JPH02185684A - Vacuum draw pump - Google Patents

Abstract

PURPOSE:To ensure supply of materials by furnishing in a casing an eccentric rotor equipped with a plurality of slidable vanes, and providing a deaeration path for vacuum pump draw in that place of the casing where both the suction and discharge holes are shut off by vanes. CONSTITUTION:A vacuum draw pump 1 has a vane pump 2 and a vacuum pump 3. Material in the form near solid state such as cream or sweet bean paste is transported from a hopper 8 by a plurality of vanes 7 supported slidably by an eccentrically arranged rotor 6. A deaeration path 11 is formed outside the material transport path of a pump casing 4 and opens to a space B to be shut by vanes 7 simultaneously with respect to the suction hole 9 and discharge hole 10. This deaeration path 11 is connected with a vacuum pump 3 via a separator 14. The space B is deaerated to become vacuum to ensure supply of material from the hopper 8 through the suction action. Because the material transported is free from extra voids, dividing into specified weights by a cutter near the discharge hole does not produce dispersion in the weight.

Description

DETAILED DESCRIPTION OF THE INVENTION 0) Industrial Application Field The present invention relates to a vacuum pump, and more particularly to a vacuum pump for conveying food materials such as cream, filling, pastry dough, etc.

(B) Conventional technology Conventionally, the material supplied to the suction port by gravity from a hopper is rotated so that it slides on a vane that is slidably attached to a rotating rotor and on the wall surface of the pump chamber of the casing. A vane pump is known in which material is discharged from a discharge port through a material conveyance path formed by a space between a rotor and a wall surface of a pump chamber.

Q9 Problems to be Solved by the Invention However, with the conventional vane pump, there is no problem with fluids, but in the case of materials that are close to solids such as cream, bean paste, and pastry dough, the materials may cause a bridging phenomenon in the hopper. In vane pumps, the vacuum suction effect can be obtained by making the clearances between the casing, rotor, and vane sliding members very small.
For this purpose, it is necessary to improve the machining accuracy of the pump, which has the drawback of increasing costs.

Furthermore, for hygiene reasons, pumps that suck food materials need to be easy to disassemble and reassemble and clean, and this can cause wear, making it extremely difficult to maintain a small clearance. be.

An object of the present invention is to eliminate the drawbacks of the conventional vane pumps described above, to provide an inexpensive pump that can smoothly supply and convey materials close to solids, and does not require high processing accuracy.

B) Means for Solving the Problems In order to achieve the above object, the present invention forms a degassing path that opens into the pump chamber at a position where both the intake port and the discharge port of the vane pump are blocked by the vane, The food material was suctioned and conveyed by a vacuum pump that connected the degassing path to a vacuum pump.

[Operation] According to the present invention, a space to be degassed by the vacuum pump is formed between the vanes without communicating with the suction port and the suction port, and as the rotor rotates, the degassed space communicates with the suction port. When the hopper moves to a certain position, the material in the hopper is sucked into the space by the vacuum effect.The space into which the material is sucked transports the material as it moves due to the rotation of the rotor, and then discharges it from the discharge port.

〔Example〕

Hereinafter, the embodiments will be described in detail according to the embodiments shown in the drawings.

In FIG. 1, a vacuum pump (1) according to the present invention includes a vane pump (2) and a vacuum pump (3).

The vane pump (2) includes a pump casing (4), a rotor (6) eccentrically arranged and rotatably supported in a pump chamber (5) of the pump casing (4), and a rotor (6) that slides in the radial direction. and a movably supported vane (7).

A material suction port (9) connected to the hopper (8) and a discharge port (lO) are formed in the pump casing (4). The material supplied from the material suction port (9) is fed through a vane (
7). The vanes (7) move relative to the rotor (6) in the radial direction so that their tips slide in contact with the casing wall surface of the pump chamber (5).

2 adjacent between the material inlet (9) and the outlet (10)
two vanes (7), rotor (6) and pump casing (
4) The space confinement formed between the wall and the wall (shown by cross-hunting in Figure 1) is formed as a material conveyance path that does not reduce volume, but materials that are easily damaged by shearing action or stirring action, such as cream and bean paste, However, it is not particularly limited to this non-compressible pump.

A degassing passage (11) is formed in a region outside the material conveying path of the pump casing (4), and this degassing passage (11) connects the rotor (6) and the inner circumferential wall of the pump casing (4) outside the material conveying path. It opens into the space ■ formed between. This space■
The intake port (
9) and the discharge port (10) are simultaneously blocked.

The degassing path (11) is connected to the separator (1) by the connecting pipe (13).
4), and the separator (14) is connected to a vacuum pump (3).
) is connected.

Due to the action of the vacuum pump, the space (■) is deaerated and becomes a vacuum, and when the space (■) moves and communicates with the material suction port (9),
The suction action draws the material in the hopper (8) into the space (2).

The material suction action facilitates the supply of the material from the hopper (8) and enables reliable supply.

The shape of the vane pump (2) is changed to the second shape instead of the example shown in FIG.
It can be modified as shown in the figure. Figure 1 shows an example in which the material is conveyed in a straight line from the material inlet (9) to the outlet (10), while Figure 2 shows the material being conveyed from the material inlet (91) to the outlet (10''). , is an example of changing the material transfer direction by 90 degrees.From point X, which is part of the pump chamber (5) in Fig. 2, to Y
In the range up to the point, there are two vanes (7) and a rotor (6)
The space between the rotor (6) and the inner wall surface of the pump casing (4) maintains a constant distance between the rotor (6) and the inner wall surface of the pump casing (4), so that even if the vane (7) moves, the material storage volume decreases. I try not to do that.

This allows the material to be conveyed in a non-compressible manner.

In the example shown, three vanes (7) are inserted into the rotor (6) in such a manner that they cross each other and can move relative to each other, and both ends of the vanes (7) are arranged in the radial direction of the rotor (6). The pump chamber (5) is configured to be able to move in and out, and the shape of the pump chamber (5) is formed to match the movement of the vane (7). However, the shape and number of vanes are not limited. 6 Even if the vane is configured such that only one end of the vane protrudes from the rotor, as in a conventional vane pump, the scope of the present invention also falls within the scope of the present invention.

(e) Effects According to this invention, the material can be transported incompressibly and degassed sufficiently, and furthermore, the supply of the material from the popper to the material suction port is facilitated by the vacuum action, ensuring reliable supply is now available.

Furthermore, by attaching a cutter to the discharge port of the suction pump according to the present invention, it has become possible to quantitatively divide semi-solid substances such as cream and bean paste.

In this case, the material in the hopper often contains extra space, and this air is drawn in as the material is drawn into the pump, especially if the pump is of incompressible construction. In this case, there is no compression while the material moves through the pump, so the sucked air has no place to escape and is discharged along with the material. If the cutter is operated in a constant cycle, the weight will vary. will occur. However, according to this invention, the vane pump is subjected to suction action by the vacuum pump, so when the material is sucked into the pump from the hopper, excess air is sucked through the degassing path and is trapped in the space between the vanes of the pump. The material that does not contain excess air can be inserted into the machine, and by installing a cutter that operates in partial cycles using a timer after discharge, it is also possible to obtain a simple fixed-quantity dividing machine.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a part of a vacuum pump according to the present invention, and FIG. 2 is a cross-sectional view showing a modification of the vane pump. l・・・・・・・・・・・・・・・・・・・・・Vacuum pump 2・・・・・・・・・・・・・・・・・・・・・
Vane pump 3・・・・・・・・・・・・・・・・・・
・・・Vacuum pump 9・・・・・・・・・・・・・・・・・・
...Material intake port 10... Old...
・・・・・・Discharge port 11・・・・・・・・・・・・・・・
・・・・・・Degassing path diagram 2

Claims (1)

[Scope of Claims] 1. A casing having an inlet port and a discharge port, a rotating rotor eccentrically arranged in a pump chamber in the casing, a plurality of vanes slidably arranged on the rotor, a degassing passage formed in the casing and opening into the pump chamber, the degassing passage being connected to a vacuum pump;
Outside the material conveyance path from the suction port to the discharge port,
A vacuum pump characterized in that the deaeration path opens at a position where both the suction port and the discharge port are blocked by a vane. 2. The vacuum pump according to claim 1, wherein the degassing path and the vacuum pump are connected via a separator.