CN212205039U

CN212205039U - Water heater

Info

Publication number: CN212205039U
Application number: CN202020782773.0U
Authority: CN
Inventors: 王国芳
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2020-12-22
Anticipated expiration: 2030-05-12

Abstract

The utility model relates to a water heater, which comprises a burner, a heat exchanger, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively communicated with the inlet end and the outlet end of the heat exchanger; the water heater also comprises a bypass pipe and a proportional valve, wherein two ends of the bypass pipe are respectively communicated with the water inlet pipe and the water outlet pipe, and the proportional valve is assembled on the bypass pipe; when the water consumption point is detected to have an input signal, the water inlet pipe is communicated with a water source, and the proportional valve controllably adjusts the proportion of cold water flowing from the water inlet pipe to the water outlet pipe, so that the temperature of outlet water from the water outlet pipe is kept constant. When a user uses water, the proportional valve controllably adjusts the proportion of cold water flowing from the water inlet pipe to the water outlet pipe, so that the cold water and the hot water are neutralized to adjust the water outlet temperature of the water outlet pipe, the temperature flowing out of the water outlet pipe is kept constant, and the phenomenon of sudden cooling and sudden heating during water use is reduced.

Description

Water heater

Technical Field

The utility model relates to a indirect heating equipment technical field especially relates to a water heater.

Background

With the development of economy and the progress of society, water heaters appear in daily life of people. The water heater is a device which increases the temperature of cold water into hot water within a certain time by various physical principles, and can be divided into an electric water heater, a gas water heater, a solar water heater, a magnetic water heater, an air water heater, a heating water heater and the like according to different principles. Among them, the gas water heater is widely used in daily life of people.

The gas water heater is also called as a gas water heater, and refers to a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a fuel heating mode so as to achieve the purpose of preparing hot water.

However, because the water pressure used at home is constantly changing dynamically, that is, the water pressure of the inlet water of the gas water heater is constantly changing dynamically under the condition that the combustion power is kept unchanged, the water temperature of a user is changed when the user uses the gas water heater, and the phenomenon that the outlet water temperature is suddenly cold and suddenly hot occurs.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a water heater capable of keeping the temperature of the outlet water constant, aiming at the problem of the temperature of the outlet water being suddenly cold and hot when using the traditional gas water heater.

A water heater comprises a burner, a heat exchanger, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively communicated with an inlet end and an outlet end of the heat exchanger;

the water heater also comprises a bypass pipe and a proportional valve, wherein two ends of the bypass pipe are respectively communicated with the water inlet pipe and the water outlet pipe, and the proportional valve is assembled on the bypass pipe;

when the water consumption point is detected to have an input signal, the water inlet pipe is communicated with a water source, and the proportional valve controllably adjusts the proportion of cold water flowing from the water inlet pipe to the water outlet pipe, so that the temperature of outlet water from the water outlet pipe is kept constant.

In one embodiment, the water heater further comprises a water storage tank, the water storage tank is communicated with the water outlet pipe, and the water outlet pipe is communicated with the bypass pipe through the water storage tank;

when the water consumption point is detected not to have an input signal and the temperature of the water in the water storage tank is smaller than a first preset threshold value, the water inlet pipe is disconnected from the water source, and the burner works to exchange heat with the heat exchanger.

In one embodiment, the water heater further comprises a first communication pipe and a one-way valve, wherein two ends of the first communication pipe are respectively communicated with the water inlet pipe and the water outlet pipe, and the one-way valve is mounted on the first communication pipe and used for limiting water from flowing from one end of the first communication pipe communicated with the water inlet pipe to one end of the first communication pipe communicated with the water outlet pipe; the communication position of the first communication pipe and the water outlet pipe is positioned on one side of the water storage tank, which is far away from the heat exchanger;

wherein when it is detected that the water usage point has no input signal and the temperature of the water in the storage tank is less than a first preset threshold, the proportional valve controllably adjusts the resistance of the water in the bypass pipe to circulate the water between the storage tank, the bypass pipe and the heat exchanger.

In one embodiment, when it is detected that the water usage point has no input signal and the temperature of the water in the storage tank is greater than or equal to the first preset threshold, the proportional valve controllably adjusts the resistance of the water in the bypass pipe to circulate the water between the storage tank, the first communication pipe and the bypass pipe.

In one embodiment, the communication between the first communication pipe and the water inlet pipe is located on the side of the communication between the bypass pipe and the water inlet pipe, which is far away from the heat exchanger.

In one embodiment, the outlet pipe has an outlet end, and the first communication pipe is communicated with the outlet end of the outlet pipe.

In one embodiment, the water heater further comprises a first temperature sensor for detecting the temperature of the water in the water outlet pipe, and when the water consumption point is detected to have an input signal, the proportional valve controllably adjusts the proportion of the cold water flowing to the water outlet pipe according to the difference between the temperature of the water in the water outlet pipe and a preset temperature.

In one embodiment, the water outlet pipe has a water outlet end, and the heat exchanger further includes a second communication pipe, and two ends of the second communication pipe are respectively communicated with the water outlet end of the water outlet pipe and the water inlet pipe.

In one embodiment, the water heater further comprises a water pump mounted on the water inlet pipe or the water outlet pipe.

In one embodiment, the water heater further comprises a controller, and the burner and the proportional valve are both electrically connected to the controller.

A control method of a water heater, comprising:

when the water consumption point is detected to have an input signal, controlling the work of the burner and the communication of the water inlet pipe and the water source;

and controlling the proportional valve to adjust the proportion of cold water flowing from the water inlet pipe to the water outlet pipe so as to keep the temperature of the water outlet from the water outlet pipe constant.

In one embodiment of the present invention,

when the water consumption point is detected to have no input signal and the temperature of the water in the water storage tank is larger than or equal to a first preset threshold value, controlling the combustor to stop working and the water inlet pipe to be disconnected from a water source;

and controlling water to flow among the water storage tank, the bypass pipe and the first communication pipe.

In one embodiment of the present invention,

when the water consumption point is detected to have no input signal and the temperature of the water in the water storage tank is smaller than a first preset threshold value, controlling the burner to work and disconnecting the water inlet pipe from a water source;

controlling water flow among the water storage tank, the bypass pipe and the heat exchanger.

In one embodiment of the present invention,

and when the water consumption point is detected not to have an input signal and the water level in the water storage tank is lower than a second preset threshold value, controlling the water inlet pipe to be communicated with a water source.

In one embodiment, when the time length for detecting that the water consumption point has no input signal is greater than a third preset threshold value, the water heater is controlled to be in a standby state.

According to the water heater and the control method thereof, when a user uses water, the proportion of cold water flowing from the water inlet pipe to the water outlet pipe can be controllably adjusted through the proportional valve, the cold water and the hot water are neutralized to adjust the water outlet temperature of the water outlet pipe, the temperature flowing out of the water outlet pipe is kept constant, and the phenomenon of sudden cooling and sudden heating during water use is reduced.

Drawings

Fig. 1 is a schematic diagram of a water heater according to an embodiment of the present invention;

fig. 2 is a flowchart of a control method of a water heater according to another embodiment of the present invention.

100. A water heater; 10. a burner; 11. a body; 12. an ignition needle; 13. fire detecting needles; 20. a heat exchanger; 30. a water inlet pipe; 40. a water outlet pipe; 41. a water outlet end; 50. a fan; 60. a bypass pipe; 70. a proportional valve; 80. a connecting pipe; 90. an on-off valve; 110. a water pump; 120. a header pipe; 130. a branch pipe; 140. a gas valve; 150. a segment valve; 160. a water storage tank; 170. a first communication pipe; 180. a one-way valve; 190. and a second communication pipe.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" 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," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, an embodiment of the present invention provides a water heater 100, including a burner 10, a heat exchanger 20, a water inlet pipe 30 and a water outlet pipe 40, the heat exchanger 20 has an inlet end and an outlet end that are communicated with each other, the water inlet pipe 30 is communicated with the inlet end of the heat exchanger 20, the water outlet pipe 40 is communicated with the outlet end of the heat exchanger 20, and the burner 10 is used for burning smoke generated and flowing in the heat exchanger 20 to exchange heat with water. When the water consumption point has an input signal, the water inlet pipe 30 is communicated with a water source, cold water in the water source flows to the water inlet pipe 30 and enters the heat exchanger 20 from the water inlet pipe 30 through the inlet end of the heat exchanger 20, smoke generated by the burner 10 exchanges heat with the cold water flowing in the heat exchanger 20, and hot water formed after heat exchange flows to the water consumption point from the water outlet pipe 40 for use.

The water heater 100 further comprises a fan 50, and the fan 50 rotates to discharge the flue gas after heat exchange with the heat exchanger 20 to the outside.

The water heater 100 further includes a bypass pipe 60 and a proportional valve 70, both ends of the bypass pipe 60 are respectively communicated with the water inlet pipe 30 and the water outlet pipe 40, and the proportional valve 70 is assembled on the bypass pipe 60. When the water usage point has an input signal, the inlet pipe 30 is connected to a water source, and the proportional valve 70 controllably adjusts the proportion of cold water flowing from the inlet pipe 30 to the outlet pipe 40 to maintain a constant outlet water temperature from the outlet pipe 40.

The embodiment of the utility model provides a water heater 100, the both ends of bypass pipe 60 communicate with inlet tube 30 and outlet pipe 40 respectively, assemble proportional valve 70 on the bypass pipe 60. When the user uses water (when the water using point has an input signal), the proportional valve 70 will controllably adjust the proportion of the cold water flowing from the water inlet pipe 30 to the water outlet pipe 40, so as to neutralize the cold water with the hot water and adjust the temperature of the water flowing out from the water outlet pipe 40, so that the temperature flowing out from the water outlet pipe 40 is kept constant, and the phenomenon of sudden cold and sudden heat when the user uses water is reduced.

The water heater 100 further includes a controller, the burner 10 and the proportional valve 70 are electrically connected to the controller, and the controller controls the operation of the burner 10 and the proportional valve 70.

Further, the water heater 100 further comprises a connecting pipe 80 and a switch valve 90, wherein the connecting pipe 80 is connected with the water inlet pipe 30, and the switch valve 90 is assembled on the connecting pipe 80 and used for controlling the on-off of the water inlet pipe 30 and a water source. Specifically, the switch valve 90 is an electric switch valve 90, the switch valve 90 is electrically connected with a controller, and the controller controls the switch valve 90 to be opened or closed so as to control the on-off between the water inlet pipe 30 and the water source.

The water heater 100 further includes a water pump 110, the water pump 110 being mounted on the inlet pipe 30 or the outlet pipe 40 to provide pressure for the water to flow in the pipes and the heat exchanger 20. In one embodiment, the water pump 110 is mounted to the water inlet pipe 30. It should be understood that in other embodiments, the water pump 110 may also be mounted on the water outlet pipe 40, and is not limited thereto.

Specifically, the water heater 100 further includes a manifold 120, a plurality of branch pipes 130, a gas valve 140, and a segment valve 150. One end of the main pipe 120 is communicated with a gas source, the gas valve 140 is mounted on the main pipe 120, the segment valve 150 is communicated with the other end of the main pipe 120, one end of each branch pipe 130 is communicated with the segment valve 150, and the other end of each branch pipe 130 is communicated with the burner 10. When the water consumption point has an input signal, the gas valve 140 and the segment valve 150 are both opened, and gas enters the corresponding combustion segment of the combustor 10 from each branch pipe 130 to be combusted to generate high-temperature flue gas.

The burner 10 comprises a body 11, an ignition needle 12 and a fire detection needle 13, wherein the ignition needle 12 and the fire detection needle 13 are both connected to the body 11, the ignition needle 12 discharges, fuel gas is ignited and starts to burn to generate flame, and the ignition needle 12 stops discharging after the fire detection needle 13 detects a flame signal. Specifically, the body 11 is divided into a plurality of combustion sections, and the ignition needle 12 and the fire detection needle 13 are mounted on the combustion sections which are relatively close to each other. It is understood that the assembling positions of the ignition needle 12 and the ignition needle 13 are not limited in other embodiments.

The inventor researches and discovers that the time for heating cold water to a convenient temperature by the water heater 100 is generally ten seconds or more, if the water consumption point is far away from the water heater 100, the cold water in the pipeline needs to be discharged before the hot water flows out when the hot water is used, and the waiting time is longer, so that the user experience is reduced, and the resource waste is caused.

In order to solve the above problem, the water heater 100 further includes a water storage tank 160, the water storage tank 160 is communicated with the water outlet pipe 40, and the water outlet pipe 40 is communicated with the bypass pipe 60 through the water storage tank 160.

When the water consumption point has an input signal, the controller controls the switch valve 90 to be opened, the water inlet pipe 30 is communicated with the water source, cold water in the water source flows to the water inlet pipe 30 under the action of the water pump 110, enters the heat exchanger 20 through the inlet end of the heat exchanger 20 through the water inlet pipe 30, smoke generated by the burner 10 exchanges heat with the cold water flowing in the heat exchanger 20, hot water formed after heat exchange flows to the water storage tank 160, and then flows to the water consumption point from the water outlet end 41 of the water outlet pipe 40 for use. And because the water outlet pipe 40 is communicated with the bypass pipe 60 through the water storage tank 160, the cold water in the water inlet pipe 30 enters the water storage tank 160 to be mixed with the hot water and then is discharged, and the water storage tank 160 can enable the cold water to be mixed with the hot water more uniformly.

When the water consumption point has no input signal and the temperature of the water in the water storage tank 160 is less than the first preset threshold value, the water inlet pipe 30 is disconnected from the water source, and the burner 10 operates to exchange heat with the heat exchanger 20. That is, when the user does not use water, the hot water is stored in the water storage tank 160 for the next use of the user, so that the waiting time for the next use of the hot water by the user is reduced, the user experience is increased, and the waste of resources is reduced.

Further, the water heater 100 further includes a first communicating pipe 170 and a check valve 180, two ends of the first communicating pipe 170 are respectively communicated with the water inlet pipe 30 and the water outlet pipe 40, and the check valve 180 is assembled on the first communicating pipe 170 for limiting water from flowing from one end of the first communicating pipe 170 communicated with the water inlet pipe 30 to one end thereof communicated with the water outlet pipe 40. Wherein, the communication position of the first communication pipe 170 and the water outlet pipe 40 is located at one side of the water storage tank 160 far away from the heat exchanger 20.

When the water consumption point is detected to have an input signal, the water inlet pipe 30 is communicated with a water source, cold water in the water source flows to the water inlet pipe 30 and enters the heat exchanger 20 through the inlet end of the heat exchanger 20 through the water inlet pipe 30, smoke generated by the burner 10 exchanges heat with cold water flowing in the heat exchanger 20 to form a hot water flow storage tank 160 after heat exchange, and then flows to the water consumption point from the water outlet end 41 of the water outlet pipe 40 for use. The hot water flowing out of the outlet pipe 40 does not flow back to the inlet pipe 30 due to the restriction of the check valve 180.

When it is detected that the water consumption point has no input signal and the temperature of the water in the water storage tank 160 is less than the first preset threshold value, the proportional valve 70 adjusts the resistance of the water in the bypass pipe 60 to make the water circularly flow among the water storage tank 160, the bypass pipe 60 and the heat exchanger 20, and at this time, the flue gas generated by the combustion of the burner 10 can exchange heat with the water flowing in the heat exchanger 20 to ensure that the water in the water storage tank 160 is at a proper temperature.

Further, when it is detected that the water consumption point has no input signal and the temperature of the water in the water storage tank 160 is greater than or equal to the first preset threshold value, the proportional valve 70 adjusts the resistance of the water in the bypass pipe 60 so as to make the water circularly flow among the water storage tank 160, the first communication pipe 170 and the bypass pipe 60, and under the condition that the water storage tank 160 has a proper temperature, the water does not flow through the heat exchanger 20 any more, so that the resistance encountered when the water flows is reduced, the heat dissipation is reduced, and the energy is saved.

Specifically, the water heater 100 further includes a second temperature sensor for sensing the temperature within the water storage tank 160.

In one embodiment, the communication between the first communication pipe 170 and the water inlet pipe 30 is located at the side of the communication between the bypass pipe 60 and the water inlet pipe 30, which is far away from the heat exchanger 20, and at this time, when the water consumption point has no input signal and the temperature of the water in the storage tank 160 is greater than or equal to a first preset threshold value, the proportional valve 70 adjusts the resistance of the water in the bypass pipe 60 so that the water circulates among the storage tank 160, the first communication pipe 170 and the bypass pipe 60 under the action of the water pump 110. It is understood that in other embodiments, the communication between the first communication pipe 170 and the water inlet pipe 30 may be located at a side of the connection between the bypass pipe 60 and the water inlet pipe 30, which is close to the heat exchanger 20, and is not limited herein.

Further, the water outlet pipe 40 has a water outlet end 41, and the first communication pipe 170 is communicated with the water outlet end 41 of the water outlet pipe 40, so that when the user does not use the water heater 100, since water circularly flows among the water storage tank 160, the first communication pipe 170 and the bypass pipe 60 or flows among the water storage tank 160, the first communication pipe 170 and the heat exchanger 20, it is ensured that hot water exists in the water outlet pipe 40 from the position connected with the water storage tank 160 to any position of the water outlet end 41 thereof, the effect of zero waiting can be achieved when the user uses the hot water next time, and the hot water flows out without waiting.

In one embodiment, the water heater 100 further includes a first temperature sensor for sensing the temperature of the water within the water pipe 40. When a water consumption point is detected to have an input signal, the proportional valve 70 controllably adjusts the proportion of cold water flowing to the outlet pipe 40 according to the difference between the temperature of the water in the outlet pipe 40 and a preset temperature. That is, the proportional valve 70 adjusts the resistance of the bypass pipe 60 according to the difference between the temperature of the water in the water outlet pipe 40 detected by the first temperature sensor and the preset temperature, so as to adjust the proportion of the cold water flowing from the water inlet pipe 30 to the water outlet pipe 40, thereby achieving the purpose of keeping the temperature of the water out of the water outlet pipe 40 constant.

It is understood that in other embodiments, the water heater 100 may also be provided with a pressure valve for detecting the pressure of the incoming water in the water inlet pipe 30. When the water consumption point is detected to have an input signal, the proportional valve 70 controllably adjusts the proportion of the cold water flowing to the water outlet pipe 40 according to the difference between the pressure in the water inlet pipe 30 and the preset pressure, which is not limited herein.

The water heater 100 further includes a second communication pipe 190, and two ends of the second communication pipe 190 are respectively communicated with the water outlet end 41 of the water outlet pipe 40 and the water inlet pipe 30. Thus, when the water consumption point is detected to have an input signal, that is, when the user consumes water, the controller controls the switch valve 90 to be opened, the water inlet pipe 30 is communicated with the water source, and because the second communication pipe 190 is communicated with the water inlet pipe 30, part of cold water can flow from the second communication pipe 190 to the water outlet end 41 of the water outlet pipe 40 to be mixed and then flow out. It is understood that in other embodiments, the second communicating pipe 190 may be omitted from the water heater 100.

In one embodiment, the first communicating pipe 170 and the second communicating pipe 190 have a common section, the first communicating pipe 170 has a first section, the second communicating pipe 190 has a second section, one end of the common section is communicated with the water inlet pipe 30, two ends of the first section are respectively communicated with the other end of the common section and the water outlet pipe 40, the check valve 180 is assembled on the first section, and two ends of the second section are respectively communicated with the other end of the common section and the water outlet end 41 of the water outlet pipe 40.

Referring to fig. 2, an embodiment of the present invention further provides a control method of the water heater 100, including:

s110: when the water consumption point is detected to have an input signal, the burner 10 is controlled to work and the water inlet pipe 30 is controlled to be communicated with a water source;

s120: the proportional valve 70 is controlled to adjust the proportion of cold water flowing from the inlet pipe 30 to the outlet pipe 40.

The embodiment of the utility model provides a control method of water heater 100, proportional valve 70 will controllably adjust the proportion that inlet tube 30 flows to the cold water of outlet pipe 40, make cold water and hot water in with the play water temperature of adjusting from outlet pipe 40 to the temperature that makes to flow from outlet pipe 40 keeps invariable, the phenomenon of suddenly cooling and suddenly heating that appears when having reduced the water.

In one embodiment, when it is detected that the water consumption point has no input signal and the temperature of the water in the water storage tank 160 is greater than or equal to a first preset threshold value, the burner 10 is controlled to stop working and the water inlet pipe 30 is controlled to be disconnected from the water source;

the flow of water is controlled between the storage tank 160, the bypass pipe 60, and the first communication pipe 170.

Through the arrangement, under the condition that the water storage tank 160 is ensured to have the proper temperature, water does not flow through the heat exchanger 20, so that the resistance encountered when the water flows is reduced, the heat dissipation of heat is reduced, and the energy is saved.

In another embodiment, when it is detected that the water consumption point has no input signal and the temperature of the water in the water storage tank 160 is less than the first preset threshold, the burner 10 is controlled to operate and the water inlet pipe 30 is disconnected from the water source;

controlling the flow of water between the storage tank 160, the bypass pipe 60 and the heat exchanger 20.

Through the above arrangement, the flue gas generated by the combustion of the burner 10 can exchange heat with the water flowing in the heat exchanger 20, so as to ensure that the water in the water storage tank 160 is at a proper temperature.

Specifically, the flow rate of the water flowing in the heat exchanger 20 is set to a flow rate corresponding to the burner 10 burning with minimum power, so as to avoid waste of resources.

Further, when it is detected that the water consumption point does not have an input signal and the water level in the water storage tank 160 is lower than a second preset threshold value, the water inlet pipe 30 is controlled to be communicated with the water source, so that a proper amount of water is ensured to be contained in the water storage tank 160.

Specifically, the water heater 100 includes a water level sensor, and the controller controls the water level sensor to detect the water level in the water storage tank 160.

In one embodiment, when the duration of time for detecting that the water consumption point has no input signal is greater than the third preset threshold, the water heater 100 is controlled to be in a standby state, so that the waste of resources is avoided. That is, the water heater 100 provided in this embodiment is suitable for the situation that the user temporarily turns off the water in the midway of using the water; when the time period for which the user no longer uses water is greater than the third preset threshold, the water heater 100 will be in a standby state, and the hot water with the proper temperature in the water storage tank 160 can no longer be guaranteed.

Specifically, the third preset threshold may be set as required, for example, the third preset threshold may be set to 10 to 20 minutes. Of course, in other embodiments, the setting of the third preset threshold is not limited.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The water heater is characterized by comprising a burner (10), a heat exchanger (20), a water inlet pipe (30) and a water outlet pipe (40), wherein the water inlet pipe (30) and the water outlet pipe (40) are respectively communicated with the inlet end and the outlet end of the heat exchanger (20), and the burner (10) is used for burning to generate flue gas which exchanges heat with water in the heat exchanger (20);

the water heater also comprises a bypass pipe (60) and a proportional valve (70), wherein two ends of the bypass pipe (60) are respectively communicated with the water inlet pipe (30) and the water outlet pipe (40), and the proportional valve (70) is assembled on the bypass pipe (60);

when the water consumption point is detected to have an input signal, the water inlet pipe (30) is communicated with a water source, and the proportional valve (70) controllably adjusts the proportion of cold water flowing from the water inlet pipe (30) to the water outlet pipe (40) so as to keep the temperature of outlet water from the water outlet pipe (40) constant.

2. The water heater according to claim 1, further comprising a storage tank (160), said storage tank (160) communicating with said outlet pipe (40), said outlet pipe (40) communicating with said bypass pipe (60) through said storage tank (160);

when it is detected that the water consumption point has no input signal and the temperature of the water in the water storage tank (160) is less than a first preset threshold value, the water inlet pipe (30) is disconnected from the water source and the burner (10) works to exchange heat with the heat exchanger (20).

3. The water heater according to claim 2, further comprising a first communication pipe (170) and a check valve (180), both ends of the first communication pipe (170) are respectively communicated with the water inlet pipe (30) and the water outlet pipe (40), the check valve (180) is mounted on the first communication pipe (170) for restricting water from flowing from one end of the first communication pipe (170) communicated with the water inlet pipe (30) to one end thereof communicated with the water outlet pipe (40); the communication position of the first communication pipe (170) and the water outlet pipe (40) is positioned on one side of the water storage tank (160) far away from the heat exchanger (20);

wherein, when it is detected that the water usage point has no input signal and the temperature of the water in the storage tank (160) is less than a first preset threshold, the proportional valve (70) controllably adjusts the resistance of the water in the bypass pipe (60) to circulate the water between the storage tank (160), the bypass pipe (60) and the heat exchanger (20).

4. A water heater according to claim 3, characterized in that when it is detected that the water usage point has no input signal and the temperature of the water inside the storage tank (160) is greater than or equal to the first preset threshold, the proportional valve (70) controllably adjusts the resistance of the water inside the bypass pipe (60) to circulate the water between the storage tank (160), the first connection pipe (170) and the bypass pipe (60).

5. A water heater according to claim 3, wherein the communication of the first communication pipe (170) with the inlet pipe (30) is at the side of the communication of the bypass pipe (60) with the inlet pipe (30) remote from the heat exchanger (20).

6. A water heater according to claim 3, wherein the outlet pipe (40) has an outlet end (41), the first communication pipe (170) communicating with the outlet end (41) of the outlet pipe (40).

7. The water heater according to claim 1, further comprising a first temperature sensor for sensing the temperature of the water in the outlet pipe (40), the proportional valve (70) controllably adjusting the proportion of cold water flowing to the outlet pipe (40) in dependence on the difference between the temperature of the water in the outlet pipe (40) and a preset temperature when a water usage point is sensed with an input signal.

8. The water heater according to claim 1, wherein the outlet pipe (40) has an outlet end (41), the heat exchanger (20) further comprises a second communication pipe (190), and two ends of the second communication pipe (190) are respectively communicated with the outlet end (41) of the outlet pipe (40) and the inlet pipe (30).

9. The water heater according to claim 1, further comprising a water pump (110), the water pump (110) being mounted on the water inlet pipe (30) or the water outlet pipe (40).

10. The water heater according to claim 1, further comprising a controller, the burner (10) and the proportional valve (70) both being electrically connected to the controller.