A polyester melt delivery device

Abstract

The utility model relates to a kind of polyester melt conveying devices, including melt booster pump, coolant conveying unit, cooling unit, heat medium conveying unit, stop valve, melt booster pump includes pump main body, front end cap and rear end cap, coolant conveying unit includes cold source, coolant conveying pipeline, coolant conveying pipeline includes first coolant inlet pipe, second coolant inlet pipe, coolant outlet pipe, first coolant inlet pipe opposite two ends are respectively communicated with cold source, front end cap import, second coolant inlet pipe opposite two ends are respectively communicated with front end cap export, rear end cap import, and coolant outlet pipe is communicated with rear end cap export;Cooling unit is located on second coolant inlet pipe, and cooling unit is used to cool the coolant passing through second coolant inlet pipe;Heat medium conveying component includes heat source, heat medium inlet pipe, heat medium outlet pipe, and stop valve is provided on heat medium inlet pipe.The polyester melt conveying device provided by the utility model is easy to collect after cooling, and has high safety;One cold source is set, coolant is fully utilized, and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to a polyester melt conveying device. Background Technology

[0002] The melt booster pump is a key piece of equipment for conveying melt in polyester plants, possessing excellent metering capabilities. The high-temperature melt booster pump consists of two gears, a pump body, and side covers, forming its feed zone, conveying zone, and discharge zone. During operation, the melt is conveyed by the change in working volume caused by the meshing of the driving gears. When the gears rotate in the specified direction, the melt enters the space between the teeth of the two gears in the feed zone, and then begins to rotate, carrying the melt from both sides into the conveying zone and pressurizing it to the outlet pipe. The bearings in the front and rear covers of the melt booster pump require high-temperature melt lubrication to prevent wear on the shaft and bearing bushes. Most of the high-temperature melt entering the pump body flows out of the pump body outlet, while a small amount is diverted into the front and rear covers respectively, lubricating the bearings in these covers before being discharged. The discharged melt is at a high temperature and requires a special container for collection. Collection is risky as it can easily splash and injure operators.

[0003] Gate valves are key pipeline control components in the heat transfer system of polyester plants, possessing excellent media blocking capabilities. The working principle of a gate valve is as follows: the rotation of the handwheel is converted into the linear up-and-down movement of the valve stem; relying on the pressure of the valve stem, the valve disc sealing surface and the valve seat sealing surface are tightly fitted, preventing media flow. Due to frequent operation of the gate valve, the threaded guide sleeve will wear, causing the valve stem position to become inaccurate, resulting in valve fluctuations during media transfer, posing potential risks to the transfer equipment and stable production. Utility Model Content

[0004] The purpose of this invention is to provide a polyester melt conveying device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A polyester melt conveying device includes a melt booster pump, a refrigerant conveying unit, a cooling unit, a heat medium conveying unit, and a shut-off valve. The melt booster pump includes a pump body, a front cover, and a rear cover, which are respectively located at the front and rear ends of the pump body. The refrigerant conveying unit includes a cold source and a refrigerant conveying pipeline. The cold source is used to supply refrigerant to the refrigerant conveying pipeline. The refrigerant conveying pipeline includes a first refrigerant inlet pipe, a second refrigerant inlet pipe, and a refrigerant outlet pipe. The opposite ends of the first refrigerant inlet pipe are respectively connected to the cold source and the inlet of the front cover. The opposite ends of the second refrigerant inlet pipe are respectively connected to the outlet of the front cover and the inlet of the rear cover. The refrigerant outlet pipe is connected to the outlet of the rear cover.

[0007] The cooling unit is installed on the second refrigerant inlet pipe, and the cooling unit is used to cool the refrigerant passing through the second refrigerant inlet pipe;

[0008] The heat medium delivery assembly includes a heat source, a heat medium inlet pipe, and a heat medium outlet pipe. The heat source is used to supply heat medium to the heat medium inlet pipe. The two ends of the heat medium inlet pipe are respectively connected to the heat source and the pump body inlet. The heat medium outlet pipe is connected to the pump body outlet. A shut-off valve is provided on the heat medium inlet pipe to control the opening and closing of the heat medium inlet pipe.

[0009] According to some embodiments of this utility model, the cooling unit is a finned heat sink.

[0010] According to some embodiments of this utility model, multiple cooling units are provided, and the multiple cooling units are arranged sequentially along the length direction of the second refrigerant inlet pipe.

[0011] According to some embodiments of this utility model, the two ends of the refrigerant outlet pipe are respectively connected to the outlet of the rear cover and the atmosphere; the refrigerant is compressed air.

[0012] According to some embodiments of this utility model, there is one cold source, multiple melt booster pumps, and the device further includes one or more branch pipes, each branch pipe corresponding to one of the remaining melt booster pumps after the first melt booster pump; the branch pipe corresponding to the second melt booster pump after the first melt booster pump is connected to the second refrigerant inlet pipe; the branch pipe corresponding to the next melt booster pump after the second melt booster pump is connected to the branch pipe corresponding to the previous melt booster pump, or the branch pipe corresponding to the melt booster pump after the second melt booster pump is connected to the second refrigerant inlet pipe.

[0013] According to some embodiments of this utility model, the branch pipeline includes a first inlet pipe, a first outlet pipe, and a second outlet pipe. The first inlet pipe is connected to the second refrigerant inlet pipe, the front end cap inlet of the melt booster pump, and the rear end cap inlet of the melt booster pump. The first outlet pipe is connected to the front end cap outlet of the melt booster pump, and the second outlet pipe is connected to the rear end cap outlet of the melt booster pump. Alternatively, the first inlet pipe of the branch pipeline corresponding to the next melt booster pump after the second melt booster pump is connected to the first inlet pipe of the branch pipeline corresponding to the previous melt booster pump.

[0014] According to some embodiments of the present invention, the device further includes a valve stem fixing unit, which is used to fix the valve core and valve stem of the shut-off valve to adjust the opening degree of the shut-off valve.

[0015] According to some embodiments of this utility model, the shut-off valve includes a valve body, a guide sleeve, a handwheel, and a valve core and valve stem. The guide sleeve is connected to the valve body, the valve core and valve stem are disposed in the guide sleeve and can move axially along the guide sleeve, the handwheel is connected to the valve core and valve stem, and openings are provided on opposite sides of the outer periphery of the guide sleeve, so that the valve stem of the valve core and valve stem is exposed at the openings.

[0016] The valve stem fixing unit includes an upper clamping plate, a lower clamping plate, a fixing member, a first fastener, and a second fastener. The upper clamping plate and the lower clamping plate are respectively disposed at the openings on opposite sides of the outer periphery of the guide sleeve. The fixing member is used to connect the upper clamping plate and the lower clamping plate. The first fastener is connected to the upper clamping plate, and one end of the first fastener passes through the upper clamping plate and abuts against the valve stem. The second fastener is located below the first fastener, and the second fastener is connected to the lower clamping plate. One end of the second fastener passes through the lower clamping plate and abuts against the valve stem.

[0017] According to some embodiments of the present invention, the first fastener includes a first bolt and a first nut. The shank of the first bolt, away from its head, passes through the upper clamping plate and abuts against the valve stem. The first nut is threadedly connected to the first bolt. The first nut is disposed on the side of the upper clamping plate away from the lower clamping plate.

[0018] The second fastener includes a second bolt and a second nut. The shank of the second bolt, away from its head, passes through the lower clamping plate and abuts against the valve stem. The second nut is threadedly connected to the second bolt and is located on the side of the lower clamping plate away from the upper clamping plate. The centerlines of the first bolt and the second bolt are both perpendicular to the central axis of the valve core and valve stem.

[0019] According to some embodiments of this utility model, the fixing member includes two bolt and nut assemblies. The bolt and nut assembly includes a fastening bolt and a fastening nut. The shank of the fastening bolt, away from its head, passes through the upper clamping plate and the lower clamping plate in sequence and extends out of the lower clamping plate by a certain distance. The fastening nut is located on the side of the lower clamping plate away from the upper clamping plate. The fastening bolt is parallel to the first bolt and the second bolt. Alternatively, one end of the fastening bolt passes through the upper clamping plate and the lower clamping plate in sequence. The two ends of the fastening bolt are respectively located on the side of the upper clamping plate away from the lower clamping plate and the side of the lower clamping plate away from the upper clamping plate. The fastening nut is provided at each end of the fastening bolt.

[0020] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0021] The polyester melt conveying device provided by this utility model has a cold source supplying refrigerant that enters the front cover through a first refrigerant inlet pipe to cool the bearings and melt inside the front cover. The cooled melt is then discharged as granules. The refrigerant enters the rear cover through a second refrigerant inlet pipe to cool the bearings and melt inside the rear cover. The cooled melt is then discharged as granules. The discharged granules are at a low temperature, easy to collect, and have high safety. By setting up a single cold source, the refrigerant can be fully utilized, improving the refrigerant utilization rate and reducing production costs. By setting up a valve stem fixing unit, the opening degree of the shut-off valve is ensured to be stable, ensuring the safety of equipment and workshop production. The valve stem fixing unit has a simple structure, is easy to operate, easy to install and disassemble, and has low manufacturing cost. It is stable and reliable, solving the problem of valve degree fluctuation in the shut-off valve of the polyester plant. Attached Figure Description

[0022] Appendix Figure 1 A structural diagram of the polyester melt conveying device provided by this utility model;

[0023] Appendix Figure 2 Another structural diagram of the polyester melt conveying device provided by this utility model;

[0024] Appendix Figure 3 Structural diagram of the shut-off valve and valve stem fixing unit of the polyester melt conveying device provided by this utility model;

[0025] Appendix Figure 4 A front view of the valve stem fixing unit (with valve stem installed) of the polyester melt conveying device provided by this utility model.

[0026] Appendix Figure 5 Front view of the valve stem fixing unit (without valve stem) of the polyester melt conveying device provided by this utility model.

[0027] Appendix Figure 6 A top view of the valve stem fixing unit of the polyester melt conveying device provided by this utility model;

[0028] Appendix Figure 7 A front view of the upper clamping plate and the first nut of the valve stem fixing unit of the polyester melt conveying device provided by this utility model;

[0029] Appendix Figure 8 This is a front view of the valve core of the gate valve;

[0030] Appendix Figure 9 This is a half-sectional view of the valve core of the shut-off valve.

[0031] Appendix Figure 10 This is a left view of the valve core of a gate valve.

[0032] In the attached diagrams above:

[0033] 1-First refrigerant inlet pipe; 2-Second refrigerant inlet pipe; 3-Refrigerant outlet pipe; 4-First inlet pipe; 41-First pipeline; 42-Second pipeline; 5-First outlet pipe; 6-Second outlet pipe; 7-Heat medium inlet pipe; 8-Heat medium outlet pipe; 9-Valve stem fixing unit; 91-Upper clamping plate; 92-Lower clamping plate; 93-Fixing component; 94-First bolt; 95-First nut; 96-Second bolt; 97-Second nut; 98-Fasting bolt; 99-Fasting nut; 101-Pump body; 102-Front end cover; 103-Rear end cover; 11-Cooling unit; 12-Stop valve; 121-Handwheel; 122-Valve core; 123-Valve stem; 124-Guide sleeve; 125-Valve body; 13-Valve. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] See Figures 1 to 10 The polyester melt conveying device shown includes a melt booster pump, a refrigerant conveying unit, a heat transfer unit, and a shut-off valve 12, wherein:

[0037] The melt booster pump includes a pump body 101, a front cover 102, and a rear cover 103, with the front cover 102 and rear cover 103 respectively located at the front and rear ends of the pump body 101. Bearings, shafts, and bearing bushes are installed inside the front cover 102 and rear cover 103, and a gear set is installed inside the pump body 101, through which the melt flows.

[0038] The refrigerant delivery unit includes a cold source and a refrigerant delivery pipeline. The cold source is used to supply refrigerant to the refrigerant delivery pipeline. The cold source is preferably compressed air. The refrigerant delivery pipeline includes a first refrigerant inlet pipe 1, a second refrigerant inlet pipe 2, and a refrigerant outlet pipe 3. The two ends of the first refrigerant inlet pipe 1 are respectively connected to the cold source and the inlet of the front cover 102. A first compressed air pipe is provided inside the front cover 102. The two ends of the first compressed air pipe are respectively connected to the first refrigerant inlet pipe 1 and the second refrigerant inlet pipe 2. The two ends of the second refrigerant inlet pipe 2 are respectively connected to the outlet of the front cover 102 and the inlet of the rear cover 103. The refrigerant outlet pipe 3 is connected to the outlet of the rear cover 103. A second compressed air pipe is provided inside the rear cover 103. The two ends of the second compressed air pipe are respectively connected to the second refrigerant inlet pipe 2 and the outlet of the rear cover 103.

[0039] In some embodiments, the two ends of the refrigerant outlet pipe 3 are respectively connected to the outlet of the rear cover 103 and the atmosphere, that is, the refrigerant flowing out from the outlet of the rear cover 103 is directly discharged into the atmosphere.

[0040] In some embodiments, two melt booster pumps are provided, one cold source is provided, and the device also includes a branch pipeline, which includes a first inlet pipe 4, a first outlet pipe 5, and a second outlet pipe 6. The first inlet pipe 4 includes a first pipe 41 and a second pipe 42 connected to each other. The opposite ends of the first refrigerant inlet pipe 1 are respectively connected to the cold source and the inlet of the front cover 102 of the first melt booster pump. The opposite ends of the second refrigerant inlet pipe 2 are respectively connected to the outlet of the front cover 102 of the melt booster pump and the inlet of the rear cover 103 of the melt booster pump. The refrigerant outlet pipe 3 is connected to the outlet of the rear end cover 103 of the melt booster pump; the two opposite ends of the first pipe 41 are respectively connected to the second refrigerant inlet pipe 2 and the inlet of the front end cover 102 of the second melt booster pump, the first outlet pipe 5 is connected to the outlet of the front end cover 102 of the second melt booster pump, the two opposite ends of the second pipe 42 are respectively connected to the second refrigerant inlet pipe 2 and the inlet of the rear end cover 103 of the second melt booster pump, and the second outlet pipe 6 is connected to the outlet of the rear end cover 103 of the second melt booster pump. Alternatively, the two opposite ends of the second pipe 42 are respectively connected to the first pipe 41 and the inlet of the rear end cover 103 of the second melt booster pump.

[0041] In this example, during device operation, compressed air first enters the front cover 102 through the first refrigerant inlet pipe 1 to cool the corresponding spiral seals (bearings, shafts, bearing bushes) and melt inside the front cover 102 (the cooled melt becomes particles and is discharged from the front cover 102). The discharged gas then passes through the second refrigerant inlet pipe 2 and is cooled by the cooling unit 11. The cooled compressed air enters the rear cover 103 to cool the corresponding spiral seals (bearings, shafts, bearing bushes) and melt inside the rear cover 103 (the cooled melt becomes particles and is discharged from the rear cover 103). The discharged particles are at a low temperature, easy to collect, and have high safety. The refrigerant can be fully utilized to improve the utilization rate of compressed air and reduce production costs.

[0042] When there are more than two melt booster pumps, the device includes multiple branch pipes, each corresponding to one of the remaining melt booster pumps after the first melt booster pump. The branch pipe corresponding to the second melt booster pump after the first melt booster pump is connected to the second refrigerant inlet pipe 2. Among the remaining melt booster pumps after the second melt booster pump, the branch pipe corresponding to the next melt booster pump is connected to the branch pipe corresponding to the previous melt booster pump; or the branch pipe is connected to the second refrigerant inlet pipe 2 (the branch pipes corresponding to the remaining melt booster pumps after the second melt booster pump can be connected to the second refrigerant inlet pipe 2).

[0043] The sub-pipeline includes a first inlet pipe 4, a first outlet pipe 5, and a second outlet pipe 6. The first inlet pipe 4 is connected to the second refrigerant inlet pipe 2, the inlet of the front cover 102 of the melt booster pump, and the inlet of the rear cover 103 of the melt booster pump. The first outlet pipe 5 is connected to the outlet of the front cover 102 of the melt booster pump, and the second outlet pipe 6 is connected to the outlet of the rear cover 103 of the melt booster pump. Alternatively, among the remaining melt booster pumps located after the second melt booster pump, the first inlet pipe 4 of the sub-pipeline corresponding to the next melt booster pump is connected to the first inlet pipe 4 of the sub-pipeline corresponding to the previous melt booster pump.

[0044] In this example, a single cold source can be installed, and multiple melt booster pumps can be set up to fully utilize compressed air, thereby improving compressed air utilization and reducing production costs. A cooling unit 11 is installed on the branch pipeline in this example.

[0045] The heat transfer assembly includes a heat source, a heat transfer inlet pipe 7, and a heat transfer outlet pipe 8. The heat source is used to supply heat transfer medium to the heat transfer inlet pipe 7. The heat transfer medium is a medium for heating the melt and is heat transfer oil. The two ends of the heat transfer inlet pipe 7 are respectively connected to the heat source and the inlet of the pump body 101. The heat transfer outlet pipe 8 is connected to the outlet of the pump body 101. The function of the heat transfer medium is to heat the melt entering the pump body and keep it at a high temperature.

[0046] In some embodiments, the device further includes a cooling unit 11, which is disposed on the second refrigerant inlet pipe 2. The cooling unit 11 is used to cool the refrigerant passing through the second refrigerant inlet pipe 2, and the cooled refrigerant is delivered to the rear end cover 103 of the melt booster pump.

[0047] Preferably, the cooling unit 11 is a finned radiator. Multiple cooling units 11 are provided, and the multiple cooling units 11 are arranged sequentially along the length direction of the second refrigerant inlet pipe 2, which can improve the cooling effect.

[0048] In some embodiments, the two ends of the refrigerant outlet pipe 3 are respectively connected to the outlet of the rear cover 103 and the atmosphere; valves 13 are provided on the first refrigerant inlet pipe 1 and the second refrigerant inlet pipe 2.

[0049] A shut-off valve 12 is installed on the heat medium inlet pipe 7, which is used to control the opening and closing of the heat medium inlet pipe 7.

[0050] In some embodiments, the device further includes a valve stem fixing unit 9, which is used to fix the valve core and valve stem connection of the shut-off valve 12 to adjust the opening degree of the shut-off valve 12.

[0051] See Figure 8-10 In this example, the shut-off valve 12 includes a valve body 125, a guide sleeve 124, a handwheel 121, and a valve core and valve stem. The threaded guide sleeve 124 is connected to the valve body 125, and the handwheel 121 is connected to the valve core and valve stem. The valve core and valve stem include a valve core 122 and a valve stem 123. The valve core 122 is disposed on the valve stem 123, and the valve stem 123 is disposed inside the guide sleeve 124 and can move axially along the guide sleeve 124. Openings are provided on opposite sides of the outer periphery of the guide sleeve 124, so that the valve stem 123 is exposed at the openings.

[0052] In some implementations, see Figure 3-5 The valve stem fixing unit 9 includes an upper clamping plate 91, a lower clamping plate 92, a fixing member 93, a first fastener, and a second fastener. The upper clamping plate 91 is located above the lower clamping plate 92. The upper clamping plate 91 and the lower clamping plate 92 are respectively disposed at the openings on opposite sides of the outer periphery of the guide sleeve 124, that is, the upper clamping plate 91 and the lower clamping plate 92 are opposite to each other. The valve core and valve stem are located between the upper clamping plate 91 and the lower clamping plate 92. The extending direction of the upper clamping plate 91 is parallel to the extending direction of the lower clamping plate 92. The upper clamping plate 91 and the lower clamping plate 92 are... The extension direction of the upper clamping plate 91 is perpendicular to the central axis of the valve core and valve stem; the fixing member 93 is used to connect the upper clamping plate 91 and the lower clamping plate 92; the first fastener is connected to the upper clamping plate 91, and one end of the first fastener passes through the upper clamping plate 91 and abuts against the upper part of the valve stem 123; the second fastener is located below the first fastener, and the second fastener is connected to the lower clamping plate 92, and one end of the second fastener passes through the lower clamping plate 92 and abuts against the lower part of the valve stem 123, wherein the extension direction of the upper clamping plate 91 and the lower clamping plate 92 is perpendicular to the central axis of the valve core and valve stem.

[0053] In some embodiments, the first fastener includes a first bolt 94 and a first nut 95. The shank of the first bolt 94, away from the head, passes through the upper clamping plate 91 and abuts against the valve stem 123. The first nut 95 is threadedly connected to the first bolt 94 and is located on the side of the upper clamping plate 91 away from the lower clamping plate 92.

[0054] The second fastener includes a second bolt 96 and a second nut 97. The shank of the second bolt 96, away from the head, passes through the lower clamping plate 92 and abuts against the valve stem 123. The second nut 97 is threadedly connected to the second bolt 96. The second nut 97 is located on the side of the lower clamping plate 92 away from the upper clamping plate 91. The center lines (e.g., Z-axis) of the first bolt 94 and the second bolt 96 are perpendicular to the center line (e.g., X-axis) of the valve core and valve stem.

[0055] In some embodiments, the fastener 93 includes two bolt and nut assemblies, each comprising a fastening bolt 98 and a fastening nut 99. The shank of the fastening bolt 98, at the end furthest from its head, passes sequentially through the upper clamping plate 91 and the lower clamping plate 92, extending a distance beyond the lower clamping plate 92. The fastening nut 99 is located on the side of the lower clamping plate 92 furthest from the upper clamping plate 91. The fastening bolt 98 is parallel to the first bolt 94 and the second bolt 96. Alternatively, one end of the fastening bolt 98 passes sequentially through the upper clamping plate 91 and the lower clamping plate 92, with both ends of the fastening bolt 98 located on the side of the upper clamping plate 91 furthest from the lower clamping plate 92 and the side of the lower clamping plate 92 furthest from the upper clamping plate 91, respectively. A fastening nut 99 is provided at each end of the fastening bolt 98.

[0056] The specific implementation method of adjusting the opening of the shut-off valve 12 by the valve stem fixing unit 9 in this example is as follows: If one end of the first bolt 94 is abutting against one side of the valve stem 123 and one end of the second bolt 96 is abutting against the other side of the valve stem 123, first loosen the first nut 95 and the second nut 97, then move one end of the first bolt 94 and one end of the second bolt 96 away from the valve stem 123. After the valve core and valve stem have moved a certain distance (i.e., the shut-off valve 12 is opened to the required position), move one end of the first bolt 94 and one end of the second bolt 96 towards the valve core and valve stem until they abut against the valve stem 123. Finally, tighten the first nut 95 and the second nut 97.

[0057] In this example, the polyester melt conveying device ensures stable valve opening by setting a valve stem fixing unit, thus guaranteeing equipment and workshop production safety. The valve stem fixing unit has a simple structure, is easy to operate, easy to install and disassemble, and has low manufacturing cost. It is stable and reliable, solving the problem of valve opening fluctuation.

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A polyester melt conveying device, characterized in that, The system includes a melt booster pump, a refrigerant delivery unit, a cooling unit, a heat transfer unit, and a shut-off valve. The melt booster pump includes a pump body, a front cover, and a rear cover, which are respectively located at the front and rear ends of the pump body. The refrigerant delivery unit includes a cold source and a refrigerant delivery pipeline. The cold source provides refrigerant to the refrigerant delivery pipeline. The refrigerant delivery pipeline includes a first refrigerant inlet pipe, a second refrigerant inlet pipe, and a refrigerant outlet pipe. The opposite ends of the first refrigerant inlet pipe are respectively connected to the cold source and the inlet of the front cover. The opposite ends of the second refrigerant inlet pipe are respectively connected to the outlet of the front cover and the inlet of the rear cover. The refrigerant outlet pipe is connected to the outlet of the rear cover. The cooling unit is installed on the second refrigerant inlet pipe, and the cooling unit is used to cool the refrigerant passing through the second refrigerant inlet pipe; The heat medium delivery assembly includes a heat source, a heat medium inlet pipe, and a heat medium outlet pipe. The heat source is used to supply heat medium to the heat medium inlet pipe. The two ends of the heat medium inlet pipe are respectively connected to the heat source and the pump body inlet. The heat medium outlet pipe is connected to the pump body outlet. A shut-off valve is provided on the heat medium inlet pipe to control the opening and closing of the heat medium inlet pipe.

2. The polyester melt conveying device according to claim 1, characterized in that, The cooling unit is a finned heat sink.

3. The polyester melt conveying device according to claim 1, characterized in that, Multiple cooling units are provided, and the multiple cooling units are arranged sequentially along the length direction of the second refrigerant inlet pipe.

4. The polyester melt conveying device according to claim 1, characterized in that, The two ends of the refrigerant outlet pipe are respectively connected to the outlet of the rear cover and the atmosphere; the refrigerant is compressed air.

5. The polyester melt conveying device according to claim 1, characterized in that, The device includes one cold source, multiple melt booster pumps, and one or more branch pipes. Each branch pipe corresponds to one of the remaining melt booster pumps after the first melt booster pump. The branch pipe corresponding to the second melt booster pump after the first melt booster pump is connected to the second refrigerant inlet pipe. The branch pipe corresponding to the next melt booster pump after the second melt booster pump is connected to the branch pipe corresponding to the previous melt booster pump, or the branch pipe corresponding to the melt booster pump after the second melt booster pump is connected to the second refrigerant inlet pipe.

6. The polyester melt conveying device according to claim 5, characterized in that, The branch pipeline includes a first inlet pipe, a first outlet pipe, and a second outlet pipe. The first inlet pipe is connected to the second refrigerant inlet pipe, the front end cap inlet of the melt booster pump, and the rear end cap inlet of the melt booster pump. The first outlet pipe is connected to the front end cap outlet of the melt booster pump, and the second outlet pipe is connected to the rear end cap outlet of the melt booster pump. Alternatively, the first inlet pipe of the branch pipeline corresponding to the next melt booster pump after the second melt booster pump is connected to the first inlet pipe of the branch pipeline corresponding to the previous melt booster pump.

7. The polyester melt conveying device according to claim 1, characterized in that, The device further includes a valve stem fixing unit, which is used to fix the valve core and valve stem of the shut-off valve to adjust the opening degree of the shut-off valve.

8. The polyester melt conveying device according to claim 7, characterized in that, The shut-off valve includes a valve body, a guide sleeve, a handwheel, and a valve core and valve stem. The guide sleeve is connected to the valve body. The valve core and valve stem are disposed inside the guide sleeve and can move axially along the guide sleeve. The handwheel is connected to the valve core and valve stem. Openings are provided on opposite sides of the outer periphery of the guide sleeve, so that the valve stem of the valve core and valve stem is exposed at the openings. The valve stem fixing unit includes an upper clamping plate, a lower clamping plate, a fixing member, a first fastener, and a second fastener. The upper clamping plate and the lower clamping plate are respectively disposed at the openings on opposite sides of the outer periphery of the guide sleeve. The fixing member is used to connect the upper clamping plate and the lower clamping plate. The first fastener is connected to the upper clamping plate, and one end of the first fastener passes through the upper clamping plate and abuts against the valve stem. The second fastener is located below the first fastener, and the second fastener is connected to the lower clamping plate. One end of the second fastener passes through the lower clamping plate and abuts against the valve stem.

9. The polyester melt conveying device according to claim 8, characterized in that, The first fastener includes a first bolt and a first nut. The shank of the first bolt, away from its head, passes through the upper clamping plate and abuts against the valve stem. The first nut is threadedly connected to the first bolt and is located on the side of the upper clamping plate away from the lower clamping plate. The second fastener includes a second bolt and a second nut. The shank of the second bolt, away from its head, passes through the lower clamping plate and abuts against the valve stem. The second nut is threadedly connected to the second bolt and is located on the side of the lower clamping plate away from the upper clamping plate. The centerlines of the first bolt and the second bolt are both perpendicular to the central axis of the valve stem.

10. The polyester melt conveying device according to claim 9, characterized in that, The fastener includes two bolt and nut assemblies, each comprising a fastening bolt and a fastening nut. The shank of the fastening bolt, at the end furthest from its head, passes sequentially through the upper and lower clamping plates and extends a distance beyond the lower clamping plate. The fastening nut is located on the side of the lower clamping plate furthest from the upper clamping plate. The fastening bolt is parallel to the first and second bolts. Alternatively, one end of the fastening bolt passes sequentially through the upper and lower clamping plates, with both ends of the fastening bolt located on the side of the upper clamping plate furthest from the lower clamping plate and the side of the lower clamping plate furthest from the upper clamping plate, respectively. The fastening nut is located at each end of the fastening bolt.

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