Thermal steam trap of thermal power plant steam turbine

Abstract

The utility model relates to the technical field of thermal steam traps, in particular to a thermal steam trap for a steam turbine of a thermal power plant, which intercepts cold water in a pipeline through an intercepting device, prevents condensate water from entering next equipment along with steam, and is convenient for operators to quickly replace equipment components through a connecting structure. Impurities in condensate water are screened out through the filtering device, the condensate water is automatically drained through the drainage device, overflow of steam is reduced, and the practicability of the device is improved; comprising an intercepting device, a connecting structure, a filtering device and a drainage device, the connecting structure is installed on the intercepting structure, the filtering device is installed on the connecting structure, and the drainage device is installed on the connecting structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal drain trap, in particular to a thermal drain trap for steam turbine of thermal power plant. BACKGROUND

[0002] The thermal drain trap for steam turbine of thermal power plant is a kind of key equipment, is used to separate water and steam effectively in steam system, ensure the normal operation and high efficiency of system;Thermal drain trap, also known as drain valve or automatic drain, is the device that utilizes fluid dynamics principle, controls drain hole automatic opening and closing according to the thermal physical difference of water and steam itself;In thermal power plant steam turbine system, the main function of thermal drain trap is to separate and exclude condensate in steam pipeline, simultaneously prevent steam leakage, to keep the stability and high efficiency of steam system.

[0003] The prior art patent with the application number CN202121538367.0 relates to a thermal drain trap for steam turbine of thermal power plant, including drain trap main part, fixed cap, link pipe, limiting bolt, support column, inner pipe, sealing ring and limiting block, can reset movable piece by the elastic force of spring, avoid the situation that single use movable piece is difficult to reset.

[0004] But the above-mentioned device does not have the ability to discharge condensate in actual use, and does not have the ability to filter condensate. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a kind of thermal drain trap for steam turbine of thermal power plant, which is used to intercept the cold water in pipeline, prevent condensate from entering the next equipment with steam, replace equipment components quickly by connection structure, filter the impurities in condensate by filter device, automatically discharge condensate by drainage device, reduce steam overflow, improve the practicability of the device.

[0006] The utility model provides a kind of thermal drain trap for steam turbine of thermal power plant, which is used to intercept the cold water in pipeline, prevent condensate from entering the next equipment with steam, replace equipment components quickly by connection structure, filter the impurities in condensate by filter device, automatically discharge condensate by drainage device, reduce steam overflow, improve the practicability of the device.

[0007] Preferably, the intercepting device comprises a main pipe, a flange plate, a baffle plate and a drain connector, a group of flange plates are connected to the input end and the output end of the main pipe respectively, a drain connector is arranged in the middle of the main pipe, a group of baffle plates are arranged in the upper part and the lower part of the main pipe respectively, the upper baffle plate is located between the drain connector and the steam output end of the main pipe, and the lower baffle plate is located between the drain connector and the steam input end of the main pipe; the lower baffle plate is used to intercept the condensed water in the lower part of the main pipe, so that the condensed water is prevented from entering the next device along with the steam, the flange plates are used to facilitate the connection between the main pipe and the device, and the drain connector is used to drain the condensed liquid from the flange plate, thereby reducing the amount of condensed water in the steam pipe, reducing the backflow of condensed water from the pipe to the inside of the device, and improving the practicability of the device.

[0008] Preferably, the connecting structure comprises a collection cabin, a sealing groove, a sealing rubber strip and an external thread connector, the lower part of the collection cabin is in the shape of a bucket, the external thread connector is arranged on the upper end face of the collection cabin, the inner side face of the drain connector is provided with an internal thread, the collection cabin is connected to the drain connector through the external thread connector, the sealing groove is arranged on the corresponding position between the upper end face of the collection cabin and the lower end face of the drain connector, and the sealing rubber strip is located between the upper and lower sealing grooves; the sealing rubber strip is used to increase the sealing performance of the connection between the collection cabin and the main pipe, the collection cabin is used to collect the condensed liquid, and the connecting structure of the drain connector and the external thread connector is used to facilitate the quick replacement of the collection cabin, thereby improving the practicability of the device.

[0009] Preferably, the filtering device comprises a first fixing frame, a flow guide disc and an annular filter screen, a plurality of groups of first fixing frames are arranged on the upper part of the collection cabin and connected to the flow guide disc, the top of the flow guide disc is in the shape of a cone, and the annular filter screen is arranged between the edge of the flow guide disc and the collection cabin; the first fixing frame and the flow guide disc are used to receive the condensed water, and the condensed water slides from the inner side face edge of the collection cabin, the impurities in the condensed water are filtered by the annular filter screen, the impurities in the condensed water are reduced to enter the drain device, and the influence on the normal operation of the drain device is reduced.

[0010] Preferably, the outer side of the annular filter screen is downwardly inclined; the outer side of the annular filter screen is downwardly inclined, so that the impurities slide and accumulate on the outer side edge of the annular filter screen, and the influence of the impurities accumulated on the annular filter screen on the filtering area of the annular filter screen is reduced.

[0011] Preferably, the drainage device comprises a second fixing frame, a limiting pipe, a lifting rod, a sealing plug and a float box, the lower part of the collecting cabin is provided with the limiting pipe through a plurality of groups of the second fixing frame, the lifting rod is located in the inner hole of the limiting pipe and can move up and down, the upper end surface of the lifting rod extends to the upper side of the limiting pipe and is connected with the lower end surface of the float box, the lower end surface of the lifting rod extends to the lower side of the limiting pipe and is connected with the sealing plug, and the lower part of the sealing plug is conical and fits the size of the conical inner wall of the lower part of the collecting cabin; the sealing plug is pressed to the bottom side of the collecting cabin through the self weight of the lifting rod, the sealing plug and the float box, so that the bottom side of the collecting cabin is sealed, the overflow of steam from the bottom of the collecting cabin is reduced, when the liquid level of the condensed water collected in the collecting cabin is lifted to the height of the upper end surface of the float box, the condensed water can be discharged from the bottom of the collecting cabin due to the upward floating of the float box, the sealing plug and the lifting rod, the lifting process of the lifting rod is limited through the limiting pipe, and the practicability of the device is improved.

[0012] Preferably, the device further comprises a tee pipe, a jacking rod and a compression spring, the tee pipe is connected to the output end of the bottom of the collecting cabin, the jacking rod is inserted into the tee pipe from the bottom port of the tee pipe, the jacking rod is sealingly connected with the bottom port of the tee pipe, and the bottom port of the sealing rubber strip is connected with the bottom of the jacking rod through the compression spring; the condensed water is output through the output port of the side of the tee pipe, when the drainage device fails to normally drain water, the upper end surface of the jacking rod is pushed upward to lift the sealing plug upward, so that rapid drainage is completed, the jacking rod is assisted to return to the original position through the compression spring, and the practicability of the device is improved.

[0013] Compared with the prior art, the device has the beneficial effects that: the cold water in the pipeline is intercepted through the intercepting device, the condensed water is prevented from entering the next equipment along with the steam, the equipment components are conveniently replaced by the operator through the connecting structure, the impurities in the condensed water are screened out through the filtering device, the condensed water is automatically discharged through the drainage device, the overflow of steam is reduced, and the practicability of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the axonometric structure schematic diagram of the device;

[0015] Figure 2 is the first cross-sectional structure schematic diagram of the device;

[0016] Figure 3 is the second cross-sectional structure schematic diagram of the device;

[0017] Figure 4 is the local enlarged structure schematic diagram of the device;

[0018] Marked in the drawing: 1, main pipeline; 2, flange plate; 3, baffle; 4, drainage joint; 5, collection cabin; 6, sealing groove; 7, sealing rubber strip; 8, external thread connector; 9, first fixing frame; 10, flow guide disc; 11, annular filter screen; 12, second fixing frame; 13, limiting tube; 14, lifting rod; 15, sealing plug; 16, float box; 17, tee pipe; 18, jacking rod; 19, compression spring. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] EMBODIMENT

[0021] As shown in the connection structure is installed on the intercepting device, the filtering device is installed on the connection structure, and the drainage device is installed on the connection structure; Figure 1 Figure 2 , Figure 3 and Figure 4 First, the lower baffle 3 intercepts the lower condensate in the main pipeline 1, and the condensate is discharged from the flange plate 2 to the inside of the collection cabin 5 through the drainage joint 4. The first fixing frame 9 and the flow guide disc 10 receive the condensate that drips down, and make the condensate slide off the inside edge of the collection cabin 5. The annular filter screen 11 filters the impurities in the condensate. When the liquid level of the condensate collected in the collection cabin 5 rises to the height of the upper end surface of the float box 16, the float box 16, the sealing plug 15 and the lifting rod 14 are lifted due to the liquid buoyancy, so that the condensate is discharged from the bottom of the collection cabin 5.

[0022] The intercepting device includes the main pipeline 1, the flange plate 2, the baffle 3 and the drainage joint 4. The input end and the output end of the main pipeline 1 are respectively connected with a group of flange plates 2. The middle part of the main pipeline 1 is provided with the drainage joint 4. The upper part and the lower part of the main pipeline 1 are respectively provided with a group of baffles 3. The upper baffle 3 is located between the drainage joint 4 and the steam output end of the main pipeline 1. The lower baffle 3 is located between the drainage joint 4 and the steam input end of the main pipeline 1.

[0023] The connection structure includes the collection cabin 5, the sealing groove 6, the sealing rubber strip 7 and the external thread connector 8. The lower part of the collection cabin 5 is in the shape of a bucket. The upper end surface of the collection cabin 5 is provided with the external thread connector 8. The inner surface of the drainage joint 4 is provided with an internal thread. The collection cabin 5 is connected with the drainage joint 4 through the external thread connector 8. The upper end surface of the collection cabin 5 and the lower end surface of the drainage joint 4 are provided with the sealing groove 6 at the corresponding positions. The sealing rubber strip 7 is located between the upper and lower two groups of sealing grooves 6.

[0024] The connection structure includes the collection cabin 5, the sealing groove 6, the sealing rubber strip 7 and the external thread connector 8. The lower part of the collection cabin 5 is in the shape of a bucket. The upper end surface of the collection cabin 5 is provided with the external thread connector 8. The inner surface of the drainage joint 4 is provided with an internal thread. The collection cabin 5 is connected with the drainage joint 4 through the external thread connector 8. The upper end surface of the collection cabin 5 and the lower end surface of the drainage joint 4 are provided with the sealing groove 6 at the corresponding positions. The sealing rubber strip 7 is located between the upper and lower two groups of sealing grooves 6.​

[0025] The filtering device comprises a first fixing frame 9, a flow guide disc 10 and an annular filter screen 11, a plurality of groups of the first fixing frame 9 are connected with the flow guide disc 10 at the upper part of the collecting cabin 5, the top of the flow guide disc 10 is conical, and the annular filter screen 11 is arranged between the edge of the flow guide disc 10 and the collecting cabin 5;

[0026] The outer side of the annular filter screen 11 is also inclined downward;

[0027] The drainage device comprises a second fixing frame 12, a limiting pipe 13, a lifting rod 14, a sealing plug 15 and a floating box 16, the lower part of the collecting cabin 5 is arranged with the limiting pipe 13 through a plurality of groups of the second fixing frame 12, the lifting rod 14 is arranged in the inner hole of the limiting pipe 13 and can move up and down, the upper end surface of the lifting rod 14 extends to the upper side of the limiting pipe 13 and is connected with the lower end surface of the floating box 16, the lower end surface of the lifting rod 14 extends to the lower side of the limiting pipe 13 and is connected with the sealing plug 15, and the lower part of the sealing plug 15 is conical and matches the size of the conical inner wall of the lower part of the collecting cabin 5;

[0028] The device further comprises a tee pipe 17, a jacking rod 18 and a compression spring 19, the tee pipe 17 is connected to the output end of the bottom of the collecting cabin 5, the jacking rod 18 is inserted into the tee pipe 17 from the bottom port of the tee pipe 17, the jacking rod 18 is sealingly connected with the bottom port of the tee pipe 17, and the bottom port of the sealing rubber strip 7 is connected with the bottom of the jacking rod 18 through the compression spring 19;

[0029] The cold water in the pipeline is intercepted by the intercepting device, so that the condensed water is prevented from entering the next device along with the steam, the connecting structure facilitates the replacement of the device components by the operator, the impurities in the condensed water are screened out by the filtering device, the condensed water is automatically drained by the drainage device, the overflow of the steam is reduced, and the practicability of the device is improved.

[0030] As shown in Figures 1 to 4 As shown in the drawings, the thermal drain trap of the steam turbine of the thermal power plant of the utility model, when working, first intercepts the condensed water in the lower part of the main pipeline 1 through the lower baffle 3, drains the condensed liquid from the flange plate 2 to the inside of the collecting cabin 5 through the drainage joint 4, receives the dripping condensed water through the first fixing frame 9 and the flow guide disc 10, and makes the condensed water slide from the inside edge of the collecting cabin 5, filters the impurities in the condensed water in cooperation with the annular filter screen 11, when the liquid level of the condensed water collected in the collecting cabin 5 is lifted to the height of the upper end surface of the floating box 16, the floating box 16, the sealing plug 15 and the lifting rod 14 are lifted due to the liquid buoyancy, so that the condensed water can be drained from the bottom of the collecting cabin 5.

[0031] The flange plate 2 of the thermal drain of the steam turbine of the power plant is purchased on the market, and the technical personnel in the industry only needs to install and operate according to the attached instruction manual, and does not need the technical personnel in the field to pay the creative labor.

[0032] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principle of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the utility model.

Claims

1. A thermal drain for a steam turbine of a fossil fuel power plant; characterized in that, The utility model relates to a steam collecting device, including intercepting device, connecting structure, filter device and drainage device, connecting structure installs on intercepting structure, filter device installs on connecting structure, drainage device installs on connecting structure, intercepting device includes main pipeline (1), flange (2), baffle (3) and drainage joint (4), the input end and output end of main pipeline (1) are connected with a group of flange (2) respectively, the middle part of main pipeline (1) is provided with drainage joint (4), the upper portion and lower portion in main pipeline (1) are provided with a group of baffle (3) respectively, upper portion baffle (3) is located between drainage joint (4) and the steam output end of main pipeline (1), lower portion baffle (3) is located between drainage joint (4) and the steam input end of main pipeline (1), connecting structure includes collection cabin (5), sealing groove (6), sealing rubber strip (7) and outer thread connector (8), the lower portion of collection cabin (5) is bucket-shaped, the upper end surface of collection cabin (5) is provided with outer thread connector (8), the inner side of drainage joint (4) is provided with inner thread, collection cabin (5) is connected with drainage joint (4) through outer thread connector (8), the upper end surface of collection cabin (5) and the lower end surface of drainage joint (4) are provided with sealing groove (6) on the corresponding position, sealing rubber strip (7) is located between the upper and lower two groups of sealing groove (6), filter device includes first fixed frame (9), flow guide disc (10) and annular filter screen (11), the upper portion in collection cabin (5) is connected with flow guide disc (10) through multiple groups of first fixed frame (9), the top of flow guide disc (10) is conical, and annular filter screen (11) is installed between the edge of flow guide disc (10) and collection cabin (5), drainage device includes second fixed frame (12), limiting pipe (13), lifting rod (14), sealing plug (15) and float box (16), the lower portion of collection cabin (5) is installed with limiting pipe (13) through multiple groups of second fixed frame (12), lifting rod (14) is located in the inner hole of limiting pipe (13) and can move up and down, the upper end surface of lifting rod (14) extends to the upper side of limiting pipe (13) and is connected with the lower end surface of float box (16), the lower end surface of lifting rod (14) extends to the lower side of limiting pipe (13) and is connected with sealing plug (15), and the lower portion of sealing plug (15) is conical and fits the size of the conical inner wall of the lower portion in collection cabin (5).

2. A thermal drain for a steam turbine of a fossil fuel power plant according to claim 1, characterized in that The outer side of the annular filter screen (11) is downwardly inclined.

3. A thermal drain for a steam turbine of a fossil fuel power plant according to claim 2, characterized in that The utility model further includes a tee pipe (17), a jacking rod (18) and a compression spring (19), the tee pipe (17) is connected to the bottom output end of the collection cabin (5), the jacking rod (18) is inserted into the tee pipe (17) from the bottom port of the tee pipe (17), the jacking rod (18) is sealingly connected to the bottom port of the tee pipe (17), and the bottom port of the sealing rubber strip (7) is connected to the bottom of the jacking rod (18) through the compression spring (19).

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