JP6745141B2 - Flow control valve - Google Patents

Description

The present invention relates to a flow rate adjusting valve suitable for adjusting the flow rate of a refrigerant in, for example, a heat pump type cooling and heating system, and particularly to a flow rate adjusting valve capable of reducing noise when a fluid (refrigerant) passes through.

As an example of this kind of flow rate adjusting valve, a valve body provided with a valve chamber and a valve opening (orifice) with a valve seat, and a valve body that changes the flow rate of the fluid flowing through the valve opening according to the lift amount from the valve seat. And the valve element is a screw feed type up-and-down drive configured by a valve shaft provided with a male screw, a bearing member provided with a female screw, a stepping motor, etc., as disclosed in Patent Documents 1 and 2, for example. A motor-operated valve is known, which is moved up and down by a mechanism so that the valve seat moves toward and away from and closes to a valve seat.

By the way, when the flow rate adjusting valve having the above-described configuration is incorporated in, for example, a heat pump type cooling and heating system, the valve port is opened to a predetermined opening degree, and the refrigerant flowing into the valve chamber is transferred from the valve chamber to the valve body and the valve port. There is a problem that continuous noise (fluid passing sound) is likely to occur when flowing out through a gap formed between the and.

More specifically, when the fluid (refrigerant) flowing into the valve opening is a mixed state of gas and liquid (gas-liquid two-phase flow), that is, when bubbles are mixed in the fluid flowing toward the valve opening through the valve chamber, the bubbles When passing through the valve port, a sudden pressure fluctuation is generated on the inflow side and the outflow side, and a large noise is generated by the pressure fluctuation. In particular, in the small opening area (area where the valve opening (lift amount of the valve body) is small), generally, the flow passage of the fluid at the valve opening (the gap between the valve body and the valve opening) is very narrow. Therefore, the influence of the bubbles in the fluid becomes large, and the above-mentioned loud noise (fluid passing sound) is more likely to occur.

In order to deal with such a problem, in the conventional technique disclosed in Patent Document 3, it is proposed to interpose a member (silencer member) for subdividing air bubbles in the fluid in the valve chamber.

JP2012-172839A JP, 2004-289901, A JP 2001-289538 A

By the way, in the large opening area (area where the valve opening is large), since the fluid passage (gap between the valve body and the valve opening) in the valve opening becomes wide, the above-mentioned large noise (fluid passage) Sound) is less likely to occur, but it becomes more necessary to secure a sufficient flow rate through the valve opening.

In the prior art disclosed in Patent Document 3, bubbles in the fluid are decomposed by the muffling member and subdivided into the gap between the valve body and the valve opening, so that the valve opening When passing, sudden pressure fluctuations do not occur on the inflow side and the outflow side, and the aforementioned noise can be reduced. However, since the sound deadening member is fixed to the valve body so as to always partition the inlet side and the outlet side of the valve chamber, in the large opening area where it is necessary to secure the flow rate passing through the valve opening, There is a problem that the flow of the fluid toward the front is obstructed, the pressure loss (pressure loss) increases, and it is difficult to obtain an appropriate refrigerant flow rate.

The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively reduce noise during passage of a fluid (refrigerant) and also to reduce pressure loss in a large opening range. It is to provide a flow control valve.

In order to achieve the above-mentioned object, a flow rate control valve according to the present invention basically comprises a valve body provided with a valve chamber and a first valve opening, and a valve shaft arranged in the valve chamber so as to be vertically movable. An elevating and lowering drive unit for elevating and lowering the valve shaft, and a slidably inserted externally on the valve shaft so as to surround the outer periphery of the lower end of the valve shaft, and driven in association with the elevating and lowering operation of the valve shaft. A valve body, the first valve body portion changing the flow rate of the fluid flowing through the first valve opening according to the lift amount, and the valve body lower end portion of the valve shaft. A small flow passage that connects the valve chamber and the first valve opening is formed through a communication space defined around the small flow passage, and the valve shaft is provided in the small flow passage according to the lift amount. A second valve body portion that changes the flow rate of the fluid flowing through the second valve opening is provided, and when the lift amount of the second valve body portion is less than or equal to a predetermined amount, the first valve body portion causes the first valve A small flow rate control state in which the mouth is closed and the flow rate is controlled according to the lift amount of the second valve body portion with respect to the second valve mouth, and the lift amount of the second valve body portion exceeds the predetermined amount And the valve body is moved up with the rise of the valve shaft so that the first valve body portion is in a large flow rate control state in which the first valve opening is opened, and the first flow path is opened in the small flow passage. A muffling member for subdividing bubbles in the fluid flowing through the small flow passage is disposed on the valve chamber side and the first valve port side with respect to the second valve port, and the valve element is the second valve of the valve shaft. A cylindrical interlocking member slidably inserted above the valve body and a valve body member provided with the first valve body section connected to a lower end opening of the interlocking member; A small flow passage connects the valve chamber and the communication space with each other. An upper communication passage provided in the valve shaft to communicate with the communication space, the communication space, and the valve body member for communicating the communication space with the first valve opening. And a lower communication passage provided in the communication space, the second valve port is formed around the valve body member in the communication space, and the muffling member includes the upper communication passage in the valve shaft and the valve. An inverted concave recessed hole that is disposed in the lower communication passage of the body member and communicates with the upper communication passage is formed in the lower end surface of the valve shaft, and the inner peripheral side of the recessed hole is the second valve. Characterized by the fact that it is designed to approach and separate from the mouth .

In a further preferred aspect, the sound deadening member is installed in a vertical hole in the upper communication passage of the valve shaft and/or in a vertical hole in the lower communication passage of the valve body member.

In another preferred aspect, the valve shaft is provided with a fitting insertion hole extending in the axial direction, and a tubular tubular member is fitted and fixed in the fitting insertion hole with a predetermined gap, By an internal space, a lateral through hole provided at the upper end of the tubular member, the gap between the tubular member and the fitting insertion hole, and a lateral hole provided outside the tubular member in the valve shaft. The upper communication path of the valve shaft is formed, and the muffling member is installed in the internal space of the tubular member.

In another preferred aspect, the silencing member is fixed to the lower communication passage of the valve body member, and the silencing member is supported and fixed to the lower communication passage of the valve body member by a support member having a through hole.

In another preferred aspect, the first valve body portion closes the first valve opening, and the second valve body portion closes the second valve opening, and the first valve opening extends from the first valve opening. A check valve body is provided that allows the flow of fluid toward the valve chamber but blocks the flow of fluid from the valve chamber toward the first valve opening.

In a further preferred aspect, the valve body accommodates a storage chamber in which the check valve body is stored, a communication between the storage chamber and the first valve port, and a difference between the first valve port side and the valve chamber side. A check valve port that is opened and closed by the check valve body according to the pressure and a communication port that is in constant communication with the storage chamber and the valve chamber are provided.

In a further preferred aspect, the valve shaft accommodates a storage chamber in which the check valve body is stored, and communicates with the storage chamber and the first valve port, and the first valve port side and the valve chamber side. A check valve port that is opened and closed by the check valve body according to the differential pressure of the storage chamber, and the storage chamber is continuously provided in an upper communication passage that communicates the valve chamber with the communication space. The chamber and the valve chamber are in continuous communication with each other.

In the flow rate adjusting valve according to the present invention, the small flow passage is provided on the valve chamber side and the second valve mouth side with respect to the second valve opening in the small flow passage that communicates the valve chamber with the first valve opening via the communication space. Since the muffling member for subdividing the bubbles in the flowing fluid is distributed, noise when the fluid (refrigerant) passes can be effectively reduced, and the pressure loss in the large opening (large flow rate control) region becomes small, A proper refrigerant flow rate can be obtained.

Further, since the muffling member is internally provided in the vertical hole in the upper communication passage of the valve shaft forming the small flow passage and the vertical hole in the lower communication passage of the valve body member, the muffling member can be arranged for a long time, and the fluid ( It is possible to more effectively reduce noise when passing through (refrigerant).

The whole sectional view showing one embodiment of the flow control valve concerning the present invention. The perspective view which shows the interlocking member of the valve body shown by FIG. The perspective view which shows the presser plate of the valve body shown by FIG. FIG. 2 is a cross-sectional view of a main part showing a main part (during normal flow) of the flow rate control valve shown in FIG. 1, where (A) is a fully closed state, (B) is a small lift amount state (small flow rate control state), FIG. 6C is a diagram showing a fully open state (large flow rate control state). FIG. 2 is a cross-sectional view of a main part showing a main part (during reverse flow) of the flow rate control valve shown in FIG. 1, where (A) is a fully closed state, (B) is a state where a check valve port is opened due to a differential pressure, ( C) is a diagram showing a fully opened state. The whole sectional view which shows the modification (1) of the flow control valve shown by FIG. The whole sectional view which shows the modification (2) of the flow control valve shown by FIG. The whole sectional view which shows the modification (3) of the flow regulating valve shown in FIG. It is a figure which shows the modification (4) of the flow control valve shown in FIG. 1, (A) is a principal part sectional drawing which shows a principal part, (B) is a perspective view which shows an example of a check valve body, ( C) is a perspective view showing another example of the check valve body.

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

1 is an overall sectional view showing an embodiment of a flow rate adjusting valve according to the present invention, FIG. 2 is a perspective view showing an interlocking member of the valve body shown in FIG. 1, and FIG. 3 is a valve shown in FIG. It is a perspective view which shows the press plate of a body.

In this specification, the description of the position, direction such as up and down, left and right, and front and back is added for convenience according to the drawings in order to avoid complicated description, and the position and direction in the actual usage state. Does not necessarily mean.

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

The flow rate adjusting valve 1 of the illustrated embodiment is an electric valve used for adjusting the flow rate of the refrigerant in, for example, a heat pump type cooling and heating system, and like a conventional flow rate adjusting valve described above, a fluid (refrigerant) is introduced and derived. The valve body 10 having the valve chamber 14 and the valve seat (first valve seat) 15 with the valve port (first valve port) 16 opening to the valve chamber 14, and the valve body 10 via the ring-shaped base plate 31. A bottomed cylindrical can 30, which is fixed to the can 30, a stepping motor (elevating drive unit) 63 including a stator 40 fitted onto the can 30, and a rotor 50 rotatably arranged on the inner periphery of the can 30. A mysterious planetary gear speed reduction mechanism 60 that reduces the rotation speed of the rotor 50, and a passage amount of fluid that is brought into contact with and separated from the valve seat 15 (in other words, flows through the valve port 16 according to the lift amount from the valve seat 15). A screw for driving (moving up and down) the valve shaft 20 provided with the valve body 32 for changing the flow rate of the fluid and the output gear 57 of the mysterious planetary gear reduction mechanism 60 by converting the rotational motion into a linear motion. And a feed mechanism 27.

An inlet 11 to which a pipe joint 11A is connected is provided on one side of a valve chamber 14 in the valve body 10, and a pipe joint 12A is connected to the bottom of the valve inlet 11 and a valve having a valve seat 15 and a cylindrical surface. An outlet 12 having a mouth 16 is provided. Further, a bearing member 13 having a female screw portion 13a formed in the lower half portion of the central portion is fitted into the upper portion of the valve chamber 14 of the valve body 10 and fixed to the valve body 10 by caulking (caulking portion 17). A lower end of a cylindrical can 30 having a lid is hermetically joined to the base plate 31 fixed to the outer circumference (stepped portion thereof) of the valve body 10 by butt welding or the like.

The stator 40 mounted on the outer periphery of the can 30 includes a yoke 41, a bobbin 42, a coil 43, a resin mold cover 44, and the like. The rotor 50 rotatably supported inside the can 30 (without moving up and down) is A cylindrical rotor member 51 made of a magnetic material and a sun gear member 52 made of a resin material are integrally connected to each other. A shaft 62 is inserted in the center of the sun gear member 52, and the upper portion of the shaft 62 is supported by a support member 61 arranged inside the top of the can 30.

The sun gear 53 of the sun gear member 52 meshes with a plurality of planet gears 55 rotatably supported by a shaft 56 provided on a carrier 54 mounted on the bottom surface of the output gear 57. The upper half of the planetary gear 55 meshes with an annular ring gear (internal tooth fixed gear) 58 attached by caulking to the upper portion of the cylindrical member 18 fixed to the upper portion of the valve body 10, and the lower half of the planetary gear 55 has an annular shape. Is meshed with the internal gear 57a of the output gear 57. The number of teeth of the ring gear 58 and the number of teeth of the internal gear 57a of the output gear 57 are slightly different from each other, whereby the rotation speed of the sun gear 53 is reduced at a large reduction ratio and transmitted to the output gear 57. (This kind of gear configuration is called a so-called mysterious planetary gear reduction mechanism 60).

The output gear 57 is in sliding contact with the upper surface of the tubular bearing member 13, the upper part of the stepped cylindrical output shaft 59 is press-fitted into the center of the bottom part of the output gear 57, and the lower part of the output shaft 59 is located. The bearing member 13 is rotatably inserted into a fitting insertion hole 13b formed in the upper half of the central portion of the bearing member 13. The lower part of the shaft 62 is fitted on the upper part of the output shaft 59.

The valve shaft 20 includes a screw drive member (also referred to as a driver) 22, a stepped cylindrical thrust transmission shaft 28, and a stepped shaft-shaped upper portion of which is internally fitted and fixed to a lower portion of the thrust transmission shaft 28. The connecting shaft 29 is provided, and the valve body 32 is slidably fitted on the connecting shaft 29 so as to surround the lower end outer circumference of the connecting shaft 29 (that is, the lower end outer circumference of the valve shaft 20).

The male screw portion 22a provided on (the outer periphery of) the screw driving member 22 that constitutes the valve shaft 20 is screwed into the female screw portion 13a provided on (the inner periphery of) the bearing member 13, and the screw driving thereof is performed. The member 22 converts the rotational movement of the output gear 57 (that is, the rotor 50) into a linear movement in the direction of the axis O (elevating direction) by the screw feeding mechanism 27 including the male screw portion 22a and the female screw portion 13a. Here, the output gear 57 is rotating at a fixed position in the direction of the axis O without vertically moving, and is screwed into a slit-shaped fitting groove 59b provided at the lower end of the output shaft 59 connected to the output gear 57. The flat driver-shaped plate-like portion 22b provided at the upper end of the driving member 22 is inserted to transmit the rotational movement of the output gear 57 to the screw driving member 22 side. When the plate-shaped portion 22b provided on the screw drive member 22 slides in the fitting groove 59b of the output shaft 59 in the direction of the axis O, the output gear 57 (rotor 50) rotates, the output gear 57 rotates. The screw driving member 22 linearly moves in the axis O direction by the screw feeding mechanism 27, although it does not move in the axial direction. The linear movement of the screw drive member 22 is transmitted to the thrust transmission shaft 28 via a ball-shaped joint 25 including a ball 23 and a ball seat 24 fitted in a stepped fitting hole provided in the upper portion of the thrust transmission shaft 28. Transmitted. The connecting shaft 29 connected to the thrust transmitting shaft 28 is slidably inserted in (the lower part of) the stepped cylindrical spring case 19 fixed inside the valve body 10, and the valve shaft 20 is It is guided by the spring case 19 and moves in the direction of the axis O. Further, a compression coil spring 26 for constantly urging the valve shaft 20 in the valve opening direction (upward) is provided between the spring case 19 (upward step surface) and the thrust transmission shaft 28 (downward step surface). It is disguised.

A brim-shaped locking portion 29a that engages with (around the insertion portion 33c of) a ceiling portion 33b of the interlocking member 33 described later is provided on the outer periphery of the lower end of the connecting shaft 29 (outward), and the connecting shaft 29b An inverted concave recess 29c is formed on the lower end surface of the valve 29, and the valve chamber 14 and the communication space 34 (the valve shaft 32 (the connecting shaft 29 of the valve shaft 20) are connected to the recess 29c so as to be continuous with the recess 29c. ) Is provided with a communication passage (upper communication passage) 29w that communicates with the space defined around the lower end portion of FIG. Here, the communication passage 29w extends vertically from the center (upper surface) of the concave hole 29c in a vertical direction (axis O direction), and has a relatively large diameter vertical hole 29v, and the vertical hole 29v extends laterally from the middle portion. It is composed of a plurality of formed lateral holes 29u having a relatively small diameter. When the lift amount L of the valve shaft 20 is small (small flow rate control state), each lateral hole 29u is designed to be opened to the valve chamber 14 below the spring case 19 externally fitted to the connecting shaft 29. (Detailed later). Around the recessed hole 29c in the lower end surface of the connecting shaft 29 is a second valve body portion 29b that opens and closes the valve port 36 by coming into contact with and separating from a valve seat 35 provided in a valve body 32 described later.

The valve body 32 has a ceiling portion slidably inserted above the brim-shaped engaging portion 29a of the connecting shaft 29 of the valve shaft 20 (and below the lateral hole 29u of the communication passage 29w). The valve body 32 includes a cylindrical interlocking member 33 and a stepped valve body member 38 connected to the lower end opening of the interlocking member 33 by welding, press fitting, caulking, or the like. The space defined around the lower end portion of (the connecting shaft 29 of) the valve shaft 20 by 38) is a communication space 34.

The ceiling portion 33b of the interlocking member 33 is provided with an insertion portion 33c having a short cylindrical surface through which the connecting shaft 29 is slidably inserted. Further, the lower end portion of the cylindrical portion 33a of the interlocking member 33 is fixed by welding or the like to the collar-shaped portion 38a provided on the outer peripheral portion of (the lower large diameter portion of) the valve body member 38 (see particularly FIG. 2). ).

On the other hand, the lower end surface of the valve body member 38 (the lower large diameter portion thereof) comes in contact with (separates from above) the valve seat 15 of the valve body 10 (from the upper side) to open and close the valve opening 16 (first valve body portion in the shape of an inverted truncated cone) ( The truncated conical surface portion) 38b, and the valve body member 38 is provided with a communication passage (lower communication passage) 38w for always communicating the valve opening 16 and the communication space 34. Here, the communication passage 38w is formed in a vertical direction (the direction of the axis O) from the center of the lower end surface of the valve body member 38 (the lower large diameter portion thereof) (to the intermediate body portion of the valve body member 38) and is relatively large. It is composed of a vertical hole 38v having a stepped diameter, and a plurality of horizontal holes 38u having a relatively small diameter formed laterally from the upper portion of the vertical hole 38v. Further, the upper portion (upper small diameter portion) of the valve body member 38 is inserted into the recessed hole 29c of the connecting shaft 29 of the valve shaft 20 with a slight gap, and is formed as an intermediate body portion of the valve body member 38. A valve seat (second valve seat) 35 with which the second valve body portion 29b of the connecting shaft 29 comes in contact with and is separated from is provided on a truncated cone surface portion 37 formed between the upper small diameter portion. That is, in this example, a cylindrical surface having a diameter smaller than that of the valve opening (first valve opening) 16 of the valve body 10 is provided around (the truncated cone surface portion 37 of) the valve member 38 in the communication space 34, and the connecting shaft 29 valve port which is opened and closed by the second valve body portion 29 b (second valve port) 36 is formed which is formed on the lower end face of the.

Further, a concave storage chamber 21b is provided in the upper portion (upper small diameter portion) of the valve body member 38, and a check valve including a vertical hole extending to the vertical hole 38v of the communication passage 38w is provided at the center of the bottom of the storage chamber 21b. mouth 21v is provided on (a plurality of positions around the axis O of) the side of the storage room 21b, the communication port 21u comprising a plurality of lateral holes provided in its housing chamber 21b, the inlet 11 and the outlet A check valve body 21 made of a ball is housed in order to open and close the check valve port 21v according to the pressure difference between the check valve body 12 and the valve 12 (detailed later). The check valve body 21 is slightly swollen in the direction of the axis O in the storage chamber 21b by caulking the upper end portion (around the storage chamber 21b thereof) of the valve body member 38 inward (caulking portion 21a). It is slidably distributed.

Here, the collar-shaped locking portion 29a provided on the connecting shaft 29 of the valve shaft 20 and the ceiling portion 33b of the interlocking member 33 are used when the valve port 36 is closed by the second valve body portion 29b of the connecting shaft 29. (In other words, when the second valve body portion 29b of the connecting shaft 29 is seated on the valve seat (second valve seat) 35 provided on the truncated cone surface portion 37 of the valve body member 38), the axis O direction (up and down direction) ) Is set so as to have a gap La of a predetermined size (detailed later).

In addition, the valve body 32 is always closed in the valve closing direction between the spring case 19 (downward step surface) and the interlocking member 33 (around the insertion portion 33c on the upper surface of the ceiling 33b of the valve body 32) forming the valve body 32 ( A compression coil spring (biasing member) 39 that urges downward) is compressed.

In addition to the above configuration, in the present embodiment, in order to subdivide air bubbles in the fluid (in the fluid flowing through the small flow passage), the communication passage (upper communication passage) 29w of the connecting shaft 29 of the valve shaft 20 has a substantially circular shape. A sound deadening member (a sound deadening member on the valve chamber 14 side) 71 made of a columnar metal mesh or the like is provided, and a substantially columnar metal is also provided in the communication passage (lower communication passage) 38w of the valve body member 38 of the valve body 32. A sound deadening member (a sound deadening member on the valve port 16 side) 72 made of a mesh or the like is provided.

Specifically, the muffling member 71 is vertically installed in the vertical hole 29v in the communication passage 29w of the connecting shaft 29 of the valve shaft 20, and around the lower end of the vertical hole 29v in the communication passage 29w of the connecting shaft 29 ( It is supported and fixed in the vertical hole 29v by being caulked (toward the inside). Further, the sound deadening member 72 is installed in the vertical hole 38v in the communication passage 38w of the valve body member 38 of the valve body 32, and a plurality of muffling members are provided in the step portion of the vertical hole 38v in the communication passage 38w of the valve body member 38 (illustrated example) In this case, the pressing plate (supporting member) 73 having the four through holes 73a is fixed by caulking or the like (see FIG. 3) to be supported and fixed in the vertical hole 38v.

Here, as the sound deadening members 71 and 72, a metal mesh (mesh member) having a plurality of small holes is formed into a cylindrical shape, a plate-shaped metal mesh is laminated into a cylindrical shape, or a plate is used. A cylindrical metal mesh is wound into a cylindrical shape, but if the bubbles in the fluid can be subdivided, the muffling members 71, 72 may be made of resin, or the muffling member 71, 72 itself may be formed of a cylindrical porous body.

Further, it goes without saying that the number of through holes 73a of the pressing plate 73, the hole diameter, the forming position, and the like are not limited to the illustrated examples, and the method of fixing the muffling members 71 and 72 is not limited to the illustrated examples. Of course.

In the flow rate control valve 1 having such a configuration, the fluid (refrigerant) is bidirectional (the direction from the inflow port 11 to the outflow port 12 (lateral→down, normal flow)) and the direction from the outflow port 12 to the inflow port 11 (downward). The flow rate of the fluid (refrigerant) passes by controlling the rotation amount of the rotor 50 and changing the lift amount L of the valve shaft 20. Is adjusted.

<Operation of flow rate adjusting valve 1 when the flow is normal>
At the time of forward flow, in the fully closed state (the state where the lift amount L of the valve shaft 20 is 0) as shown in FIG. 4A, the second valve body portion 29b of (the connecting shaft 29 of) the valve shaft 20 is. Is pressed against (seats) the valve seat 35 of (the valve body member 38 of) the valve body 32 to close the valve port 36, and the first valve body portion 38b of the (valve body member 38 of) the valve body 32 is the valve body. The valve opening 16 is closed by being pressed (seated) to the valve seat 15 of No. 10. Further, the check valve body 21 is biased by the pressure of the fluid (fluid pressure) flowing from the inflow port 11 into the valve chamber 14 to close the check valve port 21v of (the valve body member 38 of) the valve body 32. (That is, the check valve body 21 blocks the flow of fluid from the valve chamber 14 to the valve port 16). At this time, the flange-shaped locking portion 29a (the upper surface) of the valve shaft 20 (the connecting shaft 29 of the valve shaft 20) and the ceiling portion 33b (the lower surface) of the interlocking member 33 of the valve body 32 are arranged in the direction of the axis O (vertical direction). They are located apart from each other by a gap La having a predetermined dimension.

In this fully closed state, when the valve shaft 20 is raised, as shown in FIG. 4B, the first dimension of the valve body 32 is maintained until the clearance (lift amount) La of the predetermined dimension (small flow rate control state). The valve body portion 38b is pressed against (seats against) the valve seat 15 of the valve body 10 by (the biasing force of) the compression coil spring 39, and the check valve body 21 is biased by the fluid pressure to check the valve body 32. The valve shaft 20 moves (raises) such that the connecting shaft 29 of the valve shaft 20 slides in the insertion portion 33c of the valve body 32 (the ceiling 33b of the interlocking member 33) while the valve opening 21v remains closed. The second valve body portion 29b of the valve shaft 20 is separated from the valve seat 35 of the valve body 32, and the valve port 36 is opened. The fluid flowing from the inflow port 11 into the valve chamber 14 has a communication passage (upper communication passage) 29w (lateral hole 29u, vertical hole 29v) of the connecting shaft 29 of the valve shaft 20 →the concave hole 29c of the valve shaft 20 (of the valve element 32 in the Upper part (gap with upper small diameter part)→gap between second valve body part 29b of valve shaft 20 and valve seat 35 of valve body 32 (valve port 36)→communication space 34→valve body member 38 of valve body 32 Through the communication passage (lower communication passage) 38w (horizontal hole 38u, vertical hole 38v) (particularly, the through hole 73a of the pressing plate 73 fixed to the vertical hole 38v of the communication passage 38w), the valve port 16 continuing to the lower side thereof. And the flow rate of the fluid flowing into the valve opening 16 gradually increases as the valve shaft 20 rises. At this time, the fluid flowing from the inflow port 11 into the valve chamber 14 passes through the muffling member 71 arranged in the communication passage 29w (when passing through the vertical hole 29v of the communication passage 29w of the connection shaft 29 of the valve shaft 20). At the same time, (when passing through the vertical hole 38v of the communication passage 38w of the valve body member 38 of the valve body 32) passes through the muffling member 72 arranged in the communication passage 38w, and is upstream of the valve port 36 (the valve chamber 14 side). And, the two muffling members 71, 72 arranged on the downstream side (on the side of the valve opening 16) pass through the valve opening 16 (outlet 12) in a state where air bubbles in the fluid are decomposed and subdivided. .. Therefore, in a small flow rate control (small opening) region (a region where noise is likely to occur), noise when a fluid (refrigerant) passes is reliably reduced.

Here, the communication passage (upper communication passage) 29w (lateral hole 29u, vertical hole 29v) of the connection shaft 29 of the valve shaft 20 described above → the concave hole 29c of the valve shaft 20 → the second valve body portion 29b of the valve shaft 20 and the valve body 32 (valve port 36) from the valve seat 35→communication space 34→valve 14 through the communication passage (upper communication passage) 38w (lateral hole 38u, vertical hole 38v) of the valve body member 38 of the valve body 32 The flow path communicating with the port 16 is called a small flow passage.

The lift amount La is a lift amount L of the valve shaft 20 that corresponds to a flow rate at which noise (fluid passing sound) easily occurs when a fluid (refrigerant) passes, and can be determined in advance based on experiments and the like.

When the valve shaft 20 is raised to the lift amount La and then further raised (that is, the lift amount L exceeds the lift amount La), as shown in FIG. The flange-shaped locking portion 29a of the shaft 29) engages with (the ceiling portion 33b of the interlocking member 33 of) the valve body 32, and the valve body 32 resists the biasing force of the compression coil spring 39 and the valve shaft 20 ( (Moved together), the first valve body portion 38b of the valve body 32 is separated from the valve seat 15 of the valve body 10, and the first valve body portion 38b of the valve body 32 and the valve seat 15 of the valve body 10 are moved. A gap (annular flow path) having a width Lb (=L-La) (in the direction of the axis O) is formed between the two (a large flow rate control state). The fluid flowing from the inflow port 11 into the valve chamber 14 flows into the valve opening 16 continuing below through the gap between the first valve body portion 38b of the valve body 32 and the valve seat 15 of the valve body 10, and the valve shaft As the pressure rises by 20, the flow rate of the fluid flowing into the valve port 16 gradually increases. At this time, a part of the fluid flowing from the inflow port 11 into the valve chamber 14 passes through the communication passage 29w of the connecting shaft 29 of the valve shaft 20 and the like as described above, and the muffling members 71 and 72 cause bubbles in the fluid. Although it passes through the valve opening 16 (outlet 12) in a disassembled and fragmented state, most of it passes between the first valve body portion 38b of the valve body 32 and the valve seat 15 of the valve body 10. It will pass through the gap (flow path) formed in and will flow directly into the valve port 16 (outflow port 12). Therefore, the pressure loss (pressure loss) becomes small in a large flow rate control (large opening) region (a region where noise is unlikely to occur and a flow amount is to be secured) where the lift amount L of the valve shaft 20 is relatively large.

It should be noted that, even when the valve shaft 20 is lowered from the fully opened state as shown in FIG. 4(C) and the flow rate of the fluid flowing into the valve port 16 is gradually reduced, it is said that the same effect as the above can be obtained. There is no limit.

<Operation of flow rate adjusting valve 1 at the time of reverse flow>
At the time of reverse flow, in the fully closed state as shown in FIG. 5(A) (the state described based on FIG. 4(A)), the valve port 16 side (outlet port 12 side) and the valve chamber 14 side (flow port). When the pressure difference with the inlet 11) becomes larger than a predetermined pressure difference (in other words, the pressure on the valve port 16 side becomes higher than the pressure on the valve chamber 14 side by a predetermined pressure), as shown in FIG. 5B. The second valve body portion 29b of (the connecting shaft 29 of) the valve shaft 20 is pressed against (seats) the valve seat 35 of (the valve body member 38 of) the valve body 32, and (the valve body member 38 of) the valve body 32. With the first valve body portion 38b of (1) being kept in pressure contact (seated) with the valve seat 15 of the valve body 10, the check valve body 21 moves within the storage chamber 21b by the pressure (fluid pressure) of the fluid flowing from the outlet 12. As a result, the check valve port 21v of (the valve body member 38 of) the valve body 32 is opened. The fluid flowing in from (the valve opening 16 of) the outlet 12 is fixed to the communication passage (lower communication passage) 38w (vertical hole 38v) of the valve body member 38 of the valve body 32 (in particular, to the vertical hole 38v of the communication passage 38w). Through hole 73a of the pressing plate 73) → check valve port 21v → storage chamber 21b → communication port 21u → concave hole 29c of the valve shaft 20 (the gap between the upper part (upper small diameter part) of the valve body 32) → valve It flows into the valve chamber 14 through the communication passage (upper communication passage) 29w (vertical hole 29v, horizontal hole 29u) of the connecting shaft 29 of the shaft 20. In this state, the opening area of the flow path through which the fluid flowing into the valve chamber 14 (that is, the fluid flowing out to the inflow port 11) flows is constant. At this time, the fluid flowing from the outflow port 12 passes through the sound deadening member 72 arranged in the communication passage 38w (when passing through the vertical hole 38v of the communication passage 38w of the valve body member 38 of the valve body 32), and ( (When passing through the vertical hole 29v of the communication passage 29w of the connecting shaft 29 of the valve shaft 20) passes through the muffling member 71 arranged in the communication passage 29w, and upstream (valve opening 16 side) and downstream (the valve opening 16 side) of the valve opening 36. The two muffling members 72, 71 arranged on the valve chamber 14 side pass through the valve chamber 14 (inflow port 11) in a state where air bubbles in the fluid are decomposed and subdivided. Therefore, in the small flow rate control region (a region where noise is likely to occur), noise during passage of the fluid (refrigerant) is reliably reduced.

When the valve shaft 20 is raised with the check valve port 21v opened, the second valve body portion 29b of the valve shaft 20 causes the valve seat 35 of the valve body 32 to rise, as shown in FIG. While being pressed against (seated to) (that is, with the flange-shaped locking portion 29a of the valve shaft 20 and the ceiling portion 33b of the interlocking member 33 being positioned apart from each other by a gap La of a predetermined dimension in the axis O direction). The valve body 32 resists the biasing force of the compression coil spring 39 (that is, the pressure of the fluid flowing from the valve opening 16 into the valve chamber 14 overcomes the biasing force of the compression coil spring 39) (integratedly). ) The first valve body portion 38b of the valve body 32 is moved (raised) away from the valve seat 15 of the valve body 10, and the first valve body portion 38b of the valve body 32 and the valve seat 15 of the valve body 10 are separated from each other. A gap (ring-shaped flow path) having a width L (in the direction of the axis O) is formed at. In this case, the check valve port 21v of (the valve body member 38 of) the valve body 32 remains open due to the fluid pressure on the check valve body 21. The fluid that has flown into (the valve port 16 of) the outflow port 12 flows into the valve chamber 14 through the gap between the first valve body portion 38 b of the valve body 32 and the valve seat 15 of the valve body 10, and the fluid of the valve shaft 20 As the temperature rises, the flow rate of the fluid flowing into the valve chamber 14 gradually increases. At this time, the fluid (most of it) that has flowed in from (the valve opening 16 of) the outflow port 12 is a gap formed between the first valve body portion 38 b of the valve body 32 and the valve seat 15 of the valve body 10 ( It will pass through the flow path) and flow directly into the valve chamber 14 (inflow port 11). Therefore, the pressure loss (pressure loss) is small in a large flow rate control region (a region where noise is unlikely to occur and a flow amount is desired to be secured) in which the lift amount L of the valve shaft 20 is relatively large.

As described above, in the flow rate adjusting valve 1 of the present embodiment, the valve opening (second valve opening) 36 in the small flow passage that connects the valve chamber 14 and the valve opening (first valve opening) 16 via the communication space 34. The valve chamber 14 side (upstream side in normal flow, downstream side in reverse flow) and the valve port 16 side (downstream side in normal flow, upstream side in reverse flow), specifically, of the valve shaft 20. A muffling member 71 that subdivides bubbles in the fluid flowing through the small flow passage into a communication passage (upper communication passage) 29w of the connecting shaft 29 and a communication passage (lower communication passage) 38w of the valve body member 38 of the valve body 32. , 72 are provided, noise can be effectively reduced when a fluid (refrigerant) passes, pressure loss in a large opening (large flow rate control) region can be reduced, and an appropriate refrigerant flow rate can be obtained. ..

Further, the muffling members 71, 72 are vertical holes 29v in the communication passage (upper communication passage) 29w of the valve shaft 20 that constitutes a small flow passage, and the communication passage (lower communication passage) of the valve body member 38 of the valve body 32. Since it is provided in the vertical hole 38v of 38w, the silencing members 71 and 72 can be arranged long, and noise during passage of the fluid (refrigerant) can be more effectively reduced.

In the above embodiment, the cylindrical silencing member 71 is arranged in the vertical hole 29v (the vertical hole 29v that forms the communication passage 29w together with the horizontal hole 29u) formed in the connecting shaft 29 of the valve shaft 20, but, for example, Like the flow rate control valve 1A shown in FIG. 6, the above-mentioned recessed hole 29c is extended in the direction of the axis O (up to the upper side of the lateral hole 29u), and the lower end is opened (long in the direction of the axis O). Is formed into a cylindrical shape (cylindrical shape having a smaller diameter than the fitting insertion hole 29d), and the lower end portion thereof is fitted to the inner circumference of the fitting insertion hole 29d (in particular, the inner circumference below the lateral hole 29u). The tubular member 29A having the contacting flange portion 29Aa is fitted and fixed with a predetermined gap, and the internal space of the tubular member 29A and the laterally-oriented (plurality) through holes provided at the upper end of the tubular member 29A. 29Au, the gap between (the outer wall of) the tubular member 29A and (the inner wall of) the fitting insertion hole 29d, and the lateral hole 29u form a communication passage (upper communication passage) 29w of the valve shaft 20. A cylindrical silencing member 71 may be installed in the internal space (vertical hole) of the member 29A. Note that, in FIG. 6, configurations having the same functions and actions as those of the above-described embodiment are denoted by the same reference numerals. In the flow rate adjusting valve 1A having such a configuration, the silencing member 71 (the vertical length thereof) arranged in the communication passage (upper communication passage) 29w in the connecting shaft 29 of the valve shaft 20 can be further lengthened, so that the fluid (refrigerant) can be used. Noise during passage can be reduced more effectively.

Further, in the above-described embodiment, the check valve body 21 is used to flow the fluid (refrigerant) from the inflow port 11 to the outflow port 12 (forward flow) and from the outflow port 12 to the inflow port 11 in the direction. Although it is made to flow in both directions (reverse flow), for example, the fluid (refrigerant) is directed in one direction (direction from the inlet 11 to the outlet 12 (normal flow), and the check valve body 21 is When it is applied to a system that does not function and flows only in the direction in which the check valve body 21v is always closed by the check valve body 21), a valve such as the flow control valve 1B shown in FIG. 7 is used. The small-diameter upper portion of the valve body member 38 of the body 32 may be removed, and the above-described check valve body 21 and the structures (accommodation chamber 21b, check valve port 21v, communication port 21u) associated therewith may be omitted. Note that, in FIG. 7, configurations having the same functions and actions as those of the above-described embodiment are denoted by the same reference numerals. It goes without saying that the flow rate adjusting valve 1B having such a configuration can also obtain the same operational effects as the flow rate adjusting valve 1 of the above-described embodiment.

Further, in the above-described embodiment, the mysterious planetary gear reduction mechanism 60 that reduces the rotation speed of the rotor 50 is used, but the mysterious planetary gear reduction mechanism is omitted, for example, as in the flow rate control valve 1C shown in FIG. Then, a bellows 28C is attached to the outer periphery of (the thrust transmission shaft 28 of) the valve shaft 20 and a ring-shaped upper spring bearing 28Ca sandwiched between (the stepped portion of) the thrust transmission shaft 28 and (the upper end portion) of the connection shaft 29. A compression coil spring 39 as an urging member for urging the valve body 32 in the valve closing direction (downward) may be interposed between the valve body 32 and the ceiling portion 33b of the interlocking member 33 (for detailed structure). (See also Patent Document 2 above). Note that, in FIG. 8, configurations having the same functions and actions as those of the above-described embodiment are denoted by the same reference numerals. It is needless to say that the flow rate adjusting valve 1C having such a configuration can also obtain the same operational effect as the flow rate adjusting valve 1 of the above-described embodiment.

Further, in the above embodiment, it is possible to configure the flow rate adjusting valve without attaching the compression coil spring 39. In this case, the valve element 32 is seated on the valve seat 15 or separated from the valve seat 15 mainly by fluid pressure.

Further, in a state in which the valve opening 16 is closed by the first valve body portion 38b of the valve body 32 and the valve opening 36 is closed by the second valve body portion 29b of the valve shaft 20, the valve opening 16 is closed by the valve chamber 14 The check valve structure using the check valve body 21 that allows the flow of the fluid toward the valve but blocks the flow of the fluid from the valve chamber 14 toward the valve opening 16 is not limited to the above-described structure. For example, like the flow rate adjusting valve 1D shown in FIG. 9A, the check valve body 21 may be arranged on (the connecting shaft 29 of) the valve shaft 20.

More specifically, a cylindrical portion 29D with a bottom portion is projected (downward) from the lower end of the connecting shaft 29, and a plurality of lateral holes are formed below the brim-shaped engaging portion 29a formed on the outer periphery of the lower end of the connecting shaft 29. And a check valve port 21v formed of a vertical hole is provided at the center of the bottom of the connecting shaft 29 (the cylindrical portion 29D with the bottom thereof), and the inside of the connecting shaft 29 (the cylindrical portion 29D with the bottom thereof) ( A check valve body having an inverted conical surface portion that comes into contact with and separates from the check valve opening 21v in the storage chamber 21b) in order to open and close the check valve opening 21v according to the pressure difference between the inlet 11 and the outlet 12. 21 may be housed slidably in the direction of the axis O. In this case, the lower end surface of (the bottomed cylindrical portion 29D of) the connecting shaft 29 comes in contact with and separates from the valve seat 35 provided on the valve body 32 to open and close the valve port 36. The truncated cone surface portion) 29b, and a part of the side portion of the check valve body 21 (a portion opposite to the axis O in the illustrated example) is, for example, a D-cut surface (also referred to as a chamfered portion) 21Da. Are formed (see FIG. 9B). Further, instead of the D-cut surface 21Da, a vertical groove 21Db or the like for circulating a fluid may be adopted (see FIG. 9C). On the other hand, in the center of the valve body member 38 of the valve body 32, a communication passage (lower communication passage) 38wD formed of a stepped vertical hole that communicates the valve opening 16 and the communication space 34 is formed. A sound deadening member (a sound deadening member on the side of the valve opening 16) 72 made of a thin disk-shaped metal mesh or the like may be arranged in (the step portion of) the communication passage 38wD. Note that, in FIG. 9, configurations having the same functions and actions as those of the above embodiment are denoted by the same reference numerals.

In the flow rate control valve 1D having such a configuration, the storage chamber 21b in which the check valve body 21 is stored is continuously connected to (the vertical hole 29v of) the communication passage (upper communication passage) 29w provided in the connecting shaft 29 of the valve shaft 20. Since the storage chamber 21b and the valve chamber 14 are provided so as to be communicated with each other at all times, the same operational effect as the flow rate adjusting valve 1 of the above-described embodiment can be obtained.

In the present invention, the lift amount (valve opening) is arbitrarily and finely adjusted by moving up and down (moving) the valve shaft using the stepping motor having the stator and the rotor as described in the above embodiment. It is needless to say that the invention can be applied to an electromagnetic type flow rate adjusting (switching) valve using, for example, a solenoid as well as the electric type flow rate adjusting valve.

1 Flow Control Valve 10 Valve Body 11 Inlet 11A Pipe Joint 12 Outlet 12A Pipe Joint 14 Valve Chamber 15 Valve Seat (First Valve Seat)
16 valve mouth (first valve mouth)
20 valve shaft 21 non-return valve body 21a caulking portion 21b storage chamber 21u communication port 21v non-return valve opening 22 screw drive member 27 screw feed mechanism 28 thrust transmission shaft 29 connecting shaft 29a collar-shaped engaging portion 29b second valve body portion 29c Recessed hole 29u Horizontal hole 29v Vertical hole 29w Communication path (upper communication path)
30 can 32 valve body 33 interlocking member 33a interlocking member cylindrical portion 33b interlocking member ceiling 33c insertion portion 34 communication space 35 valve seat (second valve seat)
36 valve (2nd valve)
37 Frustum of Conical Surface 38 Valve Body Member 38b First Valve Body (Frustum of Conical Surface)
38u horizontal hole 38v vertical hole 38w communication passage (lower communication passage)
39 Compression coil spring (biasing member)
40 Stator 50 Rotor 60 Mysterious Planetary Gear Reduction Mechanism 63 Stepping Motor (elevation drive unit)
71 Noise reduction member (valve chamber side noise reduction member)
72 Noise reduction member (Valve side noise reduction member)
73 Presser plate (support member)
73a Through hole for the holding plate

Claims (7)

A valve body provided with a valve chamber and a first valve port, a valve shaft vertically movable in the valve chamber, a lift drive unit for moving the valve shaft up and down, and an outer circumference of a lower end of the valve shaft. A valve element slidably inserted into the valve shaft so as to surround the valve shaft and driven in association with the lifting operation of the valve shaft,
The valve body is provided with a first valve body section that changes a flow rate of a fluid flowing through the first valve opening according to a lift amount,
A small flow passage that connects the valve chamber and the first valve opening is formed through a communication space defined by the valve body around the lower end of the valve shaft, and the valve shaft has a lift amount. A second valve body portion that changes the flow rate of the fluid flowing through the second valve opening provided in the small flow passage according to
When the lift amount of the second valve body portion is equal to or smaller than a predetermined amount, the first valve opening is closed by the first valve body portion, and the lift amount of the second valve body portion with respect to the second valve opening is changed. When the lift amount of the second valve body portion exceeds the predetermined amount, the valve body is lifted as the valve shaft is lifted, and the first valve is lifted. The body is configured to take a large flow rate control state in which the first valve opening is opened,
A muffling member that subdivides air bubbles in the fluid flowing through the small flow passage is disposed on the valve chamber side and the first valve opening side of the small flow passage from the second valve opening ,
The valve body is connected to a cylindrical interlocking member slidably inserted above the second valve body section of the valve shaft and a lower end opening of the interlocking member, and the first valve body section is It is configured with the provided valve body member,
The small flow passage connects the valve chamber and the communication space to each other. An upper communication passage provided in the valve shaft to communicate with the communication space, the communication space, and the valve body to communicate the communication space with the first valve opening. A lower communication passage provided in the member, the second valve opening is formed around the valve body member in the communication space,
The sound deadening member is disposed in the upper communication passage of the valve shaft and the lower communication passage of the valve body member,
An inverted concave recessed hole that communicates with the upper communication passage is formed on the lower end surface of the valve shaft, and the inner peripheral side of the recessed hole is brought into contact with and separated from the second valve port. Flow control valve. 2. The flow rate adjusting device according to claim 1 , wherein the muffling member is installed in a vertical hole in the upper communication passage of the valve shaft and/or in a vertical hole in the lower communication passage of the valve body member. valve. The valve shaft is provided with a fitting insertion hole extending in the axial direction, and a tubular tubular member is fitted and fixed in the fitting insertion hole with a predetermined gap,
The internal space of the tubular member, a lateral through hole provided at the upper end of the tubular member, the gap between the tubular member and the fitting insertion hole, and provided outside the tubular member in the valve shaft. And the upper lateral passage of the valve shaft is formed by
The flow control valve according to claim 1 or 2 , wherein the sound deadening member is internally provided in the internal space of the tubular member. Is fixed to the lower communication passage of the valve body member, according to claim 1, by a support member having a through hole, wherein the silencing member is characterized in that it is supported by and fixed to the lower communication passage of the valve member The flow rate adjustment valve according to any one of 1 to 3 . With the first valve body section closing the first valve opening and the second valve body section closing the second valve opening, the fluid flowing from the first valve opening toward the valve chamber permits flow but from the valve chamber according to any one of claims 1 to 4, characterized in that non-return valve body to block the flow of fluid to the first valve port is provided Flow control valve. In the valve body, a storage chamber in which the check valve body is stored, the storage chamber communicates with the storage chamber and the first valve opening, and the storage chamber is connected to the first valve opening side and the valve chamber side according to a pressure difference between the first valve opening side and the valve chamber side. The flow control valve according to claim 5 , further comprising a check valve opening and closing by a check valve body, and a communication port that always communicates with the storage chamber and the valve chamber. A storage chamber in which the check valve body is stored in the valve shaft, and a storage chamber that communicates with the storage chamber and the first valve port and that corresponds to a pressure difference between the first valve port side and the valve chamber side. A check valve port that is opened and closed by the check valve body, and the storage chamber is continuously provided in an upper communication passage that communicates the valve chamber with the communication space, and the storage chamber and the valve chamber. The flow rate adjusting valve according to claim 5 , wherein and are always communicated with each other.

Images