JP2004324882A - Control valve, variable displacement compressor and refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve for a variable displacement compressor, having a less number of required ports and a higher degree of freedom in smaller-size design. <P>SOLUTION: A valve chamber is formed in a valve housing. An inlet port and an outlet port for sensible fluid are opened to the valve chamber so that the sensible fluid flows in the valve chamber, Furthermore, a valve port serving as an outlet port for controlled fluid is opened to the valve chamber. In the valve chamber, a valve element and a pressure plate are arranged which is moved to the lifting direction of the valve to change the opening of the valve port and which is displaced in response to the sensible fluid flowing in the valve chamber to move the valve element to the lifting direction of the valve, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control valve, a variable displacement compressor and a refrigeration cycle device, and more particularly to a control valve used as a displacement control valve of a variable displacement compressor, and a vehicle including the variable displacement compressor and the variable displacement compressor. The present invention relates to a refrigeration cycle device used for an air conditioner or the like.

  In a refrigeration cycle device used in an in-vehicle air conditioner or the like, a swash plate type variable displacement compressor is often used as a compressor. The swash plate type variable displacement compressor quantitatively changes the discharge capacity in accordance with the internal pressure (crank chamber pressure) of the crank chamber containing the swash plate. In other words, the swash plate inclination angle decreases as the crankcase pressure increases, and the discharge capacity decreases. Conversely, the swash plate inclination angle increases as the crankcase pressure decreases, increasing the discharge capacity. I do. The control of the discharge capacity can be performed in a feedback compensation manner by detecting the discharge capacity (discharge flow rate) and controlling the crank chamber pressure according to the detected discharge capacity.

  Since the pressure difference at two positions separated by a predetermined amount between the upstream side and the downstream side of the discharge flow path of the variable displacement compressor shows a positive correlation with the pressure loss according to the discharge flow rate, this pressure difference is sensed. There is a differential pressure responsive capacity control valve that performs crank chamber pressure control in accordance with the discharge capacity (for example, Patent Documents 1 and 2).

  The conventional differential pressure responsive capacity control valve is provided with an inlet port, an outlet port, a high pressure side port and a low pressure side port for detecting a differential pressure, each of which is separately provided. Since the pressure chamber for sensing and the valve chamber have different structures, or the member (pressure sensing member) for sensing the differential pressure and the valve body are separate parts, the number of necessary ports and the number of parts are large. There are problems such as a large number of processing steps and difficulty in downsizing.

For this reason, it is not possible to obtain a small-capacity control valve that is inexpensive, has a simplified structure, and has excellent durability. In addition, since the required number of ports is large, the number of pipes connected to each port increases, and in the internal connection with the variable capacity compressor, the number of passages formed in the compressor body increases, and the passage structure of the compressor body is reduced. It gets complicated.
JP 2001-107854 A JP-A-2002-289556

  The present invention has been made in order to solve the above-mentioned problems, and has a small number of required ports, a reduced number of parts, an inexpensive, simplified structure, and a high degree of freedom in downsizing design. It is an object of the present invention to provide a variable displacement compressor in which a control valve for a variable compressor and a passage structure of a compressor body are simplified, and a refrigeration cycle apparatus using the variable displacement compressor.

  In order to achieve the above object, a control valve according to the present invention has a valve chamber formed in a valve housing, and an inlet port and an outlet port of a sensing fluid are opened in the valve chamber so that the sensing fluid flows through the valve chamber. Further, a valve port also serving as an outlet port of the controlled fluid is opened in the valve chamber, and the valve body that changes an opening degree of the valve port by moving in a valve lift direction and flows through the valve chamber into the valve chamber. And a pressure receiving plate that is displaced in response to the sensed fluid flow and moves the valve body in the valve lift direction.

  In the control valve according to the present invention, the valve chamber also serves as a sensing chamber (pressure sensing chamber), and the pressure receiving plate in the valve chamber is displaced in response to the flow of the sensing fluid flowing through the valve chamber. The opening of the valve port changes by this movement, and the flow rate of the controlled fluid is controlled according to the flow rate of the sensing fluid flowing through the valve chamber. In this case, the controlled fluid is the same as the sensing fluid flowing into the valve chamber from the inlet port.

  Further, in the control valve according to the present invention, the pressure receiving plate is configured to be displaced solely by the influence of the dynamic pressure of the sensing fluid flowing through the valve chamber, like the dynamic pressure plate of a dynamic pressure flow meter. Thus, the pressure receiving plate is sensitive to the dynamic pressure and is displaced in accordance with the flow rate of the sensing fluid flowing through the valve chamber.

  In the control valve according to the present invention, the valve body and the pressure receiving plate can be formed as one integral component. Also, the pressure receiving plate is sensitive to dynamic pressure, that is, the pressure receiving plate is greatly affected by the dynamic pressure, the pressure receiving plate is a plurality of sheets stacked at predetermined intervals in the valve lift direction. It is also possible to adopt a multi-plate structure comprising a flat plate, and a through-hole through which the sensing fluid flows is formed at a position adjacent to each of the flat plates and offset from each other around the central axis.

  In the control valve according to the present invention, the valve body is moved in the valve opening direction by the displacement of the pressure receiving plate due to the sensed fluid flow, and further provided with electromagnetic means for urging the valve body in the valve closing direction by electromagnetic force. I have. According to this control valve, the balance value is variably set according to the electromagnetic force generated by the electromagnetic means.

  The electromagnetic means has a plunger chamber having a closed structure for accommodating a plunger, and the pressure of the valve port is introduced into the plunger chamber by an internal passage of the valve body opened toward the valve port. As a result, the pressure on the valve port side acting on the valve body or the pressure in the sensing chamber can be canceled, and the valve body can be displaced by the pressure receiving plate without being affected by these pressures, that is, the flow rate of the sensing fluid. Respond exactly.

  In order to achieve the above object, a control valve according to the present invention has a valve chamber and a sensing chamber formed in a valve housing, and the valve chamber and the sensing chamber communicate with each other through a valve port. An inlet port and an outlet port of the sensing fluid are opened in the sensing chamber so that the sensing fluid flows, and an outlet port of the controlled fluid is opened in the valve chamber, and the valve port is moved into the valve chamber by moving in the valve lift direction. A valve body that changes an opening degree is disposed, and a pressure receiving plate that is displaced in response to a sensing fluid flow flowing through the valve chamber and moves the valve body in a valve lift direction is disposed in the sensing chamber.

  According to the control valve of the present invention, the pressure receiving plate in the sensing chamber is displaced in response to the flow of the sensing fluid flowing through the sensing chamber, and the displacement causes the valve body to move in the valve lift direction. Is changed, and the flow rate of the controlled fluid is controlled according to the flow rate of the sensing fluid flowing through the sensing chamber. Also in this case, the controlled fluid is the same as the sensing fluid flowing into the sensing chamber from the inlet port.

  In the control valve according to the present invention, like the dynamic pressure plate of the dynamic pressure flow meter, the pressure receiving plate is configured to be displaced solely by the influence of the dynamic pressure of the sensing fluid flow flowing through the sensing chamber. Thus, the pressure receiving plate is sensitive to the dynamic pressure and is displaced according to the flow rate of the sensing fluid flowing through the sensing chamber.

  In the control valve according to the present invention, the valve body is moved in the valve opening direction by the displacement of the pressure receiving plate due to the sensed fluid flow, and further provided with electromagnetic means for urging the valve body in the valve closing direction by electromagnetic force. I have. According to this control valve, the balance value is variably set according to the electromagnetic force generated by the electromagnetic means.

  The electromagnetic means has a plunger chamber of a closed structure for accommodating a plunger, and the plunger chamber and the sensing chamber communicate with each other through an equalizing passage, and the pressure of the valve port is introduced into the plunger chamber by the equalizing passage. Is done. As a result, the pressure on the valve port side acting on the valve body or the pressure in the sensing chamber can be canceled, and the valve body can be displaced by the pressure receiving plate without being affected by these pressures, that is, the flow rate of the sensing fluid. Respond exactly.

  The control valve according to the present invention is used as a displacement control valve of a variable displacement compressor that quantitatively changes a discharge capacity in accordance with a crankcase pressure, and an inlet port and an outlet port of the sensing fluid are connected to the variable displacement compressor. And the outlet port of the controlled fluid is connected to the crank chamber.

  According to the control valve of the present invention, the valve chamber or the sensing chamber of the control valve forms a part of the discharge flow path of the variable displacement compressor, and the pressure receiving plate is displaced in response to the discharge fluid flow of the discharge flow path. I do. Accordingly, the valve opening is adjusted by the valve body in accordance with the discharge capacity of the variable displacement compressor, and the flow rate of the discharge fluid introduced into the crank chamber from the outlet port of the controlled fluid is controlled.

  In order to achieve the above object, a variable displacement compressor according to the present invention is a variable displacement compressor that quantitatively changes a discharge capacity according to a crankcase pressure, and is formed in a compressor body. The control valve according to the above-described invention is inserted and mounted in the valve mounting bore, and a discharge fluid inlet passage that guides discharge fluid from a compressor chamber to an inlet port of the sensing fluid in the compressor body; and an outlet port of the sensing fluid. A discharge fluid outlet passage for taking out a discharge fluid, and a crank chamber passage communicating the outlet port of the controlled fluid with the crank chamber are formed.

  According to the variable displacement compressor of the present invention, only three passages of the discharge fluid inlet passage, the discharge fluid outlet passage, and the crank chamber passage need to be provided as the connection passage with the control valve.

  Further, in order to achieve the above object, a refrigeration cycle device according to the present invention has a variable capacity compressor, a condenser, an expansion means, an evaporator, and a refrigerant passage connecting these in a loop, The control valve according to the above-described invention is included as a displacement control valve of the variable displacement compressor.

  In order to achieve the above-mentioned object, a refrigeration cycle apparatus according to the present invention includes a variable displacement compressor according to the above-described invention, a condenser, an expansion unit, an evaporator, and a refrigerant passage for loop-connecting these. Having.

  In the control valve according to the present invention, the pressure receiving plate responds to the dynamic pressure of the sensing fluid flow, particularly the sensing fluid flow flowing through the valve chamber, and is displaced in accordance with the flow rate of the sensing fluid flowing through the valve chamber. Perform accurate flow control according to the requirements. Since the means (pressure receiving plate) for performing flow rate detection (sensing) is provided in the control valve, accurate flow rate control can be performed, and the size of the entire apparatus can be reduced. In other words, the valve chamber that houses the valve body has a structure that also serves as the dynamic pressure sensing chamber that houses the pressure receiving plate, so that compared with the case where another pressure sensing chamber for differential pressure detection or the like is provided. The size can be reduced.

  Also, only three ports, the sensing fluid inlet port, the sensing fluid outlet port, and the valve port (controlled fluid outlet port), are required. This also enables downsizing and reduces the number of piping connected to the control valve. can do.

  And, by using this control valve as a displacement control valve of the variable displacement compressor, it is possible to accurately control the displacement of the compressor.

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

  FIG. 1 shows a first embodiment of a control valve according to the present invention.

  The control valve of the present embodiment is indicated by reference numeral 10 as a whole. The control valve 10 has a valve housing 11. The valve housing 11 has a simple cylindrical shape, the upper end of which is closed by the lower part 31A of the suction element 31 of the electromagnetic coil device 30 which is crimped to the valve housing 11, and the lower end of which is crimped to the valve housing 11 at the lower end. To define the valve chamber 13 between the suction element 31 and the lower lid member 12.

  In the valve housing 11, a sensing fluid inlet port 14 opening in a lower region of the valve chamber 13 and a sensing fluid outlet port 15 opening in an upper region of the valve chamber 13 are formed. The sensing fluid enters the valve chamber 13 from the sensing fluid inlet port 14, the sensing fluid flows from the lower side to the upper side in the valve chamber 13, and the sensing fluid flows out of the valve chamber 13 through the sensing fluid outlet port 15.

  The lower lid member 12 has a projection 16 that protrudes in the axial direction (vertical direction) in the valve chamber 13. A valve port 17 which opens to the valve chamber 13 and also serves as an outlet port for the fluid to be controlled is formed vertically through the projection 16, and the upper surface of the valve seat projection 16 is a valve seat surface 18.

  A valve body 20 is provided in the valve chamber 13 so as to be movable in the axial direction of the valve chamber 13. The valve body 20 integrally has a flange-shaped pressure receiving plate 21 and a valve shaft 22. That is, the valve body 20, the pressure receiving plate 21, and the valve shaft 22 are formed by one component. The valve body 20 faces the valve seat surface 18 and increases or decreases the opening of the valve port 17 by moving in the valve lift direction (vertical direction). The valve shaft 22 is fitted to a valve shaft support guide member 26 that is crimped to the lower end of the suction element 31, and is supported by the valve shaft support guide member 26 so as to be movable in the axial direction.

  The pressure receiving plate 21 has an outer diameter in the valve chamber 13 and has a sufficient gap 23 with the inner peripheral wall of the valve chamber 13. The pressure receiving plate 21 does not obstruct the flow of the sensing fluid flowing through the valve chamber 13, and is exclusively used for the valve chamber 13. 13 is displaced in response to the dynamic pressure of the sensing fluid flow flowing through the sensor 13. That is, the pressure receiving plate 21 forms a dynamic pressure plate of a dynamic pressure flow meter in the valve chamber 13 and receives the dynamic pressure of the sensing fluid flowing through the valve chamber 13 and has a correlation with the flow rate of the sensing fluid flowing through the valve chamber 13. Displaces upward. Note that the size of the gap 23 (cross-sectional area of the flow path) may be set to a size that can ensure the minimum maximum flow rate required for the system.

  The valve body 20 moves in the valve lift direction due to the displacement of the pressure receiving plate 21. Since the pressure receiving plate 21 and the valve body 20 are integral parts, the pressure receiving plate 21 and the valve body 20 move integrally in the valve lift direction. Thereby, the valve element 20 moves in the valve opening direction in accordance with the dynamic pressure acting on the pressure receiving plate 21, that is, the flow rate of the sensing fluid flowing through the valve chamber 13.

  The valve chamber 13 is provided with a setting spring 19 for urging the valve element 20 in the valve opening direction (upward). The setting spring 19 is constituted by a compression coil spring, and is sandwiched between the lower lid member 12 of the valve element 20.

  An electromagnetic coil device 30 serving as an electromagnetic means includes the above-described suction element 31 which is caulked to the upper end of the valve housing 11, a plunger case 33 fixed to an upper part of the suction element 31 and defining a plunger chamber 32 inside, and a plunger. A plunger 34 provided in the chamber 32, a plunger rod (valve rod) 35, a plunger spring 36, a lower outer box 37 attached to a lower portion of the suction element 31, and an outer box fixed to the lower outer box 37 38, a magnetic path guide member 39 attached to the outer box 38 and the plunger case 33, a bobbin 40 and an electromagnetic coil section 41.

  The plunger rod 35 penetrates a center hole 42 formed through the suction element 31 so as to be movable in the axial direction. The plunger rod 35 has an upper end connected to the plunger 34 by a ball 43, and a lower end formed by the ball 44 of the valve shaft 22 of the valve body 20. Connected to the upper end.

  When the electromagnetic coil unit 41 is energized, the electromagnetic coil unit 30 generates an electromagnetic force according to the coil current, and the conical concave magnetic attraction surface (upper surface) 31B of the attracting element 31 has a conical convex shape of the plunger 34. The lower surface 34A is magnetically attracted and urges the valve body 20 via the plunger rod 35 in the valve closing direction (downward).

  The valve body 20, the pressure receiving plate 21, and the valve shaft 22 are formed with internal passages (equalizing passages) 24, 25 that open toward the valve port 17 at lower ends. The internal passages 24 and 25 communicate with the plunger chamber 32 via the valve shaft 22 and a gap 45 between the plunger rod 35 and the center hole 42 of the suction element 31. With this flow path structure, the pressure of the valve port 17 is introduced into the plunger chamber 32. A pressure equalizing hole 46 is formed through the plunger 34. The inner diameter of the valve port 17 and the outer diameter of the plunger rod 35 are set to the same size.

  The control valve 10 having the above-described configuration includes a force in the valve opening direction due to the displacement of the pressure receiving plate 21 in response to the dynamic pressure of the sensing fluid flow flowing through the valve chamber 13 and a spring force in the valve opening direction by the setting spring 19; The position of the valve body 20 in the axial direction is determined by the equilibrium relationship with the force of the electromagnetic coil device 30 in the valve closing direction, and the opening of the valve port 17 is determined. A part of the fluid (sensing fluid) in the valve chamber 13 flows out of the valve port (outlet port) 17 as a controlled fluid with the flow rate measured by the opening degree of the valve port 17.

  The dynamic pressure acting on the pressure receiving plate 21 when the force in the valve closing direction by the electromagnetic coil device 30 is constant. In other words, the opening of the valve port 17 increases in accordance with an increase in the flow rate (capacity) of the sensing fluid flowing from the sensing fluid inlet port 14 to the sensing fluid outlet port 15 in the valve chamber 13, and conversely, The opening of the valve port 17 decreases in accordance with the reduction in the flow rate (capacity) of the sensing fluid. The valve port opening / closing equilibrium value is variably set according to the electromagnetic force generated by the electromagnetic coil device 30.

  As described above, the control valve 10 according to the present embodiment has a structure in which the valve chamber 13 that houses the valve body 20 also serves as a dynamic pressure sensing chamber that houses the pressure receiving plate 21, so that the control valve 10 for detecting a differential pressure or the like can be used. Size can be reduced as compared with the case where another pressure sensing chamber is provided. In addition, the control valve 10 needs only three ports of the sensing fluid inlet port 14, the sensing fluid outlet port 15, and the valve port (controlled fluid outlet port) 17, which also enables downsizing. The number of pipes connected to the valve 10 is reduced. Further, the valve body 20 and the pressure receiving plate 21 are formed as one part, and the number of parts is reduced.

  Further, the pressure of the valve port 17 is introduced into the plunger chamber 32 through the internal passages 24 and 25, and the inner diameter of the valve port 17 and the outer diameter of the plunger rod 35 are the same. The upward force acting on the valve element 20 is canceled by the downward force acting on the plunger rod 35 by the pressure of the valve port 17 introduced into the plunger chamber 32. Thus, the valve body 20 is not affected by the pressure of the valve port 17, and the flow rate control is performed with high accuracy corresponding to the flow rate of the sensed fluid.

  FIG. 2 shows an embodiment of a refrigeration cycle apparatus including the above-described control valve 10 as a displacement control valve of a swash plate type variable displacement compressor.

  This refrigeration cycle is used as an in-vehicle air conditioner or the like mounted on a vehicle such as an automobile, and includes a variable displacement compressor 50, a condenser 91, an expansion means 92, an evaporator 93, And refrigerant passages 94 to 97 for loop connection. The expansion unit 92 includes an expansion valve, a throttle unit, and the like, and performs adiabatic expansion of the refrigerant.

  The variable displacement compressor 50 has a piston 52 whose moving stroke is determined by the inclination angle of the swash plate 51, sucks a fluid such as a refrigerant into a compressor chamber 55 from a suction passage 53 and a suction valve 54, and discharges the fluid from the compressor chamber 55. The fluid is discharged to a valve 56 and a discharge fluid inlet passage (discharge passage) 57. The discharge capacity of the variable displacement compressor 50 increases as the inclination angle of the swash plate 51 increases, and decreases as the inclination angle of the swash plate 51 decreases.

  The swash plate 51 is in the crank chamber 58 and is connected to a rotating shaft 59, and the rotating shaft 59 is driven to rotate by a pulley 60. The swash plate 51 decreases the inclination angle in accordance with the increase in the pressure in the crank chamber 58, that is, the crank chamber pressure Pc, and increases the inclination angle in accordance with the decrease in the crank chamber pressure Pc.

  The suction passage 53 and the discharge fluid inlet passage (discharge passage) 57 are formed in the compressor body 61 as internal passages. In addition, a suction pressure passage 62 for introducing a fixed amount of suction pressure Ps into the crank chamber 58 is formed in the compressor body 61.

  A valve mounting bore 63 is formed in the compressor body 61. The control valve 10 is inserted and mounted in the valve mounting bore 63, and is retained by a stop link 64. In the compressor body 61, the discharge fluid inlet passage 57 for guiding the discharge fluid from the compressor chamber 55 to the sense fluid inlet port 14 of the control valve 10 and the discharge fluid for extracting the discharge fluid from the sense fluid outlet port 15 of the control valve 10. An outlet passage 65 and a crank chamber passage 66 communicating the valve port 17 of the control valve 10, which is an outlet port of the controlled fluid, with the crank chamber 58 are formed as internal passages.

  In the variable displacement compressor 50, the fluid (refrigerant) discharged from the compressor chamber 55 flows from the discharge fluid inlet passage 57 to the sensing fluid inlet port 14 of the control valve 10, and from the sensing fluid inlet port 14 into the valve chamber 13. Inflow. The refrigerant flowing into the valve chamber 13 flows through the valve chamber 13 and flows out of the sensing fluid outlet port 15 to the discharge fluid outlet passage 65. Thereby, the pressure receiving plate 21 of the control valve 10 receives the dynamic pressure of the refrigerant flowing through the valve chamber 13.

  When the discharge amount increases due to an increase in the number of rotations of the compressor, the dynamic pressure acting on the pressure receiving plate 21 increases accordingly, the valve body 20 moves in the valve opening direction, and the opening of the control valve 10 increases. As the opening of the control valve 10 increases, the crank chamber pressure Pc increases, and the inclination angle of the swash plate 51 decreases. Thereby, the discharge amount of the variable displacement compressor 50 is reduced.

  When the discharge amount of the variable displacement compressor 50 decreases, the dynamic pressure acting on the pressure receiving plate 21 decreases accordingly, the valve body 20 moves in the valve closing direction, and the opening of the control valve 10 decreases. As the opening of the control valve 10 decreases, the crank chamber pressure Pc decreases, and the inclination angle of the swash plate 51 increases. As a result, the discharge amount of the variable displacement compressor 50 increases, the dynamic pressure acting on the pressure receiving plate 21 increases, and the opening of the control valve 10 increases, reaching the set opening. This set opening is variably set by the current value of the electromagnetic coil device 30 of the control valve 10. In this way, the discharge amount of the variable displacement compressor 50 is controlled.

  In the variable displacement compressor 50, only three passages of a discharge fluid inlet passage 57, a discharge fluid outlet passage 65, and a crank chamber passage 66 are provided in the compressor body 61 as connection passages with the control valve 10. Therefore, the internal passage configuration of the compressor body 61 is simplified, the manufacturability is excellent, and the degree of freedom in designing the internal passage is high.

  FIG. 3 shows a second embodiment of the control valve according to the present invention. In FIG. 3, the portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted.

  In this embodiment, the pressure receiving plate is composed of a plurality of, for example, three flat plates 21A, 21B, and 21C that are stacked at predetermined intervals in the valve lift direction, and as shown in FIG. Each of the flat plates 21A, 21B, and 21C has a multi-plate structure in which a through hole 27 is formed at a position deviated from each other around the central axis between adjacent ones.

  Of the three flat plates 21A, 21B, and 21C, the flat plate 21A closest to the valve body 21 is formed integrally with the valve body 20, and the remaining two flat plates 21B and 21C are separate components and are assembled to the valve shaft 22. Has become. The flat plates 21B and 21C are prevented from coming off by the retaining ring 28.

  The outer diameter of the flat plates 21A, 21B, 21C is substantially equal to the inner diameter of the valve chamber 13, and does not form a substantial flow path between the outer circumferences of the flat plates 21A, 21B, 21C and the inner circumferential wall of the valve chamber 13.

  Thereby, the sensing fluid flowing into the valve chamber 13 from the sensing fluid inlet port 14 flows through the alternate through holes 27 of the flat plates 21A, 21B, and 21C. As a result, the dynamic pressure of the sensing fluid flowing in the valve chamber 13 effectively acts on the multi-plate pressure receiving plate composed of the flat plates 21A, 21B, and 21C, and the displacement of the pressure receiving plate according to the dynamic pressure is reliably performed. You will be Therefore, the pressure receiving plate sensitively responds to the dynamic pressure, and the flow rate control of the controlled fluid in accordance with the flow rate of the sensed fluid is performed with high accuracy and reliability.

  Note that, similarly to the control valve 10 of the first embodiment, the control valve 10 of the second embodiment can be incorporated in the compressor as a capacity control valve of the swash plate type variable displacement compressor 50. Can be similarly used for a refrigeration cycle apparatus.

  FIG. 5 shows a third embodiment of the control valve according to the present invention.

  The control valve of the present embodiment is indicated by reference numeral 100 as a whole. The control valve 100 has a valve housing 101. A valve shaft supporting guide member 102 is caulked to the upper end of the valve housing 101, and a lower lid member 103 is caulked to the lower end of the valve housing 101.

  The valve housing 101 and the valve shaft support guide member 102 define an upper valve chamber 104, and the lower lid member 103 defines a sensing chamber 105 below. The valve housing 101 is formed with a valve port 106 that connects the valve chamber 104 and the sensing chamber 105 and a controlled fluid outlet port 107 that opens into the valve chamber 104. The lower lid member 103 has a sensing fluid inlet port 108 opening in a lower area of the sensing chamber 105, and the valve housing 101 has a sensing fluid outlet port 109 opening in an upper area of the sensing chamber 105. .

  The sensing fluid enters the sensing chamber 105 from the sensing fluid inlet port 108, flows from the lower side to the upper side in the sensing chamber 105, and flows out of the sensing chamber 105 through the sensing fluid outlet port 109. Some of the sensing fluid flows through the valve port 106 to the valve chamber 104 as a controlled fluid.

  A valve seat surface 110 is formed at an open end of the valve port 106 on the valve chamber 104 side. A valve body 111 is provided in the valve chamber 104 so as to be movable in the axial direction (vertical direction). The valve body 111 faces the valve seat surface 110 and increases or decreases the opening of the valve port 106 by moving in the valve lift direction (vertical direction).

  The valve body 111 has a valve shaft 112 integrally on the upper side and an extension shaft 113 on the lower side. The valve shaft 112 is fitted to the valve shaft support guide member 102, and is supported by the valve shaft support guide member 102 so as to be movable in the axial direction. The extension shaft portion 113 protrudes into the sensing chamber 105 through the valve annulus port 106.

  A pressure receiving plate 114 is disposed in the sensing chamber 105. The pressure receiving plate 114 is urged upward by a setting spring 115 provided in the sensing chamber 105, and is engaged with the distal end of the extension shaft 113 via a ball 116.

  The pressure receiving plate 114 has an outer diameter in the sensing chamber 105 to form a sufficient gap 117 between the sensing chamber 105 and the inner peripheral wall of the sensing chamber 105. The pressure receiving plate 114 does not obstruct the flow of the sensing fluid flowing through the sensing chamber 105, and is exclusively used for the sensing chamber. Displaced in response to the dynamic pressure of the sensing fluid flow flowing through 105. That is, the pressure receiving plate 114 forms a dynamic pressure plate of a dynamic pressure flow meter in the sensing chamber 105 and receives a dynamic pressure of a sensing fluid flow flowing through the sensing chamber 105 and has a correlation with a flow rate of the sensing fluid flowing through the sensing chamber 105. Displaces upward. In addition, the size of the gap 117 (cross-sectional area of the flow path) may be set to a size that can ensure the minimum maximum flow rate required for the system.

  The displacement of the pressure receiving plate 114 causes the valve body 111 to move in the valve lift direction. The valve element 111 moves in the valve opening direction in accordance with the dynamic pressure acting on the pressure receiving plate 114, that is, the flow rate of the sensing fluid flowing through the sensing chamber 105.

  An electromagnetic coil device 130, which is an electromagnetic means, includes a suction element 131 fixed to the upper end of the valve housing 101, a plunger case 133 fixed to an upper part of the suction element 131 and defining a plunger chamber 132 inside, and a plunger chamber 132. , A plunger spring 136, a lower outer box 137 attached to an intermediate portion of the suction element 131, an outer box 138 fixed to the lower outer box 137, an outer box 138 and the plunger case 133. It has a magnetic path guide member 139 attached, a bobbin 140 and an electromagnetic coil part 141.

  The valve shaft 112 passes through a center hole 142 formed through the suction element 131 so as to be movable in the axial direction, and the upper end of the valve shaft 112 is connected to the plunger 134 by a ball 143.

  When the electromagnetic coil device 141 is energized, the electromagnetic coil device 141 generates an electromagnetic force in accordance with the coil current, and the conical convex surface of the plunger 134 is formed on the conical concave magnetic attraction surface (upper surface) 131A of the suction element 131. The lower surface 134A is magnetically attracted, and urges the valve body 111 via the valve shaft 112 in the valve closing direction (downward).

  A pressure equalizing passage 118 that opens into the sensing chamber 105 is formed in the valve housing 101. The pressure equalizing passage 118 communicates with the plunger chamber 132 through a gap 145 between the valve shaft 112 and the center hole 142 of the suction element 131. With this flow path structure, the pressure of the sensing chamber 105 is introduced into the plunger chamber 132. Note that a pressure equalizing hole 146 is formed through the plunger 134. Further, the inner diameter of the valve port 106 and the outer diameter of the valve shaft 112 are set to the same size.

  The control valve 100 having the above-described configuration includes a force in the valve opening direction due to the displacement of the pressure receiving plate 114 in response to the dynamic pressure of the sensing fluid flow flowing through the sensing chamber 105 and a spring force in the valve opening direction by the setting spring 115; The axial position of the valve body 111 is determined by the equilibrium relationship with the force in the valve closing direction by the electromagnetic coil device 130, and the opening of the valve port 106 is determined. With the flow rate measured by the opening degree of the valve port 106, a part of the fluid (sensing fluid) in the sensing chamber 105 flows out of the controlled fluid outlet port 107 as a controlled fluid.

  When the force in the valve closing direction by the electromagnetic coil device 130 is constant, the dynamic pressure acting on the pressure receiving plate 114, in other words, the flow of the sensing fluid flowing from the sensing fluid inlet port 108 to the sensing fluid outlet port 109 in the sensing chamber 105 is detected. The opening of the valve port 106 increases with an increase in the flow rate (volume), and conversely, the opening of the valve port 106 decreases with a decrease in the flow rate (volume) of the sensing fluid. Then, an equilibrium value for opening and closing the valve port is variably set according to the electromagnetic force generated by the electromagnetic coil device 130.

  As described above, the control valve 100 according to the present embodiment requires only the three ports of the sensing fluid inlet port 108, the sensing fluid outlet port 109, and the controlled fluid outlet port 107, which enables downsizing. Thus, the number of pipes connected to the control valve 100 is reduced.

  In addition, the pressure in the sensing chamber 105 is introduced into the plunger chamber 132 by the equalizing passage 118 and the like, and the inner diameter of the valve port 106 and the outer diameter of the valve shaft 112 are the same. The upward force acting on the valve body 111 is offset by the downward force acting on the valve shaft 112 by the pressure of the sensing chamber 105 introduced into the plunger chamber 132. Thus, the valve body 111 is not affected by the pressure of the sensing chamber 105, and the flow rate is controlled with high accuracy corresponding to the sensing fluid flow rate.

  FIG. 6 shows an embodiment of a refrigeration cycle apparatus including the above-described control valve 100 as a capacity control valve of a swash plate type variable capacity compressor. In FIG. 6, portions corresponding to those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and description thereof is omitted.

  The control valve 100 is inserted and mounted in the valve mounting bore 63 of the compressor body 61, and is retained by a stop link 64. In the compressor body 61, a discharge fluid inlet passage 57 that guides discharge fluid from the compressor chamber 55 to the sensing fluid inlet port 108 of the control valve 100, and a discharge fluid outlet passage that extracts discharge fluid from the sensing fluid outlet port 109 of the control valve 100. 65 and a crank chamber passage 66 communicating the controlled fluid outlet port 107 of the control valve 100 and the crank chamber 58 are formed as internal passages.

  In the variable displacement compressor 50, the fluid (refrigerant) discharged from the compressor chamber 55 flows from the discharge fluid inlet passage 57 to the sensing fluid inlet port 108 of the control valve 100, and enters the sensing chamber 105 from the sensing fluid inlet port 108. Inflow. The refrigerant flowing into the sensing chamber 105 flows through the sensing chamber 105 and flows out of the sensing fluid outlet port 109 to the discharge fluid outlet passage 65. Thereby, the pressure receiving plate 114 of the control valve 100 receives the dynamic pressure of the refrigerant flowing through the sensing chamber 105.

  When the discharge amount increases due to an increase in the number of rotations of the compressor, the dynamic pressure acting on the pressure receiving plate 114 increases accordingly, the valve body 111 moves in the valve opening direction, and the opening of the control valve 100 increases. As the opening of the control valve 100 increases, the crank chamber pressure Pc increases, and the inclination angle of the swash plate 51 decreases. Thereby, the discharge amount of the variable displacement compressor 50 is reduced.

  When the discharge amount of the variable displacement compressor 50 decreases, the dynamic pressure acting on the pressure receiving plate 114 decreases accordingly, the valve body 111 moves in the valve closing direction, and the opening of the control valve 100 decreases. As the opening of the control valve 100 decreases, the crank chamber pressure Pc decreases, and the inclination angle of the swash plate 51 increases. As a result, the discharge amount of the variable displacement compressor 50 increases, the dynamic pressure acting on the pressure receiving plate 114 increases, and the opening of the control valve 100 increases, reaching the set opening. This set opening is variably set by the current value of the electromagnetic coil device 130 of the control valve 100. In this way, the discharge amount of the variable displacement compressor 50 is controlled.

  Also in the variable displacement compressor 50, as a connection flow path with the control valve 100, only three passages of the discharge fluid inlet passage 57, the discharge fluid outlet passage 65, and the crank chamber passage 66 are provided in the compressor body 61. Therefore, the internal passage configuration of the compressor body 61 is simplified, the manufacturability is excellent, and the degree of freedom in designing the internal passage is high.

It is a longitudinal section showing Embodiment 1 of a control valve by this invention. FIG. 1 is a diagram showing one embodiment of a refrigeration cycle apparatus including a control valve according to Embodiment 1 as a capacity control valve of a swash plate type variable displacement compressor. It is a longitudinal cross-sectional view which shows Embodiment 2 of the control valve by this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a longitudinal cross-sectional view which shows Embodiment 3 of the control valve by this invention. It is a figure showing one embodiment of a refrigerating cycle device which includes a control valve by Embodiment 3 as a capacity control valve of a swash plate type variable capacity compressor.

Explanation of reference numerals

Reference Signs List 10 control valve 11 valve housing 13 valve chamber 14 sensing fluid inlet port 15 sensing fluid outlet port 17 valve port 20 valve body 21, 21A, 21B, 21C pressure receiving plate 22 valve shaft 24, 25 internal passageway 30 electromagnetic coil device 31 attraction element 32 Plunger chamber 34 Plunger 35 Plunger rod 50 Variable capacity compressor 51 Swash plate 52 Piston 53 Suction passage 55 Compressor chamber 57 Discharge fluid inlet passage 58 Crank chamber 65 Discharge fluid outlet passage 66 Crank chamber passage 91 Condenser 92 Expansion means 93 Evaporator 94 to 97 refrigerant passage 100 control valve 101 valve housing 104 valve chamber 105 sensing chamber 106 valve port 107 controlled fluid outlet port 108 sensing fluid inlet port 109 sensing fluid outlet port 111 valve body 114 pressure receiving plate 118 equalizing passage 130 electromagnetic Coil device 131 Suction element 132 Plunger chamber 134 Plunger

Claims (14)

A valve chamber is formed in the valve housing, an inlet port and an outlet port of the sensing fluid are opened in the valve chamber so that the sensing fluid flows in the valve chamber, and the valve chamber also serves as an outlet port of the controlled fluid. The port opens,
A valve body that changes the degree of opening of the valve port in the valve chamber by moving in a valve lift direction, and a pressure receiving plate that displaces in response to a sensing fluid flow flowing through the valve chamber and moves the valve body in the valve lift direction. And are arranged,
A control valve, characterized in that:   The control valve according to claim 1, wherein the pressure receiving plate is configured to be displaced under the influence of a dynamic pressure of a sensing fluid flowing through the valve chamber.   The control valve according to claim 1, wherein the valve body and the pressure receiving plate are formed as a single unit.   The pressure receiving plate is composed of a plurality of flat plates stacked at predetermined intervals in the valve lift direction, and the sensing fluid flows at positions adjacent to each of the flat plates and offset from each other around the central axis. The control valve according to claim 1, wherein a through hole is formed.   2. The valve body according to claim 1, wherein the valve body is moved in a valve opening direction by displacement of the pressure receiving plate due to a sensed fluid flow, and electromagnetic means is provided for urging the valve body in a valve closing direction by an electromagnetic force. The control valve according to any one of claims 1 to 4.   The electromagnetic means has a plunger chamber of a closed structure for accommodating a plunger, and the pressure of the valve port is introduced into the plunger chamber by an internal passage of the valve body opened toward the valve port. The control valve according to claim 5, wherein A valve chamber and a sensing chamber are formed in the valve housing, the valve chamber and the sensing chamber communicate with each other through a valve port, and an inlet port and an outlet port of the sensing fluid in the sensing chamber so that the sensing fluid flows through the sensing chamber. Is opened, an outlet port of the controlled fluid is opened in the valve chamber,
A valve body that changes the opening degree of the valve port by moving in the valve lift direction is disposed in the valve chamber, and is displaced in the sensing chamber in response to a sensing fluid flow flowing through the sensing chamber to move the valve body in the valve lift direction. A pressure receiving plate to be moved to
A control valve, characterized in that:   8. The control valve according to claim 7, wherein the pressure receiving plate is configured to be displaced under the influence of a dynamic pressure of a sensing fluid flowing through the sensing chamber.   8. The electromagnetic valve according to claim 7, wherein the valve body is moved in a valve opening direction by displacement of the pressure receiving plate due to a sensed fluid flow, and electromagnetic means is provided for urging the valve body in a valve closing direction by an electromagnetic force. Or the control valve according to 8.   10. The control valve according to claim 9, wherein the electromagnetic means has a plunger chamber having a closed structure for accommodating the plunger, and the plunger chamber and the sensing chamber communicate with each other through a pressure equalizing passage. Used as a displacement control valve of a variable displacement compressor that quantitatively changes the displacement according to the crankcase pressure,
The inlet port and the outlet port of the sensing fluid are connected to a discharge flow path of the variable displacement compressor, and the outlet port of the controlled fluid is connected to the crank chamber. The control valve according to claim 1. A variable displacement compressor that quantitatively changes a discharge capacity according to a crank chamber pressure,
The control valve according to claim 11 is inserted and mounted in a valve mounting bore formed in the compressor body, and a discharge fluid inlet passage for guiding discharge fluid from a compressor chamber to an inlet port of the sensing fluid in the compressor body. A displacement fluid outlet passage for taking out a discharge fluid from an outlet port of the sensing fluid; and a crank chamber passage communicating the outlet port of the controlled fluid with the crank chamber. Machine. Having a variable displacement compressor, a condenser, an expansion means, an evaporator, and a refrigerant passage for loop-connecting these,
A refrigeration cycle apparatus including the control valve according to claim 11.   13. A refrigeration cycle apparatus comprising the variable displacement compressor according to claim 12, a condenser, expansion means, an evaporator, and a refrigerant passage connecting these with a loop.

Images