CN204923410U - Electric water heater - Google Patents

Abstract

The utility model discloses an electric water heater, electric water heater includes water tank, heating device, a temperature sensor, the 2nd temperature sensor and controller, the 2nd temperature sensor with a temperature sensor is corresponding to be located two positions of upper and lower spaced of water tank, heating device includes the primary heater, the controller basis the falling speed of a temperature sensor determine's temperature controls primary heater work, when user's water, the inlet tube to water injection in the water tank is located the below a temperature sensor at first detects the decline of temperature, so that controller in time control is opened the primary heater is with right water in the water tank heats, avoids the temperature of the lower part of water tank is too low, the hydrothermal temperature of the follow -up supply of electric water heater is unstable, and influences the comfort level that the user used.

Description

water heater

technical field

The utility model relates to the technical field of household appliances, in particular to an electric water heater.

Background technique

At present, storage-type electric water heaters are mostly heated by electric water heaters, and the required water temperature is set before use. When the water temperature reaches the preset water temperature, the temperature control device of the electric water heater (the temperature control device is arranged A specific position, such as being arranged in the middle of the inner tank) controls to disconnect the power supply of the electric water heater and stop heating. When the water temperature drops to a certain temperature, the temperature control device of the electric water heater restarts the electric water heater for heating, and the cycle repeats. Due to the natural convection characteristics of water, the water in the inner tank is layered (hot water in the upper part and cold water in the lower part) during heating and use by the user. The hot water will be replenished into the upper part of the inner tank. Therefore, it takes a long time for the temperature sensed by the temperature control device of the inner tank to drop to a certain value, and then the electric water heater is started to work. In this way, the electric water heater is started late, and the The amount of hot water output by the electric water heater is less, which cannot meet the needs of users.

At present, in order to start the heater as early as possible when the user uses water, there are two commonly used methods:

One is to add a temperature sensor at the water outlet pipe of the electric water heater, and use the temperature change of the water outlet pipe to judge whether the user is using water, so as to start the heater to work. This control method, because the water outlet pipe is a plastic part, the heat transfer is slow At the same time, using a temperature sensor can not effectively judge the various changes of the water temperature in the inner tank, which is easy to cause misjudgment.

Another method is to add a flow sensor at the front end of the water inlet pipe. When the user has water demand, it can sense and control the heater in time. The disadvantage of this control method is that the water flow sensor is expensive and bulky. There is also room for improvement.

Utility model content

The main purpose of the utility model is to provide an electric water heater, aiming at solving the problem that the current electric water heater starts relatively slowly.

In order to achieve the above technical purpose, the utility model provides an electric water heater, which includes a water tank, a heating device, a first temperature sensor, a second temperature sensor and a controller, the second temperature sensor and the first The temperature sensor is correspondingly arranged at two positions spaced up and down of the water tank to detect the water temperature at different depths in the water tank, the heating device is arranged in the water tank, the controller and the heating device, The first temperature sensor and the second temperature sensor are electrically connected to control the operation of the heating device according to the temperature values detected by the first temperature sensor and the second temperature sensor, and the heating device A first heater is included, and the controller controls the operation of the first heater according to the temperature drop rate detected by the first temperature sensor.

Preferably, the water tank includes a lower part, a middle part and an upper part divided into three equal parts along the depth direction of the inner cavity of the water tank.

Preferably, the first heater and the first temperature sensor are arranged at the lower part of the water tank, and the second temperature sensor is arranged at the middle part of the water tank.

Preferably, the first heater and the first temperature sensor are arranged near the bottom of the water tank.

Preferably, the heating device further includes a second heater, the second heater is arranged in the middle of the water tank, and the controller is also electrically connected to the second heater for The temperature value of the second temperature sensor is used to control the operation of the second heater.

Preferably, the first temperature sensor is arranged on the outer surface of the water tank.

Preferably, the electric water heater further includes a heat transfer pipe protruding into the water tank and located in the middle of the water tank, and the second temperature sensor is arranged in the heat transfer pipe.

Preferably, the electric water heater further includes a third temperature sensor, the third temperature sensor is arranged on the upper part of the water tank, and the controller is electrically connected with the third temperature sensor to further The temperature values detected by the three temperature sensors are used to control the operation of the second heater.

Preferably, the heating device further includes a third heater arranged on the upper part, and the controller is electrically connected to the third heater to control the temperature according to the temperature value of the third temperature sensor. The third heater works.

Preferably, the third temperature sensor is arranged on the outer surface of the water tank.

The electric water heater provided by the utility model includes a water tank, a heating device, a first temperature sensor, a second temperature sensor and a controller. position, to detect the water temperature at different depths in the water tank, the heating device is arranged in the water tank, the controller and the heating device, the first temperature sensor and the second temperature sensor Electrically connected, used to control the operation of the heating device according to the temperature values detected by the first temperature sensor and the second temperature sensor, the heating device includes a first heater, and the controller according to the The temperature drop speed detected by the first temperature sensor is used to control the operation of the first heater. When the user uses water, the water inlet pipe injects water into the water tank, and the first temperature sensor located below first detects the temperature drop. , so that the controller can control and turn on the first heater in time to heat the water in the water tank, avoiding that the water temperature in the lower part of the water tank is too low, and the hot water supplied by the electric water heater subsequently The temperature is unstable, which affects the comfort of the user.

Description of drawings

Fig. 1 is the schematic diagram of an embodiment of the electric water heater provided by the utility model;

Fig. 2 is a schematic flowchart of a heating method for the electric water heater shown in Fig. 1 .

The realization of the purpose of the utility model, functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments of the description. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides an electric water heater, Fig. 1 is an embodiment of the electric water heater provided by the utility model, Fig. 2 is a flow chart of the heating method of the electric water heater provided in Fig. 1, please refer to Fig. 1 to Fig. 2, the The electric water heater 100 includes a casing 1 and a water tank 2, the water tank 2 is used to store hot water, and the water in the water tank 2 is distributed in layers, which is specifically shown as: the temperature of the water at the upper position in the water tank 2, It is higher than the temperature of the water at the lower position in the water tank 2, that is, it is hot on the top and cool on the bottom. The water tank 2 is equipped with a water inlet pipe 21 and a water outlet pipe 22, and the water inlet pipe 21 extends from the bottom of the water tank 2 to the upper part of the inner cavity of the water tank 2 to discharge the heat of the upper layer in the water tank 2. Water, the outlet pipe 22 extends from the bottom to the inner cavity of the water tank 2 and is arranged near the bottom of the water tank 2, so as to supply the water tank 2 with an external water source (usually tap water and relatively low temperature).

The electric water heater 100 also includes a heating device (in this embodiment, the heating device includes 31 , 32 and 33 ), a first temperature sensor 41 , a second temperature sensor 42 and a controller 5 . The second temperature sensor 42 and the first temperature sensor 41 are correspondingly arranged at two positions spaced apart from each other up and down of the water tank 2, that is, arranged in layers, so as to detect water temperatures at different depths in the water tank 2, wherein The position of the second temperature sensor 42 can be set according to the position of the temperature sensor in the traditional electric water heater. This design is equivalent to adding another first temperature sensor 41 below the traditionally set second temperature sensor 42. Can.

The heating device is arranged in the water tank 2, and the controller 5 is electrically connected with the heating device, the first temperature sensor 41 and the second temperature sensor 42, for The temperature value detected by the sensor 41 and the second temperature sensor 42 is used to control the operation of the heating device, the heating device includes the first heater 31, the heating device can only be provided with the first heater 31, and The position of the first heater 31 can be the same as that of the current electric water heater. The controller 5 controls the first heater 31 to work according to the temperature drop rate detected by the first temperature sensor 41 .

When the user opens the water switch of the water outlet pipe 22, the hot water in the upper layer of the water tank 2 is output through the water outlet pipe 22, and at the same time, the cold water from the outside enters the water tank 2 through the water inlet pipe 21, and the The temperature of the water in the water tank 2 gradually decreases from bottom to top, that is, the temperature of the water in the lower part of the water tank 2 decreases first, and slowly, the temperature of the water in the middle and upper part of the water tank 2 also gradually decreases. Therefore, the first temperature sensor 41 located below the second temperature sensor 42 senses the drop of the water temperature in the water tank 2 before the second temperature sensor 42, and generates a sensing signal, The controller 5 analyzes the temperature drop rate of the first temperature sensor 41 according to the sensing signal to determine whether the user opens the water outlet pipe 22 with water (when the temperature drop rate of the first temperature sensor 41 is too large , indicating that there is cold water injection and hot water output), therefore, the first heater 31 can be turned on for heating as soon as possible while the cold water is mixed in, and then the water in the water tank 2 can be heated in time. heating, avoiding that the water temperature in the lower part of the water tank 2 is too low, and the temperature of the hot water subsequently supplied by the electric water heater is unstable, which affects the comfort of the user.

In this embodiment, the water tank 2 includes a lower part, a middle part and an upper part divided into three equal parts along the depth direction of the inner cavity of the water tank 2. Obviously, the present design is not limited thereto. The lower part, the middle part and the lower part The upper part can also be divided according to other ratios, and the division of the lower part, the middle part and the upper part is related to the size of the water tank 2, the temperature of the external water source, the water intake and discharge speed of the water tank 2, and the like.

In this embodiment, the first heater 31 and the first temperature sensor 41 are set at the lower part of the water tank 2, and the second temperature sensor 42 is set at the middle of the water tank 2, wherein the first The closer the temperature sensor 41 is to the bottom of the water tank 2, the sooner it can sense that the water tank 2 is injecting cold water from the water inlet pipe 21, and the sooner the controller 5 can control the first heater 31 to the water tank 2. The water in the water tank 2 is heated. Therefore, in this embodiment, specifically, the first heater 31 and the first temperature sensor 41 are arranged near the bottom of the water tank 2 .

Specifically, in this embodiment, in order to facilitate the installation of the first temperature sensor 41, the first temperature sensor 41 is arranged on the outer surface of the water tank 2, in order to ensure that the water temperature detected by the second temperature sensor 42 The electric water heater 100 also includes a heat transfer tube 6 protruding into the water tank 2 and located in the middle of the water tank 2 , and the second temperature sensor 42 is arranged in the heat transfer tube 6 . Obviously, this design is not limited thereto. Similarly, in order to enhance the accuracy of the first temperature sensor 41 in detecting the water temperature in the water tank 2, the first temperature sensor 41 can also be arranged inside the water tank 2, And specifically, the first temperature sensor 41 can be arranged inside the water tank 2 and located in the heat transfer tube at the lower part of the water tank 2. In addition, in order to facilitate the installation of the second temperature sensor 42, the The second temperature sensor 42 can also be arranged on the outer surface of the water tank 2 .

In this embodiment, the heating device further includes a second heater 32, the second heater 32 is located in the middle of the water tank 2, and the controller 5 is also electrically connected to the second heater 32. connected to control the operation of the second heater 32 according to the temperature value of the second temperature sensor 42, specifically, when the temperature value of the second temperature sensor 42 is too low, the controller 5 The second heater 32 is controlled to perform heating. Therefore, the first heater 31 can be turned on to heat the water in the lower part of the water tank 2, and then the second heater 32 can be turned on to heat the water in the middle of the water tank 2, so as to heat the water in the lower part of the water tank 2. The water in the water tank 2 is heated in layers to ensure the temperature stability of the water temperature in each layer in the water tank 2 , thereby ensuring the stability of the temperature of the hot water supplied by the electric water heater 100 .

In this embodiment, the electric water heater 100 further includes a third temperature sensor 43, the third temperature sensor 43 is arranged on the upper part of the water tank 2, and the controller 5 is electrically connected to the third temperature sensor 43. connected to control the operation of the second heater 32 according to the temperature detected by the third temperature sensor 43 . Therefore, when the temperature of the water in the upper part of the water tank 2 detected by the third temperature sensor 43 is too high, the second temperature sensor 42 can be controlled to stop heating, so as to ensure safety.

In addition, in this embodiment, the heating device further includes a third heater (not shown) arranged on the upper part, and the controller 5 is electrically connected to the third heater for The temperature value of the third temperature sensor 43 is used to control the operation of the third heater. Specifically, when the third temperature sensor 43 detects that the water temperature in the upper part of the water tank 2 is lower than a certain set value When low, the controller 5 controls the third heater to heat, so that the heating levels in the water tank 2 are more (three layers), thereby, the water temperature of each layer in the water tank 2 can be further enhanced. Stability, thus further ensuring the stability of the temperature of the hot water supplied by the electric water heater 100 .

The above are only preferred embodiments of the present utility model, and are not intended to limit the scope of patents. Any equivalent structure or equivalent process transformation made by using the description of the utility model and the accompanying drawings is directly or indirectly used in other related technical fields. All are included in the scope of patent protection of the utility model in the same way.

Claims (10)

1. An electric water heater, characterized in that, the electric water heater comprises a water tank, a heating device, a first temperature sensor, a second temperature sensor and a controller, and the second temperature sensor and the first temperature sensor are correspondingly arranged on The two positions spaced up and down of the water tank are used to detect the water temperature at different depths in the water tank, the heating device is arranged in the water tank, and the controller is connected with the heating device and the first temperature The sensor and the second temperature sensor are electrically connected to control the operation of the heating device according to the temperature values detected by the first temperature sensor and the second temperature sensor, and the heating device includes a first heater , the controller controls the operation of the first heater according to the temperature drop rate detected by the first temperature sensor. 2. The electric water heater according to claim 1, wherein the water tank comprises a lower part, a middle part and an upper part divided into three equal parts along the depth direction of the inner cavity of the water tank. 3. The electric water heater according to claim 2, wherein the first heater and the first temperature sensor are arranged at the lower part of the water tank, and the second temperature sensor is arranged at the middle part of the water tank. 4. The electric water heater according to claim 3, wherein the first heater and the first temperature sensor are arranged near the bottom of the water tank. 5. The electric water heater according to claim 3, wherein the heating device further comprises a second heater, the second heater is arranged in the middle of the water tank, and the controller is also connected with the first The two heaters are electrically connected to control the operation of the second heater according to the temperature value of the second temperature sensor. 6. The electric water heater according to claim 3, wherein the first temperature sensor is arranged on the outer surface of the water tank. 7. The electric water heater according to claim 3, characterized in that, the electric water heater further comprises a heat transfer tube protruding into the water tank and located in the middle of the water tank, and the second temperature sensor is located at the inside the heat transfer tube. 8. The electric water heater according to claim 5, characterized in that, the electric water heater further comprises a third temperature sensor, and the third temperature sensor is arranged on the upper part of the water tank to detect the temperature of the upper part of the water tank. Water temperature, the controller is electrically connected to the third temperature sensor, and is used to control the operation of the second heater according to the temperature value detected by the third temperature sensor. 9. The electric water heater according to claim 8, wherein the heating device further comprises a third heater arranged on the upper part, and the controller is electrically connected to the third heater for The operation of the third heater is controlled according to the temperature value of the third temperature sensor. 10. The electric water heater according to claim 8, characterized in that, the third temperature sensor is arranged on the outer surface of the water tank.