CN211575569U

CN211575569U - Double-heat-absorbing-pipe composite parabolic light-focusing heat collector

Info

Publication number: CN211575569U
Application number: CN202020087010.4U
Authority: CN
Inventors: 江希年
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-09-25
Anticipated expiration: 2030-01-15

Abstract

A double-heat-absorption-pipe composite parabolic light-gathering heat collector comprises vacuum heat-collecting pipes arranged above a composite parabolic light collector, wherein the composite parabolic light collector consists of two half bodies which are bilaterally symmetrical, and involute ends of the two half bodies are mutually connected to form a whole with a omega-shaped cross section. The utility model has the advantages that: by optimizing the design of the compound parabolic condenser, two low-cost all-glass vacuum heat collecting tubes are arranged in a reflecting groove of one compound parabolic condenser, the condensing ratio is improved to 1.2-1.5, the heat efficiency is improved, and the cost is reduced. And secondly, the vacuum heat collecting pipe and the header are divided into two heat conducting medium channels to form a heat conducting medium circulation loop, and a reinforced convection heat exchange mechanism between the inner wall of the glass pipe and the working medium is formed under the driving of a circulating pump, so that the heat efficiency is improved.

Description

Double-heat-absorbing-pipe composite parabolic light-focusing heat collector

Technical Field

The utility model relates to a non-tracking spotlight heat collector specifically is a compound parabolic spotlight heat collector of double heat absorption pipe, belongs to the spotlight solar collector field of solar thermal energy utilization.

Background

The prior art discloses a solar heat collector (with the publication number of CN201983472U) with a compound parabolic condenser, the structure of which is shown in figure 10, and the solar heat collector comprises a vacuum heat collecting tube 3, wherein the vacuum heat collecting tube 3 is arranged at the center above the compound parabolic condenser 2, the compound parabolic heat collector which adopts a full glass vacuum tube as a heat absorbing body of the vacuum heat collecting tube 3 has the advantages that the light condensing ratio which is usually designed at the position of the vacuum heat collecting tube 3 is lower, the water in the vacuum heat collecting tube 3 is in a static sunning state, and the heat transfer efficiency is low.

Disclosure of Invention

The utility model provides a double heat-absorbing pipe composite paraboloid light-focusing heat collector, which improves the heat transfer efficiency and reduces the cost.

The technical scheme of the utility model is that: a double-heat-absorption-pipe composite parabolic light-gathering heat collector comprises a vacuum heat-collecting pipe arranged above a composite parabolic light collector, wherein the composite parabolic light collector consists of two half bodies which are bilaterally symmetrical, each half body consists of an involute and a parabola which are connected in a smooth mode, and one ends of the involutes of the two half bodies are connected with each other to form a whole with a omega section.

The utility model has the advantages that: firstly, through the design of the double-heat-collecting-tube compound parabolic condenser, two low-cost all-glass vacuum heat-collecting tubes are arranged in a reflecting groove of one compound parabolic condenser, the light-gathering ratio is improved to 1.2-1.5, the heat efficiency is improved, and the cost is reduced. And secondly, the vacuum heat collecting pipe and the header are divided into two heat conducting medium channels to form a heat conducting medium circulation loop, and a reinforced convection heat exchange mechanism between the inner wall of the glass pipe and the working medium is formed under the driving of a circulating pump, so that the heat efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of a prior art configuration;

FIG. 2 is a schematic cross-sectional structure diagram of the single-unit xcpc light-focusing heat collector of the present invention;

FIG. 3 is a cross-sectional view D-D of FIG. 2;

FIG. 4 is a schematic diagram of the structure of the east-west module comprised of the xcpc concentrator collectors of the present invention;

FIG. 5 is a cross-sectional view E-E of FIG. 4;

FIG. 6 is a cross-sectional view A-A of FIG. 4;

FIG. 7 is a cross-sectional view B-B of FIG. 6;

FIG. 8 is a cross-sectional view C-C of FIG. 7;

FIG. 9 is a schematic structural view of a north-south module comprising the xcpc concentrating collectors of the present invention; fig. 10 is a left side view of fig. 9.

Description of reference numerals: 1. the solar heat collecting tube comprises a bracket, 2, a compound paraboloid, 3, a vacuum heat collecting tube, 31, an outer glass tube, 32, an inner glass tube, 4, a header, 41, a header (upper channel) interface, 42, a header (lower channel) interface, 5, a heat collecting tube partition plate, 6 and a header partition plate.

Detailed Description

Referring to fig. 2 and 3, the utility model relates to a compound parabolic spotlight heat collector of two heat absorption pipes, including installing evacuated collector tube 3 in compound parabolic concentrator 2 top, this compound parabolic concentrator 2 comprises two halfbodies of bilateral symmetry, and each halfbody comprises gradually bursting at the seams and parabola slick and sly connection, and the one end interconnect that gradually bursts at the seams of two halfbodies constitutes the whole that the cross-section is omega, its characterized in that the coke axis of two halfbodies of compound parabolic concentrator 2 on respectively set up evacuated collector tube 3, constitute a heat collector unit.

The vacuum heat collecting tube 3 is composed of an outer glass tube 31 and an inner glass tube 32 which are coaxially arranged and have an opening at one end and a closed other end, and a vacuum gap is reserved between the outer glass tube 31 and the inner glass tube 32; the outer surface of the inner glass tube 32 is plated with a selective absorption film (which is a conventional technique).

The diameter of the inner glass tube 32 is 37-58 mm, the diameter of the outer glass tube 31 is 47-70 mm, and the total length of the vacuum heat collecting tube 3 is 1.2-2.2 m. The compound parabolic condenser 2 (heat collector unit) matched with the vacuum heat collecting tube 3 has the incident and receiving angle of sunlight of +/-50 degrees and the light concentration ratio of 1.2-1.5.

The compound parabolic condenser 2 adopts a mirror-surface thin metal plate or a thin metal plate pre-coated with a mirror-surface reflective aluminized film to be cold rolled into a compound parabolic shape (the processing technology is the prior art, see patent 201811404280.7).

The compound parabolic condenser 2 is arranged on the bracket 1 or fixedly hung on the vacuum heat collecting tube 3 by a hanging rack.

Referring to fig. 4 and 5, a plurality of heat collector units and a header 4 can form a heat collector module, the header 4 is made of a stainless steel thin plate and has a rectangular cross section, two opposite sides are provided with holes, and the open ends (head ends) of a plurality of evacuated heat collecting tubes 3 are hermetically inserted into the holes on two sides of the header 4 (the joints of the two evacuated heat collecting tubes are sealed by a silicone ring); the compound parabolic condenser 2 is horizontally placed in east-west mode, and the header 4 is placed in north-south mode. The plurality of heat collector units are divided into two rows, namely a left row and a right row, to form a double-row heat collector module, the opening surface of the compound parabolic concentrator 2 faces sunlight at a set angle, and the header interfaces 41 at two ends of the header 4 are connected with an external water pump through a heat-conducting medium pipe to form a heat energy utilization circulation loop (the heat energy utilization circulation loop is a conventional technology and is not shown).

Referring to fig. 6-8, a collector tube partition plate 5 and a header partition plate 6 may be disposed in the vacuum collector tube 3 and the header 4, the collector tube partition plate 5 and the header partition plate 6 divide the vacuum collector tube 3 and the header 4 into an upper channel and a lower channel in parallel, respectively, a head end of the collector tube partition plate 5 is connected to the header partition plate 6, a gap is left between a tail end of the collector tube partition plate 5 and a closed end of the vacuum collector tube 3 (i.e., the tail end of the collector tube partition plate 5 is not inserted to the bottom), the upper channel and the lower channel in the vacuum collector tube 3 are communicated with each other by the gap, and a cross section of the gap is not smaller than a cross section of the upper channel or the. An upper channel port 41 and a lower channel port 42 communicating with the upper channel and the lower channel in the header 4 are provided at one end of the header 4, respectively. The upper channel port 41 and the lower channel port 42 may be provided at both ends of the header 4, respectively. The heat-conducting medium flows into the lower channel of the evacuated collector tube 3 from the lower half part of the header 4, then flows into the lower channel of the evacuated collector tube 3, turns back at the bottom (in the closed end) of the evacuated collector tube 3, flows into the upper channel of the header 4 through the upper channel, and then flows out from the lower channel connector 42 of the header 4.

The heat collecting pipe partition plates 5 and the header partition plates 6 are made of metal thin plates, such as stainless steel thin strips or copper metal strips.

The heat-conducting medium is liquid or gas, and the liquid comprises water, antifreeze or heat-conducting oil; the gas comprises air.

Referring to fig. 9 and 10, unlike the previous concentrator module: only one side of the header 4 is connected with a row of a plurality of the heat collector units, the compound parabolic condenser 2 is horizontally placed in the north and south directions, and the header 4 is placed in the east and west directions. The open end of the vacuum heat collecting pipe 3 is hermetically connected with the opening on one side of the header 4 to form a single-row structure heat collector module. The opening surface of the compound parabolic condenser 2 faces sunlight obliquely at a set angle, and the interfaces 41 at the two ends of the header 4 are connected with an external water pump to form a heat energy utilization circulation loop, so that solar energy is collected and converted into heat energy. The heat collector module of the single-side heat collecting tube is placed in the north and south to prevent snow accumulation. The heat collector module of the heat collecting tube shown in fig. 4 has low cost for placing things on both sides.

Claims

1. A double-heat-absorption-pipe composite parabolic light-gathering heat collector comprises a vacuum heat-collecting pipe (3) arranged above a composite parabolic light-gathering device (2), wherein the composite parabolic light-gathering device (2) is composed of two half bodies which are symmetrical left and right, each half body is composed of an involute and a parabola which are connected in a smooth way, and one ends of the involutes of the two half bodies are connected with each other to form a whole with a omega section, and the double-heat-absorption-pipe composite parabolic light-gathering heat collector is characterized in that the vacuum heat-collecting pipe (3) is respectively arranged on the focal axes of the two half bodies of the composite parabolic light-;

the vacuum heat collecting tube (3) is composed of an outer glass tube (31) and an inner glass tube (32) which are coaxially arranged and have an opening at one end and a closed other end, and a vacuum gap is reserved between the outer glass tube (31) and the inner glass tube (32); the outer surface of the inner glass tube (32) is plated with a selective absorption film.

2. The double-heat-absorption-pipe compound parabolic concentrator collector according to claim 1, wherein the diameter of the inner glass tube (32) is 37-58 mm, the diameter of the outer glass tube (31) is 47-70 mm, and the total length of the evacuated collector tube (3) is 1.2-2.2 m.

3. The double heat absorption tube compound parabolic concentrator collector of claim 1, wherein the compound parabolic concentrator is made of mirror-surface thin metal plate or thin metal plate pre-coated with mirror-surface reflective aluminum-plated film.

4. The parabolic concentrator collector with double heat absorption tubes according to claim 1, wherein a plurality of collector units and the header (4) form a collector module, and the open ends of a plurality of evacuated solar collector tubes (3) are hermetically inserted into one side or two opposite sides of the header; the opening surface of the compound parabolic condenser (2) faces to sunlight at a set angle, and upper channel interfaces (41) at two ends of the header (4) are connected with an external water pump through a heat-conducting medium pipe to form a heat energy utilization circulation loop; a heat collecting pipe partition plate (5) and a header partition plate (6) are arranged in the vacuum heat collecting pipe (3) and the header (4) in part, the vacuum heat collecting pipe (3) and the header (4) are respectively divided into an upper channel and a lower channel which are parallel by the heat collecting pipe partition plate (5) and the header partition plate (6), the head end of the heat collecting pipe partition plate (5) is connected with the header partition plate (6), a gap is reserved between the tail end of the heat collecting pipe partition plate (5) and the closed end of the vacuum heat collecting pipe (3), and the upper channel and the lower channel in the vacuum heat collecting pipe (3) are mutually communicated by the gap; an upper channel interface (41) and a lower channel interface (42) which are communicated with an upper channel and a lower channel in the header (4) are respectively arranged at the two ends of the header (4); the water flows into the lower part of the inner tube of the all-glass vacuum tube from the lower half part of the header, turns back at the bottom of the inner tube, flows into the upper half part of the header through the upper part of the tube, and then flows out of the water outlet pipe.

5. The double-heat-absorption-pipe compound parabolic light-concentrating collector according to claim 4, wherein the heat-conducting medium is liquid or gas, and the liquid comprises water, antifreeze or heat-conducting oil; the gas comprises air.