JP6374215B2 - Throttle device, refrigeration cycle system including the same, and method of manufacturing the throttle device - Google Patents

Description

  The present invention relates to an expansion device, a refrigeration cycle system including the expansion device, and a method for manufacturing the expansion device.

  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 and 2, a differential pressure type throttle device reduces the pressure of the refrigerant 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.

  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 in contact with the valve portion of the first valve body. 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. 4897428

  In the differential pressure type throttle device as described above, many parts such as a plurality of stoppers and set screws are required, and the internal structure becomes complicated, which may increase the manufacturing cost. In such a case, for example, when the adjustment mechanism for adjusting the elastic force of the plurality of springs as described above is not provided in order to reduce the number of parts, in order to set the valve opening start pressure in the throttle flow path with high accuracy, However, since it is necessary to unnecessarily improve the finishing accuracy of individual parts, the manufacturing cost increases.

  In view of the above problems, the present invention is a throttling device, a refrigeration cycle system including the throttling device, and a throttling device manufacturing method, which can adjust a valve opening start pressure corresponding to each refrigerant, An object of the present invention is to provide a throttling device that can simplify the structure of the throttling device and reduce manufacturing costs, a refrigeration cycle system including the throttling device, and a method for manufacturing the throttling device.

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 An urging member supporting portion for supporting one end of an urging member that has a through hole and urges the needle member in a direction approaching the valve port of the valve seat; an urging member supporting portion; Is formed on the outer periphery of the tube body so as to adjust the length of the biasing member disposed between the tube member according to the target valve opening start pressure in the needle member , and is thinned along the central axis of the tube body In one direction And lengthened that it may be spring length adjusting unit, configured with a.

In the method of manufacturing a throttle device according to the present invention, a valve member having a valve port is fixed in a tube body having an opening end at both ends, and a needle member having a taper for controlling the opening area of the valve port is provided on the valve seat. An urging member is disposed between the needle member and one of the open ends of the tube body to urge the needle member in a direction close to the valve port of the valve seat. An urging member support portion, which is arranged with a first length and has a through hole and supports one end of the urging member, is fixed in the tube body, and is thinned and unidirectional along the central axis of the tube body By forming the spring length adjusting portion that can be extended to the outer peripheral portion of the tube body by plastic deformation, the second length different from the first length corresponding to the target valve opening start pressure in the needle member is attached. Adjust the length of the force member Including the Rukoto.

  In addition, the central axis of the tube main body is such that the spring length adjusting portion has a second length in which the length of the biasing member between the needle member and the biasing member support portion is larger than the first length. It may be formed by being stretched in one direction along. Furthermore, the central axis of the tube main body is such that the spring length adjusting portion is a second length in which the length of the biasing member between the needle member and the biasing member support portion is smaller than the first length. It may be formed by being compressed in the other direction along. In the spring length adjusting portion, a plurality of annular grooves may be formed individually or continuously at intervals along the central axis of the tube body.

  Furthermore, the aperture device according to the present invention is manufactured by any of the above-described aperture device manufacturing methods.

  The refrigeration cycle system according to the present invention includes an evaporator, a compressor, and a condenser, and the above-described throttling device is connected to a pipe disposed between the outlet of the condenser and the inlet of the evaporator. It is provided.

  According to the throttle device, the refrigeration cycle system including the throttle device, and the method of manufacturing the throttle device according to the present invention, the length of the biasing member disposed between the biasing member support and the needle member Since the spring length adjusting portion formed on the outer peripheral portion of the tube main body is adjusted so as to adjust according to the target valve opening start pressure in the valve, the valve opening start pressure can be adjusted according to each refrigerant, and the throttle device The structure can be simplified and the manufacturing cost can be reduced.

(A) And (B) is sectional drawing with which it uses for description of the process of 1st Example of the manufacturing method of the diaphragm | throttle device which concerns on this invention, respectively, and 1st Example of the diaphragm | throttle device concerning this invention. It is sectional drawing which shows a structure. It is sectional drawing which shows the structure of 1st Example of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is sectional drawing shown along the III-III line in FIG. (A) And (B) is sectional drawing with which it uses for description of the process of 1st Example of the manufacturing method of the aperture_diaphragm | restriction apparatus based on this invention, respectively. (A) and (B) are configuration diagrams schematically showing the configuration of the performance measurement / stretching device used in the first embodiment of the method of manufacturing a diaphragm device according to the present invention, respectively. It is a block diagram which shows schematically the structure of the crimping jig | tool of the extending | stretching apparatus shown by FIG. 5 (A) and (B). 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. It is a figure which is provided for operation | movement description of 1st Example of the manufacturing method of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is sectional drawing which shows the structure of 2nd Example of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is sectional drawing which shows the structure of 3rd Example of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is a block diagram which shows roughly the structure of the performance measurement / compression apparatus used for 3rd Example of the manufacturing method of the aperture_diaphragm | restriction apparatus which concerns on this invention. It is a figure with which it uses for operation | movement description of 3rd Example of the manufacturing method of the aperture_diaphragm | restriction apparatus which concerns on this invention.

  FIG. 2 shows the configuration of the first embodiment of the diaphragm apparatus according to the present invention.

  For example, as schematically shown in FIG. 6, the throttle 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. 6, 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.

  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, and a spring receiving portion 12 that supports one end of the coil spring 16 as main elements. ing.

  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 10CA2 of the tube main body 10 by caulking into the outer peripheral portion thereof. A spring length adjusting portion 10AJ is formed in a portion facing the valve seat 22 adjacent to the recess 10CA2 in the outer peripheral portion of the tube main body 10. As will be described later, the spring length adjusting portion 10AJ is formed by stretching the tube main body 10 in the direction of the central axis thereof by a caulking jig 30 (see FIG. 5C).

  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.

  The cylindrical needle member 20 having a flat surface facing in the cross section is made of, for example, brass or stainless steel. The portion has a protruding spring receiving portion 20D. As shown in FIG. 3, a flow path 10a is formed between the flat surface of the outer peripheral portion of the needle member 20 between the tapered portion 20P and the spring guide portion 20D 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.

  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 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, a tapered portion 12b of the spring receiving portion 12 as the urging member support portion is engaged with one end portion of the coil spring 16 as the urging member.

  The spring receiving portion 12 has a through hole 12a in the inner central portion. The spring receiving portion 12 is fixed by biting a protrusion formed by the depression 10CA1 of the tube body 10 by caulking. The spring constant of the coil spring 16 is set to a predetermined value.

  Adjustment of the urging force of the coil spring 16, that is, adjustment of the reference height (set length) of the coil spring 16 corresponding to each refrigerant is performed in the following procedure.

  The reference height refers to the height of the coil spring 16 set so as to be the above-described predetermined separation timing of the tapered portion 20P of the needle member 20 corresponding to each refrigerant.

  First, as shown in FIG. 4A, the valve seat 22 is fixed at a predetermined first position in the inner peripheral portion 18a of the tube body 18 having a predetermined overall length. The valve seat 22 is fixed by a protrusion formed by the depression 18CA2 of the tube main body 18 by caulking into the outer peripheral portion thereof. Next, the needle member 20 and the coil spring 16 are sequentially inserted into the inner peripheral portion 18 a of the tube main body 18 in the tube main body 18 to which the valve seat 22 is fixed, and then the spring receiving portion 12 of the tube main body 18. It is fixed at a predetermined position in the inner peripheral portion 18a. Thereby, as shown in FIG. 1 (A) and FIG. 4 (B), in the spring receiving portion 12, the protrusion formed by the depression 10′CA1 of the tube main body 10 ′ by caulking process bites into the outer peripheral portion. It is fixed by. At that time, the initial set length L ′ of the coil spring 16 (the first set length L ′) (the first set length L ′) is taken into consideration in consideration of manufacturing errors in the dimensions of the valve seat 22, the needle member 20, the spring receiving portion 12, and the coil spring 16. As for the length, the separation start timing (valve opening start pressure IP) at which the tapered portion 20P of the needle member 20 begins to separate from the peripheral edge of the opening end of the valve port 22a is always the target separation start timing (target valve opening). It is set so as to become slower (become larger) with respect to the initial pressure SP). By setting the coil spring 16 to the initial set length L ′ in this way, the outer peripheral portion of the tapered portion 20P of the needle member 20 is set to the peripheral edge of the opening end portion of the valve port 22a, and a predetermined valve pressure starting from the target pressure SP is reached. Is maintained in contact with the pressure.

  Subsequently, in a state in which the outer peripheral portion of the tapered portion 20P of the needle member 20 is in contact with the peripheral edge of the opening end portion of the valve port 22a, the tube main body 10 ′ can perform the performance measurement / measurement as shown in FIG. Arranged in a stretching device.

  The performance measuring / stretching device is connected to one end 10′E1 of the tube main body 10 ′ described above, and supplies an air from an air pump (not shown) into the tube main body 10 ′, and the tube main body 10 ′. A discharge passage 36 that is connected to the other end 10 ′ E 2 and discharges air from the tube main body 10 ′, and a float type flow meter 38 that is connected to the discharge passage 36 are configured. The introduction passage 32 is connected to the discharge side of the air pump. The introduction passage 32 is provided with a pressure gauge 34 that detects the pressure in the introduction passage 32. As shown in FIG. 5C, the caulking jig 30 in the performance measuring / stretching device is positioned at a position corresponding to the spring length adjusting portion 10AJ in the tube body 10 ′ described above. In that case, tube main body 10 'is supported by the support stand which illustration is abbreviate | omitted so that the whole may not move.

  The caulking jig 30 includes, for example, caulking rollers 30 </ b> A, 30 </ b> B, and 30 </ b> C that are arranged on the outer peripheral portion of the tube main body 10 ′ so as to be capable of rotating at three positions at regular intervals along the circumferential direction.

  The caulking rollers 30A, 30B, and 30C are arranged at portions corresponding to the spring length adjusting portion 10AJ of the tube main body 10 at the outer peripheral portion of the tube main body 10 'while rotating on the outer peripheral surface in the direction indicated by the arrow for a predetermined period. , And is configured to be pressed at a predetermined pressure. The predetermined period and the pressing force are set based on the period until the air flow rate corresponding to the target valve opening start pressure is detected by the flow meter 38.

  By the caulking rollers 30A, 30B, and 30C, the portion corresponding to the spring length adjusting portion 10AJ in the outer peripheral portion of the tube main body 10 ′ is thinned and is attached to the end along the central axis of the tube main body 10 ′ along with the valve seat 22. It will be stretched in the 10'E1 direction. As a result, the total length of the tube main body 10 ′ is slightly longer than the total length of the tube main body 18 in accordance with the amount of displacement of the portion corresponding to the spring length adjusting portion 10AJ of the tube main body 10 ′.

  Subsequently, when the caulking rollers 30A, 30B, and 30C are in an operating state, air set at the above-described target valve opening start pressure is supplied into the tube main body 10 'through the introduction passage 32. As described above, when the caulking rollers 30A, 30B, and 30C do not operate, the initial set length L ′ of the coil spring 16 is set so that the biasing force of the coil spring 16 is larger than the pressure at which the target valve starts opening in advance. Therefore, the state where the outer peripheral portion of the tapered portion 20P of the needle member 20 is in contact with the peripheral edge of the opening end portion of the valve port 22a is maintained. In the case of the initial set length L ′ of the coil spring 16, if an air pressure higher than the pressure IP is applied, the opening area of the throttle portion increases as the pressure rises and flows out from the other end 10E2 ( The flow rate (flowing into the secondary side pipe Du2) increases.

  In FIG. 7, the vertical axis represents the flow rate of air discharged from the other end 10′E2 of the tube body 10 ′ and introduced into the float type flow meter, and the horizontal axis is introduced into one end 10′E1 of the tube body 10 ′. Characteristic line La indicating the flow rate characteristic when the coil spring 16 is set to the initial set length L ′ and the characteristic indicating the flow rate characteristic when the coil spring 16 is set to the set length L Line Lb is shown.

  On the other hand, after the caulking rollers 30A, 30B, and 30C are actuated for a predetermined period, the total length of the tube main body 10 'increases with the valve seat 22, so that the length of the coil spring 16 is as shown in FIG. Furthermore, the set length L (second length) is longer than the initial set length L ′ (first length).

  The set length L (second length) of the coil spring 16 is set so as to apply an urging force corresponding to the above-described target valve opening start pressure. Therefore, since the biasing force of the coil spring 16 decreases and matches the biasing force according to the target valve opening start pressure, 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. The As a result, as shown in FIG. 5B, air is discharged through the valve port 22a of the valve seat 22, the through hole 12a of the spring receiving portion 12, and the other end 10E2, and then introduced into the float flow meter 38. Is done. When the air flow rate Qa corresponding to the target valve opening start pressure SP is detected by the float type flow meter 38, the rotation of the caulking rollers 30A, 30B, 30C is stopped. At that time, the valve seat 22 is fixed to the second position of the tube main body 10. Accordingly, the flow rate characteristic shifts from the characteristic line La in FIG. 7 to the characteristic line Lb.

  Then, the tube body 10 in which the spring length adjusting portion 10AJ is formed is removed from the caulking jig 30. Therefore, the adjustment of the spring length of the coil spring 16 is completed.

  In the above-described example, the caulking jig 30 is controlled based on the detection of the air flow rate according to the target valve opening start pressure. However, the present invention is not limited to such an example. The caulking jig 30 may be controlled by detecting, with a position sensor or the like, the timing of separation from the periphery of the opening end of the valve port 22a of the valve seat 22 of the detail 20P.

  Therefore, in the first embodiment described above, an adjustment screw or the like for adjusting the spring length of the coil spring 16 is not required, so that the valve opening pressure corresponding to each refrigerant can be adjusted, and the expansion device The structure can be simplified and the manufacturing cost can be reduced.

  FIG. 8 shows the configuration of a second embodiment of the diaphragm apparatus according to the present invention.

  In the first embodiment shown in FIGS. 1A and 1B, the spring length adjusting portion 10AJ is formed by caulking rollers 30A, 30B, and 30C having flat outer peripheral surfaces. In the second embodiment, the spring length adjusting portion 50AJ is formed by three caulking rollers having a plurality of minute protrusions on the outer peripheral surface. In FIG. 8, components that are the same in the example shown in FIGS. 1A and 1B are denoted by the same reference numerals, and redundant description thereof is omitted.

  The throttle device includes a tube body 50 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 body 50 and forms a flow rate adjusting unit that 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, and a spring receiving portion 12 that supports one end of the coil spring 16 as main elements. ing.

  The tube body 50 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 50E1 into which the refrigerant is introduced. The other end 50E2 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 50E1 in the inner peripheral portion of the tube main body 50 by a predetermined distance. The valve seat 22 is fixed by the protrusion formed by the depression 50CA2 of the tube main body 50 by caulking process biting into the outer peripheral portion thereof. A spring length adjusting portion 50AJ is formed in a portion of the outer peripheral portion of the tube main body 50 adjacent to the recess 50CA2 and facing the valve seat 22. After the set length L of the coil spring 16 is adjusted as will be described later, the spring length adjuster 50AJ has a plurality of annular grooves 50d along the circumferential direction at a predetermined interval along the central axis. Are formed individually. The groove 50d is not limited to such an example, and may be formed continuously in a spiral shape, for example.

  The spring length adjusting portion 50AJ is formed by subjecting the tube main body 50 to stretching in the direction of the central axis by a caulking jig (not shown).

  The adjustment of the urging force of the coil spring 16, that is, the adjustment of the reference height (set length) of the coil spring 16 according to each refrigerant, is first performed in the same manner as in the above-described example. The valve seat 22 is fixed at a predetermined first position in the section. Next, after the needle member 20 and the coil spring 16 are sequentially inserted into the inner peripheral portion 18a of the tube main body 18 in the tube main body to which the valve seat 22 is fixed, the spring receiving portion 12 is moved to the inner periphery of the tube main body. It is fixed at a predetermined position in the section. At that time, considering the manufacturing error of the dimensions of the valve seat 22, the needle member 20, the spring receiving portion 12, and the coil spring 16, the variation of the spring constant, and the like, the initial set length L ′ of the coil spring 16 is the needle member. The separation start timing (valve opening start pressure IP) at which the 20 tapered portions 20P start to separate from the peripheral edge of the opening end of the valve port 22a is always set to the target separation start timing (target valve opening start pressure SP). It is set to be slower (becomes larger). By setting the coil spring 16 to the initial set length L ′ in this way, the outer peripheral portion of the tapered portion 20P of the needle member 20 is set to the peripheral edge of the opening end portion of the valve port 22a, and a predetermined valve pressure starting from the target pressure SP is reached. Is maintained in contact with the pressure.

  Subsequently, the tube body is disposed in a performance measurement / stretching device (not shown) in a state where the outer peripheral portion of the tapered portion 20P of the needle member 20 is in contact with the peripheral edge of the opening end portion of the valve port 22a. The performance measuring / stretching device has the same configuration except for the caulking roller of the caulking jig in the example shown in FIG.

  When each caulking roller is in the activated state, the portion corresponding to the spring length adjusting portion 50AJ on the outer peripheral portion of the tube main body is thinned, and along the central axis of the tube main body along with the valve seat 22 in one end direction. It will be stretched. As a result, the total length of the tube main body is slightly longer than the total length of the initial tube main body according to the amount of displacement of the portion corresponding to the spring length adjusting portion 50AJ of the tube main body.

  Subsequently, when each caulking roller is in an operating state, air set at the above-described target valve opening start pressure is supplied into the tube body through the introduction passage 32. As described above, when the caulking roller does not operate, the initial set length L ′ of the coil spring 16 is set so that the biasing force of the coil spring 16 is larger than the target valve opening pressure in advance, so that the needle member The state where the outer peripheral portion of the 20 tapered portions 20P is in contact with the peripheral edge of the opening end portion of the valve port 22a is maintained.

  On the other hand, after the caulking roller is actuated for a predetermined period, the total length of the tube main body is increased along with the valve seat 22, so that the length of the coil spring 16 becomes a set length L longer than the initial set length L ′. FIG. 8 shows a state where the length of the coil spring 16 is the set length L.

  The set length L of the coil spring 16 is set so that an urging force corresponding to the above-described target valve opening start pressure is applied. Therefore, since the biasing force of the coil spring 16 decreases and matches the biasing force according to the target valve opening start pressure, 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. The As a result, as shown in FIG. 5B, air is discharged through the valve port 22a of the valve seat 22, the through hole 12a of the spring receiving portion 12, and the other end 50E2, and then introduced into the float flow meter 38. Is done. When the air flow rate Qa corresponding to the target valve opening start pressure SP is detected by the float type flow meter 38, the rotation of the caulking roller is stopped. At that time, the valve seat 22 is fixed to the second position of the tube main body 10. Therefore, the opening area of the throttle portion increases as the pressure increases.

  And the tube main body 50 in which the spring length adjustment part 50AJ was formed is removed from a caulking jig. Therefore, the adjustment of the spring length of the coil spring 16 is completed.

  Therefore, also in the second embodiment described above, an adjustment screw or the like for adjusting the spring length of the coil spring 16 is not required, so that the valve opening pressure corresponding to each refrigerant can be adjusted, and the throttle The structure of the apparatus can be simplified and the manufacturing cost can be reduced.

  FIG. 9 shows the configuration of a third embodiment of the diaphragm apparatus according to the present invention.

  In the first embodiment shown in FIGS. 1A and 1B, the spring length adjusting portion 10AJ is formed by caulking rollers 30A, 30B, and 30C having flat outer peripheral surfaces. For example, the spring length adjusting portion 40AJ in a bulge-formed pipe is formed in advance by a forming die 60 including a fixed forming die 62 and a movable forming die 64.

  9 and 10, the same constituent elements in the examples shown in FIGS. 1A and 1B and FIGS. 5A and 5B are denoted by the same reference numerals, Duplicate explanation is omitted.

  For example, the expansion device is disposed between the condenser and the evaporator in the piping of the refrigeration cycle system similar to the example shown in FIG.

  The throttle device includes a tube body 40 joined to the piping of the above-described refrigeration cycle system, a valve seat 24 that is fixed to the inner peripheral portion of the tube body 40 and forms a flow rate adjusting unit that 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 24, and a spring receiving portion 12 that supports one end of the coil spring 16 as main elements. ing.

  The tube body 40 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 40E1 into which the refrigerant is introduced. The other end 40E2 from which the refrigerant is discharged is joined to the secondary side pipe Du2 connected to the evaporator.

  An outer peripheral portion of the valve seat 24 is fixed to an intermediate portion that is separated from the one end 40E1 in the inner peripheral portion of the tube main body 40 by a predetermined distance. The valve seat 24 is fixed by the protrusion formed by the depression 40CA2 of the tube main body 40 by caulking process biting into the outer peripheral portion thereof.

  The cylindrical valve seat 24 has a valve port 24a into which a tapered portion 20P in a needle member 20 to be described later is inserted at an inner central portion. The valve port 24a has a predetermined diameter larger than the tip of the tapered portion 20P of the needle member 20, a small diameter portion extending toward the one end 40E1 along the central axis of the valve seat 24, and a funnel connected to the small diameter portion. It is comprised from the extended part of a shape.

  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 24a, there is a restriction between the tapered portion 20P of the needle member 20 and the opening end portion of the valve port 24a. Part is formed. The throttling portion refers to a location (narrowest portion) where the intersection of the perpendicular line from the edge of the valve port 24a to the bus bar of the tapered detail 20P and the bus line of the tapered detail 20P is closest to the edge 24as of the valve port 24a. The area of the conical surface drawn by the perpendicular is the opening area of the diaphragm.

  The spring receiving portion 12 has a through hole 12a in the inner central portion. The spring receiving portion 12 is fixed by biting a protrusion formed by the depression 40CA1 of the tube main body 40 by caulking. The spring constant of the coil spring 16 is set to a predetermined value.

  Between the recess 40CA2 in the outer peripheral portion of the tube main body 40 and the recess 40CA1 of the tube main body 40, a spring length adjustment portion 40AJ is formed in advance so as to project annularly in the radial direction of the tube main body 40 by, for example, bulge forming. . As will be described later, the spring length adjusting unit 40AJ is subjected to compression processing in the central axis direction with respect to the tube body by a forming die 60 (see FIG. 10) including a fixed forming die 62 and a movable forming die 64. Is formed.

  Adjustment of the urging force of the coil spring 16, that is, adjustment of the reference height (set length) of the coil spring 16 corresponding to each refrigerant is performed in the following procedure.

  The reference height refers to the height of the coil spring 16 set so as to be the above-described predetermined separation timing of the tapered portion 20P of the needle member 20 corresponding to each refrigerant.

  First, as shown in FIG. 10, the valve seat 24 is fixed in advance at a predetermined first position in the inner peripheral portion of the tube body having a spring length adjusting portion 40AJ formed at a predetermined position by, for example, bulge molding. The The valve seat 24 is fixed by a protrusion formed by a depression of the tube main body by caulking, biting into the outer peripheral portion thereof. Next, after the needle member 20 and the coil spring 16 are sequentially inserted into the inner peripheral portion of the tube main body in the tube main body to which the valve seat 24 is fixed, the spring receiving portion 12 is in the inner peripheral portion of the tube main body. It is fixed at a predetermined position. Thereby, the spring receiving part 12 is fixed when the protrusion formed by the hollow of the tube main body by caulking process bites into the outer peripheral part. At this time, considering the manufacturing error of the dimensions of the valve seat 24, the needle member 20, the spring receiving portion 12, and the coil spring 16, the variation of the spring constant, etc., the initial set length L ′ of the coil spring 16 is as shown in FIG. As shown in FIG. 5, the separation start timing (valve opening start pressure IP) at which the tapered portion 20P of the needle member 20 starts to separate from the peripheral edge of the opening end of the valve port 24a is always the target separation start timing (target valve The pressure is set to be faster (smaller) with respect to the opening pressure SP). Thus, by setting the coil spring 16 to the initial set length L ′, the outer peripheral portion of the tapered portion 20P of the needle member 20 is set to the peripheral edge of the opening end portion of the valve port 24a, and the target valve starts to open at a predetermined pressure less than the pressure SP. Is maintained in contact with the pressure.

  Subsequently, the tube body is disposed in the performance measurement / compression device as shown in FIG. 10 with the outer peripheral portion of the tapered portion 20P of the needle member 20 in contact with the peripheral edge of the open end of the valve port 24a. The

  The performance measuring / compressing device is connected to one end of the above-mentioned tube main body and is connected to one end of the tube main body, and an introduction passage 32 for supplying air from the air pump into the tube main body, which is not shown. A discharge passage 36 for discharging air and a float type flow meter 38 connected to the discharge passage 36 are included. As shown in FIG. 10, the fixed mold 62 and the movable mold 64 of the mold 60 in the performance measurement / compression apparatus are positioned at positions sandwiching the spring length adjusting portion 40AJ in the tube body described above. In that case, the tube main body is supported by the support stand which abbreviate | omits illustration so that the whole may not move.

The movable mold 64 is driven so as to be close to the fixed mold 62 so as to compress the spring length adjusting section 40AJ or to be separated so as to release the spring length adjusting section 40AJ.
The above-described compression force is set based on the period until the air flow rate corresponding to the target valve opening start pressure is detected by the flow meter 38.

  By the fixed mold 62 and the movable mold 64, the portion corresponding to the spring length adjusting portion 40AJ in the outer peripheral portion of the tube body is compressed, and the direction of the other end along the central axis of the tube body with the valve seat 24 is compressed. Will be reduced. As a result, the total length of the tube main body is slightly shorter than the total length of the initial tube main body according to the amount of displacement of the portion corresponding to the spring length adjusting portion 40AJ.

  Subsequently, when the mold 60 is in an operating state, air set by the above-described target valve opening start pressure is supplied into the tube body through the introduction passage 32. As described above, when the mold 60 does not operate, the initial set length L ′ of the coil spring 16 is set so that the biasing force of the coil spring 16 is smaller than the pressure at which the target valve starts to open in advance. The state where the outer peripheral portion of the tapered portion 20P of the member 20 is separated from the peripheral edge of the opening end portion of the valve port 24a is maintained, and air flows out from the tube body. In the case of the initial set length L ′ of the coil spring 16, if an air pressure higher than the pressure IP is applied, the opening area of the throttle portion increases as the pressure rises and flows out from the other end 40E2 ( The flow rate (flowing into the secondary side pipe Du2) increases.

  In FIG. 11, the vertical axis represents the flow rate of air discharged from the other end of the tube body and introduced into the float type flow meter, the horizontal axis represents the pressure of air introduced into one end of the tube body, and the coil spring A characteristic line Lc indicating the flow rate characteristic when 16 is set to the initial set length L ′ and a characteristic line Lb indicating the flow rate characteristic when the coil spring 16 is set to the set length L are shown.

  On the other hand, after the molding die 60 is operated for a predetermined period, the total length of the tube main body is reduced with the valve seat 24, so that the length of the coil spring 16 is the initial set length L as shown in FIG. The set length L is shorter than '.

  The set length L of the coil spring 16 is set so that an urging force corresponding to the above-described target valve opening start pressure is applied. Accordingly, the biasing force of the coil spring 16 increases and matches the biasing force according to the target valve opening start pressure, so that the outer peripheral portion of the tapered portion 20P of the needle member 20 is brought close to the peripheral edge of the opening end portion of the valve port 24a. The Thus, the air is discharged through the valve port 24a of the valve seat 24, the through hole 12a of the spring receiving portion 12, and the other end 40E2, and then introduced into the float type flow meter 38. When the air flow rate Qb corresponding to the target valve opening start pressure SP is detected by the float flow meter 38, the movable mold 64 of the mold 60 is stopped. At that time, the valve seat 24 is fixed to the second position of the tube main body 40. Accordingly, the flow rate characteristic shifts from the characteristic line Lc in FIG. 11 to the characteristic line Lb.

  And the tube main body 40 in which the spring length adjustment part 40AJ was formed is removed from the shaping | molding die 60. FIG. Therefore, the adjustment of the spring length of the coil spring 16 is completed.

  In the above-described example, the mold 60 is controlled based on the detection of the air flow rate according to the target valve opening start pressure. However, the present invention is not limited to this example. The molding die 60 may be controlled by detecting the timing of separation from the peripheral edge of the opening end of the valve port 24a of the 20P valve seat 24 with a position sensor or the like.

  Accordingly, also in the third embodiment described above, an adjustment screw or the like for adjusting the spring length of the coil spring 16 is not required, so that the valve opening pressure corresponding to each refrigerant can be adjusted, and the throttle The structure of the apparatus can be simplified and the manufacturing cost can be reduced.

10, 40, 50 Tube body 10AJ, 40AJ, 50AJ Spring length adjusting portion 12 Spring receiving portion 16 Coil spring 20 Needle members 22, 24 Valve seat

Claims (8)

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;
One end of a biasing member that is disposed between the needle member and one open end of the tube main body and that has a through hole and biases the needle member in a direction approaching the valve port of the valve seat. A biasing member support to support;
Formed on the outer periphery of the tube main body so as to adjust the length of the biasing member disposed between the biasing member support and the needle member according to the target valve opening start pressure in the needle member A spring length adjusting portion that is thinned and can be extended in one direction along the central axis of the tube body ;
A diaphragm device comprising: A valve seat having a valve port is fixed in a tube body having an open end at both ends, and a needle member having a taper for controlling the opening area of the valve port can be close to or separated from the valve port of the valve seat. Placed in
An urging member for urging the needle member in a direction approaching the valve port of the valve seat is disposed at a first length between the needle member and one open end of the tube body, A biasing member supporting portion that has a through hole and supports one end of the biasing member is fixed in the tube main body, is thinned, and can be extended in one direction along the central axis of the tube main body By forming the adjustment portion by plastic deformation of the outer peripheral portion of the tube body, the biasing member has a second length different from the first length according to the target valve opening start pressure in the needle member. A method of manufacturing a diaphragm device including adjusting a length.   The spring length adjusting portion is configured so that the length of the biasing member between the needle member and the biasing member support portion is the second length that is greater than the first length. 3. The method of manufacturing a diaphragm device according to claim 2, wherein the diaphragm device is formed by being stretched in one direction along the central axis of the tube body.   The spring length adjusting portion is configured such that the length of the biasing member between the needle member and the biasing member support portion is the second length that is smaller than the first length. 3. The method of manufacturing a diaphragm device according to claim 2, wherein the diaphragm device is formed by being compressed in the other direction along the central axis of the tube body.   3. The expansion device according to claim 2, wherein the spring length adjusting portion is formed with a plurality of annular grooves individually or continuously at intervals along a central axis of the tube body. Production method.   A diaphragm device manufactured by the method of manufacturing a diaphragm device according to any one of claims 2 to 5. An evaporator, a compressor, and a condenser;
2. The refrigeration cycle system, wherein the expansion device according to claim 1 is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator. An evaporator, a compressor, and a condenser;
The refrigeration cycle system, wherein the expansion device according to claim 6 is provided in a pipe arranged between the outlet of the condenser and the inlet of the evaporator.

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