WO2008071084A1

WO2008071084A1 - Combined sleeve seal

Info

Publication number: WO2008071084A1
Application number: PCT/CN2007/003531
Authority: WO
Inventors: Caiyun Li
Original assignee: Caiyun Li
Priority date: 2006-12-12
Filing date: 2007-12-11
Publication date: 2008-06-19
Also published as: CN201202812Y; CN101038035A

Abstract

A combined sleeve seal includes a sleeve (4) disposed to enclose a surface being sealed, and a torque spring packing element (3) disposed to enclose another surface of the sleeve (4). The torque spring packing element (3) can be radial deformed by the torque impressed by a packing sleeve (5), and the sleeve (4) is a radially deformable element radially deformed with the radial deformation of the torque spring packing element (3). The sleeve (4) seals the axial end surface by a packing apparatus and the packing sleeve (5). The seal can not only dissolve the problem of uneven radial pressure of packing seal but also further improve the seal performance by regulating radial seal pressure or clearance.

Description

Sleeve type combined sealing element

The utility model belongs to the technical field of packing sealing. Background technique

In the traditional sense, packing seals are seals made of a soft material such as hemp, leather, asbestos, expanded graphite, etc., which block the sealed shaft and the stuffing box, or the gap between the shell hole and the rod to prevent the medium from leaking. However, due to the softness of the packing sealing material and the poor compactness, the radial sealing pressure is uneven due to the axial pressing, which affects the sealing effect and sealing ability. The coaxial seals such as the Glyd Ring and the Sterling Seal have reliable performance and remarkable effects, but there are also inconveniences in adjusting the radial sealing pressure. Summary of the invention

The purpose of the invention is to use a sealing material with higher strength, higher hardness, more pressure resistance, wear resistance, medium resistance, heat resistance and better self-sliding performance (for example: engineering plastics such as reinforced modified PTFE and Its alloys, various impregnating materials of graphite, various alloys, etc., combined with existing sealing technology, provide a sleeve type combined sealing element, which not only solves the problem of uneven radial pressure of the packing seal, but also can pass Adjusting the radial seal pressure or the radial seal gap further improves the sealing ability of the sealing member, while maintaining the radial seal at an optimum while the axial end face is statically sealed without leakage.

To achieve the above object, the technical solution of the present invention is described below with reference to the accompanying drawings:

A sleeve type combined sealing element, which is mainly composed of a torsion spring type force applying element 3 and a sleeve member 4, the sleeve member 4 is fitted on a sealed surface, and the torsion spring type force applying member 3 Mounted on the other side of the sleeve member 4, the torsion spring type force-applying member 3 can be radially displaced by applying a torque, the sleeve member 4 is a radially deformable member, and the torsion spring-type force-applying member 3 Radial deformation occurs radially to perform radial sealing, while axial compression is applied to perform axial end face static sealing.

The invention belongs to the technical field of packing sealing, and the above-mentioned sleeve type sealing element should be assembled in a compression sleeve in a packing sealing device having a pressing mechanism and a pressing sleeve. The above-mentioned torsion spring type urging member is passed through a pressing mechanism (the internal thread pressing cover 8 shown in Figs. 2 and 3 and the lock nut 10 shown in Fig. 4) and the torque transmitting sleeve 5 3 The torque is applied, and the above-mentioned sleeve member 4 is also statically sealed by the axial end face by the pressing mechanism and the torque-carrying compression sleeve 5. The sleeve member 4 of the sleeve-type combination sealing member can be fitted and sealed with other sealing members.

The invention can not only solve the problem of uneven radial pressure of the packing seal, but also further improve the sealing ability of the sealing element by adjusting the radial sealing pressure or the radial sealing gap, and is capable of achieving the radial sealing in an optimal state, the axial direction. Multi-functional, comprehensive combination sealing technology with no static leakage on the end face. By using the sealing member of the present invention, a series of products can be produced, and new products such as oil cylinders, plungers, plunger pumps, and various pipe joints can be developed. DRAWINGS

1 is a structural schematic view of the torsion spring type force-applying member 3 and the sleeve member 4 of the present invention; FIG. 2 is a schematic structural view of the rotary shaft seal;

Figure 3 is a schematic structural view of a reciprocating shaft seal;

Figure 4 is a schematic structural view of a reciprocating hole seal; Figure 5 is a schematic structural view of another rotary shaft seal.

In the figure: 1. Sealed shaft 1-1. Rod 2. Housing 2-1. Cylinder 3. Torsion spring type force-applying element 4. Sleeve part 5. Compression sleeve 6. Fixing sleeve 7. Coaxial seal Ring (the shaft seal is called the seal, as shown in Figure 3; when the hole seal is called the check ring, as shown in Figure 4) 8. The internal thread press cover 9. Type 0 seal 10. Lock nut 11. Groove for dust seals 12. Cooling or lubricating holes 13. Positioning sleeve

14. if into the torque hole

The invention has a wide range of uses, and only four specific embodiments are proposed for the length of the text.

1. The sealing of the rotating shaft (see Figure 2), mostly used for the sealing of the valve stem and the reactor shaft;

2. Sealing of the reciprocating shaft (see Figure 3);

3. Sealing of the reciprocating hole (see Figure 4);

4. The schematic structure diagram of another rotary shaft seal (see Figure 5).

The invention mainly utilizes the characteristic that the torsion spring is contracted when the torque is subjected to the torque (when it is in the same direction as the spring spiral) or the expansion (when it is reversely twisted with the spring), and the torsion spring is similar to the torsion spring. The urging element 3 is combined with a sleeve member 4 that is combined in the torsion spring type urging element 3 (for shaft sealing) or outer (for hole sealing).

The torsion spring type force-applying member 3 is preferably a rectangular or trapezoidal spring wire, and the both ends are designed to have a concave or convex structure with an inner arm, a radially outer arm and/or an axial outer arm. The torsion spring type force-applying element 3 for shaft sealing should have a certain gap to compensate for the axial length increment of the torsion spring type force-applying element when the shrinkage deformation occurs. a sleeve member 4 combined in or outside the torsion spring type force-applying member 3, which is compounded or combined from one or more materials, and is designed to have a gap between the sealed shaft 1 or the hole. Tube. The sleeve member adopts a sealing material or a sealing material which is most suitable for the sealing, and has a high hardness, a large modulus of elasticity and a large modulus of elasticity according to the sealing condition. Made of a material large enough to withstand a larger axial load and a radially deformable structure (such as a structure with a uniform axial groove, an evenly distributed flap, an evenly distributed partial port, etc.) Compound or combined. The sleeve member 4 may be cylindrical, corrugated, drum-shaped, saddle-shaped, etc., or have a radial sealing surface structure that can be combined with other sealing members, and has a flat surface, a conical surface, a circular arc surface, a B shape A face, a concave face, or an axially statically sealed end face in which the front faces are combined with each other, or other structure that can be matched with existing seals.

When the sealing is performed by the sleeve type combined sealing member, the order of the fixing sleeve 6, the sleeve type combined sealing member, the torque transmitting pressing sleeve 5, and the pressing mechanism (according to the sealing from the side of the medium to be sealed) It is necessary to assemble the compression sleeve and the fixed sleeve with a transferable torque in the sealing device for the shaft or the hole. Both the fixing sleeve 6 and the torque transmitting compression sleeve 5 have an axial static sealing end face structure matched with the sleeve member 4 and a torque transmitting structure matched with the arms of the torsion spring type force applying member 3, the pressure The sleeve 6 also has a structure for transmitting a concave groove, a hole, and the like, and the arms of the torsion spring type force-applying member 3 are respectively fixed or clamped in the fixing sleeve 6 and the compression sleeve 5 into which the torque can be input.

During commissioning, the torque required to seal the required direction of rotation is first input to the compression sleeve 6 that transmits the torque, and is forced into the torsion spring type force-energizing element 3 by the radial pressure generated by the torsion spring type force-applying element 3 ( When the shaft is sealed (or when the hole is sealed), the sleeve member 4 is diametrically deformed (for shaft sealing) or expanded (for hole sealing) to adjust the radial pressure contact seal or radial direction of the seal. The gap non-contact seal firstly seals the radial seal in an optimal state, and while maintaining this optimum condition, the pressing mechanism ensures that the axial end face is statically sealed without leakage, and finally the optimal sealing state is locked. In addition, measures such as running-in, cooling or lubrication are adopted to further improve the sealing ability.

In the present invention, the torsion spring type urging member 3 assembled in or outside the sleeve member is only subjected to radial pressure and load, and is not subjected to axial load.

The fixing sleeve 5 can be integrated with the support member of the sealed shaft 1 when the shaft is sealed, and can be fixed by welding, bonding, interference assembly or screw sealing according to the sealing requirement; and can be sealed with the hole when the hole is sealed. (The rod, such as the piston rod) is integrated and can be fixed to the rod by pins and 'screws, and withstand the torque from the torsion spring type force-applying element 3. The sleeve member 4 incorporated in or out of the torsion spring type force-applying member 3 of the present invention is a core member of the present invention, which is a seal member and a carrier for other seal members combined therewith, having positioning, guiding, etc. Features.

Claims

Claim

A sleeve type combined sealing member, characterized in that it is mainly composed of a torsion spring type force applying member (3) and a sleeve member (4), and the sleeve member (4) is set on a sealed surface. The torsion spring type force component (3) is sleeved on the other side of the sleeve member (4), and the torsion spring type force component (3) can be radially displaced by applying a torque, the sleeve member (4) It is a radially deformable element, and is radially deformed to perform radial sealing as the torsion spring type force transmitting element (3) is radially displaced, while applying an axial pressing force to perform axial end face static sealing.

2. A telescopic combination sealing element according to claim 1 wherein said sleeve member (4) is mated with other seals.