Anti-freezing control method of water heater and water heater

Abstract

The invention relates to the technical field of water heaters, and discloses an anti-freezing control method of a water heater and the water heater. The anti-freezing control method of the water heater comprises the steps that the detection temperature of a temperature detection structure of the water heater is obtained in real time, and the detection liquid level of a liquid level detection structure of the water heater is obtained; according to the comparison result of the detection temperature and the first preset temperature and the comparison result of the detection liquid level and the preset liquid level, starting and stopping of a combustion assembly of the water heater are controlled; wherein the first preset temperature is a freezing critical value of the water heater, and the preset liquid level is a safe liquid level critical value of the water heater. According to the anti-freezing control method of the water heater, dry burning can be avoided when ignition heating anti-freezing measures are adopted.

Description

Technical Field

[0001] The invention relates to the technical field of water heaters, and in particular to an antifreeze control method for a water heater and a water heater. Background Art

[0002] When a water heater is used in cold winter, effective antifreeze measures are usually required to prevent the water in the heat exchanger and pipes of the water heater from freezing at low temperatures, thereby causing the heat exchanger and pipes to freeze and crack.

[0003] The antifreeze measures of related technologies mainly include: manual drainage antifreeze, installation of cold wind backflow prevention device at the exhaust pipe, electric auxiliary heating antifreeze, ignition heating antifreeze, etc. Among them, when the ignition heating antifreeze measure is used on conventional gas water heaters, it is easy to cause dry burning of the heat exchanger, thereby damaging the gas water heater. Summary of the invention

[0004] In view of this, the present invention provides a water heater antifreeze control method and a water heater to solve the problem that when using ignition heating antifreeze measures on conventional polarity gas water heaters, the heat exchanger is easily burned dry, thereby damaging the gas water heater.

[0005] In a first aspect, the present invention provides an antifreeze control method for a water heater, comprising:

[0006] Acquire the detected temperature of the temperature detection structure of the water heater in real time, and acquire the detected liquid level of the liquid level detection structure of the water heater;

[0007] Controlling the start and stop of the combustion component of the water heater according to the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level;

[0008] Wherein, the first preset temperature is the freezing critical value of the water heater, and the preset liquid level is the safety liquid level critical value of the water heater.

[0009] Beneficial effect: The start and stop of the combustion component can be controlled according to the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level. It can be discovered in time when the detected temperature is low (freezing critical value), so as to heat the water heater in time to prevent the heat exchanger 1 of the water heater and the liquid in the pipeline from freezing at low temperature, and avoid the heat exchanger 1 and the pipeline of the water heater from freezing and cracking; and the liquid level can be detected to obtain whether there is a lack of water in the heat exchanger 1 and the pipeline (it is considered to be lack of water if it is lower than the safety liquid level critical value), so as to avoid dry burning caused by heating the water heater when there is a lack of water, and avoid damage to the water heater due to dry burning.

[0010] In an optional implementation, controlling the start and stop of the combustion component of the water heater according to the detected temperature and the detected liquid level includes:

[0011] Determining whether the detected temperature is lower than a first preset temperature;

[0012] If it is lower than the first preset temperature, it is determined whether the detected liquid level is higher than or equal to the preset liquid level, and if it is higher than or equal to the preset liquid level, the combustion component is controlled to start; if it is lower than the preset liquid level, the combustion component is controlled to remain closed;

[0013] If the temperature is higher than or equal to the first preset temperature, the combustion component is controlled to remain closed.

[0014] Beneficial effects: first judge the detected temperature and the first preset temperature, and when the detected temperature is lower than the first preset temperature, control the start-up or shutdown of the combustion component according to the judgment result between the detected liquid level and the preset liquid level, to ensure that the combustion component is started only when the detected temperature is lower than the first preset temperature and the detected liquid level is higher than or equal to the first preset temperature, which can avoid freezing of the liquid in the heat exchanger and the pipeline at low temperature and dry burning; ensure that the combustion component remains in a closed state when the detected temperature is lower than the first preset temperature and the detected liquid level is lower than the preset liquid level, to prevent dry burning caused by the start of the combustion component; ensure that the combustion component remains in a closed state when the detected temperature is higher than or equal to the first preset temperature, and there is no need to start the combustion component when the temperature is high, to avoid energy waste.

[0015] In an optional embodiment, after the combustion component is started, the method further includes:

[0016] Determining whether the detected temperature is higher than a second preset temperature;

[0017] If it is higher than the second preset temperature, the combustion component is controlled to be closed;

[0018] If it is lower than or equal to the second preset temperature, it is determined whether the detected liquid level is higher than or equal to the preset liquid level. If it is higher than or equal to the preset liquid level, the combustion component is controlled to remain started; if it is lower than the preset liquid level, the combustion component is controlled to be shut down.

[0019] Beneficial effect: After the combustion component is started and the water heater is heated, the detection temperature is still obtained in real time and judged. When the detection temperature is higher than the second preset temperature, it means that the temperature of the water heater has reached the appropriate temperature, and the liquid in the heat exchanger and pipeline of the water heater will not freeze at low temperature, and the combustion component does not need to continue heating. When the detection temperature is lower than the second preset temperature, it means that heating needs to continue. If heating continues, the detection liquid level needs to be considered at the same time. When it is higher than or equal to the preset liquid level, the combustion component is controlled to keep started to continue heating. When it is lower than the preset liquid level, the combustion component is controlled to be closed to prevent dry burning.

[0020] In an optional implementation, the first preset temperature T1 satisfies, 1°C≤T1≤5°C.

[0021] Beneficial effect: The first preset temperature satisfies 1°C≤T1≤5°C, and the liquid in the heat exchanger and the pipeline will not begin to freeze due to the temperature being too low, nor will the heating be started too early due to the temperature being too high, causing a waste of resources.

[0022] In an optional implementation, the second preset temperature T2 satisfies, 15°C≤T2≤30°C.

[0023] Beneficial effect: During the continuous heating of the combustion component, when the second preset temperature T2 satisfies 15℃≤T2≤30℃, it means that during the continuous heating of the combustion component, the liquid temperature in the heat exchanger and the pipeline has risen to a safe temperature range. At this time, the heating can be stopped to avoid dry burning of the heat exchanger and the pipeline, which may cause damage to the water heater.

[0024] In a second aspect, the present invention further provides a water heater, comprising:

[0025] Heat exchangers;

[0026] A detection structure, comprising a temperature detection structure and a liquid level detection structure, wherein the temperature detection structure is used to detect the temperature of the liquid in the heat exchanger; and the liquid level detection structure is used to detect the liquid level in the heat exchanger;

[0027] a combustion assembly, for heating the liquid in the heat exchanger;

[0028] A controller is communicatively connected with the temperature detection structure, the liquid level detection structure and the combustion assembly, and is used to execute the above-mentioned antifreeze control method for the water heater.

[0029] In an optional implementation, the temperature detection structure is disposed on the top of the heat exchanger.

[0030] Beneficial effects: A fan is usually installed above the heat exchanger of the water heater. When the water heater is working normally, the fan discharges the combustion exhaust gas through the exhaust pipe and provides air for the combustion of the combustion components to prevent carbon monoxide poisoning. When the water heater is not in use, the outside air can first reach the top of the heat exchanger through the exhaust pipe of the fan, then reach the burner and other structures, and finally reach the entire water heater. Therefore, the temperature at the top of the heat exchanger is usually lower than other positions, and the cold wind can be felt faster. The temperature detection structure is set at the top of the heat exchanger, which can obtain the detection temperature of the heat exchanger more timely and accurately, so as to take antifreeze measures for the water heater in time.

[0031] In an optional implementation, the liquid level detection structure is disposed on the top of the heat exchanger.

[0032] Beneficial effect: The liquid level detection structure is arranged on the top of the heat exchanger, which can ensure that the corresponding preset liquid level can be a higher liquid level, ensure that there is sufficient liquid in the heat exchanger and pipeline, and avoid dry burning of the top of the heat exchanger caused by a low preset liquid level.

[0033] In an optional embodiment, the heat exchanger includes a heat exchanger body and a heat exchange tube, the heat exchange tube is connected to the outer periphery of the heat exchanger body, and the temperature detection structure and the liquid level detection structure are both connected to the heat exchange tube.

[0034] Beneficial effects: The temperature detection structure and the liquid level detection structure are both connected to the heat exchange tube, which can avoid the modification of the heat exchanger body. The difficulty of modifying the heat exchange tube is relatively low, and the connection and fixation of the temperature detection structure and the liquid level detection structure are also relatively easy.

[0035] In an optional embodiment, the water heater further comprises a connection structure, and the temperature detection structure and the liquid level detection structure are fixedly connected to the heat exchange tube via the connection structure.

[0036] Beneficial effect: The connection structure can fix the temperature detection structure and the liquid level detection structure on the heat exchange tube.

[0037] In an optional embodiment, the detection structure includes a detection body and a limiting convex portion protruding from the periphery of the detection body; the connection structure includes:

[0038] A fixing seat, fixedly connected to the heat exchange tube, the fixing seat is provided with two through holes, the through holes are communicated with the interior of the heat exchange tube; the detection body of the temperature detection structure extends to the interior of the heat exchange tube through one of the through holes, and the detection body of the liquid level detection structure extends to the interior of the heat exchange tube through the other through hole;

[0039] The limiting plate is detachably connected to the fixing seat, and the limiting protrusion is clamped between the fixing seat and the limiting plate.

[0040] Beneficial effects: The detachable connection between the fixing seat and the limiting plate can realize the detachable connection of the detection structure, which is convenient for replacement and maintenance of the detection structure. The setting of the through hole can make the detection body of the detection structure extend into the heat exchange tube through the through hole for detection; the setting of the limiting convex part can facilitate the limiting and fixing of the detection structure through the fixing seat and the limiting plate.

[0041] In an optional embodiment, the connection structure further includes a sealing member, and the sealing member is sealingly sleeved on the outer periphery of the detection body and clamped between the fixing seat and the limiting protrusion.

[0042] Beneficial effect: The seal can achieve sealing between the detection structure and the heat exchange tube, preventing the liquid in the heat exchange tube from overflowing through the through hole.

[0043] In an optional embodiment, the through hole includes a first hole segment and a second hole segment arranged in sequence, the aperture of the first hole segment is larger than the aperture of the second hole segment, the detection body passes through the first hole segment and the second hole segment in sequence and extends into the heat exchange tube, the seal and the limiting protrusion are both arranged in the first hole segment; in the axial direction of the through hole, the sum of the heights of the seal and the limiting protrusion is greater than or equal to the length of the first hole segment.

[0044] Beneficial effect: A step can be formed between the first hole segment and the second hole segment, and the seal can be limitedly clamped between the step and the limiting convex portion, which has a better sealing effect. In the axial direction of the through hole, the sum of the heights of the seal and the limiting convex portion is greater than or equal to the length of the first hole segment, which can ensure the stability of the seal and the detection structure and avoid movement and dislocation in the axial direction.

[0045] In an optional embodiment, a first avoidance groove and a second avoidance groove are further provided on the limit plate, and the end of the detection body of the temperature detection structure away from the heat exchange tube is arranged at the first avoidance groove; the end of the detection body of the liquid level detection structure away from the heat exchange tube is arranged at the second avoidance groove.

[0046] Beneficial effect: The first avoidance groove can avoid the detection body of the temperature detection structure to avoid damage to it. The second avoidance groove can avoid the detection body of the liquid level detection structure to avoid damage to it.

[0047] In an optional embodiment, at least two first connecting holes are provided on the fixing seat, and at least two second connecting holes are correspondingly provided on the limiting plate. The connecting structure also includes a fastener, and the first connecting hole and the second connecting hole are detachably connected by the fastener.

[0048] Beneficial effects: The detachable connection between the first connecting hole, the second connecting hole and the fastener can simplify the connection and disassembly between the fixing seat and the limiting plate, and facilitate the installation and disassembly of the detection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 A flow chart of an antifreeze control method for a water heater according to an embodiment of the present invention;

[0051] Figure 2 Another flow chart of an antifreeze control method for a water heater according to an embodiment of the present invention;

[0052] Figure 3 Another flow chart of an antifreeze control method for a water heater according to an embodiment of the present invention;

[0053] Figure 4 Another flow chart of an antifreeze control method for a water heater according to an embodiment of the present invention;

[0054] Figure 5 A schematic diagram of a heat exchanger of a water heater according to an embodiment of the present invention;

[0055] Figure 6 for Figure 5 A partial enlarged view of middle A;

[0056] Figure 7 An exploded view of the installation of a detection structure of a water heater according to an embodiment of the present invention;

[0057] Figure 8 A schematic diagram of a detection structure of a water heater according to an embodiment of the present invention from one viewing angle;

[0058] Fig. 9 for Figure 8 Cross-sectional view in the middle XX direction;

[0059] Fig.10A schematic diagram of a detection structure of a water heater according to an embodiment of the present invention from another perspective.

[0060] Description of reference numerals:

[0061] 1. Heat exchanger; 11. Heat exchanger body; 12. Heat exchange tube;

[0062] 21. Temperature detection structure; 22. Liquid level detection structure; 23. Detection body; 24. Position limiting convex part; 25. Connection line;

[0063] 3. Connection structure; 31. Fixing seat; 311. Through hole; 312. First connection hole;

[0064] 32. Limiting plate; 321. First avoidance groove; 322. Second avoidance groove; 323. Second connecting hole; 33. Sealing member; 34. Fastener. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0066] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0067] According to an embodiment of the present invention, on the one hand, a method for controlling the antifreeze of a water heater is provided, comprising:

[0068] S1, obtaining the detected temperature of the temperature detection structure 21 of the water heater in real time, and obtaining the detected liquid level of the liquid level detection structure 22 of the water heater;

[0069] S2. Controlling the start and stop of the combustion component of the water heater according to the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level;

[0070] Wherein, the first preset temperature is the freezing critical value of the water heater, and the preset liquid level is the safety liquid level critical value of the water heater.

[0071] The start and stop of the combustion component are controlled based on the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level. It can be discovered in time when the detected temperature is low (freezing critical value) so as to heat the water heater in time to prevent the heat exchanger 1 of the water heater and the liquid in the pipeline from freezing at low temperature, thereby avoiding freezing and cracking of the heat exchanger 1 and the pipeline of the water heater. The liquid level can also be detected to determine whether there is a lack of water in the heat exchanger 1 and the pipeline (a lack of water is considered when the liquid level is lower than the safety liquid level critical value), thereby avoiding dry burning caused by heating the water heater when there is a lack of water, thereby avoiding damage to the water heater due to dry burning.

[0072] In a specific implementation manner, the water heater of this embodiment is a gas water heater.

[0073] In one embodiment, the starting and shutting down of the combustion component of the water heater is controlled according to the detected temperature and the detected liquid level, including:

[0074] S201, determining whether the detected temperature is lower than a first preset temperature;

[0075] S202, if it is lower than the first preset temperature, determining whether the detected liquid level is higher than or equal to the preset liquid level, if it is higher than or equal to the preset liquid level, controlling the combustion component to start; if it is lower than the preset liquid level, controlling the combustion component to remain closed;

[0076] S203: If the temperature is higher than or equal to the first preset temperature, control the combustion component to remain closed.

[0077] The detected temperature and the first preset temperature are first judged. When the detected temperature is lower than the first preset temperature, the combustion component is controlled to start or remain closed according to the judgment result between the detected liquid level and the preset liquid level, to ensure that the combustion component is started only when the detected temperature is lower than the first preset temperature and the detected liquid level is higher than or equal to the first preset temperature, which can prevent the liquid in the heat exchanger 1 and the pipeline from freezing at low temperatures and dry burning; ensure that the combustion component remains in a closed state when the detected temperature is lower than the first preset temperature and the detected liquid level is lower than the preset liquid level, to prevent dry burning caused by the start of the combustion component; ensure that the combustion component remains in a closed state when the detected temperature is higher than or equal to the first preset temperature, and there is no need to start the combustion component when the temperature is high, to avoid energy waste.

[0078] Specifically, when the detected temperature is lower than the first preset temperature, it means that the current temperature is too low and effective antifreeze measures need to be taken immediately to prevent the heat exchanger 1 and the pipeline from freezing. When the detected liquid level is higher than or equal to the preset liquid level, it means that the heat exchanger 1 and the pipeline are full of liquid. At this time, the combustion component of the water heater starts to ignite and heat to effectively prevent freezing, and will not dry-burn the heat exchanger 1 and the pipeline. When the detected liquid level is lower than the preset liquid level, it means that there is a lack of water in the heat exchanger 1 and the pipeline. In the state of lack of water, the low temperature will not cause the pipeline to freeze and crack, and the water heater at this time does not need to execute the antifreeze control method of the water heater in this embodiment.

[0079] In one embodiment, after the combustion assembly is started, the method further comprises:

[0080] S204, determining whether the detected temperature is higher than a second preset temperature;

[0081] S205, if it is higher than the second preset temperature, controlling the combustion component to close;

[0082] S206. If it is lower than or equal to the second preset temperature, determine whether the detected liquid level is higher than or equal to the preset liquid level. If it is higher than or equal to the preset liquid level, control the combustion component to remain started; if it is lower than the preset liquid level, control the combustion component to be shut down.

[0083] After the combustion component starts and heats the water heater, the detection temperature is still obtained in real time and judged. When the detection temperature is higher than the second preset temperature, it means that the temperature of the water heater has reached a suitable temperature, and the heat exchanger 1 of the water heater and the liquid in the pipeline will not freeze at low temperatures, and the combustion component does not need to continue heating. When the detection temperature is lower than the second preset temperature, it means that heating needs to continue. If heating continues, the detection liquid level needs to be considered at the same time. When it is higher than or equal to the preset liquid level, the combustion component is controlled to remain started to continue heating. When it is lower than the preset liquid level, the combustion component is controlled to be closed to prevent dry burning.

[0084] Specifically, when the detected temperature is higher than the second preset temperature, it means that during the continuous heating process of the combustion component, the temperature of the liquid in the heat exchanger 1 and the pipeline has risen to a safe temperature range. At this time, heating can be stopped to avoid dry burning of the heat exchanger 1 and the pipeline, which may cause damage to the water heater.

[0085] As a convertible implementation, the starting and shutting down of the combustion component of the water heater can be controlled according to the detected temperature and the detected liquid level, including:

[0086] Determining whether the detected liquid level is higher than or equal to a preset liquid level;

[0087] If it is higher than or equal to the preset liquid level, it is determined whether the detected temperature is lower than the first preset temperature. If it is lower than the first preset temperature, the combustion component is controlled to start; if it is higher than or equal to the first preset temperature, the combustion component is controlled to remain closed;

[0088] If the liquid level is below the preset level, the combustion component is controlled to remain closed.

[0089] In one embodiment, the first preset temperature T1 satisfies 1°C≤T1≤5°C.

[0090] The first preset temperature satisfies 1°C≤T1≤5°C, so that the liquid in the heat exchanger 1 and the pipeline will not freeze due to the temperature being too low, nor will heating be started too early due to the temperature being too high, causing a waste of resources.

[0091] In a specific embodiment, the first preset temperature T1 is 1°C.

[0092] Specifically in another embodiment, the first preset temperature T1 is 5°C.

[0093] Specifically in another embodiment, the first preset temperature T1 is 3°C.

[0094] In one embodiment, the second preset temperature T2 satisfies 15°C≤T2≤30°C.

[0095] During the continuous heating of the combustion component, when the second preset temperature T2 satisfies 15℃≤T2≤30℃, it means that during the continuous heating of the combustion component, the temperature of the liquid in the heat exchanger 1 and the pipeline has risen to a safe temperature range. At this time, the heating can be stopped to avoid dry burning of the heat exchanger 1 and the pipeline, which may cause damage to the water heater.

[0096] According to an embodiment of the present invention, on the other hand, a water heater is provided, comprising a heat exchanger 1, a detection structure, a combustion component and a controller; the detection structure comprises a temperature detection structure 21 and a liquid level detection structure 22, the temperature detection structure 21 is used to detect the temperature of the liquid in the heat exchanger 1; the liquid level detection structure 22 is used to detect the liquid level in the heat exchanger 1; the combustion component is used to heat the liquid in the heat exchanger 1; the controller is connected to the temperature detection structure 21, the liquid level detection structure 22 and the combustion component in communication, and is used to execute the above-mentioned antifreeze control method for the water heater. The above-mentioned antifreeze control method for the water heater comprises:

[0097] S1, obtaining the detected temperature of the temperature detection structure 21 of the water heater in real time, and obtaining the detected liquid level of the liquid level detection structure 22 of the water heater;

[0098] S2. Controlling the start and stop of the combustion component of the water heater according to the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level;

[0099] Wherein, the first preset temperature is the freezing critical value of the water heater, and the preset liquid level is the safety liquid level critical value of the water heater.

[0100] The start and stop of the combustion component can be controlled according to the real-time acquired detection temperature and detection liquid level, so that it can be discovered in time when the detection temperature is low so as to heat the water heater in time to prevent the liquid in the heat exchanger 1 and the pipeline of the water heater from freezing at low temperature, thereby avoiding the heat exchanger 1 and the pipeline of the water heater from freezing and cracking; and the liquid level can be detected to determine whether there is a lack of water in the heat exchanger 1 and the pipeline, thereby avoiding dry burning caused by heating the water heater when there is a lack of water, thereby avoiding damage to the water heater due to dry burning.

[0101] In one embodiment, the temperature detection structure 21 is disposed on the top of the heat exchanger 1 .

[0102] A fan is usually installed above the heat exchanger 1 of the water heater. When the water heater is working normally, the fan discharges the combustion exhaust gas through the exhaust pipe and provides air for the combustion of the combustion component to prevent carbon monoxide poisoning. When the water heater is not in use, the outside air can first reach the top of the heat exchanger 1 through the exhaust pipe of the fan, then reach the burner and other structures, and finally reach the entire water heater. Therefore, the temperature at the top of the heat exchanger 1 is usually lower than other positions, and the cold wind can be felt faster. The temperature detection structure 21 is set at the top of the heat exchanger 1, and the detection temperature of the heat exchanger 1 can be obtained more timely and accurately, so that antifreeze measures can be taken for the water heater in time.

[0103] In one embodiment, the liquid level detection structure 22 is disposed on the top of the heat exchanger 1 .

[0104] The liquid level detection structure 22 is arranged at the top of the heat exchanger 1, which can ensure that the corresponding preset liquid level can be a higher liquid level, ensure that there is sufficient liquid in the heat exchanger 1 and the pipeline, and avoid dry burning of the top of the heat exchanger 1 caused by a low preset liquid level.

[0105] In one embodiment, the heat exchanger 1 includes a heat exchanger body 11 and a heat exchange tube 12 , the heat exchange tube 12 is connected to the outer periphery of the heat exchanger body 11 , and the temperature detection structure 21 and the liquid level detection structure 22 are both connected to the heat exchange tube 12 .

[0106] The temperature detection structure 21 and the liquid level detection structure 22 are both connected to the heat exchange tube 12, which can avoid modifying the heat exchanger body 11. The difficulty of modifying the heat exchange tube 12 is relatively low, and the connection and fixation of the temperature detection structure 21 and the liquid level detection structure 22 are also relatively easy.

[0107] In a preferred embodiment, the temperature detection structure 21 and the liquid level detection structure 22 are connected to be located on a curved pipe at the top of the heat exchanger body.

[0108] In a preferred embodiment, the temperature detection structure 21 is a temperature probe, and the liquid level detection structure 22 is a liquid level probe.

[0109] In one embodiment, the water heater further includes a connection structure 3 , and the temperature detection structure 21 and the liquid level detection structure 22 are fixedly connected to the heat exchange tube 12 via the connection structure 3 .

[0110] The connection structure 3 can fix the temperature detection structure 21 and the liquid level detection structure 22 on the heat exchange tube 12 .

[0111] In one embodiment, the detection structure includes a detection body 23 and a limiting protrusion 24 protruding from the outer periphery of the detection body 23; the connection structure 3 includes a fixed seat 31 and a limiting plate 32; the fixed seat 31 is fixedly connected to the heat exchange tube 12, and the fixed seat 31 is provided with two through holes 311, and the through holes 311 are connected to the interior of the heat exchange tube 12; the detection body 23 of the temperature detection structure 21 extends to the interior of the heat exchange tube 12 through one of the through holes 311, and the detection body 23 of the liquid level detection structure 22 extends to the interior of the heat exchange tube 12 through another through hole 311; the limiting plate 32 is detachably connected to the fixed seat 31, and the limiting protrusion 24 is clamped between the fixed seat 31 and the limiting plate 32.

[0112] The detachable connection between the fixing seat 31 and the limiting plate 32 can realize the detachable connection of the detection structure, which is convenient for replacement and maintenance of the detection structure. The setting of the through hole 311 can allow the detection body 23 of the detection structure to extend into the heat exchange tube 12 through the through hole 311 for detection; the setting of the limiting protrusion 24 can facilitate the limiting and fixing of the detection structure through the fixing seat 31 and the limiting plate 32.

[0113] In one embodiment, the connection structure 3 further includes a sealing member 33 , which is sealingly sleeved on the outer periphery of the detection body 23 and clamped between the fixing seat 31 and the limiting protrusion 24 .

[0114] The seal 33 can achieve sealing between the detection structure and the heat exchange tube 12 to prevent the liquid in the heat exchange tube 12 from overflowing through the through hole 311 .

[0115] Preferably, the sealing member 33 is an elastic sealing ring.

[0116] In one embodiment, the through hole 311 includes a first hole segment and a second hole segment which are arranged in sequence, the aperture of the first hole segment is larger than the aperture of the second hole segment, the detection body 23 passes through the first hole segment and the second hole segment in sequence and extends into the heat exchange tube 12, the seal 33 and the limiting protrusion 24 are both arranged in the first hole segment; in the axial direction of the through hole 311, the sum of the heights of the seal 33 and the limiting protrusion 24 is greater than or equal to the length of the first hole segment.

[0117] A step may be formed between the first hole section and the second hole section, and the seal 33 may be limitedly clamped between the step and the limiting protrusion 24, which has a better sealing effect. In the axial direction of the through hole 311, the sum of the heights of the seal 33 and the limiting protrusion 24 is greater than or equal to the length of the first hole section, which can ensure the stability of the seal 33 and the detection structure and avoid movement and dislocation in the axial direction.

[0118] As a convertible implementation, an annular groove may be provided on the inner wall of the through hole 311 , the sealing member 33 is disposed in the annular groove and protrudes from the notch of the annular groove, and the protruding portion is interference fit with the detection body 23 .

[0119] In one embodiment, a first avoidance groove 321 and a second avoidance groove 322 are further provided on the limit plate 32, and the end of the detection body 23 of the temperature detection structure 21 away from the heat exchange tube 12 is arranged at the first avoidance groove 321; the end of the detection body 23 of the liquid level detection structure 22 away from the heat exchange tube 12 is arranged at the second avoidance groove 322.

[0120] The first avoidance groove 321 can avoid the detection body 23 of the temperature detection structure 21 to avoid damage to it. The second avoidance groove 322 can avoid the detection body 23 of the liquid level detection structure 22 to avoid damage to it.

[0121] Specifically, the detection structure further includes a connecting line 25 , one end of which is connected to the detection body 23 , and the other end of which can be connected to the controller.

[0122] In one embodiment, at least two first connection holes 312 are provided on the fixing seat 31, and at least two second connection holes 323 are correspondingly provided on the limiting plate 32. The connecting structure 3 also includes a fastener 34, and the first connection hole 312 and the second connection hole 323 are detachably connected through the fastener 34.

[0123] The detachable connection between the first connection hole 312 , the second connection hole 323 and the fastener 34 can simplify the connection and disassembly between the fixing seat 31 and the limiting plate 32 , and facilitate the installation and disassembly of the detection structure.

[0124] Specifically, the fastener 34 may be a fastening structure such as a screw or a bolt.

[0125] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present application.

Claims

1. A method for controlling the antifreeze of a water heater, characterized in that: include: Acquiring in real time the detected temperature of the temperature detection structure (21) of the water heater, and acquiring the detected liquid level of the liquid level detection structure (22) of the water heater; Controlling the start and stop of the combustion component of the water heater according to the comparison result between the detected temperature and the first preset temperature, and the comparison result between the detected liquid level and the preset liquid level; Wherein, the first preset temperature is the freezing critical value of the water heater, and the preset liquid level is the safety liquid level critical value of the water heater.

2. The antifreeze control method for a water heater according to claim 1, characterized in that: The method of controlling the start and stop of the combustion component of the water heater according to the detected temperature and the detected liquid level comprises: Determining whether the detected temperature is lower than the first preset temperature; If it is lower than the first preset temperature, it is determined whether the detected liquid level is higher than or equal to the preset liquid level, and if it is higher than or equal to the preset liquid level, the combustion component is controlled to start; if it is lower than the preset liquid level, the combustion component is controlled to remain closed; If the temperature is higher than or equal to the first preset temperature, the combustion component is controlled to remain closed.

3. The antifreeze control method for a water heater according to claim 2, characterized in that: After the combustion component is started, the control further includes: Determining whether the detected temperature is higher than a second preset temperature; If it is higher than the second preset temperature, the combustion component is controlled to be closed; If it is lower than or equal to the second preset temperature, it is determined whether the detected liquid level is higher than or equal to the preset liquid level. If it is higher than or equal to the preset liquid level, the combustion component is controlled to remain started; if it is lower than the preset liquid level, the combustion component is controlled to be shut down.

4. The antifreeze control method for a water heater according to claim 2, characterized in that: The first preset temperature T1 satisfies 1°C≤T1≤5°C.

5. The antifreeze control method for a water heater according to claim 3, characterized in that: The second preset temperature T2 satisfies 15°C≤T2≤30°C.

6. A water heater, characterized in that: include: Heat exchanger (1); A detection structure, comprising a temperature detection structure (21) and a liquid level detection structure (22), wherein the temperature detection structure (21) is used to detect the temperature of the liquid in the heat exchanger (1); and the liquid level detection structure (22) is used to detect the liquid level in the heat exchanger (1); A combustion component, used for heating the liquid in the heat exchanger (1); A controller is communicatively connected with the temperature detection structure (21), the liquid level detection structure (22) and the combustion component, and is used to execute the antifreeze control method for the water heater according to any one of claims 1 to 5.

7. The water heater according to claim 6, characterized in that: The temperature detection structure (21) is arranged on the top of the heat exchanger (1); And / or, the liquid level detection structure (22) is arranged on the top of the heat exchanger (1).

8. The water heater according to claim 6 or 7, characterized in that: The heat exchanger (1) comprises a heat exchanger body (11) and a heat exchange tube (12); the heat exchange tube (12) is connected to the outer periphery of the heat exchanger body (11); and the temperature detection structure (21) and the liquid level detection structure (22) are both connected to the heat exchange tube (12).

9. The water heater according to claim 8, characterized in that: It also comprises a connection structure (3), wherein the temperature detection structure (21) and the liquid level detection structure (22) are fixedly connected to the heat exchange tube (12) via the connection structure (3).

10. The water heater according to claim 9, characterized in that The detection structure comprises a detection body (23) and a limiting protrusion (24) protruding from the outer periphery of the detection body (23); the connection structure (3) comprises: A fixing seat (31) fixedly connected to the heat exchange tube (12); the fixing seat (31) is provided with two through holes (311), the through holes (311) being in communication with the interior of the heat exchange tube (12); the detection body (23) of the temperature detection structure (21) extends into the interior of the heat exchange tube (12) through one of the through holes (311), and the detection body (23) of the liquid level detection structure (22) extends into the interior of the heat exchange tube (12) through the other through hole (311); The limiting plate (32) is detachably connected to the fixing seat (31), and the limiting protrusion (24) is sandwiched between the fixing seat (31) and the limiting plate (32).

11. The water heater according to claim 10, characterized in that The connection structure (3) further comprises a sealing member (33), wherein the sealing member (33) is sealingly sleeved on the outer periphery of the detection body (23) and is clamped between the fixing seat (31) and the limiting protrusion (24).

12. The water heater according to claim 11, characterized in that The through hole (311) includes a first hole segment and a second hole segment which are arranged in sequence, the aperture of the first hole segment is larger than the aperture of the second hole segment, the detection body (23) passes through the first hole segment and the second hole segment in sequence and extends into the heat exchange tube (12), the sealing member (33) and the limiting protrusion (24) are both arranged in the first hole segment; in the axial direction of the through hole (311), the sum of the heights of the sealing member (33) and the limiting protrusion (24) is greater than or equal to the length of the first hole segment.

13. The water heater according to claim 10, characterized in that The limiting plate (32) is also provided with a first avoidance groove (321) and a second avoidance groove (322); one end of the detection body (23) of the temperature detection structure (21) away from the heat exchange tube (12) is arranged at the first avoidance groove (321); and one end of the detection body (23) of the liquid level detection structure (22) away from the heat exchange tube (12) is arranged at the second avoidance groove (322).

14. The water heater according to claim 10, characterized in that The fixing seat (31) is provided with at least two first connection holes (312), and the limiting plate (32) is correspondingly provided with at least two second connection holes (323). The connection structure (3) further comprises a fastener (34), and the first connection hole (312) and the second connection hole (323) are detachably connected via the fastener (34).

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