JPH0683977U - Vane type fluid machinery - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure smooth rotation of the rotor, suppress vibration and noise, reduce power loss, and extend bearing life. [Structure] A rotor 9 is arranged in a cylinder portion 4 of a casing 1 so as to be eccentric to the shaft of the cylinder portion, and a plurality of vanes 13 are mounted on the rotor 9 so as to be slidable in a radial direction.
In a vane type fluid machine in which 3 is supported by a float ring 15 housed in a recess 14 formed in both end faces of the rotor 9, an annular groove 20 is formed in a portion of the side wall of the casing 1 corresponding to the peripheral edge of the recess 14. A plurality of chambers in the recess 14 defined by the vanes 13 are communicated with each other through the annular groove 20, and the fluid in each chamber is circulated in accordance with the volume change of the chambers. Suppress the rise.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vane type fluid machine that performs a pumping action, a compressing action, and the like.

[0002]

[Prior art]

 Conventionally, a vane type fluid machine used as, for example, a hydraulic pump has a structure as shown in FIGS. In these drawings, reference numeral 1 denotes a casing composed of a cylindrical main body 2 and a pair of side plates 3 that close the openings at both ends of the main body 2, and a cylinder portion 4 is defined inside the casing 1, and Two pipe flanges 7 and 8 having a suction port 5 or a discharge port 6 communicating with the cylinder portion 4 are provided on the outer periphery of a main body 2 which constitutes the casing 1 and are separated from each other by 180 degrees. Reference numeral 9 denotes a rotor arranged in the cylinder portion 4 of the casing 1 so as to be eccentric to the shaft of the cylinder portion. The rotator 9 is rotatably supported on the boss by bearings 11 by extending the shafts 9a and 9b into a cylindrical boss 10 formed on the outer surface of the side plates 3 of the casing 1. Has been done. One shaft portion 9a of the rotor 9 is connected to a motor (not shown).

The rotor 9 is formed with grooves 12 extending in the axial direction and in the radial direction at positions at which the rotor 9 is evenly distributed in the circumferential direction (6 equally in this case). 13 is slidably fitted. On the other hand, recesses 14 having a predetermined depth are formed on both end surfaces of the rotor 9 so as to surround the shafts 9a and 9b, and each of the recesses 14 has a float ring 15 for supporting the base end of the vane 13. Is stored. The outer diameter d of the float ring 15 is a value obtained by subtracting twice the height h of the vane 13 from the diameter D of the cylinder portion 4 (d = D-2h). Is always in contact with the inner peripheral wall of the cylinder portion 4, and an independent chamber 16 is formed between the inner peripheral wall of the cylinder portion 4 and the outer periphery of the rotor 9 by each vane 13.

In the vane type fluid machine described above, when the rotor 9 is rotated as shown by an arrow a (FIG. 5) by the operation of a motor (not shown), each vane 13 has its tip on the inner peripheral wall of the cylinder portion 4. It rotates while making sliding contact, and accordingly, the volume of each chamber 16 between the inner peripheral wall of the cylinder portion 4 and the outer peripheral surface of the rotor 9 repeatedly expands and contracts, and the oil sucked from the suction port 5 during this period. Is ejected from the ejection port 6 by a predetermined amount.

[Problems to be solved by the device]

By the way, in the vane type fluid machine of this type, the float ring 15 is housed in the recesses 14 formed on both end surfaces of the rotor 9 without rattling. Therefore, the vertical wall of the recess 14 and the float ring 15 are accommodated. An independent chamber 17 is defined by the vanes 13 between the outer peripheral surface of the ring 15 (FIG. 5). Therefore, this chamber 17 also changes its volume in response to the rotation of the rotor 9, and the fluid (air) contained in each chamber 17 repeatedly expands and contracts in response to the rotation of the rotor 9. Positive pressure and negative pressure are alternately generated in each chamber 17, and as a result, not only the vibration noise accompanying the rotation of the rotor 9 is unavoidable but also the rotation resistance of the rotor 9 is increased. The reduction in the life of the bearing 11 due to the increase in power loss or the increase in load due to the load is unavoidable, and a countermeasure against it has been desired.

The present invention has been made in view of the above background, and an object of the present invention is to suppress the generation of vibration noise by ensuring smooth rotation of the rotor, and at the same time to reduce the power loss. (EN) Provided is a vane type fluid machine which achieves extension of bearing life.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a rotor in a cylinder portion in a casing having a suction port and a discharge port, the rotor being arranged eccentrically with respect to the axis of the cylinder portion, in the radial direction of the rotor. A plurality of vanes are mounted so as to be slidable in a radial direction, and the base ends of the vanes are supported in recesses formed on both end faces of the rotor and closed by the side wall faces of the casing. A vane type fluid machine comprising a float ring, the tip of which abuts against an inner peripheral wall of the cylinder portion, which is partitioned and formed by the vane in at least one of the casing, the rotor and the float ring. It is characterized in that a groove is formed so as to connect a plurality of chambers in the recess.

[0008]

[Action]

 In the vane type fluid machine configured as described above, since the chambers in the recess that accommodate the float ring and are defined by the vanes communicate with each other by the grooves, the chambers have a volume depending on the rotation of the rotor. Even if it changes, the fluid in each chamber flows through the grooves to each other, the positive pressure or the negative pressure generated in each chamber is suppressed to a small level, and the rotation of the rotor becomes smooth.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention. The present embodiment relates to a vane type fluid machine used as the hydraulic pump. The same parts as those shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted here. Let's decide. In the first embodiment, an annular groove 20 is formed in the inner surface of the two side plates 3 forming the casing 1 so as to face the recess 14. The groove 20 is provided along the peripheral edge of the recess 14 so as to communicate with all of the plurality of chambers 17 in the recess 14 defined by the vanes 13. The total volume of the chambers 17 is constant regardless of the rotation of the rotor 9.

In the vane type fluid machine configured as described above, even if the volume of each chamber 17 in the recess 14 changes according to the rotation of the rotor 9, the fluid in each chamber 17 passes through the annular groove 20. And distribute each other. That is, the fluid in the chamber 17 whose volume is constantly shrinking flows into the chamber 17 whose volume is constantly expanding through the annular groove 20. As a result, the positive pressure or the negative pressure generated in each chamber 17 is suppressed to be small, the rotation of the rotor 9 is made smooth, and thus the generation of vibration noise accompanying the rotation of the rotor 9 is suppressed, and the rotor 9 is also suppressed. The rotation resistance of bearing 9 is reduced to reduce power loss, and the load on bearing 11 is also reduced to extend its life.

FIG. 3 shows a second embodiment of the present invention. The feature of the second embodiment is that an annular groove 21 is provided at the bottom of the recess 14 of the rotor 9 instead of forming the annular groove 20 in the side plate 3 of the casing 1 in the first embodiment. It is in. According to the second embodiment, as in the first embodiment, the fluids in the chambers 17 flow through each other through the annular groove 21 according to the rotation of the rotor 9, so that the rotor 9 Rotation of the vane is smooth, and the annular groove 21 is located inside both sides of the vane 13.Therefore, the step of the annular groove 21 is not hit by the edge of the vane 13 and the safety is improved. improves.

In the above two embodiments, the annular grooves 20 and 21 are provided at the bottom of the side plate 3 of the casing 1 or the recess 14 of the rotor 9, but the present invention provides such grooves in the float ring 15. It is also good. In this case, it may be provided as a peripheral groove on the outer peripheral surface of the float ring 15, or an annular groove provided on the side surface of the float ring may be configured to communicate with the outer periphery of the float ring by radial grooves. Also, the chambers 17 defined by the vanes 13 in the recesses 14 are in communication with each other, and the rotor 9 rotates smoothly as in the above-described embodiments.

In addition, although the use as a hydraulic pump is shown in each of the above embodiments, the present invention can be used as a compressor, a blower, a hydraulic motor, a flow meter, etc., instead of being used as a hydraulic pump. Is also good.

[0015]

[Effect of device]

 As described above in detail, according to the vane type fluid machine according to the present invention, since the chambers in the recess accommodating the float ring are communicated with each other by the groove, the positive pressure generated in each chamber or Negative pressure is suppressed to a low level, the rotor rotates smoothly, and vibration noise due to rotor rotation is suppressed.In addition, the rotor's rotational resistance is reduced, which reduces dynamic loss and further reduces bearing loss. Such a load is reduced and the bearing life is extended, which has a great effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a vane type fluid machine which is a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view showing the structure of a vane type fluid machine according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a structure of a conventional vane type fluid machine.

5 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Casing 4 Cylinder part 5 Suction port 6 Discharge port 9 Rotor 11 Bearing 13 Vane 14 Recess 15 Float ring 20 Groove 21 Groove

Claims (1)

[Scope of utility model registration request] 1. A rotor is disposed in a cylinder portion in a casing having a suction port and a discharge port so as to be eccentric to the shaft of the cylinder portion, and a plurality of vanes are slidable in the rotor in the radial direction. The base end of each vane is supported in a recess formed radially on both end faces of the rotor and closed by the side wall faces of the casing, and the tip end of each vane contacts the inner peripheral wall of the cylinder part. In a vane type fluid machine accommodating a float ring to be contacted, at least one of the casing, the rotor and the float ring,
A vane type fluid machine characterized in that a groove communicating with a plurality of chambers in the recess formed by the vane is formed.