Temperature expansion valve and refrigeration cycle system
阅读说明:本技术 温度膨胀阀以及冷冻循环系统 (Temperature expansion valve and refrigeration cycle system ) 是由 关谷到 大河原一郎 桥本和树 于 2020-03-12 设计创作,主要内容包括:本发明提供一种温度膨胀阀、以及具备该温度膨胀阀的冷冻循环系统,即使水分在配置有密封部件的部分冻结也能够维持密封性。该温度膨胀阀配管连接在冷冻循环的冷凝器与蒸发器之间,在阀壳的安装孔内具备调整螺纹件,该调整螺纹件调整对阀芯向闭阀方向施力的施力弹簧的作用力来调整过热度设定,在上述调整螺纹件中,形成有配置环状的密封部件的配置部,在上述配置部配置有沿上述阀芯的移动方向对上述密封部件施力的弹性部件。(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.)
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.
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
Disclosure of Invention
Problems to be solved by the invention
Here, in the
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
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
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
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
Fig. 3 is a partially enlarged view of a portion enclosed by a circle a of fig. 2. As shown in fig. 3, an
The
The
As described above, since the
As the
The pressing
In this way, by disposing the pressing
Further, the mounting hole 36 is fitted with a C-shaped ring 58 for preventing the
A
Further, a diaphragm device 22 is mounted above the valve
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
Here, when the moisture entering the
Further, by disposing the
When the
According to the temperature expansion valve 4 of this embodiment, the
Further, the sealing
In the temperature expansion valve 4 of the above-described embodiment, it is conceivable to use, for the sealing
In the temperature expansion valve 4 of the above-described embodiment, a coil compression spring may be used as the
In the temperature expansion valve 4 of the above-described embodiment, the
In the temperature expansion valve 4 of the above-described embodiment, the sealing
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