JP2008240603A - Gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas compressor capable of preventing a suction compression space from becoming an over-compressed state. <P>SOLUTION: This gas compressor 10 is constituted by storing a compressor body 12 inside a housing 11, and has the compressor body 12 having a substantially columnar rotor 20 integrally rotating with a rotary shaft 22, a cylinder 16 surrounding its outside and a plate-like vane 23 embedded in the outer periphery of the rotor 20 and capable of varying a projection quantity from an outer peripheral surface of the rotor 20 so that the projecting side tip 23a follows a contour shape 16a of the cylinder, and defines the suction compression space 25 where the vane 23 repeats an increase-decrease in the volume in response to rotation of the rotary shaft 22 by cooperating with the cylinder 16 and the rotor 20. The vane 23 is provided with a communicating passage for communicating the suction compression space 25 on the front side when viewed in the rotational direction R with a space 25 on the rear side when viewed in the rotational direction, and a cutoff mechanism 50 capable of intermitting the communicating passage and conducting the communicating passage only when pressure of the front side suction compression space 25 exceeds the predetermined size. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas compressor in which a vane held so as to be able to advance and retreat from a rotor rotating in a cylinder chamber slides on an inner wall surface of the cylinder chamber and compresses gas in the cylinder chamber.

  In a conventional gas compressor, a compressor main body is housed in a housing, and the compressor main body includes a substantially cylindrical rotor that rotates integrally with a rotation shaft, and a cylinder that surrounds the outside of the rotor. Some have a plate-like vane that is embedded in the outer periphery of the rotor and whose protrusion amount from the outer peripheral surface of the rotor is variable so that the tip on the protruding side follows the contour shape of the cylinder. Here, the cylinder also includes a portion that functions as a side block that sandwiches the rotor from both end surfaces, but the side block may be a separate body from the cylinder.

And, if the rotor, cylinder, and vane, or if the side block is a separate structure from the cylinder, the rotor, cylinder, vane, and side block repeatedly increase and decrease the volume with the rotation of the rotating shaft, A suction compression chamber is defined that sucks gas, compresses the sucked gas, and discharges the compressed gas (see, for example, Patent Document 1).
JP 2002-250289 A

  However, in this gas compressor, there is a possibility that the pressure in the suction compression chamber becomes excessively high (hereinafter referred to as an overcompressed state). As a cause of this overcompression, for example, the lubricating oil introduced for lubrication and sealing in the compressor body enters the suction compression chamber more than a predetermined amount, so that the lubricating oil is compressed in the suction compression chamber. (Hereinafter referred to as liquid compression). If the suction compression chamber is overcompressed, the compressor main body, that is, the gas compressor, cannot perform its original function.

  This invention is made | formed in view of the said situation, and it aims at providing the gas compressor which can prevent that a suction compression chamber will be in an overcompression state.

  In order to solve the above-described problem, the gas compressor according to claim 1 is configured such that a compressor main body is housed in a housing, and the compressor main body rotates in an integrated manner with a rotating shaft. The amount of protrusion from the outer peripheral surface of the rotor is variable so that the columnar rotor, the cylinder surrounding the outer side of the rotor, and the protruding tip embedded in the outer periphery of the rotor follow the contour shape of the cylinder A gas compressor that defines a suction compression chamber that repeatedly increases and decreases in volume with the rotation of the rotary shaft in cooperation with the cylinder and the rotor. The vane has a communication path that communicates the suction compression chamber defined on the front side viewed in the rotation direction and a rear space viewed in the rotation direction, and the communication path can be intermittently connected. The pressure in the suction compression chamber exceeds the specified size Characterized in that the blocking mechanism for conducting the communication passage is provided only if.

  According to the configuration described above, when the pressure in the suction compression chamber exceeds a predetermined magnitude, the communication hole provided in the vane is in a conductive state due to the action of the shut-off mechanism, and the suction compression chamber is connected to the space behind the vane. Since it is communicated and the pressure of the suction compression chamber can be released to the rear side space, it is possible to prevent the suction compression chamber from being overcompressed.

  The gas compressor according to claim 2 is configured such that a compressor main body is accommodated in a housing, and the compressor main body includes a substantially cylindrical rotor that rotates integrally with a rotation shaft, and an outer side of the rotor. And a plate-like vane that is embedded in the outer periphery of the rotor and has a variable protrusion amount from the outer peripheral surface of the rotor so that the protruding tip follows the contour shape of the cylinder. A gas compressor that defines a suction compression chamber in front of and behind the vane as viewed in the rotational direction, wherein the vane repeatedly increases and decreases as the rotary shaft rotates in cooperation with the cylinder and the rotor. The vane has a communication passage communicating the suction compression chamber defined on the front side viewed in the rotation direction and the suction compression chamber defined on the rear side viewed in the rotation direction, and the communication passage is intermittently connected. Possible and pressure of the suction compression chamber on the front side Characterized in that the blocking mechanism for conducting the communication passage only when it exceeds a predetermined magnitude is provided.

  According to the configuration described above, when the pressure in the suction compression chamber exceeds a predetermined magnitude, the communication hole provided in the vane becomes conductive by the action of the shut-off mechanism, and the suction compression chamber is inhaled on the rear side of the vane. Since the pressure in the suction compression chamber is communicated with the compression chamber and the pressure in the suction compression chamber can be released to the suction compression chamber on the rear side, the suction compression chamber can be prevented from being overcompressed.

  The gas compressor according to claim 3 is the gas compressor according to claim 1 or 2, wherein the blocking mechanism is a space formed inward of the vane so as to cross the communication hole. A valve body slidably inserted between the blocking position for blocking the communication hole in the space and an open position for opening the communication hole, and the valve body to the blocking position side. The urging means is urged by the pressure of the suction compression chamber on the front side that exceeds a predetermined size through the communication path when the valve body located at the shut-off position is pressed. Then, the biasing force is allowed to allow the valve body to slide from the blocking position to the open position.

  According to the configuration described above, the valve body accommodated in the space provided in the inner side of the vane according to the force relationship between the urging force from the urging means and the pressing force due to the pressure of the suction compression chamber on the front side is provided. Since the communication hole is intermittently connected by sliding in the space, it is possible to prevent the suction compression chamber from being appropriately over-compressed with a simple configuration.

  The gas compressor according to claim 4 is the gas compressor according to any one of claims 1 to 3, wherein the communication hole is located in the vicinity of the tip of the vane on the front side. It is characterized by communicating with the compression chamber.

  According to the above configuration, since the communication hole communicates with the suction suction chamber on the front side in the vicinity of the tip of the vane, compression is performed in each suction compression chamber whose volume is increased or decreased according to the amount of protrusion of the vane from the rotor. An overcompressed state can be prevented over substantially the entire area to be performed.

  According to the gas compressor of the present invention, the suction compression chamber can be prevented from being overcompressed.

  The present invention will be described in detail with reference to the embodiment shown in FIGS.

  FIG. 1 is a sectional view of a vane rotary type gas compressor 10 used in an air conditioner for vehicles and the like.

  The gas compressor 10 is used, for example, for compressing a gaseous cooling medium, that is, a refrigerant gas in a vehicle air conditioner that performs cooling using the heat of vaporization of the refrigerant gas. And the cooling medium circulation path of the vehicle air conditioner. The gas compressor 10 compresses the refrigerant gas taken from the evaporator, and supplies the compressed refrigerant gas to the condenser.

  The gas compressor 10 includes a cylindrical housing 11, a compressor body 12, and a clutch mechanism 13. The housing 11 includes a housing main body 11a and a front housing 11b. The front housing 11b is attached to one end side of the housing body 11a and hermetically closes the housing body 11a. The compressor body 12 is accommodated in the housing 11 and compresses the refrigerant gas.

  The clutch mechanism 13 is attached to the front housing 11 b and transmits a driving force from a vehicle engine (not shown) to the compressor body 12. In the clutch mechanism 13, a pulley 14 around which a belt (not shown) is wound is connected via a clutch plate 15 to a rotating shaft 22 of a compressor body 12 described later, and the driving force from the engine can be rotated freely. It can be transmitted to the shaft 22.

  The compressor body 12 includes a cylinder body 16 (see FIG. 2) having an elliptical cross section and a cylindrical shape with both ends open, and a front side block 17 and a rear side block 18 that close each open end of the cylinder body 16. Has been. Thus, a cylinder chamber 19 (see FIG. 2) for compressing the refrigerant gas is formed.

  A cylindrical rotor 20 is accommodated in the cylinder chamber 19, and the cylinder chamber 19 is partitioned into two opposing spaces 21 (see FIG. 2) by the rotor 20. The rotor 20 has a rotating shaft 22. The rotating shaft 22 is rotatably supported by the bearing portions 17a and 18a of both side blocks 17 and 18. As described above, the driving force is transmitted from the clutch mechanism 13 to the rotating shaft 22. Thereby, the rotor 20 is rotated.

  As shown in FIG. 2, a plurality of vanes 23 are held on the rotor 20 so as to be able to advance and retreat, respectively, and the amount of protrusion from the outer peripheral surface of the rotor 20 is variable. Each vane 23 is provided to partition the cylinder chamber 19 into a plurality of suction compression chambers 25 along the rotation direction of the rotor 20. The front side block 17 and the rear side block 18 are respectively formed with a pair of recesses 17b and 18b (see FIG. 1) for storing oil. Lubricating oil is supplied to each slit groove 24 from both recesses 17b and 18b. For this reason, each vane 23 receives the pressure of the lubricating oil supplied to each slit groove 24 from both recesses 17b and 18b and the centrifugal force acting on each vane 23 by the rotation of the rotor 20, and the tip 23a has a cylinder body. 16 abuts against the inner peripheral wall surface 16a. Each suction compression chamber 25 increases or decreases in volume in accordance with the rotation of the rotor 20 in each of the two opposing spaces 21, functions as a suction space in a region where the volume increases, and functions as a compression space in a region where the volume decreases. To do.

  As shown in FIG. 1, each suction compression chamber 25 takes in the refrigerant gas through a suction port 26 provided in the housing 11, a suction chamber 27, and a suction hole 34 provided in the front side block 17. As shown in FIG. 2, each suction compression chamber 25 discharges the compressed refrigerant gas from the pair of discharge passages 35 to the corresponding discharge chambers 28. Each discharge passage 35 is provided with a discharge valve mechanism 36 as a check valve. Each discharge valve mechanism 36 includes a discharge valve body 36a that can be bent and deformed to open and close the discharge passage 35, and a valve support 36b that regulates the amount of bending of the valve body.

  As shown in FIG. 1, a discharge communication passage 30 extending from both discharge chambers 28 to the discharge chamber 29 is formed in the rear side block 18. The discharge chamber 29 is defined in the housing 11 by being partitioned by the other end of the housing body 11 a and the rear side block 18.

  A cyclone block 31 for separating the lubricating oil from the refrigerant gas is attached to the rear side block 18. The refrigerant gas in each discharge chamber 28 is guided to the inside of the cyclone block 31 through each discharge communication passage 30 that leads to the discharge chamber 28 and is discharged to the discharge chamber 29 through the inside. This refrigerant gas is stored in the discharge chamber 29 and supplied to a condenser (not shown) through a discharge port 32 provided in the housing 11.

  The cyclone block 31 separates the lubricating oil from the refrigerant gas passing inward, that is, from the refrigerant gas heading from the discharge chambers 28 to the discharge chambers 29 through the discharge communication passages 30 communicating therewith. The lubricating oil separated from the refrigerant gas by the cyclone block 31 is stored below the discharge chamber 29.

  An oil supply path 33 is provided for supplying the lubricating oil stored in the discharge chamber 29 between the members of the compressor body 12. The oil supply passage 33 includes oil supply passage portions 33a, 33b, and 33c formed in the cylinder body 16 and the side blocks 17 and 18. The oil supply path 33 c is open to the discharge chamber 29 at the lower edge of the rear side block 18. Lubricating oil in the discharge chamber 29 is supplied between the members of the compressor body 12 through the oil supply path 33 due to the pressure of the refrigerant gas in the discharge chamber 29. A part of this lubricating oil passes between the rotating shaft 22 of the rotor 20 and the bearing portions 17a and 18a that support the rotating shaft 22 and reaches both the recesses 17b and 18b of the side blocks 17 and 18.

  In the gas compressor 10 according to the present invention, each vane 23 is configured differently from the conventional one. The configuration of each vane 23 will be described in detail below. Since each vane 23 has the same configuration, only one of them will be described and the other description will be omitted.

  As shown in FIG. 3, the vane 23 has a plate shape as a whole, the tip 23 a is a curved surface that can smoothly slide on the inner peripheral wall surface 16 a of the cylinder body 16, and a blocking mechanism 50 is provided inward. Yes.

  The shut-off mechanism 50 is configured such that a valve body 52, a coil spring 53 as an urging means, and a plug member 54 are accommodated in an accommodation space 51 formed inward of the vane 23. In this embodiment, the accommodation space 51 has a rectangular parallelepiped shape that opens to the lower end 23 b of the vane 23 and extends to a position near the tip 23 a of the vane 23, and communicates with the front communication hole 55 and the rear communication hole 56. Yes.

  As shown in FIG. 4, the front side communication hole 55 has a front end surface 23 c that is located on the front side of the vane 23 at one end when viewed in the rotational direction R of the rotor 20. The vane 23 is perforated so as to open the front end portion of the space 51. The rear communication hole 56, as viewed in the rotation direction R, has one end opening the rear end surface 23 d located on the rear side of the vane 23 and the other end opening the rear side end of the accommodation space 51. Has been drilled.

  Therefore, when viewed in the rotation direction R, the suction compression chamber 25a defined on the front side of the vane 23 and the suction compression chamber 25b defined on the rear side of the vane 23 include the front communication hole 55, the accommodation space. 51 and the rear side communication hole 56 are communicated with each other. For this reason, the passage that passes through the front communication hole 55, the accommodation space 51, and the rear communication hole 56 serves as a communication hole that connects the front suction compression chamber 25 (25a) and the rear suction compression chamber 25 (25b). Function. A valve body 52, a coil spring 53, and a plug member 54 are accommodated in the accommodation space 51.

  As shown in FIGS. 3 to 5, the valve body 52 can be fitted into the accommodation space 51 so as to be slidable in the accommodation space 51 in the advance / retreat direction of the vane 23 (vertical direction when FIG. 3 is viewed from the front). It has a rectangular parallelepiped shape. The valve body 52 is in pressure contact with the end surface 51 a on the tip 23 a side of the vane 23 in the accommodation space 51, thereby filling the upper end portion of the accommodation space 51 and communicating with the front side communication hole 55 and the rear side communication via the accommodation space 51. The communication state with the hole 56 is blocked (the communication hole is blocked) (see FIG. 4). From this, the position where the valve body 52 is pressed against the end surface 51a of the accommodating space 51 is the blocking position C (see FIG. 4) of the valve body 52, and the end surface 51a functions as a valve seat.

  Further, the valve body 52 slides from the blocking position C toward the slit groove 24 side (the direction in which the amount of protrusion from the rotor 20 decreases), whereby the upper end portion of the accommodation space 51 is opened. Through the housing space 51, the front communication hole 55 and the rear communication hole 56 are in a communication state (the communication hole is conductive) (see FIG. 5). Therefore, the position where the valve body 52 does not exist between the front side communication hole 55 and the rear side communication hole 56 in the accommodating space 51 is the open position O of the valve body 52 (see FIG. 5), and the vane 23 is the valve box. Is functioning as

  The coil spring 53 is a biasing means that biases the valve body 52 toward the blocking position C (see FIG. 4), that is, biases the valve body 52 so as to press-contact the end surface 51 a of the accommodation space 51. When the pressure of the suction compression chamber 25a defined on the front side of the vane 23 becomes larger than a predetermined pressure, the coil spring 53 causes the valve body 52 located at the blocking position C to pass through the front communication hole 55 and the suction compression chamber 25a. The biasing force is set so as to allow the valve body 52 to slide from the blocking position C to the open position O when pressed by pressure. Here, the predetermined pressure in the suction compression chamber 25 (25a) is a pressure set in advance in the suction compression chamber 25, in other words, the compressor body 12 can perform its original function. The pressure of the size allowed in the suction compression chamber 25.

  The plug member 54 has a rectangular parallelepiped shape that fits into the accommodation space 51, has a size that can fill the lower end portion of the accommodation space 51 in a state where the valve body 52 is accommodated in the open position O and the contracted coil spring 53 is accommodated. Has been.

  The vane 23 first inserts the valve body 52 into the accommodating space 51, then inserts the coil springs 53 (four in the example shown in FIG. 3), and finally inserts the plug member 54. The lower end 54a of the plug member 54 is fixed so as to form the same plane as the lower end 23b of the vane 23 while sealing the lower end (open end) of the accommodation space 51. At this time, the coil spring 53 may be fixed to the valve body 52 or the plug member 54. Thereby, the blocking mechanism 50 is provided in the vane 23.

  In the gas compressor 10, as shown in FIG. 1, when the driving force is transmitted to the rotary shaft 22 via the clutch mechanism 13, the compressor body 12 causes the suction port 26, the suction chamber 27, and the The refrigerant gas taken into each suction compression chamber 25 via the suction hole 34 is compressed, and the compressed refrigerant gas is discharged to each discharge chamber 28 via each discharge passage 35 and each discharge valve mechanism 36. The refrigerant gas discharged to each discharge chamber 28 is discharged to the discharge chamber 29 through the discharge communication path 30 and the cyclone block 31, and discharged to the outside of the housing 11 through the discharge port 32. At this time, in the gas compressor 10, the lubricating oil is contained in the refrigerant gas discharged from each discharge chamber 28, but the lubricating oil is separated from the refrigerant gas when passing through the cyclone block 31. This lubricating oil is stored below the discharge chamber 29, and is supplied to the sliding portion inside the compressor main body 12 and each slit groove 24 through the oil supply path 33 by the pressure of the discharge chamber 29. In this series of operations, each vane 23 moves forward and backward from the slit groove 24 under the pressing force from the lubricating oil supplied to the slit groove 24 as described above. Since the accommodation space 51 is sealed by the plug member 54, the provision of the blocking mechanism 50 does not hinder receiving a pressing force from the lubricating oil.

  Here, generally in a gas compressor, there exists a possibility that the pressure of each suction compression chamber may become high too much (henceforth an overcompressed state). This is because, for example, the lubricating oil introduced into the compressor main body enters the suction compression chamber more than a predetermined amount, so that the lubricating oil is compressed in the suction compression chamber (hereinafter referred to as liquid compression). It is done. This is because the lubricating oil (liquid) has an extremely small volume fluctuation with respect to the pressure fluctuation as compared with the refrigerant gas (gas).

  In addition to this, for example, when the rotational speed of a rotating shaft to which the engine (not shown) of a vehicle is driven at high speed and the driving force of the engine is transmitted via the clutch mechanism becomes high, It is conceivable that the time per one compression stroke is shortened. This is because there is a limit to the flow rate that can be passed through the discharge passage from each suction compression chamber to the corresponding discharge chamber, so that a predetermined amount of refrigerant gas is discharged from each suction compression chamber in one compression stroke. This is because the volume of each suction compression chamber is reduced in spite of being unable to discharge into the chamber.

  On the other hand, in the gas compressor 10 of the present invention, since each vane 23 is provided with a communication hole (front communication hole 55, accommodation space 51 and rear communication hole 56) and a blocking mechanism 50, each suction compression is provided. It is possible to prevent the chamber 25 from being over-compressed as described above. This will be described below.

  As shown in FIG. 4, in each vane 23, when viewed from the vane 23, the suction compression chamber 25 a on the front side in the rotation direction R communicates with the front communication hole 55, and the suction compression chamber on the rear side in the rotation direction R. 25b and the rear side communication hole 56 are connecting. Here, when the pressure in the suction compression chamber 25a exceeds a predetermined magnitude, the valve body 52 slides from the blocking position C to the open position O as shown in FIG. A communication hole that reaches the rear communication hole 56 via the above is opened. This is because when the coil spring 53 of the shut-off mechanism 50 has a pressure in the suction compression chamber 25a defined on the front side of the vane 23 larger than a predetermined pressure, the valve body 52 located at the shut-off position C is moved to the front communication hole 55. This is because the urging force is set so as to allow the valve body 52 to slide from the shut-off position C to the open position O by being pressed by the pressure of the suction compression chamber 25a. For this reason, the refrigerant gas in the suction compression chamber 25a at a high pressure flows out to the suction compression chamber 25b on the rear side, which is at a relatively low pressure, through the open communication hole (see arrow A). Thus, the suction compression chamber 25a is prevented from being overcompressed.

  Here, when the pressure in the suction compression chamber 25a becomes smaller than a predetermined pressure due to the outflow through the communication hole, the valve body 52 urged by the coil spring 53 is slid to the cutoff position C and sucked into the suction compression chamber 25a. The communication state with the compression chamber 25b is released (the front communication hole 55 and the rear communication hole 56 are blocked). For this reason, in the suction compression chambers 25a, that is, when viewed in the series of operations of the gas compressor 10, in each suction compression chamber 25, the refrigerant gas can be discharged to the discharge chamber 28 with a desired pressure.

  Therefore, in the gas compressor 10 according to the present invention, the communication hole opened by the shut-off mechanism 50, that is, the front communication hole 55, the accommodation space 51, and the rear is only when the pressure of each suction compression chamber 25 exceeds a predetermined magnitude. Each of the suction compression chambers has a configuration in which high-pressure refrigerant gas is released to the suction compression chamber 25 (25b) on the rear side in the rotation direction R as viewed from the suction compression chamber 25 (25a) through the side communication hole 56. 25 can be prevented from being over-compressed.

  Further, in the gas compressor 10 according to the present invention, the suction compression chamber on the rear side in the rotation direction R as viewed from the suction compression chamber 25 (25a) only when the pressure of each suction compression chamber 25 exceeds a predetermined magnitude. 25 (25b), the refrigerant gas having a desired pressure can be discharged to the discharge chamber 28 by the compression in each suction compression chamber 25. Refrigerant gas with a certain pressure can be generated. In other words, during normal operation, refrigerant gas compressed to a desired pressure can be generated in the same manner as a conventional gas compressor. In this embodiment, the refrigerant gas compressed to a desired pressure is used. It can be fed to a condenser (not shown).

  Furthermore, in the gas compressor 10 according to the present invention, the communication holes are opened only when the pressure in each suction compression chamber 25 exceeds a predetermined magnitude, that is, the front communication holes 55 and the rear communication holes are communicated via the accommodation spaces 51. Since the holes 56 communicate with each other, in the normal state (when the pressure in the suction compression chamber 25 is equal to or lower than a predetermined level), the two suction compression chambers 25 adjacent to each other with the vanes 23 interposed therebetween (FIG. 4). 25a and 25b) are separated from each other by the valve body 52 at the shut-off position C, so that the refrigerant gas can be appropriately compressed in each suction compression chamber 25.

  In the gas compressor 10 according to the present invention, the lower end 23b of each vane 23 opened by the accommodation space 51 is sealed by the plug member 54 regardless of the operation of the shut-off mechanism 50, so that the rotor 20 (from the clutch mechanism 13) is sealed. Each vane 23 is appropriately advanced and retracted from the slit groove 24 so as to define each suction compression chamber 25 whose volume increases or decreases with the rotation of the rotary shaft 22) rotated by the power of the rotation, that is, the tip 23a of each vane 23 is appropriately moved. The cylinder body 16 can be slid on the inner peripheral wall surface 16a.

  In the gas compressor 10 according to the present invention, the communication for releasing the high-pressure refrigerant gas in the suction compression chamber 25 (25a) on the front side of each vane 23 to prevent each suction compression chamber 25 from being over-compressed. Since the hole communicates with the suction compression chamber 25 (25a) on the front side through the front communication hole 55 having one end opening the front end surface 23c of the vane 23 at a position near the tip 23a, the protrusion of the vane 23 from the rotor 20 It is possible to prevent an overcompressed state over substantially the entire region where compression is performed in each suction compression chamber 25 whose volume is increased or decreased according to the amount. This can prevent each suction compression chamber 25 from being over-compressed even in a scene where the amount of protrusion of the vane 23 from the rotor 20 is the smallest. The volume decreases as the projecting amount of the gas decreases, and the refrigerant gas is compressed by the decrease in the volume. Since the pressure increases as the projecting amount of the vane 23 decreases, it is more effective to enter the overcompressed state. It is desirable from the viewpoint of preventing.

  In the gas compressor 10 according to the present invention, inward of the vane 23 according to the force relationship between the urging force from the coil spring 53 as the urging means and the pressing force due to the pressure of the suction compression chamber 25 (25a) on the front side. The valve body 52 accommodated in the accommodation space 51 provided in the space intermittently connects the communication holes by sliding in the accommodation space 51 (communication of the front communication hole 55 and the rear communication hole 56 through the storage space 51). Therefore, each suction compression chamber 25 can be appropriately prevented from being over-compressed with a simple configuration.

  Therefore, in the gas compressor 10 according to the present invention, each suction compression chamber 25 can be prevented from being overcompressed. From this, it is possible to prevent the gas compressor 10 from being unable to perform its original function due to the suction compression chambers 25 being overcompressed.

  In the above-described embodiment, the communication between the two suction compression chambers 25 (see 25a and 25b in FIG. 4) adjacent to each other with the vanes 23 including the front communication hole 55, the accommodation space 51, and the rear communication hole 56 interposed therebetween. Although the hole is configured to be interrupted by the blocking mechanism 50, the communication path that connects the suction compression chamber defined on the front side viewed in the rotational direction as viewed from the vane and the rear space viewed in the rotational direction. Is only required to be conducted when the pressure in the suction / compression chamber on the front side exceeds a predetermined level by the blocking mechanism, and is not limited to the above-described embodiment.

  In the above-described embodiment, the shutoff mechanism 50 communicates with the valve body 52 provided in the accommodation space 51 according to the magnitude relationship between the urging force from the coil spring 53 and the pressing force due to the pressure in the suction compression chamber 25a on the front side. Although the hole is configured to be intermittent, it is sufficient that the communication hole is made conductive only when the pressure of the suction suction chamber on the front side exceeds a predetermined size, and is limited to the above-described embodiment. is not.

  Further, in the above-described embodiment, the coil spring 53 is used as means for biasing the valve body 52 in the shut-off mechanism 50. However, the coil spring 53 is communicated only when the pressure in the suction compression chamber on the front side exceeds a predetermined magnitude. What is necessary is just to energize the valve body 52 with the energizing force which permits the movement from the interruption | blocking position C of the valve body 52 to the open position O so that a hole may be conducted, and it is not limited to the above-mentioned Example.

  In the embodiment described above, one end of the front communication hole 55 communicating with the suction compression chamber 25 on the front side of the vane 23 in the communication hole opens the front end surface 23c positioned on the front side of the vane 23 at a position near the tip 23a. However, the communication hole is not limited to the above-described embodiment as long as it communicates the suction compression chamber on the front side of the vane and the space on the rear side.

  In the above-described embodiment, the cylinder of the compressor main body 12 is constituted by the cylindrical cylinder main body 16 and the front side block 17 and the rear side block 18 that close both open ends thereof. The front side block 17 and the rear side block 18 (including any one of them) may be integrally formed, and is not limited to the above-described embodiment.

  In the above-described embodiment, an example is shown in which the present invention is applied to a concentric rotor type compressor in which the rotor 20 is provided so as to have an axis of rotation on the axis of the cylindrical cylinder body 16 having an elliptical inner shape. If the compressor body is configured to slide the inner wall of the cylinder chamber and compress the gas in the cylinder chamber so that the vane can be moved back and forth from the rotor rotating in the cylinder chamber, for example, the inner side has a circular shape. The present invention may be applied to an eccentric rotor type compressor in which a rotor is arranged so as to have a rotational axis different from the axis of the cylinder main body, and is limited to the above-described embodiments. It is not a thing.

It is sectional drawing which shows typically the gas compressor which concerns on this invention. It is sectional drawing obtained along the II line | wire shown in FIG. It is a typical perspective view developed and shown in each component in order to explain a communicating hole and a blocking mechanism provided in a vane. FIG. 3 is a partially enlarged view showing the vicinity of the vane shown in FIG. 2 in order to explain the communication hole and the blocking mechanism provided in the vane, and shows a state where the vane is in the blocking position. It is the elements on larger scale similar to FIG. 4 for demonstrating operation | movement of a communicating hole and the interruption | blocking mechanism, and has shown the state which has a vane in an open position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas compressor 11 Housing 12 Compressor main body 16 Cylinder main body 16a (as a cylinder) 16a Inner wall surface (it is the outline shape of a cylinder) 20 Rotor 22 Rotating shaft 23 Vane 23a Tip 25 Suction compression chamber 27 Suction chamber 29 Discharge chamber 50 Blocking mechanism 51 (as space) receiving space 53 (as urging means) coil spring 55 (constitutes part of communication hole) front communication hole 56 (composes part of communication hole) rear communication hole

Claims (4)

A compressor main body is housed inside the housing, and the compressor main body is configured to have a substantially cylindrical rotor that rotates integrally with the rotary shaft, a cylinder that surrounds the rotor, and an outer periphery of the rotor. A plate-like vane that is embedded and has a variable protruding amount from the outer peripheral surface of the rotor so that the tip of the protruding side follows the contour shape of the cylinder, and the vane cooperates with the cylinder and the rotor. A gas compressor that defines a suction compression chamber that repeatedly increases and decreases with the rotation of the rotating shaft;
The vane has a communication path that communicates the suction compression chamber defined on the front side viewed in the rotation direction and a rear space viewed in the rotation direction, and the communication path can be intermittently connected. A gas compressor, comprising: a shut-off mechanism that conducts the communication passage only when the pressure in the suction compression chamber exceeds a predetermined magnitude. A compressor main body is housed inside the housing, and the compressor main body is configured to have a substantially cylindrical rotor that rotates integrally with the rotary shaft, a cylinder that surrounds the rotor, and an outer periphery of the rotor. A plate-like vane that is embedded and has a variable protruding amount from the outer peripheral surface of the rotor so that the tip of the protruding side follows the contour shape of the cylinder, and the vane cooperates with the cylinder and the rotor. A gas compressor that defines a suction compression chamber in front of and behind the vane as viewed in the rotation direction, which repeatedly increases and decreases in volume with the rotation of the rotary shaft;
The vane communicates with the suction compression chamber defined on the front side viewed in the rotational direction and the suction compression chamber defined on the rear side viewed in the rotational direction, and the communication path can be intermittently connected. And a shut-off mechanism for conducting the communication passage only when the pressure in the suction compression chamber on the front side exceeds a predetermined magnitude. The blocking mechanism slides between a space formed inside the vane so as to cross the communication hole, and a blocking position that blocks the communication hole and an open position that opens the communication hole in the space. A valve body that is movably fitted in the space, and a biasing means that biases the valve body toward the blocking position,
When the valve body located at the shut-off position is pressed by the pressure of the suction compression chamber on the front side exceeding a predetermined size via the communication path, the biasing means is moved from the shut-off position to the open position. The gas compressor according to claim 1, wherein the urging force allows the valve body to slide on the gas compressor. 4. The gas compressor according to claim 1, wherein the communication hole communicates with the suction compression chamber on the front side in the vicinity of the tip of the vane. 5.

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