CN216895020U

CN216895020U - Reverse-pressure-prevention wave spring mechanical sealing device

Info

Publication number: CN216895020U
Application number: CN202220022591.2U
Authority: CN
Inventors: 李海涛; 张昌盛; 夏阳; 郇维东; 郇星海; 郇想; 孙士东; 张煜国
Original assignee: Sunrise Petrifaction Equipment Co ltd
Current assignee: Sunrise Petrifaction Equipment Co ltd
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-07-05
Anticipated expiration: 2032-01-06

Abstract

The utility model provides a prevent ripples spring mechanical seal device of back pressure, the bush sealing washer is equipped with in rotating ring bush internal diameter department, the spring holder is equipped with in rotating ring bush external diameter department, the rotating ring bush passes through holding screw with the spring holder and fixes, wave spring is equipped with on the right side of spring holder, the throw-out collar is equipped with on wave spring's right side, the rotating ring is equipped with on the right side of throw-out collar, the rotating ring sealing washer is equipped with between the external diameter of rotating ring bush and the internal diameter of rotating ring, quiet ring is equipped with on the right side of rotating ring, quiet ring sealing washer is equipped with in the external diameter department of quiet ring, quiet ring retaining ring is equipped with in the left side of quiet ring, the jump ring is equipped with in the left side of quiet ring retaining ring. The utility model adopts the wave spring as an elastic force compensation part to keep the end face of the mechanical seal attached, the static ring adopts the design of an anti-back pressure structure, the static ring retaining ring and the clamp spring are adopted to prevent the static ring from coming off due to pressure change, the dynamic ring assembly adopts the anti-back pressure structure, and the dynamic ring lining is provided with the anti-push step to prevent the mechanical seal from losing efficacy due to the coming off of the dynamic ring seal ring caused by the pressure change.

Description

Reverse-pressure-prevention wave spring mechanical sealing device

Technical Field

The mechanical sealing device relates to a mechanical sealing device, in particular to a wave spring mechanical sealing device for preventing back pressure.

Background

At present, mechanical seals for pumps for inflammable, explosive, toxic and harmful media are used in the petrochemical industry and the coal chemical industry. In such a case, most of the mechanical seals are in series connection (only one set of elastic elements is arranged between the end face of the medium-side mechanical seal and the end face of the atmospheric-side mechanical seal), when the mechanical seal auxiliary flushing scheme adopts PLAN52 (an auxiliary mechanical seal flushing scheme in which the pressure of the chamber of the medium-side mechanical seal is higher than that of the chamber of the atmospheric-side mechanical seal, and when a medium flows into the chamber of the atmospheric-side mechanical seal from the chamber of the medium-side mechanical seal in a leakage state, the pressure of the chamber of the medium-side mechanical seal is normally higher than that of the chamber of the atmospheric-side mechanical seal, but because of process fluctuation or equipment damage, the pressure of the chamber of the medium-side mechanical seal is lower than that of the chamber of the atmospheric-side mechanical seal, and the atmospheric-side mechanical seal is damaged due to the pressure on both sides of the seal, the direction of the atmospheric-side mechanical seal is changed, and the mechanical seal fails. The production progress is influenced, and even large batches of products are unqualified in severe cases, so that great loss is caused to users.

Disclosure of Invention

Aiming at the defects of a series mechanical sealing device, the utility model provides a back pressure prevention wave spring mechanical sealing device, wherein a static ring adopts a back pressure prevention structure, a static ring retaining ring and a clamp spring are adopted to prevent the static ring from coming off due to pressure change, a moving ring assembly adopts the back pressure prevention structure, and a moving ring lining is provided with a push prevention step to prevent a moving ring sealing ring from coming off due to pressure change to cause mechanical sealing failure.

The concrete technical measures for solving the technical problems are as follows:

a wave spring mechanical sealing device for preventing back pressure is characterized in that: bushing sealing washer 6 is equipped with in the department of the 1 internal diameter of rotating ring bush, spring holder 2 is equipped with in the department of the 1 external diameter of rotating ring bush, rotating ring bush 1 is fixed through holding screw 8 with spring holder 2, wave spring 3 is equipped with on the right side of spring holder 2, throw-out collar 4 is equipped with on wave spring 3's right side, rotating ring 5 is equipped with on throw-out collar 4's right side, rotating ring sealing washer 7 is equipped with between the external diameter of rotating ring bush 1 and rotating ring 5's internal diameter, quiet ring 9 is equipped with on rotating ring 5's right side, quiet ring sealing washer 10 is equipped with in the external diameter department of quiet ring 9, quiet ring retaining ring 11 is equipped with in the left side of quiet ring 9, jump ring 12 is equipped with in the left side of quiet ring retaining ring 11.

The utility model has the beneficial effects that:

the utility model adopts the wave spring as an elastic force compensation part to keep the joint of the mechanical seal end surface (the end surface where the movable ring and the static ring are mutually jointed), the wave spring is formed by welding two metal rings with 3-5 waves in each ring in a butt-joint mode, the wave crest and the wave trough on each metal ring are uniformly distributed, the stress is uniform, the structure is stable, and the stable elastic force can be ensured. The axial dimension of the wave spring is very short, so that the axial dimension of the wave spring mechanical sealing device for preventing back pressure is short, and the use requirement of a pump with a small installation space can be met. The relative position of the movable ring bushing and the spring seat is fixed by the set screws, torque is transmitted, the set screws can adopt different quantities according to different specifications of the mechanical sealing device, and the set screws are mainly designed according to the torque required by the mechanical sealing device. The transmission structure is simple, and the transmission torque is stable. The movable ring assembly adopts an anti-back pressure structure, and the movable ring lining is provided with an anti-push step, so that the movable ring sealing ring can be effectively prevented from being separated due to the pressure change at the two sides of the movable ring. The static ring adopts the structure of preventing back pressure, and the left side of static ring is equipped with the static ring retaining ring, can effectually prevent the static ring because the pressure variation of both sides leads to the problem that the static ring deviates from. The utility model can solve the problem that the mechanical sealing device is invalid due to the fact that the static ring is separated out or the dynamic ring sealing ring is separated out caused by the pressure change of the two sides of the mechanical sealing device. The problem that stable production is difficult to achieve due to the fact that the mechanical sealing device fails due to the fact that the process of a pump of a user is unstable or the pressure on two sides of the mechanical sealing device changes due to the characteristics of medium fluid can be solved, and the effect of driving protection and navigation protection is achieved for long-term stable production of the user.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a schematic view of the overall installation of the present invention;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a schematic view of the construction of the rotating ring bushing of the present invention;

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is a schematic structural diagram of a clamp spring in the utility model;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a schematic view of the wave spring of the present invention;

fig. 10 is a top view of fig. 9.

In the figure: 1 is the rotating ring bush, 2 is the spring holder, 3 is wave spring, 4 is the throw-out collar, 5 is the rotating ring, 6 is the bush sealing washer, 7 is the rotating ring sealing washer, 8 is holding screw, 9 is quiet ring, 10 is quiet ring sealing washer, 11 is quiet ring retainer ring, 12 is the jump ring, 13 is the axle sleeve, 14 is the gland, 15 is the drive pin.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The utility model provides a prevent ripples spring mechanical seal device of back pressure, as shown in fig. 1 and fig. 2, be equipped with bush sealing washer 6 in rotating ring bush 1 internal diameter department, be equipped with spring holder 2 in rotating ring bush 1 external diameter department, rotating ring bush 1 is fixed through holding screw 8 with spring holder 2, wave spring 3 is equipped with on the right side of spring holder 2, push ring 4 is equipped with on wave spring 3's right side, rotating ring 5 is equipped with on push ring 4's right side, rotating ring sealing washer 7 is equipped with between rotating ring bush 1's external diameter and rotating ring 5's internal diameter, static ring 9 is equipped with on rotating ring 5's right side, static ring sealing washer 10 is equipped with in static ring 9's external diameter department, static ring retaining ring 11 is equipped with on static ring 9's left side, jump ring 12 is equipped with in static ring retaining ring 11's left side.

As shown in fig. 3 and 4, the moving ring bushing 1 is mounted on the shaft sleeve 13, the moving ring bushing 1 and the shaft sleeve 13 are sealed by interference fit of the bushing seal ring 6, and the moving ring bushing 1 and the shaft sleeve 13 are fixed by the set screw 8 and transmit torque. The static ring 9 is installed on the gland 14, the static ring 9 and the gland 14 are sealed through the static ring sealing ring 10, the static ring 9 and the gland 14 are connected through the driving pin 15, and the driving pin 15 enables the static ring 9 to be relatively static along with the gland 14 and does not rotate along with the rotation of the static ring. The fixed ring retainer ring 11 and the clamp spring 12, the fixed ring sealing ring 10 and the gland 14 act together to ensure that the axial position of the fixed ring 10 is relatively fixed. The circlip 12 is an open circular metal ring, as shown in fig. 7, the outside diameter of the circlip 12 is 4-5mm larger than the inside diameter of the groove of the gland 14 for installing the circlip 12, and the circlip 12 is installed in the corresponding groove of the gland 14 without being separated by the force generated by the natural deformation of the circlip 12.

The wave spring 3 provides a stable elastic force to act on the push ring 4, and the push ring 4 transmits the elastic force to act on the movable ring 5, so that the movable ring 5 and the static ring 9 can be always stably kept in a joint state without being separated. Because the wave spring 3 is formed by welding the wave crests and the wave crests of the two metal circular rings with the wave crests and the wave troughs in a mode of opposite vertex, as shown in figure 9, the wave crests or the wave troughs on each metal circular ring are uniformly distributed, the elastic force provided by the wave spring 3 is uniform and stable, and the two metal circular rings with the wave crests and the wave troughs can provide large elastic force without too long axial length, so that the required axial size of the wave spring 3 is small, the whole pump has a very short axial size, and the pump can adapt to the application environments of a plurality of pumps with very short axial distances.

The design has on the external diameter of rotating ring bush 1 and prevents pushing away the step, when the left pressure of rotating ring 5 is higher than the pressure on right side, rotating ring sealing washer 7 receives the pressure of right direction, can not separate with rotating ring 5, when the left pressure of rotating ring 5 is higher than the pressure on right side, rotating ring sealing washer 7 receives the pressure of left direction, when rotating ring sealing washer 7 removes the step of preventing pushing away on rotating ring bush 1, prevent pushing away the step and can prevent rotating ring sealing washer 7 and remove left, make rotating ring sealing washer 7 can not break away from the internal diameter of rotating ring 5, rotating ring sealing washer 7 still can receive rotating ring 1 and rotating ring 5's common effort and produce the deformation, play sealed usefulness. Therefore, the problem of failure of the mechanical sealing device caused by the fact that the movable ring sealing ring 7 is separated from the movable ring 5 due to pressure change at two sides of the movable ring 5 is effectively solved, and the effect of long-term stable sealing action required by a user can be well achieved. The spring seat 2 and the movable ring 5 are driven by a transmission lug in the spring seat 2, so that the transmission torque is stable, safe and reliable.

The materials of the moving ring bush 1, the spring seat 2, the push ring 4, the set screw 8, the stationary ring retainer ring 11 and the clamp spring 12 can be selected from 2Cr13, 304, 316 and the like according to the corrosion degree of different pumped fluids. The wave spring 3 can be made of materials such as 17-7PH, 316, Hastelloy C and the like. The sleeve 13, the gland 14, and the drive pin 15 are not members of the present invention, and are members used in cooperation with the present invention.

The mounting size of the utility model conforms to the DIN24960 standard. The mechanical sealing device can be used in a working environment in which the pressure change on two sides of the mechanical sealing device is unstable, or the pressure on one side of the mechanical sealing device cannot be stably higher or lower than that of the mechanical sealing device on the other side for a long time.

Claims

1. A wave spring mechanical sealing device for preventing back pressure is characterized in that: bushing sealing washer (6) are equipped with in rotating ring bush (1) internal diameter department, spring holder (2) are equipped with in rotating ring bush (1) external diameter department, rotating ring bush (1) is fixed through holding screw (8) with spring holder (2), wave spring (3) are equipped with on the right side of spring holder (2), throw-out collar (4) are equipped with on the right side of wave spring (3), rotating ring (5) are equipped with on the right side of throw-out collar (4), rotating ring sealing washer (7) are equipped with between the external diameter of rotating ring bush (1) and the internal diameter of rotating ring (5), quiet ring (9) are equipped with on the right side of rotating ring (5), quiet ring sealing washer (10) are equipped with in the external diameter department of quiet ring (9), quiet ring retaining ring (11) are equipped with in the left side of quiet ring (9), retaining ring (12) are equipped with in the left side of quiet ring (11).