JP2019002414A - Float-type drain trap - Google Patents

Abstract

To provide a float-type drain trap which prevents the intrusion of foreign matters at manual discharge, can surely block air leakage at a failure of a drain valve, and can easily switch three modes of an automatic discharge mode, the manual discharge mode and a block mode.SOLUTION: A valve body 3 in which a drain valve 14 is accommodated is arranged so as to be located in a drain body 2 which is continuously arranged at a lower part of a drain case 1 at its lower side while communicating with the inside of the drain case 1 via a foreign matter intrusion prevention net 11 at its upper side, a drain bypass flow passage 31 bypassing the drain valve 14 communicating with the inside of the drain case 1 is formed at the valve body 3 via the foreign matter intrusion prevention net 11, and a float-type drain trap can switch three modes of an automatic discharge mode, a manual discharge mode and a block mode by a lift operation of a drain piston 7 accommodated in the drain body 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a float drain trap used for automatically discharging drain in compressed air.

Conventionally, a float drain trap has been widely used to discharge drain in compressed air (see, for example, Patent Document 1).
By the way, in the case of draining manually in a float drain trap as shown in FIG. 8A, as shown in FIG. 8B, by pushing up the valve body 3 from below, the drain case 1 and There is one in which a gap is formed between the valve body 3 and the drain is discharged along a flow path indicated by an arrow through the conduction hole 30 of the valve body 3.

However, in this drain manual discharge method, the conduction hole 30 is provided in the lower portion of the drain case 1 and the discharged drain does not pass through the foreign matter intrusion prevention network 11, so foreign matters are likely to enter.
For this reason, foreign matter is likely to adhere to the seal packing 18, and there is a problem that even if release of the valve body 3 is released and drainage is stopped, troubles such as drain leakage due to biting of foreign matter occur.
Further, when a stop valve is attached to the discharge port 21, there is a problem that drain leakage occurs due to the biting of foreign matter.

  Moreover, the manual drainage method of the conventional float drain trap is performed by pushing up the valve body 3 from below, but since the pressure inside the drain case 1 is applied, a large force is required to push up with bare hands. There was a problem that it was necessary.

  Furthermore, in the conventional float drain trap, when there is a drain leak, there is no structure or means for urgently closing, so a stop valve must be separately attached to the discharge port 21.

JP 2007-16877 A

  In view of the problems of the above-described conventional float drain trap, the present invention can prevent foreign matter from entering during manual discharge, prevent leakage due to foreign matter biting, eliminate failure, and automatically discharge. It is a first object of the present invention to provide a float drain trap that can be easily switched between three modes: a mode, a manual discharge mode, and a closed mode.

  A second object of the present invention is to provide a float drain trap that can switch the three modes with a simple mechanism and with a small force.

  In order to achieve the first object, the float drain trap of the present invention has a drain valve for controlling the discharge of drain accumulated in the drain case attached to a piston accommodated in the cylinder, and a pilot is attached to the piston. A float type drain trap provided with a pilot valve mechanism that opens and closes a drain valve by applying air pressure, and opens and closes the pilot valve mechanism by lifting and lowering the float. The drain valve is housed inside the float drain trap. The valve body is provided so that the upper side thereof communicates with the inside of the drain case through the foreign matter intrusion prevention network, and the lower side thereof is positioned in the drain body provided continuously below the drain case, Drain bypass that bypasses the drain valve and communicates with the valve body via the foreign substance intrusion prevention network. Three modes: a drain automatic discharge mode performed via a drain valve, a drain manual discharge mode performed via a drain bypass flow path, and a closed mode by moving up and down the drain piston formed in the drain body. It is characterized in that it can be switched to.

  In this case, in order to achieve the second object, the drain piston can be moved up and down by rotating a shaft holder provided with an eccentric shaft engaged with the drain piston with a lever. .

  According to the float type drain trap of the present invention, the lower side is connected to the drain case so that the upper side of the valve body containing the drain valve is communicated with the inside of the drain case via the foreign matter intrusion prevention network. A drain bypass passage that bypasses the drain valve and that communicates with the drain case through the foreign matter intrusion prevention network is provided in the drain body that is connected to the lower side of the drain body. By the lifting and lowering operation of the drain piston accommodated in the drain body, it is possible to switch to three modes of a drain automatic discharging mode performed via the drain valve, a drain manual discharging mode performed via the drain bypass flow path, and a closing mode. By doing so, entry of foreign matter can be prevented during manual discharge, leakage due to foreign matter biting can be prevented, and failure can be eliminated.

  In addition, by rotating a shaft holder provided with an eccentric shaft that engages with the drain piston with a lever, the drain piston is moved up and down, thereby switching the three modes with a simple mechanism. Can be done with a small force.

It is sectional drawing seen from the side surface which shows one Example of the float type drain trap of this invention. The lever, shaft holder, and eccentric shaft of the float type drain trap are shown, (a) is a side view, and (b) is a bottom view. The drain piston of the same float type drain trap is shown, (a) is a front view, (b) is a side view. It is a schematic front view of the same float drain trap. Sectional drawing seen from the front in the automatic operation mode of the float type drain trap, (a) is when drain is not discharged, and (b) is when drain is discharged (explanatory view showing drain flow). It is sectional drawing seen from the front at the time of the closing mode of the float type drain trap. It is sectional drawing seen from the front at the time of manual discharge mode of the float type drain trap, (a) is a general view, (b) is explanatory drawing of the principal part which shows the flow of drain. is there. It is sectional drawing seen from the front which shows the conventional float type drain trap, (a) is a general view, (b) is explanatory drawing of the principal part which shows the flow of the drain in manual discharge mode.

  Embodiments of the float drain trap of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the float drain trap of the present invention.
In this float drain trap, a drain valve 14 for controlling the discharge of drain accumulated in the drain case 1 is attached to a piston 15 accommodated in a cylinder 16, and a pilot air pressure is applied to the piston 15 to cause the drain valve to act. 14 is a float drain trap in which a pilot valve mechanism 9 for opening and closing 14 is provided and the pilot valve 90 of the pilot valve mechanism 9 is opened and closed by lifting and lowering operation of the float 8. The upper side is provided in the drain body 2 provided so as to communicate with the lower side of the drain case 1 so that the upper side communicates with the inside of the drain case 1 through the foreign matter intrusion prevention network 11. A drain valve 14 communicating with the valve body 3 through the foreign matter intrusion prevention network 11 and in the drain case 1 is provided. The drain bypass flow path 31 is formed, and the drain piston 7 accommodated in the drain body 2 is moved up and down to automatically drain the drain through the drain valve 14. It is possible to switch to three modes, a manual discharge mode and a closed mode.

  The drain piston 7 is moved up and down by rotating the shaft holder 5 having the eccentric shaft 6 engaged with the shaft insertion hole 72 formed in the drain piston 7 by the lever 4. To be able to.

FIG. 4 is a front view of this float drain trap.
By rotating the lever 4 attached to the front, it is possible to switch between manual discharge, automatic discharge and closing of the drain. Specifically, when the lever 4 is in the center, it is automatically discharged, closed when it is rotated to the left, and manually discharged when it is rotated to the right. Further, since the lever 4 can be rotated with a small force, drain discharge management becomes very easy.

The state shown in FIG. 5 is an automatic drain discharge mode when the lever 4 is in the center.
At this time, the lever 4 is in a neutral state, the inner surface of the valve body 3 and the seal packing 12 provided on the drain piston 7 are in close contact with each other, and the seal packing 12 is in a sealed state, and is provided on the inner surface of the valve body 3 and the drain piston 7. The seal packing 13 is separated and the seal is lost.
When a certain amount of drain is accumulated in the drain case 1 from the time when the drain valve 14 in FIG. 5 (a) is in the open state and the drain is not discharged, the drain shown in FIG. As shown in the figure), when the float 8 is lifted and the pilot valve 90 of the pilot valve mechanism 9 is lifted, the valve seat 91 is opened, and the compressed air in the drain case 1 passes through the foreign matter intrusion prevention network 93. It flows into the cylinder 16 through the exhaust pipe 92. As a result, the piston 15 located above in the cylinder 16 resists the biasing force of the spring 17 and moves downward, and the drain valve 14 attached to the piston 15 moves downward accordingly. Moving.
As a result, the drain valve 14 is opened, and the drain in the drain case 1 passes through the communication passage 71 formed in the drain piston 7 via the foreign matter intrusion prevention network 11 and from the discharge port 21 of the drain body 2. Discharged.
Here, when the drain in the drain case 1 is discharged, the float 8 is lowered and the pilot valve 90 of the pilot valve mechanism 9 is lowered, whereby the valve seat 91 is closed and the balance between the compressed air and the biasing force of the spring 17 is achieved. Thus, the piston 15 located below in the cylinder 16 moves upward, and the drain valve 14 attached to the piston 15 also moves upward accordingly.
As a result, the drain valve 14 is closed and returns to the state when the drain is not discharged in FIG.

The state shown in FIG. 6 is a drain closing mode in which the lever 4 is rotated counterclockwise.
By rotating the lever 4 counterclockwise, the drain piston 7 moves upward through the shaft insertion hole 72 formed in the drain piston 7 by the eccentric shaft 6 of the shaft holder 5, and the inner surface of the valve body 3 The seal packing 12 and the seal packing 13 provided on the drain piston 7 are in close contact with each other and sealed.
As a result, as shown in FIG. 5 (b), a certain amount of drain is stored in the drain case 1, the float 8 is lifted, and the pilot valve 90 of the pilot valve mechanism 9 is lifted, so that the pilot valve mechanism 9 operates. Even if the drain valve 14 is in the open state, the seal packing 12 and the seal packing 13 provided on the drain piston 7 are in close contact with each other and are sealed. This is stopped at this position and is not discharged from the discharge port 21 of the drain body 2.

The state shown in FIG. 7 is a manual draining mode in which the lever 4 is rotated to the right.
By rotating the lever 4 to the right, the eccentric piston 6 of the shaft holder 5 moves the drain piston 7 downward through the shaft insertion hole 72 formed in the drain piston 7, and the inner surface of the valve body 3 The seal packing 12 and the seal packing 13 provided on the drain piston 7 are separated, and the seal is lost.
Thus, the drain in the drain case 1 is connected to the conduction hole 31 formed in the valve body 3 and the outer peripheral surface of the valve body 3, which constitutes a drain bypass flow path that bypasses the drain valve via the foreign matter intrusion prevention network 11. The water is discharged from the discharge port 21 of the drain body 2 through the gap with the inner peripheral surface of the drain body 2 and the communication passage 71 formed in the drain piston 7.

  In two modes, an automatic drain discharge mode performed via the drain valve 14 and a manual drain discharge mode performed via the drain bypass flow path 31, the drain in the drain case 1 is always drained via the foreign matter intrusion prevention network 11. Therefore, foreign matter can be prevented from entering during manual discharge in the manual discharge mode of the drain, leakage due to the biting of foreign matter can be prevented, and failure can be eliminated.

  Further, the shaft holder 5 having the eccentric shaft 6 that engages with the shaft insertion hole 72 formed in the drain piston 7 is rotated by the lever 4 so that the drain piston 7 is moved up and down. Switching between the two modes is possible with a simple mechanism and with a small force.

  As mentioned above, although the float type drain trap of the present invention was explained based on the example, the present invention is not limited to the composition indicated in the above-mentioned example, and the composition is suitably changed in the range which does not deviate from the meaning. Can be changed.

  As described above, the float drain trap of the present invention can prevent foreign matter from entering during manual discharge, can prevent leakage due to foreign matter biting, can eliminate failure, and has an automatic discharge mode, manual discharge mode and closed state. Since the three modes can be easily switched, it can be suitably used for a float type drain trap.

1 Drain case 2 Drain body 21 Discharge port 3 Valve body 31 Conduction hole (drain bypass flow path)
4 Lever 5 Shaft holder 6 Eccentric shaft 7 Drain piston 71 Communication path 72 Shaft insertion hole 8 Float 9 Pilot valve mechanism 90 Pilot valve 91 Valve seat 92 Exhaust pipe 93 Foreign matter intrusion prevention network 11 Foreign matter intrusion prevention network 12 Seal packing 13 Seal packing 14 Drain valve 15 Piston 16 Cylinder 17 Spring 18 Seal packing

Claims (2)

  A drain valve that controls the discharge of drain accumulated in the drain case is attached to a piston housed in the cylinder, and a pilot valve mechanism is provided to open and close the drain valve by applying pilot air pressure to the piston. In a float type drain trap that opens and closes the pilot valve of the pilot valve mechanism by lifting and lowering operation of the valve body, the drain body is housed in the drain case through the foreign matter intrusion prevention network on its upper side. In order to communicate with the inside of the drain case, the lower side of the drain case is provided so as to be positioned in the drain body, and the valve body communicates with the drain case via a foreign matter intrusion prevention network. A drain bypass passage that bypasses the drain valve is formed, and the drain piston housed in the drain body is moved up and down. Float type drain trap characterized in that it can be switched to an automatic drain discharge mode through a drain valve, a manual drain discharge mode through a drain bypass flow path, and a closed mode. .   2. The float drain trap according to claim 1, wherein the drain piston is moved up and down by rotating a shaft holder having an eccentric shaft engaged with the drain piston by a lever.

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