Special glue injection bolt for treating hydrogen leakage of generator

Abstract

The utility model relates to a special glue injection bolt for treating hydrogen leakage of a generator, which comprises a bolt head and a screw, and the bolt head is arranged at one end of the screw; a glue injection groove is formed in the surface of the screw in the length direction, and an inner glue injection runner extending to the head of the bolt is formed in the screw. The anti-leakage bolt has the advantages that the inner glue injection flow channels are formed in the head of the bolt and the screw, glue injection is conducted through the glue injection head, the glue injected into the head of the bolt flows into the glue injection groove in the side edge of the screw and then flows into the flange or the sealing face of the end cover, the anti-leakage effect is achieved at the bolt fastening position, the glue injection groove is connected with the outer portion of the head of the bolt through the smearing sealing face, and the anti-leakage effect is achieved. The sealing device is good in sealing effect, compact in structural design and high in application flexibility, has a bolt fastening function and a sealing surface glue injection function, and is obvious in hydrogen leakage treatment effect.

Description

Technical Field

[0001] The utility model relates to the technical field of gas leak plugging, in particular to a special glue injection bolt for treating hydrogen leakage of a generator. Background Art

[0002] The heating components of a generator mainly include stator windings, stator cores (hysteresis and eddy current losses), and rotor windings. It is necessary to adopt efficient cooling measures to dissipate the heat generated by these components so that the temperature of each part of the generator does not exceed the allowable value. Some generators adopt the water-hydrogen-hydrogen cooling method, that is, the stator windings and leads of the generator are cooled by water inside, the rotor windings of the generator are cooled by hydrogen inside, and the rotor body and stator core are cooled by hydrogen. For this reason, the generator is also equipped with a stator water cooling system, a generator hydrogen cooling system, and a seal oil system to prevent hydrogen from leaking out of the shaft seal.

[0003] However, the increasing hydrogen leakage during the operation of the generator has always been an important factor affecting the safe operation of the thermal power plant generator set. Among them, there is no effective treatment method for the hydrogen leakage at the end covers of the generator hydrogen coolers and various inspection holes. In many cases, only tightening bolts and externally applying sealant can be used for temporary treatment, and the effect is not good, and it is impossible to ensure the thorough treatment of the hydrogen leakage part and guarantee the long-term safe operation of the generator set.

[0004] Specifically: 1) The end covers of the generator hydrogen coolers and other inspection holes are not designed with glue injection holes, and the sealing surfaces of these end covers need to be sealed with special generator sealant. With the change of operation time and temperature, the sealant ages, and hydrogen leakage occurs; 2) During the reinstallation and glue application process of the end covers of the generator hydrogen coolers and other inspection holes, there may be uneven glue application and loose bolt tightening, resulting in air leakage after stamping inside the generator; 3) After hydrogen leakage occurs at the end cover of the generator sealing surface, the treatment effect of tightening bolts and externally applying the sealing surface is poor, and the leakage point cannot be effectively blocked, bringing great potential safety hazards to the safe operation of the generator. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a special glue injection bolt for treating hydrogen leakage of a generator.

[0006] This special glue injection bolt for treating hydrogen leakage of a generator includes: a bolt head and a screw rod, and the bolt head is arranged at one end of the screw rod; a glue injection groove is arranged on the surface of the screw rod along the length direction, and an internal glue injection flow channel extending to the bolt head is arranged inside the screw rod;

[0007] A glue injection hole is arranged on the glue injection groove, and the glue injection hole is communicated with the internal glue injection flow channel; a jack for a glue injection head is arranged on the side of the bolt head far away from the screw rod, the jack is communicated with the internal glue injection flow channel, and the glue injection head is inserted into the jack for injecting glue into the internal glue injection flow channel, the glue injection hole and the glue injection groove.

[0008] Preferably, the jack of the glue injection head, the internal glue injection channel and the screw rod are coaxially arranged, and the internal glue injection channel extends to the middle of the screw rod length.

[0009] Preferably, the glue injection groove extends from the middle of the screw rod to one end away from the bolt head. There is an overlapping section between the glue injection groove and the internal glue injection channel in the length direction of the screw rod, and the glue injection hole is arranged between the overlapping sections of the glue injection groove and the internal glue injection channel.

[0010] Preferably, the width of the bolt head is greater than the width of the glue injection head.

[0011] Preferably, there is a certain distance between the end of the screw rod away from the bolt head and the glue injection groove.

[0012] Preferably, the sizes of the glue injection hole, the glue injection groove and the internal glue injection channel match the size of the screw rod.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1) By providing an internal glue injection channel in the bolt head and the screw rod and injecting glue through the glue injection head, the glue injected into the bolt head flows into the glue injection groove on the side of the screw rod and then into the flange or the end cover sealing surface, forming an anti-leakage effect at the position of the fastening bolt. Moreover, the glue injection groove is connected to the externally smeared sealing surface of the bolt head, with good sealing effect, compact structure design, high application flexibility, combining the functions of bolt fastening and sealing surface glue injection, and obvious effect on hydrogen leakage treatment.

[0015] 2) The utility model enlarges the size of the bolt head, designs a unique glue injection channel, and the aperture of the glue injection hole is designed through tests, facilitating the entry of special sealant into the glue injection groove. The groove depth and size are calculated and verified, facilitating the entry of special sealant into the sealing surface to achieve the sealing effect. Description of the Drawings

[0016] Figure 1 It is an overall structure diagram of a special glue injection bolt for hydrogen leakage treatment of a generator;

[0017] Figure 2 It is a side view of one side of the special glue injection bolt with a grouting hole;

[0018] Figure 3 It is a side view of one side of the special glue injection bolt without a grouting hole;

[0019] Figure 4 It is a top view of the special glue injection bolt;

[0020] Figure 5 It is a cross-sectional view of the special glue injection bolt.

[0021] Description of the reference numerals: bolt head 1, screw rod 2, glue injection groove 3, glue injection head 4, glue injection hole 5, internal glue injection channel 6. Detailed implementation mode

[0022] The following further describes the present utility model in conjunction with embodiments. The description of the following embodiments is only used to help understand the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

[0023] As an embodiment, as Figures 1 to 5 shown, this special injection bolt for generator hydrogen leakage treatment includes: a bolt head 1, a screw rod 2, and an injection head 4. The bolt head 1 is provided at one end of the screw rod 2, and the width of the bolt head 1 is greater than the width of the injection head 4.

[0024] As Figure 5 shown, an internal injection glue flow channel 6 extending to the end face of the bolt head 1 is opened at the center inside the screw rod 2, and the internal injection glue flow channel 6 extends to the middle of the length of the screw rod 2. A glue injection groove 3 is opened on the surface of the screw rod 2 along the length direction, and the glue injection groove 3 extends from the middle of the screw rod 2 to the end away from the bolt head 1. There is an overlapping section between the glue injection groove 3 and the internal injection glue flow channel 6 in the length direction of the screw rod 2.

[0025] A glue injection hole 5 is opened on the glue injection groove 3. The glue injection hole 5 is arranged between the overlapping section of the glue injection groove 3 and the internal injection glue flow channel 6. The glue injection hole 5 is communicated with the internal injection glue flow channel 6. An insertion hole for the injection head 4 is opened on the side of the bolt head 1 away from the screw rod 2. The insertion hole is communicated with the internal injection glue flow channel 6. The injection head 4 is inserted into the insertion hole for injecting glue into the internal injection glue flow channel 6, the glue injection hole 5, and the glue injection groove 3. The insertion hole of the injection head 4, the internal injection glue flow channel 6, and the screw rod 2 are coaxially arranged. There is a certain distance between the end of the screw rod 2 away from the bolt head 1 and the glue injection groove 3, that is, the glue injection groove 3 is not provided at the end of the screw rod 2 to ensure the fixing effect of the end of the screw rod 2.

[0026] The aperture of the glue injection hole 5 is obtained through calculation and test. The position of the glue injection groove is accurately designed according to the thickness and size of the end cover sealing surface. The special sealing glue enters the glue injection groove 3. The depth and size of the glue injection groove 3 are calculated and verified to facilitate the special sealing glue to enter the sealing surface and achieve the sealing effect.

[0027] The bolt has high strength and can be used flexibly and reliably under various working conditions. In this embodiment, an extra-long and extra-large bolt head 1 is designed. The height and width of the bolt head 1 are greater than those of ordinary bolts, which avoids the influence of the structural strength at the bolt head 1 and the screw rod 2 due to the processing of the special interface for the glue injection joint, and improves the strength of the glue injection bolt. This kind of bolt structure has a wide range of applications and can be used during normal operation and equipment maintenance and reinstallation. It has a good sealing effect on the end cover with a glue groove on the sealing surface. It can be installed during the equipment reinstallation stage to prepare for glue injection in case of hydrogen leakage; or the glue injection bolt can be replaced emergently in case of hydrogen leakage to eliminate hydrogen leakage.

[0028] This special glue injection bolt has been applied in the existing units with good results. It solves the problem of hydrogen leakage in the end covers such as hydrogen coolers of hydrogen-cooled generator sets in thermal power plants, improves the reliability of the operation of the hydrogen system of large hydrogen-cooled generator sets, reduces the probability of shutdown of large thermal power plant units, and provides strong technical support for the reliability of the operation of the entire power grid. It solves the major industry problem that hydrogen leakage in the end covers such as hydrogen coolers cannot be handled during the operation of hydrogen-cooled generator sets, provides a reliable solution for the safe and reliable operation of hydrogen-cooled generators, and has broad popularization value for the safe operation of large hydrogen-cooled generator sets in thermal power plants.

Claims

1. A special glue injection bolt for treating hydrogen leakage in generator, characterized in that: include: A bolt head and a screw rod, wherein the bolt head is arranged at one end of the screw rod; a glue injection groove is provided on the surface of the screw rod along the length direction, and an internal glue injection flow channel extending to the bolt head is provided inside the screw rod; A glue injection hole is provided on the glue injection groove, and the glue injection hole is connected to the internal glue injection flow channel; a plug hole for a glue injection head is provided on the side of the bolt head away from the screw rod, and the plug hole is connected to the internal glue injection flow channel, and the glue injection head is inserted into the plug hole for grouting into the internal glue injection flow channel, the glue injection hole and the glue injection groove.

2. The special glue injection bolt for treating hydrogen leakage of generator according to claim 1 is characterized in that: The plug hole of the glue injection head, the internal glue injection flow channel and the screw are coaxially arranged, and the internal glue injection flow channel extends to the middle of the screw length.

3. The special glue injection bolt for treating hydrogen leakage of generator according to claim 1, characterized in that: The glue injection groove extends from the middle of the screw to the end away from the bolt head. The glue injection groove and the internal glue injection channel have overlapping sections in the length direction of the screw. The glue injection hole is arranged between the overlapping sections of the glue injection groove and the internal glue injection channel.

4. The special glue injection bolt for treating hydrogen leakage of generator according to claim 1, characterized in that: The width of the bolt head is greater than the width of the injection head.

5. The special glue injection bolt for treating hydrogen leakage of generator according to claim 1, characterized in that: There is a certain distance between the end of the screw rod away from the bolt head and the glue injection groove.

6. The special glue injection bolt for treating hydrogen leakage of generator according to claim 1, characterized in that: The sizes of the glue injection holes, glue injection grooves and internal glue injection channels match the sizes of the screw.

Images