Polyester slurry blending system and mixing device thereof

Abstract

The invention provides a polyester slurry blending system and a mixing device thereof.The polyester slurry blending system comprises a powder raw material tank, a mixing storage tank and a dihydric alcohol conveying pipeline connected with the mixing storage tank, and the powder raw material tank is communicated with the dihydric alcohol conveying pipeline through the mixing device arranged on the dihydric alcohol conveying pipeline; the storage tank is also provided with a circulating port and is connected to the dihydric alcohol conveying pipeline through a circulating pipe connected with the circulating port, and a circulating path of the powder slurry is formed by utilizing the dihydric alcohol conveying pipeline; meanwhile, a polyester slurry mixing funnel is adopted as a mixing device and comprises a funnel main body and a mixing pipe forming a part of a dihydric alcohol conveying pipeline, the mixing pipe comprises a feeding section, a mixing cavity and a discharging section which are communicated in sequence, one end, connected with the mixing cavity, of the feeding section extends into the mixing cavity, and the sectional area of the feeding section is gradually reduced; according to the scheme, the mixing uniformity of the polyester glycol and the powder raw material in the polyester slurry is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester production equipment, and in particular relates to a polyester slurry mixing system and a mixing device thereof. Background Art

[0002] In a narrow sense, polyester refers to polyethylene terephthalate. In a broad sense, all polymers obtained by polycondensation of diols and dibasic acids can be called polyesters. Whether it is polyethylene terephthalate or other polyester production processes, most of them involve the mixing process of powdered dibasic acids and liquid diols. In traditional polyester production, dibasic acid powder and diol liquid are directly put into a stirring tank, and the powder is dispersed in the liquid through the stirring of paddle blades, and continuous stirring is performed to prevent particle sedimentation.

[0003] For this purpose, a Chinese invention patent with application number CN202310468659.9 discloses a slurry mixing device for polyester production, including a box body and a stirring blade, and also includes a gas delivery device and a gas disk. The gas disk is arranged on the bottom surface of the inner side of the box body, and the gas disk is a hollow structure. The upper surface of the gas disk is provided with evenly distributed pores, and the pores are connected to the internal space of the gas disk. The gas delivery device is ventilated and connected to the gas disk. The gas delivery device is suitable for delivering gas to the inside of the gas disk. The rotating shaft of the stirring blade is vertically arranged at the center of the box body, the stirring blade is located inside the box body, the stirring blade is located above the gas disk, and the rotating shaft is rotatably connected to the bottom surface of the box body. The gas discharged from the pores can form bubbles inside the polyester slurry, increase the overall volume of the polyester slurry, increase the liquid level of the polyester slurry, increase the depth of the stirring blade immersed in the polyester slurry, and improve the stirring and mixing efficiency of the stirring blade on the polyester slurry; the above scheme improves the mixing effect by improving the slurry mixing device, thereby achieving sufficient mixing of the slurry.

[0004] However, there are certain drawbacks in the above production process, that is, when the dibasic acid powder is put into the stirring tank, the powder micro-cluster size may be large, and it may even enter the liquid phase in blocks; the simple stirring shear strength is low, and the powder dispersion and mixing may be uneven, resulting in large local powder micro-cluster size and a wide distribution range of powder micro-cluster size, which is not conducive to the subsequent esterification reaction step. In order to make the powder dispersed more evenly, it is necessary to increase the stirring residence time, thereby increasing the volume of the stirring tank, resulting in increased investment costs, and the effect is not obvious. In addition, if the feeding metering equipment uses imported weight loss scale metering equipment, it is expensive and has a large investment cost.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a polyester slurry preparation system and a mixing device thereof in view of the above-mentioned problems in the prior art. A mixing device for glycol and powder is arranged at the feed end of a mixing and storage tank, and a circulation pipeline connected to the glycol delivery pipeline is added externally. The mixing device is used to achieve mixing of glycol and powder, and circulation of polyester slurry in the mixing and storage tank, thereby improving the dispersion uniformity of the powder.

[0007] In order to achieve the above-mentioned object, the first aspect of the present invention provides a polyester slurry preparation system, characterized in that it comprises a powder raw material tank, a mixing storage tank and a glycol delivery pipeline connected to the mixing storage tank, wherein the powder raw material tank is connected to the glycol delivery pipeline through a mixing device provided on the glycol delivery pipeline;

[0008] A circulation port is provided at the bottom of the mixing storage tank, the circulation port is connected to one end of a circulation pipeline, and the other end of the circulation pipeline is connected to a glycol delivery pipeline;

[0009] The mixing device is located downstream of the connection between the circulation pipeline and the glycol delivery pipeline.

[0010] In the above scheme, the polyester slurry in the mixing storage tank can be circulated to the mixing device through the circulation pipeline, and then returned to the mixing storage tank through the mixing device. The existing feed pipeline of the mixing storage tank is utilized to realize the circulation of the internal polyester slurry, thereby avoiding the sedimentation of the mixed powder in the polyester slurry during the storage process and improving the mixing uniformity.

[0011] Furthermore, the powder raw material tank is connected to the mixing device through a precise delivery unit.

[0012] In the above scheme, due to the setting of the precise dosing unit, the amount of powder raw material can be accurately controlled, and the powder and polyester diol can be fully mixed in combination with the mixing device and the circulation pipeline, so as to obtain a functional powder slurry with stable powder content and high consistency.

[0013] Furthermore, a metering tank is provided between the powder raw material tank and the mixing device, and the metering tank is connected to the powder raw material tank and the mixing device respectively.

[0014] In the above scheme, by arranging a metering tank between the powder raw material tank and the mixing device, the precise control of the amount of powder raw material added is further improved.

[0015] Furthermore, a powder inlet is provided at the top of the metering tank, and the metering tank is connected to the powder raw material tank through the powder inlet; a powder outlet is provided at the bottom of the metering tank, and the metering tank is connected to the mixing device through the powder outlet;

[0016] The precise delivery unit is arranged between the mixing device and the powder outlet.

[0017] In the current production equipment, there are inevitably errors in the material conveying volume between adjacent tanks, and the stable control of the delivery volume cannot be fully achieved. In the above scheme, between the metering tank and the powder raw material tank, that is, the powder raw material enters the metering tank from the powder raw material tank and is delivered to the mixing device through the metering tank. The metering tank is used as an intermediate storage tank to improve the delivery stability; since a precise delivery device is arranged between the metering tank and the mixing device, the precise delivery unit can be controlled according to different delivery ratios, thereby achieving precise control of the delivery speed and delivery volume.

[0018] Furthermore, a weight sensor is provided on the metering tank, and the powder raw material tank and the metering tank are connected to the powder inlet through a flexible hose;

[0019] The precision dosing unit is connected to the mixing device via a flexible hose.

[0020] In the above scheme, the flexible hose can achieve a stable connection without affecting the weighing accuracy of the weight sensor. Therefore, the weight sensor can more accurately reflect the delivery of the powder raw materials, and can more accurately control the precise delivery unit, thereby improving the delivery accuracy.

[0021] Furthermore, the metering tank is also provided with an air pressure balance port, which is located at the top of the metering tank and is connected to the outlet end of the precision delivery unit through a balance pipe.

[0022] Since the metering tank is not connected to the powder raw material tank when it is being dosed through the precision delivery unit connected to the powder outlet, there is often a problem that normal delivery cannot be performed due to the influence of internal and external air pressure. For this reason, in the above scheme, the air pressure balance port is connected to the precision delivery unit through a balance pipe, and the balance of internal and external air pressure is achieved when the powder raw material in the metering tank is delivered, thereby avoiding the problem that the powder raw material cannot be completely delivered and remains in the metering tank.

[0023] Furthermore, the precise delivery unit is a feeding auger.

[0024] The present invention also provides a mixing device for the polyester slurry preparation system, which is specifically as follows.

[0025] The mixing device is a polyester slurry mixing funnel, including a funnel body and a mixing pipe, the mixing pipe includes a feeding section, a mixing chamber and a discharging section which are connected in sequence, one end of the feeding section connected to the mixing chamber extends into the mixing chamber, and the cross-sectional area gradually decreases along the extension direction, and the funnel body is connected to the mixing chamber;

[0026] The middle part of the discharge section contracts to form a Venturi tube;

[0027] The funnel body is connected to the powder raw material tank, the feed section is connected to the glycol delivery pipeline, and the discharge section is connected to the mixing storage tank.

[0028] The polyester diol enters the mixing chamber from the feeding section of the mixing pipe, is mixed with the powder raw material entering from the funnel body in the mixing chamber, and then enters the mixing storage tank from the discharging section. Since the discharging section forms a Venturi tube, the functional powder and polyester diol can be more fully mixed under the Venturi effect, thereby improving the mixing effect and mixing efficiency of the mixing device.

[0029] Furthermore, the feed section includes a shrinkage tube and a release tube. The shrinkage tube is gradually contracted from one end of the feed section connected to the mixing chamber along the material flow direction. The release tube is connected to the other end of the shrinkage tube and extends from the connection along the material flow direction.

[0030] In the above scheme, due to the presence of the shrinkage tube, the diameter of the feed section becomes smaller, thereby increasing the flow rate of the polyester diol entering the mixing chamber; the presence of the release tube can ensure the flow stability of the polyester diol, ensuring that the polyester diol still has a high speed after entering the mixing chamber. Under the impact of the high-speed flowing polyester diol, some clumped or agglomerated powder raw materials can be dispersed, further improving the mixing effect.

[0031] Furthermore, the connection between the funnel body and the mixing tube is directly opposite to the end of the release tube.

[0032] In the above scheme, the problem that the powder raw material cannot enter the mixing chamber due to the excessively fast flow rate of the polyester diol is avoided, thereby ensuring the smooth delivery of the powder raw material; the polyester diol that enters the mixing chamber from the end of the release tube forms a low-pressure area outside the release tube, and the powder raw material from the funnel body is attracted by the low-pressure area and can enter the mixing chamber at a faster speed, further avoiding the problem that the powder raw material cannot completely enter the mixing device due to the pressure difference; the powder raw material speed under the influence of the pressure difference is faster, which is conducive to the full mixing of the powder raw material and the polyester diol, thereby improving the mixing efficiency.

[0033] Furthermore, one end of the discharge section away from the mixing chamber extends outward to form a stabilizing portion, the radial cross-sectional shape of the stabilizing portion remains unchanged, and the discharge section is connected to the mixing storage tank via the stabilizing portion.

[0034] Alternatively, as an alternative to the above solution, the mixing device includes a funnel body, a feeding section, a mixing chamber and a discharging section, the funnel body, the mixing chamber and the discharging section are connected in sequence, and the end of the funnel body connected to the mixing chamber gradually shrinks;

[0035] The feeding section includes a first feeding section and a second feeding section which are connected to each other. The first feeding section forms an angle with the funnel body and is connected to the inside of the funnel body from the side of the funnel body. The second feeding section is extended from the connection point along the material conveying direction to one end of the funnel body close to the mixing chamber. The diameter of the end of the second feeding section is contracted to form a release tube.

[0036] There is a gap between the extended end of the release tube and the inner wall of the funnel body.

[0037] Preferably, the second feed section is coaxially arranged with the funnel body, and an annular gap is formed between the end of the second feed section and the funnel body.

[0038] In the above scheme, there is a gap between the second feed section and the inner wall of the funnel body. When the polyol enters the interior of the funnel body through the second feed section, negative pressure is generated in the gap, so that the powder raw material can smoothly pass through the gap and mix with the polyester diol; at the same time, the polyester diol enters the mixing chamber in the form of a jet, thereby shearing and crushing the powder raw material, and the mixing of the two can be more fully achieved.

[0039] Preferably, the second feed section is coaxially arranged with the funnel body, and an annular gap is formed between the end of the second feed section and the funnel body.

[0040] In the above scheme, the existence of the annular gap can form a uniform negative pressure zone at the annular gap during the flow of polyester diol. At the same time, the polyester diol can also more fully crush the powder raw material, further improving the mixing effect of the powder raw material and polyester diol.

[0041] The beneficial effects of the present invention are:

[0042] 1. Before the polyester diol and the powder raw material enter the mixing storage tank, they are first mixed by a mixing device, which improves the uniformity of the mixture entering the mixing storage tank. The powder raw material and the polyester diol are evenly mixed through two mixings, which improves the consistency of the polyester slurry and the mixing efficiency of the polyester slurry mixing system.

[0043] 2. A stirring paddle is installed inside the mixing storage tank to maintain the uniformity of the polyester slurry mixing to a certain extent. The circulation of the polyester slurry in the mixing storage tank is realized through the circulation pipeline and the mixing device. The stirring paddle installed in the mixing storage tank cooperates with each other to realize the circulation and mixing of materials from multiple directions, thereby improving the uniformity of the polyester slurry.

[0044] 3. A metering tank is set between the powder raw material tank and the mixing device, and a precise delivery unit is set between the metering tank and the mixing device. A weight sensor is provided on the metering tank, and it is connected to the powder raw material tank and the mixing device respectively through a flexible hose, thereby improving the accuracy of the feed amount and feed speed detection, and thus being able to more accurately control the precise delivery unit, realize the precise delivery of powder raw materials, and improve the delivery accuracy and stability of the polyester slurry mixing system.

[0045] 4. The mixing device is a polyester slurry mixing funnel. A contraction tube and a release tube are arranged at the end of the feeding section of the mixing funnel. By increasing the conveying speed of the polyester diol and setting the discharging section as a Venturi tube, a negative pressure is formed at the connection between the funnel body and the mixing chamber, thereby improving the feeding efficiency of the powder raw material and improving the mixing effect of the mixing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the polyester slurry preparation system of the present invention.

[0047] Figure 2 This is a schematic diagram of the first structure of the mixing device in the polyester slurry preparation system of the present invention.

[0048] Figure 3 for Figure 2 A front view of the mixing device shown.

[0049] Figure 4 for Figure 2 A cross-sectional view of the mixing device shown.

[0050] Figure 5 for Figure 2 A top view of the mixing device is shown.

[0051] Figure 6 This is a second structural schematic diagram of the mixing device in the polyester slurry preparation system of the present invention.

[0052] Figure 7 for Figure 6 A cross-sectional view of the mixing device shown.

[0053] In the figure: 1. powder raw material tank; 2. metering tank; 21. weight sensor; 3. mixing storage tank; 31. circulation port; 32. circulation pipe; 4. precision delivery unit; 5. flexible hose; 6. balance pipe; 7. glycol delivery pipeline; 71. mixing circulation pump; 72. mixing device; 721. funnel body; 722. feeding section; 7221. contraction tube; 7222. release tube; 7223. first feeding section; 7224. second feeding section; 723. mixing chamber; 724. discharging section. DETAILED DESCRIPTION

[0054] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that the following embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0056] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are 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 a limitation on the present invention.

[0057] The present invention provides a polyester slurry preparation system, such as Figures 1 to 7 As shown, it includes a powder raw material tank 1, a mixing storage tank 3 and a glycol delivery pipeline 7 connected to the mixing storage tank 3, and the powder raw material tank 1 is connected to the glycol delivery pipeline 7 through a mixing device 72 provided on the glycol delivery pipeline 7;

[0058] A circulation port 31 is provided at the bottom of the mixing storage tank 3, and the circulation port 31 is connected to one end of a circulation pipe 32, and the other end of the circulation pipe 32 is connected to a glycol delivery pipe 7;

[0059] The mixing device 72 is located downstream of the connection between the circulation pipe 32 and the glycol delivery pipe 7 .

[0060] In the above scheme, the polyester slurry stored in the mixing and storage tank 3 can enter the circulation pipe 32 through the circulation port 31, and return to the mixing and storage tank 3 through the diol delivery pipeline 7 connected to the circulation pipe 32 to realize the external circulation of the polyester slurry, which effectively avoids the problem of the powder raw material depositing downward and causing the polyester slurry to deteriorate in uniformity. The circulation can also avoid the agglomeration of the powder raw material, thereby ensuring the uniformity and consistency of the polyester slurry.

[0061] The following is a further detailed description with reference to specific embodiments.

[0062] Embodiment 1

[0063] As an embodiment of the present invention, this embodiment provides a polyester slurry preparation system, wherein the powder raw material tank 1 is connected to the mixing device 72 through the precise delivery unit 4.

[0064] In this embodiment, a precise delivery unit 4 is provided at the outlet of the powder raw material tank 1, which is connected to the mixing device 72 through the precise delivery unit 4, thereby enabling precise control of the delivery amount of the powder raw material; specifically, the precise delivery unit 4 of this embodiment is a feeding auger.

[0065] Furthermore, in order to improve the accuracy of powder raw material delivery, Figure 1 As shown, a metering tank 2 is further provided between the powder raw material tank 1 and the mixing device 72, and a feeding auger is provided between the metering tank 2 and the mixing device 72. The powder raw material tank 1 first transports the powder raw material to the metering tank 2, which is weighed in the metering tank 2 before being put into the mixing device 72. The metering tank 2 is provided with a weight sensor 21, and the feeding amount and feeding speed can be obtained by weighing the weight change of the powder raw material in the metering tank 2, and the feeding speed of the feeding auger provided between the metering tank 2 and the mixing device 72 can be adjusted in a targeted manner, so as to realize accurate quantitative feeding of the powder raw material, which is beneficial to improving the stability and consistency of the polyester slurry.

[0066] A delivery control device is also provided between the powder raw material tank 1 and the metering tank 2. The delivery control device may be a control valve for controlling the connection between the powder raw material tank 1 and the metering tank 2 or for separating the two, or may be other existing devices capable of realizing controllable material delivery.

[0067] For example, the feeding amount and feeding speed of the powder raw material can be known according to the weighing of the powder raw material in the metering tank 2, and then the feeding speed of the feeding auger can be adjusted according to the actual required feeding amount. For this purpose, the feeding auger can control the auger speed through a variable frequency motor.

[0068] Furthermore, in actual use, the powder raw material in the metering tank 2 may not be able to smoothly enter the mixing device 72 due to the imbalance of internal and external air pressure; for this reason, an air pressure balance port is provided on the top of the metering tank 2, and the air pressure inside and outside the metering tank 2 is balanced through the air pressure balance port, thereby ensuring smooth feeding.

[0069] The open setting of the air pressure balance port is likely to cause dust accumulation inside the metering tank 2, and will also affect the cleanliness of the powder raw material, and further affect the quality and performance of the polyester slurry; for this reason, the air pressure balance port is connected to the outlet end of the precise delivery unit 4 between the mixing device 72 and the metering tank 2 through the balance pipe 6, and the air pressure balance is achieved through the air circulation inside the polyester slurry preparation system, and air will not be introduced from the outside to cause pollution to the polyester slurry production, thereby improving the quality of the polyester slurry.

[0070] Further, such as Figure 1As shown, the feeding control device between the powder raw material tank 1 and the metering tank 2 is connected to the powder inlet of the metering tank 2 through the flexible hose 5, and the outlet end of the feeding auger is connected to the mixing device 72 through the flexible hose 5; the flexible hose 5 is used to achieve the connection, thereby realizing the modular setting between the various tank bodies in the polyester slurry preparation system, and each tank body can be set to a suitable placement position according to actual use requirements; and the use of soft connection reduces the influence of other equipment on the weighing accuracy of the metering tank 2, further ensuring the authenticity and reliability of the weighing results.

[0071] Furthermore, a nitrogen arch breaking system is provided in the metering tank 2 to prevent the material from agglomerating and getting damp or forming explosive dust; shut-off valves are provided between the powder raw material tank 1 and the feeding auger and between the metering tank 2 and the feeding auger to facilitate the maintenance and care of each tank body. The shut-off valve is selected from the common gate valves, gate valves, butterfly valves, etc. in the field. The technical solutions obtained by the technical personnel in this field after simple changes and replacements of the shut-off valve type and setting position based on the known technical principles of the present invention also fall within the protection scope of the present invention.

[0072] Embodiment 2

[0073] As another embodiment of the present invention, this embodiment further makes the following improvements on the basis of the first embodiment.

[0074] In this embodiment, if Figure 1 As shown, the metering tank 2 is also provided with an air pressure balance port, through which the air pressure inside and outside the metering tank 2 is balanced, thereby ensuring the smooth delivery of the powder raw materials.

[0075] The air pressure balance port on the metering tank 2 is connected to the powder raw material delivery path through the balance pipe 6, and the air inside the polyester slurry preparation system is used to achieve air pressure balance in the metering tank 2, avoiding the introduction of external air to cause the powder raw material to be contaminated, thereby improving the cleanliness of the polyester slurry.

[0076] One implementation of this embodiment is that one end of the balance pipe 6 is connected to the air pressure balance port, and the other end is connected to the discharge end of the feeding auger between the mixing device 72 and the metering tank 2. When the powder raw material tank 1 puts the powder raw material into the metering tank 2, or when the metering tank 2 puts the powder raw material into the mixing device 72, the balance pipe 6 is used to transfer the air in the powder raw material feeding path to achieve the balance of the air pressure in the metering tank 2, thereby ensuring that the powder raw material in the powder raw material tank 1 can be smoothly put into the metering tank 2, and at the same time ensuring that the powder raw material in the metering tank 2 can be smoothly discharged into the mixing device 72.

[0077] The balance pipe 6 is connected to the discharge end of the feeding auger. In order to achieve a smooth connection of the balance pipe 6, the discharge end has a three-way structure, so that the discharge end of the feeding auger is connected to the balance pipe 6 and the mixing device 72 respectively.

[0078] Based on the technical principles of the present invention, those skilled in the art can make conventional replacements for the connection mode of the balance pipe 6, which also fall within the protection scope of the present invention.

[0079] Embodiment 3

[0080] As another embodiment of the present invention, this embodiment further makes the following improvements on the basis of the second embodiment. In this embodiment, Figure 1 As shown, a circulation port 31 is provided at the bottom of the mixing storage tank 3, and the circulation port 31 is connected to the glycol delivery pipeline 7 through a circulation pipe 32. The connection between the circulation pipe 32 and the glycol delivery pipeline 7 is located upstream of the mixing device 72, and the glycol delivery pipeline 7 is connected to the feed port provided at the upper part of the mixing storage tank 3 through the mixing device 72.

[0081] Furthermore, a mixing circulation pump 71 is provided on the diol delivery pipeline 7, and the connection between the circulation pipe 32 and the diol delivery pipeline 7 is located upstream of the mixing circulation pump 71, that is, the mixing circulation pump 71 is connected to the diol delivery pipeline and the circulation pipe 32 respectively. The mixing circulation pump 71 can realize the transportation of polyester diol and the circulation of polyester slurry.

[0082] Check valves are also provided on the circulation pipe 32 and the diol delivery pipeline 7 to prevent the polyester diol and the polyester slurry from mixing.

[0083] A stirring device is provided in the mixing storage tank 3, and the stirring device and the mixing circulation pump 71 work independently of each other. The polyester slurry in the mixing storage tank 3 can be stirred by the stirring device, or circulated only through the circulation port 31, and can also be stirred and circulated at the same time, thereby meeting the usage requirements of different users, and powder raw materials with different proportions and different dispersion properties can be fully dispersed, thereby improving the user experience.

[0084] Specifically, the stirring device can be a stirring paddle arranged in the mixing storage tank 3, or it can be an ultrasonic device or other commonly used devices in the field that can achieve stirring and dispersion. The solutions obtained by the technical personnel in this field after making conventional replacements to the stirring device based on the known technical principles of the present invention also fall within the protection scope of the present invention.

[0085] The present invention further provides the mixing device 72 described in the above embodiment, which is specifically as follows.

[0086] Embodiment 4

[0087] As another embodiment of the present invention, this embodiment provides a mixing device 72 as described in the third embodiment, and the mixing device 72 is a polyester slurry mixing funnel.

[0088] In this embodiment, if Figures 2 to 5 As shown, the polyester slurry mixing funnel includes a funnel body 721 and a mixing pipe. The mixing pipe is a part of the glycol delivery pipeline 7. The overall tubular structure with two ends opened is connected in series in the glycol delivery pipeline 7. Along its length direction, it is divided into a feed section 722, a mixing chamber 723 and a discharge section 724 arranged in sequence. The feed section 722 is located at one end of the mixing pipe close to the mixing circulation pump 71 on the glycol delivery pipeline 7. The funnel body 721 is connected to the mixing chamber 723. The powder raw material output from the metering tank 2 enters the funnel body 721 and enters the mixing chamber through the funnel body 721; the polyester diol from the feed section 722 and the powder raw material from the funnel body 721 are mixed once in the mixing chamber 723, and then sent to the mixing storage tank 3. The mixing in the mixing chamber 723 avoids the problem that the powder raw material has a high degree of agglomeration and cannot be fully mixed with the polyester diol, thereby improving the user experience.

[0089] Specifically, Figure 4 As shown, one end of the feed section 722 connected to the mixing chamber 723 extends into the mixing chamber 723, and the cross-sectional area gradually decreases along the extension direction, so that the polyester diol can enter the mixing chamber 723 at a faster speed. The high flow rate of the polyester diol can be used to disperse the agglomerated powder raw materials, thereby achieving full mixing of the powder raw materials and the polyester diol. In order to achieve the transportation stability of the polyester diol, the portion of the feed section 722 extending into the mixing chamber 723 includes a shrink tube 7221 and a release tube 7222. Tube 7221 is formed by shrinking along the extension direction of the feed section 722, and the release tube 7222 is connected to the shrink tube 7221 and extends outward from the end of the shrink tube 7221, that is, the cross-sectional area of ​​the shrink tube 7221 gradually decreases along the extension direction, and the cross-sectional shape of the release tube 7222 remains unchanged along the extension direction; the polyester diol is accelerated by the shrink tube 7221, and the high-speed flowing polyester diol is stably transported to the mixing chamber 723 through the release tube 7222, thereby ensuring the mixing effect of the mixing chamber 723.

[0090] It should be noted here that the delivery of polyester diol and the circulation of polyester slurry can be carried out simultaneously. Because the delivery amount of diol is low and a stable negative pressure cannot be formed at the release pipe 7222, it may directly affect the delivery and mixing of the powder raw materials. The circulation of polyester slurry can supplement the flow rate, thereby ensuring the formation of a stable negative pressure at the release pipe 7222, further improving the stability of the mixing amount and mixing ratio of the powder raw materials.

[0091] In order to ensure the transportation stability of polyester diol, the shrink tube 7221 is funnel-shaped as a whole.

[0092] Furthermore, the discharge section 724 is located on the other side of the mixing chamber 723 opposite to the feed section 722. The discharge section 724 is configured as a venturi tube with a contraction in the middle. The polyester slurry mixed in the mixing chamber 723 passes through the venturi tube at the discharge section 724. The venturi tube is used to perform secondary acceleration on the polyester slurry. Turbulence is formed when passing through the thinnest part of the venturi tube, which further promotes the intense mixing of the solid and liquid phases, and then enters the mixing storage tank 3.

[0093] Further, such as Figure 5 As shown, the connection between the funnel body 721 and the mixing tube is opposite to the end of the release tube 7222. The polyester diol enters the mixing chamber 723 through the release tube 7222, and a low-pressure area is formed around the release tube 7222. Therefore, the powder raw material from the funnel body 721 can enter the mixing chamber 723 more smoothly under the influence of the pressure difference, thereby avoiding the excessive pressure and flow rate of the polyester diol affecting the smooth addition of the powder raw material in the funnel body 721, thereby ensuring the mixing stability.

[0094] Furthermore, the discharge section 724 extends outward from one end of the mixing chamber 723 to form a stabilizing portion, and the radial cross-sectional shape of the stabilizing portion remains unchanged. The discharge section 724 is connected to the mixing and storage tank 3 through the stabilizing portion. The flow stability of the polyester slurry is maintained through the stabilizing portion to ensure that the polyester slurry enters the mixing and storage tank 3 in a fully mixed state. In order to reduce the length of the pipeline, the length of the stabilizing portion should not be too long.

[0095] It should be well known to those skilled in the art that the mixing device described in this embodiment can also be applied to the polyester slurry preparation system described in Example 1 and Example 2, and the solution obtained by combining the mixing device described in this embodiment with Example 1 and Example 2 also falls within the protection scope of the present invention.

[0096] Embodiment 5

[0097] As another embodiment of the present invention, this embodiment differs from the fourth embodiment in that the structure of the mixing device 72 is different.

[0098] In this embodiment, if Figure 6 and Figure 7As shown, the funnel body 721, the mixing chamber 723 and the discharge section 724 are connected in sequence, and the end of the funnel body 721 connected to the mixing chamber 723 gradually shrinks; the feed section 722 includes a first feed section 7223 and a second feed section 7224 that are connected to each other, and the first feed section 7223 is at an angle to the funnel body 721, and is connected to the inside of the funnel body 721 from the side of the funnel body 721, and extends from the connection between the first feed section 7223 and the funnel body 721 along the material flow direction to form a second feed section 7224 that has an angle with the first feed section 7223, and the second feed section 7224 The end portion extends to the connection between the funnel body 721 and the mixing chamber 723, and the diameter of the end portion of the second feeding section 7224 shrinks to form a release tube 7222, and there is a gap between the release tube 7222 and the inner wall of the funnel body 721; since the polyester diol is fed into the mixing chamber 723 through the feeding section 722, the flow rate is increased by the change in the diameter of the release tube 7222, and then a negative pressure is formed in the gap, which promotes the mixing of the powder raw material and the polyester diol in the funnel body 721; at the same time, the polyester diol enters in the form of a jet, thereby realizing the shearing and crushing of the powder raw material, and can more fully achieve the mixing of the two.

[0099] In order to facilitate pipeline connection, the first feed section 7223 and the funnel body 721 are perpendicular to each other.

[0100] In order to further improve the mixing efficiency of the polyester diol and the powder raw material, the end of the second feed section 7224 is set to be coaxial with the funnel body 721, so that the release tube 7222 at the end of the second feed section 7224 is opposite to the mixing chamber 723, and the diameter of the second feed section 7224 is smaller than the diameter of the funnel body 721, and the powder raw material can be transported through the gap between the second feed section 7224 and the funnel body 721; an annular gap is formed between the end of the second feed section 7224 and the inner wall of the funnel body 721. The existence of the annular gap enables the polyester diol entering the funnel body 721 from the release tube 7222 to form a more uniform negative pressure area around the end of the release end 7222, thereby improving the mixing efficiency of the powder raw material and the polyester diol.

[0101] Furthermore, in order to achieve stable transportation of polyester diol, the diameter of the tube between the end of the second feed section 7223 and the release tube 7222 does not change directly, but changes transitionally through the shrink tube 7221, that is, the cross-sectional area of ​​the shrink tube 7221 gradually decreases along the extension direction, and the cross-sectional shape of the release tube 7222 remains unchanged along the extension direction; the polyester diol is accelerated by the shrink tube 7221, and the stable transportation of the high-speed flowing polyester diol is achieved through the release tube 7222, thereby ensuring the mixing effect of the mixing chamber 723.

[0102] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A polyester slurry preparation system, characterized in that: It includes a powder raw material tank, a mixing storage tank and a glycol delivery pipeline connected to the mixing storage tank. The powder raw material tank is connected to the glycol delivery pipeline through a mixing device arranged on the glycol delivery pipeline. A circulation port is provided at the bottom of the mixing storage tank, the circulation port is connected to one end of a circulation pipeline, and the other end of the circulation pipeline is connected to a glycol delivery pipeline; The mixing device is located downstream of the connection between the circulation pipeline and the glycol delivery pipeline.

2. The polyester slurry preparation system according to claim 1, characterized in that: The powder raw material tank is connected to the mixing device through a precision delivery unit; Preferably, the precise delivery unit is a feeding auger.

3. The polyester slurry preparation system according to claim 2, characterized in that: A metering tank is also provided between the powder raw material tank and the mixing device, and the metering tank is connected to the powder raw material tank and the mixing device respectively.

4. The polyester slurry preparation system according to claim 3, characterized in that: A powder inlet is provided at the top of the metering tank, and the metering tank is connected to the powder raw material tank through the powder inlet; a powder outlet is provided at the bottom of the metering tank, and the metering tank is connected to the mixing device through the powder outlet; The precise delivery unit is arranged between the mixing device and the powder outlet.

5. The polyester slurry preparation system according to claim 4, characterized in that: The metering tank is also provided with an air pressure balance port, which is located at the top of the metering tank and is connected to the outlet end of the precision delivery unit through a balance pipe.

6. The polyester slurry preparation system according to claim 4, characterized in that: A weight sensor is also provided on the metering tank, and the powder raw material tank and the metering tank are connected to the powder inlet through a flexible hose; The precision dosing unit is connected to the mixing device via a flexible hose.

7. A mixing device of the polyester slurry preparation system according to any one of claims 1 to 6, characterized in that: The mixing device is a polyester slurry mixing funnel, including a funnel body and a mixing pipe, the mixing pipe includes a feeding section, a mixing chamber and a discharging section which are connected in sequence, one end of the feeding section connected to the mixing chamber extends into the mixing chamber, and the cross-sectional area gradually decreases along the extension direction, and the funnel body is connected to the mixing chamber; The middle part of the discharge section contracts to form a venturi tube; The funnel body is connected to the powder raw material tank, and the mixing pipe is connected in series in the glycol delivery pipeline.

8. The mixing device of the polyester slurry preparation system according to claim 7, characterized in that: The portion of the feed section extending into the mixing chamber includes a shrinkage tube and a release tube. The shrinkage tube is gradually contracted from one end of the feed section connected to the mixing chamber along the material flow direction. The release tube is connected to the other end of the shrinkage tube and extends from the connection along the material flow direction.

9. The mixing device of the polyester slurry preparation system according to claim 8, characterized in that: The connection between the funnel body and the mixing tube is directly opposite to the end of the release tube.

10. A mixing device of the polyester slurry preparation system according to any one of claims 1 to 6, characterized in that: It includes a funnel body, a feeding section, a mixing chamber and a discharging section, wherein the funnel body, the mixing chamber and the discharging section are connected in sequence, and one end of the funnel body connected to the mixing chamber gradually shrinks; The feeding section includes a first feeding section and a second feeding section which are connected to each other. The first feeding section forms an angle with the funnel body and is connected to the inside of the funnel body from the side of the funnel body. The second feeding section is extended from the connection point along the material conveying direction to one end of the funnel body close to the mixing chamber. The diameter of the end of the second feeding section is contracted to form a release tube. There is a gap between the extended end of the release tube and the inner wall of the funnel body; Preferably, the second feed section is coaxially arranged with the funnel body, and an annular gap is formed between the end of the second feed section and the funnel body.

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