JPH04263787A - Hot isostatic pressurizing device - Google Patents

Abstract

PURPOSE:To utilize both of sensible heat and latent heat and contrive the improvement of a heat absorbing capacity per unit weight of a heat accumulator as well as the reduction of the weight of the same by a method wherein the sealed type heat accumulator, whose inside is filled with molten salt, is arranged in a space formed between a high-pressure vessel and the heat insulating layer of a furnace chamber. CONSTITUTION:A high-pressure chamber 4 is formed of a high-pressure cylinder 1, an upper lid 2 and a lower lid 3, which are contacted closely so as to be detachable. A furnace chamber 7 is formed of a heat insulating layer 5, arranged in the high- pressure chamber 4, and a heater 6, arranged at the inside of the heat insulating layer 5. On the other hand, a body 12 to be treated is set on a supporting member 19, arranged on the lower lid 3 and equipped with a lower heat insulating section 18, through a table plate 11 to effect necessary treatment. In a cooling process after treatment, a mixing pump 13 and a circulating pump 14 are driven by a motor 16. In this case, a sealed vessel 17 is formed so as to have the shape of a bellows and the inside of the vessel 17 is filled with molten salt 21. A heat accumulator is constituted of a plurality of sealed vessels 17 arranged in parallel. According to this method, the heat absorbing capacity per unit weight of the heat accumulator is improved and the reduction of the weight thereof can be achieved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing hot isostatic pressure treatment, and more particularly to an apparatus for rapidly cooling a high-temperature object to be treated.

0002

[Prior Art] Recently, there has been a demand for hot isostatic pressurization equipment (hereinafter referred to as HIP) that shortens the time required for one cycle and improves productivity by rapidly cooling high-temperature workpieces. It's increasing. Therefore, in order to implement the above-mentioned rapid cooling, a heat storage device was installed in the space formed between the high-pressure vessel and the heat insulating layer of the furnace chamber.
It is disclosed in Japanese Patent No. 1-205761. This invention provides a method for rapidly cooling the contents of a HIP device by forcibly generating a gas flow from a HIP material heated in the container toward the inner wall of the container.
In the internal space of the cold zone b 2 a regenerator c 2 consisting of metal balls c' is arranged, through which a cooling gas flow coming from the HIP substance d 2 is passed. According to this invention, the high temperature pressure medium gas inside the furnace chamber e directly reaches the container a and the lid a', excessively heating them and threatening the safety of the pressure container. The problem of fatigue caused by thermal stress during rapid cooling of high-pressure vessels was temporarily resolved.

0003

[Problem to be solved by the invention] In recent years, the demand for large-sized HIP equipment has been increasing, but the larger the size, the longer it takes to cool down after HIP processing, so a rapid cooling function is an essential requirement. It becomes. However, the size of the heat storage device increases in proportion to the volume of the furnace chamber. In other words, when the processing chamber has a diameter of 300 mm and a height of about 600 mm, the heat storage device weighs about 100 kg, but it weighs about 1500 mm; H2
A large machine in the 400mm class requires a heat storage device of approximately 10 tons.

[0004] Installing this heat storage device on a structure inside a high-pressure vessel causes problems such as deformation of the structure. Further, when replacing the objects to be treated, it is necessary to attach and detach the heat storage device, which is difficult to handle. Therefore, reducing the weight of the heat storage device is an essential issue in achieving rapid cooling in a large HIP device. The present invention aims to solve the above-mentioned problems of the prior art and to reduce the weight of a heat storage device.

[0005]

[Means for Solving the Problems] In order to achieve this object, the present invention has the following configuration. That is, the hot isostatic pressurizing device according to the present invention is a hot isostatic pressurizing device that cools the furnace chamber by circulating a pressure medium gas, and the hot isostatic pressurizing device is a hot isostatic pressurizing device that cools the furnace chamber by circulating pressure medium gas. The heat storage device is characterized in that a closed-type heat storage device is provided in the space portion filled with molten salt, and preferably the heat storage device is formed of a bellows.

[0006]

[Operation] By using molten salt as the heat storage medium of the heat storage device, the heat of fusion of the molten salt can be used as a heat absorption source. Therefore, since not only the sensible heat accompanying the temperature rise of the heat storage medium but also the latent heat (heat of fusion) is used as a heat absorption source, the heat absorption capacity per unit weight of the heat storage device is improved and its weight can be reduced.

[0007] This action will be explained in more detail as follows. In other words, 1kg of heat storage medium is heated to 200℃
The amount of heat absorbed to reach 500°C (state before rapid cooling) to 500°C (state after rapid cooling) is 180°C for steel.
Molten salt (LiF-BeF2) is 1120 for KJ
KJ, and has approximately 6.6 times the heat absorption capacity per unit weight. As is clear from the above comparison, it is possible to reduce the weight of the heat storage device.

[0008]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes a high-pressure cylinder, and an upper cover 2 and a lower cover 3 are airtightly inserted into and removed from the upper and lower openings of the cylinder. A heat insulating layer 5 and a heater 6 are placed around the inside of the furnace chamber 7 to form the main part of the HIP apparatus. HIP is installed on the base plate 11 supported by the support member 19 provided with the lower heat insulation part 18.
Processing takes place.

The heat insulating layer 5 is constructed by filling a heat insulating material between the inner and outer casings 8 and 9 in the shape of an inverted cup, and the lower ends thereof are each airtightly fixed to a retaining ring 10. Furthermore, the openings 8A and 9A are located at the top.
A gas flow path from the furnace chamber 7 is opened and closed by opening and closing an opening 8A by a valve 15 attached to the lower end of a piston shaft that can move freely up and down in a cylinder 20 installed in the upper lid 2.

Reference numeral 14 denotes a circulation pump, which is driven together with the stirring pump 13 by an electric motor 16 in the cooling process after the HIP process. Reference numeral 17 denotes a closed container, which is made of metal and has a bellows shape, and contains a molten salt 21 such as LiF-
Filled with BeF2. At this time, the closed container 20 has a bellows shape, so that it can promote heat transfer with the pressurized gas, absorb volumetric expansion when the molten salt 21 liquefies, and follow volumetric contraction when the molten salt 21 solidifies. become. A heat storage device is constructed by arranging a plurality of these closed containers 17 side by side.

In the cooling step after the HIP treatment, the opening 8A is opened by operating the valve 15, and the circulation pump 14 is driven, so that the high temperature pressure medium gas inside the furnace chamber 7 flows out through the gas openings 9A and 8A. Next, the pressure medium gas radiates heat to the closed container 17, is cooled to the extent that the inner surface of the high pressure container is not excessively heated, and flows down between the upper lid 2 and the high pressure cylinder 1. During this time, the molten salt 21 functions as a heat storage medium and undergoes a phase transition from solid to liquid. Regarding the position where the heat storage device is provided, in the above embodiment, it is placed at the top of the heat insulating layer, but the position is not limited to this, and it is of course possible to change the position without departing from the technical idea of the present invention. It is.

0012

[Effects of the Invention] The following effects can be obtained by this invention. By using a molten salt as a heat storage medium in place of the conventional metal balls that used only sensible heat as a heat absorbing source, not only sensible heat but also heat of fusion can be used as a heat absorbing source. the result,
The same heat storage capacity can be obtained with a heat storage device that weighs less than conventional heat storage devices, making it possible to reduce the weight of the heat storage device.

Furthermore, by adopting a bellows shape for the structure of the heat storage device, the change in volume caused by the phase change of the molten salt inside the heat storage device can be stably followed under pressure. This makes it possible to perform rapid cooling of a large HIP on an industrial scale stably and with high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a hot isostatic pressing device according to the present invention.

FIG. 2 is a schematic diagram of a conventional hot isostatic pressurizing device.

[Explanation of symbols]

1 High pressure container 5　Heat insulation layer 7 Furnace room 12 Object to be processed 17 Sealed container 21 Molten salt

Claims (2)

[Claims] Claim 1: In a hot isostatic pressurizing device that cools a furnace chamber by circulating pressurized gas, a hermetically sealed and internally mounted A hot isostatic pressurizing device characterized by being equipped with a heat storage device filled with molten salt. 2. The hot isostatic pressurizing device according to claim 1, wherein the heat storage device is formed by a bellows.