JP7044246B2 - Solenoid valve - Google Patents

Description

The present invention relates to an electric valve suitable for use in a heat pump type air-conditioning system or the like, and more particularly to an electric valve in which problems caused by foreign substances such as metal powder contained in a circulating fluid (refrigerant) are less likely to occur. ..

Conventionally, as an electric valve, a valve body provided with a valve chamber, a plurality of inlets / outlets, a valve seat, a valve opening, etc., a valve body movably distributed in the valve chamber, and the valve body are provided. A screw feed mechanism including, for example, a valve shaft provided with a male screw and a guide stem provided with a female screw for contacting and separating from the valve seat, and a cylindrical can sealed and joined to the valve body. A stepping motor consisting of a rotor rotatably arranged inside the can and a stator arranged outside the can is provided, and the rotation of the rotor is converted into vertical movement of the valve body by a screw feed mechanism. It is known that the flow rate of a fluid (fluid) passing through a valve port is adjusted by changing the lift amount (valve opening degree) of the valve body (see, for example, Patent Document 1).

In such an electric valve, normally, the rotation of the rotor is transmitted to the screw feed mechanism without decelerating (this type is called a direct acting electric valve), but in recent years, in order to increase the sealing pressure, it is necessary to increase the sealing pressure. For example, as seen in Patent Document 2, a planetary gear type speed reduction mechanism is interposed between the rotor and the screw feed mechanism to decelerate the rotation of the rotor and transmit it to the screw feed mechanism. That is, it is known that the pressing force of the valve body against the valve seat is increased (this type is called a gear reduction type electric valve).

Japanese Unexamined Patent Publication No. 2012-17274 Japanese Unexamined Patent Publication No. 2013-130271

However, in the conventional electric valve as described above, when the lift amount of the valve body is very small (slightly opened), foreign substances (metal powder, shavings, abrasives, sludge, etc.) contained in the fluid (refrigerant) are present. When the valve body portion is clogged and the valve is closed from this slightly opened state, there is a problem that a clogged foreign substance is caught between the valve body and the valve seat, and the foreign substance is easily caught and the valve leaks easily.

In particular, in a gear reduction type motorized valve that increases the pressing force of the valve body against the valve seat, when a foreign substance is caught between the valve body and the valve seat when the valve is closed, the foreign matter is caught. Since the foreign matter is strongly pressed against the valve seat by the valve body, the valve sheet and the valve body (seal surface) are scratched, dented, etc., and valve leakage is likely to occur.

Therefore, conventionally, when a gear reduction type solenoid valve as described above is used as an emergency isolation valve, for example, two solenoid valves are connected in series to improve safety, but such a measure is used. Considering the incorporation of valves into the system and piping, etc., the cost will increase significantly compared to the case where only one electric valve is required, and foreign matter biting itself may occur, so in terms of cost effectiveness. Not a good idea.

The present invention has been made in view of the above circumstances, and an object thereof is that foreign matter contained in a flowing fluid (refrigerant) is caught between a valve body and a valve seat and strongly pressed against them. It is an object of the present invention to provide a highly reliable electric valve which can be prevented from being damaged, so that the valve seat and the valve body are not scratched or dented, and valve leakage is less likely to occur.

In order to achieve the above object, the electric valve according to the present invention basically has a valve chamber, a valve body provided with a plurality of inlets and outlets, and a valve opening, and the valve chamber for opening and closing the valve opening. A main valve body movably arranged up and down, a tubular can joined to the valve body, a rotor rotatably arranged inside the can, and a stator arranged outside the can. A stepping motor comprising a stepping motor and a screw feed mechanism for converting the rotation of the rotor into vertical movement of the main valve body is provided, and the main valve body is provided with an auxiliary valve body for opening and closing the valve opening. When the main valve body closes the valve port, the sub-valve body closes the valve port before the main valve body, and at least one of the sub-valve body and the valve port is covered with the valve port. After the auxiliary valve body closes the valve opening, a filter for communicating the valve opening and the valve chamber is provided until the main valve body closes the valve opening, and the main valve body is provided with the sub valve body. The valve body is slidable in the vertical direction and is locked and arranged, and the auxiliary valve body is arranged so as to be movable up and down with a predetermined gap in the main valve body and is locked and locked. It has a cylindrical portion having a bleed hole formed of a through hole, and is characterized in that the filter is arranged outside or inside the bleed hole in the cylindrical portion .

In a preferred embodiment, the valve opening of the valve body is provided with a main valve sheet to which the main valve body is contacted and separated and a sub-valve sheet to which the sub-valve body is contacted and separated separately.

In a more preferred embodiment, the main valve body moves up and down in the vertical direction with respect to the main valve seat to open and close the valve opening, and the sub-valve body moves vertically with respect to the sub-valve seat. It moves up and down to open and close the valve opening.

In another preferred embodiment, the valve opening of the valve body is provided with a main valve sheet to which the main valve body is contacted and separated, and the filter having the sub-valve sheet to which the sub-valve body is contacted and separated is fixed. ..

In a more preferred embodiment, a lower outer flange-shaped portion is provided below the cylindrical portion so as to be in contact with and separated from the valve opening.

In a more preferred embodiment, an elastic member that urges the sub-valve body in the valve closing direction by an elastic force is interposed between the sub-valve body and the main valve body.

In a more preferred embodiment, the filter is held in a narrow pressure between the lower outer flange portion and a washer interposed between the elastic member and the auxiliary valve body.

In a more preferred embodiment, the main valve body has a main valve body portion that opens and closes the valve opening, and a strut portion that is connected to the upper side of the main valve body portion, and has a top surface of the main valve body portion. An upper inner flange-shaped hook portion provided on the upper part of the cylindrical portion is arranged between the lower surface of the strut portion so as to be movable up and down and is retractably locked, and the strut portion and the upper inner flange portion are arranged. An elastic member that urges the auxiliary valve body in the valve closing direction by an elastic force is interposed between the hooked portion.

In a more preferred embodiment, a lower outer flange-shaped portion is provided in the lower portion of the cylindrical portion so as to be in contact with and separated from the valve opening, and the filter is provided with the lower outer flange-shaped portion, the elastic member, and the upper inner side. Narrow pressure is held between the washer and the washer interposed between the flange-shaped hook.

In another preferred embodiment, a sealing member is interposed between the main valve body and the sub valve body.

In another preferred embodiment, a planetary gear type speed reduction mechanism is provided between the rotor and the screw feed mechanism.

In the electric valve according to the present invention, the main valve body is provided with a sub-valve body that closes the valve opening before the main valve body. The foreign matter contained inside is blocked by the auxiliary valve body, and when the auxiliary valve body closes from there, the fluid (hydrogen) substantially stops flowing, so the foreign matter gets caught between the main valve body and the main valve seat. Therefore, even if the main valve body is closed and strongly pressed against the main valve seat, the main valve body and the main valve seat are not scratched or dented.

Further, foreign matter may be caught between the auxiliary valve body and the auxiliary valve seat, but the auxiliary valve body is only urged by an elastic member such as an O-ring or the elastic force of the auxiliary valve body itself. Therefore, the pressing force is not so strong, and therefore, the auxiliary valve body and the auxiliary valve sheet are not scratched or dented.

Further, even if a foreign substance is caught between the auxiliary valve body and the auxiliary valve seat and a gap is formed between them, the main valve body is closed, so that valve leakage does not occur.

As described above, according to the present invention, it is possible to prevent a situation in which foreign matter contained in the fluid (refrigerant) is caught between the main valve body and the main valve seat and strongly pressed against them. The valve sheet and valve body can be prevented from being scratched or dented, and as a result, valve leakage can be effectively prevented and the reliability of valve closing can be improved.

Further, in the electric valve according to the present invention, after the auxiliary valve body closes the valve opening on at least one of the auxiliary valve body and the valve opening, until the main valve body closes the valve opening (in other words, the main valve body). After the valve body opens the valve opening, while the auxiliary valve body closes the valve opening), a filter that communicates the valve opening and the valve chamber is provided, so that the fluid (fluid) is provided when the valve is opened. ) Passes through the filter, so that the differential pressure acting on the auxiliary valve body can be canceled, and foreign matter contained in the passing fluid (refrigerator) is captured by the filter, and the foreign matter contained in the fluid (refrigerator) is the main. It is possible to prevent a situation in which the valve body and the main valve seat are caught and strongly pressed against them.

The whole vertical sectional view which shows the fully closed state of 1st Embodiment of the electric valve which concerns on this invention. FIG. 1 is an enlarged vertical sectional view of a main part of the motorized valve shown in FIG. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for the explanation of (1) during the valve closing operation at the time of the first flow. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for the explanation of (2) during the valve closing operation at the time of the first flow. An enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for explaining the completion (fully closed) of the valve closing operation at the time of the first flow. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for explanation during the valve opening operation at the time of the first flow. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for the explanation of the valve closing operation (1) at the time of the second flow. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the first embodiment, which is provided for the explanation of (2) during the valve closing operation at the time of the second flow. The vertical sectional view of the auxiliary valve body shown in FIG. The second embodiment of the motorized valve according to the present invention is shown, and the enlarged vertical sectional view of a main part provided in the explanation of (1) during the valve closing operation at the time of the first flow in the motorized valve of the second embodiment. The enlarged vertical sectional view of the main part provided in the explanation of (2) during the valve closing operation at the time of the first flow in the electric valve of the 2nd embodiment. FIG. 3 is an enlarged vertical sectional view of a main part provided for explaining the completion (fully closed) of the valve closing operation at the time of the first flow in the motorized valve of the second embodiment. FIG. 3 is an enlarged vertical sectional view of a main part of the motorized valve of the second embodiment, which is provided for explanation during the valve opening operation at the time of the first flow. An enlarged vertical sectional view of a main part of another example (fully closed state) of the second embodiment of the motorized valve according to the present invention. An enlarged vertical sectional view of a main part of another example (fully closed state) of the second embodiment of the motorized valve according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is an overall vertical sectional view showing a fully closed state of the first embodiment of the electric valve according to the present invention, and FIG. 2 is an enlarged vertical sectional view of a main part of the electric valve shown in FIG. 3 to 8 are enlarged vertical cross-sectional views of the main parts provided for explaining the configuration and operation of the motorized valves shown in FIGS. 1 and 2.

In this specification, the descriptions indicating the positions and directions such as up / down, left / right, front / back, etc. are added for convenience according to the drawings in order to avoid complicated explanations, and are actually incorporated in the system. It does not always point to the position or direction of.

Further, in each drawing, the gap formed between the members, the separation distance between the members, etc. are larger than the dimensions of each constituent member in order to facilitate understanding of the invention and for convenience in drawing. Or it may be drawn small.

The motorized valve 1 of the illustrated embodiment is suitable for use as an expansion valve in, for example, a heat pump type cooling / heating system, in which a fluid (refrigerant) bidirectionally (first flow direction from side to bottom and from bottom to side). It is designed to flow in the second flow direction). Further, in the motorized valve 1 of the present embodiment, as will be described later, a planetary gear type speed reduction mechanism is interposed between the rotor and the screw feed mechanism to increase the axial force of the main valve body and improve the sealing performance. It has become.

The motorized valve 1 has a valve body 10 having a tubular substrate 10A made of sheet metal, a main valve body 20 arranged so as to be vertically movable in the valve body 10, and the main valve body 20 to move up and down. It includes a stepping motor 50 mounted on the upper side of the valve body 10.

A valve chamber 7 is formed in the tubular substrate 10A of the valve body 10, and a lateral first inlet / outlet (conduit joint) 11 that opens into the valve chamber 7 is attached to a side portion thereof. Further, at the lower end of the tubular substrate 10A (that is, the bottom of the valve chamber 7), a main valve composed of a vertically oriented valve opening 9 that opens into the valve chamber 7 from below and an upper end inner peripheral angle portion of the valve opening 9. A stepped valve seat member 8 (lower outer periphery) on which a sub-valve seat 8b composed of an upper end outer peripheral top of the valve port 9 arranged outside the main valve seat 8a via a seat 8a and an inverted conical base surface 8c is formed. The outer flange-shaped portion provided in the valve seat member 8 is fixed by welding or the like, and a second inlet / outlet (conduit joint) 12 connected to the valve opening 9 is attached to the valve seat member 8.

A stepped tubular base 13 is attached to the upper surface opening of the tubular substrate 10A, and a cylindrical base 13 with a ceiling portion is attached to the upper end of the tubular base 13 to form a part of the stepping motor 50. The lower end of the can 58 is hermetically sealed by welding or the like. A cylindrical holding member 14 with a partition wall 14c is fixed to the inner peripheral side of the tubular base 13 by press fitting or the like, and a bearing member provided with a female screw 15i on the lower inner circumference at the upper portion of the tubular holding member 14. 15 is caulked and locked. Immediately above the partition wall 14c of the tubular holding member 14, there is a spring chamber 14a in which a valve opening spring 25 made of a compression coil spring is housed.

Further, the main valve body 20 has a substantially stepped cylindrical shape, and is a poppet valve that moves up and down in a direction perpendicular to the main valve seat 8a to open and close the valve opening 9. As can be clearly seen with reference to FIG. 2, the main valve body 20 has a slightly larger diameter main valve body portion 20A that opens and closes the valve opening 9 by being brought into contact with and separated from the main valve seat 8a of the valve seat member 8. It is connected to the upper side of the main valve body portion 20A, and the upper portion thereof has a strut portion 20B having a slightly smaller diameter that is slidably fitted into the valve body guide hole 14b below the partition wall 14c in the tubular holding member 14. In this example, the substantially upper half of the small-diameter fitting cylinder portion 21 projecting upward from the main valve body portion 20A (center of the upper surface) is formed in the strut portion 20B made of a cylindrical member, and the lower large-diameter fitting is formed. It is fitted and fixed to the joint hole 22 by press fitting or the like, and the main valve body portion 20A and the strut portion 20B are integrated (that is, can move up and down integrally), and the small diameter fitting cylinder of the main valve body portion 20A is formed. A gap of a predetermined size between the upper surface of the main valve body portion 20A and the lower surface of the strut portion 20B around the lower half portion of the portion 21 (a gap in which the upper inner flange-shaped hook portion 30C described later can move up and down relatively). ) Is formed. An inverted truncated cone-shaped sealing surface 20a that is substantially in line contact with the main valve sheet 8a is provided on the outer peripheral portion of the lower surface of the main valve body portion 20A so as to obtain the required sealing property.

Then, in the present embodiment, the auxiliary valve body 30 for opening and closing the valve port 9 can slide in the vertical direction on the lower outer peripheral side of the main valve body 20 (specifically, the outer peripheral side of the main valve body portion 20A). It is arranged in. That is, as described above, the main valve seat 8a in which the main valve body portion 20A (sealing surface 20a) is brought into contact with and separated from the upper inner peripheral side (corner portion) of the valve seat member 8 (valve port 9) in the valve body 10. Is provided, and separately from the main valve seat 8a via the inverted conical base surface 8c, on the upper outer peripheral side (top) of the valve seat member 8, the sealing surface of the auxiliary valve body 30 (lower outer flange-shaped portion 30B). A sub-valve sheet 8b is provided with the lower surface (in this example, a flat surface perpendicular to the vertical direction) 30a. The sub-valve body 30 has a cylindrical shape with a lower outer flange portion 30B externally and vertically movable (with a predetermined gap) on the lower outer periphery of the main valve body 20 (outer circumference of the main valve body portion 20A). The valve port 9 has a portion 30A, and the lower outer flange portion 30B (sealing surface (lower surface of the lower outer flange portion 30B) 30a) moves up and down in the direction perpendicular to the auxiliary valve seat 8b. Is designed to open and close.

More specifically, as can be clearly seen with reference to FIG. 9, the auxiliary valve body 30 is formed with a fitting hole 30c in which the small diameter fitting cylinder portion 21 is slidably inserted into the ceiling portion. At the same time, the main valve body 20 has a substantially hat-shaped cross section having a diameter slightly larger than that of the main valve body portion 20A. That is, the auxiliary valve body 30 is formed to have an outer diameter slightly larger than that of the main valve body portion 20A, and is externally and vertically movable with a predetermined gap on the outer peripheral side of the main valve body portion 20A. It has a cylindrical portion 30A with a lower outer flange portion 30B whose length is slightly shorter than that of the main valve body portion 20A (in the direction of the axis O), and the ceiling portion (in other words, the cylindrical portion 30A) of the auxiliary valve body 30. The portion extending from the upper end to the outer periphery of the small diameter fitting cylinder portion 21 of the main valve body portion 20A through the gap between the upper surface of the main valve body portion 20A and the lower surface of the strut portion 20B) is the main valve body portion 20A. It is an upper inner flange-shaped hook portion 30C that is locked to the upper surface. Further, between the annular recess 22A provided in the center of the lower surface of the strut portion 20B of the main valve body 20 (that is, the outer periphery of the small diameter fitting cylinder portion 21 of the main valve body portion 20A) and the upper inner flange-shaped hook portion 30C. Contains an O-ring (elastic member) 33 as an urging member that constantly urges the auxiliary valve body 30 downward (in the valve closing direction) (via a washer 32 described later) in a compressed state.

As described above, the sub-valve body 30 is slidable in the vertical direction on the main valve body 20 and is engaged with the ceiling portion (upper inner flange-shaped hook portion 30C) so as to be engaged and disposed. When the valve body 20 is closed from the valve open state, the valve port 9 is closed before the main valve body 20 (in other words, the sealing surface 20a of the main valve body 20 is the valve seat member 8 (valve port 9). ), The size and shape of each part are set so that the sealing surface 30a of the auxiliary valve body 30 is seated on the auxiliary valve seat 8b of the valve seat member 8 (valve port 9) before being seated on the main valve seat 8a. (Detailed later).

Further, in the present embodiment, the cylindrical portion 30A of the auxiliary valve body 30 is provided with a bleed hole 34 formed of, for example, a plurality of (or one) through holes formed at substantially equal angular intervals (FIG. FIG. 9), and a filter 35 made of a cylindrical porous body made of, for example, sintered metal is arranged (exterior) on the outer periphery of the cylindrical portion 30A (the bleed hole 34 in the). In this example, the filter 35 is formed to have a length in the vertical direction (axis O direction) slightly longer than that of the cylindrical portion 30A, and an inner end is formed between the auxiliary valve body 30 and the O-ring 33. A ring-shaped structure that is interposed between the O-ring 33 and the upper inner flange-shaped hook portion 30C (upper surface), and the outer end extends to the outside of the cylindrical portion 30A and is placed on the filter 35 (upper surface). Washers 32 made of thin plates are arranged. The filter 35 exteriord to the cylindrical portion 30A utilizes the elastic force (compressive force) of the O-ring 33 to form the lower outer flange portion 30B (upper surface) and the washer 32 (lower surface of the outer end). It is held under a narrow pressure between and.

The filter 35 has a function of allowing a refrigerant to pass through but not a foreign substance to pass through, and in addition to a porous body such as a sintered metal or a foamed member, a mesh member in which a wire rod is woven in a mesh shape and a plurality of mesh members are used. It can be composed of a laminated body, a plate-shaped member having a plurality of openings, or the like.

As a result, after the auxiliary valve body 30 closes the valve opening 9, until the main valve body 20 closes the valve opening 9 (in other words, after the main valve body 20 opens the valve opening 9, the secondary valve body 20 opens the valve opening 9. While the valve body 30 closes the valve opening 9, the filter 35 provided on the outer periphery of the auxiliary valve body 30 (cylindrical portion 30A) and the auxiliary valve body 30 (cylindrical portion 30A) are provided. Bleed hole 34, gap between the auxiliary valve body 30 (inner circumference of the cylindrical portion 30A) and the main valve body 20 (outer circumference of the main valve body portion 20A), the main valve body 20 (main valve body) A fluid (hydrogen) flows between the valve chamber 7 and the valve port 9 through the portion 20A) and the main valve seat 8a (detailed later).

On the other hand, the stepping motor 50 arranged on the upper side of the valve body 10 (cylindrical substrate 10A) has a two-phase coil portion including a yoke 51, a bobbin 52, a coil 53, a resin mold 54, etc. It has a stator 55 that is externally fitted and fixed, and a rotor 57 that is rotatably arranged in the can 58 and has a rotor support member 56 fixed to the inside of the upper portion thereof. Further, on the inner peripheral side of the rotor 57, a sun gear 41 integrally provided with the rotor support member 56 and a fixing ring fixed to the tip of the tubular body 14d fixed to the upper end of the tubular holding member 14 A gear 47, a planetary gear 42 meshing with the sun gear 41 and a fixed ring gear 47, a carrier 44 rotatably supporting the planetary gear 42, a ring-shaped output gear 45 meshing with the planetary gear 42, and the output. A mysterious planetary gear type speed reduction mechanism 40 composed of an output shaft 46 or the like fixed to the gear 45 is attached. 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.

The lower part of the support shaft 49 is inserted into the hole provided in the upper part of the output shaft 46, and the carrier 44 and the sun gear 41 (rotor support member 56) are inserted into the support shaft 49.

Inside the can 58, a support member 48 having a diameter substantially the same as the inner diameter of the can 58 is arranged between the ceiling portion of the can 58 and the rotor support member 56, and the upper portion of the support shaft 49 is a support member. It is inserted into a hole provided in the center of 48.

The output shaft 46 of the mysterious planetary gear type reduction mechanism 40 is rotatably fitted in the upper part of the bearing member 15, and the rotation of the output shaft 46 is provided on the bearing member 15 and is screwed into the screw 15i. It is transmitted to the rotary vertical movement shaft 17 provided with the screw 17e. A slit-shaped fitting portion 46a is provided in the lower portion of the output shaft 46, and a plate-shaped portion 17a slidably fitted to the slit-shaped fitting portion 46a is projected in the upper portion of the rotary vertical movement shaft 17. When the output shaft 46 rotates, the rotary vertical movement shaft 17 is rotated and moved up and down by the screw feed by the female screw 15i and the male screw 17e.

Below the rotary vertical motion shaft 17, a stepped tubular thrust transmission member 23 in which the downward thrust of the rotary vertical motion shaft 17 is transmitted via the ball 18 and the ball receiving seat 19 is arranged. .. Since the ball 18 is interposed, even if the rotary vertical shaft 17 descends while rotating, only the downward thrust is transmitted from the rotary vertical shaft 17 to the thrust transmission member 23, and the rotational force is the same. Not transmitted.

The thrust transmission member 23 is, in order from the top, a large-diameter upper portion 23a in which the ball seat 19 is fitted on the inner circumference, an intermediate body portion 23b slidably inserted into the partition wall 14c of the tubular holding member 14, and the like. It is composed of a small diameter lower part 23c having a smaller diameter than the intermediate body portion 23b, and inside the through hole 26d constituting the upper part of the pressure equalizing passage 26 described later, and a plurality of lateral holes 26e opening in the back pressure chamber 27 described later. It is provided. The upper end opening of the through hole 26d is closed by the ball receiving seat 19.

The small-diameter lower portion 23c of the thrust transmission member 23 is fitted and fixed to the upper fitting hole 20d of the stepped cylindrical main valve body 20 (strut portion 20B) by press fitting or the like, and is fitted and fixed to the main valve body 20 and the thrust transmission member 23. Can be moved up and down together. The pressing member 24 is sandwiched and fixed between the upper end surface of the main valve body 20 (strut portion 20B) 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. An O-ring and a ring are formed between the holding member 24, the annular groove provided at the upper end of the main valve body 20 (strut portion 20B), and the valve body guide hole 14b of the cylindrical holding member 14. A seal member 29 made of a shaped packing is attached.

Further, in the spring chamber 14a above the partition wall 14c of the tubular holding member 14, a valve opening spring 25 made of a compression coil spring is contracted with its lower end in contact with the partition wall 14c, and the valve opening is performed. A pulling spring receiving body 28 having a flange-shaped hooking portion (upper hooking portion 28a, lower hooking portion 28b) in order to transmit the urging force (pulling force) of the spring 25 to the main valve body 20 via the thrust transmission member 23. Are distributed. The upper hooking portion 28a of the pulling spring receiving body 28 is placed on the valve opening spring 25, and the lower hooking portion 28b is adapted to hook the lower end step portion of the large diameter upper portion 23a of the thrust transmission member 23.

Therefore, in the present embodiment, the screw feed mechanism is configured by the bearing member 15 provided with the female screw 15i and the rotary vertical moving shaft 17 provided with the male screw 17e, and the stepping motor 50 (rotor 57) rotates in one direction. When squeezed, the rotary vertical movement shaft 17 is rotated downward, for example, by the screw feed by the female screw 15i and the male screw 17e, and the thrust transmission member 23 and the main valve body 20 are opened by the thrust of the rotary vertical movement shaft 17. It is pushed down against the urging force of the valve spring 25, and finally the sealing surface 20a of the main valve body portion 20A is pressed against the main valve seat 8a to close the valve opening 9.

On the other hand, when the stepping motor 50 (rotor 57) is rotated in the other direction, the rotary vertical movement shaft 17 is rotated upward by the screw feed by the female screw 15i and the male screw 17e, and the thrust transmission member is moved accordingly. 23 and the main valve body 20 are pulled up by the urging force of the valve opening spring 25, and the sealing surface 20a of the main valve body portion 20A is lifted (raised) from the main valve seat 8a to open the valve opening 9.

A detailed operation description including the auxiliary valve body 30 will be described later.

In the present embodiment, the back pressure chamber 27 is defined above the main valve body 20 between the holding member 24 and the partition wall 14c of the tubular holding member 14. Further, in the main valve body 20 (main valve body portion 20A and strut portion 20B), a stepped pressure equalizing passage 26 for communicating the tip end portion (lower end portion) of the main valve body 20 and the back pressure chamber 27 is provided. Is provided. The pressure equalizing passage 26 communicates with the back pressure chamber 27 together with the vertical hole 26d and the horizontal hole 26e of the thrust transmission member 23 described above. Here, the pushing-down force acting on the main valve body 20 (force acting in the valve closing direction) and the pushing-up force acting on the main valve body 20 (force acting in the valve opening direction) in the valve closed state are balanced (the differential pressure is canceled). ), The chamber diameter Da of the back pressure chamber 27 and the diameter Dc of the valve port 9 are set to be substantially the same.

Next, the opening / closing operation of the motorized valve 1 having the above-mentioned configuration including the auxiliary valve body 30 will be described with reference to FIGS. 2 to 8.

First, as shown in FIGS. 2 and 5, the valve closing operation is completed and the main valve body 20 and the sub-valve body 30 are positioned at the lowest position, that is, the main valve body 20 is seated on the main valve seat 8a. When the auxiliary valve body 30 is seated on the auxiliary valve seat 8b and pressed against the auxiliary valve body 30 and both are closed (when fully closed), the O-ring 33 is pressed against the strut portion 20B of the main valve body 20. A gap La is opened between the lower surface of the strut portion 20B of the main valve body 20 and the upper surface of the upper inner flange-shaped hook portion 30C of the auxiliary valve body 30 by being contracted, and the main valve body portion of the main valve body 20 is opened. A gap Lb is opened between the upper surface of the 20A and the lower surface of the upper inner flange-shaped hooking portion 30C of the auxiliary valve body 30.

On the other hand, as shown in FIG. 3, during the first flow from the side to the bottom, the stepping motor 50 (rotor 57) is rotated in one direction, and the main valve body 20 is lowered with the sub-valve body 30. When it is moving, that is, during the valve closing operation (1) in which both the main valve body 20 and the sub valve body 30 are open, the sub valve body 30 is pushed down by the urging force (elastic force) of the O ring 33. The upper inner flange-shaped hook portion 30C (lower surface) is abutted and locked to the main valve body portion 20A (upper surface), and the lower surface of the strut portion 20B of the main valve body 20 and the upper inner flange-shaped portion of the sub-valve body 30 are contacted and locked. A gap La + Lb is provided between the hook portion 30C and the upper surface thereof.

During this valve closing operation (1), in this example, the lower end of the sub-valve body 30 (lower outer flange portion 30B) is higher than the lower end of the main valve body 20 (main valve body portion 20A). The refrigerant and foreign substances (metal powder, shavings, abrasives, sludge, etc.) contained in the refrigerant and the auxiliary valve body are located along the inverted conical base surface 8c formed at the upper end of the valve seat member 8. It is flowed between 30 and the auxiliary valve seat 8b, and between the main valve body 20 and the main valve seat 8a. In this embodiment, a foreign substance having a size (diameter) of 10 to 300 μm is assumed.

Subsequently, from the state shown in FIG. 3 in which the main valve body 20 is slightly opened and the auxiliary valve body 30 is slightly opened, the main valve body 20 is further lowered as shown in FIG. During the valve closing operation until the auxiliary valve body 30 sits on the auxiliary valve seat 8b and closes the valve (2), that is, the gap formed between the auxiliary valve body 30 and the auxiliary valve seat 8b gradually becomes smaller. When it finally becomes 0, the foreign matter contained in the refrigerant is blocked by the minute gap formed between the auxiliary valve body 30 and the auxiliary valve sheet 8b, and the portion indicated by the E1 arrow in FIG. 4, that is, It accumulates on the upstream side (outer peripheral side) of the minute gap formed between the auxiliary valve body 30 and the auxiliary valve sheet 8b, and tends to be clogged. When the auxiliary valve body 30 is seated on the auxiliary valve seat 8b and the valve is closed, the foreign matter is blocked by the auxiliary valve body 30 and is located on the downstream side (here, the main valve body 20 on the inner peripheral side and the main valve seat 8a side). Stops flowing.

In this way, during the valve closing operation (2) from the slightly opened state to the slightly opened state of the auxiliary valve body 30, the main valve body 20 moves downward from the slightly opened state to the slightly opened state, and the main valve body 20 When the flow rate of the refrigerant passing through the valve gradually decreases and the auxiliary valve body 30 closes, the refrigerant hardly flows and the flow rate becomes substantially 0. However, in this example, a part of the refrigerant (small flow rate). ) Is a filter 35 provided on the outer periphery of the auxiliary valve body 30, a bleed hole 34 provided on the auxiliary valve body 30, and between the auxiliary valve body 30 (inner circumference) and the main valve body 20 (outer circumference). It flows out to the valve port 9 side through a gap, between the main valve body 20 and the main valve seat 8a. However, foreign matter contained in the refrigerant flowing out to the valve port 9 side through the bleed hole 34 or the like during this valve closing operation (2) enters the bleed hole 34 by the filter 35 provided on the outside of the bleed hole 34. It is captured (blocked) and does not flow to the downstream side (here, the main valve body 20 and the main valve seat 8a side on the inner peripheral side).

Subsequently, when the main valve body 20 is further moved downward from the slightly opened state shown in FIG. 4, the sealing surface 20a of the main valve body 20 sits on the main valve seat 8a and closes as shown in FIG. The valve stops the flow of the refrigerant (the flow rate becomes 0). In this case, the main valve body 20 is strongly pressed against the main valve seat 8a by a high axial force due to the mysterious planetary gear type speed reduction mechanism 40. At this time, as described above, the O-ring 33 is compressed by the strut portion 20B of the main valve body 20 by the gap Lb, and the lower surface of the strut portion 20B of the main valve body 20 and the upper inner flange shape of the auxiliary valve body 30 are formed. The gap formed between the upper surface of the hooking portion 30C is only La + Lb to La, and the upper surface of the main valve body portion 20A of the main valve body 20 and the lower surface of the upper inner flange-shaped hooking portion 30C of the sub valve body 30. A gap Lb is opened between the two, and the auxiliary valve body 30 is pressed against the auxiliary valve seat 8b by the urging force (elastic force) of the O-ring 33.

Here, when the sub-valve body 30 is seated on the sub-valve seat 8b and the valve is closed (state shown in FIG. 4), a foreign substance is caught between the sub-valve body 30 and the sub-valve seat 8b. The foreign matter is pressed against the auxiliary valve body 30 and the auxiliary valve seat 8b by the urging force of the O-ring 33 compressed by Lb, but the pressing force is not so strong, and therefore the auxiliary valve body 30 and the auxiliary valve seat There are no scratches or dents on 8b.

Further, at this time, even if the main valve body 20 is closed from the slightly opened state, the foreign matter is blocked by the sub-valve body 30 or the filter 35, and the refrigerant does not substantially flow, so that the main valve body No foreign matter is caught between the 20 and the main valve seat 8a, and therefore, even if the main valve body 20 is strongly pressed against the main valve seat 8a by a high axial force by the mysterious planetary gear type reduction mechanism 40, the main valve There are no scratches or dents on the body 20 or the main valve sheet 8a.

When opening the valve from the fully closed state shown in FIG. 5, the stepping motor 50 (rotor 57) is rotated in the other direction, whereby the main valve body 20 is pulled up as shown in FIG. In this case, when the main valve body 20 is pulled up by the gap Lb, the main valve body 20 is slightly opened from the closed state, whereby the main valve body of the main valve body 20 is slightly opened by the urging force (elastic force) of the O-ring 33. The lower surface of the upper inner flange-shaped hook portion 30C of the sub-valve body 30 is abutted and locked to the upper surface of the portion 20A, and the lower surface of the strut portion 20B of the main valve body 20 and the upper inner flange-shaped hook portion of the sub-valve body 30. The gap formed between the upper surface of the 30C and the upper surface changes from La to La + Lb, and the auxiliary valve body 30 remains closed, but the pressing force by the O-ring (elastic member) 33 becomes smaller.

Further, at this time, as described with reference to FIG. 4, in this example, a part (small flow rate) of the refrigerant is bleeding provided on the filter 35 provided on the outer periphery of the auxiliary valve body 30 and the auxiliary valve body 30. The hole 34, the gap between the auxiliary valve body 30 (inner circumference) and the main valve body 20 (outer circumference), and the main valve body 20 and the main valve seat 8a so as to flow out to the valve port 9 side. Become. Therefore, the pushing-down force acting on the auxiliary valve body 30 (force acting in the valve closing direction) and the pushing-up force acting on the auxiliary valve body 30 (force acting in the valve opening direction) in the valve closed state are balanced (differential pressure is canceled). The pushing force acting on the valve closed sub-valve 30 is further reduced.

When the main valve body 20 is further pulled up from the state shown in FIG. 6, the sealing surface 30a of the sub-valve body 30 is separated from the sub-valve sheet 8b (by the main valve body portion 20A of the main valve body 20), and FIG. As shown, the main valve body 20 is slightly opened and the sub valve body 30 is slightly opened.

The above is the description of the first flow from the side to the bottom, but it is also shown in FIGS. 7 and 8 (states corresponding to FIGS. 3 and 4) even during the second flow from the bottom to the side. As described above, the main valve body 20 is moved downward from the state where the main valve body 20 is slightly opened and the sub-valve body 30 is slightly opened, and is formed between the sub-valve body 30 and the sub-valve seat 8b. When the gap gradually becomes smaller and finally becomes 0, the foreign matter contained in the refrigerant is blocked by the minute gap formed between the auxiliary valve body 30 and the auxiliary valve sheet 8b, and the E2 arrow in FIG. The minute portion formed between the sub-valve body 30 and the sub-valve seat 8b at the portion indicated by, that is, on the downstream side (outer peripheral side) of the gap formed between the main valve body 20 and the main valve seat 8a. It collects on the upstream side (inner circumference side) of the gap and becomes clogged.

During the valve closing operation (2) from the slightly opened state to the slightly opened state of the auxiliary valve body 30, the main valve body 20 moves downward from the slightly opened state to the slightly opened state and passes through the main valve body 20. When the flow rate of the refrigerant gradually decreases and the auxiliary valve body 30 is closed, the refrigerant hardly flows. Further, a part of the refrigerant (small flow rate) is a gap between the main valve body 20 and the main valve seat 8a, a gap between the sub-valve body 30 (inner circumference) and the main valve body 20 (outer circumference), and a sub. Since it flows out to the valve chamber 7 side through the bleed hole 34 provided in the valve body 30 and the filter 35 provided on the outer periphery of the auxiliary valve body 30, the pushing force acting on the auxiliary valve body 30 (force acting in the valve closing direction). ) And the pushing force acting on the auxiliary valve body 30 (force acting in the valve opening direction) are balanced (differential pressure is canceled), and foreign matter is clogged in the gap between the main valve body 20 and the main valve seat 8a. There is no such thing.

Subsequently, when the main valve body 20 is further lowered from the slightly opened state shown in FIG. 8, the main valve body 20 sits on the main valve seat 8a and closes the valve, and the refrigerant does not flow. At this time, as described above, the O-ring 33 is compressed by the strut portion 20B of the main valve body 20 by the gap Lb, and the lower surface of the strut portion 20B of the main valve body 20 and the upper inner flange shape of the auxiliary valve body 30 are formed. The gap formed between the upper surface of the hooking portion 30C is only La + Lb to La, and the upper surface of the main valve body portion 20A of the main valve body 20 and the lower surface of the upper inner flange-shaped hooking portion 30C of the sub-valve body 30. A gap Lb is opened between the two, and the auxiliary valve body 30 is pressed against the auxiliary valve sheet 8b by the urging force (elastic force) of the O-ring (elastic member) 33.

Here, even during the second flow, when the sub-valve body 30 is seated on the sub-valve seat 8b and the valve is closed (state shown in FIG. 8), foreign matter is contained between the sub-valve body 30 and the sub-valve seat 8b. When bitten between them, the foreign matter is pressed against the auxiliary valve body 30 and the auxiliary valve seat 8b by the O-ring 33 compressed by Lb, but the pressing force is not so strong, and therefore the auxiliary valve body. No scratches, dents, etc. are made on 30 and the auxiliary valve sheet 8b.

Further, at this time, even if the main valve body 20 is closed from the slightly opened state, the refrigerant does not substantially flow, so that foreign matter is caught between the main valve body 20 and the main valve seat 8a. Therefore, even if the main valve body 20 is strongly pressed against the main valve sheet 8a, the main valve body 20 and the main valve sheet 8a are not scratched or dented.

As described above, in the electric valve 1 of the present embodiment, since the auxiliary valve body 30 for closing the valve port 9 before the main valve body 20 is provided on the outer periphery of the main valve body 20, the auxiliary valve body 20 is provided. When the sub-valve 30 is in a slightly open state, foreign matter contained in the fluid (refrigerator) is blocked by the sub-valve body 30, and when the sub-valve 30 is closed from there, the fluid (refrigerator) substantially stops flowing. Foreign matter is not caught between the main valve body 20 and the main valve seat 8a, and therefore, even if the main valve body 20 closes and is strongly pressed against the main valve seat 8a, the main valve body 20 and the main valve body 20 and the main valve body 20 are not caught. The valve sheet 8a will not be scratched or dented.

Further, foreign matter may be caught between the auxiliary valve body 30 and the auxiliary valve seat 8b, but the auxiliary valve body 30 is only urged by the O-ring 33 (elastic force), so that the foreign matter is urged. The pressing force is not so strong, and therefore, the auxiliary valve body 30 and the auxiliary valve sheet 8b are not scratched or dented.

Further, even if a foreign substance is caught between the auxiliary valve body 30 and the auxiliary valve seat 8b and a gap is formed between them, the main valve body 20 is closed, so that valve leakage does not occur.

As described above, in the gear reduction type electric valve 1 of the first embodiment, the rotor 57 and the screw feed mechanism (bearing member 15 provided with the female screw 15i) are provided in order to improve the sealing property and surely prevent the valve leakage. A mysterious planetary gear type deceleration mechanism 40 is interposed between the rotary vertical movement shaft 17) provided with the male screw 17e, and the axial force of the main valve body 20, that is, to the main valve seat 8a of the main valve body 20. In the case where the pressing force is increased, it is difficult for foreign matter contained in the fluid (refrigerator) to be caught between the main valve body 20 and the main valve seat 8a and strongly pressed against them. Therefore, the main valve seat 8a, the sub-valve seat 8b, the main valve body 20, and the sub-valve body 30 can be prevented from being scratched or dented, and as a result, valve leakage is effectively prevented and the valve is closed. The reliability of the can be improved.

Further, in the electric valve 1 of the present embodiment, after the sub-valve body 30 closes the valve port 9 on the outer periphery of the sub-valve body 30, until the main valve body 20 closes the valve port 9 (in other words, the valve port 9 is closed). For example, after the main valve body 20 opens the valve opening 9, while the auxiliary valve body 30 closes the valve opening 9), a filter 35 for communicating the valve opening 9 and the valve chamber 7 is provided. Therefore, when the valve is opened, the fluid (refrigerator) passes through the filter 35, so that the differential pressure acting on the auxiliary valve body 30 can be canceled and foreign matter contained in the passing fluid (refrigerator) is captured by the filter 35. Therefore, it is possible to prevent a situation in which foreign matter contained in the fluid (hydrogen) is caught between the main valve body 20 and the main valve seat 8a and strongly pressed against them.

In the first embodiment, the filter 35 for passing the fluid (refrigerant) and capturing the foreign matter contained in the fluid (refrigerant) is arranged outside the auxiliary valve body 30 (cylindrical portion 30A). However, for example, it may be arranged inside (inner circumference) of the auxiliary valve body 30 (cylindrical portion 30A). Further, although the filter 35 is held and fixed to the auxiliary valve body 30 by using a washer 32, it is needless to say that the method of holding and fixing the filter 35 is not limited to the above form.

[Second Embodiment]
10 to 13 are enlarged vertical sectional views of a main part provided for the configuration and operation explanation of the second embodiment of the motorized valve according to the present invention.

The motorized valve 2 of the second embodiment shown in the figure has substantially the same configuration as the motorized valve 1 of the first embodiment shown in FIGS. 1 to 9, except for the main valve body, the sub-valve body, and the valve opening. .. Therefore, the parts corresponding to the respective parts of the motor-operated valve 1 of the first embodiment and the parts having the same functions are designated by a common reference numeral to omit the duplicate description, and the differences will be mainly described below.

In the motorized valve 2 of the illustrated embodiment, contrary to the motorized valve 1 of the first embodiment, the filter 36 for passing the fluid (refrigerant) and capturing the foreign matter contained in the fluid (refrigerant) is (1). It is provided in the valve opening 9 of the valve seat member 8 (instead of the auxiliary valve body 30).

Specifically, the valve seat member 8 fixed to the lower end portion of the tubular substrate 10A (that is, the bottom portion of the valve chamber 7) is a vertically oriented valve opening 9 opening from the lower side to the valve chamber 7, the valve opening 9. A main valve sheet 8a composed of an upper end inner peripheral angle portion is formed, and a ring having a rectangular cross section made of, for example, sintered metal is formed on an outer peripheral step portion 36a formed on the outer side of the main valve sheet 8a in the valve opening 9. A filter 36 made of a porous body having a shape is fitted and fixed by press fitting or the like, and the upper surface of the filter 36 is brought into contact with and separated from the auxiliary valve body 31 (the sealing surface (lower surface of the lower outer flange portion 31B) 31a). The auxiliary valve seat 8b is used.

Further, in the present embodiment, an auxiliary valve body 31 for opening and closing the valve port 9 is arranged on the lower outer peripheral side of the main valve body 20 (specifically, the outer peripheral side of the main valve body portion 20A). The sub-valve body 31 has a truncated cone-shaped portion 31A with a lower outer flange portion 31B externally inserted (with a predetermined gap) on the lower outer periphery of the main valve body 20 (outer circumference of the main valve body portion 20A). The lower outer flange portion 31B (sealing surface (lower surface of the lower outer flange portion 31B) 31a) moves up and down in the direction perpendicular to the auxiliary valve sheet 8b provided on the filter 36. The valve port 9 is designed to open and close.

More specifically, the auxiliary valve body 31 is made of, for example, a SUS304CSP-3 / 4H material, and is made of an elastic (in other words, elastically deformable) spring plate material that has been annealed for stress relief. Has been done. The sub-valve body 31 is formed to have an outer diameter slightly larger than that of the main valve body portion 20A, is externally inserted with a predetermined gap on the outer peripheral side of the main valve body portion 20A, and has a length in the vertical direction (axis O direction). Has a truncated cone-shaped portion 31A with a lower outer flange-shaped portion 31B slightly shorter than the main valve body portion 20A, and an upper inner flange-shaped locking portion provided (inwardly) at the upper end of the sub-valve body 30. 31C is held and fixed under a narrow pressure between the main valve body portion 20A (outer circumference of the upper surface) and the strut portion 20B (outer circumference of the lower surface) of the main valve body 20. That is, in this example, the auxiliary valve body 31 itself is made of an elastic spring plate material, and the urging member (O-ring or the like) that constantly urges the auxiliary valve body 31 downward (in the valve closing direction) is It is omitted, and the elastic force (elastic repulsive force) of the auxiliary valve body 31 constantly urges the auxiliary valve body 31 (lower outer flange portion 31B) downward (valve closing direction).

Also in this example, as in the electric valve 1 of the first embodiment, the auxiliary valve body 31 closes the valve port 9 before the main valve body 20 when the main valve body 20 is closed from the valve open state. Before the sealing surface 20a of the main valve body 20 is seated on the main valve seat 8a of the valve seat member 8 (valve opening 9), the sealing surface 30a of the auxiliary valve body 30 is the valve seat member 8 (in other words). The dimensions and shape of each part are set so as to be seated on the auxiliary valve seat 8b of the valve port 9) (detailed later).

Further, after the sub-valve body 31 closes the valve port 9, until the main valve body 20 closes the valve port 9 (in other words, after the main valve body 20 opens the valve port 9, the sub-valve (While the body 31 closes the valve opening 9) is provided on the outside of the main valve seat 8a in the valve opening 9, and the auxiliary valve body 31 (lower outer flange portion 31B) is elastically seated. A fluid (hydrogen) flows between the valve chamber 7 and the valve opening 9 through the filter 36, the main valve body 20 (main valve body portion 20A) and the main valve seat 8a (detailed later).

Next, the opening / closing operation of the motorized valve 2 having the above-mentioned configuration including the auxiliary valve body 31 will be described with reference to FIGS. 10 to 13.

First, as shown in FIG. 12, the valve closing operation is completed and the main valve body 20 and the sub-valve body 31 are located at the lowermost position, that is, the main valve body 20 is seated on the main valve seat 8a and pressed. When the auxiliary valve body 31 is seated on the auxiliary valve seat 8b and pressed against the auxiliary valve seat 8b and both are closed (when fully closed), the auxiliary valve body 31 is elastically deformed and its lower outer flange-shaped portion is formed. 31B is pushed upward by the displacement amount Lc from the natural state (also referred to as no load state).

On the other hand, as shown in FIG. 10, during the first flow from the side to the bottom, the stepping motor 50 (rotor 57) is rotated in one direction, and the main valve body 20 is lowered with the sub-valve body 31. During the moving valve closing operation (1), the auxiliary valve body 31 is in a no-load state, so that the lower outer flange portion 31B is affected by the elastic restoring force (elastic repulsive force) of the auxiliary valve body 31 itself. It has been pushed down. During this valve closing operation (1), in this example, the lower end of the sub-valve body 31 (lower outer flange portion 31B) is higher than the lower end of the main valve body 20 (main valve body portion 20A). The refrigerant and foreign substances (metal powder, shavings, abrasives, sludge, etc.) contained in the refrigerant and the auxiliary valve body are located along the inverted conical base surface 8c formed at the upper end of the valve seat member 8. It is flowed between 31 and the auxiliary valve seat 8b, and between the main valve body 20 and the main valve seat 8a.

Subsequently, from the state shown in FIG. 10 in which the main valve body 20 is slightly opened and the auxiliary valve body 31 is slightly opened, the main valve body 20 is further lowered as shown in FIG. During the valve closing operation until the auxiliary valve body 31 sits on the auxiliary valve seat 8b and closes the valve (2), that is, the gap formed between the auxiliary valve body 31 and the auxiliary valve seat 8b gradually becomes smaller. When it finally becomes 0, the foreign matter contained in the refrigerant is blocked by the minute gap formed between the auxiliary valve body 31 and the auxiliary valve sheet 8b, and the portion indicated by the E1 arrow in FIG. 11, that is, It accumulates on the upstream side (outer peripheral side) of the minute gap formed between the auxiliary valve body 31 and the auxiliary valve sheet 8b, and tends to be clogged. When the auxiliary valve body 31 sits on the auxiliary valve seat 8b and closes the valve, the foreign matter is blocked by the auxiliary valve body 31 and moves to the downstream side (here, the main valve body 20 on the inner peripheral side and the main valve seat 8a side). Stops flowing.

In this way, during the valve closing operation (2) from the slightly opened state to the slightly opened state of the auxiliary valve body 31, the main valve body 20 moves downward from the slightly opened state to the slightly opened state, and the main valve body 20 When the flow rate of the refrigerant passing through the valve gradually decreases and the auxiliary valve body 31 is closed, the refrigerant hardly flows and the flow rate becomes substantially 0. However, in this example, a part of the refrigerant (small flow rate). ) Flows out to the valve port 9 side through the filter 36 having the auxiliary valve sheet 8b provided on the outer peripheral portion of the valve port 9, between the main valve body 20 and the main valve sheet 8a. However, the foreign matter contained in the refrigerant flowing out to the valve port 9 side during this valve closing operation (2) is captured (blocked) by the filter 36 having the sub-valve seat 8b on which the sub-valve 31 is seated. It does not flow to the downstream side (here, the main valve body 20 on the inner peripheral side and the main valve seat 8a side).

Subsequently, when the main valve body 20 is further moved downward from the slightly opened state shown in FIG. 11, the sealing surface 20a of the main valve body 20 sits on the main valve seat 8a and closes as shown in FIG. The valve stops the flow of the refrigerant (the flow rate becomes 0). In this case, the main valve body 20 is strongly pressed against the main valve seat 8a by a high axial force due to the mysterious planetary gear type speed reduction mechanism 40. At this time, as described above, the sub-valve body 31 is elastically deformed (with the downward movement of the main valve body 20), and the lower outer flange portion 31B thereof is pushed upward by the displacement amount Lc from the natural state, and the sub-valve body 31 is subordinated. The valve body 31 (lower outer flange portion 31B) is pressed against the sub-valve sheet 8b by the elastic force of the sub-valve body 31 itself.

Here, when the sub-valve body 31 is seated on the sub-valve seat 8b and the valve is closed (state shown in FIG. 11), a foreign substance is caught between the sub-valve body 31 and the sub-valve seat 8b. However, the foreign matter is pressed against the auxiliary valve body 31 and the auxiliary valve seat 8b by the elastic force of the auxiliary valve body 31 itself, but the pressing force is not so strong, and therefore the auxiliary valve body 31 and the auxiliary valve seat 8b are damaged. , No dents, etc.

Further, at this time, even if the main valve body 20 is closed from the slightly opened state, the foreign matter is blocked by the sub-valve body 31 or the filter 36, and the refrigerant does not substantially flow, so that the main valve body No foreign matter is caught between the 20 and the main valve seat 8a, and therefore, even if the main valve body 20 is strongly pressed against the main valve seat 8a by a high axial force by the mysterious planetary gear type reduction mechanism 40, the main valve There are no scratches or dents on the body 20 or the main valve sheet 8a.

When opening the valve from the fully closed state shown in FIG. 12, the stepping motor 50 (rotor 57) is rotated in the other direction, whereby the main valve body 20 is pulled up and opened as shown in FIG. To speak. In this case, the auxiliary valve body 31 (lower outer flange portion 31B) is closed by the elastic restoring force (elastic repulsive force) of the auxiliary valve body 31 itself until the main valve body 20 is pulled up by the displacement amount Lc. However, the pressing force due to the elastic force of the auxiliary valve body 31 itself becomes small.

Further, at this time, as described with reference to FIG. 11, in this example, a part (small flow rate) of the refrigerant is the filter 36 having the auxiliary valve sheet 8b provided on the outer peripheral portion of the valve port 9, and the main valve body. It passes between the 20 and the main valve seat 8a and flows out to the valve port 9 side. Therefore, the pushing-down force acting on the auxiliary valve body 31 (force acting in the valve closing direction) and the pushing-up force acting on the auxiliary valve body 31 (force acting in the valve opening direction) in the valve closed state are balanced (differential pressure is canceled). The pushing force acting on the valve closed sub-valve 31 is further reduced.

When the main valve body 20 is further pulled up from the state shown in FIG. 13, the sub-valve body 31 is pulled up together with the main valve body 20, the sealing surface 31a of the sub-valve body 31 is separated from the sub-valve seat 8b, and the sub-valve is separated. The body 31 also opens.

The above is the description of the first flow from the side to the bottom, but the same operation as the first flow from the bottom to the side is performed in the second flow from the bottom to the side, and FIGS. 7 and 8 are used. It is needless to say in detail that the same action and effect as those in the second flow of the first embodiment described above can be obtained.

As described above, also in the electric valve 2 of the second embodiment, the elastically deformable auxiliary valve body 31 that closes the valve port 9 before the main valve body 20 is provided on the outer periphery of the main valve body 20. Therefore, when the auxiliary valve body 31 is in a slightly open state, foreign matter contained in the fluid (hydrogen) is blocked by the auxiliary valve body 31, and when the auxiliary valve body 31 closes from there, the fluid (refrigerator) is substantially contained. Since the foreign matter does not flow between the main valve body 20 and the main valve seat 8a, even if the main valve body 20 closes and is strongly pressed against the main valve seat 8a, the foreign matter does not flow. The main valve body 20 and the main valve sheet 8a are not scratched or dented.

Further, the foreign matter may be caught between the sub-valve body 31 and the sub-valve seat 8b, but the sub-valve body 31 is only urged by the elastic force of the sub-valve body 31 itself. The pressing force is not so strong, and therefore, the auxiliary valve body 31 and the auxiliary valve sheet 8b are not scratched or dented.

Further, even if a foreign substance is caught between the auxiliary valve body 31 and the auxiliary valve seat 8b and a gap is formed between them, the main valve body 20 is closed, so that valve leakage does not occur.

As described above, even in the gear reduction type electric valve 2 of the second embodiment, foreign matter contained in the fluid (refrigerant) is caught between the main valve body 20 and the main valve seat 8a and is strongly resistant to them. It is possible to prevent the situation of being pressed from occurring, so that the main valve seat 8a, the sub-valve seat 8b, the main valve body 20, and the sub-valve body 31 can be prevented from being scratched or dented, and as a result, valve leakage can occur. It can be effectively prevented and the reliability of valve closure can be improved.

Further, also in the electric valve 2 of the second embodiment, after the auxiliary valve body 31 closes the valve port 9 to the valve port 9 until the main valve body 20 closes the valve port 9 (in other words, the valve port 9 is closed). , While the auxiliary valve body 31 closes the valve opening 9 after the main valve body 20 opens the valve opening 9), a filter 36 for communicating the valve opening 9 and the valve chamber 7 is provided. Therefore, since the fluid (fluid) passes through the filter 36 when the valve is opened, the differential pressure acting on the auxiliary valve body 31 can be canceled, and foreign matter contained in the passing fluid (hydrogen) is captured by the filter 36. It is possible to prevent a situation in which foreign matter contained in the fluid (hydrogen) is caught between the main valve body 20 and the main valve seat 8a and strongly pressed against them.

Further, the motorized valve 2 of the second embodiment has an effect that the number of parts can be reduced and the component configuration can be simplified as compared with, for example, the motorized valve 1 of the first embodiment.

In the examples shown in FIGS. 10 to 13, the urging member (O-ring or the like) that constantly urges the auxiliary valve body 31 downward (valve closing direction) is omitted, but for example, FIGS. 1 to 1 to FIG. Similar to the electric valve 1 of the first embodiment shown in 9, an O-ring (elastic member) is interposed between the main valve body 20 and the sub-valve body 31 to keep the sub-valve body 31 downward (valve closing direction) at all times. ), And as shown in FIGS. 14 and 15, a wave washer 33A (see FIG. 14) and a compression coil spring 33B (see FIG. 15) between the main valve body 20 and the sub valve body 31. Of course, an elastic member such as (see) may be interposed.

Further, for example, as shown in FIG. 15, a pressing member 38 or the like is used between the main valve body 20 (main valve body portion 20A) (outer circumference) and the sub-valve body 31 (inner circumference). , An O-ring, and a seal member 39 made of a ring-shaped packing may be attached.

Further, in the electric valves 1 and 2 of the above-described embodiment, a mysterious planet is formed between the rotor 57 and the screw feed mechanism in order to strongly press the main valve body 20 against the main valve seat 8a (in other words, to improve the sealing property). Although the gear deceleration type with the gear deceleration mechanism 40 interposed therebetween has been described as an example, the present invention has a linear drive type (detailed structure and) in which the mysterious planetary gear deceleration mechanism 40 and related parts have been removed. It goes without saying that the description of the operation can be applied to the above-mentioned Patent Document 1 and the like if necessary).

Further, the electric valve according to the present invention is not limited to the configuration of each of the above-described embodiments, and for example, the configuration around the main valve body and the sub valve body can be variously changed.

1 Solenoid valve (first embodiment)
2 Electric valve (second embodiment)
7 Valve chamber 8 Valve seat member 8a Main valve seat 8b Sub valve seat 8c Inverted conical base surface 9 Valve port 10 Valve body 10A Cylindrical base 11 First inlet / outlet 12 Second inlet / outlet 20 Main valve body 20a Seal surface 20A Main valve body Part 20B Strut part 21 Small diameter fitting cylinder part 22 Lower large diameter fitting hole 22A Circular recess 30 Sub-valve body (first embodiment)
30a Sealing surface 30c Fitting hole 30A Cylindrical portion 30B Lower outer flange-shaped portion 30C Upper inner flange-shaped hooking portion 31 Sub-valve body (second embodiment)
31a Sealing surface 31A Cone trapezoidal portion 31B Lower outer flange-shaped portion 31C Upper inner flange-shaped locking portion 32 Washer 33 O-ring (elastic member)
34 Bleed hole 35 Filter (first embodiment)
36 filter (second embodiment)
36a Outer peripheral step 40 Mysterious planetary gear type reduction mechanism 50 Stepping motor 55 Stator 57 Rotor 58 Can

Claims (11)

A valve body provided with a valve chamber, a plurality of inlets and outlets, and a valve opening, a main valve body movably arranged in the valve chamber to open and close the valve opening, and a valve body joined to the valve body. A stepping motor consisting of a tubular can, a rotor rotatably arranged inside the can, and a stator arranged outside the can, and the rotation of the rotor is converted into vertical movement of the main valve body. It is an electric valve equipped with a screw feed mechanism.
A sub-valve body for opening and closing the valve port is arranged on the main valve body, and the sub-valve body uses the valve port as the main valve body when the main valve body closes the valve port. While closing the valve earlier,
After the sub-valve body closes the valve port to at least one of the sub-valve body and the valve port, the valve port and the valve chamber are kept until the main valve body closes the valve port. A filter is provided to allow communication,
The sub-valve body is slidable in the vertical direction and is locked and engaged with the main valve body.
The sub-valve body is arranged in the main valve body so as to be movable up and down with a predetermined gap and is locked and locked, and has a cylindrical portion having a bleed hole formed of a through hole. An electric valve characterized in that the filter is arranged outside or inside the bleed hole in the portion. 2. Electric valve. The main valve body moves up and down in the vertical direction with respect to the main valve seat to open and close the valve opening, and the sub-valve body moves up and down in the vertical direction with respect to the sub-valve seat. The electric valve according to claim 2, wherein the valve port is opened and closed. A main valve sheet with which the main valve body is brought into contact with and detached is provided at the valve opening in the valve body, and the filter having the sub-valve sheet with which the sub-valve body is brought into contact with and detached is fixed. The electric valve according to any one of claims 1 to 3. The electric valve according to any one of claims 1 to 4, wherein a lower outer flange-shaped portion that comes into contact with and separates from the valve opening is provided in the lower portion of the cylindrical portion. The electric valve according to claim 5, wherein an elastic member for urging the sub-valve body in the valve closing direction by an elastic force is interposed between the sub-valve body and the main valve body. .. The sixth aspect of claim 6 is characterized in that the filter is held under a narrow pressure between the lower outer flange-shaped portion and a washer interposed between the elastic member and the auxiliary valve body. Electric valve. The main valve body has a main valve body portion that opens and closes the valve opening, and a strut portion that is connected to the upper side of the main valve body portion.
An upper inner flange-shaped hook portion provided on the upper part of the cylindrical portion is arranged between the upper surface of the main valve body portion and the lower surface of the strut portion so as to be movable up and down and retracted and locked. Claims 1 to 4, wherein an elastic member for urging the auxiliary valve body in the valve closing direction by an elastic force is interposed between the strut portion and the upper inner flange-shaped hook portion. The electric valve according to any one of the items. A lower outer flange-shaped portion that comes into contact with and separates from the valve opening is provided at the lower portion of the cylindrical portion.
The filter is characterized in that it is held under a narrow pressure between the lower outer flange-shaped portion and a washer interposed between the elastic member and the upper inner flange-shaped hook portion. 8. The electric valve according to 8. The electric valve according to any one of claims 1 to 9, wherein a seal member is interposed between the main valve body and the sub-valve body. The motorized valve according to any one of claims 1 to 10, wherein a planetary gear type speed reduction mechanism is provided between the rotor and the screw feed mechanism.

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