CN210035687U - Integrated return water heat exchange water tank - Google Patents
Integrated return water heat exchange water tank Download PDFInfo
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- CN210035687U CN210035687U CN201920502087.0U CN201920502087U CN210035687U CN 210035687 U CN210035687 U CN 210035687U CN 201920502087 U CN201920502087 U CN 201920502087U CN 210035687 U CN210035687 U CN 210035687U
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Abstract
The utility model relates to an integrated return water heat transfer water tank belongs to water heater technical field. The heat exchange water tank comprises a water tank, a heat exchanger and a controller, wherein the water tank is provided with a cold water inlet and a hot water outlet which are respectively externally connected with a water source and a water consumption point, and is also provided with a circulating outlet which is connected with the inlet end of the heat exchanger through a main path of a three-way valve and a circulating pump and a circulating inlet which is connected with the outlet end of the heat exchanger; the hot water outlet is also connected with a branch of the three-way valve through a water return pipeline; the signal input end of the controller is respectively connected with a first temperature sensor positioned in the water tank and a second temperature sensor positioned in the water return pipeline, and the control signal output end of the controller is respectively connected with the three-way valve, the circulating pump and the controlled end of the heat source of the heat exchanger. The utility model discloses constitute simple and direct, cost economy, can realize that water tank heating, return water keep warm, the nested water tank of return water heat preservation heats three kinds of operational modes, effectively avoided the frequent start-up of heat source, show to have prolonged its life.
Description
Technical Field
The utility model relates to a water tank, especially an integrated return water heat transfer water tank belongs to water heater technical field.
Background
The water heater comprises a solar water heater, a heat pump water heater, an electric water heater, a gas water heater, a heating and hot water dual-purpose wall-mounted furnace and the like, and in any type, if a hot water source is far away from a water tap of a water consumption point, the use requirement of instant heating and comfortable water consumption cannot be directly met, and instant heating can be realized by adopting an external return water circulating pump to circularly heat a hot water pipe.
The heating mode of the water storage type water heater comprises a static heating mode and a circulating heating mode, and for the static heating type water heater, a heat exchanger is arranged in a water tank, and when the water storage type water heater works, heat exchange is carried out between circulating media from a heat source in the heat exchanger and water in the water tank to heat water in the water tank; for a circulating heating type water heater, a heat exchanger is arranged outside a water tank, and cold water in the water tank is pumped to an external heat exchanger by a circulating pump to be subjected to heat exchange and heating during working and then is circulated back into the water tank.
Therefore, in theory, a circulation heating type hot water system with an instant heating function must be provided with at least two circulation pumps for performing external circulation heating of the water tank and circulation heat preservation of the water return pipeline, respectively, as in the technical solution of application No. 201820352724.6.
In addition, the retrieval shows that the Chinese patent application with the application number of 201610594352.3 discloses a heat pump water heater circulating system, and the technical scheme is that a first three-way valve is arranged on a condenser inlet pipeline, a first electromagnetic valve and a second electromagnetic valve are arranged on a water tank inlet pipeline, and a circulating pump is arranged between the water tank inlet pipeline and a condenser inlet pipeline, so that the heat pump system has a complete-container static circulating heating mode, a dynamic quick heating mode which can be used immediately after being opened and a cold water prevention mode which eliminates a cold water section, and the main advantages of a direct-heating heat pump and a non-direct-heating heat pump are integrated. However, in the technical scheme, an electric three-way valve, two electromagnetic valves and two three-way valves are required to be arranged, so that the structure is complicated, and the cold water prevention function can be realized only by opening a condenser for heating; when the temperature of the pipeline is reduced quickly in winter, the heat source is frequently started, and the service life is influenced. In addition, the non-direct-heating circulating heating is provided with a water tank for heat storage, the power of a required heat source is small, and the direct-heating dynamic heating requires a high-power heat source, so that the whole system needs to be provided with the water tank and the high-power heat source, and the investment is large and the system is not economical.
In addition, the heat exchanger and the water tank of the conventional circulating heating type water heating device are separated from each other, the heating system makes the water in the heating system circularly heated outside the heating system by the aid of a circulating pump of the water tank, the circulating pump is fixed in specification, the distance between a heat source and the water tank is different from place to place, the circulating flow is greatly influenced by the distance between the heat source and the water tank, and the system is easy to operate unstably. For example, when the distance between the heat source and the water tank is long and the circulation resistance is increased, the necessary flow rate of the circulation pump is reduced, and as a result, the heating power is reduced and the energy efficiency cannot be achieved. In addition, since the medium for external circulation heating is tap water in the water tank, and the circulation pipeline is very easy to freeze in a low temperature state in winter, a heat preservation pipe is often required to be configured or heat preservation is carried out in a forced heating circulation mode, and as a result, a pipeline system is complex and troublesome to install.
Disclosure of Invention
The utility model aims at solving the problems in the prior art, providing an integrated backwater heat exchange water tank which can realize two functions of cyclic heating and backwater heat preservation only by a circulating pump and an electric three-way valve and can effectively avoid frequent starting of a heat source, and providing a control method thereof, thereby simplifying a cyclic heating type water heater as much as possible, reducing the cost, facilitating the installation and ensuring stable operation.
In order to achieve the purpose, the utility model discloses integrated return water heat transfer water tank's basic technical scheme does: the water tank is provided with a cold water inlet and a hot water outlet which are respectively externally connected with a water source and a water consumption point, and is also provided with a circulating outlet which is connected with the inlet end of the heat exchanger through a main path of a three-way valve and a circulating pump and a circulating inlet which is connected with the outlet end of the heat exchanger;
the hot water outlet is also connected with a branch of the three-way valve through a water return pipeline;
the signal input end of the controller is respectively connected with a first temperature sensor positioned in the water tank and a second temperature sensor positioned in the water return pipeline, and the control signal output end of the controller is respectively connected with the three-way valve, the circulating pump and the controlled end of the heat source of the heat exchanger.
The utility model discloses further perfect is: the inner pipe of the circulation outlet reaches a position flush with or slightly higher than the cold water inlet.
The utility model discloses further perfect is: the cold water inlet is arranged at the bottommost part of one side of the water tank.
The utility model discloses still further perfect is: the internal connecting pipe orifice of the circulating inlet is higher than the internal connecting pipe orifice of the circulating outlet.
The utility model discloses further perfection is again: the first temperature sensor is arranged at a position higher than the position of the internal connecting pipe orifice of the circulating inlet.
During operation, the utility model discloses the control process of controller does:
the method comprises the steps of firstly, entering a backwater standby state for continuously monitoring a first temperature sensor and a second temperature sensor, and entering the next step;
secondly, receiving a signal of a second temperature sensor, and judging whether the temperature of the return water is lower than a set lower temperature limit; if yes, carrying out the third step, and if not, carrying out the eighth step;
thirdly, switching on a branch of the three-way valve, starting a circulating pump, and carrying out the next step;
fourthly, receiving a signal of the first temperature sensor and judging whether the temperature of the water tank is lower than a set lower temperature limit; if yes, carrying out the next step, otherwise, carrying out the sixth step;
fifthly, starting a heat source and carrying out the next step;
sixthly, receiving signals of the first temperature sensor and the second temperature sensor, and respectively judging whether the temperature of the water tank and the temperature of return water are both higher than corresponding set values; if yes, the next step is carried out, otherwise, the third step is returned;
step seven, stopping the circulating pump, closing the heat source and returning to the step one;
eighthly, entering a standby state of continuously monitoring the first temperature sensor to prepare hot water, and carrying out the next step;
ninth, receiving a signal of the first temperature sensor, and judging whether the temperature of the water tank is lower than a set lower temperature limit; if yes, carrying out the next step, otherwise, returning to the first step;
step ten, switching on a main path of a three-way valve, starting a circulating pump, starting a heat source, and carrying out the next step;
step ten, judging whether the temperature of the water tank is higher than a set value; if yes, carrying out the next step, otherwise, returning to the previous step;
step ten, stopping the circulating pump, turning off the heat source, and carrying out the next step;
and step thirteen, stopping heating water, and returning to the step one.
Compared with the prior art, the utility model has the advantages of it is as follows showing:
1) only one circulating pump and one electric three-way valve can realize three modes of water tank heating, backwater heat preservation and backwater heat preservation nested water tank heating through the switching of the single electric three-way valve and the starting and stopping control of a heat source, and the three modes are simplest in structure, economical in cost and feasible.
2) The backwater heat preservation circulation preferentially takes the water tank as a heat source and is communicated with the circulating pump through a backwater pipeline and an electric three-way valve branch by a hot water outlet. When the temperature of the water tank is higher, hot water in the water tank directly completes return water heat preservation circulation, and cold water in a return water pipeline is circulated back to the water tank; when the temperature of the water tank is lower than the set temperature, the heat source is started in the return water heat preservation circulation process, and the water tank heating and the return water heat preservation are completed at the same time, so that the double purposes are achieved. Because the backwater heat preservation circulation makes full use of the buffering and heat storage functions of the water tank, the heat source does not need to be started every time of circulation.
Drawings
Fig. 1 is a schematic structural diagram (circulation heating tank state) of an embodiment of the present invention.
FIG. 2 is a schematic diagram of the water return cycle state of the embodiment of FIG. 1.
Fig. 3 is a flow chart of the control logic for the embodiment of fig. 1.
Detailed Description
The integrated water return heat exchange water tank of the embodiment is shown in fig. 1 and 2, a heat exchanger 1 and a controller 6 are arranged at the top of the water tank 2, and the heat exchanger 1 and an external heat pump heat source 5 form a heat cycle. The upper part and the lower part of one side of the water tank 2 are respectively provided with a cold water inlet 2-2 and a hot water outlet 2-1 which are externally connected with a water source and a water using point, and the top part of the water tank is also provided with a circulating outlet 2-3 connected with the inlet end of the heat exchanger 1 and a circulating inlet 2-4 connected with the outlet end of the heat exchanger 1 through a main path ac of an electric three-way valve 3 and a circulating pump 4. The hot water outlet 2-1 is also connected with a branch ab of the electric three-way valve 3 through a return water pipeline 2-5. The water source also supplies water to the water consumption point through the cold water branch to be mixed with the hot water.
Referring to chinese patent document entitled "an adaptive instant-heating thermostat device and method" and application number 201610988579.6, the specific structure of the controller 6 has signal input terminals connected to a first temperature sensor T1 located in the water tank 2 and a second temperature sensor T2 located in the return water pipeline 2-5, respectively, and control signal output terminals of the controller 6 connected to the controlled terminals of the electric three-way valve 3, the circulating pump 4, and the heat exchanger heat source 5, respectively.
More specifically, the cold water inlet 2-2 is provided at the lowermost portion of one side of the water tank, so that when a user releases hot water, cold water enters the water tank from the lowermost portion, with less disturbance to the water temperature as a whole, thereby contributing to an increase in the hot water discharge rate. The inner connecting pipe of the circulating outlet 2-3 reaches the position which is flush with or slightly higher than the cold water inlet 2-2, so that water with the lowest water temperature in the water tank can be ensured to be introduced into the heat exchanger for heating during circulating heating, and the heat exchange efficiency is improved. The internal connection pipe orifice of the circulation inlet 2-4 is higher than the internal connection pipe orifice of the circulation outlet 2-3, and hot water heated by the heat exchanger or medium-temperature water from the water return pipe enters the water tank from the circulation inlet, so that the water temperature stratification principle is met (the cold water is deposited at the bottom of the water tank due to high density, and the hot water floats to the upper part of the water tank due to high density), and the water temperature disturbance is avoided. The first temperature sensor T1 is arranged at a position higher than the inscribed pipe orifice of the circulating inlet 2-4, so that the adverse effect of water flow disturbance of return water circulation on high-temperature water temperature display at the upper part of the water tank can be avoided.
In operation, the control process of the controller in this embodiment is as shown in fig. 3, and the specific steps are as follows:
the method comprises the steps of firstly, entering a backwater standby state for continuously monitoring a first temperature sensor and a second temperature sensor, and entering the next step;
secondly, receiving a signal of a second temperature sensor, and judging whether the backwater temperature T2 is lower than a set lower temperature limit Th-3C degrees; if yes, carrying out the third step, and if not, carrying out the eighth step;
thirdly, switching on a branch ab of the electric three-way valve, starting a circulating pump, and carrying out the next step;
fourthly, receiving a signal of the first temperature sensor, and judging whether the temperature T1 of the water tank is lower than a set lower temperature limit Ts-5C degrees; if yes, carrying out the next step, otherwise, carrying out the sixth step;
fifthly, starting a heat source and carrying out the next step;
sixthly, receiving signals T1 and T2 of the first temperature sensor and the second temperature sensor, and respectively judging whether the temperature T1 of the water tank and the temperature T2 of return water are both higher than corresponding set values Ts and Th; if yes, the next step is carried out, otherwise, the third step is returned;
step seven, stopping the circulating pump, closing the heat source and returning to the step one;
eighthly, entering a standby state of continuously monitoring the first temperature sensor to prepare hot water, and carrying out the next step;
ninth, receiving a first temperature sensor signal T1, and judging whether the temperature of the water tank is lower than a set lower temperature limit Ts-5C degrees; if yes, carrying out the next step, otherwise, returning to the first step;
a tenth step of switching on a main path ac of the three-way valve, starting a circulating pump, starting a heat source and carrying out the next step;
step ten, judging whether the water tank temperature T1 is higher than a set value Ts; if yes, carrying out the next step, otherwise, returning to the previous step;
step ten, stopping the circulating pump, turning off the heat source, and carrying out the next step;
and step thirteen, stopping heating water, and returning to the step one.
The integrated water return heat exchange water tank of the embodiment realizes the following switching functions by the control logic:
1) heating water circulation (eighth step)
When the water tank temperature T1 is detected to be lower than the set lower temperature limit Ts-5 thereof → the main circuit ac of the electric three-way valve is conducted → the circulating pump is started → the heat source is started to heat the heat exchanger, namely, the circulating water heating: cold water at the bottom of the water tank passes through a circulating outlet → a main circuit ac of an electric three-way valve → a circulating pump → the cold water absorbs heat in a heat exchanger → the cold water returns to a circulating inlet of the water tank after the water temperature rises to form a heating circulation of the water tank until the temperature of the water tank is detected to be T1 & gt Ts → the heat source stops → the circulating pump stops, and the circulation of heating water is finished.
2) Return water heat preservation circulation (second step)
When the backwater temperature T2 is detected to be lower than the set lower temperature limit Th-3 → the branch ab of the electric three-way valve is conducted → the circulating pump is started → the temperature T1 of the water tank is detected to be higher than the set lower temperature limit Ts-5-the backwater circulation heat preservation of the heat source is not started: hot water in the water tank flows from a hot water outlet → a water return pipe → cold water in the water return pipe flows through an electric three-way valve branch ab → a circulating pump → only flows through a heat exchanger → a circulating inlet returns to the water tank until the return water temperature T2 is more than Th → the circulating pump stops.
3) Hot water making nested in backwater heat preservation circulation
When the return water temperature T2 is detected to be lower than the set lower temperature limit Th-3 → the branch ab of the electric three-way valve is conducted → the circulating pump is started → the temperature T1 of the water tank is detected to be lower than the set lower temperature limit Ts-5-the return water circulation heat preservation of the heat source is started: hot water in the water tank flows from a hot water outlet → a water return pipe → cold water in the water return pipe flows through an electric three-way valve branch ab → a circulating pump → absorbs heat through a heat exchanger → a circulating inlet returns to the water tank until the temperature T1 of the water tank is higher than Ts and the temperature T2 of the water return is higher than Th → the circulating pump stops.
Tests show that the integrated backwater heat exchange water tank has simple and convenient structure and low cost, can realize three operation modes of water tank heating, backwater heat preservation and backwater heat preservation nested water tank heating, backwater heat preservation circulation fully utilizes the buffering and heat storage functions of the water tank, and does not need to start a heat source every circulation, thereby effectively avoiding frequent start of the heat source and obviously prolonging the service life of the integrated backwater heat exchange water tank.
In addition to the above embodiments, the present invention may have other embodiments. For example, the heat exchanger may be an indirect heat exchanger such as a plate exchanger, a sleeve exchanger, and a high-efficiency tank, and the heat source may be a heat pump, a combustion heat, an electric heat, or the like. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.
Claims (5)
1. The utility model provides an integrated return water heat transfer water tank, includes water tank, heat exchanger and controller, the water tank has the cold water import and the hot water export of external water source and water consumption point respectively, its characterized in that: the heat exchanger is also provided with a circulating outlet connected with the inlet end of the heat exchanger through a main path of a three-way valve and a circulating pump and a circulating inlet connected with the outlet end of the heat exchanger;
the hot water outlet is also connected with a branch of the three-way valve through a water return pipeline;
the signal input end of the controller is respectively connected with a first temperature sensor positioned in the water tank and a second temperature sensor positioned in the water return pipeline, and the control signal output end of the controller is respectively connected with the three-way valve, the circulating pump and the controlled end of the heat source of the heat exchanger.
2. The integrated water return heat exchange water tank of claim 1, characterized in that: the inner pipe of the circulation outlet reaches a position flush with or slightly higher than the cold water inlet.
3. The integrated water return heat exchange water tank of claim 1, characterized in that: the cold water inlet is arranged at the bottommost part of one side of the water tank.
4. The integrated water return heat exchange water tank of claim 3, characterized in that: the internal connecting pipe orifice of the circulating inlet is higher than the internal connecting pipe orifice of the circulating outlet.
5. The integrated water return heat exchange water tank of claim 4, characterized in that: the first temperature sensor is arranged at a position higher than the position of the internal connecting pipe orifice of the circulating inlet.
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| CN201920502087.0U CN210035687U (en) | 2019-04-15 | 2019-04-15 | Integrated return water heat exchange water tank |
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| CN201920502087.0U CN210035687U (en) | 2019-04-15 | 2019-04-15 | Integrated return water heat exchange water tank |
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| CN210035687U true CN210035687U (en) | 2020-02-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056938A (en) * | 2019-04-15 | 2019-07-26 | 江苏迈能高科技有限公司 | A kind of integrated return water heat-exchanging water tank and its control method |
| CN112377979A (en) * | 2020-11-06 | 2021-02-19 | 青岛海信日立空调系统有限公司 | Air source heat pump unit |
-
2019
- 2019-04-15 CN CN201920502087.0U patent/CN210035687U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056938A (en) * | 2019-04-15 | 2019-07-26 | 江苏迈能高科技有限公司 | A kind of integrated return water heat-exchanging water tank and its control method |
| CN112377979A (en) * | 2020-11-06 | 2021-02-19 | 青岛海信日立空调系统有限公司 | Air source heat pump unit |
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