KR20090032596A - Apparatus for opening detection and rotating type check valve including the same - Google Patents

Abstract

An opening detection device and a rotary type check valve including the same are provided to evaluate the open angle without a correction process. An opening detection device comprises: a magnetic field detection sensor producing a plurality of sine wave signals with the magnetic field detected from a magnetic material; an open angle output unit(130) producing the opening angle of a valve disc with the sine wave signals outputted from the magnetic field detection sensor; and an operation unit(140) computing the acceleration and opening angle of the valve disc with the sine wave signals.

Description

Opening degree detection device and rotary check valve including the same {APPARATUS FOR OPENING DETECTION AND ROTATING TYPE CHECK VALVE INCLUDING THE SAME}

The present invention relates to a device for non-contact detection of the position of the disk of the rotary check valve, in particular a magnetic resistance element that changes the strength of the magnetic field that changes with the rotation of the ring-shaped or segmented permanent magnet installed inside the rotary check valve Or it relates to a device capable of linearly calculating the opening angle, the opening degree, the angular velocity, the angular acceleration of the valve disc by detecting by the Hall sensor element.

 The rotary check valve is a valve designed to open when the fluid flows in the forward direction and close by the weight of the valve disc when the fluid flows in the reverse direction. In order to prevent the failure of the rotary check valve and to check the adequacy of its function, it is necessary to check whether the valve disc of the rotary check valve is completely opened and closed under the given operating conditions, and diagnose whether the shaking phenomenon causing the rotary check valve occurs. In operation it is necessary to accurately detect the opening of the valve disc.

Conventional rotary check valves have two permanent magnets attached to the outside and one permanent magnet attached to the inside of the valve.

The rotary check valve as described above has a disadvantage in that it is difficult to obtain an output voltage that is linearly proportional to the change in position of the valve disc, and thus, it is difficult to detect an accurate opening degree according to the operation of the valve disc.

In addition, the rotary check valve, which has a permanent magnet attached to the valve disc and a double sensor combined with an accelerometer and a magnetic field sensor, is placed on the valve body. The distance between the magnet and the magnetic field sensor is too far to weaken the magnetic field and the non-linear signal is detected according to the position of the sensor.

In the conventional rotary check valve as described above, the voltage change according to the change in the magnetic field is regarded as a change in the opening angle of the valve disc. Therefore, when the strength of the magnetic field of the permanent magnet is not constant, there is a problem in comparing the results measured periodically after elapse of time. There is this.

In addition, since the relationship between the magnetic field signal and the angle of the valve disc is non-linear, the conventional check valve based on the magnetic field measurement has a problem in that it is necessary to use other means such as an acoustic emission technique in order to know the valve fully open and closed positions. have. In addition, since the relationship between the magnetic field and the opening degree cannot be known in advance, in order to know the absolute opening position of the valve disk during the operation of the valve disk, the relationship between the magnetic field signal and the opening degree must be obtained through a preliminary experiment. In the conventional rotary check valve, since the relationship between the magnetic field signal and the opening angle is not linear, it is difficult to calculate the angular velocity and the angular acceleration at an arbitrary opening position.

The problem to be solved by the present invention is the non-contact detection of the opening angle of the valve disk when the rotary check valve is operated using a permanent magnet or a multi-pole magnetized permanent magnet and a magnetoresistive element or a Hall sensor element radially magnetized The present invention provides an opening degree detection device for calculating an opening degree, an angular velocity, and an angular acceleration of a valve disc using a detected opening angle, and a rotary check valve including the same.

In order to solve the above problems, the present invention provides a magnetic field detection sensor for generating a plurality of sinusoidal signals through a magnetic field detected from a magnetic body; An opening angle calculation unit for calculating an opening angle of a valve disc based on the sinusoidal signals output from the magnetic field detection sensor; And an opening degree calculator configured to calculate an opening degree, an acceleration, and an angular acceleration of the valve disc based on a ratio between the opening angle and the set maximum opening angle.

At this time, the magnetic field detection sensor may include any one pair of a pair of magnetoresistive elements and a pair of Hall sensor elements.

In addition, one magnetoresistive element of the magnetoresistive element pair may be disposed in a radial direction of the magnetic body, and the other magnetoresistive element may be disposed in a 45 ° direction of the radial direction of the magnetic body.

In addition, one Hall sensor element of the pair of Hall sensor elements may be disposed in a direction tangential to the radial direction of the magnetic material, and the other Hall sensor may be disposed in a 90 ° direction of the tangential direction.

In this case, the sinusoidal signals may be output with a 90 ° phase difference from each other.

And an analog-to-digital converter configured to convert the sinusoidal signal into a digital signal.

The magnetic field sensor may include an amplifier configured to amplify the sinusoidal signal; And a magnetic concentrator for increasing the sensitivity of the detected magnetic field from the magnetic body.

And for the technical problem to be solved above, the present invention is a valve body formed with a fluid pipe flowing fluid; A valve disc for opening and closing the fluid pipe; One side is fixed to the valve body, the other side is connected to the valve disk hinge; A magnetic body fixed to one side of the hinge to generate a rotating magnetic field when the hinge rotates; And an opening degree detection device for detecting the opening degree of the valve disc by detecting the rotating magnetic field, wherein the opening degree detection device comprises: a magnetic field detection sensor generating a plurality of sinusoidal signals through the rotating magnetic field; An opening angle calculation unit for calculating an opening angle of the valve disc through the sinusoidal signal; And an opening degree calculation unit for calculating the opening degree of the valve disc through a ratio between the opening angle and the maximum opening angle.

Here, the magnetic material may include a permanent magnet having any one of a ring shape and a segment shape in order to be fixed to the hinge.

The magnetic material may be magnetized in the radial direction.

The magnetic field detection sensor may include at least one pair of magnetoresistive elements and at least one pair of hall sensor elements.

The magnetoresistive element of any one of the magnetoresistive elements arranged in pairs may be disposed in the radial direction of the magnetic body, and the remaining magnetoresistive elements may be disposed in the 45 ° direction of the magnetic direction of the magnetic body.

In this case, the sinusoidal signals may be output with a 90 ° phase difference from each other.

The magnetic field sensor may include an amplifier for amplifying the sinusoidal signal. And a magnetic concentrator for increasing the sensitivity of the detected magnetic field from the magnetic body.

In addition, the magnetic field sensor may be formed adjacent to the magnetic body on the outer upper side of the valve body and the side of the valve body.

The opening degree detection device and the rotary check valve including the same according to the present invention can obtain an output voltage linearly proportional to the opening angle of the valve disc by using a permanent magnet and two magnetic field sensing elements, thereby quantitatively evaluating the opening angle. No calibration is necessary to do this.

Since the opening degree of the valve disc can be detected quantitatively through the opening calculation unit, it is possible to diagnose whether the valve disc is fully opened without a separate means such as an acoustic emission diagnosis device.

Since the output of the opening angle calculation unit is linearly proportional to the opening angle of the valve disc, the valve disc required for the hinge pin wear due to the repeated shaking of the valve disc and the impact applied to the part which comes into contact with the valve disc when the valve disc is opened and closed. The angular velocity and angular acceleration of can be calculated.

By detecting the valve opening angle as the ratio of the outputs of the two magnetic field sensing elements, even when the magnetic field strength of the permanent magnet changes over time, the opening of the valve disc can be detected consistently, allowing the mutual comparison of periodically measured signals. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are not to be interpreted in the ordinary and dictionary sense, and the inventors can appropriately define the concept of terms in order to explain their own invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only exemplary embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

1 is a cross-sectional view showing a rotary check valve including an opening degree detection device according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the upper portion of the rotary check valve shown in Figure 1, Figure 3 1 is a perspective view illustrating a position where a permanent magnet is attached to the rotatable check valve shown in FIG. 1, and FIGS. 4 and 5 are perspective views illustrating examples of a magnetic field sensor.

1 to 5, the rotary check valve according to the present invention includes a valve body 10, a valve disc 20, a hinge 30, a permanent magnet 40, and an opening degree detection device 50. .

Specifically, the valve body 10 is formed with a fluid pipe through which the fluid flows. At a certain point of the valve body 10, a valve disc 20 is formed to prevent the back flow of the fluid.

The valve disk 20 is opened when the fluid flows in the forward direction inside the fluid pipe, and is closed when the fluid flows in the reverse direction to prevent the backflow of the fluid. The valve disc 20 is fixed to the hinge 30 rotatably fitted to one side of the valve body 10.

The hinge 30 is fixed to the valve body 10 by the hinge pin 60 and moves simultaneously with the opening operation and the closing operation of the valve disc 20.

Permanent magnet 40 is fixed to one end of the hinge (30). The permanent magnet 40 uses a magnet magnetized in the radial direction or a magnetic magnet multi-pole magnetized in the radial direction. The permanent magnet 40 may be formed in a ring shape and fixed to the hinge 30. Since the intensity of the magnetic field generated in the permanent magnet 40 is inversely proportional to the distance, it is preferable that the magnetic field is formed of a ferromagnetic material such as cobalt of sodium to detect the magnetic field from the permanent magnet 40. In addition, the permanent magnet 40 may have the same cross-sectional area of the north pole and the south pole so that the same magnetic field is generated.

When the permanent magnet 40 rotates by the rotation of the valve disk 20, a change is generated in the magnetic field. The opening angle of the valve disc 20 can be detected by detecting the change of the magnetic field.

The opening degree detection device 50 may be formed at one side of the valve body 10, or magnetic field detection sensors 91 and 92 may be formed at one side of the valve body 10, and the remaining components may be formed in an external separate device. have. Magnetic field detection sensors 91 and 92 are attached to the valve body 10 of the rotary check valve. As shown in FIG. 4, the magnetic field sensor may include two Hall sensor elements 91 disposed in the radial direction and the tangential direction of the permanent magnet 40. Here, each Hall sensor element 91 is formed to form a 90 ° angle to each other.

In addition, the magnetic field sensing sensor may include two magnetoresistive elements 92 as shown in FIG. 5. At this time, the two magnetoresistive elements 92 are disposed at 45 ° angles to each other. The opening degree detection device 50 will be described in more detail with reference to FIG. 6.

6 is a block diagram illustrating an opening degree detection apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the apparatus for detecting a degree of opening according to an exemplary embodiment of the present invention may include a magnetic field sensor, first and second voltage generators 111 and 112, and first and second analog / digital converters 121 and 122. The opening angle calculation unit 130 and the opening degree calculation unit 140 are included.

Specifically, the magnetic field sensor is attached to the valve body of the rotary check valve. In this case, the magnetic field sensor may include first and second voltage generators 111 and 112. That is, the first and second voltages V1 and V2 in the form of a sine wave are generated in each magnetic field sensor according to the magnetic field. In this case, a phase difference of 90 ° occurs between the first and second voltages V1 and V2.

The first and second voltages V1 and V2 generated by the first and second voltage generators 111 and 112 are applied to the first and second analog / digital converters 121 and 122. The first and second analog / digital converters 121 and 122 digitally convert analog voltages in the form of sinusoidal waves.

The opening angle calculator 130 calculates the opening angle θ through the digitally converted first and second voltages V1 and V2. The opening degree calculator 140 calculates the "opening degree" through a ratio of the opening angle θ calculated by the opening angle calculator 130 to the maximum opening angle θ _max .

Here, the first and second analog / digital change parts 121 and 122, the opening angle calculator 130, and the opening degree calculator 160 may be manufactured in the form of a single chip and embedded in an enclosure.

The principle of operation for such an opening degree detection device will be described with reference to FIGS. 1 and 6.

1 and 6, when fluid starts to flow from the front end of the valve body 10, drag due to flow occurs in the valve disc 20. The valve disc 20 starts to open when this drag exceeds the moment caused by gravity and the moment generated by the friction between the hinge 30 and the hinge pin 60. When the valve disc 20 starts to open, the hinge 30 is connected to the valve disc 20 so that the valve disc 20 and the hinge 30 begin to rotate around the hinge pin 60 and the hinge 30 Ring attached to the permanent magnet 40 is also rotated. On the contrary, when the flow of fluid from the front end of the valve body 10 is blocked, the moment due to the gravity generated by the weight of the valve disk 20 acts to close the valve disk 20. When the valve disc 20 starts to close, the hinge 30 and the annular permanent magnet 40 rotate in the opposite direction when the valve disc 20 starts to open.

At this time, since the magnetic field is changed when the ring-shaped permanent magnet 40 rotates, the magnetic field change amount may be detected by the magnetic field sensor to calculate the opening angle θ of the valve disk 20 that changes with time.

The magnetic field changed by the rotation of the annular permanent magnet 40 may be two Hall sensor elements arranged in a tangential direction to the radial direction of the annular permanent magnet 40 or two magnets disposed in the radial and radial directions 45 °. Measured by a magnetic field sensor with a resistance element. When a rotating magnetic field is generated by the rotation of the annular permanent magnet 40, the magnetic field sensor generates first and second voltages V1 and V2 having a 90 ° out of phase. The first and second voltages V1 and V2 are digitally converted by the first and second analog / digital converters 121 and 122, respectively, and then the opening angle calculation unit 130 calculates the opening angle θ. do.

The opening angle θ may be calculated in the same manner as in Equation (1). In Equation 1, P is a constant determined by the number of poles of the permanent magnet 40 or the direction angles of the two sensor elements.

The inverse tangent function of Equation 1 shows a repetitive pattern with a value within ± (90 / P) ° at an angle exceeding ± (90 / P) °, and the angle obtained by the inverse tangent formula is 0 to 360. In order to convert between °, the opening angle (θ) at which the valve starts to open (the first opening angle is detected) is set to 0 ° so that the current opening angle (θ) at which the valve disc 20 is moved from the fully open position. _p ) is calculated. Since the opening angle calculation method detects the opening angle θ by the ratio of the voltage values output from the two sensor elements, the opening angle θ is consistently detected even if the magnetic field strength of the permanent magnet 40 changes with time. To do it. In addition, by using two magnetic field sensing elements, an output voltage linearly proportional to the opening angle [theta] can be obtained, thereby eliminating the necessary calibration work for quantitatively evaluating the opening angle.

The opening degree calculator 140 calculates the current opening degree of the valve disc 20 using the maximum opening angle θ _max of the valve disc 20 and the current opening angle θ _{p of} the valve disc 20. Calculate as

The opening degree calculation unit 140 calculates the angular velocity and the angular acceleration important for diagnosing the valve by using the opening angle information according to the time change.

On the other hand, the magnetic field detection sensor of the opening degree detection apparatus according to the present invention may include an amplifier (not shown) that can amplify the signal of the Hall sensor element or the magnetoresistive element, in order to increase the sensitivity to the magnetic field magnetic concentrator Means such as (not shown) may be included in the sensor element.

In addition, as shown in FIG. 1, in general, the magnetic field sensor may have a valve body 10 closest to the permanent magnet 40 such that the bottom surface of the magnetic field sensor is perpendicular to a radial center line of the annular permanent magnet 40. It is installed on the outer wall. Here, the magnetic field sensor is attached in parallel to the lower surface of the opening degree detection device 50.

However, when it is difficult to arrange the magnetic field sensor in this position, as shown in Figs. 7 to 9 can be disposed in other positions of the outer wall of the valve body 10.

As shown in FIG. 7, the opening degree detection device 50 having the magnetic field sensor may be installed on the outer wall of the valve body 10 perpendicular to the axis center line of the permanent magnet 40.

As shown in FIG. 8, the opening degree detection device 50 having the magnetic field sensor may be installed at the rear end of the valve body 10 along the radial center line of the permanent magnet 40.

In addition, as shown in FIG. 9, the opening degree detection device 50 having a magnetic field sensor may be disposed on the valve body upper plate 80 so as to be perpendicular to the radial center line of the permanent magnet 40. 7 to 9 are views illustrating an example in which the opening degree detecting device 50 is inserted in parallel with the surface contacting the valve body 10 or the valve body upper plate 80 and the magnetic field sensor. Thus, the magnetic field sensor is disposed perpendicular to the axis center line of the permanent magnet 40, or along the radial center line of the permanent magnet 40.

On the other hand, in the case where it is difficult to detect the strength of the rotating magnetic field generated when the valve disk 20 is operating on the outer wall surface of the valve body 10 is inserted into the valve body 10 or the valve body upper plate 80 to be coupled The threaded portion may be formed in the opening degree detecting device 50 so that the opening may be formed.

10 is a perspective view illustrating a method that can be used when the lateral space of the hinge is small so that the annular permanent magnet cannot be attached thereto.

Referring to FIG. 10, a portion of the annular permanent magnet may be cut to form a segmented permanent magnet 45, and then attached to the hinge 30. As shown in FIG. 10, when the N-pole and S-poles are cut to have the same length of arc, the segmented permanent magnets 45 are manufactured to have the same magnetic field strength. Likewise, the opening angle can be detected.

In general, since the opening angle of the rotary check valve is smaller than 90 °, the opening angle detection can be satisfactorily performed when the arc length of the N pole and the S pole is larger than 90 °. When the segmented permanent magnet 45 is used, the detectable rotation angle is limited, which affects P of Equation 1, and thus this is taken into account when calculating the opening angle. Even when the segmented permanent magnet 45 is installed to detect the rotating magnetic field, the radial or axial central axis of the segmented permanent magnet 45 detects the magnetic field, as described in the description with reference to FIGS. 7 to 9. Install so that it is perpendicular to the bottom of the sensor.

1 is a cross-sectional view showing a rotary check valve including an opening degree detection device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an upper portion of the rotary check valve shown in FIG.

Figure 3 is a perspective view for explaining the position where the permanent magnet is attached to the rotary check valve shown in FIG.

4 and 5 are perspective views showing examples of the magnetic field sensing sensor.

6 is a block diagram schematically illustrating an opening degree detection apparatus according to an exemplary embodiment of the present invention.

7 to 9 are cross-sectional views illustrating the arrangement of magnetic field sensing sensors.

Figure 10 is a perspective view for explaining a rotary check valve in accordance with another embodiment of the present invention.

<Brief Description of Drawings>

10: valve body 20: valve disc

30: hinge 40: ring permanent magnet

45: segmented permanent magnet 50: opening degree detection device

60: hinge pin 80: valve body top plate

91: Hall sensor element 92: Magnetoresistive element

111 and 112: first and second voltage generators

121 and 122: first and second analog / digital converters

130: opening angle calculation unit 140: opening degree calculation unit

Claims (15)

A magnetic field detection sensor generating a plurality of sinusoidal signals through a magnetic field detected from the magnetic body; An opening angle calculation unit for calculating an opening angle of a valve disc based on the sinusoidal signals output from the magnetic field detection sensor; And And an opening degree calculator configured to calculate an opening degree, an acceleration, and an angular acceleration of the valve disc based on a ratio between the opening angle and a set maximum opening angle. The method of claim 1, The magnetic field detection sensor includes a pair of magnetoresistive elements and a pair of Hall sensor elements. The method of claim 2, The magnetoresistive element of one of the magnetoresistive element pairs is disposed in a radial direction of the magnetic body, and the remaining magnetoresistive element is disposed in a 45 ° direction in the radial direction of the magnetic body. The method of claim 2, One of the Hall sensor elements of the pair of Hall sensor elements are arranged in a direction tangential to the radial direction of the magnetic material, the other Hall sensor element is disposed in a 90 ° direction of the tangential direction Device. The method of claim 2, And the sinusoidal signals are output with a 90 ° phase difference from each other. The method of claim 5, wherein And an analog-to-digital converter configured to convert the sinusoidal signals into digital signals. The method of claim 1, The magnetic field sensor includes an amplifier for amplifying the sine wave signal; And And a magnetic concentrator for increasing the sensitivity of the detected magnetic field from the magnetic body. A valve body having a fluid pipe through which a fluid flows; A valve disc for opening and closing the fluid pipe; One side is fixed to the valve body, the other side is connected to the valve disk hinge; A magnetic body fixed to one side of the hinge to generate a rotating magnetic field when the hinge rotates; And an opening degree detecting device for detecting the opening degree of the valve disc by detecting the rotating magnetic field. The opening degree detection device A magnetic field detection sensor generating a plurality of sinusoidal signals through the rotating magnetic field; An opening angle calculation unit for calculating an opening angle of the valve disc through the sinusoidal signal; And And a opening degree calculator configured to calculate the opening degree of the valve disc based on a ratio between the opening angle and the maximum opening angle. The method of claim 8, The magnetic material is Rotating check valve comprising a permanent magnet having any one of a ring shape and a segment shape to be fixed to the hinge. The method of claim 9, The magnetic check valve is characterized in that the magnetized in the radial direction. The method of claim 8, The magnetic field detection sensor A rotary check valve comprising at least one pair of magnetoresistive elements and at least one pair of hall sensor elements. The method of claim 11, One of the magnetoresistive elements arranged in the pair is a magnetoresistive element is disposed in the radial direction of the magnetic body, the remaining magnetoresistive element is disposed in the 45 ° direction of the radial direction of the magnetic body, characterized in that the rotary check valve . The method of claim 11, And the sinusoidal signals are output with a phase difference of 90 ° from each other. The method of claim 13, The magnetic field sensor includes an amplifier for amplifying the sine wave signal; And And a magnetic concentrator for increasing the sensitivity of the detected magnetic field from the magnetic body. The method of claim 8, The magnetic field detection sensor is a rotary check valve, characterized in that formed adjacent to the magnetic body on the outer upper side of the valve body and the side of the valve body.

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