초록 ▼

A water-hammer proof and silent check valve comprises a shell (1), a spring (9), a flow guide body (10) and a cowl (11). The flow guide body (10) is provided with flow blocking boards (4, 6) which project from the outer surface of the flow guide body (10) and are capable of rotating around installat

A water-hammer proof and silent check valve comprises a shell (1), a spring (9), a flow guide body (10) and a cowl (11). The flow guide body (10) is provided with flow blocking boards (4, 6) which project from the outer surface of the flow guide body (10) and are capable of rotating around installation shafts (3, 7). A plurality of flow blocking boards are arranged in the flow passage in the axial direction of the valve, so that most part of pressure energy and kinetic energy are undertaken by the flow blocking boards by grading when liquid flows back to the valve, thus ensuring that the water hammer with large energy is divided into multiple water hammers with relatively smaller energy so as to greatly reduce the inner stress of valve bearing parts.

대표청구항 ▼

1. A water-hammer proof and silent check valve comprising a shell (1), a spring (9), a flow guide body (10) and a cowl (11), characterized in that the flow guide body (10) is provided with flow blocking boards (4, 6) which project from the outer surface of the flow guide body (10) and are capable of

1. A water-hammer proof and silent check valve comprising a shell (1), a spring (9), a flow guide body (10) and a cowl (11), characterized in that the flow guide body (10) is provided with flow blocking boards (4, 6) which project from the outer surface of the flow guide body (10) and are capable of rotating around flow blocking board installation shafts (3, 7). 2. The water-hammer proof and silent check valve as claimed in claim 1, wherein the flow blocking board installation shafts (3, 7) are disposed inside of the flow guide body (10), and the flow blocking boards (4, 6) project from the outer surface of the flow guide body (10) via flow blocking board bearing holes (102, 103) arranged on the flow guide body (10). 3. The water-hammer proof and silent check valve as claimed in claim 1, wherein the side of said each flow blocking board (4, 6) towards the water inlet of the check valve has a smooth arc transition, and the side towards the water outlet of the check valve is of a flat board structure. 4. The water-hammer proof and silent check valve as claimed in claim 3, wherein said each flow blocking board (4, 6) is formed by connecting two flat boards, an angle is formed between the connected flat boards, and its outer convex surfaces are towards the water inlet of the check valve and are provided with smooth arc transitions, and its inner concave surfaces are towards the water outlet of the check valve. 5. The water-hammer proof and silent check valve according as claimed in claim 4, wherein the angle formed by the flat boards is an acute angle of 20-45 degrees. 6. The water-hammer proof and silent check valve as claimed in claim 5, wherein the flow blocking board (4) comprises an installation body (41), an installation shaft hole (42), a rear wing plate (48), a front wing plate (49), a rear intermediate plate (45) and a front intermediate plate (46), wherein the rear wing plate (48) is parallel to the rear intermediate plate (45), the front intermediate plate (46) is perpendicular to the rear intermediate plate (45), the intersection angle between the front wing plate (49) and the rear wing plate (48) is an acute angle, the rear wing plate (48) comprises a rear upstream face (43) and a rear downstream face (471), the front wing plate (49) comprises a front upstream face (44) and a front downstream face (473), the front downstream face (473) and the rear downstream face (471) form a downstream face (47), and the downstream face (47) is connected with the rear wing plate (48) and the front wing plate (49) via an arc section (472). 7. The water-hammer proof and silent check valve as claimed in claim 6, wherein the main body of the flow blocking board installation body (41) is of a cylindrical body formed by two parallel planes which are perpendicular to the rear intermediate plate (45), the installation body (41) is provided with a shaft hole (42) parallel to the rear intermediate plate (45), and the front edge surface (411) of the installation body (41) is of a cylindrical surface. 8. The water-hammer proof and silent check valve as claimed in claim 1, wherein the flow guide body (10) comprises a core body (101) which is a streamline revolving body taking the axial line of the check valve as an axle center, the tail part of the core body is provided with an installation ring (104) supported by several support plates (1042), the cylindrical surface (1041) of the installation ring (104) is mounted on the shell (1), the core body (101) is further provided with a shaft hole (106) which is a blind hole, the axial line of the shaft hole coincides with the axial line of the core body (101), the wall surface of the core body (101) is provided with flow blocking board bearing holes (102, 103), the central lines of the flow blocking board bearing holes (102, 103) are positioned on the plane perpendicular to the axial line of the core body (101), the front end surface (105) of the core body (101) is a plane perpendicular to the axial line. 9. The water-hammer proof and silent check valve as claimed in claim 8, wherein the core body (101) is internally provided with flow blocking board installation bodies (5, 8), and the flow blocking boards (4, 6) are mounted on the flow blocking board installation bodies (5, 8) via the flow blocking board bearing holes (102, 103). 10. The water-hammer proof and silent check valve as claimed in claim 1, wherein the check valve comprises a shell (1), a sealing ring (2), a cowl (11), a flow guide body (10), flow blocking boards (4, 6), flow blocking board installation shafts (3, 7), a central shaft (12), a spring (9) and flow blocking board installation bodies (5, 8), wherein an installation ring (104) for the flow guide body (10) is mounted at the water outlet of the shell (1), the central shaft (12) is mounted in the shaft hole (106) of the flow guide body (10), the flow blocking board installation bodies (5, 8) are mounted inside the flow guide body (10) via the central shaft (12), the flow blocking boards (4, 6) penetrate through the flow blocking board bearing holes (102, 103) and mounted on the flow blocking board installation bodies (5, 8) via the flow blocking board installation shafts (3, 7), the cowl (11) is mounted on the central shaft (12) via a shaft sleeve (114) and corresponds to the front end surface (105) of the flow guide body (10), the spring (9) is arranged between the shaft sleeve (114) and the central shaft (12), and the sealing surface (113) of the cowl (11) corresponds to the sealing ring (2) disposed at the water inlet of the shell (1).