Main steam valve with pressure reduction function

Abstract

The utility model relates to the technical field of steam turbines, and discloses a main steam valve with a pressure reduction function, which comprises a valve body and a steam inlet arranged in the valve body, the steam outlet is formed in the valve body; the valve cover is arranged on the outer side of the valve body; the adjusting assembly is arranged in the valve body and used for adjusting steam pressure, the adjusting assembly comprises a filter screen arranged in the valve body, an adjusting bolt is arranged in the filter screen, and a sealing plate is arranged on the outer side of the adjusting bolt; by arranging the filter screen and the sealing plate, the position of the sealing plate can be adjusted, then the number of usable meshes of the filter screen can be adjusted, the pressure when steam flows can be reduced, meanwhile, the size of the throat part in the valve body is small, steam flowing at a high speed can rapidly pass through the throat part, and the steam flowing at a high speed can be rapidly discharged. And the steam flowing pressure is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a main steam valve with a pressure reducing function. Background Technique

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated air flow and then jets onto the blades, causing the rotor equipped with the blade row to rotate and do work externally. A steam turbine is the main equipment of a modern thermal power plant and is also used in the metallurgical industry, chemical industry, and ship power plants.

[0003] In response to the dual-carbon goal, factories and thermal power plants are committed to cost reduction and efficiency improvement, and strengthening waste heat utilization. However, during the operation of a steam turbine, although the inlet steam parameters are determined, its extraction steam or exhaust steam often does not meet the user's requirements, and pressure and temperature adjustments are required. Usually, two methods are used: adding matching equipment and adjusting the inlet steam parameters. When adding matching equipment, a pressure matcher or a temperature and pressure reducer needs to be installed. When adjusting the inlet steam parameters, a pressure reducing valve is usually used. However, when it is used, it requires a large space, and the low-pressure inlet steam volume flow is large, so it requires large valves and steam pipelines. The large-sized steam pipelines require a large on-site space, and it is difficult for some thermal power plants or chemical plants to implement. At the same time, when using a pressure reducing valve or a pressure matcher, due to equipment reasons, the on-site noise is large during operation, causing noise pollution. At the same time, it will lead to more supplied equipment, requiring components such as a pressure reducing valve, a pressure matcher, and a main steam pipeline, thus increasing the user's procurement cost. Moreover, due to the large size and quantity of the equipment, it is difficult to achieve the overall skid-mounted transportation and installation of the unit, increasing the on-site work. Content of the Utility Model

[0004] The purpose of the utility model is to provide a main steam valve with a pressure reducing function to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A main steam valve with a pressure reducing function, including a valve body, a valve cover is arranged on the outer side of the valve body, and further includes:

[0006] An inlet steam port and an outlet steam port arranged inside the valve body;

[0007] An adjusting component arranged inside the valve body for adjusting the steam pressure. The adjusting component includes a filter screen arranged inside the valve body, an adjusting bolt is arranged inside the filter screen, and a sealing plate is arranged on the outer side of the adjusting bolt.

[0008] Preferably, the filter screen further includes a connecting bolt arranged inside for connection, and a connecting block fixedly connected to one side.

[0009] Preferably, the valve body includes a clamping groove formed inside for placing the connecting block, and a valve seat provided inside for sealing.

[0010] Preferably, the valve body further includes a valve disc provided inside for controlling the steam flow rate, and a valve stem provided inside for controlling the valve disc.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] By providing an adjustment assembly in the present utility model, when the valve is shut down, the position of the sealing plate can be adjusted by reinstalling the bolts, so that the sealing plate can open or close more filter holes, thereby adjusting the passing area of the filter screen, and further adjusting the pressure of the steam flow inside the valve body. At the same time, by using a smaller throat size to replace the traditional double-valve large-bore design, when the valve body is in normal use, after the steam enters the valve body through the steam inlet, the steam can flow at a high speed, thereby achieving the effect of pressure reduction. By using a main steam valve with a pressure-reducing function, a part of the pressure reduction is borne, so as to achieve the pressure and temperature matching of the extraction steam or exhaust steam, reduce the space requirement on site, and at the same time greatly reduce the valve specification, reduce costs and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a preferred embodiment of the main steam valve with a pressure-reducing function provided by the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the adjustment assembly provided by the present utility model;

[0015] Figure 3 Provided by the present utility model Figure 1 The enlarged schematic diagram of the structure at the position A shown.

[0016] In the figure: 1, valve body; 2, steam inlet; 3, steam outlet; 4, valve cover; 5, adjustment assembly; 51, filter screen; 52, adjustment bolt; 53, sealing plate; 6, connecting bolt; 7, connecting block; 8, clamping groove; 9, valve seat; 10, valve disc; 11, valve stem. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1-3As shown, the main steam valve with a pressure reduction function includes a valve body 1, and also includes a steam inlet 2 provided inside the valve body 1. By providing the steam inlet 2, steam can smoothly enter the inside of the valve body 1; a steam outlet 3 provided inside the valve body 1. Under the action of the steam outlet 3, after the steam flows inside the valve body 1, it then flows out through the steam outlet 3, enabling the steam to flow normally; a valve cover 4 provided outside the valve body 1. Under the action of the valve cover 4, the valve body 1 can be sealed; an adjustment assembly 5 provided inside the valve body 1 for adjusting the steam pressure. The adjustment assembly 5 includes a filter screen 51 provided inside the valve body 1. The steam inside the valve body 1 is depressurized through the filter screen 51. An adjustment bolt 52 is provided inside the filter screen 51. By providing the adjustment bolt 52, the sealing plate 53 can be connected, and thus the position of the sealing plate 53 can be adjusted. A sealing plate 53 is provided outside the adjustment bolt 52. By providing the sealing plate 53, some mesh holes of the filter screen 51 can be sealed, so that the available mesh holes of the filter screen 51 can be adjusted, and further the pressure of the steam flowing inside the valve body can be adjusted.

[0019] Reference Figure 2 As shown, the filter screen 51 further includes a connecting bolt 6 provided inside for connection. By providing the connecting bolt 6, the filter screen 51 and the connecting block 7 can be connected. At the same time, multiple connecting bolts 6 can make the filter screen 51 positioned stably, and a connecting block 7 fixedly connected to one side. By providing the connecting block 7, it is convenient for the staff to place and position the filter screen 51 and the connecting block 7, thus facilitating the disassembly and assembly of the filter screen 51 by the staff.

[0020] Reference Figure 1 and Figure 3 As shown, the valve body 1 includes a clamping groove 8 provided inside for placing the connecting block 7. By providing the clamping groove 8, it is convenient for the staff to position and place the filter screen 51 during installation, and a valve seat 9 provided inside for sealing.

[0021] Reference Figure 1 As shown, the valve body 1 further includes a valve disc 10 provided inside for controlling the steam flow rate, and a valve rod 11 provided inside for controlling the valve disc 10.

[0022] Working principle: After the installation of this device, when the staff needs to perform pressure reduction operation on the pressure during steam flow, turn the adjusting bolt 52. Under the action of the adjusting bolt 52, the position of the sealing plate 53 can be adjusted. After the sealing plate 53 moves to the specified position, the sealing plate 53 can seal some of the mesh holes of the filter screen 51, reducing the number of flowable mesh holes inside the filter screen 51, thereby reducing the pressure during steam flow. At the same time, the throat size of the valve body 1 is small, which allows the high-speed flowing steam to smoothly pass through the throat and enter the valve body 1 for flow. The high-speed flowing steam can reduce the pressure. Therefore, when this device is operating normally, it can bear part of the pressure reduction, thus achieving the pressure and temperature matching of the extraction steam or exhaust steam, reducing the space requirements on site, and at the same time significantly reducing the valve specifications, reducing costs and noise.

[0023] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0024] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main steam valve with a pressure reducing function, comprising a valve body (1), a valve cover (4) being arranged on the outer side of the valve body (1), characterized in that: Also includes; A steam inlet (2) and a steam outlet (3) arranged inside the valve body (1); An adjusting component (5) is arranged inside a valve body (1) for adjusting steam pressure, the adjusting component (5) comprising a filter screen (51) arranged inside the valve body (1), an adjusting plug (52) is arranged inside the filter screen (51), and a sealing plate (53) is arranged outside the adjusting plug (52).

2. The main steam valve with pressure reducing function according to claim 1 is characterized in that: The filter screen (51) further comprises a connection bolt (6) arranged inside for connection, and a connection block (7) fixedly connected to one side.

3. The main steam valve with pressure reducing function according to claim 2 is characterized in that: The valve body (1) comprises a slot (8) provided inside for placing a connection block (7), and a valve seat (9) provided inside for sealing.

4. The main steam valve with pressure reducing function according to claim 1 is characterized in that: The valve body (1) further comprises a valve disc (10) arranged inside for controlling the steam flow, and a valve stem (11) arranged inside for controlling the valve disc (10).

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