Device for increasing power source of steam extraction quick-closing valve of steam turbine

By introducing a backup power source of instrument air into the turbine extraction steam quick-closing valve, the problem of power interruption caused by air compressor station failure was solved, and the stability of unit load and heating was achieved. The use of flanges and wedge-shaped locking washers improved connection stability and ensured the continuous operation of the production system.

CN223806190UActive Publication Date: 2026-01-16XINJIANG GUANGHUI NEW ENERGY CO LTD
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Patent Information

Application Number
CN202520774923.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-23
Publication Date
2026-01-16
Estimated Expiration
2035-04-23

AI Technical Summary

Technical Problem

The extraction steam quick-closing valve of the self-owned power plant's steam turbine mainly relies on compressed air for power. When the air compressor station fails, the compressed air supply pressure is low or interrupted, causing the extraction steam quick-closing valve to close suddenly, resulting in a sudden increase in unit load and interruption of heating, which affects the stable operation of the production system.

Method used

Instrument gas is used as a backup power source for the extraction steam quick-closing valve. Through the power instrument gas check valve and the chemical instrument gas storage tank system, it is ensured that the power source will automatically switch to the backup power source in the event of an instrument gas failure, preventing compressed air backflow. Flanges and wedge-shaped locking washers are used to improve connection stability and sealing.

Benefits of technology

In the event of an instrument gas failure, the system automatically switches to the backup power source, preventing the sudden closure of the extraction steam quick-closing valve, ensuring stable unit load and continuous heating, and improving the stability and reliability of the production system.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of steam turbine protection, in particular to a device for increasing a power source for a steam extraction quick-closing valve of a steam turbine, which comprises a steam turbine body and a steam extraction quick-closing valve body arranged on one side of the steam turbine body and used for supplying heat, and a steam extraction pipe is communicated between the steam turbine body and the steam extraction quick-closing valve body. A power source of the steam extraction quick-closing valve body is taken from instrument gas, and the inner wall of the steam extraction quick-closing valve body is communicated with a gas conveying pipe; the power instrument gas pipe and the chemical instrument gas outlet pipe are communicated with the inner wall of the gas conveying pipe, the inner wall of the chemical instrument gas outlet pipe is provided with a tank rear one-way valve and a manual valve, one end of the chemical instrument gas outlet pipe is communicated with a gas storage tank, the gas inlet end of the gas storage tank is communicated with a chemical instrument gas inlet pipe, and the inner wall of the gas storage tank is provided with a tank front one-way valve and a manual valve; when the chemical instrument gas breaks down and cannot provide compressed air, the pressure of the instrument gas main pipe is reduced, and the power instrument gas one-way valve is automatically opened to provide a power source for the steam extraction quick-closing valve body.
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Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine protection technical field, concretely is a device that steam turbine extraction speed closes valve increases power source. BACKGROUND

[0002] The steam turbine is important heat equipment in the power plant, and occupies the important production position in the fire power generation system, especially in the steam turbine of the cogeneration of the self -provisioned power plant of each factory not only assumes the task of the power generation, power supply of the whole plant, but also assumes the task of using the extraction of the unit to heat, and the extraction pipeline is configured with the speed closing valve to ensure that the steam can be closed quickly to prevent the steam from pouring into the cylinder in the case of the steam turbine failure, and prevent the major accident of the steam turbine fly.

[0003] The extraction speed closing valve of the steam turbine of the current self -provided power plant is mostly compressed air as power source, and the compressed air is mainly provided by the air compressor station in the power plant, when the air compressor station fails, the compressed air supply pressure is low or the compressed air is interrupted, and then the extraction speed closing valve is suddenly closed, causing the unit load to rise suddenly, the heat supply is interrupted, and the stable operation of the whole production system is affected. UTILITY MODEL CONTENTS

[0004] The utility model discloses a device that steam turbine extraction speed closing valve increases power source to solve the problem in the background art.

[0005] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a device that steam turbine extraction speed closing valve increases power source, including steam turbine body, still including:

[0006] The extraction speed closing valve body for heating is arranged at one side of the steam turbine body, the steam turbine body and the extraction speed closing valve body are communicated with the extraction pipe, the power source of the extraction speed closing valve body is taken from the instrument gas, and the inner wall of the extraction speed closing valve body is communicated with the gas conveying pipe.

[0007] The power instrument gas pipe is communicated in the inner wall of the gas conveying pipe, and the power instrument gas one-way valve is installed on the inner wall of the power instrument gas pipe.

[0008] The chemical instrument gas outlet pipe is communicated at one end of the gas conveying pipe, one end of the chemical instrument gas outlet pipe is communicated with the gas storage tank, and the gas inlet pipe of the chemical instrument is communicated with the gas inlet pipe of the chemical instrument.

[0009] The tank front one-way valve and tank front hand valve are arranged on the inner wall of the chemical instrument gas inlet pipe, and the tank rear one-way valve and tank rear hand valve are arranged on the inner wall of the chemical instrument gas outlet pipe.

[0010] The connecting piece is arranged outside the steam extraction speed closing valve body, the power instrument air one-way valve, the front tank one-way valve, the front tank manual valve, the rear tank one-way valve and the rear tank manual valve, and is used for mounting the valve body.

[0011] Preferably, the connecting piece comprises a first flange plate fixed to one end of the steam extraction pipe, and a second flange plate fixed to the outside of the steam extraction speed closing valve body, and the first flange plate is in contact with the second flange plate.

[0012] Preferably, the inner walls of the first flange plate and the second flange plate are both provided with threaded holes, the inner walls of the threaded holes are threadedly connected with bolts, and the outer sides of the bolts are threadedly connected with nuts.

[0013] Preferably, the inner walls of the first flange plate and the second flange plate are both provided with first sealing grooves, and the first sealing grooves are provided with first sealing rings.

[0014] Preferably, the outer sides of the bolts are respectively sleeved with first wedge-shaped locking washers and second wedge-shaped locking washers, and the opposite surfaces of the first wedge-shaped locking washer and the second wedge-shaped locking washer are both provided with sawteeth.

[0015] Preferably, the opposite surfaces of the first wedge-shaped locking washer and the second wedge-shaped locking washer are both provided with wedge-shaped strips, and the first wedge-shaped locking washer and the second wedge-shaped locking washer are clamped through the wedge-shaped strips.

[0016] Preferably, the inner wall of the nut is provided with a second sealing groove, and the second sealing groove is provided with a second sealing ring.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] When the instrument air pressure is reduced or compressed air cannot be provided due to instrument air failure, the power instrument air one-way valve is automatically opened to enter the steam extraction speed closing valve through the instrument air main pipe, and the one-way valves are arranged in front of and behind the chemical instrument air storage tank to prevent the backflow of compressed air. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A preferred embodiment structure diagram of the device for adding a power source to the steam turbine steam extraction speed closing valve is provided.

[0020] Figure 2 A structure diagram of the connecting piece is provided.

[0021] Figure 3 A structure diagram of the bolt is provided.

[0022] Figure 4 A structure diagram of the nut is provided.

[0023] In the figure: 1, turbine body; 2, steam extraction pipe; 3, gas conveying pipe; 4, steam extraction speed closing valve body; 5, power instrument gas pipe; 6, power instrument gas one-way valve; 7, chemical instrument gas outlet pipe; 8, gas storage tank; 9, chemical instrument gas inlet pipe; 10, pre-tank one-way valve; 11, pre-tank manual valve; 12, post-tank one-way valve; 13, post-tank manual valve; 14, connecting piece; 141, first flange plate; 142, second flange plate; 143, threaded hole; 144, bolt; 145, nut; 146, first sealing groove; 147, first sealing ring; 15, first wedge-shaped locking washer; 16, second wedge-shaped locking washer; 17, sawtooth; 18, wedge-shaped strip; 19, second sealing groove; 20, second sealing ring. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model will be described in detail as follows in combination with the drawings and preferred embodiments.

[0025] Please refer to Figures 1-4 As shown in the figure, a device for increasing power source of steam extraction speed closing valve of steam turbine, comprising a turbine body 1; further comprising a steam extraction speed closing valve body 4 arranged on one side of the turbine body 1 for heating, a steam extraction pipe 2 is communicated between the turbine body 1 and the steam extraction speed closing valve body 4, the power source of the steam extraction speed closing valve body 4 is taken from instrument gas, the inner wall of the steam extraction speed closing valve body 4 is communicated with a gas conveying pipe 3, by arranging the steam extraction pipe 2, the turbine body 1 and the steam extraction speed closing valve body 4 can be communicated, the instrument gas is sent into the turbine body 1, by arranging the gas conveying pipe 3, the gas can be conveyed, the steam extraction speed closing valve body 4 is the main protection equipment between the steam turbine and the steam extraction pipe network.

[0026] A power instrument gas pipe 5 is communicated in the inner wall of the gas conveying pipe 3, a power instrument gas one-way valve 6 is installed in the inner wall of the power instrument gas pipe 5, by arranging the power instrument gas pipe 5, the power compressed air can be conveniently conveyed, the power instrument gas pipe 5 is communicated with an air compression device.

[0027] A chemical instrument gas outlet pipe 7 is communicated at one end of the gas conveying pipe 3, one end of the chemical instrument gas outlet pipe 7 is communicated with a gas storage tank 8, an inlet end of the gas storage tank 8 is communicated with a chemical instrument gas inlet pipe 9, the chemical instrument gas outlet pipe 7 is used for conveying chemical instrument gas, the chemical instrument gas generally comes from the compressed air of an air separation device, after the instrument gas is stored in the gas storage tank 8 through the chemical instrument gas inlet pipe 9, the instrument gas enters the chemical instrument gas outlet pipe 7.

[0028] The tank front check valve 10 and the tank front manual valve 11 arranged on the inner wall of the chemical instrument air inlet pipe 9 can facilitate the staff to control the chemical instrument air inlet pipe 9; the tank rear check valve 12 and the tank rear manual valve 13 arranged on the inner wall of the chemical instrument air outlet pipe 7 are normally closed when the chemical instrument air supply and extraction steam speed valve is running, and the power instrument air is used as backup.

[0029] The connecting piece 14 arranged on the outer side of the extraction steam speed closing valve body 4, the power instrument air check valve 6, the tank front check valve 10, the tank front manual valve 11, the tank rear check valve 12 and the tank rear manual valve 13 is used for installing the valve body, and the connecting piece 14 can be arranged to install and disassemble and replace the extraction steam speed closing valve body 4, the power instrument air check valve 6, the tank front check valve 10, the tank front manual valve 11, the tank rear check valve 12 and the tank rear manual valve 13; the connecting piece 14 includes a first flange plate 141 fixed to one end of the extraction pipe 2, a second flange plate 142 fixed to the outer side of the extraction steam speed closing valve body 4, the first flange plate 141 in contact with the second flange plate 142, and the first flange plate 141 and the second flange plate 142 connected by the first flange plate 141 and the second flange plate 142 can facilitate the installation of the extraction pipe 2 and the extraction steam speed closing valve body 4; the inner wall of the first flange plate 141 and the second flange plate 142 is provided with a threaded hole 143, the inner wall of the threaded hole 143 is provided with a bolt 144, the outer side of the bolt 144 is provided with a nut 145, the threaded hole 143 can be arranged to install the bolt 144, the size of the bolt 144 is matched with the inner diameter of the threaded hole 143, the first flange plate 141 and the second flange plate 142 are fixed by screwing the bolt 144 in the first flange plate 141 and the second flange plate 142 and cooperating with the nut 145, and then the extraction pipe 2 and the extraction steam speed closing valve body 4 can be fixed; the inner wall of the first flange plate 141 and the second flange plate 142 is provided with a first sealing groove 146, and the first sealing groove 146 is provided with a first sealing ring 147, the first sealing groove 146 is arranged in the first flange plate 141 and the second flange plate 142, the first sealing ring 147 is arranged in the first sealing groove 146, and the first sealing ring 147 is arranged between the first flange plate 141 and the second flange plate 142 to improve the sealing performance during connection and prevent gas leakage.

[0030] The outer side of the bolt 144 is respectively sleeved with a first wedge-shaped locking washer 15 and a second wedge-shaped locking washer 16, and the first wedge-shaped locking washer 15 and the second wedge-shaped locking washer 16 are provided with sawteeth 17 on the opposite faces; the opposite faces of the first wedge-shaped locking washer 15 and the second wedge-shaped locking washer 16 are provided with wedge-shaped strips 18, and the first wedge-shaped locking washer 15 and the second wedge-shaped locking washer 16 are clamped through the wedge-shaped strips 18; the cooperation of the first wedge-shaped locking washer 15 and the second wedge-shaped locking washer 16 can avoid loosening of the bolt 144 after long-time use, thereby improving the connecting effect of the first flange plate 141 and the second flange plate 142; the sawteeth 17 can reduce abrasion, increase the fastening effect of the bolt 144, and improve stability; and the wedge-shaped strips 18 can facilitate clamping of the first wedge-shaped locking washer 15 and the second wedge-shaped locking washer 16 through wedge-shaped effect.

[0031] The inner wall of the nut 145 is provided with a second sealing groove 19, and the second sealing groove 19 is provided with a second sealing ring 20; the second sealing groove 19 is arranged in the nut 145, and the second sealing ring 20 is arranged in the second sealing groove 19; when the nut 145 is used in cooperation with the bolt 144, the fastening effect is improved, thereby improving the connecting effect of the first flange plate 141 and the second flange plate 142.

[0032] Working principle: when the steam turbine body 1 normally works, the chemical instrument gas runs through the chemical instrument gas inlet pipe 9, the gas storage tank 8, the chemical instrument gas outlet pipe 7, the gas conveying pipe 3 and the steam extraction speed valve body 4, and the power instrument gas one-way valve 6 is in a closed state; when a fault occurs, the power instrument gas one-way valve 6 is opened, and the power instrument gas pipe 5, the gas conveying pipe 3 and the steam extraction speed valve body 4 run, and the tank front manual valve 11 and the tank rear one-way valve 12 are closed.

[0033] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and any indirect modification, equivalent change and modification of the above-mentioned technical content, which does not depart from the technical solution of the present application, are still within the scope of the present application.

Claims

1. A device for increasing a power source by means of a steam turbine extraction speed closure valve, comprising a steam turbine body (1), characterized in that, Also include: The steam extraction speed valve body (4) is arranged on one side of the steam turbine body (1) to supply heat, the steam turbine body (1) and the steam extraction speed valve body (4) are communicated with the steam extraction pipe (2), the power source of the steam extraction speed valve body (4) is taken from the instrument air, and the inner wall of the steam extraction speed valve body (4) is communicated with the gas conveying pipe (3); The power instrument air pipe (5) is communicated in the inner wall of the gas conveying pipe (3), and the inner wall of the power instrument air pipe (5) is provided with a power instrument air check valve (6); The chemical instrument air outlet pipe (7) is communicated at one end of the gas conveying pipe (3), one end of the chemical instrument air outlet pipe (7) is communicated with the gas storage tank (8), and the gas inlet end of the gas storage tank (8) is communicated with the chemical instrument air inlet pipe (9); The tank front check valve (10) and the tank front manual valve (11) are arranged on the inner wall of the chemical instrument air inlet pipe (9), and the inner wall of the chemical instrument air outlet pipe (7) is provided with a tank rear check valve (12) and a tank rear manual valve (13); The connecting piece (14) is arranged outside the steam extraction speed valve body (4), the power instrument air check valve (6), the tank front check valve (10), the tank front manual valve (11), the tank rear check valve (12) and the tank rear manual valve (13) for mounting the valve body.

2. A device for adding a power source to a steam turbine extraction speed control valve according to claim 1, characterized in that: The connecting piece (14) includes a first flange plate (141) fixed to one end of the steam extraction pipe (2), and a second flange plate (142) fixed outside the steam extraction speed valve body (4).

3. A device for adding a power source to a steam turbine extraction speed control valve according to claim 2, characterized in that: The inner wall of the first flange plate (141) and the second flange plate (142) is provided with a threaded hole (143), the inner wall of the threaded hole (143) is threadedly connected with a bolt (144), and the outer side of the bolt (144) is threadedly connected with a nut (145).

4. The device for increasing the power source by the steam turbine extraction quick-closing valve according to claim 2, characterized in that: The inner wall of the first flange plate (141) and the second flange plate (142) is provided with a first sealing groove (146), and the first sealing groove (146) is provided with a first sealing ring (147).

5. The device for increasing the power source by the steam turbine extraction quick-closing valve according to claim 3, characterized in that: The outer side of the bolt (144) is respectively provided with a first wedge-shaped locking washer (15) and a second wedge-shaped locking washer (16), and the opposite sides of the first wedge-shaped locking washer (15) and the second wedge-shaped locking washer (16) are provided with sawteeth (17).

6. A device for adding a power source to a steam turbine extraction speed control valve according to claim 5, characterized in that: The opposite sides of the first wedge-shaped locking washer (15) and the second wedge-shaped locking washer (16) are provided with wedge-shaped strips (18), and the first wedge-shaped locking washer (15) and the second wedge-shaped locking washer (16) are clamped through the wedge-shaped strips (18).

7. The device for increasing the power source by the steam turbine extraction quick-closing valve according to claim 3, characterized in that: The inner wall of the nut (145) is provided with a second sealing groove (19), and the second sealing groove (19) is provided with a second sealing ring (20).