Water heater and thermal pool equipment thereof, and water outlet control method

Abstract

The present invention discloses a water heater and its thermal pool equipment, and a water outlet control method. A thermal pool component with dual channels is integrated in the water heater. During the first heating, the pipes in the thermal pool are switched by controlling the water flow to pass through a first heating channel to achieve the purpose of rapidly increasing the water temperature. After the water is stopped, the water temperature in the thermal pool is increased through internal circulation, so that the temperature of the cold water section is increased when the water is turned on again. The switching of the first heating channel and the second heating channel is controlled by the water outlet control method, so that the outlet water temperature of the water outlet end is maintained within a preset range, ensuring that the water is discharged within a constant temperature range, thereby improving the user experience, and having the advantages of simple structure, low cost, and strong practicality.

Description

Technical Field

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

[0002] The main selling water heaters on the market currently cannot solve the problem of sudden drop in water temperature when the water is turned off and then turned on again. Even the zero cold water models can only ensure that the water temperature does not drop by starting the circulation function after turning off the water. In most cases, the temperature drop problem cannot be solved. The mainstream solution to this problem is to use zero cold water or thermal pool devices to solve this problem. On the one hand, it cannot be solved completely, and on the other hand, the cost is high. At the same time, the existing solutions may also bring other problems, such as energy consumption problems, slow initial heating problems, etc. The solution to this problem through ordinary thermal pools has the problem of slow initial heating, which affects the user experience. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the problems of slow initial heating of the existing thermal pool in the prior art, inability to effectively solve the problem of constant temperature water output, resulting in poor user experience, and the like. A dual-channel thermal pool component is provided. During the first heating, by optimizing the hardware structure of the thermal pool component and the corresponding control method, the water flows through a single channel to achieve the purpose of quickly increasing the water temperature. After the water is cut off, the water temperature in the water storage tank is increased through internal circulation, and the temperature of the cold water section is increased when the water is turned on again, so that the effect of constant temperature water output can be ensured when the water is turned off and then on, thereby improving the user experience.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a thermal pool device, characterized in that the thermal pool device is integrated in a water heater, and the thermal pool device comprises a shell structure, a channel structure penetrating the shell structure, and a driving mechanism;

[0006] The channel structure includes a first pipeline and a second pipeline sharing the same water inlet, and a third pipeline and a fourth pipeline connected to the second pipeline;

[0007] The water inlet is connected to the water outlet of the heat exchanger in the water heater, the water outlet of the first pipeline is connected to the water outlet of the water heater, and the first pipeline is provided with a water inlet unit;

[0008] The water outlet end of the third pipeline is communicated with the internal circulation pipeline in the water heater, and the water outlet end of the fourth pipeline is located inside the shell structure;

[0009] Wherein, the driving mechanism is used to drive the first pipeline to open when the water is turned on, and at the same time the second pipeline, the third pipeline, and the fourth pipeline are closed, so as to heat and discharge water based on the first pipeline;

[0010] The driving mechanism is also used to drive the first pipeline to close within a set time after the water is turned off, and at the same time the second pipeline, the third pipeline, and the fourth pipeline are opened, so as to inject warm water generated by the internal circulation into the shell structure, and inject it into the first pipeline based on the water inlet unit, so as to output constant temperature water from the first pipeline when the water is turned on again.

[0011] Preferably, the third pipeline and the fourth pipeline connected to the second pipeline include:

[0012] The first heating channel formed by the first pipeline corresponds to a rapid heating mode;

[0013] The second heating channel formed by the second pipeline, the third pipeline and the fourth pipeline corresponds to the internal circulation heating mode.

[0014] Preferably, the water inlet unit further comprises a plurality of hole structures axially arranged on the first pipeline and a floating plate structure matched with the plurality of hole structures, and the floating plate structure is fixedly arranged on the outer sides of the plurality of hole structures;

[0015] Preferably, the floating plate structure further comprises a baffle, a floating plate and a spring connected in sequence, and the spring is fixed on the side wall of the first pipeline;

[0016] When the water level of the thermal pool does not reach the position of the floating plate, the baffle is used to block the plurality of hole structures on the first pipeline;

[0017] When the water level of the thermal pool reaches the position of the floating plate, the floating plate is pushed upward by the spring to expose the hole structure so as to inject water in the thermal pool into the hole structure.

[0018] Preferably, the driving mechanism comprises:

[0019] The driving mechanism includes an electric valve disposed at the intersection of the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline, and a driving motor fixedly disposed at a set position of the housing structure and electrically connected to the electric valve;

[0020] The drive motor drives the working state of the corresponding electric valve based on the received different control instructions.

[0021] Preferably, the third pipeline and the fourth pipeline are arranged in sequence along a direction away from the water inlet.

[0022] The present invention also provides a water heater, which comprises the thermal pool device described in any one of the above.

[0023] Preferably, the water heater further comprises a water inlet, a water outlet, a water pump assembly, a one-way valve, a fan assembly and a heat exchanger.

[0024] The present invention also provides a water outlet control method for a water heater, the water outlet control method is implemented by the above-mentioned water heater, when the water inlet temperature of the water heater is less than a preset threshold, the water outlet control method comprises:

[0025] Based on the interval between the water-off operation and the water-on operation that are executed successively, a corresponding channel switching strategy is preset;

[0026] When the water is turned on again, the actual interval duration is obtained and the corresponding target channel switching strategy is matched;

[0027] Based on the target channel connection strategy, control the channel in the thermal pool device to switch to the target heating channel for heating so as to achieve a water outlet temperature of the water heater within a preset range;

[0028] Wherein, the target heating channel includes a first heating channel corresponding to a rapid heating mode, or a second heating channel corresponding to an internal circulation heating mode.

[0029] Preferably, the preset corresponding channel connection strategy based on the interval between the water-off operation and the water-on operation performed successively in sequence includes:

[0030] After the water is turned on and then off, the channel in the thermal pool is controlled to switch to the first heating channel;

[0031] If the actual interval duration is greater than or equal to the preset duration when the water is turned on again, the channel in the thermal pool is controlled to switch to the second heating channel, and the first heating channel is controlled to be closed.

[0032] Preferably, after the water is turned on and then turned off, the step of controlling the channel in the thermal pool to switch to the first heating channel includes:

[0033] When the water is boiling, the first pipeline is driven to open, and the second pipeline, the third pipeline, and the fourth pipeline are closed at the same time, so as to heat and discharge water based on the first pipeline;

[0034] If the water is turned on again, the actual interval duration is greater than or equal to the preset duration, and the step of controlling the channel in the thermal pool to switch to the second heating channel comprises:

[0035] Within a set time after the water is turned off, the first pipeline is driven to close, and at the same time the second pipeline, the third pipeline, and the fourth pipeline are opened to inject warm water generated by the internal circulation into the shell structure, and inject it into the first pipeline based on the water inlet unit, so that constant temperature water can be output from the first pipeline when the water is turned on again.

[0036] The positive and progressive effects of the present invention are:

[0037] In the present invention, a thermal pool component with dual channels is used. During the first heating, the water flow is made to pass through the first heating channel through a program to achieve the purpose of rapidly increasing the water temperature. After the water is stopped, the water temperature in the thermal pool is increased through internal circulation, so that the temperature of the cold water section is increased when the water is turned on again. The switching of the first heating channel and the second heating channel is controlled by a program, so that the outlet water temperature at the water outlet is maintained within a preset range, ensuring that the water is discharged within a constant temperature range, improving the user experience, and having the advantages of simple structure, low cost, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of the thermal pool equipment of Example 1 of the present invention.

[0039] Figure 2 This is a schematic diagram of the structure of the water heater according to Embodiment 2 of the present invention.

[0040] Figure 3 It is a flow chart of the water outlet control method of the water heater according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0042] Example 1

[0043] like Figure 1 As shown, the thermal pool device of this embodiment is integrated in the water heater, and the thermal pool device includes a shell structure, a channel structure penetrating the shell structure, and a driving mechanism 5;

[0044] The channel structure includes a first pipeline 1 and a second pipeline 2 that share a common water inlet, and a third pipeline 3 and a fourth pipeline 4 that are connected and arranged on the second pipeline 2;

[0045] The water inlet end of the first pipeline 1 is connected to the water outlet end of the heat exchanger of the water heater, and the water inlet end of the second pipeline 2 is arranged on the side wall of the first pipeline, which is equivalent to sharing the same water inlet with the first pipeline.

[0046] The water inlet of the thermal pool is connected to the water outlet of the heat exchanger in the water heater, the water outlet of the first pipeline is connected to the water outlet of the water heater, and a water inlet unit is provided on the first pipeline.

[0047] The water outlet end of the third pipeline 3 is connected to the internal circulation pipeline in the water heater. The internal circulation pipeline passes through a one-way valve and a heat exchanger of the water heater to form a circulation pipeline with the first pipeline. The water outlet end of the fourth pipeline 4 is located inside the shell structure, and the heated water in the circulation pipeline can be injected into the thermal pool.

[0048] Among them, the driving mechanism 5 is used to drive the first pipeline to open when the water is turned on, and at the same time the second pipeline 2, the third pipeline 3, and the fourth pipeline 4 are closed, so as to heat the water based on the first pipeline. At this time, the water in the water heater that passes through the heat exchanger directly flows to the water outlet of the water heater through the first pipeline. The pipeline route is the shortest, which can ensure that the water outlet of the water heater flushes out hot water at the fastest speed when the water is turned on for the first time.

[0049] The driving mechanism 5 is also used for a set time after turning off the water. For example, in daily life, after turning off the water, the user will perform actions such as scrubbing the body and applying shower gel. After turning off the water, the driving mechanism 5 will drive the first pipeline 1 to close, and at the same time the second pipeline 2, the third pipeline 3, and the fourth pipeline 4 are opened. At this time, the internal circulation heating is turned on, and the water heater will ensure that the water in the circulation pipeline is warm water and inject the warm water generated by the internal circulation into the shell structure through the fourth pipeline 4, and inject it into the first pipeline 1 based on the water inlet unit, so that after the water is turned off for more than the set time, the water level in the water tank rises, and when the water is turned on again, the water in the thermal pool will output constant temperature water from the first pipeline 1.

[0050] Specifically, the third pipeline 3 and the fourth pipeline 4 connected to the second pipeline 2 include:

[0051] The first heating channel formed by the first pipeline 1 corresponds to the rapid heating mode. The first heating channel formed in this case is the shortest, which can ensure that the hot water of the water heater can be quickly discharged and realize rapid heating when the water is boiled for the first time.

[0052] The second heating channel formed by the second pipeline 2, the third pipeline 3 and the fourth pipeline 4 corresponds to the internal circulation heating mode.

[0053] Specifically, the water inlet unit also includes a plurality of hole structures axially arranged on the first pipeline and a floating plate structure cooperating with the plurality of hole structures. The floating plate structure is fixedly arranged on the outside of the plurality of hole structures. A plurality of hole structures are arranged at the upper position of the first pipeline 1, and a floating plate structure is arranged on the outside of the hole structure.

[0054] Specifically, the floating plate structure also includes a baffle 6, a floating plate 7 and a spring 8 connected in sequence. When the water level in the thermal pool does not reach the position of the floating plate 7, the baffle 6 is used to block the several hole structures on the first pipeline. In this embodiment, the program sets the water shut-off time node to three minutes. Within three minutes after the water is shut off, the water level reached by the water injected into the thermal pool through the fourth pipe 4 is not enough to reach the height of the floating plate 7. After the water is shut off for more than three minutes, the internal circulation heating mode stops, and the water level reached by the water injected into the thermal pool through the fourth pipe 4 will reach the position of the floating plate. At this time, the floating plate 7 will be pushed to move up through the spring 8 to expose the hole structure on the first pipe 1 so as to inject the water in the thermal pool into the hole structure and connect it to the water outlet through the first pipe 1 to flow out. In this embodiment, the water temperature at the water outlet within three minutes can be guaranteed by circulating heating, and the temperature drop can be alleviated by the water temperature buffer in the thermal pool beyond three minutes.

[0055] Specifically, the driving mechanism comprises:

[0056] The driving mechanism includes an electric valve provided at the intersection of the first pipeline 1, the second pipeline 2, the third pipeline 3, and the fourth pipeline 4, and a driving motor fixedly arranged at a set position of the housing structure and electrically connected to the electric valve;

[0057] The drive motor drives the working state of the corresponding electric valve based on the different control instructions received, and the drive motor drives the opening and closing of the electric valve to achieve the connection of different pipelines.

[0058] Specifically, the third pipeline and the fourth pipeline are arranged in sequence along a direction away from the water inlet.

[0059] In this embodiment, the thermal pool is equivalent to a water storage tank or an expansion tank, but its functions are not limited to these two. It has two main functions in this embodiment. First, it serves as a buffer space for high-temperature water when the water is cut off and then turned on. High-temperature water and low-temperature water can be fully mixed in this tank, and the temperature of the low-temperature water will rise faster, and the effect will be very good. At the same time, it can be used as a buffer space for high-temperature water when the water is cut off and then turned on. The temperature fluctuation can be reduced by premixing.

[0060] This embodiment reasonably controls the conduction of the internal pipes of the thermal pool through program control, so as to achieve a short first heating time, a fast heating speed, and less temperature drop after turning off the water and then turning it on again, so as to achieve the same effect with low energy consumption. Specifically, if the water heater does not work for a period of time, the first pipe 1 and the second pipe 2 inside the thermal pool are connected for the first heating, which saves the channel length and has a fast heating speed. After the water is turned off for the first heating, the first pipe 1 and the third pipe 3 are quickly connected, the internal circulation function is started, the cold water in the heat exchange tube is heated, and it is injected into the thermal pool through the fourth pipe 4. When the water is turned on again three minutes later, the warm water level in the thermal pool reaches the upper position of the floating plate structure of the first pipe, and the warm water in the thermal pool is poured back into the first pipe 1 through the hole structure, so that the water temperature will not drop when the water is turned on again. The cold end of the water stop and then the water is turned on again has been heated, and the water inside the thermal pool has also been heated to buffer the cold water flowing over. After the two are neutralized, the water temperature will not drop when the water is turned on again, which improves the user experience.

[0061] Example 2

[0062] This embodiment provides a water heater, which includes the thermal pool device described in Embodiment 1.

[0063] Specifically, the water heater is composed of: Figure 2 As shown, it includes a water inlet 21, a water outlet 22, a water pump assembly 23, a one-way valve 24 and a fan assembly 25, a heat exchanger 26 and the above-mentioned thermal pool equipment 27.

[0064] Among them, water heaters include but are not limited to gas water heaters.

[0065] The water heater of this embodiment is provided with the above-mentioned components and controls the channel switching inside the thermal pool component to ensure that the first heating time is short and the heating speed is fast. At the same time, the water inside the thermal pool and the water in the heat exchange pipe are heated after the water is turned off for the first heating to ensure that there is no cold water section when the water is turned on again. The water temperature within three minutes can be guaranteed by circulating heating, and the temperature drop problem can be alleviated by the water temperature buffer in the thermal pool after three minutes. In general, it can maximize the user experience while reducing the number of heating times as much as possible to reduce energy consumption. The structure is simple and practical.

[0066] Example 3

[0067] This embodiment provides a water output control method for a water heater, and the specific steps are as follows: Figure 3As shown. The water outlet control method is implemented by the thermal pool structure. When the water inlet temperature of the water heater is less than the preset threshold, the water outlet control method of this embodiment will be used. In this embodiment, the preset threshold of the water inlet temperature is twenty degrees. When the water inlet temperature of the water heater is greater than or equal to twenty degrees, there is no need to enable this function. Through program judgment, it can be known that it is summer at this time. In summer, because the ambient temperature is relatively high, it does not matter if there is a temperature drop after the water is turned off and then turned on. After the buffering of the pipeline and the room temperature, the temperature drop will be very small. At the same time, due to the high ambient temperature, the human body is less sensitive, and there is no obvious discomfort even with a large temperature difference. Therefore, no treatment is done in summer, which can reduce energy consumption and save more energy for users. In winter, it is just the opposite. The ambient temperature is low and the body is more sensitive. Among them, twenty degrees is not completely fixed, and it can also be adjusted according to the actual needs of the user.

[0068] The water outlet control method comprises:

[0069] S1. Preset a corresponding channel switching strategy based on the interval between the water-off operation and the water-on operation that are performed successively.

[0070] In this step, the time interval between when the water is turned on again and when the water is turned off last time is obtained, and the channel switching strategy is preset according to the time interval.

[0071] S2. Obtain the actual interval duration and match the corresponding target channel switching strategy.

[0072] S3. Based on the target channel connection strategy, control the channel in the thermal pool device to switch to the target heating channel for heating to achieve a water outlet temperature of the water heater within a preset range.

[0073] Wherein, the target heating channel includes a first heating channel corresponding to a rapid heating mode, or a second heating channel corresponding to an internal circulation heating mode.

[0074] After the water heater detects the water shut-off action, it will automatically turn on the internal circulation heating mode. When the water is turned on again, the time interval between this water turning on and the last water turning off will be obtained, and the control of the pipes in the thermal pool will be switched according to the time interval.

[0075] Specifically, the preset corresponding channel connection strategy based on the interval between the water-off operation and the water-on operation performed successively in sequence includes:

[0076] After the water is turned on and then off, the channel in the thermal pool is controlled to switch to the first heating channel.

[0077] If before the water is turned on again, the actual interval duration is greater than or equal to the preset duration. In the present embodiment, the preset duration is three minutes. In the program setting, after the water heater detects the water shut-off action, the circulating heating mode is automatically turned on. The water after circulating heating is injected into the thermal pool through the fourth pipe. When the circulating heating time reaches three minutes, the water level in the thermal pool will reach the floating plate structure. At this time, the water is turned on again, and the channel in the thermal pool is controlled to switch to the second heating channel. The water in the thermal pool is poured back into the first pipe through the hole structure of the first pipe to maintain the outlet water temperature within the preset range. When the water is turned on again, the first heating channel is closed.

[0078] Specifically, after the water is turned on and then turned off, the step of controlling the channel in the thermal pool to switch to the first heating channel includes:

[0079] When the water is boiling, the first pipeline is driven to open, and the second pipeline, the third pipeline, and the fourth pipeline are closed at the same time, so as to heat the water based on the first pipeline. At this time, the hot water in the pipeline after circulating heating can be used as a buffer to maintain the water temperature at the water outlet within a preset range.

[0080] If the actual interval time is greater than or equal to the preset time when the water is turned on again, in this embodiment, the preset time is three minutes. After three minutes of internal circulation heating, the circulating heated water is injected into the thermal pool through the fourth pipeline. At this time, the water level of the thermal pool will rise to the floating plate structure. The step of controlling the channel in the thermal pool to switch to the second heating channel includes:

[0081] Within a set time after the water is turned off, the first pipeline is driven to close, and at the same time the second pipeline, the third pipeline, and the fourth pipeline are opened to inject warm water generated by the internal circulation into the shell structure, and inject it into the first pipeline based on the water inlet unit, so that constant temperature water can be output from the first pipeline when the water is turned on again.

[0082] This embodiment controls the channel switching inside the thermal pool component to ensure a short first heating time and a fast heating speed. At the same time, after the water is turned off during the first heating, the water inside the thermal pool and the water in the heat exchange pipe are heated to ensure that there is no cold water section when the water is turned on again. The water temperature within three minutes can be guaranteed by circulating heating. After three minutes, the temperature drop problem can be alleviated by the water temperature buffer in the thermal pool. Overall, it can maximize the user experience while minimizing the number of heating times to reduce energy consumption. The three-minute time node mainly considers that the user's water outage time is generally no more than three minutes. During this time period, the user can use soap or shower gel, and the time is enough. If the time is longer, the energy consumption required for heating will be high, resulting in unnecessary energy waste.

Claims

1. A thermal pool device, characterized in that: The thermal pool device is integrated in the water heater, and comprises a shell structure, a channel structure penetrating the shell structure, and a driving mechanism; The channel structure includes a first pipeline and a second pipeline sharing the same water inlet, and a third pipeline and a fourth pipeline connected to the second pipeline; The water inlet is connected to the water outlet of the heat exchanger in the water heater, the water outlet of the first pipeline is connected to the water outlet of the water heater, and the first pipeline is provided with a water inlet unit; The water outlet end of the third pipeline is communicated with the internal circulation pipeline in the water heater, and the water outlet end of the fourth pipeline is located inside the shell structure; The driving mechanism is used to drive the first pipeline to open when the water is turned on, and the second pipeline, the third pipeline, and the fourth pipeline to close, so as to heat and discharge water based on the first pipeline; The driving mechanism is also used to drive the first pipeline to close within a set time after the water is turned off, and at the same time, the second pipeline, the third pipeline, and the fourth pipeline are opened, so as to inject warm water generated by the internal circulation into the shell structure, and inject it into the first pipeline based on the water inlet unit, so as to output constant temperature water from the first pipeline when the water is turned on again; The third pipeline and the fourth pipeline connected to the second pipeline include: The first heating channel formed by the first pipeline corresponds to a rapid heating mode; The second heating channel formed by the second pipeline, the third pipeline and the fourth pipeline corresponds to the internal circulation heating mode; The water inlet unit further comprises a plurality of hole structures axially arranged on the first pipeline and a floating plate structure matched with the plurality of hole structures, wherein the floating plate structure is fixedly arranged on the outer side of the first pipeline; The floating plate structure further comprises a baffle, a floating plate and a spring which are connected in sequence, and the spring is fixed on the side wall of the first pipeline; When the water level in the shell structure does not reach the position of the floating plate, the baffle is used to block the plurality of hole structures on the first pipeline; When the water level of the thermal pool reaches the position of the floating plate, the floating plate is pushed to drive the spring to move upward so that the hole structure is exposed, so that the water stored in the shell structure is injected into the first pipeline through the hole structure.

2. The thermal pool equipment according to claim 1, characterized in that: The driving mechanism comprises: The driving mechanism includes an electric valve provided at the intersection of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline, and a driving motor fixedly provided at a set position of the housing structure and electrically connected to the electric valve; The driving motor is used to drive the corresponding working state of the electric valve to perform channel switching based on different received control instructions.

3. The thermal pool equipment according to claim 1, characterized in that: The third pipeline and the fourth pipeline are arranged in sequence along a direction away from the water inlet.

4. A water heater, characterized in that: The water heater comprises the thermal pool device according to any one of claims 1-3.

5. A water outlet control method for a water heater, characterized in that: The water outlet control method is implemented by the water heater according to claim 4. When the water inlet temperature of the water heater is less than a preset threshold, the water outlet control method comprises: Based on the interval between the water-off operation and the water-on operation that are executed successively, a corresponding channel switching strategy is preset; When the water is turned on again, the actual interval duration is obtained and the corresponding target channel switching strategy is matched; Based on the target channel connection strategy, control the channel in the thermal pool device to switch to the target heating channel for heating so as to achieve a water outlet temperature of the water heater within a preset range; Wherein, the target heating channel includes a first heating channel corresponding to a rapid heating mode, or a second heating channel corresponding to an internal circulation heating mode.

6. The water outlet control method of a water heater according to claim 5, characterized in that: The preset corresponding channel connection strategy based on the interval between the water-off operation and the water-on operation performed successively in sequence includes: After the water is turned on and then off, the channel in the thermal pool is controlled to switch to the first heating channel; If the actual interval duration is greater than or equal to the preset duration when the water is turned on again, the channel in the thermal pool is controlled to switch to the second heating channel, and the first heating channel is controlled to be closed.

7. The water outlet control method of a water heater according to claim 6, characterized in that: After the water is turned on and then turned off, the step of controlling the channel in the thermal pool to switch to the first heating channel includes: When the water is boiling, the first pipeline is driven to open, and the second pipeline, the third pipeline, and the fourth pipeline are closed at the same time, so as to heat and discharge water based on the first pipeline; If the water is turned on again, the actual interval duration is greater than or equal to the preset duration, and the step of controlling the channel in the thermal pool to switch to the second heating channel comprises: Within a set time after the water is turned off, the first pipeline is driven to close, and at the same time the second pipeline, the third pipeline, and the fourth pipeline are opened to inject warm water generated by the internal circulation into the shell structure, and inject it into the first pipeline based on the water inlet unit, so that constant temperature water can be output from the first pipeline when the water is turned on again.

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