JP2004079622A - Seal structure of lead wire lead-out part and method of sealing lead wire lead-out part - Google Patents

Abstract

A lead wire lead-out part which does not cause electrical continuity failure in a lead wire lead-out part and which does not generate a respiratory action even if a pressure difference between inside and outside occurs due to a temperature change and has excellent sealing properties. And a method of sealing a lead wire lead-out part. An intermediate core exposed part in which a core is exposed by cutting off insulating coating parts 15b and 15c at an intermediate part of a lead wire 15, and both sides of the core exposed part. And the insulating coating portion were integrally sealed with the sealing resin C together with the lead wire lead-out portion 17.
[Selection diagram] Fig. 4

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to, for example, a seal structure of a lead wire lead portion of a motor such as a pump and a method of sealing a lead wire lead portion.
[0002]
[Prior art]
Conventionally, for example, in a refrigerating cycle, separately from a refrigerant circulating in the refrigerating cycle, by circulating a blind liquid, which is an antifreeze liquid, from the outside of the evaporator to the evaporator, the evaporator is used as a heat exchanger, A chiller system has been used in which the blind liquid is cooled or heated in a specific manner, and the blind liquid is circulated in a room or the like to cool or heat the room or the like.
[0003]
[Problems to be solved by the invention]
By the way, such a blind liquid may become old as it is used, or may be deteriorated due to mixing of particles or the like. The work of extracting from the liquid tank is being performed.
[0004]
For this reason, conventionally, a pump for maintenance of the blind liquid is attached to the blind liquid tank in advance, or is attached at the time of maintenance.
By the way, in such a pump for maintenance of blind liquid, a motor 104 is fixed in a motor case 102 of the pump 100 as shown in FIG. From the upper end of the motor 104, a lead wire 106 is connected to another lead wire 110 and core wires 112 and 114 by a lead wire lead-out portion 108 provided on the side of the motor case 102. , Welding, welding, caulking or the like.
[0005]
Then, the lead wire lead-out portion 108 is sealed with a sealing resin 116 such as an adhesive or a filler, which is excellent in adhesiveness and shear force performance to the core wire. Accordingly, a change in temperature and a change in pressure inside and outside the motor case 102 causes moisture such as moisture to enter the pump 100 by a respiratory action via the core wire portions 112 and 114 and affect the motor 104 and the like. Is to be prevented.
[0006]
As described above, when the core portion 112 of the lead wire 106 and the core portion of the lead wire 110 are connected to each other by the connection portion 118 such as solder, an electrical conduction failure occurs unless the connection reliability is high. Will do.
Note that such a problem occurs not only in the connection portion between the lead wires as described above, but also in the resin sealing portion between the lead wire and the terminal.
[0007]
In view of the above situation, the present invention does not cause electrical continuity failure in the lead wire lead-out portion, and furthermore, even if a pressure difference between the inside and outside occurs due to a temperature change, no respiratory action occurs, and the seal It is an object of the present invention to provide a lead wire lead-out portion sealing structure and a lead wire lead-out portion sealing method having excellent characteristics.
[0008]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made in order to achieve the problems and objects in the prior art as described above, and the seal structure of the lead wire lead-out part of the present invention cuts off the insulating coating part in the middle part of the lead wire. And an intermediate core exposed part where the core is exposed,
And insulating coating portions on both sides of the core exposed portion,
It is characterized by being integrally sealed with a sealing resin together with the lead wire lead-out portion.
[0009]
Further, the method of sealing the lead wire lead-out portion of the present invention, an intermediate core exposed portion in which the core is exposed by cutting off the insulating coating portion of the intermediate portion of the lead wire,
And insulating coating portions on both sides of the core exposed portion,
It is characterized by being integrally sealed with a sealing resin together with the lead wire lead-out portion.
[0010]
With this configuration, the sealing resin enters the exposed portion of the intermediate core wire where the core wire is exposed, and the sealing is performed. Therefore, the sealing property is significantly improved.
Therefore, since the core portions of the two lead wires are not connected by solder or the like as in the related art, they are one lead wire, so that electrical conduction failure may occur in the lead wire lead-out portion. In addition, even if there is a pressure difference between the inside and outside due to a temperature change, no respiratory action occurs and the sealing property is excellent.
[0011]
Also, in the present invention, the lead wire lead-out portion has a tapered portion formed at an inner peripheral portion of an insertion hole for drawing out the lead wire to the outside, and the lead wire is connected to the outside through the tapered portion of the insertion hole. It is characterized by being drawn out.
With this configuration, the operation of pulling out the lead wire from the insertion hole to the outside becomes easy, and the lead wire lead-out portion can be reliably formed.
[0012]
Further, in the present invention, in order to prevent the lead wire from dropping out of the insertion hole for drawing out the lead wire formed in the lead wire drawing portion to the outside, the core wire exposed portion is inserted through the insulating coating portion on the insertion hole side. A retaining ring member having a diameter larger than the diameter of the hole is fixed.
With such a configuration, the lead wire is not dropped off by the retaining ring member, the tensile strength can be kept constant, and the quality is improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings. FIG. 1 is an overall schematic cross-sectional view of a fixing structure of a pump showing an example in which a seal structure of a lead wire lead-out portion of the present invention is applied to a pump for blind liquid maintenance. FIG. 2 is a vertical cross-sectional view of FIG. 3 is a longitudinal sectional view of the pump of FIG. 1, and FIG. 4 is a partially enlarged sectional view of a lead wire lead-out portion of the pump of FIG.
[0014]
In FIG. 1, reference numeral 10 denotes a pump fixing structure as a whole. The pump fixing structure 10 is provided in, for example, a tank 14 that stores the blind liquid B of a chiller type refrigeration cycle.
That is, the tank 14 includes the top plate 16 and the bottom plate 18, and the top plate 16 has the pump opening 20 formed therein. As shown in FIG. 3, a tank-side mounting joint 22 for fixing the pump body is fixed to the pump opening 20. The tank-side mounting joint 22 has a pump-side fixing tank-side flange 24 protruding from the outer peripheral side at an upper end thereof.
[0015]
On the other hand, a pumping pipe 30 is provided below the pump body 28 of the pump 26, and the pumping pipe 30 of the pump body 28 is inserted into the tank 14 from the pump opening 20.
Further, a pump chamber 32 is defined in the pump main body 28 as shown in FIG.
[0016]
Further, a downward extension 34 extends downward from the pump chamber 32. A seal groove 36 is formed in an outer peripheral portion of the downwardly extending portion 34, and a seal member 38 such as an O-ring is mounted in the seal groove 36. Further, a pump-side flange 40 for fixing the pump body protrudes from a base end above the lower extension 34.
[0017]
Further, a discharge port 12 that opens to the side of the tank-side fitting 22 is formed, and as shown in FIG. 3, a lower extension portion 34 that extends below the pump main body 28 forms the discharge port. It extends below 12. A seal groove 36 is also formed at the lower end of the downwardly extending portion 34, and a seal member 38 such as an O-ring is mounted.
[0018]
The lower extension 34 is provided with a discharge opening 41 for discharging the blind liquid B in the tank 14 that has risen up the pumping pipe 30 to the discharge port 12.
In a state where the pump side flange 40 and the tank side flange 24 abut against each other, as shown in FIG. 3, the pump side flange 40 and the tank side flange 24 are engaged with the engagement slit 44 of the quick fastener 42. The quick fasteners 42 are elastically attached to both flanges from the outer peripheral side.
[0019]
Thereby, the pump main body 28 is configured to be rotatable and detachably attached to the tank 14.
Therefore, the motor case 54 is detachably mounted above the pump body 28 via the retaining ring member 50.
On the other hand, as shown in FIG. 3, a partition 62 is mounted on the motor case 54, and a seal member 64 such as an O-ring is interposed between the partition 62 and the pump body 28. A seal member 66 such as an O-ring is interposed between the partition wall 62 and the motor case 54.
[0020]
A substantially cup-shaped motor fixing member 70 is fixed in an opening 61 of the partition wall 62. A motor 68 is fitted in a concave portion 72 of the motor fixing member 70, and an upper inner wall of a motor case 54. The motor 68 is fixed between the fixing projection 63 and the fixing projection 63. An elastic member 13 such as an O-ring is interposed between the upper end of the motor 68 and the fixing projecting portion 63 of the motor case 54, as shown in FIG. Functions are provided.
[0021]
As shown in FIGS. 3 and 4, one lead lead 15 of each pole is connected from the upper end of the motor 68, and a lead lead portion (resin sealing portion) 17 of the lead wire 15 is connected. In the intermediate portion 15a, the insulating coating is cut off and the core wire 11 is exposed. Then, the core wire 11 and the insulating coating portions 15b and 15c at both ends of the core wire 11 of the lead wire 15 are sealed with the sealing resin C.
[0022]
As a result, no electrical conduction failure occurs in the lead wire lead portion, and even if a pressure difference between the inside and outside occurs due to a temperature change, no respiratory action occurs and the lead wire lead portion has excellent sealing properties. Seal structure. That is, through the core wire 11, moisture such as moisture is prevented from entering the pump 26 by the respiratory action and affecting the motor 68 and the like.
[0023]
As such a sealing resin C, it is preferable to use a resin, such as an adhesive or a filler, which is excellent in adhesiveness to the core wire 11, shear force performance, and the like. As such a sealing resin C, for example, epoxy, urethane, silicone or the like can be used.
The length L of the exposed portion of the core wire 11 is not particularly limited, but is preferably 5 to 7 mm in consideration of the above-described sealing performance and the like.
[0024]
Further, as shown in FIGS. 3 and 4, in order to facilitate the drawing, the inner periphery of the insertion hole 17 a of the lead wire drawing portion 17 is provided for facilitating the insertion and drawing of the drawing lead wire 15. A tapered portion 21 is formed. The lead wire 15 is drawn out through the tapered portion 21 of the insertion hole 17a. As shown in FIGS. 3 and 4, a retaining ring member 23 having a diameter larger than the diameter of the insertion hole 17 a is caulked to the insulating coating portion 15 b on the insertion hole 17 a side of the exposed core wire of the lead wire 15. Has been fixed by. This makes it possible to prevent or prevent the lead wire 15 from dropping out of the insertion hole 17a, and to perform positioning during assembly. Therefore, with such a configuration, the retaining ring member 23 does not cause the lead wire to fall off, the tensile strength can be kept constant, and the quality is improved.
[0025]
In this case, as a method of configuring such a lead wire lead-out structure, a motor 68, a motor fixing member 70, a magnet fixing plate 76, and a magnet 78 are integrally formed, and these are mounted on the motor case 54 and pulled out. The lead 15 is connected to the terminal at the upper end of the motor 68. Then, the lead wire 15 is inserted through the insertion hole 17a of the lead wire lead-out portion 17 and pulled out, so that the retaining ring member 23 is positioned in the insertion hole 17a. The intermediate portion 15a is positioned so as to be located at the lead wire lead-out portion 17, and is sealed with the sealing resin C.
[0026]
A magnet 78 is fixed to a drive shaft 74 of the motor 68 via a magnet fixing plate 76, and the end of the drive shaft 74 can rotate in a bearing hole 80 formed in the upper center of the partition wall 62. It is attached to.
Further, a second shaft 86 fixed to a rotor 84 made of a magnet is rotatably mounted in a bearing hole 82 formed in the lower center of the partition 62.
[0027]
At the lower end of the rotor 84, a first shaft 88 is connected to a second shaft 86. As shown in FIG. 1, the first shaft 88 extends downward inside the pumping pipe 30. As a result, it reaches the rotating blade portion 90 which is installed while sitting on the bottom plate 18 of the tank 14.
As shown in FIG. 2, the rotating blade 90 includes a lower case 92 and an upper case 94. The lower end of the water pump 30 is fixed to the opening 98 of the upper case 94.
[0028]
Further, as shown in FIG. 2, the first shaft 88 penetrates the shaft hole 25 formed in the center of the upper case 94, and is fixed to the swirl pump blade 27 that generates a swirl by press-fitting.
In FIG. 2, reference numeral 37 indicated by a dotted line is a rising hole formed in the upper case 94 for the blind liquid B to rise through the water pump 30. Further, an opening 39 for inflow of the blind liquid B is formed at the lower end of the lower case 92 of the rotary blade 90.
[0029]
The pump 26 thus configured operates as follows.
That is, when the motor 68 is energized via the lead wire 15, the drive shaft 74 rotates and the magnet 78 rotates. By the rotation of the magnet 78, the rotor 84 made of the magnet is rotated by the magnetic coupling effect.
[0030]
Accordingly, the second shaft 86 fixed to the rotor 84 rotates, and accordingly, the first shaft 88 connected to the second shaft 86 rotates.
When the first shaft 88 rotates, the vortex pump blade 27 fixed to the first shaft 88 rotates.
The rotation of the vortex pump blade 27 generates a vortex, and the blind liquid B in the tank 14 flows into the lower case 92 of the rotary blade 90 through the opening 39. Then, the blind liquid B rises through the pumping pipe 30 through the raising hole 37 formed in the upper case 94 and is discharged from the pump chamber 32 of the pump body 28 through the discharge port 12 opened to the side. It is supposed to be.
[0031]
Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. In the above embodiment, the pump provided in the tank 14 for storing the blind liquid B of the chiller type refrigeration cycle and the like is described. However, for example, in the lead wire lead-out part of other equipment, it is also applicable to a part for preventing intrusion of water from the outside and a part for preventing a sealed gas inside from leaking to the outside. Various changes can be made without departing from the purpose of the present invention, such as the following.
[0032]
【The invention's effect】
According to the present invention, since the sealing resin enters the exposed portion of the intermediate core wire where the core wire is exposed and is sealed, the sealing property is significantly improved.
Therefore, since the core portions of the two lead wires are not connected by solder or the like as in the related art, they are one lead wire, so that electrical conduction failure may occur in the lead wire lead-out portion. In addition, even if there is a pressure difference between the inside and outside due to a temperature change, no respiratory action occurs and the sealing property is excellent.
[0033]
Further, in the present invention, the lead wire draw-out portion has a tapered portion formed at an inner peripheral portion of an insertion hole for drawing out the lead wire to the outside, and the lead wire is externally connected through the tapered portion of the insertion hole. Since the lead wire is drawn out, the operation of pulling out the lead wire from the insertion hole to the outside becomes easy, and the lead wire draw-out portion can be reliably formed. Further, in the present invention, in order to prevent the lead wire from dropping out of the insertion hole for drawing out the lead wire formed in the lead wire draw-out portion to the outside, the insulating coating portion on the insertion hole side of the core exposed portion is provided with the insertion hole. Since a retaining ring member having a diameter larger than the diameter is fixed, the retaining ring member does not allow the lead wire to fall off, it is possible to maintain a constant tensile strength, and the quality is improved. This is an extremely excellent invention which has a remarkable and unique effect.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an entire pump fixing structure showing an example in which a lead wire lead-out portion sealing structure of the present invention is applied to a pump for maintenance of blind liquid.
FIG. 2 is a longitudinal sectional view of FIG.
FIG. 3 is a longitudinal sectional view of the pump of FIG. 1;
FIG. 4 is a partially enlarged sectional view of a lead wire lead-out portion of the pump of FIG. 1;
FIG. 5 is a partially enlarged cross-sectional view of a conventional lead wire lead-out portion for blind liquid maintenance.
[Explanation of symbols]
Reference Signs List 10 pump fixing structure 11 core wire 12 discharge port 13 elastic member 14 tank 15 lead wire 15a intermediate portions 15b, 15c insulating coating portion 16 top plate 17a insertion hole 17 lead wire lead-out portion (resin sealing portion)
18 Bottom plate 20 Pump opening 21 Taper portion 22 Tank side mounting joint 23 Retaining ring member 24 Tank side flange 25 Shaft hole 26 Pump 27 Eddy current pump blade 28 Pump body 30 Pumping pipe 32 Pump chamber 34 Lower extension 36 Seal groove 37 Ascending hole 38 Sealing member 39 Opening 40 Pump side flange 41 Discharge opening 42 Quick fastener 44 Engagement slit 50 Retaining ring member 54 Motor case 61 Opening 62 Partition wall 63 Fixing projection 64 Sealing member 66 Sealing member 68 Motor 70 Motor fixing member 72 Recess 74 Drive shaft 76 Magnet fixing plate 78 Magnet 80 Bearing hole 82 Bearing hole 84 Rotor 86 Second shaft 88 First shaft 90 Rotating blade 92 Lower case 94 Upper case 98 Opening 100 Pump 102 Motor case 104 Motor 106 Lead wire 108 Lead wire lead 110 Lead wire 112, 114 Core wire portion 116 Sealing resin 118 Connection portion B Blind liquid C Sealing resin

Claims (6)

An intermediate core exposed portion in which the core is exposed by cutting off the insulating coating portion in the middle of the lead wire,
And insulating coating portions on both sides of the core exposed portion,
A sealing structure for a lead wire lead portion, wherein the lead wire lead portion is integrally sealed with a sealing resin. In the lead wire lead-out portion, a tapered portion is formed in an inner peripheral portion of an insertion hole for drawing out the lead wire to the outside, and the lead wire is drawn out through the tapered portion of the insertion hole. The seal structure of a lead wire lead-out part according to claim 1, characterized in that: In order to prevent the lead wire from dropping out of the insertion hole for pulling out the lead wire formed in the lead wire lead-out portion to the outside, the insulating coating portion on the insertion hole side of the core wire exposed portion is larger than the diameter of the insertion hole. The sealing structure for a lead wire lead-out portion according to claim 1, wherein a retaining ring member having a diameter is fixed. An intermediate core exposed portion in which the core is exposed by cutting off the insulating coating portion in the middle of the lead wire,
And insulating coating portions on both sides of the core exposed portion,
A method for sealing a lead wire lead-out portion, wherein the sealing is performed integrally with a sealing resin together with the lead wire lead-out portion. The lead wire lead-out portion has a tapered portion formed at an inner peripheral portion of an insertion hole for drawing out the lead wire to the outside, and the lead wire is drawn out through the tapered portion of the insertion hole. The method for sealing a lead wire lead-out portion according to claim 4. In order to prevent the lead wire from dropping out of the insertion hole for pulling out the lead wire formed in the lead wire lead-out portion to the outside, the insulating coating portion on the insertion hole side of the core wire exposed portion is larger than the diameter of the insertion hole. 6. The method according to claim 4, wherein a retaining ring member having a diameter is fixed.

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