EP1445491A1 - Compresseur avec refroidissement et filtration simultanés du gaz et méthode associée - Google Patents

Compresseur avec refroidissement et filtration simultanés du gaz et méthode associée Download PDF

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Publication number
EP1445491A1
EP1445491A1 EP04002443A EP04002443A EP1445491A1 EP 1445491 A1 EP1445491 A1 EP 1445491A1 EP 04002443 A EP04002443 A EP 04002443A EP 04002443 A EP04002443 A EP 04002443A EP 1445491 A1 EP1445491 A1 EP 1445491A1
Authority
EP
European Patent Office
Prior art keywords
filter
compressor
chamber
cooling
compressed gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04002443A
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German (de)
English (en)
Inventor
Yoshiyuki Nakane
Toshiro Fujii
Tatsuyuki Hoshino
Masahiko Okada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1445491A1 publication Critical patent/EP1445491A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving

Definitions

  • the present invention relates to a compressor that compresses gas to be supplied preferably to a fuel cell, and more particularly to a technique for cooling the gas and removing foreign substances in the gas, such as abrasion powder, from the gas.
  • a cooling chamber is disposed adjacent to a compression chamber, and a gas cooler that has a gas passage leading to a discharge port is arranged adjacent to the cooling chamber. Therefore, heat is exchanged between coolant fluid in the cooling chamber and the discharged gas in the gas passage so that the discharged gas is cooled while the discharged gas passes through the gas passage.
  • Japanese unexamined Patent Publication No. 2000-213831 discloses a technique in which a filter is provided in a conduit for collecting the abrasion powder in the gas that flows in the conduit.
  • the above filter collects abrasion powder that is produced in the compressor and that is discharged to the outside of the compressor with the gas so as to prevent the abrasion powder from flowing into the downstream device.
  • there is a limit to enlarge a cross section of a filter passage Because of the small cross-sectional area, the filter is easily clogged, and the compression pressure is reduced.
  • the present invention provides a technique to effectively cool gas and to simultaneously remove foreign substances from the gas in a compressor before the discharged gas from a discharge port flows out to an external circuit.
  • a scroll type compressor includes a fixed scroll member and a movable scroll member to define compression chambers.
  • the movable scroll member orbits relative to the fixed scroll member to compress gas in the compression chambers.
  • the compressed gas is discharged to a discharge port.
  • the compressor also includes a filter chamber and a cooling chamber.
  • the filter chamber communicates with the discharge port for accommodating a first filter to at least partially filter the compressed gas.
  • the cooling chamber is located adjacent to the filter chamber for containing coolant fluid that cools the compressed gas in the filter chamber.
  • the present invention also provides a method of processing compressed gas in a compressor.
  • the compressor forms a compression chambers for compressing the gas, a filter chamber having a filter and a cooling chamber that is located adjacent to the filter chamber for containing coolant fluid.
  • the method includes the steps of transmitting cooling temperature of the coolant fluid to the filter chamber, cooling the compressed gas in the filter chamber and removing foreign substances in the compressed gas through the filter in the filter chamber simultaneously with the above cooling step.
  • the present invention also provides a compressor for compressing gas.
  • the compressor includes a filter chamber and a cooling chamber.
  • the filter chamber accommodates a filter so as to at least partially filter the compressed gas.
  • the cooling chamber is located adjacent to the filter chamber for containing coolant fluid so that cooling temperature of the coolant fluid is transmitted to the filter chamber.
  • the present invention also provides a cooling circuit for cooling gas in a compressor that compresses the gas.
  • the cooling circuit includes a filter chamber, a cooling chamber, a heat exchanger and a pump.
  • the filter chamber is located in the compressor and accommodates a filter to filter at least partially the compressed gas.
  • the cooling chamber is located in the compressor adjacent to the filter chamber for passing coolant fluid.
  • the heat exchanger is connected to the cooling chamber for cooling the coolant fluid from the cooling chamber.
  • the pump connected to the heat exchanger for supplying the coolant fluid to the cooling chamber.
  • FIG. 1 is a longitudinal cross-sectional view of a scroll type electric compressor 10 according to the first preferred embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the compressor 10 taken along the line II-II in FIG. 1.
  • FIG. 3 is a perspective view of a filter. The left and right sides of FIG. 1 respectively correspond to the front and rear sides of the compressor 10.
  • the front housing 11 includes a fixed scroll member 20, a filter casing 41 and a support housing 21.
  • the filter casing 41 is fixedly joined to the front end of the fixed scroll member 20.
  • the support housing 21 is fixedly joined to the rear end of the fixed scroll member 20 and to the front end of the rear housing 12.
  • the fixed scroll member 20 includes a fixed base plate 20a that has a substantially disc-shaped configuration and a fixed spiral wall 20b that extends from the rear surface of the fixed base plate 20a.
  • a crankshaft 17 is provided at the front end of the rotary shaft 13 and is offset from an axis L of the rotary shaft 13 by a predetermined length E of eccentricity.
  • a movable scroll member 24 is rotatably supported by the crankshaft 17 through a pair of bearings 25 so as to face the fixed scroll member 20.
  • the movable scroll member 24 includes a movable base plate 24a that is substantially disc-shaped and a movable spiral wall 24b that extends from the front surface of the movable base plate 24b.
  • a boss 24d is formed at the intermediate portion of the movable base plate 24a of the movable scroll member 24.
  • the boss 24d axially protrudes toward the front side of the compressor 10.
  • An inserting recess 24e is formed in the boss 24d for accepting the crankshaft 17 thereinto.
  • a bottom wall 24f of the boss 24d is formed at the front side opposite to an opening and rear side where the crankshaft 17 is inserted.
  • the crankshaft 17 protrudes from the movable base plate 24a toward the fixed base plate 20a. Consequently, the compressor 10 is shortened along the axis L of the rotary shaft 13 by a partial length of the crankshaft 17 that protrudes from the movable base plate 24a toward the fixed base plate 20a.
  • a discharge port 20d is formed in the center of the fixed base plate 20a of the fixed scroll member 20.
  • a suction port 20e is formed in the outer circumferential wall of the fixed scroll member 20.
  • a self-rotation preventing mechanism 31 includes a crankshaft 27 and bearings 28 and 29. The self-rotation preventing mechanism 31 is located between the movable base plate 24a of the movable scroll member 24 and the inner wall surface of the support housing 21 that faces the movable base plate 24a of the movable scroll member 24.
  • the movable scroll member 24 orbits around the axis of the fixed scroll member 20 by the crankshaft 17.
  • the self-rotation preventing mechanism 31 prevents the movable scroll member 24 from self-rotating while it allows the movable scroll member 24 to orbit around the axis of the fixed scroll member 20.
  • the compression chambers 26 move inwardly from an outer circumferential side of the fixed and movable spiral walls 20b and 24b by the orbital movement, the compression chambers 26 reduce in volume. Thereby, the air introduced from the suction port 20e into the compression chambers 26 is compressed. The compressed air is discharged from the compression chambers 26 to a filter chamber 44 through the discharge port 20d when the compression chambers 26 have approached the center of the fixed base plate 20a.
  • a cooling chamber 32 is defined between the front surface of the fixed scroll member 20 and the filter casing 41, the filter casing 41 is fixed to the fixed scroll member 20.
  • a recess 32c is formed at the front side of the fixed base plate 20a of the fixed scroll member 20, and the filter casing 41 is fixed to the front surface of the fixed base plate 20a so as to cover the recess 32c. Accordingly, the cooling chamber 32 is adjacent to the compression chambers 26 across the fixed base plate 20a.
  • the cooling chamber 32 is formed in a substantially U-shaped manner so as to surround the discharge port 20d.
  • the cooling chamber 32 has a coolant inlet 32a for flowing cooling water as coolant fluid into the cooling chamber 32 and a coolant outlet 32b for removing the cooling water.
  • a plurality of flow-dividing fins 33 is provided in the cooling chamber 32.
  • the flow-dividing fins 33 divide the flow of the cooling water flowing in from the coolant inlet 32a, and the cooling water flows toward the coolant outlet 32b.
  • the flow-dividing fins 33 extend from the front surface of the fixed base plate 20a of the fixed scroll member 20.
  • the cooling chamber 32 partially constitutes a cooling circuit. As shown in FIG.
  • a heat exchanger and a pump are provided in the cooling circuit.
  • the heat exchanger cools the high-temperature cooling water that flows out from the coolant outlet 32b.
  • the pump supplies the cooling water that has been cooled into the cooling chamber 32 through the coolant inlet 32a. Pure water generated by cell reaction at a fuel cell FC as shown in FIG. 1 is utilized as the cooling water that circulates in the cooling circuit.
  • the filter casing 41 has a two-part structure including an inner casing 41a at the rear side and an outer casing 41b at the front side.
  • the inner casing 41a is fixed to the front surface of the fixed scroll member 20 by a predetermined number of bolts 42 while the outer casing 41b is fixed to the inner casing 41a by a predetermined number of bolts 43.
  • the outer casing 41b is detachable from the inner casing 41a.
  • the outer casing 41b is detached from the inner casing 41a.
  • the inner and outer casings 41a and 41b define the filter chamber 44.
  • the filter chamber 44 is adjacent to the cooling chamber 32 across the inner casing 41a. Namely, the cooling chamber 32 is located between the compression chambers 26 and the filter chamber 44.
  • the inner casing 41 a contacts the flow-dividing fins 33.
  • the filter chamber 44 accommodates a filter 45 for removing foreign substances when the compressed air is introduced from the discharge port 20d into the filter chamber 44.
  • the filter 45 includes a filter portion 45a for removing the foreign substances and a frame 45b arranged around the edges of the filter portion 45a for supporting the filter portion 45a.
  • the filter 45 is schematically illustrated in FIG. 3.
  • the frame 45b preferably includes a rib 45c for reinforcing.
  • the filter portion 45a is preferably a pleated type filter element that has been formed by bending a flat stainless screen in zigzags.
  • the filter 45 is supported in such a manner that the filter 45 is sandwiched by the inner and outer casings 41a and 41b. As shown in FIG. 1, the filter portion 45a is suspended in the filter chamber 44.
  • a communication hole 41c is formed as an inlet in the center of the inner casing 41a.
  • the filter chamber 44 communicates with the discharge port 20d of the compression chamber 26 through the communication hole 41c.
  • An outlet 41d is formed in the center of the outer casing 41b. That is, the compressed air discharged from the discharge port 20d of the compression chamber 26 is inputted to the filter chamber 44 through the communication hole 41c. After passing through the filter 45, the compressed air is outputted through the outlet 41d to the fuel cell FC, which is located outside of the compressor 10.
  • the compressed air flows in the filter chamber 44 substantially in the same direction as the compressed air flows in the discharge port 20d as shown by an arrow in FIG. 1. Also, the filter 45 is located so as to be perpendicular to the above flow direction.
  • the cooling water flows into the cooling chamber 32 from the coolant inlet 32a.
  • the cooling water flowing into the cooling chamber 32 cools the air that is being compressed in the compression chambers 26 and the discharged air in the filter chamber 44. Namely, heat is exchanged between the cooling water in the cooling chamber 32 and the compressed air in the compression chambers 26 through the fixed base plate 20a as well as between the cooling water and the compressed gas in the filter chamber 44 through the inner casing 41a. More specifically, cooling temperature of the cooling water is transmitted to the compressed air in the compression chambers 26 through the fixed base pate 20a as well as the compressed gas in the filter chamber 44 through the inner casing 41a.
  • the cooling water that has been used for cooling flows out from the coolant outlet 32b and is substantially cooled by the heat exchanger to circulate back into the cooling chamber 32 by the pump. Namely, as the cooling water circulates in the cooling circuit, the temperature of the cooling water repeatedly rises and lowers. A part of the cooling water that flows out from the coolant outlet 32b is discarded, and the same amount of the pure water generated at the fuel cell FC is added into the cooling circuit for the discarded part.
  • the movable spiral wall 24b rotates relative to the fixed spiral wall 20b while the movable spiral wall 24b contacts the fixed spiral wall 20b. That is, the movable spiral wall 24b slides over the fixed spiral wall 20b. Also, the tip seals 20c and 24c respectively slide over the movable and fixed base plate 24a and 20a. Thereby, sliding surfaces abrade to produce abrasion powder.
  • the abrasion powder is mixed in the compressed air and is sent to the filter chamber 44 through the discharge port 20d and the communication hole 41c. When the discharged air passes through the filter 45 in the filter chamber 44, the filter 45 collects the abrasion powder in the discharged air and the discharged air is cooled substantially at the same time.
  • the cooling water in the cooling chamber 32 cools the discharged air.
  • the filtered air having a low temperature is outputted to the outside or an external circuit of the compressor 10 from the outlet 41d.
  • the filter chamber 44 accommodating the filter 45 is formed in the compressor 10 and is adjacent to the cooling chamber 32. Accordingly, since cleaning and cooling of the discharged air are simultaneously conducted in one space, the space is efficiently and logically utilized. Also, since the cooling chamber 32 is adjacent to the compression chambers 26, cooling action is applied to the compressed air in the compression chambers 26 and the filter chamber 44. Accordingly, the compressed air is effectively cooled.
  • the filter chamber 44 is formed in the compressor 10.
  • a conduit in the external circuit is generally not large enough in diameter for efficient circulation.
  • a filter area size is limited to a small cross-sectional area of the conduit in the external circuit. No significant limitation is applicable for the cross-sectional size in the present preferred embodiment since the filter is in the compressor.
  • the filter 45 is enlarged in the preferred embodiment in an orthogonal direction relative to the compressed air flow direction in which the compressed air flows in the filter chamber 44. Based on this design, the area of the filter 45 is substantially larger than that in the external circuit, and the capacity for collecting the foreign substances is also substantially enhanced. Consequently, since a flow rate of the air is reduced due to the large area, cooling time of the compressed air in the filter chamber 44 is longer, and a strong cooling effect is obtained.
  • the filter casing 41 has the two-part structure including the inner and outer casings 41a and 41b.
  • the inner casing 41a is fixed to the fixed scroll member 20, and the outer casing 41b is detachably fixed to the inner casing 41a. Since the outer casing 41b is detached from the inner casing 41a as necessary, the filter 45 in the filter chamber 44 is easily replaced or cleaned.
  • the filter casing 41 is connected to the fixed scroll member 20 so as to provide the filter chamber 44.
  • a filter casing is newly placed to a housing so that a filter chamber is newly provided for the existing compressor. Therefore, the above simple design change enables the existing scroll type electric compressor to cool air and remove foreign substances.
  • a plurality of the flow-dividing fins 33 is provided in the cooling chamber 32 and protrudes from the fixed base plate 20a of the fixed scroll member 20.
  • the flow-dividing fins 33 contact the inner casing 41a.
  • FIG. 4 is a partially enlarged cross-sectional view of a scroll type compressor according to the second preferred embodiment of the present invention.
  • an additional filter 55 is added in the filter chamber 44 on an upstream side, that is, a rear side as indicated in the right in FIG 4 relative to the filter 45 of the above-described first preferred embodiment.
  • the two filters 45 and 55 are located along the compressed air flow direction.
  • the filter 55 located at the upstream side and the filter 45 located at a downstream side or the front side are respectively referred to as a first filter and a second filter. Since the second filter 45 has substantially the same structure as in the first preferred embodiment, the description for the second filter 45 is omitted.
  • the first filter 55 includes a filter portion 55a for removing the foreign substances and a frame 55b arranged around the edges of the filter portion 55a for supporting the filter portion 55a.
  • the frame 55b preferably includes a rib 55c for reinforcing.
  • the filter portion 55a is preferably a pleated type filter element that a flat stainless screen is bent in zigzags as similarly done to the filter portion 45a of the second filter 45 as described with respect to FIG. 3.
  • filter elements made of material such as steel, aluminum alloy, resin and fabric are also used for either of the first and second filter portions 55a and 45a.
  • the first and second filter portions 55a and 45a have a micro structure or a mesh in which circular or square pores are formed in a plate material.
  • a mesh size M1 of the first filter 55 and a mesh size M2 of the second filter 45 preferably satisfy the following inequality.
  • the mesh size is determined by the number of mesh openings in a square inch. M1 ⁇ M2
  • the mesh size M1 of the first filter 55 is smaller than the mesh size M2 of the second filter 45. More precisely, the mesh size of the first filter portion 55a in the first filter 55 ranges from 25 to 40 while the mesh size of the second filter portion 45a in the second filter 45 is approximately 100.
  • a receiving area A1 of the filter portion 55a and a receiving area A2 of the filter portion 45a preferably satisfy the following inequality.
  • the receiving area of the filter in the present specification means the area of the filter portion that receives the compressed air. A1 ⁇ A2
  • the receiving areas A1 and A2 of the first and second filters 55 and 45 satisfy the following inequality: A1 ⁇ A2
  • the receiving area A1 of the first filter 55 on the upstream side is smaller than the receiving area A2 of the second filter 45 on the downstream side.
  • the foreign substances such as the abrasion powder mixed in the compressed air are collected by the first and second filters 55 and 45 in a sequential manner so that the compressed air is cleaned through two filters over a longer period of time. Also, as the air flowing in the filer chamber 44 passes through the two filters 55 and 45, the flow rate of the air is further reduced. Therefore, the compressed air is effectively cooled.
  • the escape passage 56 is formed so that the compressed air bypasses the first filter 55.
  • the escape passage 56 includes the space between the first filter 55 and the inner casing 41 a as indicated by "X" in FIG. 5. If the first filter 55 is clogged, the compressed air bypasses the first filter 55 through the escape passage 56. Consequently, the pressure loss due to the clogged filter is prevented or reduced.
  • the compressor 10 effectively performs. In this regard, life of the scroll compressor 10 is extended. As described above, not only the foreign substances such as the abrasion powder mixed in the compressed air are substantially collected but also the temperature is substantially lower in the compressed air that is discharged from the outlet 41d of the filter chamber 44.
  • the escape passage 56 are formed so as to bypass the first filter 55 that is located on the upstream side.
  • the first filter 55 the foreign substances in the compressed air are eventually collected by the second filter 45 on the downstream side. Consequently, the foreign substances such as the abrasion powder mixed in the compressed air are effectively collected.
  • the second filter 45 is clogged, the first and second filters 55 and 45 are replaced or cleaned. Without replacement or cleaning, the amount of clogged material on the second filter 45 is one indication of remaining life of the compressor 10.
  • the first and second filters 55 and 45 are located so as to face the discharge port 20d.
  • the compressed air discharged from the discharge port 20d effectively passes through the two filters 55 and 45. Consequently, the foreign substances such as the abrasion powder mixed in the compressed air are effectively collected.
  • the two filters 55 and 45 are compactly installed in the compressor 10.
  • the second filter 45 is located on the downstream side with respect to first filter 55, and an escape passage is not formed at the second filter 45.
  • the foreign substances in the compressed air are eventually collected by the second filter 45. It is possible to avoid the flow of the foreign substances to the external circuit of the compressor 10 due to the insufficient cleaning which is expected when the compressed air supposedly bypasses the second filter 45.
  • the shapes of the first and second filters 55 and 45 are circular in the above-described preferred embodiments. However, the outer shapes of the first and second filters 55 and 45 are changed.
  • the shape of at least one of the first and second filters 55 and 45 is substantially rectangular as shown in FIG. 6.
  • the shape of at least one of the first and second filters 55 and 45 is substantially semicircular as shown in FIG. 7.
  • the filter 55 or 45 has a substantially rectangular shape, and the shape of the filter portion 55a or 45a is different from the shape of the frame 55b or 45b in a third alternative embodiment.
  • the filter portion 55a or 45a avoids holes H1 for inserting bolts and a hole H2 that leads to the coolant inlet 32a or the coolant outlet 32b of the cooling chamber 32 as shown in FIG 2, which are formed in the frame 55b or 45b.
  • the first and second filters 55 and 45 have planar shapes in the above-described preferred embodiment. However, in a fourth alternative embodiment, the first and second filters 55 and 45 have substantially hemispherical shapes as shown in FIG. 9.
  • the first filter 55 is connected to the inner casing 41a of the filter casing 41 in the above-described second preferred embodiment. However, as shown in FIG. 10, the first filter 55 is connected to the frame 45b of the second filter 45 in a fifth alternative embodiment.
  • the end portion of each mounting portion 55d of the frame 55b of the first filter 55 is similarly fixed to the frame 45b of the second filter 45 by a bolt that is not shown in the drawings as the above description.
  • the filter portion 55a of the first filter 55 is suspended in the filter chamber 44, and a part of the escape passage 56 is formed between the frame 55b of the first filter 55 and the inner casing 41a.
  • the frame 45b of the second filter 45 and the frame 55b of the first filter 55 are sandwiched between the inner and outer casings 41a and 41b in a sixth alternative embodiment.
  • the frame 45b of the second filter 45 and the frame 55b of the first filter 55 are supported.
  • a ring-shaped spacer 50 is interposed between the first filter frame 55b and the second filter frame 45b. Therefore, an interval is maintained between the first and second filters 55 and 45.
  • an escape passage 56 includes through holes that are formed in the first filter frame 55b.
  • the spacer 50 is formed integrally with either of the first filter frame 55b or the second filter frame 45b, and the number of components is reduced.
  • an escape passage 56 at the first filter 55 is formed so as to be opened and closed by an open-close means in a seventh alternative embodiment.
  • the open-close means closes the escape passage 56 when the compressed air pressure on the upstream side relative to the first filter 55 is smaller than a predetermined pressure.
  • the open-close means opens the escape passage 56 when the compressed air pressure on the upstream side relative to the first filter 55 is equal to or larger than the predetermined pressure.
  • a support member 58 is arranged at the inner casing 41a.
  • the support member 58 includes a fixed support portion 58a that has a ring shape and a plurality of movable support portions 58b that extends from the fixed support portion 58a.
  • the first filter 55 when the first filter 55 is clogged and the compressed air pressure on the upstream side relative to the first filter 55 is equal to or more than the predetermined pressure, the first filter 55 is forced to move against the urging of the elastic member 59 to open the escape passage 56 at a position as shown by the double-dotted line in FIG. 12. Thereby, the compressed air bypasses the first filter 55 through the opened escape passage 56. Consequently, the pressure loss due to the clogging of the first filter 55 is substantially prevented or reduced. As described above, even though the first filter 55 is clogged, the compressor 10 effectively performs without cleaning or replacing the clogged filter 55. Thus, the life of the scroll compressor 10 is extended beyond the point when the first filter 55 is clogged.
  • the first filter 55 Since the first filter 55, the support member 58 and the elastic member 59 constitute the open-close means according to the present invention as described above, the first filter 55 effectively functions as a valve body. Meanwhile, instead of the above open-close means, another alternative embodiment utilizes a known escape valve at an escape passage in the filter casing 41 for bypassing the first filter 55.
  • an escape passage is similarly formed so as to be opened and closed by an open-close means as in the above first filter 55.
  • the open-close means usually closes the escape passage while the open-close means opens the escape passage when the pressure of the compressed air on the upstream side relative to the second filter 45 is equal to or larger than a predetermined pressure.
  • the recess 32c is formed in the fixed base plate 20a of the fixed scroll member 20 for defining the cooling chamber 32 in the above-described preferred embodiments.
  • the recess 32c is formed in the inner casing 41a of the filter casing 41, or in both the fixed base plate 20a and the inner casing 41a.
  • an additional cooling chamber is defined on the front side of the filter casing 41 for cooling the discharged air in the filter chamber 44 from both the front side and the rear side of the filter chamber 44.
  • the flow-dividing fins 33 are formed in the cooling chamber 32. However, in an eleventh alternative embodiment, the flow-dividing fins 33 are formed on the rear side of the inner casing 41a of the filter casing 41, or are omitted.
  • the above-described preferred embodiments apply to the compressor for compressing the gas, more particularly the air, which is supplied to the fuel cell FC of the electric vehicle.
  • the present invention is applied to a compressor in an air conditioner or a refrigerating device.
  • the two filters 55 and 45 in the second preferred embodiment are located. However, in a thirteenth alternative embodiment, three filters or more are located along the flow direction of the gas. An escape passage is formed so as to bypass at least one of the filters. Also, the first and second filters 55 and 45 are located so as to be offset from the discharge port 20d and do not face the discharge port 20d.
  • the present invention is applied to a scroll type compressor.
  • the present invention is also applied to other type compressors.
  • a scroll type compressor includes a fixed scroll member and a movable scroll member to define compression chambers.
  • the movable scroll member orbits relative to the fixed scroll member to compress gas in the compression chambers.
  • the compressed gas is discharged to a discharge port.
  • the compressor also includes a filter chamber and a cooling chamber.
  • the filter chamber communicates with the discharge port for accommodating a first filter to at least partially filter the compressed gas.
  • the cooling chamber is located adjacent to the filter chamber for containing coolant fluid that cools the compressed gas in the filter chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Compressor (AREA)
EP04002443A 2003-02-05 2004-02-04 Compresseur avec refroidissement et filtration simultanés du gaz et méthode associée Withdrawn EP1445491A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2003028401 2003-02-05
JP2003028401 2003-02-05
JP2003063608A JP2004293295A (ja) 2003-02-05 2003-03-10 スクロール型圧縮機とその圧縮機におけるガスの冷却方法及び浄化方法
JP2003063608 2003-03-10

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EP1445491A1 true EP1445491A1 (fr) 2004-08-11

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EP (1) EP1445491A1 (fr)
JP (1) JP2004293295A (fr)

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US11047389B2 (en) 2010-04-16 2021-06-29 Air Squared, Inc. Multi-stage scroll vacuum pumps and related scroll devices
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