JP4458065B2 - Electromagnetic switchgear - Google Patents

Description

  The present invention relates to an electromagnetic switching device including an electromagnet device having an exciting winding and a contact device that opens and closes in synchronization with the energization of the exciting winding.

  Conventionally, as this type of electromagnetic switching device, as shown in FIG. 13, an internal unit A provided with an electromagnet device 1 and a contact device 2 is provided in a case X made of an insulating material such as a synthetic resin. Has been.

  The electromagnet apparatus 1 shown in FIG. 13 includes an excitation winding 3 wound around a coil bobbin 4, a fixed iron core 6 that forms a part of a magnetic path through which a magnetic flux generated by the excitation winding 3 passes, and a fixed iron core 6. And a movable iron core 7 that is movable between a position that abuts against the fixed iron core 6 and a position that moves away from the fixed iron core 6. The iron core 7 comes and goes. Furthermore, the electromagnet device 1 is provided with a yoke 5 that forms a magnetic path through which the magnetic flux generated by the exciting winding 3 passes along with the fixed iron core 6 and the movable iron core 7. Here, the movable iron core 7 is provided with a movable contact 33 provided with a pair of movable contacts 34 so that the contact device 2 is opened and closed in conjunction with the movement of the movable iron core 7. 19 are connected.

A fixed contact 31 is disposed opposite to each movable contact 34. When the movable iron core 7 is in contact with the fixed iron core 6, the contact device 2 composed of the movable contact 34 and the fixed contact 31 is closed. Made. On the other hand, the contact device 2 is opened when the movable iron core 7 is separated from the fixed iron core 6 by the spring force of the return spring 13 provided between the fixed iron core 6 and the movable iron core 7. The electromagnetic switching device shown in FIG. 13 is a so-called sealed contact device in which the contact device 2, the fixed iron core 6, and the movable iron core 7 are accommodated in an airtight space (see, for example, Patent Document 1).
JP-A-11-232986 (page 3-4, FIG. 1)

  Incidentally, in the electromagnetic switching device, heat is generated in the excitation winding 3 when the excitation winding 3 is energized. However, in a general electromagnetic switching device, as shown in FIG. Only the coil bobbin 4 is present, and no measures are taken to dissipate the heat generated in the exciting winding 3. Therefore, the heat generated in the exciting winding 3 is mainly radiated into the air, and the heat dissipation efficiency is low. Especially when the energizing winding 3 is energized continuously, the exciting winding 3 The temperature of the line 3 increases.

  This invention is made | formed in view of the said reason, Comprising: It aims at providing the electromagnetic switching device which can suppress the temperature rise of the coil | winding for excitation at the time of electricity supply.

According to the first aspect of the present invention, the exciting winding formed in a cylindrical shape, the fixed iron core disposed inside the exciting winding, and the fixed iron core are excited side by side in the axial direction of the exciting winding. Surrounding the exciting winding and the movable iron core that is arranged inside the winding for winding, and is moved to the axial direction of the exciting winding by being attracted to the fixed iron core when energization to the exciting winding is turned on and off In this way, an electromagnet device having a yoke that is arranged outside the exciting winding and through which the magnetic flux generated by the exciting winding passes is formed together with the fixed iron core and the movable iron core, and for the movement of the movable iron core A contact device having contacts that open and close in conjunction with each other. Between the outer peripheral surface of the excitation winding and the yoke, heat generated in the excitation winding is energized when the excitation winding is energized. a heat transfer member for conducting is provided, the heat transfer member is sandwiched between the excitation winding and the yoke made of a material having rubber elasticity Iruko The features.

  According to this configuration, since the heat transfer member is provided between the excitation winding and the yoke, the heat generated in the excitation winding when the excitation winding is energized passes through the heat transfer member. Accordingly, heat is radiated from the yoke, and therefore, temperature rise during energization of the exciting winding can be suppressed. The upper limit of the ambient temperature range in which the electromagnetic switching device can be used continuously (hereinafter referred to as the operating temperature range) is the ambient temperature of the electromagnetic switching device plus the temperature rise during continuous energization of the excitation coil Although the temperature is set to be equal to or lower than the predetermined temperature, according to the configuration of claim 1, the temperature rise during continuous energization of the excitation winding can be suppressed small, so the upper limit value of the operating temperature range is set higher than that of the conventional configuration. There is an advantage that the temperature can be set high and the operating temperature range can be expanded.

In addition, since the heat transfer member is made of a material having rubber elasticity and is sandwiched between the excitation winding and the yoke, the heat transfer member is in close contact with both the excitation winding and the yoke, Heat generated in the exciting winding is easily conducted to the yoke via the heat transfer member. Accordingly, it is possible to further suppress a temperature rise when the exciting winding is energized.

According to a second aspect of the present invention, in the first aspect of the present invention, the heat transfer member is provided with a protrusion protruding from the surface facing the yoke, the tip surface of which is in contact with the yoke. It is fitted between iron, and the protrusion is compressed in the protruding direction when the heat transfer member is fitted between the yoke and the exciting winding.

  According to this configuration, since the protrusion is compressed in the protruding direction when the heat transfer member is fitted between the yoke and the excitation winding, the protrusion is transferred between the excitation winding and the yoke. It becomes easy to fit the heat member.

The invention of claim 3 is characterized in that, in the invention of claim 2 , the protrusion is formed such that the width dimension is larger toward the tip end side.

  According to this configuration, since the width of the protrusion is larger toward the tip side, a large contact area between the protrusion and the yoke can be ensured. As a result, the heat of the ridges easily escapes to the yoke, and the temperature gradient between the portion of the heat transfer member that contacts the excitation winding and the ridge increases, so that the excitation windings are provided while the ridges are provided. Heat generated in the wire is easily conducted to the yoke via the heat transfer member. Accordingly, it is possible to further suppress a temperature rise when the exciting winding is energized.

According to a fourth aspect of the present invention, in the second aspect of the invention, the protrusion has a contact portion that contacts the yoke, and a support portion that is formed to have a width smaller than the contact portion and supports the contact portion. The heat transfer member has a protrusion that protrudes from the side of the support portion in the width direction, and that contacts the contact portion when the support portion is compressed.

  According to this configuration, the heat conducted from the excitation winding to the heat transfer member is conducted to the contact portion through both the support portion and the protrusion, and therefore, compared with the case without the protrusion, The cross-sectional area of the path through which heat is conducted between the winding and the yoke can be assured as the projection. Therefore, heat is easily conducted from the exciting winding to the yoke, and the temperature rise when the exciting winding is energized can be further suppressed.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, the protrusion protrudes from both side surfaces in the width direction of the support portion, and an auxiliary protrusion that contacts the protrusion when the support portion is compressed is formed. It is characterized by.

  According to this configuration, when the auxiliary protrusion is formed, the heat conducted from the exciting winding to the heat transfer member is conducted to the contact portion through the support portion and the protrusion, and is also conducted through the auxiliary protrusion. Therefore, as compared with the case where there is no auxiliary projection, the cross-sectional area of the path through which heat is conducted between the exciting winding and the yoke can be ensured by the amount of the auxiliary projection. Therefore, heat is easily conducted from the exciting winding to the yoke, and the temperature rise when the exciting winding is energized can be further suppressed.

The invention according to claim 6 is the yoke according to any one of claims 1 to 5 , wherein the heat transfer member is disposed between the yoke and a part of the outer peripheral surface of the exciting winding. It has a side plate, The heat-transfer member is formed in the shape which contacts two or more surfaces of a yoke side plate, It is characterized by the above-mentioned.

  According to this structure, compared with the case where a heat-transfer member contacts only one surface of a yoke side plate when a heat-transfer member contacts 2 or more surfaces of a yoke side plate, a heat-transfer member and a yoke side plate As a result, heat can be easily transferred from the heat transfer member to the yoke, and the temperature rise during energization of the exciting winding can be further suppressed.

The invention of claim 7 is the invention according to any one of claims 1 to 6 , wherein the heat transfer member extends so as to surround the excitation winding in a plane orthogonal to the axial direction of the excitation winding. And an arm portion that contacts the exciting winding.

  According to this configuration, since the heat transfer member has the arm portion, it is possible to secure a larger contact area between the exciting winding and the heat transfer member than the arm portion does not have the arm portion. . Therefore, heat is easily conducted from the exciting winding to the heat transfer member, and the temperature rise when the exciting winding is energized can be further suppressed.

The invention of claim 8 is characterized in that, in the invention of claim 7 , the heat transfer member has a reinforcing portion that presses the arm portion against the exciting winding.

  According to this configuration, since the arm portion is pressed against the exciting winding by the reinforcing portion, the exciting winding and the arm portion can be brought into close contact with each other, and heat is more conducted from the exciting winding to the heat transfer member. It becomes easy.

The invention of claim 9 is the invention according to any one of claims 1 to 8 , wherein the electromagnet device is housed in a box-like case, and the case energizes a part of the heat transfer member. It has the press part pressed on the coil | winding for an inner periphery, It is characterized by the above-mentioned.

  According to this configuration, since a part of the heat transfer member is pressed against the excitation winding by the pressing portion, a part of the heat transfer member and the excitation winding can be brought into close contact with each other. Heat is more easily conducted to the heat member.

The invention of claim 10 is the invention according to any one of claims 1 to 9 , wherein the yoke is a yoke upper plate and a yoke lower plate arranged on both sides in the axial direction of the exciting winding. A yoke side plate for connecting edges of the yoke upper plate and the yoke lower plate, and the heat transfer member is disposed between the exciting winding and the yoke side plate, and the yoke It is in contact with at least one of the upper plate and the yoke lower plate.

  According to this configuration, the heat transfer member is provided on at least one of the upper yoke plate and the lower yoke plate as compared with the configuration in which the heat transfer member is merely disposed between the exciting winding and the yoke side plate. Since the contact area between the heat transfer member and the yoke can be increased by the amount of contact, heat is easily transferred from the heat transfer member to the yoke, and the temperature rises when the excitation winding is energized. Can be further suppressed. Furthermore, since the heat transfer member is in contact with at least one of the yoke upper plate and the yoke lower plate, the movement of the heat transfer member in the axial direction of the excitation winding is restricted, and electromagnetic switching Even when vibration or impact is applied to the apparatus, the heat transfer member is less likely to be displaced.

  In the present invention, since the heat transfer member is provided between the excitation winding and the yoke, the heat generated in the excitation winding when the excitation winding is energized is relayed via the heat transfer member. Thus, heat is dissipated from the iron, so that the temperature rise during energization of the exciting winding can be suppressed. The upper limit of the ambient temperature range in which the electromagnetic switching device can be used continuously (hereinafter referred to as the operating temperature range) is the ambient temperature of the electromagnetic switching device plus the temperature rise during continuous energization of the excitation coil Although the temperature is set to be equal to or lower than the predetermined temperature, according to the configuration of claim 1, the temperature rise during continuous energization of the excitation winding can be suppressed small, so the upper limit value of the operating temperature range is set higher than that of the conventional configuration. There is an advantage that the temperature can be set high and the operating temperature range can be expanded.

  In the following embodiments, a sealed contact device in which a contact device, a fixed iron core, and a movable iron core are housed in an airtight space in the same manner as described as a conventional configuration will be described as an example of an electromagnetic switching device. Therefore, the contact device, the fixed iron core, and the movable iron core need not be sealed.

(Embodiment 1)
The electromagnetic switching device of the present embodiment is one in which an inner unit A having an electromagnet device 1 and a contact device 2 is housed in a synthetic resin case X, and the basic configuration of the inner unit A is shown in FIG. Therefore, the configuration of each part of the inner unit A will be described in more detail than the conventional configuration, with reference to FIG.

  The electromagnet device 1 includes a fixed member including the exciting winding 3 formed in a cylindrical shape, and a movable member disposed so as to face the fixed member. In addition to the exciting winding 3, the fixing member is made of synthetic resin and has a cylindrical coil bobbin 4 around which the exciting winding 3 is wound, and a yoke 5 made of a magnetic metal material and surrounding the coil bobbin 4. And a fixed iron core 6 disposed inside the coil bobbin 4. The movable member includes a movable iron core 7 that is arranged alongside the fixed iron core 6 in the vertical direction that is the axial direction of the coil bobbin 4 inside the coil bobbin 4. The fixed iron core 6 and the movable iron core 7 together with the yoke 5 form a magnetic path through which the magnetic flux generated by the exciting winding 3 passes. The coil bobbin 4 has a pair of flanges 8 facing in the vertical direction on both the upper and lower sides of the excitation winding 3.

  The yoke 5 includes a yoke upper plate 9 that contacts the upper end surface of the coil bobbin 4, a yoke lower plate 10 that contacts the lower end surface of the coil bobbin 4, and left and right ends of the yoke upper plate 9 and the yoke lower plate 10. It is comprised with a pair of yoke side plate 11 which connects each edge | edge, and is open | released in the front-back direction (direction orthogonal to a paper surface in FIG. 13). The yoke lower plate 10 and the pair of yoke side plates 11 are integrally formed by bending one plate.

  Further, the fixed member has a guide cylinder 12 made of a nonmagnetic material and formed in a bottomed cylindrical shape with an upper surface opening between the fixed iron core 6 and the movable iron core 7 and the coil bobbin 4. In other words, the fixed iron core 6 and the movable iron core 7 are accommodated in the guide cylinder 12 provided inside the coil bobbin 4. The fixed iron core 6 is disposed on the opening side of the guide cylinder 12. Furthermore, the fixed iron core 6 and the movable iron core 7 are each formed in a cylindrical shape whose outer diameter is approximately the same as the inner diameter of the guide cylinder 12, and the movable iron core 7 can move straight in the axial direction of the guide cylinder 12. ing. The moving range of the movable iron core 7 is set between an initial position away from the fixed iron core 6 and a contact position where the movable iron core 7 contacts the fixed iron core 6. Between the fixed iron core 6 and the movable iron core 7, a return spring 13 made of a coil spring and having a spring force for returning the movable iron core 7 to the initial position is interposed.

  Further, a fitting hole 14 into which the upper end portion of the fixed iron core 6 is fitted is provided at the center of the yoke upper plate 9 so that the fixed iron core 6 is fixed to the yoke upper plate 9. Further, the guide cylinder 12 has an opening peripheral portion fixed to the periphery of the fitting hole 14 on the lower surface of the yoke upper plate 9 and a lower end portion in the holding hole 23 provided in the central portion of the yoke lower plate 10. Is inserted. Here, the movable iron core 7 housed in the lower portion of the guide tube 12 is magnetically coupled to the peripheral portion of the holding hole 23 in the yoke lower plate 10.

  According to the configuration described above, when the excitation winding 3 is energized, the opposed surface of the fixed iron core 6 to the movable iron core 7 and the peripheral portion of the holding hole 23 in the yoke lower plate 10 are a pair of magnetic pole portions. Will be magnetized with different polarities. Therefore, when the exciting winding 3 is energized, the movable iron core 7 and the fixed iron core 6 magnetically coupled to the periphery of the holding hole 23 in the yoke lower plate 10 have different polarities, and the movable iron core 7 is It is attracted to the fixed iron core 6 and moves to the contact position. On the other hand, when the energization of the exciting winding 3 is stopped, the movable iron core 7 returns to the initial position by the return spring 13. A part of the return spring 13 is housed in a spring housing recess 24 provided in the fixed iron core 6, and when the movable iron core 7 moves to the contact position, the return spring 13 is compressed and the entire return spring 13 is housed in the spring. The return spring 13 does not prevent the movable iron core 7 from coming into contact with the fixed iron core 6 because it fits in the recess 24.

  In addition, above the electromagnet device 1, a base block 28 formed in a box shape whose lower surface is opened by a heat-resistant material is provided, and terminal holes 29 are provided at two locations on the bottom of the base block 28. Each terminal hole 29 is inserted with a fixed terminal block 30 formed in a cylindrical shape from a copper-based material. A fixed contact 31 is fixed to the lower end surface of each fixed terminal block 30. A casing 32 is provided at the upper end of each fixed terminal block 30 so as to protrude from the entire circumference of the peripheral surface, and the casing 32 is brazed to the base block 28.

  In the base block 28, a flat plate-shaped movable contact 33 made of a conductive material is provided so as to straddle between the two fixed contacts 31, and each portion facing the fixed contact 31 on the upper surface of the movable contact 33 is provided. A movable contact 34 constituting the contact device 2 together with the fixed contact 31 is provided. A shaft hole through which one end of the shaft 19 that connects the movable contact 33 to the movable iron core 7 is inserted is provided at the center of the movable contact 33.

  The shaft 19 is formed in a round bar shape, and is prevented from being detached from the movable contact 33 by a portion protruding upward from the movable contact 33. Further, a contact pressure spring 35 comprising a coil spring through which the shaft 19 is inserted is provided below the movable contact 33, and the movable contact 33 is pressed upward by the spring force of the contact pressure spring 35. It is held at the upper end of the shaft 19. Further, the lower end portion of the shaft 19 is inserted into the fixed iron core 6 and coupled to the movable iron core 7. With this configuration, the movable contact 33 moves in the vertical direction in conjunction with the movement of the movable iron core 7.

  Here, when the movable iron core 7 is in the initial position, the movable contact 34 and the fixed contact 31 are separated from each other (that is, the contact device 2 is opened). On the other hand, when the movable iron core 7 is in the contact position, the movable contact 34. And the fixed contact 31 are in contact (that is, the contact device 2 is closed), and the positional relationship between the movable iron core 7 and the movable contact 33 is set. In short, when the excitation winding 3 is not energized, the contact device 2 is opened to insulate the fixed terminal blocks 30 from each other, and during the period when the excitation winding 3 is energized, the contact device 2. As a result of closing, both the fixed terminal blocks 30 become conductive. The contact pressure between the movable contact 34 and the fixed contact 31 is ensured by the contact pressure spring 35.

  In addition, a cylindrical connecting body 39 that covers the gap between the base block 28 and the yoke upper plate 9 is provided so that the contact device 2, the fixed iron core 6, and the movable iron core 7 are accommodated in the airtight space, and The base block 28, the fixed terminal block 30, the yoke upper plate 9, the guide cylinder 12, and the connecting body 39 are hermetically joined, thereby connecting the base block 28, the fixed terminal block 30, the yoke upper plate 9, and the guide cylinder 12. The space surrounded by the body 39 is an airtight space.

  As shown in FIG. 2, the inner unit A of the present embodiment has a guide cylinder inserted into a coil bobbin in a state where a connecting body, a base block guide cylinder, and the like are attached to the yoke upper board. It is assembled by joining the iron side plates.

  By the way, in this embodiment, the temperature rise of the exciting winding 3 when energizing the exciting winding 3 is suppressed by adopting the configuration described below.

  A heat transfer member 40 is provided between the excitation winding 3 and the yoke side plate 11 as shown in FIG. The heat transfer member 40 conducts heat generated in the excitation winding 3 to the yoke 5, and by this configuration, heat generated in the excitation winding 3 when the excitation winding 3 is energized is transmitted. Heat is radiated from the yoke 5 through the heat member 40. A pair of heat transfer members 40 are provided so as to sandwich the exciting winding 3 from both sides in the left-right direction (the left-right direction in FIG. 1A), and between the yoke side plate 11 and the exciting winding 3. Filling the gap. The contact surface 40 a that contacts the excitation winding 3 in the heat transfer member 40 is formed in a curved surface curved along the outer peripheral surface of the excitation winding 3 as shown in FIG.

  In short, in the electromagnetic switching device of the present embodiment, the excitation winding 3 is provided by dissipating heat generated in the excitation winding 3 from the yoke 5 when the excitation winding 3 is energized by providing the heat transfer member 40. The temperature rise at the time of energization can be suppressed. The upper limit of the ambient temperature range in which the electromagnetic switching device can be used continuously (hereinafter referred to as the operating temperature range) is the ambient temperature of the electromagnetic switching device plus the temperature rise during continuous energization of the excitation winding 3 However, according to the configuration of the present embodiment, the temperature rise during continuous energization of the exciting winding 3 can be kept small, so that the upper limit value of the operating temperature range becomes high. There is an advantage that the operating temperature range is widened.

  The heat transfer member 40 is excited with the yoke side plate 11 along the axial direction of the coil bobbin 4 before joining the yoke upper plate 9 and the yoke side plate 11 as shown in FIG. It is inserted between the windings 3 for use. Therefore, in this embodiment, the heat transfer member 40 is formed from a material having rubber elasticity. Thus, if the dimension of the heat transfer member 40 is set to be slightly larger than the gap between the excitation winding 3 and the yoke side plate 11, the excitation winding 3 and the excitation winding 3 are elastically deformed. By being fitted between the yoke side plate 11, the heat transfer member 40 is sandwiched between the excitation winding 3 and the yoke side plate 11 and is in close contact with both the excitation winding 3 and the yoke side plate 11. As a result, the heat generated in the exciting winding 3 is easily conducted to the yoke 5 via the heat transfer member 40.

  Further, as shown in FIG. 3 (a), the heat transfer member 40 is formed so as to wrap around the front and rear end surfaces of the yoke side plate 11, and not only the surface of the yoke side plate 11 facing the exciting winding 3 is used. The contact area between the heat transfer member 40 and the yoke 5 may be increased by bringing the heat transfer member 40 into contact with the front and rear end faces. When the contact area between the heat transfer member 40 and the yoke 5 is increased in this way, heat is easily conducted from the heat transfer member 40 to the yoke 5, and as a result, the heat dissipation efficiency of the excitation winding 3 is improved. . As shown in FIG. 3B, the yoke side plate 11 may be configured to penetrate the heat transfer member 40.

  Furthermore, as shown in FIG. 4, the heat transfer member 40 has a shape in which each end face in the axial direction (that is, the vertical direction) of the excitation winding 3 is in contact with the yoke upper plate 9 and the yoke lower plate 10. It is good. In this configuration, the contact area between the heat transfer member 40 and the yoke 5 is increased, and not only the heat dissipation efficiency of the excitation winding 3 is improved, but also the heat transfer member 40 in the axial direction of the excitation winding 3 is improved. There is also an effect of restricting movement. That is, even if a vibration or impact is applied to the electromagnetic switching device, the heat transfer member 40 is not displaced. The heat transfer member 40 may be in contact with either the yoke upper plate 9 or the yoke lower plate 10 in addition to the yoke side plate 11.

  On the other hand, as shown in FIG. 5, an arm portion 40 b that extends around the excitation winding 3 and contacts the excitation winding 3 may be provided in the heat transfer member 40. In this configuration, the contact area between the heat transfer member 40 and the excitation winding 3 is expanded by the amount of the arm portion 40b, and heat is easily conducted from the excitation winding 3 to the heat transfer member 40. As a result, the heat dissipation efficiency of the exciting winding 3 is improved. When the arm portion 40b is provided on the heat transfer member 40, as shown in FIG. 6, a reinforcing portion 40c for urging the arm portion 40b toward the excitation winding 3 is provided on the heat transfer member 40, and the excitation winding 3 is provided. It is desirable to prevent the movement of the arm portion 40b away from the arm. Thereby, the arm part 40b and the exciting winding 3 can be brought into close contact with each other, and heat is more easily conducted from the exciting winding 3 to the heat transfer member 40.

  Further, as shown in FIG. 7, the case X of the present embodiment is configured by combining two members of a body 43 and a cover 44 that can be divided in the front-rear direction (vertical direction in FIG. 7). Therefore, the body 43 and the cover 44 are combined by providing pressing portions (not shown) for pressing the arm portion 40b of the heat transfer member 40 against the exciting winding 3 on the inner peripheral surfaces of the body 43 and the cover 44, respectively. At this time, as shown in FIG. 8, the arm portion 40 b pressed in the direction of the arrow P <b> 1 by the pressing portion may be in close contact with the excitation winding 3.

(Embodiment 2)
The electromagnetic switchgear according to the present embodiment is different from the electromagnetic switchgear according to the first embodiment in the configuration of the portion of the heat transfer member 40 that contacts the yoke side plate 11. Other configurations and functions are the same as those of the first embodiment.

  As shown in FIG. 9, the heat transfer member 40 of the present embodiment has a protrusion 41 protruding on the surface facing the yoke side plate 11, and the tip end surface of the protrusion 41 is brought into contact with the yoke side plate 11. ing. Here, a plurality of protrusions 41 are formed along the axial direction (vertical direction) of each coil bobbin. In the configuration in which the protrusion 41 is provided in this way, the protrusion 41 is compressed in the protruding direction when the heat transfer member 40 is fitted between the exciting winding 3 and the yoke side plate 11, thereby the protrusion. There is an advantage that the heat transfer member 40 can be easily fitted between the exciting winding 3 and the yoke side plate 11 as compared with the configuration without 41.

  As shown in FIG. 10, each protrusion 41 may be formed in a shape having a width that increases toward the tip side. In this case, the contact area between the protrusion 41 and the yoke side plate 11 is increased. Can be secured. This makes it easy for the heat of the ridge 41 to escape to the yoke 5, and the temperature gradient between the contact surface 40a that contacts the exciting winding 3 and the ridge 41 in the heat transfer member 40 becomes large. Even though 41 is provided, the heat of the excitation winding 3 is easily conducted to the yoke 5 via the heat transfer member 40, and the heat dissipation efficiency of the excitation winding 3 is improved.

  Each protrusion 41 has a contact portion 41a that contacts the yoke side plate 11, a width dimension smaller than that of the contact portion 41a, supports the contact portion 41a, and the heat transfer member 40 is connected to the excitation winding 3. As shown in FIG. 11 (a), the support portion 41b is compressed in the protruding direction (in the direction of the arrow P2 in FIG. 11 (b)) when fitted between the yoke side plate 11 and the longitudinal direction ( The cross section orthogonal to the (up and down direction) may be configured to be T-shaped. Here, as shown in FIG. 11 (b), the protrusions 42 project from both sides in the width direction of the support portion 41b, and when the support portion 41b is compressed, the protrusions 42 contacting the contact portion 41a as shown in FIG. It is desirable to provide the member 40. According to this configuration, with the heat transfer member 40 fitted between the exciting winding 3 and the yoke side plate 11, the contact portion 41a has the support portion 41b and the protrusion 42 as shown in FIG. Therefore, the heat conducted from the excitation winding 3 to the heat transfer member 40 is conducted to the contact portion 41a through both the support portion 41b and the projection 42, and the projection Compared with the configuration without 42, the cross-sectional area of the path through which heat is conducted between the exciting winding 3 and the yoke 5 can be ensured by the amount of the protrusion 42. Therefore, heat is easily conducted from the excitation winding 3 to the yoke 5, and the heat dissipation efficiency of the excitation winding 3 is improved.

  Furthermore, as shown in FIG. 12A, auxiliary projections 41c may be provided on both side surfaces of the protrusion 41 in the width direction of the support portion 41b. As shown in FIG. 12B, the auxiliary protrusion 41c is set to a size that comes into contact with the protrusion 42 when the support portion 41b is compressed. That is, by providing the auxiliary protrusion 41 c, the heat conducted from the excitation winding 3 to the heat transfer member 40 in a state where the heat transfer member 40 is fitted between the excitation winding 3 and the yoke side plate 11. Is transmitted through the auxiliary protrusion 41c when it is transmitted to the contact portion 41a through the support portion 41b and the protrusion 42. Therefore, compared with the configuration without the auxiliary protrusion 41c, the exciting winding The cross-sectional area of the path through which heat is conducted between the wire 3 and the yoke 5 can be ensured by the amount of the auxiliary protrusion 41c. Therefore, heat is easily conducted from the excitation winding 3 to the yoke 5, and the heat dissipation efficiency of the excitation winding 3 is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of Embodiment 1 of this invention is shown, (a) is a front view, (b) is sectional drawing. It is an exploded perspective view same as the above. It is sectional drawing which shows the other structure same as the above. It is a front view which shows other structure same as the above. It is sectional drawing which shows other structure same as the above. It is sectional drawing which shows other structure same as the above. It is an exploded perspective view same as the above. It is sectional drawing which shows other structure same as the above. It is sectional drawing which shows the structure of Embodiment 2 of this invention. It is sectional drawing which shows the other structure same as the above. Still another configuration is shown, (a) is a cross-sectional view, (b) is a cross-sectional view of the main part, (c) is a state where the heat transfer member is fitted between the exciting winding and the yoke. It is sectional drawing of the principal part. Fig. 4 shows still another configuration of the above, (a) is a cross-sectional view of the main part, (b) is a cross-sectional view of the main part in a state where the heat transfer member is fitted between the exciting winding and the yoke. is there. It is sectional drawing which shows a prior art example. It is a front view which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnet device 2 Contact device 3 Excitation winding 5 Relay 6 Fixed iron core 7 Movable iron core 9 Joint upper plate 10 Joint lower plate 11 Joint side plate 40 Heat transfer member 41 Projection 42 Projection 40b Arm part 40c Reinforcement Part 41a contact part 41b support part 41c auxiliary projection X case

Claims (10)

The exciting coil formed in a cylindrical shape, the fixed iron core arranged inside the exciting coil, and the fixed iron core are arranged inside the exciting coil along the axial direction of the exciting coil. A movable iron core that is attracted to the fixed iron core and moves in the axial direction of the excitation winding in response to the energization of the excitation winding, and the excitation winding so as to surround the excitation winding. An electromagnet device having a yoke arranged together with a fixed iron core and a movable iron core, and a contact point that opens and closes in conjunction with the movement of the movable iron core. A heat transfer member that conducts heat generated in the excitation winding to the yoke when the excitation winding is energized between the outer peripheral surface of the excitation winding and the yoke. provided, the heat transfer member, an electromagnetic open, characterized by being sandwiched between the excitation winding and the yoke made of a material having rubber elasticity Apparatus. The heat transfer member is provided with a protrusion protruding from the surface facing the yoke, the tip surface of which is in contact with the yoke, and is fitted between the exciting winding and the yoke, 2. The electromagnetic switch according to claim 1, wherein the heat transfer member is compressed in the protruding direction when fitted between the yoke and the exciting winding . The electromagnetic switch according to claim 2 , wherein the protrusion is formed such that a width dimension is larger toward a tip end side . The protrusion has a contact portion that contacts the yoke, and a support portion that is formed smaller in width than the contact portion and supports the contact portion, and the heat transfer member is on the width direction side of the support portion. The electromagnetic switching device according to claim 2, further comprising a protrusion protruding from the side and contacting the contact portion when the support portion is compressed . 5. The electromagnetic switching device according to claim 4 , wherein the protrusion protrudes from both side surfaces in the width direction of the support portion, and an auxiliary protrusion that contacts the protrusion when the support portion is compressed is formed . The yoke has a yoke side plate that disposes the heat transfer member between a part of the outer peripheral surface of the excitation winding, and the heat transfer member is in contact with two or more surfaces of the yoke side plate. electromagnetic switching device according be formed in any one of claims 1 to 5, characterized in the. The heat transfer member has an arm portion that extends so as to surround the excitation winding in a plane orthogonal to the axial direction of the excitation winding and contacts the excitation winding. The electromagnetic switch according to any one of claims 1 to 6. The electromagnetic switching device according to claim 7 , wherein the heat transfer member has a reinforcing portion that presses the arm portion against the exciting winding . The electromagnetic device is housed in a box-shaped case, said case is claim 1, characterized in that it comprises a pressing portion for pressing a portion of the heat transfer member to the exciting winding on the inner peripheral surface The electromagnetic switchgear according to any one of claims 8 to 9 . The yoke includes a yoke upper plate and a yoke lower plate arranged on both sides in the axial direction of the excitation winding, and a yoke side plate that connects edges of the yoke upper plate and the yoke lower plate. The heat transfer member is disposed between the exciting winding and the yoke side plate, and is in contact with at least one of the yoke upper plate and the yoke lower plate. electromagnetic switching equipment according to any one of claims 1 to 9.

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