Pneumatic positioner mechanism to prevent water ingress

Abstract

The utility model provides a kind of pneumatic positioner mechanism to prevent water, including pneumatic positioner, pneumatic positioner is connected the P port of quick exhaust valve by pipeline, the cylinder of air cylinder is connected the A port of quick exhaust valve, the B port of quick exhaust valve is communicated with outside.Relative to prior art, the technical effect of the utility model is, the utility model is equipped with quick exhaust valve, compressed air is discharged from cylinder, directly discharged atmosphere, even if compressed air is carried together with the water that enters cylinder comes out, also cannot enter pneumatic positioner.

Description

Technical Field

[0001] This utility model belongs to the field of cylinder control technology, specifically relating to a pneumatic positioner mechanism to prevent water ingress. Background Technology

[0002] Pneumatic positioners control the cylinder opening by controlling the pressure and flow rate of compressed air entering and exiting the cylinder. The pneumatic positioner is the core component of a pneumatic actuator. It is installed on the cylinder's air intake (and exhaust) line; compressed air must pass through it for both entry and exit. After receiving control signals, the pneumatic positioner converts them into pneumatic signals to drive the valve (cylinder) to precise movements.

[0003] Pneumatic positioners are precision devices and cannot be exposed to water. To prevent water ingress, the inlet of the pneumatic positioner is equipped with a waterproof filter, which is already quite good.

[0004] However, in industrial sites (water filter outlet regulating gate), many cylinders are exposed to harsh and complex working environments, and the cylinders are corroded or not properly sealed, which can cause water to seep into the cylinder body.

[0005] Technical issue: In this system, compressed air is filtered through a waterproof filter at the inlet when it enters the cylinder from the pneumatic positioner, resulting in dry compressed air entering the cylinder—this step is not problematic. However, when the compressed air exits the cylinder, it carries away any water that has seeped into the cylinder. If this water re-enters the pneumatic positioner, it can cause corrosion and other damage to the positioner's interior. Utility Model Content

[0006] The technical problem to be solved by this utility model is: how to design a pneumatic positioner mechanism to prevent water ingress.

[0007] The specific technical solution of this utility model is as follows: A pneumatic positioner mechanism for preventing water ingress includes a pneumatic positioner connected to the P port of a quick exhaust valve via a pipeline. The A port of the quick exhaust valve is connected to the cylinder body of a cylinder, and the B port of the quick exhaust valve is connected to the outside.

[0008] Compared with the prior art, the technical effect of this utility model is that it is equipped with a fast exhaust valve, so that when the compressed air is discharged from the cylinder, it is directly discharged into the atmosphere. Even if the compressed air carries "water that has seeped into the cylinder" out with it, it will not enter the pneumatic positioner. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention.

[0010] Figure 2 This is a schematic diagram of the utility model in use (1).

[0011] Figure 3 This is a schematic diagram of the utility model in use (2). Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1 A pneumatic positioner mechanism for preventing water ingress includes a pneumatic positioner 10, which is connected to the P port 21 of a quick exhaust valve 20 (also called a quick exhaust valve) via a pipeline. The A port 23 of the quick exhaust valve 20 is connected to the cylinder body 30 of the cylinder, and the B port 22 of the quick exhaust valve 20 is connected to the outside.

[0014] Its working principle is as follows: Cylinder intake: such as Figure 2 Outside gas enters the pneumatic positioner 10 through inlet 11 and then enters port P 21 of the quick exhaust valve 20. At this time, the gas pressure at port P 21 is higher than the gas pressure at port A 23. (See [reference]) Figure 2 Relying on this pressure difference, valve core 24 blocks port B 22 (see arrow A91), allowing external gas to enter the cylinder body 30 and complete the cylinder action.

[0015] Cylinder exhaust: such as Figure 3 Gas from the cylinder enters port P 21 of the rapid exhaust valve 20, while port A 23 is at normal atmospheric pressure. At this time, the pressure at port P 21 is lower than the pressure at port A 23. See [link / reference]. Figure 3 Relying on this pressure difference, valve core 24 blocks port P 21 (see arrow B92), and the gas in the cylinder is discharged into the outside through port B 22, completing the cylinder action.

[0016] This utility model has the following significant advantages: S1. This utility model is equipped with a quick exhaust valve. When the compressed air is discharged from the cylinder, it is directly discharged into the atmosphere. Even if the compressed air carries "water that has seeped into the cylinder" out with it, it will not enter the pneumatic positioner.

[0017] S2. In this field, the pneumatic positioner controls the cylinder opening by controlling the pressure and flow rate of compressed air entering and leaving the cylinder. When compressed air is discharged from the cylinder, the pneumatic positioner does not work. Even if compressed air does not enter the pneumatic positioner, it does not affect the control accuracy of the pneumatic positioner.

[0018] For other details, please refer to the existing technology.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A pneumatic positioner mechanism for preventing water ingress, comprising a pneumatic positioner (10), characterized in that: The pneumatic positioner (10) is connected to the P port (21) of the quick exhaust valve (20) through a pipeline. The A port (23) of the quick exhaust valve (20) is connected to the cylinder body (30) of the cylinder. The B port (22) of the quick exhaust valve (20) is connected to the outside.

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