JP5034860B2 - Hermetic compressor - Google Patents

Description

  The present invention relates to a hermetic compressor used for a freezer and the like.

  Conventionally, this type of hermetic compressor is designed to reduce noise with a suction muffler and achieve high efficiency by making the suction port and suction pipe of the suction muffler face each other (for example, see Patent Document 1). .

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 5 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1, FIG. 6 is a top view of the conventional hermetic compressor, and FIG. 7 is an enlarged view of a main part of the conventional hermetic compressor. It is sectional drawing.

  5 to 7, the hermetic container 1 contains an electric element 7 including a stator 3 and a rotor 5, a compression element 9 driven by the electric element 7, and a lubricating oil 11.

  Further, a suction pipe 13 having one end opened into the sealed container 1 is fixed to the sealed container 1.

  The compression element 9 is disposed so as to seal a cylinder 17 that forms the compression chamber 15, a piston 19 that is slidably inserted into the compression chamber 15, and an end of the cylinder 17. A formed valve plate 23 and a suction muffler 25 are provided.

  The operation of the hermetic compressor configured as described above will be described below.

  When the electric element 7 is energized from the external power source, the rotor 5 rotates, and accordingly, the piston 19 reciprocates in the compression chamber 15 and the compression element 9 performs a predetermined compression operation.

  As a result, the refrigerant 34 flowing from the cooling system (not shown) is once released into the sealed container 1 through the suction pipe 13 and then sucked into the suction muffler 25 through the suction port 31, so Then, the air is sucked into the compression chamber 15 through the communication pipe 29 and the suction hole 21.

  Then, the refrigerant 34 guided to the compression chamber 15 is compressed in the compression chamber 15 by the reciprocating motion of the piston 19 and then discharged again to a cooling system (not shown).

When the refrigerant 34 is sucked into the suction muffler 25, the suction pipe 13 and the suction port 31 are arranged so as to face each other, so that the refrigerant 34 is sucked into the suction muffler 25 while the temperature of the refrigerant 34 is relatively low. As a result, the suction mass (refrigerant circulation amount) of the refrigerant 34 per unit time is increased, the efficiency is improved, and the efficiency of the hermetic compressor is improved.
Japanese Patent Publication No. 7-62474

  However, in the above conventional configuration, the suction pipe 13 and the suction port 31 are close to each other, so that when a refrigerant 34 containing a large amount of liquid refrigerant or a large amount of lubricating oil 11 flows from a cooling system (not shown). These have a problem that they are easily sucked into the suction muffler 25, and the compression element 9 may break down due to liquid compression in the compression chamber 15.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a highly efficient hermetic compressor that is less prone to failure due to liquid compression.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention includes a suction muffler and a tail pipe that communicates the space in the sealed container above the suction pipe with the sound deadening space, and the tail pipe has a sound deadening space. And a suction port that opens into the space inside the sealed container. The discharge port has a larger cross-sectional area than the suction port. Since it is difficult to suck in and the suction resistance of the refrigerant through the tail tube can be reduced, liquid compression is hardly caused and high efficiency is obtained.

  The hermetic compressor of the present invention is less prone to failure due to liquid compression, and can provide a highly efficient hermetic compressor.

  According to the first aspect of the present invention, an electric element composed of a stator and a rotor and a compression element driven by the electric element are accommodated in an airtight container and lubricating oil is stored, and the airtight container has one end. A suction pipe having an opening that opens into the sealed container, wherein the compression element includes a cylinder that forms a compression chamber, a valve plate that seals an end of the cylinder and forms a suction hole; A suction muffler that forms a silencing space that communicates with the cylinder, and the suction muffler includes a communication pipe that communicates the suction hole provided in the valve plate and the silencing space, and an inside of the sealed container above the suction pipe. A tail pipe that communicates the space with the silencing space, the tail pipe having a discharge port that opens into the silencing space, and an inlet that opens into the space inside the sealed container, The outlet has a larger cross-sectional area than the suction port, and the suction port of the suction muffler is arranged above the suction tube, so that the specific gravity is heavy even if a large amount of liquid refrigerant or lubricating oil flows into the suction tube. Liquid refrigerant and lubricating oil do not flow upward, but flow downward rather than in the horizontal direction, so that direct suction from the suction port can be suppressed, and in addition, the refrigerant is sucked into the tail pipe in the direction in which the refrigerant is sucked. Since the cross-sectional area becomes large, the suction resistance in the tail pipe when the refrigerant passes through the tail pipe can be reduced, so the suction mass (refrigerant circulation amount) per unit time of the refrigerant can be increased, Efficiency is improved, and a highly reliable hermetic compressor with high reliability can be provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the inner periphery of the tail tube forms a tapered shape in which the discharge port has a larger cross-sectional area than the suction port, and the refrigerant passes through the tail tube. The passage cross-sectional area at the time of passage gradually expands and changes, so that it is possible to further reduce the suction resistance in the tail pipe and to prevent the generation of a flow vortex, and the effect according to claim 1. In addition, the suction mass (refrigerant circulation amount) is increased, and the efficiency is further improved, and the generation of noise due to the flow vortex can be prevented.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the tail pipe extends upward from the upper part of the suction muffler, and the pressure in the sealed container at the start of the compressor or the like. Even if the phenomenon that the refrigerant dissolved in the lubricating oil in the airtight container foams due to the decompression (hereinafter referred to as forming) occurs, the tail pipe extends upward from the upper part of the suction muffler, Since it becomes difficult for bubbles to reach the upper suction port, in addition to the effect of claim 1 or 2, liquid compression due to forming can be suppressed, and a highly reliable hermetic compressor can be provided. .

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the auxiliary is formed integrally with the inner wall of the suction muffler and opens into the space in the sealed container at the bottom of the suction muffler. An auxiliary tail pipe having an inlet and extending upward in the silencing space and opening into the silencing space; and an opening in the silencing space of the auxiliary tail pipe and an opening in the silencing space of the communication pipe The exhaust port of the tail pipe is placed between this part and the refrigerant can be quickly supplied to the sound deadening space via the auxiliary tail pipe even when the refrigerant sucked from the sound deadening space is insufficient. Since the auxiliary tail pipe is located at the bottom of the suction muffler, it is possible to suck in the low-temperature refrigerant released into the sealed container through the auxiliary tail pipe, and to discharge the tail pipe. The refrigerant released into the silencing space from the tail pipe Since it can be made to merge smoothly with the flow of the refrigerant | coolant which flows into the opening part in the silence space of a communicating pipe from a discharge port, in addition to the effect as described in any one of Claim 1 to 3, the refrigerant | coolant to a compression chamber Suppressing supply shortage and reducing suction resistance in the silencing space improves efficiency, suppresses noise increase in the silencing space, and provides a highly efficient and low noise hermetic compressor can do.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the auxiliary suction port of the auxiliary tail pipe has a smaller cross-sectional area than the tail pipe, and sucks the refrigerant from the space in the sealed container into the silencing space. The lubricating oil staying in the sound deadening space is discharged into the space in the sealed container, and the opening in the closed container of the auxiliary tail tube at the bottom of the suction muffler is formed compared to the inlet of the tail tube. However, since the cross-sectional area is smaller than that of the tail pipe, the foam does not easily pass through the opening in the closed container of the auxiliary tail pipe, and in addition, lubricating oil enters the silencing space. In this case, the lubricating oil flows down the suction muffler inner wall and reaches the bottom, but since the opening in the closed container of the auxiliary tail pipe is at the bottom of the suction muffler, the lubricating oil can be discharged and flows to the compression chamber To suppress Since it is, in addition to the effect of claim 4, to suppress liquid compression, it provides a more reliable hermetic compressor.

  According to a sixth aspect of the present invention, in the invention of the fourth or fifth aspect, an auxiliary resonator opened downward is provided on an upward extension line in the silencing space of the auxiliary tail tube, Noise generated as valve vibration or refrigerant pulsation can be silenced by the auxiliary resonator so that no noise leaks from the auxiliary tail tube into the sealed container. Since oil can be prevented from flowing into the silencing space, in addition to the effect of the fourth or fifth aspect, a highly reliable and low noise hermetic compressor can be provided.

  According to a seventh aspect of the present invention, in the invention according to any one of the fourth to sixth aspects, the suction muffler surrounds the auxiliary suction port of the auxiliary tail pipe and opens on the side facing the opening end of the suction pipe. A refrigerant receiving portion provided with a surface, the lower end of the opening surface of the refrigerant receiving portion is disposed below the lower end of the opening end of the suction pipe, and the low-temperature refrigerant opened from the suction pipe into the sealed container is Although it flows in the horizontal direction or downward in the sealed container, the lower end of the opening surface of the refrigerant receiving part is disposed below the lower end of the opening end of the suction pipe. In addition to being able to guide to the auxiliary tail pipe, when liquid refrigerant or lubricating oil with a higher specific gravity than the gas refrigerant returns from the suction pipe, it collides with the refrigerant receiver and then moves downward from the refrigerant receiver. In order to fall, Inhalation into the silencing space can be suppressed, and in addition to the effect according to any one of claims 4 to 6, a highly reliable and highly efficient hermetic compressor can be provided. .

  Hereinafter, embodiments of a hermetic compressor according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a longitudinal sectional view of a side surface of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of a front surface of the hermetic compressor according to the same embodiment, and FIG. It is a principal part enlarged view in a form. FIG. 4 is a characteristic comparison diagram of the hermetic compressor according to the embodiment, and compares the taper shape of the tail tube and the characteristics of the refrigerating capacity.

  1 to 3, the sealed container 101 stores lubricating oil 103 at the bottom, and stores an electric element 109 including a stator 105 and a rotor 107, and a compression element 111 driven by the electric element 109. And a suction pipe 113 that communicates the inside and outside of the sealed container 101.

  The compression element 111 seals a cylinder 117 in which a cylindrical compression chamber 115 is formed, a piston 119 inserted into the compression chamber 115 so as to be slidable in a reciprocating manner, and an end of the cylinder 117 and forms a suction hole 121. And a suction muffler 125 that communicates the space in the sealed container 101 with the compression chamber 115.

  The suction muffler 125 includes a silencing space 127, a communication pipe 129 that communicates the suction hole 121 provided in the valve plate 123 and the silencing space 127, and a sealed container that extends upward from the top of the suction muffler 125 and is above the suction pipe 113. A tail pipe 131 that communicates the space in 101 with the sound deadening space 127, an auxiliary tail pipe 133 that has an auxiliary inlet 132 that opens into the space in the sealed container 101 at the bottom of the suction muffler 125, and a refrigerant receiver 135. I have.

  In the silencing space 127, a resonator 137 provided on the side opposite to the tail pipe 131 with the communication pipe 129 interposed therebetween, and an auxiliary resonator 139 opened downward on the upward extension line in the silencing space 127 of the auxiliary tail pipe 133. And.

  The tail tube 131 includes a suction port 141 opened in the sealed container 101 and a discharge port 143 opened in the muffler space 127, and the cross-sectional area of the inner diameter increases from the suction port 141 toward the discharge port 143. A tapered shape is formed.

  The auxiliary tail pipe 133 is formed integrally with the inner wall of the suction muffler 125, extends upward in the silencing space 127, and is opened between the auxiliary tail pipe 133 and the communication pipe 129. Is arranged.

  The auxiliary inlet 132 that opens into the sealed container 101 of the auxiliary tail pipe 133 has a smaller cross-sectional area than the tail pipe 131 and is surrounded by the refrigerant receiving portion 135.

  The refrigerant receiving portion 135 has an opening surface 145 so as to face and oppose the opening end of the suction pipe 113, and the lower end of the opening surface 145 is disposed below the lower end of the opening end of the suction pipe 113.

  The operation and action of the hermetic compressor configured as described above will be described below.

  When the electric element 109 is energized from an external power source, the rotor 107 rotates, and accordingly, the piston 119 reciprocates in the compression chamber 115, and the compression element 111 performs a predetermined compression operation.

  As the pressure in the compression chamber 115 decreases during the suction stroke, the pressure in the sealed container 101 decreases, and the refrigerant 134 is led from the cooling system (not shown) through the suction pipe 113 into the sealed container 101 and opened. Then, the air is sucked into the suction muffler 125 from the inlet 141 of the tail pipe 131 and the auxiliary inlet 132 of the auxiliary tail pipe 133.

  The refrigerant 134 sucked into the suction muffler 125 is opened to the silencing space 127 from the outlet 143 of the tail pipe 131 and the opening in the silencing space 127 of the auxiliary tail pipe 133, and then passes through the communication pipe 129 and the suction hole 121. It is sucked into the compression chamber 115 through. The refrigerant 134 sucked into the compression chamber 115 is compressed by the piston 119 and discharged again to a cooling system (not shown).

  At this time, the pulsation of the refrigerant 134 caused by the compression is attenuated by the silencing space 127 of the suction muffler 125, the resonator 137, and the auxiliary resonator 139, thereby reducing noise.

  Here, the result of studying the shape of the tail tube 131 will be described with reference to FIG. In addition, FIG. 4 has shown the refrigerating capacity change when using a taper-shaped tail pipe on the basis of the refrigerating capacity when using a tail pipe without a taper shape.

  In the present embodiment, the inner periphery of the tail tube 131 has a tapered shape in which the discharge port 143 has a larger cross-sectional area than the suction port 141.

  As shown in FIG. 4, when the suction port 141 and the discharge port 143 have the same passage cross-sectional area, the discharge port 143 has a taper shape having a larger cross-sectional area than the suction port 141, thereby improving the refrigeration capacity and discharging. It can be seen that when the outlet 143 has a tapered shape having a smaller cross-sectional area than the inlet 141, the refrigeration capacity is reduced.

  This is because the flow cross-sectional area when the refrigerant 134 passes through the tail pipe 131 from the suction port 141 gradually expands and flows to the discharge port 143, thereby generating a flow vortex generated by the inner wall of the tail pipe 131. It is assumed that this is because the suction resistance in the tail tube 131 can be further reduced.

  In other words, the refrigerant 134 guided from the cooling system (not shown) to the sealed container 101 has reduced suction resistance in the tail pipe 131 that is the flow path of the refrigerant 134, and the suction mass (refrigerant circulation) of the refrigerant 134 per unit time. The amount) can be increased and the efficiency is expected to improve.

  In general, when the refrigerant 134 opened in the sealed container 101 passes through a channel such as the tail tube 131, the auxiliary tail tube 133, or the communication tube 129, it passes through the channel while receiving suction resistance, and finally. Into the compression chamber 115.

  If the suction resistance is large, sufficient refrigerant 134 cannot be supplied into the compression chamber 115, and the refrigeration capacity of the hermetic compressor is reduced. Thus, the suction resistance greatly affects the refrigerant circulation amount and affects the refrigeration capacity of the hermetic compressor.

  In particular, in the tail pipe 131 and the auxiliary tail pipe 133, since the suction port 141 and the auxiliary suction port 132 are opened in the sealed container 101, the pulsation of the refrigerant 134 caused by the compression is not leaked into the sealed container 101. In some cases, a means for increasing the overall length is used. In the tail tube 131 in which low noise is prioritized, the overall length is increased, the suction resistance is increased, and the performance of the hermetic compressor is often hindered.

  However, the refrigerant 134 flowing from the suction port 141 to the discharge port 143 is allowed to flow through the tail tube by increasing the cross-sectional area from the suction port 141 to the discharge port 143 of the tail tube 131 as in the present embodiment. The suction resistance received by 131 can be reduced, and in the tail pipe 131 that extends upward from the top of the suction muffler 125 and has a long overall length, and in the tail pipe 131 in which the suction port 141 is reduced to reduce noise, the refrigerant 134 It is considered that this is an effective means capable of reducing the suction resistance as a flowing flow path and improving the refrigerating capacity.

  However, it is difficult to completely eliminate the suction resistance in the tail pipe 131. In particular, the cooling system (not shown) often operates at a high refrigerant circulation rate. In some cases, the refrigerant 134 in 127 is insufficient, and sufficient refrigerant 134 cannot be supplied into the compression chamber 115.

  In this case, since the auxiliary tail pipe 133 is provided in the present embodiment, the refrigerant 134 sucked from the tail pipe 131 can be quickly sucked into the silencing space 127 from the auxiliary tail pipe 133. As a result, sufficient refrigerant 134 can be supplied into the compression chamber 115.

  Therefore, since sufficient refrigerant 134 can be supplied into the compression chamber 115 regardless of the cooling system (not shown), the efficiency is improved.

  Further, the flow of the refrigerant 134 in the silencing space 127 is determined by the shape of the silencing space 127 and the arrangement of the opening in the silencing space 127 of the communication pipe 129 and the outlet 143 of the tail pipe 131.

  In the case where there is the auxiliary tail pipe 133, the refrigerant 134 from the opening in the silencing space 127 of the auxiliary tail pipe 133 is sucked into the silencing space 127, so the flow of the refrigerant 134 in the silencing space 127 becomes complicated, and the auxiliary tail pipe 133 Due to the arrangement of the tail pipe 133, the flow of the refrigerant 134 sucked from the tail pipe 131 and the flow of the refrigerant 134 sucked from the auxiliary tail pipe 133 interfere with each other and inhibit each other, whereby the refrigerant 134 in the silencing space 127 communicates. May not flow smoothly to tube 129.

  However, in the present embodiment, since the outlet 143 of the tail pipe 131 is disposed between the opening in the silencing space 127 of the auxiliary tail pipe 133 and the opening in the silencing space 127 of the communication pipe 129, The flow of the refrigerant 134 that flows from the outlet 143 of the tail pipe 131 to the opening in the silence space 127 of the communication pipe 129 is formed in a space between the auxiliary tail pipe 133 and the communication pipe 129, and the noise reduction space of the auxiliary tail pipe 133. The refrigerant 134 released from the opening in 127 can smoothly join the flow of the refrigerant 134 released from the outlet 143 of the tail pipe 131 and can be led to the communication pipe 129.

  Accordingly, the flow of the refrigerant 134 sucked from the tail pipe 131 and the refrigerant 134 sucked from the auxiliary tail pipe 133 can be guided to the communication pipe 129 without interfering with each other, so that the suction in the silencing space 127 is performed. The resistance is reduced, the suction mass (refrigerant circulation amount) per unit time of the refrigerant 134 can be increased, and the efficiency is improved.

  Furthermore, it is possible to suppress the occurrence of vortices and turbulence in the flow of the refrigerant 134 in the silence space, and it is possible to suppress an increase in noise due to the vortices and turbulence.

  In addition, the refrigerant 134 released from the cooling system (not shown) into the sealed container 101 has a lower temperature and a higher density than the refrigerant 134 staying in the sealed container 101 heated by the electric element 109 or the compression element 111. It flows downward.

  In the present embodiment, the opening surface 145 of the refrigerant receiving part 135 is provided so as to face the opening end of the suction pipe 113, and the lower end of the opening surface 145 of the refrigerant receiving part 135 is disposed below the lower end of the opening end of the suction pipe 113. Therefore, the low-temperature refrigerant 134 can be efficiently received by the refrigerant receiver 135 and a large amount of the low-temperature refrigerant 134 can be retained in the space inside the refrigerant receiver 135.

  Therefore, the low-temperature refrigerant 134 stays around the auxiliary suction port 132 of the auxiliary tail pipe 133 and is sucked into the sound deadening space 127 from the auxiliary tail pipe 133.

  Therefore, the low-temperature refrigerant 134 that has flowed into the sealed container 101 via the suction pipe 113 is heated by being diffused into the sealed container 101 or mixed with the refrigerant 134 staying in the sealed container 101. Since the low-temperature refrigerant 134 can be quickly sucked into the suction muffler 125, the suction mass (refrigerant circulation amount) of the refrigerant 134 per unit time can be increased, and the efficiency is improved. .

  That is, in the refrigerant receiving part 135, most of the liquid refrigerant and a large amount of the lubricating oil 103 that are opened in the sealed container 101 through the suction pipe 113 collide with the refrigerant receiving part 135, and the wall surface of the refrigerant receiving part 135 is lowered. And flows down from the lower end of the opening surface 145 of the refrigerant receiver 135 to the bottom of the sealed container 101.

  Therefore, in addition to the effect of further suppressing the direct suction of the liquid refrigerant and the lubricating oil 103 from the suction port 141 of the tail tube 131 and the auxiliary suction port 132 of the auxiliary tail tube 133, the sealed container passes through the suction tube 113. It also has the effect of receiving the low-temperature refrigerant 134 opened in 101 and efficiently sucking it into the muffler space 127 from the auxiliary suction port 132 of the auxiliary tail pipe 133.

  In addition, the refrigerant 134 released from the cooling system (not shown) through the suction pipe 113 into the sealed container 101 in the initial stage of startup may contain liquid refrigerant or a large amount of lubricating oil 103. If the lubricating oil 103 is sucked from the tail pipe 131 or the auxiliary tail pipe 133, it is sucked into the compression chamber 115 through the communication pipe 129 and liquid compression is performed.

  When liquid compression occurs, the pressure in the compression chamber 115 rises abruptly, so that an excessive load is applied to the compression element 111 such as the valve plate 123 and there is a risk of failure. In this embodiment, the suction pipe 113 is used. The suction port 141 and the auxiliary suction port 132 are arranged so as to open further upward.

  Specifically, since the liquid refrigerant or the lubricating oil 103 has a higher density than the refrigerant 134 and flows downward, by arranging the suction port 141 and the auxiliary suction port 132 above the suction pipe 113, Inhalation of the liquid refrigerant and a large amount of the lubricating oil 103 from the suction port 141 and the auxiliary suction port 132 can be suppressed.

  Further, a phenomenon in which the refrigerant 134 dissolved in the lubricating oil 103 stored in the bottom of the sealed container 101 is foamed by reducing the pressure in the sealed container 101 when the compression element 111 is activated (hereinafter referred to as forming). May occur. When forming occurs, the foam foamed from the bottom of the sealed container 101 fills the sealed container 101 upward.

  If bubbles generated by forming are sucked from the suction port 141 of the tail tube 131 and the auxiliary suction port 132 of the auxiliary tail tube 133, they are sucked into the compression chamber 115 via the communication tube 129 and liquid compression is performed. The height of the foam filling upward is greatly influenced by the amount of the refrigerant 134 dissolved in the lubricating oil 103 and the pressure in the sealed container 101. In this embodiment, the tail pipe 131 is connected to the suction muffler 125. Since the foam extends upward from the upper part, the foam foamed by forming becomes difficult to reach the suction port 141 of the tail tube 131 and is hardly sucked from the suction port 141.

  On the other hand, since the auxiliary suction port 132 of the auxiliary tail pipe 133 is located at the bottom of the suction muffler 125, bubbles generated by the foaming of the auxiliary tail pipe 133 are larger than the suction port 141 of the tail pipe 131 extending above the suction muffler 125. It is easy to reach the auxiliary suction port 132. Therefore, in the present embodiment, the auxiliary suction port 132 of the auxiliary tail pipe 133 is made smaller in cross-sectional area than the tail pipe 131, so that the suction resistance is larger than that of the tail pipe 131. Is difficult to pass through the auxiliary inlet 132 of the auxiliary tail tube 133.

  The liquid here is not only the foam generated by the forming, but also the liquid refrigerant and the lubricating oil 103. The liquid refrigerant and a large amount of the lubricating oil 103 that are opened in the sealed container 101 through the suction pipe 113 are also supplementary tails. It is possible to make it difficult to pass through the auxiliary inlet 132 of the tube 133.

  Furthermore, since the auxiliary resonator 139 opened downward is provided on the line extending upward in the silencing space 127 of the auxiliary tail tube 133, the opening in the silencing space 127 of the auxiliary tail tube 133 and the auxiliary resonator 139 are provided. By making the distance between the openings close to each other, noise such as the pulsation sound of the refrigerant 134 is not only silenced by the auxiliary resonator 139 but also from the opening in the silence space 127 of the auxiliary tail pipe 133 to the silence space 127. By narrowing the flow path, it is possible to make it less likely to pass bubbles, liquid refrigerant, and lubricating oil 103 generated by forming.

  Therefore, the foam and the lubricating oil 103 generated by forming can be suppressed from flowing into the compression chamber 115 from the tail tube 131 and the auxiliary tail tube 133 without being almost sucked into the sound deadening space 127. In addition to providing reliability, the auxiliary resonator 139 can muffle the pulsating sound of the refrigerant 134 and prevent noise from leaking from the auxiliary tail tube 133 into the sealed container 101, thus reducing noise. it can.

  In addition, the fine lubricating oil 103 is scattered together with the refrigerant 134 in the sealed container 101 and is sucked together with the refrigerant 134 from the tail pipe 131 and the auxiliary tail pipe 133 into the noise reduction space 127, and the fine lubricating oil 103 is absorbed in the noise reduction space. It adheres to the wall surface and bottom surface in 127. The lubricating oil 103 adhering to the wall surface may stay on the wall surface during the operation of the compressor. However, when the compressor stops, most of it flows down the wall surface and accumulates at the bottom.

  If the lubricating oil 103 accumulates at the bottom of the suction muffler 125, the silencing effect of the silencing space 127 is reduced, and a large amount of the lubricating oil 103 may be sucked into the compression chamber 115 from the communication pipe 129. is there.

  In this embodiment, since the opening on the closed container 101 side of the auxiliary tail pipe 133 is at the bottom of the suction muffler 125, the lubricating oil 103 attached to the inner wall surface of the auxiliary tail pipe 133 or the auxiliary resonator 139 is applied to the auxiliary tail pipe 133. It can be discharged into the sealed container 101 from the opening on the closed container 101 side, and the flow of the lubricating oil 103 into the compression chamber 115 can be suppressed.

  Therefore, the lubricating oil 103 is not accumulated in the auxiliary tail pipe 133 when the compressor is stopped, and can be prevented from flowing into the compression chamber 115, so that high reliability is obtained.

  As described above, the auxiliary suction port 132 of the auxiliary tail pipe 133 has a smaller cross-sectional area than that of the tail pipe 131. However, it is necessary to secure a cross-sectional area sufficient to discharge the lubricating oil. It goes without saying that there is.

  As described above, since the hermetic compressor according to the present invention can be provided with high efficiency and reliability, it can be applied to a hermetic compressor used in an air conditioner, a refrigerator-freezer, and the like.

1 is a longitudinal sectional view of a side surface of a hermetic compressor according to Embodiment 1 of the present invention. Front longitudinal sectional view of the hermetic compressor in the same embodiment Main part enlarged view in the same embodiment Comparison of characteristics of hermetic compressor in the same embodiment Vertical section of a conventional hermetic compressor Top view of conventional hermetic compressor Main section enlarged sectional view of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 103 Lubricating oil 105 Stator 107 Rotor 109 Electric element 111 Compression element 113 Suction pipe 115 Compression chamber 117 Cylinder 121 Suction hole 123 Valve plate 125 Suction muffler 127 Silencer space 129 Communication pipe 131 Tail pipe 132 Auxiliary inlet 133 Auxiliary Tail tube 134 Refrigerant 135 Refrigerant receiving part 139 Auxiliary resonator 141 Inlet 143 Outlet 145 Opening surface

Claims (7)

  In the sealed container, an electric element composed of a stator and a rotor, and a compression element driven by the electric element are stored and lubricating oil is stored, and the closed container has an opening that opens one end into the sealed container. The compression element includes a cylinder that forms a compression chamber, a valve plate that seals an end of the cylinder and that forms a suction hole, and a silencing space that communicates with the cylinder. A suction muffler, wherein the suction muffler communicates the suction hole provided in the valve plate and the silencing space, and the space in the sealed container above the suction pipe and the silencing space. A tail pipe that includes a discharge port that opens into the muffler space, and a suction port that opens into a space within the sealed container, the discharge port being more than the suction port. Hermetic compressor wherein the area is large.   2. The hermetic compressor according to claim 1, wherein the inner periphery of the tail tube has a tapered shape in which a discharge port has a larger cross-sectional area than a suction port.   The hermetic compressor according to claim 1, wherein the tail pipe extends upward from an upper portion of the suction muffler.   An auxiliary tail pipe that is integrally formed on the inner wall of the suction muffler, has an auxiliary suction port that opens into the space in the sealed container at the bottom of the suction muffler, extends upward in the silencing space, and opens into the silencing space The discharge port of the tail pipe is arranged between the opening in the silencing space of the auxiliary tail pipe and the opening in the silencing space of the communication pipe. The hermetic compressor as described.   The auxiliary suction port of the auxiliary tail pipe has a smaller cross-sectional area than the tail pipe, sucks the refrigerant from the space in the sealed container into the sound deadening space, and discharges the lubricating oil staying in the sound deadening space to the space in the airtight container. The hermetic compressor according to claim 4.   6. The hermetic compressor according to claim 4, wherein an auxiliary resonator opened downward is provided on a line extending upward in the silencing space of the auxiliary tail pipe.   The suction muffler includes a refrigerant receiving part that surrounds the auxiliary suction port of the auxiliary tail pipe and has an opening surface on a side facing the opening end of the suction pipe, and the lower end of the opening surface of the refrigerant receiving part is the opening end of the suction pipe. The hermetic compressor according to any one of claims 4 to 6, wherein the hermetic compressor is disposed below the lower end.