WO2024021989A1

WO2024021989A1 - Water heater with cavity gap

Info

Publication number: WO2024021989A1
Application number: PCT/CN2023/103791
Authority: WO
Inventors: 刘舞
Original assignee: 刘舞
Priority date: 2022-07-26
Filing date: 2023-06-29
Publication date: 2024-02-01
Also published as: CN115235125A

Abstract

Disclosed in the present invention is a water heater with a cavity gap, the water heater comprising: a heat absorption member; a heat preservation barrel, which is used for storing water; a cavity gap, which is configured to separate the heat absorption member from the heat preservation barrel, wherein between the heat absorption member and the heat preservation barrel, the cavity gap comes into contact with a heat transfer portion of the heat preservation barrel; a heat preservation and transfer groove, which comprises the arrangement of the cavity gap, wherein a part of the heat absorption member extends into the heat preservation and transfer groove; and a heat transfer member, which is arranged in the heat preservation and transfer groove and transfers heat of the heat absorption member to the cavity gap. By using the cavity gap to isolate the heat absorption member and the heat preservation barrel, the heat preservation effect at night is improved, and the heat preservation performance requirement for the heat absorption member is low; and the performance requirement for the material of the heat absorption member is low, such that the manufacturing cost is relatively low.

Description

Water heater with cavity gap

Technical field

The present invention relates to the technical field of solar thermal utilization, and in particular to a water heater with a cavity gap.

Background technique

Solar water heaters are increasingly being used widely. The insulation barrels and heat-absorbing parts of existing solar water heaters are in direct contact with each other (water is connected). Solar radiation shines on the surface of the inner tube through the appearance of the heat-absorbing member. After the outer surface of the inner tube coated with the absorbing coating absorbs the solar radiation, it transfers heat to the water inside the vacuum tube. After the water is heated, it is heated along the vacuum tube and rises into the storage. At the same time, the relatively low-temperature water in the water tank enters the vacuum tube. This continuous cycle causes the water in the hot water storage tank to be continuously heated. However, these solar heat-absorbing parts radiate heat at night, losing heat in vain. Especially for heat absorbing parts with poor vacuum insulation performance, more heat is lost.

For this reason, we provide water heaters with cavity gaps to solve the above problems.

Contents of the invention

The purpose of the present invention is to propose a water heater with a cavity gap in view of the shortcomings of the existing technology. The cavity gap is used to isolate the heat-absorbing part and the heat-insulating barrel. On the one hand, the heat-insulating effect is strong at night, and the heat-insulating performance of the heat-absorbing part is required. Low; on the other hand, the performance requirements for the heat-absorbing material are low and the production cost is low. At the same time, the cavity gap is filled using the principle of material expansion, so that the space gap can be filled with heat transfer liquid according to the temperature, and has strong adaptability.

In order to achieve the above object, the present invention adopts a water heater with a cavity gap, including:

heat absorbing parts;

Insulated barrels for storing water;

A cavity gap is configured to separate the heat-absorbing member and the insulating barrel between the heat-absorbing member and the insulating barrel, and the cavity gap is in contact with the heat transfer part of the insulating barrel;

Thermal insulation heat transfer tank is arranged close to the cavity gap, and the part of the above-mentioned heat absorbing member goes deep into the thermal insulation heat transfer tank;

The heat transfer member is placed in the thermal insulation heat transfer tank and transfers the heat of the heat absorber to the cavity gap.

The cavity gap is used to isolate the heat-absorbing parts and the heat-insulating barrel. On the one hand, the heat-insulating effect is strong at night and the requirements for the heat-insulating performance of the heat-absorbing parts are low. On the other hand, the performance requirements for the heat-absorbing parts are low and the production cost is low.

As a further optimization of the above solution, an expansion device contacts the heat-absorbing member and absorbs the heat of the heat-absorbing member. The inner cavity of the expansion device is provided with a medium and heat transfer liquid that expands as the temperature rises. The heat transfer liquid is close to The outlet of the expansion device is in communication with the cavity gap;

in,

After the medium is heated, it squeezes the heat transfer liquid through the outlet and fills the cavity gap;

After the medium is cooled, the heat transfer liquid is sucked back from the cavity gap to the expansion device to reduce the liquid level of the heat transfer liquid in the cavity gap. The above expansion device is placed in the thermal insulation heat transfer tank. The expansion device appears as an expansion bag, which is filled with The heat transfer element uses the principle of material expansion to fill the expanding working fluid, so that the space gap can be filled with heat transfer liquid according to the temperature, and has strong adaptability.

As a further optimization of the above solution, the heat transfer liquid is placed between the medium and the outlet of the expansion device. In this structure, the medium squeezes the heat transfer liquid after being heated, and enters the insulation heat transfer tank through the opening of the insulation heat transfer tank. Then, the heat transfer liquid fills the cavity gap to achieve indirect heating of the thermal insulation barrel.

As a further optimization of the above solution, the above-mentioned expansion device is placed in the thermal insulation heat transfer tank, the outlet is located at the end of the expansion device, and the medium is placed at the top of the expansion device. As an example of the above-mentioned expansion device, after the expansion device of this example is heated, the medium squeezes the heat transfer liquid from the opening into the thermal insulation heat transfer tank, and fills the cavity gap through the thermal insulation heat transfer tank to achieve the above thermal insulation. Indirect heating of the barrel.

As a further optimization of the above solution, the above-mentioned thermal insulation and heat transfer tank is placed in the expansion device. The bottom of the above-mentioned thermal insulation and heat transfer tank is connected with the expansion device. The upper part of the inner cavity of the expansion device is the medium and the lower part is the heat transfer liquid. The above-mentioned thermal insulation heat transfer tank is elongated and straight as another example of the above-mentioned expansion device. In this structure, after being heated, the medium squeezes the heat transfer liquid downward and enters the thermal insulation heat transfer tank through the bottom opening of the thermal insulation heat transfer tank. , and then, the heat transfer liquid fills the cavity gap to achieve indirect heating of the thermal insulation barrel.

As a further optimization of the above solution, a first blocking structure is placed at the outlet of the above-mentioned cavity gap to reduce radiation and convection losses.

As a further optimization of the above solution, the cavity gaps are filled with grid-shaped poor heat conductors. The design of the grid-shaped poor heat conductors can further enhance the isolation and heat preservation effect of the present invention.

As a further optimization of the above solution, the above-mentioned cavity gap is in a zigzag shape. The design of the zigzag cavity gap mentioned above can further enhance the isolation and heat preservation effect of the present invention.

As a further optimization of the above solution, the above-mentioned thermal insulation barrel is provided with at least one redundant cavity near the cavity gap side, and the redundant cavity is connected with the cavity gap. The design of the above-mentioned multiple redundant cavities accommodates the excess discharged heat transfer liquid in the expansion device and reduces the internal pressure.

As a further optimization of the above solution, a water heater with a cavity gap as any one of the above is included, so that the present invention can be applied to various water heaters to expand the practical scope of use of the present invention.

The water heater with cavity gap of the present invention has the following beneficial effects:

1. Abandoning the many defects caused by the direct connection between the traditional heat absorbing parts and the insulation barrel, and adopting a more advanced indirect heating process, the cold water is converted from direct heating by the heat absorbing parts to indirect heating through the heat transfer liquid. By designing a cavity gap between the thermal insulation barrel and the heat-absorbing component, on the one hand, the thermal insulation effect is strong at night, requiring low thermal insulation performance requirements for the heat-absorbing component material, and reducing costs; on the other hand, the thermal insulation barrel has a strong thermal insulation effect. More importantly, the above-mentioned expansion device uses the principle of material expansion to fill the cavity gap to fill the cavity gap under high temperature conditions and achieve indirect heating; under low temperature conditions, the liquid level in the cavity gap is reduced to achieve cavity insulation. Purpose.

2. Further discuss the structure of the above-mentioned expansion device. In one of the solutions, the above-mentioned expansion device adopts a long straight shell with an opening downward. After being heated, the medium squeezes the heat transfer liquid from the opening into the thermal insulation heat transfer tank. And fill the cavity gap through the thermal insulation heat transfer tank to achieve indirect heating of the above-mentioned thermal insulation barrel; in another solution, the thermal insulation heat transfer tank is placed in the above-mentioned expansion device, and in this solution the thermal insulation heat transfer tank is open at the bottom Long straight structure. In this structure, after being heated, the medium squeezes the heat transfer liquid downward and enters the heat transfer tank through the bottom opening of the insulation heat transfer tank. Then, the heat transfer liquid fills the cavity gap to achieve the above Indirect heating of insulated barrels.

3. In fact, there are many design structures for the isolation and insulation of the above-mentioned cavity gaps. The present invention uses the first blocking structure blocking the outlet of the above-mentioned cavity gap as the basic structure. The following improvements can be made: filling the cavity gap with grid-like poor conductors of heat, designing the cavity gap into a zigzag shape, and designing the cavity gap into a zigzag shape. The redundant cavity is filled with a second blocking structure in the redundant cavity based on the design of the redundant cavity; according to the above modification, at least four cavity gaps with isolation and heat preservation functions can be formed, and the above-mentioned multiple redundant cavities The cavity is designed to accommodate excess discharge of heat transfer fluid from the expansion device, reducing internal pressure.

With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail and the manner in which the principles of the present invention may be adopted is indicated. It should be understood that the scope of the embodiments of the present invention is not thereby limited. Embodiments of the present invention include many alterations, modifications and equivalents within the spirit and scope of the appended claims.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a water heater with a cavity gap;

Figure 2 is a schematic structural diagram of the first expression form of the expansion device in the present invention;

Figure 3 is a schematic structural diagram of the second expression form of the expansion device in the present invention;

Figure 4 is a schematic structural diagram of a bad conductor in the present invention;

Figure 5 is a schematic structural diagram of the bent cavity gap in the present invention;

Figure 6 is a schematic structural diagram of the redundant cavity in the present invention;

Figure 7 is a schematic structural diagram of the first blocking structure in the present invention.

In the picture: 1. Insulation barrel; 2. Heat absorber; 3. Cavity gap; 4. Insulation heat transfer tank; 5. Expansion device; 6. First blocking structure; 31. Poor conductor; 32. Redundant cavity ; 33. Second blocking structure; 51. Medium; 52. Heat transfer liquid; 53. Shell.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through the drawings and examples. However, it should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the scope of the present invention.

It should be noted that when an element is said to be "disposed on, provided with" another element, it can be directly on the other element or there may also be intervening elements. When one element is said to be "connected to, connected to" another element A component, which can be directly connected to another component or there may be an intermediate component at the same time. "Fixed connection" means fixed connection. There are many ways of fixed connection, which are not within the scope of this article. The terms used in this article “Vertical”, “horizontal”, “left”, “right” and similar expressions are for illustrative purposes only and do not represent the only implementation manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to the present invention. The terms used in the specification are only for the purpose of describing specific embodiments and not For the purpose of limiting the invention, the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items;

In the existing water heater, the heat-insulating barrel 1 and the heat-absorbing member 2 of the water heater are in direct contact, that is, a water-connected structure, such as a solar water heater. In this structure, the heat-absorbing member 2 that absorbs solar energy radiates heat at night, and the heat is lost in vain. Therefore, , it is necessary to consider the vacuum insulation performance of the heat-absorbing member 2, so that the heat-absorbing member 2 in this structure has higher material requirements.

In view of the above situation, the present invention provides a water heater with a cavity gap. The water heater includes an insulating barrel 1 and a solar heat absorbing member 2. The present invention provides a cavity gap 3 between the insulating barrel 1 and the heat absorbing member 2. An insulation heat transfer tank 4 is provided near the cavity gap 3. The insulation heat transfer tank 4 receives the heat transferred by the heat absorbing member 2, and then transfers heat to the cavity gap 3 through the heat transfer member in the insulation heat transfer tank 4, and then transfers the heat. to the water in the thermos bucket 1.

The preferred embodiment of the water heater with cavity gap is further discussed in conjunction with Figure 1:

Figure 1 shows the overall structure of an example water heater with a cavity gap, such as a solar water heater with a cavity gap.

In this example, the following structure is included:

Insulation barrel 1, used to store liquid to be heated;

The heat absorbing member 2 is used to absorb heat. In this example, the heat absorbing member 2 is a solar heat absorbing member. Of course, it can also be a flat plate heat absorbing structure;

The cavity gap 3 is configured to separate the heat-absorbing element 2 and the insulating barrel 1 between the heat-absorbing element 2 and the insulating barrel 1. The cavity gap 3 is in contact with the heat transfer part of the insulating barrel 1. ;

Insulation and heat transfer tank 4. One of the purposes of this insulation and heat transfer tank 4 is to connect the heat absorbing element 2 and the insulation barrel 1, so that the heat absorption element 2 and the insulation barrel 1 form an integral structure through the insulation and heat transfer tank 4; this insulation Another purpose of the heat transfer tank 4 is to conduct heat to the cavity gap 3. Specifically, after the temperature in the thermal insulation heat transfer tank 4 reaches a certain temperature, heat transfer elements are used to fill the cavity gap 3 with heat.

The heat transfer member is placed in the thermal insulation heat transfer tank 4 and transfers the heat of the heat absorber 2 to the cavity gap 3.

This demonstration has the following advantages:

1) The night heat dissipation of the above-mentioned heat absorbing member 2 is cut off, and the heat preservation effect of the heat preservation barrel 1 is better.

2) The heat absorbing member 2 does not directly contact the water and can prevent the vacuum tube from bursting.

3) The heat absorber 2 can be filled with antifreeze to adapt to the colder north.

4) The heat-absorbing part 2 does not directly contact the water, and a wider range of materials can be considered. There is no need to worry about contaminating the used water, and the cost can be lower.

5) There is less scale contamination in the heat absorbing part 2.

6) The water in the insulation barrel 1 is separated from the heat absorbing part 2 to reduce pollution.

7) The water in the thermal insulation barrel 1 does not need to be in direct contact with the heat absorbing member 2, and can be adapted to areas with poor water quality.

Figure 1 is a schematic representation for illustrative purposes only and does not limit the disclosed examples.

Additionally, there are various types of water heaters, many of which may benefit from the examples disclosed herein without being limited to the designs shown.

In the example, the above insulation and heat transfer device can realize the insulation and heat transfer function through electrical control. However, when using electrical control, the reliability will be damaged or reduced, and the cost of use will also increase accordingly, such as electricity bills and reliability of parts damage.

To this end, using the principle of thermal expansion of matter, the present invention selects the expansion device 5 as the heat transfer element based on the above-mentioned example structure:

Expansion device 5, which contacts the heat-absorbing member 2 and absorbs the heat of the heat-absorbing member 2. The above-mentioned expansion device 5 The inner cavity is provided with a medium 51 that expands as the temperature rises and a heat transfer liquid 52. The heat transfer liquid 52 is close to the outlet of the expansion device 5 and the outlet is connected to the cavity gap 3;

in,

After being heated, the medium 51 squeezes the heat transfer liquid 52 through the outlet and fills the cavity gap 3;

After the medium 51 is cooled, the heat transfer liquid 52 is sucked back from the cavity gap 3 to the expansion device 5 to lower the liquid level of the heat transfer liquid 52 in the cavity gap 3 .

The above expansion device will be further discussed below in conjunction with Figures 2 and 3:

Figure 2 is an expression of the above-mentioned expansion device 5. The expansion device 5 is provided inside the thermal insulation heat transfer tank 4. The expansion device 5 includes a long straight shell 53, and a sealing and limiting structure is provided at the outlet. The outlet is disposed At the bottom of the shell 53, the medium 51 is placed on the top of the shell 53, and the heat transfer liquid 52 is placed between the medium 51 and the outlet. After being heated, the medium 51 squeezes the heat transfer liquid 52 from the outlet into the thermal insulation heat transfer tank. 4 and fill the cavity gap 3 through the thermal insulation heat transfer tank 4 to achieve indirect heating of the above-mentioned thermal insulation barrel 1.

Generally speaking, the expansion device 5 is mostly selected as a piston-type structure with one end closed to facilitate understanding of the function of the expansion device 5, and the expansion device 5 can be positioned in any direction. Preferably, the shell 53 can be made of tubular metal, and the movable parts Less, higher reliability.

For the opening of tubular metal, the outlet can be located on the side, top, etc. of the tubular metal object. When the outlet is located on the side, it can be connected to the thermal insulation heat transfer tank 4 by connecting a hollow tube. However, considering that during use of the traditional piston structure, the piston frequently reciprocates, the probability of damage is increased, and the reliability and lifespan are reduced. Therefore, the outlet of the tubular metal object is generally located below.

Furthermore, the above-mentioned tubular metal object can be made of other materials. Preferably, the above-mentioned tubular metal object is made of a sealing material, such as a sealed silicone container, a rubber container, etc.

Figure 3 is another representation of the above-mentioned expansion device 5. The above-mentioned thermal insulation and heat transfer tank 4 is placed in the expansion device 5. The above-mentioned thermal insulation and heat transfer tank 4 is elongated and straight, and the bottom is connected to the expansion device 5. The expansion device 5 There is medium 51 above the inner cavity and heat transfer liquid 52 below. In this structure, the medium 51 squeezes the heat transfer liquid 52 downward after being heated, and enters the heat transfer tank 4 through the bottom opening of the insulation heat transfer tank 4, and then Finally, the heat transfer liquid 52 fills the cavity gap 3 to achieve indirect heating of the thermal insulation barrel 1 .

In this expression, the location of the expansion device 5 should be conducive to fully sensing the temperature change of the heat transfer liquid. For example, the above-mentioned expansion device 5 is arranged in the heat absorber 2 .

The above-mentioned expansion device 5 has the following further embodiments:

Low-cost solution: use a sealed silica gel bag (tube) filled with a small amount of ethanol as the expansion device 5 and built into the thermal insulation heat transfer tank 4. (Guaranteed durability of sealed silicone bags)

Furthermore, the heat transfer liquid 52 is generally water. Of course, other liquid substances may also be selected, such as salt solution, antifreeze liquid, etc.

The above-mentioned medium 51 generally uses naphtha that is insoluble in the heat transfer liquid 52. The density of the above-mentioned naphtha is smaller than that of water, and the boiling point of the naphtha is between 40-105°C. Of course, the naphtha can also be replaced by gas, such as Air or other liquids with boiling points between 40-100℃, such as ethanol, etc.

Furthermore, blocking measures can be designed at the lower part of the above-mentioned expansion device 5 to prevent excessive expansion of gas.

When actually working:

During the day, the heat absorber 2 absorbs heat. After the heat transfer liquid 52 heats up and the temperature is higher than 40 degrees Celsius, the naphtha in the expansion device 5 vaporizes and expands, and the heat transfer liquid 52 is discharged, filling the cavity gap 3, and the high temperature transfer liquid 52 is When the water level of the hot liquid 52 rises, the water in the thermal insulation barrel 1 can be heated.

At night, when the water cools down and the temperature of the heat transfer liquid 52 drops below 40 degrees Celsius, the naphtha liquefies, the volume shrinks, the water level in the cavity gap 3 decreases, and the cavity gap 3 is emptied, entering the heat preservation state.

Figures 2 and 3 are schematic illustrations for illustrative purposes only and do not limit the disclosed examples.

Additionally, there are various types of heat exchange devices, many of which may benefit from the examples disclosed herein without being limited to the designs shown.

In the example, the insulation barrel 1 is generally installed with a structural device that is beneficial to heat transfer. Generally speaking, the cavity gap 3 is usually structurally improved. Therefore, the present invention is based on the structure of the above example. Cavity gap 3 is further improved.

In fact, the present invention uses the first blocking structure 6 blocking the outlet of the cavity gap 3 as the basic structure.

The above-mentioned improved cavity gap 3 will be further elaborated below with reference to Figures 4 to 7:

Figure 4 is a first improvement scheme of the above-mentioned cavity gap 3. In this improvement scheme, the cavity gap 3 is filled with a grid-shaped thermal poor conductor 31. For example, the grid-shaped thermal poor conductor 31 is a sponge. Its water-permeable and air-impermeable properties reduce heat dissipation.

Figure 5 shows a second improvement plan for the above-mentioned cavity gap. In this improvement plan, the cavity gap 3 is designed into a zigzag structure to reduce radiation heat dissipation.

Figure 6 is a third improvement plan for the above-mentioned cavity gaps. In this improvement plan, the number of cavity gaps 3 is designed to be multiple, and two adjacent cavity gaps 3 are connected to each other, and the multiple cavity gaps 3 are connected to each other. Designed as a cavity gap body and Redundant cavity 32 to achieve isolation and heat preservation function.

Figure 6 shows the fourth improvement scheme of the above-mentioned cavity gap 3. This improvement scheme is improved on the basis of the third improvement scheme and further strengthens the present invention by installing a second blocking structure 33 in the redundant cavity 32. isolation and heat preservation function.

For example, the above-mentioned first blocking structure 6 and the second blocking structure 33 can be designed to be larger than the width of the outlet of the cavity gap 3 and have a density smaller than the valve stem of water. At the same time, the valve stem can be attached with an insulation material.

For example, as shown in FIG. 7 , the lower surface of the above-mentioned first blocking structure 6 is provided in a convex shape, and the convex portion serves as a guide, which can better realize the blocking function of the first blocking structure 6 .

They are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. .

Claims

A water heater with a cavity gap is characterized by including:

heat absorbing parts;

Insulated barrels for storing water;

A cavity gap is configured to separate the heat-absorbing member and the insulating barrel between the heat-absorbing member and the insulating barrel, and the cavity gap is in contact with the heat transfer part of the insulating barrel;

The thermal insulation heat transfer tank is arranged close to the cavity gap, and the heat transfer liquid in the above-mentioned heat absorbing member is connected to the thermal insulation heat transfer tank;

The heat transfer member is placed in the thermal insulation heat transfer tank and transfers the heat of the heat absorber to the cavity gap.
The water heater with cavity gap according to claim 1, characterized in that:

The above-mentioned heat transfer element includes an expansion device, which contacts the heat-absorbing element. The inner cavity of the above-mentioned expansion device is provided with a medium and heat transfer liquid that expands as the temperature rises. The above-mentioned heat transfer liquid is close to the outlet of the expansion device and the outlet Connected to the cavity gap;

in,

After the medium is heated, it squeezes the heat transfer liquid through the outlet and fills the cavity gap;

After the medium is cooled, the heat transfer liquid is sucked back from the cavity gap to the expansion device to reduce the liquid level of the heat transfer liquid in the cavity gap. The above expansion device is placed in the thermal insulation heat transfer tank. The expansion device appears as an expansion bag, which is filled with Expanding working medium.
The water heater with a cavity gap according to claim 2, characterized in that the heat transfer liquid is placed between the medium and the outlet of the expansion device.
The water heater with a cavity gap according to claim 3, characterized in that the expansion device is placed in the thermal insulation heat transfer tank, the outlet is located at the end of the expansion device, and the medium is placed at the top of the expansion device.
The water heater with a cavity gap according to claim 3, characterized in that: the above-mentioned thermal insulation and heat transfer tank is placed in an expansion device, the bottom of the above-mentioned thermal insulation and heat transfer tank is connected with the expansion device, and the upper part of the inner cavity of the expansion device is medium and the lower part is It is a heat transfer liquid.
The water heater with a cavity gap according to any one of claims 1 to 4, characterized in that the first blocking structure is placed at the outlet of the cavity gap.
The water heater with cavity gaps according to claim 6, characterized in that the cavity gaps are filled with grid-like poor conductors of heat.
The water heater with a cavity gap according to claim 6, wherein the cavity gap is in the shape of Zigzag shape.
The water heater with a cavity gap according to claim 6, wherein the insulation barrel is provided with at least one redundant cavity near the cavity gap, and the redundant cavity is connected with the cavity gap.
A heat exchange device, characterized by: including a water heater with a cavity gap as claimed in any one of claims 1-9.