JPH04134687U - axial compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To have a simple structure, good compression efficiency, and to reduce vibration and noise. [Configuration] Screw blades 22 are installed on the outer peripheral surface of the rotating shaft 21.
A screw shaft 2 is formed in which the screw blades 22 are continuously formed in a spiral shape. The spiral space 3 formed in the cylindrical casing 1 is formed so that its volume gradually decreases from the suction port 11 side to the discharge port 12 side.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on axial flow compression, which is mainly used in refrigeration cycles such as refrigerators and air conditioners. Regarding machines.

0002

[Conventional technology]

Conventional compressors compress and send out gas using the reciprocating motion of a piston. The gas is compressed by rotating the rotor to reduce the volume of the chamber. A propeller that sends out a rotary type or has a ship or aircraft propeller attached to the rotating shaft. Various types are known, such as an axial flow type in which the shaft is installed inside a cylindrical casing. Ru.

0003

[Problem that the idea aims to solve]

However, the above-mentioned reciprocating and rotary compressors have complicated structures and generate vibration and noise. There were problems with sound, and since axial flow compressors use a propeller shaft, The compression action is similar to that of a blower, and uses the air force, and in the case of large capacity, Although it is suitable, the compression efficiency is poor, and the wind noise caused by the propeller and propeller There was a problem that vibration occurred due to the rotation of the roller.

0004 This invention focuses on the conventional problems mentioned above, and has a simple structure and high compression efficiency. Our objective is to provide an axial flow compressor that can reduce vibration and noise. It is said that

[0005]

[Means to solve the problem]

In order to solve the above problems, the axial flow compressor of this invention has a suction port formed at one end. a cylindrical casing with a discharge port formed at the other end; A screw shaft is provided inside the screw shaft, and the screw blade of the screw shaft is provided with: The rotating shaft is in a state where its outer periphery maintains airtightness between it and the inner peripheral surface of the cylindrical casing. is continuously formed in a spiral shape on the outer peripheral surface of the cylindrical casing by the screw shaft. The spiral space formed inside the housing gradually increases in volume from the suction port side to the discharge port side. The structure is such that the diameter is small.

[0006]

[Effect]

In the axial flow compressor of this invention, when the screw shaft rotates, gas flows from the suction port into the cylinder. It is sucked into the casing, and as the screw shaft rotates, the spiral space is directed toward the discharge port. Sent. In this case, the screw blade of the screw shaft has an outer circumference of the circular shape. It maintains airtightness between the inner peripheral surface of the cylindrical casing and the outer peripheral surface of the rotating shaft in a spiral shape. Since it is formed continuously, there is a gap between the screw blade and the inner peripheral surface of the cylindrical casing. No gas leaks from the

[0007] The volume of the spiral space gradually decreases from the suction port side to the discharge port side. The gas is gradually compressed as it is sent towards the discharge port. Then, it is sent out from the discharge port while being compressed.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 shows axial flow compression according to an embodiment of the present invention. This axial flow compressor is equipped with a cylindrical casing 1 and a screw shaft 2. ing.

[0009] The cylindrical casing 1 has an inlet port 11 formed at one end and a discharge port at the other end. 12 is formed, and the diameter gradually becomes smaller from the suction port 11 side to the discharge port 12 side. It is formed into a tapered cylinder.

0010 The screw shaft 2 has screw blades 22 spirally arranged on the outer peripheral surface of the rotating shaft 21. The rotating shaft 21 has both ends supported by the cylindrical casing 1. By doing so, it is provided inside the cylindrical casing 1. Furthermore, this screen The screw shaft 2 is rotationally driven by a motor (not shown).

[0011] The screw blade 22 has an outer circumference that is similar to the inner circumferential surface 13 of the cylindrical casing 1. The seal structure in this case is shown in Figure 2. Insert the seal string 24 into the groove 23 formed along the outer periphery of the screw blade 22 so that the The fitted structure is formed along the outer periphery of the screw blade 22, as shown in FIG. A sealing plate 26 is slidably fitted inside the groove 25, and this sealing plate 26 is inserted into the spout. A structure in which the ring 27 is biased outward may be used.

0012 Since the cylindrical casing 1 is formed into a tapered tube as described above, A helical space 3 formed in the cylindrical casing 1 by the screw shaft 2 serves as a suction It is formed so that the volume gradually decreases from the inlet 11 side to the discharge port 12 side. There is.

[0013] In addition, as a means to gradually reduce the volume of the spiral space 3, the screw blade 22 is The pitch is formed so that it gradually becomes smaller from the suction port 11 side to the discharge port 12 side. It is also possible to reduce this pitch and change the cylindrical casing 1 to a tapered tube. It may also be possible to combine forming.

[0014] Next, the operation of the embodiment will be explained. In the axial flow compressor of this embodiment, when the screw shaft 2 is rotated, the suction port 11 Gas is sucked into the cylindrical casing 1, and as the screw shaft 2 rotates, it flows into the helical space 3. is sent toward the discharge port 12. In this case, the outer circumference of the screw blade 22 is While maintaining airtightness between the inner circumferential surface 13 of the cylindrical casing 1 and the rotating shaft 21 Since it is continuously formed in a spiral shape on the outer peripheral surface of the screw blade 22 and the cylinder, There is no gap between the inner circumferential surface 13 of the casing 1 and no gas leaks.

[0015] The volume of the spiral space 3 gradually decreases from the suction port 11 side to the discharge port 12 side. Since the gas is formed so as to be narrower, the gas is sent toward the discharge port 12 and then It is first compressed and then sent out from the discharge port 12 while being compressed.

[0016] Therefore, in the axial flow compressor of this embodiment, by gradually reducing the volume, Since the gas is compressed through There is no wind noise or vibration.

[0017]

[Effect of the idea]

As explained above, the axial flow compressor of the present invention has a simple structure and The reduction efficiency is good, and the effect of reducing vibration and noise can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an axial flow compressor according to an example.

FIG. 2 is a sectional view showing an example of a seal structure between a screw blade and a cylindrical casing of the axial compressor.

FIG. 3 is a sectional view showing an example of a seal structure between a screw blade and a cylindrical casing of the axial compressor.

[Explanation of symbols]

1 Cylindrical casing 11 Inlet 12 Discharge port 13 Inner peripheral surface 2 Screw shaft 21 Rotation axis 22 Screw blade 3 Spiral space

Claims (1)

[Scope of utility model registration request] 1. A cylindrical casing having an inlet formed at one end and a discharge port formed at the other end, and a screw shaft provided inside the cylindrical casing, the screw blade of the screw shaft comprising: a spiral space formed continuously in a spiral shape on the outer circumferential surface of the rotating shaft with the outer circumference maintaining airtightness between the outer circumference and the inner circumferential surface of the cylindrical casing, and formed in the cylindrical casing by the screw shaft; An axial flow compressor characterized in that the volume is gradually reduced from the suction port side to the discharge port side.