Pumping unit motor speed detection device

Abstract

The pumping unit motor speed detection device is composed of a proximity switch (5), a proximity switch mounting support (6), a ratchet disc (7), a motor shaft (8), a nut (9), a flat washer (10), and a spring washer (11). The proximity switch mounting support (6) is fixed at the tail of the motor housing, and the hole for installing the proximity switch (5) is opposite to the ratchet disc (7) and matches the sensing distance and installation size of the proximity switch (5). The ratchet disc (7) is installed on the motor shaft (8), and the nut (9), the flat washer (10), and the spring washer (11) are installed at the tail of the motor shaft (8). The ratchet disc (7) rotates synchronously with the motor shaft (8), and the proximity switch (5) has a gap of 1-15 mm with the ratchet disc (7) and is always in a static state, greatly prolonging the service life and detection accuracy of the proximity switch (5).

Description

Technical Field

[0001] This utility model relates to a pumping unit motor speed detection device, belonging to the category of oil and gas extraction machinery. Background Technology

[0002] With the development of digital technology in oilfields and the increasing demand for precise adjustment and control of pumping unit operation, there is a need for accurate detection of motor operating speed. Currently, the conventional solution is to install a rotary encoder at the tail of the motor shaft, such as... Figure 1 As shown, the motor shaft (1) and the rotary encoder (4) are connected by a coupling (3), and the support for mounting the rotary encoder is fixed on the motor housing. When the motor is running, the motor shaft and the rotary encoder operate synchronously. The motor speed data is obtained by reading the rotary encoder signal. The data is accurate, but there are the following problems: (1) The coaxiality requirement between the motor shaft (1) and the rotary encoder (4) shaft is very high, and it is difficult to achieve complete coaxiality. The motor generally operates at high speed, and the coupling has revolution, which can easily be torn and broken. At the same time, it will also affect the operation of the rotary encoder (4) shaft, which will lead to the damage of the internal components of the rotary encoder (4); (2) The coupling is generally made of non-metallic material, and the oil pumping unit is an outdoor equipment that needs to be affected by factors such as day and night temperature difference, winter and summer temperature difference, and ultraviolet radiation. Its lifespan will also be affected by the weather. Based on the above reasons, in the current case of using the rotary encoder (4) scheme, the average effective lifespan of the motor speed detection system is less than 1 year, and some are even less than 3 months. This not only affects the operation of the oil pumping unit, but also increases the maintenance cost of the oil pumping unit. Summary of the Invention

[0003] The purpose of this invention is to provide a device for detecting the speed of an oil pumping unit motor.

[0004] This utility model is implemented as follows: it consists of a proximity switch (5), a proximity switch mounting bracket (6), a toothed disc (7), a motor shaft (8), a nut (9), a flat washer (10), and a spring washer (11). The assembly relationship is as follows: the proximity switch mounting bracket (6) is fixed to the tail of the motor housing, the hole for mounting the proximity switch (5) is aligned with the toothed disc (7), and the distance between the proximity switch (5) and the toothed disc (7) matches the sensing distance and installation dimensions of the proximity switch (5). The toothed disc (7) is mounted on the motor shaft (8), and the nut (9), flat washer (10), and spring washer (11) are mounted on the tail of the motor shaft (8). The toothed disc (7) rotates synchronously with the motor shaft (8), and there is a gap of 1-15mm between the proximity switch (5) and the toothed disc (7). The toothed disc (7) is made of metal, has more than 3 teeth that are evenly distributed, and the proximity switch (5) is inductive, photoelectric, or Hall effect.

[0005] The beneficial effects of this utility model are that the proximity switch (5) does not contact the motor shaft (8) and the toothed plate (7). When the motor shaft (8) rotates, the proximity switch (5) is stationary. The motor shaft (8) and the toothed plate (7) rotate synchronously. There is a gap of 1-15mm between the proximity switch (5) and the toothed plate (7). Every time the motor rotates, the proximity switch (5) detects the pulse signal corresponding to the number of teeth of the toothed plate (7). Since the proximity switch (5) is always stationary, the life of the motor speed detection system is greatly extended. At the same time, the proximity switch (5) is cheaper than the rotary encoder (4), and the overall cost will be greatly reduced. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of a conventional device for detecting the motor speed of an oil pumping unit. Figure 2 This is a schematic diagram of the oil pumping unit motor speed detection device involved in this utility model. Figure 3 This is a schematic diagram of the toothed disc structure. The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0007] like Figure 2 , 3 As shown, the pumping unit motor speed detection device consists of a proximity switch (5), a proximity switch mounting bracket (6), a toothed disc (7), a motor shaft (8), a nut (9), a flat washer (10), and a spring washer (11). The assembly relationship is as follows: the proximity switch mounting bracket (6) is fixed to the rear of the motor housing; the hole for mounting the proximity switch (5) is aligned with the toothed disc (7); the distance between the proximity switch (5) and the toothed disc (7) matches the sensing distance and installation dimensions of the proximity switch (5); the toothed disc (7) is mounted on the motor shaft (8); the nut (9), flat washer (10), and spring washer (11) are mounted at the rear of the motor shaft (8); the toothed disc (7) rotates synchronously with the motor shaft (8); and there is a 1-15mm gap between the proximity switch (5) and the toothed disc (7). The toothed disc (7) is made of metal, has more than 3 teeth that are evenly distributed, and the proximity switch (5) is inductive, photoelectric, or Hall effect. Figure 3 The diaphragm shown is a 6-tooth diaphragm, which is only a special case. Depending on the accuracy requirements of the test, the number of teeth can be more than 3, and the maximum number of teeth is no more than 48.

[0008] As described above, the embodiments of this utility model have been described in detail. The embodiments described in this utility model are only one of the preferred embodiments. For those skilled in the art, several improvements, modifications or variations can be made without departing from the principle of this invention. These improvements, modifications or variations are also considered to be within the protection scope of this utility model.

Claims

1. A pumping unit motor speed detection device, characterized in that: It consists of a proximity switch (5), a proximity switch mounting bracket (6), a toothed disc (7), a motor shaft (8), a nut (9), a flat washer (10), and a spring washer (11). Their assembly relationship is as follows: The proximity switch mounting bracket (6) is fixed to the rear of the motor housing. The hole for mounting the proximity switch (5) is aligned with the toothed plate (7). The distance between the proximity switch (5) and the toothed plate (7) matches the sensing distance and mounting dimensions of the proximity switch (5). The toothed plate (7) is mounted on the motor shaft (8). The nut (9), flat washer (10), and spring washer (11) are mounted on the rear of the motor shaft (8). The toothed plate (7) rotates synchronously with the motor shaft (8). There is a 1-15mm gap between the proximity switch (5) and the toothed plate (7).

2. The pumping unit motor speed detection device according to claim 1, characterized in that: The toothed disc (7) is made of metal with more than 3 teeth that are evenly distributed. The proximity switch (5) is inductive, photoelectric, or Hall effect.

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