KR200339666Y1 - Flow sensor - Google Patents

Abstract

The present invention relates to a flow sensor, the purpose of which is to rotate the rotor in which the magnet is installed more smoothly and to detect accurate data.

To this end, according to the flow sensor according to the present invention, the top end of the rotation shaft 32 of the rotor 30 is arranged to maintain a predetermined gap with the bottom surface of the cap 20, the magnet on the top of the rotation shaft 32 of the rotor 30 40 is accommodated and the buoyancy generating portion 33 having a bottom surface 33a and a cylindrical side surface 33b of a predetermined diameter so as to receive buoyancy by the fluid passing through the flow space 11 of the sensor housing 10 integrally. It is prepared. Therefore, the rotor 30 is slightly floated upward by the buoyancy generator 33 while rotating, and thus, the frictional axis between the rotation shaft 32 and the cap 20 of the rotor 30 is minimized. ) Damage is prevented. In addition, since the rotation of the rotor 30 is made more smoothly, there is an effect of detecting accurate data through the hall sensor 51.

Description

Flow sensor {FLOW SENSOR}

The present invention relates to a flow rate sensor used in a boiler, and more particularly, to a flow rate sensor for detecting the flow rate through the number of revolutions of the rotor by the fluid passing through.

In general, the flow sensor is used to detect the flow of fluid in a boiler or a water heater, etc. FIG. 1 schematically illustrates the internal structure of a conventional flow sensor.

Referring to FIG. 1, a conventional flow sensor includes a housing 1 having a circular flow space 1b formed therein and having an inlet 1a and an outlet 1b opposed to left and right sides, and a flow of the housing 1. The rotor 3 is rotatably installed in the space 1b through the shaft 2 and provided with a plurality of vanes 3a radially, and the rotor 3 while closing the opening 1b of the distribution space 1b of the housing 1. Is rotatably supported and has a cap 4 on which the PCB 6 is installed.

In addition, a ring-shaped magnet 5 is disposed above the rotating shaft 3b of the rotor 3, and the hall sensor 7 is embedded in the cap 4 so as to maintain a constant distance from the side surface of the magnet 5. The hall sensor 7 is electrically connected to the PCB 6.

Therefore, the rotor 3 having the magnet 5 disposed therein is in the process of fluid flowing into the distribution space 1b through the inlet 1a of the housing 1 and then out through the outlet 1c (see arrow direction). It rotates, and the PCB 6 detects the rotational speed of the rotor 3 through the hall sensor 7 to calculate the flow rate.

However, in such a conventional flow sensor, since the rotating shaft 3b of the rotor 3 supported by the shaft 2 rotates continuously with the bottom of the cap 4, the rotor due to frictional wear when the flow sensor is used for a long time The rotating shaft 3b of (3) is easily damaged.

In addition, when the rotor 3 rotates, the frictional force between the rotating shaft 3b and the cap 4 acts as a rotating load, which causes the rotor 3 to not rotate smoothly and accurate data cannot be detected. There is this.

The present invention is to solve this problem, it is an object of the present invention to improve the rotor is installed the magnet to smoothly rotate and at the same time provide a flow sensor that can detect more accurate data.

1 is a cross-sectional view showing a flow sensor for a conventional boiler.

2 is a plan view of a flow sensor according to the present invention.

3 is an exploded perspective view of a flow sensor according to the present invention.

4 is a cross-sectional view taken along line IV-IV of FIG. 2, showing the internal structure of the flow sensor.

5 is a bottom perspective view of the rotor according to the present invention.

* Description of the symbols for the main parts of the drawings *

10. Sensor housing 11. Distribution space

14.Shaft 20.Cap

30..Rotor 31..Vane

32. Rotating shaft 33. Buoyancy generator

40. Magnet 51. Hall sensor

The present invention for achieving this object is;

A circular circulation space is formed inside the shaft, and the sensor housing is provided with an inlet and an outlet facing each other, and a rotating shaft is fitted to the shaft of the distribution space with a margin, and a plurality of vanes are provided to rotate as the fluid moves. A flow sensor comprising a rotor, a magnet provided in a circumferential direction above the rotor shaft, and a cap coupled to close an opening of a distribution space and having a hall sensor arranged to maintain a constant distance from the magnet,

The top end of the rotation axis of the rotor is arranged to maintain a predetermined gap with the bottom of the cap,

The magnet is accommodated in the upper portion of the rotating shaft of the rotor, characterized in that the buoyancy generating unit having a bottom and a cylindrical side of a predetermined diameter so as to receive buoyancy by the fluid passing through the distribution space is integrally provided.

In addition, the bottom of the buoyancy generating portion is characterized in that the upper portion of the vanes are formed in connection.

In addition, the Hall sensor is characterized in that it is disposed opposite the upper surface of the buoyancy generating unit.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the flow sensor according to the present invention is a sensor housing 10 made of a circular flow space 11 for fluid movement therein, and the distribution space 11 of the sensor housing 10 The rotor 30 is disposed in the rotor 30 is provided with a plurality of vanes 31 so as to rotate in accordance with the movement of the fluid, the magnet 40 provided on the rotary shaft 32 of the rotor 30, and the open space 11 It is coupled to close the part and has a cap in which the Hall sensor (see Fig. 4; 51) is disposed so as to maintain a constant distance from the magnet 40.

The sensor housing 10 forms an external shape of the flow sensor, and the mouth 12 and the outlet 13 are provided on both left and right sides so as to communicate with each other in the middle of the fluid line (not shown). And the circular shaft 11 of the sensor housing 10 is installed on the metal shaft 14, which is to arrange the rotor 30 rotatably.

In addition, the cap 20 is coupled to the screw 21 to close the opening of the distribution space 11 at the upper portion of the sensor housing 10, which includes a hall sensor (see FIG. 4; 51) and a PCB (printed circuit). board) is placed. The hall sensor 51 is disposed to face the upper surface 33c of the buoyancy generator 33 to be described later, and detects the rotation speed of the rotor 30 through the magnet 40.

4 and 5, the rotor 30 includes a rotating shaft 32 freely fitted and coupled to the shaft 14 of the distribution space 11, and a plurality of rotor shafts provided at regular intervals on the outer circumference of the rotating shaft 32. Two vanes 31 are defined. In the embodiment of the present invention, eight vanes 31 are configured at 45 degree intervals, and they rotate the rotor 30 in one direction while contacting the fluid passing through the distribution space 11. In addition, the top end of the rotation shaft 32 of the rotor 30 is arranged so that the bottom surface of the cap 20 and a predetermined gap G (about 0.3 mm in the embodiment of the present invention) are maintained, which is a high speed rotation of the rotor 30. This is to secure a space that can rise slightly.

On the other hand, the upper portion of the rotation shaft 32 of the rotor 30 is provided with a magnet 40 has a ring shape consisting of alternating N and S poles, the magnet 40 is integral to the upper rotation shaft 32 of the rotor 30 It is arranged to be accommodated in the buoyancy generating section (33b), the detailed structure thereof is as follows.

First, the buoyancy generating unit 33b is integrally injection molded on the rotary shaft 32 of the rotor 30 so as to have a bottom surface 33a, a cylindrical side surface 33b, and an upper surface 33c having a predetermined diameter. The magnet 40 is insert fixed in the form of a ring. Accordingly, the center (rotational center) of the rotor 30 can be accurately aligned, and foreign matters mixed into the fluid can be prevented from coming into direct contact with the magnet 40.

And the upper portion of the vanes 31 of the rotor 30 is integrally formed with the bottom of the buoyancy generating portion 33, the upper portion of the space (S) between the vanes 31 is blocked by the bottom of the buoyancy generating portion (33). Lose. Therefore, when the rotor 30 rotates, the bottom surface 33a of the buoyancy generating unit 33 is buoyant by the fluid flowing into the space S between the vanes 31, which causes the rotor 30 to float slightly. .

In addition, since the Hall sensor 51 is disposed close to the upper surface 33c of the buoyancy generator 33 in which the magnet 40 is built, as described above, the facing area with the magnet 40 becomes larger. This makes it possible to detect accurate data.

Next, the operation of the flow sensor configured as described above and its effects will be described.

First, the fluid passing through the fluid line enters the sensor housing 10 through the inlet 12 and continues through the distribution space 11 and then exits again through the outlet 13 into the fluid line. At this time, the fluid passing through the distribution space 11 of the sensor housing 10 is in contact with the vanes 31 of the rotor 30, so that the rotor 30 in which the magnet 40 is installed is proportional to the amount of fluid. Rotate

In addition, the PCB 50 detects the rotation speed of the rotor 30 through the magnet 40 and the hall sensor 51 that rotate together with the rotor 30, and electrically transmits the rotation speed to the controller (not shown) such as a water heater or a boiler. Will be delivered as a signal.

On the other hand, the fluid entering the space between the vanes 31 during the rotation of the rotor 30 generates a buoyancy while also in contact with the bottom surface 33a of the buoyancy generator 33, due to which the rotor 30 slightly rises upward Rotate to the state. This is because the clearance gap G (refer to FIG. 4) of about 0.3 mm is secured between the upper end of the rotating shaft 32 of the rotor 30 and the bottom face of the cap 20 beforehand.

Therefore, even when the rotor 30 rotates at a high speed, its rotation shaft 32 has little frictional resistance with the bottom of the cap 40, so that even if the flow sensor is used for a long time, wear and tear of the rotor shaft 30 may be damaged. This does not occur. In addition, since the rotation of the rotor 30 is made more smoothly, the hall sensor 51 can detect the rotation speed of the rotor 30 more accurately.

As described above in detail, according to the flow sensor according to the present invention, the top end of the rotation shaft of the rotor is arranged to maintain a predetermined gap with the bottom of the cap, the magnet is disposed on the top of the rotation shaft of the rotor to accommodate the distribution space of the sensor housing A buoyancy generating unit having a bottom of a predetermined diameter and a cylindrical side surface is integrally provided to receive buoyancy by a passing fluid. Therefore, the rotor is slightly floated upward while rotating by the buoyancy generating unit, which has the advantage of preventing damage to the rotating shaft while the frictional resistance between the rotating shaft and the cap of the rotor is minimized. In addition, the rotation of the rotor is made more smoothly, there is an effect that can detect the correct data through the Hall sensor.

Claims (3)

A circular distribution space 11 in which a shaft 14 is built up and installed is formed therein, and a sensor housing 10 having an inlet 12 and an outlet 13 facing each other, and a shaft of the distribution space 11 ( 14, the rotary shaft 32 is fitted to the margin and coupled to the rotor 30 is provided with a plurality of vanes 31 to rotate in accordance with the movement of the fluid, and provided in the circumferential direction above the rotary shaft 32 of the rotor 30 In the flow sensor having a magnet 40, the cap 20 is coupled to close the opening of the distribution space 11 and the hall sensor 51 is disposed so as to maintain a constant distance from the magnet 40, The top end of the rotation shaft 32 of the rotor 30 is disposed so that the bottom surface of the cap 20 and a predetermined gap G are maintained. The magnet 40 is accommodated and disposed above the rotating shaft 32 of the rotor 30, and has a buoyancy force having a bottom surface 33a and a cylindrical side surface 33b having a predetermined diameter so as to receive buoyancy by the fluid passing through the circulation space 11. Flow sensor, characterized in that the generator 33 is provided integrally. The method of claim 1, Flow sensor, characterized in that the upper portion of the vanes 31 is formed in the bottom portion of the buoyancy generating portion (33). The method according to claim 1 or 2, The Hall sensor 51 is a flow sensor, characterized in that disposed to face the upper surface (33c) of the buoyancy generating section (33).