KR20080000996A - Hermetic type compressor - Google Patents

Abstract

A hermetic compressor is provided to prevent refrigerant from flowing inversely from a resonance space of a suction muffler for attenuating the low frequency noise generation and reduce an amount of the refrigerant discharged via a suction valve for improving the capacity of the compressor. A hermetic compressor includes a backflow preventing valve mounted on a connection path(65) between a resonance space of a suction muffler and a refrigerant suction chamber for preventing backflow of refrigerant from the resonance space of the suction muffler to the refrigerant suction chamber. The backflow preventing valve has a lead valve(81) opening or closing the connection path, and a stopper(86) for limiting the movement of the lead valve to open the lead valve in the direction toward the compression chamber.

Description

Hermetic Compressor {HERMETIC TYPE COMPRESSOR}

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

Figure 2 is an exploded perspective view of the suction muffler installed in Figure 1;

3 is a cross-sectional view before assembling the suction muffler of FIG.

4 is a cross-sectional view after the suction muffler of FIG. 2 is assembled.

** Explanation of symbols for main parts of drawings **

10: case 11: suction tube

12: discharge tube 21a: compression chamber

23a: refrigerant suction chamber 23b: refrigerant discharge chamber

24a: suction valve 50: suction muffler

50a: resonance space 60: first body

62a, 62b: 1st and 2nd guides 65: Euro connection

70: second body 80: non-return valve

81: reed valve 82: fixed protrusion

86: stopper

The present invention relates to a hermetic compressor, and more particularly, to a hermetic compressor which prevents the refrigerant gas inside the compression chamber from flowing back to the suction muffler during operation of the hermetic compressor.

In general, a hermetic compressor is used to compress a refrigerant in a refrigeration cycle used in a refrigerator or an air conditioner, and includes a sealed container for forming an exterior, a compression device provided inside the sealed container to compress a refrigerant, and the compression device. It is provided with a drive device for providing a driving force to the.

On one side and the other side of the sealed container, a suction pipe for guiding the low pressure refrigerant through the evaporator of the refrigerating cycle into the sealed container and a discharge pipe for guiding the high pressure refrigerant compressed in the sealed container to the condenser side, respectively.

The compression device is coupled to one side of the cylinder to form a compression chamber in which the refrigerant is compressed, a piston for linearly reciprocating the inside of the compression chamber to compress the refrigerant, and to seal the compression chamber, and the refrigerant suction chamber and the refrigerant discharge chamber are formed. And a valve device having a cylinder head, a suction valve provided between the cylinder and the cylinder head to intercept the refrigerant sucked into the compression chamber from the refrigerant suction chamber, and a discharge valve for regulating the refrigerant discharged from the compression chamber to the refrigerant discharge chamber.

At the refrigerant suction chamber side of the cylinder head, a suction muffler is installed to reduce the flow noise of the suction refrigerant sucked into the compression chamber.

When the driving device is driven in such a hermetic compressor, a piston reciprocates linearly in the compression chamber, and a pressure difference is formed between the compression chamber and the outside of the compression chamber.

Due to this pressure difference, the low pressure refrigerant passing through the evaporator is sucked into the compression chamber through the suction pipe, the suction muffler and the refrigerant suction chamber, and the high pressure refrigerant compressed and discharged from the compression chamber passes through the refrigerant discharge chamber and the discharge tube to the condenser side. Supplied.

In such a conventional hermetic compressor, most of the refrigerant compressed in the compression chamber during the compression stroke of the hermetic compressor is discharged to the discharge chamber side through the discharge valve, but when the piston moves from the bottom dead center to the top dead center to start compressing the refrigerant, Some of the refrigerant inside is discharged through the suction valve before the suction valve is closed. The refrigerant discharged through the suction valve reaches the suction muffler and primarily has a resonance space formed inside the suction muffler, and secondly, the internal space of the sealed container causes low frequency noise.

In addition, since the amount of the refrigerant discharged from the compression chamber to the condenser is reduced by the amount of the refrigerant discharged to the suction muffler side through the suction valve, there is a problem that the compression capacity of the compressor is lowered, reducing the freezing capacity of the refrigeration cycle as a whole.

The present invention is to solve such a problem, an object of the present invention is to prevent the refrigerant from flowing back from the compression chamber to the suction muffler side to reduce the noise generated in the compressor, it is possible to prevent a decrease in the compression capacity of the compressor It is to provide a hermetic compressor that can.

A hermetic compressor according to the present invention for achieving the above object is a hermetically sealed container, a compression chamber for compressing a refrigerant guided into the hermetic container, a refrigerant suction chamber communicating with the compression chamber so that the refrigerant is sucked into the compression chamber, and the refrigerant. A suction muffler connected to a suction chamber to reduce the flow noise of the suction refrigerant sucked into the compression chamber, and a connection channel connecting the refrigerant suction chamber and a resonance space formed inside the suction muffler to resonate from the compression chamber. And a non-return valve for preventing the refrigerant from flowing back into the space.

The non-return valve may include a reed valve for opening and closing the connection flow path and a stopper for limiting the movement of the reed valve so that the reed valve opens only in a direction in which refrigerant flows into the compression chamber.

In addition, the reed valve is provided with a fixing protrusion so that the reed valve is installed in the connection flow path, characterized in that the fixing groove for accommodating the fixing protrusion is provided on the connection flow path.

In addition, the suction muffler includes a guide tube in which the connection flow path is formed, and the guide tube has a first extension part extending into the resonance space and a second extension part extending out of the resonance space. And a second guide tube detachably coupled to the second guide portion of the first guide tube.

In addition, one side of the first guide tube and the second guide tube is formed with a screw thread, the other side is formed with a screw groove is characterized in that the first guide tube and the second guide tube is coupled.

In addition, the hermetic compressor according to the present invention includes a hermetic container, a suction tube provided to guide the refrigerant outside the hermetic container into the hermetic container, a compression chamber provided to compress the refrigerant guided into the hermetic container through the suction tube, and A suction muffler provided between the compression chamber and the suction pipe to reduce the flow noise of the refrigerant sucked into the compression chamber, and installed at an outlet side of the suction muffler to prevent the refrigerant from flowing back from the compression chamber into the suction muffler. It characterized in that it comprises a non-return valve.

In addition, the non-return valve includes a reed valve for opening and closing the outlet side of the suction muffler, and a stopper for limiting the movement of the reed valve so that the reed valve is opened only in the direction in which the refrigerant flows into the compression chamber. It is done.

In addition, the suction muffler includes a guide tube defining a resonance space formed therein and a connection flow path connecting the resonance space and the compression chamber, wherein the guide tube has a first extension extending into the resonance space. And a first guide tube having a second extension portion extending out of the resonance space, and a second guide tube detachably coupled to the second extension portion of the first guide tube.

In addition, the non-return valve is installed on the second extension portion.

Hereinafter, with reference to the accompanying drawings, a hermetic compressor according to an embodiment of the present invention will be described in detail.

As shown in FIG. 1, the hermetic compressor according to the embodiment of the present invention is provided in the hermetic container 10 and the hermetic container 10 formed by combining the upper container 10a and the lower container 10b. A compression device 20 for compressing the refrigerant and a drive device 30 for providing power to the compression device 20 are provided.

On one side and the other side of the sealed container 10, the suction pipe 11 for guiding the low pressure refrigerant through the evaporator of the refrigerating cycle into the sealed container 10 and the compression device 20 inside the sealed container 10, respectively. A discharge tube 12 for guiding the compressed high-pressure refrigerant to the condenser side of the refrigeration cycle is installed.

The compression device 20 is formed integrally with the frame 40 and forms a cylinder 21 forming a compression chamber 21a in which a refrigerant is compressed, and a piston 22 installed to enable a linear reciprocating motion in the compression chamber 21a. ) And the refrigerant discharge chamber 23b coupled to one side of the cylinder 21 to communicate with the compression chamber 21a and communicating with the discharge tube 12 and the refrigerant suction chamber 23a communicating with the suction tube 11 are mutually provided. Intake valve 24a and compression that intercepts the flow of the refrigerant sucked into the compression chamber 21a from the refrigerant suction chamber 23a between the cylinder head 23 provided to be partitioned, and the cylinder 21 and the cylinder head 23. A valve device 24 having a discharge valve 24b for intermittent the flow of the refrigerant discharged from the chamber 21a to the refrigerant discharge chamber 23b is provided.

 The driving device 30 provides a driving force to allow the piston 22 to linearly reciprocate in the compression chamber 21a, and includes a stator 31 and a stator 31 fixed to an outer side of the lower portion of the frame 40. A rotor 32 is provided inside the rotor 32 and rotates by electromagnetic interaction with the stator 31, and a rotating shaft 33 press-fitted in the center of the rotor 32 to rotate together with the rotor 32.

The upper part of the rotating shaft 33 passes through the hollow part 41 formed in the center of the frame 40 and extends to the upper part of the frame 41, and the upper end of the rotating shaft 33 extending to the upper part of the frame 40 is the rotating shaft 33. To form an eccentric portion 33a for eccentric rotation at the time of rotation, and to convert the eccentric rotational movement of the eccentric portion 33a into a linear reciprocating movement of the piston 22 between the eccentric portion 33a and the piston 22. The connecting rod 25 is installed.

In such a hermetic compressor, the rotating shaft 33 rotates together with the rotor 32 by the electromagnetic interaction between the stator 31 and the rotor 32, and the eccentric portion of the rotating shaft 33 through the connecting rod 25. Piston 22 connected to (33a) is a linear reciprocating motion in the compression chamber (21a). As such, when the piston 22 linearly reciprocates in the compression chamber 21a, a pressure difference occurs between the inside and the outside of the compression chamber 21a. Due to this pressure difference, the low pressure refrigerant passing through the evaporator of the refrigerating cycle is sucked into the compression chamber 21a through the suction pipe 11 and the refrigerant suction chamber 23a, and is sucked into the compression chamber 21a to compress the high pressure. The refrigerant is supplied to the condenser side of the refrigerating cycle via the refrigerant discharge chamber 23b and the discharge tube 12.

On the other hand, between the suction pipe 11 and the cylinder head 23, a suction muffler 50 is provided to reduce the flow noise of the refrigerant sucked into the compression chamber 21a.

As shown in FIGS. 2 to 4, the suction muffler 50 is coupled to the first body 60 communicating with the compression chamber 21a and the second body 70 communicating with the suction tube 11. It is formed.

In order to couple the first body 60 and the second body 70, a lower end of the first body 60 is provided with a protrusion-like first engaging portion 61 formed along an edge thereof, corresponding to the second On the upper end of the body 70, a second coupling portion 71 provided in a groove shape to be coupled to the first coupling portion 61 is formed along the edge.

The first body 60 and the second body 70 are each made of an injection molding, and the first body 60 and the second body 70 are combined to form one resonance space 50a in the inner space.

The first body 60 is formed so that the lower part is opened, and a guide tube 62 is formed at the central side of the first body 60 to guide the refrigerant introduced into the resonance space 50a to the refrigerant suction chamber 23a. . The lower end of the guide tube 62 extends a predetermined length into the resonance space 50a, and the upper end of the guide tube 62 is outside the resonance space 50a so as to be inserted into the refrigerant suction chamber 23a of the cylinder head 23. The outlet 62c of the suction muffler 50 is formed at the upper end of the guide tube 61.

The second body 70 is formed so that the upper portion is open, the outer side of the second body 70 is inserted into the inlet 71a of the suction muffler 50 by communicating with the inside and the outside of the resonance space (50a) The tube portion 72 is formed.

A coil spring 75 for guiding the refrigerant in the suction pipe 11 directly to the resonance space 50a is installed between the insertion pipe portion 72 and the suction pipe 11. One end of the coil spring 75 is inserted a predetermined length into the insertion tube portion 72, the outlet end of the suction pipe 11 is inserted a predetermined length to the other end of the coil spring 75 so that the coil spring 75 is the suction pipe (11) And between the suction muffler (50).

The coil spring 75 allows the refrigerant guided into the sealed container 10 along the suction pipe 11 to flow into the suction muffler 50 while the compressor 20 and the driving device 30 are operated when the compressor operates. Vibration generated from the serves to prevent the transfer to the sealed container 10 through the suction pipe (11).

On the other hand, inside the guide tube 62 inserted into the refrigerant suction chamber 23a of the cylinder head 23, a connection passage 65 is formed to connect the resonance space 50a and the refrigerant suction chamber 23a. On the flow path 65, a non-return valve 80 is provided to prevent the refrigerant from flowing back from the compression chamber 21a to the resonance space 50a inside the suction muffler 50.

The first guide pipe 62a is formed integrally with the first body 60 of the suction muffler 50 so that the non-return valve 80 can be easily installed on the connection flow path 65. And a second guide tube 62b that is manufactured separately from the first guide tube 62a and detachably coupled to an upper portion of the first guide tube 62a. The first guide tube 62a has a first extension portion 62e extending into the resonance space 50a and a second extension portion 62f extending out of the resonance space 50a.

A thread 63 is formed on the outer circumferential surface of the second extension part 62f to couple the first guide tube 62a and the second guide tube 62b that are separately manufactured, and the inner circumferential surface of the second guide tube 62b The screw groove 64 corresponding to the screw thread 63 formed in the second extension portion 62f is formed. Therefore, when the first guide tube 62a is rotated in the direction in which the screw 63 and the screw groove 64 are coupled, the first guide tube 62a can be easily coupled to the second guide tube 62b.

The non-return valve 80 installed on the connection flow path 65 restricts the movement of the reed valve 81 so that the reed valve 81 and the reed valve 81 which open and close the connection flow path 65 are opened to only one side. A stopper 86 is provided.

The reed valve 81 is made of stainless steel or plastic material with little rigidity to bend well according to the pressure difference, and the stopper 86 supports the lower end of the reed valve 81 so that the reed valve 81 is Make sure you can only bend to the upper side.

Therefore, when the non-return valve 80 is installed on the connection passage 65, the refrigerant may flow from the resonance space 50a side of the suction muffler 50 only to the compression chamber 21a side, and the compression chamber 21a side. Cannot flow toward the resonance space 50a.

In order to install the non-return valve 80 on the connection flow path 65, the second guide pipe 62b is separated from the first guide pipe 62a, and then a stopper is provided on the inner surface of the first guide pipe 62a. 86 and reed valve 81 are provided, respectively.

A fixed protrusion 82 is provided on the reed valve 81 so that the reed valve 81 is fixed to an inner surface of the first guide tube 62a to form a fixed end, and the fixed protrusion 82 is provided on the first guide tube 62a. The fixing groove 66 cut in the radial direction from the inner surface of the first guide tube 62a is provided so that the 82 is received and fixed.

In order to form the non-return valve 80 in the connection passage 65, the stopper 86 is first fixed to a position facing the fixing groove 66 at the inner side of the first guide pipe 62a. Then, the reed valve 81 is installed. When the reed valve 81 is installed, the fixing protrusion 82 of the reed valve 81 is inserted into the fixing groove 66 and then fixed.

As a method for fixing the stopper 86 and the reed valve 81, various methods such as bolt fixing and bonding fixing may be used, but are preferably fixed by ultrasonic welding.

After installing the non-return valve 80 on the connection flow path 65 as described above, the second guide pipe 62b is coupled to the first guide pipe 62a. Then, since the fixing protrusion 82 of the reed valve 81 is pressed by the pressing jaw 67 provided in the lower portion of the first guide pipe 62a, the reed valve 81 is more firmly fixed.

Next will be described with respect to the operation of the hermetic compressor according to an embodiment of the present invention and the effects of the above configuration.

When the driving device 30 is driven in the hermetic compressor, when the piston 22 moves from the top dead center to the bottom dead center in the compression chamber 21a, the pressure inside the compression chamber 21a is the pressure outside the compression chamber 21a. The lower pressure refrigerant passing through the evaporator is sucked into the compression chamber 21a through the suction pipe 11, the suction muffler 50, and the refrigerant suction chamber 23a. The suction of the refrigerant into the compression chamber 21a is continued until the piston 22 reaches the bottom dead center.

When the piston 22 again moves from the bottom dead center to the top dead center, the pressure inside the compression chamber 21a starts to be higher than the pressure outside the compression chamber 21a, so that the open suction valve 24a moves in the closing direction. Since the intake valve 24a is not closed at one instant but closes according to the change in the pressure inside the compression chamber 21a, a predetermined amount of refrigerant is discharged to the refrigerant intake chamber 23a through the intake valve 24a.

However, since the non-return valve 80 is installed in the connection flow path 65 connecting the refrigerant suction chamber 23a and the resonance space 50a of the suction muffler 50, the reversed refrigerant flows into the resonance space 50a. It does not flow in. Accordingly, it is possible to solve the problem that low-frequency noise occurs by having a resonance space in the refluxed refrigerant.

In addition, it is possible to reduce the amount of refrigerant discharged through the intake valve can improve the compression capacity of the compressor, it is possible to improve the freezing capacity of the refrigeration cycle as a whole.

As described above in detail, according to the hermetic compressor according to the present invention, the refrigerant flowing back through the suction valve is blocked by entering the resonance space of the suction muffler.

In addition, since the amount of refrigerant discharged through the intake valve can be reduced, the compression capacity of the compressor can be improved.

Claims (9)

Airtight containers, A compression chamber for compressing the refrigerant guided into the sealed container; A refrigerant suction chamber communicating with the compression chamber such that the refrigerant is sucked into the compression chamber; A suction muffler connected to the refrigerant suction chamber to reduce flow noise of the suction refrigerant sucked into the compression chamber; And a non-return valve installed on a connection flow path connecting the refrigerant suction chamber and the resonance space formed inside the suction muffler to prevent the refrigerant from flowing back from the compression chamber to the resonance space. The method of claim 1, The non-return valve includes a reed valve for opening and closing the connection flow path and a stopper for limiting the movement of the reed valve so that the reed valve opens only in a direction in which refrigerant flows into the compression chamber. The method of claim 2, The reed valve is provided with a fixing protrusion on the reed valve so that the reed valve is installed in the connecting flow path, characterized in that the fixing groove for accommodating the fixed projection is provided on the connection flow path. The method of claim 1, The suction muffler includes a guide tube in which the connection channel is formed, and the guide tube includes a first guide having a first extension extending into the resonance space and a second extension extending outside the resonance space. And a second guide tube detachably coupled to the second extension portion of the first guide tube. The method of claim 4, wherein Sealed compressor, characterized in that the screw thread is formed on one side of the first guide tube and the second guide tube, the screw groove is formed on the other side is coupled to the first guide tube and the second guide tube. Airtight containers, A suction pipe provided to guide the refrigerant outside the sealed container into the sealed container; A compression chamber provided to compress the refrigerant guided into the hermetic container through the suction pipe; A suction muffler provided between the compression chamber and the suction pipe to reduce the flow noise of the refrigerant sucked into the compression chamber; And a non-return valve installed at an outlet side of the suction muffler to prevent a refrigerant from flowing back from the compression chamber into the suction muffler. The method of claim 6, The non-return valve includes a reed valve for opening and closing the outlet side of the suction muffler, and a stopper for limiting the movement of the reed valve so that the reed valve opens only in a direction in which refrigerant flows into the compression chamber. Hermetic compressor. The method of claim 6, The suction muffler includes a resonance tube formed therein, and a guide tube forming a connection flow path connecting the resonance space and the compression chamber. The guide tube is detachably coupled to a first guide tube having a first extension extending into the resonance space and a second extension extending outside the resonance space, and a second extension of the first guide tube. The hermetic compressor comprising a second guide tube that is. The method of claim 8, The check valve is characterized in that the non-return valve is installed in the second extension.

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