Impeller type fluid measuring device

Abstract

The utility model discloses an impeller type fluid measuring device, which comprises an impeller shell, an impeller, an impeller shaft, a magnet and a magnetic sensor, the impeller shell is provided with a liquid inlet and a liquid outlet, the impeller shaft is arranged in the impeller shell, the impeller is sleeved on the impeller shaft, the upper surface of an impeller hub extends upwards along the axial direction of the impeller to form a bulge, and the magnetic sensor is arranged on the impeller hub. The position of the protrusion is higher than the impeller blades, the magnet is installed on the protrusion, a magnetic inductor is arranged outside the impeller shell, the magnet is matched with the magnetic inductor, and the impeller has the advantages of being simple in structure, low in cost, good in detection effect, long in service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid measurement, in particular to an impeller type fluid measuring device. Background Art

[0002] In the prior art, an impeller flowmeter is used to obtain the flow rate of the pipeline medium. The existing impeller flowmeter includes an impeller housing and an impeller arranged in the impeller housing. The impeller housing is provided with a liquid inlet and a liquid outlet. A magnet is installed on the impeller. The rotation of the impeller drives the rotation of the magnet on the impeller. The magnetic sensor senses the change of the magnetic field of the magnet and converts these changes into electrical signals. The rotation speed of the impeller can be measured, and the flow rate of the fluid in the pipeline can be obtained according to the impeller rotation speed.

[0003] The shortcomings of the existing technology are: first, the fluid will corrode the magnet on the impeller, affecting the detection effect and shortening the service life of the magnet; second, the corrosion of the magnet will also affect the fluid; third, when the fluid enters from the liquid inlet of the impeller casing, drives the impeller to rotate and then flows out from the liquid outlet, if the fluid cannot flow out smoothly from the liquid outlet, it will eventually affect the accuracy of the magnetic sensor detection. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies in the prior art and to provide an impeller type fluid measuring device with simple structure, low cost, good detection effect and long service life.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An impeller type fluid measuring device, characterized in that it comprises an impeller housing, an impeller, an impeller shaft, a magnet and a magnetic sensor, wherein the impeller housing is provided with a liquid inlet and a liquid outlet, the impeller housing is provided with an impeller shaft, and the impeller is sleeved on the impeller shaft;

[0007] The upper surface of the impeller hub extends upward along the axial direction of the impeller to form a protrusion, the protrusion is located higher than the impeller blades, the magnet is installed on the protrusion, and the magnet cooperates with the magnetic sensor;

[0008] The impeller is driven to rotate by the flow of fluid, and the magnet moves in a circular motion with the impeller. The rotation speed of the impeller is proportional to the flow rate of the fluid. When the impeller rotates, the magnetic sensor will sense the changes in the magnetic field of the magnet and convert these changes into electrical signals. The rotation speed of the impeller can be measured, and the fluid flow in the pipeline can be obtained based on the impeller rotation speed. The installation position of the magnet makes the position of the magnet higher than the impeller blades. When the fluid drives the impeller to rotate, the fluid will not corrode the magnet, preventing it from affecting the detection effect. At the same time, it can also effectively prevent the influence of magnet corrosion on the fluid, and has a long service life.

[0009] The utility model discloses a magnet placement groove on the upper surface of the protrusion, wherein the magnet is a bar magnet and is vertically placed in the magnet placement groove; the structure is simple, so that the magnet can be a conventional magnet to realize the magnetic sensor sensing magnetic field changes and converting them into electrical signals.

[0010] The impeller housing of the utility model is provided with an upper opening, and the upper opening is covered with an impeller upper cover;

[0011] A protrusion receiving groove is provided in the middle of the impeller upper cover, and the protrusion is inserted into the protrusion receiving groove, thereby further preventing the fluid from splashing onto the magnet.

[0012] The height of the inner wall of the impeller upper cover of the utility model matches the height of the upper surface of the impeller blades.

[0013] The utility model provides an annular protrusion extending upward near the impeller shaft on the upper surface of the impeller hub, and an annular upper cover limiting groove is opened downward on the outer side of the protrusion on the upper surface of the impeller hub, and the inner wall of the impeller upper cover extends downward at the outer periphery of the protrusion accommodating groove to form a limiting ring, and the position of the limiting ring matches the position of the upper cover limiting groove. When the impeller upper cover is covered at the upper opening, the protrusion is inserted into the protrusion accommodating groove, and the limiting ring is inserted into the upper cover limiting groove. The matching of the limiting ring and the upper cover limiting groove not only facilitates the positioning and installation of the impeller upper cover, but also can further effectively prevent the fluid in the impeller housing from splashing onto the magnet through the limiting ring.

[0014] The impeller upper cover of the utility model continues to extend upward in the raised accommodating groove to form an impeller shaft upper limit groove, the bottom of the impeller housing is provided with an impeller shaft lower limit groove, the upper end of the impeller shaft is inserted into the impeller shaft upper limit groove, and the lower end is inserted into the impeller shaft lower limit groove; assembly and maintenance are convenient.

[0015] The upper opening of the impeller housing of the utility model is covered with an O-shaped sealing ring;

[0016] The impeller upper cover is fixed to the impeller housing by bolts.

[0017] An impeller type fluid measuring device, characterized in that it comprises an impeller housing, an impeller, an impeller shaft, a magnet and a magnetic sensor, wherein the impeller housing is provided with a liquid inlet and a liquid outlet, the impeller housing is provided with an impeller shaft, the impeller is sleeved on the impeller shaft, a magnet is mounted on the impeller, and the magnet cooperates with the magnetic sensor;

[0018] A rear flow guide slope with a smooth transition connection is provided between the inner wall of the impeller housing near the liquid outlet and the liquid outlet;

[0019] The rotation direction of the impeller matches the inclination direction of the rear guide slope;

[0020] The rear guide slope is set to enable the fluid to smoothly flow out of the liquid outlet through the slope, thereby ensuring the efficiency of the impeller and the accuracy of the magnetic sensor detection.

[0021] The inclination direction of the rear guide slope of the utility model is tangent to the outer circle of the impeller; this direction is the tangent direction of the maximum force arm of the impeller, which further makes the impeller have higher efficiency and accuracy of magnetic sensor detection.

[0022] The utility model provides that the inner wall of the impeller housing is fixed with a front guide wall and a rear guide wall, the front guide wall and the rear guide wall are arranged front and rear oppositely, the front guide wall and the rear guide wall are arranged in an arc shape with the arc opening facing the middle of the impeller, a left opening connected to the liquid inlet is formed between the left side of the front guide wall and the left side of the rear guide wall, and a right opening connected to the liquid outlet is formed between the right side of the front guide wall and the right side of the rear guide wall;

[0023] The rear guide wall forms a rear guide slope at the right opening which is smoothly connected to the liquid outlet, and the front guide wall forms a front guide slope at the right opening which is parallel to the rear guide slope.

[0024] The beneficial effects of the utility model are as follows: the impeller is driven to rotate by the flow of fluid, and the magnet follows the impeller to make circular motion. The rotation speed of the impeller is proportional to the flow rate of the fluid. When the impeller rotates, the magnetic sensor will sense the changes in the magnetic field of the magnet and convert these changes into electrical signals. The rotation speed of the impeller can be measured. According to the impeller rotation speed, the fluid flow in the pipeline can be obtained. The installation position of the magnet makes the position of the magnet higher than the impeller blades. When the fluid drives the impeller to rotate, the fluid will not corrode the magnet, preventing the detection effect from being affected. At the same time, it can also effectively prevent the influence of magnet corrosion on the fluid, and the service life is long. The rear guide slope in the impeller housing is set so that the fluid can smoothly pass through this slope and flow out from the liquid outlet, thereby ensuring the efficiency of the impeller and the accuracy of the magnetic sensor detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 yes Figure 1 Top view.

[0027] Figure 3 yes Figure 2 Middle AA section view.

[0028] Figure 4 It is a schematic diagram of the structure of the impeller cover hidden in the flow measurement device.

[0029] Figure markings: impeller housing-1, liquid inlet-101, liquid outlet-102, impeller upper cover-2, limiting ring-201, protrusion accommodating groove-202, impeller-3, upper cover limiting groove-301, protrusion-302, impeller shaft-4, magnet placement groove-5, O-ring-6, front guide wall-701, front guide slope-7011, rear guide wall-702, rear guide slope-7021. DETAILED DESCRIPTION

[0030] The utility model is described below in conjunction with the accompanying drawings and embodiments.

[0031] As shown in the accompanying drawings, the impeller-type fluid measuring device comprises an impeller housing 1, an impeller 3, an impeller shaft 4, a magnet and a magnetic sensor. The impeller housing 1 is provided with a liquid inlet 101 and a liquid outlet 102. The impeller housing 1 is provided with an impeller 3 that rotates with the impeller housing 1. The impeller housing 1 is provided with an impeller shaft 4. The impeller 3 is sleeved on the impeller shaft 4 and is rotationally or fixedly connected to the impeller shaft 4.

[0032] The upper surface of the impeller 3 hub extends upward along the impeller axial direction to form a protrusion 302, the protrusion 302 is located higher than the blades of the impeller 3, the magnet is installed on the protrusion 302, a magnetic sensor is provided outside the impeller housing 1, and the magnet cooperates with the magnetic sensor; the magnetic sensor is connected to the controller, and the controller in this embodiment can be a PLC controller or a controller developed based on MCU;

[0033] The impeller 3 is driven to rotate by the fluid flow, and the magnet follows the impeller 3 to make a circular motion. The rotation speed of the impeller 3 is proportional to the flow rate of the fluid. When the impeller 3 rotates, the magnetic sensor will sense the changes in the magnetic field of the magnet and convert these changes into electrical signals. The rotation speed of the impeller 3 can be measured. According to the rotation speed of the impeller 3, the fluid flow in the pipeline can be obtained. The installation position of the magnet makes the position of the magnet higher than the blades of the impeller 3. When the fluid drives the impeller 3 to rotate, the fluid will not corrode the magnet, preventing the detection effect from being affected. At the same time, it can also effectively prevent the influence of magnet corrosion on the fluid, and the service life is long.

[0034] The upper surface of the protrusion 302 is provided with a magnet placement groove 5, and the magnet is placed in the magnet placement groove 5; in this embodiment, the magnet is a bar magnet, and the magnet is vertically placed in the magnet placement groove 5; the structure is simple, so that the magnet can use a conventional magnet to realize the magnetic sensor sensing the magnetic field change and converting it into an electrical signal.

[0035] In this embodiment, a plurality of magnet placement grooves 5 are provided on the upper surface of the protrusion 302 at intervals, and a magnet is placed in each magnet placement groove 5 .

[0036] The impeller housing 1 is provided with an upper opening, and the upper opening is covered with an impeller upper cover 2, and an O-ring 6 is sleeved on the upper opening to ensure the sealing of the impeller upper cover 2 after it is covered. The impeller upper cover 2 is fixed to the impeller housing 1 by bolts.

[0037] The height of the inner wall of the impeller upper cover 3 matches the height of the upper surface of the impeller 3 blades.

[0038] The middle part of the impeller upper cover 2 extends upward to form a protrusion receiving groove 202 opening downward, and the protrusion 302 is inserted into the protrusion receiving groove 202, thereby further preventing the fluid from splashing onto the magnet.

[0039] In this embodiment, a protrusion 302 is formed on the upper surface of the impeller hub at a position close to the impeller shaft 4 and extends upward. A circular upper cover limiting groove 301 is opened downward on the outer side of the protrusion 302 on the upper surface of the impeller hub of the impeller 3. The inner wall of the impeller upper cover 2 extends downward at the periphery of the protrusion accommodating groove 202 to form a limiting ring 201. The position of the limiting ring 201 matches the position of the upper cover limiting groove 301. When the impeller upper cover 2 is covered at the upper opening, the protrusion 302 is inserted into the protrusion accommodating groove 202, and the limiting ring 201 is inserted into the upper cover limiting groove 301. The matching of the limiting ring 201 and the upper cover limiting groove 301 not only facilitates the positioning and installation of the impeller upper cover 2, but also can further effectively prevent the fluid in the impeller housing 1 from splashing onto the magnet through the limiting ring 201.

[0040] The impeller upper cover 2 continues to extend upward in the protrusion receiving groove 202 to form an impeller shaft upper limit groove, and the bottom of the impeller housing 1 is provided with an impeller shaft lower limit groove. In this embodiment, the impeller 3 is rotatably matched with the impeller shaft 204, and the upper end of the impeller shaft 4 is inserted in the impeller shaft upper limit groove, and the lower end is inserted in the impeller shaft lower limit groove; assembly and maintenance are convenient.

[0041] A front guide wall 701 and a rear guide wall 702 are fixed to the inner wall of the impeller housing 1. The front guide wall 701 and the rear guide wall 702 are arranged front and rear opposite to each other. The front guide wall 701 and the rear guide wall 702 are arranged in an arc shape with the arc opening facing the middle of the impeller 3. A left opening connected to the liquid inlet 101 is formed between the left side of the front guide wall 701 and the left side of the rear guide wall 702, and a right opening connected to the liquid outlet 102 is formed between the right side of the front guide wall 701 and the right side of the rear guide wall 702.

[0042] The rear guide wall 702 forms a rear guide slope 7021 smoothly connected to the liquid outlet 102 at the right opening, and the front guide wall 701 forms a front guide slope 7011 parallel to the rear guide slope at the right opening;

[0043] The impeller rotation direction matches the inclination direction of the rear guide slope 7021;

[0044] The rear guide slope 7021 is arranged to enable the fluid to smoothly flow out of the liquid outlet through the slope, thereby ensuring the efficiency of the impeller and the accuracy of the magnetic sensor detection.

[0045] The inclination direction of the rear guide slope 7021 is tangent to the outer circle of the impeller; this direction is the tangent direction of the maximum force arm of the impeller, which further makes the impeller have higher efficiency and the accuracy of magnetic sensor detection.

[0046] When the utility model is used:

[0047] The fluid enters the impeller housing 1 from the liquid inlet 101 of the impeller housing 1, and the impeller 3 is driven to rotate by the fluid flow. The magnet follows the impeller 3 to make a circular motion. The rotation speed of the impeller 3 is proportional to the flow rate of the fluid. When the impeller 3 rotates, the magnetic sensor will sense the changes in the magnetic field of the magnet and convert these changes into electrical signals. The rotation speed of the impeller 3 can be measured to obtain the fluid flow rate. The fluid flows out from the liquid outlet 102 of the impeller housing along the direction of the rear guide wall 702 and the rear guide slope 7021.

Claims

1. An impeller type fluid measuring device, characterized in that: It includes an impeller housing, an impeller, an impeller shaft, a magnet and a magnetic sensor, wherein the impeller housing is provided with a liquid inlet and a liquid outlet, the impeller housing is provided with an impeller shaft, and the impeller is sleeved on the impeller shaft; The upper surface of the impeller hub extends upward along the axial direction of the impeller to form a protrusion, the position of the protrusion is higher than the impeller blades, the magnet is installed on the protrusion, and the magnet cooperates with the magnetic sensor.

2. The impeller type fluid measuring device according to claim 1, characterized in that: A magnet placement groove is provided on the upper surface of the protrusion. The magnet is a bar magnet and is vertically placed in the magnet placement groove.

3. An impeller type fluid measuring device according to claim 1 or 2, characterized in that: The impeller housing is provided with an upper opening, and the upper opening is covered with an impeller upper cover; A protrusion accommodating groove is provided in the middle of the impeller upper cover, and the protrusion is inserted into the protrusion accommodating groove.

4. The impeller type fluid measuring device according to claim 3, characterized in that: The height of the inner wall of the impeller upper cover matches the height of the upper surface of the impeller blades.

5. The impeller type fluid measuring device according to claim 4, characterized in that: A ring-shaped protrusion is extended upward on the upper surface of the impeller hub near the impeller shaft, and a ring-shaped upper cover limiting groove is opened downward on the outer side of the protrusion on the upper surface of the impeller hub. The inner wall of the impeller upper cover extends downward on the outer periphery of the protrusion accommodating groove to form a limiting ring. The position of the limiting ring matches the position of the upper cover limiting groove. When the impeller upper cover is covered at the upper opening, the protrusion is inserted in the protrusion accommodating groove, and the limiting ring is inserted in the upper cover limiting groove.

6. The impeller type fluid measuring device according to claim 3, characterized in that: The impeller upper cover continues to extend upward in the raised accommodating groove to form an impeller shaft upper limit groove, the impeller housing bottom is provided with an impeller shaft lower limit groove, the impeller shaft upper end is inserted into the impeller shaft upper limit groove, and the lower end is inserted into the impeller shaft lower limit groove.

7. The impeller type fluid measuring device according to claim 3, characterized in that: An O-ring is sleeved on the upper opening of the impeller housing; The impeller upper cover is fixed to the impeller housing by bolts.

8. An impeller type fluid measuring device, characterized in that: It includes an impeller housing, an impeller, an impeller shaft, a magnet and a magnetic sensor. The impeller housing is provided with a liquid inlet and a liquid outlet. The impeller housing is provided with an impeller shaft. The impeller is sleeved on the impeller shaft. The impeller is provided with a magnet, and the magnet cooperates with the magnetic sensor. A rear flow guide slope with a smooth transition connection is provided between the inner wall of the impeller housing near the liquid outlet and the liquid outlet; The rotation direction of the impeller matches the inclination direction of the rear guide slope.

9. The impeller type fluid measuring device according to claim 8, characterized in that: The inclination direction of the rear guide slope is tangent to the outer circle of the impeller.

10. An impeller type fluid measuring device according to claim 8 or 9, characterized in that: A front guide wall and a rear guide wall are fixed to the inner wall of the impeller housing, the front guide wall and the rear guide wall are arranged opposite to each other in front and back, the front guide wall and the rear guide wall are arranged in an arc shape with the arc opening facing the middle of the impeller, a left opening connected to the liquid inlet is formed between the left side of the front guide wall and the left side of the rear guide wall, and a right opening connected to the liquid outlet is formed between the right side of the front guide wall and the right side of the rear guide wall; The rear guide wall forms a rear guide slope at the right opening which is smoothly connected to the liquid outlet, and the front guide wall forms a front guide slope at the right opening which is parallel to the rear guide slope.

Images