Circulating pump set
By designing a multi-section flow path and buffer structure in the circulation pump group, the equipment stress problem caused by thermal expansion is solved, and a backup circulation path is provided to ensure the safe and stable operation of the high-temperature fluid system.
Patent Information
- Application Number
- CN202411568381.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-01-07
AI Technical Summary
In the secondary circulation system of high-temperature fluids, thermal expansion leads to increased mechanical stress of the equipment, which may lead to material fatigue and leakage risks. The circulation path of traditional systems is single and cannot be switched immediately in the event of a failure, affecting the normal operation of the boiler.
A circulation pump group was designed to alleviate the pressure changes caused by thermal expansion through multiple flow paths (vertical and horizontal flow sections), absorb the thermal expansion stress using buffer pipes and elastic columns, and provide a backup circulation path through three-way valves to ensure the system Stable operation.
Effectively disperse thermal expansion stress, reduce the risk of pipeline rupture, ensure the safe operation of the system, and provide backup paths in the event of failure, reduce downtime and repair time, and improve system reliability and efficiency.
Smart Images
Figure CN119267320A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of circulating pumps, and in particular to a circulating pump group. Background Art
[0002] Thermal expansion is a common phenomenon in secondary circulation systems involving high-temperature fluids such as hot oil. When a fluid is heated, its volume increases, which can cause pressure to rise inside pipes, pumps, and other related equipment. If this thermal expansion is not properly handled, it may have a series of negative effects. Thermal expansion causes additional mechanical stress on pipes and containers, which may cause material fatigue or even rupture over a long period of time. Due to the effect of thermal expansion and contraction, joints (such as flange joints) may become loose or damaged, increasing the risk of leakage. Thermal expansion may also affect the performance of pumps and valves, especially those products that are not designed to fully consider temperature changes. For example, seals may fail due to excessive stretching. As the pressure in the system changes irregularly, the operating efficiency of the entire circulation system may be affected, especially when a stable flow rate needs to be maintained. If the pressure in the system exceeds the safety valve setting value and fails to be released in time, safety accidents such as explosions may occur. In addition, the circulation path of the traditional system is relatively single. If a part of the path fails, there is no backup path to switch immediately. The entire system may need to be shut down for maintenance, affecting the normal operation of the boiler. Summary of the invention
[0003] The present invention proposes a circulation pump group, which solves the equipment safety problem caused by the thermal expansion of the fluid itself in the circulation system of the secondary circulation pump group in the related technology and the relatively single circulation path of the traditional system. If a part of the path fails, there is no backup path to switch immediately, and the entire system may need to be shut down for maintenance, affecting the normal operation of the boiler.
[0004] The technical solution of the present invention is as follows: A circulating pump set, which uses a pump body as a power source to circulate oil, comprises: an outflow pipe, one end of which is connected to the oil outlet of the pump body, and has a first flow section, a second flow section, a third flow section and a fourth flow section which are interconnected; Among them, the first flow section is connected to the pump body and is arranged vertically, the second flow section is connected to the upper end of the first flow section and is arranged horizontally, the third flow section is arranged vertically, and its upper end is connected to the second flow section, the fourth flow section is connected to the lower end of the third flow section, and the fourth flow section is arranged horizontally.
[0005] Optionally, it also includes: A buffer pipe is connected to the outflow pipe, and the buffer pipe has at least one ascending section and a descending section, wherein one of the ascending sections is connected to the fourth flow section.
[0006] Optionally, the connection between the first flow section and the second flow section, the connection between the second flow section and the third flow section, and the connection between the third flow section and the fourth flow section are all curved transitions; The connection between the ascending section and the descending section is a curved transition.
[0007] Optionally, the ratio of the height of the rising section to the height of the third flow section is ≥2.
[0008] Optionally, it also includes: A first base, wherein the first base is fixedly arranged; Elastic columns, the elastic columns are in plurality, and an array of the plurality of elastic columns is arranged on the upper end surface of the first base; The second base is arranged on a plurality of the elastic columns, and the pump body is arranged on the second base.
[0009] Optionally, it also includes: An oil return pipeline, wherein the oil return pipeline has a first oil return section and a second oil return section, the first oil return section and the second oil return section are both arranged horizontally, the second oil return section is configured as a U-shape, one end of the second oil return section is connected to the first oil return section, and the other end is connected to the oil inlet of the pump body.
[0010] Optionally, the second oil return section has two curved sections and one straight section, and further includes: A sewage pipe is arranged on the straight line segment.
[0011] Optionally, it also includes: An oil inlet pipe and an oil outlet pipe, both of which are vertical and arranged at intervals, one end of the oil inlet pipe is used to communicate with the oil outlet of the boiler, and the other end is connected to the first oil return section, one end of the oil outlet pipe is used to communicate with the oil inlet of the boiler, and the other end is connected to the first oil return section, and the distance from the connection between the oil inlet pipe and the first oil return section to the second oil return section is smaller than the distance from the connection between the oil outlet pipe and the first oil return section to the second oil return section.
[0012] Optionally, the oil outlet pipe is a split structure, having a first pipeline and a second pipeline, the first pipeline is used to communicate with the oil inlet of the boiler, the second pipeline is communicated with the first oil return section, the oil inlet pipe is communicated with the first pipeline and / or the second pipeline, and further comprises: A three-way valve, wherein the first pipeline, the second pipeline and the oil inlet pipe are connected to each other through the three-way valve.
[0013] Optionally, the oil inlet pipe has an oil inlet portion, which is located in the first oil return section and is arranged inclined. The oil inlet portion is configured so that the flow direction of the oil in the oil inlet portion is the same as the flow direction of the oil in the first oil return section. The oil outlet pipe has an oil outlet portion, which is located in the first oil return section and is also arranged inclined. The inclination direction of the oil outlet portion is opposite to that of the oil inlet portion. The oil outlet portion is configured so that part of the oil in the first oil return section flows into the oil outlet pipe through the oil outlet portion.
[0014] The working principle and beneficial effects of the present invention are: In the present invention, when the hot oil is discharged from the pump body and flows upward, any gas dissolved in the oil or steam generated by heating will be more easily separated from the oil. This is because gas is lighter than liquid and tends to move upward. In the vertical ascending flow channel, the separation efficiency of gas and steam can be significantly improved. For example, if the oil contains about 1% air by volume, this ratio can be reduced to less than 0.1% after passing through a suitable length of vertical ascending pipeline. Setting the first pipeline to go upward can reduce the risk of cavitation at the pump inlet. When the pump body sucks oil, the upward flow can help maintain sufficient net positive suction pressure head and reduce the possibility of oil boiling and forming bubbles near the pump impeller. Horizontally arranged pipelines help maintain a more stable flow rate and pressure. Since gravity has less effect on the flow in the horizontal direction, the flow of oil in the horizontal pipeline is more uniform and smooth, reducing the natural convection effect caused by gravity, making it easier for the oil in the horizontal pipeline to achieve uniform temperature distribution, and it is easier to install expansion joints or other types of compensators in the horizontal pipeline to absorb thermal expansion. These devices can effectively alleviate the mechanical stress caused by temperature changes. The vertical downward flow reduces the increase in static pressure caused by thermal expansion. Then, the oil passes through the second flow section and enters the vertically arranged third flow section. In horizontal pipes, thermal expansion will cause internal pressure to rise; while in vertical pipes, thermal expansion mainly manifests as changes in the height direction, which can be absorbed by appropriate pipe elasticity. After the third flow section (vertically downward), the oil enters the horizontally arranged fourth flow section. This arrangement allows the oil to be further mixed, thereby achieving a more uniform temperature distribution.
[0015] In summary, after passing through the pump body, the hot oil first rises vertically. At this time, the volume increase caused by thermal expansion is mainly converted into upward pressure. When the oil flow changes from vertical to horizontal, the impact of thermal expansion in the horizontal direction is relatively small, which can effectively alleviate the sharp increase in pressure caused by thermal expansion. Then the oil flow drops vertically again. This process can use gravity to further buffer the pressure changes caused by thermal expansion, making the pressure in the system more stable. Finally, the horizontal flow section provides a relatively stable output end for the entire system, reducing the impact of pressure fluctuations caused by thermal expansion on subsequent equipment.
[0016] This path design disperses the stress caused by thermal expansion. In different flow sections, the direction and stress state of the oil flow are different. The vertical section mainly bears the upward or downward pressure caused by thermal expansion, while the horizontal section mainly bears the lateral force. Through this multi-section design, the stress caused by thermal expansion will not be concentrated in a certain part, thereby reducing the risk of pipeline rupture due to thermal expansion.
[0017] The design of the entire flow path provides a certain buffer space for thermal expansion. From the vertically arranged first flow section to the horizontally arranged second flow section, and then to the vertically arranged third flow section and the horizontally arranged fourth flow section, the changes in oil flow in different directions and heights allow more space for thermal expansion to be released. When the hot oil rises in the vertical section, the increased volume can diffuse upwards; when flowing in the horizontal section, the thermal expansion can have a certain extension space in the horizontal direction. This can reduce the direct pressure of thermal expansion on the pipeline and protect the safe operation of the pump system. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.
[0019] Figure 1 This is a schematic diagram of the structure of the pump unit of the present invention from the first perspective (without buffer pipeline); Figure 2 This is a schematic diagram of the structure of the pump unit of the present invention from a second viewing angle (with a buffer pipeline installed); Figure 3 This is a schematic structural diagram of the pump unit of the present invention from a third viewing angle; Figure 4 This is a schematic structural diagram of the pump unit of the present invention from a fourth viewing angle; Figure 5 for Figure 4 AA cross-sectional structural diagram; Figure 6 Schematic diagram of the oil flow direction of the oil inlet pipe, oil outlet pipe and three-way valve.
[0020] In the figure: 1. pump body; 2. outflow pipe; 201. first circulation section; 202. second circulation section; 203. third circulation section; 204. fourth circulation section; 3. buffer pipe; 301. ascending section; 302. descending section; 4. expansion bend; 5. first base; 6. elastic column; 7. second base; 8. oil return pipe; 801. first oil return section; 802. second oil return section; 803. curved section; 804. straight section; 9. drain pipe; 10. oil inlet pipe; 1001. oil inlet part; 11. oil outlet pipe; 1101. first pipeline; 1102. second pipeline; 1103. oil outlet part; 12. three-way valve. DETAILED DESCRIPTION
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0022] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".
[0023] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0025] Reference Figure 1 to Figure 6A circulation pump group is proposed, which uses a pump body 1 as a power source to circulate oil, including: an outflow pipe 2, one end of which is connected to the oil outlet of the pump body 1, and has a first flow section 201, a second flow section 202, a third flow section 203 and a fourth flow section 204 that are interconnected; wherein the first flow section 201 is connected to the pump body 1 and is vertically arranged, the second flow section 202 is connected to the upper end of the first flow section 201 and is horizontally arranged, the third flow section 203 is vertically arranged, and its upper end is connected to the second flow section 202, the fourth flow section 204 is connected to the lower end of the third flow section 203, and the fourth flow section 204 is horizontally arranged.
[0026] In this embodiment, when the hot oil is discharged from the pump body 1 and flows upward, the gas dissolved in the oil or the steam generated by heating will be more easily separated from the oil. This is because the gas is lighter than the liquid and tends to move upward. In the vertical ascending flow channel, the separation efficiency of gas and steam can be significantly improved. Setting the first pipeline 1101 to go upward can reduce the risk of cavitation at the pump inlet. When the pump body 1 sucks the oil, the upward flow can help maintain a sufficient net positive suction pressure head and reduce the possibility of the oil boiling and forming bubbles near the pump impeller. The horizontally arranged pipeline helps to maintain a more stable flow rate and pressure. Since gravity has less effect on the flow in the horizontal direction, the flow of oil in the horizontal pipeline is more uniform and smooth, reducing the natural convection effect caused by gravity, making it easier for the oil in the horizontal pipeline to achieve a uniform temperature distribution, and the horizontal pipeline is easier to install expansion joints or other types of compensators to absorb thermal expansion. These devices can effectively alleviate the mechanical stress caused by temperature changes, and the vertical downward flow reduces the increase in static pressure caused by thermal expansion. Next, the oil passes through the second flow section 202 and enters the vertically arranged third flow section 203. In a horizontal pipe, thermal expansion will cause the internal pressure to rise; while in a vertical pipe, thermal expansion mainly manifests as a change in the height direction, which can be absorbed by appropriate pipe elasticity. After the third flow section 203 (vertically downward), the oil enters the horizontally arranged fourth flow section 204. This arrangement allows the oil to be further mixed, thereby achieving a more uniform temperature distribution.
[0027] In summary, after passing through the pump body 1, the hot oil first rises vertically. At this time, the volume increase caused by thermal expansion is mainly converted into upward pressure. When the oil flow changes from vertical to horizontal flow, the impact of thermal expansion in the horizontal direction is relatively small, which can effectively alleviate the sharp increase in pressure caused by thermal expansion. Then the oil flow drops vertically again. This process can use gravity to further buffer the pressure changes caused by thermal expansion, making the pressure in the system more stable. Finally, the horizontal flow section provides a relatively stable output end for the entire system, reducing the impact of pressure fluctuations caused by thermal expansion on subsequent equipment.
[0028] This path design disperses the stress caused by thermal expansion. In different flow sections, the direction and stress state of the oil flow are different. The vertical section mainly bears the upward or downward pressure caused by thermal expansion, while the horizontal section mainly bears the lateral force. Through this multi-section design, the stress caused by thermal expansion will not be concentrated in a certain part, thereby reducing the risk of pipeline rupture due to thermal expansion.
[0029] The design of the entire flow path provides a certain buffer space for thermal expansion. From the vertically arranged first flow section 201 to the horizontally arranged second flow section 202, and then to the vertically arranged third flow section 203 and the horizontally arranged fourth flow section 204, the changes in oil flow in different directions and heights allow more space for thermal expansion to be released. When the hot oil rises in the vertical section, the increased volume can partially diffuse upward; when flowing in the horizontal section, the thermal expansion can have a certain extension space in the horizontal direction. This can reduce the direct pressure of thermal expansion on the pipeline and protect the safe operation of the pump system.
[0030] Furthermore, it also includes: a buffer pipeline 3 , the buffer pipeline 3 is connected to the outflow pipeline 2 , the buffer pipeline 3 has at least one ascending section 301 and a descending section 302 , and one ascending section 301 is connected to the fourth flow section 204 .
[0031] In this embodiment, when the oil enters the ascending section 301 of the buffer pipe 3 from the fourth flow section 204 of the outflow pipe 2, the volume increase caused by thermal expansion is first released to a certain extent in the vertical direction. Due to the existence of the ascending section 301, a vertical buffer zone is provided for the thermal expansion of the hot oil, so that part of the thermal expansion pressure is converted into an upward force. Then it enters the descending section 302. In this process, the hot oil flows under the action of gravity, and the pressure caused by thermal expansion is further relieved. Compared with a single horizontal pipeline, this design of first ascending and then descending greatly increases the buffer space of the system for thermal expansion, thereby effectively reducing the pressure caused by thermal expansion in the horizontal direction. Thermal expansion will generate stress in the pipeline, and this structure of first ascending and then descending can disperse the stress in different directions. In the ascending section 301, the thermal expansion stress is mainly manifested as an upward thrust; in the descending section 302, the stress is mainly combined with gravity and flow resistance. By dispersing the thermal expansion stress in different directions, the concentration of stress in the horizontal direction is avoided, thereby weakening the influence of thermal expansion in the horizontal direction. For example, when thermal expansion occurs, the pipes in the ascending section 301 and the descending section 302 will bear forces in different directions respectively, instead of concentrating all stresses in the horizontal direction, reducing the risk of pipe rupture or deformation due to thermal expansion. The design of ascending first and descending later is also conducive to promoting heat exchange and heat dissipation, thereby indirectly weakening thermal expansion in the horizontal direction. In the ascending section 301, the temperature difference between the hot oil and the surrounding environment may cause a certain amount of heat exchange, and part of the heat will be dissipated into the surrounding environment. In the descending section 302, due to the effect of gravity, the oil flow rate may be accelerated, further enhancing the heat exchange with the surrounding environment. Through heat exchange and heat dissipation, the temperature of the hot oil will be reduced, and the degree of thermal expansion will be reduced accordingly, thereby alleviating the thermal expansion pressure in the horizontal direction to a certain extent.
[0032] Furthermore, the connection between the first flow section 201 and the second flow section 202, the connection between the second flow section 202 and the third flow section 203, and the connection between the third flow section 203 and the fourth flow section 204 are all curved transitions to form an expansion bend 4; the connection between the ascending section 301 and the descending section 302 is a curved transition to form an expansion bend 4.
[0033] In this embodiment, a curved transition is provided at the connection of each flow section and at the connection of the ascending section 301 and the descending section 302 of the buffer pipe 3 to form an expansion bend 4, which can effectively avoid the pipeline from turning at a right angle or an acute angle at the connection. In this way, when thermal expansion occurs, the concentration of stress at the connection can be reduced. Thermal expansion will increase the pressure and stress in the pipeline. If the connection is a sharp shape such as a right angle, the stress will be highly concentrated at these parts, which can easily cause the pipeline to rupture or damage. The design of the expansion bend 4 makes the transition of the pipeline smoother, and the stress can be distributed more evenly on the pipeline, greatly improving the stability and safety of the pipeline system. The expansion bend 4 can better adapt to the pipeline deformation caused by thermal expansion. When hot oil flows through the pipeline, the temperature rise will cause the pipeline to expand. The expansion bend 4 of the curved transition can absorb this expansion deformation to a certain extent, allowing the pipeline to have a certain expansion space under the action of thermal expansion without generating excessive stress due to rigid constraints. For example, when the pipeline is thermally expanded, the expansion bend 4 can undergo a certain deformation through its own curved shape, thereby alleviating the pressure caused by thermal expansion and reducing damage to the overall structure of the pipeline. The design of the curved transition can also reduce the flow resistance of the oil in the pipeline. Compared with a right-angle connection, the expansion bend 4 enables the oil to flow through the connection more smoothly, reducing the local resistance and turbulence caused by the sudden change in flow direction. This helps to improve the circulation efficiency of the oil and reduce the energy consumption of the pump body 1. At the same time, the smooth flow can also reduce the pressure loss of the oil in the pipeline and ensure the stable operation of the entire oil circulation system. In summary, the setting of the expansion bend 4 improves the reliability of the entire oil circulation pump group. By reducing stress concentration, adapting to thermal expansion deformation and reducing flow resistance, the expansion bend 4 effectively protects the pipeline system, extends the service life of the pipeline and reduces the maintenance cost of the system. At the same time, a reliable pipeline system also helps to ensure the stable circulation of the oil and improve the safety and efficiency of the production process.
[0034] Furthermore, the ratio of the height of the ascending section 301 and the descending section 302 to the height of the third flow section 203 is ≥2.
[0035] In this embodiment, when the ratio of the height of the ascending section 301 to the descending section 302 and the height of the third flow section 203 is ≥2, it means that the ascending section 301 and the descending section 302 of the buffer pipe 3 have a large height difference. This provides sufficient vertical buffer space for thermal expansion. During the thermal expansion process, the pressure generated by the increase in the volume of the hot oil can be more effectively released and dispersed in the ascending section 301 and the descending section 302. Whether it is the process of the hot oil rising or falling, it can fully accommodate the volume change caused by thermal expansion, greatly reducing the pressure fluctuation caused by thermal expansion in the system, and improving the stability of the system. The large height difference significantly increases the contact area between the ascending section 301 and the descending section 302 and the surrounding environment. In the process of the hot oil flowing through the ascending section 301 and the descending section 302, it can have a more sufficient heat exchange with the surrounding environment. This efficient heat exchange can reduce the temperature of the hot oil more quickly, thereby effectively suppressing the degree of thermal expansion. Good heat exchange efficiency helps to maintain the temperature of the system within a relatively stable range, further improving the operating efficiency and reliability of the entire oil circulation pump group. The high ratio design enables the riser 301 and the descender 302 to better disperse the stress generated by thermal expansion. Thermal expansion will generate stress in different directions in the pipeline, and the height advantage of the riser 301 and the descender 302 can disperse these stresses to a larger spatial range. It avoids the concentration of stress in a specific area and reduces the safety risks such as pipeline deformation and rupture. Whether in normal operation or in the case of more intense thermal expansion, this design can provide stronger protection for the system and ensure the safe and stable circulation of oil. The larger height of the riser 301 and the descender 302 provides convenient conditions for the maintenance and adjustment of the system. When performing operations such as system maintenance, equipment replacement or pipeline cleaning, the staff can more conveniently operate in these areas with large height differences. At the same time, the high ratio design also reserves enough space for future system upgrades and expansions, making the system more scalable and adaptable.
[0036] Furthermore, it also includes: a first base 5, which is fixed; a plurality of elastic columns 6, which are arranged in an array on the upper end surface of the first base 5; a second base 7, which is arranged on the plurality of elastic columns 6, and the pump body 1 is arranged on the second base 7.
[0037] In this embodiment, by arranging the elastic column 6 between the first base 5 and the second base 7, the vibration generated when the pump body 1 is working can be effectively absorbed. When the pump body 1 is running, the vibration will be transmitted to the pipeline system connected thereto. If there is no shock absorption measure, this vibration may cause problems such as loosening of the pipeline connection and cracking of the weld, seriously affecting the sealing and stability of the pipeline. The shock absorbing effect of the elastic column 6 can greatly reduce the transmission of vibration to the pipeline, protect the integrity of the pipeline system, and reduce the risk of pipeline leakage. For the pump body 1 itself, continuous vibration will accelerate the wear and fatigue damage of its internal parts. After the elastic column 6 is arranged, the vibration impact on the pump body 1 can be significantly reduced, and the friction and collision between the components can be reduced. This helps to extend the service life of the pump body 1 and reduce the maintenance cost. At the same time, a stable operating environment can also improve the working efficiency and performance of the pump body 1. The vibration generated when the pump body 1 is working is usually accompanied by the generation of noise. The shock absorbing effect of the elastic column 6 can reduce the transmission of vibration, thereby reducing the intensity of noise. This is of positive significance for improving the working environment and reducing noise pollution. Stable operation of the pump body 1 is crucial to the stability of the entire oil circulation system. The elastic column 6 can ensure that the pump body 1 maintains a relatively stable position during operation, reducing displacement and shaking caused by vibration, which helps to maintain the firmness of the pipeline connection and the stability of the oil flow, and improves the reliability and safety of the system.
[0038] Furthermore, it also includes: an oil return pipeline 8, the oil return pipeline 8 has a first oil return section 801 and a second oil return section 802, the first oil return section 801 and the second oil return section 802 are both arranged horizontally, the second oil return section 802 is configured as a U-shape, one end of the second oil return section 802 is connected to the first oil return section 801, and the other end is connected to the oil inlet of the pump body 1.
[0039] In this embodiment, a horizontally arranged first oil return section 801 is provided so that the oil passing through the flat press equipment can enter the oil return pipe 8 in a relatively stable state at the initial stage of return. Horizontal flow helps to reduce turbulence and fluctuations in the oil, thereby making the return oil pressure relatively stable. The U-shaped second oil return section 802 plays a certain buffering role. When the oil enters the U-shaped section, its flow rate will be reduced, further stabilizing the return oil pressure. Stable return oil pressure is crucial for the normal operation of the pump body 1, which can avoid damage to the pump body 1 due to excessive pressure fluctuations and improve the reliability of the system. The low point position of the U-shaped section can make a small amount of gas that may be mixed in gather here, which is convenient for subsequent removal and processing, thereby ensuring the purity of the oil and the normal operation of the pump body 1. The design of this return oil pipe 8 enhances the adaptability of the entire oil circulation system to different working conditions. Whether the output oil volume of the flat press equipment changes greatly or pressure fluctuations occur during system operation, the first oil return section 801 and the U-shaped second oil return section 802 can effectively adjust the return oil flow and pressure to ensure that the oil can smoothly return to the oil inlet of the pump body 1. This enables the system to maintain a stable operating state under different working conditions, improving the versatility and reliability of the system. The horizontally arranged first oil return section 801 and the U-shaped second oil return section 802 with obvious shape characteristics are more convenient for maintenance and overhaul. The staff can more easily observe the flow of the oil and determine whether there are problems such as blockage and leakage. At the same time, operations such as cleaning, repairing and replacing parts of the pipeline are also more convenient, reducing maintenance costs and time.
[0040] Furthermore, the second oil return section 802 has two curved sections 803 and a straight section 804, and further includes a sewage pipe 9, which is arranged on the straight section 804. In this embodiment, when a device fails, the drain pipe 9 arranged on the straight section 804 of the second oil return section 802 can quickly discharge the oil inside the pipeline. This allows the staff to more conveniently approach the faulty part during troubleshooting and maintenance, reducing the interference of the oil on the maintenance work. Compared with setting the drain pipe 9 on the curved section 803, the straight section 804 is easier to operate and connect to the external discharge equipment, thereby improving the maintenance efficiency. The second oil return section 802 is usually at the lowest point of the entire oil return pipeline 8, where impurities and sediments in the oil tend to gather under the action of gravity. Setting the drain pipe 9 on the straight section 804 can ensure that the oil can flow out smoothly during the sewage discharge process, avoiding incomplete sewage discharge due to obstruction of the curved part. The drain pipe 9 of the straight section 804 can discharge the oil and impurities in the pipeline to the greatest extent, providing good conditions for the repair and restart of the equipment. In the event of a fault, timely discharge of the oil can reduce the pressure in the pipeline and the potential damage to the pipeline. If the oil cannot be discharged in time, it may cause problems such as pipeline rupture and loose joints. By setting the drain pipe 9 in the straight section 804, the pressure in the pipeline can be quickly reduced, the risk of pipeline damage can be reduced, and the integrity of the entire oil circulation system can be protected. This design improves the reliability and maintainability of the entire oil circulation system. In daily operation, the existence of the drain pipe 9 can be used as a preventive maintenance measure to regularly discharge impurities and sediments that may accumulate and maintain the cleanliness of the oil. When a fault occurs, the sewage discharge operation can be carried out quickly and effectively, shortening the maintenance time and reducing the loss of production interruption, thereby improving the overall stability and availability of the system. At the same time, as a preferred embodiment, relevant detection equipment such as a thermometer, an exhaust valve, a pressure gauge and a thermal resistor can be set on the second circulation section 202 to detect and monitor relevant values.
[0041] Furthermore, it also includes: an oil inlet pipe 10 and an oil outlet pipe 11, both of which are vertical and arranged at intervals, one end of the oil inlet pipe 10 is used to communicate with the oil outlet of the boiler, and the other end is connected to the first oil return section 801, one end of the oil outlet pipe 11 is used to communicate with the oil inlet of the boiler, and the other end is connected to the first oil return section 801, and the distance from the connection between the oil inlet pipe 10 and the first oil return section 801 to the second oil return section 802 is smaller than the distance from the connection between the oil outlet pipe 11 and the first oil return section 801 to the second oil return section 802.
[0042] In this embodiment, an oil inlet pipe 10 and an oil outlet pipe 11 are provided in this scheme, both of which are vertical and arranged at intervals. One end of the oil inlet pipe 10 is connected to the oil outlet of the boiler, and the other end is connected to the first oil return section 801, which is used to transport the oil heated to a specified temperature (such as about 200°C) in the boiler to the first oil return section 801, thereby entering the entire oil circulation system. One end of the oil outlet pipe 11 is connected to the oil inlet of the boiler, and the other end is connected to the first oil return section 801. When the oil is affected by the normal temperature environment during the circulation process and the temperature gradually decreases, and is lower than the standard range (for example, the standard range is 180-200°C, when the temperature is lower than 180°C), the low-temperature oil will flow into the boiler through the oil outlet pipe 11 for reheating. At the same time, the distance from the connection between the oil inlet pipe 10 and the first oil return section 801 to the second oil return section 802 is smaller than the distance from the connection between the oil outlet pipe 11 and the first oil return section 801 to the second oil return section 802. Such a position setting makes the flow path more reasonable, reduces the turbulence and resistance of the oil in the pipeline, and enables the oil to flow more smoothly. At the same time, the high-temperature oil in the oil outlet pipe 11 preferentially enters the pump body 1 through the U-shaped second oil return section 802, ensuring that the pump body 1 can first obtain the oil with a higher temperature, thereby improving the working efficiency and stability of the pump body 1, because the energy required by the pump body 1 when processing the high-temperature oil is relatively low, and it can reach the working state faster. In addition, the timely return of the low-temperature oil to the boiler for heating also avoids energy waste and improves energy utilization efficiency.
[0043] By setting the oil inlet pipe 10 and the oil outlet pipe 11, the oil temperature in the circulation pipeline can be accurately controlled. When the oil temperature is lower than the standard range, the boiler can inject high-temperature oil through the oil inlet pipe 10 in time to maintain the temperature stability of the circulation system, ensure that the oil works within the optimal temperature range, and improve the efficiency and reliability of the system. The vertical arrangement of the oil inlet pipe 10 and the oil outlet pipe 11 and the reasonable connection with the first oil return section 801 make the oil flow more smoothly during the circulation process, reduce the flow resistance, and improve the circulation efficiency. At the same time, the design of the interval arrangement also avoids mutual interference between the pipelines and ensures the stable operation of the system. This solution can effectively cope with changes in oil temperature and reduce the impact of temperature fluctuations on the system. Whether in the oil heating stage or in the circulation process, it can ensure the stable operation of the system, reduce the risk of equipment failure, and extend the service life of the equipment.
[0044] Furthermore, the oil outlet pipe 11 is a split structure, having a first pipeline 1101 and a second pipeline 1102, the first pipeline 1101 is used to connect to the oil inlet of the boiler, the second pipeline 1102 is connected to the first oil return section 801, the oil inlet pipe 10 is connected to the first pipeline 1101 and / or the second pipeline 1102, and also includes: a three-way valve 12, the first pipeline 1101, the second pipeline 1102 and the oil inlet pipe 10 are connected through the three-way valve 12. The oil inlet pipe 10 has an oil inlet portion 1001, which is located in the first oil return section 801. The oil inlet portion 1001 is an inclined opening. The oil inlet portion 1001 is configured so that the flow direction of the oil in the oil inlet portion 1001 is the same as the flow direction of the oil in the first oil return section 801. The oil outlet pipe 11 has an oil outlet portion 1103, which is located in the first oil return section 801. The oil outlet is also an inclined opening. The inclination direction of the oil outlet portion 1103 is opposite to that of the oil inlet portion 1001. The oil outlet portion 1103 is configured so that part of the oil in the first oil return section 801 flows into the oil outlet pipe 11 through the oil outlet portion 1103.
[0045] In this embodiment, the function of the three-way valve 12 is to provide a new circulation path for the boiler. In the traditional system, the boiler has its own independent primary circulation system, and a valve is provided in the circulation pipeline, and the valve is in a normally open state. In this solution, a three-way valve 12 is provided between the oil inlet pipe 10 and the oil outlet pipe 11 to form a second circulation path that can be used for the boiler. Figure 6 As shown, when port A is closed, the portion of the oil inlet pipe 10 located below the three-way valve 12 in height is filled with oil. At this time, the oil enters the three-way valve 12 through the oil inlet pipe 10 and the port B of the three-way valve 12, and flows back to the boiler through the AB port and the first pipeline 1101 in sequence. The advantage of adding a new circulation path is that in a traditional system, if a part of the primary circulation system fails, the entire system may need to be shut down for maintenance. The new circulation path can continue to maintain the normal operation of the boiler when a problem occurs in the primary circulation system, reducing downtime, and when the temperature in the secondary circulation system where the outflow pipe 2 and the return oil pipe 8 are located is lower than the set range, the oil in the secondary circulation system can be returned to the boiler through the oil outlet pipe 11 for heating by opening part of the port A and closing the port B, and the high-temperature oil enters the first return oil section 801 through the oil inlet pipe 10 to participate in the secondary circulation.
[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.
Claims
1. A circulating pump set, using a pump body (1) as a power source to circulate oil, characterized in that: include: an outflow pipe (2), one end of which is connected to the oil outlet of the pump body (1), and comprises a first flow section (201), a second flow section (202), a third flow section (203) and a fourth flow section (204) which are interconnected; The first flow section (201) is connected to the pump body (1) and is arranged vertically; the second flow section (202) is connected to the upper end of the first flow section (201) and is arranged horizontally; the third flow section (203) is arranged vertically and its upper end is connected to the second flow section (202); the fourth flow section (204) is connected to the lower end of the third flow section (203), and the fourth flow section (204) is arranged horizontally.
2. A circulating pump set according to claim 1, characterized in that: Also includes: A buffer pipe (3), the buffer pipe (3) is connected to the outflow pipe (2), the buffer pipe (3) has at least one ascending section (301) and a descending section (302), and one of the ascending sections (301) is connected to the fourth flow section (204).
3. A circulating pump set according to claim 2, characterized in that: The connection between the first circulation section (201) and the second circulation section (202), the connection between the second circulation section (202) and the third circulation section (203), and the connection between the third circulation section (203) and the fourth circulation section (204) are all curved transitions; The connection between the ascending section (301) and the descending section (302) is a curved transition.
4. A circulating pump set according to claim 2, characterized in that: The ratio of the height of the rising section (301) to the height of the third flow section (203) is ≥2.
5. A circulating pump set according to claim 1, characterized in that: Also includes: A first base (5), wherein the first base (5) is fixedly arranged; Elastic columns (6), there being a plurality of elastic columns (6), and the plurality of elastic columns (6) being arranged in an array on the upper end surface of the first base (5); A second base (7), wherein the second base (7) is arranged on a plurality of the elastic columns (6), and the pump body (1) is arranged on the second base (7).
6. A circulating pump set according to claim 1, characterized in that: Also includes: An oil return pipeline (8), the oil return pipeline (8) comprising a first oil return section (801) and a second oil return section (802), the first oil return section (801) and the second oil return section (802) being arranged horizontally, the second oil return section (802) being configured in a U shape, one end of the second oil return section (802) being connected to the first oil return section (801), and the other end being connected to the oil inlet of the pump body (1).
7. A circulation pump assembly according to claim 6, characterized in that: The second oil return section (802) has two curved sections (803) and a straight section (804), and further includes: A sewage discharge pipe (9), wherein the sewage discharge pipe (9) is arranged on the straight line segment (804).
8. A circulation pump assembly according to claim 6, characterized in that: Also includes: An oil inlet pipe (10) and an oil outlet pipe (11), wherein the oil inlet pipe (10) and the oil outlet pipe (11) are both vertical and spaced apart, one end of the oil inlet pipe (10) being used to communicate with the oil outlet of the boiler, and the other end being used to communicate with the first oil return section (801), one end of the oil outlet pipe (11) being used to communicate with the oil inlet of the boiler, and the other end being used to communicate with the first oil return section (801), and the distance from the connection point between the oil inlet pipe (10) and the first oil return section (801) to the second oil return section (802) being shorter than the distance from the connection point between the oil outlet pipe (11) and the first oil return section (801) to the second oil return section (802).
9. A circulation pump assembly according to claim 8, characterized in that: The oil outlet pipe (11) is a split structure, comprising a first pipeline (1101) and a second pipeline (1102), wherein the first pipeline (1101) is used to communicate with the oil inlet of the boiler, and the second pipeline (1102) is communicated with the first oil return section (801), and the oil inlet pipe (10) is communicated with the first pipeline (1101) and / or the second pipeline (1102), and further comprising: A three-way valve (12), wherein the first pipeline (1101), the second pipeline (1102) and the oil inlet pipe (10) are connected to each other via the three-way valve (12).
10. A circulation pump assembly according to claim 8, characterized in that: The oil inlet pipe (10) comprises an oil inlet portion (1001), the oil inlet portion (1001) is located in the first oil return section (801), the oil inlet portion (1001) is arranged obliquely, and the oil inlet portion (1001) is configured such that the flow direction of the oil in the oil inlet portion (1001) is the same as the flow direction of the oil in the first oil return section (801). The oil outlet pipe (11) comprises an oil outlet portion (1103), the oil outlet portion (1103) is located in the first oil return section (801), the oil outlet portion (1103) is also arranged obliquely, the inclination direction of the oil outlet portion (1103) is opposite to the inclination direction of the oil inlet portion (1001), and the oil outlet portion (1103) is configured such that part of the oil in the first oil return section (801) flows into the oil outlet pipe (11) through the oil outlet portion (1103).