Polyester slurry blending and mixing device and polyester slurry blending system

Abstract

The invention provides a polyester slurry blending and mixing device and a polyester slurry blending system. 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 a mixing device arranged on the dihydric alcohol conveying pipeline; the mixing device comprises a feeding section and a mixing section, the feeding section comprises a feeding cavity and a funnel main body, the feeding cavity is communicated with the dihydric alcohol conveying pipeline, the funnel main body is connected with the feeding cavity, a funnel neck is formed by extending from the joint to a discharge port of the feeding cavity, and a gap is formed between the funnel neck and the discharge port; the mixing cavity is arranged at the downstream of the feeding section along the extension direction of the funnel neck, is communicated with the mixing storage tank and is connected with the feeding section through a discharge port; 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 to circulate the polyester slurry; according to the scheme, the uniformity of 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 device and a polyester slurry mixing system. 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 powder is put into the stirring tank, the powder micro-cluster may be large in size, and may even enter the liquid phase in a block form; the simple stirring shear strength is low, and the powder dispersion and mixing may be uneven, resulting in large local powder micro-cluster sizes and a wide distribution range of powder micro-cluster sizes, 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 an increase in investment costs, and the effect is not obvious. In addition, if the feed metering equipment uses imported loss-in-weight scale metering equipment, it is expensive and has a high 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 mixing device and a polyester slurry mixing system to address the problems in the above-mentioned prior art. The flow direction of the diol entering the feed chamber in the mixing device is the same as the extension direction of the funnel neck, and negative pressure is generated when the diol passes through the gap between the end of the funnel neck and the discharge port, so that the powder raw material can be smoothly mixed with the diol under the influence of the negative pressure. At the same time, the diol forms a jet at the gap to shear the powder raw material, 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 mixing device, comprising a feeding section and a mixing chamber connected to each other;

[0008] The feeding section includes a feeding chamber and a funnel body. The feeding chamber has a discharge port connected to the mixing chamber; the mixing chamber has a discharge port for discharging the polyester slurry. The funnel body is connected to the feeding chamber and extends from the connection to the discharge port to form a funnel neck. There is a gap between the end of the funnel neck and the discharge port.

[0009] In the above scheme, polyester slurry generally refers to a mixture of diol and powder slurry, wherein the diol enters the mixing device from the feed chamber, and the powder raw material enters the mixing device from the funnel body. In the process of the diol from the feed chamber flowing along the feed section and entering the mixing chamber, it always flows along the extension direction of the funnel neck. When passing through the gap between the end of the funnel neck and the discharge port, a negative pressure is generated at the end of the funnel neck, which is beneficial to the discharge of the powder raw material in the funnel body, and the diol enters the mixing chamber in a jet manner through the gap, thereby realizing shearing and crushing of the powder raw material, and being able to more fully achieve the mixing of the two.

[0010] Furthermore, the feed cavity comprises a guide portion and a discharge portion which are sequentially arranged along the extension direction of the funnel neck, and the guide portion is arranged around the funnel neck to form an annular cavity;

[0011] The discharge portion is communicated with the guide portion, gradually shrinks along the extension direction of the funnel neck to wrap the end of the funnel neck, and forms a discharge port at the contraction end, which is communicated with the mixing chamber through the discharge port.

[0012] In the above scheme, the guide part is arranged around the funnel neck to form an annular cavity, so that the diol is evenly distributed around the funnel neck, thereby forming a uniform negative pressure area at the end of the funnel neck, ensuring that the powder raw materials discharged from the end of the funnel neck can be evenly dispersed around, thereby improving the mixing effect.

[0013] Furthermore, the mixing device also includes,

[0014] A guide tube is connected to the guide portion and extends outwardly in a radial direction of the guide portion, and the annular cavity is connected to the outside through the guide tube;

[0015] The mixing device has at least two guide tubes, and the connection positions of the plurality of guide tubes and the guide part are evenly spaced along the axial direction of the guide part.

[0016] Preferably, the plurality of guide tubes are symmetrically arranged about the guide portion.

[0017] In the above scheme, multiple guide tubes are provided to enable the glycol to enter uniformly from multiple directions around the guide portion, thereby improving the consistency of the negative pressure formed at the discharge port; the multiple guide tubes are symmetrically arranged about the guide portion to further improve the consistency of the glycol feed amount in each direction, thereby improving the mixing uniformity and mixing efficiency.

[0018] Furthermore, the other ends of the multiple guide tubes converge to form a feed port; this solution simplifies the connection of the guide tubes, and by setting the feed port and the diameter of the guide tube, it can ensure that the flow rate of each guide tube is consistent, thereby achieving consistency in the feed amount in all directions of the guide part.

[0019] Furthermore, the cross-sectional area of ​​the mixing chamber gradually increases in a direction away from the feeding section.

[0020] In the above scheme, the cross-sectional area of ​​the mixing chamber gradually increases in the direction away from the feeding section, and cooperates with the discharge part to form a venturi tube structure, which can better achieve full mixing of the polyester diol and the powder raw material and improve the mixing efficiency.

[0021] The second aspect of the present invention provides a polyester slurry preparation system, which has the polyester slurry preparation and mixing device described in the above scheme, and the polyester slurry preparation system includes a powder raw material tank, a mixing storage tank and a diol delivery pipeline connected to the mixing storage tank;

[0022] The mixing device is connected in series in the glycol delivery pipeline through the feed port and the discharge port, and the powder raw material tank is connected to the funnel body;

[0023] 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;

[0024] The mixing device is located downstream of the connection between the circulation pipeline and the glycol delivery pipeline.

[0025] 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.

[0026] Furthermore, the powder raw material tank is connected to the funnel body of the mixing device through the precise delivery unit.

[0027] 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.

[0028] Furthermore, a metering tank is provided between the powder raw material tank and the mixing device, 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;

[0029] The precise delivery unit is arranged between the mixing device and the powder outlet.

[0030] By setting a metering tank between the powder raw material tank and the mixing device, the precise control of the powder raw material delivery amount is further improved; in the current production equipment, there are inevitably errors in the material delivery amount between adjacent tanks, and the stable control of the delivery amount cannot be fully achieved. In the above scheme, a metering tank is set between the mixing device and the powder raw material tank, and the metering tank is used as an intermediate storage tank to improve the delivery stability; since a precise delivery device is set 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 amount.

[0031] 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;

[0032] The precision dosing unit is connected to the mixing device via a flexible hose.

[0033] 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.

[0034] 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 between the mixing device and the metering tank through a balance pipe.

[0035] 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.

[0036] Furthermore, the precise delivery unit is a feeding auger.

[0037] The beneficial effects of the present invention are:

[0038] 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.

[0039] 2. A stirring paddle is provided 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 provided in the mixing storage tank cooperates with each other to realize the circulation and mixing of the polyester slurry from multiple directions, thereby improving the uniformity of the polyester slurry.

[0040] 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, which realizes the precise delivery of powder raw materials and improves the delivery accuracy and stability of the polyester slurry mixing system.

[0041] 4. The feed chamber includes a guide portion and a discharge portion which are sequentially arranged along the extension direction of the funnel neck. The guide portion is arranged around the funnel neck so that the polyester diol in the guide portion and the powder raw material in the funnel body flow in the same direction and are mixed at a discharge port formed at the end of the discharge portion. Since there is a gap between the end of the funnel neck and the discharge port, a negative pressure is generated at the end of the funnel neck when the polyester diol in the feed chamber passes through the discharge port, which is beneficial to the discharge of the powder raw material and can more fully achieve the mixing of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the polyester slurry preparation system of the present invention.

[0043] Figure 2 It is a structural schematic diagram of the polyester slurry mixing device of the present invention.

[0044] Figure 3 for Figure 2 A front view of the mixing device shown.

[0045] Figure 4 for Figure 2 A top view of the mixing device is shown.

[0046] Figure 5 for Figure 4 A cross-sectional view of the mixing device shown at AA.

[0047] 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; 7211. funnel neck; 722. feeding section; 7221. guide part; 7222. discharge part; 723. mixing chamber; 724. guide pipe; 7241. feeding port. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The present invention provides a polyester slurry mixing device and a polyester slurry mixing system, such as Figures 1 to 5 As shown, the polyester slurry preparation system 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. 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.

[0052] The mixing device 72 includes a feed section 722 and a mixing chamber 723, and is connected to the mixing storage tank 3 through the mixing chamber 723;

[0053] The feed section 722 includes a feed chamber and a funnel body 721. The feed chamber is connected to the glycol delivery pipeline 7 and has a discharge port connected to the mixing chamber 723. The funnel body 721 is connected to the feed chamber and extends from the connection to the discharge port to form a funnel neck 7211. There is a gap between the end of the funnel neck 7211 and the discharge port.

[0054] In the above scheme, the mixing device 72 transports the polyester diol in the feed chamber to the discharge port along the extension direction of the funnel neck 7211. At the discharge port, the flow area of ​​the polyester diol is reduced due to the presence of the funnel neck 7211, and then a negative pressure is generated at the end of the funnel neck 7211, so that the powder raw material in the funnel body 721 can be smoothly mixed with the polyester diol under the influence of the negative pressure, thereby achieving preliminary mixing of the polyester slurry.

[0055] The following is a further detailed description with reference to specific embodiments.

[0056] Embodiment 1

[0057] As an embodiment of the present invention, this embodiment provides a polyester slurry mixing device, wherein a feed end includes a guide portion 7221 and a discharge portion 7222 which are sequentially arranged along an extension direction of a funnel neck 7211 .

[0058] In this embodiment, the guide portion 7221 is connected to the glycol delivery pipeline 7, and is arranged around the funnel neck 7211 to form an annular cavity; the discharge portion 7222 is connected to the guide portion 7221, and is gradually contracted along the extension direction of the funnel neck 7211 to form a discharge port at the contraction end; the contracted discharge portion 7222 allows the polyester glycol in the guide portion 7221 to pass through the discharge port at a higher speed, thereby increasing the flow rate of the polyester glycol and improving the mixing efficiency; the discharge portion 7222 gradually contracts along the extension direction of the funnel neck 7211 to make the funnel neck 721 1 is wrapped inside, and a discharge outlet is formed at the contraction end, which is connected to the mixing chamber 723 through the discharge outlet. Since the end of the funnel neck 7211 is close to the discharge outlet and there is a gap between the discharge outlet, a negative pressure is formed at the end of the funnel neck 7211 when the polyester diol passes through the discharge outlet, so that the powder raw material can be discharged smoothly and mixed with the polyester diol, thereby improving the mixing efficiency. Since the flow rate of the polyester diol and the powder raw material increases, the polyester diol can eliminate the agglomeration and adhesion between the powder raw materials during the flow process, thereby achieving sufficient mixing of the two.

[0059] In addition, the guide portion 7221 of the feed chamber is arranged around the funnel neck 7211, and the guide portion 7221 and the discharge portion 7222 are arranged in sequence along the length direction of the funnel neck 7211, so that the polyester diol and the powder raw material flow in the same direction, avoiding the intersection of the flow paths of the two resulting in a decrease in mixing uniformity, and also preventing the powder raw material from being unable to mix smoothly with the polyester diol due to the pressure difference, thereby improving the reliability of use.

[0060] Since the guide portion 7221 is arranged around the funnel neck 7211, in order to facilitate the connection between the guide portion 7221 and the diol delivery pipeline 7, the mixing device 72 also includes a guide pipe 724, one end of the guide pipe 724 is connected to the outer peripheral wall of the guide portion 7221, and the other end is connected to the diol delivery pipeline 7; in order to improve the uniformity of the polyester diol entering the guide portion 7221, a plurality of guide pipes 724 are arranged at equal intervals around the guide portion 7221, so that the feed amount of the polyester diol in all directions around the funnel neck 7211 is kept consistent. Since the polyester diol is evenly distributed, the negative pressure generated at the end of the funnel neck 7211 is also more uniform, which is conducive to the full mixing of the polyester diol and the powder raw material. In order to further improve the consistency of the delivery amount of polyester diol in each guide tube 724, multiple guide tubes 724 are arranged to converge at one end connected to the diol delivery pipeline 7, and a feed port 7241 is formed at the convergence. Through the feed port 7241, multiple guide tubes 724 are fed through the same feed port 7241, thereby avoiding uneven distribution of polyester diol in various directions of the guide part 7221 due to differences in feeding speed when each guide tube 724 is fed independently. In order to achieve consistent flow rate of each guide tube 724, the diameter of the guide tube 724 and the size of the feed port 7241 can be adjusted to achieve consistent flow rate in each guide tube 724.

[0061] Furthermore, the mixing chamber 723 is connected to the feeding section 722 through a discharge port formed at the end of the discharge portion 7222. The polyester diol and the powder raw material entering the mixing chamber 723 from the discharge port are fully mixed in the mixing chamber 723 and enter the mixing storage tank 3 through the mixing chamber 723. In order to improve the mixing ability of the mixing chamber 723, the cross-sectional area of ​​the mixing chamber 723 gradually increases in the direction away from the feeding section 722, and cooperates with the discharge portion 7222 to form a Venturi tube structure. The polyester diol carries the powder raw material into the mixing chamber 723 at a high flow rate, and after entering the mixing chamber 723, turbulence is generated due to the increase in flow area, thereby promoting the mixing of the polyester diol and the powder raw material, and improving the uniformity of the polyester slurry entering the mixing storage tank 3.

[0062] The present invention also provides a polyester slurry preparation system using the mixing device described in the above embodiment, which is specifically as follows.

[0063] Embodiment 2

[0064] As another embodiment of the present invention, this embodiment provides a polyester slurry preparation system, which adopts the mixing device as described in the first embodiment.

[0065] 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 funnel body 721 of the mixing device 72 through the precise delivery unit 4. The mixing chamber of the mixing device has a discharge port for discharging the mixed slurry. The mixing device is connected in series in the glycol delivery pipeline 7 through the feed port 7241 and the discharge port of the mixing chamber 723, thereby being able to achieve precise control of the amount of powder raw material delivered. Specifically, the precise delivery unit 4 of this embodiment is a feeding auger.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Furthermore, a nitrogen arch breaking system is provided in the metering tank 2 to prevent the powder raw materials 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 valves are selected from common gate valves, gate valves, butterfly valves, etc. in the field. Based on the known technical principles of the present invention, 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 also fall within the protection scope of the present invention.

[0073] Embodiment 3

[0074] As another embodiment of the present invention, this embodiment further makes the following improvements on the basis of the second embodiment.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] Embodiment 4

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 mixing device, characterized in that: It includes a feeding section and a mixing chamber which are interconnected; The feeding section includes a feeding chamber and a funnel body. The feeding chamber has a discharge port connected to the mixing chamber; the mixing chamber has a discharge port for discharging the polyester slurry. The funnel body is connected to the feeding chamber and extends from the connection to the discharge port to form a funnel neck. There is a gap between the end of the funnel neck and the discharge port.

2. The polyester slurry mixing device according to claim 1, characterized in that: The feeding section comprises a guide portion and a discharge portion which are sequentially arranged along the extension direction of the funnel neck, and the guide portion is arranged around the funnel neck to form an annular cavity; The discharge portion is communicated with the guide portion, gradually shrinks along the extension direction of the funnel neck to wrap the end of the funnel neck, and forms a discharge port at the contraction end, which is communicated with the mixing chamber through the discharge port.

3. The polyester slurry mixing device according to claim 2, characterized in that: The mixing device further comprises: A guide tube is connected to the guide portion and extends outwardly in a radial direction of the guide portion, and the annular cavity is connected to the outside through the guide tube; The mixing device has at least two guide tubes, and the connection positions of the plurality of guide tubes and the guide portion are evenly spaced along the axial direction of the guide portion; Preferably, the plurality of guide tubes are symmetrically arranged about the guide portion.

4. The polyester slurry mixing device according to claim 3, characterized in that: The other ends of the plurality of guide pipes converge to form a feed inlet.

5. The polyester slurry mixing device according to any one of claims 1 to 4, characterized in that: The cross-sectional area of ​​the mixing chamber gradually increases in a direction away from the feeding section.

6. A polyester slurry mixing system using the polyester slurry mixing and blending device according to any one of claims 1 to 5, 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 mixing device is connected in series in the glycol delivery pipeline through the feed port and the discharge port, and the powder raw material tank is connected to the funnel body; 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.

7. The polyester slurry preparation system according to claim 6, characterized in that: The powder raw material tank is connected with the funnel body of the mixing device through the precise delivery unit.

8. The polyester slurry preparation system according to claim 7, characterized in that: A metering tank is also provided between the powder raw material tank and the mixing device. 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 dosing unit is arranged between the mixing device and the powder outlet.

9. The polyester slurry preparation system according to claim 8, characterized in that: A weight sensor is also provided on the measuring tank, and the powder raw material tank and the measuring 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.

10. The polyester slurry preparation system according to claim 8, 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.

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