JPH06323487A - Pulsation attenuator - Google Patents

Abstract

PURPOSE:To dispense with a special space to install a pulsation attenuator, and attenuate pressure pulsation at low cost by constituting a side branch type muffler of a part of a branch pipe in a circuit where the branch piping connected to a piping arranged continuously to a pulsation source. CONSTITUTION:A branch part 2 is connected to one main pipe 1b, and the other main pipe 1a and a branch piping 3a for a pressure switch 4 are connected to the branch part 2. In this case, the branch piping is set in a diameter in the same degree with a diameter of a piping in which refrigerant gas flows, and is set in a 1/4 length of a wave length of pressure pulsation to be reduced. Thereby, since the branch piping 3a is used as a pulsation attenuator, a special space to install the pulsation attenuator can be dispensed with, and the pressure pulsation can be attenuated at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsation attenuator and a refrigerating and air-conditioning apparatus equipped with the same.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of an expansion chamber type muffler as an example of a conventional pressure pulsation damper. In the figure, 1
Reference numerals a and 1b are main pipes, and 6 is an expansion chamber. In this device, the pressure pulsation propagating from the side of the pipe 1b is attenuated in the expansion chamber 6 and propagates toward the pipe 1a.

FIG. 4 is a vertical sectional view of a side branch muffler as another example of the conventional pressure pulsation attenuator. In the figure, 1a and 1b are main pipes, 2 is a branch part, and 3c is a branch pipe whose tip is closed. In this device, a part of the pressure pulsation propagating from the pipe 1b side is attenuated on the branch pipe side, and the damped pulsation propagates toward the pipe 1a.

With these devices, discharge pulsation generated in a compressor such as an air conditioner can be reduced, and noise generated by vibration due to pressure pulsation can be reduced.

[0005]

In mounting the above-mentioned conventional muffler, a space for the muffler is required,
In addition, there is a problem that the cost is increased. The present invention is intended to solve such problems, and it is an object of the present invention to obtain a pressure pulsation reducing effect without requiring a new space and slightly increasing the cost.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above problems and relates to a pulsation attenuator and a refrigeration air-conditioning apparatus with a pulsation attenuator having the following features. (1) A pulsation attenuator characterized in that, in a circuit in which a branch pipe is connected to a pipe connected to a pulsation source, a side branch type muffler is formed in a part of the branch pipe portion. (2) In a refrigeration / air-conditioning system in which a branch pipe is connected to a discharge pipe of a compressor, a side branch type muffler is formed in a part of the branch pipe part, and a refrigeration / air-conditioning device with a pulsation attenuator is provided. .

[0007]

According to the present invention, since the side branch type muffler is constructed by utilizing the branch pipe portion originally existing in the circuit, it is necessary to newly secure a space for installing the pulsation attenuator. Moreover, pulsation can be reduced at low cost. The principle of action of this pulsation damping is the same as that of the second example of the prior art.

[0008]

1 is a longitudinal sectional view of a pulsation damper according to a first embodiment of the present invention. In the figure, 1a and 1b are main pipes through which a refrigerant gas flows, 2 is a branch part, 3a is a branch pipe for a pressure switch, and 4 is a pressure switch. Conventionally, the branch pipe for the pressure switch was a thin pipe, but it has a diameter approximately the same as the pipe diameter through which the refrigerant gas flows, and the length L is reduced to 1/4 of the wavelength of the pressure pulsation to be reduced. To the length of.

FIG. 2 is a vertical sectional view of a pulsation damper according to a second embodiment of the present invention. In the figure, 1a and 1b are main pipes through which a refrigerant gas flows, 2 is a branch part, 5 is a two-way valve, 3b is a branch pipe branched from the branch part 2 and connected to the two-way valve 5. The branch pipe 3b has a large diameter until just before the valve, and the length L of the large diameter portion is set to 1/4 of the wavelength of pressure pulsation to be reduced.

In all of these embodiments, the originally existing branch pipe portion is used as a pulsation attenuator in the refrigerant circuit, and a pipe having an appropriate diameter is branched so as to meet the purpose. It is used as a pipe, and its length L is a length suitable for damping pressure pulsations. With such a structure, it is not necessary to secure a space for installing the pulsation attenuator, and the pressure pulsation is damped by the same operation principle as the second example of the conventional art. Also in this case,
The sound reduction shown in the following equation becomes possible.

[0011]

[Equation 1]

[0012]

EFFECTS OF THE INVENTION The pulsation attenuator of the present invention is a side branch type part of the branch pipe portion in a circuit in which a branch pipe is connected to a pipe connected to a pulsation source, particularly a discharge pipe of a compressor. Since it is a muffler, it is not necessary to secure a space for installing the pulsation attenuator.
In addition, the effect of pulsation damping can be exhibited at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pulsation attenuator according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a pulsation attenuator according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a first example of a conventional pulsation attenuator.

FIG. 4 is a vertical sectional view of a second example of a conventional pulsation attenuator.

[Explanation of symbols]

 1a, 1b Main piping 2 Branch parts 3a, 3b, 3c Branch piping 4 Pressure switch 5 Two-way valve 6 Expansion chamber

Claims (2)

[Claims] 1. A pulsation attenuator, characterized in that, in a circuit in which a branch pipe is connected to a pipe connected to a pulsation source, a side branch type muffler is constituted by a part of the branch pipe portion. 2. A refrigeration / air-conditioning apparatus in which a branch pipe is connected to a discharge pipe of a compressor, wherein a side branch type muffler is formed in a part of the branch pipe portion. Air conditioner.