Ultrasonic water flow sensor

Abstract

The utility model relates to an ultrasonic water flow sensor which comprises a detection pipe body, an ultrasonic transmitting head, an ultrasonic receiving head and a reflection assembly installed in the detection pipe body. The detection pipe body sequentially comprises a first pipe cavity, a detection pipe cavity and a second pipe cavity in the water flow direction; a first flow guide face and a detection inlet located in the middle of the first flow guide face are formed between the first pipe cavity and the detection pipe cavity. A second flow guide surface and a detection outlet positioned in the middle of the second flow guide surface are formed between the second pipe cavity and the detection pipe cavity; the detection pipe body is provided with a first joint and a second joint; the reflection assembly comprises a first reflection piece installed in the first pipe cavity and a second reflection piece installed in the second pipe cavity. The first reflecting piece is provided with a first reflecting surface; and the second reflecting piece is provided with a second reflecting surface. The probability that the detection precision of the water flow is reduced due to the fact that impurities in water remain in the detection pipe body can be reduced.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to an ultrasonic water flow sensor. Background Art

[0002] Water flow sensors are widely used in the water industry, industrial production, environmental monitoring and other fields. Currently, ultrasonic technology has gradually become one of the important technologies for water flow sensors due to its non-invasiveness, high precision and reliability.

[0003] Reference Figure 1 The existing ultrasonic water flow sensor includes a detection tube body 1', an ultrasonic transmitter 2', an ultrasonic receiver 3', a detection inner tube 11' installed in the detection tube body 1', and a reflector assembly 4' removably mounted on the detection inner tube 11'. The reflector assembly 4' includes a first reflector 44' and a second reflector 45'. The detection inner tube 11' has inner tube sockets 111' at both ends for plugging into the first and second reflectors 44', 45'. The two ends of the detection inner tube 11' form a built-in cavity 112' with the inner wall of the detection tube body 1'. When the ultrasonic wave emitted by the ultrasonic transmitter 2' is reflected by the first reflector 44' to the second reflector 45', the second reflector 45' reflects the ultrasonic wave to the ultrasonic receiver 3', thereby acquiring water flow data within the detection tube body 1'.

[0004] Regarding the above-mentioned related technologies, the inventors believe that when the ultrasonic water flow sensor is in long-term operation, impurities in the water are likely to remain in the reflective component 4', the inner tube socket 111' and the built-in cavity 112', thereby reducing the detection accuracy of the water flow. Utility Model Content

[0005] In order to reduce the probability of reducing the detection accuracy of water flow due to impurities in the water remaining in the detection tube body, the present application provides an ultrasonic water flow sensor.

[0006] The ultrasonic water flow sensor provided in this application adopts the following technical solution:

[0007] An ultrasonic water flow sensor comprises a detection tube body, an ultrasonic transmitting head, an ultrasonic receiving head and a reflective assembly installed in the detection tube body; the detection tube body comprises a first tube cavity, a detection tube cavity and a second tube cavity in sequence along the water flow direction; a first guide surface and a detection inlet located in the middle of the first guide surface are formed between the first tube cavity and the detection tube cavity; a second guide surface and a detection outlet located in the middle of the second guide surface are formed between the second tube cavity and the detection tube cavity; the detection tube body has a first joint for mounting the ultrasonic transmitting head and communicating with the first tube cavity, and a second joint for mounting the ultrasonic receiving head and communicating with the second tube cavity; the reflective assembly comprises a first reflective member installed in the first tube cavity and a second reflective member installed in the second tube cavity; the first reflective member has a first reflective surface for transmitting the ultrasonic wave emitted by the ultrasonic transmitting head to the detection inlet; the second reflective member has a second reflective surface for reflecting the ultrasonic wave reflected by the first reflective surface to the ultrasonic receiving head.

[0008] By adopting the above technical solution, when water flows into and passes through the first lumen of the detection tube body, the ultrasonic transmitter emits ultrasonic waves to the first reflective surface. The first reflective surface reflects the ultrasonic waves toward the detection lumen. After the ultrasonic waves enter the detection inlet, pass through the detection lumen, and exit from the detection outlet, the second reflective surface reflects the ultrasonic waves to the ultrasonic receiver. The ultrasonic waves are received by the ultrasonic receiver, thereby obtaining water flow information in the detection lumen. Compared with existing ultrasonic sensors, the present application can reduce the probability of reduced water flow detection accuracy due to impurities in the water remaining in the detection tube body.

[0009] Optionally, the detection tube body is provided with a first installation groove for installing the first reflector and a first clamping groove connected to the first installation groove at the bottom of the first tube cavity; the detection tube body is provided with a second installation groove for installing the second reflector and a second clamping groove connected to the second installation groove at the bottom of the second tube cavity; the bottom of the first reflector has a first installation block for cooperating with the first installation groove and a first clamping block for cooperating with the first clamping groove; the bottom of the second reflector has a second installation block for cooperating with the second installation groove and a second clamping block for cooperating with the second clamping groove.

[0010] By adopting the above technical solution, when the first reflector is installed in the first tube cavity, the first mounting block at the bottom of the first reflector is snap-fitted with the first mounting groove of the first tube cavity, and the first snap-fitting block is snap-fitted with the first snap-fitting groove; when the second reflector is installed in the second tube cavity, the second mounting block at the bottom of the second reflector is snap-fitted with the second mounting groove of the second tube cavity, and the second snap-fitting block is snap-fitted with the second snap-fitting groove; this helps to improve the stability of the first reflector installed in the first tube cavity and the stability of the second reflector installed in the second tube cavity.

[0011] Optionally, the first reflector is provided with a first inclined surface arranged upwardly on a side facing away from the water flow direction, and the second reflector is provided with a second inclined surface arranged downwardly on a side facing the water flow direction.

[0012] By adopting the above technical solution, the arrangement of the first inclined surface and the second inclined surface makes it difficult for impurities in the water to remain on the first reflector and the second reflector without affecting the flow of water through the first reflector and the second reflector.

[0013] Optionally, a first cavity is defined on the bottom surface of the first reflector, and the bottom surface of the first mounting groove covers the bottom opening of the first cavity; a second cavity is defined on the bottom surface of the second reflector, and the bottom surface of the second mounting groove covers the bottom opening of the second cavity.

[0014] By adopting the above technical solution, the provision of the first cavity and the second cavity can reduce the weight of the first reflector and the second reflector.

[0015] Optionally, the width of the first reflecting surface is 80% to 95% of the width of the detection lumen; the width of the second reflecting surface is 80% to 95% of the width of the detection lumen.

[0016] By adopting the above technical solution, by limiting the width of the first reflecting surface, the second reflecting surface and the detection cavity, it helps to ensure that the water flow in the detection cavity is fully in contact with the ultrasonic wave, thereby helping to improve the detection accuracy of the ultrasonic water flow sensor for water flow.

[0017] Optionally, the first joint is provided with a first mounting hole along the axial direction for arranging the ultrasonic transmitter head, and a first locking plate is provided at the top of the first joint for locking the ultrasonic transmitter head in the first mounting hole; the second joint is provided with a second mounting hole along the axial direction for arranging the ultrasonic transmitter head, and a second locking plate is provided at the top of the second joint for locking the ultrasonic transmitter head in the second mounting hole.

[0018] By adopting the above technical solution, a mounting structure for an ultrasonic transmitter and a first connector, and a mounting structure for an ultrasonic receiver and a second connector are disclosed. The first locking plate and the second locking plate can respectively lock the ultrasonic transmitter and the ultrasonic receiver in the first mounting hole and the second mounting hole, thereby helping to reduce the probability of the ultrasonic transmitter and the ultrasonic receiver being ejected from the detection tube due to excessive water pressure.

[0019] Optionally, the first joint is provided with three first threaded holes along the circumference, and the first locking plate has a first through hole corresponding to the three first threaded holes one by one; the second joint is provided with three second threaded holes along the circumference, and the second locking plate has a second through hole corresponding to the three second threaded holes one by one.

[0020] By adopting the above technical solution, the cooperation between the three first threaded holes and the three first through holes helps to improve the strength of the first locking plate in locking the ultrasonic transmitting head to the first mounting hole after the screws are installed in the three first screw holes; the cooperation between the three second threaded holes and the three second through holes helps to improve the strength of the second locking plate in locking the ultrasonic receiving head to the second mounting hole after the screws are installed in the three second screw holes.

[0021] Optionally, a first sealing through-hole is provided on the side wall of the first mounting hole, and the ultrasonic transmitting head is further provided with a first rubber ring that abuts against the first sealing through-hole, and a first clamping ring for pressing the first rubber ring against the first sealing through-hole is circumferentially provided on the outer wall of the ultrasonic transmitting head; a second sealing through-hole is provided on the side wall of the second mounting hole, and the ultrasonic receiving head is further provided with a second rubber ring that abuts against the second sealing through-hole, and a second clamping ring for pressing the second rubber ring against the second sealing through-hole is circumferentially provided on the outer wall of the ultrasonic transmitting head.

[0022] By adopting the above technical solution, the cooperation between the first rubber ring and the first sealing through hole can reduce the probability of water overflowing from the first mounting hole when flowing through the first tube cavity, and the first clamping ring can press the first rubber ring tightly into the first sealing through hole, which can further improve the sealing effect of the first mounting hole; the cooperation between the second rubber ring and the second sealing through hole can reduce the probability of water overflowing from the second mounting hole when flowing through the second tube cavity, and the second clamping ring can press the second rubber ring tightly into the second sealing through hole, which can further improve the sealing effect of the second mounting hole.

[0023] Optionally, a reinforced grid structure is arranged on the outer surface of the detection tube body.

[0024] By adopting the above technical solution, the arrangement of the reinforced grid structure helps to improve the structural strength of the detection tube body.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. An ultrasonic water flow sensor, comprising a first lumen, a detection lumen, and a second lumen provided in a detection tube body, with a first reflector installed in the first lumen and a second reflector installed in the second lumen. When water flows from the first lumen and passes through the detection lumen to the second lumen, ultrasonic waves emitted by an ultrasonic transmitter are reflected by the first reflective surface into the detection lumen, and after passing through the detection lumen, are reflected by the second reflective surface to the ultrasonic receiver, thereby acquiring water flow detection data. Compared to existing ultrasonic sensors, the present invention can reduce the probability of reduced water flow detection accuracy due to impurities in the water remaining in the detection tube body.

[0027] 2. By providing a first mounting groove and a first clamping groove in the first tube cavity, the first reflector has ideal stability when installed in the first tube cavity; by providing a second mounting groove and a second clamping groove in the second tube cavity, the second reflector has ideal stability when installed in the second tube cavity;

[0028] 3. By limiting the ratio of the width of the first reflecting surface and the width of the second reflecting surface to the width of the detection lumen, water can fully contact the ultrasonic wave when flowing through the detection lumen, thereby helping to improve detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of an existing ultrasonic water flow sensor.

[0030] Figure 2 It is a cross-sectional schematic diagram of an existing ultrasonic water flow sensor.

[0031] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0032] Figure 4 It is a cross-sectional schematic diagram of the detection tube body in the embodiment of the present application.

[0033] Figure 5 It is a cross-sectional schematic diagram of the overall structure of an embodiment of the present application.

[0034] Figure 6 yes Figure 4 A partial enlarged view of point A in the middle.

[0035] Figure 7 It is an exploded schematic diagram of the first connector and the ultrasonic transmitter in the embodiment of the present application.

[0036] Figure 8 yes Figure 4 A partial enlarged view of point B in the middle.

[0037] Figure 9It is an exploded schematic diagram of the second connector and the ultrasonic receiving head in the embodiment of the present application.

[0038] 1. Detection tube body; 11. Detection inner tube; 111. Inner tube socket; 112. Built-in cavity; 12. First tube cavity; 121. First mounting groove; 122. First clamping groove; 13. Detection tube cavity; 14. Second tube cavity; 141. Second mounting groove; 142. Second clamping groove; 15. First guide surface; 151. Detection inlet; 16. Second guide surface; 161. Detection outlet; 17. Reinforced grille structure; 171. First reinforcing rib; 172. Second reinforcing rib; 18. First joint; 181. First mounting hole; 1811. First arrangement through hole; 1812. First sealing through hole; 1813. First clamping through hole; 182. First locking plate; 1821. First mounting through hole; 1822. First through hole; 183. First threaded hole; 19. Second joint; 191. Second mounting hole; 1911. First 1. Arrangement of through holes; 1912. Second sealing through hole; 1913. Second snap-fit ​​through hole; 192. Second locking plate; 1921. Second mounting through hole; 1922. Second through hole; 193. Second threaded hole; 2. Ultrasonic transmitter; 21. First snap ring; 3. Ultrasonic receiver; 31. Second snap ring; 4. Reflection assembly; 44. First reflector; 441. First reflector body; 4411. First inclined plane; 442. First reflector plate; 4421. First reflective surface; 443. First mounting block; 444. First snap-fit ​​block; 445. First cavity; 45. Second reflector; 451. Second reflector body; 4511. Second inclined plane; 452. Second reflector plate; 4521. Second reflective surface; 453. Second mounting block; 454. Second snap-fit ​​block; 455. Second cavity; 5. First rubber ring; 6. Second rubber ring. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-9 This application is described in further detail.

[0040] The embodiment of the present application discloses an ultrasonic water flow sensor.

[0041] Reference Figure 3 An ultrasonic water flow sensor includes a detection tube body 1, an ultrasonic transmitter head 2, an ultrasonic receiver head 3 and a reflection component 4 installed in the detection tube body 1.

[0042] Reference Figure 3 and Figure 4The detection tube body 1 is provided with a first lumen 12, a detection lumen 13, and a second lumen 14 in sequence along the direction of water flow. The first lumen 12, the detection lumen 13, and the second lumen 14 form an integrated through-cavity structure. A first guide surface 15 is formed between the first lumen 12 and the detection lumen 13, and a second guide surface 16 is formed between the second lumen 14 and the detection lumen 13. A detection inlet 151 is provided in the middle of the first guide surface 15, and a detection outlet 161 is provided in the middle of the second guide surface 16. In order to improve the structural strength of the detection tube body 1, a reinforcement grid structure 17 is arranged on the surface of the detection tube body 1. The reinforcement grid structure 17 includes a plurality of circumferentially and spaced first reinforcement ribs 171 and a plurality of second reinforcement ribs 172 parallel to the axial direction of the detection tube body 1 and connected to the first reinforcement ribs 171. The top of the detection tube body 1 is provided with a first joint 18 for installing the ultrasonic transmitter 2 and a second joint 19 for installing the ultrasonic receiver 3.

[0043] Reference Figure 5 and Figure 6 The first connector 18 defines a first mounting hole 181 along the axial direction, communicating with the first lumen 12 and for mounting the ultrasonic transmitter 2. From bottom to top, the first mounting hole 181 includes a first mounting hole 1811, a first sealing hole 1812, and a first snap-fit ​​hole 1813. To ensure that the ultrasonic transmitter 2 remains upright when mounted within the first mounting hole 181 and to enhance structural strength, a first snap ring 21 is circumferentially provided on the outer wall of the ultrasonic transmitter 2 for snapping into the first snap-fit ​​hole 1813. When the ultrasonic transmitter 2 is mounted within the first mounting hole 181, the bottom of the first snap ring 21 abuts against the bottom of the first snap-fit ​​hole 1813. To enhance the sealing performance of the ultrasonic transmitter 2 within the first mounting hole 181, the ultrasonic transmitter 2 is also fitted with a first rubber ring 5 for abutting the first sealing hole 1812. The first snap ring 21 compresses the first rubber ring 5 tightly within the first sealing hole 1812.

[0044] Reference Figure 5 and Figure 7The top of the first connector 18 is also provided with a first locking plate 182 for locking the ultrasonic transmitter 2 within the first mounting hole 181. The first locking plate 182 also defines a first mounting through-hole 1821 for the top of the ultrasonic transmitter 2 to pass through. To enhance the locking strength of the first locking plate 182 in locking the ultrasonic transmitter 2 within the first mounting hole 181, the first connector 18 is circumferentially provided with three first threaded holes 183. The first locking plate 182 has first through-holes 1822 that mate with the three first threaded holes 183. Bolts are passed through the first through-holes 1822 and installed within the first threaded holes 183, thereby securing the first locking plate 182 to the first connector 18. When the first locking plate 182 is installed on the top of the first connector 18, the bottom of the first locking plate 182 abuts against the top of the first clamping ring 21, thereby locking the ultrasonic transmitter 2 within the first mounting hole 181.

[0045] Reference Figure 5 and Figure 8 The second connector 19 defines a second mounting hole 191 along the axial direction, communicating with the second lumen 14 and for mounting the ultrasonic receiving head 3. From bottom to top, the second mounting hole 1911 comprises a second mounting hole 1911, a second sealing hole 1912, and a second snap-fit ​​hole 1913. To ensure that the ultrasonic receiving head 3 remains upright when mounted within the second hole 1922 and to enhance structural strength, a second snap ring 31 is circumferentially provided on the outer wall of the ultrasonic receiving head 3 for snapping into the second snap-fit ​​hole 1913. When the ultrasonic receiving head 3 is mounted within the second hole 1922, the bottom of the second snap ring 31 abuts against the bottom of the second snap-fit ​​hole 1913. To enhance the sealing performance of the ultrasonic receiving head 3 within the second hole 1922, the ultrasonic receiving head 3 is also fitted with a second rubber ring 6 for abutting against the second sealing hole 1912. The second snap ring 31 compresses the second rubber ring 6 tightly within the second sealing hole 1912.

[0046] Reference Figure 4 and Figure 9The top of the second connector 19 is also provided with a second locking plate 192 for locking the ultrasonic receiving head 3 within the second mounting hole 191. The second locking plate 192 also defines a second mounting through-hole 1921 for the top of the ultrasonic receiving head 3 to pass through. To enhance the locking strength of the second locking plate 192 in locking the ultrasonic receiving head 3 within the second mounting hole 191, the second connector 19 is circumferentially provided with three second threaded holes 193. The second locking plate 192 has second through-holes 1922 that mate with the three second threaded holes 193. Bolts are passed through the second through-holes 1922 and installed in the second threaded holes 193, thereby securing the second locking plate 192 to the second connector 19. When the second locking plate 192 is installed on the top of the second connector 19, the bottom of the second locking plate 192 abuts against the top of the second clamping ring 31, thereby locking the ultrasonic receiving head 3 within the second mounting hole 191.

[0047] Reference Figure 5 The reflective assembly 4 includes a first reflective component 44 installed in the first tube cavity 12 and a second reflective component 45 installed in the second tube cavity 14.

[0048] Reference Figure 3 and Figure 5 The first reflector 44 includes a first reflective body 441, a first reflective plate 442 mounted on the side of the first reflective body 441 facing the water flow direction, a first mounting block 443 disposed on the underside of the first reflective body 441, and a first clamping block 444 connected to the end of the first mounting block 443 facing the water flow direction. The first reflective plate 442 is located below the ultrasonic transmitter 2 and has a first reflective surface 4421 for reflecting ultrasonic waves emitted by the ultrasonic transmitter 2 toward the detection inlet 151. The first reflective surface 4421 forms an angle of 45° with the axis of the ultrasonic transmitter 2, and the width of the first reflective surface 4421 is between 80% and 95% of the width of the detection lumen 13. In this embodiment, the width of the first reflective surface 4421 is 95% of the width of the detection lumen 13.

[0049] Reference Figure 4 and Figure 5 To allow the first reflector 44 to be removably mounted within the first lumen 12, the detection tube body 1 defines a first mounting groove 121 and a first engaging groove 122 at the bottom of the first lumen 12 for engaging the first mounting block 443 and the first engaging block 444. This allows the first mounting block 443 and the first engaging block 444 to be inserted into the first mounting groove 121 and the first engaging groove 122 in the direction of water flow. The first reflector 44 defines a first cavity 445 on the bottom surface of the first mounting block 443, and the bottom surface of the first mounting groove 121 covers the bottom opening of the first cavity 445.

[0050] Reference Figure 5 and Figure 7 In order to reduce the probability of impurities in the water remaining on the first reflector 44 without affecting the flow of water into the detection tube cavity 13, the first reflective body 441 is provided with a first inclined surface 4411 arranged upward on the side facing away from the water flow direction, so that water can enter the detection tube cavity 13 after being guided by the first inclined surface 4411.

[0051] Reference Figure 5 and Figure 9 The second reflector 45 includes a second reflective body 451, a second reflective plate 452 mounted on the side of the second reflective body 451 facing away from the water flow, a second mounting block 453 disposed on the underside of the second reflective body 451, and a second clamping block 454 connected to the end of the second mounting block 453 facing away from the water flow. The second reflective plate 452 is located below the ultrasonic receiving head 3 and has a second reflective surface 4521 for reflecting ultrasonic waves reflected by the first reflective surface 4421 back to the ultrasonic receiving head 3. The second reflective surface 4521 forms an angle of 45° with the axis of the ultrasonic receiving head 3, and the width of the second reflective surface 4521 is between 80% and 95% of the width of the detection lumen 13. In this embodiment, the width of the second reflective surface 4521 is 95% of the width of the detection lumen 13.

[0052] Reference Figure 4 and Figure 5 To allow the second reflector 45 to be removably mounted within the second lumen 14, the detection tube body 1 defines a second mounting groove 141 and a second engaging groove 142 at the bottom of the second lumen 14 for engaging with the second mounting block 453 and the second engaging block 454. This allows the second mounting block 453 and the second engaging block 454 to be inserted into the second mounting groove 141 and the second engaging groove 142 in the direction of water flow. The second reflector 45 defines a second cavity 455 on the bottom surface of the second mounting block 453, and the bottom surface of the second mounting groove 141 covers the bottom opening of the second cavity 455.

[0053] Reference Figure 5 and Figure 9 In order to reduce the probability of impurities in the water remaining on the second reflective member 45 without affecting the flow of water into the detection tube cavity 13, the second reflective body 451 is provided with a second inclined surface 4511 arranged upward on the side facing away from the water flow direction, so that water can enter the detection tube cavity 13 after being guided by the second inclined surface 4511.

[0054] Combine Figures 3 to 9The implementation principle of an ultrasonic water flow sensor in an embodiment of the present application is as follows: when water flows into the first tube cavity 12, flows through the detection tube cavity 13 to the second tube cavity 14 and flows out of the second tube cavity 14, the first reflection surface 4421 reflects the ultrasonic wave emitted by the ultrasonic transmitting head 2 to the detection tube cavity 13, and after passing through the detection tube cavity 13, it is reflected by the second reflection surface 4521 to the ultrasonic receiving head 3, thereby being able to obtain the flow data of the water in the detection tube cavity 13.

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An ultrasonic water flow sensor, characterized in that: The invention comprises a detection tube body (1), an ultrasonic transmitter (2), an ultrasonic receiver (3) and a reflective assembly (4) installed in the detection tube body (1); the detection tube body (1) comprises a first tube cavity (12), a detection tube cavity (13) and a second tube cavity (14) in sequence along the water flow direction; a first guide surface (15) and a detection inlet (151) located in the middle of the first guide surface (15) are formed between the first tube cavity (12) and the detection tube cavity (13); a second guide surface (16) and a detection outlet (161) located in the middle of the second guide surface (16) are formed between the second tube cavity (14) and the detection tube cavity (13); the detection tube body (1) has a plurality of channels for the ultrasonic transmitter (2) to pass through the detection tube cavity (13); and a plurality of channels are provided for the ultrasonic transmitter (2) to pass through the detection tube cavity (13). ) is installed in and communicated with the first tube cavity (12) and a second connector (19) for the ultrasonic receiving head (3) to be installed and communicated with the second tube cavity (14); the reflecting assembly (4) includes a first reflecting member (44) installed in the first tube cavity (12) and a second reflecting member (45) installed in the second tube cavity (14); the first reflecting member (44) has a first reflecting surface (4421) for transmitting the ultrasonic wave emitted by the ultrasonic transmitting head (2) to the detection entrance (151); the second reflecting member (45) has a second reflecting surface (4521) for reflecting the ultrasonic wave reflected by the first reflecting surface (4421) to the ultrasonic receiving head (3).

2. The ultrasonic water flow sensor according to claim 1, characterized in that: The detection tube body (1) is provided with a first installation groove (121) for installing the first reflective member (44) and a first clamping groove (122) connected to the first installation groove (121) at the bottom of the first tube cavity (12); the detection tube body (1) is provided with a second installation groove (141) for installing the second reflective member (45) and a second clamping groove (142) connected to the second installation groove (141) at the bottom of the second tube cavity (14); the first reflective member (44) has a first installation block (443) for cooperating with the first installation groove (121) and a first clamping block (444) for cooperating with the first clamping groove (122) at the bottom; the second reflective member (45) has a second installation block (453) for cooperating with the second installation groove (141) and a second clamping block (454) for cooperating with the second clamping groove (142) at the bottom.

3. The ultrasonic water flow sensor according to claim 2, characterized in that: The first reflector (44) is provided with a first inclined surface (4411) arranged upwardly tilted on a side facing away from the water flow direction, and the second reflector (45) is provided with a second inclined surface (4511) arranged downwardly tilted on a side facing the water flow direction.

4. The ultrasonic water flow sensor according to claim 3, characterized in that: A first cavity (445) is formed on the bottom surface of the first reflective member (44), and the bottom surface of the first mounting groove (121) covers the bottom opening of the first cavity (445); a second cavity (455) is formed on the bottom surface of the second reflective member (45), and the bottom surface of the second mounting groove (141) covers the bottom opening of the second cavity (455).

5. The ultrasonic water flow sensor according to claim 1, characterized in that: The width of the first reflecting surface (4421) is 80% to 95% of the width of the detection lumen (13); and the width of the second reflecting surface (4521) is 80% to 95% of the width of the detection lumen (13).

6. The ultrasonic water flow sensor according to claim 1, characterized in that: The first joint (18) is provided with a first mounting hole (181) for arranging the ultrasonic transmitter (2) along the axial direction, and a first locking plate (182) for locking the ultrasonic transmitter (2) in the first mounting hole (181) is provided at the top of the first joint (18); the second joint (19) is provided with a second mounting hole (191) for arranging the ultrasonic transmitter (2) along the axial direction, and a second locking plate (192) for locking the ultrasonic transmitter (2) in the second mounting hole (191) is provided at the top of the second joint (19).

7. The ultrasonic water flow sensor according to claim 6, characterized in that: The first joint (18) is provided with three first threaded holes (183) along the circumferential direction, and the first locking plate (182) has a first through hole (1822) corresponding one-to-one to the three first threaded holes (183); the second joint (19) is provided with three second threaded holes (193) along the circumferential direction, and the second locking plate (192) has a second through hole (1922) corresponding one-to-one to the three second threaded holes (193).

8. The ultrasonic water flow sensor according to claim 6, characterized in that: The side wall of the first mounting hole (181) is provided with a first sealing through hole (1812), the ultrasonic transmitting head (2) is also provided with a first rubber ring (5) that is in contact with the first sealing through hole (1812), and the outer wall of the ultrasonic transmitting head (2) is circumferentially provided with a first snap ring (21) for pressing the first rubber ring (5) against the first sealing through hole (1812); the side wall of the second mounting hole (191) is provided with a second sealing through hole (1912), the ultrasonic receiving head (3) is also provided with a second rubber ring (6) that is in contact with the second sealing through hole (1912), and the outer wall of the ultrasonic transmitting head (2) is circumferentially provided with a second snap ring (31) for pressing the second rubber ring (6) against the second sealing through hole (1912).

9. The ultrasonic water flow sensor according to claim 1, characterized in that: A reinforced grid structure (17) is arranged on the outer surface of the detection tube body (1).

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