Corrugated pipe upward expanding type angle valve for phosgene-containing medium

Abstract

The utility model relates to a corrugated pipe upward expanding type angle valve for phosgene-containing media. The valve body is provided with a first through opening and a second through opening which are communicated with each other; the valve seat is mounted at the first port of the valve body, the valve seat extends into and is mounted at an outlet channel of the reaction equipment, and a first sealing assembly is arranged between the valve seat and the outlet channel; the valve element assembly comprises a valve rod movably connected into the valve body in the axial direction and a valve element connected with the valve rod and capable of making sealing contact with the valve seat. The upper cover is installed at the end, away from the valve element, of the valve seat. The first end of the corrugated pipe is mounted on the upper cover, and the second end of the corrugated pipe is mounted on the valve rod; and the corrugated pipe protection sleeve is installed in the inner cavity of the valve body and surrounds the corrugated pipe, and a second sealing assembly and a third sealing assembly are correspondingly arranged between the corrugated pipe protection sleeve and the upper cover and between the corrugated pipe protection sleeve and the valve rod. And the safety of the angle valve under the working condition of a high-toxicity medium is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to control valve technical field especially is a kind of bellows upper development formula angle valve for containing phosgene medium. BACKGROUND

[0002] NDI (1,5-naphthalene diisocyanate) as an important chemical raw material, mainly used for producing high-performance polyurethane material. NDI due to its excellent mechanical properties and chemical corrosion resistance, is widely used in automobile, aerospace, building and electronic and electrical fields. Its preparation process, 1,5-naphthalene diamine (NDA) as one of raw materials, with phosgene reaction synthesis NDI, this step is the key link in the whole synthesis process. Phosgene is a toxic gas, has very high harm to human body. Therefore, in the reaction process of phosgene, strict safety measures must be taken to prevent leakage and pollution to the environment. This is very high to the sealing performance and stability of valve. The traditional valve has the deficiencies in sealing performance, stability and maintenance convenience, and is difficult to meet the actual production demand. SUMMARY

[0003] Therefore, the utility model provides a kind of bellows upper development formula angle valve for containing phosgene medium, greatly improve the angle valve use safety and reliability, reduce the operation and maintenance difficulty, realize the safety of angle valve under the high toxicity medium working condition.

[0004] To solve the above technical problems, the utility model provides a kind of bellows upper development formula angle valve for containing phosgene medium, comprising:

[0005] Valve body, is provided with the first through hole and second through hole of intercommunication;

[0006] Valve seat, is installed at the first through hole of the valve body, the valve seat is inlaid and is installed at the outlet passage of reaction equipment, and first sealing assembly is arranged between the valve seat and the outlet passage;

[0007] Valve core assembly, including the valve stem of being connected in the valve body along the axial activity and the valve core being connected with the valve stem and can be sealed contact with the valve seat, the valve core can be communicated or cut off the first through hole with the reaction equipment inside under the action of the valve stem;

[0008] Upper cover, is installed on the valve seat and is away from the valve core one end;

[0009] Bellows, including the first end and second end of being oppositely arranged in the axial direction, the first end of the bellows is installed on the upper cover, the second end of the bellows is installed on the valve stem;

[0010] A corrugated tube protective sleeve is installed in the inner cavity of the valve body and surrounds the corrugated tube, and second and third sealing assemblies are correspondingly arranged between the corrugated tube protective sleeve and the upper cover and between the corrugated tube protective sleeve and the valve rod.

[0011] In an embodiment of the present application, the reaction equipment is provided with a mounting flange with the outlet channel, the valve seat comprises a cylindrical body and a mounting disc extending from one axial end of the cylindrical body, and the mounting disc is mounted on the mounting flange and abuts against the valve body.

[0012] In an embodiment of the present application, a flange extends axially and outwardly from the mounting flange, and the mounting disc is provided with a groove suitable for embedding the flange.

[0013] In an embodiment of the present application, the first sealing assembly comprises at least two first sealing rings arranged between the outer circle of the cylindrical body and the inner wall of the outlet channel.

[0014] In an embodiment of the present application, a first winding gasket is arranged between the groove and the flange and / or between the mounting disc and the valve body.

[0015] In an embodiment of the present application, the valve core is provided with mounting holes arranged in steps, the side walls of part of the mounting holes are provided with threaded structures, the end portion of the valve rod close to the valve core is provided with a mounting portion, the mounting portion comprises a mounting head extending into the mounting hole, a cylindrical surface of part of the valve rod, and a groove arranged between the mounting head and the cylindrical surface of part of the valve rod and used for mounting a split ring, and a threaded sleeve is sleeved on the cylindrical surface of part of the valve rod and is threadedly connected with the mounting hole.

[0016] In an embodiment of the present application, a sealing conical surface is arranged on the outer periphery of the valve core, and a conical surface sealing pair is formed between the sealing conical surface and the valve seat.

[0017] In an embodiment of the present application, a guide block is welded on the inner cavity of the valve body, and the valve rod is slidingly connected to the guide block.

[0018] In an embodiment of the present application, the upper cover is provided with a packing hole, the valve rod passes through the packing hole and is connected to an external actuator, the first end of the corrugated tube is connected to the bottom periphery of the packing hole by welding, and the second end of the corrugated tube is connected to the valve rod by welding.

[0019] In an embodiment of the utility model, the bellows protection cover outer wall is close to the valve body's inner cavity wall, the bellows protection cover includes first end and second end which are oppositely arranged, the first end of bellows protection cover extends radially outward and has a flange between the upper cover and the valve body, the second sealing assembly includes second winding gasket between the flange and the upper cover and between the flange and the valve body respectively;

[0020] The second end of the bellows protection cover is provided with a guide sleeve extending radially inward to the valve stem, and the third sealing assembly includes at least two second sealing rings arranged between the guide sleeve inner hole and the valve stem.

[0021] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0022] The utility model discloses a bellows upper expansion type angle valve containing light gas medium, at least two perfluoroether O-shaped rings are arranged between the valve seat outer circle and the inner wall of the reaction equipment outlet channel, which prevents the medium from accumulating between the valve seat and the gap between the equipment flange flange. The bellows itself forms an isolated sealing barrier between the valve stem and the valve body inner cavity, preventing light gas from penetrating into the external environment. The bellows protection cover is close to the valve body inner cavity wall, and second and third sealing assemblies (winding gaskets, flooding ring, perfluoroether O-shaped ring, etc.) are arranged between the bellows protection cover and the upper cover, the valve body and the valve stem respectively, realizing multiple sealing and further improving the anti-leakage performance.

[0023] The bellows deforms flexibly in the axial direction, moves with the valve stem, and the valve stem transmits the opening and closing actions of the valve core and the force. Meanwhile, the bellows itself acts as a metal sealing barrier to block the leakage of the medium in the valve body to the outside. The bellows protection cover surrounds the outside of the bellows, tightly cooperates with the valve body, and is provided with multiple sealing assemblies. Even if the bellows body is accidentally damaged, a second line of defense can be formed by the bellows protection cover, the second sealing assembly and the third sealing assembly thereon, further reducing the risk of leakage.

[0024] The utility model discloses at least two perfluoroether O-shaped rings are arranged between the valve seat and the reaction equipment outlet channel, forming a redundant seal. Winding gaskets can also be added between the flange and the groove to further enhance the sealing effect and prevent the medium from being trapped in the gap between the valve seat and the equipment flange flange. The first end of the bellows protection cover is provided with a radially inwardly extending guide sleeve, and at least two sealing rings such as flooding ring and perfluoroether O-shaped ring are arranged between the guide sleeve and the valve stem, forming another redundant sealing structure.

[0025] The valve core and the valve rod adopt a split structure, are connected and positioned through a threaded sleeve and a split ring.

[0026] The valve core end and the valve seat adopt a conical surface sealing pair, can meet bidirectional VI level sealing requirements, and the valve core can be independently replaced, and maintenance cost is lower.

[0027] When the valve rod slides in the flow channel of the valve body inner cavity, the guiding block welded in the valve body guides, for the long rod structure angle valve, the guiding block can effectively prevent lateral vibration or deflection of the valve rod, improve the stability and reliability of opening and closing actions, and reduce internal part abrasion. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to make the content of the utility model more easily be clearly understood, the following according to the specific embodiment of the utility model and combining with the drawings, the utility model is further detailed.

[0029] Figure 1 It is the structure diagram of the bellows upper expansion type angle valve of the utility model.

[0030] Figure 2 It is Figure 1 The enlarged view of I part in Fig.

[0031] Figure 3 It is Figure 1 The enlarged view of II part in Fig.

[0032] Figure 4 It is Figure 1 The enlarged view of III part in Fig.

[0033] Explanation of the drawing marks in the specification:

[0034] 1, valve core assembly;1.1, valve core;1.2, split ring;1.3, threaded sleeve;

[0035] 1.4, valve rod;1.4.1, mounting head;2, first sealing assembly;2.1, first sealing ring;

[0036] 3, valve seat;4, first winding gasket;

[0037] 5, valve body;5a, first through hole;5b, second through hole;5.1, guiding block;6, third sealing assembly;6a, flooding ring;6b, second sealing ring;

[0038] 12. Second nut; 13. Second stud; 14. First stud; 15. First nut; 16. Mounting flange; 17. Reaction apparatus. DETAILED DESCRIPTION

[0039] The utility model will be further described below in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0040] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not indicated or implied that the indicated technical features must have a specific orientation, structure and operation, so it cannot be understood as the limitation of the utility model.

[0041] In the utility model, the meaning of "several" is one or more, and the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are not included in the number; "above", "below", "within" and the like are included in the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0042] In the utility model, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or can communicate with each other; it can be the communication or interaction relationship between two elements inside or two elements. The person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0043] Reference Figure 1 As shown in the utility model discloses a kind of bellows 9 upper expansion type angle valve containing phosgene medium, comprising:

[0044] Valve body 5, it is provided with the first through hole 5a and second through hole 5b of intercommunication;

[0045] Valve seat 3, it is installed at the first through hole 5a of the valve body 5, the valve seat 3 is inlaid and installed at the outlet passage of reaction apparatus 17 (such as reaction kettle), and is provided with first sealing assembly 2 between the outlet passage, medium (phosgene) flows out from the second through hole 5b from reaction apparatus 17 through valve seat 3, first through hole 5a;

[0046] The valve core assembly 1 comprises a valve stem 1.4 movably connected to the valve body 5 in the axial direction and a valve core 1.1 connected to the valve stem 1.4 and capable of sealing contact with the valve seat 3, the valve core 1.1 being capable of communicating or isolating the interior of the reaction device (17) with the first port 5a under the action of the valve stem 1.4;

[0047] The upper cover 11 is installed on the valve seat 3 away from the valve core 1.1;

[0048] The bellows 9 comprises a first end and a second end arranged axially opposite to each other, the first end of the bellows 9 being installed on the upper cover 11, and the second end of the bellows 9 being installed on the valve stem 1.4;

[0049] The bellows protection sleeve 8 is installed in the inner cavity of the valve body 5 and surrounds the bellows 9, the second sealing assembly 10 and the third sealing assembly 6 being correspondingly arranged between the bellows protection sleeve 8 and the upper cover 11 and between the bellows protection sleeve 8 and the valve stem 1.4.

[0050] It can be understood that the bellows 9, which is flexible in the axial direction, can be made of metal and moves with the valve stem 1.4, and under the action of the actuator, the valve core 1.1 moves through transmission to control the flow of medium.

[0051] Through the above arrangement, the bellows 9 not only transmits the movement of the valve stem 1.4, but also plays a sealing role, and the internal isolation prevents the medium from penetrating; and in cooperation with the externally arranged bellows protection sleeve 8, further ensures that the medium does not leak along the control passage.

[0052] In one embodiment, referring to Figure 2 The reaction device 17 is installed with a mounting flange 16 having the outlet passage, the valve seat 3 comprises a cylindrical body and a mounting disc extending from one axial end of the cylindrical body, the mounting disc being installed on the mounting flange 16 and abutting against the valve body 5.

[0053] Specifically, a flange extends axially outwardly from the mounting flange 16, and the mounting disc is provided with a groove suitable for the flange.

[0054] Flanges are arranged on the mounting flange 16 of the reaction device 17, and corresponding grooves are arranged on the mounting disc of the valve seat 3, so that quick and accurate alignment and installation can be achieved; and winding gaskets are arranged between the grooves and the flanges and between the valve body 5 and the mounting disc, so as to further ensure the tight fit of the mounting surface. This mode simplifies the alignment operation when the equipment side is connected with the valve, shortens the installation period, and also reduces the potential leakage risk caused by assembly errors. In addition, the valve seat 3 is directly inserted into the outlet passage of the reaction device 17, the transition of the medium between the valve seat 3 and the valve body 5 is smoother, the medium dead angle and deposition area are reduced, and it is beneficial to the rapid conveying and discharge of the medium (phosgene).

[0055] In one embodiment, referring to Figure 2 As shown in the figure, the first sealing assembly 2 includes at least two first sealing rings 2.1 arranged between the outer circle of the cylindrical body and the inner wall of the outlet passage. The first sealing ring 2.1 adopts a perfluoroether O-ring. The perfluoroether O-ring has stable performance in high-temperature and high-toxicity environments, excellent corrosion resistance and aging resistance, and meets the requirements of severe working conditions.

[0056] The two first sealing rings 2.1 form a redundant seal, which can prevent the medium from accumulating between the gap between the valve seat 3 and the flange of the equipment.

[0057] In one embodiment, first winding gaskets 4 are arranged between the grooves and the flanges and / or between the mounting disc and the valve body 5. The first winding gaskets 4 are pre-tightened and sealed by the first studs 14 and the first nuts 15 arranged between the valve seat 3 and the valve body 5

[0058] In one embodiment, the valve core 1.1 is provided with mounting holes arranged in steps, and the side walls of part of the mounting holes are provided with threaded structures. The end of the valve rod 1.4 close to the valve core 1.1 is provided with a mounting part, and the mounting part includes a mounting head 1.4.1 extending into the mounting hole, a part of the cylindrical surface of the valve rod 1.4, and a groove arranged between the mounting head 1.4.1 and the part of the cylindrical surface of the valve rod 1.4 and used for mounting the split ring 1.2. A part of the cylindrical surface of the valve rod 1.4 is sleeved with a threaded sleeve 1.3 which is threadedly connected with the mounting hole. In addition, the mounting head 1.4.1 is a circular arc surface and abuts against the bottom wall of the mounting hole.

[0059] The valve core 1.1 and the valve rod 1.4 adopt a split design and are fastened and connected through the threaded sleeve 1.3, which is convenient to disassemble and assemble and easy to maintain.

[0060] In one embodiment, the outer periphery of the valve core 1.1 is provided with a sealing taper surface, and a taper sealing pair is formed between the sealing taper surface and the valve seat 3, which can meet the bidirectional VI-level sealing requirements.

[0061] In one embodiment, referring toFigure 3 As shown, a guide block 5.1 is welded in the inner cavity (flow channel) of the valve body 5, and the valve stem 1.4 is slidingly connected to the guide block 5.1, thereby improving the guiding stability of the elongated valve stem 1.4.

[0062] Referring to Figure 1 As shown, the upper cover 11 is provided with a packing hole, the valve stem 1.4 passes through the packing hole and is connected to an external actuator, the first end of the bellows 9 is welded to the bottom end of the packing hole, and the second end of the bellows 9 is welded to the valve stem 1.4 (separated from the inside of the bellows 9). The bellows 9 adopts a positive type structure, is welded to the valve stem 1.4 at one end and the upper cover 11 at the other end, and meets the ISO 15848 A level leakage requirement. The structure is compact, firm and reliable, can avoid micro-leakage at the connection between the bellows 9 and the valve stem 1.4 to the greatest extent, and meets the high-level sealing requirement of toxic and highly corrosive media such as light gas.

[0063] It should be noted that the bellows 9 can effectively seal the inner cavity of the valve body 5 and the upper cover 11, and the bellows protection sleeve 8 further improves the sealing performance.

[0064] Referring to Figure 4 As shown, in one embodiment, the outer wall of the bellows protection sleeve 8 is tightly attached to the inner cavity wall of the valve body 5, the bellows protection sleeve 8 includes oppositely arranged first and second ends, the first end of the bellows protection sleeve 8 extends radially outward to form a flange between the upper cover 11 and the valve body 5, and the second sealing assembly 10 includes second winding gaskets 10a located between the flange and the upper cover 11 and between the flange and the valve body 5, respectively; the second winding gaskets 10a are pre-tightened and sealed by the second stud 13 and the second nut 12 arranged between the upper cover 11 and the valve body 5.

[0065] The second end of the bellows protection sleeve 8 is provided with a guide sleeve 8a extending radially inward to the cylindrical surface of the valve stem 1.4, and the third sealing assembly 6 includes at least two second sealing rings 6b arranged between the inner hole of the guide sleeve 8a and the valve stem 1.4. The second sealing rings 6b can include a generic packing ring 6a and a perfluoroether O-ring, and the redundant sealing design ensures the reliability of the sealing of the highly toxic light gas medium.

[0066] The guide sleeve 8a and the valve stem 1.4 are arranged with at least two sealing rings such as the generic packing ring 6a and the perfluoroether O-ring, forming another redundant sealing structure.

[0067] It should be noted that the sealing rings (generic packing ring 6a, perfluoroether O-ring, etc.) used in the embodiment can be flexibly selected according to the corrosiveness of the light gas medium and the process temperature and pressure requirements.

[0068] In operation, the valve seat 3 is installed at the first port 5a of the valve body 5, with one end entering the outlet channel of the reaction device 17, and a first sealing assembly 2 (e.g. a seal ring composed of a perfluoroether O-ring and a redundant design) is arranged between the channel and the valve seat 3 to ensure a tight fit between the device and the valve seat 3, preventing leakage of the medium (e.g. toxic phosgene).

[0069] In actual working conditions, the phosgene medium passes from the reaction device 17 through the valve seat 3 into the first port 5a of the valve body 5, and is then transmitted by the flow channel in the valve body 5 to the second port 5b, achieving smooth delivery of the medium. The valve core assembly 1 is composed of an axially movable valve stem 1.4 and a valve core 1.1 connected to the valve stem 1.4. The valve core 1.1 is driven by the valve stem 1.4 to achieve axial reciprocating motion in the valve body 5, thereby forming a tight seal (or breaking the seal) with the valve seat 3, and playing a role in opening or closing the flow path of the phosgene medium.

[0070] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A bellows (9) up-and-over type angle valve for use in a medium containing phosgene, characterized in that The utility model relates to a valve for reaction equipment, which comprises: a valve body (5) provided with a first through hole (5a) and a second through hole (5b) in communication with each other; a valve seat (3) installed at the first through hole (5a) of the valve body (5), the valve seat (3) extending into and being installed at an outlet channel of a reaction device (17), and a first sealing assembly (2) being arranged between the valve seat (3) and the outlet channel; a valve core assembly (1) comprising a valve stem (1.4) movably connected to the valve body (5) in the axial direction and a valve core (1.1) connected to the valve stem (1.4) and capable of sealing contact with the valve seat (3), the valve core (1.1) being capable of communicating or cutting off the inside of the reaction device (17) with the first through hole (5a) under the action of the valve stem (1.4); an upper cover (11) installed on the valve seat (3) away from the valve core (1.1); a bellows (9) comprising a first end and a second end arranged in the axial direction, the first end of the bellows (9) being installed on the upper cover (11), and the second end of the bellows (9) being installed on the valve stem (1.4); a bellows protection sleeve (8) installed in the inner cavity of the valve body (5) and surrounding the bellows (9), the bellows protection sleeve (8) being provided with a second sealing assembly (10) and a third sealing assembly (6) between the upper cover (11) and the valve stem (1.4).

2. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 1, characterized in that The reaction device (17) is provided with a mounting flange (16) having the outlet channel, the valve seat (3) comprises a cylindrical body and a mounting disc extending from one axial end of the cylindrical body, the mounting disc is mounted on the mounting flange (16) and abuts against the valve body (5).

3. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 2, characterized in that A flange extends outward in the axial direction of the mounting flange (16), and the mounting disc is provided with a groove suitable for the flange.

4. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 2, characterized in that The first sealing assembly (2) comprises at least two first sealing rings (2.1) arranged between the outer circle of the cylindrical body and the inner wall of the outlet channel.

5. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 3, characterized in that A first winding gasket (4) is arranged between the groove and the flange and / or between the mounting disc and the valve body (5).

6. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 1, characterized in that The valve core (1.1) is provided with mounting holes arranged in steps, part of the side walls of the mounting holes are provided with threaded structures, the end of the valve stem (1.4) close to the valve core (1.1) is provided with a mounting part, the mounting part comprises a mounting head (1.4.1) extending into the mounting hole, part of the cylindrical surface of the valve stem (1.4), and a groove arranged between the mounting head (1.4.1) and part of the cylindrical surface of the valve stem (1.4) and used for mounting a split ring (1.2), and part of the cylindrical surface of the valve stem (1.4) is sleeved with a threaded sleeve (1.3) threadedly connected with the mounting hole.

7. An up-and-over angle valve with bellows (9) for use in a medium containing phosgene according to claim 1, characterized in that A sealing cone surface is arranged on the outer periphery of the valve core (1.1), and a conical surface sealing pair is formed between the sealing cone surface and the valve seat (3).

8. An up-and-over angle valve with bellows (9) for a medium containing phosgene according to claim 1, characterized in that A guide block (5.1) is welded in the inner cavity of the valve body (5), and the valve stem (1.4) is slidingly connected to the guide block (5.1).

9. An up-and-over angle valve with bellows (9) for use in a medium containing phosgene according to claim 1, characterized in that The upper cover (11) is provided with a filler hole, the valve rod (1.4) passes through the filler hole and is connected with an external actuator, a first end of the bellows (9) is connected to a bottom end periphery of the filler hole by welding, and a second end of the bellows (9) is connected to the valve rod (1.4) by welding.

10. An up-and-over angle valve with bellows (9) for use in a medium containing phosgene according to claim 1, characterized in that The outer wall of the bellows protection sleeve (8) is tightly attached to the inner cavity wall of the valve body (5), the bellows protection sleeve (8) comprises oppositely arranged first and second ends, the first end of the bellows protection sleeve (8) extends radially outward and has a flange between the upper cover (11) and the valve body (5), and the second sealing assembly (10) comprises a second winding gasket (10a) between the flange and the upper cover (11) and between the flange and the valve body (5) respectively; The second end of the bellows protection sleeve (8) is provided with a guide sleeve (8a) extending radially inward to the cylindrical surface of the valve rod (1.4), and the third sealing assembly (6) comprises at least two second sealing rings (6b) between the inner hole of the guide sleeve (8a) and the valve rod (1.4).

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