JPH0557386U - Fluid machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] Vibration and noise can be suppressed by providing a reinforcing material between the legs that support the casing. [Structure] Inside the casing 2, two rotors 3 and 4 are provided.
Are mounted so as to be out of phase with each other.
In the fluid machine 1 in which 4 are rotatable in opposite directions by synchronous gears 7 and 8 provided at the ends of the shafts 5 and 6 of the rotors 3 and 4, respectively, a discharge port 10 of the casing 2 is provided.
Both side wall portions 10a, 10b are extended in parallel to form paired legs 11, 12 for supporting the casing 2,
The space C between the two legs 11 and 12 is characterized by being provided with a reinforcing member 13 for attenuating vibration and noise during fluid pressure feeding.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 This invention relates to a fluid machine such as a roots blower.

[0002]

[Prior Art]

 Generally, a roots-type fluid machine is used for pumping air and light gas with a low specific gravity or for vacuuming.In this fluid machine, two rotors mounted in a casing with a phase difference from each other are used. The fluid such as air sucked from the suction port of the casing was rotated along with the synchronous gears attached to the shafts, moved along the inner wall of the casing, and was then discharged from the discharge port facing the suction port.

[0003]

[Problems to be solved by the device]

 However, since the fluid passing through the inside of the fluid machine is alternately sent out from the discharge ports by the rotors, vibration and noise due to pressure pulsation occur on the discharge side of the fluid machine.

This has a problem that the longer the operating time of the fluid machine is, the worse the working environment is, and the production efficiency is significantly affected.

In view of the above conventional circumstances, the present invention aims to provide a fluid machine capable of suppressing vibration and noise with a simple structure.

[0006]

[Means for Solving the Problems]

 In the fluid machine of the present invention, two rotors are mounted inside a casing so that the rotors are out of phase with each other, and the respective rotors can rotate in opposite directions by a synchronous gear provided at the shaft end of each rotor. In the fluid machine described above, both side walls of the discharge port of the casing are extended in parallel to form a pair of legs that support the casing. It is provided with a reinforcing material to attenuate noise.

[0007]

[Action]

 When the two rotors rotate in opposite directions by the activation of the driving means (not shown), the fluid on the suction port side moves between each rotor and the inner wall of the casing and is pumped from the discharge port.

At this time, vibration and noise are generated by pressure pulsation of the fluid alternately sent out by each rotor, and even if the vibration and noise propagate to the casing, the vibration and noise are significantly attenuated by the reinforcing material. It

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

A fluid machine 1 shown in FIGS. 1 and 2 is a roots-type blower that pumps fluid such as air and gas, and includes a casing 2, rotors 3, 4, a driven shaft 5, a drive shaft 6, and the like. The gears 7 and 8, the suction port 9, the discharge port 10, the legs 11 and 12, and the reinforcing member 13 are main components.

That is, two rotors 3 and 4 are mounted inside the casing 2 with their phases shifted by 90 ° (in the case of a two-leaf rotor), and the rotors 3 and 4 are driven by the rotor 3 fixed to each other. Synchronous gears 7 and 8 provided at the shaft ends of the shaft 5 and the drive shaft 6 fixed to the rotor 4 are rotatable in opposite directions, and the drive shaft 6 has a driving means such as a motor. (Not shown) are connected.

Both side wall portions 10 a and 10 b of the discharge port 10 of the casing 2 are extended downward in parallel to form paired leg bodies 11 and 12 for supporting the casing 2, and between the both leg bodies 11 and 12. A reinforcing material 13 is provided in the empty space C.

The reinforcing material 13 is for attenuating vibration and noise generated when the fluid is pressure-fed, and its forming process is integrally molding with both legs 11 and 12 when the casing 2 is cast, or separately molded. Either one of inserting the reinforcing material 13 between the legs 11 and 12 and fixing the reinforcing material 13 is selected.

Next, the operation of the above embodiment will be described.

When the two rotors 3 and 4 rotate in mutually opposite directions due to the activation of drive means (not shown), the fluid on the suction port 9 side moves between each rotor 3 and 4 and the inner wall of the casing 2. Then, it is pressure-fed from the discharge port 10.

At this time, even if vibration and noise generated by pressure pulsation of the fluid alternately sent out by the rotors 3 and 4 propagate to the casing 2, this vibration and noise are significantly attenuated by the reinforcing member 13. To be done.

By the way, when the applicant conducted an experimental measurement of the damping function of the reinforcing material 13, it was found that the reinforcing material 13 of the present invention was provided as compared with the conventional case without the reinforcing material 13 (see FIG. 3). (See FIG. 4) gave very favorable results.

[0018]

[Effect of the device]

 In the fluid machine of the present invention, both side walls of the discharge port of the casing are extended in parallel to form a leg for supporting the casing, and the space between the two legs forms vibration and noise during fluid pressure feeding. Since a reinforcing material is provided to reduce the energy consumption, even if the fluid machine is operated for a long period of time, there is no risk of deteriorating the working environment, thus significantly improving the production efficiency. It has excellent advantages.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fluid machine.

FIG. 2 is a right side view of the fluid machine.

FIG. 3 is a diagram showing vibration and noise measurement results in a conventional example.

FIG. 4 is a diagram showing measurement results of vibration and noise in the present invention.

[Explanation of symbols]

 1 Fluid Machine 2 Casing 3,4 Rotor 5 Driven Shaft 6 Drive Shaft 7 and 8 Synchronous Gear 10 Discharge Ports 10a and 10b Side Walls 11 and 12 Legs 13 Reinforcement C Void

Claims (1)

[Scope of utility model registration request] 1. A fluid machine in which two rotors are mounted in a casing with their phases shifted from each other, and the respective rotors are rotatable in opposite directions by a synchronous gear provided at the shaft end of each rotor. In the above, both side walls of the discharge port of the casing are extended in parallel to form a pair of legs that support the casing, and a space between the legs is provided for damping vibration and noise during fluid pressure feeding. A fluid machine characterized in that a reinforcing material for performing the operation is provided.