Adjustable pneumatic sensor

Abstract

The invention 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 invention relates to the technical field of control valves, and in particular to an adjustable pneumatic sensor. Background Art

[0002] The positive pressure protection system must be equipped with one or more automatic safety devices to trigger the action when the positive pressure value in the positive pressure shell drops below the minimum value specified by the manufacturer; in the positive pressure shell and its pipeline where leakage may occur, the minimum positive pressure value that should be maintained at each part relative to the external pressure is: 50Pa for protection level "pxb" or "pyb" and 25Pa for protection level "pzc".

[0003] The existing positive pressure protection system mainly adopts the following two methods: one is an electronic sensor combined with a solenoid valve as an automatic safety device, but this method is susceptible to electromagnetic interference, difficult to meet explosion-proof requirements, and requires additional power supply; the other is a pneumatic sensor combined with a pneumatic logic element, but the pneumatic sensor has insufficient accuracy under micro-pressure conditions (such as 25Pa and 50Pa), and the action value is difficult to adjust, which increases the use and maintenance cost of the positive pressure protection system. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an adjustable pneumatic sensor, which solves the problem that the current pneumatic sensors have insufficient accuracy under micro-pressure conditions and the action value is difficult to adjust.

[0005] The present invention solves the technical problem through the following technical means: an adjustable pneumatic sensor includes an upper shell and a lower shell, a high-voltage signal detection port is arranged at the lower end of the upper shell, a signal amplifying device is arranged between the upper shell and the lower shell, an air flow channel with an adjustable vertical position is arranged in the lower shell, a vertically slidable valve core is arranged above the signal amplifying device, and the valve core slides upward and contacts with the air flow channel to form a structure for closing the air flow channel.

[0006] Preferably, the airflow channel comprises a hollow regulating rod, the upper end of the regulating rod is a sealed structure, and the valve core is in compression contact with the upper end of the regulating rod to form a structure that seals the airflow channel.

[0007] Preferably, an air inlet is fixed at the upper end of the lower shell, and an exhaust hole is provided on the adjusting rod. The exhaust hole is communicated with the interior of the adjusting rod, and 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, and the two sealing rings are located at the upper and lower sides of the exhaust hole. The two sealing rings are in contact with the lower shell body to form a structure for sealing the channel in the lower shell body.

[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 present invention 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: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after being cut open (the upper shell, the lower shell and the cassia rubber sheet are cut open); Figure 3 This is a schematic diagram of the structure of the present invention after being cut open (the cinnamon rubber sheet is not cut open); Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle part A; Figure 5 for Figure 3 The enlarged structural diagram of the middle B part; In the figure: 1. upper shell; 2. lower shell; 3. high-voltage signal detection port; 4. valve core; 5. core filling; 6. adjusting rod; 7. air inlet; 8. exhaust hole; 9. sealing ring; 10. silicone rubber sheet; 11. air outlet; 12. spring; 13. disc. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1-5 The specific implementation modes of the present invention are described in further detail.

[0018] like Figure 1-5 As 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 amplifying device is provided between the upper shell 1 and the lower shell 2, an air flow channel with an adjustable vertical position is provided in the lower shell 2, a vertically slidable valve core 4 is provided above the signal amplifying device, and the valve core 4 slides upward to contact the air flow channel to form a structure that closes the air flow channel.

[0019] In this device, the high-voltage signal detection port 3 at the center of the upper shell 1 is connected to the pressure detection point inside the casing of the electrical equipment to be detected. The detected pressure gas signal is amplified by the signal amplification device, pushing the valve core 4 to move upward, and the valve core 4 moves up and down until it contacts the air flow channel, thereby sealing the air flow channel. In this way, the intake air from the outside entering the lower shell 2 cannot be discharged, thereby ensuring consistent pressure, thereby controlling the pneumatic logic element to operate.

[0020] The vertical position of the airflow channel in the device can be adjusted. According to the different positions of the airflow channel, the effective running distance of the valve core 4 is different, thereby determining the maximum pressure value, and the adjustment is convenient.

[0021] The airflow channel comprises a hollow regulating rod 6 , the upper end of which is a sealed structure, and the valve core 4 is in compression contact with the upper end of the regulating rod 6 to form a structure that seals the airflow channel.

[0022] In this device, the upper end of the adjusting rod 6 is sealed and the lower end is hollow, thereby forming a channel for gas circulation. When the valve core 4 slides upward and is squeezed into contact with the adjusting rod 6, the valve core 4 blocks the hole at the lower end of the adjusting rod 6. At this time, the channel for gas circulation is blocked and the airflow cannot flow.

[0023] An air inlet 7 is fixed at the upper end of the lower shell 2 , and 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 , and the gas in the air inlet 7 enters the adjusting rod 6 through the exhaust hole 8 .

[0024] The lower shell 2 is also provided with an air outlet 11 , which can communicate with the air inlet 7 through an air flow channel.

[0025] In the present device, the air inlet 7 and the air outlet 11 are both arranged on the lower shell 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 of the air inlet 7 and the outlet are different, so that the pneumatic logic element will not operate; when the valve core 4 is squeezed and contacted with the adjusting rod 6, the gas channel is blocked, and the external gas enters the gas channel through the air inlet 7 and the exhaust port. The gas channel is closed and cannot be discharged to the outside, so that the pressure of the air inlet 7 and the air outlet 11 remain consistent, and there is no pressure difference, thereby controlling the pneumatic logic element to operate.

[0026] The outer circumference of the adjusting rod 6 is sleeved with two sealing rings 9 , which are located at the upper and lower sides of the exhaust hole 8 . The two sealing rings 9 are in contact with the lower shell 2 to form a structure for sealing the channel in the lower shell 2 .

[0027] 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 position of the two O-rings. The O-ring fits tightly with the hollow part of the adjusting rod 6, so that the gas entering through the air inlet 7 cannot leak out.

[0028] The signal amplifying device comprises a silicone rubber sheet 10 , which is fixed at the connection between the upper shell 1 and the lower shell 2 , and the lower end of the valve core 4 is in contact with the silicone rubber sheet 10 .

[0029] 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 upward.

[0030] A bushing 5 is fixed in the lower housing 2, and 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, and 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.

[0031] The bushing 5 seals the lower end of the lower housing 2. When the valve core 4 moves upward, the spring 12 is compressed and its elastic potential energy increases. Because the spring 12 is a linear element, the distance it moves corresponds to the range of pressure, so it is fed back to the adjusting rod 6. The vertical distance adjusted by the adjusting rod 6 represents the linear movement of the pressure regulation.

[0032] When the pressure of the high-pressure signal detection port 3 decreases, the valve core 4 gradually leaves the adjustment 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.

[0033] The upper end of the adjusting rod 6 is threadedly connected to the upper end of the lower shell 2 .

[0034] A prismatic opening is provided on the adjusting rod 6, and the polygonal body is inserted into the prismatic opening, and then the adjusting rod 6 is driven to rotate, so as to adjust the position of the adjusting rod 6 in the lower shell 2, thereby adjusting the size of the detectable air pressure, and the threaded connection has a good self-locking effect, thereby ensuring the stability of the adjusting rod 6 after the position is adjusted.

[0035] A circular hole is provided at the upper end of the lower shell 2, a disc 13 is fixed at the upper end of the adjusting rod 6, a gap is provided between the inner wall of the circular hole and the disc 13, a damper is slidably provided at the upper end of the lower shell 2, and the damper is placed in the circular hole and contacts the disc 13.

[0036] There are many forms of dampers, which can be rubber blocks or a strong spring that drives the slider to slide horizontally. The strong spring ensures that the slider is in frictional contact with the disk 13. Under the action of the damper, the stability of the adjustment rod 6 is further guaranteed.

[0037] The disk 13 is provided with scales.

[0038] The scale is arranged according to the angle. Since the elastic force of the spring 12 is linear, the feedback pressure is such that the distance the adjusting rod 6 moves is linearly related to the pressure. Therefore, it is fed back to the disk 13. The scale of the disk 13 is evenly distributed around the circumference, which is convenient for processing and later adjustment and observation.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in 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 shell (1), a signal amplifying device is provided between the upper shell (1) and the lower shell (2), an air flow channel with an adjustable vertical position is provided in the lower shell (2), a vertically slidable valve core (4) is provided above the signal amplifying device, and the valve core (4) slides upwards and contacts the air flow channel to form a structure that closes the air flow channel.

2. An adjustable pneumatic sensor according to claim 1, characterized in that: The airflow channel comprises a hollow regulating rod (6), the upper end of the regulating rod (6) is a sealed structure, and the valve core (4) is in compression contact with the upper end of the regulating rod (6) to form a structure that seals the airflow channel.

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

4. An adjustable pneumatic sensor according to claim 3, characterized in that: Two sealing rings (9) are sleeved on the outer circumference of the regulating 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) are in contact with the lower shell (2) to form a structure for sealing the inner channel of the lower shell (2).

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

6. The adjustable pneumatic sensor according to claim 1, characterized in that: The signal amplifying device comprises a silicone rubber sheet (10), the silicone rubber sheet (10) being fixed at the connection between the upper shell (1) and the lower shell (2), and the lower end of the valve core (4) being in contact with the silicone rubber sheet (10).

7. The adjustable pneumatic sensor according to claim 1, characterized in that: A bushing (5) is fixed in 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); 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 1, characterized in that: The upper end of the adjusting rod (6) is threadedly connected to the upper end of the lower shell body (2).

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

10. An adjustable pneumatic sensor according to claim 9, characterized in that: The disc (13) is provided with scales.

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