KR20160002963A - Vane-Type Rotary Vacuum Pump - Google Patents

Abstract

The present invention relates to a vane type rotary vacuum pump comprising a drive motor (1, 17) which cooperates with a vane pump vacuum chamber (2), in which all pump surfaces as viewed from above have liquid or solid It is constructed in such a way that it does not have the same elements. The drive motor 1 is in particular an air-cooled asynchronous motor or a water-cooled asynchronous motor, which has a case which together with the cylinder 18 forms a space through which the cooling fluid can circulate.

Description

Vane-Type Rotary Vacuum Pump [0002]

The present invention relates to a rotary vane vacuum pump, particularly to a pump that is used in industries where cleaning operations are required and in which it is necessary to comply with certain regulations for hygiene during operation of the pump.

Rotating vane vacuum pumps have existed for a long time. In such pumps, the rotor is provided with a plurality of blades (referred to as "vanes"), which ensure radial sliding and delivery of pumped air.

EP 0 166 807 is one example of such a pump. Particularly, as can be seen in Figure 1 of this patent document, a "conventional" vane pump is provided with blades at a plurality of locations on its outer surface, which blades can form holding areas of liquids or solids Or natural flow. This makes the pump of this type very inadequate or totally inappropriate in a certain number of applications.

In fact, liquids or solids can accumulate in the holding areas on the surface of the pump and can remain in a stagnant state, thus increasing the multiplicity of pathogenic organisms (molds, bacteria, etc.) ≪ / RTI >

Therefore, the main object of the present invention is to propose a rotary vane vacuum pump which does not have the above-mentioned disadvantages, which can be used particularly in environments where strict hygiene standards are applied.

This object is achieved by a rotary vane vacuum pump having a special configuration in which all the surfaces of the pump seen from above are set in such a way that they exclude elements which are liable to contain liquids or solids. In particular, such pumps may be provided with protective means in at least one portion, without cavities or surfaces that are liable to retain liquids or solids.

The pump has the advantage of being easily cleaned. It is therefore appropriate for all uses of the industry that need to comply with specific hygiene regulations.

Other features and advantages of the present invention will be described in detail in the following detailed description, given with reference to the accompanying drawings, which are schematically illustrated.
1 shows a rotary vane vacuum pump according to the prior art of the present invention.
Figure 2 shows the pump of Figure 1, shown in accordance with a first embodiment of the present invention.
FIGS. 3, 4 and 5 show perspective views of the front, rear and front, respectively, after the pump according to the second embodiment of the present invention is pivoted clockwise.
6, 7 and 8 are views corresponding to FIGS. 3, 4 and 5, respectively, of a pump according to a second embodiment in which an oil mist separator is installed.

As already mentioned, the rotary vane vacuum pump according to the invention is characterized in that it is set up in such a way that it lacks liquid or solids-prone elements on all the surfaces shown above. Such surfaces, which are inevitably external, can be formed by cooling vanes, and if the surfaces disposed on the lower half of the vacuum pump can not hold liquids or solids due to gravity, As shown in FIG. Herein, the terms "upper" and "lower" used herein (and used in the description and claims) refer to the normal position of the pump when the pump is in operation or being ready for operation.

It is possible to design the upper portion of the surfaces in a particularly smooth manner so as to achieve an upper surface lacking elements liable to contain liquid or solids. This can be done during the manufacture of the parts making up the pump, and thus for example during the machining of the outer walls of the pump chamber.

Alternatively, the pump may be provided with protective means for the upper surface on at least one part. Such protection means must likewise lack cavities, for example grooves, which are located on the upper half of the vacuum pump and in which the liquid or solid can be stagnated.

1st Example

For a better understanding of the first embodiment of the present invention, we start with reference to FIG. 1 which shows a rotary vane vacuum pump according to the prior art.

Such pumps include in particular drive motors and include, for example, air-cooled asynchronous motors. It will be appreciated that, depending on the design of the structure, other types of motors may be used, including water cooling motors. This motor is coupled to the pump chamber 2 for the purpose of rotationally driving the rotor of the pump chamber so that the pump can perform the pumping function. The intermediate cylinder (V2) connects the drive motor to the pump chamber (2), which typically includes elements connecting between the drive motor and the pump chamber (2).

The pump chamber 2 is known; The pump chamber includes a rotor housed in a cylindrical bore and the rotor supports the vanes.

The pump chamber 2 may be provided with an oil, i. E. In such a case, a circulating system of oil for lubrication is provided to ensure tightness and permit heat exchange.

The oil is separated from the gas pumped in an oil mist separator (not shown), in which air from the oil contained in the air can be cleaned before the air exiting through the outlet 3 is recycled to the atmosphere .

The pump chamber 2 is likewise connected to a heat exchanger V1 having an integrated ventilator (not shown), which serves to cool the pump chamber 2 which is reheated during operation of the pump.

The drive motor 1 and the pump chamber 2 are preferably connected in a removable manner, which allows one or the other to be replaced in the event of a failure.

As can be clearly seen in Fig. 1, the pump chamber 2 and the drive motor 1 include cooling vanes 5 on the circumference thereof. This is in principle a vane according to the prior art which makes the pump unsuitable for use in areas requiring compliance with certain regulations on hygiene and easy cleaning in the field, Because it can hold solids.

For this reason, according to the invention of the first embodiment, which can be understood with reference to figure 2, in a manner that lacks elements which are liable to contain liquid or solids on all the upper surfaces of the pump, It is expected that the surfaces are set. As can be seen from the analysis of Fig. 2, the surfaces from above are formed in such a way that they do not contain liquid or solids-prone elements, or they form cavities or surfaces that are free of liquids or solids By providing protective means, such a smooth surface can be obtained.

2 shows that the upper surface of a portion of the pump (particularly the portion of the pump chamber 2) has only a smooth surface. These surfaces therefore do not include any elements that are likely to have a liquid or solid to allow the natural slip of that solid or the natural flow of that liquid to fall on the pump. Fig. 2 also shows another possibility for achieving a separate feature of the invention, namely a protective means 6 similar to a lid cap, which in this case substantially corresponds to the upper part of the drive motor 1 Has the shape of a half cylinder to cover. Of course, it will be appreciated that the pump can be similarly achieved in the context of the present invention, where the protection means 6 can be located in other parts of the pump, for example pump chamber 2.

By means of the "upper part" referred to here as above, when the pump according to the invention is arranged horizontally, that is to say the rotation axis of the drive motor 1 and the rotation axis of the rotor of the pump chamber 2, When parallel to the ground, the supports 13, 14 of the pump normally rest on the ground (or the support is parallel to the ground).

The use of the expression "substantially" above means that half of the cylinders 6 have a configuration adapted to the drive motor 1, for example half the cylinders, And has a cutout that allows it.

2, half of the cylinders 6 cover only the upper vanes 5 of the drive motor and the lower vanes 16 appear in the lower portion of the drive motor 1. [

Preferably, half of the cylinders 6 are removable, which has the advantage that access to the drive motor 1 can be facilitated in the case of inspection and full cleaning.

At least the specific upper surface and ideally all the upper surfaces of the drive motor 1 and / or the pump chamber 2, i.e. the upper surfaces seen from above, are in fluid communication with the upper surface when the liquid or solids are present on the upper surface, It is likewise desirable that the liquid or solid be sloped down in such a way that the liquid or solid can be removed by the flow of the solid or by slipping of the solid.

As an example of the upper surface, reference can be made to the pump chamber 2 in FIG. 2 as indicated by reference numerals 8, 9, 10 and 11 and to the drive motor 1 as indicated by reference numeral 12.

When the supports 13, 14 are placed on the ground, the inclination of the associated surfaces is preferably at least 5 degrees with respect to the ground.

Preferably, the oil mist separator includes a block support common to the heat exchanger and filter for the oil, which is compact, accessible and easily cleanable do.

Second Example

A second embodiment of the present invention is shown in Figures 3-7.

As can be seen in the drawing, the rotary vane vacuum pump has a pump chamber 7, which can be understood from FIGS. 1 and 2, which is connected to a drive motor 17. This has in particular a double casing with an outer portion formed by the cylinder 18 shown in Fig. 3, all of which, or some of them, become smooth outer sides. The inner portion of the double casing, which in fact is the housing of the motor not visible in Fig. 3, comprises conventional components of a rotary vane vacuum pump motor which can be an asynchronous motor in a known manner.

Preferably, the outer surface of the cylinder 18 is smooth as opposed to the first embodiment, in which cooling vanes 16 are generally provided on the outer surface (FIG. 2) in the first embodiment.

The cylinder 18 is spaced from the housing (smooth or otherwise) in such a way as to form a space in which a coolant such as liquid, in particular water, can be circulated through the orifices 19 and 20 have.

The advantage of water cooling is that it is possible to remove the heat generated by the drive motor 17, without relying on the vanes 16 (Fig. 2) to allow heat exchange with the air at the surface.

Preferably, the cylinder 18 is clogged, i.e. closed at its free end, which facilitates cleaning of the pump.

Overall, in this embodiment, the cylinder 18 is not removable because it is fixed to the housing of the drive motor 17. [ However, a particular embodiment of the invention in which the cylinder 18 may be removed may also be predicted.

As in the first embodiment of the present invention, it is advantageous to provide the inclination of certain top surfaces, and preferably all top surfaces, such as surfaces 8,9,10,11,15,21,22,23 .

Also, in the case of using a lubricated vane pumping chamber 2, it is common to provide the oil mist separator shown in Figs. 6, 7 and 8. This separator preferably includes a block support 25 common to the heat exchanger and filter for the oil, which makes the separator compact, accessible and easy to clean.

The description given with respect to a plurality of embodiments of the apparatus according to the present invention is not restrictive, and the scope of the present invention is mainly defined by the claims.

Those skilled in the art will appreciate the possibility of developing, modifying and applying the pump according to the present invention, particularly in other fields where it is important to comply with enhanced levels of hygiene.

1. Drive motor 2. Pumping chamber
7. Electrical casing 13.14. Support

Claims (13)

A rotary vane vacuum pump comprising a drive motor (1, 17) which cooperates with a chamber (2) for vacuum vane pumping, wherein all surfaces of the pump as seen above are either liquid or solid Is set in such a manner that the components that are likely to be retained by the rotary vane are lost. The method according to claim 1,
The pump is provided with protective means (6) lacking in surfaces or cavities which are susceptible to holding liquids or solids, at least in part. 3. The method of claim 2,
Said protective means having the shape of a substantially half-cylinder (6) covering at least one upper portion of the pump. The method according to claim 2 or 3,
The protective means (6) are removable, rotary vane vacuum pumps. 5. The method according to any one of claims 2 to 4,
The protective means (6) is located only at the level of the drive motor (1). The apparatus according to any one of the preceding claims,
The drive motor (1) is an air-cooled asynchronous motor. The method according to claim 1,
The drive motor (17) includes a double casing having an outer portion formed by the cylinder (18). 8. The method of claim 7,
Wherein the cylinder (18) is a cylinder that is blind. 9. The method according to claim 7 or 8,
Wherein the drive motor (17) is a water-cooled asynchronous motor having a housing (18) having a space in which a coolant can be circulated. The apparatus according to any one of the preceding claims,
When the rotational axis of the drive motors 1 and 17 and the rotational axis of the rotor of the pumping chamber 2 are parallel to the ground surface, at least one of the upper surfaces of the drive motors 1, 17 and / (8, 9, 10, 11, 15, 21, 22, 23) are inclined downward. The apparatus according to any one of the preceding claims,
The vanes are oil-lubricated, rotary vane vacuum pumps. In one aspect of the present invention,
The pumping chamber (2) is connected to an oil mist separator (24). In one aspect of the present invention,
The oil mist separator (24) comprises a block support (25) common to the heat exchanger and filter for the oil.

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