Multistage depressurization regulating valve for black water

Abstract

The black water multistage depressurization regulating valve comprises a valve body and a valve rod, a valve body inlet and a sleeve which are communicated with each other are arranged in the valve body, a valve cover and a flow guide pipe are installed on the valve body, the upper portion of the valve rod slides in the valve cover, and a stuffing box component is arranged between the upper portion of the valve rod and the valve cover; the valve element slides in the sleeve, and a limiting sealing structure and a shaft hole sealing structure are arranged between the valve element and the sleeve. The black water regulating valve has the advantage of being simple in structure, the modular design concept is adopted, the annular multi-stage pressure reduction flow channel is introduced into the black water regulating valve, and the advantages of the flow channel structure are fully utilized. By means of the innovation, the valve shows more excellent performance in the aspects of pressure reduction, speed reduction, noise reduction, scouring resistance and the like, and meanwhile better adjusting precision and stability are achieved. Under the severe working condition of a medium rich in particles, the valve can stably and efficiently operate for a long time, and a series of problems of an existing valve under similar working conditions are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of control valves and relates to a black water multi-stage pressure reducing control valve. Background Art

[0002] Black water control valves are mainly used in the coal chemical industry, such as in gasification units. Specific application locations include from the bottom of the gasifier to the high-pressure flash tank and from the bottom of the scrubber to the high-pressure flash tank, etc. In addition, black water control valves may also be used in some other occasions where the working conditions of a few other media are relatively harsh. Since the black water medium contains a large amount of solid particles, corrosive substances and has a relatively high temperature and pressure, ordinary control valves are easily washed and damaged, it is difficult to cut off tightly, and impurities are also likely to accumulate inside the valve. Summary of the Invention

[0003] The purpose of the present invention is to provide a black water multi-stage pressure reducing control valve, which can solve the above problems and has better regulation accuracy and stability.

[0004] Through special design, the present invention ensures that the valve can maintain good sealing performance under high pressure and medium conditions containing solid particles. The valve internals adopt special shapes and surface treatments to reduce fluid resistance and wear, and can withstand the erosion and corrosion of the medium. The service life of the valve is extended, and the reliability of the system is improved.

[0005] According to the technical solution provided by the present invention: a black water multi-stage pressure reducing control valve includes a valve body and a valve stem. A valve body inlet and a sleeve are provided in the valve body and are connected and communicated. A valve cover and a diversion pipe are installed on the valve body. The upper part of the valve stem slides in the valve cover and a stuffing box component is provided between them. The lower part of the valve stem is sleeved with a valve core. The valve core slides in the sleeve and a limit sealing structure and a shaft hole sealing structure are provided between them. The diversion pipe is connected and communicated with the sleeve; a sleeve cavity is provided in the sleeve. The top of the sleeve cavity is a sealing inclined wall, and several sealing holes are provided in the sleeve cavity; a sealing inclined surface is provided on the upper part of the valve core, and several sealing shaft surfaces are provided on the lower part of the valve core.

[0006] As a further improvement of the present invention, the sealing inclined wall is in contact with the sealing inclined surface to form a limit sealing structure.

[0007] As a further improvement of the present invention, the taper angles of the sealing inclined wall and the sealing inclined surface are different to form a line seal.

[0008] As a further improvement of the present invention, the sealing holes are transitioned by an arc-shaped cavity wall, and the sealing shaft surfaces, the sealing inclined surfaces and between the sealing shaft surfaces are transitioned by an arc-shaped shaft surface.

[0009] As a further improvement of the present invention, a medium outlet is provided in the diversion pipe, and the medium outlet is arranged at 90 degrees to the valve body inlet.

[0010] As a further improvement of the present invention, the bottom of the stuffing box component is a wiper blade.

[0011] As a further improvement of the present invention, the wiper blade and the upper part of the valve stem are in clearance fit.

[0012] As a further improvement of the present invention, the upper part of the guide pipe is a flange structure. The upper part of the guide pipe flange is embedded in the bottom of the sleeve. A pressing plate is installed on the valve body, and the pressing plate abuts against the bottom of the guide pipe flange.

[0013] As a further improvement of the present invention, sealing rings are provided between the valve body and the valve cover, between the outer wall of the sleeve and the valve body, and between the bottom of the sleeve and the pressing plate.

[0014] The positive and progressive effects of this application are as follows: The present invention has the characteristics of simple structure. Adopting the modular design concept, the annular multi-stage pressure-reducing flow channel is introduced into the black water control valve, making full use of the advantages of the flow channel structure. This innovation enables the valve to exhibit more excellent performance in aspects such as pressure reduction, speed reduction, noise reduction, and erosion resistance, and at the same time has better adjustment accuracy and stability. Under the harsh working conditions of rich particle medium, the valve of the present invention can operate stably and efficiently for a long time, effectively overcoming a series of problems existing in the existing valves under similar working conditions. Brief Description of the Drawings

[0015] Figure 1 It is a cross-sectional view of the present invention.

[0016] Figure 2 It is a flow channel diagram composed of the valve stem and the sleeve. Detailed Embodiment

[0017] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0018] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present invention described herein. In addition, similar terms such as "comprising" and "having" mean that in addition to the contents already listed in "comprising" and "having", other contents not yet listed can also be "comprised" and "had"; for example, a process, method, system, product or device that may include a series of steps or units does not have to be limited to the clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] Due to the drawing angle problem, some components may not be drawn, but their positions and connection relationships can be understood according to the text description part.

[0021] As Figure 1 shown, the present invention is a multi-stage pressure-reducing regulating valve for black water, comprising a valve body 1 and a valve stem 5. A valve body inlet 1-1 and a sleeve 3 are provided in the valve body 1 and are connected and communicated. A valve cover 2 and a diversion pipe 6 are installed on the valve body 1. The upper part of the valve stem 5 slides in the valve cover 2 and a stuffing box component 10 is provided between the two. The lower part of the valve stem 5 is sleeved with a valve core 4. The valve core 4 slides in the sleeve 3 and a limit sealing structure and a shaft hole sealing structure are provided between the two. The diversion pipe 6 is connected and communicated with the sleeve 3.

[0022] As Figure 2 shown, a sleeve cavity is provided in the sleeve 3. The top of the sleeve cavity is a sealing inclined wall 3-1, and several sealing holes 3-2 are provided in the sleeve cavity. This design reduces one valve seat part, not only effectively improves the reliability of the valve, but also reduces the production cost.

[0023] A sealing inclined surface 4-1 is provided on the upper part of the valve core 4, and several sealing shaft surfaces 4-2 are provided on the lower part of the valve core 4.

[0024] The sealing inclined wall 3-1 is in contact with the sealing inclined surface 4-1 to form a limit sealing structure; their taper angles are different to form a line seal. This design reduces the thrust requirement of the actuator and at the same time provides better sealing performance, further ensuring the sealing and reliability of the valve. The sealing holes 3-2 are adapted to the sealing shaft surfaces 4-2 to form a shaft hole sealing structure.

[0025] An arc-shaped cavity wall 3-3 is used for transition between the sealed holes, and an arc-shaped shaft surface 4-3 is used for transition between the sealed shaft surface 4-2, the sealed inclined surface 4-1, and between the sealed shaft surfaces 4-2. The arc surface has no sharp corners, and the sealed section is parallel to the flow direction, enabling the particles in the medium to pass through smoothly. This flow channel can effectively prevent residues from accumulating and piling up inside the valve, facilitating the maintenance of the smoothness of the internal flow channel of the valve, thereby preventing valve blockage and reducing failures caused by particle accumulation. At the same time, this flow channel design also avoids erosion of the throttling surface of the valve core 4, preventing the situation where the flow channel area increases and the valve opening decreases due to erosion, and thus ensuring the control accuracy of the valve. In addition, both the outside of the valve core 4 and the inside of the sleeve 3 are circular structures, which greatly facilitates the machining process, improves production efficiency, and reduces machining costs.

[0026] This embodiment adopts a 4-stage shaft-hole sealing structure to reduce the speed and pressure by increasing the number of pressure reduction stages, and to slow down the erosion of the valve core 4, the sleeve 3, and the guide pipe 6 by the fluid. In other embodiments, the number of shaft-hole seals can be flexibly set according to specific fluid working conditions requirements, so as to extend the service life of the valve core 4, the sleeve 3, and the guide pipe 6, and ensure the stable operation of the valve under complex working conditions.

[0027] The guide pipe 6 is provided with a medium outlet, and the medium outlet is set at 90 degrees to the valve body inlet 1-1. The internal flow channel of the valve body 1 is simple and has no dead ends, which is conducive to the smooth passage of the medium rich in particles, avoiding accumulation inside the valve, and further ensuring the normal operation of the valve.

[0028] The length of the guide pipe 6 is appropriately extended. The high-speed medium rich in particles passes through the medium outlet, which can effectively avoid erosion of the downstream pipeline, reduce the possibility of damage to the downstream pipeline due to medium impact, and extend the service life of the entire system.

[0029] The bottom of the stuffing box component 10 is a scraper 10-1, and the scraper 10-1 and the upper part of the valve stem 5 are in clearance fit, which can effectively prevent the particles in the medium from entering the stuffing box component 10, avoid scratching the valve stem 5 and damaging the stuffing box component 10, and thus prevent the valve external leakage problem caused by the damage of the stuffing box component 10.

[0030] The upper part of the guide pipe 6 is a flange structure. The upper part of the flange of the guide pipe 6 is embedded in the bottom of the sleeve 3, and a pressing plate 7 is installed on the valve body 1, and the pressing plate 7 abuts against the bottom of the flange of the guide pipe 6. This structural design not only facilitates the replacement of the guide pipe 6, but also, when necessary, facilitates the removal of valve internal parts such as the sleeve 3 and the valve core 4, greatly facilitating the later inspection, descaling, and replacement of valve internal parts of the valve, and reducing the maintenance difficulty and cost.

[0031] In order to ensure the sealing performance of the valve and reduce the impact on the environment and equipment caused by medium leakage.

[0032] Sealing rings 8 are provided between the valve body 1 and the valve cover 2, between the outer wall of the sleeve 3 and the valve body 1, and between the bottom of the sleeve 3 and the pressing plate 7.

[0033] The valve stem 5 is designed as a stepped shaft. This design improves the strength and service life of the valve stem 5, reduces the friction of the packing on the valve stem 5, and at the same time improves the sealing performance at the packing, ensuring the reliable operation of the valve.

[0034] Parts in contact with the medium such as the valve core 4, the sleeve 3, and the diversion pipe 6 are made of high-hardness erosion-resistant and wear-resistant materials and treatment methods, which can effectively solve problems such as flashing, particle erosion, and cavitation, greatly improving the service life of the valve internals and reducing the maintenance and replacement frequency caused by component damage.

[0035] The valve core 4 and the valve stem 5 adopt a separated design, and materials with different characteristics can be selected. The valve stem has the characteristics of high strength, resistance to compression, bending, and toughness, while the valve core has the characteristics of high hardness, erosion resistance, and wear resistance. The two are convenient to replace, and are connected by welding or pins, with high reliability, and can effectively prevent problems such as vortex and resonance fracture.

[0036] The working process of the present invention is as follows: The valve consists of main parts such as the valve body 1, the valve cover 2, the sleeve 3, multiple sections of the valve core 4, the valve stem 5, the diversion pipe 6, the pressing plate 7, the sealing member 8, and the stuffing box assembly 10, as well as bolts and nuts. Strictly control its dimensional accuracy and surface quality. During the assembly process, ensure that the connection between the valve stem 5 and the valve core 4 is firm and the movement is flexible. Install the valve core 4 accurately in the sleeve 3 so that their cooperation meets the design requirements. Assemble each component into a complete valve through bolts and nuts. The actuator drives the valve stem 5 and the valve core 4 to perform linear motion, opening and closing the valve to adjust the pressure difference and flow rate.

[0037] When the valve stem 5 moves upward, it drives the valve core 4 to move upward. The sealing surface of the valve core 4 separates from the mating surface of the sleeve 3, and the valve opens. The opening size is determined according to needs. After the valve opens, the medium flows out of the valve along the multi-stage bent flow path formed by the outer circle of the valve core 4 and the inner wall of the sleeve 3. The medium flows into the downstream of the valve through the diversion pipe 6.

[0038] The mating dimensions between each section of the valve core 4 and the sleeve 3 can be designed differently to further control the flow rate and pressure drop of the fluid.

[0039] The flow capacity and pressure drop capacity of the valve can be determined by the number of pressure drop sections of the valve core 4 and the sleeve 3. The more the number of pressure drop sections, the stronger the pressure drop capacity. However, correspondingly, the flow capacity will be reduced and the flow rate will also decrease. This adjustable design enables the valve to adapt to the diverse requirements for pressure, flow rate, and flow velocity under different working conditions.

[0040] The valve is designed with a large stroke. Through this design, the adjustment accuracy of the valve can be improved, enabling it to more precisely control the flow rate and pressure of the medium and meet the usage requirements under different working conditions.

[0041] The overall structure of the valve is compact, and the flow channel is reasonably designed. On the premise of ensuring the valve performance, the materials for manufacturing the valve are saved, and the production cost is reduced.

[0042] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A black water multi-stage pressure-reducing regulating valve, comprising a valve body (1) and a valve stem (5), characterized in that: A valve body inlet (1-1) and a sleeve (3) are provided in the valve body (1), a valve cover (2) and a flow guide tube (6) are installed on the valve body (1), the upper part of the valve stem (5) slides in the valve cover (2), and a stuffing box component (10) is provided between the two, the lower part of the valve stem (5) is sleeved with a valve core (4), the valve core (4) slides in the sleeve (3), and a limit seal structure and an axial hole seal structure are provided between the two, and the flow guide tube (6) is connected to the sleeve (3); a sleeve cavity is provided in the sleeve (3), the top of the sleeve cavity is a sealing inclined wall (3-1), and a plurality of sealing holes (3-2) are provided in the sleeve cavity; a sealing inclined surface (4-1) is provided on the upper part of the valve core (4), and a plurality of sealing axial surfaces (4-2) are provided on the lower part of the valve core (4).

2. The black water multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The sealing inclined wall (3-1) contacts the sealing inclined surface (4-1) to form a position-limiting sealing structure.

3. The black water multi-stage pressure reduction regulating valve according to claim 2, characterized in that: The sealing inclined wall (3-1) and the sealing inclined surface (4-1) have different taper angles, thereby forming a line seal.

4. The black water multi-stage pressure reduction regulating valve according to claim 1, characterized in that: The sealing holes are transitioned by arc-shaped cavity walls (3-3), and the sealing shaft surface (4-2) and the sealing inclined surface (4-1) as well as the sealing shaft surface (4-2) are transitioned by arc-shaped shaft surfaces (4-3).

5. The black water multi-stage pressure reducing regulating valve according to claim 1, characterized in that: A medium outlet is provided in the flow guide pipe (6), and the medium outlet is arranged at 90 degrees to the valve body inlet (1-1).

6. The black water multi-stage pressure reduction regulating valve according to claim 1, characterized in that: The bottom of the stuffing box component (10) is a scraper (10-1).

7. The black water multi-stage pressure reduction regulating valve according to claim 6, characterized in that: The scraper (10-1) and the upper part of the valve stem (5) are clearance-fitted.

8. The black water multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The upper part of the flow guide pipe (6) is a flange structure, the upper part of the flange of the flow guide pipe (6) is embedded in the bottom of the sleeve (3), and a pressure plate (7) is installed on the valve body (1), and the pressure plate (7) is pressed against the bottom of the flange of the flow guide pipe (6).

9. The black water multi-stage pressure reducing regulating valve according to claim 1, characterized in that: Sealing rings (8) are provided between the valve body (1) and the valve cover (2), between the outer wall of the sleeve (3) and the valve body (1), and between the bottom of the sleeve (3) and the pressure plate (7).

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