JP4348304B2 - Waterproof blower - Google Patents

Description

  The present invention relates to a waterproof blower, and more particularly, to a waterproof blower that can prevent moisture from entering into the blower or has improved waterproof performance.

  As environmental issues are emphasized, septic tanks for purifying sewage, which is a valuable water resource, have become widespread. This septic tank includes, for example, a sedimentation separation tank to which sewage is supplied, a contact aeration tank to which sewage from which solids and the like have been removed is supplied, and a microorganism that has purified sewage in the contact aeration tank And a disinfectant of the supernatant water formed in the settling tank is discharged to the outside as water after purification treatment. Purification of sewage in the contact aeration tank is performed by causing aerobic microorganisms attached to the surface of the contact filter medium provided inside to propagate in aeration air and decomposing organic matter into the aerobic microorganisms. . For this reason, the septic tank is provided with a blower for sending aeration air to the contact aeration tank.

By the way, since the blower as described above is often used outdoors including a use for a septic tank, an air pump generating compressed air must be protected from moisture and dust in the outside air. Conventionally, the structure which covered the said air pump with the casing is known with respect to this subject, for example, in patent document 1 by this applicant, the air pump was accommodated in the box-shaped casing divided into 2 parts up and down. A blower is disclosed.
JP 2004-316447 A

  However, in the blower casing structure of Patent Document 1, if the air filter provided in the vicinity of the outside air intake port increases the suction resistance due to contamination or the like, the amount of air sucked by the air pump inside the casing is unchanged. In addition, the inside of the casing may become a pressure (negative pressure) lower than the atmospheric pressure than expected. At this time, if the sealing members provided at the upper and lower casing joints have deteriorated due to aging, etc., the outside air will be sucked in from locations where the sealing capability is insufficient. Of course, if the deteriorated part is in an environment in contact with moisture, the moisture is also sucked in. If such moisture intrusion continues, there is a possibility that the air pump, its electrical wiring, etc. may be defective.

  An object of the present invention is to solve the above-described problems of the prior art and provide a waterproof blower capable of preventing moisture from entering the blower or improving the waterproof performance.

  In order to achieve the above-described object, the present invention provides an air pump that discharges air sucked from a suction port as compressed air from a discharge port, and houses the air pump and is connected to an intake port for outside air and a discharge port of the air pump. In the waterproof blower having a casing having a discharge port, a communication path directly connecting the suction port of the air pump and the outside air suction port of the casing, and a part of the compressed air discharged from the air pump The first feature is that it has a communication hole to be discharged inside.

  The air pump includes suction side and discharge side valve means for preventing backflow of the compressed air, and the communication hole includes the air passage from the outside air suction port of the casing to the discharge port of the casing. A second feature is that it is provided at a location communicating with the downstream air passage of the discharge side valve means and the inside of the casing.

  The communication hole has a third feature in that the communication hole is provided on an air pump wall surface on the downstream side of the valve means on the discharge side.

  Further, an air tank for reducing pulsation of discharged air is connected to the downstream side of the valve means on the discharge side of the air pump, and the communication hole is connected to a connection portion between the discharge port of the air pump and the suction port of the air tank. The fourth feature is that it is provided.

  The communication hole has a fifth feature in that the communication hole is a gap formed by a pinhole and a rib or a groove provided on the wall surface of the discharge port of the air pump or the suction port of the air tank.

  A sixth feature is that the pressure inside the casing is higher than the atmospheric pressure when the air pump is driven.

  Further, the casing can be divided into at least two, and a waterproof means that is separate from the casing and shaped along the divided surface is not sandwiched between the divided casings. The point has the seventh feature.

  According to invention of Claim 1 and 2, since the pressure inside a casing is raised with the compressed air of an air pump, waterproof performance can be improved significantly. Further, since the waterproof performance is obtained by using the compressed air of the air pump, even if the casing sealing structure is deteriorated, the waterproof performance is not greatly affected. Accordingly, the sealing structure can be simplified as compared with the prior art.

  According to the third to fifth aspects of the invention, the degree of freedom in installing the communication hole is increased, so that the communication hole can be easily installed. Along with this, production costs can be reduced.

  According to the invention of claim 6, since the inside of the casing becomes higher than the atmospheric pressure, moisture does not enter the casing even under heavy rain or in an environment such as a hot and humid rainy season.

  According to the seventh aspect of the present invention, since there is no gasket or the like as a waterproof means on the dividing surface of the casing, the production cost can be reduced by reducing the number of parts.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a waterproof blower to which the present invention is applied. The waterproof blower 1 is configured such that an air pump 6 that is a source of compressed air is housed in a box-like space formed by an upper casing 2 and a lower casing 4 made of a thin plate such as a synthetic resin. When the air pump 6 starts to be driven by the power supplied from the power cord 7, the waterproof blower 1 sucks outside air A from the suction port provided in the vicinity of the air cleaner cover 3 and is provided in the lower casing 4. Compressed air D is sent out from the discharge port 5. The perspective view of FIG. 1 is also common to the conventional waterproof blower, and the configuration of the conventional waterproof blower will be described below before entering the description of the present invention.

  FIG. 7 shows a partial cross-sectional view of a conventional waterproof blower 100. The same reference numerals as above represent the same or equivalent parts. A suction port 2a for sucking outside air A is provided on the ceiling wall surface of the upper casing 2, and an air cleaner 3a for filtering the sucked outside air is disposed above the suction port 2a. The air cleaner cover 3 is configured to widely cover the periphery of the air cleaner 3a so that water droplets, sand, and other foreign matters that do not float in the air do not directly touch the air cleaner 3a. The introduced air B1 sucked from the suction port 2a is introduced into the pump chamber 13 from the suction port 6a of the air pump 6 through the inside I of the casing. In the air pump 6, a piston 10 slidable in the horizontal direction shown in the figure is housed in a cylindrical cylinder 15. This is a known electromagnetic air pump that reciprocates by a fixed electromagnet (not shown) to increase the pressure in the pump chamber 13 and discharge compressed air from the discharge port 6b. Opening and closing of the intake valve 11 and the discharge valve 12 for preventing the backflow of air is automatically performed following the pressure fluctuation generated in the pump chamber 13. The air tank 14 that supports the air pump 6 with rubber legs 20 for vibration isolation is a rectangular parallelepiped chamber for reducing pulsation of discharge air generated by the reciprocating motion of the piston 10, and is provided from the discharge port 6 b. The discharged compressed air is guided to the air tank 14 through the connecting member 25 and the suction port 14a. The accumulated air C with reduced pulsation in the air tank 14 is discharged from the discharge port 5 as compressed air D to be supplied to the septic tank or the like through the discharge port 14b, the connecting member 26, and the suction port 5a of the lower casing 4. The

  The upper casing 2 and the lower casing 4 are joined by a plurality of bolts (not shown) with a gasket 21 serving as a sealing member sandwiched between their joint surfaces. The lead-out portion of the wiring cord 7 is hermetically sealed by a bush 22 made of PVC (vinyl chloride resin) or the like. The rubber leg hole provided on the bottom surface of the lower casing 4 is also fitted with the rubber leg 24 having a fitting part slightly larger in diameter than the inner diameter thereof, and further the support member 23 for supporting the air tank 14. By sandwiching the bottom surface of the lower casing 4, a sealing effect equivalent to that of the gasket 21 is obtained. That is, the outside air is not sucked when the waterproof blower 100 is in operation, except from the suction port 2 a provided in the ceiling portion of the upper casing 2. At this time, if the intake air amount of the air pump 6 is larger than a certain level, a slight negative pressure is generated in the casing I due to the suction resistance generated in the suction port 2a and the air cleaner 3a. There is no particular problem because it has.

  However, if the intake resistance increases due to the air cleaner 3a being soiled or the like, the negative pressure in the casing I may increase depending on the degree. Furthermore, at this time, if the above-described sealed structure has deteriorated due to secular change or the like, a situation occurs in which outside air and moisture are sucked from a portion that cannot withstand the increased negative pressure. The configuration of the present invention for solving this problem will be described below.

  FIG. 2 is a partial cross-sectional view of the waterproof blower 1 according to the first embodiment of the present invention. The same reference numerals as above represent the same or equivalent parts. The main difference from the above-described conventional waterproof blower 100 is that a tube 27 as a communication path and a pinhole 28 as a communication hole are added.

  The tube 27 connects the suction port 2a provided in the upper casing 2 and the suction port 6a of the air pump 6 to directly supply the introduction air B2 to the air pump 6 without passing through the inside I of the casing. is there. The tube 27 prevents the air pump 6 from sucking the air in the casing I, so that no negative pressure is generated in the casing I. The pinhole 28 is a communication hole provided in the wall surface of the air pump 6 so as to communicate with the inside I of the casing on the downstream side of the discharge valve 12. By providing the pinhole 28, a part of the compressed air generated by the air pump 6 is discharged into the casing I as the casing discharge air E, so that the pressure in the casing I is always higher than the atmospheric pressure ( Positive pressure, for example, 15 kPa). The pinhole 28 can have a diameter of, for example, about 1 mm, but only the time until the inside I of the casing reaches a predetermined positive pressure varies even when the diameter is changed, which will be described later. The improvement in waterproof performance is unchanged.

  With the above configuration, when the inside I of the casing shows a positive pressure, even if a defect occurs in the sealing structure and a slight gap is formed, only compressed air leaks from the gap to the outside of the casing. The outside air and moisture are not sucked into the casing I. That is, the waterproof / sealing performance is dramatically improved without changing the conventional sealing structure. This eliminates the need for high performance in the above-described sealed structure, and in the waterproof blower 1 of the embodiment, the gasket between the upper casing 2 and the lower casing 4 can be eliminated. Further, the bush 22 of the wiring cord 7 can also have a simpler configuration than that used in the conventional waterproof blower 100.

  The pinhole 28 may be disposed so as to communicate with the inside I of the casing on the downstream side of the discharge valve 12 in the air passage of the waterproof blower 1. Is possible.

  In FIG. 3, the structure of the communicating hole in the waterproof blower 1 which concerns on 2nd Embodiment of this invention is shown. The figure is an enlarged view of the connection portion between the discharge port 6b of the air pump 6, the pipe-like connection member 25, and the suction port 14a of the air tank 14. In this embodiment, a pinhole 30 as a communication hole is provided in the wall surface of the discharge port 6b, and the discharge air E in the casing, which is part of the compressed air, is discharged from the pinhole 30 into the casing I. The

  In FIG. 4, the structure of the communicating hole in the waterproof blower 1 which concerns on the modification of 2nd Embodiment of this invention is shown. The same reference numerals as above represent the same or equivalent parts. FIG.4 (b) is FF sectional drawing of the same (a). The communication hole is not limited to the circular hole as described above. In the present embodiment, the communication hole is formed by the rib 31 along the air passage direction on the outer peripheral surface of the discharge port 6b. The rib 31 has an upper end portion that is substantially the same as or above the upper end portion of the connecting member 25, and one lower end portion that is the same as or substantially the same as the lower end portion of the discharge port 6b. Therefore, if the connecting member 25 is made of flexible rubber, synthetic resin or the like, the inner peripheral surface of the connecting member 25 is deformed by the ribs 31, and the gap 32 formed thereby acts as the communication hole. Can be made.

  In FIG. 5, the structure of the communicating hole in the waterproof blower 1 which concerns on the 2nd modification of 2nd Embodiment of this invention is shown. The same reference numerals as above represent the same or equivalent parts. FIG.5 (b) is GG sectional drawing of the same (a). In the present embodiment, a groove 33 is provided along the flow path direction on the outer peripheral surface of the discharge port 6b. The groove 33 has an upper end positioned substantially the same as or above the upper end of the connecting member 25, and one lower end thereof is the same as the lower end of the discharge port 6b. The formed gap 34 functions as the communication hole. 3 to 5, the pinhole 30, the rib 31 and the groove 33 are provided on the wall surface of the discharge port 6b. However, these may be provided on the wall surface of the suction port 14a of the air tank 14.

  In FIG. 6, the structure of the communicating hole in the waterproof blower 1 which concerns on 3rd Embodiment of this invention is shown. The same reference numerals as described above represent the same or equivalent parts. In the embodiment, a pinhole 35 as the communication hole is provided in the connecting member 25. According to this configuration, the communication hole can be provided by a simple change of parts. The communication hole may be configured such that a rib or a groove is provided on the inner peripheral surface of the connecting member 25, or may be provided in another suction port, a discharge port, or the like located on the downstream side of the discharge valve 12. Of course.

  As described above, according to the waterproof blower of the present invention, the inside of the casing can always be maintained at a pressure (positive pressure) higher than the atmospheric pressure, so that the waterproof performance is dramatically improved. Moisture does not enter the inside of the casing even in an environment such as a humid rainy season. Further, since the waterproof performance is obtained by using the compressed air generated by the air pump, the waterproof performance is not greatly affected even if the sealing structure is deteriorated. In addition, the installation of the communication path and the communication hole is easy, and the casing sealing structure using a gasket, a bush, or the like can be simplified as compared with the conventional one, so that the production cost of the blower can be reduced. In the above embodiment, the air pump has been described as a piston type pump, but the air pump may be a diaphragm type pump or the like. For example, a plurality of pinholes as communication holes may be provided on the wall surface of the air pump 6, or may be provided at a plurality of sites so as to be provided on the wall surface of the air pump 6 and on the outer peripheral surface of the discharge port 6b. .

1 is a perspective view of a waterproof blower according to an embodiment of the present invention. It is a partial sectional view of a waterproof blower concerning one embodiment of the present invention. It is a schematic explanatory drawing of the communicating hole of the waterproof blower which concerns on 2nd Embodiment of this invention. It is the schematic explanatory drawing and the FF line sectional view of the communicating hole of the waterproof blower concerning the modification of a 2nd embodiment of the present invention. It is the schematic explanatory drawing of the communicating hole of the waterproof blower which concerns on the 2nd modification of 2nd Embodiment of this invention, and GG sectional drawing. It is a schematic explanatory drawing of the communicating hole of the waterproof blower which concerns on 3rd Embodiment of this invention. It is a partial cross section figure of the waterproof blower by a conventional system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Waterproof blower, 2 ... Upper casing, 2a ... Suction port, 4 ... Lower casing, 5 ... Discharge port, 6 ... Air pump, 10 ... Piston, 11 ... Suction valve, 12 ... Discharge valve, 13 ... Pump chamber, 14 ... Air tank, 15 ... Cylinder, 21 ... Gasket, 22 ... Bush, 27 ... Tube, 28 ... Pinhole

Claims (7)

An air pump that discharges air sucked from the suction port as compressed air from the discharge port;
In a waterproof blower that houses the air pump and includes a casing having a suction port connected to the outside air suction port and the discharge port of the air pump,
A communication path directly connecting the suction port of the air pump and the outside air suction port of the casing;
A waterproof blower having a communication hole for discharging a part of the compressed air discharged from the air pump into the casing. The air pump comprises suction side and discharge side valve means for preventing backflow of the compressed air,
The communication hole is provided at a location communicating with the inside of the casing and the downstream air passage of the valve means on the discharge side in the air passage from the outside air inlet of the casing to the outlet of the casing. The waterproof blower according to claim 1.   The waterproof blower according to claim 2, wherein the communication hole is provided on a wall surface of an air pump on the downstream side of the valve means on the discharge side. An air tank for reducing pulsation of discharged air is connected to the downstream side of the valve means on the discharge side of the air pump,
The waterproof blower according to claim 2, wherein the communication hole is provided at a connection portion between a discharge port of the air pump and a suction port of the air tank.   The waterproof blower according to claim 4, wherein the communication hole is a pinhole provided in a wall surface of a discharge port of the air pump or a suction port of the air tank, and a gap formed by a rib or a groove.   The waterproof blower according to any one of claims 1 to 5, wherein a pressure inside the casing is higher than an atmospheric pressure when the air pump is driven.   The casing can be divided into at least two, and a waterproof means that is separated from the casing and shaped along the divided surface is not sandwiched between the divided casings. The waterproof blower according to any one of claims 1 to 6.

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