Suction device

Abstract

A suction device comprises a first element, a second element, and an intermediate element. The first element comprises a first control volume having a first pressure. The second element comprises a second control volume having a second pressure. The intermediate element is controlled by the first pressure of the first control volume of the first element and the second pressure of the second control volume of the second element. When the first control volume of the first element is varied, the varied first control volume of the first element can substantially have the first pressure under automatic pressure compensation by the second pressure of the second control volume of the second element via the intermediate element.

1 . A suction device, comprising:
 a first element, comprising a first control volume having a first pressure;   a second element, comprising a second control volume having a second pressure; and   an intermediate element, controlled by the first pressure of the first control volume in the first element and the second pressure of the second control volume in the second element,   wherein when the first control volume of the first element is varied to a varied first control volume, automatic pressure compensation happens on the varied first control volume according to the second pressure of the second control volume in the second element via the intermediate element, so that the varied first control volume of the first element has the first pressure, substantially.   
     
     
         2 . The suction device as claimed in  claim 1 , wherein the ratio of the first pressure of the first control volume in the first element to the second pressure of the second control volume in the second element is a predetermined ratio, and the second control volume of the second element is varied to a varied second control volume after the automatic pressure compensation, and the predetermined ratio of the first pressure of the varied first control volume in the first element to the second pressure of the varied second control volume in the second element is maintained. 
     
     
         3 . The suction device as claimed in  claim 1 , further comprising:
 a suction plate, communicated with the first control volume or the varied first control volume of the first element,   wherein the first pressure of the first control volume in the first element or the first pressure of the varied first control volume in the first element produces a suction action on an object via the suction plate.   
     
     
         4 . A suction device, comprising:
 a first element, comprising a first container;   a second element, comprising a second container; and   an intermediate element, comprising a first action end and a second action end, wherein the first action end and the second action end are disposed in the first container and the second container, respectively,   wherein when the second element is moved relatively to the first element, a first control volume is formed in the first container between an end of the first element and the first action end of the intermediate element, and a second control volume is formed in the second container between an end of the second element and the second action end of the intermediate element, wherein the first control volume in the first container of the first element has a first pressure, the second control volume in the second container of the second element has a second pressure, and the ratio of the first pressure to the second pressure is a predetermined ratio, and   when one of the second control volume in the second container of the second element and the first control volume in the first container of the first element is varied, automatic pressure compensation happens on the other one of the second control volume in the second container of the second element and the first control volume in the first container of the first element, so that the varied first control volume in the first container of the first element has the first pressure, the varied second control volume in the second container of the second element has the second pressure, and the predetermined ratio of the first pressure to the second pressure is maintained.   
     
     
         5 . The suction device as claimed in  claim 4 , wherein the predetermined ratio is the ratio of a second sectional area of the second action end of the intermediate element to a first sectional area of the first action end of the intermediate element. 
     
     
         6 . The suction device as claimed in  claim 4 , further comprising:
 a suction plate, communicated with the first container of the first element or the second container of the second element,   wherein the first pressure of the first control volume or the varied first control volume in the first container of the first element or the second pressure of the second control volume or the varied second control volume in the second container of the second element produces a suction action on an object via the suction plate.   
     
     
         7 . A suction device, comprising:
 a first element, comprising a first container;   a second element, comprising a second container communicated with the first container of the first element; and   an intermediate element, comprising a first action end and a second action end, wherein the first action end and the second action end are disposed in the first container and the second container, respectively,   wherein when the second element is moved relatively to the first element, a first control volume is formed in the first container between an end of the first element and the first action end of the intermediate element, and a second control volume is formed in the second container between an end of the second element and the second action end of the intermediate element, wherein the first control volume in the first container of the first element has a first pressure, the second control volume in the second container of the second element has a second pressure, and the ratio of the first pressure to the second pressure is a predetermined ratio, and   when the second control volume in the second container of the second element is varied, automatic pressure compensation happens on the first control volume in the first container of the first element, so that a varied first control volume in the first container of the first element has the first pressure, a varied second control volume in the second container of the second element has the second pressure, and the predetermined ratio of the first pressure to the second pressure is maintained.   
     
     
         8 . The suction device as claimed in  claim 7 , wherein the predetermined ratio is the ratio of a second sectional area of the second action end of the intermediate element to a first sectional area of the first action end of the intermediate element. 
     
     
         9 . The suction device as claimed in  claim 7 , further comprising:
 a suction plate, communicated with the first control volume in the first container of the first element,   wherein the first pressure of the first control volume in the first container of the first element produces a suction action on an object via the suction plate.   
     
     
         10 . The suction device as claimed in  claim 9 , further comprising:
 a valve element, disposed between the first control volume of the first container of the first element and the suction plate.