CN2038578U

CN2038578U - Hydraulic shaft sealing device

Info

Publication number: CN2038578U
Application number: CN88214531U
Authority: CN
Inventors: 姚长江; 陈正斌
Original assignee: NO 5 OIL PRODUCTION FACTORY DA
Current assignee: NO 5 OIL PRODUCTION FACTORY DA
Priority date: 1988-09-30
Filing date: 1988-09-30
Publication date: 1989-05-31

Abstract

The utility model discloses a hydraulic shaft sealing device for shaft seal part at pump end which can solve the leak-free problem of pump end. The hydraulic shaft sealing device is characterized in that a helical runner and guide blades (1, 2) are orderly sheathed on a shaft [9] in the shaft seal part at pump end, the helical runner and the guide blades (1, 2) are relative rotators, and helical grooves (10, 13) with opposite direction are separately arranged in the relative rotating surface of the relative rotator. A sealing ring [6] is thread-jointed with the end of the helical guide blade (2), circular cavities [14] are arranged between the sealing ring and the helical runner, the sealing ring and helical guide blades (1, 2), the circular cavity [14] is provided with a sealing ring [5], and the pump is sealed by the sealing ring [5] when stopping. The pump is sealed by two helical grooves (10, 13) when rotating. The hydraulic shaft sealing device has the advantages of reliable sealing performance, low energy consumption and long service life, so the hydraulic shaft sealing device is an advanced shaft sealing device.

Description

Hydraulic shaft sealing device

A kind of hydraulic shaft seal device that is used for pump end axle envelope place.

For preventing that the pump housing outer air from entering, interior leak of liquid, generally filler or mechanical seal are arranged at pump end axle envelope place, its structure is complicated, and energy consumption is bigger, and sealing effect is not good, influences pump efficiency and working life, befouling environment.

The design's purpose: design a kind of simple in structure, hydraulic shaft seal device that seal degree is high, make pump stop or rotation process in watertight, cut down the consumption of energy, improve pump efficiency, increase the service life; The technological scheme that realizes its task is: be provided with helical runner at pump end axle envelope place, the spiral stator radially is being placed on the axle successively, the two has direction opposite helical groove for relatively rotating body on the face of relatively rotating; Be connected with stationary seal ring at spiral stator end internal thread, between it and helical runner, spiral stator annular room is arranged, dress seal ring in it, it is a not homomorphs conical ring body of footpath, two centers, one end interference is loaded on the helical runner end, and the other end places in the annular room and is pressed on the stationary seal ring; When pump is static, compresses (holding tightly) under the effect of seal ring hydrostatic pressure and self elastic force in pump and play seal action; During the pump rotation, seal ring is ineffective, finishes sealing by helical runner, stator, and it makes the liquid generation backpressure of partly desiring to external leakage stop continuous desire to want the liquid of external leakage; Thereby realized to pump rotate, inclusion seal when static; Contact owing to helical runner rotates to have broken away from other with pump with seal ring, this has just reduced an axle envelope energy consumption and wearing and tearing widely, thereby has prolonged the working life of gland seal device again.

To be described in more detail the design below in conjunction with accompanying drawing:

Fig. 1 is a hydraulic shaft seal device structure half-sectional view;

Fig. 2 is zero work ［ 2 ］ structural drawing on Fig. 1;

Fig. 3,4,5th, part on Fig. 1 ［ 5,1,6 ］ structural drawing.

By shown in Figure 1, be provided with helical runner ［ 1 ］ at pump end axle envelope place, spiral stator ［ 2 ］ radially is being placed on the axle successively, the two is the body that relatively rotates that the certain interval ring is arranged, and the opposite spiral chute of direction ［ 10,13 ］ is arranged respectively on the face of relatively rotating; In the end of helical runner ［ 1 ］ circular groove ［ 11 ］ is arranged, helical runner ［ 1 ］ is fastened on the axle ［ 9 ］ with spiral and cap ［ 8 ］; Spiral stator ［ 2 ］ is fixed in the pump end by its body upper ring body ［ 12 ］ with bolt ［ 3 ］, and zero type seal ring ［ 4 ］ is housed therebetween; Two relative rotors ［ 1,2 ］ not hinder assembling and operation, should dwindle the annular space as far as possible.

Be connected with stationary seal ring ［ 6 ］ at spiral stator ［ 2 ］ end internal thread, circular groove ［ 16 ］ is arranged on it, zero type seal ring ［ 7 ］ is housed, also have conical ring body ［ 15 ］ on it; Be provided with between helical runner ［ 1 ］, spiral stator ［ 2 ］ and stationary seal ring ［ 6 ］ and circular groove ［ 11 ］, the external annular room ［ 14 ］ that is communicated with, seal ring ［ 5 ］ is housed in it, it is an elastomer, can be made by rubber; Seal ring ［ 5 ］ is the conical ring body that the different body in two centers footpaths constitutes, and an end interference is loaded in the circular groove ［ 11 ］, and the other end cross section is that circle or non-circular geometric face place in the annular room ［ 14 ］ and be pressed on the conical ring body ［ 15 ］ of stationary seal ring; The section configuration of seal ring ［ 5 ］ as

Reach the optimal seal effect, best physical dimension and assemblage gap must be arranged on static seal and motive sealing mode.

1, to static seal requirement partly:

The elasticity of seal ring ［ 5 ］ self will suit, and after the termination of pumping, seal ring ［ 5 ］ relies on elastic shrinkage to compress (holding tightly) on the conical ring body ［ 15 ］ of stationary seal ring ［ 6 ］, seal leakage liquid, wherein to compress (holding tightly) power little for seal ring ［ 5 ］, and sealing effect is poor, and it is fast to lose efficacy; Power is excessive then easily burns and increases wearing and tearing, seals also very fast inefficacy; After pump rotated, seal ring ［ 5 ］ compressed that the lip limit disengages and rotates with axle, avoids wearing and tearing.

2, motive sealing is partly:

Spiral chute ［ 10,13 ］ on helical runner ［ 1 ］, the stator ［ 2 ］ can adopt triangle, trapezoidal, rectangle and buttress thread form, and its sealing lift reduces successively, and the square threaded form consumed power is then minimum; Change its number of starts simultaneously, the sealing lift is increased, according to the different screw thread form of different choice to sealing load and power consumpiton; The design adopts trapezoidal thread, and wherein the number of starts on the helical runner ［ 1 ］ is 1.2～2 times of number of starts on the spiral stator ［ 2 ］, and its sealing lift is increased.

Reduce the top width of screw thread, the sealing lift is increased, but the power of consumption is increased, its width should be determined with the limit of processing.

Increase the length of sealing screw groove (screw thread), the sealing lift is increased, exceed with pump structure.Can make secondary or multistage structure in case of necessity.

The height of screw thread is selected also can improve the sealing lift when suitable.The revolution of pump is high more, and the sealing lift that motive sealing produces is also just high more.

Helical runner ［ 1 ］, stator ［ 2 ］ are for relatively rotating body, and gap therebetween should dwindle as much as possible with under the prerequisite that does not hinder assembling and operation.So-called sealing lift: this device motive sealing when working, the lift that is produced (or pressure); This lift (or pressure) balances each other with the liquid lift (or pressure) that desire is leaked.

Be the pump of negative pressure to sucking, then the approaching former end of helical runner ［ 1 ］, spiral stator ［ 2 ］ have respectively one section with the opposite screw thread of self spiral chute direction, just can prevent entering of air.

Implementation result: the design is owing to adopted quiet, motive sealing two parts, and when pump was static, seal ring ［ 5 ］ was tightly embraced on seal ring ［ 6 ］ under the contraction of hydrostatic pressure and self elastic force, realizes the sealing to pump; When pump rotates, under action of centrifugal force, make the lip limit of seal ring ［ 5 ］ break away from stationary seal ring, lose seal action, because the moving part disengaging contacts with other part, avoids wearing and tearing, reduce an axle envelope energy consumption, its energy consumption is a gland sealed 1/40～1/8, is 1/8～1/3 of mechanical seal; After pump rotates, at this moment the sealing of pump is finished by helical runner ［ 1 ］, the stator ［ 2 ］ of device, above it to opposite spiral chute ［ 10,13 ］ effect down, it makes the liquid of partly desiring to external leakage produce backpressure to stop and continue the liquid that desire is wanted external leakage in the pump.Thereby realized that its sealability is reliable to inclusion seal static on the pump, when rotating, energy consumption is little, and the seal arrangement life-span is long, is comparatively advanced at present pump housing axle envelope place seal arrangement.

Claims

1, the design relates to a kind ofly at pump end axle envelope place hydraulic shaft seal device, it is characterized in that:

1) be provided with helical runner [1], spiral stator [2] at pump end axle envelope place and radially be placed in successively on the axle [9], the two is the body that relatively rotates that the certain interval ring is arranged, and the opposite spiral chute of direction [10,13] is arranged respectively on the face of relatively rotating; There is circular groove [11] end of helical runner [1], is fastened on the axle [9] with spiral and cap [8]; Spiral stator [2] is fixed in the pump end by its body upper ring body [12], and seal ring [4] is housed therebetween;

2) be connected with stationary seal ring [6] at spiral stator [2] end internal thread, be provided with seal ring [7] therebetween; Have and circular groove [11], the external annular room [14] that is communicated with between stationary seal ring [6] and helical runner [1], spiral stator [2], seal ring [5] is housed in it, it is an elastomer;

3) seal ring [5] is the conical ring body that the different body in footpath, two centers constitutes, and an end interference is loaded in the circular groove [11], and the other end is pressed on the stationary seal ring [6];

2, hydraulic shaft seal device as claimed in claim 1 is characterized in that: on stationary seal ring ［ 6 ］ body conical ring body ［ 15 ］ is arranged;

3, hydraulic shaft seal device as claimed in claim 1 is characterized in that: the section configuration of seal ring ［ 5 ］ as