A completely split cartridge mechanical seal structure

Abstract

The present invention discloses a completely split assembled mechanical seal structure, comprising a left half sealing component and a right half sealing component which cooperate with each other to form an annular seal, the left half sealing component and the right half sealing component being threadedly connected by more than one radial pressure cover bolts, the right half sealing component having the same structure as the left half sealing component and being only symmetrically arranged, the right half sealing component comprising a right pressure cover and a right half bearing which cooperate with each other, a first half sealing ring being arranged on the inner side of the right half bearing, a right half static ring and a right half dynamic ring which cooperate with each other being arranged between the right pressure cover and the right half bearing, the upper end of the right half static ring being abutted against the right pressure cover, the lower end of the right half static ring being abutted against the right half dynamic ring, a second half sealing ring being arranged between the right half static ring and the right pressure cover, and a third half sealing ring being arranged between the right half dynamic ring and the right half bearing; the structure is easy to install.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing structures, and in particular to a completely split cartridge-type mechanical sealing structure, which is functionally used as a rotary shaft sealing device for a pump device under pressure. Background Art

[0002] Mechanical seal structures have been used to provide a fluid seal between a rotatable shaft and a fluid containing chamber. Thus, mechanical seal structures are used in the sealing of rotating shafts of pump equipment under pressure, in which application the mechanical seal structure is generally located where the rotatable shaft enters or exits the housing and is mounted to the housing and the rotatable shaft to provide a seal between those components. Such mechanical seal structures generally include some components that rotate about the shaft and those components that are mounted to the fixed part of the equipment. At the interface between these rotating and fixed components are contacting sealing surfaces; one rotates and the other is fixed. These sealing surfaces are in relative relationship and are configured to be forced into contact to form a fluid seal between them.

[0003] At present, these sealing structures are generally completed with an integrated annular sealing structure. The integrated structure has high space requirements for installation operations during the installation process and requires a relatively large installation space. At the same time, the installation process is time-consuming. In order to ensure the final sealing during the installation process, the size of the product cannot be too large, and it must be ensured that it can be smoothly inserted into the outside of the shaft, which ultimately leads to relatively complicated installation. In addition, if the sealing structure needs to be disassembled later, it is necessary to disassemble large components such as internal bearings, reducers, and motors, and then replace or repair the sealing structure, which greatly increases the time and cost of equipment disassembly and maintenance, so it needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a completely split cartridge mechanical seal structure to solve the problems of complex installation and high subsequent disassembly and maintenance costs mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: A fully split and assembled mechanical seal structure, comprising a left half seal component and a right half seal component that cooperate to form an annular seal. The left half seal component and the right half seal component are of C-shaped structure. The left half seal component and the right half seal component are threadedly connected by more than one radial gland bolt. The right half seal component includes a right gland and a right half bearing that cooperate with each other. A first half seal ring is provided inside the right half bearing. A right half stationary ring and a right half rotating ring that cooperate with each other are provided between the right gland and the right half bearing. The upper end of the right half stationary ring abuts against the right gland, and the lower end of the right half stationary ring abuts against the right half rotating ring. A second half seal ring is provided between the right half stationary ring and the right gland. A third half seal ring is provided between the right half rotating ring and the right half bearing. The left half seal component includes a left gland and a left half bearing that cooperate with each other. A fourth half seal ring is provided inside the left half bearing. A left half stationary ring and a left half rotating ring that cooperate with each other are provided between the left gland and the left half bearing. The upper end of the left half stationary ring abuts against the left gland, and the lower end of the left half stationary ring abuts against the left half rotating ring. A fifth half seal ring is provided between the left half stationary ring and the left gland. A sixth half seal ring is provided between the left half rotating ring and the left half bearing. The sixth half seal ring cooperates with the third half seal ring, and the fifth half seal ring cooperates with the second half seal ring. Half gaskets that cooperate with each other to form a complete gasket are further provided on the lower surfaces of the right gland and the left gland.

[0006] Preferably, to improve the sealing performance, the left half seal component and the right half seal component are mirror images of each other. A first groove extending along the inner wall of the right gland is provided on the inner wall of the right gland. The longitudinal section of the first groove is a "匚"-shaped structure. A first stepped groove extending along the inner wall of the right gland is provided above the first groove. The longitudinal section of the first stepped groove is a two-step structure. A second groove extending along the outer wall of the right half bearing is provided on the outer wall of the right half bearing. The longitudinal section of the second groove is a "匚"-shaped structure. A first arc-shaped baffle extending upward along the groove wall of the second groove is provided at the lower port of the second groove. The right half stationary ring and the right half rotating ring are arranged in the accommodation cavity formed by the first arc-shaped baffle and the second groove.

[0007] Preferably, in order to improve the sealing performance, the right half moving ring is of a letter-shaped structure, and the outer wall portion of the second transverse plate on the right half moving ring abuts against the inner wall of the first arc-shaped baffle plate, and the first arc-shaped baffle plate, the right half static ring and the second groove cooperate to form a first sealing cavity for accommodating the third half sealing ring, the longitudinal section of the right half static ring is of an L-shaped structure, the first transverse plate on the right half static ring is provided with a second arc-shaped baffle abutting against the upper surface of the second transverse plate on the right half moving ring, the first stepped groove includes a lower step located below and an upper step located above, the lower step includes a first vertical table surface and a first horizontal table surface, the upper step includes a second vertical table surface and a second horizontal table surface, the outer wall portion of the first transverse plate abuts against the inner wall of the first vertical table surface, the outer wall portion of the first longitudinal plate on the right half static ring abuts against the inner wall of the second vertical table surface, and the upper end of the first longitudinal plate abuts against the second horizontal table surface, and the outer wall of the first longitudinal plate and the inner wall of the second vertical table surface also constitute a second sealing cavity for accommodating the second half sealing ring.

[0008] Preferably, in order to improve the locking effect and further enhance the sealing performance, the right gland and the right half bearing are fixed by side radial bearing bolts.

[0009] Preferably, in order to improve the locking effect and further improve the sealing performance, a first mounting notch is provided on the right side of the right pressure cover, and more than one radial pressure cover bolt is provided on the first mounting notch. After the radial pressure cover bolt passes through the first mounting notch, it is threadedly connected to the right side of the left pressure cover. A second mounting notch is provided on the left side of the left pressure cover, and more than one radial pressure cover bolt is provided on the second mounting notch. After the radial pressure cover bolt passes through the second mounting notch, it is threadedly connected to the left side of the right pressure cover.

[0010] Preferably, in order to improve the locking effect and further improve the sealing performance, the upper and lower sides of the right half bearing and the left half bearing are fixedly connected by a radial locking ring bolt.

[0011] Preferably, in order to improve the overall strength, the right gland and the left gland include raw materials in the following proportions: 20-30 parts of 316 stainless steel, 5-10 parts of silicon carbide, and 1-4 parts of graphite. The above-mentioned half-side sealing rings are made of fluororubber.

[0012] The technical effect of a completely split container-type mechanical seal structure obtained by the present invention is: it has the characteristics of container-type splitting, because the existing integrated type is converted into two split structures that are symmetrically matched on the left and right, and then can be restored to form a complete container-type seal after being tightened by the radial pressure cover bolts 19, so that the entire installation is simple and no special tools are required; at the same time, the entire seal can be pressure-tested in the later stage to ensure the sealing reliability and startup stability, so that the present structure can directly complete the replacement of the mechanical seal without disassembling large components such as bearings, reducers, motors, etc., and can continuously ensure the rotary shaft seal sealing of the pump equipment, greatly reducing the time and cost of equipment disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a completely split cartridge mechanical seal structure in Example 1 when the left half sealing component and the right half sealing component are separated;

[0014] Figure 2 yes Figure 1 The structural diagram of the sealing component on the middle right half;

[0015] Figure 3 yes Figure 1 A structural stereogram of the left half of the sealing component when viewed from right to left after removing the right half of the sealing component;

[0016] Figure 4 yes Figure 2 A three-dimensional diagram of the structure of the right half of the sealing component when viewed from right to left.

[0017] In the accompanying drawings: left half sealing component 1, right half sealing component 2, right gland 2-1, right half bearing 2-2, first half sealing ring 2-3, right half static ring 2-4, right half dynamic ring 2-5, second half sealing ring 2-6, third half sealing ring 2-7, left gland 1-1, left half bearing 1-2, fourth half sealing ring 1-3, left half static ring 1-4, left half dynamic ring 1-5, fifth half sealing ring 1-6, sixth half Edge sealing ring 1-7, first groove 3, first stepped groove 4, second groove 5, first arc-shaped baffle 6, first sealing cavity 7, second arc-shaped baffle 8, first horizontal plate 9, lower step 11, upper step 12, first vertical table 11-1, first horizontal table 11-2, first installation notch 13, second installation notch 14, radial locking ring bolt 15, second sealing cavity 16, radial bearing bolt 17, half gasket 18, radial pressure cover bolt 19. DETAILED DESCRIPTION

[0018] Embodiment 1:

[0019] like Figure 1-4As shown in the figure, this embodiment provides a fully disassembled and assembled mechanical seal structure, which includes a left half seal component 1 and a right half seal component 2 that cooperate with each other to form an annular seal. The left half seal component 1 and the right half seal component 2 are of C-shaped structure. The left half seal component 1 and the right half seal component 2 are threadedly connected by more than one radial gland bolt 19. The right half seal component 2 includes a right gland 2-1 and a right half bearing 2-2 that cooperate with each other. A first half seal ring 2-3 is arranged inside the right half bearing 2-2. A right half stationary ring 2-4 and a right half rotating ring 2-5 that cooperate with each other are arranged between the right gland 2-1 and the right half bearing 2-2. The upper end of the right half stationary ring 2-4 abuts against the right gland 2-1, and the lower end of the right half stationary ring 2-4 abuts against the right half rotating ring 2-5. A second half seal ring 2-6 is arranged between the right half stationary ring 2-4 and the right gland 2-1. A third half seal ring 2-7 is arranged between the right half rotating ring 2-5 and the right half bearing 2-2. The left half seal component 1 includes a left gland 1-1 and a left half bearing 1-2 that cooperate with each other. A fourth half seal ring 1-3 is arranged inside the left half bearing 1-2. A left half stationary ring 1-4 and a left half rotating ring 1-5 that cooperate with each other are arranged between the left gland 1-1 and the left half bearing 1-2. The upper end of the left half stationary ring 1-4 abuts against the left gland 1-1, and the lower end of the left half stationary ring 1-4 abuts against the left half rotating ring 1-5. A fifth half seal ring 1-6 is arranged between the left half stationary ring 1-4 and the left gland 1-1. A sixth half seal ring 1-7 is arranged between the left half rotating ring 1-5 and the left half bearing 1-2. The sixth half seal ring 1-7 cooperates with the third half seal ring 2-7, and the fifth half seal ring 1-6 cooperates with the second half seal ring 2-6. Half gaskets 18 that cooperate with each other to form a complete gasket are also arranged on the lower surfaces of the right gland 2-1 and the left gland 1-1.

[0020] Preferably, in order to improve the sealing performance, the left half seal component 1 and the right half seal component 2 are mirror images of each other. A first groove 3 extending along the inner wall of the right gland 2-1 is arranged on the inner wall of the right gland 2-1. The longitudinal section of the first groove 3 is of a "匚"-shaped structure. A first stepped groove 4 extending along the inner wall of the right gland 2-1 is arranged above the first groove 3. The longitudinal section of the first stepped groove 4 is of a two-step structure. A second groove 5 extending along the outer wall direction of the right half bearing 2-2 is arranged on the outer wall of the right half bearing 2-2. The longitudinal section of the second groove 5 is of a "匚"-shaped structure. A first arc-shaped baffle 6 extending upward along the groove wall of the second groove 5 is arranged at the lower port of the second groove 5. The right half stationary ring 2-4 and the right half rotating ring 2-5 are arranged in the accommodation cavity formed by the first arc-shaped baffle 6 and the second groove 5.

[0021] Preferably, in order to improve the sealing performance, the right half moving ring 2-5 is a 7-shaped structure, and the outer wall portion of the second transverse plate 10 on the right half moving ring 2-5 is against the inner wall of the first arc-shaped baffle 6, and the first arc-shaped baffle 6, the right half static ring 2-4 and the second groove 5 cooperate to form a first sealing cavity 7 for accommodating the third half sealing ring 2-7, the longitudinal section of the right half static ring 2-4 is an L-shaped structure, the first transverse plate 9 on the right half static ring 2-4 is provided with a second arc-shaped baffle 8 against the upper surface of the second transverse plate 10 on the right half moving ring 2-5, and the first stepped groove 4 includes a lower step 1 located below 1 and an upper step 12 located above, the lower step 11 includes a first vertical table surface 11-1 and a first horizontal table surface 11-2, the upper step 12 includes a second vertical table surface 12-1 and a second horizontal table surface 12-2, the outer wall portion of the first transverse plate 9 abuts against the inner wall of the first vertical table surface 11-1, the outer wall portion of the first longitudinal plate on the right half of the static ring 2-4 abuts against the inner wall of the second vertical table surface 12-1, and the upper end of the first longitudinal plate abuts against the second horizontal table surface 12-2, and a second sealing cavity 16 for accommodating the second half of the sealing ring 2-6 is also formed between the outer wall of the first longitudinal plate and the inner wall of the second vertical table surface 12-1.

[0022] Preferably, in order to improve the locking effect and further improve the sealing performance, the right gland 2-1 and the right half bearing 2-2 are fixed by a side radial bearing bolt 17.

[0023] Preferably, in order to improve the locking effect and further improve the sealing performance, a first mounting notch 13 is provided on the right side of the right pressure cover 2-1, and one or more radial pressure cover bolts 19 are provided on the first mounting notch 13. After the radial pressure cover bolts 19 pass through the first mounting notch 13, they are threadedly connected to the right side of the left pressure cover 1-1. A second mounting notch 14 is provided on the left side of the left pressure cover 1-1, and one or more radial pressure cover bolts 19 are provided on the second mounting notch 14. After the radial pressure cover bolts 19 pass through the second mounting notch 14, they are threadedly connected to the left side of the right pressure cover 2-1.

[0024] Preferably, in order to improve the locking effect and further improve the sealing performance, the right half bearing 2-2 and the left half bearing 1-2 are fixedly connected on both sides thereof by a radial locking ring bolt 15 at the top and bottom.

[0025] Preferably, in order to improve the overall strength, the right pressure cover 2-1 and the left pressure cover 1-1 include raw materials configured in the following proportions: 20-30 parts of 316 stainless steel, 5-10 parts of silicon carbide, and 1-4 parts of graphite. The above-mentioned half-side sealing rings are all made of fluororubber. The overall strength of the materials configured by the above-mentioned configuration is stronger and the stability is better.

[0026] Compared with the existing technical effects, the present structure has the characteristics of container-type splitting. Since the existing integrated type is transformed into two symmetrically matched split structures, and then can be restored to form a complete container-type seal after being tightened by the radial pressure cover bolts 19, the entire installation is simple and no special tools are required. At the same time, the entire seal can be pressure tested in the later stage to ensure the sealing reliability and startup stability, so that the present structure can directly complete the replacement of the mechanical seal without disassembling large components such as bearings, reducers, motors, etc., and can continuously ensure the rotary shaft seal sealing of the pump equipment, greatly reducing the time and cost of equipment disassembly and maintenance.

[0027] Compared with the existing integrated type: During the installation process of the existing integrated type, each component needs to be installed completely independently, the installation is relatively complicated, and the space requirements for the installation operation are relatively high (a relatively large installation space is required, and the installation process is time-consuming. The split structure of this structure only needs to splice our two left half sealing components 1 and the right half sealing components 2 separately, and then dock and install and lock them. The installation is quick and requires less construction space. The processing technology of each metal part is to first process it into a rough embryo, then split it, and then finely process it to form a split structure, and assemble it during the later installation.

[0028] During the processing: the dynamic ring part is designed as a 7-shaped structure, which is also similar to a V-shaped opening with the opening facing outward and tilted, so that the dynamic ring can be easily connected without misaligning the teeth during installation; at the same time, a trapezoidal connection structure is used between the dynamic ring and the static ring, so that the dynamic and static rings will not fall off.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A completely split cartridge mechanical seal structure, characterized in that: It includes a left half sealing component (1) and a right half sealing component (2) that cooperate with each other to form an annular seal. The left half sealing component (1) and the right half sealing component (2) are of C-shaped structure. The left half sealing component (1) and the right half sealing component (2) are threadedly connected by more than one radial gland bolt (19). The right half sealing component (2) includes a right gland (2-1) and a right half bearing (2-2) that cooperate with each other. A first half sealing ring (2-3) is arranged inside the right half bearing (2-2). A right half static ring (2-4) and a right half dynamic ring (2-5) that cooperate with each other are arranged between the right gland (2-1) and the right half bearing (2-2). The upper end of the right half static ring (2-4) abuts against the right gland (2-1), and the lower end of the right half static ring (2-4) abuts against the right half dynamic ring (2-5). A second half sealing ring (2-6) is arranged between the right half static ring (2-4) and the right gland (2-1). A third half sealing ring (2-7) is arranged between the right half dynamic ring (2-5) and the right half bearing (2-2). The left half sealing component (1) includes a left gland (1-1) and a left half bearing (1-2) that cooperate with each other. A fourth half sealing ring (1-3) is arranged inside the left half bearing (1-2). A left half static ring (1-4) and a left half dynamic ring (1-5) that cooperate with each other are arranged between the left gland (1-1) and the left half bearing (1-2). The upper end of the left half static ring (1-4) abuts against the left gland (1-1), and the lower end of the left half static ring (1-4) abuts against the left half dynamic ring (1-5). A fifth half sealing ring (1-6) is arranged between the left half static ring (1-4) and the left gland (1-1). A sixth half sealing ring (1-7) is arranged between the left half dynamic ring (1-5) and the left half bearing (1-2). The sixth half sealing ring (1-7) cooperates with the third half sealing ring (2-7), and the fifth half sealing ring (1-6) cooperates with the second half sealing ring (2-6). A half gasket (18) that cooperates with each other to form a complete gasket is also arranged on the lower surfaces of the right gland (2-1) and the left gland (1-1). The left half sealing component (1) and the right half sealing component (2) are mirror images. A first groove (3) extending along the inner wall of the right gland (2-1) is arranged on the inner wall of the right gland (2-1). The longitudinal section of the first groove (3) is of a "匚"-shaped structure. A first stepped groove (4) extending along the inner wall of the right gland (2-1) is arranged above the first groove (3). The longitudinal section of the first stepped groove (4) is of a two-step structure. A second groove (5) extending along the outer wall direction of the right half bearing (2-2) is arranged on the outer wall of the right half bearing (2-2). The longitudinal section of the second groove (5) is of a "匚"-shaped structure. A first arc-shaped baffle (6) extending upward along the groove wall of the second groove (5) is arranged at the lower port of the second groove (5).The right half static ring (2-4) and the right half dynamic ring (2-5) are arranged in a receiving cavity formed by a first arc-shaped baffle plate (6) and a second groove (5); the right half dynamic ring (2-5) is a 7-shaped structure; the outer wall portion of the second transverse plate (10) on the right half dynamic ring (2-5) abuts against the inner wall of the first arc-shaped baffle plate (6); and the first arc-shaped baffle plate (6), the right half static ring (2-4) and the second groove (5) cooperate to form a A first sealing cavity (7) for accommodating a third half sealing ring (2-7); the longitudinal cross section of the right half static ring (2-4) is an L-shaped structure; the first transverse plate (9) on the right half static ring (2-4) is provided with a second arc-shaped baffle (8) abutting against the upper surface of the second transverse plate (10) on the right half dynamic ring (2-5); the first stepped groove (4) comprises a lower step (11) located below and an upper step (12) located above; the lower step (11) comprises a first vertical table surface (11-1) and a first horizontal table surface (11-2); the upper step (12) comprises a second vertical table surface (12-1) and a second horizontal table surface (12-2); the outer wall portion of the first transverse plate (9) abuts against the inner wall of the first vertical table surface (11-1); the outer wall portion of the first longitudinal plate on the right half static ring (2-4) abuts against the inner wall of the second vertical table surface (12-1); and the upper end of the first longitudinal plate The first longitudinal plate is against the second horizontal table surface (12-2), and a second sealing cavity (16) for accommodating a second half sealing ring (2-6) is formed between the outer wall of the first longitudinal plate and the inner wall of the second vertical table surface (12-1). The right gland (2-1) and the left gland (1-1) include raw materials prepared in the following proportions: 20-30 parts of 316 stainless steel, 5-10 parts of silicon carbide, and 1-4 parts of graphite. The above-mentioned half sealing rings are all made of fluororubber.

2. A completely split cartridge mechanical seal structure according to claim 1, characterized in that: The right gland (2-1) and the right half bearing (2-2) are fixed via radial bearing bolts (17) on the side.

3. A completely split cartridge mechanical seal structure according to claim 2, characterized in that: A first mounting notch (13) is provided on the right side of the right gland (2-1), and one or more radial gland bolts (19) are provided on the first mounting notch (13). The radial gland bolts (19) pass through the first mounting notch (13) and are threadedly connected to the right side of the left gland (1-1). A second mounting notch (14) is provided on the left side of the left gland (1-1), and one or more radial gland bolts (19) are provided on the second mounting notch (14). The radial gland bolts (19) pass through the second mounting notch (14) and are threadedly connected to the left side of the right gland (2-1).

4. A completely split cartridge mechanical seal structure according to claim 3, characterized in that: The right half bearing (2-2) and the left half bearing (1-2) are fixedly connected at both upper and lower sides via a radial locking ring bolt (15).

Images