| Protection device for intake pipes of lubricating coolant pumps -> Monitor Keywords |
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Protection device for intake pipes of lubricating coolant pumpsRelated Patent Categories: Pumps, MiscellaneousProtection device for intake pipes of lubricating coolant pumps description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060182642, Protection device for intake pipes of lubricating coolant pumps. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present application relates, according to claim 1, to a protective pot which is adapted to be fastened to the mouth of an intake pipe of a lubricating coolant pump for machine tools. [0002] Such a protective pot is known from DE 1 240 718 C (see suction basket 3 in FIG. 1), but is not described in detail. [0003] From DE 90 00 713 U1, further, a protection device against intake of dirt particles has become known, which is adapted to be mounted to the mouth of an intake pipe of a lubricating coolant pump for machine tools, wherein a liquid collector pot is shaped to provide a distance between the intake openings and the bottom of the reservoir, so that deposits on the bottom are prevented from being sucked in. [0004] The construction according to the present claim 1 differs from this in that the pot-shaped protection device has a closed peripheral wall and at least one suction window in a distance above the bottom. [0005] A protective pot for the mouth of an intake pipe with a partly closed peripheral wall has become known from DE 28 47 607 A1. However, there, the intake openings are arranged directly at the bottom, which involves the risk that deposits are sucked in. A prior art that would be closer to the invention has not been found, and since the cited prior art does not suggest the construction as indicated in claim 1, the grant of a patent can be promised. [0006] The further claims 2 to 8 are also allowable, an amendment being necessary only in claim 8, as shown in the Annex. [0007] In the introductory part of the description, the prior art according to the citations will have to be discussed. A reference to DE 198 05 411 C2 is not necessary, because this document does not disclose a protection device according to claimed species. [0008] Clean copies of the amended sheets will have to be filed. With the present documents, the grant of a patent is not yet possible. BACKGROUND OF THE INVENTION [0009] The invention relates to lubricating coolant pumps for machine tools, comprising an intake pipe that is immersed in a lubricating coolant reservoir. [0010] In machine tools, the tools and the workpieces are cooled and lubricated during the machining processes by means of a lubricating coolant emulsion or an oil. The emulsion dripping off from the tool and the workpiece is collected, filtered and stored in a lubricating coolant reservoir that is typically arranged in the machine bed and from which the emulsion is sucked by means of the lubricating coolant pump and is conveyed again to the working area of the machine, so that a closed lubricating coolant circuit is formed. [0011] Since the lubricating coolant emulsion frequently contains abrasive contaminants such as metal chips and the like, lubricating coolant pumps are in many cases configured as centrifugal pumps. [0012] DE 198 05 411 C2 discloses a lubricating coolant pump for machine tools, comprising a conveyor screw that is arranged in the intake pipe. Because of the very low mechanical strain on the pumped liquid, this pump is particularly suited for modern lubricating coolant emulsions which have a strong foaming tendency. [0013] In view of an increased technical use of silicon carbide, one is increasingly confronted with the problem to pump lubricating coolant emulsions that are contaminated with particles of silicon carbide. However, because of its high hardness, silicon carbide leads to an increased wear of the lubricating coolant pumps. SUMMARY OF THE INVENTION [0014] It is therefore an object of the invention to provide a device that permits to establish, e.g., by means of a screw pump, a lubricating coolant circuit that is less sensitive to silicon carbide particles contained in the lubricating coolant emulsion. [0015] According to the invention, this object is achieved by a protective pot that is adapted to be mounted to the mouth of an intake pipe of a lubricating coolant pump for machine tools. The protective pot has a closed bottom, a closed peripheral wall and at least one suction window arranged in a distance above the bottom. The suction window is for example formed in the peripheral wall. [0016] The invention further provides an intake pipe for a lubricating coolant pump for machine tools, having such a protective pot mounted to one end of the intake pipe. [0017] In particular, the invention provides an intake pipe for a lubricating coolant pump for machine tools, having such a protective pot, which is arranged at a lower end of the intake pipe, wherein an opening of the intake pipe is arranged inside of the protective pot. Preferably, the opening of the intake pipe is arranged below the at least one window. [0018] Another subject of the invention is a lubricating coolant pump for machine tools, having such an intake pipe with protective pot. For example, the intake pipe is immersed with its protective pot in a lubricating coolant reservoir. [0019] The protective pot according to the invention prevents that the opening of the intake pipe arranged in the protective pot is positioned directly above the bottom of the lubricating coolant reservoir. The bottom of the protective pot is arranged between the opening of the intake pipe and the bottom of the lubricating coolant reservoir. The upwardly projecting closed wall of the protective pot assures that chips, silicon carbide particles or other contaminants that accumulate on the bottom of the lubricating coolant reservoir will not or to a strongly reduced extent enter into the interior of the protective pot and hence into the intake pipe. This helps to significantly reduce the wear of the lubricating coolant pump. [0020] In a conventional device having an intake pipe or an intake neck of a lubricating coolant pump, it is necessary for minimizing the intake of chips and other contaminants, to arrange the opening of the intake pipe or intake neck in a certain distance, e.g. several centimeters, above the bottom of the lubricating coolant reservoir. The deeper the intake pipe or the intake neck is immersed into the lubricating coolant reservoir, the more likely will chips or other contaminants be sucked in. On the other hand, the larger the distance between the intake opening and the bottom of the lubricating coolant reservoir, the larger is the amount of lubricating coolant emulsion that is necessary for assuring a sufficient fill level of the lubricating coolant reservoir. Thus, it is a complex task to mount the lubricating coolant pump. Moreover, a too little height of the intake pipe above the bottom of the lubricating coolant reservoir will be revealed only by an increased wear of the pump. Then, however, the damage has occurred already. [0021] These drawbacks are efficiently avoided by the solution according to the invention. [0022] Useful embodiments of the invention are indicated in the dependent claims. Continue reading about Protection device for intake pipes of lubricating coolant pumps... Full patent description for Protection device for intake pipes of lubricating coolant pumps Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Protection device for intake pipes of lubricating coolant pumps patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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