Drain discharge device

Abstract

To provide a drain discharge device that is unlikely to cause an airlock even when a drain discharge port is low, and can improve drain discharge performance.SOLUTION: A drain discharge device is composed of a drain pipe and a drain trap part. The drain pipe comprises two joint elbows, and a connection pipe connecting between the two joint elbows. One joint elbow is located right below a drain discharge port of a device of a compressed air circuit, and the other joint elbow is located above a drain inlet part of a drain trap. An end part of the connection pipe on the one joint elbow side has an elevation angle of 5 degrees or more from the horizontal relative to an end part thereof on the other joint elbow side. An inner diameter of the drain pipe is 14 mm or more in diameter at all positions.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drain discharge device, and more particularly to a technique for allowing drain to flow smoothly when the distance from a drain discharge port at the bottom of an air tank to a bottom plate is short. [Background technology]

[0002] Conventionally, the distance from the drain outlet at the bottom of the air tank built into an air compressor to the bottom plate of the compressor body case is sometimes short, and in such cases, a 90-degree elbow is usually attached and a piping pipe is extended horizontally from there to the side of the body case. This can cause drain to accumulate in the horizontal part, resulting in an airlock. Another method to avoid airlocks is to use an electrical drain trap that automatically drains the fluid periodically. However, even when there is no drain, the trap periodically discharges the drain, which means that air is also discharged unnecessarily. To avoid this phenomenon, some traps have a built-in water level sensor, but in that case, if an air lock occurs, the water level sensor may not function properly, resulting in poor drainage. Therefore, there was a need for a structure that would be less likely to cause an airlock, even if the drain outlet was low.

[0003] Various techniques have been proposed to address such problems. For example, an automatic drain discharge device (see Patent Document 1) was proposed by the applicant and is a publicly known technique. More specifically, in an automatic drain discharge device that is composed of an air compressor that produces compressed air, an air tank that generates drain from compression, a drain discharge valve that sends out the drain using compressed air, and a drain treatment device that turns the drain into clean water, a drain sensor is disposed somewhere between the air tank and the drain discharge valve so as to obtain information from the drain sensor that sends out the generated drain from the drain discharge valve, and a control unit is disposed that continuously sends out compressed air for a certain period of time to move the drain in the drain treatment device.

[0004] However, in order to discharge the drain, it is necessary to discharge the compressed air periodically, albeit for a short period of time, which reduces the efficiency of using the compressed air. Although this makes it difficult for an airlock to occur, it is not possible to discharge the drain efficiently, and therefore it is not possible to solve the present problem. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3498260 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, an object of the present invention is to provide a drain discharge device that is less likely to cause an airlock and can improve drain discharge performance even when the drain discharge port is low. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a drain drain pipe comprising a drain trap section, the drain drain pipe including two joint elbows and a connecting pipe connecting between the two joint elbows, one joint elbow being located directly below the drain outlet of the equipment of the compressed air circuit and the other joint elbow being located above the drain inlet of the drain trap, the end of the connecting pipe on the equipment side of the compressed air circuit having an elevation angle of 5 degrees or more from the horizontal relative to the end on the drain trap side, and the inner diameter of the drain drain pipe being 14 mm or more at all positions.

[0008] The present invention also provides that the angle of the coupling elbow is at least 95 degrees.

[0010] Furthermore, the present invention employs a means in which the equipment of the compressed air circuit is an air tank.

[0011] Furthermore, the present invention employs a means in which the drain trap portion is a drain trap with a water level sensor that adjusts drain discharge by a water level sensor. Effect of the Invention

[0012] According to the drain discharge device of the present invention, even if the drain discharge port is low, airlock is unlikely to occur, so that the drain discharge performance can be improved. [Brief description of the drawings]

[0013] [Figure 1] 1 is a partial front cross-sectional view showing an embodiment of a drain discharge device according to the present invention. [Diagram 2] 1 is a schematic diagram showing a drainage device in which a drainage pipe is a rubber hose; FIG. [Diagram 3] FIG. 4 is a partial front sectional view showing a drain discharge device according to another embodiment of the present invention. [Figure 4] FIG. 11 is a partial front cross-sectional view showing a conventional drain discharge device. [Diagram 5] FIG. 11 is a partial front sectional view showing another embodiment of a drain discharge device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The drain discharge device according to the present invention has an greatest feature in that it can reduce the likelihood of airlock even when the drain discharge port is low. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a drain discharge device according to the present invention will be described with reference to the drawings. The overall configuration and each part of the drain discharge device shown below are not limited to the embodiments described below, but can be modified as appropriate within the scope of the technical idea of ​​the present invention, i.e., within the scope of shapes, dimensions, structures, etc. that can achieve the same functional effects.

[0015] The present invention will be described with reference to Fig. 1 to Fig. 5. Fig. 1 is a partial front sectional view showing an embodiment of a drain discharge device according to the present invention. Fig. 2 is a schematic diagram showing a case where a drain discharge pipe in the drain discharge device is a rubber hose. Fig. 3 is a schematic diagram showing a drain discharge device according to the present invention. Different from Fig. 4 is a partial front sectional view showing an embodiment of the drain discharge device. Fig. 5 is a partial front sectional view showing another embodiment of the drain discharge device. The drain discharge device 1 discharges drain generated in a compressed air circuit, and in this embodiment, discharges drain from an air tank 40 attached to an air compressor 30. The drain discharge device 1 is composed of a drain trap portion 20 and a drain discharge pipe 10.

[0016] The drain trap section 20 is a section that discharges drain from the air tank 40 etc. As the drain trap section 20, there are ones that discharge the accumulated drain when it reaches a certain amount or more, and ones that discharge the drain periodically. In this embodiment, a drain trap with a water level sensor is used, which uses a water level sensor 23 and opens an electromagnetic valve 24 to discharge the drain when the drain reaches a certain level or more. The drain trap section 20 mainly comprises a drain accumulation section 22 and an electromagnetic valve 24 .

[0017] The drain retention section 22 is a section for temporarily retaining the drain that has flowed in from the air tank 40 etc. The drain flows in from the drain inlet 21 at the top of the drain retention section 22. A water level sensor 23 is disposed in the drain accumulation section 22, and is capable of detecting when the amount of accumulated drain reaches a certain amount or more. The drain accumulation section 22 is connected to an electromagnetic valve 24. The solenoid valve 24 is a valve that controls the discharge of drainage. The opening and closing of the valve can be electrically controlled. The solenoid valve 24 opens and closes depending on the detection content of the water level sensor 23. When the water level sensor 23 detects the water level, it means that the drainage is equal to or greater than a certain amount, so the solenoid valve 24 opens. Then, the drain that has accumulated in the drain accumulation section 22 is discharged from the solenoid valve 24 to the drain discharge section 25. When the drain is discharged and the water level sensor 23 no longer detects the water level, the solenoid valve 24 closes the valve because the drain has not reached a certain amount. In this way, the drain trap section 20 discharges the drain as appropriate.

[0018] The drain discharge pipe 10 guides drain generated from devices in the compressed air circuit, such as the air tank 40, to a drain trap. The drain discharge pipe 10 includes two joint elbows 11 and a connecting pipe 12 that connects between the two joint elbows 11 . The joint elbow 11 is a joint that bends the flow. In this embodiment, both of the two joint elbows 11 are special angle elbows having an angle of at least 95 degrees. At least 95 degrees refers to an angle range of about 95 degrees to 100 degrees. The normal joint elbow 17 is a 90-degree elbow having an angle of 90 degrees. The joint elbow 11 is a special angle elbow, which is an elbow having an angle different from 90 degrees. The angle of the elbow is determined by the position of the drain outlet 41 of the air tank 40 and the position of the drain inlet 21 of the drain trap portion 20. One of the joints, the elbow 11, is located directly below the drain outlet 41 of the air tank 40, which is a device of the compressed air pressure circuit, and is connected to the drain outlet 41. If the drain outlet 41 has a female thread, a male-male joint is interposed as the thread conversion joint 15. The other joint elbow 11 is located above the drain inlet 21 of the drain trap section 20 and is connected to the drain inlet 21.

[0019] The two joint elbows 11 are connected by a connecting pipe 12, which in this embodiment is a straight pipe 13. The end of the connecting pipe on the equipment side of the compressed air circuit has an elevation angle of 5 degrees or more from the horizontal with respect to the end on the drain trap side. Therefore, the drain outlet 41 of the air tank 40 and the drain inlet 21 of the drain trap section 20 are connected with a gentle slope by the two joint elbows 11 with an angle of at least 95 degrees and the connecting pipe 12. In addition, the inner diameter of the drain pipe shall be 14 mm or more at all positions.

[0020] One of the devices in the compressed air circuit is the air compressor 30. The air compressor 30 generates compressed air by compressing air in the atmosphere. The compressed air is temporarily stored in an air tank 40. Compressed air contains a large amount of water vapor, which becomes liquid when compressed and accumulates as drain in the air tank 40. The drain needs to be drained quickly because it can cause rust, etc. For this reason, a drain outlet 41 is provided at the bottom of the air tank 40.

[0021] If the drain outlet 41 is simply opened to discharge the drain in the air tank 40, the compressed air will be discharged together with the drain. For this reason, the drain trap unit 20 is often used to discharge the drain while restricting the discharge of the compressed air. Figure 4 shows an example of a conventional arrangement. An air tank 40 is disposed inside the housing of the air compressor 30. The drain outlet 41 of the air tank 40 is located at the bottom of the air tank 40. The distance between the bottom of the housing of the air compressor 30 and the drain outlet 41 is small, and in many cases, it is not possible to insert the drain trap unit 20 between them. Therefore, a side hole 31 is provided in the housing of the air compressor 30, and drain from a drain outlet 41 is guided to the outside of the air compressor 30 by a pipe or the like and connected to the drain inlet 21 of the drain trap section 20. The height of the housing of the air compressor 30 is adjusted by appropriately arranging a pedestal section 32 under the housing. Then, when the drain trap section 20 is connected using the 90-degree joint elbow 17 and the straight pipe 13, it will look like Figure 4. With this arrangement, it looks like the drain from the air tank 40 enters the drain trap section 20 and is appropriately discharged from the drain trap section 20.

[0022] However, when a 90-degree joint elbow 17 is used, the straight pipe 13 connected to it is naturally arranged horizontally. Then, the drain will flow toward the drain trap section 20 while remaining in the straight pipe 13. If the pipe is thin, the drain may block part of the pipe. In that case, there is no escape route for the air in the drain retention section 22 of the drain trap section 20, and the air attempting to escape from the drain trap section 20 toward the air tank 40 and the drain attempting to flow from the air tank 40 into the drain trap section 20 collide in the straight pipe 13. This is known as an air lock (air binding). As a result, even though drainage is occurring, the drainage cannot flow into the drain trap portion 20, the water level sensor 23 cannot detect the drainage, and the drainage cannot be discharged.

[0023] One method of avoiding an airlock is to use a pressure-resistant rubber hose 16, as shown in Figure 2. However, the bending radius of the pressure-resistant rubber hose 16 is large, and if the space between the drain outlet 41 of the air tank 40 and the bottom of the housing is narrow, the hose cannot be bent properly and cannot be positioned. On the other hand, by using a joint elbow 11 of at least 95 degrees, it is possible to give an inclination to the connecting pipe 12 as shown in FIG.

[0024] The drain discharge pipe 10 is configured such that a thread conversion fitting 15, which is a male-male fitting for male-female conversion, is fixed to the drain discharge outlet 41 of the air tank 40, and the thread conversion fitting 15 is connected to one side of a fitting elbow 11 of at least 95 degrees, and a straight pipe 13, which is a connecting pipe 12, is connected to the other side. The straight pipe 13 is inclined according to the angle of the joint elbow 11. The end of the straight pipe 13 is connected to another joint elbow 11. Since the joint elbow 11 on the drain trap section 20 side also has a similar angle, the straight pipe 13 and the drain water inlet section 21 of the drain trap section 20 are connected without any difficulty. The thread conversion joint 15, joint elbow 11, and connecting pipe 12 all have a diameter of 14 mm or more. This thickness allows the drain in the air tank 40 to be sent to the drain trap section 20 without difficulty. At the same time, air in the drain accumulation section 22 in the drain trap section 20 can be sent from the drain trap section 20 side to the air tank 40 side through the gap between the drain and the connecting pipe 12, etc.

[0026] In addition, in this embodiment, two special angle joint elbows 11 are used, but as shown in Figure 5, it is also possible to use one special angle joint elbow 11 and a normal 90-degree joint elbow 17. By adopting such a configuration, the number of special angle joint elbows 11 can be reduced, thereby reducing the burden of procurement work. In this configuration, the drain trap section 20 is installed at an angle, but since the angle is only about 5 to 10 degrees, it does not significantly affect the detection by the water level sensor 23, and the drain can be discharged appropriately.

[0027] In this way, according to the drain discharge device of the present invention, even if the drain discharge port is low, airlock is unlikely to occur, so that the drain discharge performance can be improved.

[0028] In addition, according to the present invention, by making the angle of the joint elbow at least 95 degrees or more, it is possible to easily install an inclined drain pipe, and to obtain a force that flows the drain in the direction of the drain trap.

[0030] Furthermore, according to the present invention, drainage of an air tank having a low drain outlet can be carried out smoothly.

[0031] Furthermore, according to the present invention, in a drain trap equipped with a water level sensor, drain can be discharged without causing an airlock. [Industrial Applicability]

[0032] It is understood that the drain discharge device according to the present invention has great industrial applicability as a technology for avoiding airlock in a drain trap. [Explanation of symbols]

[0033] 1 Drain discharge device 10 Drain discharge pipe 11 Elbow joint (special angle elbow) 12 Connecting pipe 13 straight pipe 14 Bent pipe 15 Thread conversion fitting 16 Pressure-resistant rubber hose 17 Elbow joint (90 degree elbow) 20 Drain trap section 21 Drain inlet 22 Drain retention section 23 Water level sensor 24 Solenoid valve 25 Drain discharge section 30 Air Compressor 31 Side hole 32 Base 40 Air Tank 41 Drain outlet 50 water level

Claims

1. A drain discharge device for discharging drain water in a compressed air circuit, It consists of a drain pipe and a drain trap part, The drain pipe includes two joint elbows and a connecting pipe connecting between the two joint elbows, One of the joint elbows is located directly below the drain outlet of the equipment of the compressed air pressure circuit, The other joint elbow is located above the drain inlet of the drain trap section, The end of the connecting pipe on the equipment side of the compressed air circuit has an elevation angle of 5 degrees or more from the horizontal with respect to the end of the drain trap side, At least one of the fitting elbows has an angle of at least 95 degrees; A drain discharge device characterized in that the inner diameter of the drain pipe is 14 mm or more at all positions.

2. 2. The drain discharge device according to claim 1, wherein the device of the compressed air pressure circuit is an air tank.

3. 3. The drain discharge device according to claim 1, wherein the drain trap portion is a drain trap with a water level sensor that adjusts drain discharge by a water level sensor.

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