Thermosyphon pump suitable for double-end mechanical seal of butadiene centrifugal pump

Abstract

The invention relates to the technical field of thermosyphon pumps, in particular to a thermosyphon pump suitable for double-end mechanical sealing of a butadiene centrifugal pump, which comprises a pump body, an input pipe is fixedly arranged on one side of the pump body, an output pipe is fixedly arranged at the other end of the pump body, and an isolation cover is fixedly connected to the outer wall of the output pipe. The spiral preheating pipe is arranged on the outer side of the output pipe of the thermosyphon pump, the high-temperature fluid is used for preheating the low-temperature fluid, the high-temperature fluid is used for preheating the low-temperature fluid, the high-temperature fluid is used for preheating the low-temperature fluid, and the low-temperature fluid is used for preheating the low-temperature fluid. Waste heat can be effectively recycled, energy efficiency is improved, energy loss is reduced, the heat treatment process of the system is optimized, the heating efficiency of the thermosyphon pump can be improved, the service life of equipment is prolonged, energy conservation and emission reduction can be facilitated, and finally more efficient and more environment-friendly system operation is achieved. The pump is safer, more efficient and more stable in the conveying process of fluid which is high in temperature, easy to polymerize and easy to leak.

Description

Technical Field

[0001] This invention relates to the field of thermosiphon pump technology, and more particularly to a thermosiphon pump suitable for a double-ended mechanical seal of a butadiene centrifugal pump. Background Technology

[0002] Butadiene is a Class A flammable and explosive liquid with a low flash point and a tendency to self-polymerize, causing swelling of sealing materials. Single-end mechanical seals rely solely on a pair of friction pairs for sealing. Under high pressure and high speed conditions, frictional heat can easily lead to vaporization of the medium or self-polymerization clogging of the sealing surface, causing leakage risks. Butadiene pumps are being upgraded from single-end to double-end mechanical seals. Conventional double-end mechanical seals rely on forced circulation for coolant circulation, dependent on external power. Double-end mechanical seals utilize both thermosiphon cooling and the mechanical seal's built-in pumping ring, forming a complementary structure of "natural circulation + local assistance," particularly suitable for scenarios with high cooling reliability requirements or large operating condition fluctuations (such as butadiene centrifugal pumps). The application of a siphon cooling system is a core technical measure to ensure the safe operation of the equipment. Through the redundant design of the double-end seal and the efficient cooling of the siphon principle, sealing reliability can be significantly improved, reducing the risk of leakage.

[0003] A thermosiphon pump is a pump that uses temperature difference and heat energy to naturally drive fluid flow. It is widely used for high-temperature liquid transportation, especially in chemical, petroleum, and heat exchange fields. By utilizing a heat source without requiring external electricity, thermosiphon pumps exhibit significant energy-saving and high-efficiency characteristics under high-temperature conditions, making them suitable for applications requiring the transportation of high-temperature fluids.

[0004] Existing thermosiphon pumps with double-ended mechanical seals for butadiene centrifugal pumps are not suitable for preheating the fluid, resulting in uneven or unstable fluid temperature before entering the pump. If the fluid temperature does not reach the ideal state, the siphon effect of the thermosiphon pump may be insufficient, leading to unstable pump flow or even failure to work properly, increasing the burden on the equipment and affecting the overall system's operating efficiency and safety.

[0005] In summary, the existing technology lacks a technique for preheating fluids in thermosiphon pumps. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a thermosiphon pump suitable for double-end mechanical seals of butadiene centrifugal pumps.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a thermosiphon pump suitable for a double-end mechanical seal of a butadiene centrifugal pump, comprising a pump body, an input pipe fixedly installed on one side of the pump body, an output pipe fixedly installed on the other end of the pump body, an isolation cover fixedly connected to the outer wall of the output pipe, a preheating guide seat fixedly connected inside the isolation cover, a sealing seat rotatably connected inside the preheating guide seat, two ball valves fixedly connected to one side of the preheating guide seat, a self-cleaning mechanism provided on one side of the ball valves, and a switching seat fixedly installed on one side of the self-cleaning mechanism.

[0008] Preferably, a cover is rotatably connected to the opening on one side of the isolation cover.

[0009] Preferably, a liquid inlet pipe is fixedly connected to one side of the preheating guide seat, and the other end of the liquid inlet pipe is fixedly connected to the inner wall of the input pipe through the inner wall of the isolation cover. The end of the liquid inlet pipe inside the input pipe has a conical structure. A liquid drain pipe is fixedly connected to the preheating guide seat at a position symmetrical to the liquid inlet pipe. The other end of the liquid drain pipe is fixedly connected to the inner wall of the input pipe through the inner wall of the isolation cover. The end of the liquid drain pipe inside the input pipe has an L-shaped structure with the opening facing downwards.

[0010] Preferably, on the other side of the preheating guide seat, two guide pipes are symmetrically connected and fixedly connected. A connecting hose is fixedly connected to the other end of each guide pipe. A spiral preheating pipe is fixedly connected between the other ends of the two connecting hoses. The spiral preheating pipe is slidably fitted with the outer wall of the output pipe. A transmission frame is fixedly connected to the spiral preheating pipe.

[0011] Preferably, the sealing seat has two symmetrically arranged guide holes. One end of the sealing seat extends through the preheating guide seat and the inner wall of the isolation cover to the outside and is fixedly connected to a motor A. The motor A is fixedly connected to the outer wall of the isolation cover. The other end of the sealing seat extends through the inner wall of the preheating guide seat to the outside and is fixedly connected to a sector gear.

[0012] Preferably, one end of each of the two ball valves is fixedly connected to the inner wall of the two guide pipes, and a worm gear shaft is fixedly connected between the valve stems of the two ball valves. A worm is meshed and driven on one side of the worm gear shaft. A universal joint A is fixedly connected to one end of the worm, and the universal joint A is fixedly connected to the preheating guide seat. A transmission wheel is fixedly connected to the other end of the universal joint A, and the transmission wheel is movably meshed and driven by a sector gear. A discharge pipe connector is fixedly connected to the other end of the lower ball valve, and the other end of the discharge pipe connector is fixedly connected to the inner wall of the isolation cover.

[0013] Preferably, the self-cleaning mechanism includes a suction seat, a motor B is provided on one side of the suction seat, the motor B is fixedly connected to the inner wall of the isolation cover, the output end of the motor B extends through the outer wall of the suction seat to the inside and is fixedly connected to an impeller, and the output end of the suction seat is fixedly connected to one end of the ball valve located on the upper side.

[0014] Preferably, one end of the impeller extends through the inner wall of the suction seat to the outside and is fixedly connected to a universal joint B. The universal joint B is fixedly connected to the outer wall of the suction seat, and the other end of the universal joint B is fixedly connected to an L-shaped transmission rod. The other end of the L-shaped transmission rod is slidably engaged with the inner wall of the transmission frame.

[0015] Preferably, a medium tube is fixedly connected to one side of the switching seat, and the other end of the medium tube is fixedly connected to the input end of the suction seat. A liquid guide tube and a gas guide tube are fixedly connected to the other side of the switching seat in a symmetrical structure. The other ends of the liquid guide tube and the gas guide tube are fixedly connected to the inner wall of the isolation cover. A sealing block is slidably fitted inside the switching seat. An electric push rod is fixedly connected to one end of the sealing block. The other end of the electric push rod is fixedly connected to the inner wall of the switching seat. A filter tube is threadedly connected to the outer end of the gas guide tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By installing a spiral preheating pipe on the outside of the output pipe of the thermosiphon pump, when the thermosiphon pump draws low-temperature fluid into the pump body for heating and siphoning, the high-temperature fluid in the output pipe will preheat the fluid in the spiral preheating pipe. At this time, the preheated fluid in the spiral preheating pipe is reinjected into the pump body through the input pipe. Using high-temperature fluid to preheat low-temperature fluid can effectively recover waste heat, improve energy efficiency, reduce energy loss, and optimize the heat treatment process of the system. This not only improves the heating efficiency of the thermosiphon pump and extends the equipment life, but also helps to save energy and reduce emissions, ultimately achieving more efficient and environmentally friendly system operation. This makes the pump safer, more efficient, and more stable in the process of transporting high-temperature, easily polymerized, and easily leaking fluids.

[0018] 2. By setting up a self-cleaning mechanism and a switching seat, the high-speed rotating impeller can inject cleaning fluid into the spiral preheating tube for cleaning. At the same time, the switching seat can switch the medium. When the filtered air is injected into the spiral preheating tube, the inner wall of the spiral preheating tube can be dried after cleaning. Meanwhile, the rotating impeller can drive the spiral preheating tube to move back and forth through the L-shaped transmission rod, which can efficiently remove the scale inside the spiral preheating tube, ensure that the spiral preheating tube is kept in the best working condition, and ensure the preheating efficiency of the fluid.

[0019] 3. By setting a sealing seat inside the preheating guide seat, the two ends of the spiral preheating tube can be sealed during cleaning of the inner wall of the spiral preheating tube, preventing the cleaning liquid or gas from leaking into the external environment. At the same time, the rotating sealing seat can drive the ball valve to open and close automatically through the sector gear, so that the cleaning medium can enter the spiral preheating tube. This realizes the fully automatic control of the cleaning process, reduces manual intervention, improves cleaning efficiency and accuracy, reduces the occurrence of human error, and makes the system more intelligent and efficient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of the overall structure of a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention.

[0022] Figure 3 This is a partial structural schematic diagram of a thermosiphon pump suitable for a butadiene centrifugal pump with a double-ended mechanical seal, according to the present invention.

[0023] Figure 4 This is a partial cross-sectional schematic diagram of a preheating guide seat structure for a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention.

[0024] Figure 5 This is a schematic diagram of the sealing seat and other structures of a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention;

[0025] Figure 6 This is a schematic diagram of a ball valve structure for a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention.

[0026] Figure 7 This is a partial cross-sectional schematic diagram of the self-cleaning mechanism structure of a thermosiphon pump with a double-ended mechanical seal for a butadiene centrifugal pump according to the present invention.

[0027] Figure 8 This is a partial cross-sectional view of the switching seat structure of a thermosiphon pump with a double-ended mechanical seal suitable for butadiene centrifugal pumps according to the present invention.

[0028] The diagram shows: 1. Pump body; 2. Inlet pipe; 3. Outlet pipe; 4. Isolation cover; 5. Preheating guide seat; 6. Sealing seat; 7. Ball valve; 8. Self-cleaning mechanism; 9. Switching seat; 401. Baffle; 501. Inlet pipe; 502. Drain pipe; 503. Guide pipe; 504. Connecting hose; 505. Spiral preheating pipe; 506. Transmission frame; 601. Guide hole; 602. Motor A; 60 3. Sector gear; 701. Worm gear shaft; 702. Worm; 703. Universal joint A; 704. Drive wheel; 705. Discharge pipe connector; 801. Suction seat; 802. Motor B; 803. Impeller; 804. Universal joint B; 805. L-shaped drive rod; 901. Medium pipe; 902. Liquid guide pipe; 903. Air guide pipe; 904. Sealing block; 905. Electric actuator; 906. Filter tube. Detailed Implementation

[0029] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0030] like Figures 1-8 The thermosiphon pump shown is suitable for a double-end mechanical seal of a butadiene centrifugal pump. It includes a pump body 1, an input pipe 2 fixedly installed on one side of the pump body 1, and an output pipe 3 fixedly installed on the other end of the pump body 1. An isolation cover 4 is fixedly connected to the outer wall of the output pipe 3. A preheating guide seat 5 is fixedly connected inside the isolation cover 4. A sealing seat 6 is rotatably connected inside the preheating guide seat 5. Two ball valves 7 are fixedly connected to one side of the preheating guide seat 5. A self-cleaning mechanism 8 is provided on one side of the ball valves 7. A switching seat 9 is fixedly installed on one side of the self-cleaning mechanism 8.

[0031] like Figure 3 As shown, a baffle 401 is rotatably connected to the opening on one side of the isolation cover 4. The isolation cover 4 and the baffle 401 provide protection and isolation for the input pipe 2 and the spiral preheating pipe 505, preventing dust accumulation from affecting the heat conduction efficiency.

[0032] like Figure 4As shown, a liquid inlet pipe 501 is fixedly connected to one side of the preheating guide seat 5. The other end of the liquid inlet pipe 501 passes through the inner wall of the isolation cover 4 and is fixedly connected to the inner wall of the input pipe 2. The end of the liquid inlet pipe 501 located inside the input pipe 2 is tapered. A drain pipe 502 is fixedly connected to the preheating guide seat 5 at a position symmetrical to the liquid inlet pipe 501. The other end of the drain pipe 502 passes through the inner wall of the isolation cover 4 and is fixedly connected to the inner wall of the input pipe 2. The end of the drain pipe 502 located inside the input pipe 2 is L-shaped with the opening facing downwards. The inlet pipe 501 is tapered at one end inside the input pipe 2, which facilitates fluid flow into the inlet pipe 501. The outlet pipe 502 is L-shaped with its opening facing downwards at one end inside the input pipe 2. This allows the pressure inside the input pipe 2 to decrease as the flow rate increases. When the opening of the outlet pipe 502 is in a low-pressure region, the preheated fluid in the spiral preheating pipe 505 can flow back into the input pipe 2 through the pressure difference.

[0033] On the other side of the preheating guide seat 5, two guide pipes 503 are symmetrically connected and fixedly connected. A connecting hose 504 is fixedly connected to the other end of the guide pipe 503. A spiral preheating pipe 505 is fixedly connected between the other ends of the two connecting hoses 504. The spiral preheating pipe 505 is slidably fitted with the outer wall of the output pipe 3. A transmission frame 506 is fixedly connected to the spiral preheating pipe 505.

[0034] By installing a spiral preheating pipe 505 on the outside of the output pipe 3 of the pump body 1, when the pump body 1 draws low-temperature fluid into the pump body 1 for heating and siphoning, the high-temperature fluid in the output pipe 3 will preheat the fluid in the spiral preheating pipe 505. At this time, the preheated fluid in the spiral preheating pipe 505 is reinjected into the pump body 1 through the input pipe 2. Using high-temperature fluid to preheat low-temperature fluid can effectively recover waste heat, improve energy efficiency, reduce energy loss, and optimize the heat treatment process of the system. This not only improves the heating efficiency of the thermosiphon pump and extends the equipment life, but also helps to save energy and reduce emissions, ultimately achieving more efficient and environmentally friendly system operation. This makes the pump safer, more efficient, and more stable in the process of transporting high-temperature, easily polymerized, and easily leaking fluids.

[0035] like Figure 5 As shown, the sealing seat 6 has two symmetrically arranged guide holes 601. One end of the sealing seat 6 extends through the inner wall of the preheating guide seat 5 and the isolation cover 4 and is fixedly connected to the motor A602. The motor A602 is fixedly connected to the outer wall of the isolation cover 4. The other end of the sealing seat 6 extends through the inner wall of the preheating guide seat 5 and is fixedly connected to the sector gear 603. The sector gear 603 drives the automatic opening and closing of the ball valve 7.

[0036] like Figure 6As shown, one end of each of the two ball valves 7 is fixedly connected to the inner wall of the two guide pipes 503. A worm gear shaft 701 is fixedly connected between the valve stems of the two ball valves 7. A worm 702 is meshed and driven on one side of the worm gear shaft 701. A universal joint A703 is fixedly connected to one end of the worm 702. The universal joint A703 is fixedly connected to the preheating guide seat 5. A transmission wheel 704 is fixedly connected to the other end of the universal joint A703. The transmission wheel 704 is movably meshed and driven by the sector gear 603. The other end of the lower ball valve 7 is fixedly connected to a discharge pipe connector 705. The other end of the discharge pipe connector 705 is fixedly connected to the inner wall of the isolation cover 4. The discharge pipe connector 705 is connected to an external sewage pipe.

[0037] like Figure 7 As shown, the self-cleaning mechanism 8 includes a suction seat 801. A motor B802 is provided on one side of the suction seat 801. The motor B802 is fixedly connected to the inner wall of the isolation cover 4. The output end of the motor B802 extends through the outer wall of the suction seat 801 and is fixedly connected to an impeller 803. The output end of the suction seat 801 is fixedly connected to one end of the ball valve 7 located on the upper side.

[0038] One end of the impeller 803 extends through the inner wall of the suction seat 801 to the outside and is fixedly connected to a universal joint B804. The universal joint B804 is fixedly connected to the outer wall of the suction seat 801. The other end of the universal joint B804 is fixedly connected to an L-shaped transmission rod 805. The other end of the L-shaped transmission rod 805 is slidably engaged with the inner wall of the transmission frame 506.

[0039] like Figure 8 As shown, a medium tube 901 is fixedly connected to one side of the switching seat 9, and the other end of the medium tube 901 is fixedly connected to the input end of the suction seat 801. On the other side of the switching seat 9, a liquid guide tube 902 and an air guide tube 903 are symmetrically connected and fixedly connected. The other ends of both the liquid guide tube 902 and the air guide tube 903 are fixedly connected to the inner wall of the isolation cover 4. A sealing block 904 is slidably fitted inside the switching seat 9. An electric actuator 905 is fixedly connected to one end of the sealing block 904, and the other end of the electric actuator 905 is fixedly connected to the inner wall of the switching seat 9. A filter tube 906 is threadedly connected to the outer end of the air guide tube 903. The filter tube 906 filters the air.

[0040] Working Principle: When used in a thermosiphon pump for a butadiene centrifugal pump with a double-ended mechanical seal, it compensates for the low power limitation of thermosiphon pumps. Thermosiphon pumps rely on density difference for drive. When operating conditions fluctuate, such as a decrease in pump speed or a sudden drop in ambient temperature leading to an increase in coolant viscosity, the circulation power may be insufficient, resulting in a slowdown in the local coolant flow rate within the sealing cavity and a decrease in heat exchange efficiency. The local pumping force of the pumping ring can directly accelerate the liquid flow within the sealing cavity. Even if the overall circulation speed of the thermosiphon system slows down, it can still ensure sufficient coolant flushing around the friction pair, avoiding seal failure caused by local overheating such as a sudden increase in friction surface temperature.

[0041] By reducing the system dependence of the pumping ring, the system addresses the issue. When used alone, the pumping ring's effective range is limited to the sealed cavity, unable to drive the coolant to complete the full cycle of "sealed cavity → heat exchanger → reflux," still requiring an external power pump for conventional forced circulation. When combined with a thermosiphon system, the thermosiphon system can handle the core functions of "full-cycle circulation + overall cooling," while the pumping ring only needs to assist in optimizing the local flow field, eliminating the need for an external power pump. This simplifies the system structure and reduces the risk of power failures such as external pump jamming leading to circulation interruption.

[0042] The thermosiphon pump discharges the heated fluid through the output pipe 3. A portion of the fluid entering the input pipe 2 enters the inlet pipe 501, and then is injected into one of the guide pipes 503 through the guide hole 601 on the sealing seat 6. It is then injected into the spiral preheating pipe 505 through the connecting hose 504. At this time, the residual heat of the high-temperature fluid will preheat the fluid in the spiral preheating pipe 505 through the output pipe 3. Then, the preheated fluid flows back into the input pipe 2 through the drain pipe 502.

[0043] When it is necessary to clean the scale buildup on the inner wall of the spiral preheating pipe 505, the fluid in the inlet pipe 2 and other pipes is first completely discharged by the thermosiphon pump. Then, the connected sealing seat 6 is rotated by the motor A602, so that the guide hole 601 and the guide pipe 503 are misaligned and sealed. At this time, the rotating sealing seat 6 will drive the transmission wheel 704 to rotate through the sector gear 603, so that the transmission wheel 704 drives the worm gear 702 connected to the universal joint A703 to rotate, so that the worm gear 702 can drive the worm wheel shaft 701 to rotate, so that the worm wheel shaft 701 drives the connected valve stem to rotate, so that the two ball valves 7 are open.

[0044] Then, the motor B802 drives the connected impeller 803 to rotate. At this time, the impeller 803 will generate negative pressure, and the external cleaning liquid will be drawn into the switching seat 9 through the liquid guide pipe 902. It will be injected into the guide pipe 503 through the switching seat 9 and the suction seat 801, and then enter the spiral preheating pipe 505 through the connecting hose 504 to rinse its inner wall. At the same time, the rotating impeller 803 will drive the L-shaped transmission rod 805 connected to the universal joint B804 to rotate, so that the L-shaped transmission rod 805 can drive the spiral preheating pipe 505 connected to the transmission frame 506 to reciprocate. Then, the rinsed liquid will be discharged through the discharge pipe joint 705 connected to another ball valve 7.

[0045] After cleaning, the electric actuator 905 drives the sealing block 904 to move, so that the sealing block 904 blocks the opening of the liquid guide tube 902, making the air guide tube 903 open. At this time, under the action of the impeller 803, the external air can be filtered through the filter tube 906 and injected into the spiral preheating tube 505 to dry the moisture in the spiral preheating tube 505.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A thermosyphon pump suitable for use in a double mechanical seal of a centrifugal pump of butadiene, comprising a pump body (1), characterized in that: The pump body (1) one side is provided with an input pipe (2), the other end of the pump body (1) is provided with an output pipe (3), the outer wall of the output pipe (3) is fixedly connected with a isolation cover (4), the inner wall of the isolation cover (4) is fixedly connected with a preheating flow guide base (5), the inner wall of the preheating flow guide base (5) is rotatably connected with a sealing base (6), the preheating flow guide base (5) is fixedly connected with two ball valves (7) on one side, the ball valve (7) is provided with a self-cleaning mechanism (8) on one side, the self-cleaning mechanism (8) is fixedly connected with a switching base (9) on one side.

2. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene, according to claim 1, characterized in that: The isolation cover (4) is rotatably connected with a cover (401) on one side.

3. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene, according to claim 1, characterized in that: The preheating flow guide base (5) is fixedly connected with a liquid inlet pipe (501) on one side, the other end of the liquid inlet pipe (501) is fixedly connected with the inner wall of the input pipe (2) through the inner wall of the isolation cover (4), the end of the liquid inlet pipe (501) in the input pipe (2) is provided in a tapered structure, the preheating flow guide base (5) is fixedly connected with a liquid outlet pipe (502) at the position symmetrical to the liquid inlet pipe (501) on the upper and lower sides, the other end of the liquid outlet pipe (502) is fixedly connected with the inner wall of the input pipe (2) through the inner wall of the isolation cover (4), the end of the liquid outlet pipe (502) in the input pipe (2) is provided in an L-shaped structure with the opening downward.

4. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene according to claim 1, characterized in that: The preheating flow guide base (5) is fixedly connected with two flow guide pipes (503) on the other side in a symmetrical structure, the other end of the flow guide pipe (503) is fixedly connected with a connecting hose (504), the other end of the connecting hose (504) is fixedly connected with a spiral preheating pipe (505), the spiral preheating pipe (505) is slidably connected with the outer wall of the output pipe (3), the spiral preheating pipe (505) is fixedly connected with a transmission frame (506).

5. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene according to claim 4, characterized in that: The sealing base (6) is provided with two flow guide holes (601) in a symmetrical structure, the other end of the sealing base (6) extends to the outside through the inner wall of the preheating flow guide base (5) and the isolation cover (4) and is fixedly connected with a motor A (602), the motor A (602) is fixedly connected with the outer wall of the isolation cover (4), the other end of the sealing base (6) extends to the outside through the inner wall of the preheating flow guide base (5) and is fixedly connected with a fan-shaped gear (603).

6. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene, according to claim 5, characterized in that: Two said ball valves (7) one end is respectively fixedly connected with two inner wall of flow guide pipe (503) through, the valve stem between two said ball valves (7) fixedly connected with worm shaft (701), the worm shaft (701) one side engagement transmission is provided with worm (702), the worm (702) one end fixedly connected with universal joint A (703), the universal joint A (703) and preheating flow guide seat (5) fixedly connected, the universal joint A (703) the other end fixedly connected with transmission wheel (704), the transmission wheel (704) and sector gear (603) movable engagement transmission is arranged, the ball valve (7) other end fixedly connected with discharge pipe joint (705) located in the lower side, the discharge pipe joint (705) other end and the inner wall of isolation cover (4) through fixedly connected with.

7. A thermosyphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene, according to claim 4, characterized in that: The self-cleaning mechanism (8) includes suction seat (801), one side of the suction seat (801) is provided with motor B (802), the motor B (802) and the inner wall of isolation cover (4) are fixedly connected, the output end of motor B (802) extends to the inside through the outer wall of suction seat (801) and is fixedly connected with impeller (803), the output end of suction seat (801) is fixedly connected with one end of the ball valve (7) located in the upper side.

8. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene, according to claim 7, characterized in that: The impeller (803) one end extends to the outside through the inner wall of suction seat (801) and is fixedly connected with universal joint B (804), the universal joint B (804) and the outer wall of suction seat (801) are fixedly connected, the other end of universal joint B (804) is fixedly connected with L-shaped transmission rod (805), the other end of L-shaped transmission rod (805) and the inner wall of transmission frame (506) are slidably connected.

9. A thermosiphon pump suitable for use in a double mechanical seal of a centrifugal pump for butadiene according to claim 8, characterized in that: The switching seat (9) one side is fixedly connected with medium pipe (901) through, the other end of medium pipe (901) and the input end of suction seat (801) are fixedly connected, the other side of switching seat (9) is symmetrically fixedly connected with liquid guide pipe (902) and air guide pipe (903) through, the other end of liquid guide pipe (902) and air guide pipe (903) is fixedly connected with the inner wall of isolation cover (4) through, the switching seat (9) is slidably connected with sealing block (904), one end of sealing block (904) is fixedly connected with electric push rod (905), the other end of electric push rod (905) and the inner wall of switching seat (9) are fixedly connected, the outer end of air guide pipe (903) is threadedly connected with filter pipe (906).

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