Magnetic coupling

Abstract

The utility model discloses a magnetic coupling which comprises an outer magnetic mechanism and an inner magnetic mechanism in magnetic coupling with the outer magnetic mechanism. The outer magnetic mechanism comprises a transmission gear, an outer magnetic ring is mounted on the transmission gear, the inner magnetic mechanism comprises an inner magnetic ring magnetically coupled with the outer magnetic ring, and a magnetic suction spacer sleeve is assembled and connected between the outer magnetic ring and the inner magnetic ring; the inner magnetic ring is assembled and connected with a driven shaft; the driven shaft is connected with the inner magnetic ring through a sleeving structure; the sleeving structure comprises an installation sleeve installed on the driven shaft, the installation sleeve comprises an annular base installed on the driven shaft, a sleeve connected with the driven shaft in a sleeving mode is integrally formed on the annular base, and the driven shaft is connected to the inner side of the sleeve in a sleeving mode. The inner magnetic ring is connected to the outer side of the sleeve in a sleeving manner; the annular base is fixedly connected with a plurality of sleeving screws connected with the casing pipes in a sleeving mode. And the driven shaft is sleeved with a mounting sleeve plate packaged on the inner magnetic ring. The device effectively solves the technical problems that the inner magnetic ring and the driven shaft are easy to loosen and the inner magnetic ring is easy to abrade and lose, and the inner magnetic ring is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic couplings, and particularly relates to a magnetic coupling. Background Art

[0002] A magnetic coupling is a coupling that uses magnetic coupling as the driving force. Equivalent to a traditional mechanical coupling, a magnetic coupling is used to couple magnetic forces as the driving force. Therefore, it is applicable to equipment with high sealing requirements, such as oval gear flowmeters. Specifically, in an operating oval gear flowmeter, there is a driven oval gear and a meshing driving oval gear. Under the action of different fluids, the rotational speeds of the oval gears are different, and the flow rate is measured by the different rotational speeds. Specifically, the driving shaft connected to the oval gear transmits power to a rotating shaft through gear meshing, and the rotating shaft transmits the power to a driven shaft installed on the flowmeter through a magnetic coupling, thereby realizing the transmission of the kinetic energy of the oval gear and achieving measurement according to different rotational speeds.

[0003] Sealing is achieved through the non-mechanical connection method of the magnetic coupling.

[0004] Specifically, the inner magnetic ring on the current magnetic coupling is installed on the driven shaft by a clamping method and rotates synchronously with the driven shaft. The outer magnetic ring coupled with the inner magnetic ring is driven by the gear structure on the oval gear flowmeter, and the inner magnetic ring is driven to rotate synchronously under magnetic coupling during the rotation of the outer magnetic ring.

[0005] However, during the operation of the inner magnetic ring, the brittle inner magnetic ring is in a clamped state with the driven shaft for a long time, resulting in the gradual wear and increase of the slot opening of the slot, causing the gradual loosening between the driven shaft and the inner magnetic ring. After loosening, there is a gap, and the rotating inner magnetic ring continuously impacts the convex structure on the driven shaft, further increasing the wear.

[0006] Moreover, more seriously, the loosening between the inner magnetic ring and the driven shaft seriously affects the measurement accuracy. Especially when the flowmeter is applied in an environment with high hydraulic pressure and fast flow rate, the loosening between the driven shaft and the inner magnetic ring is accelerated. Summary of the Utility Model

[0007] Based on the above background, the purpose of the utility model is to provide a magnetic coupling.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A magnetic coupling includes an outer magnetic mechanism and an inner magnetic mechanism magnetically coupled with the outer magnetic mechanism;

[0010] The outer magnetic mechanism includes a transmission gear, an outer magnetic ring is mounted on the transmission gear, the inner magnetic mechanism includes an inner magnetic ring magnetically coupled with the outer magnetic ring, and a magnetic attraction partition sleeve is assembled and connected between the outer magnetic ring and the inner magnetic ring; the inner magnetic ring is assembled and connected with a driven shaft; the driven shaft and the inner magnetic ring are connected through a sleeve structure;

[0011] The sleeve structure includes a mounting sleeve mounted on the driven shaft. The mounting sleeve includes an annular seat mounted on the driven shaft, and a sleeve for sleeving the driven shaft is integrally formed on the annular seat. The driven shaft is sleeved inside the sleeve; the inner magnetic ring is sleeved outside the sleeve;

[0012] A plurality of sleeve screws for sleeving the sleeve are fixedly connected to the annular seat;

[0013] A mounting sleeve plate encapsulated on the inner magnetic ring is sleeved on the driven shaft.

[0014] Preferably, a plurality of long through cavities are formed on the inner magnetic ring, and the outer ends of the sleeve screws penetrate through the long through cavities and are located outside the inner magnetic ring.

[0015] Preferably, a sleeve hole is formed on the mounting sleeve plate, the driven shaft penetrates through the sleeve hole, a plurality of through holes are formed at the edge of the mounting sleeve plate, and the sleeve screws penetrate through the through holes;

[0016] The outer end of the sleeve screw is threadedly connected with a sealing nut fastened to the side wall of the mounting sleeve plate.

[0017] 4Preferably, the mounting sleeve plate and the driven shaft are locked through an elastic locking structure.

[0018] Preferably, the elastic locking structure includes a plurality of elastic locking protrusions elastically mounted at the front end of the driven shaft, and a locking groove adapted to the elastic locking protrusions is formed on the mounting sleeve plate.

[0019] Preferably, the elastic locking protrusion includes a curved locking head, and a sliding part for the spring to slide on the driven shaft is integrally formed on the locking head;

[0020] The locking groove includes a curved groove part adapted to the shape of the locking head. The curved groove part is integrally formed with a sliding retreat groove part. Through the sliding retreat groove part, the locking head slides along the sliding retreat groove part and is pushed into the curved groove part for locking, and the locking head exits along the sliding retreat groove part.

[0021] Preferably, the inner side wall of the annular seat and the rear end position of the driven shaft are locked through an elastic locking structure.

[0022] Preferably, the outer magnetic ring is fixedly connected to the inside of the outer magnetic seat;

[0023] The transmission gear fixedly mounts the outer magnetic seat.

[0024] Preferably, a coupling bracket is rotatably connected to the driven shaft, and the magnetic attraction partition sleeve is fixedly installed on the coupling bracket.

[0025] The utility model has the following beneficial effects:

[0026] 1. The sleeving structure includes a mounting sleeve installed on the driven shaft. The mounting sleeve includes an annular seat installed on the driven shaft, a sleeve integrally formed on the annular seat and sleeving the driven shaft, and the driven shaft is sleeved inside the sleeve; an inner magnetic ring is sleeved outside the sleeve. The size of the sleeve is adapted to the annular hole of the inner magnetic ring, so as to support the inner magnetic ring from the inside. The advantages of this method are as follows: the inner magnetic ring is protected, and it is not easy for the inner magnetic ring to move relative to the sleeve, resulting in impact damage. For example, when there is an eccentric force in mechanical movement, the inner magnetic ring is extremely easy to be damaged by irregular circular movement.

[0027] 2. During the assembly process, when the inner magnetic ring is installed on the annular seat - sleeve and the sleeve screw, at this time, the mounting sleeve plate is sleeved and locked. Under the fastening of multiple sleeve screws, the inner magnetic ring is fully locked. The above structure not only fully locks the inner magnetic ring, but also supports the inner magnetic ring from the inside (supported by the sleeve) and the outside (supported by the sleeve screw), maintaining the stability of the inner magnetic ring rotation. Furthermore, the technical problem of the looseness between the inner magnetic ring and the driven shaft is effectively solved.

[0028] 3. The elastic locking structure realizes sleeving and installation in a very convenient and flexible manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is the overall structure schematic diagram in the embodiment of the present utility model;

[0031] Figure 2 It is the overall structure schematic diagram of the sleeving structure in the embodiment of the present utility model;

[0032] Figure 3 It is the dispersed structure schematic diagram of the sleeving structure in the embodiment of the present utility model;

[0033] Figure 4 It is the structure schematic diagram of the lock groove opened on the annular seat in the embodiment of the present utility model;

[0034] Figure 5This is a schematic structural diagram of the elastic locking structure in the embodiment of the present utility model;

[0035] Figure 6 This is a schematic structural diagram of the locking groove in the embodiment of the present utility model.

[0036] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, the descriptions such as "first" and "second" in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0040] Embodiment 1

[0041] As Figure 1-6 shown, a magnetic coupling, the main structure of the magnetic coupling is: a magnetic coupling commonly used on an existing oval gear flowmeter. The same as the structure of the existing magnetic coupling, the above magnetic coupling includes an outer magnetic mechanism and an inner magnetic mechanism magnetically coupled with the outer magnetic mechanism. Specifically, the outer magnetic mechanism includes a transmission gear 41, the transmission gear 41 is fixedly installed on an outer magnetic seat 43, and the inner side of the outer magnetic seat 42 is fixedly connected to an outer magnetic ring 43. The transmission gear 41 meshes with the gear structure in the flowmeter. When the flowmeter is affected by the fluid, the oval gear in the flowmeter transmits the power to the transmission gear 41 through the gear structure, and the transmission gear 41 drives the outer magnetic seat and the outer magnetic ring 43 to rotate.

[0042] Meanwhile, in the same manner as the existing method, the inner magnetic mechanism includes an inner magnetic ring 23 magnetically coupled with an outer magnetic ring 43. A magnetic attraction partition sleeve 45 is assembled and connected between the outer magnetic ring 43 and the inner magnetic ring 23 (aiming to prevent the inner and outer magnetic rings from sticking together); the inner magnetic ring 23 is assembled and connected with a driven shaft 1. Specifically, in the same manner as the existing magnetic coupling, the driven shaft 1 is rotatably connected with a coupling bracket 46, and the magnetic attraction partition sleeve 45 is fixedly installed on the coupling bracket 46.

[0043] In order to solve the problem that it is easy for the driven shaft 1 and the inner magnetic ring 23 to become loose, resulting in inaccurate measurement and causing relatively large wear and tear to the inner magnetic ring 23, the following improvements are made:

[0044] The driven shaft 1 and the inner magnetic ring 23 are connected through a sleeve structure 2.

[0045] Specifically, the sleeve structure 2 includes a mounting sleeve installed on the driven shaft 1. The mounting sleeve includes an annular seat 22 installed on the driven shaft 1 (a through hole is provided on the annular seat 22), and a sleeve 21 sleeving the driven shaft 1 is integrally formed on the annular seat 22 (the lumen of the sleeve 21 is integrally formed on the through hole). The driven shaft 1 is sleeved inside the sleeve 21; the inner magnetic ring 23 is sleeved outside the sleeve 21. The size of the sleeve 21 is adapted to the ring hole of the inner magnetic ring 23, so as to support the inner magnetic ring 23 from the inside. The advantage of this method is that it can protect the inner magnetic ring 23 and keep the inner magnetic ring 23 from easily moving relative to the sleeve 21, resulting in impact damage. For example, when there is an eccentric force in mechanical movement, the inner magnetic ring 23 is extremely easy to be damaged by impact during irregular circular motion.

[0046] In order to fully lock the inner magnetic ring 23, a plurality of sleeve screws 25 sleeving the sleeve 21 are fixedly connected to the annular seat 22; the sleeve screws 25 are fixed at the edge part of the right side wall of the annular seat 22. Correspondingly, a plurality of long through cavities are provided on the inner magnetic ring 23, and the outer ends of the sleeve screws 25 penetrate through the long through cavities and are located outside the inner magnetic ring 23.

[0047] Meanwhile, a mounting sleeve plate 24 encapsulated on the inner magnetic ring 23 is sleeved on the driven shaft 1. Specifically, a sleeve hole is provided on the mounting sleeve plate 24, the driven shaft 1 penetrates through the sleeve hole, a plurality of through holes are provided at the edge part of the mounting sleeve plate 24, and the sleeve screws 25 penetrate through the through holes; the outer ends of the sleeve screws 25 are threadedly connected with a sealing nut 241 fastened on the side wall of the mounting sleeve plate 24.

[0048] During the assembly process, when the inner magnetic ring 23 is installed on the annular seat 22 - sleeve 21 and the sleeve screws 25, at this time, the mounting sleeve plate 24 is sleeved and locked. Under the fastening of a plurality of sleeve screws 25, the inner magnetic ring 23 is fully locked.

[0049] The above structure realizes both fully locking the inner magnetic ring 23 and supporting the inner magnetic ring 23 from the inner side (supported by the sleeve 21) and the outer side (supported by the sleeved screw 25), maintaining the rotational stability of the inner magnetic ring 23. Furthermore, it effectively solves the technical problem of the looseness between the inner magnetic ring 23 and the driven shaft 1.

[0050] Embodiment 2

[0051] As Figure 1-6 shown, on the basis of the structure of Embodiment 1 in this embodiment, in order to realize the locking between the mounting sleeve plate 24 and the driven shaft 1, an elastic locking structure 3 is provided between the mounting sleeve plate 24 and the driven shaft 1.

[0052] Specifically, the elastic locking structure 3 includes a number of elastic locking protrusions elastically mounted at the front end of the driven shaft 1. Correspondingly, locking grooves 33 adapted to the elastic locking protrusions are formed on the mounting sleeve plate 24. The mounting sleeve plate 24 can be conveniently sleeved and disassembled through the elastic locking of the elastic locking protrusions.

[0053] Specifically, the elastic locking protrusion includes a curved locking head 31, and a sliding part 311 for the spring to slide on the driven shaft 1 is integrally formed on the locking head 31. Correspondingly, a matching cylindrical groove is formed on the driven shaft 1. Similar to the existing elastic telescopic structure, a telescopic small spring 32 is fixedly connected in the cylindrical groove, and the telescopic small spring 32 is fixed at the bottom of the sliding part 311.

[0054] Correspondingly, the locking groove 33 includes a curved groove part 331 adapted to the shape of the locking head 31 (the curved groove part 331 facilitates the cooperation with the curved locking head 31 to achieve locking). At the same time, in order to facilitate the locking of the locking head 31 when the mounting sleeve plate 24 is pushed onto the driven shaft 1, a sliding retreat groove part 332 is integrally formed on the curved groove part 331. Through the sliding retreat groove part 332, during the elastic locking process of the locking head 31, the locking head 31 slides along the sliding retreat groove part 332 and is pushed into the curved groove part 331 for locking. At the same time, when the mounting sleeve plate 24 needs to be removed, it is convenient for the locking head 31 to retreat along the sliding retreat groove part 332, thereby facilitating the removal and disassembly of the mounting sleeve plate 24.

[0055] The above method realizes the locking of the front section of the driven shaft 1. In order to realize the locking of the rear end of the driven shaft 1, in the same way as above, the inner side wall of the annular seat 22 and the rear end position of the driven shaft 1 are locked through the elastic locking structure 3.

[0056] Specifically, a number of the same locking grooves 33 as above are formed on the inner side wall of the annular seat 22. Correspondingly, the rear end of the driven shaft 1 has the same elastic locking protrusions.

[0057] During the assembly process, first assemble the rear end of the driven shaft 1. Specifically, the driven shaft 1 is inserted into the front end of the sleeve 21 and then the elastic locking projection is locked into the locking groove 33 on the annular seat 22. Subsequently, the mounting plate 24 is locked in the above-mentioned manner. Thus, disassembly and installation can be achieved in a very convenient and flexible manner.

[0058] Of course, the above description is not a limitation to the present utility model, and the present utility model is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the substantial scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A magnetic coupling, comprising an external magnetic mechanism and an internal magnetic mechanism magnetically coupled to the external magnetic mechanism; The external magnetic mechanism comprises a transmission gear, the transmission gear is equipped with an external magnetic ring, the internal magnetic mechanism comprises an internal magnetic ring magnetically coupled with the external magnetic ring, a magnetic attraction baffle sleeve is assembled and connected between the external magnetic ring and the internal magnetic ring; the internal magnetic ring is assembled and connected with a driven shaft; It is characterized in that The driven shaft and the inner magnetic ring are connected via a sleeve structure; The sleeve structure comprises a mounting sleeve mounted on the driven shaft, the mounting sleeve comprises an annular seat mounted on the driven shaft, a sleeve sleeved with the driven shaft is integrally formed on the annular seat, the driven shaft is sleeved on the inner side of the sleeve; the inner magnetic ring is sleeved on the outer side of the sleeve; The annular seat is fixedly connected with a plurality of sleeve screws sleeved with the sleeve; The driven shaft is sleeved with a mounting sleeve plate which is encapsulated on the inner magnetic ring.

2. The magnetic coupling according to claim 1, characterized in that: The inner magnetic ring is provided with a plurality of long through cavities, and the outer end of the sleeve screw rod passes through the long through cavities and is located outside the inner magnetic ring.

3. The magnetic coupling according to claim 1, characterized in that: The mounting sleeve is provided with a sleeve hole, the driven shaft passes through the sleeve hole, and the edge of the mounting sleeve is provided with a plurality of through holes, the sleeve screw passes through the through holes; The outer end of the sleeve screw is threadedly connected with a packaging nut which is fastened on the side wall of the mounting sleeve plate.

4. The magnetic coupling according to claim 1, characterized in that: The mounting sleeve plate and the driven shaft are locked by an elastic locking structure.

5. The magnetic coupling according to claim 4, characterized in that: The elastic locking structure comprises a plurality of elastic locking protrusions elastically mounted on the front end of the driven shaft, and the mounting sleeve is provided with locking grooves adapted to the elastic locking protrusions.

6. The magnetic coupling according to claim 5, characterized in that: The elastic locking protrusion comprises a curved locking portion, and the locking portion is integrally formed with a sliding portion for a spring to slide on a driven shaft; The lock groove includes a curved groove portion adapted to the shape of the lock head portion, and the curved groove portion is integrally formed with a slide groove portion, through which the lock head portion slides along the slide groove portion and is pushed into the curved groove portion for locking, and the lock head portion is withdrawn along the slide groove portion.

7. The magnetic coupling according to claim 6, characterized in that: The inner side wall of the annular seat and the rear end position of the driven shaft are locked by an elastic locking structure.

8. The magnetic coupling according to claim 1, characterized in that: The outer magnetic ring is fixedly connected to an outer magnetic seat; The transmission gear is fixedly mounted on the outer magnetic base.

9. The magnetic coupling according to claim 1, characterized in that: The driven shaft is rotatably connected to a coupling bracket, and the magnetic absorption baffle sleeve is fixedly installed on the coupling bracket.

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