PNEUMATIC PINCH VALVE

• US 20070170382A1
• Filed: 11/28/2006
• Published: 07/26/2007
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (Excelsior Union Ltd.)
• Original Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (Excelsior Union Ltd.)
• Inventors: Yan, Yan, Li, Lechang
• Granted Patent: US 8,087,635 B2
• Time in Patent Office: Days
• US Class Current: 251/5
• CPC Class Codes: F16K 31/122 the fluid acting on a piston F16K31/143, F16K31/163, F16K31/363, F16K31/383 take precedence
• CPC Class Codes: F16K 7/06 by means of a screw-spindle, cam, or other mechanical means F16K7/045 takes precedence

Abstract

The present invention provides a pneumatic pinch valve, comprising: a lever and a pressing piece, a fluid tube receiving space being formed between the lever and the pressing piece, wherein the pneumatic pinch valve further comprises a main body providing a cavity therein, the lever being installed on the main body; a piston provided in the cavity of the main body, the piston engaging with an inner wall of the cavity of the main body so as to divide the cavity into a first cavity and a second cavity, the pressing piece being positioned in the second cavity and supported on the piston; an air inlet port provided at the first cavity, wherein air introduced into the first cavity via the air inlet port moves the piston toward the fluid tube receiving space so as to press the fluid tube through an engagement of the pressing piece on the piston with the lever, and thus intercept the fluid in the fluid tube; and an air discharge mechanism provided at the piston, by which the piston pushes the air introduced into the first cavity, and then discharges the air into outside, so that the pressing piece releases the fluid tube to allow the intercepted fluid to flow through the fluid tube. Since the pneumatic pinch valve is communicated with the air source via the air inlet port and controls the interception and release of fluid in the flow passage in a pneumatic manner, the construction of the pneumatic pinch valve is simple. Moreover, since the pressurized amount of the fluid tube or the pressure of the air source can be adjusted, i.e. adjusting the pinching force applied to the fluid tube, the fluid tube is not easily deteriorated during long-time operation.

Claims

1. A pneumatic pinch valve, comprising a lever and a pressing piece, a fluid tube receiving space being formed between the lever and the pressing piece, wherein the pneumatic pinch valve further comprises:

a main body providing a cavity therein, the lever being installed on the main body;

a piston provided in the cavity of the main body, the piston engaging with an inner wall of the cavity of the main body so as to divide the cavity into a first cavity and a second cavity, the pressing piece being positioned in the second cavity and supported on the piston;

an air inlet port provided at the first cavity, wherein air introduced into the first cavity via the air inlet port moves the piston toward the fluid tube receiving space, so as to press the fluid tube through an engagement of the pressing piece on the piston with the lever, and thus intercept the fluid in the fluid tube; and

an air discharge mechanism provided at the piston, by which the piston pushes the air introduced into the first cavity, and then discharges the air into outside, so that the pressing piece releases the fluid tube to allow the intercepted fluid to flow through the fluid tube.

2. The pneumatic pinch valve according to claim 1, wherein the main body comprises a cylinder body in which the cavity is provided and a gate element integrally secured to the cylinder body;

an opening communicated with the fluid tube receiving space is provided at a side of the gate element for installing the fluid tube;

the lever is provided at the gate element.

3. The pneumatic pinch valve according to claim 1, wherein the air discharge mechanism is a resilient element which is received in the second cavity of the main body and arranged around an outer wall of the piston, and two ends of the resilient element abut against an end of the second cavity and an end of the piston respectively.

4. The pneumatic pinch valve according to claim 2, wherein the air discharge mechanism is a resilient element which is received in the second cavity of the main body and arranged around an outer wall of the piston, and two ends of the resilient element abut against an end of the second cavity and an end of the piston respectively.

5. The pneumatic pinch valve according to claim 1, wherein the air discharge mechanism is an air intaking mechanism which is communicated with the second cavity, and air introduced into the second cavity via the air intaking mechanism pushes the piston so as to discharge the air in the first cavity.

6. The pneumatic pinch valve according to claim 2, wherein the air discharge mechanism is an air intaking mechanism which is communicated with the second cavity, and air introduced into the second cavity via the air intaking mechanism pushes the piston so as to discharge the air in the first cavity.

7. The pneumatic pinch valve according to claim 1, wherein an adjusting gasket is provided between the piston and the pressing piece so as to adjust a size of the fluid tube receiving space between the pressing piece and the lever.

8. The pneumatic pinch valve according to claim 3, wherein an adjusting gasket is provided between the piston and the pressing piece so as to adjust a size of the fluid tube receiving space between the pressing piece and the lever.

9. The pneumatic pinch valve according to claim 5, wherein an adjusting gasket is provided between the piston and the pressing piece so as to adjust a size of the receiving space for the fluid tube between the pressing piece and the lever.

10. The pneumatic pinch valve according to claim 1, wherein the lever is in a shape of cylinder.

11. The pneumatic pinch valve according to claim 1, wherein a sealing ring is provided between an outer wall of the piston and the inner wall of the cavity.