RU81776U1 - VACUUM PUMP VALVE PUMP - Google Patents

Abstract

A rotary vane vacuum pump comprising a housing with end caps and windows for supplying and discharging a working medium, an rotor eccentrically located in the housing with grooves and plates placed therein. Each plate is made integral and consists of two equal parts in length. The windows for supplying and discharging the working medium have jumpers in the middle, dividing them into two sickle-shaped halves, while the jumpers are located in the direction of rotation of the rotor.

Description

The utility model relates to vacuum engineering, in particular to mechanical vacuum pumps and can be used in the metallurgical industry, in the foundry for pumping hot air from the molds of injection molding machines.

A known vacuum pump (RU 1587227, F04C 18/00), comprising a housing with end caps, on the inner surface of which ring grooves are made, a rotor with radial grooves eccentrically mounted in the housing. Plates are placed in radial grooves with the formation of working chambers. The pump is equipped with pins mounted on the plates with the ability to move in the annular grooves of the end caps. At the time of start-up, when there are no centrifugal forces, the plates are displaced from the rotor slots due to pins sliding in the grooves of the covers, including the possibility of jamming of the plates. The known pump reliably works by eliminating the likelihood of jamming of the plates at relatively low temperatures of the pumped air. The disadvantage of this pump is the inability to use it for pumping out very hot air. When pumping out very hot air from the cavity of the molds of injection molding machines, strong warping and bending of the plates are possible, which leads to their jamming in the grooves of the rotor and the load on the pins is greatly increased and breakage is not excluded. With a length of more than 420 mm, even small warpage and bending lead to a sharp increase in the load on the pins.

The proposed utility model aims to create a reliable

rotary vane vacuum pump used for pumping hot air from the mold cavity of injection molding machines.

To solve this problem, a rotary vane vacuum pump is proposed, comprising a housing with end caps and windows for supplying and discharging a working medium, a rotor eccentrically located in the housing with grooves and plates placed in them. Each plate is made integral and consists of two equal parts in length. The windows for supplying and discharging the working medium have jumpers in the middle, dividing them into two sickle-shaped halves, while the jumpers are located in the direction of rotation of the rotor.

Gaps between pump connections are oil sealed. Each plate is made integral and consists of two equal parts in length. The implementation of the plates of two equal in length parts allows to halve the bending and warping of the plates, since the bending and warping of each of the two parts of the plate is not cumulative. The likelihood of jamming of the plates in the grooves of the rotor is reduced and due to this increases the reliability of the pump.

The presence of jumpers on the windows for supplying and discharging the working medium located in the direction of rotation of the rotor prevents the plates from skewing, since when the plates pass through the windows for supplying and discharging the working medium, the ends of the plates facing the windows are supported by jumpers.

Figure 1 shows a longitudinal section of the proposed pump;

figure 2 is a section aa in figure 1;

figure 3 is a view of B in figure 2.

The rotary vane vacuum pump comprises a cylindrical housing 1 closed with ends by end caps 2 and

3. In the housing 1, an rotor 4 is eccentrically mounted in radial grooves 5 of which are mounted plates 6 made of a material with a low coefficient of friction, for example, PCB. Moreover, the plates 6 are made integral and consist of two equal parts in length. The inlet and outlet windows 7 and 8 are equipped with jumpers 9, which are located in the direction of rotation of the rotor 4.

The rotary vane vacuum pump operates as follows. When the rotor 4 is rotated, its plates 6 make reciprocating movements in the radial grooves 5, being in constant contact with the housing 1. The plates 6 divide the working cavity of the pump into chambers 10 of variable volume. At the beginning of the cycle, the volume of the chamber 10 increases to the maximum value (at the end of the suction), then decreases, providing the process of gas compression to the corresponding discharge pressure. The gas is exhausted through the exhaust port 8. Due to the fact that the plates 6 are made of two equal parts in length when hot air is pumped out from the mold cavity of injection molding machines, there is a twofold decrease in warping and bending of the plates 6. And this in turn reduces the likelihood of jamming of the plates 6 in the grooves 5 of the rotor 4, thereby increasing the reliability of the pump.

The plates 6, when passing through the inlet and outlet windows 7 and 8 with their ends facing the windows, also rely on jumpers 9, thereby reducing the likelihood of skewing of the plates 6 and increasing the reliability of the pump. Sealing the gap between the housing 1 and the plates 6, as well as between the caps 2 and 3 and the end face of the rotor 4 is carried out by oil, which is sucked from the oil cylinder installed on the suction line through a needle adjustable valve (not shown). The same oil serves as a lubricant for the working cavity. For one revolution of the rotor 4 four work cycles are performed.

Claims (1)

A rotary vane vacuum pump containing a housing with end caps and windows for supplying and discharging a working medium, an rotor eccentrically located in the housing with grooves and plates placed in them, characterized in that each plate is made integral and consists of two parts, equal in length, except Moreover, the windows for supplying and discharging the working medium have jumpers in the middle, dividing them into two sickle-shaped halves, while the jumpers are located in the direction of rotation of the rotor.