CN201149164Y - Vacuum multi-layer thermally insulated cryogenic vessel with manhole structure - Google Patents

Abstract

The utility model is applied to a vacuum heat-insulating low-temperature container, in particular to a vacuum multi-layer heat-insulating low-temperature container with a manhole structure. The problem of heat insulation and cold preservation of the manhole opening in the vacuum multi-layer heat insulation container is solved, and the problem of temperature stress compensation of the inner and outer containers is solved. A bellows compensator is provided between the heads of the inner and outer containers, a flange is provided on the head of the inner container, a flat cover is provided on the flange, and a spherical head with a flange is provided on the head of the outer container. A support pipe is provided between the heads of the inner and outer containers, and a glass fiber reinforced plastic support is provided between the support pipe and the lower flange. The sealed empty shell formed by local isolation reduces heat leakage and improves the evaporation rate index. Through the stretching of the corrugated compensator connected with the inner container, the inner container and the outer container can find a stress balance point, which solves the problem of relative displacement between the inner container and the outer container due to the temperature difference. This structure not only makes the manhole convenient to use, but also solves the problems of heat transfer and supporting structure.

Description

Vacuum multi-layer thermally insulated cryogenic vessel with manhole structure

technical field

The utility model is applied to a vacuum heat-insulating low-temperature container, in particular to a vacuum multi-layer heat-insulating low-temperature container with a manhole structure.

Background technique

Manholes are very important in the design of pressure vessels, and large cryogenic liquid containers often need to install manholes. As for the structure, there are several relevant standards: the industry standard of the Ministry of Chemical Industry includes "Stainless Steel Manholes and Handholes" HG21594-21604, "Carbon Steel, Low Alloy Steel Manholes and Handholes" HG21514-21535; the machinery industry standards include " Oblong rotary cover quick opening manhole, etc." JB579-592, "Boiler manhole and head hole device" JB/T 2190. Above-mentioned these standard manholes all are to offer on the single-layer container, and the relevant documents and patents of checking are also the technology of opening the manhole on the relevant single-layer container. Offering manholes for vacuum multi-layer insulation containers has not yet been seen. Due to the possible problems of gas purity and operating level during the use of the container, in order to facilitate the cleaning of the vacuum multi-layer insulation container and the maintenance of the liquid level gauge, it is necessary to set a manhole on the head, and it must not cause a large heat leakage. , affects the evaporation rate index of the whole container. In actual production, the manholes of stacked heat-insulated containers are often connected. Fibrous insulation is filled in between, the insulation effect is not ideal, the heat leakage is large, and the operation is inconvenient. In addition, the liquid level gauge cannot be installed on its structure, and one more liquid level gauge installation hole needs to be opened. The more holes are opened, the more unfavorable it is for the heat insulation of the container. In addition, there are also problems of temperature stress compensation of the inner and outer cylinders in the operating state of the vertical container and the radial support of the inner cylinder when the container is transported horizontally.

Contents of the invention

The purpose of the utility model is to provide a vacuum multi-layer thermal insulation cryogenic container with a manhole structure, which solves the problem of heat insulation and cold preservation of the vacuum multi-layer thermal insulation container with a manhole, and solves the problem of temperature stress compensation of the inner and outer containers.

The technical solution for realizing the purpose of the utility model: a vacuum multi-layer heat-insulated low-temperature container with a manhole structure, including an inner container and an outer container, and an outer container is arranged outside the inner container. There is a bellows compensator, a flange is arranged on the head of the inner container, a flat cover is arranged on the flange, and a spherical head with a flange is arranged on the head of the outer container.

A support tube is provided between the inner and outer container heads, and a glass fiber reinforced plastic support is provided between the support tube and the lower flange.

Effects of the present invention: (1) A closed cavity is composed of a flanged spherical head, a corrugated compensator, a flange and a flat cover, and the sealed hollow shell formed by partial isolation makes pumping easy, reduces heat leakage, and improves the evaporation rate index . (2) When the low-temperature medium is contained, the inner container shrinks when it is cold, and the inner container and the outer container find a stress balance point through the stretching of the corrugated compensator connected to the inner container, which solves the relative displacement of the inner and outer containers due to the temperature difference question. (3) The spherical head with flange makes installation and disassembly convenient. (4) During horizontal transportation, the weight of the inner container is transmitted to the outer container through the support tube by the support of glass fiber reinforced plastic, so that the inner container is supported in the radial direction, and slides up and down with the expansion and contraction of the corrugated compensator in the operating state to ensure the centering of the container , due to the small thermal conductivity of FRP, the heat leakage is very small. This structure not only makes the manhole convenient to use, but also solves the problems of heat transfer and supporting structure. It is a very reasonable and efficient structure for the vacuum multi-layer heat insulation container.

Description of drawings

Fig. 1 is the structural diagram of existing vacuum multi-layer thermal insulation cryogenic container manhole structure;

Fig. 2 is a structure diagram of a vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to the present invention.

In the figure: 1 reinforcement rib; 2 corrugated compensator; 3 reinforcement pipe; 4. support pipe; 5. connecting ring; 6 spherical head with flange; 7 bursting membrane; 8 handle; 9 cable joint; 11 Gasket; 12 Bolt; 13 Nut; 14 Gasket; 15 Upper flange; 16 Reinforcing ring; 17 Outer container head; 18 Flat cover; 19 Flange; 23 heat insulation layer; 24 inner container head; 25 liquid level gauge support; 26 heat insulation layer.

Detailed ways

Below in conjunction with accompanying drawing, the content of the present utility model is described in further detail.

The outer container is covered with the inner container, and the lower flange 22 is welded at the opening of the inner container head 24 and outside the heat insulating layer 23, and the flange 19 is installed in the groove outside the middle through hole on the upper end surface of the lower flange 22 by means of bolts. , The lower end of the flange 19 is welded with a cylindrical liquid level gauge support 25, and the upper end is installed with a flat cover 18 by means of bolts, and a cable joint 9 and a handle 8 are welded on the flat cover 18. The outer container head 17 is welded with reinforcing pipe 3 and the outer surface with welded reinforcing ring 16, its opening is welded with upper flange 15, and the lower end of upper flange 15 is welded with support pipe 4, and support pipe 4 is located between the inner and outer containers. Between support tube 4 and lower flange 22, fiberglass support 21 is installed, and the lower end of fiberglass support 21 is supported on the outer ring platform outside lower flange 22, and the upper end is fixed by means of back-up ring 20 on the lower flange 22. Its retaining ring 20 is installed on the upper end surface boss of the lower flange 22 by means of bolts, and the connecting ring 5 welded at the opening of the upper flange 15 . A cylindrical corrugated compensator 2 is welded on the upper end surface of the lower flange 22 between the flange 19 and the retaining ring 20 and the inner ring of the connecting ring 5 . The bellows compensator 2 is wrapped with a heat insulating layer 26 . The upper end surface of the upper flange 15 is installed with a flanged spherical head 6 by means of bolts 12 , nuts 13 and gaskets 14 , and the upper flange 15 and the flanged spherical head 6 are sealed by means of a gasket 11 . A bursting membrane 7 is welded on the spherical head 6 with a flange, and a cable joint 9 and a handle 8 are provided.

Spherical head with flange 6, corrugated compensator 2, flange 19 and flat cover 18 form a closed cavity, which is evacuated to 1×10 ^-3 Pa by vacuum valve 10 to reach a high vacuum degree. At the same time, the use of the corrugated compensator 2 makes the conduction heat transfer length longer, which reduces the cooling loss as much as possible. At the same time, in order to prevent air leakage, destruction of vacuum, and structural failure, a bursting membrane 7 is installed on the flanged spherical head. Once air leakage occurs due to poor sealing and the pressure reaches a certain value, the bursting membrane will break and alarm, ensuring the shell. Space safe. The local small space makes it easy to evacuate, and the required vacuum degree can be achieved in a short time.

During horizontal transportation, the weight of the inner cylinder is transferred to the outer cylinder through the support tube 4 by the fiberglass support 21, so that the inner cylinder is supported in the radial direction, and slides up and down with the expansion and contraction of the corrugated compensator in the operating state to ensure the centering of the container , due to the small thermal conductivity of FRP, the heat leakage is very small.

Because the liquid level gauge of the vertical container will usually be installed at the manhole, it is easy to operate and overhaul (the cable joint 9 and the liquid level gauge support 25 are all set for the use of the liquid level gauge), the setting of the handle 8 can be easily It is convenient to open the space, and the hollow structure of the manhole makes the installation and maintenance of the liquid level gauge very convenient. At the same time, open the flanged spherical head 6 and the flat cover 18 to enter the inner container very conveniently.

Claims (10)

1. A vacuum multi-layer heat-insulated low-temperature container with a manhole structure, comprising an inner container and an outer container, and an outer container is arranged outside the inner container, and is characterized in that: a bellows compensator is arranged between the heads of the inner container and the outer container, A flange is arranged on the head of the inner container, a flat cover is arranged on the flange, and a spherical head with a flange is arranged on the head of the outer container. 2. A vacuum multi-layer heat-insulated cryogenic container with a manhole structure as claimed in claim 1, characterized in that: a support tube is provided between the inner and outer container heads, and a support tube is provided between the support tube and the lower flange. Fiberglass support. 3. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure as claimed in claim 1, characterized in that: the bellows compensator is provided with an insulating layer. 4. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to claim 1, characterized in that: the flange is provided with a liquid level gauge support. 5. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to claim 1, characterized in that: the flat cover is provided with cable joints and handles. 6. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure as claimed in claim 1, characterized in that: a reinforcing tube is provided in the head of the outer container, and a reinforcing ring is provided on the outer surface. 7. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to claim 1, characterized in that: a bursting membrane is welded on the spherical head with a flange, and there are cable joints and handles. 8. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to claim 1, characterized in that an upper flange is provided on the head of the outer container. 9. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure as claimed in claim 1, wherein a lower flange is provided on the head of the inner container. 10. A vacuum multi-layer thermally insulated cryogenic container with a manhole structure according to claim 1, characterized in that: a reinforcing tube and a reinforcing ring are provided on the head of the outer container.

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