Control method and device of instant water heating equipment and instant water heating equipment

Abstract

The present application relates to a kind of control method, device and instant water heating equipment of instant water heating equipment.The instant water heating equipment includes inlet water line, heat storage tank, outlet water line, instant heater and water pump, heat storage tank has stored heat storage water, flowing water from inlet water line, after heat exchange with heat storage water in heat storage tank, enter instant heater and heat, from outlet water line flow out;Method includes: obtaining the first actual temperature of first flowing water about to enter instant heater;Obtain the second actual temperature of second flowing water in outlet water line;According to first actual temperature, second actual temperature, expected temperature and water has been out time length, adjust the control voltage of water pump and the power of instant heater;Wherein, heat storage water is isolated from flowing water.The present application can meet the demand of large water flow on the basis of meeting the demand of outlet water temperature, and can be more accurate control outlet water temperature.

Description

Technical Field

[0001] This invention relates to the field of household appliances, and more particularly to a control method, apparatus, and instant hot water dispenser. Background Technology

[0002] Water heaters and water dispensers are common household appliances. Among them, instant water heaters / water dispensers can meet users' needs for hot water at any time, so their application range is very wide.

[0003] Currently, the rated operating power of household water heaters, water dispensers, and other instant hot water devices is 2200W. Under this rated power, according to the law of conservation of energy, heating water at a room temperature of 23 degrees Celsius to a high temperature of 93 degrees Celsius results in a maximum water flow rate of only 430mL / min. This relatively low flow rate means that filling a regular kettle with hot water takes a long time. Increasing the water flow rate would inevitably lower the water temperature, thus resulting in a poor user experience.

[0004] It is evident that there is currently no instant hot water supply equipment that can simultaneously take into account both water temperature and water flow rate. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a control method, device and instant hot water equipment.

[0006] In a first aspect, the present invention provides a control method for an instant hot water outlet device, the instant hot water outlet device including an inlet pipe, a heat storage tank, an outlet pipe, an instant heater and a water pump, wherein the heat storage tank stores stored hot water, flowing water enters from the inlet pipe, exchanges heat with the stored hot water in the heat storage tank, enters the instant heater for heating, and then flows out from the outlet pipe; The method includes: Obtain the first actual temperature of the first flowing water about to enter the instantaneous heater; Obtain the second actual temperature of the second flowing water in the outlet pipe; Based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output, adjust the control voltage of the water pump and the power of the instantaneous heater; The hot water storage is isolated from the flowing water, and the flow rate of the flowing water entering the water inlet pipe is adjusted by adjusting the control voltage of the water pump.

[0007] Optionally, adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the first actual temperature at the current moment is greater than or equal to the first actual temperature at the previous moment, the desired temperature is greater than the second actual temperature at the current moment, and the first difference between the desired temperature and the second actual temperature at the current moment is less than the first temperature difference, then: Reduce the power of the instant heater to a first preset power.

[0008] Optionally, if the first difference is greater than or equal to the first temperature difference, the power of the instantaneous heater is kept constant, and the control voltage of the water pump is adjusted.

[0009] Optionally, maintaining the power of the instantaneous heater constant while adjusting the control voltage of the water pump includes: The control voltage of the water pump is reduced based on the current second actual temperature, the previous second actual temperature, and the first characteristic coefficient.

[0010] Optionally, adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the first actual temperature at the current moment is less than the first actual temperature at the previous moment, the expected temperature is greater than the second actual temperature at the current moment, and the first difference between the expected temperature and the second actual temperature at the current moment is less than the first temperature difference, then: Keep the power of the instant heater constant and reduce the control voltage of the water pump.

[0011] Optionally, adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the current actual temperature is less than the previous actual temperature, the desired temperature is greater than the current actual temperature, and the first difference between the desired temperature and the current actual temperature is greater than the first temperature difference, then: Increase the power of the instantaneous heater to a second preset power; The current control voltage of the water pump is obtained based on the second preset power and the first difference.

[0012] Optionally, the current control voltage of the water pump is obtained based on the second preset power and the first difference, including: The control voltage of the water pump is reduced based on the current second actual temperature, the previous second actual temperature, and the second characteristic coefficient.

[0013] Optionally, adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the duration of water discharge exceeds the preset duration, the control voltage of the water pump will be reduced and the power of the instantaneous heater will be increased simultaneously.

[0014] Optionally, before adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output, the method further includes: Receive water discharge command; Based on the water discharge command, the initial power of the instant heater and the initial control voltage of the water pump are obtained.

[0015] Optionally, obtaining the initial power of the instantaneous heater and the initial control voltage of the water pump includes: Obtain the reference temperature of the stored hot water; The initial power of the instantaneous heater is obtained based on the reference temperature of the stored hot water; Obtain the first initial temperature of the flowing water in the water inlet pipe; Obtain the second initial temperature of the flowing water before it enters the instantaneous heater; The initial control voltage of the water pump is obtained based on the first initial temperature, the second initial temperature, and the initial power.

[0016] Optionally, obtaining the initial power of the instantaneous heater based on the reference temperature of the stored hot water includes: If the reference temperature is greater than or equal to the first threshold, then the first power is used as the initial power of the instantaneous heater; If the reference temperature is less than the first threshold, the second power is used as the initial power of the instantaneous heater. Wherein, the first power is less than the second power.

[0017] Optionally, obtaining the initial control voltage of the water pump based on the first initial temperature, the second initial temperature, and the initial power includes: The average of the first initial temperature and the second initial temperature is taken as the input temperature of the instantaneous heater; The initial control voltage of the water pump is obtained based on the input temperature, the desired temperature, and the initial power.

[0018] Optionally, the instant hot water supply device further includes a heat storage tank heater, the heat storage tank having an insulation state and an operating state. In the heat preservation state, and when the temperature of the stored hot water is less than or equal to the heating threshold, the heater of the heat storage tank heats the stored hot water in the heat storage tank to a preset temperature and then stops heating. In the operating state, the heater of the heat storage tank stops heating.

[0019] Optionally, the method further includes: If the power of the instantaneous heater is greater than or equal to a preset threshold, and the flow rate of the water in the inlet pipe is less than the minimum flow velocity, then: Increase the control voltage of the water pump to the protection voltage to increase the flow rate of the water in the inlet pipe.

[0020] Secondly, a control device for an instant hot water outlet equipment is provided, which is applied to the instant hot water outlet equipment. The instant hot water outlet equipment includes an inlet pipe, a heat storage tank, an outlet pipe, an instant heater, and a water pump. The heat storage tank stores stored hot water. Flowing water enters from the inlet pipe, exchanges heat with the stored hot water in the heat storage tank, enters the instant heater for heating, and then flows out from the outlet pipe. The device includes: A first temperature detector is used to obtain the first actual temperature of the first flowing water about to enter the instantaneous heater; The second temperature detector is used to obtain the second actual temperature of the second flowing water in the outlet pipe; The controller is used to adjust the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature and the duration of water output. The hot water storage is isolated from the flowing water, and the flow rate of the flowing water entering the water inlet pipe is adjusted by adjusting the control voltage of the water pump.

[0021] Thirdly, an instant hot water device is provided, which applies the method described above.

[0022] This invention provides a control method for an instant hot water dispenser, applied to such a device. The stored hot water has a high temperature, significantly higher than the temperature of the flowing water entering the inlet pipe 110. Therefore, the flowing water can exchange heat with the stored hot water in the storage tank 120, thereby increasing the temperature of the flowing water about to enter the instant heater 140. Even with a large flow rate, the flowing water can be heated to the desired temperature as long as the power of the instant heater 140 does not exceed its rated power. Furthermore, in this embodiment of the method, the control voltage of the water pump 150 and the power of the instant heater 140 are adjusted based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water dispensing. This comprehensively considers numerous factors, both internal and external, that affect the outlet water temperature of the instant heater 140, thus enabling relatively precise control of the outlet water temperature. Therefore, this embodiment of the method, without exceeding the rated power of the instant heater 140, can achieve both the desired outlet water temperature and a large water flow rate. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the instant hot water output device according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of the instant hot water equipment control method according to an embodiment of the present invention; Figure 3 This is a schematic flowchart of the instant hot water equipment control method according to an embodiment of the present invention; Figure 4 This is a structural block diagram of the control device for the instant hot water equipment in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Figure 1 This is an application environment diagram of the instant hot water supply equipment control method in one embodiment. (Refer to...) Figure 1 The instant hot water device includes an inlet pipe 110, a heat storage tank 120, an outlet pipe 130, an instant heater 140, and a water pump 150. The heat storage tank 120 stores hot water. Flowing water enters from the inlet pipe 110, exchanges heat with the hot water in the heat storage tank 120, enters the instant heater 140 for heating, and then flows out from the outlet pipe 130. The hot water is isolated from the flowing water. The flow rate of the flowing water entering the inlet pipe 110 is adjusted by adjusting the control voltage of the water pump 150.

[0028] The stored hot water can be daily drinking water or tap water. In the instant hot water device of this embodiment, the stored hot water is not used for drinking, but is stored in the heat storage tank 120. The heat storage tank 120 is isolated from the water path through which the instant hot water flows, that is, the stored hot water is isolated from the flowing water supplied to the user. The stored hot water can store heat and can exchange heat with the flowing water, but the stored hot water and the flowing water will not mix.

[0029] In one embodiment of the present invention, the heat storage tank 120 can be a closed tank with a heat tank outlet and a heat tank inlet, and there can be multiple water channels in the middle of the closed tank, through which flowing water can pass.

[0030] In another embodiment of the invention, the heat storage tank 120 may be a sealed tank with an external water passage.

[0031] In other embodiments of the present invention, the heat storage tank 120 and the water passage through which the flowing water passes may have other implementations, which will not be described in detail here.

[0032] In this embodiment of the invention, since the hot water stored in the heat storage tank 120 needs to be kept at a high temperature, it needs to be heated multiple times. The hot water stored in the heat storage tank 120 is isolated from the flowing water, which can prevent the "repeatedly boiled water" in the heat storage tank 120 from mixing with the flowing water and avoid adverse effects on the user's health.

[0033] like Figure 2 As shown, the present invention provides a control method for an instant hot water device, applied to the instant hot water device described above, the method comprising: Step 210: Obtain the first actual temperature of the first flowing water that is about to enter the instantaneous heater 140; Step 220: Obtain the second actual temperature of the second flowing water in the water outlet pipe 130; Step 230: Adjust the control voltage of the water pump 150 and the power of the instantaneous heater 140 according to the first actual temperature, the second actual temperature, the desired temperature and the duration of water output.

[0034] The heat storage tank 120 can exchange heat with the flowing water, meaning it can preheat the flowing water before it is heated by the instantaneous heater 140. The heat exchange time between the flowing water and the stored water in the heat storage tank 120 is very short, requiring a short period to reach the maximum temperature. Simultaneously, as heat is exchanged with the stored water, its temperature subsequently decreases, and the temperature of the flowing water heated by the stored water also decreases accordingly. Therefore, the temperature change of the flowing water heated by the heat storage tank 120 over time is as follows: initially, it is room temperature / room temperature water, then the temperature gradually rises, reaching the maximum temperature, and then the temperature of the subsequent flowing water gradually decreases.

[0035] The time it takes for the flowing water to be heated by the instant heater 140 is very short. According to the law of conservation of energy, when the desired temperature of the flowing water is high, either the flow rate of the flowing water is small or the power required by the instant heater 140 is very large.

[0036] Household power grids cannot provide sufficient power, and for safety reasons, household instant water heaters (140 models) cannot have a high rated power. Therefore, to ensure the outflowing water reaches the desired temperature, the water flow rate must be reduced. However, the outflow is insufficient to meet the user's needs.

[0037] The method of this invention is applied to an instant hot water dispenser with a heat storage tank 120. The temperature of the stored hot water in the heat storage tank 120 is high, much higher than the temperature of the flowing water entering the inlet pipe 110. Therefore, the flowing water can exchange heat with the stored hot water in the heat storage tank 120, thereby increasing the temperature of the flowing water about to enter the instant heater 140. Even if the flow rate of the flowing water is large, the flowing water can be heated to the desired temperature as long as the power of the instant heater 140 does not exceed its rated power. In the method of this invention, the control voltage of the water pump 150 and the power of the instant heater 140 are adjusted according to the first actual temperature, the second actual temperature, the desired temperature, and the duration of water dispensing. This comprehensively considers numerous factors, both internal and external, that affect the water temperature inside and outside the instant heater 140, thus enabling more precise control of the water temperature dispensed by the instant hot water dispenser. Therefore, in this invention, without exceeding the rated power of the instant heater 140, both the desired water temperature and a large water volume can be achieved.

[0038] In this embodiment of the invention, the hot water stored in the heat storage tank 120 is used to heat the flowing water and does not participate in the water output. There is no other extra empty space in the instant hot water output device for storing flowing water. Therefore, the flow rate of the flowing water is consistent throughout the entire instant hot water output device, including the flow rate of the flowing water in the inlet pipe 110 and the flow rate of the flowing water in the outlet pipe 130.

[0039] In the method of this embodiment of the invention, before adjusting the control voltage of the water pump 150 and the power of the instantaneous heater 140 based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output, the method further includes: Receive water discharge command; According to the water discharge command, the initial power of the instant heater 140 and the initial control voltage of the water pump 150 are obtained.

[0040] In this embodiment of the invention, obtaining the initial power of the instantaneous heater 140 and the initial control voltage of the water pump 150 includes: Obtain the reference temperature of the stored hot water; The initial power of the instantaneous heater 140 is obtained based on the reference temperature of the stored hot water; Obtain the first initial temperature of the flowing water in the water inlet pipe 110; Obtain the second initial temperature of the flowing water before it enters the instantaneous heater 140; The initial control voltage of the water pump 150 is obtained based on the first initial temperature, the second initial temperature, and the initial power.

[0041] In this embodiment of the invention, obtaining the initial power of the instantaneous heater 140 based on the reference temperature of the stored hot water includes: If the reference temperature is greater than or equal to the first threshold, then the first power is used as the initial power of the instantaneous heater 140; If the reference temperature is less than the first threshold, the second power is used as the initial power of the instantaneous heater 140. Wherein, the first power is less than the second power.

[0042] In this embodiment of the invention, obtaining the initial control voltage of the water pump 150 based on the first initial temperature, the second initial temperature, and the initial power includes: The average of the first initial temperature and the second initial temperature is taken as the input temperature of the instantaneous heater 140; The initial control voltage of the water pump 150 is obtained based on the input temperature, the desired temperature, and the initial power.

[0043] In this embodiment of the invention, the instant hot water device further includes a heat storage tank heater, and the heat storage tank 120 includes a heat preservation state and a working state.

[0044] In the heat preservation state, and when the temperature of the stored hot water is less than or equal to the heating threshold, the heater of the heat storage tank heats the stored hot water in the heat storage tank 120 to a preset temperature and then stops heating. In the operating state, the heater of the heat storage tank stops heating.

[0045] In this embodiment of the invention, the heat storage tank 120 includes a heat preservation state and a working state. The working state refers to the state during the time period from when the instant hot water outlet device starts discharging water to when it stops discharging water, or it can be the state during the time period from when the instant hot water outlet device receives a water discharging command to when it receives a stop command. In the working state, the heater of the heat storage tank is not working, which can reduce the overall power of the instant hot water outlet device and prevent the overall power from exceeding the rated power.

[0046] When the instant hot water supply device does not produce water, the heat storage tank 120 is in a heat preservation state. The heat storage tank heater heats the hot water stored in the heat storage tank 120 to a preset temperature and then stops heating.

[0047] The thermal storage heater does not heat in real time; it only starts heating when the temperature of the stored hot water falls below a heating threshold. Therefore, the stored hot water does not always remain at the preset temperature. Furthermore, after water is dispensed from the instantaneous heater 140, the temperature of the stored hot water decreases due to heat exchange. If water is frequently drawn, the temperature of the stored hot water may not reach the preset temperature. Therefore, when obtaining the initial power of the instantaneous heater 140 and the initial control voltage of the water pump 150, a reference temperature of the stored hot water can be obtained first.

[0048] If the reference temperature is high, it means there is more heat available for exchange, so the initial power of the heat heater 140 can be lower, for example, one-third of its maximum power. If the reference temperature is low, it means there is less heat available for exchange, so the initial power of the heat heater 140 should be slightly higher, for example, one-half of its maximum power.

[0049] After determining the initial power of the instantaneous heater 140, the flow rate of the flowing water entering the water inlet pipe 110 can be calculated based on the first initial temperature of the flowing water in the water inlet pipe 110 and the second initial temperature of the flowing water before entering the instantaneous heater 140, thereby obtaining the initial control voltage of the water pump 150.

[0050] After obtaining the initial control voltage and initial power, the hot water outlet equipment operates according to the aforementioned control voltage and initial power, and thus begins to dispense water.

[0051] In this embodiment of the invention, adjusting the control voltage of the water pump 150 and the power of the instantaneous heater 140 based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the first actual temperature at the current moment is greater than or equal to the first actual temperature at the previous moment, the desired temperature is greater than the second actual temperature at the current moment, and the first difference between the desired temperature and the second actual temperature at the current moment is less than the first temperature difference, then: Reduce the power of the instantaneous heater 140 to a first preset power.

[0052] If the first difference is greater than or equal to the first temperature difference, then keep the power of the instant heater 140 unchanged and adjust the control voltage of the water pump 150.

[0053] In this embodiment of the invention, after reducing the power of the instantaneous heater 140 to a first preset power, the method further includes: Adjust the control voltage of the water pump 150.

[0054] In this embodiment of the invention, maintaining the power of the instantaneous heater 140 constant while adjusting the control voltage of the water pump 150 includes: The control voltage of the water pump 150 is reduced based on the current second actual temperature, the previous second actual temperature, and the first characteristic coefficient.

[0055] In this embodiment of the invention, increasing or decreasing the flow rate of the flowing water requires the use of a water pump 150, which can be achieved by increasing or decreasing the control voltage of the water pump 150. pv=((last_temp-out_temp)*P+I*(set_temp-out_temp))*px (Formula 1) Where pv is the control voltage output control parameter definition of water pump 150, P is the preset proportional, I is the integral, last_temp is the second actual temperature at the previous moment, out_temp is the second actual temperature at the current moment, set_temp is the expected temperature of the outlet water, and px is the characteristic coefficient of water pump 150.

[0056] The preset ratio P can be obtained through experience or testing, and the pump characteristic coefficient px can be obtained through testing.

[0057] Formula 1 applies to all application scenarios in this invention that require adjustment of the control voltage of the water pump 150.

[0058] For applications where the temperature of the flowing water entering the instantaneous heater 140 gradually increases, the following formula 2 can also be used for calculation: pv=(i_temp-last_itemp)*x1 (Formula 2) Where i_temp is the current temperature, last_temp is the second actual temperature at the current moment, x1 is the second actual temperature at the previous moment, and x1 is the first system characteristic coefficient.

[0059] The first system characteristic coefficient x1 can be obtained through testing.

[0060] Generally speaking, the system characteristic coefficients are different for application scenarios where the temperature of the flowing water entering the instant heater 140 gradually increases and for application scenarios where the temperature of the flowing water entering the instant heater 140 gradually decreases. The gradually increasing stage is the first system characteristic coefficient, and the gradually decreasing stage is the second system characteristic coefficient.

[0061] In this embodiment of the invention, when no water is being drawn, the stored hot water has a high temperature. After water is drawn, the flowing water first exchanges heat with the stored hot water before being heated by the instantaneous heater 140 and flowing out. The heat exchange between the stored hot water and the flowing water is not immediate; it takes some time. Therefore, after the water begins to flow out and the stored hot water exchanges heat, it takes a short period of time to reach the highest temperature, approximately 15 seconds in practical applications. Then, because the heat of the stored hot water is exchanged, its temperature drops, and the temperature of the flowing water flowing out of the heat storage tank 120 also drops. That is, the temperature of the flowing water entering the instantaneous heater 140 starts from room temperature and then gradually decreases.

[0062] The first actual temperature at the current moment is greater than or equal to the first actual temperature at the previous moment, which refers to the stage in which the temperature of the flowing water about to enter the instantaneous heater 140 gradually increases.

[0063] The initial power of the instant heater 140 and the initial control voltage of the water pump 150 are calculated based on the first initial temperature of the flowing water in the water pipe and the second initial temperature of the flowing water before entering the instant heater 140. After the instant water outlet device starts to output water, the temperature of the flowing water about to enter the instant heater 140 gradually increases. That is, according to the initial power of the instant heater 140 and the initial control voltage of the water pump 150, the outlet water temperature of the instant heater 140 may be higher than the expected temperature, or even exceed 100 degrees Celsius.

[0064] Because water vaporizes at 100 degrees Celsius, and the vaporized water becomes water vapor, the volume of water vapor expands dramatically compared to liquid water. Since the interior of an instant hot water dispenser is a relatively closed environment, the expanding gas could pose a danger. Therefore, the desired temperature of the water dispensed from an instant hot water dispenser is usually below 100 degrees Celsius, and the temperature of the flowing water in the entire pipeline of the instant hot water dispenser also needs to be below 100 degrees Celsius.

[0065] Therefore, for the stage where the flowing water temperature is gradually rising as it enters the instantaneous heater 140, and although the second actual temperature is lower than the expected temperature, the difference between the two is less than the first temperature difference, the power of the instantaneous heater 140 needs to be reduced to the first preset power. If the difference between the two is greater than the first temperature difference, then the power of the instantaneous heater 140 remains unchanged.

[0066] The first preset power can be obtained based on empirical or test values, or it can simply be a power difference, such as reducing the original power from 2000W to 1900W by 100W.

[0067] The first temperature difference is relatively small, such as 3 degrees Celsius, which can be obtained based on experience or test values.

[0068] In this embodiment of the invention, the preset duration can be a relatively long period of time after water collection, which can be obtained based on experience or test values. The specific settings are described below.

[0069] In this embodiment of the invention, adjusting the control voltage of the water pump 150 and the power of the instantaneous heater 140 based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the first actual temperature at the current moment is less than the first actual temperature at the previous moment, the expected temperature is greater than the second actual temperature at the current moment, and the first difference between the expected temperature and the second actual temperature at the current moment is less than the first temperature difference, then: Keep the power of the instant heater 140 constant and reduce the control voltage of the water pump 150 to reduce the flow rate of the flowing water entering the water inlet pipe 110.

[0070] In this embodiment of the invention, adjusting the control voltage of the water pump 150 and the power of the instantaneous heater 140 based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the current actual temperature is less than the previous actual temperature, the desired temperature is greater than the current actual temperature, and the first difference between the desired temperature and the current actual temperature is greater than the first temperature difference, then: Increase the power of the instantaneous heater 140 to a second preset power; The current control voltage of the water pump 150 is obtained based on the second preset power and the first difference.

[0071] In this embodiment of the invention, obtaining the current control voltage of the water pump 150 based on the second preset power and the first difference includes: The control voltage of the water pump 150 is reduced based on the current second actual temperature, the previous second actual temperature, and the second characteristic coefficient.

[0072] pv=(i_temp-last_itemp)*x2 (Formula 3) Where i_temp is the current temperature, last_temp is the second actual temperature at the current moment, x2 is the second actual temperature at the previous moment, and x2 is the first system characteristic coefficient.

[0073] The second system characteristic coefficient x2 can be obtained through testing.

[0074] In this embodiment of the invention, adjusting the control voltage of the water pump 150 and the power of the instantaneous heater 140 based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the duration of water discharge exceeds the preset duration, the control voltage of the water pump 150 is reduced and the power of the instant heater 140 is increased simultaneously.

[0075] As described above, the temperature of the flowing water entering the instantaneous heater 140 first rises, then falls, and may even continue to fall to room temperature.

[0076] The statement that the current actual temperature is lower than the previous actual temperature refers to the stage where the temperature of the flowing water entering the instantaneous heater 140 is decreasing. During this stage, if the second actual temperature of the flowing water in the outlet pipe 130 is small compared to the desired temperature (i.e., the difference is less than the first temperature difference), the power of the instantaneous heater 140 can be kept constant, and the control voltage of the water pump 150 can be reduced to decrease the flow rate of the flowing water entering the inlet pipe 110. If the difference is greater than the first temperature difference, adjusting the flow rate alone is insufficient to raise the second actual temperature to the desired temperature; therefore, the power of the instantaneous heater 140 needs to be adjusted.

[0077] The actual temperature of the flowing water in the outlet pipe 130 is sensitive to changes in flow rate; with constant power, a decrease in flow rate leads to an increase in temperature. Similarly, changes in the power of the instantaneous heater 140 also affect the temperature of the flowing water in the outlet pipe 130; with constant flow rate, an increase in power results in a rise in temperature.

[0078] In this embodiment of the invention, the power of the instantaneous heater 140 and the flow rate of the flowing water in the inlet pipe 110 are adjusted according to the difference between the desired temperature and the second actual temperature at the current moment, so that the temperature of the flowing water in the outlet pipe 130 reaches the required level.

[0079] The second preset power is the same as or similar to the first preset power. It can be obtained based on empirical or test values, or it can be just a power difference. For example, if the original power is 2000W, it can be increased by 100W to 2100W.

[0080] When the water has been flowing for a considerable time, the temperature of the stored hot water will have dropped significantly. In this case, it is necessary to simultaneously reduce the control voltage of the water pump 150 and increase the power of the instantaneous heater 140 to ensure that the water temperature reaches the desired level. The preset duration is determined based on testing.

[0081] In this embodiment of the invention, the method further includes: If the power of the instantaneous heater 140 is greater than or equal to a preset threshold, and the flow rate of the flowing water in the water inlet pipe 110 is less than the minimum flow velocity, then: Increase the control voltage of the water pump 150 to the protection voltage to increase the flow rate of the flowing water in the water inlet pipe 110.

[0082] In this embodiment of the invention, if the power of the instant heater 140 is greater than the preset threshold, but the flow rate of the water in the pipeline is small, it means that the water is likely to be vaporized. Therefore, the control voltage of the water pump 150 will be increased to the protection voltage to increase the flow rate of the water in the water inlet pipeline 110, reduce the possibility of the water being vaporized, and improve the safety performance of the instant hot water outlet equipment.

[0083] Figure 3 The diagram shown is a flowchart of the control method for an instant hot water device according to an embodiment of the present invention. Figure 3 As shown, the method includes: Step 310: Water discharge command received.

[0084] Step 320: Water begins to flow according to the initial power of the instantaneous heater 140 and the initial control voltage of the water pump 150.

[0085] Step 330: Obtain the second actual temperature of the flowing water in the outlet pipe 130 in real time.

[0086] Step 340: Determine if the water collection time is less than one minute. If yes, proceed to step 350; otherwise, proceed to step 392.

[0087] Step 350: Determine whether the temperature of the flowing water about to enter the instant heater 140 is in the rising stage. If yes, proceed to step 360; otherwise, proceed to step 390.

[0088] Step 360: Determine whether the difference between the expected temperature and the second actual temperature is less than 3 degrees Celsius. If yes, proceed to step 370; otherwise, proceed to step 380.

[0089] Step 370: Reduce the power of the instantaneous heater 140, and proceed to step 330.

[0090] Step 380: Keep the power of the instant heater 140 unchanged, reduce the control voltage of the water pump 150, and proceed to step 330.

[0091] Step 390: Determine whether the difference between the expected temperature and the second actual temperature is less than 3 degrees Celsius. If yes, proceed to step 391; otherwise, proceed to step 392.

[0092] Step 391: Keep the power of the instant heater 140 constant and reduce the control voltage of the water pump 150.

[0093] Step 392: Increase the power of the instant heater 140 and decrease the control voltage of the water pump 150.

[0094] Figure 3 In the embodiments shown, the judgment factors such as "one minute" and "3 degrees Celsius" can be adjusted according to the actual situation. The embodiments of the present invention are only illustrative examples and do not limit the specific values.

[0095] Figure 3 In the illustrated embodiment, the two temperature difference determination factors, "3 degrees Celsius," can be used as follows: Figure 3 The settings can be the same or different.

[0096] like Figure 4 As shown, the present invention also provides a control device for an instant hot water outlet device, which is applied to the instant hot water outlet device.

[0097] The device includes: The first temperature detector 410 is used to obtain the first actual temperature of the first flowing water that is about to enter the instantaneous heater 140. The second temperature detector 420 is used to obtain the second actual temperature of the second flowing water in the water outlet pipe 130. The controller 430 is used to adjust the control voltage of the water pump 150 and the power of the instant heater 140 according to the first actual temperature, the second actual temperature, the desired temperature and the duration of water output. The hot water storage is isolated from the flowing water, and the flow rate of the flowing water entering the water inlet pipe 110 is adjusted by adjusting the control voltage of the water pump 150.

[0098] The method of this invention is applied to an instant hot water outlet device with a heat storage tank 120. The temperature of the stored hot water in the heat storage pipe is high, much higher than the temperature of the flowing water entering the inlet pipe 110. Therefore, the flowing water can exchange heat with the stored hot water in the heat storage tank 120, thereby increasing the temperature of the flowing water about to enter the instant heater 140. Even if the flow rate of the flowing water is large, the flowing water can be heated to the desired temperature as long as the power of the instant heater 140 does not exceed its rated power. In the method of this invention, the control voltage of the water pump 150 and the power of the instant heater 140 are adjusted according to the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output. This comprehensively considers numerous factors, both internal and external, that affect the water output temperature of the instant heater 140, thus enabling more precise control of the water output temperature of the instant hot water outlet device. In other words, the method of this invention, without exceeding the rated power of the instant heater 140, can achieve both the desired water temperature and a large water output.

[0099] Figures 2 to 3 This is a schematic flowchart of a control method for an instant hot water supply device in one embodiment. It should be understood that, although... Figures 2 to 3 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 2 to 3 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0100] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0101] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0102] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A control method for an instant hot water supply device, characterized in that, The instant hot water supply device includes an inlet pipe, a heat storage tank, an outlet pipe, an instant heater, and a water pump. The heat storage tank stores hot water. Flowing water enters from the inlet pipe, exchanges heat with the hot water in the heat storage tank, enters the instant heater for heating, and then flows out from the outlet pipe. The method includes: Obtain the first actual temperature of the first flowing water about to enter the instantaneous heater; Obtain the second actual temperature of the second flowing water in the outlet pipe; Based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output, adjust the control voltage of the water pump and the power of the instantaneous heater; The hot water storage is isolated from the flowing water, and the flow rate of the flowing water entering the water inlet pipe is adjusted by adjusting the control voltage of the water pump.

2. The method according to claim 1, characterized in that, The step of adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the first actual temperature at the current moment is greater than or equal to the first actual temperature at the previous moment, the desired temperature is greater than the second actual temperature at the current moment, and the first difference between the desired temperature and the second actual temperature at the current moment is less than the first temperature difference, then: Reduce the power of the instant heater to a first preset power.

3. The method according to claim 2, characterized in that, If the first difference is greater than or equal to the first temperature difference, then keep the power of the instantaneous heater constant and adjust the control voltage of the water pump.

4. The method according to claim 3, characterized in that, Maintaining the power of the instantaneous heater constant and adjusting the control voltage of the water pump includes: The control voltage of the water pump is reduced based on the current second actual temperature, the previous second actual temperature, and the first characteristic coefficient.

5. The method according to claim 1, characterized in that, The step of adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the current actual temperature is less than the previous actual temperature, the desired temperature is greater than the current actual temperature, and the first difference between the desired temperature and the current actual temperature is less than the first temperature difference, then: Keep the power of the instant heater constant and reduce the control voltage of the water pump.

6. The method according to claim 1, characterized in that, The step of adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the elapsed water time is less than or equal to a preset time, the current actual temperature is less than the previous actual temperature, the desired temperature is greater than the current actual temperature, and the first difference between the desired temperature and the current actual temperature is greater than the first temperature difference, then: Increase the power of the instantaneous heater to a second preset power; The current control voltage of the water pump is obtained based on the second preset power and the first difference.

7. The method according to claim 6, characterized in that, Based on the second preset power and the first difference, the current control voltage of the water pump is obtained, including: The control voltage of the water pump is reduced based on the current second actual temperature, the previous second actual temperature, and the second characteristic coefficient.

8. The method according to claim 1, characterized in that, The step of adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output includes: If the duration of water discharge exceeds the preset duration, the control voltage of the water pump will be reduced and the power of the instantaneous heater will be increased simultaneously.

9. The method according to claim 1, characterized in that, Before adjusting the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature, and the duration of water output, the method further includes: Receive water discharge command; Based on the water discharge command, the initial power of the instant heater and the initial control voltage of the water pump are obtained.

10. The method according to claim 9, characterized in that, The process of obtaining the initial power of the instantaneous heater and the initial control voltage of the water pump includes: Obtain the reference temperature of the stored hot water; The initial power of the instantaneous heater is obtained based on the reference temperature of the stored hot water; Obtain the first initial temperature of the flowing water in the water inlet pipe; Obtain the second initial temperature of the flowing water before it enters the instantaneous heater; The initial control voltage of the water pump is obtained based on the first initial temperature, the second initial temperature, and the initial power.

11. The method according to claim 10, characterized in that, The step of obtaining the initial power of the instantaneous heater based on the reference temperature of the stored hot water includes: If the reference temperature is greater than or equal to the first threshold, then the first power is used as the initial power of the instantaneous heater; If the reference temperature is less than the first threshold, the second power is used as the initial power of the instantaneous heater. Wherein, the first power is less than the second power.

12. The method according to claim 11, characterized in that, The step of obtaining the initial control voltage of the water pump based on the first initial temperature, the second initial temperature, and the initial power includes: The average of the first initial temperature and the second initial temperature is taken as the input temperature of the instantaneous heater; The initial control voltage of the water pump is obtained based on the input temperature, the desired temperature, and the initial power.

13. The method according to claim 1, characterized in that, The instant hot water supply equipment also includes a heat storage tank heater, which has both an insulation state and a working state. In the heat preservation state, and when the temperature of the stored hot water is less than or equal to the heating threshold, the heater of the heat storage tank heats the stored hot water in the heat storage tank to a preset temperature and then stops heating. In the operating state, the heater of the heat storage tank stops heating.

14. The method according to claim 1, characterized in that, The method further includes: If the power of the instantaneous heater is greater than or equal to a preset threshold, and the flow rate of the water in the inlet pipe is less than the minimum flow velocity, then: Increase the control voltage of the water pump to the protection voltage to increase the flow rate of the water in the inlet pipe.

15. A control device for an instant hot water supply system, characterized in that, This invention is applied to an instant hot water supply device, which includes an inlet pipe, a heat storage tank, an outlet pipe, an instant heater, and a water pump. The heat storage tank stores hot water, and flowing water enters from the inlet pipe, exchanges heat with the hot water in the heat storage tank, enters the instant heater for heating, and then flows out from the outlet pipe. The device includes: A first temperature detector is used to obtain the first actual temperature of the first flowing water about to enter the instantaneous heater; The second temperature detector is used to obtain the second actual temperature of the second flowing water in the outlet pipe; The controller is used to adjust the control voltage of the water pump and the power of the instantaneous heater based on the first actual temperature, the second actual temperature, the desired temperature and the duration of water output. The hot water storage is isolated from the flowing water, and the flow rate of the flowing water entering the water inlet pipe is adjusted by adjusting the control voltage of the water pump.

16. An instant hot water supply device, characterized in that, The method described in any one of claims 1 to 14 is applied.

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