Novel double-leakage-proof steam turbine high-pressure cylinder thermocouple cylinder penetrating screw

Abstract

The utility model provides a novel double-leakage-proof steam turbine high-pressure cylinder thermocouple cylinder penetrating screw, and relates to the field of steam turbine installation tools. The novel double-leakage-proof steam turbine high-pressure cylinder thermocouple cylinder penetrating screw comprises a cylinder penetrating screw body and nuts installed at the two ends of the cylinder penetrating screw body, and further comprises a sleeve used for fastening the nuts, a groove is formed in one side of each nut, a boss matched with the groove is fixedly connected to one side of the sleeve, and the width of the sleeve is not larger than that of the nuts; according to the novel double-leakage-proof steam turbine high-pressure cylinder thermocouple cylinder penetrating screw, clamping balls are arranged at the two ends of the cylinder penetrating screw to form a double-sealing structure, the steam leakage possibility is effectively reduced, the sealing integrity of a high-pressure cylinder is ensured, and the double-sealing effect is more remarkable; during fastening, the three bosses are inserted into the three grooves of the nut to drive the nut to rotate, so that the fastening purpose is achieved, and steam is prevented from leaking from a gap between the flange and the bolt.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine installation tool field, concretely is novel double leakproof steam turbine high pressure cylinder thermocouple screw through cylinder. BACKGROUND

[0002] In the steam turbine has superhigh pressure, first intermediate reheating, three cylinder, double exhaust, condensing steam turbine, the steam turbine is designed and installed with high, medium pressure cylinder upper half inner cylinder temperature measuring element (7), its model is: armored k type thermocouple, length is about 8~10 meters, passes through and passes through upper half outer cylinder wall installation flange hole and goes out from cylinder body, passes through metal sleeve sealing piece and transmits after sealing, in the overhaul stage of disassembly, only after the completion of upper half outer cylinder hoisting, through the destructive removal of the armored thermocouple metal compensation wire of upper half inner cylinder by forceps, upper half high pressure cylinder can be hoisted, in the stage of reinstallation, need to install new armored thermocouple again, and simultaneously upper half inner cylinder hoisting is completed and goes out, because armored thermocouple metal compensation wire is thick, high hardness, goes out from cylinder, and left and right two sides several thermocouples need to go out from cylinder simultaneously, and the operation interval is small, and 7 thermocouples go out from one flange, which brings great difficulty to the sealing of inner and outer cylinders.If the sealing is not strict, steam leakage will occur, which will reduce the economy of the unit and bring many unsafe factors.

[0003] The traditional steam turbine high pressure cylinder thermocouple screw through cylinder screw in the actual installation process, the space of high pressure cylinder outer cylinder wall is limited, install multiple thermocouples and its screw through cylinder in the limited suitable space, lead to the installation position of screw through cylinder is relatively concentrated, make screw through cylinder often difficult to guarantee every one can be evenly fastened to the appropriate degree when installing, when screw through cylinder installation is concentrated and fastening degree is inconsistent, it is easy to appear steam leakage under the high temperature and high pressure environment of high pressure cylinder. UTILITY MODEL CONTENTS

[0004] In view of the deficiency of prior art, the utility model provides novel double leakproof steam turbine high pressure cylinder thermocouple screw through cylinder, solves the problem of limited space of high pressure cylinder outer cylinder wall and steam leakage.

[0005] In order to realize the above object, the utility model is realized through the following technical scheme: novel double leakproof steam turbine high pressure cylinder thermocouple screw through cylinder, including screw through cylinder and nut installed at both ends of screw through cylinder, still including sleeve for fastening nut, one side of nut is equipped with recess, one side of sleeve is fixedly connected with boss that is suitable for recess, the width of sleeve is not greater than the width of nut.

[0006] The inside of screw through cylinder is equipped with through hole for thermocouple, and the both ends of through hole are installed with ball, and the inside of two ball is respectively provided with mounting hole A and mounting hole B, and the hole diameter of mounting hole A is greater than the hole diameter of mounting hole B.

[0007] Preferably, the through hole, mounting hole A and mounting hole B are at the same axis.

[0008] Preferably, the number of the groove and the boss is several.

[0009] Preferably, the sleeve comprises a cylinder and a rotating cover, and the two are integrally formed, and the inside of the rotating cover is provided with a hexagonal notch.

[0010] Preferably, the diameter of the cylinder hole and the width of the hexagonal notch are both greater than the diameter of the outermost circle of the cylinder screw.

[0011] Preferably, the inside of the cylinder screw is provided with a clamping groove, and the clamping ball is clamped with the clamping groove.

[0012] Compared with the prior art, the utility model has the advantages that: the double sealing structure is formed by setting the clamping ball at both ends of the cylinder screw, the possibility of steam leakage is effectively reduced, the sealing integrity of the high-pressure cylinder is ensured, even under the action of high-pressure steam, the steam can be prevented from leaking out from the gap between the thermocouple and the cylinder screw by virtue of the elastic deformation and sealing performance of the clamping ball, the clamping balls with different diameters form a stepped sealing, the clamping ball with a slightly larger inner diameter close to the steam side can better withstand the high-pressure steam pressure and fill the gap, the clamping ball with a smaller inner diameter away from the steam side has a stronger holding force on the thermocouple, further seals the small gap, and the double sealing effect is more significant, three grooves are set on the nut, three bosses are installed on the sleeve, when fastening, the three bosses are inserted into the three grooves of the nut to drive the nut to rotate, so that the fastening purpose is achieved, and the steam is prevented from leaking from the gap between the flange and the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic view of the utility model cylinder screw;

[0014] Figure 2 It is a sectional view of the utility model front view of cylinder screw;

[0015] Figure 3 It is a structure schematic view of the utility model when the boss is inserted into the groove of the nut;

[0016] Figure 4 It is a sectional view of the utility model sleeve and nut;

[0017] Figure 5 It is an exploded view of the utility model sleeve and nut.

[0018] Among them: 1, cylinder screw; 2, nut; 3, sleeve; 301, cylinder; 302, rotating cover; 4, groove; 5, boss; 6, through hole; 7, clamping ball; 8, mounting hole A; 9, mounting hole B; 10, hexagonal notch. DETAILED DESCRIPTION

[0019] As Figures 1-5 shown, the new double leakage-proof turbine high-pressure cylinder thermocouple screw includes a screw 1 and nuts 2 installed at both ends of the screw 1, the screw 1 is made of high-strength high-temperature resistant alloy material, has sufficient mechanical strength and stability to withstand the high-temperature and high-pressure environment in the high-pressure cylinder, the shape is an elongated cylinder, the surface has threads, the length of the screw is accurately calculated and customized according to the wall thickness of the high-pressure cylinder and the installation depth of the thermocouple, to ensure that the thermocouple can be accurately installed at the predetermined position, the screw 1 is used to penetrate the high-pressure cylinder wall, and further includes a sleeve 3 for fastening the nuts 2, the sleeve 3 includes a cylinder 301 and a rotating cover 302, and the two are integrally formed, the inside of the rotating cover 302 is provided with a hexagonal notch 10, a hexagonal wrench outside is inserted into the hexagonal notch 10, to facilitate the rotation of the sleeve 3 and the fastening of the nuts 2, the bore diameter of the cylinder 301 and the width of the hexagonal notch 10 are both greater than the diameter of the outermost circle of the screw 1, one side of the nut 2 is provided with a groove 4, one side of the sleeve 3 is fixedly connected with a boss 5 matched with the groove 4, the number of the groove 4 and the boss 5 is several, which is beneficial to rotate the nut 2 by rotating the sleeve 3, and the width of the sleeve 3 is not greater than the width of the nut 2.

[0020] The inside of the screw 1 is provided with a through hole 6 for the thermocouple to pass through, both ends of the through hole 6 are provided with a clamping ball 7, the inside of the screw 1 is provided with a clamping groove 11, the clamping ball 7 is clamped with the clamping groove 11, the inside of the two clamping balls 7 is respectively provided with a mounting hole A 8 and a mounting hole B 9, the bore diameter of the mounting hole A 8 is greater than the bore diameter of the mounting hole B 9, the through hole 6, the mounting hole A 8 and the mounting hole B 9 are at the same axis.

[0021] In use, the ball 7 should be a metal material, such as beryllium bronze, nickel-titanium alloy, spring steel, installation, by extrusion card ball 7 deformation occurs, so that its diameter becomes smaller, and two card ball 7 respectively into the card slot at both ends of the cylinder screw 1, disassembly, can be taken out by tweezers, then the cylinder screw 1 through the cylinder wall, nut 2 hexahedral shape, with internal threads, its thread specifications and used cylinder screw 1 matched to ensure that can be tightly screwed on the bolt, to achieve the high-pressure cylinder flange connection fastening effect, in the nut 2 one end face, evenly distributed three grooves 4, the depth of the groove 4 is moderate, both can ensure the smooth insertion of the boss 5, but also will not weaken the structural strength of the nut 2, the width of the groove 4 according to the size of the sleeve 3 boss 5 is precisely designed to achieve a tight fit, to ensure that in the fastening process, the boss 5 can be driven by the nut 2 rotation, without appearing loose or slip phenomenon; it should be noted that, due to the existing wrench its width size is larger, the space occupied is also relatively large, fastening, not easy to down wrench, the operation difficulty is relatively large, and by setting the sleeve 3 in the rotating cover 302, facilitate the external hexagonal wrench, such as L-shaped hexagonal wrench, will be inserted into the hexagonal slot 10 of the rotating cover 302, turning, so that the sleeve 3 driven nut 2 rotation, and achieve fastening, since the diameter of the cylinder 301 and the width of the hexagonal slot 10 are greater than the outermost circle of the cylinder screw 1 diameter, in the process of rotation, the sleeve 3 on the cylinder screw 1 will not cause interference, since the width of the sleeve 3 is not greater than the width of the nut 2, so that the sleeve 3 and hexagonal wrench occupies a smaller space, easy operation.

[0022] Then, the thermocouple for temperature measurement is inserted into the mounting hole B9, the mounting hole A8 and the through hole 6 of the cylinder penetrating screw 1 in turn, and extends to the high-pressure cylinder, so that the two clamping balls 7 are located at the gap between the cylinder penetrating screw 1 and the thermocouple, and the two clamping balls 7 form a double sealing structure, which greatly reduces the possibility of steam leakage. Even under the action of high-pressure steam, the two clamping balls 7 can effectively prevent steam from leaking out of the gap between the thermocouple and the cylinder penetrating screw 1 through their elastic deformation and sealing performance, ensure the sealing integrity of the high-pressure cylinder and the accuracy of the thermocouple measurement. It should be noted that the end of the cylinder penetrating screw 1 close to the mounting hole A8 is located in the high-pressure cylinder, and the end of the cylinder penetrating screw 1 close to the mounting hole B9 is located outside the high-pressure cylinder. Different diameter clamping balls 7 can form a stepped sealing structure. For example, the diameter of the mounting hole A8 is 6mm, and the diameter of the mounting hole B9 is 5mm. The clamping ball 7 close to the high-pressure cylinder steam side first blocks the steam in the first way. Since the steam pressure on this side is larger, the slightly larger inner diameter of the clamping ball 7 can better fill the gap between the thermocouple and the cylinder penetrating screw 1 and withstand larger steam pressure. The clamping ball 7 located at the other end of the cylinder penetrating screw 1 away from the steam side has a smaller inner diameter, which can generate a stronger holding force on the thermocouple. This holding force can further seal the possible small gap and cooperate with the first sealing to form a double sealing, which can more effectively prevent steam leakage.

[0023] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A novel double-leakage-proof turbine high-pressure cylinder thermocouple cylinder screw, comprising a cylinder screw (1) and a nut (2) installed at both ends of the cylinder screw (1), characterized in that: The sleeve (3) for fastening the nut (2) is provided with a groove (4) on one side, and the sleeve (3) is fixedly connected with a boss (5) matched with the groove (4) on one side, and the width of the sleeve (3) is not greater than the width of the nut (2); The through hole (6) for the thermocouple to pass through is arranged in the cylinder penetrating screw (1), the two ends of the through hole (6) are provided with clamping balls (7), the inner parts of the two clamping balls (7) are respectively provided with mounting holes A (8) and mounting holes B (9), and the hole diameter of the mounting hole A (8) is greater than that of the mounting hole B (9).

2. The novel double leak-proof turbine high pressure cylinder thermocouple through cylinder screw of claim 1, characterized in that: The through hole (6), the mounting hole A (8) and the mounting hole B (9) are at the same axis.

3. The novel double leak-proof turbine high pressure cylinder thermocouple through cylinder screw of claim 1, characterized in that: The number of the groove (4) and the boss (5) is several.

4. The novel double leak-proof turbine high pressure cylinder thermocouple through cylinder screw of claim 1, characterized in that: The sleeve (3) comprises a cylinder (301) and a rotating cover (302), and the two are integrally formed, and the inside of the rotating cover (302) is provided with a hexagonal notch (10).

5. The novel double leak-proof turbine high pressure cylinder thermocouple through cylinder screw of claim 4, characterized in that: The hole diameter of the cylinder (301) and the width of the hexagonal notch (10) are both greater than the diameter of the outermost circle of the cylinder penetrating screw (1).

6. The novel double leak-proof turbine high pressure cylinder thermocouple through cylinder screw of claim 1, wherein: The inside of the cylinder penetrating screw (1) is provided with a clamping groove (11), and the clamping ball (7) is clamped with the clamping groove (11).

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