JP3573379B2 - Switch device for bilge pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a peripheral portion of a diaphragm that partitions the inside of the diaphragm case into a negative pressure chamber and an atmospheric pressure chamber is supported by the diaphragm case, a rod connected to the microswitch is fixed to a central portion of the diaphragm, and the outer end is closed. A spring case having an inner end communicating with the negative pressure chamber extends in the axial direction of the rod and is provided in the diaphragm case. A coil spring is contracted between the outer end closing portion and the diaphragm of the spring case, and a suction pipe of the bilge pump is provided. The present invention relates to a switch device for a bilge pump in which a connecting pipe for connecting a pipe leading to a spring is provided on a side portion of a spring receiving cylinder.
[0002]
[Prior art]
Conventionally, a bilge pump switch device in which a spring case having an outer end closed and an inner end communicating with a negative pressure chamber is provided in a diaphragm case, and a coil spring is contracted between an outer end closing portion of the spring case and the diaphragm. For example, it is already known, for example, from Japanese Utility Model Laid-Open No. 57-15052.
[0003]
[Problems to be solved by the invention]
By the way, in the negative pressure chamber formed in the diaphragm case, a negative pressure is introduced from the suction pipe of the bilge pump through a pipe such as a hose, but the pipe is not forcibly bent and is as short as possible. Due to the arrangement of pipes, it is sometimes required to connect the pipes to a connection pipe provided substantially orthogonally to the side of the spring receiving cylinder. In this case, the bilge flowing through the pipe line connected to the suction pipe of the bilge pump may contain pebbles and dust, and the coil spring disposed in the spring receiving cylinder and the connecting pipe opening in the spring receiving cylinder may be used. If the gap between the end opening is small, pebbles and dust will clog between the inner end opening of the connection pipe and the coil spring, and the negative pressure in the suction pipe will not be accurately transmitted to the negative pressure chamber, causing abnormal operation of the diaphragm. Could be.
[0004]
The present invention has been made in view of such circumstances, and when a connecting pipe to which a conduit for guiding negative pressure is connected is connected to a side portion of a spring receiving cylinder, clogging due to pebbles and dust occurs. It is an object of the present invention to provide a bilge pump switch device capable of preventing a malfunction due to clogging.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a diaphragm that partitions the inside of a diaphragm case into a negative pressure chamber and an atmospheric pressure chamber is supported by the diaphragm case, and a rod connected to a microswitch is fixed to a central portion of the diaphragm. A spring receiving cylinder having an outer end closed and an inner end connected to the negative pressure chamber extends in the axial direction of the rod and is provided in the diaphragm case, and the coil spring is compressed between the outer end closing portion of the spring receiving cylinder and the diaphragm. In a bilge pump switch device in which a connection pipe for connecting a pipe line leading to a suction pipe of the bilge pump is provided on a side of the spring receiving cylinder, a part of the side of the spring receiving cylinder is bulged outward. An enlarged portion is provided, and a communication groove that opens on the inner surface of the spring receiving cylinder and opens at the inner end of the spring receiving cylinder and extends in the axial direction is formed by the enlarged portion. Is formed, said connection tube is characterized in that it is provided continuously to the ampulla so as to communicate with the communication groove.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described based on an embodiment of the present invention shown in the accompanying drawings.
[0007]
1 to 7 show an embodiment of the present invention. FIG. 1 is a cross-sectional plan view of a switch device mounted on a bilge pump, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 1 is a view taken along the line 3-3, FIG. 4 is an enlarged view of a main part of FIG. 1, FIG. 5 is an enlarged sectional view of the line 5-5 in FIG. 1, and FIG. 7 is a sectional view taken along line 7-7 in FIG.
[0008]
First, in FIG. 1, a pump case 11 of the bilge pump P is formed in a substantially cylindrical shape from a synthetic resin and has one end connected to a motor M and the other end of the pump case main body 12 closed. And a cover plate 13. Thus, the motor M is provided with a flange 14 coupled to one end of the pump case main body 12. The cover plate 13 is coupled to the pump case main body 12 with a gasket 15 interposed between the cover plate 13 and the other end of the pump case main body 12.
[0009]
2 and 3, a pump chamber 16 into which the output shaft 17 of the motor M protrudes is formed in the pump case main body 12 so as to open at the other end of the pump case main body 12. The opening of the pump chamber 16 is closed by the cover plate 13. The peripheral wall of the pump chamber 16 has an arc-shaped peripheral wall half 16a centered on the output shaft 17 in the right half of FIG. 2 and an eccentricity with respect to the output shaft 17 in the left half of FIG. And a peripheral wall half 16b formed in an arc shape. In the pump chamber 16, a rubber impeller 18 having a plurality of, for example, six arms 18 a, which are in sliding contact with the peripheral wall of the pump chamber 16, is housed by sliding its side surfaces into contact with the inner surface of the cover plate 13. The impeller 18 is coupled to the output shaft 17 via a boss 19 inserted at the center.
[0010]
A suction pipe 20 for sucking bilge into the pump chamber 16 in accordance with the rotation of the impeller 18 in the rotation direction indicated by the arrow 23 and a bilge from the pump chamber 16 are provided on the side of the pump case main body 12. And a discharge pipe 21 extending in the horizontal direction, and a lower portion of the pump case main body 12 is provided with a trapezoidal leg portion 22 which is attached to an appropriate position of the hull and supports the pump case 11. Provided. Thus, the suction pipe 20 is connected to a suction hose 24 communicating with a bilge storage section at the bottom of the boat, and the discharge pipe 21 is connected to a discharge hose 25 opening outside the boat.
[0011]
A switch device constructed according to the present invention is attached to the pump case 11 of the bilge pump P. The switch device includes a switch box 26 coupled to the cover plate 13 of the pump case 11, and a switch box 26 inside the switch box 26. A micro switch 27 to be housed and fixed, a diaphragm case 28 coupled to the switch box 26, a diaphragm 29 whose peripheral edge is supported by the diaphragm case 28 and housed in the diaphragm case 28, a diaphragm case 28 and a diaphragm The micro switch 27 includes a spring 30 provided between the microswitches 27 and a rod 31 fixed to the center of the diaphragm 29 and connected to the microswitch 27.
[0012]
The switch box 26 has an outer diameter substantially corresponding to the outer diameter of the pump case main body 12, and is formed in a bowl shape in which the other end of a cylindrical portion 26a having one open end is closed by an end wall 26b. The gasket 32 is connected to the pump case 11 so as to interpose a gasket 32 between the opening end and the outer surface of the cover plate 13. , Which penetrate the switch box 26, the gasket 32, the cover plate 13, and the pump case main body 12 at a plurality of, for example, four places spaced apart in the circumferential direction of the pump case main body 12, are provided by the motor M The switch box 26 is connected to the pump case 11 by screwing the through bolts 33, 33.
[0013]
4 and 5, the switch box 26 has a pair of abutting support members symmetrically formed with respect to the center thereof and formed in an arc shape within a range of approximately 90 degrees and located inside the cylindrical portion 26a. The portions 34, 34 are provided integrally, and both ends of the contact support portions 34, 34 are connected to the cylindrical portion 26a. Thus, when the switch box 26 is coupled to the cover plate 13, the contact support portions 34 abut against the outer surface of the cover plate 13 at a portion corresponding to the pump chamber 16.
[0014]
Reinforcement ribs 35 are provided between the inner surface of the cylindrical portion 26a of the switch box 26 and the center of the contact support portions 34, 34, respectively. 13 is brought into contact with the outer surface of the cover plate 13 in a state of being joined to the cover plate 13. Thus, when the switch box 26 is coupled to the cover plate 13, a micro switch storage chamber 36 defined by the inner surface of the cylindrical portion 26a and the two contact support portions 34 is formed in the switch box 26. At the same time, four vacancies are formed between the inner surfaces of both the contact support portions 34, 34 and the cylindrical portion 26a. One of the empty chambers functions as a breather chamber 37, and the upper part of the breather chamber 37 is communicated with the microswitch storage chamber 36 through a communication groove 38 provided in one contact support portion 34. The lower part of the breather chamber 37 is communicated with the outside through an air flow hole 39 formed in the end wall 26b of the switch box 26.
[0015]
The micro switch 27 is housed and fixed in a micro switch housing chamber 36 with an outer shape of a rectangular box, and the micro switch 27 is fitted to an end wall 26 b of the switch box 26. The fastening support portion 40, which is formed in a substantially U-shaped cross section and has a tip end surface as a fastening surface 40a, engages with a part of one side surface of the microswitch 27 which is not covered by the fastening support portion 40. An engagement support portion 41 is protruded, and one or a plurality of support portions 42 having a front end surface as a support surface 42a protrude from a portion covered by the fastening support portion 40 and the engagement support portion 41. Is done.
[0016]
The micro switch 27 is fitted to the fastening support portion 40 and the engagement support portion 41 such that one surface 27a from which the operation element 45 projects is brought into contact with the support surface 42a, and the other surface 27b is pressed. The plate 43 abuts. Distance _{L 1} between Thus to a fastening surface 40a of the fastening support 40 and the support surface 42a of the support portion 42 is double-sided 27a of the microswitch 27, slightly smaller than the distance _{L 2} between 27b _{(L 1} <L ₂ ) is set.
[0017]
When the pressing plate 43 is in contact with the other surface 27b of the micro switch 27, the pressing plate 43 has a plurality of, for example, three fastening plate portions 43a, 43b, 43c that protrude outward from the micro switch 27 at a plurality of positions, for example, three positions. Each of the fastening plate portions 43a to 43c is fastened to the fastening surface 40a by a screw member 44.
[0018]
The micro switch 27 is provided with a pair of terminal plates 46 and 47 protruding outward from the engagement support portion 41 and a terminal plate 48 protruding outward from an opening 43 d provided in the pressing plate 43. The lead wires 49 and 50 are connected to the terminal plates 46 and 48, respectively. A grommet 52 is attached to a notch 51 provided at an open end of the switch box 26, and the two lead wires 49 and 50 are penetrated through the grommet 52 in a watertight manner and drawn out to the outside.
[0019]
The microswitch 27 is connected in parallel to a push button switch (not shown) connected to the motor M, and is in a conductive state in a state where no pressing force is applied to the operation element 45. When the operation element 45 is pushed in by the action of the pressure, the state is cut off.
[0020]
Referring also to FIG. 6, the diaphragm case 28 is connected to the case 53 by sandwiching a peripheral portion of the diaphragm 29 between the case 53 and the case 53 provided integrally with the switch box 26. And a case member 54 to be formed. The case portion 53 is formed in a dish shape which is opened outwardly by an end wall 26b of the switch box 26 and a cylindrical portion 26c integrally projecting from an outer surface of the end wall 26b. 54 is formed in the shape of a dish opened to the case 53 side. Thus, the end of the cylindrical portion 26c in the case 53 and the open end of the case member 54 are connected to each other by ultrasonic welding or the like with the peripheral edge of the diaphragm 29 interposed therebetween.
[0021]
The inside of the diaphragm case 28 is divided into an atmospheric pressure chamber 55 on the case part 53 side and a negative pressure chamber 56 on the case member 54 side by the diaphragm 29, and the atmospheric pressure chamber 55 is formed on the end wall 26 b of the switch box 26. A through hole 57 communicating with the switch storage chamber 36 is formed. A rod 31 on the side of the atmospheric pressure chamber 55 and a guide pin 58 on the side of the negative pressure chamber 56 are fixed to the center of the diaphragm 29 so as to sandwich the diaphragm 29 from both sides with these 31 and 58. The rod 31 inserted through the play 57 is brought into contact with the operator 45 of the microswitch 27.
[0022]
7, the case member 54 is provided with a spring receiving cylinder 59 having an outer end closed by an end wall 59a and an inner end communicating with the negative pressure chamber 56, coaxially with the rod 31 and the guide pin 58. The coil-shaped spring 30 surrounding the guide pin 58 is contracted between the center of the diaphragm 29 and the outer end of the spring receiving tube 59, that is, the end wall 59a.
[0023]
On the side of the spring receiving cylinder 59, there is provided an enlarged portion 59b, a part of which is bulged outward. The enlarged portion 59b opens the inner surface of the spring receiving cylinder 59 and forms the spring receiving cylinder 59. A communication groove 64 that opens in the inner end and extends in the axial direction is formed, and the connection pipe 60 is connected to the enlarged portion 59b so as to communicate with the communication groove 64. On the other hand, a connection pipe 61 is also connected to the suction pipe 20 of the bilge pump P at a substantially right angle, and both ends of a pipe 62 such as a hose are connected to the connection pipes 60 and 61.
[0024]
Next, the operation of this embodiment will be described. When the motor M of the bilge pump P is operated by a push button switch to drain the bilge accumulated on the bottom of the ship, the negative pressure generated in the suction pipe 20 acts on the negative pressure chamber 56, The diaphragm 29 bends toward the negative pressure chamber 56 against the spring force of the spring 31, and the pressing force of the rod 31 on the operation member 45 of the micro switch 27 is released, so that the micro switch 27 becomes conductive. Therefore, even if the push button switch is released and the push button switch is turned off, the power supply to the motor M is continued, and the bilge pump P continues to operate. When the bilge runs out, the suction pipe 20 sucks air, thereby reducing the negative pressure in the negative pressure chamber 56 and returning the diaphragm 29 to the atmospheric pressure chamber 55 by the spring force of the spring 31. When the rod 31 pushes the operating element 45, the micro switch 27 is shut off. Therefore, the power supply to the motor M is stopped, and the operation of the bilge pump P is stopped.
[0025]
In such a switch device of the bilge pump P, the diaphragm case 28 includes a case portion 53 provided integrally with the switch box 26 and a case member 54 coupled to the case portion 53. Is a part of the diaphragm case 28, so that the number of parts can be reduced as compared with the conventional case where the diaphragm case and the switch box are configured separately from each other.
[0026]
The switch box 26 is formed in a bowl shape opened to the pump case 11 side and is fastened to the pump case 11 with a gasket 32 interposed between the open end thereof and the outer surface of the cover plate 13. A lid for closing the box 26 is not required, and a waterproof structure can be obtained, which can also reduce the number of parts. In addition, the switch box 26 is provided with the contact support portions 34 and 34 that contact the outer surface of the cover plate 13 at a portion corresponding to the pump chamber 16, so that the cover plate 13 is prevented from expanding outward. Accordingly, the sliding state of the impeller 18 on the inner surface of the cover plate 13 can be reliably maintained. As a result, while the negative pressure in the suction pipe 20 when the outward bulge of the cover plate 13 was left was, for example, -200 mmHg, the outward bulge of the cover plate 13 as described above Is prevented, the negative pressure becomes -300 mmHg, for example, and the pump performance of the bilge pump P can be significantly improved.
[0027]
When the micro switch 27 is fixed in the switch box 26, the switch box 26 has a support portion 42 having a support surface 42a for contacting one surface 27a of the micro switch 27, and a fastening support having a fastening surface 40a at its tip. The clamping plate portions 43a to 43c of the holding plate 43, which is provided integrally with the portion 40 and is in contact with the other surface 27b of the micro switch 27, are fastened to the fastening surface 40a. both surfaces 27a of the distance _{L 1} is a micro switch 27 between the fastening surfaces 40a, it is set smaller than the distance _{L 2} between 27b. Therefore, it is possible to securely fix the microswitch 27 without play by providing the holding plate 43 with elasticity.
[0028]
By the way, when the micro switch storage chamber 36 communicating with the atmospheric pressure chamber 55 is completely closed, the pressure in the atmospheric pressure chamber 55 changes due to the volume change accompanying the displacement of the diaphragm 29, and the negative pressure operation characteristic changes. The microswitch storage chamber 36 needs to communicate with the atmosphere while preventing water from entering. From this viewpoint, in the switch box 26, a microswitch storage chamber 36 in which the microswitch 27 is stored, a microswitch storage chamber 36, and a breather chamber 37 communicating with the outside are formed. Is breathable through the breather chamber 37. Moreover, since the breather chamber 37 communicates with the micro switch storage chamber 36 at the upper part and communicates with the outside at the lower part, even if the breather chamber 37 is flooded from the outside, the breather chamber 37 is removed from the micro switch storage chamber 36. Water on the side is prevented as much as possible.
[0029]
Further, in order to minimize the length of the pipe 62 for guiding the negative pressure from the suction pipe 20 to the diaphragm case 28 without forcibly bending it, and to shorten the entire length of the bilge pump P, a spring receiving cylinder provided in the diaphragm case 28 is required. Although the pipe 62 must be connected to the side of the pipe 59, the coil-shaped spring 30 is housed in the spring receiving cylinder 59, and the spring receiving pipe 59 is connected to the spring receiving cylinder 59. If the opening end of the connection pipe 60 provided in the cylinder 59 into the spring receiving cylinder 59 is close to the spring 30, pebbles, dust, and the like in the bilge are clogged between the inner surface of the spring receiving cylinder 59 and the spring 30. As a result, normal operation of the diaphragm 29 may be difficult. However, since the communication groove 64 that communicates between the inner end of the spring receiving cylinder 59 and the connecting pipe 60 is provided on the inner side surface of the spring receiving cylinder 59, the opening between the inner end opening of the connecting pipe 60 and the spring 30 is formed. A relatively large empty space can be provided between the springs 30 to prevent the small stones and dust in the bilge from being clogged between the inner surface of the spring receiving cylinder 59 and the spring 30 as much as possible, thereby ensuring the smooth operation of the diaphragm 29. be able to.
[0030]
As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.
[0031]
【The invention's effect】
As described above, according to the present invention, a communication groove communicating between the connecting pipe and the inner end of the spring receiving cylinder is provided on the inner surface of the spring receiving cylinder, so that the inner end opening of the connecting pipe and the coil spring are connected to each other. It is possible to provide a relatively large empty space between them, minimizing the possibility of pebbles and dust in the bilge clogging between the opening at the inner end of the connection pipe and the coil spring, and the clogging may cause abnormal operation of the diaphragm. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view of a switch device attached to a bilge pump.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a view taken in the direction of arrows 3-3 in FIG. 1;
FIG. 4 is an enlarged view of a main part of FIG. 1;
FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 1;
FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 3;
FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;
[Explanation of symbols]
20, suction pipe 27, micro switch 28, diaphragm case 29, diaphragm 30, coil spring 31, rod 55, atmospheric pressure chamber 56, negative pressure chamber 59, ..Spring receiving cylinders
59b ··· Expanded part 60 ··· Connection pipe 62 · Pipe 64 · Communication groove P · Bilge pump

Claims (1)

A rod (29) that partitions the inside of the diaphragm case (28) into a negative pressure chamber (56) and an atmospheric pressure chamber (55) is supported by the diaphragm case (28), and is connected to the microswitch (27). (31) is fixed to the center of the diaphragm (29), and a spring receiving tube (59) having an outer end closed and an inner end connected to the negative pressure chamber (56) extends in the axial direction of the rod (31). A pipe provided in the diaphragm case (28) and having a coil spring (30) contracted between the outer end closing portion of the spring receiving cylinder (59) and the diaphragm (29), leading to the suction pipe (20) of the bilge pump (P). in bilge pump switch device provided on the side of the road (62) connection pipe for connecting the (60) spring receiving cylinder (59), to the side of the spring receiving cylinder (59), an outer part thereof A communication groove (64) which is provided with a bulging portion (59b) bulging toward the outside and which opens on the inner side surface of the spring receiving cylinder (59) and opens on the inner end of the spring receiving cylinder (59) and extends in the axial direction is provided. A switch device for a bilge pump, which is formed by an enlarged portion (59b) and is connected to the enlarged portion (59b) such that the connection pipe (60) communicates with the communication groove (64) .

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