CA1180977A - Pumping device - Google Patents
Pumping deviceInfo
- Publication number
- CA1180977A CA1180977A CA000400017A CA400017A CA1180977A CA 1180977 A CA1180977 A CA 1180977A CA 000400017 A CA000400017 A CA 000400017A CA 400017 A CA400017 A CA 400017A CA 1180977 A CA1180977 A CA 1180977A
- Authority
- CA
- Canada
- Prior art keywords
- liquid
- suction line
- line
- pump
- air
- 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
Links
Classifications
-
- 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
- F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
- F04F1/18—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium being mixed with, or generated from the liquid to be pumped
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
ABSTRACT
The invention relates to a pumping device for pumping up a liquid, which device comprises a diaphragm pump with a work-dependent stroke and an inlet and an outlet valve to which a suction line and a pressure line respectively are connected. In order to increase the head of liquid the pumping device os characterized in that an air-supply line is conneted to the suction line.
In the pressure pump version the first part of the pres-sure line immediately after the outlet valve extends downwards, so that the pump is self-priming. In the suc-tion version a liquid trap in the form of a loop in the suction line itself is arranged in the suction line.
The invention relates to a pumping device for pumping up a liquid, which device comprises a diaphragm pump with a work-dependent stroke and an inlet and an outlet valve to which a suction line and a pressure line respectively are connected. In order to increase the head of liquid the pumping device os characterized in that an air-supply line is conneted to the suction line.
In the pressure pump version the first part of the pres-sure line immediately after the outlet valve extends downwards, so that the pump is self-priming. In the suc-tion version a liquid trap in the form of a loop in the suction line itself is arranged in the suction line.
Description
g'77 "Pumping device"
The invention relates to a pumping device for lifting a liquid, which device comprises a diaphragm pump having a worlc-dependent stroke and an inlet valve and an outlet valve to which a suction line and a pressure line respectively are connected.
A problem with such pumping devices is that the diaphragm pump can provide only a small head of liquid.
It is an object of the invention to provide a pumping device o~ the aforementioned type in whlch the head of liquid can be increased by simple and cheap means~
To this end the pumping device is characterized in that an air-supply line is connected to the suction line.
The diaphragm pump alternately takes in air and liquid.
This reduces the flow rate, but on ihe other hand it pro-vides an increased head.
If -the diaphragm pump is switched off for a prolonged period, air will rise up in the liquid columns, so that when the pump is started again i-t is no-t capable of lifting the liquid.
In order to solve this problem the pumping device in accordance with the invention is characterized in that the first part of the pressure line immediately after the outlet valve e~tends do~nwards. As a result of this, the pump becomes self-priming In accordance with another embodiment the pumping device is characterized in that at least one liquid trap is arranged in the suction line between the air-supply line and the diaphragm pump.
Preferably, the said liquid trap is constituted by a circular loop of the suction line itself.
The pumping device may be used in those cases ~here small volumes of liquid have lo be lifted through , ~8~ 7~7 a comparatively large delivery he:ight, such as in the drainage of condensation water in heat-pump boilers, and in cellar pumps.
The invention will now be described in more detail with reference to a drawing of an embodiment.
Fig. 1 shows a pumping clevice in accordance with the invention.
Fig. 2 shows the diaphragm pump for the pumping device, Figs. 3 and 4 show a pumping device in which the pump functions as a pressure pump and is self-priming, and Figs. 5 and 6 show a pumping device in which the pump is a suction pump with water traps in the suction line.
The pumping device of Fig. 1 is constituted by a diaphragm pump 1, to which a suction line 2 and a pressure line 3 are connected. The end 4 of the suction line is located in a reservoir 5 containing a liquid which is to be pumped up. An air-supply line 6 is connected to the suction line. The diaphragm pump 1 shown in Fig. 2 is of a generally known type and is constituted by a vibrator motor 7, comprising a stator 8, a coil 9 and an armature 10 which is pivotably supported in the pump housing, and by a diaphragm 11, which is connected to the armature 10, and by a pump chamber 12 having oppositely acting inlet and outlet valves 13 and 14 respectively. In such clia-phragm pumps the length of th~ stroke of the armature depends on the required amount of work.
The operation of the pu~lping device is as follows:
When air is sucked in (in the pumping chamber) valve 12 is open and valve 14 is closed. Due to great flow resistance in air line 6 liquid will be pumped up from reservoir 5. During this suction stroke no air will be sucked in simultaneously with the liquid as a mixture at the end section 4 ~like a venturi) because the air pas-sage is obturated by the li~uid. Also the liquid flow is too slow for that. During the pressure stroke (of air) valve 12 is closed ana valve 14 is open. The liquid in the suction line will not flow back because the suction line is of relatlve small diameter (in example 3,5 mm) and because of the frequency at which the pump is operat-ing (50 Hz). After air is discharged from the pump cham-ber liquid is subsequently sucked in (in the pump chamber).
This demands more power so that the stroke will be reduced and therefore the sub-pressure is reduced. The sub-pres-sure then present in the suction line is such that only air will enter at end section 4. Liquid will not flow back, because of the relative sma]l diameter of the suc-tion line and the frequency o~ the pump. Also not during the pressure stroke (of liquid) when valve 12 is closed.
When the segment of liquid is discharged, again air is sucked in, this demands less power and the stroke of the diaphragm will be increased and only liquid is sucked in in end section 4 etc. So alternat:ely liquid and air will be sucked in and discharged.
When the pumping process is stopped it is found that after some time the liquid in the pressure line 3 has dropped to a lower level, because the air slowly escapes up the liquid columns. Above the outlet valve 14 a "solid" liquid column is formed. When the pump is switched on said "solid" liquid column cannot be forced away by the pump. In order to solve this problem, the first part of the pressure line 3 extends downwards immediately after the outlet valve 14. In Fig. 3 said first part is con-stituted by a semi-circular loop 15 of the pressure line itself. The loop should therefore be situated at a lower level than the pump. If the pumping process is stopped for some hours this again gives rise to a "solid" liquid column 16, but between said "solid" liquid column and the outlet valve 14 an air column 17 is sustained, because here the loop 15 extends upwards (see Fig. 4~. As a result of this compressible air column the pumping process is normally started when the pump is swi-tched on. Suc-cessful tests have been made with a pumping device having the following spec:ification:
97~
Pump power approx. 2.7 W
Inner suction line diameter: 3.5 mm Inner pressure line diameter: 3.5 mm Inner supply line diamet:er: 1.2 mm Difference in level between reservoir and pump: 30 cm Head: 4.2 m Capacity: 1.5 l/h Fig. 5 shows a pumping clevice in which ~he liquid is pumped from a low level to a high level, the pump being situated at the higher level. When this dif-ference in level, that is, the head, is very large, some air will escape up the liquid columns during pumping. In order to overcome this problem, one or more liquid traps is or are arranged in the suction line 2. The liquid traps, as is shown in Figs. 5 and 6, may be constituted by circular loops 18 of the suction line itself. The li~uid collects in said loops, so that the liquid is drawn in in a more or less stepwise manner. The number of loops depends on the desired head. Other forms of liquid trap may be used instead.
This pump device is also self-priming, that is to say, if the pump has remained i~operative for a pro-longed period and is then switched on again immediate suction is obtained (see Fig. 6). This pumping device, with the following specification, has also been tested with success with the following data:
Pump power: 2.7 W
Inner suction line diameter: 3.5 mm Inner air-supply line diameter: 1~2 mm Distance between the loops: approx. 50 cm Head: 4.2 m Capacity: 1.2 l/h ,~
The invention relates to a pumping device for lifting a liquid, which device comprises a diaphragm pump having a worlc-dependent stroke and an inlet valve and an outlet valve to which a suction line and a pressure line respectively are connected.
A problem with such pumping devices is that the diaphragm pump can provide only a small head of liquid.
It is an object of the invention to provide a pumping device o~ the aforementioned type in whlch the head of liquid can be increased by simple and cheap means~
To this end the pumping device is characterized in that an air-supply line is connected to the suction line.
The diaphragm pump alternately takes in air and liquid.
This reduces the flow rate, but on ihe other hand it pro-vides an increased head.
If -the diaphragm pump is switched off for a prolonged period, air will rise up in the liquid columns, so that when the pump is started again i-t is no-t capable of lifting the liquid.
In order to solve this problem the pumping device in accordance with the invention is characterized in that the first part of the pressure line immediately after the outlet valve e~tends do~nwards. As a result of this, the pump becomes self-priming In accordance with another embodiment the pumping device is characterized in that at least one liquid trap is arranged in the suction line between the air-supply line and the diaphragm pump.
Preferably, the said liquid trap is constituted by a circular loop of the suction line itself.
The pumping device may be used in those cases ~here small volumes of liquid have lo be lifted through , ~8~ 7~7 a comparatively large delivery he:ight, such as in the drainage of condensation water in heat-pump boilers, and in cellar pumps.
The invention will now be described in more detail with reference to a drawing of an embodiment.
Fig. 1 shows a pumping clevice in accordance with the invention.
Fig. 2 shows the diaphragm pump for the pumping device, Figs. 3 and 4 show a pumping device in which the pump functions as a pressure pump and is self-priming, and Figs. 5 and 6 show a pumping device in which the pump is a suction pump with water traps in the suction line.
The pumping device of Fig. 1 is constituted by a diaphragm pump 1, to which a suction line 2 and a pressure line 3 are connected. The end 4 of the suction line is located in a reservoir 5 containing a liquid which is to be pumped up. An air-supply line 6 is connected to the suction line. The diaphragm pump 1 shown in Fig. 2 is of a generally known type and is constituted by a vibrator motor 7, comprising a stator 8, a coil 9 and an armature 10 which is pivotably supported in the pump housing, and by a diaphragm 11, which is connected to the armature 10, and by a pump chamber 12 having oppositely acting inlet and outlet valves 13 and 14 respectively. In such clia-phragm pumps the length of th~ stroke of the armature depends on the required amount of work.
The operation of the pu~lping device is as follows:
When air is sucked in (in the pumping chamber) valve 12 is open and valve 14 is closed. Due to great flow resistance in air line 6 liquid will be pumped up from reservoir 5. During this suction stroke no air will be sucked in simultaneously with the liquid as a mixture at the end section 4 ~like a venturi) because the air pas-sage is obturated by the li~uid. Also the liquid flow is too slow for that. During the pressure stroke (of air) valve 12 is closed ana valve 14 is open. The liquid in the suction line will not flow back because the suction line is of relatlve small diameter (in example 3,5 mm) and because of the frequency at which the pump is operat-ing (50 Hz). After air is discharged from the pump cham-ber liquid is subsequently sucked in (in the pump chamber).
This demands more power so that the stroke will be reduced and therefore the sub-pressure is reduced. The sub-pres-sure then present in the suction line is such that only air will enter at end section 4. Liquid will not flow back, because of the relative sma]l diameter of the suc-tion line and the frequency o~ the pump. Also not during the pressure stroke (of liquid) when valve 12 is closed.
When the segment of liquid is discharged, again air is sucked in, this demands less power and the stroke of the diaphragm will be increased and only liquid is sucked in in end section 4 etc. So alternat:ely liquid and air will be sucked in and discharged.
When the pumping process is stopped it is found that after some time the liquid in the pressure line 3 has dropped to a lower level, because the air slowly escapes up the liquid columns. Above the outlet valve 14 a "solid" liquid column is formed. When the pump is switched on said "solid" liquid column cannot be forced away by the pump. In order to solve this problem, the first part of the pressure line 3 extends downwards immediately after the outlet valve 14. In Fig. 3 said first part is con-stituted by a semi-circular loop 15 of the pressure line itself. The loop should therefore be situated at a lower level than the pump. If the pumping process is stopped for some hours this again gives rise to a "solid" liquid column 16, but between said "solid" liquid column and the outlet valve 14 an air column 17 is sustained, because here the loop 15 extends upwards (see Fig. 4~. As a result of this compressible air column the pumping process is normally started when the pump is swi-tched on. Suc-cessful tests have been made with a pumping device having the following spec:ification:
97~
Pump power approx. 2.7 W
Inner suction line diameter: 3.5 mm Inner pressure line diameter: 3.5 mm Inner supply line diamet:er: 1.2 mm Difference in level between reservoir and pump: 30 cm Head: 4.2 m Capacity: 1.5 l/h Fig. 5 shows a pumping clevice in which ~he liquid is pumped from a low level to a high level, the pump being situated at the higher level. When this dif-ference in level, that is, the head, is very large, some air will escape up the liquid columns during pumping. In order to overcome this problem, one or more liquid traps is or are arranged in the suction line 2. The liquid traps, as is shown in Figs. 5 and 6, may be constituted by circular loops 18 of the suction line itself. The li~uid collects in said loops, so that the liquid is drawn in in a more or less stepwise manner. The number of loops depends on the desired head. Other forms of liquid trap may be used instead.
This pump device is also self-priming, that is to say, if the pump has remained i~operative for a pro-longed period and is then switched on again immediate suction is obtained (see Fig. 6). This pumping device, with the following specification, has also been tested with success with the following data:
Pump power: 2.7 W
Inner suction line diameter: 3.5 mm Inner air-supply line diameter: 1~2 mm Distance between the loops: approx. 50 cm Head: 4.2 m Capacity: 1.2 l/h ,~
Claims (4)
1. Apparatus for lifting a liquid, which comprises a diaphragm pump having a work-dependent stroke, and a pump chamber provided with an inlet valve and an outlet valve; a suction line connected at one end to the inlet valve, and a pressure-line connected to the outlet valve, the other end of the suction line being arranged for immersion in a body of the liquid; and an air supply line connected to the suction line between its two ends, said air supply line including a restriction having an effective inner diameter less than that of said suction line, whereby air and the liquid can be alternately sucked into the pump chamber through the suction line and discharged from the pump chamber through the pressure line.
2. Apparatus according to Claim 1, in which the pressure line first extends downwards immediately after the outlet valve.
3. Apparatus according to Claim 1, in which a liquid trap is included in the suction line between the air-supply line connection and the diaphragm pump.
4. Apparatus according to Claim 3, in which the liquid trap is constituted by a circular loop of the suction line itself.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8102103A NL8102103A (en) | 1981-04-29 | 1981-04-29 | PUMP DEVICE. |
| NL8102103 | 1981-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180977A true CA1180977A (en) | 1985-01-15 |
Family
ID=19837419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000400017A Expired CA1180977A (en) | 1981-04-29 | 1982-03-31 | Pumping device |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS57176699U (en) |
| CA (1) | CA1180977A (en) |
| DE (1) | DE3214882A1 (en) |
| ES (1) | ES264770Y (en) |
| FR (1) | FR2504990A1 (en) |
| GB (1) | GB2097485B (en) |
| IT (1) | IT1151326B (en) |
| NL (1) | NL8102103A (en) |
| SE (1) | SE8202572L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4573877A (en) * | 1985-02-12 | 1986-03-04 | Dammin Software And Technology | Apparatus for elevating liquids including a pair of Venturi pipes having wind as motive fluid |
| US4613284A (en) * | 1985-09-03 | 1986-09-23 | Iosif Baumberg | Apparatus for elevating liquids including a Venturi pipe and a liquid delay element |
| US4643650A (en) * | 1985-11-25 | 1987-02-17 | Khakzad Ghomi Abdol Hossein | Fluid-raising apparatus driven by low hydraulic head |
| US4808078A (en) * | 1987-10-05 | 1989-02-28 | Phoenix Park Systems | Pump control system for instantly reversing the drive motor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE90740C (en) * | ||||
| DE252340C (en) * | ||||
| BE521726A (en) * | ||||
| DE72396C (en) * | 1891-09-20 | 1894-01-08 | Dr. phil. g. W. A. KAHLBAUM in Basel | Mixed air pump for lifting liquids |
| FR1185876A (en) * | 1957-11-08 | 1959-08-07 | Liquid pump and others | |
| US3133507A (en) * | 1959-10-06 | 1964-05-19 | Philips Corp | Bubble-up pump |
| SE365027B (en) * | 1972-04-26 | 1974-03-11 | Electrolux Ab |
-
1981
- 1981-04-29 NL NL8102103A patent/NL8102103A/en not_active Application Discontinuation
-
1982
- 1982-03-31 CA CA000400017A patent/CA1180977A/en not_active Expired
- 1982-04-22 DE DE19823214882 patent/DE3214882A1/en not_active Withdrawn
- 1982-04-23 FR FR8207014A patent/FR2504990A1/en active Granted
- 1982-04-26 SE SE8202572A patent/SE8202572L/en not_active Application Discontinuation
- 1982-04-26 JP JP1982061018U patent/JPS57176699U/ja active Pending
- 1982-04-26 IT IT20938/82A patent/IT1151326B/en active
- 1982-04-26 GB GB8211992A patent/GB2097485B/en not_active Expired
- 1982-04-27 ES ES1982264770U patent/ES264770Y/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES264770Y (en) | 1983-05-16 |
| DE3214882A1 (en) | 1982-11-18 |
| SE8202572L (en) | 1982-10-30 |
| FR2504990B1 (en) | 1985-01-18 |
| IT1151326B (en) | 1986-12-17 |
| GB2097485B (en) | 1984-10-24 |
| FR2504990A1 (en) | 1982-11-05 |
| IT8220938A0 (en) | 1982-04-26 |
| GB2097485A (en) | 1982-11-03 |
| JPS57176699U (en) | 1982-11-08 |
| ES264770U (en) | 1982-11-16 |
| NL8102103A (en) | 1982-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |