JP2015140737A - Hermetic compressor and refrigerator using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of easily improving suction performance and further enhancing compression efficiency in a cylinder chamber with an inexpensive structure.SOLUTION: A hermetic compressor according to the present invention is configured so that a concave portion (32) formed at a position for avoiding the interference of a cylinder (4) with a tip end of a connecting rod at a time of assembling the connecting rod with the cylinder (4) is disposed in part of a sidewall of a bottom of the cylinder (4), and a suction portion (34) closed by the sidewall of a piston in a compression process of the piston and communicating an interior of a cylinder chamber with an interior of a hermetic vessel in a suction step of the piston is formed continuous to the concave portion (32).

Description

  The present invention relates to an electric hermetic compressor used in a refrigeration system for home appliances and a refrigerator using the same.

  In general, in this type of refrigeration system, refrigerant gas is compressed by a hermetic compressor and sent as a high-pressure gas to a condenser on the discharge side, where the high-pressure gas is condensed and decompressed via an expansion valve of a decompression mechanism. Then, it is sent to the evaporator, and the evaporator has a cycle function that repeats compression again by evaporating the decompressed low-pressure gas and sucking it into the suction side of the hermetic compressor.

  As a hermetic compressor applied to such a refrigeration system, for example, “a hermetic compressor and a piston compressor that uses a reduced amount of lubricating oil sucked into a cylinder and improved lubricity of a piston sliding surface” are used. "Refrigerator" (see Patent Document 1).

JP 2012-36847 A

  The main part of the compression element in the hermetic compressor according to Patent Document 1 described above is closed with a valve seat at the open end of the cylinder and covered with a valve cover, and the valve cover opens one space by an internal partition. In addition to the suction chamber and the other space serving as the discharge chamber, the suction port and discharge port of the valve seat are opened and closed by the suction valve and the discharge valve, respectively, and communicate with the suction chamber and the discharge chamber. The refrigerant gas that is led and filled in the sealed case during the reciprocating motion is guided to the suction chamber of the valve cover, and the compressed refrigerant gas is sucked into the cylinder chamber of the cylinder along with the reciprocating motion of the piston. Furthermore, in practical use, the valve cover suction chamber and discharge chamber are connected to the suction silencer and the discharge silencer having openings through the respective communication paths. Since the refrigerant gas is a gas flow path structure that is sucked into the cylinder chamber through the suction chamber of the valve cover through one communication path from the opening of the suction silencer, there is a limit to the suction performance in the cylinder chamber, There is a problem that it is difficult to further improve the compression efficiency.

  The present invention has been made to solve such problems, and its technical problem is that it is suitable for a refrigeration system for home appliances that can further improve the compression efficiency by simply increasing the suction performance in the cylinder chamber with an inexpensive structure. Another object of the present invention is to provide a hermetic compressor and a refrigerator using the same.

  In order to achieve the above technical problem, the present invention includes an electric element housed in an airtight container and a compression element, and the compression element includes a cylinder, a piston that reciprocates in the cylinder, and a connecting rod. A valve seat having a suction port and a discharge port with respect to the opening end surface of the top of the cylinder, and a suction valve and a discharge valve for controlling the inflow and outflow of refrigerant gas at the suction port and the discharge port, respectively And a valve seat cover to form a cylinder chamber, the tip of the connecting rod when the connecting rod is assembled to the cylinder on a part of the side wall on the bottom side of the cylinder A recess formed at a position that avoids interference with the piston, and is closed by the side wall of the piston in the piston compression process, and in the cylinder chamber and the sealed container in the piston suction process. It is characterized in that the suction portion for communicating and formed to be continuous with the recess a.

  According to the hermetic compressor of the present invention, a valve for opening and closing the suction passage is provided in addition to the existing gas suction passage for sucking low-pressure refrigerant gas into the cylinder chamber through the suction port of the valve seat installed on the piston top dead center side. A suction part that connects the cylinder chamber and the inside of the sealed container in the piston suction process (for example, near the bottom dead center of the piston) is provided continuously with the recess so that the suction performance in the cylinder chamber can be easily achieved with an inexpensive structure. The compression efficiency can be further improved. As a result, the circulation amount of the refrigerant gas in the refrigeration cycle is increased, the heat exchange performance is improved, and the application to the refrigeration system for home appliances is suitable, and the refrigeration performance in the refrigerator equipped with the refrigeration system for home appliances is improved. It can contribute to improvement. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a schematic structure of a hermetic compressor according to a first embodiment of the present invention as a cross section in a vertical direction. It is the schematic diagram which showed the principal part structure of the compression element which concerns on the known hermetic compressor incorporated in the refrigeration system for household appliances. It is the schematic diagram which showed the principal part structure of the compression element which concerns on the hermetic compressor shown in FIG. 1 integrated in the refrigeration system for household appliances. FIG. 4 is a schematic diagram showing a change in the flow of refrigerant gas during one cycle of the compression / suction operation in the main structure of the compression element shown in FIG. 3, and (a) shows the discharge path in the compression process when the top dead center is reached. The figure which showed the mode of discharge, (b) is the figure which showed the mode of inhalation in the existing inhalation route in the inhalation process in the middle of the bottom dead center side movement, (c) is the inhalation process when the bottom dead center is reached It is the figure which showed the mode of the suction | inhalation which match | combined the suction in a suction part, (d) The figure which showed the mode of discharge in the discharge path | route in the compression process in the middle of a top dead center side movement. FIG. 4 is a perspective view showing details of the cylinder of FIG. 3 and a recess provided in the cylinder and a suction portion. It is the external view which looked at the cylinder of FIG. 5, a recess, and the suction part from the side. It is a perspective view which shows the detail of the cylinder of the sealed compressor which concerns on Example 2 of this invention, a recess, and a suction part. It is the external view which looked at the cylinder, the recess, and the suction part of the hermetic compressor concerning Example 3 of the present invention from the side. It is the external view which looked at the cylinder, the recess, and the suction part of the hermetic compressor concerning Example 4 of the present invention from the side.

  Hereinafter, embodiments of a hermetic compressor of the present invention and a refrigerator using the same will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing a schematic structure of a hermetic compressor 50 according to a first embodiment of the present invention in a cross section in the vertical direction. The hermetic electric compressor 50 is similar to that disclosed in Patent Document 1 in terms of schematic structure, and an electric element in which a shaft 10 is arranged at the vertical axis in the center of the hermetic container 1 and arranged at the lower part. 7 is a structure which rotationally drives the compression element 6 arrange | positioned in the upper part. The compression element 6 here is composed of a reciprocating compressor in which a piston 5 reciprocates in a cylinder 4 formed integrally with the frame 3. A crankpin 11 is provided at a position eccentric from the rotation center of the shaft 10 and reciprocates the piston 5. The electric element 7 disposed below the compression element 6 has a stator 8 and a rotor 9.

  The shaft 10 extends through the bearing portion 2 held at the intermediate portion of the frame 3 and extends downward and upward of the frame 3, and the crank pin 11 is located on the upper side of the frame 3. A rotor 9 is fixedly attached to the lower part of the shaft 10. The shaft 10 is rotated by the power generated between the stator 8 and the rotor 9 of the electric element 7. The crankpin 11 and the piston 5 are connected by a connecting rod 12, and the rotational movement of the crankpin 11 is converted into the reciprocating motion of the piston 5 through the connecting rod 12.

  Lubricating oil 14 is stored at the bottom of the sealed container 1. When the shaft 10 rotates, the lubricating oil 14 passes through the lubricating oil passage 22 formed in the shaft 10 from the upper end portion of the oil supply piece 20 by the pump action of the oil supply piece 20 attached to the lower end portion of the shaft 10. 10 to the outer periphery. Thereafter, the shaft 10 enters the shaft 10 again from the outer peripheral spiral groove 21 formed in the outer peripheral portion of the shaft 10, and is ejected from the upper end portion of the shaft 10 as a flow of the lubricating oil 14 as indicated by the arrow 23.

  A part of the flow of the lubricating oil 14 flows into the cylinder 4. The opening end surface of the top of the cylinder 4 (the top dead center side of the piston 5) is closed by a valve seat 15 and covered with a valve cover (valve seat cover) 16. When the electric element 7 is energized and the shaft 10 is rotationally driven, the piston 5 reciprocates in the cylinder 4 via the connecting rod 12 and the ball joint mechanism portion 12e.

  In addition, in the hermetic compressor 50 according to the first embodiment, the piston 5 that reciprocates in the cylinder chamber of the cylinder 4 is blocked by the side wall of the main body of the piston 5, and the piston chamber 5 is closed by the suction step of the piston 5. In order to communicate with the inside of the sealed container 1, the cylinder 4 (block) is provided with a suction portion 34. More specifically, a recess 32 is formed in a part of the side wall on the bottom side of the cylinder 4 (the bottom dead center side of the piston 5), and the suction portion 34 is formed so as to form a through hole continuous with the recess 32. Provided (see FIG. 5).

  When connecting and assembling the connecting rod 12 and the piston 5 due to the assembly structure of the compressor, to prevent the small end portion (tip portion) of the connecting rod 12 from interfering with the side wall of the cylinder 4. However, the above-mentioned recess 32 is provided for this purpose.

  FIG. 2 is a schematic diagram showing a main structure of a compression element 6 ′ related to a known hermetic compressor 50 ′ incorporated in a general refrigeration system for home appliances as a comparison. The refrigeration system here uses a well-known hermetic compressor 50 ′ that does not have a suction portion that penetrates the side wall of the cylinder 4. The condenser 100 is provided on the discharge side thereof, and the evaporator 110 is provided on the suction side. Are arranged, and an expansion valve 120 of a pressure reducing mechanism is interposed between the condenser 100 and the evaporator 110, and after the refrigerant gas is sealed, each part is connected by piping.

  As for the main structure of the compression element 6 ′ in the hermetic compressor 50 ′, the valve seat 15 is installed on the opening end face of the cylinder 4 to close the cylinder chamber. The valve seat 15 itself has a suction port 15 a and a discharge port. An outlet 15b is provided, and the suction port 15a and the discharge port 15b are opened and closed by opening and closing operations of the suction valve 15c and the discharge valve 15d, respectively.

  The valve cover 16 is provided with a partition portion that bisects the inside, and one of the spaces forms a suction chamber 16a and the other space forms a discharge chamber 16b. That is, the valve cover 16 covers the valve seat 15 with a structure formed by partitioning the suction chamber 16a and the discharge chamber 16b. In the valve seat 15, the suction port 15a communicates with the suction chamber 16a when the suction valve 15c is opened, and the discharge port 15b communicates with the discharge chamber 16b when the discharge valve 15d is opened. The suction chamber 16a and the discharge chamber 16b of the valve cover 16 are connected to the suction silencer 30 and the discharge silencer 35 having the opening 33 via the communication paths 31a and 31b, respectively.

  In this hermetic compressor 50 ′, when the electric element 7 is energized and the shaft 10 is driven to rotate, the piston 5 reciprocates in the cylinder 4 chamber and enters the hermetic container 1 from the evaporator 100 via the suction pipe 28. The low-pressure refrigerant gas that has been led and filled is led from the opening 33 into the suction chamber 16a in the valve cover 16 through the suction silencer 30 and the communication passage 31a, and the cylinder 4 is reciprocated as the piston 5 reciprocates. The refrigerant gas, which has been sucked into the cylinder chamber and compressed and then discharged to the discharge chamber 16b in the valve cover 16, is discharged through the discharge pipe 29 via the communication passage 31b and the discharge silencer 35. Led to 100.

  However, according to this hermetic compressor 50 ′, the low-pressure refrigerant gas is sucked into the cylinder chamber from the opening 33 of the suction silencer 30 through the one communication passage 31 a and the suction chamber 16 a of the valve cover 16. Due to the gas flow path structure, there is a limit to the suction performance in the cylinder chamber, and it is difficult to further improve the compression efficiency. Therefore, in the hermetic compressor 50 according to the first embodiment of the present invention, attention has been paid to the problem of further improving the compression efficiency by simply increasing the suction performance in the cylinder chamber with an inexpensive structure.

  FIG. 3 is a schematic diagram showing the main structure of the compression element 6 according to the hermetic compressor 50 of Example 1 incorporated in the refrigeration system for home appliances. The main part structure of the compression element 6 in the hermetic compressor 50 is the side wall of the main body of the piston 5 in the compression process of the piston 5 as compared with the main part structure of the compression structure 6 in the hermetic compressor 50 'shown in FIG. In order to connect the cylinder chamber and the closed container 1 in the suction process of the piston 5, the cylinder 4 (block) is partially cut out from the side wall of the cylinder 4 (block) so as to be continuous with the recess 32. The difference is that a suction portion 34 is formed. The shape and the like of the suction part 34 will be described in detail later with reference to FIGS. In addition, since the other detailed structure is the same, the same referential mark is attached | subjected to the same component and description is abbreviate | omitted.

  Hereinafter, the suction path of the hermetic compressor 50 in the refrigeration system shown in FIG. 3 will be described. The suction pipe 28 of the refrigeration system has one end connected to the sealed container 1 and the other end connected to the evaporator 110, and the low-pressure refrigerant gas evaporated by the evaporator 110 as described above is sealed container 1. Into the inside. The refrigerant gas that has flowed into the sealed container 1 flows into the suction silencer 30 through the opening 33 of the suction silencer 30 that opens into the sealed container 1, and then the suction chamber 16a of the valve cover 16 through the communication path 31a. And the suction port 15a of the valve seat 15 is sucked into the cylinder chamber of the cylinder 4.

  The suction portion 34 that directly communicates the inside of the sealed container 1 and the cylinder chamber of the cylinder 4 is installed so as to open near the bottom dead center where the piston 5 reciprocates in the cylinder chamber. The low-pressure refrigerant gas is sucked into the cylinder chamber of the cylinder 4 through the suction portion 34 in addition to the communication passage 31a.

  Next, the discharge path of the hermetic compressor 50 will be described. The refrigerant gas flowing into the cylinder chamber of the cylinder 4 is compressed to a high pressure by the piston 5 and discharged from the cylinder chamber to the discharge chamber 16b of the valve cover 16 through the discharge port 15b of the valve seat 15, and then passes through the communication passage 31b. And flows into the condenser 100 through the discharge silencer 35 and the discharge pipe 29.

  In the hermetic compressor 50 according to the first embodiment, when the electric element 7 is energized, the shaft 10 is rotated by the power generated between the stator 8 and the rotor 9 of the electric element 7, and the crank installed on the shaft 10. As the pin 11 rotates eccentrically, the piston 5 connected to the crank pin 11 reciprocates in the cylinder chamber of the cylinder 4.

  FIG. 4 is a schematic diagram showing a change in the flow of the refrigerant gas accompanying one cycle of the compression suction operation in the main structure of the compression element 6 described in FIG. 3, and FIG. The figure which showed the mode of discharge in the discharge path | route in the compression process of this, The figure (b) is the figure which showed the mode of suction | inhalation in the existing suction | inhalation path | route in the suction process in the middle of the bottom dead center side movement, The figure (c) ) Is a view showing a state of inhalation combined with inhalation in the route of the suction part 34 in the inhalation step when reaching the bottom dead center, and FIG. 9 (d) is ejection in the ejection route in the compression step in the middle of movement at the top dead center side. It is the figure which showed the mode of.

  When the piston 5 reciprocating in the cylinder chamber of the cylinder 4 has reached the top dead center in the compression process of moving from the bottom dead center toward the top dead center, referring to FIG. Closes the suction port 15a, whereas the discharge valve 15d opens the discharge port 15b. Therefore, the refrigerant gas compressed to a high pressure by the piston 5 is discharged from the cylinder chamber of the cylinder 4 to the discharge chamber 16b through the discharge port 15b, and further into the discharge pipe 29 via the communication passage 32b and the discharge silencer 35. Leaked.

  Here, since the suction valve 15c closes the suction port 15a, the high-pressure refrigerant gas in the cylinder chamber is prevented from flowing back to the suction chamber 16a, and at the position where the piston 5 reaches the top dead center, Since the suction part 34 connected to the room is closed by the side wall of the piston 5, the refrigerant gas compressed in the cylinder chamber can be prevented from flowing back into the sealed container 1 through the suction part 34.

  Further, in the piston suction process in which the piston 5 moves from the top dead center toward the bottom dead center, referring to FIG. 4B, the discharge valve 15d closes the discharge port 15b, whereas the suction valve 15c. Opens the inlet 15a. Therefore, low-pressure refrigerant gas flows into the cylinder chamber of the cylinder 4 from the opening 33 of the suction silencer 30 through the suction port 15a via the communication passage 31a and the suction chamber 16a.

  Here, the inside of the cylinder chamber of the cylinder 4 has a negative pressure. In this state, the discharge valve 15d closes the discharge port 15b to prevent the high-pressure refrigerant gas in the discharge chamber 16b from flowing back into the cylinder chamber, The suction valve 15c that has closed the port 15a is opened so that low-pressure refrigerant gas flows into the cylinder chamber from the suction chamber 16a. However, here, since the piston 5 is located between the top dead center and the bottom dead center, and the suction part 34 connected to the cylinder chamber is still blocked by the side wall of the piston 5, the refrigerant gas passes through the suction part 34 to the cylinder. The patient is not inhaled into the room.

  Further, when the position of the piston 5 is near the bottom dead center, the suction portion 34 that has been closed by the side wall of the piston 5 is looked into the cylinder chamber until the piston 5 reaches the bottom dead center. Referring to (c), the low-pressure refrigerant gas in the hermetic container 1 is separately introduced into the cylinder chamber through the suction portion 34 as a new suction path, and the amount of gas suction is increased and the suction performance is improved. improves.

  In the subsequent compression process in which the piston 5 moves from the bottom dead center toward the top dead center, referring to FIG. 4 (d), the suction valve 15c again closes the suction port 15a, and the discharge valve 15d becomes the discharge port 15b. The refrigerant gas compressed to a high pressure by the piston 5 is discharged from the cylinder chamber of the cylinder 4 to the discharge chamber 16b through the discharge port 15b, and is further discharged into the discharge pipe 29 via the communication passage 32b and the discharge silencer 35. Let it flow into.

  Here, when the refrigerant gas in the cylinder chamber increases in pressure as the position of the piston 5 approaches top dead center and reaches the discharge pressure of the designed value, the discharge valve 15d that has closed the discharge port 15b is opened to be compressed in the cylinder chamber. The refrigerant gas discharged is discharged into the discharge chamber 16b. However, here, the piston 5 is located between the bottom dead center and the top dead center, and the suction part 34 connected to the cylinder chamber is closed again by the side wall of the piston 5, so that the refrigerant gas compressed in the cylinder chamber is sucked. It is in a state where it does not flow back into the sealed container 1 through the part 34.

  In the structure of the main part of the compression element 6, the cycle related to the discharge and suction operations by the compression accompanying the reciprocation of the piston 5 is repeated, and the suction performance in the cylinder chamber of the cylinder 4 is efficiently sucked in by the low-pressure refrigerant gas. By increasing the compression efficiency, the compression efficiency can be improved.

  In the hermetic compressor 50 according to the first embodiment, in the suction control of the refrigerant gas into the cylinder chamber of the cylinder 4, the suction from the suction port 15a of the valve seat 15 disposed on the top dead center side of the piston 5 is the suction valve. In contrast to the control by opening and closing 15c, the suction from the suction portion 34 has a structure in which the opening is exposed or closed by the movement of the piston 5 itself to control the refrigerant gas, and suction through the side wall of the cylinder 4 is performed. The opening of the portion 34 is provided in the vicinity of the bottom dead center where the speed of movement of the piston 5 becomes slow.

  Therefore, the amount of refrigerant gas sucked into the cylinder chamber from the opening of the suction portion 34 is larger than that in the conventional structure described with reference to FIG. 2, and the suction performance into the cylinder chamber is enhanced. Compression efficiency can be improved. As a result, the circulation amount of the refrigerant gas in the refrigeration cycle circulating in the refrigeration system is increased, and the refrigeration function by heat exchange in the evaporator 110 can be improved.

  Further, since the suction portion 34 has a structure that is exposed or closed by the movement of the piston 5 itself, a loss such as an opening delay or a closing delay as in the case of the opening / closing control of the elastic suction valve 15c is not generated. This also improves the compression efficiency.

  Next, the structure of the suction portion 34 will be described with reference to the perspective view of the cylinder of FIG. 5 and the external view of FIG. As shown in FIG. 5, the recess 32 has a structure in which the side wall of the cylinder 4 body is formed by partially cutting away the range near the center of the cylinder length from the rear end. The position of the recess 32 is the left side when viewed from the bottom side of the cylinder 4. The shape and size of the recess 32 is such that when the connecting rod 12 is connected to the shaft 10, the small end portion (tip portion) of the connecting rod 12 is inserted into the cylinder 4 when the shaft 10 is inserted into the bearing portion 2 from above. The shape and size are such that they do not interfere with the side walls.

  The suction portion 34 is provided continuously from the tip of the recess 32 to the top side of the cylinder 4. As shown in FIGS. 5 and 6, the width of the suction portion 34 (the width in the circumferential direction of the cylinder 4) is narrower than the width of the recess 32. That is, the shape formed by the suction portion 34 and the recess 32 is a substantially convex shape in which the width on the top side (front end side) of the cylinder 4 is narrow and the width on the bottom side (rear end side) is wide. Therefore, when the compressor is assembled, the connecting rod 12 and the piston 5 can be connected and assembled by inserting the small end of the connecting rod 12 into the wide-cut portion as described above.

  Further, when the piston 5 is located at the bottom dead center in the suction process, the suction part 34 communicates the inside of the sealed container 1 and the cylinder chamber of the cylinder so that the refrigerant gas filled in the sealed container 1 is sucked into the cylinder chamber. It has a structure to do. Here, in the first embodiment, it is not necessary to add a new process for installing the suction portion 34, and it can be easily installed because it can be formed at the stage of the casting material.

  Incidentally, the suction part 34 itself may basically have a function of accelerating the suction of the refrigerant gas by communicating the cylinder chamber of the cylinder 4 and the inside of the sealed container 1, so that the inside of the sealed container 1 disclosed in the first embodiment. In addition to a form in which the cylinder chamber is directly communicated with the cylinder chamber, a communication path for connecting the inside of the suction silencer 30 and the suction portion 34 may be provided.

  In addition, since the lubricating oil 14 sprayed on the upper surface of the cylinder 4 is taken into the cylinder chamber intermittently and momentarily from the suction portion 34 slightly in the middle of the flow, the oil supply between the piston and the cylinder is improved and the compressor is highly reliable. Also contributes to sex.

  In any case, according to the hermetic compressor 50 according to the first embodiment, the existing gas suction for sucking the low-pressure refrigerant gas into the cylinder chamber through the suction port 15a of the valve seat 15 installed on the top dead center side of the piston 5. In addition to the passage, the piston 5 has a suction part 34 that works in the suction process of the piston 5 in the vicinity of the bottom dead center of the piston 5 and does not have an opening / closing valve that penetrates the side wall of the cylinder 4. The performance can be improved and the compression efficiency can be further improved. As a result, when applied to a refrigeration system for home appliances, the circulation amount of refrigerant gas in the refrigeration cycle is increased, and the heat exchange performance in the evaporator 110 is improved, contributing to the improvement of the refrigeration performance in a refrigerator equipped with such a refrigeration system. It can also contribute to the high reliability of the compressor.

  Note that, when a refrigeration system including such a hermetic compressor 50 is mounted in a refrigerator, for example, the configuration described with reference to FIG. .

  FIG. 7 is a perspective view illustrating details of a cylinder, a recess, and a suction portion of the hermetic compressor according to the second embodiment of the present invention. As shown in FIG. 7, the second embodiment is different from the first embodiment in that the positions of the recess 32 and the suction portion 34 are provided on the upper side when viewed from the bottom side of the cylinder 4. Even with this configuration, the same effects as those of the first embodiment can be obtained. Moreover, according to the second embodiment, since the recess 32 is formed on the upper side of the side wall of the cylinder 4, when the shaft 10 connected to the connecting rod 12 is inserted into the bearing portion 2 from above, the connecting rod 12 There is no need to change the direction. That is, there is an advantage that one assembling process can be reduced compared to the first embodiment.

  FIG. 8 is an external view of the cylinder, the recess, and the suction portion of the hermetic compressor according to the third embodiment of the present invention as viewed from the side. As shown in FIG. 8, in Example 3, the suction part 134 and the recess 34 are formed with the same width. According to this example, in addition to being able to obtain the same operational effects as in the first embodiment, there is an advantage that the suction part 134 can be easily manufactured.

  FIG. 9 is an external view of a cylinder, a recess, and a suction portion of a hermetic compressor according to a fourth embodiment of the present invention as viewed from the side. As shown in FIG. 9, the fourth embodiment is characterized in that the width of the suction part 234 is wider than the width of the recess 34. According to this example, in addition to being able to obtain the same operational effects as in the first embodiment, the opening area of the suction portion 234 is larger than those in the first to third embodiments. It is effective.

  As described above, according to each of the above-described embodiments, the refrigerant gas can be sucked also from the suction portion, so that the compression efficiency is increased. In addition, the performance of the hermetic compressor can be improved with a simple configuration in which only the suction portion is provided. As a result, it can also contribute to the improvement of the refrigerating performance of the refrigerator equipped with the hermetic compressor according to each embodiment.

  In addition, the Example mentioned above is an illustration for description of this invention, and is not the meaning which limits the scope of the present invention only to those Examples. Those skilled in the art can implement the present invention in various other modes without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Airtight container 4 Cylinder 5 Piston 6, 6 'Compression element 7 Electric element 8 Stator 9 Rotor 10 Shaft 11 Crankpin 12 Connecting rod 15 Valve seat 15a Intake port 15b Discharge port 15c Intake valve 15d Discharge valve 16 Valve cover (Valve seat) cover)
16a suction chamber 16b discharge chamber 32 recess 33 opening 34, 134, 234 suction portion 50, 50 'hermetic compressor

Claims (6)

An electric element housed in a hermetic container; and a compression element. The compression element has a cylinder, a piston that reciprocates in the cylinder, and a connecting rod. And a valve seat having a suction port and a discharge port, and a suction valve, a discharge valve, and a valve seat cover for controlling the inflow and outflow of the refrigerant gas at the suction port and the discharge port, respectively, and mounting the cylinder chamber A formed hermetic compressor,
In a part of the side wall on the bottom side of the cylinder, a recess is formed at a position that avoids interference with the tip of the connecting rod when the connecting rod is assembled to the cylinder.
In the compression process of the piston, the side wall of the piston is blocked, and in the suction process of the piston, a suction portion for communicating the cylinder chamber and the closed container is formed to be continuous with the recess. A hermetic compressor characterized by The hermetic compressor according to claim 1, wherein
A hermetic compressor, wherein the cylinder chamber and the sealed container communicate with each other via the suction portion when the piston is positioned near the bottom dead center. The hermetic compressor according to claim 1 or 2,
The hermetic compressor, wherein the suction portion has a narrower width in the circumferential direction of the cylinder than the recess. The hermetic compressor according to claim 1 or 2,
The hermetic compressor is characterized in that the suction portion has substantially the same width in the circumferential direction of the recess and the cylinder. The hermetic compressor according to claim 1 or 2,
The hermetic compressor, wherein the suction portion is wider in the circumferential direction of the cylinder than the recess. A refrigerator having a refrigeration cycle, wherein the hermetic compressor according to any one of claims 1 to 5 is used as a compressor of the refrigeration cycle.

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