JP6516960B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve, for example, to a motor-operated valve used in a heat pump type air conditioning system and the like.

  BACKGROUND ART Conventionally, development of a motor-operated valve aiming at downsizing, large capacity and power saving has been promoted. As an example of such a conventional motor-operated valve, Patent Document 1 discloses a technique in which the force acting in the valve closing direction is reduced as much as possible, and a valve-opening spring with a smaller spring load can be used. There is.

  The motor-operated valve disclosed in Patent Document 1 includes a valve chamber, a first horizontal inlet / outlet opening to the valve chamber, a vertical valve seat valve opening to the valve chamber, and a second valve train connected to the valve opening. A valve body having an inlet and an outlet, a valve body disposed so as to be movable up and down in the valve chamber to open and close the valve port, an elevation driving means having an electric motor for moving the valve body up and down, the valve body A valve-opening spring for urging the valve in the valve-opening direction, wherein the bore diameter of the valve port and the chamber diameter of the back pressure chamber defined above the valve body are set to be substantially the same; The body is provided with a pressure equalizing passage whose lower end face is opened to communicate the valve port and the back pressure chamber, and a value obtained by dividing the lower end opening area of the pressure equalizing passage by the valve port area is within a predetermined range. The dimensions of each part are set as follows.

JP, 2013-130271, A

  By the way, in the motor-operated valve of this type, the fluid (refrigerant) is bidirectionally in the first flow direction from the first inlet / outlet toward the second inlet / outlet and in the second flow direction from the second inlet / outlet toward the first inlet / outlet. If, for example, a refrigerant (gas refrigerant) consisting of a gas flows in the first flow direction, a pressure equalizing passage is provided along with the occurrence of vortices in the vicinity of the tip (valve body) of the valve body. There is a problem that abnormal noise, which is considered to be air column resonance, occurs inside the cylindrical valve body. Specifically, as shown in FIG. 6, when the refrigerant flows in the first flow direction with a low differential pressure and a relatively large valve opening, or the refrigerant in the first flow direction with a high differential pressure and an extremely small valve opening. It was confirmed by experiments by the present inventors that slight noise is generated slightly from the motor-operated valve when

  This invention is made in view of the said subject, Comprising: The place made into the objective is providing the motor-operated valve which can reduce the noise which arises when a fluid is flowed in a 1st flow direction. is there.

  As a result of earnest research, the present inventors properly designed the internal shape of the cylindrical valve body provided with the pressure equalizing passage to generate noise when fluid flows in the first flow direction in the motor-operated valve. It has been found that it can be effectively reduced.

That is, in order to solve the problems described above, the motor-operated valve according to the present invention includes a valve main body in which a valve chamber is defined inside and a first opening and a second opening are formed in a side portion and a bottom portion; A valve seat member having a valve port opening to the valve chamber and a valve seat and fixed to the second opening of the valve body, a valve body disposed movably in the valve chamber, and the valve body A motor-operated valve including a lift drive unit for moving up and down with respect to the valve seat, wherein the valve body is formed of a cylindrical body opening toward the valve port, and the inner diameter is constant from above in the lift direction. An upper cylindrical portion, and a skirt portion whose inner diameter continuously extends linearly from the lower end of the inner periphery of the upper cylindrical portion toward the valve port, and the central hole of the upper cylindrical portion A lower portion of a cylindrical thrust transmission member for transmitting the thrust of the valve portion to the valve body, and the fitting hole The lower end of the section is set to the valve body for opening and closing the valve port and into contact or away from the said valve seat, in the lifting direction of the valve body, the dimensions of the skirt is longer than the dimension of the upper cylindrical portion It is characterized by

According to the motor-operated valve of the present invention, the valve body is provided with the skirt portion in which the inner diameter is expanded continuously and linearly in the longitudinal cross section toward the valve port of the valve seat member. When refrigerant is allowed to flow, generation of air column resonance in the inside of the cylindrical valve body accompanying vortex generation near the tip (valve body) of the valve body can be suppressed, and abnormal noise generated in the motorized valve Can be effectively reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the valve closing state of Embodiment 1 of the electrically operated valve which concerns on this invention. The longitudinal cross-sectional view which shows the valve open state of the motor operated valve shown in FIG. The longitudinal cross-sectional view which shows the valve closing state of Embodiment 1 of the motor-operated valve which concerns on this invention. The longitudinal cross-sectional view which shows the valve closing state of reference form 2 of the electrically operated valve which concerns on this invention. The longitudinal cross-sectional view which shows the valve closing state of Embodiment 3 of the electrically operated valve which concerns on this invention. The figure which shows the experimental result which measured the presence or absence of the noise at the time of valve opening of the motor-operated valve of conventional structure.

  Hereinafter, an embodiment of a motor-operated valve according to the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a longitudinal sectional view of Embodiment 1 of the motor-operated valve according to the present invention, and FIG. 2 is a vertical cross-sectional view showing an open state of the motor-operated valve shown in FIG.

  The motor-operated valve 1 shown in the figure is used as an expansion valve in, for example, a heat pump type cooling and heating system etc., and a fluid (refrigerant) flows in both directions (first flow direction and second flow direction opposite to that) and at least one way. There is a two-way flow type motor-operated valve corresponding to a flow path in which a large flow rate flows.

  The motor-operated valve 1 mainly includes a valve main body 5 having a cylindrical base 6 made of a sheet metal, a can 58 fixed to the valve main body 5, and an internal space defined by the valve main body 5 and the can 58. A fixedly arranged support member 19, a valve body 20 supported by the support member 19 and arranged so as to be able to move up and down in the internal space, and a stepping motor mounted above the valve body 5 to raise and lower the valve body 20 Lift drive unit 50).

  The cylindrical base 6 of the valve main body 5 has a valve chamber 7 defined therein and a laterally oriented first opening 11a opened to the valve chamber 7 at its side portion. A vertically oriented second opening 12a is formed. A stepped valve seat member 8 having a vertically oriented valve port 9 opening to the valve chamber 7 and a valve seat 8a is fixed to a second opening 12a formed at the bottom of the cylindrical base 6 of the valve body 5 ing. Then, the horizontal conduit fitting 11 is attached to the first opening 11 a formed in the side portion of the cylindrical base 6, and the connection port 12 b having a diameter larger than that of the valve port 9 formed on the bottom 8 c side of the valve seat member 8. A vertically oriented conduit fitting 12 communicating with the valve port 9 of the valve seat member 8 is attached thereto.

  More specifically, the stepped valve seat member 8 has its bottom 8c fitted in the second opening 12a and is fixed to the cylindrical base 6 of the valve main body 5, and the connection formed on the bottom 8c side The conduit fitting 12 is fitted and attached to the port 12b. Further, an inclined surface 8b connected to the valve seat 8a is formed at the upper end of the valve seat member 8, and the upper end 8d of the inclined surface 8b is in the vicinity of the approximate center of the conduit joint 11 attached to the first opening 11a or The valve seat member 8 and the conduit joint 11 are disposed to be located slightly below the center of the conduit joint 11.

  A stepped cylindrical base 13 is attached to the upper opening of the cylindrical base 6 of the valve body 5 so as to reduce its diameter upward. The lower end portion of a cylindrical can 58 having a ceiling portion is joined to the upper end portion of the cylindrical base 13 by welding or the like. The supporting member 19 has a cylindrical holding member 14 with a partition 14c and a bearing member 15 with a female screw 15i, and the cylindrical holding member 14 is fixed to the inside of the cylindrical base 13 by press fitting or the like. At the upper portion of the holding member 14, a cylindrical internally threaded bearing member 15 in which an internal thread 15i is screwed downward to the inner peripheral surface is fixed by caulking or the like. A projecting portion 15a is formed on the center side of the lower surface of the internally threaded bearing member 15, and a female screw 15i is screwed to the projecting portion 15a. Further, a spring chamber 14a is defined between the partition 14c of the cylindrical holding member 14 and the internally threaded bearing member 15, and a valve opening spring 25 for urging the valve body 20 in the valve opening direction is accommodated in the spring chamber 14a. It is done.

  Further, the valve body 20 is formed of a cylindrical body in which a pressure equalizing passage 32 is formed in the central portion along the elevating direction (vertical direction) of the valve body 20, and the upper portion of the valve body 20 is the cylindrical holding member. The valve body guide hole 14b on the lower side of the partition wall 14c at 14 is slidably fitted. The valve body 20 has an upper cylindrical portion (upper cylindrical portion) 20 b having a constant inner diameter from above, and a skirt portion 20 c whose inner diameter continuously spreads toward the valve port 9 of the valve seat member 8. The center hole of the upper cylindrical portion 20 b is a fitting hole 20 d in which the small diameter lower portion 23 c of the thrust transmission member 23 is fitted and fixed, and the lower end portion of the skirt portion 20 c contacts and separates the valve seat 8 a of the valve seat member 8 A substantially frusto-conical valve body portion 20 a that opens and closes the valve port 9 is provided. The inner diameter of the upper cylindrical portion 20b and the inner diameter of the upper end of the skirt portion 20c are the same, so the inner peripheral surface of the upper cylindrical portion 20b is continuously connected to the inner peripheral surface of the skirt portion 20c.

  Here, the inner diameter of the skirt portion 20c of the valve body 20 linearly increases from the lower end of the upper cylindrical portion 20b toward the valve port 9 of the valve seat member 8 when viewed in a side view. It may be increased in a curve (for example, a curve having a parabola or the like which is convex upward or downward) toward the valve port 9 of the seat member 8. In addition, the inclination angle (taper angle) θ of the inner peripheral surface of the skirt portion 20c with respect to the elevation direction when viewed in side view and the height H of the skirt portion 20c in the elevation direction are the wavelength of the fluid that causes noise. It should be designed appropriately in consideration of etc.

  On the other hand, the stepping motor 50 is disposed rotatably inside the can 58 with respect to the stator 55 including the yoke 51, the bobbin 52, the coil 53, the resin mold cover 54, etc., and the can 58. And a rotor 57 fixed to the upper inside. The stator 55 is externally fixed to the can 58. In addition, a sun gear 41 integrally formed on the rotor support member 56 on the inner peripheral side of the rotor 57, and a fixed ring gear 47 fixed on the upper end of the cylindrical body 43 fixed on the upper portion of the cylindrical holding member 14 , A planetary gear 42 disposed between the sun gear 41 and the fixed ring gear 47, a carrier 44 rotatably supporting the planetary gear 42, and a bottomed ring shape meshing with the planetary gear 42 from the outside An output gear 45 and a hole formed at the bottom of the output gear 45 are provided with a wonder planetary gear type reduction mechanism 40 including an output shaft 46 and the like, the upper portion of which is fixed by press fitting or the like. Here, the number of teeth of the fixed ring gear 47 is set to be different from the number of teeth of the output gear 45.

  A hole is formed in the central portion of the upper portion of the output shaft 46, and the lower portion of the support shaft 49 through which the central portion of the sun gear 41 (the rotor support member 56) and the carrier 44 are inserted is inserted. The upper portion of the support shaft 49 has an outer diameter substantially the same as the inner diameter of the can 58, and is formed in a hole formed in the central portion of the support member 48 disposed inscribed in the can 58 above the rotor support member It is inserted. The rotor 57 itself is not moved up and down inside the can 58 by the support member 48 and the like, and the positional relationship with the stator 55 externally fitted and fixed to the can 58 is constantly maintained constant.

  The lower portion of the output shaft 46 of the reduction gear mechanism 40 is rotatably inserted in the upper portion of the cylindrical internally threaded bearing member 15 constituting the support member 19 for supporting the output shaft 46 and the like, and the lower portion of the output shaft 46 is A slit-like fitting portion 46a extending in the lateral direction is formed so as to pass through the center thereof. A plate-like portion 17c is provided on the upper end of the rotary elevating shaft 17 in which a male screw 17a screwed with a female screw 15i screwed below the inner peripheral surface of the female screw bearing member 15 is protruded. It is slidably fitted in the slit-like fitting portion 46a. When the output shaft 46 is rotated according to the rotation of the rotor 57, the rotation of the output shaft 46 is transmitted to the rotary elevating shaft 17 and screwed by the female screw 15i of the bearing member 15 and the male screw 17a of the rotary elevating shaft 17 Goes up and down while rotating.

  Below the rotary elevating shaft 17, a stepped cylindrical thrust transmitting member 23 is disposed, through which the thrust from the rotary elevating shaft 17 is transmitted via the ball 18 and the ball receiving seat 16. In addition, by interposing the ball 18 between the rotary elevating shaft 17 and the thrust transmission member 23, for example, even if the rotary elevating shaft 17 descends while rotating, the rotational lift shaft 17 moves downward from the rotary elevating shaft 17 to the thrust transmission member 23. Only thrust is transmitted, not rotational power.

  The thrust transmission member 23 is an intermediate body portion slidably inserted into the hole formed in the large diameter upper portion 23a into which the ball receiving seat 16 is fitted on the inner periphery and the partition 14c of the cylindrical holding member 14 from above. 23b, a small diameter lower portion 23c having a diameter smaller than that of the intermediate body portion 23b, and inside thereof a vertically oriented through hole 32d constituting the upper portion of the pressure equalizing passage 32 formed in the valve body 20 and a spine to be described later A plurality of lateral holes 32 e opening to the pressure chamber 30 are formed. The upper end opening of the through hole 32 d is closed by the ball receiving seat 16.

  As described above, the small diameter lower portion 23c of the thrust transfer member 23 is fitted and fixed to the fitting hole 20d of the upper cylindrical portion 20d of the valve body 20 by press fitting or the like, and the valve body 20 and the thrust transfer member 23 are integrally formed. Elevated. A pressing member 24 is sandwiched and fixed between the upper end surface of the valve body 20 and the lower end step portion of the intermediate body portion 23b of the thrust transmission member 23 when the small diameter lower portion 23c is press-fitted. A seal member 38 such as an O-ring is mounted between an annular groove formed in the upper end portion of the valve body 20 and the valve body guide hole 14b.

  Further, as described above, in the spring chamber 14a above the partition 14c of the cylindrical holding member 14, the valve opening spring 25 formed of a compression coil spring is disposed with its lower end in contact with the partition 14c. In addition, in order to transmit the biasing force (pull-up force) of the valve-opening spring 25 to the valve body 20 via the thrust transmission member 23, the pull-up spring receiving body 28 having hook shaped hook portions 28a and 28b is disposed. It is done. The upper hooking portion 28 a of the pull-up spring receiver 28 is placed on the upper portion of the valve-opening spring 25, and the lower hooking portion 28 b is hooked on the lower end step portion of the large diameter upper portion 23 a of the thrust transmission member 23. Further, the cylindrical holding member 14 is formed with a communication hole 14 d for communicating the inside of the spring chamber 14 a with the inside of the can 58.

  Therefore, when the rotor 57 of the motor 50 is rotationally driven in one direction, the rotation of the rotor 57 is decelerated and transmitted to the rotary elevating shaft 17 via the output shaft 46 of the reduction mechanism 40, and the female screw 15 i of the female threaded bearing member 15 The screw 18 feeds the screw 17 by the external screw 17a of the rotary shaft 17. The rotary shaft 17 is rotated, for example, lowered while the thrust transmission member 23 and the valve body 20 resist the biasing force of the valve opening spring 25 by the thrust of the rotary shaft 17. Finally, the valve body 20a consisting of the lower end of the skirt 20c of the valve body 20 is seated on the valve seat 8a to close the valve port 9 (see FIG. 1). On the other hand, when the rotor 57 of the motor 50 is rotationally driven in the other direction, the rotation of the rotor 57 is decelerated and transmitted to the rotary elevating shaft 17 via the output shaft 46 of the reduction mechanism 40, and the female screw 15i and the male screw 17a are used. For example, the rotary elevating shaft 17 is rotated by screw feeding and is raised, and accordingly, the thrust transmission member 23 and the valve body 20 are pulled up by the biasing force of the valve opening spring 25 and the valve body 20a is separated from the valve seat 8a. The mouth 9 is opened (see FIG. 2).

  Further, a back pressure chamber 30 is defined between the pressing member 24 and the partition 14 c of the cylindrical holding member 14 above the valve body 20. In the valve body 20, a thick passage having an inner peripheral surface of a skirt portion 20c whose lower end is opened toward the valve port 9 from the lower side so as to connect the lower end portion of the valve body 20 and the back pressure chamber 30. A pressure equalizing passage 32 is formed having a portion 32b and a narrow passage portion 32c (fitting hole 20d) consisting of the inner peripheral surface of the upper cylindrical portion 20b. The narrow passage portion 32c is a through hole 32d of the thrust transmission member 23 and It communicates with the back pressure chamber 30 via the lateral hole 32e. Here, in the valve closed state, the pressing force (force acting in the valve closing direction) acting on the valve body 20 and the lifting force (force acting in the valve opening direction) acting on the valve body 20 are balanced (cancel the differential pressure). Therefore, the diameter of the back pressure chamber 30 and the diameter of the valve port 9 are set to be substantially the same.

  In the motor-operated valve 1 of the first embodiment, when the rotor 57 of the motor 50 is rotationally driven in the other direction to open the valve port 9, the fluid (refrigerant) is connected to the first flow direction (the first opening 11a) Flow direction from the conduit joint 11 to the conduit joint 12 connected to the valve seat member 8 of the second opening 12a) and the opposite second flow direction (see FIG. 2) When the refrigerant (gas refrigerant) flows in the first flow direction, a skirt portion 20c (a portion whose inner diameter changes in the elevating direction) provided on the valve body 20 causes the valve body 20a of the valve body 20 to Since generation | occurrence | production of air column resonance inside the valve body 20 accompanying the vortex generation | occurrence | production of 4 is suppressed, the noise which arises in the motor operated valve 1 can be reduced effectively.

  Specifically, the amount of electrification pulses to the stepping motor 50 of the motor-operated valve 1 is varied from 2200 pulses to 6000 under conditions where the differential pressure between the conduit joint 11 and the conduit joint 12 is low (about 0.01 to 0.015 MPa). Noise generated by the motor-operated valve of the conventional structure when changing to a pulse (corresponding to full opening), or the differential pressure between the conduit joint 11 side and the conduit joint 12 side is high (about 0.7 to 2.0 MPa) In the following, when the energization pulse amount to the stepping motor 50 of the motor-operated valve 1 is changed from 150 pulses to 300 pulses, it is possible to reliably reduce the noise (see FIG. 6) generated in the motor-operated valve of the conventional structure. It confirmed by the experiment by the present inventors.

  In the motor-operated valve 1 of the first embodiment, the inner diameter of the upper cylindrical portion 20b and the inner diameter of the upper end portion of the skirt portion 20c are the same, and the inner peripheral surface of the upper cylindrical portion 20b and the inner peripheral surface of the skirt portion 20c By continuously connecting them, there is also an advantage that the flow of the fluid (refrigerant) in the valve body 20 can be smoothed.

[ Reference Form 1 ]
FIG. 3 is a longitudinal cross-sectional view showing the valve closed state of the first embodiment of the motor-operated valve according to the present invention. Electric valve 1A of this preferred embodiment 1, with respect to the electric valve 1 of Embodiment 1 described above, are different from the inner shape of the valve body, other configurations are substantially similar to the electric valve 1. Therefore, about the structure similar to the motor operated valve 1 of Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

In the motor-operated valve 1A of the first embodiment , the lower cylindrical portion (lower side) has a constant inner diameter in the lower end portion of the valve body 20A, that is, below the skirt portion 20cA continuously provided below the upper cylindrical portion 20bA. A cylindrical portion 20dA is provided, and the lower cylindrical portion 20dA constitutes a valve body portion 20aA that opens and closes the valve port 9A by coming into contact with and separating from the valve seat 8aA of the valve seat member 8A.

Here, in the motor-operated valve 1A of the first embodiment , the height of the upper cylindrical portion 20bA in the elevating direction (vertical direction) is higher than the height of the upper cylindrical portion 20b of the motored valve 1 of the first embodiment described above. The lower cylindrical portion 20dA is provided at the lower end portion of the skirt portion 20cA. Therefore, the height H of the skirt portion 20cA in the elevation direction when viewed from the side is lower than the height in the elevation direction of the skirt portion 20c of the motor operated valve 1 of the first embodiment, and the height H of the skirt portion 20cA in the elevation direction The inclination angle θ of the inner peripheral surface is designed to be larger than the inclination angle of the inner peripheral surface of the skirt portion 20 c of the motor-operated valve 1 according to the first embodiment.

  The pressure equalizing passage 32A formed in the valve body 20A for communicating the lower end portion of the valve body 20A with the back pressure chamber 30A has an inner periphery of a lower cylindrical portion 20dA whose lower end is open toward the valve port 9A from below. It consists of a thick passage portion 32aA consisting of a flat surface, a thick passage portion 32bA consisting of the inner peripheral surface of the skirt portion 20cA, and a narrow passage portion 32cA consisting of the inner peripheral surface of the upper cylindrical portion 20bA. It communicates with the back pressure chamber 30A via the through hole 32dA and the lateral hole 32eA of the transmission member 23A.

Also operated valve 1A of this preferred embodiment 1, as in the first embodiment described above, when a refrigerant composed of gas (gas refrigerant) flows through the first flow direction, the skirt portion provided in the abdomen in the valve body 20A Since 20cA suppresses the occurrence of air column resonance inside the valve body 20A associated with the occurrence of vortices in the vicinity of the valve body portion 20aA of the valve body 20A, it is possible to effectively reduce noise generated in the motor operated valve 1A. .

Further, in the vicinity of the lower end portion of the valve body 20A, for example, the pressure may be lower than the differential pressure chamber 30A above the valve body 20A at the time of valve opening, but in the motor operated valve 1A of this embodiment 1 , the valve A lower pressure than the differential pressure chamber 30A acts upward on the valve body 20A by providing the lower cylindrical portion 20dA at the lower end portion of the body 20A (the portion where the pressure may be lower than that of the differential pressure chamber 30A). Can be avoided. Therefore, when the valve is closed, the pressure (force acting in the valve closing direction) acting on the valve body 20A and the lifting force (force acting in the valve opening direction) acting on the valve body 20A are precisely balanced (cancel the differential pressure) It can be done.

[ Reference Form 2 ]
FIG. 4 is a longitudinal cross-sectional view showing the valve closing state of the reference embodiment 2 of the motor-operated valve according to the present invention. The motor-operated valve 1B of the second embodiment is different from the motor-operated valve 1 of the first embodiment in the internal shape of the valve body, and the other configuration is substantially the same as that of the motor-operated valve 1. Therefore, about the structure similar to the motor operated valve 1 of Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

In the motor-operated valve 1B of the second embodiment, the inner diameter of the upper end of the skirt portion 20cB is larger than the inner diameter of the upper cylindrical portion 20bB, and the inner peripheral surface of the skirt portion 20cB and the inner peripheral surface of the upper cylindrical portion 20bB are substantially horizontal. It is connected via a flat ceiling surface 32fB (substantially perpendicular to the elevating direction).

Here, in the motor-operated valve 1B of the second embodiment , the height of the upper cylindrical portion 20bB in the elevating direction (vertical direction) is higher than the height of the upper cylindrical portion 20b of the motored valve 1 of the first embodiment described above. high. Therefore, the height H of the skirt portion 20cB in the vertical direction when viewed from the side is lower than the height in the vertical direction of the skirt portion 20c of the motor-operated valve 1 of the first embodiment, and the height H of the skirt portion 20cB in the vertical direction The inclination angle θ of the inner peripheral surface is larger than the inclination angle of the inner peripheral surface of the skirt portion 20 c of the motor-operated valve 1 according to the first embodiment described above.

Also in the motor-operated valve 1B according to the second embodiment, as in the first embodiment, when the refrigerant (gas refrigerant) made of gas flows in the first flow direction, the skirt portion 20cB provided on the valve body 20B Since generation of air column resonance in the inside of the valve body 20B accompanied by the vortex generation in the vicinity of the valve body portion 20aB of the valve body 20B is suppressed, it is possible to effectively reduce noise generated in the motor-operated valve 1B.

In the motor-operated valve 1B according to the second embodiment , a substantially horizontal flat ceiling surface 32fB is provided between the upper cylindrical portion 20bB and the skirt portion 20cB, so that the valve body is utilized by utilizing the ceiling surface 32fB. Since 20B can be inserted into the valve guide hole 14bB of the cylindrical holding member 14B by press-fitting or the like, there is also an advantage that the assembly process of the motor-operated valve 1B can be simplified.

[ Reference Form 3 ]
FIG. 5 is a longitudinal sectional view showing the valve closing state of the third embodiment of the motor-operated valve according to the present invention. The motor-operated valve 1C of the third embodiment differs from the motor-operated valve 1 of the first embodiment in the internal shape of the valve body, and the other configuration is substantially the same as that of the motor-operated valve 1. Therefore, about the structure similar to the motor operated valve 1 of Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

In the motor-operated valve 1C according to the third embodiment , the valve body 20C extends from above to the upper cylindrical portion 20bC having a constant inner diameter, along the raising and lowering direction (vertical direction) and toward the valve port 9C of the valve seat member 8C. And a skirt portion 20cC whose inner diameter gradually expands. The center hole of the upper cylindrical portion 20bC is a fitting hole 20dC in which the small diameter lower portion 23cC of the thrust transmission member 23C is fitted and fixed, and the lower end of the skirt portion 20cC contacts and separates the valve seat 8aC of the valve seat member 8C. A substantially frusto-conical valve body portion 20aC is provided to open and close the valve port 9C.

The inner peripheral surface of the skirt portion 20cC has a step-like shape, and the three inner peripheral surfaces of different inner diameters (from the upper side, upper inner peripheral surface 32bc, middle inner peripheral surface 32bbC, lower inner peripheral surface 32baC) and each portion It is comprised from two horizontal surfaces which connect an inner skin. Further, the upper inner circumferential surface 32bcC of the skirt portion 20cC and the inner circumferential surface of the upper cylindrical portion 20bC have a flat ceiling surface 32fB that is substantially horizontal (substantially perpendicular to the elevating direction), as in the second embodiment described above. Connected through.

  Here, the heights of the three portions of the inner peripheral surface (upper inner peripheral surface 32bcC, middle inner peripheral surface 32bbC, lower inner peripheral surface 32baC) constituting the inner peripheral surface of the skirt portion 20cC are substantially the same. Although there are, the heights may be different. Further, the number of portions of the inner peripheral surface constituting the inner peripheral surface of the skirt portion 20cC (corresponding to the number of steps of the inner peripheral surface of the skirt portion 20cC), and the respective inner peripheral surfaces (upper inner peripheral surface 32bcC, middle inner peripheral surface 32bbC) The height, the inner diameter, and the like of the lower inner circumferential surface 32 baC) in the vertical direction may be appropriately designed in consideration of the wavelength of the fluid causing the noise.

  As an example, as shown in FIG. 5, the number of steps on the inner peripheral surface of the skirt portion 20cC is designed to be three, and the lower end of the skirt portion 20cC (the lower end of the lower inner peripheral surface 32baC) is designed from the upper inner peripheral surface 32bcC The height to the upper end is set longer than the wavelength of the fluid that causes abnormal noise in the motor-operated valve 1C, and the height from the lower end of the skirt portion 20cC to the upper end of the middle inner circumferential surface 32bbC It may be set longer than 2 and the height from the lower end of the skirt portion 20cC to the upper end of the lower inner circumferential surface 32baC may be set to be longer than 1⁄4 of the wavelength of the fluid.

  That is, when the number of steps of the inner peripheral surface of the skirt portion 20cC is designed to be n, the height from the lower end of the skirt portion 20cC to the upper end of the inner peripheral surface of the nth step (number of steps counted from above) By setting the wavelength offset from the length of 1 / n of the wavelength, it is possible to effectively suppress the occurrence of air column resonance in each step of the inner peripheral surface of the skirt portion 20cC.

In the electric component valve 1C according to the third embodiment, since it has been confirmed by the present inventors that resonance occurs up to a quarter wavelength of the fluid wavelength causing the abnormal noise, the inner circumferential surface of the skirt portion 20cC The number of stages is designed to be three, but if resonance occurs even at wavelengths longer than that (for example, 1/6 wavelength or 1/8 wavelength), the number of stages is further increased to design the inner circumferential surface of the skirt portion 20cC do it.

In the motor-operated valve 1C according to the third embodiment , as in the above-described first embodiment, when the gas refrigerant (gas refrigerant) flows in the first flow direction, the skirt portion 20cC (lifting and lowering In the motor-operated valve 1C, the occurrence of air column resonance inside the valve body 20C accompanying the vortex generation near the valve body portion 20aC of the valve body 20C is suppressed by the portion where the inner diameter changes stepwise along the direction. It is possible to effectively reduce the abnormal noise that occurs.

In the motor-operated valve 1C according to the third embodiment , for example, when manufacturing the valve body 20C by cutting, the machining process is simplified because the inner diameter of the skirt portion 20cC changes stepwise along the elevating direction. It also has the advantage of being able to

In the above description, the motor-operated valves according to the first embodiment and the first to third embodiments are used as expansion valves in, for example, a heat pump type air conditioning system, and are two-way flow type motor valves in which fluid flows bidirectionally. It goes without saying that the motor-operated valve of the present invention can be applied to other systems other than the heat pump type cooling and heating system, and it is needless to say that the motor-operated valve may be applied to a motored valve in which fluid flows only in one direction. It is.

DESCRIPTION OF SYMBOLS 1 motor-operated valve 5 valve main body 6 cylindrical base 7 valve chamber 8 valve seat member 8a valve seat 8b inclined surface 9 valve port 11 conduit joint 11a 1st opening 12 conduit joint 12a 2nd opening 13 cylindrical base 14 cylindrical holding member 14c Partition wall 15 Cylindrical bearing member 15i Female screw 17 Rotary lift shaft 17a Male screw 19 Support member 20 Valve body 20a Valve body portion 20b Upper cylindrical portion (upper cylindrical portion)
20c Skirt part 20dA lower cylinder part (lower cylinder part)
23 thrust transmission member 24 pressing member 25 opening valve 30 back pressure chamber 32 pressure equalizing passage 32b thick passage portion 32c thin passage portion 40 wonder planetary gear type reduction mechanism 50 stepping motor (lifting and lowering drive portion)
55 Stator 57 Rotor 58 Can

Claims (1)

A valve body having a valve chamber defined therein and having a first opening and a second opening at side and bottom portions, a valve port opening to the valve chamber and a valve seat A motor-operated valve comprising: a valve seat member fixed to the second opening; a valve body disposed so as to be movable up and down in the valve chamber; and a lift drive unit for moving the valve body up and down relative to the valve seat There,
The valve body is a cylindrical body that opens toward the valve port, and from the upper side in the raising / lowering direction, the upper cylindrical portion having a constant inner diameter, and the inner periphery of the upper cylindrical portion toward the valve port And a skirt portion extending in a straight line in a continuous and vertical cross section,
The central hole of the upper cylindrical portion is a fitting hole into which the lower portion of a cylindrical thrust transmission member for transmitting the thrust of the elevation drive unit to the valve body is fitted.
The lower end portion of the skirt portion is a valve body portion that opens and closes the valve port by contacting and separating with the valve seat ,
A motor-operated valve characterized in that the dimension of the skirt portion is longer than the dimension of the upper cylindrical portion in the elevating direction of the valve body .

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