DE3335610A1 - PUMP TO ADD A LIQUID ADDITION TO A LIQUID FLOW - Google Patents

Description

Rössel 1 Fluid Control Limited,

Mead Way, Lydney, Gloucestershire, England GL15 4EJ

Pump to deliver a liquid additive to a liquid stream.

The invention relates to a pump for supplying a liquid additive to a liquid stream.

Pumps for this purpose are known, see for example British Patents Nos. 1,243,732 and 1,387,880. These two pumps are primarily intended for use in horticulture, d. H. to introduce certain amounts of liquid fertilizer into the irrigation water. During this Pumps work satisfactorily in the environment for which they are intended, solving the problem, Injecting an additive into a flowing liquid does not make it the best choice for certain other environments e.g. environments where there is no electricity, i. H. in remote, rural Areas, or in environments where a fire hazard must be avoided at all costs, e.g. B. in a petrochemical Industrial plant. For use in a petrochemical industrial plant, pumps can be made fire-tight and other appropriate measures can be taken.

However, just such measures tend to reduce manufacturing costs to enlarge the pump to a great extent.

It is therefore an object of the present invention to provide a pump which can be used in a wide range of environments is suitable, be it in an industrial environment, in an agricultural environment or in horticulture, and which does not depend on a power supply for their operation, and which ultimately for production and for

Maintenance has a simple and inexpensive construction.

According to one aspect of the present invention, a pump is provided to add a liquid additive to a liquid stream add, the pump comprising a metering chamber having an inlet opening and an outlet opening for a liquid additive in communication, each of these openings controlled by a check valve is, wherein a first movable member is arranged in this metering chamber and distributes the liquid additive, wherein the first moveable member by means of a connecting device with a second moveable member Member operationally connected · which is in an operating chamber is arranged, wherein the second movable member divides the operating chamber into first and second operating chambers, each of the first and second Operating chambers have a corresponding opening for connection to a supply "of operating fluid, wherein an operating switching device for controlling dep supply of Betriebsf1uid is provided to the openings of the first and second operating chambers, the operating switching device acts so that when one of the first and second operating chambers is supplied with operating fluid, the corresponding other operating chamber is evacuated, the successive switching of the operating switching device causes the connecting device to go back and forth and thereby distribute the measured quantities of liquid addition from the dosing chamber /, the operating switching device is fluid-operated, and a trip device is mechanical with the reciprocating device Connecting device connected and is operationally by means of fluid couplings with the fluid-actuated operating shell t device coupled, wherein the! öseschalteinrichtung and the fluid operated switching device, the coupled in this manner are operated so that at the end of each stroke of the reciprocating linkage the fluid-operated switching device

is operated to supply operating fluid from the to change one to the other operating chamber.

In the preferred embodiment, the first is moveable Link a piston, the dosing chamber is arranged inside a dosing head, the second is movable Member is a membrane or an oscillating wall, the operating chambers are defined by an operating head, and the The connecting device comprises a piston rod device which is coupled to the two moveable members is.

Embodiments of such a pump have been designed that are either hydraulic or pneumatic Activity work, d. H. either with a liquid, for example water, or with air as the operating fluid, which is fed to the first and second operating chambers or evacuated therefrom.

In a special application, especially in a water purification system for supplying purified water for household purposes in isolated villages in underdeveloped Areas, the operating fluid can be the water to be purified. This water can for example by means of a diesel pump can be pumped to a reservoir in the village and the pressure of the water passing through can be used to drive this pump for the additives (for example, an agent for purifying water). It it should be noted that in this case, the water evacuated from the first and second operating chambers directly is led back to the source, whereby the valuable substance water is not lost.

On the other hand, the pump can be operated pneumatically, for example in industrial environments where usually Compression air in excess is available to operate an industrial plant. In this case can the air from the first and second operating chamber

released into the atmosphere after the air volumes used by this pump are relatively small.

In a preferred embodiment, the fluid operated Switching device a solenoid valve or a slide valve, which is under field control by the trigger switch teinrichtung is actuated, wherein the trigger switching device the application of trip operating fluid from the trip switch to the fluid operated switch controls and thereby selects which of the first and second operating chambers is supplied with operating fluid will.

In the preferred embodiment, the trigger switch is a spool valve or a slide valve which, by field control, controls the fluid-operated switching device controls and which self is mechanically operated to its state at each end of each stroke of the reciprocating connector by means of operating stops to change which of the reciprocating Connection device are assigned.

It should be noted that the chambers in the actuating head and in the dosing head can be proportioned relative to one another (i.e. the effective piston area and the diaphragm area can be proportioned relative to one another) to ensure that the pressure of the dispensing head leaving the Additive for injecting the additive into the liquid into which it is to be mixed, 30th

sufficient. It should be noted that the outlet of the dosing head is connected to a vessel or a pipe system can be over which the liquid flows. Typical values of the mechanical advantage obtained with the inventive Pump can range between 11: 1 down to 2.5: 1. A ratio of 11: 1 indicates that the pressure of the liquid to be metered can be 11 times greater than the pressure of the operating fluid. It represents an advantageous feature of the construction

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tion of the device according to the invention that the size of the dosing head and the piston connected to it may be a customizable unit, the remainder of the structure defining the pump can consist of standard parts.

The pump defined above with a single dosing head can be referred to as a "simplex" pump. By Addition of a second dosing head, which has a second connection device which is operationally with connected to the limb, a "duplex" pump can be created, the pump being able to transfer additives to be measured for each of the two dosing heads. The additives dosed via the two dosing heads can be the same Be additions, for example to two different ones Liquid flows, or different additives, for example to the same liquid flow. the The dosing capacity of the two dosing heads can be the same or different.

_v The volume of the additive flowing through the or each dosing head each time the dosing head is actuated can be adjustable. For this purpose, the connection between the member of the dosing head and the member of the operating head can comprise a coupling with backlash or with dead play, whereby the effective stroke of the connecting device can be adjusted. The coupling with loss of stroke or dead play preferably has a calibration device which has a visual

Display of the dosing speed of the dosing chamber for there are different settings of the clutch with dead play.

The following is an example of an embodiment of the invention with reference to the accompanying drawing, which is a sectional view of a pump for Feeding a liquid additive to a liquid stream shows.

In the drawing there is a "simplex" pump for feeding a liquid additive to a liquid flow shown. A dosing head 10 defines a dosing chamber 11, which is in communication with an inlet opening 12 and an outlet opening 13 for a liquid additive. Each of the openings 12, 13 is controlled via a corresponding check valve 15. A first changeable one Member 20, which has the shape of a piston member, is arranged in the metering chamber 11 and distributes the liquid additive through the outlet opening 13. This The first changeable member 20 is operationally via a connecting device 30 (which will be described in more detail below is described) connected to a second moveable member 40, the latter in an operating chamber 50 is arranged. The second movable member 40, which has the shape of a diaphragm or a vibrating Has wall is arranged so that it divides the operating chamber 50 into a first and a second operating chamber 51, 52. One each def "first and second operating chambers 51, 52 has a corresponding opening 53, 54 in order to be connected to a supply of operating fluid 55 stand. An operating switching device 60 controls the supply of operating fluid 55 to the openings 53, 54 of the first and second operating chambers 51, 52. This operating switching device 60 is effective in such a way that when the first or second operating chamber 51, 52 "via the supply line 61 is supplied with operating fluid, the corresponding other operating chamber 51, 52 via the evacuation line 62 is evacuated. Successive switching of the operating switching device 60 causes this a reciprocation of the connecting device 30 and thereby also causes the distribution of measured quantities of liquid additive from the metering chamber 11. The operating switch device 60 is fluid-actuated, i. H. the Pressure in the control lines 81, 82 (to be described below) controls the position of the one therein Spool or spool valve. The trip switchgear 70 is (as described below) with the back

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and the forward connecting device 30 mechanically connected. The trip switch 70 is operational by means of fluid couplings via lines 81 to 85 with the Operating switching device 60 coupled. The trip switchgear 70 and the operating switching device 60 can be operated so that at the end of each stroke of the back and forth The forward connecting device 30 is the operating switching device 60 is actuated to supply operating fluid 55 from one of the inlets 53, 54 to the other To change input and thereby from one of the operating chambers 51, 52 to the other operating chamber.

The operating chambers 51, 52 are through an operating head

90 defines which, as can be seen from the drawing

is comprised of two parts 91, 92 which are screwed together at 93 and between them clamp the membrane means 40 (of the second moveable member) around its periphery. The two operating head parts 51, 52 are shaped so that they "define therebetween the chamber 50 _s which i through the membrane device 40> n, the operating chambers 51 is divided 52nd The membrane device 40 is provided with stiffening discs 41, which in a clamped together position by means of the locking device 42 which is threadedly connected to a portion 32 of the connecting device 30. In addition, the head parts 91, 92 are shaped so that they define passages 95, 96 which at their outer ends receive connecting pieces 97, 98 in a threaded manner Connecting pieces 97, 98 connect the lines 63, 64 to the operating head 90 and also define the aforementioned openings 53, 54. In addition, the part

91 is provided with a passage 94 which receives a guide piece 99 in thread engagement therewith. That Guide piece 99 guides the connecting device 30 into

inside the head part 91. O-ring seals 18 are arranged in the passage 94 and interact with the guide piece 99. It should be noted that the head part 92, as shown _{5 has} a recess which with the

Passage 94 is axially aligned with end 37 of connector 30 as it moves to the right (in the drawing). From the previous general comments regarding a "duplex" pump it is clear that for such a pump the operating head part 52 would also have a passage 94, which / ^ i would extend through the outer wall of the same to the corresponding connector 30 for a further Take up dosing head 20 (not shown).

The connecting device 30 comprises piston rod devices 31, 32, which each with the changeable Members (i.e., the piston and diaphragm) 20, 40 are connected. As shown are the piston rod assemblies 31, 32 assigned to a main piston rod part 33. Part 33 is with the piston rod assembly 32 directly connected and thereby with the membrane device (second movable member 40). Part 33 is connected to the piston rod device 31 by means of a coupling with dead play, which comprises the members 34, 35, by adjusting the member 35 relative to the part 33, the size of the dead game is determined. As you can see, the front end 36 of the part 33 protrudes into an axial recess in the part 31, this ensures that the Late 36 is supported at all times. However, if the part 33 is moved forward (to the left in the drawing), so no movement of the part 31 (and thereby of the piston or first moveable member 20) occurs until

the link 35 on link 34 of the coupling with dead play an-30

beats. As can be seen, member 35 is threadedly engaged at 38 with portion 33, thereby increasing the size of the dead game can be varied. In this way, the volume is distributed by the dispensing head with each actuation

Additional adjustable. By varying the position of the 35th

Link 35 relative to part 33, the effective stroke of the connecting device 30 is set.

As can be seen, the coupling formed by the links 34, 35 with dead play is assigned a calibration device, which includes a threaded member 111 which is threadedly threaded provided passage in member 34 is engaged and with respect to an associated passage 112 in member 35 is freely movable. This member 111 carries a pair of calibration disks 113, 144. The calibration indicator is located on part 33 of the connecting device 30 115 which is then threadedly engaged on threaded portion 38. The order of the calibration discs 113, 144 relative to the calibrated Indicator 115 allows the dosing capacity of the dosing head 10 for each of a series of settings of the clutch (34, 35) with dead play can be read.

It will be noted that the dosing head 10 receives the piston or the movable member 20 in its cavity 11. The dosing head is found to be v10 at 122 attached to a reinforcement or a frame 120 which is attached to the operating head 90 by means of further bolts 121 is. Inside the dosing head 10 passages are provided which are provided with a thread to the Members 16, 17 containing the check valves 15 include. The O-ring seals 18 seal the connections between the links 16, 17 and the dosing head 10 away. Similarly, within the chamber 11, the piston 20 carries piston rings 21 in order to provide a seal the chamber 11 to ensure. The piston 20 is guided over a guide piece 29.

The fluid operated switch 60 is a spool valve or a slide valve. It is under field control actuated by the trip switch device 70. The trigger scarf The device 70 has a coil 77 (it could also be a slide). The position of this coil 77 (which is determined as described below)

the internal state of the trip switchgear is correct 70. This internal condition determines whether trigger pressure fluid got out of the opening 71 or the opening 72 and so into the switching device 60 via a corresponding Line 81 or 82 arrives. When the release pressure fluid flows along the line 81, the internal state of the switching device 60 is such that operating fluid 55 to the line 63 and from here to the operating chamber 51, while the pressurized fluid in the chamber 52 is evacuated can, after the line 64 is now in connection with the evacuation line 62. However, if the switching device 70 changes its internal state, the release fluid pressure becomes then fed along line 82. This causes the internal state of the switching device 60 changes. As a result, the line 64 is connected to the line 61, so that the chamber 52 is pressurized is, while the chamber 51 is evacuated, after the line 63 is now coupled to the evacuation line 62 is. In this way, the state of the trip switch controls 70 the application of tripping operating fluid from the trigger switching device 70 to the switching device 60 and thereby the selection of which of the first and second operating chambers 51, 52 is supplied with operating fluid 55 will.

The trip switch device 70, which also has a coil or spool valve is itself mechanically operated to its state at each end of each stroke

of the reciprocating connector 30 to än-30

to the. On the spool 77 (it could also be a slider) is acted upon by means of / stops 131, 132 which are so arranged are that they are a corresponding end of the spool 77 at the transition point in the movement of the connector 30 contact and move. The stop 131, which

rather in the case of the present embodiment of is formed by a bolt, is carried by the link 35 of the coupling with dead play and is adjustable relative thereto, whereby the switching point can be set. Of the

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Stop 132 is carried by a link 133. The member 133 is slidably disposed on the connector piece and fastened to it adjustably by means of a fastening device 134. After the position of the limb 133 can be adjusted relative to part 33, as well as link 132 relative to link 133, it follows from this, that the switching point of the switching device 70 also can be adjusted or tuned relative to the corresponding Transition or end of the stroke of the connector 30. As noted, the direct contact causes the coil 77 with one of the stops 131 or 132 that the position of the coil changes with respect to its housing. In as a result, the state of the switching device 70 changes with the resulting change in the trigger pressure fluid between lines 81, 82 (as described above). The trip switch device 70 has five openings 71 to 75, which are connected to lines 81 to 85. The lines 81, 82 are already been declared. Line 85 is the pressure fluid supply line and is connected to the main supply line 61. Lines 83, 84 are output lines to the Discharge or venting of the corresponding lines 81, 82 when the other of these lines is under pressure, and these lines 83, 84 are connected to the main evacuation line 62.

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Claims (1)

B4TEN14NI4 ^ LTE ™ BRQSE ^{D Ko} BROSE ~ D-8023 Munchen-Pullach, Wiener S ^ rT ^ Tel £ (0B9 | 7 Sf SO 7ί. Telex _o 5 212 14? Bros d; Cables: «Patentibus- Munich Type α ο Q O O O O e> «O Q Rossell Fluid Control Limited, Mead Way, Lydney, Gloucestersire ₉ England GL15 4EJ You? R'3 ^en: RFC / GER1 Jg ;. September 28th Re / pr PATENT CLAIMS ill pump for supplying a liquid additive into a liquid stream, characterized gekennzeichne t _s. that it comprises a dosing chamber which is in communication with an inlet opening and an outlet opening for a liquid additive, each of these openings being controlled by a check valve, a first movable member being arranged in the dosing chamber and distributing the liquid additive, the The first moveable member is operatively connected by means of a connecting device to a second moveable member which is arranged in an operating chamber, the second moveable member dividing the operating chamber into a first and a second operating chamber, the first and second operating chambers each having a corresponding opening for connection having a Betriebsf1uidversorgung, wherein an operation-switching means for controlling the supply of the operating fluid is provided to the openings of the first and second operating chambers _s wherein the operation-switching means so has the effect that when the first or second operating chamber is supplied with operating fluid, the corresponding other operating chamber is evacuated, the successive switching of the operating switching device a to and fro the connecting device causes and thereby a distribution of measured amounts of liquid additive effected by the dosing chamber, the operating switch device being f1uid-actuated, and a trigger switch device mechanically associated with the reciprocating connector and operationally is coupled to the fluid-actuated operating switch device by means of fluid couplings, the trigger switch device and the fluid operated switching device, the are coupled in this way where operated that at the end of each stroke of the reciprocating link the fluid operated switching device is operated in order to supply operating fluid from one to switch to the other Chamber of Operations. 2. Pump according to claim 1, characterized in that the the first moveable member is a piston and the second moveable member is an operating diaphragm, and that the connecting device comprises a piston rod device which is coupled to both moveable members is. 3. Pump according to claim 1 or 2, characterized gäcennzei chnet, that the fluid operated switching device is a spool valve or a gate valve which is under fluid control is actuated by the release switching device, wherein the trip switch means the application of trip operating fluid from the trip switch to the fluid operated Switching device controls and thereby selects which of the first and second operating chambers is supplied with operating fluid. 4. Pump according to one of claims 1 to 3, characterized in that that the trip switch device is a coil valve til or a slide valve which is controlled by fluid the fluid-operated switching device controls and which itself is mechanically operated to its state at each end of each stroke of the reciprocating To change connecting device by means of actuation attachments, which of the reciprocating connecting device assigned. 5. Pump according to one of claims 1 to 4 _S, characterized in that the dosing chamber is arranged within a dosing head, and that the first and second chambers are defined by an operating head. 6. Pump according to claim 5 _9, characterized in that it is provided with a single dosing head. , 7. Pump according to claim 5, characterized in that it is provided with a second dosing head, which has a second connecting device which corresponds to: the same moveable link with the second moveable >
bar link, which is assigned to the operating chambers, connects, the pump is able to zuzubemes- liquid additives via each of the two dosing heads sen.
25th 8. Pump according to one of the preceding claims, characterized in that the volume of liquid addition, which is distributed over or over each metering chamber with each actuation thereof, by means of a variable Coupling with dead play is adjustable, which of the connecting device between the respective moveable member and the second moveable member, which the operating chamber is assigned, is assigned, with a change in the dead play of the clutch a Adjustment of the effective stroke of the corresponding connecting device causes. 9. Pump according to claim 8, characterized in that the or each coupling with dead play has a calibration device which provides a visual indication of the dosing rate of the dosing chamber for different ones Settings of the corresponding coupling with dead play there.