JP2001133079A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change an undamped natural frequency by correcting the shape of refrigerant piping or adding a weight to the refrigerant piping since the undamped natural frequency of the refrigerant piping does not go beyond the vibration frequency range of a refrigerant compressor when a refrigeration device is assembled due to fluctuation in manufacturing the refrigerant piping and the structure or the like of equipment parts and the refrigeration device being connected to the refrigerant piping. SOLUTION: The frame or the like of the refrigeration device is provided with a plurality of mounting holes at the same pitch for one fixing device for fixing refrigerant piping, thus easily changing the natural frequency of the refrigerant piping by changing a fixed position and preventing the refrigerant piping from being damaged due to the generation of a resonance phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system connected to a cooling load such as a showcase installed in a room, and more particularly to a refrigeration system equipped with a refrigerant compressor driven by an inverter. The present invention relates to a refrigeration device that prevents the refrigeration.

[0002]

2. Description of the Related Art Conventionally, a refrigerant pipe is connected to a suction side and a discharge side of a refrigerant compressor mounted inside a refrigerating apparatus.
The structure is such that the vibration of the refrigerant compressor is directly transmitted to the refrigerant pipe. Therefore, in order to vibrate the refrigerant pipe at the time of starting, operating, stopping, etc. of the refrigerant compressor, the refrigerant pipe needs to have a certain length to absorb this vibration. Shake greatly, leading to damage due to generated stress. To prevent this, as shown in FIG. 7 and FIG.
At 9, the refrigerant pipe is directly fixed to the frame 50 or the like of the refrigeration apparatus to prevent the refrigerant pipe from swinging largely.

Further, in a refrigeration system using a refrigerant compressor driven by an inverter, the refrigerant compressor generates vibrations at a frequency higher than the basic frequency along with the basic frequency which is the operating frequency range of the inverter during operation. Therefore, the connected refrigerant pipe is also vibrated at this wide frequency range.

[0004] Refrigerant piping has a unique frequency due to its shape, configuration, and the like. When vibrated at a frequency equal to or close to the natural frequency, a resonance phenomenon occurs.
When this resonance phenomenon occurs, the stress generated due to the increase in the amplitude of the refrigerant pipe increases, leading to breakage.

Therefore, when assembling the refrigeration system, it is also necessary to design the refrigerant pipe so that the natural frequency of the refrigerant pipe does not match the operating frequency range of the inverter and its higher order frequency, and to fix the middle of the refrigerant pipe. So that the frequency does not change
It was firmly fixed to the frame of the refrigeration system without using any buffer material or the like.

[0006]

However, the refrigerant pipes and the equipment components connected to the refrigerant pipes and the structure of the refrigeration apparatus and the like vary during the manufacture thereof, and when the refrigeration apparatus is assembled, the refrigerant pipes are not connected. The natural frequency does not fall outside the excitation frequency range of the refrigerant compressor, and it is necessary to change the natural frequency by modifying the shape of the refrigerant pipe or adding a weight to the refrigerant pipe, and the fixing of the refrigerant pipe is firm. Therefore, there has been a problem that vibration of the refrigerant pipe is transmitted to the frame and noise is increased.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a low-noise refrigeration apparatus which is easy to assemble and has low noise.

[0008]

According to one aspect of the present invention, there is provided a refrigerating apparatus equipped with an inverter-driven refrigerant compressor, wherein a refrigerant pipe is mounted on a frame forming the refrigerating apparatus. In the fixing structure, the fixing position of the refrigerant pipe can be changed by providing the frame with a plurality of mounting holes at the same pitch for one fixing device for fixing the refrigerant pipe.

According to a second aspect of the present invention, the fixing device comprises:
Since two or more refrigerant pipes are provided, the vibration in the rotational direction of the refrigerant pipe around the fixed position is suppressed.

[0010] According to a third aspect of the present invention, in the fixing device,
A substantially L-shaped fixture having a flat portion for fixing the refrigerant pipe and a flat portion for fixing to the frame, and a fixing bracket having an opening angle of about 90 degrees or 135 degrees is provided. Thereby, the vibration damping direction is selected with respect to the main vibration direction of the refrigerant pipe.

According to a fourth aspect of the present invention, the fixing bracket elastically supports the refrigerant pipe by using an elastic steel or stainless steel material.

According to a fifth aspect of the present invention, in the fixing device,
By providing a tubular elastic body having a convex shape continuous in the longitudinal direction on the inner peripheral surface or the inner and outer peripheral surfaces that covers the periphery of the refrigerant pipe, vibration transmission of the refrigerant pipe is prevented.

[0013]

Embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same configurations as those in the related art.

FIG. 1 shows an example of the configuration of a refrigeration apparatus according to the present invention. Refrigerant gas evaporated and vaporized by an evaporator (not shown) such as a showcase installed in a room is supplied to the suction side of the refrigeration apparatus. The refrigerant is drawn into the refrigerant compressor 2 from the connected refrigerant pipe 20 via the gas-liquid separator 1. The refrigerant gas compressed by the refrigerant compressor 2 passes through the oil separator 3 connected to the discharge side and is connected to the condenser 4 by the refrigerant pipe 10 on the discharge side (the condenser 4 is installed separately from the refrigerating device). ), And the condensed and liquefied refrigerant is sent to the evaporator by the refrigerant pipe 11 via the gas-liquid separator 5 to form a refrigeration cycle. The refrigerant pipes 10 and 20 are fixed to the frame 50 and the substrate 40 of the refrigerating device by a fixing device 15 in order to prevent damage due to large swings due to vibration.

Here, the refrigerant compressor 2 generates vibrations and pressure pulsations at the time of starting, during operation, at the time of stopping, and the like by the internal compression mechanism and the electric motor that drives it. Thereby, the refrigerant pipes 10 and 20 connected to the refrigerant compressor and forming the refrigeration cycle are vibrated and vibrate.

Further, in the refrigeration system in which the refrigerant compressor 2 is driven by an inverter, the vibration frequency during operation is excited at a higher frequency than the basic frequency in the operating frequency range of the inverter. Refrigerant piping 10, 20
Will oscillate at this wide range of frequencies.

Further, the refrigerant pipe has a unique frequency due to its shape, configuration, and the like, and this natural frequency needs to be different from the above-mentioned wide excitation frequency in order to avoid resonance.

However, the refrigerant pipe and the components connected to the refrigerant pipe, the structure of the refrigeration apparatus, and the like vary during the manufacture thereof, and the natural frequency of the refrigerant pipe at the time of completion of the assembly of the refrigeration apparatus has a resonance frequency. If the frequency does not become such that the frequency can be avoided, it is necessary to change the natural frequency.

In the present invention, since a plurality of mounting holes 30 are provided at the same pitch with respect to one fixing device in the frame 50 or the substrate 40 on which the fixing device 15 for the refrigerant pipes 10, 20 is mounted, the shape of the refrigerant pipe can be changed. The natural frequency of the refrigerant pipe can be easily changed by changing the mounting position without performing a correction operation such as adding a weight to the refrigerant pipe. Thereby, occurrence of the resonance phenomenon can be avoided, and breakage of the refrigerant pipe can be prevented.

In addition, if the refrigerant pipe fixing device 15 is located at one position for one refrigerant pipe, the refrigerant pipe is likely to vibrate in the rotational direction around the fixed position, and the refrigerant pipe ahead of the fixed position. Although this vibration is easily transmitted, the vibration in the rotational direction can be easily suppressed by providing two or more fixing devices for one refrigerant pipe of the present invention.

FIG. 2 shows a refrigerant pipe fixing device 15 according to the present invention.
3 shows a cross section of a main part of FIG. 2, and FIG.
Reference numeral 0 denotes a frame of the refrigerating apparatus, and a fixing bracket 16 is fixed by screws 19. The periphery of the refrigerant pipe 10 is covered with an elastic body 17, and a portion of the refrigerant pipe 10 is fixed to a fixing bracket 16 with a fastener 18 with screws 19. 4 and 5 show examples in which the shape of the fixing bracket 16 is different.

Here, a description will be given based on an example in which the fixing device of the present invention is attached to the refrigerant pipe 10 on the discharge side.

The fixing device of the present invention has a flat portion 16a for fixing to the frame 50 and a flat portion 16b for fixing the refrigerant pipe, and in the example of FIG. , A fixing bracket 1 whose opening angle is formed at about 90 degrees
With the provision of 6, the vibration damping effect is enhanced as compared with the case where the main vibration direction of the refrigerant pipe is the horizontal direction.
Further, in the example of FIG.
By providing the fixing bracket 16 formed at 35 degrees, the vibration damping effect is enhanced as compared with the case where the main vibration direction of the refrigerant pipe is an oblique direction. Furthermore, in the example of FIG. 5, the provision of the fixture 16 in which the plane portions 16a and 16b are formed substantially in parallel increases the vibration damping effect as compared with the case where the main vibration direction of the refrigerant pipe is the vertical direction. .

This makes it possible to select the direction in which the vibration is to be damped, so that the vibration in the maximum direction generated by the shape of the refrigerant pipe and the state in which it is vibrated can be effectively damped. The shape design can be simplified.

Further, since the fixing bracket 16 is made of an iron or stainless steel having elasticity,
Its manufacturing can be easily and cheaply manufactured by pressing, reducing the transmission of the vibration of the refrigerant piping to the frame of the refrigeration equipment,
Noise can be prevented from being generated.

Further, the elastic body 17 covering the periphery of the refrigerant pipe
The shape is a cylindrical shape having a convex shape that is continuous in the longitudinal direction on the inner peripheral surface or the inner and outer peripheral surfaces shown in FIG. 6, and the material is a rubber-based elastic material, so that it can be manufactured at low cost by continuous extrusion molding. In addition, the vibration of the refrigerant pipe can be effectively suppressed, and the transmission of the vibration to the fixture can be effectively prevented.

As the material of the elastic body 17 used for the fixing device for the refrigerant pipe on the discharge side, a silicone rubber having durability against high temperature is recommended, but other materials may be used depending on the surface temperature of the refrigerant pipe. Can also be used. Further, the convex shape may be formed in a large number of dowels.

[0028]

As described above, according to the first aspect of the present invention, there is provided a refrigeration system equipped with an inverter-driven refrigerant compressor, wherein a refrigerant pipe is fixed to a frame forming the refrigeration system. The frame has a plurality of mounting holes at the same pitch for one fixing device for fixing the refrigerant pipe, so that the natural frequency of the refrigerant pipe changes due to the variation of each part or structure. The fixed position of the refrigerant pipe can be changed by changing the natural frequency of the refrigerant pipe without correcting the shape of the refrigerant pipe or adding a weight to the refrigerant pipe, thereby avoiding the occurrence of resonance phenomenon and damaging the refrigerant pipe Can be prevented.

According to the second aspect of the present invention, the fixing device comprises:
Since two or more refrigerant pipes are provided, the vibration in the rotational direction of the refrigerant pipe around the fixed position can be easily suppressed.

According to a third aspect of the present invention, in the fixing device,
A substantially L-shaped fixture having a flat portion for fixing the refrigerant pipe and a flat portion for fixing to the frame, and a fixing bracket having an opening angle of about 90 degrees or 135 degrees is provided. By this, it is possible to select the vibration damping direction with respect to the main vibration direction of the refrigerant pipe, so that it is possible to effectively suppress the maximum vibration generated due to the shape of the refrigerant pipe and the state of being excited. Become.

According to the fourth aspect of the present invention, since the fixing fitting is made of an iron-based or stainless steel-based material having elasticity, it can elastically support the refrigerant pipe. It is possible to reduce transmission to the frame of the device and prevent generation of noise.

According to the invention of claim 5, the fixing device includes:
By providing a cylindrical elastic body having a convex shape that is continuous in the longitudinal direction on the inner peripheral surface or the inner peripheral surface, which covers the periphery of the refrigerant pipe, vibration of the refrigerant pipe is suppressed, and vibration of the fixing bracket is reduced. Transmission can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigeration apparatus showing an embodiment of the present invention.

FIG. 2 is a front view showing a refrigerant pipe fixing device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a main part of FIG. 2;

FIG. 4 is a sectional view of a main part showing a refrigerant pipe fixing device according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a refrigerant pipe fixing device according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a convex shape of an elastic body according to another embodiment of the present invention.

FIG. 7 is a front view showing a fixing portion of a conventional refrigerant pipe.

FIG. 8 is a sectional view of a main part of FIG. 7;

[Explanation of symbols]

 10: Refrigerant piping 15: Fixing device 16: Fixing bracket 17: Elastic body 18: Stopper 50: Frame

Claims (5)

[Claims] 1. A refrigeration system equipped with an inverter-driven refrigerant compressor, in which a refrigerant pipe is fixed to a frame forming the refrigeration apparatus, wherein a fixing device for fixing the refrigerant pipe to the frame. A refrigeration system comprising a plurality of mounting holes at the same pitch for one. 2. The refrigeration apparatus according to claim 1, wherein two or more fixing devices are provided for one refrigerant pipe. 3. The fixing device has a substantially L-shape having a flat portion for fixing the refrigerant pipe and a flat portion for fixing to the frame, and has an opening angle of about 90 degrees or 135 degrees. The refrigeration apparatus according to claim 1, further comprising a fixing bracket formed in the refrigeration apparatus. 4. The refrigeration apparatus according to claim 1, wherein the fixing bracket is made of an iron-based or stainless steel-based material having elasticity. 5. The fixing device according to claim 1, further comprising a cylindrical elastic body covering the refrigerant pipe and having an inner peripheral surface or an inner peripheral surface and a convex shape continuous in a longitudinal direction. The refrigeration apparatus according to claim 1 or 2.