Novel vacuum gauge capable of overpressure protection

Abstract

The utility model relates to the technical field of vacuum gauges, and discloses a novel vacuum gauge capable of overpressure protection, which comprises a vacuum gauge, the bottom surface of the vacuum gauge is fixedly communicated with an air inlet cylinder, and a protection mechanism is arranged in the air inlet cylinder; the protection mechanism comprises a fixed plate, the outer surface of the fixed plate is fixedly connected with the inner wall of the air inlet cylinder, a contact switch is arranged above the fixed plate, two limiting plates are fixedly connected to the inner wall of the air inlet cylinder, through holes are formed in the upper surfaces of the two limiting plates, and a movable plate is arranged between the two limiting plates. The upper surface of the movable plate is fixedly connected with two guide rods, and the two guide rods are slidably connected to the interior of the fixed plate. According to the novel vacuum gauge capable of overpressure protection, when the overpressure problem occurs due to overhigh pressure, airflow with relatively high pressure can push the movable plate to seal the through hole, so that overpressure gas is prevented from entering the vacuum gauge through the gas inlet cylinder, and the effect of preliminarily preventing the overpressure gas from damaging a diaphragm for pressure detection in the vacuum gauge is achieved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum gauge technology, specifically a novel vacuum gauge with overpressure protection. Background Technology

[0002] Based on the different physical mechanisms utilized in the measurement principle of vacuum gauges, they can be divided into three main categories: vacuum gauges that utilize mechanical properties, those that utilize gas dynamics effects, and those that utilize charged particle effects. In scientific research and industrial production, in order to ensure the stability of the vacuum environment pressure value, vacuum gauges are usually needed to detect the vacuum pressure value, so that staff can make timely adjustments to the equipment based on changes in the pressure value.

[0003] The existing utility model with authorization announcement number CN216669112U discloses a digital vacuum gauge, including a vacuum gauge body, a filter screen installed at the bottom of the filter plate, a cleaning component threadedly connected to the lower outer periphery of the filter, a pull rod inserted into the right side of the cleaning component, a cleaning block fixed to the left end of the pull rod, and a cleaning brush installed on the upper surface of the cleaning block.

[0004] The above technical solution uses an added cleaning brush to clean the dust on the filter screen. The cleaned dust falls onto the surface of the dust collection plate. When the dust collection plate touches the inner wall of the pouring chamber, the tilt angle increases, causing the dust on the surface of the dust collection plate to fall into the pouring chamber. At the same time, the spring will press down on the right side of the dust collection plate, causing the dust collection plate to reset and store the fallen dust again, ensuring the smooth flow of the device's pipeline. However, the above technical solution does not provide good overpressure protection for the vacuum gauge during use. Because the vacuum gauge's vacuum pressure detection range is limited, when the pressure value exceeds the maximum value that the vacuum gauge can measure, it is very easy to cause excessive damage to the diaphragm used for internal pressure detection, causing the vacuum gauge to become unusable and greatly affecting the self-protection effect of the vacuum gauge.

[0005] Therefore, those skilled in the art have provided a novel vacuum gauge with overpressure protection to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a novel vacuum gauge with overpressure protection to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A novel vacuum gauge with overpressure protection includes a vacuum gauge, wherein an air inlet cylinder is fixedly connected to the bottom surface of the vacuum gauge, and a protection mechanism is provided inside the air inlet cylinder.

[0009] The protective mechanism includes a fixed plate, the outer surface of which is fixedly connected to the inner wall of the air inlet cylinder. A contact switch is provided above the fixed plate. Two limiting plates are fixedly connected to the inner wall of the air inlet cylinder. Each of the two limiting plates has a through hole on its upper surface. A movable plate is provided between the two limiting plates. Two guide rods are fixedly connected to the upper surface of the movable plate. Both guide rods are slidably connected inside the fixed plate and inside one of the limiting plates. A push plate is fixedly connected to the top of both guide rods. The bottom surface of the push plate is in contact with the upper surface of the fixed plate. A sealing seat is fixedly connected to the inner wall of the air inlet cylinder. A connecting plate is fixedly connected to the inner wall of the air inlet cylinder. A conical plug is provided above the connecting plate. Two sealing rings are fixedly connected to the outer surface of the conical plug. An electric push rod is fixedly connected to the upper surface of the connecting plate. The telescopic end of the electric push rod is fixedly connected to the inner top wall of the conical plug. The electric push rod is electrically connected to the contact switch via a wire.

[0010] As a further improvement of this utility model: the upper surface of the vacuum gauge is fixedly connected to an interface, and the outer surface of the air inlet cylinder is fixedly connected to a snap-fit ​​seat.

[0011] As a further embodiment of this utility model: the upper surface of the fixing plate is fixedly connected to a limiting seat, and the upper surface of the contact switch is fixedly connected to the inner top wall of the limiting seat.

[0012] As a further improvement of this utility model: a reinforcing ring is fixedly connected to the upper surface of the sealing seat, and the outer surface of the reinforcing ring is fixedly connected to the inner wall of the air inlet cylinder.

[0013] As a further improvement of this utility model: the bottom surface of the connecting plate is fixedly connected to two reinforcing ribs, and the sides of the two reinforcing ribs that are far apart from each other are fixedly connected to the inner wall of the air inlet cylinder.

[0014] As a further embodiment of this utility model: an auxiliary spring is sleeved on the outer surface of the electric push rod, the top end of the auxiliary spring is fixedly connected to the inner top wall of the conical plug, and the bottom end of the auxiliary spring is fixedly connected to the upper surface of the connecting plate.

[0015] As a further improvement of this utility model, the bottom surface of the conical plug is fixedly connected to two sliding rods, both of which are slidably connected inside the connecting plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention incorporates a protective mechanism. A movable plate allows gas to pass smoothly through the gap between the limiting plate and the movable plate, entering the vacuum gauge through the through-hole for vacuum pressure detection. Simultaneously, when excessive pressure occurs, the high-pressure airflow pushes the movable plate to seal the through-hole, preventing overpressure gas from entering the vacuum gauge through the inlet cylinder. This initially prevents damage to the pressure-detecting diaphragm inside the vacuum gauge from overpressure gas. Furthermore, a push plate, in conjunction with a guide rod, activates a contact switch. This switch controls an electric push rod to move a conical plug upwards, which, together with a sealing ring, seals the inlet on the sealing seat, further preventing overpressure gas from entering the vacuum gauge. This design provides excellent overpressure protection, reduces damage caused by overpressure gas, and improves the vacuum gauge's self-protection effect and service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a new type of vacuum gauge with overpressure protection;

[0019] Figure 2 A cross-sectional three-dimensional structural diagram of the air inlet cylinder in a novel vacuum gauge with overpressure protection;

[0020] Figure 3 A cross-sectional three-dimensional structural diagram of the movable plate in a novel vacuum gauge with overpressure protection;

[0021] Figure 4 This is a cross-sectional three-dimensional structural diagram of the sealed base in a novel vacuum gauge with overpressure protection.

[0022] In the diagram: 1. Vacuum gauge; 2. Air inlet cylinder; 3. Protection mechanism; 301. Fixing plate; 302. Contact switch; 303. Limiting plate; 304. Through hole; 305. Movable plate; 306. Guide rod; 307. Push plate; 309. Sealing seat; 310. Connecting plate; 311. Electric push rod; 312. Conical plug; 313. Sealing ring; 4. Interface; 5. Snap-fit ​​seat; 6. Limiting seat; 7. Reinforcing ring; 8. Reinforcing rib; 9. Auxiliary spring; 10. Sliding rod. Detailed Implementation

[0023] Please see Figure 1-4 A novel vacuum gauge with overpressure protection includes a vacuum gauge 1, an air inlet cylinder 2 fixedly connected to the bottom surface of the vacuum gauge 1, a protection mechanism 3 inside the air inlet cylinder 2, an interface 4 fixedly connected to the upper surface of the vacuum gauge 1, and a snap-fit ​​seat 5 fixedly connected to the outer surface of the air inlet cylinder 2. The interface 4 allows the vacuum gauge 1 to be easily connected to an external control system, and the snap-fit ​​seat 5 allows the air inlet cylinder 2 to be connected to the device under test, ensuring the normal installation of the air inlet cylinder 2.

[0024] The protection mechanism 3 includes a fixing plate 301. The outer surface of the fixing plate 301 is fixedly connected to the inner wall of the air inlet cylinder 2. A contact switch 302 is provided above the fixing plate 301. Two limiting plates 303 are fixedly connected to the inner wall of the air inlet cylinder 2. The upper surface of the two limiting plates 303 is provided with through holes 304. A limiting seat 6 is fixedly connected to the upper surface of the fixing plate 301. The upper surface of the contact switch 302 is fixedly connected to the inner top wall of the limiting seat 6. The limiting seat 6 can limit the position of the contact switch 302 to ensure that the contact switch 302 can be smoothly activated.

[0025] A movable plate 305 is provided between the two limiting plates 303. Two guide rods 306 are fixedly connected to the upper surface of the movable plate 305. Both guide rods 306 are slidably connected inside the fixed plate 301. Both guide rods 306 are slidably connected inside one of the limiting plates 303. A push plate 307 is fixedly connected to the top of the two guide rods 306. The bottom surface of the push plate 307 is in contact with the upper surface of the fixed plate 301. A sealing seat 309 is fixedly connected to the inner wall of the air inlet cylinder 2. A reinforcing ring 7 is fixedly connected to the upper surface of the sealing seat 309. The outer surface of the reinforcing ring 7 is fixedly connected to the inner wall of the air inlet cylinder 2. The reinforcing ring 7 can increase the connection between the sealing seat 309 and the air inlet cylinder 2, making it less likely for the sealing seat 309 to loosen from the air inlet cylinder 2.

[0026] A connecting plate 310 is fixedly connected to the inner wall of the air intake cylinder 2. A conical plug 312 is provided above the connecting plate 310. Two reinforcing ribs 8 are fixedly connected to the bottom surface of the connecting plate 310. The two reinforcing ribs 8 are fixedly connected to the inner wall of the air intake cylinder 2 on the side that is far away from each other. The reinforcing ribs 8 can improve the structural strength of the connecting plate 310, making the connecting plate 310 less prone to deformation during use and increasing the pressure resistance of the connecting plate 310.

[0027] Two sealing rings 313 are fixedly connected to the outer surface of the conical plug 312. An electric push rod 311 is fixedly connected to the upper surface of the connecting plate 310. The telescopic end of the electric push rod 311 is fixedly connected to the inner top wall of the conical plug 312. The electric push rod 311 is electrically connected to the contact switch 302 through a wire. An auxiliary spring 9 is sleeved on the outer surface of the electric push rod 311. The top end of the auxiliary spring 9 is fixedly connected to the inner top wall of the conical plug 312, and the bottom end of the auxiliary spring 9 is fixedly connected to the upper surface of the connecting plate 310. The auxiliary spring 9 can assist the electric push rod 311 in resetting, increasing the resetting response speed of the electric push rod 311.

[0028] Two sliding rods 10 are fixedly connected to the bottom surface of the conical plug 312. Both sliding rods 10 are slidably connected inside the connecting plate 310. The sliding rods 10 slide inside the connecting plate 310, which can increase the stability of the conical plug 312 moving up and down and ensure the reliability of the movement of the conical plug 312.

[0029] The working principle of this utility model is as follows: In use, the vacuum gauge 1, contact switch 302, and electric push rod 311 are first connected to an external power supply and controller through interface 4. When the pressure of gas within the normal range of the vacuum gauge 1 is detected, the gas can pass through the gap between the limiting plate 303 and the movable plate 305, and then enter the vacuum gauge 1 through the air inlet cylinder 2 via the through hole 304 for vacuum pressure detection. When the gas pressure exceeds the limit, the overpressure gas will push the movable plate 305 upward through the through hole 304 of the lower limiting plate 303, blocking the through hole 304 on the upper limiting plate 303, preventing the overpressure gas from entering the vacuum gauge 1 through the air inlet cylinder 2, and preventing the overpressure gas from damaging the pressure detection diaphragm inside the vacuum gauge 1. When the movable plate 305 moves upward, it will push the push plate 307 upward through the guide rod 306. The push plate 307 contacts the contact switch 302. At this time, the contact switch 302 can start the electric push rod 311 to move through the wire. With the help of the connecting plate 310, the conical plug 312 moves upward with the assistance of the sliding rod 10 until the conical plug 312 and the sealing ring 313 block the air inlet of the sealing seat 309. This further prevents overpressure gas from entering the vacuum gauge 1, giving the vacuum gauge 1 a good overpressure protection function, reducing the damage caused by overpressure gas to the vacuum gauge 1, and improving the self-protection effect and service life of the vacuum gauge 1. Finally, when the overpressure gas no longer enters the air inlet cylinder 2, the movable plate 305 will move downward due to gravity until the push plate 307 contacts the upper surface of the fixed plate 301 through the guide rod 306. At this time, the movable plate 305 will return to the position between the two limit plates 303 to complete the reset.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel vacuum gauge with overpressure protection, comprising a vacuum gauge (1), characterized in that: The bottom surface of the vacuum gauge (1) is fixedly connected to an air inlet cylinder (2), and a protective mechanism (3) is provided inside the air inlet cylinder (2); The protective mechanism (3) includes a fixed plate (301), the outer surface of which is fixedly connected to the inner wall of the air inlet cylinder (2). A contact switch (302) is provided above the fixed plate (301). Two limiting plates (303) are fixedly connected to the inner wall of the air inlet cylinder (2). The upper surfaces of the two limiting plates (303) are provided with through holes (304). A movable plate (305) is provided between the two limiting plates (303). Two guide rods (306) are fixedly connected to the upper surface of the movable plate (305). The two guide rods (306) are slidably connected inside the fixed plate (301) and slidably connected inside one of the limiting plates (303). A push plate (307) is fixedly connected to the top of the guide rod (306). The bottom surface of the push plate (307) is in contact with the upper surface of the fixed plate (301). A sealing seat (309) is fixedly connected to the inner wall of the air inlet cylinder (2). A connecting plate (310) is fixedly connected to the inner wall of the air inlet cylinder (2). A conical plug (312) is provided above the connecting plate (310). Two sealing rings (313) are fixedly connected to the outer surface of the conical plug (312). An electric push rod (311) is fixedly connected to the upper surface of the connecting plate (310). The telescopic end of the electric push rod (311) is fixedly connected to the inner top wall of the conical plug (312). The electric push rod (311) is electrically connected to the contact switch (302) through a wire.

2. The novel vacuum gauge with overpressure protection according to claim 1, characterized in that: The upper surface of the vacuum gauge (1) is fixedly connected to an interface (4), and the outer surface of the air inlet cylinder (2) is fixedly connected to a snap-fit ​​seat (5).

3. The novel vacuum gauge with overpressure protection according to claim 1, characterized in that: The upper surface of the fixing plate (301) is fixedly connected to the limiting seat (6), and the upper surface of the contact switch (302) is fixedly connected to the inner top wall of the limiting seat (6).

4. A novel vacuum gauge with overpressure protection according to claim 1, characterized in that: A reinforcing ring (7) is fixedly connected to the upper surface of the sealing seat (309), and the outer surface of the reinforcing ring (7) is fixedly connected to the inner wall of the air inlet cylinder (2).

5. A novel vacuum gauge with overpressure protection according to claim 1, characterized in that: The bottom surface of the connecting plate (310) is fixedly connected to two reinforcing ribs (8), and the two reinforcing ribs (8) are fixedly connected to the inner wall of the air inlet cylinder (2) on the side that is far apart from each other.

6. A novel vacuum gauge with overpressure protection according to claim 1, characterized in that: An auxiliary spring (9) is fitted on the outer surface of the electric push rod (311). The top end of the auxiliary spring (9) is fixedly connected to the inner top wall of the conical plug (312), and the bottom end of the auxiliary spring (9) is fixedly connected to the upper surface of the connecting plate (310).

7. A novel vacuum gauge with overpressure protection according to claim 1, characterized in that: The bottom surface of the conical plug (312) is fixedly connected to two sliding rods (10), and both sliding rods (10) are slidably connected inside the connecting plate (310).

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