CN1218969A - Apparatus mounted with relay - Google Patents

Abstract

A device with a relay, such as including air conditioner and refrigeration cycle of the refrigerator, the relay includes a protector portion for cutting passing through current based on the increasing of the current; and a thermoswitch portion for cutting passing through current based on the increasing of the temperature, in which the thermoswitch portion includes a movable contact plate with a contact; a dish-shaped bimetallic strip for switching on and off the movable contact plate; and a device for adjusting displacement of the bimetallic strip.

Description

The device of relay is housed

The present invention relates to a kind of device that relay is housed, it is particularly suitable for using in refrigerant cycles, comprises such as air conditioner and refrigerator, is used for protecting the compressor that is arranged on wherein.

For the compressor motor that in air conditioner or similar device, uses; the function of motor not only needs protection when its rotor is clamped and when moving with excessive load; and when serious situation occurring; comprise that refrigerant leaks; operation capacitor short-circuit and wire break; and under situations such as restarting after the instantaneous power interruptions, also requiring has response fast.In these cases,, there is the electric current of many situation motors will not have large increase, therefore only can not protects motor with the traditional protection device that mainly motor current is responded although the compressor of air conditioner is heated.

Therefore; proposed to be arranged on a kind of thermal protector in the compressor; wherein be provided with a main bimetal leaf P, it constitutes (seeing open No.Hei1-79240 (1989) of Japanese Utility Model and Japanese disclosure of the Invention No.Hei7-262895 (1995)) by a plate main bimetal leaf B etc. and a thermal switch TH as a unit.To explain these devices in more detail below.

First kind of conventional art has been shown in Figure 17 to 19.In these figure, Figure 17 shows the top plan view that comprises fragmentary cross-sectional view, and Figure 18 is the A-A ' profile among Figure 17, and Figure 19 is a circuit diagram.In these figure; near the main bimetal leaf B of main protection device P, be provided with a thermal switch TH1 who is opened usually and when it is closed, flow through a resistance R 1 of electric current; and, be a series circuit of this thermal switch TH1 and resistance R 1 that motor M is connected abreast with a load.

Promptly; motor M is connected on the power supply E by terminal a and b in the both sides of the main bimetal leaf B of main protection device P; and the end of resistance R 1 at main bimetal leaf be connected on its outlet terminal b, and its other end is connected on the thermal switch TH1 by a lead c.Another that the other end of thermal switch is connected to power supply by a lead d gone up mutually.

Connect by such circuit, under the clamped situation of operation or its rotor under the state of motor M in overload, owing to overcurrent raises its temperature main bimetal leaf B is disconnected, circuit is disconnected, and when just thinking that temperature raises, whether tube current does not keep a normal value thermal switch TH1 to be closed, the resistance R 1 that electric current is flow through be used for heating, thereby main bimetal leaf B is disconnected, circuit is disconnected.

Then, second kind of conventional art has been shown in Figure 20 to 23.In these technology, Figure 21 shows a top plan view, and Figure 22 is the A-A ' profile among Figure 20, and Figure 23 is a circuit diagram.In these figure, it is on the motor M that the thermal switch TH2 that normally closes and main protection device P are connected in series a load.In main protection device P, near its main bimetal leaf B, be provided with a heater wire R2, always, therefore, can protect motor M can not burnt at heating this bimetal leaf B, this is because thermal switch TH2 opens circuit when just thinking that temperature raises.In other words, two the terminal a of the bimetal leaf B of power supply by main protection device P and b, two terminals (being lead) c and the d of heater R2 and thermal switch TH2 are connected on the motor M, and therefore, they are to go up mutually the same of power supply.Therefore, compare, can make heater R2 by it to main bimetal leaf B or very little to the insulation distance of each self terminal with first kind of conventional art.Therefore, can be arranged to crooked shape to this heater such as the diameter and the length of Nichrome line or analog by suitably selecting material, or the shape that becomes coil to twine, can the deformation ability or the degree of freedom in design thereby improve.Yet, because main bimetal leaf B except by it self owing to also heated the motor current heating, so it can be used for using the system of fractional motor electric current by heater R2.

Yet with first kind of conventional art above-mentioned, main bimetal leaf B is only because self heating action of relatively large electric current, and this current ratio is as the electric current for the compressor motor that is usually included in the formation refrigerant cycles in the air conditioner etc.Therefore, if attempt is directly used this technology on the small size compressor of fractional motor electric current, because heat that main bimetal leaf produced is little, its is difficult to action, therefore, it must use big motor current the large scale compressor on.Also have,,, therefore when this resistance of selection, must carefully consider so power source voltage is applied directly on the resistance R 1 because the end of thermal switch TH1 is connected to opposite the going up mutually about main bimetal leaf B etc. of power supply.Also have, for being connected to another parts of going up mutually (that is, thermal switch TH1 and resistance R 1), for the purpose of the leakage of protective current requires to have sizable insulation distance.Owing to these reasons above-mentioned, this thermal switch TH1 is deposited in the single housing that into is separated, by it lead it extend to the outside.

Also have; it has following shortcoming: when the end-of-life of main protection device P and its contact are welded together; it stops its function simultaneously; this is because all open-and-shut actions of compressor are all realized by this main protection device P; and thermal switch TH1 can only play a servicing unit or aid-device (promptly; even when using two types relay in this device, useful life is still by a relay decision in two), thus the relay of long life can't be obtained.

Below; open and close the conventional art of compressor motor M for the relay that uses two types; although there is it can be used to use the advantage of the device of fractional motor electric current; this is because main bimetal leaf B is also heated by heater R2 except being heated by himself owing to motor current; but; with the diverse thermal switch TH2 of main protection device P the housing that separates is with it arranged; therefore; it has shortcoming: not only do as a whole necessary space and make its size bigger, and the temperature of motor M raises owing to heat conducting speed is low.Also have, the large scale of housing causes shortcoming: by its viewpoint of measures of installation, when on the surface of the compressor that puts it to air conditioner etc., it has interference with pipeline and electric component around it.Have again, thermal switch TH2 is installed in the limited space, and housing arranged, so, viewpoint by the ability that opens and closes the contact it seems that it is difficult that its opening and closing has the electric current of jumbo compressor motor, therefore, the possibility of welding that reaches the contact is very big, thereby not necessarily very high in the aspect of performance reliability in useful life.

Particularly; under the low situation of ambient temperature; because the character of bimetal leaf; the main protection device has long running time; and return time becomes shorter; therefore duty ratio (=running time/(running time+return time)) improves, and is very big thereby the danger that the compressor motor of air conditioner is burnt out becomes.

In order to protect it, thermal switch TH must detect the temperature of compressor motor M as quickly as possible, so that it is responded.And, when the increase according to electric current enters dissengaged positions apace circuit is opened, for main protection device P; also must after action, reduce duty ratio; this is high as much as possible by the maintenance temperature, and prolongs up to the time interval of returning, and heat radiation is not arrived the outside.Yet those traditional technology can not be accomplished these.

In order to address these problems, newly designed a kind of structure, be provided with a movable contact of cantilever style, and the thrermostatic bimetal-plate of a upset when heating has been set in the thermal switch part, wherein the rotary movement of this thrermostatic bimetal-plate upwards pushes away contact movably, the failure of current that flows through.Yet find: it can not positively return, and recloses power supply thereby hinder in its operation test process.

Therefore, the purpose of this invention is to provide the device that a relay is housed, after it made the operation upset, this relay can positively return.

According to the present invention, in order to realize purpose above-mentioned, provide the device that a kind of relay is housed, it is characterized in that this relay comprises:

A protector part is used for cutting off the electric current that flows through it according to the raising of electric current; And

A thermal switch part is used for cutting off the electric current that flows through it according to the rising of temperature, and wherein, described thermal switch partly comprises:

One of a contact movably contact plate is arranged;

The bimetal leaf of a dish type is used for making described movably contact plate to switch on and off; And

Be used for regulating the device that move the position of described bimetal leaf.

Also have, preferablely be, according to the present invention, in the device that relay is housed as described above, the device that move the described position that is used for regulating described bimetal leaf comprises a hole that is located on the described bimetal leaf and is located at a axial component corresponding with described hole in the base part, wherein, described axial component freely injects in the described hole.

Also have, according to the present invention, in the device that relay is housed as described above, the device that move the described position that is used for regulating described bimetal leaf comprises the surface of an inclination, and this surface is forming on the surface of a recess of a pedestal of the end surfaces of described dish type bimetal leaf at least.

Also have, according to the present invention, in the device that relay is housed as described above, the device that move the described position that is used for regulating described bimetal leaf comprises a sweep, it is that a end at described bimetal leaf is bent and forms, it is characterized in that described sweep can freely inject of being located on the hot radical seat and insert in the hole, described bimetal leaf is located on this hot radical seat.

Also have, according to the present invention, in the device that relay is housed as described above, the device that move the described position that is used for regulating described bimetal leaf comprises a sweep, it is that a end at described bimetal leaf is bent and forms, it is characterized in that described sweep can freely inject of being located on the described movably contact plate and insert in the hole.

Also have, according to the present invention, in the device that relay is housed described in claim 1, the device that move the described position that is used for regulating described bimetal leaf is included in the part that of forming in the part of described movably contact plate has been cut off and has raise, wherein, the described part that is cut off and has raise can freely inject of forming and insert in the hole in described bimetal leaf, freely inject simultaneously of forming and insert in the hole in a hot radical seat, described bimetal leaf is located on this hot radical seat.

Have, according to the present invention, in order to realize purpose above-mentioned, provide the device that a kind of relay is housed, it comprises:

A compressor;

A condenser;

A refrigerant cycles; And

Be contained in a relay on the described compressor; wherein a protector part and a thermal switch are partly connected into series circuit of formation; thermal switch partly is contained on the side of described compressor; between described protector part and described thermal switch part, a kind of insulating material is set; wherein, described relay comprises:

Described thermal switch part movably one of a contact contact plate movably arranged;

Be shaped as a bimetal leaf of the dish of upspringing, between the hot radical seat that its recess in being used in described thermal switch part forms, make it the curved surface of an indentations and described movably contact plate vis-a-vis; And

Be used for preventing that described bimetal leaf from moving to the device of the outside of described hot radical seat when it overturns.

The top plan view that Fig. 1 cuts open for the center line along it of relay is provided to show according to one embodiment of the present of invention (that is the top plan view on the A-A ' plane in Fig. 4);

Fig. 2 is and circuit diagram according to the relevant relay of embodiments of the invention;

Fig. 3 is and an indicative figure according to the relevant relay of embodiments of the invention;

Fig. 4 is the plane graph at the embodiment shown in Fig. 1;

Fig. 5 is the left side view at the embodiment shown in Fig. 1;

Fig. 6 is the profile on the B-B ' plane in Fig. 4;

Fig. 7 puts in the housing for a protection part and still lid and thermal switch is not partly loaded onto bottom view before;

Fig. 8 is the plane graph that lid and thermal switch part are shown;

Fig. 9 is the indicative figure that a part of parts of thermal switch part are shown, and is the top plan view of the arrow D-D ' in Figure 10 simultaneously;

Figure 10 is the flat sheet of the bottom view of Fig. 9;

Figure 11 is the side plan view of the arrow E-E ' in Figure 10;

Figure 12 is the block diagram for the refrigerant cycles of air conditioner, and wherein its compressor is equipped with according to relay of the present invention;

Figure 13 is the view that an alternative embodiment of the invention is shown;

Figure 14 is the view that an alternative embodiment of the invention is shown;

Figure 15 is the view that another embodiment of the present invention is shown;

Figure 16 is the view that another embodiment of the present invention is shown;

The top plan view of first kind of conventional art that Figure 17 is broken away for its part;

Figure 18 is the profile of A-A ' section among Figure 17 of first kind of conventional art;

Figure 19 is the circuit diagram of first kind of conventional art;

Figure 20 is the plane graph of second kind of conventional art;

Figure 21 is the top plan view among Figure 20 of second kind of conventional art;

Figure 22 is the profile of A-A ' section among Figure 20 of second kind of conventional art;

Figure 23 is the circuit diagram of second kind of conventional art.

Below, will fully explain with reference to accompanying drawing according to embodiments of the invention.

Below, with reference to first embodiment of Fig. 1 to 12 explanation according to thermal relay of the present invention.The top plan view that Fig. 1 cuts open for the center line along it of this device (promptly, the top plan view on the A-A ' plane in Fig. 4), Fig. 2 is a circuit diagram, Fig. 3 is an indicative figure of the major part of present embodiment, Fig. 4 is a top plan view, Fig. 5 is a left side view, and Fig. 6 is the B-B ' profile in Fig. 4.Fig. 7 puts in the housing for a protection part and still lid and thermal switch is not partly loaded onto bottom view before, and Fig. 8 is the plane graph that lid and thermal switch part are shown.Fig. 9 to 11 is for illustrating the indicative figure of thermal switch parts partly, wherein Fig. 9 is by a top plan view shown in the arrow D-D ' among Figure 10, Figure 10 is a bottom view, Figure 11 is a represented side plan view of the arrow E-E ' among Figure 10, Figure 12 is a block diagram, shows the state of putting into the compressor of the refrigerant cycles that is used for air conditioner according to relay of the present invention.

A thermal relay 1 is contained on the outer surface 7 of a compressor, this compressor is protected object.The shell body that label 2 expressions are made by insulating material, it comprises a columniform housing 3, this housing has an end of opening and a lid that is used for this end of opening is closed in its side.This lid comprises a hot radical seat 4 and cap 6 of a thermal switch 30.

After a protector 10 is put into the inside of this cylindrical housings 3, thermal switch part 30 is injected, place a kind of deformable insulating material simultaneously, such as a kind of pi paper, or a kind of phenol laminated sheet, or analog.Thermal switch part 30 always is in the state of shut-off circuit, but opens under a predetermined temperature.Also have, bonding agent 8 is filled in the filling part, this part is exposed to outside (that is, the part of lateral terminal 33 movably, the back will be mentioned), thereby it is covered, and cap 6 is fixed on this part.

Below protector part 10 is made an explanation.A main bimetal leaf of label 11 expression dish types, 12 expressions are contained in a set screw at the center of a bottom 3A relative with the end of opening of cylindrical housings 3 above-mentioned with screw thread, helical spring of 15 expressions wherein leans against a head 13 that pushes away set screw 12 on this spring this main bimetal leaf 11 is fixed.This set screw 12 is made of a threaded portion 12A and head 13, is that the tin of 232 degree are fixed to one another this threaded portion and head with a kind of metal that can heat fusing such as fusing point, and after finishing adjusting, the bonding agent 16 that is used as its locking piece is fixed this screw.Referring to Fig. 4 to 6, label 17 and 18 expression fixed charge method end plates, they have the fixed contact 19 and 19 of so-called mosaic respectively, their are injected and vertically be provided with, this is to lean against it is injected after slotted eye 3B on the 3A of the bottom of cylindrical housings 3 or the 3C its two side portions of each shank is carried out the caulking joint realization.By means of for example spot welding or similar approach a tab terminal 20 is fixed on the outer end of a fixed charge method end plate 17, is used for connecting a lead (not drawing in the drawings) from power supply.Being located at movably contact 21 on the main bimetal leaf 11 contacts with 19 with fixed contact 19 that it is faced toward respectively or throws off.Also heater end plaste 22 is injected among the slotted eye 3D that is positioned, leave 90 degree (see figure 4)s with the center of the bottom 3A of cylindrical housings 3, and vertically be provided with, its mode is identical with fixed terminal plate above-mentioned 17 and 18.In Fig. 6, the heater 23 of Nichrome line is arranged near the main bimetal leaf 11 above-mentioned, with it vis-a-vis, this main bimetal leaf 11 is heated, and its two ends are connected respectively on another fixed terminal plate 18 above-mentioned and the heater end plaste 22 by means of for example spot welding or similar approach.

As shown in FIG. 7, cylindrical housings 3 is made of a double wall at the outer wall of that side of main bimetal leaf 11, has with a madial wall 3F of the lateral edges of main bimetal leaf 11 and a sidewall 3G of its periphery circle or ring.Therefore; air is kept between them in the formed capacitor (with insulating material 5 and back with the hot radical seat 4 mentioned these air seals); form a thermal insulation layer, thus it the inside and the protection of outside part between the thermal insulation function is arranged.In other words; by the external shape that keeps cylindrical housings 3 and measure-alike, make its madial wall 3F corresponding, though the volume that protector 10 leaves in wherein becomes narrower with the external shape of main bimetal leaf 11; yet, a thermal insulation space can be provided between them.This madial wall 3F is arranged on the axial direction of cylindrical housings, and therefore, it can form as a unit simultaneously with cylindrical housings 3, and special structure is arranged without any necessity being used for forming or cast on the metal die of this cylindrical housings 3.And this thermal insulation space is to be closed at its opening portion with insulating material 5 above-mentioned, so prevented the convection current of air in its inside, has therefore improved thermal insulation properties.

Like this; usually; in this protector part 10; electric current flows to (input) by the permanent joint sheet terminal 20 of a fixed terminal plate 17; and by this fixing end plaste 17, movably the contact 21, fixing contact 19; end plaste 18 and heater 23 that another is fixing reach heater end plaste 22.Yet; what also will address is; can be closed thermal insulation above-mentioned space with a lid; be used for the end of opening of cylindrical housings 3 is closed; have only protector part 10 to leave in this space simultaneously; and, in housing, also can obtain identical effect, and let it be internal structure is how.

Then, outwards set up a caulk part at the center of the bottom of cylindrical housings 3 3A, its thickness (being the T among Fig. 1) is equal to or greater than 2 times of thickness (i.e. t in Fig. 1) of its other parts, therefore, when injecting bonding agent 16, not only set screw 12 is fixed on the cylindrical housings 3 at its top, and the bonding agent 16 that is injected into enters its threaded portion 3J along the other parts of this set screw 12, thereby this screw is fixed on the cylindrical housings 3 in other parts.In this case, above-mentioned bonding agent 16 stops in caulk part, and this is because threaded portion has caulk part, so bonding agent will not arrive a side of bimetal leaf 11.

Like this, because need not fix between this set screw 12 and cylindrical housings 3 by a nut, so in a single day regulate when binding nut, the position of main bimetal leaf will change never again.Perhaps, helical spring acting force of the spring always is applied to main bimetal leaf and between the standing part on its axial direction, so this set screw will not fluff.

Also have, make helical spring 15 shift main bimetal leaf 11 other end of the head 13 of set screw onto, stably fix by means of a recess 3L, this recess of formation on the bottom of cylindrical housings 3, recessed its half of thickness is more than (1/2).Thereby; when realizing that by size between the diapire of shorten main bimetal leaf 11 and cylindrical housings 3 or distance size is become hour; this recess can hold the length of spring; therefore; even the distance between protector part 10 and the thermal switch part becomes more in short-term, still can use an existing spring (constant spring etc.).

The height of the caulk part 3J that forms on the basal surface 3A of cylindrical housings 3 is chosen to lower than terminal above-mentioned 20 and 37, these terminals are vertically stretched out by the basal surface 3A of cylindrical housings, and, the top of the set screw 12 of being stretched out by above-mentioned threaded portion 3J is also low than terminal above-mentioned 20 and 37, thereby in not effective space, form the threaded portion of this set screw, several terminals and other article put in this effectively in space, this effectively space do for this device and as a wholely on its size, do not allow.

When too high electric current flow in this protector part 10, contact 19 and 21 was cut off in main bimetal leaf 11 actions, and when temperature lowered after contact 19 and 21 is cut off, this main bimetal leaf 11 returned, and once more contact 19 and 21 was connected.When this operation repeated repeatedly, the contact was soldered, thereby main bimetal leaf 11 is taken to the state of a danger, and the state of this danger is the state that can not move.Yet; in this case; heater 23 is connected continuously by electric current; therefore; because the such heat that produces and as the increase of the heat of the compressor of protected object; between the threaded portion 12A of head 13 and set screw 12, be connected can heat fusing metal begin fusing, helical spring 15 upwards pushes away main bimetal leaf 11, contact 19 and 21 cut-outs.After this, main bimetal leaf 11 will turn back to previous position never once more, and be in a kind of state that can not return.

Helical spring 15 makes the state that the contact 19 and 21 of main bimetal leaf disconnects mandatoryly motor current rise to overcurrent, and causes the state of welding on the contact of this main bimetal leaf 11, thus the state that electric current is excessively flow through.Under such state, when main bimetal leaf 11 being compelled to property ground cuts off, because electric arc will appear in excessive electric current.If form such electric arc, transversal make a circuit of main bimetal leaf bypass set up bridge circuit, such as setting up bridge circuit between the fixing terminal 19 of a side of fixing end plaste 17 and the terminal 31 of fixing of thermal switch 30 in motor one side, can not cut off main circuit, thereby cause a problem: electric current continues to flow through.

Therefore, must keep the distance between protector part 10 and the thermal switch 30, make and between them, will can not set up electric arc.Yet if attempt keeps such distance, the size of thermal relay self will become bigger so, particularly its height.In order to address this problem, according to present embodiment, make insulating material 5 be positioned at following position: after main bimetal leaf 11 forwarded the state that can not return to, insulating material only touched set screw 12 at its top, and did not reach movably contact 34 after 30 operations of thermal switch part.Like this, be that enough those devices are compared with keeping such distance for disperseing such electric arc, can reduce or shorten the size on the short transverse, thus the height of reduction thermal relay self.Yet; have in the device of the protector part 10 that is not the type that to return at those; in set screw 12, do not use this metal 14 that can heat fusing; much less; because continuously with the electric current heat energy that 23 energisings are produced to heater and because the raising of the temperature of protected compressor; the thermal switch part of mentioning later 30 will be activated, or begin action, so that guarantee safety.

Below, will explain the details of thermal switch part 30.Fixing side terminal of label 31 expressions, it has the fixed contact 32 of a mosaic on sweep 31B, 33 represent a movably side terminal, 34 represent a movably contact plate, at its free end contact 35 of can heat moving is arranged, and thrermostatic bimetal-plate of 36 expressions.Form fixing side terminal 31 and side terminal 33 movably in the hot radical seat 4 by injecting, the function of hot radical seat 4 for cylindrical housings 3 open end as the lid seal identical with cap 6, terminal 31 and terminal 33 have extension 31A and the 33A as terminal respectively.

In Fig. 1 and 9; on hot radical seat (lid) 4, side terminal movably 33 is inserted a predetermined position; owing to use a part 33B who broadens of the movably side terminal 33 that is shaped as fan-shaped or section shape; in its both sides hook portion 33C is arranged, can be transmitted to effectively on this hot radical seat from the heat of protected object.Be provided with in the centre of this part 33B that broadens and cover an extension 4A of 4, the shape of an arc is arranged on its cross section.By after an aperture 34A of pedestal end who its is injected at it, a little extension 33D of side terminal movably being carried out caulking joint, fixing the movably contact plate 34 of deformable metal, thus contact with the contact of fixing 32 or separate at free-ended thermal contact 35.Referring to Fig. 3, thrermostatic bimetal-plate 36 is being surrounded by hot radical seat 4 between contact plate 34 movably and the arc extension 4A at the center of lid 4 on four (4) the individual directions of its end surface, and, the axial component 4C that on hot radical seat 4, forms inject respectively with its corresponding thrermostatic bimetal-plate 36 among the set hole 36A after, it is assembled into, move in order that prevent thrermostatic bimetal-plate 36, or the encirclement that hot radical seat 4 is shifted out in motion when it returns.Usually, thrermostatic bimetal-plate 36 is in the shape of stretching out as at upside shown in Figure 1, and movably contact plate 34 because it self all elastic acting forces are carrying in its contact 35 of can heat moving at top contacts with the heat fixation contact 32 that it is faced toward.When making this thrermostatic bimetal-plate 36 be elevated to a predetermined temperature, this thrermostatic bimetal-plate 36 turns back to the shape (promptly recessed on the direction that makes progress) of stretching out downwards, thereby opens or cut off contact 32 and 35, disconnects suddenly.

In the following manner being contained on the cylindrical housings 3 in the thermal switch part 30 of making as a unit on the hot radical seat 4.Referring to Fig. 1 and 4; by their extension 31A and 33A are injected respectively among slotted eye 3D and the 3E; side terminal 31 that installs and fixes and the movably side terminal 33 of stretching out by thermal switch part 30; slotted eye 3D and 3E be located at protector part 10 above-mentioned in fixing terminal 17 position (that is, online A-A ' on) vertical on the 3A of the bottom of cylindrical housings 3 with 18 center line B-B '.And, by means of spot welding or similar approach extension 33A being fixed on the heater end plaste 22, this plate injects among the slotted eye 3D in advance, or vertically is arranged among the slotted eye 3D.Simultaneously, with identical mode above-mentioned, with spot welding or similar approach the extension 33A that injects the fixing side terminal 31 among the slotted eye 3E is fixed on the tab terminal 37, make this terminal 37 location by inject step portion 3E ' by the outside.Tab terminal 37 is an outlet terminal for the motor M as protected object.By these a series of operations above-mentioned, thermal switch part 30 is fixed on the housing 3, its mode makes protector part 10 be in the state that is connected by relaying with thermal switch part 30 on slotted eye 3D.As above-mentioned, the function of the tab terminal 20 of protector part 10 is an input terminal of power supply, and the function of the tab terminal 37 of thermal switch part 30 is for the outlet terminal as the motor of load.

Yet, as shown in the circuit diagram of Fig. 2, according to all parts of the thermal relay of present embodiment all be arranged on power supply same mutually in, therefore, can see, even input side and outlet side are put upside down, can not cause hell and high water yet.

Therefore, as can being seen,, thrermostatic bimetal-plate 36 is made by about foursquare material, and it is designed to its winding direction reverses under a predetermined temperature by its making by Fig. 8.As shown in Fig. 9 and 8, lean against the inside the recess 4B that forms and the axial component 4C guiding and the stationary heat bimetal leaf 36 that are located in the recess 4B of hot radical seat 4, thereby thrermostatic bimetal-plate 36 reeve arc extension 4A and between near the movably contact plate 34 its center.

In Fig. 1, when heat being added to when causing the action of putting upside down on the thrermostatic bimetal-plate 36, this thrermostatic bimetal-plate 36 deforms, upwards recessed (or stretching out downwards).Yet, as as shown in Fig. 1 and 3, the right side edge of this thrermostatic bimetal-plate is positioned at that side that is fixed of the movably contact plate 34 on the figure, therefore, motion when it returns on figure on short transverse is restricted, thereby makes this thrermostatic bimetal-plate as an integral inclination, its right side reduce put upside down action amount (promptly, the extension 4A of the above-mentioned arch section of wearing or featuring stage armour lid 4 raises left side edge as a joining).In other words, contact plate 34 is movably upwards pushed away, thereby make two contacts 35 and opened in 32 minutes, thereby cut off circuit.Like this, the left side edge of thrermostatic bimetal-plate 36 in the drawings upwards jump than in the drawings it put upside down before the action higher (promptly with afterwards difference in height, the reason that is supported by loosely at its right-hand end owing to the reason of the shape of stretching out of arc extension 4A and thrermostatic bimetal-plate 36, left side edge is freely moved, and with relatively large quantity motion).Therefore, the top of driven movably contact plate 34 and the 35 non-constant width ground, contact that can heat move with move rapidly.Therefore, they can move and leave a big like this distance, even form also can be this arc cutting for electric arc, thereby can positively cut off electric current.

Below, explanation is arranged on function and the effect of the axial component 4C in the hot radical seat 4.Suppose that thrermostatic bimetal-plate 36 is in free state (under the situation of the hole 36C that does not have axial component 4C and be used for hooking with this axial component 4C) here.Thermal relay is heated, and make thrermostatic bimetal-plate 36 counteragents (with the recessed shape that makes progress in Fig. 1).This move occurs suddenly, occurs its moving of position sometimes.When thrermostatic bimetal-plate 36 under the condition that moves in the position turns back to its original shape (shape that protrudes upward) in Fig. 1, particularly (this may be a fin or protuberance sometimes at the step shape part of its periphery at its edge quilt when thrermostatic bimetal-plate 36, or the part of structure) when blocking or hooking, it can return with the state that tilts.Therefore, find that movably contact plate 34 is in a kind of quick condition that hinders thrermostatic bimetal-plate 36, thereby causes unfavorable contact, in this case, contact 35 does not contact with contact 32.Can not easily solve this unfavorable contact, this is because thrermostatic bimetal-plate 36 is in the state that is pushed away by contact plate 34 movably, and restitution power works to this plate 34 on the part of the ladder dress of its periphery.

Therefore, according to present embodiment, (it can be a projection at arc extension 4A, in a word, it can be for regulating the Any shape that moves of thrermostatic bimetal-plate 36) the peak part near be provided with axial component 4C, in thrermostatic bimetal-plate 36, be provided with hole 36C simultaneously with the corresponding position of this axial component 4C.By such structure, can be in move its position at all around direction adjusted thrermostatic bimetal-plate 36, therefore, it will not shift out recess 4B, cause unfavorable action owing to hooking it, thereby providing such effect: can guarantee to open for a long time-closing motion, repetitive operation reposefully, and high reliability is arranged.

To explain the operation of thermal relay above-mentioned below.When flowing through overcurrent owing to the overload of motor; compressor is by this motor running or rotation; as a load, or when its rotor was clamped, main bimetal leaf 11 and heater 23 produced heat; temperature rising when main bimetal leaf 11; and when for example reaching 160 degrees centigrade, the shape of its dish type turns, and makes two transportable contacts 21 be opened; or separate, thereby protect motor M by the electric current that interrupt flow is crossed it with two fixing contacts 19.After this; owing to emit heat by having the cylindrical housings that is used for heat-insulating space; the heat that can get rid of the protector part; by using cylindrical housings to form this thermal insulation space; thereby make during start-up time shorter; and longer during the return time, thus guarantee for example protective value of the compressor of air conditioner, and reduce coil temperature.

If just in case because the leakage of cooling agent, only temperature rises, and electric current does not improve, particularly when as shown in FIG. 1 the thrermostatic bimetal-plate that protrudes upward like that 36 ((A) with this figure illustrates with solid line) under normal temperature conditions for example rises to 120 degrees centigrade, discoid pieces turns suddenly, contact plate 34 is movably upwards pushed away, thereby make contact separately (in Fig. 1 (A), dotting).Like this, two relays promptly, cut off the relay of electric current respectively for different purpose actions it does not just resemble in conventional art, can obtain the effect that reliability improves.Also have, because the energy when bimetal leaf overturns can be utilized, and do not disappear, so can obtain a thermal switch part, it is difficult to cause welding at the place, contact.This provides the long-life performance of relay, steady operation for a long time.Therefore, can obtain a kind of in all n zones by big ability to the fabulous relay of the compressor motor operation stability of little ability, high reliability is arranged.

Yet; between protector part and thermal switch part, insulating material is arranged; therefore; even any one in them is cut off; an obstacle will can not influence another such as electric arc; and the heat that the protector part is produced can gather in the protector partial product, thereby a fast response can be arranged the variation of heat.Also have, a kind of measure is provided, prevent to shift out in the encirclement of bimetal leaf by pedestal of thermal switch part, therefore, can be moved stably, thereby also make and to avoid in on/off operation and the relevant shortcoming of contact welding by contact plate movably.

Below, will provide explanation with reference to Figure 13 to 16 to additional embodiments, in these embodiments, adjusted the position (that is, protection does not move away them) of thrermostatic bimetal-plate 36.Figure 13 shows the major part of the thermal switch part 30 of second embodiment.The aspects different with embodiment above-mentioned are, are provided with the surperficial 4D of an inclination on the inner surface of recess 4B, round four end surfaces of the bimetal leaf 36 of the hot radical seat of this thermal switch part 30.Therefore, because the effect of this inclined surface 4D and/or function make this bimetal leaf 36 original position of overturning go back to, even so operation of repeatedly overturning, it will not cause the undesired of operation, and promptly bimetal leaf is hooked on the guiding piece of the insulating paper on the inner surface that is located at recess 4B.Yet this inclined surface 4D can be positioned at the front side, or rear side, or the left side, or the right side.In addition, should address, uprise by the height that makes recess 4B and can obtain similar effects.

Below, will explain the 3rd embodiment with reference to Figure 14.In this embodiment, by sweep 36A of end formation of crooked and folded heat bimetal leaf 36, and described sweep 36A freely injected among the patchhole 4E, this hole is located on the hot radical seat 4.Because on the base part of contact plate 34 movably, be provided with this insertion portion, so even the movably distance in the pedestal side is shorter when this thrermostatic bimetal-plate 36 turns, thereby its position will not be left.Also have, among first embodiment that mentions in the above, hot radical seat 36 rotates round the center of axial component 4C, leaves moving of position so there is certain possibility to cause.Yet,,, reduced the possibility that moves away its position because adjusted position in the horizontal direction according to present embodiment.Also have,, can have very big possibility to turn back to its original position even left its position.

Figure 15 illustrates the 4th embodiment.In this embodiment, be provided with the part 36B of a bending in an end of bimetal leaf 36, described sweep 36B freely injects among the patchhole 34B, and this hole is arranged on movably on the contact plate 34.Because this patchhole is arranged on the side of the pedestal of contact plate 34 movably, the danger or the possibility that shift out are very little, and be similar with the 3rd embodiment above-mentioned, and, also can prevent shifting out in the horizontal direction.There is no need to handle on hot radical seat board 4, this insertion portion is located in the dead space, thereby makes and can effectively utilize the space.

Figure 16 shows the 5th embodiment.In this embodiment, be provided with a part 34C who has been cut off and has raise in the part of contact plate 34 movably, the described part 34C that is cut off and has raise freely injects among the patchhole 36C who is located in the bimetal leaf 36, and injects and be located among the patchhole 4E of hot radical seat 4.This also plays the similar effects of the 4th embodiment above-mentioned.

Below, will explain an example, above-mentioned in this example thermal relay is used for the compressor motor that uses at air conditioner by the protective device as it.In Figure 12; label 38 be a compressor (promptly; protected object); it comprises a compression mechanism section, is used for part compression refrigerant an inside, but does not draw in the drawings; and be used for making refrigerant cycle by condenser 39 etc.; this will mention in the back, and comprise a motor part, its drive compression mechanism part 38.Label 40 is a fan, is used for cooling off condenser, and 41 is that pressure reduces device, and 42 is a refrigerator or refrigerator, and 43 be a fan, is used for forcing cooled air in inside.These compressors 38, condenser 39, pressure reduce device 41 and refrigerator or refrigerator 42 and successively are connected in series, and further connect into circulation, make to constitute a refrigerant cycles.Yet if with opposite direction circulating cooling agent, it can be used for heating.Also have, explain here to be used as air conditioner, but also can be used as a refrigeration machine, such as refrigerator etc.

The peak of the compressor 38 that the relay top loading of Fig. 9 to 11 and Figure 13 and 14 being explained by an installed part 44 or analog is mentioned is partly gone up (certain, as the thermal switch part 30 of this relay directly or indirectly to be contained on the surface of above-mentioned compressor 38).The air conditioner of this spline structure is arranged because it is by relay protection above-mentioned, so show that the impaired possibility of product itself is very little.

In other words, (1) flows through above-mentioned motor than high several times under a normal condition lock current under the situation that compressor motor is pinned by any reason.In this case, when the surface temperature of compressor was hanged down, thermal switch part 30 was failure to actuate, yet, protector part 10 (main bimetal leaf in the drawings) action.Repeat to connect-turn-off in the time of action at main bimetal leaf, case temperature raises gradually, occurs abnormal temperature on the surface of compressor.Above-mentioned thermal switch part 30 detects this variation, stops the operation (this is identical with the situation that air conditioner moves under abnormal load) of air conditioner.

(2) compressor under the low-voltage operation or under any situation of moving under the high voltage, the electric current that flows through motor all raises.In this case, with identical mode above-mentioned, thermal switch part 30 is followed 11 actions of main bimetal leaf, stops the operation of air conditioner.Perhaps, in being installed, the refrigerant cycles of this compressor causes that above-mentioned compressor is moved under the situation of accident of gas leakage under the low load of abnormality.Therefore, little electric current passes through motor, the electric current under this current ratio normal condition little several times (being part).

Yet the electric current that flows through is little, but the surface temperature of the temperature of motor coil and compressor raises.In this case, the thermal switch part also detects the surface temperature of compressor, stops the operation of air conditioner.

The running status that air conditioner according to the relay-set of various embodiment explained before is mentioned above demonstrating is housed, therefore, can protects compressor and air conditioner in advance, make it unlikely damage.Also have; because insulating material is between protector part 10 and thermal switch part 30 in the superincumbent thermal relay; because cylindrical housings has the thermal insulation space; and because protector 11 and the thermal switch part 30 that comprises heater 23; and compressor motor all is connected in series; or the like; so a kind of protective device that high reliability is arranged can be provided; and by the space between cutting protector part 11 and the thermal switch part 30; obtain little external dimensions; thereby can easily install on the compressor surface, and can not become the obstacle that other device or tubing are set.

Also have; by protector part and thermal switch part are set in a common housing; two functions of components of conventional art are provided simultaneously; can obtain the function in two stages; this comprise protection can not be subjected to the infringement of overcurrent and prevent overheated; also lean against between protector part and the thermal switch part and be provided with insulating material, can bring following effect yet: when in two any one is cut off, the influence of electric arc etc. will can not expand to another part.In this case, because insulating material can adopt pi paper or phenol laminated sheet etc., these materials obtain on market usually easily, thereby make and can easily handle.

Also have, can be safely and positively carry out the turning operation of repetition of the bimetal leaf of thermal switch, thus obtain to have the thermal switch part of high reliability.Such result is, the device that this class is housed has protector part and thermal switch relay partly brings the effect of the reliability that improves it greatly.

According to the present invention who has fully described, in the device of this relay was housed, the thrermostatic bimetal-plate of thermal switch part can positively reverse after the operation conversion of this device, thus feasible can be positively energized once more.

Claims (7)

1. the device that relay is housed is characterized in that, this relay comprises:

A protector part is used for cutting off the electric current that flows through it according to the raising of electric current; And

A thermal switch part is used for cutting off the electric current that flows through it according to the rising of temperature, and wherein, described thermal switch partly comprises:

One of a contact movably contact plate is arranged;

The bimetal leaf of a dish type is used for making described movably contact plate to switch on and off; And

Be used for regulating the device that move the position of described bimetal leaf.

2. according to the described device that relay is housed of claim 1, it is characterized in that, the device that move the described position that is used for regulating described bimetal leaf comprises a hole that is located on the described bimetal leaf and is located at a axial component corresponding with described hole in the base part, and described axial component freely injects in the described hole.

3. according to the described device that relay is housed of claim 1, it is characterized in that, the device that move the described position that is used for regulating described bimetal leaf comprises the surface of an inclination, and this surface is forming on the surface of a recess of a pedestal of the end surfaces of described dish type bimetal leaf at least.

4. according to the described device that relay is housed of claim 1, it is characterized in that, the device that move the described position that is used for regulating described bimetal leaf comprises a sweep, it is that a end at described bimetal leaf is bent and forms, it is characterized in that, described sweep can freely inject of being located on the hot radical seat and insert in the hole, and described bimetal leaf is located on this hot radical seat.

5. according to the described device that relay is housed of claim 1, it is characterized in that, the device that move the described position that is used for regulating described bimetal leaf comprises a sweep, it is that a end at described bimetal leaf is bent and forms, it is characterized in that described sweep can freely inject of being located on the described movably contact plate and insert in the hole.

6. according to the described device that relay is housed of claim 1, it is characterized in that, the device that move the described position that is used for regulating described bimetal leaf is included in the part that of forming in the part of described movably contact plate has been cut off and has raise, it is characterized in that, the described part that is cut off and has raise can freely inject of forming and insert in the hole in described bimetal leaf, freely inject simultaneously of forming and insert in the hole in a hot radical seat, described bimetal leaf is located on this hot radical seat.

7. device that relay is housed, it comprises:

A compressor;

A condenser;

A refrigerant cycles; And

Be contained in a relay on the described compressor; wherein a protector part and a thermal switch are partly connected into series circuit of formation; thermal switch partly is contained on the side of described compressor; between described protector part and described thermal switch part, a kind of insulating material is set; wherein, described relay comprises:

Described thermal switch part movably one of a contact contact plate movably arranged;

Be shaped as a bimetal leaf of the dish of upspringing, between the hot radical seat that its recess in described thermal switch part forms, make it the curved surface of an indentations and described movably contact plate vis-a-vis; And

Be used for preventing that described bimetal leaf from moving to the device of the outside of described hot radical seat when it overturns.

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