JP2021148151A - Fixing structure of adjustment screw mechanism, valve device and refrigeration cycle system - Google Patents

Abstract

To reduce weight and to shorten a processing time, in a temperature-type expansion valve using a fixing structure of an adjustment screw mechanism for adjusting a compression amount of an adjustment spring by a screw mechanism which is composed of a male screw part and a female screw part.SOLUTION: In a temperature-type expansion valve 10, there is employed an adjustment screw mechanism 1 which can adjust a compression amount of an adjustment spring 14 (elastic body). The adjustment screw mechanism 1 is constituted of a male screw part 12 and a female screw part 11 of an adjustment screw 13, and the adjustment spring 14. The male screw part 12 and the female screw part 11 of the adjustment screw mechanism 1 are constituted of resin members. The male screw part 12 and the female screw part 11 are fixed to each other by ultrasonic welding in an interface of screwing portions of the screw parts.SELECTED DRAWING: Figure 1

Description

The present invention has a fixed structure of an adjusting screw mechanism that adjusts the amount of compression of an elastic body by a screw mechanism consisting of a male screw portion and a female screw portion that are mutually adjustable in the deformation direction of the elastic body, a valve device, and a refrigeration cycle system. Regarding.

Conventionally, in a valve device, a technique for adjusting the operating characteristics of a valve body (valve member) by an adjusting screw mechanism for adjusting the amount of compression of an elastic body incorporated inside the valve is described in, for example, Japanese Patent Application Laid-Open No. 2014-5906 (Patent). It is disclosed in Document 1). In Patent Document 1, the coil spring (compression spring) is an elastic body.

Japanese Patent Application Laid-Open No. 2014-5906 Public Relations

As the fixing structure of the adjusting screw mechanism in Patent Document 1, a fixing structure by caulking metal to metal, a fixing structure by applying an adhesive to a screw portion, or the like is used.

However, in the fixed structure by caulking, it is difficult to use a resin member for the screw mechanism, and it is necessary to use a metal member, which limits the weight reduction of the valve device. Further, in the fixed structure using an adhesive, there is a problem that it takes time for the adhesive to dry and the processing time becomes long.

An object of the present invention is to reduce the weight and shorten the machining time in a valve device using a fixed structure of an adjusting screw mechanism that adjusts the amount of compression of an elastic body by a screw mechanism consisting of a male threaded portion and a female threaded portion. do.

The fixing structure of the adjusting screw mechanism of the present invention is a fixing structure of the adjusting screw mechanism that adjusts the amount of compression of the elastic body by a screw mechanism consisting of a male screw portion and a female screw portion that are mutually adjustable in the deformation direction of the elastic body. The male-threaded portion and the female-threaded portion of the adjusting screw mechanism are made of a resin member, and the male-threaded portion and the female-threaded portion are fixed to each other by welding at the interface of the screwed portion. ..

At this time, a fixing structure of the adjusting screw mechanism is preferable, wherein the male screw portion and the female screw portion are fixed to each other by welding only at a part of the interface of the screwed portion.

Further, in the screwed state between the male screw portion and the female screw portion, the total of the radial gap of the female screw root bottom and the radial gap of the male screw valley bottom is 20% or more of the difference between the female screw valley bottom diameter and the male screw valley bottom diameter. A fixed structure of the characteristic adjusting screw mechanism is preferable.

Further, the adjusting screw mechanism has a fixed structure of the adjusting screw mechanism, which is configured to adjust the amount of compression of the elastic body that generates a load in a direction opposite to the load direction generated by the drive actuator. preferable.

The valve device of the present invention is a valve device having a structure for controlling the opening degree of a valve port through which a fluid flows by a valve body and having a fixed structure of the adjusting screw mechanism, and controls the driving force of the drive actuator. It is characterized in that it is configured to transmit to the valve body.

At this time, a valve device characterized in that the valve body and the valve port are configured as an expansion valve that squeezes the refrigerant flowing in from the inflow passage to expand the refrigerant from the outflow passage and causes the refrigerant to flow out is preferable.

The refrigeration cycle system of the present invention is a refrigeration cycle system including a compressor, a condenser, an evaporator, and a throttle device, and the valve device is used as the throttle device. ..

According to the fixing structure of the adjusting screw mechanism, the valve device, and the refrigeration cycle system of the present invention, the male and female threads of the adjusting screw mechanism are composed of a resin member, and the male and female threads are ultrasonically welded. Since it is fixed by, the weight can be reduced and the processing time can be shortened.

It is a partial sectional view of the cooling device provided with the temperature type expansion valve as the valve device of embodiment of this invention. It is an enlarged sectional view of the main part of the adjustment screw mechanism in the temperature type expansion valve of an embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of a modified example 1 of an adjusting screw according to an embodiment. It is the schematic which shows the process of ultrasonic welding in an embodiment. It is a figure which shows the modification 2 of the adjustment screw in embodiment. It is a figure which shows the refrigeration cycle system of embodiment of this invention.

Next, the fixing structure of the adjusting screw, the valve device, and the embodiment of the refrigeration cycle system of the present invention will be described with reference to the drawings.

FIG. 6 is a diagram showing a main part of the refrigeration cycle system of the cooling device using the temperature type expansion valve of the embodiment, and first, the refrigeration cycle system of the embodiment will be described. In FIG. 6, 10 is a temperature expansion valve of the embodiment, 100 is a compressor, 200 is a condenser, 300 is an evaporator, and 400 is an accumulator, which are connected in a ring shape by piping to form a refrigeration cycle system. doing. As will be described later, the temperature expansion valve 10 is mounted in the housing 20 and has a diaphragm type drive actuator 3, a temperature sensing cylinder 5 similar to a conventional temperature sensing cylinder, and a capillary tube 6. The inflow passage 20B of the housing 20 is connected to the outlet side pipe 200a of the condenser 200, and the outflow passage 20C of the housing 20 is connected to the inlet side pipe 300a of the evaporator 300. The evaporator 300 is placed in contact with a heating element (not shown) to be cooled, or is arranged in an indoor atmosphere for cooling for air conditioning and refrigeration. It is installed.

The compressor 100 compresses the refrigerant flowing through the refrigeration cycle system, and the compressed refrigerant is condensed and liquefied by the condenser 200 and flows into the temperature expansion valve 10 through the inflow passage 20B. The temperature type expansion valve 10 decompresses (expands) the inflowing refrigerant and causes it to flow into the evaporator 300 from the outflow passage 20C. The evaporator 300 evaporates and vaporizes a part of the refrigerant, the refrigerant in the gas-liquid mixed state flows into the accumulator 400, and the vapor phase refrigerant is circulated from the accumulator 400 to the compressor 100. Then, the evaporator 300 absorbs heat from a heating element, air, or the like by evaporating and vaporizing a part of the refrigerant. As a result, the heating element, air, etc. are cooled. Further, the temperature sensitive cylinder 5 is filled with gas by adsorption charge or the like, and the temperature sensitive cylinder 5 is connected to the drive actuator 3 by a capillary tube 6.

FIG. 1 is a partial cross-sectional view of a cooling device provided with a temperature-type expansion valve as a valve device of the embodiment, and FIG. 2 is an enlarged cross-sectional view of a main part of an adjusting screw mechanism in the same temperature-type expansion valve. The concept of "upper and lower" in the following description corresponds to the upper and lower parts in the drawing of FIG. 1, and the axis X indicated by the alternate long and short dash line is the center line of the valve port 33 described later, and the operating shaft 38 and the valve body 4 Corresponds to the moving direction of.

In the cooling device of this embodiment, 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 mounting hole 20A has a large diameter of a columnar small diameter chamber 20A1 centered on the axis X below the axis X direction and a columnar large diameter chamber 20A2 centered on the axis X above the small diameter chamber 20A1. Above the chamber 20A2, there is a thin cylindrical drive actuator chamber 20A3 centered on the axis X. Then, the temperature type expansion valve 10 is fitted in the valve unit mounting hole 20A.

The temperature type expansion valve 10 is composed of a valve body 2, a drive actuator 3, a valve body 4, and a temperature sensitive cylinder 5 (see FIG. 6). Between the valve body 2 and the housing 20, O-rings P and Q are provided between the end of the small diameter chamber 20A1 on the large diameter chamber 20A2 side and the end of the large diameter chamber 20A2 on the drive actuator chamber 20A3 side. Is provided, and the airtightness between the inflow passage 20B and the outflow passage 20C is maintained by the O-ring P. Further, the O-ring Q keeps the valve body 2 and the housing 20 airtight with respect to the external space.

The valve body 2 is made of a resin member and is housed in a small diameter chamber 20A1 and a 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 with the axis X direction as the axial direction, and has a side opening 21 on the side surface thereof and a lower end opening 22 on the lower end. ing. A valve guide hole 23 is formed in the upper inner circumference of the lower portion 2A, and the valve body 4 is housed 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 resin member is arranged inside the female screw portion 11. A male screw portion 12 is formed on the outer circumference of the adjusting screw 13, and the male screw portion 12 is screwed into the female screw portion 11 and an adjusting spring as an “elastic body” is formed between the adjusting screw 13 and the valve body 4. 14 is arranged. 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 wrench hole 13b are formed at the center of the adjusting screw 13.

Further, the upper portion 2B of the valve body 2 accommodated in the large diameter chamber 20A2 has a cylindrical operating shaft guide hole 24 extending along the axis X direction above the valve seat portion 32a, which will be described later, and an operating shaft guide hole. The refrigerant passage portion 25 extending orthogonal to the 24, the spring chamber 26 formed as a ring-shaped deep groove around the operating shaft guide hole 24 from the drive actuator chamber 20A3 side, and the spring chamber 26 and the refrigerant passage portion 25 are communicated with each other. It has a pressure equalizing hole 27 and a pressure equalizing hole 27.

The drive actuator 3 configured on the upper part of the valve body 2 constitutes a case body by a thin disk-shaped upper lid 3A and a lower lid 3B. The lower lid 3B has a flange portion 31 facing the upper lid 3A, and a cylindrical portion 32 connected to the flange portion 31 and having a bottomed cylindrical shape centered on the axis X. Further, the lower lid 3B is integrally formed with the valve body 2 by inserting the valve body 2 with the cylindrical portion 32 inside the valve body 2, and the valve seat portion 32a forming the bottom of the cylindrical portion 32 is the valve body. It is arranged on the lower end side of the operating shaft guide hole 24 of the upper portion 2B of 2. A valve port 33 centered on the axis X is formed in the center of the valve seat portion 32a.

A retaining member 3C is attached to the drive actuator chamber 20A3 of the housing 20, and the upper surface of the outer edge portion of the upper lid 3A of the drive actuator 3 is locked by the retaining member 3C to lock the drive actuator 3 and the valve. The main body 2 is prevented from falling out of the valve unit mounting hole 20A.

Further, a diaphragm 34 is provided between the upper lid 3A and the lower lid 3B, and the diaphragm chamber 35 and the pressure equalizing chamber 36 are partitioned by the diaphragm 34. A deposit 37 is arranged in the lower lid 3B, and an operating shaft 38 is connected to the deposit 37. In the spring chamber 26, a coil spring 39 is arranged in a compressed state between the bottom of the spring chamber 26 and the metal fitting 37. As a result, the coil spring 39 urges the operating shaft 38 toward the diaphragm 34.

The operating shaft 38 is slidably inserted into the operating shaft guide hole 24. Further, the lower end portion 38a of the operating shaft 38 has a pin shape so as to have an outer diameter that allows the valve port 33 to pass through, and the lower end portion 38a of the operating shaft 38 penetrates the valve port 33. Then, the lower end portion 38a of the operating shaft 38 transmits the operation of the diaphragm 34 to the valve body 4.

The valve body 4 is formed in a bottomed tubular shape with the upper surface closed and the lower surface open, and has an inner space 41 inside. Further, a through hole 42 for communicating the valve port 33 and the inner 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. Then, the opening degree of the valve port 33 is controlled by the needle portion 43 approaching or separating from the valve seat portion 32a. Further, the lower end portion 38a of the operating shaft 38 is in contact with the upper end portion of the needle portion 43.

With the above configuration, the inflow passage 20B receives the refrigerant from the condenser 200, and after the refrigerant is introduced into the 20A, the side opening 21 of the lower portion 2A and the wrench hole 13b and the through hole 13a of the adjusting screw 13 It passes through the inner space 41 of the valve body 4, the through hole 42, the valve port 33, and the refrigerant passing portion 25 in this order, and is sent out from the outflow passage 20C to the evaporator 300. Further, when the internal pressure of the diaphragm chamber 35 rises or falls according to the sensed temperature of the temperature sensing cylinder 5, the diaphragm 34 is deformed so that the diaphragm chamber 35 expands or contracts. Then, with the deformation of the diaphragm 34, the operating shaft 38 moves in the axis X direction, and the gap between the valve port 33 and the needle portion 43 of the valve body 4, that is, the valve opening degree changes.

Then, in the adjusting screw mechanism 1 of the temperature type expansion valve 10, the adjusting spring 14 is provided downward with respect to the valve body 4 to apply an upward urging force, and the adjusting screw with respect to the female screw portion 11 is provided. The urging force with respect to the valve body 4 can be adjusted by the screwing amount of 13. That is, by adjusting the screwing amount of the adjusting screw 13, the force with which the valve body 4 presses the operating shaft 38 can be adjusted, so that the pressure at which the valve port 33 starts to open according to the introduction pressure of the diaphragm chamber 35, That is, the set pressure can be adjusted. When screwing (rotating) the adjusting screw 13, a wrench or the like is fitted into the wrench hole 13b of the adjusting screw 13 and rotated.

In the temperature type expansion valve 10, after adjusting the set pressure as described above, the adjusting screw 13 is fixed to the female thread portion 11 of the lower portion 2A of the valve body 2. The valve body 2 and the adjusting screw 13 are resin members (resin parts), respectively, and are ultrasonically welded as shown in FIG. In addition, ultrasonic welding means that the interface between the male threaded portion and the female threaded portion is melted and adhered by ultrasonic vibration.

That is, in FIG. 2, a melt-solidified layer D (an elliptical fine hatched portion) is formed at a boundary portion between the female screw portion 11 of the lower portion 2A and the male screw portion 12 of the adjusting screw 13. FIG. 4 is a schematic view showing the process of ultrasonic welding, in which the temperature expansion valve 10 is attached to the fixing jig 40 provided with the rod shaft 40a. Specifically, the rod shaft 40a was inserted into the wrench hole 13b and the through hole 13a of the adjusting screw 13, and the outer peripheral edges of the upper lid 3A and the lower lid 3B of the drive actuator 3 were lifted from the horizontal base 40b of the fixing jig 40. Place in the state. Then, the horn 50 is pressed against the lower portion 2A of the valve body 20 to be ultrasonically welded.

Since the horn 50 is pressed against the outer periphery of the lower portion 2A of the valve body 2 from a direction perpendicular to the axis X (central axis), the interface between the male and female threads on the pressed side of the lower portion 2A is due to ultrasonic vibration. Although it is melted and bonded, on the opposite side where the horn 50 is not pressed, there is a gap between the male threaded portion and the female threaded portion due to the backlash of the screw and there is a non-contact portion, so that there is a portion that is not welded. Further, since the horn 50 is placed in a state of being floated from the horizontal base 40b as shown in FIG. 4, the side on which the horn 50 is pressed is melted by melting in the direction perpendicular to the axis X (central axis), and the valve main body. Since 2 moves downward, a gap is further opened between the screws on the opposite side where the horn 50 is not pressed, and welding is difficult. Therefore, the male-threaded portion and the female-threaded portion are fixed to each other by welding only partially with respect to the entire circumference of the interface of the screwed portions. Since a part of the screwed portion remains without being melted, the deviation in the axis X direction at the time of melting is suppressed, which is preferable when adjusting the compression amount of the elastic body with high accuracy. Only a part of it is fixed by welding, but even a part of it has sufficient fixing strength depending on the melting conditions.

Further, in this embodiment, as shown in FIG. 2, a defective portion is formed in a part of the outer peripheral portion (the portion corresponding to the ridgeline of the spiral) of the male screw portion 12 of the adjusting screw 13. That is, the height of the thread of one of the male threaded portion 12 and the female threaded portion 11 (male threaded portion 12) is smaller than the depth of the thread groove of the other (female threaded portion 11). From this, a gap S1 as a "melt pool" is formed between the ridge of the male screw portion 12 and the valley of the female screw portion 11. As a result, since the molten resin at the time of ultrasonic welding does not protrude into the flow path or the like, it is possible to prevent the protruding portion from coming off and flowing out as foreign matter into the flow path of the refrigeration cycle system, resulting in a problem.

Further, in the embodiment of FIG. 2, an example is shown in which the height of the thread of one of the male threaded portion 12 and the female threaded portion 11 (male threaded portion 12) is smaller than the depth of the thread groove of the other (female threaded portion 11). A modified example 1 of FIG. 3 will be described, which includes not only small ones but also cases of the same dimensions. As shown in FIG. 3, in the state before melting, the difference [A] (radial gap at the bottom of the female thread valley) between the diameter of the female thread valley [D1] and the top diameter (outer diameter) [D2] of the male screw thread, The total (A + B) of the difference [B] (radial gap at the bottom of the male screw valley) between the inner diameter of the female screw [D3] and the diameter of the male screw valley [D4] is the diameter of the female screw valley [D1] and the diameter of the male screw valley [D1]. 20% or more of the difference [C] (diameter length between male and female threads) of D4],
That is,
A = D1-D2
B = D3-D4
At C = D1-D4, (A + B) / C × 100 ≧ 20
By doing so, the gap S1 in the gap [A] and the gap S3 in the gap [B] are sufficiently formed as a “melt pool”. As a result, since the molten resin at the time of ultrasonic welding does not protrude into the flow path or the like, it is possible to prevent the protruding portion from coming off and flowing out as foreign matter into the flow path of the refrigeration cycle system, resulting in a problem.

Further, the difference [A] (radial gap at the bottom of the female screw valley) between the diameter of the female screw valley [D1] and the top diameter (outer diameter) [D2] of the male screw thread, and the inner diameter [D3] of the female screw and the male screw valley. The total (A + B) of the difference [B] (radial gap at the bottom of the male screw valley) of the diameter [D4] is the difference [C] (male screw and female screw) between the diameter of the female screw valley [D1] and the diameter of the male screw valley [D4]. It is preferably 30 to 40% of the length in the radial direction of the valley bottom), which is more desirable because it can secure a gap that allows the molten resin to escape more sufficiently than the above. Further, it is more desirable to set it to about 50%.

FIG. 5 is a diagram showing a modified example 2 of the adjusting screw in the embodiment, and the adjusting screw 13'of the modified example 2 is screwed with the female screw portion 11 at both outer ends of the male screw portion 12'in the axis X direction. A non-defective portion is provided, and in this defective portion, a gap S2 as a “melt pool” is provided between the defective portion of the ridge of the male threaded portion 12 ′ and the valley of the female threaded portion 11. As a result, since the molten resin G at the time of ultrasonic welding does not protrude into the flow path or the like, it is possible to prevent the protruding portion from coming off and flowing out as foreign matter into the flow path of the refrigeration cycle system, resulting in a problem.

Although the temperature type expansion valve as a valve device has been described above, the present invention is not limited to this embodiment, and includes other configurations that can achieve the object of the present invention, and is modified as shown below. Etc. are also included in the present invention. In the above embodiment, an example of a temperature type expansion valve is shown as a valve device, but it can be applied to a valve device provided with an adjusting screw mechanism by screwing a male screw and a female screw. For example, as in Patent Document 1, it may be applied to a pressure adjusting valve that adjusts the set pressure by adjusting the amount of deformation of the coil spring. Further, the present invention is not limited to the temperature type expansion valve and the pressure adjusting valve, and may be applied to other valve devices such as an electromagnetic valve and an electric valve provided with a mechanism for adjusting the amount of deformation of an elastic body such as an adjusting spring. Further, it may be applied to equipment other than the valve device.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings, and other embodiments have also been described in detail. However, the specific configuration is not limited to these embodiments, and the present invention is not limited to these embodiments. Even if there is a design change or the like within a range that does not deviate from the gist, it is included in the present invention.

1 Adjusting screw mechanism 11 Female thread 12 Male thread 13 Adjusting screw 14 Adjusting spring 2 Valve body 2A Lower part 2B Upper part 21 Side opening 22 Lower end opening 23 Valve guide hole 24 Actuating shaft guide hole 25 Coolant passing part 26 Spring chamber 27 Pressure equalizing hole 3 Drive actuator 3A Upper lid 3B Lower lid 3C Retaining member 31 Flange part 32 Cylindrical part 32a Valve seat part 33 Valve port 34 Diaphragm 35 Diaphragm chamber 36 Pressure equalizing chamber 37 Seat 38 Operating shaft 38a Lower end 39 Coil spring 4 Valve body 41 Inner space 42 Through hole 43 Needle part 5 Temperature sensitive cylinder X Axis line 10 Temperature type expansion valve 20 Housing 20A Valve unit mounting hole 20B Inflow passage 20C Outflow passage 100 Compressor 200 Condenser 300 Evaporator 400 Accumulator

Claims (7)

It is a fixed structure of an adjusting screw mechanism that adjusts the amount of compression of an elastic body by a screw mechanism consisting of a male threaded portion and a female threaded portion that are mutually adjustable in the deformation direction of the elastic body.
The adjusting screw is characterized in that the male-threaded portion and the female-threaded portion of the adjusting screw mechanism are formed of a resin member, and the male-threaded portion and the female-threaded portion are fixed to each other by welding at the interface of the screwed portion. Fixed structure of the mechanism. The fixing structure of the adjusting screw mechanism according to claim 1, wherein the male screw portion and the female screw portion are fixed to each other by welding only at a part of the interface of the screwed portion. In the screwed state between the male screw portion and the female screw portion, the total of the radial gap of the female screw root bottom and the radial gap of the male screw valley bottom is 20% or more of the difference between the female screw valley bottom diameter and the male screw valley bottom diameter. The fixing structure of the adjusting screw mechanism according to claim 1 or 2. Any one of claims 1 to 3, wherein the adjusting screw mechanism is configured to adjust the amount of compression of the elastic body that generates a load in a direction opposite to the load direction generated by the drive actuator. Fixed structure of the adjusting screw mechanism described in the section. A valve device configured to control the opening degree of a valve port through which a fluid flows by a valve body and having a fixed structure of the adjusting screw mechanism according to claim 4, wherein the driving force of the driving actuator is applied to the valve body. A valve device characterized in that it is configured to transmit. The valve device according to claim 5, wherein the valve body and the valve port are configured as an expansion valve that narrows down the refrigerant flowing in from the inflow passage and expands and outflows the refrigerant from the outflow passage. A refrigeration cycle system including a compressor, a condenser, an evaporator, and a squeezing device, wherein the valve device according to claim 6 is used as the squeezing device. ..

Images