JPS63129181A - Control for number of units of plural compressors in use - Google Patents

Abstract

PURPOSE:To equalize the use of a number of compressors by selecting one among a number of compressors as a master compressor and receiving and transmitting noiseless signals for the rest slave compressors. CONSTITUTION:A master compressor 1 is selected from among six compressors, and the rest are used as slave machines. The rise of the discharge air pressure is detected, and if the pressure is short, a prescribed frequency is transmitted to the slave machines. The operation state of a desired compressor can be known by reversely transmitting the starting state corresponding to the transmission into the master compressor 1. Therefore, the use of compressor can be equalized.

Description

[Detailed description of the invention]! ! Industrial Application Field The present invention is applicable to compressors used in multiple units, in which signals with different frequencies can be transmitted from an arbitrarily set master compressor to slave compressors, and only the necessary compressors can be started or stopped without noise. The present invention relates to a method for controlling the number of machines.

Conventional Technology Multiple compressors are used in factories, etc., but it is often not necessary to operate all the compressors at the same time. In this case, control is required to start the desired compressor and stop the remaining ones. needs to be done automatically. #eThis method first starts one compressor, and if the pressure of the delivered air does not rise to the predetermined pressure even after a predetermined elapsed time, the next compressor is started in sequence. Air at a predetermined atmospheric pressure is supplied by using a command control method such as 1, for example, R32.
Transmission was performed using 32C serial transfer or parallel transfer.

Problems to be Solved by the Invention With the R3232C serial transmission method, it is necessary to match the speed and bit e of each transmitter/receiver @ device, and the wiring is fixed, so it can be used in multiple compressors without changing the wiring. A problem arises in that it is not possible to select any arbitrary one as the master compressor (compression fI& which is the basis for issuing the command), and there is also a problem in the failure of transmission. Furthermore, parallel transmission requires as many wires as the number of compressors, creating a problem in that the transmitter/receiver is complicated. In addition, with conventional transmission and reception methods, transmission and reception between compressors that are poorly installed is easily affected by noise, and it is necessary to take measures to prevent the effects of noise, creating problems that are complicated and costly. .

The great invention solves the above problems, and allows any one of multiple compressors to be selected as the master compressor without changing the wiring, as well as noiseless transmission and reception, allowing the necessary compressor An object of the present invention is to provide a method for controlling the number of compressors used in large numbers, which can be started or stopped reliably.

Means for Solving the Problems For this purpose, the present invention connects multiple compressors under the same conditions and connects them to a control device.

Any one of them is selected as the master compressor, and signals with different frequencies corresponding to the number of slave compressors are serially transmitted from the master compressor to the remaining slave compressors to start and stop the slave compressors. At the same time, each of the slave compressors transmits a response signal in response to the command to the master compressor, confirms the transmission from the master compressor, and starts only the necessary compressors. In addition, another slave compressor is selected as the master compressor, so that the use of multiple compressors can be equalized.

EXAMPLE Below, an example of the great invention will be explained based on the drawings. Six compressors are used on the wood flow side. The compressors are wired with the same equipment so that each can transmit a frequency signal. A master compressor l (hereinafter referred to as master CPI) arbitrarily selected from among the six units is started, and when a predetermined period of time has elapsed, the pressure of the air discharged to the supply side rises to the desired pressure. If there is a shortage, the master CPI transmits a frequency signal to be described below to start the slave compressor.

On the wood flow side, multiple compressors are connected under the same conditions.

Built-in wired frequency modulation transmitting circuit (not shown) and frequency discrimination receiving circuit (not shown), each compressor responds only when it receives the specified frequency belonging to it, and one controls in conjunction with this. The compressor is started or stopped through the device, and on the other hand, information on the compressor is transmitted back to the designated transmission compressor via a response circuit (not shown). . Further, one of these multiple compressors is selected as the master CP, and the remaining compressors are selected as slave CPs. For example, suppose there are six compressors as shown in FIG. 1. The specified frequencies belonging to each compressor are numbered 0 to 5. It is also possible to continuously send frequencies 0 to 5 from each compressor.

As mentioned above, one of the compressors is set as the master CP1, and when it is activated and a predetermined period of time has elapsed, it is confirmed whether the pressure of the air discharged to the supply side has risen to the desired pressure, If the pressure is insufficient, this master CPI will continuously transmit the specified frequency to which the desired slave CP belongs to the slave CP that you wish to start.For example, if you keep the specified frequencies 1 and 2 and transmit them continuously. Slave CP2 belonging to frequency No. 1 and slave C belonging to frequency No. 2
P3 receives this and activates it via each control device. At the same time, the master CPI activates in response to the transmission.
The operating status of the desired compressor can be known by transmitting the information back to .

FIG. 2 shows a state in which all signals numbered 0 to 5 are sent in reverse order. In this case, the frequency in use is 5KH.
The pitch interval of each frequency is 1-0, 15ec in steps of 2. Furthermore, when the operation of the slave CP2 and slave CP3 is stopped and the slave CP4 and slave CP5 are activated, it is sufficient to transmit the prescribed frequencies No. 3 and No. 4 belonging thereto.

As mentioned above, when you want to operate multiple compressors, consider one of them as the master CP and the others as slave CPs.
You can freely start or stop the desired compressor depending on the supply situation, and there is no need to run the compressor unnecessarily.
Efficient operation can be managed, and the noise generated by the compressor can also be reduced.

FIG. 3 shows an embodiment in which the master CP is changed. As described above, each compressor is wired under the same conditions, and any one of them can be made the master CP. In FIG. 3, the slave CP4 in FIG. 1 is replaced by the master CP4A, and in this case, the master CPI in FIG.
Becomes PIA. As in the previous embodiment, serial signals of different frequencies are transmitted from the master CP4A to the remaining slave compressors and the like.

As described above, since any one of multiple compressors can be set as the master CP, the use of each compressor is equalized, and there is no need to drive only a specific compressor for a long time. In addition, the number of slave CPs to be driven can be set arbitrarily, and use of one slave CP unevenly is prevented. Furthermore, since the frequency signal is used, noise is prevented as described above, resulting in highly reliable operation.

Effects of the Invention As is clear from the above explanation, according to the present invention, any compressor can be used without changing the wiring each time, leveling out usage, and only necessary compressors can be reliably started. The effect of preventing noise can be increased. It also saves power costs and provides highly reliable operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of one embodiment of the present invention, FIG. 2 is a diagram showing frequency signals in the embodiment, and FIG. 3 is a configuration diagram of another embodiment of the present invention. 1...Control device, 2,4A...Excellent master compressor, 2A
, 3.4.5, 6.7 to 15.1B, 17...Slave compressor.

Claims (1)

[Claims] Multiple compressors are equipped with frequency modulation transmission circuits and frequency discrimination circuits, and one of the multiple compressors connected under the same conditions is selected as the master compressor, and the remaining compression The master compressor is a slave compressor, and each compressor has a mechanism that only receives and responds to its own specified frequency.If the master compressor specifies and transmits the specified frequency to each slave compressor, each slave compressor that receives this The compressor responds to reception only when it corresponds to its own specified frequency, and on the one hand, starts or stops the compressor via a control device interlocked with this, and on the other hand, controls the master compressor via a response circuit. A method for controlling the number of compressors used in multiple units, characterized by transmitting information regarding the compressor in response to the designated transmission.