CN219893140U - Carbon powder collecting device of water turbine generator set and unit cooling structure - Google Patents

Abstract

The utility model discloses a carbon powder collecting structure of a water turbine generator set and a cooling structure of the water turbine generator set, comprising a carbon powder collecting mechanism, wherein a movable groove is symmetrically arranged at the center of the assembly plate, the interiors of the two movable grooves are respectively provided with a tool plate, the inner side walls of the tool plates are respectively provided with a protective cover, the side walls of the two protective covers are respectively provided with an observation window, the tops of the two protective covers are respectively provided with a purging fan, the right side of the protective covers are connected with a dust removing device through a communicating pipe, engine carbon brush rings are arranged in the two protective covers, the two protective covers are sleeved outside the engine carbon brush rings, so that the two protective covers form a sealing space, then the purging fans purge the engine carbon brush rings, the dust removing device is convenient to suck carbon powder, the efficiency of collecting carbon powder is improved, and the supporting mechanism plays a supporting role on the two protective covers, and the stability and the tightness of the protective covers are improved.

Description

Carbon powder collecting device of water turbine generator set and unit cooling structure

Technical Field

The utility model relates to the technical field of water turbine generator sets, in particular to a carbon powder collecting structure of a water turbine generator set and a cooling structure of the water turbine generator set.

Background

The water turbine generator set generates electricity by utilizing the principle that a coil cuts a magnetic field to generate induced electromotive force, in the water turbine generator, a current collecting device is an important part of the water turbine generator set, the water turbine generator set mainly comprises a slip ring and a carbon brush device, when the water turbine generator set operates, a direct current power supply is transmitted to an excitation winding on a rotor through the carbon brush device and the slip ring to generate a magnetic field, and the coil is arranged on a stator. When the rotor rotates around the stator with the exciting winding, the coil on the stator cuts magnetic force lines to obtain current, and during the running process of the unit, the slip ring always rotates at high speed, the carbon brush device belongs to a static part, friction is necessarily generated between the slip ring and the static part, carbon brush can form carbon powder in the friction state, and the carbon powder can scatter on an insulating support between the positive pole and the negative pole of the slip ring, so that the insulation of the rotor is reduced.

The collecting ring part of the excitation system of the horizontal hydroelectric generating set of the existing power station is not provided with a carbon powder collecting device, after the set runs for a long time, the collecting ring and a carbon brush are rubbed to generate dust, the collecting ring needs to be ventilated and cooled, a protective cover of the collecting ring is not a full-closed cover, carbon powder is scattered around the set through holes, if the collecting ring is not cleaned timely, rotor insulation cannot meet the technical requirements, meanwhile, the safety running of an automatic element and the like is affected, in view of the fact that the carbon powder absorbing device is added, the carbon powder scattered in the protective cover can be better absorbed, the rotor insulation is prevented from descending, the problem of ventilation and heat dissipation is solved, the additional installation of the carbon powder collecting device of the hydroelectric generating set is very important, the carbon powder absorbing device of the existing horizontal set is only used for exhausting, the carbon powder content in extracted air is less, and the extracting efficiency is not high, and therefore the carbon powder collecting device of the hydroelectric generating set and the cooling structure of the hydraulic generating set are provided.

Disclosure of Invention

This section is intended to summarize some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments, which may be simplified or omitted in this section, as well as the description abstract and the title of the utility model, to avoid obscuring the objects of this section, description abstract and the title of the utility model, which is not intended to limit the scope of this utility model.

The present utility model has been made in view of the above and/or problems occurring in the prior art.

Therefore, the utility model aims to solve the technical problems that the existing carbon powder absorbing device of the horizontal unit only usually extracts air, the content of carbon powder in extracted air is less, and the extraction efficiency is low.

In order to solve the technical problems, the utility model provides the following technical scheme: a carbon powder collecting device of a water turbine generator set comprises,

the carbon powder collecting mechanism comprises an assembly plate, wherein movable grooves are symmetrically formed in the center of the assembly plate, a worker plate is arranged in each of the two movable grooves, a protective cover is arranged on the inner side wall of each worker plate, observation windows are arranged on the side walls of the two protective covers, a purging fan is arranged on the top of each protective cover, the protective cover is connected with a dust removing device through a communicating pipe on the right side, an engine carbon brush ring is arranged in each of the two protective covers, and a supporting mechanism is arranged below the assembly plate; the method comprises the steps of,

the hydraulic generator assembly comprises a base, a hydraulic turbine, a motor and a conversion device are arranged on the upper surface of the base, an output shaft of the hydraulic turbine is connected with the motor, an output shaft of the motor is connected with the conversion device, and an engine carbon brush ring is arranged on the output shaft of the motor.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the lower surface bilateral symmetry of assembly plate is provided with the locating plate, is connected with the transfer line through the bearing rotation between the inside wall of two locating plates, positive screw thread and reverse screw thread have been seted up to the circumference outer wall symmetry of transfer line, two the worker board respectively with positive screw thread and reverse screw thread threaded connection.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the supporting mechanism comprises a bottom plate arranged right below the assembly plate, the lower surface of the assembly plate and the upper surface of the bottom plate are hinged with hinge frames, two hinge frames are arranged in front and back symmetrically, a linkage rod is arranged between the hinge frames, a sleeve plate is sleeved on the circumferential outer wall of the linkage rod, a thread groove is formed in the left side wall of the sleeve plate, and a trapezoidal screw rod is connected with the thread groove in a threaded mode.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the circumference outer wall cover of trapezoidal lead screw is equipped with the orifice plate, and the orifice plate sets up the upper surface at the bottom plate, the circumference outer wall of trapezoidal lead screw is provided with the bearing, and the outer loop setting of bearing is at the right side wall of orifice plate, two the inner wall of gangbar all is provided with the extension rod, and the circumference outer wall of two extension rods all overlaps and is equipped with the balladeur train, and two balladeur trains all set up the lower surface at the assembly plate.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the side walls of the two template plates are provided with windows, the two windows are respectively positioned at the outer sides of the two observation windows, and the observation windows are positioned below the blowing fan.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the section of the two protection covers is bulb-shaped, the communicating pipe is communicated with the vertical pipe of the right protection cover, and the dust removing device is arranged on the upper surface of the base.

As a preferable scheme of the carbon powder collecting device of the water turbine generator set, the utility model comprises the following steps: the left ends of the transmission rod and the trapezoidal screw rod extend to the left side of the assembly plate and are provided with outer hexagonal blocks, and the left side of the positioning plate is sleeved on the outer side of the transmission rod.

The beneficial effects of the utility model are as follows: through establish two protective cover after the outside at engine carbon brush ring for a sealed space is constituteed to two safety covers, then sweeps the fan and sweep engine carbon brush ring, lifts up the carbon dust, and the dust collector of being convenient for is with the carbon dust suction, improves the efficiency of collecting the carbon dust, and supporting mechanism plays the supporting role to two safety covers, improves the stability and the leakproofness of safety cover.

In view of the fact that the temperature of the engine carbon brush ring can be reduced by the air flow blown out by the blowing fan in the carbon powder collecting device of the water turbine generator set, the cooling assembly is provided for enhancing the cooling effect of the engine carbon brush ring, and faults caused by high temperature during long-term operation of the water turbine generator set are avoided.

In order to solve the technical problems, the utility model also provides the following technical scheme: the unit cooling structure comprises the carbon powder collecting device of the water turbine generator set; the method comprises the steps of,

the cooling assembly comprises a sleeve frame arranged on the circumferential outer wall of the protective cover, wherein the two sleeve frames are respectively sleeved on the outer sides of the two sweeping fans, split boxes are symmetrically arranged in the sleeve frame, intermediate pipes are arranged between the split boxes in an array mode, and the two split boxes are communicated by the plurality of intermediate pipes.

As a preferred embodiment of the unit cooling structure of the present utility model, wherein: a fine steel wire mesh is arranged between the circumferential outer walls of the adjacent two intermediate pipes, and a plurality of intermediate pipes and the fine steel wire mesh are positioned on the outer sides of the sweeping fans.

As a preferred embodiment of the unit cooling structure of the present utility model, wherein: the top of the two split boxes is respectively provided with a cold water input pipe and a cold water output pipe, and the outer ends of the cold water input pipe and the cold water output pipe are respectively provided with a flange plate

The utility model has the beneficial effects that: through setting up the cooling subassembly, can be when sweeping the fan operation, the inhaled air current takes place heat exchange with middle pipe wall and fine steel wire net and then cools down for sweeping fan 1 blows off the air current that is less than room temperature, improves the forced air cooling effect to engine carbon brush ring.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a front cross-sectional view of the present utility model;

FIG. 3 is a perspective exploded view of the cooling assembly of the present utility model;

fig. 4 is a partial side cross-sectional view of the present utility model.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the following detailed description of the embodiments of the present utility model, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration only, and in which is shown by way of illustration only, and in which the scope of the utility model is not limited for ease of illustration. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1, fig. 2 and fig. 4, in a first embodiment of the present utility model, a carbon powder collecting device and a cooling structure for a water turbine generator set are provided, where two protection covers 104 are sleeved and installed on the outer sides of a carbon brush ring 111 of an engine, so that the two protection covers 104 form a sealed space, and then a purge fan 106 purges the carbon brush ring 111 of the engine to lift carbon powder, so that a dust removing device 108 is convenient to suck carbon powder, and efficiency of collecting carbon powder is improved, and the dust removing device 108 is in the prior art, specifically, a dust collector device.

Specifically, the carbon powder collection mechanism 100 comprises a mounting plate 101, wherein movable grooves 102 are symmetrically arranged at the left and right sides of the center of the mounting plate 101, a template plate 103 is arranged in each of the two movable grooves 102, a protecting cover 104 is arranged on the inner side wall of the template plate 103, observation windows 105 are arranged on the side walls of the two protecting covers 104, purge fans 106 are arranged on the tops of the two protecting covers 104, a dust removing device 108 is connected to the right protecting cover 104 through a communicating pipe 107, an engine carbon brush ring 111 is arranged in the two protecting covers 104, the profile of the two protecting covers 104 is bulb-shaped, the communicating pipe 107 is communicated with a vertical pipe of the right protecting cover 104, the dust removing device 108 is arranged on the upper surface of a base 201,

the hydraulic generator assembly 200 comprises a base 201, a hydraulic turbine 202, a motor 203 and a conversion device 204 are arranged on the upper surface of the base 201, an output shaft of the hydraulic turbine 202 is connected with the motor 203, an output shaft of the motor 203 is connected with the conversion device 204, and an engine carbon brush ring 111 is arranged on the output shaft of the motor 203;

the two purge fans 106 are synchronously started, the carbon powder on the surface of the carbon brush ring 111 of the engine is lifted by the air flow blown out by the purge fans 106, the dust removing device 108 is started, the carbon powder is pulled out from the two protection covers 104, the carbon powder is prevented from scattering on each part of the machine set, and the collection efficiency of the carbon powder is improved.

Specifically, the lower surface of the assembly plate 101 is symmetrically provided with positioning plates 109 from left to right, a transmission rod 110 is rotationally connected between the inner side walls of the two positioning plates 109 through bearings, a positive thread and a reverse thread are symmetrically arranged on the circumferential outer wall of the transmission rod 110, the two tool plates 103 are respectively in threaded connection with the positive thread and the reverse thread, the left ends of the transmission rod 110 and the trapezoidal screw 306 extend to the left side of the assembly plate 101 and are provided with outer hexagonal blocks 307, and the left positioning plate 109 is sleeved on the outer side of the transmission rod 110;

when two protection covers 104 are required to be mounted on the outer side of the engine carbon brush ring 111, the two protection covers 104 are firstly moved to the two sides of the engine carbon brush ring 111 respectively, the outer hexagonal blocks 307 are screwed by a handheld or electric tool, the transmission rod 110 rotates, the two construction plates 103 are respectively connected with the positive threads and the negative threads through the threads of the two construction plates 103, the two construction plates 103 move inwards under the guiding action of the movable groove 102, and the two construction plates 103 respectively drive the two protection covers 104 to move synchronously until the inner side walls of the two protection covers 104 are propped against, the engine carbon brush ring 111 is wrapped inside, and the mounting is completed.

Specifically, the side walls of the two shaping plates 103 are provided with windows, the two windows are respectively positioned at the outer sides of the two observation windows 105, and the observation windows 105 are positioned below the blowing fan 106;

the observation window 105 is made of organic glass, and an operator can observe the collection state of carbon powder in the two protection covers 104 through the observation window 105.

Example 2

Referring to fig. 1, 2 and 4, this embodiment is based on the previous embodiment, and is different from the previous embodiment in that a supporting mechanism 300 is provided below the mounting plate 101 to support the two protection covers 104, thereby improving the mounting stability and sealing performance of the protection covers 104.

Specifically, the supporting mechanism 300 comprises a bottom plate 301 arranged right below the assembly plate 101, hinge frames 302 are hinged to the lower surface of the assembly plate 101 and the upper surface of the bottom plate 301, two hinge frames 302 are symmetrically arranged front and back, a linkage rod 303 is arranged between the two hinge frames 302, a sleeve plate 304 is sleeved on the circumferential outer wall of the linkage rod 303, a threaded groove 305 is formed in the left side wall of the sleeve plate 304, a trapezoidal screw 306 is in threaded connection with the threaded groove 305, a pore plate is sleeved on the circumferential outer wall of the trapezoidal screw 306, the pore plate is arranged on the upper surface of the bottom plate 301, a bearing is arranged on the circumferential outer wall of the trapezoidal screw 306, an outer ring of the bearing is arranged on the right side wall of the pore plate, extension rods are arranged on the inner walls of the two linkage rods 303, sliding carriages are sleeved on the circumferential outer walls of the two extension rods, and the two sliding carriages are arranged on the lower surface of the assembly plate 101;

after the two protection covers 104 are sleeved and installed on the outer side of the engine carbon brush ring 111, the cushion block is placed on the position, right below the bottom plate 301, of the upper surface of the base 201, then the outer hexagonal block 307 is screwed by a handheld or electric tool, so that the trapezoidal screw rod 306 rotates, the sleeve plate 304 drives the linkage rod 303 to move leftwards through threaded connection of the trapezoidal screw rod 306 and the threaded groove 305, the two extension rods synchronously move leftwards along the inner wall of the carriage, the two hinge frames 302 are simultaneously stretched, the distance between the bottom plate 301 and the assembly plate 101 is enlarged, the bottom plate 301 moves downwards until the bottom plate 301 abuts against the upper surface of the cushion block, reinforcement and support of the two protection covers 104 are completed, and the shock resistance of the two protection covers 104 is improved.

Example 3

Referring to fig. 3, in a third embodiment of the present utility model, a unit cooling structure is provided, which can enhance the air cooling effect of the purge fan 106 on the engine carbon brush ring 111, and avoid the occurrence of faults due to high temperature during long-term operation of the water turbine generator set.

Specifically, the heat dissipation assembly 400 includes a casing 401 disposed on the circumferential outer wall of the protective cover 104, two casings 401 are respectively sleeved on the outer sides of two purge fans 106, split boxes 402 are symmetrically disposed in the casing 401, intermediate pipes 405 are disposed between the two split boxes 402 in an array manner, a plurality of intermediate pipes 405 communicate the two split boxes 402, fine steel wires 406 are disposed between the circumferential outer walls of two adjacent intermediate pipes 405, a plurality of intermediate pipes 405 and the fine steel wires 406 are disposed on the outer sides of the purge fans 106, cold water input pipes 403 and cold water output pipes 404 are disposed at the tops of the two split boxes 402, and flange plates are disposed at the outer ends of the cold water input pipes 403 and the cold water output pipes 404;

the cold water input pipe 403 and the cold water output pipe 404 at the tops of the two split boxes 402 are respectively connected into an external cold water machine through hoses, after the cold water machine is started, cold water enters the external split boxes 402 through the cold water input pipe 403, then cold water enters the internal split boxes 402 through the plurality of middle pipes 405, then the cold water flows back into the cold water machine through the cold water output pipe 404, in the process, the wall of the middle pipe 405 is cooled through heat exchange between the cold water and the wall of the middle pipe 405, the wall of the fine steel wire mesh 406 is cooled through heat exchange between the wall of the middle pipe 405 and the wall of the fine steel wire mesh 406, and when the purging fan 106 operates, the sucked air flow exchanges heat with the wall of the middle pipe 405 and the wall of the fine steel wire mesh 406 to cool, so that the purging fan 106 blows out air flow lower than the room temperature, and the air cooling effect on the engine carbon brush ring 111 is improved.

It is important to note that the construction and arrangement of the utility model as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present utility model. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility models. Therefore, the utility model is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the utility model, or those not associated with practicing the utility model).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered in the scope of the claims of the present utility model.

Claims (10)

1. The utility model provides a hydraulic turbine generating set carbon dust collection device which characterized in that: comprising the steps of (a) a step of,

the carbon powder collecting mechanism (100) comprises an assembling plate (101), wherein movable grooves (102) are symmetrically formed in the center of the assembling plate (101), a worker plate (103) is arranged in each of the two movable grooves (102), a protecting cover (104) is arranged on the inner side wall of each worker plate (103), an observation window (105) is arranged on the side wall of each protecting cover (104), a sweeping fan (106) is arranged on the top of each protecting cover (104), a dust removing device (108) is connected to the protecting cover (104) on the right through a communicating pipe (107), an engine carbon brush ring (111) is arranged in each protecting cover (104), and a supporting mechanism (300) is arranged below the assembling plate (101); the method comprises the steps of,

the hydraulic generator assembly (200) comprises a base station (201), a hydraulic turbine (202), a motor (203) and a conversion device (204) are arranged on the upper surface of the base station (201), an output shaft of the hydraulic turbine (202) is connected with the motor (203), an output shaft of the motor (203) is connected with the conversion device (204), and an engine carbon brush ring (111) is arranged on the output shaft of the motor (203).

2. The hydroturbine generator set carbon powder collection device of claim 1, wherein: the assembly plate is characterized in that positioning plates (109) are symmetrically arranged on the left and right sides of the lower surface of the assembly plate (101), a transmission rod (110) is connected between the inner side walls of the two positioning plates (109) through bearings in a rotating mode, positive threads and reverse threads are symmetrically formed in the outer circumferential wall of the transmission rod (110), and the two assembly plates (103) are respectively in threaded connection with the positive threads and the reverse threads.

3. The hydroturbine generator set carbon powder collection device of claim 2, wherein: supporting mechanism (300) are including establishing bottom plate (301) under assembly plate (101), the upper surface of lower surface and bottom plate (301) of assembly plate (101) articulates there is hinge frame (302), and the symmetry is equipped with two around hinge frame (302) be provided with gangbar (303) between hinge frame (302), the circumference outer wall cover of gangbar (303) is equipped with sleeve plate (304), thread groove (305) have been seted up to the left side wall of sleeve plate (304), thread groove (305) threaded connection has trapezoidal lead screw (306).

4. A hydroturbine generator set carbon powder collection device as recited in claim 3, wherein: the circumference outer wall cover of trapezoidal lead screw (306) is equipped with the orifice plate, and the orifice plate sets up the upper surface at bottom plate (301), the circumference outer wall of trapezoidal lead screw (306) is provided with the bearing, and the outer loop setting of bearing is at the right side wall of orifice plate, two the inner wall of gangbar (303) all is provided with the extension pole, and the circumference outer wall of two extension poles all overlaps and is equipped with the balladeur train, and two balladeur trains all set up the lower surface at assembly plate (101).

5. The carbon powder collection device of the water turbine generator set according to any one of claims 1 to 4, wherein: the side walls of the two template plates (103) are provided with windows, the two windows are respectively positioned at the outer sides of the two observation windows (105), and the observation windows (105) are positioned below the blowing fans (106).

6. The hydroturbine generator set carbon powder collection device of claim 5, wherein: the sections of the two protection covers (104) are bulb-shaped, the communicating pipe (107) is communicated with a vertical pipe of the right protection cover (104), and the dust removing device (108) is arranged on the upper surface of the base station (201).

7. The carbon powder collection device of the water turbine generator set according to any one of claims 2, 3 and 4, wherein: the left ends of the transmission rod (110) and the trapezoidal screw rod (306) extend to the left side of the assembly plate (101) and are provided with outer hexagonal blocks (307), and the left side of the positioning plate (109) is sleeved on the outer side of the transmission rod (110).

8. Unit cooling structure, its characterized in that: comprising the carbon powder collecting device of the water turbine generator set according to any one of claims 1 to 7; the method comprises the steps of,

the heat dissipation assembly (400) comprises a sleeve frame (401) arranged on the circumferential outer wall of the protective cover (104), wherein two sleeve frames (401) are respectively sleeved on the outer sides of two sweeping fans (106), split boxes (402) are symmetrically arranged in the sleeve frames (401), intermediate pipes (405) are arranged between the split boxes (402) in an array mode, and the two split boxes (402) are communicated by a plurality of intermediate pipes (405).

9. The unit cooling structure of claim 8, wherein: a fine steel wire mesh (406) is arranged between the circumferential outer walls of two adjacent intermediate pipes (405), and a plurality of intermediate pipes (405) and the fine steel wire mesh (406) are positioned on the outer side of the purging fan (106).

10. The unit cooling structure according to claim 9, wherein: the top of two reposition of redundant personnel boxes (402) is provided with cold water input tube (403) and cold water output tube (404) respectively, the outer end of cold water input tube (403) and cold water output tube (404) all is provided with the ring flange.