CN114294242A - Working method of drainage type constant-pressure self-priming pump with internal open type pressure relief valve body - Google Patents
Working method of drainage type constant-pressure self-priming pump with internal open type pressure relief valve body Download PDFInfo
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- CN114294242A CN114294242A CN202111671432.1A CN202111671432A CN114294242A CN 114294242 A CN114294242 A CN 114294242A CN 202111671432 A CN202111671432 A CN 202111671432A CN 114294242 A CN114294242 A CN 114294242A
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Abstract
The invention relates to a working method of a drainage type constant-pressure self-priming pump with an internal open type pressure relief valve body, wherein the drainage pump rotates together due to the rotation of a motor rotating shaft, so that air in a pump inlet is quickly discharged into the pump body and then discharged out of a pump outlet through an impeller, the rotation of the drainage pump enables the air in the pump inlet to be continuously discharged into a suction cavity through the drainage pump and then discharged out of the pump outlet through the impeller, and the air in the suction cavity is repeatedly and infinitely close to being discharged out of the suction cavity; the liquid in the external storage tank is sucked into the suction cavity through the drainage pump, and then the liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force, enters the discharge pipeline from the pump outlet and is conveyed to a required place. The invention improves the conveying capacity of the impeller, and is suitable for conveying liquids with different viscosities by adjusting the adjusting screw rod with the internal open type pressure relief valve body.
Description
Technical Field
The invention relates to a working method of a drainage type constant-pressure self-priming pump with an inward opening type pressure relief valve body.
Background
A pump: is a machine for transporting liquids.
The pump is divided into according to its theory of operation: dynamic pumps (vane), positive displacement pumps (positive displacement), other types of pumps. A dynamic pump (impeller type) is a pump that uses an impeller rotating at a high speed to transfer liquid by applying work to the liquid by a blade, such as a centrifugal pump, a vortex pump, a mixed flow pump, and an axial flow pump. According to the impeller suction mode: single and multiple suction pumps; dividing according to the number of impellers: single stage pumps and multi-stage pumps; dividing according to the position of a pump shaft: horizontal pumps and vertical pumps, etc.; according to the installation height and the working mode of the pump: self-priming centrifugal pumps and suction centrifugal pumps.
The centrifugal pump is characterized in that: 1. the structure is simple, the operation is easy, and the adjustment and the control are convenient; 2, the flow is uniform, and the benefit is high; 3. the application range of flow and pressure is wide; 4. the conveying device is suitable for conveying corrosive or suspended liquid, and has the advantages of low running noise, low manufacturing cost, durability, excellent stability and the like.
The self-priming centrifugal pump has certain self-priming capacity, makes up the defect that the common suction type centrifugal pump has no self-priming capacity, and can meet the requirement of self-priming conveying of fluids below the pump level in various industries. When general large-flow liquid is conveyed, the self-filling centrifugal pump has excellent performance because of the advantages of simple structure, higher benefit, low noise, low manufacturing cost and the like.
However, in practical use, the self-priming centrifugal pump cannot be used particularly for some liquids with viscosity, and the viscosity of the liquid is greatly changed along with the change of temperature, particularly for conveying low-temperature (the viscosity of the liquid is increased at low temperature) and some liquids with viscosity.
The reason is as follows:
1. in order to adapt to low temperature and some viscosity liquid, the centrifugal pump needs to have larger suction force and an enlarged impeller to obtain larger inertial centrifugal force; meanwhile, the shaft power is increased, and the power of the motor is increased to make up the condition that the self-priming centrifugal pump operates at low temperature and with some viscous liquid; thus, certain flow speed and flow can be achieved, and the output liquid pressure is met. Especially in low temperature viscosity liquid, the output liquid pressure is large due to the poor liquidity of the liquid, thus increasing the shaft power and possibly overloading and burning the motor.
2. When the pump is just started, because the mixture proportion of air and liquid is different, the load force of the impeller is different, so that the unbalance of output pressure is caused, the power of the motor shaft is unbalanced, the operation of the motor is unstable, and the service lives of the impeller and the motor are greatly shortened.
3. Because when increasing the shaft power, when carrying high temperature liquid, that is to say when the viscosity of liquid changes by a wide margin into low viscosity liquid along with the change of temperature, the self priming pump is carried liquid and is expected to reach certain velocity of flow and flow, because liquid viscosity is little, and mobility is good, carries liquid pressure also for a short time. Therefore, the pressure difference between some viscosity liquid in a self-priming pump conveying low-temperature zone and the high-temperature low-viscosity liquid is large, the self-priming centrifugal pump cannot automatically adjust the output pressure, the pressure value of the output liquid cannot be kept to meet the working condition requirement all the time, and the equipment system is unstable.
4. In practical operation, especially for some liquid with viscosity and the viscosity of the liquid is changed greatly with the change of temperature, especially at low temperature and some viscosity liquid, the self-filling centrifugal pump drives the impeller on the rotating shaft to rotate due to the influence of its characteristics (the pump is operated by the rotating shaft of the motor, if there is no liquid in the pump and only air is, the density of the air is very low, the centrifugal force generated after the rotation is small, so the low pressure formed in the central area of the impeller is not enough to suck the liquid in the external storage tank into the pump, after a certain amount of liquid is added into the pump body, the pump shaft drives the impeller to rotate together to force the liquid among the blades to rotate, the liquid is thrown from the center of the impeller to the periphery under the action of inertial centrifugal force and obtains energy, so that the static pressure of the liquid flowing to the periphery of the impeller is increased, the flow velocity is increased, after the liquid leaves the impeller and enters the extrusion cavity in the pump body, the liquid is decelerated due to the gradual expansion of the flow channel of the pump body, most of kinetic energy is converted into static pressure, and then the liquid with higher pressure enters the discharge pipeline from the discharge port of the pump and is conveyed to a required place. ) In the process, the self-priming centrifugal pump needs to discharge air in the pump body and the inlet pipe for a long time, generally more than 5-10 minutes, or the air cannot be discharged completely, the suction force of the impeller is far lower than one atmospheric pressure, so that the suction lift of the centrifugal pump is very small and cannot meet daily use, and particularly, the liquid cannot be used at a height of 5-9 meters below the pump level.
Therefore, it is particularly important to find a drainage type constant pressure self-priming pump with an internal open pressure relief valve body, which can adapt to the transportation of low-temperature and high-viscosity liquid and also can adapt to the transportation of high-temperature and low-viscosity liquid, and has stable operation of a motor and stable output pressure.
Disclosure of Invention
The invention aims to overcome the defects and provide a working method of the drainage type constant pressure self-priming pump with the internal open type pressure relief valve body, which can adapt to the transportation of low-temperature and high-viscosity liquid and also adapt to the transportation of high-temperature and low-viscosity liquid, the stable operation of a motor and the stable output pressure, so that the system has high operation reliability, constant pressure, difficult damage and stable operation.
The purpose of the invention is realized as follows:
1. a working method of a drainage type constant pressure self-priming pump with an internal open type pressure relief valve body is characterized in that the drainage type constant pressure self-priming pump with the internal open type pressure relief valve body comprises a pump body and a motor which are arranged on the left and the right, the pump body comprises a pump shell, an intake cavity, an impeller cavity, a pressing cavity and a pressure relief cavity are arranged in the pump shell, the lower half section of the right side of the pump shell is provided with a pump body flange, the left side of the pump body flange is the impeller cavity, an impeller is arranged in the impeller cavity, the intake cavity is positioned above the left side of the impeller cavity and communicated with the inlet at the left end of the impeller cavity, the pressing cavity is communicated with the top of the impeller cavity, the pressure relief cavity is communicated with the bottom of the impeller cavity, the pump shell at the left side of the intake cavity is provided with a pump inlet, an inlet check valve is arranged at the pump inlet, the pump outlet is arranged at the pump shell at the top of the pressing cavity, and the lower left corner of the intake cavity is provided with a liquid return port, the liquid return port is communicated up and down, the upper left corner of the pressure relief cavity is provided with a pressure relief port, the pressure relief port is communicated left and right, the liquid return port is positioned above the left side of the pressure relief port, a pressure relief valve body mounting position is formed in the region between the liquid return port and the pressure relief port, the pressure relief valve body mounting position at the lower left section of the pump shell is provided with an inward opening type pressure relief valve body, the inward opening type pressure relief valve body is provided with a pressure relief inlet and a pressure relief outlet, the pressure relief inlet is communicated with the pressure relief port, and the pressure relief outlet is communicated with the liquid return port; the motor comprises a motor main body, the bottom of the motor main body is connected with a pump base, a motor flange is arranged at the left end of the motor main body, the motor flange is fixedly connected with a pump body flange on the left side of the motor main body through a bolt, a motor rotating shaft extends leftwards from the motor main body and extends leftwards to the left of the motor flange, the motor rotating shaft sequentially penetrates through the pump body flange and the impeller leftwards, and the left end of the motor rotating shaft is fixedly connected with the left end face of the impeller through an impeller fixing screw; the middle part of the left end of the pump body is also provided with a drainage pump, a drainage pump inlet pipeline is arranged in the pump body outside the inlet check valve and is connected with the inlet of the drainage pump, a drainage pump outlet pipeline is arranged in the pump body inside the inlet check valve, the outlet of the drainage pump is connected with the drainage pump outlet pipeline, namely, the fluid entering from the pump inlet can be divided into two branches, one branch directly enters the suction cavity through the inlet check valve, and the other branch enters the suction cavity through the drainage pump inlet pipeline, the drainage pump and the drainage pump outlet pipeline; the specific working method comprises the following steps:
the drainage pump rotates together due to the rotation of the motor rotating shaft, air in the pump inlet is rapidly discharged into the pump body and then discharged out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, when the pump is just started, because the suction cavity and the pump inlet of the pump body are the same as the atmospheric pressure, when the impeller rotates at a high speed, the air in the suction cavity is discharged out of the pump outlet through the centrifugal force of the impeller, at the moment, the suction cavity is negative pressure, the pressure of the pump inlet is atmospheric pressure and is larger than the pressure of the suction cavity, so that the inlet check valve is opened, meanwhile, the drainage pump also rotates together, simultaneously, the air in the pump inlet is introduced into the suction cavity, and then the air is discharged out of the pump outlet through the impeller, and the process is repeated; until the pressures of the suction cavity and the pump inlet are balanced, the inlet check valve is closed, the rotation of the drainage pump enables the air at the pump inlet to be continuously discharged into the suction cavity through the drainage pump, and then the impeller discharges the air out of the pump outlet, so that the air in the suction cavity is infinitely exhausted in a circulating manner; the liquid in the external storage tank is sucked into the suction cavity through the drainage pump, and then the liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force, enters the discharge pipeline from the pump outlet and is conveyed to a required place.
Preferably, the motor comprises a motor body, the bottom of the motor body is connected with the pump base, a motor flange is arranged at the left end of the motor body, the motor flange is fixedly connected with a pump body flange on the left side of the motor body through a bolt, a motor rotating shaft extends leftwards from the motor body and extends leftwards to the left of the motor flange, the motor rotating shaft sequentially penetrates through the pump body flange and the impeller leftwards, and the left end of the motor rotating shaft is fixedly connected with the left end face of the impeller through an impeller fixing screw.
As a preferred, the left end middle part of the pump body still is provided with a drainage pump, be provided with a drainage pump inlet pipeline in the pump body in the import check valve outside, the entry of drainage pump inlet pipeline connection drainage pump, be provided with a drainage pump outlet pipe way in the pump body of import check valve inboard, the exit linkage drainage pump outlet pipe way of drainage pump, the fluid that the pump import that also says so got into can divide two, one directly gets into through the import check valve and inhales the chamber, still one gets into again through drainage pump inlet pipeline, drainage pump and drainage pump outlet pipe and inhales the chamber.
Preferably, the drainage pump comprises a drainage pump shell, a driven gear and a driving gear which are arranged up and down are arranged in the drainage pump shell, the driven gear and the driving gear are meshed with each other, the height of the mutual meshing is called the meshing height, the driven gear penetrates through a transverse driven shaft, the driving gear penetrates through a transverse driving shaft, the left end and the right end of the driven shaft are arranged in a driven shaft cavity of the upper half section in the drainage pump shell through bearings, the inner diameter of the driven shaft cavity is matched with the size of the driven gear, the left end and the right end of the driving shaft are arranged in a driving shaft cavity of the lower half section in the shell of the drainage pump through bearings, the inner diameter of the driving shaft cavity is matched with the size of the driving gear, the right end of the driving shaft penetrates out of the drainage pump shell and is in power connection with a rotating shaft of the motor through a linkage shaft, and a driving shaft seal is arranged at the joint of the driving shaft and the linkage shaft; the drainage pump shell includes the drainage pump shell end cover of the drainage pump shell main casing body and the left end of half section on the right side, and drainage pump shell end cover passes through the screw fixation on the drainage pump shell main casing body, drainage pump shell right-hand member still is equipped with inlet opening, exit hole and initiative shaft hole left, inlet opening intercommunication feed liquor oral cavity, the oral cavity of feed liquor highly be a little higher than the meshing height and with the axle core staggered arrangement in driven shaft chamber, exit hole intercommunication liquid oral cavity, the oral cavity of liquid highly be a little less than the meshing height and with the axle core staggered arrangement in initiative axle chamber, the axis of driven shaft forms a vertical axis plane with the axis of driving shaft, inlet opening and exit hole are located axis plane front and back both sides respectively, initiative shaft hole and driving shaft are arranged with one heart. The inlet pipeline of the drainage pump is connected with the inlet hole, and the outlet pipeline of the drainage pump is connected with the outlet hole.
Preferably, the pump body and the motor are mounted together on a pump mount.
Preferably, a foam breaker is arranged at the extrusion cavity right below the pump outlet, and a buffer cavity is arranged right below the foam breaker.
As an optimization, a liquid filling port is further arranged on the pump shell at the top of the extrusion cavity, the liquid filling port is located at the upper left of the extrusion cavity, and a liquid filling port bolt is arranged at the position of the liquid filling port.
Preferably, a liquid discharging port is arranged on the pump shell at the left end of the pressure relief cavity, and a liquid discharging port bolt is arranged at the liquid discharging port.
Compared with the prior art, the invention has the beneficial effects that:
according to the self-sucking pump, the internally-opened pressure relief valve body is adopted, so that liquid initially entering an impeller cavity of the self-sucking pump can return to a sucking cavity through the internally-opened pressure relief valve body, the self-sucking pump impeller cavity is quickly filled with the liquid, the impeller is prevented from idling, the conveying capacity of the impeller is improved, and the conveying of liquid with different viscosities is adapted through adjusting the adjusting screw rod with the internally-opened pressure relief valve body. The invention has the advantages of being suitable for conveying low-temperature and high-viscosity liquid, being suitable for conveying high-temperature and low-viscosity liquid, stably operating the motor and stabilizing the output pressure.
Drawings
Fig. 1 is a schematic structural view of a drainage type constant pressure self-priming pump with an inward opening pressure relief valve body in embodiment 1.
Fig. 2 is a schematic view of the detachable inward-opening adjustable relief valve in embodiment 1.
Fig. 3 is another state diagram of fig. 2.
Fig. 4 is an exploded view of fig. 2.
Fig. 5 is a schematic structural view of a drainage type constant pressure self-priming pump with an inward opening pressure relief valve body according to embodiment 2.
Fig. 6 is a schematic view of the detachable inward-opening adjustable relief valve in embodiment 2.
Fig. 7 is another state diagram of fig. 6.
Fig. 8 is an exploded view of fig. 6.
Fig. 9 is a schematic view of the drainage pump of fig. 1.
FIG. 10 is an exploded view of FIG. 9
FIG. 11 is a cross-sectional view of a pump.
Fig. 12 is a perspective cross-sectional view of a drainage pump.
Fig. 13 is a right side view of the drainage pump.
Wherein:
the drainage pump 400, the drainage pump shell 401, the drainage pump shell main shell 401.1, the drainage pump shell end cover 401.2, the driven gear 402, the driving gear 403, the driven shaft 404, the driving shaft 405, the inlet hole 406, the outlet hole 407, the driving shaft hole 408, the linkage shaft 409, the driven shaft cavity 410, the driving shaft cavity 411 and the driving shaft seal 412
The self-priming pump 700 comprises an internal open type pressure relief valve body, a pump body 701, a pump housing 701.1, a suction cavity 701.2, an impeller cavity 701.3, a pressing cavity 701.4, a pressure relief cavity 701.5, a pump body flange 701.6, an impeller 701.7, a pump inlet 701.8, an inlet check valve 701.9, a pump outlet 701.10, a defoamer 701.11, a liquid filling opening 701.12, a liquid filling opening bolt 701.13, a liquid discharge opening 701.14, a liquid discharge opening bolt 701.15, a liquid return opening 701.16, a pressure relief opening 701.17, a buffer cavity 701.18, a motor 702, a motor main body 702.1, a motor flange 702.2, a motor rotating shaft 702.3, an impeller fixing screw 702.4, a pump base 703
Detachable inward-opening type pressure relief valve body 610, pressure relief inlet 610.1, pressure relief outlet 610.2, valve body shell 611, valve body flange 611.1, adjusting screw rod 612, spring 613, valve core 614, locking nut 615 and sealing ring 616
Internal opening type adjustable pressure relief valve 620
An internally open adjustable spherical pressure relief valve 630.
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 the drawings, the invention relates to a flow-guiding type constant pressure self-priming pump 700 with an inward opening pressure relief valve body, which comprises a pump body 701 and a motor 702, wherein the pump body 701 and the motor 702 are jointly installed on a pump base 703, the pump body 701 and the motor 702 are arranged on the left and right, the pump body 701 comprises a pump housing 701.1, the bottom of the pump housing 701.1 is connected with the pump base 703, a suction cavity 701.2, an impeller cavity 701.3, a pressure relief cavity 701.4 and a pressure relief cavity 701.5 are arranged in the pump housing 701.1, the lower half section of the right side of the pump housing 701.1 is provided with a pump flange 701.6, the left side of the pump flange 701.6 is provided with the impeller cavity 701.3, the impeller cavity 701.3 is provided with an impeller 701.7, the suction cavity 701.2 is positioned above the left side of the impeller cavity 701.3 and is communicated with a left end inlet of the impeller cavity 701.3, the pressure relief cavity 701.4 is communicated with the top of the impeller cavity 701.3, the pressure relief cavity 701.5 is communicated with the bottom of the pump 701.3, the pump housing 701.2 is provided with a pump inlet 701.8, an inlet check valve 701.9 is arranged at a pump inlet 701.8, a pump outlet 701.10 is arranged on a pump housing 701.1 at the top of an extrusion cavity 701.4, a defoamer 701.11 is arranged at the extrusion cavity 701.4 right below the pump outlet 701.10, a buffer cavity 701.18 is arranged right below the defoamer 701.11, a filling port 701.12 is further arranged on the pump housing 701.1 at the top of the extrusion cavity 701.4, the filling port 701.12 is positioned at the upper left of the extrusion cavity 701.4, a filling port bolt 701.13 is arranged at the filling port 701.12, a liquid discharging port 701.14 is arranged on the pump housing 701.1 at the left end of the pressure discharging cavity 701.5, a liquid discharging port bolt 701.15 is arranged at the liquid discharging port 701.14, a liquid return port 701.16 is arranged at the lower left corner of the suction cavity 701.2, the liquid return port 701.16 is communicated up and down, a pressure relief port 701.17 is arranged at the upper left corner of the pressure discharging cavity 701.5, the pressure relief port 701.17 is communicated left and right, a liquid return port 701.16 is positioned at the upper left side of the pressure relief 701.17, and a pressure relief valve body mounting position is formed between the liquid return port 701.16 and the pressure relief port 701.17, the pressure relief valve body installation position of pump casing 701.1 left side lower segment department is provided with an interior open pressure relief valve body, and interior open pressure relief valve body has a pressure relief import 610.1 and a pressure relief export 610.2, and pressure relief import 610.1 communicates with pressure relief port 701.17, and pressure relief export 610.2 communicates with liquid return port 701.16.
The motor 702 comprises a motor body 702.1, the pump base 703 is connected to the bottom of the motor body 702.1, the left end of the motor body 702.1 is provided with a motor flange 702.2, the motor flange 702.2 passes through bolt fixed connection with the pump body flange 701.6 on the left side thereof, the motor body 702.1 stretches out to the left motor rotating shaft 702.3 and the motor rotating shaft 702.3 stretches out to the left of the motor flange 702.2, the motor rotating shaft 702.3 also passes through the pump body flange 701.6 and the impeller 701.4 to the left in sequence, and the left end of the motor rotating shaft 702.3 passes through the left end face fixed connection of the impeller fixing screw 702.4 and the impeller 701.7.
The left end middle part of the pump body 701 still is provided with a drainage pump 400, be provided with a drainage pump inlet pipeline 708 in the pump body 701 in the import check valve 701.9 outside, the entry of drainage pump 400 is connected to drainage pump inlet pipeline 708, be provided with a drainage pump outlet pipeline 709 in the pump body 701 of import check valve 701.9 inboard, drainage pump outlet pipeline 709 is connected to the export of drainage pump 400, and the fluid that pump inlet 701.8 got into that says so can divide two, and one directly gets into through import check valve 701.9 and inhales chamber 701.2, and another gets into again and inhales chamber 701.2 through drainage pump inlet pipeline 708, drainage pump 400 and drainage pump outlet pipeline 709.
The drainage pump 400 comprises a drainage pump shell 401, a driven gear 402 and a driving gear 403 which are arranged up and down are arranged in the drainage pump shell 401, the driven gear 402 and the driving gear 403 are meshed with each other, the height of the mutual meshing is called the meshing height, the driven gear 402 passes through a transverse driven shaft 404, the driving gear 403 passes through a transverse driving shaft 405, the left end and the right end of the driven shaft 404 are installed in a driven shaft cavity 410 of the upper half section in the drainage pump shell 401 through bearings, the inner diameter of the driven shaft cavity 410 is matched with the size of the driven gear 402, the left end and the right end of the driving shaft 405 are installed in a driving shaft cavity 411 of the lower half section in the drainage pump shell 401 through bearings, the inner diameter of the driving shaft cavity 411 is matched with the size of the driving gear, the right end of the driving shaft 405 penetrates out of the drainage pump shell 401 and is in power connection with a motor rotating shaft 702.3 through a linkage shaft 409, of course, the motor rotating shaft 702.3 may be driven by other power connection methods, and may rotate at the same speed or at different speeds. A driving shaft seal 412 is arranged at the joint of the driving shaft 405 and the linkage shaft 409; the drainage pump shell 401 includes the drainage pump shell end cover 401.2 of the drainage pump shell main casing 401.1 and the left end of half section on the right side in the figure, and drainage pump shell end cover passes through the screw fixation on the drainage pump shell main casing, drainage pump shell 401 right-hand member still is equipped with left inlet port 406, exit hole 407 and initiative shaft hole 408, inlet port 406 intercommunication feed liquor oral cavity, the height in feed liquor oral cavity is a little higher than the meshing height and with the axle core staggered arrangement in driven shaft chamber, exit hole 407 intercommunication feed liquor oral cavity, the height in feed liquor oral cavity be a little lower than the meshing height and with the axle core staggered arrangement in initiative shaft chamber, the axis of driven shaft 404 and the axis of driving shaft 405 form a vertical axis plane, inlet port 406 and exit hole 407 are located axis plane's front and back both sides respectively, initiative shaft hole 408 and driving shaft 405 are arranged with one heart. A drain pump inlet conduit 708 connects with the inlet port 406 and a drain pump outlet conduit 709 connects with the outlet port 407.
The working principle of the drainage pump 400 is as follows:
the drainage pump rotates together due to the rotation of the motor rotating shaft, and the drainage pump has good structural characteristic and sealing performance, and can quickly discharge air in the pump inlet into the pump body and then discharge the air out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, when the pump is started, because the suction cavity and the pump inlet of the pump body are the same as the atmospheric pressure, when the impeller rotates at high speed, the air in the suction cavity is discharged out of the pump outlet through the centrifugal force of the impeller, the suction cavity is at negative pressure, and the pump inlet is at the atmospheric pressure so as to be higher than the pressure of the suction cavity, the check valve at the inlet is opened, and simultaneously, the drainage pump also rotates together to introduce the air in the pump inlet into the suction cavity and discharge the air out of the pump outlet through the impeller, and the process is repeated; the inlet check valve is closed until the pressures of the suction cavity and the pump inlet are balanced, and due to the structural characteristics and good sealing property of the drainage pump, the rotation of the drainage pump enables the air at the pump inlet to be continuously discharged into the suction cavity through the drainage pump, and then the air is discharged out of the pump outlet through the impeller, so that the air in the suction cavity is infinitely exhausted in a repeated way; the liquid in the external storage tank is sucked into the suction cavity through the drainage pump, and then the liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force, enters the discharge pipeline from the pump outlet and is conveyed to a required place.
1. Thus, the problem that a certain amount of liquid must be added into the pump body to ensure self-suction capability is solved; 2. the problem that the liquid cannot be used at a height of more than 5 to 9 meters below the level of the centrifugal pump is solved;
3. the problem that the time for exhausting the air in the pump body and the inlet pipe is long is solved, and the exhausting can be generally completed within a few seconds.
Example 1
The inward opening type pressure relief valve body is a detachable inward opening type adjustable pressure relief valve 610;
the detachable inward-opening adjustable pressure relief valve 610 specifically comprises a valve body shell 611, an adjusting screw rod 612, a spring 613, a valve core 614, a lock nut 615 and a sealing ring 616, wherein the right end of the valve body shell 611 is provided with a pressure relief inlet 610.1, the right section of the top of the valve body shell 611 is provided with a pressure relief outlet 610.2, the left end of the valve body shell 611 is outwards provided with a valve body flange 611.1, the valve body flange 611.1 is connected with a pump shell 701.1 through a connecting bolt, the inner wall of the left section of the valve body shell 611 is provided with internal threads, the periphery of the adjusting screw rod 612 is provided with external threads, the adjusting screw rod 612 is screwed into the valve body shell 611 from left to right and is in threaded fit with the valve body shell 611, the left section of the adjusting screw rod 612 is positioned on the left outer side of the valve body shell 611, the right end of the adjusting screw rod 612 is connected with the spring 613, the right end of the spring 613 is connected with the valve core 614, the shape of the valve core 614 is matched with the inner cavity of the valve body shell 611, the sealing ring 616 is positioned on the outer ring of the right end of the adjusting screw rod 612, the lock nut 615 is screwed on the left section of the adjusting screw 612 and abuts against the outer wall of the left side of the valve body flange 611.1 so as to lock the position of the adjusting screw 612, and the expansion and contraction of the spring 613 are suitable for the return of a liquid with certain viscosity or a liquid under certain pressure.
Example 2
The inward opening type pressure relief valve body is an inward opening type adjustable pressure relief valve 620;
the difference between the inward opening type adjustable pressure relief valve 620 and the detachable inward opening type pressure relief valve 610 is that a valve body shell 611 does not exist, the inward opening type adjustable pressure relief valve 620 comprises a regulating screw rod 612, a spring 613, a valve core 614, a locking nut 615 and a sealing ring 616, the valve core 614 is a square valve core, an internal thread is arranged on the inner wall of the left section of a pump shell 701.1 at the installation position of the pressure relief valve body, an external thread is arranged on the periphery of the regulating screw rod 612, the regulating screw rod 612 is screwed into the installation position of the pressure relief valve body from left to right to be matched with the internal thread, the left section of the regulating screw rod 612 is positioned on the left side of the installation position of the pressure relief valve body, the right end of the regulating screw rod 612 is connected with the spring 613 to the right side, the right end of the spring 613 is connected with the valve core 614, the appearance of the valve core 614 is matched with the inner cavity of the installation position of the pressure relief valve body, the sealing ring 616 is positioned on the outer ring at the right end of the regulating screw rod 612, the locking nut 615 is screwed on the left section of the regulating screw rod 612 and abuts against the left side of the valve body flange 611.1, the expansion and contraction of the spring 613 is suitable for the return of a liquid with a certain viscosity or a liquid under a certain pressure.
Example 3
The inward opening type pressure relief valve body is an inward opening type adjustable spherical pressure relief valve 630;
embodiment 3 differs from embodiment 2 in that the spool 614 is a ball spool.
The working principle is as follows:
when the motor is started, the rotating shaft of the motor rotates to drive the impeller to rotate, and if air exists in the pump body, the air density is low, and the centrifugal force generated after the rotation is small, so that the low pressure formed in the central area of the impeller is not enough to suck the liquid in the external storage tank into the pump body; therefore, after a certain amount of liquid is added into the pump body, the motor power can drive the impeller to force the liquid among the impeller blades to rotate, the liquid is thrown from the center of the impeller to the periphery under the action of inertial centrifugal force and obtains energy, so that the static pressure of the liquid flowing to the periphery of the impeller is increased, the flow rate is increased, the liquid is decelerated due to the gradual expansion of a flow passage of the pump body after leaving the impeller and entering a pressing cavity in the pump body, most of kinetic energy is converted into the static pressure, and then the liquid with higher pressure enters a discharge pipeline from the pump outlet and is conveyed to a required place.
When the liquid is thrown from the center of the impeller to the periphery, a low-pressure area is generated in the center of the impeller, the pressure above the liquid level of the storage tank is greater than the pressure of the suction port of the pump, so that the check valve is automatically opened in one direction, the liquid is sucked into the center of the impeller, the liquid has self-sealing capacity in the pump body as long as the impeller rotates continuously, the liquid is loaded with air and is sent to the extrusion cavity together, air and the liquid are separated out in the bubble eliminator in the pump body, the air is discharged from the pump outlet, the liquid is remained in the extrusion cavity until the air in the pump inlet and the suction cavity is completely discharged through the pump outlet, the liquid is continuously sucked and discharged, and the liquid is continuously conveyed out.
When the pressure of the liquid exceeds the set pressure, the liquid pushes a valve core of the pressure relief valve body to compress a spring in the pressure relief valve body, and high-pressure liquid enters from a pressure relief inlet and then is discharged from a pressure relief outlet to enter into a suction cavity; the larger the pressure is, the larger the compression of the spring in the pressure relief valve body is, the larger the opening area of the valve core and the pressure relief outlet of the pressure relief valve body is, so that the larger the circulating area is, and the flow rate is increased therewith. When the pressure of the liquid is lower than the set pressure, the spring in the pressure relief valve body resets, the valve core of the pressure relief valve body is closed, and the liquid cannot enter the pressure relief outlet through the pressure relief inlet and is discharged to the suction cavity. The strength and the pressure of the spring can be adjusted by adjusting the adjusting screw rod, and the pressure of the valve core on the pressure relief inlet of the valve body can be adjusted, namely the pressure and the flow of pressure relief can be continuously adjusted. The locking nut locks the adjusting screw rod after the technological requirement of pressure relief is adjusted by the adjusting screw rod. The pressure relief valve body can be an independent device and is embedded on the pump body to control the pressure and flow of the pump, so that the aim of constant pressure output of the pump liquid is fulfilled.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (6)
1. A working method of a drainage type constant pressure self-priming pump with an internal open type pressure relief valve body is characterized in that the drainage type constant pressure self-priming pump with the internal open type pressure relief valve body comprises a pump body and a motor which are arranged on the left and the right, the pump body comprises a pump shell, an intake cavity, an impeller cavity, a pressing cavity and a pressure relief cavity are arranged in the pump shell, the lower half section of the right side of the pump shell is provided with a pump body flange, the left side of the pump body flange is the impeller cavity, an impeller is arranged in the impeller cavity, the intake cavity is positioned above the left side of the impeller cavity and communicated with the inlet at the left end of the impeller cavity, the pressing cavity is communicated with the top of the impeller cavity, the pressure relief cavity is communicated with the bottom of the impeller cavity, the pump shell at the left side of the intake cavity is provided with a pump inlet, an inlet check valve is arranged at the pump inlet, the pump outlet is arranged at the pump shell at the top of the pressing cavity, and the lower left corner of the intake cavity is provided with a liquid return port, the liquid return port is communicated up and down, the upper left corner of the pressure relief cavity is provided with a pressure relief port, the pressure relief port is communicated left and right, the liquid return port is positioned above the left side of the pressure relief port, a pressure relief valve body mounting position is formed in the region between the liquid return port and the pressure relief port, the pressure relief valve body mounting position at the lower left section of the pump shell is provided with an inward opening type pressure relief valve body, the inward opening type pressure relief valve body is provided with a pressure relief inlet and a pressure relief outlet, the pressure relief inlet is communicated with the pressure relief port, and the pressure relief outlet is communicated with the liquid return port; the motor comprises a motor main body, the bottom of the motor main body is connected with a pump base, a motor flange is arranged at the left end of the motor main body, the motor flange is fixedly connected with a pump body flange on the left side of the motor main body through a bolt, a motor rotating shaft extends leftwards from the motor main body and extends leftwards to the left of the motor flange, the motor rotating shaft sequentially penetrates through the pump body flange and the impeller leftwards, and the left end of the motor rotating shaft is fixedly connected with the left end face of the impeller through an impeller fixing screw; the middle part of the left end of the pump body is also provided with a drainage pump, a drainage pump inlet pipeline is arranged in the pump body outside the inlet check valve and is connected with the inlet of the drainage pump, a drainage pump outlet pipeline is arranged in the pump body inside the inlet check valve, the outlet of the drainage pump is connected with the drainage pump outlet pipeline, namely, the fluid entering from the pump inlet can be divided into two branches, one branch directly enters the suction cavity through the inlet check valve, and the other branch enters the suction cavity through the drainage pump inlet pipeline, the drainage pump and the drainage pump outlet pipeline; the specific working method comprises the following steps:
the drainage pump rotates together due to the rotation of the motor rotating shaft, air in the pump inlet is rapidly discharged into the pump body and then discharged out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, when the pump is just started, because the suction cavity and the pump inlet of the pump body are the same as the atmospheric pressure, when the impeller rotates at a high speed, the air in the suction cavity is discharged out of the pump outlet through the centrifugal force of the impeller, at the moment, the suction cavity is negative pressure, the pressure of the pump inlet is atmospheric pressure and is larger than the pressure of the suction cavity, so that the inlet check valve is opened, meanwhile, the drainage pump also rotates together, simultaneously, the air in the pump inlet is introduced into the suction cavity, and then the air is discharged out of the pump outlet through the impeller, and the process is repeated; until the pressures of the suction cavity and the pump inlet are balanced, the inlet check valve is closed, the rotation of the drainage pump enables the air at the pump inlet to be continuously discharged into the suction cavity through the drainage pump, and then the impeller discharges the air out of the pump outlet, so that the air in the suction cavity is infinitely exhausted in a circulating manner; the liquid in the external storage tank is sucked into the suction cavity through the drainage pump, and then the liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force, enters the discharge pipeline from the pump outlet and is conveyed to a required place.
2. The working method of the drainage type constant pressure self-priming pump with the internal open pressure relief valve body as claimed in claim 1, wherein the drainage pump comprises a drainage pump housing, a driven gear and a driving gear are arranged in the drainage pump housing, the driven gear and the driving gear are meshed with each other, the height of the mutual meshing is called as the meshing height, the driven gear passes through a transverse driven shaft, the driving gear passes through a transverse driving shaft, the left end and the right end of the driven shaft are mounted in a driven shaft cavity of the upper half section in the drainage pump housing through bearings, the inner diameter of the driven shaft cavity is matched with the size of the driven gear, the left end and the right end of the driving shaft are mounted in a driving shaft cavity of the lower half section in the drainage pump housing through bearings, the inner diameter of the driving shaft cavity is matched with the size of the driving gear, the right end of the driving shaft penetrates out of the drainage pump housing and is connected with the rotating shaft of the motor through a linkage shaft, a driving shaft seal is arranged at the joint of the driving shaft and the linkage shaft; the drainage pump shell comprises a drainage pump shell main shell body at the right half section and a drainage pump shell end cover at the left end, the drainage pump shell end cover is fixed on the drainage pump shell main shell body through screws, the right end of the drainage pump shell is also provided with a left inlet hole, a left outlet hole and a driving shaft hole, the inlet hole is communicated with a liquid inlet cavity, the height of the liquid inlet cavity is slightly higher than the meshing height and is arranged in a staggered way with the shaft core of the driven shaft cavity, the outlet hole is communicated with the liquid outlet cavity, the height of the liquid outlet cavity is slightly lower than the meshing height and is arranged in a staggered way with the shaft core of the driving shaft cavity, the axis of the driven shaft and the axis of the driving shaft form a vertical axis plane, the inlet hole and the outlet hole are respectively positioned at the front side and the rear side of the axis plane, the driving shaft hole and the driving shaft are arranged concentrically, an inlet pipeline of the drainage pump is connected with the inlet hole, and an outlet pipeline of the drainage pump is connected with the outlet hole.
3. The method of claim 1, wherein the pump body and the motor are mounted together on a pump base.
4. The drainage type constant pressure self-priming pump with the internal open type pressure relief valve body as claimed in claim 1, wherein a foam breaker is disposed in the pressure outlet cavity right below the pump outlet, and a buffer cavity is disposed right below the foam breaker.
5. The working method of the drainage type constant pressure self-priming pump with the internal open type pressure relief valve body according to claim 1, wherein a filling opening is further arranged on the pump shell at the top of the extrusion cavity, the filling opening is positioned at the upper left of the extrusion cavity, and a filling opening bolt is arranged at the filling opening.
6. The operation method of the drainage type constant pressure self-priming pump with the internal open type pressure relief valve body as claimed in claim 1, wherein a tapping hole is provided on the pump housing at the left end of the pressure relief chamber, and a tapping hole bolt is provided at the tapping hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111671432.1A CN114294242B (en) | 2021-12-31 | 2021-12-31 | Working method of drainage type constant-pressure self-priming pump with internal opening pressure relief valve body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111671432.1A CN114294242B (en) | 2021-12-31 | 2021-12-31 | Working method of drainage type constant-pressure self-priming pump with internal opening pressure relief valve body |
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| CN114294242A true CN114294242A (en) | 2022-04-08 |
| CN114294242B CN114294242B (en) | 2023-06-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117366021A (en) * | 2023-11-20 | 2024-01-09 | 东营市胜凯石化设备有限公司 | Energy-saving circulating water pump for recycling waste steam from petroleum refining |
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| CN206268088U (en) * | 2016-11-30 | 2017-06-20 | 常德金鹏印务有限公司 | A kind of high-temperature water self priming pump |
| CN107806418A (en) * | 2016-09-08 | 2018-03-16 | 沈阳鼓风机集团申蓝机械有限公司 | Marine vertical internal-mixing self priming pump |
| CN109340125A (en) * | 2018-08-21 | 2019-02-15 | 上海瑞邦机械集团有限公司 | A kind of self priming pump of leakproof and Quick air-discharge |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000045979A (en) * | 1998-07-27 | 2000-02-15 | Sanko Pump Seisakusho:Kk | Suction sand pump |
| CN204003486U (en) * | 2014-07-04 | 2014-12-10 | 北京中创天成科技发展有限公司 | A kind of TC Novel series slag stock pump |
| CN105422466A (en) * | 2015-12-31 | 2016-03-23 | 镇江江大泵业科技有限公司 | Interlink-type multi-surface centrifugal seal self-sucking pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117366021A (en) * | 2023-11-20 | 2024-01-09 | 东营市胜凯石化设备有限公司 | Energy-saving circulating water pump for recycling waste steam from petroleum refining |
| CN117366021B (en) * | 2023-11-20 | 2024-03-26 | 东营市胜凯石化设备有限公司 | Energy-saving circulating water pump for recycling waste steam from petroleum refining |
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|---|---|
| CN114294242B (en) | 2023-06-06 |
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