CN221831834U - A filter suitable for solid oxygen controlled lead-bismuth circuit - Google Patents

Abstract

The utility model discloses a filter suitable for a solid oxygen control lead bismuth loop in the technical field of nuclear power, which comprises a sleeve and a filter body. The top of the filter body is provided with a flange opening, the inner wall of the flange opening is connected with a sleeve through screw threads in a screwing mode, and the flange opening is provided with a screw hole and is connected with a sealing cover through a bolt; the sleeve is arranged inside the sealing cover and the body; the upper end of the sleeve is provided with a hexagonal screw hole so that the sleeve is separated from the body. The lower surface of the lower end of the sleeve is provided with a convex ring and the inner surface of the filter body to form a sealing ring structure; the inner surface of the lower end of the sleeve is connected with a filter element through screw threads in a screwing way; the filter element is arranged in a filter cavity below the sealing ring structure of the filter element and is used for filtering lead bismuth fluid to be filtered. The filter device provided by the utility model can take out the filter element for replacement after the internal filter element exceeds the use time limit, thereby reducing the use cost.

Description

A filter suitable for solid oxygen controlled lead-bismuth circuit

Technical Field

The utility model belongs to the technical field of nuclear power, and in particular relates to a fluid direct purification device suitable for a lead-bismuth circuit.

Background Art

Based on the development and needs of the fourth-generation nuclear reactor, the lead-based fast reactor with a low melting point has become one of the current research hotspots. Lead-bismuth eutectic alloy (LBE) has excellent characteristics such as low melting point, high boiling point, low activity, low viscosity, high thermal conductivity and good neutronic performance. The lead-cooled fast reactor is a new type of nuclear reactor that uses lead-bismuth eutectic alloy (LBE) as a coolant. It has been selected as one of the candidates for the fourth-generation new nuclear reactor due to its advantages such as high thermoelectric conversion efficiency and fast cooling rate. However, lead-bismuth alloy (LBE) is highly corrosive to steel directly exposed to it in medium and high temperature environments. In a non-isothermal loop, under a certain oxygen concentration, the structural materials in the high-temperature area corrode in the liquid lead-bismuth alloy (LBE) environment to produce PbO impurities, which can easily cause the microchannel heat exchanger to be blocked. Different oxygen concentrations will affect the corrosion of lead-bismuth alloy. At present, oxygen concentration is generally controlled by oxygen control technology, such as solid oxygen control, gaseous oxygen control, oxygen pump and other technologies to prevent its corrosion. However, in actual situations, local structural corrosion and solid oxide contamination are inevitable, leading to the generation of PbO impurities. In order to prevent the microchannel heat exchanger from being blocked, it is necessary to design a liquid lead-bismuth fluid purification device.

Utility Model Content

In view of the above problems, the present invention proposes a filter suitable for a solid oxygen-controlled lead-bismuth circuit. The filter can remove the filter element inside and replace it after the internal filter element exceeds the service life, thereby reducing the use cost.

Another object of the utility model is to provide a filter suitable for a solid oxygen-controlled lead-bismuth circuit to solve the technical problem in the prior art that the filter screen is damaged due to corrosion in the lead-bismuth alloy, thereby resulting in a decrease in filtering performance and an inability to filter out the target impurity particles PbO.

To achieve the above purpose, this new type of use adopts the following technical solutions:

A filter suitable for a solid oxygen-controlled lead-bismuth circuit, the filter comprising a sleeve and a filter body. A flange is provided at the top of the filter body, the inner wall of the flange is screwed with a sleeve through a thread, and a screw hole is provided at the flange to be connected to a cover through a bolt; the sleeve is provided inside the cover and the body; a hexagonal screw hole is provided at the upper end of the sleeve to separate the sleeve from the body. A convex ring is provided on the lower surface of the lower end of the sleeve to form a sealing ring structure with the inner surface of the filter body; a filter element is screwed with a filter element on the inner surface of the lower end of the sleeve through a thread; the filter element is provided in a filter cavity below its sealing ring structure, and the filter element is used to filter the lead-bismuth fluid to be filtered.

Preferably, a gasket is provided at the flange opening, and the sealing gasket fits tightly with the sealing cover.

Preferably, the convex ring on the lower surface of the lower end of the sleeve is concentric with the groove on the inner surface of the filter body to form a sealing ring structure.

Preferably, the filter element is provided with a thread, which is screwed together with the thread on the inner surface of the lower end of the sleeve. The screwed filter element is located in the filter cavity below the sealing ring structure, so that the impurity particles PbO are purified after passing through the filter element.

Preferably, the filter body is provided with a hanging basket frame to provide support for the filter body.

Preferably, the outer surface of the filter body is covered with heat-insulating cotton for heat preservation, and a heater is provided on the outer surface parallel to the filter cavity to prevent lead and bismuth from solidifying.

The beneficial effects of the filtering device provided by the present application are:

Compared with the prior art, the present filter not only avoids the degradation of filtering effect caused by corrosion of the filter by high-temperature lead-bismuth alloy during filtering, but also provides a filter structure that facilitates replacement of the filter element, thereby enabling quick replacement of the filter element and reducing costs.

By using a multi-layer metal sintered mesh filter element, the corrosion effect caused by the high-temperature lead-bismuth alloy is unlikely to make its filtering effect ineffective. At the same time, the detachable and cleanable filter element will increase its service life and further improve the reliability of the filter.

By removing the flange cover and the sleeve, the filter element installed at the lower end of the sleeve will be taken out together. Since the filter element and the sleeve are connected by threads, the removed filter element is easy to disassemble and separate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional appearance structure of the utility model.

FIG. 2 is a front view of the three-dimensional appearance structure of the utility model.

FIG3 is a schematic diagram of the cross-sectional structure of the utility model.

FIG. 4 is a top view of the sleeve and filter body of the present invention.

FIG5 is a schematic diagram of the three-dimensional appearance structure of the sleeve of the present invention.

FIG6 is an enlarged schematic diagram of the structure of the labyrinth seal ring of the present invention.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

The structure of a filter provided by the utility model is shown in Figures 1 and 3, including a filter body 1, various sensors 101, and a flange sealing gasket 103. The main flange sealing top cover 104 on the sealing gasket 103 is connected to the filter body 1 by bolts, and there is an air filling and exhaust port 105 on one side, a fluid inlet pipe 107 below it, and a fluid outlet pipe 108 at the bottom of the body.

As shown in Figures 3 and 6, the sleeve 2 is connected to the filter body 1 by screwing the thread 202 on the sleeve with the thread 102 on the body. A hole 203 is opened on the sleeve. The lower surface of the lower end of the sleeve has a convex ring 204, which forms a labyrinth sealing structure with the sealing ring groove 106 on the inner surface of the filter body. The inner side of the sleeve is screwed connected to the filter element 3 through a thread 205.

The fluid inlet pipe 107 is connected to the cold end of the lead loop by welding, and the fluid outlet pipe is connected to the pipeline before the lead loop pump by welding.

The outer surface of the filter body 1 is covered with heat insulation cotton for heat preservation, and a heater is arranged on the outer surface parallel to the filter cavity to prevent lead and bismuth from solidifying.

When in use, first screw the filter element 3 under the sleeve 2 through the thread 205, remove the main flange sealing top cover 104 after connection, extend the sleeve 2 into the filter body 1 from the flange mouth, and rotate the sleeve 2 to screw and connect through the threads 102 and 202. At the same time, the convex ring 204 at the lower end of the sleeve is engaged with the sealing ring groove 106, so that the connection is tightly sealed and the filter bypass flow is reduced, so that the lead-bismuth fluid to be filtered can fully pass through the filter element 3, thereby improving the filtering performance of the filter.

Working principle: The lead-bismuth fluid to be filtered enters the filter body 1 through the fluid inlet pipe 107, a part of the lead-bismuth fluid enters the upper expansion chamber so that the liquid level can be measured and adjusted through various sensors 101 and the inflation and exhaust ports 105, and the other part flows downward through the filter element 3 through the hole 203, so that the PbO impurity particles are filtered out.

It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims (6)

1. A filter suitable for a solid oxygen control lead bismuth loop, which is characterized by comprising a sleeve and a filter body; the top of the filter body is provided with a flange opening, the inner wall of the flange opening is connected with a sleeve through screw threads in a screwing mode, and the flange opening is provided with a screw hole and is connected with a sealing cover through a bolt; the sleeve is arranged inside the sealing cover and the body; the upper end of the sleeve is provided with a hexagonal screw hole so as to separate the sleeve from the body; the lower surface of the lower end of the sleeve is provided with a convex ring and the inner surface of the filter body to form a sealing ring structure; the inner surface of the lower end of the sleeve is connected with a filter element through screw threads in a screwing way; the filter element is arranged in a filter cavity below the sealing ring structure of the filter element and is used for filtering lead bismuth fluid to be filtered.

2. A filter suitable for use in a solid state oxygen controlled lead bismuth circuit as claimed in claim 1, wherein: the flange opening is provided with a gasket, and the sealing gasket is tightly attached to the sealing cover.

3. A filter suitable for use in a solid state oxygen controlled lead bismuth circuit as claimed in claim 1, wherein: the convex ring on the lower surface of the lower end of the sleeve is concentric with the groove on the inner surface of the filter body and forms a sealing ring structure.

4. A filter suitable for use in a solid state oxygen controlled lead bismuth circuit as claimed in claim 3 wherein: the filter element is provided with threads, and the threads are screwed with the inner surface of the lower end of the sleeve, so that the screwed filter element is positioned in the filter cavity below the sealing ring structure.

5. A filter suitable for use in a solid state oxygen controlled lead bismuth circuit as claimed in claim 1, wherein: the filter body is provided with a basket support.

6. A filter suitable for use in a solid state oxygen controlled lead bismuth circuit as claimed in claim 1, wherein: the outer surface of the filter body is coated with heat insulation cotton for heat preservation, and a heater is arranged on the outer surface of the parallel position of the filter cavity for preventing lead bismuth from solidifying.