A wear-resistant and erosion-resistant pulverized coal flow regulating valve

Abstract

The present invention discloses a wear-resistant and erosion-resistant pulverized coal flow regulating valve. A driving arm is provided at the front end of the inlet flange, and the driving arm is inserted into the fluid passage of the middle flange. The inlet flange is provided with a counterbored blind hole for installing a wear-resistant cup lining at the fluid inlet. A plurality of diverging and radiating through holes are provided in the middle of the wear-resistant cup lining. The through holes sequentially penetrate the wear-resistant cup lining and the inlet flange and are internally provided with wear-resistant inclined pipes. A wear-resistant orifice plate is arranged in the fluid passage of the middle flange. A plurality of holes are provided in the wear-resistant orifice plate. The wear-resistant inclined pipes are arranged corresponding to the holes in the wear-resistant orifice plate. A driving arm wear-resistant sleeve is arranged on the inner side of the inner hole of the wear-resistant orifice plate. The driving arm wear-resistant sleeve is sleeved on the outer circle of the driving arm. A radial hole is provided at the front end of the driving arm wear-resistant sleeve. The valve core can slide back and forth in the driving arm. A wear-resistant valve seat is provided at the fluid outlet of the outlet flange. The wear-resistant valve seat cooperates with the valve core for throttling. The present invention can achieve multi-stage throttling and pressure reduction, effectively reduce the pulverized coal flow rate, reduce the erosion of the internal components of the regulating valve, and improve the service life of the whole valve.

Description

Technical Field

[0001] The present invention relates to the technical field of coal chemical gasification technology, and particularly relates to a regulating valve for regulating the flow rate in a dry pulverized coal system for gas transportation. Background Art

[0002] In the coal chemical gasification - pulverized coal pressurized gasification process, a regulating valve is required to control the flow rate of the dry pulverized coal entering the gasifier. Due to various reasons such as on-site construction, operation and maintenance, the medium at the position of the pulverized coal regulating valve often contains wire, welding rod, hard foreign objects shed from the equipment in front of the valve, etc., which easily causes problems such as valve jamming, blockage, damage to the wear-resistant coating or wear-resistant parts due to extrusion, and even damage to the sealing surface of the sealing pair, seriously affecting the use stability and service life of the pulverized coal flow regulating valve, and increasing the maintenance frequency and maintenance cost. Secondly, when using a V-shaped wear-resistant ball valve at the position of the pulverized coal flow regulating valve, due to the high pressure difference and extremely high flow velocity of the gas transporting pulverized coal, the flow direction in the flow channel of the V-shaped ball valve changes at least twice significantly, resulting in extremely strong erosion of the sealing pair and the inner cavity of the valve body. A valve body penetration and external leakage accident may occur within just a few months. Summary of the Invention

[0003] The purpose of the present invention is to provide a wear-resistant and erosion-resistant pulverized coal flow regulating valve to solve the above problems existing in the prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A wear-resistant and erosion-resistant pulverized coal flow regulating valve of the present invention includes a valve core and an inlet flange, a middle flange, and an outlet flange connected in sequence. A fluid inlet is provided on the inlet flange, a fluid channel is provided on the middle flange, and a fluid outlet is provided on the outlet flange. A driving arm is provided at the front end of the inlet flange, and the driving arm is inserted into the fluid channel of the middle flange. A counterbore for installing a wear-resistant cup lining is provided at the fluid inlet of the inlet flange. The wear-resistant cup lining is in the shape of a water cup, and a plurality of diverging and radiating through holes are provided in the middle of the wear-resistant cup lining. The through holes penetrate through the wear-resistant cup lining and the inlet flange in sequence and are internally provided with wear-resistant inclined pipes. A wear-resistant orifice plate is arranged in the fluid channel of the middle flange. A plurality of holes are provided on the wear-resistant orifice plate. The wear-resistant inclined pipes are arranged in one-to-one correspondence with the holes on the wear-resistant orifice plate. A driving arm wear-resistant sleeve is arranged on the inner side of the inner hole of the wear-resistant orifice plate. The driving arm wear-resistant sleeve is sleeved on the outer circle of the driving arm. A radial hole is provided at the front end of the driving arm wear-resistant sleeve. The radial hole is respectively communicated with the holes on the wear-resistant orifice plate and the fluid outlet. The valve core is arranged in the driving arm and can slide back and forth in the driving arm. A wear-resistant valve seat is provided at the fluid outlet of the outlet flange. The wear-resistant valve seat cooperates with the valve core for throttling.

[0006] Further, the sealing surface of the head of the valve core and the inner wall sealing surface of the wear-resistant valve seat form a sealing pair.

[0007] Further, a wear-resistant pipe is provided on the inner wall of the fluid passage of the middle flange. The wear-resistant pipes are arranged at intervals in the front-back direction with the wear-resistant orifice plate. A first end face is provided at the rear side of the outlet flange. The end face of the foremost wear-resistant pipe is flush with the first end face. A wear-resistant chassis is provided on the first end face. The other end face of the wear-resistant chassis is attached to the second end face on the front side of the driving arm wear-resistant sleeve. The inner hole of the wear-resistant chassis is sleeved on the outer circle of the wear-resistant valve seat.

[0008] Further, a vertical hole perpendicular to the axis of the fluid direction is provided on the outer circle of the middle flange. The vertical hole projects inwards and respectively cuts through and forms a first vertical perforation and a second vertical perforation on the wear-resistant pipe and the driving arm wear-resistant sleeve. The vertical hole continues to project inwards on the outer circle of the driving arm and forms a sealing platform. After the vertical hole reduces the projected outer circle, it penetrates through the wall thickness of the driving arm. A valve cover in the shape of a T-shaped round pipe is installed on the vertical hole. The sealing end of the valve cover sequentially passes through the first vertical perforation and the second vertical perforation until it reaches the wall thickness of the driving arm to form a seal with the sealing platform.

[0009] Still further, an inner hole is provided at the center of the valve cover. A rotatable gear rod is fitted in the inner hole. A gear is provided at the bottom of the gear rod and extends into the deep hole. A deep hole not communicating with the counterbore is provided on the front end face of the driving arm facing the rear side. A rack sleeve is installed in the deep hole. The outer circle of the rack sleeve is slidably fitted with the inner hole of the deep hole. A rectangular hole is cut in the abdomen of the rack sleeve. A rack is provided on the longer side of the rectangular hole. The rack is meshed with the gear to form a gear-rack matching structure in which the rotation of the gear rod can drive the translation of the rack sleeve. The rack sleeve is connected to the valve core.

[0010] Further, the rack sleeve and the valve core are an integral rack valve core.

[0011] Still further, an internal thread is provided at the orifice of the deep hole to install a driving arm end cover with an external thread. The inner hole of the driving arm end cover is slidably fitted with the valve core. Packing and a packing gland are provided inside the driving arm end cover. The inner hole of the packing is slidably fitted with the valve core. The packing gland is connected to the driving arm end cover by screws to compress the packing.

[0012] Further, the wear-resistant valve seat is a wear-resistant porous valve seat. The wear-resistant porous valve seat is provided with pores in the radial wall thickness, and the left end face is attached to the right end face of the packing gland. The pores are arranged in one-to-one correspondence with the radial holes.

[0013] Further, the spool, the wear-resistant cup liner, the wear-resistant inclined pipe, the wear-resistant orifice plate, the driving arm wear-resistant sleeve, the wear-resistant valve seat, the wear-resistant pipe, and the wear-resistant chassis are all made of wear-resistant cemented carbide, enamel, cast stone, or ceramic materials.

[0014] Further, the connection structure between the inlet flange, the middle flange, and the outlet flange is as follows: the middle flange and the outlet flange are of an integral structure, and then the structure of connecting the outlet flange through stud nuts, or the middle flange and the outlet flange are of a split valve body and a split flange connected through stud nuts, or the middle flange and the inlet flange are of an integral valve body, and then the structure of connecting a split flange through stud nuts.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] The wear-resistant and erosion-resistant pulverized coal flow regulating valve of the present invention is a regulating valve used for regulating the flow rate in the gas conveying dry pulverized coal system. By providing a water cup-shaped wear-resistant cup liner at the inlet, it can effectively collect foreign objects, and there is a flow field vortex at the bottom of the cup, which can quickly wash and break the foreign objects into small-sized foreign objects that do not affect the system operation. At the same time, by opening multiple holes in the flow channel components, it realizes multi-stage throttling and pressure reduction, effectively reducing the pulverized coal flow rate, reducing the erosion of the internal components of the regulating valve, and improving the service life of the entire valve. Moreover, the wear-resistant and erosion-resistant pulverized coal flow regulating valve of the present invention can be installed horizontally or directly vertically at the bottom of the pulverized coal lock hopper, with the advantages of flexible and convenient installation. It not only reduces the piping design difficulty of the system pipeline but also is more conducive to the smooth conveying of pulverized coal. It has obvious advantages for solving the working positions where V-type ball valves are widely used to regulate the pulverized coal flow rate but have a short service life. At the same time, for some angle-type pulverized coal flow regulating valves at the bottom of the pulverized coal lock head, by changing the angle valve to a 120° elbow and installing the regulating valve of the present invention in the straight pipe section after the elbow, replacement can also be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the drawings.

[0018] Figure 1 It is a front view structural schematic diagram of the wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 of the present invention in the fully open state;

[0019] Figure 2 It is a top view structural schematic diagram of the wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 of the present invention in the fully open state;

[0020] Figure 3 It is a partially sectional left view structural schematic diagram of the wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 of the present invention in the fully open state;

[0021] Figure 4Schematic diagram of the partial sectional axonometric structure of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 1 of the present invention in the fully open state;

[0022] Figure 5 Isometric structure diagram of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 1 of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 2 of the present invention in the fully open state;

[0024] Figure 7 Schematic diagram of the structure of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 3 of the present invention in the fully open state;

[0025] Figure 8 Schematic diagram of the structure of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 4 of the present invention in the fully open state;

[0026] Figure 9 Schematic diagram of the structure of the wear-resistant and erosion-resistant pulverized coal flow regulating valve according to Embodiment 5 of the present invention in the fully open state.

[0027] Explanation of reference numerals: 1, inlet flange; 2, outlet flange; 201, first end face; 202, wear-resistant porous valve seat; 2021, porous; 2022, left end face; 22, split flange; 3, wear-resistant cup lining; 31, integrated wear-resistant cup; 4, through hole; 5, wear-resistant inclined pipe; 6, valve core; 61, rack sleeve; 611, rack; 62, gear rod; 621, gear; 63, integrated rack valve core; 7, drive arm wear-resistant sleeve; 71, radial hole; 72, second end face; 73, second vertical through hole; 8, wear-resistant orifice plate; 9, middle flange; 90, wear-resistant pipe; 901, first vertical through hole; 91, valve cover; 92, inner hole; 93, vertical hole; 94, sealing end; 95, valve body; 10, wear-resistant chassis; 11, drive arm; 12, drive arm end cover; 121, packing; 122, packing gland; 13, counterbore; 14, sealing table; 15, deep hole; 16, integrated valve body; 17, wear-resistant valve seat. Detailed implementation manners

[0028] In order to make the objectives, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented 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 invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used in this article are only for the purpose of illustration, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The term "and / or" used in this article includes any and all combinations of one or more of the related listed items.

[0031] Embodiment 1

[0032] As Figures 1 to 5 shown, a wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 of the present invention includes a valve core 6 and an inlet flange 1, a middle flange 9, and an outlet flange 2 connected in sequence. A fluid inlet is provided on the inlet flange 1, a fluid passage is provided in the middle flange 9, a fluid outlet is provided on the outlet flange 2. A driving arm 11 is provided at the front end of the inlet flange 1, and the driving arm 11 is inserted into the fluid passage of the middle flange 9. A counterbore 13 for installing a wear-resistant cup lining 3 is provided at the fluid inlet of the inlet flange 1. The wear-resistant cup lining 3 is in the shape of a water cup. A plurality of diverging and radiating through holes 4 are provided at about the position of the cup waist in the middle of the wear-resistant cup lining 3. The through holes 4 penetrate through the wear-resistant cup lining 3 and the inlet flange 1 in sequence and a wear-resistant inclined pipe 5 is provided inside. A wear-resistant orifice plate 8 is arranged in the fluid passage of the middle flange 9. A plurality of holes are provided on the wear-resistant orifice plate 8. The wear-resistant inclined pipe 5 is arranged corresponding to the holes on the wear-resistant orifice plate 8 one by one. A driving arm wear-resistant sleeve 7 is arranged on the inner side of the inner hole of the wear-resistant orifice plate 8. The driving arm wear-resistant sleeve 7 is sleeved on the outer circle of the driving arm 11. A radial hole 71 is provided at the front end of the driving arm wear-resistant sleeve 7. The radial hole 71 is respectively communicated with the holes on the wear-resistant orifice plate 8 and the fluid outlet. The valve core 6 is arranged in the driving arm 11 and can slide back and forth in the driving arm 11. A wear-resistant valve seat 17 is provided at the fluid outlet of the outlet flange 2. The wear-resistant valve seat 17 cooperates with the valve core 6 for throttling.

[0033] The wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 is a regulating valve used to regulate the flow rate in a gas conveying dry pulverized coal system. By providing a water cup-shaped wear-resistant cup lining 3 at the inlet, foreign matters can be effectively collected, and there is a flow field vortex at the bottom of the cup, which can quickly wash and break the foreign matters into small-sized foreign matters that do not affect the system operation.

[0034] Among them, the head sealing surface of the valve core 6 and the inner wall sealing surface of the wear-resistant valve seat 17 form a sealing pair.

[0035] Specifically, a wear-resistant pipe 90 is provided on the inner wall of the fluid passage of the middle flange 9. The wear-resistant pipe 90 is arranged at intervals with the wear-resistant orifice plate 8 in the front-back direction. A first end face 201 is provided at the rear side of the outlet flange 2. The end face of the foremost wear-resistant pipe 90 is flush with the first end face 201. A wear-resistant bottom plate 10 is provided on the first end face 201. The other end face of the wear-resistant bottom plate 10 is attached to the front side second end face 72 of the driving arm wear-resistant sleeve 7. The inner hole of the wear-resistant bottom plate 10 is sleeved on the outer circle of the wear-resistant valve seat 17.

[0036] At this time, a vertical hole 93 perpendicular to the axis of the fluid direction is provided on the outer circle of the middle flange 9. The inner projection of the vertical hole 93 respectively penetrates and cuts out a first vertical perforation 901 and a second vertical perforation 73 on the wear-resistant pipe 90 and the driving arm wear-resistant sleeve 7. The inner projection of the vertical hole 93 continues to project onto the outer circle of the driving arm 11 and stops after cutting a certain depth, and a sealing platform 14 is formed. After the outer circle of the reduced projection of the vertical hole 93 penetrates the wall thickness of this side of the driving arm 11, a valve cover 91 in the shape of a T-shaped round pipe is installed on the vertical hole 93. The sealing end 94 of the thinner end of the valve cover 91 sequentially passes through the first vertical perforation 901 and the second vertical perforation 73 until it reaches the wall thickness of the driving arm 11 to form a seal with the sealing platform 14.

[0037] And, an inner hole 92 is provided at the center of the valve cover 91. A rotatable gear rod 62 is fitted in the inner hole 92. A gear 621 is provided at the bottom of the gear rod 62 and extends into the deep hole 15. A deep hole 15 not communicating with the counterbore 13 is provided on the front end face of the driving arm 11 facing the rear side. A rack sleeve 61 is installed in the deep hole 15. The outer circle of the rack sleeve 61 is slidably connected with the inner hole of the deep hole 15. A rectangular hole is cut out on the abdomen of the rack sleeve 61. A rack 611 is provided on the longer side in the rectangular hole. The rack 611 is meshed with the gear 621 to form a gear-rack matching structure in which the rotation of the gear rod 62 can drive the translation of the rack sleeve 61. The rack sleeve 61 is connected with the valve core 6.

[0038] Among them, the realization of the throttling function of the wear-resistant valve seat 17 and the valve core 6 is that the rotation of the gear rod 62 can drive the translation of the rack sleeve 61. Since the rack sleeve 61 is connected with the valve core 6, the valve core 6 can be driven to reciprocate back and forth in the driving arm 11. The gap between the head of the valve core 6 and the inner wall of the wear-resistant valve seat 20 changes, and the flow rate of the corresponding pulverized coal gas flow will be adjusted, such as Figure 2 、Figure 4 as shown

[0039] Specifically, an internal thread is provided at the orifice of the deep hole 15 for installing the drive arm end cover 12 with an external thread. The inner hole of the drive arm end cover 12 is slidably and cooperatively connected to the valve core 6. A packing 121 and a packing gland 122 are provided inside the drive arm end cover 12. The inner hole of the packing 121 is slidably and cooperatively connected to the valve core 6. The packing gland 122 is connected to the drive arm end cover 12 by screws to compress the packing 121.

[0040] Among them, the valve core 6, the wear-resistant cup liner 3, the wear-resistant inclined pipe 5, the wear-resistant orifice plate 8, the drive arm wear-resistant sleeve 7, the wear-resistant valve seat 17, the wear-resistant pipe 90 and the wear-resistant chassis 10 are all made of wear-resistant hard alloy, enamel, cast stone or ceramic materials.

[0041] At this time, the connection structure between the inlet flange 1, the middle flange 9 and the outlet flange 2 is as follows: the middle flange 9 and the outlet flange 2 are of an integral structure, and then the outlet flange 2 is connected by stud nuts.

[0042] When the wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 is in use, the flow path of the pulverized coal gas flow is first a large-sized circular cross-section of the fluid inlet on the inlet flange 1, and then it becomes several small circles through the multiple through holes 4 and the wear-resistant orifice plate 8 provided in the middle of the wear-resistant cup liner 3, and then becomes annular through the fluid channel of the middle flange 9. Among them, several wear-resistant orifice plates 8 are provided in the fluid channel of the middle flange 9, that is, it repeatedly switches between several small circles and annular flow path cross-sections forward until finally it becomes a circular cross-section and flows out of the fluid outlet of the outlet flange 2, forming a special flow path.

[0043] The wear-resistant and erosion-resistant pulverized coal flow regulating valve of Embodiment 1 realizes multi-stage throttling and pressure reduction by opening multiple holes on the flow path components, effectively reducing the pulverized coal flow velocity, reducing the erosion of the internal components of the regulating valve, and improving the service life of the entire valve.

[0044] Embodiment 2

[0045] As Figure 6 shown, the difference between Embodiment 2 and Embodiment 1 is that: the connection structure between the inlet flange 1, the middle flange 9 and the outlet flange 2 is: the middle flange 9 and the outlet flange 2 adopt the structure of a split valve body 95 and a split flange 22. At this time, the split valve body 95 is connected to the inlet flange 1 and the outlet flange 2 by stud nuts.

[0046] Embodiment 3

[0047] As Figure 7 shown, the difference between Embodiment 3 and Embodiment 1 is that: the connection structure between the inlet flange 1, the middle flange 9 and the outlet flange 2 is: the middle flange 9 and the inlet flange 1 are an integral valve body 16, and it is then connected to the split flange 22 by stud nuts.

[0048] Example 4

[0049] As Figure 8 shown, the difference between this Example 4 and Example 1 is that: the wear-resistant valve seat 17 is a wear-resistant porous valve seat 202. The wear-resistant porous valve seat 202 is provided with porous holes 2021 in the radial wall thickness, and the left end face 2022 is in contact with the right end face of the packing gland 122. The porous holes 2021 are arranged in one-to-one correspondence with the radial holes 71.

[0050] Example 5

[0051] As Figure 9 shown, the difference between this Example 5 and Example 1 is that: the rack sleeve 61 and the valve core 6 are an integral rack valve core 63; at the same time, the wear-resistant cup liner 3 is an integral wear-resistant cup 31 structure.

[0052] The wear-resistant and erosion-resistant pulverized coal flow regulating valve of the present invention can be installed horizontally or directly vertically at the bottom of the pulverized coal lock hopper, and has the advantages of flexible and convenient installation. It not only reduces the piping design difficulty of the system pipeline, but also is more conducive to the smooth transportation of pulverized coal. It has obvious advantages for solving the working positions where V-type ball valves are widely used to regulate the pulverized coal flow but have a short service life. At the same time, for some angle-type pulverized coal flow regulating valves at the bottom of the pulverized coal lock head, by changing the angle valve to a 120° elbow and installing the regulating valve of the present invention in the straight pipe section after the elbow, replacement can also be achieved.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0054] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A wear-resistant and erosion-resistant pulverized coal flow regulating valve, Characterized in that: It includes a valve core (6) and an inlet flange (1), a middle flange (9) and an outlet flange (2) connected in sequence. A fluid inlet is provided on the inlet flange (1), a fluid passage is provided on the middle flange (9), a fluid outlet is provided on the outlet flange (2). A driving arm (11) is provided at the front end of the inlet flange (1), and the driving arm (11) is inserted into the fluid passage of the middle flange (9). A counterbore (13) for installing a wear-resistant cup lining (3) is provided at the fluid inlet of the inlet flange (1). The wear-resistant cup lining (3) is in the shape of a water cup. A plurality of diverging and radiating through holes (4) are provided in the middle of the wear-resistant cup lining (3). The through holes (4) penetrate through the wear-resistant cup lining (3) and the inlet flange (1) in sequence and a wear-resistant inclined pipe (5) is arranged inside. A wear-resistant orifice plate (8) is arranged in the fluid passage of the middle flange (9). A plurality of holes are provided on the wear-resistant orifice plate (8). The wear-resistant inclined pipes (5) are arranged in one-to-one correspondence with the holes on the wear-resistant orifice plate (8). A driving arm wear-resistant sleeve (7) is arranged on the inner side of the inner hole of the wear-resistant orifice plate (8). The driving arm wear-resistant sleeve (7) is sleeved on the outer circle of the driving arm (11). A radial hole (71) is provided at the front end of the driving arm wear-resistant sleeve (7). The radial hole (71) is respectively communicated with the holes on the wear-resistant orifice plate (8) and the fluid outlet. The valve core (6) is arranged in the driving arm (11) and can slide back and forth in the driving arm (11). A wear-resistant valve seat (17) is provided at the fluid outlet of the outlet flange (2). The wear-resistant valve seat (17) cooperates with the valve core (6) for throttling.

2. A wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 1, Characterized in that: The sealing surface of the head of the valve core (6) and the inner wall sealing surface of the wear-resistant valve seat (17) form a sealing pair.

3. A wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 1, Characterized in that: A wear-resistant pipe (90) is provided on the inner wall of the fluid passage of the middle flange (9). The wear-resistant pipe (90) is arranged at intervals with the wear-resistant orifice plate (8) in the front-rear direction. A first end face (201) is provided at the rear side of the outlet flange (2). The end face of the foremost wear-resistant pipe (90) is flush with the first end face (201). A wear-resistant chassis (10) is provided on the first end face (201). The other end face of the wear-resistant chassis (10) is attached to the second end face (72) at the front side of the driving arm wear-resistant sleeve (7). The inner hole of the wear-resistant chassis (10) is sleeved on the outer circle of the wear-resistant valve seat (17).

4. A wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 3, Characterized in that: The middle flange (9) is provided with a vertical hole (93) on its outer circumference perpendicular to the axis of the fluid direction. The vertical hole (93) projects inwards and respectively cuts through and forms a first vertical perforation (901) and a second vertical perforation (73) on the wear-resistant pipe (90) and the driving arm wear-resistant sleeve (7). The vertical hole (93) continues to project inwards on the outer circumference of the driving arm (11) and forms a sealing platform (14). After the outer circle of the projected vertical hole (93) is reduced, it penetrates through the wall thickness of the driving arm (11). A valve cover (91) in the shape of a T-shaped round pipe is installed on the vertical hole (93). The sealing end (94) of the valve cover (91) sequentially passes through the first vertical perforation (901) and the second vertical perforation (73) until it reaches inside the wall thickness of the driving arm (11) to form a seal with the sealing platform (14).

5. The wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 4, characterized in that: an inner hole (92) is provided at the center of the valve cover (91), and a rotatable gear rod (62) is fitted in the inner hole (92). A deep hole (15) that is not communicated with the counterbore (13) is provided on the front end surface of the driving arm (11) facing the rear side. A gear (621) is provided at the bottom of the gear rod (62) and extends into the deep hole (15). A rack sleeve (61) is installed in the deep hole (15). The outer circumference of the rack sleeve (61) is slidably fitted and connected with the inner hole of the deep hole (15). A rectangular hole is cut on the abdomen of the rack sleeve (61). A rack (611) is provided on the longer side of the rectangular hole. The rack (611) is meshed and connected with the gear (621) to form a gear-rack matching structure in which the rotation of the gear rod (62) can drive the translation of the rack sleeve (61). The rack sleeve (61) is connected with the valve core (6).

6. The wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 5, characterized in that: the rack sleeve (61) and the valve core (6) are an integral rack valve core (63).

7. The wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 5, characterized in that: an internal thread is provided at the orifice of the deep hole (15) to install a driving arm end cover (12) with an external thread. The inner hole of the driving arm end cover (12) is slidably fitted and connected with the valve core (6). A packing (121) and a packing gland (122) are provided inside the driving arm end cover (12). The inner hole of the packing (121) is slidably fitted and connected with the valve core (6). The packing gland (122) is connected to the driving arm end cover (12) by screws to compress the packing (121).

8. The wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 7, characterized in that: the wear-resistant valve seat (17) is a wear-resistant porous valve seat (202). The wear-resistant porous valve seat (202) is provided with porous holes (2021) on its radial wall thickness, and the left end face (2022) is attached to the right end face of the packing gland (122). The porous holes (2021) are arranged in one-to-one correspondence with the radial holes (71).

9. A wear-resistant and erosion-resistant pulverized coal flow regulating valve according to claim 3, characterized in that: the valve core (6), the wear-resistant cup lining (3), the wear-resistant inclined pipe (5), the wear-resistant orifice plate (8), the driving arm wear-resistant sleeve (7), the wear-resistant valve seat (17), the wear-resistant pipe (90) and the wear-resistant chassis (10) are all made of wear-resistant hard alloy, enamel, cast stone or ceramic materials.

10. A wear-resistant and erosion-resistant pulverized coal flow regulating valve according to any one of claims 1-9, characterized in that: the connection structure between the inlet flange (1), the middle flange (9) and the outlet flange (2) is as follows: the middle flange (9) and the outlet flange (2) are of an integral structure, and then the structure of connecting the outlet flange (2) through stud nuts, or the middle flange (9) and the outlet flange (2) are of a split valve body (95) and a split flange (22) connected through stud nuts, or the middle flange (9) and the inlet flange (1) are of an integral valve body (16), and then the structure of connecting the split flange (22) through stud nuts.

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