JP2007327376A - Gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas compressor capable of preventing excessive compression from occurring in a suction/compression chamber without increasing contact noise by the opening/closing operation of a discharge valve mechanism formed in a discharge hole. <P>SOLUTION: This gas compressor 10 comprises a compressor body 12 having the suction/compression chamber 25 in which a compression stroke is performed. The compressor body 12 comprises a discharge passage 50 through which the compressive gas produced in the suction/discharge chamber 25 is discharged and the discharge valve mechanism 60. The discharge passage 50 comprises a main discharge passage part 51 and an auxiliary discharge passage 52. The discharge valve mechanism 60 comprises a main discharge valve element 63 for closing and opening the auxiliary discharge passage part 52 and an auxiliary discharge valve element 64 for closing and opening the auxiliary discharge passage part 52. The main discharge valve element 63 opens the main discharge passage part 51 for each compression stroke by pressure in the suction/compression chamber 25. The auxiliary discharge valve element 64 opens the auxiliary discharge passage part 52 by pressure in the suction/compression chamber 25 in each compression stroke when the pressure in the suction/compression chamber 25 is higher than a predetermined pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to, for example, a gas compressor used for compressing refrigerant gas in a vehicle air conditioner, and in particular, a compressor main body passes through a discharge passage and a discharge valve mechanism provided in the gas compressed by the compressor main body. The present invention relates to a gas compressor discharged from an air compressor.

The conventional gas compressor compresses and compresses the sucked gas by sucking the gas from the suction chamber through the suction passage, the suction chamber capable of taking in the gas from the outside, the discharge chamber capable of discharging the gas to the outside, and the suction chamber. Some include a compressor main body having a suction compression chamber in which a compression process is performed in which a gas is discharged toward the discharge chamber through the discharge passage. The discharge passage of the gas compressor is formed by a through hole provided in a wall portion that defines the compressor body and the discharge chamber. In this discharge passage, there is a gas compressor provided with a discharge valve mechanism for preventing the compressed gas in the discharge chamber from flowing back to the suction compression chamber through the discharge passage (see, for example, Patent Document 1). . The discharge valve mechanism has a discharge valve body made of a plate-shaped member that can be deformed and deformed so as to cover the opening of the wall of the discharge passage so as to cover the opening. When the compression chamber reaches a desired pressure, it is set to bend and deform to open the discharge passage. For this reason, the discharge valve mechanism causes the discharge valve body to bend and deform in response to fluctuations in the pressure of the suction compression chamber in which the compression stroke is performed, thereby intermittently connecting the discharge passage. It is possible to discharge the compressed gas having a desired pressure to the gas and to prevent the backflow of the gas from the discharge chamber to the suction compression chamber.
JP 2003-254275 A

  However, in the above-described gas compressor, for example, when the operation speed of the compressor body increases, that is, when the time per one compression stroke in the suction compression chamber is shortened, the time for discharging the compressed gas is shortened. However, since there is a limit on the flow rate that can be passed through the discharge passage, a predetermined amount of compressed gas may not be discharged from the suction compression chamber during the compression stroke. Then, in the suction compression chamber, since the gas is compressed by reducing the volume, overcompression occurs, that is, a compressed gas having a pressure higher than a desired pressure is generated. When overcompression occurs in the suction compression chamber, the power consumption increases in the gas compressor, and rectangular wave noise due to a sudden pressure change in the suction compression chamber occurs.

  For this reason, it is conceivable to form the discharge passage with a through-hole having a large diameter, but the discharge valve body of the discharge valve mechanism is set to a size that can cover the opening of the discharge passage to prevent backflow. Since it is necessary, the size of the discharge valve body is increased. Since the discharge valve body is configured to open and close the opening of the discharge passage by being bent and deformed according to the pressure of the suction compression chamber as described above, the compressor main body provided with the discharge passage when the opening and closing operation is performed. Since it contacts a wall part, if a size dimension is increased, the contact sound accompanying opening and closing operation will increase.

  Therefore, an object of the present invention is to provide a gas compressor that can prevent over-compression in the suction compression chamber without incurring an increase in contact sound associated with the opening / closing operation of the discharge valve mechanism provided in the discharge hole. It is to provide.

  In order to solve the above-described problem, the gas compressor according to claim 1 sucks in the gas through the suction passage leading to the suction chamber, compresses the sucked gas, and discharges the compressed gas through the discharge passage. A compressor body having a suction compression chamber for performing a compression stroke to be discharged toward the chamber, the compressor body having a discharge valve mechanism provided in the discharge passage to prevent backflow, the discharge passage being A main discharge passage portion and an auxiliary discharge passage portion that are formed from a through hole provided in a wall portion that defines the compressor main body and the discharge chamber, and the discharge valve mechanism includes: A main discharge valve body for intermittently connecting the main discharge passage portion; and an auxiliary discharge valve body for intermittently connecting the auxiliary discharge passage portion. The main discharge valve body has a first predetermined pressure in the suction compression chamber. The main discharge passage portion is opened, and the auxiliary discharge valve body is Characterized by opening the auxiliary discharge passage portion and a higher second predetermined pressure than entering the compression chamber wherein the first predetermined pressure.

  A gas compressor according to a second aspect of the present invention is the gas compressor according to the first aspect, wherein the main discharge passage portion is formed by a through-hole penetrating the wall portion of the compressor body. The main discharge valve body is provided with two corresponding to each through hole of the main discharge passage portion.

  The gas compressor according to claim 3 is the gas compressor according to claim 1 or 2, wherein the main discharge valve body is the wall portion of the main discharge passage portion from the outside of the compressor main body. The auxiliary discharge valve body is formed from a plate-shaped member that is deformable and deformable so as to be attached to the wall portion of the compressor body so as to cover the opening to the auxiliary discharge passage portion. Of the plate body attached to the wall portion of the compressor main body so as to cover the opening of the compressor body, and the auxiliary discharge valve body is higher in rigidity than the main discharge valve body. It is said that it is said.

  The gas compressor according to claim 4 is the gas compressor according to claim 3, wherein the auxiliary discharge valve body is opened from the attachment position of the compressor main body to the wall portion. The length dimension is set smaller than the length dimension from the attachment position of the main body of the compressor to the wall portion of the main discharge valve body to the opening of the main discharge passage portion. To do.

  The gas compressor according to claim 5 is the gas compressor according to claim 3, wherein the auxiliary discharge valve body is set to have a larger width dimension than the main discharge valve body.

  The gas compressor according to claim 6 is the gas compressor according to claim 1 or 2, wherein the main discharge valve body is the wall portion of the main discharge passage portion from the outside of the compressor body. The auxiliary discharge valve body is formed from a plate-shaped member that is deformable and deformable so as to be attached to the wall portion of the compressor body so as to cover the opening to the auxiliary discharge passage portion. Of the plate body attached to the wall portion of the compressor main body so as to cover the opening to the wall portion, and the auxiliary discharge passage portion is a through-hole that forms the main discharge passage portion. It is characterized by being formed by a through hole having an inner diameter smaller than the hole.

  The gas compressor according to claim 7 is the gas compressor according to any one of claims 2 to 6, wherein the compressor body includes a cylindrical cylinder body having an elliptical cross section and the cylinder body. A rotor is arranged in a cylinder chamber formed by a pair of side blocks that shield both open ends of the cylinder body, and the rotor divides the cylinder chamber into two opposing spaces, and a vane is generated as the rotor rotates. The vane is held by the rotor to slide on the wall surface of the suction compression chamber, and the cylinder chamber is partitioned in the circumferential direction by the vane, so that the volume increases and decreases in each of the two opposing spaces. A compression chamber is formed, and on the outside of the peripheral wall portion of the cylinder body, there are provided discharge chambers communicating with the discharge chamber at two locations corresponding to the opposing spaces. The discharge passages are provided at two locations on the peripheral wall portion of the cylinder body so as to communicate the antipodal spaces and the discharge chambers corresponding thereto, and the main discharge passage portions of the discharge passages, The through-holes that are paired in parallel at equal angular positions when viewed in the rotation direction of the rotor are configured by the through-holes, and in each of the discharge chambers, the discharge valve mechanism extends from the outside of the cylinder body to the main discharge passage portion. A main discharge valve body made of a plate-shaped member capable of bending deformation attached to the peripheral wall portion of the cylinder body so as to cover an opening to the wall portion, and the wall of the auxiliary discharge passage portion from the outside of the cylinder body And an auxiliary discharge valve body made of a deformable plate-like member attached to the peripheral wall portion of the cylinder body so as to cover the opening to the portion.

  The gas compressor according to claim 8 is the gas compressor according to any one of claims 3 to 7, wherein the main discharge valve body is not bent and deformed in the main discharge valve body. In the case where the auxiliary discharge valve body is attached to the wall portion of the compressor body so as to be spaced from the opening of the main discharge passage portion, and the auxiliary discharge valve body is not deformed flexibly. The auxiliary discharge passage portion is attached to the wall portion so as to come into contact with the wall portion of the compressor main body in the vicinity of the opening.

  According to the first and second aspects of the present invention, when the suction compression chamber is within the range from the first predetermined pressure to the second predetermined pressure, the main discharge passage portion and the main discharge valve body are When the compressed gas is discharged from the suction compression chamber through the route through which the suction compression chamber has reached the second predetermined pressure, the auxiliary discharge passage portion and the route through the main discharge passage portion and the main discharge valve body Compressed gas is discharged from the suction compression chamber via a route passing through the auxiliary discharge valve body. For this reason, it is possible to prevent the suction compression chamber from exceeding the second predetermined pressure, and thus it is possible to prevent over-compression from occurring in the suction compression chamber. Further, since the auxiliary discharge valve body prevents overcompression by opening the auxiliary discharge passage portion only when the pressure in the suction compression chamber becomes the second predetermined pressure, the opening and closing of the discharge valve mechanism An increase in contact sound accompanying the operation can be minimized.

  According to the third aspect of the present invention, the difference in timing at which the main discharge passage portion and the auxiliary discharge passage portion are opened is set by the difference in rigidity between the main discharge valve body and the auxiliary discharge valve body. Can be easily formed.

  According to the fourth aspect of the present invention, since the mutual rigidity is set by the difference in length between the main discharge valve body and the auxiliary discharge valve body, it can be easily formed.

  According to the fifth aspect of the present invention, since the mutual rigidity is set by the difference in width dimension between the main discharge valve body and the auxiliary discharge valve body, it can be easily formed.

  According to the sixth aspect of the present invention, the difference in timing at which the main discharge passage portion and the auxiliary discharge passage portion are opened is set by the difference in inner diameter between the main discharge passage portion and the auxiliary discharge passage portion. Therefore, it can be formed easily.

  According to the seventh aspect of the present invention, since the discharge passage and the discharge valve mechanism are provided corresponding to each facing space and each discharge chamber, it is possible to more appropriately prevent overcompression in the suction compression chamber. it can.

  According to the invention described in claim 8, since the main discharge valve body is attached to the wall portion of the compressor main body so as to be spaced from the main discharge passage portion when the deformation is not caused. The contact noise when the discharge valve body opens and closes the main discharge passage portion can be suppressed. Further, since the auxiliary discharge valve body is attached to the wall portion so as to come into contact with the wall portion of the compressor main body in the vicinity of the auxiliary discharge passage portion when there is no bending deformation, the suction compression chamber In a scene where the pressure is lower than a predetermined pressure, an operation similar to that of a conventional gas compressor in which the auxiliary discharge valve body and the auxiliary discharge passage portion are not provided can be obtained.

  According to the gas compressor of the present invention, during the normal operation, the compressed gas having the first predetermined pressure can be obtained, and the suction compression chamber is provided in the first compression chamber even under the operating condition where overcompression can occur. Exceeding the predetermined pressure of 2 can be prevented. For this reason, if the first predetermined pressure is set to a desired pressure as the compressed gas generated in the suction compression chamber and the second predetermined pressure is set to a pressure allowed for the suction compression chamber, During operation, compressed gas at a desired pressure can be obtained, and even under operating conditions where overcompression can occur, the suction compression chamber can be prevented from exceeding an allowable pressure, It is possible to prevent over compression from occurring in the compression chamber. Further, the auxiliary discharge valve element opens the auxiliary discharge passage portion only when the pressure in the suction compression chamber becomes the second predetermined pressure, that is, only under an operating condition in which overcompression can occur. Therefore, an increase in contact sound accompanying the opening / closing operation of the discharge valve mechanism can be minimized.

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

  FIG. 1 is a cross-sectional view of a gas compressor 10 used in a vehicle air conditioner.

  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 includes a condenser, an evaporator, and the like (not shown). 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 11b 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 to a rotation shaft 22 of a compression mechanism 12, which will be described later, via a clutch plate 15, and the driving force from the engine can rotate 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 an open end, and a front side block 17 and a rear side block 18 that close each open end of the cylinder body 16. It is configured. Thus, a cylinder chamber 19 (see FIG. 2) for compressing the refrigerant gas is formed.

  A cylinder-shaped rotor 20 is accommodated in the cylinder chamber 19, and the cylinder chamber 19 is partitioned into two opposing spaces 21 by the rotor 20. The rotor 20 has a rotating shaft 22. The rotating shaft 22 is rotatably supported by bearing portions 17a and 18a (see FIG. 1) 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.

  In the rotor 20, a plurality of vanes 23 are respectively held in the slit grooves 24 so as to be able to advance and retract. 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 thereof is the cylinder body 16. It contacts 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 refrigerant gas through a suction port 26 provided in the housing 11, a suction chamber 27, and a suction hole 17 c 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 50 to the corresponding discharge chambers 28. Each discharge passage 50 is provided with a discharge valve mechanism 60 as a check valve. Each discharge valve mechanism 60 has a discharge valve body 61 that can be bent and deformed to open and close the discharge passage 50, and a valve support 62 that regulates the amount of bending of the valve body.

  The rear side block 18 is formed with a discharge communication passage 30 extending from both discharge chambers 28 to the discharge chamber 29. 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.

  As shown in FIG. 1, a cyclone block 31 that separates lubricating oil from 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.

  Further, an oil supply path 33 for supplying the lubricating oil in the discharge chamber 29 between the members of the compressor body 12 is provided. 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 recesses 17b and 18b of the side blocks 17 and 18.

  In the gas compressor 10 according to the present invention, each discharge passage 50 and each discharge valve mechanism 60 are configured differently from the conventional one. The configuration of each discharge passage 50 and each discharge valve mechanism 60 will be described in detail below. In this embodiment, the discharge passages 50 and the discharge valve mechanisms 60 are provided in pairs corresponding to the two facing spaces 21. One discharge passage 50, the discharge valve mechanism 60, and the facing valve mechanism 60 are provided. Since the space 21, the other discharge passage 50, the discharge valve mechanism 60, and the counter space 21 are configured to be equal to each other, one will be described and the other description will be omitted.

  As shown in FIG. 2, each discharge passage 50 and each discharge valve mechanism 60 are provided in each discharge chamber 28, and each discharge chamber 28 is provided with a cutout portion provided in a pair with the cylinder body 16. 34 and the housing main body 11a. The cutout 34 is formed by cutting out the peripheral wall 16b of the cylinder body 16 from the outside. The notch 34 has a base surface 34a along the major axis direction of the cylinder chamber 19 and a rising surface 34b orthogonal to the base surface 34a.

  As shown in FIG. 3, the discharge passage 50 includes a main discharge passage portion 51 formed of a through hole that penetrates the peripheral wall portion 16 b of the cylinder body 16 in a direction orthogonal to the base surface 34 a and opens to the base surface 34 a, and an auxiliary discharge passage 50. And a discharge passage portion 52. In the present embodiment, the main discharge passage portion 51 is composed of two through-holes arranged in parallel at equal angular positions when viewed in the rotational direction of the rotor 20 (see FIG. 4). In the present embodiment, the auxiliary discharge passage portion 52 is configured by a single through hole provided at an angular position in front of the main discharge passage portion 51 as viewed in the rotational direction of the rotor 20 (FIGS. 2 and 2). 4). For this reason, each main discharge passage part 51 and auxiliary discharge passage part 52 will open base surface 34a by each opening 51a and opening 52a. In the present embodiment, the three through holes constituting each main discharge passage portion 51 and auxiliary discharge passage portion 52 have the same inner diameter. The discharge valve mechanism 60 includes a discharge valve body 61 and a valve support 62.

  The discharge valve body 61 is formed of a plate-like member that can be bent and deformed, and is attached to the base surface 34 a along the base surface 34 a of the notch 34. The discharge valve body 61 has two main discharge valve body portions 63, an auxiliary discharge valve body portion 64, and a connecting portion 65.

  As shown in FIG. 4, the two main discharge valve body parts 63 extend along the base surface 34 a so as to be spaced from each other when viewed in the axial direction of the rotor 20 (see FIGS. 2 and 3). The base portion is continuous with the connecting portion 65. When the discharge valve body 61 is attached to the base surface 34a, both the main discharge valve body parts 63 are set to have a length L1 in the vicinity of the tip so as to face the opening 51a of the main discharge passage 51, and the vicinity of the tip is the main discharge. The width dimension is set so as to cover the opening 51 a of the passage portion 51. Both main discharge valve body parts 63 can intermittently connect the main discharge passage part 51 by opening and closing the opening 51a.

  The auxiliary discharge valve body portion 64 extends between the main discharge valve body portions 63 along the base surface 34a, and is continued to the connecting portion 65 on the base end side. When the discharge valve body 61 is attached to the base surface 34a, the auxiliary discharge valve body 64 is set to a length L2 in which the vicinity of the tip faces the opening 52a of the auxiliary discharge passage 52, and the vicinity of the tip is the auxiliary discharge passage. The width dimension is set so as to cover the opening 52 a of the portion 52. The auxiliary discharge valve body portion 64 can intermittently connect the auxiliary discharge passage portion 52 by opening and closing the opening 52a. Further, the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64 have the same width dimension.

  The connecting portion 65 connects both the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64 that are arranged in parallel with a distance from each other when viewed in the axial direction of the rotor 20 (see FIGS. 2 and 3). In the present embodiment, as shown in FIG. 3, the connecting portion 65 has a recessed central portion 65a located in the center when viewed in the axial direction of the rotor 20 (projects toward the base surface 34a as compared to both end portions 65b). The auxiliary discharge valve body 64 that is continuous with the central portion 65a is recessed by this recess, and is set such that the auxiliary discharge valve body 64 protrudes toward the base surface 34a from both main discharge valve bodies 63. Each end portion 65 b of the connecting portion 65 is provided with an insertion hole 65 c. In this embodiment, the base surface 34a of the cutout portion 34 is protruded at a portion 34c to which each end portion 65b of the connecting portion 65 is attached so as to fit the discharge valve body 61, and the end portion 65b is inserted. It has a fastening hole 34d formed corresponding to the hole 65c.

  Thus, as shown in FIG. 4, the auxiliary discharge valve body portion 64 has a length dimension L <b> 2 set shorter than the length dimension L <b> 1 of both the main discharge valve body portions 63. The distance from the connecting portion 65 serving as the attachment position of the notch 34 to the base surface 34a to the opening 52a of the auxiliary discharge passage 52 is the distance from the opening 51a of each main discharge passage 51 in each main discharge valve body 63. It becomes shorter than the interval. Here, both the main discharge valve body parts 63 and the auxiliary discharge valve body parts 64 are constituted by through-holes having the same diameter and communicating with the suction compression chamber 25, so that the vicinity of the distal ends of the both main discharge valve body parts 63. An equal urging force is applied from the suction compression chamber 25 to the vicinity of the tip of the auxiliary discharge valve body 64. However, since the length dimension of the auxiliary discharge valve body portion 64 is set smaller than the length dimension of each main discharge valve body portion 63, the auxiliary discharge valve body with respect to an equal urging force from the suction compression chamber 25. The body part 64 has higher rigidity than each main discharge valve body part 63. In this way, by providing a difference in rigidity with respect to the same urging force from the suction compression chamber 25, the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64 are bent with respect to the pressure of the same suction compression chamber 25. There is a difference in the timing of deformation.

  Here, the main discharge valve body portions 63 are deformed so as to open the openings 51a of the main discharge passage portions 51 when the refrigerant gas compressed in the suction compression chambers 25 reaches a desired pressure. The length dimension L1 is set in consideration of the characteristics of the material and the like. This desired pressure is the first predetermined pressure.

  Further, the auxiliary discharge valve body 64 has an upper limit value of the pressure of the refrigerant gas compressed in each suction compression chamber 25 (for example, the pressure of the suction compression chamber 25 set in consideration of power consumption, rectangular wave noise, etc.). The length dimension L2 is set in consideration of the characteristics of the material and the like so that the bending deformation that opens the opening 52a of the auxiliary discharge passage 52 occurs when the upper limit is reached. This desired pressure is the second predetermined pressure.

  A valve support 62 is provided to protect the discharge valve body 61 (see FIGS. 2 and 3). As shown in FIG. 3, the valve support 62 has a plate shape that gently curves in the extending direction, and is formed of a material having high rigidity. The valve support 62 is disposed so as to cover the discharge passage 50 with the discharge valve body 61 interposed between the valve support 62 and the base surface 34 a, and the deformation amount of the discharge valve body 61 that is deformed as the discharge passage 50 is opened and closed. To regulate.

  In the present embodiment, the valve support 62 has three extending portions 62a, 62b, and 62c that are gently curved in the extending direction along both the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64. . The extension part 62c located between the extension parts 62a and 62b corresponds to the auxiliary discharge valve body part 64, and both extension parts match the discharge valve body 61 in which a recess is formed. The thickness is larger than 62a and 62c (see FIGS. 3, 5, and 6). The valve support 62 is formed with an insertion hole 62 d corresponding to the fastening hole 34 d of the base surface 34 a of the notch 34 and the insertion hole 65 c of the discharge valve body 61.

  In the discharge valve mechanism 60, a discharge valve body 61 is disposed on the base surface 34 a of the notch 34, a valve support 62 is disposed thereon, and the insertion hole 62 d of the valve support 62 and the insertion hole 65 c of the discharge valve body 61 are provided. The inserted fastening member 66 is screwed into the fastening hole 34d of the base surface 34a to be attached to the base surface 34a. In the discharge valve mechanism 60, as shown in FIG. 5, when both the main discharge valve body portions 63 are not deformed by deformation, the both main discharge valve body portions 63 are spaced from the openings 51 a of the respective main discharge passage portions 51. In other words, both the main discharge valve body parts 63 are attached to the base surface 34a at a distance from the surrounding base surface 34a defining each main discharge passage 51. Further, in the discharge valve mechanism 60, as shown in FIG. 6, when the auxiliary discharge valve body portion 64 is not bent and deformed, the auxiliary discharge valve body portion 64 is in contact with the opening 52a of the auxiliary discharge passage portion 52. That is, the auxiliary discharge valve body 64 is attached to the base surface 34a so as to come into contact with the surrounding base surface 34a that defines the auxiliary discharge passage 52.

  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 17c is compressed, and the compressed refrigerant gas is discharged to each discharge chamber 28 via each discharge passage 50 and each discharge valve mechanism 60. 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.

  Here, in the gas compressor 10 of the present invention, when the pressure of each suction compression chamber 25 becomes the first predetermined pressure during normal operation, the rigidity is lower than that of the auxiliary discharge valve body 64 due to the pressure. Only the both main discharge valve body parts 63 are bent and deformed, and only the both main discharge passage parts 51 are opened. Thus, during normal operation, the refrigerant gas compressed to the desired pressure (first predetermined pressure) in each suction compression chamber 25 is supplied to both the main discharge passage portions 51 of the discharge passage 50 and the discharge valve mechanism 60. It is discharged into the discharge chamber 28 through the main discharge valve body 63. For this reason, both main discharge passage portions 51 correspond to the discharge passages of the conventional gas compressor, and both main discharge valve body portions 63 correspond to the discharge valve bodies of the discharge valve mechanism of the conventional gas compressor. During the operation, refrigerant gas compressed to a desired pressure can be generated in the same manner as a conventional gas compressor.

  In the gas compressor 10, for example, when a vehicle engine (not shown) is driven at a high speed, the rotational speed of the rotary shaft 22 to which the driving force of the engine is transmitted via the clutch mechanism 13 is high. The driving speed increases. Then, since the time per one compression stroke in each suction compression chamber 25 is shortened, the compressed refrigerant gas passes from each suction compression chamber 25 through each discharge passage 50 and each discharge valve mechanism 60 to each discharge chamber 28. The dischargeable time is shortened. Then, since both main discharge passage portions 51 of the discharge passage 50 have a limit of a flow rate that can be passed, a predetermined amount of refrigerant gas is transferred from each suction compression chamber 25 to each discharge chamber 28 in one compression stroke. There is a possibility that it cannot be discharged. Here, the compressor main body 12 is configured to compress the refrigerant gas by reducing the volume of each suction compression chamber 25 as the rotor 20 rotates, so that a predetermined amount of refrigerant gas cannot be discharged. Then, the refrigerant gas is compressed to a pressure higher than the set desired pressure, and the pressure rises compared to the normal operation. In this case, in the gas compressor 10, when the pressure in the suction compression chamber 25 becomes higher than that during normal operation and becomes the second predetermined pressure, the pressure in the suction compression chamber 25 causes the two main discharge valve body portions 63 to The auxiliary discharge valve body 64 having a high rigidity is also bent and deformed to open the opening 52 a of the auxiliary discharge passage portion 52, and the refrigerant gas in the suction compression chamber 25 is added to both the main discharge passage portions 51 and auxiliary discharge. It is discharged to the discharge chamber 28 through the passage portion 52. Therefore, in the gas compressor 10 according to the present invention, the overcompression occurs in each suction compression chamber 25, that is, each suction compression chamber 25 compresses the refrigerant gas to a pressure higher than the second predetermined pressure. This can be prevented. For this reason, in the gas compressor 10, it is possible to prevent the generation of rectangular wave noise due to an increase in power consumption and a sudden change in pressure in the suction compression chamber 25.

  Further, in the gas compressor 10, in addition to the main discharge passage portion 51 corresponding to a conventional discharge passage, an auxiliary discharge passage portion 52 that is not opened during normal operation is provided, so that each suction compression is provided. This prevents overcompression in the chamber 25. Therefore, unlike increasing the inner diameter of the through hole that forms the discharge passage to prevent overcompression, it is not necessary to set the size of the discharge valve body provided in the discharge passage large, so the main discharge passage It is possible to prevent an increase in contact sound between the main discharge valve body portion 63 and the base surface 34a around the main discharge passage portion 51 that is generated when the portion 51 is opened and closed.

  Further, during the normal operation, the auxiliary discharge valve body 64 is in contact with the base surface 34a and seals the auxiliary discharge passage 52 (see FIG. 6). Since the refrigerant gas in the suction compression chamber 25 can be prevented from leaking to the discharge chamber 28, the refrigerant gas can be compressed to an appropriate pressure in the suction compression chamber 25.

  Since each main discharge valve body portion 63 is set to be spaced from the base surface 34a around the opening 51a of each main discharge passage portion 51 when there is no bending deformation (see FIG. 5). The contact noise when each main discharge valve body portion 63 opens and closes each main discharge passage portion 51 can be suppressed. This is because, when each main discharge valve body 63 attempts to contact the base surface 34a, it is necessary to bend and deform in a direction approaching the base surface 34a. This is because it occurs in the discharge valve body 63.

  When the refrigerant gas in the discharge chamber 29 tries to flow back to the respective suction compression chambers 25, the discharge valve mechanism 60 causes a pressure difference that evokes this reverse flow between the discharge chambers 28 and the discharge passages 50 leading to the respective suction compression chambers 25. Therefore, the pressure difference causes the deformation of the discharge valve body 61 to seal the discharge passage 50 and prevent the refrigerant gas in the discharge chamber 29 from flowing back to the suction compression chambers 25. be able to.

  Therefore, in the gas compressor 10 according to the present invention, it is possible to prevent over-compression from occurring in the suction compression chamber 25 without causing an increase in contact sound due to the opening / closing operation of the discharge valve mechanism 60 provided in the discharge passage 50. be able to.

  In the above-described embodiment, the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64 are provided with a difference in length between the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64. Although the rigidity is different, it is not limited to the above-described embodiment. For example, as shown in FIG. 7, the main discharge valve body portions 63 ′ and the auxiliary discharge valve body portions 64 are provided with a difference in the width dimension between the main discharge valve body portions 63 ′ and the auxiliary discharge valve body portions 64 ′. It may be configured to have a difference in rigidity from ', and although not shown in the drawings, the main discharge valve body portion 63' and the auxiliary discharge valve body portion 64 ' The structure which gives a difference in rigidity may be sufficient.

  Moreover, in the above-described embodiment, the main discharge passage portions 51 and the auxiliary discharge passage portions 52 are opened due to the difference in rigidity between the main discharge valve body portions 63 and the auxiliary discharge valve body portions 64. Although the timing is set, the present invention is not limited to the above-described embodiment. For example, as shown in FIG. 8, by appropriately setting the inner diameter of the through holes constituting each main discharge passage portion 51 ″ and auxiliary discharge passage portion 52 ′, each main discharge passage portion 51 ″ and auxiliary You may set the timing when discharge channel | path part 52 '' is open | released.

  Furthermore, in the above-described embodiment, the central portion 65a of the connecting portion 65 of the discharge valve body 61 and the auxiliary discharge valve body portion 64 are recessed and brought into contact with the base surface 34a of the notch 34 by the surface. Although the body portion 64 is configured to seal the auxiliary discharge passage portion 52, the wall surface around the auxiliary discharge passage portion is raised and the auxiliary discharge valve body portion is in contact with the wall surface. Well, it is not limited to the embodiments described above.

  In the embodiment described above, the discharge valve body 61 is configured by integrating the main discharge valve body portion 63 and the auxiliary discharge valve body portion 64 by the connecting portion 65. The discharge valve body may be provided individually corresponding to the passage portion 52, and is not limited to the above-described embodiment.

  In the above-described embodiment, each main discharge valve body 63 is set to be spaced from the base surface 34a of the notch 34 when there is no bending deformation, but may be set to abut. The present invention is not limited to the above-described embodiments.

  In the embodiment described above, the auxiliary discharge valve body portion 64 is set so as to contact the base surface 34a of the notch portion 34 and seal the auxiliary discharge passage portion 52 when bending deformation has not occurred. However, it may be set to be spaced, 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 refrigerant gas compressed by the compressor main body is discharged through the discharge passage and the discharge valve mechanism, for example, inside the cylindrical cylinder main body having an inner circular shape, The present invention may be applied to an eccentric rotor type compressor in which the rotor is disposed so as to have a rotation axis different from the axis, and is not limited to the above-described embodiment.

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 which decomposes | disassembles a discharge valve mechanism and shows with a discharge channel | path and its periphery. It is the front view which looked at the discharge valve body of the discharge valve mechanism from the upper direction (the direction orthogonal to the base surface of a notch part from the outer side of a cylinder main body). It is the fragmentary sectional view obtained along the II-II line | wire shown in FIG. It is the fragmentary sectional view obtained along the III-III line | wire shown in FIG. It is a front view similar to FIG. 4 which shows the other example of the discharge valve body of a discharge valve mechanism. FIG. 8 is a front view similar to FIGS. 4 and 7 showing another example of a discharge valve body and a discharge passage of the discharge valve mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas compressor 12 Compressor main body 16 Cylinder main body 16b Peripheral wall part 17 Front side block 18 Rear side block 19 Cylinder chamber 20 Rotor 21 Opposite space 23 Vane 25 Suction compression chamber 27 Suction chamber 29 Discharge chamber 50 Discharge passage 51 Main discharge passage portion 52 Auxiliary main discharge passage section 60 Discharge valve mechanism 63 Main discharge valve body section (as main discharge valve body) 64 Auxiliary discharge valve body section (as auxiliary discharge valve body)

Claims (8)

A compressor main body having a suction compression chamber for performing a compression stroke in which gas is sucked through a suction passage leading to the suction chamber, the sucked gas is compressed, and the compressed gas is discharged toward the discharge chamber through the discharge passage. ,
The compressor body has a discharge valve mechanism provided in the discharge passage to prevent backflow,
The discharge passage includes a main discharge passage portion and an auxiliary discharge passage portion that are independent from each other and are formed from through holes provided in a wall portion that defines the compressor body and the discharge chamber.
The discharge valve mechanism has a main discharge valve body for intermittently connecting the main discharge passage portion, and an auxiliary discharge valve body for intermittently connecting the auxiliary discharge passage portion,
The main discharge valve body opens the main discharge passage portion when the suction compression chamber reaches a first predetermined pressure, and the auxiliary discharge valve body has the suction compression chamber lower than the first predetermined pressure. A gas compressor characterized in that the auxiliary discharge passage is opened when a high second predetermined pressure is reached.   The main discharge passage portion is formed as a pair of through holes penetrating the wall portion of the compressor body, and the main discharge valve body corresponds to each through hole of the main discharge passage portion. The gas compressor according to claim 1, wherein two gas compressors are provided.   The main discharge valve body is a plate-shaped member capable of being deformed and deformed so as to be attached to the wall portion of the compressor main body so as to cover an opening from the outside of the compressor main body to the wall portion of the main discharge passage portion. The auxiliary discharge valve body is deformable and attached to the wall portion of the compressor main body so as to cover an opening from the outside of the compressor main body to the wall portion of the auxiliary discharge passage portion. The gas compressor according to claim 1, wherein the auxiliary discharge valve body is configured to be higher in rigidity than the main discharge valve body.   The auxiliary discharge valve body has a length dimension from an attachment position of the compressor body to the wall portion to the opening of the auxiliary discharge passage portion to the wall portion of the compressor body in the main discharge valve body. The gas compressor according to claim 3, wherein the gas compressor is set to be smaller than a length dimension from an attachment position to the opening of the main discharge passage portion.   The gas compressor according to claim 3, wherein the auxiliary discharge valve body is set to have a larger width dimension than the main discharge valve body.   The main discharge valve body is a plate-shaped member capable of being deformed and deformed so as to be attached to the wall portion of the compressor main body so as to cover an opening from the outside of the compressor main body to the wall portion of the main discharge passage portion. The auxiliary discharge valve body is deformable and attached to the wall portion of the compressor main body so as to cover an opening from the outside of the compressor main body to the wall portion of the auxiliary discharge passage portion. 3. The auxiliary discharge passage portion is formed by a through hole having an inner diameter smaller than that of the through hole forming the main discharge passage portion. The gas compressor described.   The compressor body has a rotor disposed in a cylinder chamber formed by a cylindrical cylinder body having an elliptical cross section and a pair of side blocks that shield both open ends of the cylinder body. The chamber is divided into two opposing spaces, and the vane is held by the rotor so that the vane slides on the wall surface of the suction compression chamber as the rotor rotates, and the cylinder chamber moves in the circumferential direction by the vane. The suction compression chamber whose volume is increased or decreased in each of the two opposing spaces by being partitioned is formed, and a discharge chamber communicating with the discharge chamber is disposed outside the peripheral wall portion of the cylinder body. The discharge passages are provided at two locations corresponding to the respective facing spaces, and the discharge passage communicates the respective facing spaces with the corresponding discharge chambers. Provided at two locations on the peripheral wall portion of the main body, and the main discharge passage portions of the discharge passages are constituted by the through holes that are paired in parallel at equal angular positions when viewed in the rotation direction of the rotor, The discharge valve mechanism is a flexibly deformable plate attached to the peripheral wall portion of the cylinder body so as to cover an opening from the outside of the cylinder body to the wall portion of the main discharge passage portion in each discharge chamber. A main discharge valve body made of a cylindrical member, and a deformable plate attached to the peripheral wall portion of the cylinder body so as to cover an opening from the outside of the cylinder body to the wall portion of the auxiliary discharge passage portion The gas compressor according to any one of claims 2 to 6, further comprising an auxiliary discharge valve body made of a member.   The main discharge valve body is attached to the wall portion of the compressor main body so as to be spaced from the opening of the main discharge passage portion when the main discharge valve body is not bent and deformed, When the auxiliary discharge valve body is not bent and deformed, the auxiliary discharge valve body is in contact with the wall portion of the compressor main body in the vicinity of the opening of the auxiliary discharge passage portion. The gas compressor according to any one of claims 3 to 7, wherein the gas compressor is attached.

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