Flow error adjusting mechanism and helical vane type water meter

Abstract

The utility model provides a flow error adjusting mechanism and a spiral vane type water meter, and relates to the technical field of water meters, the flow error adjusting mechanism is suitable for the spiral vane type water meter, and the flow error adjusting mechanism comprises an adjusting assembly I installed on a rectifier; the adjusting assembly I comprises an adjusting sheet I and an adjusting piece I connected with the adjusting sheet I; the adjusting sheet I is movably connected to the rectifier; the adjusting piece I adjusts the adjusting piece I to swing and rotate, the inclination angle of water flow passing through the rectifier can be changed, then the water flow impact force borne by an impeller of the helical vane type water meter can be adjusted, the flow error adjusting range is widened, and a flow error curve can be smoother.

Description

Technical Field

[0001] The utility model relates to the technical field of water meters, in particular to a flow error regulating mechanism and a propeller-type water meter. Background Art

[0002] Propeller water meters usually use a gate-type error adjustment method, which adjusts the gate opening to change the flow cross-sectional area of ​​the diversion flow channel, and adjusts the water meter flow rate when the flow rate through the impeller is constant, thereby adjusting the water meter flow error. If the error adjustment accuracy is improved, a smaller gate size needs to be configured to achieve fine-tuning of the flow error, but this will limit the adjustment range of the flow error. Moreover, the gate-type error adjustment mechanism has a large difference in the adjustment effect under different flow rates. The error adjustment effect for larger flow rates is negligible, making it difficult to calibrate the water meter flow; the error adjustment accuracy for smaller flow rates is low and the error curve is not smooth enough, which increases the difficulty of water meter flow error verification. Utility Model Content

[0003] The utility model aims to provide a flow error adjustment mechanism and a propeller-type water meter, so as to alleviate the technical problems of the propeller-type water meter having a limited error adjustment range and an insufficiently smooth error curve.

[0004] In a first aspect, the flow error adjustment mechanism provided by the utility model is applicable to a propeller-type water meter, and the flow error adjustment mechanism comprises an adjustment component I installed on a rectifier;

[0005] The adjusting assembly I comprises: an adjusting piece I and an adjusting member I connected to the adjusting piece I;

[0006] The regulating piece I is movably connected to the rectifier;

[0007] The adjusting member I is used to adjust the swing of the adjusting piece I to change the inclination angle of the water flow passing through the rectifier.

[0008] In combination with the first aspect, the utility model provides a first possible implementation of the first aspect, wherein the adjustment member I comprises an adjustment ring rotatably connected to the rectifier;

[0009] The adjusting piece I is pivotally connected to the rectifier around an axis extending radially along the adjusting ring, and the adjusting ring is hinged to the adjusting piece I.

[0010] In combination with the first possible implementation of the first aspect, the utility model provides a second possible implementation of the first aspect, wherein a plurality of the adjustment plates I are provided, and the plurality of adjustment plates I are spaced apart along the circumferential direction of the adjustment ring.

[0011] In combination with the first possible implementation of the first aspect, the utility model provides a third possible implementation of the first aspect, wherein the adjustment member I further includes: a shaft member I, a swing arm and a transmission member;

[0012] One end of the swing arm is connected to the shaft member I, the transmission member is slidably hinged to the other end of the swing arm, and the transmission member is connected to the adjustment ring.

[0013] In combination with the third possible implementation of the first aspect, the utility model provides a fourth possible implementation of the first aspect, wherein the transmission member includes: a shaft pin, an arm and a swing shaft;

[0014] One end of the arm is connected to the shaft pin, and the other end of the arm is connected to the swing shaft. The shaft pin is parallel to the swing shaft, the shaft pin is slidably hinged to the swing arm, and the swing shaft is connected to the adjustment ring.

[0015] In combination with the first aspect, the utility model provides a fifth possible implementation manner of the first aspect, wherein the rectifier is mounted on a bracket, and the bracket is provided with a rectifier port, a branch port I and a branch port II;

[0016] The rectifier is installed at the rectifier port;

[0017] The flow error adjustment mechanism further includes: an adjustment component II and an adjustment component III;

[0018] The regulating component II is installed at the branch port I to adjust the flow cross-sectional area of ​​the branch port I;

[0019] The regulating component III is installed at the branch port II to adjust the flow cross-sectional area of ​​the branch port II.

[0020] In combination with the fifth possible implementation of the first aspect, the utility model provides a sixth possible implementation of the first aspect, wherein the adjustment component II includes: an adjustment sheet II and an adjustment member II;

[0021] The adjusting piece II is slidably connected to the bracket, and the adjusting piece II shields the branch opening I;

[0022] The adjusting member II is connected to the bracket or the adjusting piece II, and the adjusting member II is used to adjust and lock the adjusting piece II.

[0023] In combination with the fifth possible implementation of the first aspect, the utility model provides a seventh possible implementation of the first aspect, wherein the adjustment component III includes: an adjustment sheet III and an adjustment member III;

[0024] The adjusting piece III is swingably connected to the bracket, and the adjusting piece III shields the branch opening II;

[0025] The swing axis of the adjusting piece III is parallel to the adjusting piece III, or the swing axis of the adjusting piece III coincides with the adjusting piece III;

[0026] The adjusting member III is connected to the bracket and / or the adjusting piece III, and the adjusting member III is used to adjust and lock the adjusting piece III.

[0027] In a second aspect, the utility model provides a propeller-type water meter, comprising: a meter case, an impeller and a flow error adjustment mechanism as described in the first aspect;

[0028] The housing has an inlet and an outlet, the impeller is installed in the housing, and the impeller is driven to rotate by the water flowing from the inlet to the outlet;

[0029] The rectifier is installed between the inlet and the impeller, and the regulating piece I is opposite to the blades of the impeller.

[0030] In combination with the second aspect, the rectifier and the impeller are respectively mounted on the bracket; a flange is mounted on the housing, and the flange presses and fixes the bracket.

[0031] The embodiment of the utility model brings the following beneficial effects: an adjusting component I installed on the rectifier is adopted, the adjusting component I includes an adjusting sheet I and an adjusting part I connected to the adjusting sheet I, the adjusting sheet I is movably connected to the rectifier, and the swing of the adjusting sheet I is adjusted by the adjusting part I, so that the inclination angle of the water flow passing through the rectifier can be changed, and then the impact force of the water flow on the impeller of the propeller water meter can be adjusted, thereby expanding the range of flow error adjustment and making the flow error curve smoother.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 A schematic diagram of a flow error adjustment mechanism and a flange of a propeller-type water meter provided in an embodiment of the utility model;

[0035] Figure 2A schematic diagram of a flow error adjustment mechanism of a propeller-type water meter and a cross-sectional view of a flange provided in an embodiment of the utility model;

[0036] Figure 3 A schematic diagram of a rectifier and an adjustment component I of a flow error adjustment mechanism provided by an embodiment of the utility model;

[0037] Figure 4 A schematic diagram of an adjustment component I of a flow error adjustment mechanism provided in an embodiment of the utility model;

[0038] Figure 5 A schematic diagram of a flow error adjustment mechanism provided in an embodiment of the utility model;

[0039] Figure 6 A schematic diagram of a bracket of a flow error adjustment mechanism provided in an embodiment of the utility model;

[0040] Figure 7 An exploded view of the regulating component II of the flow error regulating mechanism provided in the embodiment of the utility model;

[0041] Figure 8 A schematic diagram of an adjustment component III of a flow error adjustment mechanism provided in an embodiment of the utility model;

[0042] Fig. 9 A cross-sectional view of a propeller-type water meter provided in an embodiment of the utility model.

[0043] Icons: 100 - adjustment component Ⅰ; 110 - adjustment plate Ⅰ; 120 - adjustment member Ⅰ; 121 - adjustment ring; 122 - shaft member Ⅰ; 123 - swing arm; 124 - transmission member; 1241 - shaft pin; 1242 - arm; 1243 - swing shaft; 125 - baffle; 200 - rectifier; 300 - bracket; 301 - rectifier port; 302 - branch port Ⅰ; 303 - branch port Ⅱ; 304 - slideway; 400 - adjustment assembly II; 410 - adjustment plate II; 411 - rack; 420 - adjustment member II; 421 - gear; 422 - shaft member II; 423 - first plug cap; 500 - adjustment assembly III; 510 - adjustment plate III; 520 - adjustment member III; 521 - shaft member III; 522 - second plug cap; 600 - case; 601 - inlet; 602 - outlet; 700 - impeller; 800 - flange. DETAILED DESCRIPTION

[0044] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used to describe the difference in names, and cannot be understood as indicating or implying relative importance. The physical quantities in the formula, if not separately marked, should be understood as basic quantities of the basic units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the flow error adjustment mechanism provided by the embodiment of the utility model is suitable for a propeller-type water meter, and the flow error adjustment mechanism includes an adjustment component Ⅰ100 installed on the rectifier 200; the adjustment component Ⅰ100 includes: an adjustment sheet Ⅰ110 and an adjustment member Ⅰ120 connected to the adjustment sheet Ⅰ110; the adjustment sheet Ⅰ110 is movably connected to the rectifier 200; the adjustment member Ⅰ120 is used to adjust the swing of the adjustment sheet Ⅰ110 to change the inclination angle of the water flow passing through the rectifier 200.

[0048] In an optional embodiment, the adjusting member Ⅰ120 can be configured as a connecting rod, and the connecting rod drives the adjusting piece Ⅰ110 to swing by pushing and pulling to change the water flow inclination angle; in addition, the connecting rod can be driven by a slider that is slidably matched with the bracket 300, and the slider can be manually operated, and its position is locked by the friction between the slider and the bracket 300. The adjusting member Ⅰ120 can also include a bolt and a spring, and the adjusting piece Ⅰ110 can be pushed to swing by tightening the bolt. The spring is installed between the adjusting piece Ⅰ110 and the bracket 300, and the spring can drive the adjusting piece Ⅰ110 to swing in the opposite direction. The swing angle of the adjusting piece Ⅰ110 can be changed by tightening or loosening the bolt.

[0049] In this embodiment, the adjusting member Ⅰ120 includes an adjusting ring 121 rotatably connected to the rectifier 200 ; the adjusting sheet Ⅰ110 is pivotally connected to the rectifier 200 around an axis extending radially along the adjusting ring 121 , and the adjusting ring 121 is hinged to the adjusting sheet Ⅰ110 .

[0050] Specifically, the adjusting ring 121, the rectifier 200 and the impeller 700 are coaxially arranged, the adjusting piece I110 deviates from the axial position of the adjusting ring 121, and the swing axis of the adjusting piece I110 approaches to be parallel to the radial direction of the adjusting ring 121. When the adjusting ring 121 rotates around its own axis relative to the rectifier 200, the adjusting ring 121 can drive the adjusting piece I110 to swing, thereby changing the angle between the adjusting piece I110 and the cross section perpendicular to the axis of the rectifier 200, thereby changing the impact force of the water flow impacting the blades of the impeller 700 under the same flow rate condition, thereby changing the rotation speed of the impeller 700, and realizing the calibration of the flow error when the flow rate is represented by the number of rotations of the impeller 700.

[0051] Furthermore, there are multiple adjustment pieces Ⅰ110, and the multiple adjustment pieces Ⅰ110 are arranged at intervals along the circumference of the adjustment ring 121. Specifically, the multiple adjustment pieces Ⅰ110 are evenly distributed along the circumference of the adjustment ring 121, and the multiple adjustment pieces Ⅰ110 can be adjusted to deflect synchronously through the adjustment ring 121, so as to ensure that when the water flow impacts the impeller 700, the impact force received by the impeller 700 is evenly distributed in its circumference.

[0052] like Figure 2 , Figure 3 and Figure 4 As shown, the adjusting member Ⅰ120 also includes: a shaft member Ⅰ122, a swing arm 123 and a transmission member 124; one end of the swing arm 123 is connected to the shaft member Ⅰ122, the transmission member 124 is slidably hinged to the other end of the swing arm 123, and the transmission member 124 is connected to the adjusting ring 121.

[0053] The swing arm 123 can be driven to swing by screwing the shaft member I 122 , and the swing arm 123 drives the transmission member 124 . The transmission member 124 can drive the adjustment ring 121 to rotate by gear transmission or friction on the outer circumferential surface of the adjustment ring 121 .

[0054] In addition, a blocking piece 125 is installed on the bracket 300, and the blocking piece 125 abuts against the top end of the swing arm 123, and the blocking piece 125 cooperates with the circumferential surface of the shaft member Ⅰ122, so as to limit and fix the swing arm 123 and the shaft member Ⅰ122.

[0055] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, in an optional embodiment, the transmission member 124 includes: an axle pin 1241, an arm 1242 and a swing shaft 1243; one end of the arm 1242 is connected to the axle pin 1241, and the other end of the arm 1242 is connected to the swing shaft 1243, the axle pin 1241 is parallel to the swing shaft 1243, the axle pin 1241 is slidably hinged to the swing arm 123, and the swing shaft 1243 is connected to the adjustment ring 121.

[0056] Specifically, the bracket 300 is provided with a slide groove 304, and the swing shaft 1243 is slidably fitted in the slide groove 304. When the swing arm 123 is driven to swing, the swing arm 123 can drive the swing shaft 1243 to slide along the slide groove 304, and then drive the arm rod 1242 to move horizontally, and the arm rod 1242 drives the swing shaft 1243, thereby driving the adjustment ring 121 to rotate.

[0057] like Figure 1 , Figure 6 and Fig. 9 As shown, the rectifier 200 is installed on the bracket 300, and the bracket 300 is provided with a rectifier port 301, a branch port I 302 and a branch port II 303; the rectifier 200 is installed at the rectifier port 301; the flow error adjustment mechanism also includes: an adjustment component II 400 and an adjustment component III 500; the adjustment component II 400 is installed at the branch port I 302 to adjust the flow cross-sectional area of ​​the branch port I 302, and the adjustment component III 500 is installed at the branch port II 303 to adjust the flow cross-sectional area of ​​the branch port II 303.

[0058] It is installed in the case 600 through the flow error adjustment mechanism, and the rectifier port 301, the branch port I 302 and the branch port II 303 are all placed between the inlet 601 and the outlet 602. A part of the water flows through the rectifier 200 through the rectifier port 301, and the angle of the water flow relative to the impeller 700 blades is adjusted by the adjustment component I 100; the other part of the water flows to the outlet 602 through the branch port I 302 and the branch port II 303 respectively, and the diverted flow is adjusted by the adjustment component II 400 and the adjustment component III 500 respectively, thereby increasing the flow measurement range.

[0059] like Figure 1 , Figure 6 and Figure 7 As shown, the adjustment component II400 includes: an adjustment piece II410 and an adjustment member II420; the adjustment piece II410 is slidably connected to the bracket 300, and the adjustment piece II410 shields the branch opening I302; the adjustment member II420 is connected to the bracket 300 or the adjustment piece II410, and the adjustment member II420 is used to adjust and lock the adjustment piece II410.

[0060] In an optional embodiment, the adjustment member II 420 may include a bolt connected to the adjustment piece II 410, and the bolt is slidably matched with the slideway on the bracket 300. Loosening the bolt can drive it to slide along the slideway, thereby driving the adjustment piece II 410 to move in the branch opening I 302, thereby changing the area of ​​the branch opening I 302 covered by the adjustment piece II 410; after the adjustment is completed, the bolt can be locked to achieve the locking of the adjustment piece II 410. In addition, the adjustment member II 420 may also include a buckle. When the adjustment piece II 410 slides into place, the buckle is used to fix the adjustment piece II 410 to the bracket 300, thereby locking the adjustment piece II 410.

[0061] In this embodiment, the adjusting piece II 410 is connected to the rack 411, and the adjusting member II 420 includes: a gear 421 and a shaft member II 422 connected to the gear 421. The gear 421 can be driven by the rotation of the shaft member II 422, and the gear 421 is meshed with the rack 411, so that the adjusting piece II 410 can be driven to slide relative to the bracket 300, thereby changing the area of ​​the branch opening I 302 covered by the adjusting piece II 410. In addition, the shaft member II 422 is threadedly matched with a first plug cap 423, and tightening the first plug cap 423 can make the first plug cap 423 abut against the bracket 300, thereby realizing the relative locking of the shaft member II 422, the first plug cap 423 and the bracket 300.

[0062] like Figure 1 , Figure 6 and Figure 8 As shown, the adjustment component III500 includes: an adjustment piece III510 and an adjustment member III520; the adjustment piece III510 is swingably connected to the bracket 300, and the adjustment piece III510 shields the branch opening II303; the swing axis of the adjustment piece III510 is parallel to the adjustment piece III510, or the swing axis of the adjustment piece III510 coincides with the adjustment piece III510; the adjustment member III520 is connected to the bracket 300 and / or the adjustment piece III510, and the adjustment member III520 is used to adjust and lock the adjustment piece III510.

[0063] In an optional embodiment, the adjusting member III520 is connected to the bracket 300 or the adjusting piece III510, or the bracket 300 and the adjusting piece III510 are respectively connected to the adjusting member III520. The adjusting member III520 may be a bolt or a snap-fit ​​member, one of the bracket 300 and the adjusting piece III510 is connected to the bolt or the snap-fit ​​member, and the bolt or the snap-fit ​​member abuts against the other of the bracket 300 and the adjusting piece III510, so that the adjusting piece III510 is locked relative to the bracket 300.

[0064] In this embodiment, the adjusting member III520 includes: a shaft member III521 and a second plug cap 522 connected to the shaft member III521. The shaft member III521 is rotatably connected to the bracket 300, and one end of the shaft member III521 is connected to the adjusting piece III510. The adjusting piece III510 is driven to swing around the axis of the shaft member III521 by screwing the shaft member III521, thereby changing the area of ​​the branch opening II303 covered by the adjusting piece III510. By tightening the second plug cap 522, the second plug cap 522 can be abutted against the bracket 300, thereby locking the shaft member III521 to prevent the shaft member III521 and the second plug cap 522 from rotating relative to the bracket 300.

[0065] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, adjusting component Ⅰ100 can adjust the impact force on the blades of impeller 700, adjusting component Ⅱ400 adjusts the flow area of ​​branch port Ⅰ302 by means of translation of adjusting plate Ⅱ410, and adjusting component Ⅲ500 adjusts the flow area of ​​branch port Ⅱ303 by means of tilting adjusting plate Ⅲ510. The adjustment accuracy of adjusting component Ⅱ400 and adjusting component Ⅲ500 increases. The coordinated use of adjusting component Ⅰ100, adjusting component Ⅱ400 and adjusting component Ⅲ500 can not only expand the error adjustment range, but also make the flow performance curve of the water meter smoother.

[0066] like Figure 1 , Figure 2 , Figure 7 and Figure 8 and Fig. 9 As shown, the propeller-type water meter provided by the embodiment of the utility model includes: a meter case 600, an impeller 700 and the flow error adjustment mechanism recorded in the above-mentioned embodiment; the meter case 600 has an inlet 601 and an outlet 602, the impeller 700 is installed in the meter case 600, and the impeller 700 is driven to rotate by the water flow flowing from the inlet 601 to the outlet 602; the rectifier 200 is installed between the inlet 601 and the impeller 700, and the adjustment piece Ⅰ110 is opposite to the blades of the impeller 700.

[0067] During assembly, the rectifier 200, the regulating component II 400, the regulating component III 500 and the impeller 700 are respectively installed on the bracket 300, and then the assembly is installed inside the case 600 and placed between the inlet 601 and the outlet 602. A flange 800 is installed on the top of the case 600, and the bracket 300 is pressed and fixed by the flange 800.

[0068] The propeller-type water meter described in this embodiment has the technical effect of the above-mentioned flow error adjustment mechanism, which is beneficial to improving the flow accuracy and adjustable range of the water meter, and will not be repeated here.

[0069] The flow error adjustment method provided by the embodiment of the utility model is applicable to the propeller-type water meter, and adopts the flow error adjustment mechanism recorded in the above-mentioned embodiment; the flow error adjustment method includes: adjusting the swing of the adjustment piece I110 through the adjustment member I120 to change the angle between the water flow passing through the rectifier 200 and the blade of the impeller 700. In addition, the flow error adjustment method also includes driving and locking the adjustment piece II410 through the adjustment member II420, driving and locking the adjustment piece III510 through the adjustment member III520, and the adjustment components II400 and III500 are mainly used to adjust the small flow error, and the combination of the two can obtain a larger adjustment range; the adjustment component I100 is mainly used to adjust the large flow error, and the use of the adjustment component I100, the adjustment component II400 and the adjustment component III500 can not only expand the error adjustment range, but also make the flow performance curve of the water meter smoother.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A flow error adjustment mechanism, suitable for a propeller-type water meter, characterized in that: The flow error adjustment mechanism comprises an adjustment component I (100) installed on the rectifier (200); The adjustment assembly I (100) comprises: an adjustment sheet I (110) and an adjustment member I (120) connected to the adjustment sheet I (110); The regulating sheet I (110) is movably connected to the rectifier (200); The adjusting member I (120) is used to adjust the swing of the adjusting piece I (110) to change the inclination angle of the water flow passing through the rectifier (200).

2. The flow error adjustment mechanism according to claim 1, characterized in that: The adjusting member I (120) comprises an adjusting ring (121) rotatably connected to the rectifier (200); The adjusting piece I (110) is pivotally connected to the rectifier (200) around an axis extending radially along the adjusting ring (121), and the adjusting ring (121) is hinged to the adjusting piece I (110).

3. The flow error adjustment mechanism according to claim 2, characterized in that: A plurality of the adjustment plates I (110) are provided, and the plurality of adjustment plates I (110) are arranged at intervals along the circumferential direction of the adjustment ring (121).

4. The flow error adjustment mechanism according to claim 2 or 3, characterized in that: The adjusting member I (120) further comprises: a shaft member I (122), a swing arm (123) and a transmission member (124); One end of the swing arm (123) is connected to the shaft member I (122), the transmission member (124) is slidably hinged to the other end of the swing arm (123), and the transmission member (124) is connected to the adjustment ring (121).

5. The flow error adjustment mechanism according to claim 4, characterized in that: The transmission member (124) comprises: a shaft pin (1241), an arm (1242) and a swing shaft (1243); One end of the arm (1242) is connected to the shaft pin (1241), and the other end of the arm (1242) is connected to the swing shaft (1243). The shaft pin (1241) is parallel to the swing shaft (1243). The shaft pin (1241) is slidably hinged to the swing arm (123), and the swing shaft (1243) is connected to the adjustment ring (121).

6. The flow error adjustment mechanism according to claim 1, characterized in that: The rectifier (200) is installed on a bracket (300), and the bracket (300) is provided with a rectifier port (301), a branch port I (302), and a branch port II (303); The rectifier (200) is installed at the rectifier port (301); The flow error adjustment mechanism further includes: an adjustment component II (400) and an adjustment component III (500); The regulating assembly II (400) is installed at the branch port I (302) to adjust the flow cross-sectional area of ​​the branch port I (302); The regulating assembly III (500) is installed at the branch port II (303) to adjust the flow cross-sectional area of ​​the branch port II (303).

7. The flow error adjustment mechanism according to claim 6, characterized in that: The adjustment component II (400) comprises: an adjustment sheet II (410) and an adjustment member II (420); The adjusting piece II (410) is slidably connected to the bracket (300), and the adjusting piece II (410) shields the branch opening I (302); The adjusting member II (420) is connected to the bracket (300) or the adjusting piece II (410), and the adjusting member II (420) is used to adjust and lock the adjusting piece II (410).

8. The flow error adjustment mechanism according to claim 6, characterized in that: The adjustment component III (500) comprises: an adjustment sheet III (510) and an adjustment member III (520); The adjusting piece III (510) is swingably connected to the bracket (300), and the adjusting piece III (510) shields the branch opening II (303); The swing axis of the adjusting piece III (510) is parallel to the adjusting piece III (510), or the swing axis of the adjusting piece III (510) coincides with the adjusting piece III (510); The adjusting member III (520) is connected to the bracket (300) and / or the adjusting piece III (510), and the adjusting member III (520) is used to adjust and lock the adjusting piece III (510).

9. A propeller-type water meter, characterized in that: include: A case (600), an impeller (700), and a flow error adjustment mechanism as claimed in any one of claims 1 to 8; The housing (600) has an inlet (601) and an outlet (602), the impeller (700) is installed in the housing (600), and the impeller (700) is driven to rotate by water flowing from the inlet (601) to the outlet (602); The rectifier (200) is installed between the inlet (601) and the impeller (700), and the regulating piece I (110) is opposite to the blades of the impeller (700).

10. The propeller-type water meter according to claim 9, characterized in that: The rectifier (200) and the impeller (700) are respectively mounted on a bracket (300); a flange (800) is mounted on the housing (600), and the flange (800) is pressed and fixed to the bracket (300).

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