Window type guide sleeve for pulverized coal regulating valve and pulverized coal regulating valve

Abstract

The utility model relates to the field of pulverized coal, in particular to a window type guide sleeve for a pulverized coal regulating valve and the pulverized coal regulating valve. The window type guide sleeve for the pulverized coal regulating valve comprises a guide sleeve body, the guide sleeve body is provided with a guide section and a window section in the axial direction, the guide section is used for being in sliding fit with a valve rod of the pulverized coal regulating valve, and at least one window penetrating through the window section in the axial direction is formed in the peripheral wall of the window section. The inner peripheral wall of the end, away from the guide section, of the window section is in a flaring shape in the direction away from the guide section. The window on the guide sleeve main body has the functions of balancing holes and discharging pulverized coal, so that the situation that the pulverized coal regulating valve is jammed due to the fact that pulverized coal particles are accumulated in the space of the valve cover is prevented.

Description

Technical Field

[0001] The utility model relates to the field of pulverized coal, in particular to a window type guide sleeve for a pulverized coal control valve and a pulverized coal control valve. Background Art

[0002] In the field of pulverized coal gasification, the pulverized coal control valve is crucial. The pulverized coal control valve is installed between the pulverized coal feeding tank and the gasifier burner, and is used to adjust the pulverized coal flow rate entering the gasifier. It is a key device for precisely controlling the oxygen-coal ratio of the gasifier, and its performance directly affects whether the gasifier can operate safely and stably for a long time. Most of the pulverized coal control valves are angle valve structures, also known as pulverized coal angle valves. By changing the cross-sectional area between the valve core and the valve seat, the flow rate of pulverized coal is changed.

[0003] The valve core is dragged by the valve rod, and the valve rod is slidably fitted in the guide sleeve. In order to achieve air pressure balance, the guide sleeve is provided with a plurality of axially extending balance holes along the circumferential direction. This kind of guide sleeve is called a balance hole type guide sleeve. For example, in the patent application with the application number 201910810455.2 and the patent name of a double-guide high-temperature molten salt control valve, this kind of guide sleeve structure is adopted.

[0004] For the pulverized coal control valve using this kind of guide sleeve structure, pulverized coal particles can easily enter the valve cover space through the balance holes of the guide sleeve, causing the valve rod to be blocked, resulting in the problem of valve jamming of the pulverized coal control valve. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a window type guide sleeve for a pulverized coal control valve. The window of the guide sleeve takes into account the functions of balance holes and discharging pulverized coal, thereby preventing the valve jamming of the pulverized coal control valve caused by the accumulation of pulverized coal particles in the valve cover space.

[0006] In order to solve the above technical problem, the technical solution of the utility model is: a window type guide sleeve for a pulverized coal control valve, including a guide sleeve body. The guide sleeve body is axially provided with a guide section and a window section. The guide section is used for sliding cooperation with the valve rod of the pulverized coal control valve. At least one window penetrating through it axially is opened on the peripheral wall of the window section. The inner peripheral wall of the end of the window section far from the guide section is flared in the direction away from the guide section.

[0007] Furthermore, in order to prevent the pulverized coal discharged from the window from falling back onto the guide sleeve body, the outer diameter of the window section is greater than the outer diameter of the guide section.

[0008] Further, the guide sleeve body further includes an extension section. The extension section is located at the end of the window section far from the guide section, and the inner diameter is the same as the maximum inner diameter of the window section.

[0009] Further, a guide groove is provided on the inner wall of the guide sleeve body.

[0010] Further, in order to improve the surface hardness of the guide sleeve, the surface of the guide sleeve body is a nitriding hardening treatment layer.

[0011] The utility model also relates to a pulverized coal control valve, which includes a window-type guide sleeve for the pulverized coal control valve.

[0012] Further, in order to enable purging, the pulverized coal control valve further includes:

[0013] A valve body having a pulverized coal inlet flow channel and a pulverized coal outlet flow channel that communicate with each other;

[0014] A valve cover installed on the valve body, the guide sleeve body is installed on the valve body and / or the valve cover, the flared portion faces the valve cover, the valve cover and the window-type guide sleeve jointly form an inner cavity, and the valve body and / or the valve cover are provided with a purging channel for purging the inner cavity;

[0015] A valve core assembly including a valve stem and a valve core head, the valve stem passes through the guide sleeve body and the valve cover; the valve core head is connected to the valve stem and is configured to move axially along the valve stem under the drive of the valve stem to adjust the opening degree of the pulverized coal outlet flow channel.

[0016] Further, in order to improve the erosion and abrasion resistance of the flow channel, the pulverized coal inlet flow channel and the pulverized coal outlet flow channel are sprayed with a tungsten carbide layer.

[0017] Further, in order to achieve a firm connection between the valve core head and the valve stem, the valve core head is connected to the valve stem through a connecting rod, the connecting rod passes through the valve core head and is threadedly connected to the valve stem, the end of the connecting rod away from the valve stem is conical, and the outer diameter becomes larger as it is farther away from the valve stem.

[0018] Further, in order to facilitate the rotation of the connecting rod, a screwing portion is provided at the end of the connecting rod away from the valve stem.

[0019] Further, in order to provide good buffering between the valve stem and the valve core head, the valve core head and the valve stem are in contact with each other, and a disc spring is provided between them.

[0020] Further, in order to prevent relative rotation between the connecting rod and the valve stem, a fixing pin penetrates through both the connecting rod and the valve stem.

[0021] Furthermore, the pulverized coal control valve further includes a sealing assembly, the sealing assembly includes a gland, a pressure ring and a packing filled between the valve stem and the valve cover, the gland presses the packing, the pressure ring is connected to the valve cover and presses the gland, and a disc spring is provided between the pressure ring and the gland.

[0022] After adopting the above technical solution, a window is opened on the side of the guiding sleeve body of the present utility model to replace the traditional balance hole. The window serves both the functions of balancing air pressure and discharging pulverized coal. The deposited pulverized coal can slide down along the flared part and be discharged from the window. The medium fluid can also flow in from the side window to wash away the deposited pulverized coal that has not been naturally discharged in the internal space of the guiding sleeve body. Therefore, the present utility model can effectively prevent valve jamming caused by pulverized coal deposition. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural view of the window-type guiding sleeve for the pulverized coal control valve of the present utility model;

[0024] Figure 2 It is a schematic structural view of the window-type guiding sleeve for the pulverized coal control valve of the present utility model from another perspective;

[0025] Figure 3 It is a cross-sectional view of the window-type guiding sleeve for the pulverized coal control valve of the present utility model;

[0026] Figure 4 It is a schematic structural view of the pulverized coal control valve of the present utility model;

[0027] Figure 5 is Figure 4 an enlarged view of part A;

[0028] In the figures, 1. guiding sleeve body; 11. guiding section; 12. window section; 121. window; 122. slope; 13. extension section; 14. guiding groove; 2. valve core assembly; 21. valve stem; 211. guiding key; 22. valve core head; 23. connecting rod; 231. screwing part; 24. fixing pin; 3. valve body; 31. pulverized coal inlet channel; 32. pulverized coal outlet channel; 33. outlet assembly; 331. outlet connecting pipe flange; 332. diffusion section; 333. valve seat; 334. valve seat bushing; 4. valve cover; 5. inner cavity; 6. purging channel; 7. disc spring; 8. sealing assembly; 81. gland; 82. retaining ring; 83. packing; 9. plugging assembly. Detailed Description of the Preferred Embodiments

[0029] In order to make the content of the present utility model be more clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0030] Embodiment 1

[0031] As Figures 1 to 5As shown in the figure, a window-type guide sleeve for a pulverized coal regulating valve includes a guide sleeve body 1. The guide sleeve body 1 is axially provided with a guide section 11 and a window section 12. The guide section 11 is used for sliding cooperation with the valve stem 21 of the pulverized coal regulating valve. At least one window 121 axially penetrating through the peripheral wall of the window section 12 is provided. The inner peripheral wall of the end of the window section 12 far from the guide section 11 is flared in the direction away from the guide section 11.

[0032] As Figures 2 to 5 shown in the figure, the inner peripheral wall of the end of the window section 12 far from the guide section 11 is a slope 122, thus forming a flared shape. The deposited pulverized coal slides down along the slope 122 and finally discharges from the window 121.

[0033] Specifically, in this embodiment, the traditional balance hole type guide sleeve is improved to a window type guide sleeve, taking into account the functions of balance holes and discharging pulverized coal. The window 121 can connect the side, bottom and internal space of the guide sleeve body 1. By setting the slope 122 on the inner peripheral wall of the end of the window section 12 far from the guide section 11, the deposited pulverized coal can effectively slide down along the slope 122 and finally discharge from the lower window 121. On the other hand, the medium fluid can flow in from the side window 121 to wash away the deposited pulverized coal that has not been naturally discharged in the internal space of the guide sleeve body 1.

[0034] In this embodiment, as Figures 1 to 5 shown in the figure, the guide sleeve body 1 may further include an extension section 13. The extension section 13 is located at the end of the window section 12 far from the guide section 11 and has the same size as the maximum size of the window section 12. The extension section 13 can increase the space around the valve stem 21 (the inner cavity 5 formed by the guide sleeve body 1 and the valve cover 4), making the valve stem 21 less likely to jam. In addition, a flanging edge is provided at the free end of the extension section 13, and the valve body 3 and the valve cover 4 jointly clamp the flanging edge to realize the assembly of the guide sleeve body 1 on the pulverized coal regulating valve.

[0035] Embodiment Two

[0036] On the basis of Embodiment One, as Figures 1 to 5 shown in the figure, the outer diameter of the window section 12 is larger than the outer diameter of the guide section 11. With this setting, it can be ensured that the window 121 extends outwards in the radial direction beyond the guide section 11, and the pulverized coal falling from the window 121 can directly fall outside the guide sleeve body 1, thus avoiding the pulverized coal falling from the window 121 from being deposited on the guide sleeve body 1 again. In this embodiment, the outer diameter of the window section 12 gradually increases from the end close to the guide section 11 to the end far from the guide section 11, and the window section 12 also plays a transitional role between the guide section 11 and the extension section 13.

[0037] Embodiment Three

[0038] On the basis of Embodiment One or Embodiment Two, as Figures 2 to 5As shown, a guide groove 14 is provided on the inner wall of the guide sleeve body 1. The valve stem 21 is provided with a guide key 211, and the guide key 211 cooperates with the guide groove 14 to provide good guidance for the up and down switching of the valve core assembly 2 and ensure the accuracy. In this embodiment, the guide groove 14 extends from the end of the guide section 11 away from the window section 13 to the small end of the flared structure.

[0039] Embodiment 4

[0040] Based on Embodiment 1 or Embodiment 2 or Embodiment 3, the surface of the guide sleeve body 1 is a nitrided hardening treatment layer. In this way, the surface hardness of the guide sleeve body 1 can be improved, effectively resisting erosion and wear.

[0041] Embodiment 5

[0042] As Figure 4 and Figure 5 shown, a pulverized coal control valve includes:

[0043] The window-type guide sleeve for the pulverized coal control valve in any one of Embodiments 1 to 4;

[0044] A valve body 3 having a mutually connected pulverized coal inlet flow channel 31 and a pulverized coal outlet flow channel 32;

[0045] A valve cover 4 is installed on the valve body 3. The guide sleeve body 1 of the window-type guide sleeve for the pulverized coal control valve is installed on the valve body 3 and / or the valve cover 4, and the flared part faces the valve cover 4. The valve cover 4 and the window-type guide sleeve together form an inner cavity 5;

[0046] A valve core assembly 2 includes a valve stem 21 and a valve core head 22. The valve stem 21 passes through the guide sleeve body 1 and the valve cover 4; the valve core head 22 is connected to the valve stem 21 and is configured to move axially along the valve stem 21 under the drive of the valve stem 21 to adjust the opening degree of the pulverized coal outlet flow channel 32;

[0047] A sealing assembly 8 includes a gland 81, a retaining ring 82 and a packing 83 filled between the valve stem 21 and the valve cover 4. The gland 81 presses the packing 83 tightly. The retaining ring 82 is connected to the valve cover 4 and presses the gland 81 tightly. A disc spring 7 is arranged between the retaining ring 82 and the gland 81.

[0048] In this embodiment, considering that pulverized coal particles have strong erosiveness and abrasiveness, in order to make the valve have good erosion resistance and wear resistance, hard alloys, tungsten carbide, etc. can be sprayed in the valve cavity and flow channels, and the valve cover 4 is designed as a long and high neck structure, etc.

[0049] In this embodiment, as Figure 4 and Figure 5 shown, an inverted-pull type valve core head 22 is adopted to improve the reliability of the use of the valve core head 22.

[0050] In this embodiment, the valve core head 22 is made of cemented carbide, which has higher hardness and better wear resistance; the valve stem 23 is made of high-strength alloy to prevent the risk of fracture.

[0051] In this embodiment, as Figure 4 and Figure 5 shown, the valve core head 22 is connected to the valve stem 21 through a connecting rod 23. After the connecting rod 23 passes through the valve core head 22, it is threadedly connected to the valve stem 21. The mating connection between the connecting rod 23 and the valve core head 22 and the valve stem 21 has high precision and high compatibility.

[0052] In this embodiment, as Figure 4 and Figure 5 shown, the valve core head 22 abuts against the valve stem 21, and a disc spring 7 is arranged between the two. The disc spring 7 can provide good buffering between the valve stem 21 and the valve core head 22, play a pre-tightening role, and avoid deformation and gaps caused by excessive force during the fitting and assembly of materials with different hardnesses.

[0053] In this embodiment, as Figure 4 and Figure 5 shown, the end of the connecting rod 23 far from the valve stem 21 is conical, and the outer diameter becomes larger as it is farther from the valve stem 21, which can effectively prevent the risk of the valve core head 22 falling off.

[0054] In this embodiment, as Figure 4 and Figure 5 shown, a screwing part 231 is arranged at the end of the connecting rod 23 far from the valve stem 21. Through the screwing part 231, the connecting rod 23 can be easily screwed, which is convenient for fixing and tightening when the connecting rod 23 and the valve stem 21 are threadedly connected. The screwing part 231 can be a hexagonal protrusion or the like.

[0055] In this embodiment, as Figure 4 and Figure 5 shown, a fixing pin 24 passes through the connecting rod 23 and the valve stem 21 at the same time. After using the fixing pin 24 to fix and tighten the connecting rod 23 and the valve stem 21, there will be no risk of rotation between the valve stem 21 and the connecting rod 23. In order to prevent the fixing pin 24 from falling off, spot welding is performed at both ends of the fixing pin 24 after drilling the fixing pin 24. Thus, each part of the valve core head component forms a safe, reliable, wear-resistant and erosion-resistant whole, and will not fall off or rotate. Among them, the fixing pin 24 can be but is not limited to a taper pin.

[0056] In this embodiment, as Figure 4As described above, an outlet assembly 33 is provided at the outlet of the valve body 3, and a pulverized coal outlet flow channel 32 is formed through the outlet assembly 33. The outlet assembly 33 includes a valve seat 333, a valve seat bushing 334, a diffuser section 332 and an outlet pipe flange 331. The valve seat 333 is installed on the inner peripheral wall at the outlet of the valve body 3, and the valve seat bushing 334 is installed on the inner peripheral wall of the valve seat 333. The valve core head 22 cooperates with the valve seat bushing 334 to adjust the opening of the pulverized coal outlet flow channel 32. The diffuser section 332 is docked with the valve seat bushing 334, and the outlet pipe flange 331 is docked with the valve seat 333. In addition, the outlet pipe flange 331 is installed on the valve body 3 by bolts, and also presses the diffuser section. In order to improve the sealing performance, a winding gasket is respectively provided between the diffuser section 332 and the valve seat bushing 334 and between the outlet pipe flange 331 and the valve seat 333.

[0057] The valve seat 333 and the diffuser 332 are made of cemented carbide, which has higher hardness and better wear resistance. The valve seat bushing 334 is clad with Ni60 on the inclined surface in contact with the medium, which effectively resists erosion and wear. The inner wall of the outlet pipe flange 331 and the inner wall of the reducing part are clad with Ni60, which has better wear resistance and erosion resistance.

[0058] In this embodiment, the packing 83 can be a low-emission type packing with better sealing performance. The gland 81 is designed with a disc spring 7 to provide a pre-tightening force during assembly. When the packing 83 is loose after being used for a long time, the disc spring 7 can also continue to give a certain pressure to the packing 83 to achieve continuous sealing of the packing 83.

[0059] Embodiment 6

[0060] On the basis of the fifth embodiment, as shown in FIG4 , the valve body 3 and / or the valve cover 4 is provided with a purge channel 6 for purging the inner cavity 5 .

[0061] Specifically, for the deposited pulverized coal that has not been flushed clean and naturally discharged in the inner cavity 5 and the pulverized coal that has entered the gap between the valve cover 4 and the valve stem 21, nitrogen can be used regularly to purge through the purge channel 6 according to actual usage, effectively preventing valve sticking caused by pulverized coal deposition.

[0062] In order to prevent the pulverized coal from leaking out of the purge channel 6 when the purge is not performed, Figure 4 As shown, a plugging assembly 9 is also provided at the outlet of the purge channel 6, and the plugging assembly 9 includes a flange and a flange cover, the flange is welded to the outlet of the purge channel 6, the flange cover and the flange are connected by studs, and a flange gasket is also provided between the flange cover and the flange. When the flange cover is opened, the purge gas can be blown into the purge channel 6 through the flange.

[0063] Based on the above inspiration from the ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A window-type guide sleeve for a pulverized coal regulating valve, comprising a guide sleeve body (1), characterized in that: The guide sleeve body (1) is provided with a guide section (11) and a window section (12) along the axial direction; the guide section (11) is used for slidingly cooperating with a valve stem (21) of a pulverized coal regulating valve; the peripheral wall of the window section (12) is provided with at least one window (121) penetrating the window section (12) in the axial direction; and the inner peripheral wall of the end of the window section (12) away from the guide section (11) is expanded in a direction away from the guide section (11).

2. The window-type guide sleeve for a pulverized coal regulating valve according to claim 1, characterized in that: The outer diameter of the window section (12) is greater than the outer diameter of the guide section (11).

3. The window-type guide sleeve for a pulverized coal regulating valve according to claim 1, characterized in that: The inner wall of the guide sleeve body (1) is provided with a guide groove (14).

4. The window-type guide sleeve for a pulverized coal regulating valve according to claim 1, characterized in that: The surface of the guide sleeve body (1) is a nitriding hardening treatment layer.

5. A pulverized coal regulating valve, characterized in that: It comprises a window-type guide sleeve for a pulverized coal regulating valve as described in any one of claims 1 to 4.

6. The pulverized coal regulating valve according to claim 5, characterized in that: Also includes: The valve body (3) has a pulverized coal inlet passage (31) and a pulverized coal outlet passage (32) which are interconnected; A valve cover (4) is mounted on the valve body (3); a guide sleeve body (1) is mounted on the valve body (3) and / or the valve cover (4), with the flared portion facing the valve cover (4); the valve cover (4) and the window-type guide sleeve together form an inner cavity (5); and the valve body (3) and / or the valve cover (4) are provided with a purge channel (6) for purging the inner cavity (5); A valve core assembly (2) comprises a valve stem (21) and a valve core head (22), wherein the valve stem (21) passes through a guide sleeve body (1) and the valve cover (4); the valve core head (22) is connected to the valve stem (21) and is configured to move along the axial direction of the valve stem (21) under the drive of the valve stem (21) to adjust the opening of the pulverized coal outlet flow channel (32).

7. The pulverized coal regulating valve according to claim 6, characterized in that: The pulverized coal inlet channel (31) and the pulverized coal outlet channel (32) are sprayed with a tungsten carbide layer.

8. The pulverized coal regulating valve according to claim 6, characterized in that: The valve core head (22) is connected to the valve stem (21) via a connecting rod (23). The connecting rod (23) passes through the valve core head (22) and is threadedly connected to the valve stem (21). The end of the connecting rod (23) away from the valve stem (21) is conical, and the farther away from the valve stem (21), the larger the outer diameter.

9. The pulverized coal regulating valve according to claim 8, characterized in that: The end of the connecting rod (23) away from the valve stem (21) is provided with a screwing portion (231); and / or the valve core head (22) and the valve stem (21) are against each other, and a disc spring (7) is arranged between the two; And / or the connecting rod (23) and the valve stem (21) are both penetrated by a fixing pin (24).

10. The pulverized coal regulating valve according to claim 6, characterized in that: The valve body also includes a sealing assembly (8), which includes a pressure cover (81), a pressure ring (82) and a packing (83) filled between the valve stem (21) and the valve cover (4), wherein the pressure cover (81) presses the packing (83), the pressure ring (82) is connected to the valve cover (4) and presses the pressure cover (81), and a disc spring (7) is arranged between the pressure ring (82) and the pressure cover (81).

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