CN201322094Y

CN201322094Y - Clearance seal structure

Info

Publication number: CN201322094Y
Application number: CNU2008201907355U
Authority: CN
Inventors: 韩乐工
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-11
Filing date: 2008-09-11
Publication date: 2009-10-07
Anticipated expiration: 2018-09-11

Abstract

A clearance seal structure comprises a rotating piece consisting of a shaft sleeve (1) out of a rotary shaft (11) and a movable ring (10) and a static piece consisting of a static ring (3), a locating ring (6) and a gland (8), and is characterized in that the movable ring (10) rotates around an axial cord in a reversed U-shaped annular space which surrounds the axial cord, and is formed by the static ring (3) and the locating ring (6) on the axial direction under the driving of an anti-rotating pin (4), and the front and the rear end surfaces and the outer round surface of the movable ring, the end surface of the static ring and the inner round surface of the static ring form a clearance which is small enough. As the hindering function of a seal ring (5) of the movable ring, medium is compelled to leak along a *-shaped channel in an axial section, thereby increasing the hindering for preventing the medium from leaking in a shorter axial size, and keeping pressure difference on the front and the rear end surfaces of the movable ring, pressure generated by the pressure difference drives the movable ring to move to the end with lower pressure, thereby the clearance between ends becomes smaller, and forms end surface seal, which further increases the hindering to leakage. The clearance seal structure of the utility model has the advantages that the axial size is shorter, and has self sealing performances, thereby greatly increasing the sealing effect of clearance.

Description

A kind of clearance seal structure

Technical field

The utility model relates to solid of rotation clearance seal structure, is a kind of clearance seal structure specifically.

Background technique

Often run into the active chamber of a rotating shaft in the industrial production by a plurality of series connection, and each active chamber is separated it owing to the pressure medium different needs, at different levels as multistage pump, often is furnished with clearance seal between the at different levels and active chamber of sectional type centrifugal compressor and the shaft seal cavity of rotating shaft external part, to reduce interior leakage, improve device efficiency.The problem that the technician is concerned about the most with the clearance seal structure is the effect of sealing, and gap sealed effect depends primarily on the size in gap, geometric elements such as length and shape.Because accuracy of manufacturing, mounting process, temperature difference breathing, the influence of factors such as vibration makes these geometric elements all be subjected to very big restriction, particularly now for economical with materials consumption, reduce cost and all require compact equipment, axial length is short as far as possible, thus this all limited stage distance can not be excessive, this often makes the clearance seal structure be in awkward state.Half is to be fixed on the apparatus casing owing to the clearance seal structure again, and second half is to be fixed in the equipment rotating shaft.In order to prevent that both from colliding mutually, the gap can not be done too for a short time, and that adds equipment long-play medium washes away and vibrate the collision that causes, wearing and tearing must be arranged, and the gap also can enlarge, and increases device efficiency and descends thereby leak in making.

Summary of the invention

The purpose of this utility model provides the short clearance seal structure of making and installing of being easy to of a kind of good sealing effect axial dimension.

Described clearance seal structure, by rotating ring being housed as rotating component on the axle sleeve that is enclosed within the rotating shaft, by stationary ring, positioning ring, gland are formed static element and cursed, and it is characterized in that: rotating ring radially is being made of stationary ring and positioning ring under the drive of stop pin

The type annulus is interior around rotational, and can move forward and backward vertically, while rotating ring front/rear end and stationary ring end face, the garden face constitutes enough little gap in outer garden face of rotating ring and the positioning ring, the inhibition of (or adopting rotating ring and axle sleeve with the very little sliding fit in gap) because seal ring of moving ring makes that medium can only be in the axial cross section The shape path flow, so just in short axial dimension, increased the obstruction of dielectric leakage, and under the effect of front/rear end medium differential pressure, make rotating ring along axially moving, make this end and stationary ring end face form end face seal, the obstruction of dielectric leakage is further increased to the low end of pressure.

From the above mentioned, this clearance seal structure helps producing very little gap, and has the performance of automatic generation.Usually equipment always has vibration in the running and takes place, and has axially, also has radially.And the rotating ring of this clearance seal structure is can be axially movable, it is big that one splaying becomes, the other end gap will diminish, therefore hard collision can not take place, thereby it has very strong adaptive capacity to axial vibration, again because the end clearance is on the plane perpendicular to axis, thereby it is also insensitive to vertical vibration, can not reduce the gap because of this vibration, can make the end clearance become littler following of the effect of pressure reduction on the contrary, thereby described structural type can both keep good clearance seal effect when vibration takes place equipment.

The utility model has the advantages that: axial dimension is shorter, and has selfsealings, thereby the clearance seal effect greatly increases.

Description of drawings:

Fig. 1 is the utility model structure one schematic representation.It is little generally to be used for dielectric viscosity, and temperature is lower than under the operating mode of 200C.

Fig. 2 is the utility model structure two schematic representation.Can be used for the big or temperature of dielectric viscosity is higher than under the operating mode of 200C.

Among Fig. 1: 1-axle sleeve, 2-sleeve sealing circle, 3-stationary ring, 4-stop pin, 5-seal ring of moving ring, 6-positioning ring, 7-stationary ring seal ring, 8-gland, 9-lock screw, 10-rotating ring, 11-axle.

Among Fig. 2: 1-axle sleeve, 2-sleeve sealing circle, 3-stationary ring, 4-stop pin, 12-stationary ring stop pin, 6-positioning ring, 8-gland, 9-lock screw, 10-rotating ring, 11-axle.

Embodiment

Below in conjunction with accompanying drawing the utility model is further specified: be that the whole pump housing is at clearance seal part-structure schematic representation as shown in Figure 1.Front end is that pressure medium is the active chamber of P1, and the rear end is that pressure medium is the active chamber of P0, pressure medium P1＞P0, and the clearance seal structure just is contained between these two active chambers.Be furnished with rotating ring 10 on running shaft 11 external axle sleeves 1 and under the drive of stop pin 4, make revolving part, stationary ring 3, positioning ring 6, gland 8 constitutes static element, it is characterized in that: stationary ring 3, positioning ring 6 is radially constituting a ^ type annulus around axis, rotating ring 10 under the drive of stop pin 4

The type annulus is interior around rotational, and the garden face constitutes enough little gap in its front/rear end and outer garden face and stationary ring end face and the positioning ring, owing to the inhibition of seal ring of moving ring 5 (or the very little sliding fit of rotating ring and axle sleeve employing gap) force medium axially along

Leak in the shape path, and maintain pressure reduction in the rotating ring front end and back end, and the pressure that this pressure reduction produces will make rotating ring move to the low end of pressure, thereby make the littler formation end face seal that becomes of this splaying, and this can make the obstruction of leakage increase greatly again.

Should hold following technological points when being contained on the equipment according to structure of the present utility model to it: stationary ring 3 is mixed and should be made the stationary ring seal ring have enough tension forces to rotate to prevent stationary ring 3 when stationary ring seal ring 7 is packed in the Seal cage.The front/rear end of rotating ring 10 should be done certain technical finesse according to working condition before assembling, to avoid that dry friction takes place when moving.After tightening, gland 8 should remain with expansion gap with stationary ring 3.Axle sleeve 1 is mixed seal ring 2 and is contained in when axle is gone up with screw 9 locking backs with setting stick car rotatingshaft the generation of jam phenomenon must not be arranged.After everything was normal, the clearance seal structure can be devoted oneself to work.The utility model has compared with prior art only structurally been done simple improvement, and manufacturing process and structure do not have big variation, and can in short axial dimension gap sealed effect significantly be promoted, and has reduced materials consumption, has promoted device efficiency.Have more excellent clearance seal effect as long as material selection is proper.

Claims

1. clearance seal structure, by the outer axle sleeve (1) of running shaft (11), rotating ring (10) is made revolving part, stationary ring (3), positioning ring (6), gland (8) is made static element and is formed, it is characterized in that: rotating ring (10) under the drive of stop pin (4) by stationary ring (3) and positioning ring (6) at one that radially constitutes " ∏ " and in the font annulus around rotational, and its front/rear end and periphery and stationary ring end face and positioning ring inner headed face constitute enough little gap, because the inhibition of seal ring of moving ring (5) can only be medium in axial cross section " several " path of font leaks.

2. clearance seal structure according to claim 1, rotating ring (10) also can move axially, and can constitute end face seal with the stationary ring (3) of an end under the effect of pressure reduction.