Storage type secondary mixing anti-scalding instant electric water heater

Abstract

The utility model particularly relates to a storage type secondary mixing anti-scalding instant electric water heater which comprises a heating body, the heating body is respectively provided with a water outlet pipe and a water inlet pipe, the water inlet pipe is provided with a water inlet valve, the water outlet pipe is connected with the water inlet pipe through a bypass pipe, and the bypass pipe is provided with an electromagnetic valve playing a storage and retention role. The water outlet pipe is further provided with a water storage tank used for prolonging the mixing time of cold water and hot water, and a water outlet of the water storage tank is connected with a water outlet temperature sensor. Hot water and cold water are output for the first time through storage and retention of the water storage tank, long-time secondary mixing of the hot water and the cold water can be achieved, it is ensured that the temperature of water output by the water storage tank reaches the specified temperature, and the anti-scald effect is improved.

Description

Technical Field

[0001] The utility model specifically relates to a storage type secondary mixing anti-scalding instant electric water heater. 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 applicant has filed a patent application: an instant electric water heater with an anti-scalding function, including a heating element, each of which is provided with a water outlet pipe and a water inlet pipe, a water inlet valve is connected between the water inlet pipe and the heating element, and a capacity expansion chamber is also provided on the water inlet of the water inlet valve. The water outlet pipe and the capacity expansion chamber are connected by a bypass pipe, and the bypass pipe is provided with a solenoid valve for controlling the water flow rate, thereby achieving an anti-scalding effect.

[0005] However, there are still some imperfections in the use process. The retention time of hot water and cold water in the water outlet pipe is still relatively short, which affects the mixing time of hot and cold water. The water temperature output each time has not reached the target value. In addition, the instant electric water heater is small in size and the internal space is very compact. The length of the water outlet pipe is subject to certain restrictions and it is impossible to set the water outlet pipe longer. When the water flow is in a faster state, the mixing time implemented by extending the water outlet pipe is basically negligible. Therefore, the structure needs to be further improved in structure to solve the problem of excessively high water temperature each time the water is discharged. Summary of the invention

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a storage type secondary mixing anti-scalding instant electric water heater, which can make the cold and hot water retain longer and be fully mixed twice, to ensure that the user is prevented from being scalded each time the water is discharged, and to improve the safety of the water heater.

[0007] A storage - type secondary - mixing anti - scalding instant - heating electric water heater according to the present utility model includes a heating element. The heating element is respectively provided with an outlet pipe and an inlet pipe. An inlet valve is connected between the inlet pipe and the heating element. The outlet pipe and the inlet pipe are connected through a bypass pipe. The bypass pipe is provided with a solenoid valve for controlling the water flow rate. An outlet pipe is also provided with a water storage tank for extending the cold - hot water mixing time. An outlet water temperature sensor is connected to the outlet of the water storage tank.

[0008] Specifically further, an extension pipe is provided in the water storage tank. One end of the extension pipe extends outside the water storage tank and the outlet of the outlet pipe is lower than the inlet of the top end of the extension pipe. The extended part of the extension pipe is provided with an outlet water temperature sensor.

[0009] Specifically further, a gap is left between the extension pipe and the top wall inside the water storage tank.

[0010] Specifically further, the outlet of the outlet pipe is connected to the outer surface of the water storage tank and the outlet pipe is communicated with the inner cavity of the water storage tank.

[0011] Specifically further, the extension pipe is welded to the bottom surface of the water storage tank.

[0012] Specifically further, the extension pipe is located at the middle position of the water storage tank.

[0013] The beneficial effects of the present utility model are as follows: The present utility model realizes the storage and retention of the first - output hot water and cold water through the water storage tank, enables the hot water and cold water to achieve a longer - time secondary mixing, ensures that the water temperature output from the water storage tank reaches the specified temperature, and improves the anti - scalding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above - mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings.

[0015] Figure 1 is the structural diagram of the present utility model.

[0016] Figure 2 is the schematic connection structure diagram of the water storage tank and the outlet water temperature sensor.

[0017] The markings shown in the figure are as follows: heating element 1, solenoid valve 2, outlet pipe 3, outlet water temperature sensor 4, control board 5, inlet valve 6, bypass pipe 7, water storage tank 8, inlet pipe 9, water flow sensor 10, inlet water temperature sensor 11. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0019] Reference will be made below Figure 1 and Figure 2 to describe a retention - type secondary - mixing anti - scalding instant - heating electric water heater according to an embodiment of the present utility model. It includes a heating element 1. The heating element 1 is respectively provided with a water outlet pipe 3 and a water inlet pipe 9. An inlet valve 6 is provided on the water inlet pipe 9. The water outlet pipe 3 and the water inlet pipe 9 are connected by a bypass pipe 7. The bypass pipe 7 is provided with a solenoid valve 2 for controlling the water flow rate. The inlet valve 6, as a water flow regulating valve in the water flow pipeline device, is used to regulate and control the water inlet flow rate or on - off of the water outlet pipe 3. The end of the water outlet pipe 3 is generally installed with a water outlet faucet or connected to a shower head. In the present utility model, the heating element 1 refers to a unit for heating water. When the water heater is in normal use, cold water enters from the water inlet pipe 9, and then the cold water is heated into hot water by passing through the heating element 1, and then the hot water is output from the water outlet pipe 3.

[0020] Regarding the heating technology of existing instant - heating electric water heaters, due to the relatively large power, a large amount of heat is generated instantaneously. And the flow - through water pipe is not suitable to be too large. The heating element and the heat - insulating or protective medium have a certain heat - storage performance. After turning off the water during the use of the water heater, a large amount of heat will still be stored in the heating element and the heat - insulating or protective medium, which will heat the water remaining in the heating body to form residual - heat high - temperature water. This residual - heat high - temperature water may be ten to twenty degrees or even higher than the normal use temperature of the water heater. If there is not enough time for natural cooling, when the water heater is restarted, the user is easily scalded by the residual - heat high - temperature water instantaneously output from the water outlet pipe 3.

[0021] To solve the above problems, a water storage tank 8 for storage and retention is also provided at the water outlet of the water outlet pipe 3, and a bypass pipe 7 is additionally provided. When the heating element 1 outputs hot water, the bypass pipe 7 conveys cold water to the water outlet pipe 3. The hot water and cold water simultaneously form the first cold - hot water mixing at the intersection between the bypass pipe 7 and the water outlet pipe 3, achieving a preliminary cooling effect. They continue to mix in the water outlet pipe 3 and then enter the water storage tank 8 again. The water storage tank 8 stores and retains the incoming hot water and cold water. The hot water and cold water in the water storage tank 8 are mixed for the second time to prevent the occurrence of cold - hot stratified water. The water temperature after the second full mixing reaches the preset temperature, and then warm water is output from the water storage tank 8, improving the anti - scalding effect. A water outlet temperature sensor 4 is connected to the water outlet of the water storage tank 8, and the water temperature sensor 4 finally detects the water temperature of the warm water.

[0022] In addition, for the instant electric water heater of the present utility model, the solenoid valve 2 is set at the factory or by the user's own operation to be in a conducting state (even the maximum conducting amount) when the water heater is started, and this state is maintained for the above-mentioned preset time, such as one minute. At the same time, since the solenoid valve 2 can control the flow rate, within the above-mentioned preset time, the solenoid valve 2 can appropriately control the water inlet amount by controlling the flow rate, so as to achieve the best water mixing effect in the outlet pipe 3. Moreover, for different seasons or geographical regions (such as temperate regions, cold regions; or plain regions, plateau regions), the above-mentioned cold water preset time (i.e., the water mixing time) can also be set through the control system of the water heater or manually by the operator to prevent the situation of insufficient or excessive water mixing in the outlet pipe 3, so as to achieve the best water mixing effect.

[0023] An extension pipe 801 is provided in the water storage tank 8 of the present structure. One end of the extension pipe 801 extends outside the water storage tank 8, and the water outlet of the outlet pipe 3 is lower than the water inlet at the top end of the extension pipe 801, which can increase the distance between the water outlet position of the outlet pipe 3 and the extension pipe 801, extend the flowing time, and better mix cold and hot water. Moreover, the water inlet position at the top end of the extension pipe 801 can control the water level in the water storage tank 8. A water outlet temperature sensor 4 is provided on the extended part of the extension pipe 801. A gap is left between the extension pipe 801 and the top wall inside the water storage tank 8 to control the water outlet amount of the extension pipe 801. In addition, the water outlet of the outlet pipe 3 is connected to the outer surface of the water storage tank 8 and the outlet pipe 3 is communicated with the inner cavity of the water storage tank 8. Or, the water outlet of the outlet pipe 3 is located inside the inner cavity of the water storage tank 8. The extension pipe 801 is welded to the bottom surface of the water storage tank 8 to prevent leakage and reduce the use of sealing rings. The extension pipe 801 of the present structure is located at the middle position of the water storage tank 8, which can make the water storage space of the water storage tank 8 more uniform and make the cold and hot water mixing space more reasonable.

[0024] In addition to the core functions of the above structure described in this embodiment, the following further explains the remaining parts.

[0025] The usage environment of the water heater is changeable, and the inlet water temperature may be different each time the water heater is used. While solving the problem of anti-scalding, when the inlet water temperature is very low, if the same cold and hot water mixing ratio is adopted, if the water is switched on and off during bathing, the water mixed at this time is relatively cold. To improve the usage comfort, the control board 5 controls the water valve 8 and the solenoid valve 2 according to conditions such as the inlet water temperature and the outlet water temperature, and implements a more reasonable distribution of the proportion of the inlet water flow rate of the heating element 1 and the water flow rate of the bypass pipe 7, so that the water temperature in the outlet pipe 3 is more stable.

[0026] This embodiment further includes a control board 5, and the control end of the heating element 1 is connected to the control board 5. For the structure described herein, the inlet end of the water inlet pipe 9 is connected with 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 rate, and the information of the water flow rate is fed back to the control board 5. The water flow sensor 10 and the control board 5 are connected by wires. The water flow sensor 10 of this structure is further provided with an inlet water temperature sensor 11, and the inlet water temperature sensor 11 is connected to the control board 5. The inlet water temperature sensor 11 is used to detect the temperature of the cold water, and the temperature information of the water is fed back to the control board 5. The inlet water temperature sensor 11 and the control board 5 are connected by wires. For the structure described herein, the outlet end of the water outlet pipe 3 is further provided with an outlet water temperature sensor 4, and the water temperature sensor 4 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. The outlet water temperature sensor 4 and the control board 5 are connected by wires.

[0027] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A retention-type secondary mixing anti-scald instant electric water heater, comprising a heating element (1), the heating element (1) is respectively provided with a water outlet pipe (3) and a water inlet pipe (9), a water inlet valve (6) is provided on the water inlet pipe (9), the water outlet pipe (3) and the water inlet pipe (9) are connected by a bypass pipe (7), and a solenoid valve (2) for controlling the water flow is provided on the bypass pipe (7), characterized in that: At the water outlet of the water outlet pipe (3), there is also a water storage tank (8) that plays a role in storing and retaining water. At the water outlet of the water storage tank (8), a water outlet temperature sensor (4) is connected.

2. The instant electric water heater with heat storage type secondary mixing and anti-scalding according to claim 1, characterized in that: An extension pipe (801) is provided in the water storage tank (8). One end of the extension pipe (801) extends outside the water storage tank (8), and the water outlet of the water outlet pipe (3) is lower than the water inlet at the top end of the extension pipe (801). The extended part of the extension pipe (801) is provided with a water outlet temperature sensor (4).

3. The instant electric water heater with heat insulation and secondary mixing according to claim 2, wherein: A gap is left between the extension pipe (801) and the top end inside the water storage tank (8).

4. The instant heating electric water heater with heat retention and secondary mixing and anti-scalding according to claim 2, characterized in that: The water outlet of the water outlet pipe (3) is connected to the outer surface of the water storage tank (8), and the water outlet pipe (3) is communicated with the inner cavity of the water storage tank (8).

5. The instant electric water heater with heat retention and secondary mixing for anti-scalding according to claim 3 or 4, characterized in that: The extension pipe (801) is welded to the bottom surface of the water storage tank (8).

6. The instant - heating electric water heater with heat - retention type secondary mixing and anti - scalding according to claim 3 or 4, characterized in that: The extension pipe (801) is located at the middle position of the water storage tank (8).

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