EP3477113A1 - Compresseur à spirale - Google Patents

Compresseur à spirale Download PDF

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Publication number
EP3477113A1
EP3477113A1 EP16907249.3A EP16907249A EP3477113A1 EP 3477113 A1 EP3477113 A1 EP 3477113A1 EP 16907249 A EP16907249 A EP 16907249A EP 3477113 A1 EP3477113 A1 EP 3477113A1
Authority
EP
European Patent Office
Prior art keywords
valve body
hole
injection port
compression chamber
refrigerant
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Withdrawn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
EP16907249.3A
Other languages
German (de)
English (en)
Other versions
EP3477113A4 (fr
Inventor
Junpei MIZOBATA
Koichi FUKUHARA
Shuhei Koyama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3477113A4 publication Critical patent/EP3477113A4/fr
Publication of EP3477113A1 publication Critical patent/EP3477113A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • 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
    • F04C2210/00—Fluid
    • F04C2210/22—Fluid gaseous, i.e. compressible
    • F04C2210/222—Carbon dioxide (CO2)
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • 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
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating

Definitions

  • the present invention relates to a scroll compressor configured to compress fluid, and more particularly, to a scroll compressor capable of injecting (charging) fluid to be compressed into a compression chamber.
  • a scroll compressor configured to inject fluid to be compressed into a compression chamber when compression is being performed, that is, before the compression chamber communicates with a discharge port.
  • a check valve configured to prevent a reverse flow of the fluid from the compression chamber.
  • a related-art scroll compressor for which reduction in dead volume is attained (for example, see Patent Literature 1).
  • a base plate portion of a fixed scroll has an injection port penetrating from an outer surface into a compression chamber substantially in a wall-thickness direction.
  • a block to which an injection pipe is connected is placed in contact with a portion of the outer surface corresponding to the injection port of the base plate portion of the fixed scroll, thereby defining check valve chambers across the block from each other.
  • a valve seat holding a lead valve configured to open and close, from an inner side, an introduction port of the block from the injection pipe is interposed between the base plate portion of the fixed scroll and the block.
  • a valve stopper for a lead valve is provided at a portion of the check valve chamber.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 11-107950
  • the lead valve be capable of opening and closing the introduction port of the block from the injection pipe, and that the valve seat be installed at a position at which the lead valve can be held in contact with the valve stopper to interpose the valve seat between the base plate portion of the fixed scroll and the block. Consequently, the scroll compressor described in Patent Literature 1 has a problem in that assembly is difficult because it is required that the valve seat be installed with use of a positioning jig.
  • the present invention has been made to solve the problem described above, and has an object to obtain a scroll compressor capable of injecting fluid into a compression chamber, and is capable of reducing dead volume and achieving easy assembly.
  • a scroll compressor including a fixed scroll including a first base plate portion and a first spiral blade formed on one surface of the first base plate portion, an orbiting scroll including a second base plate portion and a second spiral blade formed on a surface of the second base plate portion facing the fixed scroll, defining a compression chamber by combination of the first spiral blade and the second spiral blade, and configured to perform an orbiting motion against the fixed scroll, a first through hole penetrating through the first base plate portion to communicate with the compression chamber, a fixing part provided on a surface of the first base plate portion that is opposite to the orbiting scroll to cover the first through hole and having an injection port communicating with the first through hole, an injection pipe being connected to the injection port, a valve body inserted into the first through hole in such a manner that the valve body is configured to reciprocate, and a spring inserted into the first through hole and configured to urge the valve body toward the injection port.
  • a flow passage is formed in the valve body or between the valve body and the first through hole and the flow passage is configured to allow refrigerant having flowed into the first through hole from the injection port to flow out to the compression chamber.
  • the valve body is configured to close the flow passage between the injection port and the compression chamber when the valve body is urged by the spring to move toward the injection port.
  • the valve body and the spring act as a check valve configured to prevent a reverse flow of fluid from the compression chamber to the injection port.
  • the valve body and the spring are provided in the first through hole opened in the first base plate portion of the fixed scroll. Consequently, the scroll compressor according to an embodiment of the present invention is capable of reducing dead volume.
  • the valve body and the spring can be assembled by only inserting the valve body and the spring into the first through hole. Consequently, the scroll compressor according to an embodiment of the present invention can easily be assembled.
  • Fig. 1 is a schematic vertical sectional view of a scroll compressor according to Embodiment 1 of the present invention.
  • a flow of refrigerant in a normal compression step is indicated by solid-line thick arrows, and a flow of refrigerant under injection control is indicated by broken-line thick arrows.
  • a flow of refrigerant under injection control is indicated by broken-line thick arrows.
  • hatching on cross sections of some parts is omitted.
  • the scroll compressor 1 is a fluid machine configured to compress and discharge fluid (for example, refrigerant).
  • the scroll compressor 1 is one of components of a refrigeration cycle apparatus to be used for various industrial machines such as a refrigerator, a freezer, an automatic vending machine, a refrigeration apparatus, and a water heater.
  • a scroll compressor of a vertical installation type in which a main shaft 2 is provided along a vertical direction.
  • dimensional relationships and shapes of the components are different from those of actual components in some cases.
  • the scroll compressor 1 includes a compression mechanism part 3 and a drive mechanism part 4 configured to drive the compression mechanism part 3.
  • the compression mechanism part 3 and the drive mechanism part 4 are accommodated in a shell 5 that is a pressure container (hermetic container).
  • a bottom portion of the shell 5 serves as an oil reservoir configured to store refrigerating machine oil.
  • a suction pipe 6 and a discharge pipe 7 are connected to the shell 5.
  • the suction pipe 6 is configured to allow refrigerant to be sucked into the shell 5.
  • the discharge pipe 7 is configured to allow the compressed refrigerant to be discharged to an outside of the shell 5.
  • the compression mechanism part 3 When the compression mechanism part 3 is driven by the drive mechanism part 4, the compression mechanism part 3 performs a function of compressing refrigerant gas sucked through the suction pipe 6 in a compression chamber 8, and discharging the compressed refrigerant gas to a discharge space 10 inside the shell 5 through a discharge port 9.
  • the discharge space 10 is provided in an upper space inside the scroll compressor 1, and is a high-pressure space.
  • the refrigerant gas having been discharged to the discharge space 10 is discharged to the outside of the scroll compressor 1 after passing through the discharge pipe 7 from the discharge space 10.
  • the compression mechanism part 3 includes a fixed scroll 20 and an orbiting scroll 26.
  • the fixed scroll 20 is fixed to a frame 11 mounted to the shell 5.
  • the orbiting scroll 26 is configured to orbit (that is, perform a revolving motion) against the fixed scroll 20.
  • the fixed scroll 20 includes a base plate portion 21 and a spiral blade 22.
  • the spiral blade 22 is a projection that is formed on one surface (lower surface in Fig. 1 ) of the base plate portion 21 and has an involute curve shape.
  • the orbiting scroll 26 includes a base plate portion 27 and a spiral blade 28.
  • the spiral blade 28 is a projection that is formed on one surface (upper surface in Fig. 1 ) of the base plate portion 27 and has an involute curve shape.
  • the fixed scroll 20 and the orbiting scroll 26 are combined so that the spiral blades 22 and 28 are held in mesh with each other. With this configuration, between the spiral blade 22 and the spiral blade 28, there is defined the compression chamber 8 relatively changed in volume to compress the refrigerant.
  • the base plate portion 21 corresponds to a first base plate portion of the present invention.
  • the spiral blade 22 corresponds to a first spiral blade of the present invention.
  • the base plate portion 27 corresponds to a second base plate portion of the present invention.
  • the spiral blade 28 corresponds to a second spiral blade of the present invention.
  • the discharge port 9 configured to allow the high-pressure refrigerant gas having been compressed in the compression chamber 8 to be discharged.
  • a through hole 12 configured to allow the refrigerant to be injected into the compression chamber.
  • the through hole 12 penetrates through the base plate portion 21 at a position of communicating with the compression chamber 8 at a time before the compression chamber 8 communicates with the discharge port 9.
  • a valve body 23 having a block shape and a spring 24 configured to urge the valve body 23 toward the injection port 130 are inserted into the through hole 12.
  • valve body 23 and the spring 24 act as a check valve configured to allow a flow of refrigerant flowing from the injection port 130 into the compression chamber 8 through the through hole 12 and to regulate a flow in the reverse direction. Details of the through hole 12, the valve body 23, and the spring 24 are described later with reference to Figs. 2 and Figs. 3 .
  • the through hole 12 corresponds to a first through hole of the present invention.
  • a portion of the compression chamber 8 is defined between an inward surface of the spiral blade 22 of the fixed scroll 20 and an outward surface of the spiral blade 28 of the orbiting scroll 26, and another portion of the compression chamber 8 is defined between an outward surface of the spiral blade 22 of the fixed scroll 20 and an inward surface of the spiral blade 28 of the orbiting scroll 26.
  • the scroll compressor 1 according to Embodiment 1 has two through holes 12 in the base plate portion 21 of the fixed scroll 20.
  • a chamber 13 is fixed to a surface (upper surface in Fig. 1 ) of the base plate portion 21 of the fixed scroll 20 that is opposite to the surface having the spiral blade 22 formed on the surface by, for example, a bolt to cover the through holes 12.
  • the chamber 13 has the injection port 130 communicating with the through holes 12.
  • the injection port 130 includes an inflow port 131 and outflow ports 132.
  • An injection pipe 14 is connected to the inflow port 131.
  • One of the outflow ports 132 allows a corresponding one of the inflow ports 131 and a corresponding one of the through holes 12 of the base plate portion 21 of the fixed scroll 20 to communicate with each other.
  • the injection port 130 includes two outflow ports 132 each provided to a corresponding one of two through holes 12.
  • the two outflow ports 132 communicate with the inflow port 131 through a connection hole 133.
  • the injection pipe 14 is connected to the injection port 130 with use of a joint 14a.
  • the injection pipe 14 may be directly connected to the injection port 130.
  • the chamber 13 corresponds to a fixing part of the present invention.
  • the other end of the injection pipe 14 is connected to, for example, a liquid receiver provided to the refrigerant cycle. Liquid refrigerant in the liquid receiver is injected (charged) into the compression chamber 8 through the injection pipe 14, the injection port 130 of the chamber 13, and the through holes 12 of the fixed scroll 20. Whether or not to allow the refrigerant to flow through the injection pipe 14 is switched by, for example, an electromagnetic valve. The amount of refrigerant flowing through the injection pipe 14 may be adjusted with use of a capillary tube to thereby adjust the injection amount of the refrigerant to the compression chamber 8.
  • a discharge port 134 penetrating through the chamber 13 is formed at a position facing the discharge port 9 of the base plate portion 21 of the fixed scroll 20.
  • a lead valve 15 configured to close the discharge port 134 and a lead valve pressing part 16 configured to regulate a maximum opening degree of the lead valve 15 are mounted to the chamber 13. That is, the refrigerant gas having been compressed in the compression chamber 8 passes through the discharge port 9 of the fixed scroll 20 and the discharge port 134 of the chamber 13, and pushes up the lead valve 15 to be discharged to the discharge space 10.
  • the chamber 13 may be manufactured by separately preparing a fixing part having the discharge port 134 and a fixing part having the injection port 130 described above.
  • a boss portion 29 having a hollow cylindrical shape.
  • An eccentric shaft portion 2a provided at one end of the main shaft 2 described later is inserted into the boss portion 29 in such a manner that the eccentric shaft portion 2a is surrounded by an inner periphery of the boss portion 29 and the eccentric shaft portion 2a is configured to rotate and slide in the boss portion 29.
  • the Oldham's joint 17 is provided between the orbiting scroll 26 and the frame 11.
  • the Oldham's joint 17 includes a ring portion, a pair of Oldham's keys formed on an upper surface of the ring portion, and a pair of Oldham's keys formed on a lower surface of the ring portion.
  • the Oldham's keys formed on the upper surface are inserted into key grooves formed in the orbiting scroll 26, and are each configured to slide in one direction.
  • the Oldham's keys formed on the lower surface are inserted into key grooves formed in the frame 11, and are each configured to slide in a direction crossing the one direction. With this configuration, the orbiting scroll 26 performs a revolving motion (orbiting motion) without rotating on its own axis.
  • the drive mechanism part 4 has a function of driving the orbiting scroll 26 to compress the refrigerant gas by the compression mechanism part 3. That is, when the drive mechanism part 4 drives the orbiting scroll 26 through intermediation of the main shaft 2, the refrigerant gas is compressed by the compression mechanism part 3.
  • the drive mechanism part 4 includes a stator 18 and a rotor 19.
  • the stator 18 is fixed to an inner periphery of the shell 5.
  • the rotor 19 is placed in such a manner that the rotor 19 is surrounded by an inner periphery of the stator 18.
  • the main shaft 2 is fixed to the rotor 19, for example, by press-fitting. That is, when the stator 18 is energized, the rotor 19 rotates integrally with the main shaft 2.
  • the eccentric shaft portion 2a is formed at one end of the main shaft 2.
  • the eccentric shaft portion 2a is inserted into the boss portion 29 of the orbiting scroll 26 in such a manner that the eccentric shaft portion 2a is configured to rotate and slide in the boss portion 29.
  • an oil-feeding flow passage serving as a flow passage for feeding refrigerating machine oil stored in the oil reservoir to the compression mechanism part 3 and the bearings.
  • Figs. 2 are enlarged views for illustrating main parts of the scroll compressor according to Embodiment 1 of the present invention, and are illustrations of a periphery of a through hole for injection opened in the base plate of the fixed scroll.
  • Figs. 3 are plan views for illustrating examples of the valve body of the scroll compressor according to Embodiment 1 of the present invention.
  • Figs. 2 are schematic vertical sectional views for illustrating a periphery of the through hole 12 opened in the base plate portion 21 of the fixed scroll 20.
  • Fig. 2(A) is an illustration of a state in which the valve body 23 has moved away from the injection port 130 (lower position in Figs. 2 ) in such a manner that the injection port 130 and the compression chamber 8 communicate with each other.
  • Fig. 2(B) is an illustration of a state in which the valve body 23 has moved toward the injection port 130 (upper position in Figs. 2 ) in such a manner that the flow passage between the injection port 130 and the compression chamber 8 is closed.
  • the through hole 12 of the base plate portion 21 of the fixed scroll 20 includes, for example, a large-diameter portion 12a and a small-diameter portion 12b.
  • the large-diameter portion 12a is a hole opened in a position close to the injection port 130. That is, the large-diameter portion 12a is a hole communicating with the injection port 130.
  • the small-diameter portion 12b is a hole having an inner diameter smaller than that of the large-diameter portion 12a, and is a through hole allowing the large-diameter portion 12a and the compression chamber 8 to communicate with each other.
  • the valve body 23 has an outer peripheral shape that is substantially the same as an inner peripheral shape of the large-diameter portion 12a, and is inserted into the large-diameter portion 12a.
  • the outer periphery of the valve body 23 is formed to be slightly smaller than the inner periphery of the large-diameter portion 12a in such a manner that the valve body 23 is configured to move upward and downward inside the large-diameter portion 12a. That is, the valve body 23 is configured to reciprocate in a direction of approaching the injection port 130 and in a direction of moving away from the injection port 130.
  • the valve body 23 has a flow passage 23a configured to allow the refrigerant having flowed into the through hole 12 from the injection port 130 to flow out to the compression chamber 8.
  • the flow passage 23a is, as illustrated in Fig. 3(A) , at least one groove 23b formed in a surface of the valve body 23 facing the large-diameter portion 12a.
  • the flow passage 23a is, as illustrated in Fig. 3(B) , at least one cutout 23c formed in the surface of the valve body 23 facing the large-diameter portion 12a.
  • the flow passage 23a is, as illustrated in Fig.
  • the flow passage 23a may be formed also in the lower surface of the valve body 23 (surface that is away from the injection port 130). It is not always required that the flow passage 23a be formed in the valve body 23.
  • a groove may be formed in an inner peripheral wall of the large-diameter portion 12a to serve as the flow passage 23a. That is, it is only required that the flow passage 23a be formed between the valve body 23 and the through hole 12.
  • the through hole 23d corresponds to a second through hole of the present invention.
  • the spring 24 is also inserted into the through hole 12 opened in the base plate portion 21 of the fixed scroll 20.
  • the spring 24 is, for example, a compression spring formed by winding a wire into a coil shape, and is provided between the valve body 23 and the small-diameter portion 12b. That is, the spring 24 has one end placed in contact with a bottom portion of the large-diameter portion 12a, and is configured to urge the valve body 23 toward the injection port 130 with the other end.
  • the spring 24 is not limited to the above-mentioned shape.
  • the spring 24 may be a plate spring.
  • the shape of the through hole 12 is also not limited to the shape described above.
  • the valve body 23 moves downward to a position at which the pressure of the refrigerant supplied to the injection port 130 is balanced with the pressure of the refrigerant in the compression chamber 8 and the urging force of the spring 24.
  • the refrigerant having been supplied to the injection port 130 flows into the large-diameter portion 12a of the through hole 12, passes through the flow passage 23a and the small-diameter portion 12b, and is injected into the compression chamber 8.
  • the valve body 23 and the spring 24 act as the check valve configured to prevent the reverse flow of the refrigerant from the compression chamber 8 to the injection port 130.
  • the valve body 23 and the spring 24 are provided in the through hole 12 opened in the base plate portion 21 of the fixed scroll 20. Consequently, in the scroll compressor 1 according to Embodiment 1, when the injection of the refrigerant into the compression chamber 8 is stopped, the reverse flow of the refrigerant in the compression chamber 8 to the injection port 130 can be prevented, thereby dead volume can be reduced. Consequently, the scroll compressor 1 according to Embodiment 1 is capable of preventing degradation in performance. Moreover, when the scroll compressor 1 according to Embodiment 1 is to be assembled, it is only required that the valve body 23 and the spring 24 be inserted into the through hole 12. Consequently, the scroll compressor 1 according to Embodiment 1 can easily be assembled.
  • the check valve structure is made of the valve body 23, which is configured to reciprocate in the through hole 12. Consequently, the thickness of the valve body 23 in the reciprocation direction can be increased.
  • high-pressure refrigerant such as carbon dioxide refrigerant having a pressure higher than that of refrigerant used in the related art is sometimes used for a refrigeration cycle apparatus to which the scroll compressor is mounted.
  • the lead valve as in Patent Literature 1 is employed as a check valve configured to prevent the reverse flow in the injection flow passage, the lead valve has a structure of opening and closing the flow passage by elastic deformation itself, and, because of its structure, the thickness of the lead valve cannot be increased.
  • the valve body 23 in Embodiment 1 can be increased in thickness of the valve body 23. Consequently, through setting of the thickness of the valve body 23 to such a thickness as to prevent breakage even when a high pressure of the high-pressure refrigerant such as the carbon dioxide refrigerant is applied to the valve body 23, reliability of the scroll compressor 1 can be improved.
  • Embodiment 1 the valve body 23 and the spring 24 are directly inserted into the through hole 12 opened in the base plate portion 21 of the fixed scroll 20.
  • the scroll compressor 1 can be assembled more easily.
  • Embodiment 2 features that are not particularly described are the same as those of Embodiment 1, and the same functions or configurations are described with use of the same reference signs.
  • Figs. 4 are perspective views for illustrating a valve body and a spring of a scroll compressor according to Embodiment 2 of the present invention and a case configured to accommodate the valve body and the spring.
  • Figs. 5 are enlarged views for illustrating main parts of the scroll compressor according to Embodiment 2 of the present invention, and are illustrations of a periphery of a through hole for injection opened in the base plate of the fixed scroll.
  • Fig. 4(A) is an illustration of a disassembled state of a case 25.
  • Fig. 4(B) is an illustration of an assembled state of the case 25.
  • Fig. 5(A) is an illustration of a state in which the valve body 23 has moved away from the injection port 130 (lower position in Figs. 5 ) in such a manner that the injection port 130 and the compression chamber 8 communicate with each other.
  • Fig. 5(B) is an illustration of a state in which the valve body 23 has moved toward the injection port 130 (upper position in Figs. 5 ) in such a manner that the flow passage between the injection port 130 and the compression chamber 8 is closed.
  • the case 25 in Embodiment 2 is inserted into the through hole 12 opened in the base plate portion 21 of the fixed scroll 20 as illustrated in Figs. 5 .
  • this case 25 is made of a combination of a case component 25a and a case component 25b.
  • the case component 25a includes an end plate 251 and a plurality of side wall parts 252.
  • the end plate 251 has a through hole 253.
  • the case 25 is inserted into the through hole 12 opened in the base plate portion 21 of the fixed scroll 20
  • the end plate 251 is brought into contact with the chamber 13.
  • the through hole 253 of the end plate 251 and the injection port 130 of the chamber 13 communicate with each other.
  • the through hole 253 of the end plate 251 serves as a flow passage configured to allow the refrigerant to flow into the case 25 from the injection port 130.
  • one ends (upper ends in Figs. 5 ) of the plurality of side wall parts 252 are connected to an outer peripheral portion of the end plate 251.
  • the case component 25b includes an end plate 254 and a plurality of side wall parts 255.
  • the end plate 254 is placed further away from the chamber 13 than is the end plate 251 of the case component 25a.
  • the plurality of side wall parts 255 are connected to an outer peripheral portion of the end plate 254.
  • the end plate 254 is connected to the side wall parts 255 at a position higher than one ends (lower ends in Figs. 5 ) of the side wall parts 255. That is, as illustrated in Figs.
  • the case 25 is assembled by interposing the side wall parts 255 of the case component 25b to the side wall parts 252 of the case component 25a. That is, the side wall of the case 25 is made of the side wall parts 252 and the side wall parts 255. At this time, a space is opened between the side wall parts 255. As indicated by the arrows in Fig. 4(B) , this space serves as a flow passage configured to allow the refrigerant having flowed into the case 25 from the injection port 130 to flow out to a space below the end plate 254.
  • the valve body 23 and the spring 24 are accommodated in the case 25 having the configuration described above.
  • the valve body 23 is configured to reciprocate in the case 25 in a direction of approaching the injection port 130 and in a direction of moving away from the injection port 130.
  • the valve body 23 moves in the direction of approaching the injection port 130 and comes into contact with the end plate 251 of the case 25, thereby closing the through hole 253.
  • the spring 24 is accommodated in the case 25 in such a manner that the spring 24 has one end placed in contact with the end plate 254 and urges the valve body 23 toward the injection port 130 with the other end.
  • the valve body 23 moves downward to a position at which the pressure of the refrigerant supplied to the injection port 130 is balanced with the pressure of the refrigerant in the compression chamber 8 and the urging force of the spring 24.
  • the refrigerant having been supplied to the injection port 130 flows into the case 25 from the through hole 253 of the end plate 251, flows out to the space below the end plate 254 through between the side wall parts 255, and is injected into the compression chamber 8 through the small-diameter portion 12b.
  • the scroll compressor 1 according to Embodiment 2 when the case 25 is assembled in advance under the state in which the valve body 23 and the spring 24 are accommodated in the case 25, the valve body 23 and the spring 24 can be assembled by only inserting the case 25 into the through hole 12 opened in the base plate portion 21 of the fixed scroll 20. Consequently, the scroll compressor 1 according to Embodiment 2 can be assembled more easily than in the case of Embodiment 1.
  • the configurations of the scroll compressor 1 described in Embodiment 1 and Embodiment 2 are merely examples.
  • the present invention can be implemented even when the configuration of the scroll compressor 1 is suitably changed within the range in which the above-mentioned functions are achieved.
  • usage other than the check valve for injection can be achieved.
  • the object to be compressed by the scroll compressor according to the present invention is not limited to the refrigerant. Even when the scroll compressor according to the present invention is used for compression of other gas such as air or nitrogen gas, the above-mentioned effects can be attained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP16907249.3A 2016-06-28 2016-06-28 Compresseur à spirale Withdrawn EP3477113A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/069137 WO2018003016A1 (fr) 2016-06-28 2016-06-28 Compresseur à spirale

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EP4325055A1 (fr) * 2022-08-16 2024-02-21 BITZER Kühlmaschinenbau GmbH Machine à spirales à injection et système frigorifique

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EP3477113A4 (fr) 2019-05-01
KR20180124130A (ko) 2018-11-20
JPWO2018003016A1 (ja) 2019-01-31
WO2018003016A1 (fr) 2018-01-04
JP6641479B2 (ja) 2020-02-05

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