JP2013210050A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform switching operation of a rotary valve, by restraining an increase in driving torque in an intermediate position generated in the switching operation of the rotary valve.SOLUTION: A movable valve element (30) is rotatably moved to a second position where a communicating passage (3a) communicates a high pressure side port (PA) and an indoor heat exchange side port (PD), via an intermediate position where the communicating passage (3a) communicates the high pressure side port (PA), an outdoor heat exchange side port (PC) and the indoor heat exchange side port (PD), and also communicates the outdoor heat exchange side port (PC), the indoor heat exchange side port (PD) and a body space part (11), from a first position where the communicating passage (3a) communicates the high pressure side port (PA) and the outdoor heat exchange side port (PC).

Description

    The present invention relates to a rotary valve in which a movable valve body rotates about an axis, and relates to measures for reducing driving torque for rotating the movable valve body.

    2. Description of the Related Art Conventionally, a rotary valve that switches a communication state of a plurality of connection ports by rotating a movable valve body around an axis is known. Some of these rotary valves are used as a four-way switching valve that reversibly switches the circulation direction of the refrigerant circuit that performs the refrigeration cycle, as disclosed in Patent Document 1.

    This rotary valve includes a valve seat and a movable valve body in a casing. A flat valve seat surface is formed on the valve seat. A plurality of connection ports are opened side by side in the circumferential direction on the valve seat surface. The movable valve body is configured to be rotatable about a rotation axis orthogonal to the valve seat surface. This movable valve body is accommodated in the main body space in the casing. A communication passage is formed in the movable valve body. The communication passage communicates between the openings of the connection ports on the valve seat surface, and moves along the row of the plurality of connection ports as the movable valve body rotates. Thereby, it is comprised so that the communication state between connection ports may switch.

    In the valve seat surface of the rotary valve of Patent Document 1, four connection ports are opened. These connection ports include a high-pressure side port that communicates with the discharge port of the compressor of the refrigerant circuit, a low-pressure side port that communicates with the suction side of the compressor, and a use that communicates with the use-side heat exchanger of the refrigerant circuit. A heat source side port communicating with the side port and the heat source side heat exchanger of the refrigerant circuit.

    When the movable valve body is in the first position, the high pressure side port and the heat source side port communicate with each other through the communication path, and the low pressure side port and the use side port communicate with each other outside the communication path. In this state, the refrigeration cycle is performed with the heat source side heat exchanger serving as a radiator and the use side heat exchanger serving as an evaporator. When the movable valve body moves from the first position to the second position, the high pressure side port and the use side port communicate with each other through the communication path, and the low pressure side port and the heat source side port communicate with each other outside the communication path. To do. In this state, the refrigeration cycle is performed with the heat source side heat exchanger serving as an evaporator and the use side heat exchanger serving as a condenser.

JP 2011-94787 A

    However, in the case of a conventional rotary valve, there is a state in which the movable valve body opens only at the high-pressure side port at an intermediate position between the first position and the second position. In this case, the inside of the communication path becomes a high-pressure state through the high-pressure side port, and the pressure difference between the communication path and the main body space outside the communication path becomes large, which is necessary for rotating the movable valve body. Drive torque increases. As a result, there is a problem that the rotary valve switching operation is not performed smoothly.

    The present invention has been made in view of such a point, and an object of the present invention is to suppress an increase in driving torque when the movable valve body is in an intermediate position, and to smoothly perform a rotary valve switching operation. It is in.

    The first invention includes a valve seat (40) in which three or more connection ports (PA, PB, PC, PD) are opened side by side in the circumferential direction, and the connection ports (PA, PB, PC, PD) A casing (20) in which a main body space portion (11) communicating with the main body space portion is formed, and a communication passage (3a) communicating between the openings of the connection ports (PA, PB, PC, PD) is formed. (11) includes a movable valve body (30), and the communication path (3a) is connected to the plurality of connection ports (PA, PB, PC, It assumes a rotary valve that switches the communication state of a plurality of connection ports (PA, PB, PC, PD) by moving along a line of (PD).

    In the rotary valve, the plurality of connection ports (PA, PB, PC, PD) include a first connection port (PA) in which the communication path (3a) is always open, and the first connection port ( PA) and a pair of second connection ports (PC, PD) on both sides, and the movable valve body (30) has the communication path (3a) connected to the first connection port (PA) and one of the first connection ports (PA). From the first position where the two connection ports (PC) communicate with each other, the communication path (3a) communicates the first connection port (PA) with both the second connection ports (PC, PD) and The connection path (3a) is connected to the first connection port (PA) and the other second connection port via an intermediate position where the two connection ports (PC, PD) communicate with the main body space (11). It is characterized by rotating to a second position communicating with (PD).

    In the first invention, unlike the prior art, when the movable valve body (30) is in the intermediate position, the first connection port (PA) and both the second connection ports (PC, PD) communicate with each other. . Thereby, when the movable valve body (30) moves from one of the first position and the second position to the other through the intermediate position, the communication path (3a) of the movable valve body (30) is connected to the first connection. The state of opening only to the port (PA) disappears.

    In a second aspect based on the first aspect, the valve seat surface (41) is connected to the first connection port (PA) and the second connection when the movable valve element (30) is at an intermediate position. A groove (2a, 2b) extending from the second connection port (PC, PD) to the first connection port (PA) is formed so as to communicate with the port (PC, PD). Yes.

    In the second invention, the groove (2a, 2b) is provided, and the opening area on the valve seat surface (41) side of the second connection port (PC, PD) is connected to the first connection port (PA). I tried to spread it. Thereby, when the said communicating path (3a) is an intermediate position, a 1st connection port (PA) and both 2nd connection ports (PC, PD) come to communicate.

    According to a third aspect of the present invention, in the first or second aspect, the communication path (3a) includes a pair of second connection ports (PC, PD) and the above when the movable valve body (30) is at an intermediate position. It is characterized by being formed so as to open to the first connection port (PA).

    In the third invention, when the movable valve body (30) is at an intermediate position, the communication valve is opened so as to open to a pair of second connection ports (PC, PD) and the first connection port (PA). Widened passage (3a). Thereby, when the said communicating path (3a) is an intermediate position, a 1st connection port (PA) and both 2nd connection ports (PC, PD) come to communicate.

    According to the present invention, when the movable valve body (30) is in the intermediate position, the first connection port (PA) and both the second connection ports (PC, PD) communicate with each other. When (30) moves between the first position and the second position, the state where the communication passage (3a) of the movable valve body (30) opens only to the first connection port (PA) is eliminated.

    When the movable valve body (30) is in the intermediate position, for example, the high-pressure fluid flowing out from the first connection port (PA) passes through the communication path (3a) to the second connection port (PC, PD). Escape and escape from the second connection port (PC, PD) to the main body space (11). As a result, the communication passage (3a) and the main body space (11) are equalized, and a pressure difference is not generated between the communication passage (3a) and the main body space (11). As a result, the increase in drive torque due to the pressure difference between the inside and outside of the communication path (3a) is eliminated, and the switching operation of the rotary valve is performed smoothly.

    According to the second aspect of the invention, the groove (2a, 2b) is provided in the valve seat surface (41), and the valve seat surface (41) side of the second connection port (PC, PD) is provided. When the movable valve body (30) is in the intermediate position without increasing the port diameter of the second connection port (PC, PD) by widening the opening area, the second connection port (PC, PD) can be passed through the communication path (3a). One connection port (PA) can communicate with both second connection ports (PC, PD).

    According to the third aspect of the invention, the communication path (3a) is expanded until it opens to a pair of second connection ports (PC, PD) and the first connection port (PA). Even when the port diameter of the second connection port (PC, PD) is not increased, when the movable valve body (30) is in the intermediate position, the first connection port (PA) is connected to the first connection port (PA) through the communication path (3a). Both second connection ports (PC, PD) can communicate with each other.

Drawing 1 is a longitudinal section showing the rotary valve of an embodiment. 2A and 2B are views showing a first valve seat of the rotary valve, where FIG. 2A is a perspective view and FIG. 2B is a plan view. 3 is a cross-sectional view of the rotary valve taken along line III-III in FIG. 1, (a) is a cross-sectional view when the movable valve body is in the first position, and (b) is a movable valve body in the intermediate position. FIG. 4A and 4B are diagrams schematically showing a switching state of the rotary valve connected to the refrigerant circuit, in which FIG. 4A shows the movable valve body at the first position, and FIG. 4B shows the movable valve body at the intermediate position. The figure shown, (c) is a figure which shows the movable valve body of a 2nd position. FIG. 5 is a graph showing the relationship between the rotational position of the movable valve body and the drive torque. FIG. 6 is a cross-sectional view of a rotary valve according to a modification of the embodiment, where (a) is a cross-sectional view when the movable valve body is in the first position, and (b) is when the movable valve body is in the intermediate position. FIG.

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

    The rotary valve (10) of this embodiment is connected to a refrigerant circuit (75) that circulates a refrigerant (for example, carbon dioxide) that is a fluid and performs a vapor compression refrigeration cycle, and the circulation direction of the refrigerant circuit (75). Is reversibly switched. As shown in FIG. 1, the rotary valve (10) includes a casing (20).

    The casing (20) has a body part (21), a first valve seat (valve seat) (40), and a lid part (22). The body part (21) is formed in a cylindrical shape. The lid part (22) is formed in a disc shape and closes the upper opening of the body part (21). The first valve seat (40) is formed in a disc shape and closes the lower opening of the body portion (21). An electric motor (16) is attached to the upper surface of the lid (22). A first drive shaft (18) connected to the electric motor (16) is inserted through a through hole in the center of the lid (22).

    In the first valve seat (40), as shown in FIGS. 2 (a) and 2 (b), four connection ports (PA, PB, PC, PD) are formed penetrating vertically. These connection ports (PA, PB, PC, PD) open to a flat first valve seat surface (valve seat surface) (41) formed on the upper surface of the first valve seat (40). These opening shapes are all the same circle in plan view. These connection ports (PA, PB, PC, PD) are arranged at intervals of 90 degrees around the axis of the second drive shaft (12) described later. Further, pressure equalizing grooves (2a, 2b) are formed in the first valve seat surface (41). The pressure equalizing grooves (2a, 2b) are a feature of the present invention and will be described in detail later.

    The four connection ports (PA, PB, PC, PD) are the high-pressure side port (first connection port) (PA), the low-pressure side port (PB), and the outdoor heat exchange side port (second connection port) (PC ) And the indoor heat exchange side port (second connection port) (PD). The discharge pipe (15a) of the compressor (70) of the refrigerant circuit (75) is connected to the high pressure side port (PA), and the suction of the compressor (70) of the refrigerant circuit (75) is connected to the low pressure side port (PB). Pipe (15b) is connected, and the outdoor heat exchanger side port (PC) is connected to the gas side pipe (15c) of the outdoor heat exchanger (71) that constitutes the heat source side heat exchanger, and the indoor heat exchanger side port ( PD) is connected to the gas side pipe (15d) of the indoor heat exchanger (72) constituting the use side heat exchanger (see FIG. 4).

    The casing (20) contains a reduction gear (17), a second valve seat (50), a second drive shaft (12), and a movable valve body (30). The lower end of the first drive shaft (18) is connected to the upper part of the reduction gear (17). The upper end of the second drive shaft (12) is connected to the lower part of the reduction gear (17).

    The second valve seat (50) is positioned on the lower side of the reduction gear (17) and is fixed to the body portion (21) so as to face the first valve seat (40). The second valve seat (50) is formed with a through hole at the center thereof, and the second drive shaft (12) is inserted through the through hole.

    A flat second valve seat surface (51) is formed on the lower surface of the second valve seat (50). The first valve seat (40) and the second valve seat (50) are arranged such that the first valve seat surface (41) and the second valve seat surface (51) face each other. A body space (11) is formed between the second valve seat (50) and the first valve seat (40), and the movable valve body (30) is accommodated in the body space (11).

    A second drive shaft (12) extending from the through hole of the second valve seat (50) is fixed to the movable valve body (30). The driving force of the electric motor (16) is transmitted to the reduction gear (17) through the first drive shaft (18), and after being shifted by the reduction gear (17), is then transmitted through the second drive shaft (12). Is transmitted to the movable valve body (30). The movable valve body (30) rotates around the axis of the second drive shaft (12) from the first position to the intermediate position to the second position.

    The movable valve body (30) is formed in a disc shape. The upper surface of the movable valve body (30) faces the second valve seat surface (51), and the lower surface of the movable valve body (30) faces the first valve seat surface (41). Further, as shown in FIG. 3, the movable valve body (30) includes a main valve part (31) that is semicircular in plan view and a sub-valve part (32) that is semicircular in plan view. . The main valve part (31) is formed with a large diameter, and the sub-valve part (32) is formed with a smaller diameter than the main valve part (31). A communication passage (3a) is formed in the main valve portion (31). Further, an auxiliary passage (3b) is formed in the auxiliary valve portion (32).

    The communication passage (3a) opens on the lower surface of the main valve portion (31). The communication path (3a) is formed in a substantially arc shape in plan view. The center of the arc is substantially coincident with the axis of the second drive shaft (12), and the curvature associated with the center line of the arc is substantially the same as the curvature associated with the four connection ports (PA, PB, PC, PD). Match. When the movable valve body (30) is in the intermediate position, the length of the arc related to the communication path (3a) is such that the communication path (3a) is connected to the outdoor heat exchange side port (PC) and the indoor heat exchange side port (PD ) Is set to such a length as to open to the pressure equalizing grooves (2a, 2b). Further, the communication passage (3a) has an arcuate upper half surface on the second valve seat (50) side in the cross section of the communication passage (3a).

    When the movable valve body (30) is in the first position, the high pressure side port (PA) and the outdoor heat exchange side port (PC) communicate with each other through the communication path (3a). When the movable valve body (30) is in the intermediate position, the communication passage (3a) opens to both pressure equalization grooves (2a, 2b), and the high pressure side port (PA) is connected to the outdoor heat exchange side port (PC ) And the indoor heat exchange side port (PD). When the movable valve body (30) is in the second position, the high pressure side port (PA) and the indoor heat exchange side port (PD) communicate with each other through the communication path (3a). Regardless of the rotational position of the movable valve body (30), the high pressure side port (PA) opens into the communication path (3a).

    The auxiliary passage (3b) opens on the lower surface of the sub-valve part (32). The auxiliary passage (3b) is formed in a substantially arc shape in plan view. The center of the arc is substantially coincident with the axis of the second drive shaft (12), and the curvature associated with the center line of the arc is substantially the same as the curvature associated with the four connection ports (PA, PB, PC, PD). Match. The length of the arc related to the auxiliary passage (3b) is formed to be an arc length connecting two adjacent connection ports (PB, PD, PC). Furthermore, the upper half surface of the auxiliary passage (3b) on the second valve seat (50) side is formed in an arc shape in the cross section of the auxiliary passage (3b).

    When the movable valve body (30) is in the first position, the low pressure side port (PB) and the indoor heat exchange side port (PD) communicate with each other through the auxiliary passage (3b). When the movable valve body (30) is in the intermediate position, the auxiliary passage (3b) communicates only with the low pressure side port (PB). When the movable valve element (30) is in the second position, the low pressure side port (PB) and the outdoor heat exchange side port (PC) communicate with each other through the auxiliary passage (3b). Regardless of the rotational position of the movable valve body (30), the low pressure side port (PB) opens to the auxiliary passage (3b).

    The main valve portion (31) is provided with a seal member (60). The seal member (60) is provided on both upper and lower surfaces of the main valve portion (31), and is provided in a recess formed by cutting out a corner portion of the communication passage (3a) in the main valve portion (31). . The seal member (60) is located between the movable valve body (30) and the first valve seat surface (41) and the second valve seat surface (51), and the communication passage (3a) and the main body The space (11) is sealed. Since the high-pressure side port (PA) is always open to the communication passage (3a), during operation of the compressor (70), the communication passage (3a) is approximately equal to the discharge pressure of the compressor (70). The same pressure and high pressure.

    On the other hand, the sub-valve part (32) is not provided with a seal member (60). For this reason, the auxiliary passage (3b) and the main body space (11) are not sealed. Since the low-pressure side port (PB) is always open to the upper auxiliary passage (3b), during operation of the compressor (70), the auxiliary passage (3b) and the body space (11) are compressed. The pressure is the same as the suction pressure of the machine (70) and is in a low pressure state.

    The driving torque of the electric motor (16) is determined by the differential pressure between the communication path (3a) and the main body space (11). When these pressure differences increase, the driving torque increases. When the pressure difference decreases, the driving torque decreases.

    An elastic body (61) is provided between the seal member (60) and the main valve portion (31). The elastic body (61) constitutes a pressing member that presses the seal member (60) against the first valve seat surface (41) and the second valve seat surface (51), and is composed of an O-ring or the like.

    A stopper (14) with which the movable valve body (30) abuts is provided between the first valve seat (40) and the second valve seat (50). The stopper (14) abuts on a step portion between the main valve portion (31) and the sub valve portion (32).

<Equal pressure groove>
As described above, the two pressure equalizing grooves (2a, 2b) are formed in the first valve seat surface (41) of the first valve seat (40) (see FIGS. 2 and 3). One pressure equalizing groove (2a) connects the high-pressure side port (PA) and the outdoor heat exchange side port (PC) when the movable valve body (30) is in an intermediate position (see FIG. 3B). It is formed to communicate. Specifically, it extends in a substantially arc shape from the outdoor heat exchange side port (PC) to the high pressure side port (PA) in plan view. Due to the pressure equalizing groove (2a), the opening area on the first valve seat surface (41) side of the outdoor heat exchange side port (PC) is widened, and the high pressure side port (PA) and the outdoor heat exchange side port (PC) ).

    The other pressure equalizing groove (2b) is formed between the high pressure side port (PA) and the indoor heat exchange side port (PD) when the movable valve body (30) is in the intermediate position (see FIG. 3B). Is formed to communicate with each other. Specifically, it extends in a substantially arc shape from the indoor heat exchange side port (PD) toward the high pressure side port (PA) in plan view. Due to the pressure equalizing groove (2b), the opening area on the first valve seat surface (41) side of the indoor heat exchange side port (PD) is widened, and at the intermediate position, the high pressure side port (PA) and the indoor heat The communication port (PD) communicates.

    Further, these pressure equalizing grooves (2a, 2b) both have a groove depth a (see FIG. 2 (a)) and a groove width b (see FIG. 2 (b)). The groove depth and groove width are the above-mentioned intermediate positions, and the high-pressure gas flowing from the high-pressure side port (PA) into the communication passage (3a) flows into the pressure equalization groove (2a, 2b) and both ports (PC, PD). Through the main body space (11). That is, the opening area on the outlet side of the communication path (3a) is set to be equal to or larger than the opening area on the inlet side. In this embodiment, the opening area on the inlet side is the opening area of the high-pressure side port (PA), and the passage area on the outlet side is the product of the groove depth and groove width of each pressure equalizing groove (2a, 2b) ( It is a value obtained by adding a × b).

-Driving action-
Next, the switching operation of the rotary valve (10) will be described with reference to FIGS. In this rotary valve (10), as the movable valve body (30) rotates, the communication passage (3a) of the movable valve body (30) is arranged in a row of four ports (PA, PB, PC, PD). The communication state between each port (PA, PB, PC, PD) is switched by moving along.

    Specifically, the movable valve body (30) rotates between 0 ° and 90 °. There is a first position between the rotation angle 0 ° and A1, an intermediate position between the rotation angle A1 and A2, and a second position between the rotation angle A2 and 90 °. (See FIG. 5).

    When the rotation angle of the movable valve body (30) is 0 °, the high pressure side port (PA) and the outdoor heat exchange side port (PC) communicate with each other through the communication passage (3a) as shown in FIG. At the same time, the low pressure side port (PB) and the indoor heat exchange side port (PD) communicate with each other through the auxiliary passage (3b). At this time, in the refrigerant circuit (75), the outdoor heat exchanger (71) serves as a condenser, and the indoor heat exchanger (72) serves as an evaporator to perform a refrigeration cycle. At this time, the communication passage (3a) is in a high pressure state, and the auxiliary passage (3b) and the main body space (11) outside the communication passage (3a) are in a low pressure state.

    While the rotation angle of the movable valve body (30) moves from 0 ° to A1, the high pressure side port (PA) and the outdoor heat exchange side port (PC) communicate with each other inside the communication path (3a). Since the high pressure state (3a) is maintained, the driving torque is large as shown in FIG.

    When the rotation angle of the movable valve body (30) exceeds A1, a part of the outdoor heat exchange side port (PC) comes to be located in the main body space (11), and the high-pressure gas in the communication passage (3a) It escapes to the main body space (11) through the pressure equalizing groove (2a) and the outdoor heat exchange side port (PC), and the communication passage (3a) and the main body space (11) are equalized. For this reason, the driving torque is small as shown in FIG.

    When the rotation angle of the movable valve body (30) is 45 °, the high pressure side port (PA) is connected to the outdoor heat exchange side port (PC through the pressure equalizing grooves (2a, 2b) as shown in FIG. 4 (b). ) And the indoor heat exchange side port (PD). As a result, the high-pressure side port (PA) is not closed, and the high-pressure refrigerant flowing from the high-pressure side port (PA) into the communication path (3a) passes through the communication path (3a) to the outdoor heat exchange side port (PC). And it flows out to an indoor heat exchanger side port (PD), and the pressure equalization state of a communicating path (3a) and a body space part (11) is maintained. Also at this time, the drive torque is small as shown in FIG. In this pressure equalization state, the rotation angle of the movable valve body (30) is maintained up to A2.

    When the rotation angle of the movable valve body (30) exceeds A2, the high pressure side port (PA) and the indoor heat exchange side port (PD) communicate with each other inside the communication path (3a), and the communication path again. Since the high pressure state (3a) is maintained, the driving torque increases as shown in FIG. This state is maintained until the rotation angle of the movable valve body (30) reaches 90 °.

-Effect of the embodiment-
According to this embodiment, the high pressure side port (PA) is connected to the outdoor heat exchange side port (PC) through the pressure equalizing grooves (2a, 2b) while the rotation angle of the movable valve body (30) is from A1 to A2. And since it communicates with at least one of the indoor heat exchange side ports (PD), the pressure equalization state between the communication passage (3a) and the main body space (11) is maintained. On the other hand, in the case of the conventional rotary valve, the rotation angle of the movable valve body (30) is around 45 °, the communication path (3a) opens only to the high-pressure side port (PA), and the communication path (3a) is in a high pressure state. As a result, the pressure difference between the inside and outside of the communication path (3a) has increased, and the drive torque has increased.

    As described above, in the present embodiment, unlike the conventional case, the pressure equalization state inside and outside the communication path (3a) is maintained even when the rotation angle of the movable valve body (30) is around 45 °. The increase is eliminated and the switching operation of the rotary valve is performed smoothly.

    Further, according to the present embodiment, the pressure equalizing grooves (2a, 2b) are provided in the first valve seat surface (41), and the outdoor heat exchange side port (PC) and the indoor heat exchange side port (PD) are provided. By expanding the opening area on the valve seat surface (41) side, the movable valve element (30) can be operated without increasing the port diameters of the outdoor heat exchange side port (PC) and the indoor heat exchange side port (PD). When the rotation angle is between A1 and A2, it is possible to communicate with the three ports (PA, PC, PD) through the communication path (3a).

    Further, according to this embodiment, when the length of the pressure equalizing groove (2a, 2b) is extended to the high-pressure side port (PA) side, the length of the communication path (3a) is increased by the extended length. It can be shortened and can communicate with three ports (PA, PC, PD) when the rotation angle of the movable valve body (30) is from A1 to A2. In this way, the length of the communication path (3a) can be shortened, so that the region of high pressure acting on the movable valve body (30) is reduced, and the driving torque of the electric motor (16) can be reduced. .

-Modification of the embodiment-
In the modification of the embodiment shown in FIG. 6, unlike the above-described embodiment, the opening areas of the outdoor heat exchange side port (PC) and the indoor heat exchange side port (PD) are set by the pressure equalizing grooves (2a, 2b). Instead of widening, the three ports (PA, PC, PD) may be communicated by enlarging the size of the seal member (60) in plan view to widen the range of the communication path (3a). Even in this case, the rotary valve can be switched smoothly as in the above embodiment.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

    In the present embodiment, one movable valve element (30) is fixed to the second drive shaft (12). However, the present invention is not limited to this, and two or more movable valves are attached to the second drive shaft (12). The body (30) may be fixed vertically in series. Even in this case, the same effect as in the present embodiment can be obtained.

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

    As described above, the present invention is useful for a rotary valve in which a movable valve body rotates about an axis.

2a, 2b Pressure equalizing groove (groove)
10 Rotary valve
20 casing
30 Movable valve body
40 1st valve seat (valve seat)
50 Second valve seat
PA high-pressure side port (first connection port)
PB Low pressure side port
PC outdoor heat exchange side port (second connection port)
PD Indoor heat exchange side port (second connection port)

Claims (3)

A body space that has a valve seat (40) in which three or more connection ports (PA, PB, PC, PD) open in a circumferential direction and communicates with the connection ports (PA, PB, PC, PD) A communication path (3a) communicating between the casing (20) in which (11) is formed and the opening of the connection port (PA, PB, PC, PD) is formed and accommodated in the main body space (11) A movable valve body (30),
Along with the rotation of the movable valve body (30), the communication path (3a) moves along the row of the plurality of connection ports (PA, PB, PC, PD). , PB, PC, PD)
The plurality of connection ports (PA, PB, PC, PD) include a first connection port (PA) in which the communication path (3a) is always open and a pair on both sides of the first connection port (PA). Second connection port (PC, PD)
The movable valve body (30) has the communication passage (3a) from a first position where the communication passage (3a) communicates the first connection port (PA) with one second connection port (PC). Is an intermediate position where the first connection port (PA) communicates with both second connection ports (PC, PD) and the second connection port (PC, PD) communicates with the main body space (11). A rotary valve characterized in that the communication passage (3a) rotates and moves to a second position through which the first connection port (PA) and the other second connection port (PD) communicate. In claim 1,
The first connecting port (PA) and the second connecting port (PC, PD) are communicated with the valve seat surface (41) when the movable valve body (30) is in an intermediate position. A rotary valve characterized in that grooves (2a, 2b) extending from the second connection port (PC, PD) to the first connection port (PA) are formed. In claim 1 or 2,
The communication path (3a) is formed to open to a pair of second connection ports (PC, PD) and the first connection port (PA) when the movable valve body (30) is at an intermediate position. Rotary valve characterized by being made.

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