Three-way valve with no melt residue at end of valve core in polymerization production process

Abstract

The utility model belongs to the technical field of spinning instruments, and relates to a three-way valve with no melt residue at the ends of valve cores in the polymerization production process, the three-way valve comprises a valve body pipeline and two valve cores, the valve body pipeline is in an inverted T shape and comprises a vertical part and a horizontal part, the horizontal part comprises a left section, a middle section and a right section which are sequentially arranged, the middle section is arranged below the vertical part, and the right section is arranged below the middle section. The left section and the right section are arranged on the left side and the right side of the vertical portion, the two valve elements are arranged in the left section and the right section respectively, and the ends of the valve elements are composed of horseshoe pieces and sealing pieces. The horseshoe piece is of a beveled horizontal cylindrical structure, the center axis of the horseshoe piece is parallel to the center axis of the horizontal part and located below the horizontal part, the large-area bottom face of the horseshoe piece is closer to the middle section relative to the small-area bottom face of the horseshoe piece, and the distance between the two bottom faces of the horseshoe piece is sequentially increased from top to bottom. The sealing piece is positioned on one side of the horseshoe piece away from the middle section; and the middle-section internal flow channel is an arc-shaped flow channel. The valve core is simple in structure, and solves the problem that melt remains at the end of the valve core after the valve is used for a long time.

Description

Technical Field

[0001] The utility model belongs to the technical field of spinning equipment and relates to a three-way valve with no melt residue at the end of a valve core in a polymerization production process. Background Art

[0002] At present, the polyester production process mostly adopts a multi-kettle continuous production process, and a large number of polymer melt valves are used in the production process. In the previous valves, the end of the valve core is flat, and there are large dead angles at the corners, which are easy to cause material retention. The melt does not flow for a long time, and it is always in a high-temperature heating state, which will cause coking and carbonization. Because it becomes very hard after carbonization, it will cause strain to the valve when opening and closing the valve, making it very difficult to open and close, causing irreversible damage to the sealing surface, and the melt cannot be sealed and leaks. The falling of coke is easy to cause blockage of the downstream melt filtration device and damage the pelletizer cutter. Coke is easy to accumulate in the melt pipeline or the low point of the equipment. Long-term accumulation will cause blockage of the melt pipeline and equipment, and normal production cannot be achieved. The melt will degrade and change color after long-term heating, which will cause quality degradation of downstream spinning products and cause great waste. Some important valves cannot be repaired at any time and need to be stopped for processing. For large-scale continuous production equipment, the waste caused by stopping is unimaginable.

[0003] To solve the above problems, patent application CN201731108U discloses a high-pressure jacketed spiral melt valve, including a valve body and a valve core. The valve body is connected to one feed pipe and at least two discharge pipes. There are two valve cores, which are respectively installed at both ends of the valve body through brackets. The valve core is connected to a screw rod installed in a threaded sleeve, and the threaded sleeve is driven to rotate by a reducer. Each discharge pipe and feed pipe are distributed along the axial direction of the valve body. The valve core is placed in a spiral guide sleeve, and a spiral groove is provided on the spiral guide sleeve. A pin shaft stuck in the spiral groove is fixed on the outer wall of the valve core. The end face of the valve core is a circular surface. The different positions of the pin shaft in the spiral groove make the circular surface of the valve core correspond to different discharge pipes and feed pipes and form a smooth transition section between the circular surface and different discharge pipes and feed pipes. Although the high-pressure jacketed spiral melt valve avoids the dead angle at the corner of the end of the valve core and allows the melt to flow smoothly there, reducing the resistance to the melt, the valve core combines linear movement with its own rotational movement during switching, the switching resistance is small, and the switching pressure is stable, but when used for too long, the melt will still coke and carbonize at the end of the valve core. This is because the end face of the valve core is a smooth transition surface, which is prone to produce melt vortices. Over time, the properties of the melt will change, causing the melt to stick to the end of the valve core, resulting in coking and carbonization.

[0004] Therefore, it is necessary to develop a three-way valve in which no melt remains at the end of the valve core during polymerization production after long-term use. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art and provide a three-way valve with no melt residue at the end of the valve core in the polymerization production process after long-term use.

[0006] In order to achieve the above purpose, the scheme adopted by the utility model is as follows:

[0007] A three-way valve with no melt residue at the end of the valve core in a polymerization production process, comprising a valve body pipeline and two valve cores, the valve body pipeline is in an inverted T shape, comprising a vertical portion and a horizontal portion, the horizontal portion is a left section, a middle section, and a right section arranged in sequence, the middle section is located below the vertical portion, the left section and the right section are located on the left and right sides of the vertical portion, an inlet is provided on the vertical portion, a first outlet is provided on the left section, and a second outlet is provided on the right section, the two valve cores are respectively located in the left section and the right section, and the end of the valve core is composed of a horseshoe member and a sealing member;

[0008] The horseshoe piece is an oblique horizontal cylindrical structure, the central axis of the horseshoe piece is parallel to the central axis of the horizontal part and is located below the central axis of the horizontal part, the bottom surface of the horseshoe piece with a larger area is closer to the middle section than the bottom surface with a smaller area, and the distance between the two bottom surfaces of the horseshoe piece increases from top to bottom;

[0009] In each valve core, the sealing member is located on the side of the horseshoe member away from the middle section;

[0010] The inner flow channel of the middle section is an arc-shaped flow channel.

[0011] When the three-way valve of the utility model conveys melt in the polymerization production process, it can ensure that there is no melt residue at the end of the valve core after long-term use. The reasons are as follows:

[0012] The horseshoe is eccentric in the horizontal part, so that the flow rate of the melt above the horseshoe is greater than the flow rate of the melt below the horseshoe, which is conducive to the melt flushing the horseshoe and the seal, and prevents the material from forming a dead corner at the end of the valve core;

[0013] The horseshoe piece is a horizontal cylindrical structure with an oblique cut. The distance between the two bottom surfaces of the horseshoe piece increases from top to bottom. This allows the melt to continuously flush the bottom surface of the horseshoe piece with a larger area, preventing the flow of goods from forming a dead corner on the horseshoe piece.

[0014] The internal flow channel in the middle section is an arc-shaped flow channel, which can reduce the flow resistance and make the material flow more easily. It will not form eddies or stay in dead corners for a long time inside the valve, causing coking and carbonization.

[0015] As the preferred technical solution:

[0016] As described above, in a three-way valve with no melt residue at the end of the valve core during a polymerization production process, the angle between the bottom surface with a larger area of ​​the horseshoe piece and the central axis of the horseshoe piece is 45-60°, and such a design can effectively reduce flow resistance.

[0017] As described above, in a three-way valve with no melt residue at the end of the valve core in a polymerization production process, the inner walls of the left section and the right section are each provided with a first sealing surface, the two first sealing surfaces are located between the first outlet and the second outlet, and the two first sealing surfaces are respectively used to interact with the seals of the two valve cores to achieve a sealing effect.

[0018] As described above, in a three-way valve with no melt residue at the end of the valve core during a polymerization production process, in each valve core, the sealing member is a truncated cone structure, which is coaxial with the horseshoe member, and its small end face has the same diameter and fits with the smaller bottom surface of the horseshoe member; the first sealing surface is a conical surface.

[0019] As described above, in a three-way valve with no melt residue at the end of the valve core during a polymerization production process, the portion of the valve core other than the end is a rod body. In each valve core, the rod body is located on the side of the end away from the middle section and is connected to the seal and coaxial.

[0020] In a three-way valve with no melt residue at the end of the valve core during a polymerization production process as described above, a partial length section of the rod body is a sealing section; the inner walls of the left section and the right section are each provided with a second sealing surface, the two second sealing surfaces are respectively located above the first outlet and the second outlet, and the two second sealing surfaces are respectively used to interact with the sealing sections of the two rod bodies to achieve a sealing effect.

[0021] In the three-way valve with no melt residue at the end of the valve core in a polymerization production process as described above, the sealing section is a truncated cone structure, the large end is closer to the middle section than the small end; and the second sealing surface is a conical surface.

[0022] As described above, in a three-way valve with no melt residue at the end of the valve core in a polymerization production process, the horseshoe parts of the two valve cores are coaxial.

[0023] As described above, a three-way valve with no melt residue at the end of the valve core during a polymerization production process, the three-way valve with no melt residue at the end of the valve core during a polymerization production process also includes two steam purge devices, the two steam purge devices are connected to the horizontal part, and are respectively located above the first outlet and the second outlet, and the gas outlet directions are respectively toward the first outlet and the second outlet.

[0024] As described above, the three-way valve with no melt residue at the end of the valve core during the polymerization production process further comprises a heating jacket which is sleeved on the valve body pipeline.

[0025] Beneficial effects:

[0026] The utility model discloses a three-way valve with no melt residue at the end of the valve core in a polymerization production process. The valve has a simple structure and an ingenious design, which greatly improves the problem of the valve not being tightly closed or even damaged due to coking and carbonization of materials at the end of the valve core in online production. The valve core can be used continuously for 5 years without any melt residue, thus eliminating the economic loss caused by production stoppage and improving the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of a three-way valve with no melt residue at the end of the valve core in a polymerization production process of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the valve core part in a polymerization production process of the utility model;

[0029] Among them, 1-horseshoe member, 2-first sealing surface, 3-inlet, 4-sealing member, 5-second sealing surface, 6-first outlet, 7-rod body, 8-steam purge device, 9-heating jacket, 10-second outlet. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0031] A three-way valve with no melt residue at the end of the valve core during polymerization production, such as Figures 1-2 As shown, it includes 1 valve body pipeline, 2 valve cores, 2 steam purge devices 8 and a heating jacket 9;

[0032] The valve body pipeline is in an inverted T shape, including a vertical part and a horizontal part;

[0033] The horizontal part is composed of a left section, a middle section, and a right section arranged in sequence. The middle section is located below the vertical section, and its internal flow channel is an arc-shaped flow channel. The left section and the right section are located on the left and right sides of the vertical section. An inlet 1 is provided on the vertical section, a first outlet 6 is provided on the left section, and a second outlet 10 is provided on the right section.

[0034] The inner walls of the left section and the right section are each provided with a first sealing surface 2 and a second sealing surface 5, the first sealing surface 2 and the second sealing surface 5 are both conical surfaces, the two first sealing surfaces 2 are located between the first outlet 6 and the second outlet 10, and the two second sealing surfaces 5 are respectively located above the first outlet 6 and the second outlet 10;

[0035] The end of the valve core is composed of a horseshoe member 1 and a sealing member 4;

[0036] In each valve core, the horseshoe member 1 is a chamfered horizontal cylindrical structure, the central axis of which is parallel to the central axis of the horizontal part and is located below the central axis of the horizontal part, the bottom surface of the horseshoe member 1 with a larger area is closer to the middle section than the bottom surface with a smaller area, the distance between the two bottom surfaces of the horseshoe member 1 increases from top to bottom, and the angle between the bottom surface of the horseshoe member 1 with a larger area and the central axis of the horseshoe member 1 is 45-60°;

[0037] In each valve core, the sealing member 4 is a truncated cone structure, which is located on the side of the horseshoe member 1 away from the middle section and is coaxial with the horseshoe member 1. The small end face of the sealing member 4 has the same diameter as the smaller bottom face of the horseshoe member 1 and fits closely.

[0038] The part of the valve core other than the end is the rod body 7. In each valve core, the rod body 7 is located on the side of the end away from the middle section, connected to the seal 4 and coaxial; a part of the length of the rod body 7 is the sealing section, which is a truncated cone structure, and its large end is closer to the middle section than the small end;

[0039] The two valve cores are respectively located in the left section and the right section, and the horseshoe members 1 of the two valve cores are coaxial;

[0040] The two first sealing surfaces 2 are respectively used to interact with the sealing members 4 of the two valve cores to achieve a sealing effect, and the two second sealing surfaces 5 are respectively used to interact with the sealing sections of the two rod bodies 7 to achieve a sealing effect;

[0041] Two steam purge devices 8 are connected to the horizontal portion and are respectively located above the first outlet 6 and the second outlet 10, and the gas outlet directions are respectively toward the first outlet 6 and the second outlet 10;

[0042] The heating jacket 9 is sleeved on the valve body pipeline.

Claims

1. A three-way valve with no melt residue at the end of the valve core during polymerization production, comprising a valve body pipeline and two valve cores, the valve body pipeline is in an inverted T-shape, including a vertical portion and a horizontal portion, the horizontal portion is a left section, a middle section, and a right section arranged in sequence, the middle section is located below the vertical portion, the left section and the right section are located on the left and right sides of the vertical portion, the vertical portion is provided with an inlet (3), the left section is provided with a first outlet (6), the right section is provided with a second outlet (10), the two valve cores are respectively located in the left section and the right section, and the invention is characterized in that: The end of the valve core is composed of a horseshoe member (1) and a sealing member (4); The horseshoe member (1) is an obliquely cut horizontal cylindrical structure, the central axis of the horseshoe member (1) is parallel to the central axis of the horizontal portion and is located below the central axis of the horizontal portion, the bottom surface of the horseshoe member (1) with a larger area is closer to the middle section than the bottom surface with a smaller area, and the distance between the two bottom surfaces of the horseshoe member (1) increases from top to bottom; In each valve core, the sealing member (4) is located on a side of the horseshoe member (1) away from the middle section; The inner flow channel of the middle section is an arc-shaped flow channel.

2. A three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 1, characterized in that: The angle between the bottom surface with a larger area of ​​the horseshoe member (1) and the central axis of the horseshoe member (1) is 45-60°.

3. The three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 1, characterized in that: The inner walls of the left section and the right section are each provided with a first sealing surface (2), the two first sealing surfaces (2) are located between the first outlet (6) and the second outlet (10), and the two first sealing surfaces (2) are respectively used to interact with the sealing elements (4) of the two valve cores to achieve a sealing effect.

4. A three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 3, characterized in that: In each valve core, the sealing member (4) is a truncated cone structure, which is coaxial with the horseshoe member (1), and its small end surface has the same diameter as and fits with the smaller bottom surface of the horseshoe member (1); the first sealing surface (2) is a conical surface.

5. A three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 4, characterized in that: The portion of the valve core other than the end head is a rod body (7). In each valve core, the rod body (7) is located on the side of the end head away from the middle section and is connected to the sealing member (4) and is coaxial.

6. A three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 5, characterized in that: A partial length section of the rod body (7) is a sealing section; the inner walls of the left section and the right section are each provided with a second sealing surface (5); the two second sealing surfaces (5) are respectively located above the first outlet (6) and the second outlet (10); the two second sealing surfaces (5) are respectively used to interact with the sealing sections of the two rod bodies (7) to achieve a sealing effect.

7. A three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 6, characterized in that: The sealing section is a truncated cone structure, with the larger end being closer to the middle section than the smaller end; and the second sealing surface (5) is a conical surface.

8. The three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 1, characterized in that: The horseshoe members (1) of the two valve cores are coaxial.

9. The three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 1, characterized in that: The three-way valve with no melt residue at the end of the valve core during the polymerization production process also includes two steam purge devices (8), which are connected to the horizontal part and are respectively located above the first outlet (6) and the second outlet (10), and the gas outlet directions are respectively toward the first outlet (6) and the second outlet (10).

10. The three-way valve with no melt residue at the end of the valve core in a polymerization production process according to claim 1, characterized in that: The three-way valve with no melt residue at the end of the valve core during the polymerization production process also includes a heating jacket (9), which is sleeved on the valve body pipeline.

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