Split type shaft holding transmission structure

Abstract

The utility model discloses a kind of split type axle holding transmission structure, belong to mechanical seal technical field, for solving the technical problem of higher requirement of split type transmission ring to shaft sleeve in prior art, the transmission structure includes transmission petal, quantity is multiple, multiple transmission petal head-to-tail detachable connection in turn, the projection of multiple transmission petal in first direction is located on same ring, and the projection of multiple transmission petal in first direction does not overlap, transmission petal includes connecting portion and transmission part, connecting portion is connected with transmission part, transmission part is used for holding pump shaft and abutting tightly shaft sleeve;Locking member, locking member is arranged between every two adjacent transmission petal, for tensioning every two adjacent transmission petal;Positioning member, positioning member is arranged on every transmission petal, for fixed connecting portion, by above structure, transmission petal directly pump shaft, when pump shaft rotates, directly drive transmission petal to rotate, without through the static friction between the deformation of shaft sleeve and pump shaft to drive transmission petal, thereby reduce the requirement to shaft sleeve.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology, specifically relating to a split-type shaft-mounted transmission structure. Background Technology

[0002] A mechanical seal is a device that prevents fluid leakage by maintaining contact and relative sliding between at least one pair of end faces perpendicular to the axis of rotation under the action of fluid pressure, the elastic force (or magnetic force) of the compensation mechanism, and the cooperation of auxiliary seals. For cartridge-type mechanical seals operating at pressures below 3 MPa, the transmission device typically uses a drive ring. A typical structure of a cartridge-type mechanical seal is shown below. Figure 5 As shown, the structure of a typical transmission ring is as follows: Figure 6 As shown, during the high-speed start-up and operation of rotating equipment, the transmission relies on the static friction generated after the set screw is tightened to transmit torque and axial force simultaneously, driving the bushing and rotating ring assembly to rotate, and preventing the bushing from moving axially and causing seal failure. In order to ensure stable and reliable transmission, the selected set screw is usually required to have a hardness slightly higher than that of the pump shaft, so that a pit is formed after tightening to increase friction. However, the pit formed on the shaft surface after the set screw is tightened will push up the nearby metal and damage the shaft. When disassembling and assembling the bushing, the piled-up metal will damage the bushing and the seal ring at the bushing. In addition, the set screw may become loose and slip due to vibration and centrifugal force.

[0003] Therefore, a segmented transmission ring has emerged in the prior art, with the structure as follows: Figure 7 As shown, this type of segmented transmission ring tightens two adjacent segmented rings by tightening the connecting screws, thereby gripping the bushing. After the bushing is deformed by force, it grips the shaft to achieve transmission. However, in order to ensure that the bushing grips the shaft, the segmented transmission ring in the prior art requires a very small gap between the bushing and the shaft, which is inconvenient for installation. Moreover, when the bushing hardness is high, the bushing is not easy to deform, resulting in insufficient gripping force on the shaft. During startup and operation, the bushing is prone to slippage, which leads to seal failure. When the bushing hardness is low, the bushing deforms too much and is not easy to loosen after gripping the shaft, which makes disassembly inconvenient. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned shortcomings in the prior art by providing a segmented shaft-mounted transmission structure to solve the technical problem that the segmented transmission ring in the prior art has high requirements for the bushing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A split-type shaft-mounted transmission structure, comprising: The transmission flaps are multiple in number, and the multiple transmission flaps are detachably connected end to end. The projections of the multiple transmission flaps in the first direction are located on the same ring, and the projections of the multiple transmission flaps in the first direction do not overlap. Each transmission flap includes a connecting part and a transmission part. The connecting part and the transmission part are fixedly connected. The connecting part is used to connect to external objects, and the transmission part is used to hold the pump shaft and abut against the shaft sleeve. A locking element is provided between each of two adjacent transmission segments, and the locking element is used to tighten the two adjacent transmission segments; A positioning element is provided on each of the transmission flaps, and the positioning element is used to fix the connecting part.

[0006] With the above structure, when using the segmented shaft-clamping transmission structure provided by this utility model, multiple transmission segments are first arranged around the bushing and the pump shaft, so that the connecting part is in contact with the outer wall of the bushing, and the transmission part is in contact with the outer wall of the pump shaft. At the same time, the end of the bushing near the transmission part abuts against the side wall of the transmission part. Then, the locking member tightens two adjacent transmission segments. When the locking member tightens two adjacent transmission segments, the transmission parts of multiple transmission segments directly clamp the pump shaft, thereby avoiding the loss of clamping force and reducing damage to the pump shaft. In this way, when the pump shaft rotates, it directly drives the transmission. The transmission disc rotates without relying on static friction between the sleeve and the pump shaft to drive it, thus reducing the requirements on the sleeve. One end of the sleeve abuts against the side wall of the transmission unit, preventing axial movement of the sleeve on the pump shaft. When the locking element tightens two adjacent transmission discs, the connecting parts of multiple transmissions simultaneously grip the sleeve, causing deformation and further tightening the sleeve, increasing friction between the sleeve and the pump shaft. Finally, the positioning element fixes the connecting part to the sleeve. Thus, the rotation of the transmission disc drives the sleeve to rotate synchronously, further reducing the chance of sleeve slippage.

[0007] Furthermore, the connecting part includes a first arc-shaped block, and the transmission part includes a second arc-shaped block. The inner diameter of the first arc-shaped block is larger than the inner diameter of the second arc-shaped block. The first arc-shaped block is fixedly installed on the second arc-shaped block, and the center of the first arc-shaped block and the center of the second arc-shaped block are located on the same straight line.

[0008] By setting the first and second arc-shaped blocks with different inner diameters, the transmission flap has a stepped shape, which makes it easier for the bushing to abut against the side wall of the second arc-shaped block.

[0009] Furthermore, the locking component includes a bolt, and both ends of the transmission flap are provided with screw holes adapted to the bolt, and the axis of the screw holes is tangent to the transmission flap, and the bolt is screwed onto two adjacent transmission flaps.

[0010] Furthermore, the positioning element includes a set screw, and the outer wall of the connecting part has a threaded through hole adapted to the set screw, and the set screw is screwed into the threaded through hole.

[0011] Furthermore, the positioning element includes a protrusion, one side of which is mounted on the inner sidewall of the connecting portion.

[0012] Furthermore, the protrusion is arc-shaped, the outer diameter of the protrusion is equal to the inner diameter of the connecting part, and the center of the protrusion coincides with the center of the connecting part.

[0013] Furthermore, the positioning element includes a pin, and the outer wall of the connecting part has a pin hole adapted to the pin, and the pin is inserted into the pin hole.

[0014] Furthermore, the number of positioning elements is multiple, and the number of positioning elements is not less than the number of transmission segments, and each transmission segment has at least one positioning element.

[0015] The segmented shaft-mounted transmission structure provided by this utility model has the following beneficial effects: (1) By setting up the transmission part, the pump shaft is directly clamped during operation, which reduces the loss of clamping force and thus reduces the requirements for the shaft sleeve; (2) By setting multiple transmission flaps, the damage to the pump shaft and bushing is reduced. Attached Figure Description

[0016] Figure 1 A schematic diagram of the segmented shaft-mounted transmission structure provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 A partial sectional view; Figure 3 A schematic diagram of the segmented shaft-mounted transmission structure provided in Embodiment 1 of this utility model; Figure 4 A schematic diagram of the segmented shaft-mounted transmission structure provided in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of a cartridge-type mechanical seal structure. Figure 6 This is a cross-sectional view of a transmission ring in the prior art; Figure 7 This is a schematic diagram of the structure of a segmented ring in the prior art.

[0017] The attached diagram shows the markings and corresponding component names: 1-Transmission flap, 11-Connecting part, 12-Transmission part, 2-Locking part, 3-Positioning part, 4-Pump shaft, 5-Shaft sleeve. Detailed Implementation

[0018] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0019] Example 1 This utility model embodiment provides a segmented shaft-clamping transmission structure to solve the technical problem of high requirements for the bushing in existing segmented transmission rings. The segmented shaft-clamping transmission structure includes a transmission segment 1, a locking component 2, and a positioning component 3, wherein: refer to Figure 1 and Figure 2 The number of transmission lobe 1 is multiple, and the multiple transmission lobe 1 are detachably connected end to end. The projections of the multiple transmission lobe 1 in the first direction are located on the same ring. Optionally, the first direction is the vertical direction, and the projections of the multiple transmission lobe 1 in the first direction do not overlap, that is, there is a gap between two adjacent transmission lobe 1. In this way, when using the segmented shaft-hugging transmission structure provided in the embodiment of this utility model, it is easier to firmly hold the multiple transmission lobe 1 on the pump shaft 4.

[0020] The transmission disc 1 includes a connecting part 11 and a transmission part 12. The connecting part 11 and the transmission part 12 are fixedly connected. The connecting part 11 is used to connect to external objects, and the transmission part 12 is used to grip the pump shaft 4 and press against the bushing 5. In this way, the transmission part 12 directly grips the pump shaft 4, which not only reduces the loss of gripping force, but also reduces the damage to the pump shaft 4. At the same time, the bushing 5 does not need to generate static friction with the pump shaft 4 through deformation to drive the transmission disc 1, thereby reducing the requirements on the bushing 5.

[0021] Optionally, the number of transmission flaps 1 is two. Two transmission flaps 1 are not only easier to manufacture, but also easier to disassemble and assemble.

[0022] A locking element 2 is provided between each two adjacent transmission lobe 1. The locking element 2 is used to tighten the two adjacent transmission lobe 1. In this way, the transmission lobe 1 is easy to disassemble and assemble by setting the locking element 2.

[0023] Each transmission lobe 1 is provided with a positioning element 3, which is used to fix the connecting part 11. The positioning element 3 makes it easy to fix the connecting part 11 on the bushing 5.

[0024] The connecting part 11 includes a first arc-shaped block, and the transmission part 12 includes a second arc-shaped block. The inner diameter of the first arc-shaped block is larger than that of the second arc-shaped block, that is, the inner sidewall of the transmission lobe 1 has a step. In this way, by setting the step, it abuts against one end of the bushing 5. When the transmission lobe 1 is locked, it abuts against the bushing 5 at the same time, thereby reducing the probability of the bushing 5 being displaced on the pump shaft 4. The first arc-shaped block is fixedly installed on the second arc-shaped block, and the center of the first arc-shaped block and the center of the second arc-shaped block are on the same straight line. Optionally, the first arc-shaped block can be connected together by hot melting or welding. Of course, it can also be integrally formed.

[0025] The locking component 2 includes bolts. Both ends of the transmission lobe 1 are provided with screw holes that are compatible with the bolts. The bolts are screwed onto two adjacent transmission lobe 1s. Optionally, there are multiple bolts, with one bolt between each two adjacent transmission lobe 1s. That is, the number of bolts is equal to the number of transmission lobe 1s. In this way, the bolts make it easier to disassemble and assemble the transmission lobe 1s and to adjust the clamping force of the transmission lobe 1s.

[0026] Optionally, the axis of the screw hole is tangent to the transmission lobe 1, which makes it easier to tighten or loosen the bolt, and at the same time makes the force between two adjacent transmission lobe 1 more uniform.

[0027] The positioning component 3 includes a set screw. The outer wall of the connecting part 11 has a threaded through hole that is compatible with the set screw. The set screw is screwed into the threaded through hole. In this way, the connecting part 11 is fixed on the bushing 5 by setting the set screw, making the connection between the transmission disc 1 and the bushing 5 more stable and easy to disassemble and assemble.

[0028] Optionally, there may be multiple positioning elements 3, the number of positioning elements 3 shall not be less than the number of transmission segments 1, and each transmission segment 1 shall have at least one positioning element 3. This makes it easier to fix each transmission segment 1 and reduce the chance of transmission segment 1 slipping.

[0029] Optionally, the number of positioning elements 3 is a multiple of the number of transmission petals 1. That is, if the number of transmission petals 1 is set to n, the number of positioning elements 3 can be n or 2n. The multiple positioning elements 3 are evenly distributed on the multiple transmission petals 1. In this way, the connection between the transmission petals 1 and the bushing 5 is strengthened by fixing the same transmission petal 1 with multiple positioning elements 3. The evenly distributed positioning elements 3 make the force on the transmission petals 1 more uniform.

[0030] Optionally, refer to Figure 3 The positioning component 3 includes a protrusion, one side of which is plate-shaped on the inner sidewall of the connecting part 11. Specifically, the bushing 5 also has a through hole adapted to the protrusion. During use, the protrusion in the positioning component 3 is inserted into the through hole. The relative rotation between the transmission disc 1 and the bushing 5 is prevented by the setting of the protrusion and the through hole.

[0031] More preferably, the protrusion is arc-shaped, the outer diameter of the protrusion is equal to the inner diameter of the connecting part 11, and the center of the protrusion coincides with the center of the connecting part 11. In this way, the arc-shaped protrusion can better fit with the pump shaft 4.

[0032] Optionally, refer to Figure 4 In this embodiment, the positioning element 3 includes a pin. The outer wall of the connecting part 11 is provided with a pin hole that matches the pin. Specifically, the bushing 5 is also provided with a pin hole that matches the pin. The pin is inserted into the pin hole and the pin hole. The setting of the pin makes it easier to fix the transmission flap 1.

[0033] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A segmented shaft-mounted transmission structure, characterized in that, include: The transmission flaps (1) are multiple in number, and the multiple transmission flaps (1) are detachably connected end to end. The projections of the multiple transmission flaps (1) in the first direction are located on the same ring, and the projections of the multiple transmission flaps (1) in the first direction do not overlap. The transmission flap (1) includes a connecting part (11) and a transmission part (12). The connecting part (11) and the transmission part (12) are fixedly connected. The connecting part (11) is used to connect to external objects, and the transmission part (12) is used to hold the pump shaft (4) and abut against the bushing (5). Locking member (2), the locking member (2) is provided between two adjacent transmission petals (1), the locking member (2) is used to tighten the two adjacent transmission petals (1); Positioning element (3), each of the transmission flaps (1) is provided with the positioning element (3), the positioning element (3) is used to fix the connecting part (11).

2. The segmented shaft-mounted transmission structure according to claim 1, characterized in that, The connecting part (11) includes a first arc-shaped block, and the transmission part (12) includes a second arc-shaped block. The inner diameter of the first arc-shaped block is larger than the inner diameter of the second arc-shaped block. The first arc-shaped block is fixedly installed on the second arc-shaped block, and the center of the first arc-shaped block and the center of the second arc-shaped block are on the same straight line.

3. The segmented shaft-mounted transmission structure according to claim 2, characterized in that, The locking component (2) includes a bolt, and both ends of the transmission lobe (1) are provided with screw holes adapted to the bolt. The bolt is screwed onto two adjacent transmission lobes (1).

4. The segmented shaft-mounted transmission structure according to claim 3, characterized in that, The axis of the screw hole is tangent to the transmission flap (1).

5. The segmented shaft-mounted transmission structure according to claim 2, characterized in that, The positioning component (3) includes a set screw, and the outer side wall of the connecting part (11) is provided with a threaded through hole adapted to the set screw, and the set screw is screwed into the threaded through hole.

6. The segmented shaft-mounted transmission structure according to claim 2, characterized in that, The positioning element (3) includes a protrusion, one side of which is mounted on the inner wall of the connecting part (11).

7. The segmented shaft-mounted transmission structure according to claim 6, characterized in that, The protrusion is arc-shaped, the outer diameter of the protrusion is equal to the inner diameter of the connecting part (11), and the center of the protrusion coincides with the center of the connecting part (11).

8. The segmented shaft-mounted transmission structure according to claim 2, characterized in that, The positioning component (3) includes a pin, and the outer side wall of the connecting part (11) is provided with a pin hole adapted to the pin, and the pin is inserted into the pin hole.

9. The segmented shaft-mounted transmission structure according to any one of claims 4-7, characterized in that, The number of positioning elements (3) is multiple, and the number of positioning elements (3) is not less than the number of transmission flaps (1), and each transmission flap (1) has at least one positioning element (3).

10. The segmented shaft-mounted transmission structure according to claim 9, characterized in that, The number of positioning elements (3) is a multiple of the number of transmission petals (1), and multiple positioning elements (3) are evenly arranged on multiple transmission petals (1).

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