Adjustable metal bellows mechanical seal structure

Abstract

The utility model discloses an adjustable metal bellows mechanical seal structure, including connecting assembly, connecting assembly includes locating cylinder, and the inside spigot of locating cylinder has expansion sleeve, and expansion sleeve inside penetrates fastening bolt and is connected with the thread of locating cylinder, and the one side fixed connection of connecting disc is away from expansion sleeve at locating cylinder, and the other side fixed connection of connecting disc has bellows main body, and the other side of bellows main body is connected with sealing assembly, and the outside of bellows main body is sleeved with the protection sleeve of protection cylinder. The utility model discloses the setting of connecting assembly, and the extrusion positioning of shaft body outer wall is completed to expansion sleeve through the inclined abutment surface, compared with the extrusion positioning of circumferential distribution bolt, and the extrusion of expansion sleeve can realize the coaxial extrusion positioning of machine seal, thereby improving the coaxiality and stability of device and shaft body installation, and reducing the occurrence of shaft body bounce.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically an adjustable metal bellows mechanical seal structure. Background Technology

[0002] A bellows mechanical seal is a mechanical sealing device that uses a bellows to achieve elastic compensation and sealing functions. It is mainly used to prevent fluid leakage. Its core component is a welded bellows or a rubber bellows, which combines elastic compensation, sealing and torque transmission functions, thereby achieving adjustable sealing of the device.

[0003] In the prior art, a utility model patent discloses a bellows for mechanical seals (publication number: CN219866275U), which specifically discloses a structure including a bellows body, a connecting plate, and a fixing plate. A through hole is opened on one side of the outer wall of the fixing plate, and a fixing ring is fixedly connected to one side of the outer wall of the bellows body. A rubber ring is fixedly connected to the top of the fixing ring. A threaded hole is opened on the top of the connecting plate. The connecting mechanism includes a movable ring, and two clamping plates are fixedly connected to the top of the fixing ring. This prior art solves the problem that it is inconvenient to maintain and replace the worn rubber ring in existing bellows for mechanical seals.

[0004] However, when installing and fixing the bellows mechanical seal, the connection mechanism is used to fix it to the shaft. However, the compression positioning of the circumferentially distributed bolts makes it easy for the shaft core to shift during installation. This can cause the bellows to resonate due to the shaft's shift and vibration after installation, leading to uneven vibration and damage to the bellows, thus reducing its service life. Utility Model Content

[0005] This invention provides an adjustable metal bellows mechanical seal structure, which aims to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an adjustable metal bellows mechanical seal structure, including a connecting assembly, the connecting assembly including a positioning cylinder, an expansion sleeve inserted inside the positioning cylinder, and a fastening bolt threaded through the expansion sleeve and connected to the positioning cylinder. A connecting plate is fixedly connected to the side of the positioning cylinder away from the expansion sleeve, and a bellows body is fixedly connected to the other side of the connecting plate, and a sealing assembly is connected to the other side of the bellows body. The protective cylinder and protective sleeve are fitted over the outside of the corrugated pipe body.

[0007] As a further optimization, the inner wall of the positioning cylinder is provided with a first inclined abutment surface, and the outer wall of the expansion sleeve is provided with a second inclined abutment surface adapted to the inner wall of the positioning cylinder.

[0008] As a further optimization, the sealing assembly includes a sealing disc, which is fixedly connected to the side of the bellows body away from the connecting disc, and a sealing ring is connected to the inner wall of the sealing disc.

[0009] As a further optimization, the outer walls of the sealing disc and the connecting assembly are provided with adjustment grooves, and the protective cylinder and the protective sleeve are provided with limit rings on the opposite sides, and the limit rings slide against the inside of the adjustment grooves.

[0010] As a further optimization, a pressure cap is mated to the side of the sealing disc away from the bellows body, and a sealing ring is clamped between the sealing disc and the pressure cap.

[0011] As a further optimization, the sealing disc has an insertion hole on the side near the sealing ring, and the pressure cap has a pin on the side near the sealing disc corresponding to the insertion hole.

[0012] As a further optimization, the protective cylinder is slidably sleeved on the outside of the sealing disc, the protective sleeve is slidably sleeved on the outside of the connecting assembly, the protective sleeve is threadedly connected to the outer wall of the protective cylinder, and the outer walls of both the protective cylinder and the protective sleeve are provided with anti-slip textures.

[0013] Compared with the prior art, the beneficial effects of this application are as follows: 1. By setting the connecting components, the expansion sleeve with the inclined contact surface completes the compression positioning of the outer wall of the shaft. Compared with the compression positioning of the circumferentially distributed bolts, the compression of the expansion sleeve can achieve the coaxial compression positioning of the mechanical seal, thereby improving the coaxiality and stability of the device and shaft installation and reducing the occurrence of shaft runout. 2. The plug-in structure enables the sealing ring to be squeezed and positioned, making the sealing ring easier to install and remove, and facilitating subsequent disassembly and maintenance; 3. By using the protective sleeve and protective cover together, the corrugated pipe body can be wrapped and covered, further protecting the corrugated pipe body, reducing the damage caused by external impacts, and further improving its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present utility model.

[0015] Figure 2 This is a schematic diagram of the corrugated pipe main body connection structure of this utility model.

[0016] Figure 3 This is a schematic diagram of a partial explosion of the sealing component of this utility model.

[0017] Figure 4 This is a schematic diagram of the axial cross-sectional structure of this utility model.

[0018] Figure 5 This is a cross-sectional view of the main body of the corrugated pipe of this utility model.

[0019] In the diagram: 1. Connecting assembly; 11. Positioning cylinder; 12. Expansion sleeve; 13. Fastening bolt; 2. Connecting disc; 3. Bellows body; 4. Sealing assembly; 41. Sealing disc; 42. Sealing ring; 43. Pressure cap; 44. Pin; 5. Protective cylinder; 6. Protective sleeve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1 to 5 As shown, this utility model provides an adjustable metal bellows mechanical seal structure, which includes a connecting component 1. The connecting component 1 includes a positioning cylinder 11, an expansion sleeve 12 inserted inside the positioning cylinder 11, and a fastening bolt 13 threadedly connected to the positioning cylinder 11 through the expansion sleeve 12; a connecting plate 2, which is fixedly connected to the side of the positioning cylinder 11 away from the expansion sleeve 12, and a bellows body 3 is fixedly connected to the other side of the connecting plate 2. A sealing component 4 is connected to the other side of the bellows body 3; a protective cylinder 5 and a protective sleeve 6, which are sleeved on the outside of the bellows body 3. Through the setting of the connecting component 1, the device can achieve coaxial installation with the shaft during installation and positioning, reducing shaft runout. At the same time, the protection of the bellows body 3 by the protective cylinder 5 and the protective sleeve 6 can improve the protection of the bellows body 3, reduce the damage to the bellows body 3 from external impacts, and thus improve the sealing performance and safety of the bellows body 3.

[0022] Preferably, the inner wall of the positioning cylinder 11 is provided with a first inclined abutment surface, and the outer wall of the expansion sleeve 12 is provided with a second inclined abutment surface adapted to the inner wall of the positioning cylinder 11. By setting the inclined abutment surface, the expansion sleeve 12 is pressed down, and the expansion sleeve 12 is pressed to complete the squeezing and positioning of the outer wall of the shaft, so as to prevent the shaft from jumping. This can achieve the safety protection of the bellows body 3 and prevent the bellows body 3 from being damaged due to uneven vibration.

[0023] Furthermore, the sealing assembly 4 includes a sealing disc 41, which is fixedly connected to the side of the bellows body 3 away from the connecting disc 2. A sealing ring 42 is connected to the inner wall of the sealing disc 41. Adjustment grooves are provided on the outer walls of both the sealing disc 41 and the connecting assembly 1. Limiting rings are provided on the sides of the protective cylinder 5 and the protective sleeve 6 that are away from each other. The limiting rings slide against the inside of the adjustment grooves. By sliding the limiting rings inside the adjustment grooves, the protective cylinder 5 and the protective sleeve 6 can adapt to the expansion and contraction of the bellows body 3 and make adaptive displacements, thereby ensuring the safe wrapping of the bellows body 3 by the protective cylinder 5 and the protective sleeve 6.

[0024] Furthermore, a pressure cap 43 is connected to the side of the sealing disc 41 away from the bellows body 3, and the sealing ring 42 is clamped between the sealing disc 41 and the pressure cap 43. The sealing disc 41 has an insertion hole on the side near the sealing ring 42, and the pressure cap 43 has a pin 44 corresponding to the insertion hole on the side near the sealing disc 41. By inserting the pin 44 into the insertion hole of the sealing disc 41, the sealing ring 42 can be squeezed and positioned, thereby completing the auxiliary positioning of the sealing ring 42. At the same time, the connection structure of the pressure cap 43 facilitates the disassembly and maintenance of the sealing ring 42, further improving the convenience of later maintenance of the equipment.

[0025] Preferably, the protective cylinder 5 is slidably sleeved on the outside of the sealing disc 41, and the protective sleeve 6 is slidably sleeved on the outside of the connecting assembly 1. The protective sleeve 6 is threadedly connected to the outer wall of the protective cylinder 5. The outer walls of both the protective cylinder 5 and the protective sleeve 6 are provided with anti-slip textures. Through the threaded connection between the protective cylinder 5 and the protective sleeve 6, they can be adapted to the corrugated pipe body 3 of different heights for protection. At the same time, the anti-slip textures on the outside of the protective cylinder 5 and the protective sleeve 6 facilitate the adjustment of the threaded connection between the two.

[0026] Working principle: First, the device is installed and fixed so that it is sleeved on the outer wall of the shaft. Then, the fastening bolt 13 is rotated by thread, so that the expansion sleeve 12 is compressed and positioned on the outer wall of the shaft. This achieves the installation and fixation of the device and the shaft, and further ensures the coaxiality of the device and the shaft, preventing the shaft from running and ensuring the rotational stability of the shaft.

[0027] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An adjustable metal bellows mechanical seal structure, characterized in that: The system includes a connecting component (1), which includes a positioning cylinder (11). An expansion sleeve (12) is inserted inside the positioning cylinder (11), and a fastening bolt (13) passes through the expansion sleeve (12) and is threadedly connected to the positioning cylinder (11). Connecting disc (2), the connecting disc (2) is fixedly connected to the side of the positioning cylinder (11) away from the expansion sleeve (12), and the other side of the connecting disc (2) is fixedly connected to the bellows body (3), and the other side of the bellows body (3) is connected to the sealing component (4). The protective cylinder (5) and the protective sleeve (6) are fitted over the outside of the corrugated pipe body (3).

2. The adjustable metal bellows mechanical seal structure according to claim 1, characterized in that: The inner wall of the positioning cylinder (11) is provided with a first inclined abutment surface, and the outer wall of the expansion sleeve (12) is provided with a second inclined abutment surface adapted to the inner wall of the positioning cylinder (11).

3. The adjustable metal bellows mechanical seal structure according to claim 1, characterized in that: The sealing assembly (4) includes a sealing disc (41), which is fixedly connected to the side of the bellows body (3) away from the connecting disc (2), and the inner wall of the sealing disc (41) is connected with a sealing ring (42).

4. The adjustable metal bellows mechanical seal structure according to claim 3, characterized in that: The outer walls of the sealing disc (41) and the connecting assembly (1) are provided with adjustment grooves. The protective cylinder (5) and the protective sleeve (6) are provided with limit rings on the opposite sides of each other, and the limit rings slide against the inside of the adjustment grooves.

5. The adjustable metal bellows mechanical seal structure according to claim 4, characterized in that: The sealing disc (41) is connected to the pressure cap (43) on the side away from the bellows body (3), and the sealing ring (42) is clamped between the sealing disc (41) and the pressure cap (43).

6. The adjustable metal bellows mechanical seal structure according to claim 5, characterized in that: The sealing disc (41) has an insertion hole on the side near the sealing ring (42), and the pressure cap (43) has a pin (44) on the side near the sealing disc (41) corresponding to the insertion hole.

7. The adjustable metal bellows mechanical seal structure according to claim 4, characterized in that: The protective cylinder (5) is slidably sleeved on the outside of the sealing disc (41), and the protective sleeve (6) is slidably sleeved on the outside of the connecting assembly (1). The protective sleeve (6) is threadedly connected to the outer wall of the protective cylinder (5). The outer walls of both the protective cylinder (5) and the protective sleeve (6) are provided with anti-slip textures.

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