Multi-stage screw structure on screw vacuum pump for plastic uptake processing

Abstract

The utility model provides a multi-stage screw structure on a screw vacuum pump for plastic uptake processing, and belongs to the technical field of plastic uptake processing. Comprising a shell, a female rotor rotationally connected into the shell and a male rotor meshed with a female screw, the male rotor comprises a rotating shaft and a plurality of screw sections distributed on the rotating shaft at intervals, a gap is formed between every two adjacent screw sections, and the two ends of the shell are provided with an exhaust cavity and a tail end negative pressure cavity respectively. A middle negative pressure cavity is also formed in the shell at the interphase position of the adjacent screw sections; the tail end negative pressure cavity and the middle negative pressure cavity are each connected with a negative pressure connecting pipe. The multi-stage negative pressure valve has the advantages of being capable of providing multi-stage negative pressure and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic blister processing and relates to a multi-stage screw structure on a screw vacuum pump for plastic blister processing. Background Art

[0002] The blister processing is a process that uses negative pressure to drive the hot softened sheet to form a shape. The processing workshop often involves the processing of multiple products (even if it is a single product, there are two molds for the cover and the box). Because different products require different negative pressure strengths for molding, in conventional practice, each blister processing equipment has its own separate vacuum pump, so the equipment cost is relatively high. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-stage screw structure on a screw vacuum pump for plastic processing in view of the above-mentioned problems existing in the existing technology. The technical problem to be solved by the utility model is how to make the screw vacuum pump more widely used.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a multi-stage screw structure on a screw vacuum pump for blister processing, comprising a shell, a female rotor rotatably connected to the shell, and a male rotor meshing with the female screw, characterized in that the male rotor comprises a rotating shaft and a plurality of screw segments distributed alternately on the rotating shaft, with a spacing between adjacent screw segments, an exhaust chamber and an end negative pressure chamber respectively at both ends of the shell, and an intermediate negative pressure chamber is also provided on the shell at the alternate position of adjacent screw segments; the end negative pressure chamber and the intermediate negative pressure chamber are both connected to a negative pressure connecting pipe.

[0005] The present solution differs from the prior art in that the existing screw vacuum pump merely has air intake and exhaust at both ends of the shell, and negative pressure is formed at the air intake end, serving as a negative pressure gas source for vacuum forming processing under a single demand. In the present solution, the male rotor is no longer a continuous screw structure, but a segmented structure. A negative pressure forming area is formed between two adjacent sections of the multiple screw segments. That is to say, the present screw structure can provide multiple negative pressure gas sources with different negative pressure strengths, and can provide multiple negative pressure strength requirements according to needs. Multiple negative pressure pipes can be used as gas sources at the same time, or one can be used selectively. When used at the same time, the negative pressure pipes need to be connected in series with the voltage stabilizing structure and then connected to the negative pressure use end to avoid greater interference between each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a cross-sectional view of the screw structure.

[0007] In the figure, 1, shell; 2, female rotor; 3, screw section; 4, exhaust chamber; 5, end negative pressure chamber; 6, middle negative pressure chamber. DETAILED DESCRIPTION

[0008] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0009] like Figure 1 As shown, the multi-stage screw structure on the screw vacuum pump for blister processing includes a shell 1, a female rotor 2 rotatably connected to the shell 1, and a male rotor meshing with the female screw. The male rotor includes a rotating shaft and multiple screw segments 3 distributed alternately on the rotating shaft. There is a spacing between adjacent screw segments 3. The two ends of the shell 1 are respectively provided with an exhaust chamber 4 and an end negative pressure chamber 5. The shell 1 at the position between adjacent screw segments 3 is also provided with an intermediate negative pressure chamber 6; the end negative pressure chamber 5 and the intermediate negative pressure chamber 6 are both connected to a negative pressure pipe.

[0010] The present solution is different from the prior art in that the existing screw vacuum pump only has air intake and exhaust at both ends of the shell 1, and negative pressure is formed at the air intake end, which serves as a negative pressure gas source for vacuum forming processing under a single demand. In the present solution, the male rotor is no longer a continuous screw structure, but a segmented structure. A negative pressure forming area is formed between two adjacent sections of the multiple screw segments 3. That is to say, the present screw structure can provide multiple negative pressure gas sources with different negative pressure strengths, and can provide multiple negative pressure strength requirements according to needs. Multiple negative pressure pipes can be used as gas sources at the same time, or one can be used selectively. When used at the same time, the negative pressure pipes need to be connected in series with the voltage stabilizing structure and then connected to the negative pressure use end to avoid greater interference between each other.

[0011] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A multi-stage screw structure on a screw vacuum pump for blister processing, comprising a housing (1), a female rotor (2) rotatably connected to the housing (1), and a male rotor meshing with the female screw, characterized in that: The male rotor comprises a rotating shaft and a plurality of screw segments (3) distributed alternately on the rotating shaft, with a spacing between adjacent screw segments (3). The two ends of the housing (1) are respectively provided with an exhaust chamber (4) and a terminal negative pressure chamber (5), and the housing (1) at the position between adjacent screw segments (3) is also provided with an intermediate negative pressure chamber (6); the terminal negative pressure chamber (5) and the intermediate negative pressure chamber (6) are both connected to a negative pressure connecting pipe.

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