Mechanical seal device of mechanical pulp thick pump

Abstract

A mechanical sealing device of a mechanical pulp concentrated pump relates to the technical field of sealing devices and comprises a pump shell, a shaft head is rotatably arranged on the pump shell, a first sealing sleeve sleeved on the shaft head is fixedly arranged on the pump shell, one end of the first sealing sleeve is connected with a second sealing sleeve, and a spacer ring is arranged between opposite ends of the first sealing sleeve and the second sealing sleeve. A first sealing rubber seat is sleeved with the first sealing sleeve, the outer ring of the first sealing rubber seat abuts against the inner wall of the first sealing sleeve, the inner ring of the first sealing rubber seat abuts against the surface of the shaft head in a friction mode, a second sealing rubber seat is sleeved with the second sealing sleeve, and the outer ring of the second sealing rubber seat abuts against the inner wall of the second sealing sleeve. The inner ring of the second sealing rubber seat frictionally abuts against the surface of the shaft head. The mechanical pulp concentrated pump solves the problems that in the using process of a mechanical pulp concentrated pump in the prior art, due to the frequent leakage phenomenon of a concentrated pump mechanical seal, material leakage is serious, waste is caused, a pump shaft is inevitably abraded due to damage of the mechanical seal, the pump shaft needs to be disassembled, assembled and replaced, and maintenance difficulty is large.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a sealing device for a mechanical slurry concentrate pump. Background Art

[0002] Mechanical pulp is a general term for pulp produced by mechanically grinding fiber raw materials. Due to differences in raw materials and refining methods, there are many varieties. Pulps made from wood are called mechanical wood pulp or groundwood, while those made from grass are called mechanical straw pulp. Mechanical wood pulp is further divided into white groundwood and brown groundwood. The production process of mechanical pulp requires the use of a thickener to transport the material.

[0003] The patent with announcement number CN214577899U, this scheme includes a heat-insulating throttling ring arranged in one end of the mechanical seal device facing the impeller side of the pump, a dynamic ring assembly and a static ring assembly arranged between the mechanical seal sleeve and the pressure cover of the mechanical seal device; the dynamic ring assembly is spaced apart from the heat-insulating throttling ring, and the static ring assembly is located on the side of the dynamic ring assembly facing away from the heat-insulating throttling ring and abuts against the dynamic ring assembly in the axial direction. The pump mechanical seal structure, through the setting of the heat-insulating throttling ring, improves the sealing isolation between the impeller side and the bearing box side of the pump, blocks the heat conduction of the high-temperature medium in the pump cavity to the mechanical seal cavity, reduces the leakage and temperature of the mechanical seal, and solves the frequent problems of excessive moisture in the lubricating oil and rust on the motor shaft and bearing shell in the pump group.

[0004] As the existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] During the use of existing mechanical slurry thickening pumps, the thickening pump seals frequently leak, which leads to serious material leakage and waste. Damage to the seals will inevitably wear out the pump shaft, which requires disassembly and replacement of the pump shaft, making maintenance difficult.

[0006] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0007] In response to the defects in the existing technology, the utility model solves the problem that the mechanical slurry thickening pump in the traditional technology often leaks during use, which leads to serious material leakage and waste. Damage to the mechanical seal will inevitably wear out the pump shaft, and the pump shaft needs to be disassembled and replaced, making maintenance difficult.

[0008] In order to solve the above problems, the present invention provides the following technical solutions:

[0009] The mechanical slurry pump sealing device includes a pump housing, a shaft head is rotatably provided on the pump housing, a first sealing sleeve is fixedly provided on the pump housing and is sleeved on the shaft head, one end of the first sealing sleeve is connected to the second sealing sleeve, and a spacer ring is provided between the opposite ends of the first sealing sleeve and the second sealing sleeve.

[0010] A first sealing rubber seat is mounted inside the first sealing sleeve, the outer ring of the first sealing rubber seat abuts against the inner wall of the first sealing sleeve, and the inner ring of the first sealing rubber seat frictionally abuts against the surface of the shaft head.

[0011] The second sealing sleeve is provided with a second sealing rubber seat, the outer ring of the second sealing rubber seat abuts against the inner wall of the second sealing sleeve, and the inner ring of the second sealing rubber seat frictionally abuts against the surface of the shaft head.

[0012] The ends of the first sealing rubber seat and the second sealing rubber seat that are away from each other are respectively connected with elastic pressure components, and the opposite end surfaces of the first sealing rubber seat and the second sealing rubber seat respectively abut against the opposite end surfaces of the spacer ring.

[0013] As an optimized solution, a connecting disc section is provided at one end of the first sealing sleeve, and the connecting disc section is fixed to the outer wall of the pump casing by means of bolts.

[0014] As an optimized solution, two first sealing rings are provided in sequence from outside to inside between the inner wall of the connecting disc segment and the outer wall of the pump casing.

[0015] As an optimized solution, a first sealing ring is provided between the inner ring of the connecting disc segment and the shaft head.

[0016] As an optimized solution, a sealing ring groove is formed on the inner ring of the connecting disc segment, the first sealing ring is clamped in the sealing ring groove, and the inner ring of the first sealing ring is frictionally opposed to the shaft head.

[0017] As an optimized solution, the inner ring of the second sealing sleeve close to the outer end is provided with a reduced diameter section, and a second sealing ring is provided between the inner ring of the reduced diameter section and the shaft head.

[0018] As an optimized solution, a sealing ring groove is formed on the inner ring of the reduced diameter section, the second sealing ring is clamped in the sealing ring groove, and the inner ring of the second sealing ring is frictionally opposed to the shaft head.

[0019] As an optimized solution, the elastic pressure assembly includes a first limiting ring and a first pressure ring which are mounted in the first sealing sleeve, one end of the first limiting ring is against the connecting disc section, one end of the first pressure ring is against the first sealing rubber seat, and a first compression spring is provided between the first limiting ring and the first pressure ring.

[0020] As an optimized solution, annular clamping grooves are provided on the opposite end surfaces of the first limiting ring and the first pressure ring, and the two ends of the first compression spring are correspondingly clamped in the annular clamping grooves.

[0021] As an optimized solution, the elastic pressure assembly includes a second limiting ring and a second pressure ring which are sleeved in the second sealing sleeve, one end of the second limiting ring is against the reduced diameter section, one end of the second pressure ring is against the second sealing rubber seat, and a second compression spring is provided between the second limiting ring and the second pressure ring.

[0022] As an optimized solution, annular clamping grooves are provided on the opposite end faces of the second limiting ring and the second pressure ring, and both ends of the second compression spring are correspondingly clamped in the annular clamping grooves.

[0023] As an optimized solution, the end faces of the first limiting ring and the first pressure ring in contact, and the end faces of the second limiting ring and the second pressure ring in contact are provided with matching conical pressure inclined surfaces.

[0024] As an optimized solution, the opposite ends of the first sealing sleeve and the second sealing sleeve are respectively provided with connecting flanges, the two connecting flanges are connected by a bolt assembly, and two second sealing rings are sequentially provided between the two connecting flanges from the outside to the inside.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] Double sealing is achieved by providing a first sealing sleeve and a second sealing sleeve, and correspondingly providing a first sealing rubber seat and a second sealing rubber seat inside. The corresponding pressure ring uses a compression spring to squeeze the sealing rubber seat, so that its inner ring and outer ring always abut against the sealing sleeve and the shaft head, thereby improving the sealing performance. The purpose of providing the spring is to achieve self-compensation under the action of the spring and the conical pressure inclined surface when the sealing rubber seat is worn during use, so as to squeeze and deform the sealing rubber seat and improve the sealing performance.

[0027] Through the detachable connection between the first sealing sleeve and the second sealing sleeve, when maintenance is required, only the first sealing rubber seat and the second sealing rubber seat need to be replaced, which greatly reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0029] Figure 1 It is a structural diagram of the present utility model.

[0030] In the figure: 1-pump housing; 2-first sealing sleeve; 3-second sealing sleeve; 4-first sealing rubber seat; 5-first pressure ring; 6-first compression spring; 7-first limiting ring; 8-connecting plate section; 9-bolt; 10-first sealing ring; 11-first sealing ring; 12-first sealing ring; 13-second sealing rubber seat; 14-second pressure ring; 15-spacer ring; 16-flange; 17-bolt assembly; 18-second sealing ring; 19-second compression spring; 20-second limiting ring; 21-reduced diameter section; 22-shaft head. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0032] like Figure 1 As shown, the mechanical seal device of the mechanical slurry pump includes a pump housing 1, a shaft head 22 is rotatably provided on the pump housing 1, a first sealing sleeve 2 is fixedly provided on the pump housing 1 and is sleeved on the shaft head 22, one end of the first sealing sleeve 2 is connected to the second sealing sleeve 3, and a spacer ring 15 is provided between the opposite ends of the first sealing sleeve 2 and the second sealing sleeve 3.

[0033] The first sealing sleeve 2 is provided with a first sealing rubber seat 4, the outer ring of the first sealing rubber seat 4 abuts against the inner wall of the first sealing sleeve 2, and the inner ring of the first sealing rubber seat abuts against the surface of the shaft head 22.

[0034] The second sealing sleeve 3 is sheathed with a second sealing rubber seat 13. The outer ring of the second sealing rubber seat 13 abuts against the inner wall of the second sealing sleeve 3. The inner ring of the second sealing rubber seat abuts against the surface of the shaft head 22.

[0035] The ends of the first sealing rubber seat 4 and the second sealing rubber seat 13 away from each other are respectively connected to elastic pressure components, and the opposite end surfaces of the first sealing rubber seat 4 and the second sealing rubber seat 13 respectively abut against the opposite end surfaces of the spacer ring 15.

[0036] A connecting disc section 8 is provided at one end of the first sealing sleeve 2 , and the connecting disc section 8 is fixed to the outer wall of the pump casing 1 by means of bolts 9 .

[0037] Two first sealing rings 10 are provided in sequence from outside to inside between the inner wall of the connecting plate section 8 and the outer wall of the pump casing.

[0038] A first sealing ring is provided between the inner ring of the connecting disc segment 8 and the shaft head 22 .

[0039] A sealing ring groove is formed on the inner ring of the connecting disc segment 8 , and the first sealing ring is clamped in the sealing ring groove. The inner ring of the first sealing ring is in friction with the shaft head 22 .

[0040] The inner ring of the second sealing sleeve 3 close to the outer end is provided with a reduced diameter section 21 , and a second sealing ring is provided between the inner ring of the reduced diameter section 21 and the shaft head 22 .

[0041] The inner ring of the reduced diameter section 21 is provided with a sealing ring groove, the second sealing ring is clamped in the sealing ring groove, and the inner ring of the second sealing ring is frictionally abutted against the shaft head 22 .

[0042] The elastic pressure assembly includes a first limiting ring 7 and a first pressure ring 5 which are sleeved in the first sealing sleeve 2. One end of the first limiting ring 7 is against the connecting disc section 8, and one end of the first pressure ring 5 is against the first sealing rubber seat 4. A first compression spring 6 is provided between the first limiting ring 7 and the first pressure ring 5.

[0043] Annular clamping grooves are formed on the opposite end surfaces of the first limiting ring 7 and the first pressure ring 5 , and both ends of the first compression spring 6 are correspondingly clamped in the annular clamping grooves.

[0044] The elastic pressure assembly includes a second limiting ring 20 and a second pressure ring 14 which are sleeved in the second sealing sleeve 3. One end of the second limiting ring 20 is against the reduced diameter section 21, and one end of the second pressure ring 14 is against the second sealing rubber seat 13. A second compression spring 19 is provided between the second limiting ring 20 and the second pressure ring 14.

[0045] Annular mounting grooves are formed on the opposite end surfaces of the second limiting ring 20 and the second pressure ring 14 , and both ends of the second compression spring 19 are correspondingly mounted in the annular mounting grooves.

[0046] The end surfaces of the first limiting ring 7 in contact with the first pressure ring 5 , and the end surfaces of the second limiting ring 20 in contact with the second pressure ring 14 are provided with matching conical pressure inclined surfaces.

[0047] The opposite ends of the first sealing sleeve 2 and the second sealing sleeve 3 are respectively provided with connecting flanges 16, and the two connecting flanges 16 are connected by a bolt assembly 17. Two second sealing rings 18 are sequentially provided between the two connecting flanges 16 from the outside to the inside.

[0048] The working principle of this device is:

[0049] Double sealing is achieved by providing a first sealing sleeve 2 and a second sealing sleeve 3, and correspondingly providing a first sealing rubber seat 4 and a second sealing rubber seat 13 inside. The corresponding pressure ring uses a compression spring to squeeze the sealing rubber seat, so that its inner ring and outer ring always abut against the sealing sleeve and the shaft head 22, thereby improving the sealing performance. The purpose of providing the spring is to achieve self-compensation under the action of the spring and the conical pressure inclined surface when the sealing rubber seat is worn during use, so as to squeeze and deform the sealing rubber seat and improve the sealing performance.

[0050] Through the detachable connection between the first sealing sleeve 2 and the second sealing sleeve 3, when maintenance is required, only the first sealing rubber seat 4 and the second sealing rubber seat 13 need to be replaced, which greatly reduces the maintenance cost.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. Mechanical slurry concentration pump sealing device, characterized by: The pump housing (1) comprises a pump housing (1), a shaft head (22) being rotatably provided on the pump housing (1), a first sealing sleeve (2) being fixedly provided on the pump housing (1) and being sleeved on the shaft head (22), one end of the first sealing sleeve (2) being connected to a second sealing sleeve (3), a spacer ring (15) being provided between opposite ends of the first sealing sleeve (2) and the second sealing sleeve (3), A first sealing rubber seat (4) is sleeved inside the first sealing sleeve (2), the outer ring of the first sealing rubber seat (4) abuts against the inner wall of the first sealing sleeve (2), and the inner ring of the first sealing rubber seat abuts against the surface of the shaft head (22) by friction. A second sealing rubber seat (13) is sleeved inside the second sealing sleeve (3); the outer ring of the second sealing rubber seat (13) abuts against the inner wall of the second sealing sleeve (3); and the inner ring of the second sealing rubber seat abuts against the surface of the shaft head (22) by friction. The ends of the first sealing rubber seat (4) and the second sealing rubber seat (13) that are away from each other are respectively connected to elastic pressure components, and the opposite end surfaces of the first sealing rubber seat (4) and the second sealing rubber seat (13) respectively abut against the opposite end surfaces of the spacer ring (15).

2. The mechanical seal device of the mechanical slurry concentration pump according to claim 1 is characterized in that: A connecting plate section (8) is provided at one end of the first sealing sleeve (2), and the connecting plate section (8) is fixed to the outer wall of the pump casing (1) by means of bolts (9), and two first sealing rings (10) are provided in sequence from the outside to the inside between the inner wall of the connecting plate section (8) and the outer wall of the pump casing.

3. The mechanical seal device of the mechanical slurry concentration pump according to claim 2 is characterized in that: A first sealing ring is provided between the inner ring of the connecting disc section (8) and the shaft head (22), the inner ring of the connecting disc section (8) is provided with a sealing ring groove, the first sealing ring is clamped in the sealing ring groove, and the inner ring of the first sealing ring is frictionally abutted against the shaft head (22).

4. The mechanical seal device for a mechanical slurry concentration pump according to claim 3 is characterized in that: The inner ring of the second sealing sleeve (3) close to the outer end is provided with a reduced diameter section (21), a second sealing ring is provided between the inner ring of the reduced diameter section (21) and the shaft head (22), a sealing ring groove is provided on the inner ring of the reduced diameter section (21), the second sealing ring is clamped in the sealing ring groove, and the inner ring of the second sealing ring is frictionally abutted against the shaft head (22).

5. The mechanical seal device for a mechanical slurry concentration pump according to claim 4 is characterized in that: The elastic pressurizing component comprises a first limiting ring (7) and a first pressurizing ring (5) which are sleeved in the first sealing sleeve (2); one end of the first limiting ring (7) abuts against the connecting disc section (8); one end of the first pressurizing ring (5) abuts against the first sealing rubber seat (4); and a first compression spring (6) is provided between the first limiting ring (7) and the first pressurizing ring (5).

6. The mechanical seal device for a mechanical slurry concentration pump according to claim 5 is characterized in that: An annular clamping groove is provided on the opposite end faces of the first limiting ring (7) and the first pressure ring (5), and the two ends of the first compression spring (6) are correspondingly clamped in the annular clamping groove.

7. The mechanical seal device for a mechanical slurry concentration pump according to claim 6 is characterized in that: The elastic pressure component comprises a second limiting ring (20) and a second pressure ring (14) which are sleeved in the second sealing sleeve (3); one end of the second limiting ring (20) abuts against the reduced diameter section (21); one end of the second pressure ring (14) abuts against the second sealing rubber seat (13); and a second compression spring (19) is provided between the second limiting ring (20) and the second pressure ring (14).

8. The mechanical seal device for a mechanical slurry concentration pump according to claim 7 is characterized in that: An annular clamping groove is formed on the opposite end faces of the second limiting ring (20) and the second pressure ring (14), and the two ends of the second compression spring (19) are correspondingly clamped in the annular clamping groove.

9. The mechanical seal device for a mechanical slurry concentration pump according to claim 8, characterized in that: The end surfaces of the first limiting ring (7) in contact with the first pressure ring (5), and the end surfaces of the second limiting ring (20) in contact with the second pressure ring (14) are provided with matching conical pressure inclined surfaces.

10. The mechanical seal device of the mechanical slurry concentration pump according to claim 9, characterized in that: The first sealing sleeve (2) and the second sealing sleeve (3) are respectively provided with connecting flanges (16) at opposite ends thereof; the two connecting flanges (16) are connected to each other via a bolt assembly (17); and two second sealing rings (18) are sequentially provided between the two connecting flanges (16) from the outside to the inside.

Images