CN210242871U

CN210242871U - Low-resistance high-precision liquid flow measuring equipment

Info

Publication number: CN210242871U
Application number: CN202020221305.6U
Authority: CN
Inventors: Rongbo Liu; 刘荣波; Daquan Zhou; 周大泉
Original assignee: Zhi Maide Co ltd
Current assignee: Zhi Maide Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-04-03
Anticipated expiration: 2030-02-28

Abstract

The utility model discloses a low resistance high accuracy liquid flow measuring equipment, including the flowmeter casing, be equipped with fluid inlet, rotor chamber and the fluid outlet of intercommunication in the flowmeter casing, install the rotor in the rotor chamber, the rotor includes rotor body and turbine blade, rotor body includes plasticity main part and metal counterweight, be equipped with a plurality of flow measurement magnet on the turbine blade, rotor chamber periphery be equipped with flow measurement magnet position complex flow measurement sensor. The rotor can rotate along with the liquid flow under the pushing of the extremely light liquid flow through the rotor structure completely suspended in the liquid, and the flow measurement magnet and the flow measurement sensor which are divided into a plurality of layers and a plurality of layers on the rotor and the flowmeter shell are arranged in pairs, so that the flow signal detection precision is improved in multiples, and the high-precision liquid flow measurement under the low-resistance structure is realized.

Description

Low-resistance high-precision liquid flow measuring equipment

Technical Field

The utility model relates to a flow monitoring field, specifically say and relate to a low resistance high accuracy liquid flow measuring equipment.

Background

In the field of liquid flow monitoring, various flow meters are required to measure liquid flow. The current flow meters include differential pressure type flow meters, target type flow meters, volumetric flow meters, turbine type flow meters, electromagnetic flow meters, vortex street flow meters, ultrasonic flow meters, coriolis mass flow meters, thermal mass flow meters, metal rotor flow meters, etc., the most widely applied is the differential pressure type flow meters which are mainly applied to liquid flow detection of large flow, while the turbine type flow meters are the main type of velocity type flow meters, and the structure of the turbine type flow meters is meters which adopt a multi-blade rotor (namely a turbine) to sense the flow velocity of fluid, thereby deriving the flow or the total amount. The turbine flowmeter is one of ten types of flowmeters, and the volumetric flowmeter and the mass flowmeter are called as three types of products with high repeatability and high precision in the flowmeters. The general turbine flowmeter comprises three parts, namely a rotor part, a sensor and a display part. The design of a rotor part in the prior turbine flowmeter has the defects that the rotor has large mass and large friction force with a shell, so that the flow resistance of the flowmeter to fluid is increased, and the measurement accuracy of the flow is also adversely affected.

Therefore, the application discloses a low-resistance high-precision liquid flow measuring device with small fluid flow resistance and high measuring precision.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the weak point of above-mentioned conventional art, provide a low resistance high accuracy liquid flow measuring equipment that fluid flow resistance is little, measurement accuracy is high.

The purpose of the utility model is achieved through the following technical measures:

low resistance high accuracy liquid flow measuring equipment, including the flowmeter casing, be equipped with fluid inlet, rotor chamber and the fluid outlet of intercommunication in the flowmeter casing, install rotor, its characterized in that in the rotor chamber: the rotor includes rotor body and turbine blade, the turbine blade sets up around rotor body, turbine blade outer peripheral edges and rotor chamber internal surface sliding contact, rotor body includes plastics main part and metal counterweight, the coaxial setting of plastics main part and metal counterweight, be equipped with a plurality of flow measurement magnet on the turbine blade, a plurality of flow measurement magnet is along rotor major axis direction equipartition, rotor chamber periphery be equipped with flow measurement magnet position complex flow measurement sensor. Wherein the plastic body and the metal weight have an average density equal to the measured liquid density, such that the rotor body is suspended in the measured liquid. Specifically, if the measured liquid density is ρ 0, the plastic body density is ρ 1, the volume is V1, the metal weight body density is ρ 2, and the volume is V2, the volume ratio of the plastic body and the metal weight body conforms to the formula ρ 0= (V1 × ρ 1+ V2 × ρ 2)/(V1 + V2).

Preferably, the flow measuring sensors are uniformly distributed along the circumference of the rotor cavity.

Preferably, at least one flow measuring sensor is arranged on each flow measuring magnet position plane.

Preferably, a buffer chamber is provided between the rotor chamber and the fluid inlet.

As a preferable scheme, the buffer chamber is connected with an overpressure sensing device, the overpressure sensing device comprises an overpressure sensing chamber, a sensing piston, a sensing pressure adjusting spring and a sensing component, the sensing component comprises an overpressure monitoring magnet and an overpressure monitoring sensor, the overpressure monitoring magnet is arranged on the sensing piston, the overpressure monitoring sensor is arranged on one side, facing the sensing piston, of the overpressure sensing chamber, the overpressure monitoring magnet and the overpressure monitoring sensor are correspondingly arranged in positions, the overpressure sensing chamber is communicated with the buffer chamber through an overpressure sensing inlet, the sensing piston is pushed by the sensing pressure adjusting spring to close the overpressure sensing inlet, and when the pressure in the buffer chamber exceeds the elastic force of the sensing pressure adjusting spring, liquid pressure pushes the sensing piston and the overpressure monitoring magnet to move towards the overpressure monitoring sensor and trigger the overpressure monitoring sensor.

As a preferable scheme, the flowmeter casing comprises an inlet casing, a middle casing and an outlet casing, one end of the middle casing is in threaded connection with the inlet casing, the other end of the middle casing is in threaded connection with the outlet casing, and the buffer cavity is formed by a cavity between the inlet casing and the middle casing.

Owing to adopted above-mentioned technical scheme, compare with prior art, the utility model has the advantages that:

the utility model discloses a low resistance high accuracy liquid flow measuring equipment, through suspending the rotor structure in liquid completely, make the frictional force between rotor and flowmeter casing reduce to almost negligible degree, this structure makes the rotor can be under the promotion of the liquid flow of utmost point and little will be rotatory along with the liquid flow, and detect the liquid flow signal, flow measurement magnet and flow measurement sensor pair through dividing into several layers and every layer several on rotor and the flowmeter casing sets up, the improvement of doubling flow signal detection's precision, high accuracy liquid flow measurement under the low resistance structure has been realized.

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Drawings

Fig. 1 is the structure schematic diagram of the low-resistance high-precision liquid flow measuring device of the utility model.

Fig. 2 is an enlarged schematic view of the rotor of fig. 1.

Detailed Description

Example (b): as shown in fig. 1 and 2, the low-resistance high-precision liquid flow measuring device comprises a flow meter casing 1, a fluid inlet 14, a rotor cavity 16 and a fluid outlet 17 are arranged in the flow meter casing 1, a rotor 31 is arranged in the rotor cavity 16, the rotor 31 comprises a rotor body 31a and turbine blades 31b, the turbine blades 31b are arranged around the rotor body 31a, the outer periphery of the turbine blades 31b is in sliding contact with the inner surface of the rotor cavity 16, the rotor body 31a comprises a plastic main body 35 and metal weights 34, the plastic main body 35 and the metal weights 34 are coaxially arranged, the plastic main body 35 and the metal weights 34 are proportioned to enable the rotor body 31a to be suspended in liquid, a plurality of magnets 32 are arranged on the flow measuring turbine blades 31b, and the plurality of magnets 32 are uniformly distributed along the long axis direction of the rotor 31, the rotor chamber 16 is provided at its outer periphery with a flow measuring sensor 33 which is positionally coordinated with the flow measuring magnet 32. The structural proportion of the plastic main body 35 and the metal counterweight body 34 is determined by the density of the detected liquid, and the two are adjusted to be the same as the density of the liquid, so that the effect of completely suspending the rotor 31 in the liquid can be achieved, the friction between the rotor 31 and the periphery is avoided, the rotation sensitivity of the rotor 31 is greatly improved, and the detection precision is improved.

The flow measuring sensors 33 are uniformly distributed along the periphery of the rotor cavity 16 in the circumferential direction; at least one flow measuring sensor 33 is arranged in the plane of the flow measuring magnet 32. In the drawing, only one flow measurement sensor 33 is shown on each position plane of the flow measurement magnet 32, and a product can be provided with a plurality of flow measurement sensors 33 according to the accuracy requirement of flow monitoring, and the flow measurement sensors 33 are arranged in multiple layers, so that the number of the flow measurement sensors 33 triggered by each rotation of the rotor 31 is greatly increased, and the detection density and the detection accuracy are greatly improved.

A buffer chamber 15 is provided between the rotor chamber 16 and the fluid inlet 14. The volume of the buffer cavity 15 is greatly higher than the liquid volume between the rotor 31 and the rotor cavity 16, so that the impact of the high-speed liquid jet on the rotor 31 is well slowed down, the rotation of the rotor 31 is more in line with the actual flow and the flow speed of the liquid, and the flow monitoring precision is greatly improved.

The buffer chamber 15 is connected with an overpressure sensing device, which comprises an overpressure sensing chamber 25, a sensing piston 21, a sensing pressure adjusting spring 22 and a sensing component, the sensing means comprise an overpressure monitoring magnet 23 and an overpressure monitoring sensor 24, the overpressure monitoring magnet 23 being arranged on the sensing piston 21, the overpressure monitoring sensor 24 is mounted on the side of the overpressure sensing chamber 25 facing the sensing piston 21, the overpressure monitoring magnet 24 and the overpressure monitoring sensor 24 are correspondingly arranged in position, the overpressure sensing cavity 25 is communicated with the buffer cavity 15 through the overpressure sensing inlet 20, the sensing piston 21 is pushed by the sensing pressure adjusting spring 22 to close the overpressure sensing inlet 20, and the sensing piston 21 and the overpressure monitoring magnet 23 are pushed by liquid pressure to move towards the overpressure monitoring sensor 24 and trigger the overpressure monitoring sensor 24 when the pressure in the buffer cavity 15 exceeds the elastic force of the sensing pressure adjusting spring 22. The overpressure sensing device sends out an alarm signal when the liquid pressure exceeds the standard, so that the situation that the measuring equipment is damaged due to high pressure is avoided.

Flowmeter casing 1 includes entry casing 11, middle casing 12 and export casing 13, the one end and the entry casing 11 spiro union of middle casing 12, the other end and the export casing 13 spiro union of middle casing 12, buffer chamber 15 comprises the cavity between entry casing 11 and middle casing 12. The split type shell design makes measuring equipment install, easy to maintain and adjust equipment more easily.

Claims

1. Low resistance high accuracy liquid flow measuring equipment, including the flowmeter casing, be equipped with fluid inlet, rotor chamber and the fluid outlet of intercommunication in the flowmeter casing, install rotor, its characterized in that in the rotor chamber: the rotor includes rotor body and turbine blade, the turbine blade sets up around rotor body, turbine blade outer peripheral edges and rotor chamber internal surface sliding contact, rotor body includes plastics main part and metal counterweight, the coaxial setting of plastics main part and metal counterweight, be equipped with a plurality of flow measurement magnet on the turbine blade, a plurality of flow measurement magnet is along rotor major axis direction equipartition, rotor chamber periphery be equipped with flow measurement magnet position complex flow measurement sensor.

2. The low resistance, high accuracy liquid flow measurement device of claim 1, wherein: the flow measurement sensors are circumferentially and uniformly distributed along the periphery of the rotor cavity.

3. The low resistance, high accuracy liquid flow measurement device of claim 1, wherein: and each flow measurement magnet position plane is at least provided with one corresponding flow measurement sensor.

4. A low resistance high accuracy liquid flow measurement device according to any one of claims 1 to 3, wherein: a buffer chamber is provided between the rotor chamber and the fluid inlet.

5. The low resistance, high accuracy liquid flow measurement device of claim 4, wherein: the buffer cavity is connected with an overpressure sensing device, the overpressure sensing device comprises an overpressure sensing cavity, a sensing piston, a sensing pressure adjusting spring and a sensing component, the sensing component comprises an overpressure monitoring magnet and an overpressure monitoring sensor, the overpressure monitoring magnet is arranged on the sensing piston, the overpressure monitoring sensor is arranged on one side, facing the sensing piston, of the overpressure sensing cavity, the overpressure monitoring magnet and the overpressure monitoring sensor are correspondingly arranged in position, the overpressure sensing cavity is communicated with the buffer cavity through an overpressure sensing inlet, the sensing piston is pushed by the sensing pressure adjusting spring to seal the overpressure sensing inlet, and when the pressure in the buffer cavity exceeds the elastic force of the sensing pressure adjusting spring, liquid pressure pushes the sensing piston and the overpressure monitoring magnet to move towards the overpressure monitoring sensor and trigger the overpressure monitoring sensor.

6. The low resistance, high accuracy liquid flow measurement device of claim 4, wherein: the flowmeter casing includes entry casing, middle casing and export casing, the one end and the entry casing spiro union of middle casing, the other end and the export casing spiro union of middle casing, the cushion chamber comprises the cavity between entry casing and the middle casing.