JP2004270853A - Electrically operated valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically operated valve which is superior to assemble and which is configured so that a bush in upper end of the valve body of the electrically operated valve does not project upward out of the opening of the upper end of the valve itself when replacing a motor assembly integrally connected with the electrically operated valve. <P>SOLUTION: In the electrically operated valve adapted to arrange the valve assembly comprising the valve body and a bellows within the valve itself, it is configured so that the bush of the upper end of the valve body does not project out of the opening of the upper end of the valve itself, by providing in the vicinity of the opening of a valve chamber a protuberance part preventing the valve head of the valve body from being escaped from the valve chamber of the valve itself. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor-operated valve that is integrally connected to a motor assembly having a final output shaft that moves forward and backward, and that is used for controlling the flow rate of a refrigerant or the like.
[0002]
[Prior art]
As a typical conventional example of the motor assembly described above, the stepping motor assembly disclosed in Patent Document 1 is cited, and as a typical conventional example of the above-described motor operated valve, the motorized valve disclosed in Patent Document 2 is cited. Can do.
[0003]
The motor assembly according to the conventional example and the valve body according to the conventional example are integrally connected by screwing and fastening the cap nut member 8 on the motor assembly 2 side to the valve main body 100 as shown in FIG. It is done by doing.
[0004]
The motor assembly includes a stepping motor in the case 2 and a reduction gear train and a final gear inside a gear box assembled to the stepping motor. The output of the motor moves the final output shaft 6 forward and backward by a female screw member 7 fixed to the case 2 via a gear box gear.
[0005]
The valve main body 100 integrally connected to the motor assembly includes a stem portion 202 disposed so as to be opened / closed forward / backward with respect to the valve seat 101 to which the first passage 400 and the second passage 500 are connected, and the stem portion 202. A valve body 200 including a valve head 201 to be fitted, and a bellows 300 disposed in a bellows chamber 103 of the valve main body 100 so as to be extendable and contractible are provided.
[0006]
The valve head 201 of the valve body 200 is slidably provided in the valve chamber 102 of the valve body 100, and the metal elastic stretchable bellows 300 has a lower end portion 301 at the stem portion 202 of the valve body 200. While being fixed by soldering, the upper end portion 302 thereof is soldered and fixed to the upper end opening 104 of the valve main body 100 and the washer 108 fixed by caulking. Reference numeral 63 denotes a sphere provided between the final output shaft 6 and the bush portion 203.
[0007]
By soldering and fixing the bellows 300, the valve chamber 102 and the bellows chamber 103 in the valve main body 100 are maintained in a completely sealed state with respect to the outside, and even if the motor assembly is removed from the valve body, the first Leakage of the refrigerant and the like in the passage 400 and the second passage 500 is completely prevented.
[0008]
[Patent Document 1]
JP 2002-84732 A [Patent Document 2]
Japanese Patent Application Laid-Open No. 11-82996
[Problems to be solved by the invention]
In the motor-operated valve that is integrally connected as described above, the motor assembly side may need to be replaced. At that time, the operation of the operating unit is stopped and the cap nut is fastened. By loosening the member 8, the motor assembly is removed from the motorized valve.
[0010]
When the motor assembly is removed, the final output shaft 6 on the motor assembly side is not restrained by the valve body 100, so that the bottom surface of the valve head 201 and the bellows 300 is the internal pressure inside the valve chamber 102 and the bellows chamber 103. In combination with the elastic contraction force of the metal bellows 300 itself, the valve head 201 of the valve body 200 largely escapes from the valve chamber 102, and the stem portion 202 of the valve body 200 is also As shown in FIG. 7, it is inevitable that the valve body 100 protrudes from the upper end opening 104 to the outside.
[0011]
The pop-up state of the valve body 200 shown in FIG. 7 is when the cap nut member 8 on the motor assembly side is to be screwed and fastened to the valve body 100 in order to integrally connect the motor assembly to be replaced with the valve body 100. Before the fastening starts, the lower end of the final output shaft 6 directly contacts the bush portion 203 at the uppermost part of the valve body 100, which causes a problem that the assemblability for integrally connecting the valve body 100 and the motor assembly is impaired. It was a thing.
[0012]
The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent the valve body 200 from popping out from the upper end opening 104 portion of the valve body 100 when the motor assembly is removed. It is in providing the motor operated valve which was made.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the motor-operated valve according to the invention according to claim 1 as an independent claim is such that the valve head of the valve body is slidably fitted in the valve chamber of the valve body, A bellows having a lower end and an upper end fixed to the opening of the valve body by soldering is disposed in the bellows chamber of the valve body so as to be extendable and contractable, and the valve body is brought into contact with the final output shaft of the motor assembly. In the motor-operated valve configured to open and close the valve head with respect to the valve seat as the output shaft moves forward and backward, a convex portion is provided on the inner peripheral surface in the vicinity of the opening of the valve chamber, and the valve head A valve formed of the stem and bellows by providing a cut portion into which the convex portion can be fitted on the outer peripheral surface of the valve, and fitting and inserting the valve head into the valve chamber in a state where the convex portion is fitted into the cut portion. After rotating the body and turning the arc part of the valve head under the convex part It is characterized in that the valve body is such not to pop out upward from the valve body opening.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view showing an embodiment of the present invention. Since the basic configuration and operation of the conventional example shown in FIG. 6 are the same, the description thereof is omitted to avoid duplication. 6, a convex portion 106 is provided in the vicinity of the opening on the inner peripheral surface of the valve chamber 102, and an arc portion of the valve head 201 is circulated below the convex portion 106, thereby It is characterized in that escape from the valve chamber 102 is prevented, and the stem portion 202 of the valve body 200 is prevented from jumping upward from the upper end opening 104 of the valve body 100.
[0015]
In the configuration characterized by the above, the valve body 100 is provided with two convex portions 106 having a crescent-shaped plane cross section as shown in FIG. 2 in the vicinity of the opening portion 105 of the valve chamber 102. Reference numeral 105 denotes a shape surrounded by two parallel strings and two opposing arcs.
[0016]
Further, the valve head 201 of the valve body 200 slidably fitted in the valve chamber 102 corresponds to the above-mentioned two convex portions 106 on the outer peripheral surface thereof, and the cross-sectional shape of the valve head 201 is a chorus-like two. When two cut portions 204 are formed and the cross-sectional areas A, B, C, and D of the valve head 201 are made to face the opening 105 of the valve chamber 102 in a phase as shown in FIG. The head 201 can be fitted into the valve chamber 102.
[0017]
In FIG. 2A, after inserting the valve head 201 into the valve chamber 102 and rotating it 90 degrees in the direction of the arrow a in the figure, the state shown in FIG. The circular arc portions of the cross-sectional areas A, B, C, and D of the valve head 201 will wrap around the convex portion 106, respectively.
[0018]
When the upper end portion 301 of the bellows 300 is soldered and fixed to the washer 108 fixed to the upper end opening 104 portion of the valve body 100 in the state shown in FIG. Since the arc portion wraps around the lower side of the convex portion 106, the valve assembly including the valve body 200 and the bellows 300 receives the internal pressure in the valve chamber 102 and the bellows chamber 103 and the elastic contraction force of the bellows 300 itself. Even if this happens, the arc portion of the valve head 201 is locked to the convex portion 106 of the valve chamber 101, so that the stem portion 202 of the valve body 200, as shown in FIG. The upper end opening 104 does not protrude above the level.
[0019]
FIG. 4 shows another embodiment of the main part of the motor-operated valve according to the present invention, and is a longitudinal sectional view of the motor-operated valve when the motor assembly is removed. Basically, the conventional motor-operated valve shown in FIG. 6 except that the stem 202 does not protrude upward from the upper end opening 104 of the valve body 100. Therefore, the same or equivalent parts in FIG. The description is omitted. 4, 107 is a bottomed cylindrical member provided between a washer 108 and a step portion 109 provided in the vicinity of the valve chamber opening 105 of the valve body 100. As shown in FIG. A through hole 107 b is provided, a peripheral portion 107 c of the through hole 107 b is in contact with the stepped portion 109, a peripheral edge portion 107 d of the opening of the cylindrical portion 107 is in contact with the washer 108, and the bellows 300 is placed inside the cylindrical member 107. The stem 200 is inserted into the through hole 107b.
[0020]
According to the cylindrical member 107, even if the stem portion 202 protrudes upward and outward as described above, the stem portion 202 is moved upward by the valve head 201 of the stem 200 being locked to the peripheral portion 107c. Can be prevented from jumping out.
[0021]
【The invention's effect】
The motor-operated valve according to the present invention is provided with a convex portion on the inner peripheral surface in the vicinity of the opening of the valve chamber, a cut portion into which the convex portion can be fitted on the outer peripheral surface of the valve head, and the convex portion as the cut portion. The valve head is fitted and inserted into the valve chamber in a state where the valve head is inserted into the valve chamber, the valve assembly including the valve body and the bellows is rotated, and the arc portion of the valve head is caused to wrap around the convex portion. After that, since the bush portion at the upper end of the valve body is configured not to protrude upward from the opening of the valve body, excellent assemblability can be obtained when replacing the motor assembly integrally connected to the motor-operated valve. There is an effect that can be secured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of an embodiment of the present invention integrally connected to a motor assembly.
FIG. 2 is an explanatory view showing the mutual relationship between the valve chamber of the valve main body and the valve seat portion of the valve body according to one embodiment of the present invention, in which FIG. 2 (a) can fit the valve head into the valve chamber. FIG. 4B shows a phase in which the valve head is rotated 90 degrees so that the valve head does not escape from the valve chamber.
FIG. 3 is a cross-sectional view of the motor-operated valve according to the present invention when the motor assembly in FIG. 1 is removed.
4 is a cross-sectional view of another motor-operated valve according to the present invention when the motor assembly in FIG. 1 is removed.
FIG. 5 is a view showing a cylindrical member in FIG. 4;
FIG. 6 is a cross-sectional view showing a main part of a motor-operated valve according to a conventional example integrally connected to a motor assembly.
7 is a cross-sectional view of a motor-operated valve according to a conventional example when the motor assembly in FIG. 6 is removed.
[Explanation of symbols]
2 Outer case 6 Final output shaft 7 Female screw member 8 Cap nut member 100 Valve body 101 Valve seat 102 Valve chamber 103 Bellows chamber 104 Valve body upper end opening 105 Valve chamber opening 106 String-like convex part 108 Washer 200 Valve body 201 Valve head 202 Stem portion 203 Bush portion 204 String-like cut portion 300 Bellows 301 Lower end portion of bellows 302 Upper end portion of bellows 400 First passage 500 Second passage

Claims (3)

A bellows in which the valve head of the valve body is slidably fitted in the valve chamber of the valve body, and the lower end and the upper end of the valve body are fixed to the stem portion and the opening of the valve body with solder. Is disposed in the bellows chamber of the valve body so as to be extendable and contractible, and the valve body is brought into contact with the final output shaft of the motor assembly to open and close the valve head with respect to the valve seat as the output shaft moves forward and backward. In the motorized valve
A state in which a convex portion is provided on the inner peripheral surface in the vicinity of the opening of the valve chamber, a cut portion into which the convex portion can be fitted is provided on the outer peripheral surface of the valve head, and the convex portion is fitted in the cut portion. Then, the valve head is fitted and inserted into the valve chamber, the valve body made of the stem and bellows is rotated, and the arc portion of the valve head is turned below the convex portion, and then the valve body The motor-operated valve is characterized in that does not protrude upward from the valve body opening. 2. The motor-operated valve according to claim 1, wherein each of the convex portion and the cut portion is provided symmetrically in pairs. The motor-operated valve according to claim 1, wherein the convex portion has a crescent shape in a flat cross section, and the cut portion corresponding to the convex portion has a crescent shape in the same plane cross section.

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