JP4925800B2 - Control valve for variable displacement compressor - Google Patents

Description

  The present invention relates to a control valve for a variable displacement compressor.

  Conventionally, as a control valve for a variable capacity compressor used in a refrigeration cycle such as an automotive air conditioner, a high pressure valve portion provided in the middle of an introduction side communication path that connects a discharge flow path of the variable capacity compressor and a control pressure chamber; A low-pressure valve portion provided in the middle of the discharge side communication passage that communicates the suction flow path and the control pressure chamber, and variably controls the communication opening degree of the high-pressure valve portion and the low-pressure valve portion. It is known to change the angle of the swash plate by changing the pressure of the chamber.

In such a configuration, the case chamber (crank chamber) is often used as the control pressure chamber. In this case, when the control pressure (control pressure chamber pressure) is increased, the swash plate angle is decreased and the discharge capacity is decreased. If the value is lowered, the swash plate angle increases and the discharge capacity increases (for example, Patent Document 1).
International Publication No. WO 2004/065789

  However, in the control valve disclosed in Patent Document 1, since the discharge pressure acts in the direction of closing the valve body in the ball valve as the high pressure valve portion, the control is performed to reduce the discharge capacity by reducing the swash plate angle. In such a case, the discharge pressure may cause the high pressure valve portion to close unintentionally, the control pressure may decrease, the swash plate angle may increase, and the discharge capacity may increase.

  In addition to the above-described ball valve as the high-pressure valve portion, there is a conventional one in which the valve body of the low-pressure valve portion is integrated with the spool valve as the high-pressure valve portion. As a result, there is a problem that the start-up is delayed at the start of cooling due to the occurrence of leakage in the clearance between the sleeve and the spool.

  Accordingly, the present invention provides a control valve for a variable displacement compressor that can prevent the high-pressure valve portion from closing unintentionally due to an increase in discharge pressure and increase the swash plate angle, and further improve the startability. The purpose is to obtain.

  In the first aspect of the invention, the high-pressure valve portion provided in the middle of the introduction side communication path (6) communicating the discharge flow path (4) of the variable capacity compressor (2) and the control pressure chamber (3). (7) and a low pressure valve section (9) provided in the middle of the discharge side communication path (8) communicating the suction flow path (5) and the control pressure chamber (3). (7) and a control valve for a variable displacement compressor that changes the angle of the swash plate (2a) by changing the pressure of the control pressure chamber (3) by variably controlling the communication opening of the low pressure valve section (9). Position control means (10) for controlling the advancing / retreating position of the high pressure side valve body (7a) of the high pressure valve section (7) and the low pressure side valve body (9a) of the low pressure valve section (9); As the high pressure side valve element (7a) is arranged on one side by (10), the communication opening degree of the high pressure valve part (7) is expanded. Both are configured such that the pressure on the discharge flow path (4) side acting on the high pressure side valve element (7a) is reduced, and the low pressure side valve element (9a) is moved to the other side by the position control means (10). The communication opening degree of the low-pressure valve part (9) is increased as it is arranged in the position, and the high-pressure valve body (9a) is arranged on the other side by the position control means (10). The side valve body (7a) and the low pressure side valve body (9a) are configured to be separated.

  In the invention of claim 2, when the high pressure side valve element (7a) and the low pressure side valve element (9a) are arranged on one side by the position control means (10), the low pressure valve part (9) is provided. Further, it is configured to be fully closed.

  In the invention of claim 3, the urging means (16) for urging only the low pressure side valve element (9a) of the high pressure side valve element (7a) and the low pressure side valve element (9a) to the other side. It is characterized by providing.

  According to the first aspect of the present invention, since the pressure on the discharge flow path side acting on the high pressure side valve element is reduced, when the high pressure valve portion is in the open state, It is possible to suppress the pressure of the control pressure chamber from being lowered due to the high pressure valve portion being closed due to the pressure on the discharge flow channel side that has acted. Therefore, in a state where the swash plate angle of the variable capacity compressor is small, the communication opening of the high-pressure valve part is unintentionally narrowed or closed, and the pressure in the control pressure chamber is lowered and the swash plate angle is increased. Can be suppressed.

  And when the low pressure side valve element is arranged on the other side by the position control means, the high pressure side valve element is separated from the low pressure side valve element, so that the low pressure side valve element is not restricted by the high pressure side valve element. The communication opening degree of the low pressure valve part can be expanded. Therefore, when starting the variable displacement compressor, the communication opening of the low-pressure valve section is expanded more quickly to reduce the pressure in the control chamber pressure, and the swash plate angle is increased to ensure the required discharge capacity. It becomes easy.

  Furthermore, since the restriction on the operation of the low pressure side valve element by the high pressure valve portion is reduced, the leak flow rate when the low pressure valve portion is closed can be reduced.

  Further, according to the first aspect of the present invention, the high pressure valve portion and the low pressure valve portion are configured to be separable from each other, and therefore the pressure on the discharge flow path side acts on one side of the high pressure side valve element. However, since the low-pressure side valve element can be operated separately from the high-pressure side valve element, the communication opening degree of the low-pressure valve part can be increased more quickly, and the switching responsiveness can be improved. Become.

  According to the invention of claim 2, since the low pressure valve portion is fully closed when the high pressure side valve body and the low pressure side valve body are arranged on one side by the position control means, the pressure of the control pressure chamber Can be easily maintained in a high pressure state, and energy loss can be reduced by the amount that the leakage flow rate in the low pressure valve portion can be reduced.

  Further, when the low-pressure valve portion is configured to be closed, it is difficult to ensure the communication opening degree in the low-pressure valve portion as compared with the case where the low-pressure valve portion is not closed. Since the side valve body and the low pressure side valve body are separated, the communication opening degree in the low pressure valve section can be expanded more quickly, and the low pressure valve section is closed, that is, the pressure in the control pressure chamber is high. Switching from the state to the state in which the low pressure valve portion is open, that is, the state in which the pressure in the control pressure chamber is low, can be performed more quickly, and the control response can be improved.

  According to the invention of claim 3, since the high pressure side valve body and the low pressure side valve body can be more quickly separated by the urging means, the communication opening degree of the low pressure valve portion can be expanded more quickly. Control responsiveness can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of the device configuration of a variable displacement compressor and a control valve according to the present embodiment, and FIG. 2 is a longitudinal sectional view (a sectional view including a central axis) of the control valve, with a high-pressure valve portion closed. FIG. 3 is an enlarged view of part A in FIG. 2, FIG. 4 is an enlarged view of part B in FIG. 2, and FIG. 5 is a longitudinal sectional view of the control valve. FIG. 6 shows a state in which the high pressure valve portion is open and the low pressure valve portion is closed, and FIG. 6 shows a correlation between the position of the movable portion in the control valve and the opening areas of the high pressure valve portion and the low pressure valve portion. It is a graph.

  As shown in FIG. 1, the control valve 1 according to the present embodiment controls a control pressure Pc that changes the inclination angle of the swash plate 2 a in order to change the discharge capacity of the variable capacity compressor 2. Controls the pressure (control pressure) Pc in the case chamber 3 as a control pressure chamber. In this case, the lower the pressure Pc in the case chamber 3 is, the larger the pressure difference acting on the piston in the variable capacity compressor 2 is and the discharge capacity is increased. Conversely, the higher the pressure in the case chamber 3 is, the higher the discharge capacity is. Will be reduced.

  The control pressure Pc is generated as an intermediate pressure between the medium pressure (discharge pressure) Pd in the discharge flow path 4 (for example, the discharge port) and the medium pressure (suction pressure) Ps in the suction flow path 5 (for example, the intake port). The For this purpose, the control valve 1 is provided in the middle of the introduction-side communication path 6 that connects the discharge flow path 4 and the case chamber 3, and the suction flow path 5 is variably controlled. Is provided in the middle of the discharge side communication passage 8 that communicates with the case chamber 3, and a low pressure valve portion 9 that variably controls the communication opening degree. By adjusting the communication opening degree, the control pressure Pc is adjusted. It is designed to generate. In the case of such a configuration, the control pressure Pc approaches the discharge pressure Pd and becomes higher as the communication opening degree in the high-pressure valve section 7 is larger, while the control pressure Pc becomes the suction pressure Ps as the communication opening degree in the low-pressure valve section 9 is larger. It approaches and becomes low pressure. Further, by controlling both the communication opening degree of the high pressure valve section 7 and the communication opening degree of the low pressure valve section 9, the medium flow from the discharge flow path 4 to the suction flow path 5 is suppressed as much as possible to reduce energy loss. However, the control pressure Pc can be generated.

  In the present embodiment, the medium circulation path (including the introduction side communication path 6 and the discharge side communication path 8) used to generate the control pressure Pc is also used as the medium circulation path in the case chamber 3. Useful for lubrication and cooling of sliding parts. For this reason, the opening 6a of the introduction-side communication path 6 facing the case chamber 3 and the opening 8a of the discharge-side communication path 8 are arranged so as to be appropriately separated from each other, and reach from the high-pressure valve section 7 to the low-pressure valve section 9. The medium path up to is also somewhat longer. Therefore, the pressure Pc1 on the case chamber 3 side in the high pressure valve portion 7 is slightly higher than the pressure Pc2 on the case chamber 3 side in the low pressure valve portion 9.

  As shown in FIG. 2, the control valve 1 includes a solenoid 10 in which a solenoid as a position control means is built, and a valve portion 11 in which a high pressure valve portion 7 and a low pressure valve portion 9 are built.

  In the valve section 11, the valve body of the high pressure valve section 7 (high pressure side valve body 7a) and the valve body of the low pressure valve section 9 (low pressure side valve body 9a) are arranged in tandem in the advancing and retreating direction of the solenoid movable section 10a. The high pressure side valve element 7a and the low pressure side valve element are pressed against the movable part 10a by the coil springs 14 and 16 as urging means, and the movable part 10a is moved back and forth. The position of 9a can be varied, and the communication opening degree of both the high pressure valve part 7 and the low pressure valve part 9 can be controlled. In the present embodiment, the low pressure side valve body 9a is disposed on the side close to the movable portion 10a, and the high pressure side valve body 7a is disposed on the far side. In the following description, for the sake of convenience, the direction indicated by the arrow X in FIGS. 2 to 5 is referred to as the distal end side, and the opposite side is referred to as the proximal end side. The movable portion 10a, the low-pressure side valve body 9a, and the high-pressure side valve body 7a advance and retreat along the X direction. The X direction is along the axial direction of the sleeve 12, the spool 13, and the movable portion 10a of the solenoid.

  The valve portion 11 includes a substantially cylindrical sleeve 12 in which a through hole 12a having a circular cross section is formed in the longitudinal direction. A spool 13 is inserted into the through hole 12a with an appropriate clearance. It is possible to advance and retreat along the longitudinal direction.

  A high pressure valve portion 7 is formed on the distal end side of the valve portion 11. Here, a specific configuration of the high-pressure valve unit 7 will be described with reference to FIGS. 2 and 3.

  A bottomed cylindrical concave portion 12b having a diameter larger than that of the through hole 12a is formed on the distal end side of the through hole 12a of the sleeve 12, and the opening 12e side of the concave portion 12b is closed by a lid 12d.

  On the other hand, an umbrella-shaped poppet 13a is formed at the tip of the spool 13 so as to protrude slightly outward from the through hole 12a. The poppet 13a is accommodated in the recess 12b. 2 and 3, the bottom surface 13b of the poppet 13a and the bottom surface 12c of the recess 12b are in contact with each other. In the present embodiment, the poppet 13a corresponds to the high-pressure side valve body 7a of the high-pressure valve portion 7, and the bottom surface 12c of the recess 12b corresponds to the seal surface (seat surface).

  Here, a coil spring 14 as an urging means is interposed between the lid body 12d and the poppet 13a, and the poppet 13a is inserted into the X direction base end side, that is, the high-pressure side valve body 7a by the coil spring 14. Is energized in the valve closing direction.

  Further, the sleeve 12 is formed with a lateral hole port 12f orthogonal to the through hole 12a at a position spaced a predetermined distance from the opening 12e on the distal end side of the through hole 12a toward the proximal end in the X direction. Is formed with a small-diameter portion 13c having a substantially constant circular cross section that is narrowly wound from the bottom surface 13b of the poppet 13a to a position facing the side hole port 12f.

  2 and 3, the case chamber 3 side of the introduction side communication passage 6 (not shown) is communicated with the recess 12b through a through hole 12g formed in the lid 12d, while the discharge of the introduction side communication passage 6 is performed. The flow path 4 side communicates with the side hole port 12f. Therefore, the pressure in the recess 12b, that is, the back pressure of the poppet 13a becomes the control pressure (Pc1), and the pressure in the gap 12h corresponding to the side hole port 12f and the narrow diameter portion 13c of the spool 13 becomes the discharge pressure Pd.

  Here, the discharge pressure Pd acts on the end surface on the X direction front end side of the small diameter portion 13c of the spool 13 and the discharge pressure Pd acts on the end surface on the X direction base end side of the small diameter portion 13c of the spool 13. The pressure Pd acts on the tip end side in the X direction. Accordingly, the discharge pressure Pd acting on the spool 13 is reduced (offset) in the axial direction of the spool 13.

  With the above configuration, when the spool 13 moves to the tip end side in the X direction and the poppet 13a as the high-pressure side valve body 7a is separated from the bottom surface 12c as the seating surface, the high-pressure valve portion 7 is in an open state and is introduced. 6 will communicate. The communication opening degree by this high-pressure valve part 7 will expand according to the separation distance from the bottom face 12c of the poppet 13a. On the other hand, the state in which the spool 13 is positioned on the most proximal side in the X direction and the poppet 13a is seated on the bottom surface 12c corresponds to the state in which the high pressure valve portion 7 is closed, and in this state, the introduction side communication path 6 is blocked. It has come to be. In such a configuration, the sealing performance in the high-pressure valve unit 7 can be improved by making the poppet 13a fit into the bottom surface 12c. Then, the position of the poppet 13a in the X direction, that is, the communication opening degree of the high-pressure valve unit 7 is controlled by a solenoid as a position control means described later.

  A low pressure valve portion 9 is formed on the proximal end side of the valve portion 11. Here, a specific configuration of the low-pressure valve unit 9 will be described with reference to FIGS. 2, 4, and 5.

  The sleeve 12 is formed with another lateral hole port 12i orthogonal to the through hole 12a at a position spaced apart from the lateral hole port 12f by a predetermined distance on the X direction base end side, while the spool 13 includes the lateral hole port 12i and A small-diameter portion 13d having a substantially constant circular cross section that is narrowly wound from an opposing position to an end portion on the base end side is formed.

  Note that the clearance between the through hole 12a and the section (general portion 13e) existing between the horizontal hole port 12f and the horizontal hole port 12i in the spool 13 is narrowed, and the medium leakage between the horizontal hole ports 12f and 12i is reduced. It is like that.

  Further, a bottomed cylindrical recess 12j having a diameter larger than that of the through hole 12a is formed on the proximal end side of the through hole 12a of the sleeve 12. The distal end side of the side wall 12k of the concave portion 12j is press-fitted into a concave groove 10b provided on the distal end side of the solenoid 10, whereby the valve portion 11 and the solenoid 10 are coupled.

  And the poppet 15 as the low-pressure side valve body 9a is arrange | positioned in the recessed part 12j. The poppet 15 is formed with a substantially cylindrical concave portion 15a, and a small diameter portion 13d of the spool 13 is loosely inserted into the concave portion 15a.

  An annular protrusion 15b is provided on the tip end side of the poppet 15 in the X direction. As shown in FIG. 5, when the poppet 15 is positioned on the most tip end side in the X direction, the protrusion 15b is formed in the through hole 12a. The base end side opening 12m is inserted into the through-hole 12a, and the top surface 15c around the protrusion 15b and the bottom surface 12n of the recess 12j come into contact with each other. As described above, in this embodiment, the poppet 15 corresponds to the low pressure side valve body 9a of the low pressure valve portion 9, and the bottom surface 12n of the recess 12j corresponds to the seal surface (seat surface).

  Further, a coil spring 16 as an urging means is interposed between the bottom surface 12n and the poppet 15, and the poppet 15 is opened by the coil spring 16 in the X direction base end side, that is, the low pressure side valve body 9a. Energized in the valve direction.

  2, 4 and 5, the case chamber 3 side of the discharge side communication passage 8 (not shown) is communicated with the lateral hole port 12i, while the suction flow path 5 side of the discharge side communication passage 8 is formed on the side wall 12k. The through hole 12o communicates with the recess 12j. Therefore, the pressure in the recess 12j, that is, the back pressure of the poppet 15 becomes the suction pressure Ps, and the pressure of the side hole port 12i becomes the control pressure (Pc2).

  That is, in this embodiment, when the spool 13 moves to the base end side in the X direction and the poppet 15 as the low pressure side valve body 9a is separated from the bottom surface 12n as the seating surface, the low pressure valve portion 9 is opened. The discharge side communication path 8 communicates. The communication opening degree by the low-pressure valve portion 9 increases according to the distance from the bottom surface 12 n of the poppet 15. On the other hand, the state in which the spool 13 is positioned on the most distal end side in the X direction and the poppet 15 is seated on the bottom surface 12n corresponds to the state in which the low pressure valve portion 9 is closed, and in this state, the discharge side communication passage 8 is blocked. It has become so. In such a configuration, the sealing performance in the low-pressure valve portion 9 can be improved by making the poppet 15 conform to the bottom surface 12n by pressing it. The position of the poppet 15 in the X direction, that is, the communication opening degree of the low-pressure valve unit 9 is controlled by a solenoid as a position control means described later.

  The movable portion 10a of the solenoid 10 is disposed on the proximal end side of the poppet 15 as the low pressure side valve body 9a.

  In the present embodiment, the movable portion 10a has a shape in which a first member 10c located on the distal end side in the X direction and a second member 10d located on the proximal end side are arranged in the X direction and integrally coupled to each other. . The first member 10c is formed with a concave portion 10e whose front end side expands in a mortar shape and whose proximal end side is substantially cylindrical, and the poppet 15 is loosely inserted into the concave portion 10e. At this time, the bottom surface 15 d of the poppet 15 is in contact with the bottom surface 10 f of the recess 10 e, and the poppet 15 is pressed against the first member 10 c by the coil spring 16. Due to the clearance between the inner wall of the recess 10e and the outer wall of the poppet 15, the axial deviation between the poppet 15 and the movable portion 10a can be absorbed.

  A flange portion 10g is formed at the tip of the first member 10c. The flange portion 10g is locked to the opening edge portion of the concave portion 10i formed on the distal end side of the casing 10h of the solenoid 10, whereby the movement of the movable portion 10a toward the base end side is restricted.

  A coil spring 17 as an urging means is interposed between the back surface 10j of the flange portion 10g and the stepped portion 10k formed on the side wall of the concave portion 10i. With this coil spring 17, the movable portion 10a is moved in the X direction. It is biased to the tip side.

  The recess 10 i is isolated by a ring-shaped diaphragm 18. The peripheral portion of the diaphragm 18 is mounted in a state in which a seal is secured on the casing 10h, while the central portion of the diaphragm 18 is sandwiched between the first member 10c and the second member 10d in a state in which a seal is secured. Yes.

  Here, since the concave portion 10i communicates with the concave portion 12j via a passage 10m penetrating the front and back of the flange portion 10g, the pressure acting on the inside of the concave portion 10i, that is, the front surface (surface) of the diaphragm 18 is The suction pressure Ps. On the other hand, due to the sealing by the diaphragm 18, the pressure acting on the surface (back surface) on the base end side of the diaphragm 18 is atmospheric pressure. Therefore, when the suction pressure Ps increases from a predetermined value, the movable portion 10a moves to the base end side due to the differential pressure acting on the diaphragm 18.

  Further, a shaft 19 is coupled to the movable portion 10a, and the shaft 19 is urged toward the distal end side by a coil spring 20 as an urging means disposed on the proximal end side.

  With the above configuration, when the coil 21 is energized, an attractive force toward the proximal end acts on the movable portion 10a (second member 10d), but the attractive force is adjusted by controlling the current to the coil 21. Thus, the movable portion 10a, the poppet 15 as the low-pressure side valve body 9a contacting the movable portion 10a, and the poppet 15 are balanced by the balance between the suction force and the biasing force by the coil springs 14, 16, 17, and 20 as biasing means. The position in the X direction of the poppet 13a as the high-pressure side valve body 7a provided on the spool 13 that comes into contact with is fixed.

  Here, when the movable portion 10a moves to the proximal end side by energization control to the coil 21 or the increase of the suction pressure Ps acting on the diaphragm 18, the low-pressure side valve body 9a is acted on by the action of the coil spring 16 as urging means. The poppet 15 also moves to the base end side in conjunction with the movable portion 10a, and the poppet 13a as the high-pressure side valve body 7a provided on the spool 13 by the action of the coil spring 14 as the biasing means is also movable portion 10a. It moves to the base end side in conjunction with.

  However, in the present embodiment, the spool 13 provided with the poppet 13a and the poppet 15 are not coupled to each other and can be separated from each other. Therefore, as shown in FIG. 2, the poppet 13a as the high-pressure side valve element 7a. Is seated on the bottom surface 12c as the seating surface, the poppet 15 is separated from the spool 13, and only the low-pressure valve portion 9 increases the communication opening degree.

  FIG. 6 shows the communication opening degree of the high-pressure valve part 7 and the low-pressure valve part 9 with respect to the position in the X direction of the movable part 10a in the control valve 1 having the above configuration. In FIG. 6, the horizontal axis indicates the position of the movable portion 10a in the X direction, with the right side being the proximal end side and the left side being the distal end side. The vertical axis represents the communication opening (opening area).

  The communication opening degree of the high-pressure valve part 7 changes linearly according to the position of the movable part 10a, that is, the position of the poppet 13a. That is, in the state where the movable part 10a is located at the most distal end side (FIG. 5), the communication opening degree of the high-pressure valve part 7 becomes maximum, and the communication of the high-pressure valve part 7 as the position of the movable part 10a changes to the proximal end side. The opening degree decreases linearly, and when the poppet 13a as the high pressure side valve element 7a comes into contact with the bottom surface 12c as the seating surface, the high pressure valve portion 7 is closed, and the communication opening degree becomes zero. When the high pressure valve 7 is closed, the supply of the medium into the case chamber 3 through the introduction side communication passage 6 is stopped. However, the inside of the case chamber 3 is caused by a leak from the clearance between the piston and the cylinder. The supply of media to

  The communication opening degree of the low-pressure valve part 9 also changes according to the position of the movable part 10a, but the way of change differs depending on the position of the movable part 10a. That is, first, in a state where the movable portion 10a is located at the most distal end side, the poppet 15 as the low pressure side valve body 9a contacts the bottom surface 12n as the seating surface, and the low pressure valve portion 9 is closed.

  When the position of the movable portion 10a changes to the proximal end side, the poppet 15 is separated from the bottom surface 12n. While the poppet 15 is not so far from the bottom surface 12n, the communication opening changes linearly (region 1). After that, even if the distance from the bottom surface 12n of the poppet 15 increases, the protrusion 15b and the through-hole 12a are connected with respect to the communication opening degree of the low-pressure valve portion 9 while the protrusion 15b is inserted into the through-hole 12a. The clearance becomes dominant and becomes equivalent to a fixed orifice. Therefore, in this section, the change in the communication opening is almost constant (area 2). Thereafter, when the protrusion 15b comes out of the through hole 12a, the communication opening degree of the low-pressure valve portion 9 linearly increases in accordance with the separation distance from the bottom surface 12n of the poppet 15 (region 3). In this region 3, as described above, the poppet 15, that is, the low-pressure side valve body 9 a is separated from the spool 13 including the poppet 13 a, that is, the high-pressure side valve body 7 a (gap G). Regardless of the movement of the high pressure side valve body 7a to the proximal end side being restricted and the movement of the high pressure side valve body 7a being restricted, the communication opening degree of the low pressure valve portion 9 can be quickly expanded.

  As described above, according to the present embodiment, the discharge pressure Pd acting on the poppet 13a as the high-pressure side valve body 7a acts on both the X-direction proximal end side and the distal end side of the spool 13 and is reduced. Therefore, when the high-pressure valve portion is open as in the prior art, the high-pressure valve portion is closed by the pressure Pd on the discharge flow path acting on the high-pressure side valve body, and the pressure in the case chamber is reduced. It can suppress that it falls. Therefore, in a state where the angle of the swash plate 2a of the variable capacity compressor 2 is small, the communication opening degree of the high-pressure valve portion 7 is narrowed or closed, the pressure in the case chamber 3 is reduced, and the angle of the swash plate 2a is large. It can be suppressed.

  In other words, according to the present embodiment, the angle of the swash plate 2a can be kept small and a state where there is almost no discharge capacity can be obtained more reliably, which is suitable for application to a variable capacity compressor for a so-called clutchless system. It is. In this case, there is an advantage that the number of parts can be reduced, the configuration of the apparatus can be simplified, and the weight can be reduced as compared with a system in which the rotation of the compressor is stopped using a clutch.

  And according to this embodiment, when the poppet 15 as the low pressure side valve element 9a is arranged on the base end side by the solenoid 10 as the position control means, the poppet 13a as the high pressure side valve element 7a and the low pressure side valve Since the poppet 15 as the body 9a is separated, the communication opening degree of the low pressure valve portion 9 can be expanded without the poppet 15 being restricted by the poppet 13a. Therefore, when the variable displacement compressor 2 is started, the communication opening degree of the low-pressure valve unit 9 is expanded more quickly, the control pressure Pc in the case chamber 3 is lowered, the angle of the swash plate 2a is increased, The discharge capacity can be secured more quickly.

  Further, since the high pressure side valve element 7a and the low pressure side valve element 9a are separable, even if the discharge pressure Pd acts on the high pressure side valve element 7a toward the distal end side in the X direction, There is no hindrance to the operation of the side valve body 9a toward the base end side in the X direction.

  Further, according to the present embodiment, when the poppet 13a as the high-pressure side valve body 7a and the poppet 15 as the low-pressure side valve body 9a are arranged on the distal end side by the solenoid 10 as the position control means, the low-pressure valve portion 9 is Since it is configured to be fully closed, it is easy to maintain the control pressure Pc of the case chamber 3 in a high pressure state, and energy loss can be reduced by the amount that the leakage flow rate in the low pressure valve portion 9 can be reduced.

  Further, since the low-pressure valve portion 9 is configured to be closed, the communication opening degree of the low-pressure valve portion 9 in the closed state is naturally smaller than that in the configuration in which the low-pressure valve portion 9 is not closed. Since the side valve body 9a is separated, the communication opening degree in the low pressure valve portion 9 can be expanded more quickly than in the case where these are integrated, and the low pressure valve portion 9 is closed. That is, switching from a state in which the control pressure Pc in the case chamber 3 is high to a state in which the low-pressure valve portion 9 is open, that is, a state in which the control pressure Pc in the case chamber 3 is low can be performed more quickly. Can be improved.

  Furthermore, according to the present embodiment, the poppet 13a and the poppet 15 can be more quickly separated by the coil spring 17 that biases only the poppet 15 toward the base end without biasing the poppet 13a. In addition, the communication opening degree of the low-pressure valve unit 9 can be expanded more quickly, and the control response can be improved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, the poppet valve may be changed to a ball valve or a needle valve. Further, the direction of the suction force by the solenoid, the configuration for generating the suction force, the configuration of each valve unit, the configuration of the urging means, and the like are not limited to the above embodiment.

Schematic of the apparatus structure of the variable capacity compressor and control valve concerning embodiment of this invention. It is a longitudinal cross-sectional view of the control valve of the variable capacity compressor concerning embodiment of this invention, Comprising: The figure which shows the state which the high pressure valve part closed and the low pressure valve part opened. The enlarged view of the A section of FIG. The enlarged view of the B section of FIG. It is a longitudinal cross-sectional view of the control valve of the variable capacity compressor concerning embodiment of this invention, Comprising: The figure which shows the state in which the high pressure valve part is open and the low pressure valve part is closed. The graph which shows the correlation with the position of the movable part in the control valve of the variable displacement compressor concerning embodiment of this invention, and the opening area of a high pressure valve part and a low pressure valve part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control valve 2 Variable capacity compressor 2a Swash plate 3 Case chamber 4 Discharge flow path 5 Suction flow path 6 Inlet side communication path 7 High pressure valve part 7a High pressure side valve body 8 Discharge side communication path 9 Low pressure valve part 9a Low pressure side valve body 10 Solenoid (position control means)
11 Valve part 12 Sleeve 13 Spool 13a Poppet (High pressure side valve element)
16 Coil spring (biasing means)
15 Poppet (Low pressure valve body)
18 Diaphragm Pc Control pressure Pd Discharge pressure (Discharge pressure)
Ps suction pressure (pressure on suction side)

Claims (3)

A high-pressure valve portion (7) provided in the middle of the introduction side communication passage (6) communicating the discharge flow passage (4) of the variable capacity compressor (2) and the control pressure chamber (3); and a suction flow passage (5 ) And the control pressure chamber (3) and a low pressure valve portion (9) provided in the middle of the discharge side communication passage (8), the high pressure valve portion (7) and the low pressure valve portion (9) In the control valve of the variable displacement compressor that changes the angle of the swash plate (2a) by changing the pressure of the control pressure chamber (3) by variably controlling the communication opening of
Position control means (10) for controlling the advancing and retracting positions of the high pressure side valve element (7a) of the high pressure valve part (7) and the low pressure side valve element (9a) of the low pressure valve part (9),
As the high pressure side valve element (7a) is arranged on one side by the position control means (10), the communication opening degree of the high pressure valve part (7) increases and the discharge acting on the high pressure side valve element (7a). Configured to reduce the pressure on the flow path (4) side,
The position control means (10) is configured such that the communication opening degree of the low-pressure valve part (9) increases as the low-pressure side valve element (9a) is arranged on the other side,
The high pressure side valve element (7a) and the low pressure side valve element (9a) are separated when the low pressure side valve element (9a) is arranged on the other side by the position control means (10). A control valve for a variable displacement compressor.   The low pressure valve portion (9) is configured to be fully closed when the high pressure side valve body (7a) and the low pressure side valve body (9a) are arranged on one side by the position control means (10). The control valve for a variable displacement compressor according to claim 1.   The urging means (16) for urging only the low pressure side valve element (9a) of the high pressure side valve element (7a) and the low pressure side valve element (9a) to the other side is provided. The control valve of the variable displacement compressor according to 2.

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