The present invention relates to a throttling structure for use in a fluid pressure device. A nozzle passage is formed between a primary side port and a nozzle back pressure chamber. A throttling mechanism made up from a plurality of orifice plates is disposed in the nozzle passage. Small diameter o
The present invention relates to a throttling structure for use in a fluid pressure device. A nozzle passage is formed between a primary side port and a nozzle back pressure chamber. A throttling mechanism made up from a plurality of orifice plates is disposed in the nozzle passage. Small diameter opening holes, which are smaller in diameter than the nozzle passage, are provided in the orifice plates. Outer edge portions of the orifice plates are retained in a second body part via seal members. Further, the orifice plates are separated mutually from each other by a predetermined distance along the direction of extension of the nozzle passage.
대표청구항▼
1. A throttling structure for use in a fluid pressure device having a body, including a first body part, a second body part arranged on an upper portion of the first body part, and a third body part arranged on a further upper portion of the second body part, in which a port is formed in the first b
1. A throttling structure for use in a fluid pressure device having a body, including a first body part, a second body part arranged on an upper portion of the first body part, and a third body part arranged on a further upper portion of the second body part, in which a port is formed in the first body part to which a pressure fluid is supplied, for carrying out a pressure control on the pressure fluid, comprising: an introduction chamber configured to be provided between the second body part and the third body part into which the pressure fluid is introduced;a communication passage configured to provide communication between the introduction chamber and the port, the communication passage extending along an axial direction of the second and third body parts, bending in a radial direction within the third body part, and connecting to a communication hole in communication with the introduction chamber; anda throttling mechanism disposed in the communication passage and having a plurality of flow passages through which the pressure fluid flows, the flow passages being smaller in diameter than the communication passage, for reducing a flow amount of the pressure fluid,wherein the plurality of flow passages are disposed mutually adjacent to each other at predetermined intervals along a flow direction of the pressure fluid, andwherein the throttling mechanism includes a plurality of orifice plates with seal members provided on peripheral edges of the orifice plates such that at least one of the seal members is sandwiched between the orifice plates, each of the orifice plates includes an opening hole provided in a middle of the orifice plate and defining the flow passage, the opening holes being aligned with each other and parallel to the flow passage, a lowermost orifice plate being sandwiched, in the axial direction, between a lowermost seal member abutting the upper portion of the first body part and a lower portion of the second body part, and an uppermost orifice plate abutting an uppermost seal member abutting a lower portion of the third body part. 2. The throttling structure according to claim 1, wherein the plural flow passages are arranged in parallel to the flow direction of the pressure fluid, and further, are separated mutually from each other along a direction of extension of the communication passage. 3. The throttling structure according to claim 2, wherein the plural flow passages are disposed along a straight line coaxially in the communication passage. 4. The throttling structure according to claim 3, wherein among the plurality of flow passages, a flow amount of the pressure fluid is made to change by changing a distance between two adjacent flow passages. 5. The throttling structure according to claim 4, wherein among the plurality of flow passages, the distance between two adjacent flow passages is set to be at least 20 times the diameter of the flow passages. 6. The throttling structure according to claim 1, the fluid pressure device further comprising: a diaphragm chamber that communicates with the introduction chamber through a nozzle; anda flapper disposed in the diaphragm chamber, the flapper controlling the flow of the pressure fluid introduced from the introduction chamber into the diaphragm chamber via the nozzle, by means of separating and blocking actions of the flapper with respect to the nozzle,wherein the fluid pressure device comprises a pressure reducing valve, in which the pressure fluid supplied from one port is reduced in pressure to a desired pressure and is directed to another port.
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이 특허에 인용된 특허 (7)
Tominaga, Takashi; Nishiwaki, Tadashi, Common rail having orifice.
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