Photoelectric flow sensor capable of accurately detecting flow

Abstract

The utility model relates to the field of photoelectric flow sensors, in particular to a photoelectric flow sensor capable of accurately detecting flow, which comprises a flow meter body, the flow meter body is provided with a water inlet channel, a measuring chamber and a water outlet channel which are communicated in sequence, and an impeller is arranged in the measuring chamber. Wherein the impeller is driven to rotate through liquid flowing into the measuring cavity, and a photoelectric sensing device capable of sensing a signal of a single blade of the impeller is further arranged on the flowmeter body. Due to the fact that the photoelectric sensing device can detect signals when the blades pass through the impeller every time, the impeller does not need to be waited to rotate for a whole circle, the detection frequency is greatly improved, and flow data are more real-time and continuous. The design of a magnet in a traditional flow meter is omitted, the weight and the size of the impeller are reduced, and the whole structure of the sensor is more compact and portable. The manufacturing cost is reduced, and installation and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the field of flow sensors, in particular to a photoelectric flow sensor for accurately detecting flow. Background Art

[0002] Traditional flowmeter designs typically use a combination of Hall effect sensors and magnets to detect fluid flow. The basic principle of this design is to use the Hall effect sensor to detect the changes in the magnetic field generated by the magnet as the impeller rotates, thereby inferring the fluid flow rate. However, this design has several significant drawbacks:

[0003] 1. When only one magnet is installed on the impeller, the Hall effect sensor can only detect a signal once per impeller rotation. This limits the flowmeter's resolution and accuracy. To improve accuracy, some manufacturers choose to install multiple magnets on the impeller. However, this not only increases the overall weight but also significantly increases the flowmeter's structural size, making installation and maintenance more difficult.

[0004] 2. Whether using a single or multiple magnets, the magnets are externally attached to the impeller. This makes it difficult to achieve dynamic balancing during impeller rotation, and can easily cause impeller vibration. In severe cases, this vibration can cause wear on the impeller shaft, affecting the flowmeter's accuracy and service life.

[0005] 3. Due to the presence of the magnet, the water flow needs to overcome the additional magnetic force to drive the impeller to rotate. This means that a relatively large water flow is required to push the impeller, thus limiting the flow meter's detection accuracy under low flow conditions. Summary of the Invention

[0006] To address these issues, the present invention provides a photoelectric flow sensor that accurately detects flow. This sensor detects a signal each time an impeller blade passes by, eliminating the need to wait for the impeller to complete a full rotation. This significantly increases detection frequency, providing more real-time and continuous flow data. By eliminating the magnets found in traditional flowmeters, the weight and size of the impeller are reduced, making the sensor's overall structure more compact and lightweight. This not only reduces manufacturing costs but also facilitates installation and maintenance.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a photoelectric flow sensor for accurately detecting flow, comprising a flow meter body, the flow meter body being provided with a water inlet channel, a measuring chamber, and a water outlet channel which are connected in sequence, an impeller being provided in the measuring chamber, wherein the impeller is driven to rotate by the liquid flowing into the measuring chamber, and the flow meter body is also provided with a photoelectric sensing device which can sense the signal of a single blade of the impeller.

[0008] To further discuss, the flowmeter body includes a flowmeter lower cover and a flowmeter upper cover, wherein the flowmeter lower cover is provided with a water inlet channel and a water outlet channel, wherein the flowmeter upper cover is covered on the surface of the flowmeter lower cover and forms a measuring cavity; and a light-transmitting installation slot is provided on the surface of the flowmeter upper cover, and the photoelectric sensor is mounted at the installation slot, wherein the photoelectric sensing device includes a circuit board, a photoelectric transmitting end and a photoelectric receiving end arranged oppositely; and an impeller movably arranged in the measuring cavity is located between the photoelectric transmitting end and the photoelectric receiving end.

[0009] Further discussion is made, wherein a sending slot for installing the photoelectric sending end and a receiving slot for installing the photoelectric receiving end are provided on both sides of the bottom of the installation slot, and a first impeller placement slot for the impeller to enter is provided at the bottom, and the first impeller placement slot is located between the sending slot and the receiving slot.

[0010] Further discussion, the side walls of the sending slot and the receiving slot are both provided with ribs extending along their own depth.

[0011] Further discussion is that a circle of limiting steps is also provided on the inner wall of the installation slot, and a number of positioning columns are provided on the surface of the limiting steps. A number of positioning holes are provided on the circuit board, wherein the circuit board is pressed on the surface of the limiting steps and the positioning columns pass through the positioning holes. At the same time, the circuit board is electrically connected to the photoelectric transmitting end and the photoelectric receiving end.

[0012] Further discussion shows that the side wall of the sending slot close to the first impeller placement slot, the side wall of the receiving slot close to the first impeller placement slot, the side wall of the first impeller placement slot close to the sending slot, and the side wall of the first impeller placement slot close to the receiving slot are all highly light-transmitting sides, and the remaining sides of the flow meter cover are all frosted.

[0013] Further discussion is that the surface of the lower cover of the flow meter is also provided with a second impeller placement slot for the impeller to enter, wherein the first impeller placement slot and the second impeller placement slot form a measuring chamber, and shaft slots are also provided on both sides of the opening of the second impeller placement slot, and the shaft slot is equipped with a shaft, and the impeller is movably mounted in the measuring chamber through the shaft.

[0014] To further discuss, two symmetrically arranged pressing protrusions are provided at the bottom of the flow meter upper cover, wherein the pressing protrusions are respectively pressed on the surface of the rotating shaft groove.

[0015] Further discussion, a circle of first sealing protrusions is also provided on the bottom of the flow meter upper cover, and a circle of second sealing grooves is provided on the surface of the flow meter lower cover, wherein the first sealing protrusion covers the second sealing groove, and the sealing ring is provided in the sealing cavity surrounded by the first sealing protrusion and the second sealing groove.

[0016] To further discuss, the four corners of the upper cover of the flow meter are provided with fitting screw holes, and the four corners of the lower cover of the flow meter are provided with corresponding fitting connection parts, wherein the screws pass through the fitting connection parts and the corresponding fitting screw holes to realize the fitting of the two.

[0017] Further discussion, the lower cover of the flow meter is also connected to a mounting plate, and a plurality of mounting holes are provided on the mounting plate.

[0018] The beneficial effects of the present invention are that the photoelectric sensor device can detect a signal each time an impeller blade passes by, without having to wait for the impeller to complete a full rotation. This greatly increases the detection frequency and makes flow data more real-time and continuous. The magnet design used in traditional flowmeters is eliminated, reducing the weight and volume of the impeller, making the overall sensor structure more compact and lightweight. This not only reduces manufacturing costs but also facilitates installation and maintenance. Furthermore, by eliminating the external magnet, the impeller design can focus more on dynamic balancing, reducing vibration and wear during rotation, and improving the stability and reliability of the sensor. Furthermore, the resistance on the impeller (such as the magnet) is reduced, making it easier for the water flow to drive the impeller rotation. This not only reduces the water flow requirement but also improves the detection sensitivity, allowing accurate measurements even in low flow conditions. Furthermore, the high sensitivity of the photoelectric sensor device can more accurately reflect changes in water flow, making the output circuit parameter function graph more linear. This facilitates subsequent data processing and analysis, improving the accuracy and reliability of the measurement results. The lack of direct contact between the photoelectric sensor device and the impeller reduces the possibility of wear and failure. At the same time, the sealing structure and press-fit design inside the sensor also improve its waterproof and dustproof properties, enhancing durability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the photoelectric flow sensor.

[0020] Figure 2 It is a structural diagram of the lower cover of the flow meter.

[0021] Figure 3 It is a structural diagram of the flow meter cover.

[0022] Figure 4 This is a structural diagram of the flow meter lower cover from another perspective.

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the photoelectric flow sensor.

[0024] Explanation of the accompanying numbers: 1. Flow meter lower cover; 2. Flow meter upper cover; 3. Circuit board; 11. Water inlet channel; 112. Second impeller placement slot; 1121. Rotating shaft slot; 1122. Second sealing slot; 113. Water outlet channel; 114. Mounting plate; 1141. Mounting hole; 121. Mounting slot; 1211. Sending slot; 1212. Receiving slot; 122. Limiting step; 123. Positioning column; 1213. Rib; 124. First impeller placement slot; 125. Press-fit protrusion; 126. First sealing protrusion; 4. Rotating shaft; 5. Impeller; 6. Photoelectric transmitting end; 7. Photoelectric receiving end. DETAILED DESCRIPTION

[0025] See also Figure 1-5 As shown, the utility model relates to a photoelectric flow sensor for accurately detecting flow, including a flow meter body, which is provided with a water inlet channel 11, a measuring chamber, and a water outlet channel 113 connected in sequence, and an impeller 5 is provided in the measuring chamber, wherein the impeller 5 is driven to rotate by the liquid flowing into the measuring chamber, and the flow meter body is also provided with a photoelectric sensing device that can sense the signal of a single blade of the impeller 5.

[0026] Among the benefits, the photoelectric sensor can detect a signal each time the impeller 5 blades pass by, eliminating the need to wait for the impeller 5 to complete a full rotation. This significantly increases detection frequency and provides more real-time and continuous flow data. By eliminating the magnets found in conventional flowmeters, the weight and volume of the impeller 5 are reduced, making the overall sensor structure more compact and lightweight. This not only reduces manufacturing costs but also facilitates installation and maintenance. Furthermore, by eliminating the external magnets, the design of the impeller 5 can focus more on dynamic balancing, reducing vibration and wear during rotation, and improving the stability and reliability of the sensor. Furthermore, the resistance on the impeller 5 (such as the magnets) is reduced, making it easier for the water flow to drive the impeller 5 to rotate. This not only reduces the water flow requirement but also improves detection sensitivity, enabling accurate measurements even at low flow rates. Furthermore, the high sensitivity of the photoelectric sensor can more accurately reflect changes in water flow, resulting in a more linear output circuit parameter function graph. This facilitates subsequent data processing and analysis, improving the accuracy and reliability of the measurement results. The lack of direct contact between the photoelectric sensor and the impeller 5 reduces the potential for wear and failure. At the same time, the sealing structure and press-fit design inside the sensor also improve its waterproof and dustproof properties, enhancing durability and reliability.

[0027] To further discuss, the flowmeter body includes a flowmeter lower cover 1 and a flowmeter upper cover 2, wherein the flowmeter lower cover 1 is provided with a water inlet channel 11 and a water outlet channel 113, wherein the flowmeter upper cover 2 covers the surface of the flowmeter lower cover 1 and forms a measuring cavity; and a light-transmitting installation slot 121 is provided on the surface of the flowmeter upper cover 2, and the photoelectric sensor is mounted at the installation slot 121, wherein the photoelectric sensing device includes a circuit board 3, a photoelectric transmitting end 6 and a photoelectric receiving end 7 arranged oppositely; and the impeller 5 movably arranged in the measuring cavity is located between the photoelectric transmitting end 6 and the photoelectric receiving end 7.

[0028] The flowmeter lower cover 1 is the basic part of the sensor, and is internally designed with an inlet channel 11 and an outlet channel 113. These two channels are located at both ends of the flowmeter lower cover 1, forming a path for the liquid to flow. The inlet channel 11 is responsible for introducing the fluid to be measured into the measuring cavity, while the outlet channel 113 is responsible for discharging the measured fluid. This design ensures that the fluid can pass through the sensor smoothly for accurate flow detection. The flowmeter upper cover 2 is covered on the surface of the flowmeter lower cover 1, and the two are tightly combined to form a closed measuring cavity. This measuring cavity is the core area where the fluid is detected. In order to facilitate the installation and signal transmission of the photoelectric sensor device, a light-transmitting installation slot 121 is specially set on the surface of the flowmeter upper cover 2. This installation slot 121 not only provides a stable installation platform for the photoelectric sensor, but also ensures that the photoelectric signal can smoothly penetrate the upper cover, realizing accurate detection of the impeller 5 blade signal. The photoelectric sensor device mainly consists of three parts: a circuit board 3, a photoelectric transmitting end 6, and a photoelectric receiving end 7. These three components work together to complete the signal acquisition, conversion, and transmission process. As the control center of the photoelectric sensor device, the circuit board 3 is responsible for receiving signals from the photoelectric transmitter 6 and the photoelectric receiver 7 and performing appropriate processing. Furthermore, the circuit board 3 also connects to other electronic components to enable communication and control with other sensor components. The photoelectric transmitter 6, located on one side of the mounting slot 121, is responsible for emitting a light signal of a specific wavelength. When the blades of the impeller 5 rotate between the photoelectric transmitter 6 and the photoelectric receiver 7, the light signal is blocked or reflected by the blades, resulting in a varying signal. The photoelectric receiver 7, located on the other side of the mounting slot 121, is opposite the photoelectric transmitter 6. It receives the light signal from the photoelectric transmitter 6 and detects changes in the light signal. When the blades block or reflect the light signal, the photoelectric receiver 7 captures the change and converts it into an electrical signal for output. The impeller 5 is movably positioned within the measurement chamber, located between the photoelectric transmitter 6 and the photoelectric receiver 7. The impeller 5 rotates due to the fluid, and its blades periodically block or reflect the light signal emitted by the photoelectric transmitter 6 during rotation. This periodic blocking or reflection phenomenon is captured by the photoelectric receiving end 7 and converted into an electrical signal output, thereby achieving accurate detection of the fluid flow rate.

[0029] The beneficial effect is that the flowmeter body consists of a lower cover 1 and an upper cover 2. This design makes the entire sensor structure compact and easy to install and maintain. Furthermore, the photoelectric sensor device is directly mounted in a light-transmitting mounting slot 121 on the surface of the upper cover 2, achieving close integration of the sensor and flowmeter and improving overall space utilization.

[0030] By placing an impeller 5 within the measurement chamber and using the flowing liquid to drive its rotation, combined with a photoelectric sensor (including a photoelectric transmitter 6 and a photoelectric receiver 7) sensing signals from individual blades of the impeller 5, precise detection of fluid flow can be achieved. This non-contact measurement method reduces mechanical wear and error, improving measurement accuracy and reliability.

[0031] To further discuss, a sending slot 1211 for installing the photoelectric sending end 6 and a receiving slot 1212 for installing the photoelectric receiving end 7 are provided on both sides of the bottom of the installation slot 121, and a first impeller placement slot 124 for the impeller 5 to enter is provided at the bottom, and the first impeller placement slot 124 is located between the sending slot 1211 and the receiving slot 1212.

[0032] The beneficial effect is that by providing a transmitting slot 1211 and a receiving slot 1212 on either side of the bottom of the mounting slot 121, and precisely controlling their relative positions, the photoelectric transmitting terminal 6 and the photoelectric receiving terminal 7 are precisely aligned during installation. This precise alignment helps reduce errors and interference during signal transmission, improving measurement accuracy and reliability. Furthermore, the arrangement of the transmitting slot 1211 and the receiving slot 1212 makes the optical path of the photoelectric sensor device more rational and efficient. When the impeller 5 is located between the transmitting slot 1211 and the receiving slot 1212, the rotation of its blades can precisely block or reflect the light emitted by the photoelectric transmitting terminal 6, thereby triggering the photoelectric receiving terminal 7 to receive the signal. This design optimizes the optical transmission path and improves signal sensitivity and stability. The transmitting slot 1211 and the receiving slot 1212 provide excellent protection for the photoelectric transmitting terminal 6 and the photoelectric receiving terminal 7. They not only restrict the installation position of the photoelectric element, but also prevent the intrusion of external impurities and liquids, ensuring the safety and stability of the photoelectric element. This design helps extend the lifespan of the photoelectric element and improve the durability of the sensor. The provision of transmitting slot 1211, receiving slot 1212, and first impeller placement slot 124 simplifies the installation of the photoelectric sensor device and impeller 5. Users can quickly install the device according to the pre-set slots, eliminating the need for complex debugging and calibration. This design reduces installation difficulty and cost, while improving work efficiency.

[0033] The provision of the first impeller placement slot 124 enables the impeller 5 to maintain a relatively stable position during rotation. This limits the axial and radial movement of the impeller 5, reducing measurement errors caused by the unstable position of the impeller 5. This design helps to improve the stability and repeatability of the measurement. The rational layout of the sending slot 1211, the receiving slot 1212, and the first impeller placement slot 124 makes the structure of the entire flowmeter body more compact. They fully utilize the space between the flowmeter upper cover 2 and the flowmeter lower cover 1, avoid unnecessary structural redundancy, and improve the overall space utilization and aesthetics.

[0034] To further discuss, the side walls of the sending slot 1211 and the receiving slot 1212 are both provided with ribs 1213 extending along their depth.

[0035] Because the ribs 1213 are raised, they can closely contact the corresponding side surfaces of the photoelectric transmitting terminal 6 and the photoelectric receiving terminal 7, thereby providing a stable mounting support. This stable mounting not only prevents the photoelectric elements from shaking and shifting during operation, but also ensures their good connection with the flow meter body, improving the overall stability and reliability.

[0036] To further discuss, a circle of limiting steps 122 is also provided on the inner wall of the installation slot 121, and a number of positioning columns 123 are provided on the surface of the limiting steps 122. A number of positioning holes are provided on the circuit board 3, wherein the circuit board 3 is pressed on the surface of the limiting steps 122 and the positioning columns 123 pass through the positioning holes, and at the same time, the circuit board 3 is electrically connected to the photoelectric transmitting end 6 and the photoelectric receiving end 7.

[0037] The limiting step 122 provides a precise installation reference surface for the circuit board 3, ensuring that the circuit board 3 can be accurately placed in the predetermined position during the installation process. At the same time, the positioning column 123 passes through the positioning hole on the circuit board 3, realizing a firm connection between the circuit board 3 and the mounting slot 121. This design not only ensures the stability of the installation of the circuit board 3, but also avoids the displacement or loosening of the circuit board 3 due to improper installation. The design of the limiting step 122 and the positioning column 123 simplifies the assembly process of the circuit board 3 with the optoelectronic transmitting end 6 and the optoelectronic receiving end 7. During installation, the user only needs to align the circuit board 3 with the limiting step 122 and gently press it in, so that the positioning column 123 automatically passes through the positioning hole. This "one-click" installation method greatly improves assembly efficiency and reduces labor costs and error rates.

[0038] To further discuss, the side wall of the sending slot 1211 close to the first impeller placement slot 124, the side wall of the receiving slot 1212 close to the first impeller placement slot 124, the side wall of the first impeller placement slot 124 close to the sending slot 1211, and the side wall of the first impeller placement slot 124 close to the receiving slot 1212 are all highly light-transmitting sides, and the remaining sides of the flowmeter cover 2 are all frosted.

[0039] Designing the sidewalls associated with the optical path around the transmitting slot 1211, receiving slot 1212, and the first impeller placement slot 124 to be highly transparent minimizes the scattering and absorption of light on these sidewalls, ensuring that light emitted by the photoelectric transmitting end 6 can be efficiently transmitted to the photoelectric receiving end 7. This design optimizes the optical transmission path and improves the signal reception sensitivity and measurement accuracy of the photoelectric sensor device. In addition, the remaining sides of the flowmeter cover 2 are frosted to effectively reduce direct exposure to and reflection of external light on these sides. This treatment reduces the interference of external light on the internal optical path transmission of the photoelectric sensor device, ensuring the stability and accuracy of the photoelectric signal.

[0040] To further discuss, the surface of the flow meter lower cover 1 is also provided with a second impeller placement slot 112 for the impeller 5 to enter, wherein the first impeller placement slot 124 and the second impeller placement slot 112 form a measuring chamber, and the second impeller placement slot 112 is also provided with a rotating shaft slot 1121 on both sides of the opening, and the rotating shaft slot 1121 is equipped with a rotating shaft, and the impeller 5 is movably mounted in the measuring chamber through the rotating shaft 4.

[0041] The first impeller placement slot 124 and the second impeller placement slot 112 together form a complete measuring chamber. This chamber is the key area where the liquid flows through and drives the impeller 5 to rotate. By precisely docking the two slots, a sealed and stable measurement environment is formed, which ensures the smoothness and stability of the fluid during the flow, thereby improving the accuracy of the flow measurement. The second impeller placement slot 112 is provided with a rotating shaft slot 1121 on both sides of the opening, and is equipped with a rotating shaft 4. The impeller 5 is movably mounted in the measuring chamber through the rotating shaft 4. This design ensures the stability and reliability of the impeller 5 during the rotation process. As the support point of the impeller 5, the rotating shaft 4 can effectively withstand the force generated by the liquid flow and prevent the impeller 5 from shaking or offsetting during the rotation process, thereby ensuring the continuity and accuracy of the flow measurement.

[0042] To further discuss, two symmetrically arranged pressing protrusions 125 are provided at the bottom of the flow meter upper cover 2 , wherein the pressing protrusions 125 are pressed onto the surface of the rotating shaft groove 1121 respectively.

[0043] The beneficial effect is that the pressing protrusion 125 stabilizes the position of the rotating shaft 4 in the rotating shaft groove 1121 through its pressure. This stable design reduces the shaking and deviation of the rotating shaft 4 during the rotation of the impeller 5, ensuring the smooth rotation of the impeller 5 and the accuracy of the measurement results.

[0044] To further discuss, a circle of first sealing protrusions 126 is also protruding from the bottom of the flowmeter upper cover 2, and a circle of second sealing grooves 1122 aligned with the first sealing grooves is provided on the surface of the flowmeter lower cover 1, wherein the first sealing protrusions 126 cover the second sealing grooves 1122, and the sealing ring is arranged in the sealing cavity surrounded by the first sealing protrusions 126 and the second sealing grooves 1122.

[0045] The first sealing protrusions 126 on the bottom of the flowmeter upper cover 2 and the second sealing grooves 1122 on the surface of the flowmeter lower cover 1 are tightly matched to form a sealed cavity. The sealing ring is set in this cavity, which can significantly enhance the sealing performance of the sensor as a whole.

[0046] To further discuss, the four corners of the flow meter upper cover 2 are provided with fitting screw holes, and the four corners of the flow meter lower cover 1 are provided with corresponding fitting connection parts, wherein screws pass through the fitting connection parts and the corresponding fitting screw holes to realize the fitting of the two.

[0047] The flowmeter upper cover 2 and the flowmeter lower cover 1 are fastened together using screws through the mounting screw holes at the four corners and the corresponding mounting connections. This design ensures the stability of the flowmeter body structure, and maintains the integrity and stability of the sensor structure even under harsh working conditions such as high pressure, high flow rate or vibration, thereby ensuring measurement accuracy. The screw connection method makes the disassembly and assembly between the flowmeter upper cover 2 and the flowmeter lower cover 1 simple and quick. When maintenance or replacement of internal components of the sensor is required, the user can easily unscrew the screws, separate the upper cover and the lower cover, perform the necessary operations, and then reassemble them. This design improves the convenience and efficiency of maintenance.

[0048] Furthermore, the flowmeter's lower cover 1 is connected to a mounting plate 114, which is provided with several mounting holes 1141. The design of mounting plate 114 facilitates flowmeter installation. Through the mounting holes 1141 on mounting plate 114, users can quickly and securely mount the sensor to various piping systems, equipment, or racks. This design improves installation efficiency and reduces installation difficulty.

[0049] The above embodiments are merely descriptions of preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A photoelectric flow sensor for accurately detecting flow, characterized by: The flowmeter comprises a flowmeter body, the flowmeter body being provided with a water inlet channel, a measuring chamber, and a water outlet channel which are sequentially connected, the measuring chamber being provided with an impeller, wherein the impeller is driven to rotate by the liquid flowing into the measuring chamber, and the flowmeter body being further provided with a photoelectric sensor device capable of sensing a signal from a single blade of the impeller; The flowmeter body includes a flowmeter lower cover and a flowmeter upper cover, wherein the flowmeter lower cover is provided with a water inlet channel and a water outlet channel, wherein the flowmeter upper cover is covered on the surface of the flowmeter lower cover to form a measuring cavity; and a light-transmitting mounting slot is provided on the surface of the flowmeter upper cover, and the photoelectric sensor device is mounted in the mounting slot, wherein the photoelectric sensor device includes a circuit board, a photoelectric transmitting end and a photoelectric receiving end arranged oppositely; and an impeller movably provided in the measuring cavity is located between the photoelectric transmitting end and the photoelectric receiving end; A sending slot for installing the photoelectric sending end and a receiving slot for installing the photoelectric receiving end are also provided on both sides of the bottom of the installation slot. A first impeller placement slot for the impeller to enter is provided at the bottom, and the first impeller placement slot is located between the sending slot and the receiving slot; The side wall of the sending slot close to the first impeller placement slot, the side wall of the receiving slot close to the first impeller placement slot, the side wall of the first impeller placement slot close to the sending slot, and the side wall of the first impeller placement slot close to the receiving slot are all high-transmittance sides, and the remaining surfaces of the flowmeter cover are all frosted.

2. The photoelectric flow sensor for accurately detecting flow according to claim 1, characterized in that: The side walls of the sending slot and the receiving slot are both provided with ribs extending along their depth.

3. The photoelectric flow sensor for accurately detecting flow according to claim 1, characterized in that: A circle of limiting steps is also provided on the inner side wall of the mounting slot, and a number of positioning posts are provided on the surface of the limiting steps. A number of positioning holes are provided on the circuit board, wherein the circuit board is pressed onto the surface of the limiting steps and the positioning posts pass through the positioning holes. At the same time, the circuit board is electrically connected to the photoelectric transmitting end and the photoelectric receiving end.

4. The photoelectric flow sensor for accurately detecting flow according to claim 1, characterized in that: The surface of the lower cover of the flowmeter is also provided with a second impeller placement slot for the impeller to enter, wherein the first impeller placement slot and the second impeller placement slot form a measuring chamber, and shaft slots are also provided on both sides of the opening of the second impeller placement slot, and the shaft slot is equipped with a shaft, and the impeller is movably mounted in the measuring chamber through the shaft.

5. The photoelectric flow sensor for accurately detecting flow according to claim 4, characterized in that: The bottom of the flow meter upper cover is provided with two symmetrically arranged pressing protrusions, wherein the pressing protrusions are pressed on the surface of the rotating shaft groove respectively.

6. The photoelectric flow sensor for accurately detecting flow according to claim 4, characterized in that: A circle of first sealing protrusions is also protruding from the bottom of the flowmeter upper cover, and a circle of second sealing grooves aligned with the first sealing grooves is provided on the surface of the flowmeter lower cover, wherein the first sealing protrusion covers the second sealing grooves, and the sealing ring is arranged in a sealing cavity surrounded by the first sealing protrusions and the second sealing grooves.

7. The photoelectric flow sensor for accurately detecting flow according to claim 1, characterized in that: The four corners of the upper cover of the flow meter are provided with fitting screw holes, and the four corners of the lower cover of the flow meter are provided with corresponding fitting connection parts, wherein the screws pass through the fitting connection parts and the corresponding fitting screw holes to realize the fitting of the two.

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