Composite drainage check valve for water conservancy engineering slope

Abstract

The utility model discloses a compound drainage check valve for water conservancy engineering side slope, be applied to the side slope in water conservancy engineering, including the check valve with the valve plug and the valve cover, and the check valve includes the main check valve 1 of bigger opening pressure, and the top of main valve bonnet 1.1 and main valve valve frame 1.8 are formed the valve plug of main check valve 1 through main valve sealing ring 1.2, still be provided with the low water head of opening, the small drainage capacity, the vice check valve 2 that is engraved with the main check valve 1 opening water head early warning liquid level line on main check valve 1's main valve bonnet 1.1, and vice valve bonnet 2.2 are transparent material, the utility model discloses can directly observe the working condition of check valve and how many and siltation condition of the water level gathered in the valve, can be convenient daily routine inspection and overhaul, and also can discharge the underground water to river, water channel or reservoir in time in the season of smaller underground water, effectively reduce the water head and stock of high underground water.

Description

Technical Field

[0001] This utility model relates to a check valve, and more particularly to a check valve used in water conservancy projects for discharging groundwater. Background Technology

[0002] Check valves are widely used in water conservancy projects such as the bottom and slopes of rivers and canals, and road revetments. The function of a check valve is to drain groundwater from beneath the concrete or plastic sheeting impermeable base layer of the water conservancy project into the river or canal or to the outside of the revetment, while preventing outside water from entering the ground (below the impermeable base layer). Currently, there are many types of check valve structures, but they all have a valve body with a support. Inside the valve body is a piston or valve plug for sealing the outlet, and a valve cover is located on top of the valve body. When the groundwater pressure is high enough to reach the check valve's set pressure value, the piston and valve cover open, and groundwater flows out of the check valve. When the groundwater pressure does not reach the check valve's opening pressure value, or when the water pressure in the canal or river is greater than or equal to the groundwater pressure, the piston and valve cover return to their original positions, the check valve closes, and outside water cannot enter the ground (below the impermeable base layer) through the check valve.

[0003] Groundwater volume varies depending on the season (high or low) and date. Groundwater inevitably contains minerals, silt, and other impurities. Check valves can age or become clogged with scale formed from groundwater minerals, sometimes preventing them from opening or closing. This can cause check valve malfunction, leading to water leakage from rivers and canals into the ground, or groundwater accumulation. This can cause the water table below the waterproofing layer to rise, resulting in excessive soil moisture and potential landslides. Alternatively, the inability to drain groundwater can exert significant lifting force on the waterproofing layer, causing damage. Therefore, regular inspection of check valves by maintenance personnel is necessary.

[0004] However, when inspecting check valves, operators and maintenance personnel cannot directly observe the opening or closing status of the check valve piston, nor can they directly operate the check valve to open or close, and cannot measure data such as the check valve's opening pressure. This brings great difficulties to fault diagnosis, emergency response, and daily inspection, and is not conducive to monitoring the drainage capacity of the check valve. Especially during critical periods such as heavy rain and flood drainage, the unknown status may lead to serious consequences.

[0005] Furthermore, in different water conservancy projects or different locations, the size, drainage capacity, and drainage opening pressure of check valves vary. When using a larger check valve, it may not open under low water pressure, leading to water accumulation within the valve body and hindering valve maintenance. Prolonged accumulation of groundwater beneath the impermeable base layer can also cause the underlying soil to soften excessively, losing its supporting force and potentially resulting in landslides or collapse of the impermeable base layer. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a check valve that can directly observe the working status of the check valve and the water level accumulated inside the check valve, so as to facilitate daily inspection and maintenance work, and can also discharge groundwater into rivers, canals or reservoirs in a timely manner during seasons when the groundwater volume is low.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A composite drainage check valve for use on slopes in water conservancy projects includes a check valve with a valve plug and a valve cover. The check valve includes a main check valve with a high opening pressure. The valve cover of the main valve and the top of the main valve frame are connected by a main valve sealing ring to form the valve plug of the main check valve. A secondary check valve with a low opening head and small drainage volume is also provided on the valve cover of the main check valve. The valve cover of the secondary valve is made of transparent material.

[0008] A further improvement of the present invention is that: both the main check valve and the auxiliary check valve include a valve cover, a valve frame, a sealing ring that forms a seal between the valve frame and the valve cover, a guide rod that guides the movement of the valve cover, and a spring that tightens the valve cover and a nut that adjusts the spring pressure, both mounted on the guide rod.

[0009] A further improvement of this utility model is that the auxiliary check valve is located at a preset position vertically downward from the center of the main valve cover; the auxiliary valve holder of the auxiliary check valve passes through the main valve cover so that the water inlet end of the auxiliary check valve is located inside the main check valve, and the auxiliary valve cover of the auxiliary check valve is located on the outer surface of the main valve cover.

[0010] A further improvement of this utility model is that: one end of the auxiliary valve guide rod of the auxiliary check valve is integrated with the auxiliary valve cover, and the other end of the auxiliary valve guide rod passes through the guide hole in the center of the auxiliary valve frame and then a secondary valve spring and an auxiliary valve spring nut for adjusting the pressure of the auxiliary valve spring are sleeved on the auxiliary valve guide rod; the auxiliary valve sealing ring of the auxiliary check valve is set on the auxiliary valve cover or auxiliary valve frame at the contact part between the auxiliary valve cover and the auxiliary valve frame.

[0011] A further improvement of this utility model is that: one end of the main valve guide rod of the main check valve is connected to the main valve cover through a universal ball joint; a guide rod support bearing that slides with the main valve guide rod is provided in the main valve frame of the main check valve; and a main valve spring and a main valve pressure adjusting nut for adjusting the pressure of the main valve spring are sleeved on the other end of the main valve guide rod.

[0012] A further improvement of this utility model is that a main valve spring protective cover, which is connected to the main valve frame and protects the main valve spring and the main valve pressure adjusting nut, is sleeved on the inner end of the main valve guide rod.

[0013] A further improvement of this utility model is that the main valve sealing ring of the main check valve is set at the top of the main valve frame and at the corresponding position of the main valve cover.

[0014] A further improvement of this utility model is that: the secondary valve cover is provided with a marker line to display the water level height inside the main check valve.

[0015] A further improvement of the present invention is that the marking lines include: a secondary valve opening marking line located at the bottom corresponding to the opening head position of the secondary check valve; a main valve opening marking line located in the middle corresponding to the opening head position of the main check valve and also serving as a fault warning position for the secondary check valve not opening; and a main valve not opening fault marking line located at the top corresponding to a fault warning position for the main check valve not opening.

[0016] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows: This invention incorporates a secondary check valve on the cover of the main check valve. When the water level inside the check valve is low, and the thrust of the groundwater is insufficient to open the heavy main check valve, the lightweight secondary check valve can open. This ensures smooth drainage even when groundwater levels are low, preventing long-term water accumulation near the check valve and guaranteeing drainage functionality under low water level and low flow conditions. Furthermore, this invention not only enables the check valve to open even during dry seasons with low water volumes, promptly draining groundwater and eliminating the problem of water accumulation beneath the impermeable base layer of the slope, but the composite structure formed by the main and secondary check valves also effectively removes silt or other debris that may enter the main check valve. When the main check valve contains water with sediment or impurities, the secondary check valve opens first. The water with sediment or impurities flows out of the secondary check valve at high speed. This water flow continuously flushes the inside of the main check valve, washing away any impurities that may be stuck. This effectively prevents and alleviates the problem of check valve jamming, significantly reducing the probability of the main check valve getting stuck at the source. It also reduces the problem of long-term immersion of various parts of the main check valve in water, where the oxidation of minerals in groundwater easily produces sulfate ion scale, affecting the flexibility of moving parts and causing jamming. The composite structure of the main and secondary check valves in this invention allows for the modification of existing main check valves at extremely low cost. Only a mounting hole needs to be machined on the main check valve and a small secondary check valve needs to be installed. This solution does not require large-scale modifications to the existing valve body, is simple to implement, and offers significant economic benefits.

[0017] This invention features a transparent cover for the auxiliary check valve, allowing inspectors to directly observe the internal structure and operation of the main check valve, as well as any obstructions or other issues. The real-time visual monitoring of the check valve's internal status provides clear visibility into safety and its operational status, making the valve's operation immediately apparent. This direct and reliable monitoring reduces inspection time, eliminates the need for expensive electronic sensors, and lowers costs and maintenance complexity. The low, medium, and high water level markers in this invention serve as warnings regarding the operational status of both the main and auxiliary check valves. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a side sectional view of an embodiment of the present utility model; Figure 4 This is a simplified structural diagram of the secondary valve according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the auxiliary check valve of this utility model when it is open; Figure 6 A schematic diagram showing the opening of both the main check valve and the auxiliary check valve when the water volume is large. Among them, 1. Main check valve, 1.1. Main valve cover, 1.2. Main valve sealing ring, 1.3 Main valve guide rod, 1.4 Main valve spring, 1.5 Main valve spring protective cover, 1.6. Main valve pressure adjusting nut, 1.7 Guide rod support bearing, 1.8. Main valve frame, 1.9. Main valve mounting flange, 1.10. Lower ring of the frame; 2. Secondary check valve; 2.1. Marking line; 2.2. Secondary valve cover; 2.3. Secondary valve support; 2.4. Secondary valve guide rod; 2.5. Secondary valve spring; 2.6. Secondary valve spring nut; 2.7. Secondary valve sealing ring; 211. Secondary valve opening marking line; 212. Main valve opening marking line; 213. Main valve not opening fault marking line. Detailed Implementation

[0019] This utility model discloses a composite drainage check valve, which can be installed on the slope of a water conservancy project to drain groundwater seeping from the high slope surrounding the project and into the concrete or other impermeable base layer. Under normal circumstances, these drainage check valves are located on the slope above the water surface within the water conservancy project. This utility model includes a large check valve and a small check valve (which can be referred to as the main check valve and the auxiliary check valve). The main check valve has a larger opening pressure and a larger drainage capacity, while the auxiliary check valve has a smaller opening pressure and a smaller drainage capacity. The auxiliary check valve is installed on the valve cover of the main check valve. Both the main check valve 1 and the auxiliary check valve 2 include a valve frame, a valve plug, and a valve cover. The valve plug of the main check valve 1 is formed by the main valve sealing ring 1.2 installed at the top of the main valve frame 1.8 cooperating with the main valve cover 1.1 to seal or open the main check valve 1. The main valve sealing ring 1.2 is located at the top of the main valve frame 1.8 and contacts the main valve cover 1.1 of the main check valve 1. The main valve cover 1.1 is a part that forms a seal for the check valve. When the main valve cover 1.1 is pulled inward, the cover contacts and presses against the main valve sealing ring 1.2, preventing groundwater from draining. When the groundwater pressure is high enough, the cover is pushed open, the check valve opens, and water is drained outward.

[0020] The auxiliary check valve 2 is installed on the main valve cover 1.1 of the main check valve 1. The auxiliary check valve 2 has a smaller drainage capacity and a lower opening pressure. When installing this utility model in water conservancy projects, the auxiliary check valve 2 is generally positioned below the center of the main check valve 1. The center of the auxiliary check valve 2 and the center of the main check valve 1 are on the same vertical line. The distance between the center of the auxiliary check valve 2 and the center of the main check valve 1 is calculated and set in advance according to the technical requirements of the check valve. When there is groundwater in the main check valve 1 that cannot be discharged, the auxiliary check valve 2 opens first to drain a small amount of water.

[0021] The auxiliary check valve 2 of this utility model can have the same or similar structure as the main check valve 1, and also includes a secondary valve holder 2.3, a secondary valve sealing ring 2.7 installed on the top of the secondary valve holder 2.3, and a secondary valve cover 2.2; of course, it can also adopt a structure different from that of the main check valve 1. A preferred embodiment of this utility model is to design the main check valve 1 and the auxiliary check valve 2 with similar structures: that is, both the main check valve 1 and the auxiliary check valve 2 include a valve cover, a valve holder, a sealing ring that forms a seal between the valve holder and the valve cover, a guide rod that guides the movement of the valve cover, and a spring that tightens the valve cover and a nut that adjusts the spring pressure, all provided on the guide rod.

[0022] The main check valve 1 of this utility model can be designed with the following structure: one end (top) of the main valve guide rod 1.3 is connected to the main valve cover 1.1 via a universal ball joint. This design is to ensure that when the main check valve 1 drains a large amount of water and the main valve cover 1.1 is opened to a large height, the main valve guide rod 1.3 and the main valve cover 1.1 are movably connected, and the opening of the cover will not affect the movement of the main valve guide rod 1.3. A guide rod support bearing 1.7 is provided in the main valve frame 1.8 of the main check valve 1 to cooperate with the sliding of the main valve guide rod 1.3. One set of this guide rod support bearing 1.7 can be set at each of the upper and lower ends of the main valve frame 1.8 to achieve good support for the main valve guide rod 1.3. Good guidance and support; a main valve spring 1.4 for tightening the main valve cover 1.1 is sleeved at the other end of the main valve guide rod 1.3 (outside the lower set of guide rod support bearings 1.7), and a main valve adjusting nut 1.6 for adjusting the pressure of the main valve spring 1.4 is set at the end of the main valve guide rod 1.3 outside the main valve spring 1.4; while the main valve sealing ring 1.2 of the main check valve 1 is set at the top of the main valve frame 1.8, and the main valve sealing ring 1.2 corresponds to the main valve cover 1.1. When the main valve spring 1.4 tightens the main valve cover 1.1, the main valve cover 1.1 presses on the main valve sealing ring 1.2 or fits inside the main valve sealing ring 1.2, so that the main check valve 1 is closed. Of course, the main valve sealing ring 1.2 can also be set on the inner surface of the main valve cover 1.1. When the main valve spring 1.4 tightens the main valve cover 1.1, the main valve sealing ring 1.2 on the main valve cover 1.1 presses against the inner ring of the main valve mounting flange 1.9 on the upper part of the main valve bracket 1.8, thus forming a seal between the valve cover and the bracket, which can reduce the weight of the valve cover. The top cover of the main check valve is connected to the universal joint of the guide rod, which evenly distributes the rebound force of the guide rod spring, allowing the force on the valve cover and the sealing ring to be freely distributed, and can closely combine with the sealing ring on the bracket to achieve the effect of uniform force and tight sealing.

[0023] The auxiliary check valve 2 of this utility model can be manufactured with the same structure as the main check valve 1 described above. In this embodiment, the auxiliary check valve 2 has a similar structure to the main check valve 1, but the structure has been simplified. In this embodiment, one end (top or outer end) of the auxiliary valve guide rod 2.4 of the auxiliary check valve 2 is integrally connected to the auxiliary valve cover 2.2. That is, in this embodiment, the auxiliary valve guide rod 2.4 and the auxiliary valve cover 2.2 are die-cast into one piece during manufacturing. In this utility model, the other end of the auxiliary valve guide rod 2.4 passes through the guide hole in the center of the auxiliary valve frame 2.3, and then the auxiliary valve spring 2.5 is sleeved on the auxiliary valve guide rod 2.4. Then, the auxiliary valve spring nut 2.6 for adjusting the pressure of the auxiliary valve spring 2.5 is screwed in. The auxiliary valve sealing ring 2.7 of the auxiliary check valve 2 can be set on the auxiliary valve cover 2.2, or it can be set at the corresponding position of the auxiliary valve frame 2.3 and the auxiliary valve cover 2.2. When the auxiliary valve cover 2.2 is pulled in by the spring, the valve cover and the sealing ring cooperate to form a blockage of groundwater.

[0024] The auxiliary check valve 2 can be mounted on the main check valve 1's cover using snap-fit, threaded connection, or screws. When assembling the auxiliary check valve 2 onto the main check valve 1's cover, the auxiliary valve bracket 2.3 of the auxiliary check valve 2 passes through the main valve cover 1.1, so that the inlet end of the auxiliary check valve 2 is located inside the main check valve 1, while the auxiliary valve cover 2.2 of the auxiliary check valve 2 is located on the outer surface of the main valve cover 1.1. Thus, when the water level in the main check valve 1 reaches a certain height, the auxiliary check valve 2 will open first to drain the water.

[0025] The auxiliary valve cover 2.2 in this invention is made of transparent material, allowing maintenance personnel to observe the water level and flow rate within the check valve. Furthermore, marking lines 2.1 can be provided on the transparent auxiliary valve cover 2.2. These marking lines 2.1 not only indicate the water level in the main check valve 1 but also serve as indicators of the check valve's flexibility and proper functioning. Therefore, these marking lines 2.1 can be designed as three lines located at the bottom, middle, and top. The bottom marking line is the auxiliary valve opening marking line 211, corresponding to the water head position (water level) when the auxiliary check valve 2 is normally open. When the water head in the main check valve 1 reaches the auxiliary valve opening marking line 211 as observed through the transparent top cover, the auxiliary check valve 2 should be normally open and enter the drainage working state. Otherwise, it indicates that the auxiliary check valve may be stuck, and the auxiliary check valve 2 should be inspected. The middle marker line is the main valve opening marker line 212. This marker line corresponds to the water head position when the main check valve 1 is normally open. The main valve opening marker line 212 also serves as a warning of the failure position of the auxiliary check valve 2. When the water head in the main check valve 1 reaches this marker line, both the main check valve 1 and the auxiliary check valve 2 should be open normally. If the auxiliary check valve 2 is not open, it indicates that the auxiliary check valve 2 has become stuck. If the main check valve 1 is not open, the main valve cover 1.1 of the main check valve 1 should be actively checked and pushed and pulled to observe the condition of the main check valve 1 and recorded. If no water is discharged from either the auxiliary check valve or the main check valve, it may indicate that the auxiliary check valve is stuck and the main check valve may also be inflexible. The upper marker line is the main valve not opening fault marker line 213. This marker line corresponds to the fault warning position of the main check valve 1 not opening. When the water head reaches or exceeds the main valve not opening fault marker line 213, the drainage volume of the auxiliary check valve 2 should increase significantly, and the main check valve 1 should be in the open drainage state. If the water head in the main check valve 1 reaches or exceeds this marker line, and the main check valve 1 still does not open or drain normally, it indicates that the main check valve 1 is stuck. The main valve cover 1.1 should be actively pushed and pulled to check the stuck condition of the main check valve 1. If the main check valve 1 still cannot drain normally after pushing and pulling the valve cover, it must be removed and repaired to restore its function. If the water level in the main check valve is higher than the main valve not opening fault marker line 213, but no water is discharged from the auxiliary check valve or the main check valve, the entire check valve must be inspected and repaired. If the water level in the check valve does not reach the lower marker line, it indicates that the groundwater volume is small. In this case, the valve cover can be manually pulled to check its flexibility.

[0026] For example, the main check valve of a certain specification produced according to this utility model has an opening pressure of about 20cm for the water level. The middle mark line is located at the position where the water level in the main check valve is 20cm. The auxiliary check valve has an opening pressure of about 2cm. The bottom mark line is located at the position where the water level in the main check valve is 2cm, which is also the opening mark line of the auxiliary check valve. The top mark line is the warning line. When the water level in the check valve reaches or exceeds the warning line, the top alarm line corresponds to the main check valve fault indication line. If the water level reaches this line and the check valve still does not drain water, it indicates that both the main and auxiliary check valves are faulty.

[0027] This utility model can also provide a main valve spring protective cover 1.5 on the inner end of the main valve guide rod 1.3 of the main check valve 1, the outside of the main valve spring 1.4 and the main valve pressure adjusting nut 1.6, to protect the spring and nut from being stuck by underground mud and sand. The main valve spring protective cover 1.5 can be connected to the bottom of the valve frame lower ring 1.10 of the main valve frame 1.8 (also called the outer edge) to prevent the main valve spring 1.4 and the main valve pressure adjusting nut 1.6 from directly contacting the mud and sand.

[0028] The main valve frame 1.8 and the auxiliary valve frame 2.3 of this utility model are both hollow frames, allowing groundwater to seep into the valve cover and sealing ring; and the center of the valve frame is provided with a space or hole through which the main valve guide rod 1.3 or the auxiliary valve guide rod 2.4 passes or supports.

Claims

1. A composite drainage check valve for use on slopes in water conservancy projects, comprising a check valve with a valve plug and a valve cover, characterized in that: The check valve includes a main check valve (1) with a large opening pressure. The main valve cover (1.1) of the main check valve (1) and the top of the main valve frame (1.8) form a valve plug of the main check valve (1) through the main valve sealing ring (1.2). A secondary check valve (2) with a low opening head and small drainage volume is also provided on the main valve cover (1.1) of the main check valve (1). The secondary valve cover (2.2) is made of transparent material.

2. A composite drainage check valve for use on slopes in water conservancy projects according to claim 1, characterized in that: Both the main check valve (1) and the auxiliary check valve (2) include a valve cover, a valve frame, a sealing ring that forms a seal between the valve frame and the valve cover, a guide rod that guides the movement of the valve cover, a spring that tightens the valve cover and a nut that adjusts the spring pressure, all mounted on the guide rod.

3. A composite drainage check valve for use on slopes in water conservancy projects according to any one of claims 1 or 2, characterized in that: The secondary check valve (2) is located at a preset position vertically downward at the center of the main valve cover (1.1); the secondary valve holder (2.3) of the secondary check valve (2) passes through the main valve cover (1.1) so that the water inlet end of the secondary check valve (2) is located inside the main check valve (1) and the secondary valve cover (2.2) of the secondary check valve (2) is located on the outer surface of the main valve cover (1.1).

4. A composite drainage check valve for use on slopes in water conservancy projects according to any one of claims 1 or 2, characterized in that: One end of the auxiliary valve guide rod (2.4) of the auxiliary check valve (2) is connected to the auxiliary valve cover (2.2) as a whole. The other end of the auxiliary valve guide rod (2.4) passes through the guide hole in the center of the auxiliary valve frame (2.3) and then a auxiliary valve spring (2.5) and an auxiliary valve spring nut (2.6) for adjusting the pressure of the auxiliary valve spring (2.5) are sleeved on the auxiliary valve guide rod (2.4). The auxiliary valve sealing ring (2.7) of the auxiliary check valve (2) is set on the auxiliary valve cover (2.2) or the auxiliary valve frame (2.3) at the contact part between the auxiliary valve cover (2.2) and the auxiliary valve frame (2.3).

5. A composite drainage check valve for use on slopes in water conservancy projects according to any one of claims 1 or 2, characterized in that: One end of the main valve guide rod (1.3) of the main check valve (1) is connected to the main valve cover (1.1) through a universal ball joint. A guide rod support bearing (1.7) that slides with the main valve guide rod (1.3) is provided in the main valve frame (1.8) of the main check valve (1). The other end of the main valve guide rod (1.3) is fitted with a main valve spring (1.4) and a main valve adjusting nut (1.6) that adjusts the pressure of the main valve spring (1.4).

6. A composite drainage check valve for use on slopes in water conservancy projects according to claim 5, characterized in that: A protective spring (1.4) and a pressure adjusting nut for the main valve are fitted inside the main valve guide rod (1.3) and connected to the main valve holder (1.8). 1.6) Main valve spring protection cover (1.5).

7. A composite drainage check valve for use on slopes in water conservancy projects according to claim 5, characterized in that: The main valve sealing ring (1.2) of the main check valve (1) is located at the top of the main valve frame (1.8) and at the corresponding position of the main valve cover (1.1).

8. A composite drainage check valve for use on slopes in water conservancy projects according to claim 1, characterized in that: The secondary valve cover (2.2) is provided with a marker line (2.1) to display the water level in the main check valve (1).

9. A composite drainage check valve for use on slopes in water conservancy projects according to claim 8, characterized in that: The marking lines (2.1) include the auxiliary valve opening marking line (211) located below corresponding to the opening head position of the auxiliary check valve (2), the main valve opening marking line (212) located in the middle corresponding to the opening head position of the main check valve (1) and also serving as the fault warning position for the auxiliary check valve (2) not opening, and the main valve not opening fault marking line (213) located above corresponding to the fault warning position for the main check valve (1) not opening.

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