Instant electric water heater with anti-scalding function

Abstract

The instant electric water heater with the anti-scalding function comprises a heating body, the heating body is respectively connected with a water outlet pipe and a water inlet pipe, and a water inlet valve is arranged on the water inlet pipe. The bypass pipe is used for communicating the water inlet of the water inlet valve with the water outlet pipe, an electromagnetic valve used for controlling water flow is arranged on the bypass pipe, a capacity increasing cavity is formed in the water inlet of the water inlet valve, the input end of the bypass pipe is communicated with the water inlet of the water inlet valve, and the output end of the bypass pipe is communicated with the water outlet pipe. By arranging the bypass pipe, the electromagnetic valve and the capacity increasing cavity, when the water heater is started, waste heat water is mixed with cold water entering from the bypass pipe to be cooled, the capacity increasing cavity can achieve large-volume water storage at the water inlet of the water inlet valve, and the amount of cold water input into the water outlet pipe is fully guaranteed. And water flow output from the water outlet pipe is prevented from scalding a user.

Description

Technical Field

[0001] The utility model specifically relates to an instant electric water heater with an anti-scalding function. Background Art

[0002] Instant water heaters are also called fast or quick-heating water heaters. Their characteristics are: cold water in and hot water out. As long as the outlet valve is opened, hot water can be continuously supplied in a short time. When hot water is not needed, the outlet valve is closed to cut off the water path and the heating can be stopped in a short time. The principle of the electric heating instant water heater is to use a high-power electric heater (such as a heating tube) to quickly heat the cold water flowing through the heating area, so that it quickly reaches the predetermined use temperature, achieving the purpose of cold water in and hot water out.

[0003] When a user is using a water heater, it may be turned off and then turned on again. Before the water inlet or outlet valve is closed, the electric heater has already heated a portion of the water. This portion of water will remain at the electric heater because the water inlet or outlet valve is closed. As the electric heater itself has residual heat, the residual heat will heat this portion of water again, causing its temperature to rise. When the user opens the water outlet valve again, the water temperature may be too high and scald the user.

[0004] In response to the above problems, the existing design of reducing the temperature rise of waste heat in electric instant water heaters is usually achieved by using software program control to delay heating or adding a mixing valve at the water outlet. The former affects the constant temperature effect, the customer experience becomes worse, and the effect of reducing the temperature rise of waste heat is limited. The latter has the problems of increased cost and difficulty in operation. In addition, the water outlet is often hot and cold, and users are prone to mistakenly adjust the mixing valve to the high temperature end, causing burns to the human body. Summary of the invention

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model is to provide an anti-scalding function instant electric water heater, which can prevent scalding of users when the water heater is started to discharge water, thereby improving the safety of the water heater.

[0006] The utility model provides an instant electric water heater with an anti-scalding function, comprising a heating element, wherein the heating element is respectively connected to a water outlet pipe and a water inlet pipe, the water inlet pipe, the heating element and the water outlet pipe are sequentially connected to form a water flow pipeline of the electric water heater, the water inlet pipe is provided with a water inlet valve, the electric water heater also comprises a bypass pipe for connecting the water inlet of the water inlet valve with the water outlet pipe, and the bypass pipe is provided with a solenoid valve for controlling the water flow.

[0007] In addition, a capacity expansion chamber is provided on the water inlet of the water inlet valve, the input end of the bypass pipe is communicated with the water inlet of the water inlet valve, and the output end of the bypass pipe is communicated with the water outlet pipe.

[0008] Specifically, the water inlet valve includes a water valve and a stepper motor, and the stepper motor is installed on the water valve.

[0009] Specifically, it further includes a control board, and the control end of the heating element is connected to the control board.

[0010] Specifically, a water flow sensor is connected to the inlet end of the water inlet pipe.

[0011] Specifically, the water flow sensor is further provided with a water inlet temperature sensor.

[0012] Specifically, a water outlet temperature sensor is also provided at the outlet end of the water outlet pipe.

[0013] Specifically, the bypass pipe is connected to the side wall of the volume expansion chamber or the bypass pipe is connected to the bottom surface of the volume expansion chamber.

[0014] The beneficial effects of the utility model are as follows.

[0015] (1) The utility model is provided with a bypass pipe for connecting the water inlet of the water inlet valve with the water outlet pipe, and a solenoid valve for controlling the water flow is provided on the bypass pipe. When the water heater is started, although there is residual warm water in the heating element, the residual warm water is mixed with the cold water entering from the bypass pipe and cooled down, thereby preventing the water flow output from the water outlet pipe from scalding the user. During this period, the water flow can be controlled by the solenoid valve, and the bypass pipe can be closed after a certain period of time, so that the water heater enters the normal working state of the water flow pipeline formed by the water inlet, the heating element and the water outlet pipe.

[0016] (2) During this period, the utility model provides a capacity expansion chamber on the water inlet of the water inlet valve, the input end of the bypass pipe is connected to the water inlet of the water inlet valve, and the output end of the bypass pipe is connected to the water outlet pipe. The capacity expansion chamber can realize a larger volume of water storage at the water inlet of the water inlet valve, so that when the water heater is started, the bypass pipe has a larger water flow input, which fully guarantees the amount of cold water input to the water outlet pipe, and realizes the rapid mixing water cooling of the residual warm water output when the water heater is started.

[0017] (3) At the same time, the utility model can adjust the flow rate or flow time of the solenoid valve arranged on the bypass pipe according to external factors such as the power of the water heater and the temperature of the use environment, through the water heater control system or the user's own adjustment, so as to adjust the mixing time in the water outlet pipe, thereby achieving better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings.

[0019] Figure 1 It is a structural diagram of the first embodiment of the utility model.

[0020] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at point A.

[0021] Figure 3 yes Figure 2 The illustrated embodiment is a schematic diagram of the connection structure between the volume expansion chamber and the bypass pipe in a top view.

[0022] Figure 4 It is a schematic diagram of the second connection structure between the capacity expansion chamber and the bypass pipe described in the utility model.

[0023] The symbols shown in the drawings are as follows.

[0024] Heating element 1, solenoid valve 2, water outlet pipe 3, water outlet temperature sensor 4, control board 5, stepping motor 6, bypass pipe 7, water valve 8, capacity expansion chamber 801, water inlet pipe 9, water flow sensor 10, water inlet temperature sensor 11, water inlet valve 12. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] Reference below Figures 1 to 3 A scalding-proof instant electric water heater according to an embodiment of the utility model is described, comprising a heating element 1 and a control panel 5, wherein the heating element 1 is electrically connected to the control panel 5 and is controlled by the control panel 5. The heating element 1 is provided with a water outlet pipe 3 and a water inlet pipe 9 respectively, wherein the water inlet pipe 3, the heating element 1 and the water outlet pipe 3 are sequentially connected to form a water flow pipeline of the electric water heater, and a water inlet valve 12 is connected between the water inlet pipe 9 and the heating element 1. The water inlet valve 12 is a common accessory in water flow pipeline devices, and is used to control the water inlet of the water outlet pipe 3. The end of the water outlet pipe 3 is generally equipped with a water outlet faucet or connected to a shower. In the utility model, the heating element 1 refers to a unit body for heating water. When the water heater is in normal use, cold water enters from the water inlet pipe 9, and the cold water is then heated to hot water through the heating element 1, and the hot water is then output from the water outlet pipe 3.

[0027] Instant electric water heaters in the prior art have large power and generate a lot of heat energy instantly, while the water pipe is small. Often, after the water heater is turned off, a large amount of heat still remaining in the heating device (multiple heating water tanks) is absorbed by the very small amount of water retained in the heating body to form residual warm water. If the residual warm water does not have sufficient time to cool down naturally, the water temperature in the heating device will be more than ten or twenty degrees higher than the use temperature or even higher. When the water heater is started again, the user can easily be scalded by the residual warm water output instantly from the water outlet pipe 3. In order to solve the above problem, the utility model is provided with a bypass pipe 7 for connecting the water inlet of the water inlet valve 12 with the water outlet pipe 3. The bypass pipe 7 is provided with a solenoid valve 2 for controlling the water flow. The solenoid valve 2 keeps the water inlet of the water inlet valve 12 connected to the water outlet pipe 3 within a preset time when the electric water heater is started. When the water heater is started, although there is residual warm water in the heating element 1, the residual warm water is mixed with the cold water entering from the bypass pipe and cooled down, thereby preventing the water flow output from the water outlet pipe from scalding the user. During this period, the water flow is controlled by the solenoid valve to close the bypass pipe after a preset time, so that the water heater enters a normal working state in which a water flow pipeline is formed by the water inlet pipe 9, the heating element 1 and the water outlet pipe 3.

[0028] During this period, a capacity expansion chamber 801 is provided on the water inlet of the water inlet valve 12, the input end of the bypass pipe 7 is connected with the water inlet of the water inlet valve 12, and the output end of the bypass pipe 7 is connected with the water outlet pipe 3. The capacity expansion chamber 801 can realize a larger volume of water storage at the water inlet of the water inlet valve 12, so that when the water heater is started, the bypass pipe 7 has a larger water flow input, which fully guarantees the amount of cold water input to the water outlet pipe 3, and realizes the rapid mixed water cooling of the residual warm water output when the water heater is started.

[0029] This structure is mainly aimed at the heating element 1 outputting hot water twice in a short period of time. The temperature of the hot water exceeds the original design temperature. In order to better solve the problem of the water temperature exceeding the preset temperature during the secondary water output, a bypass pipe 7 is used to transport cold water to the water outlet pipe 3 to mix the hot water and cold water, thereby lowering the water temperature and avoiding scalding of the human body.

[0030] For the instant electric water heater of the utility model, the solenoid valve 2 is set at the factory or set by the user to be in a conductive state (even the maximum conductive state) when the electric water heater is started, and this state is maintained for the above-mentioned preset time, for example, one minute; at the same time, because the solenoid valve 2 can control the flow rate, within the above-mentioned preset time, the solenoid valve 2 can appropriately control the water intake by controlling the flow rate, thereby achieving the best water mixing effect in the water outlet pipe 3, and, for different seasons or geographical areas (such as temperate areas, cold areas; or plain areas, plateau areas), the above-mentioned cold water preset time (i.e., mixing time) can also be set manually by the control system of the electric water heater or the operator to prevent insufficient or excessive mixing of the water outlet pipe 3, so as to achieve the best water mixing effect.

[0031] When the instant electric water heater is in use, the solenoid valve 2 can be controlled to open or close by the control panel 5 and the water inlet valve 12. The control panel 5 is a control device for controlling the instant electric water heater. The control system involved in the utility model can be the control panel 5. When the water inlet valve 12 opens to inlet water and delivers cold water to the heating element 1, once the outlet pipe 3 discharges residual warm water instantly, the solenoid valve 2 is in an open and conductive state, that is, the bypass pipe 7 is in a conductive state, which allows the cold water to mix with the hot water in the outlet pipe 3, so that the water temperature reaches a specified value. After a preset time, the solenoid valve 2 is closed, so that the cold water no longer flows through the bypass pipe 7, effectively solving the problem of excessively high discharged water temperature. During this period, for safety reasons, when the electric water heater is started, regardless of whether there is residual warm water in the heating element 1 (if the water heater is stopped for a long enough time, the residual warm water will be fully naturally dissipated and cooled), the solenoid valve will be in an open and conductive state, and cold water will be injected into the outlet pipe 3 to ensure that the water flow output by the cold water pipe 3 will not cause scalding to the user.

[0032] The use environment of the water heater is changeable. The water inlet temperature may be different each time the water heater is used. While solving the problem of anti-scalding of the water outlet, if the same hot and cold water mixing ratio is used when the water inlet temperature is very low, if the water is turned on and off during the bath, the mixed water will be relatively cold. In order to improve the comfort of use, the control board 5 controls the water valve 8 and the solenoid valve 2 through the inlet and outlet water temperatures and other conditions, and can also implement a more reasonable distribution of the ratio of the water inlet flow of the heating element 1 and the water flow of the bypass pipe 7, so that the water temperature of the outlet pipe 3 is more stable.

[0033] During this period, the heating element 1 includes a water tank and a heating pipe. The heating pipe is located in the water tank and heats the cold water in the water tank. The hot water is discharged from the water outlet pipe 3. The water inlet valve includes a water valve 8 and a stepper motor 6. The stepper motor 6 is installed on the water valve 8. The stepper motor 6 pushes the valve in the water valve 8 to open or close. The inlet end of the water inlet pipe 9 of this structure is connected to a water flow sensor 10, and the detection end of the water flow sensor 10 is connected to the control board 5. The water flow sensor 10 is used to detect the water flow, and the information of the water flow is fed back to the control board 5. The water flow sensor 10 and the control board 5 are connected by a wire.

[0034] The water flow sensor 10 of this structure is also provided with a water inlet temperature sensor 11, and the water inlet temperature sensor 11 is connected to the control board 5. The water inlet temperature sensor 11 is used to detect the temperature of cold water, and the water temperature information is fed back to the control board 5, and the water inlet temperature sensor 11 is connected to the control board 5 through a wire.

[0035] The outlet end of the water outlet pipe 3 of the present structure is also provided with an outlet water temperature sensor 4, which is connected to the control board 5. The outlet water temperature sensor 4 is used to detect the water temperature of the outlet water, and the water temperature information of the outlet water is fed back to the control board 5, and the outlet water temperature sensor 4 and the control board 5 are connected by a wire.

[0036] In the water flow pipeline shown in the embodiment, the volume expansion chamber 801 is arranged at the front side and the rear side of the water inlet pipe body of the water valve 8. The volume expansion chamber 801 is arranged as an inner cavity blind hole structure protruding outward, and the bypass pipe 7 is connected to the volume expansion chamber 801 at the rear side of the water inlet pipe body of the water valve 8. Figures 1 to 3 As shown, during this period, the bypass pipe 7 can be selectively welded to the volume expansion chamber 801. In this embodiment, based on the fact that the volume expansion chamber 801 protrudes toward the rear, in order to avoid the bypass pipe 7 turning backward first and then downward when connected, the bypass pipe 7 is directly set downward during welding, that is, it is welded and connected to the volume expansion chamber 801 at 90 degrees; and in structures other than this embodiment, under the premise that the pipeline allows, as an optimization of the pipeline, the volume expansion chamber 801 is set at the bottom of the water inlet pipe body of the water valve 8, as shown in FIG. Figure 4 As shown, relative to Figure 2 The rear part is rotated 90 degrees downward and forward as shown, and the volume expansion chamber 801 is a blind hole structure of the inner cavity protruding downward. At this time, the bypass pipe 7 is connected to the bottom surface of the volume expansion chamber 801, and its connection method can be the welding method mentioned above. The volume expansion chamber 801 is arranged at the bottom of the water inlet pipe body of the water valve 8, and the bypass pipe 7 can also be a direct-flow guide pipe downward, and the water flows directly downward into the bypass pipe 7 to avoid the following Figures 1 to 3 In the illustrated embodiment, the water flow will turn in the volume expansion chamber 801, thereby avoiding abnormal water flow noise (such as turbulence) caused by the water flow turning.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An instant electric water heater with an anti-scalding function, comprising a heating element (1), the heating element (1) being connected to a water outlet pipe (3) and a water inlet pipe (9), respectively, the water inlet pipe (9), the heating element (1) and the water outlet pipe (3) being sequentially connected to form a water flow pipeline of the electric water heater, the water inlet pipe (9) being provided with a water inlet valve (12), characterized in that: It also includes a bypass pipe (7) for connecting the water inlet of the water inlet valve (12) with the water outlet pipe (3), and the bypass pipe (7) is provided with a solenoid valve (2) for controlling the water flow rate; A capacity expansion chamber (801) is provided on the water inlet of the water inlet valve (12), the input end of the bypass pipe (7) is in communication with the water inlet of the water inlet valve (12), and the output end of the bypass pipe (7) is in communication with the water outlet pipe (3).

2. The instant electric water heater with anti-scalding function according to claim 1, characterized in that: The water inlet valve (12) comprises a water valve (8) and a stepping motor (6), wherein the stepping motor (6) is mounted on the water valve (8).

3. The instant electric water heater with anti-scalding function according to claim 1, characterized in that: It also includes a control board (5), and the control end of the heating element (1) is connected to the control board (5).

4. The instant electric water heater with anti-scalding function according to any one of claims 1 to 3, characterized in that: The inlet end of the water inlet pipe (9) is connected to a water flow sensor (10).

5. The instant electric water heater with anti-scalding function according to claim 4, characterized in that: The water flow sensor (10) is also provided with a water inlet temperature sensor (11).

6. The instant electric water heater with scalding protection function according to any one of claims 1 to 3, characterized in that: The outlet end of the water outlet pipe (3) is also provided with an outlet water temperature sensor (4).

7. The instant electric water heater with scalding protection function according to any one of claims 1 to 3, characterized in that: The bypass pipe (7) is connected to the side wall of the volume expansion chamber (801) or the bypass pipe (7) is connected to the bottom surface of the volume expansion chamber (801).

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