Water heater

Abstract

The water heater is applied to photovoltaic texturing equipment and comprises a first water tank, a second water tank, a circulating pipeline, a heating system and a water pump, second liquid is contained in the first water tank and the second water tank, and the first water tank comprises a first containing cavity and a first heat exchanger; the first heat exchanger is provided with an input port for receiving first liquid; the second water tank comprises a second containing cavity and a second heat exchanger, the second heat exchanger communicates with the first heat exchanger, the second heat exchanger is used for heating the first liquid subjected to primary heating, and the second heat exchanger is provided with an output port used for outputting the heated first liquid out of the water heater; the circulating pipeline communicates the first accommodating cavity with the second accommodating cavity; the heating system comprises a heat pump unit communicated with the circulating pipeline; the water pump is arranged on the circulating pipeline and used for pumping the second liquid into the heat pump unit. Through the arrangement, circulating heating of the liquid for heating is achieved, energy consumption is reduced, and the heating cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical equipment, in particular to a hot water machine. BACKGROUND

[0002] In the wet process of solar cell, many processes need high-temperature solution, on the one hand, high temperature can provide necessary conditions for the chemical reaction, on the other hand, the higher the temperature, the faster the reaction rate, reducing the process time required, hot water machine can effectively heat and maintain a high temperature of the solution.

[0003] The existing hot water machine commonly used in wet process includes thermal hot water machine and water bath hot water machine. The thermal hot water machine is a kind of hot water heater that can heat water immediately, and the water flowing through the high-power heating element directly contacts; the water bath hot water machine is a kind of hot water heater that uses water as a heat transfer medium, and the water flowing through the heat exchanger absorbs the heat of the water bath to heat up, and the heating rod is responsible for heating the water bath part. The power of the two kinds of hot water machines is large, the energy consumption is high, and the electricity cost is high. CONTENT OF THE INVENTION

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide a hot water machine, which reduces the heating cost and reduces the energy consumption of the hot water machine.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A hot water machine applied to a photovoltaic etching device, comprising: a first water tank, a second water tank, a circulation pipeline, a heating system and a water pump, the first water tank comprising a first containing cavity and a first heat exchanger arranged in the first containing cavity, the first heat exchanger having an input port for receiving a first liquid; the second water tank comprising a second containing cavity and a second heat exchanger arranged in the second containing cavity, the second heat exchanger being in communication with the first heat exchanger, the second heat exchanger being used for receiving the first liquid preliminarily heated by the first heat exchanger, the second heat exchanger having an output port for outputting the first liquid heated to completion from the second heat exchanger; the circulation pipeline is arranged between the first water tank and the second water tank, and connects the first containing cavity and the second containing cavity; the heating system comprises a heat pump unit in communication with the circulation pipeline; the water pump is connected with the circulation pipeline and is used for pumping a second liquid in the first water tank and / or the second water tank into the heat pump unit.

[0007] Further, the heating system further comprises a first heating mechanism and a second heating mechanism, the first heating mechanism is arranged in the first containing cavity and is arranged below the first heat exchanger, and the second heating mechanism is arranged in the second containing cavity and is arranged below the second heat exchanger.

[0008] Further, the first heat exchanger is suspended in the first accommodating cavity and is substantially located at a middle position of the first accommodating cavity; and the second heat exchanger is suspended in the second accommodating cavity and is substantially located at a middle position of the second accommodating cavity.

[0009] Further, the circulating pipeline comprises a first pipeline and a second pipeline, the heat pump unit is provided with a water inlet connected with the first pipeline and a water outlet connected with the second pipeline, and the water pump is arranged between the water inlet and at least part of the first pipeline, wherein the first water tank and the second water tank form a water tank group, and the first pipeline and the second pipeline are arranged on opposite sides of the water tank group respectively.

[0010] Further, the heating system comprises a temperature measuring unit and a protection unit, at least part of the temperature measuring unit and at least part of the protection unit are arranged in the first heat exchanger, the temperature measuring unit is used for detecting the temperature of the first liquid in the first heat exchanger; and when the temperature of the first liquid in the first heat exchanger and / or the second heat exchanger is greater than a set threshold value, the protection unit performs corresponding alarm prompt.

[0011] Further, the first water tank is provided with a drain port, the position of the drain port is higher than the upper surface of the first heat exchanger; and the first water tank and the second water tank are both provided with a waste discharge port for discharging waste liquid in the first accommodating cavity and the second accommodating cavity.

[0012] Further, any one of the first water tank and the second water tank is provided with a first liquid level detection mechanism, a second liquid level detection mechanism and a third liquid level detection mechanism arranged in sequence in the height direction, the first liquid level detection mechanism is arranged above the second liquid level detection mechanism and the third liquid level detection mechanism; and the second liquid level detection mechanism is arranged above the third liquid level detection mechanism. The height of the second liquid level detection mechanism is higher than the upper surface of the first heat exchanger or the second heat exchanger.

[0013] Further, the first water tank is provided with a liquid level observation pipeline extending in the height direction, both ends of the liquid level observation pipeline are in communication with the first accommodating cavity; and / or the second water tank is provided with a liquid level observation pipeline extending in the height direction, both ends of the liquid level observation pipeline are in communication with the second accommodating cavity.

[0014] Further, the water heater is connected with a working pipeline for conveying the liquid to be heated, the first water tank and the second water tank are respectively provided with a first liquid supplement port and a second liquid supplement port, and the first liquid supplement port, the second liquid supplement port and the input port are in communication with the working pipeline.

[0015] Further, the water heater comprises an outer housing, the outer housing surrounds a containing space, the first water tank and the second water tank are arranged in the containing space, the first water tank and the second water tank are arranged horizontally in the containing space and are located at the bottom of the containing space, the heat pump unit is located above the first water tank or the second water tank, the heat pump unit is communicated with the first water tank and the second water tank through a circulating pipeline, and the circulating pipeline is arranged in the containing space; or, the first water tank and the second water tank are distributed in the containing space along the height direction, the first water tank and the second water tank are communicated through the circulating pipeline extending along the height direction, and the circulating pipeline is arranged outside the containing space.

[0016] The water heater provided in the application uses the water pump arranged on the circulating pipeline to pump the second liquid in the first water tank and the second water tank to the heat pump unit through the circulating pipeline, heats the second liquid through the heat pump unit, and delivers the heated second liquid back to the first water tank and the second water tank through the circulating pipeline, so as to realize the circulating heating of the second liquid, and use the second liquid with a higher temperature than the first liquid to heat the first liquid in the first heat exchanger and the second heat exchanger, thereby reducing the heating cost and reducing the energy consumption of the water heater. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a left front view structure diagram of the water heater in the embodiment of the application;

[0018] Figure 2 It is a right rear view structure diagram of the water heater in the embodiment of the application;

[0019] Figure 3 It is a local enlarged view of A of the water heater in the embodiment of the application;

[0020] Figure 4 It is a right front view structure diagram of the water heater in the embodiment of the application;

[0021] Figure 5 It is a structure diagram of the water heater in the embodiment of the application;

[0022] Figure 6 It is another structure diagram of the water heater in the embodiment of the application. DETAILED DESCRIPTION

[0023] In order for those skilled in the art to better understand the scheme of the application, the technical scheme in the specific embodiment of the application will be described clearly and completely below in combination with the drawings in the embodiment of the application.

[0024] It should be noted that the up, down, left, right and other directional terms mentioned in the present application or the ordinal terms such as "first" and "second" are based on the drawings as a reference, and are introduced for the convenience of description, and do not mean any limitation on the order of the components.

[0025] The hot water machine is applied to a photovoltaic etching device, a second liquid is delivered to a heat pump unit by a circulating pipeline and a water pump, the second liquid is heated by the heat pump unit, the heated second liquid is delivered back to a first water tank and a second water tank through the circulating pipeline, the first liquid is heated by the second liquid, the heating cost is reduced, and the energy consumption of the hot water machine is reduced.

[0026] As shown in Figure 1 As an implementation manner, the hot water machine 100 includes a first water tank 11, a second water tank 12, a circulating pipeline 13, a heating system 14, and a water pump 15. The first water tank 11 includes a first containing cavity 111 and a first heat exchanger 112 arranged in the first containing cavity 111, and the first heat exchanger 112 has an input port 1121 for receiving a first liquid. The second water tank 12 includes a second containing cavity 121 and a second heat exchanger 122 arranged in the second containing cavity 121, and the second heat exchanger 122 is used for receiving the first liquid preliminarily heated by the first heat exchanger 112, the second heat exchanger 122 is in communication with the first heat exchanger 112, and has an output port 1221 for outputting the first liquid after heating from the second heat exchanger 122. The circulating pipeline 13 is installed between the first water tank 11 and the second water tank 12 to communicate the first containing cavity 111 and the second containing cavity 121; the heating system 14 includes a heat pump unit 141, the heat pump unit 141 is in communication with the circulating pipeline 13, and the heat pump unit 141 is used for heating a second liquid in the hot water machine 100; the water pump 15 is connected with the circulating pipeline 13 and arranged on the circulating pipeline 13, and the water pump 15 is used for pumping the second liquid in the first water tank 11 and / or the second water tank 12 into the heat pump unit 141. In order to clearly illustrate the technical solutions of the present application, the up-down, left-right, front-back directions as shown in Figure 1

[0027] The first liquid enters the first heat exchanger 112 through the input port 1121, is heated by the second liquid water bath in the first water tank 11 in the first heat exchanger 112, enters the second heat exchanger 122 after heating, and is heated by the second liquid water bath in the second water tank 12 in the second heat exchanger 122, and the first liquid after heating is delivered out of the hot water machine 100 through the output port 1221. When the second liquid needs to be heated, the water pump 15 arranged on the circulating pipeline 13 pumps the second liquid to the heat pump unit 141 through the circulating pipeline 13, the heat pump unit 141 heats the second liquid, and then delivers the heated second liquid back to the first water tank 11 and the second water tank 12 through the circulating pipeline 13.

[0028] As shown in Figure 1 ​As shown, in one implementation, the heating system 14 includes a first heating mechanism 142, which is disposed within the first receiving cavity 111 and arranged below the first heat exchanger 112. When the heating effect of the heat pump unit 141 on the second liquid in the first water tank 11 fails to bring the temperature of the second liquid to the first temperature, the first heating mechanism 142 enhances the heating effect on the second liquid, enabling the temperature of the second liquid to reach the first temperature.

[0029] Optionally, the heating system 14 includes a second heating mechanism 143, which is disposed within the second receiving cavity 121 and arranged below the second heat exchanger 122. When the heating effect of the heat pump unit 141 on the second liquid in the second water tank 12 fails to bring the temperature of the second liquid to the first temperature, the second heating mechanism 143 enhances the heating effect on the second liquid, enabling the temperature of the second liquid to reach the first temperature.

[0030] For example, the first heating mechanism 142 and the second heating mechanism 143 include a plurality of heating rods.

[0031] like Figure 1 As shown, in one implementation, the first heat exchanger 112 is suspended within the first receiving cavity 111 and is positioned substantially in the middle of the first receiving cavity 111; the second heat exchanger 122 is suspended within the second receiving cavity 121 and is positioned substantially in the middle of the second receiving cavity 121. The first heat exchanger 112 and the second heat exchanger 122 are connected by a pipe. During the heating process, the liquid level of the second liquid is higher than the upper surfaces of the first heat exchanger 112 and the second heat exchanger 122, so that the first heat exchanger 112 and the second heat exchanger 122 are completely immersed in the second liquid. The positioning of the first heat exchanger 112 and the second heat exchanger 122 allows the first liquid in the first heat exchanger 112 and the second heat exchanger 122 to be heated from all directions during heating.

[0032] Exemplarily, the first heat exchanger 112 and the second heat exchanger 122 use a copper alloy material, which has good heat conduction performance and is corrosion resistant. After the first liquid to be heated enters the first heat exchanger 112, the second liquid in the first water tank 11 transfers heat to the first liquid in the first heat exchanger 112 through the first heat exchanger 112, so that the first liquid in the first heat exchanger 112 is warmed up and preliminarily heated to at least reach the second temperature, wherein the temperature of the second liquid is greater than the second temperature; after the first liquid in the first heat exchanger 112 is preliminarily heated, the first liquid is transmitted to the second heat exchanger 122 through the pipeline between the first heat exchanger 112 and the second heat exchanger 122, and the second liquid in the second water tank 12 transfers heat to the first liquid in the second heat exchanger 122 through the second heat exchanger 122, so as to reheat the first liquid to at least reach the third temperature, wherein the temperature of the second liquid is greater than the third temperature.

[0033] As shown in Figure 1 and Figure 2 as an implementation manner, the first water tank 11 and the second water tank 12 form a water tank group, the circulation pipeline 13 includes a first pipeline 131 and a second pipeline 132, the first pipeline 131 and the second pipeline 132 are arranged on opposite sides of the water tank group respectively, and the heat pump unit 141 is connected with the water tank group through the first pipeline 131 and the second pipeline 132. Specifically, the heat pump unit 141 has a water inlet 1411 and a water outlet 1412, the water inlet 1411 is connected with the first pipeline 131, and the water outlet 1412 is connected with the second pipeline 132; further, the water pump 15 is arranged between the water inlet 1411 and at least part of the first pipeline 131.

[0034] In the embodiment of the present application, the first pipeline 131 is arranged in front of the water tank group, the second pipeline 132 is arranged behind the water tank group, the first pipeline 131 includes a first pipeline main pipeline 1311 and two first pipeline branch pipelines 1312 respectively communicating with the first water tank 11 and the second water tank 12, the water pump 15 is arranged on the first pipeline main pipeline 1311, the second pipeline 132 includes a second pipeline main pipeline 1321 and two second pipeline branch pipelines 1322 respectively communicating with the first water tank 11 and the second water tank 12. When the second liquid in the first water tank 11 and the second water tank 12 needs to be heated, the water pump 15 pumps the second liquid to be heated out of the first water tank 11 and the second water tank 12 through the two first pipeline branch pipelines 1312, and pumps the second liquid to the heat pump unit 141 through the first pipeline main pipeline 1311, after being heated by the heat pump unit 141, the heated second liquid is delivered back to the first water tank 11 and the second water tank 12 through the second pipeline main pipeline 1321 and the two second pipeline branch pipelines 1322, to complete a heating cycle of the second liquid.

[0035] AsFigure 3 As shown, as an implementation, the heating system 14 comprises a temperature measuring unit 144 and a protection unit 145, at least part of the temperature measuring unit 144 is arranged in the first heat exchanger 112, and at least part of the protection unit 145 is arranged in the first heat exchanger 112. The temperature measuring unit 144 is used to detect the temperature of the first liquid in the first heat exchanger 112; the protection unit 145 is used to alarm abnormal temperature, and the protection unit 145 performs a response alarm prompt when the temperature of the first liquid in the first heat exchanger 112 and / or the second heat exchanger 122 is greater than a set threshold value.

[0036] Exemplarily, the temperature measuring unit 144 comprises a first thermometer 1441, the first thermometer 1441 is partially arranged in the first heat exchanger 112 and close to the input port 1121, the first thermometer 1441 is connected to an external dial (not shown in the figure) and is used to measure the temperature of the first liquid input into the water heater 100 in the first heat exchanger 112, and the dial displays the temperature of the first liquid measured by the first thermometer 1441. The protection unit 145 comprises a first temperature protector 1451, the first temperature protector 1451 is partially arranged in the first heat exchanger 112, the first temperature protector 1451 is connected to an alarm (not shown in the figure) and is provided with a first threshold value. When the temperature of the first liquid in the first heat exchanger 112 is higher than the first threshold value, the alarm will issue a warning; after the alarm issues a warning and continues to heat the first liquid, the temperature of the first liquid is higher than the first threshold value, the water heater 100 will cut off the power supply and stop heating to prevent safety hazards.

[0037] Optionally, the temperature measuring unit 144 comprises a second thermometer 1442, the second thermometer 1442 is partially arranged in the second heat exchanger 122 and close to the output port 1221, the second thermometer 1442 is connected to an external dial and is used to measure the temperature of the first liquid to be output from the water heater 100 in the second heat exchanger 122, and the dial displays the temperature of the first liquid measured by the second thermometer 1442. The protection unit 145 comprises a second temperature protector 1452, the second temperature protector 1452 is partially arranged in the second heat exchanger 122, the second temperature protector 1452 is connected to an alarm, provided with a second threshold value, and the second threshold value is greater than the first threshold value. When the temperature of the first liquid in the second heat exchanger 122 is higher than the second threshold value, the alarm will issue a warning; after the alarm issues a warning and continues to heat the first liquid, the temperature of the first liquid is higher than the second threshold value, the water heater 100 will cut off the power supply and stop heating to prevent safety hazards.

[0038] As Figure 3As shown, in one implementation, the first water tank 11 is provided with a drain outlet, which is located above the upper surface of the first heat exchanger 112. When there is too much second liquid in the first water tank 11, the second liquid will be discharged from the first water tank 11 through the drain outlet. Since the first water tank 11 and the second water tank 12 are connected, when the water heater 100 is placed horizontally, the liquid level of the second liquid in the first water tank 11 and the second water tank 12 is the same, and the excess second liquid in the first water tank 11 and the second water tank 12 can be discharged through the drain outlet. The drain outlet can also maintain the pressure stability within the water tank assembly.

[0039] like Figure 3 As shown, in one embodiment, the water heater 100 also includes a liquid level detection system 16, which includes a first liquid level detection mechanism 161, a second liquid level detection mechanism 162, and a third liquid level detection mechanism 163. The first liquid level detection mechanism 161, the second liquid level detection mechanism 162, and the third liquid level detection mechanism 163 are provided on either the first water tank 11 or the second water tank 12. These three mechanisms are arranged sequentially along their height, with the first liquid level detection mechanism 161 positioned above the second liquid level detection mechanism 162 and the third liquid level detection mechanism 163; the second liquid level detection mechanism 162 is positioned above the third liquid level detection mechanism 163.

[0040] The first liquid level detection mechanism 161 is used to detect whether the liquid level of the second liquid in the water tank group is too high. If the first liquid level detection mechanism 161 is triggered, it means that the liquid level in the water tank group is too high, and the second liquid in the water tank group will be discharged from the water tank group through the drain outlet.

[0041] The second liquid level detection mechanism 162 is used to detect whether the liquid level of the second liquid in the water tank assembly is at the normal operating level. At the normal operating level, the liquid level in the water tank assembly should be higher than the upper surface of the first heat exchanger 112 or the second heat exchanger 122, so that the first liquid in the first heat exchanger 112 or the second heat exchanger 122 can be heated from all directions. For this reason, the second liquid level detection mechanism 162 is set at a height higher than the upper surface of the first heat exchanger 112 or the second heat exchanger 122. When the second liquid level detection mechanism 162 is triggered and the first liquid level detection mechanism 161 is not triggered, the liquid level of the second liquid in the water tank assembly is at the normal operating level. When the second liquid level detection mechanism 162 is not triggered, the liquid level of the second liquid in the water tank assembly is not at the normal operating level, which will result in poor heating effect of the water heater 100 on the first liquid, requiring liquid replenishment.

[0042] The third liquid level detection mechanism 163 is used to detect whether the liquid level in the water tank group is too low. If the third liquid level detection mechanism 163 is not triggered, it indicates that the liquid level of the second liquid in the water tank group is too low, and the second liquid in the water tank group is seriously insufficient.

[0043] Exemplarily, the first liquid level detection mechanism 161, the second liquid level detection mechanism 162, and the third liquid level detection mechanism 163 can be selected as a floating ball.

[0044] As shown in Figure 3 As an implementation manner, the first water tank 11 includes a first waste outlet 114, which is arranged at the bottom of the first water tank 11 and is used to discharge the second liquid in the first containing cavity 111 and the leakage of the water heater 100. The first waste outlet 114 is in communication with the waste pipe 101, and the waste pipe 101 is provided with a valve 1011 for controlling the opening and closing state of the waste pipe 101 and further controlling the discharge of waste liquid of the water heater 100.

[0045] Optionally, the second water tank 12 includes a second waste outlet 123, which is arranged at the bottom of the second water tank 12 and is used to discharge the second liquid in the second containing cavity 121 and the leakage of the water heater 100. The second waste outlet 123 is in communication with the waste pipe 101, and the waste pipe 101 is provided with a valve 1011 for controlling the opening and closing state of the waste pipe 101 and further controlling the discharge of waste liquid of the water heater 100.

[0046] As shown in Figure 3 As an implementation manner, the first water tank 11 is provided with a first liquid level observation pipe 115, which extends along the height direction (the height direction is parallel to the up-down direction of the water heater 100). Both ends of the first liquid level observation pipe 115 are in communication with the first containing cavity 111. Based on the principle of a communicating vessel, the liquid level of the first liquid level observation pipe 115 is consistent with the liquid level in the first containing cavity 111. The first liquid level observation pipe 115 is made of transparent material, so that the liquid level in the first containing cavity 111 can be known through the first liquid level observation pipe 115.

[0047] Optionally, the second water tank 12 is provided with a second liquid level observation pipe 124, which extends along the height direction. Both ends of the second liquid level observation pipe 124 are in communication with the second containing cavity 121. Based on the principle of a communicating vessel, the liquid level of the second liquid level observation pipe 124 is consistent with the liquid level in the second containing cavity 121. The second liquid level observation pipe 124 is made of transparent material, so that the liquid level in the second containing cavity 121 can be known through the second liquid level observation pipe 124.

[0048] As shown in Figure 4As shown, as an implementation manner, the first water tank 11 is provided with a first liquid supplementing port 116, the second water tank 12 is provided with a second liquid supplementing port 125, and the water heater 100 is connected with a working pipeline 102 for conveying the first liquid to be heated, the working pipeline 102 is communicated with the first liquid supplementing port 116, the second liquid supplementing port 125 and the input port 1121. The first liquid supplementing port 116 is used for supplementing the second liquid to the first water tank 11, and the second liquid supplementing port 125 is used for supplementing the second liquid to the second water tank 12.

[0049] When the first liquid and the second liquid are the same liquid, the working pipeline 102 can be input through the same inlet, and after the liquid is input into the working pipeline 102, the working pipeline 102 is branched into a first branch 1021, a second branch 1022 and a third branch 1023, the first branch 1021, the second branch 1022 and the third branch 1023 are respectively communicated with the first liquid supplementing port 116, the second liquid supplementing port 125 and the input port 1121, and the first branch 1021, the second branch 1022 and the third branch 1023 are all provided with valves to control the opening and closing states of the first branch 1021, the second branch 1022 and the third branch 1023, thereby controlling the liquid input into the water heater 100. A Y-type filter 103 is arranged between the first branch 1021, the second branch 1022 and the third branch 1023 and the input end of the working pipeline 102, and the Y-type filter 103 is used for filtering the liquid to be input into the water heater 100.

[0050] Alternatively, when the first liquid and the second liquid are different liquids, a first inlet and a second inlet (not shown in the figure) can be arranged on the working pipeline 102, the first inlet enters the working pipeline 102 communicated with the first liquid supplementing port 116 and the second liquid supplementing port 125 to supplement the second liquid into the water heater 100, and the second inlet enters the working pipeline 102 communicated with the input port 1121 to input the first liquid into the water heater 100, the first inlet and the second inlet are respectively provided with valves to control the opening and closing states, and the first inlet and the second inlet are respectively provided with Y-type filters 103 to filter the liquid to be input into the water heater 100.

[0051] As shown, Figure 5As shown, in one implementation, the water heater 100 also includes a housing 17 and an electrical system 18. The housing forms an accommodating space, in which a first water tank 11, a second water tank 12, a circulation pipe 13, a heating system 14, a water pump 15, a detection system 16, and at least a portion of the electrical system 18 are housed. The electrical system 18 includes a power supply component (not shown) that drives the water pump 15, a processor (not shown), control buttons 181, and a display screen 182 for displaying various data of the water heater 100. During operation, the water heater 100 does not require connection to external devices. The set temperature of the water heater 100 can be adjusted via the control buttons. The processor can process signals emitted during the operation of the water heater 100 (such as temperature data measured by the temperature measuring unit 144) and display the processed data on the display screen 182 using visual text.

[0052] Specifically, the first water tank 11 and the second water tank 12 are horizontally arranged in the accommodating space and located at the bottom of the accommodating space, with the heat pump unit 141 positioned above either the first water tank 11 or the second water tank 12. In this embodiment, the heat pump unit 141 is located above the second water tank 12, and the heat pump unit 141 is connected to both the first water tank 11 and the second water tank 12 via a circulation pipe 13. The electrical system 18 is located above the first water tank 11. Based on this, when the first water tank 11 and the second water tank 12 are connected via the circulation pipe 13, the circulation pipe 13 can be arranged within the accommodating space. With the first water tank 11 or the second water tank 12 as a reference, the circulation pipe 13 is located either in front of or behind the first water tank 11 or the second water tank 12, ensuring that the circulation pipe 13 does not interfere with the heat pump unit 141 during its arrangement.

[0053] like Figure 6 As shown, as an optional implementation, the first water tank 11 and the second water tank 12 are distributed along the height direction in the accommodating space, and the first water tank 11 and the second water tank 12 are connected by a circulation pipe 13 extending along the height direction. Based on this, the circulation pipe 13 connecting the first water tank 11 and the second water tank 12 can be arranged outside the accommodating space. Taking the first water tank 11 or the second water tank 12 as a reference, the heat pump unit 141 is arranged on the side of the second water tank 12 away from the circulation pipe 13, and the electrical system 18 is arranged above the heat pump unit 141.

[0054] In summary, the embodiment of the present application pumps the second liquid in the first water tank 11 and the second water tank 12 to the heat pump unit 141 through the first pipeline 131 by the water pump 15, heats the second liquid by the heat pump unit 141, and delivers the heated second liquid back to the first water tank 11 and the second water tank 12 through the second pipeline 132, thereby forming a circulation. When the heating effect of the heat pump unit 141 on the second liquid is insufficient to make the second liquid reach the first temperature, the heating effect is enhanced by the first heating mechanism 142 and the second heating mechanism 143 to ensure that the temperature of the second liquid is maintained above the first temperature. The first liquid in the first heat exchanger 112 and the second heat exchanger 122 is heated by the second liquid with a temperature higher than the first temperature after heating, thereby reducing energy consumption and saving heating cost.

[0055] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the claims attached to the present application.

Claims

1. A hot water machine applied to a photovoltaic etching device, characterized in that, The water heater comprises: a first water tank comprising a first accommodating cavity and a first heat exchanger arranged in the first accommodating cavity, the first heat exchanger having an input port for receiving a first liquid to be heated; a second water tank comprising a second accommodating cavity and a second heat exchanger arranged in the second accommodating cavity, the second heat exchanger being in communication with the first heat exchanger and being configured to receive the first liquid preliminarily heated by the first heat exchanger, the second heat exchanger having an output port for outputting the first liquid heated to completion from the second heat exchanger; a circulation pipeline arranged between the first water tank and the second water tank and connecting the first accommodating cavity and the second accommodating cavity; a heating system comprising a heat pump unit in communication with the circulation pipeline; and a water pump connected to the circulation pipeline and configured to pump a second liquid in the first water tank and / or the second water tank into the heat pump unit.

2. The water heater according to claim 1, wherein the heating system further comprises a first heating mechanism arranged in the first accommodating cavity and below the first heat exchanger, and a second heating mechanism arranged in the second accommodating cavity and below the second heat exchanger.

3. The water heater according to claim 1, wherein the first heat exchanger is suspended in the first accommodating cavity and substantially at a middle position of the first accommodating cavity, and the second heat exchanger is suspended in the second accommodating cavity and substantially at a middle position of the second accommodating cavity.

4. The water heater according to claim 1, wherein the circulation pipeline comprises a first pipeline and a second pipeline, the heat pump unit has a water inlet connected to the first pipeline and a water outlet connected to the second pipeline, the water pump is arranged between the water inlet and at least part of the first pipeline, and the first water tank and the second water tank form a water tank group, and the first pipeline and the second pipeline are arranged on opposite sides of the water tank group, respectively.

5. The water heater according to claim 1, wherein the heating system comprises a temperature measuring unit and a protection unit, at least part of the temperature measuring unit and at least part of the protection unit are arranged in the first heat exchanger, the temperature measuring unit is configured to detect a temperature of the first liquid in the first heat exchanger, and the protection unit is configured to perform corresponding alarm prompt when the temperature of the first liquid in the first heat exchanger and / or the second heat exchanger is greater than a set threshold value.

6. The water heater according to claim 1, wherein the first water tank is provided with a drain port, and the drain port is located higher than an upper surface of the first heat exchanger.

7. The water heater according to claim 1, wherein the first water tank and the second water tank are each provided with a waste outlet for discharging waste liquid in the first accommodating cavity and the second accommodating cavity. ​ ​ ​ ​ ​ ​ Any one of the first water tank and the second water tank is provided with a first liquid level detection mechanism, a second liquid level detection mechanism and a third liquid level detection mechanism arranged in sequence in the height direction, the first liquid level detection mechanism is arranged above the second liquid level detection mechanism and the third liquid level detection mechanism; the second liquid level detection mechanism is arranged above the third liquid level detection mechanism; wherein the height of the second liquid level detection mechanism is higher than the upper surface of the first heat exchanger or the second heat exchanger.

8. The water heater according to claim 1, characterized in that, The first water tank is provided with a liquid level observation pipe extending in the height direction, both ends of the liquid level observation pipe are in communication with the first containing cavity; And / or, the second water tank is provided with a liquid level observation pipe extending in the height direction, both ends of the liquid level observation pipe are in communication with the second containing cavity.

9. The water heater according to claim 1, characterized in that, The water heater is connected with a working pipeline for conveying liquid to be heated, the first water tank and the second water tank are respectively provided with a first liquid supplementing port and a second liquid supplementing port, the first liquid supplementing port, the second liquid supplementing port and the input port are in communication with the working pipeline.

10. The water heater according to claim 1, characterized in that, The water heater comprises an outer shell, the outer shell is surrounded to form a containing space, the first water tank and the second water tank are arranged in the containing space, the first water tank and the second water tank are arranged horizontally in the containing space and are located at the bottom of the containing space, the heat pump unit is located above the first water tank or the second water tank, the heat pump unit is in communication with the first water tank and the second water tank through the circulating pipeline, and the circulating pipeline is arranged in the containing space; Or, the first water tank and the second water tank are distributed in the containing space in the height direction, the first water tank and the second water tank are communicated through the circulating pipeline extending in the height direction, and the circulating pipeline is arranged outside the containing space.

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