CN110582678A - Throttling device and refrigeration cycle system - Google Patents
Throttling device and refrigeration cycle system Download PDFInfo
- Publication number
- CN110582678A CN110582678A CN201880029612.XA CN201880029612A CN110582678A CN 110582678 A CN110582678 A CN 110582678A CN 201880029612 A CN201880029612 A CN 201880029612A CN 110582678 A CN110582678 A CN 110582678A
- Authority
- CN
- China
- Prior art keywords
- guide
- stopper member
- hole
- main body
- hollow portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
Abstract
The stopper member (12) is formed by press working with a copper alloy thin plate material, for example, to have a uniform thickness, and has a through hole (12H) that constitutes a part of the internal pressure release mechanism so as to face the outer peripheral surface of the guide portion (18B), and when the pressure in the hollow portion (14) of the stopper member (12) rises sharply to a predetermined value or more, the trunk portion (midriff portion) of the stopper member (12) swells, and thereby the liquid refrigerant in the hollow portion (14) is easily discharged into the inner peripheral portion (10a) of the tube main body (10) through the through hole (12H) that is in an open state.
Description
Technical Field
The present invention relates to a throttle device and a refrigeration cycle system.
Background
The differential pressure type expansion device optimally controls the pressure of the refrigerant between the condenser outlet and the evaporator inlet in order to efficiently operate the compressor in accordance with the outside air temperature, and also optimally controls the pressure of the refrigerant in accordance with the rotational speed of the compressor from the viewpoint of labor saving even in a refrigeration cycle system in which the rotational speed of the compressor can be changed. In such an expansion device, for example, one end into which the refrigerant is introduced is joined to a primary-side pipe connected to the condenser, and the other end from which the refrigerant flows out is joined to a secondary-side pipe connected to the evaporator.
For example, as shown in patent document 1, a differential pressure type throttle device is configured to include the following components as main elements: a main body housing connected to the primary side piping and the secondary side piping, respectively; a valve seat part and a guide part which are fixed in the main body shell and are formed integrally; a needle valve inserted into a valve port formed in the valve seat portion; and a coil spring for urging the needle valve in a direction approaching the valve port. In the throttle device, a cylindrical stopper portion surrounding the slide shaft of the needle valve, the coil spring, and the spring holder is provided in the guide portion. This prevents foreign matter from adhering to the biasing mechanism such as the coil spring, and thus stable operability can be obtained. Further, the vibration of the spring member due to the flow of the refrigerant is reduced, and the generation of noise can be prevented.
the stopper portion has a stopper chamber (hereinafter, also referred to as a hollow portion) inside which a liquid refrigerant is accumulated. The stopper chamber communicates with the inner peripheral portion of the body case through a pressure equalizing hole (see fig. 1) provided in a side surface of the stopper portion or a gap (see fig. 4) between a caulking portion in the stopper portion and the outer peripheral portion of the guide portion. Accordingly, when the pressure in the primary chamber of the main body housing connected to the primary-side pipe changes, the pressure in the stopper chamber also changes in a follow-up manner.
In the refrigeration cycle, for example, as shown in patent document 2, a hot-gas defrosting operation may be performed. When the hot-gas defrosting operation is performed, for example, a high-temperature high-pressure gas refrigerant discharged from the compressor is introduced between the evaporator and the condenser.
Documents of the prior art
Patent document
patent document 1: japanese patent laid-open publication No. 2017-48986
Patent document 2: japanese laid-open patent publication No. 5-71830
Disclosure of Invention
In the case where the stopper portion in the throttle device shown in patent document 1 has the pressure equalizing hole, foreign matter having a diameter smaller than that of the pressure equalizing hole enters the stopper chamber through the pressure equalizing hole and adheres to the sliding shaft of the needle valve, and thus the slidability of the sliding shaft may be impaired. Further, foreign matter may be caught between the lower end surface (contact portion) of the needle valve and the inner surface of the stopper chamber of the opposing stopper portion, and the purge flow rate may be changed. As a countermeasure for this, it is also conceivable to set the diameter of the pressure equalizing hole of the stopper portion as small as possible.
However, in the refrigeration cycle, when the hot-gas defrosting operation is performed, when the temperature of the surroundings near the expansion device provided between the condenser and the evaporator rises sharply, the liquid refrigerant in the stopper chamber may expand sharply as the inside of the stopper chamber approaches the sealed space. In this case, since the diameter of the pressure equalizing hole of the stopper portion is set to be as small as possible as described above, there is a possibility that a trouble may occur in the throttle device, and therefore it cannot be said that setting the diameter of the pressure equalizing hole to be as small as possible is preferable.
in view of the above problems, an object of the present invention is to provide a flow device and a refrigeration cycle system in which, in a case where a liquid refrigerant in a stopper chamber (hollow portion) of a stopper portion is rapidly expanded due to any cause, foreign matter can be prevented from entering the stopper chamber (hollow portion) without causing a problem in the flow device.
in order to achieve the above object, a throttle device according to the present invention includes: a tube main body which is disposed in a pipe for supplying a refrigerant and has, at both ends thereof, open end portions communicating with the inside of the pipe; a valve seat disposed on an inner peripheral portion of the tube main body and having a valve port; a needle-like member having a tapered portion that is arranged so as to be able to approach or separate from and control an opening area of the valve port with respect to the valve port of the valve seat, and a guide shaft portion that is connected to a tip end of the tapered portion and extends away from the valve port toward an upstream side of refrigerant flow; a guide portion disposed on the upstream side of the inner peripheral portion of the tube main body with respect to the position of the valve seat in the refrigerant flow, the guide portion having a guide shaft portion of the needle member slidably disposed thereon; a biasing member disposed between the guide portion and one of the open end portions of the tube main body, and biasing the needle member in a direction approaching the valve port of the valve seat; a stopper member which is provided at an end of the guide portion so as to surround the guide shaft portion of the needle member and the biasing member, has a hollow portion into which the refrigerant enters, and is elastically displaceable; and an internal pressure release mechanism that releases the internal pressure in the hollow portion of the stopper member toward the inner peripheral portion of the tube main body when the pressure in the hollow portion becomes equal to or greater than a predetermined value.
Preferably, the internal pressure release mechanism is formed by an outer peripheral surface of the guide portion and a through hole formed in the stopper member so as to face the outer peripheral surface of the guide portion, and when the pressure in the hollow portion of the stopper member becomes a predetermined value or more, a peripheral edge of the through hole of the stopper member is separated from the outer peripheral surface of the guide portion, and the through hole and the hollow portion communicate with each other. Preferably, the internal pressure releasing mechanism includes a communication path provided in the guide portion and allowing the hollow portion of the stopper member to communicate with the outer peripheral surface of the guide portion, and a tongue-shaped piece that opens and closes an open end of the communication path that opens to the outer peripheral surface of the guide portion, and opens the open end of the communication path when the pressure in the hollow portion of the stopper member is equal to or higher than a predetermined value. Preferably, the internal pressure release mechanism is formed of a through hole formed in the body portion of the stopper member and a tongue piece for opening and closing the through hole, and the tongue piece opens the through hole when the pressure in the hollow portion of the stopper member is equal to or higher than a predetermined value.
The refrigeration cycle system of the present invention is characterized by comprising an evaporator, a compressor, and a condenser, wherein the above-described throttling device is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.
According to the throttle device and the refrigeration cycle system of the present invention, the internal pressure release mechanism releases the internal pressure in the hollow portion of the stopper member toward the inner peripheral portion of the tube main body when the pressure in the hollow portion becomes equal to or higher than the predetermined value, so that the throttle device is not put in a bad condition and foreign matter can be prevented from entering the hollow portion even when the liquid refrigerant in the hollow portion of the stopper portion is rapidly expanded due to any cause.
Drawings
Fig. 1 is a sectional view showing a configuration of an example of an orifice device of the present invention.
Fig. 2 is a sectional view showing an example of a needle assembly used in the throttle apparatus shown in fig. 1.
fig. 3 is a diagram schematically showing an example of a refrigeration cycle to which an example of the throttling device of the present invention is applied.
Fig. 4 is a characteristic diagram showing characteristics of the valve opening degree for explaining the operation of the example shown in fig. 1.
Fig. 5 is a sectional view for explaining an operation of an example of the needle assembly used in the throttle apparatus shown in fig. 1.
Fig. 6A is a cross-sectional view showing another example of the needle assembly used in the throttle apparatus shown in fig. 1.
Fig. 6B is a view from the arrow VIB of fig. 6A looking up in an enlarged manner.
Fig. 7 is a sectional view showing another example of the needle assembly used in the throttle apparatus shown in fig. 1.
Fig. 8 is a sectional view showing another example of the needle assembly used in the throttle apparatus shown in fig. 1.
Detailed Description
Fig. 1 shows a configuration of an example of an expansion device according to the present invention.
for example, as shown in fig. 3, the throttle device is disposed between the outlet of the condenser 6 and the inlet of the evaporator 2 in the pipe of the refrigeration cycle. The expansion device is joined to a primary side pipe Du1 at one end 10E1 of the tube main body 10 described later, and is joined to a secondary side pipe Du2 at the other end 10E2 of the tube main body 10 from which the refrigerant flows out. The primary pipe Du1 connects the outlet of the condenser 6 to the throttle device, and the secondary pipe Du2 connects the inlet of the evaporator 2 to the throttle device. The compressor 4 is connected between the outlet of the evaporator 2 and the inlet of the condenser 6 via a pipe Du3 connected to the outlet of the evaporator 2 and a pipe Du4 connected to the inlet of the condenser 6. The compressor 4 is driven and controlled by a control unit, not shown. Thereby, the refrigerant in the refrigeration cycle circulates, for example, along arrows shown in fig. 3.
In fig. 1, the throttle device is configured to include the following components as main elements: a tube main body 10 joined to the pipe of the refrigeration cycle; a guide tube 18 fixed to the inner peripheral portion 10a of the tube main body 10; a valve seat 18V and a needle member 20 integrally formed in the guide tube 18 and constituting a refrigerant flow rate adjusting portion for adjusting the flow rate of the refrigerant; a coil spring 16 for biasing the needle member 20 in a direction approaching the valve seat 18V; a spring support member 22 that supports one end of the coil spring 16; and a cylindrical stopper member 12 for receiving one end of the needle member 20.
An outer peripheral portion of a fixing portion 18A of the guide tube 18 having an outer diameter smaller than an inner diameter of the tube main body 10 is fixed to an intermediate portion of the inner peripheral portion 10a of the tube main body 10, which is apart from the one end 10E2 by a predetermined distance.
The guide tube 18 is made of a material such as copper, brass, or aluminum, or stainless steel by machining. The guide tube 18 includes a fixing portion 18A fixed to the inner peripheral portion 10a of the tube main body 10, and a guide portion 18B slidably guiding a guide shaft 20P2 of the needle member 20 described later.
The guide tube 18 is fixed by the projections formed by the recesses 10CA1 and 10CA2 of the tube body 10 by caulking into the grooves 18CA1 and 18CA2 in the outer peripheral portion of the fixing portion 18A. The guide tube 18 has a metal stopper member 12 on the outer periphery of the end of the guide portion 18B closest to the one end 10E1 of the tube main body 10.
The stopper member 12 is formed with a uniform thickness by press working using a copper alloy thin plate material, for example. By forming the stopper member 12 by press molding, it is possible to avoid a problem due to the volume expansion of the refrigerant at a relatively low cost. The copper alloy thin plate material has a thickness of, for example, 3% or more and 10% or less, preferably 0.3mm or more and 0.9mm or less, of the inner diameter of the stopper member 12. By making the wall thickness of the side surface of the stopper member 3 to 10% of the inner diameter of the stopper member 12, the stopper member 12 is easily deformed in the radial direction by the liquid refrigerant that expands, and the stopper member 12 is not deformed by liquid impact or application of an undesirable external force.
As shown enlarged in fig. 2, one end of the stopper member 12 is fixed to the guide portion 18B by a projection formed by a recess 12CA1 of the stopper member 12 by caulking into the groove 18CB1 at the end of the guide portion 18B. The depressed portions 12CA1 formed by the caulking process are formed at a plurality of, for example, three, locations with a predetermined interval in the circumferential direction of the stopper member 12. The cylindrical stopper member 12 has a closed end portion at the other end and is configured to cover the coil spring 16 and the spring holder member 22. The stopper member 12 extends from the guide portion 18B toward the one end 10E1 side of the tube main body 10. In addition, the closed end has a flat inner surface. The inner surface of the closed end is adapted to receive the end face 20P5 of the adjustment screw 20P 4. The adjustment screw 20P4 is integrally formed at one end of a guide shaft 20P2 of the needle member 20 described later, and is screwed into a female screw 22A at one end of the spring bearing member 22. Inside the stopper member 12, a hollow portion 14 into which a liquid refrigerant enters is formed.
A predetermined gap is formed between the inner peripheral surface of the stopper member 12 except the recessed portion 12CA1 and the outer peripheral surface of the guide portion 18B except the groove 18CB1 at the end portion thereof. Therefore, the refrigerant supplied from the one end 10E1 side of the tube main body 10 along the arrow shown in fig. 1 flows into the hollow portion 14 of the stopper member 12 through the gap and the gap between the guide portion 18B and the guide shaft 20P 2.
Further, a through hole 12H constituting a part of the internal pressure release mechanism is formed in the stopper member 12 at a position distant from the recessed portion 12CA1 toward the closed end by a predetermined distance so as to face the outer peripheral surface of the guide portion 18B. The diameter of the through hole 12H is set to a size equal to or larger than the thickness of the stopper member 12, for example. In fig. 2, the peripheral edge of the through hole 12H abuts against the outer peripheral surface of the guide portion 18B, whereby the through hole 12H is closed. On the other hand, as shown in fig. 5, when the pressure in the hollow portion 14 rapidly increases to a predetermined value or more, the trunk portion (middle abdominal portion) of the stopper member 12 swells, and thereby the peripheral edge of the through hole 12H is separated from the outer peripheral surface of the guide portion 18B, and a gap is formed therebetween.
Therefore, the liquid refrigerant in the hollow portion 14 is discharged into the inner peripheral portion 10a of the tube main body 10 through the through hole 12H in the open state in the direction indicated by the arrow LQ, that is, in the substantially radial direction of the body portion (middle abdominal portion) of the stopper member 12. Further, since the through hole 12H is provided in the side surface of the stopper member 12, the liquid refrigerant after the volume expansion flows into the pipe through the through hole 12H, and therefore, a valve is not necessary. Thus, the internal pressure release mechanism is formed by the through hole 12H of the stopper member 12 and the outer peripheral surface of the guide portion 18B. The number of through holes 12H is not limited to this example, and a plurality of through holes may be formed.
A guide portion 18B is formed on an upstream side portion of the guide pipe 18 with respect to a communication hole 18C described later. The guide shaft 20P2 of the needle member 20 is slidably fitted into the hole 18B of the guide 18B.
The valve port 18P and the hole 18b of the valve seat 18V of the fixed portion 18A of the guide pipe 18 are formed on a common central axis. At this time, since the guide portion 18B and the fixing portion 18A of the guide pipe 18 are integrally formed, the valve port 18P and the hole portion 18B of the valve seat 18V are easily machined with high accuracy on a common central axis so that their centers coincide with each other.
between the valve seat 18V of the fixing portion 18A and the guide portion 18B, a communication hole 18C is formed directly below the valve seat 18V. The communication hole 18C penetrating the guide pipe 18 in the radial direction communicates the valve port 18P between the outer peripheral portion of the guide pipe 18 and the inner peripheral portion 10a of the pipe main body 10.
The valve seat 18V of the guide tube 18 has a valve port 18P at the inner center portion, and the tapered portion 20P1 of the needle member 20 is inserted into the valve port 18P. The valve port 18P has a circular opening penetrating along the center axis of the valve seat 18V with a predetermined uniform diameter. The valve port 18P is not limited to this example, and may be formed to pass through the valve seat 18V along the center axis thereof so as to gradually open toward the one end 10E 1.
As shown in fig. 2, an involute portion 18d having an inner diameter gradually larger toward the downstream side than the diameter of the valve port 18P is formed inside the fixed portion 18A in a portion of the guide pipe 18 downstream of the valve seat 18V. The involute portion 18d is continuous with an inner peripheral portion 18e of the cylindrical fixed portion 18A.
As shown in fig. 2, the needle member 20 is formed by machining using a material such as brass or stainless steel, and mainly includes: a tapered portion 20P1 formed facing the valve seat 18V; a guide shaft portion 20P2 slidably fitted in the hole 18B of the guide portion 18B; a protruding portion 20F and a connecting projection piece 20F connected to the base of the tapered portion 20P 1; a spring bearing member coupling portion 20P3 formed at the tip of the guide shaft portion 20P 2; and an adjustment screw 20P 4.
the smallest diameter portion of the truncated cone-shaped tapered portion 20P1 having a predetermined taper angle is set to be slightly smaller than the diameter of the guide shaft portion 20P 2. The tapered portion 20P1 has a base portion having a diameter larger than the diameter of the valve port 18P, that is, a coupling portion to be coupled to an extension 20F described later, at a position distant from the valve port 18P by a predetermined distance when the end surface 20P5 of the adjusting screw 20P4 of the needle member 20 abuts against the inner surface of the closed end of the stopper member 12.
The spring holder member 22 is fixed to the spring holder member coupling portion 20P3 of the needle member 20 by caulking. The spring bearing member coupling portion 20P3 is formed of, for example, an annular groove. The spring bearing member 22 is fixed by the protrusion formed by the recess 22CA1 of the spring bearing member 22 by caulking into the groove of the spring bearing member coupling portion 20P 3. One end of the coil spring 16 is supported by a spring support portion 22F of the spring support member 22 facing the guide portion 18B. The spring support portion 22F protruding laterally is integrally formed at a position distant from the recessed portion 22CA1 by a predetermined distance in a direction approaching the guide portion 18B. The other end of the coil spring 16 is supported by the spring receiving portion 18f of the guide portion 18B. An end surface 18G of the abutting portion of the guide portion 18B that is continuous with the spring bearing portion 18F is separated from an end portion 22G of the cylindrical portion of the spring bearing portion 22F of the spring bearing member 22 by a predetermined distance. The coil spring 16 is wound around the cylindrical portion of the spring support portion 22F of the spring support member 22. Thus, even when the needle member 20 moves toward the other end 10E2 by a predetermined value or more, the end surface 18G of the contact portion of the guide portion 18B contacts the end portion 22G of the cylindrical portion of the spring support portion 22F, and the movement of the needle member 20 is restricted. Therefore, the coil spring 16 can be prevented from being excessively compressed above the predetermined value.
The male screw of the adjustment screw 20P4 integrally formed with the spring holder member coupling portion 20P3 of the needle member 20 is screwed into the hole of the female screw 22A of the inner peripheral portion of the spring holder member 22. The hole of the female screw 22A extends from the recessed portion 22CA1 in a direction away from the guide portion 18B. The adjustment screw 20P4 adjusts the force of the coil spring 16.
In the expansion device, the outer peripheral portion of the tapered portion 20P1 of the needle member 20 is set at the separation start time of the peripheral edge of the opening end portion that further starts to separate from the valve port 18P based on the biasing force of the coil spring 16, based on the differential pressure (the difference between the inlet pressure of the refrigerant on the one end 10E1 side and the outlet pressure of the refrigerant on the other end 10E2 side). The spring constant of the coil spring 16 is set to a predetermined value.
After the biasing force of the coil spring 16 is adjusted by the adjustment screw 20P4, the position of the adjustment screw 20P4 with respect to the spring bearing member 22 is fixed by the protrusion formed by the recess 22CA1 of the spring bearing member 22 by caulking engaging the groove of the spring bearing member coupling portion 20P 3.
when the end surface 20P5 of the adjustment screw 20P4 abuts against the flat inner surface of the closed end of the stopper member 12, the outer peripheral portion of the tapered portion 20P1 is disposed so as to form a predetermined gap with respect to the peripheral edge of the opening end of the valve port 18P at a position corresponding to the opening end of the valve port 18P in the outer peripheral portion of the tapered portion 20P1 of the needle member 20. At this time, a throttle portion is formed between the tapered portion 20P1 of the needle member 20 and the opening end portion of the valve port 18P. The throttle portion is a portion (narrowest portion) closest to the edge of the valve port 18P at the intersection of the generatrix of the tapered portion 20P1 and the perpendicular line from the peripheral edge of the valve port 18P to the tapered portion 20P 1. The area of the conical surface described by the perpendicular line becomes the opening area of the throttle portion.
When the pressure of the refrigerant in the tube main body 10 is equal to or less than the predetermined value, the end surface 20P5 of the adjusting screw 20P4 abuts against the inner surface of the closed end of the stopper member 12 at a predetermined pressure corresponding to the difference between the biasing force of the coil spring 16 and the pressure of the refrigerant from the primary-side pipe Du 1.
The predetermined amount of bleed through the throttle portion is set according to the amount of clearance formed with respect to the peripheral edge of the opening end of the valve port 18P. Further, since the end surface 20P5 of the adjusting screw 20P4 in the spring holder member 22 of the needle member 20 abuts against the inner surface of the closed end of the stopper member 12, the tapered portion 20P1 of the needle member 20 can be prevented from biting into the open end of the valve port 18P of the valve seat 18V due to the biasing force of the coil spring 16 and undesirable pressure from the secondary side acting on the needle member 20.
The needle assembly is formed by the guide tube 18, the needle member 20 inserted into the valve port 18P and the hole 18B of the guide tube 18, the spring holder member 22 into which the adjustment screw 20P4 of the needle member 20 is screwed by a predetermined amount, and the coil spring 16 disposed between the spring holder member 22 and the end of the guide portion 18B of the guide tube 18.
In this configuration, when the force acting on the needle member 20 due to the pressure of the refrigerant does not exceed the biasing force of the coil spring 16, as described above, when the refrigerant is supplied through the primary-side pipe Du1, the pressure of the refrigerant is reduced by passing through the one end 10E1 of the tube main body 10, the space between the inner peripheral portion 10a of the tube main body 10 and the outer peripheral portion of the stopper member 12, the communication passage 18C, and the aforementioned expansion portion, and then the refrigerant passes through the inner peripheral portion 18E of the fixing portion 18A of the guide tube 18 and is discharged from the other end 10E2 with a predetermined relief amount.
when the force acting on the needle member 20 due to the pressure of the refrigerant exceeds the biasing force of the coil spring 16, the refrigerant flowing through the throttle portion presses the needle member 20 in a direction further away from the peripheral edge of the valve port 18P. Thus, as shown in fig. 4, when the differential pressure P is a value P1, the differential pressure P increases from the differential pressure P1 with the valve opening (opening area of the throttle portion) VP being a predetermined value V1, and the valve opening VP linearly increases according to the characteristic line La. When the differential pressure P increases to a predetermined value P2, the valve opening VP reaches a predetermined value V2 that is a rated valve opening.
Further, even when the temperature of the expansion device rises due to some cause, for example, a hot gas defrosting operation or the like, and the pressure of the liquid refrigerant in the hollow portion 14 of the stopper member 12 rises sharply to a predetermined value or more, as shown in fig. 5, the body portion (middle abdominal portion) of the stopper member 12 swells, and the liquid refrigerant in the hollow portion 14 is easily discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, that is, in the radial direction of the stopper member 12 through the through hole 12H which is opened. Therefore, foreign matter does not enter the hollow portion 14 from the outside, and a trouble does not occur in the throttle device. By providing the through hole 12H in the stopper member 12 facing the fitting portion of the guide portion 18B, it is possible to suppress a pressure increase in the stopper member 12 and prevent foreign matter in the fluid from flowing into the stopper member 12 during normal operation. Therefore, workability is not impaired by foreign matter. Further, after the liquid refrigerant is discharged by the elastic deformation of the stopper member 12, the stopper member 12 returns to the initial shape state shown in fig. 2, and therefore there is no change in performance such as a change in the purge flow rate or a valve opening setting value.
fig. 6A is an enlarged view of the structure of another example of the needle unit used in an example of the throttle device of the present invention. In fig. 6A, the same components as those of the example shown in fig. 1 are denoted by the same reference numerals, and redundant description thereof is omitted.
The needle assembly is configured to include: a guide tube 28; a needle member 20 inserted into the valve port 28P and the hole 28b of the guide pipe 28; a spring support member 22 into which the adjustment screw 20P4 of the needle member 20 is screwed by a predetermined amount, and a coil spring 16 disposed between the spring support member 22 and an end of the guide portion 28B of the guide tube 28.
The guide tube 28 is made of a material such as copper, brass, or aluminum, or stainless steel by machining. The guide tube 28 includes a fixing portion 28A fixed to the inner peripheral portion 10a of the tube main body 10 shown in fig. 1, and a guide portion 28B configured to slidably guide the guide shaft 20P2 of the needle member 20.
The guide tube 28 is fixed by the grooves 28CA1 and 28CA2 which bite into the outer peripheral portion of the fixing portion 28A by projections formed by the recesses 10CA1 and 10CA2 of the tube main body 10 by caulking. The guide tube 28 has a metal stopper member 32 on the outer periphery of the end of the guide portion 28B closest to the one end 10E1 of the tube main body 10. The cylindrical stopper member 32 is formed by press working with a copper alloy thin plate material to have a uniform thickness. The copper alloy thin plate material has a thickness of, for example, 3% or more and 10% or less, preferably 0.3mm or more and 0.9mm or less, of the inner diameter of the stopper member 32.
One end of the stopper member 32 is fixed to the guide portion 28B by a protrusion formed by a recess 32CA1 of the stopper member 32 by caulking, which is caught in a groove 28CB1 at the end of the guide portion 28B. The dimples 32CA1 formed by the caulking process are formed at a plurality of, for example, three locations with a predetermined interval in the circumferential direction of the stopper member 32. The stopper member 32 has a closed end portion at the other end, and is configured to cover the coil spring 16 and the spring holder member 22.
The stopper member 32 extends from the guide portion 28B toward the one end 10E1 side of the tube main body 10. In addition, the closed end has a flat inner surface. The inner surface of the closed end is adapted to receive the end face 20P5 of the adjustment screw 20P 4. Inside the stopper 32, a hollow portion 24 into which the liquid refrigerant enters is formed.
A predetermined gap is formed between the inner peripheral surface of the stopper member 32 except the recess 32CA1 and the outer peripheral surface of the guide 28B except the groove 28CB1 at the end thereof. Therefore, the refrigerant supplied from the one end 10E1 side of the tube main body 10 flows into the hollow portion 24 of the stopper member 32 through the gap and the gap between the guide portion 28B and the guide shaft 20P 2.
As partially enlarged in fig. 6B, a tongue piece 32V constituting a part of the internal pressure release mechanism is formed so as to be elastically displaceable at a position distant from the recess 32CA1 of the stopper member 32 toward the closed end by a predetermined distance. The proximal end portion of the tongue piece 32V is formed integrally with the other portion of the stopper member 32. The distal end portion of the tongue piece 32V can approach or separate from the inner peripheral edge of the opening portion 32a based on its own elastic force. A communication path 28R is formed in a portion facing the tongue piece 32V inside the guide portion 28B. One end of the communication path 28R opens into the hollow portion 24, and the other end of the communication path 28R opens on the outer peripheral surface of the guide portion 28B so as to face the tongue-shaped piece 32V. As partially enlarged in fig. 6B, the opening diameter of the other end of the communication path 28R is set smaller than the width W of the tip end portion of the tongue piece 32V.
Fig. 6A shows the following states: for example, when the pressure in the hollow portion 24 rapidly increases to a predetermined value or more, the distal end portion of the tongue piece 32V is separated from the outer peripheral surface of the guide portion 28B so as to open the open end of the other end of the communication path 28R. Thereby, the liquid refrigerant in the hollow portion 24 is discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, i.e., toward the downstream side, via the communication passage 28R.
A guide portion 28B is formed on an upstream side portion of the guide pipe 28 with respect to a communication hole 28C described later. The guide shaft 20P2 of the needle member 20 is slidably fitted into the hole 28B of the guide 28B.
The valve port 28P and the hole 28b of the valve seat 28V of the fixed portion 28A of the guide pipe 28 are formed on a common central axis. At this time, since the guide portion 28B and the fixing portion 28A of the guide pipe 28 are integrally formed, the valve port 28P and the hole portion 28B of the valve seat 28V are easily machined with high accuracy on a common central axis so that their centers coincide with each other.
A communication hole 28C is formed between the valve seat 28V of the fixing portion 28A and the guide portion 28B, and directly below the valve seat 28V. The communication hole 28C penetrating the guide pipe 28 in the radial direction communicates the valve port 28P between the outer peripheral portion of the guide pipe 28 and the inner peripheral portion 10a of the pipe main body 10.
The valve seat 28V of the guide tube 28 has a valve port 28P in the inner central portion into which the tapered portion 20P1 of the needle member 20 is inserted. The valve port 28P has a circular opening penetrating along the center axis of the valve seat 28V with a predetermined uniform diameter. The valve port 28P is not limited to this example, and may be formed to pass through the valve seat 28V along the center axis thereof so as to gradually open toward the one end 10E 1.
An involute portion 28d having an inner diameter gradually larger toward the downstream side than the diameter of the valve port 28P is formed inside the fixed portion 28A in a portion of the guide pipe 28 on the downstream side of the valve seat 28V. The involute portion 28d is continuous with an inner peripheral portion 28e of the cylindrical fixed portion 28A.
In this configuration, even when the temperature of the expansion device rises due to some cause, for example, a hot gas defrosting operation or the like, and the pressure in the hollow portion 24 of the stopper member 32 rises sharply to a predetermined value or more, as shown in fig. 6A, when the tip end portions of the tongue-shaped pieces 32V of the stopper member 32 are separated so as to open the opening end of the other end of the communication passage 28R due to the pressure in the hollow portion 24, the liquid refrigerant in the hollow portion 24 is easily discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, that is, toward the downstream side, through the communication passage 28R which is in the open state. Therefore, the foreign matter does not normally enter the hollow portion 24 from the outside, and the throttle device does not have a problem.
Fig. 7 is an enlarged view showing another example of the structure of the needle unit used in the throttle apparatus of the present invention. In fig. 7, the same components as those of the example shown in fig. 1 are denoted by the same reference numerals, and redundant description thereof will be omitted.
The needle assembly is configured to include: a guide tube 18; a needle member 20 inserted into the valve port 18P and the hole 18b of the guide pipe 18; a spring holder member 22 for screwing the adjustment screw 20P4 of the needle member 20 into a predetermined amount; and a coil spring 16 disposed between the spring support member 22 and an end of the guide portion 18B of the guide tube 18.
In the example shown in fig. 1, the through hole 12H constituting a part of the internal pressure release mechanism is formed in the stopper member 12 at a position separated from the recessed portion 12CA1 toward the closed end by a predetermined distance so as to face the outer peripheral surface of the guide portion 18B of the guide tube 18, but instead, in the example shown in fig. 7, the through hole 42H constituting a part of the internal pressure release mechanism may be provided at a position separated from the outer peripheral surface of the guide portion 18B of the guide tube 18, and the tongue piece 36 for opening and closing the through hole 42H may be joined to the outer peripheral portion of the stopper member 42.
The stopper member 42 is formed with a uniform thickness by press working using a copper alloy thin plate material, for example. The copper alloy thin plate material has a thickness of, for example, 3% or more and 10% or less, preferably 0.3mm or more and 0.9mm or less, of the inner diameter of the stopper member 12.
One end of the stopper member 42 is fixed to the guide portion 18B by a protrusion formed by a recess 42CA1 of the stopper member 42 by caulking, which bites into the groove 18CB1 at the end of the guide portion 18B. The dimples 42CA1 formed by the caulking process are formed at a plurality of, for example, three locations with a predetermined interval in the circumferential direction of the stopper member 42. The cylindrical stopper member 42 has a closed end portion at the other end and is configured to cover the coil spring 16 and the spring holder member 22.
The stopper member 42 extends from the guide portion 18B toward the one end 10E1 side of the tube main body 10. In addition, the closed end has a flat inner surface. The inner surface of the closed end is adapted to receive the end face 20P5 of the adjustment screw 20P 4. Inside the stopper 42, a hollow portion 24 into which the liquid refrigerant enters is formed.
A predetermined gap is formed between the inner peripheral surface of the stopper member 42 except the recessed portion 42CA1 and the outer peripheral surface of the guide portion 18B except the groove 18CB1 at the end portion thereof. Therefore, the refrigerant supplied from the one end 10E1 side of the tube main body 10 flows into the hollow portion 24 of the stopper member 42 through the gap.
Further, a circular through hole 42H constituting a part of the internal pressure release mechanism is formed in the stopper member 42 at a position distant from the recessed portion 42CA1 toward the closed end by a predetermined distance. The through hole 42H communicates with the hollow portion 24. The diameter of the through hole 42H is set to a size equal to or larger than the thickness of the stopper member 42, for example. A tongue piece 36 for opening and closing the through hole 42H is joined to the periphery of the through hole 42H. The proximal end of the tongue piece 36 is engaged with the stopper member 42 at a position close to the recess 42CA 1. The tongue piece 36 has a distal end portion capable of elastic displacement, and is provided with a first position at which the through hole 42H is closed by coming into contact with the outer peripheral surface of the stopper portion 42, and a second position at which the through hole 42H is opened by being separated from the through hole 42H by the pressure in the hollow portion 24. In fig. 7, a second position of the tip end portion of the tongue piece 36 is shown. Thereby, the liquid refrigerant in the hollow portion 24 is discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, i.e., toward the upstream side, through the through hole 42H in the open state.
In this configuration, even when the temperature of the expansion device rises due to some cause, for example, a hot gas defrosting operation or the like, and the pressure in the hollow portion 24 of the stopper member 42 rises sharply to a predetermined value or more, as shown in fig. 7, when the tip end portion of the tongue-shaped piece 36 of the stopper member 42 is separated so that the through hole 42H is opened by the pressure in the hollow portion 24, the liquid refrigerant in the hollow portion 24 is easily discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, i.e., toward the upstream side, through the through hole 42H. Therefore, the foreign matter does not normally enter the hollow portion 24 from the outside, and the throttle device does not have a problem.
Fig. 8 is an enlarged view showing another example of the structure of the needle unit used in the throttle apparatus of the present invention. In fig. 8, the same components as those of the example shown in fig. 7 are denoted by the same reference numerals, and redundant description thereof will be omitted.
The tongue-shaped piece 36 of the stopper member 42 shown in fig. 7 discharges the liquid refrigerant in the hollow portion 24 toward the upstream side, but instead, the tongue-shaped piece 38 of the stopper member 42 shown in fig. 8 discharges the liquid refrigerant in the hollow portion 24 toward the downstream side. A tongue-shaped piece 38 for opening and closing the through hole 42H is joined to the periphery of the through hole 42H. The base end portion of the tongue piece 38 is engaged with a position of the stopper member 42 adjacent to the through hole 42H distant from the recess 42CA 1. The tongue piece 38 has a distal end portion capable of elastic displacement, and is provided with a first position at which the through hole 42H is closed by coming into contact with the outer peripheral surface of the stopper portion 42, and a second position at which the through hole 42H is opened by being separated from the through hole 42H by the pressure in the hollow portion 24. In fig. 8, a second position of the tip end portion of the tongue piece 38 is shown. In this configuration, the temperature of the expansion device also rises due to some reason, for example, due to a hot gas defrosting operation or the like, and even when the pressure in the hollow portion 24 of the stopper member 42 rises sharply to a predetermined value or more, the liquid refrigerant in the hollow portion 24 is discharged into the inner peripheral portion 10a of the tube main body 10 in the direction indicated by the arrow LQ, that is, toward the downstream side, through the through hole 42H which is opened.
Further, although the above-described embodiments have been described in detail with reference to the drawings, specific configurations to which an example of the present invention can be applied are not limited to these embodiments, and design changes and the like (for example, the position and shape of holes, the shape of parts and the like) without departing from the scope of the present invention are also included in the present invention. In the description of the present specification, an example of a system using a hot-gas defrosting method is shown as an example of a cause of the expansion of the liquid refrigerant. However, as another cause of the volume expansion of the liquid refrigerant, there is also a temperature rise (not limited to a rapid temperature rise) of the throttle device portion in the case of use in various refrigeration cycles such as a normal refrigeration-only refrigeration cycle and a heat pump cycle, other than the above. Further, the temperature rise of the throttle device portion may be caused not only during the operation of the refrigeration cycle but also during non-operation.
Claims (5)
1. A throttle device is characterized by comprising:
A tube main body which is disposed in a pipe for supplying a refrigerant and has open ends at both ends for communicating with the pipe;
A valve seat disposed on an inner peripheral portion of the pipe main body and having a valve port;
A needle-like member having a tapered portion arranged so as to be able to approach or separate from the valve port of the valve seat and control an opening area of the valve port, and a guide shaft portion connected to a tip end of the tapered portion and extending toward an upstream side of the refrigerant flow away from the valve port;
A guide portion disposed on an upstream side of an inner peripheral portion of the tube main body with respect to a position of the valve seat in a flow of the refrigerant, the guide portion being configured to slidably dispose a guide shaft portion of the needle member;
a biasing member disposed between the guide portion and one of the open end portions of the tube main body, and biasing the needle member in a direction approaching the valve port of the valve seat;
A stopper member provided at an end of the guide portion so as to surround the guide shaft portion of the needle member and the biasing member, having a hollow portion into which the refrigerant enters, and being elastically displaceable; and
And an internal pressure release mechanism that releases the internal pressure in the hollow portion of the stopper member toward the inner peripheral portion of the tube main body when the pressure in the hollow portion becomes a predetermined value or more.
2. The throttle device of claim 1,
the internal pressure releasing mechanism is formed by the outer peripheral surface of the guide part and a through hole formed on the limiting component opposite to the outer peripheral surface of the guide part,
When the pressure in the hollow portion of the stopper member becomes a predetermined value or more, the peripheral edge of the through hole of the stopper member is separated from the outer peripheral surface of the guide portion, and the through hole communicates with the hollow portion.
3. the throttle device of claim 1,
The internal pressure releasing mechanism is formed of a communicating path provided in the guide portion and communicating the hollow portion of the stopper member with the outer peripheral surface of the guide portion, and a tongue-shaped piece opening and closing an opening end of the communicating path opened to the outer peripheral surface of the guide portion,
When the pressure in the hollow portion of the stopper member is equal to or higher than a predetermined value, the tongue-shaped piece opens the open end of the communication path.
4. The throttle device of claim 1,
The internal pressure releasing mechanism is formed of a through hole formed in the body portion of the stopper member and a tongue-shaped piece for opening and closing the through hole,
When the pressure in the hollow portion of the stopper member becomes a predetermined value or more, the tongue piece opens the through hole.
5. A refrigeration cycle system is characterized in that,
Comprises an evaporator, a compressor and a condenser,
The expansion device according to any one of claims 1 to 4, provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-109286 | 2017-06-01 | ||
| JP2017109286A JP6636990B2 (en) | 2017-06-01 | 2017-06-01 | Restrictor and refrigeration cycle system |
| PCT/JP2018/016165 WO2018221059A1 (en) | 2017-06-01 | 2018-04-19 | Throttle device and refrigeration cycle system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110582678A true CN110582678A (en) | 2019-12-17 |
| CN110582678B CN110582678B (en) | 2021-02-05 |
Family
ID=64454529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880029612.XA Active CN110582678B (en) | 2017-06-01 | 2018-04-19 | Throttling device and refrigeration cycle system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6636990B2 (en) |
| CN (1) | CN110582678B (en) |
| WO (1) | WO2018221059A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404879A (en) * | 2020-03-17 | 2021-09-17 | 株式会社鹭宫制作所 | Fixing structure of adjusting screw mechanism, valve device and refrigeration cycle system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6877079B2 (en) * | 2018-10-31 | 2021-05-26 | 株式会社大一商会 | Pachinko machine |
| JP6877080B2 (en) * | 2018-10-31 | 2021-05-26 | 株式会社大一商会 | Pachinko machine |
| JP7303143B2 (en) * | 2020-03-18 | 2023-07-04 | 株式会社鷺宮製作所 | Screw fixation structure, valve device, and refrigeration cycle system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588380A (en) * | 2014-11-12 | 2016-05-18 | 株式会社鹭宫制作所 | Throttling device and freezing circulating system with same |
| CN106164552A (en) * | 2014-04-17 | 2016-11-23 | 株式会社鹭宫制作所 | Throttling arrangement and the refrigerating circulation system possessing this throttling arrangement |
| CN106288548A (en) * | 2015-06-23 | 2017-01-04 | 株式会社鹭宫制作所 | Throttling arrangement and possess the refrigerating circulation system of this throttling arrangement |
| WO2017038271A1 (en) * | 2015-09-04 | 2017-03-09 | 株式会社鷺宮製作所 | Throttling device and refrigeration cycle |
| CN106546038A (en) * | 2015-09-17 | 2017-03-29 | 株式会社鹭宫制作所 | Throttling arrangement and possesses the refrigerating circulation system of the throttling arrangement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0571830A (en) * | 1991-09-17 | 1993-03-23 | Mitsubishi Electric Corp | Freezing device |
| DE102004010997B3 (en) * | 2004-03-03 | 2005-06-23 | Otto Egelhof Gmbh & Co. Kg | Control method for expansion valve for refrigeration medium circuit in automobile air-conditioning installation using pressure difference between input and output of expansion valve |
-
2017
- 2017-06-01 JP JP2017109286A patent/JP6636990B2/en active Active
-
2018
- 2018-04-19 WO PCT/JP2018/016165 patent/WO2018221059A1/en active Application Filing
- 2018-04-19 CN CN201880029612.XA patent/CN110582678B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106164552A (en) * | 2014-04-17 | 2016-11-23 | 株式会社鹭宫制作所 | Throttling arrangement and the refrigerating circulation system possessing this throttling arrangement |
| CN105588380A (en) * | 2014-11-12 | 2016-05-18 | 株式会社鹭宫制作所 | Throttling device and freezing circulating system with same |
| CN106288548A (en) * | 2015-06-23 | 2017-01-04 | 株式会社鹭宫制作所 | Throttling arrangement and possess the refrigerating circulation system of this throttling arrangement |
| WO2017038271A1 (en) * | 2015-09-04 | 2017-03-09 | 株式会社鷺宮製作所 | Throttling device and refrigeration cycle |
| CN106546038A (en) * | 2015-09-17 | 2017-03-29 | 株式会社鹭宫制作所 | Throttling arrangement and possesses the refrigerating circulation system of the throttling arrangement |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404879A (en) * | 2020-03-17 | 2021-09-17 | 株式会社鹭宫制作所 | Fixing structure of adjusting screw mechanism, valve device and refrigeration cycle system |
| CN113404879B (en) * | 2020-03-17 | 2023-06-20 | 株式会社鹭宫制作所 | Fixing structure of adjusting screw mechanism, valve device and refrigeration cycle system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018221059A1 (en) | 2018-12-06 |
| JP6636990B2 (en) | 2020-01-29 |
| CN110582678B (en) | 2021-02-05 |
| JP2018204840A (en) | 2018-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110582678B (en) | Throttling device and refrigeration cycle system | |
| EP1832822B1 (en) | Expansion valve | |
| JP5971871B2 (en) | Aperture device | |
| US5588590A (en) | Expansion valve combined with a solenoid valve | |
| JP6231662B2 (en) | Throttle device and refrigeration cycle system including the same | |
| JP6231509B2 (en) | Throttle device and refrigeration cycle | |
| JP2007285159A (en) | Control valve for variable displacement compressor | |
| JP6216681B2 (en) | Aperture device | |
| CN109425153B (en) | Throttling device and refrigeration circulating system | |
| CN107636406B (en) | Throttle device and refrigeration cycle | |
| JP6031078B2 (en) | Throttle device and refrigeration cycle system including the same | |
| KR20140076507A (en) | Control valve | |
| JP2017058081A (en) | Throttle device and refrigeration cycle system including the same | |
| US20220146160A1 (en) | Expansion valve | |
| WO2016194388A1 (en) | Throttle device and refrigeration cycle system with same | |
| JP2004068955A (en) | Differential pressure control valve | |
| US20110126921A1 (en) | Integration of a delta-p expansion valve for cop-optimal regulation in a high-pressure connection, in particular an internal heat exchanger | |
| CN109804210B (en) | Throttling device and refrigeration cycle system | |
| JP2015218948A (en) | Throttle device and refrigeration cycle system | |
| JP2005257203A (en) | Expander | |
| CN112413172B (en) | Flow path switching valve | |
| JP6178374B2 (en) | Throttle device and refrigeration cycle system including the same | |
| JP2020041757A (en) | Expansion valve | |
| JP2018063053A (en) | Throttle device and refrigeration cycle | |
| CN116104975A (en) | Valve device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |