CN114294240B - Working method of drainage type constant-pressure self-priming pump with external open pressure relief valve body - Google Patents

Abstract

The invention relates to a working method of a drainage constant-pressure self-priming pump with an external open pressure relief valve body, wherein the drainage pump rotates together due to the rotation of a motor rotating shaft, and the suction cavity of a pump body is the same with the inlet of the pump in atmospheric pressure, so that the impeller rotates at a high speed, and the circulation is continuously and infinitely close to exhausting the air in the suction cavity; liquid in the external storage tank is pumped into the suction cavity through the drainage pump, and then liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force and pumped out of the pump to enter the discharge pipeline and is conveyed to a required place. The invention can be suitable for conveying low-temperature high-viscosity liquid and high-temperature low-viscosity liquid, and the motor can stably operate and output pressure is stable.

Description

Working method of drainage type constant-pressure self-priming pump with external open pressure relief valve body

Technical Field

The invention relates to a working method of a drainage type constant-pressure self-priming pump with an external open pressure relief valve body.

Background

And (3) a pump: is a machine for transporting liquid.

The pump is divided into the following components according to the working principle: power pumps (impeller type), positive displacement pumps (positive displacement type), other types of pumps. The dynamic pump (impeller type) is a pump that uses an impeller that rotates at a high speed, and that delivers liquid by applying work to the liquid by means of blades, such as a centrifugal pump, a peripheral pump, a mixed flow pump, an axial flow pump, and the like. The method is divided into the following modes of impeller suction: single suction pumps and multiple suction pumps; the number of the impellers is divided into: single stage pumps and multistage pumps; the pump is divided according to the position of a pump shaft: horizontal pump, vertical pump, etc.; the pump is divided into a plurality of modes according to the installation height and the working mode of the pump: self-priming centrifugal pumps and suction centrifugal pumps.

Centrifugal pump characteristics: 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 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 capability, overcomes the defect that the common suction centrifugal pump has no self-priming capability, and can meet the requirements of various industries on self-priming delivery of fluid below the pump level. In the process of delivering large flow of liquid, the self-priming 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 operation, a self-priming centrifugal pump cannot be used particularly for some liquids having a viscosity, and the viscosity of the liquid greatly changes with a change in temperature, particularly when the liquid is transported at a low temperature (the viscosity of the liquid increases at a low temperature) and some liquids having a viscosity.

The reasons are as follows:

1. because the centrifugal pump is required to have a larger suction force and an impeller to obtain a larger inertial centrifugal force when the centrifugal pump is used for accommodating low temperature and liquid with a certain viscosity; meanwhile, the shaft power is increased, and the power of the motor is increased to make up for the conditions that the self-priming centrifugal pump is used for conveying low-temperature liquid with certain viscosity to operate; therefore, a certain flow speed and flow rate can be achieved, and the output liquid pressure is met. Particularly in low-temperature viscosity liquids, the output liquid pressure is high due to poor liquid fluidity, so that the shaft power is increased, and the motor may be overloaded and burnt.

2. Because the proportion of the mixture of air and liquid is different when the pump is just started, the load force of the impeller is also different, thus the unbalance of the output pressure is caused, the shaft power of the motor is unbalanced, the operation of the motor is unstable, and the service lives of the impeller and the motor are greatly shortened.

3. When the shaft power is increased, the self-priming pump is used for conveying high-temperature liquid, namely when the viscosity of the liquid is greatly changed into low-viscosity liquid along with the change of temperature, the self-priming pump is used for conveying the liquid to reach a certain flow speed and flow rate, and the liquid has low viscosity, good fluidity and low conveying liquid pressure. Therefore, the pressure difference between low-temperature liquid with certain viscosity and high-temperature low-viscosity liquid conveyed by the self-priming centrifugal pump is relatively large, and the self-priming centrifugal pump cannot automatically adjust the output pressure, so that the pressure value of the output liquid cannot be kept to always meet the working condition requirement, and the equipment system is unstable.

4. In practical operation, particularly for some liquids with viscosity, and the viscosity of the liquid changes greatly with the change of temperature, particularly for low temperature delivery and some viscosity liquids, the self-priming centrifugal pump is influenced by the characteristics of the liquid (the pump is operated by the rotation shaft of the motor to drive the impeller on the rotation shaft to rotate, if no liquid is in the pump, only air is used, and the centrifugal force generated after the rotation is small due to the low air density, so that the low pressure formed in the central area of the impeller is insufficient to suck the liquid in the external storage tank into the pump; therefore, after a certain amount of liquid is added into the pump body, the pump shaft drives the impeller to rotate together after the pump body is started, the liquid between the blades is forced to rotate, the liquid is thrown to the periphery from the center of the impeller under the action of inertia centrifugal force, the static pressure of the liquid flowing to the periphery of the impeller is increased, the flow rate is increased, the liquid leaves the impeller and enters an extrusion cavity in the pump body, the liquid is decelerated due to gradual expansion of a flow passage of the pump body, most of kinetic energy is converted into static pressure, and then the liquid with higher pressure enters a discharge pipeline from a discharge port of the pump and is conveyed to a required place.

Therefore, the working method of the drainage type constant-pressure self-priming pump with the external open pressure relief valve body, which can be suitable for conveying low-temperature high-viscosity liquid and high-temperature low-viscosity liquid, is particularly important, and the motor stably runs and the output pressure is stable.

Disclosure of Invention

The invention aims to overcome the defects and provide the working method of the drainage type constant-pressure self-priming pump with the external open pressure relief valve body, which can be suitable for conveying low-temperature high-viscosity liquid and high-temperature low-viscosity liquid, and can ensure that a motor stably operates and output pressure is stable, so that the system has high operation reliability, constant pressure, difficult damage and stable operation.

The purpose of the invention is realized in the following way:

the working method of the drainage type constant-pressure self-priming pump with the external opening pressure relief valve body is characterized by comprising a pump body and a motor, wherein the pump body and the motor are jointly arranged on a pump base, the pump body and the motor are arranged left and right, the pump body comprises a pump shell, the bottom of the pump shell is connected with the pump base, a suction cavity, an impeller cavity, an extrusion cavity and a pressure relief cavity are arranged in the pump shell, the motor comprises a motor main body, the bottom of the motor main body is connected with the pump base, the left end of the motor main body is provided with a motor flange plate, the motor flange plate is fixedly connected with the pump flange plate on the left side of the motor main body through bolts, the motor main body extends out leftwards and extends leftwards to the left side of the motor flange plate, the motor shaft also sequentially passes through the pump flange plate and an impeller, the left end of the motor shaft is fixedly connected with the left end face of the impeller through an impeller fixing screw, a drainage pump inlet pipeline is further arranged in the middle part of the left end of the pump body, the pump inlet pipeline is connected with the inlet of the drainage pump, the drainage pipeline is arranged in the inner side of the pump main body, the inlet pipeline of the inlet check valve is internally provided with the pump inlet pipeline, the drainage pipeline is further connected with the inlet of the drainage pump through the drainage pipeline, and the drainage pipeline can directly enters the inlet and the drainage pump through the inlet pipeline and the drainage pipeline of the drainage pump through the inlet and the inlet pipeline; the specific working method is as follows:

the air in the pump inlet is quickly discharged into the pump body due to the rotation of the motor rotating shaft and then is discharged out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, and 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 due to the fact that the suction cavity of the pump body is the same as the air pressure of the pump inlet, the suction cavity is negative pressure, the pump inlet is at the atmospheric pressure and is higher than the pressure of the suction cavity, so that the inlet check valve is opened, the drainage pump rotates together at the same time, the air in the pump inlet is introduced into the suction cavity together, and the air is discharged out of the pump outlet through the impeller, so that the operation is repeated; when the pressure of the suction cavity and the pressure of the pump inlet are balanced, the inlet check valve is closed, the air at the pump inlet is continuously discharged into the suction cavity through the drainage pump by the rotation of the drainage pump, and then the air is discharged out of the pump by the impeller, so that the air in the suction cavity is repeatedly and infinitely nearly exhausted; liquid in the external storage tank is pumped into the suction cavity through the drainage pump, and then liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force and pumped out of the pump to enter the discharge pipeline and is conveyed to a required place.

Preferably, the drainage pump comprises a drainage pump shell, wherein 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 meshed height is called as the meshed 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 drainage pump shell 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 motor rotating shaft through a coupling shaft, and a driving shaft is sealed at the joint of the driving shaft and the coupling shaft; the drainage pump shell comprises a drainage pump shell main shell body of a right half section and a drainage pump shell end cover of a left end, the drainage pump shell end cover is fixed on the drainage pump shell main shell body through screws, a left inlet hole, an outlet hole and a driving shaft hole are further formed in the right end of the drainage pump shell, 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 staggered with the shaft core of a driven shaft cavity, the outlet hole is communicated with a liquid outlet cavity, the height of the liquid outlet cavity is slightly lower than the meshing height and is staggered with the shaft core of the driving shaft cavity, a vertical axis plane is formed between the axis of the driven shaft and the axis of the driving shaft, the inlet hole and the outlet hole are respectively located on the front side and the rear side of the axis plane, and the driving shaft hole and the driving shaft are concentrically arranged. The drainage pump inlet pipeline is connected with the inlet hole, and the drainage pump outlet pipeline is connected with the outlet hole.

As a preference, the lower right half section of the pump housing is provided with a pump body flange, the left side of the pump body flange is an impeller cavity, an impeller is arranged in the impeller cavity, the suction cavity is positioned at the left upper side of the impeller cavity and is communicated with the left end inlet of the impeller cavity, the extrusion 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 housing at the left side of the suction cavity is provided with a pump inlet, the pump inlet is provided with an inlet check valve, the pump housing at the top of the extrusion cavity is provided with a pump outlet, the bottom of the suction cavity is provided with a liquid return port left and right, the left end of the pressure relief cavity is provided with a pressure relief opening upwards, the pressure relief opening is communicated up and down, the liquid return port is positioned at the right upper side of the pressure relief opening, a pressure relief valve body installation position is communicated to the left end face of the pump housing, an outward opening pressure relief valve body is arranged in the pressure relief valve installation position, the outward opening pressure relief valve body is provided with a pressure relief inlet and a pressure relief outlet, the pressure relief inlet is communicated with the liquid return port.

Preferably, the outward opening type pressure relief valve body is a detachable outward opening type adjustable pressure relief valve;

the detachable outward-opening type adjustable pressure release valve specifically comprises a valve body shell, an adjusting screw rod, a spring, a valve core, a connecting rod, a locking nut, a clamp spring, a spring pressing plate, a choke plug screw and a fixing pin, wherein a pressure release inlet is arranged at the right half section of the bottom of the valve body shell, a pressure release outlet is arranged at the right end of the valve body shell, a circle of valve core bayonet is convexly arranged on the inner wall of the valve body shell at the left side of the pressure release outlet, a valve body flange is outwards arranged at the left end of the valve body shell and connected with a pump shell through a connecting bolt, an internal thread is arranged on the inner wall of the left section of the valve body shell, an external thread is arranged on the periphery of the adjusting screw rod, the adjusting screw rod is screwed into the valve body shell from left to right and is in threaded fit with the valve body shell, the left section of the adjusting screw rod is in a hollow structure which is penetrated from left to right, a transverse spring is arranged in the right section of the adjusting screw rod, the connecting rod is arranged in the spring in a penetrating way, the right end of the connecting rod is connected with the valve core, the appearance of the valve core is matched with the inner cavity of the valve body shell, the valve core is positioned on the right side of the valve core bayonet and can be limited by the valve core bayonet, a circle of clamp spring limiting groove is formed in the inner wall of the right end of the adjusting screw rod in an inward concave way, the clamp spring is arranged in the clamp spring limiting groove, the right end of the spring is in contact connection with the clamp spring, the left end of the connecting rod is sleeved with the spring pressing plate, the right side of the spring pressing plate is in contact connection with the left end of the spring, the end part of the connecting rod on the left side of the spring pressing plate is provided with a fixing pin, the outer ring on the right end of the adjusting screw rod is provided with a first sealing ring, the left end of the adjusting screw rod is screwed into a choke plug screw, a second sealing ring is arranged between the adjusting screw rod and the choke plug screw, and the locking nut is arranged on the left section of the adjusting screw rod in a rotating way and is tightly abutted against the left outer wall of the flange of the valve body to lock the position of the adjusting screw rod.

Preferably, the outward opening type pressure relief valve body is an outward opening type adjustable pressure relief valve;

the outer-opening type adjustable pressure relief valve is characterized in that a valve body shell does not exist, the outer-opening type adjustable pressure relief valve comprises a valve body shell, an adjusting screw rod, a spring, a valve core, a connecting rod, a locking nut, a clamp spring, a spring pressing plate, a choke plug screw and a fixing pin, an inner thread is arranged on the inner wall of the left section of a pump shell at the installation position of the pressure relief valve body, the periphery of the adjusting screw rod is provided with an outer thread, the adjusting screw rod is screwed into the installation position of the pressure relief valve body from left to right to be matched with the inner thread, the left section of the adjusting screw rod is positioned on the left outer side of the installation position of the pressure relief valve body, the inner cavity wall of the pressure relief valve body is provided with a circle of valve core bayonet, the left end of the clamp spring is in protruding connection with a circle of the valve core, the adjusting screw rod is in a hollow structure penetrating from left to right, a connecting rod is penetrated in the right section of the adjusting screw rod, the appearance of the valve core is matched with the inner cavity of the installation position of the pressure relief valve body, the valve core is positioned on the right side of the valve core and can be limited by the valve core bayonet, the inner wall of the right end of the adjusting screw rod is concavely provided with a circle of limiting groove, the clamp spring is arranged in the left side of the installation position of the pressure relief valve body, the right end is in contact with the left end of the connecting rod, and the sealing ring is tightly connected with the left end of the sealing plate, and the sealing ring is tightly connected with the left end of the sealing ring.

Compared with the prior art, the invention has the beneficial effects that:

according to the self-priming pump, the out-of-band opening type pressure relief valve body is adopted, so that liquid initially entering the impeller cavity of the self-priming pump can return to the suction cavity through the out-of-band opening type pressure relief valve body, the impeller cavity of the self-priming pump is filled with liquid rapidly, the idle running of the impeller is avoided, the conveying capacity of the impeller is improved, and the self-priming pump is suitable for conveying liquid which cannot be viscosity by adjusting the adjusting screw rod of the out-of-band opening type pressure relief valve body. The invention has the advantages of being capable of adapting to the low-temperature high-viscosity liquid delivery, adapting to the high-temperature low-viscosity liquid delivery, stably operating the motor and stably outputting pressure.

Drawings

Fig. 1 is a schematic structural diagram of a drainage type constant pressure self-priming pump with an external open pressure relief valve body in embodiment 1.

Fig. 2 is a schematic view of a detachable outward opening type adjustable relief valve of 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 diagram of a drainage type constant pressure self-priming pump with an external open pressure relief valve body in embodiment 2.

Fig. 6 is a schematic view of a detachable outward opening type adjustable relief valve of 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 drainage 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 housing 401, the drainage pump housing main housing 401.1, the drainage pump housing end cap 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 drainage constant pressure self-priming pump 700 with external opening pressure relief valve body, pump body 701, pump housing 701.1, suction cavity 701.2, impeller cavity 701.3, extrusion cavity 701.4, pressure relief cavity 701.5, pump body flange 701.6, impeller 701.7, pump inlet 701.8, inlet check valve 701.9, pump outlet 701.10, defoamer 701.11, filling port 701.12, filling port bolt 701.13, drain port 701.14, drain port bolt 701.15, return port 701.16, pressure relief port 701.17, buffer cavity 701.18, motor 702, motor body 702.1, motor flange 702.2, motor rotation shaft 702.3, impeller set screw 702.4, pump base 703

Detachable outward-opening pressure relief valve body 640, valve body shell 641, adjusting screw 642, spring 643, valve core 644, connecting rod 645, lock nut 646, snap spring 647, spring pressing plate 648 and choke plug screw 649

An outward opening adjustable relief valve 650.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to the drawings, the invention relates to a drainage constant pressure self-priming pump 700 with an external 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 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, an extrusion cavity 701.4 and a pressure relief cavity 701.5 are arranged in the pump housing 701.1, a pump body flange 701.6 is arranged on the lower right half of the pump housing 701.1, the impeller cavity 701.3 is arranged on the left side of the pump body flange 701.6, an impeller 701.7 is arranged in the impeller cavity 701.3, the suction cavity 701.2 is positioned on the left upper side of the impeller cavity 701.3 and is communicated with the left inlet of the impeller cavity 701.3, the extrusion 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 impeller cavity 701.3, the pump inlet 701.8 is arranged on the pump housing 701.1 on the left side of the suction cavity 701.2, an inlet check valve 701.9 is arranged at the position of the pump inlet 701.8, a pump outlet 701.10 is arranged on the pump housing 701.1 at the top of the extrusion cavity 701.4, a foam breaker 701.11 is arranged at the position of the pump housing 701.4 at the position right below the pump outlet 701.10, a buffer cavity 701.18 is arranged right below the foam breaker 701.11, a liquid adding port 701.12 is also arranged on the pump housing 701.1 at the top of the extrusion cavity 701.4, the liquid adding port 701.12 is positioned at the upper left side of the extrusion cavity 701.4, a liquid adding port bolt 701.13 is arranged at the position of the liquid adding port 701.12, a liquid discharging port 701.14 is arranged on the pump housing 701.1 at the left end of the pressure releasing cavity 701.5, a liquid discharging port bolt 701.15 is arranged at the position of the liquid discharging port 701.14, a liquid returning port 701.16 is arranged at the left side of the bottom of the suction cavity 701.2, a pressure releasing port 701.17 is arranged at the left end of the pressure releasing cavity 701.5, the pressure releasing port 701.17 is communicated up and down, the pressure releasing port 701.17 is positioned at the upper right side of the pressure releasing port 701.17, a pressure releasing area between the pressure releasing port 701.17 and the pressure releasing area is formed by a valve body, the pressure release valve body installation position communicates to the left end face of the pump housing 701.1, and an outward opening pressure release valve body is arranged in the pressure release valve body installation position, and the outward opening pressure release valve body is provided with a pressure release inlet 610.1 and a pressure release outlet 610.2, and the pressure release inlet 610.1 communicates with the pressure release opening 701.17, and the pressure release outlet 610.2 communicates with the liquid return opening 701.16.

The motor 702 comprises a motor main body 702.1, a pump base 703 is connected to the bottom of the motor main body 702.1, a motor flange 702.2 is arranged at the left end of the motor main body 702.1, the motor flange 702.2 is fixedly connected with a pump body flange 701.6 at the left side of the motor flange 702.2 through bolts, a motor rotating shaft 702.3 extends leftwards from the motor main body 702.1, a motor rotating shaft 702.3 extends leftwards from the motor flange 702.2, a motor rotating shaft 702.3 also sequentially penetrates through the pump body flange 701.6 and the impeller 701.4 leftwards, and the left end of the motor rotating shaft 702.3 is fixedly connected with the left end face of the impeller 701.7 through an impeller fixing screw 702.4.

The middle part of the left end of the pump body 701 is further provided with a drainage pump 400, a drainage pump inlet pipeline 708 is arranged in the pump body 701 outside the inlet check valve 701.9, the drainage pump inlet pipeline 708 is connected with the inlet of the drainage pump 400, a drainage pump outlet pipeline 709 is arranged in the pump body 701 inside the inlet check valve 701.9, the outlet of the drainage pump 400 is connected with the drainage pump outlet pipeline 709, that is, fluid entering from the pump inlet 701.8 can be split into two branches, one branch directly enters the suction cavity 701.2 through the inlet check valve 701.9, and the other branch directly enters the suction cavity 701.2 through the drainage pump inlet pipeline 708, the drainage pump 400 and the drainage pump outlet pipeline 709.

The drainage pump 400 comprises a drainage pump housing 401, a driven gear 402 and a driving gear 403 which are arranged up and down are arranged in the drainage pump housing 401, the driven gear 402 and the driving gear 403 are meshed with each other, the meshed height is called as the meshed 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 housing 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 housing 401 through bearings, the inner diameter of the driving shaft cavity 411 is matched with the size of the driving gear 403, the right end of the driving shaft 405 passes out of the drainage pump housing 401 and is in power connection with a motor rotating shaft 702.3 through a linkage shaft 409, and the motor rotating shaft 702.3 can be rotated at the same speed or in a differential mode through other power connection modes. A driving shaft seal 412 is arranged at the joint of the driving shaft 405 and the linkage shaft 409; the drainage pump housing 401 is shown to include drainage pump housing body 401.1 of right half section and drainage pump housing end cover 401.2 of left end, and drainage pump housing end cover passes through the screw fixation and is on drainage pump housing body, drainage pump housing 401 right-hand member still is equipped with left import hole 406, exit port 407 and initiative shaft hole 408, import hole 406 intercommunication inlet cavity, the height in inlet cavity is slightly higher than the meshing height and with the axle core dislocation of driven shaft cavity, exit port 407 intercommunication outlet cavity, the height in outlet cavity is slightly lower than the meshing height and with the axle core dislocation of driving shaft cavity, the axis of driven shaft 404 forms a vertical axis plane with the axis of driving shaft 405, import hole 406 and exit port 407 are located the front and back both sides of axis plane respectively, initiative shaft hole 408 and driving shaft 405 concentric arrangement. A drain pump inlet conduit 708 is connected to the inlet aperture 406 and a drain pump outlet conduit 709 is connected to the outlet aperture 407.

The operation principle of the drainage pump 400 is as follows:

the drainage pump rotates together due to the rotation of the motor rotating shaft, the air in the pump inlet is rapidly discharged into the pump body due to the structural characteristics and good sealing performance of the drainage pump, and then is discharged out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, and 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 because the suction cavity of the pump body is the same with the atmospheric pressure, and the suction cavity is negative pressure, and the pump inlet is at atmospheric pressure and is higher than the suction cavity pressure, so that the inlet check valve is opened, and meanwhile, the drainage pump rotates together, simultaneously, the air in the pump inlet is introduced into the suction cavity, and the air is discharged out of the pump outlet through the impeller, so that the cycle is repeated; when the pressure of the suction cavity and the pressure of the pump inlet are balanced, the inlet check valve is closed, and 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 due to the structural characteristics and good sealing property of the drainage pump, and then the impeller discharges the air outside the pump, so that the air in the suction cavity is repeatedly and infinitely nearly discharged; liquid in the external storage tank is pumped into the suction cavity through the drainage pump, and then liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force and pumped out of the pump to enter the discharge pipeline and is conveyed to a required place.

1. Thus, the problem that a certain amount of liquid needs to be added into the pump body to realize self-priming capability is solved; 2. solves the problem that the liquid cannot be used at a height of 5 to 9 meters below the pump level;

3. solves the problem that the air in the pump body and the inlet pipe needs to be removed for a long time, and can be completed in a few seconds.

Example 1

The outward opening type pressure relief valve body is a detachable outward opening type adjustable pressure relief valve 640;

the detachable outward opening type adjustable pressure release valve 640 specifically comprises a valve body shell 641, an adjusting screw rod 642, a spring 643, a valve core 644, a connecting rod 645, a lock nut 646, a clamp spring 647, a spring pressing plate 648, a choke plug screw 649 and a fixing pin, wherein a pressure release inlet 610.1 is arranged at the right half section of the bottom of the valve body shell 641, a pressure release outlet 610.2 is arranged at the right end of the valve body shell 641, a circle of valve core bayonet is convexly arranged at the inner wall of the valve body shell 641 at the left side of the pressure release outlet 610.2, a valve body flange 641.1 is arranged at the left end of the valve body shell 641, the valve body flange 641.1 is connected with a pump shell 701.1 through a connecting bolt, an internal thread is arranged at the inner wall of the left section of the valve body shell 641, an external thread is arranged at the periphery of the adjusting screw rod 642, the adjusting screw rod 642 is screwed into the valve body shell 641 from left to right, the left section of the adjusting screw rod 642 is positioned at the left outer side of the valve body shell 641, the adjusting screw 642 is of a hollow structure which is penetrated left and right, a transverse spring 643 is arranged in the right section of the adjusting screw 642, a connecting rod 645 is penetrated in the spring 643, the right end of the connecting rod 645 is connected with a valve core 644, the appearance of the valve core 644 is matched with the inner cavity of the valve body shell 641, the valve core 644 is positioned on the right side of the valve core bayonet and can be limited by the valve core bayonet, a circle of snap spring limiting groove is concavely arranged on the inner wall of the right end of the adjusting screw 642, a snap spring 647 is arranged in the snap spring limiting groove, the right end of the spring 643 is in contact connection with the snap spring 647, a spring pressing plate 648 is sleeved on the left end of the connecting rod 645, the right side of the spring pressing plate 648 is in contact connection with the left end of the spring 643, the end of the connecting rod 645 on the left side of the spring pressing plate 648 is provided with a fixing pin, the outer ring on the right end of the adjusting screw 642 is provided with a first sealing ring, the left end of the adjusting screw 642 is screwed into a choke screw 649, a second sealing ring is arranged between the adjusting screw 642 and the choke screw 649, the lock nut 646 is screwed on the left section of the adjusting screw 642 and abuts against the left outer wall of the valve body flange 641.1 to lock the position of the adjusting screw 642, and the expansion and contraction of the spring 643 is suitable for liquid return of a certain viscosity liquid or a certain pressure liquid.

Example 2

The outward opening type pressure relief valve body is an outward opening type adjustable pressure relief valve 650;

the difference between the outward opening type adjustable relief valve 650 and the detachable outward opening type relief valve 640 is that there is no valve body shell 641, the outward opening type adjustable relief valve 650 comprises a valve body shell 641, an adjusting screw rod 642, a spring 643, a valve core 644, a connecting rod 645, a lock nut 646, a clamp spring 647, a spring pressing plate 648, a choke plug screw 649 and a fixing pin, an inner thread is arranged on the left section inner wall of the pump housing 701.1 at the installation position of the relief valve body, an outer thread is arranged on the periphery of the adjusting screw rod 642, the adjusting screw rod 642 is screwed into the installation position of the relief valve body from left to right to be matched with the inner thread, the left section of the adjusting screw rod 642 is positioned on the left outer side of the installation position of the relief valve body, a circle of valve core bayonet is convexly arranged on the inner cavity wall of the installation position of the relief valve body at the left side of the relief outlet 610.2, the adjusting screw rod 642 is a hollow structure which is penetrated from left to right, a transverse spring 643 is arranged in the right section of the adjusting screw rod 642, a connecting rod 645 is arranged in the spring 643 in a penetrating way, the right end of the connecting rod 645 is connected with a valve core 644, the appearance of the valve core 644 is matched with the inner cavity of the installation position of the pressure relief valve body, the valve core 644 is positioned on the right side of the valve core bayonet and can be limited by the valve core bayonet, a circle of snap spring limiting groove is concavely arranged on the inner wall of the right end of the adjusting screw rod 642, a snap spring 647 is arranged in the snap spring limiting groove, the right end of the spring 643 is in contact connection with the snap spring 647, the left end of the connecting rod 645 is sleeved with a spring pressing plate 648, the right side of the spring pressing plate 648 is in contact connection with the left end of the spring 643, the end of the connecting rod 645 on the left side of the spring pressing plate 645 is provided with a fixing pin, the outer ring on the right end of the adjusting screw rod 642 is provided with a first sealing ring, the left end of the adjusting screw rod 642 is screwed into a choke screw 649, a second sealing ring is arranged between the adjusting screw rod 642 and the choke screw 649, the lock nut 646 is screwed on the left section of the adjusting screw 642 and abuts against the left outer wall of the installation position of the pressure relief valve body, so that the position of the adjusting screw 642 is locked, and the expansion and contraction of the spring 643 are suitable for liquid return of a certain viscosity liquid or a certain pressure liquid.

Working principle:

when the motor is started, the motor rotating shaft rotates to drive the impeller to rotate, if air exists in the pump body, the air density is low, and the centrifugal force generated after rotation is small, so that the low pressure formed in the central area of the impeller is insufficient 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 between the impeller blades to rotate, the liquid is thrown to the periphery from the center of the impeller under the action of inertia centrifugal force and obtains energy, the static pressure of the liquid flowing to the periphery of the impeller is increased, the flow speed is increased, the liquid leaves the impeller and enters an extrusion cavity in the pump body, the liquid is decelerated due to gradual expansion of a flow passage of the pump body, most of kinetic energy is converted into static pressure, and then the liquid with higher pressure enters a discharge pipeline from the pump 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 larger than the pressure of the pump inlet, so that the check valve is automatically opened unidirectionally, the liquid is sucked into the center of the impeller, so that the liquid has self-sealing capacity in the pump body as long as the impeller continuously rotates, the liquid is loaded with air and is sent to the extrusion cavity together with the air, the air and the liquid are separated in the defoamer in the pump body, the air is discharged at the outlet of the pump, and the liquid stays in the extrusion cavity until the air of the pump inlet and the suction cavity is completely discharged through the pump, so that the liquid is continuously sucked and discharged and is continuously conveyed out.

Liquid at the periphery of the impeller can enter the liquid discharge cavity when being discharged from the impeller to the extrusion cavity, when the pressure of the liquid exceeds the set pressure, the liquid pushes the valve core of the pressure relief valve body, the spring in the pressure relief valve body is compressed, and high-pressure liquid enters from the pressure relief inlet and then is discharged from the pressure relief outlet to enter the suction cavity; the greater the pressure, the greater the compression of the spring inside the pressure relief valve body, the greater the opening area of the valve core and the pressure relief outlet of the pressure relief valve body, and the greater the flow area, the greater the flow quantity. When the pressure of the liquid is lower than the set pressure, the spring in the pressure relief valve body is reset, the valve core of the pressure relief valve body is closed, and the liquid can not enter the pressure relief outlet through the pressure relief inlet and be 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 release inlet of the valve body can be adjusted, namely the pressure and the flow of pressure release can be continuously adjusted. The locking nut locks the adjusting screw rod after the pressure relief adjusting process of the adjusting screw rod is required. 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 purpose of outputting constant pressure by the liquid of the pump is achieved.

The foregoing is merely a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the invention.

Claims (3)

1. The working method of the drainage type constant-pressure self-priming pump with the external opening pressure relief valve body is characterized in that the drainage type constant-pressure self-priming pump with the external opening pressure relief valve body comprises a pump body and a motor, the pump body and the motor are jointly installed on a pump base, the pump body and the motor are arranged left and right, the pump body comprises a pump shell, the bottom of the pump shell is connected with the pump base, a suction cavity, an impeller cavity, an extrusion cavity and a pressure relief cavity are arranged in the pump shell, the motor comprises a motor main body, the bottom of the motor main body is connected with the pump base, the left end of the motor main body is provided with a motor flange plate, the motor flange plate is fixedly connected with the pump body flange plate on the left side of the motor main body through bolts, a motor rotating shaft extends leftwards to the left side of the motor flange plate, the motor rotating shaft also sequentially penetrates through the pump flange plate and an impeller, the left end of the motor rotating shaft is fixedly connected with the left end face of the impeller through an impeller fixing screw, and the middle part of the left end of the pump body is also provided with a drainage pump;

the drainage pump comprises a drainage pump shell, wherein 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 meshed height is called the meshed 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 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 drainage pump shell 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 passes out of the drainage pump shell and is in power connection with a motor rotating shaft through a coupling shaft, and the joint of the driving shaft and the coupling shaft is provided with a driving shaft seal; 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, wherein 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, an 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 manner with the shaft core of a driven shaft cavity, the outlet hole is communicated with a liquid outlet cavity, the height of the liquid outlet cavity is slightly lower than the meshing height and is arranged in a staggered manner with the shaft core of a 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 on the front side and the rear side of the axis plane, the driving shaft hole and the driving shaft are concentrically arranged, a drainage pump inlet pipeline is connected with the inlet hole, and a drainage pump outlet pipeline is connected with the outlet hole;

the pump comprises a pump housing, a pump body, a pump outlet, a pressure relief valve body, a pressure relief inlet, a pressure relief valve body, a pressure relief valve outlet and a pressure relief opening, wherein the lower right half section of the pump housing is provided with a pump body flange plate;

a drainage pump inlet pipeline is arranged in the pump body outside the inlet check valve, the drainage pump inlet pipeline 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, fluid entering from the pump inlet is divided into two branches, one branch directly enters the suction cavity through the inlet check valve, and the other branch enters the suction cavity again through the drainage pump inlet pipeline, the drainage pump and the drainage pump outlet pipeline; the specific working method is as follows:

the air in the pump inlet is quickly discharged into the pump body due to the rotation of the motor rotating shaft and then is discharged out of the pump outlet through the impeller, the motor rotating shaft rotates to drive the impeller and the drainage pump, and 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 due to the fact that the suction cavity and the pump inlet of the pump body are at atmospheric pressure, the suction cavity is at negative pressure, the pump inlet is at atmospheric pressure and is higher than the suction cavity pressure, so that the inlet check valve is opened, and meanwhile, the drainage pump rotates together, and 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, so that the operation is repeated; when the pressure of the suction cavity and the pressure of the pump inlet are balanced, the inlet check valve is closed, the air at the pump inlet is continuously discharged into the suction cavity through the drainage pump by the rotation of the drainage pump, and then the air is discharged out of the pump by the impeller, so that the air in the suction cavity is repeatedly and infinitely nearly exhausted; liquid in the external storage tank is pumped into the suction cavity through the drainage pump, and then liquid with higher pressure is obtained by the rotating impeller under the action of high-speed inertial centrifugal force and pumped out of the pump to enter the discharge pipeline and is conveyed to a required place.

2. The working method of the drainage type constant pressure self-priming pump with the external-open pressure relief valve body, which is characterized in that the external-open pressure relief valve body is a detachable external-open adjustable pressure relief valve;

the detachable outward-opening type adjustable pressure release valve specifically comprises a valve body shell, an adjusting screw rod, a spring, a valve core, a connecting rod, a locking nut, a clamp spring, a spring pressing plate, a choke plug screw and a fixing pin, wherein a pressure release inlet is arranged at the right half section of the bottom of the valve body shell, a pressure release outlet is arranged at the right end of the valve body shell, a circle of valve core bayonet is convexly arranged on the inner wall of the valve body shell at the left side of the pressure release outlet, a valve body flange is outwards arranged at the left end of the valve body shell and connected with a pump shell through a connecting bolt, an internal thread is arranged on the inner wall of the left section of the valve body shell, an external thread is arranged on the periphery of the adjusting screw rod, the adjusting screw rod is screwed into the valve body shell from left to right and is in threaded fit with the valve body shell, the left section of the adjusting screw rod is in a hollow structure which is penetrated from left to right, a transverse spring is arranged in the right section of the adjusting screw rod, the connecting rod is arranged in the spring in a penetrating way, the right end of the connecting rod is connected with the valve core, the appearance of the valve core is matched with the inner cavity of the valve body shell, the valve core is positioned on the right side of the valve core bayonet and can be limited by the valve core bayonet, a circle of clamp spring limiting groove is formed in the inner wall of the right end of the adjusting screw rod in an inward concave way, the clamp spring is arranged in the clamp spring limiting groove, the right end of the spring is in contact connection with the clamp spring, the left end of the connecting rod is sleeved with the spring pressing plate, the right side of the spring pressing plate is in contact connection with the left end of the spring, the end part of the connecting rod on the left side of the spring pressing plate is provided with a fixing pin, the outer ring on the right end of the adjusting screw rod is provided with a first sealing ring, the left end of the adjusting screw rod is screwed into a choke plug screw, a second sealing ring is arranged between the adjusting screw rod and the choke plug screw, and the locking nut is arranged on the left section of the adjusting screw rod in a rotating way and is tightly abutted against the left outer wall of the flange of the valve body to lock the position of the adjusting screw rod.

3. The working method of the drainage type constant pressure self-priming pump with the external opening type pressure relief valve body, which is characterized in that the external opening type pressure relief valve body is an external opening type adjustable pressure relief valve;

the outer-opening type adjustable pressure relief valve is characterized in that a valve body shell does not exist, the outer-opening type adjustable pressure relief valve comprises a valve body shell, an adjusting screw rod, a spring, a valve core, a connecting rod, a locking nut, a clamp spring, a spring pressing plate, a choke plug screw and a fixing pin, an inner thread is arranged on the inner wall of the left section of a pump shell at the installation position of the pressure relief valve body, the periphery of the adjusting screw rod is provided with an outer thread, the adjusting screw rod is screwed into the installation position of the pressure relief valve body from left to right to be matched with the inner thread, the left section of the adjusting screw rod is positioned on the left outer side of the installation position of the pressure relief valve body, the inner cavity wall of the pressure relief valve body is provided with a circle of valve core bayonet, the left end of the clamp spring is in protruding connection with a circle of the valve core, the adjusting screw rod is in a hollow structure penetrating from left to right, a connecting rod is penetrated in the right section of the adjusting screw rod, the appearance of the valve core is matched with the inner cavity of the installation position of the pressure relief valve body, the valve core is positioned on the right side of the valve core and can be limited by the valve core bayonet, the inner wall of the right end of the adjusting screw rod is concavely provided with a circle of limiting groove, the clamp spring is arranged in the left side of the installation position of the pressure relief valve body, the right end is in contact with the left end of the connecting rod, and the sealing ring is tightly connected with the left end of the sealing plate, and the sealing ring is tightly connected with the left end of the sealing ring.

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