Downward-expanding kettle bottom valve of full-bore structure

Abstract

The invention relates to the technical field of valves, and discloses a full-bore-structure downward-expanding kettle bottom valve which comprises a valve body, a valve clack, a valve rod and an executing mechanism, the valve body is provided with an inlet flow channel, a valve cavity channel and an outlet flow channel, and the valve clack is arranged in the valve body and used for closing or opening the inlet flow channel; one end of the valve rod is connected with the valve clack; the other end of the valve rod extends out of the valve body through an opening in the valve body; the executing mechanism is fixed to the valve body, the end, extending out of the valve body, of the valve rod is connected with the executing mechanism, and the executing mechanism is configured to drive the valve clack to close or open the inlet runner through the valve rod. When the valve is in a full-open state, the valve clack is in a full-open state, the valve clack keeps away from the intersection of the inlet flow channel and the outlet flow channel, and the outlet flow channel is unobstructed, so that the cross sectional area of the inlet flow channel is equal to that of the inlet flow channel and is smaller than that of the valve cavity channel; as long as large-particle media which can enter from the inlet flow channel can easily flow out from the outlet flow channel, the structure can avoid the situation that large crystalline particles cannot be discharged.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a downward-expanding kettle bottom valve with a full-diameter structure. Background Art

[0002] The kettle bottom valve is a valve installed at the bottom of the reactor, storage tank and other containers for discharging. It is divided into upper expansion kettle bottom valve, lower expansion kettle bottom valve, plunger kettle bottom valve and kettle bottom ball valve. The kettle bottom valve is connected to the bottom of the reactor, storage tank or other container by flange to eliminate the residual phenomenon of process medium at the bottom of the container and realize the function of emptying and draining.

[0003] The kettle bottom valve is composed of valve body, valve stem, valve seat, valve disc, actuator and other parts. The valve stem is pushed by the actuator to drive the valve disc up and down to achieve the purpose of opening and closing.

[0004] When the bottom valve is used for the discharge and feeding of the PVC reactor, the medium in the reactor is easy to crystallize and then adsorb or accumulate inside the reactor. When the reactor is regularly flushed or cleaned, the crystals in the reactor are too large, resulting in large crystal particles that cannot be discharged. Summary of the invention

[0005] In view of this, the present invention provides a downward-expanding kettle bottom valve with a full-diameter structure to solve the problem that when the kettle bottom valve is used for the discharge and feeding of a PVC reactor, the medium in the reactor is easy to crystallize and then adsorbed or accumulated inside the reactor. When the reactor is regularly flushed or cleaned, the crystallized medium in the reactor is too large, resulting in large crystal particles being unable to be discharged.

[0006] In a first aspect, the present invention provides a full-diameter downward-expanding kettle bottom valve, comprising:

[0007] A valve body, wherein the valve body has an inlet flow channel and an outlet flow channel;

[0008] A valve flap, disposed inside the valve body, the valve flap being used to close or open the inlet flow channel;

[0009] A valve stem, one end of which is connected to the valve disc, and the other end of which extends out of the valve body through the upper opening of the valve body;

[0010] An actuator is fixed to the valve body, one end of the valve stem extending out of the valve body is connected to the actuator, and the actuator is configured to drive the valve disc to close or open the inlet flow channel through the valve stem;

[0011] The cross-sectional area of ​​the inlet flow channel is equal to the cross-sectional area of ​​the outlet flow channel, and the cross-sectional area of ​​the valve cavity channel is larger than the cross-sectional areas of the inlet flow channel and the outlet flow channel.

[0012] By setting the cross-sectional area of ​​the inlet flow channel to be equal to the cross-sectional area of ​​the outlet flow channel, and the cross-sectional area of ​​the valve cavity channel to be larger than the cross-sectional areas of the inlet flow channel and the outlet flow channel, when the valve is fully open, the valve cavity channel is unobstructed. Since the cross-sectional area of ​​the outlet flow channel is equal to the cross-sectional area of ​​the inlet flow channel and both are smaller than the cross-sectional area of ​​the valve cavity channel, any large particle medium that can enter from the inlet flow channel can easily flow out from the outlet flow channel. This structure can prevent large crystalline particles from being unable to be discharged.

[0013] In an optional embodiment, the inlet flow channel is arranged at an angle to the outlet flow channel;

[0014] When the valve flap is in a fully open state, the valve flap avoids the intersection of the inlet flow channel and the outlet flow channel.

[0015] When the valve flap is opened, the medium flows in from the inlet flow channel and then flows out from the outlet flow channel. By setting the valve flap to avoid the intersection of the inlet flow channel and the outlet flow channel, it can be avoided that the valve flap is blocked in the middle of the channel between the inlet flow channel and the outlet flow channel, so as to affect the flow capacity during discharge, and it can be avoided that large particles are blocked in the inlet flow channel during the valve flap switching process, causing the valve flap to fail to close normally.

[0016] In an optional embodiment, there is a smooth transition between the inner wall of the valve body and the inner wall of the outlet flow channel end.

[0017] In an optional embodiment, the downward-expanding kettle bottom valve with a full-bore structure also includes a scraper rod, which is fixed to the valve body and arranged on the periphery of the valve stem. The scraper rod is configured to scrape off debris on the surface of the valve stem when the valve stem moves relative to it.

[0018] During the use of the kettle bottom valve, impurities in the medium that enters the valve body will accumulate on the surface of the valve stem, which will further affect the movement of the valve stem relative to the valve body. Therefore, the present embodiment is provided with a scraper rod member, which is fixed to the valve body and is arranged on the periphery of the valve stem. When the valve stem drives the valve disc to close or open, the valve stem will move relative to the valve body under the drive of the actuator. During this process, the scraper rod member on the periphery of the valve stem can scrape off the impurities accumulated on the surface of the valve stem, and the fallen impurities flow out of the valve body through the outlet channel together with the medium in the valve body.

[0019] In an optional embodiment, the scraper rod member is annularly sleeved on the circumference of the valve stem, and the scraper rod member is arranged between the valve stem and the valve body opening.

[0020] In an optional embodiment, the downward-expanding kettle bottom valve with a full-diameter structure further includes a limit guide, which is sleeved on the circumference of the valve stem and blocks the valve body opening.

[0021] By providing a limit guide, the limit guide is sleeved on the peripheral side of the valve stem. The limit guide can limit the movement of the valve stem together with the scraper rod to prevent the valve stem from deviating during the switching process.

[0022] In an optional embodiment, the downward-expanding kettle bottom valve with a full-bore structure further includes a filler, wherein the filler is arranged on the circumference of the valve stem and the filler is arranged between the scraper rod and the limiting guide member.

[0023] In an optional embodiment, the filler is PTFE filler.

[0024] In an optional embodiment, the downward-expanding kettle bottom valve with a full-diameter structure further includes at least two seals, wherein the two seals are arranged between the limiting guide and the valve stem, and the two seals are respectively arranged at the inner and outer ends of the limiting guide.

[0025] In an optional embodiment, the inner wall of the inlet flow channel is provided with a chamfer, and the circumferential side of the valve disc is provided with a chamfer adapter, and the chamfer adapter is suitable for abutting against the chamfer.

[0026] The present invention provides a full-diameter downward-expanding kettle bottom valve, which has the following advantages:

[0027] 1. The present invention provides a downward-expanding kettle bottom valve with a full-diameter structure, comprising a valve body, a valve disc, a valve stem and an actuator, wherein the valve body has an inlet flow channel and an outlet flow channel, the valve disc is arranged inside the valve body, and the valve disc is used to close or open the inlet flow channel; one end of the valve stem is connected to the valve disc, and the other end of the valve stem extends out of the valve body through an opening on the valve body; the actuator is fixed to the valve body, and one end of the valve stem extending out of the valve body is connected to the actuator, and the actuator is configured to drive the valve disc to close or open the inlet flow channel via the valve stem; wherein the cross-sectional area of ​​the inlet flow channel is equal to or smaller than the cross-sectional area of ​​the outlet flow channel.

[0028] By setting the cross-sectional area of ​​the inlet flow channel to be equal to the cross-sectional area of ​​the outlet flow channel, and the cross-sectional area of ​​the valve cavity channel to be larger than the cross-sectional areas of the inlet flow channel and the outlet flow channel, when the valve is fully open, the valve cavity channel is unobstructed. Since the cross-sectional area of ​​the outlet flow channel is equal to the cross-sectional area of ​​the inlet flow channel and both are smaller than the cross-sectional area of ​​the valve cavity channel, any large particle medium that can enter from the inlet flow channel can easily flow out from the outlet flow channel. This structure can prevent large crystalline particles from being unable to be discharged.

[0029] 2. The present invention provides a downward-expanding kettle bottom valve with a full-diameter structure, which also includes a scraper rod member, which is fixed to the valve body and arranged on the periphery of the valve stem. The scraper rod member is configured to scrape off debris on the surface of the valve stem when the valve stem moves relative to it.

[0030] During the use of the kettle bottom valve, impurities in the medium that enters the valve body will accumulate on the surface of the valve stem, which will further affect the movement of the valve stem relative to the valve body. Therefore, the present embodiment is provided with a scraper rod member, which is fixed to the valve body and is arranged on the periphery of the valve stem. When the valve stem drives the valve disc to close or open, the valve stem will move relative to the valve body under the drive of the actuator. During this process, the scraper rod member on the periphery of the valve stem can scrape off the impurities accumulated on the surface of the valve stem, and the fallen impurities flow out of the valve body through the outlet channel together with the medium in the valve body.

[0031] 3. The present invention provides a downward-expanding kettle bottom valve with a full-diameter structure, which also includes a limit guide member, which is sleeved on the circumference of the valve stem and blocks the valve body opening.

[0032] By setting a limit guide, the limit guide is sleeved on the periphery of the valve stem, and the limit guide can limit the movement of the valve stem together with the scraper rod to prevent the valve stem from deviating during the opening and closing process. At the same time, the limit guide blocks the valve body opening, which can prevent the internal medium of the valve body from leaking at the connection between the valve stem and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic structural view of a downward-expanding kettle bottom valve with a full-diameter structure provided in an embodiment of the present invention;

[0035] Figure 2 for Figure 1 A magnified view of the structure in the middle circle;

[0036] Figure 3 for Figure 2 A magnified view of the structure in the middle circle;

[0037] Figure 4 It is a schematic structural view of a downward-expanding kettle bottom valve with a full-diameter structure provided in an embodiment of the present invention, in which the valve disc is in a fully-open state.

[0038] Description of reference numerals:

[0039] 1-valve body; 11-inlet flow channel; 12-outlet flow channel; 13-valve cavity channel;

[0040] 2-valve disc;

[0041] 3-valve stem;

[0042] 4-Executive agency;

[0043] 5-scraping rod;

[0044] 6-limiting guide;

[0045] 7- Filler;

[0046] 8- Seals. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example

[0050] This embodiment provides a full-diameter downward expansion kettle bottom valve, such as Figure 1 As shown, it includes a valve body 1, a valve disc 2, a valve stem 3 and an actuator 4. The valve body 1 has an inlet flow channel 11, a valve cavity channel 13 and an outlet flow channel 12. The valve disc 2 is arranged inside the valve body 1, and the valve disc 2 is used to close or open the inlet flow channel 11; one end of the valve stem 3 is connected to the valve disc 2, and the other end of the valve stem 3 extends out of the valve body 1 through an opening on the valve body 1; the actuator 4 is fixed to the valve body 1, and one end of the valve stem 3 extending out of the valve body 1 is connected to the actuator 4, and the actuator 4 is configured to drive the valve disc 2 to close or open the inlet flow channel 11 through the valve stem 3; wherein the cross-sectional area of ​​the inlet flow channel 11 is equal to or smaller than the cross-sectional area of ​​the outlet flow channel 12.

[0051] By setting the cross-sectional area of ​​the inlet flow channel 11 equal to the cross-sectional area of ​​the outlet flow channel 12, the cross-sectional area of ​​the valve cavity channel 13 is larger than the cross-sectional areas of the inlet flow channel 11 and the outlet flow channel 12. When the valve is fully open, Figure 4As shown, the valve flap 2 is in the fully open state, and the outlet flow channel 12 is unobstructed. Since the cross-sectional area of ​​the outlet flow channel 12 is equal to the cross-sectional area of ​​the inlet flow channel 11, any large particle medium that can enter from the inlet flow channel 11 can easily flow out from the outlet flow channel 12 without being affected by the valve flap 2 blocking the channel. This structure can prevent large crystalline particles from being unable to be discharged.

[0052] like Figure 1 As shown, the valve body 1 has an inlet flow channel 11 and an outlet flow channel 12, and the valve flap 2 is arranged inside the valve body 1. Figure 1 The valve body 1 is shown in a closed state. At this time, the valve disc 2 is in the inlet flow channel 11 of the valve body 1, and the periphery of the valve disc 2 is in close contact with the inner wall of the inlet flow channel 11, thereby closing the inlet flow channel 11. When the valve body 1 needs to be opened, the actuator 4 pulls the valve disc 2 through the valve stem 3 to move away from the inlet flow channel 11 until the valve disc 2 moves to Figure 4 After the valve body 1 is in the position shown, the valve body 1 is fully opened, and the medium can enter the valve body 1 through the inlet flow channel 11 at this time, and then the medium flows out of the valve body 1 through the outlet flow channel 12.

[0053] The actuator 4 adopts the existing structure of the existing kettle bottom valve, and is directly used in this embodiment.

[0054] In this embodiment, the inlet flow channel 11 and the outlet flow channel 12 are arranged at an angle. Figure 4 As shown, when the valve flap 2 is in a fully open state, the valve flap 2 avoids the intersection of the inlet flow channel 11 and the outlet flow channel 12.

[0055] When the valve flap 2 is opened, the medium flows in from the inlet flow channel 11 and then flows out from the outlet flow channel 12. By setting the valve flap 2 to avoid the intersection of the inlet flow channel 11 and the outlet flow channel 12, it is possible to avoid the valve flap 2 being blocked in the middle of the channel between the inlet flow channel 11 and the outlet flow channel 12, thereby affecting the flow capacity during discharge, and it is possible to avoid large particles being blocked in the inlet flow channel 11 during the switching process of the valve flap 2, resulting in the valve flap 2 being unable to close normally.

[0056] In this embodiment, if Figure 1 and Figure 4 As shown, there is a smooth transition between the inner wall of the valve body 1 and the inner wall of the end of the outlet flow channel 12. By setting a smooth transition between the inner wall of the valve body 1 and the inner wall of the end of the outlet flow channel 12, it is possible to prevent the existence of a corner between the inner wall of the valve body 1 and the inner wall of the end of the outlet flow channel 12, which causes impurities to accumulate inside the corner. Preferably, the roughness of the inner cavity of the valve body and the contact part of the medium is Ra0.2.

[0057] In this embodiment, if Figure 1 and Figure 2As shown, the downward-expanding kettle bottom valve with a full-diameter structure also includes a scraper rod 5, which is fixed to the valve body 1 and is arranged on the side of the valve stem 3. The scraper rod 5 is configured to scrape off debris on the surface of the valve stem 3 when the valve stem 3 moves relative to it.

[0058] During the use of the kettle bottom valve, impurities in the medium entering the valve body 1 will accumulate on the surface of the valve stem 3, which will further affect the movement of the valve stem 3 relative to the valve body 1. Therefore, the present embodiment is provided with a scraper rod 5, which is fixed to the valve body 1 and is arranged on the side of the valve stem 3. When the valve stem 3 drives the valve disc 2 to close or open, the valve stem 3 will move relative to the valve body 1 under the drive of the actuator 4. During this process, the scraper rod 5 on the side of the valve stem 3 can scrape off the impurities accumulated on the surface of the valve stem 3, and the fallen impurities flow out of the valve body 1 through the outlet channel 12 together with the medium in the valve body 1.

[0059] In this embodiment, if Figure 2 As shown, the scraper member 5 is annularly sleeved around the valve stem 3, and the scraper member 5 is disposed between the valve stem 3 and the opening of the valve body 1. By arranging the scraper member 5 between the valve stem 3 and the opening of the valve body 1, while scraping the surface of the valve stem 3, the scraper member 5 can also limit the movement of the valve stem 3 to prevent the valve stem 3 from deviating during the switching process. Specifically, the scraper member 5 can adopt a long scraper bearing.

[0060] In this embodiment, if Figure 2 As shown, the downward-expanding kettle bottom valve with a full-diameter structure further includes a limit guide 6 , which is sleeved on the side of the valve stem 3 and blocks the opening of the valve body 1 .

[0061] By providing a limit guide 6, the limit guide 6 is sleeved on the peripheral side of the valve stem 3. The limit guide 6 can limit the movement of the valve stem 3 together with the scraper rod 5 to prevent the valve stem 3 from deviating during the switching process.

[0062] At the same time, the limiting guide 6 blocks the opening of the valve body 1, which can prevent the medium inside the valve body 1 from leaking at the connection between the valve stem 3 and the valve body 1. Further, in order to strengthen the sealing of the connection between the valve stem 3 and the valve body 1, the full-diameter downward-expanding kettle bottom valve also includes a packing 7, which is arranged on the side of the valve stem 3 and between the scraper 5 and the limiting guide 6. In this embodiment, the packing 7 is a PTFE packing.

[0063] In this embodiment, if Figure 3 As shown, the downward-expanding kettle bottom valve with a full-diameter structure also includes two seals 8, which are arranged between the limiting guide 6 and the valve stem 3, and the two seals 8 are respectively arranged at the inner and outer ends of the limiting guide 6.

[0064] By providing a sealing member 8, such as an O-ring, between the limiting guide member 6 and the valve body 1, leakage of the valve can be further prevented.

[0065] In this embodiment, the inner wall of the inlet flow channel 11 is provided with a chamfer, and a chamfered adapter is provided on the side of the valve disc 2, and the chamfered adapter is suitable for abutting against the chamfer. By providing a chamfer on the inner wall of the inlet flow channel 11 and a chamfered adapter on the side of the valve disc 2, the valve disc 2 is ensured to be smooth in the opening and closing process. Among them, the chamfered adapter is also a chamfer opened on the side of the valve disc 2.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A full-diameter downward-expanding kettle bottom valve, characterized in that: include: A valve body (1), wherein the valve body (1) has an inlet flow channel (11), a valve cavity channel (13) and an outlet flow channel (12); A valve flap (2) is arranged inside the valve body (1), and the valve flap (2) is used to close or open the inlet flow channel (11); A valve stem (3), one end of which is connected to the valve flap (2), and the other end of which extends out of the valve body (1) through an upper opening of the valve body (1); an actuator (4) fixed to the valve body (1); one end of the valve stem (3) extending out of the valve body (1) is connected to the actuator (4); the actuator (4) is configured to drive the valve flap (2) to close or open the inlet flow channel (11) via the valve stem (3); The cross-sectional area of ​​the inlet flow channel (11) is equal to the cross-sectional area of ​​the outlet flow channel (12), and the cross-sectional area of ​​the valve cavity channel (13) is larger than the cross-sectional areas of the inlet flow channel (11) and the outlet flow channel (12).

2. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 1 is characterized in that: The inlet flow channel (11) and the outlet flow channel (12) are arranged at an angle; When the valve flap (2) is in a fully open state, the valve flap (2) avoids the intersection of the inlet flow channel (11) and the outlet flow channel (12).

3. The downward-expanding kettle bottom valve with full-diameter structure according to claim 2 is characterized in that: There is a smooth transition between the inner wall of the valve body (1) and the inner wall of the end of the outlet flow channel (12).

4. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 1 is characterized in that: The invention also comprises a scraper member (5), wherein the scraper member (5) is fixed to the valve body (1) and is arranged on the circumference of the valve stem (3), and the scraper member (5) is configured to scrape off debris on the surface of the valve stem (3) when the valve stem (3) moves relative to the scraper member (5).

5. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 4 is characterized in that: The scraper rod member (5) is annularly sleeved on the circumference of the valve stem (3), and the scraper rod member (5) is arranged between the valve stem (3) and the opening of the valve body (1).

6. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 5, characterized in that: It also comprises a position limiting guide (6), wherein the position limiting guide (6) is sleeved on the circumference of the valve stem (3), and the position limiting guide (6) blocks the opening of the valve body (1).

7. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 6, characterized in that: It also includes a packing (7), wherein the packing (7) is arranged on the peripheral side of the valve stem (3) and the packing (7) is arranged between the scraper member (5) and the limiting guide member (6).

8. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 7, characterized in that: The filler (7) is a PTFE filler.

9. The downward-expanding kettle bottom valve with a full-diameter structure according to claim 6, characterized in that: It also comprises at least two sealing members (8), wherein the two sealing members (8) are arranged between the limiting guide member (6) and the valve stem (3), and the two sealing members (8) are respectively arranged at the inner and outer ends of the limiting guide member (6).

10. The downward-expanding kettle bottom valve with full-diameter structure according to any one of claims 1 to 9, characterized in that: The inner wall of the inlet flow channel (11) is provided with a chamfer, and the circumferential side of the valve flap (2) is provided with a chamfer adapter portion, and the chamfer adapter portion is suitable for abutting against the chamfer.

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