JPS60159298A - Seal packing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to seal packings, such as shield tunneling machine glue seals or tail seals used in tunnel construction.

Technology at the end of the page Generally, in tunnel construction using the shield method, as shown in Figure 1, a rotatable cutter disk 1 is installed at the tip.
A shield tunneling machine is used, and a lip seal 5 is interposed between the shield body 3 and the cylindrical support part 2 of the cutter disk 1 to prevent muddy water from entering the hole through the gap 4. ing.

By the way, this type of glue tube seal is used in the worst possible environment, such as muddy water, and the gas sheet cover excavator is used buried in the ground during the tunnel opening process, so it has less wear over a long period of time. There is a demand for something with excellent durability. The current Noritsubu seal is 3Kg/cm2
It can only withstand muddy water pressure of about
(Although it is required to excavate to a depth of about 100 m, there is currently no lip seal that can withstand the mud water pressure of about 10 Kg/cII+2.

On the other hand, the durability of a lip seal is usually referred to as its Pv value.

This is the value obtained by multiplying the surface pressure P applied to the lip tip by the circumferential speed ■ of the lip tip. The lower the PV value used, the more durable it is, or the deeper it is from the ground surface, the lower the surface pressure P.
has become so high that the current glue of 7 psi cannot withstand it. It may be possible to reduce the circumferential speed (■), but this would greatly extend the excavation period and is not practical.

Furthermore, the tail seal that seals the gap between the shielded shield body and the segment is also required to withstand a mud water pressure of approximately 10 kg/cIO', but no tail seal currently exists that satisfies this requirement.

Therefore, even if the hydraulic pressure acting on the seal tip increases, the surface pressure P applied to the seal tip does not increase, or if the surface pressure P applied to the seal tip increases only slightly, the PV Focusing on the ability to maintain the same level of pressure as current products, we aim to provide a seal packing with excellent pressure resistance.

Structure of the Invention - Compatible Button In order to achieve the above object, the seal puffkin according to the present invention has a seal that extends from the seal base fixed to the outer peripheral surface of the inner cylinder body or the inner peripheral surface of the outer cylinder body in the direction of hydraulic pressure action. A sliding part that stands up at an angle and whose tip presses against the inner circumferential surface of the outer cylinder or the outer circumferential surface of the inner cylinder, and acts to reduce the surface pressure at the tip of the sliding part by the action of hydraulic pressure. A pressure receiving surface is provided.

That is, according to the present invention, even if hydraulic pressure acts on the sliding portion and surface pressure P is generated at the tip of the sliding portion, this surface pressure P is reduced by the hydraulic pressure acting on the pressure-receiving surface, and as a result, As a result, the surface pressure P can be kept low, and accordingly, a lower PV value can be obtained than in the conventional one, and a seal packing with excellent durability can be obtained.

On the other hand, if the hydraulic pressure is the same as before, it can be used satisfactorily even if the circumferential speed (2) is increased.

Below, an embodiment in which the seal packing according to the present invention is applied to a lip seal will be described with reference to FIG. 2 and subsequent figures. In addition,
All of the examples described below are used for the number of shield excavations.

FIG. 2 shows the first embodiment, and the lip seal 10 consists of an annular seal base 11, a lip (sliding part) 12, and a connecting part 13, and is made of a wear-resistant rubber material. It is something. The lip 12 has a convex portion for reinforcing rigidity on its back surface, and stands upright at an angle toward the direction in which the mud water pressure Pro acts from the seal base 11. The connecting portion 13 connects the seal base 11 and the lip 12 and is formed at the front where the mud water pressure Pm acts, and the chamber 14 is formed in the shape e. has been done. Also, near the root of the lip 12 there is a chamber 1.t.
An air hole J6 is formed to communicate between the connecting portion 13 and the interior of the machine.
A recess 15 is formed in the shape rtL. These four parts 15 promote the flexibility of the connecting part 13, and the air holes 16 help the connecting part 13 to deform inwardly by releasing the pressure in the chamber 14. In the lip seal 10 having the following two configurations, the seal base 11 is fixed to the outer peripheral surface of the cylindrical support part 2 of the cutter disk, and the tip of the lip 12 is pressed against the inner peripheral surface of the shield body 3.

Here, when the mud water pressure Pm acts, a surface pressure P1 acts on the pressure receiving surface A of the lip 12, and a surface pressure P acts on the pressure receiving surface B of the connecting portion 13, respectively. At this time, the surface pressure P1 generates a component force that presses the tip of the lip 12 against the inner peripheral surface of the shield body 3,
The surface pressure P2 generates a component force that rotates the lip 12 in the counterclockwise direction in FIG. 2 using the root portion 17 as a fulcrum. Therefore,
The surface pressure P3 acting on the tip of the lip 12 is: P3 = P2X pressure receiving area - P2X pressure receiving area ... (
1) Note that Pan = P. = P2.

That is, in the past, the mud water pressure PII + the surface pressure P3 at the tip of the mud tube 12 acted as the surface pressure P3, but according to the present invention, it is reduced by P2X pressure receiving area, and the PV value can be used in a low state. The surface pressure P3 is applied to the root portion Y of the connecting portion 13.
, Y2 can take any value. For example, if Yl is moved upward in Figure 2, the pressure receiving area of Pl will decrease and the pressure receiving area of P2 will increase, so the surface pressure P
3 decreases. Similarly, when Y2 is moved to the left in FIG. 2, the surface pressure P3 decreases. If it is moved in the opposite direction, the surface pressure P3 will increase.

Note that the lip seal 10 may have the seal base 11 fixed to the inner circumferential surface of the shield body 3, and the tip of the lip 12 may be brought into pressure contact with the outer circumferential surface of the cylindrical support portion 2 of the cutter disk. Further, the shape of the tip of the lip 12 may be an edge shape or a surface shape, and the pressure receiving surfaces A and B do not need to be directly continuous, and a vertical surface may be interposed between them. Furthermore, if you put one inch of wood such as an iron plate into the lip 12, the lip 12
The strength of the material can be reinforced.

In actual use, the lip seal 10 is installed in parallel with the conventional limp-shaped lip seal shown in FIG. 1 in the axial direction. It is preferable to install such a lip seal at the last stage. This is because it is important to install the one with the best sealing effect and durability at the last stage in order to improve reliability.

Alternatively, as shown in FIG. 3, the grease may be pumped into the chamber 18 between the conventional lip 30 and the lip 12 of the first embodiment through the hole 15]. In this case, the chamber pressure P5 due to the grease is set to be about 2 IKH/cIII higher than the mud water pressure Pan, and the surface pressure P3 of the lip 12 is adjusted to be 0 to 5 kg/cm2.

FIG. 4 shows a second embodiment, in which a protrusion 20 is formed on the back surface of the lip 12, a rubber plate 21 is fixed between the protrusion 20 and the seal base 11, and a cavity 22 is formed. Vacant room 2
2 and the front surface (muddy water entry side) are communicated through a through hole 23, and a protrusion 24 is formed at the rear of the seal base 11.

In this case, when the mud water pressure Pn+ acts, the lip 12
Surface pressure P1 acts on the pressure-receiving surface A of , muddy water enters the cavity 22 through the through hole 23, and surface pressure P6 acts on the pressure-receiving surface C of the cavity 22. At this time, the surface pressure P6 is the lip 1
A component force is generated that rotates 2 in the counterclockwise direction in FIG. 4 using the root portion 17 as a fulcrum. Therefore, the surface pressure P acting on the tip of the lip 12 is: P, = P, x pressure receiving area - P6 x pressure receiving area (2
) Note that it is expressed by the formula Pm = P, = 'P6, and the surface pressure P3 is reduced by P6 x pressure receiving area, so that the Pv value can be used in a low state. In this case, the surface pressure P3 can be adjusted by changing the areas of the pressure receiving surfaces A and C. For example, if the area of the pressure receiving surface C is increased, the surface pressure P3 will decrease, and vice versa.

Note that the rubber plate 21 needs to have a thickness that allows it to expand under mud water pressure P111, and the protrusion 24 plays a role of supporting the expansion of the rubber plate 21.

FIG. 5 shows a third embodiment, in which the lower half of the lip 12 is made thinner, and the connecting portion 2 extends from the intermediate portion 25 to the seal base 11.
6 is provided to form a cavity 28, and this cavity 28 and the front surface (muddy water intrusion (ltll)) are communicated through a through hole 29.

, the second one, when the mud water pressure P m acts, the surface pressure Pl is applied to the pressure receiving surface A of the lip 12, as in the first and second embodiments.
acts, muddy water enters the empty space 281 from the through hole 29,
A surface pressure P7 acts on the pressure receiving surface D1 of the empty chamber 28. At this time, the surface pressure P7 generates a component force that rotates the lip 12 in the counterclockwise direction in FIG. 5 with the intermediate portion 25 as a fulcrum. Therefore, the surface pressure P3 acting on the tip of the lip 12 is: P3 = P, x pressure receiving area - P7X pressure receiving area ... (
3) It is expressed by the formula Pan = P, = P7, and the surface pressure P3 is reduced by P7 x pressure receiving area, resulting in a lower PV value. In this case, the surface pressure P
3 can be adjusted by changing the areas of the pressure receiving surfaces A and D, as in the case of the second embodiment.

FIG. 6 shows a fourth embodiment, in which a protrusion is formed on the back surface of the lip 12 and a space is formed inside the lip 12, while a space behind the space communicates with a through hole provided in the seal base. It is a small thing that forms.

In this case, when the mud water pressure Pr1l acts, the surface pressure PI is applied to the pressure receiving surface A of the lip 12, as in the first and second embodiments.
acts, muddy water enters the cavity 28 through the through hole 29 provided in the seal base, and surface pressure P7 acts on the pressure receiving surface of the cavity 28. In this case, the surface pressure P7 is applied to the lip 12 at the intermediate portion 25.
A component force is generated that rotates the shaft in the counterclockwise direction in FIG. 6 using the shaft as a fulcrum.

Therefore, the surface pressure P acting on the tip of the lip 12 is P3
= P, x pressure receiving area - P, x pressure receiving area... (3) In addition,
PIIl=P,=P.

The surface pressure P is reduced by P7x the pressure-receiving area, and the PV value becomes lower. In this case, the surface pressure P
3 is a pressure receiving surface A as in the second embodiment.

This can be adjusted by changing the area of D.

FIG. 7 shows a fifth embodiment, in which a protrusion is formed on the back surface of the lip 12, and a cavity is formed between this protrusion and the seal base, and this cavity and the front surface (muddy water entry side) are formed. Penetration 1L
While the trowel is in communication with the trowel, folds are formed in one wall of the vacant room. In this case, when mud water pressure PH1 acts,
When a surface pressure P1 acts on the pressure receiving surface A of the lip 12, 1
The muddy water enters the empty chamber 22 through the through hole 23, and
Surface pressure P6 acts on the pressure receiving surface C of. At this time, the surface pressure P
6 stretches the folds of the upper wall toward the front side, producing a component force that rotates the lip 12 in the counterclockwise direction in FIG. 7 using the root as a fulcrum. Therefore, the surface pressure P acting on the tip of the lip 12
, is reduced accordingly, and the Pv value can be used in a low state.

Note that, of course, a plurality of folds may be formed in the earthen wall.

Further, FIG. 8 shows an example in which the seal according to the present invention is used as a tail seal of a shield.
0 is composed of an annular seal base 1, a rib 12, and a connecting portion 13, and is molded from a rubber material having wear resistance. The lip 12 stands obliquely from the seal base 11 in the direction in which the mud water pressure PI6 acts.

The connecting portion 13 connects the seal base 11 and the lip 12, and is formed at the front where the mud water pressure Pm acts, and the chamber 14 is formed at the back side thereof. Further, an air hole 1G is formed near the base of the lip 12 to communicate the chamber 14 with the inside of the machine, and a four part 15 is formed on the back surface of the connecting part 13.

The four parts 15 promote flexibility of the connecting part 13, and the air holes 16 relieve the pressure in the chamber 14 and promote inward deformation of the connecting part 13.

The tail seal 10 having the above configuration has a seal base 11
is fixed to the inner peripheral surface of the cylindrical skin plate, and the tip of the lip 12 is pressed against the outer peripheral surface of the segment 3.

Here, when the mud water pressure Pm acts, a surface pressure P1 acts on the pressure receiving surface A of the lip 12, and a surface pressure P2 acts on the pressure receiving surface B of the connecting portion 13. At this point, the surface pressure P1 generates a component force that presses the tip of the lip 12 against the outer peripheral surface of the segment, and the surface pressure P2 generates a component force that rotates the lip 12 in the counterclockwise direction in FIG. occurs. Therefore, the surface pressure P3 acting on the tip of the lip 12 is expressed by the following formula: P3=P2×pressure-receiving area−P2×pressure-receiving area (1) where PIll=P,=P2.

That is, in the past, the mud water pressure PI11 acted as the surface pressure P at the tip of the prong 12, but according to the present invention, it is reduced by P2X pressure receiving area, and the friction between the tail seal and the segment is reduced. It can reduce friction, prevent damage to the tail seal, and improve durability.

Then, the surface pressure P3 is the root portion Y l of the connecting portion 13! Y
By moving 2, any value can be obtained. For example, if Y is moved downward in FIG. 8, the pressure receiving area of Pl will decrease and the pressure receiving area of P2 will increase, so the surface pressure P3
decreases. Similarly, when Y2 is moved to the right in FIG. 1, the surface pressure P3 decreases. On the other hand, if it is moved in the opposite direction, the surface pressure P will increase.

Incidentally, it is not intended that the embodiments shown in FIGS. 4 to 7 may be used as appropriate for tail seal applications.

Further, the lip seal according to the present invention is not limited to the above-mentioned embodiments, and various changes can be made within the scope of the gist thereof.

Furthermore, it can be used not only for shield tunneling machines, but also as an oil seal for ordinary mechanical equipment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional glue tongue seal used in a shield tunneling machine. Figure 2 and the following diagrams show examples of the lip seal according to the present invention. Figure 2 is a sectional view of the first embodiment, Figure 3 is a sectional view of a modification thereof, and Figure 4 is a sectional view of the second embodiment. 5 is a sectional view of the third embodiment, FIG. 6 is a sectional view of the fourth embodiment, FIG. 7 is a sectional view of the fifth embodiment, and FIG. 8 is a sectional view of the seventh embodiment. be. 1... Cutter disk, 2... Cylindrical support part, 3...
・Shield body, 10... Lip seal, ] 1...
Seal base, 12... lip, 13... connecting portion, 1
4...vacant room, 21...rubber board, 22...vacant room, 2
3... Through hole, 26... Connection part, 28... Vacant room,
21]...Through hole, Pan...Mud water pressure, P,,P,
,P,,P6. P7... Surface pressure, A, B. C, D...Pressure receiving surface. Patent applicant: Agent of Tigers Polymer Co., Ltd.
Two patent attorneys, Mr. Haga, mentioned above. Engraving of the drawings (no changes to the contents) Figure 1 Figure 2 Figure 3 Figure 4 Figure 4 Figure 5 Figure 6 Figure 1 Procedural amendment (self-motivated) 1988 3 Month 1st 1 Indication of the case 1988 Patent Application No. 13845 2 Name of the invention Seal Patsukin 3 Person making the amendment Relationship to the case Patent applicant address 1-4-1 Shinsenri Higashimachi, 1″11 Toyonaka, Osaka Name Tigers Polymer Co., Ltd. Representative Sawa 1) Hiroshi Yuki 4 Agent 7 Contents of amendment We will amend the drawings (all drawings) as shown in the attached sheet.This amendment a
The drawings attached at the time of application, which were copies, are replaced with drawings drawn using a production method, and there are no amendments to the contents. that's all

Claims (1)

[Claims] (1) In a lip seal interposed between an outer cylinder having a circular inner peripheral surface and an inner cylinder having a circular outer peripheral surface installed coaxially within the outer cylinder, the outer peripheral surface of the inner cylinder or A seal base fixed to the inner circumferential surface of the outer #J (I) and a seal base that stands up at an angle from this seal base toward the direction of hydraulic pressure action and whose tip touches the inner circumferential surface of the outer cylinder or the outer circumferential surface of the internal water. A seal pankin comprising: a sliding part that comes into pressure contact; and a pressure-receiving surface that acts to reduce the surface pressure at the tip of the sliding part by the action of hydraulic pressure.