WO2012168157A1

WO2012168157A1 - Device for metering lubricants into the machining of metal

Info

Publication number: WO2012168157A1
Application number: PCT/EP2012/060398
Authority: WO
Inventors: Werner Studer
Original assignee: Werner Studer
Priority date: 2011-06-08
Filing date: 2012-06-01
Publication date: 2012-12-13
Also published as: EP2718569A1; US20140224832A1

Abstract

The pump block (10) of a metering pump (1) for metering liquids (21) comprises a first feed channel system (11) for the liquid to be delivered; a metering chamber (12) connected to said feed channel system; a pumping channel (13); a metering piston (14) arranged in a displaceable manner along an axis (142) in the metering chamber, said metering piston (14) being designed to pump a particular quantity of liquid present in the metering chamber through a check valve (131) into the pumping channel in the event of a displacement in a direction along said axis (142); and an actuator device (16) for moving the metering piston along said axis (142). The pump block has a cylindrical or frustoconical housing casing (15), wherein the feed channel system (11) opens in to at least one opening (111, 111') arranged in the housing casing.

Description

DEVICE FOR THE DOSE OF LUBRICANTS IN SPANISH METAL WORKING

Technical Field This invention relates to metering pumps for liquids, particularly lubricants, and to lubricant metering devices for minimal quantity cooling lubrication in metalworking.

State of the art

In machining metalworking, it is usually necessary to cool and / or lubricate the tool during machining in order to achieve the necessary quality and to increase the service life of the tool. A combined cooling and lubrication can be achieved for example with conventional emulsion cooling lubrication. The cooling emulsions used for this contain about 3 to 6% by volume of oil-like lubricant in water. Relatively large amounts of cooling emulsion are required, which, moreover, have to be disposed of in a complicated manner due to their composition and may be harmful to health. The amount of lubricant required can be reduced with minimum quantity cooling lubrication. In this case, small amounts of viscous lubricant / cutting oil are conveyed at regular intervals in a continuous air flow and selectively applied over a short distance as a spray on the tool and / or the workpiece. The air flow is used for cooling. The lubricant is applied directly in the cutting area. The required amounts of lubricant are much lower than in conventional cooling emulsion. Accordingly, the operating costs are lower. Further advantages of the minimum quantity cooling lubrication are higher cutting speeds, dry workpieces, a lower environmental impact and a smaller cleaning effort. Since the chipped material also remains dry, it is easier to recycle. Furthermore, no harmful emulsion nebulas or vapors are formed, which increases job security. To transport the viscous lubricant to the destination, small amounts of the lubricant are introduced into and entrained in a continuous stream of compressed air. This is done for example with a coaxial metering, in which an inner nozzle for the lubricant is disposed within an outer annular nozzle for the compressed air. In a known system, the lubricant is pneumatically conveyed, with pneumatically actuated metering pumps, which promote specific, small amounts of lubricant at a certain frequency via a delivery line to the nozzle and there in the air flow. In this case, a separate metering pump is used for each metering.

Such pneumatic metering pumps are known, for example, from US Pat. No. 3,888,420 and US Pat. No. 4,125,176. In these metering pumps, a metering piston is displaced by a compressed air pulse in a metering chamber filled with the viscous lubricant to be delivered, whereby a defined amount of liquid is forced through a check valve into a delivery line. At the other end of the delivery line, the same amount of liquid is correspondingly expelled through a coaxial nozzle into a continuous stream of compressed air, where it is entrained and thereby deflected and reaches the tool.

FIG. 1 shows an example of such a metering pump 1 from the prior art. In a cuboid pump body 10, a cylindrical metering chamber 12 is arranged in the direction of the longitudinal axis 1101. This is completed on one side with a check valve 1 31, and connected on the other side with a supply channel system 1 1. The supply channel system 11 serves to supply the liquid 2 1 to be metered, ie the lubricant, into the metering chamber 1. Along the longitudinal axis 1 01, a metering piston 1 3 is displaceably arranged, which can be actuated by a pneumatic actuator device 1 6. This comprises an active with the metering piston 1 4 Aktuatorkolben 1 63, which is slidably disposed in an actuator cylinder 1 62 in the longitudinal direction 1 01. The actuator cylinder 1 62 is connected to a supply channel system 1 7 for the pneumatic medium, usually compressed air. Without pressurization of the actuator, a return spring 1 61 presses the actuator piston in the actuator cylinder in the basic position (in the example shown to the left). The front end 1 41 of the metering piston is in a position in which the lubricant 2 1 from the supply channel 1 1 can flow into the metering chamber 1 2. If now the actuator cylinder 1 62 pressurized via the supply channel 1 7, so the actuator piston 1 63 moves in the cylinder to the right, and with him the metering piston 1 4, to the intended end position. In the process, the dosing piston firstly closes off the dosing chamber from the supply channel 11, and then presses the viscous lubricant contained therein through the check valve 1131 into the pumping channel 13, and the lubricant supply line 45 connected thereto.

Since the metering pump and thus the cross section of the Aktuatorkolbens is relatively small, the pressure must be correspondingly large in order to achieve the necessary force. Several bars may be necessary. The pressurization takes place as a short pulse, which is generated by a corresponding pressure pulse generator (not shown). After the end of the pressure pulse, the return element 1 61 moves the metering piston 1 4 again to the left. The check valve 1 31 closes, and liquid 2 1 flows into the chamber 1 2 after.

At the longitudinal end of the actuator 1 6, a knob 1 65 is provided, with which the actuator can also actuate manually, by pressing the button.

In the exemplary embodiment illustrated, the position of the metering piston with respect to the actuator piston 1 63 can be adjusted and adjusted in the longitudinal direction to a certain extent. For this purpose, the metering piston is extended beyond the Aktuatorkolben and provided with an external thread 1 64. The external thread is screwed into a corresponding continuous internal thread of the actuator piston, and the two elements are connected in a form-fitting manner. By turning the knob 1 65, the metering piston rotates in the thread of the Aktuatorkolbens, and moves accordingly in the longitudinal direction 1 01. The basic position and the end position of the actuator piston in the actuator cylinder, and thereby also the stroke of the metering piston, are determined by corresponding stops. By moving the metering piston, however, the basic position and the end position of the metering piston can now be adjusted, and thus the actual effective stroke within the metering chamber, which determines the volume of lubricant delivered per stroke.

For lubricant metering devices with multiple lubrication nozzles, the necessary metering pumps are preferably supplied via a common lubricant supply. From US 5725071 a particularly compact built device is known, in which the metering pumps are mounted stacked. Dosing pumps for such devices, such as the pump of Figure 1, must be designed accordingly. The feed channel system 1 1 for the liquid 2 1 in such a metering pump has two opposing parallel, flat side walls 1 02, 1 02 'an opening 1 1 1, 1 1 1' on. A recess 1 03, 1 03 'around the opening around which serves to receive a sealing element in the form of an O-ring.

Several identical individual metering pumps 1, 1 a, 1 b designed as cuboid pump blocks 10 are assembled into a stack, as shown schematically in FIG. 2, in a cross section through the supply channel 11. The openings 1 1 1, 1 1 1 'of the feed channel system are arranged so that when stacking the pump blocks, the openings of adjacent metering pumps are superimposed, with an O-ring 1 04 or other suitable sealant provides a sealing connection. For the pump stack 42 thus results in a continuous supply line, comprising the sealingly connected individual feed channel systems 1 1. At the lower end, the supply line is closed by a closing block 41 4, at the upper end by a connection block 41 5 for the supply line 46, which is connected to a reservoir 43 for the liquid. From the reservoir 43, the liquid flows gravitationally driven to the pump. Alternatively, the delivery into the supply line can be effected by a constant pressurization.

Similarly, in the metering pump 1 of Figure 1, the supply channel system 1 7 for the pneumatic medium designed so that when stacking several metering pumps results in a common supply line. In this way, several metering pumps can be actuated simultaneously, by a single compressed air pulse. The pump blocks 1 0 of the standardized metering pumps 1, 1 a, 1 b are arranged in the example shown between two clamping plates 41 3, 41 and the nuts 41 1 by means of clamping bolts 41 and the pump blocks 1 crimp along the stack axis non-positively and positively. This allows a cost-effective production of the entire lubricant metering device 4, wherein the number of pumps can be changed as needed. The individual lubricant dosing devices can be efficiently adapted to individual customer requirements. Only the length of the clamping bolt 41 0 must be selected accordingly.

The pump stack of such a conventional metering device is easy to assemble. If, however, during operation, a malfunction of a single metering pump, and this must be replaced if necessary for repair, the entire pump stack 42 must be emptied, disassembled and disassembled. This leads to expensive downtime of the affected NEN machine tools. Correspondingly large is also the risk that actually due maintenance cycles will fail, which can later lead to greater disruption.

OBJECT OF THE INVENTION It is an object of the invention to provide metering pumps for liquids, in particular lubricants, and lubricant metering devices for metal cutting machining, which do not have the problems of the prior art.

In particular, such lubricant metering devices should be able to be constructed individually and efficiently. The individual metering pumps of such a lubricant metering device or their faster-wearing parts should be able to be replaced quickly and easily.

Another object of the invention is to provide lubricant metering devices and metering pumps for such devices in which shorter downtime due to maintenance work is incurred. Such lubricant metering and metering pumps should also be efficient and inexpensive to produce.

These and other objects are achieved by a lubricant metering pump according to the invention and a lubricant metering device according to the invention, according to the independent claims. Further advantageous embodiments are given in the dependent claims.

Presentation of the invention

A metering pump for metering liquids according to the invention has at least one pump block, comprising a first feed channel system for the liquid to be conveyed, a pump channel, and a pump device for pumping the liquid from the feed channel system into the pump channel. The pump block has a housing jacket in the form of a cylinder or a truncated cone, wherein the supply channel system opens into at least one opening arranged in the housing jacket. Advantageously, the pumping device of the metering pump has a metering chamber connected to the first supply channel system, a metering piston displaceably arranged in the metering chamber along an axis and an actuator device for moving the metering piston along said axis, wherein the metering piston is adapted to move in one direction along the said axis to pump a certain amount of liquid present in the metering chamber through a check valve in the pumping channel.

Likewise advantageously, the actuator device of the metering pump is adapted to operate the metering piston electromagnetically or pneumatically.

A particularly advantageous variant of a metering pump according to the invention has a pneumatic actuator device which can be operated by a pneumatic medium, in particular compressed air, and a second supply channel system for the pneumatic medium for operating the pneumatic actuator device. Said second supply channel system opens into at least one opening arranged in the housing jacket.

The actuator device may have a return element for the metering piston, for example a return spring.

A particularly advantageous embodiment of a metering pump according to the invention has a mounting block with at least one receptacle which is adapted to the shape of the housing shell of the pump block. In the receptacle, the pump block can be arranged flush. Such a metering pump may comprise means for fixing the pump block in the receptacle of the mounting block. Advantageously, such a metering pump comprises a recess, in particular a circumferential groove on the housing shell of the pump block, and arranged in a through-threaded hole in the mounting block screw, wherein the groove, the threaded bore, and the screw are configured and arranged such that at a mounted pump block the screw with the groove reversibly engageable and so the pump block in the mounting block in the direction of the longitudinal axis is reversibly positively fixed. Particularly advantageously, the screw is made of a material which has a lower hardness than the casing of the pump block. For example, if the jacket is made of steel or brass, then the screw can be made of a polymer, for example. The assembly block of an advantageous Ausführunsgform such inventive metering pump has a third supply channel system for the liquid. On the wall of the receptacle is provided a first circulating groove which is connected to the third supply channel system. The N ut is arranged such that the at least one opening of the first supply channel system of a pump block arranged in the mounting block overlaps with the first circumferential N ut, so that the first and third supply channel system form a continuous liquid supply channel system.

The mounting block of another advantageous Ausführunsgform such inventive metering pump has a third supply channel system for the liquid, which opens into at least one opening arranged in the wall of the receptacle. On the housing shell of the pump block arranged in the mounting block, a first circulating groove is provided, which is connected to the first supply channel system. The N ut is arranged such that the at least one opening of the third supply channel system overlaps with the first circumferential N ut so that the first and third supply channel systems form a continuous liquid supply channel system. Such metering pumps particularly advantageously have sealing elements which are arranged in the receptacle of the mounting block and / or around the housing jacket of the pump block along the circumference. These are suitable for sealingly connecting the at least one opening of the first supply channel system or of the third supply channel system and the first circumferential groove. The metering pump mounting block may include a fourth pneumatic medium supply duct system, and a second circumferential groove connected to the fourth supply duct system on the wall of the receptacle. The N ut is arranged such that the at least one opening of the second supply channel system of a pump block arranged in the mounting block overlaps with the second circulating N ut so that the second and fourth supply channel systems form a continuous pneumatic medium supply duct system.

Likewise, in another embodiment, the mounting block of the metering pump may comprise a fourth supply channel system for pneumatic medium, which opens into at least one opening arranged in the wall of the receptacle. Provided on the housing jacket of a pump block arranged in the mounting block is a second circumferential groove which is connected to the second supply channel system and which is arranged in such a way that the at least one opening of the fourth supply channel system overlaps with the second circumferential groove. The second and fourth supply channel systems thus form a continuous supply channel system for pneumatic medium.

Also in this case, it is particularly advantageous if such metering pumps have sealing elements which is arranged in the receptacle of the mounting block and / or around the housing shell of the pump block along the circumference, and which are adapted to the at least one opening of the second supply channel system or fourth supply channel system and the second circumferential groove sealingly connect.

Advantageously, the mounting block of a metering pump according to the invention has two parallel, planar walls. Such a metering pump has the advantage that it can be mounted stacked to save space.

In a particularly advantageous variant of the mounting block has two parallel, planar walls, and the third supply channel system opens on both walls in an opening. The two openings are arranged such that an opening coincides with a corresponding opening of another identical metering pump, when the two metering pumps are placed with the walls on top of each other.

Similarly, the mounting block may have two parallel, planar walls, and the fourth supply channel system opens into an opening on both walls, wherein the two openings are arranged such that an opening coincides with a corresponding opening of another identical metering pump when the two metering pumps with the Walls are laid one on top of the other.

A lubricant metering device according to the invention has at least one metering pump according to the invention.

In an advantageous variant, a lubricant metering device according to the invention comprises two or more metering pumps according to the invention, these having a mounting block with a receptacle which is adapted to the shape of the housing shell of a pump block of the metering pump, and in which the pump block is arranged flush and fixed.

In a particularly advantageous embodiment, two or more metering pumps are arranged in a stack in such a lubricant metering device according to the invention. in each case two parallel, planar walls of the mounting blocks of two adjacent metering pumps are flush with each other. Such a lubricant metering device may further comprise a reservoir for the liquid, a common supply channel system of the metering pumps for the liquid and a shut-off valve for reversibly separating the supply channel system from the reservoir.

Advantageously, in such an embodiment of a lubricant metering device according to the invention, means are provided for releasably connecting the mounting blocks of two adjacent metering pumps. Particularly advantageously, these connecting means comprise clips or clamps which are operatively connected to the assembly blocks to be connected.

Preferably, these clips or brackets are designed such that when you create the effective connection of the clips or brackets with the mounting blocks to be joined, the mounting blocks are braced against each other.

Brief description of the drawings

For a better understanding of the present invention, reference will now be made to the drawings, which show only embodiments of the subject invention.

Figure 1 shows schematically a longitudinal section through a pneumatic lubricant metering pump, as it is known from the prior art.

Figure 2 shows schematically a cross section through lubricant metering devices with a plurality of stacked metering pumps, as known from the prior art.

Figure 3 shows schematically an embodiment of a metering pump according to the invention, (a) as a longitudinal section through the pump block alone, (b) as a longitudinal section through the mounting block alone, (c) as a cross section through the mounting block alone along plane AA, and (d) as a longitudinal section through Assembly block and pump block in assembled condition.

Figure 4 shows schematically a cross section through two metering pumps of Figure 3, in a stacked arrangement. FIG. 5 schematically shows a detail of an embodiment of a metering pump according to the invention, with a longitudinal fixing of the pump block in the assembly block.

FIG. 6 shows schematically a detail of an embodiment of a metering pump according to the invention, with a lateral fixing of the pump block in the assembly block.

Figure 7 shows schematically a variant of a metering pump according to the invention, in which the circumferential grooves of the feed channel systems are arranged on the cylinder jacket 1 5 of the pump block, (a) as a longitudinal section through the mounting block and pump block in the assembled state, and (b) as a longitudinal section through the mounting block alone.

Figure 8 shows schematically a longitudinal section (a) by a particularly advantageous variant of a metering pump according to the invention, and (b) by the mounting block alone.

Figure 9 shows a side view of the pump block of still another particularly advantageous

Embodiment of a metering pump according to the invention.

FIG. 10 shows a mounting block suitable for the pump block from FIG. 9, (a) in a plan view of the mounting block, (b) in a side view onto the mounting block, (c) in a longitudinal section through the two side walls of the mounting block along plane AA, (FIG. d) in a cross-section through the plane B-B, (e) in a cross-section through the plane CC, and (f) in a cross-section through the plane D-D.

FIG. 11 shows an advantageous clip for positive and non-positive connection of two dosing pumps according to the invention, (a) in plan view, and (b) in a section through plane F-F.

Figure 1 2 shows another mounting block, matching the pump block of Figure 9, with a

Connection for a reservoir and a stopcock, (a) in a plan view of the mounting block, (b) in a side view of the mounting block, (c) in a longitudinal section through the two side walls of the mounting block along plane AA, (d) in a cross section through the plane CC, and (e) shows a shut-off valve for the lubricant supply. Figure 1 3 shows a cross section through a metering device according to the invention, with a reservoir and a respective metering pump according to the invention from Figure 1 2 and Figure 1 5, in a stacked arrangement.

Figure 1 4 shows another possible mounting block, matching the pump block of Figure 9, with two receptacles for pump blocks, (a) in a plan view of the mounting block, (b) in a side view of the mounting block, (c) in a longitudinal section through the both side walls of the mounting block along plane AA, (d) in a cross section through the plane BB, (e) in a cross section through the plane CC, and (f) in a cross section through the plane D-D.

Figure 1 5 shows a schematic cross section of yet another advantageous embodiment of a mounting block fitting to the pump block of Figure 9, with receptacles for two pump blocks and with a connection for a reservoir and a stopcock.

Embodiment of the invention

The examples given below are given for a better illustration of the present invention, but are not intended to limit the invention to the features disclosed herein.

An advantageous embodiment of a metering pump according to the invention is shown schematically in FIG. The metering pump consists of a substantially cylindrical pump block 1 0, which is arranged in a suitably shaped mounting block 30.

The pump block 1 0 includes the actual pneumatic pumping device, which corresponds to the pumping device of Figure 1 from the operating principle. In the direction of the longitudinal axis 1 01, a cylindrical metering chamber 1 2 is arranged in the pump body 1 0, which is closed on one side with a check valve 1 31 and connected on the other side to a supply channel system 11. A metering piston 1 4 is slidably disposed along the longitudinal axis, and is actuated by a pneumatic actuator device 1 6. This comprises an active with the metering piston 1 4 Aktuatorkolben 1 63, which is arranged in an actuator cylinder 1 62 slidably in the longitudinal direction. The actuator cylinder 1 62 is connected to a supply channel system 1 7th connected to the pneumatic medium. Without pressurization of the actuator, a return spring 1 61 presses the actuator piston in the actuator cylinder in the home position (as shown).

If the actuator cylinder 1 62 is pressurized, then the actuator piston 1 63 and the metering piston 1 4 shifts to the right, and the viscous lubricant in the metering chamber 1 2 is through the check valve 1 31 in the pumping channel 1 3 and the lubricant supply line 45 pressed. In the example shown, the lubricant delivery line 45 is sealingly connected to the pump block 10 via a corresponding threaded connection piece 451.

After the end of the pressure pulse, the return element 1 61 moves the metering piston 1 4 back to the left back to the basic position. The check valve 1 31 closes, and liquid flows from the supply channel system 1 1 in the chamber 1 2 after.

At the longitudinal end of the actuator 1 6, a knob 1 65 is provided, with which the actuator can be actuated manually. The position of the metering piston with respect to the actuator piston 163 can be adjusted longitudinally to accommodate the effective stroke within the metering chamber. The metering piston, which is extended beyond the actuator piston, is provided with an external thread, which is screwed into a corresponding internal thread of the actuator piston. By turning the knob 1 65, the metering piston shifts relative to the Aktuatorkolben.

The mounting block 30 has a cuboid outer shape. The dosing pump can therefore be mounted stacked analogous to the one-piece metering pumps according to FIG. Within the assembly block, a cylindrical cavity is provided in alignment with the longitudinal axis 1 01, which serves as a receptacle 31 for the cylindrical pump block 10. A first longitudinal opening 3 1 2 serves as an insertion opening for the pump block 1 0 in the mounting block 30. A second longitudinal opening 31 3 allows access to the connection for the delivery line 45th

In the mounting block 30, 31 two circumferential grooves 33, 36 are arranged on the inner wall 31 1 of the receptacle. These grooves or grooves are connected to a third 32 and / or fourth supply channel system, which are arranged in the mounting block. In the example shown, the block-shaped mounting block 30 on two opposite walls 302, 303 has two openings of the third supply channel system 32 for the liquid to be pumped. Likewise, two corresponding openings of the fourth supply channel system 35 are provided for the pneumatic medium. The openings of the third and fourth supply channel system are arranged so that in a stacked arrangement of the same metering pumps according to the invention, the mutually corresponding openings of adjacent metering pumps are superimposed. O-rings 104 or other suitable sealing means are disposed in corresponding circular recesses 103, and provide a sealing connection between the individual metering pumps.

The position of the recesses 33, 36 in the lateral surface 3 1 1 of the receptacle 31 is selected in the illustrated embodiment so that in the finished together mounted metering pump 1, the openings 1 1 1, 1 1 1 ', 1 7 1, 1 71' of the first supply channel system 1 1 and the second supply channel system 1 7 on the lateral surface 1 5 of the pump block 1 0 on the corresponding grooves 33, 36 on the inner wall 3 1 1 lie. I n longitudinal direction 1 01 are seen on both sides of the openings 1 1 1, 1 1 1 'and 1 71, 1 7 1' circumferentially around the cylinder jacket 1 5 of the pump blocks 1 0 sealing elements 331, 331 'and 361, 361' arranged. In the example shown, these are O-rings, which are arranged in corresponding recesses on the lateral surface 1 5. Said sealing elements ensure a sealing connection between the first 1 1 and third 32 supply channel system and the second 1 7 and fourth 36 supply channel system. Thus, within the metering pump 1 results in a continuous supply channel system 1 1, 3 1, 32 for the liquid to be conveyed, as well as a continuous supply channel system 1 7, 35, 36 for the pneumatic fluid.

A major advantage of such an embodiment of the inventive metering pump 1 is the fact that the assembly of the pump block in the mounting block with respect to the rotational position about the longitudinal axis 1 01 can be done in any position. Regardless of the rotational orientation of the pump block 10, a continuous connection is ensured via the grooves 33, 36. This facilitates the installation of the pump block 1 of a metering pump 1 according to the invention, which essentially has to be inserted only in the receptacle of the mounting block, up to the longitudinal stop 3 1 4.

The housing shell 1 5 of the pump block 1 0 and the receptacle 3 1 of the mounting block 30 advantageously have the least possible clearance. Thus, the sealing rings and their mounting grooves can be dimensioned such that the sealing rings are as little plastically deformed at a mounted metering pump and have a correspondingly longer life. In practice, the manufacturing tolerance of jacket 1 5 and receptacle 3 1 to 5 microns is advantageous. rometer or less. Such exact dimensioning also requires a careful treatment of the pump block jacket 1 5 during transport and assembly accordingly.

FIG. 4 shows a detail of a stack 42 of metering pumps 1, 1 a according to the invention according to FIG. 3, in cross-section through the supply channel system 11 for the lubricant. As can be seen, in one metering pump 1, the pump block 10 is aligned so that the first supply channel system 1 1 is aligned with the third supply channel system 32. In the other metering pump 1 a, however, the pump block 1 0a is rotated in comparison to the mounting body 30a. Nevertheless, however, the first supply channel system 11a is connected to the third supply channel system 32a via the circulating groove 33a. The orientation of the pump block 1 0 is not relevant to the function of the metering pump.

Such a metering pump according to the invention further makes it possible to swiftly and efficiently exchange that part of the pump which has moving parts and must be appropriately maintained, without having to dismantle a metering device 4 consisting of a plurality of metering pumps stacked in a stack, as in the prior art. It only temporarily interrupted the lubricant and pneumatic supply and the delivery lines are separated. Subsequently, the pump block is removed from the mounting block, and a new pump block with fresh sealing elements used. After connecting the delivery line and opening the supply lines, the dosing device can be put back into operation immediately. The removed pump block can then be separately reconditioned or repaired.

The inventive design of the metering pump has the further advantage that existing metering devices can be retrofitted with metering pumps according to the invention if they are designed to be compatible here by the dimensioning of the mounting block and the connection elements. When disassembling a lubricant metering device according to the prior art (for example, as in Figure 2), a defective metering pump can be replaced by a metering pump according to the invention. If later this must be revised again, but now no decomposition of the stack is more necessary, but it is only the pump block replaced.

In an alternative embodiment, the first supply channel system of the pump block could also be designed as a blind hole instead of a through hole. A single opening, which is substantially sufficient to ensure the supply of lubricant into the metering chamber. However, the use of a continuous channel has the advantage that the first time the metering pump filling the vent works better.

In the example shown in FIG. 1 2 of a metering pump according to the invention, the pump block 10 is not fixed in the longitudinal direction 110, which is not necessary since no forces occur between pump block and mounting block in the longitudinal direction. The long-side stop 3 1 4 ensures the correct positioning. In another version, however, fixing means 34 can also be provided in order to fix the pump block positively and / or non-positively in the mounting block. For example, at the first opening 31 2 a union nut, or a similar means may be provided to block the pump block in the receptacle 3 1.

Also, the pump block and mounting block may be provided with a bayonet lock mechanism, or the pump block is secured with a snap ring.

Figure 5 shows another possible variant for fixing the pump block 1 0 in the mounting block 30, in a longitudinal section through the rear end of the metering pump. In this embodiment, the connecting piece 451 is provided with a continuous external thread, which is screwed at one end into the pump block. Also arranged on the external thread is a nut 452, which is supported on the rear end of the mounting block, and thus fixes the pump block in a form-fitting manner in the receptacle of the mounting block.

Figure 6 shows an embodiment of a metering pump 1 according to the invention, in which in a slot 343 in the lateral wall of the mounting block 30, a screw 341 is provided which can engage in a designated circumferential groove 342 in the pump block, so the longitudinal position of the pump block 1 0 to fix positively in the receptacle 31. Figure 6 shows a cross section in the region of the actuator cylinder 1 62, by the circumferential Fixierungsnut 342. Such a solution is particularly advantageous because it is space-saving and inexpensive to implement. The groove 342 allows to mount the pump block without exact angular orientation in the mounting block.

The fixing screw 341 is advantageously made of a stable plastic or a soft metal. This is sufficient for the positive fixing. At the same time, it is thus avoided that when the pump block is incompletely inserted into the mounting block, the fixing screw 341 pressed into the cylinder jacket and this deformed and damaged. Since a screw 341 of plastic or soft metal has a lower hardness than the cylinder shell of the pump block, the screw is deformed instead.

A variant of a metering pump according to the invention, in which the circumferential grooves are arranged on the cylinder jacket 1 5 of the pump block, is shown schematically in FIG. Such a variant has over the embodiment of Figure 2 has the advantage that the mounting body can be made easier.

FIG. 8 shows another advantageous embodiment of a metering pump 1 according to the invention, in which a third 51 and a fourth 52 circumferential groove are arranged on the lateral surface 3 1 1 of the receptacle 31. The third nut 53 is in communication with a pumping channel 1 3 'arranged in the lateral wall of the mounting block 30 for the lubricant to be pumped, which is connected to the delivery line (not shown). The pump channel 1 3 in the pump body opens on two sides against the N ut 51st Such an embodiment of the metering pump 1 makes it possible to attach the connection for the delivery line to the mounting block 30, instead of the pump block 1 0. Accordingly, in a replacement of the pump block 1 0, the delivery line 45 can not be separated, which further simplifies the exchange.

The fourth nut 52 in turn communicates with a vent channel 53 in the lateral wall of the mounting block 30, which is open towards the outside environment. The pump block 10 has one or more bores 54, which open on the lateral surface 15 against this fourth groove 53, and with which the pressure side of the cylinder 1 62 is opposed to the volume. This has the advantage that the Aktuatorkolben 1 63 always works against external pressure, so that no relevant back pressure arises during the movement of the piston, and no heating takes place. In an advantageous variant, the groove 53 can simultaneously serve as a fixing groove 342 for a fixing screw 341 as shown in FIG. The venting channels 53, 54 are sealingly connected by sealing elements 52 1, 52 1 'circumferentially arranged on the jacket 1 5, the sealing elements 521', 331 being identical. Analog connect the sealing elements 51 1, 5 1 1 'the delivery channels 1 3', 1 3. An opening in the longitudinal end of the mounting block is used to vent the men of the mounting block when inserting the pump block. FIG. 9 shows the pump block 110 of a further advantageous embodiment of a metering pump 1 according to the invention, which is constructed similarly to the metering pump from FIG. The openings of the supply channel 1 1 for the liquid, the supply channel 1 7 for the compressed air, the venting channel 54 and the pumping channel 1 3 are arranged in a line. The individual sealing elements are not shown, so that the corresponding grooves in the jacket 15 of the pump block 362, 362 ', 522, 51 2 become visible. For the pumping channel 1 3, only one sealing element is provided to be arranged in the groove 5 1 2. As will be explained in Figure 1 0, this is sufficient for the seal, since the longitudinal end of the mounting of the mounting block 30 is designed to be closed. The pump block 10 shown can be installed, for example, in a mounting block 30 according to FIG. In this example, the venting channel 53 and the pumping channel 1 3 'open towards a first side wall 301 of the mounting block. The supply channel 35 for the compressed air is arranged parallel to the supply channel 32 for the lubricant, but does not extend through the longitudinal axis 1 01, but intersects tangentially with the N ut 36. To a second side wall 301 'of the mounting block 30 towards a branch opens 35' the supply channel 35. At the corresponding connection opening, a supply line of a compressed air pulse generator can be connected. The corresponding compressed air pulse can thus be forwarded via the supply channel 35 to the adjacent metering pumps. If the connection 35 'is not required, for example because the compressed-air pulse is being delivered by another metering pump, then the opening 35' can be sealed off by a suitable closing element (not shown).

Another advantage of the mounting block 30 shown is an advantageous, novel connection 41 of the individual metering pumps to a stack. For this purpose, two T-shaped recesses 41 6 are provided for a clip 41 2 on both side walls. The corresponding clip 41 2 is shown in Figure 1 1. In order to positively and non-positively connect with one another two metering pumps stacked on top of each other, the clip 41 2 is screwed to both mounting blocks 30. On the mounting block and the clip corresponding holes 41 9 and threaded holes 41 8 are provided. The clip is advantageously dimensioned so that when screwing a force in the longitudinal direction of the clip is formed, which braces the two mounting blocks against each other. Accordingly, it is possible to dispense with the clamping bolts known in the prior art, which reduces the space requirement of a lubricant metering device according to the invention compared with the prior art. If the outer dimensions of such a metering pump according to the invention are chosen to be suitable, then this is compatible with the conventional fastening system with clamping bolts so that, for example, existing lubricant metering devices can be retrofitted with individual metering pumps according to the invention. A special variant of such a mounting block 30 is shown in FIG. This mounting block has on the upper wall 302 a connection 43 1 for a corresponding connection element (not shown) of a lubricant supply unit. This connection 431 is connected to a supply channel arranged tangentially to the groove 36, wherein this connection can be interrupted reversibly with a shut-off valve in the form of a stopcock 44. Such a metering device 4 according to the invention with a lubricant supply unit with storage container 43 and one metering pump 1, 1a according to the invention from FIG. 11 and FIG. 15 in a stacked arrangement is shown in FIG. The reservoir 43 is essentially a known from the prior art reservoir for the minimum quantity cooling lubrication, with appropriate ventilation and filtering devices, etc., which will not be discussed here in detail. A supply line 46 opens into a connection piece 432, which is screwed into the corresponding connection opening 43 1 of a metering pump 1 according to FIG. The check valve 44 separates the reservoir 43 from the feed channel system 32. A second metering pump 1a according to FIG. 1 2 is connected to the first metering pump 1 by means of two clips 41 2. On its lower wall 303, in turn, this second metering pump 1a is closed by a closing block 414. In the example shown, this end block is screwed into corresponding bores 3 1 4 of the metering pump 1 a. Alternatively, clips could be used.

During normal operation, the shut-off valve 44 is permanently open. If a pump block is now to be exchanged, shut-off valve 44 is closed after switching off the pressure pulse generators (not shown). The pump block can be removed without having to drain the lubricant supply channel system 32. After inserting the new pump block only the valve 44 must be opened again, and the inventive metering device 4 is ready for use again.

Another variant of such a mounting block 30 is disclosed in FIG. In this advantageous embodiment, the mounting block 30 has two receptacles 31, 31 a for two Pump blocks. Each of the two receptacles 3 1, 31 a has its own connection 35 'for the compressed air supply. The compressed air can be done via one of these two statements, the other is closed. It is also possible to close both connections so that the compressed air supply takes place from an adjacent assembly block via the supply channel system 35.

Accordingly, such a mounting block 30 can also be realized with a connection 431 for the supply of lubricant, as shown in FIG.

In a further advantageous embodiment, a special connection block for the lubricant supply is provided, in which a connection opening 43 1 is provided for a supply channel system 32, closable by a shut-off valve 44. The supply channel system can analogously to the assembly blocks discussed above with the supply channel system of other assembly blocks connected become. Such an advantageous connection block accordingly offers particular advantages not only for metering devices with metering pumps according to the invention, but also for metering devices with cuboid metering pumps according to FIG. 2. In both cases, such a connection block according to the invention makes it possible to replace metering pumps without the lubricant container having to be removed by the supply with the shut-off valve 44 is disconnected.

The contents of all documents cited in this application by reference form an integral part of the disclosure. The specific embodiments disclosed are not capable of limiting the scope of the present invention. Various modifications and modifications will become apparent to those skilled in the art from the foregoing description and the drawings, in addition to the disclosed examples which are also intended to be within the scope of the claims. LIST OF REFERENCE NUMBERS

I, 1a, 1b, 1c metering pump

10, 10a pump block

101 longitudinal axis

102, 102 'side wall

103 recess for sealing element

104 sealing element, sealing ring

II, 11a first supply channel system for liquid

III, 111 'opening

12 dosing chamber, dosing cylinder

13, 13 'pumping channel

131 check valve

132 return spring of the check valve

14 dosing piston

141 front end of the piston

142 axis of the metering piston

15 housing jacket, housing

16 actuator device

161 Reset element, return spring

162 cylinder of the pneumatic actuator device

163 pistons of the pneumatic actuator device

164 Setting thread for dosing piston position

165 rotary knob, manual operation

17 second supply duct system for compressed air

171, 171 'opening

21 liquid, lubricant

22 compressed air, pneumatic medium

30, 30a, 30b mounting block

301, 301 'sidewall

302 upper wall

303 lower wall

304 blind hole with internal thread

31, 31a recording

311 wall of the receptacle

312 insertion opening

313 second opening

314 stop

32, 32a third supply channel system for liquid 321, 321 'opening

33 first circumferential groove for liquid

331, 331 'sealing element, sealing ring

332, 332 'recess for sealing element

34 fixative

341 screw

342 groove

343 threaded hole , 35 ', 35a fourth supply duct system for compressed air1, 35 1' opening

second circumferential groove for compressed air1, 361 'sealing element, sealing ring2, 362' recess for sealing element

Lubricant metering

connecting means

0 clamping bolt

1 mother

2 clip, clip

3 clamping plates

4 final block

5 terminal block

6 recess for clip, clamp

8 blind hole with internal thread

9 hole

pumps stack

1 axis of the pump stack

reservoir

1 mounting opening for connection element2 connection element

shut-off valve

1 mounting opening for shut-off valve

Feed line for the lubricant1 Connecting piece feed line

2 mother

supply line

third circumferential groove

1, 51 1 ^' sealing element, sealing ring 2, 51 2' recess for sealing element

fourth circulating ut

1, 52 1 'sealing element, sealing ring 2, 522' recess for sealing element

vent channel

Claims

claims

A metering pump (1) for metering liquids (21), comprising at least one pump block (10, 10a) comprising a first supply channel system (11) for the liquid to be conveyed; a pumping channel (13); and a pumping device (12, 14, 16) for pumping the liquid from the supply channel system into the pumping channel, characterized in that the pump block has a housing shell (15) in the shape of a cylinder or a truncated cone, the supply channel system (11) entering at least one of In the housing shell arranged opening (111, 111 ') opens.

2. Metering pump according to claim 1, characterized in that the pumping device connected to the first supply channel system (11) metering chamber (12), in the metering chamber along an axis (142) slidably disposed metering piston (14) and an actuator device (16) Moving the Dosierkolbens along said axis, wherein the metering piston is adapted to, when displaced in a direction along said axis (142) a certain amount of liquid present in the metering chamber (21) through a check valve (131) in the pumping channel (13) to pump.

3. dosing pump according to claim 1 or 2, characterized by a by a pneumatic medium (22), in particular compressed air, operable pneumatic actuator device (16), and a second supply channel system (17) for the pneumatic medium (22) for operating the pneumatic actuator device ( 16), said second supply channel system opening into at least one in the housing shell (15) arranged opening (171, 171 ') opens.

4. Metering pump according to one of claims 1 to 3, characterized by a mounting block (30) with at least one receptacle (31), which is adapted to the shape of the housing shell (15) of the pump block (10), and in which the pump block is flush arranged ,

Dosing pump according to claim 4, characterized by a recess, in particular a circumferential groove (342) on the housing shell (15) of the pump block, and a in a continuous threaded bore (343) arranged in the mounting block screw (341), wherein the groove, the threaded bore , And the screw are configured and arranged such that in a mounted pump block, the screw with the groove reversibly engageable and so the pump block in the mounting block in the direction of the longitudinal axis (101) is reversibly positively fixed.

Dosing pump according to claim 5, characterized in that the mounting block (30) has a third supply channel system (32) for the liquid (21);

and that on the wall (311) of the receptacle (31) a first circumferential groove (33) is provided, which is connected to the third supply channel system (32), and which is arranged such that the at least one opening (111, 111 ' ) of the first supply channel system (11) of a pump block (10) arranged in the mounting block overlaps with the first circumferential groove (33); or

in that the third supply channel system opens into at least one opening (321, 321 ') arranged in the wall (311) of the receptacle (31), and a first circumferential groove (33) is provided on the housing jacket (15) of a pump block (10) arranged in the assembly block. is provided, which is connected to the first supply channel system (11) and which is arranged such that the at least one opening (321, 321 ') of the third supply channel system (32) with the first circumferential groove (33) overlaps;

such that the first (11) and third (32) feed channel systems form a continuous liquid feed channel (11, 33, 32) system (21).

Dosing pump according to claim 6, characterized in that the mounting block (30) has a fourth supply channel system (35) for pneumatic medium (22);

and that on the wall (311) of the receptacle (31) a second circumferential groove (36) is provided, which is connected to the fourth supply channel system (35), and the like arranged that the at least one opening (171, 171 ') of the second supply channel system (17) of a pump block (10) arranged in the assembly block overlaps with the second circumferential groove (36); or

the fourth supply channel system opens into at least one opening (351, 351 ') arranged in the wall (311) of the receptacle (31), and a second circumferential groove (36) is provided on the housing jacket (15) of a pump block (10) arranged in the assembly block. is provided, which is connected to the second supply channel system (17) and which is arranged such that the at least one opening (351, 351 ') of the fourth supply channel system (35) overlaps with the second circumferential groove (36);

such that the second (17) and fourth (36) feed channel systems form a continuous pneumatic medium feed channel (17, 36, 35) system (21).

8. Metering pump according to claim 6 or 7, characterized by sealing elements (331, 331 ', 361, 361') in the receptacle (31) of the mounting block (30) and / or to the housing shell (15) of the pump block (10). is arranged along the circumference and which are adapted to the at least one opening (111, 111 ', 321, 321') of the first supply channel system (11) and the third supply channel system (32) and the first circumferential groove (33) sealingly closed connect, and / or the at least one opening (171, 171 ', 351, 351') of the second supply channel system (17) and the fourth supply channel system (35) and the second circumferential groove (36) sealingly connect.

9. dosing pump according to one of claims 4 to 8, characterized in that the mounting block (30) has two parallel, planar walls (302, 303), and the third supply channel system (32) and / or the fourth supply channel system (35) on both Walls opens into an opening, wherein the respective two openings are arranged such that an opening coincides with a corresponding opening of a further, same metering pump (1a, 1b) when the two metering pumps are placed with the walls on top of each other. Metering device (4) for metering liquids (21), with at least one metering pump (1) according to one of claims 1 to 9.

Dosing device according to claim 10, characterized by two or more metering pumps (1, 1a, 1b) according to one of claims 1 to 9, wherein they have a mounting block (30) with a receptacle (31) corresponding to the shape of the housing shell (15) of a Pump block (10) of the metering pump (1, 1a, 1b) is adapted, and in which the pump block is arranged.

Dosing device according to claim 11, characterized in that the two or more metering pumps (1, 1a, 1b) are arranged in a stack (42), wherein each two parallel, planar walls (302, 303) of the mounting blocks (30, 30a, 30b ) of two adjacent metering pumps are flush with each other.

Dosing device according to claim 12, characterized by a reservoir (43) for the liquid (21), a common supply channel system (11, 32) of the metering pumps (1, 1a, 1b) for the liquid (21), and a shut-off valve (44) for Reversible separation of the supply channel system from the reservoir.

Dosing device according to one of claims 10 to 13, characterized by means (41, 412) for releasably connecting the mounting blocks (30, 30a, 30b) of two adjacent dosing pumps (1, 1a, 1b), for example clips or clamps (412), with the assembly blocks to be connected (30, 30 a, 30 b) are operatively connected.

Dosing device according to claim 14, characterized in that the clips or staples (412) are designed such that when creating the effective connection of the clips or staples (412) with the assembly blocks to be connected (30, 30a, 30b) the mounting blocks are braced against each other ,