Vacuum pumping equipment for negative pressure valve

Abstract

The utility model relates to the technical field of vacuumizing, and particularly discloses a negative pressure valve vacuumizing device which comprises a container, a first pipeline, a negative pressure valve assembly, a first liquid monitoring mechanism, a second pipeline, an electromagnetic valve, a second liquid monitoring mechanism, a third pipeline and a vacuum pump which are sequentially communicated and connected in series. The first liquid monitoring mechanism and the second liquid monitoring mechanism are each internally provided with a humidity-dependent sensor used for detecting a liquid medium, the negative pressure valve assembly comprises a pipe body, and a blocking ring, a ball core and an elastic support are fixedly arranged in the pipe body. According to the technical scheme, the plugging ring is matched with the ball core and the spring, so that the negative pressure valve assembly is conducted in a self-adaptive mode when the vacuum pump vacuumizes container gas, when external gas flows back and reaches the interior of the negative pressure valve assembly, the ball core is tightly matched with the plugging ring to achieve backflow stopping, and the situation that external polluted gas enters a container due to gas backflow is avoided; and the purity of the container in the vacuumizing process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumping, in particular to a vacuum pumping device with a negative pressure valve. Background Art

[0002] Vacuuming can ensure that the pressure inside the pipeline system or container is lower than the pressure of the external environment, avoiding safety hazards caused by excessive pressure on the pipeline system or container. The vacuum pump is the main equipment used to extract gas and create a vacuum. There are many types of vacuum pumps, including rotary vane pumps, vortex pumps, Roots pumps, centrifugal pumps, etc. These pumps extract gas through different mechanisms and eventually discharge the gas out of the system, thereby reducing the gas pressure in the container. During the vacuuming process, it is easy for the liquid medium inside the container to enter the vacuuming equipment along the vacuuming pipeline, causing damage to the vacuuming equipment; there is backflow during the vacuuming process, and the internal pressure of the container is lower than the external pressure. The external gas or liquid medium is easy to flow back into the container, causing the container to be contaminated, which needs to be improved. Therefore, we propose a negative pressure valve vacuuming device. Utility Model Content

[0003] The purpose of the utility model is to provide a negative pressure valve vacuum pumping device to solve the problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a negative pressure valve vacuum equipment, comprising a container, a pipeline one, a negative pressure valve assembly, a liquid monitoring mechanism one, a pipeline two, a solenoid valve, a liquid monitoring mechanism two, a pipeline three and a vacuum pump which are connected in series in sequence, the liquid monitoring mechanism one and the liquid monitoring mechanism two are both provided with humidity sensors for detecting liquid media, a controller is provided on the outside of the solenoid valve, the negative pressure valve assembly comprises a tube body, a blocking ring, a ball core and an elastic support are fixedly provided inside the tube body, a hole seat is fixedly provided on the side of the ball core facing the elastic support, the hole seat is connected to the elastic support, and one end of the ball core is inlaid and connected with the blocking ring.

[0005] As a preferred implementation of the technical solution of the present application, the maximum diameter of the inner hole of the blocking ring is two-thirds of the diameter of the spherical core, and the minimum diameter of the inner hole of the blocking ring is one-third of the diameter of the spherical core.

[0006] As a preferred implementation of the technical solution of the present application, the elastic support includes a support, a support rod is arranged through the support, a spring is embedded in the middle of the support rod, and one end of the support rod is fixedly connected to the hole seat.

[0007] As a preferred implementation of the technical solution of the present application, pipeline 2 is a U-shaped pipeline, and the solenoid valve is installed in series at the midpoint of pipeline 2.

[0008] As a preferred implementation of the technical solution of the present application, liquid monitoring mechanism 1 is arranged at the inlet end of pipeline 2, and liquid monitoring mechanism 2 is arranged at the outlet end of pipeline 2.

[0009] As a preferred implementation of the technical solution of the present application, a pressure gauge is installed on the outside of the pipeline.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] 1. The technical solution of the present application uses a blocking ring in conjunction with a ball core and a spring, so that the negative pressure valve assembly is adaptively turned on when the vacuum pump evacuates the gas in the container. When external gas flows back and reaches the inside of the negative pressure valve assembly, the ball core and the blocking ring cooperate closely to cut off the backflow, thereby preventing the gas from flowing back and causing external contaminated gas to enter the container, thereby ensuring the purity of the container during the vacuum pumping process.

[0012] 2. The technical solution of the present application uses a liquid monitoring mechanism 1 to monitor whether the liquid inside the container is discharged during the vacuum pumping process, and a liquid monitoring mechanism 2 is used to monitor whether the external liquid medium enters the pipe 2 through backflow. When the liquid monitoring mechanism detects the liquid, the solenoid valve is closed in time through the controller, thereby solving the problem that the liquid in the container enters the vacuum pump during the vacuum pumping process, causing damage to the equipment, or the external liquid enters the container due to backflow and causes pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0014] Figure 1 It is a three-dimensional diagram of a negative pressure valve vacuum pumping device of the utility model;

[0015] Figure 2 It is a structural schematic diagram of a negative pressure valve assembly;

[0016] Figure 3 It is a schematic diagram of the structure of the ball core and the hole seat.

[0017] In the figure: 1. container; 2. pipeline one; 3. pressure gauge; 4. negative pressure valve assembly; 401. tube body; 402. support rod; 403. spring; 404. support; 405. blocking ring; 406. ball core; 407. hole seat; 408. through hole; 5. liquid monitoring mechanism one; 6. pipeline two; 7. solenoid valve; 8. controller; 9. liquid monitoring mechanism two; 10. pipeline three; 11. vacuum pump. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Embodiment 1, as Figure 1-3 As shown, the utility model provides a technical solution: a negative pressure valve vacuum pumping device, comprising a container 1, a pipeline 2, a negative pressure valve assembly 4, a liquid monitoring mechanism 1 5, a pipeline 2 6, a solenoid valve 7, a liquid monitoring mechanism 2 9, a pipeline 3 10 and a vacuum pump 11 which are connected in series in sequence, the liquid monitoring mechanism 1 5 and the liquid monitoring mechanism 2 9 are both provided with humidity sensors for detecting liquid media, the solenoid valve 7 is provided with a controller 8 on the outside, the negative pressure valve assembly 4 comprises a tube body 401, a blocking ring 405, a ball core 406 and an elastic support are fixedly provided inside the tube body 401, a hole seat 407 is fixedly provided on the side of the ball core 406 facing the elastic support, the hole seat 407 is connected to the elastic support, and one end of the ball core 406 is inlaid and connected with the blocking ring 405.

[0020] In a specific embodiment of the utility model, the position where the pipeline 2 and the container 1 are assembled is higher than the liquid level inside the container 1, so as to prevent the liquid from being directly ejected from the vacuum pump 11 through the pipeline during the vacuum process. The diameter of the hole seat 407 is 10 mm smaller than the inner diameter of the tube body 401, so as to prevent the hole seat 407 and the inner wall of the tube body 401 from friction damage. When the vacuum pump 11 is not started, the spring 403 presses the ball core 406 against the inner hole of the blocking ring 405, and the solenoid valve 7 is in an open state. The signal value of the humidity sensor when the controller 8 triggers the solenoid valve 7 to close is set, for example, when the humidity value reaches 90%, the control signal of the solenoid valve 7 to close is triggered. The internal humidity sensors of the liquid monitoring mechanism 1 5 and the liquid monitoring mechanism 2 9 are used to monitor moisture. The humidity sensor adopts a resistive humidity sensor. When moisture passes through the humidity sensor, the resistance change can be detected and the humidity value can be judged by the controller 8.

[0021] In the preferred technical solution, the maximum diameter of the inner hole of the blocking ring 405 is two-thirds of the diameter of the ball core 406, and the minimum diameter of the inner hole of the blocking ring 405 is one-third of the diameter of the ball core 406. The inner hole of the blocking ring 405 is arc-shaped, fitting closely with the spherical surface of the ball core 406, thereby improving the sealing performance of the blocking ring 405 and the ball core 406 when they cooperate.

[0022] In the preferred technical solution, the elastic support includes a support 404, a support rod 402 is set through the support 404, a spring 403 is embedded in the middle of the support rod 402, one end of the support rod 402 is fixedly connected to the hole seat 407, and the elastic support realizes the elastic adaptive movement of the ball core 406.

[0023] In the preferred technical solution, the liquid monitoring mechanism 15 is arranged at the inlet end of the pipeline 26, and the liquid monitoring mechanism 29 is arranged at the outlet end of the pipeline 26. The pipeline 26 is a U-shaped pipeline, and the U-shaped pipeline realizes gas buffering. The solenoid valve 7 is installed in series at the midpoint of the pipeline 26, which is conducive to giving the controller 8 signal processing and controlling the solenoid valve 7 to reserve reaction time.

[0024] In the preferred technical solution, a pressure gauge 3 is installed on the outside of pipeline 1-2, and pressure gauge 3 is used to monitor the pressure value of pipeline 1-2 in real time to ensure safety.

[0025] Working principle: The inside of the container 1 is evacuated by turning on the vacuum pump 11, and the gas passes through the pipeline 1 2, the negative pressure valve assembly 4, the body monitoring mechanism 1 5, the pipeline 2 6, the solenoid valve 7, the liquid monitoring mechanism 2 9, and the pipeline 3 10. During the vacuuming process, the ball core 406 is separated from the blocking ring 405, and the spring 403 is in a compressed state. When the vacuum pump 11 fails and the pipeline flows back, the backflowing airflow cooperates with the rebound of the spring 403 to make the ball core 406 and the blocking ring 405 close to each other, so that the backflowing gas cannot enter the container 1 through the negative pressure valve assembly 4. The liquid monitoring mechanism 1 5 monitors whether the liquid (moisture) inside the container 1 is discharged during the vacuuming process. The liquid monitoring mechanism 2 9 is used to monitor whether the external liquid (moisture) medium enters the pipeline 2 6 through the backflow. When the liquid monitoring mechanism detects the liquid (moisture), the solenoid valve 7 is closed in time through the controller 8, thereby solving the problem that the liquid in the container 1 enters the vacuum pump 11 during the vacuuming process, causing equipment damage, or the external liquid enters the container 1 due to the backflow, causing pollution.

Claims

1. A negative pressure valve vacuum pumping device, characterized in that: The invention comprises a container (1), a pipeline (2), a negative pressure valve assembly (4), a liquid monitoring mechanism (5), a pipeline (6), a solenoid valve (7), a liquid monitoring mechanism (9), a pipeline (10) and a vacuum pump (11) which are connected in series in sequence. The liquid monitoring mechanism (5) and the liquid monitoring mechanism (9) are both provided with humidity sensors for detecting liquid media. The solenoid valve (7) is provided with a controller (8) outside. The negative pressure valve assembly (4) comprises a tube body (401). A blocking ring (405), a ball core (406) and an elastic support are fixedly provided inside the tube body (401). A hole seat (407) is fixedly provided on one side of the ball core (406) facing the elastic support. The hole seat (407) is connected to the elastic support. One end of the ball core (406) is inlaid and connected to the blocking ring (405).

2. A negative pressure valve vacuum pumping device according to claim 1, characterized in that: The maximum diameter of the inner hole of the blocking ring (405) is two-thirds of the diameter of the spherical core (406), and the minimum diameter of the inner hole of the blocking ring (405) is one-third of the diameter of the spherical core (406).

3. The negative pressure valve vacuum pumping device according to claim 1, characterized in that: The elastic support comprises a support (404), a support rod (402) is provided through the support (404), a spring (403) is embedded in the middle of the support rod (402), and one end of the support rod (402) is fixedly connected to the hole seat (407).

4. The negative pressure valve vacuum pumping device according to claim 1, characterized in that: The second pipe (6) is a U-shaped pipe, and the solenoid valve (7) is installed in series at the midpoint of the second pipe (6).

5. A negative pressure valve vacuum pumping device according to claim 4, characterized in that: The liquid monitoring mechanism 1 (5) is arranged at the inlet end of the pipeline 2 (6), and the liquid monitoring mechanism 2 (9) is arranged at the outlet end of the pipeline 2 (6).

6. The negative pressure valve vacuum pumping device according to claim 1, characterized in that: The pipeline 1 (2) is connected to the outside and is equipped with a pressure gauge (3).

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