JPS5886351A - Vacuum tube type high temperature solar heat collector - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process of the titled solar heat collector to thereby increase the economical property thereof by a method wherein a vessel in which a metallic substance capable of adsorbing and storing hydrogen is sealed and a vessel having hydrogen sealed therein are provided in a cover glass pipe and a part of the sealed vessel is opened after the pressure in the cover glass is reduced, so that the metallic substance in the first mentioned vessel is hydrated. CONSTITUTION:A heat collecting plate 2 and a copper plate 3 capable of allowing a heat medium to pass therethrough are provided in the copper glass pipe 1 of the vacuum tube type heat collector and the copper vessel 4 in which a suitable amount of the metallic substance capable of adsorbing and storing hydrogen is fixed to the heat collecting pipe. Further, a glass capsule 5 having hydrogen sealed therein is fixed to the copper pipe 3 by means of a metal fitting 6. Thus, when an AC current is flowed through a primary coil wound around the glass pipe 1, an inductive current generates in the coil to energize a heating element 7 and the capsule 5 melts to break its seal. As a consequence, the hydrogen sealed in the capsule 5 fills the interior of the glass pipe with the hydrogen and the hydrogen adsorbing and storing metallic substance or its alloy is hydrogenated so that the releasing of the hydrogen from the capsule 5 at the time of manufacture of the solar heat collector or the oxidation of the hydrogenated metallic substance is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum tube type high-temperature solar heat collector that is simple and can prevent dry firing.

In general, vacuum tube type solar collectors efficiently convert sunlight into heat, so when the collector is installed or when the pump stops or breaks down, the heat collector plate is heated more than necessary, and the VC in the summer is The temperature will reach over 300℃. This causes the heat collector plate to deteriorate and eventually impair the properties of the heat collector.

Therefore, it is important to take measures to prevent the temperature from exceeding a predetermined temperature as much as possible.

Since then, in order to prevent the vacuum tube type heat collector from drying out, a reversible hydrogen getter made of a hydrogen-permeable container was installed inside the cover glass tube to take advantage of the convective heat loss caused by high hydrogen as the temperature rises. The technique is known. However, since this known technique requires the use of an active hydride, there is a disadvantage that the hydride releases hydrogen or oxidizes during production. In addition, the conventional structure is such that the heat obtained from the cover glass tube is transmitted through the glass wall to the heat transfer medium in the adjacent duct, and it has excellent utility value because it is a built-in type. The heat exchange loss was greater than that of a cover glass tube in which a heat transfer channel was provided, and it could not necessarily be said to be good for applications that require high-temperature heat collection, such as air conditioning.

In view of the above-mentioned drawbacks compared to VC, a vacuum tube type solar collector is provided, which is characterized by providing a sealed container (2 tons, -) in which all-pole hydride is sealed, and opening the container in an evacuated cover glass tube. A manufacturing method is proposed. However, although this method has the advantage that any type of hydrogen-absorbing gold N-u material can be used, it requires a relatively complicated process of forming a metal hydride in advance, resulting in high manufacturing costs. Furthermore, in order to prevent dry firing, the glass sealed container must be in close contact with the heat collecting plate or heat collecting tube, so mechanical destruction methods cannot be used, and the means of opening the container are naturally limited. there were.

The present invention aims to solve these drawbacks and simplify the manufacturing process and improve its economic efficiency.The present invention aims to simplify the manufacturing process and improve its economic efficiency.
The present invention provides a vacuum tube type heat collector that can prevent dry firing by hydrogenating a hydrogen storage capacity, and has the following features. ■Since the hydrogenation and vacuum evacuation processes for a small sealed container can be omitted, the manufacturing equipment is simplified, and the need for repeated hydrogenation processes reduces manufacturing costs. ■Since a certain amount of hydrogen can be sealed, the hydrogen equilibrium pressure can be set accurately. Furthermore, (1) the mounting position of the cartridge and its storage may be arbitrary, as long as it is eventually opened.

The details of the present invention will be explained below. In a vacuum tube type solar heat collector that prevents dry firing by utilizing the hydrogen absorption and release phenomenon of metal hydrides, there is provided a container in which a metal sintered alloy capable of storing hydrogen is housed inside a cover glass tube without sintering; A closed container containing the hydrogen necessary to hydrogenate the metal is provided, and degassing is performed at 250°C or higher. This is the first step. Next, this sealed container is broken, and any means may be used. For example, a mechanical method or a method using electromagnetic induction may be used.

The details of the present invention will be explained regarding the latter case. At least a portion of the container is made of glass, and generally a glass tube made of soda glass or lead glass or a glass tube fused to a metal container can be used. The heating element for opening the capsule is preferably a metal adhesive that is easily heated by high frequency waves, such as molybdenum, tungsten, iron chromium, R7 Kelchromium, or nickel. The metal fittings that form the heating element and the metal body to securely hold the capsule are made of a material that has elasticity such as phosphor bronze and is not easily heated by high frequency waves, or is made of materials with different coefficients of thermal expansion. It is best to use a material that can be made elastic by heat.

Further mechanical methods can be used, such as impacting the glass part of the capsule with a steel ball or breaking the capsule by dropping it onto the wall of a cover glass tube.

The amount of hydrogen inserted into the capsule is generally about 10% at a temperature below a certain temperature, in order to not impair the characteristics of the vacuum tube type heat collector.
-'t, orr or less, and about 10-2 at the desired upper temperature limit
-10' torr or more.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of one embodiment of the vacuum tube type heat collector of the present invention, in which 1 is a cover glass tube of the vacuum type heat collector, 2 is a cover glass tube of the vacuum type heat collector;
3 is a heat collecting plate, 3 is a copper pipe through which a heat medium passes, 4 is a metal containing an appropriate amount of hydrogen storage, and (5) a copper container capped with a sintered metal filter is fixed and held on the heat collecting plate 2 by a sintered metal filter. There is. In addition, 5 has an appropriate amount of hydrogen hermetically sealed in it, and is fixedly held at . Figures 2 and 3 are diagrams showing an example of a Kasisel used, which is a ring-shaped body formed by welding both ends of a heating element 70 made of a molybdenum wire of φ02 mm to an elastic metal plate 8 made of Rinyo copper. The capsule 5 is held fixed by elasticity. When an alternating current is passed through a part of the coil surrounding the outer periphery of the cover glass tube, an induced current is generated in the annular body, and the current is passed through the heating element 7, so that the case cell 5 is melted and opened. At this time, the heating element 7Fi comes into close contact with the capsule due to the elasticity of the metal plate 8, and when the capsule melts, it sinks into the capsule and can be opened.

Further, another example using a mechanical method will be described. FIG. 4 shows how to place the capsule, which is hooked onto the pipe 3 using a metal fitting 9.

Although it does not come off due to gentle rotation, it comes off from the pipe due to rapid rotation and vibration, colliding with the tube wall and breaking. hydrogenates the alloy.

In one example using a Zr-Mn alloy as the metal capable of storing hydrogen, hydrogenation at the same temperature after degassing at 400°C yields lx10t in the temperature range below 100°C.
The hydrogen equilibrium pressure is below orr and the pressure is reduced, but at 200℃
In this case, the hydrogen equilibrium pressure was about 1×10 torr or more.

As described above, the present invention provides a container in which a metal capable of storing hydrogen is stored and a container in which hydrogen is sealed inside, are provided in a cover glass tube, the pressure is reduced, and then a portion of the sealed container is opened, whereby hydrogen is absorbed. It is characterized by the fact that hydrogen is released during production, or metal hydrogenation is carried out.
! It is possible to prevent l from oxidizing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a vacuum tube type solar heat collector according to an embodiment of the present invention, and FIGS. 2, 3, and 4 are configuration diagrams of the main parts of FIG. 1. 1... Cover glass tube, 2... Heat collecting plate, 3... Copper pipe, 4... Silver type container, 5... Capsule, 6...
・Metal fittings, 7... Heating element, 8... Elastic metal plate, 9.
...Metal fittings. Patent applicant Matsushita Electric Industrial Co., Ltd., agent
Kouji Hoshino-13.

Claims (1)

[Claims] A heat collector plate that converts sunlight into heat, a heat medium pipe connected to the heat collector plate, a container containing a metal or alloy capable of storing hydrogen, and a cover glass tube that is inserted into the tube and then opened. A vacuum tube type high-temperature solar heat collector having a special feature that a hydrogen-filled container is enclosed in the cover glass tube.