EP4191065B1 - Bewässerungspumpe - Google Patents

Bewässerungspumpe Download PDF

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Publication number
EP4191065B1
EP4191065B1 EP21212039.8A EP21212039A EP4191065B1 EP 4191065 B1 EP4191065 B1 EP 4191065B1 EP 21212039 A EP21212039 A EP 21212039A EP 4191065 B1 EP4191065 B1 EP 4191065B1
Authority
EP
European Patent Office
Prior art keywords
valve
spring
pump
valve body
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21212039.8A
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English (en)
French (fr)
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EP4191065A1 (de
Inventor
Florian SOOR
Tobias DEMMELMAIER
Sebastian Neuburger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Husqvarna AB
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Husqvarna AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husqvarna AB filed Critical Husqvarna AB
Priority to EP21212039.8A priority Critical patent/EP4191065B1/de
Priority to CN202211425872.3A priority patent/CN116221126A/zh
Publication of EP4191065A1 publication Critical patent/EP4191065A1/de
Application granted granted Critical
Publication of EP4191065B1 publication Critical patent/EP4191065B1/de
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Classifications

    • 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
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves

Definitions

  • the present disclosure relates to a watering pump, and more specifically to a valve assembly for the watering pump.
  • Self-priming centrifugal pumps are widely used for enabling water supply in applications such as gardening among others.
  • One of the important functions of such a pump is suction of water.
  • Such pumps are designed to work with water as a medium and not air. Therefore, the pump requires to be filled with water before the start of the pump.
  • the pump defines a suction side towards the inlet and a pressure side towards the outlet. Through the pumping process, water from the suction side is transported to the pressure side, which creates a negative pressure on the suction side. This process may also induce air from the suction side to the pressure side.
  • it is imperative that majority of flow medium should be water, as the pump is designed for flow of water.
  • such pumps are equipped with a suction valve.
  • the suction valve has a backflow opening and a valve body with a compression spring. When unloaded, the suction valve is open.
  • the pumped water flows around the valve body, re-enters the suction side of the pump and can be pumped again by the pump and moved to the pressure side.
  • the suction side builds up a negative pressure by the pumping of a water-air mixture and a separation of the air on the pressure side.
  • there is a flow that passes the suction valve This creates a flow pressure gradient between the areas before and after the valve body.
  • a special case is an operating point with a very low flow rate in combination with a closed valve. Due to air separation of the pumped medium, air accumulates on the suction side of the pump. The low flow rate and the resulting low flow velocity cannot transport this air to the pressure side. Further, too much air on the suction side may leads to collapse of the hydraulics of the pump. This phenomenon may be counteracted by an additional back flow opening.
  • the additional backflow opening provides a permanent back flow between the pressure side and the suction side and removes the separated air. However, the additional backflow opening leads to a permanent loss of hydraulic power which is highly undesirable.
  • the '850 reference discloses a runner body structure of a garden pump.
  • the garden pump includes a backward flow hole that further includes a valve member.
  • the valve member includes a spring that operates based on the pressure on the pump. The valve member maintains the flow rate of water inside the pump by actuation of the spring.
  • the '850 reference seems short of addressing the issues faced during low flow rate, and low flow velocity which are discussed previously. Further examples are provided in EP 1 729 009 A1 and JP S51 51003 A .
  • the objective is at least partially achieved by a pump.
  • the pump has a body which defines an inlet and an outlet to allow flow of a liquid.
  • the pump has a suction side around the inlet and a pressure side around the outlet.
  • the pump has an impeller positioned downstream of the inlet.
  • the pump defines a backflow opening.
  • the backflow opening is in fluid communication with the inlet and the outlet.
  • the pump includes a first valve.
  • the first valve is operatively coupled with the backflow opening such that the first valve selectively opens the backflow opening.
  • the first valve has a first end and a second end.
  • the first valve further includes a first valve housing.
  • a first valve body is biasingly coupled by a first spring within the first valve housing around the second end. Based on the operating conditions, the first valve body moves the first spring between a first compressed state and a first uncompressed state. The first valve body moves the first spring to the first compressed state to disallow flow of the liquid through the first valve, and the first valve body moves the first spring to a first uncompressed state to allow flow of the liquid through the first valve.
  • the pump is characterized in that a second valve is provided within the first valve.
  • the second valve has a second valve body such that the second valve body is biasingly coupled by a second spring within the first valve body. Based on the operating conditions, the second valve body moves the second spring between a second compressed state and a second uncompressed state. The second valve body moves the second spring to the second compressed state to allow flow of the liquid through the second valve, and the second valve body moves the second spring to the second uncompressed state to disallow flow of the liquid through the second valve.
  • Such an arrangement of multiple valves i.e., the first valve and the second valve allows suction and stable pumping characteristics without permanent losses of pump power due to permanently opened backflow openings.
  • the improved valve system allows for optimal adaptation of the valve to a desired performance curve of the pump through the two springs i.e., the first spring, and the second spring. Additionally, the valve will require lesser space, and lesser number of parts due to placement of the second valve within the first valve as same parts are carrying out more than one functions.
  • the first valve body acts as housing for the second valve.
  • the first valve is a suction valve
  • the second valve is a pressure valve
  • the second valve is disposed within the first valve between the first compression spring and the first valve body. This arrangement allows the first valve body to act as a valve housing for the second valve. Such a structural system permits usage of lesser number of parts as existing parts carry out dual functions.
  • the second valve reciprocates within the first valve body, based on a pressure acting on the second compression spring. Based on operational conditions, the second valve is actuated through the pressure acting on the second spring through the second valve body. Reciprocation of the second valve within the first valve body provides for actuation of the second valve in case of very high pressure on the second valve. In such a case, the second valve remains open, and the first valve remains closed.
  • the first valve body defines a pressure opening around the first end of the first valve.
  • the pressure opening of the first valve body allows fluid flow, such that the second valve body moves the second spring between the second compressed state, and the second uncompressed state. Movement of the second spring between the second compressed state and the second uncompressed state respectively closes and opens the second valve.
  • the pressure opening allows the valve body to take up the pressure and apply adequate forces on the second compression spring for actuation purposes.
  • the pump is a centrifugal pump.
  • Centrifugal pumps may utilize the described valve system quite efficiently and reduce the permanent operating power losses due to multiple backflow openings.
  • FIG. 1 illustrates a pump 100.
  • the pump 100 may be any type of a pump.
  • the pump 100 is a centrifugal pump.
  • the pump 100 is used to transport a liquid such as water or any other such liquid.
  • the liquid will be considered as water.
  • the pump 100 has a body 102 defining an inlet 104 and an outlet 106 to allow flow of the liquid.
  • the fluid enters the pump 100 through the inlet 104 and exits the pump 100 through the outlet 106.
  • the pump 100 defines a suction side "S" and a pressure side "P".
  • the suction side "S” is defined around the inlet 104 and the pressure side "P" is defined around the outlet 106.
  • the pump 100 further includes an impeller 108.
  • the impeller 108 is positioned downstream of the inlet 104.
  • the impeller 108 when in motion, displaces water to augment flow of water from the inlet 104 to the outlet 106.
  • the pump 100 further includes a backflow opening 110 in fluid communication with the inlet 104 and the outlet 106.
  • the backflow opening 110 provides a channel for the water to flow back from the pressure side "P" to the suction side "S".
  • a valve 200 (shown in FIGS. 2A , B) is operatively coupled with the backflow opening 110. The valve 200 operates to selectively open the backflow opening 110.
  • FIGS. 2A and 2B demonstrate structural details of the valve 200 as known conventionally.
  • the valve 200 has a first end 202 and a second end 204.
  • the valve 200 defines a valve housing 206.
  • the valve 200 further includes a valve body 208.
  • the valve body 208 is biasingly coupled by a spring 210 within the valve housing 206.
  • the valve body 208 is coupled by the spring 210 around the second end 204 of the valve 200.
  • the spring 210 may move between a compressed state and an uncompressed state.
  • FIG. 2A illustrates the spring 210 in the uncompressed state
  • FIG. 2B illustrates the spring in the compressed state.
  • the valve body 208 moves the spring 210 to the compressed state to disallow flow of water through the valve 200. Further, the valve body 208 moves the spring 210 to the uncompressed state to allow flow of water through the valve 200.
  • the spring 210 is in the uncompressed state and the valve 200 is open.
  • water being pumped by the pump 100 flows around the valve body 208.
  • the pumped water may flow around the valve body 208 and reenter the suction side "S" of the pump 100.
  • This pumped water may be pumped again and moved to the pressure side "P" of the pump 100.
  • a water air mixture is being pumped from the suction side "S”.
  • the air from the water air mixture gets separated on the pressure side "P”. Due to this, a negative pressure builds up towards the suction side "S”.
  • a flow of water starts passing the valve 200.
  • the flow pressure gradient creates a resulting force which acts against the spring 210 and biases the valve body 208 to move the spring 210 towards the compressed state, as shown in FIG. 2B .
  • pressures “ P1 ", “P2”, “P3”, and “P4" are used to show pressure, and forces inside the valve 200, and valve 300 based upon flow of the liquid (illustrated with dashed lines), spring forces (illustrated with left solid line arrow in the present figures), related to the spring 210, a first spring 310, and a second spring 316, and resultant force based on the liquid flow and the spring force (illustrated with right solid line arrow in the present figures).
  • a higher pressure " P1 " around the pressure side "P”, compared to pressure “P2" around the suction side “S” i.e., “ P1 " > “P2”, allows actuation of the valve body 208 to moves the spring 210 to the compressed state (shown in FIG. 2B ) to disallow flow of water through the valve 200.
  • the solid arrow around the valve body 208 is illustrated as having a larger size to indicate movement of the valve body 208 to move the spring 210 to the compressed state as shown in FIG. 2B .
  • FIG. 3 illustrates structural details of a valve 300 as per the present disclosure.
  • the valve 300 as per the present disclosure shall be referred to as a first valve 300 henceforth.
  • the first valve 300 has a first end 302 and a second end 304.
  • the first valve 302 defines a first valve housing 306.
  • the first valve 300 further includes a first valve body 308.
  • the first valve body 308 is biasingly coupled by the first spring 310 within the first valve housing 306.
  • the first valve body 308 is coupled by the first spring 310 around the second end 304 of the first valve 300.
  • the first spring 310 may move between a first uncompressed state and a first compressed state.
  • the first valve body 308 may move the first spring 310 to the first uncompressed state to allow flow of water through the first valve 300.
  • the first valve body 308 may move the first spring 310 to the first compressed state to disallow flow of water through the first valve 300.
  • FIG. 3 shows the first spring 310 in the uncompressed state
  • the pump 100 further includes a second valve 312 disposed within the first valve 300.
  • the first valve body 308 acts as a valve housing for the second valve 312.
  • the second valve 312 is disposed within the first valve 300 between the first spring 310 and the first valve body 308.
  • the second valve 312 further includes a second valve body 314 and a second spring 316.
  • the second valve body 314 is biasingly coupled by the second spring 316 within the first valve body 308.
  • the second spring 316 may move between a second uncompressed state and a second compressed state.
  • the second valve body 314 may move the second spring 316 to the second uncompressed state to disallow flow of water through the second valve 312.
  • the second valve body 314 may move the second spring 316 to the second compressed state to allow flow of water through the second valve 300.
  • FIGS. 3 and 4 both show the second spring 316 in the uncompressed state.
  • the first valve 300 is a suction valve
  • the second valve 312 is a pressure valve, in some embodiments. Such a combination may allow to achieve better performance results for the pump 100 and reduce losses which may otherwise happen due to a permanent backflow opening.
  • water starts flowing from the inlet 104 and flows out through the outlet 106.
  • flow of water creates pressure difference or flow pressure gradient across the first valve body 308. Due to this, forces act on the first valve body 308 and the first valve body 308 moves towards the second end 304 from the first end 302. This movement is actuated by overcoming of the force applied on the first valve body 308 by the first spring 310 through the forces acting due to the flow pressure gradient on the first valve body 308.
  • FIG. 4 shows the first valve 308 body in an intermediate position between the first end 302 and the second end 304. In this position, the flow rate is reduced compared to when the first valve body 308 is at the first end 302.
  • the first valve 300 is partially open, and the second valve 312 is fully closed.
  • the first valve body 308 reaches the first end 302 as shown in FIG. 5 .
  • the first valve 300 is fully closed now and does not allow any flow of water at all.
  • the second valve 312 is still fully closed.
  • the second valve 312 gets actuated.
  • the threshold value may depend upon various factors such as compression coefficient of the second spring 316, material composition of the second valve body 314 among others.
  • actuation of the second valve 312 depends upon forces, herein the pressure "P4" around the first valve body 308, being applied on the second valve body 314.
  • the second valve body 314 experiences two opposing forces.
  • One of the forces is the compression force applied by the second spring 316 (illustrated by left solid arrow) on the second valve body 314.
  • the first valve body 308 defines a pressure opening 318 towards the first end 302 of the first valve 300.
  • Other force i.e., the pressure "P4" is being applied due to the pressure on the pressure side "P" through the pressure opening 318.
  • the pressure "P4" > the pressure "P3" leading to movement or actuation of the second valve body 314 of the second valve 312.
  • This movement of the second valve body 314 allows flow of the liquid, as illustrated by dashed arrow from the pressure opening 318 through around the second valve body 314 of the second valve 312 towards the backflow opening 110 (shown in FIG. 1 ) of the valve 300.
  • the present disclosure refers to the backflow opening 110 which for the reference of the valve 300 of the present disclosure may be provided around the second end 304 of the valve 300.
  • the pressure opening 318 of the first valve body 308 allows fluid flow, such that the second valve body 314 moves the second spring 316 between the second compressed state (refer FIG. 6 ), and the second uncompressed state (refer FIG. 5 ). Movement of the second spring 316 between the second compressed state and the second uncompressed state respectively opens and closes the second valve 312.
  • the pressure opening 318 allows the second valve body 314 to take up the pressure and apply adequate forces on the second spring 316 for actuation purposes.
  • the second valve body 314 moves against the biasing force of the second spring 316 and the second valve 312 opens, as shown in FIG. 6 .
  • the second valve 312 reciprocates within the first valve body 308, based on the pressure acting on the second spring 316.
  • Reciprocation of the second valve 312 within the first valve body 308 provides for actuation of the second valve 312 in case of very high pressure on the second valve 312.
  • the second valve 312 remains open, and the first valve 300 remains closed.
  • water flows through the pressure opening 318, and around the second valve body 314 to enter the suction side "S".
  • backflow of water is achieved in closed state of the first valve 300 as well.
  • the first valve 300 and the second valve 312 together allow for optimal adaptation of operation of the pump 100 to a desired performance curve of the pump 100 through adjustments made via the first spring 310 and the second spring 312.
  • the present disclosure allows fine tuning of performance of the pump 100 which may be easily achieved through adjustments in compression coefficients of the first spring 310 and the second spring 316. Factors such as different operating conditions, different stages of wear and tear of the pump 100, and different water quality may also be taken care of by adjusting the first spring 310 and the second spring 316 without incurring heavy cost and efforts.
  • the pump 100 will require lesser space, and lesser number of parts due to placement of the second valve 312 within the first valve 300 as same parts are carrying out more than one functions.
  • the first valve body 308 acts as a valve housing for the second valve 312.
  • the present disclosure provides an improved pump 100 which is able to overcome the problems discussed regarding conventional pumps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Claims (7)

  1. Eine Pumpe (100), die Folgendes umfasst:
    einen Körper (102), der einen Einlass (104) und einen Auslass (106) definiert, um den Durchfluss einer Flüssigkeit zu ermöglichen, wobei die Pumpe (100) eine Saugseite (S) um den Einlass (104) und eine Druckseite (P) um den Auslass (106) aufweist;
    ein Laufrad (108), das stromabwärts des Einlasses (104) angeordnet ist;
    eine Rückflussöffnung (110) in Fluidverbindung mit dem Einlass (104) und dem Auslass (106); und
    ein erstes Ventil (300), das betriebsmäßig mit der Rückflussöffnung (110) gekoppelt ist, um die Rückflussöffnung (110) selektiv zu öffnen, wobei das erste Ventil (300) ein erstes Ende (302) und ein zweites Ende (304) definiert, und
    wobei das erste Ventil (300) ein erstes Ventilgehäuse (306) aufweist, wobei ein erster Ventilkörper (308) durch eine erste Feder (310) innerhalb des ersten Ventilgehäuses (306) um das zweite Ende (304) vorgespannt gekoppelt ist, und
    wobei der erste Ventilkörper (308) eingerichtet ist, die erste Feder (310) in einen ersten zusammengedrückten Zustand zu bewegen, um den Fluss der Flüssigkeit durch das erste Ventil (300) zu verhindern, und der erste Ventilkörper (308) eingerichtet ist, die erste Feder (310) in einen ersten nicht zusammengedrückten Zustand zu bewegen, um den Fluss der Flüssigkeit durch das erste Ventil (300) zu ermöglichen;
    dadurch gekennzeichnet, dass:
    ein zweites Ventil (312), das innerhalb des ersten Ventils (300) angeordnet ist, wobei das zweite Ventil (312) einen zweiten Ventilkörper (314) aufweist, wobei der zweite Ventilkörper (314) durch eine zweite Feder (316) innerhalb des ersten Ventilkörpers (308) vorgespannt gekoppelt ist,
    wobei der zweite Ventilkörper (314) eingerichtet ist, die zweite Feder (316) in einen zweiten zusammengedrückten Zustand zu bewegen, um einen Fluss der Flüssigkeit durch das zweite Ventil (312) zu ermöglichen, und der zweite Ventilkörper (314) eingerichtet ist, die zweite Feder (316) in einen zweiten nicht zusammengedrückten Zustand zu bewegen, um einen Fluss der Flüssigkeit durch das zweite Ventil (312) zu verhindern.
  2. Die Pumpe (100) nach Anspruch 1, wobei das erste Ventil (300) ein Saugventil und das zweite Ventil (312) ein Druckventil ist.
  3. Die Pumpe (100) nach Anspruch 1 oder 2, wobei das zweite Ventil (312) innerhalb des ersten Ventils (300) zwischen der ersten Feder (310) und dem ersten Ventilkörper (308) angeordnet ist.
  4. Die Pumpe (100) nach einem der Ansprüche 1 bis 3, wobei sich das zweite Ventil (312) innerhalb des ersten Ventilkörpers (308) auf der Grundlage eines auf die zweite Feder (316) wirkenden Drucks hin- und herbewegt.
  5. Die Pumpe (100) nach einem der Ansprüche 1 bis 4, wobei der erste Ventilkörper (308) eine Drucköffnung (318) um das erste Ende (302) des ersten Ventils (300) definiert.
  6. Die Pumpe (100) nach Anspruch 5, wobei die Drucköffnung (318) des ersten Ventilkörpers (308) einen Fluidstrom ermöglicht, so dass der zweite Ventilkörper (314) die zweite Feder (316) zwischen dem zweiten zusammengedrückten Zustand und dem zweiten nicht zusammengedrückten Zustand bewegen kann.
  7. Die Pumpe (100) nach einem der vorhergehenden Ansprüche, wobei die Pumpe (100) eine Kreiselpumpe ist.
EP21212039.8A 2021-12-02 2021-12-02 Bewässerungspumpe Active EP4191065B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP21212039.8A EP4191065B1 (de) 2021-12-02 2021-12-02 Bewässerungspumpe
CN202211425872.3A CN116221126A (zh) 2021-12-02 2022-11-15 浇水泵

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21212039.8A EP4191065B1 (de) 2021-12-02 2021-12-02 Bewässerungspumpe

Publications (2)

Publication Number Publication Date
EP4191065A1 EP4191065A1 (de) 2023-06-07
EP4191065B1 true EP4191065B1 (de) 2024-01-17

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Application Number Title Priority Date Filing Date
EP21212039.8A Active EP4191065B1 (de) 2021-12-02 2021-12-02 Bewässerungspumpe

Country Status (2)

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EP (1) EP4191065B1 (de)
CN (1) CN116221126A (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5151003A (ja) * 1974-10-30 1976-05-06 Hitachi Ltd Asaidohonpu
EP1729009B1 (de) * 2005-05-31 2007-07-11 Pedrollo S.p.a. Kreiselpumpe
CN206144850U (zh) 2016-09-30 2017-05-03 利欧集团浙江泵业有限公司 花园泵的流道体结构

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CN116221126A (zh) 2023-06-06
EP4191065A1 (de) 2023-06-07

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