Simple testing fixture for measuring diameters of excircles of odd number of blades of axial-flow type water pump impeller

Abstract

The utility model discloses a simple testing fixture for measuring diameters of excircles of odd number blades of an axial flow type water pump impeller, which relates to the technical field of impeller measurement, is matched with a feeler gauge for use and comprises a fixed block, a measuring circular groove is arranged on the fixed block, an impeller is arranged in the measuring circular groove, and the bottom of the impeller is attached to the inner wall of the measuring circular groove. A gap is reserved between the top of the impeller and the inner wall of the measuring circular groove, and a filler gauge is inserted into the gap; the simple testing fixture for measuring the excircle diameter of the odd number of blades of the axial-flow type water pump impeller can be used in cooperation with a filler gauge, and the excircle diameter of the odd number of blades of the axial-flow type water pump impeller can be rapidly and accurately measured.

Description

Technical Field

[0001] This utility model relates to the field of impeller measurement technology, specifically a simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial flow water pump impeller. Background Technology

[0002] Axial flow pumps are a type of vane pump, widely used in agricultural irrigation and drainage, municipal rainwater and sewage drainage, water conservancy projects, etc. Their working principle is that the blades of the rotating impeller apply force to the liquid, so that the liquid can be transported along the direction of the pump shaft.

[0003] In practical applications, the impeller is installed inside the guide component. When the impeller rotates, in order to prevent energy leakage in the high-pressure area, the single-sided gap between the outer diameter of the impeller blade and the inner diameter of the guide component is required to be controlled at about 10 microns. This will prevent friction with the guide component and energy loss, thus avoiding a reduction in efficiency and head.

[0004] After the impeller is machined, the outer diameter of the impeller blades needs to be measured to ensure that the blade dimensions meet production requirements. Commonly used measurement methods include vernier calipers, outside micrometers, common normal micrometers, and coordinate measuring machines.

[0005] In practice, when measuring the outer diameter of impeller blades using vernier calipers, outside micrometers, or common normal micrometers, it is required that the number of impeller blades be even to facilitate contact measurement with the measuring tools. However, axial flow pump impellers typically have three blades, evenly distributed around the perimeter. This makes it difficult for the aforementioned measuring tools to contact the outer diameter of any two blades, thus hindering effective measurement. Although a coordinate measuring machine (CMM) can be used for inspection, this method is costly and not suitable for actual mass production environments in workshops. Utility Model Content

[0006] The purpose of this invention is to provide a simple gauge for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller. This simple gauge can be used in conjunction with a feeler gauge to quickly and accurately measure the outer diameter of the blades of an axial-flow water pump impeller with an odd number of blades.

[0007] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a simple gauge for measuring the outer diameter of odd-numbered blades of an axial flow water pump impeller, used in conjunction with a feeler gauge, including a fixing block, a measuring groove on the fixing block, an impeller inside the measuring groove, the bottom of the impeller being attached to the inner wall of the measuring groove, and a gap between the top of the impeller and the inner wall of the measuring groove, into which a feeler gauge is inserted.

[0008] In some embodiments, the impeller includes a hub, two first blades are symmetrically arranged at the bottom of the hub, the first blades are in contact with the inner wall of the measuring groove, and a second blade is arranged at the top of the hub, with a gap between the second blade and the inner wall of the measuring groove.

[0009] In some embodiments, at least one third blade is provided between the first blade and the two second blades, and the first blade, the two second blades and the plurality of third blades are equally spaced.

[0010] In some embodiments, a positioning component is further provided in the measuring groove. The positioning component includes a positioning rod, which is arranged parallel to the axis of symmetry of the measuring groove. A positioning block is sleeved on the positioning rod, and a fixing rod is vertically provided on the positioning block. The fixing rod is coaxially arranged with the measuring groove, and the fixing rod is inserted into the wheel hub.

[0011] In some embodiments, the positioning assembly further includes a return spring, which is sleeved on the positioning rod and disposed between the positioning block and the inner wall of the measuring groove.

[0012] In some embodiments, the positioning assembly further includes two guide rods, which are symmetrically arranged on both sides of the positioning rod. Each guide rod is provided with a sliding sleeve, which is fixedly connected to the positioning block.

[0013] In some embodiments, the positioning component further includes a limiting ring disposed on the guide rod.

[0014] In summary, this utility model has the following beneficial effects:

[0015] This simple gauge for measuring the outer diameter of odd-numbered blades in an axial-flow water pump impeller works by placing the impeller in a measuring groove. The bottom of the impeller fits tightly against the inner wall of the groove, while a gap remains between the top of the impeller and the inner wall. This ensures that the impeller and the measuring groove are on the same axis of symmetry, converting the diameter difference between them into the height of the gap. When used with a feeler gauge, it allows for quick and accurate measurement of the outer diameter of odd-numbered blades in an axial-flow water pump impeller, thus determining whether the impeller blade outer diameter meets design requirements and ensuring product quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0017] Figure 2 This is a top view of Embodiment 1 of the present invention;

[0018] Figure 3Schematic structural diagram of Embodiment 2 of the present utility model;

[0019] Figure 4 Schematic structural diagram of Embodiment 2 of the present utility model with the impeller removed.

[0020] In the figure: 1, fixing block; 2, measuring circular groove; 3, impeller; 31, hub; 32, first blade; 33, second blade; 4, gap; 5, positioning component; 51, positioning rod; 52, positioning block; 53, fixing rod; 54, return spring; 55, guiding rod; 56, sliding sleeve; 57, limiting retaining ring. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1:

[0023] Refer to Figure 1-2 , a simple inspection tool for measuring the outer diameter of the odd-numbered blades of an axial-flow pump impeller, used in conjunction with a feeler gauge, including a fixing block 1. The fixing block 1 is the basic component of the entire inspection tool. The fixing block 1 can be a cylinder and can be made of tool steel. First, it is processed by turning, leaving a certain grinding allowance. After heat treatment to improve its hardness and wear resistance, it is then processed by grinding to ensure its dimensional accuracy and surface finish. A measuring circular groove 2 is provided on the fixing block 1. An impeller 3 is arranged in the measuring circular groove 2. The bottom of the impeller 3 is in close contact with the inner wall of the measuring circular groove 2, and there is a gap 4 between the top of the impeller 3 and the inner wall of the measuring circular groove 2. By the close contact between the impeller 3 and the inner wall of the measuring circular groove 2, the impeller 3 and the measuring circular groove 2 are located on the same axis of symmetry, thereby converting the diameter difference between the impeller 3 and the measuring circular groove 2 into the height of the gap 4 for easy measurement. A feeler gauge is inserted into the gap 4. By inserting feeler gauges of different sizes into the gap 4, the size of the gap 4 is obtained, and then the diameter difference between the impeller 3 and the measuring circular groove 2 is obtained. Subtracting the size of the gap 4 from the diameter of the measuring circular groove 2 gives the diameter of the impeller 3. Comparing the diameter value of the impeller 3 with the set value to determine whether the impeller 3 meets the production standard. If the diameter value of the impeller 3 conforms to the set value, it is qualified; if it exceeds, it is unqualified.

[0024] In some embodiments, the impeller 3 includes a hub 31, two first blades 32, and two second blades 33. The hub 31 is the central part of the impeller 3 and can support the two first blades 32 and the second blades 33. Two first blades 32 are symmetrically arranged at the bottom of the hub 31. The first blades 32 are in contact with the inner wall of the measuring groove 2, which can achieve the initial positioning of the impeller 3 and ensure that the impeller 3 and the measuring groove 2 are located on the same axis of symmetry. The second blades 33 are arranged at the top of the hub 31, and a gap 4 is left between the second blades 33 and the inner wall of the measuring groove 2.

[0025] In some embodiments, at least one third blade (not shown in the figure, but with the same structure as the first blade 32 and the second blades 33) is provided between the first blade 32 and the two second blades 33. The first blade 32, the two second blades 33, and the multiple third blades are arranged at equal intervals to ensure the stability and balance of the impeller during rotation. By adjusting the number of third blades, the number of blades in the impeller can be adjusted to meet different water pump requirements.

[0026] Example 2:

[0027] The difference between this embodiment and Embodiment 1 is that:

[0028] refer to Figure 3-4 The measuring groove 2 is further equipped with a positioning component 5, which includes a positioning rod 51, a positioning block 52, and a fixing rod 53. The positioning rod 51 is arranged parallel to the axis of symmetry of the measuring groove 2, providing a guide for the movement of the positioning block 52. The positioning block 52 is fitted onto the positioning rod 51 and can slide along the positioning rod 51 within a certain range. The positioning block 52 can be a disc, and the diameter of the disc is larger than the diameter of the hub 31. This provides a stable support platform for the impeller 3 when it is placed in the measuring groove 2, thereby improving the stability during measurement. The fixing rod 53 is vertically mounted on the positioning block 52 and is coaxially arranged with the measuring groove 2. The fixing rod 53 is inserted into the hub 31. This further positions the impeller 3, ensuring its accurate position in the measuring groove 2. The fixing rod 53 and the hub 31 can be fixedly connected by a key, preventing the hub 31 from rotating during measurement, thereby improving the measurement accuracy.

[0029] In some embodiments, the positioning assembly 5 further includes a return spring 54, which is sleeved on the positioning rod 51 and located between the positioning block 52 and the inner wall of the measuring groove 2. When measurement is required, the fixing rod 53 can be manually operated to move the positioning block 52 toward the gap 4. The return spring 54 is compressed and deformed, and the fixing rod 53 is inserted into the hub 31. When the impeller 3 is located in the measuring groove 2, the fixing rod 53 is released, the return spring 54 is reset, and a downward force is applied to the positioning block 52, thereby causing the hub 31 to tend to move downward, thus making the first blade 32 fit tightly against the inner wall of the measuring groove 2, improving the stability of positioning.

[0030] In some embodiments, the positioning component 5 further includes two guide rods 55 and a sliding sleeve 56. The two guide rods 55 are symmetrically arranged on both sides of the positioning rod 51. The guide rods 55 are provided with sliding sleeves 56. The sliding sleeves 56 are fixedly connected to the positioning block 52. By sliding the sliding sleeves 56, the stability of the positioning block 52 in the static state and when sliding can be improved, thereby improving the stability of the impeller 3 in the measuring groove 2 and improving the measurement accuracy.

[0031] In some embodiments, the positioning component 5 further includes a limiting ring 57, which is disposed on the guide rod 55. The limiting ring 57 can limit the sliding range of the sliding sleeve 56, thereby limiting the sliding range of the positioning block 52. When the sliding sleeve 56 is in contact with the limiting ring 57, the center of the positioning block 52 can coincide with the circle of the measuring groove 2, thereby facilitating the insertion of the hub 31 onto the fixing rod 53 and its placement in the measuring groove 2.

[0032] The specific working principle is as follows:

[0033] During the measurement, the fixing block 1 is placed flat on a stable workbench with the opening of the measuring groove 2 facing upwards. Then, the fixing rod 53 is manually operated to move the positioning block 52 along the positioning rod 51 towards the gap 4. The sliding sleeve 56 follows the positioning block 52 and slides on the guide rod 55 until the sliding sleeve 56 engages with the limiting ring 57, and the center of the positioning block 52 coincides with the center of the measuring groove 2. This ensures that the center of the hub 31 coincides with the center of the measuring groove 2, facilitating the placement of the impeller 3 within the measuring groove 2. During this process, the return spring 54 is compressed and deformed. The fixing rod 53 is then inserted into the hub 31, placing the hub 31 on the positioning block 52. Once the impeller 3 is fully positioned in the appropriate location within the measuring groove 2, the fixing rod 53 is released, the reset spring 54 is reset, and a downward force is applied to the positioning block 52, causing the hub 31 to tend to move downward. This allows the first blade 32 to fit tightly against the inner wall of the measuring groove, achieving the initial positioning of the impeller 3 and placing the impeller 3 and the measuring groove 2 on the same axis of symmetry.

[0034] Observe the gap 4 between the second blade 33 at the top of the impeller 3 and the inner wall of the measuring groove 2. Select feeler gauges of different thicknesses and insert them into this gap. During the process of trying to insert feeler gauges of different thicknesses, if a thinner feeler gauge can be easily inserted into the gap 4 while a thicker feeler gauge cannot, it indicates that the size of the gap 4 is within the set range. Subtract the thickness of the feeler gauge that can just be inserted into the gap 4 from the diameter of the measuring groove 2 to obtain the diameter of the impeller 3. Compare the obtained diameter value with the preset standard value. If the diameter value meets the set value, it indicates that the impeller meets the production standard and is judged as a qualified product; if it exceeds the set value, the impeller is judged as unqualified.

[0035] After the measurement is completed, manually operate the fixing rod 53 to move the positioning block 52 towards the gap 4. The return spring 54 is compressed again, pulling the hub 31 out of the fixing rod 53, thereby removing the impeller 3 from the measuring groove 2 and completing the measurement of the impeller diameter.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller, used in conjunction with a feeler gauge, characterized in that: Includes a fixing block (1), the fixing block (1) is provided with a measuring groove (2), the measuring groove (2) is provided with an impeller (3), the bottom of the impeller (3) is attached to the inner wall of the measuring groove (2), and a gap (4) is left between the top of the impeller (3) and the inner wall of the measuring groove (2), and a feeler gauge is inserted into the gap (4).

2. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 1, characterized in that: The impeller (3) includes a hub (31), and two first blades (32) are symmetrically arranged at the bottom of the hub (31). The first blades (32) are in contact with the inner wall of the measuring groove (2). The top of the hub (31) is provided with a second blade (33), and a gap (4) is left between the second blade (33) and the inner wall of the measuring groove (2).

3. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 2, characterized in that: At least one third blade is provided between the first blade (32) and the two second blades (33), and the first blade (32), the two second blades (33) and the multiple third blades are arranged at equal intervals.

4. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 2, characterized in that: The measuring groove (2) is also provided with a positioning component (5). The positioning component (5) includes a positioning rod (51). The positioning rod (51) is arranged parallel to the axis of symmetry of the measuring groove (2). A positioning block (52) is sleeved on the positioning rod (51). A fixing rod (53) is vertically provided on the positioning block (52). The fixing rod (53) is coaxially arranged with the measuring groove (2), and the fixing rod (53) is inserted into the hub (31).

5. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 4, characterized in that: The positioning component (5) also includes a reset spring (54), which is sleeved on the positioning rod (51) and located between the positioning block (52) and the inner wall of the measuring groove (2).

6. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 5, characterized in that: The positioning component (5) also includes two guide rods (55), which are symmetrically arranged on both sides of the positioning rod (51). The guide rods (55) are provided with sliding sleeves (56), which are fixedly connected to the positioning block (52).

7. A simple measuring tool for measuring the outer diameter of odd-numbered blades of an axial-flow water pump impeller according to claim 6, characterized in that: The positioning component (5) further includes a limiting ring (57), which is disposed on the guide rod (55).

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