JP2649042B2 - Pump venting mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pump gas release mechanism capable of suitably discharging gas in a pump chamber or the like of a pump to the outside of the pump.

(Prior Art) As is well known, when a reciprocating pump is used to feed a liquid such as sodium hypochlorite which is likely to generate a gas or a liquid in which a small amount of gas is mixed in advance, the gas is pumped. If it exists in the chamber or the discharge path, appropriate pump compression cannot be performed, and a situation may occur in which constant discharge cannot be performed. In addition, such a situation may occur even when the special liquid is not handled as described above, because air or the like in the atmosphere is sucked from the pump suction path side.

Therefore, in the prior art, for example, the one described in Japanese Patent Application Laid-Open No. 61-31680 has been developed to solve the above-mentioned difficulties.

That is, as shown in FIG. 3, this conventional one has a separate communication path with a discharge path 5e communicating with the pump chamber 1a of the reciprocating pump.
A check valve 22 using a ball 21 made of a material having a specific gravity smaller than that of the pump liquid is attached to the communication passage 18a by branching off the passage 18a. Therefore, according to this means, the ball 21 of the check valve 22 normally closes the check valve 22 by buoyancy due to a difference in specific gravity with the pumped liquid, and the gas in the pump chamber 1a and the like is discharged by the check valve. When the ball 21 reaches the position of the stop valve 22, the ball 21 descends due to its own weight, and the check valve 22 is opened, so that gas can be exhausted.

(Problems to be Solved by the Invention) However, in the means for exhausting gas by the conventional check valve 22, the ball 21 of this type of check valve 22 is processed into a highly accurate spherical surface. It is difficult to avoid a gap between the ball 21 and the valve seat of the check valve 22 because it is difficult. Since it is only abutting, the pressure contact force is very weak, and there is a problem that the check valve 22 is not completely closed.

In addition, when the pumped liquid is sodium hypochlorite or the like, the pumped liquid crystallizes at the position of the check valve 22 which comes into contact with the atmosphere. Blocking has become more difficult, and such difficulties could not be solved at all even by connecting two check valves 22 as shown in FIG.

Therefore, in the conventional means, leakage of the pump liquid from the position of the check valve 22 and pressure loss are unavoidable, resulting in a decrease in the pump discharge flow rate and a decrease in the discharge pressure. There was a fatal problem that a fixed-quantity pump liquid could not be sent, and the pump efficiency was reduced.

The present invention has been made in view of the above-described conventional problems, and has as its object to release gas from the pump chamber and the discharge passage without causing any inconvenience such as leakage of the pumped liquid. And the proper operation of the pump is made possible.

(Means for Solving the Problems) The present invention does not use a conventional valve mechanism such as a check valve, but allows only gas generated in a pump chamber or the like to permeate to the outside of the pump to prevent permeation of pumped liquid. By using a member having a blocking function, the above-described conventional problem is solved.

That is, the gist of the configuration of the present invention is that the gas vent communication portion provided in communication with the pump chamber 1 or the discharge path 5 of the pump.
18 is provided with a porous filter 13 having gas permeability and preventing liquid permeation so as to exhaust gas generated in the pump chamber 1 or the discharge path 5 to the outside of the pump. In order to store the liquid on the outside, the degassing communication part 18 is provided with a cylinder 16 having a hole 19 communicating therewith.

(Operation) Therefore, in the gas venting mechanism characterized by the above-mentioned structure, when the gas generated in the pump chamber 1 or the discharge passage 5 reaches the gas venting communicating portion 18, the gas has a gas permeability. The gas is exhausted to the outside of the pump via the porous filter 13 and the cylinder 16.

Thus, since the porous filter 13 prevents liquid permeation, the pumped liquid does not leak to the outside at all,
Therefore, only the unjustified gas is discharged to the outside without reducing the pump discharge flow rate or the discharge pressure.

In addition, a cylinder 16 having a hole 19 communicating therewith is provided in the debris communicating portion 18. When a liquid is put into the hole 19 of the cylinder 16, the liquid is filled with the porous filter 13. Therefore, even if a negative pressure is generated in the pump chamber 1 or the like, air in the atmosphere does not enter the pump via the cylinder 16 and the porous filter 13.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a diaphragm 2 which can be driven reciprocally.
The pump chamber has a check valve 3 below it.
Are provided in series. Reference numeral 5 denotes a discharge path connected to the upper side of the pump chamber 1, and the discharge path 5 extends continuously over the inside of each of the connector 7, the connection pipe 8, and the socket 9 connected to the pump head 6. A check valve 10 is provided in the discharge port 12 for piping, and two check valves 10 and 11 are provided in the middle thereof.

Reference numeral 18 denotes a vertical portion 5a of the discharge path 5 above the check valve 10.
In the upper part of the figure, there is shown a communication part for venting formed to protrude above the height level of the horizontal part 5b of the discharge path 5. Reference numeral 13 denotes a porous filter made of a tetrafluoroethylene resin alone provided on the upper side of the degassing communication portion 18, and the porous filter 13 has a large number of fine holes of about 0.1 to 10 μm on the entire surface. It is porous and has a function of transmitting air and gas, that is, air permeability, but has a water repellency to a liquid such as water to prevent the liquid from permeating. 14,1
Reference numeral 4 denotes a holding plate which holds the upper and lower surfaces of the porous filter 13. The holding plates 14, 14 are provided with a large number of through holes 15 having a diameter of several mm.

Reference numeral 16 denotes a cylinder screwed on the upper part of the connecting body 7 for positioning and fixing the holding plates 14 and 14 and the porous filter 13, and water 17 is stored in a hole 19 of the cylinder 16. .

Since the present embodiment has the above configuration, for example, a liquid for generating gas such as sodium hypochlorite is used for the diaphragm 2.
When the liquid is pumped from the inflow path 4 side to the discharge path 5 side by the reciprocating motion of the gas chamber, gas bubbles generated in the pump chamber 1 and the discharge path 5 are passed through the check valve 10 and then raised. The gas communication portion 18 at the top is reached. Since the porous filter 13 having air permeability exists on the upper surface side of the communication portion 18 for degassing, the gas permeates through the porous filter 13 and passes through the water 17 in the cylinder 16. Through
It will be exhausted to the atmosphere above it. In particular, such a gas exhausting action is promoted during the discharge step of the pump in which the pressure in the discharge passage 5 becomes high, and the higher the pump discharge pressure, the better the gas releasing action.

However, since the porous filter 13 has air permeability but does not have water permeability, the pumped liquid does not leak to the outside through the porous filter 13 and is stored in the tube 16. There is no danger that the water 17 will enter the discharge path 5. Also, during the pump suction process,
Since the check valve 10 is closed, no negative pressure is generated on the vertical portion 5a side. However, even if some trouble occurs and a negative pressure is generated on the vertical portion 5a side, the negative pressure is generated above the porous filter 13. Has water 17
Since the air is stored, it is possible to preferably prevent the air in the atmosphere from passing through the porous filter 13 due to the negative pressure and being mixed into the discharge path 5. In this case, of course, the water 17 does not enter the discharge path 5 even in this case. Further, since the water 17 is stored above the porous filter 13, direct contact between the pumped liquid and the atmosphere can be avoided, and crystallization of the pumped liquid can be prevented.

Furthermore, since the porous filter 13 is made of tetrafluoroethylene resin, it exhibits excellent corrosion resistance to chemicals such as sodium hypochlorite, and the upper and lower surfaces of the porous filter 13 have through holes. Since it is sandwiched between the holding plates 14 and 14 having 15 ..., even when the pump discharge pressure is high, the bending due to this discharge pressure is suppressed to be small, and the pressure resistance strength is also excellent. Its service life is very long.

In the above embodiment, the porous filter 13 made of tetrafluoroethylene resin having a large number of fine pores of about 0.1 to 10 μm is used.
The specific configuration is not limited to this, and its specific material, hole diameter, etc. do not matter. In short, it is only necessary to provide a filter function for preventing liquid permeation while providing air permeability. However, the porous filter 13 according to the present invention only needs to be capable of blocking the permeation of a specific type of liquid to be pumped, and does not necessarily need to have a function of preventing permeation of all types of liquid. This is because, if the porous filter 13 allows liquid such as acetone to permeate but prevents permeation of sodium hypochlorite, pumping of the sodium hypochlorite can be appropriately performed.

It should be noted that, in the above embodiment, the same action as described above can be obtained even when another type of liquid that does not pass through the porous filter 13 is stored instead of the water 17 on the outer surface side of the porous filter 13. No explanation will be needed.

Further, in the above-described embodiment, the communication section 18 for degassing and the porous filter 13 are provided downstream of the first check valve 10 on the discharge path 5 side. The basic formation, mounting position and mounting manner are not limited as described above.

That is, as shown in FIG. 2, for example, a separate branching communication part for the venting side of the first check valve 10 on the side of the pump discharge path 5 is provided.
If the porous filter 13 is provided on the side of the degassing communication portion 18 after forming the degassing communication portion 18, the discharge passage 5 may be provided in the discharge path 5 as in this embodiment.
The gas vent communication portion 18 may be directly connected to the upper portion of the pump chamber 1 or the like without connecting the holes.

In the embodiment shown in FIG. 2, a negative pressure is generated inside the porous filter 13 during the pump suction step, and air in the atmosphere outside the pump passes through the porous filter 13 and passes through the discharge path. Although there is a risk of infiltrating into the porous filter 13, as a measure for resolving this, for example, as shown in the figure, a fluid flow from the discharge passage 5 side to the porous filter 13 side is enabled before the porous filter 13 and Means such as a duckbill valve 20 having a function of blocking fluid flow in the opposite direction may be provided. With such a configuration, it is possible to preferably prevent air in the atmosphere outside the pump from passing through the duckbill valve 20 and entering the discharge path 5.
In addition, by storing a liquid such as water 17 in a cylinder 16 mounted on the outer side of the porous filter 13 in addition to or as an alternative to the duckbill valve 20. Needless to say, air can be prevented from entering the inside of the pump (note that in FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1).

As described above, in the present invention, the specific mounting position, formation state, and the like of the degassing communication portion 18 and the porous filter 13 can be arbitrarily changed in design. In short, any one of the pump chamber 1 and the discharge path 5 can be used. What is necessary is just to be provided in communication with the position.
It is not an essential requirement of the present invention that the porous filter 13 is sandwiched between the two sandwiching plates 14.

Further, the specific type of the pump is not limited to the diaphragm pump as in the above-described embodiment, but can be naturally applied to other piston pumps, plunger pumps, and the like. It does not matter, and it does not matter how the pump is used.

In addition, the specific configuration of each part of the present invention can be freely changed in design within the range intended by the present invention.

(Effects of the Invention) As described above, the present invention provides a porous filter having a function of blocking liquid passage with gas permeability in a gas vent communication portion provided in communication with a pump chamber or a discharge path. With
Since the gas generated in the pump chamber or the like can be exhausted to the outside of the pump through the porous filter, it is difficult to completely close the valve as in the case of the conventional valve mechanism for degassing. As a result, there is no possibility that the pumped liquid leaks from the valve position due to the valve position, and it is possible to completely prevent the pumped liquid from leaking to the outside through the porous filter. As a result, it is possible to appropriately eliminate gas that causes a problem in pump operation and to eliminate the liquid leakage associated therewith, so that even when handling liquids that generate gas such as sodium hypochlorite, etc. Appropriate maintenance was achieved, and an exceptional effect was obtained in which a constant volume discharge with good pump efficiency could be performed.

In addition, the present invention requires only a porous filter to be provided in the communication part for degassing, so that the conventional structure is complicated and compared with the means using a valve mechanism, in which each part must be processed with high precision. The production is extremely simple, and there is a great benefit that the production cost can be greatly reduced.

Further, the communication portion for degassing is provided with a cylinder having a hole communicating with the cylinder, and when a liquid is put into the hole of the cylinder, the liquid is stored on the outer surface side of the porous filter. Therefore, even if a negative pressure is generated in the pump chamber or the like, the air in the atmosphere does not enter the inside of the pump through the cylinder and the porous filter.
It is possible to avoid a situation in which the performance of the pump is deteriorated, and it is possible to avoid direct contact between the pump and the atmosphere due to the presence of the liquid, thereby preventing the pump from being crystallized.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a gas venting mechanism according to the present invention. FIG. 2 is a sectional view of a main part showing another embodiment. FIG. 3 is a sectional view of a main part showing a conventional example. 1 ... pump chamber, 5 ... discharge path 13 ... porous filter, 18 ... communication part for degassing

Claims (1)

(57) [Claims] An exhaust communication portion provided in communication with a pump chamber or a discharge path of a pump to discharge gas generated in the pump chamber or the discharge path to the outside of the pump. A porous filter 13 having gas permeability and preventing liquid permeation is provided, and further communicates with the degassing communicating portion 18 so as to store liquid on the outside of the porous filter 13. A gas venting mechanism for a pump, comprising: a cylinder (16) having a hole (19).