US-12618528-B2 - Pressure accumulator

US12618528B2US 12618528 B2US12618528 B2US 12618528B2US-12618528-B2

Abstract

A pressure accumulator includes a cylindrical body made of metal and configured to vaporize and store a liquefied gas in a storage space in the cylindrical body, a lid body having a through hole that allows a pipe to penetrate through the through hole, and being configured to close an opening end portion of the cylindrical body with a gap between the lid body and an inner peripheral surface of the cylindrical body, a sealing structure portion between an outer peripheral portion of the lid body and an inner peripheral portion of the cylindrical body, and a fixing part at the opening end portion of the cylindrical body, an outer peripheral surface of the fixing part being screw fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from an outer side of the lid body.

Inventors

Toshio Takano
Hiroshi Okano
Shusaku Takagi

Assignees

JFE STEEL CORPORATION

Dates

Publication Date: 20260505
Application Date: 20220609
Priority Date: 20210610

Claims (16)

1 . A pressure accumulator that causes a liquefied gas at a very low temperature that has been injected into the pressure accumulator from an outside through a pipe to vaporize and stores the liquefied gas, the pressure accumulator comprising: a cylindrical body made of metal and configured to vaporize and store the liquefied gas in a storage space in the cylindrical body; a lid body having a through hole that allows the pipe to penetrate through the through hole, the lid body being configured to fix the pipe passing through the through hole, and being configured to close an opening end portion of the cylindrical body with a gap provided between the lid body and an inner peripheral surface of the cylindrical body, the gap communicating with the storage space of the cylindrical body; a sealing structure portion provided between an outer peripheral portion of the lid body and an inner peripheral portion of the cylindrical body, the sealing structure portion being configured to fill in at least a portion of the gap; a fixing part provided at the opening end portion of the cylindrical body, an outer peripheral surface of the fixing part being screw fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from an outer side of the lid body; and a heat insulating part provided between the lid body and the fixing part, wherein the lid body is provided entirely inward of the fixing part relative to an axial direction of the cylindrical body such that the fixing part and the lid body do not overlap along a radial direction of the cylindrical body.
2 . The pressure accumulator of claim 1 , wherein the lid body includes a screw fastening portion configured to cause the pipe passing through the through hole to be fixed by screw fastening, and a sealing part is provided between an inner peripheral portion of the lid body and an outer peripheral portion of the pipe to close a space formed between the inner peripheral portion of the lid body and the outer peripheral portion of the pipe.
3 . The pressure accumulator of claim 1 , wherein the lid body includes a welding-fixing portion at which the pipe passing through the through hole can be fixed by welding.
4 . The pressure accumulator of claim 1 , wherein the lid body is made of austenitic stainless steel.
5 . The pressure accumulator of claim 1 , further comprising a temperature detection unit configured to detect a temperature of a liquefied gas, which is vaporized, stored in the storage space of the cylindrical body, or a temperature of the lid body.
6 . The pressure accumulator of claim 1 , wherein the lid body includes a screw fastening portion configured to cause the pipe passing through the through hole to be fixed by screw fastening, a sealing part is provided between an inner peripheral portion of the lid body and an outer peripheral portion of the pipe to close a space formed between the inner peripheral portion of the lid body and the outer peripheral portion of the pipe, and the lid body is made of austenitic stainless steel.
7 . The pressure accumulator of claim 1 , wherein the lid body includes a welding-fixing portion at which the pipe passing through the through hole can be fixed by welding, and the lid body is made of austenitic stainless steel.
8 . A pressure accumulator that causes a liquefied gas at a very low temperature that has been injected into the pressure accumulator from an outside through a pipe to vaporize and stores the liquefied gas, the pressure accumulator comprising: a cylindrical body made of metal and configured to vaporize and store the liquefied gas in a storage space in the cylindrical body; a lid body having a through hole that allows the pipe to penetrate through the through hole, the lid body being configured to fix the pipe passing through the through hole, and being configured to close an opening end portion of the cylindrical body with a gap provided between the lid body and an inner peripheral surface of the cylindrical body, the gap communicating with the storage space of the cylindrical body; a sealing structure portion provided between an outer peripheral portion of the lid body and an inner peripheral portion of the cylindrical body, the sealing structure portion being configured to fill in at least a portion of the gap; and a fixing part provided at the opening end portion of the cylindrical body, an outer peripheral surface of the fixing part being screw fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from an outer side of the lid body, wherein the lid body is provided entirely inward of the fixing part relative to an axial direction of the cylindrical body such that the fixing part and the lid body do not overlap along a radial direction of the cylindrical body, and the lid body includes an inner lid body made of austenitic stainless steel, and disposed at a position close to the storage space of the cylindrical body, and an outer lid body made of low alloy steel, and disposed at a position close to the fixing part.
9 . The pressure accumulator of claim 8 , wherein a heat insulating part is provided between the inner lid body and the outer lid body, and a heat insulating part is provided between the outer lid body and the pipe.
10 . The pressure accumulator of claim 8 , wherein the cylindrical body includes a first vent hole configured to cause an outside of the cylindrical body to communicate with the gap to inject a gas into the gap from the outside of the cylindrical body, and a second vent hole configured to cause the outside of the cylindrical body to communicate with the gap to discharge the gas injected into the gap through the first vent hole to the outside of the cylindrical body.
11 . The pressure accumulator of claim 10 , wherein of an end surface of the inner lid body and an end surface of the outer lid body that face each other, either one of the end surface of the inner lid body or the end surface of the outer lid body or both of the end surface of the inner lid body and the end surface of the outer lid body has a groove portion through which the gas injected into the gap circulates.
12 . The pressure accumulator of claim 11 , wherein the groove portion includes a plurality of annular groove portions, and a coupling groove portion communicating with the gap and configured to connect the plurality of annular groove portions to each other.
13 . The pressure accumulator of claim 8 , wherein the lid body includes a screw fastening portion configured to cause the pipe passing through the through hole to be fixed by screw fastening, and a sealing part is provided between an inner peripheral portion of the lid body and an outer peripheral portion of the pipe to close a space formed between the inner peripheral portion of the lid body and the outer peripheral portion of the pipe.
14 . The pressure accumulator of claim 8 , wherein the lid body includes a welding-fixing portion at which the pipe passing through the through hole can be fixed by welding.
15 . The pressure accumulator of claim 8 , wherein the lid body includes a screw fastening portion configured to cause the pipe passing through the through hole to be fixed by screw fastening, a sealing part is provided between an inner peripheral portion of the lid body and an outer peripheral portion of the pipe to close a space formed between the inner peripheral portion of the lid body and the outer peripheral portion of the pipe, and a first heat insulating part is provided between the inner lid body and the outer lid body, and a second heat insulating part is provided between the outer lid body and the pipe.
16 . The pressure accumulator of claim 8 , wherein the lid body includes a welding-fixing portion at which the pipe passing through the through hole can be fixed by welding, and a first heat insulating part is provided between the inner lid body and the outer lid body, and a second heat insulating part is provided between the outer lid body and the pipe.

Description

TECHNICAL FIELD The present disclosure relates to a pressure accumulator that stores vaporized liquefied gas. BACKGROUND ART Conventionally, there are various known pressure accumulators that store vaporized liquefied gas therein, and that are already put into practice. In general, liquefied hydrogen that is carried by a liquid hydrogen lorry and that is stored in a storage tank is vaporized by a vaporizer, and is compressed by a compressor into a high pressure and, thereafter, is injected into a pressure accumulator through a pipe. A hydrogen gas pressure accumulator disclosed in the following Patent Literature 1, for example, is configured to include a cylindrical cylinder portion, lid portions, and threaded portions, the cylindrical cylinder portion being made of steel and being configured to store vaporized liquefied gas in the cylindrical cylinder portion, the lid portions being configured to hermetically seal both end portions of the cylindrical cylinder portion in an openable manner, the threaded portions being configured to fix the lid portions to the cylindrical cylinder portion. CITATION LIST Patent Literature Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2019-82188 SUMMARY OF INVENTION Technical Problem Adopting a configuration can be considered in which liquefied gas at a very low temperature is injected into a pressure accumulator from the outside through a pipe, and is vaporized therein and is stored in the pressure accumulator, so that a vaporizer is not necessary. However, in the hydrogen gas pressure accumulator disclosed in Patent Literature 1, although the cylindrical cylinder can withstand only approximately −30 degrees C., for example, the temperature of liquid hydrogen is approximately −260 degrees C. and hence, there is a possibility that the temperature of the lid portion is lowered due to the heat conduction caused by liquid hydrogen at a very low temperature flowing through the pipe, thus lowering the temperature of the cylindrical cylinder to which heat is conducted from the lid portion, causing a brittle fracture in the cylindrical ring. The present disclosure has been made to solve the above-mentioned problem, and it is an object of the present disclosure to provide a pressure accumulator that can vaporize and store liquefied gas without causing a brittle fracture in the cylindrical body even when liquefied gas at a very low temperature is injected into the pressure accumulator from the outside through a pipe. Solution to Problem A pressure accumulator according to an embodiment of the present disclosure is a pressure accumulator that causes a liquefied gas at a very low temperature to be injected into the pressure accumulator from an outside through a pipe to vaporize and store the liquefied gas, the pressure accumulator including: a cylindrical body made of metal and configured to vaporize and store the liquefied gas in a storage space in the cylindrical body; a lid body having a through hole that allows the pipe to penetrate through the through hole, the lid body being configured to fix the pipe passing through the through hole, and being configured to close an opening end portion of the cylindrical body with a gap provided between the lid body and an inner peripheral surface of the cylindrical body, the gap communicating with the storage space of the cylindrical body; a sealing structure portion provided between an outer peripheral portion of the lid body and an inner peripheral portion of the cylindrical body, the sealing structure portion being configured to fill in at least a portion of the gap; and a fixing part provided at the opening end portion of the cylindrical body, an outer peripheral surface of the fixing part being screw fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from an outer side of the lid body. Advantageous Effects of Invention According to the embodiment of the present disclosure, the gap is provided between the outer peripheral portion of the lid body and the inner peripheral portion of the cylindrical body, and at least a portion of the gap is filled with the sealing structure portion and hence, the gap serves as a heat-insulating layer, thus suppressing heat conduction from the lid body to the cylindrical body and suppressing a brittle fracture in the cylindrical body. Accordingly, by causing liquefied gas at a very low temperature to be injected into the pressure accumulator from the outside through a pipe, it is possible to vaporize and store the liquefied gas. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view schematically showing the internal structure of one end of a pressure accumulator according to Embodiment 1. FIG. 2 is a cross-sectional view schematically showing the internal structure of one end of a modification of the pressure accumulator according to Embodiment 1. FIG. 3 is a cross-sectional view schematically showing the internal structure of o