DE1653446A1 - Cylinder head with valve - Google Patents

Description

Applicant: (Jolden Arrow Manufacturing Limited,

14-39 - 17th Avenue, S.S., Galgary, Alberta, Oanada

Cylinder head with valve

The invention relates to piston pumps, in particular therefor provided cylinder head arrangements in which suction and Drain valves are provided

The cylinder heads are usually made from a metal casting which require very precise, and therefore costly, machining to ensure an accurate fit on the cylinder block and fit of the valve components

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to enable them, for their part, also with utterer .Accuracy established; his fines «In addition, the Installation of the valve parts in standard cylinder heads requires special tools and trained specialists · From these Basically, the known old valve-equipped heads are expensive and difficult to operate and maintain abrasive and / or corrosive liquids, such as chemical sprays used in agriculture, for example, increase the difficulties caused by the frequent maintenance and replacement of components

The object of the invention is to reduce the disadvantages of the known valve head pieces or to eliminate them entirely and to create a device which works properly and in which the valve components are more easily Way can be assembled and removed from the head piece without the need for any special tools or Material work is required

This object is achieved in that the valve components largely made of plastic and used in a metal casting, which itself is no special

109845/0272 ORIGINAL INSPECTED

Machining required · To seal the plastic valve parts against the non-machined surfaces of the head casting, rings made of elastomers are used to avoid leakage losses and the head piece itself against the To seal the cylinder block

The invention is explained in more detail with reference to the drawing, in which an exemplary embodiment is shown.

You see a vertical section of the cylinder head provided with a valve, which is arranged on a cylinder block

The cylinder head is generally designated 10 and is seated on a cylinder block 11, which has any construction that meets the requirements. The cylinder 12 itself can be made of a metallic or ceramic Lining 13 may be provided. The block 11 can have suction and discharge passages 14, 15 on opposite sides of the cylinder 12. This training of the block is as Example given and is not a feature of the invention

The valve-provided cylinder head 10 consists of a metal head casting 16 which is completely unmachined

109845/0272

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But Έΰ is gonsen with a very fine hand, ßo neine surfaces üv, β j * cdc bend smooth bind, in order to effectively touch the elastomer "Di ob Irinnen" in and on, every Kon1; a] rt £ t (; 33c KiJt dom Κορί ^ υΠί-ίπΊαΙ: a licking etii verrotiiden

The head piece 10 is releasably fastened to the cylinder block by means of a plurality of cylinder head screws (not shown) known per se. Suction and outlet openings 17 and 18 are arranged in the head piece, which are aligned with the corresponding suction and outlet passages ΛΜ and 15 in the cylinder block. The lower surface 19 of the casting, which abuts the cylinder block, is provided with annular grooves arranged concentrically with the suction and discharge openings 17 * 8, in which the O-parts 20 are made of elastomeric «! Material are inserted · These seal the head piece against the block and prevent leakage at the connection points of the passage · 14, 15 or the corresponding openings 17 »18. The grooves for the binge 20 are formed at the same time as the metal head casting.

The head casting 16 has a central caramer 21 between the openings 17, 18. This chamber 21 has an open one

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Bottom, an upwardly sloping annular side wall 21 'and upwardly directed chamber extensions 21a, 21b, which communicate with the suction and discharge openings 17 and 18, respectively. This is how the suction and discharge openings stand via the chamber 21 with the cylinder 12 in connection.

The valve arrangement includes an insert made of plastic, which is provided in the chamber 21. This commitment forms the Support for the valve cages and valve seats. To facilitate manufacture and assembly, the insert preferably in the form of two superimposed, complementary, disk-shaped insert parts 22, 23 made of plastic. The side walls of these insert parts are beveled upwards in order to match the sloping side wall 21 * to adapt to chamber 21. The lower surface 23 * of the lower insert part 23 lies in the same plane with the lower surface 19 of the head casting 16 and is with a annular groove provided in which an O-ring 24 is made elastomer · * material is inserted. This O-input 24 touches sealing the upper surface of the cylinder liner 13 or the upper surface of the cylinder block if the liner 13 is missing. The groove for the sealing ring 24 is when

109845/0272

. Forming or pressing of the lower insert part 23 is formed, so that special processing is not required.

The inserts 22, 23 form a support for a suction valve cage 25 made of plastic, which cooperates with a suction valve 26 also made of plastic. Of the Cage 25 has a circular end portion 25a, the one-piece with side parts running around the circumference 25b is formed. These protrude against the seat 26 and touch and hold it in the chamber extension 21a. In this way, the seat 26 is aligned with the suction opening 17. A disk-shaped valve body 28 is in the cage 25 movably arranged and is pressed elastically against the seat 26 by a compression spring 27. The spring is between the valve body 28 and the end portion 25a of the cage 25 are attached. This end part holds the spring 27 aittig and is integrally formed with a hub 25c, which acts as a delimitation serves to move the valve body 28 when it moves away from the seat 26.

The entire valve cage 25 and the seat 26 are made of molded plastic, while the valve body 28 is made of one

OBfGIMAL INSPECTS) 109845/0272

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harder material, TorKugsweise metal ceramic υάπτ _s eating prepared During the / Ceughiib «^ OCE Ρΐίΐ φβ wirö the Ve '·· tij.körper 8 veer the Fedo- the I-raft, -? 9 from Site 26 ävv wegin direction? I have 2 ^ e sucked up the B-ii ^ cligang of liquid from the suckling opening. 1? is facilitated by the suction valve in the cylinder 12.

The design of the outlet valve is the same as that of the suction valve, only it is arranged the other way around. This exhaust valve "consists of an exhaust valve cage 29 made of plastic, the seat with a discharge valve 30, also made of plastic, cooperates · The Ventilsits 30 is supported by the upper Eineatzteil 22, so that the valve cage 29 on the above extension 21b of the chamber 21 at rest, communicating with the outlet opening 18. A valve body 31 made of metal or ceramic is provided in the cage 29, which is pressed by a compression spring 32 against the seat 30. During the relaunch stroke of the pump, the valve body 31 is removed from the seat against the spring action 32 30 pushed away to facilitate the passage of the liquid from the cylinder 12 through the outlet valve into the outlet port.

In order to avoid leakage losses in the valve, there is a space between the suction valve seat 26 and the wall of the chamber extension 21a around the nursing opening 1? an O-ring 33 is inserted. The seat 26 has a bevel 34 to accommodate the ring 33 · Um the outlet valve seat 30 is on the upper part of the insert 22 A sealing ring 35 which engages in a bevel 36 is also used. This bevel is in the head casting at the junction of the side wall 21 'of the chamber 21 with the chamber extension 21b. In addition, between the Insert parts 22, 23 a sealing ring 37 made of elastomers is provided which touches the side wall 21 * of the chamber · The Hing 37 sits in a bevel 38 formed in insert part 23.

The inserts 22, 23 hold the valve cages and seats in the correct position in the head casting. It is conceivable that these two insert parts are designed as one unit. But in practice there is such a one-part development Difficulties can encounter, these parts 22, 23 are preferably as two separate complementary components manufactured.

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As already stated at the beginning, this makes it easier Formation of the valve cages and the valve seats from plastic together with the elastomer sealing rings the installation of the entire valve in head casting, which is completely unbev works is · However, because no processing is necessary, considerable cost savings are achieved and the entire production can be done more economically · Just as important and advantageous is the fact that the valve means, i.e. the cages 25, 29, the seats 26, 30, the valve bodies 31, 28, the springs 29, 32 and the Support inserts 22, 23 are quickly and easily installed and removed from the head casting by hand without any tools this can be easily removed again. So when the head is detached from the cylinder block, the maintenance, Monitoring or the replacement of individual or all valve components is extremely easy and convenient. It will be in this context particularly pointed out that the tapered side wall 21 * of the chamber 21 of the insertion of the conical insert parts 22, 23 into the chamber very much easier and that the various components of the valve are held securely in place when the head is sealed against the block and is firmly attached.

1 09845/0272

ORIGINAL INSPECTED

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The annular Eineatzteile 22, 23 delimit a cavity 39, which connects the valve cages 25, 29 to the cylinder 12 through the open bottom of the chamber 21. This The cavity is relatively large, so it can also be wetted Powders, which are commonly used in spraying, can go through well and wear and tear and the service life of the valve is significantly increased.

109845/0272 originally inspected

Claims (1)

) Cylinder head with valve for piston pumps, d a d u r cn marked that a Cast metal head (16) with suction and outlet openings (17 »18) which are in communication with a cylinder (12) via a chamber (21), in the chamber an insert (22, 25) made of plastic is arranged, on which a suction valve cage (25) made of plastic and a cooperating with this Plastic suction valve seat (26) rests with the suction opening (17) is aligned, a suction valve body in the suction valve cage (28) is made of a harder material made of plastic and is pressed against the suction valve seat by a spring (27), furthermore in the chamber (21) an outlet valve cage (29) made of plastic and interacting with an outlet valve seat (30) de «insert (22, 23) rests, and with the outlet opening (18) communicates, and that in the exhaust valve cage an outlet valve body (31) by a spring (32) against the valve seat (50) is printed and consists of a material, that is harder than plastic. 2 * cylinder head according to claim 1, characterized in that the suction and discharge valve bodies (28, 31) are made of metal or a ceramic material. HJ a «A5 / 077 / ORfGfWAF. 3. Cylinder head according to claim 1, characterized in that the metal casting forming the cylinder head (16) "perfect is unmachined and the head and the wall of the chamber (21) and the insert (23) opposite the cylinder (12) by sealing rings (20, 24) made of elastomeric material are sealed. 4 ·. Cylinder head according to claim 1, characterized in that the head casting (16) has a groove on its lower surface (19) for receiving the sealing ring (20). 5. Cylinder head according to claim 1, characterized in that the insert (22, 23) »the suction valve seat (26) and the outlet valve seat (30) is sealed off from the chamber wall (21) by a sealing ring (37 »33» 35) made of elastomeric material are, 6. Cylinder head according to claim 1, characterized in that the insert in the chamber (21) consists of two complementary Divide (22, 23) consists. HJ y 8 L 5/0 2 7 '£