A torque measurement device for a permanent magnet synchronous motor used in wells

Abstract

The present invention relates to a torque measuring device for a permanent magnet synchronous motor used in a well, which comprises a cylinder body, an upper support plate and a lower support plate arranged in the cylinder body, a torque measuring instrument arranged between the upper support plate and the lower support plate, and an upper cover and a lower cover arranged at the upper and lower opening positions of the cylinder body; the upper shaft of the torque measuring instrument passes through the upper support plate and the upper cover and is connected to the submersible pump shaft, and its lower shaft passes through the lower support plate and the lower cover and is connected to the shaft of the permanent magnet motor for the well; by installing the torque measuring instrument in a sealed cylindrical structure and connecting one end to the submersible pump shaft and the other end to the shaft of the permanent magnet motor for the well, the present invention can achieve a better sealing effect and realize the measurement of the torque of the permanent magnet synchronous motor underground.

Description

Technical Field

[0001] The present invention belongs to the field of submersible motor pumps for wells, and particularly relates to a torque measuring device for a permanent magnet synchronous motor for wells. Background Art

[0002] At present, most of the motors used in submersible motor pumps for wells are asynchronous submersible motors. Compared with asynchronous motors, permanent magnet synchronous motors have the advantage of high efficiency. In recent years, with the gradual in-depth research on permanent magnet synchronous motors, the application of permanent magnet synchronous motors has also been greatly promoted. However, the application of permanent magnet synchronous motors in the field of submersible motor pumps for wells is still in the experimental research stage. To conduct experimental research on submersible motor pumps for wells driven by permanent magnet synchronous motors, it is necessary to reliably and accurately measure the torque of the permanent magnet synchronous motor. However, the submersible motor pump for wells is in an underwater working environment, and there is currently no special device suitable for measuring the torque of the permanent magnet synchronous motor underwater. Therefore, it is very necessary to design a torque measuring device for a permanent magnet synchronous motor for wells. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a torque measuring device for a permanent magnet synchronous motor for wells, which can be used to measure the torque of the permanent magnet synchronous motor underground.

[0004] The technical solution adopted by the present invention is: a torque measuring device for a permanent magnet synchronous motor for wells, which includes a cylinder body, an upper support plate and a lower support plate arranged in the cylinder body, a torque measuring instrument arranged between the upper support plate and the lower support plate, and an upper cover and a lower cover arranged at the upper and lower openings of the cylinder body; the upper shaft of the torque measuring instrument passes through the upper support plate and the upper cover and is connected to the submersible pump shaft, and its lower shaft passes through the lower support plate and the lower cover and is connected to the shaft of the permanent magnet motor for wells.

[0005] Further, connection rings are installed above the upper cover and below the lower cover respectively for connecting with the connection sections of the submersible pump and the permanent magnet motor.

[0006] Further, steps are respectively arranged at the upper and lower positions of the inner wall of the cylinder body, and the upper support plate and the lower support plate are positioned by the steps and fixedly connected in the cylinder body by a bolt-nut group.

[0007] Further, the upper cover and the lower cover are connected by a bolt-nut group.

[0008] Further, a water throwing ring is installed on the upper shaft of the torque measuring instrument between the upper support plate and the upper cover. A central hole is arranged on the upper support plate, the upper shaft passes through the central hole, and a protruding step is arranged at the position of the central hole.

[0009] Further, drain holes are arranged at the peripheries of the upper support plate and the lower support plate.

[0010] Further, a water storage tank is provided on the upper surface of the lower cover, a water discharge hole is provided at the bottom of the water storage tank, and a water discharge bolt is provided in the water discharge hole.

[0011] Further, an O-ring seal is provided at the connection between the upper cover, the lower cover and the cylinder body.

[0012] Further, the part where the torque measuring instrument passes through the upper cover and the lower cover adopts a mechanical seal combination;

[0013] There are rabbets for installing the static ring of the mechanical seal on the upper surface of the upper cover and the lower surface of the lower cover. The static ring of the mechanical seal is installed on the upper surface of the upper cover and the lower surface of the lower cover. The dynamic ring of the mechanical seal is sleeved on the upper and lower shafts of the torque measuring instrument and is located outside the static ring of the mechanical seal. The static ring and the dynamic ring of the mechanical seal together form a sealing surface.

[0014] The positive effects of the present invention are as follows:

[0015] By installing the torque measuring instrument in a closed cylindrical structure, connecting one end to the submersible pump shaft and the other end to the shaft of the permanent magnet motor for well use, the present invention can achieve a better sealing effect and realize the measurement of the torque of the permanent magnet synchronous motor underground.

[0016] At the same time, corresponding sealing structures are also provided at the connection positions of the entire device, and the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a sectional view of the present invention;

[0019] Figure 3 is a schematic structural diagram of the upper support plate of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] As shown in the Figures 1-3 accompanying drawings, the present invention includes a cylinder body 1, an upper cover 2, a lower cover 3, a torque measuring instrument 4, an upper support plate 5, a lower support plate 6, a static ring 7 of the mechanical seal, a dynamic ring 8 of the mechanical seal, a water throwing ring 9, a positioning pin 10, an O-ring seal 11 and a bolt and nut set 12.

[0021] The upper part of the upper cover 2 is a disc-shaped connecting ring, which is provided with a positioning rabbet and bolt holes. The connecting ring is connected to the connecting section of the submersible pump and is positioned by the rabbet and connected by bolts. The upper shaft of the torque measuring instrument 4 is connected to the submersible pump shaft by a spline. The lower part of the lower cover 3 is a disc-shaped connecting ring, which is provided with a positioning collar and connecting holes. The connecting ring is connected to the connecting section on the permanent magnet motor and is positioned by the positioning collar and connected by bolts. The lower shaft of the torque measuring instrument is connected to the shaft of the permanent magnet motor for wells by a spline. Six bolt holes are evenly distributed on the outer circle parts of the upper cover 2 and the lower cover 3. After the upper cover 2 and the lower cover 3 are covered on the cylinder body 1, they are connected by a bolt and nut set 12, so that the cylinder body 1, the upper cover 2 and the lower cover 3 are connected together.

[0022] Steps are provided at two positions, upper and lower, on the inner wall of the cylinder body 1 for positioning the upper support plate 5 and the lower support plate 6. The outer circle parts of the upper support plate 5 and the lower support plate 6 both have positioning rabbets. The upper support plate 5 and the lower support plate 6 are positioned by the steps on the inner wall of the cylinder body 1 and are connected by a bolt and nut set 12 and fixed inside the cylinder body 1.

[0023] The torque measuring instrument 4 is arranged between the upper and lower support plates. The lower surface of the upper support plate ⑤ and the upper surface of the lower support plate 6 have rabbets for positioning the torque measuring instrument 4, and there are positioning holes in the rabbets. The torque measurement is positioned by a positioning pin 10, and the torque measuring instrument 4 is fixed inside the cylinder body 1 by the upper support plate 5 and the lower support plate 6.

[0024] The upper support plate 5, the upper cover 2, the lower support plate 6, and the lower cover 3 are all provided with holes for the connecting shaft of the torque measuring instrument to pass through.

[0025] The part of the torque measuring instrument 4 passing through the upper cover 2 and the lower cover 3 adopts a mechanical seal combination. There are rabbets for installing the static mechanical seal ring 7 on the upper surface of the upper cover 2 and the lower surface of the lower cover 3. The static mechanical seal ring 7 is installed on the upper surface of the upper cover 2 and the lower surface of the lower cover 3. The dynamic mechanical seal ring 8 is sleeved on the upper and lower shafts of the torque measuring instrument. The static mechanical seal ring 7 and the dynamic mechanical seal ring 8 together form a sealing surface to prevent water from entering the torque measuring device through the shaft part of the torque measuring instrument and damaging the torque measuring instrument. At the same time, a water throwing ring 9 is sleeved on the upper shaft of the torque measuring instrument. The water throwing ring 9 is located between the upper cover 2 and the upper support plate 5. Once the mechanical seal leaks and a small amount of water flows into the torque measuring device along the upper shaft of the torque measuring instrument, the rotating water throwing ring 9 will throw the water to the periphery and fall on the outer periphery of the upper surface of the upper support plate 5. There is a protruding step at the center hole part of the upper support plate 5, and the water thrown onto the upper surface of the upper support plate will not flow along the center hole of the upper support plate 5 to the torque measuring instrument. There are drain holes 16 on the periphery of the upper support plate 5, and the water on it will flow through the drain holes to the upper surface of the lower support plate 6. At the same time, there are also drain holes on the periphery of the lower support plate 6 to drain the water to the upper surface of the lower cover 3. There is a water storage tank on the upper surface of the lower cover 3, and there are a drain hole and a drain bolt at the bottom of the tank. After the torque measurement is completed and the device is lifted above the water surface, turn open the drain bolt to drain the water in the water storage tank.

[0026] There is a ring groove for placing the O-ring 11 on the upper surface of the cylinder body 1. Place the O-ring in the ring groove on the upper surface and play a sealing role through the pressing of the upper cover 2. There is also a ring groove for placing the O-ring 11 on the upper surface of the lower cover 3. Place the O-ring in the ring groove and play a sealing role through the pressing of the cylinder body 1.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torque measuring device for a permanent magnet synchronous motor used in a well, characterized in that It includes a cylinder body (1), an upper support plate (5) and a lower support plate (6) arranged inside the cylinder body (1), a torque measuring instrument (4) arranged between the upper support plate (5) and the lower support plate (6), and an upper cover (2) and a lower cover (3) arranged at the upper and lower openings of the cylinder body (1); the upper shaft of the torque measuring instrument (4) passes through the upper support plate (5) and the upper cover (2) and then is connected to the submersible pump shaft, and its lower shaft passes through the lower support plate (6) and the lower cover (3) and then is connected to the shaft of the permanent magnet motor for wells; A water throwing ring (9) is installed on the upper shaft of the torque measuring instrument (4) between the upper support plate (5) and the upper cover (2). A central hole is provided on the upper support plate (5), the upper shaft passes through the central hole, and a protruding step is provided at the position of the central hole; Drainage holes (16) are provided on the peripheries of the upper support plate (5) and the lower support plate (6); A water storage tank (14) is provided on the upper surface of the lower cover (3). A water discharge hole is provided at the bottom of the water storage tank (14), and a water discharge bolt (15) is provided in the water discharge hole; The parts of the torque measuring instrument passing through the upper cover (2) and the lower cover (3) adopt a mechanical seal combination; Steps are respectively provided at the upper and lower positions on the inner wall of the cylinder body (1). The upper support plate (5) and the lower support plate (6) are positioned by the steps and are fixedly connected inside the cylinder body (1) by a bolt and nut group (12); The upper surface of the upper cover (2) and the lower surface of the lower cover (3) both have shoulders for installing the mechanical seal stationary ring (7). The mechanical seal stationary ring (7) is installed on the upper surface of the upper cover (2) and the lower surface of the lower cover (3). The mechanical seal dynamic ring (8) is sleeved on the upper and lower shafts of the torque measuring instrument and is located outside the mechanical seal stationary ring (7). The mechanical seal stationary ring (7) and the mechanical seal dynamic ring (8) jointly form a sealing surface.

2. The torque measuring device for a permanent magnet synchronous motor for well use according to claim 1, characterized in that, Connection rings are installed above the upper cover (2) and below the lower cover (3) respectively for connecting with the connecting sections of the submersible pump and the permanent magnet motor.

3. The torque measuring device for a permanent magnet synchronous motor for well use according to claim 1, characterized in that The upper cover (2) and the lower cover (3) are connected by a bolt and nut group (12); 4. A torque measuring device for a permanent magnet synchronous motor for well use according to claim 1, characterized in that An O-ring (11) is provided at the connection between the upper cover (2), the lower cover (3) and the cylinder body (1).

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