JP5906632B2 - Rotary compressor - Google Patents

Description

  The present invention relates to a rotary compressor used in a refrigeration cycle of an air conditioner.

  In the rotary compressor, the compressor and the motor are cooled by the refrigerant flowing in the compressor housing, but the refrigeration cycle is closed due to forgetting to open a valve such as a three-way valve arranged in the refrigeration cycle or malfunction of the expansion valve. When the rotary compressor is operated in this state, the refrigerant gas cannot be sucked into the compression unit. If the operation of the rotary compressor is continued in this state, the sliding portion of the compression portion becomes high temperature and abnormal wear occurs. In addition, the insulating material of the motor melts, resulting in poor insulation.

  Conventionally, in a rotary compressor, a temperature sensor is disposed in an upper shell or a discharge pipe of a compressor housing, and a high temperature abnormality is detected to stop the operation. However, in the rotary compressor, the high temperature compression section is disposed at the lower part of the compressor casing, and since the refrigerant does not flow as described above, it is slow to transfer heat to the upper shell and the discharge pipe. There is a problem that the temperature sensor detects a high temperature abnormality and delays in stopping the operation, causing the above-mentioned problem.

  In addition, there is a method of arranging another temperature sensor in the vicinity of the compression unit at the lower part of the compressor housing in order to detect a high temperature abnormality at an early stage. There is a problem that the control becomes complicated.

  Further, conventionally, a bypass channel formed in a fixed scroll and communicating the high pressure chamber and the low pressure chamber, a valve assembly disposed on the bypass channel and opening / closing the bypass channel, and a temperature of the high pressure chamber Is increased to a set value or more, a heat deformation member that operates the valve assembly in a direction to open the bypass flow path and bypasses the high-temperature and high-pressure gas in the high-pressure chamber to the low-pressure chamber. An overheat prevention device is disclosed (for example, see Patent Document 1).

  The valve assembly is formed on the fixed scroll and is connected to the bypass flow path. The valve assembly is linearly movable in the valve housing and opens and closes the bypass flow path. A spring that is disposed on one side of the body and imparts an elastic force to the valve body. The thermal deformation member is built in a mounting groove formed on an upper surface of the fixed scroll, and the mounting groove is connected to a flow path opened and closed by the thermal deformation member, and the flow path is a valve of the valve assembly. Communicates with the housing.

JP 2005-180448 A

  However, according to the above-described conventional overheat prevention device for a scroll compressor, the bypass scroll for connecting the high pressure chamber and the low pressure chamber to the fixed scroll, the valve housing, the mounting groove for the heat deformation member, and the mounting groove and the valve housing are communicated. The flow path is formed, and as the member, a heat deformation member, a valve body, and a spring are used. For this reason, there are problems that the number of processing steps for the fixed scroll is large and the number of members is large, resulting in an increase in cost.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining a low-cost rotary compressor provided with an overheat prevention apparatus.

In order to solve the above-described problems and achieve the object, the present invention includes a sealed vertical compressor housing in which oil is stored in a lower portion, and a first offset disposed on the upper portion of the compressor housing. A motor for driving a rotary shaft having a core part and a second eccentric part, and an annular first part disposed at the lower part of the compressor housing and provided with first suction holes and first vane grooves radially on the side part. One cylinder, a first annular piston that revolves in the first cylinder along the inner wall of the first cylinder and fits in the first eccentric portion of the rotary shaft, and the first vane groove from the first vane groove. A first vane that protrudes into the cylinder and abuts against the first annular piston, and that discharges compressed refrigerant gas into the compressor housing, and an upper portion of the first compression unit. In which an annular second suction hole and a second vane groove are provided radially on the side. A cylinder, a second annular piston that revolves in the second cylinder along the inner wall of the second cylinder and fits in the second eccentric portion of the rotating shaft, and the second cylinder from within the second vane groove A second vane that protrudes into the second annular piston and abuts against the second annular piston, and discharges compressed refrigerant gas into the compressor casing; and a side portion of the compressor casing. The attached accumulator, a first low-pressure connecting pipe having one end connected to the first suction hole and the other end inserted into the accumulator, and one end connected to the second suction hole and the other end inserted into the accumulator In the rotary compressor comprising the second low-pressure connecting pipe, a mounting hole penetrating from the upper surface of the second cylinder to the second suction hole, a through hole at the center, and the mounting hole at one end. Fixed part is formed The other end portion of the communication member is a valve seat portion, and the through hole of the valve seat portion of the communication member is normally closed. A heat deformation valve member that returns the refrigerant gas in the compressor housing to the second suction hole, and the heat deformation member is held in a cap that covers the other end of the communication member, and the cap inner is it the oil reservoir, the cap is provided with through holes for passing the refrigerant gas, to the through holes, that you have strainer is attached to prevent foreign material from entering the cap Features.

  According to the present invention, the mounting hole communicating with the second suction hole is provided on the upper surface of the second cylinder, and the on-off valve including the communication member and the heat deformation valve member is simply mounted at the mounting hole. There exists an effect that overheating of a compression part can be prevented.

FIG. 1 is a longitudinal sectional view showing a rotary compressor to which the present invention is applied. FIG. 2 is a cross-sectional view of the first and second compression units. FIG. 3 is a partially enlarged longitudinal sectional view showing a compression portion of an embodiment of the rotary compressor according to the present invention. FIG. 4 is a longitudinal sectional view showing a closed state of the on-off valve of the embodiment. FIG. 5 is a longitudinal sectional view showing an open state of the on-off valve of the embodiment. FIG. 6 is a top view of the heat deformation valve member of the on-off valve of the embodiment.

  Embodiments of a rotary compressor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a longitudinal sectional view showing a rotary compressor to which the present invention is applied, and FIG. 2 is a transverse sectional view of first and second compression sections.

  As shown in FIG. 1, the rotary compressor 1 includes a compression unit 12 disposed at a lower portion of a hermetically sealed cylindrical compressor housing 10 and an upper portion of the compressor housing 10. And a motor 11 that drives the compression unit 12 via 15.

  The stator 111 of the motor 11 is fixed by being shrink-fitted on the inner peripheral surface of the compressor housing 10. The rotor 112 of the motor 11 is disposed at the center of the stator 111 and is fixed by being shrink-fitted to a rotating shaft 15 that mechanically connects the motor 11 and the compression unit 12.

  The compression unit 12 includes a first compression unit 12S and a second compression unit 12T that is arranged in parallel with the first compression unit 12S and stacked on the upper side of the first compression unit 12S. As shown in FIG. 2, the first and second compression parts 12S and 12T are provided with first and second suction holes 135S and 135T, first and second vane grooves 128S and 128T radially in the radial direction. Annular first and second cylinders 121S and 121T are provided.

  As shown in FIGS. 1 and 2, circular first and second cylinder inner walls 123 </ b> S and 123 </ b> T are formed on the first and second cylinders 121 </ b> S and 121 </ b> T concentrically with the motor 11. In the first and second cylinder inner walls 123S and 123T, first and second annular pistons 125S and 125T having an outer diameter smaller than the cylinder inner diameter are arranged, respectively, and the first and second cylinder inner walls 123S and 123T, The first and second working chambers 130S and 130T (compression spaces) are formed between the first and second annular pistons 125S and 125T for sucking, compressing and discharging the refrigerant gas.

  The first and second cylinders 121S and 121T are respectively formed with first and second vane grooves 128S and 128T extending radially from the first and second cylinder inner walls 123S and 123T over the entire cylinder height. In the first and second vane grooves 128S and 128T, flat plate-like first and second vanes 127S and 127T are slidably fitted.

  As shown in FIG. 2, the first and second vane grooves 128S and 128T are communicated with the first and second vane grooves 128S and 128T from the outer periphery of the first and second cylinders 121S and 121T at the back of the first and second vane grooves 128S and 128T. First and second spring holes 124S and 124T are formed. Vane springs (not shown) that press the back surfaces of the first and second vanes 127S and 127T are inserted into the first and second spring holes 124S and 124T. When the rotary compressor 1 is started, the first and second vanes 127S and 127T are moved from the first and second vane grooves 128S and 128T to the first and second working chambers 130S and 130T by the repulsive force of the vane springs. The first and second working chambers 130S and 130T (compression space) are projected by the first and second vanes 127S and 127T. Is divided into first and second suction chambers 131S and 131T and first and second compression chambers 133S and 133T.

  In addition, the first and second cylinders 121S and 121T communicate with the inner portions of the first and second vane grooves 128S and 128T and the interior of the compressor housing 10 through the opening R shown in FIG. First and second pressure introducing passages 129S and 129T are formed in which the compressed refrigerant gas in the housing 10 is introduced and back pressure is applied to the first and second vanes 127S and 127T by the pressure of the refrigerant gas. .

  In the first and second cylinders 121S and 121T, the first and second suction chambers 131S and 131T communicate with the outside in order to suck the refrigerant from the outside into the first and second suction chambers 131S and 131T. Second suction holes 135S and 135T are provided.

  Further, as shown in FIG. 1, an intermediate partition plate 140 is disposed between the first cylinder 121S and the second cylinder 121T, and the second operation of the first working chamber 130S of the first cylinder 121S and the second cylinder 121T. The room 130T is partitioned. A lower end plate 160S is disposed at the lower end of the first cylinder 121S, and closes the first working chamber 130S of the first cylinder 121S. An upper end plate 160T is disposed at the upper end portion of the second cylinder 121T, and closes the second working chamber 130T of the second cylinder 121T.

  A lower bearing portion 161S is formed on the lower end plate 160S, and the lower bearing support portion 151 of the rotary shaft 15 is rotatably supported by the lower bearing portion 161S. An upper bearing portion 161T is formed on the upper end plate 160T, and an upper bearing support portion 153 of the rotary shaft 15 is rotatably supported by the upper bearing portion 161T.

  The rotating shaft 15 includes a first eccentric portion 152S and a second eccentric portion 152T that are offset by 180 ° from each other. The first eccentric portion 152S is a first annular portion of the first compression portion 12S. The second eccentric portion 152T is rotatably fitted to the second annular piston 125T of the second compression portion 12T.

  When the rotary shaft 15 rotates, the first and second annular pistons 125S and 125T move in the first and second cylinders 121S and 121T counterclockwise in FIG. 2 along the first and second cylinder inner walls 123S and 123T. Revolving and following this, the first and second vanes 127S and 127T reciprocate. Due to the movement of the first and second annular pistons 125S and 125T and the first and second vanes 127S and 127T, the volumes of the first and second suction chambers 131S and 131T and the first and second compression chambers 133S and 133T are continuous. The compressor 12 continuously sucks, compresses and discharges the refrigerant gas.

  As shown in FIG. 1, a lower muffler cover 170S is disposed below the lower end plate 160S, and a lower muffler chamber 180S is formed between the lower end plate 160S. And the 1st compression part 12S is opened to lower muffler room 180S. That is, a first discharge hole 190S (see FIG. 2) that connects the first compression chamber 133S of the first cylinder 121S and the lower muffler chamber 180S is provided in the vicinity of the first vane 127S of the lower end plate 160S. A first discharge valve 200S that prevents the backflow of the compressed refrigerant gas is disposed in the hole 190S.

  The lower muffler chamber 180S is one chamber formed in an annular shape, and the lower end plate 160S, the first cylinder 121S, the intermediate partition plate 140, the second cylinder 121T, and the upper end plate 160T are arranged on the discharge side of the first compression unit 12S. This is a part of the communication passage that communicates with the upper muffler chamber 180T through the refrigerant passage 136 (see FIG. 2) that passes through the upper muffler chamber. The lower muffler chamber 180S reduces the pressure pulsation of the discharged refrigerant gas. In addition, a first discharge valve presser 201S for limiting the amount of flexure opening of the first discharge valve 200S is fixed to the first discharge valve 200S together with the first discharge valve 200S by a rivet.

  As shown in FIG. 1, an upper muffler cover 170T is arranged above the upper end plate 160T, and an upper muffler chamber 180T is formed between the upper end plate 160T and the upper muffler cover 170T. In the vicinity of the second vane 127T of the upper end plate 160T, a second discharge hole 190T (see FIG. 2) that communicates the second compression chamber 133T of the second cylinder 121T and the upper muffler chamber 180T is provided, and the second discharge hole 190T. Is provided with a second discharge valve 200T that prevents the backflow of the compressed refrigerant gas.

  In addition, a second discharge valve presser 201T for limiting the deflection opening amount of the second discharge valve 200T is fixed to the second discharge valve 200T by a rivet together with the second discharge valve 200T. The upper muffler chamber 180T reduces the pressure pulsation of the discharged refrigerant.

  The first cylinder 121S, the lower end plate 160S, the lower muffler cover 170S, the second cylinder 121T, the upper end plate 160T, the upper muffler cover 170T, and the intermediate partition plate 140 are integrally fastened by bolts 175. Out of the compression portion 12 that is integrally fastened by the bolt 175, the outer peripheral portion of the upper end plate 160T is fixed to the compressor housing 10 by spot welding, and the compression portion 12 is fixed to the compressor housing 10.

  The first and second through holes 101 and 102 are passed through the outer peripheral wall of the cylindrical compressor housing 10 in order from the lower part in the axial direction so as to pass the first and second suction pipes 104 and 105. Is provided. Further, an accumulator 25 made of an independent cylindrical sealed container is attached to the outside of the compressor housing 10 by an accumulator holder 252 and an accumulator band 253.

  A system connection pipe 255 connected to the low pressure side of the refrigeration cycle is connected to the center of the top of the accumulator 25, and one end of the accumulator 25 is inserted into the bottom through-hole 257 provided at the bottom of the accumulator 25 up to the inside of the accumulator 25. The other ends of the first and second low-pressure communication pipes 31S and 31T connected to the first and second suction holes 135S and 135T through the first and second suction pipes 104 and 105 are inserted.

  The first and second low-pressure connecting pipes 31S and 31T that guide the low-pressure refrigerant of the refrigeration cycle to the first and second compression parts 12S and 12T through the accumulator 25 are the first and second suction pipes 104, The first and second cylinders 121S and 121T are connected to the first and second suction holes 135S and 135T (see FIG. 2) via the 105. That is, the first and second suction holes 135S and 135T communicate in parallel with the low pressure side of the refrigeration cycle.

  Connected to the top of the compressor housing 10 is a discharge pipe 107 that is connected to the high-pressure side of the refrigeration cycle and discharges high-pressure refrigerant gas to the high-pressure side of the refrigeration cycle. That is, the first and second discharge holes 190S and 190T communicate with the high pressure side of the refrigeration cycle.

  Lubricating oil is sealed in the compressor housing 10 up to the height of the second cylinder 121T. Further, the lubricating oil circulates in the compression unit 12 by a blade pump (not shown) inserted in the lower part of the rotary shaft 15, and lubricates the sliding parts, and places where the compression space of the compressed refrigerant is partitioned by a minute gap. Have a seal.

  Next, a characteristic configuration of the rotary compressor 1 according to the embodiment will be described with reference to FIGS. FIG. 3 is a partially enlarged longitudinal sectional view showing a compression portion of an embodiment of the rotary compressor according to the present invention, FIG. 4 is a longitudinal sectional view showing a closed state of the on-off valve of the embodiment, and FIG. FIG. 6 is a longitudinal sectional view showing an open state of the on-off valve of the embodiment, and FIG. 6 is a top view of a heat deformation member of the on-off valve of the embodiment.

  As shown in FIG. 3, the second cylinder 121T is provided with a mounting hole 135Ta penetrating from the upper surface to the second suction hole 135T. The on-off valve 50 of the embodiment is attached to the attachment hole 135Ta.

  As shown in FIGS. 4 to 6, the on-off valve 50 has a through hole 51 a in the center, a fixed portion 51 b that is press-fitted into the mounting hole 135 Ta and fixed at one end, and the other end is the valve. When the communication member 51 serving as the seat portion 51c and the through hole 51a of the valve seat portion 51c of the communication member 51 are normally closed and the inside of the compressor housing 10 reaches a predetermined temperature (for example, 130 ° C.) or more, the valve seat portion 51c. A heat deformation valve member 52 that opens the through hole 51a to return the refrigerant gas in the compressor housing 10 to the second suction hole 135T, a cap 53 that presses and holds the heat deformation valve member 52 against the valve seat portion 51c, It has.

  The attachment hole 135Ta may be a screw hole, and a male screw may be formed in the fixing portion 51b. The height of the communication member 51 is set such that the upper surface of the cap 53 attached to the communication member 51 is higher than the oil level of the oil stored in the lower portion of the compressor housing 10.

  When the temperature is less than 130 ° C. (predetermined temperature), the thermal deformation valve member 52 forms a circular dish shape having a concave portion 52a at the center as shown in FIG. When the recess 52a closes the through hole 51a of the valve seat 51c and the temperature reaches 130 ° C. or higher, the radially intermediate portion warps in a chevron shape and the outer periphery is the valve seat, as shown in FIG. The concave part 52a is lifted from the valve seat part 51c in contact with the outer peripheral part of the part 51c and opens the through hole 51a.

  Four through holes 52b for allowing the refrigerant gas to pass therethrough are provided in a radially intermediate portion of the thermal deformation valve member 52. Further, a through hole 53 b for allowing the refrigerant gas to pass therethrough is also provided at the center of the cap 53. A strainer of about 100 mesh may be attached to the through hole 53b to prevent clogging of foreign matter between the valve seat portion 51c and the heat deformation valve member 52.

  The space between the cap 53 and the valve seat portion 51 c is an oil reservoir 54. In the oil reservoir 54, during operation of the rotary compressor 1, mist-like oil blown out together with the refrigerant gas from the compressor 12 into the compressor housing 10 falls and gradually accumulates. While improving the sealing performance in the closed state of the heat deformation valve member 52 and the valve seat portion 51c, heat transfer to the heat deformation valve member 52 is improved.

  Next, operation | movement of the rotary compressor 1 of an Example is demonstrated. If the rotary compressor 1 is operated in a closed state due to an abnormal opening valve or a valve such as a three-way valve connected to the refrigeration cycle, the rotary compressor 1 draws refrigerant gas from the low pressure side of the refrigeration cycle. Can not breathe.

  The rotary compressor 1 cools the compression unit 12 and the motor 11 by the flow of the refrigerant gas. However, when the rotary compressor 1 is operated in a state where the refrigerant gas cannot be sucked, the sliding portion of the compression unit 12 becomes a high temperature, and the compression unit 12 Heat is transmitted to the thermal deformation valve member 52. When the temperature of the heat deformation valve member 52 becomes equal to or higher than a predetermined temperature (for example, 130 ° C.), the recess 52a rises from the valve seat 51c and opens the through hole 51a. As a result, the refrigerant gas in the compressor housing 10 flows into the second suction hole 135T through the through hole 51a and is sucked into the second compression part 12T to eliminate the high temperature operation of the second compression part 12T. Then, the temperature of the second compression unit 12T is lowered.

  At this time, the first compression unit 12S is also operated at a high temperature, but the refrigerant gas that has flowed into the second suction hole 135T through the through hole 51a flows into the second low-pressure communication pipe 31T, the accumulator 25, and the first low-pressure communication. The first compression unit 12S is sucked into the first compression unit 12S through the pipe 31S and the first suction hole 135S, and the high temperature operation of the first compression unit 12S is canceled to lower the temperature of the first compression unit 12S.

  According to the rotary compressor 1 of the embodiment described above, the mounting hole 135Ta that communicates with the second suction hole 135T is provided in the second cylinder 121T, and the on-off valve 50 that includes the communication member 51 and the thermal deformation valve member 52 is disposed in the mounting hole. It is simply installed at 135Ta (the opening / closing valve 50 does not need to be attached to the first cylinder 121S), forgetting to open a valve such as a three-way valve arranged in the refrigeration cycle, or the operation of the expansion valve Overheating of the compression unit 12 at the time of failure can be quickly eliminated, and abnormal wear of the compression unit 12 and burning of the motor 11 can be prevented. In addition, if a temperature sensor is disposed in the upper shell or the discharge pipe of the compressor housing and used in combination with a method of detecting an abnormal temperature and stopping the operation, the reliability is improved.

DESCRIPTION OF SYMBOLS 1 Rotary compressor 10 Compressor housing | casing 11 Motor 12 Compression part 15 Rotating shaft 25 Accumulator 31S 1st low-pressure connection pipe 31T 2nd low-pressure connection pipe 50 On-off valve 51 Communication member 51a Through-hole 51b Fixed part 51c Valve seat part 52 Thermal deformation Valve member 52a Recessed portion 52b Through hole 53 Cap 53b Through hole 54 Oil reservoir 101 First through hole 102 Second through hole 104 First suction pipe 105 Second suction pipe 107 Discharge pipe (discharge section)
111 Stator 112 Rotor 12S 1st compression part 12T 2nd compression part 121S 1st cylinder 121T 2nd cylinder 123S 1st cylinder inner wall 123T 2nd cylinder inner wall 124S 1st spring hole 124T 2nd spring hole 125S 1st annular piston 125T Second annular piston 127S First vane 127T Second vane 128S First vane groove 128T Second vane groove 129S First pressure introduction path 129T Second pressure introduction path 130S First working chamber 130T Second working chamber 131S First suction chamber 131T Second suction chamber 133S First compression chamber 133T Second compression chamber 135S First suction hole 135T Second suction hole 135Ta Mounting hole 136 Refrigerant passage 140 Intermediate partition plate 151 Lower bearing support portion 152S First eccentric portion 152T Second eccentricity Part 153 Upper bearing Holding portion 160S Lower end plate 160T Upper end plate 161S Lower bearing portion 161T Upper bearing portion 170S Lower muffler cover 170T Upper muffler cover 175 Bolt 180S Lower muffler chamber 180T Upper muffler chamber 190S First discharge hole 190T Second discharge hole 200S First discharge valve 200T Second discharge valve 201S First discharge valve retainer 201T Second discharge valve retainer 252 Accum holder 253 Accum band 255 System connection pipe 257 Bottom through-hole R Opening of first and second pressure introduction passages

Claims (1)

A sealed vertical compressor housing in which oil is stored at the bottom;
A motor for driving a rotating shaft disposed on an upper portion of the compressor housing and having a first eccentric portion and a second eccentric portion;
An annular first cylinder disposed at a lower portion of the compressor housing and radially provided with first suction holes and first vane grooves on a side portion, and a first eccentric portion of the rotary shaft, A first annular piston that revolves in the first cylinder along the inner wall of the first cylinder, a first vane that protrudes from the first vane groove into the first cylinder and contacts the first annular piston; A first compression unit configured to discharge compressed refrigerant gas into the compressor housing;
An annular second cylinder that is disposed on the first compression portion and is provided with a second suction hole and a second vane groove radially on the side portion, and a second eccentric portion of the rotating shaft. A second annular piston that revolves in the second cylinder along the inner wall of the second cylinder, and a second vane that protrudes from the second vane groove into the second cylinder and contacts the second annular piston. A second compression unit that discharges compressed refrigerant gas into the compressor housing; and
An accumulator attached to a side of the compressor housing;
A first low-pressure communication pipe having one end connected to the first suction hole and the other end inserted into the accumulator, and a second low-pressure communication having one end connected to the second suction hole and the other end inserted into the accumulator. Tube,
A rotary compressor comprising:
A mounting hole penetrating from the upper surface of the second cylinder to the second suction hole;
A communicating member in which a through hole is provided in the center and a fixing portion is formed at one end to be fixed to the mounting hole and the other end is a valve seat portion;
Normally, the through hole of the valve seat portion of the communication member is closed, and when the inside of the compressor housing reaches a predetermined temperature or more, the through hole of the valve seat portion is opened to allow the refrigerant gas in the compressor housing to pass through the second suction hole. A heat deformation valve member to return to
Equipped with a,
The thermally deformable member is held in a cap placed on the other end of the communication member, and the inside of the cap is an oil reservoir,
It said cap is provided with through holes for passing the refrigerant gas, into the hole, the rotary compressor characterized that you have strainer is attached to prevent foreign material from entering the cap.

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