| 摘要 |
PURPOSE:To make a pressure balance inside a pump housing securable, by shifting the phase between suction and discharge ports installed in one operating chamber of multiring pumps as far as at least 180 deg. from the phase of suction and discharge ports installed in one operating chamber of others. CONSTITUTION:First and second suction ports 21 and 21' as well as first and second discharge ports 22 and 22' are shifted as far as 180 deg. in their phase each in design. In time of suction completion, if an operating chamber 1 is in a state of low pressure, each of operating chambers P2-2 and P3-1 is in low pressure as well, while each of operating chambers P2-1 and P3-2 is in high pressure the other way. Also an operating chamber 4 finishes its suction and thereby being in low pressure, so that a pressure balance is kept up as whole, thus load distribution onto a bearing assembly receiving the thrust load imposed on a movable ring part 1 approximates to uniformity. |
