A neck lengthened anti-fouling central swivel joint

Abstract

The utility model discloses a neck lengthened anti-fouling central rotary joint, including the rotary shaft, the rotary body of being sleeved on it, the end cover being connected in the rotary body one end and being located between the baffle of end cover and rotary shaft. The rotary shaft is the ladder shaft with first, second and third ladder. The rotary body is sleeved on the first ladder, and its outer diameter is adapted to the second ladder outer diameter. The flange is sleeved on the second ladder, and the second ladder axial length is greater than the flange thickness, so that the rotary body end surface and the ladder end surface (first shaft shoulder) between the first and second ladder are flush. The ladder end surface and the rotary body end surface are equipped with the first sealing washer, and the end surface preferably is equipped with the chamfer. This "neck lengthened" design eliminates the step fouling area between the rotary body and the flange in the traditional structure, and cooperates the end surface sealing washer and the chamfer structure, effectively prevents the oil dirt, dust accumulation from eroding the sealing element, improves the sealing reliability and the joint service life.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, specifically to a central rotary joint with an extended neck for preventing contamination. Background Technology

[0002] Traditional central rotary joints typically have a simple stepped structure for their rotary shaft, such as... Figure 1 As shown, both the rotating body and the flange are fitted onto the first step of the rotating shaft. At this point, the flange diameter is larger than the rotating body diameter, so a step area is formed between the flange and the end face of the rotating body. This area is exposed to the outside environment for a long time during operation, so it is easy for oil, dust and rainwater to accumulate, which will corrode the sealing ring over a long period of time, leading to sealing failure and oil leakage, which greatly reduces the service life of the central rotary joint. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the existing technology and provide a central rotary joint with an extended neck for preventing contamination.

[0004] To achieve the above objectives, the technical solution of this utility model is to design a neck-extended, anti-fouling central rotary joint, including a rotary shaft, a rotary body, an end cap, and a baffle. The rotary body is fitted onto the rotary shaft. The end cap is connected to the end of the rotary body away from the rotary shaft. A baffle is provided between the end cap and one end of the rotary shaft. The baffle is connected to one end of the rotary shaft by fasteners. The diameter of the baffle is larger than the diameter of one end of the rotary shaft. The rotary shaft has multiple oil inlets along its axial direction. One end of each oil inlet... The rotating body is equipped with an oil inlet. Multiple oil outlet channels are arranged circumferentially on the inner wall of the rotating body, each communicating with a different oil inlet channel. Each oil outlet channel has an oil outlet at its end furthest from the inlet channel. The rotating shaft is a stepped shaft with three steps: a first step, a second step, and a third step. The rotating body is fitted onto the first step of the rotating shaft, and the outer diameter of the rotating body is compatible with the outer diameter of the second step. A flange is fitted onto the second step, and the axial length of the second step is greater than the thickness of the flange. An extended neck design makes the first shoulder flush with the end face of the rotating body, eliminating the accumulation area of ​​dirt in traditional structures and preventing oil adhesion.

[0005] The stepped end faces of the first and second steps of the rotating shaft are the first shoulders, and a first sealing ring is provided between the first shoulder and the end face of the rotating body. The first sealing ring is preferably a hydrogenated nitrile rubber sealing ring. The sealing ring can ensure the sealing of the contact surface between the rotating body and the rotating shaft, preventing internal liquid leakage and external liquid intrusion.

[0006] The first shoulder is chamfered. The chamfer is preferably rounded, which can prevent dust from accumulating at the joint and has a better effect on preventing oil stains from accumulating.

[0007] The rotating body has multiple first annular grooves on its inner wall, which are spaced apart from multiple oil outlets. Each first annular groove contains an oil seal. The oil seal effectively isolates adjacent annular oil outlets, preventing oil leakage.

[0008] The inner walls at both ends of the rotating body are provided with second annular grooves, and shaft seals are installed in the second annular grooves. The shaft seals are preferably made of fluororubber, and the shaft seals can ensure that no liquid leakage occurs when the rotating body and the rotating shaft rotate relative to each other.

[0009] An O-ring is provided on the inner wall of the rotating body near the oil inlet, and an O-ring is provided in the O-ring. The O-ring is preferably a fluororubber O-ring. The O-ring can ensure the sealing of the contact surface between the rotating body and the rotating shaft, preventing internal liquid leakage and external liquid intrusion.

[0010] The end cap, baffle, and rotating body contact surfaces are provided with a second sealing ring. The second sealing ring is preferably a hydrogenated nitrile rubber sealing ring. The sealing ring can ensure the sealing of the contact surface between the rotating body and the rotating shaft, preventing internal liquid leakage and external liquid intrusion.

[0011] The advantages and beneficial effects of this utility model are as follows: the neck lengthening design makes the first shoulder flush with the end face of the rotating body, eliminating the dirt accumulation area of ​​the traditional structure, and the chamfer design of the first shoulder further prevents oil stains from adhering. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the central rotary joint structure in the background technology;

[0013] Figure 2 This is a schematic diagram of the central rotary joint structure of this utility model;

[0014] Figure 3 This is a cross-sectional view of the central rotary joint of this utility model.

[0015] In the diagram: 1. Rotary shaft; 100. Oil inlet passage; 101. Oil inlet port; 2. Rotary body; 200. Oil outlet passage; 210. Oil outlet port; 211. First step; 212. Second step; 213. Third step; 214. First shoulder; 220. First annular groove; 221. Oil seal; 230. Second annular groove; 231. Shaft seal; 240. O-ring groove; 241. O-ring; 3. End cover; 4. Baffle; 5. Flange; 6. First sealing ring; 7. Second sealing ring. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0017] according to Figure 2 , 3 As shown, this utility model is a neck-extended anti-fouling central rotary joint, including a rotary shaft 1, a rotary body 2, an end cap 3, and a baffle 4. The rotary body 2 is fitted onto the rotary shaft 1. The end cap 3 is connected to the end of the rotary body 2 away from the rotary shaft 1. A baffle 4 is provided between the end cap 3 and one end of the rotary shaft 1. The baffle 4 is connected to one end of the rotary shaft 1 by fasteners. The diameter of the baffle 4 is larger than the diameter of one end of the rotary shaft 1. The rotary shaft 1 has multiple oil inlet channels 100 along its axial direction. One end of each oil inlet channel 100 is connected to an oil inlet port 101. The inner wall of the rotary body 2 has... Multiple oil outlet channels 200 are provided along the circumferential direction. The multiple oil outlet channels 200 are respectively connected to multiple oil inlet channels 100. The ends of the multiple oil outlet channels 200 away from the oil inlet channels 100 are connected to oil outlets 210. The rotary shaft 1 is a stepped shaft, which consists of a first step 211, a second step 212 and a third step 213. The rotary body 2 is fitted on the first step 211 of the rotary shaft 1. The outer diameter of the rotary body 2 is adapted to the outer diameter of the second step 212. A flange 5 is fitted on the second step 212. The axial length of the second step 212 is greater than the thickness of the flange 5.

[0018] The stepped end faces of the first step 211 and the second step 212 of the rotary shaft 1 are the first shoulder 214, and a first sealing ring 6 is provided between the first shoulder 214 and the end face of the rotary body 2.

[0019] The first shoulder 214 is chamfered.

[0020] The inner wall of the rotating body 2 is provided with a plurality of first annular grooves 220, and the plurality of first annular grooves 220 are spaced apart from a plurality of oil outlets 200. An oil seal 221 is provided in the first annular groove 220.

[0021] The inner wall of one end of the rotating body 2 is provided with a second annular groove 230, and a shaft seal 231 is provided in the second annular groove 230.

[0022] An O-shaped groove 240 is provided on the inner wall of the rotating body 2 near the oil inlet 101, and an O-ring 241 is provided in the O-shaped groove 240.

[0023] The end cap 3, baffle 4 and rotating body 2 are provided with a second sealing ring 7 on their contact surfaces.

[0024] Based on the traditional central rotary joint, this utility model designs the rotary shaft 1 as a stepped shaft, consisting of a first step 211, a second step 212, and a third step 213. The rotary body 2 is mounted on the first step 211 of the rotary shaft 1. The outer diameter of the rotary body 2 is adapted to the outer diameter of the second step 212. A flange 5 is mounted on the second step 212, and the axial length of the second step 212 is greater than the axial length of the flange 5. In this way, the outer end face of the rotating body 2 is flush with the first shoulder 214 of the rotating shaft 1, and a section of the shaft is still exposed on the outer side of the flange 5 mounting position on the second step 212. Oil stains will mainly accumulate in the area between the flange 5 and the exposed second step 212 shaft section, thus avoiding the accumulation of oil stains in the critical sealing area between the end face of the rotating body 2 and the first shoulder 214 of the rotating shaft 1. That is, it avoids the accumulation of oil stains in the critical first shoulder 214 and the joint formed with the end face of the rotating body 2. Therefore, it can prevent oil stains or dust from corroding the sealing ring at the contact point between the rotating body 2 and the rotating shaft 1. In addition, the first shoulder 214 is designed with a chamfer, which can also prevent the accumulation of oil stains or dust.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A central rotary joint with an extended neck for preventing contamination, comprising a rotary shaft (1), a rotary body (2), an end cap (3), and a baffle (4), wherein the rotary body (2) is fitted onto the rotary shaft (1), the end cap (3) is connected to the end of the rotary body (2) away from the rotary shaft (1), and a baffle (4) is provided between the end cap (3) and one end of the rotary shaft (1), the baffle (4) being connected to one end of the rotary shaft (1) by fasteners, and the diameter of the baffle (4) being larger than that of the rotary shaft (1). 1) One end diameter, the rotating shaft (1) is provided with a plurality of oil inlet channels (100) along the axial direction, one end of each oil inlet channel (100) is respectively connected to an oil inlet port (101), the inner wall of the rotating body (2) is provided with a plurality of oil outlet channels (200) along the circumferential direction, the plurality of oil outlet channels (200) are respectively connected to the plurality of oil inlet channels (100), and the ends of the plurality of oil outlet channels (200) away from the oil inlet channels (100) are connected to an oil outlet port (210), characterized in that, The rotating shaft (1) is a stepped shaft, consisting of a first step (211), a second step (212), and a third step (213). The rotating body (2) is fitted onto the first step (211) of the rotating shaft (1). The outer diameter of the rotating body (2) is adapted to the outer diameter of the second step (212). A flange (5) is fitted onto the second step (212). The axial length of the second step (212) is greater than the thickness of the flange (5).

2. A neck lengthened anti-fouling central swivel according to claim 1, characterized in that The first step (211) and the second step (212) of the rotary shaft (1) have a first shoulder (214) at their stepped end faces, and a first sealing ring (6) is provided between the first shoulder (214) and the end face of the rotary body (2).

3. A neck lengthened anti-fouling central swivel according to claim 2, characterised in that, The first shoulder (214) is chamfered.

4. A neck lengthened anti-fouling central swivel according to claim 1, characterized in that The inner wall of the rotating body (2) is provided with a plurality of first annular grooves (220), and the plurality of first annular grooves (220) are spaced apart from a plurality of oil outlets (200). An oil seal (221) is provided in the first annular groove (220).

5. A neck lengthened anti-fouling central swivel according to claim 1, characterized in that The rotating body (2) has a second annular groove (230) on the inner wall of one end, and a shaft seal (231) is provided in the second annular groove (230).

6. A neck-extended anti-fouling central rotary joint according to claim 2, characterized in that, An O-shaped groove (240) is provided on the inner wall of the rotating body (2) near the oil inlet (101), and an O-ring (241) is provided in the O-shaped groove (240).

7. A neck lengthened anti-fouling central swivel according to claim 1, characterized in that The end cap (3), baffle (4) and rotating body (2) are provided with a second sealing ring (7).

Images