CN111750167A - Temperature expansion valve and refrigeration cycle system - Google Patents
Temperature expansion valve and refrigeration cycle system Download PDFInfo
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- CN111750167A CN111750167A CN202010172135.1A CN202010172135A CN111750167A CN 111750167 A CN111750167 A CN 111750167A CN 202010172135 A CN202010172135 A CN 202010172135A CN 111750167 A CN111750167 A CN 111750167A
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- Prior art keywords
- valve
- temperature expansion
- expansion valve
- elastic member
- refrigeration cycle
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/128—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like servo actuated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/064—Superheater expansion valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
The invention provides a temperature expansion valve and a refrigeration cycle system with the temperature expansion valve, which can maintain the sealing performance even if the moisture is frozen at the part where a sealing component is arranged. The temperature expansion valve pipe is connected between a condenser and an evaporator of a refrigeration cycle, and an adjustment screw for adjusting the superheat setting by adjusting the biasing force of a biasing spring that biases a valve element in a valve closing direction is provided in a mounting hole of a valve housing.
Description
Technical Field
The present invention relates to a temperature expansion valve that adjusts a valve opening degree by sensing an outlet side temperature of an evaporator and controls a superheat degree of a refrigeration cycle, and a refrigeration cycle including the temperature expansion valve.
Background
Conventionally, a temperature expansion valve 102 such as that shown in fig. 7 has been used in a refrigeration cycle (for example, patent document 1). The temperature expansion valve 102 controls the valve opening degree of the valve element 108 in accordance with the pipe temperature on the outlet side of the evaporator sensed by the temperature sensing cylinder 104, thereby maintaining the degree of superheat in the refrigeration cycle within a constant range. The temperature expansion valve 102 includes an urging spring 112 for urging the valve element 108 in the valve closing direction and an adjustment screw 114 for adjusting the urging force of the urging spring 112 with respect to the valve element 108, below the valve main body 110. The adjustment of the superheat setting is performed by adjusting the urging force of the urging spring 112 by turning the adjustment screw 114. A seal cap 116 is provided below the adjustment screw 114 to seal a lower portion of the valve main body 110 accommodating the adjustment screw 114.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2010-281337
Disclosure of Invention
Problems to be solved by the invention
Here, in the temperature expansion valve 102, the valve main body 110 is cooled to a low temperature of 0 ℃. When the cooling becomes rapid, moisture in the air freezes to cause frost formation on the valve main body 110. Further, for example, when the temperature of the valve main body 110 is increased by a defroster or the like, frost formed on the valve main body 110 is melted and turns into moisture.
However, in the case where the adjustment operation (evaluation test) of the refrigeration cycle is performed, or the like, and in the case where the adjustment frequency of the degree of superheat at rest is high, or the like, the sealing lid 116 may be forgotten to be closed. When the seal cap 116 comes off, the seal cap 116 releases the seal of the lower portion of the valve main body 110.
When the sealing of the lower portion of the valve main body 110 is released, moisture due to frost or the like may enter the valve main body 110 as indicated by an arrow in fig. 8 and reach the O-ring 120 attached to the adjustment screw 114. When water freezes in groove 126 where O-ring 120 is disposed, the water freezes to become ice 130 as shown in fig. 9, and the volume expands. In this case, the O-ring 120 may be partially lifted or irregularly deformed over the entire O-ring 120, which may reduce the sealing performance of the O-ring 120.
As described above, when the sealing performance of the O-ring 120 is lowered, the refrigerant may leak to the outside of the valve body 110. Further, if the refrigerant leaks from the portion at the position of the O-ring 120, the valve main body 110 is further cooled, and the O-ring 120 itself may be solidified. In this case, a vicious circle in which the sealing property is lowered occurs.
The purpose of the present invention is to provide a temperature expansion valve capable of maintaining sealing properties even if moisture freezes in a portion where a sealing member is disposed, and a refrigeration cycle system provided with the temperature expansion valve.
Means for solving the problems
The temperature expansion valve of the present invention is a temperature expansion valve in which a pipe is connected between a condenser and an evaporator of a refrigeration cycle, and an adjustment screw for adjusting superheat setting by adjusting an urging force of an urging spring for urging a valve element in a valve closing direction is provided in a mounting hole of a valve housing,
the adjusting screw is provided with an arrangement part for arranging an annular sealing component,
an elastic member that biases the seal member in a direction in which the valve element moves is disposed in the disposition portion.
In this way, by disposing the elastic member in the disposition portion, the sealing property of the sealing member can be maintained even if moisture freezes in the portion where the sealing member is disposed. For example, even when moisture freezes to form ice in the arrangement portion and expands in volume, the sealing member is locally lifted by the ice, or the sealing member freezes and irregularly deforms over the entire sealing member, the elastic member can press the sealing member, and a gap can be prevented from being locally formed in a portion where the sealing member is arranged.
In addition, the temperature expansion valve of the present invention is characterized in that,
the arrangement unit includes:
a holding portion that projects outward from an end of the arrangement portion located on a valve closing operation direction side of the valve body, and holds the sealing member and the elastic member in the arrangement portion;
a wall surface having an outer peripheral diameter smaller than the other outer peripheral portion of the adjusting screw inserted into the mounting hole; and
and a bottom surface which supports the sealing member by forming a step between the wall surface and the other outer peripheral portion on an outer periphery of an end portion of the arrangement portion located on a valve opening operation direction side of the valve body.
In this way, the arrangement portion includes a holding portion that protrudes outward in the radial direction, a wall surface that makes the outer periphery small in diameter, and a bottom surface that supports the seal member, and thereby an annular space is formed in the adjustment screw. By disposing the seal member and the elastic member in the annular space, the outer peripheral surfaces of the seal member and the elastic member can be fitted to the adjustment screw so as to be substantially flush with the other outer peripheral portions. Further, by forming the holding portion protruding to the outer diameter side at the upper end, the seal member and the elastic member are held in the arrangement portion so as not to fall off from the arrangement portion.
In addition, the temperature expansion valve of the present invention is characterized in that,
the holding portion is a claw portion formed by bending the end portion of the adjustment screw on the valve element side to the outer diameter side.
Thus, the elastic member is held by the claw portion by forming the claw portion.
In addition, the temperature expansion valve of the present invention is characterized in that,
in the arrangement portion, a pressing member that presses the seal member by receiving an elastic force of the elastic member is arranged between the seal member and the elastic member.
In this way, by disposing the pressing member between the seal member and the elastic member, the seal member can be pressed with a uniform elastic force.
In addition, the temperature expansion valve of the present invention is characterized in that,
the pressing member has an L-shaped cross section, and includes:
a side wall having an outer peripheral surface that slides in the mounting hole; and
and a bottom portion that protrudes radially inward from an end of the side wall located on a valve opening operation direction side of the valve body, and supports the elastic member.
In this way, the elastic member is supported by the bottom of the pressing member having an L-shaped cross section and is disposed on the inner peripheral side of the side wall, thereby preventing the pressing member from tilting when moving in the axial direction.
In addition, the temperature expansion valve of the present invention is characterized in that,
the elastic member is a plate spring or a helical compression spring.
Thus, the elastic member preferably uses a spring.
In addition, the temperature expansion valve of the present invention is characterized in that,
the sealing member is an O-ring.
Thus, the sealing member preferably uses an O-ring.
The refrigeration cycle system of the present invention is a refrigeration cycle system including a compressor, a condenser, and an evaporator, and is characterized by using the temperature expansion valve of the present invention.
Such a temperature expansion valve is suitable for use in a refrigeration cycle because the valve opening of the valve body can be controlled according to the pipe temperature on the outlet side of the evaporator, and the flow rate can be controlled.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a temperature expansion valve capable of maintaining sealing performance even if moisture freezes in a portion where a sealing member is disposed, and a refrigeration cycle including the temperature expansion valve.
Drawings
Fig. 1 is a diagram showing a refrigerant circuit of a refrigeration cycle system according to an embodiment.
Fig. 2 is a schematic cross-sectional view of the temperature expansion valve according to the embodiment.
Fig. 3 is a partially enlarged view showing a main portion of the temperature expansion valve according to the embodiment.
Fig. 4 is a partially enlarged view of the temperature expansion valve of the embodiment.
Fig. 5 is a partially enlarged view of a main portion of the temperature expansion valve according to the embodiment when moisture freezes.
Fig. 6 is a partially enlarged view of the temperature expansion valve according to another embodiment.
Fig. 7 is a schematic cross-sectional view of a conventional temperature expansion valve.
Fig. 8 is a partially enlarged view showing a main portion of a conventional temperature expansion valve.
Fig. 9 is a partially enlarged view showing a portion of a conventional temperature expansion valve where an O-ring is disposed.
In the figure:
2-a refrigeration cycle system, 4-a temperature expansion valve, 6-a compressor, 8-a condenser, 10-an evaporator, 12-a first pipe joint, 14-a second pipe joint, 16-a pressure equalizing pipe, 18-a temperature sensing cylinder, 20-a capillary tube, 22-a diaphragm device, 24-a valve main body, 26-a first port, 28-a second port, 30-a valve port, 32-a pressure equalizing pipe, 34-a guide hole, 36-a mounting hole, 38-a valve core, 38 a-a needle portion, 38 b-a valve core portion, 38 c-a protrusion portion, 39 a-a large diameter portion, 39 b-a medium diameter portion, 39 c-a small diameter portion, 40-a pressing plate, 40 a-a through hole, 42-a diaphragm, 44-an adjusting screw, 46-an urging spring, 48-a stopper, 50-a sealing member, 52-a disposition portion, 52 a-claw portion, 52 b-a wall surface, 52 c-a bottom surface, 54-a side wall portion, 54 b-a bottom portion, 56-an elastic member, 58-ring, 60-sealing member, 62-step portion, 64-sealing cap, 66-upper cap, 68-lower cap, 70-pressure receiving chamber, 72-pressure equalizing chamber, 74-sealing member, 74 a-gasket, 74 b-plate spring, 76-pressing member, 90-ice, 92-flange, 102-temperature expansion valve, 104-temperature sensing cylinder, 108-valve core, 110-valve body, 116-sealing cap, 120-O-ring, 122-inlet joint, 124-outlet joint, 126-groove portion, 130-ice, 201-first pipe, 202-second pipe, 203-outlet-side pipe, L-axis.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing a refrigerant circuit of a refrigeration cycle system according to an embodiment. As shown in fig. 1, the refrigeration cycle 2 is configured by annularly connecting the temperature expansion valve 4, the compressor 6, the condenser 8, and the evaporator 10 of the embodiment with pipes.
In the refrigeration cycle 2, the temperature expansion valve 4 of the embodiment is configured such that the first pipe joint 12 is connected to the first pipe 201 on the condenser 8 side, the second pipe joint 14 is connected to the second pipe 202 on the evaporator 10 side, and the pressure equalizing pipe 16 is connected to the outlet-side pipe 203 of the evaporator 10.
In this refrigerant circuit, the refrigerant compressed by the compressor 6 is condensed and liquefied by the condenser 8, and flows into the temperature expansion valve 4 via the first pipe joint 12. The refrigerant flowing into the temperature expansion valve 4 is decompressed and expanded in the temperature expansion valve 4, flows into the evaporator 10 from the second pipe joint 14, is evaporated and gasified, and again flows into the compressor 6.
A temperature-sensing cylinder 18 is attached to the outlet-side pipe 203 on the evaporator 10 side, and the temperature-sensing cylinder 18 is filled with, for example, the same kind of gas refrigerant or liquid refrigerant as the refrigerant circulating in the refrigerant circuit. The temperature sensing tube 18 is provided in the temperature expansion valve 4, and is connected to a diaphragm device 22 via a capillary tube 20.
Fig. 2 is a schematic cross-sectional view of the temperature expansion valve 4 according to the embodiment. In the present specification, "upper" or "lower" is an upper or lower level defined in the state of fig. 2. That is, the valve element 38 is located above the adjusting screw 44. As shown in fig. 2, the temperature expansion valve 4 includes a valve main body 24 made of metal such as brass, for example. The valve body 24 is formed with a first port 26 connected to the first pipe joint 12, a second port 28 connected to the second pipe joint 14, and a valve port 30 located between the first port 26 and the second port 28. The valve main body 24 is formed with a pressure equalizing passage 32 connected to the pressure equalizing pipe 16, and the valve main body 24 is formed with a guide hole 34 and a mounting hole 36, respectively, which are cylindrical and have the central axis of the valve port 30 as the axis L. The first port 26 opens at the side of the guide hole 34, and the mounting hole 36 is located below the valve port 30.
Further, a valve body 38 is disposed in the guide hole 34. The valve body 38 includes a columnar needle portion 38a positioned in the guide hole 34, and a valve body portion 38b having a larger diameter than the needle portion 38a and positioned on the second port 28 side. The valve body 38 is accommodated in the guide hole 34 so as to be movable in the direction of the axis L, and the valve port 30 is opened and closed by the movement of the valve body 38b in the direction of the axis L. Further, the valve body 38 is connected to a diaphragm 42 of the diaphragm device 22 via a pressure plate 40 fitted to an end portion of the needle portion 38a on the opposite side to the valve body portion 38 b.
The mounting hole 36 includes: an adjustment screw 44 having an external thread 44a on the outer periphery; an urging spring 46 disposed in the central hole of the adjustment screw 44; and a stopper 48 disposed at an end of the urging spring 46. Here, the adjustment screw 44 is attached to the valve main body 24 by screwing the male screw 44a into the female screw 36a formed on the inner peripheral surface of the attachment hole 36. The stopper 48 is fitted to a projection 38c projecting downward of the valve body 38 b. The valve body 38 is biased toward the diaphragm 42, which is a valve closing direction of the valve port 30, by the elastic force of the biasing spring 46. Further, the degree of superheat setting can be adjusted by adjusting the biasing force of the biasing spring 46 against the valve element 38 by rotating the adjustment screw 44.
Fig. 3 is a partially enlarged view of a portion enclosed by a circle a of fig. 2. As shown in fig. 3, an arrangement portion 52 in which the annular seal member 50 is arranged is formed on the outer periphery of the adjustment screw 44 on the valve closing operation direction side of the valve body 38. The arrangement portion 52 has an annular space formed by making the outer peripheral diameter smaller than the other outer peripheral portion forming the adjustment screw 44 inserted into the mounting hole 36. The annular space is surrounded by the claw portion 52a, the wall surface 52b, and the bottom surface 52c of the arrangement portion 52, and the pressing member 54 and the elastic member 56 are arranged in the arrangement portion 52, that is, in the annular space, in addition to the sealing member 50.
The claw portion 52a projects outward in the radial direction from the upper end of the adjustment screw 44 (the end on the valve closing operation direction side of the valve body 38) where the arrangement portion 52 is formed, and the cylindrical end of the adjustment screw 44 is swaged to the outer diameter side. The claw portion 52a functions as a holding portion for holding the sealing member 50, the pressing member 54, and the elastic member 56 in the arrangement portion 52 so as not to fall off from the arrangement portion 52.
The wall surface 52b is an outer wall surface of a portion having an outer periphery smaller in diameter than the other outer peripheral portion of the adjustment screw 44 inserted into the mounting hole 36, and is in close contact with the inner peripheral surface of the seal member 50. The bottom surface 52c forms a step with the other outer peripheral portion of the wall surface 52b at the outer periphery of the lower end of the arrangement portion 52 (the end portion on the valve-opening operation direction side of the valve body 38). The sealing member 50 is bottomed on the bottom surface 52 c.
As described above, since the arrangement portion 52 includes the claws 52a, the wall surfaces 52b, and the bottom surface 52c, an annular space surrounded by the claws 52a, the wall surfaces 52b, and the bottom surface 52c is formed in the adjustment screw 44. By disposing the seal member 50, the pressing member 54, and the elastic member 56 in the annular space, the outer peripheral surfaces of the seal member 50, the pressing member 54, and the elastic member 56 can be fitted to the adjustment screw 44 so as to be substantially flush with the other outer peripheral portions of the adjustment screw 44.
As the seal member 50, for example, an O-ring made of NBR (nitrile rubber), H-NBR (hydrogenated nitrile rubber), or the like is used. The seal member 50 is interposed between the adjustment screw 44 and the valve main body 24 in a direction orthogonal to the direction of the axis L, and the outer peripheral surface of the seal member 50 is in close contact with the inner peripheral surface of the valve main body 24. Further, the inner peripheral surface of the seal member 50 is also in close contact with the wall surface 52b of the arrangement portion 52. That is, the mounting hole 36 is divided into a low-pressure side space and an atmosphere side space (a space that expands toward the valve opening operation direction side of the valve body 38 than a portion where the outer peripheral surface of the sealing member 50 is in close contact with the inner peripheral surface of the valve body 24 and a portion where the inner peripheral surface of the sealing member 50 is in close contact with the wall surface 52b of the arrangement portion 52) in a region on the downstream side of the valve port 30 by the sealing member 50. Thereby, the atmosphere outside the valve main body 24 is hermetically separated from the refrigerant decompressed through the valve port 30.
The pressing member 54 is a member that presses the seal member 50 in an L-shaped cross section, and is formed of metal such as stainless steel or brass, for example. The pressing member 54 includes: a side wall 54a having an outer peripheral surface that slides in the mounting hole 36; and a bottom portion 54b that protrudes inward in the radial direction at the lower end of the side wall 54a (the end portion on the valve opening operation direction side of the valve body 38) and on which the elastic member 56 is seated. The elastic member 56 is disposed in a space formed on the inner peripheral side of the side wall 54a at the bottom portion 54b of the pressing member 54. As the elastic member 56, for example, a plate spring or the like is used.
In this way, by disposing the pressing member 54 between the seal member 50 and the elastic member 56, the seal member 50 can be pressed downward with a uniform elastic force via the pressing member 54. Thereby, the sealing member 50 is held in the arrangement portion 52 in a state of being bottomed on the bottom surface 52 c. Further, the elastic member 56 is disposed on the inner peripheral side of the side wall 54a so as to be adjacent to the bottom portion 54b of the pressing member 54 having the L-shaped cross section, thereby preventing the pressing member 54 from being inclined when moving in the direction of the axis L.
Further, the mounting hole 36 is fitted with a C-shaped ring 58 for preventing the adjustment screw 44 from coming off. A stepped portion 62 in which an annular sealing member 60 is disposed is formed in an opening at the lower end of the mounting hole 36. Further, the sealing member 60 is formed of Polytetrafluoroethylene (PTFE).
A seal cap 64 for sealing the mounting hole 36 is detachably attached to a lower end portion of the mounting hole 36. Specifically, the seal cover 64 is attached by screwing a male screw 64a formed on the outer periphery of the seal cover 64 and a female screw 36b formed on the inner periphery of the lower end portion of the attachment hole 36. The sealing member 60 before mounting is formed to be thicker than the depth of the step portion 62. Therefore, when the seal cap 64 is screwed after the sealing member 60 is attached to the stepped portion 62, the sealing member 60 is slightly crushed and plastically deformed to seal the attachment hole 36.
Further, a diaphragm device 22 is mounted above the valve main body 24. The diaphragm device 22 has a case structure including an upper cover 66 and a lower cover 68 formed of a metal such as stainless steel, for example, and the lower portion of the lower cover 68 is screwed to the upper end of the valve main body 24 and is fitted to the guide hole 34. Further, a diaphragm 42 that divides the interior of the case into a pressure equalizing chamber 72 and a pressure receiving chamber 70 is provided between the upper cover 66 and the lower cover 68.
Here, the pressure equalizing chamber 72 communicates with the outlet-side pipe 203 of the evaporator 10 via the pressure equalizing passage 32 and the pressure equalizing pipe 16, and the evaporation pressure of the outlet-side pipe 203 is introduced into the pressure equalizing chamber 72 via the pressure equalizing pipe 16 and the pressure equalizing passage 32. On the other hand, the pressure receiving chamber 70 is connected to the temperature sensing cylinder 18 via the capillary tube 20, and the internal pressure of the pressure receiving chamber 70 changes in accordance with the temperature sensed by the temperature sensing cylinder 18. The pressure difference between the pressure receiving chamber 70 and the pressure equalizing chamber 72 displaces the diaphragm 42, and the displacement of the diaphragm 42 is transmitted to the valve body 38 via the pressure plate 40.
Therefore, when the temperature sensed by the outlet-side pipe 203 of the temperature sensing cylinder 18 increases, the valve body 38b moves in the direction of opening the valve port 30, and when the temperature sensed by the outlet-side pipe 203 of the temperature sensing cylinder 18 decreases, the valve body 38b moves in the direction of closing the valve port 30. Further, when the evaporation pressure of the evaporator 10 decreases, the valve body 38b moves in the direction to open the valve port 30, and when the evaporation pressure increases, the valve body 38b moves in the direction to close the valve port 30. That is, the valve opening degree of the valve port 30 of the second pipe 202 for passing the refrigerant from the first pipe 201 on the condenser 8 side to the evaporator 10 side is controlled in accordance with the sensed temperature and the evaporation pressure of the temperature sensing cylinder 18, and the superheat degree control of the refrigerant circuit is executed.
Fig. 4 is a partially enlarged view of a portion surrounded by a circle B of fig. 2. As shown in fig. 4, the upper end portion of the needle portion 38a of the valve body 38 has a large diameter portion 39a, a medium diameter portion 39b, and a small diameter portion 39c formed from the lower side to the upper side of fig. 4 so that the diameter decreases as the needle portion approaches the diaphragm device 22. Here, a presser plate 40 is attached to an end of the needle portion 38a so that the small diameter portion 39c fits into the through hole 40 a.
A seal member 74 and a pressing member 76 for pressing the seal member 74 to a predetermined position are disposed on the outer periphery of the intermediate diameter portion 39b of the needle portion 38 a. The seal member 74 is composed of a Polytetrafluoroethylene (PTFE) gasket 74a and a metal leaf spring 74b, both having an annular disk shape, and the gasket 74a and the leaf spring 74b are fitted into the intermediate diameter portion 39b so that the leaf spring 74b is on the large diameter portion 39a side. According to the above configuration, a high sealing performance can be achieved between the pressure equalizing chamber 72 and the first port 26 with respect to the differential pressure between the evaporation pressure introduced into the pressure equalizing pipe 16 and the primary pressure of the first port 26.
The operation of the temperature expansion valve 4 of the above-described embodiment will be specifically described below. First, in the adjustment operation of the refrigeration cycle, the seal cap 64 is removed and forgotten to be closed, and the seal of the seal cap 64 to the lower portion of the valve main body 24 is released. In this case, moisture due to frost or the like adhering to the lower portion of the valve main body 24 is guided to the valve closing operation direction side of the valve body 38 along the screw coupling portion between the mounting hole 36 and the adjustment screw 44 by capillary action. Thereby, as shown by the arrow in fig. 5, moisture enters the inside of the valve main body 24 and reaches the position of the seal member 50.
Here, when the moisture entering the arrangement portion 52 is frozen as it is, ice 90 is generated and expands in volume. In addition, in the annular arrangement portion 52, when the thickness of the ice 90 is not uniformly formed, the seal member 50 is partially lifted toward the valve element 38 by the ice 90. However, since the seal member 50 is uniformly pressed downward by the elastic member 56 via the pressing member 54, local deformation of the seal member 50 is minimized, and a gap is prevented from being locally generated between the seal member 50 and the arrangement portion 52 or the valve main body 24. This can maintain the sealing performance of the sealing member 50.
Further, by disposing the elastic member 56 in the disposition portion 52, even when the seal member 50 is lifted, the holding portion (the claw portion 52a) is prevented from being excessively pressed. Specifically, even if the volume of the moisture expands to produce ice 90 and the sealing member 50 is lifted, the pressing member 54 is lifted in conjunction with this. At this time, the elastic member 56 held by the holding portion (claw portion 52a) contracts, and the holding portion (claw portion 52a) can be prevented from being pressed excessively, so that the sealing performance of the temperature expansion valve 4 can be maintained even when the moisture that has entered the arrangement portion 52 freezes as it is.
When the ice 90 melts again, the sealing member 50 moves downward via the pressing member 54 by the pressing force of the elastic member 56. When the ice 90 melts completely and becomes moisture, the sealing member 50 bottoms on the arrangement portion 52, and the moisture is discharged from the arrangement portion 52.
According to the temperature expansion valve 4 of this embodiment, the elastic member 56 is disposed in the disposition portion 52, and therefore, even when moisture due to frost or the like freezes in the disposition portion 52 and expands in volume, the sealing performance of the sealing member 50 can be maintained.
Further, the sealing member 50 may freeze and irregularly deform over the entire sealing member 50. Even in this case, by uniformly pressing the seal member 50 downward via the pressing member 54 by the elastic member 56, irregular deformation of the seal member 50 is suppressed, and a gap is prevented from being locally generated between the seal member 50 and the arrangement portion 52 or the valve main body 24, thereby maintaining the sealing property of the seal member 50.
In the temperature expansion valve 4 of the above-described embodiment, it is conceivable to use, for the sealing member 50, a composite sealing member in which an O-ring and an annular member having a C-shaped cross section made of a fluorine-based resin material such as PTFE are combined, in addition to the O-ring.
In the temperature expansion valve 4 of the above-described embodiment, a coil compression spring may be used as the elastic member 56 instead of the plate spring. The helical compression spring and the plate spring are formed of metal such as stainless steel. In addition, an elastic body such as rubber may be used in addition to the spring. Even in this case, when moisture due to frost formation or the like freezes in the arrangement portion 52 and expands in volume, the sealing performance of the sealing member 50 can be maintained.
In the temperature expansion valve 4 of the above-described embodiment, the claw portion 52a does not have to be formed as a holding portion. For example, as shown in fig. 6, a flange 92 protruding outward in the radial direction may be formed as a holding portion at the end of the adjusting screw 44 on the valve body 38 side. In this case, the sealing member 50, the pressing member 54, and the elastic member 56 are interposed between the flange 92 and the bottom portion 54b of the pressing member 54. Further, the flange 92 is welded and fixed to the adjustment screw 44.
In the temperature expansion valve 4 of the above-described embodiment, the sealing member 50 does not have to be directly attached to the bottom surface 52c of the arrangement portion 52. For example, the sealing member 50 may be supported by the bottom surface 52c via a member such as a protective ring. Similarly, in the pressing member 54, the elastic member 56 may be supported by the bottom portion 54b via a member such as a guard ring, instead of directly abutting on the bottom portion 54 b.
Claims (8)
1. A temperature expansion valve, a pipe is connected between a condenser and an evaporator of a refrigeration cycle, an adjusting screw is provided in a mounting hole of a valve housing, the adjusting screw adjusts the acting force of a force application spring which applies force to a valve core in a valve closing direction to adjust superheat degree setting,
the above-mentioned temperature expansion valve is characterized in that,
the adjusting screw is provided with an arrangement part for arranging an annular sealing component,
an elastic member that biases the seal member in a direction in which the valve element moves is disposed in the disposition portion.
2. A temperature expansion valve according to claim 1,
the arrangement unit includes:
a holding portion that projects outward from an end of the arrangement portion located on a valve closing operation direction side of the valve body, and holds the sealing member and the elastic member in the arrangement portion;
a wall surface having an outer peripheral diameter smaller than the other outer peripheral portion of the adjusting screw inserted into the mounting hole; and
and a bottom surface which supports the sealing member by forming a step between the wall surface and the other outer peripheral portion on an outer periphery of an end portion of the arrangement portion located on a valve opening operation direction side of the valve body.
3. A temperature expansion valve according to claim 2,
the holding portion is a claw portion formed by bending an end portion of the adjustment screw on a valve closing operation direction side of the valve body to an outer diameter side.
4. A temperature expansion valve according to any one of claims 1 to 3,
in the arrangement portion, a pressing member that presses the seal member by receiving an elastic force of the elastic member is arranged between the seal member and the elastic member.
5. A temperature expansion valve according to claim 4,
the pressing member has an L-shaped cross section, and includes:
a side wall having an outer peripheral surface that slides in the mounting hole; and
and a bottom portion that protrudes radially inward from an end of the side wall located on a valve opening operation direction side of the valve body, and supports the elastic member.
6. A temperature expansion valve according to any one of claims 1 to 5,
the elastic member is a plate spring or a helical compression spring.
7. A temperature expansion valve according to any one of claims 1 to 6,
the sealing member is an O-ring.
8. A refrigeration cycle system comprises a compressor, a condenser and an evaporator, and is characterized in that,
a temperature expansion valve according to any of claims 1 to 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-063336 | 2019-03-28 | ||
| JP2019063336A JP7014749B2 (en) | 2019-03-28 | 2019-03-28 | Temperature expansion valve and refrigeration cycle system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111750167A true CN111750167A (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010172135.1A Pending CN111750167A (en) | 2019-03-28 | 2020-03-12 | Temperature expansion valve and refrigeration cycle system |
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| Country | Link |
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| JP (1) | JP7014749B2 (en) |
| CN (1) | CN111750167A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762329B (en) * | 2021-01-19 | 2022-06-24 | 深圳市磐锋精密技术有限公司 | Pressure sensor sealing ring mounting structure and mounting method thereof |
| JPWO2022224982A1 (en) * | 2021-04-21 | 2022-10-27 | ||
| CN115013587B (en) * | 2022-08-02 | 2023-01-03 | 浙江轩安居暖通科技有限公司 | Self-operated temperature control valve capable of controlling pressure |
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- 2019-03-28 JP JP2019063336A patent/JP7014749B2/en active Active
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2020
- 2020-03-12 CN CN202010172135.1A patent/CN111750167A/en active Pending
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| US4183541A (en) * | 1977-10-31 | 1980-01-15 | Borg-Warner Corporation | Mechanical seal assembly |
| DE10061426A1 (en) * | 2000-12-09 | 2002-08-01 | Bayerische Motoren Werke Ag | Sealing system for use between casing and shaft or pipe comprises sealing ring with L-shaped cross-section, one arm of L resting against shaft while other is pressed against casing by spring |
| CN201496568U (en) * | 2009-06-11 | 2010-06-02 | 浙江永盛仪表有限公司 | Single-seat pressure balance adjusting valve |
| CN102759234A (en) * | 2011-04-27 | 2012-10-31 | 株式会社鹭宫制作所 | Thermostatic expansion valve |
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| US20170299087A1 (en) * | 2016-04-19 | 2017-10-19 | Truflo Rona, S. R. L. | Sealing device for a stem of a valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020165441A (en) | 2020-10-08 |
| JP7014749B2 (en) | 2022-02-01 |
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