CN201497238U - Heat collecting tube and solar heat collector and solar water heater consisting of same - Google Patents

Abstract

The utility model provides a heat collecting tube which can bear pressure and has lower price than the prior hot pipe heat collecting tube and U-shaped pipe heat collecting tube, and a solar heat collector and a solar water heater which use the heat collecting tube. The heat collecting tube comprises a glass vacuum tube, and a metal heat transfer device extending into the inner tube of the glass vacuum tube; the metal heat transfer tube is provided with a front cavity and a rear cavity; and the front cavity and the rear cavity are communicated at the bottom. The glass vacuum tube absorbs solar energy and converts the same into heat energy; the heat energy is transferred to the water in the front and the rear cavities by the metal heat transfer device through the inner wall of the glass vacuum tube; the water in the front cavity is heated, floats and then enters the liner of a water tank connected with the front cavity; cold water enters the rear cavity from the liner of the water tank, and enters the front cavity from the bottom; and media form natural convectional chimney effect in the front and the rear cavities, so that the efficiency of natural convection is greatly improved.

Description

Heat collecting tube and solar heat collector and solar water heater made of it

technical field

The utility model relates to a heat collecting tube, a solar heat collector and a solar water heater formed by the heat collecting tube.

Background technique

The existing vacuum heat collecting tubes mainly include all-glass vacuum heat collecting tubes, which are installed in-line. The advantage is that the cost is low, and the disadvantage is that they are not under pressure; Sheung Shui is easy to explode the tube; it leaks when damaged. The heat collector tubes that can withstand pressure mainly include heat pipe heat collector tubes and U-shaped tube heat collector tubes. The advantage is pressure-bearing, but the disadvantage is that the cost is high. There is a gap, and the heat transfer resistance is large.

Utility model content

The purpose of the utility model is to provide a heat collecting tube capable of bearing pressure and lower in price than heat pipe heat collecting tubes and U-shaped tube heat collecting tubes.

The heat collecting tube includes a glass vacuum tube and a metal heat conductor, and the metal heat conductor extends into the inner tube of the glass vacuum tube; the metal heat conductor has two cavities, front and rear, and the front and rear cavities communicate at the bottom.

Its working principle is: because the metal heat conductor has two chambers, the front and the back, and the two chambers communicate at the bottom. When the vacuum tube is placed obliquely, the front chamber faces the sun and the rear chamber faces downward. When the vacuum tube is placed flat, the front cavity is upward and the rear cavity is downward. This structure is very conducive to the natural convection of water (or medium). Specifically, the glass vacuum tube absorbs solar energy and converts it into heat energy, and the heat energy is transmitted to the metal heat conductor through the inner wall of the glass vacuum tube inner tube, and then transmitted by the metal heat conductor to the water or other media in the front and rear chambers of the glass vacuum tube, so that the metal heat conductor The water or other medium in the cavity floats up after being heated and enters the medium storage part connected to it (such as the inner tank of the water tank), the cold water or other medium enters the back cavity from the medium storage component, and then enters the front cavity from the bottom, and the medium is formed in the front and rear cavity The chimney effect of natural convection greatly improves the efficiency of natural convection.

The beneficial effect of the heat collecting pipe:

1. The water or other medium in the metal heat conductor is naturally convected in the front and rear chambers, forming a chimney effect, which greatly improves the efficiency of natural convection;

2. The medium in the metal heat conductor can withstand pressure;

3. There is no medium in the glass vacuum tube and no scaling;

4. Long service life;

5. Even if the glass vacuum tube is filled with water at high temperature, the glass vacuum tube will not explode;

6. There is no water leakage in the glass vacuum tube, and no water leakage after the glass vacuum tube is damaged.

As a further improvement to the above-mentioned heat collecting tube, the outer wall of the metal heat conductor is provided with fins, and the metal heat conductor and the fins are integrated; the fins are in contact with the inner wall of the inner tube. The inner wall of the glass vacuum tube transfers heat to the metal heat conductor through the fins, and the existence of the fins increases the heat conduction efficiency.

As a further improvement to the above-mentioned heat collecting tube, aluminum is used for the metal heat conductor, because aluminum is cheap and easy to form.

As a further improvement to the above-mentioned heat collecting tube, a partition plate extending axially along the glass vacuum tube to separate the front and rear chambers is arranged in the metal heat conductor.

The utility model also provides a solar heat collector using the above-mentioned heat-collecting tubes, which includes a plurality of the above-mentioned heat-collecting tubes, and the metal heat conductors in each heat-collecting tube are connected to a header in parallel, and the front and rear chambers of the metal heat-conductors are connected The headers are connected. When the solar heat collector is used on a solar water heater, the two ends of the collecting pipe communicate with the water tank of the solar water heater respectively. The water in the metal heat conductor circulates with the water in the water tank of the solar water heater through the manifold, thereby heating the water in the water tank. The water circulation in the solar heat collector and the water tank can be a natural circulation or a forced circulation. Because the solar heat collector can withstand pressure and has a beautiful appearance, it is suitable to be a solar water heater that is perfectly combined with buildings such as a balcony type, a wall-mounted type, and a sloping roof type.

As a further improvement to the above-mentioned solar heat collector, the metal heat conductor in each heat collecting tube is in a detachable sealed connection (such as threaded connection) with the collecting tube. This allows the metal heat spreader to be detached from the header for easy cleaning of the metal tubes as well as packaging and shipping.

As a further improvement to the above solar heat collector, it also includes a header with a thermal insulation layer inside, and the manifold passes through the thermal insulation layer in the header.

The utility model also provides a solar water heater using the above-mentioned solar heat collecting tube, which includes a water tank and a plurality of above-mentioned heat collecting tubes, and the metal heat conductors in each heat collecting tube are connected to the water tank liner in parallel. The inner tanks of the water tanks are connected. When the glass vacuum tube absorbs solar energy and turns it into heat energy, the heat energy is transmitted to water or other media through the metal heat conductor, so that the water in the front chamber is heated and then floats into the inner tank, and the cold water enters the back cavity from the inner tank, and then enters the front cavity from the bottom, forming The chimney effect of natural convection greatly improves the efficiency of natural convection, thereby heating the water in the water tank.

As a further improvement to the above-mentioned solar water heater, the metal heat conductor in each heat collecting tube forms a detachable sealing connection (such as threaded connection) with the inner tank of the water tank.

Description of drawings

Figure 1 is a schematic diagram of a solar collector tube.

Fig. 2 is an enlarged cross-sectional view of the heat collecting tube in Fig. 1 .

Figure 3 is a schematic diagram of a solar thermal collector.

Fig. 4 is a schematic diagram of a solar water heater.

Detailed ways

Embodiment 1: heat collecting tube

Referring to the heat collecting tube 10 in Figures 1 and 2, the metal heat conductor 4 is placed in the inner tube of the glass vacuum tube 1, and the metal heat conductor 4 is provided with a partition 11 extending axially along the glass vacuum tube. The two sides of the partition are respectively connected with the inner wall of the metal heat conductor to separate the inner cavity of the metal heat conductor from the front chamber 2 and the rear chamber 5. The gap 12, the front cavity 2 and the rear cavity 5 communicate through the gap 12. The outer circumference of the metal heat conductor 4 has fins 3, and the metal heat conductor 4 and the fins 3 are integrated. The fins 3 are in contact with the inner tube of the glass vacuum tube 1 .

Example 2: Solar Thermal Collector

Referring to the solar heat collector in FIG. 3 , it includes a plurality of heat collecting tubes 10 described in Embodiment 1, and the metal heat conductor 4 in each heat collecting tube 10 is threaded and connected to the side wall of the collecting tube 6 . The front cavity 2 of the metal heat conductor is at the upper part, and the rear cavity 5 is at the lower part, both of which communicate with the manifold. An insulating layer 7 is arranged inside the header 8 and the header 6 passes through the insulating layer 7 in the header 8 . Water inlet pipes (not shown) and water outlet pipes (not shown) are respectively connected to both ends of the header.

Embodiment 3: Solar Water Heater

Referring to the solar water heater in Fig. 4, it includes a plurality of heat collecting tubes 10 and a water tank described in Embodiment 1, and the metal heat conductor 4 in each heat collecting tube is connected to the water tank liner 9 in parallel, and the metal heat conductor and the water tank liner can be formed. Disassemble sealed connections (eg threaded connections). The front cavity 2 of the metal heat conductor 4 is at the top, and the rear cavity 5 is at the bottom, and both communicate with the water tank liner.

When the glass vacuum tube absorbs solar energy and turns it into heat energy, the heat energy is transmitted to the water in the inner cavity of the metal heat conductor through the fins 3 and the metal heat conductor 4, so that the water in the front chamber 2 of the metal heat conductor is heated and floats into the water tank liner 9, Cold water enters the back chamber 5 of the metal heat conductor from the water tank liner 9, and then enters the front chamber from the bottom of the metal heat conductor, forming a chimney effect of natural convection, greatly improving the efficiency of natural convection, thereby heating the water in the water tank.

Claims (9)

1. thermal-collecting tube comprises glass-vacuum tube and extend into metal heat-conducting device in the interior pipe in glass-vacuum tube that it is characterized in that: two chambeies before and after the metal heat-conducting device has, the chamber, front and back communicates in the bottom.

2. thermal-collecting tube according to claim 1 is characterized in that: metal heat-conducting device outer wall has fin, and metal heat-conducting device and fin are an integral body; Fin contacts with inner tube wall.

3. thermal-collecting tube according to claim 1 and 2 is characterized in that: the metal heat-conducting device is the metal heat-conducting device of aluminium material.

4. thermal-collecting tube according to claim 1 and 2 is characterized in that: be provided with in the metal heat-conducting device along the axially extended dividing plate that is used to separate the chamber, front and back of glass-vacuum tube.

5. solar thermal collector, it is characterized in that: it comprises the described thermal-collecting tube of a plurality of claims 1, and the metal heat-conducting device in each thermal-collecting tube also is connected on the collector, and the chamber, front and back of metal heat-conducting device all communicates with collector.

6. solar thermal collector according to claim 5 is characterized in that: the metal heat-conducting device in each thermal-collecting tube becomes removable seal to be connected with collector.

7. solar thermal collector according to claim 5 it is characterized in that: further comprising the header that inside is provided with heat-insulation layer, and collector passes the heat-insulation layer in the header.

8. solar water heater, it is characterized in that: it comprises water tank and the described thermal-collecting tube of a plurality of claim 1, and the metal heat-conducting device in each thermal-collecting tube also is connected on the inner water tank, and the chamber, front and back of metal heat-conducting device all communicates with inner water tank.

9. solar water heater according to claim 8 is characterized in that: the metal heat-conducting device in each thermal-collecting tube becomes removable seal to be connected with inner water tank.

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