KR20080045558A - Hermetic type compressor - Google Patents

Abstract

A hermetic compressor is provided to prevent an increasing of suction load pressed to a driving unit and compression unit and to prevent that liquid refrigerant is introduced into the suction muffler to a compression chamber at the initial starting or restarting time of the compressor. A hermetic compressor includes a pressure control unit mounted at a side of a suction muffler. The pressure control unit has a body part(61) formed with an inlet and a hole(81), a refrigerant guide pipe extended into the body part by predetermined length for guiding the refrigerant, which is guided into the body part, into a compression unit, an opening/closing element(82) coupled at a side of the hole by a hinge(84) for opening or closing the hole by rotational motion, and an elastic element(83) such as a twist coil spring for supporting the opening/closing element elastically in the closing direction of the hole.

Description

Hermetic Compressor {HERMETIC TYPE COMPRESSOR}

1 is a cross-sectional view showing the overall structure of a hermetic compressor according to an embodiment of the present invention.

Figure 2 is a perspective view showing the structure of a suction muffler according to an embodiment of the present invention.

Figure 3 is an exploded perspective view showing the structure of the pressure regulator according to an embodiment of the present invention.

Figure 4 is a cross-sectional view showing the operating state of the pressure regulating device according to an embodiment of the present invention, showing a state in which the hole forming the pressure regulating device is open.

Figure 5 is a cross-sectional view showing an operating state of the pressure regulating device according to an embodiment of the present invention, showing a closed state of the hole forming the pressure regulating device.

Explanation of symbols on the main parts of the drawings

50: suction muffler 60: main body

60a: suction port 61: upper body

62: lower body 70: refrigerant guide tube

80: pressure regulator 81: hole

81a: step 82: opening and closing member

83: elastic member 84: hinge shaft

81b, 82a: through hole

The present invention relates to a hermetic compressor, and more particularly, to improve the structure of the suction muffler, to suppress the suction of the liquid refrigerant into the compression chamber and to provide the compression unit and the compression power of the refrigerant to perform the compression action of the refrigerant. It relates to a hermetic compressor provided to prevent excessive suction load is applied to the copper unit.

In general, the hermetic compressor is employed in a refrigeration cycle of a refrigerator or an air conditioner to compress a low temperature low pressure refrigerant received from an evaporator of a refrigeration cycle to a state of high temperature and high pressure to be delivered to a refrigeration cycle condenser. In the sealed container, a suction tube for guiding the evaporator-side refrigerant into the sealed container and a discharge tube for guiding the refrigerant compressed in the sealed container toward the condenser are respectively provided.

In addition, a compression unit for compressing the refrigerant and a driving unit for providing a compression driving force of the refrigerant are installed in the sealed container.

The compression unit includes a cylinder in which a compression chamber is formed, a piston installed inside the compression chamber to linearly reciprocate by driving of the drive unit, and a refrigerant discharge chamber coupled to the cylinder to seal the compression chamber and associated with the discharge pipe. A valve head interposed between the cylinder suction head and the refrigerant suction chamber associated with the suction pipe, and a valve device interposed between the cylinder and the cylinder head to control the flow of the refrigerant sucked into the compression chamber from the refrigerant suction chamber or discharged from the compression chamber to the refrigerant discharge chamber. Equipped.

When the piston is linearly reciprocated in the compression chamber by the driving unit through such a structure, a pressure difference is formed between the inside and the outside of the compression chamber, and the pressure difference causes the refrigerant of low temperature and low pressure passing through the evaporator of the refrigeration cycle. The refrigerant is sucked into the compression chamber through the suction pipe and the refrigerant suction chamber and compressed, and the refrigerant having a high-temperature design compressed and discharged from the compression chamber is supplied to the condenser of the refrigerating cycle through the refrigerant discharge chamber and the discharge tube.

On the other hand, a suction muffler is installed between the suction pipe and the refrigerant suction chamber to reduce the flow noise of the suction refrigerant which is usually sucked into the compression chamber. The suction muffler includes a main body having a suction port formed at one side thereof so that the suction pipe is connected, and a refrigerant guide tube having an outlet for discharging the refrigerant at the other end of which one end having an inlet formed extends a predetermined length into the main body and extends outside the main body. The suction muffler is installed such that an end of the refrigerant pressure inner tube at the outlet side is inserted into the refrigerant suction chamber of the cylinder head.

Therefore, the refrigerant guided into the sealed container along the suction pipe during the compression action of the compression unit according to the driving of the drive unit is sucked into the compression chamber through the refrigerant suction chamber in a state in which the pulsation is reduced while being introduced into the main body of the suction muffler. do.

On the other hand, when the sealed compressor is stopped for a predetermined time or restarted, such as when the compressor is initially started or restarted, the high-pressure side and the low-pressure side of the refrigeration cycle are in equilibrium, and the liquid refrigerant in the refrigerant flowing into the hermetic compressor. When the amount of the liquid refrigerant is sucked into the compression chamber together with the refrigerant in the gaseous state and is compressed, the compression efficiency of the refrigerant by the hermetic compressor is reduced and the cooling efficiency of the refrigerating cycle is reduced. In addition, the problem of degradation occurs.

In addition, when such a large amount of liquid refrigerant is delivered to the suction muffler, the load on the compression unit for sucking the suction unit and the driving unit for driving the compression unit increases, increasing the noise of the hermetic compressor and increasing the amount of power loss. In the conventional hermetic compressor, the suction muffler is configured to guide such a large amount of liquid refrigerant to the refrigerant suction chamber together with the refrigerant in the existing state, so that the refrigerant is compressed during initial startup and restart. As efficiency decreases, noise increases and power is excessively wasted.

The present invention is to solve such a problem, an object of the present invention is to improve the structure of the suction muffler to suppress the suction of the liquid refrigerant into the compression chamber and at the same time the compression unit and the refrigerant to perform the compression action of the refrigerant It is to provide a hermetic compressor provided to prevent the excessive suction load is applied to the drive unit that provides the compression power of.

The hermetic compressor according to the present invention for achieving the above object is provided to suck and compress the sealed container forming the appearance, the suction pipe for guiding the evaporator side refrigerant of the refrigeration cycle into the sealed container, and the refrigerant inside the sealed container. A compression unit, a drive unit providing a compression driving force to the compression unit, a suction muffler provided to guide the refrigerant guided into the sealed container along the suction pipe to the compression unit in a state where the pulsation is reduced, and the suction muffler inside It characterized in that it comprises a pressure adjusting device provided in the suction muffler to maintain the pressure of the constant.

The suction muffler includes a main body having a suction port formed at one side thereof, and a refrigerant guide tube configured to extend a predetermined length into one end of the main body to guide the refrigerant guided into the main body to the compression unit. And a hole formed in one side of the main body, an opening and closing member installed to be opened and closed in the hole, and an elastic member provided to elastically support the opening and closing member in a direction of closing the hole.

In addition, the opening and closing member is hinged to one end of the hole is characterized in that it is provided to open and close the hole by the rotation operation.

The pressure regulating device may further include a hinge shaft penetrating one end of the opening / closing member and coupled to the life saving suction muffler main body, and the elastic member is wound around the rotating shaft, and one end and the other end are respectively in the hole-side main body. And it characterized in that it comprises a torsion coil spring supported on the outer surface of the opening and closing member.

In addition, the hole is characterized in that formed in the main body of the position proximate to one end of the refrigerant guide tube extending into the main body.

In addition, the hole is characterized in that the step is formed so as to limit the flow of the opening and closing member in the hole during the closing operation of the opening and closing member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The hermetic compressor according to the present embodiment forms an exterior through the hermetic container 1 as shown in FIG. 1, and on one side and the other side of the hermetic container 1, the evaporator side refrigerant of the refrigeration cycle is introduced into the hermetic container 1. The guide suction pipe 2 and the discharge pipe 3 for guiding the refrigerant compressed in the sealed container 1 toward the condenser of the refrigerating cycle are respectively provided.

In addition, the inside of the sealed container 1 is provided with a compression unit 10 for performing a compression action of the refrigerant, and a drive unit 20 for providing a compression driving force of the refrigerant, such a compression unit 10 and the drive unit 20 is installed through the frame 30.

In the center of the frame 30, a rotating shaft 40 for transmitting the driving force of the drive unit 20 to the compression unit 10 is rotatably installed, the drive unit 20 is in the upper outer portion of the frame 30 The stator 21 is installed to be fixed, and the rotor 22 is installed to rotate in an electrical interaction with the stator 21 inside the stator 21. Here, the upper rotating shaft 40 of the frame 30 is pressed into the center of the rotor 22 to rotate together with the rotation of the rotor 22, the rotating shaft 40 extending below the frame 30 An eccentric shaft portion 41 is formed at the bottom of the eccentric rotation.

In addition, the compression unit 10 is a cylinder (11) provided on one side of the lower side of the frame 30 to form a compression chamber (11a), and the piston 12 is installed in the compression chamber (11a) to enable a linear reciprocating motion And a cylinder head 13 having a refrigerant suction chamber 13a and a refrigerant discharge chamber 13b which are coupled to one end of the cylinder 11 and partitioned so as to seal the compression chamber 11a, and the cylinder 11; And a valve device interposed between the cylinder head 13 and intermittent to flow the refrigerant sucked into the compression chamber 11a from the refrigerant suction chamber 13a or discharged from the compression chamber 11a to the refrigerant discharge chamber 13b ( 14, the piston 12 is connected to the eccentric shaft portion 41 and the connecting rod 15 of the rotary shaft 40.

In addition, the suction muffler 50 for reducing the noise of the refrigerant sucked into the compression chamber 11a by reducing the pressure pulsation of the refrigerant flowing into the refrigerant suction chamber 13a between the refrigerant suction chamber 13a and the suction pipe 2. ) Is installed, and the suction muffler 50 has a main body 60 having a suction port 60a formed at one side thereof so that the suction pipe 2 is connected as shown in FIG. It is provided with a refrigerant guide tube 70 having a predetermined length extending into the main body 60 and an outlet 72 for discharging the refrigerant at the other end extending outside the main body 60.

The main body 60 is formed by coupling the upper body 61 and the lower body 62 to each other, and the suction muffler 50 is formed in the outlet of the internal refrigerant pressure tube 70 outside the main body 60. One end is installed to be inserted into the refrigerant suction chamber 13a of the cylinder head 13, and the suction pipe 2 is coupled to the suction port 60a with the coil spring 4 interposed therebetween.

When the eccentric shaft portion 41 is eccentrically rotated by the rotational movement of the rotary shaft 40 according to the driving of the drive unit 20 through this structure, the piston connected through the eccentric shaft portion 41 and the connecting rod 15 ( As the 12 is linearly reciprocated in the compression chamber 11a, a pressure difference is formed between the inside and the outside of the compression chamber 11a. Therefore, the refrigerant guided along the suction pipe 2 from the evaporator through the pressure difference is diffused while passing through the main body 60 of the suction muffler 50 to the refrigerant suction chamber 13a in a state where pulsation is reduced. The refrigerant introduced into the refrigerant suction chamber 13a is continuously sucked into the compression chamber 11a and compressed, and the refrigerant compressed in the compression chamber 11a is discharged into the refrigerant discharge chamber 13b and then the It is delivered to the condenser of the refrigeration cycle outside the sealed container 1 along the discharge pipe (3).

On the other hand, when the sealed compressor is stopped for a predetermined time or restarted, such as when the compressor is initially started or restarted, the high-pressure side and the low-pressure side of the refrigeration cycle are in equilibrium, and the liquid refrigerant in the refrigerant flowing into the hermetic compressor. When the amount of the liquid refrigerant is sucked into the compression chamber 11a together with the refrigerant in the gaseous state and is compressed, the compression efficiency of the refrigerant by the hermetic compressor is reduced and the compression cycle of the refrigeration cycle is reduced. Cooling efficiency is also lowered, and in the state where such a large amount of the liquid refrigerant is delivered to the suction muffler 50, the compression unit 10 for suctioning the liquid refrigerant and the driving unit 20 for driving the compression unit 10 are provided. As the load on the load increases, the noise of the hermetic compressor increases and the power loss increases.

Therefore, in the hermetic compressor according to the present embodiment to solve this problem, the pressure control device 80 to maintain a constant state of the pressure inside the suction muffler 50 at one side of the main body 60 of the suction muffler 50 at all times. Is provided, the pressure regulating device 80 is a hole 81 formed to penetrate one side of the upper body 61, the opening and closing member 82 is installed to open and close the hole 81, and the opening and closing member And an elastic member 83 provided to elastically support 82 in the direction of closing the hole 81.

The opening and closing member 82 is provided in a plate shape of a predetermined size and is hinged to the upper body 61 on one end of the hole 81 so as to be opened and closed to open and close the hole 81 through a rotational operation. Step 81 is formed in the 81 so that the opening and closing member 82 is supported to support the opening and closing member 82 closing the hole 81, the opening and closing member 82 is such a step in the closing operation It is restricted to flow into the hole 81 through the 81a.

In addition, through-holes 82a and 81b are formed in one end of the opening member 82 and the upper end body 61 of the hole 81 corresponding to the opening and closing member 82, respectively. The member 82 is rotated based on the hinge shaft 84 fastened to the through holes 81b and 82a. In this embodiment, the torsion coil spring is employed as the elastic member 83.

In order to install the elastic member 83, one end of the opening and closing member 82 corresponding to the middle of the hinge shaft 84 is formed with an incision 82b to expose the hinge shaft 84, and is employed as the torsion coil spring. One end and the other end of the elastic member 83 is wound around the hinge shaft 84 toward the cutout portion 82b, and the inner surface of the upper body 61 and the outer surface of the opening and closing member 82, respectively. It is installed to be supported on. Accordingly, the opening and closing member 82 is elastically supported in the direction of closing the hole 81 through the elastic member 83, and is supported by the stepped portion 81a in the closed state of the hole 81, and the hole 81 is supported. Will remain closed.

Therefore, when the amount of liquid refrigerant flowing into the suction muffler 50 is excessively increased and the internal pressure of the suction muffler 50 is increased to a predetermined value or more, the opening and closing member 82 may be opened. When the weight of the) and the elastic force of the elastic member 83 is set, when the amount of the refrigerant in the liquid state flowing into the suction muffler 50 increases while the internal pressure of the suction muffler 50 rises above a predetermined value, the suction The opening / closing member 82 is opened and closed by the internal pressure of the muffler 50. Accordingly, a considerable amount of the liquid state refrigerant among the refrigerant introduced into the main body 60 through the suction port 60a is passed through the hole 81. It is discharged into the sealed container (1).

Therefore, through the pressure regulating device 80, the hermetic compressor according to the present embodiment is suppressed from being sucked into the compression chamber 11a of the excessive liquid state or transferred to the condenser of the refrigerating cycle, while the compression efficiency of the refrigerant is lowered. Of course, it is possible to effectively prevent the cooling efficiency of the refrigeration cycle is lowered.

In the state in which the pressure regulating device 80 is operated, even when an excessive amount of the liquid refrigerant is transferred into the suction muffler 50 during the initial startup and restart of the hermetic compressor, the operation of the pressure regulating device 80 is performed. Since most of the liquid refrigerant is discharged into the sealed container 1 along the hole 81, the increase in the pressure inside the suction muffler 50 is suppressed, and thus a compression unit for sucking the refrigerant of the suction muffler 50 ( 10) or the load applied to the drive unit 20 for driving the compression unit 10 is also not excessively increased, thereby suppressing an increase in the noise of the hermetic compressor and at the same time not increasing the amount of power loss.

In addition, the refrigerant introduced into the suction muffler 50 along the suction port 60a is first introduced into the refrigerant guide tube 70 in a state where the pulsation is reduced by being diffused into the main body 60 and the outlet 72. Through the inlet to the refrigerant suction chamber (13a), a small gap is formed between one end of the refrigerant guide tube 70, the inlet 71 is formed and the inner wall of the upper body 61, the flow rate of the refrigerant compared to other parts The hole 81 is formed in the upper body 61 in a position close to one end of the refrigerant guide tube 70 toward the inlet 71 in which a strong flow rate is formed. It is desirable to allow the refrigerant to be discharged more smoothly through the hole 81.

4 and 5 shows the operation of such a pressure regulating device (80).

First, as shown in FIG. 4, at the initial startup or restart of the hermetic compressor, the amount of the refrigerant in the liquid state is excessively included in the refrigerant guided from the evaporator side of the refrigeration cycle to the suction muffler 50 along the suction pipe 2. In this state, the internal pressure of the suction muffler 50 is increased. In this state, the opening / closing member 82 is rotated to the outside by the internal pressure of the suction muffler 50, and the hole 81 is opened. The opening angle of the hole 81 is increased in proportion to the pressure inside the suction muffler 50.

Therefore, at this time, most of the liquid refrigerant in the liquid state of the refrigerant introduced into the main body 60 of the suction muffler 50 along the suction port 60a is discharged into the sealed container 1 along the open hole 81 and is in a liquid state. The refrigerant is sucked into the compression chamber (11a) or delivered to the condenser of the refrigeration cycle is effectively suppressed, the load applied to the compression unit 10 or the drive unit 20 is also not increased.

In this state, when the driving of the hermetic compressor continues for a predetermined time or more and the amount of the liquid refrigerant decreases, and the pressure inside the suction muffler 50 falls below a predetermined value, the opening and closing member 82 is the elastic member 83. Rotating toward the hole 81 through the elastic restoring force to close the hole 81, and thus the refrigerant introduced into the main body 60 through the suction port 60a is all along the refrigerant guide tube 70. It flows into the refrigerant suction chamber 13a and is delivered to the compression chamber 11a.

At this time, the liquid refrigerant discharged into the sealed container 1 through the hole 81 at the initial startup and restart of the sealed compressor is vaporized while the temperature inside the sealed container 1 rises. 4) is re-introduced into the suction muffler 50 and guided to the refrigerant suction chamber 13a together with the refrigerant guided along the suction pipe 2.

As described above in detail, the hermetic compressor according to the present invention is provided with a pressure regulating device to maintain a constant state of the pressure inside the suction muffler on one side of the suction muffler at all times. When excessive amount of liquid refrigerant flows into the suction muffler such as when restarting, if the pressure inside the suction muffler increases, most of the liquid refrigerant flowing into the suction muffler is discharged into the sealed container while the pressure inside the suction muffler is increased. Keep it constant at all times. Therefore, the hermetic compressor according to the present invention can effectively prevent the liquid refrigerant from being sucked into the compression chamber and delivered to the condenser of the refrigeration cycle during the initial startup and restart, and the suction load applied to the compression unit and the driving unit is increased. It can also prevent.

Claims (6)

A sealed container forming an external appearance, a suction pipe for guiding a refrigerant in the evaporator side of the refrigerating cycle into the sealed container, a compression unit provided to suck and compress the refrigerant inside the sealed container, and a drive for providing a compression driving force to the compression unit. A suction muffler provided to guide the unit, the refrigerant guided into the sealed container along the suction pipe to the compression unit in a state where the pulsation is reduced, and a pressure provided to the suction muffler to maintain a constant pressure inside the suction muffler. A hermetic compressor comprising a regulating device. The method of claim 1, The suction muffler includes a main body having a suction port formed at one side thereof, and a refrigerant guide tube having one end extended to a predetermined length into the main body to guide the refrigerant guided into the main body to the compression unit. The pressure regulating device includes a hole formed on one side of the main body, an opening and closing member provided to open and close the hole, and an elastic member provided to elastically support the opening and closing member in the direction of closing the hole. compressor. The method of claim 2, The opening and closing member is hinged to one end of the hole is a hermetic compressor characterized in that it is provided to open and close the hole by the rotation operation. The method of claim 3, wherein The pressure regulating device further includes a hinge shaft penetrating one end of the opening / closing member and coupled to the life saving one side suction muffler body, wherein the elastic member is wound around the rotating shaft and has one end and the other end inside the body toward the hole. A hermetic compressor comprising a torsion coil spring supported on an outer surface of the opening and closing member. The method of claim 2, And the hole is formed in the main body at a position proximate to one end of the refrigerant guide tube extending into the main body. The method of claim 2, Hermetic compressor is characterized in that the step is formed in the hole to limit the flow of the opening and closing member in the opening during the closing operation of the opening and closing member.

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