TWI660128B - Rotary-vane vacuum pump - Google Patents

Abstract

The invention relates to a rotary vane vacuum pump having a drive motor (1, 17) cooperating with a vacuum vane pumping chamber (2), wherein the pump is set from all visible surfaces above such that they are not susceptible to liquid retention Or solid components. The driving motor (1) may be, in particular, an air-cooled asynchronous motor or a water-cooled asynchronous motor, which has a cover and forms a space with which the cylinder (18) can circulate refrigerant.

Description

Rotary vane vacuum pump

The present invention relates to a rotary vane vacuum pump, and is particularly used in industries that need to comply with specific hygiene rules when the pump is running or during the cleaning process.

Rotary vane vacuum pumps have been around for a long time. This type of pump has a rotor equipped with a number of blades (called "blades") that slide in the radial direction and ensure the transfer of pumped air.

The pump described in published European patent application EP0166807 is one such example. As can be seen particularly in Figure 1 of this document, "traditional" vane pumps are provided with blades in some places on the exterior, which can form a liquid or solid retention area or prevent natural flow. This makes this type of pump unsuitable or even completely unsuitable for a particular application.

In fact, liquids or solids can deposit and stagnate in stagnant areas on the surface of the pump, resulting in the generation of pathogenic microorganisms (molds, bacteria, etc.), which poses the risk of contamination.

The main object of the present invention is therefore to propose a rotary vane vacuum pump which does not have the aforementioned disadvantages and which can be used particularly in environments subject to strict hygiene standards.

This objective is achieved by a rotary vane vacuum pump with a special feature in that all visible surfaces of the pump are set in such a way that they have no components that easily retain liquid or solids. Especially on at least a part of this, the pump can be provided with a protection means without surfaces or cavities that are liable to retain liquid or solids.

This pump has the advantage of being easier to clean. It is therefore suitable for all applications in the industry where specific hygiene rules are required.

1‧‧‧Drive motor

2‧‧‧ pumping room

3‧‧‧ exit

5‧‧‧ cooling blade

6‧‧‧ means of protection

7‧‧‧Electrical sheath

8, 9, 10, 11, 12‧‧‧ upper surface

13, 14‧‧‧ support

15‧‧‧upper surface

16‧‧‧ cooling blade

17‧‧‧Drive motor

18‧‧‧ cylinder

19, 20‧‧‧ orifice

21, 22, 23‧‧‧ upper surface

24‧‧‧oil mist separator

25‧‧‧ support block

V1‧‧‧ heat exchanger

V2‧‧‧Cylinder

Other features and advantages of the present invention will now be described in detail below, which is schematically presented with reference to the attached drawings: Figure 1: Rotary vane vacuum pump according to the prior art of the present invention; Figure 2: Pump according to Figure 1, It is shown according to a first embodiment of the invention; Figures 3, 4 and 5: a front perspective view, a rear perspective view and a clockwise front perspective view of a pump according to a second embodiment of the invention; 6. Figs. 7 and 8: Views corresponding to the pump according to the second embodiment of Figs. 3, 4 and 5, respectively, the pump being equipped with an oil mist separator.

As already mentioned, the rotary vane vacuum pump according to the invention is characterized in that all visible surfaces above it are set in such a way that they have no elements that tend to retain liquid or solids. Such surfaces must be external, which can be formed by cooling blades, and they are located in the upper half of the vacuum pump. It is assumed that the surface located in the lower half of the vacuum pump cannot retain liquid or solids due to gravity. Here, it seems important to indicate that the adjectives "top half" and "bottom half" used in this article (and those in the scope of this specification and patent applications) refer to the operation of the pump or when it is preparing to operate Normal position.

In order to achieve the lack of the upper half surface of a component that is prone to liquid or solid retention, it is particularly possible to design the upper half surface in a smooth manner. This can be achieved during the production of parts of the pump, for example during turning of the outer wall of the pumping chamber.

Alternatively, the pump may also be provided with protection means for the upper half surface on at least a part. These means of protection must also not have pockets, such as grooves, in the upper half of the rotary vane vacuum pump for liquid or solids to be trapped therein.

<First Embodiment>

To help understand the first embodiment of the present invention, reference may be made to FIG. 1, which presents a prior art rotary vane vacuum pump.

The pump includes in particular a drive motor, such as an air-cooled asynchronous motor. It is well understood that depending on the construction design, it is also possible to use another type of motor, including a water-cooled motor. The motor is coupled to the pumping chamber 2. The purpose is to rotate the latter's rotor, so that the pump can fulfill its pumping function. The middle cylinder V2 successively drives the motor to the pumping chamber 2, and the middle cylinder normally contains a connection element between the drive motor and the pumping chamber 2.

Such a pumping chamber 2 is known per se; it usually comprises a rotor which is accommodated in a cylindrical bore with blades.

The pumping chamber 2 may be provided with oil, that is, an oil circulation system for lubrication is provided in this example to ensure tightness and allow heat exchange.

The oil is separated from the gas pumped into the oil mist separator (not shown in the figure) in such a manner that the air before it is recirculated to the atmosphere through the exit of the outlet 3 is purged of the oil contained therein.

The pumping chamber 2 is similarly connected to the heat exchanger V1 with an integrated ventilator (not shown), which is used to cool the heat generated by the pumping chamber 2 during operation.

The drive motor 1 and the pumping chamber 2 are preferably detachably connected, which allows either of them to be replaced in the event of a malfunction.

It is clear from FIG. 1 that the pumping chamber 2 and the drive motor 1 contain cooling blades 5 around them. Such vanes in principle lead to the pump according to the prior art being unsuitable for use in areas that need to meet certain hygienic conditions and are easy to clean on site, because as already explained previously, the vanes can retain liquid or solids.

Therefore, it can be seen from the first embodiment of the present invention with reference to FIG. 2 that all the upper surfaces of the pumps (and therefore all surfaces visible from above) are set in such a way that they avoid susceptible to liquid retention or solid. As can be seen from the analysis in Figure 2, such smooth surfaces can be obtained by: they are formed in such a way that they do not include components that tend to retain liquids or solids; or they provide protection means that they do not themselves retain liquids or solids easily A solid surface or cavity.

Figure 2 shows that the upper surface of a part of the pump (particularly the part of the pumping chamber 2) contains only a smooth surface. These surfaces therefore do not contain any components that are susceptible to liquid or solids, so as to allow any liquid that may fall on the pump to flow naturally or any solid to slide naturally. Furthermore, FIG. 2 also shows other possibilities for achieving the extraordinary features of the invention, namely cap-like protection means 6, that is, they basically have a semi-cylindrical shape, which in this example covers the drive motor 1 The upper part. Of course, it is well understood that similar pumps can be implemented according to the spirit of the present invention, wherein the protection means 6 may be located in other parts of the pump, such as on the pumping chamber 2.

As mentioned earlier, "upper" refers to the situation where the pump according to the present invention is horizontally set, that is, when the rotation axis of the drive motor 1 and the rotation axis of the rotor of the pumping chamber 2 are substantially the same and parallel to the ground The supports 13, 14 lie flat on the ground normally (or the supports are parallel to the ground).

The adverb "substantially" used above means that the shape of the protection means 6 naturally conforms to the shape of the drive motor 1, for example having a cutout to allow the electric appliance sheath 7 to protrude.

According to FIG. 2, the protection means 6 only covers the upper blade 5 of the drive motor, and the lower blade 16 is exposed at the lower portion of the drive motor 1.

Preferably, the protection means 6 is removable. This has the advantage that it is easy to access the drive motor 1 during inspection and thorough cleaning.

It is also preferred to provide at least certain and ideally all the upper surfaces of the drive motor 1 and / or the pumping chamber 2 (i.e. those surfaces visible from above) in a downwardly inclined manner so that during cleaning it is allowed Liquids or solids on these surfaces now flow away or slip away to remove these liquids or solids.

Examples of the upper surface may be reference numerals 8, 9, 10 and 11 for the pumping chamber 2 and reference numerals 12 and 15 for the drive motor 1 as in FIG.

When the supports 13 and 14 lie flat on the ground, the inclined angle of the surface is preferably at least 5 degrees relative to the ground.

Preferably, it is similarly provided that the oil mist separator includes a support block that is common to the filter and the heat exchanger for the oil to make it compact, easily accessible, and easy to clean.

<Second Embodiment>

A second embodiment of the present invention is shown in FIGS. 3 to 7.

As seen in these figures, the rotary vane vacuum pump comprises a pumping chamber 2 which can be as shown in FIGS. 1 and 2 and which is connected to a drive motor 17. This includes, in particular, a double-layered cover having an exterior formed by a cylinder 18, as shown in FIG. 3, all or nearly all of its outer surfaces are smooth. The inside of this double-layer cover is actually the housing of the motor not seen in Fig. 3, which in a known manner contains the normal parts of a rotary vane vacuum pump motor, The motor may be an asynchronous drive motor.

Preferably, the outer surface of the cylinder 18 is smooth. Compared to the first embodiment, the outer surface (compared to FIG. 2) is generally provided with cooling blades 16.

The cylinder 18 is spaced from the housing shell (smoothly or not) in such a way that a space is formed for the refrigerant (such as liquid, especially water) to circulate through the orifices 19 and 20.

The advantage of water cooling is that the heat generated by the drive motor 17 can be removed without involving the blades 16 (see FIG. 2), and the surface allows heat exchange with air.

Preferably, the cylinder 18 is shielded, ie its free end is closed to facilitate cleaning of the pump.

Generally, in this embodiment, the cylindrical body 18 is not removable because it is fixed to the housing of the drive motor 17. However, it is also contemplated that the cylinder 18 can be disassembled in a particular embodiment.

As with the first embodiment according to the invention, it is advantageous to provide certain (preferably all) upper surfaces (such as surfaces of 8, 9, 10, 11, 15, 21, 22 and 23) with an inclination.

In addition, when using a lubricated vane-type pumping chamber 2, an oil mist separator as shown in Figs. 6, 7 and 8 is usually provided. Preferably, the oil mist separator includes a support block that is common to the filter and the heat exchanger 25 for oil, which makes the entire structure compact, easy to access, and easy to clean.

What has just been described are several embodiments of the device according to the invention Examples, which are not limited to the scope of the invention, which is mainly defined in the scope of the patent application.

Those skilled in the art will understand the possibilities of the development, modification and application of the pump according to the invention, especially in other areas which are increasingly important for compliance with hygiene standards.

Claims (12)

A rotary vane vacuum pump comprising a drive motor (1) cooperating with a pumping chamber (2) for vacuum vane pumping, wherein all surfaces located on the upper half of the vacuum pump are set so that they are not liable to stay A liquid or solid element; wherein at least a part of the vacuum pump is provided with protection means (6), which basically has the shape of a semi-cylinder covering at least an upper part of the vacuum pump; and wherein the protection means (6) can be removed In addition, there are no surfaces or cavities that are susceptible to liquid or solid retention. According to the rotary vane vacuum pump according to the first patent application scope, the protection means (6) is provided only at the level of the driving motor (1). The rotary vane vacuum pump according to item 1 of the patent application scope, wherein the drive motor (1) is an air-cooled asynchronous drive motor. The rotary vane vacuum pump according to item 1 of the patent application scope, wherein when the rotation axis of the driving motor (1) and the rotation axis of the rotor of the pumping chamber (2) are parallel to the ground, the driving motor (1) or the At least a specific upper surface (8, 9, 10, 11, 15, 21, 22, and 23) of the pumping chamber (2) is inclined downward. The rotary vane vacuum pump according to the first patent application scope, wherein the pumping chamber (2) includes a rotor with blades, and the blades are lubricated by oil. The rotary vane vacuum pump according to item 1 of the patent application scope, wherein the pumping chamber (2) is connected to an oil mist separator (24). The rotary vane vacuum pump according to item 6 of the patent application scope, wherein the oil mist separator (24) includes a support block (25), which is common to the filter and the heat exchanger for oil. A rotary vane vacuum pump comprising a drive motor (17) cooperating with a pumping chamber (2) for vacuum vane pumping, in which all surfaces located on the upper half of the vacuum pump are set so that they are not liable to stay A liquid or solid element; wherein the drive motor (17) includes a double-layered housing, the outer portion of which is formed by a cylinder (18), and the drive motor (17) is a water-cooled asynchronous drive motor, which has an outer cover and communicates with the cylinder ( 18) forming a space where the refrigerant can be circulated; and wherein the cylinder (18) is a closed cylinder having a smooth outer surface. The rotary vane vacuum pump according to item 8 of the patent application scope, wherein when the rotation axis of the driving motor (17) and the rotation axis of the rotor of the pumping chamber (2) are parallel to the ground, the driving motor (17) or the At least a specific upper surface (8, 9, 10, 11, 15, 21, 22, and 23) of the pumping chamber (2) is inclined downward. The rotary vane vacuum pump according to item 8 of the patent application scope, wherein the pumping chamber (2) includes a rotor with blades, and the blades are lubricated by oil. The rotary vane vacuum pump according to item 8 of the patent application scope, wherein the pumping chamber (2) is connected to an oil mist separator (24). The rotary vane vacuum pump according to item 11 of the application, wherein the oil mist separator (24) includes a support block (25), which is common to the filter and the heat exchanger for oil.