JPH04103283U - fluid machinery - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to avoid a temperature rise inside the casing and to improve the heat dissipation effect inside the bearing chamber. [Structure] A ventilation port that communicates between the bearing chamber and the outside air, and a communication port that communicates between the inside of the casing and the bearing chamber are formed. As a result, a portion of the high-temperature air in the casing is flowed into the bearing chamber to avoid a rise in temperature, and at the same time, convection is generated within the bearing chamber to release heat within the bearing chamber through the ventilation port.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea was developed for use with roots blowers for aeration during water treatment, for example. Regarding fluid machinery such as equipment.

0002

[Conventional technology]

In fluid machines such as Roots blowers, two rotors are housed in a casing. As the rotor rotates, fluid such as air is compressed and expanded between the rotors, and the air is sucked into the casing through the suction port and discharged through the discharge port. I try to do that.

0003

[Problem that the idea aims to solve]

In such fluid machines, air is compressed within the casing, causing the casing to Thing's temperature rises. Furthermore, this heat is transmitted to the casing through the rotor's rotating shaft, etc. The temperature of the bearing is transmitted to the bearing chamber on the side of the bearing, causing the temperature of the bearing to rise, causing the oil disposed in the bearing to rise. Also, there was a problem that the temperature of the grease or the like was increased, causing seizure or the like.

0004 This idea solves the above-mentioned problems of the conventional technology and avoids temperature rise inside the casing. The purpose is to provide a fluid machine that can improve the heat dissipation effect of the bearing part. do.

[0005]

[Means to solve the problem]

This idea is designed to be installed inside the casing, which has an inlet and an outlet. The rotor is accommodated, and the rotation axis of the rotor passes through the wall of the casing. The rotor is rotatably supported by a bearing in a bearing chamber, and fluid is supplied by rotation of the rotor. is sucked into the casing from the suction port and discharged from the discharge port. In order to achieve the above purpose, the peripheral wall of the bearing chamber is connected to outside air. A ventilation hole is formed in the wall of the casing to communicate with the bearing chamber. It forms a communication port.

[0006]

[Effect]

In the fluid machine of this invention, a ventilation hole is formed in the peripheral wall of the bearing chamber to communicate with the outside air. At the same time, we decided to form a communication port in the wall of the casing that communicates with the bearing chamber. As a result, some of the high-temperature air compressed inside the casing enters the bearing chamber through the communication port. At the same time, the air flowing into the bearing chamber creates convection inside the bearing chamber, causing the shaft to Heat in the receiving room is efficiently released through the ventilation opening.

[0007]

【Example】

Figure 1 is a perspective view showing a fluid machine such as a Roots blower device, which is an embodiment of this invention. It is. As shown in the figure, in this Roots blower device, air is supplied to the upper part of the suction pipe 50. It is configured so that it is sucked into the casing 1 and discharged from the discharge pipe 60. Ru.

[0008] 2 shows a sectional view taken along the line AA in FIG. 1, and FIG. 3 shows a sectional view taken along the line BB in FIG. Shown in both figures As shown, the casing 1 includes a substantially cylindrical casing side wall portion 2 and Plate portions 3a and 4 of bearing members 3 and 4 respectively closing both end openings of wall portion 2; a (the wall of the casing). On the casing side wall 2, there are A suction port 5 and a discharge port 6 are formed to face each other, The suction pipe 50 (see FIG. 1) is connected to the suction port 5, and the above-mentioned pipe is connected to the discharge port 6. A discharge pipe 60 (see FIG. 1) is connected.

[0009] The bearing members 3 and 4 are integrally provided on one side of the plate portions 3a and 4a, respectively. It has substantially cylindrical side wall portions 3b and 4b. The bearing members 3 and 4 are each molded. It is formed by machining, and there are cast holes (ventilation holes) 3c in the side walls 3b and 4b during molding. , 4c are formed respectively.

0010 On the other hand, the two rotors 7 and 8 each have three rotors on their outer periphery, as shown in FIG. Twisted grooves 7a, 8a are formed. Both rotation shafts 7b, 8 of both rotors 7, 8 b are arranged in parallel in the same horizontal plane, and both rotors 7 and 8 are out of phase with each other. are fitted into the casing 1 as shown in Figures 2 and 3. be tolerated. Further, both rotating shafts 7b, 8b are connected to plate portions 3a, 4 of bearing members 3, 4. Bearings 9 and 9 are respectively inserted into the side wall portions 3b and 4b of the bearing members 3 and 4 by penetrating through the a. 10, each of which is rotatably supported.

[0011] A communication port 13 is formed in the plate portion 3a of the bearing member 3 on one side, and An oil stopper 11 is attached to the tip of the side wall 3b of the bearing member 3. to this Thus, a bearing chamber 12 is formed surrounded by the oil stopper 11 and the bearing member 3, The inside of the bearing chamber 12 is communicated with the outside air via the ventilation port 3c, and the bearing chamber 12 The interior of the casing 1 is communicated with the interior of the casing 1 through a communication port 13.

0012 Also, it penetrates the oil stopper 11 and pulls to one side of the oil stopper 11. A gear 14 that meshes with each other is provided at one end side of each of the two rotating shafts 7b and 8b. , 14 are attached. Further, a bearing member is installed so as to cover both gears 14, 14. A gear case 15 is attached to the tip of the side wall portion 3b of No. 3.

[0013] A communication port 23 is formed in the plate portion 4a of the bearing member 4 on the other side, and A bearing cover 20 is attached to the tip of the side wall 4b of the bearing member 4. this As a result, a bearing chamber 22 is formed surrounded by the bearing cover 20 and the bearing member 4. The inside of the bearing chamber 22 is communicated with the outside air through the ventilation port 4c, and the bearing chamber 22 and the inside of the casing 1 are communicated via the communication port 23.

[0014] The other end of the rotating shaft 7b on one side passes through the bearing cover 20 and is placed outside. be done. Furthermore, the other end side of the rotating shaft 7b is the rotational drive of the motor 70 (see FIG. 1). It is connected to the shaft via a power transmission mechanism 80 (see FIG. 1) such as a pulley or belt.

[0015] In this Roots blower device, when the motor 70 is rotationally driven, the power transmission mechanism The rotating shaft 7b on one side rotates via the gear 80, and the rotating shaft 7b rotates on the other side via the gears 14, 14. The rotating shaft 8b on one side rotates in opposition to the rotating shaft 7b on one side. In this way, one The rotor 7 on one side rotates counterclockwise in FIG. 3, and the rotor 8 on the other side rotates in the same direction. Rotate clockwise. This allows external air to flow into the suction pipe 50 (see Figure 1) and The air is sucked into the casing 1 through the suction port 5, and the air is rotated by the rotors 7 and 8. After being continuously fed to the discharge port 6 side along the twisted grooves 7a and 8a, the discharge It is discharged to the outside through a tube 60 (see FIG. 1).

[0016] During the operation of this Roots blower device, the high temperature air compressed within the casing 1 is A portion flows into the bearing chambers 12, 22 through the communication ports 13, 23, and flows into the casing 1. temperature rise is suppressed. Furthermore, due to the air flowing into the bearing chambers 12 and 22, Convection occurs within the bearing chambers 12 and 22, and the air within the bearing chambers 12 and 22 and the outside air are connected to each other through the ventilation opening. Ventilation is provided through 3c and 4c. This ventilation reduces the heat inside the bearing chambers 12 and 22. The temperature of grease, oil, etc. disposed in the bearings is rapidly released to the outside. This prevents build-up and prevents burn-in and the like.

[0017] For reference, when we compared a prototype machine based on this idea with a conventional machine, we found that When the discharge pressure at the outlet is 0.5 kgf per square centimeter, the prototype machine Although the air volume was slightly reduced (4.7%) compared to the conventional machine, the temperature of the bearing section was approximately We were able to reduce the noise by 8 degrees.

[0018] In the above embodiment, the rotors 7 and 8 are provided with twisted grooves 7a and 8b. Although we have explained the helical type roots blower device, it is not limited to that. , a spar type roots block in which linear grooves are formed along the axial direction on the rotors 7 and 8. It can also be applied to equipment.

[0019]

[Effect of the idea]

As described above, according to the fluid machine of this invention, the peripheral wall of the bearing chamber communicates with the outside air. In addition to forming a ventilation hole, a communication hole that communicates with the bearing chamber is formed in the wall of the casing. Because of this, some of the high temperature air compressed inside the casing passes through the communication port. It flows into the bearing chamber and prevents the temperature rise in the casing, and the The air flowing in creates convection within the bearing chamber, and the heat inside the bearing chamber is released through the ventilation openings. It is possible to obtain the effect that the heat is efficiently released and the heat dissipation effect of the bearing section is also enhanced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a fluid machine that is an embodiment of this invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a perspective view showing a rotor applied to the above embodiment.

[Explanation of symbols]

1 Casing 3c, 4c ventilation opening 5 Inlet 6 Discharge port 7,8 Rotor 7b, 8b rotation axis 9,10 Bearing 12, 22 Bearing chamber 13, 23 Communication port

Claims (1)

[Scope of utility model registration request] 1. A rotor is housed inside a casing in which a suction port and a discharge port are respectively formed, and a rotating shaft of the rotor passes through a wall of the casing and is rotatably supported by a bearing within a bearing chamber. In the fluid machine, in which fluid is sucked into the casing through the suction port and discharged from the discharge port by rotation of the rotor, a ventilation port communicating with outside air is formed in the peripheral wall of the bearing chamber; . A fluid machine, characterized in that a wall of the casing is provided with a communication port that communicates with the inside of the bearing chamber.