JPS63268982A - Breathing mechanism for pump - Google Patents

Abstract

PURPOSE:To enable smooth breathing by providing a porous filter having gas permeability and a function for preventing the permeation of a liquid at a breathing communication part so formed as to be continuous to a pump room or a delivery passage. CONSTITUTION:A delivery passage 5 is so made as to be continuous to the upstream of a pump room 1 internally fitted with a diaphragm 2, and a breathing communication part 18 is provided. The upper side of the breathing communication part 18 is fitted with a porous filter 13 having gas permeability but preventing the permeation of a liquid. Consequently, a pumped liquid does not leak outside and only an unnecessary gas is discharged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pump gas venting mechanism that can suitably exhaust gas in a pump chamber or the like of a pump to the outside of the pump.

(Prior Art) As is well known, when using a reciprocating pump to pump a liquid that easily generates gas, such as sodium hypochlorite, or a liquid that has been mixed with a small amount of gas, the gas If it is present in the chamber or discharge path, appropriate pump compression cannot be performed, resulting in a situation in which fixed-quantity discharge cannot be performed. Furthermore, even when the above-mentioned special liquid is not handled, such a situation may occur due to atmospheric air being sucked in from the pump suction path side.

Therefore, in order to solve the above-mentioned difficulties, a device disclosed in, for example, Japanese Patent Application Laid-open No. 31680/1983 has been developed.

That is, as shown in FIG. 3, in this conventional system, a separate communication passage 18a is branched off from the discharge passage 5e communicating with the pump chamber 1a of the reciprocating pump, and the liquid having a specific gravity smaller than that of the liquid pumped by the pump is added to the communication passage 18a. A check valve 22 using a ball 21 made of a material is installed.

Therefore, according to this means, the ball 21 of the check valve 22 normally closes the check valve 22 by the buoyancy caused by the difference in specific gravity with the liquid pumped by the pump, and also prevents the gas in the pump chamber-Ia, etc. When the ball 2 reaches the position of the check valve 22, the ball 2
1 is lowered by its own weight, the check valve 22 is opened, and as a result, gas can be exhausted.

(Problems to be Solved by the Invention) However, in the conventional means for exhausting gas by the check valve 22, the ball 2 of this type of check valve 22
It is difficult to process ball 1 into a highly accurate spherical surface, and the ball 2
1 and the valve seat of the check valve 22 is actually unavoidable, and the ball 21 only comes into contact with the valve seat due to the small buoyant force due to the difference in specific gravity between the ball 21 and the liquid pumped by the pump. Because of this, the pressure contact force is very weak and has the disadvantage that it does not completely close the check valve 22.

Moreover, when the liquid pumped by the pump is sodium hypochlorite or the like, crystallization occurs at the position of the check valve 22 where the pumped liquid comes into contact with the atmosphere. This makes it even more difficult to close the valve, and this difficulty cannot be solved even by installing two check valves 22 in series as shown in the figure.

Therefore, in the conventional means, leakage of the pumped 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. This had the fatal problem of not being able to deliver a metered amount of liquid with a pump, and also reducing the efficiency of the pump.

The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to prevent the pump chamber and discharge path from causing any inconveniences such as leakage of pumped liquid. The purpose of this invention is to allow proper degassing and thereby enable proper operation of the pump.

(Means for Solving the Problems) The present invention does not use a valve mechanism such as a conventional check valve, but rather allows only the gas generated in the pump chamber etc. to permeate to the outside of the pump, thereby reducing the permeation of pumped liquid. This structure is designed to solve the above-mentioned conventional problems by using a member having a blocking function.

That is, the gist of the configuration of the present invention is that the pump chamber 1 of the pump
Or a degassing passage 1 provided in communication with the discharge passage 5
8, a porous filter 13 is provided which has air permeability and prevents liquid permeation in order to exhaust the gas generated in the pump chamber 1 or the discharge passage 5 to the outside of the pump.

(Function) Therefore, in the gas venting mechanism characterized by the above configuration, when the gas generated in the pump chamber l or the discharge passage 5 reaches the gas venting passage 18, the gas loses its permeability. It passes through the porous filter 13 provided and is exhausted to the outside of the pump. Since the porous filter 13 prevents the permeation of liquid, the liquid pumped by the pump does not leak to the outside, and therefore, the pump discharge flow rate does not decrease or the discharge pressure decreases unduly. This means that only the gas that is present is exhausted to the outside.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

, In Fig. 1, 1 is a diaphragm 2 that can be driven reciprocally.
is installed inside the pump chamber, and a check valve 3 is installed on the lower side of the pump chamber.
An inflow channel 4 with a 100 mA is provided in series.

Reference numeral 5 denotes a discharge passage connected to the upper side of the pump chamber 1, and the discharge passage 5 extends continuously inside each of the connecting body 7 connected to the pump head 6, the connecting vibe 8, and the socket 9. The pipes reach the piping outlet 12, and two check valves to and ti are provided in the middle.

Reference numeral 18 denotes a degassing connecting part formed at the upper part of the vertical part 5a of the discharge passage 5 above the check valve 10 so as to protrude above the height level of the horizontal part 5b of the discharge passage 5. shows. Reference numeral 13 indicates a porous filter made of tetrafluoroethylene resin, which is provided on the upper side of the gas venting connection part 18, and the porous filter 13 is coated with O01 to O1 on its entire surface.
It is a porous material with many fine pores of about 0 μm, and has the function of allowing air and gas to pass through, that is, has breathability, but exhibits ↑R aqueous properties when it comes to liquids such as water, and prevents their permeation. It is. 14.14 is the porous filter 13
This shows a clamping plate formed by sandwiching the upper and lower surfaces of the clamping plate 14.
14 is provided with a large number of through holes 15 of several diameters.

16 is the holding plate 14.14 and the porous filter 13;
A cylinder is screwed onto the upper part of the connecting body 7 to position and fix the cylinder 16.
7 are stored.

Since this embodiment has the above configuration, when a liquid that generates gas, such as sodium hypochlorite, is pumped from the inflow path 4 side to the discharge path 5 side by the reciprocating motion of the diaphragm 2, , the gas bubbles generated in each part of the pump chamber 1 and the discharge passage 5 pass through the check valve 10 and rise, and then rise to the vertical part 5a.
It reaches the gas vent communication part 18 at the top of the. Since a porous filter 13 having air permeability is present on the upper surface side of the gas vent communication section 18, the gas passes through this porous filter 13 and enters the water 1 in the cylinder 16.
7 and is exhausted into the atmosphere above. Particularly, such a gas evacuation effect is promoted during the pump discharge process when the pressure inside the discharge passage 5 is high, and the higher the pump discharge pressure, the better the gas evacuation effect becomes.

However, since the porous filter 13 has air permeability but not water permeability, the pumped liquid does not leak to the outside through the porous filter 13 and is stored in the pipe body 16. There is no fear that the water 17 will enter the discharge passage 5. Further, during the pump suction process, the check valve 10 is closed, so no negative pressure is generated on the vertical portion 5a side, but some kind of hindrance occurs and negative pressure is generated on the vertical portion 5a side. Even if the porous filter 13
Since the water 17 is stored above the discharge passage 5, it is possible to prevent atmospheric air from passing through the porous filter 13 and being mixed into the discharge passage 5 due to the negative pressure.

Of course, even in this case, the water 17 will not enter into the discharge passage 5. Furthermore, the porous filter 1
By storing the water 17 above the pump 3, direct contact between the pumped liquid and the atmosphere can be avoided, and crystallization of the pumped liquid can also be prevented.

Furthermore, since the porous filter 13 is made of tetrafluoroethylene resin, it exhibits excellent corrosion resistance against chemical solutions such as sodium hypochlorite.
is a clamping plate 14. having through holes 15 on its upper and lower surfaces.
14, even when the pump discharge pressure is high, the deflection due to this discharge pressure is suppressed to a small level, and it has excellent pressure resistance and has a very long service life. becomes.

In the above embodiment, a porous filter 13 made of tetrafluoroethylene resin having a large number of micropores of about 0.1 to 10 μm is used, but the specifics of the porous filter 13 according to the present invention are The structure is by no means limited to this, and the specific material, hole diameter, etc. are not in question. In short, it is sufficient to have a filter function that prevents permeation of liquid while providing breathability. However, it is sufficient that the porous filter 13 according to the present invention can block the permeation of a specific type of liquid pumped, and it is not necessarily necessary to have the function of blocking the permeation of all types of liquid. This is because if the porous filter 13 allows liquids such as acetone to pass therethrough but blocks sodium hypochlorite from passing through, the sodium hypochlorite can be pumped appropriately.

Further, in the above embodiment, the water 17 is stored in the upper part of the porous filter 13, and atmospheric air flows into the pump discharge path 5.
Although the present invention is intended to prevent water 17 from inadvertently entering the interior of the porous filter 13 and from crystallizing pumped liquid such as sodium hypochlorite, the present invention does not necessarily require water 17 to be placed on the outer surface of the porous filter 13 as in the above embodiment. There is no need to store it. For example, in the embodiment shown in FIG. 1, if the check valve 10 is almost completely closed during the pump suction process and no negative pressure is applied inside the porous filter 13, water 17 is present. Even if this is not done, atmospheric air will not enter into the discharge passage 5, and it can be put to practical use. In addition, in the above embodiment, even if another type of liquid that does not pass through the porous filter 13 is stored instead of the water 17 on the outer surface of the porous filter 13, the same effect as described above can be obtained. No explanation needed.

Furthermore, in the above embodiment, the degassing communication portion 18 and the porous filter 13 are provided on the downstream side of the first check valve 10 on the discharge path 5 side, but the present invention does not require these specific features. The formation, mounting position, and mounting manner are by no means limited to the above.

That is, for example, as shown in FIG.
There is nothing wrong with forming a separate branch-shaped gas vent communication section 18 on the upstream side of the check valve 10 and providing the porous filter 13 on the side of the gas vent communication section 18. However, instead of providing the communication part 18 for degassing in the discharge passage 5 as in the embodiment, the communication part 18 for degassing may be directly provided in the upper part of the pump chamber 1 or the like.

In the embodiment shown in FIG. 2 above, negative pressure is generated inside the porous filter 13 during the pump suction process, and air in the atmosphere outside the pump passes through the porous filter 13 and flows into the discharge path. However, as a measure to eliminate this problem, for example, as shown in the same figure, fluid can flow from the discharge path 5 side to the porous filter 13 side at the stage before the porous filter 13, and this can be avoided. A means such as a duckbill valve 20 having a function of preventing fluid flow in the opposite direction may be provided. With such a configuration, it is possible to suitably prevent air in the atmosphere outside the pump from passing through the duckbill valve 20 and entering the discharge passage 5. Additionally, in addition to or in place of the duckbill valve 20, it is also possible to store a liquid such as water 17 in a cylinder 16 attached to the outside of the porous filter 13, so that the outside of the pump can be removed. Of course, it is possible to prevent air from entering the inside of the pump (note that the same reference numerals in FIG. 2 as in FIG. 1 indicate the same parts as in FIG. 1).

As described above, in the present invention, the specific mounting position and formation state of the degassing communication section 18 and the porous filter 13 can be changed as desired; It suffices if it is provided in communication with the position. Note that the porous filter 13 is held between two sheets Fj, 14.
14 is not an essential requirement of the present invention.

Furthermore, the specific type of pump of the present invention is by no means limited to the diaphragm pump as in the above embodiment, but can of course be applied to other piston pumps, plunger pumps, etc., and the specific type and structure thereof are subject to change. In addition, it does not ask how the pump is used.

In addition, the design of the specific configuration of each part of the present invention can be changed within the intended scope of the present invention.

(Effects of the Invention) Like the ridges, the present invention provides a gas vent communication section provided in communication with the pump chamber or the discharge path, which has a porous structure that has air permeability and has the function of blocking liquid permeation. Set up a filter,
Since the gas generated in the pump chamber etc. can be exhausted to the outside of the pump through a porous filter, it is difficult to completely close the valve, unlike the conventional method of venting gas using a valve mechanism. There is no risk of liquid pumped by the pump leaking from the valve position due to this, and it is completely possible to prevent pumped liquid from passing through the porous filter and leaking to the outside. As a result, it is possible to properly remove gases that interfere with pump operation and eliminate liquid leakage, and to reduce the pump discharge flow rate and discharge pressure even when handling liquids that generate gas such as sodium hypochlorite. Proper maintenance has been achieved, and a special effect has been achieved in that it is possible to perform quantitative discharge with good pump efficiency.

Moreover, since the present invention only requires providing a porous filter in the gas venting communication section, compared to the conventional means using a valve mechanism, which has a complicated structure and requires high-precision processing of each part, The parts are manufactured by a large number of parts, and the manufacturing cost can be significantly reduced. It also has great practical benefits.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of a gas venting mechanism according to the present invention. - Fig. 2 is a cross-sectional view of main parts showing another embodiment. FIG. 3 is a sectional view of main parts showing a conventional example. l...Pump chamber 5...Discharge path 13...
・Porous filter 18...Communication part for gas venting Applicant: Nippon Feeder Industries Co., Ltd. Agent Patent attorney Noboru Fujimoto Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1 Gas generated in the pump chamber 1 or discharge passage 5 is exhausted to the outside of the pump through a gas venting communication portion 18 provided in communication with the pump chamber 1 or discharge passage 5 of the pump. A gas venting mechanism for a pump, characterized in that it is provided with a porous filter 13 that has air permeability and prevents liquid permeation. 2. The pump gas venting mechanism according to claim 1, wherein the porous filter 13 is provided on the front side of a cylinder 16 having holes 19 so as to be able to store water 17 on the outside thereof.