CN216642476U - Emergency return circuit water replenishing diesel engine pump set with self-suction box - Google Patents
Emergency return circuit water replenishing diesel engine pump set with self-suction box Download PDFInfo
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- CN216642476U CN216642476U CN202123087718.3U CN202123087718U CN216642476U CN 216642476 U CN216642476 U CN 216642476U CN 202123087718 U CN202123087718 U CN 202123087718U CN 216642476 U CN216642476 U CN 216642476U
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Abstract
The utility model discloses a loop emergency water-replenishing diesel engine pump set with a self-suction box, which comprises a base and a water tank bracket, wherein the base is arranged in a carriage and is positioned on the left side of the water tank bracket; the base is used for mounting a diesel engine, a speed regulating gear box and a centrifugal pump of the pump set, an output shaft of the diesel engine is connected with an input end of the speed regulating gear box, and an output end of the speed regulating gear box is connected with a pump shaft of the centrifugal pump through a coupler; the water tank bracket is provided with a self-suction water tank, the inlet of the self-suction water tank is connected with a water tank inlet pipe, the outlet of the self-suction water tank is connected with the inlet of the centrifugal pump through a pump inlet pipe, and the liquid level in the self-suction water tank is higher than the water outlet of the centrifugal pump; after the pump set is provided with the self-sucking water tank, the vibration and the noise of the pump set can be effectively reduced, so that the operation of the pump set is more stable and reliable.
Description
Technical Field
The utility model relates to the technical field of emergency water replenishing pumps, in particular to a primary circuit emergency water replenishing diesel engine pump set with a self-suction box.
Background
The emergency water-replenishing diesel engine pump of the primary loop is used for being put into operation within 2.5 hours after an accident, replenishing water to the primary loop and cooling the reactor core; the diesel engine drives the rotation of the rotor, drives the rotation of the pump rotor through the speed increasing box and the coupling, and continuously transmits energy to the conveying liquid (water or water containing boron) by means of the power action of the rotating impeller on the liquid, so that the kinetic energy (mainly) and the pressure energy of the liquid are increased, and then the kinetic energy is converted into the pressure energy through the extrusion chamber of the pump cavity, when the liquid is thrown out from the impeller, the central part of the impeller causes a low-pressure area to form a pressure difference with the pressure of the sucked liquid surface, so that the liquid is continuously sucked and discharged at a certain pressure, and the liquid is continuously conveyed out.
The existing pump set is not provided with a self-suction box, so that the condition of dry grinding caused by water shortage in a pump cavity of the centrifugal pump when the pump set is started can occur, and the stable operation of the whole pump set is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a primary circuit emergency water replenishing diesel engine pump set with a self-suction water tank, which can effectively reduce vibration and noise of the pump set after the pump set is provided with the self-suction water tank, so that the pump set can run more stably and reliably.
The purpose of the utility model can be realized by the following technical scheme:
a loop emergency water-replenishing diesel engine pump set with a self-suction box comprises a base and a water tank bracket which are arranged in a carriage, wherein the base is positioned on the left side of the water tank bracket;
the base is used for installing a diesel engine, a speed regulating gear box and a centrifugal pump of the pump set, an output shaft of the diesel engine is connected with an input end of the speed regulating gear box, and an output end of the speed regulating gear box is connected with a pump shaft of the centrifugal pump through a coupler;
the water tank support is provided with a self-suction tank, an inlet of the self-suction tank is connected with a water tank inlet pipe, an outlet of the self-suction tank is connected with an inlet of the centrifugal pump through a pump inlet pipe, and the liquid level in the self-suction tank is higher than the water outlet of the centrifugal pump.
As a further scheme of the utility model: and the device also comprises sensors for detecting the temperature of the pump bearing, the pressure of the pump outlet and the flow rate of the pump outlet.
As a further scheme of the utility model: the self-priming water tank comprises a water tank body, the internal volume of the water tank body is larger than one cubic meter, a water inlet flange is arranged on the upper portion of one side wall of the water tank body, and a water outlet flange is arranged on the lower portion of the side wall of the water tank body adjacent to the water inlet flange.
As a further scheme of the utility model: the lower part of the side wall of the water tank main body, which is positioned on the water inlet flange, is provided with a water outlet interface, and the water outlet interface is provided with a water outlet valve.
As a further scheme of the utility model: the top central point of water tank main part puts and is provided with the exhaust interface, installs discharge valve on the exhaust interface.
As a further scheme of the utility model: the outlet of the centrifugal pump is connected with a water outlet pressure regulating assembly for regulating the water outlet flow of the pump body, and the water outlet pressure regulating assembly is connected with a water outlet pipe.
As a further scheme of the utility model: the water outlet pressure regulating assembly comprises a water outlet connecting pipe, and a first regulating valve and a third regulating valve are installed on the water outlet connecting pipe.
As a further scheme of the utility model: the water outlet connecting pipe is connected with a pressure regulating branch pipe, an outlet of the pressure regulating branch pipe is communicated with a water outlet pipe, and a second regulating valve is installed on the pressure regulating branch pipe.
The utility model has the beneficial effects that:
(1) the conveying medium of the pump set is boron-containing water at 50 ℃, the inlet pressure of the pump set is 0-0.005 Mpa, the water inlet pressure is too low, and certain hidden dangers exist when the pump set is started to operate. After the self-suction box is configured, the water inlet pipe of the pump between the whole multistage centrifugal pump and the self-suction box can be completely filled with water, so that the hidden danger caused by low water inlet pressure of the pump is eliminated, the pump cavity of the centrifugal pump is filled with water, and the dry grinding condition caused by water shortage in the pump cavity of the centrifugal pump can not be generated when the pump set is started.
(2) The inlet pressure of a loop emergency water replenishing diesel engine pump set is 0-0.005 Mpa, and when the medium pressure is 0, nearly 1m is formed in the self-priming water tank3The water pump set can quickly exhaust air in the pump water inlet pipe of the self-sucking water tank after being started, and suck water, so that the function of quick self-sucking is achieved.
(3) After the pump set is provided with the self-priming water tank, the pump set is nearly 1m in the self-priming water tank3The water level in the water suction box is far higher than the height of a flange at the water outlet of the multistage centrifugal pump, so that the suction condition of the inlet of the centrifugal pump is more superior, the pressure at the inlet of the centrifugal pump is always positive pressure, the vibration and the noise of the pump set can be effectively reduced, and the pump set can run more stably and reliably.
Drawings
The utility model will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic top view of the present invention in its entirety;
FIG. 3 is a schematic front view of the self-suction box of the present invention;
FIG. 4 is a schematic side view of the self-suction box of the present invention.
In the figure: 1. a base; 2. a diesel engine; 3. a speed-regulating gear box; 4. a coupling; 5. a centrifugal pump; 6. a water outlet pressure regulating assembly; 61. a water outlet connecting pipe; 62. a pressure regulating branch pipe; 63. a first regulating valve; 64. a second regulating valve; 65. a third regulating valve; 7. a self-suction tank; 71. a water tank main body; 72. a water inlet flange; 73. a water drainage interface; 74. a water outlet flange; 75. an exhaust interface; 76. lifting lugs; 8. a water tank bracket; 9. a pump water inlet pipe; 10. a pump-out water pipe; 11. a water inlet pipe of the water tank.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1 and 2, the utility model relates to a primary circuit emergency water-replenishing diesel engine pump set with a self-suction tank, which comprises a base 1 and a water tank bracket 8, wherein the base 1 is arranged in a carriage and is positioned at the left side of the water tank bracket 8; the base 1 is used for installing a diesel engine 2, a speed regulating gear box 3 and a centrifugal pump 5 of a pump set, an output shaft of the diesel engine 2 is connected with an input end of the speed regulating gear box 3, and an output end of the speed regulating gear box 3 is connected with a pump shaft of the centrifugal pump 5 through a coupling 4; it has from suction box 7 to settle on the water tank support 8, has water tank inlet tube 11 from 7 entry connections of suction box, and the export of self suction box 7 passes through pump inlet tube 9 and links to each other with centrifugal pump 5's import, and the liquid level height in the self suction box 7 is higher than centrifugal pump 5's delivery port height.
The centrifugal pump 5 of the pump group adopts a horizontal sectional type multistage centrifugal pump, the supporting mode of the pump is central support, two ends of the pump are supported by rolling bearings, wherein the tail end support adopts a double-row roller bearing and is mainly used for bearing axial force and radial force; the driving end adopts a single-row roller bearing which is mainly used for bearing radial force, and rolling bearings are respectively arranged in supporting frames at two ends of the pump.
The inlet and the outlet of the centrifugal pump 5 are both positioned on the upper part of the pump set, the inlet is connected to the self-suction box 7, the outlet is connected with the water outlet pressure regulating assembly 6, and the inlet and the outlet of the centrifugal pump 5 are both arranged on the left side surface of the carriage when seen from the tail part of the carriage to the head direction.
The rated maximum lift of a loop emergency water replenishing pump set reaches 900m, twelve stages of impellers are provided, and for effectively balancing axial force, the impellers of the pump are designed in a back-to-back arrangement mode according to six stages in the left direction and six stages in the right direction. The front six-stage impeller is positioned on one side of the water inlet section and gradually reaches the sixth-stage impeller close to the middle part of the pump, and then the pressure water is communicated with the first-stage impeller of the back six-stage impeller through the middle pipe and gradually reaches the twelfth stage of the water outlet section positioned in the middle part of the pump, so that the reverse balance of the hydraulic axial force of the front six-stage impeller and the back six-stage impeller can be realized, and the pump has a good service life.
The bearing chamber gland at two ends of the centrifugal pump 5 is designed with a dustproof disc structure to prevent dust or other impurities from entering the bearing chamber, and the outside of the bearing chambers at two ends is provided with an oil level window and a constant position oil cup to observe the oil level of lubricating oil and automatically supplement the lubricating oil.
The shaft seal of the centrifugal pump 5 adopts single end face balance type integrated mechanical seal. Two groups of mechanical seals are respectively arranged in the sealing cavities which are symmetrical to the two sides of the shell. Machine seal washing and cooling mode: the first-stage shell part is connected with a flushing pipe which is respectively communicated with the pipe nozzle positions of the two side sealing cavities, and flushing and cooling liquid of the mechanical seal is working liquid of the pump.
The pump set system is also provided with sensors for detecting the temperature of a pump bearing, the pressure of an outlet of the pump and the flow of the outlet of the pump, and the sensors are all wired into a local control system of the pump, so that the operation condition of the pump can be monitored in real time.
Referring to fig. 1, an outlet of the centrifugal pump 5 is connected to a water outlet pressure regulating assembly 6 for regulating the flow rate of the outlet water of the pump body, and the water outlet pressure regulating assembly 6 is connected to a water outlet pipe 10. The water outlet pressure regulating assembly 6 comprises a water outlet connecting pipe 61, and a first regulating valve 63 and a third regulating valve 65 are mounted on the water outlet connecting pipe 61. The water outlet connecting pipe 61 is connected with a pressure regulating branch pipe 62, the outlet of the pressure regulating branch pipe 62 is communicated with the water outlet pipe 10, and a second regulating valve 64 is arranged on the pressure regulating branch pipe 62.
The arrangement of the water outlet pressure regulating assembly 6 enables the pump set to be normally used under different working conditions, and the use performance of the pump set is ensured.
Referring to fig. 3 and 4, the self-suction box 7 includes a main body 71, the internal volume of the main body 71 is greater than one cubic meter, a water inlet flange 72 is disposed on an upper portion of a sidewall of the main body 71, and a water outlet flange 74 is disposed on a lower portion of a sidewall of the main body 71 adjacent to the water inlet flange 72. The lower part of the side wall of the water tank main body 71 positioned on the water inlet flange 72 is provided with a drainage interface 73, and a drainage valve is arranged at the drainage interface 73. The central position of the top of the water tank main body 71 is provided with an exhaust interface 75, the exhaust interface 75 is provided with an exhaust valve, and four corners of the upper end of the water tank main body 71 are provided with lifting lugs 76 for lifting and mounting the water tank main body 71.
As the conveying medium of the loop emergency water-replenishing diesel engine pump set is boron-containing water at 50 ℃, the inlet pressure of the loop emergency water-replenishing diesel engine pump set is 0-0.005 Mpa, the water inlet pressure is too low, and certain hidden danger exists when the pump set is started to operate. After the self-suction box 7 is configured, the pump water inlet pipe 9 between the whole multistage centrifugal pump 5 and the self-suction box 7 can be completely filled with water, so that the hidden trouble caused by low water inlet pressure of the pump is eliminated, the pump cavity of the centrifugal pump 5 is filled with water, and the dry grinding condition caused by water shortage in the pump cavity of the centrifugal pump 5 can not be generated when the pump set is started.
The inlet pressure of a loop emergency water replenishing diesel engine pump set is 0-0.005 Mpa, and when the medium pressure is 0, nearly 1m is formed in the self-priming water tank 73The water pump set can quickly exhaust air in the pump water inlet pipe 9 of the self-sucking water tank 7 after being started, and suck water, so that the function of quick self-sucking is achieved.
After the pump set is provided with the self-suction water tank 7, nearly 1m is arranged in the self-suction water tank 73The water level height in the self-sucking water tank 7 is far higher than the height of a water outlet flange of the multistage centrifugal pump 5, so that the inlet suction condition of the centrifugal pump 5 is more superior, the inlet pressure of the centrifugal pump 5 is always positive pressure, the vibration and the noise of a pump set can be effectively reduced, and the pump set can run more stably and reliably.
Performance parameter table of loop emergency water-replenishing diesel engine pump set
The specific operation method of the primary loop emergency water replenishing diesel engine pump set comprises the following steps:
operating point 1: flow rate: 15m3H; lift: 165 m;
the method comprises the following operation steps:
1. checking and ensuring that the pump set and the self-priming water tank 7 are filled with water and the pump has a starting condition;
2. closing the first, second and third regulating valves;
3. starting the diesel engine 2, and slowly adjusting the diesel engine 2 to enable the rotating speed of the speed regulating gearbox 3 to reach about 1250 revolutions per minute;
4. the second control valve 64 was opened slowly and the flow rate on the meter display was observed to a prescribed value of 15m3The lift value under the flow is about 165m, and if a little deviation exists, the rotation speed of the diesel engine 2 can be adjusted;
operating point 2: flow rate: 30m3H; lift: 195 m;
the method comprises the following operation steps:
1. checking and ensuring that the pump set and the self-priming water tank 7 are filled with water and the pump has a starting condition;
2. closing the first, second and third regulating valves;
3. starting the diesel engine 2, and slowly adjusting the diesel engine 2 to enable the rotating speed of the speed regulating gearbox 3 to reach about 1500 revolutions per minute;
4. the second control valve 64 is opened slowly and the flow rate on the meter display is observed until the specified 30m3The lift value under the flow is about 195m, and if a little deviation exists, the rotation speed of the diesel engine 2 can be adjusted;
operating point 3: flow rate: 45m3H; lift: 900 m;
the method comprises the following operation steps:
1. checking and ensuring that the pump set and the self-priming water tank 7 are filled with water and the pump has a starting condition;
2. closing the first, second and third regulating valves;
3. starting the diesel engine 2, and slowly adjusting the diesel engine 2 to enable the rotating speed of the speed regulating gearbox 3 to be about 2950 revolutions per minute;
4. the second control valve 64 was opened slowly and the flow rate on the meter display was observed up to a specified value of 45m3The head value at this flow rate is about 900m, and if there is a slight deviation, it can be achieved by adjusting the rotation speed of the diesel engine 2.
Operating point 4: flow rate: 45m3H; lift: 300 m;
the method comprises the following operation steps:
1. checking and ensuring that the pump set and the self-priming water tank 7 are filled with water and the pump has a starting condition;
2. closing the first, second and third regulating valves;
3. starting the diesel engine 2, and slowly adjusting the diesel engine 2 to enable the rotating speed of the speed regulating gearbox 3 to reach about 2950 revolutions per minute;
4. the first control valve 63 was opened to about 2/3 degrees, then the third control valve 65 was opened slowly and the flow rate on the meter display was observed to a prescribed 45m3The head value at this flow rate is about 300m, and if there is a slight deviation, it can be achieved by adjusting the rotation speed of the diesel engine 2.
Operating point 5: flow rate: 45m3H; lift: 246 m;
the method comprises the following operation steps:
1. checking and ensuring that the pump set and the self-priming water tank 7 are filled with water and the pump has a starting condition;
2. closing the first, second and third regulating valves;
3. starting the diesel engine 2, and slowly adjusting the diesel engine 2 to enable the rotating speed of the speed regulating gearbox 3 to reach about 2800 revolutions per minute;
4. the first control valve 63 was opened to about 2/3 degrees, then the third control valve 65 was opened slowly and the flow rate on the meter display was observed to a prescribed 45m3The lift value at this flow rate is about 246m, and if there is a little deviation, the lift value can be realized by adjusting the rotating speed of the diesel engine.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A primary loop emergency water replenishing diesel engine pump set with a self-suction box is characterized by comprising a base (1) and a water tank support (8) which are arranged in a carriage, wherein the base (1) is positioned on the left side of the water tank support (8);
the base (1) is used for installing a diesel engine (2), a speed regulating gear box (3) and a centrifugal pump (5) of the pump set, an output shaft of the diesel engine (2) is connected with an input end of the speed regulating gear box (3), and an output end of the speed regulating gear box (3) is connected with a pump shaft of the centrifugal pump (5) through a coupler (4);
the water tank bracket (8) is provided with a self-suction tank (7), an inlet of the self-suction tank (7) is connected with a water tank water inlet pipe (11), an outlet of the self-suction tank (7) is connected with an inlet of the centrifugal pump (5) through a pump water inlet pipe (9), and the liquid level in the self-suction tank (7) is higher than the water outlet of the centrifugal pump (5).
2. A primary circuit emergency water-replenishing diesel engine pump unit with a self-suction box as claimed in claim 1, characterized by further comprising sensors for detecting the temperature of the pump bearing, the pressure of the pump outlet and the flow rate of the pump outlet.
3. A loop emergency water-replenishing diesel pump set with a self-suction box according to claim 1, characterized in that the self-suction box (7) comprises a water tank main body (71), the internal volume of the water tank main body (71) is more than one cubic meter, a water inlet flange (72) is arranged on the upper portion of one side wall of the water tank main body (71), and a water outlet flange (74) is arranged on the lower portion of the side wall of the water tank main body (71) adjacent to the water inlet flange (72).
4. A primary circuit emergency water-replenishing diesel engine pump unit with a self-suction tank as claimed in claim 3, characterized in that the lower part of the side wall of the water tank main body (71) on the water inlet flange (72) is provided with a water discharge interface (73), and a water discharge valve is installed at the water discharge interface (73).
5. A primary loop emergency water replenishing diesel engine set with a self-suction box as claimed in claim 4, characterized in that the central position of the top of the water tank main body (71) is provided with an exhaust interface (75), and the exhaust interface (75) is provided with an exhaust valve.
6. A primary circuit emergency water-replenishing diesel engine pump set with a self-suction box as claimed in claim 1, characterized in that the outlet of the centrifugal pump (5) is connected with a water outlet pressure regulating assembly (6) for regulating the water outlet flow of the pump body, and the water outlet pressure regulating assembly (6) is connected with a water outlet pipe (10).
7. A primary circuit emergency water-replenishing diesel engine pump set with a self-suction box according to claim 6, characterized in that the outlet pressure regulating assembly (6) comprises an outlet connecting pipe (61), and a first regulating valve (63) and a third regulating valve (65) are mounted on the outlet connecting pipe (61).
8. A primary loop emergency water replenishing diesel engine pump set with a self-suction box as claimed in claim 7, characterized in that the outlet connecting pipe (61) is connected with a pressure regulating branch pipe (62), the outlet of the pressure regulating branch pipe (62) is communicated with the outlet water pipe (10), and the pressure regulating branch pipe (62) is provided with a second regulating valve (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123087718.3U CN216642476U (en) | 2021-12-09 | 2021-12-09 | Emergency return circuit water replenishing diesel engine pump set with self-suction box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123087718.3U CN216642476U (en) | 2021-12-09 | 2021-12-09 | Emergency return circuit water replenishing diesel engine pump set with self-suction box |
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| Publication Number | Publication Date |
|---|---|
| CN216642476U true CN216642476U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123087718.3U Active CN216642476U (en) | 2021-12-09 | 2021-12-09 | Emergency return circuit water replenishing diesel engine pump set with self-suction box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216642476U (en) |
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2021
- 2021-12-09 CN CN202123087718.3U patent/CN216642476U/en active Active
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