WO2024053547A1 - Palier à feuilles de poussée, compresseur et dispositif de réfrigération - Google Patents

Palier à feuilles de poussée, compresseur et dispositif de réfrigération Download PDF

Info

Publication number
WO2024053547A1
WO2024053547A1 PCT/JP2023/031768 JP2023031768W WO2024053547A1 WO 2024053547 A1 WO2024053547 A1 WO 2024053547A1 JP 2023031768 W JP2023031768 W JP 2023031768W WO 2024053547 A1 WO2024053547 A1 WO 2024053547A1
Authority
WO
WIPO (PCT)
Prior art keywords
foil
foil piece
thrust
fixing
piece
Prior art date
Application number
PCT/JP2023/031768
Other languages
English (en)
Japanese (ja)
Inventor
直陸 大森
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Publication of WO2024053547A1 publication Critical patent/WO2024053547A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/02—Sliding-contact bearings

Definitions

  • the present disclosure relates to a thrust foil bearing, a compressor, and a refrigeration device.
  • Thrust foil bearings are conventionally known as bearings for high-speed rotating bodies.
  • Patent Document 1 discloses a thrust foil bearing that is arranged to face a thrust collar (thrust disk) provided on a rotating shaft.
  • the bearing surface is formed of a flexible thin metal plate (foil) so as to absorb movement of the rotating shaft (axial displacement and inclination of the thrust collar) caused by vibrations and impacts.
  • Thrust foil bearings have a foil structure below the bearing surface that flexibly supports the bearing surface.
  • a plurality of top foil pieces and a plurality of back foil pieces are arranged in an overlapping manner in the circumferential direction.
  • the top foil piece is supported by the back foil piece.
  • Rotation of the thrust collar introduces lubricating fluid between the top foil piece and the thrust collar.
  • This lubricating fluid forms a wedge-shaped fluid lubricating film between the top foil piece and the thrust collar, and the load capacity of the thrust foil bearing is demonstrated.
  • each of the top foil piece and the back foil piece is fixed to the base plate in order to prevent them from falling off the base plate.
  • the top foil piece is provided with a fixing allowance on the rear edge in the rotational direction of the rotating shaft, and the fixing allowance is fixed to the base plate.
  • a fixing margin is provided on the front edge of the back foil piece in the rotational direction of the rotating shaft, and the fixing margin is fixed to the base plate.
  • a gap is formed between the fixing allowance of the top foil piece and the fixing allowance of the back foil piece adjacent to the top foil piece so that they do not interfere with each other.
  • a gap of a certain size is formed between both fixing allowances.
  • thrust foil bearings that require a gap between the two fixing allowances have no choice but to reduce the area of the bearing surface that functions as a bearing, and the load capacity of the thrust foil bearing may not be obtained sufficiently. there were.
  • the purpose of the present disclosure is to improve the load capacity of thrust foil bearings.
  • the first aspect is a thrust foil bearing disposed facing a thrust disk (36) provided on a rotating shaft (35), and a top foil bearing disposed facing the thrust disk (36).
  • 80 a back foil (70) located on the opposite side of the thrust disk (36) in the top foil (80), and a back foil (70) located on the opposite side of the top foil (80) in the back foil (70).
  • an annular base plate (60) that supports the back foil (70).
  • the back foil (70) has a plurality of back foil pieces (71) arranged along the circumferential direction of the base plate (60).
  • the back foil piece (71) includes a support part (72) that supports the top foil (80), and a support part (72) on the front side of the support part (72) in the rotational direction of the rotation shaft (35).
  • a first fixing margin (73) that is formed continuously with the base plate (60) and is fixed to the base plate (60); and a first end edge (75) that is the front end in the rotational direction of the first fixing margin (73).
  • the top foil (80) has a plurality of top foil pieces (81) arranged to overlap each of the plurality of back foil pieces (71).
  • the top foil piece (81) includes a main body part (82) supported by the support part (72), and a main body part (82) that is continuous with the main body part (82) on the rear side of the main body part (82) in the rotational direction.
  • a second fixing margin (85) formed and fixed to the base plate (60); a second end edge (87) that is the rear end in the rotational direction of the second fixing margin (85); It includes a second boundary line (86) formed at the boundary between the main body part (82) and the second fixing margin (85).
  • the first edge (75) has a predetermined angle with respect to the first boundary line (74), or the second edge (87) has a predetermined angle with respect to the second boundary line (86).
  • the first fixing margin (73) of the back foil piece (71) is the top foil piece (81) supported by the other back foil piece (71) located next to the back foil piece (71). is fixed to the base plate (60) while overlapping with the second fixing margin (85).
  • the top foil piece (81) is supported by the first fixing margin (73) of the back foil piece (71) and the other back foil piece (71) adjacent to the back foil piece (71).
  • the second fixing margin (85) is fixed to the base plate (60) in a state where they overlap each other. Therefore, the area that does not function as a bearing surface in the thrust foil bearing can be made smaller. As a result, the area that functions as a bearing surface can be enlarged, and the load capacity of the thrust foil bearing can be improved.
  • the first edge (75) has a predetermined angle with respect to the first boundary line (74), or the second edge (87) has a predetermined angle with respect to the second boundary line (86). has a predetermined angle with respect to the Therefore, when fixing the first fixed allowance (73) and the second fixed allowance (85) adjacent to the first fixed allowance (73) by overlapping each other, the first boundary line (74) and the second boundary line ( 86) can be widened. Thereby, the work of fixing the first fixing margin (73) and the second fixing margin (85) to the base plate can be facilitated.
  • the first edge of the back foil piece (71) when the first end side (75) has a predetermined angle with respect to the first boundary line (74), the first edge of the back foil piece (71) The end edge (75) is along the second boundary line (86) of the top foil piece (81) that is supported by the other back foil piece (71) located next to the back foil piece (71). will be placed.
  • the first end side (75) of the back foil piece (71) is a top foil piece (81) supported by another back foil piece (71) adjacent to the back foil piece (71). along the second boundary line (86). Therefore, positioning when the first fixing margin (73) and the second fixing margin (85) adjacent to the first fixing margin (73) are overlapped and fixed can be easily performed. Thereby, the efficiency of fixing the back foil piece (71) and the top foil piece (81) can be improved.
  • the second edge of the top foil piece (81) is along the first boundary line (74) of the back foil piece (71) that supports the other top foil piece (81) located next to the top foil piece (81). Placed.
  • the second end side (87) of the top foil piece (81) is connected to the back foil piece (71) that supports another top foil piece (81) adjacent to the top foil piece (81). It is arranged along the first boundary line (74). Therefore, positioning when the first fixing margin (73) and the second fixing margin (85) adjacent to the first fixing margin (73) are overlapped and fixed can be easily performed. Thereby, the efficiency of fixing the back foil piece (71) and the top foil piece (81) can be improved.
  • the second fixing margin (85) of the top foil piece (81) is located next to the top foil piece (81). is fixed to the base plate (60) via the first fixing margin (73) of the back foil piece (71) that supports the top foil piece (81).
  • the back foil piece (71) and the top foil piece (81) are arranged and fixed to the base plate (60) in the order of the first fixing margin (73) and the second fixing margin (85). Ru. This is the same arrangement order of the base plate, back foil, and top foil, which are the components of the thrust foil bearing. This facilitates assembly of the thrust foil bearing (27).
  • the support portion (72) of the back foil piece (71) has a peak portion (76) when viewed from the radial direction of the rotating shaft (35). ) and valleys (77) are formed alternately.
  • the support portion (72) is formed with alternating peaks (76) and valleys (77), so it can elastically support the top foil piece (81).
  • the height of the mountain portion (76) increases toward the front side in the rotation direction.
  • the height of the peak portion (76) increases toward the front in the rotational direction. Therefore, a wedge-shaped gap can be formed between the thrust disk (36) and the top foil piece (81).
  • the base plate (60) supports the support part (72) of the back foil piece (71), and the thrust disk as it goes toward the rear side in the rotation direction. (36) including an inclined surface (62) that slopes away from (36);
  • the base plate (60) has an inclined surface (62). Therefore, a wedge-shaped gap can be formed between the thrust disk (36) and the top foil piece (81).
  • An eighth aspect is a compressor comprising the rotating shaft (35) having the thrust disk (36) and the thrust foil bearing (27) according to any one of the first to seventh aspects.
  • a compressor including a thrust foil bearing (27) with improved load capacity can be provided.
  • a ninth aspect is a refrigeration system including the compressor (20) of the eighth aspect and a refrigerant circuit (1a) through which refrigerant compressed by the compressor (20) flows.
  • a refrigeration system including a thrust foil bearing (27) with improved load capacity can be provided.
  • FIG. 1 is a schematic configuration diagram of a refrigeration apparatus according to a first embodiment.
  • FIG. 2 is a schematic longitudinal sectional view showing the overall configuration of the turbo compressor.
  • FIG. 3 is a side view of the thrust foil bearing of the present disclosure.
  • FIG. 4 is a top view showing the thrust foil bearing of the present disclosure.
  • FIG. 5 is a plan view of the back foil piece according to the first embodiment.
  • FIG. 6 is a plan view of the top foil piece according to the first embodiment.
  • FIG. 7 is an explanatory diagram showing how the back foil piece and top foil piece are fixed according to the first embodiment.
  • FIG. 8 is a side view of FIG. 7.
  • FIG. 9 is a diagram corresponding to FIG. 8 according to a modification of the first embodiment.
  • FIG. 10 is a diagram corresponding to FIG.
  • FIG. 11 is a diagram corresponding to FIG. 6 according to the second embodiment.
  • FIG. 12 is a diagram corresponding to FIG. 7 according to the second embodiment.
  • FIG. 13 is a diagram corresponding to FIG. 8 according to the second embodiment.
  • FIG. 14 is a diagram corresponding to FIG. 9 according to the second embodiment.
  • FIG. 15 is a diagram corresponding to FIG. 7 according to the third embodiment.
  • FIG. 16 is a diagram corresponding to FIG. 8 according to the third embodiment.
  • FIG. 17 is a diagram corresponding to FIG. 9 according to the third embodiment.
  • Embodiment 1 The thrust foil bearing of Embodiment 1 will be described with reference to the drawings.
  • the thrust foil bearing (27) of the present disclosure is applied, for example, to a turbo compressor (20) of a refrigeration system (1).
  • the refrigeration system (1) shown in Figure 1 consists of a turbo compressor (hereinafter also referred to as a compressor) (20) and a refrigerant circuit (20) through which refrigerant compressed by the compressor (20) flows. 1a).
  • the refrigerant circuit (1a) is filled with refrigerant.
  • the refrigerant circuit (1a) includes a compressor (20), a radiator (2), a pressure reduction mechanism (3), and an evaporator (4).
  • the pressure reduction mechanism (3) is an expansion valve.
  • the refrigerant circuit (1a) performs a vapor compression type refrigeration cycle.
  • the refrigerant compressed by the compressor (20) radiates heat to the air in the radiator (2).
  • the refrigerant that has radiated heat is depressurized by the pressure reducing mechanism (3) and evaporated in the evaporator (4).
  • the evaporated refrigerant is sucked into the compressor (20).
  • the refrigeration device (1) is an air conditioning device.
  • the air conditioner may be a cooling-only machine, a heating-only machine, or an air conditioner that switches between cooling and heating.
  • the air conditioner has a switching mechanism (for example, a four-way switching valve) that switches the refrigerant circulation direction.
  • the refrigeration device (1) may be a water heater, a chiller unit, a cooling device that cools the air inside the refrigerator, or the like. Cooling devices cool the air inside refrigerators, freezers, containers, etc.
  • the expansion mechanism consists of an electronic expansion valve, a temperature-sensitive expansion valve, an expander, or a capillary tube.
  • the compressor (20) of this embodiment is a single-stage type having one compression mechanism (50).
  • the compressor (20) includes a casing (21), a motor (30), a rotating shaft (35), and a compression mechanism (50).
  • the casing (21) accommodates the motor (30), the rotating shaft (35), and the compression mechanism (50).
  • the compressor (20) has a bearing that supports the rotating shaft (35).
  • the bearings include a radial bearing (26) and a thrust foil bearing (27).
  • the casing (21) has a body (22), a first closing part (23), and a second closing part (24).
  • the body (22) is formed into a cylindrical shape with both axial ends open.
  • the first closing portion (23) closes an open portion on one end side in the axial direction of the body portion (22).
  • the first closure part (23) includes a housing (25) located at its center.
  • the second closing portion (24) closes the open portion on the other axial end side of the body portion (22).
  • the motor (30) has a stator (31) and a rotor (32).
  • the stator (31) is formed into a cylindrical shape.
  • the stator (31) is fixed to the inner peripheral surface of the body (22) of the casing (21).
  • the rotor (32) is provided inside the stator (31).
  • the operating frequency (rotation speed) of the motor (30) is adjusted by an inverter device.
  • the compressor (20) is of an inverter type with variable rotation speed. Therefore, the rotation speed of the motor (30) changes between a relatively low rotation speed and a relatively high rotation speed.
  • Rotating shaft The rotating shaft (35) is fixed to the axial center of the rotor (32).
  • the rotating shaft (35) is rotationally driven by the motor (30).
  • the rotating shaft (35) extends along the axial direction of the casing (21).
  • the rotating shaft (35) has a thrust disk (36).
  • a thrust disk (36) is formed near the compression mechanism (50) on the rotating shaft (35).
  • the thrust disk (36) is a portion of the rotating shaft (35) with an enlarged diameter.
  • the thrust disk (36) is held between a pair of thrust foil bearings (27), which will be described later.
  • the radial bearing (26) supports the load (radial load) that acts in the radial direction of the rotating shaft (35) among the loads that act on the rotating shaft (35).
  • the compressor (20) of this embodiment has two radial bearings (26). The number and position of radial bearings (26) are merely examples.
  • One radial bearing (26) is arranged near one end of the rotating shaft (35).
  • the other radial bearing (26) is arranged near the other end of the rotating shaft (35).
  • Each radial bearing (26) is fixed to the body (22) of the casing (21) via a bearing support (28).
  • Each radial bearing (26) rotatably supports the rotating shaft (35).
  • Thrust foil bearing supports the load (thrust load) that acts in the axial direction of the rotating shaft (35) among the loads that act on the rotating shaft (35).
  • the compressor (20) of this embodiment has two thrust foil bearings (27).
  • the number and location of thrust foil bearings (27) is just an example.
  • the thrust foil bearing (27) is located near one end of the rotating shaft (35) (close to the compression mechanism (50)).
  • the thrust foil bearing (27) is fixed to the center of a bearing support (28) located near one end of the rotating shaft (35).
  • the thrust foil bearing (27) restricts axial movement of the rotating shaft (35).
  • the compression mechanism (50) is a centrifugal compression mechanism that applies kinetic energy to the fluid by the centrifugal force of the impeller (51) and converts this kinetic energy into pressure.
  • the compression mechanism (50) includes a housing (25) and an impeller (51).
  • the impeller (51) has multiple blades.
  • a compression chamber (52) is formed between the housing (25) and the impeller (51).
  • a suction passage (53) for sending fluid (refrigerant) to the compression chamber (52) is formed in the housing (25).
  • thrust foil bearing (27) will be explained in detail with reference to FIGS. 3 to 8.
  • two thrust foil bearings (27) are provided on both sides of the thrust disk (36).
  • the compressor (20) has a pair of thrust foil bearings (27).
  • Each of the thrust foil bearings (27) has the same configuration.
  • Each thrust foil bearing (27) is arranged facing the thrust disk (36).
  • the thrust foil bearing (27) has a top foil (80), a back foil (70), and a base plate (60).
  • the top foil (80) is arranged opposite the thrust disk (36).
  • the back foil (70) is located on the opposite side of the top foil (80) from the thrust disk (36).
  • the base plate (60) is arranged on the back foil (70) opposite the top foil (80).
  • the back foil (70) is composed of a plurality of back foil pieces (71).
  • the top foil (80) is composed of a plurality of top foil pieces (81).
  • the same number of back foil pieces (71) and top foil pieces (81) of this embodiment are provided.
  • One back foil piece (71) is provided correspondingly to one top foil piece (81). Note that the same number of top foil pieces (81) and back foil pieces (71) may not be provided.
  • a cylindrical bearing spacer (40) shown by a two-dot chain line in FIG. 3 is sandwiched between the base plate (60) of each of the pair of thrust foil bearings (27). These base plates (60) are connected via a bearing spacer (40) by a fastening bolt (41).
  • a plurality (in this embodiment, three) of through holes (42) for inserting the fastening bolts (41) are formed in the outer peripheral portion of the base plate (60). Note that one of the base plates (60) connected in this way comes into contact with the bearing support (28) by tightening with the fastening bolt (41).
  • axial direction refers to the direction of the axis of the rotating shaft (35)
  • radial direction refers to the direction of the axis of the rotating shaft (35)
  • circumferential direction refers to the circumferential direction with respect to the axis of the rotating shaft (35).
  • the “radially inner side” is the side closer to the axis of the rotating shaft (35)
  • the “radially outer side” is the side farther from the axis of the rotating shaft (35).
  • rotation direction is the rotation direction of the rotation shaft (35) shown by arrow Q in FIG.
  • the base plate (60) constitutes the outermost part of the thrust foil bearing (27) in the axial direction. In other words, the base plate (60) is located at the farthest position from the thrust disk (36) in the axial direction in each thrust foil bearing (27).
  • the base plate (60) is a plate-shaped member made of metal and approximately several mm thick. As shown in FIG. 4, the base plate (60) has an annular shape. The surface of the base plate (60) of this embodiment is a flat surface with no steps.
  • a plurality of support areas (61) are formed on the surface of the base plate (60) on the thrust disk (36) side.
  • the support region (61) is a portion for supporting the back foil piece (71) and the top foil piece (81) corresponding to the back foil piece (71).
  • the top foil piece (81) is supported by the back foil piece (71), which is supported by the support area (61) of the base plate (60).
  • the base plate (60) is formed with six support regions (61) equally divided in the circumferential direction. Note that all the support regions (61) in this embodiment are formed on one flat surface.
  • the back foil (70) elastically supports the top foil (80).
  • the back foil (70) is supported by the base plate (60).
  • the back foil (70) of this embodiment is a bump foil formed by press-molding a thin plate into a corrugated plate shape.
  • the back foil (70) has six back foil pieces (71) arranged along the circumferential direction of the base plate (60).
  • the number of back foil pieces (71) is just an example.
  • Each back foil piece (71) is placed on a respective support area (61) of the base plate (60).
  • the back foil piece (71) is a thin metal plate (foil) with a thickness of several tens of ⁇ m to several hundred ⁇ m. As shown in FIG. 5, the back foil piece (71) has a support portion (72), a first fixing margin (73), a first boundary line (74), and a first edge (75). .
  • the support portion (72) is a portion that supports the top foil piece (81).
  • the support portion (72) is formed into a substantially trapezoidal shape by cutting out the apex side of the sector and making each of the inner and outer edges arcuate.
  • the support portion (72) has a plurality of peaks (76) and a plurality of troughs (77).
  • the support portion (72) is formed in a corrugated plate shape when viewed from the radial direction of the rotating shaft (35).
  • the supporting portion (72) has a valley in the normal direction (hereinafter referred to as the first direction) orthogonal to the end side of the supporting portion (72) in the circumferential direction (front side in the rotational direction Q). It is formed by an alternating series of parts (77) and peaks (76).
  • This first direction is also referred to as a direction perpendicular to the ridgeline of the mountain portion (76).
  • one side in the first direction refers to the right side in FIG. 5, and the other side in the first direction refers to the left side in FIG.
  • the "circumferential direction" and the "first direction” are different directions.
  • the valley (77) is a flat surface.
  • the valley (77) faces the base plate (60).
  • the valley (77) can come into contact with the base plate (60).
  • the peak portion (76) is formed in an arch shape that connects adjacent valley portions (77).
  • each of the troughs (77) and peaks (76) is formed at approximately the same pitch.
  • the height of the crest (76) increases as you move toward the front side in the rotation direction Q of the rotation shaft (35). , increasing in order.
  • one side in the circumferential direction front side in the rotation direction Q
  • the other side in the circumferential direction back side in the rotation direction Q
  • the first fixing margin (73) is a part that is fixed to the base plate (60). As shown in FIG. 5, the first fixing allowance (73) is formed at one end of the support portion (72) in the circumferential direction (in the present embodiment, the front side in the rotation direction Q). The first fixing margin (73) is formed continuously with the support portion (72).
  • the first fixing allowance (73) is formed in a flat band shape extending in the radial direction.
  • the first fixing allowance (73) is a portion extending further toward one side in the circumferential direction from the end side on one side in the circumferential direction of the support portion (72).
  • the first fixed margin (73) is configured as a flat surface that is flush with the valley (77).
  • the other end in the circumferential direction (in this embodiment, the rear side in the rotational direction Q) of the support portion (72) is a free end that is not fixed to the base plate (60).
  • the first boundary line (74) is formed at the boundary between the support portion (72) and the first fixing margin (73). Specifically, the first boundary line (74) is an edge on one side in the circumferential direction of the support portion (72), and an edge on the other side in the circumferential direction of the first fixing margin (73). The first boundary line (74) extends in the radial direction.
  • the first edge (75) is the edge on one side in the circumferential direction (front side in the rotational direction Q) of the first fixing allowance (73), and the edge on one side in the circumferential direction (front side in the rotational direction Q) of the back foil piece (71). front side).
  • the first end side (75) of the back foil piece (71) has a predetermined angle on the front side in the rotation direction Q with respect to the first boundary line (74).
  • the first end side (75) and the first boundary line (74) are not arranged in parallel. Therefore, the width (length in the circumferential direction) of the first fixing margin (73) formed between the first end side (75) and the first boundary line (74) is from the inner end in the radial direction to the outer end. It gradually expands towards the
  • a plurality of (two in this embodiment) slits (78) extending in the circumferential direction from the other side to the one side in the circumferential direction are formed in the support portion (72).
  • the slit (78) is formed in an arc shape.
  • the slit (78) extends to the peak (76) adjacent to the first fixing margin (73).
  • the support portion (72) is divided into a plurality of (three in this embodiment) divided regions (79) in the radial direction by the plurality of slits (78).
  • the three divided regions (79) are each movable in the first direction.
  • top foil (80) acts as a bearing surface during operation of the thrust foil bearing (27).
  • the top foil (80) is supported by the back foil (70).
  • the top foil (80) has six top foil pieces (81) arranged along the circumferential direction.
  • the number of top foil pieces (81) is merely an example; each top foil piece (81) is arranged over a corresponding back foil piece (71).
  • the top foil piece (81) is a thin metal plate (foil) with a thickness of several tens of ⁇ m to several hundred ⁇ m. As shown in FIG. 6, the top foil piece (81) has a main body (82), a second fixing margin (85), a second boundary line (86), and a second end side (87). .
  • the main body portion (82) is a portion supported by the corresponding back foil piece (71).
  • the main body portion (82) is formed into a substantially trapezoidal shape by cutting out the fan-shaped apex side and making each of the inner circumferential side and the outer circumferential side arc-shaped.
  • the main body portion (82) includes a supported portion (83) and a raised portion (84).
  • the supported part (83) is supported by the support part (72) of the corresponding back foil piece (71).
  • the supported portion (83) is arranged to rest on the top of the peak (76) in the support portion (72).
  • the supported portion (83) is inclined at an initial inclination angle so as to approach the thrust disk (36) toward one side in the circumferential direction (the front side in the rotational direction Q) (upward in FIG. 8).
  • the initial inclination angle is the inclination angle of the top foil piece (81) with respect to the base plate (60) when the load applied to the thrust foil bearing (27) is zero.
  • the supported portion (83) is provided to be inclined with respect to the support area (61) of the base plate (60).
  • the rising part (84) connects the supported part (83) and the second fixing margin (85), and also controls the size of the gap formed between the supported part (83) and the thrust disk (36). This is the part for adjusting the brightness.
  • the rising portion (84) is formed on the other end of the supported portion (83) in the circumferential direction (rear side in the rotational direction Q).
  • the upright portion (84) extends in the radial direction and is formed in a band shape.
  • the rising portion (84) is formed in a step-like shape. Specifically, as shown in FIG. 6, the rising portion (84) has a first bent portion (84a) and a second bent portion (84b).
  • the first bent portion (84a) is a portion located on the other circumferential side of the raised portion (84).
  • the first bent portion (84a) is bent toward the side opposite to the surface of the raised portion (84) that faces the base plate (60).
  • the second bent portion (84b) is a bent portion located on one circumferential side of the upright portion (84).
  • the second bent portion (84b) is bent toward the surface of the raised portion (84) that faces the base plate (60). Note that both the first bent portion (84a) and the second bent portion (84b) are bent at an obtuse angle with respect to the base plate (60).
  • the second fixing allowance (85) is a part that is fixed to the base plate (60). Specifically, as shown in FIG. 8, the second fixing allowance (85) is attached to the base plate (60) via the first fixing allowance (73) of the back foil piece (71) adjacent to the other side in the circumferential direction. Fixed.
  • the second fixing allowance (85) is formed at the other end of the main body (82) in the circumferential direction (the rear side in the rotational direction Q). Specifically, the second fixing allowance (85) is formed at the other end of the raised portion (84) in the circumferential direction.
  • the second fixing margin (85) is formed continuously with the main body (82).
  • the second fixing allowance (85) is formed in a flat band shape extending in the radial direction.
  • the second fixing allowance (85) is a portion that extends from the other end of the main body (82) in the circumferential direction to the other side in the circumferential direction.
  • the end of the main body (82) on one side in the circumferential direction is a free end that is not fixed to the base plate (60).
  • the second boundary line (86) is formed at the boundary between the main body (82) and the second fixing margin (85). Specifically, the second boundary line (86) is the edge on the other side in the circumferential direction of the rising portion (84) of the main body (82), and is the edge on the other side in the circumferential direction in the second fixing allowance (85). It's on the edge.
  • the second boundary line (86) extends in the radial direction.
  • the second end side (87) is the end side of the second fixing allowance (85) on the other side in the circumferential direction (the rear side in the rotational direction Q).
  • the second end side (87) is the end side of the top foil piece (81) on the other side in the circumferential direction (front side in the rotational direction Q).
  • the second end side (87) is generally parallel to the second boundary line (86). Therefore, the width (circumferential length) of the second fixing allowance (85) formed between the second end side (87) and the second boundary line (86) is from the radially inner end to the outer end. It is generally the same throughout.
  • the first fixing allowance (73) of the back foil piece (71) is on one side in the circumferential direction of the back foil piece (71).
  • the second fixing margin (85) of the top foil piece (81) supported by the other back foil piece (71) adjacent to the top foil piece (81) is fixed to the base plate (60) in a mutually overlapping state.
  • the second fixing allowance (85) of the top foil piece (81) is connected via the first fixing allowance (73) of the back foil piece (71) adjacent to the other circumferential side of the top foil piece (81). and fixed to the base plate (60).
  • the first fixing allowance (73) of the back foil piece (71) and the second fixing allowance (85) of the top foil piece (81) adjacent to the back foil piece (71) overlap. is fixed to the base plate (60).
  • the fixing area is the top foil piece ( 81)
  • the width of the fixed region (90) of this embodiment is generally the same from the inner end to the outer end in the radial direction.
  • the first fixing margin (73) and the second fixing margin (85) are fixed by spot welding to the base plate (60).
  • a plurality of fixing parts (in this embodiment, welded parts) (91) are formed in a line in the radial direction in the fixing region (90).
  • the back foil piece (71) and the top foil piece (81) may be fixed to the base plate (60) by means other than spot welding.
  • the back foil piece (71) and the top foil piece (81) may be fixed to the base plate (60) by caulking, riveting, screwing, or the like.
  • the first end side (75) of the back foil piece (71) It is arranged along the second boundary line (86) of the top foil piece (81) that is supported by another back foil piece (71) located next to it.
  • the first edge (75) of the back foil piece (71) is arranged parallel to the second boundary line (86) of the adjacent top foil piece (81).
  • the first end side (75) of the back foil piece (71) is used as a positioning mark to secure the top foil piece.
  • (81) can be placed on top of each other.
  • the top foil piece (81) is arranged so that the first edge (75) of the back foil piece (71) and the second boundary line (86) of the top foil piece (81) overlap. Therefore, it is not necessary to provide a positioning mark to the back foil piece (71), and the top foil piece (81) can be easily positioned. Thereby, the efficiency of fixing the top foil piece (81) and the back foil piece (71) can be improved.
  • the thrust foil bearings (27) are provided on both sides of the thrust disk (36). Thereby, movement of the rotating shaft (35) on both sides in the thrust direction can be suppressed.
  • the thrust foil bearing (27) is provided with a plurality of pairs (hereinafter referred to as pads) of a top foil piece (81) and a back foil piece (71) that supports the top foil piece (81). It is being In the conventional thrust foil bearing (27), the fixing allowance for the top foil piece (81) and the fixing allowance for the back foil piece (71) are arranged in the space between the pad and another pad adjacent to the pad. , each fixed directly to the base plate (60).
  • the width of the fixing allowance of the top foil piece (81), the width of the fixing allowance of the back foil piece (71), and the width of the fixing allowance of the back foil piece (71) between adjacent pads are A gap of the same size as the tolerance width is required.
  • the first end side (75) of the back foil piece (71) has a predetermined angle with respect to the first boundary line (74).
  • the first fixing margin (73) of the back foil piece (71) is the first fixing allowance (73) of the top foil piece (81) that is supported by another back foil piece (71) located next to the back foil piece (71). It is fixed to the base plate (60) in a state where it overlaps with the two fixing allowances (85).
  • each of the first fixing margin (73) and the second fixing margin (85) was individually fixed to the base plate (60).
  • the thrust foil bearing (27) of this embodiment is fixed to the base plate (60) with the first fixing allowance (73) and the second fixing allowance (85) overlapping each other. This reduces the number of fixing points by half, reducing the time required for fixing work and reducing the number of defective products due to failures in fixing work.
  • the first fixing margin (73) and the second fixing margin (85) are fixed so as to overlap each other.
  • the distance between the first boundary line (74) and the second boundary line (86) can be increased. This makes it possible to secure a working space for fixing the first fixing margin (73) and the second fixing margin (85) to the base plate (60), thereby facilitating the fixing work.
  • the first edge (75) of the back foil piece (71) is the second boundary of the top foil piece (81) supported by another back foil piece (71) located next to the back foil piece (71). Placed along line (86).
  • the second fixing allowance (85) of the top foil piece (81) is the first fixing allowance of the back foil piece (71) that supports another top foil piece (81) located next to the top foil piece (81). (73) and is fixed to the base plate (60).
  • the support portion (72) of the back foil piece (71) is formed with alternating peaks (76) and valleys (77) when viewed from the radial direction of the rotating shaft (35). Thereby, the back foil piece (71) can elastically support the top foil piece (81).
  • the configurations of the back foil piece (71) and the base plate (60) are changed in the thrust foil bearing (27) of the above embodiment.
  • the plurality of peaks (76) in the support portion (72) are each formed to have the same height.
  • each support region (61) is formed with an inclined surface (62) and a flat surface (63) formed continuously with the inclined surface (62).
  • the inclined surface (62) is formed on the rear side of the support region (61) in the rotation direction Q.
  • the height of the inclined surface (62) increases along the rotation direction Q. That is, the height of the inclined surface (62) (height in the axial direction of the rotating shaft (35)) increases toward the front side in the rotating direction Q. In other words, the inclined surface (62) is inclined away from the thrust disk (36) toward the rear side in the rotation direction Q.
  • the flat surface (63) is formed on the front side in the rotation direction Q in the support region (61).
  • the flat surface (63) is a flat surface that is not inclined in the support region (61).
  • the flat surface (63) continues from the highest position (front end in the rotation direction Q) of the inclined surface (62) to the support area boundary line (64) formed between adjacent support areas (61). It is a surface.
  • the flat surface (63) is a surface that is generally parallel to the back surface of the base plate (60).
  • the flat surface (63) is formed in a band shape extending in the radial direction.
  • a surface boundary line (65) between the inclined surface (62) and the flat surface (63) is formed along the radial direction of the base plate (60). Further, the support area boundary line (64) is also formed along the radial direction of the base plate (60).
  • the height of the inclined surface (62) is inclined so as to gradually become lower in the direction perpendicular to the surface boundary line (65). Therefore, a step is formed in a portion where each support area boundary line (64) is formed (between adjacent support areas (61) with each support area boundary line (64) in between).
  • the back foil piece (71) is placed on the sloped surface (62) and flat surface (63) of the support area (61). This allows a wedge-shaped gap to be formed between the top foil piece (81) and the thrust disk (36).
  • a support region boundary line (64) is formed between mutually adjacent support regions (61).
  • the support area boundary line (64) and the first end side (75) of the back foil piece (71) are arranged to overlap. In this way, when assembling the thrust foil bearing (27), the first end (75) of the back foil piece (71) can be overlapped using the support area boundary line (64) of the base plate (60) as a guide. Therefore, the positioning work of the back foil piece (71) can be facilitated.
  • the first end side (75) of the back foil piece (71) is arranged along the second boundary line (86) of the adjacent top foil piece (81). Positioning work when fixing the first fixing margin (73) and the second fixing margin (85) in an overlapping manner can be facilitated. Thereby, the efficiency of fixing work can be further improved.
  • the thrust foil bearing (27) of Embodiment 2 will be explained.
  • the thrust foil bearing (27) of this embodiment is the thrust foil bearing (27) of Embodiment 1 in which the configurations of the back foil piece (71) and the top foil piece (81) are changed.
  • differences from Embodiment 1 regarding the thrust foil bearing (27) of this embodiment will be explained.
  • first end side (75) of the back foil piece (71) of this embodiment is generally parallel to the first boundary line (74). Therefore, the width (length in the circumferential direction) of the first fixing margin (73) formed between the first end side (75) and the first boundary line (74) is It is generally the same across the edges.
  • the second end side (87) of the top foil piece (81) of this embodiment has a predetermined angle on the rear side in the rotation direction Q with respect to the second boundary line (86).
  • the second end side (87) and the second boundary line (86) are not arranged in parallel. Therefore, the width (length in the circumferential direction) of the second fixing allowance (85) formed between the second end side (87) and the second boundary line (86) is It gradually widens towards the edge.
  • the first fixing allowance (73) of the back foil piece (71) is fixed to the other back foil piece (71) adjacent to one side in the circumferential direction of the back foil piece (71).
  • the second fixing margin (85) of the supported top foil piece (81) is fixed to the base plate (60) in a mutually overlapping state.
  • the area that does not function as a bearing surface in the thrust foil bearing (27) (the portion where the back foil piece (71) and the top foil piece (81) are fixed) can be reduced. Accordingly, the area of the region functioning as the bearing surface in the thrust foil bearing (27) can be increased, so that the load capacity of the thrust foil bearing (27) can be improved.
  • the width of the fixed region (90) of this embodiment is formed so as to gradually increase from the inner end to the outer end in the radial direction.
  • the second end side (87) of the top foil piece (81) It is arranged along a first boundary line (74) of a back foil piece (71) that supports another top foil piece (81) located next to it.
  • the second end side (87) of the top foil piece (81) is arranged parallel to the first boundary line (74) of the adjacent back foil piece (71).
  • the first boundary line (74) of the back foil piece (71) is used as a positioning mark to fix the top foil piece (81) and the back foil piece (71) to the base plate (60).
  • (81) can be placed on top of each other.
  • the top foil piece (81) is arranged so that the first boundary line (74) of the back foil piece (71) and the second end side (87) of the top foil piece (81) overlap. Therefore, it is not necessary to provide a positioning mark to the back foil piece (71), and the top foil piece (81) can be easily positioned. Thereby, the efficiency of fixing the top foil piece (81) and the back foil piece (71) can be improved.
  • each support region (61) is formed with an inclined surface (62) and a flat surface (63) formed continuously with the inclined surface (62).
  • the configurations of the inclined surface (62) and the flat surface (63) are similar to those of the modified example of the first embodiment.
  • the second end side (87) of the top foil piece (81) is arranged along the first boundary line (74) of the adjacent back foil piece (71). Therefore, positioning work when fixing the first fixing margin (73) and the second fixing margin (85) in an overlapping manner can be facilitated. Thereby, the efficiency of fixing work can be further improved.
  • the thrust foil bearing (27) of Embodiment 3 will be explained.
  • the thrust foil bearing (27) of this embodiment is the thrust foil bearing (27) of Embodiment 1 in which the configurations of the back foil piece (71) and the top foil piece (81) are changed.
  • differences from Embodiment 1 regarding the thrust foil bearing (27) of this embodiment will be explained.
  • the back foil piece (71) of this modification has the same configuration as the back foil piece (71) of the first embodiment.
  • the first end side (75) of the back foil piece (71) has a predetermined angle on the front side in the rotation direction Q with respect to the first boundary line (74).
  • the first end side (75) and the first boundary line (74) are not arranged in parallel. Therefore, the width (length in the circumferential direction) of the first fixing margin (73) formed between the first end side (75) and the first boundary line (74) is from the inner end in the radial direction to the outer end. It gradually expands towards the Specifically, the first fixing margin (73) of this embodiment is formed into a fan shape with a small central angle.
  • the top foil piece (81) of this modification has the same configuration as the top foil piece (81) of the second embodiment.
  • the second end side (87) of the top foil piece (81) has a predetermined angle on the rear side in the rotation direction Q with respect to the second boundary line (86).
  • the second end side (87) and the second boundary line (86) are not arranged in parallel. Therefore, the width (length in the circumferential direction) of the second fixing allowance (85) formed between the second end side (87) and the second boundary line (86) is It gradually widens towards the edge.
  • the second fixing margin (85) of this embodiment is formed into a fan shape with a small central angle.
  • the first fixing allowance (73) of the back foil piece (71) is fixed to the other back foil piece (71) adjacent to one side in the circumferential direction of the back foil piece (71).
  • the second fixing margin (85) of the supported top foil piece (81) is fixed to the base plate (60) in a mutually overlapping state.
  • each of the first fixing allowance (73) and the second fixing allowance (85) gradually widens from the inner end to the outer end in the radial direction. Therefore, the fixing region (90) where the first fixing margin (73) and the second fixing margin (85) overlap is formed in a fan shape.
  • the fixing region (90) of this embodiment has the smallest area when the first fixing margin (73) and the second fixing margin (85) are overlapped and fixed to the base plate (60). In other words, in this embodiment, the distance between adjacent pads can be made the narrowest. Thereby, in this embodiment, the area that does not function as a bearing surface can be minimized. Accordingly, a larger area of the region functioning as a bearing surface can be ensured, so that the load capacity as a thrust foil bearing can be further improved.
  • the fixing region (90) is formed in a narrow fan shape with a small central angle, so the fixing portion (91) is provided only on the radially outer side of the fixing region (90). In other words, the fixing portion (91) is not provided on the radially inner side of the fixing region (90). This reduces the number of work steps required to form the fixing portion (91).
  • the first end side (75) of the back foil piece (71) is arranged along the second boundary line (86) of the adjacent top foil piece (81).
  • the second end side (87) of the top foil piece (81) is arranged along the first boundary line (74) of the adjacent back foil piece (71).
  • each support region (61) is formed with an inclined surface (62) and a flat surface (63) formed continuously with the inclined surface (62).
  • the configurations of the inclined surface (62) and the flat surface (63) are similar to those of the modified example of the first embodiment.
  • the first end side (75) of the back foil piece (71) is arranged along the second boundary line (86) of the adjacent top foil piece (81).
  • the second end side (87) of the top foil piece (81) is arranged along the first boundary line (74) of the adjacent back foil piece (71).
  • the above embodiment may have the following configuration.
  • the back foil (70) in each of the above embodiments may be other than a corrugated bump foil. Specifically, it may be a spring foil as disclosed in JP-A No. 2004-270904, a back foil as described in JP-A No. 2009-299748, JP-A No. 2017-180685, and the like. Note that the back foil described in the above publication is a foil used for radial bearings, but it can be applied to foils used for thrust foil bearings by developing it into a flat shape and forming it into an annular plate shape. be.
  • the present disclosure is useful for thrust foil bearings, compressors, and refrigeration equipment.
  • Refrigeration equipment 1a Refrigerant circuit 20 Turbo compressor (compressor) 27 Thrust foil bearing 35 Rotation axis 36 Thrust Disc 60 base plate 62 Slope 70 back foil 71 Back foil piece 72 Support part 73 First fixed fee 74 First boundary line 75 First edge 76 Yamabe 77 Tanibe 80 top foil 81 Top foil piece 82 Main body 85 Second fixed fee 86 Second boundary line 87 Second edge

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un palier à feuilles de poussée (27) dans lequel un premier côté d'extrémité (75) présente un angle prédéterminé par rapport à une première ligne de limite (74), ou un second côté d'extrémité (87) présente un angle prédéterminé par rapport à une seconde ligne de limite (86). Une première partie de fixation (73) d'une feuille arrière (70) est fixée à une plaque de base (60) dans un état dans lequel la première partie de fixation (73) chevauche une seconde partie de fixation (85) d'une feuille supérieure (80) qui est supportée par une autre feuille arrière (70) située à côté de la feuille arrière (70).
PCT/JP2023/031768 2022-09-07 2023-08-31 Palier à feuilles de poussée, compresseur et dispositif de réfrigération WO2024053547A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022142546A JP7538436B2 (ja) 2022-09-07 2022-09-07 スラストフォイル軸受、圧縮機、及び冷凍装置
JP2022-142546 2022-09-07

Publications (1)

Publication Number Publication Date
WO2024053547A1 true WO2024053547A1 (fr) 2024-03-14

Family

ID=90190976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/031768 WO2024053547A1 (fr) 2022-09-07 2023-08-31 Palier à feuilles de poussée, compresseur et dispositif de réfrigération

Country Status (2)

Country Link
JP (1) JP7538436B2 (fr)
WO (1) WO2024053547A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009185857A (ja) * 2008-02-05 2009-08-20 Shimadzu Corp 動圧気体軸受の取付構造
JP2015183568A (ja) * 2014-03-24 2015-10-22 株式会社豊田自動織機 流体機械
WO2020149421A1 (fr) * 2019-01-18 2020-07-23 株式会社Ihi Palier de butée à plaquettes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3130741A1 (fr) 2019-02-22 2020-08-27 Ihi Corporation Palier de butee a feuilles et procede de fabrication de plaque de base de palier de butee a feuilles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009185857A (ja) * 2008-02-05 2009-08-20 Shimadzu Corp 動圧気体軸受の取付構造
JP2015183568A (ja) * 2014-03-24 2015-10-22 株式会社豊田自動織機 流体機械
WO2020149421A1 (fr) * 2019-01-18 2020-07-23 株式会社Ihi Palier de butée à plaquettes

Also Published As

Publication number Publication date
JP7538436B2 (ja) 2024-08-22
JP2024037603A (ja) 2024-03-19

Similar Documents

Publication Publication Date Title
CN114174686B (zh) 用于支撑旋转压缩机轴的轴承
JP2014037890A (ja) ジャーナルフォイルエアベアリング
US11773907B2 (en) Thrust gas bearing, centrifugal compressor equipped with same, and refrigeration apparatus equipped with same
KR20130091445A (ko) 가스포일 저널베어링 및 이를 포함하는 칠러시스템
WO2024053547A1 (fr) Palier à feuilles de poussée, compresseur et dispositif de réfrigération
JP7230927B2 (ja) スラストフォイル軸受
CN115573938A (zh) 紧凑可变几何形状的扩散器机构
WO2020050240A1 (fr) Palier de butée à feuilles
US20200400160A1 (en) Turbo compressor
JP7406142B1 (ja) スラストフォイル軸受、圧縮機、冷凍装置、及びスラストフォイル軸受のベースプレートの製造方法
KR102113036B1 (ko) 터보 압축기 및 이를 포함하는 터보 냉동기
JP2020115021A (ja) スラストフォイル軸受装置
JP5741197B2 (ja) ロータの端部材、該ロータ端部材を備えたモータおよび該モータを備えた圧縮機
JPWO2018216164A1 (ja) プロペラファン及び冷凍サイクル装置
JP6661589B2 (ja) 圧縮機、及び、これを備える冷凍サイクル装置
JP7244780B1 (ja) ラジアルフォイル軸受、圧縮機、および冷凍装置
WO2023053881A1 (fr) Palier-feuille radial, compresseur et dispositif de réfrigération
CN217383125U (zh) 一种室外空调器
CN114483657B (zh) 压缩机以及包括该压缩机的冷却装置
CN218913161U (zh) 一种转子式压缩机及空调器
US20240133393A1 (en) Turbo-type fluid machine and refrigeration apparatus
US20210239113A1 (en) Compressor Bearing
JP2021017853A (ja) 圧縮機、室外機および空気調和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23863085

Country of ref document: EP

Kind code of ref document: A1