CN100489306C - Compressor - Google Patents

Abstract

The invention provides a compressor with an oil supply pipe that is not easily deformed, high reliability, and low noise, wherein the oil supply pipe (122) includes: a straight line portion (141) arranged parallel to the axis of the eccentric shaft ), and the lower end opening portion (120) is substantially on the inclined portion (143) on the rotation centerline of the main shaft. A slit-shaped gas discharge hole (145) is provided on the side of the inclined portion (143) close to the rotation centerline of the main shaft. In this way, since the rigidity near the lower end opening (120) is very high, the oil supply pipe (122) is not easily deformed, and the eccentricity can also be reduced. Therefore, the agitation effect on the lubricating oil can be suppressed, and the gas inhalation phenomenon is less likely to occur.

Description

compressor

technical field

The present invention relates to improvements in oil supply pipes for supplying lubricating oil to sliding parts of compressors in refrigerators and the like.

Background technique

Some of the existing compressors are also equipped with an oil supply pipe designed to smoothly discharge the gas mixed into the oil supply pipe from the outside and the gas generated inside the oil supply pipe, so that the oil supply performance can be improved (one example can be Refer to Japanese Patent Application Laid-Open No. 8-270562).

Hereinafter, the above-mentioned conventional compressor will be described with reference to the drawings.

Fig. 4 is a side cross-sectional view of the conventional compressor shown in the aforementioned reference document, and Figs. 5 and 6 are partial enlarged views of the conventional compressor. Fig. 7 is a schematic diagram showing the inspection method after the oil supply pipe in the conventional compressor is pressed into the oil supply hole on the rotating shaft.

As shown in Fig. 4, Fig. 5, and Fig. 6, the motor mechanism 2 and the compression mechanism 3 driven by this motor mechanism 2 are elastically installed in the sealed container 1 by a plurality of springs 4, and the bottom of the sealed container 1 Lubricating oil 5 is stored.

The compression mechanism 3 is provided with: a cylinder 10; a member 11 constituting a bearing part 13; a piston 12 installed in the cylinder 10 and reciprocating freely; a main shaft part 15 installed in the bearing part 13 and provided with a spiral groove 14 , and the rotating shaft 17 formed by the eccentric part 16 formed thereunder; the connecting rod 24 connecting the eccentric part 16 and the piston 12; and the oil supply pipe 22 provided with the lower end 18 of the eccentric part.

The motor mechanism 2 is fixed above the component 11 and is composed of a stator 31 provided with a winding 30 and a rotor 32 fixed on the main shaft part 15 of the rotating shaft 17 by means of heat embedding or the like.

The oil supply pipe 22 includes: one end communicates with the spiral groove 14 through the oil supply hole 19 and is pressed into the press-in portion 38 into the oil supply hole 19; a straight line portion 41 arranged parallel to the axis 40 of the eccentric shaft ; and the lower end opening portion 20 is substantially on the rotation center line 42 of the main shaft, and the lower end opening portion 20 extends into the inclined portion 43 in the lubricating oil 5 . In addition, a slit-shaped groove 46 extending upward from the lower end opening 20 is provided on the side of the inclined portion 43 close to the spindle rotation center line 42 .

The operation in the compressor having the above construction will be described below.

When the electric mechanism 2 is energized, the rotor 32 rotates, and the shaft 17 rotates accordingly; the movement of the eccentric part 16 is transmitted to the piston 12 through the connecting rod 24, so that the piston 12 reciprocates in the cylinder 10, and the compression mechanism 3 Specifies the compression operation.

As the shaft 17 rotates, the fuel supply pipe 22 also rotates. In this way, under the action of the centrifugal force in the oil supply pipe 22, the lubricating oil 5 is sucked from the lower end opening 20 of the oil supply pipe 22, and then supplied to each sliding part from the spiral groove 14 through the oil supply hole 19 to lubricate. And the effect of cooling each part.

Here, the refrigerant dissolved in the lubricating oil 5 generates a large number of air bubbles due to the sudden pressure change in the sealed container 1 and the agitation of the oil supply pipe 22 . However, when the air bubbles are sucked into the oil supply pipe 22, they will be separated from the lubricating oil 5 in the oil supply pipe 22 under the action of centrifugal force, and will be concentrated in a part of the main shaft near the rotation centerline 42 due to the difference in specific gravity. side, and discharge from the narrow slot 46. As a result, the decrease in the actual flow path sectional area of the lubricating oil in the oil supply pipe 22, that is, the phenomenon of "gas inhalation" can be prevented, and the lubricating oil 5 can be stably supplied to each sliding member.

In addition, as shown in FIG. 7, in order to check whether the lower end opening portion 20 of the oil supply pipe 22 is on the rotation center line 42 of the main shaft, the usual method is to rotate it around the main shaft portion 15 while moving from the A round pin 50 whose diameter is half the inner diameter of the lower opening 20 is inserted into one side of the lower opening 20 to check the eccentricity with the rotation center line 42 of the main shaft.

However, in the above-mentioned existing structure, since the narrow slit groove 46 extends upward from the lower end opening portion 20, the rigidity of the lower end opening portion 20 will decrease; , the slit grooves 46 will be hooked to each other, and the inner peripheral wall near the slit grooves 46 of the lower opening portion 20 may be deformed, such as in an elliptical shape.

In this way, after deformation of the lower end opening portion 20 side, even after inserting the round pin 50 , the eccentricity with respect to the spindle rotation center line 42 cannot be accurately checked. Therefore, there is a possibility that the actual amount of eccentricity becomes large.

In this way, when the stirring action increases and the amount of air bubbles increases, gas inhalation may occur; in addition, the splashed lubricating oil increased due to the increase in eccentricity will exert vibration on the sealed container 1 and the compression mechanism 3. , there arises a problem that the noise in the high-frequency region increases and the discreteness of the noise increases.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems in the prior art, and its purpose is to provide a low-noise compressor whose oil supply pipe is not easily deformed and has high reliability.

In order to solve the problems in the prior art, the oil supply pipe in the compressor of the present invention is provided with a straight line part parallel to the axis of the eccentric shaft, and an inclined part whose lower end opening is basically on the rotation centerline of the main shaft , At the same time, a slit-shaped gas discharge hole is provided on the side of the inclined part close to the rotation centerline. Therefore, the rigidity near the lower end opening is high, and since there is no slit groove, it is possible to suppress deformation and eccentricity of the fuel supply pipe during the deburring process and assembly process.

The technical effects produced by the present invention are as follows. The compressor of the present invention is provided with an oil supply pipe that is not easily deformed, so a high-reliability low-noise compressor that can reduce the stirring effect on lubricating oil can be provided.

Specific embodiments of the invention are outlined below. In the compressor according to the first aspect of the present invention, a motor mechanism and a compression mechanism driven by the motor mechanism are provided in the sealed container, and lubricating oil is stored in the bottom of the sealed container. The compression mechanism includes: a rotating shaft with a main shaft part and an eccentric part formed below the main shaft part; it is arranged at the lower end of the eccentric part, one end communicates with the oil supply hole of the shaft, and the opening part of the lower end extends into to the oil supply line in the lubricating oil. The oil supply pipe is provided with: a linear portion arranged parallel to the axis of the eccentric shaft; and an inclined portion where the lower end opening is substantially on the rotation center line of the main shaft. A first gas discharge hole in the shape of a slit that is not connected to the lower end opening is provided on a side of the inclined portion that is close to the rotation center line. The side of the rotation center of the linear part is provided with a second gas discharge hole. The refrigerant used is R-600a. The compression mechanism is arranged on the lower part of the sealed container, and the electric mechanism is arranged on the upper part of the sealed container. In this way, since the rigidity near the lower end opening is high, deformation of the oil supply pipe is less likely to occur, and since no narrow slit is provided, deformation of the oil supply pipe during the deburring process and assembly process can be suppressed, and eccentricity can also be reduced. In this way, the stirring action on the lubricating oil can be suppressed and the noise can be reduced. In this way, the bubbled refrigerant gas can be discharged at a more upstream position, so that the reliability is further improved. In addition, even if a refrigerant that is easily dissolved in lubricating oil is used, the gas inhalation phenomenon does not easily occur, so that a highly reliable compressor can be realized.

According to a second aspect, the motor mechanism of the compressor described in the first aspect is driven by an inverter to rotate at a plurality of rotational speeds including at least an operating frequency exceeding a commercial power supply frequency. In this way, even in the high-speed rotation stage where the foaming phenomenon caused by the refrigerant dissolved in the lubricating oil is more significant, the stirring effect on the lubricating oil can be reduced, the noise can be reduced, and the phenomenon of gas inhalation is less likely to occur. Therefore, a highly reliable compressor can be realized.

Description of drawings

Fig. 1 is a side sectional view of a compressor in Embodiment 1 of the present invention,

Fig. 2 is the enlarged schematic view of the partial structure in this embodiment,

Fig. 3 is also an enlarged view of the local main structure in this embodiment,

Fig. 4 is a side sectional view of an existing compressor,

Fig. 5 is an enlarged schematic diagram of a partial structure in an existing compressor,

Fig. 6 is an enlarged schematic diagram of a partial structure in an existing compressor,

Fig. 7 is a schematic diagram showing the inspection method after the assembly of the existing oil supply pipe is completed.

In the accompanying drawings, 101 is a sealed container, 102 is a motor mechanism, 103 is a compression mechanism, 105 is lubricating oil, 115 is a main shaft part, 116 is an eccentric part, 117 is a rotating shaft, 118 is the lower end of the eccentric part, and 119 is a power supply. Oil hole, 120 is the lower end opening, 122 is the oil supply pipe, 136 is the center of the eccentric shaft, 137 is the rotation center of the main shaft, 138 is the gas discharge hole, 141 is the straight part, 143 is the inclined part, 145 is the narrow slit the gas discharge hole.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the technical scope of the present invention is not limited by this embodiment.

Fig. 1 is a side sectional view of the compressor in Embodiment 1 of the present invention, and Fig. 2 and Fig. 3 are enlarged schematic diagrams of the partial structure of the compressor in this embodiment.

As shown in Fig. 1, Fig. 2 and Fig. 3, the motor mechanism 102 and the compression mechanism 103 driven by this motor mechanism 102 are elastically installed in the airtight container 101 by a plurality of springs 104, and the bottom of the airtight container 101 stores There is lubricating oil 105, and R-600a refrigerant (not shown in the figure) is sealed therein.

The compression mechanism 103 is provided with: a cylinder 110; a member 111 constituting a bearing part 113; a piston 112 embedded in the cylinder 110 in a reciprocating manner; And the rotary shaft 117 formed by the eccentric part 116 arranged below it; the connecting rod 124 connecting the eccentric part 116 and the piston 112;

The electric mechanism 102 is fixed above the component 111 and consists of a stator 131 with a winding 130 and a rotor 133 with a magnet 132 inside. In addition, the motor mechanism 102 is driven by a frequency converter circuit (not shown) at a plurality of operating frequencies including operating frequencies exceeding the mains frequency. The rotor 133 is fixed on the main shaft portion 115 in the rotating shaft 117 by means of heat fitting or the like.

One end of the oil supply pipe 122 communicates with the spiral groove 114 through the oil supply hole 119 , and the lower end opening 120 extends into the lubricating oil 105 . At the same time, the oil supply pipe 122 includes: a press-fit part 135 pressed into the oil supply hole 119; a straight line part 141 arranged to be parallel to the axis 136 of the eccentric shaft; Inclined portion 143 on centerline 137 .

In addition, on the side of the inclined portion 143 close to the spindle rotation centerline 137, a slit-shaped gas discharge hole 145 is provided. In addition, a gas discharge hole 138 is provided on the side of the straight portion 141 close to the spindle rotation centerline 137 .

Next, the operation and action of the compressor having the above construction will be described.

When power is supplied from the inverter circuit to the motor mechanism 102, the rotor 133 rotates, and the rotating shaft 117 also rotates accordingly; the movement of the eccentric part 116 is transmitted to the piston 112 through the connecting rod 124, so that the piston 112 reciprocates in the cylinder 110 , so that the compression mechanism 103 performs a predetermined compression operation.

Simultaneously, as the rotation shaft 117 rotates, the fuel supply pipe 122 also rotates. The lubricating oil 105 is sucked from the lower opening 120 of the oil supply pipe 122 under the action of the centrifugal force generated by the oil supply pipe 122, and then supplied to each sliding part from the spiral groove 114 through the oil supply hole 119 to lubricate and smooth the parts. cool down.

Here, the refrigerant dissolved in the lubricating oil 105 generates a large number of air bubbles due to the rapid pressure change in the sealed container 101 and the agitation of the oil supply pipe 122 . In particular, the R-600a refrigerant dissolves in a large amount when dissolved in the lubricating oil 105, and since its specific gravity is smaller than that of the lubricating oil 105, it stays on the surface of the lubricating oil 105. When the compressor is working, the R-600a refrigerant will produce a large amount of foam under the action of the sharp pressure change in the sealed container 101 and the mechanical stirring of the oil supply pipe 122 .

However, the air bubbles sucked into the oil supply pipe 122 will be separated from the lubricating oil 105 in the oil supply pipe 122 under the action of centrifugal force, and will gather on the side close to the rotation center line 137 of the main shaft due to the difference in specific gravity. The slit-shaped gas discharge hole 145 discharges. In this way, the reduction of the actual cross-sectional area of the lubricating oil in the oil supply pipe 122, that is, the phenomenon of gas inhalation can be prevented, and the lubricating oil 105 can be stably supplied to each sliding part.

In addition, for the air bubbles that occur later in the oil supply pipe 122 and are not discharged from the slit-shaped gas discharge hole 145 but are sucked into the straight portion 141 together with the lubricating oil through the inclined portion 143 by centrifugal force For the air bubbles, they will be separated from the lubricating oil 105 under the action of centrifugal force in the oil supply pipe 122, and will gather on the side close to the rotation centerline 137 of the main shaft due to the difference in specific gravity, and will be discharged from the gas discharge hole 138. In this way, the occurrence of the gas inhalation phenomenon can be more reliably prevented.

As a result, lubricating oil 105 can be stably supplied to each sliding portion, thereby realizing high reliability.

In particular, even when rotating at a low speed lower than the frequency of the commercial power supply, although the centrifugal force of the oil supply pipe 122 decreases and the amount of lubricating oil supplied decreases, the above-mentioned gas suction phenomenon can be prevented and stable oil supply can be realized. , achieving high reliability.

In addition, since the inner peripheral wall surface of the lower opening portion 120 side of the inclined portion 143 has a cylindrical shape connected with each other, not only can the vicinity of the lower opening portion 120 of the inclined portion 143 maintain high rigidity, but also the The oil supply pipes 122 are not hooked to each other during the deburring process of the pipes and the assembly process, and unnecessary force is not applied near the lower end opening 120, so that deformation can be suppressed and agitation of the lubricating oil can be reduced.

On the other hand, the eccentricity inspection of the oil supply pipe 122 can be performed more reliably by suppressing the deformation occurring near the lower end opening portion 120, so that the eccentricity of the oil supply pipe 122 can be prevented and the agitation of lubricating oil can be reduced.

As a result, it is possible to prevent the splashed lubricating oil from vibrating the airtight container 101 and the compression mechanism 103, increasing the noise in the high-frequency region, and increasing the discreteness of the noise. In addition, since the gas suction phenomenon does not easily occur, a compressor with low noise and high reliability can be realized. Especially, when rotating at a high speed exceeding the frequency of the commercial power supply, the agitation effect of the oil supply pipe 122 will increase, and the effect will be more significant.

In addition, although the example in which the refrigerant is R-600a was given in this embodiment, the present invention is also effective for refrigerants such as other HC refrigerants, HCFC, HFC, and CO ₂ .

In summary, since the oil supply pipe of the compressor in the present invention is not easy to deform, it can reduce the stirring effect on the lubricating oil and provide a compressor with high reliability and low noise, so it can not only be used in refrigerators, It can also be used in vending machines, refrigerated display cabinets, dehumidifiers and other equipment.

Claims (2)

1. A compressor, characterized in that: a motor-driven mechanism and a compression mechanism driven by the motor-driven mechanism are arranged in the sealed container, and at the same time, lubricating oil is accumulated in the bottom of the sealed container, The compression mechanism includes: a rotating shaft with a main shaft part and an eccentric part formed below the main shaft part; it is arranged at the lower end of the eccentric part, one end communicates with the oil supply hole of the shaft, and the opening part of the lower end extends into to the oil supply line in the lubricating oil, The oil supply pipe is provided with: a linear portion arranged parallel to the axis of the eccentric shaft; and an inclined portion where the lower end opening is substantially on the rotation centerline of the main shaft, A first gas discharge hole in the shape of a slit not connected to the opening at the lower end is provided on the side of the inclined portion close to the center line of rotation, The rotation center side of the linear part is provided with a second gas discharge hole, The refrigerant used is R-600a, The compression mechanism is arranged on the lower part of the sealed container, and the electric mechanism is arranged on the upper part of the sealed container. 2. The compressor according to claim 1, wherein the motor mechanism is driven by a frequency converter to rotate at a plurality of rotational speeds at least including an operating frequency exceeding the frequency of the commercial power supply.

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