A water heater

Abstract

The present invention relates to the technical field of water heaters, and specifically provides a water heater, comprising: a first heat exchanger, the inlet end of which is connected to a first return water pipe, and the outlet end of which is connected to a first water outlet pipe; a first flow controller, the inlet end of which is connected to the first water outlet pipe, and one outlet end of which is connected to the first return water pipe and is in communication with a heating circuit; a second heat exchanger, the inlet end of which is connected to the other outlet end of the first flow controller; a second flow controller, the inlet end of which is connected to the outlet end of the second heat exchanger, one outlet end of which is connected to a pipeline where one outlet end of the first flow controller is in communication with the heating circuit, and the other outlet end of which is connected to a domestic hot water heat exchange system, and the outlet end of the domestic hot water heat exchange system is connected to a pipeline where the other outlet end of the first flow controller is in communication with the second heat exchanger. The water heater of the present invention can realize the simultaneous operation of heating and domestic hot water, and has higher utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and particularly to a water heater. Background Art

[0002] A water heater is a commonly used heat exchange device. Taking a domestic gas wall-mounted boiler as an example, existing families mostly use a wall-mounted boiler that can be used for both domestic hot water and heating hot water. Although this kind of wall-mounted boiler can provide the functions of heating hot water and domestic hot water, it cannot provide heating hot water and domestic hot water at the same time. That is to say, when heating is enabled, the water heated in the main heat exchanger enters the heating circulation system, and at this time, domestic hot water cannot be produced. When domestic hot water is started, to ensure the priority supply of domestic hot water, the water heated in the main heat exchanger enters the domestic hot water circulation system, resulting in the disconnection of the heating system. For families with many members in winter, due to the frequent use of the hot water function for a long time, the room temperature often drops significantly, greatly affecting the comfort.

[0003] To solve the above problems, a wall-mounted boiler with a dual combustion system is provided in the prior art. This kind of wall-mounted boiler is internally provided with two combustion systems for hot water combustion and heating combustion. Users can separately turn on one set or both sets of combustion systems according to needs, so as to realize the simultaneous use of domestic hot water and heating. However, the two systems of this kind of wall-mounted boiler are independent of each other. When users only use one of the functions, the system of the other function completely shuts down. For example, when only the heating function is turned on, the domestic hot water system is in a long-term idle waste state, resulting in low utilization rate of the wall-mounted boiler. Summary of the Invention

[0004] To solve the technical problem of the low utilization rate of the existing wall-mounted boiler with a dual combustion system, the present invention provides a water heater that can supply heating and domestic hot water with higher utilization rate.

[0005] A water heater provided by the present invention includes:

[0006] A first heat exchanger, the inlet end of which is connected to the first return pipe, and the outlet end of which is connected to the first outlet pipe;

[0007] A first flow controller, the inlet end of which is connected to the first outlet pipe, and one outlet end of which is connected to the heating circuit together with the first return pipe;

[0008] A second heat exchanger, the inlet end of which is connected to the other outlet end of the first flow controller;

[0009] The second flow controller has its inlet end connected to the outlet end of the second heat exchanger. One of its outlet ends is connected to the pipeline where one of the outlet ends of the first flow controller is connected to the heating circuit, and the other outlet end is connected to the domestic hot water heat exchange system. The outlet end of the domestic hot water heat exchange system is connected to the pipeline where the other outlet end of the first flow controller is connected to the second heat exchanger.

[0010] In some embodiments, the domestic hot water heat exchange system includes:

[0011] A third heat exchanger, with its first medium inlet end connected to the other outlet end of the second flow controller, its first medium outlet end connected to the pipeline where the other outlet end of the first flow controller is connected to the second heat exchanger, and its second medium inlet end and second medium outlet end connected to the domestic hot water pipeline.

[0012] In some embodiments, the hot water boiler further includes:

[0013] A first circulation pump, provided on the first return pipe; and

[0014] A second circulation pump, provided on the pipeline connecting the inlet end of the second heat exchanger to the first medium outlet end and the first flow controller.

[0015] In some embodiments, the first flow controller and the second flow controller are three-way valves.

[0016] In some embodiments, both the first heat exchanger and the second heat exchanger are gas heaters. The first heat exchanger includes a first gas valve and a first burner with a gas path connection, and the second heat exchanger includes a second gas valve and a second burner with a gas path connection. The inlet ends of the first gas valve and the second gas valve are connected to the gas supply pipeline.

[0017] In some embodiments, the hot water boiler further includes a blower and a smoke hood provided above the first heat exchanger and the second heat exchanger.

[0018] In some embodiments, the third heat exchanger is a plate heat exchanger.

[0019] In some embodiments, the hot water boiler further includes:

[0020] A first temperature sensor, provided on the pipeline connecting the first heat exchanger to the first flow controller.

[0021] In some embodiments, the hot water boiler further includes:

[0022] A second temperature sensor, provided on the pipeline connecting the second heat exchanger to the second flow controller; and

[0023] A third temperature sensor is disposed on the first return water pipe.

[0024] In some embodiments, the second medium inlet end is connected to a domestic water supply pipeline, and the second medium outlet end is connected to the end of domestic water use.

[0025] The water heater provided by the present invention includes a first heat exchanger and a second heat exchanger. Through two heat exchange systems, simultaneous use of heating and domestic hot water is achieved. The inlet end of the first heat exchanger is connected to the first return water pipe, the outlet end is connected to the first outlet water pipe, the inlet end of the first flow controller is connected to the first outlet water pipe, one of its outlet ends and the first return water pipe are connected to the heating circuit, and the other outlet end is connected to the inlet end of the second heat exchanger. The inlet end of the second flow controller is connected to the outlet end of the second heat exchanger, one of its outlet ends is connected to the pipeline where one outlet end of the first flow controller is connected to the heating circuit, and the other outlet end is connected to the domestic water heat exchange system. The outlet end of the domestic water heat exchange system is connected to the pipeline where the other outlet end of the first flow controller is connected to the second heat exchanger. By connecting the two heat exchange systems through the first flow controller and the second flow controller, the two heat exchangers can simultaneously participate in the heat exchange of the heating system, avoiding long-term idleness of the system, improving the utilization rate, and at the same time increasing the heating power and heat exchange effect of the heating system. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a water heater according to some embodiments of the present invention.

[0028] Description of the Reference Numerals:

[0029] 1 - First return water pipe; 2 - First outlet water pipe; 10 - First heat exchanger; 11 - First gas valve; 12 - First burner; 20 - Second heat exchanger; 21 - Second gas valve; 22 - Second burner; 30 - Third heat exchanger; 31 - First medium inlet end; 32 - First medium outlet end; 33 - Second medium inlet end; 34 - Second medium outlet end; 40 - First flow controller; 50 - Second flow controller; 60 - First circulation pump; 70 - Second circulation pump; 71 - First temperature sensor; 72 - Second temperature sensor; 73 - Third temperature sensor; 80 - Smoke hood; 90 - Fan. Detailed Embodiments

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts belong to the scope of protection of the present invention. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] The water heater provided by the present invention can be used in water heater heat exchange equipment, such as domestic wall-mounted boilers, heating furnaces, etc., and can realize the simultaneous supply of heating and domestic hot water. Figure 1 The structure of the water heater in some embodiments according to the present invention is shown.

[0032] As Figure 1 shown, in some embodiments, the water heater provided by the present invention includes a first heat exchanger 10, a second heat exchanger 20, a domestic water heat exchange system, a circulation pipeline, etc. The first heat exchanger 10 and the second heat exchanger 20 serve as the main heat exchangers of the dual-system water heater and provide heat for the circulating water of the water heater. In Figure 1 the shown some embodiments, both the first heat exchanger 10 and the second heat exchanger 20 adopt gas heaters. The first heat exchanger 10 includes a first gas valve 11 and a first burner 12 with gas paths connected. The second heat exchanger 20 includes a second gas valve 21 and a second burner 22 with gas paths connected. The first gas valve 11 and the second gas valve 21 can adopt existing gas proportional valves. The inlet ends of the first gas valve 11 and the second gas valve 21 are connected to the gas supply pipeline, and the outlet ends are respectively connected to the first burner 12 and the second burner 22. The gas proportional valve can control the intake ratio and flow rate of natural gas and air, thereby providing different combustion powers. The first burner 12 and the second burner 22 adopt a combustion fire row composed of several fire holes, and different combustion powers can also be achieved by controlling the number of burning fire rows. In some embodiments, a smoke collecting hood 80 and a fan 90 are provided above the first heat exchanger 10 and the second heat exchanger 20 to discharge the flue gas generated after combustion.

[0033] The inlet end of the first heat exchanger 10 is connected to the first return water pipe 1, and its outlet end is connected to the first water outlet pipe 2. The other end of the first water outlet pipe 2 is connected to the first flow controller 40. The first flow controller 40 is adapted to divide the water flowing into the first water outlet pipe 2 into two paths and respectively control the flow rate or on / off of the two outlet ends. One of the outlet ends of the first flow controller 40 and the first return water pipe 1 are connected to the heating circuit. Thus, the circulating water flows into the first heat exchanger 10 through the first return water pipe 1, is heated and then flows out from the first water outlet pipe 2. The heated high-temperature water enters the heating circuit through one of the outlet ends of the first flow controller 40, and the low-temperature water after heat exchange with the indoor environment flows back to the first return water pipe 1 to participate in the next cycle, thereby realizing a complete heating cycle.

[0034] The inlet end of the second heat exchanger 20 is connected to the other outlet end of the first flow controller 40, and the outlet end of the second heat exchanger 20 is connected to the inlet end of the second flow controller 50. The second flow controller 50 is adapted to divide the high-temperature water flowing out of the second heat exchanger 20 into two paths and control the flow rate or on / off of the two outlet ends. One of the outlet ends of the second flow controller 50 is connected to the pipeline where one of the outlet ends of the first flow controller 40 is connected to the heating circuit, that is, the high-temperature water flowing out of one of the outlet ends of the second flow controller 50 enters the heating circuit to participate in the heating heat exchange. And the other outlet end of the second flow controller 50 is connected to the domestic water heat exchange system, so that the high-temperature water flowing out of the other outlet end of the second flow controller 50 enters the domestic water heat exchange system to provide heat exchange for the bathroom.

[0035] As Figure 1 shown, the domestic water heat exchange system includes a third heat exchanger 30. The inlet end of the third heat exchanger 30 is connected to the other outlet end of the second flow controller 50, and the outlet end of the third heat exchanger 30 is connected to the pipeline where the first flow controller 40 is connected to the second heat exchanger 20, thereby forming a domestic water heat exchange cycle. In this embodiment, the third heat exchanger 30 is a plate heat exchanger. The first medium inlet end 31 of the plate heat exchanger is connected to the other outlet end of the second flow controller 50, the first medium outlet end 32 is connected to the other outlet end of the first flow controller 40, the second medium inlet end 33 is connected to 33, and the second medium outlet end 34 is connected to the pipeline of domestic water. For example, the second medium inlet end 33 is connected to the tap water supply pipe, and the second medium outlet end 34 is connected to the end of hot water use.

[0036] In some embodiments, the first flow controller 40 and the second flow controller 50 adopt a three-way valve structure, such as an electric three-way regulating valve. It should be noted that in some other embodiments, the first flow controller 40 and the second flow controller 50 can also adopt any other elements or components suitable for achieving flow splitting. For example, the first flow controller 40 can also adopt two electric two-way valves, which are respectively arranged on two branch paths and control the flow rate or on-off of each branch path. The same applies to the second flow controller 50, and the present invention does not limit this.

[0037] As Figure 1 shown, in some embodiments, the water heater further includes a first circulation pump 60 and a second circulation pump 70. The first circulation pump 60 is arranged on the pipeline of the first return water pipe 1, and the first circulation pump 60 provides power for the circulation pipeline of the first heat exchanger 10. The second circulation pump 70 is arranged on the pipeline where the first flow controller 40 communicates with the second heat exchanger 20. Its inflow end is respectively communicated with the first medium outlet end 32 and an outlet end of the first flow controller 40, and the outflow end is communicated with the inlet end of the second heat exchanger 20, so as to provide power for the circulation pipeline of the second heat exchanger 20.

[0038] In some embodiments, the water heater of the present invention further includes a first temperature sensor 71, a second temperature sensor 72 and a third temperature sensor 73. The first temperature sensor 71 is arranged on the pipeline where the first heat exchanger 10 communicates with the first flow controller 40, so as to detect the water temperature after being heated by the first heat exchanger 10. The second temperature sensor 72 is arranged on the pipeline where the second heat exchanger 20 communicates with the second flow controller 50, so as to detect the water temperature after being heated by the second heat exchanger 20. The third temperature sensor 73 is arranged on the first return water pipe 1, so as to detect the return water temperature.

[0039] The above describes the structure of the water heater of the present invention. On the basis of the above embodiments, the water heater of the present invention can also have other alternative embodiments. In some alternative embodiments, the first heat exchanger 10 and the second heat exchanger 20 are not limited to gas heaters, and any other suitable devices can also be used. For example, the first heat exchanger 10 and the second heat exchanger 20 can also adopt electric heating devices, and the third heat exchanger 30 can also adopt other forms of heat exchange equipment. The present invention does not limit this.

[0040] The above describes the structure of the water heater in some embodiments of the present invention. Next, in combination with Figure 1 the working principle of the water heater of the present invention will be described.

[0041] When the water heater uses only the heating function, it can be divided into single combustion system operation and dual combustion system operation. When operating in the single combustion system, the water heater provides heating with a lower power for the heating circuit. When operating in the dual combustion system, the water heater provides heating with a higher power for the heating circuit. When operating in the single combustion system, the first flow controller 40 is controlled to connect the outlet end of the second heat exchanger 20 and disconnect, and the second gas valve 21 is disconnected. The gas enters the first burner 12 through the first gas valve 11 for combustion heating. The first circulation pump 60 operates. The heating return water enters the first heat exchanger 10 through the first return pipe 1 for heating. The heated high-temperature water flows out through the first outlet pipe 2, enters the heating circuit after flowing through the first flow controller 40, provides heat exchange for environmental heating, and the heating water after heat exchange flows back to the first return pipe 1, thus forming a heating cycle. When the single combustion system cannot meet the heating demand, the dual combustion system is used for heating. When operating in the dual combustion system, the first circulation pump 60 and the second circulation pump 70 operate simultaneously. The first gas valve 11 and the second gas valve 21 are both in the connected state. At this time, the first burner 12 and the second burner 22 burn and heat simultaneously. The outlet end of the first flow controller 40 connected to the heating circuit is disconnected, and the outlet end connected to the second heat exchanger 20 is connected. The outlet end of the second flow controller 50 connected to the third heat exchanger 30 is disconnected, and the outlet end connected to the heating circuit is connected. At this time, the heating return water enters the first heat exchanger 10 through the first return pipe 1 for heating. The heated high-temperature water enters the second heat exchanger 20 through the first flow controller 40 for secondary heating. The high-temperature water after secondary heating flows into the heating circuit through the second flow controller 50, provides heat exchange with a greater power for environmental heating, and the heating water after heat exchange flows back to the first return pipe 1, thus forming a high-power heating cycle. It can be seen that without using the domestic hot water function, the water heater of the present invention can link the domestic hot water system and the heating system, supply heat for heating at the same time, avoid the long-term idle of the domestic hot water system, improve the resource utilization rate, and provide a heating effect with a greater power.

[0042] When the water heater provides domestic hot water and heating functions simultaneously, the outlet end where the first flow controller 40 is connected to the second heat exchanger 20 is disconnected, and the outlet end connected to the heating circuit is connected. The outlet end where the second flow controller 50 is connected to the heating circuit is disconnected, and the outlet end connected to the third heat exchanger 30 is connected. Both the first gas valve 11 and the second gas valve 21 are in the connected state. At this time, the first burner 12 and the second burner 22 burn and heat simultaneously, and the first circulation pump 60 and the second circulation pump 70 work simultaneously. At this time, the heating return water enters the first heat exchanger 10 through the first return pipe 1 for heating. The heated high-temperature water enters the heating circuit through the first flow controller 40 to provide heat exchange for environmental heating. After the heat exchange is completed, the heating return water flows into the first return pipe 1 to complete the heating heat exchange cycle. The second circulation pump 70 provides power for the pipeline. The domestic circulating water enters the second heat exchanger 20 through the second circulation pump 70 for heating. The heated high-temperature water enters the first medium inlet end 31 of the third heat exchanger 30 through the second flow controller 50, and then after completing the heat exchange in the third heat exchanger 30, it flows back to the inlet end of the second circulation pump 70 through the first medium outlet end 32 to complete the domestic hot water heat exchange cycle. The low-temperature tap water enters the third heat exchanger 30 through the second medium inlet end 33, and after completing the heat exchange with the high-temperature circulating water in the heat exchanger, it flows into the end of the domestic hot water, such as bathing, kitchen hot water, etc.

[0043] When the water heater only provides the domestic hot water function, the outlet end where the first flow controller 40 is connected to the heating circuit, the outlet end where the second flow controller 50 is connected to the heating circuit, and the first gas valve 11 are all in the disconnected state. Its working principle is the same as the above, and will not be elaborated here.

[0044] The structure and working principle of the water heater in some embodiments of the present invention are described above. In some embodiments, the water heater of the present invention may further include a controller, which is connected to a temperature sensor, a flow controller, and a gas valve, and can control different working modes of the water heater by collecting the sensor temperature. For example, in one embodiment, when providing the heating function, by obtaining the water temperature collected by the first temperature sensor 71, it is judged whether the water temperature is within the preset temperature range. When the water temperature is less than the preset temperature range, the controller controls the on-off of the first flow controller 40 and the second flow controller 50 to switch the water heater to the dual combustion system mode. When the water temperature is greater than the preset temperature range, the controller controls the on-off of the first flow controller 40 and the second flow controller 50 to switch the water heater to the single combustion system mode. It should be noted that the connection relationship and control principle described in this embodiment can adopt conventional settings. Those skilled in the art can implement the technical solution of this embodiment based on the above disclosure, and will not be elaborated here.

[0045] Obviously, the above-described embodiments are merely examples for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A water heater, characterized in that, Comprising: A first heat exchanger (10) with its inlet end connected to the first return water pipe (1) and its outlet end connected to the first outlet water pipe (2); A first flow controller (40) with its inlet end connected to the first outlet water pipe (2), and one of its outlet ends and the first return water pipe (1) being connected to the heating circuit; A second heat exchanger (20) with its inlet end connected to the other outlet end of the first flow controller (40); A second flow controller (50) with its inlet end connected to the outlet end of the second heat exchanger (20), one of its outlet ends being connected to the pipeline where one of the outlet ends of the first flow controller (40) is connected to the heating circuit, and the other outlet end being connected to the domestic hot water heat exchange system. The outlet end of the domestic hot water heat exchange system is connected to the pipeline where the other outlet end of the first flow controller (40) is connected to the second heat exchanger (20). The domestic hot water heat exchange system includes a third heat exchanger (30), with its first medium inlet end (31) connected to the other outlet end of the second flow controller (50), its first medium outlet end (32) connected to the pipeline where the other outlet end of the first flow controller (40) is connected to the second heat exchanger (20), and its second medium inlet end (33) and second medium outlet end (34) being connected to the domestic hot water pipeline; A first circulation pump (60) provided on the first return water pipe (1); A second circulation pump (70) with its inlet end connected to the first medium outlet end (32) and one of the outlet ends of the first flow controller (40) respectively, and its outlet end connected to the inlet end of the second heat exchanger (20); When the single combustion system cannot meet the heating demand, a dual combustion system is adopted for heating. When the dual combustion system is working, the first circulation pump (60) and the second circulation pump (70) work simultaneously. The heating return water enters the first heat exchanger (10) through the first return water pipe (1) for heating. The heated high-temperature water enters the second heat exchanger (20) through the first flow controller (40) for secondary heating. The high-temperature water after secondary heating flows into the heating circuit through the second flow controller (50).

2. The water heater according to claim 1, wherein The first flow controller (40) and the second flow controller (50) are three-way valves.

3. The water heater according to claim 1, wherein The first heat exchanger (10) and the second heat exchanger (20) are both gas heaters. The first heat exchanger (10) includes a first gas valve (11) and a first burner (12) with their gas paths connected. The second heat exchanger (20) includes a second gas valve (21) and a second burner (22) with their gas paths connected. The inlet ends of the first gas valve (11) and the second gas valve (21) are connected to the gas supply pipeline.

4. The water heater according to claim 3, wherein It further includes a blower (90) and a smoke hood (80) provided above the first heat exchanger (10) and the second heat exchanger (20).

5. The water heater according to claim 1, wherein The third heat exchanger (30) is a plate heat exchanger.

6. The water heater according to claim 1, characterized in that, It further includes: A first temperature sensor (71) provided on the pipeline where the first heat exchanger (10) communicates with the first flow divider controller (40).

7. The water heater according to claim 5, characterized in that, It further includes: A second temperature sensor (72) provided on the pipeline where the second heat exchanger (20) communicates with the second flow divider controller (50); and A third temperature sensor (73) provided on the first return water pipe (1).

8. The water heater according to claim 1, wherein The second medium inlet end (33) communicates with the domestic water supply pipeline, and the second medium outlet end (34) communicates with the end of domestic water use.

Images