TCU system with heat conduction oil automatic recovery function and heat conduction oil recovery method

Abstract

The invention discloses a TCU (transmission control unit) system with an automatic heat conduction oil recovery function, which comprises a temperature rising pipeline, a heat conduction oil recovery pipeline, a heat conduction oil recovery pipeline, a heat conduction oil recovery pipeline and a heat conduction oil recovery pipeline, and is characterized in that the temperature rising pipeline is mounted in a TCU cabinet; the cooling pipeline is installed in the TCU device cabinet and connected with the heating pipeline in parallel, and a second pneumatic control valve and a second heat exchanger are further installed on the cooling pipeline; the heat conduction oil circulation pipeline is installed in the TCU device cabinet, a circulation pump is installed on the heat conduction oil circulation pipeline, and the heat conduction oil circulation pipeline communicates with the first heat exchanger and the second heat exchanger; the expansion tank is mounted at the top of the TCU device cabinet and is communicated with the conduction oil circulating pipeline through a first return pipe; the reaction kettle pipeline is communicated with the heat conduction oil circulating pipeline, an air branch pipe is arranged on the reaction kettle pipeline, a first switch ball valve is mounted on the air branch pipe, a second switch ball valve is mounted on the reaction kettle pipeline, and a third switch ball valve is mounted on the first return pipe. The problem that heat conduction oil in a jacket affects the sterilization effect of the reaction kettle is solved.

Description

TECHNICAL FIELD

[0001] The application relates to a TCU system with automatic heat-conducting oil recovery and a heat-conducting oil recovery method, and belongs to the technical field of pharmaceutical equipment production. BACKGROUND

[0002] In the pharmaceutical process, heating and refrigeration equipment play a key role; the refrigeration and heating all-in-one machine is a device that has appeared in recent years with the improvement of temperature control requirements in the pharmaceutical and chemical industries. It combines the functions of refrigeration and heating and can quickly and accurately control the temperature. This device uses advanced refrigeration and heating technology to make the temperature control in the pharmaceutical and chemical production process more efficient.

[0003] In the pharmaceutical process, sterilizing the reaction kettle is a core link to ensure the quality, safety and compliance of drugs, and its necessity stems from the potential risk of microbial contamination and the strict regulatory requirements of the pharmaceutical industry. High-pressure steam sterilization is commonly used for sterilizing the reaction kettle, which uses 121 DEG C high-temperature high-pressure steam to kill microorganisms. When high-pressure steam sterilization is used for the reaction kettle in the TCU system, if the heat-conducting oil in the jacket is not emptied, it may cause heat transfer efficiency to decrease, local overheating, equipment damage, sterilization failure and safety hazards. Because the heat load of the heat-conducting oil can significantly reduce the sterilization temperature (the actual temperature may be lower than the temperature table display value), it causes the survival of heat-resistant microorganisms such as spores.

[0004] Therefore, the inventor proposes a TCU system with automatic heat-conducting oil recovery to effectively solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a relatively compact structure to solve the problem that when high-pressure steam sterilization is used for the reaction kettle in the TCU system, if the heat-conducting oil in the jacket is not emptied, it may cause heat transfer efficiency to decrease, local overheating, equipment damage, sterilization failure and safety hazards.

[0006] The technical problem to be solved by the present application is solved by the following technical scheme: A TCU system with automatic heat-conducting oil recovery, comprising: A temperature-raising pipeline is installed in the TCU device cabinet, and a first pneumatic regulating valve and a first heat exchanger are installed on the temperature-raising pipeline; A temperature-lowering pipeline is installed in the TCU device cabinet and is connected in parallel with the temperature-raising pipeline, and a second pneumatic regulating valve and a second heat exchanger are installed on the temperature-lowering pipeline; A heat-conducting oil circulation pipeline is installed in the TCU device cabinet, a circulating pump is installed on the heat-conducting oil circulation pipeline, and the heat-conducting oil circulation pipeline is connected with the first heat exchanger and the second heat exchanger respectively; An expansion tank is installed on the top of the TCU device cabinet and is communicated with the heat conducting oil circulation pipeline through a first return pipe, a second return pipe and a supply pipe respectively; A reactor pipeline is communicated with the heat conducting oil circulation pipeline, an air branch pipe is arranged on the reactor pipeline, a first switch ball valve is installed on the air branch pipe, a second switch ball valve is installed on the reactor pipeline, and a third switch ball valve is installed on the first return pipe; When it is necessary to recover the heat conducting oil on the reactor pipeline, the second switch ball valve is closed, the circulating pump is started, and the first switch ball valve and the third switch ball valve are opened, and then compressed air is introduced from the air branch pipe, and the heat conducting oil is pressed into the expansion tank from the first return pipe.

[0007] Preferably, the first pneumatic regulating valve comprises: A valve body, wherein a valve seat is arranged in the valve body, and a valve core is slidably connected to the valve seat; A valve cover connected to the valve body; A bracket connected to the valve cover; A pneumatic actuator connected to the bracket, wherein the pneumatic actuator comprises a body, a diaphragm and a reset spring; A valve rod, wherein one end of the valve rod is connected to the valve core, and the other end of the valve rod is connected to the diaphragm.

[0008] Preferably, a circulating pipeline inlet and a circulating pipeline outlet are arranged on the heat conducting oil circulation pipeline, a first temperature transmitter is installed near the circulating pipeline inlet, a second temperature transmitter and a first pressure transmitter are installed near the circulating pipeline outlet, a gas-liquid separator is further installed between the first temperature transmitter and the circulating pump, the gas-liquid separator is further communicated with the expansion tank through an exhaust pipe, and the gas-liquid separator is used to prevent cavitation and gas blockage of the circulating pump.

[0009] Preferably, a first Y-type filter is installed between the gas-liquid separator and the circulating pump, the first Y-type filter is used to filter impurities in the heat conducting oil, a second Y-type filter is installed on the heating pipeline, and a third Y-type filter is installed on the cooling pipeline.

[0010] Preferably, a flame arrestor breather valve, a safety valve and a magnetic flap liquid level meter are installed on the expansion tank, when the pressure in the tank is too high, the flame arrestor breather valve discharges excess gas, when the pressure in the tank is too low (a vacuum is formed), the flame arrestor breather valve inhales external air to avoid deformation or damage of the tank body, when the pressure in the expansion tank is rapidly increased due to a fault (such as control failure or excessively high temperature) of the TCU system, exceeds the adjustment range of the flame arrestor breather valve, the safety valve is automatically opened to rapidly release the pressure, thereby preventing the tank body from being broken or exploded.

[0011] Preferably, to achieve flexible adjustment of the temperature of the heat conducting oil, the heat conducting oil circulation pipeline is provided with a heating branch and a cooling branch; the heating branch is connected to the first heat exchanger, and a fifth switch ball valve and a first check valve are installed on the heating branch, the first check valve being used to prevent the heat conducting oil from flowing in the reverse direction in the heating branch; the fifth switch ball valve is used to control the on-off of the circulation pump and the heating branch; the cooling branch is connected to the second heat exchanger, and a sixth switch ball valve is installed on the cooling branch, the sixth switch ball valve being used to control the on-off of the circulation pump and the cooling branch.

[0012] Preferably, the heating pipeline is provided with a steam inlet and a condensed water outlet, a first pneumatic regulating valve being installed near the steam inlet; a trap and a high platform ball valve being installed near the condensed water outlet, the trap and the high platform ball valve being arranged in parallel, which allows the condensed water to be continuously discharged while the steam supply is adjusted, avoids the reduction of thermal efficiency or damage to the equipment caused by the accumulation of condensed water, and improves the energy efficiency and reliability of the overall system.

[0013] Preferably, the cooling pipeline is provided with a glycol water solution inlet and a glycol water solution outlet, a third temperature transmitter and a second pressure transmitter being further installed near the glycol inlet; a fourth temperature transmitter and a third pressure transmitter being installed near the steam inlet.

[0014] Preferably, an explosion-proof control cabinet is installed on the TCU device cabinet, and the PLC electric control unit in the explosion-proof control cabinet is electrically connected with the first pneumatic regulating valve, the second pneumatic regulating valve, the first switch ball valve, the second switch ball valve, the third switch ball valve, the fourth switch ball valve, the fifth switch ball valve, the sixth switch ball valve, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, the fourth temperature transmitter, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, and the circulation pump.

[0015] Preferably, a heat conducting oil recovery method of a TCU system with automatic heat conducting oil recovery is as follows: In order to reduce the heat load of the reaction kettle during sterilization, the heat conducting oil in the reaction kettle jacket needs to be emptied, and the staff sends a first instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet, the PLC electric control unit sends a closing command to the circulation pump and the second switch ball valve upon receiving the first instruction signal, and sends an opening command to the first switch ball valve and the third switch ball valve, and then compressed air is introduced from the air branch pipe, and the heat conducting oil on the reaction kettle pipeline enters the expansion tank through the circulation pipeline outlet and the first return pipe under the action of the compressed air; When the reaction kettle needs to be supplemented with heat conducting oil after sterilization, the staff sends a second instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet, and the PLC electric control unit sends an opening command to the circulating pump and the second switch ball valve after receiving the second instruction signal, and at the same time, a closing command is sent to the first switch ball valve. The heat conducting oil in the expansion tank flows from the supply pipe to the heat conducting oil circulating pipe under the action of the circulating pump, and the compressed air in the reaction kettle pipe flows from the exhaust pipe of the gas-liquid separator to the expansion tank under the action of the pressurized heat conducting oil, and then flows out of the expansion tank through the flame arrestor breather valve.

[0016] The beneficial effects of the present application are: 1. By installing a heating pipeline in the TCU device cabinet, a first pneumatic regulating valve and a first heat exchanger are installed on the heating pipeline; a cooling pipeline is installed in the TCU device cabinet in parallel with the heating pipeline, and a second pneumatic regulating valve and a second heat exchanger are also installed on the cooling pipeline; a heat conducting oil circulating pipeline is installed in the TCU device cabinet, and a circulating pump is installed on the heat conducting oil circulating pipeline; the heat conducting oil circulating pipeline is in communication with the first heat exchanger and the second heat exchanger; an expansion tank is installed on the top of the TCU device cabinet and is in communication with the heat conducting oil circulating pipeline through a first return pipe supply pipe; a reaction kettle pipeline is in communication with the heat conducting oil circulating pipeline, and an air branch pipe is provided on the reaction kettle pipeline, a first switch ball valve is installed on the air branch pipe, a second switch ball valve is installed on the reaction kettle pipeline, and a third switch ball valve is installed on the first return pipe; when it is necessary to recover the heat conducting oil in the reaction kettle pipeline, the second switch ball valve and the circulating pump are closed, and the first switch ball valve and the third switch ball valve are opened, and then compressed air is introduced from the air branch pipe, and the heat conducting oil is pressed into the expansion tank from the first return pipe, thereby achieving the purpose of recovering the heat conducting oil, and solving the problem that when the reaction kettle is sterilized, the heat conducting oil in the jacket takes away part of the heat, affecting the sterilization effect of the reaction kettle.

[0017] 2. By installing an expansion tank on the top of the TCU device cabinet and in communication with the heat conducting oil circulating pipeline through a second return pipe; when the temperature of the heat conducting oil in the heat conducting oil circulating pipeline is too high, the heat conducting oil expands and flows to the expansion tank through the second return pipe; when the temperature in the circulating pipeline decreases and the heat conducting oil in the heat conducting oil circulating pipeline is insufficient, the expansion tank supplements the circulating pipeline with heat conducting oil through the supply pipe, thereby achieving the beneficial effect of balancing the heat conducting oil in the temperature control device.

[0018] 3. The application is provided with an explosion-proof control cabinet on the TCU device cabinet, the PLC electric control unit is connected with the first pneumatic regulating valve, the second pneumatic regulating valve, the first switch ball valve, the second switch ball valve, the third switch ball valve, the fourth switch ball valve, the fifth switch ball valve, the sixth switch ball valve, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, the fourth temperature transmitter, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter and the circulating pump through electric signal; the steam comes from the process steam of the customer factory area, is environmental protection and energy saving, can guarantee the working efficiency, guarantees the precision of temperature control, can meet the pharmaceutical production requirements, accords with the development demand of today, makes the application have strong market competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the TCU system connection structure schematic diagram of the application; Figure 2 It is the TCU device cabinet three-dimensional structure schematic diagram of the application; Figure 3 It is the TCU device cabinet internal structure schematic diagram of the application; Figure 4 It is the structure schematic diagram of the cooling pipeline, the heating pipeline and the heat conducting oil circulating pipeline of the application Figure 1 ; Figure 5 It is the structure schematic diagram of the cooling pipeline, the heating pipeline and the heat conducting oil circulating pipeline of the application Figure 2 ; Figure 6 It is the structure schematic diagram of the first pneumatic regulating valve of the application.

[0020] In the figure: 1, TCU device cabinet; 2, heating pipeline; 3, cooling pipeline; 4, heat conducting oil circulation pipeline; 401, heating branch; 402, cooling branch; 5, first pneumatic regulating valve; 501, valve body; 502, valve seat; 503, valve core; 504, valve rod; 505, valve cover; 506, sliding sleeve; 507, bracket; 508, body; 509, diaphragm; 510, reset spring; 511, air pressure cavity; 512, reset cavity; 6, expansion tank; 601, fire-retardant breather valve; 602, safety valve; 603, magnetic flap liquid level meter; 7, reaction kettle pipeline; 8, reaction kettle; 9, air branch pipe; 10, first on-off ball valve; 11, second on-off ball valve; 12, first temperature transmitter; 13, gas-liquid separator; 14, first Y-type filter; 15, first return pipe; 16, third on-off ball valve; 17, exhaust pipe; 18, second return pipe; 19, make-up pipe; 20, first heat exchanger; 21, first check valve; 22, fifth on-off ball valve; 23, sixth on-off ball valve; 24, second heat exchanger; 25, second pneumatic regulating valve; 26, second temperature transmitter; 27, first pressure transmitter; 28, third temperature transmitter; 29, second pressure transmitter; 30, circulating pump; 31, liquid discharge pipe; 32, fourth on-off ball valve; 33, second Y-type filter; 34, third Y-type filter; 35, fourth temperature transmitter; 36, third pressure transmitter; 37, explosion-proof control cabinet; 38, drain valve; 39, high platform ball valve; 40, ethylene glycol aqueous solution inlet; 41, ethylene glycol aqueous solution outlet; 42, steam inlet; 43, condensate water outlet; 44, circulating pipeline inlet; 45, circulating pipeline outlet. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the technical means, creative characteristics, purposes and effects of the present application, the present application will be further described below in combination with specific drawings.

[0022] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and the like, should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the present application, unless specifically defined otherwise and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the embodiments of the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the embodiments of the present application provide examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0026] As shown in Figures 1-6 A TCU system with automatic recovery of heat conducting oil, comprising: a TCU device cabinet 1, a cooling pipeline 3, a heating pipeline 2, a heat conducting oil circulating pipeline 4, an expansion tank 6, and a reaction kettle pipeline 7.

[0027] Specifically, the housing of the TCU device cabinet 1 is provided with heat dissipation holes, and support legs are arranged at the four corners of the bottom of the TCU device cabinet 1, so that the TCU device cabinet 1 is kept at a certain distance from the ground, and the heat generated inside the TCU device cabinet 1 can also be dissipated from the bottom of the TCU device cabinet 1, further increasing the heat dissipation channel of the TCU device cabinet 1. The explosion-proof control cabinet 37 is installed on the TCU device cabinet 1, and the explosion-proof control cabinet 37 is a Siemens PLC touch screen explosion-proof control cabinet 37 with an audible and visual alarm function produced by Dongguan Xiangke Intelligent Control Equipment Co., Ltd. Its specific structure connection and principle will not be repeated here.

[0028] The heating pipeline 2 is installed in the TCU device cabinet 1, and the heating pipeline 2 is provided with a steam inlet 42 and a condensed water outlet 43, which penetrate through the TCU device cabinet 1 and extend outside the TCU device cabinet 1. It should be noted that the steam inlet 42 is connected to the process steam pipe of the customer's factory area during use, so that the process steam generated in the customer's factory area can be utilized, reducing the energy consumption of the enterprise. A first pneumatic regulating valve 5 is installed near the steam inlet 42, which is driven by a pneumatic actuator to open and close the valve, so that the heating pipeline 2 can be completely cut off or the flow can be regulated. A trap 38 and a high platform ball valve 39 are installed near the condensed water outlet 43, which are connected in parallel. Parallel connection allows simultaneous adjustment of steam supply while continuously removing condensed water, avoiding heat efficiency reduction or equipment damage due to condensed water accumulation, and improving the energy efficiency and reliability of the overall system. A first heat exchanger 20 is installed on the heating pipeline 2, which is a prior art, such as a spiral plate heat exchanger produced by Rui Neng Taiyu (Shenyang) Energy Technology Co., Ltd. A fourth temperature transmitter 35 and a third pressure transmitter 36 are also installed near the steam inlet 42. The double monitoring of the fourth temperature transmitter 35 and the third pressure transmitter 36 can enhance system safety. For example, when the steam temperature is abnormal but the pressure is normal, it may indicate that the first heat exchanger 20 is fouled or blocked; otherwise, it may indicate a problem with the steam source. This multi-dimensional data supports rapid troubleshooting.

[0029] The cooling pipeline 3 is installed in the TCU device cabinet 1 and is connected in parallel with the heating pipeline 2, and the cooling pipeline 3 is provided with a glycol water solution inlet 40 and a glycol water solution outlet 41. It should be noted that the glycol water solution inlet 40 and the glycol water solution outlet 41 are connected to the centralized refrigeration circulating system of the factory area during use.

[0030] A third temperature transmitter 28 and a second pressure transmitter 29 are also installed near the entrance of the ethylene glycol, which can independently trigger an alarm or interlock protection. For example, in extreme cases, if the third temperature sensor fails to detect high temperature, the second pressure transmitter can still trigger protection measures by monitoring abnormal pressure (such as pressure rise due to thermal expansion), improving system safety; The second pneumatic control valve 25 and the second heat exchanger 24 are also installed on the cooling pipeline 3, the second pneumatic control valve 25 is driven by a pneumatic actuator to open and close the valve, which can realize the complete cut-off or flow regulation of the cooling pipeline 3, and the second heat exchanger 24 is a prior art, such as the spiral plate heat exchanger produced by Rui Neng Taiyu (Shenyang) Energy Technology Co., Ltd.

[0031] The heat conducting oil circulation pipeline 4 is installed in the TCU device cabinet 1, and a circulating pump 30 is installed on the heat conducting oil circulation pipeline 4. The circulating pump 30 in the present application adopts a high-temperature circulating magnetic pump, such as RGZ-40E produced by Olande. The heat conducting oil circulation pipeline 4 is provided with a circulation pipeline inlet 44 and a circulation pipeline outlet 45. A first temperature transmitter 12 is installed near the circulation pipeline inlet 44, and a second temperature transmitter 26 and a first pressure transmitter 27 are installed near the circulation pipeline outlet 45. A gas-liquid separator 13 is also installed between the first temperature transmitter 12 and the circulating pump 30, which is also communicated with the expansion tank 6 through the exhaust pipe 17. The gas-liquid separator 13 is used to prevent cavitation and gas blockage of the circulating pump 30. When gas (such as air or dissolved gas) is mixed in the heat conducting oil circulation pipeline 4, the gas may be compressed in the high-pressure area and rapidly expand in the low-pressure area (such as the pump inlet), causing a sudden drop in local pressure and causing cavitation. Cavitation can damage the impeller and seal of the circulating pump 30, shortening the service life of the equipment. The gas-liquid separator 13 removes gas to prevent cavitation. The accumulation of gas in the heat conducting oil circulation pipeline 4 will form a gas block, hindering the circulation of fluid and causing system pressure fluctuations or insufficient flow. The gas-liquid separator 13 can ensure continuous flow of fluid and maintain stable operation of the system. In high-temperature or high-pressure working conditions, dissolved gas in the fluid is more likely to separate. The gas-liquid separator 13 can effectively remove these gases to ensure safe operation of the system. Gas in the heat exchanger will form an insulating layer, reducing the heat exchange efficiency. The gas-liquid separator 13 can ensure that there is no gas interference in the fluid, improving the heat transfer performance of the heat exchanger, thereby improving the temperature control efficiency of the TCU system. It should be noted that the gas-liquid separator 13 of the present application is a prior art from Jiangsu Gaojie Energy-saving Equipment Group Co., Ltd., and the specific structure and principle will not be described in detail.

[0032] The heat conducting oil circulation pipeline 4 is provided with a heating branch 401 and a cooling branch 402; the heating branch 401 is communicated with the first heat exchanger 20, and a fifth switch ball valve 22 and a first check valve 21 are installed on the heating branch 401, the first check valve 21 is used to prevent the heat conducting oil from flowing reversely in the heating branch 401, and the first check valve 21 can also prevent the waste heat of one heat exchanger from affecting the cooling effect during the cooling process; the fifth switch ball valve 22 is used to control the on-off of the circulating pump 30 and the heating branch 401; the cooling branch 402 is communicated with the second heat exchanger 24, and a sixth switch ball valve 23 is installed on the cooling branch 402, the sixth switch ball valve 23 is used to control the on-off of the circulating pump 30 and the cooling branch 402. The circulating pipeline is communicated with a liquid discharge pipe 31, and a fourth switch ball valve 32 is installed on the liquid discharge pipe 31.

[0033] The reaction kettle pipeline 7 is communicated with the heat conducting oil circulation pipeline 4 to form a complete circulation pipeline, the reaction kettle pipeline 7 is communicated with a reaction kettle 8, more specifically, the reaction kettle pipeline 7 is communicated with the jacket of the reaction kettle 8, an air branch pipe 9 is arranged on the reaction kettle pipeline 7, the air branch pipe 9 is connected with an air compressor, a first switch ball valve 10 is installed on the air branch pipe 9, a second switch ball valve 11 is installed on the reaction kettle pipeline 7, and a third switch ball valve 16 is installed on the first return pipe 15.

[0034] The expansion tank 6 is installed on the top of the TCU device cabinet 1 and is communicated with the heat conducting oil circulation pipeline 4 through the first return pipe 15, the second return pipe 18 and the supply pipe 19, and a second check valve is installed on the supply pipe 19; the expansion tank 6 is installed with a fire-retardant breather valve 601, a safety valve 602 and a magnetic flap liquid level meter 603, when the pressure in the tank is too high, the fire-retardant breather valve 601 discharges excess gas; when the pressure in the tank is too low (a vacuum is formed), the fire-retardant breather valve 601 inhales external air to avoid deformation or damage of the tank body, when the TCU system fails (such as control failure, temperature is too high) to cause the pressure in the expansion tank 6 to rise sharply, exceeds the adjustment range of the fire-retardant breather valve 601, the safety valve 602 is automatically opened to rapidly release the pressure to prevent the tank body from being broken or exploded.

[0035] As a preferred embodiment, the first pneumatic regulating valve 5 comprises: a valve body 501, which is internally provided with an S streamline medium passage with a smoother surface and lower medium flow resistance, greatly reducing pressure drop loss, and is provided with an inlet and an outlet, and is internally provided with a valve seat 502, and the valve seat 502 is slidably connected with a valve core 503, and the valve core 503 is fixedly connected with a valve rod 504; a valve cover 505, which is fixedly connected with the valve body 501, and is fixedly connected with a sliding sleeve 506, and the valve rod 504 is slidably connected with the sliding sleeve 506 after penetrating through the valve cover 505, and it is to be noted that the valve rod 504 is filled with a sliding sealing gasket between the valve rod 504 and the sliding sleeve 506, and the sliding sealing gasket is fixedly connected with the sliding sleeve 506 through a screw, and the sliding sealing gasket is one of polytetrafluoroethylene or flexible graphite material, so as to ensure higher strength and good sealing performance; a bracket 507, which is a square structure and is fixedly connected with the valve cover 505 through bottom bolts, and is installed with an electric valve positioner, and the electric valve positioner is electrically connected with the explosion-proof control cabinet 37; a pneumatic actuator, and the pneumatic actuator is fixedly connected with the bracket 507, and comprises a body 508, a diaphragm 509 and a reset spring 510 group, the diaphragm 509 is installed inside the body 508, and separates the body 508 into a gas pressure cavity 511 and a reset cavity 512, the reset spring 510 group is installed in the reset cavity 512, one end of the reset spring 510 group is fixedly connected with the diaphragm 509, and the other end is fixedly connected with the bottom of the reset cavity 512, the reset spring 510 group comprises two springs which are symmetrically arranged with the center line of the diaphragm 509 as the symmetry axis, the gas pressure cavity 511 is provided with an interface connected with a gas supply system, and the gas source of the gas supply system is compressed air provided by an air compressor, which is a prior art and will not be described in detail here; one end of the valve rod 504 is fixedly connected with the diaphragm 509 through a locking nut, and the other end is fixedly connected with the valve core 503. The first pneumatic regulating valve 5 converts the electric signal into a gas pressure signal (such as 0.02-0.1 MPa) through the electric valve positioner to control the compressed air entering the gas pressure cavity 511, and drives the valve rod 504 to slide on the sliding sleeve 506 through the diaphragm 509. The second pneumatic regulating valve 25 is similar in structure and principle to the first pneumatic regulating valve 5, and will not be described here.

[0036] Further, a first Y-type filter 14 is installed between the gas-liquid separator 13 and the circulating pump 30, which is used for filtering impurities in the heat conducting oil, a second Y-type filter 33 is installed on the heating pipeline 2, and a third Y-type filter 34 is installed on the cooling pipeline 3.

[0037] The PLC electric control unit in the explosion-proof control cabinet 37 is connected with the first pneumatic regulating valve 5, the second pneumatic regulating valve 25, the first switch ball valve 10, the second switch ball valve 11, the third switch ball valve 16, the fourth switch ball valve, the fifth switch ball valve 22, the sixth switch ball valve 23, the first temperature transmitter 12, the second temperature transmitter 26, the third temperature transmitter 28, the fourth temperature transmitter 35, the first pressure transmitter 27, the second pressure transmitter 29, the third pressure transmitter 36 and the circulating pump 30 through electric signals, and all are common parts in the market, and the specific structure and principle will not be described here. The first switch ball valve 10, the second switch ball valve 11, the third switch ball valve 16, the fourth switch ball valve, the fifth switch ball valve 22 and the sixth switch ball valve 23 are preferably pneumatic switch ball valves, and are all connected with the air compressor air supply pipeline. The pipeline material is stainless steel 304, and other conventional parts such as cooling pipeline, heating pipeline and heat conducting oil circulating pipeline are also installed on the pipeline. The manual ball valve is installed on the pipeline, which is closed only during maintenance and opened during normal operation. Here, it will not be described one by one.

[0038] A heat conducting oil recovery method of a TCU system with automatic heat conducting oil recovery is as follows: In order to reduce the heat load of the reaction kettle 8 during sterilization, the heat conducting oil in the jacket of the reaction kettle 8 needs to be emptied. The staff sends a first instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet 37. The PLC electric control unit sends a closing command to the circulating pump 30 and the second switch ball valve 11, and sends an opening command to the first switch ball valve 10 and the third switch ball valve 16 after receiving the first instruction signal. Then, compressed air is introduced from the air branch pipe 9, and the heat conducting oil on the reaction kettle pipeline 7 enters the expansion tank 6 through the circulating pipeline outlet 45 and the first backflow pipe 15 under the action of the compressed air. When the reaction kettle 8 needs to be supplemented with heat conducting oil after sterilization, the staff sends a second instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet 37. The PLC electric control unit sends an opening command to the circulating pump 30 and the second switch ball valve 11, and sends a closing command to the first switch ball valve 10 after receiving the second instruction signal. The heat conducting oil in the expansion tank 6 enters the heat conducting oil circulating pipeline 4 from the supply pipe 19 under the action of the circulating pump 30, and the compressed air in the reaction kettle pipeline 7 enters the expansion tank 6 from the exhaust pipe 17 of the gas-liquid separator 13 under the action of the pressurized heat conducting oil, and then is discharged to the outside of the expansion tank 6 through the flame arrestor breather valve 601.

[0039] Principle: The heat conducting oil from the circulating pipeline inlet 44 through the gas-liquid separator 13, the first Y filter into the circulating pump 30, into the circulating pump 30 is divided into two ways, one way into the heating branch 401 through the fifth switch ball valve 22, the first heat exchanger 20, the first check valve 21, the other way into the cooling branch 402 through the sixth switch ball valve 23, the second heat exchanger 24, finally the heating branch 401 and the cooling branch 402 converge to the circulating pipeline outlet 45, and then from the circulating pipeline outlet 45 into the reactor pipeline 7, through the reactor pipeline 7 from the circulating pipeline inlet 44 into the heat conducting oil circulating pipeline 4; When the temperature signal detected by the second temperature transmitter 26 is less than the set value, and the temperature signal is transmitted to the PLC electric control unit arranged in the explosion-proof control cabinet 37, the PLC electric control unit receives the signal and sends the first pneumatic regulating valve 5 and the fifth switch ball valve 22 an opening command, and adjusts the opening of the first pneumatic regulating valve 5 according to the temperature signal transmitted by the second temperature transmitter 26 to adjust the steam flow into the first heat exchanger 20, while sending the sixth switch ball valve 23 and the second pneumatic regulating valve 25 a closing command. The steam from the steam inlet 42 enters the first heat exchanger 20 after the first pneumatic regulating valve 5 and exchanges heat with the heat conducting oil in the heating branch 401, and the steam becomes cooling water after heat exchange and is discharged from the condensate outlet 43. The heated heat conducting oil enters the reactor 8 jacket through the reactor pipeline 7 under the action of the circulating pump 30, and the original heat conducting oil in the reactor 8 jacket enters the heat conducting oil circulating pipeline 4 from the circulating pipeline inlet 44 through the reactor pipeline 7. When the temperature signal detected by the second temperature transmitter 26 is greater than the set value, and the temperature signal is transmitted to the PLC electric control unit arranged in the explosion-proof control cabinet 37, the PLC electric control unit receives the signal and sends the second pneumatic regulating valve 25 and the sixth switch ball valve 23 an opening command, and adjusts the opening of the second pneumatic regulating valve 25 according to the temperature signal transmitted by the second temperature transmitter 26 to adjust the flow of ethylene glycol solution into the second heat exchanger 24, while sending the fifth switch ball valve 22 and the first pneumatic regulating valve 5 a closing command. The ethylene glycol solution from the ethylene glycol solution inlet 40 enters the second heat exchanger 24 through the second pneumatic regulating valve 25 and exchanges heat with the heat conducting oil in the cooling branch 402, and the ethylene glycol solution after heat exchange returns to the refrigeration cycle system from the ethylene glycol solution outlet 41, and the cooled heat conducting oil enters the reactor 8 jacket from the circulating pipeline outlet 45 through the reactor pipeline 7 under the action of the circulating pump 30, and the original heat conducting oil in the reactor 8 jacket enters the heat conducting oil circulating pipeline 4 from the circulating pipeline inlet 44 through the reactor pipeline 7.

[0040] The foregoing merely illustrates the principles of the application and various features and advantages of the application. Those skilled in the art should appreciate that the application is not limited to the embodiments described herein but is amenable to various changes and modifications without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A TCU system with automatic recovery of heat transfer oil, characterized in that, The TCU system with automatic heat-conducting oil recovery comprises a heating pipeline, a first pneumatic regulating valve and a first heat exchanger installed on the heating pipeline, a cooling pipeline installed in a TCU device cabinet and connected with the heating pipeline in parallel, a second pneumatic regulating valve and a second heat exchanger installed on the cooling pipeline, a heat-conducting oil circulation pipeline installed in the TCU device cabinet, a circulating pump installed on the heat-conducting oil circulation pipeline, and the heat-conducting oil circulation pipeline being connected with the first heat exchanger and the second heat exchanger respectively, an expansion tank installed on the top of the TCU device cabinet and connected with the heat-conducting oil circulation pipeline through a first backflow pipeline, a second backflow pipeline and a supply pipeline, a reactor pipeline connected with the heat-conducting oil circulation pipeline, an air branch pipeline provided on the reactor pipeline, a first on-off ball valve installed on the air branch pipeline, a second on-off ball valve installed on the reactor pipeline, and a third on-off ball valve installed on the first backflow pipeline. When it is necessary to recover the heat-conducting oil in the reactor pipeline, the second on-off ball valve and the circulating pump are closed, the first on-off ball valve and the third on-off ball valve are opened, and then compressed air is introduced from the air branch pipeline, so that the heat-conducting oil is pressed into the expansion tank from the first backflow pipeline. The first pneumatic regulating valve comprises a valve body, a valve seat provided in the valve body, a valve core slidably connected to the valve seat, a valve cover connected to the valve body, a bracket connected to the valve cover, a pneumatic actuator connected to the bracket and composed of a body, a diaphragm and a reset spring, and a valve rod connected to the valve core at one end and connected to the diaphragm at the other end. A circulating pipeline inlet and a circulating pipeline outlet are provided on the heat-conducting oil circulation pipeline, a first temperature transmitter is installed near the circulating pipeline inlet, a second temperature transmitter and a first pressure transmitter are installed near the circulating pipeline outlet, a gas-liquid separator is installed between the first temperature transmitter and the circulating pump, the gas-liquid separator is connected with the expansion tank through an exhaust pipeline, and the gas-liquid separator is used to prevent cavitation and gas blockage of the circulating pump. A first Y-type filter is installed between the gas-liquid separator and the circulating pump, the first Y-type filter is used to filter impurities in the heat-conducting oil, a second Y-type filter is installed on the heating pipeline, and a third Y-type filter is installed on the cooling pipeline. A flame arrestor breather valve, a safety valve and a magnetic flip liquid level meter are installed on the expansion tank, the flame arrestor breather valve discharges excess gas when the pressure in the tank is too high, the flame arrestor breather valve inhales external air when the pressure in the tank is too low, deformation or damage of the tank body is avoided, the safety valve is automatically opened when the pressure in the expansion tank rapidly rises due to a fault of the TCU system and exceeds the adjustment range of the flame arrestor breather valve, and the safety valve rapidly releases the pressure to prevent the tank body from being broken or exploded.

6. The TCU system with automatic heat-conducting oil recovery according to any one of claims 1 to 5.

2. The TCU system with automatic recovery of heat conducting oil according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ 3. The TCU system with automatic recovery of heat conducting oil according to claim 1, characterized in that: ​ 4. The TCU system with automatic recovery of heat conducting oil according to claim 3, characterized in that: ​ 5. The TCU system with automatic recovery of heat transfer oil according to claim 1, characterized in that: ​ ​ To achieve flexible adjustment of the temperature of the heat conducting oil, the heat conducting oil circulation pipeline is provided with a heating branch and a cooling branch; the heating branch is communicated with the first heat exchanger, and a fifth switch ball valve and a first check valve are installed on the heating branch, the first check valve is used to prevent the heat conducting oil from flowing reversely in the heating branch; the fifth switch ball valve is used to control the on-off of the circulation pump and the heating branch; the cooling branch is communicated with the second heat exchanger, and a sixth switch ball valve is installed on the cooling branch, the sixth switch ball valve is used to control the on-off of the circulation pump and the cooling branch.

7. The TCU system with automatic recovery of the heat transfer oil according to claim 6, characterized in that: The heating pipeline is provided with a steam inlet and a condensed water outlet, a first pneumatic regulating valve is installed near the steam inlet; a trap and a high platform ball valve are installed near the condensed water outlet, the trap and the high platform ball valve are arranged in parallel, and the parallel arrangement allows the condensed water to be continuously discharged while the steam supply is adjusted, thereby avoiding the reduction of thermal efficiency or damage to the equipment caused by the accumulation of condensed water, and improving the energy efficiency and reliability of the overall system.

8. The TCU system with automatic recovery of the heat transfer oil according to claim 7, characterized in that: The cooling pipeline is provided with a glycol water solution inlet and a glycol water solution outlet, a third temperature transmitter and a second pressure transmitter are further installed near the glycol inlet; a fourth temperature transmitter and a third pressure transmitter are installed near the steam inlet.

9. The TCU system with automatic recovery of the heat transfer oil according to claim 8, characterized in that: The TCU device cabinet is provided with an explosion-proof control cabinet, and the PLC electric control unit in the explosion-proof control cabinet is electrically connected with the first pneumatic regulating valve, the second pneumatic regulating valve, the first switch ball valve, the second switch ball valve, the third switch ball valve, the fourth switch ball valve, the fifth switch ball valve, the sixth switch ball valve, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, the fourth temperature transmitter, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter and the circulation pump.

10. The heat conducting oil recovery method of the TCU system with automatic heat conducting oil recovery according to claim 9, characterized in that: In order to reduce the heat load of the reaction kettle during sterilization, it is necessary to empty the heat conducting oil in the reaction kettle jacket, the staff sends a first instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet, the PLC electric control unit sends a closing command to the circulation pump and the second switch ball valve after receiving the first instruction signal, and sends an opening command to the first switch ball valve and the third switch ball valve, then compressed air is introduced from the air branch, and the heat conducting oil in the reaction kettle pipeline enters the expansion tank through the circulation pipeline outlet and the first return pipe under the action of the compressed air; When the reaction kettle pipeline needs to be supplemented with heat conducting oil after sterilization, the staff sends a second instruction signal to the PLC electric control unit through the touch screen on the explosion-proof control cabinet, the PLC electric control unit sends an opening command to the circulation pump and the second switch ball valve after receiving the second instruction signal, and sends a closing command to the first switch ball valve, the heat conducting oil in the expansion tank enters the heat conducting oil circulation pipeline under the action of the circulation pump, and the compressed air in the reaction kettle pipeline enters the expansion tank from the exhaust pipe of the gas-liquid separator under the action of the pressurized heat conducting oil, and then is discharged to the outside of the expansion tank through the flame arrestor breather valve.

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