A heat transfer oil furnace for polyurethane production

Abstract

The present invention relates to the technical field of heat-conducting oil furnaces, and particularly relates to a heat-conducting oil furnace for polyurethane production, which comprises a furnace body and an oil circuit system. The furnace body includes a combustion chamber and an air inlet passage communicating with the combustion chamber; a heating pipe is arranged in the combustion chamber; the oil circuit system includes an oil supply pipe, an oil return pipe, a cooling tank, a cooling pipe, a circulation pipe, a first circulation pump, a second circulation pump, a first four-way valve, and a second four-way valve; the cooling tank is arranged in the air inlet passage; the oil supply pipe is communicated with the heating pipe through the first four-way valve, and the oil return pipe, the second four-way valve, the first circulation pump, and the heating pipe are sequentially communicated; the cooling tank is respectively communicated with the second four-way valve and the second circulation pump; by arranging the cooling tank in the passage, the heat-conducting oil in the cooling tank can be cooled by the air flow that naturally sucks air from the air inlet passage when combustion occurs in the combustion chamber, meeting the characteristics that the existing equipment occasionally requires a small amount of low-temperature heat-conducting oil, with fast adjustment response and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of heat-conducting oil furnaces, and particularly to a heat-conducting oil furnace for polyurethane production. Background Art

[0002] In the production process of polyurethane resin, heat supply is required through a heat-conducting oil furnace. Currently, existing heat-conducting oil furnaces generally heat the oil inside the furnace body, and after the oil boils, heat is generated to supply heat to the reaction kettle.

[0003] However, in the existing production process of polyurethane resin, it is necessary to mix with other materials to obtain the finished product. After mixing, the finished product in the reaction kettle needs to be poured out before the next preparation. During the gap time between the two preparations, heat supply from the heat-conducting oil furnace is not required, but instead, the reaction kettle needs to be cooled, otherwise it will affect the stability of the quality of the next polyurethane waterproof coating product; however, the existing cooling system is large in volume, or there are various pipelines, resulting in a very complex set of systems; therefore, a heat-conducting oil furnace for polyurethane production that is simpler in structure and can provide both heating and cooling is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a heat-conducting oil furnace for polyurethane production that is simpler in structure and can provide both heating and cooling.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is as follows:

[0006] A heat-conducting oil furnace for polyurethane production, comprising:

[0007] A furnace body, including a combustion chamber and an air inlet passage communicating with the combustion chamber; natural air intake is carried out through the air inlet passage when combustion occurs in the combustion chamber; a heating pipeline is provided in the combustion chamber; the heating pipeline includes a heating inlet and a heating outlet;

[0008] An oil circuit system, including an oil supply pipeline, an oil return pipeline, a cooling tank, a cooling pipeline, a circulation pipeline, a first circulation pump, a second circulation pump, a first four-way valve, and a second four-way valve; the cooling tank is arranged in the air inlet passage, and there is a gap for air to pass between the outer wall of the cooling tank and the inner wall of the air inlet passage; heat dissipation fins are arranged on the outer periphery of the cooling tank; the oil supply pipeline is communicated with the heating outlet through the first four-way valve, and the oil return pipeline, the second four-way valve, the first circulation pump, and the heating inlet are sequentially communicated; the first four-way valve and the second four-way valve are communicated through the circulation pipeline; the cooling tank includes a cooling inlet and a cooling outlet, the cooling inlet is communicated with the second four-way valve through the cooling pipeline, and the cooling outlet is communicated with the first four-way valve through the second circulation pump; the oil circuit system contains heat-conducting oil;

[0009] The controller controls the operation of the furnace body and the oil circuit system. Combustion occurs in the combustion chamber to obtain high-temperature heat-conducting oil at the heating outlet, and natural air intake in the air inlet passage cools the heat-conducting oil in the cooling tank to obtain low-temperature heat-conducting oil. When the controller receives a temperature increase requirement, the first four-way valve connects the oil supply pipeline and the heating outlet, disconnects the circulation pipeline and the second circulation pump, the second four-way valve connects the oil return pipeline and the first circulation pump, disconnects the circulation pipeline and the cooling pipeline, and simultaneously starts the first circulation pump. When the controller receives a temperature decrease requirement, the first four-way valve connects the oil supply pipeline and the second circulation pump, connects the circulation pipeline and the heating outlet, and simultaneously starts the second circulation pump. The second four-way valve connects the oil return pipeline and the cooling pipeline, and connects the circulation pipeline and the first circulation pump.

[0010] Preferably, when the controller receives a mixing requirement, the first circulation pump and the second circulation pump are in operation. The first four-way valve connects the oil supply pipeline, the second circulation pump, and the heating outlet, and the second four-way valve connects the oil return pipeline, the first circulation pump, and the cooling pipeline.

[0011] Preferably, a first temperature sensor is provided on the oil supply pipeline. The first temperature sensor is electrically connected to the controller, and the controller controls the rotation speeds of the first circulation pump and the second circulation pump based on the temperature of the first temperature sensor.

[0012] Preferably, gas fuel is used during combustion in the combustion chamber, and the furnace body further includes a gas supply pipeline;

[0013] The air inlet passage has an air intake side, and a mixing valve is provided on the air intake side. The mixing valve is respectively connected to the gas supply pipeline and the outside; the mixing valve is electrically connected to the controller respectively.

[0014] Preferably, the furnace body further includes an exhaust passage communicating with the combustion chamber, and an exhaust valve is provided on the exhaust passage. The exhaust valve is electrically connected to the controller.

[0015] Preferably, when the controller receives a shutdown requirement, the mixing valve cuts off the gas supply pipeline and remains connected to the outside. At the same time, the exhaust valve is closed. The first circulation pump and the second circulation pump are in operation. The first four-way valve connects the circulation pipeline, the second circulation pump, and the heating outlet, and the second four-way valve connects the circulation pipeline, the first circulation pump, and the cooling pipeline to form a shutdown circulation; after the shutdown circulation is completed, the mixing valve is closed.

[0016] Preferably, the mixing valve has an air inlet, and an air filter is provided on the air inlet.

[0017] Preferably, a second temperature sensor is provided in the combustion chamber. The second temperature sensor is electrically connected to the controller, and the controller controls the intake air volume of the gas supply pipeline entering the mixing valve according to the temperature obtained by the second temperature sensor.

[0018] Preferably, the surfaces of the oil supply pipeline, the oil return pipeline, the cooling pipeline, and the circulation pipeline are coated with a heat insulation layer.

[0019] Preferably, the air inlet passage is a transparent passage.

[0020] The beneficial effects of the present invention are as follows: By transforming the existing combustion chamber to add an air inlet passage and arranging a cooling tank in the passage, the heat-conducting oil in the cooling tank can be cooled by the air flow that naturally sucks air from the air inlet passage when the combustion chamber burns, meeting the characteristics that the existing equipment occasionally requires a small amount of low-temperature heat-conducting oil. Furthermore, there is no need for additional cooling equipment and power sources for forced cooling, enabling the temperature of the heat-conducting oil in the cooling tank to be reduced below room temperature, making the subsequent various cooling requirements or rapid temperature adjustment respond quickly while having a low cost; and this application does not require major modification of the overall oil guiding pipeline, and only needs to add a set of bypass including a cooling pipeline, a cooling tank, and a second circulation pump to achieve rapid high and low temperature adjustment; when heating a heat-using device such as a reaction kettle starts, by using the continuous natural air intake during the combustion of the furnace body, the cooling tank can be cooled during the natural air intake process. When the reaction kettle needs cooling after the heat use is completed, the low-temperature heat-conducting oil in the cooling tank can be pumped in for cooling and then enter the next cycle, enabling each cooling cycle node to perfectly cooperate with the cooling cycle of the reaction kettle, improving efficiency; and when the low-temperature heat-conducting oil enters, the combustion chamber does not stop operating, and it is quickly circulated and heated through the circulation pipeline, and then rapid temperature rise can be achieved when the subsequent reaction kettle uses heat, further improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a heat-conducting oil furnace for polyurethane production according to a specific embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the heat-conducting oil flow when the controller of a heat-conducting oil furnace for polyurethane production according to a specific embodiment of the present invention receives a temperature increase requirement;

[0023] Figure 3 is a schematic diagram of the heat-conducting oil flow when the controller of a heat-conducting oil furnace for polyurethane production according to a specific embodiment of the present invention receives a temperature decrease requirement (in this figure, solid arrows and hollow arrows are particularly distinguished. The solid arrows in other figures represent the flow direction of the heat-conducting oil; the solid arrows in this figure represent the flow direction of the low-temperature heat-conducting oil, and the hollow arrows represent the flow direction of the high-temperature heat-conducting oil at this time);

[0024] Figure 4 is a schematic diagram of the heat-conducting oil flow when the controller of a heat-conducting oil furnace for polyurethane production according to a specific embodiment of the present invention receives a mixing requirement;

[0025] Figure 5 Schematic diagram of the flow of heat transfer oil when the controller of the heat transfer oil furnace for polyurethane production in the specific embodiment of the present invention receives a shutdown requirement;

[0026] Label description: 1. Furnace body; 11. Combustion chamber; 12. Air inlet channel; 13. Heating pipe; 14. Heating inlet; 15. Heating outlet; 16. Gas supply pipe; 17. Mixing valve; 18. Exhaust valve; 19. Air filter; 2. Oil circuit system; 21. Oil supply pipe; 22. Oil return pipe; 23. Cooling tank; 24. Cooling pipe; 25. Circulation pipe; 26. First circulation pump; 27. Second circulation pump; 28. First four-way valve; 29. Second four-way valve. Specific embodiment

[0027] To describe in detail the technical content, achieved objectives and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0028] Please refer to Figures 1 to 5 , a heat transfer oil furnace for polyurethane production, comprising:

[0029] The furnace body 1 includes a combustion chamber 11 and an air inlet channel 12 communicating with the combustion chamber 11; natural air intake is carried out through the air inlet channel 12 during combustion in the combustion chamber 11; a heating pipe 13 is provided in the combustion chamber 11; the heating pipe 13 includes a heating inlet 14 and a heating outlet 15;

[0030] The oil circuit system 2 includes an oil supply pipe 21, an oil return pipe 22, a cooling tank 23, a cooling pipe 24, a circulation pipe 25, a first circulation pump 26, a second circulation pump 27, a first four-way valve 28, and a second four-way valve 29; the cooling tank 23 is arranged in the air inlet channel 12 and there is a gap for air to pass between the outer wall of the cooling tank 23 and the inner wall of the air inlet channel 12, and heat dissipation fins are arranged on the outer periphery of the cooling tank 23; the oil supply pipe 21 is communicated with the heating outlet 15 through the first four-way valve 28, and the oil return pipe 22, the second four-way valve 29, the first circulation pump 26, and the heating inlet 14 are communicated in sequence; the first four-way valve 28 and the second four-way valve 29 are communicated through the circulation pipe 25; the cooling tank 23 includes a cooling inlet and a cooling outlet, the cooling inlet is communicated with the second four-way valve 29 through the cooling pipe 24, and the cooling outlet is communicated with the first four-way valve 28 through the second circulation pump 27; the oil circuit system 2 contains heat transfer oil;

[0031] The controller controls the operation of the furnace body 1 and the oil circuit system 2. The combustion chamber 11 burns to obtain high-temperature heat-conducting oil at the heating outlet 15, and the air inlet passage 12 sucks air naturally to cool the heat-conducting oil in the cooling tank 23 to obtain low-temperature heat-conducting oil. When the controller receives a temperature increase requirement, the first four-way valve 28 connects the oil supply pipeline 21 and the heating outlet 15, disconnects the circulation pipeline 25 and the second circulation pump 27, the second four-way valve 29 connects the oil return pipeline 22 and the first circulation pump 26, disconnects the circulation pipeline 25 and the cooling pipeline 24, and at the same time starts the first circulation pump 26. When the controller receives a temperature decrease requirement, the first four-way valve 28 connects the oil supply pipeline 21 and the second circulation pump 27, connects the circulation pipeline 25 and the heating outlet 15, and at the same time starts the second circulation pump 27. The second four-way valve 29 connects the oil return pipeline 22 and the cooling pipeline 24, and connects the circulation pipeline 25 and the first circulation pump 26.

[0032] As can be seen from the above description, by transforming the existing combustion chamber 11 to add an air inlet passage 12 and arranging a cooling tank 23 in the passage, the heat-conducting oil in the cooling tank 23 can be cooled by the air flow sucked naturally from the air inlet passage 12 during the combustion of the combustion chamber 11, meeting the characteristics that the existing equipment occasionally needs a small amount of low-temperature heat-conducting oil. Furthermore, there is no need for additional cooling equipment and power sources for forced cooling, enabling the temperature of the heat-conducting oil in the cooling tank 23 to be reduced below room temperature, enabling fast response and low cost for subsequent various temperature decrease requirements or rapid temperature adjustment. And in this application, there is no need to make major modifications to the overall oil conduction pipeline. Only by adding a set of bypass including the cooling pipeline 24, the cooling tank 23, and the second circulation pump 27 can high and low temperature be quickly adjusted. When heating a heat-using device such as a reaction kettle, the cooling tank 23 can be cooled during the continuous natural air suction during the combustion of the furnace body 1. When cooling is needed after the reaction kettle has completed heat use, the low-temperature heat-conducting oil in the cooling tank 23 can be pumped in for cooling and then enter the next cycle, enabling each cooling cycle node to perfectly cooperate with the cooling cycle of the reaction kettle and improving efficiency. While the combustion chamber 11 does not stop operating when the low-temperature heat-conducting oil enters, and it is quickly circulated and heated through the circulation pipeline 25, enabling rapid temperature increase during subsequent heat use of the reaction kettle and further improving efficiency.

[0033] Further, when the controller receives a mixing requirement, the first circulation pump 26 and the second circulation pump 27 are in the working state. The first four-way valve 28 connects the oil supply pipeline 21, the second circulation pump 27, and the heating outlet 15, and the second four-way valve 29 connects the oil return pipeline 22, the first circulation pump 26, and the cooling pipeline 24.

[0034] As can be seen from the above description, when the controller receives a mixing requirement, which is mostly for more precise temperature control, the first four-way valve 28 can be used as the mixing valve 17 at this time to achieve temperature control.

[0035] Further, a first temperature sensor is provided on the fuel supply pipeline 21. The first temperature sensor is electrically connected to the controller, and the controller controls the rotation speeds of the first circulation pump 26 and the second circulation pump 27 according to the temperature of the first temperature sensor.

[0036] As can be seen from the above description, by providing the first temperature sensor, it is convenient for the controller to adjust the rotation speeds of the first circulation pump 26 and the second circulation pump 27 according to negative feedback, thereby realizing the control of the output temperature.

[0037] Further, when the combustion chamber 11 burns, gaseous fuel is used, and the furnace body 1 further includes a gas supply pipeline 16;

[0038] The air inlet passage 12 has an air inlet side, and a mixing valve 17 is provided on the air inlet side. The mixing valve 17 is respectively communicated with the gas supply pipeline 16 and the outside; the mixing valve 17 is electrically connected to the controller respectively.

[0039] As can be seen from the above description, through the mixing valve 17, the passing air flow can also contain gas fuel. Whether the gas fuel is from a municipal gas pipeline or a gas cylinder, the gas is pressurized. Through the expansion and heat absorption of the gas fuel, the temperature of the heat-conducting oil in the cooling tank 23 can be further reduced, further improving flexibility. Moreover, the heat dissipation fins can make the mixing of the gas fuel and air more uniform, improving the combustion effect.

[0040] Further, the furnace body 1 further includes an exhaust passage communicated with the combustion chamber 11. An exhaust valve 18 is provided on the exhaust passage, and the exhaust valve 18 is electrically connected to the controller.

[0041] Further, when the controller receives a shutdown requirement, the mixing valve 17 cuts off the gas supply pipeline 16 and remains communicated with the outside. At the same time, the exhaust valve 18 is closed. The first circulation pump 26 and the second circulation pump 27 are in a working state. The first four-way valve 28 connects the circulation pipeline 25, the second circulation pump 27, and the heating outlet 15. The second four-way valve 29 connects the circulation pipeline 25, the first circulation pump 26, and the cooling pipeline 24 to form a shutdown circulation; after the shutdown circulation is completed, the mixing valve 17 is closed.

[0042] As can be seen from the above description, when a shutdown instruction is received, the low-temperature heat-conducting oil in the cooling tank 23 quickly cools down the combustion chamber 11, avoiding the problem of slow cooling of the oil furnace in the prior art, reducing the shutdown waiting time for cooling, and improving efficiency; at the same time, by closing the mixing valve 17 after the shutdown circulation is completed, it is avoided that the closing of the mixing valve 17 during the cooling of the combustion chamber 11 causes negative pressure, which in turn causes deformation or damage to the combustion chamber 11, and it is also avoided that the flue gas flows back and causes pollution.

[0043] Further, the mixing valve 17 has an air inlet, and an air filter 19 is provided on the air inlet.

[0044] As can be seen from the above description, through the air filter 19, the inhaled air can be filtered to prevent dust and debris from filling the space of the heat dissipation fins and affecting the cooling effect.

[0045] Further, a second temperature sensor is provided in the combustion chamber 11. The second temperature sensor is electrically connected to the controller, and the controller controls the intake air volume of the air supply pipe 16 entering the mixing valve 17 according to the temperature obtained by the second temperature sensor.

[0046] Further, heat insulation layers are coated on the surfaces of the fuel supply pipe 21, the oil return pipe 22, the cooling pipe 24, and the circulation pipe 25.

[0047] As can be seen from the above description, through the setting of the heat insulation layer, heat and cold loss can be reduced.

[0048] Further, the air inlet passage 12 is a transparent passage.

[0049] As can be seen from the above description, through the transparent air inlet passage 12, it is convenient for the staff to observe the cooling box 23 and prevent debris from being sucked in and stuck on the heat dissipation fins.

[0050] Embodiment 1

[0051] A heat transfer oil furnace for polyurethane production, comprising:

[0052] A furnace body 1, including a combustion chamber 11 and an air inlet passage 12 communicating with the combustion chamber 11; when combustion occurs in the combustion chamber 11, natural air intake is carried out through the air inlet passage 12; a heating pipe 13 is provided in the combustion chamber 11; the heating pipe 13 includes a heating inlet 14 and a heating outlet 15;

[0053] The oil circuit system 2 includes an oil supply pipeline 21, an oil return pipeline 22, a cooling tank 23, a cooling pipeline 24, a circulation pipeline 25, a first circulation pump 26, a second circulation pump 27, a first four-way valve 28, and a second four-way valve 29; the cooling tank 23 is arranged in the air inlet passage 12, and there is a gap for air to pass between the outer wall of the cooling tank 23 and the inner wall of the air inlet passage 12. Heat dissipation fins are arranged on the outer periphery of the cooling tank 23; the oil supply pipeline 21 is communicated with the heating outlet 15 through the first four-way valve 28, and the oil return pipeline 22, the second four-way valve 29, the first circulation pump 26, and the heating inlet 14 are communicated in sequence; the first four-way valve 28 and the second four-way valve 29 are communicated through the circulation pipeline 25; the cooling tank 23 includes a cooling inlet and a cooling outlet. The cooling inlet is communicated with the second four-way valve 29 through the cooling pipeline 24, and the cooling outlet is communicated with the first four-way valve 28 through the second circulation pump 27; there is heat-conducting oil in the oil circuit system 2.

[0054] The controller controls the operation of the furnace body 1 and the oil circuit system 2. The combustion chamber 11 burns to make the heating outlet 15 obtain high-temperature heat-conducting oil, and the air inlet passage 12 naturally aspirates to cool the heat-conducting oil in the cooling tank 23 to obtain low-temperature heat-conducting oil; when the controller receives a temperature increase requirement, the first four-way valve 28 connects the oil supply pipeline 21 and the heating outlet 15, disconnects the circulation pipeline 25 and the second circulation pump 27, the second four-way valve 29 connects the oil return pipeline 22 and the first circulation pump 26, disconnects the circulation pipeline 25 and the cooling pipeline 24, and starts the first circulation pump 26 at the same time; when the controller receives a temperature decrease requirement, the first four-way valve 28 connects the oil supply pipeline 21 and the second circulation pump 27, connects the circulation pipeline 25 and the heating outlet 15, starts the second circulation pump 27 at the same time, and the second four-way valve 29 connects the oil return pipeline 22 and the cooling pipeline 24, connects the circulation pipeline 25 and the first circulation pump 26.

[0055] When the controller receives a mixing requirement, the first circulation pump 26 and the second circulation pump 27 are in a working state. The first four-way valve 28 connects the oil supply pipeline 21, the second circulation pump 27, and the heating outlet 15, and the second four-way valve 29 connects the oil return pipeline 22, the first circulation pump 26, and the cooling pipeline 24.

[0056] A first temperature sensor is arranged on the oil supply pipeline 21. The first temperature sensor is electrically connected to the controller, and the controller controls the rotation speeds of the first circulation pump 26 and the second circulation pump 27 according to the first temperature sensor.

[0057] Gas fuel is used when the combustion chamber 11 burns, and the furnace body 1 further includes a gas supply pipeline 16.

[0058] The air inlet passage 12 has an air inlet side, on which a mixing valve 17 is provided. The mixing valve 17 is respectively connected to the gas supply pipeline 16 and the outside; the mixing valve 17 is electrically connected to the controller respectively.

[0059] The furnace body 1 further includes an exhaust passage communicating with the combustion chamber 11. An exhaust valve 18 is provided on the exhaust passage, and the exhaust valve 18 is electrically connected to the controller.

[0060] Embodiment 2

[0061] A heat transfer oil furnace for polyurethane production, the same parts as those in Embodiment 1 will not be described in detail again, and further includes:

[0062] When the controller receives a shutdown requirement, the mixing valve 17 cuts off the gas supply pipeline 16 and remains connected to the outside. At the same time, the exhaust valve 18 is closed. The first circulation pump 26 and the second circulation pump 27 are in a working state. The first four-way valve 28 connects the circulation pipeline 25, the second circulation pump 27, and the heating outlet 15. The second four-way valve 29 connects the circulation pipeline 25, the first circulation pump 26, and the cooling pipeline 24 to form a shutdown circulation; after the shutdown circulation is completed, the mixing valve 17 is closed.

[0063] The mixing valve 17 has an air inlet, and an air filter 19 is provided on the air inlet.

[0064] Embodiment 3

[0065] A heat transfer oil furnace for polyurethane production, the same parts as those in Embodiment 2 will not be described in detail again, and further includes:

[0066] A second temperature sensor is provided in the combustion chamber 11. The second temperature sensor is electrically connected to the controller, and the controller controls the intake air volume of the gas supply pipeline 16 entering the mixing valve 17 according to the temperature obtained by the second temperature sensor.

[0067] The fuel supply pipeline 21, the oil return pipeline 22, the cooling pipeline 24, and the circulation pipeline 25 are coated with a heat insulation layer on the surface.

[0068] The air inlet passage 12 is a transparent passage.

[0069] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A heat-conducting oil furnace for polyurethane production, characterized in that, Comprising: A furnace body, including a combustion chamber and an air inlet passage communicating with the combustion chamber; when combustion occurs in the combustion chamber, natural air intake is carried out through the air inlet passage; a heating pipe is provided in the combustion chamber; the heating pipe includes a heating inlet and a heating outlet. An oil circuit system, including an oil supply pipe, an oil return pipe, a cooling tank, a cooling pipe, a circulation pipe, a first circulation pump, a second circulation pump, a first four-way valve, and a second four-way valve; the cooling tank is arranged in the air inlet passage, and heat dissipation fins are arranged on the outer periphery of the cooling tank; the oil supply pipe is communicated with the heating outlet through the first four-way valve, and the oil return pipe, the second four-way valve, the first circulation pump, and the heating inlet are sequentially communicated; the first four-way valve and the second four-way valve are communicated through the circulation pipe; the cooling tank includes a cooling inlet and a cooling outlet, the cooling inlet is communicated with the second four-way valve through the cooling pipe, and the cooling outlet is communicated with the first four-way valve through the second circulation pump; a heat-conducting oil is provided in the oil circuit system. A controller, controlling the operation of the furnace body and the oil circuit system, the combustion chamber burns, and natural air intake in the air inlet passage cools the heat-conducting oil in the cooling tank to obtain low-temperature heat-conducting oil; when the controller receives a temperature increase requirement, the first four-way valve connects the oil supply pipe and the heating outlet, disconnects the circulation pipe and the second circulation pump, the second four-way valve connects the oil return pipe and the first circulation pump, disconnects the circulation pipe and the cooling pipe, and simultaneously starts the first circulation pump; when the controller receives a temperature decrease requirement, the first four-way valve connects the oil supply pipe and the second circulation pump, connects the circulation pipe and the heating outlet, and simultaneously starts the second circulation pump, and the second four-way valve connects the oil return pipe and the cooling pipe, and connects the circulation pipe and the first circulation pump.

2. The heat transfer oil furnace for polyurethane production according to claim 1, wherein When the controller receives a mixing requirement, the first circulation pump and the second circulation pump are in a working state, the first four-way valve connects the oil supply pipe, the second circulation pump, and the heating outlet, and the second four-way valve connects the oil return pipe, the first circulation pump, and the cooling pipe.

3. The heat transfer oil furnace for polyurethane production according to claim 2, wherein, A first temperature sensor is arranged on the oil supply pipe, the first temperature sensor is electrically connected to the controller, and the controller controls the rotation speeds of the first circulation pump and the second circulation pump according to the first temperature sensor.

4. The heat-conducting oil furnace for polyurethane production according to claim 1, wherein, Gas fuel is used when the combustion chamber burns, and the furnace body further includes a gas supply pipe. The air inlet passage has an air inlet side, and a mixing valve is arranged on the air inlet side, and the mixing valve is respectively communicated with the gas supply pipe and the outside; the mixing valve is electrically connected to the controller.

5. The heat transfer oil furnace for polyurethane production according to claim 4, wherein The furnace body further includes an exhaust passage communicating with the combustion chamber, and an exhaust valve is arranged on the exhaust passage, and the exhaust valve is electrically connected to the controller.

6. The heat transfer oil furnace for polyurethane production according to claim 5, characterized in that, When the controller receives a shutdown requirement, the mixing valve cuts off the gas supply pipe and remains communicated with the outside, and at the same time closes the exhaust valve, the first circulation pump and the second circulation pump are in a working state, the first four-way valve connects the circulation pipe, the second circulation pump, and the heating outlet, and the second four-way valve connects the circulation pipe, the first circulation pump, and the cooling pipe to form a shutdown circulation; after the shutdown circulation is completed, the mixing valve is closed.

7. The heat transfer oil furnace for polyurethane production according to claim 4, characterized in that, The mixing valve has an air inlet, and an air filter is arranged on the air inlet.

8. The heat-conducting oil furnace for polyurethane production according to claim 4, wherein, A second temperature sensor is arranged in the combustion chamber. The second temperature sensor is electrically connected to a controller, and the controller controls the intake air volume of the air supply pipeline entering the mixing valve according to the temperature obtained by the second temperature sensor.

9. The heat transfer oil furnace for polyurethane production according to claim 1, wherein Heat insulation layers are coated on the surfaces of the fuel supply pipeline, the oil return pipeline, the cooling pipeline, and the circulation pipeline.

10. The heat transfer oil furnace for polyurethane production according to claim 1, characterized in that, The air inlet channel is a transparent channel.

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