Temperature control device for expander lubricating oil

Abstract

This utility model provides a temperature control and regulation device for expander lubricating oil, belonging to the field of oil cooling technology. It includes: an oil cooler, with its shell-side inlet connected to the lubricating oil inlet pipe and its shell-side outlet connected to the lubricating oil outlet pipe; its tube-side inlet connected to a cooling supply pipe and its tube-side outlet connected to a chilled water circuit, which in turn is connected to a circulating water tank; a first temperature detector is installed on the outlet pipe; the cooling supply pipe has a chilled water branch and a chilled water branch connected via a tubular mixer; the chilled water branch is connected to a chilled water tank and a chilled water pump; the chilled water branch is connected to a refrigeration unit and a chilled water pump, and a first check valve, a chilled water regulating valve, and a second pressure detector are sequentially installed along the water flow direction on the chilled water branch. This device can achieve precise control of the lubricating oil temperature, effectively reducing the lubricating oil temperature to a suitable range, improving the operational stability of the expander, and ensuring the continuity and efficiency of the production process.

Description

Technical Field

[0001] This utility model relates to the field of oil cooling technology, and in particular to a temperature control and regulation device for expander lubricating oil. Background Technology

[0002] In the production process of cryogenic refrigeration equipment, the expander, as the core equipment providing cooling capacity, plays a crucial role. Due to its high-speed characteristics, it generates high temperatures during operation, making lubrication a particularly important issue. If the lubricating oil temperature is too high, the lubrication and cooling effectiveness of the moving mechanical parts will be poor, not only increasing the operating burden of the equipment but also potentially leading to performance degradation or even damage. Conversely, if the lubricating oil temperature is too low, the viscosity increases, reducing fluidity, and the moving mechanical parts will not receive timely and sufficient lubrication and cooling, accelerating wear. Therefore, ensuring that the lubricating oil temperature is always maintained within the normal range is of paramount importance for ensuring the stable operation of the expander and extending the equipment's service life.

[0003] Existing expanders typically employ water cooling technology in their lubrication systems, where the lubricating oil is cooled by a dedicated oil cooler. However, in actual operation, lubricating oil temperature control is unstable, especially under the influence of high temperatures in summer. This can cause the cooling water temperature to rise, resulting in insufficient cooling water supply and preventing the lubricating oil from achieving the required cooling effect, thus affecting the normal operation of the expander. Therefore, a new temperature control and regulation device for expander lubricating oil is needed to solve the above problems. Utility Model Content

[0004] This invention provides a temperature control and regulation device for expander lubricating oil, which solves the problems of cooling effect and difficulty in controlling and regulating oil temperature of expander lubricating oil in the prior art.

[0005] This utility model provides a temperature control and regulation device for expander lubricating oil, comprising: an oil cooler, which is a shell-and-tube heat exchanger; the shell-side inlet of the oil cooler is connected to the lubricating oil inlet pipe, and the shell-side outlet is connected to the lubricating oil outlet pipe; the tube-side inlet of the oil cooler is connected to the cooling supply pipe, and the tube-side outlet is connected to the chilled water circuit, which is connected to the circulating water tank; a first temperature detector is provided on the outlet pipe; the cooling supply pipe has two branches, one for chilled water and one for frozen water, which are connected by a tubular mixer; the chilled water branch is connected to a chilled water tank and a chilled water pump in sequence along the water flow direction, and is equipped with a chilled water regulating valve and a first pressure detector; the frozen water branch is connected to a refrigeration unit and a chilled water pump in sequence along the water flow direction, and is equipped with a first check valve, a frozen water regulating valve, and a second pressure detector in sequence along the water flow direction.

[0006] Furthermore, the tubular mixer consists of an inlet pipe, a mixing pipe, and an outlet pipe coaxially connected; the inlet pipe is connected to a cold water branch; a fluid input pipe is vertically connected to the inlet pipe, and the fluid input pipe is connected to a chilled water branch; the outlet pipe is connected to the tube-side inlet of the oil cooler via a cooling supply line; the inlet and outlet pipes have the same diameter, and the diameter of the mixing pipe is 2-3 times the diameter of the inlet pipe; a baffle is provided at 1 / 3 of the axial direction of the mixing pipe, and a deflector is provided at 3 / 4 of the axial direction. The cross-sectional area of ​​the baffle is the same as that of the inlet pipe, and the cross-sectional area of ​​the deflector is 1.5 times that of the inlet pipe; the baffle, deflector, and mixing pipe are coaxially arranged, and the baffle, deflector, and mixing pipe are fixedly connected by multiple positioning rods.

[0007] Furthermore, both the baffle and the deflector are square structures, and they are installed with a 45° offset angle in the axial direction.

[0008] Furthermore, the oil inlet pipeline is used to transport high-temperature lubricating oil that needs to be cooled, and a second temperature detector and a shut-off valve are installed on the oil inlet pipeline.

[0009] Furthermore, the oil outlet line is used to transport the cooled lubricating oil, and a second check valve is also installed on the oil outlet line.

[0010] Furthermore, an oil filter is installed on the oil outlet line to filter the cooled lubricating oil.

[0011] Furthermore, both the cold water pump and the chilled water pump are equipped with a backup pump.

[0012] Furthermore, a controller is also provided on one side of the oil cooler, and the controller is electrically connected to the first temperature detector, the chilled water regulating valve, the cold water regulating valve, the first pressure detector, and the second pressure detector.

[0013] The temperature control device for expander lubricating oil provided by this utility model effectively reduces the temperature of the lubricating oil to a suitable range by diverting low-temperature chilled water to a relatively high-temperature medium and utilizing the cooling effect of the low-temperature chilled water. This achieves the purpose of precise control of the lubricating oil temperature, which not only ensures the stability of the lubricating oil temperature, but also further improves the overall stability of the expander during operation, effectively reduces equipment failures caused by oil temperature fluctuations, extends equipment service life, and ensures the continuity and efficiency of the production process.

[0014] The device enables remote control and automated adjustment through a controller. By setting up a tubular mixer, it provides a better mixing effect for cooling water and chilled water, ensuring that the cooling water and chilled water are evenly mixed before entering the oil cooler. This results in better cooling effect and more stable lubricating oil temperature after cooling, further ensuring a constant lubricating oil temperature. This meets the lubrication and cooling needs of the expander and reduces its lubricating oil change cycle, thereby improving the safety and stability of the expander operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of the temperature control and regulation device for the expander lubricating oil provided in one embodiment of this utility model; Figure 2 A schematic diagram of the structure of a tubular mixer provided in one embodiment of this utility model; Figure 3 for Figure 2 A schematic diagram of the structure in the AA direction.

[0017] Explanation of reference numerals in the attached figures: 1-Oil cooler, 2-Tube mixer, 3-Oil filter, 4-Controller, 11-Oil inlet pipe, 12-Oil outlet pipe, 13-Cooling supply pipe, 14-Cold water circuit, 15-Cold water branch, 16-Chilled water branch, 21-Inlet pipe, 22-Mixing pipe, 23-Outlet pipe, 24-Fluid input pipe, 25-Baffle plate, 26-Baffle plate, 111-Second temperature sensor, 112-Stop valve, 121-First temperature sensor, 122-Second check valve, 141-Circulating water tank, 151-Cold water tank, 152-Cold water pump, 153-Cold water regulating valve, 154-First pressure sensor, 161-Refrigeration unit, 162-Chilled water pump, 163-First check valve, 164-Chilled water regulating valve, 165-Second pressure sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0019] like Figure 1 This utility model discloses a temperature control and regulation device for expander lubricating oil, comprising: an oil cooler 1, which is a shell-and-tube heat exchanger; the shell-side inlet of the oil cooler 1 is connected to the lubricating oil inlet pipe 11, and the shell-side outlet is connected to the lubricating oil outlet pipe 12; the tube-side inlet of the oil cooler 1 is connected to the cooling supply pipe 13, and the tube-side outlet is connected to the cold water circuit 14, which is connected to the circulating water tank 141; a first temperature detector 121 is provided on the oil outlet pipe 12; the cooling supply pipe 13 has two branches, one of which is a cooling... Water branch 15, one branch is a chilled water branch 16, the chilled water branch 15 and the chilled water branch 16 are connected by a tubular mixer 2; the chilled water branch 15 is connected in sequence to a chilled water tank 151 and a chilled water pump 152 along the water flow direction, and a chilled water regulating valve 153 and a first pressure detector 154 are provided on the chilled water branch 15; the chilled water branch 16 is connected in sequence to a refrigeration unit 161 and a chilled water pump 162 along the water flow direction, and a first check valve 163, a chilled water regulating valve 164 and a second pressure detector 165 are provided in sequence on the chilled water branch 16 along the water flow direction.

[0020] The heat transfer medium in the oil cooler 1 is lubricating oil. The lubricating oil to be cooled enters the shell side of the oil cooler 1 through the oil inlet pipe 11. After cooling, it is sent back to the expander for circulation through the oil outlet pipe 12. The tube side flows with a cold medium, which consists of cooling water and chilled water. The cooling water branch 15 and the chilled water branch 16 can be used separately or together, providing multiple solutions for the use of the cold medium in the oil cooler 1 and making it more adaptable to different operating environments. The cold medium after heat exchange is sent to the circulating water tank 141 through the cooling water circuit 14, where it can be used for cooling or freezing and then recycled or used for other purposes, saving water resources. When using cooling water alone, the cooling effect is not good. Therefore, the solution with the best cooling effect is to mix the cooling water and chilled water in the tubular mixer 2 before entering the tube side, providing the oil cooler 1 with a lower cold medium temperature, so that the temperature of the lubricating oil can be reduced more significantly, while avoiding the disadvantages of excessive water production energy consumption and / or excessively low oil temperature when using chilled water alone.

[0021] The chilled water branch 16 is equipped with commonly used insulation measures to reduce chilled water cooling loss. Based on the data from the second pressure gauge 165 and the first pressure gauge 154, the chilled water pressure in the chilled water branch 16 must be equal to or slightly higher than the cooling water pressure in the cold water branch 15. The chilled water primarily enhances the cooling effect. The first temperature gauge 121 measures the temperature of the lubricating oil in the oil line 12 after cooling. The chilled water flow rate in the chilled water branch 16 can be controlled by adjusting the opening of the chilled water regulating valve 164 according to the instantaneous oil temperature measured by the first temperature gauge 121. This introduces chilled water with a lower temperature for merging with the cooling water, achieving temperature compensation and preventing the cooling water from overheating due to external high temperatures, thus ensuring a constant lubricating oil temperature after cooling. This effectively reduces equipment failures caused by oil temperature fluctuations, meets the lubrication and cooling needs of the expander, and reduces its lubricating oil change cycle, thereby improving the safety and stability of the expander's operation, as well as overall production efficiency and equipment reliability.

[0022] like Figure 2 Preferably, the tubular mixer 2 is coaxially connected by an inlet pipe 21, a mixing pipe 22, and an outlet pipe 23; the inlet pipe 21 is connected to the cold water branch 15; a fluid input pipe 24 is vertically connected to the inlet pipe 21, and the fluid input pipe 24 is connected to the chilled water branch 16; the outlet pipe 23 is connected to the tube-side inlet of the oil cooler 1 through a cooling supply pipe 13; the inlet pipe 21 and the outlet pipe 23 have the same diameter, and the diameter of the mixing pipe 22 is 2 times the diameter of the inlet pipe 21. -3 times; the mixing pipe 22 is provided with a baffle 25 at 1 / 3 of the axial direction and a baffle 26 at 3 / 4 of the axial direction. The cross-sectional area of ​​the baffle 25 is the same as that of the inlet pipe 21, and the cross-sectional area of ​​the baffle 26 is 1.5 times that of the inlet pipe 21. The baffle 25, the baffle 26 and the mixing pipe 22 are coaxially arranged, and the baffle 25, the baffle 26 and the mixing pipe 22 are fixedly connected by multiple positioning rods.

[0023] The tubular mixer 2, through the baffle 25 and deflector 26, causes the liquid in the mixing tube 22 to change its flow angle multiple times during the flow process, transforming it from a steady flow state to a turbulent flow state. This achieves a good mixing effect during the flow process, ensuring that the cooling water and chilled water are evenly mixed before entering the oil cooler 1, resulting in better cooling effect and more stable lubricating oil temperature after cooling. The diameter of the mixing tube 22 is larger than that of the inlet pipe 21, slowing down the liquid flow velocity. The area of ​​the baffle 25 and deflector 26 is smaller, resulting in low flow resistance. When the liquid converges at the inlet of the outlet pipe 23, it can flow normally without the need for a separate power booster device. This tubular mixer 2 can be integrated with the cooling supply pipeline 13, saving installation space.

[0024] like Figure 3Preferably, both the baffle plate 25 and the deflector plate 26 are square structures, and they are installed with a 45° offset angle in the axial direction. The offset installation of the baffle plate 25 and the deflector plate 26 allows them to cut the water flow at multiple angles and directions. Although the angle of change in flow direction is small each time, it can further increase the turbulent mixing effect.

[0025] like Figure 1 Preferably, the oil inlet pipe 11 is used to transport high-temperature lubricating oil to be cooled, and a second temperature detector 111 and a shut-off valve 112 are installed on the oil inlet pipe 11. The oil inlet pipe 11 facilitates the introduction of high-temperature lubricating oil into the oil cooler 1, promoting heat exchange between the lubricating oil and the cooling medium, thereby cooling the lubricating oil.

[0026] like Figure 1 Preferably, the oil outlet pipe 12 is used to transport cooled lubricating oil, and a second check valve 122 is also provided on the oil outlet pipe 12. The oil outlet pipe 12 leads out the cooled lubricating oil, realizing the return of lubricating oil to the expander for reuse, thereby maintaining the continuous operation of the expander.

[0027] like Figure 1 Preferably, an oil filter 3 is also installed on the oil outlet pipe 12. The oil filter 3 is used to filter the cooled lubricating oil. The oil filter 3 facilitates the filtration of the cooled lubricating oil, preventing impurities carried by the lubricating oil when it is discharged from the expander at high temperature from returning to the expander after cooling and causing contamination or structural damage to the expander.

[0028] Preferably, both the chilled water pump 152 and the chilled water pump 162 are equipped with a standby pump. The presence of standby pumps in the chilled water pump 152 and the chilled water pump 162 ensures that the standby pumps can start quickly in the event of a main pump failure, thereby minimizing oil temperature fluctuations and ensuring stable operation of the expander.

[0029] like Figure 1 Preferably, a controller 4 is also provided on one side of the oil cooler 1. The controller 4 is electrically connected to the first temperature detector 121, the chilled water regulating valve 164, the cold water regulating valve 153, the first pressure detector 154, and the second pressure detector 165. The controller 4 is equipped with a control system and program commonly used in the art. By preset the lubricating oil temperature range on the oil outlet pipeline 12 and the oil temperature status reflected in real time by the first temperature detector 121, the controller adjusts and controls the flow rate of the cold medium in the cold water branch 15 and the chilled water branch 16, so that the temperature of the lubricating oil can be controlled within the optimal operating range.

[0030] The present invention will be further described in detail below with reference to specific embodiments. Example 1

[0031] The temperature control device for the expander lubricating oil works as follows: During operation, the oil inlet pipe 11 facilitates the introduction of high-temperature lubricating oil into the oil cooler 1. The controller 4 opens the cooling water regulating valve 153, allowing cooling water to sequentially pass through the cooling water branch 15, the tubular mixer 2, and the cooling supply pipe 13 into the tube side of the oil cooler 1. After heat exchange with the hot lubricating oil in the shell side, the cooling water outlet pipe 12 leads out the cooled lubricating oil, filters it through the oil filter 3, and returns it to the expander, thus achieving the return and reuse of lubricating oil in the expander and maintaining the continuous operation of the expander. The cooled water after heat exchange is returned to the circulating water tank 141 through the cooling water circuit 14.

[0032] When the temperature value detected by the first temperature sensor 121 is too high or higher than the predetermined value, the controller 4 opens the chilled water regulating valve 164 to introduce chilled water into the tubular mixer 2. Simultaneously, attention should be paid to the detection data of the second pressure sensor 165 and the first pressure sensor 154, ensuring that the water pressure of the chilled water in the chilled water branch 16 is equal to or slightly higher than the water pressure of the cooling water in the cold water branch 15. After the cooling water and chilled water are initially mixed in the inlet pipe 21, they enter the mixing pipe 22. Passing through the baffle 25 and deflector 26, the flow angle changes multiple times, transitioning from a steady flow state to a turbulent flow state, achieving uniform mixing during the flow process. The mixture is then sent to the cooling supply pipeline 13 through the outlet pipe 23. If the temperature value detected by the first temperature sensor 121 is too low or lower than the predetermined value, the controller 4 adjusts the opening of the chilled water regulating valve 164 or closes it to ensure that the temperature of the lubricating oil is controlled within the optimal operating range. Example 2

[0033] Based on the above embodiments, in this embodiment, the oil inlet pipe 11 facilitates the introduction of lubricating oil with an initial temperature of 60°C into the oil cooler 1. The controller 4 controls the opening of the cold water regulating valve 153, allowing cooling water with a temperature of 20-35°C and a pressure of 0.42 MPa to sequentially pass through the cold water branch 15, the tubular mixer 2, and the cooling supply pipe 13 into the tube side of the oil cooler 1, with a flow rate of approximately 10 tons / hour. After heat exchange between the cooling water and the hot lubricating oil in the shell side, the oil outlet pipe 12 leads out the cooled lubricating oil. After this cooling process, the temperature of the lubricating oil is reduced to 49°C. The cooled water after heat exchange is returned to the circulating water tank 141 through the cold water circuit 14.

[0034] However, to achieve a more efficient cooling effect and further reduce the lubricating oil temperature, controller 4 opens the chilled water regulating valve 164, introducing chilled water at a temperature of 11℃ and a pressure of not less than 0.42MPa into the tubular mixer 2, further reducing the lubricating oil temperature to 46℃, thereby meeting the higher operating requirements of the expander. When the lubricating oil temperature is lower than the set threshold (45℃), controller 4 closes the chilled water regulating valve 164 to adjust the chilled water flow, ensuring that the lubricating oil temperature does not fall below 45℃.

[0035] It should be noted that the detailed structure of some devices in this utility model is not described in detail, but belongs to the prior art known to those skilled in the art, and therefore will not be described again here. In addition, the parts of this device not described are the same as or can be implemented using existing technology.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A temperature control adjusting device for lubricating oil of an expander, characterized by comprising: include: An oil cooler, wherein the oil cooler is a shell-and-tube heat exchanger; the shell-side inlet of the oil cooler is connected to the oil inlet pipeline of the lubricating oil, and the shell-side outlet is connected to the oil outlet pipeline of the lubricating oil. The inlet of the oil cooler is connected to the cooling supply pipeline, and the outlet of the oil cooler is connected to the cold water circuit, which is connected to the circulating water tank; a first temperature detector is installed on the oil outlet pipeline. The cooling pipeline has two branches: a cold water branch and a chilled water branch, which are connected by a tubular mixer. The cold water branch is connected to a cold water tank and a cold water pump in sequence along the water flow direction, and is equipped with a cold water regulating valve and a first pressure detector. The chilled water branch is connected to a refrigeration unit and a chilled water pump in sequence along the water flow direction, and is equipped with a first check valve, a chilled water regulating valve, and a second pressure detector in sequence along the water flow direction.

2. The temperature-controlled lubricating oil regulating device for an expander according to claim 1, characterized by The tubular mixer is coaxially connected by an inlet pipe, a mixing pipe, and an outlet pipe; the inlet pipe is connected to the cold water branch; a fluid input pipe is vertically connected to the inlet pipe, and the fluid input pipe is connected to the chilled water branch; the outlet pipe is connected to the tube-side inlet of the oil cooler through the cooling supply pipe. The inlet pipe and the outlet pipe have the same diameter, and the diameter of the mixing pipe is 2-3 times that of the inlet pipe. The mixing pipe has a baffle plate at 1 / 3 of its axial length and a deflector plate at 3 / 4 of its axial length. The cross-sectional area of ​​the baffle plate is the same as that of the inlet pipe, and the cross-sectional area of ​​the deflector plate is 1.5 times that of the inlet pipe. The baffle plate, the deflector plate, and the mixing pipe are coaxially arranged, and the baffle plate, the deflector plate, and the mixing pipe are fixedly connected by multiple positioning rods.

3. The temperature-controlled lubricating oil regulating device for an expander according to claim 2, characterized by Both the baffle and the deflector are square structures, and the baffle and the deflector are installed with a 45° offset angle in the axial direction.

4. The temperature-controlled lubricating oil regulating device for an expander according to claim 1, characterized by The oil inlet pipeline is used to transport high-temperature lubricating oil that needs to be cooled, and a second temperature detector and a shut-off valve are installed on the oil inlet pipeline.

5. The temperature control and regulation device for expander lubricating oil according to claim 1, characterized in that, The oil outlet pipeline is used to transport cooled lubricating oil, and a second check valve is also provided on the oil outlet pipeline.

6. The temperature-controlled lubricating oil regulating device for an expander according to claim 5, characterized by An oil filter is also installed on the oil outlet line, which is used to filter the cooled lubricating oil.

7. The temperature-controlled lubricating oil regulating device for an expander according to claim 1, characterized by Both the cold water pump and the chilled water pump are equipped with a standby pump.

8. A temperature-regulated lubricating oil supply device for an expander according to any one of claims 1 to 7, characterized in that A controller is also provided on one side of the oil cooler. The controller is electrically connected to the first temperature detector, the chilled water regulating valve, the cold water regulating valve, the first pressure detector, and the second pressure detector.

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