CN216143173U - Double-end-face mechanical seal for rotary evaporator - Google Patents

Abstract

The utility model discloses a double-end-face mechanical seal for a rotary evaporator, which comprises a shaft sleeve, a first movable ring, a first static ring, a static ring seat, a second static ring, a second movable ring and a movable ring seat, wherein the first movable ring, the first static ring, the static ring seat, the second static ring, the second movable ring and the movable ring seat are sequentially sleeved outside the shaft sleeve; the other end of the first movable ring is assembled at one end of the shaft sleeve in an axially slidable manner; one end of the second stationary ring, which is far away from the stationary ring seat, is abutted against one end of the second movable ring in a relatively rotating manner, the other end of the second movable ring is in sliding fit with the movable ring seat, and the movable ring seat is in transmission connection with the other end of the shaft sleeve; wave springs are arranged between the first movable ring and the shaft sleeve and between the second movable ring and the movable ring seat. The double-end-face mechanical seal for the rotary evaporator provided by the utility model is small in installation size and convenient to assemble and disassemble.

Description

Double-end-face mechanical seal for rotary evaporator

Technical Field

The utility model relates to the technical field of mechanical seal, in particular to a double-end mechanical seal for a rotary evaporator.

Background

The rotary film evaporator is a novel efficient evaporator which can carry out falling film evaporation under the vacuum condition by forcibly forming a film through a rotary scraper. It has large heat transfer coefficient, high evaporation strength, short overflowing time and large operation elasticity, and is especially suitable for evaporation concentration, degassing, desolventizing and distillation purification of thermosensitive materials, high-viscosity materials and easily crystallized particle-containing materials. Therefore, the method is widely applied to the industries of chemical industry, petrifaction, medicine, pesticide, daily chemicals, food, fine chemical industry and the like.

The seal installation cavity of the thin film evaporator has the characteristics of small axial installation size and strong medium corrosivity, so that the traditional mechanical seal cannot be well adapted, and the existing mechanical seal cannot be well satisfied in the aspects of sealing performance and service life. Especially when being applied to the food hygiene field, the requirement on mechanical seal is higher, the requirement on mechanical seal hygiene dead angle is less, the service life is long, the mechanical seal is easy to install and disassemble and the like, and the new challenge is provided for the structural design of the mechanical seal.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve at least one defect in the prior art, and provides the double-end mechanical seal for the rotary evaporator, which has small installation size and convenient disassembly and assembly and can be effectively applied to the seal installation cavity of the thin film evaporator.

The technical scheme adopted by the utility model is as follows: the double-end-face mechanical seal for the rotary evaporator comprises a shaft sleeve, a first movable ring, a first static ring, a static ring seat, a second static ring, a second movable ring and a movable ring seat, wherein the first movable ring, the first static ring, the static ring seat, the second static ring, the second movable ring and the movable ring seat are sequentially sleeved outside the shaft sleeve; the other end of the first movable ring is assembled at one end of the shaft sleeve in an axially slidable manner; one end of the second stationary ring, which is far away from the stationary ring seat, is in relatively rotatable abutting joint with one end of the second movable ring to form an auxiliary seal, and a seal cavity is formed among the main seal, the auxiliary seal and the shaft sleeve; the other end of the second movable ring is in sliding fit with the movable ring seat, and the movable ring seat is in transmission connection with the other end of the shaft sleeve, so that the shaft sleeve, the first movable ring, the first stationary ring, the stationary ring seat, the second stationary ring, the second movable ring and the movable ring seat are assembled into an integral structure; wave springs are arranged between the first movable ring and the shaft sleeve and between the second movable ring and the movable ring seat, so that the first movable ring and the second movable ring always have the tendency of moving towards the first stationary ring and the second stationary ring respectively.

Compared with the prior art, the utility model has the following advantages:

1. double-end-face mechanical sealing is adopted, and two static rings share one static ring seat, so that the sealing installation space is effectively saved; the design can reduce the number of different sealing parts and reduce the inventory pressure of equipment accessories; promote product part utilization ratio, reduce seal structure complexity, make this patent seal structure simpler, reduce sealed use cost when guaranteeing sealing performance, promote product competitiveness.

2. In addition, the elastic compensation elements between the first movable ring and the shaft sleeve and between the second movable ring and the movable ring seat in the structure are all wave springs with smaller axial sizes, and the wave springs can greatly reduce the axial space compared with the traditional cylindrical springs while ensuring the elastic compensation pressure, are not easily influenced by equipment vibration and have better following performance, so that the sealing stability of mechanical sealing can be improved.

3. The mechanical sealing structure adopts a cartridge type design, namely, the integral preassembly of each part of the whole set of sealing device is realized before the mechanical seal is installed in the installation cavity, when the sealing device is installed in the installation cavity of the rotary evaporator, only the seal of the cartridge type structure is required to be integrally installed at a designed position, and the sealing device is connected to the rotating shaft in a driving way, so that the installation operation is simple, the requirement on the installation technology is low, and the working efficiency of assembling the mechanical seal by workers is improved; meanwhile, the sealing damage or failure caused by the installation problem is avoided to the maximum extent; and the sealing maintenance cost is reduced and the maintenance time is saved from another angle.

Furthermore, one end of the shaft sleeve is provided with an annular moving ring installation groove, and an opening of the moving ring installation groove extends towards the other end of the shaft sleeve along the axial direction; the wave spring is assembled between the axial end part of the first movable ring and the bottom of the movable ring mounting groove.

As the improvement, all be equipped with the sealing washer between first rotating ring and the rotating ring mounting groove and between first quiet ring and the quiet ring seat, just the sealing washer sets up on same water flat line. The design can effectively balance the axial bearing of the sealing end face and the part, so that the pressure acts on the dynamic ring and the static ring, the mutual balance is realized, and the sealing face cannot deform.

And the other end of the positioning block is detachably connected with the outer side wall of the movable ring seat, and the working heights of the two wave springs are limited. The locating piece in the above-mentioned structure is used for fixing a position the working height of two wave spring in the whole sealing device promptly whole seal assembly's working height promptly, has realized the location of whole sealing device's settlement working height promptly after the equipment is accomplished, with its installation cavity of packing into after, directly can guarantee sealing device's operating position at the good fixed connection in position that corresponds, need not adjust axial dimension once more, and is very convenient, effectively improves the installation effectiveness.

And the static ring seat is further improved, and a flushing hole communicated with the sealing cavity is formed in the static ring seat. The flushing hole is used for being externally connected with a flushing pipeline to realize that flushing liquid or buffer liquid is circularly introduced into the sealing cavity so as to flush the main sealing surface and the auxiliary sealing surface and avoid crystallization of media on the sealing surfaces; in addition, the heat of the two static rings can be rapidly reduced, the friction heat of the sealing end surfaces of the main seal and the secondary seal is taken away, and the service life of the sealing surface is prolonged.

And the improved structure is characterized in that an installation step is arranged on the outer side of one end, close to the second movable ring, of the movable ring seat, one end, far away from the second stationary ring, of the second movable ring is sleeved outside the installation step, the wave spring is sleeved outside the installation step, and two ends of the wave spring are respectively abutted between the axial end part of the second movable ring and the axial end part of the installation step. In the structure, the waveform sleeve is sleeved outside the limit step and can be limited radially, so that the axial compression deformation of the waveform sleeve is more stable and is not easy to deflect, thereby ensuring more flexibility and stability of elastic compensation between corresponding friction pairs and further improving the sealing performance of the whole sealing device.

Preferably, the first rotating ring, the first stationary ring and the second stationary ring are all made of silicon carbide materials, and the second rotating ring is made of graphite materials. In the structure, the main seal is in direct contact with the medium, so that the first movable ring and the first stationary ring are made of silicon carbide materials with high wear resistance and corrosion resistance, and even if particles in the medium enter the seal surface, the seal surface cannot be abraded; in addition, the auxiliary seal mainly plays a preventive role, in case the main seal leaks, the auxiliary seal plays a role of secondary standby seal, the second movable ring adopts an ink ring, the second stationary ring adopts silicon carbide, a friction pair formed by the two has a higher PV value, and the service life of the mechanical seal can be greatly prolonged.

In another improvement, the first stationary ring and the second stationary ring have the same structure. After the improvement, the first static ring and the second static ring can be used interchangeably, so that the cost is saved; the batch processing production improves the processing efficiency.

Drawings

Fig. 1 is a schematic view of a half-section structure of a double-end-face mechanical seal for a rotary evaporator of the present invention.

Fig. 2 is another angle half-section structure diagram of the double-end-face mechanical seal for the rotary evaporator of the utility model.

Fig. 3 is another angle half-section structure diagram of the double-end-face mechanical seal for the rotary evaporator of the utility model.

Fig. 4 is a schematic structural view of the stationary ring seat of the present invention.

Fig. 5 is a perspective view of a double-ended mechanical seal for a rotary evaporator of the present invention.

Wherein, 01-sealing cavity, 02-flushing hole;

1-shaft sleeve, 1.1-moving ring installation groove, 1.2-connection hole, 2-first moving ring, 2.1-first transmission pin groove, 3-first stationary ring, 4-stationary ring seat, 4.1-first installation groove, 4.2-second installation groove, 5-second stationary ring, 6-second moving ring, 6.1-second transmission pin groove, 7-moving ring seat, 7.1-installation step, 8-wave spring, 9-first transmission pin, 10-positioning block, 11-anti-rotation pin, 12-set screw and 13-second transmission pin.

Detailed Description

The utility model is further described with reference to the following figures and detailed description.

In the description of the present invention, it should be noted that the terms "outer side wall", "inner side wall", "bottom", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, the terms "first" and "second" are used for convenience of description and distinction, and have no specific meaning.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "coupled" are to be interpreted broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the double mechanical seal for a rotary evaporator provided by the utility model comprises a shaft sleeve 1, and a first moving ring 2, a first stationary ring 3, a stationary ring seat 4, a second stationary ring 5, a second moving ring 6 and a moving ring seat 7 which are sequentially sleeved outside the shaft sleeve 1, wherein two axial ends of the stationary ring seat 4 are respectively assembled with the first stationary ring 3 and the second stationary ring 5, specifically, one end of the stationary ring seat 4 is provided with a first mounting groove 4.1, and the first stationary ring 3 is axially slidably assembled in the first mounting groove 4.1; and a corresponding sealing ring is arranged between the radial outer end surface of the first stationary ring 3 and the inner side wall of the first mounting groove 4.1, so that the sealing matching between the first stationary ring and the first mounting groove is realized. Meanwhile, for stable limiting of the sealing ring, a corresponding sealing ring groove is formed in the inner side wall of the first mounting groove 4.1, the outer ring of the sealing ring is accommodated in the sealing ring groove, and the inner ring of the sealing ring is sleeved on the outer side wall of the first stationary ring 3. In addition, in the structure, in order to prevent the first stationary ring 3 and the stationary ring seat 4 from rotating axially after being assembled, the bottom of the first mounting groove 4.1 is provided with the anti-rotation pin 11, and correspondingly, one end of the first stationary ring 3, which is far away from the first rotating ring 2, is provided with the anti-rotation pin slot matched with the anti-rotation pin 11. Similarly, the other end of the stationary ring seat 4 is provided with a second mounting groove 4.2, and the connection mode of the second stationary ring 5 and the second mounting groove 4.2 is the same as the connection mode of the first stationary ring 3 and the rotation-preventing positioning mode, which is not described herein again.

One end of the first stationary ring 3, which is far away from the stationary ring seat 4, is in relatively rotatable abutting joint with one end of the first movable ring 1 to form a main seal; the other end of the first rotating ring 2 is assembled at one end of the shaft sleeve 1 in a sliding way along the axial direction; one end of the second stationary ring 5, which is far away from the stationary ring seat 4, is in relatively rotatable abutting joint with one end of the second movable ring 6 to form an auxiliary seal, and a seal cavity 01 is formed among the main seal, the auxiliary seal and the shaft sleeve 1; the other end of the second movable ring 6 is in sliding fit with the movable ring seat 7, and the movable ring seat 7 is in transmission connection with the other end of the shaft sleeve 1, so that the shaft sleeve 1, the first movable ring 2, the first stationary ring 3, the stationary ring seat 4, the second stationary ring 5, the second movable ring 6 and the movable ring seat 7 are assembled into an integral structure; wave springs 8 are arranged between the first movable ring 2 and the shaft sleeve 1 and between the second movable ring 6 and the movable ring seat 7, so that the first movable ring 2 and the second movable ring 6 always have the tendency of moving towards the first stationary ring 3 and the second stationary ring 5 respectively.

In the structure, the whole mechanical sealing structure adopts a container type design, namely, the integral preassembly of each part of the whole sealing device is realized before the mechanical sealing structure is installed to the installation cavity, in addition, in order to ensure that after the preassembly of the whole mechanical sealing device is completed, each sealing element can be kept at the position of a working state, as shown in fig. 2 and 5, a positioning block 10 is detachably arranged at one end of a static ring seat 4 close to a second static ring 5, the outer side wall of a movable ring seat 7 detachably connected with the other end of the positioning block 10 is used for limiting the working heights of two wave springs 8, namely, the limitation of the working height position of the whole mechanical sealing structure is realized, after the mechanical sealing structure is installed in the installation cavity, the working position of the sealing device can be ensured directly after the corresponding position is fixedly connected, the axial size does not need to be adjusted again, and the installation is very convenient. Specifically, as shown in fig. 2, the number of the positioning blocks 10 is two, the two positioning blocks are arranged in a central symmetry manner, an axially protruding mounting ring is arranged at one end, close to the second stationary ring 5, of the stationary ring seat 4, a limiting groove is formed in the inner side wall of the mounting ring, a limiting protrusion matched with the limiting groove is formed in the outer side wall of one end, close to the stationary ring seat 4, of the two positioning blocks 10, and the other end of each positioning block 10 is connected to the outer side wall of the movable ring seat 7 through a connecting screw. It should be noted that the positioning block 10 in this structure is only used to limit the working height of the mechanical sealing device during pre-installation, and the positioning block 10 needs to be removed after the entire mechanical sealing device is installed in the installation cavity and connected and fixed.

In the above structure, the relative sliding connection between the first rotating ring 2 and the shaft sleeve 1 along the axial direction means that an annular rotating ring mounting groove 1.1 is arranged at one end of the shaft sleeve 1, and the opening of the rotating ring mounting groove 1.1 extends towards the other end of the shaft sleeve 1 along the axial direction; a first transmission pin 9 arranged along the radial direction is arranged on the side wall of the rotating ring mounting groove 1.1, the first rotating ring 2 is slidably assembled in the rotating ring mounting groove 1.1, and a first transmission pin groove 2.1 matched with the first transmission pin 9 is arranged on the side wall of the first rotating ring 2; when the first rotating ring 2 is axially sleeved outside the shaft sleeve 1 and moves to one end of the first rotating ring 2 to be assembled in the rotating ring mounting groove 1.1, the first transmission pin groove 2.1 is correspondingly matched with the first transmission pin 9, and the wave spring 8 is assembled between the axial end part of the first rotating ring 2 and the bottom of the rotating ring mounting groove 1.1 in the structure. In the structure, a sealing ring is also arranged between the outside of the first rotating ring 2 and the inner side wall of the rotating ring mounting groove 1.1, so that the sealing assembly of the first rotating ring 2 and the shaft sleeve 1 is ensured. In another aspect, in the above structure, sealing rings are respectively disposed between the first moving ring 2 and the moving ring mounting groove 1.1 and between the first stationary ring 3 and the stationary ring seat 4, and the sealing rings at two positions are disposed on the same horizontal line along the axial direction of the shaft sleeve 1.

In addition, the movable ring seat 7 is in transmission connection with the other end of the shaft sleeve 1, that is, a plurality of connecting holes 1.2 are uniformly distributed in the circumferential direction on the side wall of the shaft sleeve 1, a plurality of radially extending set screws 12 are uniformly assembled in the circumferential direction at one end of the movable ring seat 7, which is far away from the second movable ring 6, and the set screws 12 are matched with the connecting holes 1.2 of the shaft sleeve 1 in a one-to-one correspondence manner, and after the whole sealing mechanism is installed on the rotating shaft, the corresponding set screws 12 are fixedly fixed on the side wall of the rotating shaft, so that synchronous rotation with the rotating shaft is realized.

As shown in fig. 1, 4 and 5, a flushing hole 02 communicating with the seal chamber 01 is further provided in the stationary ring seat 4. Specifically, be equipped with two on the lateral wall of quiet ring seat 4 along radially communicating to the flushing hole 02 of hole, one of them is the feed liquor hole, and another is for going out the liquid hole, realizes the circulation flow of flush fluid from this, realizes the cooling to first quiet ring 3, second quiet ring 5 through the circulation flow of flush fluid, and the while can also be timely takes away the heat of friction between two friction pairs of main seal, vice sealed, avoids the medium at sealed face crystallization.

As shown in fig. 2 and 3, an installation step 7.1 is arranged on the outer side of one end of the movable ring seat 7 close to the second movable ring 6, one end of the second movable ring 6 far away from the second stationary ring 5 is sleeved outside the installation step 7.1, and a corresponding sealing ring is arranged between the inner side wall of the second movable ring 6 and the outer side wall of the installation step 7.1, so that the sealing assembly of the two parts is ensured. More specifically, as shown in fig. 2, a second driving pin 13 is disposed at an end of the movable ring seat 7 near the second movable ring 6, and a second driving pin slot 6.1 matched with the second driving pin 13 is disposed on an inner hole wall of the second movable ring 6. In the structure, the wave spring 8 is sleeved outside the mounting step 7.1, and two ends of the wave spring 8 respectively abut against between the axial end of the second movable ring 6 and the axial end of the mounting step 7.1, as shown in fig. 3.

On the other hand, in the sealing structure of the present embodiment, the first rotating ring 2, the first stationary ring 3, and the second stationary ring 5 are all made of silicon carbide, and the second rotating ring 6 is made of graphite.

In order to realize the interchange use between the parts, the cost is saved; the batch processing production is convenient, and the processing efficiency is improved; in this embodiment, the first stationary ring 3 and the second stationary ring 5 have the same structure.

In the structure, the main sealing side of the shaft sleeve 1 is close to the medium end, electrochemical polishing is adopted, the roughness reaches Ra0.4 or below, the requirements of the hygiene field are met under the condition of meeting the standards of EH and 3A, and the medium is greatly reduced to be attached to the metal surface to form residues.

The foregoing has described preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary, and various changes made within the scope of the claims of the present invention are within the scope of the present invention.

Claims (8)

1. The utility model provides a double mechanical seal for rotary evaporator, includes axle sleeve (1) and establishes in proper order at outside first rotating ring (2), first quiet ring (3), quiet ring seat (4), the quiet ring of second (5), second rotating ring (6), rotating ring seat (7) of axle sleeve (1), its characterized in that: the two axial ends of the static ring seat (4) are respectively assembled with the first static ring (3) and the second static ring (5), and one end of the first static ring (3) far away from the static ring seat (4) is in butt joint with one end of the first movable ring (2) in a relatively rotating manner so as to form a main seal; the other end of the first movable ring (2) is assembled at one end of the shaft sleeve (1) in a sliding way along the axial direction; one end of the second stationary ring (5) far away from the stationary ring seat (4) is in relatively rotatable abutting joint with one end of the second movable ring (6) to form an auxiliary seal, and a seal cavity (01) is formed among the main seal, the auxiliary seal and the shaft sleeve (1); the other end of the second movable ring (6) is in sliding fit with the movable ring seat (7), and the movable ring seat (7) is in transmission connection with the other end of the shaft sleeve (1), so that the shaft sleeve (1), the first movable ring (2), the first fixed ring (3), the fixed ring seat (4), the second fixed ring (5), the second movable ring (6) and the movable ring seat (7) are assembled into an integral structure; wave springs (8) are arranged between the first movable ring (2) and the shaft sleeve (1) and between the second movable ring (6) and the movable ring seat (7), so that the first movable ring (2) and the second movable ring (6) always have the tendency of moving towards the first static ring (3) and the second static ring (5) respectively.

2. A double mechanical seal for a rotary evaporator according to claim 1, wherein: one end of the shaft sleeve (1) is provided with an annular moving ring installation groove (1.1), and an opening of the moving ring installation groove (1.1) extends towards the other end of the shaft sleeve (1) along the axial direction; the wave spring (8) is assembled between the axial end part of the first movable ring (2) and the bottom of the movable ring mounting groove (1.1).

3. A double mechanical seal for a rotary evaporator according to claim 2, wherein: sealing rings are arranged between the first movable ring (2) and the movable ring mounting groove (1.1) and between the first static ring (3) and the static ring seat (4), and are arranged on the same horizontal line.

4. A double mechanical seal for a rotary evaporator according to claim 1, 2 or 3, wherein: one end of the static ring seat (4) close to the second static ring (5) is detachably provided with a positioning block (10), and the other end of the positioning block (10) is detachably connected with the outer side wall of the movable ring seat (7) and used for limiting the working heights of the two wave springs (8).

5. A double mechanical seal for a rotary evaporator according to claim 4, wherein: and the static ring seat (4) is provided with a flushing hole (02) communicated with the sealing cavity (01).

6. A double mechanical seal for a rotary evaporator according to claim 1, wherein: an installation step (7.1) is arranged on the outer side of one end, close to the second movable ring (6), of the movable ring seat (7), and one end, far away from the second fixed ring (5), of the second movable ring (6) is sleeved outside the installation step (7.1); the wave spring (8) is sleeved outside the mounting step (7.1), and two ends of the wave spring (8) are respectively abutted between the axial end part of the second movable ring (6) and the axial end part of the mounting step (7.1).

7. A double mechanical seal for a rotary evaporator according to claim 1, wherein: first rotating ring (2), first quiet ring (3) and second quiet ring (5) are the carborundum material and make, second rotating ring (6) are made for the graphite material.

8. A double mechanical seal for a rotary evaporator according to claim 1 or 7, wherein: the first stationary ring (3) and the second stationary ring (5) are identical in structure.

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