High-sensitivity micro-flow check valve

Abstract

The high-sensitivity micro-flow check valve comprises a valve body, a valve seat and a valve cover, an installation cylinder is installed at the lower end of the valve cover, a valve clack is elastically connected in the installation cylinder through a spring, and a first driving mechanism used for driving the valve clack to move is arranged at the lower end of the valve cover. The first driving mechanism comprises two first electric push rods fixedly connected to the lower end of the valve deck, push plates are arranged at the output ends of the first electric push rods, and a controller is installed at the upper end of the valve deck through an installation disc. The first driving mechanism is arranged, the state of the check valve can be dynamically adjusted according to the actual pressure change through the pressure compensation function, the sensitivity of the check valve to micro flow is improved, and therefore the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a high-sensitivity, low-flow check valve. Background Technology

[0002] A check valve is a type of valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow. Check valves are commonly used as foot valves in water pumping systems to prevent water backflow. When used in combination with a gate valve, a check valve can provide safety isolation. Its disadvantages include high resistance and poor sealing when closed.

[0003] Lift check valves are a type of automatic valve. They typically use elastic elements to lift and lower the valve disc. This design is less suitable for certain special situations, such as the lack of monitoring of small flow rates. When the inlet pressure is low or there are pressure fluctuations, the valve disc may not fit tightly against the valve seat, leading to leakage. To solve the above problems, we have proposed this highly sensitive small flow check valve. Utility Model Content

[0004] The main purpose of this invention is to provide a highly sensitive check valve for small flow rates, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-sensitivity, low-flow check valve includes a valve body, a valve seat, and a valve cover. An mounting cylinder is installed at the lower end of the valve cover, and a valve disc is elastically connected to the mounting cylinder via a spring. A first driving mechanism for moving the valve disc is provided at the lower end of the valve cover. The first driving mechanism includes two first electric push rods fixedly connected to the lower end of the valve cover, with push plates at the output ends of the first electric push rods. A controller is mounted on the upper end of the valve cover via a mounting plate. Two pressure sensors are provided at the upper end of the valve body, and a second driving mechanism for moving the valve disc is provided at the lower end of the valve body.

[0007] Preferably, the second drive mechanism includes a fixed cylinder disposed at the lower end of the valve body, a connecting plate at the lower end of the fixed cylinder, a second electric push rod at the upper end of the connecting plate, and a fixed plate at the output end of the second electric push rod.

[0008] Preferably, the upper end of the push plate is provided with a first bellows, and the upper end of the first bellows is fixedly connected to the lower end of the valve cover.

[0009] Preferably, the lower end of the fixed plate is provided with a second corrugated pipe, and the lower end of the second corrugated pipe is connected to the upper end of the connecting plate.

[0010] Preferably, the upper end of the mounting plate is provided with a plurality of first bolts, and the plurality of first bolts are arranged at equal intervals.

[0011] Preferably, the connecting plate is provided with a plurality of second bolts, and the second bolts are provided with nuts.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This device is equipped with a first drive mechanism, which can dynamically adjust the state of the check valve according to the actual pressure changes through the pressure compensation function, thereby improving its sensitivity to small flow rates and thus improving the practicality of the device.

[0014] 2. This device is equipped with a second drive mechanism, which can quickly drive the valve disc to overcome resistance and open by activating the second electric push rod, greatly shortening the valve opening time and thus improving the practicality of the device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-sensitivity micro-flow check valve proposed in this utility model;

[0016] Figure 2 This is a side view of the high-sensitivity micro-flow check valve proposed in this utility model;

[0017] Figure 3 This is another side view of the high-sensitivity micro-flow check valve proposed in this utility model.

[0018] In the diagram: 1 Valve body, 2 Valve seat, 3 Valve cover, 4 Controller, 5 Pressure sensor, 6 Mounting plate, 7 First electric push rod, 8 Mounting cylinder, 9 Push plate, 10 Valve disc, 11 First bellows, 12 Fixed cylinder, 13 Connecting plate, 14 Second electric push rod, 15 Fixed plate, 16 Second bellows. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] like Figure 1-3 As shown, the high-sensitivity micro-flow check valve includes a valve body 1, a valve seat 2, and a valve cover 3. An installation cylinder 8 is installed at the lower end of the valve cover 3. A valve disc 10 is elastically connected inside the installation cylinder 8 via a spring. A first driving mechanism for driving the valve disc 10 to move is provided at the lower end of the valve cover 3. The first driving mechanism includes two first electric push rods 7 fixedly connected to the lower end of the valve cover 3. A push plate 9 is provided at the output end of the first electric push rods 7. A controller 4 is installed at the upper end of the valve cover 3 via an installation plate 6. Two pressure sensors 5 are provided at the upper end of the valve body 1.

[0021] The valve body 1 is provided with a second driving mechanism for driving the valve disc 10 to move. The second driving mechanism includes a fixed cylinder 12 located at the lower end of the valve body 1, a connecting plate 13 located at the lower end of the fixed cylinder 12, a second electric push rod 14 located at the upper end of the connecting plate 13, and a fixed plate 15 located at the output end of the second electric push rod 14.

[0022] In this utility model, the upper end of the push plate 9 is provided with a first bellows 11, the upper end of the first bellows 11 is fixedly connected to the lower end of the valve cover 3, and the first bellows 11 can protect the first electric push rod 7 and improve its service life.

[0023] In this utility model, a second corrugated pipe 16 is provided at the lower end of the fixed plate 15. The lower end of the second corrugated pipe 16 is connected to the upper end of the connecting plate 13. The second corrugated pipe 16 can protect the second electric push rod 14 and improve its service life.

[0024] In this utility model, the upper end of the mounting plate 6 is provided with multiple first bolts, which are equally spaced, so that the controller 4 can be disassembled individually for easy individual maintenance.

[0025] In this utility model, the connecting plate 13 is provided with a plurality of second bolts, and the second bolts are provided with nuts, so that the connecting plate 13 can be disassembled, making it convenient to replace and maintain the second electric push rod 14 separately.

[0026] It should be noted that this utility model is a high-sensitivity micro-flow check valve. The user connects it to the liquid pipeline with screws and nuts, and installs pressure sensors 5 upstream and downstream of the check valve to monitor the pressure changes in the pipeline in real time. For example, a high-precision piezoresistive pressure sensor can be used, which can accurately measure micro-pressure changes with an accuracy of several Pascals. When a sudden drop in upstream pressure is detected, which may lead to reverse flow, the controller 4 can activate the first electric push rod 7. The output end of the first electric push rod 7 extends, and the two push plates 9 quickly push the valve disc 10 down, so that the valve disc 10 can be closed more tightly to prevent micro-reverse flow from passing through. This pressure compensation function can dynamically adjust the state of the check valve according to the actual pressure changes, thereby improving its sensitivity to micro-flow.

[0027] Alternatively, by activating the second electric actuator 14, the valve disc 10 can be quickly driven to overcome resistance and open through powerful output, greatly shortening the valve opening time. For example, in fire protection systems, valves need to be able to open quickly in order to quickly inject water into the fire protection network or to quickly drain water from the water supply and drainage system. This design can quickly open the valve disc 10, allowing water to pass through the butterfly valve rapidly. Taking the fire protection system as an example, when a fire occurs, after the fire pump starts, the actuator can quickly open the valve disc 10 of the butterfly valve, allowing fire water to be injected into the fire protection network at the fastest speed, ensuring that fire fighting can be carried out in a timely manner.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high sensitivity micro flow check valve comprising a valve body (1), a valve seat (2) and a valve cover (3), characterized in that, The lower end of the valve cover (3) is provided with a mounting cylinder (8), a valve clack (10) is elastically connected in the mounting cylinder (8) through a spring, the lower end of the valve cover (3) is provided with a first driving mechanism for driving the valve clack (10) to move, the first driving mechanism comprises two first electric push rods (7) fixedly connected to the lower end of the valve cover (3), the output end of the first electric push rod (7) is provided with a push plate (9), the upper end of the valve cover (3) is provided with a controller (4) through a mounting disc (6), the upper end of the valve body (1) is provided with two pressure sensors (5), and the lower end of the valve body (1) is provided with a second driving mechanism for driving the valve clack (10) to move.

2. The high sensitivity micro flow check valve according to claim 1, wherein, The second driving mechanism comprises a fixed cylinder (12) arranged at the lower end of the valve body (1), the lower end of the fixed cylinder (12) is provided with a connecting disc (13), the upper end of the connecting disc (13) is provided with a second electric push rod (14), and the output end of the second electric push rod (14) is provided with a fixed disc (15).

3. The high sensitivity micro flow check valve of claim 2, wherein, The upper end of the push plate (9) is provided with a first bellows (11), and the upper end of the first bellows (11) is fixedly connected with the lower end of the valve cover (3).

4. The high sensitivity micro flow check valve of claim 3, wherein, The lower end of the fixed disc (15) is provided with a second bellows (16), and the lower end of the second bellows (16) is connected with the upper end of the connecting disc (13).

5. The high sensitivity micro flow check valve of claim 4, wherein, The upper end of the mounting disc (6) is provided with a plurality of first bolts, and the first bolts are arranged at equal intervals.

6. The high sensitivity micro flow check valve of claim 5, wherein, The connecting disc (13) is provided with a plurality of second bolts, and the second bolts are provided with nuts.

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