阅读说明：本技术 具有内装内流平衡型自清洁机械密封结构的转子泵 (Rotor pump with built-in internal flow balance type self-cleaning mechanical sealing structure ) 是由 陈道伟 高游顺 吴慧军 朱启发 于 2020-06-04 设计创作，主要内容包括：本发明公开了具有内装内流平衡型自清洁机械密封结构的转子泵,包括传动组件和泵体组件,泵体组件包括泵体和泵头,泵体内设置有由传动组件驱动的主轴和副轴,主轴和副轴延伸到泵头腔体内的部分为悬臂轴,泵头腔体内设置有转子组,转子组分别通过主轴和副轴延伸的悬臂轴传动安装,位于泵体腔体与泵头腔体连接处的悬臂轴部分上套接设置有主机械密封辅机械密封,主机械密封和辅机械密封之间设置有静环座,静环座上设置有与泵体腔体及泵头腔体连通的清洁液进出孔。(The invention discloses a rotor pump with a built-in internal flow balance type self-cleaning mechanical sealing structure, which comprises a transmission assembly and a pump body assembly, wherein the pump body assembly comprises a pump body and a pump head, a main shaft and an auxiliary shaft which are driven by the transmission assembly are arranged in the pump body, the parts of the main shaft and the auxiliary shaft extending into a pump head cavity are cantilever shafts, a rotor set is arranged in the pump head cavity, the rotor set is respectively installed through the transmission of the cantilever shafts extending from the main shaft and the auxiliary shaft, a main mechanical seal and an auxiliary mechanical seal are sleeved on the part, located at the joint of the pump body cavity and the pump head cavity, of the cantilever shaft, a static ring seat is arranged between the main mechanical seal and the auxiliary mechanical seal, and a.)

1. The rotor pump with the built-in internal flow balance type self-cleaning mechanical sealing structure comprises a transmission assembly and a pump body assembly, wherein the pump body assembly comprises a pump body (1) and a pump head (2), a main shaft (3) driven by the transmission assembly is arranged in an inner cavity of the pump body (1), the part of the main shaft (3) extending to the inner cavity of the pump head (2) is a cantilever shaft, a rotor set (5) is arranged in the pump head (2), the rotor set (5) is fixedly installed with the extending cantilever shaft, the rotor pump is characterized in that the main shaft (3) is installed with the pump body (1) and the pump head (2) in a sealing and matching mode through a main mechanical seal (6) and an auxiliary mechanical seal (7), the main mechanical seal (6) is used for sealing media in the pump head cavity, and a self-cleaning cavity is formed between the main mechanical seal (6) and the auxiliary mechanical seal (, the self-cleaning cavity is communicated with a cleaning liquid inlet and outlet hole (9) in the static ring seat, and cleaning liquid is filled in the self-cleaning cavity.

2. The rotodynamic pump having a built-in internal flow balance type self-cleaning mechanical seal structure of claim 1, wherein the main mechanical seal (6) includes a driving ring (601) and a main stationary ring (602), the driving ring (601) is fixed to the rotor (5) by a driving ring driving pin (603) and moves with the rotor (5), and the main stationary ring (602) is adapted to be fitted to the stationary ring seat (8).

3. The rotor pump with the built-in internal flow balance type self-cleaning mechanical seal structure according to claim 2, wherein a driving ring O-shaped seal ring (604) is arranged between the driving ring (601) and the rotor (5), and a first bushing (605) is sleeved on the driving ring driving pin (603).

4. The rotor pump with the self-cleaning mechanical seal structure of the built-in internal flow balance type according to claim 1, wherein the secondary shaft (4) driven by the transmission assembly is further disposed in the inner cavity of the pump body (1), the secondary mechanical seal (7) comprises a secondary ring (701) and a secondary stationary ring (702), the secondary ring (701) is fixed with the primary shaft (3) or the secondary shaft (4) through a secondary ring driving pin (703) and rotates along with the primary shaft (3) or the secondary shaft (4), and the secondary stationary ring (702) is used for being installed in cooperation with the stationary ring seat.

5. The rotor pump having a built-in internal flow balance type self-cleaning mechanical seal structure according to claim 4, wherein a second bushing (704) is provided between the auxiliary ring (701) and the main shaft (3) or the auxiliary shaft (4), and an auxiliary ring O-ring (705) is provided between the second bushing (704) and the auxiliary ring (701) and between the main shaft (3) or the auxiliary shaft (4).

6. The rotory pump having a built-in internal flow balance type self-cleaning mechanical seal structure according to claim 1, wherein a stationary ring O-ring (10) is provided between the stationary ring holder (8) and the main stationary ring (602) and the auxiliary stationary ring (702).

7. The rotodynamic pump having a built-in internal flow balance type self-cleaning mechanical seal structure according to claim 1, wherein the installation height between the main mechanical seal (6) and the auxiliary mechanical seal (7) is less than 50 mm, and the shortest cantilever length of the main shaft (3) and the auxiliary shaft (4) of the pump is ensured.

8. The rotor pump having a built-in internal flow balance type self-cleaning mechanical seal structure according to claim 1, wherein said cleaning liquid inlet and outlet holes (9) are symmetrically provided on said stationary ring base (8).

9. The rotory pump having a built-in internal flow balance-type self-cleaning mechanical seal structure according to claim 1, wherein the transmission assembly includes a motor (11), a reducer (12), and a coupling, which are sequentially disposed, the reducer (12) is fixed to the base (14) by a mounting bracket (13), and the coupling is fixed to the base (14) by a coupling shield (15).

10. The rotory pump having a built-in internal flow balance type self-cleaning mechanical seal structure according to claim 1, wherein the main stationary ring (602) and the auxiliary stationary ring (702) are mounted on the stationary ring base (8) in a double-ended arrangement.

Technical Field

The invention belongs to the technical field of pump bodies, and particularly relates to a rotor pump with a built-in internal flow balance type self-cleaning mechanical sealing structure.

Background

In the known art, existing rotory pump shaft seals for liquid delivery have both balanced and unbalanced mechanical seals. The force borne on the end face of the non-equilibrium mechanical seal is greatly changed along with the rise of the medium pressure, so that the non-equilibrium mechanical seal can only be suitable for low-pressure mechanical seal, the use pressure is less than or equal to 0.8MPa, and the service life of the mechanical seal is greatly reduced when the use pressure is higher than the pressure; the force on the end face of the balance type mechanical seal is less changed along with the rise of the medium pressure, so that the balance type mechanical seal is suitable for high-pressure sealing, and the use pressure can be more than 1.5 MPa.

Notice No. is CN103174647B, discloses a sealed integrated configuration of rotor pump, including the transmission shaft, the right side of transmission shaft is provided with the rotor, and the left side of transmission shaft is provided with the bearing front shroud, and the left side of the periphery rotor of transmission shaft is provided with the adjusting sleeve, and the periphery right side of adjusting sleeve is provided with the pump head, and the periphery left side of adjusting sleeve is provided with quiet ring assembly, and the periphery of quiet ring assembly is provided with quiet ring retaining ring, and the left side of the periphery adjusting sleeve of transmission shaft is provided with the axle sleeve, and the periphery of axle sleeve is provided with the rotating ring subassembly, is provided with ceramic seal between quiet ring assembly.

The dynamic and static ring sealing structure adopted in the structure is characterized in that a built-in ceramic sealing ring is further required to realize sealing, the dynamic and static ring sealing structure is an external structure, a longer extension distance is formed between a sealing end of the dynamic and static ring sealing structure and a cantilever shaft and a rotor assembly part, in some high-precision rotor pumps, especially when the distance between a rotor and an inner cavity wall of a pump head is smaller, the distance between the rotor and the sealing end is longer, the cantilever shaft is relatively longer, the stability of the rotation of the rotor is greatly influenced, therefore, high-precision conveying cannot be realized, and a medium in the inner cavity of the pump head in the sealing structure is in a long-term use process, the medium is easy to permeate, medium crystallization is easy to occur at the sealing end, so that in a long-term use process, the sealing effect of the dynamic and static ring.

In addition, some existing rotor pumps with built-in sealing structures, especially for the rotor pump for conveying high-viscosity media, once the built-in mechanical seal leaks media, the media are more easily solidified and blocked in a sealing cavity, the built-in mechanical seal fails in the long-term use process, and the service life of a sealing end is influenced, so the built-in mechanical seal is usually adopted.

Disclosure of Invention

The invention provides a rotor pump with a built-in internal flow balance type self-cleaning mechanical sealing structure, which aims to solve the problems in the prior art, adopts a double-end sealing structure, is mainly applied to a high-compactness and extremely-small-spacing rotor pump, and can complete self cleaning by utilizing internal cleaning liquid when a medium seeps into a main end seal, thereby avoiding the failure of the main end seal, avoiding the occurrence of medium crystallization and prolonging the service life of the seal.

The invention is realized by the following technical scheme:

rotor pump with built-in internal flow balanced type automatically cleaning mechanical seal structure, including drive assembly and pump body subassembly, pump body subassembly includes the pump body and pump head, be provided with the main shaft by drive assembly driven in the pump body inner chamber, the part that the main shaft extends to the pump head inner chamber is the cantilever axle, be provided with rotor assembly in the pump head, rotor assembly be used for with the cantilever axle fixed mounting that extends, its characterized in that is located the main shaft passes through main mechanical seal, auxiliary mechanical seal and the sealed cooperation installation of pump body and pump head, main mechanical seal is used for realizing the sealed to the internal medium of pump head cavity, main mechanical seal with be formed with the automatically cleaning cavity between the auxiliary mechanical seal, the cleaning solution business turn over hole in automatically cleaning cavity and the quiet ring seat link up, the intussuseption of automatically cleaning cavity is filled with the washing.

Further, the main mechanical seal comprises a driving ring and a main static ring, the driving ring is fixed with the rotor through a driving ring driving pin and moves along with the rotor, and the main static ring is used for being installed in a matched mode with the static ring seat.

Furthermore, a driving ring O-shaped sealing ring is arranged between the driving ring and the rotor, and a first shaft sleeve is sleeved on the driving pin of the driving ring.

Furthermore, an auxiliary shaft driven by a transmission assembly is further arranged in the inner cavity of the pump body, the auxiliary mechanical seal comprises an auxiliary dynamic ring and an auxiliary static ring, the auxiliary dynamic ring is fixed with the main shaft or the auxiliary shaft through an auxiliary dynamic ring driving pin and rotates along with the main shaft or the auxiliary shaft, and the auxiliary static ring is used for being installed in a matched mode with the static ring seat.

And furthermore, a second shaft sleeve is arranged between the auxiliary ring and the main shaft or the auxiliary shaft, and auxiliary ring O-shaped sealing rings are arranged between the second shaft sleeve and the auxiliary ring as well as between the second shaft sleeve and the main shaft or the auxiliary shaft.

Furthermore, all be provided with quiet ring O type sealing washer between quiet ring seat and main quiet ring and the supplementary quiet ring.

Further, the primary mechanical seal is spaced less than 60mm from the secondary mechanical seal.

Furthermore, the cleaning solution inlet and outlet holes are symmetrically arranged on the static ring seat.

Further, the transmission assembly comprises a motor, a speed reducer and a coupler which are sequentially arranged, the speed reducer is fixed on the base through the mounting frame, and the coupler is fixed on the base through the coupler protective cover.

Furthermore, the main stationary ring and the auxiliary stationary ring are both arranged on the stationary ring seat and distributed at two ends.

The invention adopts the built-in mechanical seal, arranges the main mechanical seal at the end part of the rotor, and shortens the distance between the seal end surface and the rotor, thereby shortening the extension length of the cantilever shaft, improving the stability of the rotation of the rotor and being beneficial to the conveying of a high-precision rotor pump; the built-in self-cleaning cavity is realized by utilizing the double-end sealing structure, when the medium seeps into the main end seal, self-cleaning can be completed by utilizing the internal cleaning liquid, the main end seal failure is avoided, the medium crystallization is avoided, and the service life of the seal is prolonged.

Drawings

FIG. 1 is a schematic view of the external structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a pump body;

FIG. 3 is a schematic view of the mounting structure of the main mechanical seal and the auxiliary mechanical seal with the main shaft;

FIG. 4 is a schematic structural view of a stationary ring seat;

in the figure, 1-pump body, 2 pump head, 3-main shaft, 4-auxiliary shaft, 5-rotor, 6-main mechanical seal, 601-driving ring, 602-main static ring, 603-driving ring driving pin, 604-driving ring O-shaped seal ring, 605-first shaft sleeve, 7-auxiliary mechanical seal, 701-auxiliary ring, 702-auxiliary static ring, 703-auxiliary driving pin, 704-second shaft sleeve, 705-auxiliary ring O-shaped seal ring, 8-static ring seat, 9-cleaning liquid inlet and outlet hole, 10-static ring O-shaped seal ring, 11-motor, 12-speed reducer, 13-mounting frame, 14-base and 15-coupler shield.

Detailed Description

The invention is further described in detail and specific embodiments are given below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 4, the rotor pump with the built-in internal flow balance type self-cleaning mechanical sealing structure comprises a transmission assembly and a pump body assembly, wherein the transmission assembly comprises a motor 11, a speed reducer 12 and a coupler which are sequentially arranged, the speed reducer 12 is fixed on a base 14 through an installation frame 13, and the coupler is fixed on the base 14 through a coupler protective cover 15. The pump body subassembly includes the pump body 1 and pump head 2, be provided with main shaft 3 and countershaft 4 by drive assembly driven in the pump body 1, the part that main shaft 3 and countershaft 4 extended to in the pump head cavity 2 is the cantilever shaft, be provided with rotor group 5 in the pump head 2, rotor group 5 is installed through the cantilever shaft transmission that main shaft 3 and countershaft 4 extended respectively, it is provided with main mechanical seal 6 and auxiliary mechanical seal 7 to cup joint on the cantilever shaft part that is located the pump body 1 and pump head 2 junction, be provided with stationary ring seat 8 between main mechanical seal 6 and the auxiliary mechanical seal 7, be provided with the cleaning solution business turn over hole 9 with the pump body 1 and the pump head 2 intercommunication on the stationary ring seat 8, and cleaning solution business turn over hole 9 symmetry sets up on stationary ring seat 8, ensure that the cleaning solution lets in from one of them cleaning solution business turn over hole 9, flow out.

According to the invention, the main mechanical seal 6 and the auxiliary mechanical seal 7 can cool, lubricate and self-clean the dynamic ring and the static ring of the mechanical seal by washing with cleaning liquid, so that a medium is prevented from crystallizing in the pump body, the sealing performance of the dynamic ring and the static ring is ensured, and the service life is prolonged.

As shown in fig. 3, the main mechanical seal 6 includes a driving ring 601 and a main stationary ring 602, the driving ring 601 is fixed with the rotor 5 through a driving ring driving pin 603 and moves together with the rotor 5, the main stationary ring 602 is fixedly disposed in the pump head 2, a driving ring O-ring 604 is disposed between the driving ring 601 and the rotor 5, and a first bushing 605 is sleeved on the driving ring driving pin 603. The auxiliary mechanical seal 7 comprises an auxiliary ring 701 and an auxiliary stationary ring 702, the auxiliary ring 701 is fixed with the main shaft 3 or the auxiliary shaft 4 through an auxiliary ring driving pin 703 and rotates along with the main shaft 3 or the auxiliary shaft 4, the auxiliary stationary ring 702 is fixedly arranged in the pump body 1, a second shaft sleeve 704 is arranged between the auxiliary ring 701 and the main shaft 3 or the auxiliary shaft 4, auxiliary ring O-shaped seal rings 705 are arranged between the second shaft sleeve 704 and the auxiliary ring 701 as well as between the main shaft 3 or the auxiliary shaft 4, and stationary ring O-shaped seal rings 10 are arranged between the stationary ring seat 8 and the main stationary ring 602 as well as between the stationary ring seat 8 and the auxiliary stationary ring 702. And the movable ring O-shaped sealing ring and the static ring O-shaped sealing ring are used for improving the sealing effect.

The stationary ring O-shaped sealing ring 10 is preferably divided into two sealing rings with different specifications, so that the sealing rings can be conveniently and correspondingly matched and installed.

The main shaft 3 or the auxiliary shaft 4 is used for driving the rotor 5 to rotate, the main shaft 3 or the auxiliary shaft 4 extends from the pump body to the inner cavity of the pump head and is installed in a matched mode with the rotor 5, the extending portion is of a cantilever shaft extending structure, the gap between the inner cavity of the pump head and the rotor is extremely small, specifically, the distance between the rotor and the wall of the inner cavity of the pump head is smaller than or equal to 0.2mm, if the cantilever shaft extending from the main shaft 3 or the auxiliary shaft 4 is too long, when the main shaft 3 or the auxiliary shaft 4 rotates easily, the cantilever shaft deflects longitudinally due to the gap matching problem, the rotor 5 is easy to collide with the wall of the inner cavity of the pump head, and faults occur, therefore, the distance between the main mechanical seal 6 and the auxiliary mechanical seal 7 is shortened from the traditional distance larger than 90 mm.

The double-group sealing structure is adopted, the integral sealing effect is improved, the distance between the main mechanical seal and the auxiliary mechanical seal is set to be smaller than 60mm, the transmission stability is improved, the precision is increased, and meanwhile, the main mechanical seal utilizes the centrifugal force formed by the rotation of the shaft, so that the acting force with opposite permeation is generated, and the sealing effect is improved; the static ring seat is arranged, so that cleaning fluid in the static ring seat flows in a circulating manner, and the self-cleaning effect can be achieved while the static ring seat is lubricated.

When the mechanical seal device works, the driving ring 601 of the main mechanical seal 6 moves along with the rotor 5, the main static ring 602 is fixed, and the centrifugal force formed by the rotation of the shaft is utilized to generate an acting force opposite to permeation, so that the sealing effect is improved; the auxiliary ring 701 of the auxiliary mechanical seal 7 rotates along with the main shaft 3 or the auxiliary shaft 4, the auxiliary stationary ring 702 is fixed, and simultaneously, along with the extension of the working time, the medium permeated into the cavity of the pump body and the cleaning liquid circularly flow out together, so that the self-cleaning effect is achieved while the two-way sealing protection is formed.

The working principle of the invention is as follows: according to the technical scheme, in the long-term use process, medium infiltration is easily caused at the main mechanical sealing end, so that medium crystallization is easily caused at the mechanical sealing end, the built-in self-cleaning cavity structure is utilized, warm water or cleaning liquid higher than the normal temperature is injected before the rotor pump is started, pre-preheating is realized, the driving ring and the main static ring can be subjected to pre-preheating treatment, and melting of medium crystallization is facilitated, so that medium crystallization is conveniently cleaned from the sealing end face, dry grinding of the dynamic and static rings after the rotor pump is started is avoided, the rotary sealing effect of the dynamic and static rings is improved by utilizing the pre-preheating cleaning mode, and the service life is prolonged.