JP2011174481A - Pipe vibration reducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately determine a position to be supported by a variable supporting device, and to appropriately control the driving to the supporting position. <P>SOLUTION: The moving direction and moving distance of the variable supporting device 6 is determined from information on the drive frequency of a refrigerant compressor from a compressor control device 2 controlling the drive frequency of the inverter-driven refrigerant compressor 1, and information on vibration of a refrigerant pipe from a vibration determination device 5 determining whether or not an amplitude value measured by a vibration measurement device 4 measuring the vibration of the refrigerant pipe 3 is equal to or higher than a vibration determination amplitude value. The driving device 7 of the variable supporting device is controlled based on the determined moving direction and moving distance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe vibration reducing apparatus, and more particularly to a pipe vibration reducing apparatus that prevents breakage due to vibration of refrigerant pipes in an outdoor unit of an air conditioner equipped with a refrigerant compressor driven by an inverter.

  Refrigerant piping connected to the discharge side and suction side of the refrigerant compressor mounted inside the outdoor unit of the air conditioner suppresses the transmission of vibration from the refrigerant compressor serving as the excitation source. Takes length. Therefore, when the driving frequency of the refrigerant compressor matches the natural frequency of the refrigerant pipe, the vibration at the curved portion of the refrigerant pipe increases, and the refrigerant pipe due to an increase in stress at the root (connection portion with the refrigerant compressor). Folding sometimes occurred.

  In order to prevent this, conventionally, the refrigerant pipe is supported by a support device having a variable support position, and when the vibration of the refrigerant pipe increases, the support position of the refrigerant pipe is shifted, and thereby the natural frequency of the refrigerant pipe. Is substantially changed to avoid the resonance phenomenon (see, for example, Patent Document 1).

JP-A-8-135729 (FIG. 4)

  As described above, conventionally, since control for reducing vibration based on only vibration information of the refrigerant pipe, that is, control for shifting the support position of the refrigerant pipe, is performed, the moving direction and moving distance of the support device are appropriately set. The control cannot be performed, and the control is performed while searching for an optimal support position, and there is a problem that the support position must be frequently changed.

  Moreover, there was no proposal about the specific structure of the variable support apparatus which can be moved to a support position quickly and can support refrigerant | coolant piping firmly.

  A first technical problem of the present invention is to be able to accurately determine a position to be supported by a variable support device and to appropriately perform drive control to the support position.

  A second technical problem is to enable the variable support device to be quickly moved to the support position and to firmly support the refrigerant pipe.

  A pipe vibration reduction device according to the present invention includes a compressor control device that controls the drive frequency of an inverter-driven refrigerant compressor, a vibration measurement device that measures vibration of a refrigerant pipe, and an amplitude value measured by the vibration measurement device vibrates. From a vibration determination device that determines whether or not the determination amplitude value is greater than or equal to, a variable support device that can support the refrigerant piping and change the support position, a drive device that moves the variable support device, and a compressor control device The moving direction and the moving distance of the variable support device are determined from the driving frequency information of the refrigerant compressor and the vibration information of the refrigerant pipe from the vibration determining device, and the driving device is determined based on the determined moving direction and moving distance. And a control device that performs control.

  In the pipe vibration reducing device of the present invention, the control device moves and moves the variable support device based on the refrigerant compressor drive frequency information from the compressor control device and the refrigerant pipe vibration information from the vibration determination device. Since the distance is determined and the driving device is controlled based on the determined moving direction and moving distance, the position to be supported by the variable support device can be accurately determined, and the drive control to the supporting position is performed. Can be performed appropriately.

1 is an overall configuration diagram of a pipe vibration reducing device according to an embodiment of the present invention. It is a perspective view which shows roughly the structure of the variable support apparatus which is the principal part of the piping vibration reduction apparatus which concerns on embodiment of this invention. It is a flowchart which shows the control action of the piping vibration reduction apparatus which concerns on embodiment of this invention.

  FIG. 1 is an overall configuration diagram of a pipe vibration reduction device according to an embodiment of the present invention, FIG. 2 is a perspective view schematically showing the structure of a variable support device that is the main part, and FIG. 3 is a flowchart showing the control operation. It is.

  In the pipe vibration reduction device of the present embodiment, a compressor control device 2 that controls the drive frequency is attached to an inverter-driven refrigerant compressor 1 as shown in FIG. In addition, a refrigerant pipe 3 is connected to the refrigerant compressor 1, and a vibration measuring device 4 that measures the vibration of the refrigerant pipe 3 is attached to the refrigerant pipe 3.

  The vibration measuring device 4 transmits vibration information such as the measured amplitude value to the vibration determining device 5.

  The vibration determination device 5 determines whether or not the amplitude value measured by the vibration measurement device 4 is greater than or equal to the vibration determination amplitude value, and transmits the determination result to the control device 8.

  The refrigerant pipe 3 is supported by the variable support device 6. The variable support device 6 is moved by the drive device 7 so that the support position of the refrigerant pipe 3 can be changed. The drive device 7 is configured to drive the variable support device 6 in response to a command from the control device 8.

  The control device 8 is a variable support device based on the vibration information of the refrigerant pipe 3 from the vibration determination device 5 and the drive frequency information (command drive frequency and current drive frequency information) of the refrigerant compressor 1 from the compressor control device 2. The movement direction and the movement distance 6 are determined, and a command is sent to the driving device 7.

  The compressor control device 2, the vibration determination device 5, and the control device 8 are all mounted on the control board 9.

  As shown in FIG. 2, the variable support device 6 includes three balls 10 that sandwich the refrigerant pipe 3, and an outer shell 11 that accommodates the balls 10 and rotatably supports them. Thereby, although it is a point contact, the refrigerant | coolant piping 3 can be firmly fixed by three points | pieces, and it can move now on the refrigerant | coolant piping 3 rapidly.

  Next, the operation of the pipe vibration reducing device of the present embodiment will be described based on the flowchart of FIG. 3 with reference to FIGS.

  First, in step S1, the vibration determination device 5 determines whether the amplitude value measured by the vibration measurement device 4 is greater than or equal to the first vibration determination amplitude value T1. If the measured amplitude value is greater than or equal to the first vibration determination amplitude value T1, whether or not the difference ΔHz between the command drive frequency from the compressor control device 2 and the current drive frequency is greater than 0 (ΔHz> 0) in step S2. Determine whether. If ΔHz> 0, the moving direction of the variable support device 6 is determined in a direction in which the natural frequency of the refrigerant pipe substantially decreases in step S3. If ΔHz> 0 is not satisfied, the moving direction of the variable support device 6 is determined in a direction in which the natural frequency of the refrigerant pipe substantially increases in step S4.

  When the moving direction is determined, it is next determined in step S5 whether or not the amplitude value measured by the vibration determination device 5 using the vibration measurement device 4 is greater than the second vibration determination amplitude value T2. When the measured amplitude value is larger than the second vibration determination amplitude value T2, the larger one of the two-step moving distances determined in advance in step S6 is determined. If the measured amplitude value is smaller than the second vibration determination amplitude value T2, the smaller moving distance is determined in step S7. Next, the determined moving direction and moving distance and the variable support device 6 are moved (step S8), the support position is changed, and the process returns to step S1.

  As described above, in the pipe vibration reducing device of the present embodiment, the control device 8 is based on the refrigerant pipe vibration information from the vibration determination device 5 and the refrigerant compressor drive frequency information from the compressor control device 2. Since the moving direction and the moving distance of the variable support device 6 are determined and the drive device 7 is controlled based on the determined moving direction and the moving distance, the support position of the refrigerant pipe 3 by the variable support device 6 is determined. It can be changed quickly and accurately.

  DESCRIPTION OF SYMBOLS 1 Refrigerant compressor, 2 Compressor control apparatus, 3 Refrigerant piping, 4 Vibration measuring apparatus, 5 Vibration determination apparatus, 6 Variable support apparatus, 7 Drive apparatus, 8 Control apparatus, 9 Control board, 10 Ball, 11 Outline.

Claims (2)

A compressor control device for controlling the drive frequency of the inverter-driven refrigerant compressor;
A vibration measuring device for measuring the vibration of the refrigerant pipe;
A vibration determination device that determines whether the amplitude value measured by the vibration measurement device is greater than or equal to the vibration determination amplitude value;
A variable support device that supports the refrigerant pipe and can change the support position;
A driving device for moving the variable support device;
The moving direction and moving distance of the variable support device are determined from the driving frequency information of the refrigerant compressor from the compressor control device and the vibration information of the refrigerant pipe from the vibration determination device, and the determined movement is determined. And a control device that controls the drive device based on a direction and a moving distance. The controller is
The amplitude value measured by the vibration measuring device is equal to or greater than the first vibration determination amplitude value T1, and the difference ΔHz between the command drive frequency from the compressor control device to the refrigerant compressor and the current drive frequency is less than zero. If it is larger, the variable support is directed in the direction of decreasing the natural frequency of the refrigerant pipe, and in the case where the difference ΔHz between the command drive frequency and the current drive frequency is smaller than 0, the natural frequency of the refrigerant pipe is increased While determining the direction of movement of the device,
When the amplitude value measured by the vibration measuring device is equal to or larger than the second vibration determination amplitude value T2, the amplitude value is equal to or smaller than the second vibration determination amplitude value T2 so that the moving distance is increased. 2. The piping vibration reducing device according to claim 1, wherein the moving distance is determined to be small.

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