CN105840888A - Dry-wet separation type check valve for hydraulic tunnel engineering - Google Patents

Abstract

The invention discloses a dry-wet separation check valve for hydraulic tunnel engineering, and relates to a check valve for hydraulic tunnel engineering. It includes a valve body, a piston and an end cover. The top of the end cover is connected to the bottom of the valve body. The water flow channel includes a first drain hole and a second drain hole. The valve body is equipped with a piston installation hole and a water flow channel. Three drainage holes and bosses. The upper end of the piston is located in the first drainage hole and can block the water inlet of the second drainage hole. The lower end of the piston is located in the piston installation hole and forms a shoulder limit with the piston installation hole. The lower end of the piston is in contact with the piston installation hole. A spring is installed between the bosses. The invention solves the problem of affecting the service life of the check valve due to corrosion, sediment blockage, and soluble salt precipitation in the hydraulic tunnel engineering environment, and separates the water flow channel in the check valve from the working mechanism inside the check valve. And it can keep the spring dry, thus enhancing the durability of the check valve.

Description

Dry and wet separation check valve for hydraulic tunnel engineering

technical field

The invention relates to a check valve for hydraulic tunnel engineering, in particular to a dry-wet separation type check valve for hydraulic tunnel engineering.

Background technique

In hydraulic tunnel engineering, in order to reduce the water pressure in the surrounding rock, drainage holes are usually drilled in the surrounding rock to drain groundwater. A check valve is installed to limit that groundwater can only flow into the tunnel from the surrounding rock, but not from the tunnel into the surrounding rock mass.

Although existing check valves have multiple structural forms (such as lifting check valves and swing check valves, etc.), the internal working mechanism (the mechanism that makes the piston move up and down) of the existing check valve is not the same as Water separation in the water flow channel.

Since the water in the surrounding rock is often mixed with corrosive salts and a large amount of sediment, and soluble salts are easily precipitated in the groundwater, when people apply the existing check valves to the hydraulic tunnel environment, the existing check valves Corrosion and clogging often occur when working in a hydraulic tunnel environment, which will affect the service life of the check valve and even cause the check valve to lose its function. If the check valve loses its function or fails to work normally, the water in the surrounding rock will not be drained normally, which will cause the water pressure in the surrounding rock to be too high, resulting in the rupture of the surrounding rock, which will seriously threaten the stability of the tunnel.

Contents of the invention

The object of the present invention is to provide a dry-wet separation check valve for hydraulic tunnel engineering in order to overcome the disadvantages of the background technology.

In order to achieve the above object, the technical solution of the present invention is: a dry-wet separation check valve for hydraulic tunnel engineering, including a valve body and a piston, the valve body is equipped with a piston installation hole located at the lower end of the valve body, and the valve body can The water flow channel connecting the top and the bottom of the valve body is characterized in that it also includes an end cover, the top of the end cover is connected with the bottom of the valve body, the water flow channel includes a first drain hole connected to the top of the valve body, and a first drain hole connected to the first drain hole connected to the second drain hole connected to the bottom of the valve body, a third drain hole communicating with the second drain hole, and a boss located in the piston installation hole are installed on the end cover, and the upper end of the piston is located at the second drain hole. The water inlet of the second drainage hole can be blocked in the first drainage hole. The lower end of the piston is located in the piston installation hole and forms a shoulder limit with the piston installation hole. The spring in the hole, the first sealing ring is installed between the upper end of the piston and the side wall of the first drain hole, the second sealing ring is installed between the lower end of the piston and the side wall of the piston mounting hole, and the boss and the piston mounting hole A third sealing ring is installed between the side walls.

In the above technical solution, the first drainage hole is arranged vertically, and the first drainage hole, the piston installation hole and the boss are arranged coaxially.

In the above technical solution, the diameter of the upper end of the piston is the same as that of the first drainage hole, the diameter of the lower end of the piston is the same as that of the piston installation hole, and the diameter of the boss is the same as that of the piston installation hole.

In the above technical solution, the second drain hole includes a second horizontal drain hole and a second vertical drain hole, the second vertical drain hole is vertically arranged, and one end of the second horizontal drain hole communicates with the first drain hole, The other end communicates with the second vertical drainage hole, the third drainage hole is coaxial with the second vertical drainage hole, and the diameters of the second horizontal drainage hole, the second vertical drainage hole and the third drainage hole are the same.

In the above technical solution, the boss and the end cover are of an integral structure.

The invention has a simple and reasonable structure, is easy to manufacture, and solves the problems in the hydraulic tunnel engineering environment that affect the durability of the check valve due to corrosion, sediment blockage, and precipitation of soluble salts. The working mechanism inside the valve is separated, and the dryness of the spring can be kept, thereby enhancing the durability of the check valve.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a sectional view along line A-A of Fig. 1 .

In the figure, 11-first sealing ring, 12-second sealing ring, 13-third sealing ring, 2-piston, 3-water flow channel, 41-first drain hole, 42-second drain hole, 421-second Horizontal drainage hole, 422-the second vertical drainage hole, 43-the third drainage hole, 5-end cover, 6-boss, 7-spring, 8-piston mounting hole, 9-valve body.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples. At the same time, the advantages of the present invention are clearer and easier to understand through the description.

Referring to the accompanying drawings, it can be seen that the dry-wet separation check valve for hydraulic tunnel engineering is characterized in that it includes a valve body 9, a piston 2 and an end cover 5, the top of the end cover 5 is connected to the bottom of the valve body 9, and the valve body 9 is installed There is a piston installation hole 8 located at the lower end of the valve body 9, and a water flow channel 3 that can communicate the top of the valve body 9 with the bottom of the valve body 9, and the water flow channel 3 includes a first drainage hole 41 connected to the top of the valve body 9, and The second drain hole 42 communicated with the first drain hole 41 and connected to the bottom of the valve body 9, the third drain hole 43 communicated with the second drain hole 42 is installed on the end cover 5, and is located in the piston mounting hole. The boss 6 in 8, the upper end of the piston 2 is located in the first drain hole 41 and can block the water inlet of the second drain hole 42, the lower end of the piston 2 is located in the piston mounting hole 8 and is connected with the piston mounting hole 8 forms a shaft shoulder limit, a spring 7 located in the piston installation hole 8 is installed between the lower end of the piston 2 and the boss 6, and a first sealing ring 11 is installed between the upper end of the piston 2 and the side wall of the first drainage hole 41 ), a second sealing ring 12 is installed between the lower end of the piston 2 and the side wall of the piston mounting hole 8, and a third sealing ring 13 is installed between the boss 6 and the side wall of the piston mounting hole 8.

The first drainage hole 41 is arranged vertically, and the first drainage hole 41 , the piston mounting hole 8 and the boss 6 are coaxially arranged. The diameter of the upper end of the piston 2 is the same as that of the first drainage hole 41 , the diameter of the lower end of the piston 2 is the same as that of the piston mounting hole 8 , and the diameter of the boss 6 is the same as that of the piston mounting hole 8 .

The second drainage hole 42 includes a second horizontal drainage hole 421 and a second vertical drainage hole 422, the second vertical drainage hole 422 is vertically arranged, and one end of the second horizontal drainage hole 421 communicates with the first drainage hole 41, The other end communicates with the second vertical drain hole 422, the third drain hole 43 is coaxial with the second vertical drain hole 422, the diameter of the second horizontal drain hole 421, the second vertical drain hole 422 and the third drain hole 43 same.

Preferably, the boss 6 and the end cover 5 are integrally structured.

Dry-wet separation method of the present invention comprises following construction steps,

Step 1: When there is water flow in the first drainage hole 41, and the pressure of the water flow on the upper end of the piston 2 is greater than the thrust of the spring 7 on the bottom end of the piston 2, the piston 2 moves downward under the action of the pressure;

Step 2: When the piston 2 moves down to the bottom of the second horizontal drainage hole, the first drainage hole 41 and the second drainage hole 42 are connected, and the water flow channel 3 is in a connected state at this time, and the water flow in the first drainage hole 41 can flow from The top of the valve body 9 flows into the bottom of the valve body 9, thereby realizing the drainage function of the check valve;

Step 3: When there is no water flow in the first drainage hole 41, or the pressure of the water flow in the first drainage hole 41 on the upper end of the piston 2 is less than the thrust of the spring 7 on the bottom end of the piston 2, the piston 2 moves upward under the action of the thrust;

Step 4: When the piston 2 moves upward to the top of the second horizontal drainage hole 421, the upper end of the piston 2 blocks the water inlet of the second drainage hole 42, and the water flow channel 3 is in a closed state at this time, and the water flow in the third drainage hole 43 Or the water flow at the lower end of the end cover 5 cannot flow from the bottom end of the valve body 9 to the top end of the valve body 9, thereby realizing the one-way flow function of the check valve.

Due to the separation of the water flow channel 3 and the spring 7, the corrosive substances, sediment and precipitated soluble salts contained in the water will not be in contact with the spring 7, which can ensure that the spring 7 is not corroded or blocked, thereby improving the check valve. service life.

Other unspecified parts belong to the prior art.

Claims (6)

1. Dry-wet separation check valve for hydraulic tunnel engineering, including a valve body (9) and a piston (2), the valve body (9) is equipped with a piston installation hole (8) at the lower end of the valve body (9), And the water flow channel (3) that can make the top of the valve body (9) communicate with the bottom of the valve body (9), it is characterized in that: it also includes an end cover (5), and the top of the end cover (5) is connected with the bottom of the valve body (9) , the water flow channel (3) includes a first drain hole (41) connected to the top of the valve body (9), and a second drain hole connected to the first drain hole (41) and connected to the bottom of the valve body (9) (42), the third drain hole (43) communicating with the second drain hole (42) is installed on the end cover (5), and the boss (6) located in the piston mounting hole (8), The upper end of the piston (2) is located in the first drain hole (41) and can block the water inlet of the second drain hole (42), and the lower end of the piston (2) is located in the piston mounting hole (8) and is connected with The piston mounting hole (8) forms a shaft shoulder limit, and a spring (7) located in the piston mounting hole (8) is installed between the lower end of the piston (2) and the boss (6). A first sealing ring (11) is installed between the side walls of a drainage hole (41), and a second sealing ring (12) is installed between the lower end of the piston (2) and the side wall of the piston mounting hole (8). A third sealing ring (13) is installed between (6) and the side wall of the piston mounting hole (8). 2. The dry-wet separation check valve for hydraulic tunnel engineering according to claim 1, characterized in that: the first drain hole (41) is vertically arranged, and the first drain hole (41), the piston The mounting hole (8) and the boss (6) are coaxially arranged. 3. The dry-wet separation check valve for hydraulic tunnel engineering according to claim 2, characterized in that: the diameter of the upper end of the piston (2) is the same as the diameter of the first drainage hole (41), and the piston (2) ) The diameter of the lower end is identical with the diameter of the piston mounting hole (8), and the diameter of the boss (6) is identical with the diameter of the piston mounting hole (8). 4. The dry-wet separation check valve for hydraulic tunnel engineering according to any one of claims 1 to 3, characterized in that: the second drain hole (42) includes a second transverse drain hole ( 421) and the second vertical drain hole (422), the second vertical drain hole (422) is arranged vertically, one end of the second horizontal drain hole (421) communicates with the first drain hole (41), and the other end communicates with the first drain hole (41). Two vertical drain holes (422) are connected, the third drain hole (43) is coaxial with the second vertical drain hole (422), the second horizontal drain hole (421), the second vertical drain hole (422) and the second vertical drain hole (422) The diameters of the three drainage holes (43) are identical. 5. The dry-wet separation check valve for hydraulic tunnel engineering according to claim 4, characterized in that: the boss (6) and the end cover (5) are of an integrated structure. 6. The dry-wet separation check valve for hydraulic tunnel engineering according to any one of claims 1 to 3, characterized in that: the boss (6) and the end cover (5) are integrated structure.