US3602611A - Pump assembly composed of two pump units arranged in a casing - Google Patents

Pump assembly composed of two pump units arranged in a casing Download PDF

Info

Publication number
US3602611A
US3602611A US875639A US3602611DA US3602611A US 3602611 A US3602611 A US 3602611A US 875639 A US875639 A US 875639A US 3602611D A US3602611D A US 3602611DA US 3602611 A US3602611 A US 3602611A
Authority
US
United States
Prior art keywords
pump
discharge opening
passage
pump units
outlet
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.)
Expired - Lifetime
Application number
US875639A
Other languages
English (en)
Inventor
Jochen Oplander
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3602611A publication Critical patent/US3602611A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type

Definitions

  • Striker ABSTRACT There is disclosed a pump assembly composed of two pump units which are separately capable of being driven and which are arranged in a casing provided with one inlet and one outlet only, said pump assembly being characterized by the intake sockets of the pump units being disposed at locations of which one is downstream of the other at a duct means coextensive from the inletto the outlet of said casing, the pressure side of each pump unit opening into the same cut means respectively downstream of the associated intake sockets thereof, and a means being provided at the discharge of each pump unit preventing a backflow of the fluid pumped by said pump unit in said duct means.
  • This invention relates to a pump assembly composed of two pump units which are separately driven and which are arranged in a casing having only one inlet and only one outlet. Such a pump assembly is particularly suited for recirculating the water in heating systems.
  • Pump assemblies of this type are conventional in which the pump units operate individually as well as together concurrently so that they supply twice the water rating when simultaneously operating.
  • an arrangement is conventional which includes a valve shutting a duct leading to the other pump unit when using one pump unit only and opening the ducts of both pump units when concurrently using both pump units (see German Patent 954,757).
  • the rating of the water to be recirculated In heating systems in residential buildings including a plurality of apartments, e.g. apartment buildings, the rating of the water to be recirculated generally extremely varies with time, and in particular the water rating to be recirculated temporarily is very low because the majority of all heating bodies has been disconnected from circulation. In this event, this results in a rise in the water pressure related to the decrease in the water rating when using water circulating pumps of the type referred to hereinbefore, and this also applies for the case that for the high rating both pump units of the assembly are permitted to operate concurrently and that for the low rating only one pump unit is permitted to operate. This rise in the water pressure is undesirable, because it can result in operating noise due to the resultant increase in the water velocity.
  • a closure means is provided at the discharge of each pump unit opening upon being subjected to the flow pressure of the water pumped by the pump.
  • a closure means can be provided in the duct downstream of the intake socket of each pump unit. Said closure means may comprise a flap.
  • the means for preventing a backflow can, as an alternative, also be provided operating in the principle of a jet pump.
  • the shafts of both pump units may be positioned on a common plane perpendicular to said duct means, a feature facilitating machining operations in the manufacture of the assembly.
  • FIG. 1 is a diagrammatic sectional view of a pump assembly illustrating a first embodiment of the invention.
  • FIG. 2 is a diagrammatic. sectional view of a pump assembly illustrating a second embodiment of the invention.
  • two centrifugal pumps 4 and the impellers of which are denominated with 4a or 5a are built into a casing 1 having an inlet 2 at one end and an outlet 3 at the other end in a manner that their shafts 4b, 5b are perpendicular to the longitudinal axis of the casing and are disposed in a common plane.
  • the intake sockets 40, 5c of the pumps 4 and 5 open into the duct la extending straightly from the inlet 2 to the outlet 3 of the casing 1.
  • Each pump is surrounded by a pump casing 6 or 7 disposed inside the casing 1, said pump casing 6 or 7 being closed except for an opening 8 or 9.
  • the outlet of the pumps 4 and 5 thus opens into the interior of the casing 8 or 9.
  • the opening 8 or 9 is capable of being closed by a flap 10 or 11 pivotable about a point of intersection 12 or 13.
  • Two abutments 14a, 14b or 15a, 15b are provided at the casing l for each flap such that the opening 8 is closed by the flap 10 when abutting the abutment 14a, whereas it closes the duct la when abutting the abutment 14b.
  • the flap ll closes the duct la when abutting the abutment 15b, and it closes the opening 9 when abutting the abutment 15a.
  • the driving motor 4d or 5d of the pumps 4 or 5 is mounted on the shafts 4b or 5b. Each of the motors can be started or stopped independently of the other motor.
  • this assembly is thus: when the motor 5d is operating only, thus the pump 5 is running only, the pump 5 draws water through the inlet 2 and the intake socket 5c and presses it into the interior of the pump casing 7 by means of the centrifugal impeller 5a. As a result of the water pressure obtained therein, the flap 11 is pivoted into the position in which it abuts the abutment 15b. The water pumped by the pump 5 therefore flows through the duct 1a to the outlet 3 of the casing 1. Since the pump 4 is not running, the flap I0 is pivoted into the illustrated position as a result of the water pressure existing in the duct la, the flap in this position abutting the abutment 14a. The interior of the pump casing 6 therefore is disconnected from the duct la.
  • the position of the flaps 10 and 11 changes such that they assume the positions illustrated in phantom, i.e. such that the flap 10 abuts the abutment 14b and the flap ll abuts the abutment 15a.
  • the pump thus draws the water through the duct la from the inlet 2 through its intake socket 4c, while the flap l0 separatesthe intake socket 4c from the outlet 3 of the casing.
  • the flap ll disconnects the casing 7 of the inoperative pump 5.
  • both pumps 4 and 5 operate at the same time, the flap 11 is brought into engagement with the abutment 15b, and the flap 10 is brought into engagement with the abutment 14b as a result of the water pressure the two flaps are subjected to.
  • the two pumps are then operating in series.
  • the pumped amount of water is raised virtually by twice the rating.
  • a rise in the pressure is obtained as long as both pumps operate concurrently. If one of the pumps is Stopped, however, as soon as the water demand drops below a predetermined limit, a water pressure is obtained which is much lower.
  • FIG. 1 a backflow of the water pumped by one of the pumps is prevented by a flap
  • FIG. 2 an arrangement is illustrated in which this is prevented by employing the principle of a jet-type pump.
  • the formation of the casing l and the formation and arrangement of the pumps 4 and 5 together with their motors 4d, 5d and their pump casings 6 and 7 is fundamentally similar to that illustrated in FIG. 1.
  • the pump casing 6 or 7 terminates in a jet-type end 16 or 17 in direction of the flow, said end being surrounded by a corresponding jet-type constriction 18 or 19 of the respective portion of the duct 1a.
  • the pump 4 is running only, the water is drawn from the inlet 2 of the casing by means of the intake socket 40 through the jet-type portion 19 into the centrifugal impeller 4a of the pump 4 and pumped through the portions 16 and 18 to the outlet 3.
  • the shape of the portions 16 and 18 a backflow from the portion 16 into the duct la is prevented.
  • the pump is running only. if both pumps 4 and 5 are running, they are connected in series similar to the arrangement of FIG. 1.
  • the pump 4 and 5 of the embodiments shown in FIG. 1 and 2 can for instance generally be permitted to run at the same time, and then one of the pumps can be stopped in the event the water demand drops below a predetermined limit. This stopping can be done either manually or automatically. If the water demand regularly drops below a predetermined rating at predetermined times, for instance at night, one of the two pumps can be stopped by means of a clock at a predetermined time of the night, and it can be started again at a predetermined time of the morning.
  • the stopping and starting of the pump can be made dependent on the water quantity flowing through the pump assembly; for instance, one pump can be constantly connected with the current mains, while the other pump is connected with the current mains through a switch operated by a measuring instrument measuring the water flow through the pump assembly or measuring a pressure differential across the pump assembly.
  • a pump assembly comprising a casing having an inlet and an outlet and a passage connecting said inlet and said outlet for flow of fluid from the former to the latter; a pair of pump units communicating with said passage at longitudinally spaced portions thereof, each of said pump units having an intake opening and a discharge opening of which the latter communicates with said passage downstream of the former; and closure means in the region of said discharge opening of each of said pump units for preventing the backflow of fluid discharged from the respective discharge opening, said closure means comprising respective flaps each mounted for movement under the influence of fluid pumped by the associated pumping unit from one terminal position blocking the respective discharge opening to an other terminal position unblocking such discharge opening and blocking said passage intermediate the respective discharge opening and the associated intake opening.
  • a pump assembly comprising a casing having an inlet and an outlet, and a passage connecting said inlet and said outlet for flow of fluid from the former to the latter; a pair of pump units communicating with said passage at longitudinally spaced portions thereof, each of said pump units having an intake opening and a discharge opening of which the latter communicates with said passage downstream of the former; and closure means in the region of said discharge opening of each of said pump units for preventing the backflow of fluid discharged from the respective discharge opening said closure means comprising respective flaps each associated with one of said pump units and mounted downstream of said intake opening thereof for movement between one terminal position blocking the associated discharge opening and an other terminal position unblocking such discharge opening and blocking said passage.
  • a pump assembly comprising a casing having an inlet and an outlet, and a passage connecting said inlet with said outlet for flow of fluid from the former to the latter, a pair of pump units communicating with said passage at longitudinally spaced portions thereof, each of said pump units having an intake opening and a discharge opening of which the latter communicates with said passage downstream of the former; and
  • respective means operative in the manner of a jet pump and each having a nozzle portion receiving fluid from a respective discharge opening for discharging such fluid along and in downstream direction of said passage and a flow-constricting portion surrounding the nozzle portion, for preventing a backflow of fluid pumped by the respective pump units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
US875639A 1968-11-12 1969-11-12 Pump assembly composed of two pump units arranged in a casing Expired - Lifetime US3602611A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681808411 DE1808411C3 (de) 1968-11-12 1968-11-12 Pumpenaggregat aus zwei in einem gehaeuse angeordneten kreiselpumpen

Publications (1)

Publication Number Publication Date
US3602611A true US3602611A (en) 1971-08-31

Family

ID=5713089

Family Applications (1)

Application Number Title Priority Date Filing Date
US875639A Expired - Lifetime US3602611A (en) 1968-11-12 1969-11-12 Pump assembly composed of two pump units arranged in a casing

Country Status (9)

Country Link
US (1) US3602611A (enrdf_load_stackoverflow)
AT (1) AT295798B (enrdf_load_stackoverflow)
BE (1) BE741398A (enrdf_load_stackoverflow)
CH (1) CH497648A (enrdf_load_stackoverflow)
DE (1) DE1808411C3 (enrdf_load_stackoverflow)
ES (1) ES373403A1 (enrdf_load_stackoverflow)
FR (1) FR2023098A1 (enrdf_load_stackoverflow)
GB (1) GB1259528A (enrdf_load_stackoverflow)
NL (1) NL6916949A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985094A (en) * 1976-02-20 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Series waterjet propulsion pumps for marine vehicles
US4548263A (en) * 1984-03-14 1985-10-22 Woods Billy E Fitting for dual submersible pumps
US5385453A (en) * 1993-01-22 1995-01-31 Copeland Corporation Multiple compressor in a single shell
US5404943A (en) * 1994-03-29 1995-04-11 Strawn; Wesley O. Multiple pump assembly for wells
EP1087143A3 (de) * 1999-09-24 2001-04-18 Reich KG, Regel- und Sicherheitstechnik Tauchpumpe
RU2173407C1 (ru) * 2000-02-04 2001-09-10 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П. Королева" Дублированный центробежный нагнетатель
US20060204384A1 (en) * 2004-09-03 2006-09-14 Cornell Donald E Water cannon
US20070122298A1 (en) * 2005-11-08 2007-05-31 Nicaise Lesther Electrically driven pump unit
RU2415306C1 (ru) * 2009-08-05 2011-03-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" Блок центробежных вентиляторов
CN102606445A (zh) * 2012-02-14 2012-07-25 晋州市水泵厂 一种双泵式变频潜水泵
US20140158242A1 (en) * 2011-08-10 2014-06-12 Airbus Operations Gmbh Pressure supply for a water system
TWI602994B (zh) * 2016-01-27 2017-10-21 訊凱國際股份有限公司 熱交換模組及其串聯泵
US11506227B2 (en) * 2019-05-08 2022-11-22 Rapa Automotive Gmbh & Co. Kg Energy supply unit for active chassis system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415732A1 (fr) * 1978-01-25 1979-08-24 Commissariat Energie Atomique Perfectionnement aux circuits de pompage d'un fluide sous pression
DE102011116957A1 (de) * 2011-10-26 2013-05-02 Vaillant Gmbh Multiple Koaxialpumpe

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985094A (en) * 1976-02-20 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Series waterjet propulsion pumps for marine vehicles
US4548263A (en) * 1984-03-14 1985-10-22 Woods Billy E Fitting for dual submersible pumps
US5385453A (en) * 1993-01-22 1995-01-31 Copeland Corporation Multiple compressor in a single shell
US5404943A (en) * 1994-03-29 1995-04-11 Strawn; Wesley O. Multiple pump assembly for wells
EP1087143A3 (de) * 1999-09-24 2001-04-18 Reich KG, Regel- und Sicherheitstechnik Tauchpumpe
RU2173407C1 (ru) * 2000-02-04 2001-09-10 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П. Королева" Дублированный центробежный нагнетатель
US20060204384A1 (en) * 2004-09-03 2006-09-14 Cornell Donald E Water cannon
US20070122298A1 (en) * 2005-11-08 2007-05-31 Nicaise Lesther Electrically driven pump unit
US7942649B2 (en) * 2005-11-08 2011-05-17 Jtekt Hpi Electrically driven pump unit
RU2415306C1 (ru) * 2009-08-05 2011-03-27 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева" Блок центробежных вентиляторов
US20140158242A1 (en) * 2011-08-10 2014-06-12 Airbus Operations Gmbh Pressure supply for a water system
US9611627B2 (en) * 2011-08-10 2017-04-04 Airbus Operations Gmbh Pressure supply for a water system
CN102606445A (zh) * 2012-02-14 2012-07-25 晋州市水泵厂 一种双泵式变频潜水泵
TWI602994B (zh) * 2016-01-27 2017-10-21 訊凱國際股份有限公司 熱交換模組及其串聯泵
US11506227B2 (en) * 2019-05-08 2022-11-22 Rapa Automotive Gmbh & Co. Kg Energy supply unit for active chassis system

Also Published As

Publication number Publication date
CH497648A (de) 1970-10-15
ES373403A1 (es) 1972-02-01
DE1808411A1 (de) 1970-06-25
DE1808411B2 (de) 1973-02-01
GB1259528A (enrdf_load_stackoverflow) 1972-01-05
BE741398A (enrdf_load_stackoverflow) 1970-04-16
DE1808411C3 (de) 1973-08-16
AT295798B (de) 1972-01-25
FR2023098A1 (enrdf_load_stackoverflow) 1970-08-07
NL6916949A (enrdf_load_stackoverflow) 1970-05-14

Similar Documents

Publication Publication Date Title
US3602611A (en) Pump assembly composed of two pump units arranged in a casing
US2169232A (en) Blower apparatus
US1813747A (en) Centrifugal pump
US2595737A (en) Jet pump
US2691347A (en) Helical gear pump with backed-up nonrigid casing
US3359908A (en) Turbine pump
US2810345A (en) Pump device
US4190395A (en) Multiple stage pump
US2247817A (en) Centrifugal pump
US2083447A (en) Centrifugal compressor
US3252422A (en) Circulating turbopump, particularly for central heating plants
US2406126A (en) Blade arrangement for axial compressors
US3532441A (en) Pumps with vapor handling element
US2028783A (en) Centrifugal pump
US3144201A (en) Blowers and rotary compressors
US1629141A (en) Hydraulic pump
US3096785A (en) Pipe line pump
US3639073A (en) Centrifugal pump
US3336876A (en) Pump
US2161517A (en) Axial flow turbo compressor
US1355982A (en) Centrifugal pump
US3645094A (en) Fuel-pumping system with vortex-type flow resistor
US2321810A (en) Rotary pump
US2390043A (en) Control apparatus
US633732A (en) Centrifugal pump.