WO2010052750A1 - 三相電動機の保護装置 - Google Patents
三相電動機の保護装置 Download PDFInfo
- Publication number
- WO2010052750A1 WO2010052750A1 PCT/JP2008/003177 JP2008003177W WO2010052750A1 WO 2010052750 A1 WO2010052750 A1 WO 2010052750A1 JP 2008003177 W JP2008003177 W JP 2008003177W WO 2010052750 A1 WO2010052750 A1 WO 2010052750A1
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- WO
- WIPO (PCT)
- Prior art keywords
- phase motor
- fixed
- plate
- housing
- protection device
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
- H01H2037/5463—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element forming part of switched circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
- H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
- H01H37/5436—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing mounted on controlled apparatus
Definitions
- the present invention relates to a protection device for a three-phase motor, which has a contact opening / closing mechanism using a thermally responsive plate made of bimetal or the like in a sealed container, and is used for cutting off an alternating current flowing in the three-phase motor.
- the protection device for a three-phase motor described in Prior Art Document 1 includes a thermally responsive plate made of bimetal inside a sealed container made of a metal housing and a metal plate. Three conductive terminal pins are airtightly fixed to the metal plate constituting the sealed container. Fixed contacts are respectively fixed to the end portions of the three conductive terminal pins protruding into the sealed container. On the other hand, movable contacts are respectively fixed to portions of the thermally responsive plate that face the three fixed contacts. These three movable contacts constitute three pairs of switching contacts together with the three fixed contacts. Further, as described in, for example, Japanese Published Patent Publication No.
- the above-described thermal reaction plate has a through hole provided in the center portion thereof, and is caulked. It is provided in an airtight container in a state of being fixed to a support (bolt or the like) by screwing or the like.
- Such a protection device for a three-phase motor is mounted in, for example, a hermetic housing of a hermetic electric compressor and used as a thermal protector for a three-phase motor for driving a compressor.
- the three conductive terminal pins are respectively connected to the neutral point side terminals of the windings of the respective phases of the three-phase motor.
- the strain at the time of reversal of the thermally responsive plate is concentrated in the central portion.
- the strain at the time of reversal of the thermally responsive plate is concentrated around the through hole, and the crack starting from the through hole is generated. There was a problem. Further, in the thermally responsive plate drawn into a dish shape, the most deformed portion at the time of reversing and returning is the central portion of the thermally responsive plate.
- An object of the present invention is to provide a protection device for a three-phase motor that can be provided while maintaining the reversal characteristics that originally had a thermally responsive plate, and that can accurately interrupt an alternating current flowing through the three-phase motor. There is.
- the protection device for a three-phase motor includes a sealed container composed of a metal housing and a metal plate that is airtightly fixed to an opening end thereof, a protrusion provided inside the housing, and the metal plate.
- Three conductive terminal pins respectively inserted into three through holes provided in the airtightly and fixed hermetically by an electrically insulating filler, and fixed to the end portions of the three conductive terminal pins protruding into the sealed container.
- Three fixed contacts a thermally responsive plate that is drawn in a dish shape and reverses its bending direction at a predetermined temperature, and is fixed to a portion of the thermally responsive plate that faces the three fixed contacts.
- Three movable contacts that form three pairs of switching contacts together with one fixed contact, and a central portion of the thermal reaction plate are sandwiched between the protrusions, and the thermal response plate is urged away from the fixed contact.
- Elasticity And an anti-rotation member that maintains the three movable contacts facing the three fixed contacts by preventing the thermal responsive plate from rotating about the central portion of the thermal responsive plate.
- the three conductive terminal pins are used in a state where they are respectively connected to the neutral point side terminals of the windings of the respective phases of the three-phase motor, and are configured to cut off the alternating current flowing through the three-phase motor. It is characterized by being.
- the elastic member may be fixed via a support fixed to the housing.
- the rotation preventing member may be configured by a portion connecting the housing and the elastic member in the support.
- the center of the thermally responsive plate is sandwiched between the protrusion provided in the housing and the elastic member.
- the through-hole conventionally provided in order to fix a thermally responsive board can be made unnecessary. Therefore, it is possible to provide the thermally responsive plate while maintaining the reversal characteristics that were originally provided, and it is possible to accurately interrupt the alternating current flowing through the three-phase motor.
- FIG. 1 is a longitudinal side view showing a configuration of a protection device for a three-phase motor according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal side view showing the configuration of the metal plate assembly and the housing assembly.
- FIG. 3 is an exploded perspective view of the protection device for the three-phase motor.
- FIG. 4 is a cross-sectional plan view of the protection device for the three-phase motor.
- FIG. 5 is a perspective view showing a state in which the spring support, the thermally responsive plate, the movable contact, and the spring member are assembled.
- FIG. 6 is an enlarged vertical side view of the periphery of the central portion of the thermally responsive plate.
- FIG. 7 is a longitudinal side view showing an example of a hermetic electric compressor.
- FIG. 1 is a longitudinal side view showing a configuration of a protection device for a three-phase motor according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal side view showing the configuration of the metal plate
- FIG. 8 is an enlarged vertical side view showing a cluster socket mounting portion.
- FIG. 9 is a diagram illustrating a connection state between the three-phase motor and the protection device.
- FIG. 10A is a perspective view showing the upper side of the cluster socket.
- FIG. 10B is a perspective view showing the lower side of the cluster socket.
- FIG. 11 is a view corresponding to FIG. 1 according to the second embodiment of the present invention.
- FIG. 12 corresponds to FIG.
- FIG. 13 is a view corresponding to FIG. 1 according to the third embodiment of the present invention.
- FIG. 14 corresponds to FIG.
- FIG. 15A is a plan view of the holder.
- FIG. 15B is a vertical side view of the holder.
- FIG. 16 is a view corresponding to FIG. 1 according to a modification of the present invention.
- FIG. 17 is a view corresponding to FIG. 1 according to a modification of the present invention.
- 1 is a protection device for a three-phase motor
- 5 is a three-phase motor
- 5A, 5B, and 5C are terminals on the neutral point side of the winding of each phase of the three-phase motor
- 21 is a sealed container
- 22 and 41 are housings
- 23A is a through hole
- 26 is a conductive terminal pin
- 27 is a fixed contact
- 28 is a filler
- 29 is a solder pellet (a member made of solder)
- 31 is a spring support (support)
- 31B is a connecting portion (Anti-rotation member, a portion connecting the housing and the elastic member in the support)
- 32, 43 and 52 are thermally responsive plates
- 33 is a movable contact
- 34 is a spring member (elastic member)
- 35 and 41A are protrusions
- Reference numeral 42 denotes a coil spring (elastic member)
- 43B denotes an extension (rotation preventing member)
- FIG. 7 is a longitudinal sectional side view showing an example of a vertically installed rotary hermetic electric compressor 2 provided with the protection device 1 for a three-phase motor according to the present invention.
- the hermetic electric compressor 2 is of a so-called high pressure housing type in which the entire metal compressor housing 3 is a discharge refrigerant passage after compression.
- the compressor housing 3 is composed of three parts: a central part 3A whose upper and lower ends are open, a housing end 3B that hermetically covers the lower end side of the central part 3A, and a housing end 3C that hermetically covers the upper end side of the central part 3A. Has been.
- a rotary compressor 4 and a three-phase motor 5 are accommodated.
- the rotary compressor 4 is disposed on the housing end 3B side in the central portion 3A of the compressor housing 3.
- the rotary compressor 4 includes a housing (not shown) and a rotor (not shown).
- the rotor is driven by a three-phase motor 5 via a crank (not shown) and a drive shaft (not shown).
- the three-phase motor 5 is disposed on the housing end 3 ⁇ / b> C side in the central portion 3 ⁇ / b> A of the compressor housing 3.
- a suction pipe 6 is provided on the side of the compressor housing 3, and a discharge pipe 7 is provided on the top of the compressor housing 3.
- the suction pipe 6 penetrates the side of the compressor housing 3 and is fixed in an airtight manner, and is connected to the rotary compressor 4 to supply suction refrigerant into the rotary compressor 4.
- the discharge pipe 7 passes through the upper end portion of the compressor housing 3 and is hermetically fixed.
- the refrigerant compressed by the rotary compressor 4 passes through the compressor housing 3 and is supplied from the discharge pipe 7 to a refrigeration unit (not shown). Note that lubricating oil is injected into the compressor housing 3.
- a through hole 3D is provided in the compressor housing 3 (in this case, a portion constituted by the housing end 3C), and the inside and outside of the compressor housing 3 are electrically connected to the through hole 3D.
- the airtight conductive terminal 10 is fixed in an airtight manner.
- the hermetic conductive terminal 10 has a structure in which a plurality (three in this case) of conductive terminal pins 11 are penetrated through a metal body.
- These conductive terminal pins 11 are hermetically insulated and fixed by a well-known compression type hermetic seal with an electrically insulating filler (not shown) made of glass or the like in consideration of the thermal expansion coefficient.
- One end of the conductive terminal pin 11 (end on the outside of the compressor housing 3) is connected to the power source 12 (see FIG. 9), and the other end of the conductive terminal pin 11 (on the inner side of the compressor housing 3). Ends) are respectively inserted into the sockets 13.
- the socket 13 is connected to the three-phase motor 5 through three lead wires 14.
- a cluster socket 16 is fixed inside the compressor housing 3 via a fixing bracket 15. As shown in FIG. 8, the cluster socket 16 is arranged in a state where the cluster socket 16 is fitted in the support piece portions 15 ⁇ / b> A and 15 ⁇ / b> B provided in the fixing bracket 15.
- the cluster socket 16 is provided with three insertion openings 16A (see FIG. 10A) opened in a rectangular shape along the longitudinal direction of the cluster socket 16.
- three insertion ports 16B (see FIG. 10B) opened in a circular shape are provided. This insertion port 16B is provided according to the standard, and in this case, it is positioned so as to form a triangle with each side being equally spaced.
- Three lead wires 17 (see FIG. 7) extending from the three-phase motor 5 are inserted and fixed in the insertion port 16A of the cluster socket 16, respectively. These lead wires 17 are connected to terminals 5A to 5C (see FIG. 9) on the neutral point side of the winding of each phase of the three-phase motor 5.
- Three conductive terminal pins 26 of the protection device 1 to be described later can be inserted into the insertion port 16B of the cluster socket 16 respectively.
- FIG. 1 is a longitudinal side view showing the configuration of the protection device 1.
- the sealed container 21 of the protection device 1 is hermetically fixed to a metal housing 22 made by drawing an iron plate or the like by pressing and ring opening welding or the like at the opening end thereof. And a metal plate 23.
- the protective device 1 has a contact opening / closing mechanism using a thermally responsive plate 32 inside the sealed container 21, and is used for applications that block AC current flowing through the three-phase motor 5.
- the protection device 1 includes a metal plate assembly 24 and a housing assembly 25.
- the metal plate assembly 24 includes a metal plate 23, three conductive terminal pins 26 (only two are shown in FIG. 2), and three fixed contacts 27 (only two are shown in FIG. 2). ing.
- the metal plate 23 is formed thicker than the housing 22 as a whole, and its outer peripheral portion has a smooth triangular shape as shown in FIG.
- the metal plate 23 is provided with three through holes 23A. These through-holes 23A are positioned so as to form a triangle with each side being equally spaced.
- the three conductive terminal pins 26 are inserted into the three through holes 23A of the metal plate 23, respectively, and are electrically sealed by a well-known compression type hermetic seal by an electrically insulating filler 28 made of glass or the like considering the thermal expansion coefficient. Insulated and fixed.
- the three fixed contacts 27 are fixed to the ends of the three conductive terminal pins 26 protruding into the sealed container 21 by welding. These three fixed contacts 27 are contacts containing metal oxide, the shape thereof is a disk shape, and the contact surface has a slightly convex curved surface (spherical surface).
- the housing assembly 25 includes a housing 22, a solder pellet 29, a protective plate 30, a spring support 31, a heat responsive plate 32, three movable contacts 33 (only two are shown in FIG. 2), a spring.
- the member 34 is comprised.
- the housing 22 has a smooth triangular shape whose outer edge is slightly smaller than the outer peripheral portion of the metal plate 23.
- 3 of the metal plate assembly 24 is placed in the space surrounded by the side wall portion 22B of the housing 22.
- One conductive terminal pin 26 and three fixed contacts 27 are accommodated.
- a circular recess 22 ⁇ / b> A (see FIG. 3) that opens downward is provided in the center of the housing 22.
- the solder pellet 29 is a member formed by punching a material made of plate-like solder (in this case, not containing lead), and has a flat ring shape having an insertion hole 29A (see FIG. 3) in the center thereof. There is no. A protrusion 30A (see FIG. 3) of a protection plate 30 to be described later can be inserted into the insertion hole 29A of the solder pellet 29.
- the melting temperature of the solder pellets 29 is equal to or higher than the reversal temperature (in this case, 100 ° C.) of the thermoresponsive plate 32 described later and is as low as possible (eg, 220 ° C. to 250 ° C.).
- the protective plate 30 is made by drawing a copper plate or the like by pressing, and has a bottomed circular cylindrical projection 30A and around the opening end of the projection 30A. And a flange portion 30B provided in an annular shape.
- the spring support 31 includes a fixed portion 31A and three connecting portions 31B extending downward from the outer edge portion of the fixed portion 31A.
- the fixed portion 31A has a disk shape having a circular opening 31C at the center.
- the three connecting portions 31B are arranged at equal intervals along the circumferential direction of the fixed portion 31A at the outer edge portion of the fixed portion 31A.
- the connecting portions 31B have a shape in which a tip end is curved upward, and an engaged portion 31D cut out in a rectangular shape is formed at the tip.
- the thermally responsive plate 32 is made of a member (bimetal, trimetal or the like) that is deformed by heat, and is formed in a substantially disk shape as a whole.
- the thermally responsive plate 32 is drawn into a shallow dish shape, and when it reaches a predetermined reversal temperature (in this case, 100 ° C.), its curving direction suddenly reverses. Further, when the thermally responsive plate 32 is lowered to a predetermined reversal temperature or lower, its bending direction is restored.
- the outer edge portion of the heat responsive plate 32 is formed with three extending portions 32A having equal intervals along the circumferential direction of the heat responsive plate 32 and extending outward. Further, in the outer edge portion of the heat responsive plate 32, there are three portions extending between the three extending portions 32A at equal intervals along the circumferential direction of the heat responsive plate 32 and extending outward. A protruding piece 32B is formed. These projecting piece portions 32B are respectively formed in the central portion between the extending portions 32A. In addition, a cutout portion 32C that is cut out in a rectangular shape is formed at the center of each of the projecting piece portions 32B.
- the movable contact 33 is fixed to the lower surface of the three extending portions 32A of the thermally responsive plate 32 (the portion facing the three fixed contacts 27 in the sealed container 21 of the protective device 1) by welding.
- These three movable contacts 33 are contacts containing metal oxide, the shape thereof is a disk shape, and the contact surface has a slightly convex curved surface (spherical surface).
- the spring member 34 has a support portion 34A and three leaf spring portions 34B extending from the outer edge portion of the support portion 34A.
- the central portion of the support portion 34A has a protrusion 34C that protrudes upward in a ring shape.
- the three leaf spring portions 34B are formed and arranged at equal intervals on the outer edge portion of the support portion 34A.
- Each of the leaf springs 34B has a shape in which a tip end is curved upward, and an engagement portion 34D bent inward is provided at the tip end.
- the housing assembly 25 composed of such members is assembled as follows. First, the upper surface of the fixing portion 31A of the spring support 31 is fixed to the lower surface inside the housing 22 by welding. At this time, the spring support 31 is placed inside the housing 22 and welded so that the recess 22A of the housing 22 is positioned at the center of the opening 31C of the fixing portion 31A. Next, the solder pellet 29 is inserted into the recess 22 ⁇ / b> A of the housing 22, and the protective plate 30 is disposed on the lower surface of the inserted solder pellet 29. At this time, the protrusion 30 ⁇ / b> A of the protection plate 30 is inserted into the insertion hole 29 ⁇ / b> A of the solder pellet 29. Thereby, the protrusion part 35 (refer FIG. 1) which consists of the solder pellet 29 and the protection board 30 is formed.
- the thermally responsive plate 32 is disposed on the lower surface of the protective plate 30 (projection 35) with the top of the curved portion on the upper side (projection 35 side). At this time, the center of the upper surface of the thermally responsive plate 32 is brought into contact with the lower surface of the protection plate 30.
- the three movable contacts 33 fixed to the three extending portions 32A of the thermally responsive plate 32 are respectively positioned at the center between the three connecting portions 31B of the spring support 31 (see FIG. 5). Further, the three connecting portions 31B of the spring support 31 are fitted into the three cutout portions 32C of the thermally responsive plate 32 (see FIG. 5).
- the spring member 34 is arranged at the lower part of the heat responsive plate 32, and the protrusion 34 ⁇ / b> C at the center of the spring member 34 is brought into contact with the center of the lower surface of the heat responsive plate 32. Then, the three engaging portions 34D of the spring member 34 are engaged with the three engaged portions 31D of the spring support 31 (see FIG. 5).
- the housing assembly 25 is assembled in which the central portion of the thermally responsive plate 32 is integrated with the housing 22 in a state where the central portion is sandwiched between the protruding portion 35 and the spring member 34.
- the portion fixed by welding is only the contact portion between the housing 22 and the spring support 31.
- the protection plate 30 and the thermal reaction plate 32, and between the thermal reaction plate 32 and the spring member 34 Is in a state where each member is in contact but not fixed.
- the protection device 1 is assembled by air-tightly welding the metal plate 23 of the metal plate assembly 24 configured as described above and the open end of the housing 22 of the housing assembly 25 while enclosing a gas of a predetermined pressure.
- the thermally responsive plate 32 is urged by the spring member 34 in a direction away from the fixed contact 27. Further, as shown in FIG. 6, the central portion of the thermally responsive plate 32 has a lower surface pressed by the upper end portion of the protrusion 34 ⁇ / b> C of the spring member 34, and an upper surface pressed by the flange portion 30 ⁇ / b> B of the protection plate 30. It becomes. That is, the upper surface and the lower surface of the central portion of the thermally responsive plate 32 are both pressed by the ring-shaped portions (the projecting portion 34C and the flange portion 30B).
- the thermally responsive plate 32 when the thermally responsive plate 32 is reversed, the central portion of the thermally responsive plate 32 surrounded by the protrusion 34C and the flange portion 30B is regulated in the internal space C of the protrusion 34C and the internal space D of the flange portion 30B. It can move without Therefore, it is possible to reduce the influence of the fixed portion on the operation of the thermal reaction plate 32 and to make use of the reversal characteristics that the thermal reaction plate 32 originally has as a thermal protector.
- the three connecting portions 31B that connect the housing 22 and the spring member 34 in the spring support 31 are respectively fitted in the three cutout portions 32C of the thermally responsive plate 32 and are sandwiched between the projecting piece portions 32B. It is in the state. Therefore, the heat responsive plate 32 is prevented from rotating around the central portion of the heat responsive plate 32 (the portion sandwiched between the protrusion 35 and the protrusion 34C of the spring member 34). Further, the thermally responsive plate 32 is in a state in which three portions (notch portions 32C) having equal intervals at the outer edge portion are pressed by the connecting portion 31B. Therefore, the heat responsive plate 32 is prevented from moving in the horizontal direction. In this manner, the thermally responsive plate 32 is prevented from rotating in the circumferential direction and moving in the horizontal direction. As a result, the state in which the three movable contacts 33 face the three fixed contacts 27 in the vertical direction and the three pairs of switching contacts 27 and 33 are formed inside the sealed container 21 of the protection device 1 is maintained. ing.
- solder pellet 29 is in a state where the upper part is inserted into the recess 22A of the housing 22 and the protrusion 30A of the protective plate 30 is inserted into the lower part (insertion hole 29A). As a result, the vertical and horizontal positions of the solder pellets 29 can be determined.
- the protection device 1 configured as described above is attached to the hermetic electric compressor 2 by inserting the three conductive terminal pins 26 into the three insertion ports 16B of the cluster socket 16. These conductive terminal pins 26 are connected to the lead wires 17 inside the cluster socket 16. As a result, as shown in FIG. 9, the three conductive terminal pins 26 of the protection device 1 are connected to the neutral point side terminals 5A to 5C of the windings of the respective phases of the three-phase motor 5 through the lead wires 17, respectively. It will be in the state. That is, the protection device 1 is arranged at the neutral point of the star connection (Y connection) of the three-phase motor 5 and functions as the neutral point of the three-phase motor 5.
- the internal temperature of the protection device 1 is changed to the reversal temperature of the thermal reaction plate 32. Is exceeded, the thermally responsive plate 32 is reversed and the switching contacts 27 and 33 are opened, and the power supply to the three-phase motor 5 is interrupted. Further, when the temperature of the refrigerant or the current value of the three-phase motor 5 falls below a predetermined value and the internal temperature of the protection device 1 falls below the reversal temperature of the thermal reaction plate 32, the thermal reaction plate 32 returns. The switching contacts 27 and 33 are closed again, and the three-phase motor 5 is energized.
- the thermal reaction plate 32 does not reach the reversal temperature due to the operating current of the three-phase motor 5.
- the heat responsive plate 32 is reversed in a short time by the heat generated from the heat responsive plate 32 constituting a part of the electric circuit, and the switching contacts 27 and 33 are opened. To do.
- the heat generated in the heat responsive plate 32 is radiated to the housing 22 through the protrusions 35 that are in direct contact with the heat responsive plate 32. Therefore, the heat responsive plate 32 does not generate heat abnormally.
- the protective device 1 when the protective device 1 repeatedly opens and closes the switching contacts 27 and 33 over a long period of time and exceeds the guaranteed number of operations, the fixed contact 27 and the movable contact 33 may be welded and cannot be separated.
- the rotor (not shown) of the three-phase motor 5 when the rotor (not shown) of the three-phase motor 5 is constrained, the temperature of the thermally responsive plate 32 (particularly the temperature at the center) rises due to an excessive current, and the heat passes through the protective plate 30.
- the solder pellets 29 To the solder pellets 29. In this case, a part of the heat transmitted to the solder pellet 29 is radiated to the housing 22 as described above.
- the switching contacts 27 and 33 are welded, the heat responsive plate 32 continuously generates heat.
- the protection device 1 When the heat responsive plate 32 generates heat abnormally, the solder pellets 29 reach the melting temperature and melt due to the heat, and the protection device 1 is in a state in which the protruding portion 35 sandwiching the heat responsive plate 32 is lost. In this state, since the thermally responsive plate 32 is further urged away from the fixed contact 27 by the spring member 34, the welded switching contacts 27 and 33 are opened almost simultaneously. Therefore, it is possible to reliably cut off the power supply to the three-phase motor 5.
- the thermally responsive plate 32 has a central portion between the protrusion 35 provided in the housing 22 and the spring member 34. It is pinched. Thereby, the through-hole conventionally provided in order to fix a thermally responsive board can be made unnecessary. Therefore, it is possible to provide the thermally responsive plate 32 while maintaining the reversal characteristics that it originally had, and it is possible to accurately interrupt the alternating current flowing through the three-phase motor 5. Further, since the protection device 1 for a three-phase motor does not have a through hole in the thermal reaction plate 32, there is no risk of cracks or the like around the through hole, and the reversal that the thermal reaction plate 32 originally has is reversed. The characteristics are not impaired.
- a part of the protrusion 35 that sandwiches the thermally responsive plate 32 is formed by a solder pellet 29 (a member made of solder).
- a solder pellet 29 a member made of solder
- a spring member 34 that sandwiches the thermally responsive plate 32 is fixed via a spring support 31 fixed to the housing 22. According to such a configuration, the thermally responsive plate 32 can be integrated with the housing 22 while being sandwiched between the protrusion 35 and the spring member 34. Therefore, the protection device 1 for the three-phase motor can be easily manufactured.
- the heat responsive plate 32 is a central portion of the heat responsive plate 32 using a portion (connecting portion 31B) that connects the housing 22 and the spring member 34 in the spring support 31. Is configured to prevent rotation about the center. Therefore, it is not necessary to provide a new member as a member for preventing such rotation. Thereby, the protection apparatus 1 of a three-phase motor can be manufactured without increasing the number of parts.
- a part of the thermally responsive plate 43 is brought into contact with the inner peripheral surface 41 ⁇ / b> C of the housing 41 to prevent the thermal responsive plate 43 from rotating in the circumferential direction.
- a protrusion 41 ⁇ / b> A formed by drawing by a press is provided at the center of the housing 41.
- a coil spring 42 is supported at the center of the metal plate 23. The coil spring 42 sandwiches the center of the heat responsive plate 43 between the protrusion 41A and fixes the heat responsive plate 43 to a fixed contact. The urging is performed in a direction away from 27.
- three extension portions 43 ⁇ / b> B extending outward in a rectangular shape are respectively formed in the central portion between the three extension portions 43 ⁇ / b> A to which the movable contact 33 is fixed at the outer edge portion of the thermally responsive plate 43.
- the tip portions of these three extension portions 43B are opposed to the inner peripheral surface 41C of the housing 41 with a slight gap (not shown).
- the extension 43 ⁇ / b> B contacts the inner peripheral surface 41 ⁇ / b> C of the housing 41, so that the heat responsive plate 43 rotates around the center of the heat responsive plate 43, and the heat responsive The plate 43 is prevented from moving in the horizontal direction.
- extension portion 43B has a slight gap with the inner peripheral surface 41C of the housing 41. Therefore, the extension 43B is not caught by the inner peripheral surface 41C of the housing 41 when the thermal reaction plate 43 is reversed and returned, and does not affect the reversal characteristics of the thermal reaction plate 43.
- an extension portion 43 ⁇ / b> B that functions to prevent rotation of the thermal reaction plate 43 is provided in a part of the thermal reaction plate 43. Therefore, it is not necessary to provide a new member as a member for preventing rotation. Moreover, it is not necessary to use a part of existing members (for example, the connecting portion 31B of the spring member 34 shown in the first embodiment described above) as a member for preventing rotation. Thereby, the protection device for the three-phase motor can be manufactured while further suppressing the increase in the number of parts.
- a holder 51 for preventing the rotation of the thermally responsive plate 52 is provided as an independent member dedicated to preventing rotation.
- the holder 51 includes a protruding portion 51A and three fixing portions 51B extending outward from the protruding portion 51A.
- the protruding portion 51A extends upward in a cylindrical shape and holds the coil spring 42 (see FIG. 13).
- the three fixing portions 51B are equally spaced in the circumferential direction around the projection 51A, and a holding portion 51C extending upward in a plate shape is provided at the outer end portion thereof.
- Protruding portions 51D that protrude upward in a rectangular shape are provided at the upper ends of the holding portions 51C.
- the fixing portion 51B of the holder 51 is fixed to the upper surface of the metal plate 23 as shown in FIG. Thereby, the protrusion 51 ⁇ / b> A of the holder 51 is arranged at the center of the upper surface of the metal plate 23.
- the coil spring 42 is held by the protrusion 51 ⁇ / b> A of the holder 51.
- the three protrusions 51 ⁇ / b> D of the holder 51 are respectively fitted into the three notches 52 ⁇ / b> C of the thermally responsive plate 52 and are sandwiched between the protrusions 52 ⁇ / b> B. This prevents the thermal reaction plate 52 from rotating around the central portion of the thermal reaction plate 52 and the thermal reaction plate 52 from moving in the horizontal direction.
- the elastic member is not limited to the spring member 34 fixed via the spring support 31 fixed to the housing 22.
- a coil spring 42 is held at the center of the metal plate 23, and the coil spring 42 sandwiches the center of the thermally responsive plate 32 between the protrusions 35. 32 may be urged away from the fixed contact 27.
- the protrusion 35 is not limited to the one made of the solder pellet 29 and the protective plate 30, and for example, as shown in FIG. 17, the central portion of the housing 41 is pressed.
- the protrusion 41A may be provided by drawing.
- the spring member 34 and the coil spring 42 are not limited to those having an urging force that opens the three pairs of welded contacts 27 and 33 at substantially the same time. Of the three pairs of welded contacts 27 and 33 that are welded, What is necessary is just to have the urging
- the protection device for a three-phase motor according to the present invention may be used not only for a vertical hermetic electric compressor 2 but also for a horizontal hermetic electric compressor.
- the protection device for a three-phase motor according to the present invention is a so-called low-pressure housing type hermetically sealed type in which a three-phase motor 5 is disposed in a low-pressure portion on the suction side and a rotary compressor 4 is disposed in a high-pressure portion on the discharge side.
- the compressor type is not limited to the rotary compressor, and other types such as a scroll compressor can be used.
- the conventionally provided through hole for fixing the thermally responsive plate can be made unnecessary, and the reversal characteristics originally possessed by the thermally responsive plate are maintained.
- it can be prepared. Therefore, it is useful, for example, as a thermal protector for a three-phase motor for a hermetic electric compressor.
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- Physics & Mathematics (AREA)
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Abstract
Description
従って、従来の構成では、熱応動板が当初有していた反転特性を維持することができず、三相電動機に流れる交流電流を精度良く遮断できないおそれがある。
さらに、前記弾性部材を、前記ハウジングに固着された支持体を介して固定するとよい。
さらに、前記回転防止部材を、前記支持体において前記ハウジングと前記弾性部材とを連結する部分で構成するとよい。
本発明の第1の実施形態について図1ないし図10を参照しながら説明する。図7は、本発明の三相電動機の保護装置1を備えた縦置きのロータリー式密閉型電動圧縮機2の一例を示す縦断側面図である。この密閉型電動圧縮機2は、金属製の圧縮機ハウジング3全体が圧縮後の吐出冷媒通路とされる所謂高圧ハウジングタイプのものである。圧縮機ハウジング3は、上下両端が開放した中央部3Aと、中央部3Aの下端側を気密に覆うハウジングエンド3Bと、中央部3Aの上端側を気密に覆うハウジングエンド3Cの3つの部分から構成されている。
図1に示すように、保護装置1の密閉容器21は、鉄板等をプレスによって絞り成形して作られた金属製のハウジング22と、その開口端にリングプロジェクション溶接等を用いて気密に固着された金属板23とから構成されている。保護装置1は、この密閉容器21内部に、熱応動板32を用いた接点開閉機構を有しており、三相電動機5に流れる交流電流を遮断する用途に用いられる。
このうち金属板アセンブリ24は、金属板23と、3つの導電端子ピン26(図2では2つのみ示す)と、3つの固定接点27(図2では2つのみ示す)とを備えて構成されている。金属板23は、全体として上記ハウジング22よりも肉厚に形成されており、図3に示すように、その外周部が滑らかな三角形状をなしている。この金属板23には、3つの貫通孔23Aが設けられている。これら貫通孔23Aは、各辺が等間隔となる三角形を形成するように位置している。
まず、ばね支持体31の固定部31Aの上面を、ハウジング22内部の下面に溶接によって固着する。このとき、固定部31Aの開口部31Cの中央部にハウジング22のくぼみ22Aが位置するように、ばね支持体31をハウジング22内部に配置して溶接する。次に、ハンダペレット29をハウジング22のくぼみ22A内部に挿入し、挿入したハンダペレット29の下面に保護板30を配置する。このとき、保護板30の突起部30Aを、ハンダペレット29の挿入孔29Aに挿入する。これにより、ハンダペレット29と保護板30とからなる突起部35(図1参照)が形成される。
また、三相電動機の保護装置1は、熱応動板32に貫通孔を有していないことから、貫通孔の周囲に亀裂等が生じるおそれがなく、熱応動板32が当初有している反転特性が損なわれることがない。
次に、本発明の第2の実施形態について図11及び図12を参照しながら説明する。本実施形態は、ハウジング41の内周面41Cに熱応動板43の一部を当接させることによって、当該熱応動板43の周方向への回転を防止するように構成したものである。
図11に示すように、ハウジング41の中央部には、プレスによって絞り成形された突起部41Aが設けられている。また、金属板23の中央部にはコイルばね42が支持されており、このコイルばね42は、熱応動板43の中央部を突起部41Aとの間に挟持し当該熱応動板43を固定接点27から離れる方向に付勢するようになっている。
次に、本発明の第3の実施形態について図13ないし図15A,Bを参照しながら説明する。図13及び図14に示すように、本実施形態は、熱応動板52の回転を防止するためのホルダ51を、回転防止専用の独立した部材として設けたものである。
尚、本発明は、上述した各実施形態に限られるものではなく、例えば次のような変形が可能である。
上述の第1の実施形態において、弾性部材は、ハウジング22に固着されたばね支持体31を介して固定されたばね部材34に限られるものではない。例えば、図16に示すように、金属板23の中央部にコイルばね42を保持し、このコイルばね42によって、熱応動板32の中央部を突起部35との間に挟持し当該熱応動板32を固定接点27から離れる方向に付勢するようにしてもよい。
ばね部材34やコイルばね42は、溶着した3対の開閉接点27,33をほぼ同時に開放するほどの付勢力を有するものに限られるものではなく、溶着した3対の開閉接点27,33のうち少なくとも2つを開放できる程度の付勢力を有していればよい。
また、本発明の三相電動機の保護装置は、例えば船舶に用いられる発動機用の保護装置として用いてもよい。
Claims (4)
- 金属製のハウジング(22,41)とその開口端に気密に固着された金属板(23)とから構成される密閉容器(21)と、
前記ハウジング(22,41)内部に設けられた突起部(35,41A)と、
前記金属板(23)に設けられた3つの貫通孔(23A)にそれぞれ挿通され電気絶縁性の充填材(28)によって気密に固定された3つの導電端子ピン(26)と、
前記3つの導電端子ピン(26)の前記密閉容器(21)内に突出する端部にそれぞれ固着された3つの固定接点(27)と、
皿状に絞り成形されて所定の温度でその湾曲方向が反転する熱応動板(32,43,52)と、
前記熱応動板(32,43,52)において前記3つの固定接点(27)に対向する部分にそれぞれ固着され、前記3つの固定接点(27)と共に3対の開閉接点を構成する3つの可動接点(33)と、
前記熱応動板(32,43,52)の中央部を前記突起部(35,41A)との間に挟持し当該熱応動板(32,43,52)を前記固定接点(27)から離れる方向に付勢する弾性部材(34,42)と、
前記熱応動板(32,43,52)が当該熱応動板(32,43,52)の中央部を中心に回転することを防止することによって前記3つの可動接点(33)が前記3つの固定接点(27)に対向した状態を維持する回転防止部材(31B,43B,51)とを備え、
前記3つの導電端子ピン(26)が三相電動機(5)の各相の巻線の中性点側の端子(5A,5B,5C)にそれぞれ接続された状態で用いられ、当該三相電動機(5)に流れる交流電流を遮断するように構成されていることを特徴とする三相電動機の保護装置。 - 請求の範囲第1項に記載の三相電動機の保護装置において、
前記突起部(35)は、ハンダからなる部材(29)によって形成されていることを特徴とする三相電動機の保護装置。 - 請求の範囲第1項または第2項に記載の三相電動機の保護装置において、
前記弾性部材(34)は、前記ハウジング(22)に固着された支持体(31)を介して固定されていることを特徴とする三相電動機の保護装置。 - 請求の範囲第3項に記載の三相電動機の保護装置において、
前記回転防止部材は、前記支持体(31)において前記ハウジング(22)と前記弾性部材(34)とを連結する部分(31B)で構成されていることを特徴とする三相電動機の保護装置。
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
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JP2010536591A JP5294092B2 (ja) | 2008-11-05 | 2008-11-05 | 三相電動機の保護装置 |
MX2011004399A MX2011004399A (es) | 2008-11-05 | 2008-11-05 | Dispositivo protector de motor trifasico. |
PCT/JP2008/003177 WO2010052750A1 (ja) | 2008-11-05 | 2008-11-05 | 三相電動機の保護装置 |
CA2742715A CA2742715A1 (en) | 2008-11-05 | 2008-11-05 | Protective device of three-phase motor |
RU2011122676/07A RU2011122676A (ru) | 2008-11-05 | 2008-11-05 | Защитное устройство трехфазного электродвигателя |
CN200880131856.5A CN102203894B (zh) | 2008-11-05 | 2008-11-05 | 三相电动机的保护装置 |
EP08877946.7A EP2352160B1 (en) | 2008-11-05 | 2008-11-05 | Protective device of three-phase motor |
KR1020117011302A KR101178506B1 (ko) | 2008-11-05 | 2008-11-05 | 삼상 전동기의 보호장치 |
US13/127,600 US8264317B2 (en) | 2008-11-05 | 2008-11-05 | Protective device of three-phase motor |
BRPI0823249A BRPI0823249B1 (pt) | 2008-11-05 | 2008-11-05 | protetor para um motor elétrico trifásico |
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PCT/JP2008/003177 WO2010052750A1 (ja) | 2008-11-05 | 2008-11-05 | 三相電動機の保護装置 |
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EP (1) | EP2352160B1 (ja) |
JP (1) | JP5294092B2 (ja) |
KR (1) | KR101178506B1 (ja) |
CN (1) | CN102203894B (ja) |
BR (1) | BRPI0823249B1 (ja) |
CA (1) | CA2742715A1 (ja) |
MX (1) | MX2011004399A (ja) |
RU (1) | RU2011122676A (ja) |
WO (1) | WO2010052750A1 (ja) |
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RU213405U1 (ru) * | 2022-04-05 | 2022-09-12 | Общество С Ограниченной Ответственностью "Электро Пром Торг" | Коммутационный аппарат |
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US8801400B2 (en) * | 2011-07-08 | 2014-08-12 | Danfoss Scroll Technologies Llc | Secure connection terminal for hermetic compressor |
CN102568929A (zh) * | 2012-02-09 | 2012-07-11 | 上海航天科工电器研究院有限公司 | 外置式压缩机保护器 |
CN105006405A (zh) * | 2015-07-18 | 2015-10-28 | 安徽机电职业技术学院 | 一种防松动型电磁继电器的静端子结构 |
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CN102203894A (zh) | 2011-09-28 |
KR20110086072A (ko) | 2011-07-27 |
KR101178506B1 (ko) | 2012-09-07 |
JPWO2010052750A1 (ja) | 2012-03-29 |
EP2352160A1 (en) | 2011-08-03 |
CN102203894B (zh) | 2014-03-26 |
US8264317B2 (en) | 2012-09-11 |
EP2352160A4 (en) | 2012-12-05 |
JP5294092B2 (ja) | 2013-09-18 |
US20110210813A1 (en) | 2011-09-01 |
CA2742715A1 (en) | 2010-05-14 |
MX2011004399A (es) | 2011-06-16 |
BRPI0823249B1 (pt) | 2020-01-14 |
BRPI0823249A2 (pt) | 2015-06-23 |
RU2011122676A (ru) | 2012-12-27 |
EP2352160B1 (en) | 2016-04-06 |
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