Flash evaporation regulating valve of dryer

Abstract

The utility model provides a flash evaporation regulating valve of a dryer, and belongs to the technical field of chemical production. The utility model provides a dryer flash evaporation regulating valve which comprises a valve internal part, a valve body sleeve, an installation sleeve and a dryer short section, the valve internal part comprises a flow guide sleeve, a valve rod, a corrugated pipe and a valve element, the valve rod is arranged in the flow guide sleeve in a penetrating mode, the flow guide sleeve is arranged in the valve body sleeve in a penetrating mode, and a discharging port facilitating discharging of tar is formed in the lower bottom face of the valve body sleeve. The dryer short section is arranged on the dryer and covers the outer side of a feeding port of the dryer, the installation sleeve is arranged on the dryer short section, and the lower end of the valve body sleeve sequentially penetrates through the installation sleeve and the dryer short section and penetrates into the dryer. According to the flash evaporation regulating valve of the dryer, the dryer short section is arranged, the contact area between the valve body sleeve and the dryer short section is small, friction force is small, and dismounting is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a flash regulating valve for a dryer. Background Art

[0002] The industrial production process for toluene diisocyanate (TDI) primarily involves the nitration, hydrogenation, and photogenation of toluene. Diaminotoluene (toluenediamine, TDA) is the raw material for the production of TDI, which in turn is the primary raw material for polyurethane production. The dryer is a key component of the photogenation system, extracting crude TDI from tar in the later stages. During the phosgenation reaction, ortho-TDA and tar generate residues that clog the equipment, impacting production. A dryer failure can shut down the entire plant, a key factor hindering its long-term operation. In actual production, the dryer's flash valve has a high failure rate and a short service life, impacting production. The flash valve is used for feeding the dryer. High-temperature tar is sprayed into the device through the flash valve for processing. The flash valve includes a valve body sleeve and valve trim. The valve trim is arranged in the valve body sleeve. The valve trim includes a valve stem, a bellows and a valve core. The front and rear side walls of the valve stem are provided with guide grooves. The lower end of the valve stem is provided with an installation groove. The installation groove runs through the guide grooves on the front and rear sides. The bellows is provided in the installation groove. The valve core is provided at the lower end of the bellows and runs through the lower end face of the installation groove. Tar is easy to crystallize and has high viscosity, which will cause the internal channel of the valve cavity of the flash valve to be blocked, or even completely blocked, resulting in failure of the flash valve adjustment and damage to the bellows of the flash valve core. After the flash valve body sleeve is inserted into the feed nipple of the dryer, the flash valve body sleeve and the feed nipple will expand due to heat, resulting in squeezing and locking between the two. The friction is too large, making the flash valve difficult to disassemble. After the flash valve is blocked, the valve internals need to be baked at high temperature. Only after the internal tar is baked into a carbon ash state can the flash valve be disassembled and the valve internals can be cleaned. However, high-temperature baking will cause deformation of the valve internals and deterioration of the material. The disassembly process can easily cause damage to the flash valve (flange deformation, tearing of flange welds, etc.), causing the flash valve to be scrapped and unusable, greatly shortening the service life of the flash valve. Utility Model Content

[0003] The utility model aims to provide a flash evaporation regulating valve for a dryer, aiming to solve the problem that the flash evaporation valve is difficult to disassemble.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a dryer flash regulating valve, including a valve trim, a valve body sleeve, a mounting sleeve and a dryer short section, the valve trim including a guide sleeve, a valve stem, a bellows and a valve core, the valve stem is inserted into the guide sleeve, the guide sleeve is inserted into the valve body sleeve, a discharge port for facilitating the discharge of tar is provided on the lower bottom surface of the valve body sleeve, the dryer short section is arranged on the dryer, and the cover is arranged on the outside of the feed port of the dryer, the mounting sleeve is arranged on the dryer short section, and the lower end of the valve body sleeve sequentially passes through the mounting sleeve and the dryer short section and penetrates into the dryer.

[0005] In a possible implementation, the bellows is provided on the lower end surface of the valve stem, and the bellows is located below the guide sleeve.

[0006] In a possible implementation, flow guide surfaces are provided on both the front and rear side walls of the flow guide sleeve.

[0007] In a possible implementation, an installation gap is provided between the outer side wall of the valve body sleeve and the inner side wall of the dryer nipple.

[0008] In a possible implementation, the width of the installation gap is between 4 and 5.5 mm.

[0009] In a possible implementation, a valve base is provided at the lower end opening of the valve body sleeve, a valve seat is provided at the lower end of the valve base, and the discharge port is provided on the valve seat.

[0010] In a possible implementation, a guide slope is provided at the lower end of the inner side wall of the valve base, and the distance between the guide slopes gradually decreases as the distance approaches the discharge port.

[0011] In a possible implementation, the inner diameter of the mounting sleeve is larger than the inner diameter of the dryer nipple.

[0012] In one possible implementation, a short section mounting flange is provided at the upper end of the dryer short section, the lower end of the mounting sleeve is provided on the short section mounting flange, a sleeve flange is provided at the upper end of the valve body sleeve, and the lower end face of the sleeve flange is provided on the upper end face of the mounting sleeve.

[0013] In a possible implementation, the width of the widest part of the cross section of the guide sleeve is smaller than the inner diameter of the valve body sleeve.

[0014] The beneficial effects of the flash evaporation regulating valve for a dryer provided by the utility model are:

[0015] Compared with the prior art, a valve trim, a valve body sleeve, an installation sleeve and a dryer short section are provided. The valve trim includes a guide sleeve, a valve stem, a bellows and a valve core. The valve stem is arranged in the guide sleeve, and the guide sleeve is inserted into the valve body sleeve. A discharge port is provided on the lower bottom surface of the valve body sleeve, and tar is discharged from the discharge port. A dryer short section is provided outside the feed port of the dryer, and the dryer short section is arranged on the outer wall of the dryer. The installation sleeve is provided on the dryer short section. The lower end of the valve body sleeve penetrates into the installation sleeve and the dryer short section from top to bottom, and the lower end of the valve body sleeve is located in the dryer. When disassembling, the valve body sleeve and the installation sleeve can be removed from the dryer short section. The contact area between the valve body sleeve and the dryer short section is small, and the friction is small, which reduces the difficulty of disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the internal structure of a flash regulating valve for a dryer provided in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the guide sleeve used in an embodiment of the present utility model.

[0019] In the figure: 1. Valve stem; 2. Guide surface; 3. Guide sleeve; 4. Bellows; 5. Valve base; 6. Valve core; 7. Valve body sleeve; 8. Sleeve flange; 9. Guide slope; 10. Feed port; 11. Lifting flange; 12. Mounting sleeve; 13. Short section mounting flange; 14. Dryer short section; 15. Dryer; 16. Valve seat. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Please refer to Figure 1Now, a specific embodiment of a dryer flash regulating valve provided by the utility model is described, including a valve trim, a valve body sleeve 7, a mounting sleeve 12 and a dryer short section 14. The valve trim includes a guide sleeve 3, a valve stem 1, a bellows 4 and a valve core 6. The valve stem 1 is inserted into the guide sleeve 3, and the guide sleeve 3 is inserted into the valve body sleeve 7. A discharge port 10 is provided on the lower bottom surface of the valve body sleeve 7 for facilitating the discharge of tar. The dryer short section 14 is provided on the dryer 15, and the cover is provided on the outside of the feed port of the dryer 15. The mounting sleeve 12 is provided in the dryer short section 14. The lower end of the valve body sleeve 7 sequentially penetrates the mounting sleeve 12 and the dryer short section 14 and penetrates into the dryer 15.

[0022] The utility model provides a dryer flash regulating valve. Compared with the prior art, it is provided with a valve trim, a valve body sleeve 7, a mounting sleeve 12 and a dryer short section 14. The valve trim includes a guide sleeve 3, a valve stem 1, a bellows 4 and a valve core 6. The valve stem 1 is arranged in the guide sleeve 3, and the guide sleeve 3 is passed through the valve body sleeve 7. A discharge port 10 is provided on the lower bottom surface of the valve body sleeve 7. Tar is discharged from the discharge port 10. A dryer short section 1 is provided on the outside of the feed port of the dryer 15. 4. The dryer nipple 14 is arranged on the outer wall of the dryer 15, and the mounting sleeve 12 is arranged on the dryer nipple 14. The lower end of the valve body sleeve 7 penetrates the mounting sleeve 12 and the dryer nipple 14 from top to bottom. The lower end of the valve body sleeve 7 is located in the dryer 15. When disassembling, the valve body sleeve 7 and the mounting sleeve 12 can be removed from the dryer nipple 14. The contact area between the valve body sleeve 7 and the dryer nipple 14 is small, the friction is small, and the difficulty of disassembly is reduced.

[0023] For details, please refer to Figure 1, including valve trim, valve body sleeve 7, installation sleeve 12 and dryer short section 14, valve trim includes guide sleeve 3, valve stem 1, bellows 4 and valve core 6, valve trim is passed through the guide sleeve 3, guide sleeve 3 is passed through the valve body sleeve 7, the upper end of the guide sleeve 3 is provided with a feed piece, the feed piece is provided with a feed port and a discharge port, the feed port and the discharge port are arranged oppositely, and are respectively arranged on the front and rear sides of the feed piece, a discharge port 10 is provided on the lower bottom surface of the valve body sleeve 7, tar is discharged from the discharge port 10, the height of the valve core 6 is controlled, the valve core 6 is inserted into the discharge port 10 to prevent tar from being discharged, the valve core 6 is opened upward, and the opening of the regulating valve is adjusted. Size, tar is discharged from the discharge port 10, the dryer short section 14 is arranged on the outer side wall of the dryer 15, the dryer short section 14 is arranged upward, the lower end of the dryer short section 14 is located on the outside of the feed port of the dryer 15, the mounting sleeve 12 is arranged in the dryer short section, the lower end of the valve body sleeve 7 sequentially passes through the mounting sleeve 12 and the dryer short section 14, the lower end of the valve body sleeve 7 and the lower end of the valve core 6 are both located in the dryer 15, when disassembling, the valve body sleeve 7 and the mounting sleeve 12 can be removed from the dryer short section 144, the contact area between the valve body sleeve 7 and the dryer short section 14 is small, the friction is small, and the difficulty of disassembly is reduced.

[0024] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 The bellows 4 is arranged on the lower end surface of the valve stem 1 , and the bellows 4 is located below the guide sleeve 3 .

[0025] For details, please refer to Figure 1 A bellows 4 is provided on the lower end face of the valve stem 1, the lower end of the valve stem 1 passes through the guide sleeve 3 and the bellows 4, the valve stem 1 is welded to the lower end of the bellows 4, the upper end of the bellows 4 is welded to the lower end face of the guide sleeve 3, and the lower end of the valve stem 1 is threadedly connected to the valve core 6 to prevent tar accumulation and crystallization, which may cause blockage of the flow channel in the valve body sleeve 7 and damage to the regulating valve.

[0026] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 as well as Figure 2 , guide surfaces 2 are provided on the front and rear side walls of the guide sleeve 3.

[0027] For details, please refer to Figure 1 as well as Figure 2A guide surface 2 is provided on the guide sleeve 3, and the guide surface 2 is arranged from top to bottom along the length direction of the guide sleeve 3. Guide surfaces 2 are provided on the front side wall and the rear side wall of the guide sleeve 3. The feed port on the front side wall of the feed piece is connected to the space in front of the guide surface 2 of the front side wall of the guide sleeve 3, which is convenient for the tar to flow into the valve body sleeve 7 along the front guide surface 2. The discharge port on the rear side wall of the feed piece is connected to the space behind the guide surface 2 of the rear side wall of the guide sleeve 3, which is convenient for the outflow of the tar in the valve body sleeve 7 and flows out of the valve body sleeve 7 along the rear guide surface 2, which is convenient for the flow of tar and avoids the accumulation and crystallization of tar, which causes the flow channel in the valve body sleeve 7 to be blocked and the regulating valve to be damaged.

[0028] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 An installation gap is provided between the outer side wall of the valve body sleeve 7 and the inner side wall of the dryer short section 14 .

[0029] For details, please refer to Figure 1 The valve body sleeve 7 and the dryer short section 14 are clearance-matched, and an installation gap is set between the two to facilitate the separation of the valve body sleeve 7 and the dryer short section 14, and to facilitate the disassembly of the valve body sleeve 7, thereby avoiding damage to the valve body sleeve 7 during the disassembly process.

[0030] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 , the width of the installation gap is between 4 and 5.5 mm.

[0031] For details, please refer to Figure 1 The width of the installation gap is between 4 and 5.5 mm. If the installation gap is too small, the valve body sleeve 7 is difficult to disassemble. If the installation gap is too large, the stability of the device is reduced.

[0032] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 A valve base 5 is provided at the lower end opening of the valve body sleeve 7 , a valve seat 16 is provided at the lower end of the valve base 5 , and the discharge port 10 is provided on the valve seat 16 .

[0033] For details, please refer to Figure 1 The valve base 5 is arranged at the lower end opening of the valve body sleeve 7, the valve seat 16 is arranged at the lower end of the valve base 5, and the discharge port 10 is arranged through the upper and lower end surfaces of the valve seat 16 to facilitate the discharge of tar.

[0034] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 The lower end of the inner side wall of the valve base 5 is provided with a guide inclined surface 9, and the distance between the guide inclined surfaces 9 gradually decreases as it approaches the discharge port 10.

[0035] For details, please refer to Figure 1 The inner wall of the valve base 5 is provided with a guide slope 9, which is provided on the inner wall of the valve base 5. The guide slope 9 is gradually inclined from top to bottom toward the axis of the valve base 5, so as to facilitate the flow and discharge of tar and avoid tar accumulation and clogging of the valve seat 16.

[0036] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 , the inner diameter of the mounting sleeve 12 is larger than the inner diameter of the dryer nipple 14 .

[0037] For details, please refer to Figure 1 The inner diameter of the mounting sleeve 12 is larger than the inner diameter of the dryer nipple 14 , which facilitates the installation of the valve body sleeve 7 .

[0038] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 The upper end of the dryer pup joint 14 is provided with a pup joint mounting flange 13, the lower end of the mounting sleeve 12 is provided on the pup joint mounting flange 13, the upper end of the valve body sleeve 7 is provided with a sleeve flange 8, and the lower end surface of the sleeve flange 8 is provided on the upper end surface of the mounting sleeve 12.

[0039] For details, please refer to Figure 1 The short section mounting flange 13 is arranged at the upper end of the dryer short section 14, the mounting sleeve 12 is arranged on the short section mounting flange 13, the sleeve flange 8 is arranged at the upper end of the valve body sleeve 7, and the lower end face of the sleeve flange 8 is provided with a lifting flange 11. The diameter of the lifting flange 11 is larger than the diameter of the sleeve flange 8. The upper end face of the lifting flange 11 is provided with a lifting ring for facilitating lifting. After the valve body sleeve 7 is installed, a stabilizing rod is provided between the sleeve flange 8 and the short section mounting flange 13. The stabilizing rod passes through the sleeve flange 8, the lifting flange 11 and the short section mounting flange 13 to increase the stability of the installation.

[0040] As a specific embodiment of the flash evaporation regulating valve for dryers provided by the present invention, please refer to Figure 1 as well as Figure 2 The width of the widest part of the cross section of the guide sleeve 3 is smaller than the inner diameter of the valve body sleeve 7 .

[0041] For details, please refer to Figure 1 as well as Figure 2 The widest part of the guide sleeve 3 is matched with the inner wall clearance of the valve body sleeve 7, and the matching clearance between the two is between 0.3 and 0.8 mm, which is convenient for the installation of the guide sleeve 3.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flash control valve for a dryer, characterized in that: It includes valve trim, valve body sleeve, installation sleeve and dryer short section, the valve trim includes guide sleeve, valve stem, bellows and valve core, the valve stem is inserted in the guide sleeve, the guide sleeve is inserted in the valve body sleeve, the lower bottom surface of the valve body sleeve is provided with a discharge port for facilitating the discharge of tar, the dryer short section is arranged on the dryer, and the cover is arranged on the outside of the feed port of the dryer, the installation sleeve is arranged on the dryer short section, and the lower end of the valve body sleeve sequentially passes through the installation sleeve and the dryer short section and penetrates into the dryer.

2. A flash control valve for a dryer according to claim 1, characterized in that: The bellows is arranged on the lower end surface of the valve stem, and the bellows is located below the guide sleeve.

3. A flash control valve for a dryer according to claim 1, characterized in that: The front and rear side walls of the guide sleeve are both provided with guide surfaces.

4. A flash evaporation regulating valve for a dryer according to claim 1, characterized in that: An installation gap is provided between the outer side wall of the valve body sleeve and the inner side wall of the dryer nipple.

5. A flash control valve for a dryer as claimed in claim 4, characterized in that: The width of the installation gap is between 4 and 5.5 mm.

6. A flash evaporation regulating valve for a dryer according to claim 1, characterized in that: A valve base is provided at the lower end opening of the valve body sleeve, a valve seat is provided at the lower end of the valve base, and the discharge port is provided on the valve seat.

7. A flash evaporation regulating valve for a dryer according to claim 6, characterized in that: The lower end of the inner side wall of the valve base is provided with a guide inclined surface, and the distance between the guide inclined surfaces gradually decreases as it approaches the discharge port.

8. The flash control valve for a dryer according to claim 1, characterized in that: The inner diameter of the mounting sleeve is larger than the inner diameter of the dryer nipple.

9. A flash evaporation regulating valve for a dryer according to claim 1, characterized in that: The upper end of the dryer short section is provided with a short section mounting flange, the lower end of the mounting sleeve is provided on the short section mounting flange, the upper end of the valve body sleeve is provided with a sleeve flange, and the lower end surface of the sleeve flange is provided on the upper end surface of the mounting sleeve.

10. The flash control valve for a dryer according to claim 1, characterized in that: The width of the widest part of the cross section of the guide sleeve is smaller than the inner diameter of the valve body sleeve.

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