Flexible connection assembly for light-gathering parabola groove type heat collector

Abstract

The utility model discloses a flexible connection assembly used for a light-gathering parabola groove type heat collector, which comprises a plane rotating mechanism, a rotating shaft, at least one hard pipe section, at least one hose section I and at least one hose section II, the rotating shaft is arranged on a rotating axis of the plane rotating mechanism, one end of the rotating shaft is fixedly connected on an end plate of the heat collector, and the other end of the rotating shaft is fixedly connected on the end plate of the heat collector. The rotating shaft synchronously rotates along with the heat collector; the hard pipe section is fixed on the rotating shaft and synchronously rotates along with the rotating shaft; one end of the hose section I is connected with the outlet end of the heat collecting pipe, the other end is connected with the inlet end of the hard pipe section, one end of the hose section II is connected with the inlet end of the fixed pipeline, and the other end is connected with the outlet end of the hard pipe section. The flexible connecting assembly is adopted to replace a traditional ball head assembly, the requirement for low cost of groove type photo-thermal is met, 100% sealing and no leakage are achieved at the same time, and the flexible connecting assembly is suitable for heat transfer and storage media with higher temperature upper limit and oxidizability and has remarkable engineering practical value.

Description

Technical Field

[0001] The utility model belongs to the application field of trough collectors in the concentrated solar thermal industry, and particularly relates to a flexible connection assembly for a concentrated parabolic trough collector. Background Art

[0002] The trough solar thermal power generation system uses a focusing solar collector to convert solar radiation energy into thermal energy. The heat collected by the collector is transported to the heat utilization unit through other pipelines by the heat transfer medium in the heat collecting tube located on the focal line of the collector. In order to maximize the photothermal efficiency, the trough collector together with the heat collecting tube will track the angular movement of the sun. How to connect the moving heat collecting tube and the fixed heat transfer medium pipeline to realize the transmission of the heat transfer medium without affecting the rotation of the collector is an important engineering problem in the field of trough collectors. In addition, the length of a single heat collecting combination of a trough solar collector can reach more than 100 meters, and the expansion of the heat collecting tube as it absorbs heat and heats up is also very considerable, so the connection structure should also be able to absorb the expansion.

[0003] At present, mature commercial trough-type CSP projects mostly use ball head combinations to achieve the above purpose. However, this solution has the following limitations:

[0004] (1) The ball head itself is a dynamic connection component and cannot guarantee 100% sealing;

[0005] (2) The main component of ball head filler is graphite. The maximum temperature of conventional application is 400℃. The theoretical maximum temperature that can be tried does not exceed 430℃. In addition, graphite filler will produce a small amount of decomposition above 350℃, and filler needs to be added regularly, which increases operation and maintenance costs. In addition, graphite filler is difficult to use in oxidizing heat transfer media. The filler will reduce its life or even fail due to oxidation.

[0006] (3) Currently, the price of ball head combination connectors is very high, and the trough solar thermal power generation system has a large demand for them, resulting in a high production cost for the entire system. Utility Model Content

[0007] In order to overcome the above-mentioned shortcomings, the utility model provides a flexible connection assembly for a concentrating parabolic trough collector. The flexible connection assembly is used to replace the traditional ball head assembly, which can not only achieve 100% sealing and leakage-free while meeting the low-cost requirements of trough-type solar thermal, but also can be applied to heat transfer and heat storage media with higher temperature limits and oxidizing properties, and has significant practical engineering value.

[0008] The main technical solutions adopted in this utility model are:

[0009] A flexible connection assembly for a concentrating parabolic trough collector comprises a plane rotating mechanism, a rotating shaft, at least one hard pipe section, at least one hose section I and at least one hose section II, wherein the rotating shaft is mounted on the rotating axis of the plane rotating mechanism, one end of the rotating shaft is fixedly connected to the collector end plate and rotates synchronously with the collector; the hard pipe section is fixed on the rotating shaft and rotates synchronously with the rotating shaft; one end of the hose section I is connected to the outlet end of the collector pipe, and the other end is connected to the inlet end of the hard pipe section, and one end of the hose section II is connected to the inlet end of the fixed pipeline, and the other end is connected to the outlet end of the hard pipe section.

[0010] Preferably, the inlet end and the outlet end of the hard tube segment face any direction around the spherical surface of the planar rotating mechanism, and the inlet end and the outlet end of the hard tube segment are not arranged concentrically with the rotation center of the rotating shaft.

[0011] Preferably, the connections between the pipelines in the flexible connection assembly are made by welding or flange connection.

[0012] Preferably, the connection between each pipeline in the flexible connection assembly and the external pipeline is achieved by welding or flange connection.

[0013] Preferably, the connection between the hose section I and the heat collecting pipe and between the hose section II and the fixed pipe can be achieved by using an elbow connector or an extended pipe to achieve an adjustable angle or length connection.

[0014] Preferably, the planar rotating mechanism is one of a planar rotating joint, a rolling bearing or a sliding bearing.

[0015] Preferably, the rotation center of the rotating shaft, the rotation center of the planar rotating mechanism and the rotation center of the collector are arranged concentrically.

[0016] Preferably, the hard pipe section, hose section I and hose section II are provided with a thermal insulation layer and an electric heating device.

[0017] Beneficial effects: The utility model provides a flexible connection assembly for a concentrating parabolic trough collector, which has the following advantages:

[0018] (1) The utility model utilizes a combination of a hose section, a hard pipe section and a plane rotating mechanism to replace the traditional ball head combination, which can not only flexibly adjust the size and direction of the flexible connection assembly according to the on-site construction conditions, but also is convenient and quick, has strong applicability, greatly reduces the processing and manufacturing costs, and can achieve 100% leak-free connection.

[0019] (2) The flexible connection assembly of the utility model is not limited by graphite fillers and can be used for oxidizing heat transfer media with an operating temperature of more than 500°C. It can increase the efficiency of the steam turbine by increasing the temperature of the slot-type solar thermal heat transfer and heat storage medium, and further increase the energy storage temperature difference to reduce the amount of energy storage molten salt, which is conducive to optimizing the operating mode and providing a basis for ultimately reducing the unit electricity cost of the slot-type solar thermal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1;

[0021] In the figure: hose section Ⅰ1, hose section Ⅱ2, hard pipe section 3, plane rotating mechanism 4, rotating shaft 5, heat collecting pipe 6, fixed pipe 7, collector end plate 8. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application. Example 1

[0023] like Figure 1 As shown, a flexible connection assembly for a concentrating parabolic trough collector comprises at least one hose segment I1, at least one hose segment II2, at least one hard pipe segment 3, a plane rotating mechanism 4 and a rotating shaft 5, wherein the rotating shaft 5 is mounted on the rotating axis of the plane rotating mechanism 4, one end of the rotating shaft 5 is fixedly connected to the collector end plate 8, and rotates synchronously with the collector; the hard pipe segment 3 is fixed on the rotating shaft 5, and the hard pipe segment 3 rotates synchronously with the rotating shaft 5; one end of the hose segment I1 is connected to the outlet end of the collector pipe 6, and the other end is connected to the inlet end of the hard pipe segment 3; one end of the hose segment II2 is connected to the inlet end of the fixed pipeline 7, and the other end is connected to the outlet end of the hard pipe segment 3.

[0024] In the present invention, the inlet and outlet ends of the hard tube section 3 face any direction of the sphere surrounding the planar rotating mechanism 4 , and the inlet and outlet ends of the hard tube section 3 are not concentric with the rotation center of the rotating shaft 5 .

[0025] In the present invention, the rotation center of the rotating shaft 5 and the rotation axis of the plane rotating mechanism 4 are both arranged concentrically with the rotation center of the collector.

[0026] In this embodiment 1, the hard pipe section is made of 347 stainless steel pipe, and the hose section Ⅰ1 and the hose section Ⅱ2 are made of 347 stainless steel corrugated hose.

[0027] In the present invention, the connection between each pipe in the flexible connection assembly is welded or flanged. Specifically, those skilled in the art can make a selective design according to actual needs. In this embodiment 1, the inlet end of the hard pipe section 3 is connected to the outlet end of the same hose section Ⅰ1 through a flange, and the outlet end of the hard pipe section 3 is connected to the inlet end of the hose section Ⅱ2 through a flange.

[0028] In the utility model, the connection between each pipe in the flexible connection assembly and the external pipe is welded or flanged. Specifically, those skilled in the art can make a selective design according to actual needs. In this embodiment 1, the inlet end of the hose section I1 is connected to the outlet end of the heat collecting pipe 6 by a flange, and the outlet end of the hose section II2 is connected to the inlet end of the fixed pipe 7 by a flange.

[0029] In order to further improve the adjustment flexibility of the flexible connection assembly, in the utility model, the connection between the hose section Ⅰ1 and the heat collecting pipe 6 and between the hose section Ⅱ2 and the fixed pipe 7 can be adjusted in angle through elbow connectors of different angles as needed, or in length by using extension pipes of different lengths.

[0030] In the utility model, the plane rotating mechanism is one of a plane rotating joint, a rolling bearing or a sliding bearing, and those skilled in the art can selectively design it according to actual needs.

[0031] In order to further improve the energy utilization efficiency and reduce heat loss, in the utility model, an insulation layer and an electric heating device can be provided on the hard pipe section 3, the hose section Ⅰ1 and the hose section Ⅱ2 to prevent heat loss through the pipeline.

[0032] The working principle of the utility model is as follows:

[0033] The rotating shaft 4 is installed in the rotating axis of the plane rotating mechanism 4, and the plane rotating mechanism 4 provides support and positioning. The rotating shaft 5 is fixed together with the end plate 8 of the collector. When the collector and the heat collecting tube 6 track the sun, the rotating shaft 5 will rotate synchronously with the collector. The hard pipe section 3 is fixed on the rotating shaft 5. When the rotating shaft 5 rotates, the hard pipe section 3 will rotate synchronously with the rotating shaft 5, that is, the hard pipe section 3 rotates synchronously with the collector.

[0034] When the collector rotates, the hose section Ⅰ1 will rotate synchronously with the heat collecting tube 6 and the hard tube section 3. When the heat collecting tube 6 expands due to temperature rise, the hose section Ⅰ1 will bend axially in the heat collecting tube 6 to absorb the expansion. When the heat collecting tube 6 cools down, the position of the hose section Ⅰ1 is restored as the expansion decreases. When the collector rotates, the inlet end of the hose section Ⅱ2 will follow the outlet end of the hard tube section 3 to perform a movement mainly with a small swing.

[0035] In the utility model, the quantity, size, material, etc. of each connecting section can be selectively designed according to needs.

[0036] The flexible connection assembly of the utility model can realize 100% sealing without leakage while realizing the engineering needs at a low cost. In particular, the development of trough-type solar thermal projects faces the need to reduce costs. One of the main directions is to increase the upper temperature limit of heat transfer and heat storage media. Taking binary molten salt (potassium nitrate and sodium nitrate) as an example, the temperature of the high-temperature side is above 500°C and it is oxidizing. The traditional ball head combination scheme is no longer applicable. The high temperature resistance of the flexible connection assembly of the utility model makes it have significant practical engineering value.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A flexible connection assembly for a concentrating parabolic trough collector, characterized in that: It includes a planar rotating mechanism, a rotating shaft, at least one hard pipe section, at least one hose section I and at least one hose section II, wherein the rotating shaft is installed on the rotating axis of the planar rotating mechanism, one end of the rotating shaft is fixedly connected to the end plate of the collector and rotates synchronously with the collector; the hard pipe section is fixed on the rotating shaft, and the hard pipe section rotates synchronously with the rotating shaft; one end of the hose section I is connected to the outlet end of the collector pipe, and the other end is connected to the inlet end of the hard pipe section; one end of the hose section II is connected to the inlet end of the fixed pipeline, and the other end is connected to the outlet end of the hard pipe section.

2. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The inlet and outlet ends of the hard pipe section are oriented in any direction around the spherical surface of the plane rotating mechanism, and the inlet and outlet ends of the hard pipe section are not arranged concentrically with the rotation center of the rotating shaft.

3. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The connection between the pipelines in the flexible connection assembly is achieved by welding or flange connection.

4. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The connection between each pipeline in the flexible connection assembly and the external pipeline is achieved by welding or flange connection.

5. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The connection between the hose section I and the heat collecting pipe and between the hose section II and the fixed pipe can be achieved by using an elbow connector or an extended pipe to adjust the angle or length.

6. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The planar rotating mechanism is one of a planar rotating joint, a rolling bearing or a sliding bearing.

7. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The rotation center of the rotating shaft, the rotation center of the plane rotating mechanism and the rotation center of the collector are arranged concentrically.

8. The flexible connection assembly for a concentrating parabolic trough collector according to claim 1, characterized in that: The hard pipe section, hose section I and hose section II are provided with a thermal insulation layer and an electric heating device.

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