Sealing device for high-temperature heat-conducting oil rotary joint

Abstract

The utility model relates to a sealing device for a high-temperature heat-conducting oil rotary joint, and belongs to the technical field of rotary joints. The spring retainer is installed in the shell and used for fixing the position of the spring, the probability that the spring inclines in the stretching and retracting process is reduced, it is guaranteed that the rotating outer pipe always generates displacement compensation in the axial position in the operation process, it is guaranteed that the hemispherical ring on the rotating outer pipe is always in close contact with the matching face of the graphite spherical surface sealing ring, and the sealing performance is improved. Meanwhile, the groove is formed in the convex face of the bottom cover and used for fixing the graphite spherical surface sealing ring, so that the graphite spherical surface sealing ring cannot move in the radial direction, the sealing performance is improved, the deep groove hole is formed in the bottom cover, the graphite packing is installed for sealing, the double-sealing function is achieved, and the sealing effect is good. The packing gland with the position capable of being axially adjusted is arranged and used for abutting against the graphite packing, once leakage occurs in the production period, a maintainer only needs to adjust the packing gland for pressing, operation is easy and convenient, and efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary joints, and in particular relates to a sealing device for a high-temperature heat-conducting oil rotary joint. Background Art

[0002] Thermal oil, with its excellent heat transfer, energy-saving and safety features, and easy transportation and operation, has been widely used in recent years in cooling and drying equipment and pipelines in industries such as carton production, asphalt coating, textile ironing, insulation materials, and food production. Rotary joints are rotating seals that transport and remove heat transfer media between fixed pipelines and rotating rollers.

[0003] During the use of most existing rotary joints, the rotating inner tube ball sealing surface of the rotary joint and the spherical graphite sealing ring shift, causing the two to not fit tightly together and a gap to form, resulting in failure of the spherical seal and axial leakage of heat transfer oil from the end face. The reasons for the displacement of the spherical sealing surface are as follows: (1) The spring inside the shell is prone to tilt during use, and the spring force cannot act well along the axial direction of the inner tube, causing the spherical sealing surface to shift and fail; (2) The graphite spherical sealing ring of the original rotary joint has no radial fixing parts, and the graphite spherical sealing ring will shift during operation, causing the sealing surface to fail; (3) The sealing of the original rotary joint only relies on the hemispherical ring of the rotating inner tube to press and fit with the graphite spherical sealing ring for sealing. Once the seal fails here, the rotary joint will leak, and maintenance personnel need to stop the machine and disassemble the rotary joint as a whole for maintenance or replacement, which is troublesome and reduces production efficiency. Utility Model Content

[0004] In order to overcome the problem in the background technology that during the use of the rotary joint, the rotating inner tube ball sealing surface and the spherical graphite sealing ring will shift, resulting in the inability to fit completely and tightly between the two and a gap will be generated, which will cause the spherical seal to fail and the end face to leak axially. The maintenance personnel need to stop the machine and disassemble the rotary joint as a whole for maintenance or replacement, which is troublesome and reduces production efficiency. The utility model provides a high-temperature thermal oil rotary joint sealing device; a spring retainer is installed in the shell to fix the position of the spring, which reduces the probability of skewness during the expansion and contraction of the spring and ensures that the rotating outer tube is always in the operation process. Displacement compensation occurs in the axial position to ensure that the hemispherical ring on the rotating outer tube is always in close contact with the mating surface of the graphite spherical sealing ring, thereby maintaining a good sealing effect and preventing leakage of high-temperature thermal oil. At the same time, a groove is provided on the convex surface of the bottom cover to fix the graphite spherical sealing ring, so that it cannot undergo radial displacement, thereby improving the sealing performance. A deep slot is opened in the bottom cover to install graphite packing for sealing, thus realizing a double sealing function. A packing gland with axially adjustable position is provided to tighten the graphite packing. Once leakage occurs during production, the maintenance worker only needs to adjust the packing pressure to tighten it. The operation is simple and efficient.

[0005] To achieve the above-mentioned purpose, the utility model is realized through the following technical solutions: a high-temperature heat-conducting oil rotary joint sealing device mainly comprises a shell, a spring retainer, a spring, a rotating outer tube, an oil-free bearing, a graphite spherical sealing ring, a bottom cover, a graphite packing, a packing gland, a seal, and an inner tube. The end of the shell is provided with an oil inlet joint, and the shell is provided with an oil return joint radially. The rotating outer tube is rotatably installed in the shell through the oil-free bearing, and the end of the oil-free bearing is provided with an annular positioning groove. One end of the spring is embedded in the annular positioning groove of the oil-free bearing, and the other end is installed in the shell through the spring retainer. A hemispherical ring in contact with the end face of the oil-free bearing is provided on the rotating outer tube, and the graphite spherical sealing ring is sleeved on the rotating outer tube, and the spherical surface of the graphite spherical sealing ring is in contact with the hemispherical ring surface. The cover is arranged on the rotating outer tube and fixedly connected to the shell by screws. The contact surfaces of the bottom cover and the shell are sealed by a seal. A groove is provided on the inner end surface of the bottom cover to prevent the graphite spherical sealing ring from shifting. The end of the graphite spherical sealing ring is embedded in the groove. A deep groove hole coaxial with the rotating outer tube is provided on the outer end surface of the bottom cover. The diameter of the deep groove hole is larger than the outer diameter of the rotating outer tube. The graphite packing is arranged on the rotating outer tube and embedded in the deep groove hole. The packing gland is arranged on the rotating outer tube and fixedly connected to the bottom cover by screws. The end face of the packing gland abuts against the graphite packing. An inner tube for conveying high-temperature heat transfer oil is provided inside the rotating outer tube. The inner diameter of the rotating outer tube is larger than the outer diameter of the inner tube. An oil return channel with a ring-shaped cross section is formed between the rotating outer tube and the inner tube. The end of the oil return channel is connected to the shell cavity.

[0006] The spring retainer includes a chassis and an arc-shaped positioning plate. The chassis is provided with a through hole for passing the inner tube. The outer diameter of the chassis is the same as the inner diameter of the shell cavity. Arc-shaped positioning plates for embedding springs are evenly arranged along the circumferential direction on the end surface of the chassis, and one end of the spring is sleeved on the arc-shaped positioning plate.

[0007] The packing gland end face is provided with an annular projection for tightening the graphite packing. The outer diameter of the annular projection is smaller than the diameter of the deep slot hole. The end face of the annular projection presses tightly against the end face of the graphite packing.

[0008] The end of the rotating outer tube is provided with an external thread which is threadably connected to the rotating component.

[0009] The sealing member is a red high-temperature resistant silicone foam board.

[0010] Beneficial effects of the utility model:

[0011] The utility model installs a spring retainer in the shell to fix the position of the spring, reduces the probability of skewing during the expansion and contraction of the spring, ensures that the rotating outer tube always compensates for displacement in the axial position during operation, and ensures that the hemispherical ring on the rotating outer tube is always in close contact with the mating surface of the graphite spherical sealing ring, thereby maintaining a good sealing effect and preventing leakage of high-temperature heat transfer oil. At the same time, a groove is provided on the convex surface of the bottom cover to fix the graphite spherical sealing ring, so that it cannot undergo radial displacement, thereby improving the sealing performance. A deep slot hole is opened in the bottom cover, and a graphite packing is installed for sealing, thereby realizing a double sealing function. A packing pressure cover with an axially adjustable position is provided to tighten the graphite packing. Once leakage occurs during production, the maintenance worker only needs to adjust the packing pressure to tighten it. The operation is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0013] Figure 2 It is an axonometric drawing of the present utility model.

[0014] Figure 3 It is a sectional three-dimensional schematic diagram of the utility model.

[0015] Figure 4 It is a schematic cross-sectional plan view of the present invention.

[0016] Figure 5 This utility model is explosive Figure 1 .

[0017] Figure 6 This utility model is explosive Figure 2 . DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding by technicians.

[0019] The utility model discloses a high-temperature heat-conducting oil rotary joint sealing device, which mainly includes a shell 1, a spring retainer 2, a spring 3, a rotating outer tube 4, an oil-free bearing 5, a graphite spherical sealing ring 6, a bottom cover 7, a graphite packing 8, a packing gland 9, a seal 10, and an inner tube 11. The end of the shell 1 is provided with an oil inlet joint 101, and the shell 1 is provided with an oil return joint 102 in the radial direction. The rotating outer tube 4 is rotatably installed in the shell 1 through the oil-free bearing 5. The end of the oil-free bearing 5 is provided with an annular positioning groove 501. One end of the spring 3 is embedded in the annular positioning groove 501 of the oil-free bearing 5. 01, and the other end is installed in the shell 1 through the spring retainer 2. A hemispherical ring 401 in contact with the end face of the oil-free bearing 5 is provided on the rotating outer tube 4. The graphite spherical sealing ring 6 is sleeved on the rotating outer tube 4, and the spherical surface of the graphite spherical sealing ring 6 is in contact with the spherical surface of the hemispherical ring 401. During the operation of the rotary joint, the spring 3 provides continuous elastic force to ensure that the hemispherical ring 401 on the rotating outer tube 4 is always in close contact with the matching surface of the graphite spherical sealing ring 6, thereby maintaining a good sealing effect and preventing leakage of high-temperature thermal oil; the bottom cover 7 is sleeved on the rotating outer tube 4 and fixedly connected to the shell 1 through screws, and the bottom cover 7 is connected to the shell 1 The contact surfaces are sealed and connected by a seal 10, which can effectively prevent leakage of heat transfer oil from the connection between the bottom cover 7 and the end of the shell 1. The inner end surface of the bottom cover 7 is provided with a groove 701 for preventing the graphite spherical sealing ring 6 from shifting. The end of the graphite spherical sealing ring 6 is embedded in the groove 701, so that the graphite spherical sealing ring 6 cannot undergo radial displacement, thereby avoiding the problem of failure of the sealing surface caused by radial displacement of the graphite spherical sealing ring 6, and improving the sealing performance; the outer end surface of the bottom cover 7 is provided with a deep groove hole 702 coaxial with the rotating outer tube 4, the diameter of the deep groove hole 702 is larger than the outer diameter of the rotating outer tube 4, and the graphite packing 8 is sleeved on the rotating outer tube 4. The outer tube 4 is embedded in the deep groove hole 702. The packing gland 9 is sleeved on the rotating outer tube 4 and fixedly connected to the bottom cover 7 by screws. The end face of the packing gland 9 abuts against the graphite packing 8, which further enhances the sealing performance of the rotary joint. Once leakage occurs during production, the maintenance worker only needs to tighten the packing 8 by adjusting the packing gland 9, which is easy to operate and efficient. An inner tube 11 for conveying high-temperature heat transfer oil is provided inside the rotating outer tube 4. The inner diameter of the rotating outer tube 4 is larger than the outer diameter of the inner tube 11. A return oil channel with a ring-shaped cross section is formed between the rotating outer tube 4 and the inner tube 11. The end of the return oil channel is connected to the cavity of the shell 1.

[0020] The spring retainer 2 includes a chassis 201 and an arc-shaped positioning plate 202. A through hole is provided on the chassis 201 for passing the inner tube 11. The outer diameter of the chassis 201 is the same as the inner diameter of the cavity of the shell 1. Arc-shaped positioning plates 202 for embedding the spring 3 are evenly arranged along the circumferential direction on the end surface of the chassis 201. One end of the spring 3 is sleeved on the arc-shaped positioning plate 202; the setting of the spring retainer 2 enables the rotating outer tube 4 to maintain a stable positioning during the rotation process, reduces the probability of the spring 3 being skewed during the expansion and contraction process, ensures that the rotating outer tube 4 always undergoes displacement compensation in the axial position during operation, and ensures that the hemispherical ring 401 on the rotating outer tube 4 is always in close contact with the mating surface of the graphite spherical sealing ring 6, thereby maintaining a good sealing effect and preventing leakage of high-temperature heat transfer oil.

[0021] An annular protrusion 901 for tightening the graphite packing 8 is provided on the end face of the packing gland 9. The outer diameter of the annular protrusion 901 is smaller than the diameter of the deep groove hole 702. The end face of the annular protrusion 901 is tightly pressed against the end face of the graphite packing 8. The operator tightens the screws between the packing gland 9 and the bottom cover 7 so that the annular protrusion 901 of the packing gland 9 presses against the graphite packing 8. On the one hand, the graphite packing 8 realizes double sealing. On the other hand, it can play the role of properly correcting the rotating outer tube 4, further improving the stability of the rotary joint operation.

[0022] The end of the rotating outer tube 4 is provided with an external thread which is threadedly connected to the rotating component; this makes the installation and disassembly of the rotary joint more convenient, and reduces the time for maintenance and replacement.

[0023] The sealing member 10 is a red high-temperature resistant silicone foam board; the red high-temperature resistant silicone foam board has good high-strength compression resilience, improves the sealing performance, and effectively solves the problem of thermal oil leakage between the bottom cover 7 and the sealing gasket of the shell 1.

[0024] Working process:

[0025] During use, the rotating outer tube 4 is connected to the hollow shaft of the operating equipment, and the inlet of the inner tube 11 is connected to the oil pipe, and the high-temperature heat-conducting oil is injected into the inner tube 11 through the oil pipe. Since the inner tube 11 is provided inside the rotating outer tube 4, the heat-conducting oil can flow into the operating equipment along the inner tube 11, thereby realizing the transportation of the high-temperature heat-conducting oil; the heat-conducting oil after passing through the operating equipment is transported to the cavity of the shell 1 along the return oil channel formed between the rotating outer tube 4 and the inner tube 11, and is discharged through the return oil joint 102, so that the high-temperature heat-conducting oil forms a closed loop inside the rotary joint, which not only ensures the continuous transportation of the heat-conducting oil, but also avoids leakage of the heat-conducting oil; once leakage occurs during production, the maintenance worker only needs to tighten the packing 8 by adjusting the packing cover 9, which is easy to operate and efficient.

[0026] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A high-temperature thermal oil rotary joint sealing device, characterized by: The high-temperature heat-conducting oil rotary joint sealing device comprises a housing (1), a spring retainer (2), a spring (3), a rotary outer tube (4), an oil-free bearing (5), a graphite spherical sealing ring (6), a bottom cover (7), a graphite packing (8), a packing gland (9), a sealing member (10), and an inner tube (11). An oil inlet joint (101) is provided at the end of the housing (1), an oil return joint (102) is provided radially on the housing (1), and the rotary outer tube (4) is rotatably mounted on the housing (1) through the oil-free bearing (5). ), an annular positioning groove (501) is provided at the end of the oil-free bearing (5), one end of the spring (3) is embedded in the annular positioning groove (501) of the oil-free bearing (5), and the other end is installed in the housing (1) through the spring retainer (2), a hemispherical ring (401) in contact with the end face of the oil-free bearing (5) is provided on the rotating outer tube (4), a graphite spherical sealing ring (6) is sleeved on the rotating outer tube (4), and the spherical surface of the graphite spherical sealing ring (6) is in contact with the spherical surface of the hemispherical ring (401), and the bottom cover (7) is sleeved on the rotating outer tube (4) and is fixedly connected to the housing (1) by screws, the contact surface between the bottom cover (7) and the housing (1) is sealed by a seal (10), the inner end surface of the bottom cover (7) is provided with a groove (701) for preventing the graphite spherical sealing ring (6) from shifting, the end of the graphite spherical sealing ring (6) is embedded in the groove (701), the outer end surface of the bottom cover (7) is provided with a deep groove hole (702) coaxial with the rotating outer tube (4), the diameter of the deep groove hole (702) is larger than the outer diameter of the rotating outer tube (4), and the graphite packing (8) is sleeved. The packing gland (9) is provided on the rotating outer tube (4) and embedded in the deep groove hole (702). The packing gland (9) is sleeved on the rotating outer tube (4) and fixedly connected to the bottom cover (7) by screws. The end face of the packing gland (9) abuts against the graphite packing (8). An inner tube (11) for conveying high-temperature heat-conducting oil is provided inside the rotating outer tube (4). The inner diameter of the rotating outer tube (4) is larger than the outer diameter of the inner tube (11). An oil return channel with a ring-shaped cross section is formed between the rotating outer tube (4) and the inner tube (11). The end of the oil return channel is connected to the cavity of the shell (1).

2. A high-temperature thermal oil rotary joint sealing device according to claim 1, characterized in that: The spring retainer (2) includes a chassis (201) and an arc-shaped positioning plate (202). The chassis (201) is provided with a through hole for penetrating the inner tube (11). The outer diameter of the chassis (201) is the same as the inner diameter of the cavity of the housing (1). The end surface of the chassis (201) is evenly provided with arc-shaped positioning plates (202) for embedding the spring (3) along the circumferential direction. One end of the spring (3) is sleeved on the arc-shaped positioning plate (202).

3. A high-temperature thermal oil rotary joint sealing device according to claim 1 or 2, characterized in that: The packing gland (9) has an annular projection (901) on its end face for tightening the graphite packing (8). The outer diameter of the annular projection (901) is smaller than the diameter of the deep slot (702). The end face of the annular projection (901) is tightened against the end face of the graphite packing (8).

4. A high-temperature thermal oil rotary joint sealing device according to claim 1, characterized in that: The end of the rotating outer tube (4) is provided with an external thread that is threadably connected to the rotating component.

5. The high-temperature thermal oil rotary joint sealing device according to claim 1, characterized in that: The sealing member (10) is a red high-temperature resistant silicone foam board.

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