JP3672814B2 - Valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device such as a closing valve or an on-off valve mainly interposed in a refrigerant piping system of a refrigerator or an air conditioner, and in particular, a seal structure at an open operation position in which a passage in a valve housing is opened by a valve rod. Related to improvement.
[0002]
[Prior art]
Conventionally, as disclosed in Japanese Utility Model Publication No. 4-1427 and as shown in FIG. 7, an inward caulking cylinder portion T is provided continuously with the valve rod receiving cylinder R of the valve casing B, and is continuous with the valve hole H. An annular groove M having a predetermined depth is provided on the inner surface of the bending start end, and the upper end F of the valve end V at the open operation position is pressed against the downward corner E of the annular groove M to assist the sealing by the O-ring O. Thus, a seal structure is known in which the airtightness of the internal passage P is maintained. Incidentally, C is a screw fitting type valve lid, and this valve lid C further supplements the sealing performance.
[0003]
[Problems to be solved by the invention]
However, in the above, it is difficult to press the downward corner portion E of the annular groove M and the operation end side upper surface F of the valve rod V annularly and evenly, and the inner surface of the bending start end of the crimping tube portion T is difficult. Since the annular groove M having a predetermined depth is provided, the breaking torque at the opening operation position where the valve rod V is pulled up is weak, the structure is complicated and the cost is high, but it is difficult to obtain a sufficient sealing effect to withstand actual use. There is a problem that has not yet been put into practical use. Therefore, the subject of this invention is providing the valve apparatus which can obtain the favorable sealing performance which can fully endure actual use at low cost by devising the contact structure by the side of the operation end of a valve stem.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 receives the valve stem 3 in the valve hole 2 provided in the valve casing 1 as shown in FIGS. 4 is provided, and a valve device that opens and closes the internal passage 5 by advancing and retreating as the valve rod 3 rotates is provided with a predetermined thickness d between the inner and outer surfaces of the caulking tube portion 4 and the caulking tube portion. The inner diameter before crimping 4 is made larger than the inner diameter of the valve hole 2 so that the bending start end inner surface s of the crimping cylinder part is positioned radially outward from the inner surface of the valve hole and after the crimping of the crimping cylinder part The inner surface e of the bending end is positioned radially inward of the inner surface of the valve hole, and the inner surface of the caulking tube portion 4 is inclined to the inner surface of the bend, and the valve rod 3 is opened at the position where the valve rod 3 is opened. the operating end side annular portion 6 and the contact portion 7 for pressing provided with the bending of the caulking tube portion 4 The valve rod receiving tube 11 of the valve housing 1 continuous with the end, the caulking tube portion 4 of the wall thick-walled portion 8 than the thickness provided for a predetermined length.
[0006]
The invention according to claim 2 clearly shows in FIGS. 3 and 4 in order to improve the durability by reducing the shape change of the pressure contact portion 7 due to the biting or the like due to the repeated opening and closing operation of the valve stem 3. In addition, a radius 60 that is in frictional contact with the pressure contact portion 7 is provided on the operation end side annular portion 6 of the valve stem 3.
[0008]
[Effects of the invention]
In the first aspect of the invention, as clearly shown in FIGS. 2 and 3, a predetermined thickness d is secured between the inner and outer surfaces of the caulking tube portion 4, and the bending start end inner surface s of the caulking tube portion 4 is formed in the valve hole. Since the inner end e of the bending tube portion 4 is positioned radially inward from the inner surface of the valve hole 2, the buckling point during crimping is stabilized. In addition, the breaking strength of the caulking tube portion 4 when the valve stem 3 is set to the open operation position can be improved. Moreover, the shape and angle of the inner surface of the crimping tube portion 4 in the vicinity of the pressure contact portion 7 can be stabilized, and there is no wrinkles or undulations on the inner surface, so that the sealing performance can be improved. For this reason, although it is cheap, sufficient sealing performance in actual use can be obtained. In addition, a valve lid for supplementing the sealing performance that has been conventionally required can be eliminated.
[0009]
Moreover , as clearly shown in FIGS. 2 and 3, a thick portion 8 thicker than the wall thickness d of the caulking tube portion 4 is provided on the valve rod receiving tube 11 of the valve housing 1 that is continuous with the bending start end of the caulking tube portion 4. Since the caulking tube portion 4 has a predetermined thickness d, the bending start end of the caulking tube portion 4 is a valve hole in a portion where the caulking tube portion 4 and the thick wall portion 8 having a predetermined length on the valve housing 1 side are continuous. 2 is located radially outward from the inner surface of 2 and can further improve the breaking strength of the caulking tube portion 4, and can further stabilize the shape and angle of the press contact portion 7.
[0010]
In the second aspect of the invention, as clearly shown in FIGS. 3 and 4, the operation end side annular portion 6 of the valve stem 3 is provided with the round 60 which is in frictional contact with the pressure contact portion 7. On the other hand, it is possible to reduce the change in shape of the pressure contact portion 7 due to the biting of the valve stem 3 or the like, and the durability can be improved. Furthermore, since the caulking process is performed mechanically, the inclination angle of the axial line of the valve stem 3 and the pressure contact portion 7 may be uneven in the circumferential direction. Therefore, as compared with the case where the edge is used, since it slides and adapts somewhat while frictionally contacting the pressure contact portion 7 along the radius 60, it is possible to secure a good sealing performance without requiring excessive valve rod pulling torque.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a one-side closing valve in a refrigerant circuit. The valve housing 1 includes a valve rod receiving cylinder 11, a base portion 12, an external pipe joint 13, and a service port portion 14, and a primary side passage 51 and a secondary side are provided therein. A refrigerant passage 5 is formed by intersecting the passage 52 with the valve seat 53 therebetween. The orifice diameter of the valve seat 53 is about 8 mm, for example. The material is brass. A valve rod 3 is received in the valve hole 2 inside the valve rod receiving cylinder 11, and a caulking cylinder portion 4 is provided integrally with the valve rod receiving cylinder 11 on the open side of the valve hole 2.
[0013]
As shown in FIG. 2, the valve stem 3 has, from its tip, a truncated cone-shaped valve head 31, a threaded cylindrical portion 32 having a screw 30 on the outer periphery, a cylindrical portion 33 of muk, and a lower collar portion interposing an O-ring 20. 34, an annular groove 35, an upper flange portion 36, an operation end-side annular portion 6 at the upper edge of the upper flange portion, a protruding portion 9 that fills an open space on the open side of the valve hole 2 at the opening operation position of the valve rod 3, An operation unit 90 including an inner hexagonal wrench hole is integrally provided. The material is also made of brass.
[0014]
The screw 30 on the valve stem 3 side is screwed with the screw 10 on the valve housing 1 side, and the valve stem 3 is advanced and retracted in the valve hole 2 by rotating the operation portion 90 with a wrench, and the valve seat 53 is The passage 5 is closed by closing the head 31, and the passage 5 is opened by separating the valve head 31 from the valve seat 53. FIG. 1 shows an opening operation position in which the passage 5 is opened.
[0015]
In FIG. 1, a connecting pipe 54 made of a copper pipe or the like connected to the compressor side is inserted into the base 12 and joined by a brazing part 55. A flanged hemispherical closure 56 that closes the opening of the passage 5 when the pipe is not connected is fixed to the external pipe joint 13 with a flare nut 57. A valve core 58 is attached to the service port portion 14 and a protective nut 59 is covered.
[0016]
As shown in FIG. 2, the thickness d between the inner and outer surfaces of the crimping cylinder portion 4 is secured to a predetermined thickness, for example, about 1.6 mm. Usually, there are many about 1.2 mm, but in this case, it is secured a little thicker. Further, the inner diameter of the caulking cylinder portion 4 is increased to, for example, about 11.4 mm with respect to the inner diameter of 11 mm of the valve hole 2, and an annular nose 40 of about 0.2 mm is provided on the inner surface side of the caulking cylinder portion 4. In this way, the bending start end inner surface s of the caulking cylinder portion 4 is positioned radially outward from the inner surface of the valve hole 2.
[0017]
Further, the valve rod receiving cylinder 11 that is continuous with the bending start end of the crimping cylinder part 4 is provided with a thick part 8 of about 2.5 mm, for example, about 7 mm thicker than the thickness of the crimping cylinder part 4. ing. At the time of caulking, the riveting machine W having the jig U having a radius of about 3 mm is pressed while being rotated.
[0018]
As shown in FIG. 3, after crimping, the outer surface of the crimping cylinder portion 4 has a radius that is the same as that of the jig U of the riveting machine W, and the inner surface has a slight radius that tilts to about 60 degrees. The bending end inner surface e of the caulking tube portion 4 is located radially inward from the inner surface of the valve hole 2. A pressure contact portion 7 is provided on the inner surface connecting the bending start end and the end end of the crimping cylinder portion 4 so as to be in pressure contact with the operation end side annular portion 6 of the valve rod 3 at the opening operation position of the valve rod 3. On the other hand, the operation end side annular portion 6 of the valve stem 3 is provided with a radius 60 having a radius of about 0.5 mm, for example, in frictional contact with the pressure contact portion 7.
[0019]
In addition, although the breaking strength of the caulking tube portion 4 is 15 Nm or more, for safety, before the caulking tube portion 4 breaks, the screws 30 and 10 are screwed or the hexagonal wrench holes of the operation unit 90 before breaking. Has a structure that collapses first.
[0020]
As shown in FIG. 4, the radius 60 provided in the operation end side annular portion 6 of the valve stem 3 may be provided continuously with the upper end of the truncated cone-shaped upper collar portion 360. 1 to 3 are provided with a round 60 at the upper end of the cylindrical upper collar 36.
[0021]
FIG. 5 shows the other side closing valve in the refrigerant circuit. Unlike FIG. 1, the service port portion 14 is not provided, the orifice diameter of the valve seat 53 is about 6 mm, and the inner diameter of the caulking tube portion 4 is 10.4. It is about 4 mm and the inner diameter of the valve hole 2 is about 10 mm, and the connecting tube 54 is slightly narrowed. The rest is the same as FIG.
[0022]
The connecting pipe 54 was brazed while the caulking portion 4 was cooled after the caulking cylinder portion 4 was caulked. Thereby, the breaking strength of the crimping cylinder part 4 was further increased and the safety was ensured without enlarging the crystal grain size of the material by heating. At the same time, the stress at the time of processing could be further dispersed by making the caulking shape even. As described below, the stress corrosion cracking test was also satisfied, and safety and sealability could be secured even when exposed to the atmosphere for a long time.
[0023]
FIG. 6 shows the results of a stress corrosion cracking test based on the technical standard of the Telecommunications Machinery Manufacturers Association (CES, M0010-3, Method A). FIG. 6 shows the shut-off valve of FIG. When the five closing valves (represented by the same test product 1/4 ″) were tested in a state where the valve stem 3 was pulled up by 11 Nm for each of the five samples, that is, the caulking tube portion 4 was stressed, all were caulking. Cracks did not occur in the cylindrical portion 4 and the like.
[0024]
In this test method, 107 g of primary ammonium chloride was dissolved in about 700 ml of distilled water, and a solution obtained by dissolving 50 to 70 g of primary sodium hydroxide in about 250 ml of distilled water was added to the solution, and the hydrogen ion concentration ( When the pH becomes 10 ± 0.1, the solution adjusted so that the total amount is about 1000 ml is put in the bottom of the desiccator, and the test product is left in contact with the solution for 72 hours at 20 ± 2 ° C. After standing, it was washed with 10% sulfuric acid to check for cracks.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of a valve device of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part before caulking in FIG.
3 is an enlarged cross-sectional view of a main part after caulking in FIG.
FIG. 4 is an enlarged sectional view of a main part of a second embodiment.
FIG. 5 is a cross-sectional view of a third embodiment.
FIG. 6 is a chart showing the results of a stress corrosion cracking test.
FIG. 7 is a cross-sectional view of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Valve casing, 11; Valve rod receiving cylinder 2; Valve hole 3; Valve rod 4; Caulking cylinder part 5; Passage 6; Operation end side annular part, 60; Part

Claims (2)

The valve rod (3) is received in the valve hole (2) provided in the valve housing (1), and the crimping tube portion (4) is integrally provided on the open side of the valve hole (2) to rotate the valve rod (3). In the valve device that opens and closes the internal passage (5) by advancing and retreating, a predetermined thickness is secured between the inner and outer surfaces of the caulking cylinder part (4), and the inner diameter of the caulking cylinder part (4) before caulking is set. Enlarging the inner diameter of the valve hole (2) so that the inner surface of the bending start end of the caulking tube portion is positioned radially outward from the inner surface of the valve hole , and the inner surface of the bending end after the caulking of the caulking tube portion Positioned radially inward from the inner surface of the hole and on the inclined inner surface connecting the bending start and end of the caulking tube portion (4), at the operation end side of the valve rod at the opening operation position of the valve rod (3) pressure contact portion for pressing the annular portion (6) provided with a (7), contiguous with the bending start end of the caulking tube portion (4) A valve stem receiving sleeve of Kibenkatami (1) (11), a valve device, characterized in that the caulking tube portion (4) Thick thick portion than the thickness of the (8) is provided over a predetermined length. The valve device according to claim 1, wherein the operation end side annular portion (6) of the valve stem (3) is provided with a radius (60) that makes frictional contact with the pressure contact portion (7) .

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