CN2453177Y

CN2453177Y - Self-banalcning, internal blocking and premounting type mechanical sealing used for pump

Info

Publication number: CN2453177Y
Application number: CN 00259585
Authority: CN
Inventors: 周剑平
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-09
Filing date: 2000-12-09
Publication date: 2001-10-10
Anticipated expiration: 2010-12-09

Abstract

The utility model relates to a self-balancing, internal blocking and pre-mounting type mechanical sealing used for pumps, which belongs to the field of mechanical seal. The utility model comprises a flange, a shaft, a spring, a spring base, a movable ring, a clamping ring, a static ring, etc., and the utility model is characterized in that a pre-mounting mechanism which is composed of the clamping ring, the movable ring, the spring base and the spring is arranged on the shaft and is fixed by holding screws in the spring base. When the shaft and fluid medium form unbalanced type sealing, an annular shoulder of the spring base can change the end surface distance of the sealing so as to change into balanced type sealing, therefore, the utility model solves the problem of fluid leakage and is an ideal mechanical sealing element at present.

Description

Pump is with blocking the prepackage type mechanical sealing element in the self balancing

The utility model relates to the mechanical seal field, is that a kind of pump is with blocking the prepackage type mechanical sealing element in the self balancing.

Mechanical sealing element is mainly used in equipment such as the rotary pump class of carrying all kinds of flowing mediums, stirrer, compressor, and its effect is to stop flowing medium that rotary mechanism carries along the slot leakage between turning axle and the mechanical hull.The principle of mechanical seal is that the gap sealing between the running shaft housing is converted to rotating ring of himself and the sealing between the stationary ring end face.(as comparing with packing seal) compared in mechanical seal with the sealing of other form, advantage is that leakage rate is few, can compensate automatically, and working life is longer.But the pump class that contains media such as particle, fiber, easy obstruction, easy crystallization in conveying, the mechanical seal effect is not good enough at present, the subject matter that exists is: (1) spring directly contacts with flowing medium, cause spring to descend as particle deposition, fiber obstruction, medium crystallization, corrosion etc., can not compensate and sealing surface is applied pretightening force, cause mechanical seal to be lost efficacy.(2) under the condition that does not change mechanical seal installation dimension and external dimension, can not realize the pressure balance of fluid medium, make unbalanced type mechanical seal become balanced mechanical seal.

The purpose of this utility model is, provides a kind of pump with card prepackage type mechanical sealing element in the self balancing, directly contacts with flowing medium and makes flexibility decrease, the pressure balance problem of mechanical seal to solve spring.

The above-mentioned purpose design proposal is such: it the rotatingshaft that is used for the rotary pump class set up an energy self balancing in the pre-mounting mechanism of card, the isolation of this pre-mounting mechanism and flowing medium also is provided with axial shift fork transmission.When rotatingshaft is not changing under the mechanical seal installation dimension condition, come adjustment by changing seal face, thereby improve the performance of mechanical seal.

Its advantage is can compensate automatically sealing surface is applied pretightening force, stops leakage phenomenon, makes class on the mechanical seal product technology.

Description of drawings:

Fig. 1 is an organigram of the present utility model.

Sequence number among the figure: 1, O shape circle, 2, stationary ring, 3, snap ring, 4, rotating ring, 5, back-up ring, 6, O shape circle, 7, Cock screw, 8, O shape circle, 9, spring seat, 10, spring, 11, axle, 12, flange.

Referring now to above schematic representation, its feature is further described: pump is with blocking the prepackage type mechanical sealing element in the self balancing, comprise flange, axle, spring, spring seat, O shape circle, Cock screw, back-up ring, rotating ring, snap ring, stationary ring etc., by snap ring 3, rotating ring 4, spring seat 9, spring 10 form pre-mounting mechanism and be arranged on the axle, snap ring and spring seat are to be pressed into reverse gradient, uniform several springs in the spring seat, back-up ring 5 and O shape circle 6 is housed between spring seat and rotating ring, rotating ring can be at spring seat axially do the shift fork transmission, be provided with O shape circle 8 at spring seat and between centers, and be provided with Cock screw 7.Spring seat 9 is provided with annular shoulder, rotating ring 4 is provided with annular dome, spring 10 in the spring seat is spacing by the annular dome of rotating ring institute, the axle 11 and the flowing medium of non-equilibrium rotation, left-hand by the flange of radially installing 12 of axle, O shape circle 1, stationary ring 2 is isolated, the dextrad of O shape circle 6, O shape circle 8 is isolated, and utilizes the annular shoulder of spring seat to change the seal face distance, makes unbalanced type mechanical seal be converted to balanced mechanical seal.Axle shown in Figure 1 is an imaginary pump shaft, and spring seat, snap ring and rotating ring are vital parts of the present utility model, and spring seat is provided with two place's annular shoulders, and wherein the annular shoulder that diameter is bigger is for stressed yielding place of rotating ring.And the less annular shoulder of diameter is by the annular dome institute hitch of rotating ring, and it withstands built-in type spring uniform in this annular shoulder, plays buffer function.Diametric plane at rotating ring and spring seat is provided with back-up ring and O shape circle, is provided with stationary ring between rotating ring and the flange, and stationary ring is made up of metallic material and cemented carbide.Be not difficult to find out that from Fig. 1 flowing medium is directly not contact with snap ring, spring, Cock screw is spacing fixing in addition, non-equilibriumly obtains the purpose that card prepackage type balanced mechanical seal effect in the self balancing reaches the design when stressed.

Omit the drafting of the pump housing, impeller, motor and relevant pipeline among Fig. 1, simple and easy drafting flange and axle, the characteristic of mainly outstanding the utility model structure.The metallic material of this Sealing all adopts stainless steel, can be supporting with the pump class of different model.Structural design compactness, layout are comparatively reasonable.Have certain corrosion protection, anti-leak function.

Claims

1, pump is with blocking the prepackage type mechanical sealing element in the self balancing, comprise flange, axle, spring, spring seat, O shape circle, Cock screw, back-up ring, rotating ring, snap ring, stationary ring etc., it is characterized in that by snap ring (3), rotating ring (4), spring seat (9), spring (10) form pre-mounting mechanism and be arranged on the axle, snap ring and spring seat are to be pressed into reverse gradient, uniform several springs in the spring seat, back-up ring (5) and O shape circle (6) is housed between spring seat and rotating ring, rotating ring can be at spring seat axially do the shift fork transmission, be provided with O shape circle (8) at spring seat and between centers, and be provided with Cock screw (7).

2, pump as claimed in claim 1 is with blocking the prepackage type mechanical sealing element in the self balancing, it is characterized in that spring seat (9) is provided with annular shoulder, rotating ring (4) is provided with annular dome, spring in the bullet seat (10) is spacing by the annular dome of rotating ring institute, axle of non-equilibrium rotation (11) and flowing medium, isolate by the flange of radially installing (12) of axle, the left-hand that O shape is enclosed (1), stationary ring (2), the dextrad of O shape circle (6), O shape circle (8) is isolated, utilize the annular shoulder of spring seat to change the seal face distance, make unbalanced type mechanical seal be converted to balanced mechanical seal.