Water-injected scroll compressor

Abstract

Provided is a water-injected scroll compressor capable of preventing corrosion of a scroll body in the presence of lubricating water. A water-injected scroll compressor (1) is provided with: an orbiting scroll (30) in which a scroll-shaped orbiting wrap (32) is provided on the plate surface of an orbiting-side base plate portion (31); a fixed scroll (50, 150) in which a scroll-shaped fixed wrap (52) that meshes with the orbiting wrap is provided on the plate surface of a fixed-side base plate portion (51); a tip seal (34, 54) that is housed in a groove portion (36, 56) formed along the tooth tip surfaces (39, 59) of the orbiting wrap and the fixed wrap; a bottom plate (40) that is mounted to the fixed-side base plate portion in a manner that at least includes a sliding region (Z1) of the tip seal; and a scroll-shaped bottom plate (40) that is mounted to the orbiting-side base plate portion in a manner that at least includes a sliding region (Z2) of the tip seal. The orbiting scroll and the fixed scroll have a resin coating (100) formed on the surfaces thereof.

Description

Technical Field

[0001] This invention relates to a water-addition scroll compressor. Background Technology

[0002] Previously, water-addition scroll compressors with a rotary scroll and a fixed scroll were known. For example, Patent Document 1 describes a technology that achieves weight reduction by using castings of aluminum alloys (Al-Si-Mg-Mn series, etc.) to form the rotary scroll and the fixed scroll.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-44731 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The lubricating water supplied to the compression chamber is easily made weakly acidic due to the dissolution of carbon dioxide gas in the air. Therefore, in order to improve the corrosion resistance of scroll plates such as rotary scroll plates and fixed scroll plates, a hard anti-corrosion aluminum film was formed on the surface of the raw materials. By forming a hard anti-corrosion aluminum film on the surface of the raw materials, it is also expected to improve the wear resistance of the scroll plate.

[0008] However, for hard corrosion-resistant aluminum coatings, the more complex the shape of the vortex body, the more difficult it is to form a coating with uniform thickness and homogeneous structure. Therefore, when defects such as thin film defects or structural flaws occur in the hard corrosion-resistant aluminum coating, the coating peels off due to corrosion (erosion) caused by lubricating water, resulting in corrosion on the exposed parts of the aluminum alloy.

[0009] The present invention was made in view of the above-mentioned problems, and its object is to provide a water-addition scroll compressor that can prevent corrosion of the scroll body in the presence of lubricating water.

[0010] Solution for solving the problem

[0011] This invention relates to a water-addition scroll compressor, comprising: a swirling scroll having a vortex-shaped swirling plate disposed on a plate surface of a swirling-side base plate; a fixed scroll having a vortex-shaped fixed plate engaged with the swirling plate disposed on a plate surface of a fixed-side base plate; an impeller seal received in a groove formed along the tooth tip surface of at least one of the swirling plate and the fixed plate; and a vortex-shaped base plate mounted on either the swirling-side base plate or the fixed-side base plate in such a manner that it includes at least a sliding area of ​​the impeller seal, wherein the swirling scroll and the fixed scroll are formed of aluminum alloy, and a resin coating is formed on the surfaces of the swirling scroll and the fixed scroll.

[0012] Preferably, the base plate is received in a groove formed along the tooth bottom surface of at least one of the rotary coil and the fixed coil, and the starting end of the winding and the ending end of the winding of the base plate are bolted to the rotary side base plate or the fixed side base plate.

[0013] Preferably, the water-addition scroll compressor includes: a first sealing ring through which the shaft portion of the bolt at its base end passes and is clamped between the head of the bolt and the base plate; and a second sealing ring through which the shaft portion of the bolt at its front end passes and is clamped between the base plate and the rotating side base plate portion or between the base plate and the fixed side base plate portion.

[0014] Preferably, the resin film is a coating formed on the ground surface of the aluminum alloy.

[0015] Preferably, the resin film formed on the vortex disk is formed from a sliding member composition comprising an adhesive resin and a solid lubricant but not containing conductive substances.

[0016] Preferably, the blade end seal is an insulating resin molded product.

[0017] Invention Effects

[0018] According to the present invention, a water-addition scroll compressor capable of preventing corrosion of the scroll body in the presence of lubricating water can be provided. Attached Figure Description

[0019] Figure 1 This is a perspective view of a water-addition scroll compressor according to an embodiment of the present invention.

[0020] Figure 2 This is an exploded perspective view of the housing of the water-addition scroll compressor of this embodiment.

[0021] Figure 3 This is a longitudinal sectional view of the water-addition scroll compressor of this embodiment.

[0022] Figure 4 This is a front view of the fixed scroll plate of the water-addition scroll compressor of this embodiment.

[0023] Figure 5 This is a front view of the base plate of the water-addition scroll compressor of this embodiment.

[0024] Figure 6 This is an enlarged longitudinal sectional view schematically showing the fixed scroll plate with the base plate mounted in this embodiment.

[0025] Figure 7This is an enlarged cross-sectional view schematically showing the position of the fastening bolts in the base plate of this embodiment.

[0026] Figure 8 This is a front view of the rotary scroll of the water-addition scroll compressor of this embodiment.

[0027] Figure 9 This is an enlarged longitudinal sectional view schematically showing the state in which the vortex disk in this embodiment is mounted with a base plate.

[0028] Figure 10 This is an enlarged cross-sectional view schematically showing the position of the fastening bolts in the base plate of this embodiment.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Water-addition scroll compressor

[0031] 30 Cyclone Scroll

[0032] 31 Rotary side substrate portion

[0033] 32 Rotary Coil Plate

[0034] 34 Blade end seal

[0035] 36. Groove

[0036] 37 Tooth Root Surface

[0037] 38. Groove

[0038] 39 Tooth tip

[0039] 40 base plate

[0040] 45-48 bolts

[0041] 450 shaft section

[0042] 451 Head

[0043] 5. 150 Fixed Scroll

[0044] 51 Fixed side substrate section

[0045] 52 Fixed Roll Plate

[0046] 54 Blade end seal

[0047] 56. Groove

[0048] 57 Tooth Root Surface

[0049] 58. Groove section

[0050] 59 Tooth tip

[0051] 100 Resin Coating

[0052] 101 First sealing ring

[0053] 102 Second sealing ring

[0054] 103 Grinding surface

[0055] Z1 and Z2 are sliding regions. Detailed Implementation

[0056] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0057] <Overall Structure of a Scroll Compressor>

[0058] Figure 1 This is a perspective view of a water-addition scroll compressor 1 according to an embodiment of the present invention. Figure 2 This is an exploded perspective view of the housing 10 of the water-addition scroll compressor 1 of this embodiment. Figure 3 This is a longitudinal sectional view of the water-addition scroll compressor 1 of this embodiment.

[0059] The water-adding scroll compressor 1 is a compressor that adds lubricating water to the acquired air and is driven by an externally supplied driving force. The water-adding scroll compressor 1 includes a housing 10, a rotating scroll 30, a crankshaft 70, a fixed scroll 50, and a fixed scroll 150.

[0060] The housing 10 is composed of a first housing portion 15 and a second housing portion 20. A fixed scroll 50 is mounted at the opening 16 formed in the first housing portion 15. The fixed scroll 50 is mounted at the opening 21 formed in the second housing portion 20. It should be noted that... Figure 2 The diagram of the fixed vortex plate 50 is omitted.

[0061] The vortex disk 30 is housed inside the housing 10 with its center of rotation located in the center. In this embodiment, the vortex disk 30 is held by the housing 10 with its axial direction oriented laterally (horizontally). Multiple crankshafts 70 are connected to the vortex disk 30.

[0062] The crankshaft 70 includes an eccentric shaft portion 71 and base shaft portions 72 disposed on both sides of the eccentric shaft portion 71. In this embodiment, a counterweight 75 is provided on the base shaft portion 72 to facilitate the rotational motion of the rotary scroll 30. The shape and weight of the counterweight 75 are appropriately adjusted according to the mounting position of the crankshaft 70. The eccentric shaft portion 71 is axially supported on the rotary scroll 30, and the base shaft portion 72 is axially supported on the housing bearing portion 26 of the housing 10.

[0063] Three crankshafts 70 are arranged at equal intervals in the circumferential direction. The three crankshafts 70 have the same structure and rotate synchronously under the action of a rotation synchronization mechanism formed by pulleys 76, timing belts 77, and tension rollers 78, with the positions of the eccentric shaft portions 71 aligned. When the crankshafts 70 rotate under the power of an external motor, the rotary scroll 30 rotates relative to the fixed scroll 50.

[0064] The fixed scroll plate 50 is disposed on one side of the axial direction of the rotary scroll plate 30, and the fixed scroll plate 150 is disposed on the other side of the axial direction of the rotary scroll plate 30. That is, the rotary scroll plate 30 is sandwiched between the fixed scroll plate 50 and the fixed scroll plate 150.

[0065] In this embodiment, air (fluid) with added lubricating water is introduced from the outside via piping (not shown) through the rotation of the rotary scroll 30. The air introduced into the compression chamber 90 of the water-adding scroll compressor 1 is compressed between the rotary scroll 30 and the fixed scrolls 50 and 150, while moving from the outer end to the inner end of its vortex and being discharged from the central opening 60.

[0066] <Fixed Scroll>

[0067] Next, the structure of the fixed vortex 50 will be described. Figure 4 This is a front view of the fixed scroll 50 of the water-addition scroll compressor of this embodiment.

[0068] The fixed scroll 50 includes a circular plate-shaped fixed side base plate portion 51, one or more fixed scroll plates 52 disposed on a plate surface (single side) opposite to the rotating side base plate portion 31 in the fixed side base plate portion 51, an annular outer peripheral scroll plate 55 surrounding the fixed scroll plates 52, and a base plate 40.

[0069] A central opening 60 extending through the thickness direction is formed in the center of the fixed-side substrate portion 51. The central opening 60 is a through hole that connects the outer side of the water-addition scroll compressor 1 to the compression chamber 90. In addition, an outer peripheral opening 61 is provided on the outer periphery of the fixed-side substrate portion 51.

[0070] The fixed coil plate 52 is formed in number, shape and size corresponding to the rotary coil plate 32 of the rotary swivel 30. The fixed coil plate 52 is formed by extending vertically (along the axial direction) from the plate surface of the fixed side base plate portion 51 and being bent in a spiral shape with an involute curve from the center portion of the fixed side base plate portion 51 toward the outer periphery.

[0071] An blade end seal 54 is provided at the front end of the fixed coil plate 52 to fill the gap between it and the swirling side base plate portion 31 of the swirling scroll 30. The blade end seal 54 is arranged along the vortex of the fixed coil plate 52.

[0072] The blade end seal 54 in this embodiment is an insulating resin molded product with polytetrafluoroethylene as the main component. The blade end seal 54 may also contain solid lubricants such as carbon fiber or graphite to improve its wear resistance without compromising its insulation properties.

[0073] The outer peripheral plate 55 is formed into a cylindrical shape that surrounds the fixed plate 52. The space surrounded by the rotating side base plate 31, the fixed side base plate 51 and the outer peripheral plate 55 functions as a compression chamber 90 for compressing air (fluid) with added water.

[0074] An outer peripheral seal 80 is provided at the front end of the outer peripheral plate 55 to fill the gap between it and the swirling side base plate portion 31 of the swirling scroll 30. The outer peripheral seal 80 is formed in an annular shape that surrounds the compression chamber 90 to prevent water leakage from the compression chamber 90 to the outside.

[0075] A notch 510 is provided on the inner circumferential surface of the outer peripheral plate 55. The notch 510 is located radially inside the outer peripheral seal 80 and is formed in an arc shape. A drain port 520 communicating with the outside of the compression chamber 90 is formed near the end 512 on one side of the notch 510. The drain port 520 opens on the end face of the notch 510 facing the rotating side base plate 31. The drain port 520 extends to the outer surface of the fixed side base plate 51, becoming a flow path for discharging water accumulated inside to the outside of the compression chamber 90.

[0076] The base plate 40 is mounted on the fixed side base plate portion 51 of the fixed vortex 50. Figure 5 This is a front view of the base plate 40 of the water-addition scroll compressor 1 in this embodiment.

[0077] like Figure 5 As shown, the base plate 40 is a metal plate formed by a spiral bend with an involute curve. The base plate 40 is preferably made of a corrosion-resistant metal. In this embodiment, the base plate 40 is made of stainless steel.

[0078] A starting end fastening hole 41 is formed at the beginning of winding on the center side of the vortex of the base plate 40. Additionally, an end end fastening hole 42 is formed at the end of winding on the outer side of the vortex of the base plate 40.

[0079] Figure 6 This is an enlarged longitudinal sectional view schematically showing the state in which the fixed scroll 50 is mounted with the base plate 40 in this embodiment. Figure 6 and Figure 3 The position of region A, which is enclosed by the dotted line, corresponds to this.

[0080] like Figure 6As shown, a receiving groove 58 for receiving the base plate 40 is formed in the area between the toothed wall surface 52a of the inner fixed roll plate 52 and the toothed wall surface 52b of the outer fixed roll plate 52, i.e., the tooth bottom surface 57. The receiving groove 58 is formed to extend in a spiral shape corresponding to the shape of the base plate 40, and the depth D1 of the receiving groove 58 is set to correspond to the thickness of the base plate 40.

[0081] Furthermore, the receiving groove 58 is formed to correspond to the sliding region Z1 of the rotating plate 32 of the rotating scroll 30, which will be described later. The blade end seal 34 is received in the groove 36 formed on the tooth top surface 39 of the rotating plate 32, and the sliding region Z1 is the area that at least includes the area where the blade end seal 34 contacts the fixed side base plate 51.

[0082] The base plate 40 is mounted on the fixed side base plate 51 in a state of being received in the receiving groove 58. For example... Figure 4 As shown, the starting end of the vortex of the base plate 40 is fixed by bolt 45, and the ending end is fixed by bolt 46. The starting end of the fastening bolt 45 of the base plate 40 is located near the central opening 60, and the ending end of the fastening bolt 46 is located near the outer peripheral opening 61.

[0083] Figure 7 This is an enlarged cross-sectional view schematically showing the position of the fastening bolts 45 (bolts 46) in the base plate 40 of this embodiment. (See attached image.) Figure 7 As shown, bolt 45 (bolt 46) has a shaft portion 450 through which the starting end side fastening hole 41 (ending end side fastening hole 42) of the base plate 40 is passed and fastened to the fixed side base plate portion 51, and a head 451 formed on the base end side of the shaft portion 450.

[0084] In this embodiment, a first sealing ring 101 is disposed between the head 451 and the base plate 40, and a second sealing ring 102 is disposed between the base plate 40 and the fixed side base plate portion 51.

[0085] The first sealing ring 101 is an annular elastic member that contacts both the head 451 and the base plate 40 and surrounds the shaft portion 450.

[0086] The second sealing ring 102 is an annular elastic member that contacts both the base plate 40 and the fixed-side substrate portion 51, and surrounds the shaft portion 450. In this embodiment, a resin film 100 is formed on the surface of the fixed scroll 50, so that the second sealing ring 102 contacts the fixed-side substrate portion 51 via the resin film 100. It should be noted that the structure of the resin film 100 will be described later.

[0087] Fixed scroll plate 50 and fixed scroll plate 150 are identical in structure, except that they are mirror images of each other along a line symmetrical about a predetermined axis of symmetry, such as the vertical direction. In the structure of fixed scroll plate 150, the same reference numerals are used to denote structures common to or identical to those in fixed scroll plate 50.

[0088] The fixed scroll 150 also includes a circular plate-shaped fixed side base plate portion 51, a fixed roll plate 52 disposed in the fixed side base plate portion 51 opposite to the rotating side base plate portion 31 on a plate surface (single side), an annular outer peripheral roll plate 55 surrounding the fixed roll plate 52, and a base plate 40.

[0089] The base plate 40 of the fixed scroll 150 is installed in a flipped state, which is the same shape as the base plate 40 of the fixed scroll 50. That is, by utilizing the above-described mirror relationship, the base plates 40 that are fixed to the fixed scroll 50 and the fixed scroll 150 respectively can use components of the same shape.

[0090] <Rotating Vortex>

[0091] Next, the structure of the swirling scroll 30 will be described. The swirling scroll 30 includes a circular plate-shaped swirling side base plate 31, swirling spiral plates 32 respectively disposed on both sides of the swirling side base plate 31, a swirling scroll outer periphery 35, and a base plate 40 respectively disposed on both sides of the swirling side base plate 31.

[0092] The spiral plate 32 is configured to extend vertically (along the axial direction) from the plate surface of the spiral side base plate portion 31 and to be a spiral-shaped plate with an involute curve from the center of the spiral side base plate portion 31 toward the outer periphery. The spiral plates 32 on both sides are of corresponding shapes.

[0093] A blade tip seal 34 is provided at the front end of each rotary coil 32 to fill the gap between it and the fixed side base plate portion 51 of the fixed volute 50. The blade tip seal 34 is arranged along the vortex of the rotary coil 32.

[0094] The blade end seal 34 in this embodiment is an insulating resin molded product with polytetrafluoroethylene as the main component. The blade end seal 54 may also contain solid lubricants such as carbon fiber or graphite to improve its wear resistance without compromising its insulation properties.

[0095] The outer periphery 35 of the vortex disk is formed into a generally triangular frame that surrounds the vortex-side base plate portion 31, with the vortex-side base plate portion 31 located inside it. In this embodiment, the outer periphery 35 of the vortex disk and the vortex-side base plate portion 31 are integrally formed, and connection holes 301 for connecting to the crankshaft 70 are formed at positions corresponding to the apex (corner) of the generally triangular shape of the outer periphery 35 of the vortex disk.

[0096] Figure 9This is an enlarged longitudinal sectional view schematically showing the state in which the vortex disk 30 is mounted with the base plate 40 in this embodiment. Figure 9 and Figure 3 The position of region B, which is enclosed by the dotted line, corresponds to this.

[0097] like Figure 9 As shown, a receiving groove 38 for receiving the base plate 40 is formed in the area between the tooth wall surface 32a of the inner rotary plate 32 and the tooth wall surface 32b of the outer rotary plate 32, i.e., the tooth bottom surface 37. The receiving groove 38 is formed to extend in a spiral shape corresponding to the shape of the base plate 40, and the depth D2 of the receiving groove 38 is set to correspond to the thickness of the base plate 40.

[0098] Furthermore, the receiving groove 38 is formed to correspond to the sliding area Z2 of the fixed scroll plate 52 of the fixed scroll 50 or the fixed scroll 150. The blade end seal 54 is received in the groove 56 formed on the tooth top surface 59 of the fixed scroll plate 52, and the sliding area Z2 is the area that includes at least the contact range between the blade end seal 54 and the swivel side base plate 31.

[0099] The base plate 40 is mounted on both sides of the rotating side base plate 31 in a state of being received in the receiving groove 38. The base plate 40 fixed to the rotating side base plate 31 is a base plate with the same shape as the base plate 40 fixed to the fixed side base plate 51. In this embodiment, the base plate 40 fixed to the fixed side base plate 51 facing the rotating side base plate 31 in a flipped state is mounted on the rotating side base plate 31.

[0100] That is, not only the fixed scroll 150, but also the two base plates 40 mounted on the rotary scroll 30 have the same shape as the base plate 40 mounted on the fixed scroll 50. Thus, in this embodiment, the two base plates 40 disposed on one side of each of the fixed scroll 50 and the fixed scroll 150, and the two base plates 40 disposed on both sides of the rotary scroll 30, can all use base plates of the same shape.

[0101] like Figure 8 As shown, the starting end of the vortex of the base plate 40 is fixed by bolt 47, and the ending end of the vortex is fixed by bolt 48. The starting end of the vortex of the base plate 40 is located near the central opening 33.

[0102] Figure 10 This is an enlarged cross-sectional view schematically showing the position of the fastening bolts 47 (bolts 48) in the base plate 40 of this embodiment. (See attached image.) Figure 10 As shown, a first sealing ring 101 is disposed between the head 451 of bolt 47 (bolt 48) and the base plate 40, and a second sealing ring 102 is disposed between the base plate 40 and the rotating side base plate portion 31.

[0103] The first sealing ring 101 is an annular elastic member that contacts both the head 451 and the base plate 40, and surrounds the shaft portion 450. The second sealing ring 102 is an annular elastic member that contacts both the base plate 40 and the swivel-side base plate portion 31, and surrounds the shaft portion 450. A resin film 100 is also formed on the surface of the swivel scroll 30, so that the second sealing ring 102 contacts the swivel-side base plate portion 31 through the resin film 100.

[0104] <Resin Coating>

[0105] Next, the resin coating 100 will be described. As described above, the resin coating 100 is formed on the surfaces of the fixed scroll 50 and the fixed scroll 150 (see reference). Figure 7 Furthermore, a resin film 100 is also formed on the surface of the vortex disk 30 (see reference). Figure 10 ).

[0106] The resin coating 100 is a film applied to the surface of the raw material, unlike conventional hard anti-corrosion aluminum films, which modify the surface of the raw material through chemical changes such as oxidation. In this embodiment, the resin coating 100 uses a sliding component composition containing an adhesive resin and a solid lubricant, but without conductive substances, as the resin material.

[0107] The composition of the resin coating 100 is illustrated. The resin coating 100 is, for example, composed of a sliding member composition comprising a binder resin 100 by weight, a solid lubricant by weight of 5 to 100 by weight, and a filler by weight of 20 to 40 by weight.

[0108] Adhesive resins, for example, can be polyamide-imide resins, polyamide resins, polyimide resins, epoxy resins, or phenolic resins. Solid lubricants, for example, can be fluorinated polymers such as polytetrafluoroethylene (PTFE) and tetrafluoroethylene perfluoro(alkyl vinyl ether) copolymers. Fillers, for example, can be materials with a layered structure such as calcined kaolin, dry kaolin, or mica, and whose oil absorption is 40–100 ml / 100 g. It should be noted that the oil absorption shown in this example is based on the oil absorption measured according to ASTM standard D281-12 (2016).

[0109] Furthermore, the resin coating 100 of this embodiment is formed by coating the surface of the sandblasted aluminum alloy. During the sandblasting process, abrasive material is projected onto the rotating volute 30, fixed volute 50, and 150 of the aluminum alloy, forming a grinding surface 103 (see reference). Figure 7 as well as Figure 10The ground surface 103 is coated to form a resin film 100. Due to the increased surface area caused by sandblasting, the resin film 100 achieves a high degree of adhesion to the rotary scroll 30, fixed scroll 50, and 150 by utilizing the anchoring effect.

[0110] It should be noted that, in this embodiment, an example of using a resin film 100 of the same composition between the rotary scroll 30 and the fixed scrolls 50 and 150 is described, but the embodiment is not limited to this example. For example, the durability of the resin film 100 of the rotary scroll 30 becomes important because there is sliding contact with the outer peripheral seals 80 of the fixed scrolls 50 and 150, but since there is only sliding contact with the blade end seals 34 on the side of the fixed scrolls 50 and 150, a resin film with a different composition than the resin film 100 of the rotary scroll 30 can also be formed to save costs.

[0111] As described above, the water-addition scroll compressor 1 of this embodiment includes: a swirling scroll 30, which has a vortex-shaped swirling plate 32 provided on the plate surface of the swirling side base plate 31; fixed scrolls 50 and 150, which have vortex-shaped fixed plates 52 that engage with the swirling plate 32 on the plate surface of the fixed side base plate 51; blade end seals 34 and 54, which are received in grooves 36 and 56 formed along the tooth top surfaces 39 and 59 of at least one of the swirling plate 32 and the fixed plate 52; a base plate 40, which is mounted on the fixed side base plate 51 in such a way that it includes at least a sliding area Z1 of the blade end seal 34; and a vortex-shaped base plate 40, which is mounted on the swirling side base plate 31 in such a way that it includes at least a sliding area Z2 of the blade end seal 54. The swirling scroll 30 and the fixed scrolls 50 and 150 are formed of aluminum alloy, and a resin coating 100 is formed on the surface of the swirling scroll 30 and the fixed scrolls 50 and 150.

[0112] In this way, instead of the conventional hard anti-corrosion aluminum film formed on the surface of the scroll plate, a structure is adopted in which a resin coating 100 is formed on the surface of the scroll plate 30 and the fixed scroll plates 50 and 150. This allows for the inexpensive manufacture of the scroll plate 30 and the fixed scroll plates 50 and 150 with a protective coating having uniform film thickness and homogeneous structure. Furthermore, a base plate 40 is configured in the sliding area (sliding contact surface) Z1 of the blade end seal 34 in the tooth root surface 57 of the fixed plate 52, and also in the sliding area (sliding contact surface) Z2 of the blade end seal 54 in the tooth root surface 37 of the scroll plate 32. This prevents wear and peeling of the resin coating 100. In particular, by using a corrosion-resistant metal (e.g., stainless steel) in the base plate 40, wear and peeling of the resin coating 100 can be prevented, and corrosion of the aluminum alloy based on lubricating water can be reliably prevented.

[0113] In addition, the base plate 40 of this embodiment is housed in receiving grooves 38 and 58 formed along the toothed bottom surfaces 37 and 57 of at least one of the rotary coil plate 32 and the fixed coil plate 52, and the starting end of the winding and the ending end of the winding of the base plate 40 are fixed with bolts 45 to 48 relative to the rotary side base plate 31 or the fixed side base plate 51.

[0114] By configuring the base plate 40 to be housed in the receiving grooves 38 and 58, and by bolting the beginning and end portions of the base plate 40 together, positional displacement of the blade end seals 34 and 54 during sliding contact is prevented. This reliably prevents wear and peeling of the resin coating 100.

[0115] In addition, the water-addition scroll compressor 1 of this embodiment includes: a first sealing ring 101 through which the shaft portion 450 of the base end side of the bolts 45 to 48 passes and is sandwiched between the head 451 of the bolts 45 to 48 and the base plate 40; and a second sealing ring 102 through which the shaft portion 450 of the front end side of the bolts 45 to 48 passes and is sandwiched between the base plate 40 and the rotating side base plate portion 31 or the base plate 40 and the fixed side base plate portion 51.

[0116] Thus, by configuring the first sealing ring 101 and the second sealing ring 102, lubricating water can be prevented from entering the shaft portion 450 of the bolts 45-48, thereby preventing dissimilar metal contact corrosion that occurs on the toothed wall surfaces 32a, 32b of the rotary coil 32 and the toothed wall surfaces 52a, 52b of the fixed coil 52. Furthermore, when the blade end seals 34, 54 slide, the base plate 40 becomes energized, potentially generating sparks that could damage the toothed wall surfaces 32a, 32b of the rotary coil 32 and the toothed wall surfaces 52a, 52b of the fixed coil 52. However, by using the bolts 45-48 to connect the base plate 40 to the rotary side base plate portion 31 or the fixed side base plate portion 51, the bolts 45-48 function as a grounding element. The energization of the base plate 40 is discharged through the housing 10, preventing the generation of sparks.

[0117] In addition, the resin film 100 in this embodiment is a coating formed on the grinding surface 103 of the aluminum alloy surface.

[0118] A resin film 100 is formed on the surface of the sandblasted aluminum alloy by coating, which improves the adhesion between the vortex 30 or the fixed vortex 50, 150 as the base material and the resin film 100.

[0119] In addition, in this embodiment, the resin film 100 formed on the vortex disk 30 is formed from a sliding member composition containing an adhesive resin and a solid lubricant but not a conductive substance.

[0120] For example, by forming a resin film 100 in a sliding member composition that includes a solid lubricant (e.g., polytetrafluoroethylene) in an adhesive resin (e.g., polyamide-imide resin), the wear resistance of the scroll body can be improved (particularly the wear resistance of the contact portions between the toothed surfaces 52a, 52b of the fixed scroll plate 52 and the toothed surfaces 32a, 32b of the rotary scroll plate 32, and the sliding surface of the outer peripheral seal 80). Furthermore, since this sliding member composition does not contain conductive materials such as graphite, it also helps prevent dissimilar metal contact corrosion that occurs in the grooves 36, 56 of the blade end seal due to the conduction between the base plate (stainless steel) and the target-side scroll plate (aluminum alloy) in the presence of lubricating water. In particular, the rotary scroll plate 30 has sliding contact with the outer peripheral seal 80 located at the front end of the outer peripheral scroll plate 55 of the fixed scroll plates 50, 150, requiring durability; therefore, the resin film 100 is preferably configured as described above.

[0121] In addition, the blade end seals 34 and 54 in this embodiment are insulating resin molded products.

[0122] For example, the blade end seals 34 and 54 are formed with self-lubricating polytetrafluoroethylene as the main component and include solid lubricants such as carbon fiber and graphite within a range that does not impede insulation. The use of solid lubricants provides excellent wear resistance and sealing performance. Furthermore, the selection of insulating components in the blade end seals 34 and 54 helps prevent dissimilar metal contact corrosion in the grooves 36 and 56 of the blade end seals 34 and 54 due to the conduction between the stainless steel base plate and the coated plate (aluminum alloy) on the opposite side in the presence of lubricating water.

[0123] The above description of this embodiment is not limited to the above embodiment and can be appropriately modified. For example, in the above embodiment, an example is shown where all the mounting base plates 40 of the swirling scroll 30 and the fixed scrolls 50 and 150 are mounted, but it is also possible to configure the base plate 40 in either the swirling scroll 30 or the fixed scrolls 50 and 150.

Claims

1. A water-addition scroll compressor, which is a water-addition scroll compressor for air compression, wherein, The water-addition scroll compressor has the following features: A swirling scroll, wherein a swirling spiral plate is provided on the surface of the base plate on the swirling side; A fixed scroll plate, wherein a vortex-shaped fixed scroll plate is provided on the plate surface of the fixed side base plate portion to engage with the rotary scroll plate; A blade end seal is received in a groove formed along the tooth tip surface of at least one of the rotary blade and the fixed blade; as well as A vortex-shaped base plate, made of corrosion-resistant metal, is mounted on the swirling side base plate or the fixed side base plate in a manner that includes at least a sliding area of ​​the blade end seal. The swirling scroll and the fixed scroll are formed of aluminum alloy, and a resin film is formed on the surface of the swirling scroll and the fixed scroll. This resin film is formed from a sliding member composition containing an adhesive resin and a solid lubricant but not containing conductive substances. The base plate is mounted on the surface of the resin coating.

2. The water-addition scroll compressor according to claim 1, wherein, The base plate is received in a groove formed along the tooth bottom surface of at least one of the rotary coil and the fixed coil, and the starting end of the winding and the ending end of the winding of the base plate are bolted to the rotary side base plate or the fixed side base plate.

3. The water-addition scroll compressor according to claim 2, wherein, The water-addition scroll compressor has the following features: A first sealing ring, which passes through the axial portion of the bolt on the base end side and is clamped between the bolt head and the base plate; and The second sealing ring is provided through the shaft portion of the front end of the bolt and is sandwiched between the base plate and the rotating side base plate portion or between the base plate and the fixed side base plate portion.

4. The water-addition scroll compressor according to any one of claims 1 to 3, wherein, The resin film is a coating formed on the ground surface of the aluminum alloy.

5. The water-addition scroll compressor according to any one of claims 1 to 3, wherein, The blade end seal is an insulating resin molded product.

Images