EP2082135B1 - Active check valves in diaphragm pump with solenoid drive - Google Patents
Active check valves in diaphragm pump with solenoid drive Download PDFInfo
- Publication number
- EP2082135B1 EP2082135B1 EP06818564A EP06818564A EP2082135B1 EP 2082135 B1 EP2082135 B1 EP 2082135B1 EP 06818564 A EP06818564 A EP 06818564A EP 06818564 A EP06818564 A EP 06818564A EP 2082135 B1 EP2082135 B1 EP 2082135B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diaphragm
- valve body
- valve
- pump according
- pump
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 239000003599 detergent Substances 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 25
- 238000007906 compression Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 17
- 239000013078 crystal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/028—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms with in- or outlet valve arranged in the plate-like flexible member
Definitions
- This invention relates generally to diaphragm pumps and more particularly to a diaphragm pump, in particular for use as a detergent dosage pump comprising a pump housing, a working fluid chamber, at least one intake, at least one outlet, at least one diaphragm defining a wall of the working fluid chamber and reciprocatingly moveable, diaphragm driving means reciprocating said diaphragm and at least one check valve including a spring biassed valve body for controlling ingress of the fluid into the working fluid chamber.
- Diaphragm and piston pumps are used to supply metered quantities of liquids with various properties.
- the pump behavior is subject to various requirements in order to ensure that the delivered quantity of the metered medium is as precise as possible and remains constant for as long as possible.
- Diaphragm pumps are common industrial pumps that use positive displacement to move liquids. These devices typically include a single diaphragm and chamber, as well as discharge check valves to prevent back-flow. Pistons are either coupled to the diaphragm or used to force hydraulic oil to drive the diaphragm. Diaphragm pumps are normally highly reliable because they do not include internal parts that rub against each other. Diaphragm pumps can handle a range of media that includes abrasive materials, acids, chemicals, or the like since the drive means is normally completely separated from hydraulic part of the pump. Since diaphragm pumps can deliver small volumes of fluid with the maximum discharge, they are especially suitable as dosage pumps.
- Diaphragm pumps as dosage pumps have two strokes, i.e. an aspiration stroke in which the medium is aspirated from a reservoir and a compression stroke or delivery stroke where delivery of the metered medium e. g. into a metered line takes place.
- Diaphragm pumps known in the art for instance comprise suction check valves as well as discharge check valve to prevent back-flow. These check valves are usually spring biassed and are opened and closed by the pressure difference of the medium to be pumped. Especially when pumping highly concentrated detergents, known diaphragm pumps often fail because of crystallization and particles in the check valves.
- the valve bodies of the check valves are normally held in sealing relationship to the valve seat by means of a compression spring.
- the check valves are normally only operated by the differential pressure of the fluid. This compression spring exerts a comparatively low spring force in order to ensure that the check valve can easily be opened. This applies in particular to the check valve on the suction side of the pump.
- US patent 4,636,149 discloses a biomedical pump which includes a housing with an internal pump chamber defined by a first rigid concave wall formed by the pump body, and an opposed flexible wall defined by a diaphragm incorporating a heat responsive disc for a thermal-responsive pumping movement between a first position overlying and conforming to the body defined first wall and a second position outwardly spaced therefrom.
- An inlet passageway and an outlet passageway each communicate with the interior of the chamber through the pump body.
- Each passageway incorporates a check valve for a directional control of the fluid flow in response to the heat induced diaphragm movement.
- European patent application EP 1 462 694 discloses a valve assembly including a valve body having a valve seat surrounding a valve outlet and valve stem having a head portion adapted to contact and form a seal with the valve seat when the valve seat is in its closed state, the valve stem having an elastically deformable portion which is deformed when the valve is in the open position thereby providing a restorative force to bias the head portion towards contact with the valve seat.
- the valve assembly according to EP 1 462 694 comprises additional biasing means mounted between the valve body and the valve stem to urge the head portion towards contact with the valve seat.
- a diaphragm pump according to the preamble of claim 1 is for instance disclosed in US patent 5,279,504 .
- a diaphragm pump in particular for use as a detergent dosage pump comprising a pump housing, a working fluid chamber, at least one intake, at least one outlet, one diaphragm defining a wall of the working fluid chamber and reciprocatingly moveable, diaphragm driving means reciprocating said diaphragm and at least one check valve including a spring biassed valve body for controlling ingress of the fluid into the working fluid chamber, the diaphragm pump being characterized by additional means for mechanically pushing the valve body into its valve seat, wherein said additional means for pushing the valve body into its associated valve seat are driven by said diaphragm driving means.
- the diaphragm pump according to the invention has the advantage that even though small particles or crystals gather between the valve body and the valve seat, the valve body is forcedly pushed into the valve seat so that the basic functions of the diaphragm pump are ensured.
- the valve body is forced into the valve seat, small crystals will be destroyed so that the valve body is located within the valve seat in sealing relationship.
- check valves can shut with a comparatively high force although the spring load exerted on the valve body may still be comparatively low, so that the valve can easily be operated by the fluid pressure.
- the diaphragm pump comprises first and second check valves, the second check valve opening in the opposite direction than the first check valve.
- said second valve body constantly holds said first valve body in the closed position when the pump is not operated.
- a safety shut-off valve is provided. This is particularly advantageous insofar that for instance a detergent container may be arranged higher than the pump. The shut-off function prevents very effectively flow through the pump in the event the pump is not operated.
- the second valve body is coupled to the diaphragm drive means and is reciprocated synchronously with the stroke of the diaphragm.
- said second check valve forms part of said diaphragm.
- This design has in particular the advantage that the dead space or dead volume (difference between the total volume of the working fluid chamber and volume of displacement during the compression stroke) is minimized to such an extend that the pump according to the invention is even unsusceptible to sucking air during start-up. Due to the minimization of the dead volume, even compressibility of air which is trapped into the system does not affect the operation of the pump.
- the second valve body may be yieldingly held in sealing relationship against the diaphragm, thereby closing an aperture in the diaphragm at least during a first stroke (aspiration stroke) of the diaphragm and establishing fluid communication between said working fluid chamber and said outlet during a second stroke (compression stroke) of the diaphragm.
- said second valve body and said diaphragm are spring biassed against each, other so that pressure built up during the compression stroke of the diaphragm is determined by the elastic resilience of the spring.
- the diaphragm Since the second valve body is only lifted from its valve seat when the pressure built up during the compression stroke within the working fluid chamber has reached a certain level, the diaphragm has an extremely efficient pressure ratio.
- said diaphragm drive means is a solenoid drive.
- a bend lever drive or an hydraulically operated drive or a pneumatically operated drive may be provided.
- the second valve body comprises a stem coupled to the armature of said solenoid drive.
- figure 1 shows an exemplary embodiment of the diaphragm pump 1 consistent with the present invention.
- the diaphragm pump 1 comprises a pump housing 2 with an intake 3 and an outlet 4, the intake 3 being the suction port and the outlet 4 being the pressure port.
- a pump chamber 5a, 5b is defined within the pump housing 2.
- the pump chamber 5a, 5b houses a main diaphragm 6 which divides the pump chamber into first and second compartments 5a, 5b.
- the intake 3 communicates with the first compartment 5a of the pump chamber defining the working fluid chamber, the outlet 4 communicating with the second compartment 5b of the working fluid chamber.
- the diaphragm pump 1 comprises first and second check valves 7 and 8, the first check valve 7 controlling the intake 3, the second check valve 8 being arranged in series with the first check valve 7, as will be explained hereinafter in greater detail.
- the first check valve 7 comprises a mushroom-like first valve body 7a which is spring biassed against the first valve seat 7b, by means of a first compression spring 7c.
- the first valve body 7a is sealed against the first valve seat 7b by means of a sealing ring 7d, preferably by means of a O-ring sealing.
- the diaphragm 6 is reciprocatingly driven within the pump housing 2 by a solenoid drive only the armature 9 of which is shown in the drawings.
- the armature 9 of the solenoid drive is coupled to a stem 10 of a second mushroom-like valve body 8a.
- the stem 10a of the second valve body 8a penetrates an aperture 11 in the centre of the main diaphragm 6.
- the second valve body 8a is held spring biassed in sealing relationship against the main diaphragm 6, thereby sealingly closing the aperture 11.
- a second compression spring 8c which rests on the base 12 of the stem 10 forces the main diaphragm 6 against the sealing surface 13 of the second valve body 8a.
- the surface of the main diaphragm forming the inner wall of the first compartment 5a is provided with an annular sealing rib 14.
- a rigid holding member 15 with a peripheral collar 16 for abutment of the second compression spring 8c is provided.
- the main diaphragm 6 with its central aperture 11 does form part of the second check valve 8.
- the armature 9 of the solenoid drive is sealed against the second compartment 5b of the pump chamber by an auxiliary diaphragm 17 which has only sealing function as it synchronously reciprocates with the main diaphragm on operation of the diaphragm pump 1 as will be explained hereinafter.
- the stem 10 of the second valve body 8a penetrates the holding member 15 and the aperture 11 of the main diaphragm 6. Between the stem 10 and the aperture 11 and between the stem 10 and an aperture 18 in the holding member 15, the aperture 18 being in alignment with the aperture 11, an annular gap 19 is formed which establishes fluid communication between the first and second compartments 5a and 5b when the second check valve 8 opens.
- figure 1 shows the diaphragm pump according to the invention during the aspiration stroke.
- the armature 9 of the solenoid drive is retracted (i.e. moved to the right in figure 1 ).
- the main diaphragm 6 and the auxiliary diaphragm 17 are moved synchronously with the armature 9.
- the volume of the first compartment 5a increases so that suction is applied to the intake 3. This causes the first valve body 7a to lift from its associated first valve seat 7b against the pressure of the first compression spring 7c.
- the first compartment 5a of the pump chamber is now in fluid communication with the intake 3 allowing ingress of the medium to be pumped into the first compartment 5a.
- the fluid may enter the first compartment 5a through an annular gap 20 between the first valve body 7a and the first valve seat 7b.
- the compression force exerted by the first compression spring 7c is comparatively low so that only a little pressure difference between the first compartment 5a and the intake 3 is sufficient to allow the medium to be pumped to flow into the compartment 5a.
- FIG 2 the diaphragm pump 1 according to the invention is shown during the compression stroke.
- operation of the solenoid drive causes the armature 9 connected to the stem 10 of the second valve body 8b to reciprocate within the pump housing.
- the pumping action is thereby mainly performed by the main diaphragm 6.
- the volume of the first compartment 5a will be decreased, which causes pressure built up in the compartment 5a.
- the spring force of the first compression spring 7c causes the first valve body 7a to move into its associated valve seat 7b. This movement is supported by the rising pressure within the compartment 5a.
- the rising pressure within the first compartment 5a acts on the main diaphragm to the effect that the main diaphragm 6 is pushed against the spring force of the second compression spring 8c which is compared to the first compression spring 7c relatively strong.
- first and second valve body 7a and 8a are arranged such that their paths of travel intersect. That is to say that the second valve body 8a at the end of the compression stroke pushes the first valve body 7a into its closed position. For instance in the event that the first valve body should be jammed in its open position due to particles or crystals gathering between the sealing ring 7d and the associated sealing surface of the valve body, the second valve body 8a would push the first valve body 7a by force into its closed position.
- Figure 3 shows the initial situation of the pump when the solenoid drive is not operated.
- the first valve body 7a is constantly held in its closed position by the second valve body 8a, so that the first and second check valves function like a security shut-off valve.
- the second valve body 8a forms part of the diaphragm drive mechanism as it reciprocates the main diaphragm 6 within the pump housing 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
- This invention relates generally to diaphragm pumps and more particularly to a diaphragm pump, in particular for use as a detergent dosage pump comprising a pump housing, a working fluid chamber, at least one intake, at least one outlet, at least one diaphragm defining a wall of the working fluid chamber and reciprocatingly moveable, diaphragm driving means reciprocating said diaphragm and at least one check valve including a spring biassed valve body for controlling ingress of the fluid into the working fluid chamber.
- Diaphragm and piston pumps are used to supply metered quantities of liquids with various properties. Depending on the field of application, the pump behavior is subject to various requirements in order to ensure that the delivered quantity of the metered medium is as precise as possible and remains constant for as long as possible.
- Diaphragm pumps are common industrial pumps that use positive displacement to move liquids. These devices typically include a single diaphragm and chamber, as well as discharge check valves to prevent back-flow. Pistons are either coupled to the diaphragm or used to force hydraulic oil to drive the diaphragm. Diaphragm pumps are normally highly reliable because they do not include internal parts that rub against each other. Diaphragm pumps can handle a range of media that includes abrasive materials, acids, chemicals, or the like since the drive means is normally completely separated from hydraulic part of the pump. Since diaphragm pumps can deliver small volumes of fluid with the maximum discharge, they are especially suitable as dosage pumps.
- Another reason for using diaphragm pumps as dosage pumps is that these pumps have two strokes, i.e. an aspiration stroke in which the medium is aspirated from a reservoir and a compression stroke or delivery stroke where delivery of the metered medium e. g. into a metered line takes place. Diaphragm pumps known in the art for instance comprise suction check valves as well as discharge check valve to prevent back-flow. These check valves are usually spring biassed and are opened and closed by the pressure difference of the medium to be pumped. Especially when pumping highly concentrated detergents, known diaphragm pumps often fail because of crystallization and particles in the check valves. The valve bodies of the check valves are normally held in sealing relationship to the valve seat by means of a compression spring. The check valves are normally only operated by the differential pressure of the fluid. This compression spring exerts a comparatively low spring force in order to ensure that the check valve can easily be opened. This applies in particular to the check valve on the suction side of the pump.
-
US patent 4,636,149 (closest prior art) discloses a biomedical pump which includes a housing with an internal pump chamber defined by a first rigid concave wall formed by the pump body, and an opposed flexible wall defined by a diaphragm incorporating a heat responsive disc for a thermal-responsive pumping movement between a first position overlying and conforming to the body defined first wall and a second position outwardly spaced therefrom. An inlet passageway and an outlet passageway each communicate with the interior of the chamber through the pump body. Each passageway incorporates a check valve for a directional control of the fluid flow in response to the heat induced diaphragm movement. - European
patent application EP 1 462 694 discloses a valve assembly including a valve body having a valve seat surrounding a valve outlet and valve stem having a head portion adapted to contact and form a seal with the valve seat when the valve seat is in its closed state, the valve stem having an elastically deformable portion which is deformed when the valve is in the open position thereby providing a restorative force to bias the head portion towards contact with the valve seat. The valve assembly according toEP 1 462 694 - A diaphragm pump according to the preamble of
claim 1 is for instance disclosed inUS patent 5,279,504 . - The design of the diaphragm pump according to this patent as well as other diaphragm pumps known in the art suffer from the disadvantage that sometimes only small amounts of dirt prevent the valve body to be located properly in the valve seat so as to guarantee function of the check valve. This results in complete failure of the pump. Accordingly, it is desirable to provide a diaphragm pump which is unsusceptible to small particles of dirt and crystallization in the metered medium.
- According to one aspect of the invention, there is provided a diaphragm pump, in particular for use as a detergent dosage pump comprising
a pump housing,
a working fluid chamber,
at least one intake,
at least one outlet,
one diaphragm defining a wall of the working fluid chamber and reciprocatingly moveable,
diaphragm driving means reciprocating said diaphragm and
at least one check valve including a spring biassed valve body for controlling ingress of the fluid into the working fluid chamber, the diaphragm pump being characterized by additional means for mechanically pushing the valve body into its valve seat, wherein said additional means for pushing the valve body into its associated valve seat are driven by said diaphragm driving means. - The diaphragm pump according to the invention has the advantage that even though small particles or crystals gather between the valve body and the valve seat, the valve body is forcedly pushed into the valve seat so that the basic functions of the diaphragm pump are ensured. In particular when delivering detergents which are highly concentrated, it may happen that small crystals grow in the medium to be metered. In such a event, when the valve body is forced into the valve seat, small crystals will be destroyed so that the valve body is located within the valve seat in sealing relationship. With the design according to the invention, check valves can shut with a comparatively high force although the spring load exerted on the valve body may still be comparatively low, so that the valve can easily be operated by the fluid pressure.
- According to another aspect of the invention, the diaphragm pump comprises first and second check valves, the second check valve opening in the opposite direction than the first check valve.
- It is e. g. advantageous to arrange the check valves in a way that the paths of travel of first and second valve bodies of the first and second check valves, respectively, intersect each other such that the second valve body pushes said first valve body into its associated valve seat when lifted into its open position. In another words, during every compression stroke, the second valve body pushes the first valve body into its closed position.
- Yet according to another aspect of the invention, said second valve body constantly holds said first valve body in the closed position when the pump is not operated. According to this aspect of the invention, a safety shut-off valve is provided. This is particularly advantageous insofar that for instance a detergent container may be arranged higher than the pump. The shut-off function prevents very effectively flow through the pump in the event the pump is not operated.
- According to yet another aspect of the invention, the second valve body is coupled to the diaphragm drive means and is reciprocated synchronously with the stroke of the diaphragm.
- In one preferred embodiment, said second check valve forms part of said diaphragm.
- This design has in particular the advantage that the dead space or dead volume (difference between the total volume of the working fluid chamber and volume of displacement during the compression stroke) is minimized to such an extend that the pump according to the invention is even unsusceptible to sucking air during start-up. Due to the minimization of the dead volume, even compressibility of air which is trapped into the system does not affect the operation of the pump.
- The second valve body may be yieldingly held in sealing relationship against the diaphragm, thereby closing an aperture in the diaphragm at least during a first stroke (aspiration stroke) of the diaphragm and establishing fluid communication between said working fluid chamber and said outlet during a second stroke (compression stroke) of the diaphragm.
- Due to this design, the hydraulically effective surface of the pump is increased to a maximum.
- In a preferred embodiment of the diaphragm pump according to the invention, said second valve body and said diaphragm are spring biassed against each, other so that pressure built up during the compression stroke of the diaphragm is determined by the elastic resilience of the spring.
- Since the second valve body is only lifted from its valve seat when the pressure built up during the compression stroke within the working fluid chamber has reached a certain level, the diaphragm has an extremely efficient pressure ratio.
- Advantageously, said diaphragm drive means is a solenoid drive.
- Alternatively, a bend lever drive or an hydraulically operated drive or a pneumatically operated drive may be provided.
- According to yet another aspect of the invention, the second valve body comprises a stem coupled to the armature of said solenoid drive.
- In the following the invention will be explained in greater detail with reference to the accompanying drawings, in which:
-
Figure 1 shows a cross-sectional view of an exemplary diaphragm pump consistent with the present invention during the aspiration stroke; -
Figure 2 shows the diaphragm pump according tofigure 1 during the compression stroke; and -
Figure 3 shows the diaphragm pump according to the invention at the end of the compression stroke. - With reference now to the drawings,
figure 1 shows an exemplary embodiment of thediaphragm pump 1 consistent with the present invention. Thediaphragm pump 1 comprises apump housing 2 with anintake 3 and anoutlet 4, theintake 3 being the suction port and theoutlet 4 being the pressure port. - Within the
pump housing 2, apump chamber 5a, 5b is defined. Thepump chamber 5a, 5b houses amain diaphragm 6 which divides the pump chamber into first andsecond compartments 5a, 5b. Theintake 3 communicates with thefirst compartment 5a of the pump chamber defining the working fluid chamber, theoutlet 4 communicating with the second compartment 5b of the working fluid chamber. - The
diaphragm pump 1 according to the invention comprises first andsecond check valves first check valve 7 controlling theintake 3, thesecond check valve 8 being arranged in series with thefirst check valve 7, as will be explained hereinafter in greater detail. - The
first check valve 7 comprises a mushroom-likefirst valve body 7a which is spring biassed against the first valve seat 7b, by means of afirst compression spring 7c. Thefirst valve body 7a is sealed against the first valve seat 7b by means of asealing ring 7d, preferably by means of a O-ring sealing. - The
diaphragm 6 is reciprocatingly driven within thepump housing 2 by a solenoid drive only thearmature 9 of which is shown in the drawings. Thearmature 9 of the solenoid drive is coupled to astem 10 of a second mushroom-like valve body 8a. The stem 10a of thesecond valve body 8a penetrates anaperture 11 in the centre of themain diaphragm 6. In the state shown infigure 1 , thesecond valve body 8a is held spring biassed in sealing relationship against themain diaphragm 6, thereby sealingly closing theaperture 11. For that purpose, asecond compression spring 8c which rests on thebase 12 of thestem 10 forces themain diaphragm 6 against the sealingsurface 13 of thesecond valve body 8a. For sealing against the corresponding sealingsurface 13 of thesecond valve body 8a, the surface of the main diaphragm forming the inner wall of thefirst compartment 5a is provided with anannular sealing rib 14. - At this side of the
main diaphragm 6 facing the second compartment 5b of the pump chamber, a rigid holdingmember 15 with aperipheral collar 16 for abutment of thesecond compression spring 8c is provided. - As this can easily be understood from the drawings, the
main diaphragm 6 with itscentral aperture 11 does form part of thesecond check valve 8. Thearmature 9 of the solenoid drive is sealed against the second compartment 5b of the pump chamber by anauxiliary diaphragm 17 which has only sealing function as it synchronously reciprocates with the main diaphragm on operation of thediaphragm pump 1 as will be explained hereinafter. - As can be taken from the drawings, the
stem 10 of thesecond valve body 8a penetrates the holdingmember 15 and theaperture 11 of themain diaphragm 6. Between thestem 10 and theaperture 11 and between thestem 10 and anaperture 18 in the holdingmember 15, theaperture 18 being in alignment with theaperture 11, anannular gap 19 is formed which establishes fluid communication between the first andsecond compartments 5a and 5b when thesecond check valve 8 opens. - The function of the
diaphragm pump 1 will now be explained with reference to the accompanying drawings. - As already explained above,
figure 1 shows the diaphragm pump according to the invention during the aspiration stroke. During the aspiration stroke, thearmature 9 of the solenoid drive is retracted (i.e. moved to the right infigure 1 ). By a reciprocating movement of thearmature 9, which is coupled to thestem 10, also themain diaphragm 6 and theauxiliary diaphragm 17 are moved synchronously with thearmature 9. The volume of thefirst compartment 5a increases so that suction is applied to theintake 3. This causes thefirst valve body 7a to lift from its associated first valve seat 7b against the pressure of thefirst compression spring 7c. Thefirst compartment 5a of the pump chamber is now in fluid communication with theintake 3 allowing ingress of the medium to be pumped into thefirst compartment 5a. The fluid may enter thefirst compartment 5a through anannular gap 20 between thefirst valve body 7a and the first valve seat 7b. - The compression force exerted by the
first compression spring 7c is comparatively low so that only a little pressure difference between thefirst compartment 5a and theintake 3 is sufficient to allow the medium to be pumped to flow into thecompartment 5a. - Turning now to
figure 2 , thediaphragm pump 1 according to the invention is shown during the compression stroke. - As has been explained before, operation of the solenoid drive causes the
armature 9 connected to thestem 10 of the second valve body 8b to reciprocate within the pump housing. The pumping action is thereby mainly performed by themain diaphragm 6. During the compression stroke, the volume of thefirst compartment 5a will be decreased, which causes pressure built up in thecompartment 5a. The spring force of thefirst compression spring 7c causes thefirst valve body 7a to move into its associated valve seat 7b. This movement is supported by the rising pressure within thecompartment 5a. Moreover, the rising pressure within thefirst compartment 5a acts on the main diaphragm to the effect that themain diaphragm 6 is pushed against the spring force of thesecond compression spring 8c which is compared to thefirst compression spring 7c relatively strong. This pressure built up within thefirst compartment 5a causes a relative movement between thesecond valve body 8a and themain diaphragm 6 to the effect that thesecond valve body 8a is lifted up from its associated second valve seat formed by themain diaphragm 6. The fluid which was trapped in thefirst compartment 5a is now allowed to enter the second compartment 5b viaannular gap 19. - As can be seen more clearly from
figure 3 , the first andsecond valve body second valve body 8a at the end of the compression stroke pushes thefirst valve body 7a into its closed position. For instance in the event that the first valve body should be jammed in its open position due to particles or crystals gathering between the sealingring 7d and the associated sealing surface of the valve body, thesecond valve body 8a would push thefirst valve body 7a by force into its closed position. -
Figure 3 shows the initial situation of the pump when the solenoid drive is not operated. In another words, in this situation thefirst valve body 7a is constantly held in its closed position by thesecond valve body 8a, so that the first and second check valves function like a security shut-off valve. - It is to be understood that during the subsequent stroke of the
diaphragm pump 1, the volume of the second compartment 5b would decrease so that the fluid would move into the outlet 4 (pressure port). - It is also clear from the above explanation that the
second valve body 8a forms part of the diaphragm drive mechanism as it reciprocates themain diaphragm 6 within thepump housing 2. - The embodiment that has been described herein has been described by way of illustration but not of limitation. It is obvious that many other embodiments, which will be readily apparent to those skilled in the art, may be made without departing materially from the spirit and scope of the invention.
-
- 1
- diaphragm pump
- 2
- pump housing
- 3
- intake
- 4
- outlet
- 5a, 5b
- first and second compartments of the pump chamber
- 6
- main diaphragm
- 7
- first check valve
- 7a
- first valve body
- 7b
- first valve seat
- 7c
- first compression spring
- 7d
- sealing ring
- 8
- second check valve
- 8a
- second valve body
- 8c
- second compression spring
- 9
- armature
- 10
- stem
- 11
- aperture
- 12
- base of stem
- 13
- sealing surface
- 14
- sealing rib
- 15
- holding member
- 16
- collar
- 17
- auxiliary diaphragm
- 18
- aperture
- 19
- annular gap
- 20
- annular gap
Claims (10)
- Diaphragm pump, in particular for use as a detergent dosage pump comprising:a pump housing (2), a working fluid chamber, at least one intake (3), at least one outlet (4), one diaphragm (6) defining a wall of the working fluid chamber and reciprocatingly movable, diaphragm driving means for reciprocating said diaphragm (6) and at least one check valve (7) including a spring biassed valve body (7a) for controlling ingress of the fluid into the working fluid chamber, characterized by additional means for mechanically pushing the valve body (7a) into its valve seat (7b), and further characterized in that said additional means for pushing the valve body (7a) into its associated valve seat (7b) by driven by said diaphragm driving means.
- Diaphragm pump according to claim 1, characterized in that it comprises first and second check valves (7, 8), the second check valve (8) opening in the opposite direction than the first check valve (7).
- Diaphragm pump according to claim 1, characterized in that the paths of travel of said first and second valve bodies (7a, 8a) of said first and second check valves (7, 8), respectively, intersect each other such that the second valve body (8a) pushes said first valve body (7a) into its associated first valve seat (7b) when said second valve body (8a) is lifted into its open position.
- Diaphragm pump according to one of the claims 2 or 3, characterized in that said second valve body (8a) constantly holds said first valve body (7a) in the closed position when the pump is not operated.
- Diaphragm pump according to one of the claims 2 to 4, characterized in that the second valve body (8a) is coupled to the diaphragm driving means and is reciprocated synchronously with the stroke of the diaphragm.
- Diaphragm pump according to claim 5, characterized in that said diaphragm (6) forms part of the second check valve (8).
- Diaphragm pump according to claim 6, characterized in that the second valve body (8a) is yieldingly held in sealing relationship against the diaphragm (6), thereby closing an aperture (11) in the diaphragm (6) at least during a first stroke of the diaphragm (6) and establishing fluid communication between said working fluid chamber and said outlet (4) during a second stroke of the diaphragm (6).
- Diaphragm pump according to claim 7, characterized in that the second valve body (8a) and said diaphragm (6) are spring biassed against each other so that pressure built up during the compression stroke of the diaphragm (6) is determined by the elastic resilience of the spring.
- Diaphragm pump according to one of the preceding claims, characterized in that said diaphragm drive means is a solenoid drive.
- Diaphragm pump according to claim 9, characterized in that the second valve body (8a) comprises a stem (10) coupled to the armature (9) of said solenoid drive.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2006/010969 WO2008058558A1 (en) | 2006-11-16 | 2006-11-16 | Active check valves in diaphragm pump with solenoid drive |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2082135A1 EP2082135A1 (en) | 2009-07-29 |
EP2082135B1 true EP2082135B1 (en) | 2011-03-16 |
Family
ID=37696104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06818564A Active EP2082135B1 (en) | 2006-11-16 | 2006-11-16 | Active check valves in diaphragm pump with solenoid drive |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP2082135B1 (en) |
JP (1) | JP5123310B2 (en) |
AT (1) | ATE502212T1 (en) |
AU (1) | AU2006350904B2 (en) |
CA (1) | CA2668624C (en) |
DE (1) | DE602006020791D1 (en) |
ES (1) | ES2359084T3 (en) |
WO (1) | WO2008058558A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6369492B2 (en) * | 2016-03-11 | 2018-08-08 | 株式会社環境衛生 | Humidifier, diaphragm pump and diaphragm |
JP7227396B2 (en) * | 2019-03-28 | 2023-02-21 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッド | plant protection drone |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB505510A (en) * | 1937-11-13 | 1939-05-12 | Sidney Alfred Barr Hall | Direct coupled diaphragms for pumping of liquids and semi-solids in all diaphragm pumps |
JPS5449604U (en) * | 1977-09-13 | 1979-04-06 | ||
US4636149A (en) * | 1985-05-13 | 1987-01-13 | Cordis Corporation | Differential thermal expansion driven pump |
US5279504A (en) * | 1992-11-02 | 1994-01-18 | Williams James F | Multi-diaphragm metering pump |
US5730418A (en) * | 1996-09-30 | 1998-03-24 | The Kipp Group | Minimum fluid displacement medical connector |
NZ524996A (en) * | 2003-03-27 | 2005-09-30 | Itw New Zealand Ltd | Valve assembly |
-
2006
- 2006-11-16 AT AT06818564T patent/ATE502212T1/en not_active IP Right Cessation
- 2006-11-16 JP JP2009536608A patent/JP5123310B2/en active Active
- 2006-11-16 AU AU2006350904A patent/AU2006350904B2/en active Active
- 2006-11-16 DE DE602006020791T patent/DE602006020791D1/en active Active
- 2006-11-16 CA CA2668624A patent/CA2668624C/en active Active
- 2006-11-16 EP EP06818564A patent/EP2082135B1/en active Active
- 2006-11-16 ES ES06818564T patent/ES2359084T3/en active Active
- 2006-11-16 WO PCT/EP2006/010969 patent/WO2008058558A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
JP2010510422A (en) | 2010-04-02 |
EP2082135A1 (en) | 2009-07-29 |
AU2006350904A1 (en) | 2008-05-22 |
AU2006350904B2 (en) | 2012-05-31 |
ES2359084T3 (en) | 2011-05-18 |
CA2668624C (en) | 2014-05-06 |
ATE502212T1 (en) | 2011-04-15 |
WO2008058558A1 (en) | 2008-05-22 |
CA2668624A1 (en) | 2008-05-22 |
DE602006020791D1 (en) | 2011-04-28 |
JP5123310B2 (en) | 2013-01-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5848880A (en) | Axial valve arrangement for a high pressure plunger pump | |
EP1898085A3 (en) | An electromagnetic drive mechanism of a high-pressure fuel supply pump | |
US20090155093A1 (en) | Hydraulic device with a lubricating pump | |
EP1512358A2 (en) | Fluid pump | |
EP2082135B1 (en) | Active check valves in diaphragm pump with solenoid drive | |
EP1536137B1 (en) | Fuel pump for an internal combustion engine | |
JP3386052B2 (en) | Pump device | |
EP1977298B1 (en) | Air release valve | |
KR100641819B1 (en) | Piston pump | |
JP4165295B2 (en) | ON / OFF VALVE AND DRIVING MACHINE HAVING ON / OFF VALVE | |
JP4103395B2 (en) | Pump device | |
CN116816651B (en) | High-strength reciprocating hydraulic diaphragm pump | |
KR101021498B1 (en) | A pump for brake control system | |
RU2314448C2 (en) | Hydraulic check valve | |
RU2079715C1 (en) | Diaphragm fluid-operated batching pump | |
KR100990070B1 (en) | A pump for brake control system | |
KR101021528B1 (en) | Pump for brake system | |
JP3701623B2 (en) | Valve switching device | |
JPS6241073B2 (en) | ||
RU2171398C1 (en) | Hydraulically-operated diaphragm proportioning pump | |
JPH0663873U (en) | Air compressor | |
JPH08144939A (en) | Duplex pressure booster | |
JPH0727054A (en) | Hydraulic diaphragm pump | |
JPH0156241B2 (en) | ||
KR20030067922A (en) | Pump of electronic control brake system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090512 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20090917 |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 602006020791 Country of ref document: DE Date of ref document: 20110428 Kind code of ref document: P |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602006020791 Country of ref document: DE Effective date: 20110428 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2359084 Country of ref document: ES Kind code of ref document: T3 Effective date: 20110506 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: VDEP Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110617 |
|
LTIE | Lt: invalidation of european patent or patent extension |
Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110616 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110718 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110716 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20111219 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602006020791 Country of ref document: DE Effective date: 20111219 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111130 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111130 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111130 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111116 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111116 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110316 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 602006020791 Country of ref document: DE Representative=s name: GODEMEYER BLUM LENZE PARTNERSCHAFT, PATENTANWA, DE Ref country code: DE Ref legal event code: R082 Ref document number: 602006020791 Country of ref document: DE Representative=s name: GODEMEYER BLUM LENZE PATENTANWAELTE, PARTNERSC, DE |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 10 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 13 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20230928 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20230911 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20231208 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20231010 Year of fee payment: 18 Ref country code: DE Payment date: 20230919 Year of fee payment: 18 |