A control method, device and system for an instant water heater

Abstract

This invention relates to the field of water dispenser technology, and provides a control method, device, and system for an instant hot water dispenser. In this invention, the start time for water replenishment is reasonably set based on the duration of sustained high flow rate Tw. Since the temperature Tbox of the insulated water tank is at its maximum when water is first dispensed, and the water volume in the insulated water tank is sufficient at this time, water is first dispensed at the maximum flow rate Fmax, and heated with a fixed heating power. Water replenishment begins only when the water dispensing time reaches the reasonably set start time, thereby extending the time of dispensing water at the maximum flow rate Fmax and reducing the waiting time for water dispensing. When water replenishment begins, water is first dispensed in power adjustment mode, that is, the water pump still dispenses water at the maximum flow rate Fmax, and the heating power P is gradually increased. This ensures that under the condition of dispensing water at the maximum flow rate Fmax, the actual water temperature can still reach the target water temperature Tob, avoiding a sudden drop in water flow rate due to a sudden drop in the temperature of the insulated water tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water dispensers, in particular to a control method, device and system of an instant water dispenser. BACKGROUND

[0002] Most of the existing instant water dispensers are composed of a heat preservation water tank, a heat preservation heating pipe and a carbon film heating pipe, and high-temperature water is pumped out of the heat preservation water tank to the carbon film heating pipe. In the case of ensuring constant target outlet water temperature, when the water temperature in the heat preservation water tank is high, the flow is large, and when the water temperature is low, the flow is small. If the heat preservation water tank is from water to no water, the water temperature in the heat preservation water tank drops sharply when water is replenished, thereby causing the flow to drop sharply and causing the water to wait for a long time.

[0003] As disclosed in the intelligent temperature control system of the instant water dispenser in patent CN103315633A, the single-chip microcomputer controls the power of the heating disc through the thyristor to keep the outlet water temperature constant at about 95℃. Thus, different inlet water temperatures can be heated to 95℃ to correspond to different flows. In winter, the outlet water decreases, and in summer, the outlet water increases. The patent provides a scheme to ensure constant target outlet water temperature, but the problem of flow drop follows. SUMMARY

[0004] The first object of the present application is to provide a control method of an instant water dispenser, which aims to solve the problem of flow drop caused by the sharp drop of the water temperature in the heat preservation water tank when water is replenished.

[0005] To achieve the above object, the present application adopts the following technical scheme:

[0006] A control method of an instant water dispenser, comprising:

[0007] calculating the minimum value Tbump of the inlet water temperature required when the maximum outlet water flow Fmax is calculated according to the target outlet water temperature Tob and the maximum outlet water flow Fmax;

[0008] solving the formula one Tw=t1+t2, formula two Tbox=((Vbox-Fmax*(t1+t2))*Tb+Fin*t2*Tin) / (Vbox-Fmax(t1+t2)+Fin*t2), and formula three (Vbox-Fin*t2)*(Tb-Tbump)=Fin*t2*(Tbump-Tin) to obtain Tw, wherein Tw is the time of continuously discharging water at the maximum outlet water flow Fmax, t1 is the water discharge time without water replenishment, t2 is the water discharge time with water replenishment, Tbox is the temperature of the heat preservation water tank, Vbox is the capacity of the heat preservation water tank, Fmax is the maximum outlet water flow, Fin is the inlet water flow, Tin is the inlet water temperature, and Tb is the preset temperature of the heat preservation water tank;

[0009] A start water supplement time is set, and the start water supplement time is in the interval of Tw / 2.5-Tw / 1.5.

[0010] Further, the method comprises the following steps:

[0011] It is judged whether the water supply time is less than the start water supplement time. If yes, the water pump is controlled to supply water at the maximum water supply flow Fmax and heating is performed at the fixed heating power P. If no, a power adjustment mode is entered.

[0012] The power adjustment mode: the water pump is controlled to supply water at the maximum water supply flow Fmax, the heating power P is gently increased, and it is judged whether the heating power P reaches the maximum heating power Pmax. If yes, a flow adjustment mode is entered. If no, the increasing continues.

[0013] The flow adjustment mode: the maximum heating power Pmax is kept, and the water supply flow Fb is gently reduced from the maximum water supply flow Fmax.

[0014] Further, the minimum value Tbump of the required water inlet temperature when the maximum water supply flow Fmax is calculated based on the formula Fmax=Pt / ((Tob-Tbump)*C), P is the fixed heating power, and t is the heating time.

[0015] Further, the heating power P is calibrated based on the formula P=C*ΔT*Fb / t, wherein ΔT is the difference between the water inlet temperature and the water outlet temperature of the heating pipe.

[0016] Further, the heating power P is calibrated according to the related values obtained after the water pump supplies water for 15 seconds.

[0017] Further, the start water supplement time is preferably Tw / 2.

[0018] The second object of the present application is to provide a control device of an instant water heater, which aims to solve the problem of flow reduction caused by the sudden drop of the water temperature in the heat preservation tank during water supplement.

[0019] A control device of an instant water heater, the control device comprising a silicon controlled rectifier controller, which is used to execute the control method of the instant water heater as described above.

[0020] The third object of the present application is to provide a control system of an instant water heater, which aims to solve the problem of flow reduction caused by the sudden drop of the water temperature in the heat preservation tank during water supplement.

[0021] A control system of an instant water heater, the control system comprising a water pump, a heat preservation tank, a plurality of flow meters, a plurality of heating pipes and a plurality of temperature sensors, which are used to execute the control method of the instant water heater as described above.

[0022] Compared with the background art, the present application has the following advantages:

[0023] 1. In the present application, the water replenishment time is set according to the time Tw of sustainable high flow rate. Since the temperature Tbox of the heat preservation tank is the highest at the beginning of water taking, the water in the heat preservation tank is sufficient at this time, so the water is taken at the maximum flow rate Fmax first, and heated at a fixed heating power. When the water taking time reaches the set water replenishment time, the water replenishment is started, so as to prolong the time of water taking at the maximum flow rate Fmax and reduce the waiting time of water taking.

[0024] 2. When the water replenishment is started, the water is taken at the power adjustment mode, i.e. the water pump still takes water at the maximum flow rate Fmax, and the heating power P is increased gently, so as to ensure that the actual water taking temperature can reach the target water taking temperature Tob under the condition of water taking at the maximum flow rate Fmax, i.e. to ensure that the water taking amount is sufficient and the water taking temperature can be kept constant at the target water taking temperature Tob by adjusting the heating power.

[0025] 3. When the heating power reaches the maximum heating power Pmax during the water replenishment, the flow rate Fb is decreased gently, so as to avoid the situation that the flow rate Fb is suddenly decreased due to the sudden temperature drop of the heat preservation tank, and the user is scalded by the gasification of the heating pipe. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A flow chart for determining the water replenishment time in the control method of the instant water dispenser according to the present application;

[0027] Figure 2 A flow chart of the control method of the instant water dispenser according to the present application;

[0028] Figure 3 A structure diagram of the control system of the instant water dispenser according to the present application.

[0029] REFERENCE SIGNS:

[0030] 1. water pump; 2. heat preservation tank; 3. first heating pipe; 4. second heating pipe; 5. first temperature sensor; 6. second temperature sensor; 7. third temperature sensor; 8. fourth temperature sensor; 9. flow meter A; 10. flow meter B. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0032] In addition, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientation or positional relationship shown in the drawings and are merely used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements of the present application must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] When an element is referred to as being "fixed to" or "set to" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances.

[0035] Embodiment one

[0036] Please refer to Figure 1 and Figure 3 The present embodiment provides a control method of an instant water heater, comprising:

[0037] A control method of an instant water heater, comprising:

[0038] According to the target water outlet temperature Tob and the maximum water outlet flow Fmax, the minimum value Tbump of the water inlet temperature required when the maximum water outlet flow Fmax is calculated;

[0039] The simultaneous equations Formula One Tw=t1+t2, Formula Two Tbox=((Vbox-Fmax*(t1+t2))*Tb+Fin*t2*Tin) / (Vbox-Fmax(t1+t2)+Fin*t2), and Formula Three (Vbox-Fin*t2)*(Tb-Tbump)=Fin*t2*(Tbump-Tin) are used to calculate Tw, wherein Tw is the time that water can be continuously discharged at the maximum water outlet flow Fmax, t1 is the water discharge time without water supplement, t2 is the water discharge time with water supplement, Tbox is the temperature of the heat preservation water tank 2, Vbox is the capacity of the heat preservation water tank 2, Fmax is the maximum water outlet flow, Fin is the water inlet flow, Tin is the water inlet temperature, and Tb is the preset temperature of the heat preservation water tank 2;

[0040] Set the start time for water replenishment, with the start time value ranging from Tw / 2.5 to Tw / 1.5.

[0041] Specifically, the insulation temperature of the insulated water tank 2 is preset to Tb. When water is not drawn and heated, the second heating tube 4 in the insulated water tank 2 works to heat the water temperature of the insulated water tank 2 to the preset value Tb. At this time, the temperature Tbox of the insulated water tank 2 is equal to the insulation temperature Tb of the insulated water tank 2. If water is drawn, in order to ensure that the water supply in the insulated water tank 2 is sufficient, water needs to be added. Once water is added, the temperature Tbox of the insulated water tank 2 will drop, which will cause the actual water temperature to drop. In order to ensure that the actual water temperature is constant at the target water temperature Tob, the water flow rate must be adjusted and reduced. Therefore, in this invention, the minimum inlet water temperature Tbump required when the maximum water flow rate Fmax is calculated first, that is, the minimum temperature Tbox of the insulated water tank 2 when the maximum water flow rate Fmax is satisfied. The maximum water flow rate Fmax is a fixed preset value. Then, the time Tw for the continuous high flow rate is calculated. The water replenishment time is adjusted according to the continuous high flow rate time Tw, so as to extend the time for water to be discharged at the maximum water flow rate Fmax.

[0042] First, calculate the time t2 for simultaneous water replenishment and discharge according to Formula 3: (Vbox-Fin*t2)*(Tb-Tbump)=Fin*t2*(Tbump-Tin). Please refer to [the relevant formula]. Figure 3 As shown, the inlet flow rate Fin is measured by flow meter A9, and the inlet temperature Tin is measured by the third temperature sensor 7. Then, the no-replenishment water discharge time t1 is calculated according to formula two: Tbox=((Vbox-Fmax*(t1+t2))*Tb+Fin*t2*Tin) / (Vbox-Fmax(t1+t2)+Fin*t2). Please refer to... Figure 3 As shown, the temperature Tbox of the insulated water tank is measured by the fourth temperature sensor 8. In summary, the time Tw for continuous water discharge at the maximum water flow rate Fmax can be obtained according to formula Tw=t1+t2.

[0043] Furthermore, it should be noted that, in order to ensure safety during use, the first heating tube 3 and the second heating tube 4 do not work simultaneously. During the water extraction process, the second heating tube 4 in the insulated water tank 2 stops working, and the first heating tube 3 in the control system starts working. Therefore, the adjustment of heating power mentioned in this invention only involves the first heating tube 3.

[0044] like Figure 2 and Figure 3 As shown, the control method includes the following steps:

[0045] Determine if the water output time is less than the start water replenishment time. If so, control water pump 1 to output water at the maximum flow rate Fmax and heat it with a fixed heating power P. If not, enter the power adjustment mode.

[0046] Power adjustment mode: Control water pump 1 to output water at the maximum water flow rate Fmax, and gradually increase the heating power P. Determine whether the heating power P has reached the maximum heating power Pmax. If yes, enter the flow adjustment mode; if not, continue to increase.

[0047] Flow regulation mode: Maintain maximum heating power Pmax while controlling the outlet water flow rate Fb to gradually decrease from the maximum outlet water flow rate Fmax.

[0048] Specifically, based on the duration of sustained high flow rate Tw, the water replenishment start time is reasonably set. Since the temperature Tbox of the insulated water tank 2 is at its maximum when water is first drawn, and the water volume in the insulated water tank 2 is sufficient at this time, water is first drawn out at the preset maximum water flow rate Fmax and heated with a fixed heating power P. Water replenishment is then started when the water drawing time reaches the reasonably set water replenishment start time, thereby extending the time of water drawing out at the maximum water flow rate Fmax and reducing the water drawing waiting time.

[0049] Meanwhile, when water replenishment begins, water is first discharged in power regulation mode, that is, water pump 1 still discharges water at the maximum water flow rate Fmax, and the heating power P is slowly increased. This ensures that under the condition of discharging water at the maximum water flow rate Fmax, the actual water temperature can still reach the target water temperature Tob, thus ensuring sufficient water output and that the water temperature can be kept constant at the target water temperature Tob by adjusting the heating power.

[0050] In addition, during the water replenishment process, when the heating power has reached the maximum heating power Pmax, the water flow rate Fb is slowly reduced to avoid the situation where the water flow rate Fb drops suddenly due to the sudden cooling of the insulated water tank 2, which could cause the first heating tube 3 to vaporize and scald the user.

[0051] Furthermore, based on the formula Fmax=Pt / ((Tob-Tbump)*C), the minimum inlet water temperature Tbump required to calculate the maximum outflow rate Fmax is calculated, where P is the fixed heating power and t is the heating time. In this embodiment, the heating time t is 60s, which corresponds to the flow rate calculation time.

[0052] Specifically, when water replenishment has not started, the temperature Tbox of the insulated water tank 2 remains unchanged. At this time, the minimum inlet water temperature Tbump required for the calculated maximum outflow rate Fmax is equal to the temperature Tbox of the insulated water tank 2. When water replenishment begins, the temperature Tbox of the insulated water tank 2 decreases.

[0053] Furthermore, the heating power P is calibrated based on the formula P = C * ΔT * Fb / t, where ΔT is the difference between the inlet and outlet water temperatures of the first heating element 3. For details, please refer to... Figure 3 As shown, the inlet water temperature is measured by the first temperature sensor 5, the outlet water temperature is measured by the second temperature sensor 6, and Fb is measured by the flow meter B10.

[0054] The heating power P is calibrated based on the relevant values ​​obtained after the water pump 1 dispenses water for 15 seconds. The performance of the first heating tube 3 may change over time, causing the fixed heating power to change. Therefore, the heating power P of the first heating tube 3 is calibrated based on the difference between the inlet water temperature and the outlet water temperature when the water is dispensed, so as to ensure that the outlet water temperature is the target outlet water temperature and is relatively constant.

[0055] Furthermore, the preferred time to start water replenishment is Tw / 2. Starting water replenishment at this time ensures that the temperature of the insulated water tank 2 does not drop rapidly after subsequent water replenishment, effectively extending the time for water to be discharged at the maximum water flow rate Fmax, and also ensures that the water volume in the insulated water tank 2 is sufficient.

[0056] Specifically, in this invention, such as Figure 2 As shown, when water is discharged, the water pump 1 discharges water at the pre-set maximum water flow rate Fmax. The heating power P is quickly calibrated based on the difference between the inlet and outlet water temperatures of the first heating tube 3. When the water discharge time reaches the start water replenishment time, the maximum water flow rate Fmax is kept unchanged, and the heating power P is gradually increased until the heating power P reaches the maximum heating power Pmax. Then, the water flow rate Fb is controlled to gradually decrease from the maximum water flow rate Fmax.

[0057] Example 2

[0058] This embodiment provides a control device for an instant hot water dispenser. The control device includes a silicon controlled rectifier (SCR) controller for executing the instant hot water dispenser control method as described in Embodiment 1.

[0059] For the apparatus embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this disclosure according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0060] Example 3

[0061] likeFigure 3 As shown, this embodiment provides an instant hot water dispenser control system. The control system includes a water pump 1, an insulated water tank 2, several flow meters, several heating tubes, and several temperature sensors, and is used to execute the instant hot water dispenser control method as described in Embodiment 1.

[0062] Specifically, in this embodiment, the flow meters include flow meter A9 and flow meter B10, the heating tubes include first heating tube 3 and second heating tube 4, and the temperature sensors include first temperature sensor 5, second temperature sensor 6, third temperature sensor 7 and fourth temperature sensor 8.

[0063] Meanwhile, water pump 1 uses PWM regulation technology to control and regulate the water flow rate Fb.

[0064] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method for an instant hot water dispenser, characterized in that, include: Calculate the minimum value Tbump of the insulated water tank temperature Tbox when the maximum outlet flow rate Fmax is met, based on the target outlet water temperature Tob and the maximum outlet flow rate Fmax. We can calculate Tw by combining the following formulas: Formula 1: Tw = t1 + t2; Formula 2: Tbox = ((Vbox - Fmax * (t1 + t2)) * Tb + Fin * t2 * Tin) / (Vbox - Fmax (t1 + t2) + Fin * t2); Formula 3: (Vbox - Fin * t2) * (Tb - Tbump) = Fin * t2 * (Tbump - Tin). Where Tw is the time during which water can be discharged continuously at the maximum outflow rate Fmax, t1 is the time during which water is discharged without replenishment, t2 is the time during which water is discharged while replenishment is in progress, Tbox is the temperature of the insulated water tank, Vbox is the capacity of the insulated water tank, Fmax is the maximum outflow rate, Fin is the inflow rate, Tin is the inflow temperature, and Tb is the preset temperature of the insulated water tank. Set the start time for water replenishment, where the start time is in the range of Tw / 2.5-Tw / 1.5; When drawing water, water is first drawn out at the maximum flow rate Fmax and heated with a fixed heating power. Water is then replenished when the water drawing time reaches the set start time for water replenishment.

2. The instant hot water dispenser control method according to claim 1, characterized in that, Includes the following steps: Determine if the water output time is less than the water replenishment start time. If so, control the water pump to output water at the maximum water flow rate Fmax and heat it with a fixed heating power P. If not, enter the power adjustment mode. Power adjustment mode: Control the water pump to output water at the maximum water flow rate Fmax, and gradually increase the heating power P. Determine whether the heating power P has reached the maximum heating power Pmax. If yes, enter the flow adjustment mode; if no, continue to increase. Flow regulation mode: Maintain the maximum heating power Pmax while controlling the outlet water flow rate Fb to decrease gradually from the maximum outlet water flow rate Fmax.

3. The instant hot water dispenser control method according to claim 2, characterized in that: The minimum value of the insulated water tank temperature Tbump is calculated based on the formula Fmax=Pt / ((Tob-Tbump)*C) to satisfy the maximum outflow rate Fmax, where P is the fixed heating power and t is the heating time.

4. The instant hot water dispenser control method according to claim 3, characterized in that, The heating power P is calibrated based on the formula P=C*ΔT*Fb / t, where ΔT is the difference between the inlet and outlet water temperatures of the heating element.

5. The instant hot water dispenser control method according to claim 4, characterized in that, The heating power P is calibrated based on the relevant value obtained after the water pump dispenses water for 15 seconds.

6. The instant hot water dispenser control method according to claim 1, characterized in that, The start time for water replenishment is Tw / 2.

7. A control device for an instant hot water dispenser, characterized in that, The control device includes a silicon controlled rectifier (SCR) controller for executing the instant hot water dispenser control method as described in any one of claims 1-6.

8. A control system for an instant hot water dispenser, characterized in that, The control system includes a water pump, an insulated water tank, several flow meters, several heating tubes, and several temperature sensors, and is used to execute the instant hot water dispenser control method as described in any one of claims 1-6.

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