WO2023279769A1

WO2023279769A1 - Self-priming centrifugal pump

Info

Publication number: WO2023279769A1
Application number: PCT/CN2022/081966
Authority: WO
Inventors: 颜土富; 颜成刚; 林荣; 张逸; 金士海
Original assignee: 利欧集团浙江泵业有限公司
Priority date: 2021-07-05
Filing date: 2022-03-21
Publication date: 2023-01-12
Also published as: CN113323886B; CN113323886A

Abstract

A self-priming centrifugal pump, comprising a pump body (1), a water inlet (11), a water outlet (12), an impeller (13), a water intake channel (2), an inlet support assembly (3), a flow guide assembly (4), and a pressure compensation assembly (5), wherein the water intake channel (2) is provided in the pump body (1), one end of the water intake channel (2) being in communication with the outside by means of the horizontally arranged water inlet (11), and the other end thereof being in communication with the outside by means of the vertically arranged water outlet (12). The water level of the water inlet of the centrifugal pump is raised by means of the inlet support assembly (3), which avoids the circumstance where injected water for start-up flows from the water outlet (12) and affects the start-up of the centrifugal pump, and ensures that the interior of the pump body (1) is fully and smoothly filled with the water for start-up. The impeller (13) stops rotating, and under the action of a water baffle plate (33), the remaining water inside the pump body (1) is blocked by the water baffle plate (33) and cannot flow out from the water inlet (11), and is thus stored inside the pump body (1) to serve as water for start-up during the next start-up of the centrifugal pump, thereby reducing preparatory work for the next start-up of the centrifugal pump, and making the start-up of the centrifugal pump smoother.

Description

A self-priming centrifugal pump

technical field

The invention belongs to the technical field of centrifugal pumps, in particular to a self-priming centrifugal pump.

Background technique

Centrifugal pumps work by rotating the impeller to cause the water to move centrifugally. Before starting the pump, the pump casing and the suction pipe must be filled with water, and then the motor is started to drive the impeller and the water to rotate at a high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows through the volute pump casing. The pressure water pipeline flowing into the water pump. Self-priming centrifugal pump is a kind of centrifugal pump. Refers to the centrifugal pump that can automatically pump out the gas in the suction pipe and normally deliver the liquid without priming the pump when it is started again, except for the pump that needs to be primed before the first start. The pump is equipped with a suction chamber at the inlet, and the suction pipe is above the center line of the impeller. After the pump is stopped, a part of the liquid remains in the suction chamber. The suction impeller, after being mixed in the impeller (internal mixing type) or the impeller outlet (outer mixing type), enters the gas-liquid separation chamber added at the outlet to separate the gas and liquid, the gas is discharged out of the pump, and the liquid returns to the suction chamber until the suction pipe Filled with fluid, delivers fluid normally.

In the prior art, there is also a patent about a technical solution of a self-priming pump. For example, a Chinese patent with application number CN2014108021716 discloses a self-priming pump. It includes a pump casing with a liquid inlet and a liquid outlet, and a shaft rotatably installed in the pump casing. At least one booster chamber and a gas-liquid separation chamber are installed in the pump casing. Each booster chamber on the shaft An impeller is installed indoors. Wherein a liquid storage chamber is provided between the pressurization chamber and the liquid inlet, and the self-priming pump also includes a communication pipe with an inlet end and an outlet end, the communication pipe is installed on the pump casing, and is located on the Between the pressurization chamber and the liquid inlet, the inlet end of the communication pipe is connected to the liquid inlet, and in multiple sections in the direction perpendicular to the flow direction of the medium, the communication pipe has at least One section is higher than the lowest point of the suction port of the impeller, and at least one section is located above the inlet end; but the above-mentioned patent still has defects, the connecting pipe at the inlet end is bent, so when connected with the external water pipe, the external The part where the water pipe and the connecting pipe are combined is curved. During the start-up process of the water pump, the water flow hits the curved part, which will easily lead to a greater impact on the curved part and greater wear and tear, reducing the service life and easily causing the connection part to fall off. , which affects the normal operation of the centrifugal pump; and under the action of the impeller, the water flow inside the pump body is faster, which generates greater noise and has a greater impact on the internal components of the pump body, which is likely to cause excessive wear of the centrifugal pump and affect service life of centrifugal pumps.

In view of this, the present invention solves the above technical problems by proposing a self-priming centrifugal pump.

Contents of the invention

In order to make up for the shortcomings of the existing technology, it is difficult to solve the connection between the existing self-priming centrifugal pump and the water pipe at the external water source, and the flow rate of the water flow inside the pump body is too fast during the self-priming cycle, which has a greater impact on the internal components; The invention proposes a self-priming centrifugal pump.

The technical solution adopted by the present invention to solve the technical problem is: a self-priming centrifugal pump according to the present invention, including a pump body, a water inlet, a water outlet, an impeller, a water inlet channel, an inlet bracket assembly, a guide body assembly and A pressure supplement assembly; a water inlet channel is provided inside the pump body, one end of the water inlet channel communicates with the outside world through a horizontally arranged water inlet, and the other end communicates with the outside world through a vertically arranged water outlet, and the side of the water outlet The wall is equipped with a pressure supplement assembly through bolts, and the pressure supplement assembly is used to supplement the pressure inside the water outlet; the middle part of the water inlet channel is provided with a rotating shaft, and one end of the shaft is connected to the motor installed inside the pump body; The impeller is fixedly connected to the rotating shaft, and the suction port on the impeller is close to the rotating shaft; the gap between the impellers is equipped with a guide body, and the gap between the outer circle of the guide body and the inner wall of the pump forms a return flow channel ; An inlet bracket assembly is installed near the water inlet in the water inlet channel, and the inlet bracket assembly includes a ring frame body, a self-priming valve, a water retaining plate and a water injection bolt, and the ring frame body is nested in the water inlet channel The part near the water inlet, and the inner surface of the ring frame is fixed with a water baffle, the top of the water baffle is higher than the water inlet and is provided with a diversion groove, and there is a gap between the end of the diversion groove and the inner wall of the pump. A water injection bolt is fixedly connected above the water retaining plate, and a self-priming valve is fixedly connected on the surface of the water retaining plate far away from the water inlet, and the bottom of the self-priming valve communicates with the return passage.

When working, when the centrifugal pump starts to start, connect the water inlet to the water pipe connected to the water source through threads, and connect the water outlet to the working water pipe, because the water inlet and the water outlet are straight pipes perpendicular to the surface of the connected pump body, It makes the connection between the water outlet and the water inlet more smooth, and when the water flows through the centrifugal pump during the start-up process, the impact force of the flowing water on the joint between the water inlet and the water pipe is less; The start-up water passes through the inside of the pump body along the threaded hole where the water injection bolt is located, because the threaded hole where the water injection bolt is located is facing the diversion groove on the water retaining plate, so that the start-up water flows into the pump body smoothly along the diversion groove through the water retaining plate Inside, because the diversion groove is higher than the water inlet, and the water baffle acts as a barrier to the water inside the pump body, it prevents the injected start-up water from flowing out of the water inlet, which affects the start-up of the centrifugal pump, and ensures that the start-up water fills the pump body smoothly Inside, squeeze out the original air inside the pump body to avoid cavitation during the working process of the centrifugal pump; and keep a gap between the end of the diversion groove and the inner wall of the pump body to effectively avoid extrusion due to assembly or water flow impact The function makes the end of the diversion groove collide with the inner wall of the pump and damage it; after the pump body is filled with start-up water, the preparations before starting the centrifugal pump are completed, and then the motor inside the centrifugal pump is started, and the motor drives the shaft to rotate. The rotating shaft drives the impeller to rotate and acts on the start-up water. The start-up water flows out from the water outlet under centrifugal action and generates negative pressure at the suction port on the impeller, so that the water in the water source is continuously sucked into the pump body under the negative pressure and released. It flows out along the water inlet channel to the water outlet and plays a role; and the impeller is a two-stage impeller with a simple structure, a short shaft, a small gap between the impeller and the shaft, small shaking, and low noise; during the process of water flowing through the guide body assembly Among them, the diversion body component starts to pressurize and guide the flowing water, accelerates the water in the water inlet channel to flow to the water outlet, and the water in the water outlet is affected by the pressure-reinforcing component, and the function of the pressure-supplementing component ensures the internal pressure of the water outlet. The water pressure is balanced to avoid damage to the side wall of the water outlet caused by changes in the water pressure in the water outlet, and to make the outflowing water more stable; after the centrifugal pump is used, the motor is turned off, the impeller stops rotating, and the water in the water source also stops flowing into the pump body and because of the function of the water baffle, the remaining water in the pump body is blocked by the water baffle and cannot flow out through the water inlet, so that the remaining water in the pump body can be stored in the pump body and used as a centrifugal pump next time The starting water at the start reduces the preparation work before the next start of the centrifugal pump, making the start of the centrifugal pump smoother; at the next start, start the motor to start the self-priming process of water circulation inside the pump body. First, the motor drives the impeller to rotate. The remaining water in the centrifugal pump flows under the action of the impeller, and is continuously pressurized under the action of the impeller, because the water contains air, so the self-priming valve is activated, and the water flows out from the final stage impeller and is subjected to the action of the self-priming valve along the return channel Close to the self-priming valve again, flow out through the self-priming valve, and flow into the suction port of the first-stage impeller, and form a circular flow through the suction port of the impeller again to complete the cycle self-priming process; in the process of circulating self-priming flow, water The air contained is separated from the water under the agitation of the impeller and the guide body assembly, and flows out from the water outlet, which reduces the air contained in the water and further reduces the cavitation phenomenon generated when the centrifugal pump is working; when the air contained in the water is fully removed Finally, the self-priming valve is closed, and the pump body pumps in normal water from the water source at this time to ensure that the inside of the pump body starts to continue to work normally.

Preferably, a limit block is provided above the self-priming valve on the water retaining plate, and the limit block is used to divert the returning water and enhance the self-priming effect; the limit block is located on the water retaining plate The part facing the surface of the water inlet is concave, and forms a No. 1 depression.

When working, in the process of circulating self-priming, when the water flows out of the self-priming valve through the return channel, it is drained by the limit block and accelerated into the suction port of the first-stage impeller, which further accelerates the circulating flow of the water and reduces the The preparation time before the normal operation of the self-priming pump improves the working efficiency of the self-priming pump; and because the limit block is concave, a No. 1 depression appears at the water baffle facing the water inlet, so that the external water flow passes through during normal operation. After the water inlet flows into the pump body, it first flows into the No. 1 depression, stays in the No. 1 depression for a short time, and then flows into the water inlet channel through the gap between the water baffle and the inner wall of the pump, so that the water baffle is buffered. The impact of the water flow on the water baffle is reduced, thereby reducing the wear of the water baffle and improving the service life of the inlet bracket assembly.

Preferably, the guide body includes a general guide body and a terminal guide body, the general guide body is installed on the rotating shaft at the gap between the impellers; the end guide body is installed on the rotating shaft, and is located at One side of the water outlet, and the terminal diversion body is located below the water outlet; the terminal diversion body includes a drainage ring and a drainage plate, the drainage ring is nested on the side wall of the water inlet channel, and the inner surface of the drainage ring is fixedly connected with a drainage The surface of the drainage plate facing the impeller and the inner surface of the drainage ring are uniformly provided with a plurality of water outlet grooves; the middle of the drainage plate is provided with a No. 1 through hole, and the rotating shaft passes through the No. 1 through hole.

When working, in the process of self-priming cycle, after the water passes through the suction port of the impeller, it is continuously pressurized under the action of the impeller and the semi-conductor. Therefore, when the water continues to flow and contacts the terminal guide, the water will contact the terminal guide. The collision of the diversion plate will reduce the flow rate of water and accelerate the separation of water and air, so that the air contained in the flowing water will accelerate to overflow and flow to the outside through the water outlet, reducing the air contained in the flowing water, thereby reducing the cavitation inside the pump head phenomenon, thereby reducing the wear of the internal structure of the pump body; when the flowing water is blocked from contact with the drainage plate, it flows along the surface of the drainage plate and passes through the No. 1 through hole set in the middle of the drainage plate. At this time, the water flows to the drainage plate and the pump The volume of the gap between the stainless steel bracket covers inside the body increases suddenly, which further accelerates the separation of water and air, so that the air of the flowing water overflows smoothly, and then the water flows along the surface of the diversion plate facing away from the impeller and flows out of the outlet tank, and Under the action of the self-priming valve, it flows to the return channel and participates in the cycle self-priming process.

Preferably, the surface of the diversion plate facing away from the impeller is evenly connected with a plurality of ribs, the ends of the ribs are fixedly connected with the junction of the diversion plate and the drainage ring, and the water outlet groove is located between the ribs In the gap position, the side wall surfaces of the water outlet grooves are slopes parallel to each other, and the side wall surfaces of the annularly distributed water outlet grooves are inclined along the same direction of rotation.

When working, the structural strength of the drainage plate is strengthened through the function of the ribs to avoid damage to the drainage plate under the impact of the continuous flow of water, and the end of the ribs is connected with the junction of the drainage plate and the drainage ring, which also strengthens the structure of the drainage plate. The combination strength of the drainage plate and the drainage ring avoids the separation between the drainage plate and the drainage ring under the impact of the water flow, which affects the service life of the terminal diversion body; The water in the through hole flows out of the outlet groove concentratedly under the guidance of the rib plate, which accelerates the circulation and self-priming process of the water inside the pump body; and the inner surface of the water outlet groove is a parallel slope, so that the circular distribution of the water outlet groove is along the same The swirling inclined chute, so the water passing through the outlet trough further presents a swirling flow under the limitation of the inner surface of the outlet trough, accelerating the process of water-air separation, thereby further reducing cavitation.

Preferably, the pressure supplement assembly includes a pressure tank and a pressure sensor, the pressure tank includes a tank body, a guide sleeve and an air bag, the side wall of the water outlet is horizontally provided with a hole, and the guide port on the side wall of the tank body It is threadedly connected with the No. 1 hole, the guide port communicates with the inside of the tank body, an air bag is provided inside the tank body facing the guide port, and a guide sleeve is provided inside the air bag facing the guide port. The guide sleeve is connected to the side wall of the tank body through a spring, and the pressure sensor is located at a position opposite to the No. 1 hole on the side wall of the water outlet.

When working, when the centrifugal pump is closed after the work is finished, the water pressure in the water outlet suddenly increases at the moment of closing, and the water in the water outlet accelerates to flow to the No. 1 hole, and flows into the tank from the No. 1 hole through the guide port , and squeeze the end of the airbag facing the guide port, causing the air bag to deform, while the end of the guide sleeve inside the airbag facing the guide port is pressed at the same time and squeezes the connected spring to move away from the guide port. With the spring and The deformation of the airbag relieves the impact of the water flow, the water in the water inlet flows into the tank, and reduces the impact of the water flow on the side wall of the water outlet; the pressure inside the water outlet is reduced, and the deformation of the spring connected to the guide sleeve recovers , so that the guide sleeve is reset and the airbag is pushed back, so that the water entering the tank is pressed out, the pressure and water volume inside the pump body are replenished, and the pressure and water volume inside the pump body are balanced, and the pressed water flow impacts the pressure sensor. It is convenient for the pressure sensor to record the use of the pressure tank, which is conducive to the adjustment of the pressure tank; in addition, compared with the existing pressure tank, it does not need to supply air from the outside to realize the effect of supplementing the pressure of the centrifugal pump, and the operation is simple and convenient. Moreover, the plastic material is used, and the structure is simple, the cost is low, and the service life is long.

Preferably, the diameter of the cross-section of the inner surface of the tank is larger than the diameter of the guide port, and the surface of the end of the airbag is provided with a second depression, and the second depression is sunken away from the first hole.

When working, because the cross-section of the inner surface of the tank is larger, the volume inside the tank is larger, which is convenient for the pressure tank to store more water, and when the pressure water inside the pump body is insufficient, it can fully supplement the insufficient water inside the pump body and pressure; and because the surface of the airbag is provided with a No. 2 depression at the position facing the No. 1 hole, when the airbag is reset, the inner surface of the No. 2 depression is conducive to concentrating the water in contact with the moving process of the airbag, so that it does not The extruded water flow is more concentrated to ensure the supplementary pressure inside the pump body; and when the internal pressure of the water outlet is relatively high and impacts the air bag, the concave inner surface makes the pressure on the end of the air bag concentrated, and fully converts the impact into elasticity Potential energy, did not make up the internal pressure of the pump body to make a good reserve.

The beneficial effects of the present invention are as follows:

1. A self-priming centrifugal pump according to the present invention, through the function of the inlet bracket assembly, the inlet water level is increased, which prevents the injected start-up water from flowing out of the water outlet, affecting the start-up of the centrifugal pump, and ensures that the start-up water is filled with the pump smoothly Inside of the pump body; the impeller stops rotating, because of the function of the water baffle, the remaining water in the pump body is blocked by the water baffle and cannot flow out through the water inlet, and is stored inside the pump body as the starting point for the next startup of the centrifugal pump. Use less water, reduce the preparation work before the next start of the centrifugal pump, and make the start of the centrifugal pump smoother.

2. A self-priming centrifugal pump according to the present invention, during the self-priming cycle of the centrifugal pump, by making the flowing water come into contact with the diversion plate on the end guide body, the blocked flow rate of the water is reduced, and the water vapor is accelerated. Separation makes the air contained in the flowing water overflow faster and flow to the outside through the water outlet, reducing the air contained in the flowing water, thereby reducing the cavitation phenomenon inside the pump head, thereby reducing the wear of the internal structure of the pump body; and when the water flows to The volume of the gap between the drainage plate and the stainless steel bracket cover inside the pump body suddenly increases, which further accelerates the separation of water and air, making the air of flowing water overflow smoothly.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a sectional view of the present invention;

Fig. 2 is a partial enlarged view of place A in Fig. 1;

Fig. 3 is a partial enlarged view of place B in Fig. 1;

Fig. 4 is a perspective view of an inlet bracket assembly in the present invention;

Fig. 5 is a perspective view of another angle of view of the inlet bracket assembly in the present invention;

Fig. 6 is a perspective view of a terminal guide body in the present invention;

In the figure: pump body 1, water inlet 11, water outlet 12, No. 1 hole 121, impeller 13, suction inlet 131, return channel 14, water inlet channel 2, rotating shaft 21, inlet bracket assembly 3, ring frame body 31, automatic Suction valve 32, water retaining plate 33, water injection bolt 34, diversion groove 35, limit block 36, No. 1 recess 361, diversion body assembly 4, general diversion body 41, terminal diversion body 42, diversion ring 421, diversion plate 422, water outlet tank 423, No. 1 through hole 424, rib plate 425, slope 426, pressure supplement assembly 5, pressure tank 51, tank body 511, guide sleeve 512, air bag 513, guide port 514, No. 2 depression 515, pressure Receptor 52.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

As shown in Figures 1 to 6, a self-priming centrifugal pump according to the present invention includes a pump body 1, a water inlet 11, a water outlet 12, an impeller 13, a water inlet channel 2, an inlet bracket assembly 3, a guide body Component 4 and pressure boosting component 5; said pump body 1 is provided with a water inlet channel 2, one end of said water inlet channel 2 communicates with the outside world through a horizontally arranged water inlet 11, and the other end communicates with the outside world through a vertically arranged water outlet 12. The outside is connected, and the side wall of the water outlet 12 is equipped with a pressure supplement assembly 5 through bolts, and the pressure supplement assembly 5 is used to supplement the pressure inside the water outlet 12; the middle part of the water inlet channel 2 is provided with a rotating shaft 21, One end of the rotating shaft 21 is connected to the motor installed inside the pump body 1; the impeller 13 is fixedly connected to the rotating shaft 21, and the suction port 131 on the impeller 13 is close to the rotating shaft 21; the gap between the impellers 13 is installed with The guide body assembly 4, the gap between the outer circle of the guide body assembly 4 and the inner wall of the pump body 1 forms a return flow channel 14; the inlet bracket assembly 3 is installed in the water inlet channel 2 near the water inlet 11, the The inlet bracket assembly 3 includes a ring frame body 31, a self-priming valve 32, a water retaining plate 33 and a water injection bolt 34. The ring frame body 31 is nested in the water inlet channel 2 near the water inlet 11, and the ring frame body 31 The inner surface is fixed with a water retaining plate 33, the top of the water retaining plate 33 is higher than the water inlet 11 and is provided with a diversion groove 35, and a gap is maintained between the end of the diversion groove 35 and the inner wall of the pump body 1, and the water retaining A water injection bolt 34 is fixedly connected above the plate 33 , and a self-priming valve 32 is fixedly connected on the surface of the water retaining plate 33 away from the water inlet 11 , and the bottom of the self-priming valve 32 communicates with the return passage 14 .

When working, when the centrifugal pump starts to start, connect the water inlet 11 with the water pipe connected to the water source through threads, and connect the water outlet 12 with the working water pipe, because the water inlet 11 and the water outlet 12 are perpendicular to the connected pump body 1 The straight pipe on the surface makes the connection between the water outlet 12 and the water inlet 11 more smooth, and when the water flows through the centrifugal pump during the start-up process, the impact force of the flowing water on the joint between the water inlet 11 and the connecting water pipe is small; Finally, open the water injection bolt 34, at first the starting water will pass through the inside of the pump body 1 along the threaded hole where the water injection bolt 34 is located, because the threaded hole where the water injection bolt 34 is located is facing the diversion groove 35 on the water retaining plate 33, so that the start-up Water smoothly flows into the pump body 1 along the diversion groove 35 through the water retaining plate 33, because the diversion groove 35 is higher than the water inlet 11, and the water retaining plate 33 acts as a barrier to the water inside the pump body 1, avoiding injection The start-up water flows out from the water inlet 11, which affects the start-up of the centrifugal pump, ensures that the start-up water fills the inside of the pump body 1 smoothly, squeezes out the original air inside the pump body 1, and avoids cavitation during the working process of the centrifugal pump; and A gap is maintained between the end of the diversion groove 35 and the inner wall of the pump body 1, effectively avoiding the extrusion effect due to assembly or water flow impact, causing collision and damage between the end of the diversion groove 35 and the inner wall of the pump body 1; After filling the inside of the pump body 1, the preparations before starting the centrifugal pump are completed, and then the motor inside the centrifugal pump is started. The motor drives the rotating shaft 21 to rotate, and the rotating shaft 21 drives the impeller 13 to rotate and act on the starting water. The water outlet 12 flows out and generates negative pressure at the suction port 131 on the impeller 13, so that the water in the water source is continuously sucked into the pump body 1 under the action of negative pressure and flows out to the water outlet 12 along the water inlet channel 2 to play a role and the impeller 13 is a secondary impeller 13 with a simple structure, a short rotating shaft 21, a small gap between the impeller 13 and the rotating shaft 21, little shaking, and low noise generated; It pressurizes and guides the flowing water, accelerates the water in the water inlet channel 2 to flow to the water outlet 12, and the water in the water outlet 12 is subjected to the action of the pressure-reinforcing component 5, and the function of the pressure-reinforcing component 5 ensures that the water outlet The water pressure inside 12 is balanced to avoid damage to the side wall of the water outlet 12 caused by the change of water pressure in the water outlet 12, and make the outflowing water more stable; after the centrifugal pump is used, the motor is turned off, the impeller 13 stops rotating, and the water source The water also stops flowing into the pump body 1; and because of the effect of the water retaining plate 33, the remaining water in the pump body 1 is blocked by the water retaining plate 33 and cannot flow out through the water inlet 11, so that the remaining water in the pump body 1 It can be stored inside the pump body 1 and used as the starting water for the next startup of the centrifugal pump, reducing the preparation work before the next startup of the centrifugal pump and making the startup of the centrifugal pump smoother; at the next startup, start the motor and start the pump body 1. In the self-priming process of internal water circulation, the motor first drives the impeller 13 to rotate, and the remaining water in the centrifugal pump flows under the action of the impeller 13, and is continuously pressurized under the action of the impeller 13. Because the water contains air, the self-priming valve 32 is activated. After the water flows out from the final stage impeller 13, it is affected by the self-priming valve 32 along the return channel 14 and approaches the self-priming valve 32 again, and flows out through the self-priming valve 32 and flows into the The suction port 131 of the first-stage impeller 13 forms a circulation flow through the suction port 131 of the impeller 13 again, and completes the cycle self-priming process; during the process of the cycle self-priming flow, the air contained in the water is agitated by the impeller 13 and the guide body assembly 4 Under the action, it is separated from the water and flows out from the water outlet 12, which reduces the air contained in the water and further reduces the cavitation phenomenon generated when the centrifugal pump is working; when the air contained in the water is fully removed, the self-priming valve 32 is closed, and at this time The pump body 1 draws in normal water from the water source to ensure that the inside of the pump body 1 continues to work normally.

As a specific embodiment of the present invention, a limiting block 36 is arranged above the self-priming valve 32 on the water retaining plate 33, and the limiting block 36 is used to divert the returning water and enhance the self-priming effect The position of the limiting block 36 on the water retaining plate 33 facing the surface of the water inlet 11 is concave, and forms a No. 1 concave portion 361 .

When working, in the cycle self-priming process, when the water flows out of the self-priming valve 32 through the return channel 14, it is accelerated by the drainage effect of the limiting block 36 and flows into the suction port 131 of the first-stage impeller 13, further accelerating the water flow. Circulating flow reduces the preparation time of the self-priming pump before normal operation and improves the working efficiency of the self-priming pump; and because the limit block 36 is concave, a No. 1 depression appears at the place where the water retaining plate 33 is facing the water inlet 11 361 makes it work normally, the external water flows into the pump body 1 through the water inlet 11 and then first flows into the No. 1 depression 361, and stays in the No. 1 depression 361 for a short time before passing through the gap between the water retaining plate 33 and the inner wall of the pump body 1 The gap between them flows into the water inlet channel 2, so that the water retaining plate 33 is buffered, reducing the impact of the water flow on the water retaining plate 33, thereby reducing the wear of the water retaining plate 33 and improving the service life of the inlet bracket assembly 3.

As a specific embodiment of the present invention, the guide body includes a general guide body 41 and a terminal guide body 42, and the general guide body 41 is installed on the rotating shaft 21 at the gap between the impellers 13; The guide body 42 is installed on the rotating shaft 21, and is located on the side of the impeller 13 away from the water inlet 11, and the end guide body 42 is located below the water outlet 12; the end guide body 42 includes a guide ring 421 and a guide plate 422, the The drainage ring 421 is nested on the side wall of the water inlet channel 2, and the inner surface of the drainage ring 421 is fixedly connected with a drainage plate 422, and the junction of the surface of the drainage plate 422 facing the impeller 13 and the inner surface of the drainage ring 421 is evenly arranged. A plurality of water outlet grooves 423 ; a No. 1 through hole 424 is provided in the middle of the diversion plate 422 , and the rotating shaft 21 passes through the No. 1 through hole 424 .

When working, in the process of self-priming cycle, the water will continue to be pressurized under the action of the impeller 13 and the semi-conductor after passing through the suction port 131 of the impeller 13, so when the water continues to flow and contacts with the terminal guide 42, the water and The deflector plate 422 on the guide body collides to reduce the flow velocity of water and accelerate the separation of water and air, so that the air contained in the flowing water is accelerated to overflow and flow to the outside through the water outlet 12, reducing the air contained in the flowing water, thereby reducing the pump pressure. The cavitation phenomenon inside the head, thereby reducing the wear of the internal structure of the pump body 1; when the flowing water is blocked from contacting the drain plate 422, it flows along the surface of the drain plate 422 and passes through the No. 1 through hole 424 set in the middle of the drain plate 422 At this time, the water flows to the gap between the drainage plate 422 and the stainless steel bracket cover inside the pump body 1, and the volume suddenly increases, which further accelerates the separation of water and air, so that the air of the flowing water overflows smoothly, and then the water flows along the drainage plate 422 The surface facing away from the impeller 13 flows out of the water outlet groove 423, and flows to the return channel 14 under the action of the self-priming valve 32 to participate in the cyclic self-priming process.

As a specific embodiment of the present invention, the surface of the diversion plate 422 facing away from the impeller 13 is evenly fixed with a plurality of ribs 425, and the ends of the ribs 425 are in contact with the junction of the diversion plate 422 and the diversion ring 421. Fixed connection, the water outlet groove 423 is located in the gap between the ribs 425, and the side wall surfaces of the water outlet groove 423 are mutually parallel inclined planes 426, and the side wall surfaces of the annularly distributed water outlet grooves 423 are inclined along the same direction of rotation .

During work, the structural strength of the drain plate 422 is strengthened through the effect of the rib plate 425, so as to avoid damage to the drain plate 422 under the impact of the continuously flowing water flow, and the joint between the end of the rib plate 425 and the drain plate 422 and the drain ring 421 connected, and also strengthen the bonding strength of the diversion plate 422 and the diversion ring 421, to avoid the separation between the diversion plate 422 and the diversion ring 421 under the impact of water flow, which affects the service life of the terminal diversion body 42; and the outlet groove 423 is located at The gap between the ribs 425 allows the water passing through the No. 1 through hole 424 to flow out of the water outlet tank 423 under the guidance of the ribs 425, which accelerates the water circulation and self-priming process inside the pump body 1; and the water outlet tank The inner surface of 423 is a parallel slope 426, so that the annularly distributed water outlet grooves 423 are inclined grooves along the same direction of rotation, so the water passing through the water outlet grooves 423 further presents a swirling flow under the restriction of the inner surface of the water outlet grooves 423 , to accelerate the process of water-air separation, thereby further reducing cavitation.

As a specific embodiment of the present invention, the pressure supplement assembly 5 includes a pressure tank 51 and a pressure sensor 52, the pressure tank 51 includes a tank body 511, a guide sleeve 512 and an air bag 513, and the side wall of the water outlet 12 is horizontal There is a No. 1 hole 121, and the guide port 514 on the side wall of the tank body 511 is connected with the No. 1 hole 121 by threads. The guide port 514 communicates with the inside of the tank body 511, and the inside of the tank body 511 faces the guide The mouth 514 is provided with an airbag 513, and the inside of the airbag 513 is provided with a guide sleeve 512 facing the guide port 514. The guide sleeve 512 is connected to the side wall of the tank body 511 through a spring, and the pressure sensor 52 is located at the water outlet. 12 The position where the side wall is opposite to the No. 1 hole 121.

When working, when the centrifugal pump is closed after the work is completed, the water pressure in the water outlet 12 suddenly increases at the moment of closing, and the water in the water outlet 12 accelerates to flow to the No. 1 hole 121, and passes through the No. 1 hole 121. The guide port 514 flows into the inside of the tank body 511, and squeezes the end of the air bag 513 facing the guide port 514, causing the air bag 513 to deform, while the end of the guide sleeve 512 facing the guide port 514 inside the air bag 513 is simultaneously pressed and squeezed The connected spring moves away from the direction of the guide port 514. With the deformation of the spring and the air bag 513, the impact of the water flow is relieved, and the impact of the water flow on the side wall of the water outlet 12 is reduced; the pressure inside the water outlet 12 reduces , the deformation of the spring connected to the guide sleeve 512 recovers, so that the guide sleeve 512 resets and pushes the air bag 513 to reset, so that the water entering the tank body 511 is pressed out, replenishing the pressure and water volume inside the pump body 1, and affecting the pressure and water volume inside the pump body 1 The amount of water is balanced, and the pressed water flow impacts the pressure sensor 52, which is convenient for the pressure sensor 52 to record the usage of the pressure tank 51, and is beneficial to adjust the pressure tank 51; in addition, compared with the existing pressure tank 51, no need Supplementing air from the outside can realize the effect of supplementing pressure on the centrifugal pump, which is easy to operate, and is made of plastic material, with simple structure, low cost and long service life.

As a specific embodiment of the present invention, the diameter of the cross-section of the inner surface of the tank body 511 is greater than the diameter of the guide port 514, and the surface of the end of the airbag 513 is provided with a second concave portion 515, and the second concave portion 515 is directed away from The direction of the No. 1 hole 121 is concave.

When working, because the cross-section of the inner surface of the tank body 511 is larger, the volume inside the tank body 511 is larger, which is convenient for the pressure tank 51 to store more water, and when the internal pressure of the pump body 1 is insufficient, the pump can be fully replenished. Insufficient water volume and pressure inside the body 1; and because the surface of the air bag 513 is facing the No. 1 hole 121, there is a second recess 515, when the air bag 513 is reset, the inner surface of the second recess 515 is moving with the air bag 513 During the process, it is beneficial to concentrate the water in contact with each other, so that the water flow that is extruded is more concentrated to ensure the supplementary pressure inside the pump body 1; and when the internal pressure of the water outlet 12 is relatively high and impacts the air bag 513, the concave inner surface makes the air bag 513 The pressure on the end is concentrated, and the impact is fully converted into elastic potential energy, and the internal pressure of the pump body 1 is not supplemented to make a reserve.

The specific workflow is as follows:

When working, the water injection bolt 34 is opened, and the starting water is first passed through the inside of the pump body 1 along the threaded hole where the water injection bolt 34 is located, because the threaded hole where the water injection bolt 34 is located is facing the diversion groove 35 on the water retaining plate 33, so that The start-up water smoothly flows into the pump body 1 along the diversion groove 35 through the water retaining plate 33, because the diversion groove 35 is higher than the water inlet 11, and the water retaining plate 33 acts as a barrier to the water inside the pump body 1, avoiding the The injected start-up water flows out from the water inlet 11, which affects the start-up of the centrifugal pump, ensures that the start-up water fills the pump body 1 smoothly, squeezes out the original air inside the pump body 1, and avoids cavitation during the working process of the centrifugal pump; Moreover, a gap is maintained between the end of the diversion groove 35 and the inner wall of the pump body 1, effectively avoiding the extrusion effect due to assembly or water flow impact, causing collision and damage between the end of the diversion groove 35 and the inner wall of the pump body 1; After the pump is used, turn off the motor, the impeller 13 stops rotating, and the water in the water source stops flowing into the pump body 1; It cannot flow out through the water inlet 11, so that the remaining water in the pump body 1 can be stored in the pump body 1, and used as the starting water for the next startup of the centrifugal pump, reducing the preparation work before the next startup of the centrifugal pump, so that the centrifugal pump The start-up is smoother; at the next start-up, start the motor to start the self-priming process of water circulation inside the pump body 1. First, the motor drives the impeller 13 to rotate. Because the water contains air, the self-priming valve 32 is activated. After the water flows out from the final stage impeller 13, it is affected by the self-priming valve 32 along the return channel 14 and approaches the self-priming valve 32 again, and passes through the self-priming valve. 32 flows out, and flows into the suction port 131 of the first-stage impeller 13, and forms a circulation flow through the suction port 131 of the impeller 13 again, completing the cycle self-priming process; in the process of the cycle self-priming flow, the air contained in the water flows between the impeller 13 and the guide Under the agitation of the fluid component 4, it is separated from the water and flows out from the water outlet 12, which reduces the air contained in the water and further reduces the cavitation phenomenon generated when the centrifugal pump is working; when the air contained in the water is fully removed, the self-priming valve 32 is closed, at this time, the pump body 1 draws in normal water from the water source to ensure that the inside of the pump body 1 continues to work normally; Under the effect of continuous pressurization, when the water continues to flow and contacts with the end guide body 42, the water collides with the guide plate 422 on the guide body, so that the flow rate of the water is reduced, and the separation of water and gas is accelerated, so that the flowing water contains The air accelerates to overflow, and flows to the outside through the water outlet 12, reducing the air contained in the flowing water, thereby reducing the cavitation phenomenon inside the pump head, thereby reducing the wear of the internal structure of the pump body 1; when the contact between the flowing water and the drainage plate 422 is blocked Then it flows along the surface of the diversion plate 422, and passes through the No. 1 through hole 424 provided in the middle of the diversion plate 422. At this time, the water flow Move to the gap between the diversion plate 422 and the stainless steel bracket cover inside the pump body 1, the volume suddenly increases, which further accelerates the separation of water and air, so that the air of the flowing water overflows smoothly, and then the water moves away from the impeller 13 along the diversion plate 422 The surface of the centrifugal pump flows out from the water outlet tank 423, and flows to the return channel 14 under the action of the self-priming valve 32 to participate in the cycle self-priming process; when the centrifugal pump is closed after the work is completed, at the moment of closing, the The water pressure increases suddenly, and the water in the water outlet 12 accelerates to the No. 1 hole 121, and flows from the No. 1 hole 121 through the guide port 514 into the inside of the tank body 511, and squeezes the end of the air bag 513 facing the guide port 514, The airbag 513 is deformed, and the end of the guide sleeve 512 facing the guide opening 514 inside the airbag 513 is simultaneously pressed and squeezed to move the connected spring in a direction away from the guide opening 514. With the deformation of the spring and the airbag 513, the water flow impacts The effect is relieved, the water in the water inlet 11 flows into the inside of the tank body 511, and the impact of the water flow on the side wall of the water outlet 12 is reduced; the pressure inside the water outlet 12 is reduced, and the deformation of the spring connected to the guide sleeve 512 recovers, making The guide sleeve 512 resets and pushes the air bag 513 to reset, so that the water entering the tank body 511 is pressed out, replenishing the pressure and water volume inside the pump body 1, balancing the pressure and water volume inside the pump body 1, and being impacted by the water flow extruded The pressure sensor 52 is convenient for the pressure sensor 52 to record the use of the pressure tank 51, which is beneficial to adjust the pressure tank 51; in addition, compared with the existing pressure tank 51, the centrifugal pump can be realized without supplementing air from the outside. Excellent pressure compensation effect, easy operation, and use of plastic material, simple structure, low cost and long service life.

The above-mentioned front, back, left, right, up, and down are all based on Figure 1 in the accompanying drawings of the specification, and according to the viewing angle of the person as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left. And so on.

In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the Means that a device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the invention.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims

A self-priming centrifugal pump, characterized in that it includes a pump body (1), a water inlet (11), a water outlet (12), an impeller (13), a water inlet channel (2), an inlet bracket assembly (3), The guide body assembly (4) and the pressure supplement assembly (5); the pump body (1) is provided with a water inlet passage (2), and one end of the water inlet passage (2) passes through a horizontally arranged water inlet (11) and The outside is communicated, and the other end communicates with the outside world through a vertical water outlet (12), and the side wall of the water outlet (12) is equipped with a pressure-replenishing assembly (5) through bolts, and the pressure-replenishing assembly (5) is used to Supplementing the pressure inside the water outlet (12); the middle part of the water inlet channel (2) is provided with a rotating shaft (21), and one end of the rotating shaft (21) is connected to the motor installed inside the pump body (1); the The impeller (13) is fixedly connected to the rotating shaft (21), and the suction port (131) on the impeller (13) is close to the rotating shaft (21); the gap between the impellers (13) is equipped with a deflector assembly (4) , the gap between the outer circle of the guide body assembly (4) and the inner wall of the pump body (1) forms a backflow channel (14); the position near the water inlet (11) in the water inlet channel (2) is equipped with an inlet Bracket assembly (3), the inlet bracket assembly (3) includes a ring frame body (31), a self-priming valve (32), a water retaining plate (33) and a water injection bolt (34), and the ring frame body (31) It is nested in the water inlet channel (2) near the water inlet (11), and the inner surface of the ring frame (31) is fixedly connected with a water baffle (33), and the top of the water baffle (33) is higher than the water inlet ( 11) A diversion groove (35) is also provided, and a gap is maintained between the end of the diversion groove (35) and the inner wall of the pump body (1), and a water injection bolt (34) is fixedly connected above the water retaining plate (33). ), and a self-priming valve (32) is fixedly connected to the surface away from the water inlet (11) on the water retaining plate (33), and the bottom of the self-priming valve (32) communicates with the return passage (14).
A self-priming centrifugal pump according to claim 1, characterized in that: a limit block (36) is arranged above the self-priming valve (32) on the water retaining plate (33), and the limit block ( 36) It is used to divert the backflowing water and enhance the self-priming effect; the stop block (36) is located on the water retaining plate (33) and is concave in the part facing the surface of the water inlet (11), and forms a No. Depression (361).
A self-priming centrifugal pump according to claim 2, characterized in that: the guide body assembly (4) includes a general guide body (41) and a terminal guide body (42), and the general guide body (41) Installed on the shaft (21) at the gap between the impellers (13); side, and the end guide body (42) is located below the water outlet (12); The water channel (2) side wall, the inner surface of the drainage ring (421) is fixedly connected with the drainage plate (422), and the surface of the drainage plate (422) is facing the impeller (13) and the inner surface of the drainage ring (421). A plurality of water outlet grooves (423) are uniformly arranged at the junction; a No. 1 through hole (424) is provided in the middle of the drainage plate (422), and the rotating shaft (21) passes through the No. 1 through hole (424).
A self-priming centrifugal pump according to claim 3, characterized in that: the surface of the drainage plate (422) facing away from the impeller (13) is evenly fixed with a plurality of ribs (425), and the ribs The end of (425) is fixedly connected with the junction of the drain plate (422) and the drain ring (421), the water outlet groove (423) is located in the gap between the ribs (425), and the water outlet groove (423) side The wall surfaces are inclined planes (426) parallel to each other, and the side wall surfaces in the annularly distributed water outlet grooves (423) are inclined along the same direction of rotation.
A self-priming centrifugal pump according to claim 4, characterized in that: the pressure supplement assembly (5) includes a pressure tank (51) and a pressure sensor (52), and the pressure tank (51) includes a tank body (511), guide sleeve (512) and air bag (513), described water outlet (12) side wall is horizontally provided with a No. 1 hole (121), guide port (514) on the side wall of described tank (511) and The No. 1 hole (121) is threadedly connected, the guide port (514) communicates with the inside of the tank body (511), and the inside of the tank body (511) is provided with an air bag (513) facing the guide port (514). ), the inside of the air bag (513) is provided with a guide sleeve (512) facing the guide port (514), the guide sleeve (512) is connected to the side wall of the tank body (511) through a spring, and the pressure sensor ( 52) It is located at the position where the side wall of the water outlet (12) is opposite to the No. 1 hole (121).
A self-priming centrifugal pump according to claim 5, characterized in that: the diameter of the inner surface section of the tank body (511) is larger than the diameter of the guide port (514), and the end surface of the air bag (513) is provided with The second recessed part (515), the second recessed part (515) is recessed in a direction away from the first hole (121).