JP4429827B2 - Check valve and gas compression device equipped with check valve - Google Patents

Description

  The present invention relates to a check valve that communicates with a suction chamber that sends refrigerant gas to a compression chamber and is installed in a suction port through which refrigerant gas is sucked from the outside as the rotor rotates, and a gas including the check valve The present invention relates to a compression device.

  Refrigerant gas circulation to air conditioning equipment (condenser, evaporator, etc.) installed in the air conditioning system is realized by compressing refrigerant gas (for example, alternative chlorofluorocarbon gas) for residential or vehicle air conditioning systems A gas compressor is provided.

  Various driving systems such as a reciprocating type and a rotary type are realized in the gas compressor. In any driving system, in the driving process, the refrigerant gas introduced into the compression chamber is supplied to the compression chamber. The structure is compressed by volume fluctuation (volume reduction).

  As shown in FIG. 6, at the end of the compression chamber of the gas compressor and upstream (intake) of the refrigerant gas, the refrigerant gas R communicates with the compression chamber 1 and circulates in the air conditioning system. A suction port 3 to which the refrigerant gas R is supplied is formed. The suction chamber 2 and the suction port 3 communicate with each other. The suction port 3 allows the supplied refrigerant gas R to flow into the suction chamber 2, and the refrigerant gas R from the suction chamber 2 to the suction port 3. Is provided with a check valve 4 for preventing the reverse flow of the gas.

  As shown in FIG. 7, the check valve 4 includes a cylindrical stopper 6, a valve body 7 that presses against the lower end of the stopper 6, a spring 8 that biases the valve body 7 upward, and a valve body 7. A case 9 for housing the spring 8 is provided.

  A stepped portion 6 a is formed at the lower outer periphery of the stopper 6, and the stepped portion 6 a is in contact with the peripheral edge portion 9 b of the upper opening 9 a of the case 9. The upper opening 9a of the case 9 has a circular diameter that allows the lower end 6b of the stopper 6 to be fitted therein. A plurality of openings 10 for communicating the suction port 3 and the suction chamber 2 are formed on the outer peripheral surface of the case 9, and the refrigerant gas R is discharged from the bottom of the case 9 on the bottom surface. A gas vent 9c is formed.

  The valve body 7 has an outer diameter that is substantially the same as the inner diameter of the case 9, and a recess 7 b in which the upper part of the spring 8 is accommodated is formed at the bottom.

  When the check valve 4 having the above components (6 to 9) is assembled, the lower end portion 6b of the stopper 6 is fitted into the upper opening 9a of the case 9 in a state where the valve body 7 and the spring 8 are accommodated, and the spring The valve body 7 pushed upward by the urging force 8 is brought into pressure contact with the lower end portion 6 b of the stopper 6.

  In the check valve 4 installed in the suction port 3, when the internal pressure of the suction chamber 2 is higher than the supply pressure of the refrigerant gas R, or the supply pressure of the refrigerant gas R is higher than the internal pressure with the suction chamber 2. When the pressure difference is smaller than the biasing force of the spring 8, the valve body 7 is abutted against the stopper 6 by the biasing force of the spring 8, as shown in FIG. 3 is blocked, and the backflow of the refrigerant gas R from the suction chamber 2 to the suction port 3 is prevented.

On the other hand, when the supply pressure of the refrigerant gas R is higher than the internal pressure with the suction chamber 2 and the pressure difference is larger than the urging force of the spring 8, as shown in FIG. Is pushed downward against the urging force of the spring 8, and the upper surface 7c of the valve body 7 is displaced below the upper end portion 10a of the opening 10 of the case 9, whereby the suction port 3 and the suction chamber 2 communicate with each other. Then, the refrigerant gas R supplied to the suction port 3 flows into the suction chamber 2.
JP 2002-257046 A

  However, as shown in FIG. 7, the stopper 6 is formed of a cylindrical body having a constant diameter, so that the flow rate of the cooling gas R sucked into the gas compressor body through the suction port 3 is the rotor flow rate. It increases in proportion to the rotation speed. For this reason, when the rotor is rotated at a high speed, the refrigerant gas R that is larger than the amount of refrigerant gas R that is originally required may be sucked into the gas compressor, resulting in unnecessary energy consumption from the viewpoint of energy efficiency. was there. On the other hand, if the diameter of the stopper 6 is reduced in order to reduce wasteful energy consumption, it becomes difficult to sufficiently suck the refrigerant gas R into the gas compressor when the rotor is rotated at a low speed. There was a possibility that cooling capacity might fall.

  The present invention has been made in view of the above problems, and provides a check valve capable of sucking an appropriate flow rate of refrigerant gas in accordance with the rotational speed of a rotor, and a gas compressor including the check valve. The issue is to provide.

  In order to solve the above-described problems, a check valve according to the present invention communicates with a suction chamber that sends refrigerant gas to a compression chamber, and is installed in a suction port through which refrigerant gas is sucked from the outside as the rotor rotates. The check valve is configured to prevent the refrigerant gas from being sucked into and sucked into the suction chamber by being in pressure contact with the stopper, and separated from the stopper. And a valve body that allows the refrigerant gas to flow into the suction chamber, and the inside of the stopper has an inclined surface with an enlarged diameter from a middle portion of the stopper to the outer end portion. A diameter-expanding space is provided, and the diameter-expanded space is a diameter capable of changing the inside diameter of the refrigerant gas inflow hole in the diameter-expanding space by sliding on the inclined surface according to the rotational speed of the rotor. That a variable member is provided. And butterflies.

Moreover, the diameter varying member, the ring-shaped member and a ring piece member that is divided into a plurality, and a rod-shaped elastic springs which are inserted into a hole portion extending in the center portion toward the peripheral direction of the ring piece member The diameter-variable member in which the rod-shaped elastic spring is inserted into the hole and the ring- shaped member is formed into an annular shape by the plurality of ring piece members is expanded in diameter by the elastic force of the rod-shaped elastic spring. The inner diameter of the inflow hole is increased or decreased in accordance with a strength relationship between a force and a suction pressure applied to the upper surface of the ring piece member by the refrigerant gas sucked as the rotor rotates.

  Furthermore, the gas compression apparatus provided with the above-described check valve also corresponds to the present invention.

  According to the check valve and the gas compression apparatus including the check valve according to the present invention, when the rotational speed of the rotor is low, the inner diameter of the variable diameter member is increased to correspond to the rotational speed of the rotor. The rate of increase / decrease in the amount of refrigerant gas sucked in can be increased, and when the rotational speed of the rotor becomes medium, the inner diameter of the variable diameter member is increased / decreased according to the rotational speed. The refrigerant gas suction amount optimal for rotation can be maintained. Further, when the rotational speed of the rotor becomes high, the inner diameter of the variable diameter member is reduced to reduce the rate of change in the refrigerant gas suction amount. Therefore, it is possible to adjust the refrigerant gas suction amount required according to the rotational speed of the rotor, and to prevent wasteful energy consumption.

  Hereinafter, a gas compression apparatus provided with a check valve according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side sectional view showing a rotary compressor 20 used in an air conditioning system for a vehicle, which is a gas compressor provided with a check valve according to the present invention.

  As shown in FIG. 1, the rotary compressor 20 includes a front side block 21, a rear side block 22, a cylinder 23, a rotor 24, and a vane 25 provided in the rotor 24, and the cylinder 23, the rotor 24, and the vane 25. The refrigerant gas R in the compression chamber 1 is compressed by reducing the volume of each of the plurality of compression chambers 1 surrounded by the rotation of the rotor 24.

  The front side block 21 is formed with a suction port (not shown) through which the refrigerant gas R introduced into the suction chamber 2 is introduced into the compression chamber 1 in the suction stroke. Further, a discharge hole (not shown) through which the refrigerant gas R compressed in the discharge stroke of the refrigerant gas R is discharged from the compression chamber 1 is formed in the cylinder 23, and a discharge valve (not shown) is formed in the discharge hole. ) Is provided.

  The rear side block 22 is formed with a discharge port serving as a flow path for the refrigerant gas R discharged from the discharge valve of the cylinder 23. Further, outside the rear side block 22, the refrigerant gas R discharged from the discharge port is mixed. A cyclone block 28 having a separator wire mesh 27 for separating the refrigerating machine oil L from the refrigerant gas R is attached.

  The front side block 21, the rear side block 22, the cylinder 23, the rotor 24, and the shaft 29 constitute a compressor body 30, and the compressor body 30 and the cyclone block 28 are covered with a front head 31 and a case 32.

  A rotational force is applied to the rotor 24 from an electric motor (not shown) through a power transmission belt 34, a power transmission mechanism 35, and a shaft 29 that is pivotally supported by the front side block 21 and the rear side block 22. The power transmission mechanism 35 includes a pulley 36 around which a power transmission belt 34 is wound and supported by the front head 31 via a radial bearing, and a connecting plate 37 that connects the shaft 29 and the pulley 36.

  On the other hand, a suction chamber 2 is formed between the front head 31 and the front side block 21, leading to the suction port of the front side block 21 and upstream of the refrigerant gas R with respect to the compression chamber 1. The front head 31 is formed with a suction port 3A to which the refrigerant gas R is supplied from the outside of the compressor 20, that is, an evaporator of the air conditioning system, and the case 32 is compressed by the outside of the compressor 20, that is, a condenser of the air conditioning system. A discharge port 40 for discharging the refrigerant gas R having a high pressure is formed.

  The suction port 3A is provided with a check valve 41, and the suction port 3A communicates with the suction chamber 2 through the check valve 41.

  As shown in FIG. 2, the check valve 41 includes a stopper 42 whose upper opening diameter R1 is wider than the middle diameter R2, a valve main body 43 that presses against the lower end of the stopper 42, and a valve main body. A spring 44 that urges 43 upward, and a case 45 that houses the valve main body 43 and the spring 44 are provided.

  The inner peripheral upper portion of the stopper 42 is provided with a diameter expansion space 49 in which the diameter is enlarged from the middle portion to the upper portion to form an inclined surface 48, and a diameter variable member 50 described later is provided in the diameter expansion space 49. Is provided. A stepped portion 42 a is formed at the lower outer periphery of the stopper 42, and the stepped portion 42 a abuts on the peripheral edge 45 b of the case 45 upper opening 45 a.

  The upper opening 45a of the case 45 has an inner diameter that allows the lower end portion 42a of the stopper 42 to be fitted therein. A plurality of openings 46 for communicating the suction port 3A and the suction chamber 2 are formed on the outer peripheral surface of the case 45, and the bottom surface of the case 45 is used for discharging the refrigerant gas R from the bottom of the case 45. A gas vent 45c is formed.

  The valve main body 43 has an outer diameter that is substantially the same as the inner diameter of the case 45, and a recess 43 b in which the upper portion of the spring 44 is accommodated is formed at the bottom. When the check valve 41 made up of each part is assembled, the check valve 41 is inserted into the upper opening 45a of the case 45 with the lower end portion 42a of the stopper 42 in a state where the valve main body 43 and the spring 44 are accommodated. The valve body 43 pushed upward by the urging force 44 is brought into pressure contact with the lower end portion 42 b of the stopper 42.

Diameter varying member 50, as shown in FIG. 3 (a) (b), is configured annular member by 4 divided ring plate assembly 51, the ring piece member 51, FIG. 3 (c) (d ), An upper surface 52a and a lower surface 52b forming horizontal planes parallel to each other, an inner surface 52c perpendicular to the upper surface 52a and the lower surface 52b, and an outer surface 25d sliding on the inclined surface 48 of the stopper 42. . Both end faces 53a of the ring piece member 51, the 53b, the ring piece has a substantially central portion of the member 51 hole 54 which extends in the circumferential direction is formed, the hole portion 54, the elastic rod-shaped spring 55 inserted Is done. When the elastic rod-shaped spring 55 is inserted into the hole 54 of the adjacent ring piece member 51 to form an annular shape by the four ring piece members 51, the ring piece member 51 is caused by the elastic force of the elastic rod-shaped spring 55. When to spread the radial direction of the annular shape (diameter force is generated), so to expand the inner diameter of the diameter varying member 50.

When the diameter variable member 50 is installed in the diameter expansion space 49 of the stopper 42 as shown in FIG. 3B, the rotation of the rotor 24 stops and the refrigerant gas R is not sucked. When the rotation speed of the rotor 24 is low and the suction flow rate of the refrigerant gas R is low, the inner diameter (inner diameter of the refrigerant gas inflow hole) of each ring piece member 51 is expanded in the radial direction by the elastic force of the elastic rod-shaped spring 55. the outer surface 52d slides on the inclined surface 48 Te, each ring piece member 51, the diameter space 49 rises top 52a the outer peripheral edge portion of the upper ring piece to the regulating frame 56 which is formed in the part member 51 of the stopper 42 To stop at the top of the stopper 42. In this case, as shown in FIG. 3A, each ring piece member 51 expands in the radial direction and the inner diameter (inlet hole inner diameter) of the diameter variable member 50 increases (inner diameter L1). It becomes possible to increase the intake amount of the gas R.

On the other hand, when the rotation speed of the rotor 24 is inspiratory flow rate of the refrigerant gas R a fast is fast, hit refrigerant gas R to the upper surface 52a of the ring piece member 51, and will push down the ring piece member 51 downward To do. When the refrigerant gas R is the pressure to be push down the ring piece member 51 (suction pressure) is stronger than the force elastic force of the elastic rod-shaped spring 55 attempts to increase the respective ring piece member 51, FIG. 3 ( As shown in d), the ring piece member 51 stopped at the top of the stopper 42 is pushed down to the middle of the stopper 42. In this case, as shown in FIG. 3B, the ring piece members 51 approach each other and try to narrow the interval, so that the inner diameter of the diameter variable member 50 is reduced (inner diameter L <b> 2), and the refrigerant gas R that passes through the stopper 42. The amount of inhalation is limited.

  FIG. 4 is a graph showing the relationship between the rotational speed of the rotor 24 and the intake amount of the refrigerant gas R. The rotational speed A of the rotor 24 is the rotational speed at which the variable diameter member 50 starts to descend in the stopper 42. The rotation speed B indicates the rotation speed at which the diameter variable member 50 descends to the bottom of the stopper 42 and stops.

  When the rotation speed of the rotor 24 is 0 to A (when the rotation speed is low), the diameter variable member 50 is positioned above the stopper 42 and maintains the inner diameter L1, so the rotation speed of the rotor 24 is increased. The increase rate of the suction amount of the refrigerant gas R corresponding to the above can be made the same as the increase / decrease rate of the suction amount of the refrigerant gas R passing through the conventional stopper 6.

  When the rotational speed of the rotor 24 is between A and B (when the rotational speed is a medium speed), the diameter variable member 50 descends in proportion to the rotational speed. It is possible to continuously increase / decrease the hole inner diameter) according to the rotational speed of the rotor, and to appropriately change the refrigerant gas suction amount increase / decrease rate according to the rotational speed.

  Further, when the rotational speed of the rotor 24 is equal to or higher than B, the inner diameter (inflow hole inner diameter) of the diameter variable member 50 is fixed to the inner diameter L2, so that the suction of the refrigerant gas R corresponding to the rotational speed of the rotor 24 is performed. It becomes possible to limit the rate of increase / decrease in the amount compared to the case of the inner diameter L1.

  As described above, by using the gas compression device 20 including the suction port 3A according to the present invention, when the rotational speed of the rotor 24 is low, the inner diameter of the variable diameter member 50 is increased to increase the refrigerant gas R. Increase / decrease rate of the inflow amount can be increased. Further, when the rotational speed of the rotor 24 becomes medium speed, the flow rate of the refrigerant gas optimal for the rotation of the rotor 24 is maintained by increasing or decreasing the inner diameter of the diameter variable member 50 according to the rotational speed. Can do. Further, when the rotational speed of the rotor 24 is increased, the inner diameter of the diameter variable member 50 can be reduced to reduce the rate of increase or decrease in the intake amount of the refrigerant gas R.

  As described above, by using the diameter variable member 50 according to the present invention, it is possible to adjust the suction amount of the refrigerant gas R according to the rotational speed of the rotor 24, thereby preventing wasteful energy consumption. Is possible.

  Further, since the inner diameter of the diameter variable member 50 is changed according to the rotational speed of the rotor 24, it is possible to suck a sufficient amount of refrigerant gas even when the rotor 24 rotates at a low speed. Cooling capacity can be secured.

In addition, the structure of the diameter variable member 50 according to the present invention is not limited to the above-described structure, and can be changed to a shape, a structure, or the like as long as the same effect as the effect described in the above embodiment is achieved. Even if it adds, it is included in this invention. For example, as shown in FIG. 5, a spring 58 is installed below the ring piece member 51, the diameter variable member 50 is raised by the urging force of the spring 58 and the inner diameter is enlarged, and the spring is driven by the flow pressure of the refrigerant gas R. The structure may be such that the inner diameter of the diameter variable member 50 is reduced by pushing down 58.

It is sectional drawing which showed the gas compressor provided with the suction port which concerns on this invention. FIG. 2 is a developed side view of the check valve shown in FIG. 1. It is the figure which showed the stopper and diameter variable member which are shown in FIG. 2, (a) is a top view which showed the diameter variable member when an internal diameter expands, (b) is a diameter when an internal diameter becomes narrow. It is the top view which showed the variable member, (c) is sectional drawing which looked at the AA line of (a) from the arrow direction, (d) is the BB line of (b) seen from the arrow direction. FIG. 6 is a graph showing the relationship between the rotational speed of the rotor and the amount of refrigerant gas sucked. It is the figure which showed the other stopper and the diameter variable member, (a) is a top view which showed the diameter variable member, (b) is sectional drawing which looked at CC line of (a) from the arrow direction And It is sectional drawing which showed the non-return valve in the conventional gas compressor. It is the expansion | deployment side view which showed the conventional check valve. It is sectional drawing which showed the drive condition of the conventional non-return valve, Comprising: (a) shows the time of closing of a valve main body, (b) shows the time of opening of a valve main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compression chamber 2 Suction chamber 3, 3A Suction port 6, 42 Stopper 7, 43 Valve main body 24 Rotor 48 Inclined surface 49 Expanded space 50 Diameter variable member

Claims (3)

A check valve that communicates with a suction chamber that sends refrigerant gas to the compression chamber, and that is installed at a suction port through which refrigerant gas is sucked from the outside as the rotor rotates;
The check valve includes a stopper communicating with the outside, and prevents suction and backflow of the refrigerant gas into the suction chamber by being in pressure contact with the stopper, and the suction chamber of the refrigerant gas is separated from the stopper. A valve body that allows inflow to
Inside the stopper, there is provided an enlarged space in which the diameter is enlarged from the middle part of the stopper to the outer side end part to form an inclined surface,
The diameter-expanding space is provided with a variable diameter member capable of changing the inside diameter of the refrigerant gas inflow hole in the diameter-expanding space by sliding on the inclined surface according to the rotational speed of the rotor. Characteristic check valve. The diameter varying member includes the ring-shaped member and a ring piece member that is divided into a plurality, and a rod-shaped elastic springs which are inserted into a hole portion extending in the center portion toward the peripheral direction of the ring piece member ,
A diameter force said diameter varying member which forms a ring shape by the plurality of ring pieces member the rod-shaped elastic spring is inserted into the hole portion, when you to spread radially by the elastic force of the rod-shaped elastic springs, The inflow hole inner diameter expands or contracts according to a strength relationship with a suction pressure applied to the upper surface of the ring piece member by the refrigerant gas sucked as the rotor rotates. Check valve.   A gas compression apparatus comprising the check valve according to claim 1.

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