Water meter drive shaft bushing

Abstract

This utility model provides a water meter drive shaft sleeve, including a meter housing. An impeller and a transmission assembly are disposed within the meter housing. The impeller is rotatably mounted within the meter housing, facing the water inlet end. The transmission assembly is located downstream of the impeller. The transmission assembly includes a sleeve body and a transmission shaft disposed within the sleeve body for connecting the output shaft of the impeller to a counter. The side wall of the sleeve body has an inlet hole and a drain hole. The inlet hole faces the impeller and guides water into the interior of the sleeve body, while the drain hole faces away from the impeller and discharges the introduced water. This utility model water meter drive shaft sleeve has a compact structure, is easy to manufacture, and has low cost. It effectively reduces or eliminates the rise of iron filings or other particles to the magnet, effectively protecting the magnet, ensuring metering accuracy, stable operation, and long service life.

Description

Technical Field

[0001] This utility model relates to a water meter, and more particularly to a water meter drive shaft bushing. Background Technology

[0002] In a horizontal rotor water meter, the worm impeller is installed parallel to the inlet pipe section, and the drive shaft is installed vertically. A worm gear is mounted at the bottom of the drive shaft, and a magnet assembly is mounted at the top. The counter is installed outside the water meter, not in contact with the fluid. The first-stage gear of the counter is equipped with a magnet, which matches the magnet on the drive shaft. The water flow drives the impeller to rotate, and the impeller's rotation is transmitted to the drive shaft via the worm gear. The rotation of the drive shaft is then transmitted to the counter gear via the top magnet, thus achieving water measurement. A bushing encloses the drive shaft for protection.

[0003] The bushing has a cylindrical structure. The bottom of the bushing is near the rear of the impeller, where the pressure is higher, while the top is near the dead water zone, where the pressure is lower. Therefore, the flow inside the bushing is from bottom to top. During the use of the water meter, iron filings enter from the bottom of the bushing with the water flow and rise to the vicinity of the magnet. The magnet attracts the iron filings, affecting its magnetic field characteristics. When a large amount of iron filings accumulates, demagnetization and other malfunctions may occur, causing the counter to under-measure or even not measure at all, resulting in inaccurate measurement. Furthermore, the problem of iron filings attracting will reduce the service life of the water meter. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a water meter drive shaft bushing that is simple in structure, easy to process, and can effectively prevent iron filings from floating, thereby ensuring accurate counting and extending the service life of the water meter.

[0005] This utility model provides a water meter drive shaft bushing, including a meter housing 1. The meter housing 1 is provided with an impeller 2 and a transmission assembly. The impeller 2 is rotatably installed in the meter housing 1 facing the water inlet end. The transmission assembly is located downstream of the impeller 2. The transmission assembly includes a bushing body 4 and a drive shaft 3 disposed in the bushing body 4 for connecting the output shaft of the impeller 2 and the counter. The side wall of the bushing body 4 is provided with a water inlet hole 40a and a drain hole 40b. The water inlet hole 40a faces the impeller 2 and can guide water into the interior of the bushing body 4. The drain hole 40b faces away from the impeller 2 and can discharge the introduced water flow.

[0006] Furthermore, the lower end of the transmission shaft 3 is connected to the worm on the output shaft of the impeller 2 via a worm gear, and the upper end of the transmission shaft 3 is provided with a magnet for coupling connection with the counter.

[0007] Furthermore, the water inlet 40a is located directly behind the blades of the impeller 2.

[0008] Furthermore, the drain hole 40b is located above the water inlet hole 40a.

[0009] Furthermore, the top surface of the drain hole 40b is higher than the top surface of the water inlet hole 40a.

[0010] Furthermore, the water inlet 40a, the drain hole 40b, and the axis of the impeller 2 are located in the same plane.

[0011] Furthermore, the drainage hole 40b is a vertically arranged strip-shaped hole.

[0012] Furthermore, the drainage hole 40b is an elliptical hole or an oblong hole.

[0013] Furthermore, the drainage cross-sectional area of ​​the drainage hole 40b is larger than the water inlet cross-sectional area of ​​the water inlet hole 40a.

[0014] Furthermore, the bushing body 4 includes a first tube 41, a second tube 42 and a third tube 43 arranged sequentially from bottom to top with increasing diameters. The end of the third tube 43 extends outward at an angle to form a flared mouth 44. The water inlet hole 40a and the drain hole 40b are provided on the side wall of the first tube 41.

[0015] This utility model relates to a water meter drive shaft sleeve. An inlet and a outlet hole are provided on the side wall of the sleeve, forming a flow channel. The high-speed flow from the rear end of the impeller is introduced into the sleeve body and discharged through the outlet hole. This reduces the internal pressure of the sleeve, reduces or eliminates the upward velocity component of the water flow, and thus reduces or eliminates the upward flow of iron filings or other particles in the water, minimizing their impact on the magnet, ensuring measurement accuracy, and extending the water meter's service life. The inlet and outlet holes are designed with the inlet hole located directly behind the impeller, generating a large positive pressure to promote water flow into the sleeve body. Simultaneously, the outlet hole is located on the side opposite the impeller, facing the outlet end of the meter casing. Therefore, due to the influence of the sleeve body, a certain negative pressure is formed at the rear end of the outlet hole, promoting the outflow of internal water. This creates a stable flow channel between the inlet and outlet holes, effectively preventing iron filings or other particles in the water from continuing to flow upward. Other particles move upwards with the bushing body, effectively protecting the magnet. The drainage cross-sectional area of ​​the drain hole is larger than that of the inlet hole, ensuring that water enters from the inlet hole at the front end and flows smoothly out from the drain hole at the rear end, forming a stable and reliable flow path. This further optimizes the water flow dynamics and prevents iron filings and particles from entering the vicinity of the magnet at the upper end of the drive shaft, thus effectively protecting the magnet and ensuring metering accuracy. The drain hole is located above the inlet hole, preventing the upward velocity component from carrying iron filings or other particles above the drain hole and affecting the magnet. This reduces or eliminates the upward fluid drag on iron filings or other particles, promoting their settling and further improving the discharge effect. This utility model of a water meter drive shaft bushing has a compact structure, is easy to process and has low cost. It can effectively reduce or eliminate the rise of iron filings or other particles to the magnet position, effectively protecting the magnet, ensuring metering accuracy, stable use and long service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the water meter drive shaft sleeve of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the bushing body of the water meter drive shaft bushing of this utility model;

[0018] Figure 3 This is a schematic diagram of the bushing body of the water meter drive shaft bushing from another angle.

[0019] Figure 4 This is a schematic diagram of the water inlet hole of the water meter drive shaft sleeve of this utility model;

[0020] Figure 5 This is a schematic diagram of the drainage hole of the water meter drive shaft sleeve of this utility model;

[0021] Figure 6 This is a cross-sectional view of the bushing body of the water meter drive shaft bushing of this utility model.

[0022] Figure 7 This is another sectional view of the bushing body of the water meter drive shaft bushing of this utility model;

[0023] Figure 8 for Figure 7 Enlarged view of section A in the middle;

[0024] Figure 9 This is a cloud diagram of the vertical velocity component of the water meter drive shaft sleeve of this utility model;

[0025] Figure 10 This is a simulation diagram of the internal particle distribution of the water meter drive shaft sleeve of this utility model;

[0026] Figure 11 This is a simulation diagram of the internal particle distribution of a bushing without an open structure. Detailed Implementation

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] See Figures 1-8 This utility model provides a water meter drive shaft bushing, including a meter housing 1. An inlet and an outlet are respectively provided on both sides of the meter housing 1, and a counter is installed on its top. An impeller 2 and a transmission assembly are provided inside the meter housing 1. The impeller 2 faces the inlet end of the meter housing 1 and is rotatably installed inside the meter housing 1. The axis of the impeller 2 is parallel to the inlet end of the meter housing 1. The transmission assembly is located downstream of the impeller 2. In this embodiment, the inlet direction is considered upstream and the outlet direction is considered downstream. The transmission assembly is located downstream of the impeller 2, i.e., at the rear end of the impeller 2. The transmission assembly includes a bushing body 4 and a drive shaft 3. The drive shaft 3 is located inside the bushing body 4, and the two are coaxially arranged. Specifically, the axes of the drive shaft 3 and the bushing body 4 are perpendicular and intersect the axis of the impeller 2. In this embodiment, the axis of the impeller 2 is horizontal, so the transmission assembly is vertically arranged, and the counter is located at the upper end of the transmission assembly.

[0029] The bushing body 4 mainly serves to protect the transmission shaft 3, ensuring its stable and reliable operation.

[0030] The drive shaft 3 is used to connect the output shaft of the impeller 2 to the counter, thereby transmitting the rotation of the impeller 2 to the counter for measurement. Specifically, the lower end of the drive shaft 3 is connected to the output shaft of the impeller 2 via a worm gear. In this embodiment, a worm gear is provided at the lower end of the drive shaft 3, and a worm is provided on the output shaft of the impeller 2. The worm gear and the worm mesh to achieve the connection between the drive shaft 3 and the output shaft of the impeller 2. A magnet is provided at the upper end of the drive shaft 3, which is used for coupling connection with the counter. Specifically, it is used for coupling (magnetic) connection with the magnet on the first stage gear of the counter to transmit kinetic energy and achieve measurement.

[0031] A water inlet hole 40a and a drain hole 40b are provided on the side wall of the bushing body 4. The water inlet hole 40a faces the impeller 2, thereby guiding water into the interior of the bushing body 4, while the drain hole 40b faces away from the impeller 2 (the side away from the impeller 2), thereby discharging the introduced water flow. Through the above structure, the high-speed flow at the rear end (water outlet end) of the impeller 2 is introduced into the interior of the bushing body and discharged through the drain hole 40b. This can reduce the pressure inside the bushing, eliminate or reduce the upward velocity component of the water flow, thereby reducing or eliminating the upward flow of iron filings or other particles in the water flow, reducing the impact on the magnet, ensuring the accuracy of measurement, and extending the service life of the water meter.

[0032] In this application, the water inlet hole 40a, the drain hole 40b and the axis of the impeller 2 are located in the same plane, which has an optimal flow path.

[0033] To achieve a better elimination effect, in this application, the water inlet 40a is located directly behind the blades of the impeller 2. The water flow drives the impeller 2 to rotate, specifically, it drives the blades of the impeller 2. The water inlet 40a is located directly behind the blades, which can generate a large positive pressure, promoting the water flow into the bushing body 4. At the same time, since the drain hole 40b is located on the side away from the impeller 2, that is, facing the water outlet end of the casing, a certain negative pressure can be formed at the rear end of the drain hole 40b under the influence of the bushing body 4, promoting the internal water flow out. This can form a stable flow channel between the water inlet 40a and the drain hole 40b, which can effectively prevent iron filings or other particles in the water flow from moving upward with the bushing body 4, thus achieving effective protection of the magnet.

[0034] Since the inlet flow entering from the inlet hole 40a has an upward velocity component, in order to ensure the full discharge of the inlet flow, in this application, the drain hole 40b is located above the inlet hole 40a. This can prevent the upward velocity component from carrying iron filings or other particles to the top of the drain hole and affecting the magnet, that is, reduce or eliminate the upward fluid drag on iron filings or other particles, promote their settling, and further improve the discharge effect.

[0035] The specific configuration of the drain hole 40b can be such that the top surface of the drain hole 40b is higher than the top surface of the water inlet hole 40a, and the bottom surface of the drain hole 40b can be higher than the bottom surface of the water inlet hole 40a, or flush with the bottom surface of the water inlet hole 40b, or lower than the bottom surface of the water inlet hole 40b. The specific configuration is determined according to different usage environments.

[0036] To prevent internal pressure from forming inside the bushing body 4 and affecting the smooth flow of water, in this embodiment, the drainage cross-sectional area of ​​the drain hole 40b is larger than the inlet cross-sectional area of ​​the inlet hole 40a. This ensures that water enters from the inlet hole 40a at the front end and is smoothly discharged from the drain hole 40b at the rear end, forming a stable and reliable flow path. This further optimizes the water flow dynamics and prevents iron filings and particles from entering the vicinity of the magnet at the upper end of the drive shaft, thereby effectively protecting the magnet and ensuring metering accuracy.

[0037] The drain hole 40b in this application is a vertically arranged strip-shaped hole. Specifically, the drain hole 40b is an elliptical hole or an oblong hole, which can increase the height difference and prevent the upward velocity component from bringing iron filings or other particles to the vicinity of the magnet. At the same time, it can increase the cross-sectional area of ​​the drain hole 40b to ensure smooth water discharge. Furthermore, it can effectively control the width of the drain hole, so that a negative pressure is formed at its rear end, promoting water discharge and improving the interception effect of iron filings and other particles, thereby achieving effective protection of the magnet and ensuring measurement accuracy, operational stability and service life.

[0038] The structure of the bushing body in this application is described in reference. Figures 2-8 The bushing body 4 is cylindrical in shape and hollow inside, forming an installation space for mounting the drive shaft 3. It includes a first tube 41, a second tube 42 and a third tube 43 arranged sequentially from bottom to top. The first tube 41, the second tube 42 and the third tube 43 are coaxially arranged and their diameters increase sequentially. The upper end of the third tube 43 extends outward at an angle (flare) to form a flared mouth 44 that is larger at the top and smaller at the bottom. The water inlet hole 40a and the drain hole 40b are located on the side wall of the first tube 41. The water inlet hole 40a faces the impeller 2, that is, the water inlet end of the watch case 1, and the drain hole 40b faces away from the impeller 2, that is, the water outlet end of the watch case 1. A stable flow channel is formed in the first tube 41 to ensure the full discharge of iron filings and other particles.

[0039] A simulation analysis was conducted on the water meter using this structure;

[0040] See Figure 9 and Figure 10 ,in, Figure 9 This is a contour map of the vertical velocity components. Figure 10 The simulation results show the particle distribution inside the water meter. Figure 9 and Figure 10As can be seen, the internal flow of the bushing body 4 can be divided into three regions. The flow entering from the bottom of the bushing body is cut off by the introduced high-speed flow, and the particles entering from the bottom cannot continue to rise. The flow on the impeller side is slow, with almost no upward velocity; the fluid on the outlet side is affected by the introduced flow, and has a certain upward velocity near the hole. Some of the particles entering from the opening on the impeller side are discharged from the drain hole on the outlet side; the other part rises with the flow on the outlet side, and after rising to a certain height, the particles will begin to decelerate due to the loss of fluid drag and eventually settle.

[0041] The size and position of the drain hole 40b in this application will affect the upward flow inside the bushing. The particle rising situation can be evaluated by unidirectional solid-liquid coupling simulation. If the particles do not settle in time, the drain hole 40b can be enlarged and the opening position can be adjusted according to the specific application scenario.

[0042] See Figure 11 The bushing is without openings. As can be seen from the figure, the flow inside the bushing body is from bottom to top. During the use of the water meter, iron filings enter from the bottom of the bushing with the flow and reach the vicinity of the magnet, affecting the stable operation of the magnet.

[0043] from Figure 11 and Figure 10 The comparison shows that by setting water inlet and drain holes on the side wall of the bushing body 4, iron filings can be effectively prevented from entering the vicinity of the magnet with the flow inside the bushing body, thus effectively protecting the magnet.

[0044] This utility model relates to a water meter drive shaft sleeve. An inlet and a outlet hole are provided on the side wall of the sleeve, forming a flow channel. The high-speed flow from the rear end of the impeller is introduced into the sleeve body and discharged through the outlet hole. This reduces the internal pressure of the sleeve, reduces or eliminates the upward velocity component of the water flow, and thus reduces or eliminates the upward flow of iron filings or other particles in the water, minimizing their impact on the magnet, ensuring measurement accuracy, and extending the water meter's service life. The inlet and outlet holes are designed with the inlet hole located directly behind the impeller, generating a large positive pressure to promote water flow into the sleeve body. Simultaneously, the outlet hole is located on the side opposite the impeller, facing the outlet end of the meter casing. Therefore, due to the influence of the sleeve body, a certain negative pressure is formed at the rear end of the outlet hole, promoting the outflow of internal water. This creates a stable flow channel between the inlet and outlet holes, effectively preventing iron filings or other particles in the water from continuing to flow upward. Other particles move upwards with the bushing body, effectively protecting the magnet. The drainage cross-sectional area of ​​the drain hole is larger than that of the inlet hole, ensuring that water enters from the inlet hole at the front end and flows smoothly out from the drain hole at the rear end, forming a stable and reliable flow path. This further optimizes the water flow dynamics and prevents iron filings and particles from entering the vicinity of the magnet at the upper end of the drive shaft, thus effectively protecting the magnet and ensuring metering accuracy. The drain hole is located above the inlet hole, preventing the upward velocity component from carrying iron filings or other particles above the drain hole and affecting the magnet. This reduces or eliminates the upward fluid drag on iron filings or other particles, promoting their settling and further improving the discharge effect. This utility model of a water meter drive shaft bushing has a compact structure, is easy to process and has low cost. It can effectively reduce or eliminate the rise of iron filings or other particles to the magnet position, effectively protecting the magnet, ensuring metering accuracy, stable use and long service life.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A water meter drive shaft bushing characterized by: The device includes a watch case, within which an impeller and a transmission assembly are disposed. The impeller is rotatably mounted inside the watch case, facing the water inlet end. The transmission assembly is located downstream of the impeller. The transmission assembly includes a bushing body and a transmission shaft disposed within the bushing body for connecting the output shaft of the impeller to the counter. The side wall of the bushing body has a water inlet hole and a water outlet hole. The water inlet hole faces the impeller and can guide water into the interior of the bushing body, while the water outlet hole faces away from the impeller and can discharge the introduced water flow.

2. The water meter drive shaft sleeve as described in claim 1, characterized in that: The lower end of the drive shaft is connected to the worm on the output shaft of the impeller via a worm gear, and the upper end of the drive shaft is provided with a magnet for coupling with the counter.

3. The water meter drive shaft sleeve as described in claim 1, characterized in that: The water inlet is located directly behind the blades of the impeller.

4. The water meter drive shaft sleeve as described in claim 1, characterized in that: The drain hole is located above the inlet hole.

5. The water meter drive shaft sleeve as described in claim 1, characterized in that: The top surface of the drain hole is higher than the top surface of the inlet hole.

6. The water meter drive shaft sleeve as described in claim 1, characterized in that: The water inlet, the water outlet, and the axis of the impeller are located in the same plane.

7. The water meter drive shaft sleeve as described in claim 1, characterized in that: The drainage hole is a vertically arranged strip-shaped hole.

8. The water meter drive shaft sleeve as described in claim 7, characterized in that: The drainage hole is an oval or oblong hole.

9. The water meter drive shaft sleeve as described in claim 1, characterized in that: The drainage cross-sectional area of ​​the drainage hole is larger than the water inlet cross-sectional area of ​​the water inlet hole.

10. The water meter drive shaft sleeve as described in claim 1, characterized in that: The bushing body includes a first tube, a second tube, and a third tube arranged sequentially from bottom to top with increasing diameters. The end of the third tube extends outward at an angle to form a flared opening. The water inlet and the drain outlet are located on the side wall of the first tube.

Images