 10 is reduced to be changed into backwater, the backwater enters the circulation heat preservation module 11, the backwater is subjected to heat preservation by the circulation heat preservation module 11 to be changed into hot water, namely, the backwater enters the electric water heater 14 through the first one-way valve 13, the electric water heater 14 is heated to be changed into hot water, and meanwhile, the backwater enters the pressure stabilizing tank 17 through the third three-way valve 16;
s3, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulation heat preservation module 11 enters the water guide pipe 9, hot water in the water guide pipe 9 enters the hot water pipe 8 and flows through the hot water pipe 8 to reach a water use point 12, namely, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the electric water heater 14 enters the water guide pipe 9, hot water in the water guide pipe 9 enters the hot water pipe 8, and hot water in the hot water pipe 8 reaches the water use point 12;
and S4, the hot water reaching the water point 12 flows through the water return pipe 10 and enters the circulation heat preservation module 11, namely, the temperature of the hot water reaching the water point 12 drops to be changed into return water through the water return pipe 10, and the return water flows through the first one-way valve 13 and enters the electric water heater 14.
Therefore, when the hot water is needed to be used, the electric water heater 14 can play a role in circulating heat preservation, after the use is finished, the residual hot water cannot flow backwards due to the limiting effect of the second one-way valve 15, so that the 'water hammer effect' caused by the residual hot water backflow is reduced, and the damage effect of the hot water backflow impact is lightened; the backwater enters the surge tank 17 to store energy, split and throttle, so that the impact of backwater entering the electric water heater 14 is reduced; when the water consumption point 12 starts to consume water, the pressure of the return water in the surge tank 17 and the pressure of the return water in the return water pipe 10 push the hot water in the electric water heater 14 to enter the water conduit 9, and the energy stored in the surge tank 17 is gradually consumed. Therefore, the circulation of the hot water is driven by gravity difference, pressure fluctuation and residual kinetic energy, so that the noise is reduced, the experience of a user is improved, an additional circulating pump is not required to be installed, additional electric energy is not required to be consumed, and the use cost is reduced.
Example 2
The only difference from embodiment 1 is that the return pipe 10 includes a horizontal section provided with a slope and a vertical section provided with an automatic exhaust valve 18 at the height of the horizontal section. Because the solubility of gas in liquid is inversely proportional to the temperature, the higher the temperature of the liquid is, the more intense the thermal motion of gas molecules dissolved in the liquid is, the gas molecules are easier to escape from the liquid, the temperature of hot water flowing through the water return pipe 10 is reduced to become backwater, air in the dissolved backwater is gradually escaped to form bubbles and gradually accumulated to form air resistance, the flowing speed is influenced, the horizontal section is provided with a gradient, the bubbles are favorably gathered at the high position of the horizontal section, the air bubbles are conveniently discharged by the automatic exhaust valve 18 arranged at the high position of the horizontal section, the influence of the air resistance on the flowing speed is reduced, and the rapid backwater is favorably realized.
The foregoing is merely an embodiment of the present application, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. A circulating pump-free domestic hot water circulation system comprising: a gas water heater; a cold water inlet and a hot water outlet are arranged below the gas water heater; the cold water inlet is connected with a water inlet pipe, the water inlet pipe is connected with a first three-way valve, the first three-way valve is connected with a water supply pipe and a cold water pipe, and the cold water pipe is connected with a water point; the hot water outlet is connected with a water outlet pipe, the water outlet pipe is connected with a second three-way valve, the second three-way valve is connected with a hot water pipe and a water diversion pipe, the hot water pipe is connected with a water point, and the hot water pipe is connected with a water return pipe;
the water return pipe is characterized in that a circulating heat preservation module is connected below the water return pipe, and the circulating heat preservation module is connected with a water guide pipe; the circulating heat preservation module is used for heating backwater entering from a backwater pipe to obtain hot water, and is used for pushing the hot water to circulate by utilizing gravity difference, pressure fluctuation of a pipe network and residual kinetic energy of the backwater, wherein the pipe network comprises a water supply pipe, a water inlet pipe, a cold water pipe, a water outlet pipe, a hot water pipe and a backwater pipe;
the circulating heat preservation module comprises a first one-way valve, the flowing direction of the first one-way valve is downward, and the lower end of the first one-way valve is connected with an electric water heater; a second one-way valve is connected above the electric water heater, and the flow direction of the second one-way valve is upward; the upper end of the first one-way valve is connected with a water return pipe, and the upper end of the second one-way valve is connected with a water guide pipe;
the gravity difference, pressure fluctuation and residual kinetic energy make the circulation process as follows: the return water in the return water pipe enters the electric water heater through the first one-way valve, hot water in the electric water heater enters the water diversion pipe, hot water in the water diversion pipe enters the hot water pipe, hot water in the hot water pipe reaches a water point, and the hot water flows through the return water pipe to become return water to enter the electric water heater;
a third three-way valve is connected between the first one-way valve and the electric water heater, and the third three-way valve is connected with a pressure stabilizing tank.
2. The circulating pump-free domestic hot water circulation system of claim 1, wherein the return pipe comprises a horizontal section and a vertical section, the horizontal section is provided with a gradient, and an automatic exhaust valve is arranged at the height of the horizontal section.
3. The pumpless domestic hot water circulation system of claim 2, wherein the water supply line is connected to a main valve.
4. A pumpless domestic hot water circulation system as claimed in claim 3, wherein said hot water pipe is clad with a heat insulating layer.
5. The circulating pump-free domestic hot water circulating system of claim 4, wherein the electric water heater is insulated according to a set temperature.
6. A method for circulating domestic hot water without a circulating pump, which is realized based on the domestic hot water circulating system without a circulating pump according to any one of claims 1-5 and comprises the following steps:
s1, hot water in the gas water heater enters a second three-way valve from a water outlet pipe to be split into two paths, wherein one path of hot water reaches a water point through a hot water pipe, and the other path of hot water enters a water diversion pipe;
s2, the temperature of the hot water flowing through the water return pipe is reduced to be changed into backwater, the backwater enters the circulating heat preservation module, and the backwater is subjected to heat preservation by the circulating heat preservation module to be changed into hot water;
s3, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulating heat preservation module enters a water diversion pipe, and the hot water in the water diversion pipe enters a hot water pipe and flows into the hot water pipe to reach a water consumption point;
s4, enabling the hot water reaching the water point to flow through a return pipe to be changed into return water and enter the circulating heat-preserving module;
in S2, the hot water flows through the return pipe temperature decline and becomes return water and get into circulation heat preservation module, and the return water receives circulation heat preservation module heat preservation to become hot water, includes: the backwater flows through the first one-way valve and enters the electric water heater, and is heated in the electric water heater to become hot water;
in S3, under the effect of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulation heat preservation module enters the water diversion pipe, hot water in the water diversion pipe enters the hot water pipe and flows through the hot water pipe to reach a water consumption point, and the system comprises: under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the electric water heater enters a water diversion pipe, hot water in the water diversion pipe enters a hot water pipe, and the hot water in the hot water pipe reaches a water consumption point;
the gravity difference, pressure fluctuation and residual kinetic energy make the circulation process as follows: the return water in the return water pipe enters the electric water heater through the first one-way valve, hot water in the electric water heater enters the water diversion pipe, hot water in the water diversion pipe enters the hot water pipe, hot water in the hot water pipe reaches a water point, and the hot water flows through the return water pipe to become return water to enter the electric water heater;
in S4, the hot water that reaches the water point flows through the return pipe and becomes return water and get into circulation heat preservation module, includes: the hot water reaching the water consumption point flows through a water return pipe to become backwater, and the backwater flows through a first one-way valve to enter the electric water heater;
s2, further comprising: and backwater enters the pressure stabilizing tank through a third three-way valve.
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| JP2003287279A (en) * | 2002-03-28 | 2003-10-10 | Kyuhen Co Ltd | Hot-water supply cogeneration device |
| CN201517815U (en) * | 2009-09-18 | 2010-06-30 | 上海岭北冷暖设备工程有限公司 | Supercharged hot-water circulating device of automatic switchover water heater |
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