CN113007101A - Jet type self-priming centrifugal pump capable of being automatically adjusted - Google Patents
Jet type self-priming centrifugal pump capable of being automatically adjusted Download PDFInfo
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- CN113007101A CN113007101A CN202110320599.7A CN202110320599A CN113007101A CN 113007101 A CN113007101 A CN 113007101A CN 202110320599 A CN202110320599 A CN 202110320599A CN 113007101 A CN113007101 A CN 113007101A
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- 239000012530 fluid Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000005086 pumping Methods 0.000 claims description 21
- 230000000903 blocking effect Effects 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 11
- 238000007789 sealing Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
- F04D9/06—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock of jet type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
- F04D9/044—Means for rendering the priming pump inoperative
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
- F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an automatically-adjusted jet type self-priming centrifugal pump, which comprises a pump shell, a jet pipe and a power part, wherein the pump cavity is arranged in the pump shell, the jet pipe and the power part are positioned in the pump cavity, the automatically-adjusted jet type self-priming centrifugal pump is characterized in that a backflow hole is formed in the jet pipe, the backflow hole is communicated with the jet pipe and the pump cavity, the power part works to lead part of fluid in the pump cavity into the jet pipe from the backflow hole, a movable stopper is arranged in the pump cavity, a distance is formed between the stopper and the backflow hole, and the stopper can be driven by the fluid with the. The jet type self-priming centrifugal pump of the push-pull type piston valve can block the backflow hole under large flow so as to improve the cavitation phenomenon.
Description
Technical Field
The invention relates to the field of fluid machinery, in particular to an automatically-adjusted jet type self-priming centrifugal pump.
Background
The jet self-priming centrifugal pump completes self-priming by means of a jet device (comprising an inlet bent pipe, a jet pipe and a backflow hole) at the inlet of an impeller. The jet type self-priming centrifugal pump has high suction lift requirement, mostly reaches the suction lift of 4-8 meters, and even reaches more than 8 meters in some application scenes.
In order to obtain a higher suction lift, the diameter of the jet pipe needs to be reduced to obtain a higher jet speed and thus a higher negative pressure to achieve self-suction. When self-priming is completed, the liquid in the cavity still enters the jet pipe from the backflow hole. If the suction distance is higher, the flow velocity of the jet pipe part is higher when the jet type self-priming centrifugal pump works under large flow, so that cavitation is easy to occur, and then larger noise is generated, and the use experience of a user is reduced. Meanwhile, the higher flow velocity at the jet pipe part also brings larger friction loss, and the efficiency of the pump is influenced.
In the prior art, the cavitation problem is solved, and the structure of the ejector is generally improved. For example, the Chinese invention patent, namely jet device for improving the cavitation performance of jet centrifugal pump, applies for (patent) No.: CNCN201610431975.9, comprising a nozzle, a flow guiding section, a mixing section, a throat, a diffuser section and a pressurizing hole. When the jet type centrifugal pump operates under a large-flow working condition, a pressurizing hole is designed at the throat part of the jet device, high-pressure liquid in a pump cavity is introduced into a low-pressure area of the throat through the pressurizing hole, the pressure of the low-pressure area of the throat is increased, and cavitation induced vibration and noise in the throat of the jet device are inhibited. There are also improvements made to the impeller structure, such as "a centrifugal pump impeller" published by chinese patent information, application (patent) no: CN201610013096.4, including impeller front shroud, impeller back shroud and a plurality of blade, be provided with a plurality of efflux hole on the impeller front shroud, this efflux hole is located the position that is close to on the impeller front shroud the import of blade, and this efflux hole extends along the back of blade with the intersection line of impeller front shroud. The jet hole is an oblong hole, the width of the jet hole is 2-3mm, and the length of the jet hole is 1/3-1/2 of the width of the inlet edge of the blade. The centrifugal pump impeller increases the pressure of liquid at the lowest pressure point, avoids the escape of gas dissolved in the liquid to form a large number of bubbles, improves the flow of liquid at the inlet of the centrifugal pump impeller, improves the cavitation performance of the centrifugal pump, simplifies the structure and reduces the cost.
However, the cavitation problem of the centrifugal pump cannot be completely solved by adopting the improvement of the structure, and the cavitation possibility still exists after the fluid in the jet pipe reaches a certain speed and a certain flow rate. Therefore, the invention designs a new technical scheme to improve the cavitation problem of the centrifugal pump.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatically-adjusted jet type self-priming centrifugal pump which can block a backflow hole under a large flow so as to improve the cavitation phenomenon.
The technical scheme adopted by the invention for solving the technical problems is as follows: an automatically-adjusted jet type self-priming centrifugal pump comprises a pump shell, a jet pipe and a power part, wherein a pump cavity is formed in the pump shell, the jet pipe and the power part are located in the pump cavity, the automatically-adjusted jet type self-priming centrifugal pump is characterized in that a backflow hole is formed in the jet pipe, the backflow hole is communicated with the jet pipe and the pump cavity, the power part works to enable part of fluid in the pump cavity to be led into the jet pipe from the backflow hole, a movable blocking piece is arranged in the pump cavity, a distance exists between the blocking piece and the backflow hole, and the blocking piece can be driven by.
Compared with the prior art, the invention has the advantages that the impeller can throw the fluid from the jet pipe outwards to the pump cavity when working, and the part of the fluid in the pump cavity can be led into the jet pipe through the backflow hole. In the self-priming process of the centrifugal pump, fluid in the pump cavity is gas-liquid mixture, the impact force on the stopper is small, and the stopper is not enough to drive the stopper to block the backflow hole under the action of the fluid. The backflow hole is in an open state, fluid enters the jet pipe to generate jet flow, so that negative pressure is formed, the negative pressure enables liquid at the water inlet pipe of the centrifugal pump to be sucked into the centrifugal pump, gas in the pump cavity is continuously discharged, and self-suction is gradually completed.
After the self-priming is finished, the medium in the pump cavity is water. When the flow of the fluid is smaller than the preset value, the impact force of the fluid on the stopper is not enough to drive the stopper to block the backflow hole, namely, the backflow hole is in an open state. The flow velocity of the fluid entering the jet pipe is small, the negative pressure is small, and the cavitation phenomenon can not occur. When the flow rate of the fluid is larger than the preset value, the impact force of the fluid on the stopper is larger, so that the stopper is driven to block the backflow hole, and the backflow hole is closed at the moment. At the moment, the fluid in the pump cavity can not enter the jet pipe through the backflow hole, so that the flow velocity in the jet pipe is reduced, and the cavitation phenomenon and the noise brought therewith are avoided. The friction loss in the jet pipe and in the pump cavity is effectively reduced, and the efficiency of the pump is improved.
The present invention provides a barrier that is capable of moving as the fluid moves. In the self-priming process of the centrifugal pump, the stopper does not act on the backflow hole, the backflow hole is opened, and the centrifugal pump finishes self-priming. After self-suction is completed, if the flow is large, the flow velocity in the jet pipe is large, the generated negative pressure is also large, a large amount of water enters the jet pipe through the backflow hole in the pump cavity, and cavitation is easy to occur. But the stopper is arranged, the stopper can act on the backflow hole when the flow rate is large, and the backflow hole is closed, so that water in the pump cavity cannot enter the jet pipe through the backflow hole. Thereby remarkably reducing the flow velocity in the jet pipe and avoiding cavitation and noise brought by the cavitation.
In addition, in the structure of the whole centrifugal pump, according to different ambient pressures, the air content of the fluid in the pump cavity is greater than that of the fluid to be sucked outside the pump cavity, and the air content of the fluid outside the pump cavity is greater than that in the jet pipe. The backflow orifice is closed by a stop when the fluid flow rate within the centrifugal pump is greater than a predetermined value. I.e., to block the path of fluid in the pump chamber into the fluidic tube. The fluid with high air content is prevented from entering the jet pipe, so that the air content of the fluid in the jet pipe is reduced, and the effect of avoiding cavitation can be achieved.
Further preferred embodiments of the present invention: the blocking piece is arranged outside the backflow hole, and a distance is reserved between the blocking piece and the backflow hole.
That is, when the stopper is not or only slightly stressed, there is a gap between the stopper and the backflow hole, and the fluid can pass through the backflow hole. And under the condition that the stress on the stopper is larger, namely the flow of the fluid reaches a preset value, the stopper can move to the backflow hole under the stress, so that the backflow hole is blocked.
Furthermore, the blocking piece is an arc-shaped sheet structural piece, the inner diameter of the inlet end of the backflow hole is larger than that of the outlet end of the backflow hole, and the backflow hole is closed when the blocking piece is attached to the inner wall of the backflow hole.
The inner wall surface of the backflow hole is in arc transition, the blocking piece is an arc sheet-shaped structural piece, and the blocking piece is protruded towards one side of the backflow hole. The sealing element is adapted to the structure of the backflow hole, so that a sealing surface with good sealing effect can be provided when the sealing element acts on the inner wall surface of the backflow hole. The front surface of the blocking piece is an arc convex surface, and the back surface of the blocking piece is an arc concave surface. The fluid entering the reflow hole exerts a force on the concave surface of the stopper, thereby pressing the stopper against the wall surface of the reflow hole. And because the inner diameter of the backflow hole is gradually decreased from left to right, the higher the flow rate of the fluid is, the higher the acting force on the stopper is, and the more reliable the sealing that the stopper presses on the wall surface of the backflow hole is.
Furthermore, the blocking piece is arranged on the pump shell or the water inlet pipe through a connecting rod, and the connecting rod can deform under stress.
When the barrier is subjected to the force exerted by the fluid, the force is transmitted to the linkage. The connecting rod can be made of elastic materials, and the connecting rod deforms under stress, so that the position of the blocking piece can move.
The connecting rod is adopted to install the stopper, so that the stopper can be installed by other schemes, and the wall surface of the backflow hole can be sealed as long as the stopper can extend into the backflow hole by receiving the thrust of the fluid.
Further, the backflow hole is formed in the end portion of the jet pipe.
Specifically, if the backflow hole is located at the left end of the jet pipe, the water pumping chamber is located at the right end of the jet pipe. The pumping chamber works to guide the fluid in the pump cavity from the right end to the left end, and the fluid reaches the left end and is guided into the jet pipe from the backflow hole. Namely, the fluid flows from the left end to the right end of the jet pipe, so as to realize the negative pressure generated by the jet flow. The fluid from the jet pipe is guided to the left end from the right end by the thrust of the water pressing chamber again to form a circulation.
Further, the jet flow device also comprises a water inlet pipe, and the water inlet pipe is communicated with the jet flow pipe.
The fluid enters the jet pipe to generate jet flow, so that negative pressure is formed at the jet pipe, and the water inlet pipe is communicated with the jet pipe. The liquid at the water inlet pipe is sucked into the centrifugal pump under the action of negative pressure, and the gas in the pump cavity is discharged.
Furthermore, the water inlet pipe is connected with the end part of the jet pipe.
Specifically, the backflow hole and the jet pipe are located on the same axis, and the connection position of the water inlet pipe and the jet pipe is located on the same side as the backflow hole. The fluid entering the jet pipe from the backflow hole generates negative pressure, and the generated negative pressure can suck water flow at the water inlet pipe.
Furthermore, the jet pipe comprises an inlet section, a closing section and an outlet section, and fluid entering the jet pipe sequentially passes through the inlet section, the closing section and the outlet section.
Specifically, the jet pipe in the present invention is not a simple circular pipe structure. The jet pipe is divided into an inlet section, a closing section and an outlet section according to different inner diameter structures of the jet pipe. The inlet section of the jet pipe is the section where the fluid enters the jet pipe firstly. The closing section of the invention is a section of the inner wall surface of the fluid pipe which contracts. The outlet end is the section where the fluid is discharged after passing through the closing section.
Specifically, the water inlet pipe is connected with the inlet section of the jet pipe. The backflow hole is also positioned at the inlet section of the jet pipe.
Furthermore, the inner diameter of the closing-in section is smaller than that of the inlet section, and the inner diameter of the closing-in end is smaller than that of the outlet section.
Specifically, the inner diameter of the inlet section is larger than the inner diameter of the outlet section. The fluid reaching the jet pipe is first introduced in large quantities through an inlet section with a large internal diameter. Then enters the closing section, the inner diameter of the closing section is greatly contracted, the jet speed is improved, and higher negative pressure is obtained. The outlet section is used for discharging the fluid in the jet pipe outwards.
The pump further comprises a water pumping chamber, wherein the water pumping chamber comprises a front cover plate, a rear cover plate and an impeller arranged in the middle, and the impeller rotates to drive fluid in the pump cavity to enter the backflow hole.
The front cover plate and the rear cover plate form a water pumping chamber, and the impeller is positioned in the water pumping chamber. Fluid from the jet pipe can enter a pumping chamber, and the pumping chamber is communicated with the pump cavity. The impeller works, fluid is thrown out by the impeller, and then enters the pump cavity through the water pressing chamber, wherein a part of the fluid enters the jet pipe through the backflow hole to generate jet flow so as to form negative pressure.
Furthermore, the jet pipe is communicated with a water inlet of the pressurized water chamber. The outlet section of the jet pipe is communicated with the pressurized water chamber. Specifically, the impeller and the jet pipe are positioned on the same axis.
Drawings
The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
FIG. 1 is a first usage state diagram of the present invention;
FIG. 2 is a second usage state diagram of the present invention;
fig. 3 is a schematic diagram of the construction of the fluidic tube portion of the present invention.
Wherein the reference numerals are specified as follows: 1. a pump housing; 2. a pump chamber; 3. a jet pipe; 3a, an inlet section; 3b, a closing section; 3c, an outlet section; 4. a water pumping chamber; 5. a return orifice; 6a, a stopper; 6b, a connecting rod; 7. a water inlet pipe; 8. a front cover plate; 9. a rear cover plate; 10. an impeller.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An automatically-adjusted jet type self-priming centrifugal pump is disclosed, as shown in fig. 1 and fig. 2, and comprises a pump shell 1, a jet pipe 3 and an impeller 10, wherein a pump cavity 2 is arranged in the pump shell, the jet pipe 3 is positioned in the pump cavity 2, a backflow hole 5 is arranged on the jet pipe 3, the backflow hole 5 is communicated with the jet pipe 3 and the pump cavity 2, the impeller 10 works to lead part of fluid in the pump cavity 2 to be led into the jet pipe 3 from the backflow hole 5, a stopper 6a is arranged in the pump cavity 2, the fluid moves to drive the stopper 6a to move, and the stopper 6a can be driven to block the backflow hole 5 when the fluid flow is larger than. The stopper 6a is arranged outside the backflow hole 5, and a gap exists between the stopper 6a and the backflow hole 5. I.e. the stopper 6a is under no or low stress, there will be a space between the stopper 6a and the return hole 5, and fluid can pass through the return hole 5. When the stopper 6a is strongly stressed, the stopper 6a is forced to move to the return hole 5, thereby blocking the return hole 5. The invention is provided with the stopper 6a structure to act on the backflow hole 5, the acting force of the movement of the stopper 6a comes from the fluid in the pump cavity 2, and the function of automatically plugging the backflow hole 5 with large flow in the centrifugal pump is realized.
The further preferable scheme of the invention is as follows: the blocking piece 6a is an arc-shaped sheet structural piece, and the inner diameter of the inlet end of the backflow hole 5 is larger than that of the outlet end. The inner wall surface of the backflow hole 5 is in arc transition, the stopper 6a is an arc sheet-shaped structural member, the stopper 6a is protruded towards one side of the backflow hole 5, and the backflow hole 5 is closed when the stopper 6a is attached to the inner wall of the backflow hole 5. The sealing element is matched with the structure of the backflow hole 5, so that a sealing surface with good sealing effect can be provided when the sealing element acts on the inner wall surface of the backflow hole 5. The front surface of the stopper 6a is an arc-shaped convex surface, and then the back surface of the stopper 6a is an arc-shaped concave surface. The fluid entering the return hole 5 can press the stopper 6a against the wall surface of the return hole 5 by biasing the concave surface of the stopper 6 a. Moreover, since the inner diameter of the backflow hole 5 decreases from left to right, the higher the flow rate is, the higher the acting force is applied to the stopper 6a, so that the stopper 6a is pressed against the wall surface of the backflow hole 5 more reliably.
The stopper 6a is arranged on the pump shell 1 or the water inlet pipe 7 through a connecting rod 6b, and the connecting rod 6b can deform under stress. When the flight 6a is subjected to the force exerted by the fluid, the force is transmitted to the link 6 b. The connecting rod 6b is made of elastic material, and the position of the stopper 6a can move when the connecting rod 6b is deformed under stress. The connecting rod 6b is used for installing the stopper 6a, which is one installation mode of the invention, and the invention can also adopt other schemes for installing the stopper 6a, as long as the stopper 6a can extend into the backflow hole 5 by the thrust of the fluid to seal the wall surface of the backflow hole 5.
The invention also comprises a water inlet pipe 7, wherein the water inlet pipe 7 is communicated with the jet pipe 3. The fluid enters the jet pipe 3 to generate jet flow, so that negative pressure is formed at the jet pipe 3, and the water inlet pipe 7 is communicated with the jet pipe 3. The liquid in the water inlet pipe 7 is sucked into the centrifugal pump due to the negative pressure, and the gas in the pump cavity 2 is discharged.
As shown in fig. 3, the backflow hole 5 is arranged at the end of the jet pipe 3, and the inner diameter of the inlet end of the backflow hole 5 is larger than that of the outlet end. The water inlet pipe 7 is connected with the end part of the jet pipe 3. Specifically, the backflow hole 5 and the jet pipe 3 are located on the same axis, and the connection position of the water inlet pipe 7 and the jet pipe 3 is located on the same side as the backflow hole 5. The fluid entering the jet pipe 3 from the return hole 5 will generate negative pressure, and the generated negative pressure can entrain the water flow at the water inlet pipe 7.
As shown in fig. 1, the backflow hole 5 is located at the left end of the jet pipe 3, and the pumping chamber 4 is located at the right end of the jet pipe 3. The pumping chamber 4 operates to guide the fluid in the pump chamber 2 from the right end to the left end, and the fluid reaches the left end and is guided into the jet pipe 3 from the return hole 5. Namely, the fluid flows from the left end to the right end of the jet pipe 3, so as to realize the negative pressure generated by the jet flow. The fluid from the jet pipe 3 is again pushed by the pumping chamber 4 to be guided from the right end to the left end, forming a circulation.
Specifically, as shown in fig. 3, the jet pipe 3 is divided into an inlet section 3a, a closing section 3b, and an outlet section 3c according to the difference in the inner diameter structure of the jet pipe 3, and the fluid entering the jet pipe 3 passes through the inlet section 3a, the closing section 3b, and the outlet section 3c in sequence. The inlet section 3a of the present invention is the section where the fluid enters the jet pipe 3 first. The closing-in section 3b of the invention is a section for contracting the inner wall surface of the fluid pipe. The outlet end is the section where the fluid is discharged after passing through the outlet section 3 b. Specifically, the water inlet pipe 7 is connected with the inlet section 3a of the jet pipe 3. The backflow hole 5 is also positioned at the inlet section 3a of the jet pipe 3.
The inner diameter of the closing section 3b is smaller than that of the inlet section 3a, so that the fluid reaching the jet pipe 3 firstly passes through the inlet section 3a with a large inner diameter to introduce a large amount of fluid. Then enters the closing section 3b, the inner diameter of the closing section 3b is greatly contracted, the jet speed is improved, and higher negative pressure is obtained. The outlet section 3c is used for discharging the fluid in the jet pipe 3. The inner diameter of the outlet end is smaller than that of the outlet section 3 c.
As shown in fig. 1 and 2, the present invention further comprises a pumping chamber 4, wherein the pumping chamber 4 comprises a front cover plate 8, a rear cover plate 9, and an impeller 10 mounted in the middle, and the impeller 10 rotatably drives the fluid in the pump chamber 2 into the return hole 5. The front cover plate 8 and the rear cover plate 9 form a water pumping chamber 4, and the impeller 10 is positioned in the water pumping chamber 4. The jet pipe 3 is communicated with a water inlet of the pressurized water chamber 4, specifically, an outlet section 3c of the jet pipe 3 is communicated with the pressurized water chamber 4, and the impeller 10 and the jet pipe 3 are positioned on the same axis. Fluid from the jet pipe 3 can enter the pumping chamber 4, and the pumping chamber 4 is communicated with the pump chamber 2. The impeller 10 works, fluid is thrown out by the impeller 10, and then enters the pump cavity 2 through the water pressing chamber 4, wherein a part of the fluid enters the jet pipe 3 through the backflow hole 5 to generate jet flow to form negative pressure.
The impeller 10 of the present invention works to throw the fluid from the jet pipe 3 out to the pump cavity 2, and part of the fluid in the pump cavity 2 is led into the jet pipe 3 through the return hole 5. In the self-priming process of the centrifugal pump, the fluid in the pump cavity 2 is a gas-liquid mixture, the impact force on the stopper 6a is small, and the force of the fluid on the stopper 6a is not enough to drive the stopper 6a to block the backflow hole 5. Namely, the return hole 5 is in an open state, the fluid enters the jet pipe 3 to generate jet flow, so that negative pressure is formed, the negative pressure realizes that the liquid at the water inlet pipe 7 of the centrifugal pump is sucked into the centrifugal pump, and the gas in the pump cavity 2 is continuously discharged, so that self-priming is gradually completed.
After the self-priming is completed, the medium in the pump cavity 2 is water. When the flow rate of the fluid is less than the predetermined value, the impact force of the fluid on the stopper 6a is not enough to drive the stopper 6a to block the backflow hole 5, i.e., the backflow hole 5 is in an open state. The flow velocity of the fluid entering the jet pipe 3 is small, the negative pressure is small, and the cavitation phenomenon can not occur. When the flow rate of the fluid is greater than the predetermined value, the impact force of the fluid on the stopper 6a is greater, and the stopper 6a is driven to block the backflow hole 5, so that the backflow hole 5 is closed. At the moment, the fluid in the pump cavity 2 can not enter the jet pipe 3 through the backflow hole 5, so that the flow rate in the jet pipe 3 is reduced, and the cavitation phenomenon and the noise brought therewith are avoided. The friction loss in the jet pipe 3 and the pump cavity 2 is effectively reduced, and the efficiency of the pump is improved.
The present invention provides a flight 6a that is capable of moving as the fluid moves. During the self-priming process of the centrifugal pump, the stopper 6a does not act on the backflow hole 5, the backflow hole 5 is opened, and the centrifugal pump finishes the self-priming operation. After the self-priming is completed, if the flow is large, the flow rate in the jet pipe 3 is large, the generated negative pressure is also large, a large amount of water enters the jet pipe 3 through the backflow hole 5 in the pump cavity 2, the cavitation phenomenon and the accompanying noise are easy to occur, and the hydraulic friction loss in the jet pipe 3 is large. However, the stopper 6a is arranged, and the stopper 6a acts on the backflow hole 5 when the flow rate is large, so that the backflow hole 5 is closed, and water in the pump cavity 2 cannot enter the jet pipe 3 through the backflow hole 5. Thereby remarkably reducing the flow velocity in the jet pipe 3 and avoiding cavitation and the accompanying noise.
The present invention has been described in detail, and the principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the present invention and the core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The jet type self-priming centrifugal pump is characterized in that a backflow hole (5) is formed in the jet pipe (3), the backflow hole (5) is communicated with the jet pipe (3) and the pump cavity (2), the power part works to enable part of fluid in the pump cavity (2) to be led into the jet pipe (3) from the backflow hole (5), a movable blocking piece (6a) is arranged in the pump cavity (2), a distance exists between the blocking piece (6a) and the backflow hole (5), and the fluid with the flow rate larger than a preset value can drive the blocking piece (6a) to block the backflow hole (5).
2. The self-priming centrifugal pump of the self-adjusting jet type according to claim 1, characterized in that the inner diameter of the inlet end of the backflow hole (5) is larger than the inner diameter of the outlet end, and the inner wall surface of the backflow hole (5) is in arc transition.
3. The self-priming centrifugal pump with jet flow type of automatic adjustment as claimed in claim 1, wherein the stopper (6a) is an arc-shaped sheet structure, the stopper (6a) protrudes towards one side of the backflow hole (5), and the backflow hole (5) is closed when the stopper (6a) is attached to the inner wall of the backflow hole (5).
4. The self-priming centrifugal pump of the self-adjusting jet type according to claim 1, characterized in that the back-flow hole (5) is provided at one side end of the jet pipe (3), and the power member is located at the other side of the jet pipe (3).
5. The self-priming centrifugal pump of the self-adjusting jet type according to any one of claims 1 to 4, characterized by further comprising a water inlet pipe (7), wherein the water inlet pipe (7) is communicated with the jet pipe (3), the water inlet pipe (7) is connected with the end of the jet pipe (3), and the water inlet pipe (7) and the return hole (5) are located on the same side.
6. The self-priming centrifugal pump with self-adjusting jet according to any of claims 1 to 4, characterized in that the return orifice (5) is located on the same axis as the jet pipe (3), the power element comprises an impeller (10), and the impeller (10) is located on the same axis as the jet pipe (3).
7. The self-priming centrifugal pump of the jet type with automatic regulation according to any of the claims 1 to 4, characterized in that the stopper (6a) is mounted on the pump casing (1) or the intake pipe (7) by a connecting rod (6b), the connecting rod (6b) being deformable by force.
8. The self-priming centrifugal pump of the self-regulating jet type according to claim 1, characterized in that the jet pipe (3) comprises an inlet section (3a), a closing section (3b) and an outlet section (3c), and the fluid entering the jet pipe (3) will pass through the inlet section (3a), the closing section (3b) and the outlet section (3c) in sequence.
9. Self-priming centrifugal pump of the jet type with automatic regulation according to claim 8, characterized in that the internal diameter of the outlet section (3b) is smaller than the internal diameter of the inlet section (3a) and the internal diameter of the outlet section (3 c).
10. The self-priming centrifugal pump with jet flow type capable of being automatically adjusted according to claim 1 is characterized by further comprising a water pumping chamber (4), wherein the water pumping chamber (4) comprises a front cover plate (8) and a rear cover plate (9), an impeller (10) is positioned in the water pumping chamber (4), and the impeller (10) rotates to drive fluid in the pump cavity (2) to enter the backflow hole (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110320599.7A CN113007101A (en) | 2021-03-25 | 2021-03-25 | Jet type self-priming centrifugal pump capable of being automatically adjusted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110320599.7A CN113007101A (en) | 2021-03-25 | 2021-03-25 | Jet type self-priming centrifugal pump capable of being automatically adjusted |
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| Publication Number | Publication Date |
|---|---|
| CN113007101A true CN113007101A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110320599.7A Pending CN113007101A (en) | 2021-03-25 | 2021-03-25 | Jet type self-priming centrifugal pump capable of being automatically adjusted |
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| CN (1) | CN113007101A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023029378A1 (en) * | 2021-08-30 | 2023-03-09 | 陈荣国 | Self-suction type multi-stage composite canned motor pump |
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| CN2292927Y (en) * | 1996-07-31 | 1998-09-30 | 吴继忠 | Self priming pump for sprinkling irrigation |
| ITVI980028A1 (en) * | 1998-02-13 | 1999-08-13 | Calpeda A Spa | SELF-PRIMING EJECTOR PUMP WITH FLOW CONTROL DEVICE |
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Application publication date: 20210622 |