KR810001947B1 - Noise dampening means in refregeration moter-compressor unit - Google Patents

Abstract

A motor compressor unit(10) is resiliently mounted within a shell(11) defining a lubricating oil sump(39). The compressor(17) includes a primary oil pump having its inlet submerged in the oil sump(39) to pump the oil to lubricate various compressor components. A secondary oil pump has its inlet in fluid flow communication with the oil sump(39).

Description

Refrigeration Motors-Compressor Units

1 is a longitudinal sectional view of a motor-compressor unit in which the present invention is implemented.

2 is a partially enlarged sectional view taken along line II-II of FIG. 3 showing the motor-compressor unit showing the present invention in detail.

3 is a cross-sectional view taken along the line III-III of FIG.

The present invention relates to a device for removing noise generated by a cooling device, in particular a motor-compressor of the cooling device.

Coolers used in domestic air conditioning systems are for example occupied areas where well-known indoor air conditioning units are installed through windows or walls or motor-compressor units and condensers are fitted in conventional housings. It is usually located in a given area, such as "splitting systems" that are installed on outdoor concrete slabs or similar structures. As is well known, it is important that the generation of noise in such air conditioning systems be limited.

If the facility produces noise, it is evident that undesired noise occurs in the space occupied by such a facility, or, when installed outdoors, causes disturbances not only to the owner but also to neighboring neighbors of the air conditioning system.

As is known, motor-compressor units of the type typically used in air conditioning plants of the type described below are one of the main sources of noise generated by the plants. Compressors used to generate high refrigerant gas are all made up of many moving parts that produce noise. Representatively, in the unit of the type described below, the motor-compressor unit is elastically hung on a closed shell. In order to save on manufacturing costs, the size of the shell is continually reduced so that a suitable portion on the compressor unit is placed in the sump determined by the inner surface of the shell. It has been found that lubricating oil acts as a transmission medium for the noise generated in the motor-compressor unit, and in fact, such noise is transmitted to the shell by the oil and radiated out there.

To reduce the oil's ability to deliver oil, many devices have previously been used to aerate or agitate oil. For example, US Pat. No. 2,990,111 discloses a mechanical stirrer mounted below an oil surface in an oil sump. . The stirrer agitates the oil to bubble there to reduce its ability to deliver oil. In US Pat. No. 3,066,857, a portion of the compressed gas is passed around the piston and is also delivered to the lubricant through a suitable passage. The high pressure refrigerant gas bubbles oil and thereby reduces the oil's ability to transmit noise. Another example of the prior art is disclosed in US Pat. No. 3,147,914, where the rotor of the motor is submerged in oil and the oil is agitated as the rotor rotates. Some of the examples described above all have general features. Each of the prior patents agitates the oil to generate bubbles in the oil that attempt to reduce the noise transmission capacity of the oil. However, conventional devices have not been completely satisfactory for several reasons.

For example, by stirring or stirring the oil in the method disclosed in US Pat. No. 2,990,111, particles of impurities typically found at the bottom of the sump flow around and are sometimes found in the inlet passage of the lubricating oil pump. This resulted in impurities entering the bearing and shortening the life of the bearing.

Referring to the device disclosed in U.S. Patent No. 3,066,857, it was found that the foam was insufficiently distributed to the entire oil only by allowing the refrigerant gas to pass through the piston. Moreover, because the amount of passing gas is not constant due to manufacturing tolerances, a sufficient amount of foam is not always formed in the oil.

It is therefore an object of the present invention to reduce the noise of the cooling motor-compressor unit.

Another object of the present invention is to agitate the oil provided in the sump of the motor-compressor unit to reduce the noise transmission capacity of the oil.

Another object of the present invention is to stir the oil in such a way that it can prevent the interference of impurities usually found at the bottom of the sump.

It is another object of the present invention to distribute the stirred oil and refrigerant gas throughout the entirety to block the noise transmission path from the noise source to the outside of the shell.

It is another object of the present invention to implement the above without substantially increasing the manufacturing cost of the motor compressor unit.

It is another object of the present invention to provide an apparatus for removing the noise generated by the motor-compressor unit without adversely affecting the operation of the periodic pump used in the compressor lubrication system.

These and other objects of the present invention are achieved in a motor-compressor unit which is elastically suspended in a shell defining a lubrication barrel. The compressor includes a periodic pump with an inlet in the sump, which pumps oil to smooth out several compressor components. The sub oil pump has an inlet in fluid flow relation with the sump, and the sub oil pump agitates the oil to separate the introduced refrigerant gas. The separated gas and stirred oil are moved radially outwardly through the oil stored in the bin to uniquely remove the noise transmitted from the compressor surrounding surface.

Referring to the drawings, a sealed motor-compressor unit for implementing a noise reduction system according to the invention is shown, wherein the motor-compressor unit of the illustrated type is typically employed in a mechanical cooling unit.

The sealed motor-compressor unit is generally indicated at 10, the units being elliptical in cross section and housed in a shell generally indicated at 11, the shell 11 being joined to the lower 14 and the upper 12 by welding or the like. The electric motor 15 and the compressor 17 are arranged in the shell 11, and the compressor 17 is aligned with the motor 15 in the axial direction and disposed below it.

Motor 15 includes a stator 18 and a rotor 20, the rotor being coupled to drive the crankshaft 22. The crankshaft is supported in cylinder block 24 of compressor 17, which determines the cylinder 27 of the compressor. Cylinder heads 26 and 28 are secured to the cylinder block with bolts 25 and provided to close the ends of the cylinders. The pistons 46 are arranged to reciprocate in the cylinder 27 and the number of cylinders can be increased or decreased as needed. Each piston is connected to the eccentric part of the crankshaft 22 with a connecting rod 42 and a piston pin 44.

Sealed motor-compressor units embodying the present invention are typically used in mechanical cooling units of the type generally used in air conditioning systems. The refrigerant gas to be compressed enters the shell of the compressor via inlet 29, which passes through inlet 29 and screen 31 and then flows the winding of motor 15 to cool in a manner well known in the art. Screen 31 is included to remove any undesirable debris that may be loaded onto the incoming refrigerant gas.

The refrigerant gas cools the windings of the motor and then enters the compressor portion of the unit via inlets 30 and 32 arranged on top of the cylinder heads 26 and 28. The refrigerant gas flows into each of the cylinders 27 of the compressor via a suction port (not shown) formed in the valve plate 33. After being compressed by the action of the piston, the gas enters the appropriate part of the cylinder head through outlets 48 formed in the valve plate 33. Drain valve 49 is coupled to plate 33 and regulates the flow of gas from the cylinder.

The discharged high pressure gas passes through the inner hole of the cylinder block in the manner described fully in US Pat. No. 3,785,453. Undesired noise caused by the pulsation of the exhaust gas can also be dampened by directing the gas through the holes in the cylinder block, which then connects the outlet outlet 70 with compressed gas to other components of the cooling unit. Flow through discharge line 34 provided for delivery.

Lubricants for lubricating many compressor components are stored in the sump 39 of the compressor, and it is generally desirable to store the cylinder block and the heads 26,28 attached to it, since it is desirable to keep the motor-compressor unit as small as possible. Will be partially locked. The sump 39 is determined by the inner wall of the lower shell 14, and the oil pick-up tube 38 is immersed in the sump so that the inlet is below the oil surface. The tube is pressurized into a bottomed titration hole in the crankshaft 22 and through a titration opening in the thrust bearing 41. The thrust bearing is fixed to the bottom of the cylinder block 24 by a titration device such as bolt 52. During normal operation, the rapid rotation of the tube by the rotation of the crankshaft generates a vacuum at the inlet of the tube, which leads to the inlet of the tube. Oil is inhaled The crankshaft 22 is provided in communication with the upper end of the tube 38 and has an internally eccentric passage 55 (shown in FIG. 2), and the centrifugal force generated as the oil passes through the rotating eccentric passage 55 passes the oil through the passage. Provide the force needed to move. The feed hole 50 was connected to the bearing surfaces 43 and 49 by an eccentric oil passage, and oil grooves 47 (FIG. 1) were provided on the outer surface of the crankshaft 22 to distribute the lubricant evenly on the bearing surface.

As previously recognized, the lubricant stored in the sump acts as a transmission medium for noise generated by the movement of a number of compressor components, which is transmitted through the oil to the sealed shell 11 and spread out therefrom. I'm going. It is evident that the noise emission from the motor compressor unit is very undesirable when the cooling unit is used as an air conditioning system to provide air in the occupied space. To date, many designs have been designed to reduce the oil's ability to transmit the generated noise to the outer seal shell.

Referring to Figures 2 and 3, the present invention will be described in detail as follows. The present invention provides a novel device for removing the noise transmitted by the oil from the motor-compressor unit to the surrounding shell.

In particular, the Thrust Washer 41 comprises an annular opening 58 arranged concentrically with respect to the oil pick-up tube 38, and the crankshaft 22 is a radially extending slot in fluid flow with the annular opening 58. slot 60). The annular flow opening 58 is locked in the sump 39. The thrust washer 41 suitably has an annular groove 62, which is aligned perpendicular to the outer end 64 of the radially extending slot 60.

In operation, slot 60 is combined with opening 58 to determine the auxiliary lubricant pump. A portion of the oil stored in the sump 39 flows upward through the annular opening 58 and passes through the center of the radial slot 60. The rotating crankshaft 22 centrifugally radially outflows the oil through slot 60 so that the centrifuged oil is very stirred. The rotating crankshaft 22 directs the oil radially through the slot 60 so that the centrifugal force generated causes the heavy oil to be separated from the light refrigerant gas. Stirring the oil and the refrigerant gas causes the refrigerant to foam.

The separated oil and refrigerant gases come and flow directly into the grooves 62 formed in 41, thereby distributing radially outward into the oil stored in the sump 39. Stirred oil and foamed refrigerant gas create bubbles in the oil, which are generally scattered over the oil because the oil or gas is discharged radially from the distribution groove 62.

Since much of the cylinder block or cylinder head is immersed in oil, bubbles generally surround all surfaces of the compressed compressor and, as is well known, the formation of bubbles in oil reduces the oil's ability to transmit noise. Let's do it.

By radially distributing the agitated oil and the separated gas through the oil in the sump 39, it reduces the transmission of noise generated by the operation of the discharge and intake valves and in the past transmitted from the cylinder head to the shell 11 through the oil. A significant amount of bubbles surround the cylinder head to make it.

Furthermore, by providing an inlet to the auxiliary oil pump at the top of the oil in the sump 39, it is generally not interrupted by debris that has settled at the bottom of the sump 39 or foreign-invasive impurities. By remaining, it does not enter the inlet of the pick-up tube 38 and the annular opening 58. It is also clear that it is very undesirable for impurities such as debris to be sucked together with lubricating oil into the lubrication system or noise reduction system of the present invention.

Referring also to Figures 2 and 3, it is desirable to further increase the agitation of the oil discharged into the distribution groove 62 to increase the amount of bubbles generated in the oil, the fact of which is achieved by providing a passage 66. Passage 66 communicated with oil 27 and gas discharged from slot 60 into cylinder 27. Due to the manufacturing error provided between the piston ring and the cylinder wall 27, the high pressure refrigerant gas bypassing the piston 46 passes through the passage 66, which pressurizes the oil discharged from the slot 60 to increase the bubbles generated in the stored oil. Stir further. The passage 66 may be directly aligned with the distribution groove 62 or may include a connection passage 68 aligned with the outer end 64 of the slot 60, as shown. If connection passage 68 is included, the bottom of passage 66 will be blocked by a suitable device. The noise reduction system of the present invention has proved to be very effective in reducing the noise transmitted by the oil stored in the sump 39, and is relatively inexpensive since only a few holes are required to provide the auxiliary pump.

As the preferred embodiments of the present invention have already been described in detail in conjunction with the drawings, the implementation of the present invention may be variously modified without departing from the spirit of the following claims.

Claims (1)

A shell for determining the sump, an oil source arranged in the sump, a rotatable crank side extending in the axial direction and a motor-compressor unit elastically mounted in the shell and a thrust washer disposed under the crankshaft A refrigeration apparatus comprising an oil pick-up tube fixed to the crankshaft for rotation and extending from the surface of the thrust washer extending through the center hole of the thrust washer into the oil source and determining the central hole. A gap 58 is formed between the pickup tube 38 and the hole of the thrust washer 41 to communicate with the slot 60 installed between the crankshaft 22 and the thrust washer 41. The noise canceling station of the refrigeration motor-compressor, characterized in that the passage is configured to lead to the distribution groove 62 so as to radially distribute the refrigerant and oil by stirring. Chi.

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