CN107647770B - Overvoltage protection switch and pressure appliance with same - Google Patents
Overvoltage protection switch and pressure appliance with same Download PDFInfo
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- CN107647770B CN107647770B CN201610600181.0A CN201610600181A CN107647770B CN 107647770 B CN107647770 B CN 107647770B CN 201610600181 A CN201610600181 A CN 201610600181A CN 107647770 B CN107647770 B CN 107647770B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/09—Safety devices
Abstract
The invention discloses an overvoltage protection switch and a pressure appliance, wherein the overvoltage protection switch comprises: the switch comprises a first switch terminal, a second switch terminal, a trigger holder, a touch device, a switch body and a sealing device, wherein the first switch terminal is provided with a first contact; the second switch terminal has a second contact; the trigger holder includes a trigger connected to a sidewall of the opening adjacent the first end of the second switch terminal and an elastic holder connected between a free end of the trigger and the second end of the second switch terminal; the sealing device is configured to drive the trigger device to trigger the trigger piece when environmental pressure applied by the communication port reaches a preset pressure, so that the elastic retaining piece always pulls the second end of the second switch terminal towards a direction away from the second contact point, the second contact point moves from the contact position to the disconnection position, and the second contact point is kept at the disconnection position. According to the overvoltage protection switch disclosed by the invention, power-off protection under abnormal overvoltage is realized.
Description
Technical Field
The invention relates to the field of household appliances, in particular to an overvoltage protection switch and a pressure appliance with the same.
Background
In the related art, the normal pressure use range of the electric pressure cooker is 70kPa (kilopascal). In the normal use process of the electric pressure cooker, the normal pressure relief is usually realized by adopting a pressure relief valve or a leak between the cooker body and the cover body of the electric pressure cooker (at the moment, the electric pressure cooker is an elastic pressure cooker). However, when the pressure release valve fails or the normal leak between the pot body and the cover body cannot be formed to discharge the gas in the electric pressure cooker, the electric pressure cooker is easy to explode, and therefore, the user is injured.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to provide an overvoltage protection switch which is simple in construction.
Another object of the invention is to propose a pressure appliance with an overvoltage protection switch as described above.
An overvoltage protection switch according to a first aspect of the invention comprises: a first switch terminal having a first contact; a second switch terminal, a first end of which is a fixed end and a second end of which is a movable end, the second end of which is provided with a second contact that is in constant contact with the first contact, and a through opening is arranged between the first end and the second end of the second switch terminal; a trigger holder provided on the second switch terminal, the trigger holder including a trigger connected to a sidewall of the opening adjacent to a first end of the second switch terminal and an elastic holder connected between a free end of the trigger and a second end of the second switch terminal; the touch device is arranged adjacent to the second switch terminal; the switch comprises a switch body, a first switch terminal, a second switch terminal, a trigger holder and a trigger device, wherein a communication port communicated with the external environment is formed in the switch body; the sealing device is arranged in the switch body and connected with the trigger device, and the sealing device drives the trigger device to trigger the trigger piece through the sealing device when environmental pressure applied by the communication port reaches a preset pressure, so that the elastic holding piece always pulls the second end of the second switch terminal towards a direction away from the second contact point, the second contact point moves from a contact position in constant contact with the first contact point to a disconnection position separated from the first contact point, and the second contact point is kept at the disconnection position.
The overvoltage protection switch disclosed by the invention is simple in structure and low in cost. When the overvoltage protection switch is used for a pressure appliance such as an electric pressure cooker, the first contact and the second contact are disconnected by arranging the touch device and the trigger holder when the pressure in the pressure appliance reaches a preset pressure, so that a heating circuit with the first switch terminal and the second switch terminal of the pressure appliance can be disconnected, the power-off protection under abnormal overvoltage can be effectively realized, in addition, the second contact can be kept at the disconnected position when the second contact is positioned at the disconnected position, the situation that the heating device continues to heat cannot occur, and the use safety of the pressure appliance is improved. In addition, through setting up the switch body, can be with first switch terminal, second switch terminal, trigger keeper, trigger device and sealing device integration in the switch body for overvoltage protection switch is an integral part, and during the use, can conveniently and swiftly install overvoltage protection switch to pressure utensil, has improved assembly efficiency. By arranging the sealing device, the reliability of the action of the overvoltage protection switch can be effectively ensured.
According to some embodiments of the present invention, the trigger is a spring, the trigger and the elastic holder are located on a side of the second switch terminal adjacent to the activating device when the second contact is located at the contact position, and the trigger and the elastic holder are located on a side of the second switch terminal away from the activating device when the second contact is located at the off position.
Optionally, the resilient tab is formed as a planar structure.
Optionally, the resilient retainer is a compression spring.
According to some embodiments of the invention, the actuation means comprises: the touch fixing seat is provided with a guide hole, and the first switch terminal and the second switch terminal are fixed on the touch fixing seat; the touch rod is arranged in the guide hole, the first end of the touch rod is suitable for extending out of the guide hole to touch the trigger retaining piece, and the second end of the touch rod is connected with the sealing device; and the elastic resetting piece is arranged in the guide hole, and the elastic resetting piece is constructed to normally push the touch rod towards the direction far away from the second switch terminal.
Alternatively, the sealing means is a sealing sheet, and the sealing means bulges toward the communication opening to close the communication opening when the second contact point is located at the contact position, and bulges in a direction away from the communication opening when the second contact point is located at the disconnection position.
Optionally, the predetermined pressure is P, which satisfies: p is more than or equal to 140kPa and less than or equal to 200 kPa.
Optionally, the pressure-bearing area of the environment pressure acting on the sealing device is S, where S satisfies: 1mm2≤S≤100mm2。
A pressure appliance according to a second aspect of the present invention comprises: an appliance body; and an overpressure protection switch according to the above first aspect of the invention, the overpressure protection switch being provided on the appliance body, wherein the ambient pressure is a pressure within the appliance body, and the triggering device is moved upwards to trigger the trigger holder when the pressure within the appliance body reaches the predetermined pressure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a cross-sectional view of an overvoltage protection switch according to an embodiment of the invention, with the second contact in the contact position;
fig. 2 is another cross-sectional view of an overvoltage protection switch in accordance with an embodiment of the invention, with the second contact in the open position;
fig. 3 is a perspective view of an overvoltage protection switch according to an embodiment of the invention, with the second contact in the contact position;
FIG. 4 is a schematic diagram of the first and second switch terminals shown in FIG. 3;
fig. 5 is a cross-sectional view of a pressure appliance according to an embodiment of the invention.
Reference numerals:
100: an overvoltage protection switch;
1: a first switch terminal; 11: a first contact;
2: a second switch terminal; 21: a second contact; 22: an opening;
3: triggering the retainer; 31: a trigger; 32: an elastic holder;
41: touching the fixed seat; 411: a guide hole; 42: a touch rod is touched; 43: an elastic reset member;
5: a switch body; 51: a communication port; 6: a sealing device; 7: a wire;
200: a pressure implement;
201: a pan body; 202: a cover body; 203: and a seal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An overvoltage protection switch 100 according to an embodiment of the invention is described below with reference to fig. 1-5. The overvoltage protection switch 100 can be used in a pressure appliance 200 requiring pressure power-off protection, such as an electric pressure cooker, especially a rigid pressure cooker (i.e., the cooker body and the cover are always kept in a completely sealed state during the whole operation of the electric pressure cooker). When the pressure appliance 200, such as a normal pressure relief device of an electric pressure cooker, such as a pressure relief valve, fails and an abnormal overpressure occurs (i.e. the pressure in the pressure appliance 200 is greater than its normal pressure use range, such as 70kPa), the overpressure protection switch 100 can power off the heating device in the pressure appliance 200, so that the heating device stops heating, and the pressure in the pressure appliance 200 is prevented from further increasing. In the following description of the present application, the overvoltage protection switch 100 is used in an electric pressure cooker as an example. Of course, it will be understood by those skilled in the art that the over-pressure protection switch 100 may also be used in other pressure appliances 200, such as electric pressure cookers, and the like.
As shown in fig. 1 and 2, the overvoltage protection switch 100 according to the embodiment of the first aspect of the present invention includes a first switch terminal 1, a second switch terminal 2, a trigger holder 3, a triggering device, a switch body 5 and a sealing device 6.
The first switch terminal 1 has a first contact 11 and the second switch terminal 2 has a second contact 21, the second contact 21 being in constant contact with the first contact 11. For example, as shown in fig. 1 and 2, a first contact 11 is provided at a free end (e.g., an upper end in fig. 1 and 2) of the first switch terminal 1, the first contact 11 is formed to protrude from one side surface of the first switch terminal 1, and similarly, a second contact 21 is provided at a free end (e.g., a right end in fig. 1 and 2) of the second switch terminal 2, the second contact 21 is formed to protrude from one side surface of the second switch terminal 2.
The first switch terminal 1 and the second switch terminal 2 are adapted to be connected (e.g. by means of wires 7) in a heating circuit (not shown in the figures) of a pressure appliance 200, such as an electric pressure cooker, said heating circuit comprising heating means. When the pressure appliance 200, such as an electric pressure cooker, is normally used, the first contact 11 and the second contact 21 are always kept in contact, the heating circuit is always conducted, and the heating device is operated to heat food and the like in the pressure appliance 200.
Alternatively, the outer surfaces of the first contact 11 and the second contact 21 may be respectively formed by an arc surface and a plane, and the plane is located at the top of the first contact 11 and the second contact 21, so that the contact area is large because the contact between the first contact 11 and the second contact 21 is a surface contact, the first contact 11 and the second contact 21 are in good contact, and the reliability of the heating circuit is ensured. Of course, the outer surfaces of the first contact 11 and the second contact 21 may be formed as spherical surfaces (not shown) that protrude outward.
As shown in fig. 1 and 2, the first end of the second switch terminal 2 (for example, the left end in fig. 1 and 2) is a fixed end, and at this time, the first end of the second switch terminal 2 is fixed, the first end of the second switch terminal 2 does not move relative to the overvoltage protection switch 100, the second end of the second switch terminal 2 (for example, the right end in fig. 1 and 2) is an active end, and the second end of the second switch terminal 2 is movable. The second contact 21 is disposed at the second end of the second switch terminal 2, so that the second end of the second switch terminal 2 can drive the second contact 21 to move, so that the second contact 21 contacts with the first contact 11, or separates from the first contact 11. A through opening 22 is provided between the first end of the second switch terminal 2 and the second end of the second switch terminal 2. For example, as shown in fig. 3 and 4, the opening 22 penetrates the second switch terminal 2 in the thickness direction of the second switch terminal 2. It will be appreciated that the particular size, shape, etc. of the opening 22 may be specifically configured according to actual requirements to better meet the actual requirements.
The triggering device is arranged adjacent to the second switch terminal 2. For example, as shown in fig. 1 and 2, the touching means is located on a side (e.g., a lower side in fig. 1 and 2) of the second switch terminal 2 remote from the first switch terminal 1. The triggering device is not in contact with the trigger holder 3 under normal conditions (for example, when the second contact 21 is in the contact position). The triggering device is configured such that when the ambient pressure reaches a predetermined pressure, triggering the trigger holder 3 moves the second contact 21 from a contact position (shown in fig. 1) in which it is normally in contact with the first contact 11 to an open position (shown in fig. 2) in which it is separated from the first contact 11. It should be noted that when the overvoltage protection switch 100 is used in a pressure appliance 200, such as an electric pressure cooker, the "ambient pressure" can be understood as the pressure in the pressure appliance 200, such as an electric pressure cooker.
For example, when the pressure in the pressure appliance 200, such as an electric pressure cooker, reaches a predetermined pressure, the touching device contacts the trigger holder 3 and touches the trigger holder 3 to separate (i.e., not contact) the second contact 21 from the first contact 11, thereby disconnecting the heating circuit, the heating device does not work, the pressure in the pressure appliance 200, such as an electric pressure cooker, can be gradually reduced, thereby protecting the pressure appliance 200, such as an electric pressure cooker, and the user cannot be injured because the pressure appliance 200, such as an electric pressure cooker, does not discharge high-temperature and high-pressure gas. The triggering device may not contact the trigger holder 3 after triggering the trigger holder 3.
As shown in fig. 1 to 4, the trigger holder 3 includes a trigger 31 and an elastic holder 32, and the trigger 31 is connected to a sidewall (e.g., a left sidewall in fig. 1 to 4) of the opening 22 adjacent to the first end of the second switch terminal 2, which is preferably formed in a linear shape to ensure reliability of connection of the trigger 31 to the sidewall. The rest of the trigger 31 and the rest of the side wall of the opening 22 are spaced apart from each other, and in this case, the trigger 31 corresponds to a cantilever beam, and a free end (e.g., a right end in fig. 1 to 4) of the trigger 31 is swingable with respect to the other end (e.g., a left end in fig. 1 to 4) of the trigger 31 opposite to the free end.
The elastic holder 32 is connected between the free end of the trigger 31 and the second end of the second switch terminal 2 (for example, the sidewall of the opening 22 adjacent to the second end of the second switch terminal 2), when the pressure in the pressure appliance 200, such as an electric pressure cooker, reaches a predetermined pressure, the trigger 31 is triggered by the trigger device to make the elastic holder 32 pull the second end of the second switch terminal 2 towards the direction away from the second contact 21 so as to make the second contact 21 move from the contact position normally contacting with the first contact 11 to the off position separated from the first contact 11 and make the second contact 21 keep in the off position, as shown in fig. 2. Alternatively, the elastic holder 32 is a compression spring, for example, as shown in fig. 1 to 4, the elastic holder 32 may be a variable diameter coil spring having a smaller cross-sectional area at both ends and a larger cross-sectional area at the middle. But is not limited thereto.
Thus, as shown in fig. 1, when the second contact 21 is located at the contact position, the trigger 31 and the compression spring are both located at the lower side of the second switch terminal 2, and since the compression spring is in a normal compression state, the outer edge of the second end of the second switch terminal 2 will be normally upward under the pulling force of the compression spring, so that the first contact 11 is in good contact with the second contact 21; when the second contact 21 is located at the off position, the trigger 31 and the compression spring move upward from the position shown in fig. 1 to the upper side of the second switch terminal 2, and since the compression spring is in a normal compression state, the outer edge of the second end of the second switch terminal 2 will be normally downward under the pulling force of the compression spring, so that the second contact 21 is normally separated from the first contact 11, and the second contact 21 will not be contacted with the first contact 11 again.
Optionally, the predetermined pressure is P, P satisfying: p is more than or equal to 140kPa and less than or equal to 200 kPa. The specific value thereof may be specifically set according to the type of the actual pressure appliance 200, such as an electric pressure cooker, to better meet the actual requirements.
Wherein the trigger holder 3 is provided on the second switch terminal 2, and the trigger holder 3 holds the second contact 21 in the off position when the second contact 21 is in the off position. For example, the overvoltage protection switch 100 cannot be reset after one use (the first contact 11 and the second contact 21 are disconnected), that is, the first contact 11 and the second contact 21 do not contact again to conduct the heating circuit, thereby increasing the safety of the pressure appliance 200, such as an electric pressure cooker.
The switch body 5 is formed with a communication port 51 communicating with the external environment, and for example, as shown in fig. 1 and 2, the communication port 51 may be formed at the bottom of the switch body 5. When the overvoltage protection switch 100 is used in a pressure appliance 200 such as an electric pressure cooker, the "external environment" refers to the interior of the pressure appliance 200 such as an electric pressure cooker. Wherein the first switch terminal 1, the second switch terminal 2, the trigger holder 3 and the triggering device are all arranged in the switch body 5. Thus, by providing the switch body 5 that can accommodate the first switch terminal 1, the second switch terminal 2, the trigger holder 3, and the trip device, the integration of the overvoltage protection switch 100 is improved.
The sealing device 6 is arranged in the switch body 5, the sealing device 6 is connected with the trigger device, and the sealing device 6 is configured that when the environmental pressure applied through the communication port 51 reaches a preset pressure, the sealing device 6 drives the trigger device to trigger the trigger piece 31, so that the elastic holding piece 3 constantly pulls the second end of the second switch terminal 2 in a direction away from the second contact 21, the second contact 21 moves from a contact position constantly contacting with the first contact 11 to a disconnection position separated from the first contact 11, and the second contact 21 is kept at the disconnection position. Therefore, by providing the sealing device 6, the sealing device 6 can isolate the inside of the switch body 5 from the inside of the pressure appliance 200, such as an electric pressure cooker, so that a pressure difference exists between the inside of the switch body 5 and the inside of the pressure appliance 200, such as an electric pressure cooker, and therefore, when the inside of the pressure appliance 200, such as an electric pressure cooker, is abnormally over-pressurized, the sealing device 6 can push the trigger device to trigger the trigger piece 31 under the action of the pressure difference.
The overvoltage protection switch 100 according to the embodiment of the invention has the advantages of simple structure and low cost. When the overvoltage protection switch 100 is used for a pressure appliance 200 such as an electric pressure cooker, the first contact 11 and the second contact 21 are disconnected by arranging the trigger device and the trigger holder 3, when the pressure in the pressure appliance 200 such as the electric pressure cooker reaches a preset pressure, the heating circuit with the first switch terminal 1 and the second switch terminal 2 of the pressure appliance 200 such as the electric pressure cooker can be disconnected, so that the power-off protection under abnormal overvoltage can be effectively realized, and the second contact 21 can be kept at the disconnected position when the second contact 21 is positioned at the disconnected position, the situation that the heating device continues to heat is avoided, and the use safety of the pressure appliance 200 such as the electric pressure cooker is improved. In addition, by arranging the switch body 5, the first switch terminal 1, the second switch terminal 2, the trigger holder 3, the trigger device and the sealing device 6 can be integrated in the switch body 5, so that the overvoltage protection switch 100 is an integral component, and when in use, the overvoltage protection switch 100 can be conveniently and quickly mounted on a pressure appliance 200, such as an electric pressure cooker, and the assembly efficiency is improved. By arranging the sealing device 6, the reliability of the action of the overvoltage protection switch 100 can be effectively ensured.
Further, referring to fig. 1 to 4, the trigger 31 is a spring, the trigger 31 and the elastic holder 32 are located on a side (e.g., a lower side in fig. 1 and 2) of the second switch terminal 2 adjacent to the triggering device when the second contact 21 is located at the contact position, and the trigger 31 and the elastic holder 32 are located on a side (e.g., an upper side in fig. 1 and 2) of the second switch terminal 2 away from the triggering device when the second contact 21 is located at the open position. Alternatively, the elastic sheet is formed in a planar structure, and thus, the processing is simple and the cost is low, but not limited thereto.
According to some embodiments of the present invention, as shown in fig. 1 and 2, the triggering device is located on a side of the second switch terminal 2 (e.g., a lower side in fig. 1 and 2) away from the first switch terminal 1, and specifically, the triggering device includes: the touch fixing base 41, the touch rod 42 and the elastic reset piece 43, a guide hole 411 is formed on the touch fixing base 41, wherein the first switch terminal 1 and the second switch terminal 2 are fixed on the touch fixing base 41. The touch bar 42 is disposed in the guide hole 411, a first end (e.g., an upper end in fig. 1 and 2) of the touch bar 42 is adapted to extend out of the guide hole 411 to touch the trigger holder 3, and the guide hole 411 has a guiding effect on the touch bar 42 to ensure the accuracy of the movement of the touch bar 42. Alternatively, the extension direction of the trip lever 42 is perpendicular to the plane of the second switch terminal 2, whereby the trip holder 3 can be tripped better to separate the second contact 21 from the first contact 11. The lower end of the touch lever 42 is provided with a stopper rib extending outward.
The elastic restoring member 43 is disposed in the guide hole 411, and the elastic restoring member 43 is configured to normally push the trip lever 42 toward a direction away from the second switch terminal 2. For example, the elastic restoring member 43 may be a spring, the spring is sleeved outside the touch lever 42, and two ends of the spring respectively abut against the top wall of the guiding hole 411 and the stopping rib, so as to normally push the touch lever 42 downwards, i.e. when the pressure in the pressure appliance 200, such as an electric pressure cooker, is less than a predetermined pressure, the touch lever 42 can be restored under the action of the spring.
Wherein a second end (e.g., the lower end in fig. 1 and 2) of the trip rod 42 is connected to the sealing device 6. For example, as shown in fig. 1 and 2, the sealing device 6 is formed with a receiving groove in which the second end of the trip rod 42 is adapted to be fixed. The sealing device 6 is configured such that when the ambient pressure applied through the communication port 51 (e.g., the internal pressure of the pressure appliance 200 such as an electric pressure cooker) reaches a predetermined pressure, the sealing device 6 drives the first end of the activating rod 42 to protrude out of the guide hole 411 to activate the trigger holder 3. The sealing means 6 is used to isolate the interior of the switch body 5 from the communication opening 51, for example, from the interior of a pressure appliance 200, such as an electric pressure cooker, so that there is a pressure difference between the interior of the switch body 5 and the interior of the pressure appliance 200, such as an electric pressure cooker, so that when the interior of the pressure appliance 200, such as an electric pressure cooker, is abnormally over-pressurized, the sealing means 6 can push the trigger rod 42 upward to trigger the trigger holder 3 under the action of the pressure difference.
Alternatively, the sealing device 6 is a sealing sheet, and when the second contact 21 is located at the contact position, the sealing device 6 bulges towards the communication opening 51 to close the communication opening 51, for example, as shown in fig. 1, the edge of the sealing sheet and the bottom for closing the communication opening 51 play a role of two-layer sealing, which effectively ensures the reliability of the action of the touch device. The sealing device 6 bulges out in a direction away from the communication opening 51 when the second contact 21 is in the open position (as shown in fig. 2). In this case, the sealing device 6 may be made of a material having elasticity, so that the sealing effect of the sealing device 6 can be further improved.
According to the overvoltage protection switch 100 provided by the embodiment of the invention, when the pressure in a pressure appliance 200 such as an electric pressure cooker is between 140kPa and 200kPa, the power supply is cut off, and the overvoltage protection is realized. The principle of the overvoltage protection switch 100 is that steam in a pressure appliance 200 such as an electric pressure cooker enters a switch body 5 through a communication port 51, when the steam pressure is larger than the elastic force of an elastic reset piece 43 such as a spring, the steam pushes open a sealing device 6 to drive a touch rod 42 to move, a touch trigger retaining piece 3 is triggered, the touch trigger retaining piece 3 is upwards flicked after being stressed, so that a second contact 21 of a second switch terminal 2 moves downwards along with the touch trigger retaining piece 3, a first contact 11 and a second contact 21 in the switch body 5 are separated, and after a trigger piece 31 is triggered, the elastic retaining piece 32 such as a compression spring pulls the second switch terminal 2 to prevent the second contact 21 from returning, so that the pressure protection can be effectively increased, the safety of the pressure appliance 200 such as an electric pressure cooker is increased, and compared with a traditional mechanical pressure relief structure, the overvoltage protection switch is safer and more reliable.
As shown in fig. 5, a pressure appliance 200, such as an electric pressure cooker, according to an embodiment of the second aspect of the present invention includes an appliance body and an overvoltage protection switch 100. Wherein the overvoltage protection switch 100 is an overvoltage protection switch 100 according to the above-described first aspect of the invention.
Specifically, the overpressure protection switch 100 is disposed on the appliance body, wherein the ambient pressure is the pressure in the appliance body, and the triggering device moves upward to trigger the trigger holder 3 when the pressure in the appliance body reaches a predetermined pressure. For example, as shown in fig. 5, the device body comprises a pot 201 and a cover 202, wherein the top of the pot 201 is open, the cover 202 is covered on the top of the pot 201, and the overvoltage protection switch 100 is disposed on the cover 202 and located at the center of the cover 202. Further, the overpressure protection switch 100 is vertically arranged, at this time, the communication port 51 can be directly communicated with the inside of the pot body 201, and the pressure in the pot body 201 can directly act on the bottom of the triggering device through the communication port 51. A sealing member 203 is arranged between the pan body 201 and the cover 202 to ensure the sealing property between the pan body 201 and the cover 202.
When the pressure in the appliance body has just reached the predetermined pressure, there are:
F1＝F2+G＝P×S
wherein, F1 is the pressure to which the bottom of the sealing device 6 is subjected; f2 is the elastic force of the elastic restoring member 43; g is the dead weight of the actuating mechanisms such as the ejector rod, the elastic reset piece 43 and the like; p is the pressure in the appliance body, and the value range of P is 120kPa-200kPa (including end points); s is a pressure receiving area of the ambient pressure acting on the sealing device 6 (for example, as shown in fig. 5, S is a pressure receiving area of the pressure in the appliance body acting on the bottom of the sealing device 6), and is an area size of a contact point between the steam and the received force.
Therefore, the stress of the elastic reset piece 43 for controlling the power-off pressure can be obtained through conversion of the values.
Specifically, when the second switch terminal 2 is operated, the force F1 applied to the bottom of the sealing device 6 is P × S, and F1 is F2+ G. The force of the elastic return element 43 controlling the switching-off pressure can thus be derived by conversion of the above formula. For example, when S is in the range of 1mm2-100mm2(including the endpoints) F1 ranges from 0.1N to 20N, which is a preferred choice for the force applied by the resilient return element 43.
According to the pressure appliance 200, such as an electric pressure cooker, provided by the embodiment of the invention, abnormal pressure power-off protection can be effectively provided, and the cost is reduced.
Other constructions and operations of the pressure appliance 200 according to embodiments of the present invention, such as an electric pressure cooker, are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. An overvoltage protection switch, comprising:
a first switch terminal having a first contact;
a second switch terminal, a first end of which is a fixed end and a second end of which is a movable end, the second end of which is provided with a second contact that is in constant contact with the first contact, and a through opening is arranged between the first end and the second end of the second switch terminal;
a trigger holder provided on the second switch terminal, the trigger holder including a trigger connected to a sidewall of the opening adjacent to a first end of the second switch terminal and an elastic holder connected between a free end of the trigger and a second end of the second switch terminal;
the touch device is arranged adjacent to the second switch terminal;
the switch comprises a switch body, a first switch terminal, a second switch terminal, a trigger holder and a trigger device, wherein a communication port communicated with the external environment is formed in the switch body;
the sealing device is arranged in the switch body and connected with the trigger device, the sealing device drives the trigger device to trigger the trigger device through the sealing device when environmental pressure applied by the communication port reaches a preset pressure, so that the elastic retaining piece normally pulls the second end of the second switch terminal towards a direction away from the second contact point, the second contact point moves from a contact position normally contacted with the first contact point to a disconnection position separated from the first contact point, the second contact point is kept at the disconnection position, the sealing device is a sealing piece, and when the second contact point is located at the contact position, the sealing device bulges towards the communication port to seal the communication port.
2. The overvoltage protection switch of claim 1, wherein said trigger member is a spring, said trigger member and said resilient retention member are located on a side of said second switch terminal adjacent to said trigger when said second contact is in said contact position, and said trigger member and said resilient retention member are located on a side of said second switch terminal away from said trigger when said second contact is in said open position.
3. The overvoltage protection switch of claim 2, wherein the spring is formed as a planar structure.
4. The overvoltage protection switch of claim 1, wherein the resilient retainer is a compression spring.
5. The overvoltage protection switch according to any one of claims 1-4, wherein the trip device comprises:
the touch fixing seat is provided with a guide hole, and the first switch terminal and the second switch terminal are fixed on the touch fixing seat;
the touch rod is arranged in the guide hole, the first end of the touch rod is suitable for extending out of the guide hole to touch the trigger retaining piece, and the second end of the touch rod is connected with the sealing device; and
elasticity resets and establishes in the guiding hole, elasticity resets and constructs into towards keeping away from the direction of second switch terminal often promotes the trip arm.
6. The overvoltage protection switch of claim 1, wherein the sealing means bulges away from the communication opening when the second contact is in the open position.
7. The overvoltage protection switch of claim 1, wherein the predetermined pressure is P, and wherein P satisfies: p is more than or equal to 140kPa and less than or equal to 200 kPa.
8. The overvoltage protection switch of claim 1, wherein the ambient pressure acts onThe pressure force bearing area on the sealing device is S, wherein S satisfies: 1mm2≤S≤100mm2。
9. A pressure implement, comprising:
an appliance body; and
the over-pressure protection switch according to any of claims 1-8, provided on the appliance body, wherein the ambient pressure is a pressure within the appliance body, the activating means moving upwards to activate the trigger holder when the pressure within the appliance body reaches the predetermined pressure.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610600181.0A CN107647770B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
| PCT/CN2016/095335 WO2018018670A1 (en) | 2016-07-26 | 2016-08-15 | Excess pressure protection switch and pressure appliance provided with same |
| EP16908360.7A EP3318163B1 (en) | 2016-07-26 | 2016-08-15 | Excess pressure protection switch and pressure appliance provided with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610600181.0A CN107647770B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107647770A CN107647770A (en) | 2018-02-02 |
| CN107647770B true CN107647770B (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610600181.0A Active CN107647770B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
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| Country | Link |
|---|---|
| CN (1) | CN107647770B (en) |
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| CN1449707A (en) * | 2002-04-09 | 2003-10-22 | 乐金电子(天津)电器有限公司 | Steam releasing device for pressure cooker |
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| GB631185A (en) * | 1945-10-11 | 1949-10-28 | British Thomson Houston Co Ltd | Improvements in and relating to electric cookers |
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| CN202820911U (en) * | 2012-09-04 | 2013-03-27 | 美的集团股份有限公司 | Electrical pressure cooker with pressure limiting power off function |
| CN202919915U (en) * | 2012-09-04 | 2013-05-08 | 美的集团股份有限公司 | Electric pressure cooker with power failure protection function |
| CN203690209U (en) * | 2013-11-29 | 2014-07-02 | 佛山市华诺温控器有限公司 | Single non-automatically-resetting type pressure relief switch |
| CN103876617B (en) * | 2014-03-11 | 2016-06-08 | 九阳股份有限公司 | The pressure switch of a kind of accurate pressure control and electricity pressure cooker |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449707A (en) * | 2002-04-09 | 2003-10-22 | 乐金电子(天津)电器有限公司 | Steam releasing device for pressure cooker |
| CN2859143Y (en) * | 2005-04-22 | 2007-01-17 | 郑银光 | Pressure controlling device |
| CN2805607Y (en) * | 2005-06-13 | 2006-08-16 | 林雅 | Pressure cooker steam discharing equipment |
| CN201362797Y (en) * | 2009-02-25 | 2009-12-16 | 浙江华光电器集团有限公司 | Vaporization boiler pressure switch |
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| Publication number | Publication date |
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| CN107647770A (en) | 2018-02-02 |
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