JP6332945B2 - Flow path switching valve - Google Patents

Description

  The present invention relates to a flow path switching valve, for example, a flow path switching valve such as a three-way switching valve that switches a fluid flow direction (flow path).

  Conventionally, a ball valve using a ball-shaped valve body as disclosed in Patent Document 1 is known as a flow path switching valve for switching a fluid flow direction (flow path).

  The ball valve disclosed in Patent Document 1 includes a valve body having a flow path, a valve case having a valve chamber in which the valve body is rotatably accommodated, an inlet formed in the valve case, and at least one The inflow port and the outflow port are communicated with each other by the flow path by the rotation of the valve body, and the valve case and the valve body are sealed by packing attached to the valve case. It is.

JP 2005-308165 A

  By the way, in the said field | area, further size reduction, large capacity | capacitance, and power saving of the above-mentioned flow-path switching valve are requested | required, for example, in order to implement | achieve size reduction etc. by reducing the drive torque of a valve body. It is desired to reduce the load acting on the valve body as much as possible when the flow path is switched.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to reduce the load acting on the valve body as much as possible when switching the flow path and reduce the driving torque of the valve body. Another object of the present invention is to provide a flow path switching valve having a novel structure that can achieve further miniaturization, large capacity, power saving, and the like.

To solve the problem of the flow path switching valve according to the present invention includes a tubular valve body at both ends have a internal passage is open, the valve body having a bottom made valve Shitsugae, wherein passage having a driver you driven in the direction of the bottom portion along the valve body in the valve chamber to the axis, and a spring for urging the valve body in a direction opposite to the driving direction of the drive unit The valve body is supported by the valve body and is slidably accommodated in the valve chamber, and the valve body opens to the internal flow path at a central side portion of the valve body. A communication port is formed, and the valve body includes an inlet port that communicates with the internal flow path through the communication port of the valve body when the valve body moves in the valve chamber, and one end of the valve body. a first outlet and the second outlet port is formed that communicates with the internal passage through the side opening and the other end side opening, the spring, the valve It is characterized in that provided between the bottom and the stepped portion provided on the inner peripheral surface of the valve body of the body.

  In a preferred embodiment, the valve body is provided with an inner wall for transmitting a driving force by the drive unit to the valve body.

  In a further preferred embodiment, the communication port is formed so as to open to both the first internal channel on one end side and the second internal channel on the other end side relative to the internal wall, or the communication port. A plurality of ports are formed, and each communication port is opened to a first internal channel on one end side and a second internal channel on the other end side than the internal wall.

  In a further preferred embodiment, the internal wall is formed with a communication path that connects the first internal flow path on one end side with respect to the internal wall and the second internal flow path on the other end side. Yes.

  In another preferred embodiment, a valve seat that contacts and separates from one end or the other end of the valve body is formed by an inclined surface provided on a wall surface that defines the valve chamber.

  In another preferred embodiment, a seal member that seals between the outer peripheral surface of the valve body and the inner peripheral surface of the valve body is disposed in an annular groove formed on the inner peripheral surface of the valve body. Or the sealing member which seals between the outer peripheral surface of the said valve body and the inner peripheral surface of the said valve main body is arrange | positioned by the annular groove formed in the outer peripheral surface of the said valve body, It is characterized by the above-mentioned.

  In a further preferred form, the seal member is arranged between the communication port of the valve body and the one end side opening and between the communication port and the other end side opening.

  In another preferred embodiment, a step portion having an inner diameter that increases toward one end side or the other end side of the valve body is provided inside the valve body.

  In another preferred embodiment, an inner diameter of the valve body is increased at a portion where the inlet, the first outlet, or the second outlet is formed, and an outer diameter of the valve body is the communication port, The one end side opening or the other end side opening is formed to be small.

  In another preferred embodiment, the drive unit includes a planetary gear speed reduction mechanism.

  According to the flow path switching valve of the present invention, the communication valve opening to the internal flow path is formed in the side portion of the cylindrical valve body, and the valve body moves when the valve body moves in the valve chamber. And an inflow port that communicates with the internal flow path through the communication port of the valve body, and a first outflow port and a second outflow port that communicate with the internal flow path through the one end side opening and the other end side opening of the valve body. Because of this, the force acting on the moving direction (axial direction) of the valve body when switching the flow path due to the movement of the valve body is balanced (the differential pressure is canceled), and the load acting on the valve body when switching the flow path As a result, the driving torque of the valve body can be reduced to further reduce the size, increase the capacity, and save power.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the whole structure of 1st Embodiment of the flow-path switching valve concerning this invention. The longitudinal cross-sectional view explaining the state in which the fluid is flowed from an inflow port to a 1st outflow port in the flow-path switching valve shown in FIG. The longitudinal cross-sectional view explaining the state in which the fluid is flowed from an inflow port to a 2nd outflow port in the flow-path switching valve shown in FIG. FIG. 2 is a perspective view showing a part of the valve body of the flow path switching valve shown in FIG. 1 (a range of 90 degrees in the circumferential direction), wherein (a) is a perspective view seen obliquely from above, and (b) is a perspective view. The perspective view seen from diagonally downward. The longitudinal cross-sectional view which shows the whole structure of 2nd Embodiment of the flow-path switching valve concerning this invention. FIG. 6 is a longitudinal cross-sectional view illustrating a state in which fluid flows from the inlet to the first outlet in the flow path switching valve shown in FIG. 5. The longitudinal cross-sectional view explaining the state in which the fluid is poured from the inflow port to the 2nd outflow port in the flow-path switching valve shown in FIG. The longitudinal cross-sectional view which shows the whole structure of 3rd Embodiment of the flow-path switching valve concerning this invention. The longitudinal cross-sectional view which shows the whole structure of 4th Embodiment of the flow-path switching valve concerning this invention. 9 is a perspective view showing a part of the valve body of the flow path switching valve shown in FIG. 9 (a range of 90 degrees in the circumferential direction), in which (a) is a perspective view seen obliquely from above, and (b) is a perspective view. The perspective view seen from diagonally downward.

  Hereinafter, an embodiment of a flow path switching valve according to the present invention will be described with reference to the drawings. In the following, a mode in which a flow path switching valve using a stepping motor is mainly employed as an actuator will be described. However, for example, a flow path switching valve using a solenoid or the like may be employed as an actuator. .

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing the overall configuration of a first embodiment of a flow path switching valve according to the present invention, and FIG. 2 is a state in which fluid flows from the inlet to the first outlet in the flow path switching valve. FIG. 3 is a longitudinal sectional view for explaining a state in which the fluid flows from the inlet to the second outlet.

  The flow path switching valve 1 shown is mainly composed of a bottomed and substantially cylindrical valve body 5, a can 58 fixed to the valve body 5, and an internal space defined by the valve body 5 and the can 58. 5 is supported by the valve body 5 in a valve chamber 7 defined by the bearing member 15 having a substantially cylindrical female screw 15i fixedly disposed on the valve 5 and the bearing member 15 and the valve body 5, and is slidably received. The valve body 20 and a stepping motor (driving unit) 50 attached above the valve body 5 to move the valve body 20 up and down in the direction of the axis L.

  The valve body 5 has a valve chamber 7 defined therein, and a first outlet port 11a and a second outlet port 12a that open to the valve chamber 7 are formed in a side portion thereof so as to be separated from each other in the direction of the axis L. An inlet 13a is formed between the first outlet 11a and the second outlet 12a. More specifically, the first outlet 11a is formed to open to the upper end side of the valve chamber 7, and the second outlet 12a is formed to open to the lower end side of the valve chamber 7, 13 a is formed so as to open at substantially the center of the valve chamber 7. Here, the 1st outflow port 11a, the 2nd outflow port 12a, and the inflow port 13a are formed in the other side (180 degree space | interval) around the axis L (circumferential direction), when it sees by planar view. The positions of the first outlet port 11a, the second outlet port 12a, and the inlet port 13a in the axial center L direction and in the circumferential direction are appropriately determined according to the size of the flow path switching valve 1, the application location, and the like. Can be changed.

  Further, the valve body 5 is formed so that the inner diameter becomes large at the portion where the inlet 13a, the first outlet 11a, and the second outlet 12a are formed. In other words, the inner diameter of the valve body 5 is reduced in diameter between the inlet 13a and the first outlet 11a and between the inlet 13a and the second outlet 12a. Annular grooves 2a and 3a are formed in the inner peripheral surface between the first outlet 11a and between the inlet 13a and the second outlet 12a. The outer peripheral surface of the valve body 20 and the valve body are formed in the annular grooves 2a and 3a. Sealing members 2 and 3 such as O-rings for sealing between the inner peripheral surface of 5 are mounted. Further, a concave portion 6 having a bottom surface and a side surface composed of an inclined surface is formed on an inner peripheral surface (a wall surface defining the valve chamber 7) of the bottom of the valve body 5, and the inclined surface constituting the side surface of the concave portion 6 A valve seat 6a that is in contact with and separated from a lower end (other end) 22 of the valve body 20 to be described later is formed. In addition, the inner peripheral surface in the part between the 1st outflow port 11a and the inflow port 13a, and the part between the 2nd outflow port 12a and the inflow port 13a (namely, the part to which the internal diameter of the valve main body 5 is diameter-reduced). The upper end and the lower end of the valve are rounded so as to expand toward the portion where the first outlet 11a, the second outlet 12a, and the inlet 13a are formed (that is, the portion where the inner diameter of the valve body 5 is large). ing.

  Lateral conduit joints 11, 12, and 13 are attached to the first outlet 11 a, the second outlet 12 a, and the inlet 13 a formed on the side of the valve body 5, respectively.

  The valve body 5 is stepped upward and has a reduced diameter, and the lower end of a cylindrical can 58 having a ceiling is joined to the stepped upper opening of the valve body 5 by welding or the like. . Further, inside the upper opening of the valve body 5, a bearing member 15 with a cylindrical female screw 15i having a female screw 15i screwed on the inner peripheral surface is fixed by press fitting or the like. Of the inner peripheral surface of the bearing member 15, a portion above the portion where the female screw 15 i is screwed is a fitting insertion hole 15 a into which a lower portion of an output shaft 46 of a reduction mechanism 40 described later is fitted. An annular groove 15b for suppressing the inflow of foreign matter to the threaded portion and the influence of fluid is formed below the portion of the peripheral surface where the female screw 15i is screwed. Further, a recess 19 having a bottom surface and a side surface composed of an inclined surface is formed on the lower surface of the bearing member 15 (the wall surface defining the valve chamber 7), and a later-described valve is formed by the inclined surface constituting the side surface of the recess 19. A valve seat 19a that is in contact with and away from the upper end (one end) 21 of the body 20 is formed. Further, a reverse L-shaped communication hole 14 is formed in the bearing member 15 so as to allow communication between the lower valve chamber 7 and the inside of the can 58.

  The valve body 20 has a substantially cylindrical shape having an internal flow path S, and is slidably inserted into the valve chamber 7 defined by the valve body 5 and the bearing member 15. Here, the upper end 21 of the valve body 20 is a first valve body portion that comes into contact with and separates from the valve seat 19a provided in the concave portion 19 of the bearing member 15 when the valve body 20 moves in the valve chamber 7, The lower end 22 of the valve body 20 is a second valve body portion that comes into contact with and separates from the valve seat 6 a provided in the recess 6 of the valve body 5.

  Two communication ports 20 c and 20 d that open to the internal flow path S are formed on the side of the valve body 20. The two communication ports 20c and 20d are formed on the opposite side (180 degree interval) around the axis L when viewed in a plan view, and the communication ports 20c and 20d are valve bodies in the direction of the axis L. It is formed in a substantially central portion of 20 and has a substantially rectangular shape when viewed from the side (see FIG. 4). Accordingly, the valve body 20 has a shape in which the left and right sides of the substantially central portion are notched when viewed in a side view. Here, the position, size, shape, and the like of each communication port 20c, 20d are determined by the relationship between the inlet 13a of the valve body 5 and the internal flow path S of the valve body 20 when the valve body 20 moves in the valve chamber 7. Designed to always communicate.

  In addition, an inner wall 23 extending in a direction substantially perpendicular to the axis L is provided in the valve body 20 in order to transmit the driving force from the stepping motor 50 to the valve body 20. The inner wall 23 is formed integrally with the valve body 20 at a substantially central portion of the valve body 20, that is, at a portion where the communication ports 20c and 20d are formed. (A shape obtained by cutting a circle along two parallel straight lines) (see FIG. 4). The internal flow path S of the valve body 20 is divided by the internal wall 23 into a first internal flow path S1 on the upper end side and a second internal flow path S2 on the lower end side with respect to the internal wall 23, and the communication ports 20c and 20d. Is formed so as to open to both the first internal flow path S1 on the upper end side and the second internal flow path S2 on the lower end side than the internal wall 23. In addition, a stepped fitting hole 23a into which a ball seat 16 described later is fitted is formed in the central portion of the inner wall 23.

  Therefore, when the valve body 20 is inserted into the valve chamber 7 of the valve body 5, the inlet 13a of the valve body 5 and the first internal flow path S1 and the second internal flow path S2 of the valve body 20 are connected to the communication port 20c, 20d is always communicated via one or both of them (communication port 20c in FIGS. 1 to 3) (see FIGS. 2 and 3). In addition, the number, position, size, shape, etc. of the communication port formed in the side portion of the valve body 20 can be appropriately changed according to the position, size, shape, etc. of the inlet 13a of the valve body 5, The position, size, shape, and the like of the inner wall formed inside the valve body 20 can be changed as appropriate.

  In the inside of the valve body 20, step portions 24 and 26 having an inner diameter that increases toward the upper end side and the lower end side of the valve body 20 are provided, and a portion whose inner diameter increases toward the upper end side is the upper end side opening 20a. The portion whose inner diameter increases toward the lower end side is the lower end side opening 20b. The step portions 24 and 26 are respectively provided on the inner peripheral surface on the upper end side and the inner peripheral surface on the lower end side with respect to the inner wall 23 of the valve body 20, and by the step portion 26 provided on the inner peripheral surface on the lower end side, A spring receiver that receives the upper end portion of the compression spring 25 that biases the valve body 20 upward is formed. That is, the compression spring 25 made of a compression coil spring has its upper end abutted on a step 26 provided on the inner peripheral surface of the valve body 20 and its lower end abutted on the bottom surface of the recess 6 of the valve body 5. As described above, the valve body 20 is housed in a contracted state between the step portion 26 of the valve body 20 and the bottom surface of the concave portion 6 of the valve body 5.

  The outer diameter of the valve body 20 is a portion where the upper end side opening 20a, the lower end side opening 20b, and the communication ports 20c and 20d are formed, in other words, the inlet 13a, the first outlet 11a, and the first outlet of the valve body 5. It is formed to be slightly smaller in the vicinity of the portion where the two outlets 12a are formed.

  On the other hand, the stepping motor 50 is disposed inside a can 58 so as to be rotatable with respect to the can 58 and a rotor support member 56. And a rotor 57 fixed inside the upper portion. The stator 55 is externally fixed to the can 58. Further, on the inner peripheral side of the rotor 57, a sun gear 41 formed integrally with the rotor support member 56, a fixed ring gear 47 fixed to the upper end of the cylindrical body 43 fixed to the upper part of the bearing member 15, the sun A planetary gear 42 that is disposed between the gear 41 and the fixed ring gear 47 and meshes with each other, a carrier 44 that rotatably supports the planetary gear 42, and a bottomed ring-shaped output that meshes with the planetary gear 42 from the outside. A mysterious planetary gear speed reduction mechanism 40 including an output shaft 46 and the like whose upper portion is fixed by press fitting or the like in a hole formed in the bottom of the gear 45 and the output gear 45 is provided. Here, the number of teeth of the fixed ring gear 47 is set to be slightly different from the number of teeth of the output gear 45.

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

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

  The lower end of the rotary lift shaft 17 extends through the valve chamber 7 to the vicinity of the inner wall 23 in the valve body 20, and the downward thrust of the rotary lift shaft 17 is applied to, for example, a ball 18 provided on the rotary lift shaft 17. And is transmitted to the inner wall 23 of the valve body 20 through the ball receiving seat 16 mounted in the fitting hole 23a of the inner wall 23. In addition, by interposing the ball 18 between the rotary lift shaft 17 and the inner wall 23, for example, even if the rotary lift shaft 17 descends while rotating, only the downward thrust from the rotary lift shaft 17 to the inner wall 23 is achieved. Is transmitted, and rotational force is not transmitted.

  As described above, the compression spring 25 is mounted between the step portion 26 of the valve body 20 and the bottom surface of the recess 6 of the valve body 5, and the urging force (push-up force) of the compression spring 25 is used. When the inner wall 23 of the valve body 20 is pressed against the rotary lift shaft 17 through the ball 18 and the ball seat 16 and the rotor 57 of the motor 50 is driven to rotate, the rotary lift shaft 17 and the valve body 20 are integrated. Ascend and descend in the direction of the axis L.

  Therefore, when the rotor 57 of the motor 50 is rotationally driven in one direction, the rotation of the rotor 57 is transmitted to the rotary lift shaft 17 through the output shaft 46 of the speed reduction mechanism 40 and transmitted to the female screw 15i of the bearing member 15 with the female screw. For example, the rotary lift shaft 17 is lowered while being rotated by screw feeding by the male screw 17a of the rotary lift shaft 17, and the valve body 20 is pushed down against the biasing force of the compression spring 25 by the thrust of the rotary lift shaft 17, and finally Specifically, the second valve body portion composed of the lower end 22 of the valve body 20 is seated on the valve seat 6a provided in the recess 6 of the valve body 5, and the lower end side opening 20b is closed. Thereby, the fluid (refrigerant) flows from the conduit joint 13 connected to the inlet 13a to the conduit joint 11 connected to the first outlet 11a via the communication port 20c and the upper end side opening 20a of the valve body 20 (FIG. 2).

  On the other hand, when the rotor 57 of the motor 50 is rotationally driven in the other direction, the rotation of the rotor 57 is decelerated and transmitted to the rotary lift shaft 17 via the output shaft 46 of the speed reduction mechanism 40, and is transmitted by the female screw 15i and the male screw 17a. For example, the rotary lift shaft 17 is raised while being rotated by screw feed, and the valve body 20 is pulled up by the urging force of the compression spring 25, and the second valve body portion including the lower end 22 of the valve body 20 is the valve body 5. The lower end side opening 20b is opened away from the valve seat 6a provided in the recess 6 and finally the first valve body portion including the upper end 21 of the valve body 20 is provided in the recess 19 of the bearing member 15. The upper end opening 20a is closed by sitting on the valve seat 19a. Thereby, the fluid (refrigerant) flows from the conduit joint 13 connected to the inlet 13a to the conduit joint 12 connected to the second outlet 12a via the communication port 20c and the lower end opening 20b of the valve body 20 (see FIG. 3).

  In the first embodiment, the lower end 22 or the upper end 21 of the valve body 20 is seated on the valve seat 6 a provided in the concave portion 6 of the valve body 5 or the valve seat 19 a provided in the concave portion 19 of the bearing member 15. Even in the state where the side opening 20b or the upper end opening 20a is closed, the first internal flow path S1 on the upper end side and the second internal flow path S2 on the lower end side in the valve body 20 are connected via the communication ports 20c and 20d. Communicate. Therefore, the fluid (refrigerant) flowing in from the conduit joint 13 connected to the inflow port 13a flows through both the first internal flow path S1 and the second internal flow path S2 in the valve body 20 through the communication ports 20c and 20d. That is, it flows into the entire tubular valve body 20. Therefore, the force (the push-down force and the push-up force acting on the valve body 20) acting in the movement direction (the axis L direction) of the valve body 20 when the flow path is switched by the movement of the cylindrical valve body 20 in the axis L direction. Can be balanced (differential pressure can be canceled), the load acting on the valve body 20 when switching the flow path can be made as small as possible, and the driving torque of the valve body 20 by the stepping motor 50 can be reduced.

  In particular, in the first embodiment, a valve seat 19a that contacts and separates from the upper end (one end) 21 and the lower end (other end) 22 of the valve body 20 by an inclined surface provided on a wall surface that defines the valve chamber 7, 6a is formed. Accordingly, the lower end 22 or the upper end 21 of the valve body 20 is seated on the valve seat 6a provided in the recess 6 of the valve body 5 or the valve seat 19a provided in the recess 19 of the bearing member 15, and the lower end side opening 20b or the upper end Even when the side opening 20a is closed, the upper end surface and the lower end surface of the valve body 20 and the fluid (refrigerant) in the valve chamber 7 can be brought into contact with each other. It is possible to precisely balance (cancel the differential pressure) the force acting in the moving direction (axial center L direction) of the valve body 20 when the flow path is switched by moving in the direction.

  Further, in the first embodiment, an annular groove 2 a formed on the inner peripheral surface of the valve body 5 is a seal member 2, 3 that seals between the outer peripheral surface of the valve body 20 and the inner peripheral surface of the valve body 5. 3a, each communication port 20c, 20d is formed to open to both the first internal flow path S1 on the upper end side and the second internal flow path S2 on the lower end side than the internal wall 23. Moreover, the step parts 24 and 26 are provided in the inner peripheral surface of the upper end side and lower end side rather than the inner wall 23 of the valve body 20, and the said valve body 20 is formed symmetrically vertically. Therefore, the shape and structure of the valve body 20 arranged in the valve chamber 7 can be simplified.

  In the first embodiment, the outer diameter of the valve body 20 is formed to be slightly smaller at the portion where the communication ports 20c and 20d, the upper end side opening 20a, and the lower end side opening 20b are formed. The inner diameter of the valve body 5 is a portion where the inlet 13a, the first outlet 11a, and the second outlet 12a are formed, particularly (the portion where the first outlet 11a on the upper end side of the valve chamber 7 is formed). It is formed to be large. Furthermore, the upper end and the lower end of the inner peripheral surface of the portion between the first outlet 11a and the inlet 13a and the portion between the second outlet 12a and the inlet 13a are the first outlet 11a and the second outlet. R is attached so that it may expand toward the part in which the exit 12a and the inflow port 13a were formed. Therefore, there is an advantage that the valve body 20 can be easily fitted into the valve chamber 7 of the valve body 5 and the assembly process of the valve body 20 can be greatly simplified.

[Second Embodiment]
FIG. 5 is a longitudinal sectional view showing the overall configuration of the second embodiment of the flow path switching valve according to the present invention, and FIG. 6 shows a state in which fluid flows from the inlet to the first outlet in the flow path switching valve. FIG. 7 is a vertical cross-sectional view for explaining a state in which fluid flows from the inflow port to the second outflow port. 1 A of flow-path switching valves of 2nd Embodiment are arrangement structure of the sealing member which seals between the outer peripheral surface of a valve body, and the internal peripheral surface of a valve main body with respect to the above-mentioned flow-path switching valve 1 of 1st Embodiment. The other configurations are substantially the same as those of the flow path switching valve 1 of the first embodiment. Accordingly, the same components as those of the flow path switching valve 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the flow path switching valve 1A of the second embodiment, the outer periphery of the valve body 20A between the upper end side opening 20aA and the communication ports 20cA and 20dA and between the lower end side opening 20bA and the communication ports 20cA and 20dA. Annular grooves 27aA and 28aA are formed on the surface (that is, the portion corresponding to the portion between the inlet 13aA and the first outlet 11aA and the portion between the inlet 13aA and the second outlet 12aA of the valve body 5A), Seal members 27A, 28A such as O-rings for sealing between the outer peripheral surface of the valve body 20A and the inner peripheral surface of the valve body 5A are mounted in the annular grooves 27aA, 28aA.

  More specifically, the valve body 20A is composed of a divided body obtained by dividing the valve body 20 of the first embodiment into three in the axial direction, and has an upper end having a stepped portion 24A and having an upper end side opening 20aA. It is disposed between the side cylindrical portion 31A, the lower end side cylindrical portion 32A having the stepped portion 26A formed therein and having the lower end side opening 20bA, and the upper end side cylindrical portion 31A and the lower end side cylindrical portion 32A. One communication port 20cA, 20dA is formed, and it has a central cylindrical portion 33A in which an inner wall 23A is formed.

  Here, the outer peripheral surfaces of the upper end side cylindrical portion 31A and the lower end side cylindrical portion 32A are formed with steps so as to reduce the diameter toward the central cylindrical portion 33A, while the upper end side and the lower end side of the central cylindrical portion 33A. The inner peripheral surface is formed with a step so as to increase in diameter toward the upper end side cylindrical portion 31A and the lower end side cylindrical portion 32A. The lower end of the reduced diameter portion on the central cylindrical portion 33A side of the upper cylindrical portion 31A is fixed inside the upper cylindrical portion 33A by press-fitting or the like, and the lower cylindrical portion is placed inside the lower cylindrical portion of the central cylindrical portion 33A. The upper end of the reduced diameter portion on the side of the central cylindrical portion 33A of 32A is fixed by press fitting or the like, so that the upper end side cylindrical portion 31A, the central cylindrical portion 33A, and the lower end side cylindrical portion 32A are integrally formed, and the valve Annular grooves 27aA and 28aA in which the sealing members 27A and 28A are mounted are formed on the outer peripheral surface of the body 20A.

  That is, in the second embodiment, the sealing member 27A is extrapolated to the reduced diameter portion of the upper cylindrical portion 31A on the central cylindrical portion 33A side, and the central cylinder of the upper cylindrical portion 31A is placed inside the upper cylindrical portion 33A. By fixing the lower end of the reduced diameter portion on the side of the portion 33A, the seal member 27A is mounted on the outer peripheral surface between the upper end side opening 20aA and the communication ports 20cA, 20dA. Further, the sealing member 28A is extrapolated to the reduced diameter portion of the lower end side cylindrical portion 32A on the central cylindrical portion 33A side, and the reduced diameter portion of the lower end side cylindrical portion 32A on the central cylindrical portion 33A side is inserted inside the lower end side of the central cylindrical portion 33A. By fixing the upper end of the sealing member 28A, the seal member 28A is mounted on the outer peripheral surface between the lower end opening 20bA and the communication ports 20cA, 20dA.

  The seal members 27A and 28A are portions where the inner diameter of the valve body 5A is reduced when the valve body 20A moves in the axis L direction (that is, between the inlet 13aA and the first outlet 11aA and the The portion between the inlet 13aA and the second outlet 12aA) is disposed at a position in sliding contact.

  Therefore, in the flow path switching valve 1A of the second embodiment, similarly to the flow path switching valve 1 of the first embodiment described above, when the flow path is switched by the movement of the cylindrical valve body 20A in the direction of the axis LA. The force acting in the moving direction of the valve body 20A can be balanced (differential pressure can be canceled), the shape and configuration of the valve body 5A can be simplified, and the valve body 20A can be inserted into the valve chamber 7A. The assembly process of the flow path switching valve 1A including the process can be simplified.

  In the flow path switching valve 1A of the second embodiment, the outer diameter of the valve body 20A is formed substantially constant in the direction of the axis LA.

[Third Embodiment]
FIG. 8 is a longitudinal sectional view showing the overall configuration of the third embodiment of the flow path switching valve according to the present invention. The flow path switching valve 1B of the third embodiment is different from the flow path switching valve 1 of the first embodiment described above in the internal shape of the valve body, and the other configurations are the flow path switching valve of the first embodiment. It is almost the same as the valve 1. Accordingly, the same components as those of the flow path switching valve 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the flow path switching valve 1B of the third embodiment, the step on the inner peripheral surface on the upper end side of the inner wall 23B of the valve body 20B (step 24 in the first embodiment) is omitted, and the upper end of the inner wall 23B. The inner diameter on the side (first inner flow path S1B side) is constant, and the inner diameter is larger than the inner diameter of the first embodiment.

  In the flow path switching valve 1B of the third embodiment, similar to the flow path switching valve 1 of the first embodiment described above, the valve body is switched when the flow path is switched by the movement of the cylindrical valve body 20B in the direction of the axis LB. The force acting in the moving direction of 20B can be balanced (differential pressure can be canceled), and the internal flow path SB of the valve body 20B, particularly the first internal flow path S1B on the upper end side of the internal wall 23B of the valve body 20B. The flow path area can be set large. Therefore, it is possible to sufficiently secure the flow rate of the fluid (refrigerant) flowing from the conduit joint 13B connected to the inlet 13aB to the conduit joint 11B connected to the first outlet 11aB.

[Fourth Embodiment]
FIG. 9 is a longitudinal sectional view showing the overall configuration of the fourth embodiment of the flow path switching valve according to the present invention. The flow path switching valve 1C of the fourth embodiment differs from the flow path switching valve 1B of the third embodiment described above in the configuration of the communication port of the valve body and the inner wall, and the other configurations are the third embodiment. This is substantially the same as the flow path switching valve 1B of the embodiment. Therefore, the same components as those of the flow path switching valve 1B of the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the flow path switching valve 1C of the fourth embodiment, a total of eight communication lines are provided at 90 ° intervals around the axis LC when viewed in a plan view in two rows in the direction of the axis LC at the side of the valve body 20C. Mouth 20caC-20faC and 20cbC-20fbC are formed. Four communication ports 20caC to 20faC in the upper row open to the first internal flow path S1C on the upper end side with respect to the inner wall 23C, and four communication ports 20cbC to 20fbC in the lower row have a lower end side than the inner wall 23C. 2 It is formed to open to the internal flow path S2C. Each of the communication ports 20caC to 20faC and 20cbC to 20fbC has a substantially circular shape when viewed from the side (see FIG. 10). Here, the positions, sizes, shapes, and the like of the communication ports 20caC to 20faC and 20cbC to 20fbC are the same as the communication ports formed side by side in the axial center LC direction when the valve body 20C moves in the valve chamber 7C. The inflow port 13aC of the valve body 5C and the internal flow path SC of the valve body 20C are designed to always communicate with each other.

  Further, the inner wall 23C provided inside the valve body 20 is formed between the communication ports 20caC to 20faC and the communication ports 20cbC to 20fbC formed side by side in a substantially central portion of the valve body 20C, that is, in the axial center LC direction. The portion is formed integrally with the valve body 20C, and therefore has a substantially circular shape when viewed in plan view (see FIG. 10). The internal flow path SC of the valve body 20C is divided by the internal wall 23C into a first internal flow path S1C on the upper end side and a second internal flow path S2C on the lower end side, as described above. The upper row of four communication ports 20caC to 20faC and the lower row of four communication ports 20cbC to 20fbC are connected to the first internal channel S1C on the upper end side and the second internal channel S2C on the lower end side with respect to the inner wall 23C. Each is formed to open.

  In addition, the inner wall 23C is provided with four communication channels at intervals of 90 degrees around the axis LC so as to communicate the first inner flow path S1C on the upper end side with respect to the inner wall 23C and the second internal flow path S2C on the lower end side. A passage 29C is formed along the direction of the axis LC.

  Therefore, when the valve body 20C is inserted into the valve chamber 7C of the valve body 5C, the inlet 13aC of the valve body 5C and the first internal flow path S1C and the second internal flow path S2C of the valve body 20C are connected to the communication ports 20caC to 20caC. 20faC and 20cbC to 20fbC are always in communication with each other via at least two communication ports (in FIG. 9, the communication port 20caC and the communication port 20cbC) formed side by side in the axial center LC direction.

  Also in the fourth embodiment, as in the first to third embodiments described above, the lower end 22C or the upper end 21C of the valve body 20C is the valve seat 6aC provided in the recess 6C of the valve body 5C or the recess 19C of the bearing member 15C. Even when the lower end side opening 20bC or the upper end side opening 20aC is closed while seated on the valve seat 19aC provided on the upper end side, the first internal flow path S1C on the upper end side in the valve body 20C and the second inner side on the lower end side The flow path S2C communicates with the communication ports 20caC to 20faC and 20cbC to 20fbC formed in two rows in the axial center LC direction and the communication path 29C formed in the inner wall 23C. Therefore, the fluid (refrigerant) flowing in from the conduit joint 13C connected to the inflow port 13aC passes through the communication ports 20caC to 20faC, 20cbC to 20fbC and the communication passage 29C, and the first internal flow path S1C and the first internal flow path S1C in the valve body 20C. It flows in both 2 internal flow paths S2C, ie, the whole inside of the cylindrical valve body 20C. Therefore, the force acting in the moving direction (axial center LC direction) of the valve body 20C (the push-down force and the pushing-up force acting on the valve body 20C) when the flow path is switched by the movement of the cylindrical valve body 20C in the axial center LC direction. Can be balanced (differential pressure can be canceled), the load acting on the valve body 20C when switching the flow path can be made as small as possible, and the driving torque of the valve body 20C by the stepping motor 50C can be reduced.

  In the fourth embodiment, the communication ports that open to the internal flow path SC of the valve body 20C are formed side by side in the axial center LC direction, and each communication port is a first internal flow on the upper end side of the inner wall 23C. Since the openings are made in the path S1C and the second inner flow path S2C on the lower end side, the opening area of each communication port can be optimized. Therefore, the strength of the valve body 20C can be ensured while simplifying the shape and configuration of the valve body 20C disposed in the valve chamber 7C.

  In the above-described fourth embodiment, in order to simplify the configuration of the valve body 20C, among the communication ports formed in two rows in the axial center LC direction, the upper four communication ports 20caC to 20faC. And the four communication ports 20cbC to 20fbC in the lower row have been described as being formed at the same position around the axis LC when viewed in a plan view. However, the four communication ports 20caC to 20faC in the upper row and the four communication ports 20cab to 20faC in the lower row have been described. Of course, the two communication ports 20cbC to 20fbC may be formed at different positions around the axis LC.

  In the first to fourth embodiments described above, the mode in which the fluid (refrigerant) flows from the conduit joint connected to the inlet to the conduit joint connected to the first outlet or the second outlet is described. Of course, the fluid may flow from a conduit joint connected to the first outlet or the second outlet to a conduit joint connected to the inlet. Further, for example, the valve body is stopped at a position as shown in FIG. 1 or FIG. 5, and the fluid (refrigerant) is connected to the first outlet from the conduit joint connected to the inlet and the second outlet. May flow simultaneously to both of the conduit fittings connected to.

  Furthermore, in the first to fourth embodiments described above, the inlets 13a, 13aA, 13aB, and 13aC are substantially intermediate between the first outlets 11a, 11aA, 11aB, and 11aC and the second outlets 12a, 12aA, 12aB, and 12aC. However, the present invention is not particularly limited to this, and the first outlet and the second outlet are located in the middle of the first outlet and the second outlet. It may be provided biased. In this case, depending on the amount of deviation, the communication ports 20c, 20d, 20cA, 20dA, 20cB, 20dB, 20caC, 20cbC, 20daC, 20dbC, etc. formed on the side of the valve body, What is necessary is just to adjust the formation position of the inner walls 23, 23A, 23B, and 23C to be formed.

DESCRIPTION OF SYMBOLS 1 Flow path switching valve 2 Seal member 2a Annular groove 3 Seal member 3a Annular groove 5 Valve body 6 Recess 6a Valve seat 11 Valve chamber 11 Conduit joint 11a First outlet 12 Conduit joint 12a Second outlet 13 Conduit joint 13a Inlet 14 communication hole 15 bearing member 15a fitting insertion hole 15i female screw 16 ball seat 17 rotary elevating shaft 17a male screw 18 ball 19 recess 19a valve seat 20 valve body 20a upper end side opening (one end side opening)
20b Lower end side opening (other end side opening)
20c, 20d Communication port 21 Upper end (one end) of valve body (first valve body portion)
22 Lower end (other end) of valve body (second valve body part)
23 inner wall 23a fitting hole 24, 26 step 25 compression spring 27A, 28A seal member 29C communication path 40 strange planetary gear type reduction mechanism 50 stepping motor (drive part)
55 Stator 57 Rotor 58 Can L Axle S Internal flow path S1 First internal flow path S2 Second internal flow path

Claims (13)

Driving the internal passage chromatic and both ends open ended tubular valve body, a valve body having a bottom made valve Shitsugae, said valve body in said valve chamber in the direction of the bottom portion along its axis a driver you, the driving direction of the driving unit a flow path switching valve that includes a spring for urging the valve body in the opposite direction,
The valve body is slidably accommodated in the valve chamber with its outer peripheral surface supported by the valve body,
A communication port that opens to the internal flow path is formed in a central side portion of the valve body,
The valve body includes an inlet that communicates with the internal flow path through the communication port of the valve body when the valve body moves in the valve chamber, an opening on one end side and the other end side of the valve body. A first outlet and a second outlet communicating with the internal flow path via the opening are formed;
The flow path switching valve , wherein the spring is provided between a bottom portion of the valve main body and a step portion provided on an inner peripheral surface of the valve body .   The flow path switching valve according to claim 1, wherein an inner wall for transmitting a driving force by the driving unit to the valve body is provided inside the valve body.   The said communication port is formed so that it may open to both the 1st internal flow path of the one end side from the said internal wall, and the 2nd internal flow path of the other end side. Flow path switching valve.   The plurality of communication ports are formed, and each communication port opens to a first internal flow channel on one end side and a second internal flow channel on the other end side than the internal wall, respectively. The flow path switching valve according to 1.   5. The communication path that connects the first internal flow path on one end side with respect to the internal wall and the second internal flow path on the other end side is formed in the internal wall. The flow path switching valve according to any one of the above.   The valve seat which contacts and separates from the one end or the other end of the said valve body is formed of the inclined surface provided in the wall surface which defines the said valve chamber, The any one of Claim 1 to 5 characterized by the above-mentioned. The flow path switching valve according to 1.   The seal member for sealing between the outer peripheral surface of the valve body and the inner peripheral surface of the valve main body is arranged in the annular groove formed in the inner peripheral surface of the valve main body. The flow path switching valve according to any one of 1 to 6.   The seal member which seals between the outer peripheral surface of the said valve body and the inner peripheral surface of the said valve main body is arrange | positioned by the annular groove formed in the outer peripheral surface of the said valve body. To 6. The flow path switching valve according to any one of items 1 to 6.   The said seal member is arrange | positioned between the said communicating port and the said one end side opening of the said valve body, and between the said communicating port and the said other end side opening, The Claim 7 or 8 characterized by the above-mentioned. The flow path switching valve described.   10. The step portion according to claim 1, wherein a step portion whose inner diameter increases toward one end side or the other end side of the valve body is provided inside the valve body. Channel switching valve.   The internal diameter of the said valve main body becomes large in the part in which the said inflow port, the said 1st outflow port, or the said 2nd outflow port was formed, The flow as described in any one of Claim 1 to 10 characterized by the above-mentioned. Road switching valve.   The flow according to any one of claims 1 to 11, wherein an outer diameter of the valve body is reduced at a portion where the communication port, the one end side opening, or the other end side opening is formed. Road switching valve.   The flow path switching valve according to any one of claims 1 to 12, wherein the drive unit includes a planetary gear speed reduction mechanism.

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