A rotary joint assembly

Abstract

This utility model relates to a rotary joint assembly, including a rotary joint for internal thread connection with the crusher gear. The rotary joint is fitted with a housing. Two rolling bearings are installed on the outer surface of the rear end of the rotary joint. A mechanical seal moving ring is embedded in the annular groove of the inner wall of the rotary joint. A mechanical seal stationary ring is in contact with the rear side of the mechanical seal moving ring. A cooling water inlet is provided at the rear end of the housing. It has low rotational resistance, long service life, and is easy to replace.

Description

Technical Field

[0001] This utility model relates to a rotary joint assembly, belonging to the technical field of dust crusher. Background Technology

[0002] Metallurgical furnaces are typically equipped with waste heat boilers to collect flue gas. The collected flue gas is then transported to a target flue gas storage bin using a pneumatic conveying pump. During the conveying process, the particle size of the flue gas must be controlled below 15mm. In the metallurgical industry, crushers are generally used to achieve particle size control. The crusher rotor, during crushing, comes into contact with the flue gas at temperatures between 550℃ and 750℃. Prolonged operation can cause the crushing gears to deform and bend due to high temperatures, rendering them unable to rotate. To address the impact of high temperatures, the crushing gears generally employ a hollow structure, with a continuous flow of 0.45MPa cooling water to lower the temperature and maintain a relatively low level, preventing overheating and deformation that could lead to malfunctions during flue gas crushing. Since the crusher gears need to rotate continuously 360° during operation, while the cooling water supply pipe remains stationary, a rotary joint assembly is required to connect the cooling water pipe to the crushing gears. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a rotary joint assembly with low rotational resistance, long service life, and easy replacement.

[0004] The technical solution of this utility model is as follows:

[0005] A rotary joint assembly includes a rotary joint for internal threaded connection with crusher gears, a housing is fitted around the rotary joint, two rolling bearings are mounted on the outer surface of the rear end of the rotary joint, a mechanical seal moving ring is embedded in an annular groove in the inner wall of the rotary joint, a mechanical seal stationary ring is contacted and fitted on the rear side of the mechanical seal moving ring, and a cooling water inlet is provided at the rear end of the housing.

[0006] The rear end of the housing is threaded with an adjusting screw, and a compression spring is installed inside the rear end of the housing. The compression spring is located between the adjusting screw and the stationary ring of the mechanical seal, and the adjusting screw is used to adjust the compression of the compression spring.

[0007] Two rolling bearings are fixed to the inner wall of the housing by spring retainers, and the mechanical seal rotating ring is fixed by at least two locating pins.

[0008] The mechanical seal stationary ring has an annular oil reservoir on its back side. The annular oil reservoir is connected to the oil injection nozzle on the outer wall of the housing through an oblique lubrication channel. The oblique lubrication channel extends obliquely from the rear end of the housing toward the mechanical seal stationary ring.

[0009] The device also includes a rotary sealing ring and a stationary sealing ring. The rotary sealing ring is welded to the outer surface of the rotary joint, and the outer edge of the rotary sealing ring extends axially to form a first annular tooth. The stationary sealing ring is fixed to the inner wall of the housing, and the inner edge of the stationary sealing ring extends axially to form a second annular tooth. The first annular tooth and the second annular tooth are arranged in an alternating nested pattern in the axial direction. The rotary sealing ring and the stationary sealing ring are located at the rear end of the rolling bearing.

[0010] The positioning pin is a triangular prism structure. The first side of the positioning pin is interference-fitted with the positioning groove provided on the inner wall of the mechanical seal moving ring. The second side of the positioning pin is clearance-fitted with the guide slide rail provided on the inner wall of the rotary joint. The third side extends to form an anti-backlash hook, which is inserted into the limiting hole on the inner wall of the rotary joint.

[0011] The compression spring has washers at both ends.

[0012] This utility model has the following beneficial effects:

[0013] This utility model achieves high-pressure sealing and wear compensation adjustment of cooling water by using a mechanical seal dynamic ring, static ring and compression spring adjustment structure between the rotary joint and the housing, thus preventing cooling water leakage.

[0014] The staggered toothed fit between the rotating sealing ring and the stationary sealing ring prevents high-temperature dust from entering the bearing cavity; at the same time, the inclined lubrication channel and the inclined oil injection structure of the annular oil reservoir ensure continuous lubrication of the sealing surface, thus extending the service life of the mechanical seal.

[0015] The axial positioning of the rotary joint is achieved through the axial positioning cooperation of the double rolling bearings and the spring retainer, which achieves the effect of continuous gear hobbing without wear. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the positioning pin of this utility model.

[0018] The reference numerals in the figure are as follows:

[0019] 1. Rotary joint; 2. Housing; 3. Adjusting screw; 4. Compression spring; 5. Mechanical seal stationary ring; 6. Mechanical seal rotating ring; 7. Rolling bearing; 8. Locating pin; 9. Gasket; 10. Spring retainer; 11. Cooling water inlet; 21. Annular oil reservoir; 22. Angled lubrication channel; 24. Rotary sealing ring; 25. Stationary sealing ring; 81. Anti-reverse hook. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Please see Figures 1 to 2 The utility model provides a technical solution:

[0022] The rotary joint assembly of this embodiment includes a rotary joint 1 for internal threaded connection with the crusher's hobbing teeth. A housing 2 is fitted around the rotary joint 1. Two rolling bearings 7 are mounted on the outer surface of the rear end of the rotary joint 1. The two rolling bearings 7 are fixed to the inner wall of the housing 2 by spring retainers 10. A mechanical seal moving ring 6 is embedded in an annular groove in the inner wall of the rotary joint 1. The mechanical seal moving ring 6 is fixed by at least two locating pins 8. A mechanical seal stationary ring 5 is in contact with the rear side of the mechanical seal moving ring 6. A cooling water inlet 11 is provided at the rear end of the housing 2. An adjusting screw 3 is threadedly connected to the rear end port of the housing 2. The interior of the rear end of the housing 2... A compression spring 4 is provided, located between the adjusting screw 3 and the stationary ring 5 of the mechanical seal. The stationary ring 5 of the mechanical seal is tightly bonded to the rotating ring 6 of the mechanical seal by the preload of the compression spring 4 to prevent cooling water leakage. The adjusting screw 3 is used to adjust the compression of the compression spring 4. By adjusting the compression of the compression spring 4, the contact and fit between the stationary ring 5 and the rotating ring 6 of the mechanical seal can be made tighter. That is, both ends of the compression spring 4 are provided with gaskets 9. Preferably, the compression of the compression spring 4 can be adjusted by unscrewing or screwing in the adjusting screw 3 to make the fit between the stationary ring 5 and the rotating ring 6 of the mechanical seal tighter.

[0023] When the mechanical seal rotating ring 6 is severely worn and cooling water leaks out, the adjusting screw 3, the pressure spring 4, the mechanical seal rotating ring 6, and the mechanical seal stationary ring 5 can be removed in sequence and replaced with a new mechanical seal rotating ring 6 to continue use.

[0024] An annular oil reservoir 21 is provided on the back side of the mechanical seal stationary ring 5. The annular oil reservoir 21 is connected to the oil injection nozzle on the outer wall of the housing 2 through an inclined lubrication channel 22. The inclined lubrication channel 22 extends obliquely from the rear end of the housing 2 toward the mechanical seal stationary ring 5.

[0025] It also includes a rotating sealing ring 24 and a stationary sealing ring 25. The rotating sealing ring 24 is welded to the outer surface of the rotating joint 1 and rotates continuously and synchronously with the rotating joint 1. The outer edge of the rotating sealing ring 24 extends axially to form a first annular protrusion. The stationary sealing ring 25 is fixed to the inner wall of the housing 2. The housing 2 is rigidly connected to the external cooling water pipeline to remain stationary. The inner edge of the stationary sealing ring 25 extends axially to form a second annular protrusion. The first and second annular protrusions are arranged in an alternating nested pattern in the axial direction to form a tortuous channel. The rotating sealing ring 24 and the stationary sealing ring 25 are located at the rear end of the rolling bearing 7. The tortuous channel formed is used to block the smoke and dust that enters from the front working chamber. The alternating first and second annular protrusions force the smoke and dust to undergo multiple turns before passing through, effectively blocking external dust from the rolling bearing 7 and solving the problem of the rolling bearing 7 jamming due to the high temperature and dusty working conditions of the crusher. At the same time, the non-contact seal does not require lubrication, and the stationary sealing ring 25 can be separated by simply removing the bolts that fix it during disassembly and assembly, which is convenient and quick.

[0026] The locating pin 8 has a triangular prism structure. The first side of the locating pin 8 is interference-fitted with the locating groove provided on the inner wall of the mechanical seal dynamic ring 6 to achieve radial fixation. The second side of the locating pin 8 is clearance-fitted with the guide slide rail provided on the inner wall of the rotary joint 1, and can slide along the guide slide rail on the inner wall of the rotary joint 1 to ensure the axial installation alignment accuracy of the pin body. The third side extends to form an anti-reverse hook 81, which is inserted into the limiting hole on the inner wall of the rotary joint 1 to form an axial mechanical lock.

[0027] Preferably, the locating pin 8 is arranged at a 30° angle to the axis of the rotary joint 1, and the anti-reverse hook 81 is located at the front 1 / 3 of the inner wall of the rotary joint 1, that is, close to the crusher hobbing tooth connection end; the guide slide is an arc-shaped groove that extends 120° circumferentially along the inner wall of the rotary joint 1 and matches the curved surface of the second side; so as to achieve radial interference fit, axial limit and circumferential triple constraint, completely solving the problem of locating pin 8 loosening caused by high frequency vibration; at the same time, the anti-reverse hook 81 is deformed by the squeezing of the inner wall of the rotary joint 1 during the insertion process, and automatically pops up and locks after reaching the limit hole, without the need for additional fasteners, meeting the requirement of convenient replacement;

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A rotary union assembly, characterized by: The rotary joint (1) is used for internal thread connection with the crusher gear. The rotary joint (1) is fitted with a housing (2). Two rolling bearings (7) are installed on the outer surface of the rear end of the rotary joint (1). A mechanical seal moving ring (6) is embedded in the annular groove of the inner wall of the rotary joint (1). A mechanical seal stationary ring (5) is in contact with the rear side of the mechanical seal moving ring (6). A cooling water inlet (11) is opened at the rear end of the housing (2).

2. A rotary joint assembly as claimed in claim 1, characterized in that: The rear end port of the housing (2) is threaded with an adjusting screw (3), and a compression spring (4) is provided inside the rear end of the housing (2). The compression spring (4) is located between the adjusting screw (3) and the mechanical seal stationary ring (5). The adjusting screw (3) is used to adjust the compression amount of the compression spring (4).

3. A rotary union assembly as claimed in claim 1, wherein: Two rolling bearings (7) are fixed to the inner wall of the housing (2) by spring retainers (10), and the mechanical seal rotating ring (6) is fixed by at least two locating pins (8).

4. A rotary union assembly as claimed in claim 1, wherein: The mechanical seal stationary ring (5) is provided with an annular oil reservoir (21) on its back side. The annular oil reservoir (21) is connected to the oil injection nozzle on the outer wall of the housing (2) through an inclined lubrication channel (22). The inclined lubrication channel (22) extends obliquely from the rear end of the housing (2) toward the mechanical seal stationary ring (5).

5. A rotary union assembly as claimed in claim 1, wherein: It also includes a rotating sealing ring (24) and a stationary sealing ring (25). The rotating sealing ring (24) is welded to the outer surface of the rotary joint (1), and the outer edge of the rotating sealing ring (24) extends axially to form a first annular tooth. The stationary sealing ring (25) is fixed to the inner wall of the housing (2), and the inner edge of the stationary sealing ring (25) extends axially to form a second annular tooth. The first annular tooth and the second annular tooth are arranged in an alternating nested arrangement in the axial direction. The rotating sealing ring (24) and the stationary sealing ring (25) are located at the rear end of the rolling bearing (7).

6. A rotary union assembly as claimed in claim 3, wherein: The positioning pin (8) is a triangular prism structure. The first side of the positioning pin (8) is interference-fitted with the positioning groove provided on the inner wall of the mechanical seal moving ring (6). The second side of the positioning pin (8) is clearance-fitted with the guide slide rail provided on the inner wall of the rotary joint (1). The third side extends to form an anti-reverse hook (81). The anti-reverse hook (81) is inserted into the limiting hole on the inner wall of the rotary joint (1).

7. A rotary union assembly as claimed in claim 2, wherein: Both ends of the compression spring (4) are provided with washers (9).

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