Adjustable pneumatic sensor

Abstract

The utility model discloses an adjustable pneumatic sensor, and solves the problems that the precision of the conventional pneumatic sensor is insufficient and the action value is difficult to adjust under a micro-pressure condition. The high-pressure gas valve comprises an upper shell and a lower shell, a high-pressure signal detection port is formed in the lower end of the upper shell, a signal amplification device is arranged between the upper shell and the lower shell, an airflow channel capable of adjusting the vertical position is formed in the lower shell, and a valve element capable of vertically sliding is arranged above the signal amplification device. The valve element slides upwards to make contact with the airflow channel to form a structure for closing the airflow channel. The pneumatic micro-pressure control valve has the advantages that the pneumatic transmission characteristic is adopted, the pneumatic micro-pressure control valve is particularly suitable for the potential explosion danger and the strong electromagnetic interference environment, the action value is precisely adjusted by adjusting the adjusting rod, the circumferential adjusting angle of the adjusting rod and the action value are in a linear proportional relation, and the action value of the pneumatic micro-pressure control valve can be precisely reset.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to an adjustable pneumatic sensor. Background Art

[0002] The positive pressure protection system must be configured with one or more automatic safety devices to trigger actions when the positive pressure value inside the positive pressure enclosure drops below the minimum value specified by the manufacturer; in the positive pressure enclosures and their pipelines where leakage may occur, the minimum positive pressure values that each part should maintain relative to the external pressure are: 50 Pa for protection grades "pxb" or "pyb", and 25 Pa for protection grade "pzc".

[0003] The existing positive pressure protection systems mainly adopt the following two methods: one is to use an electronic sensor in combination with a solenoid valve as an automatic safety device, but this method is easily affected by electromagnetic interference, difficult to meet the explosion-proof requirements, and requires additional power supply; the other is to use a pneumatic sensor in combination with pneumatic logic elements, but the pneumatic sensor has insufficient accuracy under micro-pressure conditions (such as 25 Pa and 50 Pa), and the action value is difficult to adjust, thus increasing the use and maintenance costs of the positive pressure protection system. Content of the Utility Model

[0004] In view of the above situation, to overcome the defects of the prior art, the utility model provides an adjustable pneumatic sensor, which solves the problems of insufficient accuracy of the existing pneumatic sensor under micro-pressure conditions and difficult adjustment of the action value.

[0005] The utility model solves the technical problems through the following technical means. An adjustable pneumatic sensor includes an upper housing and a lower housing. A high-pressure signal detection port is arranged at the lower end of the upper housing. A signal amplification device is arranged between the upper housing and the lower housing. An air flow channel with an adjustable vertical position is arranged inside the lower housing. A valve core that can slide vertically is arranged above the signal amplification device. When the valve core slides upward, it contacts the air flow channel to form a structure for closing the air flow channel.

[0006] Preferably, the air flow channel includes a hollow adjusting rod. The upper end of the adjusting rod is of a sealed structure. The valve core is in extrusion contact with the upper end of the adjusting rod to form a structure for sealing the air flow channel.

[0007] Preferably, an air inlet is fixed at the upper end of the lower housing. An exhaust hole is arranged on the adjusting rod. The exhaust hole is communicated with the inside of the adjusting rod. The gas in the air inlet enters the adjusting rod through the exhaust hole.

[0008] Preferably, two sealing rings are sleeved on the outer circumference of the adjusting rod. The two sealing rings are located on the upper and lower sides of the exhaust hole. The two sealing rings are in contact with the lower housing to form a structure for sealing the inner channel of the lower housing.

[0009] Preferably, the lower shell is also provided with an air outlet, and the air outlet can be communicated with the air inlet through an air flow channel.

[0010] Preferably, the signal amplifying device comprises a silicone rubber sheet, which is fixed at the connection between the upper shell and the lower shell, and the lower end of the valve core is in contact with the silicone rubber sheet.

[0011] Preferably, a filler core is fixed in the lower shell body, the upper end of the valve core can slide through the filler core and is located above the filler core, a spring is mounted on the valve core, the lower end of the spring is fixedly connected to the valve core, and the upper end of the spring is fixedly connected to the filler core, and the spring is a structure that drives the valve core to slide downward.

[0012] Preferably, the upper end of the adjusting rod is threadedly connected to the upper end of the lower shell body.

[0013] Preferably, a circular hole is provided at the upper end of the lower shell, a circular disc is fixed at the upper end of the adjusting rod, a gap is provided between the inner wall of the circular hole and the circular disc, a damper is slidably provided at the upper end of the lower shell, and the damper is placed in the circular hole and contacts the circular disc.

[0014] Preferably, the disc is provided with a scale.

[0015] The utility model has the following beneficial effects: 1) It adopts pneumatic transmission characteristics, which is particularly suitable for potential explosion hazards and strong electromagnetic interference environments; 2) The action value is precisely adjusted by adjusting the adjustment rod, and the circumferential adjustment angle of the adjustment rod is in linear proportion to the action value, so that the action value of the pneumatic micro-pressure control valve can be accurately reset; 3) Through such adjustment, the design can effectively deal with air pressure fluctuations caused by factors such as increased leakage or temperature changes caused by long-term operation in the casing of positive pressure electrical equipment, thereby significantly reducing maintenance and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model after being cut open (the upper shell, the lower shell and the cassia rubber sheet are cut open);

[0019] Figure 3 This is a schematic diagram of the structure of the utility model after being cut open (the cinnamon rubber sheet is not cut open);

[0020] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0021] Figure 5 For Figure 3 Schematic diagram of the enlarged structure of part B in

[0022] In the figure: 1. Upper shell; 2. Lower shell; 3. High-pressure signal detection port; 4. Valve core; 5. Bush; 6. Adjusting rod; 7. Air inlet; 8. Exhaust hole; 9. Sealing ring; 10. Silicone rubber sheet; 11. Air outlet; 12. Spring; 13. Disc. Specific implementation manner

[0023] The following combines the attached Figures 1-5 Further detailed description will be given to the specific implementation manner of the present utility model.

[0024] As Figures 1-5 shown, an adjustable pneumatic sensor includes an upper shell 1 and a lower shell 2. A high-pressure signal detection port 3 is provided at the lower end of the upper shell 1. A signal amplification device is provided between the upper shell 1 and the lower shell 2. An air flow channel with adjustable vertical position is provided inside the lower shell 2. Above the signal amplification device, there is a valve core 4 that can slide vertically. When the valve core 4 slides upward and contacts the air flow channel, a structure for closing the air flow channel is formed.

[0025] In this device, the high-pressure signal detection port 3 at the central position of the upper shell 1 is connected to the pressure detection point inside the shell of the electrical equipment to be detected. The detected pressure gas signal is amplified by the signal amplification device, and the valve core 4 is pushed to move upward. The valve core 4 moves up and down to contact the air flow channel, thereby sealing the air flow channel. In this way, the air intake entering the lower shell 2 from the outside cannot be discharged, so as to ensure consistent pressure, and thus control the operation of the pneumatic logic element.

[0026] The vertical position of the air flow channel in this device can be adjusted. According to the different positions of the air flow channel, the effective operating distance of the valve core 4 is different, thereby determining the maximum pressure value, and the adjustment is convenient.

[0027] The air flow channel includes a hollow adjusting rod 6. The upper end of the adjusting rod 6 is a sealed structure. The valve core 4 is in pressing contact with the upper end of the adjusting rod 6 to form a structure for sealing the air flow channel.

[0028] In this device, the upper end of the adjusting rod 6 is in a sealed state and the lower end is hollow, thus forming a gas flow channel. When the valve core 4 slides upward and presses against the adjusting rod 6, the valve core 4 blocks the hole at the lower end of the adjusting rod 6. At this time, the gas flow channel is blocked and the air flow cannot pass through.

[0029] An air inlet 7 is fixed at the upper end of the lower shell 2. An exhaust hole 8 is provided on the adjusting rod 6. The exhaust hole 8 is communicated with the inside of the adjusting rod 6. The gas in the air inlet 7 enters the adjusting rod 6 through the exhaust hole 8.

[0030] An air outlet 11 is further provided on the lower housing 2, and the air outlet 11 can communicate with the air inlet 7 through an air flow channel.

[0031] In this device, both the air inlet 7 and the air outlet 11 are provided on the lower housing 2. When the valve core 4 is not in contact with the adjusting rod 6, the external gas enters the adjusting rod 6 through the air inlet 7 and the exhaust hole 8, and then is discharged from the air outlet 11. At this time, a pressure difference will be generated, and the pressures at the air inlet 7 and the outlet are different, so that the pneumatic logic element will not act; when the valve core 4 is in pressing contact with the adjusting rod 6, the gas passage is blocked at this time, and the external gas enters the gas passage through the air inlet 7 and the exhaust port. The gas passage is closed and cannot be discharged outward, so that the pressures at the air inlet 7 and the air outlet 11 are kept the same, without a pressure difference, thus controlling the pneumatic logic element to act.

[0032] Two sealing rings 9 are sleeved on the outer circumference of the adjusting rod 6. The two sealing rings 9 are located on the upper and lower sides of the exhaust hole 8, and the two sealing rings 9 are in contact with the lower housing 2 to form a structure for sealing the inner channel of the lower housing 2.

[0033] In this device, the sealing ring 9 is an O-ring, which is arranged at the upper and lower ends of the exhaust hole 8, and the air inlet 7 is always located in the middle of the two O-rings. The O-ring is in close fit with the hollow part of the adjusting rod 6, so that the gas entering through the air inlet 7 cannot leak outwards.

[0034] The signal amplification device includes a silicone rubber sheet 10. The silicone rubber sheet 10 is fixed at the connection between the upper housing 1 and the lower housing 2, and the lower end of the valve core 4 is in contact with the silicone rubber sheet 10.

[0035] The high-pressure signal detection port 3 amplifies the detected pressure gas signal through the silicone rubber sheet 10 and pushes the valve core 4 to slide upwards.

[0036] A bush 5 is fixed in the lower housing 2. The upper end of the valve core 4 can slide through the bush 5 and is located above the bush 5. A spring 12 is sleeved on the valve core 4. The lower end of the spring 12 is fixedly connected to the valve core 4, and the upper end of the spring 12 is fixedly connected to the bush 5. The spring 12 is a structure for driving the valve core 4 to slide downwards.

[0037] The bush 5 seals the lower end of the lower housing 2. When the valve core 4 moves upwards, the spring 12 is compressed and its elastic potential energy increases. Since the spring 12 is a linear component, the distance it moves corresponds to the pressure range. Therefore, when it is feedback to the adjusting rod 6, the vertical distance adjusted by the adjusting rod 6 represents the linear movement of the pressure adjustment.

[0038] When the pressure at the high-pressure signal detection port 3 decreases, the valve core 4 gradually moves away from the adjusting rod 6 under the push of the spring 12, so that the pneumatic logic element connected to the air outlet 11 returns to the initial state.

[0039] The upper end of the adjusting rod 6 is threadedly connected to the upper end of the lower housing 2.

[0040] A rhombus-shaped opening is formed in the adjusting rod 6. By inserting a multi-faceted body into the rhombus-shaped opening and then driving the adjusting rod 6 to rotate, the position of the adjusting rod 6 inside the lower housing 2 can be adjusted, thereby adjusting the magnitude of the detectable air pressure. Moreover, the threaded connection has a good self-locking effect, ensuring the stability of the adjusting rod 6 after adjusting its position.

[0041] A circular hole is provided at the upper end of the lower housing 2. A disc 13 is fixed to the upper end of the adjusting rod 6. There is a gap between the inner wall of the circular hole and the disc 13. A damper is slidably provided at the upper end of the lower housing 2, and the damper is placed inside the circular hole and contacts the disc 13.

[0042] There are many forms of dampers. It can be a rubber block or a strong spring driving a slider to slide horizontally. The strong spring ensures frictional contact between the slider and the disc 13. Under the action of the damper, the stability of the adjusting rod 6 is further ensured.

[0043] Scales are provided on the disc 13.

[0044] The scales are arranged according to angles. Since the spring 12 has a linear elastic force, in terms of feedback pressure, at this time, the moving distance of the adjusting rod 6 and the pressure have a linear relationship. Therefore, when feedback to the disc 13, the scales on the disc 13 are evenly distributed in a circle. This is convenient for processing and for later adjustment and observation.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable pneumatic sensor, comprising an upper housing (1) and a lower housing (2), characterized in that, A high-voltage signal detection port (3) is provided at the lower end of the upper housing (1). A signal amplification device is provided between the upper housing (1) and the lower housing (2). An air flow channel with adjustable vertical position is provided inside the lower housing (2). Above the signal amplification device, there is a valve core (4) that can slide vertically. When the valve core (4) slides upward, it contacts the air flow channel to form a structure for closing the air flow channel.

2. The adjustable pneumatic sensor according to claim 1, characterized in that, The air flow channel includes a hollow adjusting rod (6). The upper end of the adjusting rod (6) is a sealed structure. The valve core (4) contacts and presses against the upper end of the adjusting rod (6) to form a structure for sealing the air flow channel.

3. The adjustable pneumatic sensor according to claim 2, characterized in that, An air inlet (7) is fixed at the upper end of the lower housing (2). An exhaust hole (8) is provided on the adjusting rod (6). The exhaust hole (8) communicates with the inside of the adjusting rod (6). The gas in the air inlet (7) enters the inside of the adjusting rod (6) through the exhaust hole (8).

4. The adjustable pneumatic sensor according to claim 3, characterized in that, Two sealing rings (9) are sleeved on the outer circumference of the adjusting rod (6). The two sealing rings (9) are located on the upper and lower sides of the exhaust hole (8). The two sealing rings (9) contact the lower housing (2) to form a structure for sealing the inner channel of the lower housing (2).

5. The adjustable pneumatic sensor according to claim 3, characterized in that, An air outlet (11) is also provided on the lower housing (2). The air outlet (11) can communicate with the air inlet (7) through the air flow channel.

6. The adjustable pneumatic sensor according to claim 1, wherein The signal amplification device includes a silicone rubber sheet (10). The silicone rubber sheet (10) is fixed at the connection between the upper housing (1) and the lower housing (2). The lower end of the valve core (4) contacts the silicone rubber sheet (10).

7. The adjustable pneumatic sensor according to claim 1, wherein, A bushing (5) is fixed inside the lower housing (2). The upper end of the valve core (4) can slide through the bushing (5) and is located above the bushing (5). A spring (12) is sleeved on the valve core (4). The lower end of the spring (12) is fixedly connected to the valve core (4), and the upper end of the spring (12) is fixedly connected to the bushing (5). The spring (12) is a structure for driving the valve core (4) to slide downward.

8. The adjustable pneumatic sensor according to claim 2, wherein The upper end of the adjusting rod (6) is threadedly connected to the upper end of the lower housing (2).

9. The adjustable pneumatic sensor according to claim 1, wherein A circular hole is provided at the upper end of the lower housing (2). A disc (13) is fixed at the upper end of the adjusting rod (6). There is a gap between the inner wall of the circular hole and the disc (13). A damper is slidably provided at the upper end of the lower housing (2). The damper is placed in the circular hole and contacts the disc (13).

10. The adjustable pneumatic sensor according to claim 9, characterized in that, Scales are provided on the disc (13).

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