JP2006048988A - Thermostat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote the stabilization of an operation restoration temperature at a cancellation time of defrosting in a thermostat having a defrosting push button or the like that controls the inside temperature of a storage room of a refrigerator or the like. <P>SOLUTION: On the end face on a differential lever 37, because a round hole 37d is formed which is larger than a differential pin stem 38 but smaller than a differential pin stepped part 38a, and there is a clearance between the differential pin 38 stem and the differential lever 37, the frictional force of a penetrating hole 32 that penetrates the differential pin 38 and a cam 33 is made difficult to be added to the differential lever 37 engaged with the differential pin 38, so that a stable defrosting restoration temperature can be obtained in which temperature variations are reduced. Furthermore, after inserting the differential pin 38 through the differential lever round hole 37d, a cap 38d is mounted on the differential pin lower end 38c, or the differential pin lower end 38c is molded to form a constitution having a larger diameter than that of the round hole 37d of the differential lever 33, so that the differential pin can be incorporated easily without using a special kind of a jig or the like, and that an inexpensive thermostat can be supplied in which the numbers of assembling man-hours is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thermostat having a defrosting function such as a pushbutton for defrosting operation used in a refrigerator or the like.

  Conventionally, this type of thermostat has a function of removing frost adhering to a refrigerator cooler by controlling a circuit of a cooling compressor by operating a push button (see, for example, Patent Document 1).

  5, FIG. 6 and FIG. 7 show a conventional thermostat described in Patent Document 1. FIG. As shown in FIGS. 5, 6, and 7, one end 2 a of the lever 2 is pivotally supported on the casing 1 made of a U-shaped box, and the other end is engaged with the opening / closing spring 3. A compression spring 5 with one end placed on a spring receiver 4 provided in the middle part of the lever 2 is placed opposite to the bellows 6, and contacts (movable contacts 7, fixed contacts 8) are opened and closed on the tip of the lever 2 side. The other end of the compression spring 5 is pivotally supported so that the one end 10a can be rotated, and the other end is brought into contact with the cam surface of the displacement cam 11 having the through hole 11a. One end portion 12a is pivotally supported by the lever 10, and the other end portion is provided with a deflation bar 12 provided with a contact portion 12b so as to be in contact with the lever 2. One end of a wire spring 13 that reverses the deflation bar 12 is engaged with the cam 11, and the push button 14 The attached differential pin 15 is inserted, the adjustment plate 16 is connected to the adjustment lever 10, the tip of the adjustment plate 16 is brought into contact with the deflation bar 12 so as to face the diff pin 15, and a circular hole 12c and a groove formed in the deflation bar 12 are provided. A hole 12d is provided, and two flange portions (15b, 15c) and a shaft portion sandwiched between both flange portions are fitted into the lower end portion 15a of the differential pin 15 so as to fit into the groove hole 12d of the deflation bar 12. is there.

  The operation of the thermostat configured as described above will be described below.

  First, when the temperature of the temperature sensing part rises, the pressure of the gas in the capillary tube rises, causing the bellows 6 to expand. As a result, the spring receiver 4 is pushed up against the force of the compression spring 5, and the lever 2 is rotated in the direction of the arrow by the action of the force of the opening and closing spring 3, and is stopped by hitting a stopper (not shown). Accordingly, the arm 9 is detached from the contact plate (not shown), the movable contact 7 is adhered to the fixed contact 8, and an on-circuit is formed. When the temperature of the temperature sensing portion decreases, the bellows 6 contracts, and the spring receiver 4 descends due to the force of the compression spring 5, and the lever 2 rotates in the direction of the opposite arrow due to the decrease in the acceleration force of the opening and closing spring 3. . At the same time, the arm 9 descends, hits a contact plate (not shown) and pushes it down to release the movable contact 7 from the fixed contact 8 as shown. That is, an off circuit is formed. At this time, the lever 2 is stopped by a stopper (not shown).

  The above is a general action of the thermostat due to temperature. Next, the action of the push button operation will be described. When the push button 14 is pushed down against the force of a return spring (not shown), the differential pin 15 is lowered, the deflation bar 12 is lowered along with the deflation pin 15, and the deflation bar 12 is lowered. Due to the reversal action, it pivots downward, the abutment portion 12b of the deflation bar 12 contacts the lever 2, forcibly pivots the lever 2 downward, opens the contacts 7 and 8, and an off circuit is formed. At that time, the push button 14 is stationary at the position where it is pushed by the reversal force of the wire spring 13.

On the other hand, when the push button 14 is operated, the contacts 7 and 8 which are turned off are closed as follows. That is, when the temperature becomes higher than the initial temperature, the lever 2 starts to rotate upward against the force of the wire spring 13, and the lever is reduced by the downward acceleration force of the opening / closing spring 3 and the wire spring 13. 2 rapidly reverses, closes the contacts 7 and 8, forms an ON circuit, and the deflation lever 12 is pushed back by the lever 2, and returns to its original position by the action of the wire spring 13.
Japanese Utility Model Publication No. 57-6029

  However, in the above conventional configuration, when the contacts 7 and 8 that are turned off are turned on at a high temperature, the lower end portion 15a of the differential pin 15 has two flange portions (15b and 15c) and both flange portions. Since the pinched shaft portion is fixed by being fitted into the slot 12d of the deflation bar 12, the fixing portion of the deflation bar 12 and the diff pin 15 rotates along an arc-shaped track with the one end portion 12a supported as a fulcrum as a fulcrum. Move. Similarly, the differential pin 15 does not move in the vertical vertical direction, but moves up and down while contacting the side surface portion of the through hole 11a formed in the operation shaft of the cam 11, and the sliding friction force causes the reversal force of the deflation bar 12 to be reversed. At the same time, the temperature at which the differential pin 15 returns to the original position and the contacts (7, 8) return from OFF to ON by acting in a direction that prevents the reversing force of the lever 2 is affected by the frictional force. That is, there is a problem that the return temperature varies and may change.

  Furthermore, when inserting the flange portions (15b, 15c) of the differential pin 15 into the deflation groove 12d, it is necessary to securely insert and engage without any rattling or displacement. A dedicated jig or the like is required, and there is a problem that the number of man-hours for assembly becomes large.

  The present invention solves the above-mentioned conventional problems, and the return on temperature after defrosting by pushing a push button or the like is made stable with little variation in operation, to reliably realize defrosting of the refrigerator, An object of the present invention is to provide a stable thermostat having a small number of assembly steps, which is not affected by the dimensional accuracy of parts and does not require complicated dedicated jigs.

  In order to solve the above-described conventional problems, the thermostat of the present invention is provided with a hole larger than the differential pin shaft diameter so that the differential pin can be inserted when the lower end of the differential pin and the end surface of the differential lever are engaged. Even if the deflator performs an arc-shaped trajectory, the def pin does not operate in the same trajectory as the deflator because it has a clearance between the def pin shaft and the deflator's hole. In addition, since it moves along the through hole of the cam, it is possible to suppress changes and variations in the return-on temperature without being affected by the frictional force caused by the operation.

  In the thermostat of the present invention, after the differential pin is inserted into the differential hole, a cap larger than the diameter of the differential port is attached to a lower end portion of the differential pin, thereby allowing the differential pin and the differential to pass through the container frame and the cam. The holes can be easily assembled without detaching parts and without using a special jig or the like.

  Further, the thermostat of the present invention is such that after the differential pin is inserted into the differential hole, the lower end portion of the differential pin is formed into a larger diameter than the differential port, whereby the differential pin and the differential are formed in the through holes of the casing and the cam. In addition, the thermostat can be easily assembled without detaching parts and without using a special jig or the like, and an inexpensive thermostat can be provided without increasing the number of parts.

  Since the thermostat of the present invention has a clearance between the differential pin shaft and the hole of the differential lever, the differential pin operates vertically along the through hole of the cam. Therefore, the differential pin is connected to the differential pin engaged with the differential pin. Since the frictional force of the cam through hole is not applied, a stable return-on temperature with little variation in operation can be realized.

  In addition, the thermostat of the present invention is such that after the diff pin is inserted into the deflation hole, the lower end of the diff pin is fitted with a cap larger than the deflation hole, so that the part can be easily used without using a special jig or the like. As a result, it is possible to reduce the assembly man-hours and improve the assembly quality.

  Furthermore, the thermostat of the present invention is obtained by forming the lower end of the differential pin into a diameter larger than that of the differential port after the differential pin is inserted into the differential port, so that the part can be used without using a special jig or the like. Since it can be easily assembled and there is no increase in the number of parts, it is possible to reduce the assembly man-hours, improve the assembling quality, and realize a low-cost thermostat.

  According to the first aspect of the present invention, there is provided a substantially U-shaped container frame having a bottom portion and two opposing side surfaces, a bellows that expands and contracts by sensing a change in the internal temperature, and a lower end that contacts the bellows. Is an L-shaped lever for operating the switch part, an adjustment lever whose inclination is changed by rotation of a cam having a through hole, and the L-shaped lever and the adjustment lever are connected to counter the change of the bellows. A spring, an adjustment plate for holding a roller body, one end of which is locked to the adjustment lever and the other end of which is pivotally locked; an adjustment screw that can change a distance between the adjustment lever and the adjustment plate; , A differential pin that has a stepped portion that is inserted in the through hole of the cam, and a pivot that is pivotally supported so that one end can be rotated, and a claw that has an inclined surface that can contact the roller body at the other end And the L-shaped lever In a thermostat in which a differential arm provided with a touchable arm is arranged and an end portion of the differential pin is engaged so as to face the end surface of the differential pin, the differential pin shaft is inserted into the differential pin end surface so that the differential pin can be inserted therethrough. By providing a hole larger than the diameter and smaller than the diameter of the stepped portion of the differential pin, the differential pin has a clearance between the differential pin shaft and the hole of the deflation bar, so that the differential pin extends vertically upward along the cam through-hole. Therefore, since the friction force between the differential pin and the cam through hole is not applied to the differential lever engaged with the differential pin, it is possible to realize a stable return-on temperature with little variation in operation.

  According to a second aspect of the present invention, in the thermostat of the first aspect of the invention, after inserting the differential pin into the deflation hole, the lower end of the def pin is attached with a cap larger than the deflation hole. Can be easily assembled without using a special jig or the like, and the assembly man-hour can be reduced and the assembling quality can be improved.

  According to a third aspect of the present invention, in the thermostat of the first aspect of the invention, after the differential pin is inserted into the deflation hole, the lower end portion of the diff pin is formed into a larger diameter than the deflation hole. It is possible to easily assemble parts without using special jigs, etc., and without increasing the number of parts, it is possible to reduce assembly man-hours, improve assembly quality, and realize a low-cost thermostat. Become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the same reference numerals are given to the same configurations as those of the conventional example or the above-described embodiments, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional front view of a thermostat according to Embodiment 1 of the present invention.

  FIG. 2 is a cross-sectional view of the main part when the thermostat cap of the embodiment is mounted.

  FIG. 3 is a cross-sectional view of a main part of the thermostat of the same embodiment before differential pin molding.

  FIG. 4 is a cross-sectional view of the main part after the differential pin molding process of the thermostat of the same embodiment.

  As shown in FIGS. 1, 2, 3, and 4, 21 is a container frame, 22 is a bellows that expands and contracts by detecting the internal temperature, and a capillary tube 23 is connected to the bellows 22. Reference numeral 24 denotes an L-shaped lever that is rotatably provided by a fulcrum 24a. The lower end 24b of the L-shaped lever 24 abuts on the free end 22a of the bellows 22, and the other end 24c has a fixed contact 25. And a spacer 28 for performing a switching operation of a switch 27 for opening and closing the movable contact 26 is engaged. Further, one end of the temperature setting spring 29 is locked to the one end 24d. The other end of the temperature setting spring 29 is locked to an adjustment lever 31 via an adjustment screw 30, and the adjustment lever 31 is rotatably provided on the casing 1 by a lower fulcrum 31 a, and its upper end is a through hole 32. Is pressed against the temperature setting cam 33. Reference numeral 34 denotes an adjustment plate that holds one end of the adjustment lever 31 and the other end of the roller body 35 that is rotatably locked. The adjustment plate 34 has a gap between the adjustment lever 31 and the adjustment plate 34. An adjustment screw 36 that can be changed is held. Reference numeral 37 denotes a deflation bar rotatably provided by a fulcrum 37a, which is inserted into a through hole of the cam and engages with a differential pin 38 having a stepped portion 38a that is arranged to be movable up and down. A claw portion 37b having a sloped body capable of contacting the body 35 is provided, an arm 37c capable of contacting the lever 31 is provided at the other end, and a circular hole 37d larger than the shaft diameter of the differential pin 38 is provided at the end surface portion.

  The operation of the thermostat configured as described above will be described below.

  First, when the temperature of the temperature sensing part rises, the gas pressure in the capillary tube 23 rises and the bellows 22 is expanded. As a result, the L-shaped lever 24 rotates in the direction of arrow A about the fulcrum 24a as an axis, and counteracts the elastic force (corresponding to the set temperature) of the spring 29 set by the adjusting screw 30, and the temperature sensing unit is set. When the temperature is exceeded, the switch 27 is operated via the spacer 28, the fixed contact 25 and the movable contact 26 are turned on, and the power supply circuit is energized.

  Next, when the temperature of the temperature sensing portion decreases, the bellows 22 contracts and the lever 24 rotates in the direction of arrow B about the fulcrum 24a by the elastic force of the spring 29. At the same time, the pressing by the spacer 28 decreases and the switch 27 operates so that the fixed contact 25 and the movable contact 26 are turned off, and the power supply circuit is de-energized.

  The above is a general effect of the thermostat due to temperature. Next, the effect of operating the differential pin 38 will be described. By pressing the differential pin 38 when the switch 27 is in the ON state, the deflation bar 37 performs an arc motion counterclockwise around the fulcrum 37a against the force of the spring 29, and the arm 37c of the deflation bar 37 has an L-shape. By pushing the lever 24, the arc 27 moves counterclockwise around the fulcrum 24a of the L-shaped lever 24, so that the switch 27 is turned off via the spacer 28. At this time, the claw portion 37 b having the inclined surface of the deflation bar 37 is latched with the roller body 35 held by the adjustment plate 34 attached to the adjustment lever 31, and keeps the off state at the pressed position.

  On the other hand, when the switch 27 changes from the off state to the on state, the switch 27 is in the off state, so that the bellows 22 expands due to the temperature rise of the temperature sensing portion, and thereby the lever 24 rotates clockwise around the fulcrum 24a. Perform an arc motion. At this time, the arm 37c of the deflation bar 37 is pushed upward by the lever 24, and the deflation bar 37 moves in a circular arc clockwise. When a force exceeding the drag force of the spring 28 is applied to the latch portion, the latch is released and the diff pin 38 is While returning to the original position, the switch 27 is turned on via the spacer 28 by the rotation of the lever 24.

  As described above, in the present embodiment, the substantially U-shaped container frame having the bottom and the two opposing side surfaces, the bellows that expands and contracts by sensing the temperature change in the cabinet, and the lower end abuts on the bellows. At the other end, an L-shaped lever for operating the switch part, an adjustment lever whose inclination is changed by the rotation of a cam having a through hole, and the change of the bellows by connecting the L-shaped lever and the adjustment lever. A spring that opposes the adjusting plate, an adjustment plate that holds one end of the roller body that is locked to the adjusting lever and that is rotatably locked to the other end, and an interval between the adjusting lever and the adjusting plate that is variable. An adjustment screw, a differential pin that has a stepped portion that is inserted into the through hole of the cam, and a slope that is pivotally supported so that one end can be rotated, and that can be in contact with the roller body at the other end Said claw part and said L In a thermostat in which an arm that can come into contact with a lever of the mold is provided and the end of the differential pin is engaged with the end of the differential pin so as to face the end surface of the differential lever, the end surface of the differential member is inserted into the differential pin. Are provided with a clearance larger than the diameter of the differential pin shaft and smaller than the diameter of the stepped portion of the differential pin. By providing a clearance between the differential pin shaft and the hole of the deflation bar, the differential pin cams vertically upward. Because the friction force between the differential pin and the cam through hole is not applied to the differential lever engaged with the differential pin. An excellent thermostat can be provided.

  Further, in this embodiment, after the differential pin is inserted into the deflation hole, the lower end of the diff pin is attached with a cap larger than the deflation hole, so that the part can be easily used without using a special jig or the like. It is possible to provide an inexpensive thermostat with a small number of assembly steps.

  Further, in the present embodiment, after the differential pin is inserted into the differential hole, the lower end portion of the differential pin is formed into a diameter larger than the differential port, so that the part can be used without using a special jig or the like. It is possible to provide an inexpensive thermostat that can be easily assembled and has a small number of assembly steps and a small number of parts without increasing the number of parts.

  As described above, the thermostat according to the present invention has a clearance between the diff pin shaft and the deflation bar by providing a hole larger than the diff pin shaft and smaller than the diff pin stepped portion on the end surface portion of the def. Since the friction force of the differential pin and the through-hole of the cam is less likely to be applied to the engaging deflation bar, a stable defrosting return temperature with little temperature fluctuation is possible, so that it can be applied to applications such as refrigerators and cold storages.

Sectional front view of the thermostat in Embodiment 1 of the present invention Cross-sectional view of the main part when the thermostat cap of the embodiment is mounted Cross-sectional view of the main part of the thermostat of the same embodiment before differential pin molding processing Cross-sectional view of the main part after differential pin molding of the thermostat of the same embodiment Sectional front view of a conventional thermostat Enlarged plan view of conventional thermostat deflator Enlarged cross-sectional front view of the connecting portion between the differential pin and the deflation of a conventional thermostat

Explanation of symbols

21 Enclosure 22 Bellows 24 L-shaped lever 27 Switch 29 Spring 31 Adjustment lever 32 Cam through-hole 33 Cam 34 Adjustment plate 35 Roller body 36 Adjustment screw 37 Deflever 37a Deflever fulcrum 37b Deflever claw 37c Deflever arm 37d Circular hole of the defbre 38 diff pin 38a diff pin stepped portion 38c def pin lower end 38d cap

Claims (3)

  A substantially U-shaped container frame composed of a bottom and two opposing side surfaces, a bellows that expands and contracts by sensing a change in the internal temperature, and an L-shape that makes the lower end abut on the bellows and operates the switch at the other end Lever, an adjustment lever whose inclination is changed by rotation of a cam having a through hole, a spring which connects the L-shaped lever and the adjustment lever to counter the change of the bellows, and one end of the adjustment lever An adjustment plate that holds the roller body that is locked and pivotally locked at the other end, an adjustment screw that can change the distance between the adjustment lever and the adjustment plate, and a through hole of the cam. A differential pin having a stepped portion that is movable up and down, a claw portion that is pivotally supported so that one end can be rotated, and has a slope that can contact the roller body at the other end, and the L-shaped lever Provided arm that can contact In a thermostat in which a lever is disposed and the end of the differential pin is engaged with the end surface of the deflation bar so as to face the end surface of the deflation bar, the def pin end diameter is larger than the def pin shaft diameter so that the diff pin can be inserted, and A thermostat characterized by providing a hole smaller than the diameter of the stepped portion.   2. The thermostat according to claim 1, wherein a cap larger than the diameter of the differential lever hole is attached to a lower end portion of the differential pin after the differential pin is inserted into the differential hole.   2. The thermostat according to claim 1, wherein the lower end portion of the differential pin is formed and processed to have a diameter larger than that of the differential port after the differential pin is inserted into the differential port.

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