CN213748604U - Measuring meter - Google Patents

Abstract

The utility model provides a measurement table utensil relates to measurement technical field for the anti magnetic interference ability of solving the measurement table utensil is weak, and the assembly process is complicated, the higher technical problem of cost. The gauge includes: the magnetic ring and the bipolar magnetic switch sensor chip are arranged in an area defined by the inner ring surface of the magnetic ring, and the bipolar magnetic switch sensor chip can distinguish an N pole from an S pole. When the magnetic ring rotates, the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring through the times of sensing the N-pole magnetic field and the S-pole magnetic field of the magnetic ring; and/or the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring by sensing the number of times of conversion between the N-pole magnetic field and the S-pole magnetic field of the magnetic ring. The utility model provides a measurement table utensil is used for improving the anti-magnetic interference ability of measurement table utensil, simplifies the assembly process of measurement table utensil, reduces the cost of measurement table utensil.

Description

Measuring meter

Technical Field

The utility model relates to a measurement technical field especially relates to a measurement table utensil.

Background

The metering gauge is generally used for measuring the flow rate of fluid, and the common metering gauge comprises a shell, a movement, an internal magnetic ring positioned inside the shell, an external magnetic ring positioned outside the shell, a magnetic induction element, a processor, a transmission gear and a metering magnetic steel. The machine core is connected with the inner magnetic ring in a transmission mode, the outer magnetic ring is located in an area defined by the inner ring surface of the inner magnetic ring, the transmission gear is connected with the outer magnetic ring and the metering magnetic steel in a transmission mode, the magnetic induction element is connected with the processor in a signal mode, and the magnetic induction element induces the movement of the metering magnetic steel. When fluid flows in the metering gauge, the fluid drives the machine core to rotate, the machine core pushes the inner magnetic ring to rotate, the inner magnetic ring drives the outer magnetic ring to rotate through a magnetic field between the inner magnetic ring and the outer magnetic ring, the outer magnetic ring drives the metering magnetic steel to move through the transmission gear, the magnetic induction element induces the magnetic field generated by the metering magnetic steel and generates corresponding level information, and the processor obtains corresponding fluid flow according to the level information.

However, the above-mentioned gauge has weak anti-magnetic interference ability, complicated assembling process and high cost.

SUMMERY OF THE UTILITY MODEL

In view of the above, an embodiment of the present invention provides a meter for improving the anti-magnetic interference capability of the meter, simplifying the assembling process of the meter, and reducing the cost of the meter.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

the embodiment of the utility model provides a measurement meter, this measurement meter includes magnetic ring and bipolar magnetic switch sensor chip, bipolar magnetic switch sensor chip is located the region that the interior anchor ring of magnetic ring encloses, bipolar magnetic switch sensor chip can distinguish the N utmost point and the S utmost point;

when the magnetic ring rotates, the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring through the times of sensing the N-pole magnetic field and the S-pole magnetic field of the magnetic ring; and/or the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring by sensing the number of times of conversion between the N pole magnetic field and the S pole magnetic field of the magnetic ring.

The embodiment of the utility model provides a gauge utensil has following advantage:

the embodiment of the utility model provides a measurement table utensil includes the bipolar magnetic switch sensor chip in the region that the magnetic ring and the interior anchor ring that is located the magnetic ring enclose, and the bipolar magnetic switch sensor chip can distinguish the N utmost point and the S utmost point. When the magnetic ring rotates, the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring through the times of sensing the N-pole magnetic field and the S-pole magnetic field of the magnetic ring or the times of sensing the conversion of the N-pole magnetic field and the S-pole magnetic field of the magnetic ring, so that the flow of the fluid is measured. Due to the fact that the volume of the magnetic ring is far larger than that of the magnetic steel, the magnetic field generated by the magnetic ring is correspondingly far larger than that of the magnetic steel, small external magnetic interference can be ignored relative to the magnetic field generated by the magnetic ring, and the change of the magnetic field sensed by the bipolar magnetic switch sensor chip and generated by the external magnetic interference can be ignored, so that the accuracy of the magnetic field sensed by the bipolar magnetic switch sensor chip is improved. And the magnetic ring structure has the function of shielding external magnetic interference, and the bipolar magnetic switch sensor chip is positioned in the area enclosed by the inner ring surface of the magnetic ring, so that the external magnetic interference can be further shielded, and the anti-magnetic interference capability of the metering gauge is improved. Meanwhile, the bipolar magnetic switch sensor chip is arranged to directly sense the magnetic field of the magnetic ring, so that an outer magnetic ring and a transmission gear in the original scheme can be omitted, the assembly process is simplified, and the cost is reduced.

The metrology gauge tool of any preceding claim, wherein the metrology gauge tool further comprises a housing and a support; the housing is provided with an accommodating cavity, the magnetic ring is sleeved on the side wall of the accommodating cavity, and the magnetic ring can rotate relative to the accommodating cavity;

one end of the bracket is arranged in the accommodating cavity, and the bipolar magnetic switch sensor chip is arranged on the bracket.

The metrology gauge tool as described above, wherein the housing is recessed towards the interior of the metrology gauge tool to form a receiving cavity, wherein a sidewall of the receiving cavity comprises at least a non-magnetic material.

The above-mentioned measuring gauge has a cylindrical accommodating cavity, and the axis of the magnetic ring coincides with the axis of the accommodating cavity.

The metering gauge tool comprises a bracket, a first end part, a middle part and a second end part, wherein the first end part, the middle part and the second end part are sequentially connected, and the first end part is arranged in the accommodating cavity;

the first end part is of a prism structure, the middle part and the second end part are of a cylinder structure, the distance from the side edge of the first end part to the central axis of the first end part is smaller than the radius of the middle part, and the radius of the second end part is smaller than the radius of the middle part;

the bipolar magnetic switch sensor chip is arranged on one side, away from the opening of the accommodating cavity, of the first end portion.

The gauge tool as described above, wherein the bracket is provided with a through hole, the through hole includes a first circular hole section and a second circular hole section that are communicated with each other, and a radius of the first circular hole section is smaller than a radius of the second circular hole section;

the first circular hole section passes through the first end portion and a portion of the middle portion, and the second circular hole section passes through the second end portion and another portion of the middle portion.

The measuring gauge tool as described above, wherein the outer peripheral surface of the intermediate portion is provided with a projection, and the projection is provided with a connecting hole;

the shell is provided with a threaded hole, and the connecting hole is connected with the threaded hole through a screw.

The metrology gauge of above, wherein the bipolar magnetic switch sensor chip is disposed on a printed circuit board disposed on the first end;

the surface of the printed circuit board away from the first end portion is less than the radius of the middle portion from the central axis of the first end portion.

The metrology gauge as described above, wherein the printed circuit board is a flexible printed circuit board that is wound around the first end portion.

The metrology gauge of above, wherein the bipolar magnetic switching sensor chip comprises a bipolar tunneling magnetoresistance.

The above-mentioned gauge tool, wherein the inner ring surface of the magnetic ring is provided with four magnetic regions, and the magnetic properties of any two adjacent magnetic regions are opposite.

The metering gauge tool comprises a magnetic ring, a bipolar magnetic switch sensor chip, a magnetic sensor and a magnetic sensor, wherein in the process of rotating the magnetic ring, when the bipolar magnetic switch sensor chip induces an S-pole magnetic field with first preset intensity, the bipolar magnetic switch sensor chip starts to generate a low-level signal; when the bipolar magnetic switch sensor chip senses an N-pole magnetic field with second preset intensity, the bipolar magnetic switch sensor chip starts to generate a high-level signal;

and each time the magnetic ring rotates for one circle, the bipolar magnetic switch sensor chip generates two high level signals and two low level signals, and each high level signal or each low level signal corresponds to the magnetic ring to rotate for 90 degrees.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a meter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a bracket according to an embodiment of the present invention;

fig. 3 is a schematic view of magnetic pole distribution of a magnetic ring in an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a relative position between a magnetic ring and a bipolar magnetic switch sensor chip in a first state according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a relative position between a magnetic ring and a bipolar magnetic switch sensor chip in a second state according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a relative position between a magnetic ring and a bipolar magnetic switch sensor chip in a third state according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a relative position between a magnetic ring and a bipolar magnetic switch sensor chip in a fourth state according to an embodiment of the present invention;

fig. 8 is a time-dependent change diagram of level signals generated by the bipolar magnetic switch sensor chip when the relative positions of the magnetic ring and the bipolar magnetic switch sensor chip in the embodiment of the present invention sequentially and circularly enter the first state, the second state, the third state, and the fourth state.

Description of reference numerals:

1: a housing; 2: an accommodating cavity;

3: a magnetic ring; 4: a support;

41: a first end portion; 42: an intermediate portion;

43: a second end portion; 44: a through hole;

441: a first circular bore section; 442: a second circular bore section;

5: a bipolar magnetic switching sensor chip; 6: a printed circuit board;

7: and (4) protruding.

Detailed Description

When fluid flows in the metering gauge, the fluid drives the machine core to rotate, the machine core pushes the inner magnetic ring to rotate, the inner magnetic ring drives the outer magnetic ring to rotate through a magnetic field between the inner magnetic ring and the outer magnetic ring, the outer magnetic ring drives the metering magnetic steel to move through the transmission gear, the magnetic induction element induces the change of the magnetic field generated by the metering magnetic steel and generates corresponding level information, and the processor obtains corresponding fluid flow according to the level information. However, the volume of the metering magnetic steel is small, the generated magnetic field strength is low, and the small external magnetic interference can cause the magnetic field sensed by the magnetic induction element to generate large change, so that the accuracy of the magnetic field sensed by the magnetic induction element to the metering magnetic steel is influenced, and the metering gauge has weak anti-magnetic interference capability. And the metering gauge needs to be additionally provided with the outer magnetic ring and the transmission gear to convert the rotation of the inner magnetic ring into the motion of the magnetic steel, so that the complexity of the assembly process is increased, and the cost is increased.

To the above problem, the embodiment of the utility model provides a be provided with magnetic ring and bipolar magnetic switch sensor chip, bipolar magnetic switch sensor chip is located the region that the interior anchor ring of magnetic ring encloses, and bipolar magnetic switch sensor chip can distinguish the N utmost point and the S utmost point in magnetic field to when the magnetic ring rotates, obtain the magnetic ring pivoted number of turns through the number of times of sensing the N utmost point magnetic field in magnetic ring magnetic field and S utmost point magnetic field or the number of times of the N utmost point magnetic field and the conversion of S utmost point magnetic field through the induction magnetic ring, thereby measure fluidic flow. Because the volume of the magnetic ring is far larger than that of the magnetic steel, the magnetic field generated by the magnetic ring is correspondingly far larger than that of the magnetic steel, the smaller external magnetic interference can be ignored relative to the magnetic field generated by the magnetic ring, and the change of the magnetic field sensed by the bipolar magnetic switch sensor chip caused by the external magnetic interference can be ignored, so that the accuracy of the magnetic field sensed by the bipolar magnetic switch sensor chip is improved. And the magnetic ring structure has the function of shielding external magnetic interference, and the bipolar magnetic switch sensor chip is positioned in the area enclosed by the inner ring surface of the magnetic ring, so that the external magnetic interference can be further shielded, and the anti-magnetic interference capability of the metering gauge is improved. Meanwhile, the bipolar magnetic switch sensor chip is arranged to directly sense the magnetic field of the magnetic ring, so that an outer magnetic ring and a transmission gear in the original scheme can be omitted, the assembly process is simplified, and the cost is reduced.

In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, the embodiment of the present invention provides a meter instrument, which includes a magnetic ring 3 and a bipolar magnetic switch sensor chip 5, wherein the bipolar magnetic switch sensor chip 5 is located in an area enclosed by an inner annular surface of the magnetic ring 3, and the bipolar magnetic switch sensor chip 5 can distinguish between an N pole and an S pole of a magnetic field.

When the magnetic ring 3 rotates, the bipolar magnetic switch sensor chip 5 obtains the number of turns of the magnetic ring 3 by sensing the number of times of the N-pole magnetic field and the S-pole magnetic field of the magnetic ring 3, and/or the bipolar magnetic switch sensor chip 5 obtains the number of turns of the magnetic ring 3 by sensing the number of times of the conversion of the N-pole magnetic field and the S-pole magnetic field of the magnetic ring 3.

By the arrangement, when the magnetic ring 3 rotates, the polarity of the magnetic field of the magnetic ring 3 sensed by the bipolar magnetic switch sensor chip 5 at the position of the bipolar magnetic switch sensor chip 5 is changed alternately, and the number of rotating circles of the magnetic ring 3 can be obtained by the bipolar magnetic switch sensor chip 5 through the times of sensing the N-pole magnetic field and the S-pole magnetic field of the magnetic ring 3 and/or the times of converting the N-pole magnetic field and the S-pole magnetic field of the magnetic ring 3, so that the flow of fluid is metered. Because the volume of the magnetic ring 3 is far larger than that of the magnetic steel, the magnetic field generated by the magnetic ring 3 is correspondingly far larger than that of the magnetic steel, the smaller external magnetic interference can be ignored relative to the magnetic field generated by the magnetic ring 3, and the change of the magnetic field induced by the bipolar magnetic switch sensor chip 5 due to the external magnetic interference can be ignored, so that the accuracy of the magnetic field induced by the bipolar magnetic switch sensor chip 5 is improved. And the structure of the magnetic ring 3 has the function of shielding external magnetic interference, and the bipolar magnetic switch sensor chip 5 is positioned in the area enclosed by the inner ring surface of the magnetic ring 3, so that the external magnetic interference can be further shielded, and the anti-magnetic interference capability of the metering gauge is improved. Meanwhile, the bipolar magnetic switch sensor chip 5 is arranged to directly sense the magnetic field of the magnetic ring 3, so that an outer magnetic ring and a transmission gear in the original scheme can be omitted, the assembly process is simplified, and the cost is reduced.

In a specific embodiment, the bipolar magnetic switch sensor chip 5 includes a bipolar tunnel magnetic resistance, which can change its resistance according to the magnitude and direction of the magnetic field, so that the bipolar magnetic switch sensor chip 5 can regulate the generated level signal according to the change of the magnetic field. The bipolar magnetic switching sensor chip 5 is capable of distinguishing the N-pole from the S-pole of the magnetic field. When the bipolar magnetic switch sensor chip 5 induces an N-pole magnetic field with a second preset intensity, the bipolar magnetic switch sensor chip 5 starts to generate a high-level signal; when the bipolar magnetic switch sensor chip 5 senses the S-pole magnetic field of the first preset intensity, the bipolar magnetic switch sensor chip 5 starts to generate a low level signal. The first preset intensity and the second preset intensity are determined by factors such as the sensitivity of the bipolar magnetic switch sensor chip 5.

Furthermore, the measuring meter further comprises a shell 1 and a support 4, the shell 1 is provided with an accommodating cavity 2, the magnetic ring 3 is sleeved on the side wall of the accommodating cavity 2, and the magnetic ring 3 can rotate relative to the accommodating cavity 2. One end of the bracket 4 is arranged in the accommodating cavity 2, and the bipolar magnetic switch sensor chip 5 is arranged on the bracket 4. Set up like this for bipolar magnetic switch sensor chip 5 is located holding chamber 2, can be through holding chamber 2 further shielding external magnetic interference.

In a possible embodiment, a movement is arranged in the meter, and the movement is in transmission connection with the magnetic ring 3. When fluid flows through the inside of the metering gauge, the fluid can drive the movement to rotate, and the movement drives the magnetic ring 3 to rotate when rotating. Therefore, the number of turns of the magnetic ring 3 can represent the flow of the fluid, and the rotating speed of the magnetic ring 3 can represent the flow rate of the fluid.

One end of the support 4 is arranged in the accommodating cavity 2, the bipolar magnetic switch sensor chip 5 is arranged on the support 4, the bipolar magnetic switch sensor chip 5 is located in an area defined by the inner annular surface of the magnetic ring 3, and the bipolar magnetic switch sensor chip 5 is used for sensing a magnetic field generated by the magnetic ring 3.

When the magnetic ring 3 rotates, the magnetic field generated by the magnetic ring 3 correspondingly rotates, the bipolar magnetic switch sensor chip 5 induces the magnetic field generated by the magnetic ring 3, corresponding level information is generated through the change of information such as the size, the direction and the like of the induced magnetic field, and finally the processor in the metering gauge calculates the flow of corresponding fluid according to the level information generated by the bipolar magnetic switch sensor chip 5.

In this way, since the magnetic field intensity generated by the magnetic ring 3 is larger than that generated by the magnetic steel in a common metering gauge, the magnetic field generated by the magnetic ring 3 is less influenced than that generated by the magnetic steel under the same magnetic interference condition. When the bipolar magnetic switch sensor chip 5 directly induces the magnetic field generated by the magnetic ring 3, the interference of the magnetic field induced by the bipolar magnetic switch sensor chip 5 can be reduced, so that the precision of the magnetic field induced by the bipolar magnetic switch sensor chip 5 is improved, and the anti-magnetic interference capability of the metering gauge is improved. And the magnetic ring 3 has the capability of shielding external magnetic interference, and the bipolar magnetic switch sensor chip 5 is positioned in the area enclosed by the inner ring surface of the magnetic ring 3, so that the influence of the external magnetic interference on the bipolar magnetic switch sensor chip 5 can be further reduced, and the anti-magnetic interference capability of the metering gauge is improved. Meanwhile, the bipolar magnetic switch sensor chip 5 is arranged to directly sense the magnetic field of the magnetic ring 3, so that an outer magnetic ring and a transmission gear in the original scheme can be omitted, the assembly process is simplified, and the cost is reduced.

Because the embodiment of the utility model provides an anti magnetic interference ability of measurement table utensil has strengthened, consequently when magnetic interference exists, this measurement table utensil can normally work.

Further, in order to enable the bipolar magnetic switch sensor chip 5 to sense the change of the magnetic field generated by the magnetic ring 3, the bipolar magnetic switch sensor chip 5 may be disposed at a position deviating from the axis of the magnetic ring 3, so as to avoid the situation that the magnetic field at the bipolar magnetic switch sensor chip 5 does not change when the magnetic ring 3 rotates.

As shown in fig. 1, the measurement meter provided by the embodiment of the present invention includes a housing 1, the housing 1 forms a receiving cavity 2 toward the inside of the measurement meter, and a sidewall of the receiving cavity 2 at least includes a non-magnetic material. By the arrangement, the side wall can be prevented from being magnetized under the action of the magnetic field of the magnetic ring 3, and the induction of the bipolar magnetic switch sensor chip 5 to the magnetic field of the magnetic ring 3 is interfered, so that the metering accuracy of the metering gauge is improved.

The side wall of the accommodating cavity 2 is sleeved with a magnetic ring 3, the magnetic ring 3 is positioned in the metering gauge, and when fluid flows through the metering gauge, the magnetic ring 3 rotates in the metering gauge relative to the accommodating cavity 2. By the arrangement, the magnetic ring 3 is positioned in the metering gauge, the magnetic ring 3 converts the flow information of the fluid into the rotation of the magnetic ring 3 in the metering gauge, and the flow information is transmitted to the bipolar magnetic switch sensor chip 5 positioned outside the metering gauge through the magnetic field generated by the magnetic ring 3, so that the information transmission between the inside and the outside of the metering gauge is carried out without arranging through holes on the shell 1, and the sealing performance of the metering gauge is improved. The inside and the outside of the gauge tool are here separated by a housing 1.

The accommodating cavity 2 may be in different shapes such as a cylinder shape and a prism shape, and the specific situation is selected according to actual needs, for example, in this embodiment, the accommodating cavity 2 is in a cylinder shape, and the axis of the magnetic ring 3 coincides with the axis of the accommodating cavity 2. The arrangement is beneficial to the rotation of the magnetic ring 3 relative to the accommodating cavity 2.

The magnetic ring 3 at least comprises a pair of magnetic poles, that is, the magnetic ring 3 may comprise a pair of magnetic poles or a plurality of pairs of magnetic poles, and the specific number may be designed according to the size of the magnetic ring 3. The more the magnetic ring 3 comprises the more pairs of magnetic poles, the higher the accuracy of the gauge. The bipolar magnetic switch sensor chip can distinguish between the N pole and the S pole. The more the magnetic poles in the magnetic ring 3 are, the denser the magnetic poles are distributed along the inner ring surface of the magnetic ring 3, and when the magnetic ring 3 rotates by a small angle, the bipolar magnetic switch sensor chip can sense the conversion between the south magnetic pole and the north magnetic pole, namely, the minimum rotating angle of the magnetic ring 3 can be distinguished by the bipolar magnetic switch sensor chip, so that the metering instrument can more accurately distinguish the rotating angle of the magnetic ring 3, and the accuracy of the metering instrument is further improved.

In a specific embodiment, the inner annular surface of the magnetic ring 3 is provided with four magnetic regions, and the magnetism of any two adjacent magnetic regions is opposite. As shown in fig. 3, the magnetic ring 3 includes two pairs of four magnetic poles, the four magnetic poles form two N-pole magnetic regions and two S-pole magnetic regions on the inner annular surface of the magnetic ring 3, and the magnetic induction lines are emitted from the two N-pole magnetic regions and enter the two S-pole magnetic regions to form the magnetic field shown in fig. 3. When the number of the magnetic areas on the inner ring surface of the magnetic ring 3 is small, the bipolar magnetic switch sensor chip 5 can distinguish that the minimum angle of rotation of the magnetic ring 3 is large, and the accuracy of the metering gauge is low; when the number of the magnetic regions arranged on the inner ring surface of the magnetic ring 3 is large, the size of the magnetic ring 3 is large and the cost for producing the magnetic ring 3 is high. Therefore, the inner ring surface of the magnetic ring 3 comprises four magnetic areas, which can not only meet the accuracy requirement of the metering gauge, but also reduce the size and the production cost of the magnetic ring 3.

Furthermore, the four magnetic poles are uniformly distributed along the inner ring surface of the magnetic ring 3. By the arrangement, the magnetic field in the area surrounded by the inner ring surface of the magnetic ring 3 can be symmetrically distributed along the axis of the magnetic ring 3, so that the change of the magnetic field generated by the bipolar magnetic switch sensor chip 5 sensing the magnetic ring 3 is more uniform, a level signal with more regularity is generated, and the difficulty of processing the level signal by the processor of the metering gauge is reduced.

As shown in fig. 1 and fig. 2, the measurement meter provided by the embodiment of the present invention further includes a bracket 4, the bracket 4 includes a first end portion 41, an intermediate portion 42 and a second end portion 43 which are connected in sequence, and the first end portion 41 is disposed in the accommodating chamber 2. The support 4 can be fixed on the shell 1 by riveting, bolt connection, screw connection, clamping and the like, and the specific situation can be selected according to actual needs. For example, in the present embodiment, the outer peripheral surface of the intermediate portion 42 is provided with a boss 7, the boss 7 is provided with a coupling hole, the housing 1 is provided with a screw hole, and the coupling hole and the screw hole are coupled by a screw to fix the holder 4 to the housing 1.

The first end portion 41, the middle portion 42 and the second end portion 43 may be in different structures such as a cylinder, a prism, etc., and the specific situation is selected according to actual needs. For example, in the present embodiment, the first end portion 41 has a prism structure, the middle portion 42 and the second end portion 43 have a cylindrical structure, the distance from the side edge of the first end portion 41 to the central axis of the first end portion 41 is smaller than the radius of the middle portion 42, and the radius of the second end portion 43 is smaller than the radius of the middle portion 42.

Thus, the installation and fixation of the bipolar magnetic switch sensor chip 5 are facilitated. For example, when the bipolar magnetic switching sensor chip 5 is disposed at the first end portion 41 through the printed circuit board 6, since the first end portion 41 is prism-shaped, the side wall of the first end portion 41 is flat, and the mounting of the printed circuit board 6 is facilitated. And because the distance from the side edge of the first end portion 41 to the central axis of the first end portion 41 is smaller than the radius of the middle portion 42, when the printed circuit board 6 is installed, one end of the printed circuit board 6 can be abutted against the middle portion 42, and the printed circuit board 6 is convenient to position and fix. The radius of the second end portion 43 is smaller than that of the middle portion 42, so that the material consumption of the second end portion 43 can be reduced, and the cost is saved.

Further, the bipolar magnetic switching sensor chip 5 is disposed on a side of the first end portion 41 away from the opening of the accommodation chamber 2. By the arrangement, the bipolar magnetic switch sensor chip 5 can be far away from the opening of the accommodating cavity 2, and the shielding effect on an external magnetic field is enhanced.

The bracket 4 is provided with a through hole 44, the through hole 44 includes a first circular hole section 441 and a second circular hole section 442 which are communicated with each other, the radius of the first circular hole section 441 is smaller than that of the second circular hole section 442, the first circular hole section 441 passes through the first end portion 41 and a part of the middle portion 42, and the second circular hole section 442 passes through the second end portion 43 and another part of the middle portion 42.

By providing the through hole 44, the weight of the bracket 4 can be reduced, thereby reducing the load on the case 1 and improving the structural stability of the meter gauge. Meanwhile, the material consumption of the bracket 4 can be reduced, and the cost is reduced. And by setting the sizes and positions of the first circular hole section 441 and the second circular hole section 442, the through hole 44 can be more matched with the structure of the bracket 4, and the structural stability of the bracket 4 is improved.

A bipolar magnetic switch sensor chip 5 is arranged at the first end 41 of the bracket 4, the bipolar magnetic switch sensor chip 5 is located in an area enclosed by the inner annular surface of the magnetic ring 3, and the bipolar magnetic switch sensor chip 5 is used for sensing the magnetic field generated by the magnetic ring 3. Specifically, when the magnetic ring 3 rotates, the magnetic field generated by the magnetic ring 3 correspondingly rotates, the polarity of the magnetic field at the position where the bipolar magnetic switch sensor chip 5 is located correspondingly switches between the N pole and the S pole, and when the bipolar magnetic switch sensor chip senses the N pole magnetic field with the second preset intensity, the bipolar magnetic switch sensor chip 5 starts to generate a high level signal; when the bipolar magnetic switch sensor chip 5 senses the S-pole magnetic field of the first preset intensity, the bipolar magnetic switch sensor chip 5 starts to generate a low level signal. According to the number of times of the high and low level signal changes, the number of turns of the magnetic ring 3 can be obtained, and therefore the flow rate of the fluid can be obtained. The first preset intensity and the second preset intensity are determined by factors such as the sensitivity of the bipolar magnetic switch sensor chip 5.

In a possible embodiment, the bipolar magnetic switching sensor chip 5 is arranged on a printed circuit board 6, the printed circuit board 6 being arranged at the first end 41 of the holder 4. By the arrangement, compared with the situation that the bipolar magnetic switch sensor chip 5 is directly arranged on the bracket 4, the damage to the bipolar magnetic switch sensor chip 5 in the installation process can be reduced; furthermore, the meter has further electronic components in addition to the bipolar magnetic switching sensor chip 5, which can also be arranged on the printed circuit board 6. The arrangement can also improve the integration level of electronic elements in the measuring meter, and is convenient for wiring the electronic elements.

The surface of the printed circuit board 6 remote from the first end portion 41 has a distance to the central axis of the first end portion 41 that is smaller than the radius of the intermediate portion 42. With this arrangement, when a part of the middle portion 42 is also disposed in the accommodating chamber 2, the printed circuit board 6 can be prevented from colliding with the side wall of the accommodating chamber 2 to some extent, and the structure of the printed circuit board 6 can be protected.

Further, the printed circuit board 6 may be a flexible printed circuit board, and the flexible printed circuit board is wound on the first end portion 41. The flexible printed circuit board has good bending property and high softness, and can improve the structural stability of the metering gauge.

The number of the bipolar magnetic switch sensor chips 5 can be 1, 2, 3, 4, 5 and the like, the specific number can be selected according to the size of the magnetic ring 3, and when the number of the bipolar magnetic switch sensor chips 5 is more than 2, the metering gauge can obtain the rotation direction of the magnetic ring 3 according to the sequence of level signals generated by the plurality of bipolar magnetic switch sensor chips 5, so that the flow direction of fluid can be obtained.

When the magnetic ring 3 rotates clockwise, the relative positions of the magnetic ring 3 and the bipolar magnetic switch sensor chip sequentially circulate to a first state shown in fig. 4, a second state shown in fig. 5, a third state shown in fig. 6, and a fourth state shown in fig. 7. When the magnetic ring 3 and the bipolar magnetic switch sensor chip are in a first state, the bipolar magnetic switch sensor chip is close to an N pole, the bipolar magnetic switch sensor chip senses an N pole magnetic field with a second preset intensity, and the bipolar magnetic switch sensor chip starts to generate a high level signal; when the magnetic ring 3 and the bipolar magnetic switch sensor chip are in a second state, the bipolar magnetic switch sensor chip is close to an S pole, the bipolar magnetic switch sensor chip senses an S pole magnetic field with first preset intensity, and the bipolar magnetic switch sensor chip starts to generate a low level signal; when the magnetic ring 3 and the bipolar magnetic switch sensor chip are in a third state, the bipolar magnetic switch sensor chip approaches the N pole again, the bipolar magnetic switch sensor chip senses an N pole magnetic field with second preset intensity, and the bipolar magnetic switch sensor chip starts to generate a high level signal again; when the magnetic ring 3 and the bipolar magnetic switch sensor chip are in the fourth state, the bipolar magnetic switch sensor chip is close to the S pole again, the bipolar magnetic switch sensor chip senses the S pole magnetic field with the first preset intensity, and the bipolar magnetic switch sensor chip starts to generate low level signals again.

In the above process, the bipolar magnetic switching sensor chip generates a level signal as shown in fig. 8, which includes a high level signal and a low level signal alternately appearing. Every time the magnetic ring 3 rotates for a circle, the bipolar magnetic switch sensor chip generates two high level signals and two low level signals, each high level signal or each low level signal corresponds to the magnetic ring 3 and rotates for 90 degrees, and a processor in the metering gauge can calculate the specific number of turns of the magnetic ring 3 through the level signals.

Because the bipolar magnetic switch sensor chip can distinguish the N pole and the S pole of a magnetic field, no matter whether the magnetic interference is enhanced by the magnetic field near the S pole or the magnetic field near the N pole, the bipolar magnetic switch sensor chip can change the state of a level signal generated by the bipolar magnetic switch sensor chip when the bipolar magnetic switch sensor chip is close to the S pole or the N pole, namely, the conversion between a high level signal and a low level signal generated by the bipolar magnetic switch sensor chip is realized, so that the metering gauge can distinguish the number of turns of the magnetic ring 3, and the anti-magnetic interference capability of the metering gauge is improved.

In a related scheme, if a bipolar magnetic switch sensor chip is used as a magnetic induction element, a magnetic field of magnetic steel is induced by the bipolar magnetic switch sensor chip, when the magnetic steel rotates, a single S pole or N pole always faces the bipolar magnetic switch sensor chip, so that the magnetic field induced by the bipolar magnetic switch sensor chip is always a single S pole magnetic field or N pole magnetic field, and the bipolar magnetic switch sensor chip can only generate a single high level signal or low level signal, which cannot meet the metering requirement of a metering gauge.

Therefore, two pieces of magnetic steel are usually adopted, so that the S pole of one piece of magnetic steel faces the bipolar magnetic switch sensor chip, and the N pole of the other piece of magnetic steel faces the bipolar magnetic switch sensor chip. Therefore, the bipolar magnetic switch sensor chip can alternately induce an S-pole magnetic field and an N-pole magnetic field to generate high-level signals and low-level signals which are alternately changed.

And the embodiment of the utility model provides a make 5 magnetic fields of response magnetic ring 3 of bipolar magnetic switch sensor chip, only need with the bipolar magnetic switch sensor chip 5 insert the interior anchor ring of magnetic ring 3 enclose the region can, need not to distinguish north and south magnetic pole, further simplified the installation.

The embodiment of the utility model provides a measurement table utensil can be directly through reforming transform the measurement table utensil such as diaphragm type gas table, water gauge and obtain. Use diaphragm type gas table as example, through getting rid of the outside outer magnetic ring in holding chamber 2 outside, measurement gear and magnet steel, it is fixed with bipolar magnetic switch sensor chip 5 through support 4, make the inside kinetic energy transmission magnetic ring of bipolar magnetic switch sensor chip 5 response diaphragm type gas table produce the magnetic field, can accomplish and reform transform, obtain the utility model provides a measurement table utensil.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

In the description of the present specification, references to "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (12)

1. A metering gauge is characterized by comprising a magnetic ring and a bipolar magnetic switch sensor chip, wherein the bipolar magnetic switch sensor chip is positioned in an area defined by the inner ring surface of the magnetic ring and can distinguish an N pole from an S pole;

when the magnetic ring rotates, the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring through the times of sensing the N-pole magnetic field and the S-pole magnetic field of the magnetic ring; and/or the bipolar magnetic switch sensor chip obtains the number of turns of the magnetic ring by sensing the number of times of conversion between the N pole magnetic field and the S pole magnetic field of the magnetic ring.

2. The metrology gauge of claim 1, further comprising a housing and a support; the housing is provided with an accommodating cavity, the magnetic ring is sleeved on the side wall of the accommodating cavity, and the magnetic ring can rotate relative to the accommodating cavity;

one end of the bracket is arranged in the accommodating cavity, and the bipolar magnetic switch sensor chip is arranged on the bracket.

3. The metrology gauge of claim 2, wherein the housing is recessed toward an interior of the metrology gauge to form a receiving cavity, a sidewall of the receiving cavity comprising at least a non-magnetic material.

4. A meter gauge according to claim 2 or 3, wherein the housing chamber is cylindrical and the axis of the magnet ring coincides with the axis of the housing chamber.

5. The metrology gauge of claim 3, wherein the frame comprises a first end portion, an intermediate portion, and a second end portion connected in series, the first end portion disposed within the receiving cavity;

the first end part is of a prism structure, the middle part and the second end part are of a cylinder structure, the distance from the side edge of the first end part to the central axis of the first end part is smaller than the radius of the middle part, and the radius of the second end part is smaller than the radius of the middle part;

the bipolar magnetic switch sensor chip is arranged on one side, away from the opening of the accommodating cavity, of the first end portion.

6. The metrology gauge of claim 5 wherein said support is provided with a through bore comprising a first circular bore section and a second circular bore section in communication, said first circular bore section having a smaller radius than said second circular bore section;

the first circular hole section passes through the first end portion and a portion of the middle portion, and the second circular hole section passes through the second end portion and another portion of the middle portion.

7. The measurement gauge of claim 6, wherein the intermediate portion has a projection formed on an outer peripheral surface thereof, the projection having a connection hole formed therein;

the shell is provided with a threaded hole, and the connecting hole is connected with the threaded hole through a screw.

8. The metrology gauge of any of claims 5-7, wherein the bipolar magnetic switch sensor chip is disposed on a printed circuit board disposed on the first end portion;

the surface of the printed circuit board away from the first end portion is less than the radius of the middle portion from the central axis of the first end portion.

9. The metrology gauge of claim 8, wherein said printed circuit board is a flexible printed circuit board, said flexible printed circuit board being disposed around said first end portion.

10. The metrology gauge of claim 1, wherein the bipolar magnetic switching sensor chip comprises a bipolar tunneling magnetoresistance.

11. The metrology gauge of claim 1, wherein the inner annular surface of the magnetic ring has four magnetic regions, any two adjacent magnetic regions being of opposite magnetic polarity.

12. The metrology gauge of claim 11, wherein during rotation of the magnetic ring, the bi-polar magnetic switch sensor chip begins to generate a low level signal when the bi-polar magnetic switch sensor chip senses an S-polar magnetic field of a first predetermined strength; when the bipolar magnetic switch sensor chip senses an N-pole magnetic field with second preset intensity, the bipolar magnetic switch sensor chip starts to generate a high-level signal;

and each time the magnetic ring rotates for one circle, the bipolar magnetic switch sensor chip generates two high level signals and two low level signals, and each high level signal or each low level signal corresponds to the magnetic ring to rotate for 90 degrees.

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