KR101276967B1 - Flow control valve - Google Patents

Abstract

assignment

Provided is a flow control valve capable of reducing noise (refrigerant passage sound) generated by a refrigerant passing through a groove as a refrigerant deriving fastening portion as much as possible.

Solution

A valve seat member 14 having a valve seat portion 14A having a tapered surface 14a having a reverse conical surface shape, and a valve body portion having a tapered surface 21a having a reverse conical surface facing the valve seat portion 14A. In the valve seat portion 14A, a valve rod 20 having a 21A is provided, and the refrigerant is tightened and drawn out even when the valve body 21A is in contact with the valve seat portion 14A. A bleed groove 17 having a predetermined depth is formed, and the center angle θb of the tapered surface 21a of the valve body 21A is subtracted from the center angle θa of the tapered surface 14a of the valve seat portion 14A. The angle α of 1/2 of the angle is 1.0 ° or more and 2.5 ° or less.

Description

Flow Control Valve {FLOW CONTROL VALVE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve such as a solenoid (electronic) drive type or a motor drive type used in an air conditioner, and the like. It is related with the formation of the bleed groove as.

Conventionally, in a flow control valve used in an air conditioner or the like, for example, as shown in the following Patent Documents 1 and 2, for example, a refrigerant extracting fastening part such as a dehumidification (dry) operation (refrigerant even in a valve closed state) It is known to provide a groove in the valve seat portion (valve seat) as a clamp).

However, as in the conventional flow control valve, if only a groove serving as a refrigerant extracting fastening portion is provided in the valve seat portion, there is a problem that an unpleasant noise (refrigerant passage sound) is generated by the refrigerant passing through the groove. .

Then, in order to reduce such noise (refrigerant passage sound) as much as possible, the inventors of this application etc. propose the flow control valve like the bar previously disclosed by following patent document 3. As shown in FIG.

That is, the flow control valve of this proposal has the valve seat member which has a valve seat part which has a tapered surface of a reverse conical surface, and the valve body part which has a tapered surface of the reverse conical surface which folds in the said valve seat part. A bleed groove having a predetermined depth is formed in the valve seat portion to provide a valve rod to tighten and extract the refrigerant even when the valve seat portion abuts the valve body portion, and at the bottom of the bleed groove, In order to disperse | distribute a refrigerant | coolant, the recessed part of predetermined depths, such as a triangular shape, a semicircular arc shape, and a trapezoid shape, is formed in multiple rows.

In the proposed control valve having such a configuration, at the time of dehumidification (dry) operation of the refrigerant air conditioner, the refrigerant is dispersed in the bleed groove and is also dispersed in the concave portion so that it is derived, thereby passing through the bleed groove. Noise (refrigerant passage sound) caused by the refrigerant can be effectively reduced, and sound noise can be achieved.

Patent Document 1: Japanese Patent Application Laid-Open No. 11-51514

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-150580

Patent Document 3: Japanese Patent Application No. 2006-158785

However, even in the proposed control valve, the noise reduction effect is not sufficient, and there is a strong demand for the development of a flow control valve capable of further quieting.

This invention is made | formed in response to the said request, The objective is that the noise (refrigerant passage sound) which generate | occur | produces by the refrigerant | coolant which passes through the bleed groove as a fastening part for refrigerant | coolant derivation can be reduced as much as possible, and furthermore, The present invention provides a flow rate control valve capable of achieving silent operation.

In order to achieve the above object, the flow control valve according to the present invention basically has a valve seat member having a valve seat portion having a tapered surface of a reverse conical surface, and a tapered taper shape in contact with the valve seat portion. A valve rod having a valve body portion having a surface is provided, and a bleed groove of a predetermined depth is formed in the valve seat portion so as to tighten and extract the refrigerant even when the valve body portion is in contact with the valve seat portion. In the bottom of the bleed groove, a plurality of rows of concave portions having a predetermined depth are arranged in parallel so as to disperse the refrigerant, and the center angle θb of the tapered surface of the valve body portion is subtracted from the center angle θa of the tapered surface of the valve seat portion. The angle α of 1/2 of the angle is 1.0 ° or more and 2.5 ° or less.

In this case, in a preferable aspect, the recessed part of predetermined depth provided in the bottom part of the said bleed groove is a recessed part of predetermined depth, such as V shape, a semi-elliptic arc shape, and trapezoid shape.

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In the flow control valve according to the present invention, the angle α of 1/2 of the angle obtained by subtracting the center angle θb of the tapered surface of the valve body portion from the center angle θa of the tapered surface of the valve seat portion is 1.0 ° or more and 2.5 ° or less. Since the cross section formed between the tapered surface of a valve body part and the tapered surface of a valve seat part upstream rather than those abutting parts, the clearance gap Sa of an acute-angled triangle is 8 degrees, and the said angle (alpha) was 8 degrees It is greatly reduced compared to the postwar period. For this reason, bubbles contained in the refrigerant passing through the bleed groove, which are the sources of noise generation, are sufficiently subdivided, whereby noise (refrigerant passage sound) generated by the refrigerant passing through the bleed groove can be further reduced than before. It is possible to plan further silence.

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EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the flow control valve of this invention is described, referring drawings.

1 is a longitudinal sectional view showing an embodiment of a flow control valve according to the present invention.

The flow control valve 1 of the illustrated embodiment is used for a refrigeration cycle such as an air conditioner, and is composed of a small diameter portion 12A having a reverse user cylindrical shape and a large diameter portion 12B connected to a lower portion thereof. The valve body 10 by the valve seat member 14 with a flange image part sealed to the can 12 with a step | step which consists of a step | step and the large diameter part 12B of this can 12 from below by sealing welding, etc. Is composed. The inner circumferential side of the upper end of the valve seat member 14 is a valve seat portion 14A having a tapered surface 14a having an inverted conical surface. The valve seat portion 14A has a lower large diameter portion of the valve rod 20. 21 A of valve body parts which have the tapered surface 21a of the reverse cone surface provided in the outer peripheral side of the lower end of (2 (theta) a) are made to be folded (it mentions later).

In addition, a conduit (joint) 41 is formed at one side of the large diameter portion 12B of the can 12, and a conduit (joint) 42 is provided at the lower portion of the valve seat member 14 by soldering or the like. Junction is connected.

The lower portion of the small diameter portion 12A of the can 12 is fixed by the suction iron 22 soldering or caulking fixed, which is a fixed iron core, and the stand of the suction 22 and the can 12 is fixed. The valve chamber 15 is partitioned by the neck portion 12B and the valve seat member 14, and the lower large diameter portion 2θa of the valve rod 20 is positioned in the valve chamber 15.

The small diameter portion 20b of the valve rod 20 is slidably inserted into the through hole provided in the suction 22, and the upper end of the valve rod 20 is slidably inserted into the upper portion of the can 12. It is inserted into the hollow plunger 24 and caulking is fixed.

A compression coil spring 25 is interposed between the plunger 24 and the aspirator 22, and the compression coil spring 25 always separates the plunger 24 from the aspirator 22, that is, 21 A of valve body parts are added to the direction (a valve opening direction) which isolate | separates from 14 A of valve seat parts.

An electronic actuator 30 having a housing 32, a coil 33, a bobbin 34, and the like is attached to the outer circumferential side of the can 20 (small diameter portion 20b). Moreover, the stopper 37 which has the hemispherical convex part by the rivet 36 etc. is fixed to the upper part of the housing 32, and the hemispherical convex part of this stopper 37 is multiple places in the can 20 side (for example) For example, the electronic actuator 30 is positioned and fixed to the can 20 by fitting to any of the hemispherical recesses provided.

Under such a configuration, in the state where the coil 33 is not energized, the plunger 24 is in the upper position by the biasing force of the compression coil spring 25, and the valve body 21A of the valve rod 20 is It is separated from the valve seat portion 14A of the valve seat member 14. Therefore, the refrigerant can freely flow between the two conduits 41 and 42 through the valve chamber 15 (in this case, the flow of the conduit 41 to the conduit 42 as shown by the arrow in the figure). Default).

When the coil 33 is energized, the aspirator 22 and the plunger 24 are magnetized by the magnetic field emitted from the coil 33. The magnetic force of the suction 22 pulls the plunger 24 toward the suction 22 against the biasing force of the compression coil spring 25. Thereby, 21 A of valve body parts of the valve rod 20 contact 14 A of valve seats, and it will be in a valve closing state (position shown in FIG. 1).

In addition to the above configuration, in the present embodiment, the refrigerant is drawn out by tightening the refrigerant in the valve closing state to lead the conduit 41 to the conduit 42, that is, when performing a dehumidification (dry) operation in an air conditioner. As shown in FIG. 2, the cross section is shown in FIG. 3 at a plurality of locations (for example, eight locations at 45 ° intervals) of the valve seat portion 14A as shown in FIG. 2. A bleed groove 17 having a depth d is formed, and the bottom portion 17B of the bleed groove 17 faces the conduit 42 from the valve chamber 15, for example, in the shape of a semi-elliptical cross section. And the concave portion 18 having a depth of e is provided in plural rows (for example, two rows).

As described above, the plurality of rows (for example, two rows) of the concave portions 18 having a depth of e are provided in the bleed grooves 17 having a depth of d, so that at the time of dehumidification (dry) operation of the refrigerant air conditioner, The coolant is dispersed in the eight bleed grooves 17 and is also dispersed in the two rows of recesses 18 so that the coolant passes through the bleed grooves 17. Coolant passage sound) can be effectively reduced.

In addition, the cross-sectional shape of the said recessed part 18 is not limited to the cross-sectional half elliptic arc shape as shown in FIG. 3, The cross-sectional shape is made into V shape, semi-circular arc shape, trapezoid shape, etc., or a combination thereof. Also good.

In addition to such a structure, in the flow control valve 1 of this embodiment, the following structure is further added.

That is, as shown in FIG. 4, FIG. 5, the center angle (theta) b of the taper surface 21a of the said valve body part 21A is made from the center angle (theta) of the tapered surface 14a of the said valve seat part 14A. The angle α of 1/2 of the subtracted angle is 1.0 ° or more and 2.5 ° or less, and the gap between the tapered surface 21a of the valve body portion 21A and the tapered surface 14a of the valve seat portion 14A is determined. As for the clearance gap Sa of the acute-angled triangular cross section formed in the upstream rather than those abutting part P, compared with the said angle (alpha) before and after 8 degrees, it is greatly reduced. For this reason, bubbles contained in the refrigerant passing through the bleed groove 17, which is the source of noise generation, are sufficiently subdivided, whereby the noise generated by the refrigerant passing through the bleed groove 17 (the refrigerant passage sound) is previously known. It is possible to further reduce it, and to further stabilize the sound.

In order to verify such an effect, a start experiment was conducted, and the results as shown in FIGS. 6 and 7 were obtained. That is, in FIG. 6 and FIG. 7, sound pressure (dB) representing the noise level is taken on the vertical axis, and the angle α (= (θa-θb) / 2) and time s are set on the horizontal axis, respectively. As the starting experiment value is shown, the sound pressure increases as the angle α increases, and in the vicinity of the angle α exceeding 2 °, the sound pressure exceeds 33.8 dB, which is a standard allowable limit value, and When the angle α is 1.0 ° or more and 1.5 ° or less, it is found that the noise reduction effect is greatest.

In addition, the number of recesses 18 in the bleed groove 17 is one, two, three, four (see FIG. 9),. Sound pressure (dB) which shows the noise level at the time of making it into FIG. 8 is shown in FIG. As can be seen from these, the number of the recesses 18 is appropriate, and even if the number is 5 or more, no noise reduction effect is obtained.

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BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows one Embodiment of the flow control valve which concerns on this invention.

FIG. 2 is a perspective view of the valve seat member shown in FIG. 1. FIG.

3 is an enlarged cross sectional view showing a bleed groove formed in a valve seat portion of the valve seat member shown in FIG. 2;

4 is an enlarged cross-sectional view of the lower large diameter portion of the valve rod and the upper portion of the valve seat member in one embodiment of the present invention.

FIG. 5 is an enlarged view of part X of FIG. 4; FIG.

6 is a graph provided to explain the operational effects of one embodiment of the present invention.

7 is a graph provided to explain the operational effects of one embodiment of the present invention.

FIG. 8 is a graph showing sound pressure when the number of recesses in the bleed groove is changed in one embodiment of the present invention. FIG.

FIG. 9 is an enlarged cross sectional view showing a case where the number of recesses in the bleed groove is 4 in one embodiment of the invention; FIG.

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(Explanation of symbols for the main parts of the drawing)

1: flow control valve

10: valve body

14: valve seat member

14A: valve seat

14a: tapered surface

14b: top side

14c: rectification groove

17: bleed home

17B: Bottom

18: recess

20: valve rod

21A: Valve body part

21a: tapered surface

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Claims (8)

And a valve rod member having a valve seat member having a tapered surface having a reverse conical surface shape, and a valve rod having a tapered surface having a reverse conical surface facing the valve seat portion, wherein the valve seat portion has the valve seat portion. As a flow control valve in which a bleed groove of a predetermined depth is formed in the valve seat portion so as to tighten and extract the refrigerant even when the valve closes the valve, In the bottom of the bleed groove, a plurality of rows of recesses having a predetermined depth are arranged in parallel so as to disperse and extract the refrigerant. The angle α of 1/2 of the angle obtained by subtracting the center angle θb of the tapered surface of the valve body portion from the center angle θa of the tapered surface of the valve seat portion is 1.0 ° or more and 2.5 ° or less. Flow control valve. The method of claim 1, The concave portion having a predetermined depth provided at the bottom of the bleed groove is a concave portion having a predetermined depth having any one of a V-shaped shape, a semi-elliptic arc shape, and a trapezoidal shape. Flow control valve. delete delete delete delete delete delete

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