Auxiliary measuring tool for coaxiality of turbine runner and measuring method thereof

Abstract

The invention discloses an auxiliary measuring tool for the coaxiality of a water turbine runner and a measuring method thereof. The auxiliary measuring tool for the coaxiality of the water turbine runner comprises a fastening piece, a supporting piece, a piano wire, a heavy punch, an oil drum and an inside micrometer. The method comprises the following steps: placing a water turbine runner on a horizontal plane, and horizontally adjusting the water turbine runner to be within 0.02 mm / m; the water turbine main shaft is connected with the water turbine runner through a fastener, and the perpendicularity of the water turbine main shaft is adjusted to be within 0.02 mm / m; supporting pieces are symmetrically installed on the journal of the water turbine main shaft in the XY direction, one end of a piano wire is fixedly wound around the top ends of the supporting pieces, and a heavy hammer is arranged at the other end of the piano wire and suspended in the oil drum. The shortest distance from the water turbine main shaft neck to the piano line, the shortest distance from the water turbine runner crown to the piano line and the shortest distance from the water turbine runner lower ring to the piano line are measured through the inside micrometer, compared with auxiliary measurement conducted by manufacturing a circle measuring frame on site, more labor is saved, consumed time is shorter, and the overhaul period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine runner coaxiality measurement, and in particular to an auxiliary measuring tool for water turbine runner coaxiality and a measuring method thereof. Background Art

[0002] During the daily operation of the turbine runner, due to the long-term scouring of the water flow, cavitation is prone to occur in the blades, comb teeth and other parts. The runner usually needs to be reprocessed during the unit maintenance. The coaxiality of the runner and the turbine main shaft is one of the important factors affecting the stable operation of the unit in the later stage. The traditional coaxiality detection of the turbine runner and the turbine main shaft usually adopts the method of making a circle measuring frame to assist in measurement. Because the size and shape of the turbine runner and the turbine main shaft of each unit are often inconsistent, it is necessary to make a corresponding circle measuring frame on site according to the size and shape of the runner and the turbine main shaft for auxiliary measurement. However, the on-site production of the circle measuring frame is not only time-consuming and labor-intensive, but also difficult to find materials for production, resulting in a long maintenance period. Summary of the invention

[0003] The purpose of the present invention is to design an auxiliary measuring tool for the coaxiality of a turbine runner in order to solve the above-mentioned problem.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: Auxiliary measuring tool for turbine runner coaxiality, including: A fastener used to connect the main shaft of a water turbine to a water turbine runner placed on a horizontal surface; A support member is provided in the symmetrical XY direction of the main shaft journal of the turbine; A piano wire, a weight, an oil drum and an inner diameter micrometer, wherein the oil drum is arranged directly below the piano wire, one end of the piano wire is fixedly wound around the top of the support, and the other end of the piano wire is provided with the weight, which is suspended in the oil drum; The inside micrometer is used to measure the shortest distance from the turbine main shaft journal to the piano wire, the shortest distance from the turbine runner upper crown to the piano wire, and the shortest distance from the turbine runner lower ring to the piano wire.

[0005] The present invention further provides a method for measuring the coaxiality of a water turbine runner, which is applied to the auxiliary measuring tool for the coaxiality of a water turbine runner. The method for measuring the coaxiality of a water turbine runner comprises the following steps: Use an inside micrometer to measure the shortest distance from the turbine main shaft journal to the piano wire and use it as the reference dimension; The shortest distance from the crown of the turbine runner to the piano wire is measured by an inside micrometer and used as the first dimension; The shortest distance from the turbine runner lower ring to the piano wire is measured by an inside micrometer and used as the second dimension; The shortest distance from the turbine runner crown to the turbine main shaft journal is obtained by subtracting the first dimension from the reference dimension; The shortest distance from the turbine runner lower ring to the turbine main shaft journal is obtained by subtracting the second dimension from the reference dimension.

[0006] The beneficial effects of the present invention are: The auxiliary measuring tool for the coaxiality of the turbine runner places the turbine runner on a horizontal plane and adjusts the horizontal position of the turbine runner to within 0.02mm / m; the turbine main shaft is connected to the turbine runner by fasteners, and the verticality of the turbine main shaft is adjusted to within 0.02mm / m; supports are installed on the turbine main shaft neck symmetrically in the XY directions, one end of the piano wire is fixedly wound around the top of the support, and a weight is provided on the other end of the piano wire, and the weight is suspended in the oil drum; the shortest distance from the turbine main shaft neck to the piano wire, the shortest distance from the turbine runner upper crown to the piano wire, and the shortest distance from the turbine runner lower ring to the piano wire are measured by an inside micrometer. Compared with on-site production of a measuring circle frame for auxiliary measurement, it is more labor-saving and time-consuming, so as to quickly solve the problem of measuring the coaxiality of the turbine runner and the turbine main shaft, thereby shortening the maintenance period. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the auxiliary measuring tool for the coaxiality of the turbine runner of the present invention; Figure 2 It is a schematic flow chart of the method for measuring the coaxiality of a turbine runner of the present invention; In the figure: 1-support rod, 2-turbine main shaft, 3-inside micrometer, 4-turbine runner, 5-piano wire, 6-weight, 7-oil drum. DETAILED DESCRIPTION

[0008] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0009] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0011] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0012] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1-2 As shown in the figure, the auxiliary measuring tool for the coaxiality of the turbine runner includes: A fastener used to connect the turbine main shaft 2 with the turbine runner 4 placed on a horizontal plane; A support member is provided in the symmetrical XY direction of the journal of the main shaft 2 of the turbine; A piano wire 5, a weight 6, an oil drum 7 and an inner diameter micrometer 3, wherein the oil drum 7 is arranged directly below the piano wire 5, one end of the piano wire 5 is fixedly wound around the top of the support, and the other end of the piano wire 5 is provided with the weight 6, and the weight 6 is suspended in the oil drum 7; The inside micrometer 3 is used to measure the shortest distance from the journal of the turbine main shaft 2 to the piano wire 5, the shortest distance from the upper crown of the turbine runner 4 to the piano wire 5, and the shortest distance from the lower ring of the turbine runner 4 to the piano wire 5.

[0016] In one embodiment, the support member comprises a support rod 1 .

[0017] In one embodiment, the support rod 1 is a T-shaped structure.

[0018] In one embodiment, the fastener is a coupling bolt.

[0019] In this embodiment, the fastener can be implemented by a coupling bolt, which is a fastener connecting the two half couplings in the shaft system, and is composed of a screw and a nut. The coupling bolt can connect the turbine main shaft 2 with the turbine runner 4. The coupling bolt should be tightened evenly and symmetrically during pre-tightening, and the verticality of the turbine main shaft 2 should be adjusted within 0.02mm / m; the support member can be implemented by a T-shaped support rod 1 with sufficient rigidity and strength. The support rod 1 is installed in the XY direction of the symmetrical shaft neck of the turbine main shaft 2, and the support rod 1 can be fixed above the turbine main shaft 2 by tightening the screw; the weight 6 at the other end of the piano wire 5 is suspended in the oil drum 7 to increase the buoyancy of the weight 6 to stabilize the weight 6, so that the piano wire 5 is vertical to prevent wind from affecting the measurement accuracy and reduce the measurement error.

[0020] When the inside micrometer 3 is used for measurement in this embodiment, the measuring points on the same side should be located on the same straight line; during the measurement process, both ends of the inside micrometer 3 need to be slightly moved to measure the shortest distance from the measuring point to the piano wire 5.

[0021] The auxiliary measuring tool for the coaxiality of the turbine runner of the present invention places the turbine runner 4 on a horizontal plane and adjusts the turbine runner 4 horizontally to within 0.02 mm / m; the turbine main shaft 2 is connected to the turbine runner 4 by a fastener, and the verticality of the turbine main shaft 2 is adjusted to within 0.02 mm / m; a support is installed on the journal of the turbine main shaft 2 in symmetrical XY directions, one end of the piano wire 5 is fixedly wound around the top of the support, and a weight 6 is provided at the other end of the piano wire 5, and the weight 6 is suspended in the oil drum 7; the shortest distance from the journal of the turbine main shaft 2 to the piano wire 5, the shortest distance from the crown of the turbine runner 4 to the piano wire 5, and the turbine The shortest distance from the lower ring of the runner 4 to the piano wire 5 is obtained by subtracting the shortest distance from the upper crown of the turbine runner 4 to the journal of the turbine main shaft 2 from the shortest distance from the journal of the turbine main shaft 2 to the piano wire 5, and the shortest distance from the lower ring of the turbine runner 4 to the piano wire 5 is obtained by subtracting the shortest distance from the lower ring of the turbine runner 4 to the journal of the turbine main shaft 2 from the shortest distance from the journal of the turbine main shaft 2 to the piano wire 5. Compared with the on-site production of a circular measuring frame for auxiliary measurement, it is more labor-saving and time-consuming, so as to quickly solve the problem of coaxiality measurement between the turbine runner 4 and the turbine main shaft 2, thereby shortening the maintenance period.

[0022] In one embodiment, the auxiliary measuring tool for the coaxiality of the turbine runner further includes an insulating member, and the insulating member is cushioned between the supporting member and the turbine main shaft 2 .

[0023] In this embodiment, the insulating member is provided at the surface contact portion between the support rod 1 and the main shaft 2 of the turbine to isolate the current loop.

[0024] The present invention also provides a method for measuring the coaxiality of a water turbine runner. The method is applied to the auxiliary measuring tool for the coaxiality of the water turbine runner. The method comprises the following steps: The shortest distance from the journal of the turbine main shaft 2 to the piano wire 5 is measured by an inside micrometer 3 and used as a reference dimension; The shortest distance from the crown of the turbine runner 4 to the piano wire 5 is measured by an internal micrometer 3 and used as a first dimension; The shortest distance from the lower ring of the turbine runner 4 to the piano wire 5 is measured by an internal micrometer 3 and used as the second dimension; The shortest distance from the crown of the turbine runner 4 to the journal of the turbine main shaft 2 is obtained by subtracting the first dimension from the reference dimension; The shortest distance from the lower ring of the turbine runner 4 to the journal of the turbine main shaft 2 is obtained by subtracting the second dimension from the reference dimension.

[0025] In this embodiment, an auxiliary measuring tool for the coaxiality of the turbine runner is installed; first, the inside micrometer 3 is used to measure the shortest distance from the journal of the turbine main shaft 2 to the piano wire 5 as a reference size, and then the shortest distance from the upper crown of the turbine runner 4 to the piano wire 5 is measured as the first size, and the shortest distance from the lower ring of the turbine runner 4 to the piano wire 5 is measured as the second size. Finally, the shortest distance from the upper crown of the turbine runner 4 to the journal of the turbine main shaft 2 is obtained by subtracting the first size from the reference size, and the shortest distance from the lower ring of the turbine runner 4 to the journal of the turbine main shaft 2 is obtained by subtracting the second size from the reference size. Compared with on-site production of a circular measuring frame for auxiliary measurement, this method is more labor-saving and time-consuming, so as to quickly solve the problem of measuring the coaxiality of the turbine runner 4 and the turbine main shaft 2, thereby shortening the maintenance period. In addition, when using the inside micrometer 3 for measurement, the measuring points on the same side should be located on the same straight line; and during the measurement process, the two ends of the inside micrometer 3 need to be slightly moved until the shortest distance from the measuring point to the piano wire 5 is measured.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary measuring tool for the coaxiality of a turbine runner, characterized in that: The auxiliary measuring tool for the coaxiality of the turbine runner comprises: A fastener used to connect the main shaft of a water turbine to a water turbine runner placed on a horizontal surface; A support member is provided in the symmetrical XY direction of the main shaft journal of the turbine; A piano wire, a weight, an oil drum and an inner diameter micrometer, wherein the oil drum is arranged directly below the piano wire, one end of the piano wire is fixedly wound around the top of the support, and the other end of the piano wire is provided with the weight, which is suspended in the oil drum; The inside micrometer is used to measure the shortest distance from the turbine main shaft journal to the piano wire, the shortest distance from the turbine runner upper crown to the piano wire, and the shortest distance from the turbine runner lower ring to the piano wire.

2. The auxiliary measuring tool for the coaxiality of a turbine runner according to claim 1 is characterized in that: The support member includes a support rod.

3. The auxiliary measuring tool for the coaxiality of a turbine runner according to claim 2 is characterized in that: The support rod is a T-shaped structure.

4. The auxiliary measuring tool for the coaxiality of a turbine runner according to claim 2 is characterized in that: The auxiliary measuring tool for the coaxiality of the turbine runner also includes an insulating member, and the insulating member is cushioned between the supporting member and the main shaft of the turbine.

5. The auxiliary measuring tool for the coaxiality of a turbine runner according to claim 1, characterized in that: The fastener is a coupling bolt.

6. A method for measuring the coaxiality of a water turbine runner, applied to the auxiliary measuring tool for the coaxiality of a water turbine runner as claimed in any one of claims 1 to 5, characterized in that: The method for measuring the coaxiality of a water turbine runner comprises the following steps: Use an inside micrometer to measure the shortest distance from the turbine main shaft journal to the piano wire and use it as the reference dimension; The shortest distance from the crown of the turbine runner to the piano wire is measured by an inside micrometer and used as the first dimension; The shortest distance from the turbine runner lower ring to the piano wire is measured by an inside micrometer and used as the second dimension; The shortest distance from the turbine runner crown to the turbine main shaft journal is obtained by subtracting the first dimension from the reference dimension; The shortest distance from the turbine runner lower ring to the turbine main shaft journal is obtained by subtracting the second dimension from the reference dimension.

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