CN209100637U - High Pressure Difference rotating shaft sealing structure - Google Patents

Abstract

The utility model discloses High Pressure Difference rotating shaft sealing structures, are related to mechanical engineering technical field of sealing technology.High Pressure Difference rotating shaft sealing structure, comprising: rotary shaft, the rotary shaft are provided with thrust face；Sliding bearing, sliding bearing are provided with thinner wall section close to one end of thrust face；Sealing unit, the first O-ring and the second O-ring including contact setting, the first O-ring correspond to aforementioned thrust face setting, and the second O-ring corresponds to aforementioned thinner wall section setting；Rotary shaft thrust towards sliding bearing close to when, thrust face, which provides axial thrust and compresses the first O-ring and form axial sealing contact surface, constitutes first of sealing, while the second O-ring generates radial pressure thinner wall section is made to compress rotating shaft surface and constitutes second sealing.The sealing structure volume of the utility model is small and exquisite, compact-sized, low in cost, can resist the biggish pressure difference of sealing both ends.

Description

High Pressure Difference rotating shaft sealing structure

Technical field

The utility model relates to mechanical engineering technical field of sealing technology, and in particular to a kind of low cost high-voltage difference rotating shaft sealing knot Structure.

Background technique

In machinery industry, in order to obtain good operational effect, it is necessary to retain between rotor and stator or fixing piece Certain gap, to avoid therebetween friction, abrasion even collision etc. failures generation.It is natural but due to the presence in gap The leakage problem between grade with shaft end can be brought, this will reduce the working efficiency of mechanical equipment, this is undesirable certainly. Sealing is exactly that there are under the premise of appropriate gap, avoid leaking with shaft end between grade retaining between rotor and stator or fixing piece Effective measures, and the mechanical structure for being able to achieve this function is then known as sealing device or sealing structure.Not according to sealing structure Together, it is more to can be generally divided into packing seal, sealing, mechanical seal, oil seal, float ring seal, magnet fluid sealing etc. for sealing Kind.

Mechanical seal is small and be widely used in all kinds of pumps due to having many advantages, such as sealed reliable, friction horsepower consumption, It usually may include machine envelope seat, rotating seat, rotating ring, stationary ring, auxiliary sealing member and stretch compensation mechanism, rotating seat and shaft Between be provided with sealing ring, be provided with sealing ring between stationary ring and machine envelope seat, and mechanical seal rotating ring at work in order to prevent Sealing ring on seat skids off, and usually in addition increases a retaining ring in the end of rotating seat at present, but in addition increased retaining ring It is easily deformed under the action of high pressure, influences the sealing reliability of mechanical seal, and retaining ring is simply fallen out during installation Or misplace, keep installation inconvenient；In addition, the sealing ring between stationary ring and machine envelope seat also easily slides out, mechanical seal is influenced Sealing reliability.

Also, although existing rotation shaft mechanical seal is many kinds of, and the sealing structure for being applied to High Pressure Difference rotor axis mechanical is general It is larger all over volume, and structure design is complex, the difficulty of processing of sealing element is very high, causes the cost of sealing element high.

Summary of the invention

The purpose of this utility model is that: overcome the deficiencies of the prior art and provide a kind of compact, it is compact-sized, Low-cost High Pressure Difference rotating shaft sealing structure.The sealing structure of the utility model includes two seals, the surface of two seals Higher pressure easy to form, so as to resist the biggish pressure difference of sealing both ends.

To realize above-mentioned target, the utility model provides following technical solution:

A kind of High Pressure Difference rotating shaft sealing structure, comprising:

Rotary shaft, the rotary shaft are provided with thrust face；

Sliding bearing, the sliding bearing are set in rotary shaft, and sliding bearing is provided with thin close to one end of thrust face Wall portion；

The sealing unit being installed between rotary shaft and sliding bearing, the sealing unit include the first O of contact setting Shape circle and the second O-ring, the first O-ring correspond to aforementioned thrust face setting, and the second O-ring corresponds to aforementioned thinner wall section setting；

Rotary shaft thrust towards sliding bearing close to when, thrust face provide axial thrust compress the first O-ring form axial direction Sealing contact surface constitute first sealing, while contact with the first O-ring the second O-ring generation radial compression applied in preceding Thinner wall section is stated, so that thinner wall section compresses rotating shaft surface and constitutes second sealing.

Further, the sliding bearing is the flexible material production with low-friction coefficient, the diameter that the second O-ring generates Make thinner wall section deformation retract when acting on aforementioned thin-walled portion to pressure, is pressed on rotating shaft surface.

Further, the rotary shaft is the shaft with thrust disc, forms the thrust face by thrust disc.

Preferably, the rotary shaft is made of rigid material, and surface is smooth.

Further, first O-ring is using low-friction coefficient and wear-resisting material makes.

Further, second O-ring is made of elastic material.

It further, further include bearing block, the bearing block and sliding bearing are interference fitted.

Further, the sliding bearing is that hierarchic structure forms the thinner wall section at one end, second O-ring with it is described Thinner wall section contact setting.

Further, the bearing block is L-type structure, and the bearing block, sliding bearing and rotary shaft constitute a seal chamber, institute Sealing unit is stated to be installed in the seal chamber.

The utility model due to using the technology described above, compared with prior art, as an example, has the following advantages that And good effect: 1) sealing unit compact, compact-sized, low in cost, to be realized with a low cost High Pressure Difference rotor axis mechanical Sealing；It 2) include two seals, it is huge can to resist sealing both ends for the surface of two seals higher pressure easy to form Pressure difference.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of High Pressure Difference rotating shaft sealing structure provided by the embodiment of the utility model.

Description of symbols:

Sealing structure 100；

Rotary shaft 110, axis 111, thrust disc 112；

Sliding bearing 120, thinner wall section 121；

Sealing unit 130, the first O-ring 131, the second O-ring 132；

Bearing block 140.

Specific embodiment

High Pressure Difference rotating shaft sealing structure disclosed by the utility model is made below in conjunction with the drawings and specific embodiments further It is described in detail.It should be noted that the combination of technical characteristic described in following embodiments or technical characteristic should not be recognized For be it is isolated, they can be combined with each other to reaching superior technique effect.In the drawings of the following embodiments, each attached The identical label for scheming to occur represents identical feature or component, can be apply to different embodiments.Therefore, once a certain item It is defined in an attached drawing, then in subsequent attached drawing does not need that it is further discussed.

It should be noted that structure, ratio, size etc. depicted in this specification institute attached drawing, only to cooperate explanation The revealed content of book is not limited to the enforceable limit of utility model so that those skilled in the art understands and reads Fixed condition, the modification of any structure, the change of proportionate relationship or the adjustment of size, in the function that does not influence utility model and can be generated Under effect and the purpose that can reach, it should all fall in the range of the revealed technology contents of utility model can cover.This is practical The range of novel preferred embodiment includes other realization, wherein described or discussion the sequence, including root can not be pressed According to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be by the reality of the utility model A person of ordinary skill in the field is applied to be understood.

Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part of specification.Institute that is shown here and discussing Have in example, any occurrence should be construed as merely illustratively, not as limitation.Therefore, exemplary embodiment Other examples can have different values.

Embodiment

It is shown in Figure 1, it is the structural schematic diagram of High Pressure Difference rotating shaft sealing structure provided by the embodiment of the utility model.

A kind of High Pressure Difference rotating shaft sealing structure 100, including rotary shaft 110, sliding axle 120, and it is installed on rotary shaft 110 Sealing unit 130 between sliding bearing 120.

The rotary shaft 120 is provided with thrust face, and the thrust face can provide axial thrust to sealing unit 130.

Specifically, it is shown in Figure 1, it is provided with thrust disc 112 in the middle part of the axis 111 of rotary shaft 120, passes through the thrust Disk 112 forms aforementioned thrust face.

The sliding bearing 120 is set on the axis 111 of the rotary shaft 110, and sliding bearing 120 is close to thrust disc 112 One end be provided with thinner wall section 121.

The sealing unit 130 is installed between the rotary shaft 110 and sliding bearing 120.It is described close in the present embodiment The first O-ring 131 and the second O-ring 132 that unit 130 includes two contact settings are sealed, before first O-ring 131 is corresponding The thrust face setting of thrust disc 112 is stated, the corresponding aforementioned thinner wall section 121 of second O-ring 132 is arranged.

When the thrust disc 112 of rotary shaft 110 is moved to 120 direction of sliding bearing, the thrust face on 112 right side of thrust disc can The first O-ring 131 is compressed, i.e., offer axial thrust compresses the first O-ring 131 and forms axial sealing contact surface, to constitute First of sealing.

Simultaneously as the first O-ring 131 is mobile to 120 direction of sliding bearing, to second contacted with the first O-ring 131 O-ring 132 produces pressure, and then the second O-ring 132 is caused to generate radial pressure (pressure for being directed toward axle center), this radial direction Pressure acts in the thinner wall section 121 of sliding bearing 120, so that thinner wall section 121 further compresses 111 table of axis of rotary shaft 110 Face constitutes second sealing.

The surface of the two seals can form higher pressure, so as to resist the huge pressure of sealing both ends Difference.

The sliding bearing 120, it is preferred to be made of the flexible material with low-friction coefficient, with this, the 2nd O shape The radial compression applied that circle 132 generates enables 121 deformation retract of thinner wall section in aforementioned 121 timesharing of thinner wall section, is pressed on rotation On the surface of shaft 110.

The rotary shaft 110 is preferably made of rigid material, and surface is smooth.

First O-ring 131, it is preferred to use low-friction coefficient and wear-resisting material production.

Second O-ring 132 is preferably made of elastic material.The elastic material, is included in and is under pressure When can restore a variety of materials of deformation when deformation occurs revocation pressure,.

In the present embodiment, the sealing structure 100 can also include a bearing block 140, the bearing block 140 and sliding axle 120 are held as closely interference fit.

Preferably, the sliding bearing 120 is hierarchic structure, so as to form the thinner wall section 121, institute in one end It states the second O-ring 132 and is installed in the thinner wall section 121 and contact setting with the thinner wall section 121.

The bearing block 140 can use L-type structure, bearing block 140,120 and of stair-stepping sliding bearing of the L-type The thrust disc of rotary shaft 110 together forms a seal chamber, and the sealing unit 130 is installed in the seal chamber.

By way of example and not limitation, the encapsulation scheme of the utility model is described in conjunction with typical set-up exemplary in Fig. 1.

When the thrust disc 112 of 110 right end of rotary shaft is close to left end, the first O-ring 131 of low-friction coefficient can be by it The thrust face on right side compresses, and forms axial sealing contact surface, constitutes first of sealing；Simultaneously as the first o shape circle 131 to Left side is mobile, generates pressure to the second O-ring 132 of elastic material production, the second O-ring 132 is caused to generate radially as (referring to To axle center) pressure, this radial compression applied in the thinner wall section 121 of sliding bearing 120 so that thinner wall section 121 deformation receive Contracting compresses 110 surface of rotary shaft, to form second sealing.The surface of this two seals forms higher pressure, so as to To resist the huge pressure difference of sealing both ends.

In the above description, the disclosure of the utility model is not intended to for its own to be limited to these aspects.But Within the scope of the protection of goal of present disclosure, each component can selectively and operatively be merged with arbitrary number. In addition, as the term of " comprising ", " including " and " having " should default it is being interpreted as including property or open, rather than Exclusive or closure, unless it is explicitly defined as opposite meaning.All technologies, science and technology or otherwise term are all Meet meaning understood by one of ordinary skill in the art, unless it is defined as opposite meaning.The public art found in dictionary Language should not be idealized very much under the background of the relevant technologies document or impractically be explained very much, unless present disclosure clearly will It is defined as like that.Any change, the modification that the those of ordinary skill in the utility model field does according to the disclosure above content, Belong to the protection scope of claims.

Claims (9)

1. a kind of High Pressure Difference rotating shaft sealing structure, characterized by comprising:

Rotary shaft, the rotary shaft are provided with thrust face；

Sliding bearing, the sliding bearing are set in rotary shaft, and sliding bearing is provided with thinner wall section close to one end of thrust face；

The sealing unit being installed between rotary shaft and sliding bearing, the sealing unit include the first O-ring of contact setting With the second O-ring, the first O-ring corresponds to aforementioned thrust face setting, and the second O-ring corresponds to aforementioned thinner wall section setting；

Rotary shaft thrust towards sliding bearing close to when, thrust face provides axial thrust and compresses the first O shape figure at axial close Sealing-in contacting surface constitutes first of sealing, while the second O-ring contacted with the first O-ring generates radial compression applied in aforementioned thin Wall portion, so that thinner wall section compresses rotating shaft surface and constitutes second sealing.

2. High Pressure Difference rotating shaft sealing structure according to claim 1, it is characterised in that: the sliding bearing is to rub with low The flexible material production of coefficient is wiped, the radial compression applied that the second O-ring generates makes thinner wall section when aforementioned thin-walled portion Deformation retract is pressed on rotating shaft surface.

3. High Pressure Difference rotating shaft sealing structure according to claim 1, it is characterised in that: the rotary shaft is with thrust disc Shaft forms the thrust face by thrust disc.

4. High Pressure Difference rotating shaft sealing structure according to claim 3, it is characterised in that: the rotary shaft uses rigid material Production, and surface is smooth.

5. High Pressure Difference rotating shaft sealing structure according to claim 1, it is characterised in that: first O-ring is rubbed using low Wipe coefficient and wear-resisting material production.

6. High Pressure Difference rotating shaft sealing structure according to claim 1, it is characterised in that: second O-ring is using elasticity Material production.

7. High Pressure Difference rotating shaft sealing structure according to claim 1, it is characterised in that: it further include bearing block, the bearing Seat is interference fitted with sliding bearing.

8. High Pressure Difference rotating shaft sealing structure according to claim 7, it is characterised in that: the sliding bearing is hierarchic structure The thinner wall section is formed at one end, and second O-ring contacts setting with the thinner wall section.

9. High Pressure Difference rotating shaft sealing structure according to claim 8, it is characterised in that: the bearing block is L-type structure, institute It states bearing block, sliding bearing and rotary shaft and constitutes a seal chamber, the sealing unit is installed in the seal chamber.