Generator stator base with double coolers at top

Abstract

The utility model provides a generator stator frame with double coolers at the top, the stator frame is in a hollow cylindrical shape, the stator frame comprises an excitation end frame and a steam end frame, the excitation end frame and the steam end frame are welded and fixed, a stator cavity used for installing a stator assembly is arranged in the middle of the stator frame, and the stator assembly is arranged in the stator cavity. A group of mounting cavities are arranged at the upper part of the stator base, the mounting cavities are symmetrically arranged and are as long as the stator base, coolers are arranged in the mounting cavities, a cooling circulation cavity is arranged at the upper part of the stator base, the cooling circulation cavity is respectively communicated with the mounting cavities and the stator cavity, and the mounting cavities are also communicated with the stator cavity. The cooler is integrated on the top of the stator base, the occupied area is small, the length of the cooler is basically equal to that of the stator base, and the heat exchange area is larger; the cooling medium can enter from the two ends of the stator base at the same time and exchange heat with the stator assembly, and the cooling effect is better and more uniform.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy generator equipment, in particular to a stator frame of a generator with double top coolers. Background Art

[0002] During generator operation, a significant amount of internal losses can be broadly categorized into three types: copper loss, iron loss, and mechanical loss. Copper loss refers to the resistance loss caused by current flowing through the stator and rotor windings. The skin effect of the wires within the stator slots also causes additional losses. Iron loss is the loss generated by the core teeth and yoke. It comes in two forms: eddy current loss and hysteresis loss. Mechanical loss is caused by friction between the moving and the stationary elements. The losses generated during generator operation are converted into heat. To ensure that the generator temperature does not exceed the limit temperature corresponding to the insulation heat resistance rating and to ensure reliable operation, the motor's heat dissipation capacity should be improved to suppress the rise in motor temperature.

[0003] The existing stator cooling structure is mounted on the end of the stator frame, pumping the cooling medium through the cooler to the other end. After heat exchange, the medium returns to the cooler for further heat exchange. However, this structure has two problems. First, the stator cooling structure is mounted on the end of the stator frame, which undoubtedly increases the overall volume of the unit and requires a larger area. Second, the cooling medium only flows from one end to the other, so the cooling effect is inevitably poor in the part away from the cooler.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a top dual-cooler generator stator frame, which integrates the cooler at the top of the stator frame, occupies a small area, and is basically the same length as the stator frame, with a larger heat exchange area; the cooling medium can enter from both ends of the stator frame at the same time and exchange heat with the stator assembly, and its cooling effect is better and more uniform.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a top double-cooler generator stator frame, the stator frame is a hollow cylindrical shape, the stator frame includes an excitation end frame and a steam end frame, the excitation end frame and the steam end frame are welded and fixed, the middle of the stator frame is a stator cavity for installing the stator assembly, the upper part of the stator frame is provided with a group of installation cavities, the installation cavities are symmetrically arranged and have the same length as the stator frame, a cooler is installed in the installation cavity, the upper part of the stator frame is provided with a cooling circulation cavity, the cooling circulation cavity is respectively connected with the installation cavity and the stator cavity, and the installation cavity is also connected with the stator cavity.

[0007] Furthermore, the bottom of the mounting cavity is connected to the stator cavity, the top of the mounting cavity is connected to the cooling circulation cavity, and both axial ends of the cooling circulation cavity are connected to the stator cavity. Heat generated by the generator operation is carried by hydrogen into the mounting cavity, passes through the cooler for heat exchange, and then enters the cooling circulation cavity. It then enters the stator cavity through both ends of the cooling circulation cavity to exchange heat with the heating element, forming a circulating air path.

[0008] Furthermore, an arc-shaped outlet box is provided on the top of the excitation end base, and an outlet bushing is installed on the outlet box. The bottom of the outlet bushing is connected to a cooling elbow, and the other end of the cooling elbow extends into the stator cavity. Fans are provided at both ends of the stator assembly, and the air outlet directions of the two fans are opposite to each other and axial, and the cooling elbow is located in the air outlet direction of the fan. Since the air outlet directions of the two fans are relative, the part between the two fans is positive pressure, and the back of the fan is negative pressure. The cooling medium in the cooling circulation cavity is blown toward the stator assembly through the fan for heat exchange, and a part of the cooling medium is blown into the cooling elbow and enters the outlet bushing for heat exchange. After the heat exchange is completed, the cooling medium will enter the installation cavity under the action of positive pressure to exchange heat with the cooler.

[0009] Furthermore, base plates are provided on both sides of the stator base, and the base plates are welded to the stator base through reinforcing ribs. Hanging brackets are also provided on both sides of the stator base, and the hanging brackets are symmetrically arranged and there are at least four of them.

[0010] Furthermore, both ends of the installation cavity are blocked by cooler cover plates, and both ends of the stator cavity are blocked by end covers, so that the interior of the stator base is a sealed cavity as a whole.

[0011] Furthermore, the stator base is provided with temperature measurement lead boxes and inspection manholes on both sides. The temperature measurement lead boxes are located at both axial ends of the stator base, and the inspection manhole is located between the temperature measurement lead boxes. There are at least four temperature measurement lead boxes and at least six inspection manholes. The bottom of the stator base is also provided with a plurality of drainage holes. The internal temperature is detected through the temperature measurement lead boxes.

[0012] Furthermore, the cooler is positioned along the length of the stator frame, increasing its contact surface with the cooling medium. The cooling medium within the stator frame is hydrogen. All heating elements are cooled by hydrogen, which has a high thermal conductivity and can quickly dissipate heat from the generator, resulting in high cooling efficiency.

[0013] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0014] 1. This utility model provides a top-mounted dual-cooler generator stator frame. The cooler is integrated into the top of the stator frame, resulting in a small footprint and a length roughly the same as the stator frame, providing a larger heat exchange area. Cooling medium can enter the stator frame from both ends simultaneously and exchange heat with the stator assembly, resulting in a better and more uniform cooling effect.

[0015] 2. The heating elements in the present invention are all cooled by hydrogen as a cooling medium. Hydrogen has a large thermal conductivity and can quickly conduct heat from the generator, resulting in high cooling efficiency.

[0016] 3. The stator frame of the present invention is welded by the excitation end frame and the steam end frame, and the intermediate frame is discarded, which can effectively ensure the concentricity of the excitation end frame and the steam end frame after connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a stator frame of a top double-cooler generator according to the present invention;

[0018] Figure 2 This is an axial cross-sectional view of a stator frame of a top dual-cooler generator according to the present invention;

[0019] Figure 3 This is a top view of a stator frame of a top double-cooler generator according to the present invention;

[0020] Figure 4 This is an axial cross-sectional view of a stator frame of a top dual-cooler generator according to the present invention (stator assembly omitted);

[0021] Figure 5 This is a radial cross-sectional view of a stator frame of a top dual-cooler generator described in the present invention (stator assembly omitted).

[0022] In the figure: 1-excitation end base, 11-outlet box, 12-outlet bushing, 13-cooling elbow, 2-steam end base, 3-installation cavity, 31-cooler cover, 5-cooling circulation cavity, 6-fan, 7-base plate, 8-hanging ladder, 9-end cover, 100-temperature measurement lead box, 101-inspection manhole, 102-drain hole. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5The stator frame of a top double-cooler generator is shown. The stator frame is in the shape of a hollow cylinder. The stator frame includes an excitation end frame 1 and a steam end frame 2. The excitation end frame 1 and the steam end frame 2 are welded and fixed. The middle of the stator frame is a stator cavity for installing the stator assembly. The upper part of the stator frame is provided with a group of mounting cavities 3. The mounting cavities 3 are symmetrically arranged and have the same length as the stator frame. A cooler is installed in the mounting cavity 3. The upper part of the stator frame is provided with a cooling circulation cavity 5. The cooling circulation cavity 5 is connected to the mounting cavity 3 and the stator cavity respectively. The mounting cavity 3 is also connected to the stator cavity. The cooler is integrated at the top of the stator frame, occupies a small area, and is basically the same length as the stator frame, with a larger heat exchange area. The cooling medium can enter from both ends of the stator frame at the same time and exchange heat with the stator assembly, and its cooling effect is better and more uniform.

[0025] like Figure 4 、 Figure 5 As shown, the bottom of the mounting cavity 3 is connected to the stator cavity, the top of the mounting cavity 3 is connected to the cooling circulation cavity 3, and both axial ends of the cooling circulation cavity 3 are connected to the stator cavity. The cooling medium enters from both ends of the stator frame, which provides a better cooling effect than entering from only one side, and the cooling effect is basically the same in all parts.

[0026] like Figure 2 、 Figure 3 As shown, an arc-shaped outlet box 11 is provided on the top of the excitation end base 1, and an outlet bushing 12 is installed on the outlet box 11. The bottom of the outlet bushing 12 is connected to a cooling elbow 13, and the other end of the cooling elbow 13 extends into the stator cavity.

[0027] Fans 6 are provided at both ends of the stator assembly. The air outlet directions of the two fans 6 are opposite to each other and are axial. The cooling elbow 13 is located in the air outlet direction of the fans 6 .

[0028] Because the two fans 6 are oriented in opposite directions, the area between the two fans 6 is under positive pressure, while the area behind the fans 6 is under negative pressure. The cooling medium in the cooling circulation chamber 5 is blown toward the stator assembly by the fans 6 for heat exchange. A portion of the cooling medium is blown into the cooling elbow 13 and into the outlet bushing 12 for heat exchange. After the heat exchange is complete, the cooling medium, under the action of positive pressure, enters the installation chamber 3 again for heat exchange with the cooler.

[0029] like Figure 1 As shown, the stator base is provided with foot plates 7 on both sides, welded to the stator base via reinforcing ribs. Also provided on both sides are lifting hooks 8, symmetrically arranged and at least four in number. Support from the ground is achieved by installing machine feet beneath the foot plates 7, and the lifting hooks 8 are used during the hoisting process.

[0030] According to a further optimized solution, both ends of the installation cavity 3 are blocked by a cooler cover 31 , and both ends of the stator cavity are blocked by an end cover 9 , so that the interior of the stator frame is a sealed cavity as a whole.

[0031] like Figure 1 、 Figure 2 As shown, the stator base is also provided with temperature measurement lead boxes 100 and inspection manholes 101 on both sides. The temperature measurement lead boxes 100 are located at both axial ends of the stator base, and the inspection manholes 101 are located between the temperature measurement lead boxes 100. There are at least four temperature measurement lead boxes 100 and at least six inspection manholes 101. The bottom of the stator base is also provided with a plurality of drainage holes 102. The temperature measurement lead boxes 100 are located precisely on the cooling air path, and their internal temperature can be measured. The provision of multiple inspection manholes 101 facilitates maintenance of various parts by staff. Waste and debris generated by the unit operation are discharged through the drainage holes 102.

[0032] Preferably, the cooler is arranged along the length direction of the stator frame, and the cooling medium in the stator frame is hydrogen.

[0033] The working principle of the stator frame of a top double-cooler generator provided by the utility model is as follows:

[0034] When the unit is running, the fan 6 on the stator assembly runs, the front of the fan 6 is positive pressure and the back is negative pressure. The heat generated by the stator assembly enters the installation cavity 3 under the action of the positive pressure of the fan 6, and exchanges heat with the cooler and then cools the circulation cavity 5. The low-temperature cooling medium is continuously accumulated in the cooling circulation cavity and finally blown downward from both ends into the stator cavity under the action of the negative pressure of the fan 6. A part of it enters the cooling elbow, fully exchanges heat with the heating elements in the unit, and then enters the cooler under the action of the positive pressure of the fan 6, and the cycle continues.

[0035] 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 can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A top double cooler generator stator frame, characterized by: The stator base is in the shape of a hollow cylinder. The stator base includes an excitation end base (1) and a steam end base (2). The excitation end base (1) and the steam end base (2) are welded and fixed. The middle of the stator base is a stator cavity for installing the stator assembly. The upper part of the stator base is provided with a group of mounting cavities (3). The mounting cavities (3) are symmetrically arranged and have the same length as the stator base. A cooler is installed in the mounting cavity (3). The upper part of the stator base is provided with a cooling circulation cavity (5). The cooling circulation cavity (5) is communicated with the mounting cavity (3) and the stator cavity respectively. The mounting cavity (3) is also communicated with the stator cavity.

2. The stator frame of a top double cooler generator according to claim 1, characterized in that: The bottom of the installation cavity (3) is in communication with the stator cavity, the top of the installation cavity (3) is in communication with the cooling circulation cavity (5), and the axial ends of the cooling circulation cavity (5) are in communication with the stator cavity.

3. The stator frame of a top double cooler generator according to claim 1, characterized in that: An arc-shaped outlet box (11) is provided on the top of the excitation end machine base (1), an outlet bushing (12) is installed on the outlet box (11), the bottom of the outlet bushing (12) is connected to a cooling elbow (13), and the other end of the cooling elbow (13) extends into the stator cavity.

4. The stator frame of a top double-cooler generator according to claim 3, characterized in that: Fans (6) are provided at both ends of the stator assembly, the air outlet directions of the two fans (6) are opposite to each other and are axial, and the cooling elbow (13) is located in the air outlet direction of the fans (6).

5. The stator frame of a top double-cooler generator according to claim 1, characterized in that: Base plates (7) are provided on both sides of the stator base, and the base plates (7) are welded to the stator base via reinforcing ribs. Hanging brackets (8) are also provided on both sides of the stator base, and the hanging brackets (8) are symmetrically arranged and are at least four in number.

6. The stator frame of a top double cooler generator according to claim 1, characterized in that: Both ends of the installation cavity (3) are blocked by cooler cover plates (31), and both ends of the stator cavity are blocked by end covers (9), and the interior of the stator base is a sealed cavity as a whole.

7. The stator frame of a top double-cooler generator according to claim 1, characterized in that: Temperature measuring lead boxes (100) and inspection manholes (101) are also provided on both sides of the stator base. The temperature measuring lead boxes (100) are located at both axial ends of the stator base, and the inspection manholes (101) are located between the temperature measuring lead boxes (100). There are at least four temperature measuring lead boxes (100) and at least six inspection manholes (101). A plurality of sewage discharge holes (102) are also provided at the bottom of the stator base.

8. The stator frame of a top double-cooler generator according to claim 1, characterized in that: The cooler is arranged along the length direction of the stator frame, and the cooling medium in the stator frame is hydrogen.

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