Sealed terminals

Abstract

To provide a sealed terminal capable of preventing a short circuit between connection terminals through moisture due to condensation even when the surface of the sealed terminal is condensed.SOLUTION: A sealed terminal includes a first member 8 and a second member 9 made of an insulator connected to each other, a main body 6 having a plurality of through holes 11 penetrating through the first member 8 and the second member 9, and a connection terminal 7 provided in the through hole 11 and connecting the ends of the two lead wires 17 and 18, and the connection terminal 7 has a connection terminal body portion 19 provided so as to engage with the through hole 11 in the center line direction, and the boundary portion between the first member 8 and the second member 9 and the outer peripheral surface of the connection terminal body portion 19 form a first seal member incorporating space 22, and a first seal member 23 is incorporated into the first seal member incorporating space 22, such that a gap between the first member 8 and the second member 9 is sealed for the through hole 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sealed terminal that is attached to an opening of a sealed container and electrically connects a lead wire inside the sealed container to a lead wire outside the sealed container. [Background technology]

[0002] Conventionally, when supplying power or transmitting electrical signals to an electrical device (e.g., a motor pump) inside a sealed container from outside the container, a sealed terminal is used to connect a lead wire inside the sealed container to a lead wire outside the sealed container.

[0003] This type of sealed terminal is composed of a metal body, a number of through holes provided in the body, and connection terminals provided to pass through each of the number of through holes. It is known that each connection terminal is bonded to the body using molten insulating glass (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 10-196573 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the sealed terminal disclosed in Patent Document 1, the three connection terminals (lead terminal pins 20) and the three through holes (holes 24) through which the three connection terminals are inserted are separated from each other. Therefore, a short circuit does not usually occur between the connection terminals.

[0006] However, depending on the type of electrical equipment installed in the sealed container and the manner in which it is used, a temperature difference may occur between the inside and outside of the sealed container, and condensation may form on the surface of the sealed terminal attached to the opening of the sealed container. If condensation forms on the surface of the sealed terminal, there is a risk of a short circuit occurring between the connection terminals.

[0007] The present invention has been devised in view of the above problems, and has an object to provide a sealed terminal that can prevent short circuits from occurring between each connection terminal even if condensation occurs on the surface. [Means for solving the problem]

[0008] A sealed terminal according to a first aspect of the present invention includes a first member and a second member made of an insulator connected to each other, a body having a plurality of through holes penetrating the first member and the second member, and a connection terminal provided in each of the plurality of through holes for connecting ends of two lead wires. The through hole has a large diameter portion and a general portion formed on both sides of the large diameter portion and having an inner diameter smaller than that of the large diameter portion. The connection terminal has a connection terminal main body provided to engage with a step generated between the large diameter portion and the general portion of the through hole in the center line direction of the through hole. A first seal member fitting space is formed by a boundary portion between the first member and the second member and an outer circumferential surface of the connection terminal main body. By fitting a first seal member into the first seal member fitting space, a gap between the first member and the second member is sealed against the through hole.

[0009] With a sealed terminal having such a configuration, even if condensation occurs on the surface of the sealed terminal, it is possible to prevent short circuits from occurring between the connection terminals.

[0010] A sealed terminal according to a second aspect of the present invention is the sealed terminal according to the first aspect, wherein the main body further includes a third member made of an insulator connected to the second member. The through hole penetrates the first member, the second member, and the third member. A second seal member fitting space is formed by a boundary portion between the second member and the third member and an outer peripheral surface of the lead wire. By fitting the second seal member into the second seal member fitting space, a gap between the second member and the third member is sealed against the through hole.

[0011] A sealed terminal according to a third aspect of the present invention is the sealed terminal according to the second aspect, wherein the first member, the second member and the third member are fastened to one another by a screw.

[0012] A sealed container according to a fourth aspect of the present invention is a sealed container comprising the sealed terminal according to the second or third aspect, a container body having a cylindrical opening to which the sealed terminal is attached and a male thread formed around the periphery, and a connection ring having a female thread portion screwed to the male thread portion formed around the opening and an inward flange portion abutting an end face of the opening. A flange portion extending radially outward is formed on the outer circumferential surface of the body. A different diameter portion having a smaller diameter on the container body side is formed inside the opening. The body is fitted at its tip side from the flange portion to the rear side of the different diameter portion of the opening, and the container body side of the flange portion is engaged with the different diameter portion. A third seal member fitting space is formed by the surface of the flange portion opposite to the container body, the inner surface of the opening, and the inward flange portion. By fitting a third seal member into the third seal member fitting space, the inside of the container body is sealed from the outside of the container body. Effect of the Invention

[0013] According to the present invention, it is possible to provide a sealed terminal capable of preventing short circuits from occurring between connection terminals even if condensation occurs on the surface of the sealed terminal. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a cross-sectional view of a sealed terminal according to the embodiment. [Diagram 2] FIG. 2 is an exploded cross-sectional view of the sealed terminal according to the embodiment. [Diagram 3] FIG. 11 is a cross-sectional view of a sealed terminal according to another embodiment. [Figure 4] 2 is a view taken along the arrow A in FIG. 1, showing only the main body. [Diagram 5] 4 is a cross-sectional view showing a state in which the sealed terminal according to the embodiment is attached to a sealed container. FIG. [Figure 6] FIG. 2 is an exploded cross-sectional view of a sealed terminal and a sealed container according to the embodiment. [Figure 7] FIG. 11 is a cross-sectional view of a sealed terminal according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a sealed terminal according to an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, a sealed terminal 1 according to an embodiment of the present invention electrically connects an electric device 3 sealed in a sealed container 2 to a power source 4 installed outside the sealed container 2. The sealed terminal 1 includes a main body 6, a connection terminal 7, and the like.

[0016] 1 and 2, the main body 6 has a first member 8, a second member 9, and a third member 24 made of insulators connected to one another. The main body 6 also has a plurality of through holes 11 penetrating the first member 8, the second member 9, and the third member 24. The main body 6 is formed by connecting the first member 8, the second member 9, and the third member 24, each of which has a cylindrical shape and the same diameter, in the direction of the center line of the cylinder. The main body 6 also has a flange portion 37 formed on the outer circumferential surface thereof, which extends radially outward.

[0017] Each of the multiple through holes 11 has a large diameter portion 13 and general portions 14 formed on both sides of the large diameter portion 13 and having an inner diameter smaller than that of the large diameter portion 13. A boundary portion between the first member 8 and the second member 9, where the first member 8 and the second member 9 face each other, is defined as a first connecting portion 12. The first connecting portion 12 connects the end faces of the cylindrical first member 8 and second member 9 facing each other.

[0018] 1, the large diameter portion 13 is formed in both the first member 8 and the second member 9 across a first connecting portion 12 that is a connecting portion between the first member 8 and the second member 9. On both sides of the large diameter portion 13, general portions 14 having an inner diameter smaller than that of the large diameter portion 13 are formed. Note that the large diameter portion 13 may be formed only in the second member 9, as shown in FIG.

[0019] Additionally, the edge formed at the intersection of the first connecting portion 12 and the large diameter portion 13 of the second member 9 is chamfered to form a first inclined surface 10.

[0020] The connection terminals 7 are provided in each of the multiple through holes 11, and electrically connect ends of two lead wires, a first lead wire 17 and a second lead wire 18, to each other. The connection terminals 7 are made of a conductive metal, and one is provided in each of the multiple through holes 11. The first lead wire 17 connects the electrical device 3 in the sealed container 2 to the connection terminal 7. The second lead wire 18 connects the connection terminal 7 to the power source 4.

[0021] The power source 4 is a three-phase AC power source. Therefore, there are three first lead wires 17 and three second lead wires 18, and three connection terminals 7 and through holes 11. As shown in Fig. 4, when viewed from the center line direction of the cylindrical body 6, three through holes 11 are formed at equal intervals on the same circumference.

[0022] The connection terminal 7 is formed by a connection terminal body 19 and a lead wire connection portion 21. The outer diameter of the connection terminal body 19 is smaller than the outer diameter of the large diameter portion 13 and is larger than the inner diameter of the general portion 14. The connection terminal body 19 is cylindrical and is fitted into the large diameter portion 13.

[0023] The lead wire connection portion 21 is substantially cylindrical, has an outer diameter smaller than the inner diameter of the through hole 11, and is formed on both end surfaces of the cylinder in the connection terminal body 19. The lead wire connection portions 21 formed on both end surfaces of the connection terminal body 19 are connected to the first lead wire 17 and the second lead wire 18, respectively. The first lead wire 17 and the second lead wire 18 are inserted one by one into the lead wire connection portions 21 formed on each end surface of the connection terminal body 19. The first lead wire 17 and the second lead wire 18 are connected to each other by crimping the lead wire connection portions 21 from the outside with crimping pliers or the like.

[0024] The connection terminal body 19 is provided so as to engage with a step occurring between the large diameter portion 13 and the general portion 14 of the through hole 11 in the center line direction of the through hole 11. In this embodiment, the connection terminal 7 is fixed in the large diameter portion 13 in the center line direction of the through hole 11.

[0025] The first seal member fitting space 22 is a space in which the first seal member 23 is fitted. The first seal member fitting space 22 is formed by the boundary portion between the first member 8 and the second member 9 and the outer circumferential surface of the connection terminal main body 19. In this embodiment, the boundary portion (first coupling portion 12) is the portion between the end face of the second member 9 and the first inclined surface 10.

[0026] The gap between the first member 8 and the second member 9 is sealed against the through hole 11 by fitting a first seal member 23 in the first seal member fitting space 22. The first seal member 23 may be, for example, an O-ring.

[0027] The shape and position of the first seal member-inserting space 22 are not limited to those described above. The shape of the first seal member-inserting space 22 may be a square in cross section or the like. The position of the first seal member-inserting space 22 may straddle the first connecting portion 12.

[0028] The material of the first seal member 23 is, for example, fluororubber. The material of the connection terminal 7 is, for example, stainless steel. The first lead wire 17 and the second lead wire 18 have a coating formed of a fluorine-based insulating material on the surface. The first seal member 23, the connection terminal 7, the first lead wire 17, and the second lead wire 18 are all made of materials with excellent heat resistance.

[0029] Furthermore, in this embodiment, an O-ring is used as the first sealing member 23 for the sealed terminal 1. Therefore, when the temperature inside the sealed container 2 becomes high or low, even if distortion occurs in the main body 6 made of an insulator such as resin and the connecting terminal 7 made of metal due to the difference in the linear expansion coefficient between the main body 6 and the connecting terminal 7, the seal is maintained by the elastic deformation of the first sealing member 23.

[0030] The main body 6 further includes a third member 24 made of an insulator connected to the second member 9. Each of the multiple through holes 11 penetrates the first member 8, the second member 9, and the third member 24.

[0031] The second member 9 has a small diameter portion 31 in the through hole 11 at the end portion connected to the third member 24. The small diameter portion 31 has an inner diameter smaller than the inner diameter of the general portion 14 and larger than the outer diameter of the second lead wire 18. Furthermore, the through hole 11 in the third member 24 is formed only by the small diameter portion 31.

[0032] Additionally, an edge formed at the intersection between the second connecting portion 29 of the second member 9 and the small diameter portion 31 is chamfered to form a second inclined surface .

[0033] The second seal member fitting space 32 is a space in which the second seal member 27 is fitted. The second seal member fitting space 32 is formed by a boundary portion between the second member 9 and the third member 24 and the outer circumferential surface of the second lead wire 18. In this embodiment, the boundary portion (second connecting portion 29) is a portion between one surface of the third member 24 and the second inclined surface 28.

[0034] The gap between the second member 9 and the third member 24 is sealed against the through hole 11 by fitting a second seal member 27 in a second seal member fitting space 32 .

[0035] The shape and position of the second seal member fitting space 32 are not limited to those described above. The shape of the second seal member fitting space 32 may be a square in cross section, etc. The position of the second seal member fitting space 32 may straddle the second connecting portion 29.

[0036] According to the sealed terminal 1 of this embodiment, the gap between the first member 8 and the second member 9 and the through hole 11 are sealed by the first sealing member 23, so that even if condensation occurs on the outer surface of the main body 6 or in the gap between the first member 8 and the second member 9, the condensation can be prevented from passing through the gap between the first member 8 and the second member 9 and contacting the connection terminal 7.

[0037] Moreover, according to the sealed terminal 1 of this embodiment, the gap between the second member 9 and the third member 24 and the small diameter portion 31 are sealed by the second seal member 27. Furthermore, the gap between the second member 9 and the second lead wire 18 is sealed. Therefore, even if condensation occurs on the outer surface of the main body 6, the condensation can be prevented from passing through the gap between the second member 9 and the third member 24 and the small diameter portion 31 and coming into contact with the connection terminal 7.

[0038] The first member 8, the second member 9, and the third member 24 are connected to each other using a screw 33. The main body 6 formed by the first member 8, the second member 9, and the third member 24 has three screw holes 34 formed at equal intervals on the same circumference as seen from the center line direction of the cylindrical main body 6. The screw holes 34 penetrate the third member 24 and the second member 9, and are also provided in the first member 8 from the second connecting portion 29 to more than half the length in the center line direction of the first member 8. The screw 33 penetrates the screw holes 34 of the third member 24 and the second member 9 and is screwed only into the first member 8. This allows the first member 8, the second member 9, and the third member 24 to be firmly connected to each other. Examples of the screw 33 include tapping screws and bolts.

[0039] 4, the screw tool holes 34 and the through holes 11 are alternately formed at equal intervals when viewed from the third member 24 side in the direction of the center line of the cylindrical body 6. When the center line of the body 6 is taken as the center, the through holes 11 are formed on a circumference of a radius r1, and the screw tool holes 34 are formed on a circumference of a radius r2. In this embodiment, r2 is set to be larger than r1.

[0040] As shown in Figures 5 and 6, the sealed container 2 comprises a sealed terminal 1, a container body 40 having a cylindrical opening 36 into which the sealed terminal 1 is attached and around which a male thread portion 42A is formed, and a connecting ring 43 connected to the periphery of the opening 36.

[0041] In the sealed terminal 1, a flange portion 37 extending radially outward is formed on the outer peripheral surface of the main body 6. The flange portion 37 is formed on the outer peripheral surface of the first member 8 in a cylindrical shape having the same central axis as the cylinder of the first member 8 and an outer diameter larger than the outer diameter of the first member 8.

[0042] One surface of flange portion 37, which is the surface facing the third member 24, is inclined in the radial direction of main body 6 from the third member 24 side to the first member 8 side. Hereinafter, this surface will be referred to as the "flange inclined surface 37a." The other surface of flange portion 37, which is the surface facing the first member 8, engages with different diameter portion 35, which will be described later. Hereinafter, this surface will be referred to as the "flange engagement surface 37b."

[0043] The container body 40 has a cylindrical opening 36 to which the sealed terminal 1 is attached. The container body 40 accommodates an electric device 3 (for example, a three-phase AC motor pump) therein.

[0044] The opening 36 has a different diameter portion 35 formed on the inside, with the container body 40 side being smaller in diameter. The opening 36 has a two-stage structure formed of a first opening 38 and a second opening 39. The opening on the sealed terminal 1 side, which is the end side in the center line direction of the opening 36, is the first opening 38. On the other hand, the opening on the sealed container 2 side, which is the base end side, is the second opening 39. Between the first opening 38 and the second opening 39, a different diameter portion 35 is formed, which is a step between the first opening 38 and the second opening 39. The opening 36 is an opening that connects the space inside the container body 40 and the external space. In addition, a male screw portion 42A is formed on the outer circumferential surface of the opening 36.

[0045] The first opening 38 has an inner diameter set to be larger than the outer diameter of the flange portion 37. The second opening 39 is provided adjacent to the first opening 38 and closer to the base end of the opening 36 than the first opening 38, and has an inner diameter set to be smaller than the outer diameter of the flange portion 37 and larger than the outer diameter of the main body 6 excluding the flange portion 37. Therefore, the main body 6 can be inserted into the opening 36.

[0046] The main body 6 is fitted at the tip side of the flange portion 37 to the rear side of the different diameter portion 35 of the opening 36, and the container main body 40 side of the flange portion 37 is engaged with the different diameter portion 35. The end of the main body 6 on the first member 8 side is inserted into the second opening 39, and the flange engagement surface 37b of the flange portion 37 and the different diameter portion 35 are engaged in the center line direction of the opening 36. The outer diameter of the flange portion 37 is smaller than the inner diameter of the first opening 38 but larger than the inner diameter of the second opening 39. Therefore, when the end face of the first member 8 is inserted into the second opening 39 in the opening 36, the flange portion engagement surface 37b abuts against the different diameter portion 35, and the main body 6 including the first member 8 is engaged with the opening 36 in the center line direction of the opening 36.

[0047] The third seal member 41 made of an O-ring is disposed on the flange inclined surface 37a, which is the surface of the flange portion 37 facing the second member 9.

[0048] The sealed terminal 1 is fitted in the opening 36 with a third seal member 41 placed on the flange inclined surface 37a.

[0049] The connection ring 43 has a female threaded portion 42B that screws into a male threaded portion 42A formed around the opening 36, and an inward flange portion 46 that abuts against the end face of the opening 36. The connection ring 43 is cylindrical with both ends open and an internal space, and has an inward flange portion 46 on its inner circumferential surface. A groove 47 for a connection pin is formed on the outer circumferential surface near the opening at one end, and a female threaded portion 42B is formed on the inner circumferential surface near the opening at the other end.

[0050] The inward flange portion 46 is formed in an annular shape having a thickness approximately equal to that of the flange portion 37 , and extends inward from the inner circumferential wall of the connection ring 43 .

[0051] When the male threaded portion 42A and the female threaded portion are screwed together with the sealed terminal 1 attached to the opening 36, the flange portion 37 is sandwiched between the different diameter portion 35 and the inward flange portion 46. Therefore, the flange engagement surface 37b engages with the different diameter portion 35 in the center line direction of the opening 36, and the flange inclined surface 37a engages with the surface of the connection ring 43 of the inward flange portion 46 on the end side where the female threaded portion 42B is formed in the center line direction of the opening 36.

[0052] A third seal member fitting space 45 is formed by the surface of the flange portion 37 opposite the container body 40, the inner side surface of the opening 36, and the inward flange portion 46. The third seal member fitting space 45 has a triangular cross section. The triangular cross section has sides defined by the surface of the inward flange portion 46 facing the opening 36, the inner peripheral surface of the first opening 38, and the flange inclined surface 37a.

[0053] The inside of the container body 40 is sealed from the outside by fitting the third seal member 41 in the third seal member fitting space 45 .

[0054] Since the gap between the flange portion 37 and the first opening 38 is sealed by the third seal member 41, the space outside the container body 40 and the space inside the container body 40 are sealed.

[0055] Cap 44 has a cylindrical shape with one opening closed, and has a lead wire hole 48 on its side for passing second lead wire 18 through, as well as two connection pin screw holes 49 on the side near the opening. Connection pin screw holes 49 are provided on a diagonal line passing through the center line of the cylinder of cap 44.

[0056] Cap 44 is placed over connection ring 43, and connection pin 51 is inserted and fastened to align with connection pin screw hole 49 and connection pin groove 47, thereby fixing cap 44 to connection ring 43. Sealed terminal 1 is entirely covered by cap 44. Second lead wire 18 connected to connection terminal 7 in sealed terminal 1 passes through lead wire hole 48 provided in cap 44 and is connected to power source 4 outside cap 44.

[0057] In the above-described embodiment, an example has been described in which the electric device 3 separate from the container body 40 is housed inside the container body 40, but the casing of the electric device may form the container body 40, and the inside of the casing of the electric device may form the electric device 3. For example, as shown in Fig. 7, the container body 40 may be formed of the casing of a canned motor pump, and the electric device 3 may be formed inside the casing of the canned motor pump (electric motor). In this figure, the sealed terminal 1 is attached to an opening 36 formed in the casing.

[0058] According to the sealed terminal 1 in the embodiment described above, even if condensation occurs on the surface of the sealed terminal 1, the first connecting portion 12, or the second connecting portion 29, it is possible to prevent the connection terminal 7 from being short-circuited. Moreover, since the first connecting portion 12 and the second connecting portion 29 are sealed, and the connection portion between the sealed terminal 1 and the container body 40 is also sealed, it is possible to prevent water from coming into contact with the connection terminal 7 and causing a short circuit even if the entire sealed container 2 is submerged in water. [Industrial Applicability]

[0059] The present invention can be applied, for example, to electrical equipment in a sealed container. [Explanation of symbols]

[0060] 1 Sealed terminal 2 Sealed container 6 Main unit 7 Connection terminal 8 First member 9 Second member 11 Through hole 12 1st connection part 13 Large diameter section 14 General section 17 First lead wire 18 Second Lead Wire 19 Connection terminal body 22 First seal member installation space 23 First seal member 24 Third member 27 Second seal member 29 Second connection part 32 Second seal member installation space 33 Screws 35 Different diameter section 36 Opening 37 Flange 40 Container body 41 Third seal member 42A Male thread 42B Female thread 43 Connection Ring 45 Third seal member installation space 46 Inward flange

Claims

1. a main body having a first member and a second member made of an insulator connected to each other and a plurality of through holes passing through the first member and the second member; a connection terminal provided in each of the through holes and configured to connect ends of two lead wires to each other; Equipped with The through hole has a large diameter portion and a general portion formed on both sides of the large diameter portion and having an inner diameter smaller than that of the large diameter portion, the connection terminal has a connection terminal body portion provided to engage with a step occurring between the large diameter portion and the general portion of the through hole in a center line direction of the through hole, a first seal member fitting space is formed by a boundary portion between the first member and the second member and an outer circumferential surface of the connection terminal body, a first seal member is fitted into the first seal member fitting space, whereby a gap between the first member and the second member is sealed against the through hole; The outer periphery of the end surface of the first member and the end surface of the second member that are connected to each other in an opposed manner is located on the outer periphery surface of the main body. A sealed terminal characterized by:

2. The sealed terminal according to claim 1, The body further includes a third member made of an insulator connected to the second member, the through hole penetrates the first member, the second member, and the third member, a second seal member fitting space is formed by a boundary portion between the second member and the third member and an outer circumferential surface of the lead wire, a second seal member is fitted into the second seal member fitting space, whereby a gap between the second member and the third member is sealed against the through hole; A sealed terminal characterized by:

3. The sealed terminal according to claim 2, The sealed terminal, characterized in that the first member, the second member and the third member are fastened to one another using a screw.

4. A sealed terminal according to claim 2 or 3; a container body having a cylindrical opening on which the sealed terminal is attached and on which a male thread is formed around the periphery; a connecting ring having a female threaded portion that is screwed into a male threaded portion formed around the opening and an inward flange portion that abuts against an end face of the opening; A sealed container comprising: A flange portion is formed on the outer circumferential surface of the main body, the flange portion extending radially outward, A different diameter portion having a smaller diameter on the container body side is formed on the inside of the opening, The body is fitted into the opening at a tip side relative to the flange portion and a container body side of the flange portion is engaged with the different diameter portion, a third seal member installation space is formed by a surface of the flange portion opposite to the container body, an inner surface of the opening, and the inward flange portion; The third seal member is fitted into the third seal member fitting space, thereby sealing the inside of the container body from the outside of the container body. A sealed container characterized by:

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