compressor

Abstract

A compressor 1 includes a container 10, a crankshaft 36 including an annular mounting concave groove 36c formed on an outer peripheral surface of the crankshaft 36, a compression mechanism 20 provided above the crankshaft 36 and configured to compress a refrigerant taken in from the outside by rotation of the crankshaft 36, and a stopper 40 including a first stopper member 42 and a second stopper member 44 and including a through-hole 46 formed between the first stopper member 42 and the second member. The crankshaft 36 is inserted into the through-hole 46 of the stopper 40, and the stopper 40 is engaged and fixed on the annular mounting concave groove 36c.

Description

TECHNICAL FIELD

[0001] The present application relates to a compressor. BACKGROUND

[0002] Known compressors include a main bearing interposed between a crankshaft and a housing, and accepting a radial load acting in a radial direction of the crankshaft, and a thrust ball bearing having an inner ring and an outer ring each having a recessed contact portion receiving balls as disclosed in Japanese Patent Application Laid-Open Publication No. H05-018384 Al, hereinafter referred to as PTL 1.

[0003] In PTL 1, the inner ring of the thrust ball bearing enters a non-contact state in the radial direction of the crankshaft, and is locked in the axial direction of the crankshaft. Further, the outer ring of the thrust ball bearing is locked to the housing.

[0004] However, when a vehicle is driven, in the case where the compressor is installed in the vehicle, a large force is applied to the crankshaft to displace the crankshaft in the up-and-down direction. Thus, there is a possibility that the crankshaft collides with the compression mechanism.

[0005] Therefore, there is a need to develop a compressor that prevents an impact by a crankshaft of a compressor installed in a vehicle from being applied to a compression mechanism when the vehicle is driven.

[0006] LIST OF CITATIONS

[0007] PATENT LITERATURE

[0008] PTL 1: Japanese Patent Application Laid-Open Publication No. H05-018384 Al. SUMMARY

[0009] An object of the present application is to provide a compressor that prevents an impact by a crankshaft of a compressor installed in a vehicle from being applied to a compression mechanism when the vehicle is driven.

[0010] To achieve the above object, an embodiment of the present application provides a compressor including: a container; a crankshaft housed in the container, the crankshaft including an annular mounting recessed groove formed on an outer peripheral surface of the crankshaft; a compression mechanism housed in the container, disposed above the crankshaft, and configured to compress a refrigerant drawn in from the outside by rotation of the crankshaft; and a stopper that is a plate-like member including a first plane and a second plane, the stopper including a first stopper member and a second stopper member, and including a through-hole formed between the first stopper member and the second member and penetrating from the first plane to the second plane. Further, the crankshaft is inserted into the through-hole of the stopper, and the stopper is engaged and fixed on the annular mounting recessed groove.

[0011] According to an embodiment of the present application, first, since the stopper includes two members (i.e., a first stopper member and a second stopper member), the stopper can be installed around the crankshaft.

[0012] Second, since the crankshaft is inserted into the through hole of the stopper, and the stopper is engaged and fixed on the annular installation recessed groove, even if a large force acting to displace the crankshaft in the up-and-down direction is applied to the crankshaft, the crankshaft can be prevented from being displaced in the up-and-down direction.

[0013] Therefore, when the vehicle is driven, an impact applied by the crankshaft of the compressor installed in the vehicle to the compression mechanism can be prevented. Thus, each part of the compression mechanism can be operated at a predetermined position, and the compression mechanism can efficiently compress a refrigerant. BRIEF DESCRIPTION OF DRAWINGS

[0014] The principles of the present application and its advantages will be more readily understood upon consideration of the following description, taken in conjunction with the accompanying drawings, in which:

[0015] Figure 1 is a schematic configuration view illustrating a compressor 1 including a stopper 40 according to an embodiment of the present application;

[0016] Figure 2 is an enlarged view of a lower portion of the compressor 1 in Figure 1 ;

[0017] Figure 3 is a view of a position between the crankshaft 36 and the compression mechanism 20;

[0018] Figure 4A is a perspective view as viewed from a bottom side of the stopper 40;

[0019] Figure 4B is a perspective view as viewed from an upper side of the stopper 40;

[0020] Figure 4C is a bottom view of the stopper 40; and

[0021] Figure 5 is an exploded perspective view of the crankshaft 36, the sub-frame 16, the stopper 40, etc. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and a description thereof will be appropriately omitted or simplified. Further, the shape, size, arrangement, and other factors of the components illustrated in the drawings can be appropriately changed without departing from the scope of the present application.

[0023] Figure 1is an explanatory diagram illustrating a schematic configuration of a scroll compressor 1 according to an embodiment. The compressor 1 is a fluid machine configured to compress and discharge a fluid (e.g., a gas refrigerant), and can be a component of a refrigeration cycle apparatus. The compressor 1 according to the present embodiment is a vertically installed shell type compressor 1, and is installed into a vehicle.

[0024] As shown in Figure 1 , the compressor 1 includes a container 10 as a sealed housing, a suction pipe 12 that is installed through to a top surface of the container 10 and formed as a hollow cylindrical pipe, a discharge pipe 14 that discharges a fluid to the outside, a scroll compression mechanism 20 configured to compress a fluid (low-pressure gas refrigerant) in a compression chamber 28, and a motor element 30 configured to drive the compression mechanism 20 housed in the container 10.

[0025] An upper portion of the compression mechanism 20 is supported by an intermediate housing 10a of the container 10. The compression mechanism 20 is fixed to the intermediate housing 10a of the container 10 by shrink fitting or other methods. A sub-frame 16 is provided below the motor element 30. The sub-frame 16 is fixed to an inner peripheral surface of the container 10. An oil sump 18 is formed on a bottom of the container 10. Refrigerant oil that lubricates sliding parts such as bearings is accumulated in the oil sump 18.

[0026] The suction pipe 12 configured to suck a fluid (low-pressure gas refrigerant) from the outside into the compression mechanism 20 is connected to a top surface of the container 10. The discharge pipe 14 configured to discharge a fluid (high-pressure gas refrigerant) to the outside of the compressor 1 is connected to a side surface of the container 10.

[0027] The compression mechanism 20 is housed in the container 10, and is configured to compress refrigerant sucked from the suction pipe 12 by rotation of a crankshaft 36 that is rotated by the motor element 30. As shown in Figure 1 , the compression mechanism 20 includes a fixed scroll 22 and an orbiting scroll 26.

[0028] The fixed scroll 22 is fixed to the intermediate housing 10a at a lower end portion of the fixed scroll 22. The fixed scroll 22 includes a base plate 22a and a first scroll body 22b having an involute shape and standing on one surface of the base plate 22a. A discharge port 24 configured to discharge compressed fluid is formed in a central portion of the fixed scroll 22.

[0029] The orbiting scroll 26 is configured to orbit without rotating relative to the fixed scroll 22 by an Oldham mechanism not shown. The orbiting scroll 26 includes a base plate 26a and a second scroll body 26b having a involute shape and erected on one surface of the base plate 26a. In a substantially central portion on a lower surface of the base plate 26a, an orbiting bearing 26c is formed in a cylindrical shape with a bottom. In order to orbit the orbiting scroll 26, an eccentric shaft portion 36b is inserted in the orbiting bearing 26c, which is mounted on an upper end portion of a main shaft portion 36a described later.

[0030] The second scroll body 26b is configured to engage with the first scroll body 22b to form compression chambers 28 between the first scroll body 22b and the second scroll body 26b. The orbiting scroll 26 is configured to orbit relative to the fixed scroll 22.

[0031] The motor element 30 includes an electric motor stator 32 fixed to an inner peripheral surface of the container 10 by shrinkage fitting or other methods, an electric motor rotor 34 rotatably housed on an inner peripheral side of the electric motor stator 32, and a crankshaft 36 (main shaft portion 36a) fixed to the electric motor rotor 34 by shrinkage fitting or other methods. The electric motor stator 32 is connected to glass terminals 38 via wires. The electric motor stator 32 is supplied with electric power from the outside via the glass terminals 38 and the wires. The electric motor rotor 34 is configured to rotate when electric power is supplied to the electric motor stator 32, and transmit driving force to the orbiting scroll 26 through the crankshaft 36.

[0032] The eccentric shaft portion 36b in the crankshaft 36 above the electric motor rotor 34 is rotatably supported in the radial direction by the cylindrical orbiting bearing 26c mounted below the base plate 26a. The main shaft portion 36a is fitted in the main bearing 39 and slides along the main bearing 39 by an oil film of lubricating oil. The eccentric shaft portion 36b eccentric with respect to the main shaft portion 36a is mounted on an upper end portion of the crankshaft 36.

[0033] A portion of the crankshaft 36 below the electric motor rotor 34 is rotatably supported by the sub-frame 16. On the crankshaft 36, an annular mounting concave groove 36c is provided at a position below a height position corresponding to the sub-frame 16. The annular mounting concave groove 36c is formed in a U shape having a section opening to the intermediate housing 10a of the container 10, and includes a lower wall surface 36cl and an upper wall surface 36c2 in a depth direction of the annular mounting concave groove 36. The annular mounting concave groove 36c is formed on an outer peripheral surface of the crankshaft 36.

[0034] A pump element 19, such as a positive displacement pump, is installed at the lower end of the crankshaft 36. The pump element 19 supplies refrigerant oil accumulated in the oil sump 18 to sliding parts, such as the main bearing 39. The pump element 19 is mounted on the subframe 16, and the crankshaft 36 is axially supported on the upper end surface of the pump element 19.

[0035] An oil supply passage 36d is formed in the crankshaft 36 along its axial direction. Figure 3 (Indicated by dashed lines). During the operation of compressor 1, lubricating oil stored in oil tank 18 of container 10 is supplied to compression mechanism 20 through oil supply passage to lubricate compression mechanism 20.

[0036] If passed Figure 3 As indicated by the arrow, after the lubricating oil passes through the oil supply channel 36d, it is supplied to the gap between the rotating bearing 26c and the eccentric shaft portion 36b of the compression mechanism 20. The lubricating oil then flows around the rotating bearing 26c and is supplied to the compression mechanism 20 and sliding parts, such as the main bearing 39.

[0037] like Figure 1 and Figure 2 As shown, a stop 40 is installed below the subframe 16, which is fixed to the inner circumferential surface of the container 10, to effectively utilize the limited space inside the compressor 1. When the stop 40 is installed below the subframe 16, the inner edge portion of the stop 40 surrounding the through hole 46 is fitted between the lower wall surface 36c1 and the upper wall surface 36c2.

[0038] like Figure 4A , Figure 4B and Figure 4C As shown, the stop member 40 is a plate-shaped member including a first plane 40a and a second plane 40b. The stop member 40 includes a first stop member 42 and a second stop member 44. Furthermore, the stop member 40 includes a through hole 46 formed between the first stop member 42 and the second stop member 44 and penetrating from the first plane 40a to the second plane 40b. Because the stop member 40 includes two members (i.e., the first stop member 42 and the second stop member 44), the stop member 40 can be mounted around the crankshaft 36.

[0039] The first stop member 42 and the second stop member 44 include end faces 42a and 44a, which are formed to abut against each other when the stop member 40 is mounted around the crankshaft 36, so that the abutment area between the stop member 40 and the wall surface of the annular mounting recess 36c of the crankshaft 36 can be larger.

[0040] When the stopper 40 is mounted around the crankshaft 36, the crankshaft 36 is inserted into the through-hole 46 of the stopper 40, and the stopper 40 is engaged and fixed on the annular mounting recessed groove 36c.

[0041] Further, the area of the bottom surface 42b of the first stopper member 42 is larger than the area of the bottom surface 44b of the second stopper member 44. A recessed portion 48 is formed around the through-hole 46 in the bottom surface 44b of the second stopper member 44. The recessed portion 48 is a recess formed in an arc shape when viewed from below the second stopper member 44, and has a stepped cross-section.

[0042] The width of the recessed portion 48 in the radial direction from the through-hole 46 is larger than the depth of the annular mounting recessed groove 36c.

[0043] Next, the mounting structure of the stopper 40 will be described with reference to Figure 5 The mounting structure of the stopper 40 will be described in detail. Figure 5 is an exploded perspective view of the crankshaft 36, the sub-frame 16, the stopper 40, and the like.

[0044] As shown in Figure 5 The sub-frame 16, the stopper 40, the thrust retainer 50, the thrust plate 52, the oil pipe assembly 54, the shaft cover 55, the baffle 57, and the pump strainer assembly 58 are attached to the lower portion of the crankshaft 36 in this order.

[0045] The thrust retainer 50 is a cylindrical member into which the crankshaft 36 is inserted and for retaining the crankshaft 36. The stopper 40 is pressed against the sub-frame 16 from below by the thrust retainer 50 and is fixed by the screw 51 as a fastening member.

[0046] The thrust plate 52 is formed in a plate shape and is in sliding contact with the crankshaft 36 to receive the thrust of the crankshaft 36. A thrust plate opening 53 is formed in the central portion of the thrust plate 52 so that oil can be supplied to the oil supply passage 36d of the crankshaft 36.

[0047] The oil pipe assembly 54 and the shaft cover 55 are attached to the lower surface of the thrust plate 52 in this order. The oil pipe assembly 54 for supplying oil to the thrust plate opening 53 is composed of a plate member that makes the oil pipe assembly 54 more easily attachable to the thrust plate 52 and a cylindrical oil pipe that penetrates the plate member. The shaft cover 55 is a cylindrical member formed so that the oil pipe assembly 54 can be inserted and so that the thrust plate 52, the oil pipe assembly 54, and the shaft cover 55 can be attached to the bottom surface of the thrust retainer 50 in this order by the screw 56.

[0048] The pump strainer assembly 58 is formed in a substantially cylindrical shape having a bottom, and is formed of a metal mesh, so that oil accumulated in the oil pan 18 is sucked into the pump strainer assembly 58. The pump strainer assembly 58 is fixed to the sub-frame 16 together with the baffle 57 by screws 59. When the pump strainer assembly 58 is fixed to the sub-frame 16 together with the baffle 57, the thrust retainer 50, the thrust plate 52, the oil pipe assembly 54, and the shaft cover 55 are accommodated in the pump strainer assembly 58.

[0049] Next, the operation of the stopper 40 will be described in detail with reference to Figure 1 to Fig. 4.

[0050] (Case where the vehicle is not driven)

[0051] Even if the compressor 1 is installed in the vehicle, in the case where the vehicle is not driven, a large force is not applied to the crankshaft 36 to displace the crankshaft 36 in the up-and-down direction. In this way, the crankshaft 36 does not collide with the compression mechanism 20, and the fixed scroll 22 and the orbiting scroll 26 operate at predetermined positions in the compression mechanism 20, respectively. Therefore, no undesirable friction occurs between the fixed scroll 22 and the orbiting scroll 26 and the compressor 1 operates at a desired efficiency.

[0052] (Case where the vehicle is driven)

[0053] On the other hand, even if the compressor 1 is installed in the vehicle, in the case where the vehicle is driven, a large force is applied to the crankshaft 36 to displace the crankshaft 36 in the up-and-down direction.

[0054] The crankshaft 36 is inserted into the through-hole 46 of the stopper 40, and the stopper 40 is engaged and fixed on the annular mounting recessed groove 36c. In this way, even if a large force acting to displace the crankshaft 36 in the up-and-down direction is applied to the crankshaft 36, the crankshaft 36 can be prevented from being displaced in the up-and-down direction.

[0055] Further, the area of the bottom surface 42b of the first stopper member 42 is larger than the area of the bottom surface 44b of the second stopper member 44, and a recessed portion 48 is formed around the through-hole 46 in the bottom surface 44b of the second stopper member 44.

[0056] In the case where the first stopper member 42 is installed at a position not higher than the second stopper member 44, the lower wall surface 36cl of the annular mounting recessed groove 36c is in contact with the bottom surface 42b of the first stopper member 42.

[0057] On the other hand, in the case where the first stopper member 42 is installed at a higher position than the second stopper member 44, since the recessed portion 48 is formed around the through-hole 46 in the bottom surface 44b of the second stopper member 44, the lower wall surface 36cl of the annular mounting recessed groove 36c can be moved upward until the lower wall surface 36cl of the annular mounting recessed groove 36c comes into contact with the bottom surface 42b of the first stopper member 42.

[0058] Thus, even if a large force acting to displace the crankshaft 36 in the up-and-down direction is applied to the crankshaft 36, the displacement of the crankshaft 36 in the up-and-down direction can be positively prevented, and the impact of the crankshaft 36 of the compressor 1 on the compression mechanism 20 can be positively prevented.

[0059] Further, the first stopper member 42 and the second stopper member 44 include end faces 42a, 44a which are formed to abut against each other when the stopper 40 is installed to surround the crankshaft 36. Thus, the abutment area between the stopper 40 and the lower wall surface 36cl of the annular mounting recessed groove 36c of the crankshaft 36 can be increased. Therefore, the impact of the crankshaft 36 of the compressor 1 on the compression mechanism 20 can be more positively prevented.

[0060] Therefore, when the vehicle is driven, the impact of the crankshaft 36 of the compressor 1 installed in the vehicle on the compression mechanism 20 can be prevented. Thus, each part of the compression mechanism 20 can be operated at a predetermined position, and the compression mechanism 20 can efficiently compress the refrigerant.

[0061] In addition, the gap between the orbiting bearing 26c of the compression mechanism 20 and the eccentric shaft portion 36b can be maintained at a predetermined distance. Therefore, even if the vehicle is not driven, the unwanted friction between the fixed scroll 22 and the orbiting scroll 26 does not occur, and the compressor 1 operates at a desired efficiency.

[0062] Although a specific embodiment of the present application has been disclosed and described and illustrated in the accompanying drawings, this is by way of example only and therefore modifications and alterations to the various structures described and illustrated herein, such as the design or material of the present application, the mounting mechanism or embodiment of various parts and elements, are possible and obvious to those skilled in the art in light of the principles of the present application, without departing from the scope and spirit of the teaching of the present application. The scope of the present application is defined by the appended claims.

[0063] List of Reference Signs

[0064] 1: Compressor

[0065] 10: Container

[0066] 10a: Intermediate housing

[0067] 12: suction pipe

[0068] 14: discharge pipe

[0069] 16: sub-frame

[0070] 18: oil sump

[0071] 19: pump element

[0072] 20: compression mechanism

[0073] 22: fixed scroll

[0074] 22a: base plate

[0075] 22b: first scroll body

[0076] 24: discharge port

[0077] 26: orbiting scroll

[0078] 26a: base plate

[0079] 26b: second scroll body

[0080] 26c: orbiting bearing

[0081] 28: compression chamber

[0082] 30: motor element

[0083] 32: electric motor stator

[0084] 34: electric motor rotor

[0085] 36: crankshaft

[0086] 36a: main shaft portion

[0087] 36b: eccentric shaft portion

[0088] 36c: annular mounting concave groove

[0089] 36c1: lower wall surface

[0090] 36c2: upper wall surface

[0091] 36d: oil feed passage

[0092] 38: glass terminal

[0093] 39: main bearing

[0094] 40: stopper

[0095] 40a: first plane

[0096] 40b: second plane

[0097] 42: first stop member

[0098] 42a: end face

[0099] 42b: bottom surface

[0100] 44: second stop member

[0101] 44a: end face

[0102] 44b: bottom surface

[0103] 46: through hole

[0104] 48: recessed portion

[0105] 50: thrust retainer

[0106] 51: screw

[0107] 52: thrust plate

[0108] 53: thrust plate opening

[0109] 54: tubing assembly

[0110] 55: shaft cover

[0111] 56: screw

[0112] 57: baffle

[0113] 58: pump screen assembly

[0114] 59: screw

Claims

1. A scroll compressor (1) comprising: a container (10); a crankshaft (36) housed in the container (10), the crankshaft (36) including a main shaft portion (36a), an eccentric shaft portion (36b) mounted on an end portion of the main shaft portion (36a), and an annular mounting concave groove (36c) formed on an outer peripheral surface of the crankshaft (36); a compression mechanism (20) including a fixed scroll (22) and an orbiting scroll (26), the compression mechanism (20) being housed in the container (10), disposed above the crankshaft (36), and configured to compress a refrigerant drawn in from the outside by rotation of the crankshaft (36); and a stopper (40) which is a plate-like member including a first plane (40a) and a second plane (40b), includes a first stopper member (42) and a second stopper member (44), and includes a through-hole (46) formed between the first stopper member (42) and the second stopper member (44) and penetrating from the first plane (40a) to the second plane (40b); wherein the orbiting scroll (26) includes a base plate (26a), a scroll body (26b), and an orbiting bearing (26c) formed in a bottomed cylindrical shape in a substantially central portion on a lower surface of the base plate (26a); wherein the eccentric shaft portion (36b) is inserted into the orbiting bearing (26c); wherein the crankshaft (36) is inserted into the through-hole (46) of the stopper (40), and the stopper (40) is engaged with and fixed on the annular mounting concave groove (36c); and wherein a recessed portion (48) is formed in a bottom surface (44b) of the second stopper member (44) around the through-hole (46).

2. The scroll compressor (1) of claim 1, wherein, An area of a bottom surface (42b) of the first stopper member (42) is greater than an area of the bottom surface (44b) of the second stopper member (44).

3. The scroll compressor (1) of claim 1, wherein, The stopper (40) is mounted below a sub-frame (16) fixed to an inner peripheral surface of the container (10).

4. The scroll compressor (1) of claim 1, wherein, The first stopper member (42) and the second stopper member (44) include end faces (42a, 44a) formed to abut against each other when the stopper (40) is mounted to surround the crankshaft (36).

5. The scroll compressor (1) of claim 1, wherein, A width of the recessed portion (48) from the through-hole (46) in a radial direction is greater than a depth of the annular mounting concave groove (36c).

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