Regulating valve capable of enabling high-speed steam flow to pass safely

Abstract

The utility model relates to the technical field of steam turbine equipment, and discloses a regulating valve capable of enabling high-speed steam flow to pass safely, which is provided with a regulating valve seat with a reducing nozzle structure, so that the pressure recovery of steam can be reduced as much as possible, and the pressure reduction function is enhanced as much as possible; by arranging the large-diameter valve rod, the inherent frequency of the valve rod is improved, and the exciting force of steam is effectively resisted; the valve seat is arranged to be inclined towards the steam outlet by 45 degrees, collision of high-speed steam flow is reduced, the steam flowing condition is improved, high-speed safe passing of steam is achieved, the pressure and temperature of steam extraction or exhaust are matched, and the steam inlet flow can be conveniently adjusted. The left adjusting valve and the right adjusting valve are vertically installed, the arrangement requirement of the steam turbine generator unit in a small space is met, additional pressure reducing valves or pressure matchers do not need to be arranged, the cost of users is saved, the requirement for on-site arrangement of a large space is reduced, the specification of the valves is greatly reduced, and meanwhile the purpose of reducing on-site noise is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine equipment, in particular to a regulating valve capable of allowing high-speed steam flow to pass safely. Conventional regulating valves are designed for low pressure loss, while this valve is designed for high speed and high pressure loss. A series of design methods are adopted to stabilize the steam flow and reduce the influence of the steam flow exciting force on the valve disc and valve seat. Background Art

[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 airflow and is then sprayed onto the blades, causing the rotor with the blade rows to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants.

[0003] In response to the national dual carbon goals, chemical plants or thermal power plants reduce costs and increase efficiency, and strengthen the utilization of waste heat within the plant. After the temperature and pressure of the turbine inlet air are determined, the extraction or exhaust steam cannot meet the user's requirements after work. The traditional approach requires matching or cooling and reducing the pressure of the extraction or exhaust steam, but requires additional matching pressure matchers or cooling and pressure reducers, and requires larger steam inlet valves and pipelines. The implementation is difficult and costly, and the on-site noise is loud during operation. Another traditional approach is to match the steam inlet parameters, which requires a pressure reducing valve, and requires larger steam inlet valves and pipelines, which increases the user's procurement cost and makes it difficult to achieve skid-mounted transportation and installation of the overall device. The above two traditional methods both have the problem of requiring a large space and are difficult to complete the layout on site. Utility Model Content

[0004] The utility model aims to provide a regulating valve which can allow high-speed steam flow to pass safely, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a regulating valve capable of safely passing high-speed steam flow, comprising a main steam valve, and further comprising:

[0006] A regulating valve body arranged on one side of the main steam valve;

[0007] A regulating assembly is arranged on one side of the main steam valve for regulating the amount of steam inlet, the regulating assembly comprises a steam inlet arranged on one side of the main steam valve, the interior of the steam inlet is connected with a steam outlet, a regulating valve seat is arranged on the inner side of the regulating valve body, the regulating valve seat is of a tapered type, a valve stem is arranged on the upper part thereof, and the steam inlet flow line of the regulating valve body and the regulating valve seat is of a downward 45° sunken design to prevent steam flow excitation force caused by mutual impact of high-speed steam flow;

[0008] A connecting component is arranged on the top of the regulating valve body to play a connecting and supporting role. The connecting component includes a connecting cover arranged on the top of the regulating valve body, a fixing bolt is arranged inside the connecting cover, a connecting cover is fixedly connected to the top of the connecting cover, and a stop rod for transportation is arranged on the inner side of the connecting cover.

[0009] Preferably, a valve disc clamping sleeve is provided on the inner wall of the regulating valve body, and the valve disc is hollow to reduce the influence of the exciting force of high-speed steam flow on the valve disc, and a sealing sleeve is fixedly connected to the inner side of the valve disc clamping sleeve.

[0010] Preferably, a valve cavity for safe passage of steam is arranged inside the regulating valve seat, and a steam inlet cavity is arranged inside the regulating valve body.

[0011] Preferably, a valve cover integrated with the valve disc clamping sleeve is arranged on the outer side of the valve stem, and a sealing ring for improving the sealing effect is arranged on the outer side of the valve stem, which is completely sealed.

[0012] Preferably, a top cover is provided on the top of the connection cover, and bolts for fixing the connection cover are provided inside the top cover.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The conventional low-flow-rate control valve of the prior art is designed to reduce valve pressure loss. The utility model adopts a high-speed steam flow design to increase valve pressure loss, so that the exhaust temperature and pressure of the steam turbine meet the user's requirements.

[0015] In the existing design technology, the valve seat generally adopts a zoom-out nozzle structure. The utility model reduces the steam flow exciting force caused by the mutual impact of high-speed steam flows by arranging an adjusting valve seat with a tapered nozzle structure.

[0016] The utility model adopts a large-diameter valve stem, high oil motor clamping force, a valve disc hollow design, and a 45° downstream sinking design for the steam inlet streamline of the valve body and valve seat, etc., which can improve the steam flow condition, realize the safe passage of steam at high speed, promote the realization of the pressure reduction function, match the pressure and temperature of the extraction or exhaust steam, and facilitate the adjustment of the steam inlet flow rate. The left and right regulating valves are installed vertically, which realizes the layout requirement of the steam turbine generator set in a smaller space, and does not require the setting of additional pressure reducing valves or pressure matching devices, saving users' costs, reducing the requirements for large space for on-site layout, greatly reducing valve specifications, and achieving the purpose of improving on-site noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a preferred embodiment of a regulating valve provided by the utility model that enables high-speed steam flow to pass safely;

[0018] Figure 2 A schematic diagram of the cross-sectional structure of the adjustment component provided by the utility model;

[0019] Figure 3 This is a schematic diagram of the connection component structure provided by the utility model.

[0020] In the figure: 1. main steam valve; 2. regulating valve body; 3. regulating assembly; 31. steam inlet; 32. steam outlet; 33. regulating valve seat; 34. valve stem; 4. connecting assembly; 41. connecting cover; 42. fixing bolt; 43. connecting cover; 44. stop rod; 5. valve disc clamping sleeve; 6. sealing sleeve; 7. valve chamber; 8. steam inlet chamber; 9. valve cover; 10. sealing ring; 11. top cover; 12. bolts. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3As shown, a regulating valve capable of safely passing high-speed steam flow comprises a main steam valve 1, a regulating valve body 2 is arranged on one side of the main steam valve 1, the regulating valve body 2 is arranged to promote the passage of steam flow, the regulating valve body 2 is placed vertically, so as to realize the requirement of small unit layout space, a regulating component 3 is arranged on one side of the main steam valve 1 for adjusting the amount of steam intake, the regulating component 3 comprises a steam inlet 31 arranged on one side of the main steam valve 1, the regulating valve body 2 is connected to the main steam valve 1 through the steam inlet 31, so as to promote the passage of steam flow, the steam inlet 31 is internally connected with a steam outlet 32, a regulating valve seat 33 is arranged on the inner side of the regulating valve body 2, the regulating valve seat 33 is of a tapered type, and a valve stem 34 is arranged on the upper part thereof, the steam inlet flow line of the regulating valve body 2 and the regulating valve seat 33 is of a downward 45° sinking type design, so as to prevent the steam flow excitation force caused by the mutual impact of high-speed steam flow, and the regulating valve seat 33 adopts a tapered nozzle, so as to avoid supersonic flow as much as possible , improve the flow of steam, and adopt a large space layout after adjusting the valve seat 33, that is, a buffer space for high-speed steam flow is given in a large space to avoid erosion caused by high-speed steam flow. The valve stem 34 is designed as an integrated whole with the valve disc, and the valve stem 34 is placed vertically. The effect brought about by the high-speed passage of steam is a pressure reducing function. At the same time, the valve stem 34 and the oil motor are designed with a high holding force, that is, the oil motor lifting force is required to be higher and the spring stiffness is larger; a connecting component 4 is arranged at the top of the regulating valve body 2 to connect and support, and the connecting component 4 includes a connecting cover 41 arranged at the top of the regulating valve body 2, and a fixing bolt 42 is arranged inside the connecting cover 41. The connecting cover 41 is connected and fixed to the valve cover 9 through two fixing bolts 42, and a connecting cover 43 is fixedly connected to the top of the connecting cover 41, and a stop rod 44 for transportation is arranged on the inner side of the connecting cover 43. The valve stem 34 is connected and fixed by the stop rod 44, which is convenient for controlling the lifting and lowering movement of the valve stem 34.

[0023] refer to Figure 2 and Figure 3As shown, the inner wall of the regulating valve body 2 is provided with a disc clamping sleeve 5. By providing the disc clamping sleeve 5, the disc is hollow, which reduces the influence of the high-speed steam flow excitation force on the disc, and can facilitate the guiding and clamping of the valve stem 34. The inner side of the disc clamping sleeve 5 is fixedly connected with a sealing sleeve 6. By providing the sealing sleeve 6, the disc clamping sleeve 5 is cooperated to improve the sealing effect, effectively reduce steam leakage, and the regulating valve seat 33 is provided with a valve cavity 7 for safe passage of steam. By providing the valve cavity 7, space is provided for the operation of the valve stem 34, which is convenient for flow. For quantity adjustment, a steam inlet chamber 8 is provided inside the regulating valve body 2. The steam inlet chamber 8 is provided to facilitate the flow of steam, so that the steam flows into the valve chamber 7 through the steam inlet chamber 8 and flows out through the steam outlet 32. A valve cover 9 integrated with the valve disc clamping sleeve 5 is provided on the outer side of the valve stem 34. The valve cover 9 cooperates with the connecting cover 41 to play a connecting and fixing role. A sealing ring 10 for improving the sealing effect is provided on the outer side of the valve stem 34, which is completely sealed. The sealing ring 10 is fixedly arranged on the inner side of the connecting cover 41 to promote and enhance the sealing of the connection between the valve stem 34 and the connecting cover 41.

[0024] refer to Figure 2 and Figure 3 As shown, a top cover 11 is provided on the top of the connecting cover 43, and the top cover 11 is used to support and position the stop rod 44 in cooperation with the connecting cover 43. Bolts 12 for fixing the connecting cover 43 are provided inside the top cover 11. By providing two bolts 12, it is convenient to install the connecting cover 43 and the top cover 11, and it is convenient for installation, disassembly and maintenance.

[0025] Working principle: When in use, the regulating valve body 2 is placed vertically, and its lower half is welded to the upper half of the cylinder. The left and right regulating valve bodies 2 have the same internal structure, which realizes the requirement of smaller unit layout space. The valve stem 34 is integrated with the valve disc, and the valve disc has a self-balancing lifting force structure. The valve stem 34 is connected and installed through the stop rod 44 and is placed vertically. The effect brought about by the high-speed passage of steam is the pressure reduction function. The valve stem 34 adopts a large diameter design to maintain stable regulation. The oil motor adopts high lifting force requirements, and the spring adopts high stiffness requirements. The regulating valve seat 33 adopts a tapered nozzle design to avoid supersonic flow as much as possible and improve the flow of steam. At the same time, a large space layout is adopted after the regulating valve seat 33, that is, a high-speed steam flow is slowed down in a large space. In order to fill the space and avoid erosion caused by high-speed steam flow, on the basis of the pressure reduction of the main steam valve 1, the regulating valve body 2, the valve stem 34, the regulating valve seat 33 with a tapered nozzle design, etc. can achieve a pressure reduction effect of about 24% under the maximum operating condition. While enabling a small-sized valve to pass a large volume flow of steam, the matching problem of exhaust parameters is partially solved. Through the cooperation of the regulating valve body 2, the valve stem 34 and the regulating valve seat 33, etc., high-speed steam can pass safely to achieve the pressure reduction function. By controlling the rise and fall of the valve stem 34, the steam inlet flow is adjusted, thereby reducing the supply of equipment, saving users' costs, reducing the large space demand for on-site installation, and realizing the overall skid-mounted transportation and installation of the unit.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A regulating valve capable of safely passing high-speed steam flow, comprising a main steam valve (1), characterized in that: Also includes: A regulating valve body (2) arranged on one side of the main steam valve (1); A regulating assembly (3) for regulating the amount of steam inlet is arranged on one side of the main steam valve (1), the regulating assembly (3) comprising a steam inlet (31) arranged on one side of the main steam valve (1), the interior of the steam inlet (31) being connected to a steam outlet (32), a regulating valve seat (33) being arranged on the inner side of the regulating valve body (2), the regulating valve seat (33) being of a tapered type, and a valve stem (34) being arranged on the upper part thereof, and a steam inlet flow line of the regulating valve body (2) and the regulating valve seat (33) being of a downward 45° sunken type design, so as to prevent steam flow excitation force caused by mutual impact of high-speed steam flows; A connecting component (4) is arranged on the top of a regulating valve body (2) to play a connecting and supporting role, the connecting component (4) comprising a connecting cover (41) arranged on the top of the regulating valve body (2), a fixing bolt (42) is arranged inside the connecting cover (41), a connecting cover (43) is fixedly connected to the top of the connecting cover (41), and a stop rod (44) for transportation is arranged on the inner side of the connecting cover (43).

2. A regulating valve capable of safely passing high-speed steam flow according to claim 1, characterized in that: The inner wall of the regulating valve body (2) is provided with a valve disc clamping sleeve (5), and the valve disc is hollow to reduce the influence of the high-speed steam flow excitation force on the valve disc, and the inner side of the valve disc clamping sleeve (5) is fixedly connected with a sealing sleeve (6).

3. A regulating valve capable of safely passing high-speed steam flow according to claim 1, characterized in that: The regulating valve seat (33) is provided with a valve cavity (7) for safe passage of steam, and the regulating valve body (2) is provided with a steam inlet cavity (8).

4. A regulating valve capable of safely passing high-speed steam flow according to claim 1, characterized in that: The outer side of the valve stem (34) is provided with a valve cover (9) which is designed to be integrated with the valve disc clamping sleeve (5), and the outer side of the valve stem (34) is provided with a sealing ring (10) which improves the sealing effect, and the sealing is completely sealed.

5. A regulating valve capable of safely passing high-speed steam flow according to claim 1, characterized in that: A top cover (11) is arranged on the top of the connection cover (43), and bolts (12) for fixing the connection cover (43) are arranged inside the top cover (11).

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