RU2480626C1 - Rotary vacuum pump of hose type - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: pump includes a housing with outlet branch pipes and an inlet branch pipe: in side cover plate, elastic hoses, a rotor with rollers contacting the elastic chamber and device for adjustment of compression degree of elastic hoses with each roller. The pump housing has three sections representing independent devices for receiving negative pressure created with vacuum of different depth. Each of those sections provides the operation of different assemblies of the milking machine. The elastic hose located in the first pump section performs air intake in the pump stator cavity, and connection to the vacuum system is performed through the connection pipe with a check valve in the pump cover plate. Inner cavity of the second section is connected to inner cavity of the first section by means of a bypass valve. Negative pressure degree created with vacuum in the pump sections, passage through the bypass valve in partitions between sections is reduced to the value that is required for operation of a milk pipeline and a vacuum pipeline. Degree of vacuum negative pressure in the pump sections corresponds to negative pressure value obtained in each pump section and controlled due to action of bypass valves.

EFFECT: when using the described pump, pressure inside and outside the hose located in the pump sections is equalised, which allows using an elastic hose with wall thickness that is smaller than that in similar designs; increasing the supply, reducing the power costs for movement of rollers and enlarging the service life of elastic chambers.

2 cl, 2 dwg

Description

A peristaltic pump is known, consisting of a housing, an elastic pump chamber in the form of a tube with reinforcing coils wound thereon, a drive shaft inside the housing with brackets and pressure rollers in contact with the pump tube, and adjusting bolts for adjusting the clamping force of the hose (GB 1528893, F04C 5/00).

To reduce friction and wear, rubbing parts and the tube can be immersed in glycerin.

The disadvantage of this pump is the low flow rate, the limited service life of the flexible hoses and it provides only one vacuum level created by the vacuum.

Known rotational vacuum pump of a hose type, comprising a housing with exhaust pipes and an inlet pipe in the side cover of the pump, several elastic chambers on its inner surface, a rotor with rollers in contact with the elastic chambers, and a device for adjusting the compression ratio of the elastic chambers with each roller. The internal cavity of the pump housing is sealed, in addition, the intake is carried out from a recess in the pump housing on its inner surface, and the elastic chamber is made in the form of two elastic rubber rings located one above the other and the annular space formed between them, while air is drawn into the elastic shells through the nozzles and tubes attached to the side cover of the pump opposite from the cover with the suction pipe, a check valve is installed on the fitting of the side cover and on the rotor It sets at least one roller, and a condensate pump is provided with a release valve (RU 88748 U1, 20.11.2009)

The disadvantage of this pump is that it provides a vacuum created by a vacuum of one level.

The task set in the present invention, and the technical result of the invention is to increase the pump flow and the life of the elastic chambers, as well as providing several values of the level of vacuum formed by the vacuum in the pump casing.

The task and technical result are achieved in that in a rotary vacuum pump of a hose type, comprising a housing with exhaust pipes and an inlet pipe in the side cover of the pump, elastic chambers on its inner surface, a rotor with rotors in contact with the elastic chambers, a device for adjusting the compression ratio elastic chambers with each roller, the pump casing has three sections isolated by partitions, which are autonomous devices for obtaining a vacuum of different sizes.

In addition, bypass valves for regulating the level of rarefaction in these sections are installed in the partitions of the sections.

In Fig.1 shows a diagram of a rotational vacuum pump of a hose type, in Fig.2 - section BB of Fig.1.

A hose-type rotary vacuum pump consists of a housing 1, divided by partitions 2 into 3 sections 3, 4, 5, an elastic chamber 6, mounted on the inner surface of each pump section, a rotor 7, mounted on the drive shaft 8, and rollers 9. The roller 9 is located on the axis 10 of the carriage 11, hinged at one end on the lever 12 of the rotor 7, and the other to the screw 13 with a compression spring 14 having a washer 15 and a nut 16 for adjusting the compression ratio of the elastic chamber 6 by the roller 9. A fitting 17 is installed in the side cover the connection of the first section of the housing Sos to a vacuum system. Bypass valves 18 are used to adjust the vacuum level in the pump sections. A safety valve 19 is used to control the vacuum level.

Each of sections 3, 4, 5 of the pump provides the operation of various units of the milking unit. An elastic chamber 6, located in the first section 3 of the pump, carries out air intake in the cavity of the stator of the pump, and connection to the vacuum system is via a fitting 17 with a check valve in the side cover of the pump. The inner cavity of the second section 4 is connected to the inner cavity of the first section 3 by the bypass valve 18. Accordingly, the vacuum created by the vacuum in the first section 3 of the pump, passing through the bypass valve 18 in the partition 2 between sections 3 and 4, is reduced to the value necessary for operation milk pipeline. Similarly, the inner cavity of the third section 5 is connected to the inner cavity of the second section 4. Accordingly, the degree of vacuum created by the vacuum in the second section 4 of the pump, passing through the bypass valve 18 in the partition 2 between sections 4 and 5, is reduced to the value necessary for the operation of the vacuum wire . Thus, the vacuum rarefaction in sections 3, 4, 5 of the pump corresponds to the amount of vacuum obtained in each section of the pump, and is regulated by the action of the bypass valves 18. When using this pump, the pressure inside and outside the elastic chamber 6 located in sections 3, 4, 5 of the pump is leveled, which allows the use of an elastic chamber with a wall thickness less than in similar structures.

The proposed rotational vacuum pump is a hose type as follows. The roller 9 under the action of the spring 14 compresses the elastic chamber, which divides, in combination with the pressing of the chamber by the second roller, the cavity of the elastic chamber 6 into two parts.

The elastic chambers 6 are fixed sequentially one after another inside the sections 3, 4, 5 of the pump housing 1. The elastic chamber 6 in the first section carries out air intake inside the pump casing 1, which simultaneously plays the role of a vacuum cylinder to equalize the pressure inside and outside the casing.

When the rotor 7 rotates, the rollers 9 roll along the surface of the elastic hose 6, alternately and tightly pinching it in place of its contact with the roller 9. Moreover, as the roller 9 is rotated (in FIG. 1 counterclockwise), the volume of the cavity portion of the elastic hose 6 is behind the roller 9 increases and gas is sucked into it, at the same time, the volume of part of the elastic chamber 2 in front of the roller 9 decreases, removing air from the system.

Next, the roller 9, compressing the elastic hose, rolls into the area of the suction hole, passes it, again the hose 6 is divided by the roller 9 into two parts, and the processes are repeated with a given speed of rotation of the rotor 7.

During operation, the vacuum from section 3 of the pump, connected by the nozzle 17 to the vacuum system of the milking unit and having the largest value, is distributed through the bypass valves 18 installed in the partitions 2, decreasing to those vacuum values that are necessary for the operation of the milk pipe and the vacuum wire milking unit.

The rolling of the roller 9 over the surface of an elastic hose 6 with thin walls significantly reduces its friction force on the surface of this hose, reduces its heating, increases the service life of deformable pump parts and facilitates compression. The absence of a pressure difference in the hose and out of it contributes to its straightening, the forces of the internal resistance of the chamber material are reduced. All this provides a significant reduction in energy consumption for the pump drive, and an increase in the working cavity of the elastic chamber, in comparison with the elastic chambers of known volumetric pumps, can significantly increase its supply.

Claims (2)

1. A rotational vacuum pump of a hose type, comprising a housing with exhaust pipes and an inlet pipe in the side cover of the pump, elastic chambers on its inner surface, a rotor with rollers in contact with elastic chambers, a device for adjusting the compression ratio of elastic chambers with each roller, characterized in that the pump casing is divided by partitions into three isolated sections, which are self-contained devices for creating a vacuum of different sizes. 2. The rotational vacuum pump of the hose type according to claim 1, characterized in that bypass valves for adjusting the level of rarefaction in these sections are installed in the partition walls.

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