JP6178281B2 - Throttle device and refrigeration cycle system including the same - Google Patents

Description

  The present invention relates to a throttling device and a refrigeration cycle system including the same.

  As a refrigeration cycle system in an air conditioner, a system having a differential pressure type throttle device instead of a capillary tube as a throttle device has been proposed. For example, as shown in Patent Documents 1 to 4, a differential pressure type throttling device adjusts the refrigerant pressure between the condenser outlet and the evaporator inlet in order to operate the compressor efficiently according to the outside air temperature. Even in the refrigeration cycle system that can optimally control and change the rotational speed of the compressor, the refrigerant pressure according to the rotational speed of the compressor is optimally controlled from the viewpoint of labor saving. For example, the expansion device is joined to a primary side pipe connected to the condenser at one end where the refrigerant is introduced, and joined to a secondary side pipe connected to the evaporator at the other end where the refrigerant is discharged. ing.

  As shown in FIG. 1 of Patent Document 1, the differential pressure type throttling device includes a cylinder disposed in a pipe constituting the refrigerant flow path and a valve portion, each of which opens and closes a valve seat in a passage in the cylinder. A plurality of springs that urge the valve body of the first valve body and the second valve body, and the valve portions of the first valve body and the second valve body to be closed with respect to the valve seat, and the first valve body and the second valve; A shaft-shaped member having a tapered portion disposed in the contracted tube portion of the body and forming a throttle channel between the inner end edge portion of the contracted tube portion and the tapered portion, and a plurality of springs in contact with one end of each spring A plurality of stoppers for adjusting the elastic force of the shaft, and a set screw which is fitted in the female screw hole of the stopper and is positioned in the axial direction of the shaft-like member.

  In such a configuration, when the differential pressure before and after the throttle passage according to the design pressure of the refrigerant is less than a predetermined value, the valve portions of the first valve body and the second valve body are in a closed state with respect to the valve seat. Thus, the biasing force of the spring is adjusted by the stopper. At that time, when the valve portions of the first valve body and the second valve body are closed with respect to the valve seat, the position of the shaft-shaped member is set so that the size of the above-mentioned throttle channel becomes a predetermined size. , Adjusted by set screws. As a result, during cooling, the refrigerant passing through the passage in the cylinder is decompressed by the above-described throttle flow path and discharged from the cylinder. On the other hand, when the differential pressure before and after the throttle channel is equal to or greater than a predetermined value, the valve portion of the first valve body is opened with respect to the valve seat, and most of the refrigerant is The gas is discharged from the cylinder through the gap between the cylinder and the inner periphery of the cylinder and the long hole of the stopper.

JP 2005-265230 A Patent No. 489742 JP 2008-101733 A Japanese Patent No. 3537849

  When the refrigerant is filled in the refrigeration cycle system, the refrigerant is generally filled from the primary side piping side with respect to the expansion device. However, if the refrigerant is accidentally charged from the secondary side piping side with respect to the throttle device, or the refrigerant must be charged from the secondary side piping side due to system restrictions, or the refrigeration cycle system When an impact pressure is generated in which the pressure on the secondary side of the pipe suddenly increases depending on the operation state, the valve portion of the valve body as described above may be closed with respect to the valve seat and cannot be separated. As a countermeasure in such a case, it is conceivable to provide a check valve separately in the secondary side pipe so that the refrigerant is not charged from the secondary side pipe side, but the manufacturing cost is not good.

  In view of the above problems, the present invention is a throttling device and a refrigeration cycle system including the same, and even when an undesired pressure acts on the valve body from the secondary side piping side, An object of the present invention is to provide a throttling device that can prevent the valve portion of the body from biting into the valve seat and that does not increase the manufacturing cost, and a refrigeration cycle system including the same.

In order to achieve the above object, a throttling device according to the present invention is provided in a pipe supplying refrigerant and having a tube main body having open ends at both ends communicating with the pipe, and a valve port provided in the tube main body. Between the needle member and one of the open ends of the tube body, and a needle member having a taper that is arranged to be close to or away from the valve port of the valve seat and controls an opening area of the valve port And a biasing member for supporting one end of a biasing member that has a through-hole passing through an end face facing one open end of the tube body and biases the needle member in a direction approaching the valve port of the valve seat A member support portion, and a restriction valve having a bottom wall facing the through hole of the biasing member support portion and opening and closing the opening end of the through hole of the biasing member support portion. Acting on the bottom wall through the through hole of the support part According to the pressure of the refrigerant, the refrigerant flows out to the one opening end side separated from the through hole of the biasing member support portion, and the refrigerant pressure from one opening end portion of the tube main body acting on the bottom wall Accordingly, the bottom wall is brought into contact with the peripheral edge of the through hole of the biasing member support portion.

The urging member support portion may include a return spring that urges the restriction valve in a direction away from the opening end of the through hole of the urging member support portion .

  Furthermore, the refrigeration cycle system according to the present invention includes an evaporator, a compressor, and a condenser, and any one of the above-described throttle devices is disposed between the outlet of the condenser and the inlet of the evaporator. It is provided in the piping.

According to the throttling device and the refrigeration cycle system including the same according to the present invention, it is fixed between the needle member and one open end of the tube main body, and passes through the end face facing the one open end of the tube main body. A biasing member support that supports one end of a biasing member that biases the needle member in a direction close to the valve port of the valve seat, and a bottom facing the through hole of the biasing member support. And a restriction valve that opens and closes the opening end of the through hole of the biasing member support portion, and the restriction valve is a pressure of the refrigerant that acts on the bottom wall through the through hole of the biasing member support portion. In response to the pressure of the refrigerant from one of the opening ends of the tube main body that is separated from the through hole of the biasing member support portion and flows to the one opening end portion side and acts on the bottom wall. walls are in contact with the periphery of the through hole of the biasing member support In even when the undesired pressure from the secondary side piping side acts on the valve body, prevents the valve portion of the valve body bites into the valve seat, moreover, never increase the manufacturing cost.

(A) And (B) is sectional drawing which respectively shows the structure of 1st Example of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is a fragmentary sectional view shown along the II-II line in FIG. (A) is a top view of the restriction | limiting valve used in the example shown by FIG. 1 (A), (B) is sectional drawing shown along the IIIB-IIIB line | wire in (A). It is a figure showing roughly composition of an example of a refrigerating cycle system provided with the 1st example of an iris diaphragm concerning the present invention. (A) And (B) is sectional drawing which respectively shows the structure of 2nd Example of the aperture_diaphragm | restriction apparatus based on this invention. (A) And (B) is sectional drawing which respectively shows the structure of 3rd Example of the aperture_diaphragm | restriction apparatus based on this invention.

  FIGS. 1A and 1B show the configuration of a first embodiment of a diaphragm device according to the present invention.

  For example, as schematically shown in FIG. 4, the expansion device is disposed between the outlet of the condenser 6 and the inlet of the evaporator 2 in the piping of the refrigeration cycle system. The throttle device is joined to the primary side pipe Du1 at one end 10E1 of the tube body 10 to be described later, and joined to the secondary side pipe Du2 at the other end 10E2 of the tube body 10 from which the refrigerant is discharged. The primary side pipe Du1 connects the outlet of the condenser 6 and the throttle device, and the secondary side pipe Du2 connects the inlet of the evaporator 2 and the throttle device. Between the outlet of the evaporator 2 and the inlet of the condenser 6, as shown in FIG. 4, a pipe Du3 joined to the outlet of the evaporator 2, and a pipe Du4 joined to the inlet of the condenser 6 Thus, the compressor 4 is connected. The compressor 4 is driven and controlled by a control unit (not shown). Thereby, the refrigerant | coolant in a refrigerating-cycle system will be circulated along the arrow shown by FIG. 4, for example.

  The throttle device includes a tube main body 10 joined to the piping of the above-described refrigeration cycle system, a valve seat 22 that is fixed to the inner peripheral portion of the tube main body 10 and adjusts the flow rate of the refrigerant, and a needle member 20, a coil spring 16 that urges the needle member 20 toward the valve seat 22, a spring receiving portion 12 that supports one end of the coil spring 16, and a movement adjacent to the spring receiving portion 12. A restriction valve 24 that restricts the flow of the refrigerant in one direction so as to prevent the pressure from the other end 10 </ b> E <b> 2 from acting on the needle member 20 is configured as a main element.

  The tube body 10 having a predetermined length and diameter is made of, for example, a copper pipe or an aluminum pipe, and is joined to the primary side pipe Du1 connected to the condenser at one end 10E1 into which the refrigerant is introduced. The other end 10E2 from which the refrigerant is discharged is joined to the secondary side pipe Du2 connected to the evaporator.

  The outer peripheral portion of the valve seat 22 is fixed to an intermediate portion that is separated from the one end 10E1 in the inner peripheral portion of the tube main body 10 by a predetermined distance. The valve seat 22 is fixed by a protrusion formed by the depression 10CA3 of the tube main body 10 by caulking, biting into the outer peripheral portion thereof.

  The cylindrical valve seat 22 has a valve port 22a into which a tapered portion 20P in a needle member 20 to be described later is inserted in the center of the inside. The valve port 22a has a predetermined diameter φD and extends toward the one end 10E1 along the central axis of the valve seat 22.

As shown in FIG. 2, a cylindrical needle member 20 having a flat surface facing each other in cross section is made of, for example, brass or stainless steel, and has a tapered portion 20P at the end facing the valve seat 22 and a coil. A protruding spring receiving portion 12 is provided at an end facing the other end of the spring 16. As shown in FIG. 2, a flow path 10a is formed between the flat surface of the outer peripheral portion of the portion between the tapered portion 20P and the spring guide portion 20D of the needle member 20 and the inner peripheral portion of the tube body 10. Has been.

  The frustoconical taper 20P has a taper angle. Further, the end face of the tapered portion 20P has a diameter φa that is smaller than the diameter φD. After the outer peripheral portion of the tapered portion 20P of the needle member 20 comes into contact with the peripheral edge of the opening end portion of the valve port 22a to close the valve port 22a, the outer peripheral portion of the tapered portion 20P of the needle member 20 The separation start timing at which separation starts with respect to the peripheral edge of the opening end of the valve port 22a due to the difference between the refrigerant inlet pressure on the 10E1 side and the refrigerant outlet pressure on the other end 10E2 side is based on the biasing force of the coil spring 16. Is set. The spring constant of the coil spring 16 is set to a predetermined value.

  When the outer peripheral portion of the tapered portion 20P of the needle member 20 is separated from the peripheral edge of the opening end portion of the valve port 22a, there is a restriction between the tapered portion 20P of the needle member 20 and the opening end portion of the valve port 22a. Part is formed. The throttle portion refers to a portion (narrowest portion) where the intersection of the perpendicular line from the peripheral edge of the valve port 22a to the bus bar of the tapered detail 20P and the bus bar of the tapered detail 20P is closest to the edge 22as of the valve port 22a. The area of the conical surface drawn by the perpendicular is the opening area of the diaphragm.

  The other end portion of the coil spring 16 is engaged with the spring guide portion 20 </ b> D of the needle member 20. Further, the tapered portion 12 b of the spring receiving portion 12 is engaged with one end portion of the coil spring 16.

  The spring receiving portion 12 as the urging member support portion has a through hole 12a at the inner center portion. The spring receiving portion 12 is fixed by biting a protrusion formed by the depression 10CA2 of the tube main body 10 by caulking.

  The end of the secondary side pipe Du2 is positioned by a positioning projection 10CA1 of the tube body 10 described later. As shown in FIGS. 1A and 1B, a restriction valve 24 is movably disposed between the positioning projection 10CA1 and the spring receiving portion 12.

  3A and 3B, the restriction valve 24 is made of a thin metal plate material such as stainless steel into a thin cylindrical shape such as a beaker. The side wall 24A is in sliding contact with the surface, and the bottom wall 24B is formed integrally with one end of the side wall 24A. The bottom wall 24 </ b> B faces the spring receiving portion 12 and is disposed so as to be close to or separated from the spring receiving portion 12. The bottom wall 24B has four holes 24b evenly on a common circumference. The diameter of the hole 24 b is set smaller than the diameter of the through hole 12 a of the spring receiving portion 12. However, the total opening area obtained by adding the opening areas of the four holes 24b is set to be larger than the opening area of the through hole 12a so as not to inhibit the flow of the refrigerant. In addition, when the total opening area which totaled the opening area of the four holes 24b is set so that it may become larger than the opening area of the through-hole 12a, the shape and quantity of the hole are restricted to such an example. It may be changed without any change.

  Therefore, as shown in FIG. 1A, when the bottom wall 24B of the restriction valve 24 is brought into contact with the peripheral edge of the through hole 12a of the spring receiving portion 12, the central portion of the bottom wall 24B is the spring receiving portion 12. This will close the through hole 12a. On the other hand, as shown in FIG. 1B, when the bottom wall 24B of the restriction valve 24 is separated from the peripheral edge of the through hole 12a of the spring receiving portion 12, the center portion of the bottom wall 24B The through hole 12a is opened. At that time, the restriction valve 24 is engaged with the positioning protrusion 10CA1 to restrict movement over a predetermined distance.

  In such a configuration, as shown in FIG. 1B, the refrigerant is supplied along the direction indicated by the arrow through the primary side pipe Du <b> 1, and the force acting on the needle member 20 due to the pressure of the refrigerant is applied to the coil spring 16. When exceeding the urging force, the refrigerant flowing through the through hole 12a of the throttle part and the spring receiving part 12 presses the bottom wall 24B of the restriction valve 24 in a direction away from the peripheral edge of the through hole 12a of the spring receiving part 12. Become. Thus, the refrigerant is discharged to the secondary side pipe Du2 through the holes 24b of the bottom wall 24B of the restriction valve 24. If the restriction valve 24 is in the state shown in FIG. 1B, the refrigerant pressure acts on the bottom wall 24B in the direction in which the restriction valve 24 comes close to the spring receiving portion 12 through the secondary side pipe Du2. Even when this is done, since the central portion of the bottom wall 24B of the restriction valve 24 closes the through hole 12a of the spring receiving portion 12, an undesired pressure acts on the needle member 20, and the tapered portion 20P of the needle member 20 Biting into the open end of the valve port 22a of the valve seat 22 is avoided.

  5A and 5B show the configuration of the second embodiment of the diaphragm apparatus according to the present invention.

  In the first embodiment shown in FIG. 1A, when the force acting on the needle member 20 due to the pressure of the refrigerant exceeds the urging force of the coil spring 16, the restriction valve 24 has a bottom wall of the restriction valve 24. By pressing 24B in a direction away from the periphery of the through hole 12a of the spring receiving portion 12, the restriction valve 24 is separated from the periphery of the through hole 12a. Instead, FIGS. ), Even if the force acting on the needle member 20 due to the pressure of the refrigerant is less than the urging force of the coil spring 16, the urging force of the return spring 26 causes the limiting valve 24 to automatically increase in diameter. It shall return to the state spaced apart with respect to the periphery of the part 32b. 5 (A) and 5 (B), the same components in the example shown in FIGS. 1 (A) and 1 (B) are denoted by the same reference numerals, and redundant description thereof is omitted.

  The expansion device is disposed, for example, between the outlet of the condenser 6 and the inlet of the evaporator 2 in the piping of the refrigeration cycle system shown in FIG.

  The throttle device includes a tube main body 10 joined to the piping of the above-described refrigeration cycle system, a valve seat 22 that is fixed to the inner peripheral portion of the tube main body 10 and adjusts the flow rate of the refrigerant, and a needle member 20, a coil spring 16 that urges the needle member 20 toward the valve seat 22, a spring receiving portion 32 that supports one end of the coil spring 16, and a movement adjacent to the spring receiving portion 32. The restriction valve 24 that restricts the flow of the refrigerant in one direction so that the pressure from the other end 10E2 side does not act on the needle member 20 and the restriction valve 24 that is separated from the spring receiving portion 32 are attached. And a return spring 26 to be energized.

  The spring receiving portion 32 has a large-diameter portion 32b that accommodates the end portion of the return spring 26 and a small-diameter portion 32a that is continuous with the large-diameter portion 32b in the inner central portion. The spring receiving portion 32 is fixed by biting a protrusion formed by the depression 10CA2 of the tube body 10 by caulking. One end of the coil spring 16 is fitted into the lower end portion 32 c forming the truncated cone shape of the spring receiving portion 32. One end of the return spring 26 is in contact with the bottom wall 24B of the restriction valve 24, and the other end of the return spring 26 is received by a step portion between the large diameter portion 32b and the small diameter portion 32a. The urging force of the return spring 26 is set to be greater than the weight of the limiting valve 24. As a result, a predetermined gap is formed between the outer peripheral surface of the bottom wall 24B of the restriction valve 24 and the open end periphery of the large diameter portion 32b.

  In such a configuration, as shown in FIG. 5B, the refrigerant is supplied along the direction indicated by the arrow through the primary side pipe Du <b> 1, and the force acting on the needle member 20 due to the pressure of the refrigerant is applied to the coil spring 16. When exceeding an urging | biasing force, it flows through the above-mentioned aperture | diaphragm | squeeze part, the small diameter part 32a of the spring receiving part 32, and the large diameter part 32b. At that time, in a state where a predetermined gap is formed between the outer peripheral surface of the bottom wall 24B of the restriction valve 24 and the opening end periphery of the large diameter portion 32b, the bottom wall 24B of the restriction valve 24 is spring-loaded by the refrigerant. Further pressing is performed in a direction away from the peripheral edge of the opening end of the large-diameter portion 32 b of the receiving portion 32. Thus, the refrigerant is discharged to the secondary side pipe Du2 through the holes 24b of the bottom wall 24B of the restriction valve 24. In the case where the restriction valve 24 is in the state shown in FIG. 5B, the pressure of the refrigerant supplied through the secondary side pipe Du2 should spring against the urging force of the return spring 26. Even when acting on the bottom wall 24B in a direction approaching the receiving portion 32, the center portion of the bottom wall 24B of the restriction valve 24 closes the open end of the large diameter portion 32b of the spring receiving portion 32, so that the needle It is avoided that an undesired pressure acts on the member 20 and the tapered portion 20P of the needle member 20 bites into the open end of the valve port 22a of the valve seat 22. Thereafter, when the force due to the pressure of the refrigerant supplied through the secondary side pipe Du2 falls below the urging force of the return spring 26, the restricting valve 24 automatically causes the large diameter portion 32b by the urging force of the return spring 26. It returns to the state separated with respect to the peripheral edge.

  6A and 6B show the configuration of a third embodiment of the diaphragm apparatus according to the present invention.

  In the example shown in FIGS. 1 (A) and 1 (B), it is assumed that a restriction valve 24 made of a thin cylindrical shape such as a beaker is provided, but instead of FIGS. 6 (A) and (B). In the example shown in (2), a restriction valve 40 that is a strip-shaped piece and opens and closes the opening end of the through hole 42a of the spring receiving portion 42 is provided. 6 (A) and 6 (B), the same components in the example shown in FIGS. 1 (A) and 1 (B) are denoted by the same reference numerals, and redundant description thereof is omitted.

  The expansion device is disposed, for example, between the outlet of the condenser 6 and the inlet of the evaporator 2 in the piping of the refrigeration cycle system shown in FIG.

  The throttle device includes a tube main body 10 joined to the piping of the above-described refrigeration cycle system, a valve seat 22 that is fixed to the inner peripheral portion of the tube main body 10 and adjusts the flow rate of the refrigerant, and a needle member 20, a coil spring 16 that urges the needle member 20 toward the valve seat 22, a spring receiving portion 42 that supports one end of the coil spring 16, and a tube body disposed on the spring receiving portion 42. 10 includes a limiting valve 40 that restricts the flow of the refrigerant in one direction so that the pressure from the other end 10E2 side of 10 does not act on the needle member 20.

  The spring receiving portion 42 has a through hole 42a in the inner central portion. The spring receiving portion 42 is fixed by biting a protrusion formed by the depression 10CA2 of the tube body 10 by caulking. One end of the coil spring 16 is fitted into the lower end portion 42b of the spring receiving portion 42 forming a truncated cone shape. A restriction valve 40 is provided at the opening end of the tube body 10 at the other end 10E2 side in the through hole 42a so that the through hole 42a can be opened and closed. The restriction valve 40 is made of, for example, a thin plate metal material or a thin plate resin material. The base end of the restriction valve 40 is fixed at a position separated by a predetermined distance from the opening end of the spring receiving portion 42 with a small screw BS1. The contact portion formed at the other end of the restriction valve 40 is rotatable around its proximal end, and returns to the initial position so as to close the opening end portion of the through hole 42a by its own restoring force. It abuts on the periphery of the opening end of the hole 42a.

In such a configuration, as shown in FIG. 6B, the refrigerant is supplied along the direction indicated by the arrow through the primary side pipe Du <b> 1, and the force acting on the needle member 20 due to the pressure of the refrigerant is applied to the coil spring 16. When the urging force is exceeded, the refrigerant flowing through the through hole 42a of the throttle part and the spring receiving part 42 presses the other end of the restriction valve 40 in a direction away from the peripheral edge of the through hole 42a of the spring receiving part 42. . Thereby, the refrigerant is discharged to the secondary side pipe Du2 through the gap between the other end of the restriction valve 40 and the peripheral edge of the through hole 42a of the spring receiving portion 42. If the restriction valve 40 is in the state shown in FIG. 6 (B), the other end of the restriction valve 40 should be placed in the direction in which the other end of the restriction valve 40 comes close to the spring receiving portion 42 through the secondary pipe Du2. 6A, as shown in FIG. 6A, the other end of the restriction valve 40 closes the opening end of the through hole 42a of the spring receiving portion 42, which is undesirable for the needle member 20. It is avoided that the taper 20P of the needle member 20 bites into the open end of the valve port 22a of the valve seat 22 due to the pressure.

10 Tube body 12, 32, 42 Spring receiving portion 20 Needle member 22 Valve seat 24, 40 Limit valve 26 Return spring

Claims (3)

A tube main body that is arranged in a pipe for supplying a refrigerant and has open ends at both ends communicating with the pipe;
A valve seat disposed in the tube body and having a valve port;
A needle member having a taper for controlling an opening area of the valve port, the needle member being arranged to be close to or away from the valve port of the valve seat;
The needle member is fixed between the opening end portion of the tube body and has a through-hole penetrating an end surface facing the opening end portion of the tube body, and the needle member is connected to the valve port of the valve seat. A biasing member support that supports one end of a biasing member that biases in a direction approaching
A restriction valve that has a bottom wall facing the through hole of the biasing member support portion and opens and closes an opening end of the through hole of the biasing member support portion,
The restriction valve is separated from the through hole of the biasing member support portion according to the pressure of the refrigerant acting on the bottom wall through the through hole of the biasing member support portion, and is on the one opening end side. While letting the refrigerant flow out, the bottom wall is brought into contact with the peripheral edge of the through hole of the biasing member support portion in accordance with the pressure of the refrigerant from one opening end portion of the tube main body that acts on the bottom wall. A diaphragm device characterized by that . The throttle device according to claim 1, wherein the biasing member support portion includes a return spring that biases the restriction valve in a direction away from the opening end of the through hole of the biasing member support portion . An evaporator, a compressor, and a condenser;
  A refrigeration cycle system, wherein the expansion device according to claim 1 or 2 is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.

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