WO2015096050A1

WO2015096050A1 - New solar water heater and heat collection method therefor

Info

Publication number: WO2015096050A1
Application number: PCT/CN2013/090395
Authority: WO
Inventors: 刘凯
Original assignee: 刘凯
Priority date: 2013-12-25
Filing date: 2013-12-25
Publication date: 2015-07-02

Abstract

A solar water heater and a heat collection method for the solar water heater. The water heater comprises a plurality of vacuum tubes (1). A tubular water tank (2) is inserted in each of the vacuum tubes (1). Lower ends of the tubular water tanks (2) are sealed, and upper ends are all connected on a connection tube (3). The part between outer surfaces of upper ends of the tubular water tanks (2) and inner walls of upper ends of the vacuum tubes (1) are sealed. A solar energy selective absorption layer is disposed on at least one of the vacuum tubes (1) and the tubular water tanks (2). Two ends of the connection tube (3) are a water inlet (31) and a water outlet (32) of the water heater respectively, and are used for being connected to indoor tap water. According to the water heater, a water storage tank is replaced by using tubular water tanks (2) inserted in the multiple vacuum tubes (1), so that the water heater occupies smaller space and has a simple structure; in addition, cold water is heated in a manner in which cold water flows through the upper end opening of each of the water tanks (2) and is heated by hot water at the upper end opening of the water tank (2), so that it can be ensured that the temperature of outflowing water are not changed overall.

Description

Novel solar water heater and heat collecting method thereof

The present invention relates to a solar heat collecting device, and in particular to a novel solar water heater and a heat collecting method thereof. Background technique

Solar water heaters convert water from low temperature to high temperature by converting solar energy into heat to meet the hot water use in life and production. Solar water heaters are an important way to effectively use clean renewable energy and have a broad space for development. Solar water heaters are divided into vacuum tube solar water heaters and flat panel solar water heaters according to their structure. Today, vacuum tube solar water heaters occupy a dominant position.

The existing vacuum tube solar water heater is mainly composed of a vacuum tube, a heat storage and heat preservation water tank and a bracket, and the water in the heat storage and heat preservation tank is heated by the vacuum tube collecting heat, and then sent to the indoor through the pipeline to meet the user's use. However, since the heat storage and heat preservation water tank usually has a large volume, it takes up a large installation space, and has a complicated structure and inconvenient installation.

In order to overcome the above disadvantages, there are two technical solutions in the prior art that do not provide a heat storage and heat insulating water tank.

1. An instant solar water heater disclosed in Chinese invention patent CN101140109A (application number: 200710156133. 8). In the solution, a plurality of solar heat collecting tubes are arranged on the component bracket, and an inner tube is disposed in each of the solar heat collecting tubes, and a gap is provided between the outer wall of the inner tube and the inner wall of the solar collecting tube, and the inner tube is disposed The port is the water inlet, and the water outlet is formed between the upper end of the inner flow tube and the inner wall of the solar heat collecting tube. The tap water enters the solar heat collecting tube from the water inlet of the inner flow tube for heating, and then flows into the next-stage solar heat collecting tube from the water outlet. , step-by-step flow heating to meet the needs of users using hot water. There is no heat storage tank in the scheme, and it can be used at any time. Use hot water. However, this scheme has the following disadvantages: (1) The realization structure of the step-by-step heating is more complicated; (2) Since the solar heat collecting tubes are mostly glass structures, the solar water heater of this structure cannot be operated under pressure; 3) In each solar collector tube, the hot water needs to be pushed out by the cold water entering through the inner tube, that is, the water needs to flow in the solar collector tube, so that the final outlet temperature is greatly affected by the current solar illuminance. , the phenomenon of uneven water temperature often occurs.

2. Chinese invention patent CN103335417A (Application No.: 201310294532. 6) discloses a non-storage hot water tank vacuum tube pressure water heater. In this solution, a heat exchange tube is inserted in each vacuum tube, and the heat exchange tube has a water inlet. And a water outlet (generally shaped like the U shape in the embodiment), a plurality of heat exchange tubes are connected in series to achieve stepwise heating. In this solution, the heat exchange tube can be made of a metal material, thereby solving the problem that the water heater cannot be operated under pressure, but the water still needs to flow in the vacuum tube, and therefore, there is also a problem that the outlet water temperature is not uniform. Summary of the invention

The technical problem to be solved by the present invention is to solve the problem that the existing vacuum tube type solar water heater has complicated structure and uneven water discharge temperature.

In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a novel solar water heater, comprising a plurality of vacuum tubes fixedly disposed outside, each of the vacuum tubes is respectively inserted with a tubular water tank, each of the tubular tubes The lower end of the water tank is closed, and the upper end protrudes from the vacuum tube and is respectively connected to the connecting tube, and the outer surface of the upper end of the tubular water tank is sealed with the inner wall of the upper end of the vacuum tube, and at least two of the vacuum tube and the tubular water tank are One of the connecting tubes is provided with a solar selective absorbing coating; the two ends of the connecting tube are respectively a water inlet and a water outlet of the new solar water heater, and are used for connecting a water pipe provided in the room.

In the above water heater, a switch port is provided on the water pipe between the water inlet and the water outlet.

In the above water heater, an outer surface of the connecting pipe and a water pipe and the connecting pipe The outer surface of the joint between the water inlet and the water outlet is covered with an insulating layer.

In the above water heater, a phase change heat storage heat conducting layer is interposed between an inner wall of the vacuum tube and an outer wall of the tubular water tank.

In the above water heater, the plurality of vacuum tubes are arranged in a row.

In the above water heater, the plurality of vacuum tubes are arranged in a plurality of rows, arranged in an array, and the connecting tubes of each row are connected end to end in sequence.

In the above water heater, the vacuum tube is vertically disposed.

The present invention also provides a heat collecting method for a solar water heater, comprising the steps of: heating a tubular water tank inserted therein in real time by using each vacuum tube to concentrate hot water at an upper port thereof; each of the tubular water tanks The lower end is closed, the upper end protrudes from the upper end of the vacuum tube and is respectively connected to the connecting tube, and the outer surface of the upper end of the tubular water tank is sealed with the inner wall of the upper end of the vacuum tube;

The tap water enters from the water inlet of the connecting pipe, flows through the upper port of each tubular water tank in turn, and is heated step by step by the hot water at the upper port of the corresponding tubular water tank, and finally the hot water flows out from the water outlet of the connecting pipe.

In the above method, the plurality of vacuum tubes are arranged in a row.

In the above method, the plurality of vacuum tubes are arranged in a plurality of rows, arranged in an array, and the connecting tubes of each row are sequentially connected end to end.

The invention replaces the insulated water storage tank of the solar water heater by the tubular water tank respectively inserted in the plurality of vacuum tubes, has a simple structure and greatly reduces the occupied space; in addition, the tap water enters through the water inlet of the connecting pipe, and sequentially flows through each The upper port of a tubular water tank is heated step by step by the hot water at the upper port of the corresponding tubular water tank, and finally the hot water flows out from the water outlet of the connecting pipe. Since the water in each tubular water tank is heated and does not flow away, only the hot water at the upper port is used for heat exchange, so that the temperature of the water in the tubular water tank in each vacuum tube is substantially constant, thereby ensuring the final The temperature of the hot water flowing out is basically the same. DRAWINGS

Figure 1 is a schematic view of the structure of the present invention. detailed description

The invention will be described in detail below with reference to the drawings and specific embodiments.

As shown in Fig. 1, the novel solar water heater provided by the present invention comprises a plurality of vacuum tubes fixedly arranged outside, and the number of vacuum tubes 1 is usually set according to the environment and actual needs. A tubular water tank 2 is inserted into each of the vacuum tubes 1 respectively. The tubular water tank 2 has a straight tubular shape with a lower end closed and an open upper end. The upper end of each tubular water tank 2 passes through the upper end of the vacuum tube 1 and is respectively connected to a connecting pipe 3 to form a parallel structure, and the tubular water tank 2 The upper outer surface is sealed between the outer surface of the upper end of the vacuum tube 1. In the present embodiment, the tubular water tank 2 is made of a stainless steel plate.

After the tubular water tank 2 is inserted into the vacuum tube 1, the outer surface is adjacent to the inner wall of the vacuum tube 1, and at least one of the vacuum tube 1 and the tubular water tank 2 is provided with a solar selective absorbing coating to absorb solar energy and convert it into thermal energy. Heating of the water in the tubular water tank 2. If the solar tube 1 and the tubular water tank 2 are provided with a solar selective absorbing coating, the utilization of solar energy can be further increased.

The two ends of the connecting pipe 3 are respectively a water inlet 31 and a water outlet 32 of the new solar water heater for connecting the water pipe 4 installed in the room, and the water pipe 3 between the water inlet 31 and the water outlet 32 is provided with a switch 闽5. Select or not use the solar water heater through switch 闽5. The switch 闽 5 can be either manually controlled or electrically controlled (controlled according to user commands or automatically controlled based on the water detection temperature).

Wherein, the closing switch 闽5 is equivalent to selecting to turn on the solar water heater mode. At this time, if the hot water faucet in the room is opened, the tap water enters from the water inlet 31 of the connecting pipe 3, and sequentially flows through the upper port of each tubular water tank 2. , step by step is heated by the hot water at the upper port of the corresponding tubular water tank 2, and finally the hot water flows out from the water outlet 32 of the connecting pipe 3 to reach the hot water tap; opening the switch 闽5 is equivalent to selecting the solar water heater mode to be disconnected. When tap water is directly in the water pipe 4 Flowing in, no longer entering the connecting pipe 3, equivalent to no longer using solar water heaters.

In addition, the water heater is provided with an inspection port 7 at the water inlet of the solar water heater for shutting off the water in the new solar water heater by shutting down the inspection when the new solar water heater fails.

In view of the above solar water heater, the present invention also provides a heat collecting method for a solar water heater, comprising the following steps:

A tubular water tank is inserted into each vacuum tube, and each of the vacuum tubes is used to heat the tubular water tank inserted therein in real time, and the cold and hot water in the tubular water tank are convected up and down, so that the hot water is collected at the upper port of the tubular water tank;

The tap water enters from the water inlet of the connecting pipe, flows through the upper port of each tubular water tank in turn, and is heated step by step at the upper port of each tubular water tank by the hot water at the upper port of the corresponding tubular water tank, and finally by the connecting pipe The outlet water flows out of the hot water.

The technical solution provided by the present invention is equivalent to dividing the heat storage and heat insulation water tank into a plurality of independent tubular water tanks and directly inserting them into the vacuum tube. Therefore, the present invention solves many of the prior art as compared with the prior art solutions. Unsolvable puzzles with the following outstanding advantages:

(1) According to the present invention, the heat storage and heat preservation water tank is not separately provided, and the volume is reduced, which solves the problem that the occupied space in the prior art is large (the installation position cannot be found on the roof when many users use it), and the installation is inconvenient. .

(2) The water in the tubular water tank does not flow at all, and the vacuum tube always heats it. Therefore, the water temperature at the port on the tubular water tank is kept at the highest temperature; at the same time, the vacuum tube is equivalent to a relatively good heat preservation container, so that The temperature of the water in the tubular water tank is also basically constant, even within a day, the sunlight illuminance varies greatly.

(3) The tap water is heated by the hot water at the port on the tubular water tank in each vacuum tube. Since only a small part of the heat exchange is performed at a time, the water temperature at the port on the tubular water tank is not greatly affected. Quickly return to the original temperature (highest temperature). In this way, it is basically ensured that the same heat is obtained when water flows through the upper port of each tubular water tank, thereby ensuring that the temperature of the finally flowing hot water is kept uniform. (4) The tubular water tank is made of metal such as stainless steel plate. Therefore, the solar water heater provided by the present invention can be operated under pressure.

(5) In the present invention, the vacuum tubes are arranged in a row, or may be arranged in a plurality of rows to form an array, and the connecting tubes of each row are sequentially connected end to end to form a tandem structure, and the above structure may be vertically installed on the wall of the corresponding user. On the side, it is therefore possible to reduce the connection between the solar water heater and the water pipe.

In the present invention, the outer surface of the connecting pipe 3 and the outer surface of the connection between the water pipe and the water inlet and the water outlet of the connecting pipe are wrapped with a heat insulating layer to avoid heat loss when the heated hot water flows through the pipe, thereby improving The heating efficiency of the water heater.

Further, a heat conductive protective material layer is provided between the inner wall of the vacuum tube 1 and the outer wall of the tubular water tank 2, on the one hand, the heat loss when the tubular water tank 2 is heated can be reduced, and at the same time, the heat generation efficiency can be greatly improved. In addition, since the tubular water tank is made of metal and the vacuum tube is made of glass, the thermal conductive protective layer can also protect the tubular water tank from thermal expansion and contraction, thereby avoiding accidents caused by thermal expansion and contraction between the tubular water tank and the vacuum tube. . The present invention is not limited to the above-described preferred embodiments, and any one skilled in the art should be aware of the structural changes made in the light of the present invention. Any technical solutions having the same or similar to the present invention fall within the protection scope of the present invention.

Claims

claims

1. A new type of solar water heater, including a number of vacuum tubes fixedly installed outdoors. It is characterized in that a tubular water tank is inserted into each vacuum tube. The lower end of each tubular water tank is closed, and the upper end extends out of the vacuum tube. and then respectively connected to the connecting pipes, and the outer surface of the upper end of the tubular water tank is sealed with the inner wall of the upper end of the vacuum tube. At least one of the vacuum tube and the tubular water tank is provided with a solar energy selective absorption coating. layer; The two ends of the connecting pipe are respectively the water inlet and the water outlet of the new solar water heater, and are used to connect the automatic water heater installed indoors.

2. The new solar water heater according to claim 1, characterized in that a switch is provided on the water pipe located between the water inlet and the water outlet.

3. The new solar water heater according to claim 1, characterized in that the outer surface of the connecting pipe and the outer surface of the connection between the water pipe and the water inlet and outlet of the connecting pipe are wrapped with an insulation layer.

4. The new solar water heater according to claim 1, characterized in that a thermal conductive protective layer is sandwiched between the inner wall of the vacuum tube and the outer wall of the tubular water tank.

5. The new solar water heater according to claim 1, characterized in that the plurality of vacuum tubes are arranged in a row.

6. The new solar water heater according to claim 1, characterized in that the plurality of vacuum tubes are arranged in multiple rows in an array, and the connecting tubes in each row are connected end to end in sequence.

7. The new solar water heater according to any one of claims 1 to 6, characterized in that the vacuum tube is arranged vertically.

8. The heat collection method of solar water heater is characterized by including the following steps:

Each vacuum tube is used to heat the tubular water tank inserted in it in real time, so that hot water gathers at its upper port; the lower end of each tubular water tank is closed, and the upper end extends out of the upper end of the vacuum tube and is connected to the connecting pipe respectively. And there is a seal between the outer surface of the upper end of the tubular water tank and the inner wall of the upper end of the vacuum tube; Tap water enters from the water inlet of the connecting pipe, flows through the upper port of each tubular water tank in turn, and is gradually heated by the hot water at the upper port of the corresponding tubular water tank. Finally, the hot water flows out from the water outlet of the connecting pipe.

9. The new solar water heater according to claim 8, characterized in that the plurality of vacuum tubes are arranged in a row.

10. The new solar water heater according to claim 8, characterized in that the plurality of vacuum tubes are arranged in multiple rows in an array, and the connecting tubes in each row are connected end to end in sequence.