CN116558582A - Flowmeter and flow detection device - Google Patents

Abstract

The application discloses a flowmeter and a flow detection device, wherein the flowmeter comprises an assembly main body, a circuit board and a packaging piece, wherein the assembly main body is provided with an assembly groove; the circuit board is arranged in the assembly groove and provided with a coding area; the packaging piece is arranged in the assembly groove and can seal and package the circuit board in the assembly groove; the package is at least partially a light-transmitting area, and the light-transmitting area corresponds to the coding area. The embodiment of the application can protect the circuit board through the packaging part and can observe the coding area through the light-transmitting area on the packaging part.

Description

Flowmeter and flow detection device

Technical Field

The application relates to the technical field of meters, in particular to a flowmeter and a flow detection device.

Background

In the relevant art, flow metering is one of the components of metering science and technology. The flowmeter comprises a connecting pipe, a detection component and a display component, wherein the connecting pipe can be connected to a pipeline to be detected, the detection component at least partially stretches into the connecting pipe to detect the flow of fluid in the connecting pipe, the detection component can specifically comprise a flow amplifier, the display component is connected with the detection component and is provided with a display screen and a circuit board electrically connected with the display screen, the flow amplifier is also electrically connected with the circuit board, and the flow of fluid detected by the flow amplifier can be checked through the display screen. The circuit board of flowmeter has the coding region, is provided with the discernment code on the coding region, when carrying out the discernment of leaving the factory for instance the flowmeter at some times, need look over the discernment code on the circuit board, however, the circuit board is installed inside the flowmeter, and the regional degree of difficulty of looking over of coding is great.

Disclosure of Invention

The embodiment of the application provides a flowmeter and a flow detection device, which can protect a circuit board through a packaging piece and can observe a coding area through a light transmission area on the packaging piece.

In a first aspect, embodiments of the present application provide a flow meter including a mounting body having a mounting slot, a circuit board, a package, a light source, and a photosensitive switch element; the circuit board is arranged in the assembly groove and provided with a coding area; the packaging piece is arranged in the assembly groove and can seal and package the circuit board in the assembly groove; the light source piece is connected with the packaging piece and is used for emitting light rays, and the emitted light rays at least irradiate the coding area; the photosensitive switch element is electrically connected with the circuit board and the light source piece, and when the photosensitive switch element is triggered, the circuit board is communicated with the light source piece, the packaging piece and the assembly groove are exposed, wherein the packaging piece is at least partially a light-transmitting area, and the light-transmitting area corresponds to the coding area.

Based on the embodiment of the application, the assembly main body can bear a circuit board and a packaging piece, various components such as a processor and a memory are arranged on the circuit board, the circuit board can be electrically connected with the light source piece through the photosensitive switch element and electrically connected with each component of the control flowmeter, for example, each component comprises a flow amplifier and a display, and the circuit board can control the working state of the flow amplifier and also can control and adjust the display state of the display. The packaging piece can encapsulate the assembly groove, and after the circuit board is installed in the assembly groove, the circuit board can be packaged and protected through the packaging piece, and the packaging piece can specifically seal the circuit board in the assembly groove. The encapsulation piece can have the printing opacity region, perhaps whole encapsulation piece is transparent structure, have the coding region on the circuit board, have corresponding discernment code on the coding region, after encapsulation piece encapsulation circuit board, when photosensitive switch element received illumination, photosensitive switch element touched in order to switch on circuit board and light source spare, the circuit board passes through the electric energy to the light source spare so that light source spare outgoing light, and the light that the light source spare was emergent shines to the coding region, so that the user can be more clear through the discernment code of the coding region of observing through the printing opacity region on the encapsulation piece when protecting the circuit board, the embodiment of this application can observe the coding region through the printing opacity region on the encapsulation piece.

In some embodiments of the present application, the light guide assembly further comprises a housing, a light guide assembly and a cover plate, wherein the housing is provided with a containing cavity and a viewing hole communicated with the containing cavity, and the assembly main body is arranged in the containing cavity; the light guide assembly is positioned in the shell, the first end of the light guide assembly faces the light transmission area and is arranged above the light transmission area, or the first end of the light guide assembly is connected to the light transmission area; the second end of the light guide assembly is connected to the shell and communicated with the observation hole, and the observation hole can be used for observing the coding region of the circuit board; the cover plate is movably connected with the shell, and is provided with a first position for covering the observation hole and a second position for opening the observation hole.

In some embodiments, the package includes a sealing part and a perspective part, the sealing part is fixedly connected to the side wall or the bottom wall of the assembly groove at the periphery side, the sealing part covers the circuit board, the sealing part is in sealing connection with the connection position of the assembly groove, and the sealing part is provided with a containing cavity for containing the light source part; the perspective part is arranged in the middle of the sealing part, the arrangement position of the perspective part is opposite to the coding region, the light transmission region is arranged on the perspective part, and the accommodating cavity extends to the interface between the perspective part and the sealing part.

In some embodiments, the light guide assembly includes a convex lens mounted on the light transmissive region of the package or on the viewing aperture.

In some embodiments, the light guide assembly further comprises at least one mirror capable of changing the light guide path of the light guide assembly.

In some embodiments, the two reflectors are provided, including a first reflector and a second reflector which are opposite and arranged in parallel, the first reflector is arranged obliquely relative to the coding region, and the reflecting surface of the first reflector faces the coding region; the second reflector is obliquely arranged relative to the observation hole, and the reflecting surface of the second reflector faces the observation hole.

In some embodiments, a light source member is disposed at one side of the coding region, or a light source member is disposed below the coding region; the light source member is capable of illuminating the encoded region.

In some embodiments, the package is a fully transparent structure, and the package is packaged and solidified by transparent colloid and then molded; or, the packaging piece is a transparent plate, and the transparent plate is used for fixing and sealing the notch of the assembly groove.

In a second aspect, embodiments of the present application provide a flow sensing device comprising a connection tube and a flow meter as described above, the flow meter having a flow amplifier connected to the circuit board, the flow amplifier extending partially into the connection tube.

Based on the flowmeter of this application embodiment, the connecting pipe can be connected to the pipeline that needs the inspection flow in the above-mentioned structure, and flow amplifier can have the fluid flow in the connecting pipe when flowing, monitors and measures the flow, and then can obtain the real-time flow in the fluid flow process and the total flow in the certain time.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a structure of an assembled body of a flowmeter according to an embodiment of the present application after a circuit board is packaged;

FIG. 2 is a schematic top view of a mounting body of a flowmeter according to an embodiment of the present disclosure after packaging a circuit board;

FIG. 3 is a schematic cross-sectional view of the direction A-A in FIG. 2 according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a cross-sectional exploded view of an assembled body after packaging a circuit board according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of an embodiment of the present application when the package includes a sealing portion and a perspective portion;

FIG. 6 is a schematic view of an exploded assembly of a package and a body according to an embodiment of the present disclosure;

FIG. 7 is a schematic view showing a first cross-sectional structure of the assembled body of the present invention after being mounted in a housing and mated with a light guide assembly;

FIG. 8 is a schematic view of a second cross-sectional structure of the assembled body of the present invention after being mounted in a housing and mated with a light guide assembly;

FIG. 9 is a schematic view showing a third cross-sectional structure of the assembled body of the present invention when the assembled body is assembled with the light guide assembly after being mounted in the housing;

FIG. 10 is a schematic view of a fourth cross-sectional structure of the assembled body of the present invention after being mounted in a housing and mated with a light guide assembly;

FIG. 11 is a schematic view showing a fifth cross-sectional structure of the assembled body of the present invention when the assembled body is assembled with the light guide assembly after being mounted in the housing;

FIG. 12 is a schematic view showing a sixth cross-sectional structure of the assembled body of the present invention after being mounted in a housing and mated with a light guide assembly;

FIG. 13 is a schematic view of a seventh cross-sectional structure of the assembled body of the present application when assembled with a light guide assembly after being mounted in a housing;

FIG. 14 is a schematic view of a flow rate detection device according to an embodiment of the present disclosure;

reference numerals illustrate:

100. assembling a main body; 110. an assembly groove; 200. a circuit board; 210. a coding region; 220. identifying the code; 300. a package; 310. a sealing part; 320. a perspective part; 400. a housing; 410. a receiving chamber; 420. an observation hole; 430. a cover plate; 500. a light guide assembly; 510. a convex lens; 520. a first mirror; 530. a second mirror; 540. a third mirror; 600. a light source member; 700. a connecting pipe; 800. a flow amplifier.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In order to solve the above-mentioned technical problem, please refer to fig. 1-14, a first aspect of the present application proposes a flowmeter, wherein the coding region 210 can be clearly observed through the light-transmitting region on the package 300 and the light source 600 while the package 300 protects the circuit board 200.

Referring to fig. 1 to 6, an embodiment of the present application provides a flow meter including a fitting body 100, a circuit board 200, a package 300, a light source member, and a photosensitive switching element, the fitting body 100 having a fitting groove 110; the circuit board 200 is mounted in the mounting groove 110, and the circuit board 200 has a coding region 210 thereon; the package 300 is disposed in the assembly groove 110, and the package 300 can seal and encapsulate the circuit board 200 in the assembly groove 110; the light source piece is connected with the packaging piece and is used for emitting light rays, and the emitted light rays at least irradiate the coding area; the photosensitive switch element is electrically connected with the circuit board and the light source piece, and when the photosensitive switch element is triggered, the circuit board is communicated with the light source piece, the light source piece and the packaging piece are exposed out of the assembly groove; the package 300 is at least partially a light-transmitting region, and the light-transmitting region corresponds to the coding region 210.

Based on the above embodiments of the present application, the assembly main body 100 may carry the circuit board 200 and the package 300, where various components, such as a processor, a memory, etc., are disposed on the circuit board 200, and the circuit board 200 can be electrically connected to and control each component of the flowmeter, for example, each component includes the flow amplifier 800 and the display, and the circuit board 200 can control the working state of the flow amplifier 800 and also can control and adjust the display state of the display. The package 300 is capable of packaging the assembly slot 110, and after the circuit board 200 is mounted in the assembly slot 110, the circuit board 200 may be packaged and protected by the package 300, and the package 300 may specifically seal the circuit board 200 in the assembly slot 110. The package 300 may have a light-transmitting area, or the whole package 300 is of a transparent structure, the circuit board 200 is provided with the code area 210, the code area 210 is provided with the corresponding identification code 220, after the package 300 packages the circuit board 200, when the photosensitive switch element is illuminated, the photosensitive switch element is triggered to conduct the circuit board and the light source element, the circuit board transmits electric energy to the light source element to enable the light source element to emit light, and the light emitted by the light source element irradiates to the code area, so that a user can clearly observe the identification code of the code area through the light-transmitting area.

Referring to fig. 7-13, in some embodiments of the present application, the flow meter further includes a housing having a receiving cavity and a viewing aperture in communication with the receiving cavity, a light guide assembly, and a cover plate, the fitting body disposed within the receiving cavity; the light guide assembly is positioned in the shell, the first end of the light guide assembly faces the light transmission area and is arranged above the light transmission area, or the first end of the light guide assembly is connected to the light transmission area; the second end of the light guide component is connected to the shell and communicated with the observation hole, and the observation hole can be used for observing the coding region of the circuit board; the cover plate is movably connected to the shell and is provided with a first position for covering the observation hole and a second position for opening the observation hole.

Based on the above embodiment of the present application, the setting of the cover plate 430 is used for covering the observation hole 420, when the coding region 210 of the circuit board 200 needs to be checked, the cover plate 430 is opened, so that the photosensitive switch element is exposed to the external light (may be natural light or artificial light), so that the circuit board is conducted with the light source, the light source illuminates the coding region, so as to be used for observation by the human eye, or shooting can be performed by the shooting device (the light can be assisted by the light to conveniently receive the reflected light of the coding region 210 on the circuit board 200 during shooting), and further, the light reflected by the coding region can be better reflected by the light guide component to the human eye, so as to further improve the definition of the coding region.

The cover plate 430 is movably connected to the housing 400, the cover plate 430 has a first position for covering the observation hole 420, the cover plate 430 can conceal the observation hole 420, and dust, oil dirt and the like can be prevented from polluting the observation hole 420 through the cover plate 430; the cover plate 430 further has a second position for opening the observation hole 420, and at this time, the coding region 210 on the circuit board 200 can be observed by human eyes, the housing 400 can protect the assembly main body 100, so that the possibility of damage of the assembly main body 100 is reduced, meanwhile, contamination of impurities such as dust, oil residue and the like to the assembly main body 100 and the package 300 can be prevented, and the assembly main body 100 can be specifically mounted in the accommodating cavity 410 of the housing 400. The light guide assembly 500 can guide light, the code region 210 can be opened at the end of the light guide assembly 500 away from the perspective part 320, specifically, the first end of the light guide assembly 500 faces the light transmission region and is arranged above the perspective part 320, the second end of the light guide assembly 500 can receive reflected light of the code region 210 on the circuit board 200 below the light transmission region, so that the identification code 220 of the code region 210 can be conveniently observed through the light guide assembly 500, and the first end of the light guide assembly 500 can also be directly connected to the perspective part 320; the second end of the light guide assembly 500 is connected to the housing 400, and after the observation hole 420 is formed in the housing 400 and the observation hole 420 is communicated with the second end of the light guide assembly 500, the identification code 220 can be directly observed on the outer side of the housing 400, so that the steps of opening the housing 400 are reduced, the observation time is saved, and the code region 210 of the circuit board 200 can be seen through the observation hole 420.

The housing 400 may be provided with a cover, and when the flowmeter is required to be assembled, disassembled and repaired, the cover may be opened to observe the inside of the housing 400.

It should be noted that, the cover 430 may be rotatably connected to the housing 400, and at this time, the viewing hole 420 may be opened or covered by a flip or the like; the cover 430 may also be slidably coupled to the housing 400, and may be slidably coupled to open or cover the viewing aperture 420. The cover plate 430 and/or the housing 400 may be provided with a limiting structure to limit the movement range of the cover plate 430, so as to reduce the possibility of falling off the cover plate 430; locking structures may also be provided on the cover 430 and/or the housing 400 to lock the cover 430 at different positions, so as to ensure connection stability of the cover 430 at corresponding positions. The cover 430 may be a rigid plate structure or a flexible curtain structure, and is specifically set according to needs, so long as the observation hole 420 can be opened or covered by the cover 430.

Referring to fig. 7 to 13, the observation hole 420 may be provided with an observation lens, and the light guide assembly 500 may include at least one lens.

The light source 600 may be a light emitting diode or may be another light emitting device. The light emitting color of the light source member 600 may be set as desired, and is not limited to white light, green light, blue light, red light, and the like.

Referring to fig. 5, in some embodiments of the present application, the package 300 includes a sealing part 310 and a perspective part 320, the sealing part 310 is fixedly connected to a side wall or a bottom wall of the assembly groove 110 at a peripheral side, the sealing part 310 covers the circuit board 200, and the sealing part 310 is hermetically connected to a connection position of the assembly groove 110; the transparent part 320 is disposed at the middle of the sealing part 310, the transparent part 320 is disposed opposite to the coding region 210, and the transparent region is disposed on the transparent part 320.

Based on the above-described embodiments of the present application, the sealing part 310 may seal the circuit board 200 in the assembly groove 110, and the circumferential side of the sealing part 310 may be sealed and fixedly coupled to the inner sidewall of the assembly groove 110; or the peripheral side of the sealing part 310 may be sealed and fixedly coupled to the bottom wall of the fitting groove 110; the peripheral side of the sealing part 310 may be sealed and fixedly connected to the inner side wall of the assembly groove 110, and the peripheral side of the other part of the sealing part 310 may be sealed and fixedly connected to the bottom wall of the assembly groove 110; or one side of the sealing part 310 near the bottom wall of the assembly groove 110 may be sealed and fixedly connected with the bottom wall of the assembly groove 110; as long as the circuit board 200 can be sealed and fixed in the assembly groove 110, the arrangement can further improve the assembly stability of the circuit board 200, reduce the possibility of damage to electronic components on the circuit board 200 caused by shaking and beating, and prolong the service life of the circuit board 200. The transparent part 320 may be disposed in the middle of the sealing part 310, and of course, the transparent part 320 corresponds to the position of the coding region 210, the transparent part 320 may be disposed at a position near the edge of the sealing part 310, the transparent region is disposed on the transparent part 320, the transparent part 320 may overlap with the entire transparent region, or only the transparent region may occupy part of the transparent part 320.

It should be noted that, the sealing portion 310 may be integrally provided with the perspective portion 320, for example, may be manufactured by a two-color injection molding method or by an additive molding method; the sealing portion 310 and the perspective portion 320 may be fixedly connected, and sealing of the connection portion needs to be ensured.

In some embodiments of the present application, the light guide assembly 500 includes a convex lens 510, the convex lens 510 being mounted on a light-transmitting region of the package 300, or the convex lens 510 being mounted on the viewing aperture 420.

Based on the above embodiments of the present application, the convex lens 510 can amplify the coding region 210 below the light-transmitting region, so that the identification code 220 on the coding region 210 can be observed more clearly, the convex lens 510 can be mounted on the light-transmitting region of the package 300, and the convex lens 510 can also be mounted on the observation hole 420.

The convex lens 510 may be a convex lens 510 with a convex side, or may be a convex lens 510 with convex sides. The convex lens 510 may also be replaced by a combination of lenses according to needs, and specifically may include an eyepiece and at least one objective lens, where each objective lens has a different magnification factor after being combined with the eyepiece, and an appropriate magnification factor may be adjusted according to needs, so as to more clearly view the identification code 220 of the code region 210.

In some embodiments of the present application, the light guide assembly 500 further includes at least one mirror capable of changing the light guide path of the light guide assembly 500.

Based on the embodiments described above, the reflective mirrors can change the light guiding path of the light guiding assembly 500, so that the setting position of the second end of the light guiding assembly 500 is more flexible, and the second end of the light guiding assembly 500 can be set at different positions by using different numbers and/or reflective mirrors at different positions, for example, the original position of the coding region 210 is upward, the identification code 220 in the coding region 210 can be seen only when looking down from above, and the corresponding observation hole 420 is also located above the housing 400; with the light guide assembly 500 described above, the encoded region 210 can be seen on the side or even below the housing 400 after the light guide path is changed by the mirror.

It should be noted that, under the cooperation of the reflective mirror and various lenses, the human eye can see the enlarged coding region 210 or the reduced coding region 210, and the opening position of the observation hole 420 is more flexible. The corresponding cover plate 430 may vary with the position of the viewing aperture 420.

It should be noted that, the light guide assembly 500 may also replace the reflective mirror with a structure that can guide light, such as an optical fiber, so as to change the light guide path of the light guide assembly 500, and the identification code 220 may be observed in a desired direction or position.

When one mirror is provided, the mirror is a first mirror 520, the first mirror 520 is disposed obliquely with respect to the code region 210, and the reflective surface of the first mirror 520 faces the code region 210, and the reflective direction of the first mirror 520 faces the observation hole 420. The first mirror 520 may change the setting position of the observation hole 420.

In some embodiments of the present application, the mirrors are provided in two, including a first mirror 520 and a second mirror 530 that are disposed opposite and in parallel, the first mirror 520 being disposed obliquely with respect to the code region 210, and the reflective surface of the first mirror 520 facing the code region 210; the second mirror 530 is disposed obliquely with respect to the viewing aperture 420, and the reflective surface of the second mirror 530 faces the viewing aperture 420.

Based on the above embodiment of the application, the two reflectors are provided, including the first reflector 520 and the second reflector 530 that are opposite and parallel to each other, the first reflector 520 is inclined with respect to the coding region 210, and the reflecting surface of the first reflector 520 faces the coding region 210, the first reflector 520 can change the light guiding path for the first time, so that the reflecting light of the coding region 210 can be changed in path, the reflecting light faces the second reflector 530, the second reflector 530 is inclined with respect to the viewing hole 420, and the reflecting surface of the second reflector 530 faces the viewing hole 420, after the second reflector receives the reflecting mirror of the first reflector 520, the reflecting light can be reflected again, and the reflecting light of the coding region 210 is finally led out from the viewing hole 420, and is captured by human eyes, so as to realize the effect that the human eyes observe the coding region 210. The second mirror 530 may change the set position of the viewing aperture 420 a second time.

It should be noted that a third reflector 540 may be further disposed, and the third reflector 540 may reflect the reflected light of the coding region 210 for the third time, so that the disposed position of the observation hole 420 may be changed again.

In some embodiments of the present application, the package 300 is a fully transparent structure, and the package 300 is formed after being packaged and solidified by transparent colloid; alternatively, the package 300 is a transparent plate that fixes and seals the notch of the assembly groove 110. In the above structure, the package 300 may be formed by solidifying a transparent gel, that is, the package 300 may be formed by molding a fluid. The package 300 may be configured as a separate transparent plate, and may be fixed and sealed to the notch of the assembly groove 110 by bonding, welding, soldering, or the like, as needed. The fixing and sealing of the assembly groove 110 can also be achieved through the cooperation of the package 300 and the corresponding sealing element, at this time, the package 300 and the assembly main body 100 can be connected through a clamping structure, a fixing structure and the like, and the fixing structure can be a screw, a bolt and the like.

In a second aspect, referring to fig. 14, an embodiment of the present application provides a flow detection device including a connection pipe 700 and a flow meter as described above, the flow meter having a flow amplifier 800, the flow amplifier 800 being connected to the circuit board 200, the flow amplifier 800 extending partially into the connection pipe 700. In the above structure, the connection pipe 700 may be connected to a pipe for checking flow, and the flow amplifier 800 may monitor and meter the flow when the connection pipe 700 has fluid flow, so as to obtain real-time flow in the fluid flow process and total flow in a certain time.

Based on the above-described embodiments of the present application, the flow rate detection device having the above-described flow meter can observe the encoded region 210 through the light-transmitting region on the package 300 while protecting the circuit board 200 through the package 300. Specifically, the assembly body 100 may carry the circuit board 200 and the package 300, where various components, such as a processor, a memory, etc., are disposed on the circuit board 200, and the circuit board 200 can be electrically connected to and control each component of the flowmeter, for example, each component includes the flow amplifier 800 and the display, and the circuit board 200 can control the working state of the flow amplifier 800 and also can control and adjust the display state of the display. The package 300 is capable of packaging the assembly slot 110, and after the circuit board 200 is mounted in the assembly slot 110, the circuit board 200 may be packaged and protected by the package 300, and the package 300 may specifically seal the circuit board 200 in the assembly slot 110. The package 300 may have a light-transmitting area, or the entire package 300 may have a transparent structure, the circuit board 200 may have the code area 210 thereon, the code area 210 may have the corresponding identification code 220 thereon, and after the package 300 encapsulates the circuit board 200, the identification code 220 of the code area 210 may be observed through the light-transmitting area. Embodiments of the present application are capable of protecting the circuit board 200 through the package 300 while the encoded region 210 can be viewed through the light-transmitting region on the package 300.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, this is for convenience of description and simplification of the description, but does not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely used for illustration and are not to be construed as limitations of the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to the specific circumstances.

The foregoing description of the preferred embodiment of the present invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (8)

1. A flow meter, the flow meter comprising:

a fitting body having a fitting groove;

the circuit board is arranged in the assembly groove and is provided with a coding area;

the packaging piece is arranged in the assembly groove and can seal and package the circuit board in the assembly groove;

the light source piece is connected with the packaging piece and is used for emitting light rays, and the emitted light rays at least irradiate the coding area;

the photosensitive switch element is electrically connected with the circuit board and the light source piece, and when the photosensitive switch element is triggered, the circuit board is communicated with the light source piece, the light source piece and the packaging piece are exposed out of the assembly groove;

the package is at least partially a light-transmitting area, and the light-transmitting area corresponds to the coding area.

2. The flowmeter of claim 1, further comprising:

the shell is provided with a containing cavity and an observation hole communicated with the containing cavity, and the assembly main body is arranged in the containing cavity;

the first end of the light guide component faces the light transmission area and is arranged above the light transmission area, or the first end of the light guide component is connected to the light transmission area; the second end of the light guide assembly is connected to the shell and communicated with the observation hole, and the observation hole can be used for observing the coding region of the circuit board;

the cover plate is movably connected to the shell and is provided with a first position for covering the observation hole and a second position for opening the observation hole.

3. The flowmeter of claim 2, wherein said package comprises:

the periphery of the sealing part is fixedly connected to the side wall or the bottom wall of the assembly groove, the sealing part covers the circuit board, the sealing part is in sealing connection with the connection position of the assembly groove, and the sealing part is provided with a containing cavity for containing the light source component;

the transparent part is arranged in the middle of the sealing part, the arrangement position of the transparent part is opposite to the coding region, the light-transmitting region is arranged on the transparent part, and the accommodating cavity extends to the interface between the transparent part and the sealing part.

4. The flowmeter of claim 2, wherein said light guide assembly comprises a convex lens mounted on said light transmissive region of said package or on said viewing aperture.

5. The flowmeter of claim 4, wherein said light guide assembly further comprises at least one mirror capable of changing a light guide path of said light guide assembly.

6. The flowmeter of claim 5, wherein said mirrors are provided in two, including first and second mirrors disposed opposite and in parallel, said first mirror being disposed obliquely with respect to said code region and a reflective surface of said first mirror facing said code region; the second reflector is obliquely arranged relative to the observation hole, and the reflecting surface of the second reflector faces the observation hole.

7. The flowmeter of claim 1, wherein said package is of a fully transparent construction, said package being encapsulated by a transparent gel and molded after solidification; or alternatively, the process may be performed,

the packaging piece is a transparent plate, and the transparent plate is fixed and seals the notch of the assembly groove.

8. A flow rate detection device, comprising:

a connecting pipe; the method comprises the steps of,

the flow meter of any one of claims 1 to 7 having a flow amplifier connected to the circuit board, the flow amplifier extending partially into the connecting tube.