CN203203280U - Heat storage water tank applied to electric auxiliary heating indirect type hot water system - Google Patents

Abstract

The utility model discloses a hot water storage tank used in an electric auxiliary heating indirect hot water system, comprising a water tank shell, a cold water inlet, a hot water outlet, a heat exchanger, an electric auxiliary heater and a controller. The middle and lower part of the body is equipped with an arc-shaped cover, and the gap between the edge of the arc-shaped cover and the water tank shell forms a cold water outlet. The top of the shell; the heat exchanger is a corrugated coil heat exchanger, which is located in the heat exchange area; the electric auxiliary heater is located in the middle of the heat exchange area; the temperature sensor A is set in the middle and upper part of the water tank shell, and the temperature sensor B It is arranged at the middle and lower part of the water tank shell and above the arc-shaped cover. The utility model can improve the heat exchange efficiency, increase the volume of available hot water, stabilize the heat storage of the hot water storage tank, meet the demand for a small amount or a large amount of hot water at any time, and effectively reduce the mixing of hot water and cold water in the hot water storage tank. The utilization rate of solar energy is high, and the energy-saving effect is good.

Description

Heat storage tank used in electric auxiliary heating indirect hot water system

technical field

The utility model relates to an electric auxiliary heating indirect hot water system, in particular to a heat storage tank used in the electric auxiliary heating indirect hot water system. the

Background technique

According to whether there is a heat exchanger in the solar water heating system, it can be divided into a direct hot water system and an indirect hot water system. The water in the direct hot water system circulates directly in the water tank, which affects the water quality. The water tank and heat collector are prone to scale formation, and in cold regions, there will be freezing. The indirect hot water system can solve the problem of antifreeze and improve water quality. the

Existing indirect electric auxiliary solar water heater is made up of solar heat collector, thermal insulation water tank, heat exchanger, electric auxiliary heater, water pump, temperature sensor and controller etc. In order to have enough space for solar heat storage, the electric auxiliary heater of the indirect electric auxiliary solar water heater water tank is arranged in the middle of the water tank. The solar water tank of this structure has the following defects: the one, when the solar water heater is only used for bathing, if the solar energy is insufficient, the auxiliary heating can only heat the water in the water tank above the middle part, and there will be insufficient heating water; the other is the solar water heater Hot water needs to be supplied at any time. Under the normal state of electric auxiliary heating, the storage solar energy space of the water tank can only be the lower part of the water tank, which reduces the efficiency of the solar water heater. The larger the volume of the hot water storage tank, the more obvious the above defects. In addition, in the indirect hot water system, there is no stratification between the heat exchange area and the hot water concentration area, so there is a problem to be solved: the heat exchange area needs to strengthen the turbulence to improve the heat exchange efficiency, but this will cause The hot water and cold water in the upper part of the water tank are seriously mixed, which reduces the volume of available hot water. the

Utility model content

The purpose of this utility model is to provide a hot water storage tank used in the electric auxiliary heating indirect hot water system, which can improve the heat exchange efficiency, increase the volume of available hot water, make the heat storage of the hot water tank stable, and meet the requirements at any time. The need for a small amount or a large amount of hot water can effectively reduce the mixing of hot water and cold water in the heat storage tank, and the solar energy utilization rate is high, and the energy saving effect is good. the

In order to achieve the above object, the utility model can take the following technical solutions:

The utility model relates to a hot water storage tank used in an electric auxiliary heating indirect hot water system, comprising a water tank shell, a cold water inlet, a hot water outlet located on the top of the water tank shell, a heat exchanger arranged in the water tank shell, an electric Auxiliary heaters, temperature sensors, and controllers are provided with an arched arc-shaped cover in the middle and lower part of the water tank shell, and the arc-shaped cover divides the water tank shell into the upper heat storage area and the lower part. The heat exchange area, the gap between the edge of the arc-shaped cover and the water tank shell constitutes a cold water port, the cold water inlet is located above the cold water port, and a hot water conduit is provided in the middle of the arc-shaped cover. The upper outlet of the hot water conduit is located on the top of the water tank shell; the heat exchanger is a corrugated coil heat exchanger located in the heat exchange area; the electric auxiliary heater is located in the middle of the heat exchange area; The temperature sensor is two temperature sensors A and B. The temperature sensor A is arranged at the middle and upper part of the water tank housing, and the temperature sensor B is arranged at the middle and lower part of the water tank housing and is located above the arc-shaped cover.

The corrugated coil heat exchanger is composed of a plurality of helical disks stacked longitudinally, the middle inlets of each disk are connected to form a thermal fluid inlet, and the edge outlets of each disk are connected to form a thermal fluid outlet. the

The water tank shell is composed of an inner tank, an insulating layer and an outer shell; the electric auxiliary heater, temperature sensor A, and temperature sensor B are electrically connected to the controller, and the controller is based on temperature sensor A and temperature sensor B. The incoming data controls the startup and shutdown of the electric auxiliary heater. the

Compared with the prior art, the utility model has the beneficial effects that: due to the adoption of the above-mentioned technical scheme, an arc-shaped cover with a raised middle part is provided at the middle and lower part of the water tank shell, and the arc-shaped cover covers the water tank shell. It is divided into the upper heat storage area and the lower heat exchange area. The gap between the edge of the arc-shaped cover and the water tank shell forms a cold water port. The cold water inlet is located above the cold water port. The middle part of the cover is provided with a hot water conduit, the upper outlet of the hot water conduit is located on the top of the water tank shell, and the heat exchanger is a corrugated coil heat exchanger, which is located in the heat exchange area; the electric auxiliary heater Located in the middle of the heat exchange area; the temperature sensor has at least two temperature sensors A and B, which are respectively arranged in the middle upper part and the middle lower part of the water tank shell,

This structure uses the hot water conduit in the middle of the arc-shaped cover and the cold water port on the edge of the arc-shaped cover to connect the heat storage area and the heat exchange area to form a convection cycle, which not only improves the convection efficiency, but also overcomes the problem of cold and hot water. The defect of severe mixing that reduces the volume of available hot water; if the solar energy is insufficient, the electric auxiliary heater can heat the cold water in the heat exchange area, and quickly reach the top through the hot water pipe, there will be no shortage of hot water supply, and the heating will be shortened The time of cold water; using a corrugated coil heat exchanger, when the heat is exchanged between cold and hot water, when the fluid enters the expansion from the shrinking diameter, the boundary layer separation phenomenon will occur. At this time, a fluid blank area will be generated at the expanding diameter. The fluid will flow back to fill the blank area, and the eddy current and lateral flow will be formed at the enlarged diameter, which will have a strong impact on the boundary layer, the retained inner layer and the dirt in the pipe wall, thus reducing the thermal resistance and greatly improving the resistance to corrosion. The heat transfer coefficient, the fluid outside the bellows will also have a similar situation. The application of the bellows structure in the heat exchanger will significantly improve the heat transfer coefficient, and the convection coefficient is 3-7 times that of the light pipe.

When the temperature sensed by the temperature sensor A in the upper part of the water tank does not reach the set value, the controller controls the electric auxiliary heater to turn on and heat the cold water in the heat exchange area, and the hot water enters the upper part of the heat storage area through the hot water pipe, and the bottom of the heat storage area The cold water enters the heat exchange area through the cold water port to be heated. If the water temperature at the upper temperature sensor reaches the set value, the electric auxiliary heater is turned off, and the water temperature in the water tank continues to be heated by solar energy. When the thermal working medium reaches a certain temperature, the thermal work The water enters the corrugated coil heat exchanger, the cold water in the heat exchange area absorbs heat, the temperature rises, the hot water enters the upper part of the heat storage area through the hot water pipe, and the cold water at the bottom of the heat storage area enters the heat exchange area through the cold water port , continue to exchange heat with hot and cold water. When a large amount of hot water is needed, the water temperature at the temperature sensor B in the lower part of the water tank does not reach the set value, and the controller controls the electric auxiliary heater to turn on, and continues to heat the cold water in the heat exchange area. When the temperature there reaches the set value, the electric auxiliary heater is turned off. the

Description of drawings

Fig. 1 is the structural representation of the utility model structure;

Fig. 2 is a structural schematic diagram of the corrugated coil heat exchanger in Fig. 1;

FIG. 3 is an enlarged schematic diagram of the structure of part I in FIG. 2 .

Detailed ways

As shown in Figures 1 to 3, the utility model includes a hot water storage tank used in an electric auxiliary heating indirect hot water system, including a water tank shell, a cold water inlet 1, and a hot water outlet 2 located on the top of the water tank shell , a heat exchanger, an electric auxiliary heater, a temperature sensor, and a controller arranged in the water tank shell, the water tank shell is composed of an inner tank 701, an insulating layer 702 and an outer shell 703; in the middle and lower part of the water tank shell There is an arched arc-shaped cover 3 in the middle, which divides the water tank shell into an upper heat storage area 401 and a lower heat exchange area 402. The edge of the arc-shaped cover 3 is in contact with the water tank shell The gap between them constitutes a cold water port 301. The cold water inlet 1 is located above the cold water port 301. A hot water conduit 302 is provided in the middle of the arc-shaped cover 3. The upper end outlet of the hot water conduit 302 is located in the water tank. The top of the shell; the heat exchanger is a corrugated coil heat exchanger 2, which is located in the heat exchange area 402, and the corrugated coil heat exchanger 2 is composed of a plurality of spiral discs stacked longitudinally , the middle inlets of each disk are connected to form a thermal medium inlet 201, and the edge outlets of each disk are connected to form a thermal medium outlet 202. A corrugated coil heat exchanger is used. When exchanging cold and hot water, when the fluid is compressed When the diameter part 203 enters the diameter expansion part 204, the boundary layer separation phenomenon will occur. At this time, a fluid blank area will be generated at the diameter expansion part, and a part of the fluid will flow back to fill the blank area, and a vortex and a transverse flow will be formed at the diameter expansion part. , The dirt trapped in the inner layer and the pipe wall has a strong impact effect, which reduces the thermal resistance and greatly improves the convective heat transfer coefficient. The fluid will also have a similar situation outside the bellows. The bellows structure is used in The heat transfer coefficient will be significantly improved in the heat exchanger, and the convection coefficient is 3-7 times that of the light tube; the electric auxiliary heater 5 is located in the middle of the heat exchange area 402; the temperature sensors are temperature sensors A, B601, 602 two, the temperature sensor A601 is arranged on the middle and upper part of the water tank shell, and the temperature sensor B602 is arranged on the middle and lower part of the water tank shell and is located above the arc-shaped cover 3; the electric auxiliary heater 5, the temperature sensor A601, the temperature The sensor B602 is electrically connected to the controller, and the controller controls the start and stop of the electric auxiliary heater 5 according to the data from the temperature sensor A601 and the temperature sensor B602. the

Claims (3)

1. A hot water storage tank used in an electric auxiliary heating indirect hot water system, including a water tank shell, a cold water inlet (1), a hot water outlet (2) located on the top of the water tank shell, and a The heat exchanger, electric auxiliary heater, temperature sensor, and controller are characterized in that: an arc-shaped cover (3) arched in the middle is provided at the middle and lower part of the water tank shell, and the arc-shaped cover ( 3) Divide the water tank shell into the upper heat storage area (401) and the lower heat exchange area (402), and the gap between the edge of the arc-shaped cover (3) and the water tank shell forms the cold water port (301) , the cold water inlet (1) is located above the cold water port (301), a hot water conduit (302) is provided in the middle of the arc-shaped cover (3), and the upper end outlet of the hot water conduit (302) is located at The top of the water tank shell; the heat exchanger is a corrugated coil heat exchanger (2), which is located in the heat exchange area (402); the electric auxiliary heater (5) is located in the heat exchange area (402) The middle part; the temperature sensors are two temperature sensors A and B (601, 602), the temperature sensor A (601) is set in the middle and upper part of the water tank shell, and the temperature sensor B (602) is set in the middle and lower part of the water tank shell and Located above the curved cover (3). 2. The hot water storage tank used in the electric auxiliary heating indirect hot water system according to claim 1, characterized in that: the corrugated coil heat exchanger (2) consists of a plurality of spiral discs along the longitudinal direction In a stacked structure, the middle inlets of each disk are connected to form a thermal working medium inlet (201), and the edge outlets of each disk are connected to form a thermal working medium outlet (202). 3. The hot water storage tank used in the electric auxiliary heating indirect hot water system according to claim 1 or 2, characterized in that: the water tank shell is composed of an inner tank (701), an insulation layer (702) and an outer shell (703) composition; the electric auxiliary heater (5), temperature sensor A (601), temperature sensor B (602) are electrically connected to the controller, and the controller is based on the temperature sensor A (601), temperature sensor The data sent from B (602) controls the starting and closing of the electric auxiliary heater (5).

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