CN114198900A - Circulating pump-free household hot water circulating system and method - Google Patents
Circulating pump-free household hot water circulating system and method Download PDFInfo
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- CN114198900A CN114198900A CN202111536615.2A CN202111536615A CN114198900A CN 114198900 A CN114198900 A CN 114198900A CN 202111536615 A CN202111536615 A CN 202111536615A CN 114198900 A CN114198900 A CN 114198900A
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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 invention relates to the technical field of hot water circulation, in particular to a household hot water circulation system without a circulating pump and a method thereof, wherein the system comprises: 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 consumption point, and the hot water pipe is connected with a water return pipe; a circulating heat-insulating module is connected below the water return pipe and is connected with a water diversion pipe; 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 invention solves the technical problems of high cost and poor user experience in the prior art.
Description
Technical Field
The invention relates to the technical field of hot water circulation, in particular to a circulating pump-free household hot water circulation system and a method.
Background
At present, almost every family of urban residents is provided with a gas water heater, so that hot water can be conveniently used. In general, gas water heaters are installed in kitchens, water consumption points include kitchens, toilets and laundry sinks, and the distance between the water consumption points and the gas water heaters may be long, for example: the toilet may be located in a bedroom, the laundry groove may be located on a balcony, a hot water pipeline connecting the gas water heater and a water consumption point is also longer, and when hot water is used each time, the gas water heater needs to wait for a period of time and can only discharge hot water after certain cold water is discharged.
In view of this, most homes are equipped with hot water circulation systems. For example: the hot water pipe is provided with the circulating pump, whether water flow exists is detected, if water flow is detected, the circulating pump is started, cold water in the hot water pipe is heated in a circulating mode, the water valve needs to be opened and then turned off to start the circulating pump when the hot water pipe is used, hot water can circulate after waiting for a period of time, and although the circulating pump and the gas water heater do not need to be started frequently, hot water can be discharged after waiting for a period of time. Or, setting the return water temperature, and automatically starting the circulating pump when the detected return water temperature is lower than the set value; or, the circulation time is set, and the circulation pump is automatically started according to the set circulation time, and hot water can be used at any time by adopting the two modes, but the circulation pump and the gas water heater need to be frequently started, so that the service life of the water heater is shortened, and the running of the circulation pump also generates noise. Therefore, in the prior art, in order to realize the circulating heating of the cold water in the hot water pipe, a circulating pump is required, but the installation of the circulating pump increases the use cost of users, and the noise generated by the circulating pump also reduces the experience of the users.
Disclosure of Invention
The invention provides a circulating pump-free household hot water circulating system and a circulating pump-free household hot water circulating method, and solves the technical problems of high cost and poor user experience in the prior art.
The basic scheme provided by the invention 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 consumption 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 consumption point, and the hot water pipe is connected with a water return pipe;
a circulating heat-insulating module is connected below the water return pipe and is connected with a water diversion pipe; the circulating heat-preserving module is used for heating backwater entering from the backwater pipe to obtain hot water, and the circulating heat-preserving module is used for pushing hot water circulation by utilizing gravity difference, pressure fluctuation of a pipe network and residual kinetic energy of the 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 invention are as follows: in the scheme, cold water enters the first three-way valve from the water supply pipe and then is divided into two paths, wherein one path enters the water heater through the water inlet pipe, and the other path reaches a water using point through the cold water pipe. After cold water entering the water heater from the water inlet pipe is heated into 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 reaches a water using point through the hot water pipe and flows through the water return pipe, and the hot water enters the circulating heat preservation module after the temperature of the hot water is reduced to return water in the process of flowing through the water return pipe; the other path directly enters the water conduit and is reserved in the water conduit.
At ordinary times, the pipe network (including delivery pipe, inlet tube, cold water pipe, outlet pipe, hot-water line and wet return) is full of water, is cold water in the cold water pipe, is hot water in the hot-water line generally, if delivery pipe pressure is stable, the water in hot-water line, wet return can circulate under the poor effect of gravity and flow and form the return water that the temperature is low to get into circulation heat preservation module, the return water that the temperature is low can be heated by circulation heat preservation module and form hot water, guarantees that the hot water flows out at any time. If the pressure in the water supply pipe increases, the cold water flows in the following directions: water supply pipe → first three-way valve → water inlet pipe → gas water heater → water outlet pipe → second three-way valve → hot water pipe → water spot → return pipe → circulating heat preservation module; the circulating heat-preserving module can collect one part of backwater entering from the backwater pipe, store energy (the stored energy is kinetic energy and gravitational potential energy of the backwater), and meanwhile, the circulating heat-preserving module can heat the other part of backwater entering from the backwater pipe to change the backwater into hot water. If the supply pipe pressure is reduced, the hot water will flow in the following direction: the circulating 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 → the water supply pipe, so that the energy stored by the backwater is released by the circulating heat preservation module.
When cold water is used at the water using point, the cold water valve at the water using point is opened, the pressure at the first three-way valve is reduced, the cold water valve at the water using point is closed, the pressure at the first three-way valve is increased, and hot water circulation can be formed. When hot water is used at a water consumption point, if a hot water valve of the water consumption point is opened, the gas water heater is started, and the flowing direction of the hot water in the gas water heater is as follows: water supply pipe → first three-way valve → water inlet pipe → gas water heater → water outlet pipe → second three-way valve → hot water pipe → water consumption point; meanwhile, the energy stored by the backwater is released by the circulating heat preservation module, so that the hot water obtained by heating the backwater by the circulating heat preservation module flows in the following flowing direction: the circulating heat preservation module → the water diversion pipe → the second three-way valve → the hot water pipe → the water using point; subsequently, if the hot water valve of the water consumption point is closed, the hot water of the hot water pipe continues to flow due to the residual kinetic energy of the hot water pipe, and the flow direction is as follows: the hot water pipe → the water return pipe → the circulating heat preservation module → the water diversion pipe → the hot water pipe, and a circulation is formed until the residual kinetic energy of the hot water in the hot water pipe is exhausted, so that the impact influence of the water hammer effect on the pipe network is reduced.
In the scheme, three cycles of power exist in the hot water circulation: firstly, the height of the water return pipe is relatively high, so that gravity difference can be formed, after return water in the water return pipe enters the circulating heat-preserving module, one part of the return water is heated to be changed into hot water, the kinetic energy and the gravitational potential energy of the other part of the return water are collected, and the collected part of the energy can also be used as circulating power; secondly, according to hydrodynamics, pressure fluctuation occurs in the flowing process of a 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), and the pressure fluctuation of the pipe network can also be used as circulating power; and finally, the hot water in the hot water pipe has a certain flowing speed, the return water which is changed by temperature reduction in the process of flowing through the return water pipe also has a certain speed, namely, the residual kinetic energy of the return water exists, and the residual kinetic energy of the return water can also be used as circulating power. Under the action of three powers of gravity difference, pressure fluctuation and residual kinetic energy, the circulation process is as follows: the backwater in the backwater pipe enters the circulating heat preservation module → the hot water in the circulating heat preservation module enters the water guide pipe → the hot water in the water guide pipe enters the hot water pipe → the hot water flows through the hot water pipe to reach the water consumption point (the hot water reaching the water consumption point comprises the hot water obtained by heating the backwater by the circulating heat preservation module and the hot water remained in the original water guide pipe) → the hot water flows through the backwater pipe to become backwater and then enters the circulating heat preservation module again. In this way, the benefits are two: firstly, the circulation of hot water is pushed by the difference of gravity, pressure fluctuation and residual kinetic energy, the magnitude order of thrust formed by the three is smaller, the speed for pushing the hot water to flow is smaller compared with that of a circulating pump, and the pressure fluctuation and the residual kinetic energy are consumed as the circulating power, so that the impact of the flowing process on a water conduit, 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; secondly, the gravity difference, the pressure fluctuation and the residual kinetic energy are utilized to push 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 prejudice for the following reasons: for reducing the noise of the hot water circulation, the power of the circulating pump is generally reduced to slow down the flowing 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 minimum power, and the circulating pump generates more or less noise, so that for the prior art, the technical prejudice that the generation of the noise of the hot water circulation is unavoidable exists. However, in the scheme, the hot water circulation is pushed by utilizing the gravity difference, the pressure fluctuation and the residual kinetic energy, the magnitude order of thrust formed by the gravity difference, the pressure fluctuation and the residual kinetic energy is smaller, the flowing process for pushing the hot water circulation is very slow, the flowing impact can be reduced, the noise generation is reduced, and ideally, the noise is not generated. Therefore, the scheme can realize noiseless hot water circulation and overcome the technical bias.
The invention 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 bias that the noise generated by hot water circulation is inevitable.
Furthermore, the circulating heat-preserving module comprises a first one-way valve, the flow 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 the water return pipe, and the upper end of the second one-way valve is connected with the water diversion pipe.
Has the advantages 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 but the hot water in the electric water heater cannot enter the return pipe because the flow direction of the first one-way valve is downward; similarly, because the flow direction of the second one-way valve is upward, hot water in the electric water heater can enter the water conduit, but the hot water remained in the water conduit cannot enter the electric water heater.
If the pressure in the water supply pipe increases, the cold water flows in the following directions: water supply pipe → first three-way valve → water inlet pipe → gas water heater (cold water becomes hot water) → water outlet pipe → second three-way valve → hot water pipe → water use point → water return pipe (hot water becomes return water) → first one-way valve → third three-way valve → electric water heater, this part of cold water return water is heated and becomes hot water; if the supply pipe pressure is reduced, the hot water will flow in the following direction: the electric water heater → the second one-way valve → the water conduit → the second three-way valve → the water outlet pipe → the gas water heater → the water inlet pipe → the first three-way valve → the water supply pipe, so that the energy stored by the backwater is released by the circulating heat preservation module.
When cold water is used at the water using point, the cold water valve at the water using point is opened, the pressure at the first three-way valve is reduced, the cold water valve at the water using point is closed, the pressure at the first three-way valve is increased, and hot water circulation can be formed. When the water consumption point uses hot water, if a hot water valve of the water consumption point is opened, the gas water heater is started, and the water flow direction is as follows: water supply pipe (cold water) → first three-way valve → water inlet pipe → gas water heater (cold water becomes hot water) → water outlet pipe → second three-way valve → hot water pipe → water consumption point; meanwhile, the energy stored by the backwater is released by the circulating heat preservation module, so that the hot water obtained by heating the backwater by the electric water heater flows in the following flowing direction: electric water heater (hot water) → water conduit (hot water) → second three-way valve → hot water pipe → water spot; subsequently, if the hot water valve of the water consumption point is closed, the hot water of the hot water pipe continues to flow due to the residual kinetic energy of the hot water pipe, and the flow direction is as follows: the hot water pipe (hot water) → the return pipe (hot water becomes backwater) → the electric water heater (backwater becomes hot water) → the water conduit → the hot water pipe, circulation is formed until the residual kinetic energy of the hot water in the hot water pipe is exhausted, and the impact influence of the water hammer effect on the pipe network is reduced.
The electric water heater can preserve the returned water with reduced temperature entering from the water return pipe, and when a hot water valve is opened at a water consumption point to use hot water, the gravity difference, the pressure fluctuation and the residual kinetic energy enable the circulation process to be as follows: the backwater in the backwater pipe enters the electric water heater through the first one-way valve → the hot water in the electric water heater enters the water guide pipe → the hot water in the water guide pipe enters the hot water pipe → the hot water in the hot water pipe reaches the water using point → the hot water flows through the backwater pipe to become backwater and enters the electric water heater, so that the electric water heater can play a role in circulating heat preservation, the 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, due to the limiting effect of the second one-way valve, residual hot water in the hot water pipe cannot flow backwards, only can flow through the water return pipe and enter the electric water heater after passing through the first one-way valve, the water hammer effect caused by backflow of the residual hot water is reduced, and the destructive effect of hot water backflow impact is relieved.
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.
Has the advantages that: if the supply line 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 utilization 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, the part of the backwater entering the pressure stabilizing tank is collected, and the backwater can continuously compress the air in the pressure stabilizing tank in the process of entering the pressure stabilizing tank, so that the pressure of the air in the pressure stabilizing tank rises, and the residual kinetic energy and the gravitational potential energy equivalent to the backwater are converted into the elastic potential energy of the air; if the supply pipe pressure is reduced, the hot water will flow in the following direction: electric water heater (hot water) → second one-way valve → water conduit (hot water) → second three-way valve → outlet pipe → gas heater → inlet pipe → first three-way valve → delivery pipe, so that the surge tank utilizes the elastic potential energy that the return water stored to release.
When the water consumption point uses hot water, if a hot water valve of the water consumption point is opened, the gas water heater is started, and the water flow direction is as follows: water supply pipe (cold water) → first three-way valve → water inlet pipe → gas water heater (cold water becomes hot water) → water outlet pipe → second three-way valve → hot water pipe → water consumption point; meanwhile, the pressure stabilizing tank releases the elastic potential energy stored in the backwater, so that the hot water obtained by heating the backwater by the electric water heater flows, and the water flow direction is as follows: electric water heater (hot water) → water conduit (hot water) → second three-way valve → hot water pipe → water spot; subsequently, if the hot water valve of the water consumption point is closed, the hot water of the hot water pipe continues to flow due to the residual kinetic energy of the hot water pipe, and the flow direction is as follows: the hot water pipe (hot water) → the return pipe (hot water becomes backwater) → the electric water heater (backwater becomes hot water) → the water conduit → the hot water pipe, circulation is formed until the residual kinetic energy of the hot water in the hot water pipe is exhausted, and the impact influence of the water hammer effect on the pipe network is reduced.
Therefore, when the return water in the return water pipe enters the electric water heater through the first one-way valve, the return water also enters the pressure stabilizing tank through the third three-way valve, so that the pressure stabilizing tank gradually stores water, and the pressure of air in the pressure stabilizing tank is also increased continuously; when the water consumption point begins to use water, the return water in the pressure stabilizing tank enters 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 the air in the pressure stabilizing tank pushes the hot water in the electric water heater to enter the water conduit; the surge tank plays the effect of stored energy and reposition of redundant personnel, has reduced the impact effect when cold water gets into electric water heater, has improved the life-span, has also reduced the noise to user's experience sense has been improved.
Further, the wet return includes horizontal segment and vertical section, the horizontal segment is provided with the slope, the eminence of horizontal segment is equipped with air relief valve.
Has the advantages that: the solubility of gas in liquid is inversely proportional to the temperature, the higher the temperature of the liquid is, the more violent 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 a water return pipe to form return water is reduced, air dissolved in the water is gradually escaped to form bubbles and gradually accumulates to form air resistance, the flowing speed is influenced, the gradient is arranged on the horizontal section, the bubble accumulation at the high position of the horizontal section is facilitated, the bubble discharge through an automatic exhaust valve arranged at the high position of the horizontal section is facilitated, the influence of the air resistance on the flowing speed is reduced, and the quick return water is facilitated.
Further, the water supply pipe is connected with a main valve.
Has the advantages 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 insulating layer.
Has the advantages that: the hot water heating device can reduce the heat loss of hot water, prevent the temperature reduction of the hot water in the flowing process of the hot water pipe, improve the experience of users and save the electricity of the electric water heater.
Further, the electric water heater keeps warm according to the set temperature.
Has the advantages that: the user can confirm the settlement temperature according to actual need, makes the temperature of the hot water that the water spot came out the same or similar with the temperature that oneself is fit for, improves user's experience and feels.
Based on the above-disclosed circulating pump-free household hot water circulating system, the invention also provides a circulating pump-free household hot water circulating method, which comprises the following steps:
s1, enabling hot water in the gas water heater to enter a second three-way valve from a water outlet pipe and be divided into two paths, wherein one path of hot water reaches a water using point through a hot water pipe, and the other path of hot water enters a water diversion pipe;
s2, making the hot water flow through the water return pipe, the temperature of the hot water is reduced to form return water, the return water enters the circulating heat preservation module, and the return water is preserved by the circulating heat preservation module to form hot water;
s3, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulating heat-preserving module enters a water conduit, and hot water in the water conduit enters a hot water pipe and flows through the hot water pipe to reach a water consumption point;
and S4, the hot water reaching the water using point flows through the water return pipe to become return water, and the return water enters the circulating heat preservation module.
The working principle and the advantages of the invention are as follows: the hot water circulation is pushed by the gravity difference, the pressure fluctuation and the 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 for pushing the flow process is smaller than that of a circulating pump, so that the impact of the hot water flow on a water conduit, a hot water pipe and a water return pipe is reduced, the noise is reduced, and the user experience is improved; the gravity difference, the pressure fluctuation and the residual kinetic energy are used for pushing 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.
Further, in S2, hot water flows through the wet return pipe temperature and falls to become the 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 return water 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 action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulation heat preservation module enters the water conduit, and hot water in the water conduit enters the hot water pipe and flows through the hot water pipe to reach a water consumption point, including: under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the electric water heater enters the water guide pipe, hot water in the water guide pipe enters the hot water pipe, and the hot water in the hot water pipe reaches a water consumption point;
in S4, the hot water reaching the water consumption point flows through the water return pipe to become return water, and enters the circulating heat preservation module, including: the hot water reaching the water using point flows through the water return pipe to become return water, and the return water flows through the first one-way valve to enter the electric water heater.
Has the advantages that: when hot water is needed, the electric water heater can play a role in circulating heat preservation, so that frequent starting of the gas water heater is avoided, and the service life of the gas water heater is prolonged; after the water heater is used, residual hot water cannot flow back 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 through the first one-way valve, so that the water hammer effect caused by residual hot water backflow is reduced, and the destructive effect of hot water backflow impact is relieved.
Further, S2 includes: the return water enters the pressure stabilizing tank through a third three-way valve.
Has the advantages that: the return water gets into the surge tank and makes the surge tank store water gradually, the air in the surge tank can constantly be compressed to the return water, make the pressure of the air in the surge tank rise, be equivalent to the surplus kinetic energy of return water, gravitational potential energy turns into the elastic potential energy of air, when the water consumption point begins to use water, the elastic potential energy that the surge tank stored releases gradually, the surge tank plays energy storage and reposition of redundant personnel, the effect of throttle, the impact effect that the return water got into electric water heater has been reduced, the service life is prolonged, the noise has also been reduced, thereby user's experience is felt to have been improved.
Drawings
Fig. 1 is a block diagram showing a system configuration of a circulation pump-less home hot water circulation system of embodiment 1 of the present invention.
FIG. 2 is a block diagram of the system structure of the circulating heat preservation module of the household hot water circulating system without the circulating pump in embodiment 1 of the present invention
Fig. 3 is a flow chart of a circulation pump-free household hot water circulation method of embodiment 1 of the present invention.
Detailed Description
The following is further detailed by the specific embodiments:
the reference numbers in the drawings of the specification include: the system comprises a gas water heater 1, a water inlet pipe 2, a first three-way valve 3, a water supply pipe 4, a cold water pipe 5, a water outlet pipe 6, a second three-way valve 7, a hot water pipe 8, a water guide pipe 9, a water return pipe 10, a circulating heat preservation module 11, a water consumption point 12, a first one-way valve 13, an electric water heater 14, a second one-way valve 15, a third three-way valve 16, a pressure stabilizing tank 17, an automatic exhaust valve 18 and a main valve 19.
Example 1
An embodiment is substantially as shown in figure 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 in the attached figure 1); the water consumption sites 12 include kitchens, toilets, etc., each of the water consumption sites 12 having two 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 the cold water of the water supply pipe 4 and the flow of the cold water 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 diversion pipe 9, the hot water pipe 8 is connected with a water using point 12, and the hot water pipe 8 is connected with a water return pipe 10; the hot water pipe 8 is coated with the heat preservation layer, the heat preservation layer can reduce the heat loss of hot water, the temperature of the hot water is prevented from being reduced in the flowing process of the hot water pipe 8, the experience feeling of a user can be improved, and the power consumption of the electric water heater 14 can be saved.
A circulating heat-insulating module 11 is connected below the water return pipe 10, and the circulating heat-insulating module 11 is connected with the water diversion pipe 9; the circulation heat preservation module 11 is used for heating the return water that gets into from the wet return 10 and obtains hot water, the circulation heat preservation module 11 is used for utilizing gravity difference, the pressure fluctuation of pipe network and the surplus kinetic energy of return water to promote the hot water circulation, promotes the hot water that the heating obtained and gets into leading water pipe 9, the pipe network includes delivery pipe 4, inlet tube 2, cold water pipe 5, outlet pipe 6, hot-water line 8 and wet return 10.
In this embodiment, as shown in fig. 2, the circulation heat preservation 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 is of a positive displacement type; the electric water heater 14 is used for preserving heat according to the preset temperature of a user, so that the temperature of hot water from the water using point 12 is the same as or similar to the proper temperature of 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 diversion 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 in the cold water pipe 5, hot water is in the hot water pipe 8 generally, 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 flow circularly under the action of gravity difference to form low-temperature return water, the return water enters the circulating heat preservation module 11, the low-temperature return water can be heated by the circulating heat preservation module 11 to form hot water, and the water consumption point 12 is guaranteed to have hot water flowing out at any time.
If the pressure of the water supply pipe 4 increases, the cold water flows in the following direction: the water supply pipe 4 → the first three-way valve 3 → the water inlet pipe 2 → the gas water heater 1 (cold water becomes hot water) → the water outlet pipe 6 → the second three-way valve 7 → the hot water pipe 8 → the water consumption point 12 → the water return pipe 10 (hot water becomes backwater) → the first one-way valve 13 → the third three-way valve 16 → the electric water heater 14 and the surge tank 17, the backwater of the cold water entering the electric water heater 14 is heated to become hot water, the backwater of the portion entering the surge tank 17 is collected, the air in the surge tank 17 is continuously compressed in the process that the backwater enters the surge tank 17, so that the pressure of the air in the surge tank 17 is increased, the residual kinetic energy and the gravitational potential energy equivalent to the backwater are converted into the elastic potential energy of the air, and the residual kinetic energy and the gravitational potential energy of the backwater are converted into the elastic potential energy to be stored by the surge tank 17; if the pressure in the water supply pipe 4 is reduced, the hot water flows in the following direction: the electric water heater 14 → the second check valve 15 → the water conduit 9 → the second three-way valve 7 → the water outlet pipe 6 → the gas water heater 1 → the water inlet pipe 2 → the first three-way valve 3 → the water supply pipe 4, and the pressure-stabilizing tank 17 releases the energy stored in the return water.
When the water consumption point 12 uses cold water, the cold water valve of the water consumption point 12 is opened, the pressure at the first three-way valve 3 is reduced, the cold water valve of the water consumption point 12 is closed, the pressure at the first three-way valve 3 is increased, and hot water circulation is formed. When the water consumption point 12 uses hot water, if a hot water valve of the water consumption point 12 is opened, the gas water heater 1 is started, and the water flow direction is as follows: the water supply pipe 4 (cold water) → the first three-way valve 3 → the water inlet pipe 2 → the gas water heater 1 (cold water becomes hot water) → the water outlet pipe 6 → the second three-way valve 7 → the hot water pipe 8 → the water consumption point 12; at the same time, the energy stored in the return water is released by the surge tank 17, so that the hot water obtained by heating the return water 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 consumption point 12 is closed, the hot water of the hot water pipe 8 will continue to flow due to the residual kinetic energy of the hot water pipe 8, and the flow direction is as follows: the hot water pipe 8 (hot water) → the return pipe 10 (hot water becomes return water) → the electric water heater 14 (return water becomes hot water) → the water supply pipe 9 → the hot water pipe 8, and a circulation is formed until the residual kinetic energy of the hot water in the hot water pipe 8 is exhausted.
The specific implementation process is as follows:
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 a 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 into 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 using point 12 and flows through the water return pipe 10, and the temperature of the hot water is reduced to return water in the process of flowing through the water return pipe 10 and then the hot water 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 the scheme, three cycles of power exist in the hot water circulation: 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 can flow circularly under the action of gravity difference to form low-temperature return water and enter the circulating heat preservation module 11, on the other hand, after the return water in the water return pipe 10 enters the circulating heat preservation module 11, a part of the return water is heated to be changed into hot water, and the residual kinetic energy and the gravitational potential energy of the other part of the return water are collected and converted into elastic potential energy which can also be used as circulating power; secondly, according to hydrodynamics, pressure fluctuation occurs in the flowing process of a pipe network (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 network can also be used as circulating power; finally, the hot water in the hot water pipe 8 has a certain flow speed, and the return water, which is changed by temperature reduction in the process of flowing through the return pipe 10, also has a certain speed, that is, the residual kinetic energy of the return water exists, and the residual kinetic energy of the return water can also be used as circulating power. Under the action of three powers of gravity difference, pressure fluctuation and residual kinetic energy, the circulation process is as follows: the return water in the return pipe 10 enters the circulation heat preservation module 11 → the hot water in the circulation heat preservation module 11 enters the water conduit 9 → the hot water in the water conduit 9 enters the hot water pipe 8 → the hot water flows through the hot water pipe 8 to reach the water consumption point 12 (the hot water reaching the water consumption point 12 comprises the hot water obtained by heating the return water by the circulation heat preservation module 11 and the hot water remained in the original water conduit 9) → the hot water flows through the return pipe 10 to become the return water 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 the difference of gravity, pressure fluctuation and residual kinetic energy, the magnitude order of thrust formed by the three is smaller, the speed for pushing the hot water to flow is smaller compared with that of a circulating pump, and the pressure fluctuation and the residual kinetic energy are consumed as the circulating power, so that the impact of the flowing process on the water conduit 9, the hot water pipe 8 and the water 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 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 the present embodiment, the operation principle of the circulation heat preservation module 11 is detailed as follows: the return water in the return pipe 10 enters the electric water heater 14 through the first check valve 13, and is heated in the electric water heater 14 to become hot water, because the flow direction of the first check valve 13 is downward, the cold water in the return pipe 10 can enter the electric water heater 14, but the hot water in the electric water heater 14 can not enter the return pipe 10; similarly, since the second check valve 15 flows 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 return water with reduced temperature entering from the return pipe 10, and when the water using point 12 uses hot water, the gravity difference, the pressure fluctuation and the residual kinetic energy cause the circulation process as follows: by the way, the circulating heat preservation module 11 realizes heat preservation of hot water circulation, avoids frequent starting of the gas water heater 1 and prolongs the service life of the gas water heater 1; after the water consumption point 12 is used, due to the limiting effect of the second one-way valve 15, residual hot water in the hot water pipe 8 cannot flow backwards 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 backflow of the residual hot water is reduced, and the destructive effect of hot water backflow impact is relieved.
Meanwhile, when the return water in the return water pipe 10 enters the electric water heater 14 through the first one-way valve 13, the return water also enters the pressure stabilizing tank 17 through the third three-way valve 16, so that the pressure stabilizing tank 17 gradually stores water, and in the process that the return water enters the pressure stabilizing tank 17, the air in the pressure stabilizing tank 17 is continuously compressed, so that the pressure of the air in the pressure stabilizing tank 17 is increased, the residual kinetic energy and gravitational potential energy of the return water are converted into elastic potential energy of the air, the pressure stabilizing tank 17 plays a role in storing energy and shunting, the impact effect when the return water 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 use water, the return water in the pressure stabilizing tank 17 enters the electric water heater 14 through the third three-way valve 16, the energy stored in the pressure stabilizing tank 17 is gradually released, the pressure of the air in the pressure stabilizing 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 pressure stabilizing tank 17 is consumed.
Therefore, 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 generally reduced to slow down the flowing 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 minimum power, and the circulating pump generates more or less noise, so that for the prior art, the technical prejudice that the generation of the noise of the hot water circulation is unavoidable exists. However, in the scheme, the gravity difference, the pressure fluctuation and the residual kinetic energy are used for pushing the hot water to circulate, the formed thrust magnitude 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 under an ideal condition. Therefore, the scheme can realize noiseless hot water circulation and overcome the technical bias.
Based on the above household hot water circulation system without the circulation pump, this embodiment further discloses a household hot water circulation method without the circulation pump, as shown in fig. 3, the steps are as follows:
s1, enabling hot water in the gas water heater 1 to enter a second three-way valve 7 from a water outlet pipe 6 and be divided into two paths, wherein one path of hot water passes through a hot water pipe 8 and reaches a water using point 12, and the other path of hot water enters a water guide pipe 9;
s2, the hot water flows through the water return pipe 10, the temperature of the hot water is reduced to become return water, the return water enters the circulating heat preservation module 11, the return water is preserved by the circulating heat preservation module 11 to become hot water, namely, the return water enters the electric water heater 14 through the first one-way valve 13, the return water is heated in the electric water heater 14 to become hot water, and meanwhile, the return water 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 the water consumption 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 consumption point 12;
s4, the hot water reaching the water consumption point 12 flows through the water return pipe 10 and enters the circulating heat preservation module 11, namely, the hot water reaching the water consumption point 12 flows through the water return pipe 10, the temperature of the hot water is reduced to return water, and the return water flows through the first one-way valve 13 and enters the electric water heater 14.
Therefore, when hot water is needed, 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, the water hammer effect caused by the backflow of the residual hot water is reduced, and the destructive effect of hot water backflow impact is relieved; the backwater enters the pressure stabilizing tank 17 to play the roles of storing energy, shunting and throttling, so that the impact of the backwater entering the electric water heater 14 is reduced; when the water consumption point 12 starts to use water, the pressure of the backwater in the pressure stabilizing tank 17 and the pressure of the backwater in the backwater pipe 10 push the hot water in the electric water heater 14 to enter the water conduit 9, and the energy stored in the pressure stabilizing tank 17 is gradually consumed. Therefore, the circulation of hot water is promoted by the difference of gravity, pressure fluctuation and residual kinetic energy, the noise is reduced, the experience feeling of a user is improved, an additional circulating pump does not need to be installed, additional electric energy does not need to be consumed, and the use cost is reduced.
Example 2
The difference from the embodiment 1 is that the water return pipe 10 includes a horizontal section and a vertical section, the horizontal section is provided with a slope, and an automatic exhaust valve 18 is arranged at a high position 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 violent 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 return water, air dissolved in the return water can gradually escape to form bubbles and gradually accumulate to form air resistance, the flowing speed is influenced, the gradient is arranged on the horizontal section, the bubble accumulation at the high position of the horizontal section is facilitated, the automatic exhaust valve 18 arranged at the high position of the horizontal section is facilitated to exhaust the bubbles, the influence of the air resistance on the flowing speed is reduced, and the quick water return is facilitated.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
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 consumption 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 consumption point, and the hot water pipe is connected with a water return pipe;
the device is characterized in that a circulating heat-insulating module is connected below the water return pipe and is connected with a water diversion pipe; the circulating heat-preserving module is used for heating backwater entering from the backwater pipe to obtain hot water, and the circulating heat-preserving module is used for pushing hot water circulation by utilizing gravity difference, pressure fluctuation of a pipe network and residual kinetic energy of the 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.
2. The circulation-pump-free domestic hot water circulation system according to claim 1, wherein the circulation heat preservation module comprises a first one-way valve, the flow direction of the first one-way valve is downward, and an electric water heater is connected to the lower end of the first one-way valve; 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 the water return pipe, and the upper end of the second one-way valve is connected with the water diversion pipe.
3. The circulation pump-free home hot water circulation system of claim 2, wherein 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 surge tank.
4. The circulating pump-free household hot water circulating system as claimed in any one of claims 1 to 3, wherein the water return pipe comprises a horizontal section and a vertical section, the horizontal section is provided with a slope, and an automatic exhaust valve is arranged at a high position of the horizontal section.
5. The circulation pump-free domestic hot water circulation system as claimed in claim 4, wherein a main valve is connected to the water supply pipe.
6. The circulation pump-free home hot water circulation system of claim 5, wherein the hot water pipe is coated with an insulation layer.
7. The circulating pump-free domestic hot water circulation system according to claim 6, wherein the electric water heater is insulated according to a set temperature.
8. A circulation pump-free household hot water circulation method is characterized by comprising the following steps:
s1, enabling hot water in the gas water heater to enter a second three-way valve from a water outlet pipe and be divided into two paths, wherein one path of hot water reaches a water using point through a hot water pipe, and the other path of hot water enters a water diversion pipe;
s2, making the hot water flow through the water return pipe, the temperature of the hot water is reduced to form return water, the return water enters the circulating heat preservation module, and the return water is preserved by the circulating heat preservation module to form hot water;
s3, under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulating heat-preserving module enters a water conduit, and hot water in the water conduit enters a hot water pipe and flows through the hot water pipe to reach a water consumption point;
and S4, the hot water reaching the water using point flows through the water return pipe to become return water, and the return water enters the circulating heat preservation module.
9. The method of circulating water for home use without circulation pump according to claim 8, wherein the step S2 of making the hot water flow through the return pipe to become the return water, which is kept warm by the circulation keeping module to become the hot water, comprises: the return water 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 action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the circulation heat preservation module enters the water conduit, and hot water in the water conduit enters the hot water pipe and flows through the hot water pipe to reach a water consumption point, including: under the action of gravity difference, pressure fluctuation and residual kinetic energy, hot water in the electric water heater enters the water guide pipe, hot water in the water guide pipe enters the hot water pipe, and the hot water in the hot water pipe reaches a water consumption point;
in S4, the hot water reaching the water consumption point flows through the water return pipe to become return water, and enters the circulating heat preservation module, including: the hot water reaching the water using point flows through the water return pipe to become return water, and the return water flows through the first one-way valve to enter the electric water heater.
10. The circulation pump-free household hot water circulation method of claim 9, wherein in S2, the method further comprises: the return water enters the pressure stabilizing tank through a third three-way valve.
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2021
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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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