CN214406581U - Screw fitting structure, screw fixing structure, valve device, and refrigeration cycle system - Google Patents
Screw fitting structure, screw fixing structure, valve device, and refrigeration cycle system Download PDFInfo
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- CN214406581U CN214406581U CN202120463270.1U CN202120463270U CN214406581U CN 214406581 U CN214406581 U CN 214406581U CN 202120463270 U CN202120463270 U CN 202120463270U CN 214406581 U CN214406581 U CN 214406581U
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- 239000012530 fluid Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 29
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- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
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- 238000004378 air conditioning Methods 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
The utility model relates to a gomphosis structure, the fixed structure and the valve gear and the refrigeration cycle system of screw member. For example, a fitting structure of a screw capable of resistance welding is provided as a welding method for preventing loosening of a screw. In a thermal expansion valve, an adjustment screw mechanism capable of adjusting the compression amount of an adjustment spring (elastic body) is used. The adjusting screw mechanism is composed of an external screw thread part, an internal screw thread part and an adjusting spring of the adjusting screw. The external thread portion and the internal thread portion of the adjusting screw mechanism are in line contact around the central axis over the entire spiral circumference or a part of the spiral. The cross-sectional shapes of the surfaces along the axis of the external thread portion and the internal thread portion are set such that one thread groove has a triangular shape, the other thread ridge has a trapezoidal shape, or both have trapezoidal shapes. The male screw portion and the female screw portion are fixed to each other by resistance welding at a portion where the wires are in contact with each other.
Description
Technical Field
The present invention relates to a fitting structure suitable for a screw for preventing loosening of a screw, a fixing structure of the screw, and a valve device and a refrigeration cycle system using the same.
Background
Conventionally, as a technique for preventing thread loosening, for example, there is a technique disclosed in japanese patent application laid-open No. 2002-181022 (patent document 1). The technique of patent document 1 is a screw loosening prevention structure using welding, and fixes a contact surface between a head of a screw and a fixed member by means of spot welding or laser welding.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2002-181022
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
In the technique as in patent document 1, since the contact area between the screw portion and the fixed member is large, it is difficult to perform resistance welding. In general, in screw fixation by conventional welding, there is a problem that welding is difficult when the screw itself enters the inside of the fixed member, such as a butt screw, in a state where the head of the screw is lifted from the fixed member.
The utility model aims to provide a gomphosis structure of screw member, for example as the welding method of the condition of preventing the screw thread to become flexible, not only can carry out electric spot welding, laser welding, but also can carry out resistance weld.
Means for solving the problems
The utility model discloses a gomphosis structure of screw member is the gomphosis structure of screw member in the screw-threaded mechanism that forms with external screw thread portion and internal thread portion gomphosis, its characterized in that constitutes for above-mentioned external screw thread portion and above-mentioned internal thread portion carry out line contact around the axis at spiral helicine whole week or spiral helicine part around the center.
In this case, the fitting structure of the screw is preferably characterized in that the vertex angle of the ridge or valley of the external thread portion is changed to make a spiral line contact with the vertex angle of the ridge or valley of the internal thread portion.
Preferably, the fitting structure of the screw is characterized in that the cross-sectional shapes of the surfaces of the external thread portion and the internal thread portion along the axis are both triangular.
In the fitting structure of the screw, preferably, the cross-sectional shapes of the surfaces of the male screw portion and the female screw portion along the axis are such that one thread groove has a triangular shape and the other thread ridge has a trapezoidal shape, or both have trapezoidal shapes.
In the fitting structure of the screw, preferably, one of the thread grooves has a rectangular shape and the other of the thread ridges has a triangular shape or a trapezoidal shape in a cross-sectional shape of the surfaces of the male screw portion and the female screw portion along the axis.
The fixing structure of the screw according to the present invention has the fitting structure of the screw, and is characterized in that the external thread portion and the internal thread portion are welded at the portion of the line contact.
The valve device of the present invention is characterized in that the adjusting screw mechanism formed by fitting the external thread portion and the internal thread portion is provided with a fixing structure of the screw, and the external thread portion and the internal thread portion can adjust the compression amount of the adjusting spring in the deformation direction of the adjusting spring.
In this case, the valve body and the valve port are preferably configured as an expansion valve that throttles the refrigerant flowing from the inflow passage, expands the refrigerant, and flows out from the outflow passage.
The utility model discloses a refrigeration cycle system is including compressor, condenser, evaporimeter and throttling arrangement's refrigeration cycle system, its characterized in that uses above-mentioned valve gear as above-mentioned throttling arrangement.
Effect of the utility model
According to the fitting structure of a screw, the fixing structure of a screw, and the valve device and the refrigeration cycle system using the same of the present invention, resistance welding can be easily performed as a welding method for preventing loosening of a screw by bringing the contact portion of the male screw portion and the female screw portion into line contact, and thus the present invention is suitable for preventing loosening of a screw mechanism.
Drawings
Fig. 1 is a partial sectional view of a cooling device including a temperature expansion valve as a valve device according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating the operation and effect of the fitting structure of the screw according to the embodiment.
Fig. 3 is an enlarged cross-sectional view of a main portion of an adjusting screw mechanism in the temperature type expansion valve according to the embodiment.
Fig. 4 is a diagram showing a modification of the adjustment screw according to the embodiment.
Fig. 5 is a diagram showing a refrigeration cycle system according to an embodiment of the present invention.
In the figure:
1-adjusting screw mechanism, 11-female screw portion, 12-male screw portion, 13-adjusting screw, 14-adjusting spring, 2-valve main body, 2A-lower side portion, 2B-upper side portion, 21-side opening, 22-lower end opening, 23-valve guide hole, 24-working shaft guide hole, 25-refrigerant passing portion, 26-spring chamber, 27-pressure equalizing hole, 3-driving actuator, 3A-upper cover, 3B-lower cover, 3C-retaining member, 31-flange portion, 32-pressure equalizing chamber, 28-valve seat portion, 29-valve port, 34-diaphragm, 35-diaphragm chamber, 36-pressure equalizing chamber, 37-pressure plate, 38-working shaft, 38 a-lower end portion, 39-coil spring, 4-valve core, 41-inner space, 42-through hole, 43-needle portion, 5-cylinder, X-axis, 10-temperature type expansion valve, 20-housing, 20A-valve unit fitting hole, 20B-inflow path, 20C-outflow path, 100-compressor, 200-condenser, 300-evaporator, 400-accumulator.
Detailed Description
Hereinafter, embodiments of a screw fitting structure, a screw fixing structure, a valve device, and a refrigeration cycle according to the present invention will be described with reference to the drawings.
Fig. 5 is a diagram showing a main part of a refrigeration cycle of a cooling apparatus using a temperature type expansion valve according to an embodiment, and the refrigeration cycle of the embodiment will be described first. In fig. 5, reference numeral 10 denotes a temperature type expansion valve of the embodiment, reference numeral 100 denotes a compressor, reference numeral 200 denotes a condenser, reference numeral 300 denotes an evaporator, and reference numeral 400 denotes an accumulator, and these are connected in a ring shape by a pipe to constitute a refrigeration cycle. As will be described later, the thermal expansion valve 10 is assembled in a housing 20, and includes a diaphragm-type drive actuator 3, a temperature sensing cylinder 5, for example, the same as a conventional temperature sensing cylinder, and a capillary tube 6. The inflow passage 20B of the casing 20 is connected to an outlet-side pipe 200a of the condenser 200, and the outflow passage 20C of the casing 20 is connected to an inlet-side pipe 300a of the evaporator 300. The evaporator 300 is disposed in parallel in contact with a heating element, not shown, to be cooled, or in an indoor ambient gas to be cooled for air conditioning or refrigeration, and the temperature sensing cylinder 5 is attached to an outlet-side pipe 300b of the evaporator 300.
The compressor 100 compresses the refrigerant flowing through the refrigeration cycle, and the compressed refrigerant is condensed and liquefied by the condenser 200 and flows into the thermal expansion valve 10 through the inflow passage 20B. The refrigerant flowing into the thermal expansion valve 10 is decompressed (expanded) and flows into the evaporator 300 through the outflow passage 20C. The evaporator 300 evaporates and gasifies a part of the refrigerant, the refrigerant in a gas-liquid mixed state flows into the accumulator 400, and the gas-phase refrigerant circulates from the accumulator 400 to the compressor 100. The evaporator 300 evaporates and gasifies a part of the refrigerant to absorb heat from a heat generating body, air, and the like. Thereby, the heat generating body, the air, or the like is cooled. Further, a gas is sealed in the temperature sensing cylinder 5 by adsorption filling or the like, and the temperature sensing cylinder 5 is connected to the driving actuator 3 by a capillary tube 6.
Fig. 1 is a partial sectional view of a cooling device including a temperature type expansion valve as a valve device according to an embodiment, fig. 2 is a view for explaining an operation effect of a screw fitting structure in the embodiment, and fig. 3 is an enlarged sectional view of a main portion of an adjusting screw mechanism in the temperature type expansion valve. Note that the concept of "up and down" in the following description corresponds to up and down in the drawing of fig. 1, and the axis X indicated by the one-dot chain line corresponds to the center line of the valve port 29 described later and to the movement direction of the operating shaft 38 and the valve element 4.
The cooling device of this embodiment is a device in which the temperature-type expansion valve 10 of the embodiment is mounted on the housing 20. The valve housing 20 is entirely made of a metal member, and the valve unit mounting hole 20A, the inflow passage 20B, and the outflow passage 20C are formed in the housing 20. The valve unit attachment hole 20A has: a small diameter chamber 20a1 having a cylindrical shape centered on the axis X below in the direction of the axis X; a cylindrical large diameter chamber 20a2 centered on the axis X above the small diameter chamber 20a 1; and a thin cylindrical drive actuator chamber 20A3 centered on the axis X above the large diameter chamber 20a 2. The thermal expansion valve 10 is fitted into the valve unit mounting hole 20A.
The thermal expansion valve 10 is composed of a valve main body 2, a drive actuator 3, a valve element 4, and a temperature sensing cylinder 5 (see fig. 5). Further, an O-ring P, Q is provided between the valve body 2 and the housing 20, at an end of the small diameter chamber 20a1 on the large diameter chamber 20a2 side and an end of the large diameter chamber 20a2 on the drive actuator chamber 20A3 side, and airtightness between the inflow passage 20B and the outflow passage 20C is ensured by the O-ring P. Further, the O-ring Q ensures airtightness between the valve main body 2 and the housing 20 with respect to the external space.
The valve main body 2 is made of a metal member made of stainless steel, and is housed in the small diameter chamber 20a1 and the large diameter chamber 20a2 of the housing 20. The lower portion 2A of the valve body 2 housed in the small diameter chamber 20a1 is formed in a cylindrical shape having an axial direction along the axis X, and has a side opening 21 on a side surface thereof and a lower end opening 22 at a lower end thereof. A valve guide hole 23 is formed in the upper inner periphery of the lower portion 2A, and the valve body 4 is accommodated in the valve guide hole 23. A female screw portion 11 is formed inside the lower end opening 22 of the lower portion 2A in the axis X direction, and an adjusting screw 13 made of a stainless steel metal member is disposed inside the female screw portion. An external thread portion 12 is formed on the outer periphery of the adjustment screw 13, the external thread portion 12 is screwed with the internal thread portion 11, and an adjustment spring 14 is disposed between the adjustment screw 13 and the valve body 4. The female screw portion 11, the adjusting screw 13, and the adjusting spring 14 constitute the adjusting screw mechanism 1. A through hole 13a and a driver hole 13b are formed in the center of the adjustment screw 13.
The upper portion 2B of the valve main body 2, which is housed in the large diameter chamber 20a2, includes: a cylindrical work shaft guide hole 24 extending in the axis X direction above a valve seat portion 32a described later; a refrigerant passage portion 25 extending orthogonally to the working shaft guide hole 24; a spring chamber 26 formed in an annular deep groove around the working shaft guide hole 24 from the side of the drive actuator chamber 20a 3; and a pressure equalizing hole 27 for communicating the spring chamber 26 with the refrigerant passing portion 25.
The drive actuator 3 formed on the upper portion of the valve main body 2 is formed as an outer case by a thin disc-shaped upper cover 3A and a lower cover 3B. The lower cover 3B includes a flange portion 31 facing the upper cover 3A, and a cylindrical portion 32 connected to the flange portion 31 and having a cylindrical shape centered on the axis X. The lower cover 3B is joined to the valve main body 2 at the cylindrical portion 32 by welding or brazing, and the valve seat portion 28 is disposed on the lower end side of the working shaft guide hole 24 of the upper portion 2B of the valve main body 2. A valve port 29 centered on the axis X is formed in the center of the valve seat portion 28.
Further, the retaining member 3C is attached to the drive actuator chamber 20A3 of the housing 20, and the retaining member 3C is locked to the upper surface of the outer edge portion of the upper cover 3A of the drive actuator 3, so that the drive actuator 3 and the valve body 2 do not fall out of the valve unit attachment hole 20A.
A diaphragm 34 is provided between the upper cover 3A and the lower cover 3B, and a diaphragm chamber 35 and a pressure equalizing chamber 36 are defined by the diaphragm 34. A pressure plate 37 is disposed in the lower cover 3B, and an operating shaft 38 is connected to the pressure plate 37. Further, a coil spring 39 is disposed in the spring chamber 26 in a compressed state between the bottom of the spring chamber 26 and the platen 37. Thereby, the coil spring 39 biases the operating shaft 38 toward the diaphragm 34.
The working shaft 38 is slidably inserted through the working shaft guide hole 24. The lower end 38a of the operating shaft 38 is pin-shaped so as to have an outer diameter capable of passing through the valve port 29, and the lower end 38a of the operating shaft 38 penetrates the valve port 29. The lower end 38a of the operating shaft 38 transmits the operation of the diaphragm 34 to the valve element 4.
The valve body 4 is formed in a bottomed cylindrical shape having a closed upper surface and an open lower surface, and has an inner space 41 inside. Further, a through hole 42 that communicates the valve port 29 with the internal space 41 is formed in a part of the upper surface, and a needle portion 43 is provided in the center of the upper surface. The needle portion 43 is moved toward or away from the valve seat portion 28 to control the opening degree of the valve port 29. The lower end 38a of the operating shaft 38 abuts on the upper end of the needle portion 43.
According to the above configuration, the inflow path 20B receives the refrigerant from the condenser 200, the refrigerant is introduced into the valve unit mounting hole 20A, passes through the side opening 21 of the lower portion 2A, the wrench hole 13B and the through hole 13a of the adjusting screw 13, the inner space 41 and the through hole 42 of the valve body 4, the valve port 29, and the refrigerant passing portion 25 in this order, and is sent out from the outflow path 20C to the evaporator 300. When the internal pressure of the diaphragm chamber 35 increases or decreases in accordance with the temperature sensed by the temperature sensing cylinder 5, the diaphragm 34 deforms, and the diaphragm chamber 35 expands or contracts. Then, the operating shaft 38 moves in the axis X direction in accordance with the deformation of the diaphragm 34, and the valve opening, which is the gap between the valve port 29 and the needle portion 43 of the valve body 4, changes.
In the adjusting screw mechanism 1 of the thermal expansion valve 10, the adjusting spring 14 is provided below the valve element 4 and applies an upward biasing force, and the biasing force with respect to the valve element 4 can be adjusted by adjusting the amount of screwing of the screw 13 into the female screw portion 11. That is, since the force with which the valve body 4 presses the operating shaft 38 can be adjusted by adjusting the amount of screwing the adjusting screw 13, the pressure at which the valve port 29 starts to open, that is, the set pressure can be adjusted according to the introduction pressure of the diaphragm chamber 35. When the adjustment screw 13 is screwed (rotated), a wrench or the like is fitted into the wrench hole 13b of the adjustment screw 13 and rotated.
After the temperature type expansion valve 10 has adjusted the set pressure as described above, the adjustment screw 13 is fastened to the female screw portion 11 of the lower portion 2A of the valve main body 2. The valve main body 2 and the adjustment screw 13 are each a metal member made of stainless steel, and are resistance welded as shown in fig. 2. In resistance welding, a voltage is applied between two members to generate high joule heat at the contact portion, and the contact portion is melted to be welded.
Here, as shown in fig. 2, in this embodiment, the cross-sectional shape of the thread groove (valley) of the female screw portion 11 of the lower portion 2A taken along the axis X is a triangular shape, and the cross-sectional shape of the thread ridge of the male screw portion 12 of the adjusting screw 13 taken along the axis X is a trapezoidal shape. In addition, the crest angle θ 2 of the ridge of the external thread portion 12 is smaller than the crest angle θ 1 of the valley of the thread groove of the internal thread portion 11. Thus, the contact portion with the male screw portion 12 of the adjustment screw 13 is configured to be in spiral line contact around the axis X as indicated by a single-dotted line circle in the drawing in a state where both are screwed together. Then, by performing resistance welding, as shown in fig. 3, a melt-solidified layer D (a portion of an ellipse with thin hatching) is formed at the contact portion. For example, in a conventional screw, a male screw portion and a female screw portion are in surface contact, whereas, as in the present embodiment, the male screw portion 12 and the female screw portion 11 are in line contact, and at the time of resistance welding, the contact resistance at the contact portion is sufficiently larger than that of the conventional one, and resistance welding can be easily performed.
In the embodiment shown in fig. 2, the lower portion 2A of the valve body 2 and the adjustment screw 13 are clamped and pressed in the radial direction (direction perpendicular to the axis X) by resistance welding. Normally, since there is a gap in the radial direction between the external thread portion 12 and the internal thread portion 11, the external thread portion 12 on the side pressed in the radial direction of the valve main body 2 and the internal thread portion 11 are in contact with each other without a gap, and therefore welding is performed, but since there is a gap between the external thread portion 12 and the internal thread portion 11 on the side not pressed (on the opposite side of 180 °), welding is not performed. Therefore, the male screw portion 12 and the female screw portion 11 are in line contact with each other around the central axis X in a part of the spiral shape, and are welded only in a part of the spiral shape. Since a part of the thread-coupled shape remains without being melted and suppresses the deviation in the axis X direction at the time of melting, it is preferable to accurately adjust the compression amount of the adjustment spring 14 (elastic body). The fixing is only partially performed by welding, but depending on the melting conditions, the fixing strength is sufficient even partially.
In the embodiment shown in fig. 2, the lower portion 2A of the valve body 2 and the adjusting screw 13 are radially sandwiched and pressed, but the male screw portion 12 and the female screw portion 11 may be pressed in the axial line X direction instead of the radial direction and brought into line contact around the central axis X over the entire circumference of the spiral shape to be welded. In this case, since the male screw portion 12 and the female screw portion 11 are in contact with each other over the entire circumference of the spiral shape in the axis X direction, the contact resistance at the contact portion is sufficiently larger than that in the conventional resistance welding, and the resistance welding can be easily performed.
In the embodiment of fig. 2, the case where θ 2 is smaller than θ 1 is described, but the similar effect can be obtained also when θ 2 is larger than θ 1 because the linear contact is performed spirally around the axis X. In the embodiment of fig. 2, an example is shown in which the cross section of the thread groove (valley) of the female screw portion is triangular and the cross section of the thread ridge of the male screw portion is trapezoidal, but the present invention is not limited to this, and the same effects can be obtained even in a combination opposite to that of fig. 2, such as a combination in which the cross section of the thread groove (valley) of the female screw portion is trapezoidal and the cross section of the thread ridge of the male screw portion is triangular (the angle is different from the trapezoidal). In addition, the same effect can be obtained even if both the cross section of the thread groove (valley) of the internal thread portion and the cross section of the thread ridge of the external thread portion are trapezoidal shapes having different angles.
In the embodiment of fig. 2, the above-described cross-sectional shape of the thread groove (valley) of the female thread portion 11 of the lower portion 2A is a triangular shape, and the cross-sectional shape of the ridge of the male thread portion 12 is a trapezoidal shape, but the cross-sectional shape of the ridge of the male thread portion may be a rectangular shape instead of a trapezoidal shape. The same effect can be obtained also by a combination of the reverse of the above-described configuration in which the cross-sectional shape of the thread groove (valley) as the female screw portion is a rectangular shape and the cross-sectional shape of the thread ridge of the male screw portion is a triangular shape. Further, the cross-sectional shape of the thread groove (valley) of the female screw portion may be a rectangular shape, and the cross-sectional shape of the ridge of the male screw portion may be a trapezoidal shape, and even an opposite combination in which the cross-sectional shape of the thread groove (valley) of the female screw portion is a trapezoidal shape and the cross-sectional shape of the ridge of the male screw portion is a rectangular shape can obtain the same effect. In this embodiment, the male screw portion 12 and the female screw portion 11 are both made of stainless steel having low thermal conductivity, so that joule heat diffusion can be reduced and resistance welding can be performed more easily.
In each of the embodiments in which the screw to be engaged is trapezoidal or rectangular, the engagement of trapezoidal screws, the engagement of rectangular screws with trapezoidal screws, and the like, the triangular screw as described above has a shape in which the respective ridges of the thread are in contact at two points, and has a space in the radial direction between the crest of the thread and the bottom of the valley of the screw. Further, since the male screw and the female screw have different angles, a gap is formed also in the axis X direction of the screw at the time of fitting, and thus a gap is formed. Accordingly, the melted screw member is accumulated in the void, so that the melt burr can be suppressed, and the melt burr can be prevented from falling off and flowing out as foreign matter into the flow path of the refrigeration cycle, thereby preventing a problem.
Fig. 4 is a diagram showing a modification of the adjusting screw according to the embodiment, in which the cross-sectional shape of the male screw portion 12 ' of the adjusting screw 13 ' is a triangular shape, and the cross-sectional shape of the female screw portion 11 ' is a shape in which the apex angle θ 2 ' of the ridge is smaller than the opposing angle θ 1 ' of the triangular thread groove (valley), and the crest of the ridge of the male screw portion 12 ' is in line contact with the bottom of the thread groove of the female screw portion 11 '. In this modification as well, resistance welding can be easily performed. In the embodiment of fig. 4, the crest portion of the thread and the bottom portion of the thread groove (valley) are shown as acute angles (the portion shown by a single-dot chain line circle in the drawing), but when the bottom portion of the thread groove (valley) is subjected to the circular arc machining, the crest portion of the thread is preferably subjected to the circular arc machining smaller than the circular arc dimension at the bottom portion of the thread groove (valley). This allows the large arc portion and the small arc portion to be reliably in line contact with each other. Further, when the bottom portion of the thread groove (valley) of the internal thread portion 11 is subjected to the arc machining, the top portion of the thread of the external thread portion 12' may not be subjected to the arc machining, and conversely, the top portion of the thread may be subjected to the arc machining without being subjected to the arc machining at the bottom portion of the thread groove (valley), and the same effect is obtained by the line contact. In the embodiment of fig. 4, the case where θ 2 'is smaller than θ 1' is described, and when θ 2 'is larger than θ 1', the same effect is obtained because the linear contact is performed spirally around the axis X. In each of the embodiments in which the triangular screws are fitted to each other, since the angles of the male screw and the female screw are also different, there is a gap in the axis X direction of the screw at the time of fitting, and therefore, there is a gap. Accordingly, the melted screw member is accumulated in the void, so that the melt burr can be suppressed, and the melt burr can be prevented from falling off and flowing out as foreign matter into the flow path of the refrigeration cycle, thereby preventing a problem.
As the shape of the male screw and the female screw of each embodiment, a triangular shape, a trapezoidal shape, and a rectangular shape have been described, and the corner portions of each shape may be angular, but the same effect can be obtained by employing an arc shape.
The present invention is not limited to this embodiment, and includes other configurations and the like that can achieve the object of the present invention, and modifications and the like as described below are also included in the present invention. In the above-described embodiment, the example of the temperature-type expansion valve is shown as the valve device, but the present invention can also be applied to a pressure regulating valve in which a valve port is opened and closed by a diaphragm, and a set pressure is adjusted by adjusting a compression amount of an elastic body such as an adjusting spring, for example. The present invention is not limited to a temperature-type expansion valve and a pressure-regulating valve, and may be applied to other valve devices such as an electromagnetic valve and an electrically-operated valve provided with a mechanism for regulating the compression amount of an elastic body such as a regulating spring. Further, the present invention can be applied to a device such as a switch other than a valve device. In addition, the present invention can also be applied to an adjusting screw mechanism based on the screw coupling of a male screw and a female screw. Further, the fitting structure described above is not necessarily limited to the resistance welding between the metal members as in the above-described embodiments, and may be applied to other joining methods that utilize heat generation of a contact portion such as ultrasonic welding between resin members, for example.
While the embodiments of the present invention have been described in detail with reference to the drawings and other embodiments have been described in detail, specific configurations are not limited to these embodiments, and modifications of design and the like without departing from the scope of the present invention are also included in the present invention.
Claims (9)
1. A fitting structure of a screw in a screw mechanism in which an external thread portion and an internal thread portion are fitted to each other,
the male screw portion and the female screw portion are configured to be in line contact around the central axis over the entire spiral circumference or a part of the spiral.
2. The fitting construction of a screw according to claim 1,
the vertex angle of the ridge or valley of the external thread portion is changed to make a spiral line contact with the vertex angle of the ridge or valley of the internal thread portion.
3. The fitting construction of a screw according to claim 2,
the cross-sectional shapes of the surfaces of the external thread portion and the internal thread portion along the axis are both triangular.
4. The fitting construction of a screw according to claim 2,
in the cross-sectional shapes of the surfaces of the male screw portion and the female screw portion along the axis, one thread groove has a triangular shape, and the other thread ridge has a trapezoidal shape, or both the thread grooves and the thread ridges have trapezoidal shapes.
5. The fitting construction of a screw according to claim 2,
in the cross-sectional shape of the surface of the male screw portion and the female screw portion along the axis, one thread groove has a rectangular shape, and the other thread ridge has a triangular shape or a trapezoidal shape.
6. A screw fixing structure having the screw fitting structure according to any one of claims 1 to 5,
the above-described fixing construction of the screw is characterized in that,
the external thread portion and the internal thread portion are welded at a portion where the thread contacts.
7. A valve device is configured to control the opening degree of a valve port through which a fluid flows by a valve body and to transmit a driving force for driving an actuator to the valve body,
the above-mentioned valve device is characterized in that,
the adjusting screw mechanism in which the male screw portion and the female screw portion are fitted to each other is provided with the fixing structure of the screw according to claim 6, and the male screw portion and the female screw portion are capable of adjusting the compression amount of the adjusting spring in the deformation direction of the adjusting spring.
8. The valve device according to claim 7,
the valve body and the valve port are configured as an expansion valve that throttles the refrigerant flowing in from the inflow passage, expands the refrigerant, and flows out from the outflow passage.
9. A refrigeration cycle system comprises a compressor, a condenser, an evaporator and a throttling device, and is characterized in that,
use of the valve device according to claim 8 as the above-mentioned throttling means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020047606A JP7303143B2 (en) | 2020-03-18 | 2020-03-18 | Screw fixation structure, valve device, and refrigeration cycle system |
| JP2020-047606 | 2020-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214406581U true CN214406581U (en) | 2021-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120463270.1U Active CN214406581U (en) | 2020-03-18 | 2021-03-03 | Screw fitting structure, screw fixing structure, valve device, and refrigeration cycle system |
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| Country | Link |
|---|---|
| JP (1) | JP7303143B2 (en) |
| CN (1) | CN214406581U (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4832897B1 (en) * | 1968-06-05 | 1973-10-09 | ||
| JPS56101472A (en) * | 1980-01-19 | 1981-08-14 | Saginomiya Seisakusho Inc | Expansion valve |
| JPH0311449Y2 (en) * | 1985-03-22 | 1991-03-19 | ||
| JPH05256538A (en) * | 1992-03-10 | 1993-10-05 | Mitsubishi Heavy Ind Ltd | Throttling device for refrigeration cycle |
| JP3200260B2 (en) * | 1993-10-08 | 2001-08-20 | 三菱鉛筆株式会社 | Screw structure of trapezoidal screw |
| JP3977496B2 (en) * | 1997-10-15 | 2007-09-19 | 株式会社スズキ螺子製作所 | Male thread, and screwed structure of male thread and female thread |
| JP2009228833A (en) * | 2008-03-24 | 2009-10-08 | Toyota Motor Corp | Screw looseness preventive structure |
| JP5501670B2 (en) * | 2009-06-23 | 2014-05-28 | 株式会社不二工機 | Diaphragm type fluid control valve |
| JP5465093B2 (en) * | 2010-06-04 | 2014-04-09 | 株式会社降矢技研 | Loosening prevention screw |
| US10197086B2 (en) * | 2015-07-31 | 2019-02-05 | Infastech Intellectual Properties Pte. Ltd | Threaded fastener |
| JP6636990B2 (en) * | 2017-06-01 | 2020-01-29 | 株式会社鷺宮製作所 | Restrictor and refrigeration cycle system |
-
2020
- 2020-03-18 JP JP2020047606A patent/JP7303143B2/en active Active
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2021
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| Publication number | Publication date |
|---|---|
| JP2021148184A (en) | 2021-09-27 |
| JP7303143B2 (en) | 2023-07-04 |
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