JP4131799B2 - mechanical seal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical seal device that is used in machines, devices, and the like to seal a high-pressure sealed fluid. More specifically, for example, the present invention relates to a mechanical seal device that seals a high-pressure sealed fluid between a housing and a rotary shaft in a pump, a compressor of an air conditioner, and the like.
[0002]
[Prior art]
The related art concerning this invention has the mechanical seal shown in FIG. FIG. 7 is a longitudinal sectional view taken along the axial direction with the mechanical seal mounted on the shaft.
[0003]
In FIG. 7, 100 is a mechanical seal. This mechanical seal 100 is provided between the through hole 121 of the seal housing 120 and the rotary shaft 130 extending to the through hole 121, and seals the sealed fluid F in the in-machine 110A from leaking to the outside 111B. To do.
[0004]
This mechanical seal 100 is configured by a combination of a silicon carbide material fixing seal ring 122 fitted to a seal housing 120 and a carbon material rotation sealing device 101 fitted to a rotary shaft 130. Yes. The fixing seal ring 122 is fixed to the seal housing 120 with an O-ring 123 interposed therebetween, and the O-ring 123 seals between the fitting surfaces of both parts. A fixed seal surface 124 is provided on the end face of the fixing seal ring 122.
[0005]
On the other hand, the rotation seal device 101 is arranged by assembling a rotation seal ring 104, a support ring 111, and a coil spring 113 in a case 115. The rotary seal ring 104 is provided with a rotary seal surface 105 facing the fixed seal surface 124 of the fixed seal ring 122. The sealing surfaces 105 and 124 are pressed against each other to seal the fluid F to be sealed.
The rotation seal ring 104 is provided with a locking projection 106 protruding in a rod shape at the end opposite to the rotation seal surface 105. Further, the rotation seal ring 104 is provided with a fitting hole 108 at the center of the shaft, and the fitting hole 108 is formed so as to loosely engage with the shaft 130 as shown in FIG. Further, the fitting surface between the fitting hole 108 and the shaft 130 is sealed with an O-ring 109.
[0006]
The rotary seal ring 104 is housed in the case 115. The rotating seal ring 104 is pressed in the direction of the fixing seal ring 122 via the support ring 111 by the coil spring 113 mounted in the case 115.
[0007]
A case 115 concentric with the fitting hole 108 in which the rotation seal ring 104 is housed is formed in a bottomed cylindrical shape, and a fitting hole 116 through which the shaft 130 is fitted is provided.
[0008]
Then, the fixing portion provided in the fitting hole 116 is attached by being fixed to the notch portion of the shaft 130. Further, the case 115 is provided with a stopper 117 protruding in a T shape when viewed from the side at a position opposite to the bottomed portion, at a position corresponding to the locking convex portion 106 of the rotation seal ring 104.
[0009]
The stopper 117 is provided with an engagement hole 118 formed as a long hole into which the locking projection 106 is slidably inserted. The engaging convex portion 106 is engaged with the engaging hole 118 so that the rotation seal ring 104 can move along the long hole. A front view of the mechanical seal 100 is as shown in FIG. As is apparent from the configuration of the mechanical seal 100 shown in FIG. 8, the engagement convex portion 106 of the pair of rotation seal rings 104 and the engagement hole 118 of the case 115 are engaged, and the coil spring 113 is used for rotation. The seal ring 104 and the case 115 are pressed in directions opposite to each other, and the engagement convex portion 106 is locked to the end face of the engagement hole 118 so that the rotation seal ring 104 is engaged and held by the case 115. The rotation seal ring 104 and the case 115 are held by a pair of engaging projections 106 and engaging holes 118 that slide relative to each other on both sides of the case 115.
[0010]
For this reason, the latching convex portion 106 and the stopper 117 are configured as a coupling mechanism having an elaborate holding structure with respect to each other, and are configured as precision sliding surfaces subjected to precision machining. Further, the stopper 117 is configured to be thick and strong so that the rotation seal ring 104 can be held only by the stopper 117. However, since the rotation seal ring 104 is made of a carbon material, the Young's modulus is small, and when the high pressure P of the fluid to be sealed is received from the outer periphery, the force M acts as shown in FIG. . On the other hand, the fixing seal ring 122 is made of a silicon carbide material, and thus has a large Young's modulus and does not deform as much as a carbon material. The pressure of the fluid to be sealed also acts from the back surface of the rotation seal ring 104.
[0011]
In this state, as apparent from the state of the rotary seal surface 105 shown in FIG. 9, the contact area of the rotary seal surface 105 is reduced and the rotary seal surface 105 is pressed from the back surface. The lubricating film 105 decreases with sliding. Then, the heat generated by the local friction of the rotary seal surface 105 is seized, galvanized, and damaged on the rotary seal surface 105.
[0012]
Next, when the pressure of the sealed fluid discontinuously changes to a low pressure and the sealed fluid enters a low pressure state, the worn rotation seal surface 105 of the rotation seal ring 104 is restored to the entire rotation seal ring 104. Then, the outer peripheral surface side as shown in FIG.
[0013]
As a result, the pressure of the fluid to be sealed acts on a wedge-shaped space formed between the rotary seal surface 105 and the fixing seal surface 124, so that the pressure F is applied to the rotary seal surface 105. A force acts and presses the back side of the rotation seal ring 104. Then, the sealing surface 105 for rotation is separated from the sealing surface 124 for fixing, and the sealed fluid leaks.
[0014]
9 is caused not only in the rotation seal ring 104 made of carbon material but also in the rotation seal ring 104 made of a hard material such as silicon carbide. That is, since it is impossible to precisely fit the rotating shaft 130 and the rotating seal ring 104, the rotating seal ring 104 is fitted to the rotating shaft 130 via the O-ring 109. For this reason, when the pressure of the fluid to be sealed fluctuates, the entire rotation seal ring 104 is inclined with respect to the axis.
[0015]
When one point of the rotary seal surface 105 is brought into pressure contact, a gap is generated with respect to the fixing seal surface 124 at a position 180 ° from the one point. The sealed fluid leaks from this gap. Further, when the rotation seal ring 104 is inclined, the same behavior as the rotation seal ring 104 made of the carbon material described above is exhibited, and the rotation seal ring 104 is worn and damaged.
[0016]
[Problems to be solved by the invention]
Thus, when the fluid to be sealed is at a high pressure, it is difficult to prevent sliding heat generation on the seal surface even if only the material of the seal ring is changed. Furthermore, it is almost impossible to prevent uneven wear of the sealing surface. Furthermore, seizure, galling, and squealing of the seal surface are caused, and eventually wear damage is caused.
[0017]
The present invention has been made in view of the above-mentioned problems, and the problem to be solved by the invention is to prevent the seal surface of the seal ring from tilting in the mechanical seal and to prevent the sliding surface from being biased. It is to prevent wear. Furthermore, it is to prevent seizure, galling and damage of the sealing surface. Then, the sealing surface is improved by improving the sealing performance.
[0018]
[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.
[0019]
  The mechanical seal of the present invention according to claim 1 is relatively rotated.RuichiPart ofGoods andThe other partWithA mechanical seal that seals between
  A second seal ring having an outer peripheral surface that can be hermetically attached to the other component, an inner peripheral surface that can be loosely fitted to the one component, and a second seal surface at one end surface; A support ring that can be fitted to the one part having one end side opposed to the seal surface formed at a cylindrical tip and having a spring receiving part on the other end; and a base at the tip of the support ring A first sealing ring for sealing a fluid to be sealed, comprising: a sealing portion made of a rubber-like elastic material having a lip portion provided with a first sealing surface that can be bonded and opposed to the second sealing surface; A sealing portion of a rubber-like elastic material that is in close contact with the inner peripheral surface of the support ring and in close contact with the one part, and one end is supported by the one part, and the other end is a spring receiving part of the support ring. Sitting and pressing the first sealing ring against the second sealing ring It comprises means, having a strength than the seal portionOf the support ringAboveThe tip is the lipThe base ofSupportCarryTheThe first sealing surface is held in close contact with the second sealing surface.It is what.
[0020]
  In the mechanical seal of the present invention according to claim 1, a lip portion provided with a seal surface is provided on a seal portion made of rubber-like elastic material, particularly hard rubber or resin material.At the same time, the tip of the support ring adheres to the base of the lip and supports the base.Even under the pressure of the sealed fluidFirstSealing faces are oppositeSecondAgainst sealing surfaceFirstPrevent the sealing surface from tiltingCan expect. For this,BothAs the lubricating liquid intervening on the sealing surface is not cut,Of the sealDemonstrate durability.
[0021]
  AndThe base of the lipUntil the tip of the support ring reachesFirstSeal surfaceIs in close contact with the second sealing surfaceSupportAs well as,FirstSeal surface(Hereinafter, the first sealing surface is also simply referred to as the sealing surface)Lip part withHas strengthIt is supported by the support ring and exhibits pressure resistance.At the same time, since the first sealing ring is composed of a supporting ring having strength except for the lip portion, it exerts pressure resistance against the pressure of the sealed fluid.
[0022]
Furthermore, the sealing surface is always in close contact with the opposing sealing surface (second sealing surface) in parallel and exhibits sealing ability. Further, it prevents an increase in sliding heat generation on the seal surface and effectively prevents seizure, galling and damage to the seal surface.
[0023]
  The mechanical seal of the present invention according to claim 2NoteOf theThe lip portion is formed as a convex portion in the axial direction.
[0024]
  In the mechanical seal of the present invention according to claim 2,Since the lip portion of the seal portion is formed as a convex portion toward the second seal surface, the tip portion can be brought close to the first seal surface. For this reason, the first sealing surface and the second sealing surfaceSealing fluid to be sealed by close contact between sealing surfacesIt is possibleThe And under the pressure of the sealed fluidFirstSeal ringOutsideInclination with respect to the axis due to pressure from the peripheral surfaceSupport ring with strengthIs prevented. For thisFirstSealing faces are oppositeSecondThe sealing surface can be brought into close contact without being inclined by the pressure of the fluid to be sealed, and the sealing ability can be exhibited.
[0025]
  In the mechanical seal of the present invention according to claim 3, the lip portion isFrom the base to the outer diameter directionIt is formed in the lip shape inclined toward.
[0026]
In the mechanical seal according to the third aspect of the present invention, since the lip portion is formed in a lip shape inclined toward the sealed fluid region, when the lip portion receives the pressure of the sealed fluid, the lip portion is Since it is closer and closer to the opposing seal surface, a lubricant is interposed between the seal surfaces to prevent sliding heat generation and to demonstrate the sealing performance of the seal surface.
[0027]
  The mechanical seal of the present invention according to claim 4 is:The sealing portion can be in close contact with the one component on the inner peripheral surface of the support ring on the spring receiving side.With the first seal lipThe inside on the tip sideOn the circumferenceClose contact with the one partA third seal lip.
[0028]
  This claim4In the mechanical seal of the present invention related to,Of theInsideCircumferentialFirstA first sealing lip that seals the sealed fluid on the side opposite to the sealing surface;FirstSeal sideInsideBecause the 3rd seal lip is arranged on the peripheral surfaceThe second1st and 1st3By the seal lip1st seal ringCan be held elastically. For this,By each seal lipHeld resiliently1st seal ringIs, FirstRotating shaft on sealing surfaceofKeep in the centerCanSoFor the second sealing surfaceDemonstrates the sealing ability of the first sealing surfaceCan beThe
[0029]
The mechanical seal of the present invention according to claim 5 is such that the seal portion is made of a rubber-like elastic material having a hardness in the range of 80 ° to 98 °.
[0030]
In the mechanical seal of the present invention according to claim 5, when the hardness of the seal portion is in the range of 80 ° to 98 °, the seal portion has pressure resistance against the pressure of the sealed fluid, and the seal surface is opposed to the seal portion. On the other hand, the sealing surface as a rubber-like elastic material can be elastically deformed and brought into close contact. For this reason, a lubricating liquid intervenes between both sealing surfaces, and sliding heat generation between the sealing surfaces can be effectively prevented.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a mechanical seal 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, each drawing demonstrated below is not a conceptual diagram for patents, but is a design drawing in which a dimensional relationship based on experimental data is accurate.
[0032]
FIG. 1 is a half sectional view of a mechanical seal 1 according to a first embodiment of the present invention. The mechanical seal 1 is mounted between the housing 60 and the rotating shaft 80. FIG. 2 is a half sectional view of the mechanical seal 1 according to the second embodiment of the present invention. FIG. 3 is a half sectional view of the mechanical seal 1 according to the third embodiment of the present invention. FIG. 4 is a half sectional view of the mechanical seal 1 according to the fourth embodiment of the present invention.
[0033]
FIG. 5 is a half sectional view of the mechanical seal 1 according to the fifth embodiment of the present invention. FIG. 6 is a half sectional view of the mechanical seal 1 according to the sixth embodiment of the present invention.
[0034]
In FIG. 1, 1 is a mechanical seal. The mechanical seal 1 includes a first seal ring 2 attached to the rotary shaft 80 and a second seal ring 50 fixed to the housing 60. The first sealing ring 2 can be used for both rotation and fixation. In other words, both the sealing rings can be attached reversely for rotation and for fixation. One of the first sealing rings 2 constituting the mechanical seal 1 is provided with an annular seal portion 3 made of a rubber material. The seal portion 3 has an annular lip portion 3A at one end. The end surface of the lip portion 3A is formed on the first seal surface 3B. The seal portion 3 is provided with a peripheral surface 3C on the inner periphery.3C is formed to have an inner diameter that fits with the rotary shaft 80.
[0035]
The seal portion 3 is made of a rubber material. As the rubber material, for example, nitrile rubber (NBR), ethylene propylene rubber (EPDM), fluorine rubber (FKM), polyacrylate rubber (ACM), polyurethane rubber (AU) and the like are used. In particular, the hardness of the rubber material may be JIS hardness of 80 ° to 100 °, more preferably 80 ° to 98 °. And it is good to use the material excellent in abrasion resistance with intensity | strength. Further, the seal portion 3 can be formed of a resin material. In this case, in order to reinforce the coupling of the seal portion 3 with the support ring 5, holes, convex portions, etc. are provided on the adhesive surfaces of the inner and outer peripheral surfaces 5D and 5E of the support ring 5, and the coupling is performed through the holes. It needs to be strengthened.
[0036]
A metal support ring 5 is formed integrally with the seal portion 3. The support ring 5 has a tip portion 5A for supporting the lip portion 3A at the tip, and a three-stage cylindrical portion toward the rear end. By providing a cylindrical portion by each step portion of the support ring 5, the whole is formed into a structure having strength. The support ring 5 is made of iron, steel, stainless steel, aluminum or the like. It can also be made of plastic or the like.
[0037]
  And the seal | sticker part 3 is each on the inner peripheral surface 5D and the outer peripheral surface 5E of the support ring 5.InContactWearWhenIsBond by baking. The support ring 5 is provided with holes or slits penetrating the bonding surface as necessary, and at the time of molding, a part of the seal part 3 is connected to each other via the holes or slits to connect the seal part 3 to the support ring 5. It is strongly bonded to the support ring 5.
[0038]
  The tip 5A of the support ring 5 is a lip 3A of the seal 3The base ofExtending to thisstickerPart3It is reinforced. The rear end is formed on the flange portion 5B. Notched locking grooves 5C are provided at equal intervals on the outer peripheral portion of the flange portion 5B.Further, as shown in FIG. 2, on the inner peripheral side of the flange portion, a spring receiving portion (reference numeral 14 of an L-shaped part in FIG. 1) that supports one end of a spring (also referred to as spring means) 9 is formed. To do.
  An O-ring 11 is mounted between the inner peripheral surface 5 </ b> D of the step portion of the support ring 5 and the rotation shaft 80. The gap between the support ring 5 and the rotary shaft 80 is sealed by the O-ring 11.The O-ring 11 and the first seal lip 3D, the second seal lip 3E, and the third seal lip 3F, which will be described later, are in close contact with the support ring 5 and the rotary shaft 80 and seal between parts, and are also referred to as sealed portions. .
[0039]
A spring seat 14 is joined to the support ring 5 adjacent to the O-ring 11.
[0040]
The stationary ring 6 is formed in a bottomed cylindrical shape. The bottomed portion is provided with a hole that fits with the rotating shaft 80. The locking portion 6 </ b> B provided on the inner peripheral surface forming this hole protrudes and locks into a groove portion 80 </ b> A provided in the step portion on the outer periphery of the rotating shaft 80. The engaging portion 6B is engaged with the groove portion 80A so that the fixed ring 6 rotates together with the rotating shaft 80.
[0041]
Furthermore, a stopper 6A is formed in the fixed ring 6 in a protruding plate shape at each position corresponding to the notch locking groove 5C on the free end side in the axial direction of the cylindrical portion 6C. And this stopper 6A is comprised so that the 1st sealing ring 2 may rotate with the rotating shaft 80 via the fixed ring 6 by engaging in the notch locking groove 5C. The stationary ring 6 is formed by deep drawing from a steel plate, an iron plate, a stainless steel plate or the like. Alternatively, it can be manufactured by casting.
[0042]
Further, a stopper 6A1 protruding to the inner periphery is formed on the free end side of the stopper 6A, and the stopper 6A1 protrudes radially inward from the notch locking groove 5C of the flange 5B. The stopper 6A is prevented from coming out axially outward from the flange portion 5B.
[0043]
A spring 9 is seated at a bent corner on the outer peripheral side of the bottomed portion of the fixed ring 6, and the tip of the spring 9 is seated on a spring seat 14 to attach the first sealing ring 2. Pressing against a bullet. The first sealing ring 2 pressed by the elastic force of the spring 9 is in close contact with the second sealing surface 50B of the second sealing ring 50. The first sealing ring 2 is slidably supported on the rotary shaft 80 via the O-ring 11. For this reason, the first sealing ring 2 supported by the O-ring 11 can make the first seal surface 3B closely contact the second seal surface 50B. Then, the sealed fluid in the high-pressure sealed fluid region A is sealed by joining the first sealing ring 2 and the second sealing ring 50.
[0044]
Next, the outer peripheral surface of the second sealing ring 50 is fitted to the stepped attachment surface 60 </ b> A of the housing 60 via the O-ring 66. The second sealing ring 50 has a circular cross section formed in a square shape. The second seal ring 50 has a second seal surface 50B formed on the end surface. Further, the second sealing ring 50 is formed with an inner peripheral surface 50A on the inner periphery. A gap is formed between the inner peripheral surface 50A and the rotary shaft 80, and the gap between the inner peripheral surface 50A and the rotary shaft 80 communicates with the low pressure region B.
[0045]
The second sealing ring 50 is made of silicon carbide, ceramic, cemented carbide or the like.
[0046]
The mechanical seal 1 configured as described above allows the sealed fluid on the high-pressure sealed fluid region A side to be in close contact with the first seal surface 3B of the first seal ring 2 and the second seal surface 50B of the second seal ring 50. Seal. Even if the sealed fluid in the high-pressure sealed fluid region A is at high pressure, the first sealing ring 2 is made of a hard rubber-like elastic material. Also, the second seal ring 50B of the second seal ring 50 made of a hard material can be deformed and closely contacted.
[0047]
Moreover, since the support ring 5 is embedded and integrated with the first sealing ring 2 up to the lip portion 3A, the first seal surface supported by the support ring 5 even under the pressure of the high-pressure sealed fluid. 3B can be in close contact with the second seal surface 50B without being inclined. For this reason, since the lubricating liquid always exists between the parallel sliding surfaces of the first seal surface 3B and the second seal surface 50B, it is possible to effectively prevent the sliding frictional heat of the sliding surface from increasing. . Then, seizure, galling, and damage are effectively prevented from occurring on the sliding surfaces of the first seal surface 3B and the second seal surface 50B.
[0048]
FIG. 2 is a half sectional view of the mechanical seal 1 showing a second embodiment according to the present invention.
[0049]
2 is different from the mechanical seal 1 of FIG. 1 in that the seal portion 3 extends substantially over the entire inner peripheral surface 5D of the support ring 5 and is convex on the opposite side of the first seal surface 3B. The first seal lip 3D is formed integrally with the seal portion 3. Then, the O-ring 11 and the spring receiving portion 14 are made unnecessary.
[0050]
Thus, by forming 1st seal lip 3D in the seal part 3, between 1st seal lip 3D and the support ring 6 can be sealed effectively.
[0051]
Originally, the inner peripheral surface 5D of the support ring 5 is difficult to process into a precise surface finish because of the relationship of adhering the seal portion 3. For this reason, when an O-ring is used as in the conventional case, the O-ring sliding due to a change in the fluid pressure to be sealed and the sliding friction between the inner peripheral surface 5D of the support ring 5 wears and has a sealing ability. Although it was lowered, the sealing ability can be improved by integrating the first seal lip 3D with the seal portion 3.
[0052]
Also, since the number of parts can be reduced by integrating the first seal lip 3D with the seal portion 3, the assembly to the device for sealing the first seal ring 2 becomes extremely easy.
[0053]
FIG. 3 is a half sectional view of a mechanical seal 1 showing a third embodiment according to the present invention. In FIG. 3, the difference from the mechanical seal 1 of FIG. 1 is that the second seal lip 3E protrudes in a plate-like lip shape in the opposite direction to the first seal surface 3B. When the second seal lip 3E protruding in the opposite direction receives the pressure of the high-pressure sealed fluid, the second seal lip 3E seals closely to the rotary shaft 80. Even if the pressure of the sealed fluid fluctuates, the second seal lip 3E prevents the first seal surface 3B from acting in the direction away from the second seal surface 50B. On the other hand, in the case of a conventional O-ring, the first seal surface 3B is subjected to an action of separating from the second seal surface 50B because it is elastically deformed according to the pressure fluctuation of the sealed fluid.
[0054]
FIG. 4 is a half sectional view of a mechanical seal 1 showing a fourth embodiment according to the present invention. 4 is different from the mechanical seal 1 of FIG. 1 in that the tip 5A of the support ring 5 is formed in a ring shape and the lip 3A is inclined outward.
The lip portion 3A is made of a hard rubber material and is inclined toward the sealed fluid region side A. Since the lip portion 3A is held by the ring-shaped tip portion 5A, when receiving the pressure of the sealed fluid, Only the first seal surface 3B is in close contact with the second seal surface 50B with an increased sliding area. For this reason, the sealing ability of the sealing surface is improved via the lubricant on the sealing surface. At the same time, since the lubricant slides on the parallel facing sliding surfaces, the generation of frictional heat on the sliding surfaces is prevented.
[0055]
FIG. 5 is a half cross-sectional view of a mechanical seal 1 showing a fifth embodiment according to the present invention. 5 is different from the mechanical seal 1 of FIG. 4 in that a support ring 4 having a U-shaped cross section is fitted on the inner peripheral surface 3C of the seal portion 3. In FIG. The support ring 4 is formed with a holding plate 4A for holding the lip portion 3A so as to protrude long in the same direction as the lip portion 3A. The holding plate 4A holds the lip portion 3A.
With this configuration, the seal portion 3 is supported by the support ring 5 and is held by the support ring 4 provided with the holding plate 4A. Therefore, even if the pressure of the high-pressure sealed fluid is received, the first seal It is possible to hold the surface 3B in a contact state as set with respect to the second seal surface 50B. In particular, the support ring 4 is formed with a holding plate 4A extending in the same shape as the lip portion 3A, and the holding plate 4A supports the lip portion 3A so that it does not elastically deform even when it receives the pressure of the fluid to be sealed. Therefore, the first seal surface 3B is in close contact with the second seal surface 50B and exhibits a sealing ability.
[0056]
FIG. 6 is a half cross-sectional view of a mechanical seal 1 showing a sixth embodiment according to the present invention. 6 is different from the mechanical seal 1 of FIG. 3 in that the first seal lip 3D is arranged in parallel with the second seal lip 3E on the inner peripheral surface 3C of the seal portion 3 on the second seal lip 3E side. And a third seal lip 3F is provided on the inner peripheral surface 3C on the first seal surface 3B side.
With this configuration, the second seal lip 3E is supported and sealed by the first seal lip 3D, so that the space between the inner peripheral surface 3C and the rotary shaft 80 is reliably sealed.
[0057]
  The third seal lip 3F supports the lip portion 3A against the pressure of the sealed fluid. Furthermore, the first seal lip 3D sideCoveredSealing fluidEven if leaksThe first seal lip 3D and the third seal lip 3F are sealed with the third seal lip 3F.BetweenAnd the seal 3 is aeroelastically supported by the accumulated pressure.be able to. The first, second, and third seal lips 3D, 3E, and 3F are used for cooperative operation to improve the sealing ability of the first seal surface 3B.ImproveIs.
[0058]
【The invention's effect】
The mechanical seal according to the present invention has the following effects.
[0059]
  The support ring is a strong structure, and the tip isMade of rubbery elastic materialA lip portion is provided, and the lip portion has a first seal surface.Is provided. Therefore,1st made of rubber-like elastic materialSealing faces are oppositeSecondUnder pressure of fluid to be sealed against the sealing surfaceAlso leanClose effect without slantingPlayingTo do.At this time,1st made of rubber-like elastic materialSeal surfaceIsIntervening lubricating liquid filmLubricated byAs well as improving the sealing ability, it effectively demonstrates its durability.
[0060]
  further, Lip partThe base ofMaAheadReach the endFirstSupports sealing surfaceDoSupport ringThe seal lip provided on the inner peripheral surfaceBySeal between the rotating shafts,And because it is a structure that covers the rotating shaft,Demonstrates pressure resistance against sealed fluid.
[0061]
  Furthermore,1st made of rubber-like elastic materialSealing surface is oppositeSecond toThe seal surface is always in close contact with the seal surface and exhibits the seal ability effectively. Also,The first sealing surface made of rubber-like elastic material is the secondPrevents increase in sliding heat generation on the seal surface, seizing, galling andSecondIt has the effect of preventing damage to the sealing surface.
[Brief description of the drawings]
FIG. 1 is a half cross-sectional view of a mechanical seal showing a first embodiment according to the present invention.
FIG. 2 is a half sectional view of a mechanical seal showing a second embodiment according to the present invention.
FIG. 3 is a half sectional view of a mechanical seal showing a third embodiment according to the present invention.
FIG. 4 is a half sectional view of a mechanical seal showing a fourth embodiment according to the present invention.
FIG. 5 is a half sectional view of a mechanical seal showing a fifth embodiment according to the present invention.
FIG. 6 is a half sectional view of a mechanical seal showing a sixth embodiment according to the present invention.
FIG. 7 is a cross-sectional view of a conventional mechanical seal.
8 is a front view of the mechanical seal of FIG.
FIG. 9 is a state diagram in which the sealing ring of FIG. 7 is eccentric due to pressure.
10 is a cross-sectional view showing a state in which the elastic deformation of the seal ring in FIG. 9 is restored.
[Explanation of symbols]
1 Mechanical seal
2 First seal ring
3 Seal part
3A Lip part
3B 1st seal surface
3C circumference
3D first seal lip
3E 2nd seal lip
3F 3rd seal lip
4 Support ring
4A holding plate
5 Support ring
5A Tip
5B Flange
5C Notch locking groove
5D inner surface
5E outer peripheral surface
6 Fixed ring
6A stopper
6B Locking part
6C cylindrical part
9 Spring
11 O-ring
14 Spring receiving part
50 Second seal ring
50A inner surface
50B Second seal surface
60 housing
60A Mounting surface
80 axes

Claims (5)

A mechanical seal for sealing between the relative rotational hand of the part and the other part you,
A second sealing ring having an outer peripheral surface that can be hermetically attached to the other component, an inner peripheral surface that can be loosely fitted to the one component, and a second seal surface at one end surface;
One end of the second sealing ring facing the second seal surface is formed at a cylindrical tip, and a support ring that can be fitted to the one part having a spring receiving portion on the other end, and the support A seal of a fluid to be sealed, comprising: a seal portion made of a rubber-like elastic material having a lip portion that has a first seal surface that can be in close contact with the second seal surface while adhering a base portion to the tip portion of the ring A first sealing ring for,
A sealing portion of a rubber-like elastic material in close contact with the inner peripheral surface of the support ring and in close contact with the one part;
And a spring means for supporting one end portion on the one component and the other end seating on a spring receiving portion of the support ring to resiliently press the first seal ring to the second seal ring. ,
And wherein the distal end portion of said support ring having strength than the sealing portion first seal surface of said base and supporting lifting of the lip portion is held so closely with the second sealing surface Mechanical seal. Mechanical seal according to claim 1, wherein the lip portion of the front carboxymethyl Lumpur unit is characterized in that it is formed in the convex portion toward the second sealing surface. The mechanical seal according to claim 1, wherein the lip portion is formed in a lip shape inclined from the base portion toward an outer diameter direction . Wherein the sealing portion can be closely the one component on the said inner peripheral surface of the spring and receiving side the one part on the inner circumferential surface of the closely possible first sealing lip the front end portion of the support ring It has a 3rd seal lip, The mechanical seal of Claim 1 or Claim 2 or Claim 3 characterized by the above-mentioned. The said seal | sticker part is comprised with the rubber-like elastic material of the range of hardness 80 degrees-98 degrees, and has adhere | attached on the cylindrical front-end | tip part, The claim | item 1 or Claim 2 or Claim 3 characterized by the above-mentioned. Or the mechanical seal of Claim 4.

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