Compact mechanical sealing structure

Abstract

The utility model belongs to the technical field of sealing, and particularly relates to a compact mechanical sealing structure which comprises a shaft sleeve, a movable ring assembly, a spring and a static ring, the movable ring assembly is composed of a movable ring and a movable ring seat, and the movable ring is embedded in a matching hole of the movable ring seat in an interference mode; the shaft sleeve is provided with a shoulder, and anti-rotation pins are evenly distributed on the end face of one side of the shoulder and matched with the U-shaped anti-rotation groove of the movable ring assembly; one end of the spring is mounted in the counter bore of the moving ring seat, and the other end of the spring abuts against the end face, provided with the anti-rotating pin, of the shaft sleeve; the static ring is fixed on the pump body through a gland and is sealed with the end face of the moving ring. The radial space integrated design of the shaft sleeve and the movable ring seat is fully utilized, the radial size of the shaft sleeve is fully utilized, the shoulder is arranged for arranging the anti-rotating pin and the positioning spring, and the movable ring assembly assists the sealing ring to be limited through the check ring and the clamp spring. The sealing structure is suitable for sealing cavities with small radial sizes, is most suitable for occasions where packing sealing is modified, and is good in sealing effect and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing, and in particular relates to a compact mechanical sealing structure. Background Art

[0002] When retrofitting mechanical seals for cavities using packing seals, the smaller radial dimensions often preclude the use of standard, non-cartridge-type mechanical seals. Directly mounting the dynamic ring assembly on the pump shaft prevents the drive seat from being securely fastened, forcing the use of an externally mounted structure. This arrangement creates an outflow and is prone to seal leakage, making it unsuitable. The key to solving sealing problems in these cavities lies in minimizing radial space while also designing a shaft protection sleeve and ensuring an integrated seal layout. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a compact mechanical seal structure suitable for the cavity of packing seal, including a sleeve, a dynamic ring assembly, a spring and a static ring, wherein:

[0004] The dynamic ring assembly consists of a dynamic ring and a dynamic ring seat. The dynamic ring is interference-fitted into the matching hole of the dynamic ring seat. The dynamic ring seat is circumferentially provided with countersunk holes for positioning the spring, and the countersunk holes are clearance-matched with the outer diameter of the spring. The dynamic ring seat is circumferentially provided with U-shaped anti-rotation grooves for preventing the dynamic ring assembly from rotating, and the anti-rotation grooves are spaced apart from the countersunk holes.

[0005] The shaft sleeve is provided with a shoulder, and anti-rotation pins are evenly distributed on the end surface of one side of the shoulder. The anti-rotation pins cooperate with the U-shaped anti-rotation groove of the dynamic ring assembly to prevent the dynamic ring assembly from rotating; the inner hole of the shaft sleeve cooperates with the pump shaft and rotates together with the pump shaft through the set screw to prevent rotation;

[0006] The spring has one end installed in the countersunk hole of the dynamic ring seat and the other end abuts against the end surface of the anti-rotation pin of the sleeve. The spring provides elastic compensation for the dynamic ring assembly;

[0007] The static ring is fixed to the pump body by the gland and seals with the end face of the dynamic ring.

[0008] Furthermore, a dynamic ring sealing ring is provided between the outer circle on one side of the shoulder and the dynamic ring seat for auxiliary sealing of the dynamic ring assembly and the shaft sleeve, and the outer circle on the other side of the shoulder contacts and cooperates with the transmission ring to transmit the rotational torque.

[0009] Furthermore, a retaining ring and a retaining spring are respectively provided on both sides of the dynamic ring seal to limit its position.

[0010] Furthermore, a static ring sealing ring is provided between the static ring and the pressure cover.

[0011] Furthermore, a circle of grooves is provided on the inner diameter surface of the shaft sleeve, and a shaft sleeve sealing ring is provided in the groove to achieve sealing between the shaft sleeve and the shaft.

[0012] This new design fully utilizes the radial space between the sleeve and the dynamic ring seat, creating an integrated design that fully utilizes the sleeve's radial dimensions. A shoulder is provided for accommodating the anti-rotation pin and positioning spring, while the dynamic ring assembly's auxiliary seal is retained by a retaining ring and retaining spring. This structural seal is suitable for sealing cavities with small radial dimensions and is ideal for packing seal modifications, offering excellent sealing performance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is a structural diagram of the dynamic ring.

[0015] Among them, 1. Shaft sleeve sealing ring; 2. Circlip; 3. Dynamic ring sealing ring; 4. Retaining ring; 5. Shaft sleeve; 6. Anti-rotation pin; 7. Dynamic ring assembly; 701. Dynamic ring; 702. Dynamic ring seat; 8. Static ring; 9. Static ring sealing ring; 10. Spring; 11. Pressure cover. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0017] Mechanical seals are superior to packing seals in terms of energy consumption and operational stability. When operating conditions permit, converting packing seals into mechanical seals is inevitable. This utility model fully considers structural and processing manufacturability, and when radial seal space permits, converts the packing seal into a mechanical seal to ensure stable shaft seal operation.

[0018] like Figure 1 As shown, the utility model belongs to the category of mechanical seals and is a mechanical seal structure suitable for flushing scheme Plan 11. It is mainly aimed at solving the problem of small radial space and the need to design a protective sleeve for mechanical seals. This seal is a balanced structure. The dynamic ring anti-rotation pin 6 is axially arranged on the sleeve 5, and the spring 10 is arranged on the dynamic ring assembly 7, which compresses the design size of the radial space to the maximum extent. This structure can meet the use requirements of mechanical seals in pump chambers with narrow radial space. Specifically, a compact mechanical seal structure suitable for flushing scheme Plan 11 is provided, including: a sleeve, a dynamic ring assembly 7, a spring and a static ring 8, wherein,

[0019] refer to Figure 2The dynamic ring assembly 7 consists of a dynamic ring 701 and a dynamic ring seat 702. The dynamic ring 701 is interference-fitted into the mating hole of the dynamic ring seat 702. The dynamic ring seat 702 is circumferentially arranged with counterbores for locating the spring 10, which have a clearance fit within the outer diameter of the spring 10. U-shaped anti-rotation grooves are evenly distributed around the circumference of the dynamic ring seat 702 to prevent the dynamic ring assembly 7 from rotating. The dynamic ring seal 3 is retained by a retaining ring 4 and a retaining ring 2 and is mounted on the dynamic ring assembly 7.

[0020] The sleeve 5 has a shoulder, with anti-rotation pins 6 distributed uniformly on one end of the shoulder. These pins engage with the U-shaped anti-rotation grooves of the dynamic ring assembly 7 to prevent rotation. The sleeve 5's inner bore mates with the pump shaft, and the set screws prevent rotation, rotating with the pump shaft. The outer diameter of one side of the shoulder engages with the dynamic ring seal 3, providing auxiliary sealing between the dynamic ring assembly 7 and the sleeve 5. The outer diameter of the other side of the shoulder engages with the dynamic ring 701 to transmit rotational torque. A groove is formed on the inner diameter of the sleeve 5, and the sleeve seal 1 is installed in the groove to achieve a seal between the sleeve 5 and the shaft.

[0021] One end of spring 10 is mounted in the countersunk hole of dynamic ring seat 702, while the other end abuts the end surface of sleeve 5 where anti-rotation pin 6 is mounted. Spring 10 provides elastic compensation for dynamic ring assembly 7. The dynamic ring friction pair rotates in conjunction with the static ring friction pair. Static ring 8 is mounted within gland 11, with a secondary seal provided by static ring sealing ring 9. During operation, dynamic ring assembly 7 rotates with the pump shaft, while gland 11 secures static ring 8 to the pump body. The friction pair provides a dynamic seal, while the auxiliary O-ring provides a static seal, ensuring leakage of the medium.

[0022] The installation sequence of the utility model is: clean the pump shaft, install the container seal in the sealing cavity, tighten the set screws, remove the positioning block, connect the flushing pipeline, empty the gas in the pipeline, turn the machine for inspection, and then operate the equipment.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compact mechanical seal structure, characterized in that: Including, shaft sleeve, dynamic ring assembly, spring and static ring, among which, The dynamic ring assembly consists of a dynamic ring and a dynamic ring seat. The dynamic ring is interference-fitted into the matching hole of the dynamic ring seat. The dynamic ring seat is circumferentially provided with countersunk holes for positioning the spring, and the countersunk holes are clearance-matched with the outer diameter of the spring. The dynamic ring seat is circumferentially provided with U-shaped anti-rotation grooves for preventing the dynamic ring assembly from rotating, and the anti-rotation grooves are spaced apart from the countersunk holes. The shaft sleeve is provided with a shoulder, and anti-rotation pins are evenly distributed on the end surface of one side of the shoulder. The anti-rotation pins cooperate with the U-shaped anti-rotation groove of the dynamic ring assembly to prevent the dynamic ring assembly from rotating; the inner hole of the shaft sleeve cooperates with the pump shaft and rotates together with the pump shaft through the set screw to prevent rotation; The spring has one end mounted in the countersunk hole of the dynamic ring seat and the other end abutting against the end surface of the anti-rotation pin of the sleeve; The static ring is fixed to the pump body by the gland.

2. A compact mechanical seal structure according to claim 1, characterized in that: A dynamic ring sealing ring is provided between the outer circle on one side of the shoulder and the dynamic ring seat for auxiliary sealing of the dynamic ring assembly and the shaft sleeve. The outer circle on the other side of the shoulder contacts and cooperates with the transmission ring to transmit the rotational torque.

3. A compact mechanical seal structure according to claim 1, characterized in that: A retaining ring and a retaining spring are respectively provided on both sides of the dynamic ring seal to limit its position.

4. A compact mechanical seal structure according to claim 1, characterized in that: A static ring sealing ring is provided between the static ring and the pressure cover.

5. A compact mechanical seal structure according to claim 1, characterized in that: A circle of grooves is set on the inner diameter surface of the sleeve, and a sleeve sealing ring is set in the groove to achieve sealing between the sleeve and the shaft.

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