IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0564947
(1983-12-23)
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발명자
/ 주소 |
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출원인 / 주소 |
- International Telephone and Telegraph Corporation
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대리인 / 주소 |
O'Halloran, John T.Ruzek, Peter R.
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인용정보 |
피인용 횟수 :
7 인용 특허 :
2 |
초록
▼
A diaphragm pump pumping arrangement includes two diaphragm pumps which are arranged and operate in tandem. Each of the diaphragm pumps includes a housing and a movable wall that includes a flexible diaphragm and subdivides the interior of the respective pump housing into a pumping chamber and an ac
A diaphragm pump pumping arrangement includes two diaphragm pumps which are arranged and operate in tandem. Each of the diaphragm pumps includes a housing and a movable wall that includes a flexible diaphragm and subdivides the interior of the respective pump housing into a pumping chamber and an actuating chamber. An air distributing control arrangement interposed between and connected to the pump housings includes a spool valve movable in a bore of an aluminum casing of the control arrangement between two end positions in which it alternatingly achieves the admission of the compressed air into one, and discharge of the air from the other, actuating chamber. The spool valve is displaced due to the action of respective limiting valves accommodated in individual bores of the control arrangement and displaced by the respective movable walls from their rest positions in which they admit the ambient pressure to the associated end faces to their active positions in which they admit the compressed air to the associated end faces of the spool valve. The spool valve carries sealing rings of a material that needs no lubrication, and is made, at least at its peripheral surface, of a material that also needs no lubrication, and the surface bounding the bore for the spool valve is hard-anodized, so that no external lubrication of the control arrangement, by lubricant entrained in the compressed air or otherwise, is needed.
대표청구항
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1. A limiting valve assembly for use with a reciprocating member and a pressurized medium user, comprising: a housing having a bore which opens toward the movable member; a limiting valve assembly accommodated in said bore and including a valve member guided in said bore for movement in opposite
1. A limiting valve assembly for use with a reciprocating member and a pressurized medium user, comprising: a housing having a bore which opens toward the movable member; a limiting valve assembly accommodated in said bore and including a valve member guided in said bore for movement in opposite axial directions between two end positions and having a stem portion projecting from said bore into the path of movement of the movable member to be moved by the latter from one of said end positions toward the other, axially spaced first and second confining portions at the region of said stem portion, and a spring urging said valve member toward said one end position; means for supplying a pressurized gaseous medium to a first region of said bore; means for discharging gaseous medium from a second region of said bore that is axially spaced from said first region; means for communicating a third region of said bore that is situated between said first and second regions with the user; and means in said bore for sealingly separating said communicating means from said supplying means in said one end position, and from said discharging means in said other end position, of said valve member, including an annular element stationarily mounted in the respective bore at said third region and situated between said confining portions of the respective valve member, said annular element having a central passage through which said stem portion passes with clearance and a substantially radial passage that connects said central passage with said communicating means, each of said two sealing elements being arranged around said stem portion at a different axial side of said annular element and between the latter and the respective confining portion to be confined therebetween and sealingly interrupt communication of said communicating means with said supplying means in said one, and with said discharging means in said other of said end positions of said valve member, and to become spaced therefrom and allow communication of said communicating means with said discharging means in said one, and with said supplying means in said other, of said end positions of said valve member to thereby alternately admit the pressurized gaseous medium to and discharge the gaseous medium from the user. 2. A diaphragm pump for pumping liquids, especially such having a high viscosity, comprising: two diaphragm pump arrangements arranged along a common axis in opposing relationship to one another and each including a casing having inlet and outlet ports for the liquid to be pumped, and a movable wall sealingly subdividing the interior of the casing into a pumping chamber and an actuating chamber; a shaft extending in parallelism with said axis and interconnecting said movable walls of said diaphragm pump arrangement for movement in unison; and means for operating said pump arrangements to alternatingly draw the liquid into and expel the same out of the respective pumping chambers through the respective inlet and outlet ports including a control housing interposed between and secured to said casings and having three bores therethrough at least two of which extend substantially parallel to said axis, two limiting valve assemblies each accommodated in one of said two bores and including a valve member guided in the respective bore for movement in opposite axial directions between two end positions and having a stem portion projecting into a different one of said actuating chambers for each of said valve members and into the path of movement of the respective movable wall to be moved by the latter from one of said end positions toward the other, axially spaced first and second confining portions at the region of said stem portion, and a spring urging said valve member toward said one end position, a spool valve accommodated in the remaining one of said three bores for movement axially thereof between two terminal positions and having a circumferential surface having two distributing grooves and two end faces that delimit in said remaining bore respective end spaces, means for supplying a pressurized gaseous medium into said bores and to a first region of each of said two bores, means for discharging gaseous medium from said bores and from a second region of each of said two bores that is axially spaced from said first region, means for communicating a third region of each of said two bores that is situated between said first and second regions with a different one of said end spaces of said remaining bore, means for separately establishing communication between said remaining bore and each of said actuating chambers, and means in each of said two bores for sealingly separating said communicating means from said supplying means in said one end position, and from said discharging means in said other end position, of the respective valve member, said sealingly separating means including an annular element stationarily mounted in the respective bore at said third region and situated between said confining portions of the respective valve member, said annular element having a central passage through which the respective stem portion passes with clearance and a substantially radial passage that connects said central passage with said communicating means, said two sealing elements each being arranged around said stem portion at a different axial side of said annular element and between the latter and the respective confining portion to be confined therebetween and sealingly interrupt communication of said communicating means with said supplying means in said one, and with said discharging means in said other of said end positions of said valve member, and to become spaced therefrom and allow communication of said communicating means with said discharging means in said one, and with said supplying means in said other, of said end positions of said valve member to thereby admit the pressurized gaseous medium into one and discharge the gaseous medium from the respective other of said end spaces with attendant movement of said spool valve from one to the other of said terminal positions thereof in which communication is established via the respective distributing channels between said supplying means and one of said actuating chambers, and the respective other of said actuating chambers and said discharging means. 3. The diaphragm pump as defined in claim 2, wherein said spool member is, at least at its portion contacting the surface bounding said remaining bore, of a material requiring no external lubrication. 4. The diaphragm pump as defined in claim 3, wherein said material is a synthetic plastic material. 5. The diaphragm pump as defined in claim 4, wherein said synthetic plastic material is polytetrafluoroethylene filled with mica. 6. The diaphragm pump as defined in claim 2, wherein said spool valve has external grooves at respective end portions thereof, which open onto said circumferential surface; and further comprising separating rings accommodated in said grooves and contacting the surface bounding said remaining bore. 7. The diaphragm pump as defined in claim 6, and further comprising resilient expansion rings received in said grooves of said spool valve internally of said separating rings and urging the latter radially outwardly into contact with the surface bounding said remaining bore. 8. The diaphragm pump as defined in claim 6, wherein said separating rings are of a material requiring no external lubrication. 9. The diaphragm pump as defined in claim 8, wherein said material is a synthetic plastic material. 10. The diaphragm pump as defined in claim 9, wherein said synthetic plastic material is polytetrafluoroethylene filled with graphite. 11. The diaphragm pump as defined in claim 2, wherein at least the surface bounding said remaining bore is constituted by a hardened layer. 12. The diaphragm pump as defined in claim 11, wherein said housing is of aluminum; and wherein said hardened layer is an anodized layer of the aluminum of said housing.
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