Condenser heat exchanger structure, water heater and heat exchanger control method

Abstract

The application discloses a condensing heat exchanger structure, a water heater and a heat exchanger control method, and relates to the technical field of water heaters. The condensing heat exchanger structure comprises a heat exchange shell, a heat exchange assembly and an anti-freezing assembly. The heat exchange shell is internally provided with a heat exchange cavity located at an upper portion and a heating cavity located at a lower portion. The heat exchange assembly is located in the heat exchange cavity, and the anti-freezing assembly is located in the heating cavity. The condensate water generated by the heat exchange assembly can drip into the heating cavity. The bottom of the heat exchange shell is provided with a discharge port which is in communication with the heating cavity and is used for discharging the condensate water collected in the heating cavity. The anti-freezing assembly is arranged in the heating cavity, the collected condensate water in the heating cavity is prevented from freezing, and the condensate water can always keep in a fluid state and be discharged through the discharge port at the bottom of the heat exchange shell. The technical problem that the discharge port is blocked due to the freezing of the condensate water when the condensate water is discharged in the traditional condensing heat exchanger structure is solved.

Description

Technical Field

[0001] This invention belongs to the field of water heater technology, and relates to a condensing heat exchanger structure, a water heater, and a heat exchanger control method. Background Technology

[0002] A gas water heater, also known as a gas water boiler, is a gas appliance that uses gas as fuel and heats water by burning it, transferring heat to cold water flowing through a heat exchanger to produce hot water.

[0003] Among gas water heaters, condensing gas water heaters are favored by the market due to their high heat exchange efficiency. Currently, the condensate drainage method for condensing water heaters on the market is as follows: condensate drips to the bottom of the condenser and is then discharged to the outside of the unit through a connecting pipe. The drawback of this design is that the condensate freezes upon hitting the bottom of the condensing heat exchanger, clogging the condensate drain port. Subsequent condensate production will be unable to drain from the condenser, causing condensate to backflow into the fan, resulting in corrosion and damage to the fan and the entire water heater, as well as safety hazards due to water exposure. Summary of the Invention

[0004] In view of this, the present invention provides a condensing heat exchanger structure, a water heater, and a heat exchanger control method, which solves the technical problem of the discharge port being blocked due to condensate freezing when the traditional condensing heat exchanger structure discharges condensate.

[0005] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a condensing heat exchanger structure, the condensing heat exchanger structure including a heat exchange shell, a heat exchange component, and an antifreeze component. The heat exchange shell has an upper heat exchange chamber and a lower heating chamber. The heat exchange component is located within the heat exchange chamber, the antifreeze component is located within the heating chamber, and the condensate generated by the heat exchange component can drip into the heating chamber. The bottom of the heat exchange shell has a drain port, which communicates with the heating chamber for discharging the condensate collected in the heating chamber.

[0006] In some embodiments, the antifreeze component includes a temperature acquisition unit and a heating unit, both of which are disposed at the bottom of the heating chamber; and the temperature acquisition unit is capable of acquiring the real-time temperature of the condensate in the heating chamber, and the heating unit operates or does not operate according to the real-time temperature.

[0007] In some embodiments, the bottom of the heat exchange housing gradually slopes downwards along a direction from away from the center to closer to the center, such that condensate in the heating chamber can collect at the center of the heat exchange housing; the discharge port is located at the center of the heat exchange housing.

[0008] In some embodiments, the heating unit is a heating coil covering the bottom surface of the heat exchange housing; and the distance between adjacent heating coils gradually decreases along the direction from away from the center to closer to the center.

[0009] In some embodiments, the temperature acquisition unit includes a temperature sensor.

[0010] According to another aspect of this application, an embodiment of the present invention provides a water heater that includes the above-described condensing heat exchanger structure.

[0011] In some embodiments, the water heater further includes a casing, a burner, a secondary heat exchanger, and a fan. The condensing heat exchanger structure, the burner, the secondary heat exchanger, and the fan are all disposed within the casing. The burner heats the secondary heat exchanger, and the flue gas generated by the secondary heat exchanger enters the condensing heat exchanger structure after passing through the fan.

[0012] In some embodiments, the heat exchange chamber has an air inlet on one side, which is connected to the air outlet of the fan; the heat exchange chamber has an air outlet at the top, which extends out of the outer casing and is connected to the exhaust pipe of the water heater.

[0013] In some embodiments, the water heater further includes a main controller, which has a preset temperature. When the antifreeze component includes a temperature acquisition unit and a heating unit, the main controller is connected to the temperature acquisition unit to receive the real-time temperature acquired by the temperature acquisition unit. The main controller is also connected to the heating unit to control the working state of the heating unit based on the difference between the real-time temperature and the preset temperature.

[0014] In some embodiments, the water heater further includes an inlet assembly and an outlet assembly. The inlet assembly includes an inlet connector, which is connected to an inlet port located at the bottom of the heat exchange housing via an inlet pipe. The outlet assembly includes an outlet pipe connected to a secondary heat exchanger, which is connected to an outlet connector located on the outer casing.

[0015] According to another aspect of this application, embodiments of the present invention provide a heat exchanger control method for controlling a water heater. The antifreeze component in the water heater includes a temperature acquisition unit and a heating unit. The water heater includes a main controller, which is connected to both the temperature acquisition unit and the heating unit. The control method includes:

[0016] Step 1: The temperature acquisition unit acquires the real-time temperature of the condensate in the heating chamber and transmits it to the main controller.

[0017] Step 2: The main controller receives the real-time temperature of the condensate and compares it with the preset temperature preset in the main controller.

[0018] Step 3: The main controller controls the working state of the heating unit based on the comparison results.

[0019] In some embodiments, the main controller in step three controls the working state of the heating unit according to the comparison result, specifically: when the real-time temperature is greater than or equal to the preset temperature, the heating unit does not work; conversely, when the real-time temperature is less than the preset temperature, the heating unit works.

[0020] And / or the preset temperature is 1-3℃.

[0021] Compared with the prior art, the cooling structure of the present invention has at least the following beneficial effects:

[0022] The condenser heat exchanger structure provided by the present invention includes a heat exchange shell, a heat exchange component, and an antifreeze component. The heat exchange shell has a heat exchange chamber located at the top and a heating chamber located at the bottom. The heat exchange component is located in the heat exchange chamber, and the antifreeze component is located in the heating chamber. The condensate generated by the heat exchange component can drip into the heating chamber. The bottom of the heat exchange shell has a discharge port, which is connected to the heating chamber for discharging the condensate collected in the heating chamber.

[0023] This invention prevents the condensate collected in the heating chamber from freezing by installing an antifreeze component, keeping it in a fluid state so that it can be discharged through the drain port at the bottom of the heat exchange shell, thus avoiding blockage of the drain port after the condensate freezes.

[0024] The water heater provided by this invention is designed based on the above-mentioned condenser heat exchanger structure. Its beneficial effects are the same as those of the above-mentioned condenser heat exchanger structure, and will not be repeated here.

[0025] The water heater control method provided by this invention is designed based on the above-mentioned water heater, and its beneficial effects are the same as those of the above-mentioned water heater, which will not be repeated here.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of a condensing heat exchanger provided in an embodiment of the present invention;

[0029] Figure 2 This is another cross-sectional view of a condensing heat exchanger provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of a condensing heat exchanger provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of a heating unit in a condensing heat exchanger provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of another structure of a heating unit in a condensing heat exchanger provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a water heater provided in an embodiment of the present invention;

[0034] Figure 7 This is a control block diagram of a water heater provided in an embodiment of the present invention;

[0035] Figure 8 This is a control flowchart of a water heater control method provided by an embodiment of the present invention.

[0036] in:

[0037] 1. Condensing heat exchanger structure; 11. Heat exchange shell; 12. Heat exchange assembly; 13. Anti-freeze assembly; 111. Heat exchange chamber; 112. Heating chamber; 113. Discharge port; 114. Water inlet; 115. Water outlet; 116. Heat exchange water outlet pipe; 131. Temperature acquisition unit; 132. Heating unit; 1111. Air inlet; 1112. Air outlet; 1321. First heating coil; 1322. Second heating coil; 1323. Third heating coil; 1324. Fourth heating coil; 1325. Fifth heating coil;

[0038] 2. Outer shell;

[0039] 3. Burner;

[0040] 4. Secondary heat exchanger; 41. Heat exchange tubes;

[0041] 5. Fan;

[0042] 6. Main controller;

[0043] 7. Water inlet assembly; 71. Water inlet connector; 72. Water inlet pipe;

[0044] 8. Water outlet assembly; 81. Water outlet pipe; 82. Water outlet connector. Detailed Implementation

[0045] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0046] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Example 1

[0049] This embodiment provides a condensing heat exchanger structure, such as Figure 1-5 As shown, the condenser heat exchanger structure includes a heat exchange shell 11, a heat exchange assembly 12, and an antifreeze assembly 13. The heat exchange shell 11 has an upper heat exchange chamber 111 and a lower heating chamber 112. The heat exchange assembly 12 is located in the heat exchange chamber 111, and the antifreeze assembly 13 is located in the heating chamber 112. The condensate generated by the heat exchange assembly 12 can drip into the heating chamber 112. The bottom of the heat exchange shell 11 has a drain port 113, which is connected to the heating chamber 112 to discharge the condensate collected in the heating chamber 112.

[0050] Specifically, in this embodiment, the heat exchange shell 11 is a hollow structure, and its internal cavity can be divided into an upper part and a lower part. Of course, the upper part and the lower part are integrated, but they are distinguished here only for ease of description. The upper part is the heat exchange chamber 111, in which the heat exchange component 12 is disposed, and the lower part is the heating chamber 112, in which the antifreeze component 13 is disposed. In actual use, the heat exchange component 12 in the heat exchange chamber 111 will generate condensate, which drips into the heating chamber 112 under the action of gravity. The antifreeze component 13 disposed in the heating chamber 112 can prevent the condensate collected in the heating chamber 112 from freezing, keeping it in a fluid state. It can then be discharged through the drain port 113 at the bottom of the heat exchange shell 11, preventing the condensate from freezing and clogging the drain port 113.

[0051] In a specific embodiment, such as Figure 1 As shown, the antifreeze component 13 includes a temperature acquisition unit 131 and a heating unit 132. Both the temperature acquisition unit 131 and the heating unit 132 are located at the bottom of the heating chamber 112. The temperature acquisition unit 131 can acquire the real-time temperature of the condensate in the heating chamber 112, and the heating unit 132 can work or not work according to the real-time temperature.

[0052] Specifically, the condensate generated by the heat exchange component 12 drips onto the bottom surface of the heat exchange housing 11. The temperature acquisition unit 131, located on the bottom surface, can acquire the real-time temperature of the condensate, while the heating unit 132, also located on the bottom surface, can heat the condensate. In other words, in this embodiment, the heat exchange chamber 111 is above the heating chamber 112. The condensate generated by the heat exchange chamber 111 drips onto the bottom surface of the heating chamber 112. The heating chamber 112 is equipped with the heating unit 132, which can heat the condensate to prevent it from freezing.

[0053] In the specific working process, when the real-time temperature of the condensate collected by the temperature acquisition unit 131 is low, such as close to the freezing temperature, the heating unit 132 will work to heat the condensate; conversely, when the real-time temperature of the condensate collected by the temperature acquisition unit 131 is high, it means that the condensate will not freeze, and the heating unit 132 will not work.

[0054] In a specific embodiment, the bottom of the heat exchange housing 11 gradually slopes downward along the direction from away from the center to closer to the center, so that the condensate in the heating chamber 112 can collect at the center of the heat exchange housing 11; the discharge port 113 is located at the center of the heat exchange housing 11.

[0055] Specifically, the bottom of the heat exchange shell 11 near the discharge port 113 is lower than the bottom of the heat exchange shell 11 far from the discharge port 113. In this way, after the condensate generated in the heat exchange chamber 111 drips onto the bottom surface of the heating chamber 112, it will converge along the inclined bottom surface towards the position near the discharge port 113, and then be discharged through the discharge port 113. This arrangement can prevent condensate from accumulating at the bottom of the heat exchange shell 11 and being unable to be discharged.

[0056] In a specific embodiment, the heating unit 132 is a heating coil covering the bottom surface of the heat exchange housing 11; and the distance between adjacent heating coils gradually decreases along the direction from away from the center to closer to the center.

[0057] More specifically, the heating unit 132 includes multiple heating coils arranged sequentially from the inside out, with the smaller diameter heating coil located inside the larger diameter heating coil; for better description, assume there are five heating coils, such as... Figure 4 As shown, from the inside out, the heating coils are: first heating coil 1321, second heating coil 1322, third heating coil 1323, fourth heating coil 1324, and fifth heating coil 1325. The radial distance between the first heating coil 1321 and the second heating coil 1322 is d1, the radial distance between the second heating coil 1322 and the third heating coil 1323 is d2, the radial distance between the third heating coil 1323 and the fourth heating coil 1324 is d3, and the radial distance between the fourth heating coil 1324 and the fifth heating coil 1325 is d4. Therefore, d1... <d2<d3<d4。

[0058] Along the direction from away from the center to closer to the center, the bottom of the heat exchange shell 11 gradually slopes downward, so that the condensate in the heating chamber 112 can collect at the center of the heat exchange shell 11. Therefore, the amount of water at the center of the heat exchange shell 11 is greater than that at the farthest point. Corresponding to the amount of water, the heating coils at the center of the heat exchange shell 11 are arranged more densely, which can heat the condensate more quickly. On the periphery of the heat exchange shell 11, which is far from the center, the heating coils are arranged more sparsely. This arrangement avoids wasting heating coils and also prevents the temperature at the periphery from being too high.

[0059] In addition, such as Figure 5 The diagram shows another specific structure of the heating unit 132. The heating unit 132 is a heating coil forming a spiral structure, which is the same as the structure described above. In the spiral structure, the spiral lines at the center are more densely arranged, while the spiral lines at the edges are more sparsely arranged.

[0060] In a specific embodiment, the temperature acquisition unit 131 includes a temperature sensor.

[0061] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. In this embodiment, the temperature sensor senses the real-time temperature of the condensate in the heating chamber 112 and transmits it to the controller. The controller can control the working state of the heating unit 132 according to the real-time temperature.

[0062] Example 2

[0063] This embodiment provides a water heater, which includes the condenser heat exchanger structure 1 described in Embodiment 1.

[0064] The water heater provided in this embodiment includes the condenser heat exchanger structure 1 of embodiment 1, and therefore has all the beneficial effects of the condenser heat exchanger structure 1 in embodiment 1.

[0065] In a specific embodiment, such as Figure 6 As shown, the water heater also includes a shell 2, a burner 3, a secondary heat exchanger 4, and a fan 5. The condensing heat exchanger structure 1, the burner 3, the secondary heat exchanger 4, and the fan 5 are all disposed inside the shell 2. The burner 3 heats the secondary heat exchanger 4, and the flue gas generated by the secondary heat exchanger 4 enters the condensing heat exchanger structure 1 after passing through the fan 5.

[0066] Specifically, in actual operation, when cold water enters the water heater, the burner 3 is turned on and ignited, and the fan 5 is working. During operation, the high-temperature flue gas drawn out by the fan 5 enters the condenser heat exchanger structure 1 and heats the heat exchange component 12, thereby initially heating the temperature of the heat exchange component 12. This greatly reduces the use of gas and thus improves thermal efficiency.

[0067] In a specific embodiment, such as Figure 1-3 As shown, the heat exchange chamber 111 has an air inlet 1111 on one side, which is connected to the air outlet of the fan 5; the heat exchange chamber 111 has an air outlet 1112 at the top, which extends out of the outer shell 2 and is connected to the exhaust pipe of the water heater.

[0068] More specifically, the air inlet 1111 of the condenser heat exchanger structure 1 is connected to the air outlet of the fan 5, and the air outlet 1112 of the condenser heat exchanger structure 1 extends out of the outer shell 2 and is connected to the flue pipe.

[0069] In a specific embodiment, such as Figure 7As shown, the water heater also includes a main controller 6, which has a preset temperature. When the antifreeze component 13 includes a temperature acquisition unit 131 and a heating unit 132, the main controller 6 is connected to the temperature acquisition unit 131 to receive the real-time temperature acquired by the temperature acquisition unit 131. The main controller 6 is also connected to the heating unit 132 to control the working state of the heating unit 132 according to the difference between the real-time temperature and the preset temperature.

[0070] In this embodiment, the heating unit 132 is automatically controlled by the main controller 6.

[0071] In a specific embodiment, the water heater further includes a water inlet assembly 7 and a water outlet assembly 8. The water inlet assembly 7 includes a water inlet connector 71, which is connected to a water inlet 114 located at the bottom of the heat exchange housing 11 via a water inlet pipe 72. The water outlet assembly 8 includes a water outlet pipe 81 connected to the secondary heat exchanger 4, which is connected to a water outlet connector 82 located on the outer casing 2.

[0072] In a specific embodiment, the bottom of the heat exchange shell 11 is provided with a water outlet 115, and the water outlet 115 is connected to the heat exchange tube 41 of the secondary heat exchanger 4 through a heat exchange water outlet pipe 116.

[0073] More specifically, the inlet 114 of the heat exchange component 12 and the inlet connector 71 of the water heater are connected by an inlet pipe 72; the outlet 115 of the heat exchange component 12 is connected by an outlet pipe 116 and the inlet of the heat exchange tube 41 of the secondary heat exchanger 4.

[0074] During operation, cold water enters the heat exchange tube of the heat exchange component 12 through the inlet connector 71 and the inlet pipe 72, and then enters the heat exchange tube 41 of the secondary heat exchanger 4. After being heated in the water heater, the water flows out from the outlet connector 82 through the outlet pipe 81.

[0075] When the water heater stops supplying hot water, condensate generated due to temperature difference within the condenser heat exchanger structure 1 will drip onto the bottom surface of the heat exchanger housing 11. If the ambient temperature is very low, below 0°C (freezing point), the condensate will freeze and may block the drain outlet 113. The condensate generated during the next use will not be able to drain and will backflow through the air inlet 1111 of the condenser heat exchanger structure 1 into the fan 5 and then into the water heater, corroding some components and creating a safety hazard. In this embodiment, the temperature sensor, when sensing that the temperature at the bottom of the heat exchanger housing is below 2°C, will send a signal to the main controller 6. The main controller 6 will then activate the heating unit 132 to heat the surface of the heating chamber 112, raising the temperature and maintaining it above 2°C. This ensures that the generated condensate remains in a liquid state and is discharged from the unit at any time, meaning the condensate will never freeze.

[0076] In this embodiment, because the lower part of the heating chamber 112 has an antifreeze function, the heating chamber 112 is always kept above 2°C. There is no ice in the heating chamber 112, and it will not absorb the heat of the condenser heat exchanger structure 1 due to the melting of ice when it is used again, thus greatly improving the heat exchange efficiency.

[0077] The water heater provided in this embodiment adopts antifreeze technology, which can keep the condensate in a fluid state without freezing and discharge it at any time. It can also greatly improve thermal efficiency and is easier to manufacture with lower manufacturing costs.

[0078] Example 3

[0079] This embodiment provides a heat exchanger control method for controlling the water heater described in Embodiment 2. The antifreeze component 13 in the water heater includes a temperature acquisition unit 131 and a heating unit 132. The water heater includes a main controller 6, and the main controller 6 is connected to both the temperature acquisition unit 131 and the heating unit 132. Figure 8 As shown, the control method includes:

[0080] Step 1: The temperature acquisition unit 131 acquires the real-time temperature of the condensate in the heating chamber 112 and transmits it to the main controller 6.

[0081] Step 2: The main controller 6 receives the real-time temperature of the condensate and compares it with the preset temperature preset in the main controller 6.

[0082] Step 3: The main controller 6 controls the working state of the heating unit 132 based on the comparison results.

[0083] In a specific embodiment, in step three, the main controller 6 controls the working state of the heating unit 132 according to the comparison result, specifically: when the real-time temperature is greater than or equal to the preset temperature, the heating unit 132 does not work; conversely, when the real-time temperature is less than the preset temperature, the heating unit 132 works.

[0084] The preset temperature is 1-3℃, preferably 2℃.

[0085] In this embodiment, a temperature sensor and a heating unit are installed near the bottom of the condenser heat exchanger structure 1. When the temperature sensor detects that the condenser temperature is below 2°C (close to the freezing point), it sends a signal to the main controller 6 of the water heater. The main controller 6 then activates the heating unit to heat the water, ensuring that the bottom of the heat exchanger is always kept above 2°C. The control method provided in this embodiment ensures that the condensate remains in a fluid state, preventing the condensate drain from becoming blocked due to freezing.

[0086] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous technical features can be freely combined and superimposed.

[0087] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A water heater, characterized in that, The water heater includes a condensing heat exchanger structure, which comprises a heat exchange shell, a heat exchange component, and an antifreeze component. The heat exchange shell has an upper heat exchange chamber and a lower heating chamber. The heat exchange component is located within the heat exchange chamber, and the antifreeze component is located within the heating chamber. The condensate generated by the heat exchange component can drip into the heating chamber. The bottom of the heat exchange shell has a drain port, which communicates with the heating chamber to discharge the condensate collected in the heating chamber. The antifreeze component includes a temperature acquisition unit and a heating unit, both of which are located at the bottom of the heating chamber; the temperature acquisition unit can acquire the real-time temperature of the condensate in the heating chamber, and the heating unit can operate or not operate based on the real-time temperature. Along the direction from away from the center to closer to the center, the bottom of the heat exchange shell gradually slopes downward, so that the condensate in the heating chamber can collect at the center of the heat exchange shell; the discharge port is located at the center of the heat exchange shell; The heating unit is a heating coil covering the bottom surface of the heat exchange housing; and the distance between adjacent heating coils gradually decreases along the direction from away from the center to closer to the center. The water heater also includes a shell, a burner, a secondary heat exchanger, and a fan. The condensing heat exchanger structure, the burner, the secondary heat exchanger, and the fan are all housed inside the shell. The burner heats the secondary heat exchanger, and the flue gas generated by the secondary heat exchanger enters the condensing heat exchanger structure after passing through the fan. The water heater also includes a main controller, which has a preset temperature. When the antifreeze component includes a temperature acquisition unit and a heating unit, the main controller is connected to the temperature acquisition unit to receive the real-time temperature acquired by the temperature acquisition unit. The main controller is also connected to the heating unit to control the working state of the heating unit based on the difference between the real-time temperature and the preset temperature. The preset temperature is 2°C.

2. The water heater according to claim 1, characterized in that, The temperature acquisition unit includes a temperature sensor.

3. The water heater according to claim 1, characterized in that, The heat exchange chamber has an air inlet on one side, which is connected to the air outlet of the fan; the heat exchange chamber has an air outlet at the top, which extends out of the outer shell and is connected to the exhaust pipe of the water heater.

4. The water heater according to claim 3, characterized in that, The water heater also includes an inlet assembly and an outlet assembly. The inlet assembly includes an inlet connector, which is connected to an inlet port located at the bottom of the heat exchange housing via an inlet pipe. The outlet assembly includes an outlet pipe connected to the secondary heat exchanger, which is connected to an outlet connector located on the outer casing.

5. A heat exchanger control method, characterized in that, The control method is used to control the water heater according to any one of claims 1-4, wherein the antifreeze component in the water heater includes a temperature acquisition unit and a heating unit, the water heater includes a main controller, and the main controller is connected to both the temperature acquisition unit and the heating unit; the control method includes: Step 1: The temperature acquisition unit acquires the real-time temperature of the condensate in the heating chamber and transmits it to the main controller. Step 2: The main controller receives the real-time temperature of the condensate and compares it with the preset temperature preset in the main controller. Step 3: The main controller controls the working state of the heating unit based on the comparison results.

6. The heat exchanger control method according to claim 5, characterized in that, In step three, the main controller controls the working state of the heating unit based on the comparison result. Specifically, when the real-time temperature is greater than or equal to the preset temperature, the heating unit does not work; conversely, when the real-time temperature is less than the preset temperature, the heating unit works.

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