JP4083472B2 - Screw loosening prevention means, water level detector and drainage pump using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw loosening prevention means for preventing loosening of a nut and a drainage pump for draining condensed water of an air conditioner from an indoor unit to the outside when the nut is fastened and fixed to a screw. The present invention relates to a drainage pump for an air conditioner that employs the screw loosening prevention means in a water level detector that detects the water level.
[0002]
[Prior art]
FIG. 13: is a figure which shows the whole structure of the drainage pump for air conditioners with a water level detector which concerns on a prior art.
The drainage pump 1 with a water level detector is composed of a DC motor unit 3 and a pump unit 2 attached below the DC motor unit 3. A water level detector 7 is connected to a water level detector wire 71, and a water level is connected to the end of the wire 71. A detector connector 72 is provided. The water level detector 7 is attached to the air conditioner drain pump 1 through an engaging portion 74 provided at an end of the water level detector mounting plate 73.
The DC motor unit 3 is formed of, for example, a DC stator coreless brushless motor and a flat motor body 31 that can accommodate the motor. The upper and lower surfaces of the motor body 31 are covered with two thin-plate covers 32 and 33.
[0003]
The bracket 6 is used to suspend the air conditioner drain pump 1 to the top plate of the indoor unit of the air conditioner.
The pump body 21 constituting the pump section 2 is provided with a suction port 22 at the end of the motor body 31 in the protruding direction of the output shaft 34, and the suction port 22 discharges to the side surface closer to the motor body 31. An outlet 23 is provided. An impeller (not shown) is rotatably disposed inside the pump body 21 to constitute the air conditioner drain pump 1.
[0004]
In order to attach the lid member 24 to the pump main body 21, upward engagement claws 25 are arranged on the peripheral wall of the pump main body 21 so as to face each other at intervals of 180 °. On the other hand, the lid member 24 is formed with a lid engaging receptacle that can be clip-engaged with the engaging claw 25, so that the lid member 24 can be selectively fixed to the pump body 21 at different mounting positions. It has become.
On both sides of the lid body 24 on the motor body side, holder fitting portions 241 with respect to the holder 5 to be described later are erected at an interval of 180 °, and each holder fitting portion 241 is thin enough to allow a pair of body engagement claws to be inserted. Grooves are formed. A pair of motor guides 38 is erected on the upper surface of the lid member 24, and the motor part 31 is guided by the guidance of the motor guide 38 when the convex part 39 protruding from the cover 33 is fitted into the motor guide 38. The output shaft 34 of the motor is automatically arranged at the center of the pump unit. The motor guide 38 comes into contact with the convex portion 39 while guiding it, thereby providing a vibration damping effect. A draining plate 35 is attached to the output shaft 34 of the motor.
[0005]
The upper cover 32 is almost entirely covered with a plate-shaped holder portion 51, and a pair of main body engaging claws projecting downward from the left and right side edges of the holder portion 51. Elastic engagement portions are formed at the bottom edge on both the left and right sides of 51.
[0006]
As described above, the motor body 31 is automatically centered on the center of the pump portion 2 by the induction of the motor guide 38, and the pair of body engaging claws of the holder 5 are connected to the pump body. The motor body 31 and the pump body 21 are automatically aligned by being inserted into the holder fitting portion 241 formed in the body 21. By comprising in this way, fixing tools, such as a bolt, become unnecessary in the assembly process of the drain pump for air conditioners, and the assembly process is simplified and reduced in weight.
[0007]
Further, the water level detector 7 is fitted with holders that are erected on both sides of the lid body 24 of the air conditioner drain pump 1 on the motor body side by engaging portions 74 provided at the end of the water level detector mounting plate 73. Engage with the joint portion 271 to be integrated.
[0008]
As shown in the plan view of FIG. 14A, the front view of FIG. 14B, and the side view of FIG. 14C, the engaging portion 74 is provided on the tongue-shaped portion 741 and the tongue-shaped portion 741 on both sides. It consists of a letter-shaped engaging part 742 and a claw part 743 provided on the tip side of the tongue-like part 741, and is connected to the mounting plate 73. The nail | claw part 743 is cut and raised from the tongue-shaped part 741, and protrudes upwards.
[0009]
When the engaging portion 74 on the water level detector 7 side and the holder fitting portion 241 of the lid member 24 of the air conditioner drain pump 1 are integrally formed, the tongue portion 741 of the engaging portion 74 is holder-fitted. When the claw portion 743 is slid along the portion 241 as shown by the arrow in the drawing and the claw portion 743 gets over the upper end portion of the holder fitting portion 241, the claw portion 743 repels and the holder fitting portion 241 is repelled. Is engaged with the holder fitting portion 241.
[0010]
To disengage the engaged water level detector 7 from the air conditioner drain pump 1, the engaging portion 74 is lifted upward to disengage the claw portion 743 from the upper end of the holder fitting portion 241. It can be easily detached by lowering 74 downward.
A water level detector wire 71 extends from the water level detector 7, and a water level detector connector 72 is attached to the end of the water level detector 7. The water level detector 7 is attached to the water level detector mounting plate 73 by sandwiching the water level detector mounting plate 73 therebetween.
[0011]
By the way, in the above description, the case where the water level detector 7 is used in the air conditioner drain pump 1 has been described. However, the water level detector is used in various fields for detecting the water level, and is used. In some cases, when the vibration is large or the ambient temperature range is wide, the screw fixing the water level detector is loosened, and the position of the water level detector deviates from the original operating position.
[0012]
Conventionally, as a method for preventing loosening of the screw, as shown in FIG. 15, after the hexagon nut 76 is screwed into the screw portion 77, a bond is applied between the hexagon nut 76 and the screw portion 77, As shown in FIG. 16, after the hex nut 76 is screwed into the screw portion 77, the hex nut 76 and the screw portion 77 are fixed with a soldering iron to prevent the hex nut 76 from loosening. 17, a method of preventing the hexagon nut 76 from loosening by screwing the hexagon nut 76 into the threaded portion 77 with a spring washer 78 interposed therebetween, as shown in FIG. 17, and two methods as shown in FIG. A method of preventing the hexagon nut 76 from loosening by screwing it into the threaded portion 77 using the hexagon nuts 76, 76, or as shown in FIG. By screwing 9 by interposing the screw portion 77, and a method of preventing loosening of the hex nut 76 is known.
[0013]
[Problems to be solved by the invention]
However, as described above, the conventional screw locking method is a method using a bond (so-called screwing adhesive), heat welding, a spring washer, a double nut, or the like, and this increases the number of parts, members, and devices. Yes, and managing them was difficult.
[0014]
In addition, as described above, there is a method of preventing loosening by sandwiching an O-ring or rubber sheet as described above. However, with this method alone, the O-ring or the like is loosened due to the management of the tightening state or temperature change. When it was sandwiched like a washer under the nut, the O-ring was twisted or cut off due to the tightening torque, and workability was poor.
[0015]
In addition, since the water level detector is required to use a material having good chemical resistance as a use condition, a method such as fixing with a bond cannot be adopted.
[0016]
In view of the above-described conventional problems, the present invention provides a screw loosening prevention means that can prevent loosening by a simple method without adopting a loosening prevention method such as bond lock or thermal welding. An object of the present invention is to provide a drainage pump with a water level detector that employs a locking device for the water level detector.
[0017]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
[0018]
First means, as a screw locking means, and the peripheral wall portion at the time of tightening the nut upper surface against the lower surface of said nut, and said at nut tightening completion is formed to be fitted with the nut detent of the nut, extending from the lower side of the peripheral wall portion in the threaded portion direction, the elastic possess in the direction of screwing, an elastic portion for pressing the upper surface of the polygonal portion formed integrally with the screw portion, downward from the lower portion of the peripheral wall An elastic member that is formed by a polygonal peripheral wall portion that fits into the polygonal portion and is tightened by the nut between the lower surface of the nut and the elastic portion and around the screw portion in the peripheral wall portion It is characterized by arranging.
[0020]
Second means, Oite the first hand stage, characterized in that the peripheral wall portion and the elastic portion is made of resin.
[0021]
The third means is the first means or the second means, wherein the elastic part is formed at a position facing the polygonal part and a peripheral edge of the protruding part, and in a screwing direction. It is characterized by comprising an elastically variable portion.
[0022]
A fourth means is characterized in that, in any one of the first means to the third means, the elastic member is constituted by an O-ring.
[0023]
The fifth means is characterized in that as a water level detector, the screw loosening prevention means described in any one of the first means to the fourth means is used for attaching the water level detector cover.
[0024]
The sixth means comprises a water level detector using the screw loosening prevention means described in any one of the first means to the fourth means as a drainage pump for mounting the water level detector cover. And
[0025]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0026]
FIGS. 1 to 3 are views showing the overall configuration of a drainage pump with a water level detector according to the present embodiment, FIG. 1 is a plan view thereof, FIG. 2 is a front view thereof, and FIG. 3 is a bottom view thereof.
In these drawings, reference numeral 80 denotes a water level detector cover that is screwed to the top of the water level detector 7 and is attached to the water level detector 7, and 81 is integrally provided on the side of the water level detector cover 80. It is an attachment part for attaching 80 to the pump part 2 of the drainage pump 1 for an air conditioner.
Other configurations and operations substantially correspond to the configurations of the same reference numerals shown in FIG.
[0027]
FIG. 4 is an enlarged view showing a part where the water level detector cover 80 is attached to the water level detector 7 in an exploded manner.
As shown in the figure, the water level detector 7 is composed of a hexagonal portion 75 and a screw portion 77 formed integrally with the hexagonal portion 75 at the top thereof. The water level detector cover 80 is formed integrally with the water level detector cover 80 and integrally with the screw portion 77 on the inner surface side of the upper portion of the water level detector cover 80 in addition to the mounting portion 81 described above. A hexagonal peripheral wall portion 82 that fits with the hexagonal portion 75, a ring-shaped protrusion 83 that abuts on the upper surface of the hexagonal portion 75, and a variable portion 84 that has elasticity in the tightening direction of the screw formed on the periphery of the protrusion 83 are formed. Further, on the outer surface side of the upper portion of the water level detector cover 80, a peripheral wall portion 85 that fits into the hexagon nut 76 in a screwed state is formed, and further, around the center portion in the peripheral wall portion 85. Accommodates an elastic member 761 made of an O-ring having elasticity such as rubber.
[0028]
Next, details of the configuration in which the screw loosening prevention means according to the present invention is applied to the attachment of the water level detector cover 80 will be described with reference to FIGS.
5A is a plan view of the water level detector cover 80, FIG. 5B is a cross-sectional front view of the water level detector and the water level detector 7, and FIG. 5C is a view of the water level detector cover 80. It is the figure which expanded and showed the part a to be screwed.
When screwing the water level detector cover 80 to the water level detector 7, first, the water level detector 7 is inserted from the inside of the water level detector cover 80. That is, as shown in FIG. 5 (c), the hexagonal portion 75 configured integrally with the water level detector 7 is inserted until it abuts against the ring-shaped protrusion 83, and the outside of the hexagonal portion 75 is placed inside the hexagonal peripheral wall portion 82. To fit. As a result, the screw portion 77 is prevented from rotating with respect to the water level detector cover 80.
[0029]
A predetermined clearance is provided between the fitted hexagonal portion 75 and the hexagonal circumferential wall portion 82 in order to absorb distortion generated in the hexagonal circumferential wall portion 82 when a hexagon nut 76 described later is tightened. Further, the height of the hexagonal peripheral wall portion 82 has a height that does not rotate when the hexagonal portion 75 is fitted, and the height A of the ring-shaped protrusion 83 is a level difference from the variable portion 84. Of height.
[0030]
Next, the hexagon nut 76 is screwed into the screw portion 77 against the elasticity of the elastic member 761. Here, as shown in the drawing, the height of the peripheral wall portion B is the sum of the appropriate compression dimension of the elastic member 761 to be sandwiched and the height A of the protruding portion 83.
[0031]
Normally, when the water level detector 7 is attached to the water level detector cover 80, an elastic member 761 such as an O-ring that provides a cushioning effect is inserted on the nut side to prevent rattling.
[0032]
Next, a state where the hexagon nut 76 is further screwed in will be described with reference to FIG.
6A, FIG. 6A is a plan view of the water level detector cover 80, FIG. 6B is a cross-sectional front view of the water level detector and the water level detector 7, and FIG. 6C is a water level detector cover. It is the figure which expanded and showed the part b to be screwed.
At this time, as shown in FIG. 6C, even if the hex nut 76 is screwed, it is only deformed by pressing the elastic member 761. Therefore, the six corners of the hexagon nut 76 press the upper part of the peripheral wall part 85 to press down the upper part of the peripheral wall part 85, but the state in which the variable part 84 formed on the periphery of the protrusion 83 is pressed down. It has not reached.
[0033]
Next, a state where the hexagon nut 76 is further screwed in will be described with reference to FIG.
7A, FIG. 7A is a plan view of the water level detector cover 80, FIG. 7B is a sectional front view of the water level detector and the water level detector 7, and FIG. It is the figure which expanded and showed the part c screwed.
At this time, the hexagon nut 76 is screwed in, and as shown in FIG. 7A, the six corners of the hexagon nut 76 press the upper portion of the peripheral wall portion 85, and FIG. As shown in FIG. 4, the hexagon nut 76 presses the elastic member 761 and exhibits a further deformed state. The hexagon nut 76 presses the variable portion 84 formed on the peripheral edge of the projection 83, and the variable portion 84 is It shows a deformed state pushed down.
[0034]
Next, a state where the nut 76 is further screwed in will be described with reference to FIG.
8A, FIG. 8A is a plan view of the water level detector cover 80, FIG. 8B is a sectional front view of the water level detector and the water level detector 7, and FIG. 8C is a view of the water level detector cover. It is the figure which expanded and showed the part d screwed.
At this time, the hexagon nut 76 is screwed in, and as shown in FIG. 8A, the six corners of the hexagon nut are aligned with the six corners of the peripheral wall 85. When this state is reached, as shown in FIG. 8C, the deformation of the variable portion 84 at the periphery of the projection 83 is released upward, so that the upper surface of the peripheral wall 85 is higher than the lower surface of the hexagon nut 76 by a height C. Protruding. Therefore, the outer side of the hexagon nut 76 is fitted into the inner side of the peripheral wall 85, and the hexagon nut 76 is prevented from loosening.
[0035]
In this embodiment, the elastic member 761 having an appropriate compression size of about 1 mm, a threaded portion 77 of M8, and a thread pitch of 1.25 mm (JIS standard) is used. Therefore, when the hexagon nut 76 is tightened, the nut is tightened by about 0.21 mm when the 1/6 circumference nut is turned. When the respective corners of the hexagon nut 76 come into contact with each other in the direction in which the upper surface of the peripheral wall portion 85 is tightened, if the respective corner portions of the hexagon nut 76 tighten the upper surface of the peripheral wall portion 85 to the same arrangement, the threaded portion 77 is maximum. Then, it is pulled out to the nut side by about 0.21 mm and tightened. Accordingly, the ring-shaped protrusion 83 is pushed by the screw 77 and pulled toward the hexagon nut 76. In short, dimension A = 0.21 (in the case of M8 standard screw and hexagon nut) is a condition. Next, when the respective corners of the hexagon nut 76 are arranged in the same manner as the respective corners of the peripheral wall 85, the deformation of the variable portion 84 around the projection 83 is released and the peripheral wall 85 that has been pressed down is released. Is restored. The return amount C at that time is 0.1 to 0.2 mm, and the hexagon nut 76 enters the peripheral wall portion 85 and is in a fitted state.
[0036]
If the depth after entering is an appropriate compression dimension (about 1 mm) of the elastic member 761 made of an O-ring, and A = 0.21 mm, then B = appropriate compression dimension of the elastic member + 0.21 mm = 1.21. .
[0037]
Due to the step C, the hexagon nut 76 must rotate beyond the step C not only in the tightening direction but also in the loosening direction.
[0038]
As described above, according to the embodiment of the present invention, there is no need to lock the nut, and the conventional management of the coating amount, the management of the expiration date of the bond, the management of the tightening torque, and the like become unnecessary, and the number of work steps can be reduced. It becomes possible to plan.
[0039]
FIG. 9 and FIG. 10 are diagrams showing a configuration of the peripheral wall portion 85 having a shape different from the shape of the peripheral wall portion 85 shown in FIG.
The peripheral wall portion 85 shown in FIG. 5A is formed in a hexagonal shape having a shape similar to the hexagonal nut 76, but is not limited to such a shape, and as shown in FIGS. Each corner is left, but even if it is configured to cut out two or three sides out of the six sides, its effectiveness does not change.
[0040]
11 is a view showing a water level detector cover 80 according to the present embodiment, FIG. 11 (a) is a left side view, FIG. 11 (b) is a plan view, FIG. 11 (c) is a front view, and FIG. d) is a bottom view, FIG. 11 (e) is a right side view, and FIG. 11 (f) is a rear view.
As shown in these drawings, an attachment portion 81 provided on the side of the water level detector cover 80 and attached to the pump portion 2 of the air conditioner drain pump engages with the pump portion 2 as shown. Three engaging portions 811 of the attaching portion 81 for the purpose are provided. As a result, the water level detector cover 80 can be firmly attached to the pump unit 2.
[0041]
12A and 12B are views showing a water level detector cover 80 having a shape different from that shown in FIG. 11, FIG. 12A is a plan view, and FIG. 12B is a side view.
As shown in these drawings, a hook portion 812 is provided on the side portion of the water level detector cover 80, here, on the side portion of the attachment portion 81.
Accordingly, in the drainage pump 1 with a water level detector shown in FIG. 2, the water level detector wire 71 is not directly wired to the bracket 6, but the water level detector wire 71 coming out of the water level detector cover 80 is connected to the hook portion 812. After being hooked once, wiring to the bracket 6 is performed. By wiring in this way, water droplets attached to the water level detector electric wire 71 can be guided to the vicinity of the hook portion 812, and water droplets falling on the upper portion of the water level detector cover 80 can be prevented.
[0042]
【The invention's effect】
According to the invention described in claim 1, the screw as a locking means, at the time of tightening the nut upper surface against the lower surface of said nut, and said at nut tightening completion is formed to be fitted with the nut Lock the nut and the peripheral wall portion which extends from the lower side surface of the peripheral wall portion in the threaded portion direction, and the elastic portion of the elastic possess in the direction of screwing, to press the upper surface of the polygonal portion formed integrally with the threaded portion, the peripheral wall portion The nut is formed by a polygonal peripheral wall portion that extends downward from the lower portion of the nut and fits with the polygonal portion , and between the lower surface of the nut and the elastic portion and around the screw portion in the peripheral wall portion. Since the elastic member that is tightened by the screw is arranged, the nut can be prevented from loosening, and the elastic member is sandwiched by the nut, so that rattling after tightening can be prevented. Since there not applied compressive load in assembled state, twisted or broken can be prevented, also it is possible to fix the peripheral wall portion and the elastic portion is integrally formed with the polygonal peripheral wall in a simple manner to the threaded portion It becomes possible.
[0044]
According to the invention described in claim 2 , in the invention described in claim 1 , since the peripheral wall portion and the elastic portion are made of resin, the screw locking means according to the present invention can be realized with a simple configuration. Is possible.
[0045]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the elastic portion includes a protrusion disposed at a position facing the polygonal portion, and a peripheral edge of the protrusion. Since it is formed and formed with a variable portion that is elastically variable in the screwing direction, it is possible to simply configure the protrusion and variable portion that perform the main functions as the screw loosening prevention means of the present invention as the elastic portion. Become.
[0046]
According to the invention of claim 4 , in the invention of any one of claims 1 to 3 , the elastic member is configured by an O-ring, so that the elastic member can be easily formed by a simple member. Can be realized.
[0047]
According to the fifth aspect of the present invention, since the screw loosening prevention means according to any one of the first to fourth aspects is used for mounting the water level detector cover, the water level detector cover is loosened. Can be reliably prevented.
[0048]
According to the invention described in claim 6 , as the drainage pump, the water level detector using the screw locking means according to any one of claims 1 to 4 for mounting the water level detector cover. Since the water level detector cover can be reliably prevented from being loosened, the function as a water level detector in the drainage pump can be sufficiently achieved.
[Brief description of the drawings]
FIG. 1 is a plan view showing the overall configuration of a drainage pump with a water level detector according to the present invention.
FIG. 2 is a front view showing an overall configuration of a drainage pump with a water level detector according to the present invention.
FIG. 3 is a bottom view showing an overall configuration of a drainage pump with a water level detector according to the present invention.
4 is an enlarged view showing an exploded view of a portion where the water level detector cover 80 shown in FIG. 2 is attached to the water level detector 7. FIG.
5 is a plan view of the water level detector cover 80 shown in FIG. 2, a cross-sectional front view of the water level detector and the water level detector 7, and an enlarged portion a where the water level detector cover 80 is screwed. FIG.
6 is a plan view of the water level detector cover 80 shown in FIG. 2, a cross-sectional front view of the water level detector and the water level detector 7, and an enlarged portion b where the water level detector cover 80 is screwed. FIG.
7 is an enlarged plan view of the water level detector cover 80 shown in FIG. 2, a cross-sectional front view of the water level detector and the water level detector 7, and an enlarged portion c to which the water level detector cover 80 is screwed. FIG.
8 is a plan view of the water level detector cover 80 shown in FIG. 2, a cross-sectional front view of the water level detector and the water level detector 7, and an enlarged portion d to which the water level detector cover 80 is screwed. FIG.
9 is a diagram showing a configuration of a peripheral wall portion 85 having a shape different from the shape of the peripheral wall portion 85 shown in FIG.
10 is a diagram showing a configuration of a peripheral wall portion 85 having a shape different from the shape of the peripheral wall portion 85 shown in FIG.
FIG. 11 is a left side view, a plan view, a front view, a bottom view, a right side view, and a rear view of a water level detector cover 80 according to the present embodiment.
12 is a plan view and a side view of a water level detector cover 80 having a shape different from that shown in FIG.
FIG. 13 is a diagram illustrating an overall configuration of a drain pump for an air conditioner with a water level detector according to a conventional technique.
14 is an enlarged plan view, a front view, and a side view showing configurations of the mounting plate 73 and the engaging portion 74 shown in FIG.
FIG. 15 is a diagram showing a screw loosening prevention method according to the prior art.
FIG. 16 is a diagram illustrating a screw loosening prevention method according to the prior art.
FIG. 17 is a diagram showing a screw loosening prevention method according to the prior art.
FIG. 18 is a diagram showing a screw loosening prevention method according to the prior art.
FIG. 19 is a diagram showing a screw loosening prevention method according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drain pump with a water level detector 2 Pump part 21 Pump main body 22 Suction port 23 Discharge port 25 Engagement claw 3 DC motor part 31 Motor main body 32, 33 Thin plate cover 6 Bracket 7 Water level detector 7
71 Water level detector wire 72 Water level detector connector 75 Hexagonal portion 76 Hexagon nut 761 Elastic member 77 Screw 80 Water level detector cover 81 Mounting portion 811 Hook portion 82 Hexagonal peripheral wall portion 83 Projection portion 84 Variable portion 85 Perimeter wall portion

Claims (6)

And the peripheral wall portion upper face at the time of tightening nut against the lower surface of said nut, and said at nut tightening completion is formed to be fitted with the nut detent of the nut,
Extending from the lower side of the peripheral wall portion in the threaded portion direction, and the elastic portion of the elastic possess in the direction of screwing, to press the upper surface of the polygonal portion formed integrally with the screw portion,
While extending downward from the lower portion of the peripheral wall portion , and configured with a polygonal peripheral wall portion that fits with the polygonal portion ,
A screw loosening prevention means, characterized in that an elastic member tightened by the nut is disposed between the lower surface of the nut and the elastic portion and around the screw portion in the peripheral wall portion. The screw loosening prevention means according to claim 1, wherein the peripheral wall portion and the elastic portion are made of resin . The elastic part is composed of a projecting part disposed at a position facing the polygonal part, and a variable part formed on the periphery of the projecting part and elastically variable in a screwing direction. The screw locking means according to claim 1 or 2. The screw loosening prevention means according to any one of claims 1 to 3, wherein the elastic member comprises an O-ring . A water level detector, wherein the screw locking means according to any one of claims 1 to 4 is used to attach a water level detector cover . A drainage pump comprising a water level detector using the screw loosening prevention means according to any one of claims 1 to 4 for mounting a water level detector cover.

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