JP6979705B2 - Flow switching valve - Google Patents

Description

The present invention relates to a flow path switching valve in which a valve body having a U-turn communication path formed of a U-turn-shaped communication space is arranged in a housing, and particularly performs flow path switching in a heat pump type heating / cooling system or the like. The present invention relates to a flow path switching valve suitable for the above.

Conventionally, a flow path switching valve such as a four-way switching valve or a six-way switching valve has been well known as a flow path (flow direction) switching means of a heat pump type heating / cooling system. As this type of flow path switching valve, a slide type valve body in which a slide valve body is slidably arranged in a cylinder type housing and a rotary valve body in which a rotary valve body is rotatably arranged in a cylindrical housing are arranged. There is a rotary type. Further, a valve in which a U-turn-shaped communication space (hereinafter referred to as a U-turn communication passage) for communicating adjacent ports is formed in this flow path switching valve so as to selectively communicate between ports provided in the housing. It is also known to use a body (see, for example, Patent Document 1 below).

FIG. 7 shows a conventional flow path switching valve. The flow path switching valve of the conventional example shown is, for example, a slide type four-way switching valve 1'used for flow path switching in a heat pump type heating / cooling system, and is a cylinder type housing 80 and a valve provided in the housing 80. Port pC, port pS (low pressure port), port pE, and valve seat surface provided laterally in the left-right direction, which are opened in the seat member 81 and the valve seat surface 82 formed on the upper surface of the valve seat member 81. It has a valve body (slide valve body) 10 having an inverted bowl-shaped cross section and is slidably arranged on the 82 in the left-right direction.

The valve body 10 has a sealing surface 12 facing the valve seat surface 82, and in the valve body 10, the three ports pC, pS, and pE are selectively communicated with each other, in other words, with the port pS. A U-turn communication passage 15 is provided in order to create a first communication state in which the port pE is communicated and a second communication state in which the port pS and the port pC are communicated with each other.

The lid members 87A and 87B are airtightly fixed to both ends of the housing 80, and the inside of the housing 80 is airtightly partitioned by two pistons 84A and 84B with packings on the left and right, and a valve chamber 83 and two operating chambers. 86A and 86B are defined. A port pD (high pressure port) connected to the discharge side of the compressor is opened in the valve chamber 83.

The two pistons 84A and 84B are integrally movably connected by a horizontally long rectangular plate-shaped connecting body 70. The connecting body 70 is formed with an opening 72 into which the valve body 10 is slidably fitted from below, and the valve body 10 is formed by the reciprocating movement of the two pistons 84A and 84B. The right end position (first communication state) in which the port pE and the port pS are communicated via the U-turn communication passage 15 pushed by the opening 72 portion and formed inside the opening, and the port pC and the port pS are communicated with each other. It is designed to slide between the left end position (second communication state) and the left end position. Note that FIG. 7 shows the second communication state.

Further, the connecting body 70 is formed with circular openings 75 on the left and right sides of the opening 72.

The two operating chambers 86A and 86B are selectively connected to the compressor discharge side and the compressor suction side via a four-way pilot valve (not shown in FIG. 7, shown in FIG. 1), and the two operating chambers 86A are connected. , 86B is used to move the pistons 84A and 84B, and the valve body 10 is slid on the valve seat surface 82 to switch the flow path.

Further, the valve body 10 (seal surface 12) on which the U-turn communication passage 15 is formed as described above has a high-pressure fluid flowing on the outside (inside the valve chamber 83) and the inside thereof (inside the U-turn communication passage 15). It is strongly pressed against the valve seat surface 82 by the pressure difference with the low-pressure fluid flowing through the U-turn, whereby the U-turn communication passage 15 is sealed (sealing property is ensured).

Japanese Unexamined Patent Publication No. 2013-227989 Japanese Unexamined Patent Publication No. 2017-155887

By the way, for example, in a normal slide type flow path switching valve, if a part of the port as a valve port is closed, the opening area (fluid passage area) of the flow path decreases. Therefore, as shown in FIG. 7, the valve port It has been considered that the valve body is arranged so as not to block the port, which makes it easier to secure the Cv value (corresponding to the flow rate) (see also Patent Document 2 above).

Further, it has been considered that the optimum flow path is usually when the peripheral edge (inner peripheral edge) of the port and the opening edge of the U-turn communication path as the inner diameter portion of the valve body overlap almost flush with each other.

Therefore, when further increasing the Cv value, the height of the U-turn communication passage is increased to make a more beautiful U-turn shape (turn part is a perfect R shape), or the port diameter (valve diameter) is changed. It was necessary to increase the size, and it was necessary to expand and expand the outer diameter of the housing and the piping pitch, which was a factor in increasing the overall size and cost.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a flow path switching valve capable of effectively improving a Cv value without requiring an increase in body size and cost. To do.

In order to achieve the above object, the flow path switching valve according to the present invention basically includes a cylinder type housing, a valve body movably arranged in the housing in the axial direction, and the valve body. The valve body is provided with a valve seat surface that is face-to-face and has a plurality of ports opened side by side in the axial direction, and the valve body is a U-turn communication passage having a size for communicating adjacent ports among the plurality of ports. And can take a plurality of communication states that selectively communicate between the ports via the U-turn communication path, and when the valve body takes a predetermined communication state, among the adjacent ports. The axial end of the opening edge of the U-turn communication passage is arranged inside the peripheral edge of the port so as to block at least a part of the port on the exit side, and the blocking rate with respect to the entire opening of the port. the state, and are up to 13%, is characterized that you have been so that only a part of the port to which the outlet side port adjacent said is closed by the valve body.

The blockage rate is preferably up to 9%.

The blockage rate is more preferably 5%.

In another preferred embodiment, the opening edge of the U-turn passage is located at a pair of semicircular portions located at the axial end and at the end perpendicular to the axial direction and extends along the axial direction. It is composed of a pair of straight sections.

In another preferred embodiment, the axial end of the opening edge of the U-turn communication passage is configured with a surface perpendicular to the sealing surface that is in sliding contact with the valve seat surface.

Further, the flow path switching valve according to the present invention basically has a tubular housing, a valve body movably arranged in the housing, and the valve body is brought into contact with each other and has a plurality of ports. The valve body comprises a valve seat surface which is opened side by side, and the valve body has a U-turn communication passage having a size for communicating adjacent ports among the plurality of ports, and the valve body has a U-turn communication passage through the U-turn communication passage. It is possible to take a plurality of communication states for selectively communicating between the ports, and when the valve body takes a predetermined communication state, at least a part of the adjacent ports on the exit side is blocked. In addition, the parallel end of the adjacent port of the opening edge of the U-turn communication passage is arranged inside the peripheral edge of the port, and the blockage rate for the entire opening of the port is up to 13%. The valve body is configured to block only a part of the port on the exit side of the adjacent ports, and the valve body can rotate around a rotation axis parallel to the axis of the housing. It is characterized by having a rotating valve body distributed.

In the flow path switching valve having such a configuration, a difference in pressure balance in the port is seen in the outlet side flow path with respect to the inlet side flow path of the U-turn continuous passage, and in the port of the outlet side flow path and its vicinity. , The inside (that is, the adjacent port side) loses pressure, and the pressure is slightly lower than the outside (that is, the side opposite to the adjacent port side).

In the conventional flow path switching valve as described above, the axial end of the opening edge of the U-turn continuous passage is arranged at a position corresponding to the peripheral edge of the port or outside the peripheral edge of the port, and the port as a valve port. The valve body is arranged so as not to block the U-turn, and the cross-sectional area (fluid passage area) is basically the same between the exit side end of the U-turn passage and the port, or the port side is slightly. Since it is small, the fluid (refrigerant) that has flowed in from the port that is the inlet side flow path and has passed through the U-turn communication passage is totally (that is, inside the port) immediately after flowing out into the port that is the outlet side flow path. The pressure begins to drop (on the outside). That is, it is difficult to actually increase the Cv value (flow rate) because the pressure loss also occurs immediately after the high voltage on the outside flows out into the port which is the outlet side flow path.

In the flow path switching valve of the present invention, the axial end of the opening edge of the U-turn continuous passage (the end in the parallel direction of adjacent ports) is arranged inside the peripheral edge of the port, and at least the outlet side flow path. A part of the port is closed with a valve body, and the closing rate for the entire opening of the port is, for example, up to 13%, preferably up to 9%, and more preferably 5%. The fluid (refrigerant) that has flowed in from the U-turn and passed through the U-turn communication passage has a small pressure drop (particularly, a pressure drop outside the port) even after flowing out into the port that is the outlet side flow path. That is, since the high pressure on the outside is less likely to cause pressure loss even after flowing out into the port that is the outlet side flow path, the Cv value (flow rate) should be significantly increased as compared with the conventional flow path switching valve described above. Can be done.

Further, in the flow path switching valve of the present invention, it is sufficient to block a part of the port with a valve body, and it is not necessary to expand or expand the outer diameter of the housing or the piping pitch. I won't invite you.

The whole vertical sectional view which shows one Embodiment of the flow path switching valve which concerns on this invention. The bottom view of the valve body shown in FIG. An enlarged vertical sectional view of a main part provided for explaining the pressure distribution inside the valve body and the port in the present embodiment. An enlarged vertical sectional view of a main part provided for explaining the pressure distribution inside the valve body and the port in the conventional product. A characteristic diagram showing the relationship between the blockage rate and the Cv value (relative value). An enlarged vertical sectional view of a main part showing another embodiment of the flow path switching valve according to the present invention. A vertical sectional view showing a conventional flow path switching valve.

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

FIG. 1 is an overall vertical sectional view showing an embodiment of a flow path switching valve according to the present invention. FIG. 2 is a bottom view of the valve body shown in FIG. In FIG. 2, the positions of the ports pC, pS, and pE provided on the seat member are illustrated by virtual lines.

In addition, in this specification, the description indicating the position and direction such as up / down, left / right, front / back, etc. is added for convenience according to the drawing in order to avoid complicated explanation, and is actually incorporated in the air conditioning system or the like. It does not always point to the position or direction in the state.

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

The flow path switching valve of the illustrated embodiment is, for example, a slide type four-way switching valve 1 used for flow path switching in a heat pump type heating / cooling system, and includes a main valve 9 having a valve body (slide valve body) 10 built therein. It is equipped with a four-way pilot valve 8.

The main valve 9 opens into a cylinder-shaped (cylindrical) housing 80, a valve seat member 81 provided in the housing 80, and a flat and smooth valve seat surface 82 formed on the upper surface of the valve seat member 81. , Port pC, port pS (low pressure port), and port pE provided side by side in the left-right direction (length of housing 80 or axis O direction), and slidably arranged on the valve seat surface 82 in the left-right direction. It has a valve body 10 having an inverted bowl-shaped cross section.

The valve body 10 is made of, for example, a synthetic resin, and has a sealing surface 12 that faces (faces) the valve seat surface 82, and the three ports are inside the valve body 10, that is, inside the sealing surface 12. To selectively communicate pC, pS, and pE, in other words, to create a first communication state in which port pS and port pE communicate with each other, and a second communication state in which port pS and port pC communicate with each other. , U-turn communication passage 15 is provided.

The lid members 87A and 87B are airtightly fixed to both ends of the housing 80, and the inside of the housing 80 is airtightly partitioned by two (pair) packing pistons 84A and 84B on the left and right. Two working chambers 86A and 86B are defined. A port pD (high pressure port) connected to the discharge side of the compressor is opened in the valve chamber 83 (in the illustrated example, a position facing the central port pS).

The two pistons 84A and 84B are integrally movably connected by a horizontally long rectangular plate-shaped connecting body 70. The connecting body 70 is formed with a rectangular opening 72 into which the valve body 10 is slidably fitted from below, and the valve body 10 is connected as the two pistons 84A and 84B reciprocate. The right end position (first communication state) that is pushed by the opening 72 portion of the body 70 and communicates the port pE and the port pS (low pressure port) via the U-turn communication passage 15 formed inside the body 70, and the port. It is made to slide between the left end position (second communication state) in which the pC and the port pS (low pressure port) are communicated with each other. Note that FIG. 1 shows the second communication state.

Further, in the connecting body 70, a circular opening 75 is formed on the left and right sides of the opening 72, that is, at a portion located substantially directly above the port pC on the left side when the valve body 10 takes the right end position (first communication state). At the same time, when the valve body 10 takes the left end position (second communication state), a circular opening 75 is formed in a portion located substantially directly above the port pE on the right side.

In the main valve 9, the two operating chambers 86A and 86B are selectively connected to the compressor discharge side and the compressor suction side via the four-way pilot valve 8 and the thin tubes # 1 to # 4, and the two actuation chambers 86A and 86B are operated. The pistons 84A and 84B are moved by utilizing the pressure difference between the chambers 86A and 86B, and the valve body 10 is slid on the valve seat surface 82 accordingly to switch the flow path.

Further, the valve body 10 (seal surface 12) on which the U-turn communication passage 15 is formed as described above has a high-pressure fluid flowing on the outside (inside the valve chamber 83) and the inside thereof (inside the U-turn communication passage 15). It is strongly pressed against the valve seat surface 82 by the pressure difference with the low-pressure fluid flowing through the U-turn, whereby the U-turn communication passage 15 is sealed (sealing property is ensured).

Next, the circumference of the valve body 10, which is the main part of the four-way switching valve (flow path switching valve) 1 of the above embodiment, will be described in detail.

In the present embodiment, as can be clearly seen with reference to FIG. 2, the inner edge portions 12C of the annular sealing surface 12 of the valve body 10 are a pair of left and right semicircular portions 13A located at both ends in the left-right direction (longitudinal direction). , 13B, which are located at both ends in the front-rear direction (short direction) and extend along the longitudinal direction, and a pair of front-rear straight lines 14A connecting the pair of left and right semi-circular portions 13A and 13B (ends). , 14B and has a schematic race track shape in plan view.

The diameters of the pair of left and right semicircular portions 13A and 13B and the distance between the pair of front and rear straight portions 14A and 14B are slightly larger than the diameters (inner diameters) of the ports pC, pS and pE opened in the valve seat surface 82. It has been enlarged.

Further, the U-turn communication passage 15 provided inside the seal surface 12 of the valve body 10 is an adjacent port (that is, the valve seat surface 82 side where the ports pC, pS, and pE are opened) is open. It has a substantially inverted U-shape or concave shape in a side view having a size that allows pC-pS or pS-pE) to communicate with each other.

The opening edge portion 15C of the U-turn continuous passage 15 has a pair of left and right semicircular portions 16A and 16B located at both ends in the left-right direction (longitudinal direction) in the front-rear direction, similarly to the inner edge portion 12C of the sealing surface 12 described above. (Short side direction) It is located at both ends and extends along the longitudinal direction, and includes a pair of front and rear straight portions 17A and 17B connecting the pair of left and right semicircular portions 16A and 16B (ends). It has a roughly race track shape in plan view.

The diameters of the pair of left and right semicircular portions 16A and 16B and the distance between the pair of front and rear straight portions 17A and 17B are slightly larger than the diameters (inner diameters) of the ports pC, pS and pE opened in the valve seat surface 82. Although it is made larger, the distance between the pair of left and right half circles 16A and 16B (in the left-right direction) is slightly shorter than the distance between the pair of left and right half circles 13A and 13B (in the left-right direction). The distance between the straight portions 17A and 17B (in the front-rear direction) is slightly shorter than the distance between the pair of front-rear straight portions 14A and 14B (in the front-rear direction), and the opening edge portion 15C of the U-turn continuous passage 15 Is slightly shorter in the left-right direction (longitudinal direction) than the inner edge portion 12C of the sealing surface 12.

Further, in this example, the pair of left and right semicircular portions 16A and 16B located at both ends of the opening edge portion 15C of the U-turn continuous passage 15 are configured with a surface substantially perpendicular to the sealing surface 12.

A tapered surface (also referred to as chamfer) 18 is provided between the inner edge portion 12C of the sealing surface 12 and the opening edge portion 15C of the U-turn communication passage 15. In the illustrated example, the tapered surface 18 is formed as an inclined surface inclined by approximately 45 ° with respect to the sealing surface 12.

In this example, the U-turn continuous passage 15 (internal space) has a substantially equal cross-sectional area (passage cross-sectional area) over the entire length from one end to the other end (excluding the end provided with the tapered surface 18). It is formed to have.

When the valve body 10 takes the right end position, the left semicircular portion 13A at the inner edge portion 12C of the sealing surface 12 and the left semicircular portion 16A at the opening edge portion 15C of the U-turn continuous passage 15 are port pS on the outlet side. Located on the right side (inside) of the peripheral edge, the right semicircular portion 13B at the inner edge portion 12C of the sealing surface 12 and the right semicircular portion 16B at the opening edge portion 15C of the U-turn communication passage 15 are the inlet side port pE. It is located on the left side (inside) of the periphery. Further, when the valve body 10 takes the left end position, the left semicircular portion 13A at the inner edge portion 12C of the sealing surface 12 and the left semicircular portion 16A at the opening edge portion 15C of the U-turn continuous passage 15 are ports on the inlet side. A port located on the right side (inside) of the peripheral edge of the pC, where the right semicircular portion 13B on the inner edge portion 12C of the sealing surface 12 and the right semicircular portion 16B on the opening edge portion 15C of the U-turn communication passage 15 are on the exit side. It is located on the left side (inside) of the periphery of pS. Further, the front and rear straight portions 14A and 14B on the inner edge portion 12C of the sealing surface 12 and the front and rear straight portions 17A and 17B on the opening edge portion 15C of the U-turn continuous passage 15 are the front sides of the three ports pC, pS and pE, respectively. And located on the back side.

In the present embodiment, by adopting the arrangement configuration as described above, when the valve body 10 takes the right end position (first communication state) and the left end position (second communication state), it passes through the U-turn communication passage 15. A part (outer edge portion) of both ports (which become the inlet side flow path and the outlet side flow path) that communicate with each other will be blocked (when viewed in a plan view) (particularly, see FIG. 2). That is, when the valve body 10 takes the right end position, the right end portion of the port pE which is the inlet side flow path of the U-turn continuous passage 15 and the left end portion of the port pS which is the outlet side flow path are closed, and the valve body 10 is closed. When the left end position is taken, the left end portion of the port pC which is the inlet side flow path of the U-turn continuous passage 15 and the right end portion of the port pS which is the exit side flow path are closed.

In the four-way switching valve 1 having such a configuration, as shown in FIGS. 3 and 4, the outlet side flow path differs from the inlet side flow path of the U-turn continuous passage 15 in the pressure balance in the port. At the port of the outlet side flow path and its vicinity, pressure loss occurs on the inside (that is, on the adjacent port side), and the pressure becomes slightly lower than that on the outside (that is, on the side opposite to the adjacent port side), and then. The pressure gradually decreases as it passes through the port. In FIGS. 3 and 4, the direction of the arrow indicates the flow direction, the thickness of the arrow indicates the magnitude of the pressure, the area of the thick line arrow is the high pressure, the area of the thin line arrow is the low pressure, and the intermediate thickness thereof. The area of the arrow means medium pressure.

When the valve body is arranged so as not to block the port as the valve port as in the conventional case, the cross-sectional area (fluid passage area) is basically the same between the outlet side end of the U-turn communication passage and the port. Or, since the port side is slightly smaller, as shown in FIG. 4, the fluid (refrigerant) that has flowed in from the port that is the inlet side flow path and has passed through the U-turn communication passage becomes the outlet side flow path. Immediately after spilling into the port, the pressure begins to drop overall (ie, inside and outside the port). That is, the high voltage on the outside also loses pressure immediately after flowing out into the port that becomes the outlet side flow path, and as a result, it becomes difficult to actually increase the Cv value (flow rate).

On the other hand, as in the present embodiment, at least a part of the port that becomes the outlet side flow path (in this example, the same port pS when the valve body 10 takes the right end position and the left end position) is partly formed by the valve body 10. By closing, as shown in FIG. 3, as shown in FIG. 3, the fluid flows in from the port that becomes the inlet side flow path (in this example, the port pE when the valve body 10 takes the right end position and the port pC when the valve body 10 takes the left end position) and makes a U-turn. The fluid (refrigerant) that has passed through the communication passage 15 can have a small pressure drop (particularly, a pressure drop outside the port pS) even after flowing out into the port pS that is the outlet side flow path. That is, the high pressure on the outside is less likely to cause pressure loss even after flowing out into the port pS which is the outlet side flow path, and as a result, the Cv value (flow rate) can be significantly increased.

FIG. 5 shows the relationship between the blockage rate and the Cv value (relative value) with respect to the full opening of the port pS by the valve body 10 (here, the port diameter (diameter) is φ20 mm). In the present specification, the blockage rate is a ratio or ratio calculated by the following formula (1) (see FIG. 3 for the blockage amount L and the port diameter φD in the formula (1)). In FIG. 5, when the closing rate is a positive value, the inside of the port (periphery) where the opening edge portion 15C (semicircular portions 16A, 16B) of the U-turn communication passage 15 of the valve body 10 is on the exit side. When a part of the port is blocked at the position of, and the blocking rate is a negative value, the opening edge portion 15C (semicircular portion 16A, 16B) of the U-turn communication passage 15 of the valve body 10 is used. Means that is located outside (that is, the perimeter of) the port (that is, the port is unblocked). The Cv value in FIG. 5 is shown (as 100%) based on the Cv value when the blockage rate is −5%.
[Number 1]
Closure rate (%) = (port blockage amount L by valve body) / (port diameter φD) × 100
... (1)

As shown in FIG. 5, the Cv value gradually increases when the blockage rate is about 0 to 5%, reaches the maximum when the blockage rate is about 5%, and gradually decreases when the blockage rate is about 5 to 13%, and the blockage rate gradually decreases. When it exceeds about 13%, it becomes below the standard (100% or less). That is, when the blockage rate is up to about 13% (within about 13%), the pressure loss on the outside is hard to occur (the pressure loss is the smallest at about 5%), and when the blockage rate exceeds about 13%, the pressure loss on the outside is high. It is thought that the loss will increase. Further, when the closing rate is about 9% and the closing rate is 0% (the semicircular portions 16A and 16B located at both ends of the opening edge portion 15C of the U-turn continuous passage 15 are positions corresponding to the peripheral edge of the port. Therefore, it is almost the same as the Cv value (when there is no decrease in the opening area of the port on the exit side).

That is, from FIGS. 3, 4, and 5, until a predetermined blockage condition by the valve body 10, the loss due to the U-turn shape flow by the U-turn communication passage 15 provided in the valve body 10 is the port. It was found that the effect was greater than the loss caused by blocking part of the pS.

As described above, in the four-way switching valve (flow path switching valve) 1 having such a configuration, there is a difference in the pressure balance in the port between the outlet side flow path and the inlet side flow path of the U-turn continuous passage. As can be seen, in and near the port of the outlet side flow path, the inside (that is, the adjacent port side) loses pressure, and the pressure is slightly lower than the outside (that is, the side opposite to the adjacent port side).

In the conventional flow path switching valve as described above, the axial end of the opening edge of the U-turn continuous passage is arranged at a position corresponding to the peripheral edge of the port or outside the peripheral edge of the port, and the port as a valve port. The valve body is arranged so as not to block the U-turn, and the cross-sectional area (fluid passage area) is basically the same between the exit side end of the U-turn passage and the port, or the port side is slightly. Since it is small, the fluid (refrigerant) that has flowed in from the port that is the inlet side flow path and has passed through the U-turn communication passage is totally (that is, inside the port) immediately after flowing out into the port that is the outlet side flow path. The pressure begins to drop (on the outside). That is, it is difficult to actually increase the Cv value (flow rate) because the pressure loss also occurs immediately after the high voltage on the outside flows out into the port which is the outlet side flow path.

In the four-way switching valve (flow path switching valve) 1 of the present embodiment, the axial O-direction ends (semicircular portions 16A and 16B) of the opening edge portion 15C of the U-turn continuous passage 15 are arranged inside the peripheral edge of the port pS. At least a part of the port pS that becomes the outlet side flow path is closed by the valve body 10, and the closing rate of the port pS with respect to the entire opening is, for example, up to 13%, preferably up to 9%, and more preferably up to 5%. Therefore, the fluid (refrigerant) that has flowed in from the port (port pE or port pC) that is the inlet side flow path and has passed through the U-turn continuous passage 15 has flowed out into the port pS that is the outlet side flow path. The pressure drop (particularly the pressure drop outside the port pS) is small. That is, since the high pressure on the outside is less likely to cause pressure loss even after flowing out into the port pS which is the outlet side flow path, the Cv value (flow rate) is significantly increased as compared with the conventional flow path switching valve described above. be able to.

Further, in the four-way switching valve (flow path switching valve) 1 of the present embodiment, it is sufficient to block a part of the port pS with the valve body 10, and it is not necessary to expand or expand the outer diameter of the housing or the piping pitch. , It does not lead to an increase in physique and cost.

In the above-described embodiment, when the valve body 10 takes the right end position or the left end position, a part of both ports of the adjacent ports is blocked by the valve body 10, for example, FIG. As shown in the above-mentioned implementation, even when the valve body 10 blocks only a part of the port pS (the side opposite to the adjacent port side) which is the outlet side flow path among the adjacent ports. It is needless to say in detail that the same action and effect as the morphology can be obtained.

In the above embodiment, the four-way switching valve has been exemplified as the flow path switching valve, but the present invention has a two-way valve for switching the flow path by a valve body (slide valve body), a three-way switching valve, and the like. Of course, it can also be applied to a multi-way switching valve with five or more directions.

Further, in the above embodiment, a slide type valve is exemplified and described, but the present invention can rotate in a cylindrical housing (around a rotation axis parallel to the axis of the housing). Of course, it can also be applied to a rotary type that is arranged and switches the flow path by a valve body (rotary valve body) provided with (one or a plurality of) U-turn communication passages inside.

Further, it goes without saying that the four-way switching valve 1 of the present embodiment can be incorporated not only into a heat pump type air-conditioning system but also into other systems, devices, and devices.

1 Four-way switching valve (flow path switching valve)
8 Four-way pilot valve 9 Main valve 10 Valve body 12 Sealed surface 12C Sealed surface inner edge 13A, 13B Semicircular 14A, 14B Straight line 15 U-turn continuous passage 15C U-turn continuous passage opening edge 16A, 16B Semicircular 17A, 17B Straight part 18 Tapered surface 70 Connecting body 72 Opening 75 Circular opening 80 Housing 81 Valve seat member 82 Valve seat surface 83 Valve chamber 84A, 84B Piston 86A, 86B Actuating chamber 87A, 87B Lid member

Claims (6)

A cylinder-type housing, a valve body movably arranged in the housing in the axial direction, and a valve seat surface in which the valve bodies are brought into contact with each other and a plurality of ports are opened side by side in the axial direction. , Equipped with
The valve body has a U-turn communication passage having a size for communicating adjacent ports among the plurality of ports, and a plurality of communication states for selectively communicating between the ports via the U-turn communication passage. It is a flow switching valve that can be taken.
When the valve body takes a predetermined communication state, the axial end of the opening edge of the U-turn communication passage is the port so as to block at least a part of the port on the exit side of the adjacent ports. It is placed inside the periphery, and the blockage rate for the entire opening of the port is up to 13%.
A flow path switching valve characterized in that only a part of a port on the outlet side of the adjacent ports is blocked by the valve body. The flow path switching valve according to claim 1, wherein the blockage rate is up to 9%. The flow path switching valve according to claim 2, wherein the blockage rate is 5%. The opening edge of the U-turn passage is composed of a pair of semicircular portions located at the end in the axial direction and a pair of straight portions located at the end in the direction perpendicular to the axial direction and extending along the axial direction. The flow path switching valve according to any one of claims 1 to 3, wherein the flow path switching valve is configured. The aspect according to any one of claims 1 to 4, wherein the axial end portion of the opening edge portion of the U-turn continuous passage is formed of a surface perpendicular to the sealing surface that is in sliding contact with the valve seat surface. The flow path switching valve described. It is provided with a cylindrical housing, a valve body movably arranged in the housing, and a valve seat surface to which the valve bodies are opposed to each other and a plurality of ports are opened side by side.
The valve body has a U-turn communication passage having a size for communicating adjacent ports among the plurality of ports, and a plurality of communication states for selectively communicating between the ports via the U-turn communication passage. It is a flow switching valve that can be taken.
When the valve body takes a predetermined communication state, the adjacent ports at the opening edge of the U-turn communication passage are arranged side by side so as to block at least a part of the ports on the exit side of the adjacent ports. The ends are located inside the perimeter of the port and the blockage rate for the full opening of the port is up to 13%.
Only a part of the port on the exit side of the adjacent port is blocked by the valve body.
The flow path switching valve is provided with a rotary valve body rotatably arranged around a rotary axis parallel to the axis of the housing as the valve body.

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