JP4536188B2 - Waterproof motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a waterproof motor in which an output shaft is submerged in liquid, such as a pumping motor of an electric pump.
[0002]
[Prior art]
Two types of conventional waterproof motors are known: a type in which the motor is housed in a plastic container and sealed with an adhesive, and a type in which rubber is cast around the motor. As shown in FIG. 3, the adhesive sealing type includes a fixed container 12 that houses the motor 13, a seal member 14 that is made of rubber, seals the opening of the container 12, and penetrates the output shaft of the motor 13 in a liquid-tight manner. And an adhesive 15 for fixing the seal member 14 to the opening of the container 12. This type of waterproof motor is manufactured through a process in which the adhesive 15 is poured into a space surrounded by the container 12 and the seal member 14.
[0003]
[Problems to be solved by the invention]
However, it is difficult to automate the adhesive pouring operation with a machine. Moreover, it cannot send to the following process until an adhesive agent dries. Therefore, the manufacturing cost was high. Furthermore, poor adhesion may be accompanied by poor sealing. On the other hand, the casting mold type is inferior in waterproofness because it is difficult to mold the rubber so as to be in close contact with the motor due to the elasticity of the rubber and the complexity of the shape of the lead attachment portion.
Therefore, an object of the present invention is to provide a waterproof motor that is inexpensive and excellent in waterproofness.
[0004]
[Means for Solving the Problems]
In order to achieve the object, the waterproof motor of the present invention is
A motor,
A container that has an opening, and stores the motor so that the output shaft of the motor protrudes from the opening;
It is made of an elastic material and has an outer diameter that is almost the same as the inner diameter of the opening, and a hole through which the output shaft passes in a liquid-tight manner and an annular valve having a diameter larger than the inner diameter of the opening are formed on the outer peripheral surface. A seal member applied to the shaft side end surface;
It has a plate shape that can be press-fitted into the opening, has a hole for inserting an output shaft, and includes a lid that can compress the seal member in the thickness direction in cooperation with the output shaft side end surface of the motor. Features.
[0005]
According to the waterproof motor of the present invention, when the lid is press-fitted into the opening of the container while the motor is accommodated in the container, the lid compresses the seal member in the thickness direction in cooperation with the output shaft side end surface of the motor, The seal member is elastically deformed and expanded in the centrifugal direction. As a result, the back surface of the sealing member is pressed against the output shaft side end surface of the motor to prevent the inflow of liquid along the output shaft, and the valve is pressed against the inner periphery of the container so that the liquid flows from the opening edge. To prevent.
Thus, the motor is sealed in the container. Since it is sufficient to fix the seal member by press-fitting the lid, it can be easily automated and does not take much time.
[0006]
The container has an annular groove formed on the inner periphery between the output shaft side end surface of the motor and the opening, and the lid has a claw protruding from the outer peripheral surface so as to fit into the groove when press-fitted. To do . When the lid is press-fitted to the position where the claw fits into the groove, the movement in the press-fitting direction is stopped by the fitting between the claw and the groove. Therefore, the press-fitted lid is unlikely to come off from the container, and the seal is ensured.
[0007]
Furthermore, it is preferable that the seal member has an annular recess on the surface, and the lid has an annular protrusion on the back surface that faces the recess and is narrower than the recess. Since the projection is narrower than the recess, the portion of the back surface of the lid that presses the seal member is limited to the tip surface of the projection, increasing the compression force. Moreover, since the protrusion is annular, the compressive force is evenly applied to the seal member.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the waterproof motor of the present invention is shown as an axial cross-sectional view in FIG. The waterproof motor 10 includes a cylindrical motor 3 having a screw 6 attached to the output shaft, a container 2 that houses the motor 3, and a cord that is soldered to the input terminal of the motor 3 and is output from the rear of the container 2 to the outside. 1, a cord packing 7 that seals the gap between the rear portion of the container 2 and the coat 1, a sealing material 4, and a lid 5. A sectional view in the axial direction of the sealing material 4 alone is shown in FIG.
[0009]
The container 2 has a smaller inner diameter behind the motor 3 housing, and the stop position of the rear end of the motor 3 in the container 2 is determined by the step 21 due to the difference in diameter. The motor 3 housing portion of the container 2 has a substantially uniform inner diameter in the axial direction, but an annular groove 22 is formed on the inner periphery at a position slightly away from the opening edge, and only a small inner diameter is formed at that portion. large. The material of the container 2 is polyacetal (POM).
[0010]
The seal material 4 is applied to the output shaft side end surface of the motor 3 to seal the front portion of the container 2 in a liquid-tight manner, and is made of a rubber material such as NBR, and has a hole 41 through which the output shaft passes in the center. In plan view, the container 2 has a circular shape having an outer diameter substantially the same as the inner diameter of the container 2. In the cross-sectional view, the sealing material 4 includes an annular valve 42 formed to project radially outward on the outer peripheral surface, an annular recess 43 formed on a surface slightly inside the outer edge, and an output shaft on the inner side. And a lip 45 formed so that the peripheral edge of the hole protrudes forward following the raised portion 44. The hole 41 has an inner diameter that decreases toward the tip of the lip 45, and the inner diameter at the tip is smaller than the outer diameter of the output shaft. A gap between the base of the lips 45 and the output shaft is filled with silicon oil 8. Further, the lips 45 become thinner toward the tip. Therefore, when the output shaft is passed through the hole 41, the lips 45 are brought into close contact with the output shaft by its elasticity.
[0011]
The lid 5, together with the container 2, fixes the sealing material 4 to the output shaft side end surface of the motor 3. The lid 5 has a hole 51 in the center for fitting the raised portion 44 and protrudes so as to complement the groove 22. An annular claw 52 is formed on the outer periphery, and an annular projection 53 that contacts the bottom of the recess 43 is formed on the back surface. The width of the protrusion 53 is smaller than the width of the recess 43, and the protrusion 53 is formed so as to be located as far as possible in the recess 43. Further, the height of the protrusion 53 is such that when the claw 52 is just engaged with the groove 22, the distance between the tip surface of the protrusion 53 and the output shaft side end surface of the motor 3 is the same as the thickness of the recess 43 of the sealing material 4. It is set to be as follows. Therefore, when the projection 5 presses the bottom of the recess 43 by press-fitting the lid 5 into the space surrounded by the seal material 4 and the container 2, the seal material 4 is compressed at the tip surface of the projection 53, and the projection The outer edge of the sealing material 4 is pressed against the inner periphery of the container 2 at the side surface 53.
[0012]
The procedure for assembling this waterproof motor is the same as the conventional process until the motor 3 and the lead 1 are soldered and the motor 3 is housed in the container 2, but thereafter the sealing material 4 is applied to the output shaft side end surface of the motor 3. Subsequently, it is only necessary to press-fit the lid 5 into the container 2. Moreover, at the time of press-fitting, the lid 5 is elastically deformed in a direction to reduce the outer diameter, and then the claw 52 is engaged with the groove 22 while the outer diameter is restored by a restoring force. This engagement prevents the lid 5 from coming off after press-fitting.
[0013]
According to this waterproof motor, since the lid 5 is fixed to the container 2 simply by pushing the lid 5 into the container 2, the attaching operation of the lid 5 can be automated by a machine. Since the assembly is completed simultaneously with the press-fitting of the lid 5, it can be manufactured in a short time. Since the protrusion 53 presses the bottom of the recess 43 of the sealing material 4 in the state where the lid 5 is press-fitted, the back surface of the sealing material 4 is pressed against the output shaft side end surface of the motor 3 and the sealing material 4 is elastically deformed. Then, it is expanded in the centrifugal direction, and its outer peripheral surface is in pressure contact with the inner peripheral surface of the container 2. Moreover, since the valve 42 protrudes from the outer peripheral surface, the contact pressure at that portion is high and liquid tightness is maintained. On the other hand, since silicon oil is filled in the gap between the lips 45 and the output shaft, liquid does not enter the motor along the output shaft. Therefore, the motor is inexpensive and excellent in waterproofness.
[0015]
【The invention's effect】
As described above, since the waterproof motor of the present invention can be assembled by a simple process, the manufacturing can be automated by a machine and the waterproof property is excellent. For example, an electric pump for outdoor showers, such as a poly tank It is useful as a driving source for pumping water from the mobile tank.
[Brief description of the drawings]
FIG. 1 is an axial sectional view showing a waterproof motor according to an embodiment.
FIG. 2 is an axial sectional view showing a sealing material used in the waterproof motor.
FIG. 3 is an axial sectional view showing a conventional waterproof motor.
[Explanation of symbols]
1 Code 2, 12 Container 3, 13 Motor 4, 14 Sealing material 41 Hole 42 Valve 43 Recess 44 Raised part 45 Lip 5 Lid 51 Hole 52 Claw 53 Projection 15 Adhesive 6 Screw 7 Code packing 8 Silicon oil 10 Waterproof motor

Claims (2)

A motor,
A container that has an opening, and stores the motor so that the output shaft of the motor protrudes from the opening;
It is made of an elastic material and has an outer diameter that is almost the same as the inner diameter of the opening, and a hole through which the output shaft passes in a liquid-tight manner and an annular valve having a diameter larger than the inner diameter of the opening are formed on the outer peripheral surface. A seal member applied to the shaft side end surface;
It has a plate shape that can be press-fitted into the opening, has a hole for inserting an output shaft, and includes a lid that can compress the seal member in the thickness direction in cooperation with the output shaft side end surface of the motor at the time of press-fitting ,
The container has an annular groove formed on the inner circumference between the output shaft side end face of the motor and the opening, and has a claw protruding from the outer circumference so that the lid fits into the groove when press-fitted. <br/> A waterproof motor characterized by that. 2. The waterproof motor according to claim 1 , wherein the seal member has an annular recess on a surface thereof, and the lid has an annular protrusion on the back surface that faces the recess and is narrower than the recess and positioned outside the recess. .

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