JP4925782B2 - Flow control valve - Google Patents

Description

  The present invention relates to a flow rate control valve that is incorporated in, for example, an air conditioner, a refrigerator, or the like and used to control the flow rate of refrigerant.

FIG. 4 is a longitudinal sectional view showing an example of this type of conventional flow control valve. The flow control valve 200 includes a valve body 20 having a valve chamber 21 and a valve seat 22 formed therein, a valve body 23 that opens and closes the opening of the valve seat 22 in contact with and away from the valve seat 22, and a valve body 20. The can 40 is fixed to the can. The can 40 incorporates a rotor 30, and a stator 50 that rotationally drives the rotor 30 is fitted on the can 40. The valve body 20 is provided with a pipe 20a extending downward from the bottom surface and a pipe 20b extending horizontally from the side surface, and the refrigerant is introduced into the valve chamber 21 by these pipes 20a and 20b. The refrigerant in the valve chamber 21 is led out to the outside.

  The can 40 is formed of a nonmagnetic metal and has a top cylindrical shape. The can 40 is fixed to the flange plate 47 fixed to the upper portion of the valve body 20 by welding or the like, and the inside is kept airtight. The stator 50 includes a yoke 51 made of a magnetic material and upper and lower stator coils 53, 53 wound around the yoke 51 via a bobbin 52, and includes a fitting hole 50 a that fits outside the can 40. Have.

  The valve body 23 is formed at the lower end of the valve shaft 24 and has a structure as a needle valve. The rotation of the rotor 30 is converted into an operation of making contact with and separating from the valve seat 22 of the valve body 23 by the conversion mechanism. This conversion mechanism is screwed into a cylindrical guide bush 26 fixed to the valve body 20 and protruding in the direction of the rotor 30 and having a fixing screw portion 25, and the fixing screw portion 25 of the guide bush 26. It is a screw feed mechanism comprised from the valve-shaft holder 32 which has the moving screw part 31 to do. The fixing screw portion 25 is configured as a male screw formed on the outer periphery of the guide bush 26. Further, the moving screw portion 31 is configured as a female screw formed on the inner periphery of the valve shaft holder 32.

  The valve shaft holder 32 is in the shape of a top cylinder that is located outside the guide bush 26 and opens downward, and the upper reduced diameter portion of the valve shaft 24 is fitted to the center of the top wall of the push nut 33. It is connected by. The valve shaft 24 is fitted into the center of the valve shaft holder 32 so as to be movable up and down, and is always urged downward by a compression coil spring 34 that is mounted in the valve shaft holder 32. On the side wall of the guide bush 26, a pressure equalizing hole 26b for equalizing the pressure between the valve chamber 21 and the inside of the can 40 is formed.

  A return spring 35 formed of a cylindrical compression coil spring is attached to the outer periphery of a push nut 33 that is press-fitted and fixed to the upper end of the valve shaft 24. When the fixing screw portion 25 of the guide bush 26 and the moving screw portion 31 of the valve shaft holder 32 are disengaged, the return spring 35 comes into contact with the inner surface of the can 40 and the screw portions 25 and 31 are screwed together. Energize to return.

  The valve shaft holder 32 and the rotor 30 are coupled via a support ring 36. The upper protrusion of the valve shaft holder 32 is fitted into the inner peripheral hole portion of the support ring 36, and the outer periphery of the upper protrusion is caulked to couple the rotor 30, the support ring 36, and the valve shaft holder 32.

  A ring-shaped lower stopper body 27 is fixed to the guide bush 26, and a plate-shaped lower stopper piece 27a is projected from the upper portion thereof. Further, a ring-shaped upper stopper body 37 is fixed to the valve shaft holder 32, and a plate-shaped upper stopper piece 37a projects from the lower part thereof so as to be engageable with the lower stopper piece 27a.

  The stator 50 has a plurality of lead terminals 54 connected to the stator coils 53, 53, and a connector 56 to which a plurality of lead wires 55 are connected is connected to the lead terminals 54. A cover 57 covering the connector 56 is welded to the stator 50, and the inside of the cover 57 is filled with a filler 58 such as an epoxy resin.

The can 40 is fitted into the fitting hole 50 a of the stator 50, and the rotation with respect to the valve main body 20 and the can 40 is prevented by a rotation preventing member 59 welded to the lower surface of the exterior portion of the stator 50. Stopping member 59 is made of a metal plate having elasticity such as stainless steel, as shown in FIG. 5 (a), extends a horizontal top wall 100, below the side edges of the top wall 100 Two arm portions 101 and 101 are provided. The top wall 100 is formed with a positioning portion 102 that protrudes upward from one end thereof. The anti-rotation member 59 is fixed to the stator 50 by inserting a protrusion 50 b protruding from the lower surface of the stator 50 into the mounting hole 100 a formed in the top wall 100 and crushing the protrusion with an ultrasonic welder. The stator 50 is fitted with the fitting hole 50a to the can 40 and pushed in the direction of the valve body 20, so that the two arm portions 101, 101 of the anti-rotation member 59 cause the horizontal pipe 20b to be elastically restored. Since it is sandwiched and held, the stator 50 can be fixed to the valve body 20 and the can 40 very easily and reliably.

The a case of a large flow control valve, for example, another form of detent members (see Patent Document 2) used as shown in a perspective view in FIG. 5 (b). The anti-rotation member 79 is formed of an elastic metal plate such as stainless steel, and includes a clip-shaped grip 113 having two arms 112a and 112b extending downward, a grip 113, and a connecting portion 114. And a flat plate-like base portion 115 connected via each other. The base portion 115 is parallel to the top wall of the grip portion 113 and extends longer to the left and right than the top wall. In addition, the base 115 is formed into an arc-shaped portion 117 with the central portion of the edge opposite to the connecting portion 114 being recessed. The two arm portions 112a and 112b have curved portions 119a and 119b formed with a radius of curvature equivalent to the outer diameter of the horizontal pipe 20b. The connecting portion 114 is provided with mounting holes 116, and the left and right extending portions of the base 115 are provided with mountings 118a and 118b.

According to the anti-rotation member 79 configured in this manner, the anti-rotation member shown in FIG. 5 (a) is fitted to the stator in such a manner that the arc-shaped portion 117 is along the outer surface of the can . As in the case of 59, the stator is pushed in the valve body direction, so that the curved portions 119a and 119b of the arm portions 112a and 112b of the detent member 79 hold the horizontal pipe 20b in the radial direction and hold the stator. Is fixed to the valve body. The anti-rotation member 79 has its mounting holes 118a, 118b, and 116 fitted into three of a plurality of protrusions formed at predetermined intervals around the fitting hole on the lower surface of the stator, and the protruding portions of the protrusions are, for example, It is fixed by crushing with an ultrasonic welder.

In FIG. 4 , the position of the lead wire 55 is 180 ° away from the pipe (not shown) held by the anti-rotation member 59. However, there is a case where the lead wire 55 is desired to be in another position. In such a case, the mounting position of the locking member 79 with respect to the stator 50 can be shifted at an interval of 45 ° by changing the protrusions that fit the mounting holes 118a, 118b, and 116 using the locking member 79. it can.

When such a flow control valve is applied to a refrigeration cycle, the refrigerant sent out from the compressor is usually in a liquefied state, but the discharged refrigerant is accompanied by pulsation, that is, pressure fluctuation, and sent through a pipe. When the coming refrigerant passes through the flow control valve, pulsation noise due to intermittent compression is sometimes generated on the inlet side. On the other hand, the flow control valve has been reduced in size, and when the volume of the valve chamber formed in the valve body becomes smaller, the flow rate changes in an operating state where the flow rate changes greatly, such as during transient operation. Accordingly, the change in the ratio of the fluid in the valve chamber becomes relatively large. Such a phenomenon is a cause of noise generated by the flow control valve. Although it has been empirically known that increasing the volume of the valve chamber is effective in suppressing such noise, the amount of metal material used to manufacture the valve body when simply trying to enlarge the valve chamber Increases the manufacturing cost of the flow control valve, and it becomes impossible to meet the demand for downsizing the flow control valve.
No. 2001-50415 (paragraphs [0022] to [0038], FIG. 1) JP 2003-185302 A (paragraphs [0036] to [0038], FIGS. 6 to 7)

  The present invention has been made in view of the above problems, and its object is to increase the volume of the valve chamber with a simple structure without increasing the overall size, and to increase the manufacturing cost. An object of the present invention is to provide a flow rate control valve that can suppress the generation of noise due to a large change in the fluid ratio in the valve chamber even during transient operation.

In order to solve the above-described problems, a flow control valve according to the present invention includes a valve body having a valve chamber and a valve seat formed therein, and a valve body that adjusts the flow rate of fluid by contacting and separating from the valve seat. And a drive unit having a rotor and a stator that rotationally drives the rotor, and a conversion mechanism that converts rotation of the rotor into contact / separation operation of the valve body with respect to the valve seat, and has a chamber that communicates with the valve chamber. A silencer member is provided in the valve body ,
The valve main body includes a fluid inflow pipe communicating with the valve chamber in a direction intersecting the contact / separation direction of the valve body, and a fluid communicating with the valve chamber in a direction corresponding to the contact / separation direction of the valve body. With spill pipes,
The silencing member is composed of two hollow silencing members facing the valve chamber at an angular position of 120 degrees with respect to the axis of the inflow pipe communicating with the valve chamber. .

  According to this flow control valve, the volume of the valve chamber can be expanded without increasing the size of the entire valve. Therefore, even during transient operation, the change in the fluid presence ratio with respect to the volume of the valve chamber is unlikely to increase, and the generation of valve operating noise including pulsating noise is suppressed.

Hereinafter, an embodiment of a flow control valve according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing the overall structure of an embodiment of a flow control valve (motor valve) according to the present invention. Since the flow control valve generally indicated by reference numeral 10 may have the same basic structure as that of the conventional flow control valve 200 shown in FIG. 4 , the conventional flow control valve is provided in the same or similar portion. The same reference numerals as those used for the reference numeral 200 are attached, and detailed description thereof is omitted.

In the flow control valve 10, silencer members 60 a and 60 b having bottomed cylindrical bodies having chambers 64 a and 64 b communicating with the valve chamber 21 are attached to the valve body 20. The valve body 20 is made of a stainless steel material or the like, but has a mounting hole 20 d that penetrates the wall portion and communicates with the valve chamber 21, and the silencer members 60 a and 60 b are on one end side of the body portion 61. The opening end 62 is attached to the valve main body 20 so as to protrude sideways in a state of being fitted in the attachment hole 20d. The other end side of the body portion 61 is closed by a bottomed end portion 63. The muffling members 60a and 60b can be formed by, for example, copper pipe or stainless steel deep drawing. The silencer members 60a and 60b are abutted against a stepped portion 20e having an opening end 62 formed at the back end of the mounting hole 20d, and are brazed to the valve body 20 in this state. The brazing is preferably performed simultaneously with other brazing portions when the flow control valve 10 is assembled. The silencing members 60a and 60b function to increase the volume of the valve chamber 21 without increasing the size of the entire valve.

FIG. 2 is a cross-sectional view showing an embodiment of a silencing member in the flow control valve according to the present invention. As shown in FIG. 2, in the embodiment of the present invention, the two silencing members 60a and 60b are arranged at positions separated from each other by an angle θ (120 degrees) with respect to the position of the axis AA of the inflow pipe 20a. Is done. The distance M from the center 21c of the valve chamber 21 to the innermost end of the sound deadening member 60 (60a, 60b) is set to a half wavelength of the wavelength L of the standing wave generated in the inflow pipe 20a (that is, M = L / 2).
By setting the silencing members 60a and 60b in such an arrangement and size, when the standing wave generated in the inflow pipe 20a reaches the valve chamber 21, the standing wave is reflected after entering the silencing members 60a and 60b and the valve is reflected. Since the phases of the reflected wave returning to the chamber 21 and the standing wave are reversed, both waves cancel, that is, cancel each other out. Therefore, the pulsation sound of the flow control valve 10 can be eliminated. In setting the distance M, it is preferable to perform correction such as opening end correction on the opening end 62 so as to maximize the canceling action of both waves .

The specific shape of the sound deadening member 60a, 60b is not limited to the bottomed cylindrical body, but a copper or stainless steel workpiece that is the same material as the pipe can be manufactured by drawing. This is advantageous in that the manufacturing cost can be kept low. However, instead of the bottomed tubular body, one having the shape shown in FIG. 3 may be employed. 3 (a) shows an example of a dome member 6 6 having a chamber 67 communicating with the valve chamber 21 as part of a spherical shell in the interior, internal to FIG. 3 (b) the chamber 69 communicating with the valve chamber 21 This is an example of a cylindrical body 68 having an arbitrary shape such as a prismatic shape. In this example, the peripheral wall 68a and the bottom wall 68b are formed as separate members.

  Although the embodiments of the flow control valve according to the present invention have been described above with reference to the drawings, the structure of the flow control valve according to the present invention is not limited to these embodiments and is defined by the claims of the present invention. Various modifications are possible within the technical scope. For example, the conversion mechanism may include a reduction mechanism such as a planetary gear reduction mechanism or an inline gear reduction mechanism. By doing so, the resolution of the lift amount of the valve body with respect to the rotation amount of the motor can be increased, and the adjustment flow rate can be controlled with high accuracy. Moreover, although the said embodiment demonstrated the case where this invention was applied to a motor operated valve, this invention is applicable also to a solenoid valve.

It is the longitudinal cross-sectional view which cut the whole structure of one Example of the flow control valve by this invention along the BOB line of FIG. The arrangement of the silencing member used in the flow control valve according to the present invention is a transverse cross-sectional view illustrating. Another example of a silencing member used in the flow control valve according to the invention is shown to cross-sectional view. Is a longitudinal cross-sectional view showing an example of a conventional flow control valve. It is a perspective view which shows an example of the rotation prevention member which prevents the circumference | surroundings of a stator .

10, 11, 12 Flow control valve 20 Valve body 20a Inflow pipe 20b Outflow pipe 20c Connection hole 20d Mounting hole 20e Stepped portion 21 Valve chamber 21c Center 22 of valve chamber 21 Valve seat 23 Valve body 30 Rotor 50 Stator 50b Convex portion 60; 60a, 60b, 60c; 60d, 60e Silencer member 61 Body 62 Open end 63 Bottomed end 64; 64a, 64b, 64c; 64d, 64e Chamber 66 Dome body 67 Chamber 68 Cylindrical body 69 Chamber 79 Around Stopping member M Distance L Wavelength of standing wave

Claims (1)

A valve body having a valve chamber and a valve seat formed therein, a valve body that adjusts a flow rate of fluid by contacting and separating from the valve seat, a drive unit having a rotor and a stator that rotationally drives the rotor; and a conversion mechanism for converting the rotation of the rotor in contact and separation operation to the valve seat of the valve body, the silencing member having a chamber communicating with said valve chamber to a flow rate control valve provided in the valve body ,
The valve main body includes a fluid inflow pipe communicating with the valve chamber in a direction intersecting the contact / separation direction of the valve body, and a fluid communicating with the valve chamber in a direction corresponding to the contact / separation direction of the valve body. With spill pipes,
The silencing member is composed of two hollow silencing members facing the valve chamber at an angular position of 120 degrees with respect to the axis of the inflow pipe communicating with the valve chamber. Flow control valve.

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