Water meter measuring tube and ultrasonic water meter

Abstract

A water meter measuring pipe comprises a metering outer pipe provided with a first detection opening and a second detection opening and a flow guide assembly contained in the metering outer pipe, the flow guide assembly comprises a flow guide sleeve and a flow guide pipe, and the flow guide sleeve comprises a connecting plate with the cross section of a C-shaped structure, a first reflection fixing piece and a second reflection fixing piece, the inner side of the connecting plate corresponds to the first and second detection ports; the first reflection fixing piece is provided with a first limiting groove which forms an angle of 45 degrees with the axial direction of the metering outer pipe and is used for placing a first ultrasonic reflection plate, the second reflection fixing piece is provided with a second limiting groove which forms an angle of 45 degrees with the axial direction of the metering outer pipe and is used for placing a second ultrasonic reflection plate, and a reflection detection area is formed between the first ultrasonic reflection plate and the second ultrasonic reflection plate; the flow guide pipe is located in the reflection detection area and clamped with the connecting plate, the outer side faces of the flow guide pipe and the connecting plate abut against the inner wall of the overflowing channel, and the projection distance of the first detection opening and the second detection opening in the axial direction of the metering outer pipe is larger than the length of the flow guide pipe. The utility model further discloses an ultrasonic water meter comprising the water meter measuring tube.

Description

Technical Field

[0001] The utility model relates to the technical field of flow measurement, in particular to a water meter measuring pipe and an ultrasonic water meter. Background Art

[0002] An ultrasonic water meter is a new type of water meter that detects the time difference generated by the change in the speed of an ultrasonic beam when it propagates downstream and upstream in water, analyzes and processes it to obtain the water flow velocity, and then further calculates the water flow rate. It has the characteristics of low starting flow velocity, wide range ratio, high measurement accuracy, and stable operation. It can solve the problems of insufficient detection ability of traditional water meters for small flow rates and the influence of detection components by impurities in water, significantly improving the accuracy of water flow detection and extending the service life of the water meter. The measurement accuracy of an ultrasonic water meter is mainly determined by the range ratio of the metering pipe inside it. However, at present, most of the metering pipes of ultrasonic water meters on the market are integrally designed and installed inside the pipe body, and it is difficult to remove the metering pipe from the pipe body. Therefore, the metering pipe of the ultrasonic water meter has a fixed range. When low-flow or high-flow fluids flow through the pipe body, the measurement accuracy of the water meter is insufficient. Therefore, when operators need to meet the measurement accuracy under different flow conditions, they often need to select ultrasonic water meters equipped with metering pipes of different ranges for measurement. In this way, the flow measurement cost will increase. Summary of the Utility Model

[0003] Based on this, in view of the above deficiencies, it is necessary to provide a water meter measuring pipe and an ultrasonic water meter with a detachable metering pipe that can reduce the measurement cost under different flows.

[0004] A water meter measuring pipe includes a metering outer pipe. Both ends of the metering outer pipe are through, and a flow passage is formed inside the metering outer pipe. First detection ports and second detection ports are spaced apart on the outer surface of the metering outer pipe along the length direction of the metering outer pipe. The first detection port and the second detection port are respectively communicated with the flow passage. The water meter measuring pipe further includes a diversion assembly, and the diversion assembly includes:

[0005] A diversion sleeve is received in the flow passage. It includes a connecting plate with a C-shaped cross-section, a first reflection fixing member fixed at one end of the connecting plate, and a second reflection fixing member fixed at the other end of the connecting plate. The outer side of the connecting plate abuts against the inner wall of the flow passage, and the inner side of the connecting plate corresponds to the first detection port and the second detection port. A first limiting groove at an angle of 45° with the axial direction of the metering outer pipe is provided on the first reflection fixing member, and a first ultrasonic reflection plate corresponding to the first detection port is fixed in the first limiting groove. A second limiting groove at an angle of 45° with the axial direction of the metering outer pipe is provided on the second reflection fixing member, and a second ultrasonic reflection plate corresponding to the second detection port is fixed in the second limiting groove. A reflection detection area is formed between the first ultrasonic reflection plate and the second ultrasonic reflection plate;

[0006] A diversion pipe is received in the flow-through channel and located in the reflection detection area. The diversion pipe is clamped to the inner side surface of the connecting plate, and the outer surface of the diversion pipe on the side facing away from the connecting plate abuts against the inner wall of the flow-through channel. The distance from the projection of the first detection port in the axial direction of the metering outer pipe to the projection of the second detection port in the axial direction of the metering outer pipe is greater than the length of the diversion pipe.

[0007] In one embodiment, at least one positioning hole or positioning groove is spaced apart on the portion of the connecting plate that abuts against the inner wall of the flow-through channel. At least one insertion pin corresponding to the positioning hole or positioning groove is provided on the outer surface of the diversion pipe, and the height of the insertion pin is not greater than the depth of the positioning hole or positioning groove.

[0008] In one embodiment, at least one bayonet is provided on each of the two opposite side walls of the connecting plate. At least one clamping block corresponding to each bayonet is provided on the outer surface of the diversion pipe, and the surface of the clamping block that contacts the inner wall of the flow-through channel is an arc surface.

[0009] In one embodiment, a first limiting notch is provided at one end of the connecting plate adjacent to the first reflection fixing member, and a second limiting notch is provided at one end of the connecting plate adjacent to the second reflection fixing member. A first C-shaped retaining ring is provided at one end of the diversion pipe, and a second C-shaped retaining ring is provided at the other end of the diversion pipe. The two end faces of the first C-shaped retaining ring are respectively clamped and limited with the two side edges of the first limiting notch, and the two end faces of the second C-shaped retaining ring are respectively clamped and limited with the two side edges of the second limiting notch.

[0010] In one embodiment, the first C-shaped retaining ring and the second C-shaped retaining ring are integrally formed with the diversion pipe.

[0011] In one embodiment, the first C-shaped retaining ring and the second C-shaped retaining ring are respectively clamped on the diversion pipe, and a connecting rod extending along the length direction of the diversion pipe and fixedly connected to the first C-shaped retaining ring and the second C-shaped retaining ring respectively is further provided on the outer side of the diversion pipe.

[0012] In one embodiment, an installation area is formed between the first detection port and the second detection port in the flow-through channel. The water inlet end or the water outlet end of the metering outer pipe forms an installation port of the diversion assembly. The inner diameter of the installation area gradually increases in the direction close to the installation port, and the maximum inner diameter of the installation area is greater than the sum of the outer diameter of the diversion pipe and the thickness of the connecting plate, and the minimum inner diameter of the installation area is less than the sum of the outer diameter of the diversion pipe and the thickness of the connecting plate.

[0013] In one embodiment, the water meter measuring pipe further includes a rectifier, which is located between the water inlet end of the metering outer pipe and the diversion sleeve and abuts against the inner wall of the flow-through channel. A plurality of rectifying holes are provided on the rectifier.

[0014] In one embodiment, a limiting step is provided on the inner wall of the flow-through channel, and the rectifier abuts against the limiting step.

[0015] The utility model also discloses an ultrasonic water meter, which comprises the water meter measuring tube.

[0016] When implementing the water meter measuring tube and ultrasonic water meter of the utility model, the guide sleeve is embedded in the metering outer tube, and the guide tube is clamped in the guide sleeve to realize the assembly and cooperation of the guide tube and the guide sleeve. The guide sleeve and the guide tube are respectively abutted against the inner wall of the metering outer tube to realize the fixation of the guide assembly in the metering outer tube. When it is necessary to replace the guide tube of different ranges, it is only necessary to pull the guide sleeve out of the metering outer tube, clamp the new guide tube on the guide sleeve, and push the guide tube into the metering outer tube again. The assembly and disassembly operations are simple. When equipped with multiple guide tubes of different ranges, only a single water meter measuring tube is required to meet the precise measurement under different flow rates, thereby reducing the measurement cost under different flow rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a water meter measuring tube in one embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of a water meter measuring tube in one embodiment of the utility model;

[0019] Figure 3 This is a schematic structural diagram of a flow guide assembly in one embodiment of the utility model;

[0020] Figure 4 This is a schematic structural diagram of a guide sleeve in an embodiment of the utility model;

[0021] Figure 5 It is a schematic structural diagram of a flow guide tube in one embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0023] Please combine Figures 1-5, the present utility model discloses a water meter measuring pipe with a detachable measuring pipe that can reduce the measurement cost at different flow rates. The water meter measuring pipe 10 includes a measuring outer pipe 100. Both ends of the measuring outer pipe 100 are through, and a flow passage 110 is formed inside the measuring outer pipe 100. That is to say, the flow passage 110 penetrates through one end of the measuring outer pipe 100 to form a water inlet end 120, and the flow passage 110 penetrates through the other end of the measuring outer pipe 100 to form a water outlet end 130. A first detection port 140 and a second detection port 150 are spaced apart along the length direction of the measuring outer pipe 100 on the outer surface of the measuring outer pipe 100. The first detection port 140 and the second detection port 150 are respectively communicated with the flow passage 110. A first installation pipe 160 is provided at the first detection port 140 on the outside of the measuring outer pipe 100, and a first ultrasonic transducer is installed at the first installation pipe 160. A second installation pipe 170 is provided at the second detection port 150 on the outside of the measuring outer pipe 100, and a second ultrasonic transducer is installed at the second installation pipe 170.

[0024] The water meter measuring pipe 10 further includes a flow guiding assembly 200. The flow guiding assembly 200 includes a flow guiding sleeve 210 and a flow guiding pipe 220. The flow guiding sleeve 210 is received in the flow passage 110. The flow guiding sleeve 210 includes a connecting plate 211 with a C-shaped cross-section, a first reflection fixing member 212 fixed at one end of the connecting plate 211, and a second reflection fixing member 213 fixed at the other end of the connecting plate 211. The outer side surface of the connecting plate 211 abuts against the inner wall of the flow passage 110, and the inner side of the connecting plate 211 corresponds to the first detection port 140 and the second detection port 150. A first limiting groove 214 at an angle of 45° with the axis of the metering outer pipe 100 is provided on the first reflection fixing member 212, and a first ultrasonic reflection plate 215 corresponding to the first detection port 140 is fixed in the first limiting groove 214. A second limiting groove 216 at an angle of 45° with the axis of the metering outer pipe 100 is provided on the second reflection fixing member 213, and a second ultrasonic reflection plate 217 corresponding to the second detection port 150 is fixed in the second limiting groove 216. A reflection detection area 218 is formed between the first ultrasonic reflection plate 215 and the second ultrasonic reflection plate 217. That is to say, the first ultrasonic reflection plate 215 and the second ultrasonic reflection plate 217 are symmetrically arranged, and the distance between the two gradually increases in the direction close to the side of the metering outer pipe 100 where the first detection port 140 and the second detection port 150 are located. In this embodiment, the connecting plate 211 is formed by bending the two sides of a flat plate body towards the middle. The inner side of the connecting plate 211 is the area surrounded by the two sides of the connecting plate 211 after bending. The inner side surface of the connecting plate 211 is the inner concave arc surface located on the inner side of the connecting plate 211. On the contrary, the outer side surface of the connecting plate 211 is the outer convex arc surface. It can be understood that in this embodiment, the opening formed by bending the two sides of the connecting plate 211 faces the side of the metering outer pipe 100 where the first detection port 140 and the second detection port 150 are located. Thus, the inner side surface of the connecting plate 211, the first reflection fixing member 212, and the second reflection fixing member 213 jointly enclose the reflection detection area 218.

[0025] The diversion pipe 220 is received in the flow-through channel 110 and located within the reflection detection area 218. The diversion pipe 220 is snap-connected to the inner side surface of the connection plate 211 to fix the diversion pipe 220 on the diversion sleeve 210, and the outer surface of the diversion pipe 220 on the side facing away from the connection plate 211 abuts against the inner wall of the flow-through channel 110. That is to say, after the diversion pipe 220 and the diversion sleeve 210 are assembled to form the diversion assembly 200 and the diversion assembly 200 is inserted into the inner cavity of the metering outer pipe 100, the diversion assembly 200 is positioned within the metering outer pipe 100 by the limiting abutment of the connection plate 211 against the inner wall of the flow-through channel 110 and the limiting abutment of the diversion pipe 220 against the inner wall of the flow-through channel 110, so as to prevent the diversion assembly 200 from loosening. Further, in this embodiment, the projection distance of the first detection port 140 in the axial direction of the metering outer pipe 100 to the projection of the second detection port 150 in the axial direction of the metering outer pipe 100 is greater than the length of the diversion pipe 220. That is to say, the diversion pipe 220 is located in the area between the first detection port 140 and the second detection port 150 to avoid interference with the transmission and reception of ultrasonic waves by the diversion pipe 220.

[0026] When the water meter measuring pipe 10 of this embodiment is in use, the water to be detected flows through the diversion pipe 220. After the ultrasonic wave emitted by the first ultrasonic transducer is reflected by the first ultrasonic reflector 215, it is transmitted along the length direction of the metering outer pipe 100 to the second ultrasonic reflector 217, and is reflected twice at the second ultrasonic reflector 217, and then is led out from the radial direction of the metering outer pipe 100 through the second detection port 150 and received by the second ultrasonic transducer, and the time t1 from the emission of the ultrasonic wave by the first ultrasonic transducer to the reception of the ultrasonic wave by the second ultrasonic transducer is calculated. At the same time, the ultrasonic wave emitted by the second ultrasonic transducer is reflected by the second ultrasonic reflector 217, then transmitted along the length direction of the metering outer pipe 100 to the first ultrasonic reflector 215, and is reflected twice at the first ultrasonic reflector 215, and then is led out from the radial direction of the metering outer pipe 100 through the first detection port 140 and received by the first ultrasonic transducer, and the time t2 from the emission of the ultrasonic wave by the second ultrasonic transducer to the reception of the ultrasonic wave by the first ultrasonic transducer is calculated. The flow rate of the water is calculated by calculating the time difference between t1 and t2, and then the water flow in the diversion pipe 220 can be converted.

[0027] To improve the stability of the diversion component 200 installed in the metering outer pipe 100, in one embodiment, an installation area is formed between the first detection port 140 and the second detection port 150 in the flow-through channel 110. The water inlet end 120 or the water outlet end 130 of the metering outer pipe 100 forms an installation port for the diversion component 200. The inner diameter of the installation area gradually increases in the direction close to the installation port, and the maximum inner diameter of the installation area is greater than the sum of the outer diameter of the diversion pipe 220 and the thickness of the connection plate 211, and the minimum inner diameter of the installation area is less than the sum of the outer diameter of the diversion pipe 220 and the thickness of the connection plate 211. It can also be understood that the inner wall of the installation area has a certain slope (that is, the angle α between the inner wall of the installation area and the axis of the metering outer pipe 100 is non-zero). When the diversion component 200 is inserted into the flow-through channel 110, as the insertion depth of the diversion component 200 in the flow-through channel 110 increases, the gap between the diversion component 200 and the inner wall of the installation area gradually decreases, so that the acting force of the inner wall of the installation area on the diversion pipe 220 and the connection plate 211 increases, thereby realizing the limit of the diversion component 200 in the installation area and preventing the diversion component 200 from shifting under the impact of water flow.

[0028] Please combine Figures 2-5 , at least one positioning hole 2111 or positioning groove is spaced apart on the portion of the connection plate 211 that abuts against the inner wall of the flow-through channel 110. At least one insertion pin 221 corresponding to the positioning hole 2111 or the positioning groove is provided on the outer surface of the diversion pipe 220. The height of the insertion pin 221 is not greater than the depth of the positioning hole 2111 or the positioning groove. By limiting the height of the insertion pin 221 not to be greater than the depth of the positioning hole 2111 or the positioning groove, interference between the end of the insertion pin 221 and the inner wall of the metering outer pipe 100 can be avoided. Preferably, in this embodiment, two positioning holes 2111 are spaced apart on the connection plate 211, and two insertion pins 221 are spaced apart on the outer surface of the diversion pipe 220. Through the mutual restraint between the insertion pin 221 and the positioning hole 2111, the diversion pipe 220 can be prevented from moving axially along the diversion pipe 220 on the diversion sleeve 210, and at the same time, the guide pipe can be prevented from rotating relative to the diversion sleeve 210. Further, at least one bayonet 2112 is provided on each of the two opposite side walls of the connection plate 211, and at least one locking block 222 corresponding to the bayonet 2112 is provided on the outer surface of the diversion pipe 220. The surface of the locking block 222 that contacts the inner wall of the flow-through channel 110 is an arc surface. By providing the bayonet 2112 on the side wall of the connection plate 211 and providing the locking block 222 on the outer surface of the diversion pipe 220, while restricting the relative rotation between the diversion pipe 220 and the diversion sleeve 210, the diversion pipe 220 can be prevented from disengaging from the opening formed by bending the two sides of the connection plate 211 and entering the reflection detection area 218. In this way, through the clamping of the outer surface of the diversion pipe 220 by the two sides of the connection plate 211, the limit of the insertion pin 221 and the positioning hole 2111, and the limit of the locking block 222 and the bayonet 2112, the stability of the diversion pipe 220 installed on the connection plate 211 can be significantly improved.

[0029] One end of the connecting plate 211 adjacent to the first reflection fixing member 212 is provided with a first limiting notch 2113, and one end of the connecting plate 211 adjacent to the second reflection fixing member 213 is provided with a second limiting notch 2114. The first limiting notch 2113 is correspondingly communicated with the first detection port 140, and the second limiting notch 2114 is correspondingly communicated with the second detection port 150. One end of the diversion pipe 220 is provided with a first C-shaped retaining ring 223, and the other end of the diversion pipe 220 is provided with a second C-shaped retaining ring 224. The two end faces of the first C-shaped retaining ring 223 are respectively and limitingly clamped with the two side edges of the first limiting notch 2113, and the two end faces of the second C-shaped retaining ring 224 are respectively and limitingly clamped with the two side edges of the second limiting notch 2114. By providing the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 at both ends of the diversion pipe 220, secondary limitation of the diversion pipe 220 and the connecting plate 211 is achieved, which can further prevent the diversion pipe 220 from rotating relative to the connecting plate 211. In one embodiment, the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 are integrally formed with the diversion pipe 220. In another embodiment, the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 are respectively clamped on the diversion pipe 220, and a connecting rod 225 extending along the length direction of the diversion pipe 220 and fixedly connected to the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 respectively is further provided on the outer side of the diversion pipe 220. The connecting rod 225 connects the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 into one body, which can prevent the first C-shaped retaining ring 223 and the second C-shaped retaining ring 224 from sliding on the surface of the diversion pipe 220.

[0030] In one embodiment, the water meter measuring pipe 10 further includes a rectifier 300. The rectifier 300 is located between the water inlet end 120 of the metering outer pipe 100 and the diversion sleeve 210 and abuts against the inner wall of the flow passage 110. A plurality of rectifying holes are formed in the rectifier 300. By providing the rectifier 300, after the water flow passes through the rectifier 300, through the shunting effect of the rectifying holes on the water flow, the water flow in a vortex or turbulent state is divided into a plurality of regularly flowing thin streams and enters the diversion pipe 220, so as to improve the reliability of ultrasonic water meter detection. In this embodiment, a limiting step is provided on the inner wall of the flow passage 110, and the rectifier 300 abuts against the limiting step to realize the positioning of the rectifier 300 and prevent the rectifier 300 from shifting in the metering outer pipe 100.

[0031] In addition, the present utility model also discloses an ultrasonic water meter, which includes the above-mentioned water meter measuring pipe. The ultrasonic water meter further includes a first ultrasonic transducer disposed at the first installation pipe 160, a second ultrasonic transducer disposed at the second installation pipe 170, a controller electrically connected to the first ultrasonic transducer and the second ultrasonic transducer, and a display device electrically connected to the controller. The controller controls the first ultrasonic transducer and the second ultrasonic transducer to emit ultrasonic waves respectively, and calculates the water flow velocity and flow rate according to the time difference between the second ultrasonic transducer and the first ultrasonic transducer receiving the ultrasonic waves. The calculation results are transmitted to the display device for display, so that users or staff can understand the water usage situation.

[0032] For the above-mentioned water meter measuring pipe 10 and ultrasonic water meter, the flow guide sleeve 210 is embedded into the metering outer pipe 100, and the flow guide pipe 220 is clamped in the flow guide sleeve 210, so as to realize the assembly and cooperation between the flow guide pipe 220 and the flow guide sleeve 210. Through the abutment of the flow guide sleeve 210 and the flow guide pipe 220 against the inner wall of the metering outer pipe 100 respectively, the fixation of the flow guide assembly 200 in the metering outer pipe 100 is realized. When it is necessary to replace the flow guide pipe 220 with different ranges, only need to pull out the flow guide sleeve 210 from the metering outer pipe 100, clamp the new flow guide pipe 220 on the flow guide sleeve 210, and then push the flow guide pipe 220 back into the metering outer pipe 100. Its assembly and disassembly operations are simple. In the case of being equipped with multiple flow guide pipes 220 with different ranges, only a single water meter measuring pipe 10 is required to meet the accurate measurement under different flows, reducing the measurement cost under different flows.

[0033] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0034] The above-mentioned embodiments only represent several implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A water meter measuring tube, comprising a measuring outer tube, the two ends of the measuring outer tube are connected, and a flow passage is formed in the measuring outer tube, and a first detection port and a second detection port are provided on the outer surface of the measuring outer tube at intervals along the length direction of the measuring outer tube, and the first detection port and the second detection port are respectively connected to the flow passage; characterized in that: Also included is a flow guide component, the flow guide component comprising: A flow guide sleeve, the flow guide sleeve is accommodated in the flow passage, comprising a connecting plate with a C-shaped cross-section, a first reflective fixing member fixed at one end of the connecting plate, and a second reflective fixing member fixed at the other end of the connecting plate; the outer side surface of the connecting plate abuts against the inner wall of the flow passage, and the inner side of the connecting plate corresponds to the first detection port and the second detection port; the first reflective fixing member is provided with a first limiting groove which is at an angle of 45° to the axial direction of the metering outer tube, a first ultrasonic reflecting plate corresponding to the first detection port is fixed in the first limiting groove, the second reflective fixing member is provided with a second limiting groove which is at an angle of 45° to the axial direction of the metering outer tube, a second ultrasonic reflecting plate corresponding to the second detection port is fixed in the second limiting groove, and a reflection detection area is formed between the first ultrasonic reflecting plate and the second ultrasonic reflecting plate; The flow guide tube is accommodated in the flow passage and is located in the reflection detection area. The flow guide tube is clamped with the inner side surface of the connecting plate, and the outer surface of the flow guide tube facing away from the connecting plate is abutted against the inner wall of the flow passage. The distance from the projection of the first detection port on the axial direction of the metering outer tube to the projection of the second detection port on the axial direction of the metering outer tube is greater than the length of the flow guide tube.

2. The water meter measuring tube according to claim 1, characterized in that: At least one positioning hole or positioning groove is provided at intervals on the connecting plate where it abuts against the inner wall of the flow channel, and at least one latch is provided on the outer surface of the flow guide pipe, which is inserted into the positioning hole or positioning groove in a one-to-one correspondence, and the height of the latch is not greater than the depth of the positioning hole or positioning groove.

3. The water meter measuring tube according to claim 1, characterized in that: Two opposite side walls of the connecting plate are each provided with at least one bayonet, and the outer surface of the flow guide pipe is provided with at least one card block correspondingly embedded in each of the bayonet, and the surface of the card block contacting the inner wall of the flow channel is an arc surface.

4. The water meter measuring tube according to claim 1, characterized in that: A first limiting notch is provided on one end of the connecting plate adjacent to the first reflecting fixing piece, a second limiting notch is provided on one end of the connecting plate adjacent to the second reflecting fixing piece, a first C-shaped clamping ring is provided at one end of the guide tube, and a second C-shaped clamping ring is provided at the other end of the guide tube, the two end faces of the first C-shaped clamping ring are respectively limitedly engaged with the two side edges of the first limiting notch, and the two end faces of the second C-shaped clamping ring are respectively limitedly engaged with the two side edges of the second limiting notch.

5. The water meter measuring tube according to claim 4, characterized in that: The first C-shaped clamp ring and the second C-shaped clamp ring are integrally formed with the flow guide tube.

6. The water meter measuring tube according to claim 4, characterized in that: The first C-shaped clamp ring and the second C-shaped clamp ring are respectively clamped on the guide tube. The outer side of the guide tube is also provided with a connecting rod extending along the length direction of the guide tube and fixedly connected to the first C-shaped clamp ring and the second C-shaped clamp ring respectively.

7. The water meter measuring tube according to claim 1, characterized in that: An installation area is formed in the flow channel between the first detection port and the second detection port, and the water inlet end or the water outlet end of the metering outer tube forms an installation port of the guide component. The inner diameter of the installation area gradually increases in the direction approaching the installation port, and the maximum inner diameter of the installation area is greater than the sum of the outer diameter of the guide pipe and the thickness of the connecting plate, and the minimum inner diameter of the installation area is less than the sum of the outer diameter of the guide pipe and the thickness of the connecting plate.

8. The water meter measuring tube according to claim 1, characterized in that: It also includes a rectifier, which is located between the water inlet end of the metering outer tube and the guide sleeve and abuts against the inner wall of the flow passage. The rectifier is provided with a plurality of rectifying holes.

9. The water meter measuring tube according to claim 8, characterized in that: The inner wall of the flow passage is provided with a limiting step, and the rectifier abuts against the limiting step.

10. An ultrasonic water meter, characterized in that: The invention comprises a water meter measuring tube as described in any one of claims 1 to 9.

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