摘要:
A variable capacity vane compressor in which one of front and rear side blocks has at least one inlet port divided into first and second portions, and a control element has at least one pressure-receiving protuberance dividing a space formed in the one side block into first and second pressure chambers, wherein the control element angularly moves in response to a differential pressure between the first and second pressure chambers, to vary the opening angle of the second portion of the at least one inlet port. A torsion coiled spring is fitted around a hub of the one side block for biasing the control element in a circumferential direction of increasing the opening angle of the second portion of the inlet port. The torsion coiled spring has an end thereof provided with a first engaging portion engaging a first retaining device provided in the control element, and another end thereof provided with a second engaging portion engaging a second retaining device provided in the hub, through a holding device. The second engaging portion of the spring comprises a first portion and a second portion extending at a predetermined angle with respect to the first portion and forming a tip, thus presenting a bent portion together with the first portion. The second retaining device of the hub comprises a first retaining portion engaging the first portion of the second engaging portion of the spring, and a second retaining portion extending at a predetermined angle with respect to the first retaining portion and engaging the second portion of the second engaging portion of the spring.
摘要:
A variable capacity vane compressor comprising a control element having at least one pressure-receiving protuberance dividing a space into a first and a second pressure chamber, wherein the control element angularly moves in response to a differential pressure between the first and second pressure chambers, to vary an opening angle of a second portion of at least one inlet port. The control element has mounted thereon a sealing member for sealing between the first and second pressure chambers and between a low pressure chamber and a vane back pressure zone. The sealing member comprises a first sealing portion for sealing between a peripheral wall surface of a central bore in the control element and an inner peripheral side wall surface of an annular recess in a side block, a second sealing portion for sealing between an outer peripheral surface of the control element and an outer peripheral side wall surface of the annular recess, a third sealing portion for sealing between an outer peripheral edge of the pressure-receiving protuberance and the wall surface of the space, and a fourth sealing portion for sealing between an axial end face of the control element and a bottom wall surface of the annular recess.
摘要:
A variable capacity vane compressor has an annular control element angularly displaceably received within an annular recess formed in one of side blocks defining a cylinder. The control element is angularly displaced in response to a difference in pressure between first and second pressure chambers formed in the one side block and communicating with a zone under lower pressure and a zone under higher pressure, respectively, and to the biasing force of a biasing member, thereby varying the opening angle of at least one second inlet port formed in the one side block and hence controlling the capacity of the compressor. A positioning device is provided at a radially inner portion of the control element to radially position the control element in place within the annular recess of the one side block with reference to the radially inner portion of the control element, thus relieving the hysteresis between angular displacement of the control element in one circumferential directions and that in the opposite direction. At least one oil groove is formed in the inner peripheral surface of the control element to guide lubricating oil for lubricating the same element and its associated sliding parts to a sufficient degree to further reduce the hysteresis.
摘要:
A variable capacity vane compressor has an annular control element angluarly displaceably received within an annular recess formed in one of side blocks defining a cylinder. The control element is angularly displaced in response to a difference in pressure between first and second pressure chambers formed in the one side block and communicating with a zone under lower pressure and a zone under higher pressure, respectively, and to the biasing force of a biasing member, thereby varying the opening angle of at least one second inlet port formed in the one side block and hence controlling the capacity of the compressor. A positioning device is provided at a radially inner portion of the control element to radially position the control element in place within the annular recess of the one side block with reference to the radially inner portion of the control element, thus relieving the hysteresis between angular displacement of the control element in one circumferential directions and that in the opposite direction.
摘要:
A sliding-vane rotary compressor includes a recess defined in a cylinder and to which a discharge hole is open, a cover secured to the cylinder to close the recess, a discharge valve disposed in a valve receiving chamber defined between the cover and the cylinder, and a discharge connecting hole extending in the cylinder and a side block for connecting the interior space of the recess and a high pressure chamber. The compressor thus constructed is simple in size and light in weight due to non-inclusion of a shell which is required in the conventional compressor. Preferably, a displacement adjustment mechanism is incorporated in the compressor for adjusting the displacement of the latter.
摘要:
A cylinder has at least one valve seating surface-forming portion which has an outer surface formed therein with at least one recess, the bottom surface of which serves as a valve seating surface. A discharge valve is arranged on the outer surface of the valve seating surface-forming portion to close or open outlet holes formed in respective ones of the valve seating surface at locations where the wall thickness of the cylinder is the minimum. The discharge valve has at least one elastic valve body having an arcuate cross section and disposed in tight contact with a corresponding one of the valve seating surface. The valve seating surface is arcuately concavely cured with almost the same radius of curvature as that of the valve body of the discharge valve.
摘要:
A variable capacity vane compressor comprises additional refrigerant inlet ports formed in one of front and rear side blocks of a cylinder accommodating a rotor, and communicating a suction chamber with a compression chamber on a suction stroke, and a control element received in a recess formed in an end face of the above one side block facing the rotor, for rotation to vary the opening angle of the additional inlet ports to thereby control the compression commencing timing of compression medium. At least one spacer is interposed between the control element and at least one of the above one side block and the rotor, for maintaining a predetermined minimum clearance therebetween.
摘要:
A variable capacity vane compressor has a pressure chamber formed in one of side blocks of a cylinder and communicating a zone under lower pressure with a zone under higher pressure, and at least one second inlet port the opening angle of which is variable in response to a difference between pressure within a first pressure chamber of the pressure chamber and pressure within a second pressure chamber of same. The second pressure chamber is communicated with the zone under higher pressure via a high-pressure communication passage and with the zone under lower pressure via a low-pressure communication passage. A control valve device extends across the high-pressure communication passage and the low-pressure communication passage, and is disposed to close the low-pressure communication passage and simultaneously open the high-pressure communication passage when pressure within the zone under lower pressure exceeds a predetermined value, and to open the low-pressure communication passage and simultaneously effect one of closing and reduction of the opening area of the high-pressure communication passage when the pressure within the zone under lower pressure is below the predetermined value, whereby the capacity of the compressor can be varied with high responsiveness.
摘要:
In a sliding-vane rotary compressor, one of the opposite open ends of a cylinder is closed by a first head, the other open end being closed by a side block to which is secured a second head so as to define jointly with the side block a low pressure chamber and a high pressure chamber. With this construction, one side block can be omitted and hence the number of structural components is reduced. Preferably, a displacement adjustment mechanism is incorporated in the side block and the second head for adjusting the displacement of the compressor.
摘要:
A vane compressor is provided with a control valve device having a deformable member disposed within a zone under low pressure for expansion and contraction in response to pressure therein. A pressure-responsive control device is associated with the control valve device for controlling the capacity of the compressor. The deformable member contracts and causes the control device to bring the compressor into full-capacity operation when the pressure within the zone under low pressure is higher than a predetermined value, whereas the deformable member expands and causes the control device to bring the compressor into partial-capacity operation when the pressure within the zone under low pressure is lower than the predetermined value. A device is provided which is operable in response to excessive expansion of the deformable member for causing the control device to bring the compressor into full-capacity operation.