CN107647779B - Overvoltage protection switch and pressure appliance with same - Google Patents
Overvoltage protection switch and pressure appliance with same Download PDFInfo
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- CN107647779B CN107647779B CN201610600110.0A CN201610600110A CN107647779B CN 107647779 B CN107647779 B CN 107647779B CN 201610600110 A CN201610600110 A CN 201610600110A CN 107647779 B CN107647779 B CN 107647779B
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- overvoltage protection
- pressure
- locking
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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
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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
- A47J27/0804—Locking devices
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- Food Science & Technology (AREA)
- Push-Button Switches (AREA)
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 touch rod, a locking torsion spring, 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 normally contacting the first contact; a locking groove is formed on the touch rod; a communicating port communicated with the external environment is formed on the switch body; the sealing device is arranged in the switch body, the sealing touch rod is connected with the sealing device, and the sealing device is constructed in a way that when the environmental pressure applied by the communication port reaches a preset pressure, the sealing device drives the touch rod to touch the second switch terminal to enable the second contact to move from the contact position to the disconnection position; the first end of locking torsional spring is the stiff end and the second end is the expansion end, and the second end cooperation of locking torsional spring is in the locking inslot so that the second contact keeps at the off-position. According to the overvoltage protection switch disclosed by the invention, power-off protection under abnormal overvoltage can be 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 having a second contact in constant contact with the first contact; the touch rod is arranged adjacent to the second switch terminal, and a locking groove is formed in the touch rod; the switch comprises a switch body, wherein a communication port communicated with the external environment is formed in the switch body, and the first switch terminal, the second switch terminal, the touch rod and the locking torsion spring are all arranged in the switch body; the sealing device is arranged in the switch body, the touch rod is connected with the sealing device, and the sealing device is configured to drive the touch rod to touch the second switch terminal to enable the second contact to move from a contact position normally contacted with the first contact to a disconnection position separated from the first contact when the environmental pressure applied by the communication port reaches the preset pressure; the first end of the locking torsion spring is a fixed end, the second end of the locking torsion spring is a movable end, and the second end of the locking torsion spring is suitable for being matched in the locking groove to enable the second contact to be kept at the off 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, the touch rod and the locking torsion spring are arranged, when the pressure in the pressure appliance reaches the preset pressure, the first contact and the second contact are disconnected, the heating circuit with the first switch terminal and the second switch terminal of the pressure appliance can be disconnected, and therefore power-off protection under abnormal overvoltage can be effectively achieved.
According to some embodiments of the present invention, the first end of the touch lever is adapted to touch the second switch terminal, the locking groove is formed on a side of the first end of the touch lever adjacent to a center of the touch lever, and the second end of the locking torsion spring abuts against an outer peripheral wall of the first end of the touch lever when the second contact point is located at the contact position.
According to some embodiments of the invention, the locking groove is formed as an annular groove extending in a circumferential direction of the trip lever.
According to some embodiments of the invention, the overvoltage protection switch further comprises: the locking fixing base, be formed with the guiding hole on the locking fixing base, the touch pole is established in the guiding hole, just the first end of touch pole is suitable for stretching out the guiding hole touches second switch terminal, the second end of touch pole with sealing device links to each other, wherein the locking torsional spring the second end support is in on the locking fixing base.
Further, be equipped with the backstop muscle of outside extension on the periphery wall of the second end of touch bar, overvoltage protection switch further includes: the elastic reset piece is stopped to abut against the inner wall of the guide hole and between the stop ribs, and the elastic reset piece is constructed to normally push the touch rod towards the direction far away from the second switch terminal.
Optionally, the first switch terminal and the second switch terminal are disposed on the locking fixing seat.
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.
According to some embodiments of the invention, the predetermined pressure is P, said P satisfying: 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 invention comprises an overvoltage protection switch according to the above-mentioned first aspect of the invention.
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 a top view of the overvoltage protection switch shown in fig. 1;
fig. 3 is another cross-sectional view of an overvoltage protection switch in accordance with an embodiment of the invention, wherein the second contact is in the open position;
fig. 4 is a top view of the overvoltage protection switch shown in fig. 3.
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;
3: a touch rod is touched; 31: a locking groove; 32: a stopper rib;
4: a locking torsion spring; 41: a second end;
5: a locking fixing seat; 51: a guide hole; 6: an elastic reset member;
7: a switch body; 71: a communication port; 8: a sealing device; 9: and (4) conducting wires.
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 first aspect of the invention is described below with reference to fig. 1-4. The overvoltage protection switch 100 can be used for pressure appliances requiring pressure power-off protection, such as an electric pressure cooker (not shown), 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 a normal pressure relief device, such as a pressure relief valve, of a pressure appliance, such as an electric pressure cooker, fails and an abnormal overpressure occurs (i.e., the pressure in the pressure appliance is greater than its normal pressure use range, such as 70kPa), the overpressure protection switch 100 can power off a heating device in the pressure appliance, so that the heating device stops heating, and the pressure in the pressure appliance 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, such as electric pressure cookers, etc.
As shown in fig. 1 to 4, 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 trip lever 3, a latching torsion spring 4, a switch body 7 and a sealing device 8.
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 3, a first contact 11 is provided on one side (for example, the upper side in fig. 1 and 2) of the first switch terminal 1, the first contact 11 being formed to protrude upward from the upper surface of the first switch terminal 1.
A second contact 21 is provided at a free end (e.g., right end in fig. 1 and 3) of the second switch terminal 2, the second contact 21 being formed to protrude downward from a lower surface of the second switch terminal 2. Specifically, the first end (e.g., the left end in fig. 1 and 3) of the second switch terminal 2 is a fixed end, while 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 (e.g., the right end in fig. 1 and 3) of the second switch terminal 2 is a movable 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.
The first switch terminal 1 and the second switch terminal 2 are adapted to be connected (e.g. by means of wires 9) in a heating circuit (not shown in the figures) of a pressure appliance, such as an electric pressure cooker, said heating circuit comprising heating means. When the pressure appliance, 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 works to heat food and the like in the pressure appliance.
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.
The touch lever 3 is disposed adjacent to the second switch terminal 2, for example, as shown in fig. 1 and 3, and the touch lever 3 is located on the same side (for example, the lower side in fig. 1 and 3) of the second switch terminal 2 as the first switch terminal 1. The trip lever 3 is not in contact with the second switch terminal 2 under normal conditions (e.g., when the second contact 21 is in the contact position). The trip lever 3 is configured to trip the second switch terminal 2 to move the second contact 21 from a contact position (shown in fig. 1 and 2) in which it is normally in contact with the first contact 11 to an open position (shown in fig. 3 and 4) in which it is separated from the first contact 11 when the ambient pressure reaches a predetermined pressure. Here, it should be noted that when the overvoltage protection switch 100 is used in a pressure appliance such as an electric pressure cooker, the "ambient pressure" can be understood as the pressure in the pressure appliance such as an electric pressure cooker. The trip lever 3 is formed with a locking groove 31.
For example, when the pressure in a pressure appliance such as an electric pressure cooker reaches a predetermined pressure, the touch rod 3 contacts the second switch terminal 2 and touches the second switch terminal 2 to separate (i.e., not contact) the second contact 21 from the first contact 11, thereby disconnecting the heating circuit, deactivating the heating device, gradually reducing the pressure in the pressure appliance such as an electric pressure cooker, protecting the pressure appliance such as an electric pressure cooker, and preventing a user from being injured because the pressure appliance such as an electric pressure cooker does not discharge high-temperature and high-pressure gas.
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 can be specifically set according to the type of the actual pressure appliance, such as an electric pressure cooker, so as to better meet the actual requirement.
The switch body 7 is formed with a communication port 71 communicating with the external environment, and for example, as shown in fig. 1 and 3, the communication port 71 may be formed at the bottom of the switch body 7. When the overvoltage protection switch 100 is used in a pressure appliance such as an electric pressure cooker, the "external environment" refers to the interior of the pressure appliance such as an electric pressure cooker. Wherein the locking fixing seat 5 is fixed in the switch body 7. Therefore, the switch body 7 capable of accommodating the first switch terminal 1, the second switch terminal 2, the touch rod 3 and the locking torsion spring 4 is arranged, and the integration of the overvoltage protection switch 100 is improved.
The sealing device 8 is arranged in the switch body 7, the touch rod 3 is connected with the sealing device 8, and the sealing device 8 is configured that when the environmental pressure applied through the communication port 71 reaches a preset pressure, the sealing device 8 drives the touch rod 3 to touch the second switch terminal 2, so that the second contact 21 moves from a contact position which is normally contacted with the first contact 11 to a disconnection position which is separated from the first contact 11. Thus, by providing the sealing means 8, the sealing means 8 can isolate the interior of the switch body 7 from the interior of a pressure appliance, such as an electric pressure cooker, so that a pressure difference exists between the interior of the switch body 7 and the interior of the pressure appliance, such as an electric pressure cooker, and thus, when the interior of the pressure appliance, such as an electric pressure cooker, is abnormally over-pressurized, the sealing means 8 can push the contact rod 3 to move upwards under the action of the pressure difference to contact the second switch terminal 2.
The first end of the locking torsion spring 4 is a fixed end, the first end of the locking torsion spring 4 is fixed, the second end 41 of the locking torsion spring 4 is a movable end, the second end 41 of the locking torsion spring 4 is movable relative to the first end, and the second end 41 of the locking torsion spring 4 is adapted to fit in the locking groove 31 to maintain the second contact 21 at the off position. Therefore, through the matching of the locking torsion spring 4 and the touch rod 3, the overvoltage protection switch 100 cannot be reset after being used once (the first contact 11 and the second contact 21 are disconnected), namely, the first contact 11 and the second contact 21 cannot be contacted again to conduct the heating circuit, so that the use safety of the pressure appliance such as an electric pressure cooker is improved.
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 such as an electric pressure cooker, the first contact 11 and the second contact 21 are disconnected by arranging the touch rod 3 and the locking torsion spring 4, when the pressure in the pressure appliance 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 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 can not occur, and the use safety of the pressure appliance 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 touch rod 3, the locking torsion spring 4 and the sealing device 8 can be integrated in the switch body 5, so that the overvoltage protection switch 100 is an integral component, and when the overvoltage protection switch 100 is used, the overvoltage protection switch 100 can be conveniently and quickly installed 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.
According to some embodiments of the present invention, a first end (e.g., an upper end in fig. 1 and 3) of the touch bar 3 is adapted to touch the second switch terminal 2, for example, as shown in fig. 1 and 3, the touch bar 3 is movable up and down relative to the second switch terminal 2, when the touch bar 3 is located at the position shown in fig. 1, the second contact 21 is always in contact with the first contact 11, and when the pressure in a pressure appliance, such as an electric pressure cooker, is abnormal, the touch bar 3 can move up and push the second switch terminal 2, so that the second contact 21 is disconnected from the first contact 11, thereby realizing power-off protection.
Wherein a locking groove 31 is formed at a side (e.g., a lower side in fig. 1 and 3) of the first end of the trip lever 3 adjacent to a center of the trip lever 3, and when the second contact point 21 is located at the contact position, the second end 41 of the locking torsion spring 4 is stopped against the outer peripheral wall of the first end of the trip lever 3 due to a torsion force of the locking torsion spring 4 itself, as shown in fig. 1 and 2; when the pressure in a pressure appliance, such as an electric pressure cooker, is abnormal, the touch rod 3 will move upwards, in the process, the second end 41 of the locking torsion spring 4 will move downwards relative to the touch rod 3 along the side wall of the touch rod 3, and due to the torsion action of the locking torsion spring 4, the second end 41 of the locking torsion spring 4 will enter the locking groove 31 and abut against the inner wall of the locking groove 31, as shown in fig. 3 and 4, at this time, due to the limiting action of the locking torsion spring 4, the touch rod 3 will not move downwards, so that the second switch terminal 2 returns to the contact position where the second contact 21 and the first contact 11 keep in contact, thereby effectively ensuring the use safety of the pressure appliance, such as an electric pressure cooker.
Alternatively, the locking groove 31 is formed as an annular groove extending in the circumferential direction of the touch lever 3, simplifying the process of machining the touch lever 3 and facilitating the installation of the touch lever 3, thereby improving the assembly efficiency and reducing the cost. Of course, the lock groove 31 may be formed by a portion of the circumference of the trip lever 3 being recessed inward (not shown). It will be appreciated that the specific shape of the locking slot 31 can be specifically configured according to actual requirements, as long as it can be used for locking the touch lever 3 in cooperation with the locking torsion spring 4 when the second contact 21 is located at the off position.
According to some embodiments of the invention, the overvoltage protection switch 100 further comprises: a locking holder 5, wherein the above-mentioned second end 41 of the locking torsion spring 4 is supported on the locking holder 5. For example, as shown in fig. 1 to 4, the second end 41 of the locking torsion spring 4 is supported on the upper surface of the locking holder 5, thereby effectively securing the reliability of locking the touch lever 3. Wherein, locking torsional spring 4 can be installed on locking fixing base 5, and the above-mentioned first end of locking torsional spring 4 can be fixed on locking fixing base 5 this moment.
The locking fixing seat 5 is provided with a guide hole 51, the touch rod 3 is arranged in the guide hole 51, the first end of the touch rod 3 is suitable for extending out of the guide hole 51 to touch the second switch terminal 2, and the guide hole 51 has a guiding effect on the touch rod 3 so as to ensure the moving accuracy of the touch rod 3. Alternatively, the extension direction of the touch lever 3 is perpendicular to the plane of the second switch terminal 2, as shown in fig. 1, whereby the second switch terminal 2 can be touched to separate the second contact 21 from the first contact 11 better.
Further, a stop rib 32 extending outward is disposed on the outer peripheral wall of the second end of the touch rod 3, and the overvoltage protection switch 100 further includes: and an elastic restoring member 6, wherein the elastic restoring member 6 is stopped between an inner wall (for example, a top wall in fig. 1 and 3) of the guide hole 51 and the stopper rib 32, and the elastic restoring member 6 is configured to normally push the touch lever 3 in a direction away from the second switch terminal 2. For example, the elastic reset element 6 may be a spring, the spring is sleeved outside the touch rod 3, and two ends of the spring respectively abut against the top wall of the guiding hole 51 and the stopping rib 32 to normally push the touch rod 3 downward, that is, when the pressure in a pressure appliance such as an electric pressure cooker is less than a predetermined pressure, the touch rod 3 can be reset under the action of the spring.
Alternatively, the first switch terminal 1 and the second switch terminal 2 are provided on the locking fixing base 5. Of course, the first switch terminal 1 and the second switch terminal 2 may also be fixed on the inner wall of the switch body 7, hereinafter, or directly provided on a pressure appliance, such as an electric pressure cooker (not shown). It is understood that the specific arrangement positions of the first switch terminal 1 and the second switch terminal 2 can be specifically arranged according to actual requirements to better meet the actual requirements.
Wherein the second end of the trip rod 3 is connected to the sealing means 8. For example, as shown in fig. 1 and 3, the sealing means 8 is formed with a mounting groove in which the second end of the trip rod 3 is adapted to be fixed. The sealing device 8 is configured such that when an ambient pressure (e.g., an internal pressure of a pressure appliance such as an electric pressure cooker) applied through the communication port 71 reaches a predetermined pressure, the sealing device 8 drives the touch lever 3 to touch the second switch terminal 2. The sealing means 8 is used for isolating the inside of the switch body 7 from the communication opening 71, for example, from the inside of a pressure appliance, such as an electric pressure cooker, so that there is a pressure difference between the inside of the switch body 7 and the inside of the pressure appliance, such as an electric pressure cooker, so that when the inside of the pressure appliance, such as an electric pressure cooker, is abnormally over-pressurized, the sealing means 8 can push the contact rod 3 to move upwards under the action of the pressure difference to contact the second switch terminal 2.
Alternatively, the sealing device 8 is a sealing sheet, and when the second contact point 21 is located at the contact position, the sealing device 8 bulges toward the communication opening 71 to close the communication opening 71, for example, as shown in fig. 1, the edge of the sealing sheet and the bottom for closing the communication opening 71 play a role of two-layer sealing, which effectively ensures the reliability of the action of the touch lever 3. When the second contact 21 is located at the open position, the sealing device 8 bulges out in a direction away from the communication port 71, as shown in fig. 3. In this case, the sealing device 8 may be made of a material having elasticity, so that the sealing effect of the sealing device 8 can be further improved.
Optionally, the pressure-bearing area of the sealing device 8 acted on by the ambient pressure is S, where S satisfies: 1mm2≤S≤100mm2. For example, when the overvoltage protection switch 100 is used in a pressure appliance such as an electric pressure cooker, S is a pressure receiving area where the pressure in the appliance body acts on the sealing device 8.
According to the overvoltage protection switch 100 provided by the embodiment of the invention, when the pressure in a pressure appliance 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 such as an electric pressure cooker enters the switch body 7 through the communication port 71, when the steam pressure is greater than the elastic force of the elastic reset piece 6 such as a spring, the steam pushes the sealing device 8 open to drive the touch rod 3 to move to touch the second switch terminal 2, the second switch terminal 2 springs upwards after being stressed, so that the second contact 21 of the second switch terminal 2 moves upwards along with the second switch terminal 2 to separate the first contact 11 from the second contact 21, after the touch rod 3 moves upwards, when the touch rod 3 rises to the position where the locking groove 31 is approximately aligned with the locking torsion spring 4, the locking torsion spring 4 is clamped into the locking groove 31 under the action of self torsion force to clamp the touch rod 3, the pressure in the pressure appliance such as the electric pressure cooker drops, and the touch rod 3 cannot reset. Because the touch rod 3 can not return, the second switch terminal 2 can not return to the position where the second contact 21 contacts with the first contact 11, pressure protection can be effectively increased, the safety of a pressure device such as an electric pressure cooker is improved, and compared with the traditional mechanical pressure relief structure, the pressure device is safer and more reliable.
A pressure appliance, such as an electric pressure cooker, according to an embodiment of the second aspect of the invention comprises an overvoltage protection switch 100 according to the above-described embodiment of the first aspect of the invention.
Wherein the pressure appliance comprises an appliance body and an overvoltage protection switch 100. The overvoltage protection switch 100 is disposed on the appliance body, wherein the environmental pressure is the pressure in the appliance body, when the pressure in the appliance body reaches a predetermined pressure, the touch rod 3 moves upward to touch the second switch terminal 2, and the locking torsion spring 4 can lock the touch rod 3 to keep the second contact 21 at the off position. For example, the device body includes a pot body and a cover body, the top of the pot body is open, the cover body is arranged on the top of the pot body, wherein the overvoltage protection switch 100 is arranged on the cover body and is positioned in the center of the cover body. Optionally, the overpressure protection switch 100 is vertically disposed, and at this time, the communication port 71 may directly communicate with the inside of the pot body, and the pressure in the pot body may directly act on the bottom of the touch rod 3 through the communication port 71. A sealing element is arranged between the pot body and the cover body to ensure the sealing property between the pot body and the cover body.
According to the pressure appliance, such as the electric pressure cooker, disclosed 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 pressure appliances according to embodiments of the present invention, such as electric pressure cookers, 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 (10)
1. An overvoltage protection switch, comprising:
a first switch terminal having a first contact;
a second switch terminal having a second contact in constant contact with the first contact;
the touch rod is arranged adjacent to the second switch terminal, and a locking groove is formed in the touch rod;
the first end of the locking torsion spring is a fixed end, the second end of the locking torsion spring is a movable end, and the second end of the locking torsion spring is suitable for being matched in the locking groove so as to enable the second contact to be kept at a disconnected position;
the switch comprises a switch body, wherein a communication port communicated with the external environment is formed in the switch body, and the first switch terminal, the second switch terminal, the touch rod and the locking torsion spring are all arranged in the switch body;
the sealing device is arranged in the switch body, the touch rod is connected with the sealing device, the sealing device is constructed in a manner that when environmental pressure applied by the communication port reaches preset pressure, the sealing device drives the touch rod to touch the second switch terminal to enable the second contact to move from a contact position normally contacted with the first contact to a disconnection position separated from the first contact, and the sealing device is a sealing sheet.
2. The overvoltage protection switch of claim 1, wherein the first end of the trip lever is adapted to trip the second switch terminal, the detent groove is formed on a side of the first end of the trip lever adjacent to a center of the trip lever, and the second end of the detent torsion spring abuts against a peripheral wall of the first end of the trip lever when the second contact is in the contact position.
3. The overvoltage protection switch of claim 1, wherein the locking groove is formed as an annular groove extending in a circumferential direction of the trip lever.
4. The overvoltage protection switch according to any one of claims 1-3, further comprising:
the locking fixing base, be formed with the guiding hole on the locking fixing base, the touch pole is established in the guiding hole, just the first end of touch pole is suitable for stretching out the guiding hole touches second switch terminal, the second end of touch pole with sealing device links to each other, wherein the locking torsional spring the second end support is in on the locking fixing base.
5. The overvoltage protection switch of claim 4, wherein said second end of said trip arm has an outwardly extending stop rib on a peripheral wall thereof,
further comprising:
the elastic reset piece is stopped to abut against the inner wall of the guide hole and between the stop ribs, and the elastic reset piece is constructed to normally push the touch rod towards the direction far away from the second switch terminal.
6. The overvoltage protection switch of claim 4, wherein the first switch terminal and the second switch terminal are disposed on the latch anchor.
7. The overvoltage protection switch of claim 1, wherein the sealing device bulges toward the communication opening to close the communication opening when the second contact point is in the contact position, and bulges away from the communication opening when the second contact point is in the open position, and the pressure-receiving area of the environmental pressure acting on the sealing device is S, where S satisfies: 1mm2≤S≤100mm2。
8. 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.
9. The overvoltage protection switch of claim 1, wherein said overvoltage protection switch is a switch having a first terminal and a second terminalCharacterized in that the pressure-receiving area of the ambient pressure acting on the sealing means is S, wherein S satisfies: 1mm2≤S≤100mm2。
10. A pressure appliance, characterized in that it comprises an overvoltage protection switch according to any one of claims 1-9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610600110.0A CN107647779B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
| EP16908360.7A EP3318163B1 (en) | 2016-07-26 | 2016-08-15 | Excess pressure protection switch and pressure appliance provided with same |
| PCT/CN2016/095335 WO2018018670A1 (en) | 2016-07-26 | 2016-08-15 | Excess pressure protection switch and pressure appliance provided with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610600110.0A CN107647779B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
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| CN107647779A CN107647779A (en) | 2018-02-02 |
| CN107647779B true CN107647779B (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610600110.0A Active CN107647779B (en) | 2016-07-26 | 2016-07-26 | Overvoltage protection switch and pressure appliance with same |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112256085B (en) * | 2019-07-22 | 2023-06-20 | 浙江三花商用制冷有限公司 | Pressure controller |
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| CN107647779A (en) | 2018-02-02 |
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