JPH0245518Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting mechanism for a gas filtration element to be mounted on the suction side of a cocoon-shaped twin-shaft vacuum pump.

(Prior Art) In a general cocoon-shaped twin-shaft blower, as shown in Fig. 1, a suction port b and a discharge port c are provided on the side of a casing a, and an L-shaped suction pipe d connected to the suction port b It is known that a suction side silencer e is connected to the upper end of the silencer, and an element cover f in which a filtering element for suction outside air is inserted is attached to the upper end of the silencer. Although it is possible to convert the above into a cocoon-shaped twin-shaft vacuum pump by connecting a vacuum pipe to the element case f and modifying other necessary parts suitable for vacuum suction, it is possible to make the silencer e, element case f, etc. larger. The structure is difficult to remove and cannot be used in practice.

(Problems to be solved by the present invention) The present invention has confirmed that it can withstand use even when the filtration element is made of a synthetic resin sponge with relatively low heat resistance, and has also confirmed that it can withstand use even if the filtration element is made of a synthetic resin sponge that has relatively low heat resistance. The problem to be solved is to eliminate the need to use a filter element or an element case, and it is an object of the present invention.

(Means for Solving the Problems) The present invention is a cocoon-shaped device that meets the above-mentioned objectives and is driven by a built-in motor or an external motor, and is provided with a suction port 4 that opens on the side of the casing. In a two-shaft vacuum pump, an inverted T-shaped suction pipe 11 is connected to the suction port 4, and the suction pipe 1
A suitably supported nut 15 is provided at the center of the opening at the rear end connected to the suction port 4 of the horizontal portion 12 of 1,
A gas filtration system in which a screw rod 21 whose tip is screwed into the nut 15 described above is passed through the center of a lid 14 provided on the other opening of the horizontal portion 12, and a screw rod insertion hole 19 through which the screw rod 21 is passed is provided in the center. This invention relates to a filtration element mounting mechanism for a cocoon-shaped twin-shaft vacuum pump, characterized in that an element 18 is inserted and a suction side silencer 26 is provided on a rising portion 13 of the suction pipe 11 corresponding to the flank portion of the element. It is something.

(Embodiment) An embodiment of the present invention will be described with reference to the accompanying drawings starting from FIG.

1 is a cocoon-shaped twin-shaft vacuum pump in which cocoon-shaped twin-shaft rotors 3, 3 are inserted vertically in a casing 2, and the shaft of one cocoon-shaped biaxial rotor 3 is driven by a built-in motor or an external motor. However, the shaft of the other cocoon-shaped two-shaft rotor is interlocked via a timing gear, and a suction port 4 and a discharge port 5 are formed on the flank of the casing 2. (The above is publicly known) In the above configuration, the present invention has an inverted T at the suction port 4.
The shaped suction pipe 11 is connected. The horizontal part 12 of the suction pipe 11 is used as an insertion pipe part for a gas filtration element, and the rising part 13 is used as a mounting pipe part for a suction side silencer.

A transparent or opaque element cover 14 is applied to the open opening at one end of the horizontal part 12 via a gasket, and a nut 15 is appropriately supported at the center of the rear end of the horizontal part 12 that communicates with the suction port 4. The packings 16 and 17 are placed against the outer enlarged diameter stepped portion of the nut 15 and the nut 15. 18 is element lid 1
It is a cylindrical gas filtration element which is detachably inserted into the horizontal part 12 by removing the part 4, and has a threaded rod insertion hole 19 in the center. One end of this element is placed against the gaskets 16 and 17, a small ring-shaped gasket 20 is placed on the other end, and a screw rod 21 passed from the outside of the element lid 14 is inserted into the small ring-type gasket 20 and the screw rod insertion hole of the element 18. 19 and tighten it to nut 15. Reference numeral 22 denotes a tightening nut body screwed onto the threaded rod 21 on the outer end surface of the packing lid 14, and the packing 23 is interposed between the nut body 22 and the packing lid 14.
Both ends of a coil spring 24, which is loosely fitted to the threaded rod 21, are brought into elastic contact between the small ring-shaped packing 20 and the inner surface of the element lid 14.

The gas filtration element 18 does not need to be made of a material with excellent heat resistance, and as shown in FIG.
, with side plates 33 and 33 on both sides, or a flexible porous resin pine tress punched into a cylindrical shape 34 as shown in FIG. A hard or semi-hard synthetic resin cylinder cut into a short cylindrical shape 35 is used.

In FIG. 2, 26 is a suction-side silencer connected to the rising portion 13 by inserting a connecting pipe 27 on the lower surface thereof, and 28 is a discharge-side silencer connected to the discharge port 5 via an elbow pipe 29.

(Operations and Effects) As clarified by the explanation of the above embodiments, the present invention provides a suction port 4 that opens on the side of the casing 2.
In the cocoon-shaped twin-shaft vacuum pump, an inverted T-shaped suction pipe 11 is connected to the suction port 4 of the casing 2.
A properly supported nut 15 is provided at the center of the opening at the rear end of the horizontal part 12 of the suction pipe 11 connected to the suction port 4, and a nut 15 is provided at the center of the lid 14 applied to the other opening of the horizontal part 12. Pass the screw rod 21 whose tip is screwed into the nut 15 described above, and insert the gas filter element 18 having a screw rod insertion hole 19 in the center through which the screw rod 21 passes, and insert the gas filter element 18 on the side of the element of the suction pipe 11 Rising part 13 corresponding to the abdominal part
This relates to a filtration element mounting mechanism for a cocoon-shaped twin-shaft vacuum pump characterized in that a suction side silencer 26 is provided in the casing 2. However, since the cold outside air from the suction side siren 26 passes through the element 18, there is no need to select a particularly heat-resistant element, and a small element is sufficient, so manufacturing, replacement, etc. are not necessary. It has an effect that is easy to perform.

For this reason, for example, in order to supply small pieces to a press machine, this vacuum pump is connected to a cup that sucks the small pieces to create a vacuum (or negative pressure) for suction. This has the effect of effectively removing particles just before they are sucked in by the rotor drive, and has the effect of providing a small cocoon-shaped two-shaft vacuum pump.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a conventional Roots blower.
Figure 2 is a longitudinal cross-sectional side view of the present invention, Figure 3...
1 is a perspective view showing several examples of gas filtration elements; FIG. 2... Casing, 4... Suction port, 11... Inverted T-shaped suction pipe, 12... Horizontal part, 13... Rising part, 14... Lid, 15... Nut, 18... Gas filtration element, 19 ...Screw insertion hole, 21...
Screw rod, 26...Suction side silencer.

Claims (1)

[Scope of utility model registration request] In a cocoon-shaped twin-shaft vacuum pump that is driven by a built-in motor or an external motor and is provided with a suction port 4 that opens on the side of the casing, an inverted T-shaped suction pipe 11 is connected to the suction port 4, and the suction pipe 11 is connected to the suction port 4. tube 1
A suitably supported nut 15 is provided at the center of the opening at the rear end connected to the suction port 4 of the horizontal portion 12 of 1,
A gas filtration system in which a screw rod 21 whose tip is screwed into the nut 15 described above is passed through the center of a lid 14 provided on the other opening of the horizontal portion 12, and a screw rod insertion hole 19 through which the screw rod 21 is passed is provided in the center. A filtration element mounting mechanism for a cocoon-shaped twin-shaft vacuum pump, characterized in that an element 18 is inserted and a suction side silencer 26 is provided on a rising portion 13 of the suction pipe 11 corresponding to the flank portion of the element.