JP6259498B2 - Hermetic compressor and refrigeration system - Google Patents

Description

  The present invention relates to a hermetic compressor used in a refrigeration cycle such as various refrigeration apparatuses, and a refrigeration apparatus using the same.

  A refrigeration apparatus having a refrigeration cycle is widely used for home use or business use as an electric refrigerator-freezer for home use or a showcase. In recent years, the demand for protection of the global environment has been increasing, and there is a strong demand for higher efficiency in hermetic compressors used in refrigeration cycles.

  Conventionally, as a technique for preventing a decrease in compression efficiency in a hermetic compressor, for example, an air compressor disclosed in Patent Document 1 is known. This air compressor has a configuration in which a discharge chamber and a suction chamber are provided in a cylinder head, and a peripheral wall forming each is separated by a cooling groove.

  Specifically, as shown in FIG. 7, the air compressor disclosed in Patent Document 1 includes a piston 512, a cylinder 513, a valve seat plate 514, a cylinder head 518, a suction valve 529, a discharge valve 531 and the like. Yes.

  The piston 512 reciprocates in the cylinder 513. A valve seat plate 514 is provided on the end surface of the cylinder 513. The valve seat plate 514 has a suction port 528 and a discharge port (not shown), and a suction valve 529 and a discharge valve 531 are provided. . The suction port 528 is opened and closed by a suction valve 529, and the discharge port is opened and closed by a discharge valve 531. A cylinder head 518 is provided on the valve seat plate 514, and the cylinder head 518 has a suction chamber 515 that communicates with the suction port 528 and a discharge chamber 516 that communicates with the discharge port.

  The cylinder head 518 is made of a single member, and is fixed to the cylinder 513 together with the valve seat plate 514. The suction chamber 515 is formed close to one side of the cylinder head 518 by the peripheral wall 525. The discharge chamber 516 is formed by a peripheral wall 517 that surrounds the peripheral wall 525 that forms the suction chamber 515 and that extends over the entire top surface of the cylinder head 518. A deeply cut cooling groove 526 is formed between the peripheral wall 525 and the peripheral wall 517.

Japanese Patent No. 2688809

  However, in the conventional configuration, since the cylinder head 518 is formed of a single member, the peripheral wall 525 that forms the suction chamber 515 and the peripheral wall 517 that forms the discharge chamber 516 even if the cooling groove 526 is formed. Are connected to each other. Therefore, when the peripheral wall 517 is heated by the high-temperature refrigerant gas in the discharge chamber 516, the heat of the peripheral wall 517 is transferred to the peripheral wall 525, and the peripheral wall 525 becomes high temperature. Thereby, since the refrigerant gas sucked into the suction chamber 515 is also heated, there is a problem that the volume efficiency is lowered.

  The valve seat plate 514 is provided with a suction port 528, but the valve seat plate 514 is also heated by the refrigerant gas in the discharge chamber 516 and the compressed refrigerant gas in the cylinder 513. As a result, the sucked refrigerant gas is also heated by the heat of the valve seat plate 514, so that the volumetric efficiency is reduced as described above.

  The present invention has been made to solve such a problem, and by suppressing the temperature rise of the sucked refrigerant gas, the volumetric efficiency is effectively suppressed from being lowered, and the highly efficient hermetic compressor The purpose is to provide.

  In order to solve the above problems, a hermetic compressor according to the present invention is a hermetically sealed container whose inside is a sealed space, an electric element accommodated in the hermetic container, and the hermetic container. A compression element that is driven by the electric element and compresses the refrigerant gas, and the compression element is supported so that its axis is in the vertical direction, and is rotated by the electric element, and its axis Is provided so as to intersect the axial direction of the crankshaft, and a piston that reciprocates by rotation of the crankshaft and a compression chamber are formed therein, and the piston can reciprocate from one end thereof. The inserted cylinder, the other end of the cylinder are sealed, the valve plate in which the suction hole and the discharge hole are formed, and the other end of the cylinder A cylinder head that is fixed via a rubbing plate and has a discharge space that communicates with the discharge hole inside, and a communication pipe that is positioned below the cylinder and has a sound deadening space inside and is connected to the suction hole The communication pipe extends upward from the suction muffler toward the other end of the cylinder, and a communication pipe outlet portion communicating with the suction hole is provided at an upper end of the communication muffler. In the lower part of the cylinder head, a recessed portion for accommodating the communicating pipe outlet portion is provided, and a gas in the sealed container is a gap communicating with the sealed space between the communicating tube outlet portion and the recessed portion. The inflow space is provided.

  Moreover, the refrigeration apparatus according to the present invention has a refrigerant circuit in which the hermetic compressor, the radiator, the decompressor, and the heat absorber having the above-described configuration are connected in a ring shape by a pipe.

  The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

  In the present invention, by the above configuration, by suppressing the temperature rise of the sucked refrigerant gas, it is possible to effectively suppress a decrease in volumetric efficiency and to provide a highly efficient hermetic compressor. .

It is a typical longitudinal cross-sectional view which shows the typical structural example of the hermetic compressor which concerns on Embodiment 1 of this invention. It is a typical longitudinal cross-sectional view which expands and shows the structure of the dotted-line frame A in the hermetic compressor shown in FIG. FIG. 3 is a schematic longitudinal sectional view showing a more specific configuration of the cylinder head shown in FIG. 2. FIG. 2 is a schematic plan view showing a state in which the configurations of a cylinder head and an outlet portion of a suction muffler are viewed from the direction of a block arrow B in the hermetic compressor shown in FIG. 1. It is typical sectional drawing which shows the modification of the structure of the dotted-line frame A in the hermetic compressor shown in FIG. It is a schematic diagram explaining the basic composition of the freezing apparatus which concerns on Embodiment 2 of this invention. It is a longitudinal section which shows the example of composition near the cylinder head of the conventional air compressor.

  A hermetic compressor according to the present invention includes a hermetically sealed container whose inside is a sealed space, an electric element accommodated in the hermetically sealed container, and a refrigerant gas that is accommodated in the hermetic container and driven by the electric element. A compression element that compresses the crankshaft, and the compression element is supported so that its axis is in the vertical direction, and is driven to rotate by the electric element, and the axis is relative to the axial direction of the crankshaft. A piston that is reciprocated by the rotation of the crankshaft, a cylinder in which a compression chamber is formed, and the piston is inserted so as to be capable of reciprocating from one end thereof, and the cylinder The other end of the cylinder is sealed, and a valve plate having a suction hole and a discharge hole is formed and fixed to the other end of the cylinder via the valve plate. A cylinder head having a discharge space that communicates with the discharge hole inside, and a suction muffler that is located below the cylinder, has a sound deadening space inside, and includes a communication pipe connected to the suction hole. The communication pipe extends upward from the suction muffler toward the other end of the cylinder, and a communication pipe outlet portion communicating with the suction hole is provided at an upper end of the communication pipe. A recess for accommodating the communication pipe outlet portion is provided therein, and a gas inflow space in a sealed container, which is a gap communicating with the sealed space, is provided between the communication pipe outlet portion and the recess. It is a configuration.

  According to the said structure, the heat insulation layer called gas inflow space in airtight container is formed between a communicating pipe exit part and a cylinder head. Thereby, the heat transfer from a high temperature cylinder head to a communicating pipe exit part can be suppressed. Therefore, it is possible to suppress an increase in the temperature of the sucked refrigerant gas flowing through the communication pipe and effectively suppress a decrease in volumetric efficiency. As a result, the efficiency of the hermetic compressor can be improved.

  In the hermetic compressor having the above-described configuration, when the axial direction of the crankshaft is a vertical direction and the axial direction of the piston is a horizontal direction, the compressor is positioned below the discharge space, and the communication pipe outlet portion A first gap extending in the lateral direction so as to face the upper peripheral surface of the second, and a second gap extending in the vertical direction so as to face the side peripheral surface of the communication pipe outlet portion, The thickness of the first gap may be larger than the thickness of the second gap.

  According to the said structure, the 1st clearance gap is located in the head upper part side which includes discharge space among cylinder heads, and the 2nd clearance gap is located in the head lower part side among cylinder heads. Since the inside of the discharge space is at a higher temperature than the sealed space inside the sealed container, heat transfer from the discharge space having a large amount of heat can be effectively suppressed by increasing the thickness of the first gap. Therefore, the temperature rise of the refrigerant gas flowing through the communication pipe can be more effectively suppressed.

  In the hermetic compressor having the above-described configuration, the opening provided at the tip of the communication pipe outlet may be inserted into the suction hole.

  According to the above configuration, since the opening is inserted into the suction hole, the refrigerant gas flowing through the communication pipe outlet is sucked into the compression chamber from the opening without contacting the high temperature valve plate. Thereby, not only the temperature rise of the refrigerant gas can be suppressed by the gas inflow space in the sealed container, but also the temperature rise of the refrigerant gas due to heat transfer from the valve plate can be suppressed.

  In the hermetic compressor having the above-described configuration, the cylinder head is formed with a notch at a position corresponding to a projection surface obtained by projecting the suction hole in a lateral direction in a lower portion of the cylinder head. It may be a configuration.

  According to the said structure, the space by a notch part as well as the gas inflow space in an airtight container is formed between a cylinder head and a communicating pipe exit part. Thereby, the heat transfer from a high temperature cylinder head to a communicating pipe exit part can further be suppressed.

  Further, in the sealed compressor having the above configuration, the communication pipe outlet portion is provided with a heat insulating space isolated from the sealed space on the outer periphery facing the valve plate, and the heat insulating space and the The structure provided with the communicating hole which connects the inside of a communicating pipe exit part may be sufficient.

  According to the said structure, the heat insulation space into which refrigerant gas was introduce | transduced is formed between a communicating pipe exit part and a valve plate. Therefore, the heat insulation space can be maintained at a temperature similar to that of the refrigerant gas, and heat transfer from the valve plate to the communication pipe outlet can be further suppressed.

  In the hermetic compressor having the above-described configuration, the suction muffler may be molded using a resin, and the heat insulating space may be integrally formed when the suction muffler is molded.

  According to the above configuration, the heat insulating space is integrally provided as a part of the shape of the communication pipe at the time of resin molding of the suction muffler. Therefore, the heat insulation effect by the heat insulation space can be further improved.

  The hermetic compressor having the above-described configuration may be configured to be inverter-driven at a plurality of operating frequencies.

  According to the above configuration, even if the flow rate of the refrigerant gas passing through the communication pipe is slow, the temperature rise of the refrigerant gas is effectively suppressed by suppressing the heat transfer to the communication pipe outlet by the gas inflow space in the sealed container. be able to. Therefore, the efficiency of the hermetic compressor can be improved even when an operation frequency is used in which the inverter is driven at a low-speed rotation at which the flow rate of the refrigerant gas becomes slow.

  The present invention also includes a refrigeration apparatus having a refrigerant circuit in which the hermetic compressor having the above-described configuration, a radiator, a decompressor, and a heat absorber are connected in a ring shape by piping.

  According to the said structure, since the refrigerant circuit using the sealed compressor of the said structure is provided, the refrigeration apparatus which reduced power consumption and implement | achieved energy saving can be obtained.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment 1)
[Configuration example of hermetic compressor]
First, an example of a specific configuration of the hermetic compressor according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the hermetic compressor 100 according to the present embodiment includes an electric element 120 and a compression element 130 that are accommodated in a hermetic container 101, and a refrigerant gas is contained inside the hermetic container 101. And lubricating oil 103 is enclosed. The electric element 120 and the compression element 130 constitute a compressor body. The compressor main body is disposed in the sealed container 101 in a state where it is elastically supported by a suspension spring 102 provided at the bottom of the sealed container 101.

  The closed container 101 is provided with a suction pipe 104 and a discharge pipe 105. One end of the suction pipe 104 communicates with the internal space of the sealed container 101, and the other end is connected to a refrigeration apparatus (not shown) to constitute a refrigeration cycle. The discharge pipe 105 has one end connected to the compression element 130 and the other end connected to a refrigeration apparatus (not shown). As will be described later, the refrigerant gas compressed by the compression element 130 is guided to the refrigeration cycle via the discharge pipe 105, and the refrigerant gas from the refrigeration cycle is guided to the internal space of the sealed container 101 via the suction pipe 104. .

  Although the specific structure of the airtight container 101 is not specifically limited, In this Embodiment, it forms by drawing of an iron plate, for example. In the refrigeration cycle to which the hermetic compressor 100 is applied, the refrigerant gas sealed in the sealed container 101 is sealed in a relatively low temperature state at a pressure equivalent to that on the low pressure side. The lubricating oil 103 is sealed for lubrication of a crankshaft 140 (described later) included in the compression element 130, and is stored at the bottom of the sealed container 101 as shown in FIG.

  In addition, the kind of refrigerant gas is not specifically limited, Gas well-known in the field | area of a refrigerating cycle is used suitably. In the present embodiment, for example, R600a that is a hydrocarbon-based refrigerant gas is preferably used. R600a has a relatively low global warming potential and is one of refrigerant gases that are preferably used from the viewpoint of protecting the global environment. Further, the type of the lubricating oil 103 is not specifically limited, and those known in the field of the compressor can be suitably used.

  As shown in FIG. 1, the electric element 120 includes at least a stator 121 and a rotor 122. The stator 121 is fixed below a cylinder block 131 (described later) included in the compression element 130 by a fastener such as a bolt (not shown), and the rotor 122 is disposed coaxially with the stator 121 inside the stator 121. . The rotor 122 fixes a main shaft 142 of a crankshaft 140 (described later) included in the compression element 130 by, for example, shrink fitting. The electric element 120 is connected to an external inverter drive circuit (not shown) and is inverter-driven at a plurality of operating frequencies.

  The compression element 130 is driven by the electric element 120 and compresses the refrigerant gas. As shown in FIG. 1, the compression element 130 includes a cylinder block 131, a piston 132, a cylinder 133, a compression chamber 134, a bearing portion 135, a connecting portion 136, a crankshaft 140, a valve plate 151, a cylinder head 152, a suction valve 153, An inhalation muffler 160 and the like are provided.

  The cylinder block 131 is provided with a cylinder 133 and a bearing portion 135. When the hermetic compressor 100 is placed on a horizontal plane, the cylinder 133 is disposed along the lateral direction in the hermetic container 101 when the vertical direction is the vertical direction and the horizontal direction is the horizontal direction. , And is fixed to the bearing portion 135. A substantially cylindrical bore having substantially the same diameter as the piston 132 is formed inside the cylinder 133, and the piston 132 is inserted into the cylinder 133 so as to be slidable back and forth. A compression chamber 134 is formed by the cylinder 133 and the piston 132, and the refrigerant gas is compressed therein. The bearing portion 135 rotatably supports the main shaft 142 of the crankshaft 140.

  The crankshaft 140 is supported in the sealed container 101 so that its axis is in the vertical direction, and includes a main shaft 142, an eccentric shaft 141, an oil supply mechanism 143, and the like. As described above, the main shaft 142 is fixed to the rotor 122 of the electric element 120, and the eccentric shaft 141 is formed eccentric to the main shaft 142. The oil supply mechanism 143 is provided so as to communicate from the lower end of the main shaft 142 immersed in the lubricating oil 103 to the upper end of the eccentric shaft 141, and includes an oil supply pump and a spiral groove formed on the surface of the main shaft 142. ing. The lubricating oil 103 is supplied to the crankshaft 140 by the oil supply mechanism 143.

  The piston 132 inserted into the cylinder 133 is connected to the connecting portion 136. The axis of the piston 132 is provided so as to intersect with the axial direction of the crankshaft 140. In the present embodiment, as shown in FIG. 2, the crankshaft 140 is provided such that the axis is in the vertical direction, but the piston 132 is provided so that the axis is in the lateral direction. . Therefore, the axial direction of the piston 132 is a direction orthogonal to the axial direction of the crankshaft 140. The connecting portion 136 is connected to the eccentric shaft 141 of the piston 132 and the crankshaft 140. The connecting portion 136 transmits the rotational motion of the crankshaft 140 rotated by the electric element 120 to the piston 132, and causes the piston 132 to reciprocate within the cylinder 133.

  As described above, the piston 132 is inserted into one end (crankshaft 140 side) of the cylinder 133, but the other end (opposite side of the crankshaft 140) is formed by the valve plate 151 and the cylinder head 152. It is sealed. The cylinder head 152 is fixed to the cylinder 133 together with the valve plate 151 by a fastener such as a head bolt. The valve plate 151 is located between the cylinder 133 and the cylinder head 152, and as shown in FIG. 2, a suction hole 151a and a discharge hole 151b are provided.

  The cylinder head 152 can be divided into an upper head portion 152-1 and a lower head portion 152-2 with reference to a horizontal broken line C shown in FIGS. The broken line C is based on the upper end of the gas inflow space 152b in the sealed container described later. The head upper portion 152-1 has a casing shape that forms a discharge space 152 a inside, and the upper end (communication tube outlet portion 162 a) of the communication pipe 162 of the suction muffler 160 can be arranged in the head lower part 152-2. A concave portion 152d is formed. In FIG. 2, for convenience, the concave portion 152d is shown surrounded by a broken-line frame, and in FIGS. 3 and 4, it is indicated by an arrow.

  For convenience, the surface of the cylinder head 152 that contacts the valve plate 151 (the surface on the side of the compression chamber 134 and the cylinder 133) is referred to as “contact surface 152p”, and the opposite surface is referred to as “non-contact surface 152q”. As shown in FIG. 3, the discharge space 152a of the cylinder head 152 is opened by the contact surface 152p and sealed by the non-contact surface 152q. Also, as shown in FIG. 4, the contact surface 152p is a flat surface located around the open surface of the discharge space 152a, and as shown in FIG. 2, by contacting the valve plate 151, The discharge space 152a is sealed.

  The contact surface 152p is a flat surface as described above, but the non-contact surface 152q is also present in the head lower portion 152-2. The upper part of the non-contact surface 152q is a curved surface 152q-1 that protrudes downward from the upper side in FIG. 3, and the lower part of the non-contact surface 152q extends downward from the discharge space 152a. ) Having a substantially flat first flat surface 152q-2 and a substantially flat second flat surface 152q-3 located inside the first surface. That is, the non-contact surface 152q includes a curved surface 152q-1, a first flat surface 152q-2, and a second flat surface 152q-3, as shown in FIG.

  The inner surface of the concave portion 152d of the head lower portion 152-2 is a curved surface corresponding to the shape of the communication tube outlet portion 162a, in other words, the surface facing the outer surface of the communication tube outlet portion 162a. Referred to as surface 152r ". As shown in FIGS. 2 and 4, a sealed container gas inflow space 152 b described later is formed between the communication pipe outlet 162 a and the facing surface 152 r. As shown in FIGS. 2 and 4, a heat insulating space 162 c described later is formed between the valve plate 151 and the communication pipe outlet 162 a. Further, as shown in FIGS. 2, 3 and 4, the head lower portion 152-2 is communicated from the non-contact surface 152q side toward the gas inflow space 152b (concave portion 152d) in the sealed container. A notch 152c described later is formed.

  The suction hole 151 a communicates the communication pipe 162 (communication pipe outlet 162 a) of the suction muffler 160 and the compression chamber 134. A suction valve 153 that opens and closes the suction hole 151a is provided on the surface of the valve plate 151 on the compression chamber 134 side. The suction hole 151a is configured to be openable and closable by the suction valve 153. The refrigerant gas is sucked into the compression chamber 134 from the suction muffler 160 through the suction hole 151a when the suction valve 153 is opened.

  The discharge hole 151b communicates the cylinder head 152 and the compression chamber 134, and is opened and closed by a discharge valve (not shown). A discharge space 152a is formed inside the cylinder head 152, and the refrigerant gas from the compression chamber 134 is discharged from the discharge hole 151b to the discharge space 152a. Since the discharge pipe 154 is connected to the cylinder head 152 and the discharge pipe 154 is connected to the discharge pipe 105, the discharge space 152 a is in communication with the discharge pipe 105 via the discharge pipe 154.

  The suction muffler 160 is positioned below the sealed container 101 when viewed from the cylinder 133 and the cylinder head 152. The suction muffler 160 is made of a composite material in which a reinforcing fiber such as glass fiber is added to a resin such as polybutylene terephthalate (PBT), and includes a tail pipe 161, a communication pipe 162, a muffler body 163, and the like. The inhalation muffler 160 is not limited to a composite material containing PBT, and may be any one that is molded using at least a resin.

  The muffler space 163 a of the suction muffler 160 is formed by the muffler body 163. The tail tube 161 communicates with the internal space of the sealed container 101 and guides the refrigerant gas into the muffler body 163. The communication pipe 162 is located at the upper part of the muffler main body 163 and communicates with the compression chamber 134 via the suction hole 151 a of the valve plate 151, and guides the refrigerant gas in the muffler main body 163 into the compression chamber 134.

  The communication pipe 162 of the suction muffler 160 extends upward toward the other end (opposite side of the crankshaft 140) of the cylinder 133 at a position between the valve plate 151 and the cylinder head 152. As shown in FIGS. 2 and 3, a communication pipe outlet 162a is provided.

  As described above, the concave portion 152d is provided on the compression chamber 134 side of the cylinder head 152, and the communication pipe outlet portion 162a is spaced from the opposing surface 152r (the inner surface of the concave portion 152d) by a predetermined interval (gas in the sealed container). It is inserted into the recess 152d so as to form an inflow space 152b). For example, an elastic member (not shown) is disposed inside the recess 152d, and the communication pipe outlet 162a is pressed against the valve plate 151 by the elastic member, so that it is fixed in a state of being sandwiched between the valve plate 151 and the concave portion 152d. Yes.

  An opening 162b is provided at the tip of the communication pipe outlet 162a, and the opening 162b communicates with the suction hole 151a of the valve plate 151. Although the communication state between the opening 162b and the suction hole 151a is not particularly limited, in the present embodiment, as shown in FIG. 2, the opening 162b has a shape protruding from the communication pipe outlet 162a. The opening 162b is inserted into the suction hole 151a. Therefore, the opening 162b is not in contact with the surface on the cylinder head 152 side of the valve plate 151, but is inserted into the suction hole 151a and exposed on the surface on the cylinder 133 side.

  Thus, if the opening 162b of the communication pipe outlet 162a and the suction hole 151a communicate with each other, the communication pipe 162 and the compression chamber 134 communicate with each other through the suction hole 151a (and the suction valve 153). It will be. Therefore, the suction muffler 160 communicates with the compression chamber 134 in the cylinder 133 via the communication pipe 162, and the upper end (communication pipe outlet portion 162a) of the communication pipe 162 is urged into the recess 152d of the cylinder head 152. As a result, the valve plate 151 is fixed.

[Operation of hermetic compressor]
Next, the operation of the hermetic compressor 100 having the above-described configuration will be specifically described together with its operation. Although not shown in FIGS. 1 to 4, the hermetic compressor 100 is configured such that a suction pipe 104 and a discharge pipe 105 are connected to a refrigeration apparatus having a known configuration to constitute a refrigeration cycle. To do.

  First, when the electric element 120 is energized by an external power source, a current flows through the stator 121 to generate a magnetic field, and the rotor 122 rotates. The main shaft 142 of the crankshaft 140 is rotated by the rotation of the rotor 122, and the rotation of the main shaft 142 is transmitted to the piston 132 via the eccentric shaft 141 and the connecting portion 136, and the piston 132 reciprocates in the cylinder 133. Along with this, refrigerant gas is sucked, compressed, and discharged in the compression chamber 134.

  Specifically, of the directions in which the piston 132 moves in the cylinder 133, the direction in which the volume of the compression chamber 134 increases is referred to as “increase direction” for convenience, and the direction in which the volume of the compression chamber 134 decreases is referred to as “ If referred to as a “decreasing direction”, when the piston 132 moves in the increasing direction, the refrigerant gas in the compression chamber 134 expands. When the pressure in the compression chamber 134 falls below the suction pressure, the suction valve 153 starts to open due to the difference between the pressure in the compression chamber 134 and the pressure in the suction muffler 160.

  With this operation, the low-temperature refrigerant gas returned from the refrigeration apparatus is once released from the suction pipe 104 to the internal space of the sealed container 101. Thereafter, the refrigerant gas is introduced from a suction port (not shown) of the suction muffler 160 into the muffler space 163a in the muffler main body 163 via the tail pipe 161. At this time, since the suction valve 153 starts to open as described above, the introduced refrigerant gas flows into the compression chamber 134 via the communication pipe 162 and the suction hole 151a. Thereafter, when the piston 132 starts to move in a decreasing direction from the bottom dead center in the cylinder 133, the refrigerant gas in the compression chamber 134 is compressed, and the pressure in the compression chamber 134 increases. Further, the suction valve 153 is closed due to the difference between the pressure in the compression chamber 134 and the pressure in the suction muffler 160.

  Next, when the pressure in the compression chamber 134 exceeds the pressure in the discharge space 152a, a discharge valve (not shown) starts to open due to the difference between the pressure in the compression chamber 134 and the pressure in the discharge space 152a.

  With this operation, the compressed refrigerant gas is discharged from the discharge hole 151b to the discharge space 152a until the piston 132 reaches the top dead center in the cylinder 133. The refrigerant gas discharged into the discharge space 152a is sent to the refrigeration apparatus via the discharge pipe 154 and the discharge pipe 105.

  Thereafter, when the piston 132 starts to move again in the increasing direction from the top dead center in the cylinder 133, the refrigerant gas in the compression chamber 134 expands, so that the pressure in the compression chamber 134 decreases. When the pressure in the compression chamber 134 is lower than the pressure in the discharge space 152a, the discharge valve is closed.

  Since such suction, compression, and discharge strokes are repeated for each rotation of the crankshaft 140, the refrigerant gas circulates in the refrigeration cycle.

[Configuration of cylinder head and communication pipe outlet]
Next, in the present invention, the gas inflow space 152b in the sealed container formed by the cylinder head 152 and the communication pipe outlet 162a will be specifically described with reference to FIGS.

  As shown in FIGS. 2 and 4, in the recess 152d of the cylinder head 152, a gas flow space 152b in the sealed container is formed between the facing surface 152r (see FIG. 3) and the communication pipe outlet 162a. . The gas inflow space 152b in the sealed container includes a first gap 152b-1 that is a horizontal gap and a second gap 152b-2 that is a vertical gap.

  The first gap 152b-1 is formed between the lower surface in the concave portion 152d of the cylinder head 152 and the upper peripheral surface of the communication pipe outlet 162a. Here, the lower surface in the concave portion 152d of the cylinder head 152 corresponds to a curved surface (upper curved surface of the concave portion 152d) located on the discharge space 152a side of the opposing surface 152r of the concave portion 152d. The second gap 152b-2 is formed between the side surface in the recess 152d of the cylinder head 152 and the side peripheral surface of the communication pipe outlet 162a. Here, the side surface in the concave portion 152d of the cylinder head 152 corresponds to an inner peripheral curved surface excluding the upper curved surface in the facing surface 152r of the concave portion 152d. The first gap 152b-1 and the second gap 152b-2 constitute one continuous gap provided around the communication pipe outlet 162a, that is, a gas inflow space 152b in the sealed container. It communicates with the enclosed space inside.

  Since the first gap 152b-1 is a lateral gap in the gas inflow space 152b in the sealed container, the gap extending along the axial direction of the piston 132 so as to face the upper peripheral surface of the communication pipe outlet 162a. Positioned as (space). Further, since the second gap 152b-2 is a vertical gap in the gas inflow space 152b in the sealed container, the second gap 152b-2 extends in the axial direction of the crankshaft 140 so as to face the side peripheral surface of the communication pipe outlet 162a. It is positioned as a gap (space). As shown in FIG. 2, the gas inflow space 152b in the sealed container is formed such that the thickness W1 of the first gap 152b-1 is larger than the thickness W2 of the second gap 152b-2.

  Here, the thickness W1 of the first gap 152b-1 is the average of the lengths of the perpendiculars when a plurality of perpendiculars are drawn from the upper curved surface of the recess 152d to the upper peripheral surface of the communication pipe outlet 162a. Set as a value. Further, the thickness W2 of the second gap 152b-2 is defined as the perpendicular lines drawn when a plurality of vertical lines are drawn from the inner peripheral curved surface of the recess 152d to the side peripheral surface of the communication pipe outlet 162a. Set as an average value.

  Further, in the present embodiment, as shown in FIGS. 2, 3, and 4, a notch portion 152 c is provided in the head lower portion 152-2 of the cylinder head 152. The position of the notch 152c is a position where the opening 162b of the communication pipe outlet 162a is projected onto the head lower portion 152-2, as indicated by a dotted line in FIG. As shown in FIG. 2, the opening 162b is disposed so as to communicate with the suction hole 151a of the valve plate 151. Therefore, the notch 152c is located at a position where the suction hole 151a is projected at the lower head portion 152-2. Is provided.

  As shown in FIGS. 2 and 3, the notch 152c is provided along the axial direction of the piston 132 in the head lower portion 152-2, so that the second gap 152b- 2 is formed. Moreover, as shown in FIG. 4, it is preferable that the opening of the notch 152c has a shape that includes the opening 162b of the communication pipe outlet 162a. Therefore, it is preferable that the size of the opening of the notch 152c is larger than the area of the opening 162b and the suction hole 151a corresponding thereto. In FIG. 4, the opening of the notch 152 c has a horizontal rectangular shape, but is not limited thereto.

  In addition, in the present embodiment, as shown in FIGS. 2 and 4, the outer periphery directly below the opening 162 b in the communication pipe outlet 162 a (the outer periphery facing the valve plate 151 in the communication pipe outlet 162 a) The heat insulation space 162c is provided. Since the heat insulating space 162c is provided as a concave portion on the outer periphery of the communication pipe outlet portion 162a, for example, when molding the suction muffler 160, a concave portion may be integrally formed at a corresponding portion of the communication pipe 162. The recess may be processed after the suction muffler 160 is molded. Preferably, the recess may be integrally formed when the suction muffler 160 is molded.

  The inside of the heat insulating space 162c and the inside of the communication pipe 162 are communicated with each other through a communication hole 162d. That is, the heat insulation space 162c and the communication hole 162d penetrating the communication pipe 162 are formed on the outer periphery directly below the opening 162b in the communication pipe outlet 162a. As shown in FIGS. 2 and 4, the heat insulating space 162 c is configured as a concave portion that opens toward the valve plate 151, but the communication pipe outlet 162 a abuts the valve plate 151, so that the surrounding sealed space and It becomes the closed space isolated from the gas inflow space 152b in the sealed container. The refrigerant gas in the communication pipe 162 is introduced into the heat insulation space 162c through the communication hole 162d, but the refrigerant gas does not leak from the heat insulation space 162c.

  The action and effect of suppressing the increase in the temperature of the suction gas and effectively suppressing the decrease in volumetric efficiency due to the gas inflow space 152b in the sealed container will be specifically described.

  The cylinder head 152 and the valve plate 151 in close contact with the cylinder head 152 are heated to a high temperature by the high-temperature refrigerant gas in the discharge space 152a. Furthermore, the valve plate 151 is also heated by the compressed refrigerant gas in the compression chamber 134 and becomes high temperature. In the case of a hermetic compressor having a general configuration, the refrigerant gas sucked into the suction muffler 160 is heated by the valve plate 151 when passing through the suction hole 151a of the valve plate 151 from the communication pipe outlet 162a. Increase in volume. Therefore, in the case of a conventional hermetic compressor, the volume efficiency is lowered.

  On the other hand, if the gas inlet space 152b in the sealed container is provided between the communication pipe outlet 162a and the cylinder head 152 as in the present embodiment, the gas inlet space 152b in the sealed container is insulated. Thus, heat transfer from the high-temperature cylinder head 152 to the communication pipe outlet 162a can be suppressed. Therefore, when the refrigerant gas is drawn into the compression chamber 134, the heating of the refrigerant gas is effectively suppressed, so that the volumetric efficiency of the hermetic compressor 100 can be improved.

  Further, when the space temperature is compared, the temperature of the discharge space 152a in the cylinder head 152 is the highest, and then the temperature of the internal space of the sealed container 101 is higher than the internal temperature of the communication pipe 162 of the suction muffler 160. Therefore, from the viewpoint of suppressing heat transfer to the refrigerant gas flowing in the communication pipe 162 (particularly, in the communication pipe outlet 162a), the sealed container gas inflow space 152b is formed in the axial direction (lateral direction) of the piston 132. The thickness W1 of the first gap 152b-1 is set to be larger than the thickness W2 of the second gap 152b-2 along the axial direction (vertical direction) of the crankshaft 140. That is, if the thickness W1 of the first gap 152b-1 located below the discharge space 152a is larger than the thickness W2 of the second gap 152b-2, the discharge space 152a having a particularly large amount of heat is connected to the communication pipe outlet 162a. Heat transfer can be effectively suppressed.

  In the present embodiment, as shown in FIG. 2, since the opening 162b at the tip of the communication pipe outlet 162a protrudes, it is inserted into the suction hole 151a. Therefore, it is possible to avoid that the low-temperature refrigerant gas directly contacts the high-temperature valve plate 151 when the refrigerant gas flowing through the communication pipe 162 is sucked into the compression chamber 134.

  According to the present embodiment, heat is transferred from the lower head portion 152-2 of the cylinder head 152 to the refrigerant gas by the second gap 152b-2 of the gas inflow space 152b in the sealed container inside the communication pipe outlet portion 162a. Thus, heat transfer from the discharge space 152a in the head upper portion 152-1 to the refrigerant gas is suppressed by the first gap 152b-1. Therefore, the temperature rise of the refrigerant gas sucked into the compression chamber 134 from the opening 162b through the suction hole 151a is effectively suppressed. Moreover, as described above, when the opening 162b is inserted into the suction hole 151a, the opening 162b functions as a heat insulating layer. Therefore, since it is possible to suppress heat transfer from the high-temperature valve plate 151 to the refrigerant gas in which the temperature rise is suppressed, the low-temperature refrigerant gas in which the temperature rise is suppressed is contained in the compression chamber 134. Can be inhaled.

  The head lower portion 152-2 of the cylinder head 152 is provided with a notch 152c having a size including the opening area of the suction hole 151a on the horizontal projection surface of the suction hole 151a. As a result, the high-temperature cylinder head 152 (head lower portion 152-2) does not partially exist in the lateral direction when viewed from the opening 162b of the communication tube outlet portion 162a. Further, a second gap 152b-2 of the gas inflow space 152b in the sealed container is formed between the communication pipe outlet part 162a and the head lower part 152-2, and between the communication pipe outlet part 162a and the head upper part 152-1. Is formed with a first gap 152b-1 of the gas inflow space 152b in the sealed container. Therefore, the area where the cylinder head 152 and the communication pipe outlet 162a overlap with each other with the gas inflow space 152b in the sealed container interposed therebetween can be reduced. Therefore, heat transfer from the high-temperature cylinder head 152 to the communication pipe outlet 162a can be more effectively suppressed, and the temperature rise of the refrigerant gas can be further suppressed.

  Moreover, the communication pipe outlet 162a is provided with a heat insulating space 162c that is isolated from the sealed space on the outer periphery directly below the opening 162b. As described above, the heat insulating space 162c is integrally formed when the suction muffler 160 is molded, and refrigerant gas is introduced into the heat insulating space 162c through the communication hole 162d. Therefore, the heat insulation space 162c can be kept at a low temperature close to the temperature of the refrigerant gas by the low-temperature refrigerant gas introduced therein. Thereby, between the outer periphery by the side of the valve plate 151 of the communicating pipe exit part 162a and the valve plate 151 can be thermally insulated. Therefore, the communication pipe outlet 162a is insulated from the cylinder head 152 by the gas inflow space 152b in the sealed container and insulated by the heat insulation space 162c. Therefore, the temperature rise of the refrigerant gas flowing in the communication pipe outlet 162a can be further suppressed.

  Thus, in the present embodiment, heat transfer from the cylinder head 152 to the communication pipe outlet 162a can be suppressed by forming at least the gas flow space 152b in the sealed container. Moreover, by providing the notch portion 152c in the head lower portion 152-2 of the cylinder head 152, heat transfer to the communication tube outlet portion 162a can be further suppressed. Furthermore, if the opening 162b of the communication pipe outlet 162a is inserted into the suction hole 151a, heat transfer from the valve plate 151 to the refrigerant gas in the opening 162b can be suppressed, and the communication pipe outlet 162a If the heat insulation space 162c is provided directly under the opening 162b, heat transfer from the valve plate 151 to the communication pipe outlet 162a can be further suppressed. Therefore, according to the present embodiment, the temperature rise of the sucked refrigerant gas flowing through the communication pipe 162 can be effectively suppressed, so that the volumetric efficiency can be improved, and the hermetic compressor The efficiency of 100 can be improved.

[Modification]
In the present embodiment, the operating frequency of the hermetic compressor 100 is not particularly limited, but the hermetic compressor 100 may be configured to be inverter-driven at a plurality of operating frequencies. In the present embodiment, as described above, by providing at least the gas flow space 152b in the sealed container, heat transfer from the high-temperature cylinder head 152 and the valve plate 151 to the refrigerant gas flowing in the communication pipe outlet 162a is performed. It is suppressed. Thereby, even when the speed of the refrigerant gas passing through the communication pipe 162 is relatively slow, heat transfer from the cylinder head 152 and the valve plate 151 to the refrigerant gas is effectively suppressed. Therefore, the hermetic compressor 100 can be driven by an inverter so as to rotate at a low speed.

  Further, in the present embodiment, the gas inflow space 152b in the sealed container extends in the lateral direction (the axial direction of the piston 132) and has a first gap 152b-1 having a curved cross section, and the longitudinal direction (the axis of the crankshaft 140). Direction) and a second gap 152b-2 having a curved cross section. However, the configuration of the gas flow space 152b in the sealed container is not limited to this, and includes a gap other than the first gap 152b-1 and the second gap 152b-2 depending on the specific configuration of the hermetic compressor 100. It may be a configuration.

  That is, the first gap 152b-1 of the gas inflow space 152b in the sealed container insulates the upper peripheral surface of the communication pipe outlet 162a, and the second gap 152b-2 is a valve plate in the communication pipe outlet 162a. The side peripheral surface other than the position facing 151 is insulated, but depending on the configuration of the hermetic compressor 100, the other peripheral surface of the communication pipe outlet 162a is insulated or other than the communication pipe outlet 162a. A gap that insulates the peripheral surface of the communication pipe 162 may be included.

  Further, in the present embodiment, the notch 152c is provided in the head lower portion 152-2 of the cylinder head 152. However, as shown in FIG. 5, the notch 152c is provided in the head lower portion 152-2. It does not have to be. In this case, the thickness W2 of the second gap 152b-2 may be set larger than the configuration provided with the notch portion 152c (configuration shown in FIG. 2). Therefore, in the sealed container gas inflow space 152b, it is preferable that the thickness W1 of the first gap 152b-1 located on the higher temperature discharge space 152a side is larger than the thickness W2 of the second gap 152b-2. Depending on the specific configuration of the hermetic compressor 100, the thickness W1 of the first gap 152b-1 and the thickness W2 of the second gap 152b-2 may be equal, or the thickness of the second gap 152b-2. W2 may be larger.

  In addition, a known spacer may be provided between the communication tube outlet portion 162a and the concave portion 152d of the cylinder head 152 in order to suitably maintain the thicknesses W1 and W2 of the gas inflow space 152b in the sealed container. This spacer has only a low thermal conductivity and is rigid enough to maintain the shape between the facing surface 152r of the recess 152d and the outer peripheral surface of the communication pipe outlet 162a.

(Embodiment 2)
In the second embodiment, an example of a refrigeration apparatus including the hermetic compressor 100 described in the first embodiment will be specifically described with reference to FIG.

  The hermetic compressor 100 according to the present invention can be widely and suitably used in a refrigeration cycle or various devices (refrigeration apparatuses) having a configuration substantially equivalent to the refrigeration cycle. Specifically, for example, refrigerators (household refrigerators, commercial refrigerators), ice machines, showcases, dehumidifiers, heat pump water heaters, heat pump wash dryers, vending machines, air conditioners, air compressors, etc. Although it can mention, it does not specifically limit. In the present embodiment, as an application example of the hermetic compressor 100 according to the present invention, the basic structure of the refrigeration apparatus 200 will be described by taking the article storage apparatus shown in FIG.

  A refrigeration apparatus 200 shown in FIG. 6 includes a refrigeration apparatus main body 201 and a refrigerant circuit 205. The refrigeration apparatus main body 201 is composed of a heat-insulating box having an open surface and a door that opens and closes the opening of the box. The interior of the refrigeration apparatus main body 201 includes a storage space 202 that stores articles, a machine room 203 that houses a refrigerant circuit 205 and the like, and a partition wall 204 that partitions the storage space 202 and the machine room 203.

  The refrigerant circuit 205 has a configuration in which the hermetic compressor 100, the radiator 206, the decompressor 207, and the heat absorber 208 described in Embodiment 1 are connected in a ring shape by a pipe 209. That is, the refrigerant circuit 205 is an example of a refrigeration cycle using the hermetic compressor 100 according to the present invention.

  Of the refrigerant circuit 205, the hermetic compressor 100, the radiator 206, and the pressure reducing device 207 are disposed in the machine chamber 203, and the heat absorber 208 is disposed in a storage space 202 including a blower not shown in FIG. Yes. The cooling heat of the heat absorber 208 is agitated so as to circulate in the storage space 202 by a blower, as indicated by a broken arrow.

  Thus, the refrigeration apparatus 200 according to the present embodiment is mounted with the hermetic compressor 100 according to the first embodiment. Since the hermetic compressor 100 is configured to have the gas flow space 152b in the hermetic container as described above, the volumetric efficiency can be effectively suppressed from decreasing by suppressing the temperature rise of the refrigerant gas. It has become a high thing. By operating the refrigerant circuit 205 with such a highly efficient hermetic compressor 100, the power consumption of the refrigeration apparatus 200 can be reduced, and energy saving can be realized.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  Since the present invention can improve the efficiency of a hermetic compressor, it can be used widely and suitably in the field of hermetic compressors. For example, a household refrigeration apparatus such as an electric refrigerator-freezer and an air conditioner, or It can be used widely and suitably in the field of refrigeration equipment using a hermetic compressor, such as commercial refrigeration equipment such as commercial showcases and vending machines.

100 Sealed Compressor 101 Sealed Container 104 Suction Pipe 105 Discharge Pipe 120 Electric Element 130 Compression Element 131 Cylinder Block 132 Piston 133 Cylinder 134 Compression Chamber 136 Connecting Portion 140 Crankshaft 141 Eccentric Shaft 142 Main Shaft 151 Valve Plate 151a Suction Hole 151b Discharge Hole 152 Cylinder head 152-1 Head upper portion 152-2 Head lower portion 152a Discharge space 152b Gas inflow space 152c in sealed container Notch portion 152d Recess 153 Suction valve 154 Discharge pipe 160 Suction muffler 161 Tail pipe 162 Communication pipe 162a Communication pipe outlet 162b Opening 162c Heat insulation space 163 Muffler body 163a Silencer space 200 Refrigeration device 205 Refrigerant circuit 206 Radiator 207 Decompression device 208 Heat absorber

Claims (9)

A sealed container having a sealed space inside,
An electric element housed in the sealed container;
A compression element housed in the sealed container and driven by the electric element to compress refrigerant gas,
The compression element is
A crankshaft that is supported so that its axis is in the vertical direction and is rotationally driven by the electric element;
A piston that is provided so that its axis intersects the axial direction of the crankshaft, and reciprocates by rotation of the crankshaft;
A cylinder in which a compression chamber is formed, and the piston is inserted so as to be reciprocally movable from one end thereof;
A valve plate that seals the other end of the cylinder and has a suction hole and a discharge hole;
A cylinder head fixed to the other end of the cylinder via the valve plate and having a discharge space communicating with the discharge hole inside;
A suction muffler that is located below the cylinder, has a sound deadening space inside, and includes a communication pipe connected to the suction hole;
With
Wherein the communicating pipe is communicating tube outlet portion extending upward is provided from the suction muffler toward the other end of the cylinder, the upper end of the communicating tube outlet has an opening communicating with the suction hole is provided And
On the compression chamber side of the lower part of the cylinder head, there is an inner surface that is a curved surface corresponding to the shape of the communication pipe outlet part, and a recess is provided that allows the communication pipe outlet part to be inserted .
An airtight container that is a gap communicating with the sealed space between the communication pipe outlet and the inner surface of the recess, and is a heat insulating layer that suppresses heat transfer from the cylinder head to the communication pipe outlet. Inner gas inflow space is provided,
Hermetic compressor. When the axial direction of the crankshaft is the vertical direction and the axial direction of the piston is the horizontal direction,
The gas inflow space in the sealed container is located below the discharge space and extends in the lateral direction so as to face the upper peripheral surface of the communication pipe outlet part, and the communication pipe outlet part A second gap extending in the longitudinal direction so as to face the side peripheral surface of
The hermetic compressor according to claim 1. The thickness of the first gap in the gas inflow space in the sealed container is larger than the thickness of the second gap,
The hermetic compressor according to claim 2. An opening provided at a tip of the communication pipe outlet is inserted into the suction hole.
The hermetic compressor according to claim 1. In the cylinder head, a notch portion is formed at a position that becomes a projection surface obtained by projecting the suction hole in a lateral direction in a lower portion of the cylinder head.
The hermetic compressor according to claim 1. The communication pipe outlet portion is provided with a heat insulating space isolated from the sealed space on the outer periphery facing the valve plate,
A communication hole that communicates the heat insulation space and the inside of the communication pipe outlet is provided,
The hermetic compressor according to claim 1. The inhalation muffler is molded using resin,
The heat insulating space is integrally formed when the suction muffler is molded.
The hermetic compressor according to claim 6. Inverter driven at multiple operating frequencies,
The hermetic compressor according to any one of claims 1 to 7. It has a refrigerant circuit which connected the hermetic compressor according to any one of claims 1 to 8, a radiator, a decompression device, and a heat absorber cyclically by piping.
Refrigeration equipment.

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