JPH0733840B2 - Compressor device - Google Patents

Description

The present invention relates to a compressor device for compressing a fluid such as air.

[Conventional technology]

Conventionally, a compressor device such as a cooling device mounted in an automobile or the like has two opposed air compression surfaces fitted in a scroll shape, one compression surface is fixed, and the other compression surface is in an involute diagram. It is designed to rotate out of phase. Then, air is taken in from the outer peripheral portion of the scroll and compressed and transferred to the central portion of the scroll.

However, in the conventional compressor device described above,
Precision of the dimensions and surface roughness of the two facing scroll tooth surfaces is required, and high airtightness is required. In addition, these scroll teeth require close contact and friction,
Consideration should be given to the hardness and wear resistance of the material.
Therefore, the conventional compressor device cannot be made lightweight or compact. In addition, there is a problem that it is difficult to improve efficiency and it is difficult to prevent generation of vibration and noise due to the limitation of the size of the device.

Further, as a conventional compressor device, a compressor device of a type in which a screw formed by gradually reducing the pitch of a spiral of a screw thread is rotationally driven in a cylinder is disclosed in Japanese Utility Model Publication No. 60-147797. .

[Problems to be Solved by the Invention]

However, in the compressor device of the type described in the above-mentioned Japanese Utility Model Laid-Open No. 60-147797, the work of manufacturing the screw is troublesome and there is a problem in space efficiency.

Therefore, in order to solve the above problems, the present invention is a compressor device of a type in which a screw is driven to rotate in a cylinder, in which the screw manufacturing and adjustment work is easy, and the compressor device is improved in terms of space efficiency. Is intended to provide.

[Means for Solving the Problems]

Next, means for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment.

In the compressor device of the present invention, the suction port 209 is formed at one end and the discharge port 214 is formed at the other end, and the outer diameter is formed to be tapered along the outer diameter of the thread tip of the screw 206 described later. Cylinder 205 and the cylinder 205
The tip of the spiral thread slidably contacts the inside to rotate at high speed, and the thread 21 extends from the suction port 209 side to the discharge port 214 side.
The pitch of the spirals of 6 is the same, and is composed of a screw 206 formed by reducing the outer diameter of the tip of the screw thread 216 in a taper shape, and a rotary drive unit 3 for rotating the screw 206. I am trying.

[Action]

The screw is rotated at a high speed by a screw thread tip slidingly contacting the inside of the cylinder by the rotation driving unit, and the fluid sucked from the suction port of the cylinder is formed by tapering the outer diameter of the screw. It is compressed and transferred to the discharge port side of the cylinder. Then, the compressed fluid is discharged from the discharge port of the cylinder.

〔Example〕

An embodiment of a compressor device according to the present invention will be described with reference to the drawings.

The compressor device 201 of the present embodiment is roughly composed of a compression unit 202 composed of a cylinder 205 and a screw 206, a rotary drive unit 3 and an accumulator 4.

Cylinder 205 of compression section 202 of this compressor device 201
Is formed in a substantially truncated cone shape along the outer diameter of the tip of the thread 216 of the screw 206 described later. A large number of radiating fins 207 for projecting heat from the cylinder 205 are provided on the outer peripheral surface. A bearing hole 208 is formed through the center of the large-diameter side base end wall 205a of the cylinder 205. A suction port 209 is formed on the large-diameter peripheral wall of the cylinder 205 so as to penetrate from the outside to the inside of the cylinder 205. On the other hand, a bearing portion 212 formed in a concave shape is provided in the center of the inner surface of the tip wall 205b on the small diameter side of the cylinder 205 so as to correspond to the bearing hole 208. A discharge port 214 similar to the suction port 209 described above is provided on the peripheral wall of the tip wall 205b.

Next, in the screw 206, the threads 216 are spirally continuous with respect to the central axis 215 and are formed at the same pitch from the tip to the base, and the outer diameter at the tip of the threads 216 is , Tapered. Both ends of the central axis 215 of the screw 206 are pivotally supported by the bearing hole 208 and the bearing portion 212 of the cylinder 206 described above.
One end of the central axis 215 of the screw 206 penetrates the bearing hole 208 of the cylinder 205 and projects to the outside of the cylinder 205. The driven pulley 21 is attached to the protruding shaft end 215a.
7 are provided.

As shown in FIG. 2, at the tip of the screw thread 216 of the screw 206, in order to maintain airtightness and lubricity between the screw 206 and the inner surface of the cylinder 205, a sealing material 18 made of a heat-resistant and high-speed wear-resistant material is used. Are continuously provided. And this screw thread
The sealing material 18 at the tip of 216 is in sliding contact with the inner peripheral surface of the cylinder 205.

Next, the rotation drive unit 3 is composed of a motor and the like, and its drive shaft
A drive pulley 19 is provided on 3a. This drive pulley 19
Is linked to the driven pulley 217 of the screw 206 described above via the belt 20, and transmits the rotation of the rotation drive unit 3 to the screw 206.

Next, the accumulator 4 is connected to the discharge port 214 of the cylinder 205.
Is connected by a connection pipe 21 via a check valve (not shown). This accumulator 4 has a pressure indicator
22 is provided so that the pressure in the accumulator 4 is constantly displayed. Further, when the pressure in the accumulator 4 exceeds a predetermined pressure, the above-mentioned rotary drive unit 3 is temporarily stopped by an automatic control device (not shown), or the pressure safety valve (not shown) of the accumulator 4 increases the pressure in the accumulator 4. Exhaust of compressed air (arrow C)
Is being carried out.

Therefore, in the compressor device 201 of this embodiment, the air that has passed through the air inhaler 11 and is sucked into the cylinder 205 of the compression unit 202 (arrow A) rotates the screw 206 at high speed and the outer diameter of the screw 206. From the suction port 209 side to the discharge port 214
Since it is formed to decrease toward the side, it is compressed and transferred from the discharge port 214 to the accumulator 4. The compressed air is stored in the accumulator 4.

In the compressor device 201 configured in this way, since the device body does not have a reciprocating mechanism, vibration does not occur, and since fluid compression is performed by high-speed rotation of the screw, the discharged fluid has no pulsation and no surging region. In addition, since the structure does not require precision, handling of dirty gas does not cause deterioration of the physical condition, and since internal lubrication is not performed, the handling gas does not contain oil. Furthermore, because there is no limit to the compressed gas,
Both low specific gravity gas and high specific gravity gas can be handled. Moreover, since the screw is configured by a single screw, the normal rotation speed of the screw during normal use is far lower than the shaft dangerous rotation speed. Since the screw 206 used in this compressor device has the same spiral pitch of the screw thread 216, the screw thread 21 is manufactured after the spiral screw is manufactured by a usual manufacturing method and device.
It can be manufactured by cutting the tip of 6 into a taper shape, and its manufacture and adjustment are easy. Moreover, since the outer diameter of the cylinder 205 is tapered along the outer diameter of the tip of the screw thread of the screw 206, the small diameter allows the accumulator 4 to be housed outside the space, which is space efficient.

Further, in the present embodiment, the example in which the compressor device stores the compressed air in the accumulator 4 has been described, but a refrigerant gas is used, and a condenser,
An expansion valve, an evaporator, etc. may be connected to form a vehicle-mounted cooler or the like.

[Effects of the Invention] As described above, the compressor device according to the present invention is a compressor device of a type in which a screw is rotationally driven in a cylinder, and the spiral pitch of the screw threads 216 is the same and the outside of the tip of the screw threads 216. Since the screw 206 formed by reducing the diameter in a taper shape is used, a spiral screw can be manufactured by a usual manufacturing method and device, and then the tip of the screw thread 216 can be cut in a taper shape to manufacture.
Its manufacture and adjustment is easy. Further, since the outer diameter of the cylinder 205 is tapered along the outer diameter of the tip of the screw thread of the screw 206, it is possible to store the accessory parts of the accumulator 4 outside the space having a small diameter, which is good for space efficiency. Has an excellent effect in practical use.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a compressor device according to the present invention, and FIG. 2 is a partially enlarged sectional view of a screw. 201 ... Compressor device, 3 ... Rotation drive unit, 205 ...
Cylinder, 206 ... Screw, 209 ... Suction port, 214 ...
… Discharge port, 215 …… Central axis, 216 …… Thread.

Claims (1)

[Claims] 1. A cylinder having a suction port formed at one end and a discharge port formed at the other end, the outer diameter of which is tapered at the tip of the screw thread of the screw described below along the outer diameter, The tip of the spiral screw thread slides in the cylinder to rotate at high speed, and the pitch of the spiral of the screw thread from the suction port side to the discharge port side is the same, and the outer diameter of the screw thread tip is tapered. A compressor device comprising a screw formed by the above and a rotary drive unit for rotating the screw.