An improved stator soft end hoop for a hydrogenerator

Abstract

The present invention relates to the technical field of hydrogenerator manufacturing, and provides an improved stator soft end hoop for a hydrogenerator. The present invention is an improved stator soft end hoop for a hydrogenerator, comprising: a fiberglass rope assembly, a temperature measuring resistor, and a junction box. The temperature measuring resistors are uniformly arranged along the circumference of the end of the stator coil. The fiberglass rope assembly uniformly bonds the temperature measuring resistors arranged along the circumference of the end of the stator coil to the end of the stator coil. The temperature measuring resistors are connected to the junction box through leads provided on the stator coil frame. The present invention replaces the entire processing, welding, and bandaging processes of steel pipes or round steel, and also replaces the complicated processes of processing, welding and fixing, and installation and adjustment of the original end hoop support structure members. At the same time, the temperature measuring and monitoring system at the end of the stator is improved to ensure the safe operation of the unit.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing of hydro-generators, and particularly to an improved stator soft end hoop of a hydro-generator. Background Art

[0002] In the prior art, the end hoops of the stator of a hydro-generator mostly adopt a "rigid end hoop" structure made of steel pipes or round steel: a steel ring wrapped with insulation is used to bind and fix the end part of the stator coil, and is fixed on the tooth pressing plate through a rigid support structure.

[0003] For example, the present invention disclosed in the application number: CN201020623398.1 relates to a hydro-turbine motor component, and particularly to an adjustable stator end hoop support device. It mainly solves the technical problems existing in the prior art that during the operation of a hydro-generator unit, the stator coil will generate a radial displacement due to thermal expansion, and the end hoop cannot adapt to this displacement change, thus causing the end hoop to disengage from the stator coil, resulting in motor failures and low production efficiency.

[0004] Such traditional "rigid end hoops" have the following two deficiencies: First, in the normal operation state of the generator, the temperature rise in the middle section of the stator coil is higher than that at the end. However, when the generator operates in the leading power factor mode, local high temperatures will be generated in the metal structural parts at the end of the stator coil, and the temperature rise at its end is even higher than that in the middle section of the stator coil. In the design of medium and small-sized hydro-generators, temperature measuring resistors are only buried at the bottom of the stator coil slots and between two layers of stator coils to monitor the operating temperature of the middle section of the stator coil. However, when the generator operates in the leading power factor mode, there is a lack of necessary monitoring for the heat generation at the end of the stator coil; Second, when the space at the end of the stator coil is small, the installation of such a "rigid end hoop" is very difficult. Summary of the Invention

[0005] In order to solve the problems that in the normal operation state of the generator, the temperature rise in the middle section of the stator coil is higher than that at the end, but when the generator operates in the leading power factor mode, local high temperatures will be generated in the metal structural parts at the end of the stator coil, and the temperature rise at its end is even higher than that in the middle section of the stator coil. In the design of medium and small-sized hydro-generators, temperature measuring resistors are only buried at the bottom of the stator coil slots and between two layers of stator coils to monitor the operating temperature of the middle section of the stator coil. However, when the generator operates in the leading power factor mode, there is a lack of necessary monitoring for the heat generation at the end of the stator coil; when the space at the end of the stator coil is small, the installation of such a "rigid end hoop" is very difficult, the present invention provides an improved stator soft end hoop of a hydro-generator to solve this problem.

[0006] An improved stator soft end hoop for a hydrogenerator, comprising: a fiberglass rope assembly, a temperature measuring resistor, and a junction box. The temperature measuring resistors are uniformly arranged along the circumference of the end of the stator coil. The fiberglass rope assembly uniformly bonds the temperature measuring resistors arranged along the circumference of the end of the stator coil to the end of the stator coil. The temperature measuring resistors are connected to the junction box through leads provided on the stator coil frame.

[0007] Preferably, the fiberglass rope assembly comprises: a fiberglass rope and a fiberglass tube. The fiberglass tube binds the fiberglass rope, the temperature measuring resistor, and the end of the stator coil together to form an integral body.

[0008] Preferably, the diameter of the fiberglass rope is 28 - 30 mm. When in use, first immerse the fiberglass rope in a mixed organic solution of EP03 glue, curing agent 30, and acetone for 15 - 30 minutes.

[0009] Preferably, the EP03 glue, curing agent 30, and acetone are in a ratio of 5∶3∶2.

[0010] Preferably, the diameter of the fiberglass tube is 4 - 6 mm.

[0011] Preferably, the temperature measuring resistor is a Pt100 three - wire platinum thermal resistor.

[0012] An installation step for the improved stator soft end hoop of a hydrogenerator, and the installation steps are as follows:

[0013] S1: After the wire embedding work of the stator coil winding is completed, immerse the fiberglass rope in a mixed organic solution of EP03 glue, curing agent 30, and acetone for 15 - 30 minutes;

[0014] S2: At the end of the stator coil, uniformly arrange and install the temperature measuring resistors along the circumference of the stator coil, and use the fiberglass tube to bind the impregnated fiberglass rope, the temperature measuring resistors, and the end of the stator coil together;

[0015] S3: After 2 - 8 hours of curing, the impregnated fiberglass rope, the temperature measuring resistors, and the end of the stator coil are cured into an integral body;

[0016] S4: The temperature measuring resistors surround the stator coil frame and are led to the junction box through wires, and the overall installation of the soft end hoop is completed.

[0017] The advantages of the present invention are as follows: A φ30 fiberglass rope is adopted for fixing at the end of the stator coil. It is a non-metallic material itself and will not induce current and generate heat in the end magnetic field like a traditional steel ring. The fiberglass rope has good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, so there is no need to wrap insulating materials anymore. After the soft body of the fiberglass rope is impregnated with EP03 glue, curing agent 30, and acetone, it can make the fiberglass rope dissolve and cure better. After the fiberglass rope is tied to the coil, it is more fastened and has higher strength. When the end of the stator coil is tied and fixed to the soft fiberglass rope, only a φ5 fiberglass tube is used to fasten each coil to the φ30 fiberglass rope, without any support required by the steel end hoop ring. Its process structure is simple, and the operation is safe and reliable, especially suitable for installation in the narrow space at the end of the stator. The temperature measurement and monitoring system at the end of the stator is improved to ensure the safe operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the present invention;

[0019] 1. Fiberglass rope assembly; 2. Temperature measurement resistor; 3. Junction box; 4. Stator coil; 11. Fiberglass rope; 12. Fiberglass tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the installation methods and technical terms mentioned in the present invention are all well-known technical terms in the technical field, so no more explanations will be made. In addition, the same reference numerals are used for the same components, but this does not affect and should not constitute an accurate understanding of the technical solutions by those skilled in the art.

[0022] Example 1 will be described in combination with Figure 1 as follows:

[0023] An improved stator soft end hoop for a hydro-generator, comprising: a fiberglass rope assembly 1, a temperature measuring resistor 2, and a junction box 3. The temperature measuring resistors 2 are evenly arranged along the circumference of the end of the stator coil 4. The fiberglass rope assembly 1 evenly bonds the temperature measuring resistors 2 arranged along the circumference of the end of the stator coil 4 to the end of the stator coil 4. The temperature measuring resistors 2 are connected to the junction box 3 through leads provided on the stator frame of the stator coil 4. With such a setting, during use, the fiberglass rope assembly 1 is directly tied to the end of the stator coil 4. Along the circumference of the stator coil 4, temperature measuring resistors 2 are evenly installed at the end. When tying the end hoop ring, the fiberglass rope assembly 1, the temperature measuring resistors 2 and the end of the stator coil 4 form an integral body without the need for other support and fixation. The leads of the temperature measuring resistors 2 are wound around the stator frame of the stator coil 4 and connected to the monitoring system through the junction box 3.

[0024] Embodiment 2, on the basis of Embodiment 1, in combination with Figure 1 is described as follows:

[0025] The fiberglass rope assembly 1 includes: a fiberglass rope 11 and a fiberglass tube 12. The fiberglass tube 12 ties the fiberglass rope 11, the temperature measuring resistor 2, and the end of the stator coil 4 together to form an integral body. The diameter of the fiberglass rope 11 is 30 mm. During use, the fiberglass rope 11 is first impregnated in a mixed organic solution of EP03 glue, curing agent 30, and acetone for 30 minutes. With such a setting, the fiberglass rope 11 is impregnated with EP03 glue, curing agent 30, and acetone, and can be directly tied to the end of the stator coil 4 with the fiberglass tube 12.

[0026] Embodiment 3, on the basis of Embodiment 2, in combination with Figure 1 is described as follows:

[0027] EP03 glue, curing agent 30, and acetone are in a ratio of 5:3:2. With such a setting, this material is in a soft sticky state and cures after 28 hours of being soaked in the curing agent. After the soft body of the fiberglass rope 11 is impregnated with EP03 glue, curing agent 30, and acetone, it can make the fiberglass rope 11 better dissolve and cure. After being tied to the end of the stator coil 4, it is more fastened and has higher strength.

[0028] Embodiment 4, on the basis of Embodiment 3, in combination with Figure 1 is described as follows:

[0029] The diameter of the fiberglass tube 12 is 5 mm. With such a setting, when the end of the stator coil 4 is tied and fixed to the soft fiberglass rope 11, only the φ5 fiberglass tube is used to fasten each coil to the φ30 fiberglass rope 11, without the need for any support required by the steel end hoop ring. Its process structure is simple, and the operation is safe and reliable, especially suitable for installation in a narrow space at the end of the stator coil 4.

[0030] Embodiment 5, on the basis of Embodiment 4, in combination withFigure 1 Description:

[0031] The temperature - measuring resistor 2 is a Pt100 three - wire platinum thermal resistor. With such a setting, using the Pt100 three - wire platinum thermal resistor improves the temperature - measuring and monitoring system at the end of the stator coil 4, ensuring the safe operation of the unit.

[0032] Example 6, based on Example 5, combined with Figure 1 Description:

[0033] An installation procedure for an improved soft end - hoop of a hydro - generator stator, and its installation procedure is as follows:

[0034] S1: After the winding insertion work of the stator coil 4 is completed, immerse the fiberglass rope 11 in a mixed organic solution of EP03 glue, curing agent 30, and acetone for 15 - 30 minutes.

[0035] S2: At the end of the stator coil 4, evenly arrange and install the temperature - measuring resistor 2 along the circumference of the stator coil 4, and tie the impregnated fiberglass rope 11, temperature - measuring resistor 2, and the end of the stator coil 4 together with a fiberglass tube 12.

[0036] S3: After curing for 2 - 8 hours, the impregnated fiberglass rope 11, temperature - measuring resistor 2, and the end of the stator coil 4 are cured into a whole.

[0037] S4: The temperature - measuring resistor 2 surrounds the stator frame of the stator coil 4 and is led to the junction box 3 through a wire, and the overall installation of the soft end - hoop is completed.

[0038] Working principle of the present invention: An improved stator soft end hoop of a hydro-generator, wherein, temperature measuring resistors 2 are uniformly arranged along the circumference of the end of the stator coil 4, and the glass fiber rope assembly 1 uniformly bonds the temperature measuring resistors 2 arranged along the circumference of the end of the stator coil 4 to the end of the stator coil 4. The temperature measuring resistors 2 are connected to the junction box 3 through leads arranged on the stator coil frame. The glass fiber rope assembly 1 includes: a glass fiber rope 11 and a glass silk tube 12. The glass silk tube 12 binds the glass fiber rope 11, the temperature measuring resistors 2, and the end of the stator coil 4 together to form an integral body. After the winding insertion work of the stator coil 4 is completed, a φ30 glass fiber rope 11 of appropriate length is impregnated in a mixed organic solution of EP03 glue, curing agent 30, and acetone for about 15 to 30 minutes to form a finished product of the soft end hoop. At the end of the stator coil 4, the temperature measuring resistors 2 are uniformly arranged and installed along the circumference of the stator coil 4. The φ30 glass fiber rope 11, the temperature measuring resistors 2, and the end of the stator coil 4 are bound together with a φ5 glass silk tube 12. After completion, it is cured after 8 hours. The glass fiber rope 11 and the end of the stator coil 4 and its temperature measuring resistors 2 are cured into an integral body without other support and fixation. The leads of the temperature measuring resistors 2 are led to the junction box 3 around the stator coil frame, and the leads are laid according to the actual situation and fixed as necessary. It replaces the entire processing, welding, and wrapping process of steel pipes or round steel, and also replaces the complicated processes of processing, welding, fixing, and installation adjustment of the original end hoop support structure parts. The use of Pt100 three-wire platinum thermal resistors for the temperature measuring resistors 2 also improves the temperature measuring and monitoring system at the stator end to ensure the safe operation of the unit. The process structure of the present invention is simple, safe, and reliable, and is particularly suitable for installation in the narrow space at the end of the stator coil 4.

[0039] For those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0040] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. An improved stator soft end hoop for a hydrogenerator, characterized in that, it includes: a fiberglass rope assembly (1), a temperature measuring resistor (2) and a junction box (3). The temperature measuring resistors (2) are evenly arranged along the circumference of the end of the stator coil (4). The fiberglass rope assembly (1) evenly bonds the temperature measuring resistors (2) arranged along the circumference of the end of the stator coil (4) to the end of the stator coil (4). The temperature measuring resistors (2) are connected to the junction box (3) through leads provided on the stator frame of the stator coil (4); the fiberglass rope assembly (1) includes: a fiberglass rope (11) and a fiberglass tube (12). The fiberglass tube (12) binds the fiberglass rope (11), the temperature measuring resistor (2) and the end of the stator coil (4) together to form an integral body; the diameter of the fiberglass rope (11) is 28 - 30 mm. When in use, first immerse the fiberglass rope (11) in a mixed organic solution of EP03 glue, curing agent 30 and acetone for 15 - 30 minutes.

2. An improved stator soft end hoop for a hydrogenerator according to claim 1, characterized in that, EP03 glue, curing agent 30 and acetone are in a ratio of 5:3:

2.

3. An improved stator soft end hoop for a hydrogenerator according to claim 1, characterized in that, the diameter of the fiberglass tube (12) is 4 - 6 mm.

4. An improved stator soft end hoop for a hydrogenerator according to claim 1, characterized in that, the temperature measuring resistor (2) is a Pt100 three - wire platinum thermal resistor.

5. The installation steps of an improved stator soft end hoop for a hydrogenerator based on claim 1, and its installation steps are: S1: After the winding insertion work of the stator coil (4) is completed, immerse the fiberglass rope (11) in a mixed organic solution of EP03 glue, curing agent 30 and acetone for 15 - 30 minutes; S2: At the end of the stator coil (4), evenly arrange and install the temperature measuring resistors (2) along the circumference of the stator coil (4), and use the fiberglass tube (12) to bind the impregnated fiberglass rope (11), the temperature measuring resistor (2) and the end of the stator coil (4) together; S3: After curing for 2 - 8 hours, the impregnated fiberglass rope (11), the temperature measuring resistor (2) and the end of the stator coil (4) are cured into an integral body; S4: The temperature measuring resistor (2) surrounds the stator frame of the stator coil (4) and is led to the junction box (3) through a circuit, and the overall installation of the soft end hoop is completed.

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