JP4115745B2 - Mechanical seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical seal device used for, for example, a submersible pump. More specifically, the present invention relates to a mechanical seal device that facilitates assembly and prevents damage to the seal surface during assembly.
[0002]
[Prior art]
As a related technology of the present invention, there is a mechanical seal device 100 shown in FIG. FIG. 4 is a half sectional view of the mechanical seal device 100 used in the submersible pump.
In FIG. 4, the inboard side H between the first housing 150A and the second housing 150B is a sealed fluid region of the oil chamber. The left side in the figure is the impeller side. Furthermore, the right side in the figure is the motor side.
[0003]
In the mechanical seal device 100, a fixing seal ring is disposed on the impeller side housing 150A and the motor side housing 150B, and a rotation seal ring is mounted on the rotary shaft 160 between the housings 150A and 150B. . Each structure of the mechanical seal device 100 is formed as follows. The first cup gasket 131 in which the first rotation sealing ring 104 forms an annular shape with the fitting surface 150B1 of the motor-side housing 150B.ThroughThe seal is fitted. Further, a first fixing sealing ring 104 is fitted on the inner peripheral surface of the first cup gasket 131. The first fixing sealing ring 104 is held on the fitting surface 150B1 by a ring-shaped locking plate 131A.
[0004]
The first rotation seal ring 103 provided with the second seal surface 103A that is in sliding contact with the first seal surface 104A of the first fixing seal ring 104 is located on the inner peripheral surface side of the first rotation seal ring 103. By the first case 111B through the first bellow seal 133B to be sealedOn the rotating shaft 60Is retained. The first case 111B has an annular shape and is formed with two convex portions 111B1 that are equally distributed in the circumferential direction of the inner peripheral surface, and two plate-like stoppers 111B2 on the peripheral surface of the other end. Is formed. The convex portion 111B1 is locked in a locking groove provided in the first rotation sealing ring 103. The stopper 111B2 is locked in a locking groove 102B1 provided on the outer peripheral surface of the first band 102B. Further, the first band 102B is fitted to the rotating shaft 160 via the first bellows seal 133B. The entire configuration of the first rotation sealing ring 103 and the first fixing sealing ring 104 is a first sealing device. And this 1st sealing device is comprised so that the 1st rotation sealing ring 103 and the 1st bellows seal 133B may rotate with the rotating shaft 160 via the 1st case 111B, The 1st rotation sealing surface 103A seals closely with the first fixed sealing surface 104A of the first fixing sealing ring 104.
[0005]
The second cup gasket 132 hermetically fitted to the impeller side housing 150A, the second fixing sealing ring 106 fitted to the second cup gasket 132, the inner peripheral surface of the second fixing sealing ring 106, and the rotating shaft The second bellows seal 133A that seals between the second bellows seal 160 and the second band 102A that fixes the second bellows seal 133A constitutes a second seal device, and the second seal device is the same as the first seal device. The spacers 110 having the same configuration and fitted to the rotary shaft 160 are arranged symmetrically.
The second cup gasket 132 is held by a holding ring 120 attached to the impeller side housing 150A. The second fixing sealing ring 106 is held by a locking ring 116 connected to the holding ring 120.
The first rotation sealing ring 104 of the first sealing device and the second rotation sealing ring 105 of the second sealing device are pressed in opposite directions by one spring 115. In the mechanical seal device 100 configured as described above, the first fixed seal surface 104A and the first rotary seal surface 103A are brought into close contact with each other by the elastic force of the spring 115, and the second fixed seal surface 106A and the second rotary seal surface 105A. Close to each other and seal the fluid to be sealed in the machine interior H.
[0006]
Since the mechanical seal device 100 has a large number of parts constituting the mechanical seal device 100, each component must be stored. When these parts are assembled on-site, the first and second fixing sealing rings and then the first and second rotating sealing rings must be sequentially assembled. It is difficult to achieve accuracy. Further, the sealing surface is easily damaged during the assembly operation, and the sealing ability is a problem. In particular, when assembling the sealing device, the rotating seal rings 103 and 105 and the bellow seals 133A and 133B must be fixed by caulking both ends of the cases 111A and 111B from the outer peripheral side. At this time, since the bellows seals 133A and 133B are made of a rubber material, the caulking process is difficult and cannot be assembled accurately.
Furthermore, the bellow seals 133A and 133B made of rubber must be fixed to the rotating shaft 160 with the bands 102A and 102B. It is difficult to manually fix the bands 102A and 102B on site because the bellows seals 133A and 133b are made of rubber and are elastically deformed so that their positions are not fixed.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and a technical problem to be solved by the invention is a cassette-type mechanical seal device capable of assembling components simultaneously with processing of the mechanical seal device 100. There is in getting. The mechanical seal device can be assembled with high accuracy, and the components can be brought into contact with each other during the storage of the components so as not to cause a malfunction on the functional surface.
Furthermore, the mechanical seal device 100 can be easily incorporated into the mechanical device at the site. Another object of the present invention is to enable assembly without causing scratches or the like on the sealing surface or function part of the sealing ring during the assembly operation.
[0008]
[Means for Solving the Problems]
The present invention has been made to solve the technical problems as described above, and the technical solution means is configured as follows.
[0009]
  The mechanical seal device of the present invention according to claim 1 comprises:The rotating shaft is attached between the first housing and the second housing around the rotating shaft.A mechanical seal device,
  The sleeve having an inner peripheral surface that can be fitted to the rotating shaft, an attachment portion provided on the outer peripheral surface, and mounting seats provided on both sides of the attachment portion,
  A second sealing ring having a second sealing surface disposed on one axial side of the mounting portion of the sleeve;
  A third sealing ring having a third sealing surface disposed symmetrically with the second sealing ring at the mounting portion;
  A first sealing ring for fixing having a first sealing surface in intimate contact with a second sealing surface of the second sealing ring;
  A fixed fourth sealing ring having a fourth sealing surface in intimate contact with the third sealing surface of the third sealing ring;
  A resilient means for resiliently pressing the second seal ring and the third seal ring in opposite directions, one end joined to the outer surface of the first seal ring and capable of contacting the fitting surface of the first housing On the bottom with holes on the side and the peripheral surface on the other end 1 A bottomed cylindrical first case having a cylindrical portion provided with a fitting surface;
  Said Four The first fitting surface is movably fitted to the bottomed portion with a hole on one end side that can be joined to the outer circumferential surface of the sealing ring and to the fitting surface of the second housing, and the circumferential surface on the other end side. A cylindrical bottomed second case having a cylindrical portion provided with two fitting surfaces;
  And the sleeve is mounted on the first mounting seat and the second mounting seat, respectively. 1 Each stop part stopping the seal ring and the fourth seal ring from being pushed out by the resilient means and coming out of the sleeve;
  When the first case and the second case are attached between the first housing and the second housing, the first fitting surface of the first case and the second fitting surface of the second case are The first sealing ring and the fourth sealing ring are inserted into each other and are arranged inwardly between the two stop parts and away from the two stop parts.Is.
[0010]
  In the mechanical seal device of the present invention according to claim 1,A first fitting surface on the free end side of the first case coupled to the first sealing ring and a second fitting surface on the free end side of the second case coupled to the fourth sealing ring are movably fitted to each other. Thus, the first and fourth sealing rings on the inner periphery are held.
At the same time, the resilient means presses one of the second sealing rings against the stop component on the second seal surface side, and elastically presses the other third sealing ring onto the stop component on the third seal surface side. Further, the first sealing ring is pressed and locked to the opposing stop component by the second sealing ring pressed by the elastic means (spring means) and fixed. Similarly, the fourth sealing ring is pressed by the third sealing ring and locked with the opposing stop component, and is fixed. As a result, the entire mechanical seal device is fitted with two stop parts on both sides.It is assembled in a cassette shape. When assembling the mechanical device, the mechanical seal device assembled in the cassette form is incorporated into the mechanical device.ButcompressionIsTheBetween the first housing and the second housingEasy to integrate.In addition, the mechanical seal device, such as a submersible pump, must be replaced because the sealing surface of each sealing ring rapidly wears out. When the device is removed from the first housing and the second housing, each sealing ring can be easily replaced.
[0011]
  The mechanical seal device of the present invention according to claim 2 comprises:It is attached between the rotating shaft, the first housing surrounding the rotating shaft, and the second housing.A mechanical seal device,
  A sleeve having an inner peripheral surface that can be fitted to the rotating shaft, a mounting portion provided on the outer peripheral surface, and mounting seats provided on both sides of the mounting portion;  A second seal ring having a second seal surface disposed on one axial side of the mounting portion of the sleeve, and a third seal having a third seal surface disposed symmetrically with the second seal ring of the mount portion. A fixing first sealing ring having a first sealing surface closely contacting the second sealing surface of the second sealing ring, and a fourth sealing surface closely contacting the third sealing surface of the third sealing ring; The fourth sealing ring, the resilient means for resiliently pressing the second sealing ring and the third sealing ring in opposite directions, and the outer surface of the first sealing ring and the fitting of the first housing The bottomed portion with a hole on one end side that can be joined to the contact surface via a seal portion and the second end on the other end side. 1 Said first of the sealing ring 1 A cylindrical case with a hole having a cylindrical portion covering the outer periphery of the seal surface and the second seal surface of the second seal ring, and the sleeve mounted on the first mounting seat and the second mounting seat, respectively. The first sealing ring and the fourth sealing ring are each pressed by the elastic means to stop the stopper parts from coming out of the sleeve, and the bottomed portion with holes of the case has the first sealing ring. And a retaining portion or a retaining ring that detachably engages with the first housing, and a retaining portion or retaining ring that detachably retains with the first housing.Is.
[0012]
  In the mechanical seal device of the present invention according to claim 2,Conventionally, in a pump or the like, a first housing is incorporated as a part in a second housing that is a main body around a rotation axis. 116) or the like, it becomes difficult to fix firmly. For this reason, the sealing surface of the cup gasket (reference numeral 132 in FIG. 4) between the first sealing ring and the first housing is likely to be worn or scratched, and the sealing ability of the cup gasket becomes a problem.
However, in the case of the present invention, the first sealing surface of the first sealing ring is in intimate contact with the second sealing surface by the detachable locking portion or stopper and the detachable locking portion or retaining ring. And the first sealing ring ensures the coupling with the first housing. At the same time, when disassembling the mechanical seal device, it can be easily disassembled because it is a detachable stop or retaining ring. Moreover, the cylinder part of a case can cover between the joining of a 1st seal surface and a 2nd seal surface from an outer peripheral side, and can prevent damage to each seal surface.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a mechanical seal device according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, each drawing demonstrated below is not the conceptual diagram for patent but the exact design drawing implemented.
FIG. 1 is a half sectional view of a mechanical seal device according to a first embodiment of the present invention.
FIG. 2 is a half sectional view of the mechanical seal device according to the second embodiment of the present invention.
FIG. 3 is a half sectional view of the mechanical seal device according to the third embodiment of the present invention.
[0016]
  In FIG. 1, the mechanical seal device 1 is provided with a first case 7A having a bottomed cylindrical shape with a hole. This first case 7ABottom with holesThe O-ring on the fitting surface 50B formed in a stepped shape on the inner periphery of the first housing 50(Also called seal)32 is attached.
  And the first case 7APerforated bottomAn inner rotation portion 7A1 and an outer rotation portion 7A1 protruding to both sides are formed at the bottomed inner peripheral end. This outer stop 7A1FirstThe first case 7 </ b> A is held so as not to rotate by engaging with a notch 50 </ b> A provided on the inner periphery of the housing 50. Further, the inner locking portion 7A1 enters the recess 6C formed in the first sealing ring 6 and is locked so that the first sealing ring 6 does not rotate.
  Of the first case 7AOf the large diameter tubeThe other end is on the outer surfaceFirst 1A fitting surface 7A2 is formed.
[0017]
A first sealing ring 6 for fixing that forms an annular body is fitted on the inner peripheral surface of the first case 7A. An O-ring 31 is mounted between the fitting surfaces of the first sealing ring 6 fitted to the first case 7A, and the fitting surfaces are sealed by the O-ring 31. Further, a first seal surface 6A protrudes from the end surface 6B of the first seal ring 6. Furthermore, the inner peripheral surface of the first sealing ring 6 is formed with an inner diameter that loosely fits with the sleeve 2.
Further, the support ring 16 is fitted to the inner peripheral surface of the first case 7A and is joined to the end surface 6B of the first seal ring 6 so as to prevent the end surface 6B of the first seal ring 6 from moving in the axial direction. ing.
[0018]
  A second fitting surface 7B2 that is slidably fitted to the first fitting surface 7A2 of the first case 7A.On the inner surface of the tubeThe provided second case 7B is opposed to the first case 7A.The bottom with holesSecond housing 70Fitting part 70BInJoined together with O-ring (also called seal) 32ing. The second case 7B is also symmetrical with the first case 7A and is formed in a bottomed cylindrical shape with a similar shape.
  And the second case 7BPerforated bottomAn inner end 7B1 and an outer end 7B1 projecting to both sides are formed at the bottomed inner peripheral end. This outer stop 7B1SecondThe second case 7 </ b> B is held so as not to rotate by engaging with a notch 70 </ b> A provided on the inner periphery of the housing 70. Further, the inner locking portion 7B1 enters the recess 4C formed in the second sealing ring 4 and is locked so that the fourth sealing ring 4 does not rotate.
[0019]
A fourth sealing ring 4 for fixing that forms an annular body is fitted on the inner peripheral surface of the second case 7B. An O-ring 31 is mounted between the fitting surfaces of the fourth sealing ring 4 and the second case 7B, and the fitting surfaces are sealed by the O-ring 31. Also, the fourth seal ring 4endA fourth seal surface 4A is formed on the surface. Further, the inner peripheral surface of the fourth sealing ring 4 is formed to have an inner diameter that loosely fits with the sleeve 2. The first case 7A and the second case 7B are provided with through holes penetrating into the cabin H1 and the case H2, respectively. This through hole allows the sealed fluid to flow. The materials from the first seal ring 6 to the fourth seal ring 4 are made of a hard material. For example, the material is silicon carbide, ceramic, cemented carbide, carbon material or the like. The materials of the above-mentioned O-rings 31, 32, 33, 34 are fluoro rubber (FKM), nitrile rubber (NBR), butyl rubber (IIR), urethane rubber (U), silicone rubber (Q), chloroprene rubber (CR ), Ethylene propylene rubber (EPM) and the like are preferably used.
[0020]
Next, the inner peripheral surface 2 </ b> B of the sleeve 2 is fitted to the rotation shaft 60. The fitting surface between the rotating shaft 60 and the sleeve 2 is sealed with an O-ring 34.
The sleeve 2 is provided with a mounting portion 2A having a stepped shape on both sides formed in a large diameter substantially at the center. The mounting fitting surface 5C of the second sealing ring 5 for rotation is movably fitted to the step portion on the first sealing ring 6 side of the mounting portion 2A. An O-ring 33 is interposed between the fitting surfaces of the second sealing ring 5 and the sleeve 2, and the fitting surfaces are sealed by the O-ring 33.
A second seal surface 5A is provided on the end surface of the second seal ring 5, and the second seal surface 5A is in close contact with the first seal surface 6A to seal the sealed fluid.
Further, a rotation stop groove 5 </ b> B is formed on the outer peripheral surface of the second sealing ring 5. The rotation stop groove 5B is engaged with the protruding stop portion 11A2 of the first connection case 11A and is connected so that both components rotate together.
[0021]
The first connecting case 11A is formed in a cylindrical shape including a cylindrical portion. The cylindrical portion is fitted to the outer peripheral surface of the second sealing ring 5, and an end portion and a crimping portion 11A3 are provided at both ends of the cylindrical shape. The caulking portion 11A3 is caulked and the second sealing ring 5 is coupled with the end portion. Furthermore, the end of the first connection case 11AofCircumferenceendThe stoppers 11A1 projecting in a plate shape from the two locations enter and engage with the locking grooves 2C provided in the mounting portion 2A, and are connected so that the sleeve 2 and the second sealing ring 5 can rotate together. Yes.
[0022]
An attachment fitting surface 3C of the third seal ring 3 is movably fitted to a step portion on the fourth seal ring 4 side in the attachment portion 2A of the sleeve 2. An O-ring 33 is interposed between the fitting surfaces of the third sealing ring 3 and the sleeve 2, and the fitting surfaces are sealed by the O-ring 33. Further, a third seal surface 3A is provided on the end surface of the third seal ring 3, and this third seal surface 3A is in close contact with the fourth seal surface 4A to seal the fluid to be sealed. Furthermore, a rotation stop groove is formed on the outer peripheral surface of the third seal ring 3.Of the second seal ring 5It is formed similarly to the stop groove 5B. This rotation stop groove is engaged with the convex stop portion 11B2 of the second connection case 11B.
[0023]
The second connection case 11B is formed in a cylindrical shape including a cylindrical portion. The cylindrical portion is fitted to the outer peripheral surface of the third sealing ring 3, and the end portions which are both ends of the cylindrical portion and the crimping portion 11B3. The third sealing ring 3 is coupled in a sandwiched manner. Further, the stopper 11B1 protruding from the end of the second connection case 11B enters and locks the locking groove 2C provided in the mounting portion 2A, and the sleeve 2 and the third sealing ring 3 rotate together. It is connected so that it can.
The material of the first and second connection cases 11A and 11B is iron, steel, stainless steel, aluminum, resin, or the like.
[0024]
The second seal ring 5 and the third seal ring 3 are arranged substantially symmetrically on both sides with the mounting portion 2A as the center. Further, a first washer 12A is disposed between the second sealing ring 5 and the first connection case 11A, and the second washer 12 is also provided between the third sealing ring 3 and the second connection case 11B.BIs arranged. The second sealing ring 5 and the third sealing ring 3 are elastically pressed by a coil spring (elastic means) 15 through the first washer 12A and the second washer 12B. The second sealing surface 5A of the second sealing ring 5 and the first sealing surface 6A of the first sealing ring 6 are brought into close contact with each other by pressing in the elastic state. At the same time, the third seal surface 3A of the third seal ring 3 and the fourth seal surface 4A of the fourth seal ring 4 are in close contact. The assembly seal structure of the first seal ring 6 and the second seal ring 5 on one side of the mounting portion 2A pressed by the coil spring 15 constitutes the first seal device. Furthermore, the mounting portion 2AotherThe assembly seal structure of the third seal ring 3 and the fourth seal ring 4 on the side constitutes the second seal device. Then, the inner chamber is brought into close contact with the seal surfaces 5A, 6A, 3A and 4A of the first seal device by the first and second seal rings 6 and 5 and the second seal device by the third and fourth seal rings 3 and 4. Seal the fluid to be sealed on the H1 and H2 sides.
[0025]
  On the inner peripheral surface 2 </ b> B of the sleeve 2, a positioning portion 2 </ b> F protruding in a ring shape that is engaged with the step portion of the rotating shaft 60 is formed. The positioning portion 2F is positioned when the sleeve 2 is inserted into the rotating shaft 60 and assembled.
  Further, on the outer sides of the first sealing ring 6 and the fourth sealing ring 4 in the sleeve 2,FirstAnnular groove(In the same meaning, also called the first mounting seat)2D andSecondAnnular groove(In the same meaning, also called the second mounting seat)2D is formed. Furthermore, this1st and 2ndIn the annular groove 2D, 2DeachStop ring(Also called stop parts)F1 and F2 are fitted and connected. And1st and 2ndIn the mechanical seal device 1 in the assembled state before being mounted on the housings 50 and 70, the first seal ring 6 and the fourth seal ring 4 pressed in opposite directions by the coil spring 15 are locked to the stop rings F1 and F2. The sleeve 2 is pressed in a resilient state and coupled to the sleeve 2.
  The assembled mechanical seal device 1 is stored, and the mechanical seal device 1 is assembled into the first and second housings 50 and 70 in a set state.
[0026]
When assembled into the first and second housings 50 and 70 in the state of the assembled mechanical seal device 1, the housing is assembled as shown in FIG. In this assembled state, the first sealing ring 6 and the fourth sealing ring 4 move inward from the stop rings F1, F2 and are held on the fitting surfaces 50B, 70B of the first and second housings 50, 70. The
On the other hand, the key 9 is fitted in the keyway 60 </ b> A provided in the rotating shaft 60. A drive ring 8 provided with a groove for joining to the key 9 is fitted to the rotary shaft 60. And the uneven | corrugated shaped locking part provided in the drive ring 8 and the locking part 2E of the sleeve 2 are engaged, and the drive ring 8 is coupled so as to rotate the sleeve 2 together with the rotary shaft 60.
[0027]
FIG. 2 is a mechanical seal device 1 showing a second embodiment according to the present invention.
  The mechanical seal device 1 in FIG. 2 differs from the mechanical seal device 1 in FIG. 1 in that the first case 7A, the second case 7B, and the O-ring 3 in FIG.2Is provided, and the third case 20 is provided instead of the first case 7A. 3rd case(Simply abbreviated as case)20 is an annular body and is fitted to the fitting surface 50B of the first housing 50.(Joining)Provided an outer peripheral surfaceA bottomed cylinder with a hole provided with a bottomed part with a hole and a cylindrical part on the second sealing ring side.It is formed into a shape.
[0028]
  The retaining ring 21 is one end of the third case 20 so that the third case 20 is held by the first housing 50.PerimeterThe third case 20 is held by being fitted to the portion.
  Also, the third case 20On the inner peripheral surface of the large diameter cylinderThe fitted support ring 16 is provided with a stop portion 16A that engages with the concave portion of the first seal ring 6, and the third case 20 and the first seal ring 6 are both rotated by the stop portion 16A.do not doAre so coupled.
[0029]
This mechanical seal device 1BreakAn assembly jig P indicated by a line is inserted into the rotary shaft 60 together with the sleeve 2 from the left side to the right side in FIG. Finally, the retaining ring 21 is fitted to the fitting surface 20 </ b> A of the third case 20 to hold the mechanical seal device 1 in the first housing 50.
[0030]
FIG. 3 shows a mechanical seal device 1 showing a third embodiment according to the present invention.
The mechanical seal device 1 shown in FIG. 3 is different from the mechanical seal device 1 shown in FIG. . The first coil spring 15 </ b> A presses the second sealing ring 5, and the second coil spring 15 </ b> B is configured to press the third sealing ring 3. One end of each of the coil springs 15 </ b> A and 15 </ b> B is supported by a step provided on the attachment portion 2 </ b> A of the sleeve 2 to press the second and third sealing rings 5 and 3.
[0031]
A bellows seal 33A is provided instead of the O-ring 33 shown in FIG. The seal portion 33A1 at one end of the bellows seal 33A is fitted to the step portion of the third seal ring 3.
Furthermore, the 3rd connection case 11C other than the 2nd connection case 11B is provided in the outer peripheral surface of the bellows seal 33A. This 2nd connection case 11B and the 3rd connection case 11C are latched by the unevenness | corrugation to the circumferential direction so that expansion-contraction is possible only to an axial direction. The second connection case 11B and the third connection case 11C are pressed in opposite directions by the second coil spring 15B. The third seal ring 3 is configured to rotate together with the rotary shaft 60 by fitting the bellows seal 33A to the rotary shaft 60 and joining the third connecting case 11C to the sleeve 2.
[0032]
The mechanical seal device 1 according to the third embodiment is inserted by an assembly jig P indicated by a dotted line, similarly to the mechanical seal device 1 shown in FIG. The stop rings F1 and F2 may be removed after the mechanical seal device 1 is mounted on the housings 50 and 70.
[0033]
As described above, in the aspect in which the mounting structure of the sealing ring is variously changed according to the pressure of the fluid to be sealed, the mounting portion 2A is provided on the sleeve 2, and the sealing rings 5, 3 are provided on the mounting portion 2A. The sealing means 5A, 15A are pressed against the opposing sealing faces 6A, 4A by spring means (coil springs) 15, 15A, 15B, and the sealing rings 5, 3 pressed by this elastic force are connected to the stop ring F1, It is configured to be held by F2. Therefore, the entire mechanical seal device 1 is held by the sleeve 2 and can be easily assembled to the housings 50 and 70.
[0034]
【The invention's effect】
The mechanical seal device according to the present invention has the following effects.
According to the present invention, the mechanical seal device fitted to the sleeve is pressed by the spring means, and is assembled by being resiliently locked to the stop ring. When the mechanical seal device formed like this cassette is incorporated in the housing, the spring means is compressed to bring the seal surfaces into close contact with each other, and the first and fourth sealing rings are attached to the fitting surface of the housing. For this reason, the assembly of the mechanical seal device to the mechanical device becomes extremely easy.
Also, when assembling the parts of the mechanical seal device, it was conventionally overlooked and incorporated while damaging the functional surface of the parts. However, since each part is assembled at the mounting part of the sleeve, it is easy to check and damage the parts. It can be effectively prevented.
[0035]
Since the first sealing device and the second sealing device are arranged on both sides of the mounting portion of the sleeve, the second and third sealing rings can be easily pressed by the spring means, and the first and fourth sealing rings can be easily pressed. It becomes easy to hold each of the sealing rings, and it is easy to assemble and hold the entire mechanical seal device in the sleeve.
[0036]
Further, the first sealing device and / or the second sealing device is protected by combining the first case and the second case to cover the first sealing device or / and the second sealing device. Or it becomes possible to assemble without damaging parts when it is assembled into a mechanical device.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a mechanical seal device according to a first embodiment of the present invention.
FIG. 2 is a half sectional view of a mechanical seal device according to a second embodiment of the present invention.
FIG. 3 is a half sectional view of a mechanical seal device according to a third embodiment of the present invention.
FIG. 4 is a half sectional view of a conventional mechanical seal device.
[Explanation of symbols]
1 Mechanical seal device
2 Sleeve
2A Mounting part
2B Inner surface
2C Locking groove
2D annular groove
2E Locking part
2F positioning part
3 Third seal ring
3A Third seal surface
3B, 5B Stop groove
3C, 5C mounting mating surface
4 Fourth seal ring
4A 4th seal surface
4C, 6C recess
5 Second seal ring
5A Second seal surface
6 First seal ring
6A First seal surface
6B end face
7A 1st case
7A1, 7B1 Inner stop, outer stop
7A2 First mating surface
7B 2nd case
7B2 Second mating surface
8 Drive ring
9 keys
11A 1st connection case
11A1, 11B1 Stopper
11A2, 11B2 Stopping part
11A3, 11B3 Caulking section
11B Second connection case
12A, 12B washer
15 Coil spring (bounce means)
16 Support ring
31, 32, 33, 34 O-ring
33A Bellowseal
33A1 Sealing part
50 First housing
50A, 70A Notch
50B fitting surface
60 axis of rotation
60A keyway
70 Second housing

Claims (2)

A mechanical seal device attached between the rotary shaft, a first housing around the rotary shaft, and a second housing ;
The sleeve having an inner peripheral surface that can be fitted to the rotating shaft, a mounting portion provided on the outer peripheral surface, a first mounting seat provided on one side of the mounting portion, and a second mounting seat provided on the other side. ,
A second sealing ring having a second sealing surface disposed on one axial side of the mounting portion of the sleeve;
A third seal ring having a third seal surface disposed at a position symmetrical to the second seal ring in the mounting portion;
A first sealing ring for fixing having a first sealing surface in intimate contact with a second sealing surface of the second sealing ring;
A fixed fourth sealing ring having a fourth sealing surface in intimate contact with the third sealing surface of the third sealing ring;
A resilient means for resiliently pressing the second seal ring and the third seal ring in opposite directions;
It has a bottomed portion with a hole on one end side that can be joined to the outer surface of the first sealing ring and can be joined to the fitting surface of the first housing, and a cylindrical portion having a first fitting surface on the peripheral surface on the other end side. 1st case with a bottomed cylindrical shape with holes,
The first fitting surface is movably fitted to the bottomed portion with a hole on one end side that can be joined to the outer surface of the fourth sealing ring and to the fitting surface of the second housing. A bottomed cylindrical second case having a cylindrical portion provided with a second fitting surface to be
And stop parts which are respectively attached to the first mounting seat and the second mounting seat of the sleeve and stop the first sealing ring and the fourth sealing ring from being pushed out of the sleeve by the elastic means. Equipped,
When the first case and the second case are attached between the first housing and the second housing, the first fitting surface of the first case and the second fitting surface of the second case are inserted into each other. The mechanical seal device is characterized in that the first seal ring and the fourth seal ring are arranged inwardly between the both stop parts and away from the both stop parts . A mechanical seal device attached between a rotating shaft, a first housing surrounding the rotating shaft, and a second housing ,
A sleeve having an inner peripheral surface that can be fitted to the rotating shaft, a mounting portion provided on the outer peripheral surface, and mounting seats provided on both sides of the mounting portion;
A second sealing ring having a second sealing surface disposed on one axial side of the mounting portion of the sleeve;
A third sealing ring having a third sealing surface disposed symmetrically with the second sealing ring of the mounting portion;
A first sealing ring for fixing having a first sealing surface in intimate contact with a second sealing surface of the second sealing ring;
A fixed fourth sealing ring having a fourth sealing surface in intimate contact with the third sealing surface of the third sealing ring;
A resilient means for resiliently pressing the second seal ring and the third seal ring in opposite directions;
The first seal of the first seal ring in the first bottomed portion with holes of joinable end side via the seal portion to fit wear surface of the housing and the other end side while bonded to an outer surface of said first seal ring A bottomed cylindrical case with a hole having a cylindrical portion covering the outer periphery of the surface and the second seal surface of the second sealing ring
And each stop that is mounted on the first mounting seat and the second mounting seat of the sleeve and stops the first sealing ring and the fourth sealing ring from being pushed out of the sleeve by the resilient means. With parts,
The bottomed portion of the case with a hole has a stop or a stop that is detachably locked with the recess of the first sealing ring, and a lock or a retaining that is detachably locked with the first housing. A mechanical seal device having a ring .

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