A seal device for a shaft

Abstract

The utility model relates to the technical field of shaft seal, provide a kind of shaft seal device, including shaft body and first casing, the outside of the shaft body is equipped with first casing, the outside of the shaft body in first casing side is equipped with second casing.The utility model is provided with sealing structure, under the elastic force of reset spring, the side of moving ring is always closely attached with the side of static ring, to form a sealing surface, prevent fluid or gas along the gap between shaft body and static ring leakage, under the action of first sealing ring, the sealing between moving ring and shaft body is enhanced, under the action of second sealing ring, the sealing between static ring and second casing is enhanced, to effectively prevent internal medium leakage to outside, also prevent external pollutants from entering inside, realize the function that the device is convenient to prevent leakage, to improve the applicability of the shaft seal device when using.

Description

Technical Field

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

[0002] Shaft seals are sealing devices used to prevent fluid leakage between a rotating shaft and its housing. Their core function is to prevent lubricant from leaking from inside the machine and to prevent external contaminants from entering the machine. Therefore, a shaft seal device is used. To address this, patent CN214248290U discloses a multi-stage sealing device for shafts. Its features include a moving disc, a moving shaft sleeve fitted onto the shaft, a stationary disc and a stationary shaft sleeve fixed to the equipment housing, with the moving disc fixed to the moving shaft sleeve. A moving ring is provided inside the moving shaft sleeve, and a stationary ring is provided inside the stationary shaft sleeve. Rubber rings are provided between the moving shaft sleeve and the moving ring, and between the stationary shaft sleeve and the stationary ring. The moving ring moves synchronously with the moving shaft sleeve via the rubber rings; the stationary ring moves synchronously with the stationary shaft sleeve via the rubber rings; the contact surface between the moving ring and the stationary ring is a sliding friction surface. This invention ensures a reliable sealing effect; provides a long service life, avoiding frequent replacement of seals; can be used in harsh environments, has a wide range of applications, is easy to maintain (requiring only periodic lubrication); and has good vibration resistance, being insensitive to vibration, sway, and shaft misalignment relative to the sealing cavity. Although the aforementioned multi-stage shaft sealing device has good vibration resistance and is not sensitive to the vibration, sway, and misalignment of the rotating shaft to the sealing cavity, its poor sealing effect makes it difficult to prevent media leakage along the shaft, resulting in low applicability in use. Utility Model Content

[0003] The purpose of this invention is to provide a shaft sealing device to solve the problem of poor sealing effect of existing shaft sealing devices.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a shaft sealing device, comprising a shaft body and a first housing; A first housing is fitted on the outer side of the shaft, and a second housing is fitted on the outer side of the shaft on one side of the first housing. Fixed bolts are evenly inserted through one side of the first housing and the second housing. A protective structure is provided inside the second housing near the first housing. The protective structure includes a third sealing ring, a placement groove and a cavity. The placement groove is opened inside the second housing near the first housing. The third sealing ring is provided inside the placement groove. The cavity is provided inside the third sealing ring. The main view cross-section of the third sealing ring is annular. Both the first housing and the second housing have a sealing structure inside. The sealing structure includes a fixed seat inside the first housing, a return spring fixed to one side of the fixed seat, a moving ring fixed to one end of the return spring, a stationary ring on one side of the moving ring, a first groove on the outer side of the stationary ring, a second sealing ring inside the first groove, a second groove on the inner side of the moving ring, and a first sealing ring inside the second groove. The main view cross-section of the second sealing ring is a circular strip.

[0005] When using this device, the sealing structure facilitates leakage prevention, thereby improving its applicability in use; the protective structure facilitates sealing, thereby improving its ease of use.

[0006] Preferably, the first housing and the second housing are fixedly connected by fixing bolts.

[0007] Preferably, both ends of the fixed seat are connected by connecting bolts, and the fixed seat and the shaft are fixedly connected by the connecting bolts. The inner side of the first sealing ring is in contact with the outer side of the shaft. Under the elastic force of the return spring, one side of the moving ring is always tightly fitted with one side of the stationary ring, thereby forming a sealing surface to prevent fluid or gas from leaking along the gap between the shaft and the stationary ring.

[0008] Preferably, anti-rotation pins penetrate the interior of the second housing at both ends of the stationary ring, and the stationary ring and the second housing are fixedly connected by the anti-rotation pins. The outer side of the second sealing ring contacts the inner side of the second housing. Under the action of the first sealing ring, the sealing performance between the rotating ring and the shaft is enhanced; under the action of the second sealing ring, the sealing performance between the stationary ring and the second housing is enhanced, thereby effectively preventing internal media from leaking to the outside and preventing external contaminants from entering the interior.

[0009] Preferably, the third sealing ring and the second housing form an engaging structure through a placement groove, with one side of the third sealing ring contacting one side of the first housing. The placement groove fixes the third sealing ring and the second housing together. When the first and second housings are fixed together, the cavity causes the third sealing ring to deform, thus enhancing the seal between the first and second housings.

[0010] The shaft sealing device provided by this utility model has the following advantages: By incorporating a sealing structure, the dynamic ring is always tightly fitted to the stationary ring under the elastic force of the return spring, forming a sealing surface that prevents fluid or gas from leaking through the gap between the shaft and the stationary ring. The first sealing ring enhances the sealing performance between the dynamic ring and the shaft, while the second sealing ring enhances the sealing performance between the stationary ring and the second housing. This effectively prevents internal media from leaking to the outside and also prevents external contaminants from entering the interior, thus enabling the device to easily prevent leakage and improving its applicability in use. By incorporating a protective structure, the third sealing ring and the second housing are fixed together by the placement groove. When the first and second housings are fixed together, the third sealing ring deforms under the action of the cavity. The third sealing ring enhances the sealing performance between the first and second housings, thus realizing the sealing function of the device and improving the convenience of using the shaft sealing device. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the main cross-section of this utility model; Figure 3 This is a three-dimensional exploded cross-sectional view of the sealing structure of this utility model. Figure 4 This is a three-dimensional structural schematic diagram of the protective structure of this utility model, showing the front cross-section after explosion. Figure 5 This is a top-view cross-sectional three-dimensional structural diagram of the present invention.

[0012] The reference numerals in the figure are as follows: 1. Shaft; 2. First housing; 3. Second housing; 4. Fixing bolt; 5. Sealing structure; 501. Stationary ring; 502. Fixing seat; 503. Return spring; 504. Moving ring; 505. First sealing ring; 506. First slot; 507. Second sealing ring; 508. Second slot; 6. Protective structure; 601. Third sealing ring; 602. Placement groove; 603. Cavity. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-5This utility model provides a shaft sealing device, including a shaft body 1 and a first housing 2. The first housing 2 is sleeved on the outer side of the shaft body 1, and a second housing 3 is sleeved on the outer side of the shaft body 1 on one side of the first housing 2. Fixing bolts 4 are evenly inserted through one side of the first housing 2 and the second housing 3. A protective structure 6 is provided inside the second housing 3 on the side near the first housing 2. The protective structure 6 includes a third sealing ring 601, a placement groove 602, and a cavity 603. The placement groove 602 is opened inside the second housing 3 on the side near the first housing 2. The third sealing ring 601 is disposed inside the placement groove 602. The cavity 603 is disposed inside the third sealing ring 601. The main view cross-section of the third sealing ring 601 is annular. The third sealing ring 601 and the second housing 3 form an engaging structure through the placement groove 602. One side of the third sealing ring 601 is in contact with one side of the first housing 2. The first housing 2 and the second housing 3 are fixedly connected by fixing bolts 4.

[0015] Reference Figure 2 and Figure 4 As shown, under the action of the placement groove 602, the third sealing ring 601 and the second housing 3 are fixed to each other. When the first housing 2 and the second housing 3 are fixed to each other by the fixing bolt 4, the third sealing ring 601 is deformed under the action of the cavity 603. Under the action of the third sealing ring 601, the sealing between the first housing 2 and the second housing 3 is enhanced.

[0016] Both the first housing 2 and the second housing 3 are equipped with a sealing structure 5. The sealing structure 5 includes a fixed base 502 disposed inside the first housing 2. A return spring 503 is fixed to one side of the fixed base 502. A moving ring 504 is fixed to one end of the return spring 503. A stationary ring 501 is disposed on one side of the moving ring 504. A first slot 506 is formed on the outer side of the stationary ring 501. A second sealing ring 507 is disposed inside the first slot 506. A second slot 508 is formed on the inner side of the moving ring 504. The groove 508 is provided with a first sealing ring 505 and a second sealing ring 507 with a circular cross-section. Both ends of the fixed seat 502 are provided with connecting bolts. The fixed seat 502 and the shaft 1 are fixedly connected by the connecting bolts. The inner side of the first sealing ring 505 is in contact with the outer side of the shaft 1. The second housing 3 at both ends of the stationary ring 501 is provided with anti-rotation pins. The stationary ring 501 and the second housing 3 are fixedly connected by anti-rotation pins. The outer side of the second sealing ring 507 is in contact with the inner side of the second housing 3.

[0017] Reference Figure 2 and Figure 3As shown, the rotating ring 504 is connected to the shaft 1 via the fixed seat 502 and rotates together with the shaft 1. Under the elastic force of the return spring 503, one side of the rotating ring 504 is always tightly fitted with one side of the stationary ring 501, thereby forming a sealing surface to prevent fluid or gas from leaking along the gap between the shaft 1 and the stationary ring 501. Under the action of the first sealing ring 505, the sealing performance between the rotating ring 504 and the shaft 1 is enhanced. Under the action of the second sealing ring 507, the sealing performance between the stationary ring 501 and the second housing 3 is enhanced, thereby effectively preventing the internal medium from leaking to the outside and preventing external contaminants from entering the interior.

[0018] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shaft sealing device, comprising a shaft body (1) and a first housing (2); Its features are: The outer side of the shaft (1) is fitted with a first housing (2), and the outer side of the shaft (1) on one side of the first housing (2) is fitted with a second housing (3). Fixing bolts (4) are uniformly inserted through one side of the first housing (2) and the second housing (3). A protective structure (6) is provided inside the second housing (3) on the side close to the first housing (2). The protective structure (6) includes a third sealing ring (601), a placement groove (602) and a cavity (603). The placement groove (602) is opened inside the second housing (3) on the side close to the first housing (2). The third sealing ring (601) is provided inside the placement groove (602). The cavity (603) is provided inside the third sealing ring (601). The main view cross section of the third sealing ring (601) is circular. Both the first housing (2) and the second housing (3) are provided with a sealing structure (5). The sealing structure (5) includes a fixed seat (502) disposed inside the first housing (2). A return spring (503) is fixed on one side of the fixed seat (502). A moving ring (504) is fixed on one end of the return spring (503). A stationary ring (501) is disposed on one side of the moving ring (504). A first slot (506) is opened on the outer side of the stationary ring (501). A second sealing ring (507) is disposed inside the first slot (506). A second slot (508) is opened on the inner side of the moving ring (504). A first sealing ring (505) is disposed inside the second slot (508). The main view cross section of the second sealing ring (507) is circular.

2. The shaft sealing device according to claim 1, characterized in that: The first housing (2) and the second housing (3) are fixedly connected by fixing bolts (4).

3. A shaft sealing device according to claim 1, characterized in that: Both ends of the fixed seat (502) are connected by connecting bolts. The fixed seat (502) and the shaft (1) are fixedly connected by the connecting bolts. The inner side of the first sealing ring (505) is in contact with the outer side of the shaft (1).

4. A shaft sealing device according to claim 1, characterized in that: Anti-rotation pins are inserted through the interior of the second housing (3) at both ends of the stationary ring (501). The stationary ring (501) and the second housing (3) are fixedly connected by the anti-rotation pins. The outer side of the second sealing ring (507) is in contact with the inner side of the second housing (3).

5. A shaft sealing device according to claim 1, characterized in that: The third sealing ring (601) and the second housing (3) form an engaging structure through the placement groove (602), with one side of the third sealing ring (601) in contact with one side of the first housing (2).

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