JPH01277688A - Automatic transmission device in compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention is an automatic speed change in a compressor suitable for reducing power loss and saving energy by changing the rotation speed of the compressor according to the amount of air used. Device.

[Conventional technology]

As shown in FIG. 2, the compressor commonly employed in the past compresses atmospheric air from a suction system 10 with a compressor 9, and transfers the compressed air at a predetermined pressure to a receiver tank 13 through a discharge gap 11 having a check valve 12. After the oil 15 is introduced into the oil tank 13 and separated by the oil separator 14, the oil 15 is sent to the use side from the air supply pipe 16 with an on-off valve 17 interposed therebetween, and the oil 15 accumulated in the receiver tank 13 is transferred to the return pipe 20 and the oil cooler 2. ] , and is configured to return to the compressor 9 through the compressor 9 and repeat the same operation. Note that the drain pipe 19 having the on-off valve 18 is for appropriately draining water in the oil 15 accumulated in the receiver tank 13.

The compressor 9 is generally rotated by a motor 8 via a belt, but in many cases the rotation is constant, and in some cases it is variable using an inverter or the like to match the amount of air used, but in most cases It was formed from the structure described above.

[Problem to be solved by the invention]

As shown in Figure 6, the Pv diagram of a general compressor is 0.
After inhaling air at point pressure po (atmospheric pressure) to point A of volume V□, it is compressed and raised to point B of pressure P (predetermined pressure), discharged to point 0, and then returned to the original 0 point. repeating the cycle. 0 points.

The area surrounded by point A, point B, and point 0 represents the amount of work of the compressor. Generally, in the above Pv diagram, each part is configured so as to exhibit high efficiency at the maximum amount of air used.

When unloading the compressor, the suction system 10 is closed and only a small amount of air is sucked into the compressor, so the suction pressure becomes a negative pressure P7 as shown in Fig. 6, and after suction reaches point F, it reaches point 0. It is compressed and becomes a cycle from 0 point back to 0 point. The workload of the compressor in this case is point E, point F, point H, and point G.

This is the area surrounded by point B and point 0. Although this area is smaller than the amount of work (that is, power consumption) at the time of the maximum amount of air used, a considerable amount of power is required.

Next, as shown in Figure 7, if the horizontal axis shows the air usage Q (%) and the vertical axis shows the power consumption W (%), then the power consumption W is calculated at point B where the air usage Q is 100%. If it is 100%,
Even when the air consumption Q is 0%, a problem arises in that approximately 60% of the power consumption W is required. In other words, even when air is not required, the compressor requires a large amount of power consumption, which is contrary to energy conservation.

The present invention solves the above-mentioned problems, and is a relatively simple and inexpensive automatic speed change in a compressor that changes the power of the compressor depending on the amount of air used, thereby saving energy. The purpose is to provide equipment.

c Means for Solving the Problem] For this purpose, the present invention connects a compressor and a motor that drives it with a belt, and automatically adjusts the contact positions of the compression side and the motor side where the belt is wound. The present invention constitutes an automatic transmission device for a compressor, which is equipped with a belt-type automatic transmission mechanism that enables automatic speed change by changing the amount of air used, and operates the automatic transmission mechanism in accordance with the amount of air used.

[Effect]

Although the length of the belt installed between the pulley on the compressor side and the pulley on the motor side is constant, the rotation ratio can be changed by changing the pulley width. This belt-type automatic transmission mechanism itself is a known technology, but by changing the rotation ratio, the operating state of the compressor is changed and power consumption is adjusted.

The power consumption of the compressor can be varied by rotating the compressor at high speed when the amount of air used is large, and by rotating the compressor at low speed when the amount of air used is small or during unloading.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In Figure 2, pulley pieces 2 and 3 are connected to the compressor 9, and pulley pieces 5 and 6 are connected to the motor 8 side. The width dimension between the pulley pieces 2 and 3 and the width dimension of the pulley pieces 5 and 6rIIJ can be changed at any time by the action of the drive adjustment means 4 and 7. The pulley pieces 2 and 3 are arranged to face each other, and a V-groove formed in the width direction forms a V-pulley. The pulley pieces 5 and 6 are also formed in the direction of their width dimensions, and the grooves form a V pulley. The belt 1 is installed between these V pulleys. For example, in FIG. The case where the belt l is wound around the inner peripheral end side is shown on the opposite side.

For example, as shown in Fig. 5, if the radius of the V-pulley of pulley piece 2°3 is R□, and the radius of the V-pulley of pulley pieces 5 and 6 is R2, the rotation ratio is expressed as R/R2. .

On the other hand, as shown in FIG. 4, for example,
Wrap belt 1 around the innermost circumference of the pulley, and pulley pieces 5 and 3
R0' is the radius when the belt 1 is wound around the outermost side of the V-pulley.

The rotation ratio R2' is R'/R,' and R1
This is a change from the case of /R2. Therefore motor 8
Even if the compressor 9 is always rotating at a constant rotation speed, it is possible to freely change the rotation speed on the compressor 9 side.

By setting an appropriate belt-type automatic transmission mechanism, it is possible to achieve a rotation ratio of approximately 1/2.

As shown in FIG.
2 are connected to each other, and the controller 22 is configured to receive signals such as the pressure value in the receiver tank 13 or the pressure value on the user side. The control device 22 operates the drive adjusting means 4, 7 based on this input signal, and changes the distance between the pulley pieces 2, 3 and the pulley pieces 5, 6 so that the width can be adjusted to match the calibrated pressure value. It is configured. Therefore, if a large amount of air is required, increase the rotation speed of the compressor 9.
The rotation speed of the compressor 9 can be lowered during unloading or when using a small amount of air.

FIG. 1 shows an example of this, and it is now possible to adjust the line that conventionally descends from point B to point 0 to descend to point D. In other words, power consumption can be significantly reduced from 60% to X%. The percentage of X% depends on the automatic transmission mechanism.

An appropriate one is selected depending on the capacity of the compressor, purpose of use, etc.

Although it has been possible to automatically change the speed of a compressor in the past, this embodiment uses an extremely simple belt-type automatic speed change mechanism.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the rotation speed of the compressor can be changed according to the amount of air used by relatively simple means, and the effect is that power loss can be reduced and energy conservation can be achieved. is raised.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the effects of one embodiment of the present invention,
Fig. 2 is an overall configuration diagram of the embodiment, Fig. 3 is an enlarged side view around the V-pulley to explain the state of change in rotation speed, and Fig. 4 is an enlarged side view of the V-pulley and its surroundings.
Fig. 5 and Fig. 5 are explanatory diagrams for explaining changes in rotation ratio, Fig. 6 is a Pv diagram of a conventional compressor, and Fig. 7 shows the relationship between the conventional compressor and the power consumption of air-using equipment. It is a line diagram. 1... Belt, 2, 3, 5, 6... Pulley piece, 4,
7... Drive adjustment means, 8... Motor. 9...Compressor, 10...Suction system, 11...Discharge pipe, 12...Check valve, 13...Receiver tank, 14
...Oil separator, 15...Oil, 16...Air pipe, 17.18...Opening/closing valve. 19...Drain pipe, 20...Return pipe, 21...
Oil pulley, 22...control device.

Claims (3)

[Claims] (1) A compressor that transmits the rotation of the motor to the compressor side via a belt mechanism, and changes the rotation speed of the compressor in response to a wide range of air usage between the unloader and the maximum usage state. In an automatic transmission device for a machine, a belt of a certain length is installed between a pulley on the motor side connected to the motor and a pulley on the compressor side connected to the compressor, and the contact position of the belt and the pulley in the radial direction is determined. 1. An automatic transmission device for a compressor, characterized in that an automatic belt transmission means is provided for automatically changing the speed of the compressor. (2) The automatic transmission device according to claim 1, which is configured to detect the amount of air used by the compressor and automatically adjust the automatic belt transmission mechanism based on the detection signal. (3) An automatic transmission device for a compressor, wherein the automatic belt transmission means is configured to set the compressor rotation speed during unloading to about A/2, where A is the compressor rotation speed at the time of maximum usage.