TWI558956B - Electric water heater heating structure and method of heating the article - Google Patents

Description

Electric water heater heating structure and method thereof

The invention provides a heating structure and a method thereof for an electric water heater, in particular to a heating structure and a method for a heat storage water heater having a shroud device.

Traditional gas water heaters use liquefied petroleum gas or natural gas as fuel, but as the price of liquefied petroleum gas and natural gas continues to rise, the cost of obtaining hot water is increasing, and the use of electric water heaters is safe, and emissions are low. The advantage is that electric water heaters are still an important way to provide hot water.

The conventional electric water heater is provided with a heating rod as a heat source in the inner tank to heat the cold water. However, since the heating rod is only disposed in a local area in the inner tank, the water in the inner tank is heated unevenly, so the water is moderate in temperature. The heating effect is not good enough to achieve the effect of rapid heating, and the amount of hot water discharged is small.

In summary, the present inventors have felt that the above-mentioned defects can be improved, and the present invention has been put forward with great interest in designing and cooperating with the theory, and finally proposes a invention which is reasonable in design and effective in improving the above-mentioned defects.

The technical problem to be solved by the invention is to provide an electric water heater heating structure and a method thereof, which can form a forced circulation to achieve the effect of quick heat and hot water discharge. fruit.

In order to solve the above technical problem, the present invention provides an electric water heater heating structure, comprising: a liner; an inlet pipe, the inlet pipe is disposed in the liner; and an outlet pipe, the outlet pipe is disposed in the liner; At least one heating rod, the at least one heating rod is disposed in the inner casing; and a shroud cover disposed outside the heating rod, the shroud side wall is provided with a plurality of water inlets, the shroud At least one water outlet is provided at the top.

In order to solve the above technical problem, the present invention also provides a method for heating an electric water heater, comprising the steps of: providing an electric water heater heating structure; inputting cold water into the inner tank through the water inlet pipe; and causing water in the inner tank to be The water inlets enter the shroud, and the water in the shroud is heated by the heating rod, and the water heated by the heating rod rises upward, flows out from the water outlet of the top of the shroud; The water pipe outputs the hot water that is heated in the inner tank.

The invention has at least the following advantages: The invention adopts the principle of the natural cold and heat convection circulation by the arrangement of the shroud, so that the water heated by the heating rod in the shroud is raised to the water outlet by the thermal buoyancy phenomenon, thereby forming a forced circulation. The uniform temperature of the bile water is better, and the heating effect can be improved to achieve the effect of quick heat and hot water discharge. At the same time, the use of cold water to impact the heating rod through the water inlet to lower the surface temperature of the heating rod can reduce scale generation.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

1‧‧‧ liner

11‧‧‧Assembled holes

2‧‧‧ water inlet

3‧‧‧Outlet pipe

4‧‧‧heating rod

5‧‧‧Shroud

51‧‧‧ Inlet

52‧‧‧Water outlet

6‧‧‧ cold water pipes

7‧‧‧ hot water pipe

H ₀ ‧‧‧ Heater top to bottom bottom distance

H ₂ ‧‧‧Distance from the top of the inlet to the bottom of the liner

H ₁ ‧‧‧The difference in height between the top of the outlet pipe and the top of the shroud

Φ ₀ ‧‧‧ liner diameter

Φ ₁ ‧‧‧heat rod diameter

Φ ₂ ‧‧‧ shroud diameter

1 is a schematic plan view showing a heating structure of an electric water heater of the present invention.

2 is a schematic view showing the use state of the heating structure of the electric water heater of the present invention.

3 is a flow chart of a method of heating an electric water heater of the present invention.

[First Embodiment]

Referring to FIG. 1 , the present invention provides a heating structure for an electric water heater, and more particularly to a heating structure of a heat storage water heater having a shroud device. The electric water heater heating structure includes a liner 1, an inlet pipe 2, and an outlet pipe. 3. At least one heating rod 4 and a shroud 5.

The inner tank 1 is a hollow container which can be a horizontal or upright cylinder. In the embodiment, the inner liner 1 is a transverse cylindrical body, and the inner tank 1 can accommodate water to be heated. The inner liner 1 can be made of a metal material or a non-metal material. The material, shape and structure of the inner liner 1 are not limited, and can be appropriately changed as needed.

The inlet pipe 2 and the outlet pipe 3 are disposed in the inner tank 1, and the bottom of the inlet pipe 2 and the outlet pipe 3 can be connected to the inner tank 1, and the bottom of the inlet pipe 2 and the outlet pipe 3 can be connected to the bottom or side wall of the inner tank 1 and the like. In the present embodiment, the inlet pipe 2 and the outlet pipe 3 are connected to the bottom of the tank 1, but the positions at which the inlet pipe 2 and the outlet pipe 3 are disposed are not limited, and may be appropriately changed as needed. Preferably, but not limited to, the inlet pipe 2 and the outlet pipe 3 are disposed in the inner casing 1 in an upright manner, that is, the inlet pipe 2 and the outlet pipe 3 can be vertically disposed in the inner casing 1, but the inlet pipe 2 and the outlet pipe are not excluded. 3 can also have a slight slope, or other shapes or structures.

Preferably, the top of the inlet pipe 2 is located near the bottom of the liner 1, and the top of the outlet pipe 3 is preferably located near the top of the liner 1, that is, the top of the outlet pipe 3 can be higher than the top of the shroud 5. The top of the shroud 5 can be higher than the top of the inlet pipe 2. In addition, the top of the outlet pipe 3 and the top of the liner 1 should be properly spaced so that the hot water can smoothly enter the outlet pipe 3. The bottom of the inlet pipe 2 can be connected to a cold water pipe 6, and the bottom of the outlet pipe 3 can be connected to a hot water pipe 7 for inputting cold water into the inner tank 1 via the cold water pipe 6 and the inlet water pipe 2, and via the water outlet pipe 3 and the hot water pipe 7 The hot water completed in the inner tank 1 is heated.

The heating rod 4 is disposed in the inner tank 1, and the heating rod 4 is a device such as an electric heating tube. The heating rod 4 can be bent into a U-shape or other shape. The number of the heating rods 4 is not limited, and one, two or several may be provided. If two or more heating rods 4 are provided, the heating rods 4 may be connected in parallel so that the heating rods 4 can be separated. Heating, the service life is increased.

The heating rod 4 is disposed at a position near the bottom of the inner tank 1, and the heating rod 4 can be fixed to the bottom of the inner tank 1. In the embodiment, the heating rod 4 is fixed to the bottom of the inner tank 1, and a bottom portion of the inner liner 1 can be opened. The hole 11 is assembled so that the heating rod 4 can be attached to the inner liner 1 via the assembly hole 11, and the heating rod 4 can be appropriately fixed to the inner liner 1 by screwing or the like. In addition, a suitable sealing member (not shown) may be provided between the heating rod 4 and the inner liner 1 to be sealed. The structure in which the heating rod 4 is fixed to the inner liner 1 and the seal is a conventional technique and will not be described again.

In addition, heat-dissipating fins (not shown) may be further added to the surface of the heating rod 4 to increase the heat transfer area to prevent the high temperature from being concentrated on the surface of the heating rod 4 without affecting the heat transfer efficiency. By reducing the surface temperature of the heating rod 4, the purpose of reducing scale generation is achieved, and the heating efficiency is improved.

The shroud 5 is preferably made of a metal material, and the shroud 5 is a hollow body. The shape of the shroud 5 is not limited. In the present embodiment, the shroud 5 forms a column that is always vertical (for example, The cylinder 5 is disposed outside the heating rod 4, and the bottom of the shroud 5 can be fixed to the inner tank 1. The shroud 5 can be spaced apart from the outside of the heating rod 4, and the shroud 5 and the heating rod 4 have different diameters so that a space can be formed therebetween. The shroud 5 can be located between the inlet pipe 2 and the outlet pipe 3, that is, the inlet pipe 2 can be located on the side of the shroud 5, and the outlet pipe 3 is located on the other side of the shroud 5.

The water inlet cover 51 is provided with a plurality of water inlets 51. The water inlets 51 may be circular or other shaped holes, and the shapes of the water inlets 51 are not limited. The water inlets 51 may be arranged neatly or in a staggered manner. The water inlets 51 are penetrated from the outer edge of the side wall of the airflow hood 5 to the inner edge, so that the inside and the outside of the airflow hood 5 are communicated, so that cold water can pass through. The water inlets 51 enter the inside of the shroud 5.

The water inlets 51 are preferably but not limited to being distributed in the lower half and intermediate positions of the side walls of the shroud 5, that is, the water inlets 51 may be distributed at a predetermined height of the side walls of the shroud 5, in the shroud 5 The water inlet 51 may not be provided at the upper half or near the top of the side wall. The top of the shroud 5 is provided with at least one water outlet 52. The water outlet 52 is preferably provided with one, that is, the top of the shroud 5 is designed to be open to form a water outlet 52. The diameter of the water outlet 52 can be equal to or The size and shape of the water outlet 52 are not limited, and may be provided as two or a plurality of water outlets 52. In the present embodiment, the shroud 5 is formed by bending and welding a metal plate, and the water outlet 52 is directly formed on the top of the shroud 5. The water outlet 52 is adjacent to the top of the water outlet pipe 3, that is, the top of the water outlet pipe 3 is located adjacent to the side of the water outlet 52.

Referring to FIG. 2, the cold water pipe 6 and the water inlet pipe 2 can be used to input cold water into the inner tank 1, so that the water in the inner tank 1 can enter the airflow guide 5 from the water inlet 51 of the air deflector 5, so as to utilize the heating rod 4. The water in the heating shroud 5 is heated, and the water heated by the heating rod 4 can force the hot water to rise by the thermal buoyancy phenomenon, and then flows out from the water outlet 52 at the top of the shroud 5, and the outlet pipe can be utilized at this time. 3 The hot water heated in the inner tank 1 is output, so that the outlet water pipe 3 can surely output the hot water, and then introduced into the surrounding cold water by the water inlet 51 of the shroud 5.

The invention can be further defined as follows:

H ₀ is the distance from the top of the heating rod 4 to the bottom of the liner 1.

H ₂ is the distance from the top of the water inlet 51 of the shroud 5 to the bottom of the inner tank 1.

H ₁ is the difference in height between the top of the outlet pipe 3 and the top of the shroud 5.

Φ ₀ is the diameter (inner diameter) of the liner 1.

Φ ₁ is the diameter (outer diameter) of the heating rod 4.

Φ ₂ is the diameter (inner diameter) of the shroud 5.

T ₂ is the water temperature of the water outlet 52 of the shroud 5 (the actual temperature during operation).

T _S is the hot water design temperature of the water outlet 52 of the shroud 5.

If the following two relationship conditions are met, the better hot water output and rapid heating effect can be achieved.

1. H ₀ ≦3Φ ₀ /4

2. H ₁ is 1 to 10 cm

If at least one of the following three relationship conditions is satisfied, better hot water output and rapid heating effect can be achieved.

1. H ₂ ≦H ₀ +10cm

2. T ₂ ≧T _S

3. Φ ₂ = Φ ₁ + (0.5 to 10 cm)

[Second embodiment]

Referring to FIG. 3, the present invention further provides a method for heating an electric water heater, comprising the following steps: First, step S110 is performed to provide an electric water heater heating structure, wherein the electric water heater heating structure comprises the inner tank 1, the water inlet pipe 2, and the water outlet pipe. 3. The heating rod 4, the shroud 5, and the like are not described again; then, in step S120, the cold water is input into the inner tank 1 by the water inlet pipe 2; then, the step S130 is performed to make the water in the inner tank 1 guide. The water inlet 51 of the flow hood 5 enters the flow guide 5, and the heating rod 4 heats the water in the flow guide 5, and the water heated by the heating rod 4 forces the hot water to rise by the thermal buoyancy phenomenon. The water outlet 52 at the top of the cover 5 flows out; finally, in step S140, the outlet pipe 3 outputs the hot water heated in the inner tank 1.

Therefore, the present invention utilizes the principle of natural cooling and convection circulation by the arrangement of the shroud 5, so that the water heated by the heating rod 4 in the shroud 5 rises up to the water outlet 52 by the thermal buoyancy phenomenon, thereby The forced circulation can be formed to make the uniform temperature of the whole bile water better, and the heating effect can be improved to achieve the effect of quick heat and hot water discharge. At the same time, the hot rod 4 is impacted by the cold water through the water inlet 51, so that the surface temperature of the heating rod 4 is lowered to reduce scale generation.

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the patent protection of the present invention. All changes are included in the scope of protection of the present invention and are combined with Chen Ming.

1‧‧‧ liner

11‧‧‧Assembled holes

2‧‧‧ water inlet

3‧‧‧Outlet pipe

4‧‧‧heating rod

5‧‧‧Shroud

51‧‧‧ Inlet

52‧‧‧Water outlet

6‧‧‧ cold water pipes

7‧‧‧ hot water pipe

H ₀ ‧‧‧ Heater top to bottom bottom distance

H ₂ ‧‧‧Distance from the top of the inlet to the bottom of the liner

H ₁ ‧‧‧The difference in height between the top of the outlet pipe and the top of the shroud

Φ ₀ ‧‧‧ liner diameter

Φ ₁ ‧‧‧heat rod diameter

Φ ₂ ‧‧‧ shroud diameter

Claims (9)

An electric water heater heating structure comprises: a liner; an inlet pipe, the inlet pipe is disposed in the liner; an outlet pipe, the outlet pipe is disposed in the liner; at least one heating rod, the at least one heating rod Provided in the inner casing; and a shroud cover, the shroud cover is disposed outside the heating rod, the shroud sidewall is provided with a plurality of water inlets, and the top of the shroud is provided with at least one water outlet; The distance from the top of the heating rod to the bottom of the tank is H ₀ , which satisfies the following relationship: H ₀ ≦ 3Φ ₀ /4, Φ _{0 is} the diameter of the tank, and the height difference between the top of the water outlet pipe and the top of the shroud is H ₁ , H ₁ is 1 to 10 cm. The electric water heater heating structure according to claim 1, wherein the inlet pipe and the outlet pipe are disposed upright, and the inlet pipe and the outlet pipe bottom are connected to the bottom of the liner. The electric water heater heating structure of claim 1, wherein the top of the water inlet pipe is located near the bottom of the inner tank, and the top of the water outlet pipe is located near the top of the inner tank. The electric water heater heating structure according to claim 1, wherein the shroud forms an upright column, and the shroud is located between the inlet pipe and the outlet pipe. The electric water heater heating structure of claim 1, wherein the water inlets are distributed in a lower half and an intermediate position of the side wall of the shroud. The electric water heater heating structure according to claim 1, wherein the distance from the top of the water inlet of the shroud to the bottom of the tank is H ₂ , which satisfies the following relationship: H ₂ ≦H ₀ +10 cm. The electric water heater heating structure according to claim 1, wherein the shroud has a diameter of Φ ₂ and satisfies the following relationship: Φ ₂ = Φ ₁ + (0.5 to 10 cm), and Φ _{1 is} the diameter of the heating rod. The electric water heater heating structure according to claim 1, wherein the water temperature of the water outlet of the shroud is T ₂ , which satisfies the following relationship: T ₂ ≧T _S , T _S is the water outlet design temperature of the water outlet of the shroud . A method for heating an electric water heater includes the following steps: An electric water heater heating structure according to any one of claims 1 to 8, wherein cold water is introduced into the inner tank through the inlet pipe; and water in the inner tank is introduced into the shroud from the water inlets. Heating the water in the shroud with the heating rod, the water heated by the heating rod rises upward, flows out from the water outlet of the top of the shroud; and outputs the heat of heating in the inner tank through the outlet pipe water.