Mechanical shaft seal device

Abstract

The utility model relates to the technical field of shaft sealing, in particular to a mechanical shaft sealing device. A mechanical shaft seal device comprises a static ring, a movable ring, a positioning ring and a plurality of small springs located between the positioning ring and the movable ring, a plurality of limiting pins are arranged between the positioning ring and the movable ring, limiting pin sliding holes are formed in the positioning ring, through holes corresponding to the small springs one to one are formed in the positioning ring, and the rear ends of the small springs are located in the through holes. And a detachable plugging device is arranged on the through hole. The plugging device comprises a screw, and the rear end of the through hole is an inner threaded hole I matched with the screw. The plugging device comprises two semicircular rings, and jacking columns corresponding to the through holes are arranged on the semicircular rings. Inner threaded holes II are formed in the rear ends of one or more limiting pin sliding holes, and fastening screws are matched with the inner threaded holes II. After the small spring is deformed, the small spring can be quickly replaced, so that the equipment maintenance cost of an enterprise is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of shaft sealing technology, specifically a mechanical shaft sealing device. Background Technology

[0002] A mechanical shaft seal is a device used to seal the connection between a rotating shaft and the machine body. The basic components of a mechanical shaft seal include a stationary ring, a rotating ring, an elastic element, a locating ring, a rotating ring seal, and a stationary ring seal. Based on the type of elastic element, mechanical shaft seals are classified into multi-spring, large-spring, and wave spring types. Large-spring and wave spring types offer greater elasticity and have a lower failure rate, but their pressure on the entire rotating ring is not as uniform as that of multi-spring types. Even a slight imbalance in compression can lead to water or oil leaks, thus requiring strict installation. While multi-spring types offer better compensation for the rotating ring, the individual small springs are prone to deformation in harsh environments, resulting in decreased elasticity and water or oil leaks. In such cases, the end-face sealing material of the mechanical shaft seal may not be completely worn out. Replacing the entire mechanical shaft seal is wasteful and requires disassembling the equipment's couplings, which is time-consuming and labor-intensive. Utility Model Content

[0003] To address the shortcomings of the existing technology, this utility model provides a mechanical shaft seal device that allows for the quick replacement of small springs after they become deformed.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A mechanical shaft sealing device includes a stationary ring, a rotating ring, a positioning ring, and several small springs located between the positioning ring and the rotating ring. Several limiting pins are provided between the positioning ring and the rotating ring. The positioning ring is provided with sliding holes for the limiting pins. Through holes are provided on the positioning ring corresponding to the small springs one by one. The rear end of each small spring is located in the through hole. A detachable sealing device is provided on the through hole.

[0006] Furthermore, the sealing device includes a screw, and the rear end of the through hole is an internally threaded hole I that mates with the screw.

[0007] Furthermore, the sealing device includes two semicircular rings, and a top post corresponding to the through hole is provided on the semicircular ring; the semicircular ring and the positioning ring are fixedly connected by fastening screws.

[0008] Furthermore, an internally threaded hole II is provided at the rear end of one or more limit pin sliding holes, and the fastening screw engages with the internally threaded hole II.

[0009] Furthermore, the positioning ring is provided with grooves corresponding to the two semicircular rings.

[0010] Furthermore, a semi-circular threaded groove is provided on the mating edge of the two semi-circular rings, and an inclined surface is provided on the outer edge of the semi-circular threaded groove; after the two semi-circular rings are mated, the two semi-circular threaded grooves are mated to form a threaded hole; the screw head of the fastening screw is provided with a pressure surface that mates with the inclined surface of the semi-circular threaded groove.

[0011] The beneficial effects of this utility model are:

[0012] It allows for the removal and replacement of small springs through a detachable sealing device, reducing enterprise costs. Moreover, it does not require the coupling to be removed, making operation quick and convenient, and greatly reducing the enterprise's equipment maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention (second embodiment of the sealing device);

[0014] Figure 2 This is a top view schematic diagram of the present invention (second embodiment of the sealing device);

[0015] Figure 3 For along Figure 2 Schematic diagram of the cross section of line AA;

[0016] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0017] Figure 5 This is a schematic diagram of the overall structure of the first embodiment of the sealing device of this utility model;

[0018] In the figure, there are: stationary ring 1, moving ring 2, positioning ring 3, limit pin sliding hole 301, through hole 302, fixing screw 303, through hole I 304, countersunk groove 305, small spring 4, limit pin 5, screw 6, semi-circular ring 7, top post 701, semi-circular threaded groove 702, and fastening screw 8. Detailed Implementation

[0019] To better understand this utility model, the following description is in conjunction with the appendix. Figure 1-5 The embodiments of this utility model will be explained in detail below.

[0020] It should be noted that other components of the mechanical shaft sealing device of this utility model, such as sealing rings and positioning pins, are not described in detail. These are common knowledge to those skilled in the art, and therefore will not be elaborated upon.

[0021] The mechanical shaft sealing device of this utility model is a multi-spring type, which includes a stationary ring 1, a moving ring 2, a positioning ring 3, and several small springs 4 located between the positioning ring 3 and the moving ring 2. Several springs 4 (such as...) pass between the positioning ring 3 and the moving ring 2. Figure 1The diagram shows three limiting pins 5 connected together. The bottom of each limiting pin 5 is fixedly connected to the moving ring 2. A limiting pin sliding hole 301 is provided on the positioning ring 3. Three fixing screws 303, which are fixed to the rotating shaft, are provided radially on the positioning ring 3. Through holes 302 (or through holes I 304) are provided on the positioning ring 3 corresponding to the small springs 4. Figure 1 The diagram shows 12 through holes 302, and 12 small springs 4 are provided accordingly. The rear end of each small spring 4 is located inside the through hole 302. A detachable sealing device is provided on the through hole 302 to seal the rear end of each small spring 4. The front end of each small spring 4 rests against the moving ring 2.

[0022] As a first embodiment of the sealing device, such as Figure 5 As shown: The sealing device includes a screw 6, the rear end of the through hole I 304 is an internally threaded hole I that mates with the screw 6, and the rear end of the through hole I 304 is provided with a countersunk groove that mates with the screw head of the screw 6.

[0023] As a first embodiment of the sealing device, such as Figure 1-4 As shown: The sealing device includes two semicircular rings 7, as... Figure 1 As shown, two semicircular rings 7 can be joined together to form a complete circular ring. A top post 701 corresponding to the through hole 302 is provided on each semicircular ring 7. The semicircular ring 7 and the positioning ring 3 are fixedly connected by fastening screws 8.

[0024] To reduce the number of holes required, an internally threaded hole II is provided at the rear end of one or more limit pin sliding holes 301, and the fastening screw 8 mates with the internally threaded hole II. The number of limit pin sliding holes 301 with internally threaded holes II can be determined by those skilled in the art based on the specific dimensions of the mechanical shaft seal.

[0025] For aesthetic purposes and secure installation, a groove 305 corresponding to the two semicircular rings 7 is provided on the positioning ring 3, and the depth of the groove 305 is the same as the height of the semicircular ring 7.

[0026] A semi-circular threaded groove 702 is provided on the mating edge of the two semi-circular rings 7, and an inclined surface is provided on the outer edge of the semi-circular threaded groove 702. After the two semi-circular rings 7 are mated, the two semi-circular threaded grooves 702 are mated to form a threaded hole. The screw head of the fastening screw 8 is provided with a pressure surface that mates with the inclined surface of the semi-circular threaded groove (i.e., the screw head of the fastening screw 8 is a conical surface).

[0027] During installation, first install the semi-circular ring 7 or screw 6, then install the mechanical shaft seal on the shaft according to the standard procedure. If the small spring 4 needs to be replaced, the mechanical shaft seal does not need to be removed from the shaft, nor do components such as the coupling need to be removed. Simply remove the semi-circular ring 7 or screw 6 to take out the old small spring 4 and replace it with the new small spring.

[0028] It should be noted that the number of limit pins 5, through holes 302, fixing screws 303, through holes I 304, fastening screws 8, etc. in this application is not limited to those shown in the drawings. Those skilled in the art can set them arbitrarily according to the size and model of the mechanical shaft seal.

Claims

1. A mechanical shaft sealing device, comprising a stationary ring, a rotating ring, a positioning ring, and a plurality of small springs located between the positioning ring and the rotating ring, wherein a plurality of limiting pins are provided between the positioning ring and the rotating ring, and a limiting pin sliding hole is provided on the positioning ring, characterized in that: A through hole is arranged on the positioning ring corresponding to the small spring, the rear end of the small spring is located in the through hole, and a detachable blocking device is arranged on the through hole.

2. A mechanical shaft seal apparatus as claimed in claim 1, wherein: The blocking device comprises a screw, and the rear end of the through hole is an internally threaded hole I matched with the screw.

3. A mechanical shaft seal assembly as claimed in claim 1, wherein: The blocking device comprises two half rings, a jacking post corresponding to the through hole is arranged on the half ring, and the half ring is fixedly connected with the positioning ring through a fastening screw.

4. A mechanical shaft seal apparatus as claimed in claim 3, wherein: An internally threaded hole II is arranged at the rear end of one or more limiting pin sliding holes, and the fastening screw is matched with the internally threaded hole II.

5. A mechanical shaft seal apparatus as claimed in claim 3 or 4, wherein: A sink groove corresponding to the two half rings is arranged on the positioning ring.

6. A mechanical shaft seal apparatus as claimed in claim 5, wherein: A half circular threaded groove is arranged on the abutting edge of the two half rings, an inclined surface is arranged on the outer edge of the half circular threaded groove, the two half circular threaded grooves are abutted to form a threaded hole after the two half rings are abutted, and the screw head of the fastening screw is provided with a pressing surface matched with the inclined surface of the half circular threaded groove.

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