CN204007750U - Photoelectromagnetic coupling rotary-piston type flowmeters - Google Patents

Abstract

The utility model discloses an opto-electromagnetic coupling rotary piston flowmeter, which solves the problems of low precision and low reliability of the existing rotary piston flowmeter. The upper end of the metering chamber is provided with a support cover, and the lower end of the lower magnet is fixedly connected with a driving rod that runs through the supporting cover, and the lower end of the driving rod is connected to the top of the rotary piston by transmission; the supporting cover is provided with a cover that covers the upper magnet and the lower magnet. , between the upper magnet and the lower magnet, there is a sealing partition that is sealingly matched with the circulation main body; the upper magnet is coupled with the lower magnet and is located directly above the lower magnet, and the gland is equipped with a shaft fixedly connected with the upper magnet through a bearing. The upper end protrudes from the top surface of the gland, the photoelectric code disc is sleeved on the upper end of the rotating shaft, and the photoelectric sensor corresponds to the position of the photoelectric code disc. The opto-electromagnetic coupling rotary piston flowmeter of the utility model improves the accuracy and reliability and reduces the failure rate through the cooperation of the upper magnet, the lower magnet, the gland, the photoelectric code disc and the photoelectric sensor.

Description

Optical Electromagnetic Coupled Rotary Piston Flowmeter

technical field

The utility model relates to a liquid flowmeter device, in particular to a photoelectromagnetic coupling rotary piston flowmeter with high precision, high reliability and low failure rate.

Background technique

The rotary piston flowmeter is a kind of positive displacement flowmeter. Its rotor is a container with a fixed volume. It discharges a fixed volume of fluid every time it rotates. Therefore, the flow rate per unit time of the rotary piston flowmeter can be calculated accordingly. Or traffic within a certain period of time. Rotary piston flowmeters are small in size, low in cost, and high in measurement accuracy, and are widely used in petroleum, chemical, coating, pharmaceutical, food and other industrial sectors. In addition to the mechanical part, the rotary piston flowmeter must also have a counting unit and a signal processing unit in order to connect with the controller (PLC, single-chip microcomputer, etc.). The Hall sensor is small in size, low in cost, and high in sensitivity. The rotary piston flowmeter The counting unit generally adopts Hall sensor. This type of flowmeter generally places a ring magnet on the rotor of the flowmeter, and six unipolar Hall sensors correspond to the ring magnet. When the rotor rotates, the Hall element responds to the changing magnetic field and generates a pulse signal. The pulse signal is output to the controller after being filtered, amplified and shaped. However, the signal processing circuit of the Hall effect rotary piston flowmeter is relatively complex, the output waveform is not ideal, and the ability to resist electromagnetic interference is weak. In actual use, the reliability is poor and the failure rate is high; due to the internal space of the flowmeter Generally, only six Hall sensors can be arranged, which makes the resolution of the Hall effect rotary piston flowmeter not high, and it is difficult to further improve the measurement accuracy.

Commonly used rotary piston flowmeters use Hall sensors as counters, the signal processing circuit is more complex, the output waveform is not ideal, the ability to resist electromagnetic interference is not strong, the reliability is poor, the failure rate is high, and the cost of use and maintenance is high; due to the flow Due to the limitation of the internal space of the meter, too many Hall sensors cannot be arranged, and the resolution is not high, which makes it difficult to improve the measurement accuracy of the flowmeter.

Utility model content

In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide an opto-electromagnetic coupling rotary piston flowmeter with high precision, high reliability and low failure rate.

In order to achieve the above purpose, the utility model is realized through the following technical solutions: the optical electromagnetic coupling rotary piston flowmeter includes a circulation body and a rotary piston, and the liquid inlet and outlet ends of the circulation body are connected through the metering chamber and the rotary piston ; It also includes an upper magnet, a lower magnet, a photoelectric code disc and a photoelectric sensor; the upper end of the metering chamber is provided with a support cover, and the lower end surface of the lower magnet is fixedly connected with a lever that runs through the support cover. Bearings are fitted between the covers, and the lower end of the shift rod is connected to the top of the rotary piston in transmission; the support cover is provided with a gland covering the upper magnet and the lower magnet, and the upper magnet and the lower magnet are provided with a The sealing partition of the circulation main body is sealed and matched; the upper magnet is coupled with the lower magnet and is located directly above the lower magnet; On the top surface of the cover, the photoelectric code disc is set on the upper end of the rotating shaft, and the photoelectric sensor is arranged on the top surface of the gland, at a position corresponding to the photoelectric code disc.

Both the upper magnet and the lower magnet are ring magnets.

Both the upper magnet and the lower magnet are annular rubidium magnets.

A rubber sealing ring is provided at the joint between the sealing partition and the circulation main body.

The beneficial effects of the utility model are: the optical electromagnetic coupling rotary piston flowmeter of the utility model not only improves the accuracy and Reliability, reducing the failure rate. Since the upper magnet and the lower magnet are ring magnets, the coupling performance of the upper magnet and the lower magnet is good, and the stability is high during the rotation process, which improves the accuracy and reliability of the entire opto-electromagnetic coupling rotary piston flowmeter. Since the rubber sealing ring is provided at the joint between the sealing partition and the circulation main body, the sealing performance is improved, the damage to electronic equipment and circuits such as photoelectric code discs and photoelectric sensors is effectively prevented, and the failure rate is reduced.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the optical electromagnetic coupling rotary piston flowmeter of the present invention;

Fig. 2 is a top view structural diagram of the optical-electromagnetic coupling rotary piston flowmeter of the present invention;

In the figure, 1—photoelectric code disc, 2—photoelectric sensor, 3—rotating shaft, 4—bearing, 5—gland, 6—upper magnet, 7—lower magnet, 8—sealing partition, 9—driving rod, 10— Rotary piston, 11—circulation main body, 12—liquid inlet end, 13—liquid outlet end, 14—central axis of the metering chamber, 15—central axis of the piston, 16—metering chamber. 17—liquid inlet, 18—liquid outlet, 19—partition plate, 20—support cover.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited to the following description.

As shown in Figures 1 and 2, the optical-electromagnetic coupling rotary piston flowmeter of the present invention includes a circulation body 11 and a rotary piston 10, and the liquid inlet and outlet ends of the circulation body 11 pass through the metering chamber 16 and The rotary piston 10 is connected; it also includes an upper magnet 6, a lower magnet 7, a photoelectric code disc 1 and a photoelectric sensor 2; the upper end of the metering chamber 16 is provided with a support cover 20, and the lower end surface of the lower magnet 7 is fixedly connected with a The driving rod 9 of the support cover, the bearing 4 is matched between the driving rod 9 and the supporting cover 20, and the lower end of the driving rod 9 is connected to the top of the rotary piston in transmission; The gland 5 of the magnet 7 is provided with a sealing partition 8 sealingly fitted with the circulation main body 11 between the upper magnet 6 and the lower magnet 7; the upper magnet 6 is coupled with the lower magnet 7 and is positioned at the front Above, the gland 5 is equipped with a rotating shaft 3 fixedly connected to the upper magnet 6 through a bearing 4, the upper end of the rotating shaft 3 protrudes from the top surface of the gland 5, and the photoelectric code disc 1 is set on the shaft 3 On the upper end, the photoelectric sensor 2 is arranged on the top surface of the pressing cover 5 at a position corresponding to the photoelectric code disc 1 . The optical-electromagnetic coupling rotary piston flowmeter of the utility model not only improves the entire optical-electromagnetic coupling rotation through the cooperation of the upper magnet 6, the lower magnet 7, the gland 5, the photoelectric code disc 1, and the photoelectric sensor 2, etc. The accuracy and reliability of the piston flowmeter, and reduce the failure rate. During use, the liquid enters from the liquid inlet 12 of the circulation body 11, and the rotary piston 10 rotates under the impetus of the liquid, and delivers the liquid in the rotary piston 10 and the metering chamber 16 to the liquid outlet of the circulation body 11, and the rotary piston 10 Every rotation, the flowmeter flows out a fixed volume of liquid, the rotation frequency of the rotary piston 10 is the same as the rotation frequency of the lower magnet 7, and the lower magnet 7 is coupled with the upper magnet 6, so that the upper magnet 6 rotates synchronously, driving the photoelectric encoder 1 to rotate, The photoelectric sensor 2 measures and calculates the rotational speed of the rotary piston 10 according to the rotation of the photoelectric code disc 1, and can display the corresponding flow rate. It is worth noting that the measurement principle of the utility model is that the liquid flows in from the liquid inlet 12, flows into the metering chamber 16 through the liquid inlet 17, and keeps a constant volume between the rotary piston 10, the metering chamber 16 and the support cover 20. In the metering space, the rotary piston 10 is used as the main metering element. The contact line between the partition 19 and the rotary piston 10 and the inner wall of the metering chamber 16 divides the entire metering space into an inlet chamber and an outlet chamber. Under the action of the pressure difference between the inlet chamber and the outlet chamber, A rotational torque is formed to drive the rotary piston 10 to rotate, and the central axis 15 of the piston rotates around the central axis 14 of the metering chamber. The rotary piston 10 discharges a fixed volume of fluid from the liquid outlet 18 every time the piston rotates.

As preferably, described upper magnet 6 and lower magnet 7 are ring magnets, and the magnetic field line of ring magnet is more uniform than the magnetic field line of the magnet of square shape or other shape, makes upper magnet 6 and lower magnet 7 coupling performances Well, the stability is high during rotation, which improves the accuracy and reliability of the whole opto-electromagnetic coupling rotary piston flowmeter.

Further, the upper magnet 6 and the lower magnet 7 are ring-shaped rubidium magnets, and the magnetism of the ring-shaped rubidium magnets is quite strong, which makes the coupling performance of the upper magnet 6 and the lower magnet 7 better, and further improves the overall optical electromagnetic coupling rotary piston type. Accuracy and reliability of the flowmeter.

Preferably, a rubber sealing ring is provided at the joint between the sealing partition 8 and the circulation main body 11, which improves the sealing performance, effectively prevents the damage of electronic equipment and circuits such as the photoelectric code disc 1 and the photoelectric sensor 2, and reduces the failure rate.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. Optical electromagnetic coupling rotary piston flowmeter, comprising a flow body (11) and a rotary piston (10), the liquid inlet (12) and liquid outlet (13) of the flow body (11) pass through the metering chamber ( 16) is connected with the rotary piston (10); it is characterized in that: it also includes an upper magnet (6), a lower magnet (7), a photoelectric code disc (1) and a photoelectric sensor (2); the upper end of the metering chamber (16) A support cover (20) is provided, and the lower end surface of the lower magnet (7) is fixedly connected with a lever (9) that runs through the support cover (20), and the lever (9) cooperates with the support cover (20) There is a bearing (4), and the lower end of the driving rod (9) is connected to the top of the rotary piston (10) by transmission; the support cover (20) is provided with a gland that covers the upper magnet (6) and the lower magnet (7) (5), between the upper magnet (6) and the lower magnet (7) is provided with a sealing partition (8) that is sealingly matched with the circulation body (11); the upper magnet (6) and the lower magnet ( 7) Coupling and located directly above the lower magnet (7), the gland (5) is equipped with a shaft (3) fixedly connected to the upper magnet (6) through a bearing (4), the upper end of the shaft (3) Stretch out the top surface of the gland (5), the photoelectric code disc (1) is set on the upper end of the rotating shaft (3), the photoelectric sensor (2) is arranged on the top surface of the gland (5), and the photoelectric code The corresponding position of disk (1). 2. The opto-electromagnetic coupling rotary piston flowmeter according to claim 1, characterized in that: the upper magnet (6) and the lower magnet (7) are ring magnets. 3. The opto-electromagnetic coupling rotary piston flowmeter according to claim 1, characterized in that: the upper magnet (6) and the lower magnet (7) are ring-shaped rubidium magnets. 4. The opto-electromagnetic coupling rotary piston flowmeter according to any one of claims 1 to 3, characterized in that: the joint between the sealing partition (8) and the circulation body (11) is provided with a rubber sealing ring.