JPH048990A - Rotary joint - Google Patents

Abstract

PURPOSE:To prevent a heating or an abnormal abrasion of a seal ring by providing a rotation side joint provided to a rotary roll, a fixing side joint provided to a fixed piping, and a seal releasing means to reduce the adhesive force of a seal ring and the joint by pressing the seal ring. CONSTITUTION:In a rotary joint A provided between a dry roll 7 as a rotary roll and a fixed piping 73 inserted to the inside from the end surface of the dry roll 7, a cylindrical rotation side joint 1 provided at the rotary roll 7 in the condition the fixed piping 73 is inserted to the inside, and a fixing side joint 2 provided to the fixed piping 73 are provided. A seal ring 5 is placed between both joints 1 and 2 through a spring 4 for pressing, and regulation rings 6 and 8 of a seal releasing means to reduce the adhesive force by pressing the seal ring 5 are provided. As a result, generation of a heating and an abnormal abrasion of the seal ring is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for connecting a rotary roll and a fixed pipe inserted into the interior from the end face of the rotary roll, for example, between a drying roll for paper manufacturing and a drain recovery roll. This invention relates to a locking joint for a fixed siphon that is provided between the siphon and the siphon tube.

(Prior art) Conventionally, in this type of rotary joint, a cylindrical rotating side joint is fixed to the end face of a rotating roll with a fixed pipe inserted inside, and a fixed pipe provided on the rotating side joint and the fixed pipe side is fixed to the end face of a rotating roll. It has a structure in which a seal ring is interposed between the fixed side joint and the seal ring via a spring, and the biasing force of the spring rotatably seals between the stationary side joint and the seal ring. Ta.

(Problem to be Solved by the Invention) However, in such conventional rotary joints, when performing so-called dry operation in which steam is not supplied to the rotating rolls, the close contact between the stationary side joint and the seal ring becomes difficult. Since the sliding surface becomes dry, there is a problem in that the frictional resistance of the sliding surface increases, causing heat generation and abnormal wear.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a rotary joint that can avoid heat generation and abnormal wear of the seal ring even during dry operation of the rotating roll. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the rotary joint of the present invention includes a rotary joint provided between a rotating roll and a fixed pipe inserted into the interior from an end surface of the rotating roll. a cylindrical rotation-side joint provided on an end face of the rotation roll with the fixed pipe inserted therein;
A fixed side joint provided in a fixed pipe, a seal ring interposed between both joints via a spring to seal between both joints, and pressing the seal ring against the biasing force of the spring. and a seal release means for reducing the adhesion force with one of the joints.

(Function) In the rotary joint of the present invention, when dry operation of the rotary roll is performed, the seal release means presses the seal ring against the biasing force of the spring, thereby reducing the adhesion force with one of the joints. This makes it possible to avoid heat generation and abnormal wear of the seal ring.

(Example) A first example of the present invention will be described below based on the drawings. In this embodiment, a case will be explained in which a rotary joint is used in a drying roll of a continuous paper machine.

First, the configuration of the embodiment will be explained.

As shown in FIGS. 1 to 3, the rotary joint A of this embodiment includes a rotating joint 1, a fixed joint 2, a sliding collar 3, a pressing spring 4, and a seal ring 5. , adjustment ring 6 are the main components.

The rotating side joint 1 is fixed to the drying roll 7 as a rotating roll, and has a tip portion 10 slightly thicker and a sliding surface 11 perpendicular to the end surface thereof. It is formed into a cylindrical shape. Further, a shaft portion 71 whose rear end portion protrudes appropriately from the bearing 70 of the drying roll 7
Fixed. Then, the straight pipe part 73a of the fixed pipe 73 is inserted through the pipe insertion hole 72 provided in the shaft part 71 of the drying roll 7 and the rotation side joint 1, and is extended to the steam chamber 74 formed inside the drying roll 7. At the same time, a siphon portion 73b is provided at the tip. Further, the straight pipe portion 73a is pivotally supported by a shaft portion 71 of the rotary roll 7 on both sides thereof by bearings 75. Incidentally, steam as a heating medium is supplied to the drying roll 7 from the other shaft portion (not shown).

The fixed side joint 2 is fixed to the machine frame side with the distal end of the fixed pipe 73 removably fixed, and includes a seal cover 21 having a boss section 20 into which the distal end of the straight pipe section 73a is inserted. and a cylindrical body 22 to which the seal cover 21 is detachably fixed on the distal end side. An elbow 23 for connecting external piping is attached to the seal cover 21 so as to communicate with the straight pipe portion 73a. The cylindrical body 22 also includes a sliding collar 3, which will be described later. Pressing spring 4. A seal ring 5 is placed inside,
It is provided so as to be located at the outermost periphery of the rotary joint A, and is detachably attached to the support arm 76 on the machine frame side. Further, this cylindrical body 22 is provided with Ml of the adjustment ring 6 and a female wear thread 24 at the rear end opening. Further, in the figure, reference numeral 25 denotes a locking bolt screwed onto the seal cover 21 to lock the sliding collar 3. Further, the head 26 is prevented from sliding to the end of the shaft by the spring 4 during disassembly. Also, 2
7 is an insertion hole for the pressing spring 4, and 28 is a straight pipe portion 73a.
This is a ceramic bolt that detachably fixes the seal cover 21 to the seal cover 21.

The sliding collar 3 presses the seal ring 5 against the sliding surface 1 of the rotating joint 1, and has a contact surface 30 that presses the seal ring 5 at the rear end, and is approximately ring-shaped. The locking bolt 2 is formed on the outer peripheral surface.
A locking portion 31 is provided to lock the seal cover 2.
It is slidably attached to the boss portion 20 of No. 1. Further, in the figure, 32 is an O-ring that seals between the boss portion 20, 33 is a packing, and 34 is a packing holder that also serves as a spring holder.

The pressing spring 4 presses the sliding collar 3 via the packing retainer 34 to apply pressure to the joint portion, and has one end inserted and fixed into the insertion hole 27 of the seal cover 21.

The seal ring 5 is attached to the sliding surface 1 of the rotating joint 1.
1 and the sliding collar 3 on the fixed side joint 2 side to seal between the rotating side and the fixed side, and has contact surfaces 50a and 50b on both sides and is made of carbon into a substantially ring shape. A protrusion 51 is formed on the outer circumferential surface thereof and is pressed by the adjustment ring 6. The straight pipe portion 73 of the fixed pipe 73 is located inside the cylindrical body 22.
a, one contact surface 50b contacts the sliding surface 11 of the rotation side joint 1, and the other contact surface 50
a is the mounting surface 30 of the sliding collar 3 on the fixed side joint 2 side
It is installed so that it overlaps with the metal.

The adjustment ring 6 is attached to the sliding surface 11 of the rotating joint 1.
It is a means for releasing the close contact between the contact surface 50b of the seal ring 5, and has a male screw 60 on the outer circumferential surface that engages with the female screw 24 provided at the rear end opening of the cylindrical body 22. It is formed into a cylindrical shape having an outer diameter equal to the outer diameter of the protrusion 51 and the width of the groove, and its tip 61 presses the protrusion 51 of the seal ring 5.

Further, a plurality of grooves 62 for hooking a screwdriver are formed on the rear end surface, and a setting groove 63 is provided around the male thread 60. In addition, in the figure, 64 is a dust seal installed inside the adjustment ring, and the hole diameter is formed to be the same size as the outer diameter of the tip lO of the rotation side joint l, and the size is 5 as shown in Fig. 3. When the adjustment ring 6 is screwed in to release the close contact of the seal ring 5, the movement of the adjustment ring 6 causes the adjustment ring 6 to be attached to the tip 10 of the rotation side joint, thereby closing the gap. Also,
65 has a long size 66, and the hook is a groove for use 62 and a groove for setting 63
The locking piece 67 is a bolt that is inserted into the elongated hole 66 to fix the locking piece 65 to the cylindrical body 22.

Next, the operation of this embodiment will be explained.

Since the rotary joint A of this embodiment is constructed as described above, first, when drying paper by supplying steam to the drying roll 7, the adjusting ring 6 is unscrewed to prevent it from loosening during operation. The locking piece 65 is inserted into the setting groove 63 provided in the male thread 60 portion, and the bolt 67 is tightened. At this time, the tip of the adjustment ring 6 is connected to the protrusion 5 of the seal ring 5.
1, and the seal ring 5 is pressed by the urging force of the pressing spring 4 through the sliding collar 3, bringing the rear contact surface 50b into close contact with the sliding surface 11 of the rotating joint 1. A seal is created between the rotating side and the stationary side. Then, as drain water is generated as steam is supplied to the drying roll 7 to heat it, this drain water is absorbed by the siphon part 73b and discharged to the outside from the elbow 23 through the fixed pipe 73. During this heating, the sliding surface 11 of the rotation side joint 1 contacts the contact surface 50b of the seal ring 5.
By sliding the drying drum, it maintains airtightness and allows the drying drum to rotate. In addition, the sliding surface 11 at this time
Since moisture from the steam is taken in and acts as a lubricant, heat generation and abnormal wear of the seal ring 5 are prevented.

Next, when performing dry operation without sending steam to the drying drum due to the difference in the type of paper, first screw in the adjustment ring 6 and bring the tip 61 of this adjustment ring 6 into contact with the protrusion 51 of the seal ring 5 for sealing. Push the ring 5 back toward the pressing spring 4 side.

The seal ring 5 retreats together with the sliding collar 3 and closes to the contact surface 5.
0b is removed from the sliding surface 11 of the rotation side joint l to create a gap g between them. After that, the locking piece 65 is attached to the groove 62 to prevent the adjustment ring 6 from loosening during operation.
Insert and tighten bolt 67. Also, at this time, the dust seal 64 provided on the adjustment ring 6
By screwing in, the rotary joint 1 is attached to the distal end 10 of the rotating joint 1, and the space between the rotating joint 1 and the stationary joint 2 is sealed, thereby preventing dust from entering. In this state, the drying roll 7
Even if the seal ring 5 is rotated without supplying steam, there is no sliding action on the seal ring 5, so that heat generation and abnormal wear of the seal ring 5 can be prevented.

Next, when replacing the seal ring 5, first loosen the set bolt 28 of the seal cover 21 and remove the elbow 23 or the external piping connected to the elbow. It can be pulled in the direction. The sliding collar 3, the pressing spring 4, etc. are attached to the pulled-out seal cover 21. At this time, the seal ring 5 remains inside the cylindrical body 22 in a free state, so the straight pipe portion 7
It can be easily removed by pulling it out from 3a. After replacing the seal ring 5, the assembly can be performed in the reverse order. At this time, since the cylindrical body 22 which requires centering remains attached to the support arm 76, the assembly can be easily performed without the need for troublesome centering work.

As explained above, in the rotary joint A of the first embodiment, when the drying drum 7 is being rotated by supplying steam, the space between the drying drum 7 and the fixed pipe 73 is on the rotating side. Joint 1, seal ring 5. Sliding collar 3
The sealing state is maintained by the boss portion 20 of the seal cover 21, and when performing dry operation without supplying steam, the seal ring 5 can be easily removed from the sliding surface 10 of the rotation side joint 1 by simply screwing in the adjustment ring 6. It is also possible to easily prevent heat generation and abnormal wear of the seal ring 5 by detaching it. The seal cover 21 has a cylindrical body 22
The seal ring 5 can be easily replaced because it can be pulled out from the straight pipe part 73a of the fixed pipe 73 to the distal end side.

Next, a second embodiment of the rotary joint of the present invention will be described based on the drawings. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the explanation of these parts will be omitted.

In the rotary joint A of this embodiment, as shown in FIGS. 4 and 5, the adjustment ring 8 is rotatably fitted into a ring 80 provided at the rear end of the cylindrical body 22 and tightened with bolts. The removal is stopped by a stopper 81. Further, as shown in FIG. 5, a plurality of tapered surfaces 82 and a plurality of flat surfaces 83 are alternately and continuously formed on the side surface of the five seal rings of the adjustment ring 8. As shown in FIG. Also, 84 in Figure 1 is the adjustment ring 8.
This is a turning lever.

Further, the sliding collar 3 has a tapered surface 8 of the adjustment ring 8.
A flange portion 85 is provided opposite to the tapered surface 82, and the same number of through holes 86 as the tapered surface 82 are provided in this flange portion 85. A rod 87 is slidably inserted into the through hole 86, and the head 88 is moved in the direction of the adjustment ring 8 by the biasing force of a pressure release spring 89 that is locked to the head 88 provided at the rear end. It protrudes and its tip is brought into contact with the flat surface 83 of the adjustment ring 8.

Since this embodiment is constructed as described above, when performing a dry operation in which no steam is sent to the drying roll 7, the adjustment ring 8 is rotated using the lever 84, and the rod 87 is moved by the tapered surface 82.
By gradually pushing the pressure release spring 89 to make the urging force of the pressing spring 89 slightly larger than the urging force of the pressing spring 4, the sliding collar 3 can be moved back a little and the seal ring 5 can have some play, so dry operation is possible. It is possible to prevent heat generation and abnormal wear of the seal ring 5 during operation.

Although the present invention has been described in detail above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change within the scope of the present invention, it is not included in the present invention. It will be done.

For example, in the embodiment, a rotary joint is used in a drying roll of a continuous paper machine, but it can also be used in rotary rolls installed in various industrial machines.

Further, in the embodiment, a case is shown in which the seal ring is provided on the stationary side joint side, but it may be provided on the rotating joint side.

(Effects of the Invention) As explained above, in the rotary joint of the present invention, the seal release means can reduce the adhesion force between the seal ring and one of the joints, so that the rotary roll can be operated in a dry manner. Even in such a case, it is possible to avoid heat generation and abnormal wear of the seal ring.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view showing the rotary joint of the first embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is an explanatory view of the same seal ring released from close contact, and Fig. 4 5 is an enlarged sectional view showing the main parts of a rotary joint according to a second embodiment of the present invention, and FIG. 5 is a perspective view of the adjustment ring. 4: Pressing spring (spring) 5: Seal ring 6.8: Adjustment ring (seal release means) 7: Drying roll (rotating roll) 73: Fixed piping

Claims (1)

[Claims] 1) A rotary joint provided between a rotating roll and a fixed pipe inserted into the interior from an end face of the rotating roll, the rotary joint being provided between a rotating roll and a fixed pipe inserted into the interior from an end face of the rotating roll, the rotary joint being provided with A cylindrical rotating side joint provided on an end surface, a fixed side joint provided on a fixed pipe, a seal ring interposed between both joints via a spring to seal between both joints, and the seal ring. A rotary joint comprising: seal release means for reducing the adhesion force with one of the joints by pressing against the biasing force of the spring;