JP2007032664A - Motor operated flow control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor operated flow control valve capable of hardly causing deformation damage, malfunction, noise, or the like of an upper limit fixed stopper body and an upper limit movable stopper body, and capable of improving durability and reliability. <P>SOLUTION: The upper limit fixed stopper body 30 fixed to a can 20 of the motor operated flow control valve 10 is made of sheet metal, it is formed in an inverted fry pan shape, and a plurality of sector or circular arc shaped fastening openings 35 arranged at predetermined angular intervals is formed on a top face part 32 of the upper limit fixed stopper body 30. The upper limit movable stopper body 50 fixed to a rotor 12 of the motor operated flow control valve 10 has a base plate part 52, a swash plate part 54 bent upward for just a predetermined angle α from the base plate part 52, and a collision edge part 55 bent from the swash plate part 54, and a tip 55a of the collision edge part 55 is butted and fastened by a circumferential one end rim part 35a of the fastening opening 35. The collision edge part 55 is slanted upward just a predetermined angle β (within a range of 0-20 degrees) with respect to a rotational plane (a horizontal plane). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric flow control valve, and more particularly to an electric flow control valve suitable for use in a refrigeration cycle such as an air conditioner or a refrigerator.

  As an electric flow control valve used in this type of refrigeration cycle, as seen in Patent Document 1 below, a valve body provided with a valve chamber having a valve seat, and a valve body that contacts and separates from the valve seat A valve shaft having a can, a can joined to the valve body, a rotor disposed on the inner periphery of the can and integrally attached to the valve shaft, and an outer periphery of the can for rotating the rotor Arranged near the top of the can to determine the upper limit of the rotor, and a screw feed mechanism that raises and lowers the valve shaft and the rotor to bring the valve body into and out of contact with the valve seat. There has been known one provided with a fixed upper limit fixed stopper body and an upper limit movable stopper body attached to the upper portion of the rotor.

  In the electric flow control valve having such a configuration, when the stator is energized and energized, the rotor and the valve shaft rotate and are raised and lowered by the screw feed mechanism, thereby changing the valve opening and adjusting the flow rate of the refrigerant. Is done.

  By the way, in the electric flow control valve described in Patent Document 1, when the rotor rises while rotating to the ascent limit, the valve-opening restriction pin as the upper limit movable stopper body becomes the stop member as the upper limit fixed stopper body. A structure is adopted in which the upper limit position of the rotor is regulated by contact.

  However, the stop member is made of stainless steel, for example, and there is no problem when the valve opening restricting pin comes into contact with the side surface of the stop member. However, when the top of the pin comes into contact with the bottom surface of the stop member, There is a concern that the stop member and the pin are fixed by friction or the pin gets over and the rotor cannot rotate in the reverse direction (valve closing direction).

  In order to prevent such a problem, Patent Document 2 below proposes an upper limit fixed stopper body and an upper limit movable stopper body having the following configurations.

  Hereinafter, a brief description will be given with reference to FIG. That is, the upper limit fixing stopper body 130 is made of, for example, sheet metal and has an inverted frying pan shape (see also FIG. 4 and the like), and a plurality of fan-shaped or arc-shaped locking openings 135 are formed on the upper surface portion 132 at predetermined angular intervals. The upper limit movable stopper body 150 is locked by the circumferential end edge 135a of each of the locking openings 135.

  Further, the upper limit movable stopper 150 is made of, for example, a sheet metal, and has a substantially annular substrate portion 152, a swash plate portion 154 bent upward by a predetermined angle from the substrate portion 152, and the swash plate portion 154. , And the front end 155a of the contact side 155 is engaged with the circumferential end edge 135a of the locking opening 135. It has come to be stopped.

In such a configuration, since the upper limit movable stopper body 150 is provided with the swash plate portion 154, when the abutting side portion 155 comes into contact with the lower surface of the upper limit fixed stopper body 130, it is easy to move downward. Since the moving angle is small, even if deformation is repeated, metal fatigue or the like of the material hardly occurs, and the durability of both stopper bodies 130 and 150 is improved.
Japanese Patent Laid-Open No. 10-89521 JP 2002-357277 A

  However, even in the case described in Patent Document 2, as shown in FIG. 8B, the abutting side portion 155 rides on the upper surface portion 132 of the upper limit fixed stopper body 130, and the upper limit movable stopper body. 150 and the upper limit fixing stopper body may be deformed and damaged, and as shown in FIG. 8C, the abutting side portion 155 is brought into surface contact with the lower surface of the upper limit fixing stopper body 130 to be solidified. May cause problems such as malfunctions and noise.

The present invention has been made in view of such circumstances, and its object is to
It is an object of the present invention to provide an electric flow control valve that is less likely to cause deformation damage, malfunction, noise, and the like of an upper limit fixed stopper body and an upper limit movable stopper body, and that can improve durability and reliability.

  In order to achieve the above object, an electric flow control valve according to the present invention includes a valve body provided with a valve chamber having a valve seat, a valve shaft having a valve body contacting and separating from the valve seat, and the valve body. A can that is joined to the inner periphery of the can, a rotor that is integrally attached to the valve shaft, a stator that is disposed on the outer periphery of the can to rotationally drive the rotor, and the rotor The upper limit fixed stopper body disposed and fixed on the inner periphery near the top of the can and the upper limit movable stopper body attached to the upper portion of the rotor.

  The upper limit fixing stopper body has an inverted frying pan shape, and a plurality of fan-shaped or arc-shaped locking openings are arranged and formed on the upper surface thereof with a predetermined angular interval, and one circumferential end edge of each locking opening Thus, the upper limit movable stopper body is locked.

  The upper limit movable stopper body is made of sheet metal, and includes a substrate portion, a swash plate portion bent upward by a predetermined angle from the substrate portion, and an abutting side portion bent from the swash plate portion. And the front-end | tip of the said contact side part is contact-locked by the circumferential direction one end edge part of the said opening for a latching.

The abutting side portion is inclined upward with respect to the rotation plane.
In this case, it is preferable that the inclination angle of the abutting side portion with respect to the rotation plane is set within a range of 0 ° to 20 °. That is, when the angle is 20 ° or more, the abutting side portion can easily ride on the upper surface portion of the upper limit fixing stopper body, and when the angle is 0 ° or less (horizontal or downward), the abutting side portion is the upper limit fixing stopper body. Operation failure such as surface contact with the lower surface and solidification and noise are likely to occur.

  In another preferable aspect, the planar view length of the abutting side portion is longer than the circumferential length of the locking opening.

  In the electric flow control valve according to the present invention, the abutting side portion of the upper limit movable stopper body is inclined upward (within a range of 0 ° to 20 °) with respect to the rotation plane. However, it is difficult to ride on the upper surface portion of the upper limit fixing stopper body. Therefore, the upper limit fixed stopper body and the upper limit movable stopper body are less likely to be deformed and damaged. It becomes difficult to occur and durability and reliability can be improved.

  Further, by making the plan view length of the abutting side portion longer than the circumferential length of the locking opening of the upper limit fixing stopper body, the tip end portion of the abutting side portion of the upper end fixing stopper body can be Before riding on the upper surface part, the rear end side of the abutting side part contacts the lower surface of the upper limit fixing stopper body. The tip of the abutting side portion can be securely abutted and locked by the locking opening of the upper limit fixing stopper body.

Hereinafter, an embodiment of an electric flow control valve of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are a partially cutaway perspective view and a longitudinal sectional view showing a main part of an embodiment of an electric flow control valve according to the present invention, respectively. Note that the basic configuration of the electric flow control valve 10 of the present embodiment is substantially the same as that described in Patent Documents 1 and 2, and therefore, the differences will be mainly described here.

  In the electric flow control valve 10 of this embodiment, a valve shaft 15, a rotor 12, and a sleeve 13 that constitutes the inner periphery of the rotor 12 are integrally coupled, and a dish on the top of the rotor 12 (sleeve 13). The spring 16, the upper limit movable stopper body 50, and the C-type retaining ring 17 are sequentially stacked and fixed together.

  An upper limit fixing stopper body 30 is disposed and fixed on the inner periphery of the can 20 near the top 21. The upper limit fixing stopper body 30 is inserted into the inner periphery near the top portion 21 of the can 20 and then fixed to the can 20 by hemispherical recessed portions 22 formed at, for example, four places by punching or the like.

  The upper limit fixing stopper body 30 is made of, for example, sheet metal and has a reverse frying pan shape as shown in FIG. 4. An insertion hole 31 through which the upper end portion of the valve shaft 15 is inserted is formed at the center of the upper surface portion 32. At the same time, four fan-shaped or arc-shaped locking openings 35 are arranged at 90 ° intervals on the outer peripheral side of the upper surface portion 32. Here, the rotor 12 (including the upper limit movable stopper body 50 and the like) is raised while rotating in the direction of arrow P in FIGS. 3, 4A, and 5A. The upper limit movable stopper body 50 is locked by one end edge 35a of the circumferential direction 35 (located on the front side along the rotational direction P).

  In addition, in order to ensure the rigidity, strength, shape stability, etc. of the upper limit fixing stopper body 30, two locking openings that are separated from each other by 180 ° from the outer diameter φa (here, 23 mm, for example) of the upper surface portion 32. It is desirable that the distance 35 between the outer peripheral ends of the surface 35 is reduced to some extent and the edge width i of the upper surface portion is set to 1 mm or more.

  On the other hand, the upper limit movable stopper body 50 is made of, for example, a sheet metal, and as shown in FIG. 5, as shown in FIG. 5, a substantially annular substrate portion 52 having an insertion hole 51 fitted on the sleeve 13, and the substrate portion 52. A swash plate portion 54 folded from the upper side by a predetermined angle α (originally a part of the substrate portion 52 is arcuate in plan view), an abutting side portion 55 bent from the swash plate portion 54, The front end 55a of the abutting side 55 is locked by the circumferential end edge 35a of the locking opening 35 (see FIGS. 3 and 6).

  Here, in the present embodiment, the abutting side portion 55 is inclined upward by a predetermined angle β with respect to the rotation plane (horizontal plane). In this case, the inclination angle of the abutting side 55 with respect to the rotation plane (horizontal plane) is preferably set within the range of 0 ° to 20 °. That is, when the angle is 20 ° or more, the abutting side portion 55 can easily ride on the upper surface portion 32 of the upper limit fixing stopper body 30, and when the angle is 0 ° or less (horizontal or downward), the abutting side portion 55 is the upper limit. Operation failure and noise, such as surface contact with the lower surface of the fixed stopper body 30 and solidifying, are likely to occur.

  In the electric flow control valve 10 of the present embodiment configured as described above, the abutting side portion 55 of the upper limit movable stopper body 50 is inclined upward (from 0 ° to 20 °) with respect to the rotation plane (horizontal plane). The contact side portion 55 is difficult to ride on the upper surface portion 32 of the upper limit fixing stopper body 30. For this reason, the upper limit fixed stopper body 30 and the upper limit movable stopper body 50 are less likely to be deformed and damaged, and the abutting side portion 55 is brought into surface contact with the lower surface of the upper limit fixed stopper body 30 to be consolidated. Defects and noise are less likely to occur, and durability and reliability can be improved.

  On the other hand, as shown in FIG. 7, for example, eight locking openings 35 are provided in the upper limit fixing stopper body 30 (the circumferential length La of the locking openings 35 is shorter than that in the four cases). Further, by making the plan view length Lb of the abutting side portion 55 longer than the circumferential length La, the tip end portion of the abutting side portion 55 is brought into contact with the upper surface portion 32 of the upper limit fixing stopper body 30 at the time of ascent. Prior to riding, the rear end side of the abutting side portion 55 contacts the lower surface of the upper limit fixing stopper body 30, so that it is possible to prevent the abutting side portion 55 from riding on the upper surface portion 32 of the upper limit fixing stopper body 30. Thus, the front end 55a of the abutting side 55 can be reliably locked by the locking opening 35 (the end edge 35a) of the upper limit fixing stopper 30.

The partial notch perspective view which shows the principal part of one Embodiment of the electric flow control valve which concerns on this invention. It is a longitudinal cross-sectional view which shows the principal part of one Embodiment of the electric flow control valve which concerns on this invention. The top view with which it uses for description of operation | movement of the upper limit fixed stopper body and the upper limit movable stopper body, an effect | action, and an effect. The fixed stopper body for upper limits is shown, (A) is a top view, (B) is BB arrow sectional drawing of (A). The movable stopper body for upper limits is shown, (A) is a top view, (B) is a side view. The top view with which it uses for description of operation | movement of the upper limit fixed stopper body and the upper limit movable stopper body, an effect | action, and an effect. The figure which shows the other example of the fixed stopper body for upper limits, and the movable stopper body for upper limits. Explanatory drawing explaining operation | movement, an effect | action, an effect, and a problem of the conventional fixed stopper body for upper limits, and the movable stopper body for upper limits.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric flow control valve 12 Rotor 15 Valve shaft 20 Can 30 Upper limit fixed stopper body 35 Locking opening 50 Upper limit movable stopper body 54 Swash plate part 55 Contact side part

Claims (3)

A valve body provided with a valve chamber having a valve seat, a valve shaft having a valve body that contacts and separates from the valve seat, a can joined to the valve body, and an inner circumference of the can A rotor integrally attached to the valve shaft, a stator disposed on the outer periphery of the can for rotationally driving the rotor, and an inner periphery near the top of the can to determine the rising limit of the rotor An electric flow control valve comprising a fixed upper limit fixed stopper body and an upper limit movable stopper body attached to the top of the rotor,
The upper limit fixing stopper body has an inverted frying pan shape, and a plurality of fan-shaped or arc-shaped locking openings are arranged and formed on the upper surface thereof with a predetermined angular interval, and one circumferential end edge of each locking opening The upper limit movable stopper body is contacted and locked,
The upper limit movable stopper body is made of sheet metal, and includes a substrate portion, a swash plate portion bent upward by a predetermined angle from the substrate portion, and an abutting side portion bent from the swash plate portion. And the front end of the abutting side portion is contacted and locked by a circumferential one end edge of the locking opening,
The electric flow control valve according to claim 1, wherein the abutting side portion is inclined upward with respect to a rotation plane.   2. The electric flow control valve according to claim 1, wherein an inclination angle of the contact side portion with respect to a rotation plane is set in a range of 0 ° to 20 °.   The electric flow control valve according to claim 1 or 2, wherein a length in plan view of the abutting side portion is longer than a circumferential length of the locking opening.

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