A heat exchanger with protective function for biodiesel preparation

Abstract

The invention discloses a heat exchanger with a protective function for preparing biodiesel, relates to the technical field of heat exchangers, comprises a heat exchange device, and also comprises a protective device, wherein a control device is fixedly installed on the front side of the heat exchange device, a liquid inlet pipe is fixedly installed on the left side of the heat exchange device, and a placement frame is fixedly installed on the left side of the heat exchange device, wherein the protective device comprises a connecting pipe, an adjusting hole, an adjusting frame, an L-shaped rod, a protective groove, a rotating rod, a protective plate and a limiting groove, the L-shaped rod moves upward to break away from the contact with the adjusting hole and releases the limit on the connecting pipe, after the limit on the connecting pipe is released, the connecting pipe is manually pushed to move in a direction close to the oil storage tank for docking, and the protective plate can effectively prevent the connecting pipe from being loosened or displaced due to the operator accidentally touching the L-shaped rod, thereby reducing the risk of leakage or accidents.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to a heat exchanger with a protective function for preparing biodiesel. Background Art

[0002] The heat exchanger with protective function used for biodiesel preparation is usually composed of a shell, heat exchange tubes, end covers, partitions, temperature control devices, safety devices, insulation layers and cleaning and maintenance devices, and the heat exchanger is often used to heat crude oil to increase its temperature.

[0003] The patent with the patent announcement number CN216115580U relates to a heat exchanger with protective function for biodiesel preparation, including a heat exchange box, a partition vertical plate installed in the middle of the inner wall of the heat exchange box, transverse partition plates installed on both sides of the heat exchange box, a cooling fan installed on the top of the transverse partition plate, a heat dissipation window opened at one end of one side of the heat exchange box, a cooling window opened at the other end of one side of the heat exchange box, and a cooling fan installed at one end of the cooling window. The patent uses a cooling fan fixedly installed in the middle of the top of the transverse partition plate inside the heat dissipation cavity to dissipate the temperature inside the device or equipment, and the hot air inside the equipment enters the heat dissipation cavity from the heat dissipation window through the heat dissipation fan, and is guided through the transverse partition plate and discharged from the heat dissipation outlet, so as to facilitate rapid cooling of the device, avoid the inability to fully cool the inside of the device, and reduce the excessive temperature of the device or equipment, thereby reducing the abnormal processing of the equipment.

[0004] The above-mentioned heat dissipation fan guides the hot air inside the equipment into the heat dissipation cavity through the heat dissipation window and is guided by the horizontal partition plate to be discharged from the heat dissipation outlet, so as to facilitate rapid cooling of the device, avoid the inability to fully cool down the inside of the equipment, reduce the excessive temperature of the equipment or device and cause abnormal equipment processing. However, it is difficult to adjust the pipeline distance between the heat exchange equipment and the oil storage tank. The fixed pipeline distance will lead to improper space utilization and limit the reasonable layout of the heat exchange equipment, thereby causing damage to the pipeline connection points and increasing the risk of heat exchange equipment failure. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a heat exchanger with a protective function for preparing biodiesel, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A heat exchanger with a protective function for preparing biodiesel, comprising a heat exchange device and a protective device, wherein a control device is fixedly installed on the front side of the heat exchange device, a liquid inlet pipe is fixedly installed on the left side of the heat exchange device, and a placement frame is fixedly installed on the left side of the heat exchange device, wherein the protective device comprises a connecting pipe, an adjusting hole, an adjusting frame, an L-shaped rod, a protective groove, a rotating rod, a protective plate and a limiting groove, the L-shaped rod moves upward to break away from the contact with the adjusting hole and releases the limit on the connecting pipe, after the limit of the connecting pipe is released, the connecting pipe is manually pushed to move in a direction close to the oil storage tank for docking, the connecting pipe is slidably installed on the inner wall of the liquid inlet pipe, the adjusting hole is provided on the circumferential surface of the connecting pipe, the adjusting frame is fixedly installed on the circumferential surface of the liquid inlet pipe, the L-shaped rod slides through the upper and lower walls of the adjusting frame, the protective groove is provided on the circumferential surface of the L-shaped rod, the rotating rod rotates through the upper and lower walls of the adjusting frame, the protective plate is fixedly installed on the circumferential surface of the rotating rod, and the limiting groove is provided on the surface of the protective plate.

[0007] According to the above technical solution, an adjustment spring is provided between the adjustment frame and the L-shaped rod, and the adjustment spring can drive the L-shaped rod to reset, the control device is electrically connected to the heat exchange equipment, and the protective plate is in contact with the protective groove.

[0008] According to the above technical solution, a clockwork spring is arranged between the adjustment frame and the rotating rod, one end of the clockwork spring is arranged on the top of the inner wall of the adjustment frame, and the other end is arranged on the circumferential surface of the rotating rod. The clockwork spring can drive the rotating rod to reset, and the L-shaped rod is in contact with the inner wall of the adjustment hole, and a limiting ring is fixedly installed on the circumferential surface of the L-shaped rod.

[0009] According to the above technical scheme, a protective device for supporting the connecting pipe is provided on the surface of the placement frame, and an auxiliary device is provided on the inner wall of the liquid inlet pipe. The protective device includes a resistance frame, a resistance plate, a resistance hole, an L-shaped plate, a U-shaped frame, a support frame and a linkage block. The resistance plate can only move slowly so that the L-shaped plate moves slowly, the L-shaped plate moves slowly so that the U-shaped frame moves slowly, and the U-shaped frame moves slowly so that the connecting pipe can only move slowly when it is adjusted to dock. The resistance frame is fixedly installed on the inner wall of the placement frame, the resistance plate is slidably installed on the inner wall of the resistance frame, the resistance hole is opened on the surface of the resistance plate, the L-shaped plate is fixedly installed on the side of the resistance plate away from the heat exchange equipment, the U-shaped frame is fixedly installed on the circumferential surface of the connecting pipe, the support frame is fixedly installed on the front and rear sides of the L-shaped plate, and the linkage block is fixedly installed on the side of the resistance plate close to the heat exchange equipment.

[0010] According to the above technical solution, the L-shaped plate contacts the inner wall of the U-shaped frame, liquid is arranged inside the resistance frame, the resistance plate moves to squeeze the liquid inside the resistance frame, and the support frame contacts the connecting pipe.

[0011] According to the above technical scheme, the auxiliary device includes a filter plate, a linkage rod, a linkage gear block, a load-bearing rod, a load-bearing gear, a cleaning rod and an arc panel. The rotation of the load-bearing gear drives the load-bearing rod to rotate, and the rotation of the load-bearing rod drives the cleaning rod to rotate. The cleaning rod rotates to scrape the left side of the filter plate. The filter plate is fixedly installed on the inner wall of the liquid inlet pipe, the linkage rod slides through the inner and outer walls of the resistance frame, the linkage gear block is fixedly installed on the rear side of the linkage rod, the load-bearing rod rotates and penetrates the left and right walls of the filter plate, the load-bearing gear is fixedly installed on the circumferential surface of the load-bearing rod, the cleaning rod is fixedly installed on the circumferential surface of the load-bearing rod, and the arc panel is fixedly installed on the right side of the filter plate.

[0012] According to the above technical solution, a No. 1 spring is arranged between the linkage rod and the resistance frame, one end of the No. 1 spring is arranged on the inner wall of the resistance frame, and the other end is arranged on the surface of the linkage rod. The No. 1 spring can drive the linkage rod to reset, the arc panel is elastic, and the linkage tooth block is meshed with the load-bearing gear.

[0013] According to the above technical solution, the cleaning rod contacts the filter plate, the arc panel contacts the load-bearing gear, and the side of the linkage rod close to the linkage block is set as an inclined surface, through which the linkage rod can be squeezed to move upward.

[0014] The present invention provides a heat exchanger with a protective function for preparing biodiesel, which has the following beneficial effects:

[0015] (1) The heat exchanger with a protective function for preparing biodiesel can manually rotate the protective plate clockwise to disengage from the contact with the protective groove, and the protective plate can be rotated clockwise to release the limit on the L-shaped rod. The protective plate can effectively prevent the loosening or displacement of the connecting pipe caused by the operator accidentally touching the L-shaped rod, thereby reducing the risk of leakage or accidents and ensuring the safety of the operating environment and the heat exchange equipment. The L-shaped rod is moved upward to disengage from the contact with the adjustment hole and release the limit on the connecting pipe. After the limit of the connecting pipe is released, the connecting pipe is manually pushed to move toward the oil storage tank for docking. The adjustable distance of the connecting pipe allows the layout to be flexibly adjusted according to actual space conditions. By reasonably adjusting the length of the connecting pipe, the stress concentration caused by improper length of the connecting pipe can be reduced, thereby reducing the risk of leakage and protecting the heat exchange equipment.

[0016] (2) The heat exchanger with protective function for biodiesel preparation drives the support frame to move in the direction close to the oil storage tank by the L-shaped plate. The movement of the support frame continuously supports the connecting pipe. The support frame can effectively reduce the vibration and displacement of the connecting pipe during operation, thereby ensuring the stability of the connection. The slow movement of the L-shaped plate causes the U-shaped frame to move slowly. The slow movement of the U-shaped frame causes the connecting pipe to move slowly when it is adjusted for docking. The slow movement of the connecting pipe helps the operator to better control the docking process, thereby improving the accuracy of docking and ensuring the sealing and stability of the connection.

[0017] (3) The heat exchanger with protective function for biodiesel preparation drives the load-bearing rod to rotate through the rotation of the load-bearing gear, and the rotation of the load-bearing rod drives the cleaning rod to rotate. The cleaning rod rotates to scrape the left side of the filter plate. By keeping the filter plate clean, the fluidity of the raw material can be improved. Regular cleaning can prevent the filter plate from being blocked, thereby ensuring the stable operation of the heat exchange equipment and improving the performance of the entire heat exchange device. The vibration of the load-bearing gear drives the load-bearing rod to vibrate, and the vibration of the load-bearing rod drives the cleaning rod to resonate together. Through resonance, the cleaning rod can generate a larger vibration amplitude, thereby enhancing the cleaning effect on the surface of the filter plate, effectively removing deposited dirt and impurities, and further ensuring the efficient operation of the heat exchange process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the liquid inlet pipe of the present invention;

[0020] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement of part A;

[0021] Figure 4 For the present invention Figure 2 A schematic diagram of the structure of part B in the middle is enlarged;

[0022] Figure 5 This is a schematic diagram of the internal structure of the resistance frame of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of the structure of part C in the middle;

[0024] Figure 7 It is a schematic diagram of the position structure of the resistance plate and the L-shaped plate of the present invention.

[0025] In the figure: 1. heat exchange equipment; 2. control device; 3. liquid inlet pipe; 4. placement frame; 5. connecting pipe; 6. adjustment hole; 7. adjustment frame; 8. L-shaped rod; 9. protection groove; 10. rotating rod; 11. protection plate; 12. limit groove; 13. adjustment spring; 141. resistance frame; 142. resistance plate; 143. resistance hole; 144. L-shaped plate; 145. U-shaped frame; 146. support frame; 147. linkage block; 151. filter plate; 152. linkage rod; 153. linkage gear block; 154. load-bearing rod; 155. load-bearing gear; 156. cleaning rod; 157. arc panel. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 4 One embodiment of the present invention is: a heat exchanger with a protective function for preparing biodiesel, comprising a heat exchange device 1, and also comprising a protective device, wherein a control device 2 is fixedly installed on the front side of the heat exchange device 1, a liquid inlet pipe 3 is fixedly installed on the left side of the heat exchange device 1, and a placement frame 4 is fixedly installed on the left side of the heat exchange device 1, wherein the protective device comprises a connecting pipe 5, an adjustment hole 6, an adjustment frame 7, an L-shaped rod 8, a protective groove 9, a rotating rod 10, a protective plate 11 and a limiting groove 12, and the connecting pipe 5 is slidably installed on the inner wall of the liquid inlet pipe 3 The adjusting hole 6 is provided on the circumferential surface of the connecting pipe 5, the adjusting frame 7 is fixedly installed on the circumferential surface of the liquid inlet pipe 3, the L-shaped rod 8 slides through the upper and lower walls of the adjusting frame 7, the protective groove 9 is provided on the circumferential surface of the L-shaped rod 8, the rotating rod 10 rotates through the upper and lower walls of the adjusting frame 7, the protective plate 11 is fixedly installed on the circumferential surface of the rotating rod 10, and the limiting groove 12 is provided on the surface of the protective plate 11. By reasonably adjusting the length of the connecting pipe 5, the stress concentration caused by the improper length of the connecting pipe 5 can be reduced, thereby reducing the risk of leakage and protecting the heat exchange equipment 1.

[0028] An adjusting spring 13 is arranged between the adjusting frame 7 and the L-shaped rod 8. The adjusting spring 13 can drive the L-shaped rod 8 to reset. The control device 2 is electrically connected to the heat exchange equipment 1. The protective plate 11 is in contact with the protective groove 9. The protective plate 11 can effectively prevent the L-shaped rod 8 from loosening or displacement caused by the operator accidentally touching it, thereby reducing the risk of leakage or accidents.

[0029] A clockwork spring is arranged between the adjustment frame 7 and the rotating rod 10, one end of the clockwork spring is arranged on the top of the inner wall of the adjustment frame 7, and the other end is arranged on the circumferential surface of the rotating rod 10. The clockwork spring can drive the rotating rod 10 to reset, and the L-shaped rod 8 contacts the inner wall of the adjustment hole 6, and a limiting ring is fixedly installed on the circumferential surface of the L-shaped rod 8.

[0030] When the present embodiment is working: when the heat exchange device 1 is docked with the oil storage tank, first manually rotate the protection plate 11 clockwise, the protection plate 11 rotates clockwise to drive the rotating rod 10 to rotate, the rotating rod 10 rotates to squeeze the spring, the spring is squeezed by the rotating rod 10 to produce deformation and accumulate force, at the same time, the protection plate 11 rotates clockwise to break away from the contact with the protection groove 9, the protection plate 11 rotates clockwise to break away from the contact with the protection groove 9 and release the limit on the L-shaped rod 8, after the limit of the L-shaped rod 8 is released, manually pull the L-shaped rod 8 to move upward, the L-shaped rod 8 moves upward to squeeze the adjusting spring 13, the adjusting spring 13 is squeezed by the L-shaped rod 8 to produce deformation and accumulate force, at the same time, the L-shaped rod 8 moves upward to break away from the adjusting hole 6 Contact and release the limit on the connecting pipe 5. After the limit on the connecting pipe 5 is released, manually push the connecting pipe 5 toward the direction close to the oil tank for docking. When the connecting pipe 5 moves to a suitable position, release the L-shaped rod 8 so that it moves downward and resets under the elastic force of the adjusting spring 13. The L-shaped rod 8 moves downward and resets to contact the inner wall of the adjusting hole 6 and restore the limit on the connecting pipe 5. After the L-shaped rod 8 moves downward and resets, the protective groove 9 is aligned with the protective disk 11. After the protective groove 9 is aligned with the protective disk 11, the rotating rod 10 rotates counterclockwise under the action of the clockwork spring. The rotating rod 10 rotates counterclockwise to drive the protective disk 11 to rotate counterclockwise and contact the protective groove 9. The protective disk 11 contacts the protective groove 9 and restores the limit on the L-shaped rod 8.

[0031] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, a protective device for supporting the connecting pipe 5 is provided on the surface of the placement frame 4, and an auxiliary device is provided on the inner wall of the liquid inlet pipe 3. The protective device includes a resistance frame 141, a resistance plate 142, a resistance hole 143, an L-shaped plate 144, a U-shaped frame 145, a support frame 146 and a linkage block 147. The resistance frame 141 is fixedly mounted on the inner wall of the placement frame 4, the resistance plate 142 is slidably mounted on the inner wall of the resistance frame 141, the resistance hole 143 is opened on the surface of the resistance plate 142, the L-shaped plate 144 is fixedly mounted on the side of the resistance plate 142 away from the heat exchange device 1, the U-shaped frame 145 is fixedly mounted on the circumferential surface of the connecting pipe 5, the support frame 146 is fixedly mounted on the front and rear sides of the L-shaped plate 144, and the linkage block 147 is fixedly mounted on the side of the resistance plate 142 close to the heat exchange device 1. The support frame 146 can effectively reduce the vibration and displacement of the connecting pipe 5 during operation, thereby ensuring the stability of the connection.

[0032] The L-shaped plate 144 contacts the inner wall of the U-shaped frame 145, liquid is set inside the resistance frame 141, the resistance plate 142 moves to squeeze the liquid inside the resistance frame 141, and the support frame 146 contacts the connecting pipe 5. The slow movement of the connecting pipe 5 helps the operator to better control the docking process, thereby improving the accuracy of the docking.

[0033] The auxiliary device includes a filter plate 151, a linkage rod 152, a linkage gear block 153, a load-bearing rod 154, a load-bearing gear 155, a cleaning rod 156 and an arc panel 157. The filter plate 151 is fixedly installed on the inner wall of the liquid inlet pipe 3, the linkage rod 152 slides through the inner and outer walls of the resistance frame 141, the linkage gear block 153 is fixedly installed on the rear side of the linkage rod 152, the load-bearing rod 154 rotates and penetrates the left and right walls of the filter plate 151, the load-bearing gear 155 is fixedly installed on the circumferential surface of the load-bearing rod 154, the cleaning rod 156 is fixedly installed on the circumferential surface of the load-bearing rod 154, and the arc panel 157 is fixedly installed on the right side of the filter plate 151. Regular cleaning can prevent the filter plate 151 from being blocked, thereby ensuring the stable operation of the heat exchange equipment 1.

[0034] A No. 1 spring is arranged between the linkage rod 152 and the resistance frame 141. One end of the No. 1 spring is arranged on the inner wall of the resistance frame 141, and the other end is arranged on the surface of the linkage rod 152. The No. 1 spring can drive the linkage rod 152 to reset. The arc panel 157 is elastic, and the linkage gear block 153 is meshed with the load-bearing gear 155. Through resonance, the cleaning rod 156 can generate a larger vibration amplitude, thereby enhancing the cleaning effect on the surface of the filter plate 151.

[0035] The cleaning rod 156 is in contact with the filter plate 151, the arc panel 157 is in contact with the load-bearing gear 155, and the side of the linkage rod 152 close to the linkage block 147 is set as an inclined surface, through which the linkage rod 152 can be squeezed to move upward, a rubber ring is set between the linkage rod 152 and the resistance frame 141, and a rubber strip is set between the linkage rod 152 and the liquid inlet pipe 3. The rubber ring can increase the sealing between the linkage rod 152 and the resistance frame 141, and the rubber strip can increase the sealing between the linkage rod 152 and the liquid inlet pipe 3.

[0036] When the present embodiment is working, the connecting pipe 5 moves toward the direction close to the oil storage tank, driving the U-shaped frame 145 to move, the U-shaped frame 145 moves to contact the L-shaped plate 144 and squeezes the L-shaped plate 144, the L-shaped plate 144 is squeezed by the U-shaped frame 145 and moves toward the direction close to the oil storage tank, the L-shaped plate 144 moves toward the direction close to the oil storage tank, driving the support frame 146 to move, the support frame 146 moves to continuously support the connecting pipe 5, and at the same time the L-shaped plate 144 moves toward the direction close to the oil storage tank, driving the resistance plate 142 to move, and the resistance plate 144 moves toward the direction close to the oil storage tank. The movement of 42 squeezes the liquid inside the resistance frame 141, and the liquid inside the resistance frame 141 is squeezed by the resistance plate 142 and can only flow slowly through the resistance hole 143. The liquid inside the resistance frame 141 can only flow slowly through the resistance hole 143, which makes the resistance plate 142 move slowly, and the resistance plate 142 can only move slowly, which makes the L-shaped plate 144 move slowly, and the L-shaped plate 144 moves slowly, which makes the U-shaped frame 145 move slowly, and the U-shaped frame 145 moves slowly, which makes the connecting pipe 5 move slowly when it is adjusted to dock.

[0037] The L-shaped plate 144 moves toward the direction close to the oil storage tank, driving the resistance plate 142 to move. The movement of the resistance plate 142 drives the linkage block 147 to move. The linkage block 147 moves out of contact with the linkage rod 152. After the linkage rod 152 is out of contact with the linkage block 147, the linkage rod 152 moves downward under the elastic force of the No. 1 spring. The linkage rod 152 moves downward and drives the linkage tooth block 153 to move downward. The linkage tooth block 153 moves downward to squeeze the load-bearing gear 155. The load-bearing gear 155 is squeezed by the linkage tooth block 153 and rotates. The rotation of the load-bearing gear 155 drives the load-bearing rod 154 to rotate. The rotation of the load-bearing rod 154 drives the cleaning rod 156 to rotate. The cleaning rod 156 rotates to clean the left side of the filter plate 151. The load-bearing gear 155 rotates and contacts the arc panel 157 to generate vibration. The vibration of the load-bearing gear 155 drives the load-bearing rod 154 to vibrate. The vibration of the load-bearing rod 154 drives the cleaning rod 156 to resonate together. When the connecting pipe 5 moves toward the direction close to the heat exchange equipment 1 and resets, the connecting pipe 5 moves to drive the U-shaped frame 145 and the L-shaped plate 144 to move. The movement of the L-shaped plate 144 drives the resistance plate 142 and the linkage block 147 to move. The linkage block 147 moves to contact the linkage rod 152 and squeezes the linkage rod 152. The linkage rod 152 is squeezed by the linkage block 147 and moves upward. The linkage rod 152 moves upward to squeeze the No. 1 spring. The No. 1 spring is squeezed by the linkage rod 152 to deform and accumulate force.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger with a protective function for preparing biodiesel, comprising a heat exchange device (1), characterized in that: It also includes protective gear; Wherein, a control device (2) is fixedly installed on the front side of the heat exchange device (1), a liquid inlet pipe (3) is fixedly installed on the left side of the heat exchange device (1), and a placement frame (4) is fixedly installed on the left side of the heat exchange device (1); The protective device comprises a connecting pipe (5), an adjusting hole (6), an adjusting frame (7), an L-shaped rod (8), a protective groove (9), a rotating rod (10), a protective plate (11) and a limiting groove (12); the connecting pipe (5) is slidably mounted on the inner wall of the liquid inlet pipe (3); the adjusting hole (6) is formed on the circumferential surface of the connecting pipe (5); the adjusting frame (7) is fixedly mounted on the circumferential surface of the liquid inlet pipe (3); the L-shaped rod (8) slidably penetrates the upper and lower walls of the adjusting frame (7); the protective groove (9) is formed on the circumferential surface of the L-shaped rod (8); the rotating rod (10) rotates to penetrate the upper and lower walls of the adjusting frame (7); the protective plate (11) is fixedly mounted on the circumferential surface of the rotating rod (10); and the limiting groove (12) is formed on the surface of the protective plate (11); Wherein, a protective device for supporting the connecting pipe (5) is provided on the surface of the placement frame (4), and an auxiliary device is provided on the inner wall of the liquid inlet pipe (3).

2. The heat exchanger with protective function for preparing biodiesel according to claim 1, characterized in that: An adjustment spring (13) is provided between the adjustment frame (7) and the L-shaped rod (8), the control device (2) is electrically connected to the heat exchange device (1), and the protection plate (11) is in contact with the protection groove (9).

3. The heat exchanger with protective function for preparing biodiesel according to claim 2, characterized in that: A spring is provided between the adjustment frame (7) and the rotating rod (10); the L-shaped rod (8) is in contact with the inner wall of the adjustment hole (6); and a limit ring is fixedly mounted on the circumferential surface of the L-shaped rod (8).

4. The heat exchanger with protective function for preparing biodiesel according to claim 3, characterized in that: The protection device comprises a resistance frame (141), a resistance plate (142), a resistance hole (143), an L-shaped plate (144), a U-shaped frame (145), a support frame (146) and a linkage block (147); the resistance frame (141) is fixedly mounted on the inner wall of the placement frame (4); the resistance plate (142) is slidably mounted on the inner wall of the resistance frame (141); the resistance hole (143) is provided on the surface of the resistance plate (142); the L-shaped plate (144) is fixedly mounted on a side of the resistance plate (142) away from the heat exchange device (1); the U-shaped frame (145) is fixedly mounted on the circumferential surface of the connecting pipe (5); the support frame (146) is fixedly mounted on the front and rear sides of the L-shaped plate (144); and the linkage block (147) is fixedly mounted on a side of the resistance plate (142) close to the heat exchange device (1).

5. The heat exchanger with protective function for preparing biodiesel according to claim 4, characterized in that: The L-shaped plate (144) is in contact with the inner wall of the U-shaped frame (145), liquid is provided inside the resistance frame (141), and the support frame (146) is in contact with the connecting pipe (5).

6. The heat exchanger with protective function for preparing biodiesel according to claim 5, characterized in that: The auxiliary device comprises a filter plate (151), a linkage rod (152), a linkage gear block (153), a load-bearing rod (154), a load-bearing gear (155), a cleaning rod (156) and an arc panel (157); the filter plate (151) is fixedly mounted on the inner wall of the liquid inlet pipe (3); the linkage rod (152) slides through the inner and outer walls of the resistance frame (141); the linkage gear block (153) is fixedly mounted on the rear side of the linkage rod (152); the load-bearing rod (154) rotates through the left and right walls of the filter plate (151); the load-bearing gear (155) is fixedly mounted on the circumferential surface of the load-bearing rod (154); the cleaning rod (156) is fixedly mounted on the circumferential surface of the load-bearing rod (154); and the arc panel (157) is fixedly mounted on the right side of the filter plate (151).

7. A heat exchanger with a protective function for preparing biodiesel according to claim 6, characterized in that: A No. 1 spring is provided between the linkage rod (152) and the resistance frame (141); the arc panel (157) is elastic; and the linkage tooth block (153) is meshed with the load-bearing gear (155).

8. The heat exchanger with protective function for preparing biodiesel according to claim 7, characterized in that: The cleaning rod (156) contacts the filter plate (151), the arc plate (157) contacts the load-bearing gear (155), and a side of the linkage rod (152) close to the linkage block (147) is configured as an inclined surface.

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