Cooling circulation system for 4, 6-dichloropyrimidine production

Abstract

The utility model discloses a cooling circulation system for 4, 6-dichloropyrimidine production, which comprises a box body and a temporary storage box, an isolation device is arranged in the box body, the isolation device comprises a fixed box and a first hydraulic cylinder, the fixed box is fixedly connected with the inner surface of the box body, the first hydraulic cylinder is fixedly connected with the inner surface of the fixed box, and the temporary storage box is fixedly connected with the fixed box. According to the cooling circulation system for 4, 6-dichloropyrimidine production, through cooperation of an isolation device and a water tank, a water pump pumps out water in a water return pipe and a cooling pipe and then discharges the water into the water tank, cooling liquid in the water tank can be conveyed into the cooling pipe through a straight pipe while the water is discharged, the cooling liquid in the water tank is conveyed into the cooling pipe through the straight pipe, and the cooling liquid in the water tank is cooled. The crystallization kettle can be rapidly cooled and crystallized by being placed on the surface of the groove box, water in the water tank is blocked through a rubber plate, water can circulate in a low-temperature state, the cooling efficiency is higher, and the practicability of the device is improved.

Description

Technical field:

[0001] The utility model relates to the technical field of cooling devices, in particular to a cooling circulation system for producing 4,6-dichloropyrimidine. Background technology:

[0002] 4,6-Dichloropyrimidine is a grayish white needle-shaped crystal with a melting point of 64,66°C. It is difficult to dissolve in water, has a certain solubility in 1,2-dichloroethane, and is easily soluble in solvents such as dichloromethane and DMF. It is mainly used as a pharmaceutical intermediate for the production of sulfonamide-6-methoxypyrimidine. It is used as an intermediate for the synthesis of the fungicide kresoxim-methyl.

[0003] For example, the cooling circulation system for the production of 4,6-dichloropyrimidine with the authorization announcement number "CN218787747U" uses a wiping cotton to wipe the cooling tube back and forth, ensuring the cleanliness of the cooling tube and facilitating the cooling of the coolant. However, the device does not have a device for sealing the coolant. When the coolant is needed to cool the crystallization kettle, the device is required to cool the coolant and then flow the coolant to cool the crystallization kettle. However, the device does not have a device for sealing and cooling the coolant, which reduces the cooling efficiency of the device and reduces the practicality of the device. At the same time, the device does not have a device for quickly replacing the coolant. When the coolant has been used for a long time, the coolant needs to be replaced, but it is inconvenient for the device to replace the coolant. Utility model content:

[0004] The utility model aims to provide a cooling circulation system for producing 4,6-dichloropyrimidine, so as to solve the problems of low practicability and inconvenience in replacing cooling liquid.

[0005] The utility model is implemented by the following technical scheme: a cooling circulation system for the production of 4,6-dichloropyrimidine, comprising a box body and a temporary storage box, an isolation device is arranged inside the box body, the isolation device comprises a fixed box and a first hydraulic cylinder, the fixed box is fixedly connected to the inner surface of the box body, the inner surface of the fixed box is fixedly connected to the first hydraulic cylinder, the telescopic end of the first hydraulic cylinder is fixedly connected to a slider, the slider is slidably engaged with the surface of the slide rod through a through hole opened on the surface, both ends of the slide rod are fixedly connected to the inner surface of the fixed box, the surface of the slider is movably connected to one end of the transmission rod through a rotating shaft, one end of the transmission rod is movably connected to one end of the slide plate through a rotating shaft, one end of the slide plate passes through the surface of the fixed box through a slideway opened on the surface of the fixed box and is fixedly connected to one end of the rubber plate, the protruding part of the surface of the slide plate is fixedly connected to a first spring, and one end of the first spring is fixedly connected to the inner surface of the fixed box.

[0006] A temporary storage box is fixedly connected to the inner surface of the box body, a drainage pipe is fixedly connected to the surface of the temporary storage box, one end of the drainage pipe passes through the surface of the box body, and a valve is fixedly connected to the surface of the drainage pipe.

[0007] The surface of the temporary storage box is provided with a drainage device, and the drainage device includes a second hydraulic cylinder and a trapezoidal block. The second hydraulic cylinder is fixedly connected to the surface of the temporary storage box, and the telescopic end of the second hydraulic cylinder is slidably connected to the surface of the trapezoidal block. The trapezoidal block is fixedly connected to the surface of the pull rod, and the surface of the pull rod is slidably engaged with the through hole opened in the surface of the bent plate. One end of the pull rod passes through the through hole opened on the surface of the bent pipe and is fixedly connected to the surface of the rubber plug. The surface of the bent plate and the surface of the pull rod are respectively fixedly connected to the two ends of the second spring, and the surface of the rubber plug is tightly pressed against the inner surface of the connecting ring. One end of the bent pipe passes through the surface of the temporary storage box and is connected to the inside of the temporary storage box.

[0008] A water tank is fixedly connected to the inner surface of the box body, and the water tank is fixedly connected to one end of a curved pipe through a through hole opened on the surface. A water supply pipe is fixedly connected to the surface of the water tank, and one end of the water supply pipe penetrates the surface of the box body and is clamped with the cover body.

[0009] A refrigeration module is fixedly connected to the inner surface of the box body. The refrigeration module is fixedly connected to two ends of a circulation pipe, and the circulation pipe runs through the water tank.

[0010] A water pump is fixedly connected to the inner surface of the box body, a water outlet pipe of the water pump penetrates the water tank surface and is connected to the inside of the water tank, and a check valve is fixedly connected to the water outlet pipe of the water pump.

[0011] The surface of the box is fixedly connected with an inclined plate, one end of the inclined plate is fixedly connected with the surface of the base, the surface of the base is fixedly connected with a groove box, and the surface of the box is fixedly connected with a control panel.

[0012] A cooling pipe is fixedly connected to the inner surface of the base, one end of the cooling pipe is fixedly connected to one end of a water return pipe, and one end of the water return pipe penetrates the surface of the box and is fixedly connected to the water pumping end of the water pump.

[0013] One end of the cooling pipe is fixedly connected to a straight pipe, the surface of the straight pipe is fixedly connected to the surface of the base, one end of the straight pipe passes through the box body and the water tank surface and is connected to the inside of the water tank, and the straight pipe is slidably connected to the surface of the rubber plate through a groove opened on the surface.

[0014] Advantages of the utility model:

[0015] 1. The utility model cooperates with the isolation device and the water tank. The telescopic end of the first hydraulic cylinder is shortened to drive the slider to move, so that the slider can drive the transmission rod to rotate, so that the transmission rod can pull the slide plate to move upward. At the same time, the slide plate can move upward under the push of the second spring, so that the rubber plate can be separated from the straight pipe, the external power supply of the water pump is connected, and the water inside the return pipe and the cooling pipe is started to be pumped out, and then discharged into the water tank. At the same time, the coolant inside the water tank will be transported to the inside of the cooling pipe through the straight pipe during the discharge. The crystallization kettle is placed on the surface of the groove box, so that the crystallization kettle can be quickly cooled and crystallized. The water inside the water tank is blocked by the rubber plate, so that the water can be circulated at a low temperature, so that the cooling efficiency is higher and the practicality of the device is improved.

[0016] 2. The utility model cooperates with the drainage device and the temporary storage box. The telescopic end of the second hydraulic cylinder is extended to push the trapezoidal block to move, so that the trapezoidal block can drive the pull rod to move synchronously, so that the pull rod can pull the rubber plug to move while stretching the second spring, so that the rubber plug is separated from the surface of the connecting ring, so that the coolant inside the water tank can enter the temporary storage box through the bent pipe. When the discharge is completed, according to the above operation, the telescopic end of the second hydraulic cylinder is returned to its original position, and the rubber plug can be returned to its original position under the push of the second spring. The coolant can be temporarily stored, so that the operator does not need to treat the coolant of the exhaust gas before adding it, which makes it more convenient to replace the coolant in the device. Description of the drawings:

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model;

[0019] Figure 2 A cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model Figure 1 A schematic diagram of a front cross-sectional structure;

[0020] Figure 3 A cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model Figure 1 A schematic diagram of a top view structure;

[0021] Figure 4A cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model Figure 2 A schematic diagram of the front cross-sectional structure of the middle isolation device;

[0022] Figure 5 A cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model Figure 1 A schematic diagram of a partial front view cross-sectional structure of;

[0023] Figure 6 A cooling circulation system for producing 4,6-dichloropyrimidine according to an embodiment of the utility model Figure 1 Schematic diagram of the top view and cross-section structure of the cooling tube and base.

[0024] In the figure: 1, box body, 2, isolation device, 201, fixed box, 202, first hydraulic cylinder, 203, slide bar, 204, slider, 205, transmission rod, 206, first spring, 207, slide plate, 208, rubber plate, 3, water supply pipe, 4, water tank, 5, circulation pipe, 6, refrigeration module, 7, control panel, 8, drainage device, 801, second hydraulic cylinder, 802, trapezoidal block, 803, pull rod, 804, bent plate, 805, second spring, 806, rubber plug, 807, connecting ring, 808, bent pipe, 9, temporary storage box, 10, drainage pipe, 11, cooling pipe, 12, check valve, 13, water pump, 14, inclined plate, 15, return pipe, 16, base, 17, groove box, 18, straight pipe. Specific implementation method:

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Embodiment 1:

[0028] See also Figure 1-6In the present embodiment, a cooling circulation system for the production of 4,6-dichloropyrimidine includes a box body 1 and a temporary storage box 9. An isolation device 2 is provided inside the box body 1. The isolation device 2 includes a fixed box 201 and a first hydraulic cylinder 202. The fixed box 201 is fixedly connected to the inner surface of the box body 1. The inner surface of the fixed box 201 is fixedly connected to the first hydraulic cylinder 202. The first hydraulic cylinder 202 can meet the working needs according to actual needs. The first hydraulic cylinder 202 can drive the slider 204 to move. The first hydraulic cylinder 202 The telescopic end of the slider 204 is fixedly connected to the slider 204, and the slider 204 is slidably engaged with the surface of the slider 203 through the through hole opened on the surface. The slider 203 can fix the position and movement track of the slider 204. Both ends of the slider 203 are fixedly connected to the inner surface of the fixed box 201, so that the position of the slider 203 is fixed, ensuring that the slider 204 can move stably. The surface of the slider 204 is movably connected to one end of the transmission rod 205 through the rotating shaft. The movement of the slider 204 can drive the transmission rod 205 to rotate through the rotating shaft, so that the transmission rod 205 05 can push the slide plate 207 to move, one end of the transmission rod 205 is movably connected to one end of the slide plate 207 through a rotating shaft, and the transmission rod 205 can push the slide plate 207 to move while rotating, so that the slide plate 207 can drive the rubber plate 208 to move synchronously, one end of the slide plate 207 passes through the slideway opened on the surface of the fixed box 201 and is fixedly connected to one end of the rubber plate 208, and the fixed box 201 can fix the position and movement track of the slide plate 207 through the slideway opened on the surface, so that the slide plate 207 can stably push the rubber plate 208 to move, and the protruding part of the surface of the slide plate 207 is fixedly connected to the first spring 206, and the elastic coefficient of the first spring 206 can meet the working needs according to actual needs. The first spring 206 can push the slide plate 207 to move upward, so that the slide plate 207 can make the force direction closer to the movement track under the action of the first spring 206, and one end of the first spring 206 is fixedly connected to the inner surface of the fixed box 201 to fix the position of the first spring 206.

[0029] A temporary storage box 9 is fixedly connected to the inner surface of the box body 1. The capacity of the temporary storage box 9 is the same as that of the water tank 4, so that the water inside the water tank 4 can be discharged into the temporary storage box 9 for storage, so that the operator does not need to collect the waste water and then add water, so that the device can be directly added with water after discharge. A drain pipe 10 is fixedly connected to the surface of the temporary storage box 9, one end of the drain pipe 10 passes through the surface of the box body 1, and a valve is fixedly connected to the surface of the drain pipe 10.

[0030] A drainage device 8 is provided on the surface of the temporary storage box 9, and the drainage device 8 includes a second hydraulic cylinder 801 and a trapezoidal block 802. The second hydraulic cylinder 801 is fixedly connected to the surface of the temporary storage box 9. The second hydraulic cylinder 801 can meet the working needs according to actual needs. The telescopic end of the second hydraulic cylinder 801 is slidably connected to the surface of the trapezoidal block 802. The second hydraulic cylinder 801 can push the trapezoidal block 802 to move, so that the trapezoidal block 802 can drive the pull rod 803 to move. The trapezoidal block 802 is fixedly connected to the surface of the pull rod 803. The surface of the pull rod 803 is slidably connected with the through hole opened on the surface of the bent plate 804, fixing the position and movement track of the pull rod 803, so that the pull rod 803 can be pushed by the trapezoidal block 802 on the surface of the bent plate 804. The pull rod 803 slides in the through hole opened on the surface, one end of the pull rod 803 passes through the through hole opened on the surface of the bent pipe 808 and penetrates the surface of the bent pipe 808 and is fixedly connected to the surface of the rubber plug 806. Under the push of the second spring 805, the pull rod 803 can always make the rubber plug 806 press against the surface of the connecting ring 807, so that the water tank 4 can be in a sealed state. The surface of the bent plate 804 and the surface of the pull rod 803 are respectively fixedly connected to the two ends of the second spring 805. The elastic coefficient of the second spring 805 can meet the working needs according to actual needs. The surface of the rubber plug 806 presses against the inner surface of the connecting ring 807, and one end of the bent pipe 808 penetrates the surface of the temporary storage box 9 and is connected to the inside of the temporary storage box 9. The bent pipe 808 can connect the water tank 4 and the temporary storage box 9.

[0031] A water tank 4 is fixedly connected to the inner surface of the box body 1. The water tank 4 is fixedly connected to one end of the bent pipe 808 through a through hole opened on the surface. A water adding pipe 3 is fixedly connected to the surface of the water tank 4. The water adding pipe 3 can facilitate the operator to add water to the inside of the water tank 4. One end of the water adding pipe 3 passes through the surface of the box body 1 and is snap-connected with the cover body. The cover body can prevent debris from entering the inside of the water adding pipe 3 and causing the device to be blocked during water circulation. A refrigeration module 6 is fixedly connected to the inner surface of the box body 1. The refrigeration module 6 can meet the working needs according to actual needs. The refrigeration module 6 can circulate the cold air through the circulation pipe 5. The circulation pipe 5 can transfer the temperature of the cold air to the coolant inside the water tank 4, so that the coolant can be cooled. The refrigeration module 6 is fixedly connected to both ends of the circulation pipe 5, and the circulation pipe 5 passes through the water tank 4.

[0032] A water pump 13 is fixedly connected to the inner surface of the box body 1. The water pump 13 can meet the working needs according to actual needs. The water pump 13 can circulate the coolant inside the water tank 4. The water outlet pipe of the water pump 13 passes through the surface of the water tank 4 and is connected to the inside of the water tank 4. The water outlet pipe of the water pump 13 is fixedly connected to a check valve 12. The check valve 12 can prevent the coolant from flowing back. The check valve 12 has been disclosed in the prior art and will not be described in detail here, thereby affecting the circulation of the coolant inside the device. An inclined plate 14 is fixedly connected to the surface of the box body 1. The inclined plate 14 can support and fix the base 16. One end of the inclined plate 14 is fixedly connected to the surface of the base 16. The inclined plate 14 and the straight pipe 18 form a triangular structure, which makes the base 16 more stable. A groove box 17 is fixedly connected to the surface of the base 16. A control panel 7 is fixedly connected to the surface of the box body 1. The control panel 7 can control the electrical components inside the device to start. The working principle of the control panel 7 has been disclosed in the prior art and will not be described in detail here.

[0033] The inner surface of the base 16 is fixedly connected with a cooling pipe 11, and the cooling pipe 11 can make the inside of the groove box 17 quickly lowered. The crystallization kettle can be placed inside the groove box 17. One end of the cooling pipe 11 is fixedly connected to one end of the return pipe 15. One end of the return pipe 15 penetrates the surface of the box body 1 and is fixedly connected to the water pump 13. The water pump 13 can circulate the coolant inside the water tank 4 through the return pipe 15. One end of the cooling pipe 11 is fixedly connected with a straight pipe 18. The straight pipe 18 can be a pipe with a steel pipe protective sleeve on the outside, so that the straight pipe 18 can fix the base 16. The surface of the straight tube 18 is fixedly connected to the surface of the base 16, one end of the straight tube 18 passes through the box body 1 and the surface of the water tank 4 and is connected to the inside of the water tank 4, the straight tube 18 can transport the coolant inside the water tank 4, the straight tube 18 is slidably connected to the surface of the rubber plate 208 through the groove opened on the surface, the rubber plate 208 can block the straight tube 18, the straight tube 18 can be sealed between the rubber pad and the rubber plate 208, and the parts connected to the pipeline in this device need to be sealed by a sealing ring to prevent water leakage inside the device.

[0034] Working principle:

[0035] When cooling crystallization is performed on a 4,6-dichloropyrimidine production, the distilled liquid of 4,6-dichloropyrimidine is transferred to a crystallization kettle (dichloroethane has been added to the crystallization kettle in advance), and after the 4,6-dichloropyrimidine product is completely dissolved, the crystallization kettle is cooled and crystallized, and an external power supply of the refrigeration module 6 is turned on, and the refrigeration module 6 is started to produce cold air to circulate through the circulation pipe 5, so that the circulation pipe 5 can transfer the low temperature to the coolant inside the water tank 4, so that the coolant inside the water tank 4 can be quickly cooled.

[0036] Cooling crystallization cycle process:

[0037] Connect the external power supply of the first hydraulic cylinder 202, start the telescopic end of the first hydraulic cylinder 202 to shorten and drive the slider 204 to move, so that the slider 204 can drive the transmission rod 205 to rotate, so that the transmission rod 205 can pull the slide plate 207 to move upward, and at the same time, under the push of the first spring 206, the slide plate 207 can move upward, so that the rubber plate 208 can be separated from the straight pipe 18, connect the external power supply of the water pump 13, start the water pump 13 to extract the water inside the return pipe 15 and the cooling pipe 11, and then discharge it into the water tank 4. At the same time, the coolant inside the water tank 4 will be transported to the inside of the cooling pipe 11 through the straight pipe 18 during the discharge, and the crystallization kettle is placed on the surface of the groove box 17, so that the crystallization kettle can be quickly cooled and crystallized.

[0038] Water change process:

[0039] Connect the external power supply of the second hydraulic cylinder 801, start the telescopic end of the second hydraulic cylinder 801 to extend and push the trapezoidal block 802 to move, so that the trapezoidal block 802 can drive the pull rod 803 to move synchronously, so that the pull rod 803 can pull the rubber plug 806 to move while stretching the second spring 805, so that the rubber plug 806 is separated from the surface of the connecting ring 807, so that the coolant inside the water tank 4 can enter the temporary storage box 9 through the bent pipe 808. When the discharge is completed, according to the above operation, the telescopic end of the second hydraulic cylinder 801 is returned to its original position, and the rubber plug 806 can be returned to its original position under the push of the second spring 805.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling circulation system for the production of 4,6-dichloropyrimidine, comprising a box (1) and a temporary storage box (9), characterized in that: An isolation device (2) is provided inside the box body (1), and the isolation device (2) comprises a fixed box (201) and a first hydraulic cylinder (202). The fixed box (201) is fixedly connected to the inner surface of the box body (1), the inner surface of the fixed box (201) is fixedly connected to the first hydraulic cylinder (202), the telescopic end of the first hydraulic cylinder (202) is fixedly connected to a slider (204), the slider (204) is slidably engaged with the surface of a slide rod (203) through a through hole provided on the surface, and both ends of the slide rod (203) are connected to the fixed box (201). The inner surface of the sliding block (204) is fixedly connected, the surface of the sliding block (204) is movably connected to one end of the transmission rod (205) through a rotating shaft, one end of the transmission rod (205) is movably connected to one end of the sliding block (207) through a rotating shaft, one end of the sliding block (207) passes through a slideway provided on the surface of the fixed box (201) and is fixedly connected to one end of the rubber plate (208), a protruding portion of the surface of the sliding block (207) is fixedly connected to a first spring (206), and one end of the first spring (206) is fixedly connected to the inner surface of the fixed box (201).

2. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 1, characterized in that: The inner surface of the box body (1) is fixedly connected to a temporary storage box (9), the surface of the temporary storage box (9) is fixedly connected to a drainage pipe (10), one end of the drainage pipe (10) passes through the surface of the box body (1), and the surface of the drainage pipe (10) is fixedly connected to a valve.

3. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 2, characterized in that: The surface of the temporary storage box (9) is provided with a drainage device (8), and the drainage device (8) comprises a second hydraulic cylinder (801) and a trapezoidal block (802), the second hydraulic cylinder (801) is fixedly connected to the surface of the temporary storage box (9), the telescopic end of the second hydraulic cylinder (801) is slidably connected to the surface of the trapezoidal block (802), the trapezoidal block (802) is fixedly connected to the surface of the pull rod (803), and the surface of the pull rod (803) and the through hole opened on the surface of the bent plate (804) Slidingly snap-fitted, one end of the pull rod (803) passes through the through hole opened on the surface of the bent tube (808) and penetrates the surface of the bent tube (808) to be fixedly connected to the surface of the rubber plug (806); the surface of the bent plate (804) and the surface of the pull rod (803) are respectively fixedly connected to the two ends of the second spring (805); the surface of the rubber plug (806) is tightly pressed against the inner surface of the connecting ring (807); one end of the bent tube (808) passes through the surface of the temporary storage box (9) and is connected to the inside of the temporary storage box (9).

4. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 1, characterized in that: The inner surface of the box body (1) is fixedly connected to a water tank (4), and the water tank (4) is fixedly connected to one end of the bent pipe (808) via a through hole opened on the surface. The surface of the water tank (4) is fixedly connected to a water supply pipe (3), and one end of the water supply pipe (3) passes through the surface of the box body (1) and is clamped with the cover body.

5. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 1, characterized in that: A refrigeration module (6) is fixedly connected to the inner surface of the box body (1), and the refrigeration module (6) is fixedly connected to both ends of a circulation pipe (5), and the circulation pipe (5) passes through the water tank (4).

6. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 1, characterized in that: A water pump (13) is fixedly connected to the inner surface of the box body (1); a water outlet pipe of the water pump (13) penetrates the surface of the water tank (4) and is connected to the inside of the water tank (4); and a check valve (12) is fixedly connected to the water outlet pipe of the water pump (13).

7. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 1, characterized in that: The surface of the box body (1) is fixedly connected to an inclined plate (14), one end of the inclined plate (14) is fixedly connected to the surface of a base (16), the surface of the base (16) is fixedly connected to a groove box (17), and the surface of the box body (1) is fixedly connected to a control panel (7).

8. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 7, characterized in that: The inner surface of the base (16) is fixedly connected to a cooling pipe (11), one end of the cooling pipe (11) is fixedly connected to one end of a water return pipe (15), and one end of the water return pipe (15) passes through the surface of the box (1) and is fixedly connected to the water pumping end of the water pump (13).

9. A cooling circulation system for producing 4,6-dichloropyrimidine according to claim 8, characterized in that: One end of the cooling pipe (11) is fixedly connected to a straight pipe (18); the surface of the straight pipe (18) is fixedly connected to the surface of the base (16); one end of the straight pipe (18) passes through the box body (1) and the surface of the water tank (4) and is connected to the inside of the water tank (4); the straight pipe (18) is slidably connected to the surface of the rubber plate (208) via a groove provided on the surface.

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