CN210034398U - Nuclear power equipment and efficient mechanical sealing device with boss connecting pipe - Google Patents

Abstract

The utility model provides a high-efficiency mechanical sealing device with a boss connecting pipe, which comprises a plurality of double-claw type clamps and sealing glands; the double-claw type hoop comprises a front claw piece, a rear claw piece and a fastener for connecting the front claw piece and the rear claw piece; the front flange of the front claw piece corresponds to the peripheral platform of the sealing gland, and the rear flange of the rear claw piece corresponds to the boss of the connecting pipe; a sealing ring is embedded in the sealing surface of the sealing gland; a plurality of two claw formula clamps encircle the boss interval setting of sealing gland and takeover, and the preceding flange of preceding claw spare and the back flange of back claw spare are pressed from both sides periphery platform and boss wherein, and the fastener is screwed up respectively so that the fastener applys the effort at sealing gland's periphery platform, and the rethread sealing gland transmits to the sealing washer, extrudes its deformation, realizes the mouth of pipe sealing of takeover. The utility model also provides a nuclear power equipment including this high-efficient mechanical seal device. The high-efficiency mechanical sealing device can be simply and conveniently sealed by using standard parts.

Description

Nuclear power equipment and efficient mechanical sealing device with boss connecting pipe

Technical Field

The utility model relates to a nuclear power equipment, in particular to a high-efficient mechanical seal device for taking boss to take over.

Background

For finished nuclear power equipment, nitrogen is required to be filled into an inner cavity of the equipment in the storage and transportation processes, and low-pressure (gauge pressure is generally lower than 1 atmosphere) protection is carried out to prevent parts of the inner cavity from being corroded. The sealing is usually carried out by welding a connecting pipe cover, but the sealing mode is not easy to disassemble, is not advisable in some cases, and is not agreed by a user or/and a design party of equipment sometimes, so that a non-welded connecting pipe mechanical sealing mode is needed.

The common non-welded connecting pipe mechanical seal is complex in general structure, the types and the number of the related parts are large, and the installation and the disassembly also need long time.

Patent application publication No. CN104197013A discloses such mechanical sealing structure for connecting pipe, wherein the mechanical sealing structure for small connecting pipe comprises a bolt, a self-tightening assembly, a port sealing assembly and a nut. When sealing is carried out, the bolt is vertically inverted, so that the bolt head is positioned below, and the threaded end is positioned above; sleeving a first gasket, a rubber gasket and a pressing ring on the bolt in sequence, and placing the bolt into the small adapter in a free state; a thin rope is inserted into a transverse through hole at the end part of the threaded end of the bolt and tied; the second gasket is arranged in the groove of the interface cover, faces the port of the small connecting pipe, and is sleeved on the bolt, so that the lower surface of the second gasket is in contact with the top surface of the port of the small connecting pipe; screwing a nut on the bolt to enable the bolt to be in contact with the upper surface of the interface cover, so that the second gasket is always in contact with the top surface of the port of the small connecting pipe; continuously screwing the nut, so that the second gasket is respectively contacted with the top surface of the port of the small connecting pipe and the interface cover and bears pressing force, and the port of the small connecting pipe is sealed; meanwhile, the pressing force is transmitted to the pressing ring from the interface cover, so that the rubber gasket continuously bears the pressing force between the pressing ring and the first gasket and generates expansion deformation until the deformed rubber gasket is contacted with the inner wall of the small connecting pipe and generates friction self-tightening force, and a fastening stress area of the whole sealing structure acts on the inner wall of the small connecting pipe. Which has the aforementioned problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a mechanical seal structure suitable for take boss to take over can use standard component simply conveniently to seal the operation.

The utility model provides a high-efficiency mechanical sealing device with a boss connecting pipe, which comprises a plurality of double-claw type clamps and sealing glands; the double-claw type hoop comprises a front claw piece, a rear claw piece and a fastener for connecting the front claw piece and the rear claw piece; the front claw piece is provided with a front flange, the rear claw piece is also provided with a rear flange, the front flange of the front claw piece corresponds to the peripheral platform of the sealing gland, and the rear flange of the rear claw piece corresponds to the boss of the adapter tube; the sealing gland is provided with a sealing surface opposite to the end face of the connecting pipe, and a sealing ring is embedded in the sealing surface; the high-efficient mechanical seal device's operating condition, a plurality of double-jaw formula clamps encircle the boss interval setting of gland and takeover, preceding flange of preceding claw with the back flange of back claw will periphery platform with the boss presss from both sides wherein, the fastener is screwed up respectively so that the effort is applyed to the fastener is in gland the periphery platform, the rethread gland transmits to the sealing washer extrudes its deformation, realizes the mouth of pipe sealing of takeover.

In one embodiment, the gland has a front end face and a rear end face, the rear end face having the sealing face disposed thereon.

In one embodiment, the sealing gland has a front end face and a rear end face, the center of the rear end face is provided with a convex column corresponding to the shape of the pipe orifice, the outer peripheral surface of the convex column is provided with the sealing surface, and the plane of the rear end face surrounding the convex column is provided with a rubber gasket for contacting with the end face of the connecting pipe.

In one embodiment, the sealing gland has a front end face and a rear end face, the rear end face has a convex ring on its outer periphery, the sealing surface is provided on the inner peripheral surface of the convex ring, and a rubber gasket for contacting the nipple end face of the nipple is provided on the plane of the rear end face surrounded by the convex ring.

In one embodiment, the front end face has a catch groove corresponding to the plurality of double claw clips, and the front flange of the front claw member has a catch claw fitted into the catch groove.

In one embodiment, a handle is provided at the center of the front end face.

In one embodiment, the gland is provided with an external connection interface.

In one embodiment, the fasteners are band bolts, and the distance from the end surface of the threaded head of each band bolt to the end surface of the rear jaw is equal.

The utility model provides a nuclear power equipment has equipment inner chamber and takeover, the takeover has the boss, the mouth of pipe of takeover is sealed through foretell high-efficient mechanical seal device.

In one embodiment, the boss has an outer diameter of 50mm to 100 mm.

The high-efficiency mechanical sealing device uses the combination of the sealing ring and the sealing gland and is matched with the standard component of the double-claw type hoop to mechanically seal the connecting pipe with the boss, the operation is simple and convenient, the disassembly and the assembly are easy to carry out, and the required time for the disassembly and the assembly is short.

The efficient mechanical sealing device is simple in structure, small in part quantity, low in part purchasing and processing cost and short in period.

The high-efficiency mechanical sealing device has ideal sealing performance and good sealing effect, and is particularly suitable for medium-sized and small-sized connecting pipes with bosses used in nuclear power equipment, for example, connecting pipes with boss outer diameters smaller than 100mm, particularly connecting pipes with boss diameters of 50mm to 100mm under low-pressure working conditions.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of a high-efficiency mechanical seal device according to a first embodiment.

Fig. 2 is a schematic structural view of a high-efficiency mechanical seal device according to a second embodiment.

Fig. 3 is a schematic structural view of a high-efficiency mechanical seal device according to a third embodiment.

Detailed Description

The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth more details for the purpose of providing a thorough understanding of the present invention, but it is obvious that the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations and deductions based on the practical application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of the detailed description.

For example, a first feature described later in the specification may be formed over or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated in the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

It should be noted that these and other figures are given by way of example only and are not drawn to scale, and should not be construed as limiting the scope of the invention as it is actually claimed. Further, the conversion methods in the different embodiments may be appropriately combined.

First embodiment

Fig. 1 shows a high-efficiency mechanical seal device 10 with a boss nozzle 20 according to a first embodiment in an operating state. For convenience of description, spatial relational terms such as "front", "rear", and the like are introduced to describe the relationship between the features, and in fig. 1 and later fig. 2 and 3, the left side is "front", and the right side is "rear". The adapter 20 with the boss is shown in fig. 1, the adapter 20 has a nozzle 203, the nozzle 203 has a boss 201, that is, when the boss 201 is a cylindrical boss, the outer diameter Φ 2 of the boss 201 at the nozzle 203 of the adapter 20 is larger than the outer diameter of the adapter body 200. In another embodiment, the boss 201 may also be a square pillar or other shaped boss. The adapter 20 with the boss is particularly common in nuclear power equipment with an equipment inner cavity. In nuclear power plants, typically, the outer diameter Φ 2 of the boss 201 of the nozzle 20 is 50mm to 100 mm. The utility model provides a high-efficient mechanical seal device 10 specially adapted seals this kind of mouth of pipe 203 of taking boss to take over 20, and this mechanical seal structure can be used for the takeover when equipment storage, transportation sealed, and also can be used for the takeover when equipment hydrostatic test or atmospheric pressure test under the low pressure operating mode sealed.

The high efficiency mechanical seal 10 includes a plurality of double jaw clamps 1 and a gland 2. In the cross-section shown in fig. 1, only two double claw clips 1 are shown. In practical implementation, three or four or more than five double-claw clips 1 may be arranged uniformly along the circumference of the adapter 20 (or the boss 201), for example, as required.

The double jaw clamp 1, which may also be referred to as a double jaw caliper, is a standard component. The dual jaw clamp 1 generally includes a front jaw member 11 (or upper clamp), a rear jaw member 12 (or lower clamp), and a fastener 13, the fastener 13 connecting the front jaw member 11 and the rear jaw member 12.

The front jaw member 11 has a front flange 111 and the rear jaw member 12 also has a rear flange 121. The front flange 111 of the front jaw 11 corresponds to the peripheral plateau 21 of the gland 2. The rear flange 121 of the rear jaw 12 corresponds to the boss 201 of the adapter 20.

The gland 2 has a sealing surface 22 opposite the nipple end face 202 of the nipple 20. The sealing surface 22 of the gland 2 may be embedded with a sealing ring 3. For example, a sealing groove capable of embedding an O-shaped sealing ring is arranged on the sealing gland 2, and the selection of the O-shaped sealing ring and the size of the corresponding sealing groove on the sealing gland 2 can adopt corresponding sizes and structural forms on GB/T3452.1 and GB/T3452.3.

In the operational state of the high efficiency mechanical seal 10 as shown in fig. 1, a plurality of double jaw clamps 1 are spaced around the gland 2 and the boss 201 of the adapter 20. The front flange 111 of the front jaw 11 and the rear flange 121 of the rear jaw 12 sandwich the outer peripheral platform 21 and the boss 201 of the gland 2.

The fastening pieces 13 of the double-jaw type clamp 1 are respectively screwed so that the fastening pieces 13 apply acting force on the peripheral platform 21 of the sealing gland 2, and then the acting force is transmitted to the sealing ring 3 through the sealing gland 2 to extrude the deformation of the sealing ring, so that the pipe orifice sealing of the connecting pipe 20 is realized. For example, the front claw member 11 and the rear claw member 12 each have a threaded hole through which the fastening member 13 is inserted, and the fastening member 13 may be inserted through the gasket 5 and then respectively inserted through the threaded holes of the front claw member 11 and the rear claw member 12. By tightening the fasteners 13 of the dual jaw clamp 1, the front jaw member 11 and the rear jaw member 12 may be brought closer together such that the front flange 111 of the front jaw member 11 and the rear flange 121 of the rear jaw member 12 clamp the peripheral platform 21 of the gland 2 to the boss 201.

In fig. 1, the fastening members 13 are band bolts, and the distance L from the head end surface 131 of each band bolt as the fastening member 13 to the rear jaw end surface 122 of the rear jaw 12 may be equal, thereby ensuring uniform application of force. Through fastening each clamp bolt that the equipartition set up on the takeover outer wall, comparatively even effort is exerted to the sealing washer 3 of embedding gland 2, extrudees its deformation in order to reach sealed effect.

The gland 2 has a front end face 23 and a rear end face 24, the rear end face 24 being provided with a sealing face 22.

In fig. 1, the front end surface 23 of the gland 2 further has a plurality of engaging grooves 231 corresponding to the plurality of double-jaw clamps 1. The front flange 111 of the front jaw member 11 of the double jaw clamp 1 has a jaw 112, and the jaw 112 can be inserted into the slot 231. The clamping groove 231 may be a whole annular groove, or may be an intermittent annular groove or a square groove according to actual requirements.

The center of the front end surface 23 of the gland 2 can be provided with a handle 4, which is convenient for holding the gland 2. For example, as shown in fig. 1, the handle 4 is an eye screw, and is screwed into the center of the front end surface 23 of the gland 2, and the eye screw can be (unscrewed) removed after the gland 2 is mounted.

The sealing gland 2 can be provided with an external connection interface such as a threaded interface and the like according to actual needs, so that a meter and the like can be arranged, for example, the pressure of an inner cavity of the equipment can be detected and the like. The external connection interface may be provided, for example, in the center of the gland 2, and in this case, the handle 4 may be provided at another portion of the gland 2.

Second embodiment

A second embodiment will be described with reference to fig. 2, which follows the element numbers and parts of the contents of the first embodiment, wherein the same reference numbers are used to denote the same or similar elements, and the description of the same technical contents is optionally omitted. For the description of the omitted parts, reference may be made to the first embodiment, and the description of the second embodiment will not be repeated.

The high-efficiency mechanical seal device 10 according to the first embodiment is suitable for a case where the width W of the seal end surface (or, the nipple end surface 202) of the nipple 20 is sufficient to provide the seal ring.

Whereas the high-efficiency mechanical seal device 10 according to the second embodiment is suitable for the following cases: the width W of the connecting tube end face 202 of the connecting tube 20 is too narrow, as shown in fig. 2, a groove 204 is formed at the connecting tube end face 202, the width W of the truncated edge forming the connecting tube end face 202 is too small, but the size of the inner diameter Φ 1 of the tube mouth 203 of the connecting tube 20 is not small, and the requirement for arranging a sealing ring can be met.

In the second embodiment, the difference from the first embodiment is in the configuration of the gland 2. The sealing gland 2 is provided with a front end surface 23 and a rear end surface 24, the center of the rear end surface 24 is provided with a convex column 241 corresponding to the shape of the pipe mouth 203, the peripheral surface 242 of the convex column 241 is provided with a sealing surface, and the sealing surface is embedded with a sealing ring 3. The flat 240 of the rear end face 24 surrounding the boss 241 is provided with a rubber gasket 6 for contacting the nozzle end face 202 of the nozzle 20. The rubber gasket 6 can isolate the sealing gland 2 and the adapter 20 from the blunt edge of the outer groove (i.e., the adapter end face 202), so as to avoid scratching the adapter end face 202 of the adapter 20 and possible adapter material pollution caused by direct contact between the sealing gland 2 and the adapter end face 202 of the adapter 20.

Third embodiment

A third embodiment will be described with reference to fig. 3, which follows the element numbers and parts of the contents of the first embodiment, wherein the same reference numbers are used to denote the same or similar elements, and the description of the same technical contents is optionally omitted. For the description of the omitted parts, reference may be made to the first embodiment, and the description of the third embodiment is not repeated.

The high-efficiency mechanical seal device 10 according to the third embodiment is suitable for the following cases: the width W of the connecting pipe end face 202 of the connecting pipe 20 is too narrow, as shown in fig. 3, a groove 204 is formed at the connecting pipe end face 202, the width W of the truncated edge forming the connecting pipe end face 202 is too small, but the size of the outer diameter Φ 2 of the boss 201 of the connecting pipe 20 is not large, so that the requirement of arranging a sealing ring can be met.

In the third embodiment, the constitution of the gland 2 is different from that in the foregoing embodiments. The gland 2 has a front end face 23 and a rear end face 24, the periphery of the rear end face 24 having a raised ring 244. The inner peripheral surface 245 of the male ring 244 is provided with a sealing surface in which the seal ring 3 is embedded. The flat surface 249 of the rear end face 24, which is surrounded by the collar 244, is provided with a rubber gasket 6 for contacting the nozzle end face 202 of the nozzle 20.

Illustratively, the high efficiency mechanical seal 10 may operate as follows:

1) the cleaning of the inner and outer surfaces of the adapter tube 20 is completed and the efficient mechanical seal device 10 is ready to be installed.

2) The sealing gland 2 and the handle 4 are firstly installed, and the sealing ring 3 is installed. For example, the rubber gasket 6 is glued to the sealing gland 2 at a corresponding location, in which the rubber gasket 6 is provided.

3) Seal gland 2 is fixed well through handle 4, sets up a plurality of double-jaw formula clamps 1 according to the demand equipartition to twist each fastener 13 in proper order. When the front flange 111 of the front jaw 11 contacts the front surface 23 of the gland 2 and the rear flange 121 of the rear jaw 12 also contacts the outer bottom surface of the boss 201 of the adapter, the tightening of the fastener 13 is stopped, and the loosening of one fastener 13 is started until all the clips 1 are tightened to the above state.

4) The fasteners 13 are screwed in turn, the number of turns per screwing is as small as possible (one fastener cannot be screwed down after being screwed in place), so that the pressing force applied to the sealing ring 3 is uniform, namely, the distance L from the end face of the thread head of each fastener 13 to the end face of the rear claw member 12 is equal. Finally, the fastener 13 is tightened until the required preload force for sealing is reached.

The order of disassembly of the high efficiency mechanical seal 10 is reversed from the installation order described above.

The high-efficiency mechanical sealing device is strong in structural universality, and can flexibly select the clamp with a proper size according to the appearance structure and the diameter size of the connecting pipe boss and the pressure maintaining pressure of equipment so as to provide enough pretightening force. For different widths of the sealing end face of the connecting pipe and the sizes of the inner diameter and the outer diameter of the boss of the connecting pipe, sealing can be realized by adjusting the structure of the sealing gland and correspondingly adjusting other related sizes.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. A high-efficiency mechanical sealing device with a boss connecting pipe is characterized by comprising a plurality of double-claw type hoops and sealing glands;

the double-claw type hoop comprises a front claw piece, a rear claw piece and a fastener for connecting the front claw piece and the rear claw piece;

the front claw piece is provided with a front flange, the rear claw piece is also provided with a rear flange, the front flange of the front claw piece corresponds to the peripheral platform of the sealing gland, and the rear flange of the rear claw piece corresponds to the boss of the adapter tube;

the sealing gland is provided with a sealing surface opposite to the end face of the connecting pipe, and a sealing ring is embedded in the sealing surface;

the high-efficient mechanical seal device's operating condition, a plurality of double-jaw formula clamps encircle the boss interval setting of gland and takeover, preceding flange of preceding claw with the back flange of back claw will periphery platform with the boss presss from both sides wherein, the fastener is screwed up respectively so that the effort is applyed to the fastener is in gland the periphery platform, the rethread gland transmits to the sealing washer extrudes its deformation, realizes the mouth of pipe sealing of takeover.

2. A high efficiency mechanical seal according to claim 1 wherein said gland has a front face and a rear face, said rear face having said seal face disposed thereon.

3. A high efficiency mechanical seal device as claimed in claim 1 wherein said gland has a front end face and a rear end face, said rear end face having a boss at its center corresponding to the shape of the nozzle, said seal surface being provided on the outer peripheral surface of said boss, and a rubber gasket for contacting the nozzle end face of the nozzle being provided on the plane of said rear end face surrounding said boss.

4. A high efficiency mechanical seal according to claim 1 wherein said gland has a front end face and a rear end face, said rear end face having a peripheral flange, said flange having said sealing surface on an inner peripheral surface thereof, said rear end face having a rubber gasket disposed on a plane surrounded by said flange for contacting the nipple end face of the nipple.

5. A high efficiency mechanical seal according to any one of claims 2 to 4 wherein said front end face has a catch groove corresponding to said plurality of double jaw clips, said front flange of said front jaw member having a catch, said catch engaging said catch groove.

6. A high efficiency mechanical seal according to any one of claims 2 to 4 wherein a handle is provided centrally of said front face.

7. A high efficiency mechanical seal according to claim 1 wherein said gland is provided with an external connection interface.

8. A high efficiency mechanical seal according to claim 1 wherein said fasteners are clamp bolts, the distance from the end surface of the threaded head of each clamp bolt to the end surface of the rear jaw member being equal.

9. A nuclear power plant having a plant interior and a nozzle with a boss, wherein the nozzle of the nozzle is sealed by a high efficiency mechanical seal as claimed in any one of claims 1 to 8.

10. The nuclear power plant as recited in claim 9 wherein the boss has an outer diameter of 50mm to 100 mm.

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