JP4615975B2 - Scroll type fluid machine - Google Patents

Description

  The present invention relates to a scroll fluid machine suitable for use in a compressor such as air or refrigerant, a vacuum pump, or the like.

  Generally, as a scroll type fluid machine, a scroll type air compressor having a configuration in which orbiting scrolls are provided on both sides in the axial direction of a rotary shaft and the rotary shaft is driven to compress air or the like at two locations on both sides. Is known (see, for example, Patent Document 1).

JP 2002-13492 A

  This type of prior art air compressor is provided with first and second fixed scrolls on both axial sides of a cylindrical casing, and these fixed scrolls have spiral wrap portions on the surface of the end plate, respectively. It is erected.

  Further, a rotating shaft composed of a cylindrical rod and an electric motor that rotationally drives the rotating shaft are provided in the casing. Then, on the inner peripheral side of the rotating shaft, a connecting shaft eccentric by a fixed dimension with respect to the central axis is rotatably inserted, and both ends of the connecting shaft protrude from both axial sides of the rotating shaft and rotate. The crank part is eccentric with respect to the shaft.

  These crank portions are connected to first and second orbiting scrolls each having a spiral lap portion standing on the surface of the end plate, and the wrap portions of the orbiting scrolls are respectively connected to the first and second orbiting scrolls. A plurality of compression chambers are defined by overlapping with the wrap portions of the fixed scroll.

  In this case, the end plate of each orbiting scroll is formed as a two-layered plate-like body in which a cooling air passage and a cooling fin are provided, and on the back side of the end plate, a metal attached to the connecting shaft is formed. A plate or the like is provided.

  During the operation of the air compressor, when the rotary shaft is driven to rotate by the electric motor, the first and second orbiting scrolls connected to both ends thereof orbit with respect to the respective fixed scrolls, and the first fixed Air compression operations are performed between the scroll and the orbiting scroll and between the second fixed scroll and the orbiting scroll, respectively.

  In this case, the end plates of the fixed scroll and the orbiting scroll become high temperature due to compression heat generated during the compression operation. For this reason, in the prior art, a cooling electric fan provided with an electric motor is provided in the vicinity of the outer periphery of each of the first and second fixed scrolls.

  During the operation of the air compressor, two electric fans are operated by supplying power from the outside, the first fixed scroll and the orbiting scroll are cooled on the back side by one electric fan, and the other electric fan is used. The back surfaces of the second fixed scroll and the orbiting scroll are cooled.

  By the way, in the prior art mentioned above, it is set as the structure which each provides an electrically driven electric fan in the outer peripheral side of the 1st, 2nd fixed scroll. However, in this case, since the two electric fans become a structure projecting in the radial direction at both ends of the air compressor, there is a problem that the entire compressor is enlarged in the radial direction.

  In addition, the installation of two electric fans not only makes it difficult to reduce the cost of the compressor, but also increases the noise, heat generation, power consumption, etc. of the entire compressor when each electric fan is activated, resulting in a commercial product. There is also a problem that it falls. Moreover, it is necessary to form, for example, a mounting portion for each electric fan in the compressor casing and fixed scroll, and to route the wiring for supplying power to the electric fan, which complicates the structure of the casing and fixed scroll. easy.

  In the prior art, the end plate has a two-layer structure in order to improve the cooling performance of the orbiting scroll, and a mounting plate attached to the connecting shaft is provided on the back side of the end plate. For this reason, the structure of the orbiting scroll becomes complicated, and there is a problem that work such as processing and assembly takes time and productivity is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to sufficiently cool a wide range on both sides in the axial direction of the casing, simplifying the cooling structure while ensuring high cooling performance. It is an object of the present invention to provide a scroll type fluid machine that can reduce the size of the entire machine and suppress noise and power consumption.

The invention of claim 1 to solve the above problems, a casing having a fan housing portion and the scroll accommodating portion, and a fixed scroll spiral wrap portion on the surface of the end plate provided on the casing is upright , an electric motor provided in the casing, a rotary shaft driven to rotate by the electric motor is supported by the casing, provided in the scroll accommodating section, an end plate coupled to the rotating shaft at a position facing the fixed scroll A scroll-type fluid machine provided with a orbiting scroll having a plurality of compression chambers overlapped with a wrap portion of the fixed scroll on a surface of the rotary scroll, wherein the rotating shaft accommodates a fan in the casing. a cooling fan which rotates together with said rotary shaft at a position the orbiting scroll opposed to portion provided, set in the scroll accommodating portion Is, suction cooling air from the outside, an inlet for guiding the cooling air to the cooling fan via the rear side of the end plate of the orbiting scroll is provided on a side surface of the fan housing portion, it sucked from the fluid inlet An outlet that allows the cooling air to flow out of the fan housing portion by the cooling fan, and a scroll duct that is provided outside the casing and guides the cooling air that has flowed out of the outlet to the back side of the end plate of the fixed scroll It has a configuration that Ru equipped with a door.

Further, in the invention of claim 2, a casing having a fan housing portion and the scroll accommodating portion, and a fixed scroll spiral wrap portion on the surface of the end plate provided on the casing is upright, it is provided in the casing An electric motor, a rotary shaft supported by the casing and driven to rotate by the motor, and the fixed scroll provided in the scroll housing portion and connected to the rotary shaft at a position facing the fixed scroll on the surface of the end plate In the scroll type fluid machine including the orbiting scroll provided with the wrap portion standing upright so as to overlap with the wrap portion, the rotating shaft has the orbiting scroll in the fan accommodating portion of the casing. a cooling fan which rotates together with said rotary shaft at a position opposite to provided, is provided in the fan housing section, the cooling air from the outside Inclusive, an inlet for guiding the cooling air to the cooling fan, and the provided on the side surface of the fan housing section, the outlet for flow out of the fan housing portion cooling air sucked from the fluid inlet by the cooling fan A scroll duct that is provided outside the casing and guides the cooling air flowing out from the outlet to the back side of the end plate of the fixed scroll, and a part of the cooling air flowing in the scroll duct is part of the orbiting scroll. A vent that circulates in a space formed on the back side of the end plate, and a cooler that cools the gas sucked into the compression chamber or the gas discharged from the compression chamber on the outside of the casing, Outflow ports are formed at two positions on the casing at positions different from the inlet, and the scroll duct is connected to one of the outlets, and the other outlet is connected. The mouth has a configuration that connects a cooler duct for guiding cooling air to the cooler.

Further, in the invention of claim 3, first, first and second fan housing section, casing and, spiral wrap on the surface of the end plate provided on both sides of the casing and a second scroll accommodating portion The first and second fixed scrolls , the motor being provided between the first and second fixed scrolls and provided in the casing, and supported by the casing and driven to rotate by the motor Provided in the first and second scroll accommodating portions, and connected to the rotary shaft at positions facing the first and second fixed scrolls, respectively, on the surface of the end plate. 2. A scroll fluid machine comprising first and second orbiting scrolls each provided with a wrap portion standing upright to overlap a lap portion of two fixed scrolls to define a plurality of compression chambers. Is provided with a first, second cooling fan which rotates together with the rotary shaft in the first, the the second fan housing portion first, facing respectively the second orbiting scroll position of the casing, the Cooling air is sucked from the outside provided in the first and second scroll accommodating portions, and the cooling air is passed through the back surfaces of the end plates of the first and second orbiting scrolls. first directing each fan, and the second inlet, the first, is provided on the side surface of the second fan housing portion, said first, said first cooling air sucked from the second inlet, the wherein the second cooling fan first, first, and second outlet port to flow out respectively to the outside of the second fan housing portion, provided on the outside of the casing, the outflow from the first, second outlet Back surface of the end plate of the first and second fixed scrolls First directing each has a configuration in which Ru and a second scroll duct.

Further, in the invention of claim 4, first, first and second fan housing section, casing and, spiral wrap on the surface of the end plate provided on both sides of the casing and a second scroll accommodating portion The first and second fixed scrolls , the motor being provided between the first and second fixed scrolls and provided in the casing, and supported by the casing and driven to rotate by the motor Provided in the first and second scroll accommodating portions, and connected to the rotary shaft at positions facing the first and second fixed scrolls, respectively, on the surface of the end plate. 2. A scroll fluid machine comprising first and second orbiting scrolls each provided with a wrap portion standing upright to overlap a lap portion of two fixed scrolls to define a plurality of compression chambers. Is provided with a first, second cooling fan which rotates together with the rotary shaft in the first, the the second fan housing portion first, facing respectively the second orbiting scroll position of the casing, the A first inlet that is provided in the first scroll housing portion, sucks cooling air from the outside, and guides the cooling air to the first cooling fan via the back surface side of the end plate of the first orbiting scroll; And a first outlet that is provided on a side surface of the first fan accommodating portion and causes the cooling air sucked from the first inlet to flow out of the first fan accommodating portion by the first cooling fan. And a first scroll duct that is provided outside the casing and guides the cooling air flowing out from the first outlet to the back side of the end plate of the first fixed scroll, and the second fan provided in the housing portion, or an external The cooling air suction, the second inlet for guiding the cooling air to the second cooling fan, provided on the side of the second fan housing portion, the cooling air sucked from the second inlet A second outlet that allows the second cooling fan to flow out of the second fan housing portion and a cooling air that is provided outside the casing and flows out of the second outlet is fixed to the second A second scroll duct that leads to the back side of the scroll end plate, and a part of the cooling air that is provided in the casing and flows in the second scroll duct to the back side of the end plate of the second orbiting scroll. It has a configuration in which Ru and a vent for flowing into the space formed.

According to the invention of claim 5, a partition plate for partitioning the orbiting scroll and the cooling fan is provided inside the casing , and the inflow port is disposed on the orbiting scroll side with the partition plate interposed therebetween, The outlet is arranged on the opposite side of the inlet with the partition plate in between.

According to the invention of claim 6, in the casing , there is provided one partition plate that partitions the motor and the cooling fan, and another partition plate that partitions the cooling fan and the orbiting scroll. The inlet is disposed closer to the motor than the one partition plate, the outlet is disposed between the one partition plate and the other partition plate, and the vent hole is the other partition plate. It is set as the structure arrange | positioned rather than the said turning scroll side.

Further, according to the invention of claim 7, the outer casing provided with a cooling device for cooling the gas discharged from the gas or the compression chamber is sucked into the compression chamber, outlets of the casing at a position different from the inlet 2 A scroll duct is connected to one of the outlets, and a cooler duct that guides cooling air to the cooler is connected to the other outlet.

  Furthermore, according to the invention of claim 8, the inflow port and the outflow port are formed at different positions, and a plurality of swirl sides extending along the flow of the cooling air flowing from the inflow port are formed on the back surface side of the end plate of the orbiting scroll. Cooling fins are provided, and a plurality of fixed-side cooling fins extending along the flow of cooling air guided from the outlet through the scroll duct are provided on the back surface side of the end plate of the fixed scroll.

According to the first aspect of the present invention, the cooling fan can be rotationally driven together while orbiting the orbiting scroll by the electric motor. As a result, the cooling fan can suck the cooling air from the inlet provided in the scroll accommodating portion via the back side of the orbiting scroll, and efficiently cool the end plate of the orbiting scroll with these cooling air. Can do. Then, this cooling air is allowed to flow out from the outlet provided in the side surface of the fan housing portion to the scroll duct provided outside the casing, so that the end plate of the fixed scroll can be efficiently cooled.

  Therefore, the cooling fan can be driven using an electric motor that is a power source of the machine, and it is not necessary to use an electric fan or the like as in the prior art. Noise, heat generation, power consumption, etc. due to the electric fan can be suppressed.

  Further, for example, since the electric motor and the cooling fan can be arranged side by side in the axial direction of the rotating shaft, sufficient cooling performance can be ensured while the entire machine is downsized in the radial direction. Thereby, a casing, a turning scroll, these cooling structures, etc. can be simplified and assembly work etc. can be performed efficiently.

According to the second aspect of the present invention, the cooling fan can be rotationally driven together while orbiting the orbiting scroll by the electric motor. Thus, the cooling fan can be driven by using the electric motor as the power source of the machine, and these electric motor and the cooling fan can be arranged side by side in the axial direction of the rotating shaft. Can be obtained. Further, the cooling fan sucks cooling air into the casing from the inlet provided in the fan accommodating portion, and the cooling duct is provided outside the casing from the outlet provided on the side surface of the fan accommodating portion. Can be drained into. And while supplying the cooling wind which flows in a duct to the back surface side of a fixed scroll, a part of this cooling air can be supplied also to the back surface side of a turning scroll by a vent hole.

Therefore, the cooling air can be divided into two flows and supplied separately to the fixed scroll and the orbiting scroll. For example, the cooling air warmed by cooling one scroll does not flow toward the other scroll. Further, the fixed scroll and the orbiting scroll can be efficiently cooled by the cooling air at a low temperature, and the cooling performance can be improved.
In addition, when the machine is in operation, the gas sucked into the compression chamber or the compressed gas discharged from the compression chamber can be cooled by a cooler, so that the compression efficiency of the gas can be increased or the dehumidification of the compressed gas can be performed. . A part of the cooling air sucked from the inlet can be discharged from the one outlet to the scroll duct, and can also be discharged from the other outlet to the cooler duct. Thereby, a fixed scroll, a turning scroll, and a cooler can be cooled efficiently, respectively, and the cooling performance of a machine can be improved.

According to the invention of claim 3, the first and second cooling fans can be rotationally driven together while the first and second orbiting scrolls are orbited by the electric motor. Thus, each cooling fan sucks cooling air from the first and second inlets provided in the first and second scroll accommodating portions via the back surfaces of the first and second orbiting scrolls, respectively. The end plate of each orbiting scroll can be efficiently cooled. Then, the cooling air is caused to flow out from the first and second outlets provided on the side surfaces of the first and second fan accommodating portions to the first and second scroll ducts provided outside the casing , The end plates of the first and second fixed scrolls can be efficiently cooled.

  Therefore, it is possible to drive two cooling fans by using an electric motor as a power source of the machine, and it is not necessary to use two electric fans or the like as in the prior art, so the number of parts such as an electric fan is reduced. Cost reduction can be promoted, and noise, heat generation, power consumption, etc. due to the electric fan can be suppressed.

  In addition, since each cooling fan can be arranged side by side on both sides in the axial direction of the electric motor, the entire machine can be reduced in size in the radial direction, and a wide range can be provided on both sides of the casing without complicating the structure of the casing and the orbiting scroll. Cooling performance can be enhanced. Thereby, also in the scroll type fluid machine provided with the compression part of two places, the structure for cooling can be simplified and the assembly etc. can be performed efficiently.

  According to the fourth aspect of the present invention, the first and second cooling fans can be rotationally driven together while the first and second orbiting scrolls are orbited by the electric motor. Thus, two cooling fans can be driven using an electric motor that is a power source of the machine, and these electric motors and each cooling fan can be arranged side by side in the axial direction of the rotating shaft. Similar effects can be obtained.

Further, the first cooling fan can suck the cooling air from the first inlet through the back surface side of the first orbiting scroll, in the same manner as in the first aspect of the invention. Can be supplied to the back side of the first fixed scroll. Thereby, since both the 1st fixed scroll and the 1st turning scroll can be cooled in series by the flow of one cooling wind, the cooling structure for cooling these two scrolls can be simplified.

On the other hand, in the second cooling fan, the cooling air is divided into two flows and supplied separately to the second fixed scroll and the second orbiting scroll, as in the case of the invention of claim 2. it can. Therefore, the second fixed scroll and the second orbiting scroll can be efficiently cooled in parallel by the low-temperature cooling air, and the cooling performance can be improved. Thus, in the scroll type fluid machine provided with two compression parts, a different cooling structure can be realized for each compression part.

  According to the invention of claim 5, the space on the orbiting scroll side and the space on the cooling fan side can be partitioned by the partition plate arranged between the orbiting scroll and the cooling fan. An inflow port can be opened in this space, and an outflow port can be opened in the space on the cooling fan side.

  For example, by forming an opening or the like in advance in a part of the partition plate, when the cooling fan is operated, the cooling air is sucked in from the inlet through the back side of the orbiting scroll by the rotation. Cooling air can flow out of the casing from the outlet. Therefore, the passage of the cooling air facing the orbiting scroll and the cooling fan can be formed with a simple structure using the partition plate, and the orbiting scroll and the like can be stably cooled.

  According to the invention of claim 6, the two partition plates can partition the inside of the casing into three spaces arranged in the axial direction. Of these three spaces, for example, an inflow port can be opened in a space on the electric motor side, and an outflow port can be opened in a space in which a cooling fan is accommodated. A vent can be opened in the space on the orbiting scroll side.

  Thus, when the cooling fan is operated, the cooling air sucked into the casing from the inflow port, the cooling air flowing out from the outflow port into the scroll duct, and the cooling air flowing through the ventilation port on the back side of the orbiting scroll Can be prevented from mixing with each other, and the flow of these three cooling airs can be reliably separated by the respective partition plates. Therefore, the flow of the cooling air can be stably formed with a simple structure using the partition plate.

  According to the invention of claim 7, during operation of the machine, the gas sucked into the compression chamber or the compressed gas discharged from the compression chamber can be cooled by the cooler to increase the compression efficiency of the gas, Dehumidification of gas can be performed. A part of the cooling air sucked from the inlet can be discharged from the one outlet to the scroll duct, and can also be discharged from the other outlet to the cooler duct.

  Thereby, a fixed scroll, a turning scroll, and a cooler can be cooled efficiently, respectively, and the cooling performance of a machine can be improved.

  According to the invention of claim 8, the inlet and the outlet can be arranged so as not to interfere with each other, and the cooling air sucked from the inlet can be circulated along the swirl side cooling fin in this state. At the same time, the cooling air guided from the outlet to the back surface of the fixed scroll can be circulated along the fixed cooling fins. Therefore, the cooling efficiency of the fixed scroll and the orbiting scroll can be increased.

  Hereinafter, a scroll type fluid machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 6 show a first embodiment. In this embodiment, a twin wrap type scroll type air compressor will be described as an example.

  In the figure, reference numeral 1 denotes a substantially cylindrical casing constituting the outer frame of the scroll type air compressor. The casing 1 constitutes a fixed member together with fixed scrolls 7A and 7B described later. As shown in FIGS. 1 and 2, the casing 1 includes an intermediate case 2 formed in a substantially cylindrical shape centered on the axis O 1 -O 1 and opened on both sides in the axial direction, and left and right sides of the intermediate case 2. The left and right outer cases 3A and 3B are attached.

  Here, as shown in FIGS. 5 and 6, the first outer case 3 </ b> A located on one side in the axial direction of the intermediate case 2 (left side in FIG. 2) is substantially open with one side in the axial direction open and the other side closed. It is formed in a bottomed cylindrical shape. The outer case 3A is formed with a bottomed cylindrical fan housing portion 4A attached to one end side of the intermediate case 2 by means of, for example, screwing and the like, and the diameter expanded to one end side of the fan housing portion 4A. The scroll accommodating portion 5A has a substantially triangular cylindrical shape.

  On the other hand, as shown in FIG. 5, the second outer case 3B located on the other axial side of the intermediate case 2 (the right side in FIG. 2) has a bottomed cylindrical shape with one axial side closed and the other opened. Is formed. The outer case 3B includes a bottomed cylindrical fan accommodating portion 4B attached to the other end side of the intermediate case 2, and a scroll accommodating portion 5B formed on the other end side of the fan accommodating portion 4B. ing.

  The fan housing portions 4A and 4B of the outer cases 3A and 3B accommodate cooling fans 38A and 38B, which will be described later, and the scroll housing portions 5A and 5B accommodate rotating scrolls 26A and 26B, which will be described later. is there.

  Further, the first outer case 3A constitutes a low-pressure stage compression section 6A together with a first fixed scroll 7A, a first orbiting scroll 26A and the like which will be described later, and the second outer case 3B is a second fixed scroll. 7B, the second orbiting scroll 26B, and the like constitute a high-pressure stage compression section 6B. In this case, since the compression units 6A and 6B of the low-pressure stage and the high-pressure stage have substantially the same constituent elements, in the following description, the constituent elements of the low-pressure stage will be described with reference numeral “A”. The constituent elements of the high-pressure stage will be described with the symbol “B”, and the description overlapping with the low-pressure stage will be omitted.

  Reference numeral 7A denotes a low-pressure stage fixed scroll provided on the opening side of the outer case 3A of the casing 1. The fixed scroll 7A is disposed around the axis O1-O1 of the casing 1 as shown in FIGS. A substantially disc-shaped end plate 8A, a spiral wrap portion 9A erected on the surface of the end plate 8A, and a cylindrical portion protruding in the axial direction so as to surround the wrap portion 9A from the outer peripheral side of the end plate 8A 10A and a flange portion 11A that protrudes radially outward from the outer peripheral side of the cylindrical portion 10A and is detachably attached to the opening side of the outer case 3A via a bolt or the like.

  Here, as shown in FIG. 5, two suction ports 12A for sucking fluid such as air are provided on the outer peripheral side of the end plate 8A, and a compressed air discharge port 13A is provided on the center side of the end plate 8A. ing. A plurality of fixed-side cooling fins 14A are provided on the rear surface of the end plate 8A so as to extend in the vertical direction along a cooling air flow direction (indicated by an arrow A3 in FIG. 2) to be described later.

  7B is a fixed scroll of a high pressure stage provided on the opening side of the outer case 3B of the casing 1, and the fixed scroll 7B is substantially the same as the fixed scroll 7A of the low pressure stage, an end plate 8B, a wrap part 9B, a cylinder part 10B, A plurality of fixed-side cooling fins 14 </ b> B extending in the vertical direction along the flow direction of the cooling air (indicated by the arrow B <b> 3 in FIG. 2) are provided on the back side of the end plate 8 </ b> B. Yes.

  Reference numeral 15 denotes an electric motor as an electric motor provided in the intermediate case 2 of the casing 1, and the electric motor 15 is arranged between the low-pressure stage fixed scroll 7A and the high-pressure stage fixed scroll 7B as shown in FIG. The cylindrical stator 16 is fixed to the inner peripheral side of the intermediate case 2, and the cylindrical rotor 17 is rotatably disposed on the inner peripheral side of the stator 16. The electric motor 15 rotates a rotation shaft 18 (described later) about the axis O1-O1.

  Reference numeral 18 denotes a rotating shaft that is rotatably provided on the casing 1, and the rotating shaft 18 is formed of, for example, a stepped cylindrical hollow rod, and an axial intermediate portion is fitted into the rotor 17 of the electric motor 15. It rotates integrally with the rotor 17 about the axis O1-O1. Further, the rotary shaft 18 is rotatably supported on both sides in the axial direction on the bottom side of the outer cases 3A and 3B (fan accommodating portions 4A and 4B) via rotary bearings 19A and 19B.

  Reference numeral 20A denotes a substantially cylindrical eccentric bush attached to one end of the rotary shaft 18. On the inner peripheral side of the eccentric bush 20A, as shown in FIG. 3, a rotary shaft fitting hole 21A and a connecting shaft fitting hole 22A are provided. These are in communication with each other and extend in the axial direction.

  Here, the rotary shaft 18 is fitted and fixed in the rotary shaft fitting hole 21A by means such as press fitting, and the rotary shaft 18 and the eccentric bush 20A are configured to rotate integrally. The connecting shaft fitting hole 22A is formed to have a larger diameter than the rotation shaft fitting hole 21A, and the center thereof is only the dimension δ (eccentricity δ) from the center (axis line O1-O1) of the rotation shaft fitting hole 21A. Eccentric.

  A connecting shaft 23 is rotatably fitted in the connecting shaft fitting hole 22A via an eccentric bearing 25A described later. As a result, even if the connecting shaft 23 is decentered by the amount of eccentricity δ with respect to the axis O1-O1, the outer peripheral surface of the eccentric bush 20A has a shape that does not contribute to the amount of eccentricity δ (that is, the axis O1-O1 is the center). (Cylindrical shape).

  Reference numeral 20B denotes a substantially cylindrical eccentric bush attached to the other end side of the rotary shaft 18. The eccentric bush 20B is substantially the same as the eccentric bush 20A on one end side as shown in FIG. And a connecting shaft fitting hole 22B.

  Reference numeral 23 denotes a connecting shaft provided by being inserted into the rotating shaft 18. The connecting shaft 23 is, for example, a stepped columnar rod as shown in FIG. Cylindrical crank portions 24A and 24B projecting in the direction. The crank portions 24A and 24B are connected to boss portions 29A and 29B of orbiting scrolls 26A and 26B, which will be described later.

  Further, the connecting shaft 23 is attached to the rotary shaft 18 via the eccentric bearings 25A and 25B and the eccentric bushes 20A and 20B so as to be relatively rotatable, and is eccentric by a dimension δ with respect to the axis O1-O1 of the rotary shaft 18 or the like. It is arranged on the eccentric axis O2-O2. The connecting shaft 23 orbits together with the orbiting scrolls 26A and 26B when the rotating shaft 18 rotates.

  26A is a low-pressure stage orbiting scroll provided facing the fixed scroll 7A in the casing 1, and the low-pressure stage orbiting scroll 26A has a substantially disk-shaped end plate as shown in FIG. 27A, a spiral wrap portion 28A standing on the surface of the end plate 27A, and a cylindrical boss portion 29A standing on the back surface of the end plate 27A.

  Reference numeral 26B denotes a high-pressure stage orbiting scroll provided facing the fixed scroll 7B. The orbiting scroll 26B is substantially the same as the low-pressure stage orbiting scroll 26A as shown in FIG. It is comprised by the part 29B etc.

  Here, the end plates 27A and 27B are accommodated in the scroll accommodating portions 5A and 5B of the outer cases 3A and 3B. In addition, a plurality of swivel-side cooling fins 30A and 30B are erected on the rear surfaces of the end plates 27A and 27B, and these cooling fins 30A and 30B are provided in the direction of cooling air flow (arrow A1 in FIG. 5). (B1 direction) extends substantially in the horizontal direction so as to be orthogonal to the fixed cooling fins 14A and 14B.

  Further, the wrap portions 28A and 28B are arranged so as to overlap with the wrap portions 9A and 9B of the fixed scrolls 7A and 7B while being shifted by a predetermined angle (for example, 180 degrees), and thereby, between the lap portions 9A and 28A of the low pressure stage. A plurality of compression chambers 31A are defined from the outer peripheral side to the inner peripheral side, and a plurality of compression chambers 31B are also defined between the wrap portions 9B and 28B of the high-pressure stage from the outer peripheral side to the inner peripheral side. ing.

  Further, the boss portions 29A and 29B are integrally fixed to the crank portions 24A and 24B of the connecting shaft 23 using bolts (not shown), respectively. The orbiting scrolls 26A and 26B are driven by the electric motor 15 via the rotating shaft 18, the connecting shaft 23, and the like, and perform orbiting motions with a constant orbiting radius corresponding to the eccentricity δ. The air is compressed by 31B, and at the time of the turning operation, rotation is prevented by an auxiliary crank 32 (see FIG. 2) as a rotation preventing mechanism.

  On the other hand, as shown in FIG. 1, silencers 33 are respectively provided in the suction ports 12A of the low pressure stage. Further, a pipe 34 is connected to the discharge port 13 </ b> A of the low pressure stage, and this pipe 34 is connected to a pipe 35 via a cooler 47. The pipe 35 is connected to a suction port (not shown) of the high pressure stage.

  Further, another pipe 36 is connected to the high-pressure stage outlet 13 </ b> B, and this pipe 36 is connected to a pipe 37 via a cooler 47. The pipe 37 is connected to an external air tank (not shown). Thus, the air compressor of the present embodiment is configured as a two-stage compressor that sequentially compresses the air sucked from the silencer 33 by the low-pressure stage and high-pressure stage compression sections 6A and 6B.

  38A is a low-pressure stage cooling fan as a first cooling fan provided on one side in the axial direction of the rotating shaft 18, and the cooling fan 38A comprises, for example, a centrifugal fan or the like, as shown in FIGS. The rotary shaft 18 is fitted to the outer peripheral side via an eccentric bush 20A, and is fixed to the eccentric bush 20A using a key member 39A for stopping rotation. The cooling fan 38A is accommodated in the fan accommodating portion 4A of the outer case 3A in the casing 1, and is disposed between the electric motor 15 and the orbiting scroll 26A in the low pressure stage.

  38B is a high-pressure stage cooling fan as a second cooling fan provided on the other side in the axial direction of the rotating shaft 18. The cooling fan 38B is a centrifugal fan having the same shape as the cooling fan 38A, for example, as shown in FIG. It is composed of a fan or the like, and is attached to the rotary shaft 18 via the eccentric bush 20B, and is housed in the fan housing portion 4B of the outer case 3B, positioned between the electric motor 15 and the orbiting scroll 26B of the high pressure stage. .

  The cooling fans 38A and 38B are positioned on both sides in the axial direction of the electric motor 15 and face the orbiting scrolls 26A and 26B. By rotating together with the rotary shaft 18 at this position, the rear surfaces of the fixed scrolls 7A and 7B. Cooling air is supplied to the back side of the orbiting scrolls 26A and 26B and a cooler 47 described later.

  Reference numeral 40A denotes a low-pressure stage partition plate as a first partition plate provided in the outer case 3A. The partition plate 40A is made of, for example, an annular metal plate, a resin plate, and the like. It is attached to a position that partitions between the fan 38A (between the fan housing portion 4A and the scroll housing portion 5A).

  In addition, an opening 41A is formed in the center of the partition plate 40A with a gap on the outer peripheral side of the boss portion 29A of the orbiting scroll 26A. The opening 41A is a fan housing portion defined by the partition plate 40A. The space in 4A communicates with the space in scroll accommodating portion 5A.

  Reference numeral 40B denotes a high-pressure stage partition plate as a second partition plate provided in the outer case 3B. The partition plate 40B has an opening 41B formed on the inner peripheral side in substantially the same manner as the low-pressure stage partition plate 40A. It is made of an annular metal plate, a resin plate, and the like, and is attached to a position that partitions between the high-pressure stage orbiting scroll 26B and the cooling fan 38B (between the fan housing portion 4B and the scroll housing portion 5B).

  42A is a low-pressure stage inlet serving as a first inlet provided in, for example, two places in the scroll accommodating portion 5A of the outer case 3A. Each inlet 42A includes a scroll accommodating portion as shown in FIGS. It is formed between a notch provided at the opening end of 5A and the flange portion 11A of the fixed scroll 7A, and is open to the side surface on both sides in the horizontal direction (left and right directions) of the scroll accommodating portion 5A.

  42B is a high-pressure stage inlet as a second inlet provided, for example, in two places in the scroll accommodating portion 5B of the outer case 3B. Each of the inlets 42B is substantially the same as the low-pressure stage inlet 42A. It opens to the side surface on both sides in the horizontal direction (left and right directions) of the accommodating portion 5B.

  When the cooling fans 38A and 38B are operated, external air is sucked into the scroll accommodating portions 5A and 5B from the respective inlets 42A and 42B to become cooling air, and these cooling air flows in a substantially horizontal direction, The back side of the orbiting scrolls 26A and 26B is cooled.

  43A is a low-pressure stage outlet as a first outlet provided, for example, in two places in the fan accommodating portion 4A of the outer case 3A, and each outlet 43A is in the vertical direction (upward and downward direction) of the fan accommodating portion 4A. ) Are open on the sides on both sides. In this case, the inflow port 42A and the outflow port 43A are arranged apart from each other in the axial direction (the orbiting scroll 26A side and the cooling fan 38A side) with the partition plate 40A interposed therebetween, and the periphery of the outer case 3A. They are formed at different positions with respect to the direction.

  43B is an outlet of a high-pressure stage as a second outlet provided, for example, in two places in the fan housing portion 4B of the outer case 3B. Each outlet 43B is substantially the same as the outlet 43A of the low-pressure stage. It opens to the side surface on both sides in the vertical direction of the accommodating portion 4B, and is arranged on the opposite side of the inlet 42B in the axial direction with the partition plate 40B interposed therebetween.

  During the operation of the cooling fan 38A, the cooling air in the scroll housings 5A and 5B is sucked into the fan housings 4A and 4B through the openings 41A and 41B of the partition plates 40A and 40B. As shown by arrows A2 and B2 in FIG. 2, the gas flows out from the outlets 43A into ducts 44A and 46A described later, and flows out from the outlets 43B into ducts 44B and 46B described later.

  44A is a first (low pressure stage) scroll duct provided on the lower side of the outer case 3A. The scroll duct 44A is formed in a hollow box shape, for example, from a position covering the lower outlet 43A. While extending to the position of a lower fixed scroll vent 45A (fixed side cooling fin 14A), which will be described later, these outlet 43A and vent 45A are connected.

  44B is a second (high-pressure stage) scroll duct provided on the lower side of the outer case 3B. The scroll duct 44B is located at the same position as the low-pressure stage duct 44A and covers the lower outlet 43B. To the position of a lower fixed scroll vent 45B, which will be described later, and these outlet 43B and vent 45B are connected.

  The scroll ducts 44A and 44B cool the end plates 8A and 8B and the like by guiding the cooling air flowing out from the lower outlets 43A and 43B to the back surfaces of the fixed scrolls 7A and 7B, respectively.

  Reference numeral 45A denotes first fixed scroll vents provided on both the upper and lower sides of the low-pressure stage fixed scroll 7A. These first fixed scroll vents 45A are located on both ends of the fixed cooling fin 14A. The opening is formed on the outer surface side of the fixed scroll 7A. The fixed scroll vent 45A distributes the cooling air flowing in the duct 44A to the rear surface side of the end plate 8A along the fixed cooling fins 14A. Similarly, the second fixed scroll vent 45B is provided in the high-pressure stage fixed scroll 7B.

  Reference numeral 46A denotes a first (low pressure stage) cooler duct provided in the outer case 3A. The cooler duct 46A is formed in, for example, a hollow box shape and covers the upper outlet 43A, and the outlet 43A. And a cooler 47 described later.

  46B is a second (high pressure stage) cooler duct provided in the outer case 3B. The cooler duct 46B is located between the upper outlet 43B and the cooler 47 in the same manner as the low pressure stage duct 46A. It is connected to the.

  The two cooler ducts 46A and 46B guide the cooling air flowing out from the upper outlets 43A and 43B to the inside of the cooler 47 when the cooling fans 38A and 38B rotate.

  In FIG. 1, reference numeral 47 denotes a cooler provided on the upper side of the casing 1 (intermediate case 2). In the cooler 47, the pipes 34, 35, 36, and 37 are bent and arranged in a zigzag shape. These pipes 34 to 37 are radiated by the cooling air of the cooling fans 38A and 38B. The cooler 47 includes, for example, an intercooler that cools intermediate-pressure compressed air discharged from the low-pressure stage compression chamber 31A and sucked into the high-pressure stage compression chamber 31B, and high-pressure compression discharged from the compression chamber 31B. It is configured as a twin cooler integrated with an aftercooler that cools the air.

  On the other hand, in FIG. 2, reference numeral 48A denotes a space between the scroll and the partition plate formed between the scrolls 7A and 26A and the partition plate 40A in the outer case 3A of the low-pressure stage. The scroll 26A is disposed so as to face the rear surface side of the end plate 27A, and an inflow port 42A is opened in the space 48A.

  Further, 49A is a motor / partition plate space formed between the motor 15 and the partition plate 40A in the outer case 3A. The motor / partition plate space 49A accommodates a cooling fan 38A, The outlet 43A is open. Further, similarly, the partition-plate 40B defines a scroll / partition plate space 48B and a motor / partition-plate space 49B in the outer case 3B of the high-pressure stage.

  The twin wrap type scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when electric power is supplied to the electric motor 15, the rotary shaft 18 is driven to rotate about the axis O1-O1 by the rotor 17. As a result, when the connecting shaft 23 attached in an eccentric state in the rotating shaft 18 performs the orbiting motion, the orbiting scrolls 26A and 26B connected to both ends thereof have a dimension δ with respect to the fixed scrolls 7A and 7B. A turning operation with a turning radius is performed.

  As a result, the compression unit 6A in the low pressure stage sequentially compresses the air in each compression chamber 31A while sucking outside air from the suction port 12A provided on the outer peripheral side of the fixed scroll 7A via the silencer 33. The intermediate-pressure compressed air compressed in the compression chamber 31A of the low-pressure stage is discharged from the discharge port 13A of the fixed scroll 7A to the cooler 47 through the pipe 34.

  Further, in the high-pressure stage compression section 6B, when compressed air of intermediate pressure compressed by the low-pressure stage compression section 6A is supplied from the cooler 47 to the suction port of the fixed scroll 7B via the pipe 35, the compressed air Are further compressed in each compression chamber 31B, and high-pressure compressed air is discharged from the discharge port 13B to the pipe 36. The compressed air is cooled by a cooler 47 and stored in an air tank or the like via another pipe 37.

  Next, the flow of cooling air for cooling the air compressor will be described. First, when the rotating shaft 18 rotates, the cooling fans 38A and 38B attached to the outer peripheral side thereof are rotationally driven. As a result, when the air in the outer cases 3A and 3B flows out from the outlets 43A and 43B due to centrifugal force, the outside air becomes cooling air from the side inlets 42A and 42B into the scroll / partition plate spaces 48A and 48B. Sucked.

  When the cooling air is sucked into the space 48A, 48B between the scroll and the partition plate via the back side of the orbiting scrolls 26A, 26B, as shown by arrows A1, B1 in FIGS. Furthermore, the end plates 27A and 27B flow in a substantially horizontal direction along the turning-side cooling fins 30A and 30B, and the end plates 27A and 27B and the turning-side cooling over a long distance from the outer peripheral side of the turning scrolls 26A and 26B to the central portion (positions of the openings 41A and 41B). Since they come into contact with the fins 30A, 30B, etc., they can be efficiently cooled.

  Further, the cooling air is sucked into the motor-partition plate spaces 49A and 49B from the openings 41A and 41B of the partition plates 40A and 40B by the rotation of the cooling fans 38A and 38B, and a part thereof is shown in FIGS. As shown by arrows A2 and B2 in FIG. 4, the gas flows out from the lower outlets 43A and 43B into the scroll ducts 44A and 44B. The cooling air flowing into the scroll ducts 44A and 44B flows in a substantially vertical direction along the fixed-side cooling fins 14A and 14B as indicated by arrows A3 and B3, and the fixed scrolls 7A and 7B. The end plates 8A and 8B can be cooled from the back side.

  On the other hand, a part of the cooling air sucked into the motor / partition plate spaces 49A and 49B flows out into the cooler ducts 46A and 46B from the upper outlets 43A and 43B as shown by arrows A4 and B4. The Then, the cooling air is guided to the cooler ducts 46A and 46B and passes through the cooler 47, thereby being discharged from the compressed air of the intermediate pressure sucked into the compression unit 6B of the high pressure stage or the compression unit 6B. High pressure compressed air can be cooled.

  Thus, according to the present embodiment, the first and second cooling fans 38A and 38B are provided on the both sides in the axial direction of the rotary shaft 18 at positions facing the first and second orbiting scrolls 26A and 26B. The outer cases 3A and 3B of the casing 1 have first and second inlets 42A and 42B, first and second outlets 43A and 43B, first and first corresponding to the cooling fans 38A and 38B. Two scroll ducts 44A and 44B, first and second cooler ducts 46A and 46B, and the like are provided.

  Thereby, when the compressor is operated, the rotary shaft 18 can be driven by the electric motor 15 to cause the first and second orbiting scrolls 26A and 26B to perform the orbiting motion. At this time, the two cooling fans 38A and 38B can be operated. Can be rotated together at a position facing the orbiting scrolls 26A, 26B.

  As a result, each of the cooling fans 38A and 38B can suck the cooling air from the inlets 42A and 42B to the back side of the orbiting scrolls 26A and 26B, as indicated by arrows A1 and B1 in FIG. The end plates 27A and 27B on the turning side can be efficiently cooled by the cooling air.

  Then, these cooling winds can flow out from the outlets 43A and 43B to the scroll ducts 44A and 44B and be guided to the back side of the fixed scrolls 7A and 7B, and as shown by arrows A3 and B3 in FIG. As described above, the fixed-side end plates 8A, 8B and the like can be efficiently cooled.

  Accordingly, the cooling fans 38A and 38B can be driven by using the electric motor 15 as a power source of the compressor, and it is not necessary to use two electric fans or the like as in the prior art. The cost can be reduced and the cost can be reduced, and noise, heat generation, power consumption, etc. due to the electric fan can be suppressed.

  Further, since the cooling fans 38A and 38B can be arranged side by side on both sides in the axial direction of the electric motor 15, there is no need to attach a structure such as an electric motor to the outside of the casing 1, and the entire compressor can be downsized in the radial direction. it can. And even if it does not complicate the structure of the casing 1 or the turning scrolls 26A and 26B, the cooling performance can be enhanced over a wide range on both axial sides of the casing 1. Thereby, also in the air compressor provided with two compression parts 6A and 6B, the structure for cooling can be simplified and the assembly etc. can be performed efficiently.

  Further, a cooler 47 is provided on the upper side of the casing 1, the inlets 42A and 42B are formed on the side surfaces of the outer cases 3A and 3B of the casing 1, and the outlets 43A and 43B are the upper and lower sides of the outer cases 3A and 3B. And formed respectively. Then, scroll ducts 44A and 44B are connected to the lower outlets 43A and 43B, and cooler ducts 46A and 46B are connected to the upper outlets 43A and 43B.

  For this reason, the cooler 47 can cool, for example, compressed air of intermediate pressure sucked into the compression unit 6B of the high-pressure stage, high-pressure compressed air discharged from the compression unit 6B, etc. While performing dehumidification of air, etc., the performance of a compressor can be improved by this.

  When the cooling fans 38A and 38B are operated, the cooling air is sucked into the back surfaces of the orbiting scrolls 26A and 26B from the side inlets 42A and 42B, and a part of the cooling air is supplied from the lower outlets 43A and 43B. While being able to flow out to the scroll ducts 44A and 44B, part of the cooling air can further flow out from the upper outlets 43A and 43B to the cooler ducts 46A and 46B. Thereby, each fixed scroll 7A, 7B, each turning scroll 26A, 26B, and the cooler 47 can be cooled efficiently, respectively, and the cooling performance of a compressor can be improved.

  In this case, the inlets 42A, 42B, the lower outlets 43A, 43B (scroll ducts 44A, 44B) and the upper outlets 43A, 43B (cooler ducts 46A, 46B) are connected to the outer casings 3A, 3B. Since the ducts 44A, 44B, 46A, 46B can be arranged at positions different from each other and avoid the inlets 42A, 42B, the inlets 42A, 42B are made sufficiently large. The shape of the duct can be simplified while forming.

  Further, the cooler 47 and the ducts 44A, 44B, 46A, 46B can be arranged in a compact manner so as to overlap the upper side and the lower side of the casing 1, whereby the entire compressor can be easily downsized in the horizontal direction. Even if it is a compressor provided with a plurality of ducts and coolers 47, the installation area can be kept small.

  In addition, since the annular partition plates 40A and 40B whose inner peripheral sides are openings 41A and 41B are provided between the fan housing portions 4A and 4B of the outer cases 3A and 3B and the scroll housing portions 5A and 5B, These partition plates 40A and 40B can partition the space in the fan housing portions 4A and 4B from the space in the scroll housing portions 5A and 5B. In this state, the scroll housing portions 5A and 5B have inlets 42A and 42B. The outlets 43A and 43B can be opened in the fan accommodating portions 4A and 4B.

  Accordingly, when the cooling fan is operated, the cooling air can be sucked in over a long distance from the inlets 42A and 42B to the center of the rear surface of the orbiting scrolls 26A and 26B (positions of the openings 41A and 41B). , 26B end plates 27A, 27B, cooling fins 30A, 30B, etc., can be increased in distance. Accordingly, a cooling air passage facing the orbiting scrolls 26A and 26B and the cooling fans 38A and 38B can be formed with a simple structure using the partition plates 40A and 40B, and the orbiting scrolls 26A and 26B and the like can be stably cooled. Can do.

  On the other hand, fixed-side cooling fins 14A and 14B extending in the vertical direction are provided on the rear surfaces of the end plates 8A and 8B of the fixed scrolls 7A and 7B, and the rear surfaces of the end plates 27A and 27B of the orbiting scrolls 26A and 26B extend in the horizontal direction. Since the turning-side cooling fins 30A and 30B are provided, the cooling air sucked from the side inlets 42A and 42B can be circulated in the horizontal direction along the turning-side cooling fins 30A and 30B. Cooling air guided from the outlets 43A and 43B to the lower back side of the fixed scrolls 7A and 7B can be circulated upward along the fixed cooling fins 14A and 14B. Therefore, the cooling efficiency of the fixed scrolls 7A and 7B and the orbiting scrolls 26A and 26B can be further increased.

  In addition, since the casing 1 is formed by three members including the intermediate case 2 and the outer cases 3A and 3B, the first fixed scroll 7A, the orbiting scroll 26A, and the cooling fan 38A can be arranged in the outer case 3A, and the outer case 3A. In the case 3B, the second fixed scroll 7B, the orbiting scroll 26B, and the cooling fan 38B can be arranged, the structure of the casing 1 can be simplified, and the compressor can be assembled efficiently.

  Furthermore, since the eccentric bushes 20A and 20B are provided at both ends of the rotary shaft 18, and the connecting shaft 23 is provided on the inner peripheral side of each eccentric bush 20A and 20B via the eccentric bearings 25A and 25B, the outer periphery of the eccentric bushes 20A and 20B. The side can be easily formed as a cylindrical surface centered on the axis O1-O1 regardless of the eccentricity δ of the connecting shaft 23, and can be stably rotated by attaching the cooling fans 38A and 38B to these portions. .

  In this case, when the rotating shaft 18 rotates in one direction, for example, the rotation direction of the cooling fan 38A viewed from the compression unit 6A side and the rotation direction of the cooling fan 38B viewed from the compression unit 6B side are opposite to each other. . However, since the cooling fans 38A and 38B are constituted by centrifugal fans capable of blowing air in any direction, these cooling fans 38A and 38B can be formed as parts having the same shape, and the entire compressor parts. The number of points can be reduced to reduce costs and improve productivity.

  Next, FIG. 7 to FIG. 11 show a second embodiment according to the present invention. The feature of this embodiment is that the cooling structure is made different between the low pressure side compression section and the high pressure side compression section. There is. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 51 denotes a casing that constitutes a fixed side member together with fixed scrolls 55A and 55B, which will be described later. As shown in FIGS. 7 and 8, the casing 51 is open on both sides in the axial direction as in the first embodiment. The substantially cylindrical intermediate case 52 and a bottomed cylinder are formed, and the bottom side is constituted by first and second outer cases 53A and 53B attached to one side and the other side of the intermediate case 52 in the axial direction. Has been.

The first outer case 53A includes a fan housing portion 4A and a scroll housing portion 5A, and constitutes a low-pressure stage compression portion 54A together with a first fixed scroll 55A, a first orbiting scroll 66A, and the like which will be described later . . The second outer case 53B is made of the fan housing section 4B and the scroll accommodating portion 5B, second fixed scroll 55B, it constitutes a compression portion 54B of the high-pressure stage with such second orbiting scroll 66B. The fan housing portions 4A and 4B of the outer cases 53A and 53B house cooling fans 71A and 71B, which will be described later, and the scroll housing portions 5A and 5B house turning scrolls 66A and 66B which will be described later.

  55A is a low-pressure stage fixed scroll attached to the outer case 53A. As shown in FIG. 9, the fixed scroll 55A is similar to the first embodiment in the end plate 56A, the wrap portion 57A, the cylinder portion 58A, The flange portion 59A, the suction port 60A (see FIG. 7), the discharge port 61A, the fixed cooling fin 62A, and the like are configured.

  55B is a fixed scroll of a high-pressure stage attached to the outer case 53B. As shown in FIG. 10, the fixed scroll 55B is substantially the same as the low-pressure stage, such as an end plate 56B, a wrap part 57B, a cylinder part 58B, a flange part. 59B, a suction port (not shown), a discharge port 61B, a fixed-side cooling fin 62B, and the like.

  Between the fixed scrolls 55A and 55B, a rotary shaft 18 rotatably supported on the bottom side of the outer cases 53A and 53B via the rotary bearings 19A and 19B is provided in substantially the same manner as in the first embodiment. Eccentric bushes 63 </ b> A and 63 </ b> B are fitted on both ends of the rotary shaft 18.

  In this case, the rotation shaft fitting holes 64A and 64B in which the rotation shaft 18 is fitted to the eccentric bushes 63A and 63B, and the connection shaft in which the connection shaft 23 is rotatably fitted via the eccentric bearings 25A and 25B. Fitting holes 65A and 65B are formed. As a result, the connecting shaft 23 is rotatably attached to the rotating shaft 18 via the eccentric bearings 25A and 25B and the eccentric bushes 63A and 63B as shown in FIG. Yes.

  Reference numeral 66A denotes a low-pressure-stage orbiting scroll, and the orbiting scroll 66A is configured by an end plate 67A, a lap portion 68A, a boss portion 69A, a turning-side cooling fin 70A, and the like, as in the first embodiment. In addition, 66B is a high-pressure stage orbiting scroll, and the orbiting scroll 66B is composed of an end plate 67B, a wrap part 68B, a boss part 69B, a revolving-side cooling fin 70B, etc., as in the low-pressure stage. The cooling fins 70B extend in the vertical direction substantially along the flow direction of cooling air, which will be described later (the direction of arrow b4 in FIG. 10).

  Next, 71A is a low-pressure stage cooling fan as a first cooling fan provided on one side in the axial direction of the rotating shaft 18, and the first cooling fan 71A is the first embodiment as shown in FIG. In substantially the same manner as this, it is constituted by, for example, a centrifugal fan or the like, accommodated in the outer case 53A, and attached to one axial side of the rotary shaft 18 using an eccentric bush 63A.

Further, an annular partition plate 72A as a first partition plate for partitioning between the cooling fan 71A and the orbiting scroll 66A is provided in the outer case 53A, and an opening 73A is formed at the center thereof. . Further, the scroll housing portion 5A of the outer case 53A, together with the first inlet 75A is provided, the outer case 53A, Ru Tei first outlet 76A opened in the side surface of the fan housing portion 4A is provided . The outer case 53A is provided with a first scroll duct 77A, a first fixed scroll vent 78A, and a first cooler duct 80A.

  Thus, the cooling structure of the low-pressure stage compression section 54A is configured in substantially the same manner as in the first embodiment. During the operation of the compressor, the cooling fan 71A is rotationally driven together with the rotary shaft 18, whereby cooling air is generated in the directions indicated by arrows a1, a2, a3, and a4 in FIG. Cooling air is supplied to the back side, the back side of the orbiting scroll 66 </ b> A, and the cooler 47.

  On the other hand, 71B is a high-pressure stage cooling fan as a second cooling fan provided on the other axial side of the rotary shaft 18, and the second cooling fan 71B is the first embodiment as shown in FIG. In substantially the same manner as the embodiment, it is constituted by, for example, a centrifugal fan or the like, accommodated in the outer case 53B, and attached to the other axial side of the rotary shaft 18 using an eccentric bush 63B.

  However, in the first embodiment, the cooling fan 38B sucks the cooling air from the inlet 42B via the back surface side of the orbiting scroll 26B, and supplies this cooling air to the back surface side of the fixed scroll 7B. Yes.

  On the other hand, in this embodiment, the cooling fan 71B is arranged in the opposite direction to the first embodiment with respect to the axial direction. The cooling fan 71B sucks cooling air from the inlet 75B to the bottom side of the outer case 53B as will be described later, and supplies this cooling air in parallel to the back surface side of the fixed scroll 55B and the back surface side of the orbiting scroll 66B. It is the composition to do.

  72B is one partition plate provided in the outer case 53B, and the partition plate 72B constitutes a second partition plate together with another partition plate 74B described later. These partition plates 72B and 74B are formed of, for example, an annular metal plate, a resin plate or the like, and are arranged on one side and the other side in the axial direction with the cooling fan 71B interposed therebetween.

  In this case, the partition plate 72B on one side in the axial direction is disposed at a position that partitions the space on the electric motor 15 side and the cooling fan 71B in the outer case 53B. In addition, an opening 73B through which cooling air flows from an inlet 75B described later toward the inner periphery side (suction side) of the cooling fan 71B is provided on the inner periphery side of the partition plate 72B.

  74B is another partition plate provided in the outer case 53B. The partition plate 74B is disposed on the other side in the axial direction of the cooling fan 71B, and between the cooling fan 71B and the orbiting scroll 66B in the outer case 53B. It is arranged at a partitioning position.

75B shows a second inlet which kicked plurality箇Tokoro設 the fan housing portion 4B of the outer case 53B, these second inlet 75B is 7, 8, as shown in FIG. 11, for example an outer casing It is formed on both sides in the diameter direction of 53B and opens to one side in the axial direction of the outer case 53B (a position closer to the electric motor 15 side than the partition plate 72B).

  Moreover, the inflow port 75B is arrange | positioned in the position facing the rotation bearing 19B etc., for example. Therefore, when the cooling fan 71B is operated, the rotary bearing 19B and the like can be efficiently cooled by the cooling air sucked into the outer case 53B from the inflow port 75B, as shown by the arrow b1 in FIG.

76B is a second outlet provided, for example, in two places in the fan accommodating portion 4B of the outer case 53B. These second outlets 76B are substantially perpendicular to the outer case 53B in the same manner as in the first embodiment. It is formed on the sides on both sides (up and down). Further, the outflow port 76B is disposed on the radially outer side of the cooling fan 71B, and opens between the partition plates 72B and 74B in the intermediate portion in the axial direction of the outer case 53B.

  When the cooling fan 71B is operated, the cooling air flowing in the outer case 53B flows out from the lower outlet 76B to the scroll duct 77A as shown by an arrow b2 in FIG. Is configured to flow out from the upper outlet 76B to a cooler duct 80A described later.

  77B is a second scroll duct provided on the outer peripheral side of the outer case 53B. The second scroll duct 77B is formed in a hollow box shape, for example, and will be described later from a position covering the lower outlet 76B. It extends to the position of the fixed scroll vent 78B via the lower orbiting scroll vent 79B.

  The scroll duct 77B connects the outflow port 76B, the lower fixed scroll vent 78B, and the orbiting scroll vent 79B to each other, and the cooling air flowing out from the outflow port 76B swirls with the back side of the fixed scroll 55B. It leads to the back side of the scroll 66B.

  Reference numeral 78B denotes second fixed scroll vents provided on both the upper and lower sides of the fixed scroll 55B in the high-pressure stage, and the second fixed scroll vents 78B are positioned on both ends of the fixed cooling fin 62B. The opening is formed on the outer surface side of the fixed scroll 55B. The fixed scroll vent 78B allows the cooling air flowing in the scroll duct 77B to flow along the fixed cooling fins 62B to the back side of the end plate 56B, as indicated by an arrow b3 in FIG. .

  79B are, for example, two orbiting scroll vents provided on the upper and lower sides of the outer case 53B. These orbiting scroll vents 79B are closer to the orbiting scroll 66B than the partition plate 74B on the other side in the axial direction. It is arranged and is located outside in the radial direction of the orbiting scroll 66B and opens into the scroll duct 77B.

  The lower orbiting scroll vent 79B is disposed between the lower inflow port 75B and the fixed scroll vent 78B. Then, as shown by the arrow b4 in FIG. 10, the orbiting scroll vent 79B allows a part of the cooling air flowing in the duct 77B to pass along the orbiting side cooling fins 70B on the back side of the end plate 67B. It distribute | circulates to the space 85 between partition plates. Further, 80B is a second cooler duct connected to the upper outlet 76B, and the second cooler duct 80B guides the cooling air flowing out from the upper outlet 76B into the cooler 47. It has become.

  On the other hand, reference numeral 81 denotes a scroll / partition plate space formed between the scrolls 55A and 66A and the partition plate 72A in the outer case 53A of the low pressure stage, and the scroll / partition plate space 81 is the first embodiment. Almost the same as the embodiment, the orbiting scroll 66A is disposed so as to face the rear surface side of the end plate 67A, and an inflow port 75A is opened in the space 81. Reference numeral 82 denotes a motor / partition plate space formed between the motor 15 and the partition plate 72A in the outer case 53A. The motor / partition plate space 82 accommodates a cooling fan 71A, The outflow port 76A is open.

  Further, reference numeral 83 denotes a motor-partition plate space formed between the motor 15 and the one partition plate 72B in the outer case 53B of the high-pressure stage. The motor-partition plate space 83 has an inlet 75B opened therein. is doing. Reference numeral 84 denotes a space between the partition plates formed between the partition plates 72B and 74B in the outer case 53B. The space 84 between the partition plates accommodates the cooling fan 71B and opens the outlet 76B. is doing. Reference numeral 85 denotes a scroll / partition plate space formed in the outer case 53B between the scrolls 55B and 66B and the other partition plate 74B. The scroll / partition plate space 85 is an end plate 67B of the orbiting scroll 66B. The orbiting scroll vent 79B is open in this space 85.

  The twin wrap type scroll air compressor according to the present embodiment has the above-described configuration, and the flow of cooling air will be described next.

  First, in the compression section 54A of the low-pressure stage, as shown by arrows a1, a2, a3, and a4 in FIG. 9, cooling air flows along substantially the same path as in the first embodiment. In this case, when the cooling fan 71A is operated, cooling air is sucked into the space 81 between the scroll and the partition plate from the inlet 75A via the back surface side of the orbiting scroll 66A. Then, this cooling air flows out from the motor / partition plate space 82 into the ducts 77A and 80A through the upper and lower outlets 76A and 76B to cool the fixed scroll 55A and the cooler 47, respectively.

  On the other hand, in the compression section 54B of the high-pressure stage, as shown by an arrow b1 in FIG. 10, first, the cooling fan 71B is operated to suck cooling air from the inlet 75B into the space 83 between the motor and the partition plate. The cooling air flows into the inter-partition plate space 84 through the opening 73B of the partition plate 72B. The cooling air that has flowed into the inter-partition plate space 84 flows out from the lower outlet 76B into the scroll duct 77B by being blown out from the outer peripheral side of the cooling fan 71B, as indicated by an arrow b2, and the upper side. Outflow port 76B flows into the cooler duct 80B.

  In this case, as shown by the arrow b3, a part of the cooling air flowing into the scroll duct 77B flows through the back side of the fixed scroll 55B through the upper and lower fixed scroll vents 78B. Cooling. Further, as shown by arrow b4, the remaining cooling air flows through the space 85 between the scroll and the partition plate by the upper and lower orbiting scroll vents 79B and cools the orbiting scroll 66B.

  Further, the cooling air flowing out from the upper outlet 76B is guided to the cooler duct 80B and flows into the cooler 47 as shown by an arrow b5, so that the cooling efficiency of the cooler 47 can be improved.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, the cooling fan 71B of the high pressure stage is disposed in the opposite direction to that of the first embodiment, and the orbiting scroll vent 79B is provided in the outer case 53B.

  Thereby, in the compression part 54B on the high-pressure side, the cooling air sucked from the inflow port 75B can be divided into two flows and supplied separately to the fixed scroll 55B and the orbiting scroll 66B, respectively. The cooling air can be used to cool in parallel.

  Therefore, for example, since the cooling air heated by cooling one scroll does not flow toward the other scroll, each of the scrolls 55B and 66B can be efficiently cooled by the low temperature cooling air, and the cooling performance can be improved. Can be increased.

  In this case, since the two partition plates 72B and 74B are provided in the outer case 53B of the high-pressure stage with the cooling fan 71B interposed therebetween, the inlet 75B, the outlet 76B and the orbiting scroll are provided by these partition plates 72B and 74B. The air vents 79B can be partitioned. In the outer case 53B, three spaces including a motor / partition plate space 83, a partition plate space 84, and a scroll / partition plate space 85 can be defined.

  As a result, when the cooling fan 71B is in operation, as shown in FIG. 10, the cooling air in the direction indicated by the arrow b1 is sucked into the motor / partition plate space 83 from the inlet 75B, and the outlet 76B from the partition plate space 84. Prevents the cooling air in the direction indicated by the arrow b2 flowing into the scroll duct 77B from passing through and the cooling air in the direction indicated by the arrow b4 flowing in the space 85 between the scroll and the partition plate through the orbiting scroll vent 79B. The three cooling air flows can be reliably separated by the partition plates 72B and 74B. Therefore, the flow of the cooling air can be stably formed with a simple structure using the partition plates 72B and 74B.

  On the other hand, in the compression unit 54A in the low pressure stage, both the fixed scroll 55A and the orbiting scroll 66A can be cooled in series by the flow of one cooling air, as in the first embodiment. The cooling structure for cooling can be simplified.

  In this way, in the twin wrap type scroll type air compressor, for example, in the low pressure stage compressor 54A which is maintained at a relatively low temperature during operation, simplification of the cooling structure can be prioritized, and the high pressure is likely to rise. Since the cooling unit 54B of the stage can prioritize the cooling efficiency, a small and high-performance compressor can be easily realized.

  In each of the above embodiments, the inlets 42A, 42B, 75A, and 75B are formed on the side surfaces in the horizontal direction, and the outlets 43A, 43B, 76A, and 76B are formed on the side surfaces in the vertical direction (upward and downward). The configuration. However, the present invention is not limited to this, and the inflow port and the outflow port may be formed at arbitrary positions that do not interfere with each other. For example, the inflow port is formed on the side surface in the vertical direction (upward and downward), It is good also as a structure which forms an outflow port in the side surface of a horizontal direction.

  Further, in the embodiment, the connecting shaft 23 is inserted into the rotating shaft 18, and the crank portions 24 </ b> A and 24 </ b> B and the rotating shaft 18 on both ends thereof are configured as separate members. However, the present invention is not limited to this, and crank portions are integrally formed on both end sides of the rotating shaft, and the boss portions 29A and 29B of the orbiting scrolls 26A and 26B can be turned on these crank portions via bearings or the like. It is good also as a structure connected to.

  In the embodiment, the cooler 47 made of a twin cooler is provided on the upper side of the casing 1. However, the present invention is not limited to this. For example, the present invention may be applied to a scroll type fluid machine that does not include the cooler 47, and the scroll type fluid machine includes only one of the intercooler and the aftercooler as a cooler. You may apply to.

  Further, in the embodiment, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention is not limited to this, and may be applied to other scroll type fluid machines including a refrigerant compressor for compressing a refrigerant, a vacuum pump, and the like.

1 is an external perspective view showing a scroll type air compressor according to a first embodiment of the present invention. It is the longitudinal cross-sectional view which looked at the air compressor from the arrow II-II direction in FIG. It is a principal part expanded sectional view in FIG. 2 which expands and shows the compression part of a low voltage | pressure stage. It is a principal part expanded sectional view in FIG. 2 which expands and shows the compression part of a high voltage | pressure stage. It is a disassembled perspective view shown in the state before assembling the compression part of a low pressure stage and a high pressure stage. It is a disassembled perspective view shown in the state before assembling a compression part, a cooling fan, a partition plate, etc. of a low voltage | pressure stage. It is an external appearance perspective view which shows the scroll type air compressor by the 2nd Embodiment of this invention. It is the longitudinal cross-sectional view which looked at the air compressor from the arrow VIII-VIII direction in FIG. It is a principal part expanded sectional view in FIG. 8 which expands and shows the compression part of a low voltage | pressure stage. It is a principal part expanded sectional view in FIG. 8 which expands and shows the compression part of a high voltage | pressure stage. It is a disassembled perspective view shown in the state before assembling the compression part of a low pressure stage and a high pressure stage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51 Casing 2,52 Intermediate case 3A, 3B, 53A, 53B Outer case 4A, 4B Fan accommodating part 5A, 5B Scroll accommodating part 6A, 6B, 54A, 54B Compression part 7A, 7B, 55A, 55B Fixed scroll 8A, 8B, 27A, 27B, 56A, 56B, 67A, 67B End plate 9A, 9B, 28A, 28B, 57A, 57B, 68A, 68B Lapping part 12A, 60A Suction port 13A, 13B, 61A, 61B Discharge port 14A, 14B, 62A , 62B Fixed cooling fin 15 Electric motor (electric motor)
18 Rotating shaft 26A, 26B, 66A, 66B Orbiting scroll 30A, 30B, 70A, 70B Orbiting side cooling fin 31A, 31B Compression chamber 38A, 38B, 71A, 71B Cooling fan 40A, 40B, 72A, 72B, 74B Partition plate 41A, 41B, 73A, 73B Opening 42A, 42B, 75A, 75B Inlet 43A, 43B, 76A, 76B Outlet 44A, 44B, 77A, 77B Scroll duct 45A, 45B, 78A, 78B Fixed scroll vent 46A, 46B , 80A, 80B Cooler duct 47 Cooler 79B Orbiting scroll vent (vent)
85 Space between scroll and partition (space)

Claims (8)

A casing having a fan housing portion and the scroll accommodating portion, and a fixed scroll spiral wrap portion on the surface of the end plate provided on the casing is upright, and an electric motor provided in the casing, supported by the casing A rotary shaft that is driven to rotate by the electric motor, and a plurality of compressions that are provided in the scroll housing portion and are connected to the rotary shaft at a position facing the fixed scroll and overlap the lap portion of the fixed scroll on the surface of the end plate. A scroll type fluid machine including a orbiting scroll having a lap portion standing upright to define a chamber;
The rotating shaft is provided with a cooling fan that rotates together with the rotating shaft at a position facing the orbiting scroll in the fan housing portion of the casing ,
Provided in the scroll housing portion, sucking cooling air from the outside, leading the cooling air to the cooling fan via the back side of the end plate of the orbiting scroll, and provided on the side surface of the fan housing portion, An outlet for allowing cooling air sucked from the inlet to flow out to the outside of the fan housing portion by the cooling fan, and a rear surface of the end plate of the fixed scroll provided on the outside of the casing. scroll fluid machine being characterized in that a structure in which Ru and a scroll duct for guiding the side. A casing having a fan housing portion and the scroll accommodating portion, and a fixed scroll spiral wrap portion on the surface of the end plate provided on the casing is upright, and an electric motor provided in the casing, supported by the casing A rotary shaft that is driven to rotate by the electric motor, and a plurality of compressions that are provided in the scroll housing portion and are connected to the rotary shaft at a position facing the fixed scroll and overlap the lap portion of the fixed scroll on the surface of the end plate. A scroll type fluid machine including a orbiting scroll having a lap portion standing upright to define a chamber;
The rotating shaft is provided with a cooling fan that rotates together with the rotating shaft at a position facing the orbiting scroll in the fan housing portion of the casing ,
Provided in the fan housing portion, sucks cooling air from the outside, guides the cooling air to the cooling fan, and provided on a side surface of the fan housing portion, and sucks the cooling air sucked from the inflow port into the cooling fan. An outflow port that flows out to the outside of the fan housing portion , a scroll duct that is provided outside the casing and guides the cooling air that has flowed out from the outflow port to the back side of the end plate of the fixed scroll, and the scroll duct An air vent that circulates a part of the cooling air flowing through the space formed in the back side of the end plate of the orbiting scroll ,
Provided on the outside of the casing is a cooler that cools the gas sucked into the compression chamber or the gas discharged from the compression chamber,
The outlet is formed at two positions of the casing at a position different from the inlet, the scroll duct is connected to one outlet of the outlets, and the cooler is connected to the other outlet. scroll fluid machine being characterized in that a configuration that connects a cooler duct for guiding cooling air. First and second fan housing portion first, first to the casing and a second scroll accommodating portion, spiral wrap portions respectively provided surface of the end plate on both sides of the casing is upright, A second fixed scroll ; an electric motor located in the casing located between the first and second fixed scrolls; a rotary shaft supported by the casing and driven to rotate by the electric motor; and the first , Provided in the second scroll accommodating portion, respectively connected to the rotary shaft at a position facing the first and second fixed scrolls, and overlapped with the wrap portions of the first and second fixed scrolls on the surface of the end plate A scroll type fluid machine including first and second orbiting scrolls each provided with a wrap portion defining a plurality of compression chambers,
On both axial sides of the rotating shaft, first and first rotating together with the rotating shaft at positions facing the first and second orbiting scrolls in the first and second fan accommodating portions of the casing, respectively. 2 cooling fans,
Provided in the first and second scroll housings , sucks cooling air from the outside, and passes the cooling air through the back surfaces of the end plates of the first and second orbiting scrolls. a first, second inlet for guiding the respective cooling fans, the first, is provided on the side surface of the second fan housing portion, said first, said first cooling air sucked from the second inlet, the first by the second cooling fan, and the first and second outlet for flow out respectively to the outside of the second fan housing portion, provided on the outside of said casing, said first, second outlet said leaked cooling air first, scroll fluid machine according to the first, characterized in that a configuration in which Ru and a second scroll duct for guiding each of the back side of the end plate of the second fixed scroll. First and second fan housing portion first, first to the casing and a second scroll accommodating portion, spiral wrap portions respectively provided surface of the end plate on both sides of the casing is upright, A second fixed scroll ; an electric motor located in the casing located between the first and second fixed scrolls; a rotary shaft supported by the casing and driven to rotate by the electric motor; and the first , Provided in the second scroll accommodating portion, respectively connected to the rotary shaft at a position facing the first and second fixed scrolls, and overlapped with the wrap portions of the first and second fixed scrolls on the surface of the end plate A scroll type fluid machine comprising first and second orbiting scrolls each provided with a wrap portion that defines a plurality of compression chambers,
On both axial sides of the rotating shaft, first and first rotating together with the rotating shaft at positions facing the first and second orbiting scrolls in the first and second fan accommodating portions of the casing, respectively. 2 cooling fans,
A first inlet that is provided in the first scroll housing portion and sucks cooling air from the outside and guides the cooling air to the first cooling fan via the back side of the end plate of the first orbiting scroll. And a first flow that is provided on a side surface of the first fan housing portion and causes the cooling air sucked from the first inflow port to flow out of the first fan housing portion by the first cooling fan. An outlet, and a first scroll duct that is provided outside the casing and guides the cooling air flowing out from the first outlet to the back side of the end plate of the first fixed scroll,
Provided in the second fan housing portion, sucked in cooling air from the outside , provided on the side surface of the second fan housing portion, a second inlet for guiding the cooling air to the second cooling fan , A second outlet for allowing the cooling air sucked from the second inlet to flow out of the second fan housing portion by the second cooling fan, and an outer side of the casing . A second scroll duct for guiding the cooling air flowing out from the outlet to the back side of the end plate of the second fixed scroll, and a part of the cooling air provided in the casing and flowing in the second scroll duct the scroll fluid machine being characterized in that a structure in which Ru and a vent for flowing into a space formed on the rear surface side of the end plate of said second orbiting scroll. A partition plate for partitioning the orbiting scroll and the cooling fan is provided inside the casing, the inlet is disposed on the orbiting scroll side with the partition plate interposed therebetween, and the outlet is disposed on the partition plate. The scroll fluid machine according to claim 1 or 3, wherein the scroll fluid machine is configured to be disposed on the side opposite to the inlet. Inside the casing , there is provided one partition plate that partitions the motor and the cooling fan, and another partition plate that partitions the cooling fan and the orbiting scroll, and the inlet is the one partition. It arrange | positions in the said motor side rather than a board, The said outflow port is arrange | positioned between the said one partition plate and the said other partition plate, and the said vent is arrange | positioned in the said scroll scroll side rather than the said other partition plate The scroll type fluid machine according to claim 2 or 4 which comprises as composition. A cooler for cooling the gas sucked into the compression chamber or the gas discharged from the compression chamber is provided outside the casing , and the outlet is formed at two positions of the casing at a position different from the inlet. 1. The structure according to claim 1 , wherein the scroll duct is connected to one of the outlets, and the cooler duct that guides cooling air to the cooler is connected to the other outlet. 5. A scroll fluid machine according to 4.   The inflow port and the outflow port are formed at different positions, and a plurality of swirl-side cooling fins extending along the flow of cooling air flowing from the inflow port are provided on the back surface side of the end plate of the orbiting scroll, and the fixed 5. The scroll type according to claim 1, 2, 3, or 4, wherein a plurality of fixed-side cooling fins extending along a flow of cooling air guided from the outlet to the scroll duct are provided on a rear surface side of the scroll end plate. Fluid machinery.

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