CN112682358B - Safe and stable high-temperature-resistant hot water circulating pump system - Google Patents
Safe and stable high-temperature-resistant hot water circulating pump system Download PDFInfo
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Abstract
The invention discloses a safe and stable high-temperature-resistant hot water circulating pump system, which comprises a hot water circulating pump, a mechanical seal, a pressure control valve (9), a micro turbine (10), a threaded pump (11), a heat exchanger (14) and a jet device (16), and is characterized in that: the outlet part of the hot water circulating pump is connected with the threaded pump through a first pipeline, the threaded pump is connected with the heat exchanger through a pipeline, the heat exchanger is connected with the jet device through a pipeline, a driving shaft of the threaded pump is connected with the miniature steam turbine, the miniature steam turbine is connected with the first pipeline through a pipeline, a pressure control valve is connected between the miniature steam turbine and the first pipeline, the miniature steam turbine is connected with the jet device through a pipeline, and the jet device is connected with a mechanical seal through a second pipeline. When the machine is stopped and standby, the cooling water of the machine seal is still circulated, so that the machine seal is not damaged at the allowable working temperature; in addition, the pressure stability at the outlet of the impeller can be improved, thereby improving the output pressure stability of the hot water circulating pump.
Description
Technical Field
The invention relates to the technical field of hot water circulating pump systems, in particular to a safe and stable high-temperature-resistant hot water circulating pump system.
Background
When the mechanical seal of the hot water circulating pump in the prior art is designed, only the cooling of the mechanical seal cavity is considered during operation, when the machine is stopped and is in a standby state, the mechanical seal circulating cooling water system stops working, the medium temperature of the mechanical seal cavity is the same as that of the centrifugal pump group, and when the medium temperature is more than or equal to 220 ℃, the mechanical seal is easily damaged.
The existing hot water circulating pump can monitor the temperature of the mechanical seal cavity and perform early warning when being applied, and whether the mechanical seal is leaked is monitored by reasonable detection measures so as to avoid accidents such as casualties, production line production stoppage and the like easily caused when the problem is solved. In the prior art, the real-time operation condition of the hot water circulating pump system is monitored in real time through tools such as remote network control, APP or Internet of things, for example, the operation conditions comprise monitoring flow, pressure, temperature, machine seal working state, pump bearing box temperature, vibration and the like, and the operation parameters of the hot water circulating pump/centrifugal pump are monitored, alarmed and processed.
In addition, when the existing hot water circulating pump supplies, certain pressure fluctuation exists, so that the pressure of the hot water circulating pump is unstable, and the use effect of a use terminal is influenced.
In view of the above circumstances and requirements, the present invention provides a safe and stable high temperature resistant hot water circulating pump system to solve the above technical problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a safe and stable high-temperature-resistant hot water circulating pump system, which is mainly characterized in that when the system is stopped and standby, cooling water of a machine seal is still circulated, the machine seal is ensured not to be damaged at an allowable working temperature, and meanwhile, the running conditions of the pump and the machine seal and the leakage condition of the machine seal can be monitored in real time when hot water medium with the temperature of more than or equal to 200 ℃ is conveyed. In addition, the invention can reduce the pressure fluctuation at the outlet of the centrifugal pump impeller through the structural design of the impeller, thereby improving the pressure stability at the outlet of the impeller and improving the output pressure stability of the hot water circulating pump.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a safe and stable form high temperature resistant hot water circulating pump system, its includes hot water circulating pump (1), mechanical seal, pressure control valve (9), miniature steam turbine (10), screw pump (11), heat exchanger (14), fluidic device (16), its characterized in that: the outlet part of the hot water circulating pump is connected with the threaded pump through a first pipeline (A), the threaded pump is connected with the heat exchanger through a pipeline, the heat exchanger is connected with the jet device through a pipeline, the driving shaft of the threaded pump is connected with the miniature steam turbine, the miniature steam turbine is connected with the first pipeline through a pipeline, a pressure control valve is connected between the miniature steam turbine and the first pipeline, the miniature steam turbine is connected with the jet device through a pipeline, and the jet device is connected with a mechanical seal through a second pipeline (B).
Furthermore, the hot water circulating pump is a centrifugal pump and is provided with a suction pipe (2), a temperature sensor and a pressure sensor are arranged on the suction pipe, a pressure sensor and an outlet middle pipe (6) are connected to an outlet part of the hot water circulating pump, and the outlet middle pipe is connected with an outlet connecting pipe (8) through a flowmeter (7).
Furthermore, a pressure sensor and a temperature sensor are arranged/connected on a pipeline between the screw pump and the heat exchanger, a temperature sensor is connected on a cooling water outlet of the heat exchanger, a temperature sensor is connected on a cooling water inlet of the heat exchanger, a thermometer is connected on a pipeline between the heat exchanger and the jet device, and a pressure sensor is connected on a second pipeline.
Furthermore, a temperature sensor is connected to the mechanical seal, a liquid storage tank (26) is arranged below the mechanical seal, a liquid level sensor (25) is arranged in the liquid storage tank, the hot water circulating pump is connected with the motor through a bearing box and a coupler, and one or more vibration-temperature integrated sensors are arranged on the bearing box; the data acquisition and transmission DTU is provided with a wireless control end.
Further, the hot water circulating pump is the centrifugal pump, and the centrifugal pump includes the spiral case, the impeller, and the impeller includes front bezel (101), back plate (102), blade (103), and a plurality of blades are evenly connected between front bezel and back plate along circumference, and the blade has leading edge (104), and the leading edge is including the first arc convex part (105), second arc convex part (106) that connect gradually, and the protruding direction of first arc convex part is the radial inboard towards the impeller, and the protruding direction of second arc convex part is the radial outside towards the impeller, and the protruding direction of first arc convex part is opposite with the protruding direction of second arc convex part.
Furthermore, the blade type fan also comprises a shunting ring (107), wherein the shunting ring is connected with each blade, a connecting groove part is arranged on each blade, and the shunting ring is combined in the connecting groove part; the splitter ring is arranged parallel to the back plate.
Further, the upstream end of the diverting ring (107) is provided with a flow guide part (108), and the flow guide part is a generally circular or oval flow guide part.
Further, the first arced convex portion has a maximum first curvature (110) and the second arced convex portion has a maximum second curvature (111), the maximum first curvature being equal to 2.5-5 times the maximum second curvature.
Further, the joint of the first arc-shaped convex part and the second arc-shaped convex part is provided with a separation point (109), and the position of the separation point in the axial direction is substantially equal to the position of the diverter ring; the diverter ring has a radial length R2, the impeller has a radius R1, and R1 is (2-5) R2.
Further, the micro turbine (10) is used for driving the operation of the screw pump, and the pressure control valve (9) is used for controlling the rotation or stop of the micro turbine.
The invention relates to a self-circulation process of a mechanical seal cavity medium under the shutdown working condition, which comprises the following steps:
in order to change the condition, the invention designs a medium self-circulation system under the shutdown condition, which mainly comprises a pressure control valve, a micro steam turbine, a threaded pump and a jet device. When the hot water circulating pump is in a shutdown/standby state, high-pressure water medium in the pump cavity of the centrifugal pump is released through pressure to generate steam, the miniature steam turbine is pushed to drive the screw pump to operate, so that the medium circulates, and the medium in the mechanical seal cavity is ensured to be within an allowable working temperature range after being cooled by the heat exchanger. When the hot water circulating pump is switched to a working state, the pressure control valve is closed, the micro turbine stops working, the threaded pump is only a fluid channel at the moment, and high-temperature and high-pressure liquid passes through the threaded pump, directly enters the heat exchanger and then enters the mechanical seal cavity.
The safe and stable high-temperature-resistant hot water circulating pump system is mainly characterized in that when the system is stopped and standby, machine seal cooling water is still circulated, the machine seal is guaranteed not to be damaged at an allowable working temperature, and meanwhile, the running conditions of the pump and the machine seal and the leakage condition of the machine seal can be monitored in real time when hot water medium with the temperature of more than or equal to 200 ℃ is conveyed. In addition, the invention can reduce the pressure fluctuation at the outlet of the centrifugal pump impeller through the structural design of the impeller, thereby improving the pressure stability at the outlet of the impeller and improving the output pressure stability of the hot water circulating pump.
Drawings
FIG. 1 is a schematic structural diagram of a safe and stable high-temperature resistant hot water circulating pump system according to the present invention;
FIG. 2 is a schematic structural view of a hot water circulation pump/centrifugal pump impeller of the present invention;
FIG. 3 is a schematic structural view of a hot water circulation pump/centrifugal pump impeller of the present invention;
fig. 4 is a control schematic diagram of the safe and stable high-temperature resistant hot water circulating pump system according to the present invention.
In the figure: the system comprises a hot water circulating pump 1 (a centrifugal pump), a suction pipe 2, a temperature sensor 3, a pressure sensor 4, a pressure sensor 5, an outlet intermediate pipe 6, a flow meter 7, an outlet connecting pipe 8, a pressure control valve/regulating valve 9, a micro turbine 10, a screw pump 11, a pressure sensor 12, a temperature sensor 13, a heat exchanger 14, a thermometer 15, a fluidic device 16, a pressure sensor 17, a data acquisition and transmission DTU18, a control cabinet 19, a connecting pipeline 20, a temperature sensor 21, a temperature sensor 22, a vibration-temperature integrated sensor 23, a vibration-temperature integrated sensor 24, a liquid level sensor 25, a liquid storage tank 26 and a temperature sensor 27; the front disc 101, the rear disc 102, the blades 103, the leading edge 104, the first arced convex portion 105, the second arced convex portion 106, the diverter ring 107, the flow guide portion 108, the separation point 109, the first curvature 110, and the second curvature 111.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a safe and stable high-temperature resistant hot water circulating pump system includes a hot water circulating pump 1, a mechanical seal, a pressure control valve 9, a micro turbine 10, a screw pump 11, a heat exchanger 14, and a jet device 16, and is characterized in that: the outlet part of the hot water circulating pump 1 is connected with the threaded pump 11 through a first pipeline A, the threaded pump 11 is connected with the heat exchanger 14 through a pipeline, the heat exchanger 14 is connected with the fluidic device 16 through a pipeline, the driving shaft of the threaded pump 11 is connected with the micro turbine 10, the micro turbine 10 is connected with the first pipeline A through a pipeline, the pressure control valve 9 is connected between the micro turbine 10 and the first pipeline A, the micro turbine 10 is connected with the fluidic device 16 through a pipeline, and the fluidic device 16 is connected with a mechanical seal through a second pipeline B20.
The hot water circulating pump 1 is a centrifugal pump, the hot water circulating pump 1 is provided with a suction pipe 2, the suction pipe 2 is provided with/connected with a temperature sensor 3 and a pressure sensor 4, the outlet part of the hot water circulating pump 1 is connected with a pressure sensor 5 and an outlet intermediate pipe 6, and the outlet intermediate pipe 6 is connected with an outlet connecting pipe 8 through a flowmeter 7.
A pressure sensor 12 and a temperature sensor 22 are arranged/connected on a pipeline between the screw pump 11 and the heat exchanger 14, a temperature sensor 13 is connected on a cooling water outlet of the heat exchanger 14, a temperature sensor 21 is connected on a cooling water inlet of the heat exchanger 14, a thermometer 15 is connected on a pipeline between the heat exchanger 14 and the fluidic device 16, and a pressure sensor 17 is connected on a second pipeline B20.
The mechanical seal is connected with a temperature sensor 27, a liquid storage tank 26 is arranged below the mechanical seal, a liquid level sensor 25 is arranged in the liquid storage tank 26, the hot water circulating pump 1 is connected with the motor through a bearing box and a coupler, and the bearing box is provided with one or more vibration-temperature integrated sensors 23 and 24. The intelligent control system also comprises a data acquisition and transmission DTU18 and a control cabinet 19, wherein a wireless control end is arranged on the data acquisition and transmission DTU 18.
The invention relates to a self-circulation process of a mechanical seal cavity medium under the shutdown working condition, which comprises the following steps:
because the hot water circulating pump system is in the standby shutdown state, the temperature of the mechanical seal cavity is the same as the temperature in the pump cavity under the normal condition, and the normal use of the mechanical seal is influenced, in order to change the condition, the medium self-circulation system under the shutdown condition is designed, and the medium self-circulation system mainly comprises a pressure control valve 9, a micro turbine 10, a threaded pump 11 and a jet device 16. When the hot water circulating pump is in a shutdown/standby state, high-pressure water medium in a pump cavity of the centrifugal pump is released through pressure to generate steam, the miniature steam turbine 10 is pushed to drive the threaded pump 11 to operate, and therefore the medium is circulated and cooled through the heat exchanger 14, and the medium in a mechanical seal cavity is ensured to be within an allowable working temperature range. When the hot water circulating pump is switched to the working state, the pressure control valve 9 is closed, the micro turbine 10 stops working, the screw pump 11 is only a fluid channel at the moment, and high-temperature and high-pressure liquid passes through the fluid channel, directly enters the heat exchanger 14 and then enters the mechanical seal cavity.
The safe and stable high-temperature-resistant hot water circulating pump system is mainly characterized in that when the system is stopped and standby, machine seal cooling water is still circulated, the machine seal is guaranteed not to be damaged at an allowable working temperature, and meanwhile, the running conditions of the pump and the machine seal and the leakage condition of the machine seal can be monitored in real time when hot water medium with the temperature of more than or equal to 200 ℃ is conveyed.
As shown in fig. 2-3, the hot water circulation pump 1 is a centrifugal pump, the centrifugal pump includes a volute and an impeller, the impeller includes a front disc 101, a rear disc 102 and blades 103, the blades 103 are uniformly connected between the front disc 101 and the rear disc 102 along a circumferential direction, the blades 103 have a front edge 104, the front edge 104 includes a first arc-shaped protrusion 105 and a second arc-shaped protrusion 106 which are sequentially connected, a protrusion direction of the first arc-shaped protrusion 105 is toward a radial inner side of the impeller, and a protrusion direction of the second arc-shaped protrusion 106 is toward a radial outer side of the impeller, that is, the protrusion directions of the first arc-shaped protrusion 105 and the second arc-shaped protrusion 106 are opposite.
Furthermore, the blade structure also comprises a shunting ring 107, wherein the shunting ring 107 is connected with each blade 103, a connecting groove part is arranged on each blade 103, and the shunting ring 107 is combined in the connecting groove part; the diverter ring 107 is disposed parallel to the back plate 102.
Further, the upstream end of the diverter ring 107 is provided/provided with a flow guide 108, the flow guide 108 being a substantially circular or elliptical flow guide.
According to the invention, through the structural design of the impeller, the pressure fluctuation at the outlet of the impeller of the centrifugal pump can be reduced, so that the pressure stability at the outlet of the impeller is improved, and the output pressure stability of the hot water circulating pump is improved.
Further, the first arced convex portion 105 has a maximum first curvature 110 and the second arced convex portion 106 has a maximum second curvature 111, the maximum first curvature 110 being equal to 3.5-4.5 times the maximum second curvature 111, preferably 4 times.
Further, the junction of the first arc-shaped protrusion 105 and the second arc-shaped protrusion 106 has a separation point 109, and the position of the separation point 109 in the axial direction is substantially equal/identical to the position of the diverter ring 107. The diverter ring 107 has a radial length R2, the impeller has a radius R1, R1 ═ 3-4R 2, preferably 3.5. The outside diameter of the diverter ring 107 is the same as the outside diameter of the impeller.
According to the invention, through the structural design of the impeller, the pressure fluctuation at the outlet of the impeller of the centrifugal pump can be further reduced, so that the pressure stability at the outlet of the impeller is improved, and the output pressure stability of the hot water circulating pump is improved.
As shown in fig. 4, the mechanical seal working environment and the operation condition of the invention are monitored and pre-warned in real time:
1) the temperature monitoring and early warning device mainly monitors and warns the temperature of a medium in a machine seal cavity, and comprises a pressure sensor 12 and a temperature sensor 22, wherein the medium from a pump outlet enters an inlet of a heat exchanger, a medium temperature sensor 27, a cooling water inlet temperature sensor 21 and a cooling water outlet temperature sensor 13, and the medium temperature sensor 27 enters the machine seal cavity after being cooled by the heat exchanger 14.
2) Designed liquid storage tank 26, installed level sensor 27, carried out real time monitoring and early warning to mechanical seal's operation leakage condition.
3) The method comprises the steps of collecting and displaying running parameters such as flow, pressure, medium temperature, pump bearing temperature, vibration, motor current, voltage and the like of a hot water circulating pump system in real time, and monitoring and early warning the running working state of the pump.
The invention mainly carries out real-time monitoring and early warning on the inlet temperature, pressure, outlet pressure, flow, vibration of a pump bearing box, bearing temperature and motor running current during running. A real-time transmission cloud module for on-site monitoring and operating data is designed.
The invention mainly monitors the parameters:
pump operating parameters: pump suction inlet pressure, outlet pressure, medium temperature, flow, bearing temperature, bearing box vibration.
Mechanical sealing: the temperature and pressure before the heat exchanger, the temperature after heat exchange and the temperature of the mechanical seal cavity; the inlet temperature of cooling water of the heat exchanger and the outlet temperature of the cooling water of the heat exchanger; mechanical seal leakage signal.
An electric motor: current, voltage, motor three-phase winding temperature, bearing temperature, terminal temperature.
Control parameters, motor start and stop, and trend abnormity early warning and processing.
When the monitoring parameters exceed the set range and show irregular conditions, giving an alarm to prompt for processing, and when obvious faults occur, automatically stopping the machine.
The safe and stable high-temperature-resistant hot water circulating pump system is mainly characterized in that when the system is stopped and standby, machine seal cooling water is still circulated, the machine seal is guaranteed not to be damaged at an allowable working temperature, and meanwhile, the running conditions of the pump and the machine seal and the leakage condition of the machine seal can be monitored in real time when hot water medium with the temperature of more than or equal to 200 ℃ is conveyed. In addition, the invention can reduce the pressure fluctuation at the outlet of the centrifugal pump impeller through the structural design of the impeller, thereby improving the pressure stability at the outlet of the impeller and improving the output pressure stability of the hot water circulating pump.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (5)
1. The utility model provides a safe and stable form high temperature resistant hot water circulating pump system, its includes hot water circulating pump (1), mechanical seal, pressure control valve (9), miniature steam turbine (10), screw pump (11), heat exchanger (14), fluidic device (16), its characterized in that: the outlet part of the hot water circulating pump is connected with the threaded pump through a first pipeline (A), the threaded pump is connected with the heat exchanger through a pipeline, the heat exchanger is connected with the jet device through a pipeline, a driving shaft of the threaded pump is connected with the miniature steam turbine, the miniature steam turbine is connected with the first pipeline through a pipeline, a pressure control valve is connected between the miniature steam turbine and the first pipeline, the miniature steam turbine is connected with the jet device through a pipeline, and the jet device is connected with a mechanical seal through a second pipeline (B); the micro turbine (10) is used for driving the operation of the screw pump, and the pressure control valve (9) is used for controlling the rotation or stop of the micro turbine;
the hot water circulating pump is a centrifugal pump, the centrifugal pump comprises a volute and an impeller, the impeller comprises a front disc (101), a rear disc (102) and blades (103), the blades are uniformly connected between the front disc and the rear disc along the circumferential direction, each blade is provided with a front edge (104), each front edge comprises a first arc-shaped convex part (105) and a second arc-shaped convex part (106) which are sequentially connected, the convex direction of each first arc-shaped convex part is towards the radial inner side of the impeller, the convex direction of each second arc-shaped convex part is towards the radial outer side of the impeller, and the convex directions of the first arc-shaped convex parts and the second arc-shaped convex parts are opposite; the blade-mounted fan blade assembly is characterized by further comprising a shunting ring (107), wherein the shunting ring is connected with each blade, a connecting groove part is formed in each blade, and the shunting ring is combined in the connecting groove part; the flow dividing ring is arranged in parallel to the rear disc, and the upstream end of the flow dividing ring (107) is provided with a flow guide part (108) which is a generally circular or oval flow guide part; the first arc-shaped convex part has a maximum first curvature (110), the second arc-shaped convex part has a maximum second curvature (111), the maximum first curvature is equal to 2.5-5 times of the maximum second curvature, and a connecting part of the first arc-shaped convex part and the second arc-shaped convex part is provided with a separation point (109), and the position of the separation point in the axial direction is substantially the same as that of the diverter ring.
2. The system of claim 1, wherein the hot water circulating pump has a suction pipe (2), the suction pipe is provided with a temperature sensor and a pressure sensor, the outlet part of the hot water circulating pump is connected with the pressure sensor and an outlet intermediate pipe (6), and the outlet intermediate pipe is connected with the outlet connecting pipe (8) through a flow meter (7).
3. The system of claim 2, wherein a pressure sensor and a temperature sensor are disposed on the pipeline between the screw pump and the heat exchanger, a temperature sensor is connected to the cooling water outlet of the heat exchanger, a temperature sensor is connected to the cooling water inlet of the heat exchanger, a thermometer is connected to the pipeline between the heat exchanger and the fluidic device, and a pressure sensor is connected to the second pipeline.
4. The safe and stable high-temperature resistant hot water circulating pump system according to claim 3, wherein a temperature sensor is connected to the mechanical seal, a liquid storage tank (26) is arranged below the mechanical seal, a liquid level sensor (25) is arranged in the liquid storage tank, the hot water circulating pump is connected with the motor through a bearing box and a coupler, and one or more vibration-temperature integrated sensors are arranged on the bearing box; the data acquisition and transmission DTU is provided with a wireless control end.
5. A safe and stable high temperature resistant hot water circulating pump system as claimed in claim 1, wherein the diverter ring has a radial length R2, the impeller has a radius R1, and R1 is (2-5) R2.
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| CN202011427374.3A CN112682358B (en) | 2020-12-09 | 2020-12-09 | Safe and stable high-temperature-resistant hot water circulating pump system |
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| CN202011427374.3A CN112682358B (en) | 2020-12-09 | 2020-12-09 | Safe and stable high-temperature-resistant hot water circulating pump system |
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| CN112682358B true CN112682358B (en) | 2022-04-08 |
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| CN116221131B (en) * | 2023-04-10 | 2024-03-05 | 台州科技职业学院 | Adjusting device for improving cavitation resistance of water pump and control method |
| CN116576151B (en) * | 2023-05-31 | 2024-03-08 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated irrigation and fertilization device |
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Application publication date: 20210420 Assignee: ZHENJIANG JIANGSU UNIVERSITY ENGINEERING TECHNOLOGY Research Institute Assignor: ZHENJIANG INSTITUTE OF FLUID ENGINEERING EQUIPMENT TECHNOLOGY, JIANGSU University Contract record no.: X2023320000167 Denomination of invention: A Safe and Stable High Temperature Resistant Hot Water Circulating Pump System Granted publication date: 20220408 License type: Common License Record date: 20230710 |
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