Hydrogen-cooled generator lead outlet cooling air path structure and cooling method

Abstract

The invention relates to the technical field of generators, and particularly discloses a hydrogen-cooled generator lead outlet cooling air path structure and a cooling method, the hydrogen-cooled generator lead outlet cooling air path structure comprises a copper bar outer cooling assembly, a plurality of groups of copper pipe inner cooling assemblies used in cooperation with the copper bar outer cooling assembly, and an outlet cover inner wall air duct connected with the copper pipe inner cooling assemblies; the copper pipe inner cooling assembly comprises a tubular annular lead provided with an air inlet A and an air outlet A, and a wire outlet assembly connected with one end of the tubular annular lead. The wire outlet assembly comprises a transition lead wire assembly connected with the tubular annular lead wire and provided with an air outlet B, a wire outlet sleeve connected with the end, away from the tubular annular lead wire, of the transition lead wire assembly, and an air inlet assembly arranged on the wire outlet sleeve and communicated with the wire outlet sleeve. The wind path can be effectively shortened, the wind temperature of the air outlet is reduced, the copper consumption is reduced, the problem that the temperature of the annular lead and the outgoing line of the large-current all-hydrogen-cooled generator is too high can be solved, and the running reliability of the generator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and more specifically, to a cooling air duct structure and a cooling method for the lead-out line of a hydrogen-cooled generator. Background Art

[0002] In the prior art, there are the following two ventilation and cooling air duct structures:

[0003] One is the structure form of a fully copper busbar ring-shaped lead and outlet line, which adopts an externally cooled ventilation and cooling air duct, that is, the entire lead-out line exchanges heat with the cooling medium hydrogen through the insulating surface, so as to achieve the goal of cooling the lead-out line. When designing the ring-shaped lead and outlet line, it is necessary to optimize the cross-section of the copper busbar, reduce the current density of the copper busbar, and comprehensively consider the influence of various factors such as the skin effect of the copper busbar, the proximity effect of the lead ring, the thickness of the insulation on the surface of the copper busbar, the heat dissipation area of the insulating surface, and the ventilation air volume of the lead-out line. The ring-shaped lead is supported by an insulating bracket, and the space between the leads is wrapped with a pad and stuffed with impregnated felt, and fixed with a binding rope to ensure that the ring-shaped lead and the pad do not loosen or displace, so that the entire end becomes a firm whole.

[0004] The other is the structure form of a copper busbar + copper tube structure ring-shaped lead and outlet line, which is mainly internally cooled and supplemented by external cooling, and the outlet sleeve is internally cooled. Finally, the copper tube leads and the outlet line are combined to form a single-parallel cooling air duct structure: This structure is suitable for large-capacity models. The arrangement of the copper busbar and the copper tube can reduce the distance between the copper busbar and the copper tube, reduce the influence of the proximity effect and the skin effect, and reduce the loss. Among them, the phase connection line adopts a copper busbar structure, and the rest of the tubular ring-shaped leads and the transition leads adopt a copper tube structure, which is formed by bending a high-conductivity oxygen-free copper tube. The surfaces of the copper busbar and the copper tube are both wrapped with insulation about 2-5 mm thick, and the outlet part is an epoxy composite insulation sleeve.

[0005] However, with the further breakthrough of the capacity of the fully hydrogen-cooled unit, on the one hand, the current flowing through the tubular ring-shaped lead and the stator outlet line further increases, the influence of the proximity effect and the skin effect is further prominent, and the loss of the tubular ring-shaped lead and the stator outlet line rises sharply. On the other hand, considering the increase of the pitch circle of the ring-shaped lead, the length of the copper tube ring-shaped lead increases significantly, and the problem of the overlong cooling air duct of the ring-shaped lead becomes increasingly prominent. The temperature of the copper tube ring-shaped lead is too high, and even the local temperature of the lead ring at the air outlet exceeds the allowable temperature of the F insulation class. Therefore, a new ventilation and cooling air duct is needed to solve the problem of excessive temperature rise of the lead-out line. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a cooling air duct structure and a cooling method for the lead-out line of a hydrogen-cooled generator;

[0007] The solution adopted by the present invention to solve the technical problem is:

[0008] A cooling air duct structure for the lead-out line of a hydrogen-cooled generator, comprising an external copper bar cooling component, a plurality of groups of internal copper tube cooling components used in cooperation with the external copper bar cooling component, and an inner wall air duct of the outlet cover connected to the internal copper tube cooling component;

[0009] The internal copper tube cooling component includes a tubular annular lead wire provided with an air inlet A and an air outlet A, and an outlet component connected to one end of the tubular annular lead wire;

[0010] The outlet component includes a transition lead wire component connected to the tubular annular lead wire and provided with an air outlet B, an outlet sleeve connected to the end of the transition lead wire component far from the tubular annular lead wire, and an air inlet component provided on the outlet sleeve and communicated with the outlet sleeve; the outlet B of the transition lead wire component is communicated with the inner wall air duct of the outlet cover.

[0011] In some possible implementation manners, the transition lead wire component includes an upper transition lead wire connected to the tubular annular lead wire, and a lower transition lead wire connected to the end of the upper transition lead wire far from the tubular annular lead wire.

[0012] In some possible implementation manners, the transition lead wire component further includes a support sleeve disposed between the upper transition lead wire and the lower transition lead wire; the air outlet B is disposed on the support sleeve and communicated with the inner wall air duct of the outlet cover.

[0013] In some possible implementation manners, a hard connecting piece is disposed between the upper transition lead wire and the tubular annular lead wire, and an air inlet B is disposed on the hard connecting piece.

[0014] In some possible implementation manners, the air inlet component includes an insulating air inlet pipe horizontally disposed and in a tee shape; the insulating air inlet pipe includes an air inlet pipe with a horizontally disposed axis, and an insulating ventilation pipe connected to one end of the air inlet pipe and forming a T-shaped structure; the other end of the insulating ventilation pipe is connected to the outlet sleeve.

[0015] In some possible implementation manners, the tubular annular lead wire includes a main line in an arc shape and connected to the outlet component at one end, and an inlet line connected to the end of the main line far from the outlet component; the air inlet A is disposed on the inlet line; the air outlet A is disposed on the main line.

[0016] In some possible implementation manners, a lead wire insulating air duct is disposed on the air outlet A.

[0017] According to the cooling method of the cooling air duct structure for the lead-out line of the hydrogen-cooled generator described above, external cooling is performed by using the external copper bar cooling component, internal cooling is performed by the cooling air duct formed by the internal copper tube cooling component, and cooling is performed by combining external cooling and internal cooling; the cooling air duct includes a lead wire cooling parallel air duct and an outlet cooling parallel air duct.

[0018] In some possible embodiments, the internal cooling by using the lead cooling parallel air ducts specifically means that:

[0019] The cooling hydrogen enters the tubular annular lead from the air inlet A, flows through the air duct formed by the tubular annular lead for heat exchange, and then reaches the air outlet A;

[0020] The cooling hydrogen enters the tubular annular lead from the air inlet B, flows through the air duct of the tubular annular lead for heat exchange, and then reaches the air outlet A;

[0021] The hot hydrogen after heat exchange converges at the air outlet A and is discharged to the low-pressure area to achieve the cooling of the annular lead.

[0022] In some possible embodiments, the internal cooling by using the outgoing line cooling parallel air ducts specifically means that:

[0023] The cooling hydrogen enters the upper transition lead from the air inlet B, and enters the support sleeve after passing through the upper transition lead;

[0024] The cooling hydrogen enters the air inlet pipe, flows through the insulating ventilation pipe with a hollow structure, and sequentially passes through the outgoing line sleeve, the lower transition lead, and the support sleeve;

[0025] The hot hydrogen after heat exchange converges in the support sleeve, enters the air duct through the air outlet B, and then enters the low-pressure area.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The present invention can effectively shorten the air duct path, reduce the air temperature at the air outlet, reduce the copper consumption, solve the problem of too high temperature of the annular lead and the outgoing line of the large-current fully hydrogen-cooled generator, and improve the reliability of the generator operation. Description of the Drawings

[0028] Figure 1 is a structural schematic diagram of the present invention;

[0029] Figure 2 is a schematic connection diagram of the tubular annular lead and the copper tube internal cooling component in the present invention;

[0030] Figure 3 is a schematic connection diagram of the air duct on the inner wall of the outgoing line cover and the copper tube internal cooling component in the present invention;

[0031] Wherein: 10, copper bar external cooling component; 20, copper tube internal cooling component; 1, tubular annular lead; 11, main line; 111, air outlet A; 12, incoming line; 121, air inlet A; 13, lead insulating air duct; 2, outgoing line component; 21, transition lead component; 211, upper transition lead; 212, lower transition lead; 213, support sleeve; 2131, air outlet B; 214, hard connection piece; 2141, air inlet B; 22, outgoing line sleeve; 23, air inlet component; 231, insulating ventilation duct; 232, air inlet duct. Detailed implementation manners

[0032] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limit, but indicate that there is at least one. In the implementation of this application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of this application, unless otherwise stated, the meaning of "a plurality" refers to two or more. For example, a plurality of positioning posts refers to two or more positioning posts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] The present invention will be described in detail below.

[0034] On the one hand:

[0035] As Figures 1 - 3 shown:

[0036] A lead and outgoing line cooling air duct structure for a hydrogen-cooled generator includes a copper bar external cooling component 10 for realizing external cooling heat exchange, several groups of copper tube internal cooling components 20 used in cooperation with the copper bar external cooling component 10 and realizing internal cooling heat exchange, and an inner wall air duct 30 of the outgoing line cover connected to the copper tube internal cooling component 20; the inner wall air duct 30 of the outgoing line cover is communicated with the low-pressure area;

[0037] The copper bar external cooling component 10 is the same as the copper bar in the structure of the copper bar + copper tube structure annular lead and outgoing line in the prior art, and will not be elaborated here;

[0038] The copper tube internal cooling component 20 includes a tubular annular lead 1 provided with an air inlet A121 and an air outlet A111, and an outgoing line component 2 connected to one end of the tubular annular lead 1;

[0039] The outgoing line component 2 includes a transition lead component 21 connected to the tubular annular lead 1 and provided with an air inlet B2141 and an air outlet B2131, an outgoing line sleeve 22 connected to the end of the transition lead component 21 away from the tubular annular lead 1, and an air inlet component 23 provided on the outgoing line sleeve 22 and communicating with the outgoing line sleeve 22; the outlet B of the transition lead component 21 communicates with the inner wall air duct 30 of the outgoing line cover.

[0040] When the tubular annular lead 1 conducts cooling heat exchange, part of the cooling hydrogen is transported into the tubular annular lead 1 through the air inlet A121. At the same time, another part of the cooling hydrogen enters the tubular annular lead 1 through the air inlet B2141 of the transition lead component 21 to conduct heat exchange on the tubular annular lead 1. The heated hydrogen after heat exchange reaches the air outlet A111 and enters the low-pressure area through the lead insulating air duct 13;

[0041] When the outgoing line component 2 conducts cooling heat exchange, part of the cooling hydrogen enters the transition lead component 21 from the air inlet B2141. At the same time, another part of the cooling hydrogen enters the outgoing line sleeve 22 through the air inlet component 23, and then enters the transition lead component 21 to conduct heat exchange on the transition lead component 21. The heated hydrogen after heat exchange is discharged to the inner wall air duct 30 of the outgoing line cover through the air outlet B2131, and then enters the low-pressure area;

[0042] In some possible implementation manners, the transition lead component 21 includes an upper transition lead 211 connected to the tubular annular lead 1, a lower transition lead 212 connected to the end of the upper transition lead 211 away from the tubular annular lead 1, and a support sleeve 213 arranged between the upper transition lead 211 and the lower transition lead 212; the air outlet B2131 is arranged on the support sleeve 213 and communicates with the inner wall air duct 30 of the outgoing line cover.

[0043] Further, the lower transition lead 212 and the upper transition lead 211 are soft-connected; both ends of the support sleeve 213 communicate with the lower transition lead 212 and the inner wall air duct 30 of the outgoing line cover respectively;

[0044] The cooling hydrogen enters the upper transition lead 211 from one end of the upper transition lead 211 close to the tubular annular lead 1. After heat exchange with the upper transition lead 211, it is discharged to the inner wall air duct 30 of the outgoing line cover through the air outlet B2131, and is transported to the low-pressure area through the inner wall air duct 30 of the outgoing line cover, realizing the cooling heat exchange of the upper transition lead 211.

[0045] In some possible embodiments, in order to effectively connect the tubular annular lead 1 to the upper transition lead 211 and enable cooling heat exchange of the upper transition lead 211, a hard connection member 214 is provided between the upper transition lead 211 and the tubular annular lead 1, and an air inlet B2141 is provided on the hard connection member 214.

[0046] In some possible embodiments, the air inlet assembly 23 includes an insulating air inlet pipe arranged horizontally and in a tee shape. The insulating air inlet pipe includes an air inlet pipe 232 with a horizontally arranged axis, and an insulating ventilation pipe 231 connected to one end of the air inlet pipe 232 and forming a T-shaped structure. The other end of the insulating ventilation pipe 231 is connected to the outgoing line sleeve 22. This structure can effectively prevent the internal oil of the generator from entering the insulating air inlet pipe 232 and prevent the outgoing line sleeve 22 from overheating.

[0047] Both ends of the air inlet pipe 232 along its axial direction are air inlets C. Cooling hydrogen is introduced into the insulating ventilation pipe 231 through the air inlets C, enters the outgoing line sleeve 22, and then enters the lower transition lead 212 to achieve cooling heat exchange of the outgoing line sleeve 22 and the lower transition lead 212. The heated hydrogen after heat exchange is discharged to the inner wall air duct 30 of the outgoing line cover through the air outlet B2131 and is transported to the low-pressure area through the inner wall air duct 30 of the outgoing line cover.

[0048] In some possible embodiments, the tubular annular lead 1 includes a main line 11 in an arc shape and connected to the outgoing line assembly 2 at one end, and an incoming line 12 connected to the end of the main line 11 away from the outgoing line assembly 2. The air inlet A121 is provided on the incoming line 12, and the air outlet A111 is provided on the main line 11.

[0049] In some possible embodiments, a lead insulating air duct 13 is provided on the air outlet A111. By providing the lead insulating air duct 13 communicating with the low-pressure area on the air outlet A111, the heated hydrogen after heat exchange with the tubular annular lead 1 is transported to the low-pressure area.

[0050] Furthermore, the tubular annular lead 1 is made of copper pipe.

[0051] Through the above settings, the present invention can effectively shorten the air path, reduce the air temperature at the air outlet, reduce the copper consumption, solve the problem of excessive temperature of the annular lead and outgoing line of the large-current fully hydrogen-cooled generator, and improve the reliability of the generator operation.

[0052] On the other hand:

[0053] According to the cooling method of the lead-out cooling air duct structure of a hydrogen-cooled generator described above, the external cooling is carried out by the copper busbar external cooling component 10, and the internal cooling is carried out by the cooling air duct formed by the copper tube internal cooling component 20. Cooling is carried out by combining external cooling and internal cooling; the cooling air duct includes a lead cooling parallel air duct and an outlet cooling parallel air duct.

[0054] In some possible embodiments, the specific meaning of using the lead cooling parallel air duct for internal cooling is:

[0055] The cooling hydrogen enters the tubular annular lead 1 from the air inlet A121, flows through the air duct formed by the tubular annular lead 1 for heat exchange, and then arrives at the air outlet A111;

[0056] The cooling hydrogen enters the tubular annular lead 1 from the air inlet B2141, flows through the air duct of the tubular annular lead 1 for heat exchange, and then arrives at the air outlet A111;

[0057] The hot hydrogen after heat exchange converges at the air outlet A111 and is discharged to the low-pressure area through the lead insulation air duct 13 to realize the cooling of the annular lead.

[0058] In some possible embodiments, the specific meaning of using the outlet cooling parallel air duct for internal cooling is:

[0059] The cooling hydrogen enters the upper transition lead 211 from the air inlet B2141, and after passing through the upper transition lead 211, it enters the support sleeve 213 to realize heat exchange of the upper transition lead 211;

[0060] The cooling hydrogen enters the air inlet pipe 232, flows through the insulating air inlet pipe 231 with a hollow structure, and then successively passes through the outlet sleeve 22, the lower transition lead 212, and the support sleeve 213 to realize heat exchange of the line sleeve 22 and the lower transition lead 212;

[0061] The hot hydrogen after heat exchange converges in the support sleeve 213, enters the air duct on the inner wall of the outlet cover 30 through the air outlet B2131, and then enters the low-pressure area.

[0062] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A cooling air duct structure for lead wires of a hydrogen-cooled generator, characterized in that: It includes a copper row external cooling component, a plurality of copper tube internal cooling components used in conjunction with the copper row external cooling component, and an outlet cover inner wall air duct connected to the copper tube internal cooling component; The copper tube inner cooling assembly comprises a tubular annular lead provided with an air inlet A and an air outlet A, and an outlet assembly connected to one end of the tubular annular lead; The outlet assembly includes a transition lead assembly connected to the tubular ring lead and provided with an air outlet B, an outlet sleeve connected to one end of the transition lead assembly away from the tubular ring lead, and an air inlet assembly arranged on the outlet sleeve and connected to the outlet sleeve.

2. A hydrogen-cooled generator lead wire cooling air duct structure according to claim 1, characterized in that: The transition lead assembly comprises an upper transition lead connected to the tubular annular lead and a lower transition lead connected to one end of the upper transition lead away from the tubular annular lead.

3. A hydrogen-cooled generator lead-out cooling air duct structure according to claim 2, characterized in that: The transition lead assembly also includes a support sleeve arranged between the upper transition lead and the lower transition lead; the air outlet B is arranged on the support sleeve and is connected to the air duct on the inner wall of the outlet cover.

4. A hydrogen-cooled generator lead wire cooling air duct structure according to claim 2, characterized in that: A hard connector is provided between the upper transition lead and the tubular annular lead, and an air inlet B is provided on the hard connector.

5. The cooling air duct structure for lead wires of a hydrogen-cooled generator according to claim 1, characterized in that: The air inlet assembly includes a horizontally arranged and three-way insulating air inlet pipe; the insulating air inlet pipe includes an air inlet pipe with a horizontally arranged axis, an insulating ventilation pipe connected to the air inlet pipe at one end to form a T-shaped structure; the other end of the insulating ventilation pipe is connected to the outlet bushing.

6. A hydrogen-cooled generator lead wire cooling air duct structure according to claim 1, characterized in that: The tubular ring lead includes a main line in an arc shape with one end connected to the outlet assembly, and an inlet line connected to the end of the main line away from the outlet assembly; the air inlet A is arranged on the inlet line; and the air outlet A is arranged on the main line.

7. A cooling air duct structure for lead wires of a hydrogen-cooled generator according to claim 6, characterized in that: The air outlet A is provided with a lead-in insulation air duct.

8. A cooling method for a hydrogen-cooled generator lead-out cooling air duct structure according to any one of claims 1 to 7, characterized in that: A copper row external cooling component is used for external cooling, and a copper tube internal cooling component is used to form a cooling air path for internal cooling, and cooling is performed by combining external cooling and internal cooling; the cooling air path includes a lead cooling parallel air path and an outlet cooling parallel air path.

9. The cooling method according to claim 8, characterized in that: The use of lead cooling parallel air path for internal cooling specifically refers to: The cooled hydrogen enters the tubular annular lead from the air inlet A, flows through the air duct formed by the tubular annular lead for heat exchange, and then reaches the air outlet A; The cooled hydrogen enters the tubular annular lead from the air inlet B, flows through the air duct of the tubular annular lead for heat exchange, and then reaches the air outlet A; The hot hydrogen after heat exchange converges at outlet A and is discharged to the low-pressure area to achieve cooling of the ring lead.

10. The cooling method according to claim 8, characterized in that: The use of outlet cooling parallel air path for internal cooling specifically refers to: The cooling hydrogen enters the upper transition lead from the air inlet B, and then enters the support sleeve after passing through the upper transition lead; The cooled hydrogen enters the air inlet pipe, flows through the hollow insulating ventilation pipe, and then passes through the outlet bushing, the lower transition lead, and the support bushing in sequence; The hot hydrogen after heat exchange converges in the support casing, enters the air duct through the air outlet B, and then enters the low-pressure area.

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