Generator stator coil cooling system

Abstract

The utility model provides a generator stator coil cooling system. The generator stator coil cooling system comprises a first collecting pipe arranged at one end of a generator, and a plurality of first insulating water diversion pipes communicated with the first collecting pipe; the second collecting pipe is arranged at the other end of the generator; the second insulating water diversion pipes are communicated with the second collecting pipe; a stator coil is communicated between each first insulating water conduit and one second insulating water conduit; a water inlet is formed in the first collecting pipe, and a water outlet is formed in the second collecting pipe; the water inlet is communicated with one end of the insulating flange, and the other end of the insulating flange is communicated with the water inlet pipe which is communicated with the water pump. The outer surface of each stator coil is coated with an insulating layer, and the insulating layers are connected with a metal inner base of the generator in an abutting mode. The first collecting pipe, the first switch and the first grounding end are sequentially connected in series; the second collecting pipe, the second switch and the second grounding end are sequentially connected in series. According to the invention, the convenience of switching between the operation of the generator and the measurement of the main insulation resistance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of generators, and in particular to a generator stator coil cooling system. Background Art

[0002] When the generator is in operation, its stator coil will generate a lot of heat, which will affect the operation of the generator. Therefore, it is necessary to set a cooling system for the stator coil of the generator so as to cool the stator coil when the generator is running.

[0003] When the generator stops running, it is necessary to inspect the various components of the generator to improve the safety of the generator during operation. For example, the test includes measuring the resistance of the main insulation resistor, which is the insulation layer coated on the outer surface of the generator stator coil. The insulation layer can play a good insulation effect and ensure the normal operation of the generator. However, due to the long-term release of useless arcs, the insulation protection measures around the coil will be damaged to a certain extent. Over time, it may cause insulation layer failure, and then cause generator failure. Therefore, relevant staff should promptly inspect the use of the insulation layer to ensure the normal operation of the generator. When the resistance of the main insulation resistor is greater than the predetermined value, it is determined that the insulation of the main insulation resistor is good. If it is less than the predetermined value, it is considered that the insulation of the main insulation resistor is poor and relevant maintenance is required.

[0004] According to the requirements for measuring the main insulation resistance of generators with direct grounding of the manifold in the "Preventive Test Procedure for Electric Power Equipment DL / T 596", when measuring the main insulation resistance, the test should be carried out under the conditions that no water is flowing and the insulating water pipe is blown clean.

[0005] At present, the commonly used measures are: draining the water in the stator coil, the insulating water pipe and the manifold, and using compressed air to blow the water in the insulating water pipe dry. However, this method is time-consuming, and if the drying is not thorough, there is a risk of flashover burning the insulating water pipe. Obviously, the current generator cooling system affects the convenience and accuracy of the generator main insulation resistance measurement, and there is also a risk of burning the insulating water pipe. Utility Model Content

[0006] The present application provides a generator stator coil cooling system to solve the problems existing in the above-mentioned background technology.

[0007] The present application provides a generator stator coil cooling system, comprising:

[0008] A first manifold disposed at one end of the generator, connected to a plurality of first insulating water pipes on the first manifold;

[0009] A second manifold disposed at the other end of the generator, connected to a plurality of second insulating water pipes on the second manifold;

[0010] A stator coil is connected between each of the first insulating water pipes and one of the second insulating water pipes;

[0011] The first manifold is provided with a water inlet, and the second manifold is provided with a water outlet;

[0012] The water inlet is connected to one end of the insulating flange, the other end of the insulating flange is connected to the water inlet pipe, and the water inlet pipe is connected to the water pump;

[0013] The outer surface of each stator coil is coated with an insulating layer, and the insulating layer is in contact with the metal inner frame of the generator;

[0014] The first busbar, the first switch and the first ground terminal are connected in series in sequence;

[0015] The second bus, the second switch and the second ground terminal are connected in series in sequence.

[0016] Optionally, the first manifold and the second manifold are annular manifolds, a plurality of the first insulating water pipes are evenly arranged on the side wall of the first manifold, and a plurality of the second insulating water pipes are evenly arranged on the side wall of the second manifold.

[0017] Optionally, the first switch and the second switch are metal connecting piece switches, respectively denoted as a first metal connecting piece and a second metal connecting piece.

[0018] Optionally, the structure of the insulating flange includes a generator housing cover flange interface, a nylon flange, a first collector flange interface, a plexiglass sleeve and a water inlet pipe flange interface which are sequentially arranged from the first collector to the water inlet pipe; a first sealing gasket is arranged at the connection between the generator housing cover flange interface and the nylon flange, and a second sealing gasket is arranged at the connection between the nylon flange and the first collector flange interface; the first collector flange interface, the nylon flange and the generator housing cover flange interface are fixed by a plurality of first insulating sleeves, and the plexiglass sleeve and the water inlet pipe flange interface are fixed by a plurality of second insulating sleeves; the plexiglass sleeve and the water inlet pipe flange interface are located inside the water inlet pipe, the nylon flange and the first collector flange interface are located inside the first collector, and the generator housing cover flange interface is located outside the first collector.

[0019] Optionally, an insulating bracket is provided between the end of the outer base and the first collector, and between the end of the outer base and the second collector.

[0020] Optionally, the insulating support includes a first C-shaped insulating pressing block with an opening facing upward, a second C-shaped insulating pressing block with an opening facing downward, and insulating screws fixed at both ends of the first C-shaped insulating pressing block and the second C-shaped insulating pressing block.

[0021] Optionally, the cooling system further comprises a power cord matching the three-phase output terminal of the generator, one end of the power cord is provided with a connector matching each output terminal, and the other end of the power cord is provided with a power plug matching the external power supply.

[0022] The generator stator coil cooling system provided by the embodiment of the present application is provided with a first switch between the first collector and the first grounding terminal, and a second switch between the second collector and the second grounding terminal. When the generator is in operation, the collector needs to be grounded. At this time, the first switch and the second switch are closed, so that the first collector and the second collector are in a grounding state, so that the generator can operate normally. When the generator stops running, it is necessary to measure the resistance value of the main insulation resistance of the generator. At this time, the first switch and the second switch are disconnected, so that the first collector and the second collector are in a disconnected state, so as to increase the resistance value of the secondary insulation resistance, reduce the influence on the measurement of the main insulation resistance, and obtain an accurate resistance value of the main insulation resistance. With the prior art, when the generator is shut down and the resistance value of the main insulation resistance needs to be measured, it is necessary to drain all the water in the stator coil, the insulating water pipe, the first collector, the second collector and the water inlet pipe, and blow them dry with compressed air, which requires more manpower and needs to wait for each pipe to change from water to dry state, and the waiting time is also long. Therefore, compared with the prior art, the stator coil cooling system provided in the present application can conveniently switch between generator operation and main insulation resistance measurement through only one switch, which is simple and convenient to operate, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is an equivalent schematic diagram corresponding to the existing cooling system;

[0025] Figure 2 An equivalent schematic diagram corresponding to a cooling system provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure between a first manifold, a first insulating water diversion pipe and a stator coil provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure between a second manifold, a second insulating water diversion pipe and a stator coil provided in an embodiment of the present application;

[0028] Figure 5 An equivalent schematic diagram corresponding to another cooling system provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the structure of an insulating flange provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of a structure in which an insulating flange is connected to a water inlet pipe and a first manifold provided in an embodiment of the present application;

[0031] Figure 8 A schematic structural diagram of an insulating bracket provided in an embodiment of the present application.

[0032] In the figure: the first manifold 1; the first insulated water diversion pipe 2; the second manifold 3; the second insulated water diversion pipe 4; the stator coil 5; the water inlet 6; the insulating flange 7; the water inlet pipe 8; the water pump 9; the first switch 10; the first grounding terminal 11; the second switch 12; the second grounding terminal 13; the main insulation resistor 14; the third grounding terminal 15; the secondary insulation resistor 16; the sewage outlet 17; the power plug 18; the generator housing cover flange interface 19; the nylon flange 20; the first manifold flange interface 21; the organic glass sleeve 22; the water inlet pipe flange interface 23; the first sealing gasket 24; the second sealing gasket 25; the first insulating sleeve 26; the second insulating sleeve 27; the insulating screw 28; the first C-shaped insulating block 29; the second C-shaped insulating block 30; the end of the outer base 31; the water outlet 32. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also belong to the scope of protection of the present application. In addition, it should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] Before introducing the technical solution of this application, we first introduce the related technologies to facilitate a better understanding of the technical solution of this application. Figure 1 , Figure 1 It is an equivalent schematic diagram of an existing cooling system, which includes:

[0035] A first manifold 1 disposed at one end of the generator is connected to a plurality of first water pipes on the first manifold 1; a second manifold 3 disposed at the other end of the generator is connected to a plurality of second water pipes on the second manifold 3; a stator coil 5 is connected between each of the first water pipes and one of the second water pipes;

[0036] The outer surface of each stator coil 5 is coated with an insulating layer, and the insulating layer is connected to the third grounding terminal 15;

[0037] The first busbar 1 is connected to a first ground terminal 11 ; the second busbar 3 is connected to a second ground terminal 13 .

[0038] Among them, the insulating layer coated on the outer surface of the stator coil 5 is equivalent to the main insulation resistor 14, and the first water pipe and the material inside it, the second water pipe and the material inside it are each equivalent to a secondary insulation resistor 16. The output ends of the three-phase electricity A, B and C are used as the power input ends when measuring the main insulation resistor 14, so an external power supply is connected when measuring the main insulation resistor 14. The main insulation resistor 14 and the secondary insulation resistor 16 are in a parallel relationship, so when measuring the resistance value of the main insulation resistor 14, the resistance value of the secondary insulation resistor 16 needs to be larger. The larger the resistance value of the secondary insulation resistor 16, the more accurate the measurement result of the main insulation resistor 16. Therefore, when measuring the main insulation resistance 14, the prior art needs to drain the water in the cooling system and blow dry the first water pipe and the second water pipe to prevent the current from being conducted through the cooling water in the first water pipe and the second water pipe and reaching the first manifold and the second manifold when the resistance of the water in the first water pipe and the second water pipe is small. Therefore, if the water in the first water pipe and the second water pipe is not drained or blown dry, the first water pipe and the second water pipe may be burned, and the resistance of the secondary insulation resistor 16 may be reduced, affecting the measurement accuracy of the resistance of the main insulation resistor 14.

[0039] Figure 2 A generator stator coil cooling system is shown according to an embodiment of the present application. Figure 2 As shown, combined with Figure 3 and Figure 4 The system comprises:

[0040] A first manifold 1 disposed at one end of the generator, connected to a plurality of first insulating water pipes 2 on the first manifold 1;

[0041] A second manifold 3 is arranged at the other end of the generator, and is connected to a plurality of second insulating water pipes 4 on the second manifold 3;

[0042] A stator coil 5 is connected between each of the first insulating water pipes 2 and one of the second insulating water pipes 4;

[0043] The first manifold 1 is provided with a water inlet 6, and the second manifold 3 is provided with a water outlet 32;

[0044] The water inlet 6 is connected to one end of the insulating flange 7, the other end of the insulating flange 7 is connected to the water inlet pipe 8, and the water inlet pipe 8 is connected to the water pump 9;

[0045] The outer surface of each stator coil 5 is coated with an insulating layer, and the insulating layer is in contact with the metal inner frame of the generator;

[0046] The first busbar 1, the first switch 10, and the first ground terminal 11 are connected in series in sequence;

[0047] The second busbar 3 , the second switch 12 , and the second ground terminal 13 are connected in series in sequence.

[0048] because Figure 2 and Figure 1 The structure of is similar, so for ease of understanding, Figure 2 and Figure 1 The same figure numbers are used for some structures.

[0049] in, Figure 3 Only the structural schematic diagram of the first collector 1, the first insulating water pipe 2 and the stator coil 5 is shown. Figure 4 The schematic diagram of the structure of the second collector 3, the second insulating water pipe 4 and the stator coil 5 is shown.

[0050] The cooling water flowing into the first manifold 1, the second manifold 3, the first insulating water pipe 2, the second insulating water pipe 4 and the stator coil 5 is mainly used to take away the heat in the stator coil 5 and cool the stator coil 5. In addition, it should be noted that the cooling water is purified and has extremely low conductivity, so as to improve the insulation performance of the generator, prevent the generator from breakdown, and thus improve the safety of the generator operation.

[0051] The first collector 1 and the second collector 3 are made of metal, for example, iron. The first collector 1 and the second collector 3 are made of metal so that when the generator is in operation, the current in the cooling water can be conducted to the ground terminal through the first collector 1 and the second collector 3 to ensure the safety of the generator operation.

[0052] The stator coil 5 is a hollow metal coil, and cooling water can directly flow into the stator coil 5 to cool the stator coil 5 and improve the cooling efficiency.

[0053] In addition, the insulating layer can be equivalent to a resistor, which is recorded as the main insulating resistor 14. Although the insulating layer is used for insulation, it cannot be guaranteed that its resistance value is always within the expected resistance range, so it is connected to the metal inner base as the grounding terminal of the main insulating resistor 14, which is recorded as the third grounding terminal 15.

[0054] Since the water pressure of the water inlet pipe 8 is generally relatively high, the material of the water inlet pipe 8 is generally metal.

[0055] The insulating flange 7 is used to insulate the first manifold 1 from the water inlet pipe 8 so as to prevent current from being conducted along this path when the main insulation resistance 14 needs to be measured.

[0056] The material of the insulating layer coated on the outer surface of the stator coil 5 may be glass fiber.

[0057] The first switch 10 is used to connect or disconnect the first busbar 1 and the first ground terminal 11 .

[0058] The second switch 12 is used to connect or disconnect the second busbar 3 and the second ground terminal 13 .

[0059] In addition, it should be noted that Figure 2 Each phase stator coil 5 does not mean that it has only one coil. Figure 2 It is only for schematic illustration. There are actually multiple coils, so the first insulating water pipe 2 and the second insulating water pipe 4 are not just three, which are also only for schematic illustration.

[0060] The working principle of the generator stator coil 5 cooling system provided in this application is as follows:

[0061] When the generator is running, the first switch 10 and the second switch 12 are closed, so that the first manifold 1 is connected to the first grounding terminal 11, and the second manifold 3 is connected to the second grounding terminal 13, so that the current conducted through the water medium flows into the first grounding terminal 11 through the first manifold 1, and flows into the second grounding terminal 13 through the second manifold 3, thereby improving the safety of the generator operation;

[0062] When the generator stops running and the resistance value of the main insulation resistor 14 needs to be detected, the first switch 10 and the second switch 12 are disconnected;

[0063] Then connect the A, B and C three-phase power output terminals of the generator to an external power supply to serve as the power input terminal when measuring the main insulation resistance 14;

[0064] The current input from the three terminals A, B and C is transmitted to the stator coil 5 of the generator, and then transmitted from the stator coil 5 to the main insulation resistor 14, and then transmitted from the main insulation resistor 14 to the inner machine frame, wherein the inner machine frame is made of metal and can be regarded as a ground terminal, which is recorded as the third ground terminal 15;

[0065] Measure the main insulation resistance 14 using a special meter for generator stator insulation testing;

[0066] When the resistance value is greater than the predetermined value, it is determined that the insulation performance of the main insulation resistor 14 of the generator stator is good; when the resistance value is less than the predetermined value, it is determined that the insulation performance of the main insulation resistor 14 of the generator stator is not up to standard;

[0067] The current input from the three terminals A, B and C is also insulated by the insulating water pipe, which prevents the current from flowing to the manifold; in addition, the current that may be conducted through the cooling water is prevented from flowing to the first grounding terminal 11 and the second grounding terminal 13 by disconnecting the first switch 10 and the second switch 12, thereby preventing the current from flowing in the first insulating water pipe 2 and the first manifold 1, and also preventing the current from flowing in the second insulating water pipe 4 and the second manifold 3, thereby increasing the resistance value of the secondary insulation resistor 16 and improving the detection accuracy of the main insulation resistor 14;

[0068] In addition, the first manifold 1 is also insulated by the insulating flange 7 to prevent the current conducted by the cooling water from flowing to the water inlet pipe 8 and the water pump 9, thereby further increasing the resistance of the secondary insulation resistor 16 and improving the detection accuracy of the main insulation resistor 14.

[0069] The generator stator cooling system provided in the embodiment of the present application is provided with a first switch 10 between the first busbar 1 and the first grounding terminal 11, and a second switch 12 between the second busbar 3 and the second grounding terminal 13. When the generator is in operation, the busbar needs to be grounded. At this time, the first switch 10 and the second switch 12 are closed, so that the first busbar 1 and the second busbar 3 are in a grounded state, thereby allowing the generator to operate normally. When the generator is suspended, it is necessary to measure the resistance value of the main insulation resistor 14 of the generator. At this time, the first switch 10 and the second switch 12 are disconnected, so that the first busbar 1 and the second busbar 3 are in a disconnected state, so as to increase the resistance value of the secondary insulation resistor 16, reduce the influence on the measurement of the main insulation resistor 14, and obtain an accurate resistance value of the main insulation resistor 14. With the prior art, when the generator is shut down and the resistance value of the main insulation resistor 14 needs to be measured, the water in the stator coil 5, the insulating water pipe, the first manifold 1, the second manifold 3 and the water inlet pipe 8 needs to be completely drained and blown dry with compressed air, which requires more manpower and requires waiting for each pipe to change from a water-filled state to a dry state, and the waiting time is also long. Therefore, compared with the prior art, the stator coil 5 cooling system provided in the present application can conveniently switch between the generator operation and the measurement of the main insulation resistor 14 with only one switch, which is simple and convenient to operate, saving time and effort.

[0070] Alternatively, see Figure 3 The first manifold 1 is provided with a sewage outlet 17.

[0071] The water outlet 32 ​​on the second manifold 3 can be used as a sewage outlet.

[0072] Alternatively, see Figure 3 The first manifold 1 and the second manifold 3 are annular manifolds, a plurality of the first insulating water pipes 2 are evenly arranged on the side wall of the first manifold 1 , and a plurality of the second insulating water pipes 4 are evenly arranged on the side wall of the second manifold 3 .

[0073] Since the stator core is a columnar structure, the collector is configured as an annular structure in order to match the columnar stator core, so that the stator coil 5 can be evenly wound on the stator core.

[0074] Optionally, the first switch 10 and the second switch 12 are metal connecting piece switches, which are respectively denoted as a first metal connecting piece and a second metal connecting piece.

[0075] When the generator is running, the first metal connecting piece is connected between the first busbar 1 and the first grounding terminal 11, and the second metal connecting piece is connected between the second busbar 3 and the second grounding terminal 13. When the generator is paused and the resistance value of the main insulation resistor 14 needs to be measured, the first metal connecting piece and the second metal connecting piece are removed to disconnect the first busbar 1 from the first grounding terminal 11, and the second busbar 3 from the second grounding terminal 13.

[0076] Furthermore, the first metal connecting piece is connected between the first busbar 1 and the first grounding terminal 11 by means of a clamping connection, and the second metal connecting piece is connected between the second busbar 3 and the second grounding terminal 13 by means of a clamping connection.

[0077] When the first metal connecting piece and the second metal connecting piece need to be removed, they can be removed by clamping them with pliers.

[0078] The metal link switch has a simple structure and a small size. It is not only easy to operate but also can reduce the size of the generator.

[0079] Of course, the switch may also be other forms of switches, such as a touch switch.

[0080] Optionally, the first grounding terminal 11 is a metal shell of the generator.

[0081] By using the metal shell of the generator as the first grounding terminal 11, there is no need to specially set up the first grounding terminal 11, which can not only reduce the cost of the generator, but also reduce the size of the generator.

[0082] Alternatively, see Figure 6 and Figure 7 The structure of the insulating flange 7 includes a generator housing cover flange interface 19, a nylon flange 20, a first collector flange interface 21, a plexiglass sleeve 22 and a water inlet pipe flange interface 23 which are sequentially arranged from the first collector 1 to the water inlet pipe 8; a first sealing gasket 24 is arranged at the connection between the generator housing cover flange interface 19 and the nylon flange 20, and a second sealing gasket 25 is arranged at the connection between the nylon flange 20 and the first collector flange interface 21; the first collector flange interface 21, the nylon flange 20 and the generator housing cover flange interface 19 are fixed by a plurality of first insulating sleeves 26, and the plexiglass sleeve 22 and the water inlet pipe flange interface 23 are fixed by a plurality of second insulating sleeves 27; the plexiglass sleeve 22 and the water inlet pipe flange interface 23 are located inside the water inlet pipe 8, the nylon flange 20 and the first collector flange interface 21 are located inside the first collector 1, and the generator housing cover flange interface 19 is located outside the first collector 1.

[0083] The organic glass sleeve 22 and the water inlet pipe flange interface 23 are located inside the water inlet pipe 8 and are used to sleeve the water inlet pipe 8 to fix the position of the water inlet pipe 8 .

[0084] Furthermore, an external thread is provided on the outer surface of the plexiglass sleeve 22 and the water inlet pipe flange interface 23, and an internal thread is provided inside the water inlet pipe 8. The water inlet pipe 8 is sleeved on the outside of the plexiglass sleeve 22 and the water inlet pipe flange interface 23 by means of threaded connection to improve the firmness of the fixation between them.

[0085] The nylon flange 20 and the first manifold flange interface 21 are located inside the first manifold 1 and are used to sleeve the first manifold 1 to fix the position of the first manifold 1 .

[0086] Furthermore, external threads are provided on the outer surfaces of the nylon flange 20 and the first manifold flange interface 21, and internal threads are provided inside the first manifold 1, and the water inlet pipe 8 is sleeved on the outside of the nylon flange 20 and the first manifold flange interface 21 by means of threaded connection to improve the firmness of the fixation between them.

[0087] In addition, by fixing the generator housing flange interface 19 to the outside of the first manifold 1, the generator housing flange interface 19, the nylon flange 20 inside the first manifold 1 and the first manifold flange interface 21 tighten the first manifold 1 inside and outside to jointly fix the first manifold 1 and improve the firmness of the first manifold 1.

[0088] The first sealing gasket 24 improves the sealing performance of the connection between the generator housing flange interface 19 and the nylon flange 20, reduces the possibility of water leakage, and improves the insulation performance between the first manifold 1 and the water inlet pipe 8.

[0089] The second sealing gasket 25 improves the sealing performance of the connection between the first manifold flange interface 21 and the nylon flange 20 , reduces the possibility of water leakage, and improves the insulation performance between the first manifold 1 and the water inlet pipe 8 .

[0090] The first manifold flange interface 21 and the nylon flange 20 are fixed by a plurality of first insulating sleeves 26 , so as to improve the insulation between the first manifold 1 and the water inlet pipe 8 and improve the accuracy of the resistance value measurement of the main insulation resistor 14 .

[0091] The organic glass sleeve 22 and the water inlet pipe flange interface 23 are fixed by a plurality of second insulating sleeves 27, so as to improve the insulation between the first manifold 1 and the water inlet pipe 8 and improve the accuracy of the resistance value measurement of the main insulation resistor 14.

[0092] Furthermore, screws are installed inside the first insulating sleeve 26 and the second insulating sleeve 27 to improve the firmness of the fixation.

[0093] Optionally, an insulating bracket is provided between the outer base end 31 and the first collector 1 , and between the outer base end 31 and the second collector 3 .

[0094] Furthermore, the bracket located between the external base and the first collector 1 is called a first insulating bracket, and the bracket located between the external base and the second collector 3 is called a second insulating bracket.

[0095] The insulating bracket can be a bracket made of bakelite, which is used to support the manifold, separate the manifold from the external machine base, improve the insulation of the manifold, reduce the influence of the manifold on the measurement of the main insulation resistance 14, and thus improve the measurement accuracy of the main insulation resistance 14.

[0096] Alternatively, see Figure 8 The insulating support includes a first C-shaped insulating pressing block 29 with an opening facing downward, a second C-shaped insulating pressing block 30 with an opening facing upward, and insulating screws 28 fixed at both ends of the first C-shaped insulating pressing block 29 and the second C-shaped insulating pressing block.

[0097] The first C-shaped insulating block 29, the second C-shaped insulating block 30 and the two insulating screws 28 form a through hole, and the first busbar 1 or the second busbar 3 passes through the through hole. By screwing the two insulating screws 28, the first C-shaped insulating block 29 and the second C-shaped insulating block 30 are brought closer to each other, thereby playing the role of fixing, supporting and insulating the first busbar 1 and the second busbar 3.

[0098] The insulating screw 28 may be formed by an insulating tube in a metal screw jacket.

[0099] Optionally, the water inlet pipe 8 is a plastic insulating pipe.

[0100] Setting the water inlet pipe 8 as a plastic insulating pipe can improve the insulation between the manifold and the water pump 9, reduce the influence of the manifold on the measurement of the main insulation resistance 14, and thus improve the measurement accuracy of the main insulation resistance 14.

[0101] It should be noted that the water pressure in the water inlet pipe 8 is relatively high, and an insulating pipe made of a pressure-resistant plastic material needs to be used first.

[0102] Alternatively, see Figure 5 The cooling system also includes a power cord matching the three-phase output terminal of the generator, one end of the power cord is provided with a connector matching each output terminal, and the other end of the power cord is provided with a power plug 18 matching the external power supply.

[0103] When the main insulation resistor 14 needs to be measured, the main insulation resistor 14 needs to be connected to the power supply. Because when the main insulation resistor 14 is measured, the generator is in a suspended state, and the three-phase output terminals of the generator have no current output and are in a suspended state. Therefore, the three output terminals of the generator can be used as the input terminals of the external power supply, so as to connect the main insulation resistor 14 to the power supply, and then directly measure whether the main insulation resistor 14 is good through the generator stator insulation detection special meter, and accurately evaluate the insulation condition of the main insulation resistor 14.

[0104] When in use, the connector of the power cord is connected to the output end of the generator, and the power plug 18 is plugged into an external power source, so that the main insulation resistor 14 can be powered, and the resistance value of the main insulation resistor 14 can be measured.

[0105] By using the output end of the generator as the input end of the external power supply, there is no need to set up an additional input end of the external power supply, which not only reduces the cost but also reduces the size of the generator.

[0106] In addition, through the power cord provided with the connector and the power plug 18, the three-phase output terminal can be conveniently connected to the external power supply, thereby improving the convenience of measuring the main insulation resistance 14.

[0107] In addition, it should be noted that the scope of this application includes feasible technical solutions formed by specific combinations of the above-mentioned technical features, and should also cover other feasible technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept.

[0108] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0109] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0110] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0111] Finally, it should be noted that all contents not described in the technical solution of this application can be implemented using existing technologies. In addition, the above embodiments are only used to illustrate the technical solution of this application, rather than to limit it; although the application is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A generator stator coil cooling system, It is characterized in that include: A first manifold disposed at one end of the generator, connected to a plurality of first insulating water pipes on the first manifold; A second manifold disposed at the other end of the generator, connected to a plurality of second insulating water pipes on the second manifold; A stator coil is connected between each of the first insulating water pipes and one of the second insulating water pipes; The first manifold is provided with a water inlet, and the second manifold is provided with a water outlet; The water inlet is connected to one end of the insulating flange, the other end of the insulating flange is connected to the water inlet pipe, and the water inlet pipe is connected to the water pump; The outer surface of each stator coil is coated with an insulating layer, and the insulating layer is in contact with the metal inner frame of the generator; The first busbar, the first switch and the first ground terminal are connected in series in sequence; The second bus, the second switch and the second ground terminal are connected in series in sequence.

2. The generator stator coil cooling system according to claim 1, It is characterized in that The first manifold and the second manifold are annular manifolds, a plurality of the first insulating water pipes are evenly arranged on the side wall of the first manifold, and a plurality of the second insulating water pipes are evenly arranged on the side wall of the second manifold.

3. The generator stator coil cooling system according to claim 2, It is characterized in that The first switch and the second switch are metal connecting piece switches, which are respectively denoted as a first metal connecting piece and a second metal connecting piece.

4. The generator stator coil cooling system according to claim 1, It is characterized in that The structure of the insulating flange includes a generator housing cover flange interface, a nylon flange, a first collector flange interface, a plexiglass sleeve and a water inlet pipe flange interface which are sequentially arranged from the first collector to the water inlet pipe; a first sealing gasket is arranged at the connection between the generator housing cover flange interface and the nylon flange, and a second sealing gasket is arranged at the connection between the nylon flange and the first collector flange interface; the first collector flange interface, the nylon flange and the generator housing cover flange interface are fixed by a plurality of first insulating sleeves, and the plexiglass sleeve and the water inlet pipe flange interface are fixed by a plurality of second insulating sleeves; the plexiglass sleeve and the water inlet pipe flange interface are located inside the water inlet pipe, the nylon flange and the first collector flange interface are located inside the first collector, and the generator housing cover flange interface is located outside the first collector.

5. The generator stator coil cooling system according to claim 1, It is characterized in that An insulating bracket is arranged between the end of the outer base and the first collector, and between the end of the outer base and the second collector.

6. The generator stator coil cooling system according to claim 5, It is characterized in that The insulating support comprises a first C-shaped insulating pressing block with an opening facing upward, a second C-shaped insulating pressing block with an opening facing downward, and insulating screws fixed at both ends of the first C-shaped insulating pressing block and the second C-shaped insulating pressing block.

7. The generator stator coil cooling system according to any one of claims 1 to 6, It is characterized in that The cooling system also includes a power cord matching the three-phase output terminal of the generator, one end of the power cord is provided with a connector matching each output terminal, and the other end of the power cord is provided with a power plug matching the external power supply.

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