阅读说明：本技术 热水系统 (Hot water system ) 是由 费家哲 杨磊 魏爱国 李伟 门广岳 吴绍杰 李羲龙 于 2020-04-08 设计创作，主要内容包括：本发明提供的热水系统,属于热水器技术领域,该热水系统包括通过水箱以及换热器,水箱具有热水入口、热水出口、冷水出口和冷水入口,换热器具有换热入口和换热出口,热水系统具有第一工作状态,在第一工作状态时,冷水入口与用水冷端连接；冷水出口与换热入口连接；换热出口与热水入口连接；热水出口与用水热端连接。当正常使用热水时,用水冷端的冷水入口进入水箱,并从冷水出口经换热入口进入换热器,进行加热,经换热器加热的热水由换热出口、热水入口进入水箱,最后从热水出口进入用水热端的加热方式,实现了冷水与换热器之间的直接接触,这样换热器的热量直接用于加热冷水,提高了热能的利用率。(The invention provides a hot water system, which belongs to the technical field of water heaters and comprises a water tank and a heat exchanger, wherein the water tank is provided with a hot water inlet, a hot water outlet, a cold water outlet and a cold water inlet; the cold water outlet is connected with the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water. When the hot water is normally used, the cold water inlet of the cold end of the water enters the water tank, the cold water enters the heat exchanger through the heat exchange inlet from the cold water outlet, the hot water heated by the heat exchanger enters the water tank through the heat exchange outlet and the hot water inlet, and finally the hot water enters the heating mode of the hot end of the water from the hot water outlet, so that the direct contact between the cold water and the heat exchanger is realized, the heat of the heat exchanger is directly used for heating the cold water, and the utilization rate of the heat energy is improved.)

1. A hot water system, comprising: a water tank and a heat exchanger;

the water tank is provided with a hot water inlet, a hot water outlet, a cold water outlet and a cold water inlet, and the heat exchanger is provided with a heat exchange inlet and a heat exchange outlet;

the hot water system has a first working state, and the cold water inlet is connected with the cold end of the water in the first working state; the cold water outlet is connected with the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water;

cold water at the water using cold end enters the water tank through the cold water inlet, and enters the heat exchanger from the cold water outlet through the heat exchange inlet, and hot water heated by the heat exchanger enters the water tank from the heat exchange outlet and the hot water inlet, and enters the water using hot end from the hot water outlet.

2. The water heating system according to claim 1, wherein the water tank has a heating element for heating;

the hot water system has a second working state, and in the second working state, the cold water inlet is connected with the cold end of the water, and the hot water outlet is connected with the hot end of the water;

and cold water at the cold end of the water consumption enters the water tank through the cold water inlet, and enters the hot end of the water consumption from the hot water outlet after being heated by the heating element.

3. The hot water system as claimed in claim 1, wherein a first one-way valve is provided between the cold and hot water ends for allowing flow from the hot water end to the cold water end.

4. The hot water system as claimed in claim 3, wherein the hot water system has a first cold zero water condition in which the water cold end is connected to the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water;

cold water between the hot water outlet and the water using hot end enters the heat exchanger through the first one-way valve, the water using cold end and the heat exchange inlet, hot water heated by the heat exchanger enters the water tank through the heat exchange outlet and the hot water inlet, and enters the water using hot end from the hot water outlet.

5. The hot water system as claimed in claim 4, wherein the water heater has a second zero cold water condition in which the water cold end is connected to the heat exchange inlet; the heat exchange outlet is connected with the water hot end; cold water between the heat exchange outlet and the water hot end enters the heat exchanger through the first one-way valve, the water cold end and the heat exchange inlet, and hot water heated by the heat exchanger enters the water hot end through the heat exchange outlet.

6. The water heating system according to claim 5, wherein a first control valve is disposed between the heat exchange outlet and the hot water inlet; a second control valve is arranged between the hot water outlet and the hot water end; the first control valve is connected with the second control valve;

a third control valve and a circulating pump are sequentially arranged between the cold water outlet and the heat exchange inlet; a fourth control valve is arranged between the cold water inlet and the cold water end, and the third control valve is connected with the fourth control valve;

and in the first working state, the first control valve is disconnected with the second control valve, and the third control valve is disconnected with the fourth control valve.

7. The water heating system according to claim 6, wherein in the first zero cold water condition, the first control valve is disconnected from the second control valve, the third control valve is disconnected from the cold water outlet, and the fourth control valve is disconnected from the cold water inlet.

8. The water heating system according to claim 7, wherein in the second zero cold water condition the first control valve is disconnected from the hot water inlet, the second control valve is disconnected from the hot water outlet, the third control valve is disconnected from the cold water outlet, and the fourth control valve is disconnected from the cold water inlet.

9. A hot water system according to any one of claims 6-8, characterized in that a second one-way valve is arranged between the first control valve and the hot water inlet; a third one-way valve is arranged between the second control valve and the hot water outlet; a fourth one-way valve is arranged between the third control valve and the cold water outlet; and a fifth one-way valve is arranged between the fourth control valve and the cold water inlet.

10. The hot water system as claimed in any one of claims 1 to 8, wherein the tank has therein a first water pipe connected to the hot water inlet, a second water pipe connected to the hot water outlet, a third water pipe connected to the cold water outlet, and a fourth water pipe connected to the cold water inlet;

the first water pipe and the second water pipe extend to the top of the water tank, the third water pipe and the fourth water pipe are located at the bottom of the water tank, the first water pipe is higher than the second water pipe, and the third water pipe is lower than the fourth water pipe.

Technical Field

The invention relates to the technical field of water heaters, in particular to a hot water system.

Background

The hot water system is a device capable of heating cold water into hot water, and then providing hot water with a proper temperature for a user, and can be a gas water heater, a wall-mounted solar water heater or other forms of water heaters.

Use wall-hanging solar water heater as an example, wall-hanging solar water heater is connected at the water tank including installing the heat exchanger on the balcony usually and with the heat exchanger, and the water tank is bilayer structure usually, the synthetic confined intermediate layer space of enclosing between the bilayer, and this intermediate layer space is used for storing heat transfer medium, and the cold water in the heat exchanger absorbed heat energy transmission to the water tank through heat transfer medium to the realization is to the cold water heating in the water tank, and then forms hot water, and finally, hot water flows to the water equipment in from the play water pipe of water tank.

However, in the process of heat exchange between the heat exchange medium and cold water, heat loss exists, and resource waste is caused.

Disclosure of Invention

The invention provides a hot water system, which aims to solve the problems of heat loss and resource waste of the hot water system in the related technology.

The invention provides a hot water system which comprises a water tank and a water heater.

The water tank is provided with a hot water inlet, a hot water outlet, a cold water outlet and a cold water inlet, and the heat exchanger is provided with a heat exchange inlet and a heat exchange outlet.

The hot water system has a first working state, and the cold water inlet is connected with the cold end of the water in the first working state; the cold water outlet is connected with the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water.

Cold water at the water using cold end enters the water tank through the cold water inlet, and enters the heat exchanger from the cold water outlet through the heat exchange inlet, and hot water heated by the heat exchanger enters the water tank from the heat exchange outlet and the hot water inlet, and enters the water using hot end from the hot water outlet.

The hot water system as described above, wherein the water tank has a heating member therein for heating.

The hot water system has a second working state, and in the second working state, the cold water inlet is connected with the cold end of the water, and the hot water outlet is connected with the hot end of the water.

And cold water at the cold end of the water consumption enters the water tank through the cold water inlet, and enters the hot end of the water consumption from the hot water outlet after being heated by the heating element.

The hot water system as described above, wherein a first one-way valve is provided between the water cold end and the water hot end, and the first one-way valve is used for enabling water to flow from the water hot end to the water cold end.

The hot water system as described above, wherein the hot water system has a first zero cold water condition in which the water cold end is connected to the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water.

Cold water between the hot water outlet and the water using hot end enters the heat exchanger through the first one-way valve, the water using cold end and the heat exchange inlet, hot water heated by the heat exchanger enters the water tank through the heat exchange outlet and the hot water inlet, and enters the water using hot end from the hot water outlet.

The hot water system as above, wherein the water heater has a second zero cold water state, and the heat exchange outlet is connected with the hot water end in the second zero cold water state; the water cold end is connected with the heat exchange inlet; cold water between the heat exchange outlet and the water hot end enters the heat exchanger through the first one-way valve, the water cold end and the heat exchange inlet, and hot water heated by the heat exchanger enters the water hot end through the heat exchange outlet.

The hot water system as described above, wherein a first control valve is provided between the heat exchange outlet and the hot water inlet; a second control valve is arranged between the hot water outlet and the hot water end; and the first control valve is connected with the second control valve.

A third control valve and a circulating pump are sequentially arranged between the cold water outlet and the heat exchange inlet; and a fourth control valve is arranged between the cold water inlet and the cold water end, and the third control valve is connected with the fourth control valve.

And in the first working state, the first control valve is disconnected with the second control valve, and the third control valve is disconnected with the fourth control valve.

The hot water system as claimed above, wherein in the first zero cold water condition, the first control valve is disconnected from the second control valve, the third control valve is disconnected from the cold water outlet, and the fourth control valve is disconnected from the cold water inlet.

The hot water system as claimed above, wherein in the second zero cold water state, the first control valve is disconnected from the hot water inlet, the second control valve is disconnected from the hot water outlet, the third control valve is disconnected from the cold water outlet, and the fourth control valve is disconnected from the cold water inlet.

The hot water system as described above, wherein a second check valve is provided between the first control valve and the hot water inlet; a third one-way valve is arranged between the second control valve and the hot water outlet; a fourth one-way valve is arranged between the third control valve and the cold water outlet; and a fifth one-way valve is arranged between the fourth control valve and the cold water inlet.

The hot water system as described above, wherein the tank has therein a first water pipe connected to the hot water inlet, a second water pipe connected to the hot water outlet, a third water pipe connected to the cold water outlet, and a fourth water pipe connected to the cold water inlet.

The first water pipe and the second water pipe extend to the top of the water tank, the third water pipe and the fourth water pipe are located at the bottom of the water tank, the first water pipe is higher than the second water pipe, and the third water pipe is lower than the fourth water pipe.

The hot water system provided by the invention is provided with the water tank and the heat exchanger, wherein the water tank is provided with a hot water inlet, a hot water outlet, a cold water outlet and a cold water inlet, the heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, the hot water system has a first working state, and the cold water inlet is connected with the cold end of water in the first working state; the cold water outlet is connected with the heat exchange inlet; the heat exchange outlet is connected with the hot water inlet; the hot water outlet is connected with the hot end of the water. When the hot water is normally used, a cold water inlet of a water cold end enters the water tank, the hot water heated by the heat exchanger enters the water tank through a heat exchange inlet, and finally enters a heating mode of a water hot end from a hot water outlet, so that the direct contact between the cold water and the heat exchanger is realized, the heat of the heat exchanger is directly used for heating the cold water, the utilization rate of the heat energy is improved, and further, the problems that in the related technology, the heat of the heat exchanger is firstly used for heating a heat exchange medium, and then the heat of the heat exchange medium is used for heating the heating mode of the cold water in the water tank are solved, the heat loss is large, and the cost is high are solved. In addition, the hot water system also has a first zero cold water state and a second zero cold water state, so that hot water can be always arranged between the hot water outlet and the hot water end, and the effect of instant heating after opening is achieved.

Drawings

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description set forth herein is merely illustrative and explanatory of the present invention and is not restrictive of the invention as claimed below.

FIG. 1 is a schematic diagram of a hot water system in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a first operating condition of the hot water system in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second operating condition of the hot water system in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a first cold water zero state of the hot water system in an embodiment of the present invention;

FIG. 5 is a schematic diagram of a second zero cold water condition of the hot water system in an embodiment of the present invention.

Description of reference numerals:

10: a water tank; 11: a hot water inlet; 12: a hot water outlet; 13: a cold water outlet; 14: a cold water inlet;

20: a heat exchanger; 21: a heat exchange inlet; 22: a heat exchange outlet;

30: cooling with water; 40: heating the end by water; 50: a first check valve; 60: a first control valve; 70: a second control valve; 80: a third control valve; 90: a fourth control valve; 100: a second one-way valve; 110: a third check valve; 120: a fourth check valve; 130: a fifth check valve;

140: a first water pipe; 150: a second water pipe; 160: a third water pipe; 170: a fourth water pipe; 180: and a circulating pump.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description set forth herein is merely illustrative and explanatory of the present invention and is not restrictive of the invention as claimed below.

A wall-mounted solar water heater is a common household appliance, and is used for heating cold water into hot water to provide hot water at a suitable temperature for a user.

Among the correlation technique, wall-hanging solar water heater includes heat exchanger and water tank, and under the normal condition, heat exchanger and water tank are installed on the balcony, and the water tank is for having the bilayer structure in intermediate layer space, and this intermediate layer space is used for storing heat transfer medium, and heat transfer medium transmits the heat energy that the heat exchanger absorbed to the cold aquatic in the water tank to the realization is to the cold water heating in the water tank, and then forms hot water, and finally, hot water flows to the water equipment from the play water pipe of water tank. The water equipment can mix the water valve, mixes the water valve and can have the water cold junction, water hot junction and the export of intercommunication each other, and wherein, the water hot junction can with the hot water exit linkage of water tank, the water cold junction can be connected with municipal water supply system, like this, hot water and cold water mix in mixing the water valve to from the export outflow, in addition, the water cold junction can also be connected with the water tank, in order to lead to cold water into the water tank, and then realize follow-up heating process.

However, in the wall-mounted solar water heater, heat loss exists in the heat exchange process between the heat exchange medium and cold water, which causes resource waste. In addition, heat exchanger and water tank are installed on the balcony, and the water equipment is in the bathroom, and like this, the connecting tube between water tank and the water equipment is longer, and the water in the connecting tube is cold water, and when the user used, need emit the cold water in the connecting tube in advance, just can emit hot water, has caused the waste of water resource, has increased the cost.

In order to solve the above technical problem, this embodiment provides a hot water system, through making cold water loop through water tank, heat exchanger, water tank and hot end with water for cold water directly absorbs the heat of heat exchanger, has improved the heat utilization efficiency.

FIG. 1 is a schematic diagram of a hot water system in an embodiment of the present invention; fig. 2 is a schematic diagram of a first operating state of the hot water system in an embodiment of the present invention.

The hot water system can be of various types, such as an electric water heater and a gas water heater, and particularly, the hot water system can be a wall-mounted solar water heater, which is taken as an example for convenience of description.

Referring to fig. 1 and 2, the present embodiment provides a hot water system, which includes a water tank 10 and a heat exchanger 20.

The water tank 10, as a water storage container of the hot water system, may include a housing and an inner container disposed in the housing, and a synthetic installation space is enclosed between the housing and the inner container, wherein a heat insulation layer may be disposed in the installation space to reduce the heat loss in the inner container. In addition, the water tank 10 may have a cylindrical shape, and both ends of the water tank 10 may be designed to have arc shapes in order to enhance the aesthetic appearance of the water tank 10.

The water tank 10 may have a hot water inlet 11, a hot water outlet 12, a cold water outlet 13, and a cold water inlet 14, wherein the hot water inlet 11, the hot water outlet 12, the cold water outlet 13, and the cold water inlet 14 may be spaced apart from each other on a side wall or a bottom wall of the water tank 10.

The heat exchanger 20 is used as a heating component of the hot water system, and may have a heat exchange inlet 21 and a heat exchange outlet 22, for example, the heat exchanger 20 may include a supporting bracket and a plurality of vacuum heat collecting pipes connected in series and mounted on the supporting bracket, wherein one end of one vacuum heat collecting pipe is connected to the cold water outlet 13, and the end forms the heat exchange inlet 21; one end of a vacuum heat collecting pipe is connected with the hot water inlet 11, the vacuum heat collecting pipe forms a heat exchange outlet 22, so that cold water is heated in the heat exchanger, and the heated hot water is introduced into the water tank for later use.

When cold water needs to be heated, the cold water can be heated in the following mode, and the cold water inlet 14 is connected with the water cold end 30, so that the cold water can be conveniently introduced into the water tank 10; the cold water outlet 13 can be connected with a heat exchange inlet 21 of the heat exchanger 20 and is used for introducing cold water into the heat exchanger 20 for heating; the heat exchange outlet 22 is connected with the hot water inlet 11, so that heated hot water is introduced into the water tank 10 through the hot water inlet 11 for storage; the hot water outlet 12 is connected to a hot water end 40 to satisfy the user's demand for hot water. The water-using cold end 30 and the cold water inlet 14, the cold water outlet 13 and the heat exchange inlet 21, the heat exchange outlet 22 and the hot water inlet 11, and the hot water outlet 12 and the water-using hot end 40 can be connected through pipelines.

It will be appreciated that in order to facilitate rapid entry of cold water from the water tank 10 into the heat exchanger 20, a circulation pump 180 may be provided between the cold water outlet 13 and the heat exchanger 20, and when the circulation pump 180 is operated, the cold water may be powered to increase the flow rate of the cold water.

The hot water system that this embodiment provided, the cold water that gets into water tank 10 through cold water inlet 14 with water cold end 30 to get into heat exchanger 20 through heat transfer entry 21 from cold water outlet 13, heat, hot water after the heating gets into the water tank by heat transfer exit 22, hot water inlet 11, get into the heating mode with water hot end 40 from hot water outlet 12 at last, realized the direct contact between cold water and the heat exchanger 20, the heat of heat exchanger is directly used for heating cold water like this, the utilization ratio of heat energy is improved, and the cost is reduced.

Fig. 3 is a schematic view showing a second operation state of the hot water system in the embodiment of the present invention, referring to fig. 3, in another alternative embodiment, a heating member for heating is provided in the water tank 10; the hot water system has a second working state, when in the second working state, the cold water inlet 14 is connected with the water cold end 30, and the hot water outlet 12 is connected with the water hot end 40; cold water from the hot water inlet 30 enters the water tank 10 through the cold water inlet 14, is heated by the heating element, and then enters the hot water outlet 12 to the hot water end 40.

Because the weather state is changeable, when touchhing overcast and rainy weather, the evacuated collector tube of heat exchanger can not receive sufficient heat energy, is difficult to obtain suitable temperature, consequently, this embodiment has set up the heating member in water tank 10, and the heating member can with electric power intercommunication, utilizes the mode that the heating member circular telegram generates heat to heat cold water, with the mode of solar energy heating, complements each other, can select the heating method according to the weather condition to guarantee hot water system's normal function.

The heating member can be for setting up the heating pipe in water tank 10, and wherein, the heating pipe can stretch into water tank 10 in one end distance to increase the heating area of heating pipe, the cold water in the heating water tank that can be quick. In addition, the shape of the heating pipe may be selected in many ways, for example, the heating pipe may be cylindrical, U-shaped or circular, and preferably, the heating pipe may be circular, which can both reduce the occupied proportion of the space in the water tank 10 and ensure the heating efficiency.

When the electric heating mode is required, that is, the hot water system has the second operation state, the connection between the cold water outlet 13 and the heat exchange inlet 21 and the connection between the heat exchange outlet 22 and the hot water inlet 11 need to be disconnected to temporarily interrupt the solar heating mode.

When the hot water system is in the second working state, the cold water inlet 14 is connected with the water cold end 30; the hot water outlet 12 is connected to the hot water end 40, and at this time, cold water at the cold water end 30 enters the water tank 10 through the cold water inlet 14, and then the cold water is heated by a heating element in the water tank 10, and the heated hot water enters the hot water end 40 from the hot water outlet 12.

In this embodiment, the hot water system has first operating condition and second operating condition, can realize switching between two states according to weather condition, can be abundant utilize natural resources, also can guarantee user's normal use. The switching between the first working state and the second working state may be performed manually or automatically by using a control program, which is not limited in this embodiment.

Taking the automatic switching between the first operating state and the second operating state as an example, the following detailed description is made:

the hot water system also comprises a control module, the control module comprises a controller, a first temperature sensor and a second temperature sensor, the first temperature sensor and the second temperature sensor are both connected with the controller, and the controller is also in signal connection with the circulating pump; wherein, first temperature sensor sets up in water tank 10 for detect the temperature of water in the water tank 10, and second temperature sensor can set up heat transfer export 22 department, is used for detecting the temperature of heat transfer export 22, and first temperature sensor and second temperature sensor can transmit detected signal to controller, and the controller is used for controlling opening of circulating pump according to first temperature sensor and second temperature sensor's detected signal.

The controller transmits a control command according to a temperature difference between the first temperature sensor and the second temperature sensor. Taking the temperature of the first temperature sensor T1 and the temperature of the second temperature sensor T2 as examples, the control program is described, the controller has a first temperature threshold and a second temperature threshold, and when T2-T1 is greater than the first temperature threshold, the controller generates a signal for starting the circulation pump to operate the first operating state, that is, start the solar thermal cycle. When the temperature T2-T1 is smaller than the second temperature threshold value, the second working state is started, and the heating element in the water tank is used for heating the water in the water tank, so that the solar energy resource can be fully utilized, and the hot water in the hot water system can be ensured to be always hot water. It is understood that the first temperature threshold and the second temperature threshold are selected according to the actual usage status, for example, the first temperature threshold may be 7-9 deg.C, and the second temperature threshold may be 2-4 deg.C.

In an alternative embodiment, a first check valve 50 is provided between the water cold side 30 and the water hot side 40, the first check valve 50 being adapted to allow flow from the water hot side 40 to the water cold side 30, to avoid backflow of cold water from the water cold side 30 to the water hot side 40, and to reduce the temperature of the water hot side 40.

In an alternative embodiment, the hot water system has a first cold water zero state, wherein the cold water zero state means that the water in the pipe between the hot water outlet 12 and the water consumer is always hot water, and the instant heating on state is actually realized.

Fig. 4 is a schematic diagram illustrating a first cold water zero state of the hot water system according to an embodiment of the present invention, please refer to fig. 4, wherein when the hot water system is in the first cold water zero state, the water cold end 30 is connected to the heat exchange inlet 21; the heat exchange outlet 22 is connected with the hot water inlet 11; the hot water outlet 12 is connected with a hot water end 40; the cold water between the hot-water end 40 and the hot-water outlet 12 is heated by using the heat in the heat exchanger 20, and then the heated hot water is re-delivered to the hot-water end 40. At this time, it is necessary to disconnect the pipe between the water cooling end 30 and the cold water inlet 14 and the pipe between the cold water outlet 13 and the heat exchange inlet 21, so as to prevent the cold water at the water cooling end 30 from directly entering the water tank 10 and reduce the temperature of the water in the water tank 10.

When a user needs hot water, a first zero cold water state is started, cold water between the hot water outlet 12 and the hot water end 40 enters the heat exchanger 20 through the first check valve 50, the water cold end 30 and the heat exchange inlet 21, hot water heated by the heat exchanger 20 enters the water tank 10 through the heat exchange outlet 22 and the hot water inlet 11 and enters the hot water end 40 from the hot water outlet 12, and therefore cold water between the initial hot water outlet 12 and the hot water end 40 is replaced by hot water; at the moment, the first working state or the second working state is started again, so that hot water can be released, and the function of saving resources is achieved.

Wherein, in order to facilitate the rapid delivery of the cold water from the water cold end 30 to the heat exchange inlet 21, a circulation pump 180 between the cold water outlet 13 and the heat exchange inlet 21 may be utilized to increase the pumping efficiency.

In order to ensure the punctuality of the start of the first zero-cold water state, the automatic control module can be used for controlling the start and the stop of the first zero-cold water state, and the control module further comprises a third temperature sensor arranged at the hot end of the water, wherein the temperature is marked as T3, and the temperature difference between T1 and T3 is used as the basis for starting and stopping the circulating pump.

In an alternative embodiment, the hot water system also has a second zero cold water condition. Fig. 5 shows a second zero-cold state of the hot water system according to the embodiment of the present invention, referring to fig. 5, when the hot water system is in the second zero-cold state, the water cooling end 30 is connected to the heat exchange inlet 21; the heat exchange outlet 22 is connected with a water hot end 40; the cold water between the hot water using end 40 and the hot water outlet 12 is heated by using the heat in the heat exchanger 20, and then the heated hot water is delivered to the hot water using end 40. At this time, the connections between the cold water inlet 14 and the water cold end 30, between the cold water outlet 13 and the heat exchange inlet 21, between the heat exchange outlet 22 and the hot water inlet 11, and between the hot water outlet 12 and the hot water end 40 need to be disconnected, so that the cold water between the heat exchange outlet 22 and the hot water end 40 directly enters the heat exchanger 20 through the first check valve 50, the water cold end 30 and the heat exchange inlet 21, and the hot water heated by the heat exchanger enters the hot water end 40 through the heat exchange outlet 22, thereby meeting the requirement of instant heating.

In this embodiment, the circulation pump 180 in the first operating state is directly used to convey the cold water in the heat exchange outlet 22 and the hot water end 40 to the heat exchanger 20 for continuous heating, so that the dual-purpose function of one pump is realized, and the resources are saved. In addition, cold water in the heat exchange outlet 22 and the hot water end 40 is directly conveyed into the heat exchanger 20, so that the processes that the heat exchange outlet 22 reaches the water tank 10 and the water tank 10 reaches the hot water end 40 are reduced, and the heat loss of hot water in the conveying process is reduced.

In order to ensure the punctuality of the starting of the second zero-cold water state, the automatic control module can be used for controlling the starting and the closing of the second zero-cold water state, the control module further comprises a third temperature sensor arranged at the hot end of the water, the temperature is marked as T3, and the temperature difference between T2 and T3 is used as the basis for starting and stopping the circulating pump.

With continued reference to fig. 1, in order to effect switching between the various operating states, a first control valve 60 is provided between the heat exchange outlet 22 and the hot water inlet 11; a second control valve 70 is arranged between the hot water outlet 12 and the water hot end 40; and the first control valve 60 is connected with the second control valve 70; a third control valve 80 and a circulating pump 180 are sequentially arranged between the cold water outlet 13 and the heat exchange inlet 21; a fourth control valve 90 is arranged between the cold water inlet 14 and the water cold end 30, and the third control valve 80 is connected with the fourth control valve 90. The first control valve 60, the second control valve 70, the third control valve 80, and the fourth control valve 90 are three-way valves.

With continued reference to fig. 2, in the first operating state, the first control valve 60 is disconnected from the second control valve 70, so that the heat exchange outlet 22 is communicated with the hot water inlet 11 through the first control valve 60, and the hot water outlet 12 is communicated with the hot water end 40 through the second control valve 70; meanwhile, the third control valve 80 and the fourth control valve 90 are disconnected from each other, so that the cold water outlet 13 is communicated with the heat exchange inlet 21 through the third control valve 80, and the water cold side 30 is communicated with the cold water inlet 14 through the fourth control valve 90. Finally, the process of solar thermal cycle is realized.

That is, the cold water at the water cold end 30 passes through the fourth control valve 90, the cold water inlet 14, the water tank 10, the cold water outlet 13, the third control valve 80, the circulation pump 180, the heat exchange inlet 21, the heat exchange outlet 22, the first control valve 60, the hot water inlet 11, the water tank 10, the hot water outlet 12, the second control valve 70 and the water hot end 40 in sequence, and the whole heating cycle is completed.

With continued reference to fig. 4, in the first zero cold water state, the first control valve 60 is disconnected from the second control valve 70, the third control valve 80 is disconnected from the cold water outlet 13, and the fourth control valve 90 is disconnected from the cold water inlet 14, so that the heat exchange outlet 22 is communicated with the hot water inlet 11 through the first control valve 60, and the hot water outlet 12 is communicated with the hot water end 40 through the second control valve 70; meanwhile, the water cooling side 30 communicates with the heat exchange inlet 21 through the fourth and third control valves 90 and 80.

That is, the cold water between the hot water outlet 12 and the hot water end 40 passes through the first check valve 50, the fourth control valve 90, the third control valve 80, the circulating pump 180, the heat exchange inlet 21, the heat exchange outlet 22, the first control valve 60, the hot water inlet 11, the water tank 10, the hot water outlet 12, the second control valve 70 and the hot water end 40 in sequence, and the whole first zero-cold water system is completed.

With continued reference to fig. 5, in the second zero cold water condition, the first control valve 60 is disconnected from the hot water inlet 11, the second control valve 70 is disconnected from the hot water outlet 12, the third control valve 80 is disconnected from the cold water outlet 13, and the fourth control valve 90 is disconnected from the cold water inlet 14, such that the first control valve 60 is in communication with the second control valve 70, and the third control valve 80 is in communication with the fourth control valve 90.

That is, the cold water between the hot water outlet 12 and the hot water end 40 passes through the first check valve 50, the fourth control valve 90, the third control valve 80, the circulating pump 180, the heat exchange inlet 21, the heat exchange outlet 22, the first control valve 60, the second control valve 70 and the hot water end 40 in sequence, so as to complete the whole second zero-cold water system, and achieve the effect that the hot water end 40 can be heated immediately.

In an alternative embodiment, with continued reference to fig. 1, a second one-way valve 100 is provided between the first control valve 60 and the hot water inlet 11 to prevent backflow of hot water; a third one-way valve 110 is arranged between the second control valve 70 and the hot water outlet 12, so that hot water is prevented from flowing back into the water tank, and the normal use of the hot water system is prevented from being influenced; a fourth check valve 120 is arranged between the third control valve 80 and the cold water outlet 13, so that the cold water can only flow to the heat exchange inlet 21 along the cold water outlet 13; a fifth one-way valve 130 is provided between the fourth control valve 90 and the cold water inlet 14 so that cold water can only flow along the cold water side to the cold water inlet.

As an alternative embodiment of the water tank 10, with continued reference to fig. 1, the water tank 10 has therein a first water pipe 140 connected to the hot water inlet 11, a second water pipe 150 connected to the hot water outlet 12, a third water pipe 160 connected to the cold water outlet 13, and a fourth water pipe 170 connected to the cold water inlet 14; wherein, the first water pipe 140 and the second water pipe 150 extend to the top of the water tank 10, the third water pipe 160 and the fourth water pipe 170 are positioned at the bottom of the water tank 10, the first water pipe 140 is higher than the second water pipe 150, and the third water pipe 160 is lower than the fourth water pipe 170.

In the first working state and the first zero cold water state, hot water enters from the first water pipe 140 and exits from the second water pipe 150, and since the height difference between the first water pipe 140 and the second water pipe 150 is smaller than the height difference between the first water pipe 140 and the fourth water pipe 170, the water flow disturbance and the rotating vortex generated at the positions of the first water pipe 140 and the second water pipe 150 are smaller than the water flow disturbance caused by the fact that cold water enters from the fourth water pipe 170 and hot water exits from the second water pipe 150, and the temperature stratification in the water tank 10 is slowed down.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.