JP2002048067A - Reed valve and gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas compressor having the excellent durability. SOLUTION: This gas compressor is provided with a cylinder block 7 provided with a compression chamber for compressing the gas and a discharge hole 7a for discharging the gas compressed in the compression chamber to the outside, a reed 22 arranged so as to cover the outside of the discharge hole 7a of the cylinder block 7 and to be separated from the cylinder block 7 by a pressure difference between the inside of the compression chamber of the cylinder block 7 and the outside of the cylinder block 7, and a valve support 23 fixed to the cylinder block 7 with the reed 22 and for abutting on the reed 11 with the cylinder block 7 from a back side thereof so as to regulate a rise of the reed 22. A surface of the reed 22 is coated with a thin layer 22a of polytetrafluoroetylene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor used for an air conditioner system and the like, and a reed valve used for the gas compressor and the like, and more particularly, to improvement of durability of a reed valve.

[0002]

2. Description of the Related Art Conventionally, gas compressors and other fluid machines used in air conditioner systems such as car coolers have been used to open and close an outlet hole of a passage member having a fluid passage and a discharge hole therein. , A reed valve is provided. The reed valve includes a reed, and the reed contacts the flow path member from the outside by a pressure difference between the outside and the inside of the flow path member, and opens and closes the outflow hole.

For example, in a vane rotary type gas compressor used as a gas compressor for a car cooler, a rotor is provided in a hollow portion of a cylindrical cylinder having an inner peripheral surface having an elliptical cross section in a radial direction. The vane is held in the slit of the rotor so as to be able to come and go. In this gas compressor, the vane is pressed against the inner peripheral surface of the cylinder by the centrifugal force and the oil pressure in the slit to form a compression chamber, and the volume of the compression chamber changes with the rotation of the rotor. Then, an external gas is introduced into the compression chamber from the suction port, compressed and discharged from the discharge hole. The gas compressor is provided with a reed valve having a reed covering the discharge hole and a valve support.

FIG. 6 is a view showing a conventional reed valve used in the above-described conventional gas compressor. As shown in FIG. 6, the reed valve 120 includes a reed 122 and a valve support 123. The lead 122 is disposed so as to extend outside the discharge hole 107a of the cylinder 107, and one end is fixed to the cylinder 107 with a bolt 128, and the other end is a free end. When the pressure of the gas in the compression chamber becomes equal to or higher than a predetermined value, the free end is lifted from the cylinder 107 by this pressure, and the discharge hole 107a is opened. One end of the valve support 123 is connected to the lead 12.
2 is fixed together with the one end of the lead 122 to the cylinder 107 from the outside, and regulates the lifting of the lead 122. The valve support 123 includes a flat plate-shaped straight portion 123a that extends linearly up to a bending starting point P0 ′ at a predetermined position in the length direction (rotation direction of the rotor);
From the bending starting point P0 ', a uniform curvature (a uniform radius of curvature R
0), a curved portion 123b formed in a curved shape so as to bend toward the cylinder 107 side. In such a conventional reed valve 120, if the amount of lifting of the lead 122 is too small, it becomes difficult to discharge the compressed gas, and if the amount of lifting is too large, the responsiveness of opening and closing is reduced, and the gas flows backward. I will. Therefore, the valve support 123 regulates the lift amount while securing a predetermined lead lift amount.

[0005]

As described above, in the prior art reed valve 120 and the fluid machine equipped with the reed valve, each time the compression chamber passes through the discharge hole, the reed 12 is moved.
2 reciprocates between the cylinder 107 and the valve support 123 to repeatedly open and close the discharge hole 107a, and the lead 122 frequently collides with the cylinder 107 and the valve support 123. Therefore, the lead 122 is connected to the cylinder 1
07 and the valve support 123, damage due to collision with foreign matter mixed in gas, and damage due to the foreign matter being sandwiched between the cylinder and the valve support. Such damage may cause damage to the lead 122 due to the spread of the damage starting from the damaged portion or stress concentration at the damaged portion.

[0006] The lead 122 is disposed around the discharge hole 107a so as to close the discharge hole 107a. Therefore, at the time of lifting, the free end further lifts than the lifting amount L1 required for securing the discharge amount from the discharge hole. FIG. 7 is a diagram illustrating a state in which the reed is lifted and the discharge hole is opened in the gas compressor of FIG. 6. As shown in FIG. 7, the curved portion 1 of the valve support 123
Since the curvature radius R of the curved portion 123b is constant,
Increases from the boundary with the straight portion 123 toward the other end (the end opposite to the one end fastened to the cylinder 107). The lift amount L2 'of the other end of the lead 122 is excessively large as compared with the lift amount L1 of the lead 122 above the discharge hole 107a. And for that,
Opening / closing responsiveness may be reduced, and careless backflow may occur, causing recompression, an increase in discharge temperature, and a reduction in compression performance. Furthermore, since the amplitude of the free end of the lead 122 increases, the load applied to the lead 122 due to collision with the surroundings or bending may increase, which may cause the durability of the lead 122 to decrease.

The present invention has been made in view of the above problems, and has as its first object to provide a durable reed valve and a gas compressor. Also,
A second object of the present invention is to provide a reed valve and a gas compressor having high responsivity for opening and closing a reed.

[0008]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention relates to a method in which a pressure difference between the outside and the inside of a flow path member having an outflow hole causes the flow path member to come into contact with and separate from the outside. hand,
A reed valve (first configuration) including a lead for opening and closing the outflow hole, wherein a surface of a portion of the lead facing the flow path member is covered with a thin layer of a fluororesin. Further, the present invention provides a lead that opens and closes the outflow hole by contacting and separating the flow member from the outside by a pressure difference between the outside and the inside of the flow path member having the outflow hole, A valve support fixedly disposed with respect to the flow path member so as to be able to come into contact with the member from the opposite side, and a portion of the lead facing the valve support, and a portion of the valve support facing the lead. At least one of the portion and the portion of the lead facing the flow path member provides a reed valve (second configuration) whose surface is covered with a thin layer of a fluororesin. Further, in order to achieve the second object, the present invention provides a fixed end portion fixed to a flow path member having an outflow hole for an internal fluid, and a fixed end portion opposite to the fixed end portion with respect to the outflow hole. A lead that opens and closes the outflow hole, wherein a free end side comes into contact with and separates from the flow path member due to a flow pressure difference between the outside and the inside of the flow path member. Contactable from the opposite side of the member,
A valve support fixedly disposed with respect to the flow path member, wherein the valve support has a radius of curvature on a side opposite to the free end of the lead than on a side opposite to the fixed end of the lead. Reed valve with large inflection (3rd
Configuration) is provided. In the reed valve of the third configuration, at least one of an opposing portion of the reed with the valve support, an opposing portion of the valve support with the reed, and an opposing portion of the reed with the flow path member is provided. Alternatively, a reed valve (fourth configuration) whose surface is covered with a thin layer of a fluororesin may be used. The first
In the reed valves having the above-described configurations, the second configuration, and the fourth configuration, the thin layer may have a thickness of 3 to 50 μm (fifth configuration).

Further, in order to achieve the first object, the present invention compresses gas with a reed valve having any one of the first, second and fourth configurations. A gas compressor (sixth configuration) including a compression chamber, and a cylinder as the flow path member having a discharge hole as the outflow hole for discharging gas compressed from the compression chamber to the outside. I do. In order to achieve the second object, the present invention provides a reed valve having any one of the third and fourth configurations, a compression chamber for compressing gas, and a compression chamber for compressing the gas. A gas compressor (seventh configuration) including: a cylinder as the flow path member having a discharge hole as the outflow hole for discharging the discharged gas to the outside.
In order to achieve the first object, the present invention provides a cylinder having a compression chamber for compressing a gas, a discharge hole for discharging the compressed gas from the compression chamber to the outside, and the discharge hole of the cylinder. A lead that is disposed so as to extend over the outside of the cylinder, and opens and closes the discharge hole by coming and going with the cylinder by a flow pressure difference between the outside and the inside of the cylinder. Provided is a gas compressor (eighth configuration) whose surface is covered with a thin layer of a fluororesin. The gas compressor of the eighth configuration may be a gas compressor (a ninth configuration) including the reed valves of the first to fourth configurations as a reed valve. Therefore, a compression chamber for compressing the gas, and a cylinder having a discharge hole for discharging the gas compressed from the compression chamber to the outside, and disposed outside the discharge hole of the cylinder, A reed valve having a lead that opens and closes the discharge hole by contacting and separating with the cylinder by a flow pressure difference between the outside and the inside of the cylinder, and an opposing portion of the reed with the flow path member; At least one of the surfaces facing the leads has a gas compressor (tenth configuration) whose surface is covered with a thin layer of a fluororesin, a compression chamber for compressing gas, and the compression chamber. A cylinder having a discharge hole for discharging the compressed gas from the chamber to the outside, and a cylinder disposed outside the discharge hole of the cylinder, wherein the cylinder has a flow pressure difference between the outside and the inside of the cylinder. A reed valve having a valve support that is fixedly disposed with respect to the flow path member so as to be capable of coming into contact with and separating the discharge hole and opening and closing the discharge hole, and to be able to abut the reed from the side opposite to the flow path member; At least one of a part of the lead facing the flow path member, a part of the flow path member facing the lead, a part of the lead facing the support valve, and a part of the support valve facing the lead. First, any of the gas compressors (eleventh configuration) whose surfaces are covered with a thin layer of a fluororesin achieves the first object. In the gas compressor according to any one of the eighth to eleventh configurations, the thin layer may have a thickness of 3 to 50 μm (twelfth configuration).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas compressor according to the present invention will be described below in detail with reference to the drawings. The gas compressor of the present embodiment is a gas compressor used for compressing a refrigerant gas in a car air conditioner system.
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a gas compressor according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of the compressor main body and its inside as viewed from a cross section taken along line AA of FIG. In addition, FIG.
FIG. 3 is a sectional view taken along line BB shown in FIG. 2.

As shown in FIG. 1, the gas compressor of the present embodiment includes a casing 1, a front head 2 for closing an open end of the casing 1, and a compressor body 3 housed in the casing 1. I have. The compressor main body 3 includes a cylinder formed by a cylinder block 7, a rear side block 6, and a front side block 5, and a rotor 9. The cylinder block 7 has a cylindrical shape having a hollow portion having an elliptical cross section. A front side block 5 is fixed to one of the two end surfaces of the cylinder block 7 on the front head 2 side, and the other is a rear side block. 6 is fixed. The hollow portion of the cylinder block 7 is closed by the front side block 5 and the rear side block 6 to form a cylinder chamber 8 having a substantially elliptical cylindrical inner circumference.

As shown in FIG. 2, a substantially cylindrical rotor 9 is accommodated in the cylinder chamber 8. Rotor 9
As shown in FIG. 2, each of the vanes has a vane groove 4 formed in the radial direction, and a vane 13 is held in each vane groove 4 so as to be able to protrude and retract. As shown in FIG. 1, the rotor shafts 9a and 9b extend from the rotor 9 in the axial direction thereof. Rotor shafts 9a and 9b are formed in shaft support holes 5 formed in front side block 5 and rear side block 6.
a and 6a rotatably supported respectively. An end portion of the rotor shaft 9a supported by the shaft bearing hole 5a of the front side block 5 is adapted to transmit a driving force from a motor (not shown) (engine of the vehicle), and the driving force is transmitted to the rotor shaft 9a. To the rotor 9 so that the rotor 9 is driven to rotate.

When the rotor 9 is driven to rotate by the prime mover, the vane 13 comes into contact with the peripheral wall of the cylinder chamber 8 due to the centrifugal force and the oil pressure in the vane groove 4.
Are partitioned by a vane 13 to form a compression chamber 14. Then, as the rotor 9 rotates,
The vanes 13 move in and out of the vane grooves 4 along the shape of the peripheral wall of the cylinder chamber 8, and the volume of each compression chamber 14 changes. This change in volume causes the refrigerant gas in the compression chamber 14 to be compressed. I have.

The front head 2 is formed with a suction port 16 for sucking a gas (refrigerant gas) to be compressed from the outside, and is provided between the front head 2 and the compressor body 3.
A suction chamber 15 into which gas from the suction port 16 is introduced is formed. The front side block 5 includes a suction chamber 15
And a cylinder chamber 8 are formed so that gas from the outside is sucked into the cylinder chamber 8 from the suction port 16 via the suction chamber 15 and the suction hole 5b in this order. . In addition, the intake hole 5b is provided in the cylinder block 7
Is connected to an intake chamber 6b provided in the rear side block 6, and the intake chamber 6b
It can be connected to the cylinder chamber 8. Therefore, the gas that has reached the intake hole 5b from the outside is directly sucked into the cylinder chamber 8, and is also sucked into the cylinder chamber 8 through the suction path 7b and the intake chamber 6b in this order.

As shown in FIG. 2, the cylinder block 7 has a valve mounting portion 7c formed in a notch shape from the outer peripheral side in the vicinity of each of both short-diameter ends as viewed in a radial cross section of the cylinder chamber 8. And each valve mounting part 7c
Is provided with a discharge hole 7a. The discharge hole 7a penetrates the cylinder block 7. The vicinity of each of both ends of the short diameter of the cylinder chamber 8 is the end position of the compression stroke of the gas inside the cylinder chamber 8, and when the volume of each compression chamber 14 is minimized, Is discharged from the discharge hole 7a. Each valve mounting portion 7c is provided with a reed valve 21 as one embodiment of the reed valve of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing the vicinity of the discharge hole of the cylinder block 7. As shown in FIG. As shown in FIG.
The reed valve 21 includes a thin plate-shaped lead 22 for opening and closing the discharge hole 7a, and a valve support 23 disposed on the opposite side of the reed 22 from the cylinder block 7.
The lead 22 is in the form of a thin plate having a thickness of about one tenth to several tenths of a millimeter, and has flexibility. As shown in FIG. 3, the lead 22 is formed by coating a thin sheet of carbon steel similar to a conventional one with a thin layer 22a of polytetrafluoroethylene as a fluorine-based resin. Therefore, the lead 22 has a portion facing the cylinder block 7 and a portion facing the valve support 23 covered with a thin layer of polytetrafluoroethylene. The thickness t of the thin layer 22a of a fluororesin such as polytetrafluoroethylene is 3 to 5
It is preferably 0 μm. If the thickness is less than 3 μm, carbon steel may be damaged by collision of foreign matter mixed in the compressed gas (refrigerant gas), and there is a possibility that a sufficient protective film effect by polytetrafluoroethylene cannot be obtained. Also, 5
If the thickness is larger than 0 μm, an unnecessarily large polytetrafluoroethylene layer will be formed, and the tensile force will increase due to the increase in the weight of the resin layer itself. This is because the flexibility of the cylinder 22 may decrease, and it may be difficult to obtain a sufficient lifting amount from the cylinder block 7 when the discharge hole 7a is opened.

A thin layer 22a of polytetrafluoroethylene
Can be formed by degreasing the surface of a thin plate of carbon steel, performing blasting or etching with an acid, applying a polytetrafluoroethylene-containing coated plastic, drying, firing, and cooling. The fluororesin such as polytetrafluoroethylene can easily form an extremely thin (3 to 50 μm) thin layer on the surface of carbon steel by the above-described simple process, and can also include a lubricating oil component contained in the compressed gas. And is suitable for coating the surface of the lead 22 of the gas compressor.

One end of the lead 22 is a fixed end fixed to the cylinder block 7, and the other end is disposed on the side opposite to the fixed end with respect to the discharge hole 7a. Has become. In this embodiment, the fixed end is fastened to the valve mounting portion 7c by a bolt 28 on the upstream side of the discharge hole 7a in the rotation direction of the rotor 9.
The free end is located downstream of the discharge hole 7a. The reed 22 has a free end that comes into contact with and separates from the valve mounting portion 7c due to a pressure difference between the compression chamber 14 and the outside of the cylinder block 7 to open and close the discharge hole 7a.

The valve support 23 is fixedly arranged on the cylinder block 7. In this embodiment, one end of the valve support 23 together with the lead 22 is attached to the valve mounting portion 7c of the cylinder block 7 by the bolt 2.
8 and fixed to the cylinder block 7. A flat portion 23a in the form of a flat plate extends from the fastened position to the other end (the side facing the free end of the lead) from the fastened position to a predetermined distance. As P0, a curved portion 23b that protrudes toward the cylinder block 7 up to the other end (the end opposite to the one end fixed to the cylinder block 7).
It has become. In the straight portion 23a, the distance between the cylinder block 7 and the valve support 23 gradually increases gradually toward the other end of the valve support 23,
In the curved portion 23b, the distance is sharply increased toward the other end. Also, the valve support 23
Is set so that the distance from the ejection hole 7a can secure a predetermined lifting amount L1 of the lead 22. Therefore, when the lead 22 is lifted from the cylinder block 7 and opens the discharge hole 7a, the lead 22 comes into contact with the valve support 23, and the lift amount of the lead 22 reduces the amount of compressed gas sufficiently discharged to the compression chamber and the like. Is secured to the extent that backflow does not occur.

The bending portion 23b of the valve support 23 includes an inflection portion P1 between the bending starting point P0 and the other end. The curved portion 23b has a thin plate shape curved in an arc shape with a radius of curvature R0 from the bending starting point P0 to the inflection portion P1, and has a radius of curvature R1 (R1>) from the inflection portion P1 to the other end. R0) is a thin plate curved in an arc shape. Therefore, the bending portion 23b is configured such that the other end side (the side facing the free end of the lead 22 and the downstream side in the rotation direction of the rotor 9) of the inflection portion P1 is closer to the one end side of the inflection portion P1 (lead 22 has a smaller curvature than the fixed end (opposed to the fixed end), and the curvature is gentle. Further, a portion having a curvature radius R0 from the bending starting point P0 to the inflection portion P1 is curved at the bending starting point P0 into an arc shape having a tangent line in the same direction as the straight portion 23a. From the inflection portion P1 to the other end, the inflection portion P1 is curved in an arc shape having a common tangent line from the bending starting point P0 to the inflection portion P1. In the present embodiment, the straight portion 23a
And the bending portion 23b, and the bending starting point P0 to the inflection portion P1 and the inflection portion P1 to the other end portion are formed so as to have a common tangent line at each boundary portion,
The valve support 23 has a shape that does not include a ridge at a portion facing the lead 22. This suppresses an impact due to a change in curvature when the lead 22 contacts the valve support 23.

As shown in FIG. 1, the rear side block 6 has a discharge communication passage 6c for the gas discharged from the discharge hole 7a.
Is formed, and an oil separator 17 is provided between the oil separator 17 and the casing 1.
Has been fixed. Then, the gas from the discharge hole 7a reaches the discharge chamber 18 between the rear side block 6 and the casing 1 through the discharge communication path 6c, and is separated from the oil by the oil separator 17. The gas separated from the oil is discharged to the outside via an exhaust port 19 formed in the casing 1. On the other hand, the oil separated by the oil separator 17 is stored in an oil storage chamber 20 formed between the rear side block 6 and the casing 1. In this oil storage room 20,
The pressure of the gas discharged into the discharge chamber 18 acts.

The rear side block 6 includes an oil storage chamber 20.
And a bearing (shaft bearing hole 6a) is formed with an oil passage 6d.
d to the shaft bearing hole 6a. The oil passage 6d is branched in the rear side block 6, and the lubricating oil further flows from the branch passage 6e into an oil supply passage 7e of the cylinder block 7 and an oil supply passage 5e formed in the front side block 5. , And is supplied to the bearing (shaft bearing hole 5a) of the front side block 5. As shown in FIG. 2, the front side block 5 and the rear side block 6 are provided with salary grooves 25, 25 which are continuous with the shaft bearing holes 5a, 6a and extend around the rotor shafts 9a, 9b, respectively. These sali grooves 25, 25 are formed at positions that can be continuous with the bottom of the vane groove 4 of the rotor 9 (vane back pressure chamber 4a). As a result, due to the pressure of the gas discharged into the discharge chamber 18, the lubricating oil in the oil storage chamber 20 is supplied to the sali grooves 25, 25, and is supplied from the sali grooves 25, 25 to the vane back pressure chamber 4a. The vane 13 is pressed against the peripheral wall of the cylinder chamber 8 by hydraulic pressure.

Further, as shown in FIG. 1, the rear side block 6 has a high-pressure supply passage 6f formed by branching an oil passage 6d upstream of the shaft support hole 6a. The high-pressure supply passage 6f is opened at the center of the rear side block 6 on the cylinder chamber 8 side, so that the lubricating oil from the oil storage chamber 20 is supplied without passing through the bearings 5a and 6a. Further, the front side block 5 includes a high-pressure supply path 5f formed by branching an oil supply path 5e on the upstream side of the shaft bearing hole 5a. The high-pressure supply passage 5f is opened at the center of the front side block 5 on the side of the cylinder chamber 8, so that the lubricating oil from the oil storage chamber 20 is supplied without passing through the shaft bearing holes 5a, 6a. The high-pressure supply paths 5f and 6f of the front side block 5 and the rear side block 6
5 and is opened in the vicinity of the discharge hole 7a of the cylinder block 7 so as to supply lubricating oil to the vane back pressure chamber 4a located in the vicinity of the discharge hole 7a at a pressure higher than that of the salary groove 25. ing. Thus, near the discharge hole 7a, the vane 13 is pressed against the peripheral wall of the cylinder chamber 8 with a stronger force than the upstream side when viewed from the rotation direction of the rotor 9.

In the gas compressor of the present embodiment having the above-described configuration, when the rotor 9 is driven to rotate by a motor (not shown), external gas flows from the suction port 16 to the suction chamber 1.
It is sucked into the compression chamber 14 via 5 and the like. Rotor 9
During the rotation of, the vane 13 comes and goes along the shape of the cylinder chamber 8. Therefore, the compression chamber 14 is reduced in size from the suction port 23 side to the discharge port side, and the gas in the compression chamber 14 is compressed as the rotor 9 rotates. When the compression chamber 14 is arranged in the region on the end side of the compression stroke where the volume is the minimum,
In this position, the compression chamber 14 communicates with the discharge hole 7a. Then, the compressed gas in the compression chamber 14 pushes up the lead 22 and blows out of the cylinder block 7 from the discharge hole 7a.

FIG. 4 is a view showing a state in which the lead 22 is lifted up and comes into contact with the valve support 23. At the time of gas ejection, the lead 22 is lifted from the cylinder block 7. Then, as shown in FIG. 4, it comes into contact with the valve support 23 and bends along the shape of the valve support 23. Therefore, the lift amount of the lead 22 on the discharge hole 7a is limited to L1. The other end of the lead 22 is
Lifting is performed up to a lifting amount L2 larger than the lifting amount L1 on the discharge hole 7a.

In this embodiment, the curved portion 23b of the valve support 23 includes an inflection portion P1 between the bending starting point P0 and the other end, and a radius of curvature R1 from the inflection portion P1 to the other end. Is getting bigger. Therefore, the inflection part P1
From the cylinder block 7 to the other end, and the amount of lifting from the cylinder block 7 increases gradually. Therefore, the lift amount L2 of the other end of the lead 22 in the present embodiment is smaller than that of the lead in the related art having the valve support formed in a curved shape with a uniform radius of curvature R0 from the bending starting point P0 without the inflection portion. It becomes smaller than the lift amount of the other end (L2 ′ in FIG. 7). Thus, in the present embodiment, the lead 22 on the ejection hole 7a
Is maintained at a predetermined value (L1), while the lifting amount L2 at the other end is suppressed to a small value. When the compressed gas is discharged from the compression chamber 14 and the pressure in the compression chamber 14 decreases, the lead 22 returns to the position above the cylinder block 7.

While the rotor 9 is rotating, the reed 22 reciprocates between the cylinder block 7 and the valve support 23 each time each compression chamber 14 passes inside the discharge hole 7a. The surfaces of the cylinder opposing portion opposing the valve support and the valve support opposing portion opposing the valve support collide with the valve mounting portion 7c of the cylinder block 7 and the cylinder-side surface of the valve support. And since the lead 22 is provided with the thin layer 22a of polytetrafluoroethylene on the surface of the cylinder block opposing part and the valve support opposing part, the carbon steel portion inside the lead 22 is protected by the thin layer 22a, There is no collision with the block 7, the valve support 23 and foreign substances in the gas.

As described above, according to the present embodiment, the surface of the lead 22 facing the cylinder block and the valve support is protected by the thin layer 22a of polytetrafluoroethylene, so that the carbon steel portion is damaged. Hard to do,
It is possible to avoid a decrease in the durability of the reed valve and the gas compressor, such as breakage of the reed 22 due to damage. Since the polytetrafluoroethylene layer is softer than the metal material, the polytetrafluoroethylene layer functions as a cushioning material that reduces the impact force when the lead 22 collides with the cylinder block 7 and the valve support 23. As a result, the impact transmitted to the carbon steel of the lead 22 is reduced. Reduce the load. In addition, the polytetrafluoroethylene layer has a longer life because it has better heat resistance and chemical resistance than other plastic materials and rubber materials. Further, according to the present embodiment, the curved portion 23b of the valve support 23 includes the inflection portion P1 between the bending starting point P0 and the other end, and the radius of curvature from the inflection point P1 to the other end. Since R1 is large and the curvature is gentle, the amount of lifting of the other end (free end) can be reduced while securing the amount of lifting L1 of the lead 22 above the ejection hole 7a. . And lead 2
2 is suppressed at a small amount at the free end, so that the amplitude of the lead 22 is suppressed to a small value.
Is reduced, and the durability of the lead 22 is improved.

Further, since the amount of lifting at the free end of the lead 22 is suppressed to a small value, the open / close response is improved, the backflow can be further avoided, and the compression performance can be improved. According to the present embodiment, since the amount of lifting of the free end of the lead 22 is reduced, the time required for the lead 22 to reciprocate between the valve support 23 and the cylinder block 7 is short. And between the lead 22 and the cylinder block 7, there is little possibility that foreign matter is caught between the lead 22 and the cylinder block 7, and the durability of the lead 22 is also improved from this point.

Further, in this embodiment, the valve support 2
3 has a gentle curvature on the side facing the free end of the lead 22, and the increase in the separation distance from the cylinder block 7 is kept small. Therefore, the number of times the lead 22 collides with the valve support 23 increases. The load on the lead 22 may increase due to an increase in the number of collisions, and the durability may be reduced. However, according to the present embodiment, since the surface of the lead 22 is formed of the coating layer made of polytetrafluoroethylene, and the lead 22 is protected, it is possible to avoid a decrease in the durability of the lead 22 due to an increase in the number of collisions. it can.

The present invention is not limited to the above embodiment, and the shape, size, material and the like of each member can be appropriately changed without departing from the gist of the present invention. For example, in the above-described embodiment, the lead 22
Is covered with a thin layer of a fluororesin, but is not limited to this. The lead 22 of the cylinder block 7 serving as a flow path member may be covered without covering the lead 22 or while covering the lead 22. And the surface of the valve support 23 facing the lead 22 may be covered with a thin layer of a fluororesin. In the above-described embodiments and modifications, polytetrafluoroethylene is used as the fluororesin, but is not limited thereto.Low molecular weight tetrafluoroethylene resin, tetrafluoroethylene to hexafluoropropylene Copolymer resins, vinylidene fluoride resins, chlorotrifluoroethylene resins, and the like can also be used.

In the above-described embodiment and each modified example,
The curved portion 23b of the valve support 23 has one inflection portion, but may have a plurality of inflection portions. In this case, for each inflection portion, the radius of curvature is large (the curvature is small) on the side facing the free end, on the side facing the fixed end and on the side facing the free end. The radius of curvature from the inflection portion on the other end side to the other end side may be a curvature radius = ∞, that is, a flat plate shape that is not curved. In such an example,
The curved portion 23b has only one inflection portion (P1), and P1
FIG. 5 shows an example in which the other end is not curved.

In the above-described embodiment, the gas compressor has a constant compression ratio for reducing a constant volume of gas to a constant volume, but a variable displacement gas compressor capable of changing the compression ratio. It can also be. Although the above embodiment is a gas compressor for compressing a refrigerant gas used in a car air-conditioning system, the present invention is also applicable to a gas compressor for compressing other gases. Further, the reed valve including the above-described reed and the reed valve including the above-described reed and the support valve can be used as a reed valve of a fluid machine other than the gas compressor.

[0034]

As described above, according to the reed valve and the gas compressor of the present invention, at least one of the reed and the member colliding with the reed is coated with the fluorine resin at the contact portion with the other. This reduces the damage caused by the lead colliding with other members when opening and closing the outflow hole, the damage caused by colliding with foreign matter in the gas, and the destruction and breakage caused by the damage. , And good durability can be obtained. Also,
ADVANTAGE OF THE INVENTION According to the reed valve and gas compressor of this invention, lifting of a reed valve can be suppressed to the required minimum and favorable open / close response can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic configuration of a gas compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the gas compressor of FIG. 1 as viewed from a cross section taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part showing a vicinity of a discharge hole of a cylinder block of the gas compressor of FIG.

FIG. 4 is a view showing a state in which a reed is lifted up and comes into contact with a valve support in the gas compressor of FIG. 1;

FIG. 5 is an enlarged cross-sectional view of a main part of a gas compressor according to another embodiment of the present invention, showing the vicinity of a discharge hole in a discharge hole open state.

FIG. 6 is an enlarged sectional view of a main part showing the vicinity of a discharge hole of a cylinder block of a conventional gas compressor.

FIG. 7 is a view showing a state in which the reed is lifted up and comes into contact with a valve support in the conventional gas compressor of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Front head 3 Compressor main body 4 Vane groove 5 Front side block 6 Rear side block 7 Cylinder block 7a Discharge hole 7c Valve mounting part 8 Cylinder chamber 9 Rotor 13 Vane 14 Compression chamber 15 Suction chamber 16 Suction port 17 Oil separator 18 Discharge chamber 19 Exhaust port 20 Oil storage chamber 22 Lead 22a Thin layer 23 Valve support 23a Straight section 23b Curved section 25 Sarai groove 28 Bolt P0 Bending starting point P1 Inflection section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F16K 15/16 F16K 15/16 DF term (reference) 3H003 AA05 AB06 AC03 AD03 CC12 CD03 3H029 AA05 AB03 BB44 CC03 CC15 CC25 CC39 3H040 AA09 BB05 BB11 CC14 DD02 DD16 DD23 DD28 DD36 3H058 AA15 BB21 CA24 CD13 EE13 EE17

Claims (8)

[Claims] 1. A flow path member having an outflow hole, comprising: a lead that opens and closes the outflow hole by a pressure difference between the outside and the inside of the flow member having an outflow hole. The surface facing the member is
A reed valve characterized by being coated with a thin layer of a fluororesin. 2. A lead that contacts and separates from the outside of the flow path member to open and close the outflow hole due to a pressure difference between the outside and the inside of the flow path member having the outflow hole, A valve support fixedly disposed with respect to the flow path member so that the valve support can be contacted from the opposite side, and a facing portion of the lead facing the valve support, and a facing portion of the valve support facing the lead. A reed valve, wherein at least one of the portions of the reed facing the flow path member has a surface coated with a thin layer of a fluororesin. 3. A method according to claim 1, further comprising: a fixed end fixed to a flow path member having an outflow hole for the fluid therein; and a free end disposed opposite to the fixed end with respect to the outflow hole. A free end side contacts and separates from the flow path member due to a flow pressure difference between the outside and the inside of the path member, and a lead that opens and closes the outflow hole. A valve support fixed to the flow path member, wherein the valve support has a larger radius of curvature on the side facing the free end than on the side facing the fixed end of the lead. A reed valve having an inflection portion. 4. A surface of at least one of a portion of the lead facing the valve support, a portion of the valve support facing the lead, and a portion of the lead facing the flow path member has a surface of fluorine. The reed valve according to claim 3, wherein the reed valve is covered with a thin layer of a resin. 5. The reed valve according to claim 1, wherein the thin layer has a thickness of 3 to 50 μm. . 6. A reed valve according to any one of claims 1 to 5, a compression chamber for compressing a gas, and discharging the gas compressed from the compression chamber to the outside. A gas compressor comprising: a cylinder as the flow path member having a discharge hole as the outflow hole. 7. A cylinder having a compression chamber for compressing a gas, and a discharge hole for discharging the gas compressed from the compression chamber to the outside, and a pressure difference between the outside and the inside of the discharge hole of the cylinder. And a lead for opening and closing the discharge hole in contact with and separating from the cylinder, and a surface of a portion of the cylinder facing the lead is covered with a thin layer of a fluorine-based resin. 8. The gas compressor according to claim 7, wherein the thin layer has a thickness of 3 to 50 μm.