A heat transfer oil heat exchange system

Abstract

The present invention discloses a heat transfer oil heat exchange system, wherein the heating unit is connected to the expansion tank through a buffer filter tank. When the heat transfer oil in the system is heated and expanded, the heat transfer oil will enter through the expansion pipe and rush upward to lift the gravity plugging piece, and enter the inner heat exchange cavity located in the lower buffer oil area after being filtered by the oil filter plate. The high-temperature heat transfer oil entering the inner heat exchange cavity will not overflow to the outer overflow cavity until it is higher than the heat exchange overflow baffle, and then enter the expansion tank through the oil outlet pipe. The high-temperature heat transfer oil will gradually cool down during the accumulation process in the inner heat exchange cavity, so as to avoid the high-temperature heat transfer oil directly entering the expansion tank and causing the temperature to be too high. When the gas generated in the system passes through the expansion pipe, the gas can also lift the gravity plugging piece and smoothly discharge the gas through the exhaust pipe. In addition, since the output end of the expansion pipe is exposed in the upper filter oil exhaust area, the gravity plugging piece can block the output end of the expansion pipe to play a sealing role.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange systems, and in particular to a heat transfer oil heat exchange system. Background Art

[0002] The electric heating thermal oil circulation system refers to the process of transferring heat from the heat source to the equipment that needs to be heated continuously through external forces such as high-temperature heat pumps, and then returning to the heating system after circulation, thus forming a relatively complete and independent circulation system. During the operation of the system, the heated thermal oil will expand due to the heat, so a high-position expansion tank is generally set in the system to accommodate the thermal expansion of the thermal oil. When the temperature of the thermal oil in the system drops, the volume of the thermal oil in the system decreases or the oil volume is insufficient, the thermal oil in the expansion tank can automatically flow back to the system again.

[0003] At present, some heat transfer oil systems adopt a dual-pump operation mode to improve the reliability of the system and enhance the flow and pressure guarantee. The two pumps can work at the same time or stand by each other, which can provide greater flow and pressure, meet some process requirements with high requirements for heat transfer oil flow and pressure, and ensure that heat can be efficiently and stably transferred to heat-using equipment, but it is easy to have the oil temperature in the high-level expansion tank be too high. The prior art with patent number CN110986361B discloses a heat transfer oil buffer for a heat medium system. By adding a buffer to the system, when the oil temperature inside the heat medium pipeline increases and the volume expands, the high-temperature heat transfer oil overflows from the expansion tube into the first pipeline, enters the buffer, and squeezes the low-temperature heat transfer oil in the buffer through the second pipeline into the high-level tank, which can keep the oil temperature in the high-level tank unchanged at a low temperature. However, during the circulation of heat transfer oil, impurities in the pipeline will be flushed into the heat transfer oil heating furnace along with the heat transfer oil, and heat transfer oil mixed with gas will also cause safety problems. Therefore, while preventing the oil temperature inside the high-level tank from being too high, it is also necessary to solve the problem of heat transfer oil removal and timely exhaust. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems and provide a heat transfer oil heat exchange system that can filter and cool the expanded heat transfer oil and discharge the expanded gas in time to improve the safety of the system.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A heat transfer oil heat exchange system, comprising a heating unit and a heat-using device connected through a circulation pipeline, wherein an expansion tank is connected to the upper position of the heating unit through a buffer filter tank, wherein: the buffer filter tank comprises a tank body, a tank cover is detachably mounted on the upper end of the tank body, an expansion pipe extending to the interior of the tank body is connected to the bottom of the tank body, the input end of the expansion pipe is connected to the heating unit, the tank cover is connected to an exhaust pipe, an oil filter plate is provided inside the tank body and below the output end of the expansion pipe, the oil filter plate divides the interior of the tank body into an upper oil filter exhaust area and a lower buffer oil area, and a heat exchange is provided around the lower buffer oil area and at a position located on the periphery of the expansion pipe. Overflow baffle, the heat exchange overflow baffle divides the lower buffer oil area into an inner heat exchange chamber and an outer overflow chamber, the oil outlet of the oil filter plate corresponds to the input end of the inner heat exchange chamber, the outer overflow chamber is provided with an oil outlet pipe connected to the high-temperature oil input end of the expansion tank, the inner heat exchange chamber is provided with an oil return pipe connected to the heating unit, the inner heat exchange chamber is provided with an oil replenishment pipe connected to the low-temperature oil output end of the expansion tank, a gravity plugging member is provided at a position between the output end of the expansion tube and the input end of the exhaust pipe inside the tank body, the bottom of the gravity plugging member can be movably sealed on the output end of the expansion tube, and the gas or heat transfer oil output by the expansion tube can lift the gravity plugging member upwards and discharge the gas or heat transfer oil.

[0007] As an improvement of the above technical solution, the gravity sealing member includes a gravity ball and an exhaust chamber, the exhaust chamber is installed on the bottom of the tank cover and is connected to the exhaust pipe, a limited opening is opened on the bottom of the exhaust chamber, the gravity ball is movably installed in the exhaust chamber and the lower end can extend to the outside of the limited opening to movably seal on the output end of the expansion tube.

[0008] As an improvement of the above technical solution, a plurality of exhaust holes connected to the exhaust pipe are provided on the top of the exhaust chamber.

[0009] As an improvement of the above technical solution, an annular oil filter net is provided on the oil filter plate, and the heat exchange overflow baffle is arranged around the outer periphery of the expansion tube and is arranged opposite to the outer ring of the annular oil filter net.

[0010] As an improvement of the above technical solution, a limit mounting ring is provided on the inner wall of the tank body and at a position below the output end of the expansion tube, and a plurality of positioning holes are provided on the limit mounting ring. A mounting edge is provided on the outer periphery of the oil filter plate, and a plurality of mounting holes are provided on the mounting edge at positions corresponding to the positioning holes, and fastening bolts that can cooperate with the corresponding positioning holes are movably inserted in the mounting holes.

[0011] As an improvement of the above technical solution, a sealing ring capable of cooperating with the inner wall of the opening of the tank body is provided on the bottom of the tank cover, an upper flange is provided on the outer periphery of the tank cover, and a lower flange is provided on the outer periphery of the opening end of the tank body. A plurality of flange holes are provided at corresponding positions of the upper flange and the lower flange, and fasteners are inserted into the two opposite groups of flange holes on the upper flange and the lower flange.

[0012] As an improvement of the above technical solution, the heating unit includes a dual-circulation pump module and an organic heat carrier furnace, the input end of the dual-circulation pump module is connected to the return oil pipe and the output end of the heat-using equipment, the output end of the dual-circulation pump module is connected to the input end of the organic heat carrier furnace, and the output end of the organic heat carrier furnace is connected to the input end of the heat-using equipment.

[0013] As an improvement of the above technical solution, it also includes a low-level oil storage tank connected between the output end of the organic heat carrier furnace and the input end of the heat-using equipment.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] A heat transfer oil heat exchange system of the present invention, a heating unit is connected to an expansion tank through a buffer filter tank, when the heat transfer oil in the system is heated and expands, the heat transfer oil will enter through the expansion tube and rush upward to lift the gravity sealing piece, and enter the inner heat exchange chamber located in the lower buffer oil area after being filtered by the oil filter plate, the high-temperature heat transfer oil entering the inner heat exchange chamber will not overflow into the outer overflow chamber until it is higher than the heat exchange overflow baffle, and then enter the expansion tank through the oil outlet pipe, the high-temperature heat transfer oil will gradually cool down during the accumulation process in the inner heat exchange chamber, and low-temperature heat transfer oil can also be injected into the inner heat exchange chamber in advance to speed up the cooling speed, so as to avoid the high-temperature heat transfer oil directly entering the expansion tank and causing the temperature to be too high; when the gas generated in the system passes through the expansion tube, the gas can also lift the gravity sealing piece, and the gas is smoothly discharged through the exhaust pipe. In addition, since the output end of the expansion tube is exposed in the upper oil filter exhaust area, the gravity plugging member can seal the output end of the expansion tube and play a sealing role to prevent the heat transfer oil in the tube from making direct contact with the external air during normal operation of the system, thereby preventing the heat transfer oil from oxidizing and increasing the service life of the heat transfer oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 A schematic diagram of the system structure of an embodiment of the present invention;

[0018] Figure 2 The cross-sectional view of the buffer filter tank in the embodiment of the present invention is Figure 1 ;

[0019] Figure 3The cross-sectional view of the buffer filter tank in the embodiment of the present invention is Figure 2 ;

[0020] Figure 4 for Figure 3 A magnified view of part A;

[0021] Figure 5 The cross-sectional view of the buffer filter tank in the embodiment of the present invention is Figure 3 . DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] like Figures 1 to 5As shown, the present invention provides a heat transfer oil heat exchange system, comprising a heating unit 100 and a heat-using device 200 connected by a circulation pipeline, wherein the upper position of the heating unit 100 is connected to an expansion tank 400 through a buffer filter tank 300, wherein: the buffer filter tank 300 comprises a tank body 310, a tank cover 311 is detachably installed on the upper end of the tank body 310, an expansion pipe 312 extending to the inside of the tank body 310 is connected to the bottom of the tank body 310, the input end of the expansion pipe 312 is connected to the heating unit 100, the tank cover 311 is connected to an exhaust pipe 313, an oil filter plate 320 is provided inside the tank body 310 and at a position below the output end of the expansion pipe 312, the oil filter plate 330 divides the inside of the tank body 310 into an upper oil filter exhaust area and a lower buffer oil area, and an oil filter plate 330 is provided in the lower buffer oil area and at a position located on the periphery of the expansion pipe 312 There is a heat exchange overflow baffle 340, the heat exchange overflow baffle 340 divides the lower buffer oil area into an inner heat exchange chamber 314 and an outer overflow chamber 315, the oil outlet of the oil filter plate 320 corresponds to the input end of the inner heat exchange chamber 314, the outer overflow chamber 315 is provided with an oil outlet pipe 316 connected to the high-temperature oil input end of the expansion tank 400, the inner heat exchange chamber 314 is provided with an oil return pipe 317 connected to the heating unit 100, and the inner heat exchange chamber 314 is provided with a heat exchange oil return pipe 317 connected to the heating unit 100. 4 is provided with an oil replenishing pipe 318 connected to the low-temperature oil output end of the expansion tank 400, and a gravity plugging member 330 is provided at a position between the output end of the expansion pipe 312 and the input end of the exhaust pipe 313 inside the tank body 310. The bottom of the gravity plugging member 330 can be movably sealed on the output end of the expansion pipe 312, and the gas or heat transfer oil output by the expansion pipe 312 can push up the gravity plugging member 330 and discharge the gas or heat transfer oil.

[0026] Among them, the oil outlet of the oil filter plate 320 corresponds to the input end of the inner heat exchange chamber 314, that is, the high-temperature heat-conducting oil filtered by the oil filter plate 320 will first flow into the inner heat exchange chamber 314, and will not overflow into the outer overflow chamber 315 until the height of the heat-conducting oil in the inner heat exchange chamber 314 gradually accumulates and exceeds the heat exchange overflow baffle 340. During this process, the high-temperature heat-conducting oil will be cooled to a certain extent, and the cooled heat-conducting oil in the outer overflow chamber 315 will enter the expansion tank 400 through the oil outlet pipe 316; at the same time, the oil outlet pipe 316 is connected to the high-temperature oil input end of the expansion tank 400, and the oil replenishing pipe 318 is connected to the low-temperature oil output end of the expansion tank 400, so as to form a self-circulating pipeline. Of course, this The low-temperature oil at the 0 expansion tank is relative to the high-temperature oil input, that is, the low-temperature heat transfer oil obtained after the high-temperature heat transfer oil input due to expansion is cooled down inside the expansion tank 400 is the low-temperature heat transfer oil. At this time, when the expanded heat transfer oil enters the buffer filter tank 300 from the expansion tube 312, it will cause the internal temperature of the buffer filter tank 300 to rise, and the pressure will increase, so that the internal expanded hot oil will be squeezed into the expansion tank 400 from the oil outlet pipe 316. Due to the pressure difference and the existence of self-circulation driving force, the low-temperature heat transfer oil in the expansion tank 400 will flow back from the oil replenishment pipe 318 to the inside of the internal heat exchange cavity 314, which can realize self-circulation cooling, and at the same time mix with the hot oil input by the expansion tube 312 for rapid cooling. In addition, in another embodiment, a three-way pipe can be provided on the oil replenishment pipe 318, the first end of the three-way pipe is connected to the low-temperature oil output end of the expansion tank 400, and the second end of the three-way pipe is connected to the external low-temperature heat transfer oil input device, and a certain amount of low-temperature heat transfer oil can be added from the outside to the inner heat exchange cavity 314 in advance through the oil replenishment pipe 318. When the high-temperature heat transfer oil expands from the expansion pipe 312 into the inner heat exchange cavity 314, it can be mixed with the pre-added low-temperature heat transfer oil and quickly cooled, and will not affect the system. The expansion tank 400 is a prior art, which is arranged at the highest position of the entire system, and is connected to an overflow tank and a nitrogen sealing device and other protective devices.

[0027] See also Figures 2 to 4In a specific embodiment of the present application, the gravity plugging member 330 includes a gravity ball 331 and an exhaust chamber 332. The exhaust chamber 332 is installed on the bottom of the tank cover 311 and connected to the exhaust pipe 313. A limit opening 333 is provided on the bottom of the exhaust chamber 332. The gravity ball 331 is movably installed in the exhaust chamber 332 and the lower end can extend to the outside of the limit opening 333 to movably plug the output end of the expansion pipe 312. The diameter of the gravity ball 331 should be larger than the limit opening 333 to ensure that the gravity ball 331 is always located inside the exhaust chamber 332 and its bottom can be plugged at the upper end of the pipe opening of the expansion pipe 312. At the same time, the inner diameter of the expansion pipe 312 should be larger than the diameter of the gravity ball 331 to ensure that the gravity ball 33 can be freely pushed upward and enter the expansion pipe 312, and there is a gap between the gravity ball 33 and the pipe wall for gas circulation. There is a certain distance between the bottom of the exhaust chamber 332 and the output end of the expansion tube 312, so that the high-temperature heat transfer oil can be discharged from the expansion tube 312. Furthermore, a plurality of exhaust holes 334 connected to the exhaust tube 313 are provided on the top of the exhaust chamber 332, and exhaust holes 334 can also be provided on the side wall of the expansion tube 312. When the gas enters the expansion tube 312, the gravity ball 331 will be pushed upward by the gas, and the gas can enter the exhaust chamber 332 and be smoothly discharged from the exhaust tube 313 through the exhaust holes 334.

[0028] See also Figure 2 and Figure 3 In a specific embodiment of the present application, an annular oil filter 321 is provided on the oil filter plate 320, and the heat exchange overflow baffle 340 is disposed around the outer periphery of the expansion tube 312 and is disposed opposite to the outer ring of the annular oil filter 321. That is, the annular oil filter 321 is opposite to the inner heat exchange cavity 314, ensuring that the filtered heat transfer oil can directly flow into the inner heat exchange cavity 314, and will not enter the expansion tank 400 until it overflows into the outer overflow cavity 315.

[0029] In another specific embodiment of the present application, Figure 5 As shown, at this time, the annular oil filter 321 is opposite to the outer overflow chamber 315, that is, the filtered heat transfer oil will directly flow into the outer overflow chamber 315. Since the inner heat exchange chamber 314 is arranged around the outer periphery of the expansion tube 312, low-temperature heat transfer oil is added to the inner heat exchange chamber 314 through the oil replenishing pipe 318. The low-temperature heat transfer oil in the inner heat exchange chamber 314 can directly cool down the high-temperature heat transfer oil flowing through the oil replenishing pipe 318.

[0030] To facilitate cleaning and replacement of the oil filter plate 320, a limit mounting ring 350 is provided on the inner wall of the tank body 310 and at a position below the output end of the expansion tube 312. The limit mounting ring 350 is provided with a plurality of positioning holes. A mounting edge 322 is provided on the outer periphery of the oil filter plate 320. A plurality of mounting holes are provided on the mounting edge 322 at positions corresponding to the positioning holes. Fastening bolts 323 capable of cooperating with the corresponding positioning holes are movably inserted in the mounting holes.

[0031] Furthermore, a sealing ring 319 capable of cooperating with the inner wall of the opening of the tank body 310 is provided on the bottom of the tank cover 311, an upper flange is provided on the outer periphery of the tank cover 311, and a lower flange is provided on the outer periphery of the opening end of the tank body 310. A plurality of flange holes are provided at corresponding positions of the upper flange and the lower flange, and fasteners are inserted in the two opposite groups of flange holes on the upper flange and the lower flange.

[0032] In a specific embodiment of the present application, the heating unit 100 includes a dual circulation pump module 110 and an organic heat carrier furnace 120, the input end of the dual circulation pump module 110 is connected to the oil return pipe 317 and the output end of the heat-using device 200, the output end of the dual circulation pump module 110 is connected to the input end of the organic heat carrier furnace 120, and the output end of the organic heat carrier furnace 120 is connected to the input end of the heat-using device 200. The structure and operation principle of the dual circulation pump 110 module can refer to the prior art disclosed in Patent No. CN114508855A, which discloses an electric thermal oil furnace system capable of realizing wide range adjustment of output power.

[0033] In another embodiment of the present application, a low-level oil storage tank 500 is further included which is connected between the output end of the organic heat carrier furnace 120 and the input end of the heat-using device 200. When the temperature of the heat transfer oil inside the system is too high or the heat transfer oil is insufficient, the low-level oil storage tank 500 can be used for supplementary cooling.

[0034] In a heat transfer oil heat exchange system of the present invention, a heating unit 100 is connected to an expansion tank 400 through a buffer filter tank 300. When the heat transfer oil in the system expands due to heat, the heat transfer oil will enter through the expansion tube 312 and rush upward to lift the gravity plugging member 330, and enter the inner heat exchange chamber 314 located in the lower buffer oil area after being filtered by the oil filter plate 320. The high-temperature heat transfer oil entering the inner heat exchange chamber 314 will not overflow into the outer overflow chamber 315 until it is higher than the heat exchange overflow baffle 340, and then enter the expansion tank 400 through the oil outlet pipe 316. The high-temperature heat transfer oil will gradually cool down during the accumulation process in the inner heat exchange chamber 314. Low-temperature heat transfer oil can also be injected into the inner heat exchange chamber 314 in advance to speed up the cooling speed, so as to avoid the high-temperature heat transfer oil directly entering the expansion tank 400 and causing the temperature to be too high. When the gas generated in the system passes through the expansion tube 312, the gas can also lift the gravity plugging member and discharge the gas smoothly through the exhaust pipe 313. In addition, since the output end of the expansion tube 312 is exposed in the upper oil filter exhaust area, the gravity sealing member 330 can seal the output end of the expansion tube 312, thereby playing a sealing role to prevent the heat transfer oil in the tube from coming into direct contact with the external air during normal operation of the system, thereby preventing the heat transfer oil from oxidizing and increasing the service life of the heat transfer oil.

[0035] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A thermal oil heat exchange system, characterized in that: It includes a heating unit and a heat-using device connected through a circulation pipeline, and an expansion tank is connected to the upper position of the heating unit through a buffer filter tank, wherein: The buffer filter tank comprises a tank body, a tank cover is detachably mounted on the upper end of the tank body, an expansion pipe extending to the interior of the tank body is connected to the bottom of the tank body, the input end of the expansion pipe is connected to the heating unit, the tank cover is connected to the exhaust pipe, an oil filter plate is arranged inside the tank body and below the output end of the expansion pipe, the oil filter plate divides the interior of the tank body into an upper oil filter exhaust area and a lower buffer oil area, a heat exchange overflow baffle is arranged in the lower buffer oil area and at a position located on the outer periphery of the expansion pipe, the heat exchange overflow baffle divides the lower buffer oil area into an inner heat exchange cavity and an outer overflow cavity. The oil outlet of the oil filter plate corresponds to the input end of the inner heat exchange chamber, the outer overflow chamber is provided with an oil outlet pipe connected to the high-temperature oil input end of the expansion tank, the inner heat exchange chamber is provided with an oil return pipe connected to the heating unit, and the inner heat exchange chamber is provided with an oil replenishment pipe connected to the low-temperature oil output end of the expansion tank, and a gravity plugging member is provided at a position between the output end of the expansion tube and the input end of the exhaust pipe inside the tank body, and the bottom of the gravity plugging member can be movably sealed on the output end of the expansion tube, and the gas or heat transfer oil output by the expansion tube can lift the gravity plugging member upwards and discharge the gas or heat transfer oil.

2. A heat transfer oil heat exchange system according to claim 1, characterized in that: The gravity sealing member includes a gravity ball and an exhaust chamber, wherein the exhaust chamber is installed on the bottom of the tank cover and is connected to the exhaust pipe. A limiting opening is provided on the bottom of the exhaust chamber. The gravity ball is movably installed in the exhaust chamber and its lower end can extend to the outside of the limiting opening to movably seal on the output end of the expansion tube.

3. A heat transfer oil heat exchange system according to claim 2, characterized in that: A plurality of exhaust holes connected to the exhaust pipe are arranged on the top of the exhaust chamber.

4. The heat transfer oil heat exchange system according to claim 1, characterized in that: The oil filter plate is provided with an annular oil filter net, and the heat exchange overflow baffle is arranged around the outer periphery of the expansion tube and is arranged opposite to the outer ring of the annular oil filter net.

5. The heat transfer oil heat exchange system according to claim 1, characterized in that: A limit mounting ring is provided on the inner wall of the tank body and below the output end of the expansion tube, and a plurality of positioning holes are provided on the limit mounting ring. A mounting edge is provided on the outer periphery of the oil filter plate, and a plurality of mounting holes are provided on the mounting edge at positions corresponding to the positioning holes, and fastening bolts capable of cooperating with the corresponding positioning holes are movably inserted in the mounting holes.

6. The heat transfer oil heat exchange system according to claim 1, characterized in that: A sealing ring capable of cooperating with the inner wall of the opening of the tank body is provided on the bottom of the tank cover, an upper flange is provided on the outer periphery of the tank cover, and a lower flange is provided on the outer periphery of the opening end of the tank body. A plurality of flange holes are provided at corresponding positions of the upper flange and the lower flange, and fasteners are inserted into the two opposite groups of flange holes on the upper flange and the lower flange.

7. The heat transfer oil heat exchange system according to claim 1, characterized in that: The heating unit includes a dual-circulation pump module and an organic heat carrier furnace. The input end of the dual-circulation pump module is connected to the oil return pipe and the output end of the heat-using device. The output end of the dual-circulation pump module is connected to the input end of the organic heat carrier furnace. The output end of the organic heat carrier furnace is connected to the input end of the heat-using device.

8. The heat transfer oil heat exchange system according to claim 1, characterized in that: It also includes a low-level oil storage tank connected between the output end of the organic heat carrier furnace and the input end of the heat-using equipment.

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