KR810001629Y1 - Condition (temperature and pressure) responsive control switch units - Google Patents

Abstract

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Description

Decompression switch

1 is a cross-sectional view of a thermostatic pressure reducing switch device according to the present invention.

2 is a partial cross-sectional view taken along line II-II of FIG.

3 is a cross-sectional view taken along line III-III of FIG.

4 is a cross-sectional view of a variant of FIG. 1 as shown in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7 is a partial cross-sectional view of another variation of the present invention as shown in FIG.

8 is a cross-sectional view taken along line 7 of FIG.

9 is a cross-sectional view showing another variation of the present invention as in FIG.

10 is a cross-sectional view showing a modified form of the switch device shown in FIG.

The present invention relates to a temperature and pressure reduction switch. In particular, a liquid filling capsule in response to a temperature change is installed in the housing, and an actuating lever supported by a coil spring connected to a cam control device is placed in the housing so that the lever is exposed to thermal expansion of the capsule. It relates to a switch device to operate to open and close a switch.

It is an object of the present invention to provide a switch device having a simple structure and which can be used for various purposes.

The characteristics of the present invention are that the capsule and the switch are located on both sides of the lever point of the lever side, the springs are acting on the opposite side of the lever on which the switch is installed, and the cam device is installed on the housing wall on the opposite side of the capsule attached Is that it is adjustable by.

According to the present invention, since the cam fixing shaft is installed on the housing wall on the opposite side where the capsule and the switch are installed, not only the assembly is simple but also the area inside the housing can be utilized, so that the auxiliary switch or other operation device is installed without modifying the basic shape. can do.

In addition, the cam fixing shaft is preferably formed to be perpendicular to the operating lever.

According to the present invention, the ball spring is composed of a coil spring installed in parallel with the actuation lever, one end of which is suspended by the rubbing protrusion of the actuation lever and the other end of which is moved by the cam device in the longitudinal direction of the spring by the cam device. To hang.

The catch is used to adjust the spring force and the operating point of the switch, the operating temperature (or pressure) of the switch sensed by the capsule.

The term “capsule” in this text refers to a fluid-filling flexible device, such as Kellows or diaphragms, consisting of a wall that deforms with changes in internal pressure with temperature at a sensing device connected through a conduit. .

The switch device of the present invention is not only used as a temperature sensitive device but can also be used as a pressure sensing switch such as when the fluid pressure in the capsule acts as a pressure for directly operating the switch.

In order to adjust the fixed range of the cam device, it is advisable to install a screw adjustable ruler on the cam operating slider so that the spring force of the spring is adjusted independently of the cam device. The actuation lever consists of a plate body which is in contact with the opposite wall of the housing by a projection located in the middle of the connection point with the capsule and the switch.

The switch of the present invention consists of a substrate on which a snap-type switch plate having a fixed contact and a movable contact is installed, and the switch plate is connected to the actuating lever to perform a momentary opening or an instant closing operation of the switch contactor.

In the open position of the switch, the distance between the switch contacts can be adjusted by means of adjustment bolts which allow adjustment from the outside of the housing. Such adjustment bolts are used to adjust the range of temperature (or pressure range) at which the switch contacts open and close.

For example, the snap switch plate is fixed to the support of the engine so that one end is parallel to the pivot axis of the actuation lever.

In the present invention, in the case where the cam device includes a cam disk attached to a prying shaft protruding out of the housing, the auxiliary cam is installed on the coaxial shaft with the cam disk so that the auxiliary cam acts on the auxiliary switch connected to the basic switch. This auxiliary switch is mounted on an insulating board to which the basic switch is attached. The mechanism of the lever, which interlocks with the auxiliary cam, includes a bell-crank arm connected to the auxiliary cam and another arm having a hinge connected between a long installation in the housing so as to be connected to the operation portion of the auxiliary switch.

It is preferable that the crank lever and the operation be formed of synthetic resin and the hinge connection between the crank lever and the operation be configured to be flexible.

Depending on the application, an externally adjustable cam device is not required when controlling the operating point of the switch. In this case, the cam device can be distributed. Such a temperature or pressure sensitive switch device includes a housing containing a fluid-filled flexible capsule attached to the wall of the housing, an operating lever mounted on the housing to operate a switch installed in the housing in response to deformation of the capsule. Capsule and switch installed in one side, the opposite side of the capsule and the switch, the side of the operating lever is installed parallel to the lever and the coil spring connected to the lever, consisting of a ruler to adjust the end of the spring bar, the adjustable ruler Is installed on the outer wall of the housing and the actuating lever is fixed on the opposite wall of the housing to oscillate in parallel with the longitudinal axis of the coil spring.

Another lever is laid in the housing so that it can be connected to the switch-operated lever, which is held by a spring that is adjustable in resilience. The spring acting on the lever is connected at the other end with a support that allows the lever to be adjustable by the cam to predetermine the force exerted on the switch actuation lever when the lever is connected to the switch actuation lever.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to FIG. 1, the housing 1 is composed of a pressurized sheet frame 2 and a supporting plate 3 which partially closes the opening of the frame 2, and a switch assembly 5 is provided at one side of the opening of the frame 2. An opening not closed by the support plate 3 was attached and the capsule 4 filled with the fluid was fixed to the support plate 3. The suit assembly 5 will be described in more detail in FIGS. 2 and 3.

The switch device of FIGS. 1 to 3 is a temperature-sensitive switch device. The capsule 4 is formed in a bellows shape formed by forming a capsule by welding the edges of two flexible elastic metal sheets. The temperature sensing sphere (6a) installed at the sensing position is connected to the connection pipe (6). It consists of a fluid filling type in which pressure is directly transmitted in accordance with the temperature conversion of the spherical body 6a, the connecting pipe 6, and the spherical body of the capsule 4. The wall of the capsule 4 is deformed by the change of the internal pressure according to the temperature sensed by the spherical body 6a, and when the capsule 4 is deformed, the switch actuated on the axis X of the housing 1 is operated. The lever (7) was operated to activate the switch.

The plate body constituting the switch operating lever 7 has an axial protrusion 7a, and the protrusion 7a is provided with a hole forming the support shaft X of the lever 7 in the shaft wall of the housing 1. Formed.

The lever 70 has a protrusion 8 in contact with the reinforcing boss 9 welded to the center of the capsule 4, which transfers the deformation of the capsule 4 to the lever 7. On the other side of the lever 7, the projection 10 connected to the operation piece 11 of the switch plate 12, which is a part of the switch assembly, protrudes in the same direction as the projection 8. As shown in FIG.

On the surface of the lever (7) located on the opposite side of the projection (10), the rubbing projection (13) is bulged so as to lubricate the spring (14) supporting the lever (7), and the other end of the spring (14) is an adjustment bolt Connect to nut screwed on (15). The head 16 of the bolt 15 is inserted into a hole bored in the bracket 17 of the cascade 18, but can be pivotally adjusted with a through hole 19 formed in the side wall of the housing 1. The adjustment of this bolt 15 regulates the force of the lever 7 acting on the door capsule 4 to adjust the bias moment applied to the actuation lever 7.

The cam slider 18 moves along the base wall of the frame 2 but forms a flange 20 that is supported by the spring cam 14 by the elastic force of the spring 14 at the end of the cam slider 18.

The cam 21 is attached to a cam fixed shaft 22 which is pivotable to a bush 23 attached to the base wall of the housing frame 2 and the shaft 22 protrudes out of the housing 1, and the shaft 22 ), The pivot axis was horizontal with respect to the support shaft (X) of the switch operating lever (7) and the spring (14).

The lever 7 is positioned in the long hole 24 formed in the end wall of the housing 1 so that the end of the lever 7 located on the opposite side of the switch assembly is limited to the lifting operation. In the part of the adjacent Levi 7, the protrusion 25 is connected to the flange 20 connected to the cam 21 so that the OFF state by the shaft 22 is directly transmitted to the switch assembly 5. Be sure to

The switch assembly 5 constituting part of the switch device is provided independently of the switch housing 1 and includes an electrically insulating synthetic resin substrate 26. Two conductors 27 and 28 are attached to the substrate 26 and have terminals 29 and 30 that protrude out of the substrate 26.

The switch fixing contact point 31 (FIG. 3) is attached to the conductor 28 and short-circuited with the switch movable contact point 32 formed in the snap switch plate 12. As shown in FIG. The snap-shaped switch plate 12 is connected to the conductor 27 at the integral support 33 and is installed in parallel with the engine 26 and the lever 7. The switch plate 12 has two arms 34 and 35 which are connected to each other by a connecting portion 36 at opposite ends of the supporting portion 33 and has two heads to which the tongue piece 11 and the supporting portion 33 are connected. 34) A dish-shaped recess is formed at the base of the 35. In this way, when the tongue piece 11 is positioned between the fixed contact point 31 and the support bolt 38, the switch plate 12 snaps between the fixed bottom point 31 and the support bolt 38. .

The movable contact 32 is formed so as to correspond to the fixed contact 31 at the center of the connecting portion 36, so that when the switch plate 12 is deformed during operation, the contact 32 is short-circuited to the fixed contact 31.

In another form of the switch plate 12, the connection part 36 is comprised by the direct contact 32, and the square 32 body was welded to the contact 32. As shown in FIG.

According to the present invention described above, the switch plate 12 is itself conductive, so that a current flows between the two conductors 27 and 28 when the switch is closed. Even in this state, since the insulator on which the projection 10 is formed is deposited on the switch lever 7, the actuating lever 7 and its components are insulated from the current flowing through the switch assembly 5. In this case, the switch assembly 5 is generally open, and when the projection 10 presses the operating tongue 11 by the operation of the switch operating lever 7, the switch plate 12 contacts the contact 32. Falling from) indicates the resilience to recover to the original. When the force exerted on the tongue 11 by the actuation lever 7 is removed, the tongue 11 is removed from the substrate 26. When the snap action occurs again, the movable contact 32 is separated from the fixed contact 31 and the substrate 26 is removed. It comes in contact with the support bolt 38 located in the). Adjusting the support bolt 38 adjusts the spacing between the switch contacts 31 and 32 and accordingly adjusts the temperature difference detected by the spherical body 6a connected to the connecting pipe 6, that is, the temperature difference at which the switch is opened and closed. do.

By adjusting the angle of the cam fixing shaft 22, the moving distance of the cam slider 18 by the cam 21 is adjusted, so that the elastic force of the spring 14 is adjusted and accordingly the lever (7) through the capsule (4) Can regulate viral power. Since the switch operating point varies according to the fixed angle of the side 22, it is necessary to fix the angle of the shaft differently according to the temperature detected by the spherical body 6a and the pressure difference in the capsule 4.

When the bolt 15 is adjusted while the camshaft 22 is fixed, the switch is operated at a predetermined temperature and pressure sensed by the capsule 4, so when the camshaft 22 is rotated, it selects the temperature (pressure) at which the switch is operated. It becomes possible.

As shown in FIGS. 1 to 3, the switch device is closed when the temperature sensed by the capsule 4 rises to a certain level, and the compressor motor is operated. When the temperature falls below a certain level, the switch opens and moves. This is useful for refrigerators that need to stop the operation of the rotor.

The switch operates to maintain the sense temperature between the two temperatures. In this application, the camshaft 18 of the cam slider 18 is mounted so that the camshaft can be rotated between the thermo-cooled and cold-cooled fans which are attached to the cam shaft 22 by means of different switch operating mechanisms and the switch is not operated. ) Sets the knock-off point at which the projection pieces 25 of the operating lever 7 come into contact with each other.

According to FIGS. 1 to 3, the capsule 4 is attached to the support plate 3 by a method of riveting the cylindrical collar 39 welded to one side of the flexible plate, and connected to the collar 39. Connect the spherical part of (6).

The cam 21 is riveted to the inner end of the camshaft 22 and the shaft 22 is installed in the housing 1 by a bush 23 having a bevel 41 inclined inwardly with the inclined sphere 41 being the shaft. To be caught by the jaw 42 formed in (22).

4-6 show an improved version in which an additional switch is coupled to the switch assembly 5 in series with the contacts 31 and 32 to serve as an auxiliary on / off switch.

4 to 6, the auxiliary switch is composed of a leaf spring 43 having a contact 44 in contact with the fixed switch 45, and the leaf spring 43 moves in a predetermined direction by the cap 48. It was made possible to connect at the site of the point 46 and the inter-operation 47 installed in the housing 1. The operating rod 47 has a hinge connection connected to a crank lever arranged on a horizontal axis in the housing 1, and the crank lever 49 and the operating rod 47 are formed of thermoplastic synthetic resin, but the operating rod 47 and the lever 46 ) Are interconnected by a narrow portion 51 constituting a hinge connection. The end of the crank cover 49, which is not connected to the operating section 47, is in contact with the auxiliary cam 52 attached to the same camshaft 22 as the cam 21.

In such a device, when the camshaft 22 is rotated to the ＂off＂ position, the auxiliary cam 52 pushes the crank lever 49 so that the operating section 47 presses the leaf spring 43 so that the contacts 44 and 45 are rotated. Became separated.

4 to 6 is to serve to enable the function of the "off off" when the projection piece 25 of the switch operating lever 7 is cut off at the portion of the upper end 53 to prevent the "off off" action. .

In the switch device shown in FIGS. 1 to 6, the switch assembly 5 includes an auxiliary signal switch attached to a substrate 26 such as a main switch. The improved type with the attachment state of the auxiliary switch is shown.

The auxiliary signal switch includes a movable contact 954 attached to a leaf spring 55 having a horizontal groove 56 installed below the operating tongue 11 of the switch plate 12 (FIG. 7). The auxiliary switch has a fixed contact 57 connected to the terminal 57 'of the auxiliary switch, which is fixed to the upper and lower side of the movable contact 54 as shown in FIG. Short circuit was followed by opening and closing.

When the tongue piece 11 of the switch plate 12 is pressed by the action of the switch operating lever 7, the tongue piece 11 contacts the arm 56 and presses the end of the arm 56 so that the adjustment bolt 58 The low point 54 at the opposite end is connected to the fixed bottom 57 while moving to the opposite side. The contacts 54 and 57 of the auxiliary signal switch are used to monitor the operation of the main switch when the temperature rises abnormally and are adjusted by the adjusting bolt 58 to operate outside the normal operating range of the main switch.

In the case of the refrigerator, the auxiliary signal switch is used when the low points 31 and 32 are connected so that the constant temperature adjustment of the main switch is made accurately and the function of the compressor is stopped or the compressor malfunctions. In other words, if the detected temperature increases because the compressor fails to function, the tongue piece 11 is coupled with the arm 56 and the auxiliary switch operates. For example, when the auxiliary auxiliary switch position low point 54, 57 is connected to a circuit including a supervisory lamp so as to be opened and closed, the supervisory lamp is turned on when the auxiliary signal is operated, and the auxiliary switches 54 and 57 are closed. If connected, the monitoring light circuit is opened and closed when the auxiliary signal switch is operated.

Such a switch device is suitable for the control of the refrigerator, which automatically controls the periodic operation of the compressor motor so that the refrigerator is kept within a predetermined temperature range. In this case, the temperature selection cam 21 and the shaft 22 associated therewith are omitted, and the bolt 15 for adjusting the spring 14 is omitted. It can be connected directly to the frame (2).

In two-door refrigerators with two evaporators used for refrigerating and freezing, it is common to ensure that the operating cycle of the compressor follows the automatic thawing cycle of the evaporator located in the refrigerating chamber while the freezing chamber evaporator is operating. In this case, the control switch shall be closed at a temperature above the boiling point and the freezer shall open at a suitable temperature for the preservation of the frozen food. The temperature at which the switch opens can be selected within certain limits, allowing the thawing cycle to be maintained while keeping the temperature at which the switch closes.

9 shows a modification of the switch device according to the present invention to meet the above object.

According to FIG. 9, in addition to the apparatus shown in FIG. 1, a leaf spring 59 is mounted, one end of which is fixed to the housing 1 and the other end of which is pressed against the projection 60 of the lever 7, which spring Numeral 59 is an elastic force acting in the same direction as the spring 14.

In addition, the adjustment bolt 15 for locking the ball spring (140) is supported by the through hole 19 of the housing (1) and the elastic force of the spring 14 is adjustable by the cam shaft (22).

Therefore, when the pressure of the capsule 4 increases with the sensed temperature increase, the temperature at which the switch is operated by the lever 7 is always constant, which indicates a desired opening condition.

In order to change the closing temperature, the N-shaped lever 61 is connected to the frame 2 of the switch housing 62. The lever 61 has one end connected to the lever 61 and the other end of the cam slider 18 It is forced in the opposite direction of the clock hands by the spring 63 fixed to the bolt 64 in the bracket (17) of () (see Fig. 9).

The lever 61 has a protruding arm 65 connected to the fixed support protrusion 66 in the housing and a bent portion 67 connected to the switch-operated lever 7, as shown in FIG. 9. The projection 66 is not connected to the lever 7 during the operation of the switch closure in which the lever 7 rotates clockwise. The support projection 66 is connected to the bent portion 67 of the lever 7 and the lever 61 by the spring 63 before the switch operation lever 7 rotates counterclockwise and the switch 5 is opened. Install in a position to show force. As a result, the opening point of the switch is determined by the spring force of the spring 63 and the angle of the camshaft 22.

FIG. 9 is similar to the apparatus of FIG. 1 allowing the switch to be closed in accordance with the angle of the camshaft 22. In the apparatus of FIG. 9, the cam 68 is attached to the camshaft 22. The cam 68 is provided with a lever so that the switch can be opened even when the camshaft 22 is in the " off " position. It is connected with the projection piece 25 of 7).

10 to 10 show a switch device similar to that of FIG. 9, so that a separate turn-off switch as described in FIGS. 4 to 6 is operated by the auxiliary cam 52 built into the cam shaft 22. FIG. It is provided and the other part is like FIG.

In order to change the point at which the switch is opened, the spring 14 is hung on the cam slider 18 in a manner similar to that of the spring 63 as described in FIGS. 1 to 4.

In addition, the spring 63 can be hung on the frame 2, and the spring 14 can be hung on the cam slider 18. In this case, the switch device is similar to that of FIG. Pressure) (the difference is wider).

In order not to be influenced by unnecessary surroundings, it is necessary to install a heater in the cap shoe 4 so that the capsule 4 maintains a constant temperature. Such a bellows type heater 69 is indicated by a dotted line in FIG. It was. The heater consists of a thermal resistor connected between the switch terminals 31 and 32 in parallel with the switch contacts 31 and 32 so that a current flows when the switch contact is closed. Have a short when open. The eater 69 is generally installed in the switch assembly 5 but in a position close to the capsule 4 in order to obtain an optimal heating effect as a low output heater.

Claims (1)

Fluid filled flexible capsule installed in the housing, actuated lever built in the housing to actuate the switch installed in the housing in response to the deformation of the capsule, coil spring mounted in the housing to act on the actuated lever, acted by the capsule It is composed of an adjustment device such as a cam that adjusts the spring force so that the operating point of the switch can be preset in response to the deformation of the spring and the capsule to give the force to the lever on the opposite side. In the switch 5 being positioned on the dole side of the actuating lever 7 on both sides of the support shaft of the lever, the switch fixing contact 31 and the actuating lever having the switch 5 attached to the insulating substrate 26. It consists of a snap-type switch plate 12 fixed to the substrate 26 and a movable contact 32 mounted on the switch plate 12 so as to be connected to the fixed contact point 31 in parallel to the (7). 12) directly on the operating lever (7). A thermostatic pressure reducing switch, characterized in that connected to open and close the switch contact.