Single-end-face mechanical sealing device with aggregate well

Abstract

The single-end-face mechanical sealing device comprises a flange plate, a shaft hole for a transmission shaft to penetrate through is formed in the center of the flange plate, and an outwards-extending material collecting barrel is arranged on the front face of the flange plate. The main static ring is fixed to the front face of the flange plate through a gland, and the driving ring abuts against the end face of the main static ring and rotates relative to the main static ring. The transmission shaft penetrates out of the material collecting barrel, the outer wall of the penetrating-out end of the transmission shaft is sequentially sleeved with a locking ring, an axial floating sealing ring and a polytetrafluoroethylene corrugated pipe in the direction towards the front face of the flange plate, the locking ring is fixed to the outer wall of the transmission shaft, and a sealing ring matched with the outer wall of the transmission shaft in a sealing mode is arranged on the inner wall of the axial floating sealing ring. The two ends of the polytetrafluoroethylene corrugated pipe abut against or are connected with or welded to the end face of the axial floating sealing ring and the end face of the driving ring in a sealed mode. The utility model has the advantages that the sealing reliability is high, scraps between the sliding pairs can be effectively prevented from being mixed into the reaction kettle, the adjusting range of the sealing pre-pressure and the stroke compensation range is large, and the adjustment is convenient.

Description

Technical Field

[0001] The utility model relates to the field of transmission shaft sealing, in particular to a single-end surface mechanical sealing device with a collection well. Background Art

[0002] The seal of the transmission shaft is used in various mixing and gas-liquid medium transportation occasions. For some occasions with corrosive media, there are higher requirements for the sealing of the transmission shaft.

[0003] Chinese patent CN202321707377.1 discloses a novel polytetrafluoroethylene bellows double-end mechanical seal, including a pump shaft, on which a sealing structure is installed; the sealing structure includes: a main static ring, an active ring, a polytetrafluoroethylene bellows, a snap ring, a spring seat, a spring ring, a first push ring, a drive ring, a cylindrical pin, a secondary dynamic ring, a secondary static ring, an anti-rotation pin, a baffle, a dynamic ring O-ring, a second push ring, a wave spring, a gland and a housing; the utility model relates to the technical field of mechanical seals, and the external clean sealing liquid enters the integral mechanical seal from the sealing liquid inlet and flows out from the sealing liquid outlet, circulating back and forth, cooling and lubricating the main static ring and the active ring joint surface and the secondary dynamic ring and the secondary static ring joint surface, thereby achieving the purpose of improving the mechanical seal performance, extending the service life of the mechanical seal, being easy to use, having a compact structure, being suitable for use in mechanical seals with a small installation space, and realizing a double-end mechanical seal;

[0004] When it is working, the relative friction between the main static ring and the active ring will produce small debris, which is easy to fall off and mix into the reactor to pollute the medium in the reactor; at the same time, the preload and stroke compensation adjustment between the main static ring and the active ring is extremely inconvenient. Utility Model Content

[0005] Based on the above problems, the purpose of the utility model is to provide a single-end mechanical seal device with a feed well, which has high sealing reliability, can effectively prevent debris between sliding pairs from mixing into the reactor, has a large adjustment range of sealing prepressure and stroke compensation range, and is easy to adjust.

[0006] In view of the above problems, the following technical solutions are provided: a single-end mechanical seal device with a collection well, comprising a flange, a shaft hole for a transmission shaft to pass through is provided in the center of the flange, an outwardly extending collection barrel is provided on the front of the flange, and the outer sleeve of the collection barrel is provided with a main static ring fixed to the front of the flange through a pressure cover and an active ring that abuts against the end face of the main static ring and rotates relative to each other; the transmission shaft passes through the collection barrel and the outer wall of the passing end is sequentially covered with a locking ring, an axial floating sealing ring, and a polytetrafluoroethylene bellows toward the front of the flange, the locking ring is fixed to the outer wall of the transmission shaft, and the The inner wall of the axial floating sealing ring is provided with a sealing ring that seals with the outer wall of the transmission shaft, and the two ends of the polytetrafluoroethylene bellows are respectively abutted or glued or welded with the end face of the axial floating sealing ring and the end face of the active ring for sealing; the locking ring is provided with a tightening screw for abutting against the axial floating sealing ring to make it approach the front direction of the flange, and the outer edge of the end of the polytetrafluoroethylene bellows facing the active ring is provided with a tightening shoulder, and the end of the polytetrafluoroethylene bellows facing the active ring is provided with a floating push ring that abuts against the tightening shoulder, and a tightening spring is provided between the axial floating sealing ring and the floating push ring.

[0007] In the above structure, the collecting barrel is integrally connected with the flange, extending upward and reaching the lower end of the polytetrafluoroethylene bellows, so that the friction surface position of the main static ring and the active ring is lower than the upper end of the collecting barrel, so that the debris generated when the two rotate can be blocked by the collecting barrel to avoid falling into the reactor; the polytetrafluoroethylene bellows can use its creep compensation performance to perform axial compensation for the active ring, and can also perform eccentric compensation for some glass-lined reactors and reactors with poor equipment accuracy; when adjusting, the axial floating sealing ring is pushed toward the main static ring by screwing the tightening screw, and the axial floating sealing ring pushes the active ring by compressing the tightening spring, so that the active ring is in close contact with the end face of the main static ring to achieve sealing. When the active ring and the main static ring are worn, the tightening spring can compensate for the axial position of the active ring, thereby ensuring the sealing performance. It has a large compensation stroke and pre-pressure adjustment range, and has the advantages of easy adjustment.

[0008] The utility model is further configured that the inner ring walls of the main static ring and the active ring are clearance-matched with the outer wall of the collecting barrel; and the inner diameter of the polytetrafluoroethylene bellows is larger than the outer diameter of the collecting barrel.

[0009] In the above structure, it is ensured that there is enough space to accommodate the wear debris generated when the main static ring and the active ring move relative to each other.

[0010] The utility model is further configured that the locking ring is composed of two arc-shaped rings that are opposite to each other, and the two arc-shaped rings are locked together and clamped on the outer wall of the transmission shaft by screws.

[0011] In the above structure, the split locking ring has the advantages of easy disassembly and assembly and strong radial locking force.

[0012] The utility model is further configured that a protective sleeve is provided between the inner wall of the locking ring and the outer wall of the transmission shaft.

[0013] In the above structure, the protective sleeve is made of insulating material, preferably rubber or polytetrafluoroethylene, which can effectively avoid direct contact between the locking ring and the outer wall of the transmission shaft and increase friction while providing insulation performance.

[0014] The utility model is further configured that a plurality of the clamping screws are evenly distributed along the circumferential direction of the locking ring.

[0015] In the above structure, the consistency of the thrust acting on each position of the axial floating seal ring in the circumferential direction can be ensured, thereby preventing the axial floating seal ring from being skewed.

[0016] The utility model is further configured that the outer wall of the axial floating sealing ring is provided with a positioning groove; the axial floating sealing ring also includes a transition ring clamped on the positioning groove, the transition ring is composed of two arc rings that are opposite to each other, and the two arc rings are locked together in the positioning groove by screws.

[0017] In the above structure, the axial floating sealing ring is preferably made of polytetrafluoroethylene, and is wrapped around the transmission shaft by the tightening force of the transition ring. The friction force generated when the axial tightening of the transmission shaft is axially tightened is smaller than the friction force generated when the locking ring axially tightens the transmission shaft, thereby ensuring that the axial floating sealing ring can be pushed for axial displacement when the tightening screw is adjusted. The split transition ring has the advantages of easy disassembly and assembly and strong radial locking force.

[0018] The utility model is further configured that a plurality of positioning holes are evenly distributed along the circumferential direction of the floating push ring at one end facing the transition ring, and the clamping spring is located in the positioning hole and abuts against the end face of the transition ring.

[0019] In the above structure, the positioning hole is used to provide positioning for the clamping spring, and the number of the clamping springs can be increased or decreased according to requirements to provide more delicate pressure adjustment for the main static ring and the active ring.

[0020] The utility model is further configured that a fixed shoulder is provided on the outer wall of one end of the main static ring facing the flange, and the gland is pressed on the fixed shoulder.

[0021] In the above structure, the gland is fixed to the flange by gland screws.

[0022] The utility model is further configured that sealing gaskets are provided between the fixed shoulder and the pressure cover, and between the main static ring and the front face of the flange.

[0023] In the above structure, the sealing gasket is preferably a rubber gasket or a polytetrafluoroethylene gasket to provide sealing performance.

[0024] The utility model is further configured such that the front face of the flange is provided with an inwardly concave end face groove, the main static ring is placed in the end face groove, the bottom of the end face groove is provided with a plurality of concentrically offset anti-creep grooves, and the sealing gasket between the main static ring and the front face of the flange is in contact with the bottom of the end face groove.

[0025] In the above structure, the end face groove is used to provide a centering effect for the main static ring; the anti-creep groove can reduce the creep effect of the sealing gasket when the main static ring is pressed by the gland.

[0026] The utility model is further configured that the front side of the flange plate is also provided with an isolation cylinder which is coaxially arranged with the collecting cylinder and extends outward, and the collecting cylinder, the pressure cover, the main static ring and the active ring are all located in the isolation cylinder; the flange plate on the outer side of the isolation cylinder is provided with a flange hole.

[0027] In the above structure, during operation, sealing liquid is injected into the isolation cylinder to achieve lubrication and cooling.

[0028] The beneficial effects of the utility model are as follows: the collecting barrel is integrally connected with the flange, extending upward to reach the lower end of the polytetrafluoroethylene bellows, so that the friction surface position of the main static ring and the active ring is lower than the upper end of the collecting barrel, so that the debris generated when the two rotate can be blocked by the collecting barrel to avoid falling into the reactor; the polytetrafluoroethylene bellows can utilize its creep compensation performance to perform axial compensation on the active ring, and at the same time, it can perform eccentric compensation on some glass-lined reactors and reactors with poor equipment accuracy; when adjusting, the axial floating sealing ring is pushed toward the main static ring by screwing the tightening screw, and the axial floating sealing ring pushes the active ring by compressing the tightening spring, so that the active ring is in close contact with the end face of the main static ring to achieve sealing, and when the active ring and the main static ring are worn, the tightening spring can compensate for the axial position of the active ring, thereby ensuring the sealing, and its compensation stroke and pre-pressure adjustment range are large, and it has the advantages of convenient adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0030] Figure 2 It is a schematic diagram of the full cutaway three-dimensional structure of the utility model.

[0031] Figure 3 It is a schematic diagram of the first exploded three-dimensional structure of the utility model.

[0032] Figure 4 It is a schematic diagram of the second exploded three-dimensional structure of the utility model.

[0033] Figure 5 For this utility model Figure 3 Schematic diagram of the full cross-section structure of the left part.

[0034] Figure 6 For this utility model Figure 3 Schematic diagram of the full cross-section structure of the right part.

[0035] The meaning of the numbers in the figure are as follows: 10-flange; 101-end face groove; 102-anti-creep groove; 103-isolation cylinder; 104-flange hole; 11-shaft hole; 12-collecting cylinder; 13-pressure cover; 131-pressure cover screw; 132-sealing gasket; 14-main static ring; 141-fixed shoulder; 15-active ring; 16-locking ring; 161-tension screw; 162-arc ring; 163-screw; 164-protective sleeve; 17-axial floating sealing ring; 171-sealing ring; 172-positioning groove; 18-PTFE bellows; 181-tension shoulder; 19-floating push ring; 191-positioning hole; 20-tension spring; 21-transition ring; 211-arc ring; 212-screw; a-drive shaft. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] refer to Figures 1 to 6 ,like Figures 1 to 6 The single-end mechanical seal device with a collection well shown in the figure comprises a flange 10, wherein the center of the flange 10 is provided with an axial hole 11 for a transmission shaft a to pass through, and the front of the flange 10 is provided with an outwardly extending collection barrel 12, and the collection barrel 12 is covered with a main static ring 14 fixed to the front of the flange 10 through a pressure cover 13, and an active ring 15 which abuts against the end face of the main static ring 14 and rotates relative to each other; the transmission shaft a passes through the collection barrel 12, and the outer wall of the passing end is covered with a locking ring 16, an axial floating sealing ring 17, and a polytetrafluoroethylene bellows 18 in sequence toward the front of the flange 10, wherein the locking ring 16 is fixed to the outer wall of the transmission shaft a, and the inner wall of the axial floating sealing ring 17 is provided with a locking ring 16, an axial floating sealing ring 17, and a polytetrafluoroethylene bellows 18. The wall is provided with a sealing ring 171 that seals with the outer wall of the transmission shaft a, and the two ends of the polytetrafluoroethylene bellows 18 are respectively abutted or glued or welded with the end faces of the axial floating sealing ring 17 and the active ring 15 for sealing; the locking ring 16 is provided with a tightening screw 161 used to abut against the axial floating sealing ring 17 to make it move closer to the front direction of the flange 10, and the outer edge of the end of the polytetrafluoroethylene bellows 18 facing the active ring 15 is provided with a tightening shoulder 181, and the end of the polytetrafluoroethylene bellows 18 facing the active ring 15 is provided with a floating push ring 19 that abuts against the tightening shoulder 181, and a tightening spring 20 is provided between the axial floating sealing ring 17 and the floating push ring 19.

[0038] In the above structure, the collecting barrel 12 is integrally connected with the flange 10, extending upward to reach the lower end of the polytetrafluoroethylene bellows 18, so that the friction surface of the main static ring 14 and the active ring 15 is lower than the upper end of the collecting barrel 12. Therefore, the debris generated when the two rotate can be blocked by the collecting barrel 12 to avoid falling into the reactor; the polytetrafluoroethylene bellows 18 can use its creep compensation performance to perform axial compensation on the active ring 15, and can also compensate for the deviation of some glass-lined reactors and reactors with poor equipment accuracy. Center compensation; during adjustment, the axial floating sealing ring 17 is pushed toward the main static ring 14 by screwing the tightening screw 161, and the axial floating sealing ring 17 pushes the active ring 15 by compressing the tightening spring 20, so that the active ring 15 is in close contact with the end face of the main static ring 14 to achieve sealing. When the active ring 15 and the main static ring 14 are worn, the tightening spring 20 can compensate for the axial position of the active ring 15, thereby ensuring the sealing. The compensation stroke and pre-pressure adjustment range are large, and it has the advantage of easy adjustment.

[0039] In this embodiment, the inner ring walls of the main static ring 14 and the active ring 15 are clearance-matched with the outer wall of the collecting barrel 12 ; the inner diameter of the polytetrafluoroethylene bellows 18 is larger than the outer diameter of the collecting barrel 12 .

[0040] In the above structure, it is ensured that there is enough space to accommodate the wear debris generated when the main static ring 14 and the active ring 15 move relative to each other.

[0041] In this embodiment, the locking ring 16 is composed of two arc-shaped rings 161 that are opposite to each other. The two arc-shaped rings 161 are locked together and clamped to the outer wall of the transmission shaft a by screws 163.

[0042] In the above structure, the split locking ring 16 has the advantages of easy assembly and disassembly and strong radial locking force.

[0043] In this embodiment, a protective sleeve 164 is provided between the inner wall of the locking ring 16 and the outer wall of the transmission shaft a.

[0044] In the above structure, the protective sleeve 164 is made of insulating material, preferably rubber or polytetrafluoroethylene, which can effectively avoid direct contact between the locking ring 16 and the outer wall of the transmission shaft a and increase friction while providing insulation performance.

[0045] In this embodiment, a plurality of the clamping screws 161 are evenly distributed along the circumferential direction of the locking ring 16 .

[0046] In the above structure, the consistency of the thrust acting on each position of the axial floating seal ring 17 in the circumferential direction can be ensured, thereby preventing the axial floating seal ring 17 from being skewed.

[0047] In this embodiment, a positioning groove 172 is provided on the outer wall of the axial floating sealing ring 17; the axial floating sealing ring 17 also includes a transition ring 21 clamped on the positioning groove 172, and the transition ring 21 is composed of two arc rings 211 that are opposite to each other, and the two arc rings 211 are locked together in the positioning groove 172 by screws 212.

[0048] In the above structure, the axial floating sealing ring 17 is preferably made of polytetrafluoroethylene, and is wrapped around the transmission shaft a by the tightening force of the transition ring 21. The friction force generated when the axial tightening of the transmission shaft a is axially tightened is smaller than the friction force generated when the locking ring 16 axially tightens the transmission shaft a, thereby ensuring that the axial floating sealing ring 17 can be pushed for axial displacement when the tightening screw 161 is adjusted. The split transition ring 21 has the advantages of easy disassembly and assembly and strong radial locking force.

[0049] In this embodiment, a plurality of positioning holes 191 evenly distributed along the circumferential direction of the floating push ring 19 facing the transition ring 21 are provided, and the clamping spring 20 is located in the positioning hole 191 and abuts against the end surface of the transition ring 21 .

[0050] In the above structure, the positioning hole 191 is used to provide positioning for the clamping spring 20 , and the number of the clamping springs 20 can be increased or decreased according to requirements to provide more delicate pressure adjustment for the main static ring 14 and the active ring 15 .

[0051] In this embodiment, a fixed shoulder 141 is provided on the outer wall of one end of the main static ring 14 facing the flange 10 , and the gland 13 is pressed on the fixed shoulder 141 .

[0052] In the above structure, the gland 13 is fixed to the flange 10 by gland screws 131 .

[0053] In this embodiment, sealing gaskets 132 are provided between the fixed shoulder 141 and the gland 13 , and between the main static ring 14 and the front face of the flange 10 .

[0054] In the above structure, the sealing gasket 132 is preferably a rubber gasket or a polytetrafluoroethylene gasket to provide sealing performance.

[0055] In this embodiment, the front side of the flange 10 is provided with an inwardly concave end face groove 101, the main static ring 14 is placed in the end face groove 101, the bottom of the end face groove 101 is provided with a plurality of concentrically offset anti-creep grooves 102, and the sealing gasket 132 between the main static ring 14 and the front side of the flange 10 is in contact with the bottom of the end face groove 101.

[0056] In the above structure, the end surface groove 101 is used to provide a centering effect for the main static ring 14 ; the anti-creep groove 102 can reduce the creep effect of the sealing gasket 132 when the main static ring 14 is pressed by the gland 13 .

[0057] In this embodiment, the front side of the flange 10 is also provided with an isolation cylinder 103 which is coaxially arranged with the collecting cylinder 12 and extends outward. The collecting cylinder 12, the pressure cover 13, the main static ring 14, and the active ring 15 are all located in the isolation cylinder 103; the flange 10 outside the isolation cylinder 103 is provided with a flange hole 104.

[0058] In the above structure, during operation, sealing liquid is injected into the isolation cylinder 103 to achieve lubrication and cooling.

[0059] The beneficial effects of the utility model are as follows: the collecting barrel 12 is integrally connected with the flange 10, extending upward to reach the lower end of the polytetrafluoroethylene bellows 18, so that the friction surface position of the main static ring 14 and the active ring 15 is lower than the upper end of the collecting barrel 12, so that the debris generated when the two rotate can be blocked by the collecting barrel 12 to avoid falling into the reactor; the polytetrafluoroethylene bellows 18 can use its creep compensation performance to perform axial compensation on the active ring 15, and can also be used for some glass-lined reactors and reactors with poor equipment accuracy. Eccentric compensation is performed; during adjustment, the axial floating sealing ring 17 is pushed toward the main static ring 14 by screwing the tightening screw 161, and the axial floating sealing ring 17 pushes the active ring 15 by compressing the tightening spring 20, so that the active ring 15 is in close contact with the end face of the main static ring 14 to achieve sealing. When the active ring 15 and the main static ring 14 are worn, the tightening spring 20 can compensate for the axial position of the active ring 15, thereby ensuring the sealing. The compensation stroke and pre-pressure adjustment range are large, and it has the advantage of convenient adjustment.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A single-end mechanical seal device with a collection well, comprising a flange, wherein the center of the flange is provided with an axial hole for a transmission shaft to pass through, characterized in that: The front of the flange is provided with an outwardly extending collecting cylinder, and the outer sleeve of the collecting cylinder is provided with a main static ring fixed to the front of the flange through a pressure cover and an active ring that abuts against the end face of the main static ring and rotates relative to each other; the transmission shaft passes through the collecting cylinder and the outer wall of the passing end is sequentially covered with a locking ring, an axial floating sealing ring, and a polytetrafluoroethylene bellows toward the front direction of the flange, the locking ring is fixed to the outer wall of the transmission shaft, the inner wall of the axial floating sealing ring is provided with a sealing ring that seals with the outer wall of the transmission shaft, and the two ends of the polytetrafluoroethylene bellows are respectively abutted or glued or welded with the end face of the axial floating sealing ring and the end face of the active ring for sealing; the locking ring is provided with a tightening screw for abutting against the axial floating sealing ring to make it approach the front direction of the flange, the outer edge of the end of the polytetrafluoroethylene bellows facing the active ring is provided with a tightening shoulder, the end of the polytetrafluoroethylene bellows facing the active ring is provided with a floating push ring that abuts against the tightening shoulder, and a tightening spring is provided between the axial floating sealing ring and the floating push ring.

2. A single-end mechanical seal device with a collection well according to claim 1, characterized in that: The inner ring walls of the main static ring and the active ring are clearance-matched with the outer wall of the collecting barrel; the inner diameter of the polytetrafluoroethylene bellows is larger than the outer diameter of the collecting barrel.

3. A single-end mechanical seal device with a collection well according to claim 1, characterized in that: The locking ring is composed of two arc-shaped rings that are opposite to each other, and the two arc-shaped rings are locked together and clamped on the outer wall of the transmission shaft by screws.

4. A single-end mechanical seal device with a collection well according to claim 3, characterized in that: A protective sleeve is arranged between the inner wall of the locking ring and the outer wall of the transmission shaft.

5. A single-end mechanical seal device with a collection well according to claim 1, 3 or 4, characterized in that: A plurality of the clamping screws are evenly distributed along the circumferential direction of the locking ring.

6. A single-end mechanical seal device with a collection well according to claim 1, characterized in that: The outer wall of the axial floating sealing ring is provided with a positioning groove; the axial floating sealing ring also includes a transition ring clamped on the positioning groove, the transition ring is composed of two arc rings facing each other, and the two arc rings are locked together in the positioning groove by screws.

7. A single-end mechanical seal device with a collection well according to claim 6, characterized in that: The end of the floating push ring facing the transition ring is provided with a plurality of positioning holes evenly distributed along the circumferential direction thereof, and the clamping spring is located in the positioning hole and abuts against the end surface of the transition ring.

8. A single-end mechanical seal device with a collection well according to claim 1, characterized in that: The outer wall of one end of the main static ring facing the flange is provided with a fixed shoulder, and the gland is pressed on the fixed shoulder.

9. A single-end mechanical seal device with a collection well according to claim 8, characterized in that: Sealing gaskets are arranged between the fixed shoulder and the pressure cover, and between the main static ring and the front face of the flange.

10. A single-end mechanical seal device with a collection well according to claim 9, characterized in that: The front side of the flange is provided with an inwardly concave end face groove, the main static ring is placed in the end face groove, the bottom of the end face groove is provided with a plurality of concentrically offset anti-creep grooves, and the sealing gasket between the main static ring and the front side of the flange is in contact with the bottom of the end face groove.

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