JP6933602B2 - Vacuum pump with lubricant water level limiting device - Google Patents

Description

The present invention relates to a vacuum pump having a chamber. Within the chamber are at least one component of the vacuum pump that should be lubricated by oil bath lubrication.

A vacuum pump has multiple moving components. These need to be lubricated during the operation of the vacuum pump. This is especially true for vacuum pumps used in the pre-vacuum region of vacuum equipment. Vacuum pumps for the pre-vacuum region include, for example, one-stage or multi-stage roller piston pumps (these are also called roots pumps or multistage roots pumps), screw pumps, claw pumps (German: Klauen pump), scrolls. A pump or a rotary vane pump. The components to be lubricated in the vacuum pump are usually located in the chamber. A lubricant (eg, oil) is present in the chamber.

In such a chamber, oil bath lubrication is used to lubricate the components of the vacuum pump. In oil bath lubrication, a portion of the component is submerged in the lubricant so that the surface of the component to be lubricated is moistened by the lubricant, for example during its rotation. In doing so, it is essential that the correct water level (oil level) of the lubricant be adjusted in the chamber and maintained during the operation of the vacuum pump. At water levels where the lubricant is too low, the moving components will not be adequately lubricated. On the other hand, if the lubricant is excessive, the water level will be too high, for example, it will be difficult to rotate the components, and thus the operation of the vacuum pump will be adversely affected. Therefore, the life of the entire vacuum pump may be shortened or even a complete failure may occur due to the incorrect adjustment of the lubricant water level in the chamber.

Numerous devices are known for monitoring the water level of lubricants in chambers. For example, a piezo-electrically driven vibration limiting switch is used. But this is extremely effective. One of the simplest devices is a surveillance window. It is also located in the lateral wall of the lubricant-filled chamber, in which the exact water level of the lubricant can be monitored, for example based on appropriate markings. be.

However, a situation may occur in which the lubricant water level display is not accurate in the monitoring window. For example, in a roller piston pump, it is not always necessary to be horizontally arranged because this is an operation. This means that the axis of rotation of the shaft of the roller piston pump does not necessarily extend parallel to the bottom or perpendicular to gravity. A predetermined tilt of the roller piston pump with respect to the horizontal is acceptable without impairing its operation.

However, in such a tilted assembly position, the surface of the lubricant does not extend parallel to the bottom of the chamber, in which the lubricant is present, based on gravity. If the monitoring window and the component to be lubricated are spaced apart from each other, the actual water level of the lubricant in the area of the component will differ from the water level shown in the monitoring window based on the tilt of the vacuum pump or chamber. .. The greater the distance between the component and the monitoring window, the greater the difference between the actual water level and the displayed water level.

Thus, in the monitoring window of the chamber, the desired water level or filling state of the lubricant is displayed, but when the vacuum pump is so inclined, the area of the component to be lubricated is high. There is a water level that is too low or too low. As a result, when the vacuum pump is placed in a slightly tilted position, it is detected that too little lubrication or too much component subduction into the lubricant occurs, based on the indications in the monitoring window. I can't.

U.S. Patent Application Publication No. 200880614A1 U.S. Patent Application Publication No. 3785169A

An object of the present invention is to complete a vacuum pump having an inexpensive device for which the lubricant water level can be precisely adjusted and maintained for the components to be lubricated of the vacuum pump.

This problem is solved by a vacuum pump having the characteristics according to claim 1, and in particular, the vacuum pump is arranged in a chamber, in which at least one component of the vacuum pump to be lubricated by oil bath lubrication. ) Is solved by having a lubricant water level limiting device to limit the water level of the lubricant in. The lubricant water level limiting device has an overflow pipe and a lubricant plug according to the invention. The overflow pipe has a lower opening and an upper opening protruding into the chamber and is located within the opening at the bottom of the chamber. At that time, the bottom of the chamber is located below at the built-in position of the vacuum pump.

The lower opening of the overflow pipe is closed by a lubricant plug. In addition, the upper opening of the overflow pipe is open, and one of the upper openings defines the lubricant water level in the chamber. According to the invention, the upper opening is located adjacent to the component to be lubricated. This is because, for example, the distance between the upper opening of the overflow pipe and the component to be lubricated is the typical dimension of the component and the overflow pipe (eg, the diameter or circumference of the component, the length of the overflow pipe, etc.). It means that it is smaller than the one.

The lubricant water level limiting device accurately defines and maintains the lubricant water level where the component to be lubricated is located, based on the placement adjacent to the component to be lubricated. The lubricant water level is accurately determined by the lubricant water level limiting device even when the vacuum pump is exposed to a predetermined slope.

Advantageous embodiments of the present invention are described in the subordinate claims, specification, and drawings.

According to the embodiment, the overhang of the contour of the overflow pipe onto at least one plane extending perpendicular to the bottom and the overhang of the contour of at least one component are in contact with or overlap. In other words, the contour of the overflow pipe and the contour of at least one component meet or intersect at least when looking sideways at the chamber, that is, at at least one line-of-sight angle. Based on the overlap of contour protrusions, the upper opening of the overflow pipe ensures that the lubricant water level is actually determined in the area of the component and not away from it, and the lubricant water level is sufficient. Having a height ensures that a defined subduction of the component into the lubricant takes place.

Preferably, the distance between the upper opening of the overflow pipe and the bottom of the chamber is greater than the distance between the lower edge of at least one component and the bottom of the chamber. Thus, the lower edge of at least one component is located below the upper opening of the overflow pipe and thus the sinking required for oil bath lubrication into the lubricant of at least one component. It is guaranteed that the inclusion will occur. The depth can be further defined by determining the spacing between the upper opening of the overflow pipe and the bottom of the chamber. To this depth, at least one component is submerged in the lubricant.

Preferably, the central axis of the overflow pipe intersects at least one component. Since the overflow pipe is located below the component for oil bath lubrication, especially with the extrapolation or extension of the overflow pipe, its central axis intersects the component. This creates at most a slight lateral offset between the overflow pipe and at least one component, and the upper opening of the overflow pipe actually places the lubricant water level and at least one component. It is guaranteed to be defined in the area.

According to the preferred embodiment, the overflow pipe is basically formed straight and, in particular, oriented at right angles to the bottom of the chamber. The formation and orientation of such an overflow pipe makes it possible to manufacture it inexpensively by a simple method. Further, when the overflow pipe is oriented perpendicular to the bottom of the chamber, the distance between the upper openings of the overflow pipe corresponds to the lubricant water level in the chamber. Therefore, this is easily determined.

The overflow pipe preferably has an upper portion. This portion is located within the chamber and has an upper opening. In doing so, the upper portion has a length greater than the distance between the lower edge of at least one component and the bottom of the chamber. Thus, since the upper opening of the overflow pipe is located above the lower edge of at least one component, again, at least one component can sink into the lubricant at least slightly. Guaranteed. Further, the length of the upper portion of the overflow pipe can appropriately determine the lubricant water level in the chamber.

Preferably, the overflow pipe has threads along the central portion. This thread is provided to engage the thread at the bottom of the chamber. This allows the lubricant water level limiting device to be easily and inexpensively attached to the bottom of the chamber. The threads in the central portion of the overflow pipe and the threads in the bottom of the chamber further determine the location of the overflow pipe, in particular the location of the upper opening and thus the lubricant water level within the chamber.

According to another embodiment, the position of the overflow pipe, in particular the position of the upper opening of the overflow pipe in the chamber, is calibrated. This allows the lubricant water level limiting device to be used with various components of the vacuum pump, which require different sink depths into the lubricant. In addition, calibrationability can compensate for manufacturing tolerances.

The overflow pipe preferably has a lower portion located outside the chamber. This part has a stopper. Further spacer elements may be placed between the stopper and the chamber housing. This allows the position of the overflow pipe to be adjusted. The stopper and spacer elements therefore determine how much the overflow pipe protrudes into the chamber.

The opening at the bottom of the chamber, where the overflow pipe is located, is preferably located at the lowest point of the bottom. Therefore, the opening at the bottom of the chamber is used not only for mounting the lubricant water level limiting device, but also as an outlet opening for the chamber.

Preferably, the lubricant plug is formed by a threaded element. This element can be engaged with a thread in the lower opening of the overflow pipe. The engagement between the threads of the lubricant plug and the lower opening of the overflow pipe provides a simple and reliable installation of the lubricant plug to seal the chamber.

Preferably, within the chamber are two components to be lubricated by oil bath lubrication (vacuum pump components), and the overflow pipe is at least partially located between the two components. This arrangement of overflow pipes between the two components determines one exact lubricant water level for both components. This is because the upper opening of the overflow pipe lies between the two components.

Preferably the chamber has an additional inlet opening in addition to the bottom opening used as the outlet opening. Its longitudinal axis is not aligned with the corresponding longitudinal axis of the outlet opening. In other words, the inlet and outlet openings do not preferably directly overlap when viewed from the bottom of the chamber. Alternatively, one or more obstacles, or turning means, can be located between the inlet and outlet openings. In both alternatives, the lubricant is prevented from appearing in the upper opening of the overflow pipe as it fills the chamber. Regardless of the orientation of the chamber, and in both alternatives, preferably at least parallel to the direction of gravity, directly between the inlet and outlet openings, or the upper opening of the overflow pipe. There are no optical or visual obstacles.

When filling the chamber with lubricant, the diversion or obstruction of the lubricant flow is an additional diversion provided for this purpose, eg, by one or more components to be lubricated, or by one or more. It can be achieved by an element (eg, an inset guide plate or a covering device attached to an overflow pipe). Such a cover device can be formed, for example, by one or more cover elements. They can be offset with respect to the longitudinal axis of the overflow pipe, which at least partially covers the upper opening of the overflow pipe and is attached to the overflow pipe by each fixing element. There is. In addition, the front of the upper end of the overflow pipe can be closed shape-bonded or material-bonded, and the sides of the overflow pipe are at the desired lubricant water level. It is possible to have one or more openings.

Overflow pipes can have protrusions on the edges of such openings. These first guide the lubricant passing by the side of each opening when filling the chamber. Optionally, a plurality of such lateral openings and protrusions can be arranged at different desired lubricant water level heights within the overflow pipe. As a result, the openings located below each desired lubricant water level are blocked by the plug means. Therefore, it is possible to flexibly adjust the lubricant water level. At that time, the plug means does not necessarily have to be completely hermetically sealed. This is because the amount of leak that may occur during lubrication filling is drained through the overflow pipe, and there is no need for perfect sealing of the plug means during later operation.

Alternatively or additionally, a filling aid / device for filling the lubricant is provided to prevent the lubricant from directly hitting the upper opening of the overflow pipe when filling the chamber. It is placed inside the inlet opening. It has an outlet in the chamber that is eccentrically arranged with respect to the inlet opening. The filling aid / device is, for example, a filling pipe similar to an overflow pipe. The fill tube is bent or rolled in the chamber and extends towards the inlet opening, which diverts the lubricant to be filled laterally into the chamber. In special cases, a filling funnel can be provided as an auxiliary element. Its anterior spout area has a filling tube end that is bent or angled by an angle less than 90 degrees, so a funnel can be centrally inserted into the inlet opening to ensure eccentric filling. Is possible.

Further, another opening in the chamber can be formed as an outlet opening for accommodating the overflow pipe. For example, it can be formed on multiple lateral walls of the chamber, or on one upper wall. This allows different spatial orientations of the vacuum pump. For example, the inlet opening can be formed so that it can be used as an outlet opening and for accommodating overflow pipes even in the opposite orientation of the vacuum pump. .. This makes the previous outlet opening correspondingly an inlet opening.

In addition, another pair of openings can be placed on each facing wall of the chamber. These can be formed as both an inlet opening and an outlet opening, respectively. This allows reversible orientation of the chamber, or vacuum pump, with respect to multiple planes. Lubricating water level limiting devices can therefore advantageously be used in various parts of the chamber. In doing so, it is possible that different lengths of overflow pipes are intended.

According to another embodiment, one or more permanent magnets are fixed to the overflow pipe. These permanent magnets have a particularly ring shape. At that time, the permanent magnet can be covered with an overflow pipe, sandwiched between the overflow pipes, adhered to the overflow pipe, or screwed. Permanent magnets allow ferromagnetic outer bodies in the lubricant, such as debris and wear particles, to be collected and separated from the lubricant circuit of the vacuum pump. Alternatively, a portion of the overflow pipe, such as the upper portion, or the entire overflow pipe itself, can also be at least partially made of magnetic material. At that time, all magnetizable materials and permanent magnet materials, such as iron and rare earth magnets (such as Samalium cobalt and neodymium iron boron), and plastic bonded magnets having magnet particles and plastic magnets (such as Samalium cobalt and neodymium iron boron) are used as materials. German: kunststoffgebundene Magnet) can be used.

Preferably, the outer contour of the overflow pipe has suitable dimensions, including fixed permanent magnets or integrated permanent magnets, so that the overflow pipe can be inserted into the outlet opening. Preferably, these dimensions remain attached to the permanent magnet, or the outer body attached to the overflow pipe, when the overflow pipe is later removed, and are not scraped off by the edges or walls of the outlet opening. Is decided.

Preferably, the chamber, or at least the bottom of the chamber, is made from a non-magnetic material in the area around the opening that houses the overflow pipe. To allow the overflow pipe to be better inserted and removed from the outlet opening with one or more permanent magnets, and to ensure the collection of ferromagnetic outer bodies in the overflow pipe, the bottom of the chamber. This is to prevent people from gathering at.

The present invention further relates to a method for filling the chamber of a vacuum pump with a lubricant. This vacuum pump has the above-mentioned characteristics. At least one component (vacuum pump component) to be lubricated by oil bath lubrication is arranged in the chamber.

According to this method, the lubricant water level limiting device (having overflow pipes with upper and lower openings) has an opening at the bottom of the chamber such that the upper opening is located adjacent to the component to be lubricated. It is attached to the part. Subsequently, the chamber is filled with lubricant. Filling is performed until lubrication enters the upper opening. A lubricant plug is then installed in the lower opening of the overflow pipe. This is to close the overflow pipe and chamber.

By this method, the lubricant water level in the chamber is determined at the desired position. This is specifically adjacent to the component to be lubricated. Thus, the chamber is filled with lubricant by this method to the desired or required water level in the area of the component to be lubricated, even in the proper placement of the vacuum pump. At that time, there is no need for additional management, such as a monitoring window.

The present invention will be illustrated below, with reference to the accompanying drawings, based on possible formations of the present invention.

Side view of vacuum pump chamber according to prior art Side view of vacuum pump chamber according to prior art Side view of vacuum pump chamber according to prior art Partial fraction decomposition of a part of the vacuum pump according to the invention Side view of the vacuum pump part in Fig. 2, assembled Principle diagram of the part shown in FIG. 2 of the vacuum pump according to the invention, assembled state. Another cross-sectional view along line 5-5 shown in FIG. Side view of FIG. 5, one of three different built-in postures of the vacuum pump Side view of FIG. 5, one of three different built-in postures of the vacuum pump Side view of FIG. 5, one of three different built-in postures of the vacuum pump

1a, 1b, and 1c show a part of a vacuum pump. This vacuum pump is formed as a roller piston pump in this example. The vacuum pump follows the prior art and is represented by three different built-in postures. In FIG. 1a, the roller piston pumps are arranged horizontally. That is, the axis of rotation of that axis is horizontal to the bottom. In FIG. 1b, the roller piston pump is tilted 3 degrees to the left. On the other hand, it is tilted 3 degrees to the right in FIG. 1c.

The represented portion of the roller piston pump has a housing 12 having a chamber 11. In this, the components to be lubricated of the roller piston pump are arranged. These components are gears 13 in this example. This gear is attached to the shaft 15 of the roller piston pump. Lubrication of the gear 13 is required during the operation of the roller piston pump. This is because it engages with another gear (= a gear located behind the gear 13 in FIGS. 1a to 1c and thus not shown in the figure).

The chamber 11 is a component of the all-roller piston pump. The continuation of the shaft 15 and housing 12 extending to the right is not shown in the figure. Within this not shown portion of the roller piston pump are shaft bearings, shaft seals, and components that provide the pumping effect of the roller piston pump. At that time, the bearing element in direct contact with the chamber 11 can be lubricated by the lubricant circuit of the roller piston pump. According to the formation of the roller piston pump, the second chamber 11 can be present at the other end of the roller piston pump. This is to lubricate another bearing and / or gear unit. It is typically similar to, or even substantially identical to, the chamber represented, and can be configured to be mirror-inverted. However, in some cases, it has an additional opening in chamber 11. This is to connect at least one drive motor to at least one of the shafts 15.

During the operation of the roller piston pump, the gear 13 is lubricated by oil bath lubrication. In oil bath lubrication, the splash disc 17 connected to the gear 13 is immersed in a lubricant, for example, oil. The chamber 11 is filled with this oil up to the lubricant water level 19.

The lubricant fills the chamber 11 through the inlet opening 21. The outlet opening 23 (located at the bottom 25 of the chamber 11) allows the lubricant to be drained out of the chamber 11 again. The inlet opening 21 and the outlet opening 23 are closed by plugs 24 and 25 (eg, oil plug screws) during operation of the vacuum pump. The stoppers 24 and 25 can have the same structure or different structures.

The chamber 11 has a monitoring window 27 to fill the chamber 11 with the lubricant to the lubricant water level 19 and to monitor the lubricant water level 19 during the operation of the vacuum pump. This monitoring window is arranged on the side wall portion of the chamber 11. As shown in FIG. 1, when the roller piston pump is horizontally present, the filling of the chamber 11 with the lubricant up to the marking portion in the monitoring window 27 corresponds to the lubricant water level 19. Ideal lubrication of the gear 13 is performed at this lubricant water level. This means that only the splash disc 17 is immersed in the lubricant and the underside of the gear 13 is not. The gear 13 only touches the surface of the lubricant and is primarily moistened by the lubricant. The lubricant is ejected from the lubricant sump by the splash disc 17 and reaches the gear 13.

In FIGS. 1b and 1c, the chamber 11 is certainly similarly filled with lubricant up to the central marking portion of the monitoring window 27. Based on the tilt of the roller piston pump, the lubricant water level 19 remains below the gear 13 in the region of the gear 13 of FIG. 1b, while the gear 13 of FIG. 1c is of the roller piston pump in the opposite direction. Since the gear 13 sinks into the lubricant due to the inclination, the lower side of the gear 13 exists below the lubricant transition 19.

During the operation of the roller piston pump, the lubrication of the gear 13 is insufficient at the inclination of the roller piston pump and the chamber 11 shown in FIG. 1b. This is because roller piston pumps are usually operated for a very long period of time. In the tilt of the roller piston pump and chamber 11 shown in FIG. 1c, on the contrary, the gear 13 is excessively subducted in the lubricant, so that the shaft 15 is added due to this excessive subduction. It works under a typical load. This can cause other components of the roller piston pump (such as its motor) to be unnecessarily added. In both cases shown in FIGS. 1b and 1c, the life of the roller piston pump can be shortened due to the inaccurate lubricant transition 9.

In FIG. 2, a part of the vacuum pump according to the invention, particularly a roller piston pump, is shown. The idea of the invention is basically applicable to any other device with oil bath lubrication, or pump / vacuum pump. It also has a chamber 11 here. Two components to be lubricated (again, two gears 13) are arranged therein. The second gear 13 is hidden by the splash disc 17 in the one shown in FIG.

The line-of-sight direction of FIG. 2 is opposite to the line-of-sight direction of FIGS. 3 and 4, and is directed from the virtual center of the roller piston pump toward the inside of the chamber 11.

In the outlet opening 23, in the roller piston pump according to the invention, a lubricant water level / limiting device 31 is provided instead of the simple stopper 24. The lubricant transition / limiting device 31 is shown as an exploded view in FIG. 2 and in an assembled state in FIGS. 3 to 5. The lubricant water level / limiting device 31 has an overflow pipe 33. The overflow pipe has an upper portion 35, a central portion 37 and a lower portion 39. These are arranged coaxially with the central axis 40 of the overflow pipe 33. The overflow pipe 33 is hollow on the inside and has an upper opening 41 within the upper portion 35 and a lower opening 43 within the lower portion 39. Further, the lubricant water level limiting device 31 has a lubricant plug 45. The lubricant plug can be, for example, a plug screw, as is commonly used to plug the outlet opening 23.

The central portion 37 of the overflow pipe 33 and the upper portion of the lubricant plug each have one thread 47. It is rotated and engaged with the corresponding threads in the bottom 25 of the chamber 11, that is, in the outlet opening 23 or in the lower portion 39 of the overflow pipe 33, respectively. This is to fix the overflow pipe 33 in the housing 12 of the chamber 11 and to fix the lubricant plug 45 in the lower portion 39.

One seal 49 is provided between the overflow pipe 33 and the bottom 25 of the chamber 11 and between the lubricant plug 45 and the lower portion 39 of the overflow pipe 33. This is, for example, an O-ring. As a result, the outlet opening 23 of the chamber 11 is surely plugged after the assembly of the lubricant water level limiting device 31.

In the area of the lower portion 39, the overflow pipe 33 has the largest diameter, or cross section. This is larger than the diameter or cross section of the central portion having the threads 47 and the upper portion 35 of the overflow pipe 33. Further, the lower portion 39 of the overflow pipe 33 has a hexagonal shape. This is to simplify the fixing of the overflow pipe 33 in the outlet opening 23. Alternatively, the lower portion 39 of the overflow pipe 33 has a quadrangular or other complex or rounded shape for the same purpose, with a structured surface or individual depressions / ridges. It is possible to have what you have.

The lower portion 39 of the overflow pipe 33 is arranged outside the chamber 11 as shown in FIGS. 3 to 5 even when incorporated in the lubricant water level limiting device 31. Based on a larger diameter or cross section than the upper and lower portions 35,37 of the overflow pipe 33, the upper portion 39 of the overflow pipe 33 forms a stopper on its upper side surface. This stopper determines the distance. Up to this distance, the upper portion 35 of the overflow pipe 33 protrudes with the lubricant water level limiting device 31 incorporated in the chamber 11.

An optional spacer element (eg, one or more ring discs) (eg, one or more ring discs), not shown, can be placed between the upper side surface of the upper portion 39 of the overflow pipe 33, or between the stopper and the chamber 11. Is. Thereby, the position of the overflow pipe, and in particular the position of the upper opening 41 of the overflow pipe 33 in the chamber 11, is adjustable (einstelbar) and thus calibrateable (German: justierbar). This allows the lubricant water level limiting device 31 to be used in chambers 11 of different embodiments and for various lubricated components of roller piston pumps or vacuum pumps.

Chamber 11 further has a subsided portion 51 in the region of the bottom 25. An outlet opening 23 is arranged therein (see FIG. 2). As a result, the outlet opening 23 (in which the overflow pipe 33 and the lubricant water level limiting device 31 are arranged) is located at the lowest point of the bottom 25.

FIG. 3 shows a front view of the chamber 11 having the attached lubricant water level limiting device 31. At that time, the housing 12 of the chamber 11 is closed. Therefore, the internal contours of both gears 13, the shaft 15, the splash disc 17, and the chamber 11 are represented by broken lines. Only a very small cutout inside the chamber 11 is visible through the monitoring window 27. When the roller piston pump according to the invention is in the horizontal direction, it can be seen that the opening 41 on the upper side of the overflow pipe 33 and the center of the monitoring window 27 are located at the same height as the bottom 25 of the chamber 11.

FIG. 4 shows a principle diagram of a portion of the roller piston pump in the incorporated state shown in FIG. Unlike FIG. 3, only the external contour of the housing 12, the two shafts 15 each having gears 13, and the splash disc 17 and the lubricant limiting device 31 are shown. The opening on the upper side of the overflow pipe 33 of the lubricant limiting device 31 is arranged adjacent to both gears 13 and exists between the two gears.

FIG. 5 shows another chamber 11. This chamber extends along a line referred to in FIG. 3 as 5-5. In FIG. 5, it can be seen that the upper portion 35 of the overflow pipe 33 projects into the chamber 11 up to the lower corner of the gear 13. In the representation of FIG. 5, therefore, the protrusion of the contour of the overflow pipe 33 and the protrusion of the contour of the gear 13 come into contact with each other. Further, the distance between the upper opening 35 of the overflow pipe 33 and the bottom 25 of the chamber 11 is greater than the distance between the lower edge of the splash disk 17 and the bottom 25 of the chamber 11. Moreover, the central axis 40 of the overflow pipe 33 intersects the contour of the gear 13 when extended. That is, in the representation of FIG. 5, there is at most a small lateral offset between the lubricant water level limiting device 31 and the gear 13. In other words, the overflow pipe 33 is arranged directly under the gear 13 in FIG.

Lubricant is inserted into the chamber 11 through the inlet opening 21 for lubrication of both gears 13 during operation of the roller piston pump. At that time, the lubricant water level limiting device 31 is opened in the region of the lower portion 39 of the overflow pipe 33, that is, the lubricant plug 45 is first placed in the lower opening 43 of the overflow pipe 33. Not placed. The chamber 11 is filled with the lubricant until it enters the upper opening 41 of the overflow pipe 33. At this time, the desired lubricant water level 19 (see FIGS. 1a and 6a) required for lubrication of both gears 13 is achieved. Subsequently, the lubricant plug 45 is installed in the opening 43 on the lower side of the overflow pipe 33. This is to close the overflow pipe 33 and the chamber 11. The monitoring window 27 is then used for an additional visual check of the lubricant water level 19 and for an assessment of lubricant turbidity and coloration. After the chamber 11 is closed, the upper opening 41 of the overflow pipe 33 and its position within the chamber 11 define the lubricant water level 19 within the chamber 11. The overflow pipe 33 is then formed straight, especially within the region of the upper portion 35, and after assembly, is oriented perpendicular to the bottom 25 of the chamber 11 within the outlet opening 23.

6a and 6b show the chamber 11 filled with the lubricant in a side view corresponding to the cross-sectional view of FIG. Further, each orientation of the chambers in FIGS. 6a, 6b, and 6c corresponds to three different built-in postures of the roller piston pump. These are represented for roller piston pumps according to the drilling techniques of FIGS. 1a, 1b and 1c. In FIG. 6a, the roller piston pumps are arranged horizontally as in FIG. 1a. On the other hand, in FIG. 6b, it is tilted to the left by 3 degrees, just as in FIG. 1b, and in FIG. 6c, it is tilted to the right by 3 degrees, just as in FIG. 1c.

In FIGS. 6a, 6b and 6c, the lubricant water level 19 in the chamber 11 is determined by the upper opening 41 of the overflow pipe 33 and thus at the same height as the lower edge of the gear 13. .. Therefore, only the splash disc 17 sinks into the lubricant regardless of the built-in posture or the inclination of the roller piston pump and the chamber. This is because the lower edge is below the lubricant water level 19. The gear 13, on the contrary, sinks at most slightly into the surface of the lubricant. The determination of the lubricant water level 19 by the upper opening 41 of the overflow pipe 33 ensures that the gear 13 or at least the disc 17 does not sink into the lubricant even in the tilted position of the chamber 11.

As can be seen in FIGS. 6b and 6c, the lubricant water level 19 is located above the center of the monitoring window 27 when the chamber 11 is tilted to the left, while the chamber 11 is tilted to the right. At that time, it is located below the center of the lubricant water level 19. This means that when tilting to the left (see FIG. 6b), too high a lubricant water level 19 will be read in the monitoring window 27. Conversely, the chamber 11 is filled to a lubricant water level 19 that is too low, as shown in FIG. 1b, when it would have been filled with lubricant only by monitoring based on the monitoring window 27.

On the contrary, when the chamber 11 is tilted to the right (see FIG. 6c), a too low lubricant water level 19 will be read in the monitoring window 27. This would be too high in the absence of the lubricant water level limiting device 31 as shown in FIG. 1c, when the chamber 11 would, on the contrary, be filled with lubricant only by monitoring based on the monitoring window 27. It will reach water level 19.

Therefore, by the lubricant water level limiting device 31 according to the present invention (in this device, the opening 41 defining the water level 19 is arranged in the spatial vicinity of the pumps 13 and 17 moistened by the lubricant), the roller. The exact lubricant water level 19 for the gear 13 is adjusted regardless of the built-in posture (built-in state) or tilt of the piston pump. This always guarantees sufficient lubrication of the gear 13 and, on the other hand, prevents excessive lubrication of the gear 13 due to subduction too deep into the lubricant. Always accurate lubricant water level 19 extends the life of the gear and shaft 15 as well as the roller piston pump as a whole.

11 Chamber 12 Housing 13 Gear 15 Shaft 17 Splash Disc 19 Lubricant Water Level 21 Inlet Opening 23 Outlet Opening 24 Plug 25 Chamber Bottom 27 Monitoring Window 31 Lubricant Water Level Limiting Device 33 Overflow Pipe 35 Upper Part 37 Central Part 39 Lower part 40 Central shaft 41 Upper opening 43 Lower opening 45 Lubricant plug 47 Thread 49 Seal 51 Sunk part

Claims (9)

In a vacuum pump having a lubricant water level limiting device (31) for limiting the lubricant water level (19) in a chamber (11) in which a component (13) to be lubricated by oil bath lubrication is arranged. Therefore, this lubricant water level limiting device (31) has an overflow pipe (33) and a lubricant plug (45).
The overflow pipe (33), the lower side of the opening (43), the opening of the upper protruding into the chamber (11) has a (41), the overflow pipe (33) comprises a chamber (11) bottom opening (25) in (23) is disposed within,
Wherein the lubricant plug (45), the lower opening of the overflow pipe (33) is (43) is closable,
Wherein and the upper opening (41) is opened, its position, to define a lubricant level (19) in said chamber (11),
The vacuum pump, the two said to be lubricated by the oil bath lubrication component (13), wherein is arranged in the chamber (11), said upper opening of said overflow pipe (33) is (41), It is disposed between the two said components (13), the lubricant level in said chamber (11) in (19) is determined by the overflow the upper opening of the pipe (33) (41), Therefore, as a result of being flush with the lower edge of the component (13), the lubricant water level (19) for the component (13) is adjusted regardless of the built-in orientation or tilt of the vacuum pump. A vacuum pump characterized by being lubricated. Overflow pipe (33) is, are formed straight, the vacuum pump according to claim 1, characterized in that are oriented at right angles to the bottom of the chamber (11). The overflow pipe (33) has a thread (47) along the central portion (37), which thread is provided for engagement with the thread at the bottom (25) of the chamber (11). The vacuum pump according to claim 1 or 2 , wherein the vacuum pump is provided. Chamber (11) position or the upper openings of the overflow pipe (33) of the overflow pipe (33) in the position of (41), any one of claims 1-3, characterized in that the calibratable The vacuum pump described in. The overflow pipe (33) has a lower portion (39) that is located outside the chamber (11), and this lower portion has a stopper, which is the housing of the stopper and the chamber (11). during are arranged spacer elements, the vacuum pump according to any one of claims 1 to 4, characterized in that this by a spacer element is located in the overflow pipe (33) is adjustable. Claims 1 to 5 are characterized in that the opening (23) of the bottom (25) of the chamber (11) in which the overflow pipe (33) is arranged exists at the lowest portion of the bottom (25). The vacuum pump according to any one of the above. The lubricant plug (45) is formed by an element having a thread (47) that engages the thread in the lower opening (43) of the overflow pipe (33). The vacuum pump according to any one of claims 1 to 6 , wherein the vacuum pump can be used. The vacuum pump according to any one of claims 1 to 7 , wherein one or a plurality of permanent magnets having a ring shape are fixed to an overflow pipe (33). A method for filling a chamber (11) with a lubricant according to any one of claims 1 to 8 , and a component of the vacuum pump to be lubricated in the chamber (11) by oil bath lubrication. (13) is arranged,
Lubricant level limiting device having an overflow pipe (33) having openings of the upper and lower side (41, 43) (31) is mounted within an opening in the bottom of the chamber (11),
The chamber (11) is filled with the lubricant until the lubricant enters the upper opening (41).
A method characterized in that a lubricant plug (45) is mounted in the lower opening (43) of the overflow pipe (33) to close the overflow pipe (33) and chamber (11).

Images