1. A swash plate type compressor comprising:
a swash plate provided swingably, a swash angle of the swash plate to a rotational central axis being adjustable;
a compression mechanism comprising a piston and a cylinder, and configured to be driven due to a swing of the swash plate to compress gas suctioned from a suction chamber and to discharge the compressed gas to a discharge chamber;
a crank chamber configured to apply a crank pressure to the swash plate and a head of the piston;
a capacity control valve configured to adjust the swash angle of the swash plate by introducing the gas in the discharge chamber to the crank chamber through an introduction flow passage; and
a differential pressure control valve that is provided independently from the capacity control valve and is operable independently from the capacity control valve according to a differential pressure between the crank pressure of the crank chamber and a suction pressure of the compression mechanism, and, when operated, is configured to adjust an opening of the introduction flow passage to prevent the crank pressure from exceeding a predetermined value,
wherein the differential pressure control valve includes a valve body and an urging unit that urges the valve body in a direction for opening the introduction flow passage;
wherein the valve body is configured to:
be provided movably between a close position and an open position of the introduction flow passage,
receive a force for moving toward the close position by the crank pressure,
receive a force for moving toward the open position by the suction pressure, and
move to the close position to close the introduction flow passage when the differential pressure exceeds an urging force of the urging unit,
wherein a bypass passage is formed on the valve body, and
wherein the valve body and the bypass passage are configured such that a given amount of gas flows along the introduction flow passage through the bypass passage when the valve body moves to the close position.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
I claim:
1. An air filter assembly, comprising:
an electrostatic field generator that provides an electrostatic field; and
a filter having an inlet side and an outlet side with a first porosity at the inlet side and a second, lower porosity at the outlet side, the filter being electrostatically charged by the field generator.
2. The assembly of claim 1, wherein the filter comprises a plurality of layers of filter material and wherein a first one of the layers has the first porosity and a second layer has the second porosity.
3. The assembly of claim 2, including at least one layer between the first and second layers having a third porosity that is greater than the second porosity and lesser than the first porosity.
4. The assembly of claim 1, wherein the filter includes a single filter material that has a decreasing porosity in a direction from the inlet side to the outlet side.
5. The assembly of claim 4, wherein the filter material comprises a foam having a lower density at the inlet side and a higher density at the outlet side.
6. The assembly of claim 5, wherein the density progressively increases between the inlet and outlet sides.
7. The assembly of claim 1, wherein the field generator includes a first electrode associated with the inlet side of the filter and a second electrode associated with the outlet side of the filter.
8. The assembly of claim 7, wherein the filter includes at least one layer of filter material that operates as the second electrode.
9. The assembly of claim 8, wherein the one layer of filter material comprises a carbon impregnated foam.
10. An air handler assembly, comprising:
a housing;
an air mover supported within the housing;
an electrostatic field generator supported within the housing that provides an electrostatic field; and
a filter having an inlet side and an outlet side with a first porosity at the inlet side and a second, lower porosity at the outlet side, the filter being electrostatically charged by the field generator.
11. The assembly of claim 10, wherein the filter comprises a plurality of layers of filter material and wherein a first one of the layers has the first porosity and a second layer has the second porosity.
12. The assembly of claim 11, including at least one layer between the first and second layers having a third porosity that is greater than the second porosity and lesser than the first porosity.
13. The assembly of claim 10, wherein the filter includes a single filter material that has a decreasing porosity in a direction from the inlet side to the outlet side.
14. The assembly of claim 13, wherein the filter material comprises a foam having a lower density at the inlet side and a higher density at the outlet side.
15. The assembly of claim 14, wherein the density progressively increases between the inlet and outlet sides.
16. The assembly of claim 10, wherein the field generator includes a first electrode associated with the inlet side of the filter and a second electrode associated with the outlet side of the filter.
17. The assembly of claim 16, wherein the filter includes at least one layer of filter material that operates as the second electrode.
18. The assembly of claim 17, wherein the one layer of filter material comprises a carbon impregnated foam.