CN214247784U

CN214247784U - Double-end-face sealing device for pump capable of eliminating accumulated errors

Info

Publication number: CN214247784U
Application number: CN202120177920.6U
Authority: CN
Inventors: 于泳水; 于文超; 林海; 邹文玲
Original assignee: Shandong Shuanglun Co Ltd
Current assignee: Shandong Shuanglun Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-09-21
Anticipated expiration: 2031-01-22

Abstract

The utility model relates to a fluid machinery technical equipment field specifically indicates a can eliminate double-end-face sealing device for pump of accumulative error, including the pump shaft, the axle sleeve, preceding seal assembly, back seal assembly and gland, be equipped with preceding seal assembly and back seal assembly between axle sleeve and the gland, be equipped with accumulative error elimination mechanism on the axle sleeve, accumulative error elimination mechanism includes transmission shift fork and mechanical seal spring, transmission shift fork cover on the axle sleeve and with axle sleeve fixed connection, the transmission shift fork is located between preceding seal assembly and the back seal assembly, be equipped with the regulation clearance between transmission shift fork front end and the preceding seal assembly, be equipped with the regulation clearance between transmission shift fork rear end and the back seal assembly, the circumference array has the spring hole on the transmission shift fork, the downthehole mechanical seal spring that is equipped with of spring that is sealed to the machine, the spring both ends are worn out the spring hole and are supported with preceding seal assembly and back seal assembly, the utility model discloses novel structure, The accumulated error can be eliminated, the spring compression amount is unchanged, the safety is high, and the disassembly and the assembly are convenient.

Description

Double-end-face sealing device for pump capable of eliminating accumulated errors

Technical Field

The utility model relates to a fluid machinery technical equipment field specifically indicates a bi-polar face sealing device for pump that can eliminate accumulation error.

Background

The direct-coupled chemical pump has the advantages of simple structure, convenient disassembly, low price and the like, is widely applied in chemical plants, and along with the increasingly wide application of the direct-coupled chemical pump, the conveyed media are also more and more diversified, including conveying high-temperature, toxic and harmful media, and for conveying dangerous, toxic and other harmful media, the mechanical seal of the chemical pump must ensure the safety of medium seal; in addition, the shaft sleeve and the pump shaft are usually fixedly connected through a locking mechanism in the prior art, the installation and operation space is narrow, and the assembly and disassembly are inconvenient.

Disclosure of Invention

The utility model aims at solving the prior art not enough, provide a novel structure, accumulation error can be eliminated, spring compression volume is unchangeable, the security is high, easy dismounting's double-end face sealing device for pump that can eliminate accumulation error.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a can eliminate double-end-face sealing device for pump of accumulated error, includes pump shaft, axle sleeve, preceding seal assembly, back seal assembly and gland, axle sleeve and pump shaft fixed connection, seal assembly and back seal assembly, its characterized in that before being equipped with between axle sleeve and the gland: the shaft sleeve is provided with an accumulated error eliminating mechanism, the accumulated error eliminating mechanism comprises a transmission shifting fork and a mechanical seal spring, the transmission shifting fork is sleeved on the shaft sleeve and fixedly connected with the shaft sleeve, the transmission shifting fork is positioned between the front sealing component and the rear sealing component, an adjusting gap is arranged between the front end of the transmission shifting fork and the front sealing component, an adjusting gap is arranged between the rear end of the transmission shifting fork and the rear sealing component, spring holes are arrayed on the circumference of the transmission shifting fork, a mechanical seal spring is arranged in each spring hole, one end of each mechanical seal spring penetrates through each spring hole to be abutted against the front sealing component, the other end of each mechanical seal spring penetrates through each spring hole to be abutted against the rear sealing component, so as to ensure that the mechanical seal spring always keeps the initial compression amount, cannot be too loose or too tight when the pump runs by adjusting the clearance, meanwhile, the sealing size of a sealing cavity formed by the shaft sleeve and the sealing gland is ensured to be unchanged by adjusting the clearance.

Preceding seal assembly and back seal assembly include rotating ring seat, rotating ring, quiet ring and quiet ring seat respectively, transmission shift fork outer wall front end axial forward extension is equipped with preceding rotating ring, and transmission shift fork outer wall rear end axial backward extension is equipped with back drive ring, be equipped with the rotating ring seat in preceding rotating ring and the back drive ring respectively, rotating ring seat and preceding rotating ring or back drive ring circumference fixed connection, the rotating ring seat cover is on the axle sleeve with axle sleeve sealing connection, be equipped with the regulation clearance between rotating ring seat one end and the transmission shift fork, the other end is fixed and is equipped with the rotating ring, the mechanical seal spring both ends are worn out the spring hole respectively and are leaned on with preceding rotating ring seat and the interior rotating ring seat counterbalance of back drive ring, the rotating ring offsets with quiet ring, rotating ring and quiet ring overlap respectively on the axle sleeve, quiet ring seals fixed connection through quiet ring seat and gland to do benefit to through rotating ring, The movable ring seat, the static ring and the static ring seat form double-end-face sealing.

Be equipped with the retaining ring between rotating ring seat and the transmission shift fork, be equipped with between retaining ring one end and the transmission shift fork and adjust the clearance, the other end leans on with the rotating ring seat counterbalance, the retaining ring is located preceding drive ring or back drive ring intra-annular, retaining ring and preceding drive ring or back drive ring circumference fixed connection, the retaining ring cover is on the axle sleeve with axle sleeve sealing connection, the machine seals spring both ends and wears out the spring hole respectively and leans on with the interior retaining ring counterbalance of back drive ring in the preceding drive ring to do benefit to and further improve transmission nature and leakproofness through the retaining ring.

The pump shaft is the echelonment, the pump shaft includes spacing section of pump shaft and pump shaft linkage segment, spacing section of pump shaft and pump shaft linkage segment fixed connection, the external diameter of the spacing section of pump shaft is less than the external diameter of pump shaft linkage segment, the axle sleeve includes spacing section of axle sleeve and axle sleeve linkage segment, spacing section of axle sleeve and axle sleeve linkage segment fixed connection, the internal diameter of the spacing section of axle sleeve cooperatees with the external diameter of the spacing section of pump shaft, the internal diameter of axle sleeve linkage segment cooperatees with the external diameter of pump shaft linkage segment, the spacing section of axle sleeve is through the spacing section fixed connection of key and pump shaft to when the pump shaft is rotatory, make the spacing section of axle sleeve tightly support on the terminal surface at the pump shaft linkage segment towards the one end terminal surface of axle sleeve linkage segment through the water pressure that pump shaft self produced, need not locking mechanism, connect reliably stably, easy dismounting.

Sealing gland includes quick-witted joint sealing case and machine gland, quick-witted joint sealing case and the sealed fixed connection of machine gland, machine joint sealing inner wall is through preceding seal assembly and axle sleeve connection, machine gland inner wall is through back seal assembly and axle sleeve connection, machine joint sealing outer wall and machine gland outer wall are equipped with the mounting hole respectively to do benefit to the dismouting that makes things convenient for the pump part.

By adopting the above structure, the utility model, have novel structure, accumulation error can eliminate, spring compression volume is unchangeable, the security is high, advantages such as easy dismounting.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a portion of the pump assembly of the present invention.

Reference numerals: the pump shaft comprises a pump shaft 1, a shaft sleeve 2, a front sealing assembly 3, a rear sealing assembly 4, a sealing gland 5, an accumulated error eliminating mechanism 6, a transmission shifting fork 7, a mechanical seal spring 8, a check ring 9, a movable ring seat 10, a movable ring 11, a stationary ring 12, a stationary ring seat 13, a front transmission ring 14, a rear transmission ring 15, a pump shaft limiting section 16, a pump shaft connecting section 17, a shaft sleeve limiting section 18, a shaft sleeve connecting section 19, a mechanical seal box 20, a mechanical seal gland 21, a shell 22, an impeller 23 and a motor connecting disc 24.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.

The utility model provides a can eliminate double-end-face sealing device for pump of accumulative error, includes pump shaft 1, axle sleeve 2, preceding seal assembly 3, back seal assembly 4 and gland 5, axle sleeve 2 and pump shaft 1 fixed connection, seal assembly 3 and back seal assembly 4, its characterized in that before being equipped with between axle sleeve 2 and the gland 5: the shaft sleeve 2 is provided with an accumulated error eliminating mechanism 6, the accumulated error eliminating mechanism 6 comprises a transmission shifting fork 7 and a machine seal spring 8, the transmission shifting fork 7 is sleeved on the shaft sleeve 2 and is fixedly connected with the shaft sleeve 2, the transmission shifting fork 7 is positioned between the front seal assembly 3 and the rear seal assembly 4, an adjusting gap is arranged between the front end of the transmission shifting fork 7 and the front seal assembly 3, an adjusting gap is arranged between the rear end of the transmission shifting fork 7 and the rear seal assembly 4, the transmission shifting fork 7 is circumferentially arrayed with spring holes, the machine seal spring 8 is arranged in the spring hole, one end of the machine seal spring 8 penetrates through the spring hole to abut against the front seal assembly 3, and the other end penetrates through the spring hole to abut against the rear seal assembly 4, so that when the pump runs, the machine seal spring always keeps the initial compression amount and cannot be loosened or tightened too, meanwhile, the sealing size of a sealing cavity formed by the shaft sleeve and the sealing gland is ensured to be unchanged by adjusting the clearance.

The front sealing component 3 and the rear sealing component 4 of the utility model respectively comprise a movable ring seat 10, a movable ring 11, a stationary ring 12 and a stationary ring seat 13, the front end of the outer wall of the transmission fork 7 extends forwards axially to form a front transmission ring 14, the rear end of the outer wall of the transmission fork 7 extends backwards axially to form a rear transmission ring 15, the movable ring seat 10 is arranged in the front transmission ring 14 and the rear transmission ring 15 respectively, the movable ring seat 10 is fixedly connected with the front transmission ring 14 or the rear transmission ring 11 circumferentially, so as to be beneficial to driving the movable ring seat to rotate through the transmission fork, the movable ring seat can be stationary when the fork moves axially, the movable ring seat 10 is sleeved on the shaft sleeve 2 and is in sealing connection with the shaft sleeve 2, an adjusting gap is arranged between one end of the movable ring seat 10 and the transmission fork 7, the other end is fixedly provided with the movable ring 11, two ends of the mechanical sealing spring 8 respectively penetrate through the spring hole and abut against the movable ring seat 10 in the front transmission ring seat 14 and the movable ring seat 10 in the rear ring seat 11, the movable ring 11 is abutted against the static ring 12, the movable ring 11 and the static ring 12 are respectively sleeved on the shaft sleeve 2, and the static ring 12 is fixedly connected with the sealing gland 5 in a sealing way through the static ring seat 13 so as to be beneficial to forming double-end-face sealing through the movable ring, the movable ring seat, the static ring and the static ring seat.

Be equipped with retaining ring 9 between rotating ring seat 10 and the transmission shift fork 7, be equipped with between 9 one ends of retaining ring and the transmission shift fork 7 and adjust the clearance, the other end leans on with rotating ring seat 10 counterbalance, retaining ring 9 is located preceding transmission ring 14 or back transmission ring 15, retaining ring 9 and preceding

transmission ring

14 or 15 circumference fixed connection of back transmission ring to do benefit to and drive the retaining ring rotation through the transmission shift fork, during shift fork axial displacement, retaining ring quiescence simultaneously, retaining ring 9 cover is on axle sleeve 2 with axle sleeve 2 sealing connection, spring hole and preceding transmission ring 14

interior retaining ring

9 and 11 interior retaining ring 9 offsets and lean on of back transmission ring are worn out respectively at machine seal spring 8 both ends, so as to do benefit to further improve transmission nature and leakproofness through the retaining ring.

The pump shaft 1 of the utility model is in ladder shape, the pump shaft 1 comprises a pump shaft limiting section 16 and a pump shaft connecting section 17, the pump shaft limiting section 16 is fixedly connected with the pump shaft connecting section 17, the outer diameter of the pump shaft limiting section 16 is smaller than the outer diameter of the pump shaft connecting section 17, the shaft sleeve 2 comprises a shaft sleeve limiting section 18 and a shaft sleeve connecting section 19, the shaft sleeve limiting section 18 is fixedly connected with the shaft sleeve connecting section 19, the inner diameter of the shaft sleeve limiting section 18 is matched with the outer diameter of the pump shaft limiting section 16, the inner diameter of the shaft sleeve connecting section 19 is matched with the outer diameter of the pump shaft connecting section 17, the shaft sleeve limiting section 18 is fixedly connected with the pump shaft limiting section 16 through a key, so that when the pump shaft rotates, the end face of the shaft sleeve limiting section facing to the shaft sleeve connecting section is tightly pressed against the end face of the pump shaft connecting section through the water pressure generated by the pump shaft itself, the locking mechanism is not needed, and the connection is reliable and stable, the disassembly and the assembly are convenient.

Sealing gland 5 includes quick-witted joint sealing 20 and machine gland 21, the sealed fixed connection of quick-witted joint sealing 20 and machine gland 21, the inner wall of quick-witted joint sealing 20 is connected with axle sleeve 2 through preceding seal assembly 3, machine gland 21 inner wall is connected with axle sleeve 2 through back seal assembly 4, machine joint sealing 20 outer wall and machine gland 21 outer wall are equipped with the mounting hole respectively to do benefit to the dismouting that makes things convenient for the pump part.

As shown in the attached figure 1, a mechanical seal cavity is formed between a machine seal box 20, a machine seal gland 21 and a shaft sleeve 2 in the utility model, the attached figure 2 is a partial structure schematic diagram of the utility model which is installed on a chemical pump when in use, when in assembly, a front seal component 3 and a rear seal component 4 are installed on the shaft sleeve 2, a movable ring 11 and a movable ring seat 10 rotate along with the shaft sleeve 2, a stationary ring 12 and a stationary ring seat 13 do not rotate along with the shaft sleeve 2, the movable ring 11 and the stationary ring 12 form a friction pair, a machine seal spring 8 is installed in a spring hole of a transmission shifting fork 7, then the transmission shifting fork 7 is fixed on the shaft sleeve 2 through screws, simultaneously, a front transmission ring 14 of the transmission shifting fork 7 is sleeved on a check ring 9 of the front seal component 3 and a partial movable ring seat 10 to drive the check ring 9 and the movable ring seat 10 to rotate along with the shaft sleeve 2, a rear transmission ring 15 of the transmission shifting fork 7 is sleeved on the check ring 9 and a partial movable ring seat 10 of the rear seal component 4 to drive the check ring 9 and the movable ring seat 10 to rotate along with the shaft sleeve 2, the static ring seat 13 of the front sealing assembly 3 is fixedly connected with the mechanical sealing box 20 in a sealing manner, the static ring seat 13 of the rear sealing assembly 4 is fixedly connected with the mechanical sealing cover 21 in a sealing manner, the mechanical sealing box 20 is fixedly connected with the mechanical sealing cover 21, the above structures are integrally installed on the pump shaft 1, during installation, the key groove of the shaft sleeve 2 faces to the key on the pump shaft 1 and integrally pushes towards the motor end until the limit section of the shaft sleeve 2 is tightly abutted against the end face of the connecting section of the pump shaft 1 towards the end face of the connecting section of the shaft sleeve 2, the impeller 23 is installed at one end of the pump shaft 1, the motor connecting disc 24 is installed at the other end of the pump shaft 1, the pump shaft 1 is driven by the motor, the shell 22 comprises a pump body and a pump cover, the pump body is fixedly connected with the pump cover, the front end of the impeller 23 is connected with the pump body through a front opening ring and a wear ring, The connection relationship among the pump body, the pump cover and the motor connecting disc 24 is the same as that in the prior art, and is not described in detail,

as shown in fig. 1, theoretically, after the pump is assembled, the size of a mechanical seal cavity formed by a machine seal box 20, a machine seal cover 21 and a shaft sleeve 2 is L, the axial distance between a joint end face a of a pump shaft 1 and the shaft sleeve 2 and a motor flange 24 is L2, and the distance between the machine seal box 20 and the motor flange 24 is L3, but in the machining process, tolerance accumulation of machining sizes of a plurality of pump parts can generate an error of Δ L, if the tolerance accumulation is not adjusted, the compression amount of a spring can be changed, so that the spring is too loose or too tight, and the sealing performance is affected; in order to solve the problem, the utility model discloses a set up transmission shift fork 7 on axle sleeve 2, transmission shift fork 7 passes through the fix with screw on axle sleeve 2, set up mechanical seal spring 8 on transmission shift fork 7, be equipped with between transmission shift fork 7 and the preceding seal assembly 3 and adjust clearance L0, be equipped with between transmission shift fork 7 and the back seal assembly 4 and adjust clearance L1, L0 equals with L1, L0 and L1's clearance can be set for according to the biggest accumulation error, if the biggest accumulation error of processing is delta L, then L0 and L1 all set up and are greater than delta L, the utility model discloses well L0 and L1's numerical range is: 3-5mm, the adjusting method during the assembly of the utility model is as follows:

firstly, when Δ L is positive, accumulated errors cause L2 to increase Δ L, the positions of the mechanical seal box 20, the front seal assembly 3, the rear seal assembly 4, the mechanical seal spring 8 and the mechanical seal cover 21 are kept unchanged during assembly, at the same time, the shaft sleeve 2 and the transmission fork 7 axially move forward by a distance of Δ L relative to the mechanical seal box 20, the front seal assembly 3, the rear seal assembly 4, the mechanical seal spring 8 and the mechanical seal cover 21, so that the distance between the transmission fork 7 and the front seal assembly 3 becomes L0- Δ L, the distance between the transmission fork 7 and the rear seal assembly 4 becomes L1+ Δ L, and L0 and L1 are both greater than Δ L, so the compression amount of the mechanical seal spring 8 is unchanged, because the positions of the mechanical seal box 20, the front seal assembly 3, the rear seal assembly 4, the mechanical seal spring 8 and the mechanical seal cover 21 are kept unchanged, so that the distance from the mechanical seal box 20 to the motor receiving disc 24 is still L3, the size of a mechanical seal cavity formed by the mechanical seal box 20, the mechanical seal gland 21 and the shaft sleeve 2 is also unchanged and is L, so that the influence of accumulated errors is eliminated; secondly, when the delta L is a negative value, the accumulated error causes the L2 to reduce the delta L, the positions of the machine seal box 20, the front seal assembly 3, the rear seal assembly 4, the machine seal spring 8 and the machine seal cover 21 are kept unchanged during assembly, meanwhile, the shaft sleeve 2 and the transmission fork 7 axially move backwards by the delta L distance relative to the machine seal box 20, the front seal assembly 3, the rear seal assembly 4, the machine seal spring 8 and the machine seal cover 21, so that the distance between the transmission fork 7 and the front seal assembly 3 becomes L0+ delta L, the distance between the transmission fork 7 and the rear seal assembly 4 becomes L1-delta L, and L0 and L1 are all larger than delta L, therefore, the compression amount of the machine seal spring 8 is unchanged, because the positions of the machine seal box 20, the front seal assembly 3, the rear seal assembly 4, the machine seal spring 8 and the machine seal cover 21 are kept unchanged, the distance from the machine seal box 20 to the motor receiving disc 24 is still L3, the size of a mechanical seal cavity formed by the mechanical seal box 20, the mechanical seal gland 21 and the shaft sleeve 2 is unchanged, the mechanical seal cavity is L, and the influence of accumulated errors is eliminated, so the accumulated errors generated by processing pump parts in the assembling process are eliminated, the compression amount of a spring is unchanged when the pump runs, the double-end-face sealing performance is good, the shaft sleeve 2 rotates along with the pump shaft 1 through a key when the pump runs, the shaft sleeve 2 drives the transmission shifting fork 7 to rotate, meanwhile, the shaft sleeve 2 is pressed by the liquid pressure P generated by the pump, as shown in figure 1, the axial direction of the shaft sleeve 2 is reliably attached to the pump shaft 1, an additional locking mechanism is not needed, the defects that the installation operation space of a conventional direct-coupled pump is narrow and the disassembly is difficult are overcome, and the operation is quick and convenient.

Claims

1. The utility model provides a can eliminate double-end-face sealing device for pump of accumulated error, includes pump shaft, axle sleeve, preceding seal assembly, back seal assembly and gland, axle sleeve and pump shaft fixed connection, seal assembly and back seal assembly, its characterized in that before being equipped with between axle sleeve and the gland: the shaft sleeve is provided with an accumulation error eliminating mechanism, the accumulation error eliminating mechanism comprises a transmission shifting fork and a mechanical seal spring, the transmission shifting fork is sleeved on the shaft sleeve and fixedly connected with the shaft sleeve, the transmission shifting fork is located between a front seal assembly and a rear seal assembly, an adjusting gap is arranged between the front end of the transmission shifting fork and the front seal assembly, an adjusting gap is arranged between the rear end of the transmission shifting fork and the rear seal assembly, a spring hole is formed in the transmission shifting fork in a circumferential array, the mechanical seal spring is arranged in the spring hole, one end of the mechanical seal spring penetrates out of the spring hole to abut against the front seal assembly, and the other end of the mechanical seal spring penetrates out of the spring hole to abut against the rear seal assembly.

2. The double-end-face seal device for a pump capable of eliminating the accumulated error as set forth in claim 1, wherein: the front sealing assembly and the rear sealing assembly respectively comprise a movable ring seat, a movable ring, a static ring and a static ring seat, the front end of the outer wall of the transmission shifting fork extends forwards in the axial direction to form a front transmission ring, the rear end of the outer wall of the transmission shifting fork extends backwards in the axial direction to form a rear transmission ring, the front transmission ring and the rear transmission ring are respectively internally provided with a movable ring seat, the movable ring seat is fixedly connected with the front transmission ring or the rear transmission ring in the circumferential direction, the movable ring seat is sleeved on the shaft sleeve and is in sealing connection with the shaft sleeve, an adjusting gap is formed between one end of the movable ring seat and the transmission shifting fork, the other end of the movable ring is fixedly provided with the movable ring, two ends of the mechanical seal spring penetrate through a spring hole to abut against the movable ring seat in the front transmission ring and the movable ring seat in the rear transmission ring respectively, the movable ring abuts against the static ring, the movable ring and the static ring are sleeved on the shaft.

3. The double-end-face seal device for a pump capable of eliminating the accumulated error as set forth in claim 2, wherein: the mechanical seal device is characterized in that a check ring is arranged between the movable ring seat and the transmission shifting fork, an adjusting gap is arranged between one end of the check ring and the transmission shifting fork, the other end of the check ring abuts against the movable ring seat, the check ring is located in the front transmission ring or the rear transmission ring, the check ring is fixedly connected with the front transmission ring or the rear transmission ring in the circumferential direction, the check ring is sleeved on the shaft sleeve and is in sealing connection with the shaft sleeve, and two ends of the mechanical seal spring penetrate out of the spring hole respectively to abut against the check ring in the front transmission ring and the check ring in the rear transmission ring.

4. A double-end-face seal for a pump capable of eliminating accumulated errors according to claim 1, 2 or 3, wherein: the pump shaft is the echelonment, the pump shaft includes spacing section of pump shaft and pump shaft linkage segment, spacing section of pump shaft and pump shaft linkage segment fixed connection, the external diameter of the spacing section of pump shaft is less than the external diameter of pump shaft linkage segment, the axle sleeve includes spacing section of axle sleeve and axle sleeve linkage segment, spacing section of axle sleeve and axle sleeve linkage segment fixed connection, the internal diameter of the spacing section of axle sleeve cooperatees with the external diameter of the spacing section of pump shaft, the internal diameter of axle sleeve linkage segment cooperatees with the external diameter of pump shaft linkage segment, the spacing section of axle sleeve is through key and the spacing section fixed connection of pump shaft.

5. The double-end-face seal device for the pump capable of eliminating the accumulated error as set forth in claim 4, wherein: the sealing gland comprises a machine sealing box and a machine sealing gland, the machine sealing box is fixedly connected with the machine sealing gland in a sealing mode, the inner wall of the machine sealing box is connected with a shaft sleeve through a front sealing assembly, the inner wall of the machine sealing gland is connected with the shaft sleeve through a rear sealing assembly, and mounting holes are formed in the outer wall of the machine sealing box and the outer wall of the machine sealing gland respectively.