JP2015086996A - Electric drive valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric drive valve capable of reducing abnormal noise occurring when a fluid is flowed at an extremely low differential pressure in a second flow direction.SOLUTION: An electric valve includes: a valve body 5 where a valve chamber 7 is defined therein, a first opening 11a opening to the valve chamber 7 is formed at a side part, and a second opening 12a opening to the valve chamber 7 is formed at a bottom part, the valve body 5 where a valve seat member 8 having a valve port 9 and a valve seat 8a is fastened to the second opening 12a; a valve body 20 which is disposed in the valve chamber 7 so as to move up and down; and a lifting drive part 50 which moves up and down the valve body 20 relative to the valve seat 8a. A fluid guide wall 4 is erected in at least a part of an outer periphery of the valve seat 8a along a lifting direction of the valve body 20.

Description

  The present invention relates to an electrically driven valve, and more particularly to an electrically driven valve such as an electric valve or an electromagnetic valve used in a heat pump air conditioning system or the like.

  Conventionally, the development of a motor-operated valve aimed at miniaturization, 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 a force acting in the valve closing direction is made as small as possible and a valve-opening spring having a smaller spring load can be used. Yes.

  The motor-operated valve disclosed in Patent Document 1 includes a valve chamber, a first lateral inlet / outlet opening in the valve chamber, a valve port with a vertical valve seat opening in the valve chamber, and a second connected to the valve port. A valve body having an inlet / outlet; a valve body disposed in the valve chamber so as to be movable up and down in order to open and close the valve opening; an elevating drive means having an electric motor for raising and lowering the valve body; and the valve body A valve opening spring that biases the valve in the valve opening direction, and the diameter of the valve port and the diameter of the back pressure chamber defined above the valve body are set to be substantially the same, and the valve A pressure equalization passage having a lower end surface opened to allow communication between the valve opening and the back pressure chamber is provided in the body, and a value obtained by dividing a lower end opening area of the pressure equalization passage by the valve opening area is within a predetermined range. The dimension of each part is set so that it may become.

JP 2013-130271 A

  By the way, in this kind of motor operated valve, the fluid (refrigerant) is bi-directional between the first flow direction from the first inlet / outlet to the second inlet / outlet and the second flow direction from the second inlet / outlet to the first inlet / outlet. However, when a fluid is flowed in the second flow direction with an extremely low differential pressure, the outer periphery of the valve seat of the valve seat member in which the valve seat with the valve seat is formed (particularly the valve seat on the side away from the first inlet / outlet) There is a problem that vortices are generated from the vicinity of the outer edge of the upper end of the member, and turbulent flow is generated between the valve seat member and the valve body, resulting in abnormal noise.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrical device capable of reducing noise generated when a fluid flows in the second flow direction with an extremely low differential pressure. It is to provide a drive valve.

  As a result of diligent research, the present inventors have designed the shape of the valve seat member appropriately so that a fluid flows in the second flow direction with an extremely low differential pressure in an electrically driven valve such as an electric valve or a solenoid valve. It has been found that abnormal noise generated in the case can be effectively reduced.

  That is, in order to solve the above-described problem, the electrically driven valve according to the present invention has a valve chamber defined therein, a first opening that opens to the valve chamber is formed in a side portion, and the valve is formed in a bottom portion. A valve body having a second opening formed in the chamber and a valve seat member having a valve opening and a valve seat opening in the valve chamber fixed to the second opening; An electrically driven valve comprising a valve body that has been made and an elevating drive unit that elevates and lowers the valve body relative to the valve seat, wherein at least a part of the outer periphery of the valve seat has an elevating direction of the valve body A fluid guide wall is erected along the line.

  In a preferred embodiment, the fluid guide wall is provided on a half of the outer periphery of the valve seat that is separated from the first opening of the valve body, or is provided on the entire outer periphery of the valve seat. It is characterized by.

  In a further preferred form, the fluid guide wall is characterized in that its height decreases toward the first opening of the valve body.

  According to the electrically driven valve of the present invention, the fluid guide wall is erected along at least a part of the outer periphery of the valve seat of the valve seat member along the ascending / descending direction of the valve body. 2 When fluid flows in the flow direction, vortex generation starting from the outer periphery of the valve seat of the valve seat member, particularly the vicinity of the outer edge of the upper end of the valve seat member, can be suppressed. Generation of turbulent flow can be suppressed, and abnormal noise generated in the electrically driven valve can be effectively reduced.

The longitudinal cross-sectional view which shows the valve closing state of Embodiment 1 of the electrically operated valve as an electrically driven valve which concerns on this invention. The longitudinal cross-sectional view which shows the valve opening state of the motor operated valve shown in FIG. The notch perspective view which notches and shows an upper part so that the inside of the motor operated valve shown in FIG. 1 can be visually recognized. It is a figure which shows the valve seat member of the electrically operated valve shown in FIG. 1, Comprising: (a) is a perspective view, (b) is a front view, (c) is a side view. The figure which shows the experimental result which measured the presence or absence of abnormal noise at the time of valve opening of the electrically operated valve by a conventional structure. The figure which shows the experimental result which measured the presence or absence of abnormal noise at the time of valve opening of the motor operated valve shown in FIG. The longitudinal cross-sectional view which shows the valve closing state of Embodiment 2 of the electrically operated valve as an electrically driven valve which concerns on this invention. The longitudinal cross-sectional view which shows the valve opening state of the motor operated valve shown in FIG. It is a figure which shows the valve seat member of the electrically operated valve shown in FIG. 7, Comprising: (a) is a perspective view, (b) is a front view.

  Embodiments of an electrically driven valve according to the present invention will be described below with reference to the drawings. In the following, a mode in which an electric valve is used as an electrically driven valve will be described, but it is needless to say that an electromagnetic valve or the like may be used.

[Embodiment 1]
FIG. 1 is a longitudinal cross-sectional view of Embodiment 1 of a motor-operated valve as an electrically driven valve according to the present invention, and FIG. 2 is a longitudinal cross-sectional view showing a valve opening state of the motor-operated valve shown in FIG.

  The illustrated motor-operated valve 1 is used as, for example, an expansion valve in a heat pump air conditioning system or the like, and fluid (refrigerant) flows in both directions (the first flow direction and the opposite second flow direction), and at least in one direction. Is a two-way flow type motor-operated valve corresponding to a flow path through which a large flow rate flows.

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

  The tubular base 6 of the valve body 5 has a valve chamber 7 defined therein, and a lateral first opening 11a that opens to the valve chamber 7 is formed on the side thereof, and the valve chamber 7 is formed on the bottom thereof. A vertically extending second opening 12a is formed. A stepped valve seat member 8 having a vertically oriented valve opening 9 and a valve seat 8a that opens to the valve chamber 7 is fixed to the second opening 12a formed at the bottom of the cylindrical base 6 of the valve body 5. ing. A lateral conduit joint 11 is attached to the first opening 11 a formed on the side of the cylindrical base 6, and the connection port 12 b has a larger diameter than the valve port 9 formed on the bottom 8 c side of the valve seat member 8. Further, a vertical duct joint 12 communicating with the valve port 9 of the valve seat member 8 is attached.

  More specifically, the stepped valve seat member 8 has a bottom portion 8c fitted into the second opening 12a and fixed to the cylindrical base body 6 of the valve body 5, and the connection formed on the bottom portion 8c side. The conduit joint 12 is fitted and attached to the opening 12b. Further, an inclined surface 8b connected to the valve seat 8a is formed at the upper end portion of the valve seat member 8, and the upper end of the inclined surface 8b is near the center of the conduit joint 11 attached to the first opening 11a or the conduit joint. The valve seat member 8 and the conduit joint 11 are disposed so as to be positioned slightly below the center of the cylinder 11. Further, a slightly flat surface 8d is formed on the upper end portion of the valve seat member 8 from the upper end of the inclined surface 8b to the outside. The outer edge of the flat surface 8d, that is, the outer periphery of the valve seat 8a, is the valve seat member. A fluid guide wall 4 is erected on the outer edge of the upper end side of 8 along the ascending / descending direction (vertical direction) of the valve body 20. As shown in FIGS. 3 and 4, the fluid guide wall 4 is a half portion of the outer periphery of the valve seat 8 a that is separated from the first opening 11 a of the valve body 5 (the center of the valve body 5 with respect to the center axis L). Provided on the opposite side of the first opening 11a), the height of the valve body 5 decreases linearly toward the first opening 11a when viewed in side view. Here, the inclination angle θ of the upper surface of the fluid guide wall 4 with respect to the flat surface 8d (horizontal plane) of the valve seat member 8 can be appropriately designed, but it is preferable that the inclination angle θ is approximately 30 to 35 degrees. Have been confirmed by numerical analysis. The fluid guide wall 4 has a thickness that is approximately half the radial width of the flat surface 8 d of the valve seat member 8.

  The thickness of the fluid guide wall 4 can be appropriately designed as long as the fluid guide wall 4 has a rigidity capable of withstanding the pressure of the fluid flowing through the valve chamber 7. For example, the fluid guide wall 4 is tapered upward to ensure a flow rate. You may form so that it may become. Further, the height of the fluid guide wall 4 may be formed to be curvilinearly lowered toward the first opening 11a side of the valve body 5, or a part having a certain height is formed in a part thereof. May be. Further, the fluid guide wall 4 may be formed integrally with the valve seat member 8 as shown in the figure. For example, the fluid guide wall 4 may be formed separately from the valve seat member 8 and welded to the outer periphery of the valve seat 8a. You may join to the upper part of 8 or the circumference | surroundings.

  As shown in FIGS. 1 and 2, a stepped cylindrical base 13 is attached to the upper opening of the cylindrical base 6 of the valve main body 5. A 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. Further, the support member 19 includes a cylindrical holding member 14 with a partition wall 14c and a bearing member 15 with a female screw 15i. The cylindrical holding member 14 is fixed inside the cylindrical base 13 by press-fitting or the like. A cylindrical female screw bearing member 15 in which a female screw 15 i is screwed below the inner peripheral surface is fixed to the upper portion of the holding member 14 by caulking or the like. A protruding portion 15a is formed on the center side of the lower surface of the bearing member 15 with the female screw, and a female screw 15i is also screwed to the protruding portion 15a. Further, a spring chamber 14a is defined between the partition wall 14c of the cylindrical holding member 14 and the bearing member 15 with the female thread, and a valve opening spring for urging the valve body 20 in the valve opening direction is accommodated in the spring chamber 14a. ing.

  In addition, the valve body 20 includes a truncated cone-shaped valve body portion 20a that contacts and separates from the valve seat 8a of the valve seat member 8 to open and close the valve port 9, and a valve body having an inner diameter smaller than that of the valve body portion 20a. And an upper portion of the valve body 20b is slidably inserted into a valve body guide hole 14b below the partition wall 14c in the cylindrical holding member 14. A fitting hole 20d is formed in the central portion of the upper portion of the valve body 20b to which the small diameter lower portion 23c of the thrust transmission member 23 is fitted and fixed.

  On the other hand, the stepping motor 50 is disposed inside a can 58 so as to be rotatable with respect to the can 58 and a rotor support member 56. And a rotor 57 fixed inside the upper portion. The stator 55 is externally fixed to the can 58. Further, on the inner peripheral side of the rotor 57, a sun gear 41 formed integrally with the rotor support member 56, and a fixed ring gear 47 fixed to the upper end of the cylindrical body 43 fixed to the upper part of the cylindrical holding member 14. A planetary gear 42 that is disposed between the sun gear 41 and the fixed ring gear 47 and meshes with each other, a carrier 44 that rotatably supports the planetary gear 42, and a bottomed ring shape that meshes with the planetary gear 42 from the outside. Output gear 45, and a strange planetary gear type speed reduction mechanism 40 including an output shaft 46 and the like whose upper portion is fixed by press-fitting into a hole formed at the bottom of the output gear 45. 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 that is inserted through the central portion of the sun gear 41 (rotor support member 56) and the carrier 44 is inserted into the hole. The upper portion of the support shaft 49 has an outer diameter that is substantially the same as the inner diameter of the can 58, and is formed in a hole formed at the center of the support member 48 that is disposed on the upper side of the rotor support member 56 and inscribed in the can 58. It is inserted. The rotor 57 itself does not move up and down inside the can 58 by the support member 48 or the like, and the positional relationship with the stator 55 that is externally fitted and fixed to the can 58 is always maintained constant.

  The lower part of the output shaft 46 of the speed reduction mechanism 40 is rotatably inserted into the upper part of the cylindrical female screw bearing member 15 that constitutes the support member 19 that supports the output shaft 46 and the like. A slit-like fitting portion 46a extending in the lateral direction so as to pass through the center thereof is formed. A plate-like portion 17c protrudes from the upper end of the rotary elevating shaft 17 on which a male screw 17a screwed with a female screw 15i screwed on the lower side of the inner peripheral surface of the bearing member 15 with the female screw is provided. A slit-like fitting portion 46a is slidably fitted. When the output shaft 46 rotates according to the rotation of the rotor 57, the rotation of the output shaft 46 is transmitted to the rotary elevating shaft 17, and the rotary elevating shaft 17 is driven by screw feed of the female screw 15 i of the bearing member 15 and the male screw 17 a of the rotary elevating shaft 17. Moves up and down while rotating.

  A stepped cylindrical thrust transmission member 23 is disposed below the rotary elevating shaft 17 so as to transmit the thrust downward of the rotary elevating shaft 17 via the ball 18 and the ball seat 16. In addition, by interposing the ball 18 between the rotary lift shaft 17 and the thrust transmission member 23, for example, even if the rotary lift shaft 17 descends while rotating, the rotary lift shaft 17 moves downward to the thrust transmission member 23. Only thrust is transmitted, not rotational force.

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

  As described above, the small-diameter lower portion 23c of the thrust transmission member 23 is fitted and fixed in the fitting hole 20d of the valve body 20 by press fitting or the like, and the valve body 20 and the thrust transmission member 23 are moved up and down integrally. 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 the annular groove formed in the upper end portion of the valve body 20 and the valve body guide hole 14b.

  Further, as described above, the valve-opening spring 25 made of a compression coil spring is disposed in the spring chamber 14a above the partition wall 14c of the cylindrical holding member 14 with its lower end in contact with the partition wall 14c. At the same time, in order to transmit the urging force (lifting force) of the valve-opening spring 25 to the valve body 20 through the thrust transmission member 23, a lifting spring receiving body 28 having hook-like hook portions 28a and 28b on the upper and lower sides is arranged. Has been. The upper hooking portion 28 a of the lifting 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. The cylindrical holding member 14 is formed with a communication hole 14d that allows the spring chamber 14a and the can 58 to communicate with each other.

  Therefore, when the rotor 57 of the motor 50 is rotationally driven in one direction, the rotation of the rotor 57 is transmitted to the rotary lift shaft 17 through the output shaft 46 of the speed reduction mechanism 40 and transmitted to the female screw 15i of the bearing member 15 with the female screw. For example, the rotary lift shaft 17 is lowered while being rotated by screw feed by the male screw 17 a of the rotary lift shaft 17, and 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 lift shaft 17. The valve body 20a of the valve body 20 is finally seated on the valve seat 8a and the valve port 9 is closed (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 lift shaft 17 via the output shaft 46 of the speed reduction mechanism 40, and is transmitted by the female screw 15i and the male screw 17a. For example, the rotary lift shaft 17 is raised while being rotated by screw feed, and accordingly, the thrust transmission member 23 and the valve body 20 are pulled up by the urging force of the valve-opening spring 25, and the valve body portion 20a is separated from the valve seat 8a. The mouth 9 is opened (see FIG. 2).

  A back pressure chamber 30 is defined above the valve body 20 and between the pressing member 24 and the partition wall 14c of the cylindrical holding member 14. Further, in the valve body 20, in order to communicate the lower end portion of the valve body 20 with the back pressure chamber 30, the skirt portion 32a, the thick passage portion 32b, and the narrow passage portion 32c (fitted from below) are opened from below. A pressure equalizing passage 32 having a joint hole 20d) is formed, and the narrow passage portion 32c communicates with the back pressure chamber 30 through the through hole 32d and the lateral hole 32e of the thrust transmission member 23. Here, the balance between the push-down force (force acting in the valve closing direction) acting on the valve body 20 and the push-up force (force acting in the valve opening direction) acting on the valve body 20 in the valve-closed state is canceled (the differential pressure is canceled). 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 electric 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 pipe joint 11 to the pipe joint 12 connected to the valve seat member 8 of the second opening 12a) and vice versa (see FIG. 2). When fluid flows in the second flow direction due to the differential pressure, the outer periphery of the valve seat 8a of the valve seat member 8 (particularly the side away from the first opening 11a) by the fluid guide wall 4 standing on the outer periphery of the valve seat 8a. Since the generation of vortices from the vicinity of the outer edge of the upper end of the valve seat member 8 is suppressed, it is possible to effectively reduce abnormal noise generated when the motor-operated valve 1 is opened.

  5 and 6 show an electric valve having a conventional structure in which no fluid guide wall is provided on the outer periphery of the valve seat (see Patent Document 1) and the electric motor shown in FIG. 1 in which the fluid guide wall 4 is erected on the outer periphery of the valve seat 8a. The experimental result which measured the presence or absence of abnormal noise at the time of valve opening of the valve 1 is shown. Here, in FIG.5 and FIG.6, the pole which is the range from 0.05kPa to 1.0kPa lower than 1.0MPa to 2.0MPa in which the differential pressure between the conduit joint 11 side and the conduit joint 12 side is usually used. Whistle blowing when the amount of energization pulse to the stepping motor 50 of the motor-operated valve 1 is changed from 100 pulses (valve opening: minute opening) to 6000 pulses (valve opening: fully opened) under the condition of low differential pressure. Indicates whether or not the sound (abnormal sound) is audible. In FIGS. 5 and 6, “O” indicates that there is no abnormal noise, and “X” indicates that there is a whistling sound (abnormal noise).

  In the case of the motor-operated valve 1 according to the first embodiment shown in FIG. 6, compared with the motor-operated valve having the conventional structure shown in FIG. It can be seen that (condition) was reduced by 70% or more. Accordingly, it was confirmed that the noise generated when the motor-operated valve 1 is opened can be reduced by 70% or more by standing the fluid guide wall 4a on the outer periphery of the valve seat 8a.

  Further, in the motor-operated valve 1 according to the first embodiment, the fluid guide wall 4 is provided in a half portion of the outer periphery of the valve seat 8a that is separated from the first opening 11a of the valve body 5, and the first opening of the valve body 5 is provided. As the height gradually decreases toward the 11a side, the flow rate of the fluid (refrigerant) in the first flow direction and the second flow direction in the valve chamber 7 can be smoothed and the flow rate can be secured. it can.

  In the first embodiment described above, the fluid guide wall 4 has been described as being provided in the half of the outer periphery of the valve seat 8a that is spaced from the first opening 11a of the valve body 5. If the wall 4 is provided on at least a part of the outer periphery of the valve seat 8a, it is possible to suppress the generation of vortices starting from that part, and to suppress abnormal noise generated in the motor-operated valve 1.

[Embodiment 2]
FIG. 7 is a longitudinal sectional view showing a closed state of a motor-operated valve as an electrically driven valve according to a second embodiment of the present invention, and FIG. 8 is a longitudinal sectional view showing a valve-opened state of the motor-operated valve shown in FIG. FIG. The motor-operated valve 1A according to the second embodiment is different from the motor-operated valve 1 according to the first embodiment described above in that the shape of the fluid guide wall provided on the outer periphery of the valve seat of the valve seat member is different. It is almost the same as the valve 1. Therefore, the same code | symbol is attached | subjected about the structure similar to the motor operated valve 1 of Embodiment 1, and the detailed description is abbreviate | omitted.

  In the motor operated valve 1A of the second embodiment, the valve body 20 is moved up and down (vertical direction) on the outer edge of the flat surface 8dA of the valve seat member 8A, that is, on the outer periphery of the valve seat 8aA and on the upper edge side of the valve seat member 8A. As shown in FIG. 9, the fluid guide wall 4 </ b> A erected along the outer periphery of the valve seat 8 a </ b> A is provided on the entire circumference of the valve seat 8 a </ i> A. The height of the fluid guide wall 4A is substantially constant over the entire circumference so that the valve body portion 20aA and the lower portion of the valve body portion 20bA of the valve body 20A are covered with the fluid guide wall 4A in the closed state. It is set (see FIG. 7), and is set so that the lower part of the valve body 20aA of the valve body 20A is covered with the fluid guide wall 4A in the valve open state (see FIG. 8).

  Also in the motor operated valve 1A of the second embodiment, as in the first embodiment described above, the fluid guide wall provided upright on the outer periphery of the valve seat 8aA particularly when a fluid flows in the second flow direction with an extremely low differential pressure. Since 4A suppresses the generation of vortices from the outer periphery of the valve seat 8aA of the valve seat member 8A (particularly in the vicinity of the outer edge on the upper end side of the valve seat member 8A), it is possible to effectively reduce abnormal noise generated in the motor-operated valve 1A. it can. Further, since the fluid guide wall 4A is provided on the entire outer periphery of the valve seat 8aA, the rigidity of the fluid guide wall 4A can be secured, and the vibration of the fluid guide wall 4A due to the fluid flowing through the valve chamber 7A. Can be suppressed and noise generated in the motor-operated valve 1A can be reduced.

  The thickness of the fluid guide wall 4A can be appropriately designed as long as it has rigidity capable of withstanding the pressure of the fluid flowing through the valve chamber 7A. For example, the fluid guide wall 4A is formed so as to taper upward. Also good. Further, the height of the fluid guide wall 4A is, for example, a part or the whole of the fluid guide wall 4A straight toward the first opening 11aA side of the valve body 5A in order to smooth the flow of the fluid (refrigerant) in the valve chamber 7A. You may form so that it may become low in a curve or a curve. Furthermore, the fluid guide wall 4A may be formed integrally with the valve seat member 8A. For example, the fluid guide wall 4A may be formed separately from the valve seat member 8A and welded or the like on the outer periphery of the valve seat 8aA. You may join to the circumference.

  In the above description, the motorized valves of the first and second embodiments are used as expansion valves in, for example, heat pump type air conditioning systems and the like, and are two-way flow type motorized valves in which fluid flows bidirectionally. Needless to say, the motor-operated valve as a general drive valve can be applied to other systems other than the heat pump air-conditioning system, and may be applied to a motor-operated valve in which fluid flows only in one direction. Is natural.

DESCRIPTION OF SYMBOLS 1 Motorized valve 4 Fluid guide wall 5 Valve main body 6 Cylindrical base body 7 Valve chamber 8 Valve seat member 8a Valve seat 8b Inclined surface 8c Bottom part 8d Flat surface 9 Valve port 11 Conduit joint 11a First opening 12 Conduit joint 12a Second opening 13 Tubular base 14 Tubular holding member 14c Bulkhead 15 Tubular bearing member 15i Female screw 17 Rotating lift shaft 17a Male screw 19 Support member 20 Valve body 20a Valve body portion 20b Valve body portion 23 Thrust transmission member 24 Holding member 25 Valve opening spring 30 Back pressure chamber 40 Mysterious planetary gear type reduction mechanism 50 Stepping motor (lifting drive unit)
55 Stator 57 Rotor 58 Can

Claims (5)

A valve chamber is defined inside, a first opening that opens to the valve chamber is formed at a side, a second opening that opens to the valve chamber is formed at a bottom, and an opening to the valve chamber is formed at the second opening. A valve main body to which a valve seat member having a valve opening and a valve seat is fixed, a valve body disposed in the valve chamber so as to be movable up and down, and a lift drive unit that lifts and lowers the valve body with respect to the valve seat An electrically driven valve with
An electrically driven valve characterized in that a fluid guide wall is erected on at least a part of the outer periphery of the valve seat along the ascending / descending direction of the valve body.   2. The electrically driven valve according to claim 1, wherein the fluid guide wall is provided on a half of the outer periphery of the valve seat that is separated from the first opening of the valve body.   The electrically driven valve according to claim 1, wherein the fluid guide wall is provided on the entire outer periphery of the valve seat.   The electrically driven valve according to any one of claims 1 to 3, wherein the fluid guide wall has a height that decreases toward the first opening side of the valve body.   5. The electrically driven valve according to claim 4, wherein the fluid guide wall has a height that decreases linearly toward the first opening side of the valve body.

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