A novel mechanical seal cooling system for high-temperature asphalt pumps

Abstract

This utility model discloses a novel mechanical seal cooling system for high-temperature asphalt pumps, belonging to the field of cooling devices. It includes an oil tank connected to a gear oil pump. A filter unit is installed on the oil tank, comprising a double-barrel filter, a pipeline, and a one-way valve. The double-barrel filter is fixed to one end of the oil tank, and its inlet is connected to the pipeline. One end of the pipeline is connected to the gear oil pump, and the one-way valve is located at the connection between the gear oil pump and the pipeline. A cooling unit is installed on the oil tank to cool the lubricating oil flowing from the double-barrel filter. This novel mechanical seal cooling system for high-temperature asphalt pumps, through the cooperation of the oil tank and gear oil pump, uses a thin oil lubrication station for forced flushing, filters impurities through the double-barrel filter, cools through a tubular cooler, and finally delivers the oil to the seal cavity at a pressure of 0.6-0.8 MPa for cooling. The closed-loop return oil circulation stabilizes the flow rate, solves pressure fluctuation problems, extends the life of the mechanical seal, and improves product quality and production stability.

Description

Technical Field

[0001] This utility model relates to the field of cooling device technology, and in particular to a novel mechanical seal cooling system for high-temperature asphalt pumps. Background Technology

[0002] In modern industry, high-temperature asphalt pumps, as key equipment for conveying high-temperature, high-viscosity asphalt, are widely used in road construction, petrochemicals, asphalt production, and many other industries. Their stable operation is crucial for ensuring smooth production processes. Mechanical seals, as one of the core components of high-temperature asphalt pumps, play a vital role in preventing media leakage and ensuring efficient pump operation. The mechanical seal cooling system is an important guarantee for ensuring the normal operation of the mechanical seal.

[0003] Existing high-temperature asphalt pump mechanical seal cooling systems primarily work by using a cooling medium to remove the heat generated during operation, thus maintaining the mechanical seal's normal operating temperature. In common structures, the sealing material is typically made of materials with certain high-temperature resistance and wear resistance, while the auxiliary sealing ring often uses oil-resistant and high-temperature-resistant rubber materials such as fluororubber. The most common cooling methods are air cooling and water cooling. Air cooling systems usually utilize fans or natural convection to allow air to flow over the mechanical seal surface, carrying away heat. This method is relatively simple and low-cost, but its cooling efficiency is limited. Water cooling systems, on the other hand, use circulating water or other coolant flowing through cooling channels around the sealing cavity to absorb heat.

[0004] In the process of transporting high-temperature asphalt, the aforementioned cooling methods require precise control of the flushing and cooling pressure and flow rate of the mechanical seal to ensure good lubrication and cooling of the sealing surface. However, existing cooling systems often fail to meet this requirement, resulting in large pressure fluctuations and unstable flow rates. Excessive pressure increases the load on the sealing surface and accelerates the wear of the sealing material; insufficient pressure fails to effectively remove heat, leading to increased sealing surface temperature. Similarly, excessive or insufficient flow rates also negatively impact the sealing effect, affecting product quality and production stability. Therefore, a novel mechanical seal cooling system specifically designed for high-temperature asphalt pumps is needed.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0006] This utility model provides a novel mechanical seal cooling system for high-temperature asphalt pumps to solve the problem that existing devices cannot meet the pressure and flow control requirements for mechanical seal flushing and cooling during high-temperature asphalt transportation, resulting in unstable pressure and flow, which affects the sealing effect and production stability.

[0007] The present invention adopts the following technical solution: a novel mechanical seal cooling system for high-temperature asphalt pumps, mainly comprising an oil tank, on which a gear oil pump is connected and installed. A filter unit is installed on the oil tank, the filter unit comprising a double-barrel filter, a pipeline, and a one-way valve. The double-barrel filter is fixed on the oil tank near one end, and the oil inlet end of the double-barrel filter is connected to the pipeline. One end of the pipeline is connected to the gear oil pump. The one-way valve is located at the connection between the gear oil pump and the pipeline. The oil tank is provided with a cooling unit for cooling the lubricating oil flowing out of the double-barrel filter.

[0008] Furthermore, the cooling unit includes a tubular cooler, two sets of support parts, and a third pipe. The support parts include pipe supports and retaining rings. The tubular cooler is fixed to the oil tank by the two sets of support parts. The oil outlet of the dual-barrel filter is connected to a second pipe. One end of the second pipe is connected to the tubular cooler. The tubular cooler is connected to a third pipe. One end of the third pipe has an oil outlet, which is connected to the mechanical seal cooling chamber.

[0009] Furthermore, the tubular cooler has an outlet and an inlet connected side by side to facilitate the circulation of the cooling medium.

[0010] Furthermore, the oil tank is equipped with a differential pressure regulating valve, which is connected to the second pipeline via a pipeline to monitor the pressure changes of the oil in the second pipeline in real time.

[0011] Furthermore, a vertically installed thermometer is connected to the third pipe near the oil outlet. The thermometer is used to detect the real-time temperature of the lubricating oil that is about to be delivered to the mechanical seal cooling chamber.

[0012] Furthermore, the oil tank is connected to an oil return port, which is used to guide the lubricating oil back to the oil tank to form a closed-loop circulation.

[0013] Furthermore, the oil tank is equipped with a liquid level indicator, which is used to display the liquid level of the lubricating oil inside the oil tank in real time.

[0014] Furthermore, one end of the pipeline has an oil drain port, which is used to completely drain the waste lubricating oil or residual oil from the oil tank, pipeline and related components.

[0015] Furthermore, the oil tank is equipped with a heater, which is used to heat the lubricating oil in the oil tank in a low-temperature environment.

[0016] Furthermore, an explosion-proof control cabinet is fixed on the oil tank, and the explosion-proof control cabinet is used for centralized control of electrical components in the cooling system.

[0017] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0018] A novel mechanical seal cooling system for high-temperature asphalt pumps effectively solves the technical problems of large pressure fluctuations and unstable flow rates in existing cooling systems through the coordinated design of the oil tank, gear oil pump, filter unit, and cooling unit. By employing a forced flushing cooling mode using a thin oil lubrication station, the gear oil pump draws lubricating oil from the tank and delivers it to a double-barrel filter via a one-way valve. Impurities are filtered out with a filtration accuracy of 0.08mm, preventing them from affecting the sealing effect. The lubricating oil is then cooled by a tubular cooler and finally delivered to the mechanical seal cavity at a pressure of 0.6-0.8MPa for flushing and cooling. This avoids both excessively high pressure increasing the load on the sealing surface and accelerating wear, and excessively low pressure failing to effectively remove heat, leading to an increase in the sealing surface temperature. Simultaneously, the return oil, after being filtered by the double-barrel filter to adsorb particulates, returns to the oil tank, forming a closed-loop circulation and ensuring stable flow rates. This not only ensures good lubrication and cooling of the sealing surface and avoids the adverse effects of abnormal flow rates on the sealing effect, but also further extends the service life of the mechanical seal, ultimately improving product quality and production stability. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] In the attached diagram:

[0021] Figure 1 This is a front view of the mechanical seal cooling system in this application;

[0022] Figure 2 This is a top view of the mechanical seal cooling system;

[0023] Figure 3 Left view of the mechanical seal cooling system;

[0024] Figure label:

[0025] 1. Dual-barrel filter; 101. Pipeline II; 2. Gear oil pump; 3. Shell and tube cooler; 31. Pipeline support; 32. Snap ring; 33. Water outlet; 34. Water inlet; 35. Pipeline III; 36. Oil outlet; 4. Differential pressure regulating valve; 5. Thermometer; 6. Liquid level indicator; 7. Drain valve; 8. Oil tank; 81. Oil return port; 9. Heater; 10. Explosion-proof control cabinet; 11. Check valve; 12. Oil drain port. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] Reference Figures 1-3 As shown in the figure, the present invention provides a novel mechanical seal cooling system for high-temperature asphalt pumps, including an oil tank 8, which stores lubricating oil to continuously provide cooling medium for the system. A gear oil pump 2 is connected and installed on the oil tank 8. The gear oil pump 2 is adapted to draw out the lubricating oil from the oil tank 8 to provide power for the circulation of the oil and drive the lubricating oil to circulate within the system.

[0029] Furthermore, a filter unit is installed on the oil tank 8. This filter unit includes a double-barrel filter 1, a pipeline 1, and a one-way valve 11. The double-barrel filter 1 is fixed on the oil tank 8 near one end. The double-barrel filter 1 is a double-barrel mesh filter. The filtration accuracy of the double-barrel filter 1 is usually 0.08mm, which can effectively filter out impurities in the lubricating oil and prevent impurities from entering subsequent components and causing wear or blockage. The oil inlet end of the double-barrel filter 1 is connected to a pipeline 1 (not shown in the figure). One end of the pipeline 1 is connected to the gear oil pump 2. The one-way valve 11 is set at the connection between the gear oil pump 2 and the pipeline 1 to prevent oil backflow and ensure that the oil flows unidirectionally and stably to the double-barrel filter 1. Thus, the lubricating oil is drawn out of the oil tank 8 by the gear oil pump 2 and then enters the double-barrel filter 1 through the one-way valve 11.

[0030] A cooling unit is installed on the oil tank 8. The cooling unit includes a tubular cooler 3, two sets of support parts, and a pipe 35. The support parts include pipe supports 31 and retaining rings 32. The tubular cooler 3 is fixed to the oil tank 8 by the two sets of support parts. The pipe supports 31 of the support parts are arc-shaped. The pipe supports 31 of the two sets of support parts are spaced apart to provide even support for the tubular cooler 3, ensuring its stable installation and avoiding damage or displacement due to uneven force. The retaining rings 32 have a U-shaped structure and are inserted into the pipe supports 31. The two ends of the retaining rings 32 are threaded. When the retaining rings 32 are inserted into the pipe supports 31 to hold the tubular cooler 3, nuts are threaded to the two ends of the retaining rings 32 to firmly fix the tubular cooler 3, further enhancing the installation stability.

[0031] Meanwhile, a second pipe 101 is connected to the oil outlet port of the double-barrel filter 1. One end of the second pipe 101 is connected to the shell-and-tube cooler 3, so that after entering the double-barrel filter 1 through the one-way valve 11, it enters the shell-and-tube cooler 3 through the second pipe 101 for cooling. The shell-and-tube cooler 3 uses heat exchange between the tube side and the shell side to transfer the heat of the lubricating oil to the cooling medium (usually water) to cool the lubricating oil. A third pipe 35 is connected to the shell-and-tube cooler 3. One end of the third pipe 35 has an oil outlet 36, which is suitable for connecting to the mechanical seal cooling chamber. This allows the lubricating oil cooled by the shell-and-tube cooler 3 to be delivered to the mechanical seal cooling chamber at a pressure of 0.6-0.8 MPa for flushing and cooling, removing the heat generated by friction and other factors from the mechanical seal, and ensuring that the mechanical seal operates at a suitable temperature.

[0032] Furthermore, the tubular cooler 3 is connected to an outlet 33 and an inlet 34 in parallel. The cooling medium enters the tubular cooler 3 from the inlet 34, completes heat exchange, and is discharged from the outlet 33, thus realizing the circulation of the cooling medium and continuously supporting the cooling function of the tubular cooler 3.

[0033] Meanwhile, a differential pressure regulating valve 4 is also installed on the oil tank 8. The differential pressure regulating valve 4 is connected to the second pipe 101 through a pipeline. Its function is to monitor the pressure change of the oil in the second pipe 101 in real time. When the pressure in the second pipe 101 fluctuates due to the blockage of the double barrel filter 1 or other reasons, the differential pressure regulating valve 4 can automatically adjust its opening to control the flow of oil, thereby ensuring the stability of the oil pressure and flow rate entering the shell and tube cooler 3, and providing reliable pressure and flow guarantee for the subsequent oil to enter the shell and tube cooler 3 in a suitable state for cooling.

[0034] Specifically, a vertically installed thermometer 5 is connected to the pipeline 35 near the oil outlet 36. The thermometer 5 is used to detect the real-time temperature of the lubricating oil that is about to be delivered to the mechanical seal cooling chamber. Its vertical installation can reduce the interference of oil flow on temperature detection and ensure accurate readings.

[0035] Specifically, the oil tank 8 is equipped with a liquid level indicator 6, which is used to display the liquid level of the lubricating oil inside the oil tank 8 in real time. It is usually made of transparent material or has a scale structure design, so that the staff can intuitively observe the remaining oil.

[0036] Specifically, the oil tank 8 is connected to an oil return port 81, which is used to guide the redundant lubricating oil that has been adsorbed by the double barrel filter 1 and has not entered the subsequent cooling process, or the lubricating oil that has been flushed and cooled by the mechanical seal cooling chamber, back to the oil tank 8 to form a closed loop circulation.

[0037] Specifically, one end of the pipeline has an oil drain port 12. This oil drain port 12 is used to completely drain the waste lubricating oil or residual oil from the oil tank 8, pipeline, and related components during system maintenance, repair, or lubricant replacement. It is located at the end of the pipeline. When the lubricating oil ages, becomes contaminated, or its performance deteriorates (such as abnormal viscosity or excessive impurities) due to long-term use, the old oil can be completely drained through the oil drain port 12 to prevent the mixing of new and old oil from affecting the cooling effect. When repairing components such as the dual-barrel filter 1 and gear oil pump 2, opening the oil drain port 12 can release the pressure inside the pipeline, prevent oil leakage and environmental pollution, and facilitate the thorough cleaning of impurities and deposits inside the pipeline. In addition, the oil drain port 12 is equipped with a shut-off valve (not shown in the figure). It is normally closed to ensure the system's sealing. It can be opened when oil needs to be drained. The operation is simple and efficient, providing a key interface for regular system maintenance and oil replacement, ensuring that the cooling system maintains a good oil condition for a long time, and indirectly ensuring the cooling and lubrication effect on the mechanical seal.

[0038] Specifically, the oil tank 8 is equipped with a heater 9, which is used to heat the lubricating oil in the oil tank 8 in low-temperature environments (such as winter startup or restarting after a long period of shutdown). It usually adopts electric heating and is mostly installed at the bottom of the oil tank 8 or in the oil immersion area to ensure that the heat is evenly transferred to the oil. By raising the temperature of the lubricating oil to a suitable range through the heater 9, the viscosity of the oil can be reduced, its fluidity can be restored, and the gear oil pump 2 can easily draw oil and ensure stable pressure. This ensures that the oil can quickly circulate to the shell and tube cooler 3 and the mechanical seal cooling chamber after the system starts up. At the same time, it avoids excessive impact on the filter screen of the double barrel filter 1 due to low temperature and high viscosity oil, thus extending the service life of the filter components.

[0039] Specifically, an explosion-proof control cabinet 10 is fixed on the oil tank 8. The explosion-proof control cabinet 10 is used to centrally control the operation of electrical components (such as gear oil pump 2, heater 9, temperature control module, etc.) in the cooling system. The outer shell of the explosion-proof control cabinet 10 is made of cast aluminum or stainless steel, which can prevent the sparks and high temperatures generated when the internal electrical components are working from coming into contact with the external flammable and explosive environment (such as oil mist that may evaporate near the oil tank), thus avoiding safety accidents.

[0040] Specifically, a drain valve 7 is connected to the bottom of the oil tank 8. The drain valve 7 is used to discharge impurities, moisture and aged oil residue deposited at the bottom of the oil tank 8. That is, due to the long-term circulation of lubricating oil, some tiny impurities that are not completely filtered out by the double barrel filter 1 will settle to the bottom of the oil tank due to gravity. At the same time, moisture in the air may seep into the oil and accumulate at the bottom.

[0041] Working Principle: After system startup, the lubricating oil stored in oil tank 8, acting as a cooling medium, is drawn out by gear oil pump 2 and enters double-barrel filter 1 through check valve 11. Double-barrel filter 1 removes impurities from the oil with a filtration accuracy of 0.08mm, preventing wear or blockage of subsequent components. The filtered oil is then transported to shell-and-tube cooler 3 via pipe 2 101. At this time, cooling medium (such as water) enters the shell side of shell-and-tube cooler 3 from inlet 34, exchanging heat with the lubricating oil in the tube side. This removes the heat absorbed by the lubricating oil from the mechanical seal. The heated cooling medium is discharged from outlet 33, while the cooled lubricating oil is transported to outlet 36 via pipe 3 35, ultimately entering the mechanical seal cooling chamber at a pressure of 0.6-0.8MPa to complete the flushing and cooling of the mechanical seal. The used lubricating oil flows back to oil tank 8 through return port 81, forming a closed-loop cycle and continuously providing stable cooling for the mechanical seal.

[0042] During the oil circulation process, the differential pressure regulating valve 4 is connected to pipe 101 via a pipeline to monitor the pressure changes in the pipeline in real time. When the pressure of the dual-barrel filter 1 fluctuates due to the accumulation of impurities, it automatically adjusts its opening to stabilize the oil flow and pressure, ensuring that the oil entering the shell-and-tube cooler 3 remains constant. The thermometer 5 on pipe 35 monitors the temperature of the lubricating oil after cooling in real time. The operator can judge the cooling effect of the shell-and-tube cooler 3 through the temperature data and adjust the cooling medium flow in time. The liquid level indicator 6 on the oil tank 8 displays the remaining oil level intuitively, preventing cavitation or cooling interruption of the gear oil pump 2 due to insufficient oil. In addition, the drain port 12 (equipped with a shut-off valve) can completely drain the waste oil and residual impurities during system maintenance or lubricating oil replacement, ensuring the quality of the new oil and further maintaining the stability of the system circulation.

[0043] For low-temperature environments (such as winter startup or restart after long-term shutdown), the heater 9 on the oil tank 8 is electrically heated and installed at the bottom of the oil tank 8 or in the oil immersion area to evenly heat the lubricating oil to a suitable temperature (reduce viscosity and restore fluidity), ensuring that the gear oil pump 2 can draw oil normally. At the same time, it avoids the impact of low-temperature, high-viscosity oil on the filter screen of the double-barrel filter 1. The explosion-proof control cabinet 10 serves as the system control, and its cast aluminum or stainless steel shell blocks the sparks generated by the internal electrical components from contacting the oil mist near the oil tank 8, preventing safety accidents.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A novel mechanical seal cooling system for high-temperature asphalt pumps, characterized in that: include An oil tank (8) is connected to a gear oil pump (2). A filter unit is installed on the oil tank (8). The filter unit includes a double-barrel filter (1), a pipeline, and a one-way valve (11). The double-barrel filter (1) is fixed on the oil tank (8) near one end. The oil inlet end of the double-barrel filter (1) is connected to a pipeline. One end of the pipeline is connected to the gear oil pump (2). The one-way valve (11) is located at the connection between the gear oil pump (2) and the pipeline. A cooling unit is provided on the oil tank (8) to cool the lubricating oil flowing out of the double-barrel filter (1). The cooling unit includes a tubular cooler (3), two sets of support parts and a third pipe (35). The support parts include a pipe support (31) and a retaining ring (32). The tubular cooler (3) is fixed to the oil tank (8) by the two sets of support parts. The oil outlet of the double barrel filter (1) is connected to a second pipe (101). One end of the second pipe (101) is connected to the tubular cooler (3). The tubular cooler (3) is connected to the third pipe (35). One end of the third pipe (35) has an oil outlet (36). The oil outlet (36) is connected to the mechanical seal cooling chamber. The oil tank (8) is equipped with a differential pressure regulating valve (4), which is connected to the second pipeline (101) through a pipeline to monitor the pressure change of the oil in the second pipeline (101) in real time.

2. The novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 1, characterized in that: The tubular cooler (3) has an outlet (33) and an inlet (34) connected side by side to achieve the circulation of the cooling medium.

3. The novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 1, characterized in that: A vertically installed thermometer (5) is connected to the pipeline three (35) near the oil outlet (36). The thermometer (5) is used to detect the real-time temperature of the lubricating oil that is about to be delivered to the mechanical seal cooling chamber.

4. The novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 1, characterized in that: The oil tank (8) is connected to an oil return port (81), which is used to guide the lubricating oil back to the oil tank (8) to form a closed loop circulation.

5. A novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 4, characterized in that: The oil tank (8) is equipped with a liquid level indicator (6), which is used to display the liquid level height of the lubricating oil inside the oil tank (8) in real time.

6. The novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 5, characterized in that: One end of the pipeline has an oil drain port (12), which is used to completely drain the waste lubricating oil or residual oil from the oil tank (8), pipeline and related components.

7. A novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 6, characterized in that: The oil tank (8) is equipped with a heater (9), which is used to heat the lubricating oil in the oil tank (8) in a low-temperature environment.

8. A novel mechanical seal cooling system for high-temperature asphalt pumps according to claim 7, characterized in that: An explosion-proof control cabinet (10) is fixed on the oil tank (8). The explosion-proof control cabinet (10) is used for centralized control of electrical components in the cooling system.

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