A polyester esterification temperature control device

Abstract

This utility model discloses a polyester esterification temperature control device, including a reaction vessel and a motor. The reaction vessel is equipped with a stirring rod connected to the motor. The reaction vessel is connected to a temperature sensing component and a temperature control component. The temperature sensing component includes a shell mounted on the reaction vessel, with a thermal expansion element disposed inside the shell. The thermal expansion element is slidably connected to a speed regulating element. The shell is equipped with a proximity switch that can cooperate with the thermal expansion element. The temperature control component includes a water pipe disposed on the outer wall of the reaction vessel, with a valve connected to a high-temperature pipe and a low-temperature pipe. The valve cooperates with the proximity switch. This utility model can achieve uniform temperature distribution inside the reaction vessel during the polyester esterification process, reduce the heating temperature of the reaction vessel, and remove heat from the reaction vessel, thereby cooling the reaction vessel and facilitating a better esterification reaction.

Description

Technical Field

[0001] This utility model relates to the field of temperature control technology for reaction vessels, and specifically to a temperature control device for polyester esterification. Background Technology

[0002] PEG-PCL microspheres are a widely used type of amphiphilic polymer microsphere that combines the properties of polyethylene glycol (PEG) and polycaprolactone (PCL), exhibiting excellent biocompatibility, biodegradability, and biosafety. These microspheres demonstrate superior performance in drug delivery, tissue engineering, and regenerative medicine, and their unique physicochemical properties make them promising for a wide range of applications in multiple fields.

[0003] The esterification temperature of PEG-PCL microspheres is usually between 47°C and 64°C to ensure the melting and flowability of PCL. The esterification reaction time depends on the specific reaction conditions, catalyst and required conversion rate, and usually takes several hours to several days.

[0004] A search revealed that patent CN 221619426 U discloses a constant temperature heating device for an esterification reactor, comprising a shell, three sets of support legs fixedly connected to the bottom of the shell, a discharge shell connected to the bottom of the shell, sliding grooves on the front and rear sides of the discharge shell's inner cavity, two discharge plates movably connected to the inner cavity of the discharge shell, the front and rear sides of the two discharge plates being movably connected to the inner wall of the discharge shell, and a positioning frame fixedly connected to the bottom of the front side of the discharge shell.

[0005] However, the device still has the following problems in use: when polyester materials are esterified, the chemical reaction itself will release a certain amount of heat. When heating, due to the lag in the detection of cylinder wall temperature, when the temperature is detected to be too high, it is difficult to ensure that the temperature is quickly reduced to the range required for esterification simply by stopping the heating. Utility Model Content

[0006] In order to solve the problems of heat release and temperature control during the esterification reaction of polyester materials in the prior art, this utility model provides a polyester esterification temperature control device to solve the problem of temperature control during the esterification of polyester materials.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] This utility model proposes a polyester esterification temperature control device, including a reaction vessel and a motor. The reaction vessel is equipped with a stirring rod connected to the motor. The reaction vessel is connected to a temperature sensing component and a temperature control component. The temperature sensing component includes a housing mounted on the reaction vessel, with a thermal expansion element disposed inside the housing. The thermal expansion element is slidably connected to a speed regulating element. The housing is equipped with a proximity switch that can cooperate with the thermal expansion element. The temperature control component includes a water pipe disposed on the outer wall of the reaction vessel, with a valve on the water pipe. The valve is connected to a high-temperature pipe and a low-temperature pipe, and the valve cooperates with the proximity switch.

[0009] Preferably, the thermal expansion element includes a first bimetallic strip and a second bimetallic strip, the first bimetallic strip being connected to a sliding sleeve, and the second bimetallic strip being connected to a push rod, wherein the sliding sleeve and the push rod can respectively cooperate with the speed regulating element.

[0010] Preferably, the upper end of the sliding sleeve is slidably connected to a sensing pin via an elastic element, the top rod is provided with a groove that can cooperate with the sensing pin, and a proximity switch is fixed on the side wall of the housing, the sensing pin being able to cooperate with the proximity switch.

[0011] Preferably, the interior of the housing is stepped, the first bimetallic strip is located in the middle of the housing, the second bimetallic strip is located at the bottom of the housing, and the top rod is sleeved inside the sliding sleeve.

[0012] Preferably, the speed regulating element includes a sliding rheostat, the sliding rheostat is connected to a top plate, the top plate is slidably connected to the housing, and the housing is provided with an alarm switch that can cooperate with the top plate.

[0013] Preferably, the temperature control component further includes a low-temperature tank, the low-temperature tube is located inside the low-temperature tank, the high-temperature tube is located outside the low-temperature tank, and the other ends of the low-temperature tube and the high-temperature tube converge to the water pipe, which is connected to a water tank.

[0014] Preferably, a valve core is slidably connected inside the valve, and the valve core is connected to a second electromagnet. The second electromagnet cooperates with the proximity switch, and the valve core can communicate with the high-temperature tube and the low-temperature tube respectively.

[0015] Preferably, the stirring rod is rotatably connected to an auxiliary stirring rod, the upper end of the auxiliary stirring rod is fixed with a gear, and the reaction vessel is slidably connected to a gear ring, which can cooperate with the gear.

[0016] Preferably, the reactor is fixedly connected to a first electromagnet, which is connected to the toothed ring and can cooperate with the proximity switch.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. By utilizing the principle of thermal expansion and contraction, and taking advantage of the temperature changes of two sets of bimetallic strips at different positions, the sliding rheostat can be adjusted to achieve the stirring speed in the reactor, thus ensuring a uniform temperature distribution within the reactor and facilitating a better esterification reaction.

[0019] 2. By setting an alarm switch and utilizing the temperature-dependent changes of two sets of bimetallic strips at different positions, the uneven temperature distribution after accelerated stirring can be avoided under the action of the sliding rheostat, thus preventing the esterification reaction quality from being affected.

[0020] 3. By using the proximity switch, the bimetallic strips in two different positions are affected by temperature changes. When the overall temperature inside the reactor is too high, the valve core moves to a lower position, reducing the heating temperature of the reactor and removing heat from the reactor, thus cooling the reactor and allowing the esterification reaction to proceed better. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the internal components of the shell in this utility model;

[0025] Figure 4 This is a schematic diagram of the valve core in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Reactor; 2. Water pipe; 3. Auxiliary stirring rod; 4. Gear; 5. Gear ring; 6. First electromagnet; 7. Shell; 8. Alarm switch; 9. Proximity switch; 10. Stirring rod; 11. High-temperature tube; 12. Second electromagnet; 13. Valve core; 14. Low-temperature tube; 15. Low-temperature bath; 16. Water tank; 17. Sliding rheostat; 18. Groove; 19. Sensing pin; 20. Sliding sleeve; 21. First bimetallic strip; 22. Push rod; 23. Second bimetallic strip; 24. Top plate. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] Example 1:

[0030] like Figure 1 - Figure 4 As shown in the figure, this embodiment proposes a polyester esterification temperature control device, including a reaction vessel 1. A stirring rod 10 is rotatably connected to the reaction vessel 1. The upper end of the stirring rod 10 extends out of the reaction vessel 1. A motor is connected to the upper end of the stirring rod 10. The motor is fixed on the reaction vessel 1. The motor can drive the stirring rod 10 to rotate, so as to achieve uniform material distribution in the reaction vessel 1.

[0031] Furthermore, to achieve better uniform material distribution, the stirring rod 10 is rotatably connected to at least two sets of symmetrically distributed auxiliary stirring rods 3. A gear 4 is fixed to the upper end of the auxiliary stirring rod 3. A first electromagnet 6 is fixedly connected to the reactor 1. The first electromagnet 6 is connected to a toothed ring 5 that can slide up and down. The toothed ring 5 can cooperate with the gear 4. When the first electromagnet 6 is working, the toothed ring 5 and the gear 4 mesh. While the auxiliary stirring rod 3 is driven by the stirring rod 10 to revolve, the auxiliary stirring rod 3 can also rotate on its own axis under the action of the toothed ring 5, so that the material distribution in the reactor 1 is more uniform, so as to better carry out the esterification reaction.

[0032] The outer wall of the reactor 1 is provided with a water pipe 2 for temperature adjustment. The water pipe 2 is spirally wound on the outer wall of the reactor 1 and is provided with a protective layer and a heat insulation layer. The spiral increases the contact area. The water pipe 2 is connected to a temperature control component for adjusting the temperature of the reactor 1.

[0033] The reactor 1 is fixedly connected to a shell 7. The shell 7 has a stepped cavity inside. A first bimetallic strip 21 is provided in the middle of the shell 7. The first bimetallic strip 21 is connected to a sliding sleeve 20 that can slide relative to the shell 7. A second bimetallic strip 23 is provided at the bottom of the shell 7. The second bimetallic strip 23 is connected to a push rod 22. The push rod 22 is inserted into the sliding sleeve 20 and can slide relative to the sliding sleeve 20. The ends of the sliding sleeve 20 and the push rod 22 are flush. A sliding rheostat 17 is fixed inside the shell 7. The slider of the sliding rheostat 17 is connected to a top plate 24. The top plate 24 can cooperate with the sliding sleeve 20 and the push rod 22. An alarm switch 8 that can cooperate with the top plate 24 is fixed on the side wall of the shell 7.

[0034] Specifically, the first bimetallic strip 21 and the second bimetallic strip 23 installed inside the housing 7 are thermal expansion elements, which change with temperature, thereby adjusting the position of the sliding sleeve 20 and the push rod 22 respectively.

[0035] Specifically, the first bimetallic strip 21 and the second bimetallic strip 23 are bimetallic temperature sensing elements. The bimetallic temperature sensing element is made of two metal strips with different coefficients of thermal expansion stacked together. When the temperature changes, the bimetallic strip will bend and deform due to the different coefficients of expansion of the two metals. The bimetallic temperature sensing element is usually wound into a spiral shape and installed in a protective sleeve. One end is fixed and called the fixed end, and the other end is connected to a thin shaft and called the free end.

[0036] Specifically, bimetallic strip temperature sensing elements are mature products on the market and are widely used in industries such as petroleum, chemical, metallurgy, textile, and food. In particular, bimetallic thermometers composed of bimetallic strip temperature sensing elements are mainly used in the chemical and petrochemical fields to measure the temperature in reaction vessels, pipelines, and storage tanks to ensure temperature control in chemical reactions and processing.

[0037] Specifically, the lower end of the first bimetallic strip 21 is fixedly connected to the housing 7, the upper end of the first bimetallic strip 21 is connected to the sliding sleeve 20, the lower end of the second bimetallic strip 23 is fixedly connected to the housing 7, and the upper end of the second bimetallic strip 23 is connected to the top rod 22.

[0038] Specifically, the sliding rheostat 17 is a mature product on the market and one of the commonly used devices in electrical engineering. Its working principle is to change the resistance by altering the length of the resistance wire connected to the circuit, thereby gradually changing the magnitude of the current in the circuit. The resistance wire of the sliding rheostat is generally made of a nickel-chromium alloy with a high melting point and high resistance, while the metal rod is generally made of a metal with low resistance. Therefore, when the cross-sectional area of ​​the resistor is constant, the longer the resistance wire, the greater the resistance; the shorter the resistance wire, the smaller the resistance, thus achieving control of electronic components.

[0039] Specifically, the sliding rheostat 17 is a speed regulating element for adjusting the speed of the motor. It is electrically connected to the motor used to control the rotation of the stirring rod 10 via wires. When the position of the top plate 24 changes, the sliding rheostat 17 adjusts the resistance value, thereby adjusting the rotation speed of the stirring rod 10.

[0040] Specifically, alarm switch 8 is electrically connected to an alarm via a wire. The alarm is a mature product on the market and is not shown in the diagram. The position of alarm switch 8 is the maximum temperature within the temperature range that the contents of reactor 1 can withstand.

[0041] Specifically, when the first bimetallic strip 21 is heated and expands, it can cause the sliding sleeve 20 to slide upward relative to the shell 7. The upward sliding of the sliding sleeve 20 causes the top plate 24 to move, which in turn causes the stirring rod 10 to rotate faster through the sliding rheostat 17, so as to achieve uniform material temperature in the reactor 1. If the temperature continues to rise, when the top plate 24 moves to the alarm switch 8 area, the alarm switch 8 can be activated to trigger the alarm, thereby preventing the local temperature of the material in the reactor 1 from being too high and affecting the esterification quality.

[0042] Specifically, when the second bimetallic strip 23 is heated and expands, it can cause the push rod 22 to move upward relative to the sliding sleeve 20. The push rod 22 causes the top plate 24 to move, which in turn causes the stirring rod 10 to rotate faster through the sliding rheostat 17, so as to achieve uniform material temperature in the reactor 1. If the temperature continues to rise, when the top plate 24 moves to the alarm switch 8 area, the alarm switch 8 can be activated to trigger the alarm, thereby preventing the material temperature in the reactor 1 from being too high locally and affecting the esterification quality.

[0043] Furthermore, to better ensure uniform material temperature within the reactor 1, a sensing pin 19 is slidably connected to the upper end of the sliding sleeve 20 via an elastic element. This elastic element is a spring, with one end connected to the sensing pin 19 and the other end connected to the sliding sleeve 20. The top rod 22 is provided with a groove 18 that can cooperate with the sensing pin 19. A proximity switch 9 that cooperates with the sensing pin 19 is fixed on the side wall of the housing 7. The proximity switch 9 is electrically connected to the first electromagnet 6 and the temperature control component for adjusting the temperature of the reactor 1 via a wire.

[0044] Specifically, when the push rod 22 moves upward, it causes the sliding rheostat 17 to work; when the sliding sleeve 20 moves upward, the sensing pin 19 slides into the groove 18 under the action of the spring, so that the sliding rheostat 17 works, while at the same time preventing the proximity switch 9 from working when only the sliding sleeve 20 moves upward.

[0045] Specifically, when the overall temperature of the material inside the reactor 1 is too high, the first bimetallic strip 21 and the second bimetallic strip 23 are heated simultaneously, causing the sliding sleeve 20 and the push rod 22 to move upwards simultaneously. First, the operation of the sliding rheostat 17 accelerates the rotation of the stirring rod 10. If the temperature continues to rise, the sensing pin 19 activates the proximity switch 9, which in turn activates the first electromagnet 6. The first electromagnet 6 causes the gear ring 5 to move downwards, enabling the gear ring 5 to mesh with the gear 4. This allows the auxiliary stirring rod 3 to rotate on its own axis while being driven by the stirring rod 10 to revolve around the reactor, making the material inside the reactor 1 more uniform and thus making the temperature inside the reactor 1 more uniform, so as to better adjust the temperature of the reactor 1.

[0046] Specifically, both alarm switch 8 and proximity switch 9 are non-contact position switches, which are mature products on the market and can be selected according to design requirements.

[0047] Specifically, non-contact position switches, also known as contactless proximity switches, are ideal electronic switching sensors. When a metal object approaches the sensing area of ​​the switch, the switch can quickly issue an electrical command without contact, pressure, or sparks, accurately reflecting the position and stroke of the moving mechanism. It has the characteristics of limit switches and micro switches, while also having sensing performance. It is reliable in operation, stable in performance, fast in frequency response, long in service life, strong in anti-interference ability, and has waterproof, shockproof, and corrosion-resistant features. It is widely used in machine tools, metallurgy, chemical industry, textile industry, and printing industry.

[0048] The temperature control component, which is simultaneously connected to water pipe 2 and proximity switch 9, includes a low-temperature tank 15. The low-temperature tank 15 is fixedly connected to a high-temperature pipe 11 located outside the low-temperature tank 15 and a low-temperature pipe 14 located inside the low-temperature tank 15. The low-temperature pipe 14 can be arranged in an S-shape inside the low-temperature tank 15 to fully cool the water passing through the low-temperature pipe 14. Both the high-temperature pipe 11 and the low-temperature pipe 14 can be connected to water pipe 2 through one-way valves. The high-temperature pipe 11 and the low-temperature pipe 14 are connected to a water tank 16 through a pipeline. This pipeline is connected to the water tank 16 through a valve. The valve is fixed on the upper cover of the low-temperature tank 15. A valve core 13 is slidably connected inside the valve. The valve core 13 is connected to a second electromagnet 12 that can cooperate with proximity switch 9. The second electromagnet 12 is also electrically connected to proximity switch 9 through a wire. The second electromagnet 12 can adjust the position of valve core 13 in both on and off states, so that valve core 13 can be connected to high-temperature pipe 11 or low-temperature pipe 14 by moving its position.

[0049] Specifically, the cryogenic bath 15 is a non-standard product, which is a mature technology product in the market. It can be customized according to the design specifications.

[0050] Specifically, the water tank 16 is equipped with a water pump, which is a mature product on the market and can be purchased according to needs. The water pipe 2 leaves the reactor 1 from the top and extends into the water tank 16. The water pump can send the water in the water tank 16 back into the water pipe 2 wrapped around the reactor 1, so that the temperature of the reactor 1 is adjusted when passing through the reactor 1.

[0051] Specifically, a heater is installed in the water tank 16, which can heat the water in the water tank 16 to the temperature required for the esterification of the material in the reactor 1, and can keep the water in the water tank 16 at a constant temperature.

[0052] Specifically, the heater is a mature product on the market and is connected to a power source, but it is not shown in the diagram.

[0053] Specifically, under normal conditions, valve core 13 connects water tank 16 to high-temperature pipe 11, allowing high-temperature water in water tank 16 to heat reactor 1 via water pipe 2. At the same time, under the action of the one-way valves of valve core 13 and low-temperature pipe 14, high-temperature water is prevented from entering low-temperature tank 15.

[0054] Specifically, when the proximity switch 9 is activated, the second electromagnet 12 is activated, causing the valve core 13 to move. This allows the valve core 13 to connect the water tank 16 to the low-temperature pipe 14. Under the action of the one-way valve in the valve core 13 and the high-temperature pipe 11, the high-temperature water in the water tank 16 flows to the low-temperature tank 15, thus cooling the water in the water pipe 2 that enters the reactor 1 area. The lower water temperature cools the reactor 1 through the water pipe 2 and removes the heat from the reactor 1, allowing the reactor 1 to cool down and better carry out the esterification reaction. This avoids damage to the materials inside the reactor 1 caused by high temperature. After the reactor 1 is cooled down, the sensing pin 19 will separate from the proximity switch 9. At this time, the first electromagnet 6 and the second electromagnet 12 will work synchronously in opposite directions, restoring the reactor 1 to the state during esterification.

[0055] Specifically, the top plate 24 is provided with an auxiliary spring for resetting. The elastic force of the auxiliary spring is less than the thrust generated by the thermal deformation of the first bimetallic strip 21 and the second bimetallic strip 23. The elastic force of the spring connected to the sensing pin 19 is also less than the thrust generated by the thermal deformation of the first bimetallic strip 21 and the second bimetallic strip 23, so that the sensing pin 19 can slide along the groove 18 conveniently and quickly.

[0056] Specifically, the first electromagnet 6, the second electromagnet 12, and the one-way valve are all mature products on the market and can be selected according to needs. The first electromagnet 6 and the second electromagnet 12 are both connected to a power source, which is not shown in the figure.

[0057] Working principle and usage process of this utility model:

[0058] S1: Water in water tank 16 that meets the esterification temperature of the material in reactor 1 is pumped into water pipe 2, flows through valve core 13 to high temperature pipe 11 and then enters water pipe 2 wound on reactor 1 to heat reactor 1.

[0059] S2: If the local temperature inside the reactor 1 is too high, the first bimetallic strip 21 or the second bimetallic strip 23 will expand due to heat, causing the sliding rheostat 17 to work and accelerate the rotation of the stirring rod 10 to achieve uniform temperature inside the reactor 1.

[0060] If the temperature still rises after the stirring rod 10 accelerates the stirring, the top plate 24 will activate the alarm switch 8 to trigger an alarm; thus preventing the local temperature of the material in the reactor 1 from becoming too high and affecting the esterification quality.

[0061] S3: If the overall temperature inside the reactor 1 is too high, the first bimetallic strip 21 and the second bimetallic strip 23 will be heated at the same time, causing the sliding rheostat 17 to work and accelerate the rotation of the stirring rod 10 to achieve uniform temperature inside the reactor 1.

[0062] If the temperature continues to rise, the sensing pin 19 connected to the sliding sleeve 20 and the proximity switch 9 will work. The proximity switch 9 will cause the first electromagnet 6 and the second electromagnet 12 to work simultaneously. The first electromagnet 6 will cause the gear ring 5 to mesh with the gear 4, so that the auxiliary stirring rod 3 will rotate while the stirring rod 10 revolves, making the stirring in the reactor 1 more uniform and achieving uniform temperature distribution. The second electromagnet 12 will cause the valve core 13 to move, so that the water in the water tank 16 will flow into the low temperature pipe 14 through the valve core 13. Under the action of the low temperature tank 15, the water will be cooled and then enter the water pipe 2 wound on the reactor 1 to cool the reactor 1.

[0063] S4: After the reactor 1 cools down, the sensing pin 19 separates from the proximity switch 9. At this time, the first electromagnet 6 and the second electromagnet 12 work in opposite directions synchronously, restoring the working state of the reactor 1 during esterification.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A polyester esterification temperature control device, comprising a reaction vessel (1) and a motor, wherein the reaction vessel (1) is provided with a stirring rod (10), the stirring rod (10) being connected to the motor, characterized in that: The reactor (1) is connected to a temperature sensing component and a temperature control component. The temperature sensing component includes a housing (7) disposed on the reactor (1). A thermal expansion element is disposed inside the housing (7). A speed regulating element is slidably connected to the thermal expansion element. A proximity switch (9) is disposed on the housing (7). The proximity switch (9) can cooperate with the thermal expansion element. The temperature control component includes a water pipe (2) disposed on the outer wall of the reactor (1). A valve is disposed on the water pipe (2). The valve is connected to a high-temperature pipe (11) and a low-temperature pipe (14). The valve cooperates with the proximity switch (9).

2. The polyester esterification temperature control device according to claim 1, characterized in that: The thermal expansion element includes a first bimetallic strip (21) and a second bimetallic strip (23). The first bimetallic strip (21) is connected to a sliding sleeve (20), and the second bimetallic strip (23) is connected to a push rod (22). The sliding sleeve (20) and the push rod (22) can respectively cooperate with the speed regulating element.

3. The polyester esterification temperature control device according to claim 2, characterized in that: The upper end of the sliding sleeve (20) is slidably connected to a sensing pin (19) via an elastic element. The top rod (22) is provided with a groove (18), which can cooperate with the sensing pin (19). A proximity switch (9) is fixed on the side wall of the housing (7), and the sensing pin (19) can cooperate with the proximity switch (9).

4. The polyester esterification temperature control device according to claim 2, characterized in that: The interior of the housing (7) is stepped, the first bimetallic strip (21) is located in the middle of the housing (7), the second bimetallic strip (23) is located at the bottom of the housing (7), and the top rod (22) is sleeved in the sliding sleeve (20).

5. The polyester esterification temperature control device according to claim 1, characterized in that: The speed regulating element includes a sliding rheostat (17), which is connected to a top plate (24). The top plate (24) is slidably connected to the housing (7). The housing (7) is provided with an alarm switch (8), which can cooperate with the top plate (24).

6. The polyester esterification temperature control device according to claim 1, characterized in that: The temperature control component also includes a low-temperature tank (15), the low-temperature tube (14) is located inside the low-temperature tank (15), the high-temperature tube (11) is located outside the low-temperature tank (15), and the other ends of the low-temperature tube (14) and the high-temperature tube (11) converge to the water pipe (2), and the water pipe (2) is connected to a water tank (16).

7. The polyester esterification temperature control device according to claim 6, characterized in that: The valve has a valve core (13) slidably connected inside, and the valve core (13) is connected to a second electromagnet (12). The second electromagnet (12) cooperates with the proximity switch (9), and the valve core (13) can be connected to the high temperature tube (11) and the low temperature tube (14) respectively.

8. The polyester esterification temperature control device according to claim 1, characterized in that: The stirring rod (10) is rotatably connected to an auxiliary stirring rod (3), and a gear (4) is fixed at the upper end of the auxiliary stirring rod (3). The reaction vessel (1) is slidably connected to a toothed ring (5), which can cooperate with the gear (4).

9. The polyester esterification temperature control device according to claim 8, characterized in that: The reactor (1) is fixedly connected to a first electromagnet (6), which is connected to the toothed ring (5). The first electromagnet (6) can cooperate with the proximity switch (9).

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