JP2005291154A - Protection device for electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with a specification change without increasing a number of parts in a protection device used for electric motor protection of a hermetic or a semi-hermetic electric compressor in which refrigerant is circulated mainly inside a container. <P>SOLUTION: Connection terminals 4, 5 are installed and fixed spanning terminal connection portions 3B and terminal receiving portions 3C which are formed in a case 3 and installation portions 4A, 5A of the connection terminals are received in the two terminal receiving portions 3C. Conductive terminal pins 2B of a motor protector 2 are connected and fixed to welded portions 4B, 5B of the connection terminals. The two terminal receiving portions 3C can be installed even when tip shapes of the connection terminals to be received are changed with each other. This allows the case to be used as it is even when changing of the terminals are required in relation to mounting positions to a device to be protected and it is unnecessary to newly design a case. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a structure of a protection device used for protecting a motor of a hermetic type or semi-hermetic type electric compressor in which a refrigerant circulates inside a container.

  Conventionally, as a protection device used for this type of electric compressor, there is an apparatus disposed in a sealed container of a compressor through which a refrigerant flows. (For example, refer patent document 1) This protection apparatus is demonstrated referring FIG.16 and FIG.17. The protection device 101 includes a motor protector 102 (hereinafter referred to as a protector) and an electric insulating case 103 that holds the protector.

  This protector 102 has a thermally responsive contact mechanism inside a metal container (see, for example, Patent Document 2), and the metal sealed container 102A has a bimetal in response to ambient heat and internal heat generation. It contains a contact mechanism that opens and closes the contact with a thermally responsive element. Conductive terminal pins 102B and 102C electrically connected to the contact mechanism are hermetically penetrated and fixed to the sealed container 102A in an electrically insulated state.

  Connection terminals 104 and 105 are fixed to the case 103. In the connection terminals of this example, the connection terminals 104 are elastically held by the case 103, and the connection terminals 105 are fixed to the wall surface of the case by insert molding. ing. The protector 102 is fixed to the case 103 by connecting and fixing the conductive terminal pins 102B and 102C of the protector 102 to the respective connection terminals fixed to the case 103 by welding. The protector 102 is disposed on the case 103 in a predetermined posture so that one side surface of the metal hermetic container is covered with the case, and the other surface is opened to the surroundings. Therefore, heat exchange with the surrounding atmosphere can be performed satisfactorily.

  The protection device 101 is fixed to one conductive pin 111 of the sealed terminal 110 provided in the sealed housing of the sealed electric compressor. A tab terminal 112 is welded and fixed to the conductive pin 111 of the sealed terminal, and the protective device 101 is fixed to the sealed terminal 110 by inserting the connection terminal 104 of the protective device into the tab terminal and the conductive pin. The In this way, in the protective device 101 fixed in the sealed container of the electric compressor, one conductive terminal pin 102B of the protector 102 is connected to the power supply outside the sealed container via the conductive pin 111 of the sealed terminal 110, and the other A lead wire 113 connected to the motor winding is connected to the conductive terminal pin 102 </ b> C via the connection terminal 105. In this embodiment, as shown in FIG. 17, the receptacle terminal 114 at the tip of the lead wire 113 is inserted and connected to the connection terminal 105.

  In the electric compressor protection device 101 attached to the hermetic electric compressor in this way, since the metal container 102A of the protector 102 is directly arranged in the flow of the refrigerant, heat exchange with the refrigerant is performed quickly. During the operation of the electric compressor, the operating current flows through the electric circuit in the protector and the internal parts generate heat.In normal times, the amount of heat generated and the amount of heat taken away by the refrigerant are kept in an almost equilibrium state. The element does not reach the operating temperature of the contact mechanism. If any abnormality causes a decrease in heat dissipation due to an increase in refrigerant temperature or a decrease in refrigerant, or if an overcurrent flows through the protector and the thermal actuator exceeds its operating temperature, the protector is energized by opening its contact mechanism. To prevent breakage and burnout due to overheating of the electric compressor.

Japanese Patent No. 2769600 Japanese Patent No. 2519530

  In the conventional electric compressor protection device 101, connection terminals 104 and 105 are fixed in advance to the case 103, and the conductive terminal pins 102B and 102C of the protector 102 are welded to the respective connection terminals, thereby the protector 102. Is held and fixed to the case 103.

  However, in this case, the connection terminals 104 and 105 are different in shape, and one of the connection terminals 105 is insert-molded in advance with respect to the case 103. When it is desired to change the combination, it is necessary to change the shape of the terminal as well as to newly make the case 103 accordingly. For this reason, there is a problem that the number of types of cases increases by the number of types and combinations of terminals and lacks versatility.

  The present invention has been made to solve such problems of the prior art, and the object thereof is to deal with various mounting postures while taking advantage of the performance of the electric compressor protection device described in Patent Document 1. It is an object of the present invention to provide a protective device for an electric compressor having an easy structure.

  The invention described in claim 1 for achieving the above object has a motor protector having a contact mechanism in a metal sealed container and an electrically insulating case for holding the motor protector. In the protective device for an electric compressor, in which the connection terminal is mounted, and the motor protector is held and fixed in a predetermined posture with respect to the case by connecting and fixing the terminal of the motor protector to the connection terminal. And the terminal connection part, and further, there are two terminal storage parts, the terminal connection part is adjacent to the motor protector storage part, and the terminal storage part is adjacent to the terminal connection part across the partition wall. The connection terminal is mounted and fixed so as to straddle between the terminal connection portion and the terminal storage portion, and the terminal storage portion stores the distal end portion of the connection terminal, and the terminal connection portion has a mode. Conductive terminals of the protector is connected fixed to the connection terminal, the terminal accommodating portions of the two positions is an electric compressor protection device, characterized by being in the interchangeable connection terminal tip is housed at least one another.

  According to a second aspect of the present invention, there is provided the protective device for an electric compressor, wherein the two terminal storage portions have substantially the same shape.

  According to a third aspect of the present invention, there is provided the protective device for an electric compressor, wherein the two terminal storage portions are disposed substantially symmetrically with respect to the case.

  The invention of claim 4 is a protective device for an electric compressor in which two terminal storage portions have through holes, and an external terminal can be attached to a connection terminal from either opening of the through hole. is there.

  According to a fifth aspect of the present invention, there is provided a protective device for an electric compressor in which at least one connection terminal has a right / left target shape and can be accommodated in any terminal accommodating portion of the case.

  According to a sixth aspect of the present invention, there is provided an insertion portion in which a partition wall is cut out with a predetermined opening width between the terminal storage portion and the terminal connection portion of the case, and this insertion portion changes a part of the opening width. The connection terminal is held in contact with and held at a desired position of the insertion portion by adjusting the width of the communication portion of the connection terminal to the opening width at an arbitrary position of the insertion portion. Device.

  According to a seventh aspect of the present invention, there is provided the protective device for an electric compressor, wherein the through hole of the terminal accommodating portion covers the tip end portion of the connection terminal with a partition wall.

  The invention according to claim 8 is the protective device for an electric compressor characterized in that the terminal housing part is cut out at a part of its end surface to the same height as the bottom part of the insertion part.

  In the invention of claim 9, the case has one motor protector storage part, two terminal connection parts, and two terminal storage parts, and the two terminal connection parts with respect to the motor protector storage part. And the terminal connection portions are independent from each other by a partition wall, and the two terminal storage portions have substantially the same shape, and each terminal storage portion is adjacent to one of the terminal connection portions with the partition wall interposed therebetween. In addition, the terminal storage portions are independent from each other by a partition wall, and the terminal connection portion and the terminal storage portion are disposed substantially symmetrically with respect to the case, and the adjacent terminal connection portions and the terminal storage portions are adjacent to each other. The connection terminal is arranged and fixed so as to connect both, and the conductive terminal of the motor protector is connected and fixed to the connection terminal at the terminal connection part, and the terminal storage part is at least It is an electric compressor protection device according to claim that corresponds to the type of connection terminal shape.

  According to the first aspect of the present invention, since the two terminal storage portions can exchange at least the connecting terminal tip shapes stored in each other, the case can be used as it is even when the terminals are replaced. In addition, since the connection terminals are attached and fixed to the case instead of being integrally molded, the versatility of the case is improved, and the manufacture becomes easier.

  According to the second aspect of the present invention, since the terminal storage portions have substantially the same shape, even if the terminal tip shape is exchanged, the mounting condition itself for each connection terminal does not change and the handling becomes easy.

  According to the invention of claim 3, it is easier to make the shape of the connection terminal correspond to the terminal storage portions on both sides by arranging the terminal storage portions substantially symmetrically with respect to the case.

  According to the fourth aspect of the present invention, the through hole is provided in the terminal accommodating portion so that the external terminal can be attached to the connection terminal from either opening portion, so that the degree of freedom regarding the mounting posture of the protective device is improved.

  According to the invention of claim 5, it is possible to store at least one connection terminal as a right and left target shape in either terminal storage portion of the case, so that a connection with a new shape can be achieved even when the left and right connection terminals are replaced. There is no need to prepare terminals.

  According to invention of Claim 6, the insertion part between the terminal storage part of a case and a terminal connection part is notched, changing a part of opening width, and the width of a connection terminal is made into the opening width of the arbitrary parts of an insertion part. By matching, the connection terminal is held in contact at a desired position of the insertion portion.

  According to invention of Claim 7, the influence of the external force in handling can be suppressed by covering the front-end | tip part of a connecting terminal with a partition.

  According to the eighth aspect of the present invention, the terminal accommodating portion is notched to the same height as the bottom portion of the insertion portion, so that it is easy to extend the terminal in the lateral direction. .

  According to the ninth aspect of the present invention, since each of the terminal storage portions corresponds to at least two types of connection terminal shapes, the corresponding connection terminals can be prepared without changing the shape of the case. The degree of freedom of the method can be increased.

  The terminal connection portion and the terminal storage portion of the case of the electric compressor protection device are arranged substantially symmetrically, and the terminal storage portion corresponds to at least two types of terminal shapes so that the terminals can be replaced with each other. The connection terminals to be attached to the case are not fixed to the case in advance but fixed and attached later. Therefore, it is possible to select and use a plurality of types of connection terminals in one case, and it is easy to cope with switching terminal positions.

  The electric compressor protection device of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of an electric compressor protection device 1 according to the present invention, and FIG. 2 is a front view thereof. Furthermore, the state which attached the connection terminal to the case used for this electric compressor protection apparatus 1 is shown in the perspective view of FIG. 3, and the front view of FIG. FIG. 5 is a plan view of this case. The electric compressor protection device 1 includes a motor protector 2 (hereinafter simply referred to as a protector) and a case 3 that holds the motor protector 2. This protector 2 has a metal pressure-resistant sealed container 2A, and has a contact mechanism using a thermally responsive element such as a bimetal inside the sealed container. The conductive terminal pin 2B is airtightly insulated and fixed with an electrically insulating material such as glass through the sealed container 2A of the protector. The case 3 is made of an electrically insulating material such as engineering plastic, and a receptacle terminal 4 and a tab terminal 5 which are connection terminals are arranged. Each of the receptacle terminal 4 and the tab terminal 5 has a mounting portion 4A or 5A with a predetermined terminal on one side, and has a welding portion 4B or 5B on which a rib for connection with the conductive terminal pin 2B is formed on the other side. doing.

  The case 3 is formed symmetrically, and in the plan view of FIG. 1, a protector storage portion 3 </ b> A in which the protector 2 is disposed on an upper surface corresponding to the front side of the drawing, a terminal connection portion 3 </ b> B adjacent to the storage portion, A terminal accommodating portion 3C adjacent to these terminal connecting portions is provided. The terminal connection portions 3B are separated and independent in two locations by the partition walls 3L, and the terminal storage portions 3C adjacent to the respective terminal connection portions 3B are also surrounded by a peripheral edge portion 3D which is a partition wall surrounding the terminal connection portions 3B. Independent of each other. The two terminal storage portions 3C are formed as through holes having the same shape and arranged symmetrically, and both of them are provided with a sufficient electrical insulation distance between the terminals stored by the peripheral portion 3D.

  This terminal accommodating portion corresponds to at least two types of terminal shapes. In this embodiment, the terminal accommodating portion accommodates a receptacle accommodating a receptacle and inserting a tab, and accommodating a tab accommodating a receptacle. They can be used interchangeably. Between the terminal connection portion 3B and the terminal storage portion 3C, there are provided insertion portions 3E in which a peripheral edge portion 3D portion that is a partition wall is cut out with a predetermined opening width, and on both wall upper portions of each insertion portion 3E. A step 3F is provided by widening the opening width.

  The receptacle terminal 4 and the tab terminal 5 are respectively disposed across the insertion portion 3E, and each mounting portion 4A or 5A is accommodated in the terminal accommodating portion 3C. In this embodiment, the shape of the receptacle terminal 4 is such that the communication portion 4C positioned between the mounting portion 4A and the welded portion 4B is once raised upward in order to dispose the mounting portion 4A toward the lower side of the case 3. The mounting portion 4A is directed downward, and the mounting portion 4A is attached to the case so as to be inserted into the terminal storage portion 3C. Here, the width of the communication portion 4C of the receptacle terminal 4 is wider than the opening width of the lower portion of the insertion portion 3E, and is adjusted to the opening width on the step 3F. As a result, when the receptacle terminal 4 is mounted, the communication portion 4C comes into contact with the step 3F of the insertion portion and the amount of insertion can be determined. The receptacle terminal 4 is mounted such that the insertion portion 3E is elastically sandwiched between the mounting portion 4A side and the welded portion 4B side from both sides, and the mounting portion 4A elastically supports the detent 3G provided in the terminal storage portion 3C. It is fixed so that it does not fall off when the end face is locked. In the present embodiment, an example in which the detent 3G is provided on the terminal housing portion 3C side is shown, but it goes without saying that it may be provided on the terminal connection portion 23B side.

  Further, the tab terminal 5 arranged in the other terminal accommodating portion 3C is arranged with the mounting portion 5A facing upward from the terminal accommodating portion. The width of the communication portion 5C of the tab terminal matches the opening width of the lower portion of the insertion portion 3E of the case, and the communication portion 5C has the same height as the welded portion 5B. Therefore, when the tab terminal 5 is disposed in the terminal storage portion 3C, the communication portion 5C is inserted up to the lower end of the insertion portion 3E without staying on the step 3F, and therefore when the tip of the tab terminal portion is disposed upward. The tip height can be suppressed, and the height of the peripheral edge 3D covering the tab can be suppressed. Further, since it is not necessary to bend the intermediate portion many times, the depth of the terminal can be suppressed, and the terminal accommodating portion 3C need not be particularly widened. Further, the tab terminal is restricted from moving to the left and right by the side surface of the communication portion 5C hitting the insertion portion 3E, and by making the width of the front and rear of the communication portion 5C wide, The movement is regulated. Thus, the tab terminal 5 is constrained in five directions except the front side direction in FIG. Moreover, although it keeps with a protector with respect to the force to a near side, this point is mentioned later.

  The protector housing 3A of the case 3 is provided with a side wall 3H that rises along the outer peripheral shape of the protector 2 on its side surface, and further has a holding part 3J that protrudes in such a way as to hold the protector container from both sides. It has been. A contact portion 3M for positioning the protector is provided inside the side wall 3H. By attaching the protector 2 to the protector housing 3A so as to be inserted from below in FIG. 1, the protector is brought into a predetermined posture with respect to the case, and the sealed container 2A of the protector is brought into contact with the end face of the partition wall 3L and Positioning is performed by contacting the part 3M. In this state, the two conductive terminal pins 2B of the protector are respectively disposed on the welded portion 4B or 5B of the receptacle terminal and the tab terminal.

  The terminal connecting portion 3B of the case 3 is provided with a through hole 3K for welding work at a position facing the welded portions 4B and 5B of each connecting terminal. During welding work between the conductive terminal pin 2B and the welded portion of each terminal, one welding electrode is applied from the conductive terminal pin side, and at the same time, the other welding electrode is applied to the welded portion of each terminal through the through hole 3K. Enable. The protector 2 is held and fixed to the case 3 by welding the conductive terminal pins 2B of the protector 2 to the welds 4B and 5B fixed to the case. As described above, the adjacent welds 4B-5B are separated by the partition 3L and have a sufficient electrical insulation distance.

  In the receptacle terminal 4 housed in one terminal housing portion 3C of the case 3, a pin of a sealed terminal that is airtightly fixed to the sealed container of the electric compressor is inserted and connected to the connecting portion 4A. Thus, the receptacle terminal 4 is electrically connected and fixed to the sealed terminal, and the electric compressor protection device 1 is held and fixed on the sealed terminal. On the other hand, the tab terminal 5 has its connecting portion 5A accommodated in the other terminal accommodating portion 3C, and the winding of the motor or the lead wire connected to this winding is connected to this connecting portion 5A via the terminal. The

  The receptacle terminal 4 and the tab terminal 5 accommodate the respective connecting portions 4A and 5A in the terminal accommodating portion 3C of the case 3, so that the mounting portion, which is the tip portion of each terminal, is surrounded by the peripheral portion 3D serving as a partition wall. For this reason, external stress during manufacturing and handling is received by the case, and the connection terminals are reliably protected from deformation and destruction. Further, although the tab terminal 5 is not held in the front direction in FIG. 1, the protector container itself is held by providing the holding portion 3J in the case, so that it matches the restraining structure in the communication portion 5C as described above. It will not drop out. In this embodiment, the thickness of the peripheral portion 3D of the case 3 surrounding the receptacle terminal 4 and the tab terminal 5 in the vertical direction is made thicker than that of the protector storage portion 3A, for example. It goes without saying that the thickness of the peripheral edge 3D can be reduced by reducing the protruding amount of the terminal and the receptacle terminal.

  According to the present invention, when the receptacle terminal 4 and the tab terminal 5 are arranged with respect to the case 3, the receptacle terminal 4 and the tab terminal 5 are arranged through the insertion portion 3 </ b> E provided with the step 3 </ b> F to be held in another form according to the width of each terminal. can do. In addition, when changing the combination of terminals, the case is symmetrical and the shape of the insertion part and the terminal storage part are the same, and the terminal storage part is compatible with both the tab terminal and the receptacle terminal. There is no need to increase the number of types of cases themselves. In this embodiment, the terminal connection portion 3B and the terminal storage portion 3C are made independent for each connection terminal by the partition wall 3L and the peripheral edge portion 3D, respectively, as long as a sufficient electrical insulation distance can be obtained between the connection terminals. These partition walls are not necessarily required, and in that case, for example, the terminal accommodating portion can be integrated.

  Next, another embodiment of the present invention will be described with reference to FIGS. 6 is a plan view of the protective device 21 for an electric compressor according to the present invention, FIG. 7 is a plan view of the case, and FIG. 8 is a perspective view showing a state in which a terminal is attached to the case of FIG. FIG. 9 is a cross-sectional view taken along lines AA and BB in FIG. 6 showing how the protector is attached, and FIG. 10 is a plan view for explaining a state where the protective device is connected to the target device. The case 23 of this embodiment is formed of an electrically insulating material such as engineering plastic as in the above-described example, and is provided with a receptacle terminal 24 and a tab terminal 25 which are connection terminals. Each of the receptacle terminal 24 and the tab terminal 25 has a mounting portion 24A or 25A with a predetermined terminal on one side, and the welded portion 24B or 25B on which the rib for connection to the conductive terminal pin 2B of the protector 2 is formed on the other side. have. In this embodiment, the welded portions 24B and 25B are arranged symmetrically with respect to the center line of each terminal, so that each terminal has a symmetrical shape.

  The case 23 is formed symmetrically, and in the plan view, a protector storage portion 23A in which the protector 2 is disposed on the front side, two terminal connection portions 23B adjacent to the storage portion, and these terminal connections A terminal accommodating portion 23C adjacent to the portion is provided. The terminal connection portions 23B are independent from each other by the partition walls 23L, and the terminal storage portions 23C adjacent to the respective terminal connection portions 23B are also independent from each other by a peripheral edge portion 23D that is a partition wall surrounding the terminal storage portions 23C. The two terminal storage portions 23C are formed as through holes having the same shape symmetrically arranged with respect to the center of the case 23, and both of them can sufficiently take an electrical insulation distance between the terminals stored by the peripheral portion 23D. Has been.

  This terminal accommodating portion 23C also corresponds to at least two types of terminal shapes as in the above example. In this embodiment, both the one that accommodates the receptacle and inserts the tab and the one that accommodates the tab and inserts the receptacle can be used interchangeably. Between the terminal connection portion 23B and the terminal storage portion 23C, there is provided an insertion portion 23E in which a peripheral edge portion 23D portion that is a partition wall is cut out with a predetermined opening width. In this embodiment, the first embodiment described above is used. In this way, the depth is about the thickness of the terminal without being deeply cut out.

  The receptacle terminal 24 and the tab terminal 25 are disposed across the insertion portion 23E, and the respective mounting portions 24A or 25A are accommodated in the terminal accommodating portion 23C. In the present embodiment, the shape of the receptacle terminal 24 is such that the communication portion 24C is once raised upward and the attachment portion 24A is directed downward, as in the previous example, and the attachment portion 24A is accommodated in the terminal. It is attached to the case so as to be inserted into the portion 23C.

  As shown in FIG. 9, the terminal accommodating portion 23C is wide at the upper portion and narrowed at the lower portion, and the lower portion is the receptacle accommodating portion 23F as shown in FIG. 6 and its sectional view taken along the line AA in FIG. 9 (A). At least the tip of the terminal mounting portion 24A is stored and held. Therefore, the case 23 is restricted from moving in the lateral direction of the mounting portion 24A when the receptacle terminal 24 is mounted on a tab terminal or the like of the target device. The receptacle terminal 24 is mounted so that the insertion portion 23E of the case is elastically sandwiched between the mounting portion 24A side and the welding portion 24B side from both sides, and the detent 23G provided in the terminal storage portion 23C is attached to the detent 23G. It is held and fixed so that it does not fall off when the end face is applied. Note that the detent 23G provided on the terminal accommodating portion 23C side can be provided on the terminal connecting portion 23B side as in the above-described example, but it goes without saying that this point is the same in the tab terminal described later.

  Further, in this embodiment, the tab terminal 25 arranged in the other terminal storage portion 23C is connected to the communication portion as in the case of the receptacle terminal 24, as shown in FIG. 6 and FIG. 25C is bent so as to straddle the insertion portion 23E of the case, and the tip of the mounting portion 25A once downward is bent upward. The tab terminal 25 is also elastically attached to the insertion portion 23E like the receptacle terminal, and the wide portion 25D provided on the attachment portion side is prevented from falling off by hitting the detent 23G. Further, the tab terminal mounting portion 25A is housed in a wide portion above the terminal housing portion 23C so that the receptacle terminal does not interfere with the terminal housing portion 23C when the receptacle terminal is mounted on the tab terminal 25.

  The side wall 23H is provided on the side surface of the protector storage portion 23A of the case 23 in the same manner as in the above example, and the contact portion 23J that supports the container of the protector 2 on the side surface and suppresses the tilt is provided inside the storage portion 23A. It has been. Further, an abutting portion 23M for positioning where the end face of the protector hits is provided inside the side wall 23H. The inner shape of the protector housing 23A and the side wall 23H is substantially in line with the outer periphery of the protector container. By attaching the protector 2 to the protector housing 23A, the protector is set in a predetermined posture with respect to the case, and the protector's sealed container is brought into contact with the contact portion 23J, the end surface of the partition wall 23L, and the contact portion 23M. Positioned with. In this state, the two conductive terminal pins 2B of the protector are arranged on the welded portions 24B or 25B of the receptacle terminal and the tab terminal, respectively.

  The terminal connection part 23B of the case 23 is provided with a through hole 23K for welding work, and welding work is enabled by applying a welding electrode to each welded part through the through hole 23K. Thus, the protector 2 is held and fixed to the case 23 by welding the conductive terminal pins 2B of the protector 2 to the respective terminals fixed to the case.

  In this embodiment, as shown in FIG. 10, the connecting terminal 24 </ b> A of the receptacle terminal 24 accommodated in one terminal accommodating part 23 </ b> C of the case 23 has a sealed terminal pin hermetically fixed to the sealed container of the electric compressor. A tab terminal 32 fixed to 31 is inserted from the other side of the figure toward the near side and connected and held. Thus, the receptacle terminal 24 is electrically connected and fixed to the sealed terminal, and the electric compressor protection device 21 is held and fixed on the sealed terminal. On the other hand, the connecting portion 25A of the tab terminal 25 housed in the other terminal housing portion 23C is connected to the winding of the motor or the lead wire connected to this winding through the receptacle terminal 33. The receptacle terminal 33 is inserted from the front of the figure, and the amount of insertion is determined by hitting the bent portion of the connecting portion or the step of the terminal accommodating portion 23C. The upper portion of the terminal storage portion 23C is wider than the lower receptacle storage portion 23F, and the receptacle terminal 33 can be attached to the connection portion 25A formed by bending the tab terminal 25. Furthermore, by making the inner surface of the terminal accommodating portion 23C follow the peripheral edge portion of the receptacle terminal 33, it is possible to suppress the movement of the terminal and increase the holding force against vibration or the like.

  In the present embodiment, the receptacle terminal 24 and the tab terminal 25 are both symmetrically formed including the welded portion, and the mounting method to the case is also the same. For this reason, it is possible to attach the terminal 23 to either terminal housing portion 23 </ b> C. For example, the positional relationship between the receptacle and the tab in FIG. 6 can be interchanged, and the same terminal can be used for both if necessary. According to this embodiment, even if it is necessary to replace the terminals, it is not necessary to prepare the terminals separately on the left and right sides as well as the case, so it is possible to cope with the specification change without creating new parts. .

  In each of the above-described embodiments, the shape of the tab terminal is limited to the terminal accommodating portion that is a through hole, so that it is difficult to pull it out in the lateral direction. Accordingly, an example in which the degree of freedom of the terminal shape is increased as a third embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a plan view of the electric compressor protection device 41. Components similar to those in the above-described example are denoted by the same reference numerals, and detailed description thereof is omitted. 12 is a cross-sectional view taken along the line CC and the line DD in FIG. 11 showing the attachment state of the protector, and FIG. 13 is a perspective view showing the state where the terminal is attached to the case. This electric compressor protection device 41 uses the same protector 2 as in the above example. The protector 2 is held and fixed on a case 43 made of an electrically insulating material. The protector 2 disposed in the protector storage portion 43A of the case is held on the case by holding the container by the holding portion 43J and welding the conductive terminal pin 2B to the tab terminal 44 or the receptacle terminal 24 which are connection terminals. Fixed. The case 43 has a structure in which the left and right connection terminals can be interchanged, and therefore has a symmetrical structure.

  The shape of the protector storage portion 43A of the case 43 and the terminal connection portion 43B adjacent to the protector storage portion 43A is substantially the same as the case shown in the first embodiment, and welding electrodes are respectively attached to the two terminal connection portions 43B divided by the partition wall 43L. A through hole 43K for insertion is provided. On the other hand, the shape of the terminal accommodating portion side is different from the above-described one, and the case outer portion of the peripheral portion 43M of the terminal accommodating portion 43C that is a through hole for accommodating the connecting portion of the receptacle terminal 24 is provided. The difference is that the two sides are greatly cut in the height direction. The other part of the peripheral part is the peripheral partition part 43D with the same height as in the above example, and functions as a partition between adjacent terminal storage parts or between the terminal storage part and the terminal connection part. The partition wall 43D is provided with an insertion portion 43E through which the receptacle terminal 24 and the tab terminal 44, which are connection terminals, pass with a predetermined opening width. In addition, a stepped portion 43F having an enlarged opening width is provided on the upper portion of the insertion portion 43E as in the above example. The two terminal storage portions 43C in the present embodiment have different positional relationships such as partition walls, but have substantially the same shape only by being arranged on the left and right sides in relation to the pull-out direction of the tab terminals described later. .

  The terminal accommodating portion 43C is a through hole, and the receptacle terminal 24 has a mounting portion 24A inserted in the terminal accommodating portion as shown in FIG. Further, the insertion amount of the receptacle terminal is determined when the communication portion 24C comes into contact with the step 43F of the insertion portion. Further, the insertion part 43E of the case is elastically sandwiched between the mounting part 24A side and the welding part 24B side, and at the same time, the end surface of the mounting part 24A does not fall off the case 43 by contacting the detent 43G. So that it is fixed.

  As shown in FIG. 12A and the like, the tab terminal 44 of this embodiment is substantially flush with the mounting portion 44A to the welding portion 44C, and the communication portion 44B is narrower than the width of the lower portion of the insertion portion 43E. It contacts the bottom of the insertion part 43E. Thus, the tab terminal 44 is arranged along the upper surface of the terminal accommodating portion 43C of the case 43.

  In the present embodiment, the end surface of the peripheral edge portion 43M of the terminal accommodating portion 43C is cut out to the same height as the bottom portion of the insertion portion in this way, so that the tab terminal mounting portion is attached to the case. Can be pulled out horizontally. The pull-out direction of the tab terminal mounting portion is not limited to the direction shown in the figure. For example, the tab terminal may be pulled straight up to be pulled upward in FIG. It may be bent in the vertical direction from the storage portion. Note that the tab terminal 44 is shown as being simply attached to the insertion portion 43E from above. For example, a notch or a projection is provided in the insertion portion, and the tab terminal is engaged therewith and then welded to the protector 2. Thus, the burden on the welded portion of the tab terminal and the protector can be dispersed.

  In this embodiment, the receptacle terminal 24 is widened to the left and right to widen the welded portion 24B in the same manner as in the second embodiment described above, and the entire terminal is bilaterally symmetric, and can be welded at either end of the welded portion 24B. According to this structure, the receptacle terminal 24 can be welded and fixed regardless of whether the receptacle terminal 24 is disposed in the left or right terminal accommodating portion 43C with respect to the case 43. Therefore, when the position of the receptacle terminal needs to be changed, the same receptacle terminal is used. Can be used, and parts can be shared. Further, for example, when the tab terminal has a symmetric structure without bending in the lateral direction, the welded portion can be shared as a similar structure.

  In this embodiment, the example in which the height of the peripheral portion of the terminal storage portion is cut across two sides in order to increase the degree of freedom of the shape of the tab terminal has been described. If the direction is limited to a specific direction, a structure in which only one side on the straight line of the terminal connection portion and the terminal storage portion considering only the compatibility between the tab terminal and the receptacle terminal may be deleted. The tab terminal holding method is not limited to that of the embodiment, and may be a structure that is elastically attached to the receptacle terminal or the insertion portion 43E of the case as in the second embodiment described above.

  In each of the above-described embodiments, the case where the terminal storage portion is arranged substantially in the left and right direction with respect to the case has been described as an example. However, if it is possible to replace each terminal tip shape, for example, electric compression shown in FIG. Like the machine protection device 61, the positional relationship between the terminal storage portions 63A and 63B of the case 63 may be shifted. In this embodiment, one connection terminal is the same receptacle terminal 4 as in the first embodiment, and the other connection terminal 65 has a tip shape as a tab terminal. However, it is described above that the tip shapes can be interchanged. This is the same as the example. The receptacle terminal 4 is elastically mounted and fixed so as to exceed one insertion portion 63C of the case at the connecting portion 4C as in the above-described embodiment. The connecting portion 65A of the tab terminal 65A is flush with the welded portion 65B and abuts against the bottom of the other insertion portion 63D. Since the other points are the same except that the positional relationship of the terminal storage portion is different and the length of the connecting portion of the connection terminal is different, detailed description is omitted.

  Further, in each of the above-described embodiments, the receptacle terminal having a thin plate thickness has been described mainly with the terminal housing portion surrounded by a partition wall to prevent deformation due to external stress. However, the through hole is not necessarily required. Instead, for example, an electric compressor protection device 71 shown in FIG. 15 may hold the tip of the connection terminal so as to be sandwiched between the partition walls. The case 73 of the electric compressor protection device 71 has a terminal housing portion 73A that is not a through-hole shape that covers the entire periphery of the terminal tip portion with a partition wall, and is configured such that the tip of the receptacle terminal 4 is sandwiched between the inner surfaces of the partition wall. Since one surface 73B is opened in accordance with the width of the tab terminal, the tab terminal 75 can be inserted in the lateral direction. According to the present embodiment, the influence of external force on the receptacle terminal can be received by the partition wall without using the terminal housing portion as a through hole, and the tab terminal is also held by the insertion portion 73C and the opening portion 73B of the case. In particular, it is firmly held against lateral forces.

  In each of the above-described embodiments, the two terminal storage portions have been described in which the terminal tip shapes stored in the respective terminal storage portions can be interchanged. However, each terminal storage portion may correspond to at least two types of connection terminal shapes. it can. For example, when it is desired to have a structure in which only one of the terminal storage portions pulls out the tab terminal horizontally, one terminal storage portion may have the shape of the first embodiment and the other has the shape of the third embodiment. In this way, each terminal accommodating portion corresponds to a plurality of terminal tip shapes, so that the degree of freedom of the protective device mounting method can be increased by preparing a corresponding connection terminal without changing the shape of the case. .

  As described above, according to the protection device for an electric compressor of the present invention, the terminal storage portions at two locations on the case can be replaced at least by connecting the tip shapes of the connection terminals stored in each other. The case can be used as it is. In addition, since the connection terminals are attached and fixed to the case instead of being integrally molded, the versatility of the case is improved, and the manufacture becomes easier.

  Moreover, it becomes easier to make the shape of the connection terminal correspond to the terminal accommodating parts on both sides by making the terminal accommodating parts the same shape or arranging them on the left and right sides. Furthermore, by making each connection terminal symmetrical, it becomes possible to minimize variations of parts including the connection terminals.

  By providing a through-hole in the terminal housing and making it possible to attach an external terminal to the connection terminal from either opening, the degree of freedom regarding the mounting orientation of the protective device is improved and it can be used for more protected devices. It becomes possible.

  Further, by changing the opening width of the insertion portion on the case partially, and adjusting the width of the connection terminal passing through the insertion portion to a predetermined position of the opening width, the contact position and posture of the connection terminal on the case are determined. be able to. In addition, by cutting out a part of the end surface of the terminal storage part provided in the case to the same height as the bottom part of the insertion part, it is possible to increase the degree of freedom of the shape of the connection terminal and cope with various mounting methods. it can.

  Moreover, by making each terminal accommodating part correspond to at least two types of terminal shapes, one type of case can be made compatible with a plurality of attachment methods by changing the combination of connection terminals. For this reason, it is not necessary to increase the number of types of cases for each mounting method, so that the versatility of parts can be increased and the manufacturing cost can be reduced.

The top view which shows 1st Example of the protection apparatus for electric compressors of this invention Front view of the protective device for the electric compressor of FIG. The perspective view which shows the state which attached the connection terminal to the case used for the electric compressor protection apparatus of FIG. The front view which shows the state which attached the connection terminal to the case used for the electric compressor protection apparatus of FIG. The top view of the case used for the electric compressor protection apparatus of FIG. The top view which shows 2nd Example of the protection apparatus for electric compressors of this invention. The top view of the case used for the electric compressor protection apparatus of FIG. The perspective view which shows the state which attached the connection terminal to the case used for the electric compressor protection apparatus of FIG. The AA sectional view and BB sectional view of the protection device for electric compressors of FIG. The top view which shows the state which connected the protection apparatus for electric compressors of FIG. 6 to the object apparatus. The top view which shows 3rd Example of the protection apparatus for electric compressors of this invention. CC sectional drawing and DD sectional drawing of the protection apparatus for electric compressors of FIG. The perspective view which shows the state which attached the connection terminal to the case used for the electric compressor protection apparatus of FIG. The top view which shows 4th Example of the protection apparatus for electric compressors of this invention. The top view which shows 5th Example of the protection apparatus for electric compressors of this invention. The top view which shows the attachment state of the conventional electric compressor protection apparatus. The side view which shows the attachment state of the electric compressor protection apparatus of FIG.

Explanation of symbols

1, 21, 41, 61, 71: Electric compressor protection device 2: Motor protector 3, 23, 43, 63, 73: Case 3B, 23B, 43B: Terminal connection part 3C, 23C, 43C, 63A, 63B, 73A : Terminal housing parts 3E, 23E, 43E, 63C, 63D, 73B: Insertion parts 3G, 23G, 43G: Detent 3J, 43J: Holding part 4, 24: Receptacle terminal 4A, 24A: Mounting part 4B, 24B: Welding part 4C, 24C, 44B: Communication portions 5, 25, 44: Tab terminals 5A, 25A: Mounting portions 5B, 25B: Welded portions 5C, 25C, 44B, 65A: Communication portions 23F: Receptacle storage portion 23J: Contact portion 25D: Wide part

Claims (9)

A motor protector having a contact mechanism in a metal sealed container and an electrically insulating case for holding the motor protector;
A connection terminal is attached to the case,
In the protective device for an electric compressor in which the motor protector is held and fixed in a predetermined posture with respect to the case by connecting and fixing the terminal of the motor protector to the connection terminal,
The case has a motor protector storage part and a terminal connection part, and further two terminal storage parts,
The terminal connection is adjacent to the motor protector storage,
Furthermore, the terminal storage part is adjacent to the terminal connection part across the partition,
The connection terminal is mounted and fixed across the terminal connection part and the terminal storage part,
The terminal storage part houses the tip of the connection terminal,
At the terminal connection, the motor protector's conductive terminal is connected and fixed to the connection terminal.
The protective device for an electric compressor, wherein the two terminal storage portions are configured so that at least the connection terminal tips stored in each other can be exchanged. The protective device for an electric compressor according to claim 1, wherein the two terminal storage portions have substantially the same shape. The protective device for an electric compressor according to claim 2, wherein the two terminal storage portions are disposed substantially symmetrically with respect to the case. The two terminal storage portions have through holes, and the external terminals can be attached to the connection terminals from either opening of the through holes. The protective device for electric compressors as described in 2. 5. The electric compressor according to claim 1, wherein at least one connection terminal has a right / left target shape and can be accommodated in any terminal accommodating portion of the case. 6. Protection device. Between the terminal storage part and the terminal connection part of the case, there is provided an insertion part in which a partition wall is cut out with a predetermined opening width,
This insertion part has a part of its opening width changed,
The connection terminal is held in contact with a desired position of the insertion portion by matching the width of the communication portion of the connection terminal with the opening width at an arbitrary position of the insertion portion. The protective device for an electric compressor according to Item. The protective device for an electric compressor according to any one of claims 1 to 6, wherein the through hole of the terminal housing portion is formed by covering a tip portion of the connection terminal with a partition wall. The protective device for an electric compressor according to any one of claims 1 to 7, wherein a part of an end surface of the terminal storage portion is cut out to the same height as a bottom portion of the insertion portion. A motor protector having a contact mechanism in a metal sealed container and an electrically insulating case for holding the motor protector;
A connection terminal is attached to the case,
In the protective device for an electric compressor in which the motor protector is held and fixed in a predetermined posture with respect to the case by connecting and fixing the terminal of the motor protector to the connection terminal,
The case has one motor protector storage part, two terminal connection parts, and two terminal storage parts,
The two terminal connection portions are adjacent to the motor protector storage portion and the terminal connection portions are independent from each other by a partition wall.
Further, the two terminal storage portions have substantially the same shape,
Each terminal storage part is adjacent to one of the terminal connection parts across the partition wall, and the terminal storage parts are independent from each other by the partition wall,
The terminal connection part and the terminal storage part are respectively arranged substantially symmetrically with respect to the case,
Between each adjacent terminal connection part and the terminal storage part, the connection terminal is mounted and fixed across both,
At the terminal connection, the motor protector's conductive terminal is connected and fixed to the connection terminal.
Each of the terminal storage portions corresponds to at least two types of connection terminal shapes.

Images