Non-magnetic high-speed drive shaft assembly

Abstract

The present invention relates to the technical field of positive displacement motor tools, and particularly to a non-magnetic high-speed drive shaft assembly. It includes a drive shaft, a lower sealing joint, a lower TC outer sleeve, a limit sleeve, a positioning sleeve, a pressure-bearing sleeve, a spacer sleeve, a series of bearings, a water cap, an upper TC outer sleeve, a drive shaft housing, an upper sealing joint, a piston, a wear-resistant sleeve, and a universal shaft housing. The drive shaft and the surface of the water cap of this device are spray-welded with wear-resistant alloy and are matched with a beryllium bronze outer sleeve, and the upper housing is sealed with a piston. Thereby, the cost and processing difficulty are reduced, and the work efficiency and product quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of positive displacement motors, and particularly to a non-magnetic high-speed drive shaft assembly. Background Art

[0002] A positive displacement motor is a hydraulic machine, an energy conversion device that converts the pressure energy of a liquid into mechanical energy, also known as a positive displacement motor. It has the characteristics of high speed and large torque. It is one of the commonly used downhole tools in coal mine drilling engineering and is also the most widely used downhole power drill. The positive displacement motor mainly consists of a sub, a motor assembly, a universal shaft assembly, a drive shaft assembly, etc. Among them, the drive shaft assembly is one of the important components of the positive displacement motor. Its service life determines the overall service life of the positive displacement motor. The drive shaft assembly is mainly used to transmit speed and torque. When using a high-speed and high-power motor, due to the large output speed and torque, when the drive shaft is damaged, it will cause drilling operation accidents. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the technology and provide a non-magnetic high-speed drive shaft assembly.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A non-magnetic high-speed drive shaft assembly, characterized in that it includes a drive shaft, a lower seal joint, a lower TC outer sleeve, a limit sleeve, a positioning sleeve, a pressure-bearing sleeve, a spacer sleeve, a series bearing, a water cap, an upper TC outer sleeve, a drive shaft housing, an upper seal joint, a piston, a wear-resistant sleeve, and a universal shaft housing; the lower seal joint is threadedly connected to one end of the drive shaft housing, the lower seal joint is sleeved on the drive shaft, the lower TC outer sleeve is disposed between the drive shaft and the lower seal joint, the front end of the lower seal joint is in fit with the stepped platform on the lower TC outer sleeve, the limit sleeve is sleeved on the drive shaft, the positioning sleeve is located between the limit sleeve and the drive shaft housing, and both ends of the positioning sleeve are in contact fit with the lower TC outer sleeve and the spacer sleeve respectively, the pressure-bearing sleeve is located on one side of the limit sleeve and is sleeved on the drive shaft, the spacer sleeve is sleeved on the pressure-bearing sleeve, the series bearing is arranged between the drive shaft and the drive shaft housing, the series bearing is connected to one end of the water cap, the upper seal joint is threadedly connected to the other end of the drive shaft housing, the upper TC outer sleeve is sleeved on the water cap, the piston is sleeved on the water cap and is located inside the upper seal joint, the universal shaft housing is threadedly connected to the other end of the upper seal joint, and the wear-resistant sleeve is embedded in the universal shaft housing.

[0005] Preferably, the surface of the water cap is sprayed with wear-resistant alloy.

[0006] Preferably, the upper TC outer sleeve and the lower TC outer sleeve are respectively made of beryllium bronze material.

[0007] The beneficial effects of the present invention are as follows: Compared with the prior art, the transmission shaft of the present device is spray-welded with wear-resistant alloy on the surface of the water cap and is matched with a beryllium bronze outer sleeve, and the upper shell is sealed with a piston. Thereby, the cost and processing difficulty are reduced, and the work efficiency and product quality are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of the upper part structure of the present device;

[0009] Figure 2 is a schematic diagram of the lower part structure of the present device;

[0010] Figure 3 is an exploded view of the present device. DETAILED DESCRIPTION OF THE INVENTION

[0011] For the sake of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., can be used here to describe the spatial position relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "beneath" other devices or structures after inversion. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0012] As Figures 1-3 shown, a non-magnetic high-speed transmission shaft assembly includes a transmission shaft 1, a lower seal joint 2, a lower TC outer sleeve 3, a limit sleeve 4, a positioning sleeve 5, a pressure-bearing sleeve 6, a spacer sleeve 7, a series bearing 8, a water cap 9, an upper TC outer sleeve 10, a transmission shaft housing 11, an upper seal joint 12, a piston 3, a wear-resistant sleeve 14, and a universal shaft housing 15; the lower seal joint is threadedly connected to one end of the transmission shaft housing, the lower seal joint is sleeved on the transmission shaft, and a sealing ring is provided between the lower seal joint and the transmission shaft to seal the transmission shaft.

[0013] The lower TC outer sleeve 3 is disposed between the transmission shaft 1 and the lower seal joint 2, and the front end of the lower seal joint 2 is fitted with a stepped platform on the lower TC outer sleeve 3, that is, the lower seal joint is clamped at this position. The limit sleeve 4 is sleeved on the transmission shaft, and both ends of the limit sleeve are respectively clamped between the transmission shaft and the pressure-bearing sleeve.

[0014] The positioning sleeve 5 is located between the limiting sleeve 4 and the transmission shaft housing 11. The two ends of the positioning sleeve are respectively in contact and cooperation with the lower TC outer sleeve 3 and the spacer sleeve 7. The pressure-bearing sleeve 6 is located on one side of the limiting sleeve and sleeved on the transmission shaft. The two ends of the pressure-bearing sleeve are respectively in contact and cooperation with the limiting sleeve and the series bearing.

[0015] The spacer sleeve is sleeved on the pressure-forming sleeve. The series bearing is arranged on the transmission shaft and the transmission shaft housing bracket. The series bearing is connected to one end of the water cap. The upper sealing joint is threadedly connected to the other end of the transmission shaft housing. The upper TC outer sleeve is sleeved on the water cap. The piston is sleeved on the water cap and located inside the upper sealing joint. The universal shaft housing is threadedly connected to the other end of the upper sealing joint. The wear-resistant sleeve is embedded in the universal shaft housing. The surface of the water cap is sprayed with wear-resistant alloy. The upper TC outer sleeve and the lower TC outer sleeve are respectively made of beryllium bronze material. All materials are selected as non-magnetic materials. The lower sealing joint is provided with an oil injection hole and adopts oil seal to play a lubricating role.

[0016] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A non-magnetic high-speed drive shaft assembly, characterized in that: it includes a drive shaft, a lower seal joint, a lower TC outer sleeve, a limit sleeve, a positioning sleeve, a pressure-bearing sleeve, a spacer sleeve, a series bearing, a water cap, an upper TC outer sleeve, a drive shaft housing, an upper seal joint, a piston, a wear-resistant sleeve, and a universal shaft housing; the lower seal joint is threadedly connected to one end of the drive shaft housing, the lower seal joint is sleeved on the drive shaft, the lower TC outer sleeve is placed between the drive shaft and the lower seal joint, the front end of the lower seal joint is matched with the stepped platform on the lower TC outer sleeve, the limit sleeve is sleeved on the drive shaft, the positioning sleeve is located between the limit sleeve and the drive shaft housing, and both ends of the positioning sleeve are in contact and cooperation with the lower TC outer sleeve and the spacer sleeve respectively, the pressure-bearing sleeve is located on one side of the limit sleeve and is sleeved on the drive shaft, the spacer sleeve is sleeved on the pressure-bearing sleeve, the series bearing is arranged between the drive shaft and the drive shaft housing bracket, the series bearing is connected to one end of the water cap, the upper seal joint is threadedly connected to the other end of the drive shaft housing, the upper TC outer sleeve is sleeved on the water cap, the piston is sleeved on the water cap and is located inside the upper seal joint, the universal shaft housing is threadedly connected to the other end of the upper seal joint, and the wear-resistant sleeve is arranged between the water cap and the universal shaft housing.

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