A constant temperature heating stirrer

Abstract

The application relates to the technical field of constant-temperature stirrers, in particular to a constant-temperature heating stirrer which comprises a heating base, a bath kettle fixed on the heating base, a reaction kettle erected in the bath kettle, and a stirring device erected above the reaction kettle and with a stirring end extending into the reaction kettle; the inside of the bath kettle is provided with a magnetic attraction scraping plate which is detachably attached to the inner wall; the outside of the bath kettle is provided with a magnetic attraction driving plate which is mutually attracted to the scraping plate; and a valve port is further arranged at the bottom of the bath kettle. The bath kettle and the base of the existing constant-temperature heating stirrer are fixed together, the bath kettle is difficult to operate when being cleaned, and cleaning and maintenance are inconvenient. The cleaning process is simplified, the labor intensity of the operator is reduced, and the equipment maintenance efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of thermostatic stirrer technology, and in particular to a thermostatic heating stirrer. Background Technology

[0002] A thermostatic stirrer is a commonly used laboratory device that combines precise temperature control with uniform stirring. It provides a stable temperature environment for liquid samples while simultaneously achieving mixing. Its basic components mainly include three parts: a heated and temperature-controlled bath containing a heat-conducting medium such as water or oil; a reaction vessel that holds the water or oil bath; and a stirring device for stirring the sample.

[0003] After a period of use, thermostatic stirrers require regular cleaning of the bath. Whether it's water or oil, long-term use will cause sediment to accumulate on the inner wall of the bath. This accumulated sediment forms scale, which prevents the heat generated by the heating element from being efficiently transferred to the heat transfer medium. The presence of scale can also create a localized electrochemical corrosion environment, leading to unstable temperature control and potentially causing the experimental or production process to go out of control, resulting in safety accidents. Therefore, maintenance procedures for thermostatic stirrers in laboratories require regular replacement of the heat transfer medium and cleaning of the bath. However, since the bath and heating base of most thermostatic stirrers on the market are fixed together, emptying the heat transfer medium requires lifting the entire base for handling, and internal cleaning requires repeatedly emptying the entire unit of wastewater. This cleaning process is cumbersome and difficult, making cleaning and maintenance inconvenient. Utility Model Content

[0004] Therefore, the purpose of this utility model is to overcome the shortcomings of existing constant temperature heating stirrers, where the bath pot is fixed to the base, making cleaning difficult and maintenance inconvenient. This utility model simplifies the cleaning process, reduces the labor intensity of operators, improves equipment maintenance efficiency, and reduces problems such as untimely maintenance due to inconvenient cleaning.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A constant temperature heating stirrer includes a heating base, a bath pot fixed on the heating base, a reaction vessel mounted in the bath pot, and a stirring device mounted above the reaction vessel with its stirring end extending into the reaction vessel. The bath pot has a magnetic scraper that is detachably attached to the inner wall, and a magnetic drive plate that is attracted to the scraper is provided on the outside of the bath pot. The bottom of the bath pot also has a valve port.

[0006] This application can be achieved by modifying the integrated heating bath in an existing constant-temperature heating stirrer. This facilitates maintenance during internal cleaning of the existing bath. Utilizing the principle of magnetic adsorption, the magnetic drive plate on the outside of the bath attracts the magnetic scraper that is detachably attached to the inner wall of the bath. When cleaning is required, the external magnetic drive plate is manually attached to the outside of the bath and moved in a circular motion, which moves the magnetic scraper along the inner wall of the bath, thereby scraping away the sediment and dirt attached to the inner wall. By opening the valve at the bottom of the bath, the heat transfer medium or wastewater inside the bath flows out naturally under gravity, achieving convenient and quick liquid discharge without having to lift and tilt the entire base. This greatly simplifies the cleaning process, reduces the labor intensity of operators, improves the efficiency of equipment maintenance, and reduces problems such as untimely maintenance that may be caused by inconvenient cleaning.

[0007] Furthermore, the magnetic scraper includes an integrally formed L-shaped magnetically pleasing metal plate and a first rubber layer that is wear-resistant and high-temperature resistant covering the outside of the L-shaped magnetically pleasing metal plate. The two ends of the L-shaped magnetically pleasing metal plate are respectively tightly attached to the inner bottom surface and the inner side wall of the bathtub. In this way, the two ends of the L-shaped scraper are tightly attached to the inner bottom surface and the inner side wall of the bathtub, perfectly adapting to the common cylindrical and flat-bottomed shapes of bathtubs, achieving complete coverage of the bottom surface and inner side wall. The internal magnetically pleasing metal plate serves as the core, ensuring stable adsorption and movement by the external magnetic drive plate; the externally covering high-temperature resistant and wear-resistant first rubber layer directly contacts the inner wall of the bathtub, preventing the metal from scratching the pot wall and enhancing the scraping force through the elasticity of the rubber conforming to the curvature of the pot wall.

[0008] Furthermore, the cross-section of the first rubber layer is triangular. The sharp sides of the triangle can create a cutting edge effect, concentrating the dispersed scraping force on the contact point, making it easier to peel off stubborn scale, and resulting in higher cleaning efficiency compared to rectangular or circular cross-sections.

[0009] Furthermore, the length of the end of the magnetic scraper that contacts the inner bottom surface of the bathtub is greater than the radius of the inner bottom surface of the bathtub but smaller than the diameter of the inner bottom surface of the bathtub. The distance between the end of the magnetic scraper that contacts the inner sidewall of the bathtub and the end of the bathtub is 0.5cm to 1cm from the end face of the bathtub. The length of the end of the magnetic scraper that contacts the inner bottom surface of the bathtub is greater than the radius of the inner bottom surface of the bathtub but smaller than the diameter of the inner bottom surface of the bathtub, allowing it to cover most of the bottom surface area when rotating, reducing blind spots, and providing greater stability during rotation. The distance between the end of the magnetic scraper that contacts the inner sidewall of the bathtub and the end face of the bathtub is 0.5cm to 1cm avoids the scraper colliding and getting stuck on the top edge of the bathtub, while still cleaning dirt close to the rim of the bathtub, balancing practicality and safety.

[0010] Furthermore, the magnetic drive plate includes a strip-shaped strong magnetic block, a second rubber layer covering the outside of the strip-shaped strong magnetic block, and a handle integrally formed with the second rubber layer. The strip-shaped strong magnetic block serves as the core magnetic source, forming a stable attraction with the magnetic scraper inside the bath through magnetic force. Utilizing the principle of magnetic coupling, the movement of the external drive plate can synchronously drive the movement of the internal magnetic scraper, achieving non-contact power transmission without penetrating the bath wall, thus avoiding the risk of leakage. The strip structure adapts to the force requirements of the L-shaped scraper, ensuring uniform magnetic force distribution and preventing the scraper from easily deviating during drive. The outer second rubber layer, on the one hand, avoids scratches caused by hard friction between the drive plate and the outer wall of the bath, and on the other hand, increases friction to prevent slippage when held. The integrally formed handle is ergonomic, providing a stable grip point for the operator and facilitating control of the direction of movement of the drive scraper.

[0011] Furthermore, the valve port includes a drain pipe located on the side wall of the bottom of the bathtub, and a valve located on the drain pipe. The drain pipe is located on the side wall of the bottom of the bathtub, rather than in the center, allowing the heat transfer medium or wastewater to flow along the bathtub wall to the pipe using gravity, reducing residue. The valve can be a ball valve, gate valve, or similar type, where the opening and closing of the valve core controls the flow of the pipe, enabling on-demand start and stop of medium discharge and preventing spillage during pouring.

[0012] Furthermore, the reactor is mounted above the bath via a first support platform. The first support platform includes a top plate that is sealed and abuts against the port of the bath, and support rods at the four corners of the top plate. The top plate has an mounting opening for placing the reactor. It should be noted that the top plate and the bath port are sealed together to form a closed space, reducing heat loss of the heat transfer medium inside the bath and improving the constant temperature efficiency; the four corner support rods provide stable support for the top plate, ensuring the overall load-bearing balance of the reactor after it is placed, and avoiding equipment shaking due to the shift of the center of gravity; the mounting opening on the top plate matches the size of the reactor, which not only fixes the position of the reactor and prevents the reactor body from shaking during stirring, but also allows the bottom of the reactor to be immersed in the heat transfer medium of the bath, ensuring that the reactor body is heated evenly.

[0013] Furthermore, the stirring device is mounted above the reactor via a lifting frame. The lifting frame includes a vertical frame fixed to the top plate, a first motor fixed to the end of the vertical frame, a screw connected at one end to the output end of the first motor, and a movable seat movably connected to the screw. The screw is parallel to the vertical frame and its other end is rotatably limited on the top plate. One end of the movable seat is slidably fitted onto the vertical frame. The stirring device is fixed to the movable seat. It should be noted that the first motor drives the screw to rotate, and the screw and the movable seat are threaded together to convert the rotational motion of the motor into the linear lifting motion of the movable seat. The vertical frame provides a sliding guide for the movable seat, preventing it from shifting as the screw rotates and ensuring stability during the lifting process. Through lifting adjustment, precise alignment of the stirring device and the reactor can be achieved. During the experiment, the stirring device is lowered so that the stirring blades extend into the reactor body. When removing or placing the reactor, the stirring device is raised to provide operating space, allowing the reactor body to be replaced without disassembling the stirring device.

[0014] Furthermore, the reaction vessel includes a vessel body and a sealing cover detachably connected to the port of the vessel body; the stirring device includes a second motor fixed on the movable base, a stirring rod connected at one end to the output end of the second motor, the other end of the stirring rod passing through the sealing cover into the vessel body, a stirring blade at the end of the stirring rod, and a sealing ring between the stirring rod and the stirring blade. The second motor drives the stirring blade to rotate through the stirring rod, utilizing the shearing and convection effects of the blades to achieve uniform mixing of materials inside the vessel. Combined with the constant temperature environment of the bath, this simultaneously meets the experimental requirements of heating and stirring. Furthermore, the sealing cover is fixedly connected to the stirring rod, and the sealing cover can detach from the vessel body when the stirring device is raised or lowered.

[0015] Furthermore, the heating base includes a base, a heating element disposed on the base and connected to the bottom of the bath, and a temperature control component disposed on the base and connected to the heating element. The heating element on the base provides a heat source for the bath, and the temperature control component monitors the bath temperature in real time and adjusts the heating power to form a closed-loop control, ensuring that the bath temperature remains stable at the set value and providing a constant heating environment for the reactor.

[0016] Furthermore, the heating element includes a heating plate, and the bottom of the bathtub is connected to the heating plate; Furthermore, the temperature control component can monitor the temperature in real time and adjust the working status of the heating element, including a temperature sensor, a temperature control mainboard, and a display and operation panel: Furthermore, the temperature sensor includes a first temperature sensor and a second temperature sensor. The first temperature sensor is inserted into the sealing cover and is used to measure the internal temperature of the vessel body, and the second sensor is inserted into the top plate and is used to measure the internal temperature of the bath. Furthermore, the temperature control mainboard receives the temperature signal from the sensor, compares it with the set temperature, and automatically controls the on / off state of the heating element or the heating power.

[0017] Furthermore, the display and operation panel is integrated at the front of the base, including a temperature display screen, setting buttons, and a start / stop switch, making it convenient for users to operate and observe.

[0018] Compared with the prior art, the beneficial effects of this utility model are: This application utilizes the principle of magnetic adsorption. The magnetic drive plate on the outside of the bath pot attracts the magnetic scraper that is detachably attached to the inner wall of the bath pot through magnetic force. When the bath pot needs to be cleaned, the external magnetic drive plate is manually attached to the outside of the bath pot and moved in a circular motion, which drives the magnetic scraper to move along the inner wall of the bath pot, thereby scraping away the sediment and dirt attached to the inner wall of the bath pot. The bottom of the bath pot opens the valve port, allowing the heat transfer medium or wastewater inside the bath pot to flow out naturally under the action of gravity, realizing convenient and quick liquid discharge. There is no need to lift and tilt the entire base, which greatly simplifies the cleaning process, reduces the labor intensity of operators, improves the efficiency of equipment maintenance, and reduces problems such as untimely maintenance that may be caused by inconvenient cleaning. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of a thermostatic heating stirrer in one embodiment; Figure 2 This is a schematic diagram of the magnetic scraper structure in one embodiment; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a three-dimensional structural diagram of a thermostatic heating stirrer in one embodiment; Figure 5 This is a cross-sectional schematic diagram of another state of the isothermal heating stirrer in one embodiment.

[0020] 1-Heating base, 2-Bath, 3-Reaction vessel, 31-Vessel body, 32-Sealing cover, 4-Stirring device, 41-Second motor, 42-Stirring rod, 43-Stirring blade, 5-Magnetic scraper, 51-L-shaped magnetic metal plate, 52-First rubber layer, 6-Magnetic drive plate, 7-Valve port, 8-First support platform, 81-Top plate, 82-Support rod, 811-Erection port, 9-Lifting frame, 91-Upright frame, 92-First motor, 93-Screw, 94-Movable seat, 100-First temperature sensor, 200-Second temperature sensor, 300-Display and operation panel. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Example 1 like Figure 1 As shown, a constant temperature heating stirrer includes a heating base 1, a bath 2 fixed on the heating base 1, a reaction vessel 3 mounted in the bath 2, and a stirring device 4 mounted above the reaction vessel 3 with its stirring end extending into the reaction vessel 3. The bath 2 has a magnetic scraper 5 that can be detachably attached to the inner wall, and a magnetic drive plate 6 that is attracted to the scraper on the outside of the bath 2. The bottom of the bath 2 also has a valve port 7.

[0025] This application can be obtained by modifying the integrated heating bath 2 in an existing constant temperature heating stirrer. This facilitates maintenance during internal cleaning of the existing bath 2. Utilizing the principle of magnetic adsorption, the magnetic drive plate 6 on the outside of the bath 2 attracts the magnetic scraper 5, which is detachably attached to the inner wall of the bath 2, through magnetic force. When cleaning the bath 2 is required, the external magnetic drive plate 6 is manually attached to the outside of the bath 2 and moved in a circular motion, which can drive the magnetic scraper 5 to move on the inner wall of the bath 2, thereby scraping away the sediment and dirt attached to the inner wall of the bath 2. The bottom of the bath 2 opens the valve port 7, allowing the heat transfer medium or wastewater inside the bath 2 to flow out naturally under gravity, which is convenient and quick to drain the liquid without having to lift and tilt the entire base. This greatly simplifies the cleaning process, reduces the labor intensity of operators, improves the efficiency of equipment maintenance, and reduces problems such as untimely maintenance that may be caused by inconvenient cleaning.

[0026] like Figure 2 and Figure 3 As shown, the magnetic scraper 5 includes an integrally formed L-shaped magnetically pleasing metal plate 51 and a wear-resistant and high-temperature resistant first rubber layer 52 covering the outside of the L-shaped magnetically pleasing metal plate 51. The two ends of the L-shaped magnetically pleasing metal plate 51 are respectively tightly attached to the inner bottom surface and the inner side wall of the bath pot 2. In this way, the two ends of the L-shaped scraper are respectively tightly attached to the inner bottom surface and the inner side wall of the bath pot 2, perfectly adapting to the common cylindrical and flat-bottomed three-dimensional shape of the bath pot 2, achieving no dead angle coverage of the bottom surface and the inner side wall. The internal magnetically pleasing metal plate serves as the core, ensuring that it can be stably attracted and moved by the external magnetic drive plate 6. The externally covered high-temperature resistant and wear-resistant first rubber layer 52 directly contacts the inner wall of the bath pot 2, which not only avoids the metal from scratching the pot wall, but also enhances the scraping force by conforming to the curvature of the pot wall through the elasticity of the rubber.

[0027] like Figure 3 As shown, the cross-section of the first rubber layer 52 is triangular. The sharp sides of the triangle can form a cutting edge effect, concentrating the dispersed scraping force on the contact point, making it easier to peel off stubborn scale. Compared with rectangular or circular cross-sections, the cleaning efficiency is higher.

[0028] like Figure 1 As shown, the length of the end of the magnetic scraper 5 that contacts the inner bottom surface of the bathtub 2 is greater than the radius of the inner bottom surface of the bathtub 2 but less than the diameter of the inner bottom surface of the bathtub 2. The distance between the end of the magnetic scraper 5 that contacts the inner sidewall of the bathtub 2 and the end face of the bathtub 2 is 0.5cm to 1cm. This design, with the length of the end of the magnetic scraper 5 that contacts the inner bottom surface of the bathtub 2 being greater than the radius of the inner bottom surface of the bathtub 2 but less than the diameter of the inner bottom surface of the bathtub 2, allows it to cover most of the bottom surface area when rotating, reducing blind spots and ensuring stability during rotation. The distance between the end of the magnetic scraper 5 that contacts the inner sidewall of the bathtub 2 and the end face of the bathtub 2 is 0.5cm to 1cm avoids the scraper from colliding and getting stuck on the top edge of the bathtub 2, while still cleaning dirt near the rim of the tub, balancing practicality and safety.

[0029] like Figure 1 As shown, the magnetic drive plate 6 includes a strip-shaped strong magnetic block, a second rubber layer covering the strip-shaped strong magnetic block, and a handle integrally formed with the second rubber layer. The strip-shaped strong magnetic block serves as the core magnetic source, forming a stable attraction with the magnetic scraper 5 inside the bathtub 2 through magnetic force. Utilizing the principle of magnetic coupling, the movement of the external drive plate synchronously drives the movement of the internal magnetic scraper 5, achieving non-contact power transmission without penetrating the wall of the bathtub 2, thus avoiding the risk of leakage. The strip structure adapts to the force requirements of the L-shaped scraper, ensuring uniform magnetic force distribution and preventing the scraper from easily deviating during drive. The outer second rubber layer, on the one hand, avoids scratches caused by hard friction between the drive plate and the outer wall of the bathtub 2, and on the other hand, increases friction to prevent slippage when held. The integrally formed handle is ergonomic, providing a stable grip point for the operator and facilitating control of the direction of movement of the drive scraper.

[0030] like Figure 4 As shown, the reactor 3 is mounted above the bath 2 via a first support platform 8. The first support platform 8 includes a top plate 81 that is sealed and abuts against the port of the bath 2, and support rods 82 that are supported at the four corners of the top plate 81. The top plate 81 has a mounting opening 811 for placing the reactor 3. It should be noted that the top plate 81 is sealed and abuts against the port of the bath 2, forming a closed space, which reduces the heat loss of the heat transfer medium in the bath 2 and improves the constant temperature efficiency; the four corner support rods 82 provide stable support for the top plate 81, ensuring the overall load-bearing balance of the reactor 3 after it is placed, and avoiding equipment shaking due to the shift of the center of gravity; the mounting port 811 on the top plate 81 matches the size of the reactor 3, which not only fixes the position of the reactor 3 and prevents the reactor body 31 from shaking during stirring, but also allows the bottom of the reactor 3 to be immersed in the heat transfer medium of the bath 2, ensuring that the reactor body 31 is heated evenly.

[0031] like Figure 4 As shown, the stirring device 4 is mounted above the reactor 3 via a lifting frame 9. The lifting frame 9 includes a vertical frame 91 fixed on the top plate 81, a first motor 92 fixed at the end of the vertical frame 91, a screw 93 connected at one end to the output end of the first motor 92, and a movable seat 94 movably connected to the screw 93. The screw 93 is parallel to the vertical frame 91 and its other end is rotatably limited on the top plate 81. One end of the movable seat 94 is slidably sleeved on the vertical frame 91. The stirring device 4 is fixed on the movable seat 94.

[0032] In this embodiment, in order to ensure the stability of the upright 91, an arc-shaped reinforcing base can be added to the bottom of the upright 91.

[0033] like Figure 5As shown, the first motor 92 drives the screw 93 to rotate. The screw 93 and the movable seat 94 are threaded together to convert the rotational motion of the motor into the linear lifting motion of the movable seat 94. The upright frame 91 forms a sliding guide for the movable seat 94 to prevent the movable seat 94 from shifting as the screw 93 rotates, thus ensuring the stability of the lifting process. Through lifting adjustment, the stirring device 4 and the reaction vessel 3 can be precisely aligned. During the experiment, the stirring device 4 is lowered so that the stirring blade 43 extends into the vessel body 31. When taking the reaction vessel 3 out, the stirring device 4 is raised to leave operating space. The vessel body 31 can be replaced without disassembling the stirring device 4.

[0034] like Figure 1 As shown, the reactor 3 includes a vessel body 31 and a sealing cover 32 that is detachably connected to the port of the vessel body 31. like Figure 5 As shown, the stirring device 4 includes a second motor 41 fixed on the movable base 94, a stirring rod 42 with one end connected to the output end of the second motor 41, the other end of the stirring rod 42 passing through the sealing cover 32 and entering the vessel body 31, the end of the stirring rod 42 is provided with a stirring blade 43, and a sealing ring is provided between the stirring rod 42 and the stirring blade 43.

[0035] In this way, the second motor 41 drives the stirring blade 43 to rotate through the stirring rod 42, and uses the shearing and convection of the blade to achieve uniform mixing of materials in the vessel. Combined with the constant temperature environment of the bath 2, it simultaneously meets the experimental requirements of heating and stirring. Furthermore, the sealing cover 32 is fixedly connected to the stirring rod 42, and the sealing cover 32 can follow the stirring device 4 and detach from the vessel body 31 when it is raised and lowered.

[0036] like Figure 1 As shown, the heating base 1 includes a base, a heating element disposed on the base and connected to the bottom of the bath 2, and a temperature control component disposed on the base and connected to the heating element. The heating element on the base provides a heat source for the bath 2, and the temperature control component monitors the bath temperature in real time and adjusts the heating power to form a closed-loop control, ensuring that the temperature of the bath 2 remains stable at the set value, thus providing a constant heating environment for the reaction vessel 3.

[0037] Example 2 This embodiment is similar to Embodiment 1, except that in this embodiment: Furthermore, the heating element includes a heating plate, and the bottom of the bathtub 2 is connected to the heating plate; like Figure 4 As shown, the temperature control component can monitor the temperature in real time and adjust the working status of the heating element, including a temperature sensor, a temperature control main board, and a display and operation panel 300. like Figure 4As shown, the temperature sensor includes a first temperature sensor 100 and a second temperature sensor 200. The first temperature sensor 100 is inserted into the sealing cover 32 and is used to measure the internal temperature of the vessel body 31. The second sensor is inserted into the top plate 81 and is used to measure the internal temperature of the bath 2. In this embodiment, the temperature control motherboard is used to receive the temperature signal from the sensor, compare it with the set temperature, and automatically control the on / off state of the heating element or the heating power.

[0038] like Figure 4 As shown, the display control panel 300 is integrated at the front of the base, including a temperature display screen, setting buttons, and start / stop switch, making it convenient for users to operate and observe.

[0039] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0040] Example 3 This embodiment is similar to Embodiment 1, except that in this embodiment: like Figure 1 As shown, valve port 7 includes a drain pipe opened on the side wall at the bottom of bath 2, and a valve provided on the drain pipe.

[0041] The drain pipe is located on the bottom side wall of the bath 2, rather than in the center. This allows the heat transfer medium or wastewater to flow along the bath wall to the pipe using gravity, reducing residue. Valves such as ball valves and gate valves can be used to control the opening and closing of the pipe, enabling on-demand start and stop of medium discharge and preventing spillage during pouring.

[0042] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A constant-temperature heating stirrer, comprising a heating base (1), a bath (2) fixed on the heating base (1), a reaction vessel (3) mounted in the bath (2), and a stirring device (4) mounted above the reaction vessel (3) with its stirring end extending into the reaction vessel (3), characterized in that, The bathtub (2) is provided with a magnetic scraper (5) that can be detachably attached to the inner wall. The bathtub (2) is provided with a magnetic drive plate (6) that is attracted to the scraper. The bottom of the bathtub (2) is also provided with a valve port (7).

2. The constant temperature heating stirrer according to claim 1, characterized in that, The magnetic scraper (5) includes an integrally formed L-shaped magnetic metal plate (51) and a first rubber layer (52) that is wear-resistant and high-temperature resistant covering the outside of the L-shaped magnetic metal plate (51). The two ends of the L-shaped magnetic metal plate (51) are respectively attached to the inner bottom surface and the inner side wall of the bath pot (2).

3. A constant-temperature heating stirrer according to claim 2, characterized in that, The cross-section of the first rubber layer (52) is triangular.

4. A constant-temperature heating stirrer according to claim 2, characterized in that, The length of the end of the magnetic scraper (5) that contacts the inner bottom surface of the bath pot (2) is greater than the radius of the inner bottom surface of the bath pot (2) and less than the diameter of the inner bottom surface of the bath pot (2). The end of the magnetic scraper (5) that contacts the inner side wall of the bath pot (2) is 0.5cm to 1cm away from the end face of the bath pot (2).

5. A constant-temperature heating stirrer according to claim 4, characterized in that, The magnetic drive plate (6) includes a strip-shaped strong magnetic block, a second rubber layer covering the outside of the strip-shaped strong magnetic block, and a handle integrally formed with the second rubber layer.

6. A constant-temperature heating stirrer according to claim 1, characterized in that, The valve port (7) includes a drain pipe opened on the side wall at the bottom of the bathtub (2) and a valve provided on the drain pipe.

7. A constant-temperature heating stirrer according to claim 1, characterized in that, The reactor (3) is mounted above the bath (2) via a first support platform (8). The first support platform (8) includes a top plate (81) that is sealed against the port of the bath (2) and support rods (82) at the four corners of the top plate (81). The top plate (81) has a mounting opening (811) for placing the reactor (3).

8. A constant-temperature heating stirrer according to claim 7, characterized in that, The stirring device (4) is mounted above the reactor (3) via a lifting frame (9). The lifting frame (9) includes a vertical frame (91) fixed on the top plate (81), a first motor (92) fixed at the end of the vertical frame (91), a screw (93) with one end connected to the output end of the first motor (92), and a movable seat (94) movably connected to the screw (93). The screw (93) is parallel to the vertical frame (91) and its other end is rotatably limited on the top plate (81). One end of the movable seat (94) is slidably sleeved on the vertical frame (91). The stirring device (4) is fixed on the movable seat (94).

9. A constant-temperature heating stirrer according to claim 8, characterized in that, The reactor (3) includes a vessel body (31) and a sealing cover (32) that is detachably connected to the port of the vessel body (31); the stirring device (4) includes a second motor (41) fixed on the movable seat (94), a stirring rod (42) connected at one end to the output end of the second motor (41), the other end of the stirring rod (42) passing through the sealing cover (32) and entering the vessel body (31), the end of the stirring rod (42) is provided with a stirring blade (43), and a sealing ring is provided between the stirring rod (42) and the stirring blade (43).

10. A constant-temperature heating stirrer according to claim 9, characterized in that, The heating base (1) includes a base, a heating element disposed on the base and connected to the bottom of the bathtub (2), and a temperature control component disposed on the base and connected to the heating element.

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