A snap-action dual temperature control switch
By using a design with stacked disc-shaped bimetallic strips and annular grooves, the problem of existing thermostats being unable to achieve dual temperature control is solved, enabling cost-effective dual temperature control and expanding the application environment.
Patent Information
- Application Number
- CN202010313565.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-04-20
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2040-04-20
AI Technical Summary
Existing thermostats cannot achieve dual temperature control, especially they cannot simultaneously heat to the set temperature and then maintain a stable temperature at a lower temperature. Furthermore, traditional thermostats are expensive and have limited operating environments.
A disc-shaped bimetallic strip component consisting of first and second disc-shaped bimetallic strips stacked one above the other is used to control the opening and closing of the contact switch through sudden deformation at different temperatures. Dual temperature control is achieved by combining annular grooves and insulating push rods.
It achieves the goal of first reaching the first heating temperature and then controlling the temperature to a lower temperature, thus meeting the dual temperature control requirements, reducing manufacturing costs, and expanding the application environment.
Smart Images
Figure CN111370260B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a bimetallic strip temperature control switch. Background Technology
[0002] Existing temperature control technologies that heat water to a set temperature and then maintain it at a relatively low temperature (such as boiling water and then maintaining a stable water temperature of 75-80℃) use temperature sensors and microcontrollers. The disadvantages of this technology are high manufacturing costs and, due to the large number of electronic components, significant limitations on the application environment. Traditional temperature controllers, such as snap-action temperature control switches, achieve temperature control by using a disc-shaped bimetallic strip in the heat transfer cavity of the outer shell to sense temperature and deform in the opposite direction, causing a snap-action that pushes the electrical contacts apart. This type of temperature controller can only control one temperature and therefore cannot meet the requirement of dual temperature control mentioned above. Patent CN2017100710254 discloses a temperature controller with two bimetallic strips, including a first bimetallic strip and a second bimetallic strip. A through hole is provided at the center of the second bimetallic strip. When the first and second bimetallic strips suddenly jump at high temperatures, the jumping force is transmitted to a straight rod and a П-shaped rod, respectively, so as to trigger two contact switches. The second bimetallic strip does not return to its original shape after being deformed by heat, so as to realize the safety protection after power failure due to overheating. Even if the second bimetallic strip does not jump, the first bimetallic strip can still trigger the contact switch by jumping and driving the straight rod to achieve normal temperature control. However, this patented technology can only control one temperature and cannot achieve dual temperature control, such as the dual temperature control of boiling water entering the heat preservation state. Summary of the Invention
[0003] The purpose of this invention is to provide a snap-action dual temperature control switch that can first achieve a first heating temperature and then perform temperature control at a lower temperature than the first temperature.
[0004] This invention is implemented as follows: it includes an upper base, a lower base, a disc-shaped bimetallic strip component disposed within the cavity of the upper base, a contact switch disposed within the lower base, and an insulating push rod disposed within a guide hole at the bottom of the upper base and located between the disc-shaped bimetallic strip component and the contact switch. The key feature is that the disc-shaped bimetallic strip component is composed of a first disc-shaped bimetallic strip and a second disc-shaped bimetallic strip stacked vertically. The second disc-shaped bimetallic strip has a through hole in its center with a diameter larger than that of the insulating push rod. An annular groove is provided along the inner wall of the upper base cavity, and the edge of the disc-shaped bimetallic strip component is located within the annular groove. To prevent the disc-shaped bimetallic strip component from moving up and down, the diameter of the annular groove is larger than the diameter of the disc-shaped bimetallic strip component, while the diameter of the upper base cavity is smaller than the diameter of the disc-shaped bimetallic strip component. During the heating process, the first set temperature, which is the temperature at which the first disc-shaped bimetallic strip suddenly deforms towards the insulating push rod, is lower than the second set temperature, which is the temperature at which the second disc-shaped bimetallic strip suddenly deforms towards the insulating push rod. During the cooling process, the third set temperature, which is the temperature at which the first disc-shaped bimetallic strip returns to its original shape, is higher than the fourth set temperature, which is the temperature at which the second disc-shaped bimetallic strip returns to its original shape.
[0005] In use, place the temperature measuring end at the top of the upper base against the part to be measured, and connect the two terminals of the contact switch to the power supply and the electric heating part respectively to turn on the power. When the temperature of the part to be measured rises to the first set temperature, the first disc-shaped bimetallic strip jumps suddenly, and the bulge in the direction of the temperature measuring end jumps to bulge in the direction of the second disc-shaped bimetallic strip, forming a pushing force in the direction of the insulating push rod. At this time, the second disc-shaped bimetallic strip still maintains its original shape. Under the positioning effect of the annular groove, the second disc-shaped bimetallic strip still maintains its original position under the pushing force of the first disc-shaped bimetallic strip jumping. Under the positioning effect of the annular groove, the first disc-shaped bimetallic strip cannot continue to jump to push the second disc-shaped bimetallic strip.
[0006] As heating proceeds, the temperature of the part to be measured rises. When the temperature of the part to be measured reaches the second set temperature, the second disc-shaped bimetallic strip jumps suddenly. The bulge in the direction of the measuring end jumps suddenly towards the insulating push rod. Since the insulating push rod is located at the through hole of the second disc-shaped bimetallic strip, the jump of the second disc-shaped bimetallic strip will not affect the insulating push rod. Without the constraint of the second disc-shaped bimetallic strip, the first disc-shaped bimetallic strip achieves a full jump, pushing the insulating push rod that passes through the through hole of the second disc-shaped bimetallic strip. This causes the insulating push rod to act on the contact switch, separating the two contacts of the contact switch. The electric heating part stops heating, thereby achieving the control of the first temperature.
[0007] After heating stops, the temperature of the part to be measured gradually decreases. When it drops to the third set temperature, the first disc-shaped bimetallic strip returns to its original state, and its bulge returns to the bulge towards the temperature measuring end. The second disc-shaped bimetallic strip remains in a snapped state. After the insulating push rod loses the pushing force of the first disc-shaped bimetallic strip, the two contacts of the contact switch come together again under the action of its own spring. The electric heating unit starts working again to heat the part to be measured until the temperature reaches the first set temperature. Since the second disc-shaped bimetallic strip remains in a snapped state, the first disc-shaped bimetallic strip snaps fully, causing the insulating push rod to act on the contact switch, causing the two contacts of the contact switch to separate. The electric heating unit stops heating, thus achieving the control of the second temperature (maintaining the heat preservation state).
[0008] When the power is turned off, even if the temperature of the part to be measured is lower than the third set temperature, the first disc-shaped bimetallic strip returns to its original state, closing the contact switch. The electric heating part cannot receive power, causing the temperature of the part to be measured to continue to drop. When the temperature of the part to be measured drops to the fourth set temperature, the second disc-shaped bimetallic strip returns to its original state, and its bulge returns to the bulge towards the heat-conducting outer cover.
[0009] Due to the properties of the disc bimetallic strip, the temperature reached when the disc bimetallic strip heats up and the temperature reached when it returns to its original state can be made to meet the design requirements by designing the shape of the disc bimetallic strip (the curvature of the bulge) or using different metal materials (e.g., the temperature of the first disc bimetallic strip when it heats up is 80℃ and the temperature when it returns to its original state is 75℃, while the temperature of the second disc bimetallic strip when it heats up is 100℃ and the temperature when it returns to its original state is 60℃).
[0010] The diameter of the annular groove is larger than the diameter of the disc-shaped bimetallic strip component, while the diameter of the upper base cavity is smaller than the diameter of the disc-shaped bimetallic strip component. This ensures that the disc-shaped bimetallic strip component is confined within the annular groove, while the annular groove does not restrict the sudden movement of the disc-shaped bimetallic strip component.
[0011] Compared with existing technologies, the present invention has the advantage of being able to achieve temperature control that first reaches a first heating temperature, and then perform temperature control at a lower temperature than the first temperature. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2 (AA section view);
[0013] Figure 2 This is a top view of the present invention;
[0014] Figure 3 for Figure 2 BB cross-sectional view. Detailed Implementation
[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:
[0016] like Figure 1 As shown, this embodiment includes an upper base 1, a lower base 2 fixed below the upper base, a disc-shaped bimetallic strip component a disposed within the cavity 3 of the upper base 1, a contact switch b disposed within the lower base 2, and an insulating push rod 5 disposed within the guide hole 4 at the bottom of the upper base 1 and located between the disc-shaped bimetallic strip component a and the contact switch b. In its original state, the bulging direction of the bulge of the disc-shaped bimetallic strip component a faces away from the insulating push rod 5. The contact switch b is a normally open contact switch. The notable feature is that the disc-shaped bimetallic strip component a is composed of a first disc-shaped bimetallic strip 6 and a second disc-shaped bimetallic strip 7 stacked together. The middle of the second disc-shaped bimetallic strip 7 has a diameter larger than that of the insulating push rod 5. A perforation 8 is formed in the upper base 1 cavity 3. An annular groove 9 is provided along the inner wall of the cavity 3. The edge of the disc-shaped bimetallic strip component a is located in the annular groove 9, preventing the disc-shaped bimetallic strip component a from moving up and down. The diameter of the annular groove 9 is larger than the diameter of the disc-shaped bimetallic strip component a. At the same time, the diameter of the cavity 3 of the upper base 1 is smaller than the diameter of the disc-shaped bimetallic strip component a. During the heating process, the temperature at which the first disc-shaped bimetallic strip 6 suddenly jumps and deforms towards the insulating push rod 5 is lower than the temperature at which the second disc-shaped bimetallic strip 7 suddenly jumps and deforms towards the insulating push rod 5. During the cooling process, the temperature at which the first disc-shaped bimetallic strip 6 returns to its original shape is higher than the temperature at which the second disc-shaped bimetallic strip 7 returns to its original shape.
[0017] like Figure 1 As shown, in a preferred embodiment, the upper base 1 includes a base 1a with a central concave portion and a heat-conducting outer cover 10 disposed on the base 1a. The concave portion of the base 1a forms the cavity 3 of the upper base 1. A guide hole 4 is disposed on the central axis of the base 1a. The outer edge of the upper end of the base 1a protrudes outward, and this protruding portion 1b is in the form of an annular wing. A flange 1c is provided along the periphery of the upper end surface of the base 1a. The lower base 2 is a base with a central concave cavity 2a. The outer edge of the upper end of the base 2 protrudes slightly outward to form a stop 2. b. The lower part of the base 1a is embedded in the concave cavity 2a of the base 2. The protruding part 1b of the base 1a rests against the upper end surface of the base 2. The heat-conducting outer cover 10 covers the recess of the base 1a. The lower end of the heat-conducting outer cover 10 reaches the stop 2b of the base 2 and bends towards the stop 2b, thus fixing the base 1a and the base 2 together. The space between the flange 1c provided around the upper end surface of the base 1a, the upper end surface of the base 1a, and the heat-conducting outer cover 10 forms an annular groove 9 provided along the inner side wall of the cavity 3 of the upper base 1.
[0018] like Figure 1 , 2As shown in Figure 3, in a preferred embodiment, a bracket 12 with a fixing perforation 11 is provided. The bracket 12 is sleeved on the lower base 2 and stops at the stop 2b of the base 2. In use (e.g., installed at the bottom of an electric water heater), this embodiment is fixed to the bottom of the electric water heater by screws passing through the fixing perforation 11, so that the heat-conducting outer cover 10 is close to the bottom of the water container of the electric water heater. In this way, the heat energy of the bottom of the water container can be transferred to the dish-shaped bimetallic strip component a through the heat-conducting outer cover 10.
[0019] like Figure 1 , 2 As shown in Figure 3, in a preferred embodiment, the contact switch b includes a fixed contact 14 with a terminal 13 extending out of the concave cavity 2a of the base 2, a movable contact 15 disposed below the fixed contact 14, and a U-shaped spring 17 with a terminal 16 extending out of the concave cavity 2a of the base 2, located in the concave cavity 2a of the base 2. The movable contact 15 is fixed on the free end of the U-shaped spring 17, and a protrusion 18 is provided on the movable spring 17a of the U-shaped spring 17, which rests against the rod end of the insulating push rod 5.
[0020] In use, the temperature measuring end (i.e., the heat-conducting outer cover 10) at the top of the upper base of the present invention is placed against the part to be measured (in this embodiment, the water container of an electric water heater is used), and the two terminals 13 and 16 of the contact switch b are connected to the power supply and the electric heating part (in this embodiment, the heating wire of an electric water heater is used) respectively, so that the power supply is turned on. When the temperature of the part to be measured rises to the set temperature (in this embodiment, it is set to 80°C), the first disc-shaped bimetallic strip 6 jumps, and its bulge towards the temperature measuring end jumps towards the second disc-shaped bimetallic strip 7, forming a pushing force towards the insulating push rod 5. At this time, the second disc-shaped bimetallic strip 7 still maintains its original shape. Under the positioning effect of the annular groove 9, the second disc-shaped bimetallic strip 7 jumps towards the first disc-shaped bimetallic strip 6. Under the force of the thrust, it maintains its original position. Thus, under the positioning effect of the annular groove 9, the first disc-shaped bimetallic strip 6 cannot continue to jump to push the second disc-shaped bimetallic strip 7. As heating proceeds, the temperature of the part to be measured rises. When the temperature of the part to be measured reaches the set temperature (100°C in this embodiment), the second disc-shaped bimetallic strip 7 jumps. Its bulge towards the temperature measuring end jumps towards the insulating push rod 5. Since the insulating push rod 5 is located at the through hole of the second disc-shaped bimetallic strip 7, the jump of the second disc-shaped bimetallic strip 7 will not affect the insulating push rod 5. Without the constraint of the second disc-shaped bimetallic strip 7, the first disc-shaped bimetallic strip 6 achieves a sufficient jump and pushes through the second disc-shaped bimetallic strip 7. The insulating push rod 5 through the through hole 8 acts on the contact switch b, causing the two contacts 14 and 15 of the contact switch b to separate, and the electric heating part stops heating, thus achieving the control of the first temperature. After the heating stops, the water temperature of the temperature to be measured gradually decreases. When it drops to the set temperature, the first disc-shaped bimetallic strip 6 returns to its original state, and its bulge returns to the bulge towards the temperature measuring end, while the second disc-shaped bimetallic strip 7 remains in a snapped state. After the insulating push rod 5 loses the pushing force of the first disc-shaped bimetallic strip 6, the two contacts 14 and 15 of the contact switch b, under the action of its own spring, come together again, and the electric heating part resumes operation, heating the temperature to be measured until the temperature reaches the temperature that caused the first disc-shaped bimetallic strip 6 to snap. Up to this point, since the second disc-shaped bimetallic strip 7 remains in a snapped state, the first disc-shaped bimetallic strip 6 snaps fully, causing the insulating push rod 5 to act on the contact switch b, separating the two contacts 14 and 15 of the contact switch b. The electric heating part stops heating, thus achieving the control of the second temperature (maintaining the heat preservation state). When the power is disconnected, even if the temperature of the part to be measured is lower than the set temperature, the first disc-shaped bimetallic strip 6 returns to its original state, closing the contact switch. The electric heating part cannot receive power to heat, causing the temperature of the part to be measured to continue to drop. When the temperature of the part to be measured drops to the set temperature (60°C in this embodiment), the second disc-shaped bimetallic strip 7 returns to its original state, and its bulge returns to the bulge towards the temperature measuring end.
Claims
1. A snap-action dual-temperature control switch, comprising an upper base, a lower base, a disc-shaped bimetallic strip component disposed within a cavity of the upper base, a contact switch disposed within the lower base, and an insulating push rod disposed within a guide hole at the bottom of the upper base and located between the disc-shaped bimetallic strip component and the contact switch, characterized in that... The disc-shaped bimetallic strip component consists of a first disc-shaped bimetallic strip and a second disc-shaped bimetallic strip stacked on top of each other. The second disc-shaped bimetallic strip has a through hole in the middle with a diameter larger than that of the insulating push rod. An annular groove is provided along the inner wall of the upper base cavity. The edge of the disc-shaped bimetallic strip component is located in the annular groove, preventing the disc-shaped bimetallic strip component from moving up and down. The diameter of the annular groove is larger than the diameter of the disc-shaped bimetallic strip component. At the same time, the diameter of the upper base cavity is smaller than the diameter of the disc-shaped bimetallic strip component. During the heating process, the first set temperature, which is the temperature at which the first disc-shaped bimetallic strip suddenly deforms towards the insulating push rod, is lower than the second set temperature, which is the temperature at which the second disc-shaped bimetallic strip suddenly deforms towards the insulating push rod. During the cooling process, the third set temperature, which is the temperature at which the first disc-shaped bimetallic strip returns to its original shape, is higher than the fourth set temperature, which is the temperature at which the second disc-shaped bimetallic strip returns to its original shape. In use, place the temperature measuring end at the top of the upper base against the part to be measured, and connect the two terminals of the contact switch to the power supply and the electric heating part respectively to turn on the power. When the temperature of the part to be measured rises to the first set temperature, the first disc-shaped bimetallic strip jumps suddenly, and the bulge in the direction of the temperature measuring end jumps to bulge in the direction of the second disc-shaped bimetallic strip, forming a pushing force in the direction of the insulating push rod. At this time, the second disc-shaped bimetallic strip still maintains its original shape. Under the positioning effect of the annular groove, the second disc-shaped bimetallic strip still maintains its original position under the pushing force of the first disc-shaped bimetallic strip jumping. Under the positioning effect of the annular groove, the first disc-shaped bimetallic strip cannot continue to jump to push the second disc-shaped bimetallic strip. As heating proceeds, the temperature of the part to be measured rises. When the temperature of the part to be measured reaches the second set temperature, the second disc-shaped bimetallic strip jumps suddenly. The bulge in the direction of the measuring end jumps suddenly towards the insulating push rod. Since the insulating push rod is located at the through hole of the second disc-shaped bimetallic strip, the jump of the second disc-shaped bimetallic strip will not affect the insulating push rod. Without the constraint of the second disc-shaped bimetallic strip, the first disc-shaped bimetallic strip achieves a full jump, pushing the insulating push rod that passes through the through hole of the second disc-shaped bimetallic strip. This causes the insulating push rod to act on the contact switch, separating the two contacts of the contact switch. The electric heating part stops heating, thereby achieving the control of the first temperature. After heating stops, the temperature of the part to be measured gradually decreases. When it drops to the third set temperature, the first disc-shaped bimetallic strip returns to its original state, and its bulge returns to the bulge towards the temperature measuring end. The second disc-shaped bimetallic strip remains in a snapped state. After the insulating push rod loses the pushing force of the first disc-shaped bimetallic strip, the two contacts of the contact switch come together again under the action of its own spring. The electric heating unit starts working again to heat the part to be measured until the temperature reaches the first set temperature. Since the second disc-shaped bimetallic strip remains in a snapped state, the first disc-shaped bimetallic strip snaps fully, causing the insulating push rod to act on the contact switch, causing the two contacts of the contact switch to separate. The electric heating unit stops heating, thus realizing the control of the second temperature. When the power is turned off, even if the temperature of the part to be measured is lower than the third set temperature, the first disc-shaped bimetallic strip returns to its original state, closing the contact switch. The electric heating part cannot receive power, causing the temperature of the part to be measured to continue to drop. When the temperature of the part to be measured drops to the fourth set temperature, the second disc-shaped bimetallic strip returns to its original state, and its bulge returns to the bulge in the direction of the part to be measured.
2. The snap-action dual temperature control switch according to claim 1, characterized in that... The upper base includes a centrally recessed base and a heat-conducting outer cover mounted on the base. The recessed portion of the base forms the cavity of the upper base. A guide hole is located on the central axis of the base. The outer edge of the upper end of the base protrudes outward to form a protruding part, which is an annular wing. A flange is provided along the periphery of the upper end face of the base. The lower base is a base with a centrally recessed cavity. The outer edge of the upper end of the base protrudes slightly outward to form a stop. The lower part of the base is embedded in the recessed cavity of the base. The protruding part of the base rests against the upper end face of the base. The heat-conducting outer cover covers the recess of the base. The lower end of the heat-conducting outer cover reaches the stop of the base and bends towards the stop, fixing the base and the base together. The space between the flange provided around the periphery of the upper end face of the base, the upper end face of the base, and the heat-conducting outer cover forms an annular groove provided along the inner wall of the cavity of the upper base.
3. The snap-action dual temperature control switch according to claim 1 or 2, characterized in that... The contact switch includes a fixed contact with a terminal protruding from the concave cavity of the base, a movable contact located below the fixed contact, and a U-shaped spring with a terminal protruding from the concave cavity of the base. The movable contact is fixed to the free end of the U-shaped spring. The movable spring of the U-shaped spring has a protrusion that rests against the end of the insulating push rod.
Citation Information
Patent Citations
Kick type double-temperature control switch
CN211605037U