Gas water heater and control method thereof

Abstract

The present invention discloses a gas water heater and a control method thereof, wherein the gas water heater includes a constant temperature control system and a water tank, and the constant temperature control system includes: a partition component, which divides the water tank into a first cavity and a second cavity, the first cavity being a hot water cavity, and the second cavity being a cold water cavity; a temperature detection device, which is used to detect the cold water inlet temperature and the hot water outlet temperature of the water tank; a drive device, which is used to drive the position of the partition component relative to the water tank body in the water tank; an inner circulation loop, in which the flow path of water between the gas water heater and the inside of the water tank constitutes the inner circulation loop; an outer circulation loop, in which the flow path of water between the outside of the gas water heater and the water use point constitutes the outer circulation loop; a control device, which controls the drive device to close the inner circulation loop and open the outer circulation loop when it is detected that the outlet water temperature is lower than a preset temperature; and to open the inner circulation loop and close the outer circulation loop when it is detected that the outlet water temperature is higher than the preset temperature.

Description

Technical Field

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

[0002] As people's living standards continue to improve, their pursuit of bathing comfort is becoming increasingly demanding. Gas water heaters, with their fast heating speeds and large water capacity, have become the preferred choice for many users. However, gas water heaters also have inherent drawbacks, such as large temperature fluctuations when water pressure is unstable, large temperature fluctuations when the water is turned off and on during use, and insufficient heat in winter and scalding water in summer. To address these shortcomings, some manufacturers typically install a water tank or water flow servo valve at the water outlet to ensure a constant water temperature when using a gas water heater.

[0003] However, since a water tank is added to the gas water heater, a large amount of water will remain in the water tank after the user uses the gas water heater and gradually turn into cold water in the water tank. When the user uses the gas water heater next time, the cold water retained in the water tank will mix with the hot water heated by the gas. At the same time, since there is more cold water in the water tank, the time it takes for the gas water heater to produce hot water will be extended. As a result, the hot water that flows out for a period of time after the user has just turned on the gas water heater is not the hot water set by the user, which brings a lot of inconvenience to the user's bathing experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the water tank of a gas water heater retains accumulated water, resulting in slow hot water flow when it is used again, and to provide a gas water heater and a control method thereof.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A gas water heater, comprising a constant temperature control system and a water tank, wherein the constant temperature control system comprises:

[0007] a partition assembly, wherein the partition assembly divides the water tank into a first cavity and a second cavity, wherein the first cavity is a hot water cavity and the second cavity is a cold water cavity;

[0008] a temperature detection device for detecting the cold water inlet temperature and the hot water outlet temperature of the water tank;

[0009] a driving device, the driving device being used to drive the partition assembly to move relative to the water tank;

[0010] An internal circulation loop, the water flow path between the gas water heater and the inside of the water tank constitutes the internal circulation loop;

[0011] An external circulation loop, the flow path of water between the outside of the gas water heater and the water point constitutes the external circulation loop;

[0012] a control device, wherein when the temperature detection device detects that the outlet water temperature is lower than a preset temperature, the control device controls the drive device to close the inner circulation loop and open the outer circulation loop; when the temperature detection device detects that the outlet water temperature is higher than a preset temperature, the control device controls the drive device to open the inner circulation loop and close the outer circulation loop;

[0013] Wherein, when the internal circulation loop is closed, the driving device drives the partition assembly to prevent the water in the second cavity from flowing into the first cavity;

[0014] When the internal circulation loop is opened, the driving device drives the partition assembly to allow the water in the second cavity to flow into the first cavity.

[0015] In this technical solution, the aforementioned structure is employed, with a partition assembly used to adjust the volume of the first chamber at different temperatures. After a user uses the gas water heater, the volume of the first chamber is reduced to reduce cold water residue, while the internal circulation loop is opened, thereby reducing water temperature fluctuations the next time hot water flows in. The next time the user uses the gas water heater, the volume of the first chamber is increased to increase the amount of hot water stored, while the external circulation loop is opened, thereby improving the gas water heater's ability to withstand water temperature fluctuations. This design effectively solves the problem of slow hot water flow from the gas water heater tank due to accumulated water, reducing user waiting time. It also improves water temperature comfort without changing the gas water heater's hot water flow rate.

[0016] Preferably, the partition assembly is provided with a one-way valve and a blocking member, one end of the blocking member is connected to the driving device, and the other end is connected to the one-way valve, the one-way valve includes a pressure relief channel, and the driving device drives the blocking member to open or close the pressure relief channel to allow or prevent water in the second cavity from flowing into the first cavity.

[0017] In this technical solution, the above-mentioned structural form is adopted, and the blocking member is arranged in conjunction with the one-way valve, which can open or close the pressure relief channel in the one-way valve, that is, open or close the internal circulation loop, and allow or prevent water in the second cavity from flowing into the first cavity.

[0018] Preferably, the water heater includes an internal water inlet pipe, an internal water outlet pipe and an internal circulation pump, and the internal circulation pump is arranged on the internal water inlet pipe; the first cavity includes a hot water inlet and a hot water outlet, and the second cavity includes a cold water inlet and a cold water outlet; the hot water inlet and the hot water outlet are connected to the internal water outlet pipe, the cold water inlet and the cold water outlet are connected to the internal water inlet pipe and the internal circulation pump, and the first cavity and the second cavity are connected away from the pressure relief channel through the blocking member to form an internal circulation loop; wherein, when the temperature detection device detects that the outlet water temperature is lower than the preset temperature, the control device controls the drive device to drive the blocking member to block the pressure relief channel to close the internal circulation loop; when the temperature detection device detects that the outlet water temperature is higher than the preset temperature, the control device controls the drive device to drive the blocking member away from the pressure relief channel to open the internal circulation loop.

[0019] In this technical solution, the aforementioned structure is employed, whereby the gas water heater's water inlet and outlet are connected to the cold and hot water inlets of the water tank, respectively, to divert the hot and cold water in the water tank, thereby ensuring that the incoming hot water is thoroughly mixed with the water in the first chamber. Furthermore, based on the relationship between the outlet water temperature and a preset temperature, the control device, drive device, blocking member, and one-way valve coordinate to switch between the internal and external circulation loops, thereby improving the gas water heater's resistance to water temperature fluctuations and reducing the time users have to wait for hot water.

[0020] The present invention also provides a method for controlling a constant temperature control system, using the constant temperature control system in the gas water heater described above, the method for controlling the constant temperature control system comprising the following steps:

[0021] S1. Start the gas water heater;

[0022] S2. Determine whether the user uses hot water. If yes, turn on the heating mode of the water heater and execute S3. If no, turn on the circulation mode and execute S4.

[0023] S3, determine whether the water outlet temperature is not less than the preset temperature,

[0024] If yes, execute S3.1 and output hot water stably until the user turns off the hot water;

[0025] If not, execute S3.2 and the gas water heater continues heating until the outlet water temperature is not less than the preset temperature and then returns to S3.1;

[0026] S4, determine whether the water outlet temperature is lower than the preset temperature,

[0027] If yes, execute S4.1, the gas water heater continues to operate until the return water temperature is not less than the preset temperature, and then stops the circulation;

[0028] If not, return to S3.

[0029] This technical solution utilizes a control method including a constant temperature control system. By determining whether the user is using hot water, the relationship between the outlet water temperature and a preset temperature is further determined. The method then increases or decreases the volume of the first chamber and switches between internal and external circulation loops to improve the gas water heater's ability to withstand water temperature fluctuations. This design effectively addresses the issue of slow hot water flow upon subsequent use due to accumulated water in the gas water heater tank, reducing user waiting time. Furthermore, it improves water temperature comfort without changing the hot water delivery rate.

[0030] Preferably, S3. Determine whether the outlet water temperature is not less than a preset temperature. If so, execute S3.1 including:

[0031] When the temperature detection device detects that the outlet water temperature is greater than the preset temperature, the control device controls the driving device to drive the partition assembly to move in a direction close to the second cavity and stably output hot water until the user turns off the hot water.

[0032] In the present technical solution, the above method is adopted, and when the outlet water temperature is greater than the preset temperature, the storage amount of hot water is increased by increasing the volume of the first cavity.

[0033] Preferably, in S3.1, until the user turns off the hot water, it includes S3.3: the control device controls the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop, and controls the driving device to drive the partition assembly to move in a direction away from the second cavity, and heats until the water outlet temperature is lower than the preset temperature and waits for the user to use hot water again.

[0034] In this technical solution, the above method is adopted. After the user turns off the hot water, the backflow of cold water in the first cavity is reduced by reducing the volume of the first cavity, and the internal circulation loop is opened to reduce the fluctuation of water temperature when hot water flows in next time.

[0035] Preferably, S3. Determine whether the outlet water temperature is not less than a preset temperature. If not, execute S3.2 including:

[0036] When the temperature detection device detects that the outlet water temperature is lower than the preset temperature, the control device controls the driving device to drive the partition assembly to move in a direction away from the second cavity until the outlet water temperature is no lower than the preset temperature and returns to S3.1.

[0037] In the present technical solution, the above method is adopted, and when the outlet water temperature is greater than the preset temperature, the residual cold water is reduced by reducing the volume of the first cavity.

[0038] Preferably, the circulation mode includes an energy-saving circulation mode;

[0039] S4.1 includes: when in the energy-saving circulation mode, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the inner circulation loop, open the outer circulation loop and heat the water until the temperature detection device detects that the inlet water temperature is increasing, then stops heating, and determines whether the return water temperature is less than the preset temperature after an interval;

[0040] If yes, execute S4.2, the gas water heater continues to operate until the return water temperature reaches the preset temperature and then stops circulating;

[0041] If not, execute S4.3 and stop the loop.

[0042] In the present technical solution, the above method is adopted. When the gas water heater is not in use, it is adjusted to the energy-saving circulation mode. The water heater in the powered state will determine whether to continue heating based on the outlet water temperature in the water tank at this time. Specifically, by judging whether the outlet water temperature (return water temperature) is lower than a certain preset temperature value, it is chosen whether to enter or exit the energy-saving circulation mode to maximize standby energy saving, which is beneficial to improving the service life of the gas water heater.

[0043] Preferably, S4.2 includes the control device controlling the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop, and heating until the return water temperature is equal to the preset temperature, and then stopping the circulation.

[0044] Preferably, the circulation mode also includes a conventional circulation mode;

[0045] S4.1 includes: when in the normal circulation mode, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the inner circulation loop, open the outer circulation loop and heat it until the return water temperature is greater than the preset temperature and then stops the circulation.

[0046] In the present technical solution, the above method is adopted to open the external circulation loop, that is, to heat the flowing water in the loop. On the one hand, it reduces the probability of scale deposition during heating and increases the service life of the gas water heater. On the other hand, it is conducive to mixing water after heating, which is equivalent to increasing the temperature of the water stored in the water tank, which can extend the effective use time of the water heater.

[0047] The positive and progressive effects of this invention lie in: using a partition assembly to change the volume of the first chamber at different temperatures, reducing the volume of the first chamber after a user has used the gas water heater to reduce cold water residue, while simultaneously opening the internal circulation loop to reduce water temperature fluctuations the next time hot water flows in; and increasing the volume of the first chamber the next time the user uses the gas water heater to increase the amount of hot water stored, while simultaneously opening the external circulation loop to improve the gas water heater's ability to withstand water temperature fluctuations. This design effectively solves the problem of slow hot water flow from the gas water heater tank due to accumulated water when it is used again, reducing user waiting time. It also improves water temperature comfort without changing the gas water heater's hot water flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic structural diagram of the gas water heater in Example 1 of the present invention.

[0049] Figure 2 Schematic diagram of the structure of the water tank in Example 1 of the present invention (the partition is located at the first extreme position).

[0050] Figure 3 This is a schematic diagram of the partition in the water tank located at the second extreme position in Example 1 of the present invention.

[0051] Figure 4 This is a flow chart of the constant temperature control method in Example 2 of the present invention.

[0052] Figure 5 This is a flow chart of daily hot water use in the constant temperature control method in Example 2 of the present invention.

[0053] Figure 6 This is a flow chart of the energy-saving circulation mode in the constant temperature control method in Example 2 of the present invention.

[0054] Figure 7 This is a flow chart of the energy-saving circulation mode in the constant temperature control method in Example 2 of the present invention.

[0055] Description of reference numerals:

[0056] Water tank body 100

[0057] First cavity 101

[0058] Water tank body 100

[0059] First cavity 101

[0060] Second cavity 102

[0061] Hot water inlet 11

[0062] Hot water outlet 12

[0063] Cold water inlet 13

[0064] Cold water outlet 14

[0065] Separator 15

[0066] Drive device 20

[0067] Drive motor 21

[0068] Gear 22

[0069] Drive rod 23

[0070] Pressure relief device 30

[0071] One-way valve 31

[0072] Pressure relief channel 32

[0073] Blocking member 33

[0074] Gas water heater 200

[0075] Internal water inlet pipe 41

[0076] Internal water outlet pipe 42

[0077] Internal circulation pump 43

[0078] Heat exchanger 5 DETAILED DESCRIPTION

[0079] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0080] Example 1

[0081] like Figures 1 to 2 As shown, this embodiment provides a gas water heater 200, which includes a constant temperature control system and a water tank, wherein the constant temperature control system includes:

[0082] A partition component, which divides the water tank into a first cavity 101 and a second cavity 102;

[0083] A temperature detection device is used to detect the cold water inlet temperature and the hot water outlet temperature of the water tank;

[0084] A driving device 20, the driving device 20 is used to drive the position of the partition assembly in the water tank;

[0085] Internal circulation loop, the water flow path between the gas water heater 200 and the inside of the water tank constitutes the internal circulation loop;

[0086] The external circulation loop, the water flow path between the outside of the gas water heater 200 and the water use point constitutes the external circulation loop;

[0087] The control device controls the driving device to close the inner circulation loop and open the outer circulation loop when the temperature detection device detects that the outlet water temperature is lower than the preset temperature; the control device controls the driving device to open the inner circulation loop and close the outer circulation loop when the temperature detection device detects that the outlet water temperature is higher than the preset temperature; wherein, when the inner circulation loop is closed, the driving device 20 drives the partition assembly to prevent the water in the second cavity 102 from flowing into the first cavity 101; when the inner circulation loop is opened, the driving device 20 drives the partition assembly to allow the water in the second cavity 102 to flow into the first cavity 101.

[0088] With the above-described structure, the volume of the first cavity 101 is adjusted at different temperatures through a partition assembly. After the user has finished using the gas water heater 200, the volume of the first cavity 101 is reduced to reduce cold water residue, while the internal circulation loop is opened to reduce water temperature fluctuations the next time hot water flows in. The next time the user uses the gas water heater 200, the volume of the first cavity 101 is increased to increase the amount of hot water stored, while the external circulation loop is opened to improve the gas water heater's ability to withstand water temperature fluctuations. This design effectively solves the problem of slow hot water flow from the water tank of the gas water heater 200 due to accumulated water, reducing user waiting time. It also improves water temperature comfort without changing the hot water flow rate of the gas water heater 200.

[0089] Specifically, the water tank includes a water tank body 100; a partition 15, the partition 15 divides the water tank body 100 into a first cavity 101 and a second cavity 102, and the edge of the partition 15 in contact with the inner wall of the water tank body 100 is movable relative to the inner wall of the water tank body 100; wherein, the first cavity 101 is a hot water cavity, and the hot water cavity includes a hot water inlet 11 and a hot water outlet 12; the second cavity 102 is a cold water cavity, and the cold water cavity includes a cold water inlet 13 and a cold water outlet 14.

[0090] In this embodiment, a drive device 20 is connected to the partition 15 and is used to drive the partition 15 toward the first cavity 101 or the second cavity 102. The drive device 20 is configured such that when the outlet water temperature is not less than a preset temperature, the drive device 20 drives the partition 15 toward the second cavity 102; and when the outlet water temperature is greater than the preset temperature, the drive device 20 drives the partition 15 toward the first cavity 101. The drive device 20 drives the partition 15 to change the volume of the first cavity 101 based on temperature fluctuations within the water tank, thereby facilitating the storage of hot water or the timely discharge of cold water from the second cavity 102.

[0091] Specifically, the drive device 20 includes a drive unit and a drive rod 23. In this embodiment, the water tank further includes a pressure relief device 30, wherein the pressure relief device 30 includes a one-way valve 31 and a blocking member 33. The one-way valve 31 is disposed on the partition 15, and the blocking member 33 is disposed on the end of the drive rod 23 adjacent to the one-way valve 31. The one-way valve 31 includes a pressure relief passage 32, and the blocking member 33 is used to open and close the pressure relief passage 32 to allow or prevent water in the second chamber 102 from flowing into the first chamber 101. The other end of the drive rod 23 is connected to the drive unit, which drives the drive rod 23 to move the partition 15 within the water tank body 100 and, through the blocking member 33, to allow or prevent water in the second chamber 102 from flowing into the first chamber 101. By means of the linkage of the driving part, the driving rod 23, the blocking member 33 and the one-way valve 31, the partition 15 is driven to move in the water tank body 100, thereby facilitating the improvement of the gas water heater 200's ability to resist water temperature fluctuations, and effectively solving the problem of the gas water heater 200's water tank being slow to flow out hot water when used again due to retained water, thereby improving the water temperature comfort.

[0092] In this embodiment, the drive unit includes a drive motor 21 and a gear 22. A drive rod 23 is sleeved around the center of the gear 22. A threaded surface of the drive rod 23 matches the center of the gear 22. The drive motor 21 rotates the gear 22, thereby driving the drive rod 23 toward or away from the second cavity 102. The specific structure and arrangement of the drive unit are not specifically limited herein; as long as the partition 15 can be moved within the water tank body 100, no specific limitations are imposed.

[0093] In this embodiment, the blocking member 33 is made of rubber. Since the blocking member 33 is made of rubber, a rigid collision between the blocking member 33 and the end of the one-way valve 31 and thus abrasion of the one-way valve 31 are avoided. In other alternative embodiments, the blocking member 33 may be made of an elastomeric material other than rubber, as long as a rigid collision between the blocking member 33 and the end of the one-way valve 31 is avoided.

[0094] In this embodiment, if Figure 1 As shown, the gas water heater 200 includes a heat exchanger 5, an internal water inlet pipe 41, an internal water outlet pipe 42, and an internal circulation pump 43. The heat exchanger 5 is connected between the internal water inlet pipe 41 and the internal water outlet pipe 42. The internal circulation pump 43 is provided on the internal water inlet pipe 41. The first chamber 101 includes a hot water inlet 11 and a hot water outlet 12, and the second chamber 102 includes a cold water inlet 13 and a cold water outlet 14. The hot water inlet 11 and the hot water outlet 12 are connected to the internal water outlet pipe 42, and the cold water inlet 13 and the cold water outlet 14 are connected to the internal water inlet pipe 41 and the internal circulation pump 43. The first chamber 101 and the second chamber 102 are connected away from the pressure relief channel 32 through the blocking member 33 to form an internal circulation loop.

[0095] In this embodiment, the external circulation loop is the same as that in the prior art and will not be described in detail here.

[0096] In this embodiment, the temperature detection device includes an inlet water temperature detection device and an outlet water temperature detection device (neither of which is shown in the figure). The inlet water temperature detection device is used to detect the inlet water temperature information, and the outlet water temperature detection device is used to detect the outlet water temperature information.

[0097] Among them, when the outlet water temperature detection device detects that the outlet water temperature is lower than the preset temperature, the control device controls the driving device to drive the blocking member 33 to block the pressure relief channel 32 to close the internal circulation loop; when the outlet water temperature detection device detects that the outlet water temperature is higher than the preset temperature, the control device controls the driving device to drive the blocking member 33 away from the pressure relief channel to open the internal circulation loop.

[0098] With this structure, the internal water outlet pipe 42 and the internal water inlet pipe 41 of the gas water heater 200 communicate with the cold water inlet and hot water inlet of the water tank, thereby diverting the cold and hot water in the water tank and ensuring that the incoming hot water is fully mixed with the water in the first cavity 101. Furthermore, based on the relationship between the outlet water temperature and a preset temperature, the control device, the drive device, the blocking member 33, and the one-way valve 31 cooperate to switch between the internal and external circulation loops, thereby improving the gas water heater 200's ability to withstand water temperature fluctuations and reducing the time users have to wait for hot water.

[0099] Example 2

[0100] This embodiment provides a method for controlling a constant temperature control system, using the constant temperature control system in the gas water heater as described in Example 1, combined with Figures 4 to 7 As shown, the control method of the constant temperature control system includes the following steps:

[0101] S1, start the gas water heater 200;

[0102] S2. Determine whether the user uses hot water. If yes, turn on the heating mode of the gas water heater 200 and execute S3. If no, turn on the circulation mode and execute S4.

[0103] S3, determine whether the water outlet temperature is not less than the preset temperature,

[0104] If yes, execute S3.1 and output hot water stably until the user turns off the hot water;

[0105] Specifically, when the outlet water temperature detection device detects that the outlet water temperature is greater than the preset temperature, the control device controls the driving device to drive the partition 15 to move in the direction close to the second cavity 102 and stably output hot water until the user turns off the hot water.

[0106] like Figure 2 As shown, the control device controls the driving motor 21 to drive the gear 22 to rotate, thereby driving the driving rod 23 to move toward the second cavity 102 to the first extreme position.

[0107] If not, execute S3.2 and the gas water heater 200 continues heating until the outlet water temperature is not less than the preset temperature and then return to S3.1;

[0108] Specifically, when the outlet water temperature detection device detects that the outlet water temperature is lower than the preset temperature, it is determined whether the gas water heater 200 is running at maximum power.

[0109] If yes, the control device controls the driving device to drive the partition 15 to move in the direction away from the second cavity until the outlet water temperature is not less than the preset temperature and returns to S3.1; if yes, the control device controls the driving device to drive the partition 15 to move in the direction away from the second cavity and returns to S3.1; Figure 4 As shown, the control device controls the driving motor 21 to drive the gear 22 to rotate, thereby driving the driving rod 23 to move away from the second cavity 102 to the second extreme position (as shown in FIG. Figure 3 shown).

[0110] If not, the control device controls to increase the operating power of the gas water heater 200 and returns to S3.1.

[0111] In S3.1, until the user turns off the hot water, it includes S3.3: the control device controls the driving device to drive the blocking member 33 away from the pressure relief channel to open the internal circulation loop, and controls the driving device to drive the partition 15 to move in the direction away from the second cavity 102, and heats 43 through the internal circulation pump until the water outlet temperature is lower than the preset temperature and waits for the user to use hot water again.

[0112] In this embodiment, if the user does not use hot water, the circulation mode is turned on and S4 is executed:

[0113] S4, determine whether the water outlet temperature is lower than the preset temperature,

[0114] If yes, then execute S4.1, the gas water heater 200 continues to operate until the return water temperature is not less than the preset temperature, and then stops the circulation;

[0115] If not, return to S3.

[0116] Specifically, in this embodiment, the cycle mode includes an energy-saving cycle mode, see Figure 6 ;

[0117] S4, determine whether the water outlet temperature is less than the preset temperature -5;

[0118] If yes, then execute S4.1, the gas water heater 200 continues to operate until the return water temperature is not less than the preset temperature, and then stops the circulation;

[0119] If not, return to S3.

[0120] Specifically, S4.1 includes: the control device controls the driving device to drive the blocking member 33 to block the pressure relief passage 32 to close the inner circulation loop, open the outer circulation loop, and heat the water via the external circulation pump until the inlet water temperature detection device detects that the inlet water temperature is increasing. Heating is stopped (i.e., heating is stopped when the detection time is positively correlated with the inlet water temperature. In this embodiment, the inlet water temperature detection device detects the inlet water temperature every 1 second). After the interval, it is determined whether the return water temperature is less than a preset temperature.

[0121] If yes, then S4.2 is executed and the gas water heater 200 continues to operate until the return water temperature reaches the preset temperature and stops circulating;

[0122] Specifically, the control device controls the driving device to drive the blocking member 33 away from the pressure relief channel 32 to open the internal circulation loop, and heats the return water through the internal circulation pump 43 until the return water temperature is equal to the preset temperature, and then stops the circulation.

[0123] If not, execute S4.3 and stop the loop.

[0124] Using the above method, when the gas water heater is not in use, it is adjusted to the energy-saving circulation mode. When the water heater is powered on, it will determine whether to continue heating based on the outlet water temperature in the water tank at this time. Specifically, by judging whether the outlet water temperature (return water temperature) is lower than a certain preset temperature value, it will choose whether to enter or exit the energy-saving circulation mode to maximize standby energy saving, which is beneficial to improving the service life of the gas water heater.

[0125] In this embodiment, the cycle mode also includes a conventional cycle mode, see Figure 7 ;

[0126] S4.1 includes: when in the normal circulation mode, the control device controls the driving device to drive the blocking member 33 to block the pressure relief channel 32 to close the inner circulation loop, open the outer circulation loop and heat it through the external circulation pump until the return water temperature is greater than the preset temperature and then stop the circulation.

[0127] By adopting the above method, the external circulation loop is opened, that is, the flowing water in the loop is heated. On the one hand, the probability of scale deposition during heating is reduced, and the service life of the gas water heater 200 is increased. On the other hand, it is conducive to mixing water after heating, which is equivalent to increasing the temperature of the water stored in the water tank, which can extend the effective use time of the water heater.

[0128] In summary, the constant temperature control system and control method provided in Example 1 and Example 2 respectively have the following advantages:

[0129] After the user has finished using the gas water heater 200, the volume of the first chamber 101 is reduced to minimize cold water residue, while the internal circulation loop is activated to minimize water temperature fluctuations the next time hot water is added. The next time the user uses the gas water heater, the volume of the first chamber 101 is increased to increase the amount of hot water stored, while the external circulation loop is activated to improve the gas water heater's ability to withstand water temperature fluctuations. This design effectively solves the problem of slow hot water flow due to accumulated water in the gas water heater 200's water tank, reducing user waiting time. It also improves water temperature comfort without changing the hot water delivery rate of the gas water heater.

[0130] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A gas water heater, characterized in that: The gas water heater includes a constant temperature control system and a water tank, wherein the constant temperature control system includes: a partition assembly, wherein the partition assembly divides the water tank into a first cavity and a second cavity, wherein the first cavity is a hot water cavity and the second cavity is a cold water cavity; a temperature detection device for detecting the cold water inlet temperature and the hot water outlet temperature of the water tank; a driving device, the driving device being used to drive the partition assembly to move relative to the water tank; An internal circulation loop, the water flow path between the gas water heater and the inside of the water tank constitutes the internal circulation loop; An external circulation loop, the flow path of water between the outside of the gas water heater and the water point constitutes the external circulation loop; a control device, wherein when the temperature detection device detects that the outlet water temperature is lower than a preset temperature, the control device controls the drive device to close the inner circulation loop and open the outer circulation loop; when the temperature detection device detects that the outlet water temperature is higher than a preset temperature, the control device controls the drive device to open the inner circulation loop and close the outer circulation loop; Wherein, when the internal circulation loop is closed, the driving device drives the partition assembly to prevent the water in the second cavity from flowing into the first cavity; When the internal circulation loop is opened, the driving device drives the partition assembly to allow the water in the second cavity to flow into the first cavity.

2. The gas water heater according to claim 1, wherein: The partition assembly is provided with a one-way valve and a blocking member, one end of the blocking member is connected to the driving device, and the other end is connected to the one-way valve, the one-way valve includes a pressure relief channel, and the driving device drives the blocking member to open or close the pressure relief channel to allow or prevent water in the second cavity from flowing into the first cavity.

3. The gas water heater according to claim 2, characterized in that: The water heater comprises an internal water inlet pipe, an internal water outlet pipe and a circulation pump, wherein the circulation pump is arranged on the internal water inlet pipe; The first cavity includes a hot water inlet and a hot water outlet, and the second cavity includes a cold water inlet and a cold water outlet; The hot water inlet and the hot water outlet are in communication with the internal water outlet pipe, the cold water inlet and the cold water outlet are in communication with the internal water inlet pipe and the circulation pump, and the first cavity and the second cavity are in communication away from the pressure relief channel through the blocking member to form an internal circulation loop; When the temperature detection device detects that the outlet water temperature is lower than a preset temperature, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the internal circulation loop; When the temperature detection device detects that the outlet water temperature is greater than a preset temperature, the control device controls the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop.

4. A control method for a constant temperature control system, characterized in that: Use the constant temperature control system in the gas water heater as claimed in claim 1; The control method of the constant temperature control system includes the following steps: S1. Start the gas water heater; S2. Determine whether the user uses hot water. If yes, turn on the heating mode of the gas water heater and execute S3. If no, turn on the circulation mode and execute S4. S3, determine whether the water outlet temperature is not less than the preset temperature, If yes, execute S3.1 and output hot water stably until the user turns off the hot water; If not, execute S3.2 and the gas water heater continues heating until the outlet water temperature is not less than the preset temperature and then returns to S3.1; S4, determine whether the water temperature is lower than the preset temperature, If yes, execute S4.1, the gas water heater continues to operate until the return water temperature is not less than the preset temperature, and then stops the circulation; If not, return to S3.

5. The control method of the constant temperature control system according to claim 4, characterized in that: The partition assembly is provided with a one-way valve and a blocking member, one end of the blocking member is connected to the driving device, and the other end is connected to the one-way valve, the one-way valve includes a pressure relief channel, and the driving device drives the blocking member to open or close the pressure relief channel to allow or prevent water in the second cavity from flowing into the first cavity.

6. The control method of the constant temperature control system according to claim 5, characterized in that: The water heater comprises an internal water inlet pipe, an internal water outlet pipe and a circulation pump, wherein the circulation pump is arranged on the internal water inlet pipe; The first cavity includes a hot water inlet and a hot water outlet, and the second cavity includes a cold water inlet and a cold water outlet; The hot water inlet and the hot water outlet are in communication with the internal water outlet pipe, the cold water inlet and the cold water outlet are in communication with the internal water inlet pipe and the circulation pump, and the first cavity and the second cavity are in communication away from the pressure relief channel through the blocking member to form an internal circulation loop; When the temperature detection device detects that the outlet water temperature is lower than a preset temperature, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the internal circulation loop; When the temperature detection device detects that the outlet water temperature is greater than a preset temperature, the control device controls the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop.

7. The control method of the constant temperature control system according to claim 5, characterized in that: S3. Determine whether the outlet water temperature is not less than the preset temperature. If so, execute S3.1 including: When the temperature detection device detects that the outlet water temperature is greater than the preset temperature, the control device controls the driving device to drive the partition assembly to move in a direction close to the second cavity and stably output hot water until the user turns off the hot water.

8. The control method of the constant temperature control system according to claim 7, characterized in that: In S3.1, until the user turns off the hot water, it includes S3.3: the control device controls the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop, and controls the driving device to drive the partition assembly to move in the direction away from the second cavity, and heats until the water outlet temperature is lower than the preset temperature and then waits for the user to use hot water again.

9. The control method of the constant temperature control system according to claim 4, characterized in that: S3. Determine whether the outlet water temperature is not less than the preset temperature. If not, execute S3.2 including: When the temperature detection device detects that the outlet water temperature is lower than the preset temperature, the control device controls the driving device to drive the partition assembly to move in a direction away from the second cavity until the outlet water temperature is no lower than the preset temperature and returns to S3.

1.

10. The control method of the constant temperature control system according to claim 5, characterized in that: The cycle mode includes an energy-saving cycle mode; S4.1 includes: when in the energy-saving circulation mode, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the inner circulation loop, open the outer circulation loop and heat the water until the temperature detection device detects that the inlet water temperature is increasing, then stops heating, and determines whether the return water temperature is less than the preset temperature after an interval; If yes, execute S4.2, the gas water heater continues to operate until the return water temperature reaches the preset temperature and then stops circulating; If not, execute S4.3 and stop the loop.

11. The control method of the constant temperature control system according to claim 10, wherein: S4.2 includes: the control device controlling the driving device to drive the blocking member away from the pressure relief channel to open the internal circulation loop, and heating until the return water temperature is equal to the preset temperature, and then stopping the circulation.

12. The control method of the constant temperature control system according to claim 5, characterized in that: The circulation mode also includes a conventional circulation mode; S4.1 includes: when in the normal circulation mode, the control device controls the driving device to drive the blocking member to block the pressure relief channel to close the inner circulation loop, open the outer circulation loop and heat it until the return water temperature is greater than the preset temperature and then stops the circulation.

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