CN211039681U

CN211039681U - Simple mechanical seal

Info

Publication number: CN211039681U
Application number: CN201921837848.4U
Authority: CN
Inventors: 李友宝; 励永平
Original assignee: Ningbo Donglian Mechanical Seal Co ltd
Current assignee: Ningbo Donglian Mechanical Seal Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-07-17
Anticipated expiration: 2029-10-29

Abstract

The utility model provides a simple and easy type mechanical seal belongs to sealing member technical field, include: the rotating shaft comprises a thick shaft part and a thin shaft part, and the thick shaft part and the thin shaft part are transited through a positioning shaft shoulder; a stationary ring; a positioning ring; the movable ring seat is provided with a movable ring groove which is formed in the left end face of the movable ring seat in a concave mode, a spring groove is formed in the right end face of the movable ring seat in a concave mode, and a sealing groove is formed in the right end face of the spring groove in a concave mode; the left side of the movable ring extends out of the movable ring groove and is abutted against the static ring; the spring seat comprises a first ring part, a second ring part and a third ring part, the left end face of the first ring part is abutted against the positioning ring, the second ring part is embedded with the spring groove, a first sealing ring is sleeved outside the second ring part, the first sealing ring is embedded into the sealing groove leftwards, the outer diameter of the third ring part is smaller than that of the sealing groove, and a second sealing ring tightly attached to the thin shaft part is embedded in the inner edge of the spring seat; and the left end and the right end of the pre-tightening spring respectively abut against the spring groove and the left end face of the second ring part.

Description

Simple mechanical seal

Technical Field

The utility model belongs to the technical field of the sealing member, a simple and easy type mechanical seal is related to.

Background

The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to the rotation axis, keeping fit and sliding relatively under the action of fluid pressure and the elasticity (or magnetic force) of a compensation mechanism and the cooperation of auxiliary seal, and is a shaft seal device of rotary machinery.

The current mechanical sealing device comprises a rotating shaft and a static ring seat arranged on the rotating shaft, a static ring, a moving ring and a moving ring seat, wherein the static ring is arranged on the static ring seat, the moving ring is arranged on the moving ring seat, the moving ring seat is fixedly connected with the rotating shaft, one end face of the moving ring is abutted on one end face of the static ring, a spring seat of a spring and a fixed spring is further arranged on the rotating shaft, one end of the spring is abutted on the spring seat, the spring seat is abutted on a transmission seat arranged on the rotating shaft, the transmission seat is fixedly connected with the rotating shaft and the moving ring seat, during operation, the moving ring and the moving ring seat can synchronously rotate along with the rotating shaft, and the moving ring makes friction rotation relative to the static ring.

But have following technical problem simultaneously, traditional mechanical seal spare part is more, and the structure is more complicated, causes mechanical seal dismouting more troublesome, and the difficult maintenance in later stage, and simultaneously, this kind of structure also leads to cost greatly increased.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides a simple mechanical seal with simple structure and convenient disassembly and assembly.

The purpose of the utility model can be realized by the following technical proposal: a simplified mechanical seal, comprising:

the rotating shaft comprises a thick shaft part and a thin shaft part, and the thick shaft part and the thin shaft part are transited through a positioning shaft shoulder;

the static ring is sleeved outside the thick shaft part;

the positioning ring is sleeved outside the thin shaft part and abuts against the positioning shaft shoulder leftwards;

the movable ring seat is sleeved outside the positioning ring, a movable ring groove is formed in the left end face of the movable ring seat in a concave mode, a spring groove is formed in the right end face of the movable ring seat in a concave mode, and a sealing groove is formed along the right end face of the spring groove in a concave mode;

the movable ring is sleeved outside the positioning ring and is embedded into the movable ring groove rightwards, and the left side of the movable ring extends out of the movable ring groove and is abutted against the static ring;

the spring seat is sleeved outside the thin shaft part and comprises a first ring part, a second ring part and a third ring part, the outer diameters of the first ring part, the second ring part and the third ring part are sequentially increased from left to right, the left end face of the first ring part abuts against the positioning ring, the second ring part is embedded into the spring groove, a first sealing ring is sleeved outside the second ring part, the first sealing ring is embedded into the sealing groove leftwards, the outer diameter of the third ring part is smaller than that of the sealing groove, and a second sealing ring tightly attached to the thin shaft part is embedded into the;

the pre-tightening spring is sleeved outside the positioning ring and is embedded into the spring groove leftwards, and the left end and the right end of the pre-tightening spring respectively abut against the spring groove and the left end face of the second ring part;

and the pin shaft radially penetrates through the movable ring seat and is inserted into the second annular part, and the pin shaft is fixedly connected with the movable ring seat.

As a further improvement of the utility model, the cross-sectional width of the static ring is wider than that of the dynamic ring.

As a further improvement of the utility model, the pre-tightening spring is a wave spring.

As a further improvement of the present invention, a movable gap is radially provided between the spring groove and the second annular portion.

As a further improvement, the spring holder right-hand member face evagination is formed with the bulge loop, follows in the bulge loop and laminates with thin axle part, and bulge loop right-hand member face inlays and is equipped with the third sealing washer.

As a further improvement of the utility model, a static sealing ring is sleeved outside the left end of the static ring.

As a further improvement, the utility model provides a spacing hole has been seted up along quiet ring left end, and the radial cartridge in spacing hole has the spacer pin.

Based on the technical scheme, the embodiment of the utility model provides a can produce following technological effect at least:

1. compared with the traditional mechanical seal, the mechanical seal omits a static ring seat and a transmission seat, has fewer parts in the whole structure, simpler structure, small and compact size and convenient and flexible use; the positioning ring is matched with the positioning shaft shoulder, so that the spring seat can be conveniently positioned and installed, and the installation size can be ensured; in addition, the spring seat and the moving ring seat are axially embedded and then radially inserted into the pin shaft, so that the spring seat and the moving ring seat are circumferentially fixed, and the spring seat and the moving ring seat are more convenient to disassemble and assemble.

2. Because the stationary ring is matched with the narrow surface of the movable ring, the stationary ring and the movable ring can form concave-convex matching even if the stationary ring and the movable ring are worn, and the sealing effect is ensured for a long time.

3. The pre-tightening spring is preferably a wave spring, and a shorter pre-tightening spring can be selected on the premise of ensuring the elasticity, so that the structure is more compact.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

In the figure, 100, the rotation axis; 110. a thick shaft portion; 120. a thin shaft part; 130. a shaft shoulder;

200. a stationary ring; 210. a static seal ring; 220. a limiting hole; 230. a spacing pin;

300. a positioning ring;

400. a movable ring seat; 410. a movable ring groove; 420. a spring slot; 430. a sealing groove; 440. A first seal ring; 450. a clearance for movement;

500. a moving ring;

600. a spring seat; 610. a first ring portion; 620. a second ring portion; 630. a third ring portion; 640. a second seal ring; 650. a convex ring; 660. a third seal ring;

700. pre-tightening the spring;

800. and (7) a pin shaft.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 2, the simple mechanical seal includes:

a rotating shaft 100, which comprises a thick shaft part 110 and a thin shaft part 120, wherein the thick shaft part 110 and the thin shaft part 120 are transited by a positioning shoulder 130;

a stationary ring 200 sleeved outside the thick shaft portion 110;

a positioning ring 300, which is sleeved outside the thin shaft part 120 and abuts against the positioning shoulder 130 leftwards;

the movable ring seat 400 is sleeved outside the positioning ring 300, a movable ring groove 410 is formed in the left end face of the movable ring seat 400 in a concave mode, a spring groove 420 is formed in the right end face of the movable ring seat 400 in a concave mode, and a sealing groove 430 is formed in the right end face of the spring groove 420 in a concave mode;

the movable ring 500 is sleeved outside the positioning ring 300 and is embedded into the movable ring groove 410 rightwards, and the left side of the movable ring 500 extends out of the movable ring groove 410 and is abutted against the static ring 200;

the spring seat 600 is sleeved outside the thin shaft part 120, the spring seat 600 comprises a first ring part 610, a second ring part 620 and a third ring part 630, the outer diameters of the first ring part 610, the second ring part 620 and the third ring part 630 are sequentially increased from left to right, the left end face of the first ring part 610 abuts against the positioning ring 300, the second ring part 620 is embedded with the spring groove 420, a first sealing ring 440 is sleeved outside the second ring part 620, the first sealing ring 440 is embedded into the sealing groove 430 leftwards, the outer diameter of the third ring part 630 is smaller than that of the sealing groove 430, and a second sealing ring 640 tightly attached to the thin shaft part;

the pre-tightening spring 700 is sleeved outside the positioning ring 300 and is embedded into the spring groove 420 leftwards, and the left end and the right end of the pre-tightening spring 700 respectively abut against the spring groove 420 and the left end face of the second ring part 620;

the pin shaft 800 radially penetrates through the moving ring seat 400 and is inserted into the second annular portion 620, and the pin shaft 800 is in interference fit with the moving ring seat 400 so that the pin shaft 800 is fixed on the moving ring seat 400.

In this structure, quiet ring 200, spring holder 600 are installed on by the confined container, and pretension spring 700 inlays and adorns in rotating ring seat 400, compare traditional mechanical seal, have left out quiet ring 200 seats and transmission seat, and whole structure spare part is less, and the structure is simpler, and the small and exquisite compactness of size, the nimble use of being convenient for.

The positioning ring 300 is matched with the positioning shaft shoulder 130, so that the spring seat 600 is conveniently positioned and installed, and the installation size is ensured; in addition, the spring seat 600 and the moving ring seat 400 are axially embedded and then radially inserted into the pin shaft 800, so that the spring seat 600 and the moving ring seat 400 are circumferentially fixed, and the spring seat 600 and the moving ring seat 400 are more convenient to disassemble and assemble.

The pre-tightening spring 700 is preferably a wave spring, so that on the premise of ensuring the elasticity, a shorter pre-tightening spring 700 can be selected, and the structure is more compact.

The section width of quiet ring 200 is wider than the section width of rotating ring 500 for quiet ring 200 and rotating ring 500 narrow face cooperation, even above-mentioned both wear and tear also can form unsmooth cooperation, guarantee sealed effect for a long time.

It should be noted that, because the outer diameter of the third ring portion 630 is smaller than the sealing groove 430, the movable seat can slide left and right relative to the spring seat 600, so as to adjust the amount of extension and retraction of the pre-tightening spring 700, and the use is more flexible. Further, a movable gap 450 is radially arranged between the spring groove 420 and the spring seat 600, so that the spring seat 600 is more easily embedded into the movable ring seat 400, the installation is more convenient, and the right end of the movable gap 450 and a sealing ring of the movable ring seat 400 are arranged at intervals to avoid leakage.

In order to ensure the sealing performance, a convex ring 650 is formed by protruding the right end surface of the spring seat 600, the inner edge of the convex ring 650 is attached to the thin shaft part 120, and a third sealing ring 660 is embedded in the right end surface of the convex ring 650. Similarly, the stationary seal ring 210 is sleeved outside the left end of the stationary ring 200.

A limiting hole 220 is formed in the left end of the static ring 200, a limiting pin 230 is radially inserted into the limiting hole 220, the limiting pin 230 can limit the static ring 200 to rotate in the circumferential direction, and the slipping phenomenon is avoided.

During installation, the limit pin 230 can be inserted into the closed container, and then the stationary ring 200 is axially sleeved so that the limit hole 220 is inserted into the limit pin 230, which is convenient to install.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A simplified mechanical seal, comprising:

the static ring is sleeved outside the thick shaft part;

2. A simplified mechanical seal according to claim 1, characterised in that: the section width of the static ring is wider than that of the dynamic ring.

3. A simplified mechanical seal according to claim 1, characterised in that: the pre-tightening spring is a wave spring.

4. A simplified mechanical seal according to claim 1, characterised in that: and a movable gap is radially arranged between the spring groove and the second annular part.

5. A simplified mechanical seal according to claim 1, characterised in that: the right end face of the spring seat is convexly provided with a convex ring, the inner edge of the convex ring is attached to the thin shaft part, and the right end face of the convex ring is embedded with a third sealing ring.

6. A simplified mechanical seal according to claim 1, characterised in that: and a static sealing ring is sleeved outside the left end of the static ring.

7. A simplified mechanical seal according to claim 1, characterised in that: a limiting hole is formed in the left end of the static ring, and a limiting pin is radially inserted into the limiting hole.