Automatic drainage device for compressed air storage tank

Abstract

This invention provides an automatic drainage device for compressed air storage tanks, comprising a tank body, an inlet pipe and an outlet pipe fixedly connected to the outer peripheral wall of the tank body, a drain pipe fixedly connected to the bottom of the tank body, a water collection container fixedly connected to the bottom of the drain pipe, and a water outlet pipe fixedly connected to the bottom of the water collection container. A solenoid valve and a steam trap are connected in series on the water outlet pipe. In this invention, a water collection container for storing condensate is located at the bottom of the tank body, a non-contact sensor is installed at the top of the water collection container, and a solenoid valve and a steam trap are connected in series at the bottom of the water collection container via the water outlet pipe. A PLC controller electrically connected to the solenoid valve and the non-contact liquid level sensor is also provided, enabling the liquid in the water collection container to control the opening and closing of the solenoid valve to drain according to the set liquid level height. This provides automatic drainage control and significantly reduces the failure rate of pneumatic instruments.

Description

Technical Field

[0001] This utility model relates to the field of compressed air storage tank technology, specifically an automatic drainage device for compressed air storage tanks. Background Technology

[0002] Compressed air receivers are tanks used to store the gas delivered by air compressors. Because air contains moisture, liquid (condensate) will accumulate inside the compressed air receiver after prolonged use. This condensate needs to be drained regularly to prevent it from flowing back into pneumatic instruments and causing corrosion (industry data shows that instrument failures caused by this account for 23%).

[0003] Currently, the common drainage method involves installing a drain valve at the bottom of the gas storage tank and manually operating it. However, this method is prone to being forgotten or experiencing untimely drainage. Another drainage method is the traditional float-type automatic drain valve, which is prone to failure due to impurities (failure rate >15%). Both of these drainage methods are prone to energy loss, specifically because the inability to control the drainage frequency based on the liquid level leads to the discharge of large amounts of compressed air, resulting in waste.

[0004] Therefore, this utility model provides an automatic drainage device for compressed air storage tanks. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an automatic drainage device for compressed air storage tanks to solve the problems mentioned in the background technology. This utility model has the functions of detecting liquid level and automatic discharge, which greatly reduces the failure rate of pneumatic instruments and the waste of compressed air.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic drainage device for a compressed air storage tank, comprising a tank body, an inlet pipe and an outlet pipe fixedly connected to the outer peripheral wall of the tank body, a drain pipe fixedly connected to the bottom of the tank body, a water collection vessel fixedly connected to the bottom of the drain pipe, a water outlet pipe fixedly connected to the bottom of the water collection vessel, a solenoid valve and a steam trap connected in series on the water outlet pipe, and further comprising a non-contact liquid level sensor and a PLC controller. The non-contact liquid level sensor is fixedly installed on the top of the water collection vessel, and the PLC controller is electrically connected to the non-contact liquid level sensor and the solenoid valve. A filter screen is provided at the bottom of the tank body, and a switching mechanism is provided on the tank body for replacing the filter screen.

[0007] Furthermore, this includes a PLC that connects to a non-contact liquid level sensor via a shielded cable.

[0008] Furthermore, it also includes an alarm, with the PLC controller electrically connected to the solenoid valve and the alarm.

[0009] Furthermore, the switching mechanism includes a conical sleeve, an electric push rod, and a carrier plate. The conical sleeve is fixedly fitted inside the water collection tank. The carrier plate is horizontally installed through the water collection tank and the two are slidably sealed together. The carrier plate is located below the conical sleeve and has a placement groove for placing the filter screen. The bottom of the placement groove has a water passage hole. The electric push rod is fixedly installed outside the water collection tank and its output shaft is fixedly connected to one end of the carrier plate.

[0010] Furthermore, a positioning ring is fixedly sleeved on the outside of the filter screen, and an annular sealing gasket is adhered to the upper end face of the positioning ring.

[0011] Furthermore, the water collection vessel is externally fixedly connected to a guide sleeve fitted on the outside of the carrier plate, and a sealing sleeve is nested inside the guide sleeve.

[0012] Furthermore, a control valve is connected in series on the drain pipe.

[0013] The beneficial effects of this utility model are as follows:

[0014] In this invention, a water collection jug is placed at the bottom of the tank to store condensate. A non-contact sensor is then installed at the top of the water collection jug. A solenoid valve and a steam trap are connected in series at the bottom of the water collection jug via a water outlet pipe. A PLC controller is then installed that is electrically connected to the solenoid valve and the non-contact liquid level sensor. This allows the liquid in the water collection jug to be drained by controlling the opening and closing of the solenoid valve according to the set liquid level height. This provides an automatic drainage function and greatly reduces the failure rate of pneumatic instruments.

[0015] In this invention, a switching mechanism is provided on the water collection vessel. The switching mechanism includes an electric push rod, a carrier plate, and a conical sleeve. The carrier plate and the water collection vessel pass through each other and slide in a sealed manner. The carrier plate is provided with a placement groove for placing the filter screen. The electric push rod is located outside the water collection vessel. When the carrier plate is moved, it can drive the filter screen to move out of the water collection vessel. The filter screen can be replaced by picking it up and putting it down, which has the advantage of making it more convenient to replace the filter screen. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an automatic drainage device for a compressed air storage tank according to the present invention.

[0017] Figure 2 This is a plan view of the water collection tank and switching mechanism of an automatic drainage device for compressed air storage tank according to this utility model.

[0018] Figure 3 This is a schematic diagram of the carrier plate, filter screen, and conical sleeve of the automatic drainage device for compressed air storage tank of this utility model after explosion and unfolding.

[0019] In the diagram: 1. Tank body; 11. Air inlet pipe; 12. Air outlet pipe; 13. Drain pipe; 2. Water collection container; 21. Guide sleeve; 211. Sealing sleeve; 3. Water outlet pipe; 4. Solenoid valve; 5. Steam trap; 6. Non-contact liquid level sensor; 8. Filter screen; 81. Positioning ring; 811. Annular sealing gasket; 9. Switching mechanism; 91. Conical sleeve; 92. Electric push rod; 93. Carrier plate; 931. Placement slot; 9311. Water passage hole; 101. Control valve. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] Please see Figures 1 to 3 This utility model provides a technical solution: an automatic drainage device for a compressed air storage tank, including a tank body 1, an air inlet pipe 11 and an air outlet pipe 12 fixedly connected to the outer peripheral wall of the tank body 1, a drain pipe 13 fixedly connected to the bottom of the tank body 1, and a water collection vessel 2 fixedly connected to the bottom of the drain pipe 13. After the condensate in the tank body 1 settles, it will flow into the water collection vessel 2 by its own weight. The water collection vessel 2 is set in a conical structure to facilitate the downward drainage of liquid.

[0022] A water outlet pipe 3 is fixedly connected to the bottom of the water collection tank 2. A solenoid valve 4 and a steam trap 5 are connected in series on the water outlet pipe 3. The solenoid valve 4 is an explosion-proof structure and its model is EXⅡBT4. When the solenoid valve 4 is opened, the liquid in the water collection tank 2 will be discharged through the steam trap 5. There are many types of steam traps 5. The corresponding model can be selected as needed. This application will not describe them in detail.

[0023] It also includes a non-contact liquid level sensor 6 and a PLC controller. The non-contact liquid level sensor 6 is fixedly installed on the top of the water collection tank 2. The model of the non-contact liquid level sensor 6 is E+H FTL41, but other models can also be used. The non-contact liquid level sensor 6 is used to monitor the height of the liquid level in the water collection tank 2. The PLC controller is electrically connected to the non-contact liquid level sensor 6 and the solenoid valve 4. The highest and lowest liquid levels in the water collection tank 2 are set by programming the PLC controller. The PLC controller controls the opening and closing of the solenoid valve 4 according to the liquid level signal detected by the non-contact liquid level sensor 6.

[0024] In this embodiment, a PLC is included that is connected to the non-contact liquid level sensor 6 via a shielded cable. The touch screen can be installed in the central control room and is used to directly display the liquid level in the water collection tank 2.

[0025] In this embodiment, an alarm is also included. The PLC controller is electrically connected to the solenoid valve 4 and the alarm. The PLC controller is used to control the solenoid valve 4 to open after a delay and to record the time when the solenoid valve 4 receives the opening command. If the liquid level detected by the non-contact liquid level sensor 6 does not change or the solenoid valve 4 does not open after a certain time (e.g., 10 seconds), the PLC controller will trigger the alarm to remind the operator. The alarm can be installed on-site or in the central control room.

[0026] The bottom of the tank 1 is equipped with a filter screen 8 (80 mesh). The function of the filter screen 8 is to filter impurities in the condensate and prevent impurities from affecting the opening and closing of the solenoid valve 4 and the drainage flow of the steam trap 5.

[0027] Furthermore, a switching mechanism 9 is provided on the tank body 1. This switching mechanism 9 is used to replace the filter screen 8. Since the filter screen 8 will become clogged after a certain period of operation, affecting the flow of condensate, it needs to be replaced regularly.

[0028] Specifically, the switching mechanism 9 includes a conical sleeve 91, an electric push rod 92, and a carrier plate 93. The conical sleeve 91 is fixedly fitted inside the water collection tank 2, and the carrier plate 93 is set to pass through the water collection tank 2 laterally, with the two sliding and sealingly engaged. In a preferred implementation, a guide sleeve 21 is fixedly connected to the outside of the water collection tank 2 and fitted outside the carrier plate 93, and a sealing rubber sleeve 211 is nested inside the guide sleeve 21. The carrier plate 93 is located below the conical sleeve 91 and has a placement groove 931 for placing the filter screen 8. The small end of the conical sleeve 91 faces downward, and its function is to guide the condensate in the water collection tank 2 towards the filter screen 8. When the filter screen 8 is below the conical sleeve 91, the two are in a tight fit. Specifically, a positioning ring 81 is fixedly sleeved on the outside of the filter screen 8, and an annular sealing gasket 811 is glued to the upper end face of the positioning ring 81. The upper end face of the annular sealing gasket 811 is in contact with the lower end face of the conical sleeve 91. A water passage hole 9311 is opened at the bottom of the placement groove 931 to allow water to pass through. The function of the electric push rod 92 is to be opposite to the water outlet pipe 3. The electric push rod 92 is fixedly installed on the outside of the water collection tank 2 and its output shaft is fixedly connected to one end of the carrier plate 93. The electric push rod 92 drives the carrier plate 93 to move laterally, which can drive the filter screen 8 to the outside of the water collection tank 2. The filter screen 8 can be replaced by picking it up and putting it down. Specifically, the outer wall of the water collection tank 2 is fixedly connected to the electric push rod 92 through the slotted frame. The electric push rod 92 is electrically connected to the PLC controller. Then, the PLC controller is connected to an operation panel. The operation panel can be installed on the outer wall of the water collection tank 2. The electric push rod 92 can be manually controlled by the operation panel.

[0029] In this embodiment, a control valve 101 is connected in series on the drain pipe 13. The control valve 101 can be a manual ball valve. Its function is to block the drain pipe 13 to prevent gas in the tank 1 from entering the water collection tank 2 when the filter screen 8 is replaced, thereby avoiding the problem of a large amount of gas leakage and waste.

[0030] Working Principle: The electrical equipment on this device is connected to a control box, which supplies power to the equipment. Control valve 101 is normally open, allowing condensate from tank 1 to flow into collection vessel 2. When the liquid level in collection vessel 2 rises above the upper limit, the non-contact level sensor 6 transmits the detected level signal to the PLC controller. The PLC controller then controls solenoid valve 4 to open slowly after a delay. The liquid in collection vessel 2 passes through filter screen 8 and is discharged through steam trap 5. When the liquid level in collection vessel 2 drops to below or equal to the lower limit, the PLC controller closes solenoid valve 4.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic drainage device for a compressed air storage tank, comprising a tank body (1), wherein an air inlet pipe (11) and an air outlet pipe (12) are fixedly connected to the outer peripheral wall of the tank body (1), and a drain pipe (13) is fixedly connected to the bottom of the tank body (1), characterized in that, The bottom of the drain pipe (13) is fixedly connected to a water collection tank (2), the bottom of the water collection tank (2) is fixedly connected to a water outlet pipe (3), a solenoid valve (4) and a steam trap (5) are connected in series on the water outlet pipe (3), and a non-contact liquid level sensor (6) and a PLC controller are also included. The non-contact liquid level sensor (6) is fixedly installed on the top of the water collection tank (2), and the PLC controller is electrically connected to the non-contact liquid level sensor (6) and the solenoid valve (4). A filter screen (8) is provided at the bottom of the tank (1), and a switching mechanism (9) is provided on the tank (1). The switching mechanism (9) is used to replace the filter screen (8).

2. The automatic drainage device for a compressed air storage tank according to claim 1, characterized in that: This includes a PLC that is connected to a non-contact liquid level sensor (6) via a shielded cable.

3. The automatic drainage device for a compressed air storage tank according to claim 1, characterized in that: It also includes an alarm, and the PLC controller is electrically connected to the solenoid valve (4) and the alarm.

4. The automatic drainage device for a compressed air storage tank according to claim 1, characterized in that: The switching mechanism (9) includes a conical sleeve (91), an electric push rod (92), and a carrier plate (93). The conical sleeve (91) is fixedly fitted inside the water collection tank (2). The carrier plate (93) is set horizontally through the water collection tank (2) and the two are slidably sealed together. The carrier plate (93) is located below the conical sleeve (91) and has a placement groove (931) for placing the filter screen (8). A water passage hole (9311) is opened at the bottom of the placement groove (931). The electric push rod (92) is fixedly set outside the water collection tank (2) and its output shaft is fixedly connected to one end of the carrier plate (93).

5. The automatic drainage device for a compressed air storage tank according to claim 4, characterized in that: The filter screen (8) is fixedly fitted with a positioning ring (81), and an annular sealing gasket (811) is bonded to the upper end face of the positioning ring (81).

6. The automatic drainage device for a compressed air storage tank according to claim 4, characterized in that: The water collection tank (2) is fixedly connected to the outside of the guide sleeve (21) which is sleeved on the outside of the carrier plate (93), and a sealing sleeve (211) is nested inside the guide sleeve (21).

7. The automatic drainage device for a compressed air storage tank according to claim 4, characterized in that: A control valve (101) is connected in series on the drain pipe (13).

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