Vortex refrigerating device for cooling spiral feeding system

Abstract

The invention discloses a vortex refrigerating device for cooling a spiral feeding system, which comprises a conveying cylinder, a vortex refrigerating device and a vortex refrigerating device, the additive input pipe is communicated with the conveying cylinder; and the cold air input pipe communicates with the additive input pipe and the refrigerating device, and the refrigerating device is used for refrigerating gas introduced into the cold air input pipe so that cold air can be introduced into the additive input pipe through the cold air input pipe. Thus, the cold air introduced through the cold air input pipe cools the additive input pipe, the abnormity such as wall hanging caused by the fact that the additive is melted and attached to the pipe wall of the additive input pipe is prevented, then pipeline blockage is avoided, continuous and stable production is guaranteed, and the productivity of equipment is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of resin processing, and particularly relates to a vortex refrigeration device for cooling a screw feeding system. Background Art

[0002] In the production process of polyethylene resin, additives need to be added for control. For example, using antioxidants as additives can play roles such as antioxidation and anti-aging, improving product quality.

[0003] However, the melting points of additives such as antioxidants are relatively low, mostly only 70°C, which is lower than the process medium temperature (85 - 100°C) during the production process of polyethylene resin. Thus, the additives are prone to the problem of wall sticking, which may further lead to abnormalities such as pipeline blockage, thereby affecting subsequent production. Summary of the Invention

[0004] The embodiments of this application disclose a vortex refrigeration device for cooling a screw feeding system, which can solve the problem that the subsequent production is affected due to wall sticking in the related screw feeding system.

[0005] To achieve the above object, this application discloses a vortex refrigeration device for cooling a screw feeding system, including: a conveying cylinder with a screw inside; an additive input pipe communicating with the conveying cylinder; a cold air input pipe and a refrigeration device. The cold air input pipe communicates with the additive input pipe and the refrigeration device respectively. The refrigeration device is used to refrigerate the gas introduced into the cold air input pipe, so that the cold air input pipe introduces cold air into the additive input pipe.

[0006] Optionally, the additive input pipe is a jacketed pipe, and includes an inner pipe communicating with the conveying cylinder and an outer pipe sleeving the inner pipe; a jacket layer is formed between the inner pipe and the outer pipe, and the cold air input pipe communicates with the jacket layer.

[0007] Optionally, the refrigeration device is a vortex refrigerator. The cold air output port of the refrigeration device is connected to the cold air input pipe, the hot air discharge port of the refrigeration device communicates with a hot air discharge pipe, and the gas receiving port of the refrigeration device communicates with a gas input pipe.

[0008] Optionally, it further includes a branch pipe, which is arranged on the same side as the additive input pipe. The branch pipe communicates with the gas input pipe and the conveying cylinder respectively, and the gas in the gas input pipe can be blown to the side of the conveying cylinder through the branch pipe.

[0009] Optionally, the branch pipe has a blowing part extending into the conveying cylinder. The blowing part is located between the screw and the additive input pipe, and is arranged along the extrusion direction of the material. A plurality of blowing ports are arranged on the blowing part along the extrusion direction, and the gas in the gas input pipe can be blown towards the screw through the plurality of blowing ports of the blowing part of the branch pipe.

[0010] Optionally, a plurality of the additive input pipes, a plurality of the cold air input pipes, and a plurality of the refrigeration devices are provided. The plurality of cold air input pipes are respectively in one-to-one correspondence and communication with the plurality of refrigeration devices and the plurality of additive input pipes. The hot air discharge pipe is provided with a plurality of discharge ports for one-to-one correspondence and communication with the plurality of refrigeration devices; the gas input pipe is provided with a plurality of input ports for one-to-one correspondence and communication with the plurality of refrigeration devices.

[0011] Optionally, the refrigeration device is directly connected to the discharge port of the hot air discharge pipe, or is connected to the discharge port of the hot air discharge pipe through an access side pipe;

[0012] The refrigeration device is directly connected to the input port of the gas input pipe, or is connected to the input port of the gas input pipe through an access side pipe.

[0013] Optionally, the plurality of cold air input pipes and the plurality of refrigeration devices are sequentially arranged along the material extrusion direction of the conveying cylinder.

[0014] It can be seen that the vortex refrigeration device of the present application has the following advantages with the above settings:

[0015] The vortex refrigeration device for cooling the screw feeding system disclosed in the present application includes: a conveying cylinder with a screw arranged inside; an additive input pipe communicating with the conveying cylinder; a cold air input pipe and a refrigeration device. The cold air input pipe is respectively connected to the additive input pipe and the refrigeration device. The refrigeration device is used to cool the gas introduced into the cold air input pipe so that the cold air input pipe introduces cold air into the additive input pipe. In this way, the cold air introduced through the cold air input pipe cools the additive input pipe, preventing abnormal situations such as wall hanging caused by the melting of the additive adhering to the inner wall of the additive input pipe, and further avoiding pipeline blockage, so as to ensure the effective progress of production and further ensure the production capacity of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a structural diagram of the screw feeding system disclosed in the present application;

[0018] Figure 2 Structural diagram of the additive input pipe disclosed in the present application;

[0019] Figure 3 Structural diagram of the refrigeration device disclosed in the present application.

[0020] Explanation of reference numerals:

[0021] 10 - conveying cylinder,

[0022] 20 - screw,

[0023] 30 - additive input pipe, 31 - inner pipe, 32 - outer pipe,

[0024] 41 - cold air input pipe, 43 - gas input pipe, 42 - hot air discharge pipe, 44 - side pipe, 45 - branch pipe, 451 - control valve,

[0025] 50 - refrigeration device,

[0026] 51 - nozzle, 52 - regulating valve, 53 - cold end pipe, 54 - eddy current chamber, 55 - hot end pipe. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0029] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the production process of polyethylene resin, additives need to be added for control. However, the melting point of the additives is relatively low, mostly only 70°C, which is lower than the process medium temperature (85 - 100°C) in the production process of polyethylene resin. Thus, the additives are prone to the problem of wall sticking, which may further lead to abnormalities such as pipeline blockage, thereby affecting subsequent production. Therefore, the technical solution of this application is developed. The following will be elaborated in conjunction with Figures 1 to 3 for description.

[0033] This application discloses an eddy current refrigeration device for cooling a screw feeding system, including: a conveying cylinder 10, a screw 20, an additive input pipe 30, a cold air input pipe 41, and a refrigeration device 50.

[0034] Among them, the conveying cylinder 10 is used for conveying materials such as polyethylene. Specifically, a screw 20 is arranged inside the conveying cylinder 10. The screw 20 is driven by a motor to rotate. The material is input from the input end of the conveying cylinder 10 and is output from the output end of the conveying cylinder 10 under the rotational driving action of the screw 20.

[0035] The additive input pipe 30 is connected to the conveying cylinder 10. The additive input pipe 30 is used to input additives such as antioxidants into the materials in the conveying cylinder 10 to control the materials and achieve the purposes of antioxidant and anti-aging of the materials.

[0036] The cold air input pipe 41 is respectively connected to the additive input pipe 30 and the refrigeration device 50. The refrigeration device 50 is used to refrigerate the gas introduced into the cold air input pipe 41 so that the cold air input pipe 41 introduces cold air into the additive input pipe 30.

[0037] In this way, the cold air introduced through the cold air input pipe 41 cools the additive input pipe 30, preventing abnormalities such as wall sticking caused by the melting of the additives adhering to the inner wall of the additive input pipe 30, and further avoiding pipeline blockage, so as to ensure the effective progress of production and thus ensure the production capacity of the equipment.

[0038] Optionally, the additive input pipe 30 can be a jacketed pipe, and includes an inner pipe 31 communicating with the conveying cylinder 10 and an outer pipe 32 sleeving the inner pipe 31; a jacket layer is formed between the inner pipe 31 and the outer pipe 32, and the cold air input pipe 41 communicates with the jacket layer. For example, the temperature of the cold air introduced into the jacket layer is about -10 to 0 °C. By continuously cooling the inner pipe 31, the temperature of the additive in the inner pipe 31 is reduced to 20 to 30 °C, which is lower than the melting point temperature of the additive. In this way, the cold air in the cold air input pipe 41 does not directly enter the additive input pipe 30, but cools the inner pipe 31, thereby preventing the additive from reaching the melting point and adhering to the inner wall of the inner pipe 31 to cause wall hanging. Such a refrigeration method is more scientific and reasonable, preventing the cold air from entering the conveying cylinder 10 through the additive input pipe 30 and causing waste of cold energy.

[0039] Optionally, the refrigeration device 50 can be a vortex tube cooler. The cold air outlet of the refrigeration device 50 is connected to the cold air input pipe 41. The temperature of the cold air output by the refrigeration device 50 is -10 to 0 °C, and can be reduced to -46 °C at the lowest. The hot air discharge port of the refrigeration device 50 communicates with the hot air discharge pipe 42. The temperature of the hot air discharged by the refrigeration device 50 is 60 to 80 °C, and can reach 127 °C at the highest. The gas receiving port of the refrigeration device 50 communicates with the gas input pipe 43. The gas received by the refrigeration device 50 is industrial air, with a pressure of about 0.4 to 0.6 MPA and a temperature of the ambient temperature.

[0040] The vortex tube cooler is a new type of refrigeration element using compressed air, mainly composed of a nozzle 51, a vortex tube and a regulating valve 52. Among them, the vortex tube includes a cold end tube 53, a vortex chamber 54 and a hot end tube 55 which are connected in sequence. The regulating valve 52 is of a tapered plug structure and is arranged at the port position of the hot end tube 55. The cold end tube 53 communicates with the cold air input pipe 41, the hot end tube 55 communicates with the hot air discharge pipe 42, and the nozzle 51 communicates with the vortex chamber 54 and the gas input pipe 43 respectively. During refrigeration, only need to introduce compressed air into the side inlet of the vortex tube, and cold air will be ejected from one end, while hot air will be ejected from the other end. The principle is as follows:

[0041] Since the vortex tube is a three-way pipe, the air inlet is at the nozzle 51 on the side of the tube body. The gas input pipe 43 inputs compressed air from the nozzle 51 into the vortex chamber 54 of the vortex tube through the gas receiving port. The convergent nozzle 51 causes the passing air flow to continuously expand and accelerate. Finally, the air flow enters the hot end tube 55 at the speed of sound and diffuses along the pipe with the same diameter, thus forming a high-speed rotating vortex. The air flow close to the center has the maximum angular velocity, while the air flow close to the wall tube has a relatively lower angle. The vortices in the inner and outer circles will rub against each other due to different angular velocities. At the beginning, the vortex rotating at high speed in the inner circle will drive the vortex in the outer circle to rotate at low speed under the action of its own power and friction. In this process, in order to maintain rotation, the inner circle vortex will continuously convert the internal energy of the gas into the required kinetic energy, which causes the internal energy to continuously decrease, and the temperature of the inner circle vortex also continuously decreases. However, the outer circle vortex can continuously rotate through the kinetic energy obtained by friction. When rotating, its internal energy continuously increases and the temperature gradually rises. At this time, in the vortex tube, the inner circle is a low-temperature vortex and the outer circle is a high-temperature vortex. These two kinds of vortices will simultaneously rush towards the hot gas discharge port with the hot end tube 55. At the hot gas discharge port, the hot air flow is on the outside, so it is easier to dissipate from the gap between the regulating valve 52 with a conical plug structure and the hot end tube 55 and is discharged from the hot gas discharge pipe 42. The cold air vortex will be blocked by the regulating valve 52. The cold air vortices that cannot be dissipated in time accumulate more and more, and the pressure will increase. Finally, the cold air is pressed out from the cold air output port of the cold end tube 53 in the opposite direction and is introduced into the additive input pipe 30 through the cold air input pipe 41.

[0042] Optionally, the vortex refrigeration device may further include a branch pipe 45. The branch pipe 45 is arranged on the same side as the additive input pipe 30. The branch pipe 45 is respectively communicated with the gas input pipe 43 and the conveying cylinder 10. The gas in the gas input pipe 43 can be blown towards the side of the conveying cylinder 10 through the branch pipe 45. In this way, on the one hand, the gas in the gas input pipe 43 not only provides gas for the refrigeration device 50, but also can directly blow the screw 20 to realize the cooling of the inside of the conveying cylinder 10. On the other hand, the gas blown by the gas input pipe 43 towards one side of the screw 20 can preferably block the hot gas emitted by the material on one side of the screw 20 from entering the additive input pipe 30, thereby avoiding the additive from obtaining heat and melting and sticking to the wall, so that the additive in the additive input pipe 30 can obtain a better cooling effect and further prevent the sticking phenomenon.

[0043] Optionally, generally speaking, to achieve better antioxidant effects, multiple additive input pipes 30 need to be arranged along the extrusion direction of the material, so that the conveying cylinder 10 has multiple additive addition points, which can make the additives be more evenly mixed into the material. For this purpose, the branch pipe 45 has a blowing part extending into the conveying cylinder 10. The blowing part is located in the conveying cylinder 10 and between the screw 20 and the additive input pipe 30. The blowing part of the branch pipe 45 is arranged along the extrusion direction of the material. Multiple blowing ports are arranged on the blowing part of the branch pipe 45 along the extrusion direction. The gas in the gas input pipe 43 can be blown towards the screw 20 through the multiple blowing ports of the blowing part of the branch pipe 45. In this way, there are multiple blowing points between the screw 20 and the additive input pipe 30. The gas blown out from the multiple blowing points achieves coverage over the entire length range of the screw 20, with a wider coverage range, which can better prevent the heat emitted by the material on one side of the screw 20 from entering the additive input pipe 30, further improving the cooling effect of the additives in the additive input pipe 30 and better preventing the phenomenon of wall sticking in the additive input pipe 30.

[0044] Optionally, the multiple blowing ports of the branch pipe 45 correspond one-to-one to the multiple additive input pipes 30 to achieve a better heat blocking effect.

[0045] Optionally, a control valve 451 can be arranged on the branch pipe 45 to control the timing of the gas entering the conveying cylinder 10 and select the on-off according to needs.

[0046] Optionally, multiple additive input pipes 30, multiple cold air input pipes 41 and multiple refrigeration devices 50 are all arranged. The multiple cold air input pipes 41 are respectively and correspondingly connected to the multiple refrigeration devices 50 and the multiple additive input pipes 30. The hot air discharge pipe 42 has multiple discharge ports for the multiple refrigeration devices 50 to be correspondingly connected one-to-one; the gas input pipe 43 has multiple input ports for the multiple refrigeration devices 50 to be correspondingly connected one-to-one.

[0047] In the first aspect, as described above, the multiple cold air input pipes 41 and the multiple additive input pipes 30 are arranged in sequence along the extrusion direction of the material in the conveying cylinder 10, so that the additives are added to the conveying cylinder 10 more evenly, thereby improving the control effect on the material. The refrigeration device 50 cools the additive input pipes 30 one-to-one, so as to ensure the cooling effect and better avoid abnormal phenomena such as wall sticking. In the second aspect, the multiple refrigeration devices 50 are all connected in parallel to the hot air discharge pipe 42 and in parallel to the gas input pipe 43, making the pipeline layout more reasonable.

[0048] Optionally, the refrigeration device 50 is directly connected to the discharge port of the hot gas discharge pipe 42, or is connected to the discharge port of the hot gas discharge pipe 42 through the access of a side pipe 44; the refrigeration device 50 is directly connected to the input port of the gas input pipe 43, or is connected to the input port of the gas input pipe 43 through the access of a side pipe 44, further improving the rationality of the pipeline layout.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An eddy current refrigeration device for cooling a screw feeding system, characterized in that Comprising: A conveying cylinder (10) with a screw (20) arranged inside; An additive input pipe (30) communicating with the conveying cylinder (10); A cold air input pipe (41) and a refrigeration device (50), the cold air input pipe (41) communicating with the additive input pipe (30) and the refrigeration device (50) respectively, The refrigeration device (50) is used for refrigerating the gas introduced into the cold air input pipe (41) so that the cold air input pipe (41) introduces cold air into the additive input pipe (30).

2. The eddy current refrigeration device according to claim 1, characterized in that, The additive input pipe (30) is a jacketed pipe and includes an inner pipe (31) communicating with the conveying cylinder (10) and an outer pipe (32) sleeving the inner pipe (31); A jacket layer is formed between the inner pipe (31) and the outer pipe (32), and the cold air input pipe (41) communicates with the jacket layer.

3. The vortex refrigeration device according to claim 1, characterized in that The refrigeration device (50) is a vortex refrigerator, the cold air outlet of the refrigeration device (50) is connected to the cold air input pipe (41), the hot air discharge outlet of the refrigeration device (50) communicates with a hot air discharge pipe (42), and the gas receiving port of the refrigeration device (50) communicates with a gas input pipe (43).

4. The eddy current refrigeration device according to claim 3, characterized in that, It further includes a branch pipe (45), the branch pipe (45) is arranged on the same side as the additive input pipe (30), The branch pipe (45) communicates with the gas input pipe (43) and the conveying cylinder (10) respectively, The gas in the gas input pipe (43) can be blown to the side of the conveying cylinder (10) through the branch pipe (45).

5. The eddy current refrigeration device according to claim 4, wherein, The branch pipe (45) has a blowing part extending into the conveying cylinder (10), and the blowing part is located between the screw (20) and the additive input pipe (30), The blowing part of the branch pipe (45) is arranged along the extrusion direction of the material, and a plurality of blowing ports are arranged along the extrusion direction on the blowing part of the branch pipe (45), and the gas in the gas input pipe (43) can be blown to the screw (20) through the plurality of blowing ports of the blowing part of the branch pipe (45).

6. The eddy current refrigeration device according to claim 3, wherein, A plurality of the additive input pipes (30), a plurality of the cold air input pipes (41) and a plurality of the refrigeration devices (50) are provided, and the plurality of cold air input pipes (41) communicate with the plurality of refrigeration devices (50) and the plurality of additive input pipes (30) in one-to-one correspondence respectively, The hot air discharge pipe (42) is provided with a plurality of discharge ports for the plurality of refrigeration devices (50) to communicate in one-to-one correspondence; The gas input pipe (43) is provided with a plurality of input ports for the plurality of refrigeration devices (50) to communicate in one-to-one correspondence.

7. The eddy current refrigeration device according to claim 6, characterized in that, The refrigeration device (50) directly communicates with the discharge port of the hot air discharge pipe (42), or communicates with the discharge port of the hot air discharge pipe (42) through an access side pipe (44); The refrigeration device (50) directly communicates with the input port of the gas input pipe (43), or communicates with the input port of the gas input pipe (43) through an access side pipe (44).

8. The vortex refrigeration device according to claim 6, characterized in that, The plurality of cold air input pipes (41) and the plurality of refrigeration devices (50) are all arranged in sequence along the material extrusion direction of the conveying cylinder (10).

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