CN1906414A - Hermetic compressor - Google Patents

Abstract

A hermetic compressor including a discharge valve system in a cylinder. Discharge valve system (114) includes discharge reed (127) having opening/closing portion (132) and discharge reed holding portion (131), spring reed (128) having movable portion (134) and spring reed holding portion (133), and stopper (129) having regulation portion (138) and stopper holding portion (137). Discharge reed (127), spring reed (128) and stopper (129) are fixed in this order to pedestal (125) of valve plate (113). At spring reed bending portion (135) provided in movable portion (134), movable portion (134) is bent toward the direction of valve seat (124) and tip portion (136) is brought into contact with plate contact portion (126). Space is provided between movable portion (134) of spring reed (128) and opening/closing portion (132) of discharge reed (127), and both are not brought into close contact with each other. Thus, delay in closing discharge reed (127) can be prevented. As a result, since it is possible to prevent discharge reed (127) and spring reed (128) from being brought into close contact with each other, the deterioration of the refrigerating capacity can be suppressed and high efficiency can be achieved.

Description

hermetic compressor

technical field

The present invention relates to a hermetic compressor used in a refrigerator or the like having a refrigerator.

Background technique

As a conventional hermetic compressor, for example, Unexamined Japanese Patent Publication No. 2002-195160 discloses a compressor equipped with a discharge valve system that reduces noise and noise during operation by reducing loss when opening and closing the discharge reed. Improve energy efficiency.

Hereinafter, a conventional hermetic compressor is explained with reference to the accompanying drawings.

7 and 8 show a sectional view and a plan view, respectively, of a conventional hermetic compressor. 9 and 10 show a side sectional view and an exploded view, respectively, of a discharge valve system of a conventional hermetic compressor.

In FIGS. 7 to 10, a sealed container 1 includes a discharge pipe 2 and a suction pipe 3 connected to a cooling system (not shown). In addition, the hermetic container 1 stores oil 4 at its bottom, accommodates an engine unit 7 composed of a stator 5 and a rotor 6 , and a compressor unit 8 driven by the engine unit 7 . The inside of the airtight container 1 is filled with refrigerant 9 .

Next, the main structure of the compressor unit 8 will be described.

The cylinder 10 includes a substantially cylindrical compression chamber 11 and a bearing 12 . A valve disc 13 is on the outside of the cylinder 10 with an outlet valve system 14 to close the compression chamber 11 . The head 15 covers the valve disc 13 . One end of the sound-absorbing muffler 16 is opened in the sealed container 1 , and the other end communicates with the compression chamber 11 . The crankshaft 17 has a main shaft 18 and an eccentric shaft 19 , is supported by the bearing 12 of the cylinder, and is press-fitted and fixed to the crankshaft. The piston 20 is reciprocally slidably inserted into the compression chamber 11 , and is connected to the eccentric shaft 19 through a connecting rod 21 .

Next, the discharge dump valve system 14 provided in the compressor unit 8 will be described with reference to FIG. 9 .

The valve disk 13 has a recessed portion 22 on the outside of the cylinder 10 . The concave portion 22 is provided with a discharge hole 23 communicating with the cylinder 10 and a valve seat 24 to be formed around the discharge hole 23 . The valve disc 13 is provided with a seat 25 formed substantially on the same plane as the valve seat 24 . The discharge reed 26 , the elastic reed 27 and the stopper 28 are fixed to the base 25 by rivets 29 in this order.

The discharge reed 26 is made of tongue-shaped elastic material. The discharge reed 26 includes a discharge reed holding portion 30 fixed to the base 25 and an opening/closing portion 31 for opening and closing the valve seat 24 .

The elastic reed 27 is made of tongue-shaped elastic material. The elastic reed 27 includes an elastic reed holding portion 32 fixed to the base 25 and a movable portion 33 , and has a bent portion 34 at the root adjacent to the opening/closing portion 31 of the discharge reed 26 .

The stopper 28 includes a stopper holding portion 35 fixed to the base 25 and an adjustment portion 36 for adjusting the movement of the discharge reed 26 . The adjustment portion 36 of the stopper 28 is substantially parallel to the plane containing the valve seat 24 and the seat 25 in a cross-sectional view.

The movable part 33 of the elastic reed 27 is adjusted by adjusting the bending angle of the curved part 34, so as to be between the movable part 33 and the opening/closing part 31 of the discharge reed 26, and between the movable part 33 and the stopper 28. There is a predetermined space between the adjustment parts 36 .

Hereinafter, the operation of the hermetic compressor constructed as described above will be explained.

When electric current is supplied to the engine unit 7, the rotor 6 rotates and the crankshaft 17 is driven to rotate. At this time, the eccentric rotational motion of the eccentric shaft 19 is transmitted to the piston 20 through the connecting rod 21 , so that the piston 20 reciprocates in the compression chamber 11 .

With the reciprocating motion of the piston 20 , the refrigerant 9 in the sealed container 1 is sucked from the sound absorbing muffler 16 into the compression chamber 11 and at the same time, the low-pressure refrigerant 9 flows into the sealed container 1 from the cooling system (not shown) through the suction pipe 3 . The refrigerant 9 drawn into the compression chamber 11 is compressed and then discharged into the head 15 through the discharge valve system 14 of the valve disc 13 . In addition, the high-pressure gas flowing into the header 15 is discharged from the discharge pipe 2 into a refrigeration system (not shown).

However, there is a problem in the conventional hermetic compressor that the refrigerating capacity and efficiency vary easily.

Contents of the invention

The invention relates to a hermetic compressor having a cylinder with a discharge valve system. The discharge valve system includes a discharge reed having an opening/closing portion and a discharge reed holding portion; an elastic reed having a movable portion and an elastic reed holding portion; and a stopper having an adjusting portion and a stopper holding portion. The discharge reed, elastic reed and stopper are fixed on the base of the valve disc in this order. The movable part is provided with an elastic reed bending part, and the movable part is bent toward the direction of the valve seat. The end of the movable portion can be brought into contact with the disc contact portion. A space is provided between the movable part of the elastic reed and the opening/closing part of the discharge reed, so that the two parts do not come into close contact with each other with oil, thereby preventing the closing delay of the discharge reed. Furthermore, since the distance of the space is stabilized in a state where the end portion comes into contact with the disc contact portion, an effect of stabilizing the elastic performance of the discharge valve system is obtained.

The hermetic compressor of the present invention can prevent the discharge reed and the elastic reed from being in close contact with each other and can stabilize the elastic performance of the discharge valve system. Therefore, the present invention can provide a stable hermetic compressor with high energy efficiency.

Description of drawings

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

FIG. 2 is a plan view of a hermetic compressor according to an exemplary embodiment of the present invention.

3 is a side cross-sectional view of the discharge valve system when closed, according to an exemplary embodiment of the present invention.

4 is an exploded view of a discharge valve system according to an exemplary embodiment of the present invention.

FIG. 5 is a side cross-sectional view of a discharge valve system according to an exemplary embodiment of the present invention when opened.

FIG. 6 is a graph of elastic performance of a discharge valve system according to an exemplary embodiment of the present invention.

Fig. 7 is a sectional view of a conventional hermetic compressor.

Fig. 8 is a plan view of a conventional hermetic compressor.

Fig. 9 is a side sectional view of a discharge valve system of a conventional hermetic compressor.

Fig. 10 is an exploded view of a discharge valve system of a conventional hermetic compressor.

Detailed ways

The inventors of the present invention have found that in conventional hermetic compressors, exactly after the hermetic compressor starts to operate, a phenomenon sometimes occurs: a lower than normal cooling capacity lasts for a relatively long period of time. time. The inventors of the present invention were able to explain the mechanical structure of the discharge reed 26 and the elastic reed 27 by analyzing their operation. Therefore, first, the mechanical structure will be described with reference to FIGS. 7 to 10 . In FIG. 9 , the direction of closing the discharge reed is indicated by the "inflow" direction of the cylinder 10 and the direction of opening the discharge reed is indicated by the direction of "outflow" of the cylinder 10 .

This low cooling capacity phenomenon tends to occur when the hermetic compressor is started, oil 4 and refrigerant 9 are returned from a refrigeration cycle (not shown). Then, since the oil 4 and the refrigerant 9 are compressed and discharged, a lot of oil 4 intervenes between the discharge reed 26 and the elastic reed 27 .

In addition, in general, when the hermetic compressor starts to operate, the suction pressure is high, and the relatively high-density refrigerant 9 is compressed and discharged until the pressure inside the hermetic container 1 decreases, and a large load is applied to the discharge reed 26 The on/off part 31. On the other hand, since the displacement of the opening/closing portion 31 of the discharge reed 26 is regulated by the regulating portion 36 of the stopper 28, the opening/closing portion 31 of the discharge reed 26 is moved toward the elastic reed 27 by the high-density refrigerant 9. The movable portion 33 is firmly pressed, and the movable portion 33 of the elastic reed 27 is disposed between the opening/closing portion 31 of the discharge reed 26 and the adjusting portion 36 of the stopper 28 .

As mentioned above, since a large pressure load is applied, the opening/closing portion 31 of the discharge reed 26 and the movable portion 33 of the elastic reed 27 are brought into close contact with each other by the oil 4 . That is, the discharge reed 26 and the elastic reed 27 are integrated with each other and perform an on/off operation like one thick piece of the discharge reed performs an on/off operation.

In this case, the movable part 33 of the spring tongue 27 is bent at the bending part 34 in the direction of opening of the discharge leaf 26 ("outflow" direction). As a result, the elastic force of the elastic reed 27 is in the opening direction ("outflow" direction) opposite to the closing direction ("inflow" direction) in which the discharge reed 26 is closed, so the discharge reed 26 is pulled towards the opening direction ("inflow" direction) Outflow" direction) thus prolonging the closing time.

As a result, the opening time of the discharge reed 26 is longer when the piston 20 moves in the compression chamber 11 to the suction stroke after top dead center. During this time, inside the compression chamber 11, the high-pressure refrigerant flows back and the substantial displacement amount of the piston decreases. Thus, a low cooling capacity phenomenon occurs.

During this low capacity phenomenon, the performance of the hermetic compressor is poor. Thus, while increasing the energy consumption, the cooling of the refrigeration device installed on this hermetic compressor is slowed down.

In addition, since the space between the movable portion 33 of the elastic reed 27 and the opening/closing portion 31 of the discharge reed 26 is adjusted by adjusting the bending angle of the curved portion 34 of the elastic reed 27, the elastic spring The space between the movable portion 33 of the sheet 27 and the opening/closing portion 31 of the discharge reed 26 is easily changed. When the discharge reed 26 is opened, the displacement easily changes until the discharge reed 26 comes into contact with the elastic reed 27 . That is, a deformation point at which the elastic force of the discharge reed 26 is transformed into the resultant elastic force of the discharge reed 26 and the elastic reed 27 changes, thereby causing a change in elastic properties.

Therefore, it can be considered that the opening amount and closing duration of the discharge reed 26 are easily changed, so that the cooling capacity and efficiency can be changed.

The present invention is made based on the explanation of the mechanism of the above-mentioned low cooling capacity phenomenon, and the present invention provides a stable hermetic compressor in which the closing delay of the discharge reed does not easily occur and has high energy efficiency.

The hermetic compressor of the present invention includes a valve disc with a discharge valve system outside the cylinder. The discharge valve system includes a discharge hole formed on the valve disc; a valve seat arranged outside the valve disc to surround the discharge hole; a seat formed on the outside of the valve disc at substantially the same height as the valve seat; The disc contact part at the high position of the valve seat on the outer side; the discharge reed made of sheet elastic material with the opening/closing part covering the discharge hole capable of opening and closing the discharge hole; an elastic reed made of sheet-shaped elastic material; and a stopper arranged outside the elastic reed. The spring leaf has a spring leaf bent portion and a tip in the movable portion. In the elastic reed bending portion, the elastic reed is bent in the direction of the valve seat and its end can be brought into contact with the disk contact portion.

Even when oil is interposed between the discharge reed and the elastic reed, and excessive load is applied to the discharge reed at startup, etc., because the The space of the reed prevents close contact due to intervening oil. Furthermore, since the distance of the space is stabilized at the position where the contact with the disc contact portion is achieved, the elastic performance of the discharge valve system can be stabilized. Thus, a stable hermetic compressor with high energy efficiency can be provided.

Hereinafter, an exemplary embodiment of the present invention is explained with reference to the accompanying drawings.

(exemplary embodiment)

1 and 2 are a sectional view and a plan view, respectively, of a hermetic compressor according to an exemplary embodiment of the present invention. 3 is a side sectional view of the discharge dump valve system according to an exemplary embodiment of the present invention when it is closed; FIG. 4 is an exploded view of the discharge dump valve system; FIG. 5 is when the discharge dump valve system is open and Figure 6 is a graph showing the elastic performance of the discharge dump valve system. In Figures 1 and 2, the direction of closing the discharge reed is indicated by the direction "into" the cylinder and the direction of opening the discharge reed is indicated by the direction "out of" the cylinder.

In FIGS. 1 to 6, a sealed container 101 includes a discharge pipe 102 and a suction pipe 103 connected to a cooling system (not shown), and stores oil 104 at its bottom. Furthermore, the hermetic container 101 accommodates an engine unit 107 composed of a stator 105 and a rotor 106 and a compressor unit 108 driven by the engine unit 107 . The inside of the airtight container 101 is filled with a refrigerant 109 . The refrigerant 109 used is preferably a refrigerant conforming to the standards of environmental issues in recent years, and other than prescribed chlorofluorocarbons. For example, R134a, the natural refrigerant R600a, and the like are preferred refrigerants 109 .

Next, the main structure of the compressor unit 108 will be described.

The cylinder 110 includes a substantially cylindrical compression chamber 111 and a bearing 112 . On the outside ("outflow" side) of the cylinder 110, a valve disc 113 has a discharge valve system 114 for closing the compression chamber 111. The head 115 covers the valve disc 113 . One end of the sound-absorbing muffler 116 is opened in the airtight container 101 , and the other end communicates with the compression chamber 111 . The crankshaft 117 has a main shaft 118 and an eccentric shaft 119 , which are supported by the bearings 112 of the cylinder 110 and are press-fit and fixed into the stator 105 . The piston 120 is reciprocally slidably inserted into the compression chamber 111 and connected to the eccentric shaft 119 through a connecting rod 121 .

Next, the discharge valve system 114 provided on the compressor unit 108 will be described with reference to FIG. 3 .

The valve disc 113 has a recess 122 on the outside ("outflow" side) of the cylinder 110 . The groove 122 is provided with a discharge hole 123 penetrating the valve disc 113 and communicating with the cylinder 110 , and a valve seat 124 surrounding the discharge hole 123 . The valve disc 113 is also provided with a seat 125 formed on the "outflow" side substantially in the same plane as the valve seat 124 , and a disc contact portion 126 . The disc contact portion 126 is substantially parallel to a plane containing the valve seat 124 and seat 125 in a cross-sectional view.

The discharge reed 127 , the elastic reed 128 and the stopper 129 are fixed to the base 125 by rivets 130 in this order. The discharge reed (as the first reed) 127 is made of a tongue-shaped sheet-shaped elastic material and includes a discharge reed holding portion 131 fixed to the base 125 and an opening/closing portion 132 for opening and closing the valve seat 124 .

The elastic reed (as the second reed) 128 is made of a tongue-shaped sheet-shaped elastic material and includes an elastic reed holding portion 133 and a movable portion 134 fixed to the base 125 . The movable part 134 is bent in the direction of the valve seat 124 (the "inflow" direction) at the elastic leaf bending part 135 provided on the movable part 134 . The end portion 136 realizes the disc contact portion 126 which contacts the valve disc.

The stopper 129 includes a stopper holding portion 137 fixed to the base 125 and an adjustment portion 138 for adjusting the movement of the discharge reed 127 . The adjustment portion 138 of the stopper 129 is substantially parallel to the plane containing the valve seat 124 and the seat 125 . That is, the surface of the adjustment portion 138 is substantially parallel to the valve seat 124 and the seat 125 .

Set the height of the disc contact portion 126 on the valve disc 113 so that the movable portion 134 of the elastic reed 128 is between the movable portion 134 and the opening/closing portion 132 of the discharge reed 127 and the movable portion 134 and the stopper 129 There is stably a space between the adjustment parts 138 of the .

The opening/closing portion 132 of the discharge reed 127 is bent toward the direction of the valve seat 124 at the discharge reed bending portion 139 .

Between the valve seat 124 and the base 125 , a portion deeper than the base 125 is provided as a cleaning groove 140 . The discharge reed bend 139 is located outside the clearing groove 140 in the region of the clearing groove 140 . That is, the recessed portion formed on the surface of the valve disc 113 forms the clearing groove 140 , and the height of the bottom surface of the recessed portion is lower than the valve seat 124 and the seat 125 .

The adjusting portion 138 of the stopper 129 is provided at an end portion of a stopper contact portion 141 formed toward a surface bent toward the elastic spring piece 128 . The stopper contact portion 141 is substantially parallel to a plane containing the valve seat 124 and the seat 125 . That is, the brake contact portion 141 is substantially parallel to the disc contact portion 126 .

Hereinafter, the operation and effect of the hermetic compressor constructed as described above will be explained.

When the engine unit 107 is supplied with electric current, the rotor 106 rotates and the crankshaft 117 is driven to rotate. At this time, the eccentric rotational motion of the eccentric shaft 119 is transmitted to the piston 120 through the connecting rod 121 , so that the piston 120 reciprocates in the compression chamber 111 .

With the reciprocating motion of the piston 120, the refrigerant 109 in the sealed container 101 is sucked into the compression chamber 111 from the sound-absorbing muffler 116 and at the same time, the low-pressure refrigerant 109 flows into the sealed chamber from the cooling system (not shown) through the suction pipe 103 Container 101. The refrigerant 109 drawn into the compression chamber 111 is compressed and then discharged into the header 115 through the discharge valve system 114 of the valve disc 113 . In addition, the high-pressure gas discharged into the head 115 is discharged from the discharge pipe 102 into a cooling system (not shown).

Here, when the hermetic compressor starts, oil 104 and refrigerant 109 return in a refrigeration cycle (not shown). Then, since the oil 104 and the refrigerant 109 are compressed and discharged, much oil 104 intervenes between the discharge reed 127 and the elastic reed 128 .

Also, normally, when a hermetic compressor starts running, the suction pressure is high. Accordingly, the refrigerant 109 having a relatively high density is compressed and discharged until the pressure in the hermetic container 1 is reduced, and a large load is applied to the opening/closing portion 132 of the discharge reed 127 .

On the other hand, since the position of the opening/closing portion 132 of the discharge reed 127 is regulated by the regulating portion 138 of the stopper 129, the opening/closing portion 132 of the discharge reed 127 is set toward the discharge reed 127 by the high-density refrigerant 109. The movable part 134 of the elastic reed 128 between the opening/closing part 132 of the brake 129 and the regulating part 138 of the stopper 129 is pressed firmly. As a result, the opening/closing portion 132 of the discharge reed 127 and the movable portion 134 of the elastic reed 128 tend to come into close contact with each other along with the oil 104 .

However, in the first exemplary embodiment, since the elastic reed bent portion 135 is formed on the movable portion 134 of the elastic reed 128, even when the elastic reed 128 is pressed toward the "outflow" side, the discharge spring A space 142 is also formed between the opening/closing portion 132 of the sheet 127 and the movable portion 134 of the elastic spring 128 as shown in FIG. 5 . Due to the space 142, even if the movable portion 134 of the elastic reed 128 and the opening/closing portion 132 of the discharge reed 127 come into close contact with each other, they can be easily separated from each other. That is, tight contact is not continued and the elastic reed 128 and the discharge reed 127 do not integrally operate. Therefore, shutdown delays can be prevented.

As a result, a low cooling capacity phenomenon caused by backflow of high-pressure refrigerant into the compression chamber 111 can be prevented.

When the elastic reed 128 is not pressed to the "outflow" side, as shown in FIG. 3 , the end 136 of the elastic reed 128 is in contact with the disc contact portion 126 provided on the valve disc 113 . Therefore, the movable portion 134 of the elastic reed 128 can stably have a space between the movable portion 134 and the opening/closing portion 132 of the discharge reed 127 . When the discharge reed 127 opens in the "outflow" direction, the position is stable until it comes into contact with the resilient reed 128 . That is, it is possible to suppress variation at the deformation point where the elastic force of the discharge reed 127 is converted into the resultant elastic force of the discharge reed 127 and the elastic reed 128, thereby stabilizing the elastic performance.

As a result, variations in the opening amount and closing time of the discharge reed 127 are suppressed, making it possible to stabilize cooling capacity and efficiency.

Therefore, it is possible to provide a stable hermetic compressor with small variation and high energy efficiency.

Furthermore, since the opening/closing portion 132 of the discharge reed 127 is bent toward the valve seat 124 at the discharge reed bending portion 139 , the spring force pressed onto the valve seat 124 is applied to the opening/closing portion 132 of the discharge reed 127 .

Therefore, it is possible to prevent the opening/closing portion 132 of the discharge reed 127 from floating on the valve seat 124, making it possible to maintain better sealing performance. Therefore, it is possible to provide a hermetic compressor with higher energy efficiency.

In addition, between the valve seat 124 and the base 125 , a groove portion deeper than the base 125 is a cleaning groove 140 . Because the discharge reed curved portion 139 is located outside the corresponding clearing groove 140 , it may prevent the elastic force of the base 125 and the elastic spring 128 from pressing against the clearing groove 140 . As a result, the force with which the opening/closing portion 132 of the discharge reed 127 is pressed against the valve seat 124 can be stably obtained. Sealability between the opening/closing portion 132 and the valve seat 124 is improved. Thus, it is possible to further improve efficiency.

Furthermore, according to an exemplary embodiment, a stopper contact part 141 bent toward the elastic reed 128 is provided on the adjustment part 138 of the stopper 129 . Therefore, even after the elastic reed 128 contacts the stopper contact portion 141, the discharge reed 127 can be further set. As a result, the elastic properties of the discharge reed 127 have two deformation points, and as shown in FIG. 6, three-segment properties can be obtained.

In FIG. 6 , the first deformation point P1 corresponds to the point at which the opening/closing portion 132 of the reed 127 comes into contact with the movable portion 134 of the elastic reed 128 . After the first inflection point P1 and before the second inflection point P2, the resultant elastic force of the opening/closing portion 132 of the elastic reed 127 and the movable portion 134 of the elastic reed 128 can be obtained.

The second deformation point P2 corresponds to the point at which the movable portion 134 of the spring leaf 128 comes into contact with the brake contact portion 141 of the brake 129 . After the second deformation point P2, the support mechanism of the elastic reed is changed from the cantilever type to the two-point support type, so the elastic force is further increased.

As described above, since the two inflection points and the three-stage characteristic are obtained, as the opening amount of the discharge reed 127 becomes larger, the elastic force is stronger and the closing speed is increased. Thus, even in the high cycle region where the discharge reed 127 is widely open, closing delays rarely occur. A hermetic compressor with high efficiency can be provided.

Industrial applicability

As described above, the present invention can provide a stable hermetic compressor with high efficiency in which the closing delay of the discharge reed seldom occurs even when the refrigeration cycle volume is relatively large. Therefore, the hermetic compressor according to the present invention can be used in refrigeration and air-conditioning apparatuses using CO ₂ refrigerant.

Claims (6)

1. a hermetic compressor has the seal container that holds compression unit and oil,

Compression unit comprises:

Cylinder;

Pistons reciprocating in this cylinder; And

Valve disc, this valve disc seal the open end of this cylinder and have the expulsion valve system in this cylinder outside;

This expulsion valve system comprises:

The tap hole that on this valve disc, forms;

Be arranged on the valve seat of this valve disc outside round this tap hole;

Be formed on this valve disc outside, the basic base identical with this valve seat height;

Be formed on the dish contact segment of this valve disc outside, the position higher than this valve seat;

By the discharge reed that flaky elastic material is made, have the ON/OFF part and the discharge reed retaining part that is fixed in this base that cover tap hole in the mode that can open and close this tap hole;

By the elastic spring that flaky elastic material is made, it has elastic spring retaining part and the moveable part that is fixed in this base, and this elastic spring is located at the outside of discharging reed; And

Break has the break retaining part that is fixed in base and regulate part, and this break is positioned at the outside of this elastic spring;

Wherein this elastic spring has elastic spring curved section and end on moveable part, and this elastic spring is in the direction bending of elastic spring curved section towards valve seat, and this end can be realized and coiled contact segment and contact.

2. hermetic compressor according to claim 1, wherein this discharge reed has the reed of discharge curved section between discharge reed retaining part and ON/OFF part; And should discharge reed and discharge of the direction bending of reed curved section towards valve seat.

3. hermetic compressor according to claim 2, wherein the bottom surface recessed portion that is lower than this valve seat and this base is located between the valve seat and base of outer surface of this valve disc, and this discharge reed curved section is located at the outside of this recessed portion.

4. according to arbitrary described hermetic compressor in the claim 1 to 3, wherein break is being regulated the break contact segment that has on the part towards elastic spring lateral bending song.

5. hermetic compressor has:

Cylinder;

Pistons reciprocating in cylinder; And

Valve disc, the open end of this valve disc sealing cylinder and have expulsion valve system in the cylinder outside;

The expulsion valve system comprises:

Be located at the valve seat of this valve disc outside round the hole that penetrates this valve disc;

Be formed on the valve disc outside, the base identical with the valve seat height;

Be formed on the dish contact segment of this valve disc outside, the position higher than valve seat;

One end is fixed in first spring that the base the other end can cover this hole;

At second spring in first spring outside, the one end is fixed in the base the other end and extends to the dish contact segment, and at the middle part towards the direction bending of valve seat; And

One end is fixed in base and covers the break of second spring.

6. hermetic compressor according to claim 5, wherein the bottom surface recessed portion that is lower than this valve seat and this base is located between the valve seat and base of outer surface of this valve disc, and second spring is crooked at some place in the outside of recessed portion.

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