CN216350771U - Low-cost high-precision waterproof digital display tachometer - Google Patents
Low-cost high-precision waterproof digital display tachometer Download PDFInfo
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- CN216350771U CN216350771U CN202123138651.1U CN202123138651U CN216350771U CN 216350771 U CN216350771 U CN 216350771U CN 202123138651 U CN202123138651 U CN 202123138651U CN 216350771 U CN216350771 U CN 216350771U
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Abstract
The utility model discloses a low-cost high-precision waterproof digital display tachometer, which relates to the technical field of tachometers and comprises an installation shell, wherein an installation plate is installed below the interior of the installation shell, a detection structure is arranged at the top end of the installation plate, the detection structure also comprises a single chip microcomputer, the single chip microcomputer is installed on one side of the top end of the installation plate, a timer measurement sensor is arranged at the top end of the single chip microcomputer, a Hall sensor is arranged on one side, far away from the single chip microcomputer, of the top end of the installation plate, and an optocoupler is arranged at the middle position of the top end of the installation plate. The utility model measures the time interval of two adjacent pulses sent by the sensor through the built-in timer, the timer timing interval is set to be one microsecond, and the singlechip calculates the number of the pulses in one minute, thereby further calculating the rotating speed value per minute.
Description
Technical Field
The utility model relates to the technical field of tachometers, in particular to a low-cost high-precision waterproof digital display tachometer.
Background
The digital display tachometer can display the rotating speed of electrical equipment, such as a compressor, a fire pump and the like, but the traditional tachometer suitable for an air compressor and a fire pump set generally adopts a Hall sensor and adopts an inlet chip and a counting principle to calculate the rotating speed of a rotating mechanism. The previous single chip microcomputer collects the number of pulses received within 1 second, and then calculates the rotating speed value per minute, and the algorithm is high in stability but slow in reaction, and has higher waterproof requirements in the use environments of the marine air compressor and the fire pump set.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-cost high-precision waterproof digital display tachometer so as to solve the problems of slow reaction and lack of waterproof function in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: a low-cost high-precision waterproof digital display tachometer comprises an installation shell, wherein an installation plate is installed below the interior of the installation shell, and a detection structure is arranged at the top end of the installation plate;
the detection structure further comprises a single chip microcomputer, the single chip microcomputer is mounted on one side of the top end of the mounting plate, a timer measuring sensor is arranged at the top end of the single chip microcomputer, a Hall sensor is arranged on one side, far away from the single chip microcomputer, of the top end of the mounting plate, and an optical coupler is arranged in the middle of the top end of the mounting plate;
one side of installation shell bottom is provided with power connection, and the top of installation shell installs the roof, the intermediate position department on roof top installs digital display tube, and the top of roof installs the fixed plate, the installation cover is installed on the top of fixed plate, and the internally mounted of installation cover has the protection casing, the top of fixed plate is provided with the draw-in groove, the inside of draw-in groove is provided with waterproof construction.
Preferably, the waterproof structure includes butyronitrile sealing washer, wash port, cotton cover and annular slab absorb water, the butyronitrile sealing washer is installed at the inner wall of fixed plate, and the outside of fixed plate is provided with a plurality of wash ports, the annular slab is installed to the intermediate position department of installation cover bottom, and the cotton cover that absorbs water is installed in the outside of annular slab.
Preferably, one end of the annular plate penetrates through the top end of the clamping groove and extends to the inside of the clamping groove, and the inner wall of the clamping groove is in contact with the outer side of the water absorption cotton sleeve.
Preferably, the drain holes are arranged on the outer side of the fixing plate at equal angles, and one end of the inner part of each drain hole penetrates through one end of the inner part of each clamping groove and is communicated with the clamping groove.
Preferably, the butyronitrile sealing ring is in a ring shape, the outer side of the butyronitrile sealing ring is in contact with the inner wall of the fixing plate, and the butyronitrile sealing ring is arranged under the protective cover.
Preferably, the cross sections of the mounting cover and the fixing plate are both circular rings, and the diameters of the mounting cover and the fixing plate are the same.
Preferably, the shape of protection casing is the ring shape, and the size of protection casing external diameter is the same with installation cover internal diameter size.
Compared with the related technology, the low-cost high-precision waterproof digital display tachometer provided by the utility model has the following beneficial effects:
the utility model provides a device which uses a single chip microcomputer as a main control chip of the device, pulse signals of a Hall sensor are converted into zero to five volt pulse signals after being optically coupled and isolated, and the zero to five volt pulse signals reach the single chip microcomputer, different from the prior art that the single chip microcomputer collects the number of pulses received within one second and then calculates the rotating speed value of each minute, the single chip microcomputer of the tachometer measures the time interval of two adjacent pulses sent by the sensor through a built-in timer, the time interval of the timer is set to be one microsecond, the single chip microcomputer calculates the number of pulses within one minute so as to further calculate the rotating speed value of each minute, although the device still has distortion or jitter due to a microsecond error, aiming at the phenomenon, the tachometer adopts a method of continuously collecting ten data and then taking an average value so that the integral processing time is less than one hundred milliseconds and less than the reaction time of human eyes, thereby eliminating the jitter, by compressing the response time of the meter to within one second of zero, the response time is not noticeable to the naked eye, and the user experience is improved significantly.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic top sectional view of the mounting housing of the present invention;
FIG. 4 is a schematic top view of a fixing plate according to the present invention;
fig. 5 is an enlarged schematic view of the structure at the position a of the present invention.
In the figure: 1. a power supply connector; 2. a single chip microcomputer; 3. a timer measurement sensor; 4. mounting a shell; 5. mounting a plate; 6. a fixing plate; 7. a waterproof structure; 701. a butyronitrile sealing ring; 702. a drain hole; 703. a water-absorbing cotton sleeve; 704. an annular plate; 8. mounting a cover; 9. a digital display tube; 10. a top plate; 11. a protective cover; 12. a Hall sensor; 13. an optical coupler; 14. a clamping groove.
Detailed Description
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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1-5, a low-cost high-precision waterproof digital display tachometer comprises a mounting shell 4, a mounting plate 5 is mounted below the inside of the mounting shell 4, and a detection structure is arranged at the top end of the mounting plate 5;
a power supply connector 1 is arranged on one side of the bottom end of the mounting shell 4, a top plate 10 is mounted at the top end of the mounting shell 4, a digital display tube 9 is mounted in the middle of the top end of the top plate 10, a fixing plate 6 is mounted at the top end of the top plate 10, a mounting cover 8 is mounted at the top end of the fixing plate 6, a protective cover 11 is mounted inside the mounting cover 8, a clamping groove 14 is formed in the top end of the fixing plate 6, and a waterproof structure 7 is arranged inside the clamping groove 14;
the cross sections of the mounting cover 8 and the fixing plate 6 are both circular rings, and the diameters of the mounting cover 8 and the fixing plate 6 are the same;
the protective cover 11 is in a ring shape, and the size of the outer diameter of the protective cover 11 is the same as the size of the inner diameter of the mounting cover 8;
referring to fig. 1-5, the low-cost high-precision waterproof digital display tachometer further comprises a detection structure, the detection structure further comprises a single chip microcomputer 2, the type of the single chip microcomputer 2 can be CH552, the single chip microcomputer 2 is installed on one side of the top end of an installation plate 5, a timer measuring sensor 3 is arranged at the top end of the single chip microcomputer 2, a hall sensor 12 is arranged on one side, away from the single chip microcomputer 2, of the top end of the installation plate 5, an optical coupler 13 is arranged in the middle of the top end of the installation plate 5, and the type of the optical coupler 13 can be PC 817;
specifically, as shown in fig. 1 and 3, a single chip microcomputer 2 is used as a main control chip of the apparatus, and pulse signals of a hall sensor 12 are isolated by an optical coupler 13 and then converted into zero to five volt pulse signals to reach the single chip microcomputer 2, which is different from the previous method in which the single chip microcomputer collects the number of pulses received within one second and then calculates the value of the rotation speed per minute, the single chip microcomputer 2 of the tachometer measures the time interval of two adjacent pulses sent by the sensor 3 by a built-in timer, the timer time interval is set to one microsecond, the single chip microcomputer 2 calculates the number of pulses within one minute, and further calculates the value of the rotation speed per minute, although the apparatus still has distortion or jitter due to one microsecond error, for this phenomenon, the tachometer adopts a method of continuously collecting ten data and then taking an average value, so that the overall processing time is less than one hundred milliseconds, less than the reaction time of the human eye, thereby eliminating jitter.
Example 2: the waterproof structure 7 comprises a butyronitrile sealing ring 701, a plurality of drain holes 702, a water absorption cotton sleeve 703 and an annular plate 704, wherein the butyronitrile sealing ring 701 is arranged on the inner wall of the fixing plate 6, the plurality of drain holes 702 are arranged on the outer side of the fixing plate 6, the annular plate 704 is arranged in the middle of the bottom end of the mounting cover 8, and the water absorption cotton sleeve 703 is arranged on the outer side of the annular plate 704;
one end of the annular plate 704 penetrates through the top end of the clamping groove 14 and extends into the clamping groove 14, and the inner wall of the clamping groove 14 is in contact with the outer side of the water absorption cotton sleeve 703;
the drain holes 702 are arranged on the outer side of the fixing plate 6 at equal angles, and one end inside the drain holes 702 penetrates through one end inside the clamping groove 14 and is communicated with the clamping groove 14;
the butyronitrile sealing ring 701 is annular, the outer side of the butyronitrile sealing ring 701 is in contact with the inner wall of the fixing plate 6, and the butyronitrile sealing ring 701 is arranged right below the protective cover 11;
specifically, as shown in fig. 1, fig. 4 and fig. 5, at first, the protection cover 11 of this device has the transparent surface of certain withstand voltage effect's ya keli, and installation cover 8 and fixed plate 6 are sealed through the high strength screw thread, use stainless steel strake punching press meshing at last, increase the water-proof effects of this device, and this device is still through being provided with butyronitrile sealing washer 701's existence, can play sealed effect to the erection joint department of protection cover 11, and still be provided with the existence of cotton cover 703 that absorbs water, utilize the hydroscopicity of cotton cover 703 that absorbs water and the drainage function of wash port 702, can prevent the invasion of external moisture, through this, alright realize the water-proof effects of this device.
The working principle is as follows: when the device is used, the device is connected with equipment needing to be detected, and then the stability and the efficiency of the device for calculating the rotating speed are improved;
the first innovation point implementation step:
the single chip microcomputer 2 is used as a main control chip of the device, pulse signals of the Hall sensor 12 are isolated by the optical coupler 13 and then converted into 0-5V pulse signals to reach the single chip microcomputer 2, the pulse signals are different from the pulse signals received by the previous single chip microcomputer within one second, and then the rotating speed value per minute is calculated, the single chip microcomputer 2 of the tachometer measures the time interval of two adjacent pulses sent by the sensor 3 through a built-in timer, the timer timing interval is set to be one microsecond, the single chip microcomputer 2 calculates the pulse number within one minute, so that the rotating speed value per minute is further calculated, although the device still generates distortion or jitter due to one microsecond error, aiming at the phenomenon, the tachometer adopts a method of continuously collecting ten data and then averaging, so that the integral processing time is less than one hundred milliseconds and less than the reaction time of human eyes, thereby eliminating jitter;
then in order to enable the device to have better waterproof performance;
the implementation step of the second innovation point:
at first the protection casing 11 of this device has the acrylic transparent surface of certain withstand voltage effect, and installation cover 8 and fixed plate 6 are sealed through the high strength screw thread, mesh with stainless steel strake punching press at last, increase the water-proof effects of this device, and this device is still through being provided with butyronitrile sealing washer 701's existence, can play sealed effect to the erection joint department of protection casing 11, and still be provided with the existence of cotton cover 703 that absorbs water, utilize the hydroscopicity of cotton cover 703 and the drainage function of wash port 702 that absorbs water, can prevent the invasion of external moisture, through this, alright in order to realize the water-proof effects of this device.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a waterproof digital display tachometer of low-cost high accuracy, includes installation shell (4), its characterized in that: an installation plate (5) is installed below the interior of the installation shell (4), and a detection structure is arranged at the top end of the installation plate (5);
the detection structure further comprises a single chip microcomputer (2), the single chip microcomputer (2) is installed on one side of the top end of the installation plate (5), a timer measuring sensor (3) is arranged on the top end of the single chip microcomputer (2), a Hall sensor (12) is arranged on one side, far away from the single chip microcomputer (2), of the top end of the installation plate (5), and an optical coupler (13) is arranged in the middle position of the top end of the installation plate (5);
one side of installing shell (4) bottom is provided with power connection (1), and installs roof (10) on the top of installing shell (4), the intermediate position department on roof (10) top installs digital display tube (9), and the top of roof (10) installs fixed plate (6), install installing cover (8) on the top of fixed plate (6), and the internally mounted of installing cover (8) has protection casing (11), the top of fixed plate (6) is provided with draw-in groove (14), the inside of draw-in groove (14) is provided with waterproof construction (7).
2. The low-cost high-precision waterproof digital display tachometer of claim 1, wherein: waterproof construction (7) include butyronitrile sealing washer (701), wash port (702), cotton cover (703) and annular slab (704) absorb water, the inner wall at fixed plate (6) is installed in butyronitrile sealing washer (701), and the outside of fixed plate (6) is provided with a plurality of wash ports (702), annular slab (704) are installed to the intermediate position department of installation cover (8) bottom, and the cotton cover (703) absorb water is installed in the outside of annular slab (704).
3. The low-cost high-precision waterproof digital display tachometer of claim 2, wherein: one end of the annular plate (704) penetrates through the top end of the clamping groove (14) and extends into the clamping groove (14), and the inner wall of the clamping groove (14) is contacted with the outer side of the water absorption cotton sleeve (703).
4. The low-cost high-precision waterproof digital display tachometer of claim 2, wherein: the drain holes (702) are arranged on the outer side of the fixing plate (6) at equal angles, and one end of the inner part of each drain hole (702) penetrates through one end of the inner part of the clamping groove (14) and is communicated with the clamping groove (14).
5. The low-cost high-precision waterproof digital display tachometer of claim 2, wherein: the shape of butyronitrile sealing washer (701) is the ring shape, and the outside and fixed plate (6) inner wall of butyronitrile sealing washer (701) contact, butyronitrile sealing washer (701) set up under protection casing (11).
6. The low-cost high-precision waterproof digital display tachometer of claim 1, wherein: the cross sections of the mounting cover (8) and the fixing plate (6) are both circular rings, and the diameters of the mounting cover (8) and the fixing plate (6) are the same.
7. The low-cost high-precision waterproof digital display tachometer of claim 1, wherein: the protection cover (11) is in a circular ring shape, and the size of the outer diameter of the protection cover (11) is the same as the size of the inner diameter of the installation cover (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123138651.1U CN216350771U (en) | 2021-12-14 | 2021-12-14 | Low-cost high-precision waterproof digital display tachometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123138651.1U CN216350771U (en) | 2021-12-14 | 2021-12-14 | Low-cost high-precision waterproof digital display tachometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216350771U true CN216350771U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123138651.1U Active CN216350771U (en) | 2021-12-14 | 2021-12-14 | Low-cost high-precision waterproof digital display tachometer |
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| CN (1) | CN216350771U (en) |
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- 2021-12-14 CN CN202123138651.1U patent/CN216350771U/en active Active
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