A single-flow meter inlet flow rate regulation structure

Abstract

This invention provides a water inlet flow rate adjustment structure for a single-flow meter, belonging to the field of water meter technology. The invention features an arc-shaped limiting strip, the center of which coincides with the axis of the impeller's rotation, positioned at the bottom of the metering chamber. A protruding limiting block is located on one side of the limiting strip. Simultaneously, a damping plate with an annular limiting groove is mounted on the damping plate, which has several damping ribs. The damping plate also has an annular limiting groove that mates with the limiting strip and several positioning notches that selectively mate with the limiting block. The water inlet flow rate is adjusted by regulating the damping ribs on the damping plate. The stability of the damping plate's installation position within the metering chamber is maintained through the cooperation of the limiting strip and the limiting groove, as well as the cooperation between the limiting block and one of the positioning notches. Furthermore, the water inlet flow rate can be adjusted by regulating the damping plate when the water meter's performance is unsatisfactory, eliminating the need for complete scrapping and rework, thus improving the water meter's pass rate and reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of water meter technology, specifically to a single-flow meter inlet flow rate adjustment structure. Background Technology

[0002] A single-flow meter is a velocity-type water meter that uses a single stream of water to drive an impeller to rotate as water passes through the meter, thus completing water metering. It is typically used in small-diameter pipeline systems and is favored by consumers for its small size, simple structure, and low manufacturing and maintenance costs.

[0003] Currently, existing single-flow water meters on the market, such as the single-flow dry water meter disclosed in patent CN205027391U, have an impeller housing with an inlet and an outlet on its side wall. The impeller includes an impeller shaft and blades evenly distributed on the outer circumferential wall of the impeller shaft. A cover plate is provided on the impeller housing, and a fixing hole corresponding to the cover plate is provided inside the impeller housing. A lower center is provided in the fixing hole, and an upper connecting hole is provided on the cover plate. The two ends of the impeller shaft are rotatably connected to the lower center and the upper connecting hole, respectively. This allows the impeller to rotate by impacting the blades when water flows into the impeller housing through the inlet. Simultaneously, a magnet is provided on the impeller, and a magnetically coupled mechanism is installed on the impeller housing. When the impeller rotates, the magnet drives the mechanism to rotate, thus counting the water flow. Although the above-mentioned single-flow meter can measure water consumption, the inner wall of the impeller housing where the impeller is installed is smooth. When the water flows in from the inlet and out from the outlet, it directly impacts the blades. Since the inlet and outlet are formed and fixed during the impeller manufacturing process, the direction of water inflow and the direction of the impeller blades are restricted. If problems such as unsatisfactory performance occur during the production process, it cannot be directly adjusted and the entire meter needs to be scrapped and reprocessed, which affects the metering accuracy. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this invention aims to provide a water inlet flow rate adjustment structure for a single-flow meter. A rotatable and adjustable damping plate is installed at the bottom of the metering chamber within the meter housing. The damping plate has several damping ribs arranged at different angles. When water flows into the metering chamber from the inlet, it is blocked and guided at the damping ribs. Furthermore, the angle of the damping ribs relative to the inlet can be adjusted by rotating the damping plate to meet damping adjustment requirements, thereby regulating the water inlet flow rate. When performance is unsatisfactory, adjustments can be made simply by adjusting the damping plate, eliminating the need for complete scrapping and rework. This improves the water meter's pass rate and reduces production costs.

[0005] The specific technical solution is as follows:

[0006] A flow rate regulating structure for a single-flow meter includes a casing and an impeller. The casing has a metering cavity, and an inlet and an outlet, both communicating with the metering cavity, are respectively provided on both sides of the casing. The metering cavity has an upper opening. The impeller is installed inside the metering cavity. A support base is provided inside the metering cavity and at the bottom of the cavity. The support base has an embedded hole, and a rotating shaft seat is installed in the embedded hole. The lower end of the impeller's rotating shaft is inserted into the rotating shaft seat and rotatably connected. The structure also includes a damping plate and an arc-shaped limiting device provided inside the metering cavity and at the bottom of the cavity. The limiting strip has its center coincident with the axis of the impeller's rotation. A limiting block protrudes from one side of the limiting strip, and a ring-shaped limiting groove is formed on the damping plate. At the same time, several positioning notches are formed on one side wall of the limiting groove. The damping plate is provided with several damping ribs that protrude towards the impeller in a ring array with the axis of the impeller's rotation as the center. When the damping plate is installed in the metering chamber, the limiting strip is embedded in the limiting groove, and the limiting block is selectively embedded in a positioning notch.

[0007] In the above-mentioned single flow meter inlet flow rate adjustment structure, the support seat on the bottom of the metering chamber is a cylindrical structure, the inner cavity of the support seat forms an embedded hole, and the damping plate has a sleeve hole in the center, which is fitted outside the support seat.

[0008] The above-mentioned inlet flow rate regulating structure of a single flow meter includes a damping plate comprising an inner plate and an outer ring. The inner plate is a circular plate, and the outer ring is fitted outside the inner plate. A gap is provided between the inner side of the outer ring and the outer side of the inner plate. Several damping ribs are provided between the inner plate and the outer ring, and both ends of each damping rib are connected to the inner plate and the outer ring, respectively.

[0009] In the above-mentioned single flow meter inlet flow rate adjustment structure, a sleeve is provided on the damping plate and located outside the sleeve hole. The sleeve is hollow and communicates with the sleeve hole with the same inner diameter.

[0010] The above-mentioned single flow meter inlet flow rate adjustment structure includes an annular groove on the inner wall of the sleeve, a clamping component on the support base, and the clamping component having a clamping head that selectively engages with the annular groove.

[0011] In the above-mentioned single flow meter inlet flow rate adjustment structure, the clamping assembly further includes a retraction spring. The side wall of the support base is provided with a telescopic hole that connects to the embedded hole. The clamping head is slidably disposed in the telescopic hole and one end extends into the embedded hole. One end of the retraction spring is connected to the end of the clamping head that extends into the embedded hole. The end of the clamping head that extends into the embedded hole is provided with a pushing slope, and the rotating shaft seat is installed in the embedded hole to press against the pushing slope.

[0012] The above-mentioned single flow meter inlet flow rate adjustment structure includes two clamps symmetrically arranged on the support base, with the two ends of the retraction spring connected to one end of each clamp extending into the recess.

[0013] In the above-mentioned single-flow meter inlet flow rate adjustment structure, the bottom wall of the annular groove is provided with a pressing slope. The pressing slope is arranged axially along the impeller shaft, and the height of the side of the pressing slope away from the support is higher than the height of the side closer to the support.

[0014] In the above-mentioned single flow meter inlet flow rate adjustment structure, each clamp head has a hanging hole on one end extending into the recess, and the two ends of the retraction spring are respectively provided with hooks and are respectively connected to the hanging holes on the two clamp heads.

[0015] The positive effects of the above technical solution are:

[0016] The aforementioned single-flow meter's inlet flow rate adjustment structure features several arc-shaped limiting strips on the bottom of the metering chamber of the meter housing, with the center of each limiting strip coinciding with the axis of the impeller's rotation. A damping plate with an annular limiting groove is also included. A protruding limiting block is located on one side of the limiting strip, and several positioning notches are provided on one side wall of the limiting groove, with the limiting block selectively engaging into a positioning notch. Furthermore, several damping ribs are arranged in a circular array around the axis of the impeller's rotation on the damping plate. These damping ribs are adjusted by rotating the damping plate. The damping plate changes the angle of the damping ribs relative to the inlet, adjusting the inlet water damping and thus regulating the inlet water flow rate. Furthermore, the combination of a limiting strip and a limiting groove meets the requirements for damping plate rotation adjustment. Simultaneously, the combination of a limiting block and one of the positioning notches restricts the circumferential rotation of the damping plate after installation, ensuring the relative stability of the damping ribs on the damping plate during use. This allows the inlet water flow rate to be adjusted by regulating the damping plate when the water meter exhibits poor performance, eliminating the need for complete scrapping and rework, thus improving the water meter's pass rate and reducing production costs. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of a single-flow meter inlet flow rate regulating structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of an embodiment of a single-flow meter inlet flow rate regulating structure according to the present invention.

[0019] Figure 3 This is a structural diagram of the damping plate of a single flow meter inlet flow rate adjustment structure according to this utility model;

[0020] Figure 4 This is a structural diagram of the casing of a single-flow meter according to the present invention for regulating the inlet flow rate;

[0021] Figure 5 for Figure 2 Enlarged view of section A;

[0022] Figure 6 This is a structural diagram of the clamp head of a single flow meter's inlet flow rate adjustment structure according to this utility model.

[0023] In the attached diagram: 1. Casing; 11. Metering chamber; 12. Inlet; 13. Outlet; 14. Support base; 15. Shaft base; 16. Limiting strip; 141. Embedded hole; 142. Telescopic hole; 161. Limiting block; 2. Impeller; 3. Damping plate; 31. Limiting groove; 32. Damping rib; 33. Sleeve hole; 34. Inner plate; 35. Outer ring; 36. Sleeve; 311. Positioning notch; 361. Annular groove; 3611. Pressing inclined surface; 4. Clamping assembly; 41. Clamp head; 42. Retraction spring; 411. Pushing inclined surface; 412. Hanging hole. Detailed Implementation

[0024] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 6 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0025] Figure 1 This is a structural diagram of an embodiment of a single-flow meter inlet flow rate regulating structure of the present invention; Figure 2 This is a cross-sectional view of an embodiment of a single-flow meter inlet flow rate regulating structure according to this utility model. Figure 1 and Figure 2 As shown, the inlet flow rate adjustment structure of the single flow meter provided in this embodiment includes: meter housing 1, impeller 2 and damping plate 3.

[0026] Figure 3 This is a structural diagram of the damping plate of a single flow meter inlet flow rate adjustment structure according to this utility model; Figure 4 This is a structural diagram of the casing of a single-flow meter according to the present invention, which provides an inlet flow rate adjustment structure. Figures 1 to 4As shown, the meter housing 1 has a metering chamber 11. Inlet 12 and outlet 13, both communicating with the metering chamber 11, are respectively provided on both sides of the meter housing 1, allowing water to enter the metering chamber 11 from the inlet 12 and exit from the outlet 13 after impacting the impeller 2. The metering chamber 11 has an upper opening, through which the impeller 2 is installed. A counter and other structures are also provided on the upper opening, allowing the impeller 2 to rotate under the impact of water flow, thus counting the rotation of the impeller 2 and achieving water usage metering. Since most water meters on the market have counters, and they are usually used in conjunction with the impeller 2, the structure of the counter itself and the principle of its use with the impeller 2 are existing technologies and will not be described further here. Meanwhile, a support base 14 is provided inside the metering chamber 11 and located at the bottom of the chamber. The support base 14 has an embedded hole 141, and a rotating shaft seat 15 is installed in the embedded hole 141. The lower end of the rotating shaft of the impeller 2 is inserted into the rotating shaft seat 15 and rotated. That is, the cooperation between the support base 14 and the rotating shaft seat 15 provides a foundation for the installation of the impeller 2 in the metering chamber 11, and also ensures that the impeller 2 can rotate in the metering chamber 11.

[0027] Specifically, an arc-shaped limiting strip 16 is provided inside the metering chamber 11 and located at the bottom of the chamber. The center of the limiting strip 16 coincides with the axis of rotation of the impeller 2, ensuring that the damping plate 3 is positioned within the metering chamber 11 and that the damping plate 3's effect on the water flow is reflected in the impeller 2, thus meeting the metering and adjustment requirements. Furthermore, a limiting block 161 protrudes from one side of the limiting strip 16, and an annular limiting groove 31 is formed on the damping plate 3. This allows the damping plate 3 to be positioned within the metering chamber 11 by engaging with the limiting block 161 through the limiting groove 31. Simultaneously, several positioning notches 311 are formed on one side of the groove 31. These notches restrict the circumferential rotation of the damping plate 3, ensuring that the angle of the damping plate 3 relative to the inlet 12 remains stable, thus meeting the structural stability requirements during water meter operation. Furthermore, the damping plate 3 is provided with a number of damping ribs 32 arranged in a circular array with the axis of rotation of the impeller 2 as the center, protruding towards the impeller 2. This ensures that the arrangement direction of each damping rib 32 on the damping plate 3 relative to the axis of rotation of the impeller 2 is different, so that the arrangement direction of the damping plate 3 relative to the inlet 12 is different. This allows the damping to be adjusted by changing the arrangement direction of the damping ribs 32 relative to the inlet 12 when the damping plate 3 is rotated, thereby changing the flow velocity of the inlet 12. Furthermore, when the damping plate 3 is installed in the metering chamber 11, the limiting strip 16 is embedded in the limiting groove 31. At the same time, the limiting block 161 is selectively embedded in a positioning notch 311. The cooperation between the limiting strip 16 and the limiting groove 31 can regulate the direction of the damping plate 3 when rotating in the metering chamber 11, ensuring that the center of the damping plate 3 after installation coincides with the axis of rotation of the impeller 2. This ensures that the distance between the damping rib 32 and the impeller 2 remains unchanged when the damping plate 3 is rotated and adjusted. This means that when the damping plate 3 is rotated and adjusted, only the arrangement angle of the damping rib 32 is changed, the damping effect is adjusted, and the water inlet flow rate is adjusted, without causing other effects. This ensures that when the water meter has unsatisfactory performance, it can be adjusted by adjusting the damping plate 3, without the need for complete scrapping and rework, thus improving the pass rate of the water meter and reducing production costs. In addition, the cooperation between the limiting block 161 and one of the positioning notches 311 can prevent the circumferential rotation of the damping plate 3 during use, thereby improving the stability of the structure after installation. Furthermore, by selecting different positioning notches 311 to cooperate with the limiting block 161, the damping plate 3 can be rotated at a predetermined angle to meet the predetermined adjustment requirements. The adjustment is more convenient and does not require operators to make multiple adjustments based on experience to meet the usage requirements, thus improving its feasibility.

[0028] More specifically, the support seat 14 located at the bottom of the metering chamber 11 has a cylindrical structure. In this case, the inner cavity of the support seat 14 forms an embedded hole 141. Preferably, the support seat 14 and the casing 1 are integrally injection molded, resulting in higher overall structural strength, no assembly gaps, and higher accuracy. Furthermore, a sleeve hole 33 is provided at the center of the damping plate 3. The sleeve hole 33 is fitted onto the support seat 14. Through the mutual fitting of the sleeve hole 33 and the support seat 14, the damping plate 3 can be quickly paired when installed on the bottom of the metering chamber 11, facilitating the rapid installation of the damping plate 3. Simultaneously, the support seat 14 can be used as a shaft for the damping plate 3 during subsequent adjustment of its rotation, facilitating the adjustment of the damping plate 3.

[0029] More specifically, the damping plate 3 includes an inner plate 34 and an outer ring 35. The inner plate 34 is circular, and the outer ring 35 is fitted over it. A gap exists between the inner side of the outer ring 35 and the outer side of the inner plate 34, forming a limiting groove 31. During installation, the limiting strip 16 on the bottom of the metering cavity 11 is embedded in the gap between the inner plate 34 and the outer ring 35, thus positioning the damping plate 3. Furthermore, since the limiting groove 31 is a complete circular structure, it can accommodate the 360° rotation adjustment requirement of the damping plate 3, offering better adaptability. Additionally, several damping ribs 32 are positioned between the inner plate 34 and the outer ring 35, with each damping rib 32 connected at both ends to the inner plate 34 and the outer ring 35 respectively. This allows the inner plate 34, outer ring 35, and damping ribs 32 to form an integral structure, resulting in better overall integrity, structural stability, and easier adjustment. It is worth noting that the sleeve hole 33 is located at the center of the inner plate 34, ensuring that the sleeve hole 33 is located at the exact center of the damping plate 3.

[0030] More specifically, a sleeve 36 is also provided on the damping plate 3 and outside the sleeve hole 33. The sleeve 36 is hollow and communicates with the sleeve hole 33 with the same inner diameter. The sleeve 36 expands the depth of the sleeve hole 33, making the damping plate 3 more stable when it is sleeved on the support base 14. Preferably, the sleeve 36 and the damping plate 3 are an integral structure, which has higher overall structural strength and is more stable and reliable.

[0031] Figure 5 for Figure 2 Enlarged view of section A; Figure 6 This is a structural diagram of the clamp head of a single-flow meter's inlet flow rate adjustment structure according to this utility model. (See diagram for reference.) Figures 2 to 6As shown, an annular groove 361 is formed on the inner wall of the sleeve 36, allowing the damping plate 3 to adapt to any rotation angle when it rotates, thus providing conditions for subsequent engagement and clamping with the support base 14. Simultaneously, a clamping assembly 4 is provided on the support base 14, and the clamping assembly 4 has a clamping head 41. The clamping head 41 selectively engages with the annular groove 361. That is, when the damping plate 3 is sleeved on the support base 14, the clamping head 41 of the clamping assembly 4 can engage with the annular groove 361, thereby restricting the axial movement of the damping plate 3. Combined with the circumferential limiting effect achieved by the limiting block 161 and the positioning notch 311, this ensures that the damping plate 3 can be stably installed on the bottom of the metering chamber 11, preventing loosening during use and affecting performance. In addition, when the clamp 41 is dislodged from the annular groove 361, the damping plate 3 can move axially along the support base 14, thereby meeting the usage requirements of adjusting the damping plate 3.

[0032] More specifically, the clamping assembly 4 includes not only the clamping head 41 mentioned above, but also a retraction spring 42. In this case, a telescopic hole 142 communicating with the recessed hole 141 is provided on the side wall of the support base 14. The clamping head 41 is slidably disposed within the telescopic hole 142, with one end extending into the recessed hole 141. The telescopic hole 142 provides installation and movement space for the clamping head 41, and also allows one end of the clamping head 41 to remain within the recessed hole 141, providing conditions for subsequent engagement between the clamping head 41 and the retraction spring 42. One end of the retraction spring 42 is connected to the end of the clamping head 41 extending into the recessed hole 141, allowing the clamping head 41 to retract into the recessed hole 141 under the action of the retraction spring 42, thereby allowing the other end of the clamping head 41 to disengage from the annular groove 361. This satisfies the movement requirements of the damping plate 3 when it is fitted onto the support base 14, facilitating the adjustment of the damping plate 3. Furthermore, a pushing slope 411 is provided at one end of the clamping head 41 extending into the recess 141. When the rotating shaft seat 15 is installed in the recess 141, it presses against the pushing slope 411. This allows the clamping head 41 to be pushed outwards towards the support seat 14 by the rotating shaft seat 15 when the impeller 2 is installed on the support seat 14 after the damping plate 3 is installed on the support seat 14. This allows one end of the clamping head 41 to extend out of the telescopic hole 142 and be inserted into the annular groove 361, thereby achieving axial positioning of the damping plate 3. When adjustment is required, it is only necessary to disassemble the impeller 2 and remove the rotating shaft seat 15 from the support seat 14. The clamping head 41 will automatically retract under the action of the return spring 42 and disengage from the annular groove 361, thus meeting the adjustment requirements. Furthermore, the support base 14 and shaft seat 15 for installing the impeller 2 are fully utilized to improve the stability and reliability of the damping plate 3 during installation, prevent axial movement of the damping plate 3 during use, and ensure the stability and accuracy of water meter measurement.

[0033] More specifically, the clamping assembly 4 includes two clamping heads 41, which are symmetrically arranged on the support base 14. The two ends of the retraction spring 42 are respectively connected to one end of the two clamping heads 41 that extends into the recess 141, so that the retraction spring 42 can act on the two clamping heads 41 at the same time, causing the two clamping heads 41 to retract at the same time. The structure is simpler and easier to disassemble and assemble.

[0034] More specifically, a pressing inclined surface 3611 is provided on the bottom wall of the annular groove 361. At this time, the pressing inclined surface 3611 is arranged axially along the shaft of the impeller 2. Furthermore, the height of the side of the pressing inclined surface 3611 away from the support base 14 is higher than the height of the side closer to the support base 14. This allows the end of the clamping head 41 to push and press the pressing inclined surface 3611 when the clamping head 41 is inserted into the annular groove 361. Under the action of the pressing inclined surface 3611, the damping plate 3 is subjected to a force towards the bottom of the metering cavity 11, thereby more stably installing the damping plate 3 at the bottom of the metering cavity 11. This more effectively prevents the damping plate 3 from axially moving due to assembly gaps, resulting in better stability after installation.

[0035] More specifically, each clip 41 has a hanging hole 412 on one end extending into the recess 141. At the same time, hooks are provided at both ends of the retraction spring 42. The hooks at both ends of the retraction spring 42 are respectively connected to the hanging holes 412 on the two clips 41. The design of the hanging holes 412 and the hooks makes it convenient to insert the ends of the two clips 41 with the hanging holes 412 from the outside of the support base 14 into the corresponding telescopic holes 142 when the clips 41 are installed on the support base 14, so that the ends of the clips 41 with the hanging holes 412 extend into the recess 141. At this time, it is only necessary to use tweezers to hold the retraction spring 42 and put it into the recess 141, and hook the hooks at both ends of the retraction spring 42 into the hanging holes 412 on the two clips 41 respectively. The assembly is convenient and conducive to manufacturing.

[0036] The inlet flow rate regulating structure of the single flow meter provided in this embodiment includes a meter housing 1, an impeller 2, and a damping plate 3. An arc-shaped limiting strip 16, whose center coincides with the axis of rotation of the impeller 2, is provided on the bottom of the metering chamber 11 of the meter housing 1. A protruding limiting block 161 is provided on one side of the limiting strip 16. Simultaneously, a damping plate 3 with an annular limiting groove 31 is provided, and several damping ribs 32 are provided on the damping plate 3. Furthermore, the damping plate 3 has an annular limiting groove 31 that cooperates with the limiting strip 16 and a limiting... The selectively matched positioning notches 311 of block 161 adjust the water inlet damping through the damping ribs 32 on the damping plate 3, thereby adjusting the water inlet flow rate. The damping plate 3 is kept stable in the metering cavity 11 by the cooperation of the limiting strip 16 and the limiting groove 31, as well as the cooperation of the limiting block 161 and one of the positioning notches 311. It can also adjust the water inlet flow rate by adjusting the damping plate 3 when the water meter has unsatisfactory performance, without the need for complete scrapping and rework, thus improving the water meter's pass rate and reducing production costs.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A single-flow water inflow speed regulating structure, comprising a watchcase and an impeller, the watchcase having a metering cavity, the watchcase having an inflow port and an outflow port respectively arranged on two sides of the watchcase and both in communication with the metering cavity, the metering cavity having an upper opening, the impeller being installed in the metering cavity, a support seat being arranged in the metering cavity and on the bottom of the cavity, the support seat having an embedded hole, a rotating shaft seat being installed in the embedded hole, the lower end of a rotating shaft of the impeller being inserted into the rotating shaft seat and being rotationally connected, characterized in that, Also includes: A damping plate is provided inside the metering cavity and at the bottom of the cavity, with an arc-shaped limiting strip whose center coincides with the axis of the impeller's rotation. A limiting block protrudes from one side of the limiting strip, and an annular limiting groove is formed on the damping plate. At the same time, several positioning notches are formed on one side wall of the limiting groove. Furthermore, the damping plate is provided with several damping ribs protruding towards the impeller in a circular array with the axis of the impeller's rotation as the center. When the damping plate is installed in the metering cavity, the limiting strip is embedded in the limiting groove, and the limiting block is selectively embedded in one of the positioning notches.

2. The inlet flow rate regulating structure of the single-flow meter according to claim 1, characterized in that, The support base on the bottom of the metering chamber is a cylindrical structure, and the inner cavity of the support base forms the embedded hole. A sleeve hole is opened in the center of the damping plate, and the sleeve hole is fitted outside the support base.

3. The inlet flow rate regulating structure of the single-flow meter according to claim 1, characterized in that, The damping plate includes an inner plate and an outer ring. The inner plate is a circular plate. The outer ring is sleeved on the outside of the inner plate. A gap is provided between the inner side of the outer ring and the outer side of the inner plate. A plurality of damping ribs are disposed between the inner plate and the outer ring. Both ends of each damping rib are connected to the inner plate and the outer ring, respectively.

4. The inlet flow rate regulating structure of the single-flow meter according to claim 2, characterized in that, A sleeve is provided on the damping plate and located outside the sleeve hole. The sleeve is hollow and communicates with the sleeve hole, and has the same inner diameter.

5. The inlet flow rate regulating structure of the single flow meter according to claim 4, characterized in that, An annular groove is formed on the inner wall of the sleeve, and a clamping component is provided on the support base. The clamping component has a clamping head, which selectively engages with the annular groove.

6. The inlet flow rate regulating structure of the single-flow meter according to claim 5, characterized in that, The clamping assembly also includes a retraction spring. The side wall of the support base is provided with a telescopic hole that communicates with the recessed hole. The clamping head is slidably disposed in the telescopic hole and one end extends into the recessed hole. One end of the retraction spring is connected to the end of the clamping head that extends into the recessed hole. The end of the clamping head that extends into the recessed hole is provided with a pushing slope, and the rotating shaft seat presses against the pushing slope when it is installed in the recessed hole.

7. The inlet flow rate regulating structure of the single-flow meter according to claim 5 or 6, characterized in that, The clamping head is provided in two symmetrically arranged on the support base, and the two ends of the retraction spring are respectively connected to one end of the two clamping heads that extends into the recess.

8. The inlet flow rate regulating structure of the single flow meter according to claim 5, characterized in that, The bottom wall of the annular groove is provided with a pressing slope. The pressing slope is arranged axially along the shaft of the impeller, and the height of the side of the pressing slope away from the support is higher than the height of the side closer to the support.

9. The inlet flow rate regulating structure of the single-flow meter according to claim 7, characterized in that, Each of the card heads has a hanging hole on one end extending into the recess, and the two ends of the retraction spring are respectively provided with hooks that are respectively connected to the hanging holes on the two card heads.

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