WO2012019552A1

WO2012019552A1 - Heat exchange tube apparatus inside solar thermal collector tube

Info

Publication number: WO2012019552A1
Application number: PCT/CN2011/078287
Authority: WO
Inventors: 王克涛
Original assignee: Wang Ketao
Priority date: 2010-08-11
Filing date: 2011-08-11
Publication date: 2012-02-16
Also published as: CN102374678A

Abstract

A metal heat exchange tube apparatus (1) inside solar thermal collector tube, comprises: a shaped tube head (6) and a heat exchange tube body with one end blocked off (2). The heat exchange tube body (2) is a corrosion resistant thin wall metal tube; the shaped tube head (6) is a corrosion resistant metal part with a convex retaining ring (4) provided thereon; a sealed straight neck tube (3) below the convex retaining ring (4); a short straight neck tube (5) is provided above the convex retaining ring (4) or is formed by inverting inward the lower closed straight neck tube (3); the heat exchange tube body (2) is connected with the shaped tube head (6) at the short straight neck tube (5) by welding or soft sealing, thus avoiding problems of weld penetration and weld leakage due to the thinness of the tube in tube-to-tube welding and tube-in-tube welding.

Description

Metal heat exchange tube device in solar collector tube

Technical field

The invention belongs to the field of solar water heating devices, and is particularly a metal heat exchange tube device in a solar heat collecting tube used for a solar water heating device.

Background technique

At present, the solar water heating device technology generally uses a glass vacuum heat collecting tube to absorb sunlight to raise the temperature of the water in the tube. The disadvantage is that the tube contains a lot of water, and the temperature rises slowly. The heat collecting tube is made of glass material, and the water is hot and cold or the heavy object hits and the like is easily broken. To this end, some leak-proof heat exchange tubes in solar water heating systems have emerged. However, these technologies still have some defects, for example: As shown in Fig. 12, in the Chinese utility model patent (patent number: 200320109508.2), when the water tank 32 is full or pressurized, the water jacket 31 and the working medium tube 30 are sealed from each other. The ring 1134 and the sealing ring I 33 are subjected to a force drop, and the force is applied to the glass vacuum heat collecting tube. The vacuum collecting tube is fragile, fragile and unsafe. As shown in FIG. 13, the water tank of the solar water heating device is a pressurized water tank 20, and the heat transfer tube sleeve 21 is disposed in the pressurized water tank 20, and the working heat exchange tube 24 is inserted into the vacuum heat collecting tube 23, and the working medium heat exchange is performed. The working heat exchange tube head 22 of the tube 24 is inserted into the heat exchange tube sleeve 21. The heat absorbing film on the vacuum heat collecting tube 23 absorbs sunlight, so that the working medium in the working medium heat exchange tube 24 is heated and heated to generate density or phase. Variable reaction, upward flow, the temperature is transferred to the heat exchange tube head of the working medium heat exchange tube, the working heat exchange tube head 22 transmits the temperature to the heat exchange tube sleeve 21, and the high temperature heat exchange tube sleeve 21 is in the water tank The water is heated and heated to complete the solar water heating process. The heat exchange form is the secondary indirect heat transfer of the working medium in the working medium tube, and the heat energy loss is large. When used in an environment with a large content of calcium and magnesium ions in the tap water, the heat exchange tube sleeve is easy to scale, which greatly reduces the heat exchange efficiency. The water tank and the working medium heat exchange tube are generally made of copper, so the manufacturing process of the solar water heating device is complicated and the cost is extremely high.

As shown in FIG. 9, a heat exchange tube technology is disclosed in the Chinese invention patent application (Application No. 200810011160.0). Although the above problems are solved, as shown in FIG. 10, the heat exchange tube head and the heat exchange tube body are It is a method of butt welding (ring welding H) of the pipe head to the pipe head. Or, as shown in FIG. 11, the heat exchange tube head and the heat exchange tube body adopt the method of intubation welding (loop welding position H) of the tube head to the tube wall, and the heat exchange tube head and the heat exchange tube body The material is generally made of thin-walled stainless steel tube. When selecting a thin-walled stainless steel thin-walled tube (the thickness of the wall is less than 0.8mm), it is easy to weld and leak; it can not properly implement various welding protection processes (such as argon). Protection process), the occurrence of carbon deposition is likely to occur in the weld, and the corrosion resistance of the heat exchange tube is poor. When selecting a stainless steel thin wall tube with a thick wall thickness (the wall thickness is greater than or equal to 0.8 mm), the batch welding process is complicated, manufacturing and materials. high cost.

Summary of the invention

The object of the present invention is to provide a novel metal heat exchange tube device for use in a vacuum heat collecting tube on a solar water heating device, which solves the problems of high manufacturing cost and complicated process in the prior art. The technical solution of the present invention is:

The utility model relates to a metal heat exchange tube device in a solar heat collecting tube, which comprises a special-shaped tube head and a sealed heat exchange tube body, the heat exchange tube body is a corrosion-resistant metal thin-wall tube, and the special-shaped tube head is a corrosion-resistant metal integral part. The shaped tube head of the device is provided with a reinforcing convex ring, a sealed straight neck tube is arranged under the fastening convex ring, and a straight neck short tube is arranged on the fastening convex ring; or, the tube is turned inside the sealed straight neck tube , forming a straight neck short tube, and a heat exchange tube body at the straight neck short tube.

The metal heat exchange tube device in the solar heat collecting tube, the connection of the shaped tube head to the heat exchange tube body at the straight neck short tube can be connected by welding or soft sealing.

The metal heat exchange tube device in the solar heat collecting tube, the shaped tube head of the device is welded and connected to the heat exchange tube body, and the open end of the heat exchange tube body is inserted in the straight neck short tube and inserted into the tube of the heat exchange tube body The head plane is flat with the tube head plane of the straight neck short tube and welded at the tube head plane of the two tubes.

The metal heat exchange tube device in the solar heat collecting tube, the shaped tube head of the device is connected with the heat exchange tube body by a soft seal, and a sealing ring is arranged between the straight neck short tube of the shaped tube head and the heat exchange tube body a flared nozzle is arranged at the open end of the heat exchange tube body, and the heat exchange tube body is inserted into the sealing ring at the short neck of the straight neck from the sealing end, and is inserted into the flared nozzle position, on the heat exchange tube body The flared nozzle is stuck at the straight neck.

The advantages and benefits of the present invention are:

1. The present invention designs a specific portion connected to the heat exchange tube body on the shaped tube head (generally a stainless steel thin-walled tensile member) thereon: a straight neck short tube, and the outer diameter of the heat exchange tube body is only slightly smaller than The inner diameter of the straight neck short tube, when the heat exchange tube body is inserted into the straight neck short tube, when the tube head plane of the heat exchange tube body is flat with the tube head plane of the straight neck short tube, the straight neck short tube is a section, etc. The inner diameter of the corrosion-resistant metal thin-walled tube, so the wall of a section of the heat exchange tube (usually optional stainless steel thin-walled tube) inserted into the straight neck short tube is closely attached to the inner tube wall of the straight neck short tube, and the two tubes There is almost no gap between them. The welding is carried out at the plane of the tube heads of the two tubes. Since the tube heads of the two tubes are welded together, a reasonable welding process is completed in the batch welding to solve the manufacturing cost of the prior art. High, complicated process and easy to weld through the pipe wall, welding leakage, carbonized rust and water leakage.

2. The method for connecting and connecting the metal heat exchange tube device in the solar heat collecting tube of the present invention with the water tank of the solar water heating device: inserting the shaped tube head through the water tank connection port into the water tank, and sealing the sealing rubber ring on the heat exchange tube body, Push to the water tank connection, and then pull the metal heat exchange tube device outward. The inner diameter of the sealing rubber ring is slightly smaller than the outer diameter of the sealed straight neck tube. When the sealed straight neck tube is installed at the water tank connection port When sealing the rubber ring, the sealing rubber ring is tightly sealed on the outside of the sealed straight neck tube, so that the metal heat exchange tube device heats the solar energy at the water tank connection port through the sealed straight neck tube, the heat exchange tube body and the sealing rubber ring. The inner cavity of the water device water tank and the metal heat exchange tube device is sealed from the outside to prevent water from entering the glass vacuum heat collecting tube; in addition, since the size of the water tank connection port is only slightly larger than the outer diameter of the reinforcing convex ring on the shaped tube head (Generally it can be larger than 0.05mm~lmm), the thickness of the sealing rubber ring installed at the connection port of the water tank reduces the diameter of the water tank connection port. Inch, when the lower end of the locking collar is connected to the sealing straight pipe, the lower convex surface of the reinforcing convex ring is stuck on the upper ring of the sealing rubber ring at the water tank connection port, solar water heating The water tank of the device is pressurized or pressurized, and the metal heat exchange tube device cannot be subjected to pressure drop. The vacuum heat collecting tube is sleeved outside the metal heat exchange tube connected to the water tank of the solar water heating device, and the heat absorbing film on the vacuum heat collecting tube absorbs. The sunlight can heat the water in the metal heat exchange tube and the natural gravity heat exchange with the low temperature water in the water tank of the solar water heating device to complete the solar water heating process; the device makes the solar energy system with simple process and low cost. The hot water installation achieves safe operation under full water and pressure, and provides necessary safety conditions for the full promotion of solar water heating equipment.

3. The metal heat exchange tube and the solar water heating device water tank of the invention can realize the disassembly and transportation of the parts and the on-site assembly due to the above-mentioned connection form and installation method, which is beneficial to comprehensive promotion.

4. According to the invention, since the water in the metal heat exchange tube is much smaller than the water in the vacuum heat collecting tube, the heating speed is fast, the circulating speed of the hot and cold water is also increased, and the heating speed is increased; The water is exchanged in the metal heat exchange tube, and will not cause the glass vacuum collector tube to be broken; in addition, when the vacuum tube is broken due to the impact of the heavy object on the vacuum tube, since there is no water in the vacuum heat collecting tube, no water leakage will occur.

5. The invention adopts a vacuum heat collecting tube to absorb solar energy, so that the water in the metal heat exchange tube is heated and the low temperature water in the water tank of the solar water heating device is subjected to natural gravity heat exchange, thereby avoiding the use of the working medium heat exchange tube. The heat loss in the heat exchange process caused by the indirect heat transfer of the working medium is large, the heat exchange efficiency is low, and the manufacturing cost is high.

DRAWINGS

1 is a schematic structural view of a metal heat exchange tube device of the present invention;

Figure 2 is a cross-sectional view of the shaped tube head of Figure 1;

Figure 3 is a schematic view showing the structure of the metal heat exchange tube device of the present invention;

Figure 4 is a cross-sectional view of the shaped tube head of Figure 3;

Figure 1-4, 1 - metal heat exchange tube device; 2 - heat exchange tube body; 3 sealed straight neck tube; ^ carding convex ring; 5 - straight neck short tube; 6 - shaped tube head; H-ring welding At the office.

Figure 5 is a schematic cross-sectional view showing the connection of the metal heat exchange tube device and the water tank of the solar water heating device;

Figure 6 is a schematic view of the sealing rubber ring of Figure 5;

Figure 5, Figure 6, 1 metal heat exchange tube device; 2 - heat exchange tube body; 3 sealed straight neck tube; ^ carding convex ring; 5 - straight neck short tube; 6 - shaped tube head; 9 vacuum set Heat pipe; 1 (^ water tank connection port; 11 a solar water heating device water tank; ₁₂ _3⁄4 sealing rubber ring; A - the state when the sealing rubber ring is placed on the heat exchange tube body; B - the water tank connection port after installing the sealing rubber ring metal The state when the heat exchange tube is pulled outward; the state of the vacuum heat collecting tube, the sealing rubber ring, and the metal heat exchange tube of the C_ solar water heating device is completed. 7 is a schematic structural view of a metal heat exchange tube device connected with a heat seal tube in a soft seal form according to the present invention; FIG. 8 is a metal heat exchange tube in a soft seal form connected with a heat exchanger tube body according to the present invention; Figure 2 - Figure 8, 1 - metal heat exchange tube device; 2 - heat exchange tube body; 3 ~ 3⁄4 sealed straight neck tube; ^ carding convex ring; 5 - straight neck short tube; - shaped tube head; 7 - flared nozzle; 8 - sealing ring;

Figure 9 is a schematic view showing the structure of a patented leak-proof heat exchange tube;

Figure 10 is a schematic view of a structure (tube butt welding) for welding the pipe head of the patented water leakage heat exchange tube and the heat exchange tube body;

Figure 11 is a schematic view of the structure (intubation welding) of the welded pipe head of the patented leak-proof heat exchange tube and the heat exchange tube body;

Figure 12 is a schematic view showing the installation of the heat exchange tube of the non-pressure-bearing solar water heating device;

30~ working tube; 31-water jacket; 32-water tank; 33-seal ring I; 3 ~ seal ring II.

Figure 13 is a schematic view showing the installation of the working medium heat exchange tube of the pressurized solar water heating device;

2 ₀ _pressure water tank; ₂₁ _ heat exchange tube sleeve; ₂₂ _ working heat exchange tube head; ₂₃ _ vacuum heat collecting tube; 2^ working medium heat exchange tube. detailed description

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the metal heat exchange tube device 1 of the present invention is provided with a special-shaped tube head 6; and a heat-exchange tube body 2 sealed at one end (--optional stainless steel thin-wall tube) The special-shaped tube head 6 can be made of a corrosion-resistant metal integral part (generally optional stainless steel material) made by a metal drawing process, and a fixing convex ring 4 is arranged on the shaped tube head 6, and the reinforcing convex ring 4 is provided below Seal the straight neck tube 3. In the present invention, as shown in FIG. 1 and FIG. 2, a straight neck short tube 5 is provided on the upper surface of the reinforcing collar 4; or, as shown in FIG. 3 and FIG. 4, the tube is turned inward under the sealed straight neck tube 3, A straight neck short tube 5 is formed; as shown in Figs. 1 and 3, a heat exchange tube body 2 is connected to the straight neck short tube 5.

As shown in Fig. 1 and Fig. 3, the deformed tube head 6 and the heat exchange tube body 2 are welded, and the open end of the heat exchange tube body 2 is inserted into the straight neck short tube 5, and inserted into the tube head of the heat exchange tube body 2. The plane is flat with the flat surface of the straight neck 5, and is welded at the tube head plane of the two tubes, where H is the position of a ring weld. Because the outer diameter of the heat exchange tube body 2 is smaller than the inner diameter of the straight neck short tube 5, the straight neck short tube 5 is a thin metal tube of an inner diameter such as a length (this length can be set to 5-8 mm), so it is inserted into the straight neck short. The tube wall of the heat exchange tube body 2 in the tube 5 (this length is about 5-8 mm) is closely attached to the inner tube wall of the straight neck short tube 5, and there is almost no gap between the two tubes, such as welding two For the façade head, the welding thickness is the length of the two sleeves that are close together (about 5-8mm). A reasonable welding process can be completed during batch welding. The following problems are solved: The tube head adopts the tube-to-tube welding method and the tube-intubation welding method. The welding thickness is only the thickness of the stainless steel thin-walled tube itself. If the tube wall is thin (the thickness is 0.4-0.8mm), the penetration and solder leakage problems are easy to occur. Batch welding; if the wall thickness is increased (greater than or equal to 0.8mm), the material cost is high, and the promotion is restricted. As shown in FIG. 7 and FIG. 8, the special-shaped tube head 6 is connected with the heat-exchange tube body 2 through a straight neck short tube 5 in a soft seal form, and a sealing ring 8 is arranged between the straight neck short tube 5 and the heat exchange tube body 2. a flared nozzle 7 is provided at the open end of the heat exchange tube body 2. The connection method of the shaped tube head 6 and the heat exchange tube body 2 is that the heat exchange tube body 2 is inserted into the shaped tube head 6 from the blocking end and the neck is short. Inside the sealing ring 8 at the tube 5, it is inserted into the position of the flared nozzle 7. The diameter of the flared nozzle 7 on the heat exchange tube body 2 is larger than the diameter of the straight neck short tube 5. When the heat exchange tube body 2 is inserted into the flared nozzle port 7, it is caught at the straight neck short tube 5.

As shown in FIG. 1, FIG. 3, FIG. 5 and FIG. 6, the connection method of the metal heat exchange tube device 1 of the present invention and the solar water heating device water tank 11 is: inserting the shaped tube head 6 through the water tank connection port 10 into the solar energy In the water tank 11 of the hot water supply device, the sealing rubber ring 12 is placed on the heat exchange tube body 2, pushed to the water tank connection port 10, and the stainless steel heat exchange tube device 1 is pulled outward to seal the inner diameter of the rubber ring 12. Less than the outer diameter of the sealed straight neck tube 3, when the sealing straight neck tube 3 passes through the sealing rubber ring 12 installed at the water tank connection port 10, the sealing rubber ring 12 is tightly sealed outside the sealing straight neck tube 3; 1, 3, and 5, the metal heat exchange tube device 1 passes the sealed straight neck tube 3, the heat exchange tube body 2, and the sealing rubber ring 12 at the water tank connection port 10, and the solar water heating device water tank 11 and The inner cavity of the metal heat exchange tube device 1 is sealed from the outside, so that water cannot enter the glass vacuum heat collecting tube 9; or, as shown in Fig. 5, Fig. 7, and Fig. 8, the metal heat exchange tube device 1 passes through the sealed straight neck tube 3, heat exchange tube body 2, sealing rubber ring 12 at the water tank connection port 10 The inner cavity of the solar water heating device water tank 11 and the metal heat exchange tube device 1 is sealed from the outside by the sealing ring 8 between the straight neck short tube 5 and the heat exchange tube body 2, so that the water cannot enter the glass vacuum. Collecting heat pipe 9;

As shown in FIG. 1 , FIG. 3 , FIG. 5 , FIG. 7 and FIG. 8 , the diameter of the water tank connection port 10 is only slightly larger than the outer diameter of the reinforcing collar 4 on the shaped tube head 6 (generally greater than 0.05 mm to 1 mm). The thickness of the sealing rubber ring 12 installed at the water tank connection port 10 reduces the diameter of the water tank connection port 10, and pulls the lower end of the fixing convex ring 4 and the sealed straight neck tube 3 to the water tank connection port. 10, the lower convex surface of the reinforcing convex ring 4 is stuck on the upper end ring of the sealing rubber ring 12 at the water tank connecting port 10, the water tank 11 of the solar water heating device is filled with water or pressurized, the metal heat exchange tube device 1 and the heat exchange Tube 2 cannot be subjected to pressure drop;

As shown in Fig. 5, the vacuum heat collecting tube 9 is placed outside the metal heat exchange tube device 1 connected to the solar water heating device water tank 11, and the heat absorbing film on the vacuum heat collecting tube 9 absorbs sunlight to change the metal therein. The water temperature in the heat pipe device 1 is subjected to natural gravity heat exchange with the low temperature water in the water tank 11 of the solar water heating device to complete the solar water heating process; the device makes the solar water heating device full in a simple process and low cost. The safe operation of water or under pressure provides the necessary safety conditions for the full promotion of solar water heating equipment.

The metal integral part of the shaped tube head and the straight neck short tube on the special-shaped tube head of the device of the invention can make the connection mode of the tube head of the metal heat exchange tube device and the heat exchange tube body complete the mature and reasonable connection process, The invention has the problems of high production cost, complicated process and easy penetration of the pipe wall, welding leakage, carbonized rust and water leakage.

Claims

Rights request

1. A metal heat exchange tube device in a solar collector tube, characterized in that: the device comprises a shaped tube head (6) and a closed heat exchange tube body (2), and the heat exchange tube body (2) is corrosion resistant The metal thin-walled tube, the special-shaped tube head (6) is a corrosion-resistant metal part, and the shaped tube head (6) of the device is provided with a reinforcing convex ring (4), and the fixing convex ring (4) is provided with a sealed straight neck. Tube (3), the convex collar (4) is provided with a straight neck short tube (5); or, under the sealed straight neck tube (3), the tube is turned inside the tube to form a straight neck short tube (5), in a straight A heat exchange tube body (2) is connected to the neck short tube (5).

2. The metal heat exchange tube device in a solar heat collecting tube according to claim 1, wherein: the special-shaped tube head (6) is welded to the heat exchange tube body (2) at the straight neck short tube (5). Or a soft seal connection.

3. The metal heat exchange tube device in a solar heat collecting tube according to claim 2, wherein: the shaped tube head (6) of the device is welded to the heat exchange tube body (2), and the heat exchange tube body (2) The open end of the tube is inserted into the straight neck short tube (5), inserted into the flat surface of the tube head of the heat exchange tube body (2) and the flat surface of the straight neck short tube (5), in the tube head of the two tubes Welding is carried out at the plane.

4. The metal heat exchange tube device in a solar heat collecting tube according to claim 2, wherein: the shaped tube head (6) of the device and the heat exchange tube body (2) are connected by a soft seal, and the shaped tube head is 6) a sealing ring (8) is arranged between the straight neck short tube (5) and the heat exchange tube body (2), and a flared nozzle (7) is arranged at the open end of the heat exchange tube body (2). The heat exchange tube body (2) is inserted into the sealing ring (8) at the straight neck short tube (5) from the blocking end, inserted into the flared nozzle (7) position, and the horn on the heat exchange tube body (2) The shaped nozzle (7) is caught at the straight neck short tube (5).