Device for preventing mechanical seal seat of stirrer from being damaged
By setting axial and radial fixing mechanism on the agitator seal seat, the problem of easy damage to the agitator seal seat is solved, extending the service life, reducing the replacement frequency, maintaining the stirring effect and reducing costs.
Patent Information
- Application Number
- CN202420623093.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-28
AI Technical Summary
In petrochemical production, the agitator machine seal seal seat is easily affected by the forces and reaction forces generated by the rotation of the agitator shaft, resulting in fatigue shear breaks of the bolts, causing machine seal leakage, and the existing buffer mechanism increases cost and weight, affecting the stirring effect.
The axial and radial fixing mechanisms are installed on the machine sealing seal seat of the agitator. Through uniformly distributed axial fixing units and radial fixing units, the machine sealing seat is fixed from the axial and radial directions respectively to reduce deflection and The impact of impact force on bolts enhances the stability of the seal seat.
Effectively extend the service life of the machine sealing seat, reduce the replacement frequency, reduce the total weight of the agitator, maintain the stirring effect, and reduce operating costs.
Smart Images
Figure CN222351446U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a device for preventing a sealing seat of a mechanical seal of a stirrer from being damaged. Background Art
[0002] Petrochemical production will involve the issue of boiler flue gas emissions. At present, for environmental protection purposes, the desulfurization standards for flue gas emissions are very strictly controlled. In order to ensure that flue gas emissions meet the desulfurization standards, the desulfurization method of lime slurry circulation absorption is adopted. At the same time, in order to prevent the circulating lime slurry from precipitating and affecting the desulfurization effect, a desulfurization slurry absorption tower is used. The desulfurization slurry absorption tower is equipped with an agitator for uninterrupted stirring, and uninterrupted stirring is prone to mechanical seal leakage.
[0003] One end of the agitator shaft on the agitator is connected to the dynamic ring of the mechanical seal, and the static ring of the mechanical seal assembly is connected to the frame through the mechanical seal seat. Among them, the mechanical seal seat is usually fixed to the frame by axial bolts, because the static ring and the mechanical seal seat do not participate in the rotation, and bolt connection is also a very common connection method. Therefore, in the entire mechanical seal, more attention is often paid to the connection between the dynamic ring and the static ring itself, and the connection between the agitator shaft and the dynamic ring, whether it will cause leakage of the mechanical seal, thereby ignoring whether the connection between the static ring and the frame causes leakage.
[0004] However, in fact, as the stirring shaft rotates and stirs continuously during operation, the direction of rotation, i.e., the force generated by its rotation, is transmitted to the static ring through the dynamic ring part, and then to the mechanical seal seat by the static ring, making the bolts fixing the mechanical seal seat the main force object and affected by the conduction force. In addition, during the stirring process, the stirring shaft contacts the uneven stirring materials at different positions to generate a reaction force, so that the stirring shaft is not only subject to resistance in the direction of rotation, but also to unbalanced forces in other directions such as up, down, or with a certain inclination angle, and these forces are transmitted to the bolts fixing the mechanical seal seat through the static ring. In addition, because the forces in various directions on the bolts cannot offset each other, the bolts are always in an unbalanced force state, causing the bolts to bend. After multiple stirrings of different stirring materials, over time, the main connection positions of all axially installed fixing bolts will be damaged by impact forces in different directions. When the force in a certain direction is too large, it may affect the bolts and cause them to deflect, especially the stirring direction resistance continuously transmitted from the stirring shaft. The direction of this force is opposite to the direction of rotation, and it is also an axial force, which is perpendicular to the axial direction of the bolt fixing the static ring, making it easier for the bolts to deflect and cause fatigue shear fracture. Continuing to stir when the bolts are fatigue shear fractured will further damage the mechanical seal seat and cause leakage of the mechanical seal.
[0005] In order to further prevent the problem of mechanical seal leakage, some people have installed corresponding buffer mechanisms on the agitator shaft and the mechanical seal seat to reduce the leakage caused by the radial or axial shaking of the agitator shaft to the mechanical seal seat. However, this setting not only requires structural improvements to the existing mechanical seal seat, but also requires corresponding changes to the agitator shaft, which not only increases the cost of modification, but more importantly, increases the weight of the agitator shaft, requiring more energy to drive the agitator shaft to rotate. Moreover, the heavier the agitator shaft, the more difficult it is to control the stirring force by changing the rotation speed, which will weaken the stirring effect of the agitator shaft to a certain extent. Utility Model Content
[0006] In order to extend the service life of the mechanical seal seat, an embodiment of the utility model provides a device for preventing the mechanical seal seat of the agitator from being damaged.
[0007] The embodiment of the utility model adopts the following technical scheme: it is installed on an agitator, the agitator includes a mechanical seal, and a stirring shaft connected to the mechanical seal; the mechanical seal includes a dynamic ring and a static ring connected to each other, the dynamic ring is connected to the stirring shaft, and the static ring is connected to the frame through a mechanical seal sealing seat; it is characterized in that: the mechanical seal sealing seat is respectively provided with an axial fixing mechanism and a radial fixing mechanism for connecting to the frame; the axial fixing mechanism is used to reduce the axial deflection of the mechanical seal sealing seat generated when the stirring shaft rotates; the axial fixing mechanism includes a plurality of axial fixing units evenly distributed on the circumferential surface of the mechanical seal sealing seat; the axial fixing unit includes an axial fixing clip and an axial bolt; the axial fixing clip presses against the mechanical seal sealing seat in the axial direction, and a plurality of first threaded holes are provided on the axial fixing clip, and axial bolts matching each first threaded hole are fixedly connected to the frame through the first threaded holes; the radial fixing mechanism is used to reduce the radial deflection of the mechanical seal sealing seat generated when the stirring shaft rotates; The radial fixing mechanism includes a plurality of radial fixing units evenly distributed on the circumferential surface of the mechanical seal seat; the radial fixing unit includes a radial fixing block and a radial bolt; the radial fixing block is fixedly connected to the mechanical seal seat in a radial direction and is provided with a second threaded hole; the radial bolt matches the second threaded hole, passes through the frame and radially inwardly presses the mechanical seal through the second threaded hole.
[0008] Beneficial effect: The radial fixing mechanism and the axial fixing mechanism fix the mechanical seal seat from different directions respectively, and the mechanical seal seat is connected to the frame, so that the axial force and the impact forces in different directions do not need to act on the mechanical seal seat together, thereby preventing the mechanical seal seat from being damaged. Compared with the prior art in which a corresponding buffer mechanism is additionally installed on the stirring shaft and the mechanical seal seat, the mechanical seal seat is reinforced by using the radial fixing mechanism and the axial fixing mechanism, which has low cost and good reinforcement effect.
[0009] Preferably, the radial fixing unit is located in the middle of the side surface of the mechanical seal seat.
[0010] Beneficial effect: The cross sections of the radial fixing units can be located on the same plane, so that the force applied to the mechanical seal seat can be dispersed to the radial fixing units, so as to further protect the mechanical seal seat.
[0011] Preferably, at least one axial fixing unit is included between two adjacent radial fixing units.
[0012] Beneficial effect: the sealing seat of the mechanical seal is further reinforced in the axial direction.
[0013] Preferably, the angle between the axial fixing unit and its adjacent longitudinal fixing unit is no greater than 45°.
[0014] Beneficial effect: The installation position of the axial fixing unit is further limited.
[0015] Preferably, the angle between two adjacent radial fixing units is 90°.
[0016] Beneficial effect: The installation position of the longitudinal fixing unit is further limited.
[0017] Preferably, the radial bolts are M20 type radial bolts.
[0018] Beneficial effects: M20 bolts have a high load-bearing capacity. Due to its large diameter, it can withstand large forces and torques, ensuring the stability and reliability of the connection. Secondly, the disassembly of M20 bolts can be easily disassembled and replaced, which helps to carry out repair and maintenance work smoothly. At the same time, M20 bolts also have the advantages of compact structure, easy installation, small space occupation and low cost.
[0019] Preferably, the axial bolt is an M12 type axial bolt.
[0020] Beneficial effect: The use of M12 axial bolts can ensure the stability of the mechanical seal seat, and because the frame is also fixed with M12 axial bolts, there is no need to make them specially, thus reducing costs.
[0021] Preferably, the weight of the device for preventing the stirrer mechanical seal seat from being damaged does not exceed 3% of the weight of the mechanical seal seat.
[0022] Beneficial effect: The device for preventing the mechanical seal seat of the agitator from being damaged accounts for a small part of the total weight of the mechanical seal seat, which is beneficial to maximally reducing the total weight of the agitator while preventing the mechanical seal seat from being damaged, reducing the load-bearing pressure of the agitator, and ensuring the normal operation of the agitator.
[0023] Beneficial effects of the utility model
[0024] Compared with simultaneously setting up corresponding high-cost and heavy buffer mechanisms on the stirring shaft and the mechanical seal seat, since the static ring is connected to the frame through the mechanical seal seat, the utility model only needs to set up radial fixing mechanisms and axial fixing mechanisms on the mechanical seal seat to connect to the frame, so as to reinforce the mechanical seal seat in different directions, so that the connection between the mechanical seal seat and the frame can be more stable, and the axial force and impact forces in different directions do not need to act on the mechanical seal seat together, so as to achieve the effect of stabilizing the mechanical seal seat, so the modification cost is low.
[0025] At the same time, a device for preventing the mechanical seal seat of the agitator from being damaged is provided with a corresponding radial fixing mechanism and an axial fixing mechanism, so as to minimize the total weight of the agitator while preventing the mechanical seal seat from being damaged. There is no need to expend more additional energy to drive the agitator shaft to rotate, and the intensity of stirring can be controlled without changing the rotation speed.
[0026] In addition, the radial fixing unit is located in the middle of the side of the mechanical seal seat, and the angle between two adjacent radial fixing units is 90°, and the angle between a radial fixing unit and an adjacent axial fixing unit is not greater than 45°. By limiting the installation position of the device for preventing damage to the agitator mechanical seal seat, the cross-sections of the radial fixing units can be on the same horizontal plane, and the symmetry lines of the radial fixing units can pass through the same point, so that when subjected to axial force and impact force in all directions, the forces can be evenly distributed on the radial fixing units, thereby better stabilizing the mechanical seal seat.
[0027] Finally, through long-term application, the replacement rate of the mechanical seal has been reduced from twice a year to once every two years, greatly reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a partial front view of the agitator of the first embodiment;
[0029] Figure 2 It is a partial schematic diagram of the agitator of the first embodiment;
[0030] Figure 3 It is a partial side view of the agitator of the second embodiment;
[0031] Figure 4 It is a partial front view of the agitator of the second embodiment. DETAILED DESCRIPTION
[0032] The reference numerals in the drawings of the specification include:
[0033] Stirring shaft 1, frame 2, fixing ring 21, mechanical seal seat 3, radial bolt 411, radial fixing block 412, axial bolt 421, axial fixing clip 422, impeller 5
[0034] Embodiment 1
[0035] The device for preventing the agitator mechanical seal seat 3 from being damaged is installed on the agitator. The agitator includes a mechanical seal and an agitator shaft 1 connected to the mechanical seal; the mechanical seal includes a dynamic ring and a static ring connected to each other, the dynamic ring is connected to the agitator shaft 1, and the static ring is connected to the frame 2 through the mechanical seal seat 3. In this embodiment, the frame 2 is a cylindrical structure and surrounds the mechanical seal seat 3, and the axial length of the frame 2 is greater than the axial length of the mechanical seal seat 3. For a more vivid description, Figure 2 The shown part includes the portion of the mechanical seal seat 3 which has been surrounded by the frame 2 .
[0036] like Figure 1 As shown, the device for preventing the stirrer mechanical seal seat 3 from being damaged comprises a radial fixing mechanism and an axial fixing mechanism. The direction parallel to the stirring shaft 1 is the axial direction, and the direction perpendicular to the stirring shaft 1 is the radial direction.
[0037] Specifically, in this embodiment, the radial fixing mechanism has a total of 4 radial fixing units, which are respectively located according to Figure 1 The second angle formed by two adjacent radial fixing units to the center of the circle on the circumference of the mechanical seal seat 3 is 90°, that is, the mechanical seal seat 3 is fixed at four different positions of 0°, 90°, 180° and 270°, and as shown in FIG. Figure 2 As shown, each radial fixing unit is installed on the side of the mechanical seal seat 3. The distances from each radial fixing unit to the left end and the right end of the side of the mechanical seal seat 3 are equal, and the distance between each radial fixing unit and the left end of the mechanical seal seat 3 is a, and a is 1 / 2 of the length of the mechanical seal seat 3 in the axial direction, that is, each radial fixing unit is located in the middle of the side of the mechanical seal seat 3.
[0038] By setting the installation position of the above-mentioned radial fixing unit, it is ensured that the four different symmetry lines of the corresponding installation direction of each radial fixing unit in the upper, lower, left and right directions can be in the same plane and form a "cross shape", and all pass through a same point. This same point is exactly the force point where the axial force is concentrated on the mechanical seal seat 3, and the axial force can be distributed to the four radial fixing units in the upper, lower, left and right directions from this same point, so as to maximize the axial force on the mechanical seal seat 3. Transmission to the radial fixing unit reduces the axial force and impact force on the mechanical seal seat 3, and further stabilizes the mechanical seal seat 3.
[0039] like Figure 1As shown, the axial fixing mechanism has a total of 4 axial fixing units, and the first angle formed by the axial fixing unit and its adjacent longitudinal fixing unit to the center of the circle on the circumferential surface of the mechanical seal seat 3 is no more than 45°. The installation positions of the axial fixing units are at 45°, 135°, 225° and 315°, that is, one axial fixing unit is located in the middle position between two adjacent radial fixing units. Figure 2 As shown, each radial fixing unit is installed on the front side of the mechanical seal seat 3. Figure 1 The radial fixed unit in the positive direction of the y-axis is 90° Figure 2 The radial fixed unit is in the positive direction of the x-axis, and the angle is calculated in the clockwise direction.
[0040] In the radial direction, four radial fixing units are used to firmly fix the mechanical seal seat 3 from four directions of up, down, left and right, so as to prevent the mechanical seal seat 3 from being damaged due to vibration in any direction; in the axial direction, an axial fixing unit is provided to further increase the fixing effect, and the axial fixing unit is respectively located between two adjacent radial fixing units, which can work together with the radial fixing unit to disperse the axial force and impact force in all directions to the radial fixing unit, the axial fixing unit and the frame 2 in all directions, so as to prevent the mechanical seal seat 3 from being damaged when the agitator is in continuous operation.
[0041] Specifically, the radial fixing unit includes a radial fixing block 412 and a radial bolt 411. The radial fixing block 412 is a block-shaped three-dimensional structure, which is welded on the mechanical seal seat 3 from the radial direction and is provided with a second threaded hole; the radial bolt 411 matches the second threaded hole, and the side of the frame 2 is provided with a threaded hole matching the thread of the radial bolt 411. The radial bolt 411 passes through the threaded hole in the frame 2 matching the radial bolt 411, and then presses against the mechanical seal seat 3 inward from the radial direction through the second threaded hole.
[0042] The axial fixing unit includes an axial fixing clip 422 and an axial bolt 421. The axial fixing clip 422 presses against the mechanical seal seat 3 and the frame 2 in the axial direction. Two first threaded holes are provided on the axial fixing clip 422. Two axial bolts 421 matching the first threaded holes are connected and fixed to the mechanical seal seat 3 by bolts through the first threaded holes to ensure that the axial fixing clip 422 can press against the mechanical seal seat 3. Among them, the axial bolt 421 is an M12 type axial bolt 421. At the same time, a threaded hole matching the axial bolt 421 is also provided on the frame 2. The axial bolt 421 passes through the mechanical seal seat 3 and then through the threaded hole matching the axial bolt 421 provided on the frame 2, so that the axial bolt 421 can be bolted to the frame 2 to ensure that the axial fixing clip 422 can also press against the frame 2.
[0043] In this embodiment, the weight of the device for preventing the mechanical seal seat 3 of the agitator from being damaged is 3% of the weight of the mechanical seal seat 3. The total weight of the agitator is reduced to the maximum extent, the bearing pressure of the agitator is reduced, and the normal operation of the agitator is ensured.
[0044] like Figure 2 As shown, the impeller 5 is installed on the stirring shaft 1. During the continuous operation of the impeller 5 of the stirrer, the rotation direction of the impeller 5, that is, the force generated by its rotation, is transmitted layer by layer to the mechanical seal seat 3, and also includes the reaction force generated by the contact between the stirring shaft 1 and the uneven stirring objects at different positions, so that the stirring shaft 1 is not only subjected to resistance in the rotation direction, but also to unbalanced forces in other directions such as up, down or with a certain inclination angle, and these forces are transmitted layer by layer to the mechanical seal seat 3, making the mechanical seal seat 3 the main force direction; through the device for preventing the mechanical seal seat 3 from being damaged, the main force direction of the mechanical seal seat 3 is concentrated on the device for preventing the mechanical seal seat 3 from being damaged and the frame 2. At the same time, the device for preventing the mechanical seal seat 3 from being damaged includes a radial fixing mechanism and an axial fixing mechanism, which can fix the mechanical seal seat 3 from different directions, and reduce the deflection of the mechanical seal seat 3 in different directions when the stirring shaft 1 rotates.
[0045] Embodiment 2
[0046] Different from the first embodiment, the frame 2 and the mechanical seal seat 3 do not form a barrel structure. Figure 3 As shown, viewed from the side of the agitator, the mechanical seal seat 3 is located on the right side of the frame 2 and is not surrounded by the frame 2.
[0047] In this embodiment, the frame 2 includes a fixing ring 21, and the fixing ring 21 can be welded to the frame 2. The fixing ring 21 is a rectangular iron plate. Figure 4 As shown, the fixing ring 21 is located between the radial bolt 411 and the radial fixing block 412, and a threaded hole matching the radial bolt 411 is opened on the fixing ring 21. The radial bolt 411 passes through the threaded hole of the fixing ring 21 and the second threaded hole of the radial fixing block 412 to press against the sealing seat 3 of the mechanical seal. The above statement is equivalent to the radial bolt 411 passing through the fixing ring 21 of the frame 2 to press against the sealing seat 3 of the mechanical seal.
[0048] This embodiment is a brief description, and for the parts not described, please refer to the first embodiment.
[0049] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.
[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0051] It should be understood that the term "and / or" used in this article is only a description of the same field of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0052] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.
[0053] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can know all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A device for preventing a stirrer mechanical seal seat from being damaged, installed on a stirrer, wherein the stirrer comprises a mechanical seal and a stirring shaft connected to the mechanical seal; the mechanical seal comprises a dynamic ring and a static ring connected to each other, the dynamic ring is connected to the stirring shaft, and the static ring is connected to a frame through a mechanical seal seat; characterized in that: The mechanical seal seat is provided with an axial fixing mechanism and a radial fixing mechanism for connecting to the frame respectively; Axial fixing mechanism, used to reduce the axial deflection of the mechanical seal seat caused by the rotation of the stirring shaft; The axial fixing mechanism comprises a plurality of axial fixing units evenly distributed on the circumferential surface of the mechanical seal seat; the axial fixing units comprise an axial fixing clip and an axial bolt; The axial fixing clip is pressed against the sealing seat of the machine seal in the axial direction. The axial fixing clip is provided with a plurality of first threaded holes. Axial bolts matching each of the first threaded holes are fixedly connected to the frame through the first threaded holes. The radial fixing mechanism is used to reduce the radial deflection of the mechanical seal seat caused by the rotation of the stirring shaft; The radial fixing mechanism comprises a plurality of radial fixing units evenly distributed on the circumferential surface of the mechanical seal seat; the radial fixing unit comprises a radial fixing block and a radial bolt; A radial fixing block is fixedly connected to the mechanical seal seat in a radial direction and is provided with a second threaded hole; The radial bolt matches the second threaded hole, passes through the frame and radially inwardly presses against the machine seal through the second threaded hole.
2. A device for preventing the sealing seat of a stirrer mechanical seal from being damaged according to claim 1, characterized in that: The radial fixing unit is located in the middle of the side surface of the mechanical seal seat.
3. The device for preventing the seal seat of the stirrer from being damaged according to claim 1, characterized in that: At least one axial fixing unit is included between two adjacent radial fixing units.
4. The device for preventing the seal seat of the stirrer mechanical seal from being damaged according to claim 1, characterized in that: The angle between the axial fixing unit and its adjacent longitudinal fixing unit is not greater than 45°.
5. The device for preventing the seal seat of the stirrer mechanical seal from being damaged according to claim 1, characterized in that: The included angle between two adjacent radial fixing units is 90°.
6. The device for preventing the seal seat of the stirrer mechanical seal from being damaged according to claim 1, characterized in that: The radial bolts are M20 type radial bolts.
7. The device for preventing the seal seat of a stirrer from being damaged according to claim 1, characterized in that: The axial bolt is an M12 type axial bolt.
8. The device for preventing the seal seat of a stirrer from being damaged according to claim 1, characterized in that: The weight of the device for preventing the stirrer mechanical seal seat from being damaged does not exceed 3% of the weight of the mechanical seal seat.