Contact pressure indication alarm device and high-voltage switch having the same

Abstract

The present invention discloses a contact pressure indication alarm device and a high-voltage switch having the same, comprising a static contact, two moving contact blades, two pressure plates arranged on the two moving contact blades and extending relatively outside one end of the moving contact blades, and a spring structure that squeezes and connects the two pressure plates. An alarm indicator is arranged between the two pressure plates under pressure, and a temperature control alarm structure is also provided in the alarm indicator. When the pressure of the spring structure is less than the deformation elastic force of the two moving contact blades themselves, the two moving contact blades drive the two pressure plates to open backwards, so that the alarm indicator is triggered to open and send an alarm indication signal when the squeezing force exerted by the two pressure plates is less than a set value. The alarm indicator using this technical solution serves as an alarm reminder when the spring structure fails or the pressure is insufficient, so that the staff can adjust or replace the spring structure in time. At the same time, it can also serve as an alarm indication when the contact temperature is too high, thereby ensuring the safe use of the high-voltage switch.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and in particular to a contact pressure indicating alarm device and a high-voltage switch having the same. Background Art

[0002] High-voltage switches are outdoor high-voltage power distribution equipment used to disconnect and close high-voltage lines when voltage is present and no load is applied. They can also disconnect and connect very small inductive and capacitive currents.

[0003] Existing contact clamping methods for high-voltage switches are divided into spring internal pull and spring external pressure. When the moving and static contacts mate, the moving contact can be pressed by an external pressure spring or an internal pull spring to press the static contact between the conductive surfaces of the two moving contacts, thereby providing continuous and reliable contact pressure for the moving and static contacts. During use, the internal pull spring is hooked inside the two moving contacts, thereby tightening the moving contacts on both sides to generate a clamping force. However, due to the current shunting through the internal pull spring, the spring resistance is high, which can easily cause heat failure. In addition, during use, the external pressure spring is set outside the two moving contacts, pressing the moving contacts on both sides towards each other to generate a clamping force. Although the external pressure spring does not shun current, the contacts are active parts, and mechanical impact, assembly, and other factors can shorten the spring's lifespan and cause failure.

[0004] In summary, the above-mentioned two spring pressurization methods, the internal pull type and the external pressure type, still have the following problems in actual use: 1. During long-term use, the internal pull type or the external pressure type spring will fail due to mechanical impact, assembly, and the spring's own life. This will cause the contact pressure between the moving and static contacts to decrease, resulting in poor contact between the contacts. Continuing to use it without knowing it will cause the contacts to burn, posing a safety hazard and causing significant losses; 2. When the contact temperature of the high-voltage switch rises or even an overload occurs, the spring temperature will continue to rise due to heat conduction, and excessive temperature will directly affect the performance and service life of the spring. Failure to cut off the power supply in time will cause damage to the high-voltage switch. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the internal pull or external pressure spring in the existing technology will fail during long-term use, resulting in a decrease in the contact pressure between the moving and static contacts. Continuing to use it without knowing it will cause the contacts to burn, posing a safety hazard. The present invention thus provides a contact pressure indication alarm device that serves as an alarm indicator when the spring pressure fails, facilitates timely replacement of the spring, and ensures safe use of the product, as well as a high-voltage switch having the same.

[0006] In order to solve the above problems, the present invention provides a contact pressure indication alarm device, comprising a static contact and two movable contact blades that are clamped and in contact with the static contact, and a pressure component arranged between the two movable contact blades, the pressure component comprising two pressure plates respectively arranged on the two movable contact blades and extending from one end of the two movable contact blades relative to each other, and a spring structure that squeezes and connects the two pressure plates, and the two pressure plates apply pressure to the two movable contact blades to clamp the static contacts towards each other under the action of the spring structure, and also includes an alarm indicator arranged between the two pressure plates under pressure relative to one end of the movable contact blades, when the pressure of the spring structure is less than the deformation elastic force of the two movable contact blades themselves, the two movable contact blades drive the two pressure plates to open back to back, so that the alarm indicator is triggered to open and send an alarm indication signal when the squeezing force exerted by the two pressure plates is less than a set value.

[0007] In the above-mentioned contact pressure indication alarm device, the two ends of the alarm indicator are arranged in the front end openings of the two pressure plates through the positioning shaft, and the front ends of the two pressure plates are correspondingly provided with positioning holes that are installed in cooperation with the positioning shaft; the two pressure plates, driven by the movable contact knife, have a first state in which the front end opening distance is increased when they are opened back to back, and a second state in which the front end opening distance is reduced when they are approaching each other.

[0008] In the above-mentioned contact pressure indication alarm device, the alarm indicator includes a shell and a first alarm switch arranged in the shell, and a telescopic top rod assembly connected to the first alarm switch, the telescopic top rod assembly elastically extends from both ends of the shell and abuts against the inner side walls of the two pressure plates; the telescopic top rod assembly extends toward the outside of the two ends of the shell when the two pressure plates are opened back to back, and triggers the first alarm switch to turn on; the telescopic top rod assembly contracts toward the inside of the two ends of the shell when the two pressure plates approach each other, and triggers the first alarm switch to turn off.

[0009] In the above-mentioned contact pressure indicating alarm device, the telescopic push rod assembly includes a group of push rods movably arranged at both ends of the shell along the axial direction of the shell, and a group of first springs connected between the first alarm switch and the group of push rods. The elastic force applied by the push rods to the first alarm switch through the first springs is used to trigger the opening or closing of the first alarm switch.

[0010] In the above-mentioned contact pressure indication alarm device, a limiting structure is provided between the two ends of the shell sleeve and the push rod for limiting the push rod from escaping from the two ends of the shell sleeve; the push rod has a central cavity arranged axially therethrough, and the two ends of the shell sleeve are respectively provided with positioning shafts passing through the central cavity.

[0011] In the above-mentioned contact pressure indicating alarm device, the alarm indicator is further provided with a temperature control alarm structure for being triggered to turn on when the temperature of the movable contact blade exceeds a set value.

[0012] In the above-mentioned contact pressure indication alarm device, the temperature control alarm structure includes a second alarm switch arranged in the alarm indicator, and a group of memory alloy springs connected between the second alarm switch and the two pressure plates. The movable contact knife conducts heat with the memory alloy spring through the pressure plate, and the second alarm switch is triggered by the elastic force of the memory alloy spring. The elastic force of the memory alloy spring decreases as the temperature of the movable contact knife increases; the second alarm switch is triggered to open when the temperature of the memory alloy spring exceeds the set value, and is triggered to close when the temperature of the memory alloy spring is lower than the set value.

[0013] In the above-mentioned contact pressure indicating alarm device, a transmission assembly is arranged between a group of the memory alloy springs and the second alarm switch, and the transmission assembly includes a group of transmission blocks movably arranged in a group of the push rods, and a group of second springs connected between the transmission blocks and the second alarm switch. The memory alloy spring is passed through the positioning shaft and the push rod, and its two ends are respectively abutted against the transmission block and the pressure plate; the transmission block is arranged in a ring shape on the side wall of the positioning shaft, so that the positioning shaft can be elastically and movably arranged in the middle cavity of the push rod, and the inner end of the push rod is provided with an annular boss opposite to the transmission block.

[0014] In the above-mentioned contact pressure indicating alarm device, the alarm indicator includes a luminous buzzer connected to the first alarm switch and the second alarm switch respectively, and the luminous buzzer is arranged on the housing.

[0015] In the above-mentioned contact pressure indication alarm device, the spring structure includes a bolt rod inserted between the two movable contact knives and the two pressure plates, a compression spring sleeved on the bolt rod and pressed against the outer wall of one or both of the pressure plates, and a limit nut screwed into one end of the bolt rod for locking the compression spring.

[0016] The present invention also provides a high-voltage switch, including the contact pressure indication alarm device described in any one of the above-mentioned embodiments, wherein the movable contact blade is clamped on the static contact and the relative position is locked by a locking structure, and the locking structure includes a locking member rotatably arranged between the two movable contact blades, and a locking plate arranged at the bottom of the static contact and forming a limiting fit with the locking member, a reset torsion spring between the locking member and the movable contact blade, and a guide slope is provided on the hook end of the locking member that is hooked against the locking plate.

[0017] In the above-mentioned high-voltage switch, the movable contact knife is provided with an operating device for driving the locking member to release the limit engagement with the lock plate and drive the movable contact knife to separate from the static contact. The operating device is arranged between the two movable contact knives by rotating the rotating shaft. It includes an operating hole and a drive groove with an opening toward the locking member. The locking member has a lever portion abutting against the drive groove. The lever portion drives the hook end portion to rotate and disengage from the lock plate under the drive of the operating device.

[0018] The technical solution of the present invention has the following advantages over the prior art:

[0019] 1. In the contact pressure indication alarm device provided by the present invention, the spring structure of the pressure assembly provides pressure for clamping the static contact to the two movable contact blades, so that the two movable contact blades have an elastic deformation effect when under pressure, driving the two pressure plates toward each other. By providing an alarm indicator between the two pressure plates, when the spring structure normally provides pressure, that is, the pressure of the spring structure is greater than the deformation elastic force of the two movable contact blades, the alarm indicator remains in the closed state and the alarm is not triggered. When the spring structure fails or the pressure is insufficient, that is, the pressure of the spring structure is less than the deformation elastic force of the two movable contact blades, the two movable contact blades drive the two pressure plates to open back to each other during the process of recovering the deformation. At this time, the alarm indicator is triggered by the squeezing force of the two pressure plates being less than a set value, and an alarm indication signal (such as an audible, visual, or electrical signal) is sent. The alarm indicator designed in this way serves as an alarm reminder when the spring structure fails or the pressure is insufficient, which facilitates the staff to adjust or replace the spring structure in a timely manner, avoids poor contact between the movable and static contacts, and ensures the safe and reliable use of the high-voltage switch.

[0020] 2. In the contact pressure indication alarm device provided by the present invention, the alarm indicator includes a first alarm switch and a telescopic push rod assembly arranged in the shell, and the telescopic push rod assembly extends out of the two ends of the shell and abuts against the inner side walls of the two pressure plates. With this structural arrangement, when the spring is in normal use, the two pressure plates are subjected to the pressure of the spring structure, thereby reducing the front end opening distance of the two pressure plates, so that the telescopic push rod assembly is squeezed toward the two ends of the shell and retracts. At this time, the first alarm switch is subjected to an increase in the force applied by the telescopic push rod assembly, thereby triggering the closing of the first alarm switch. In the closed state, the first alarm switch does not send an alarm signal. When the spring fails, the two pressure plates follow the two moving contact knives to open back to back, thereby increasing the front end opening distance of the two pressure plates, causing the telescopic push rod assembly to extend outward from the two ends of the shell after losing the pressure of the pressure plates. At this time, the first alarm switch is subjected to a decrease in the force applied by the telescopic push rod assembly, thereby triggering the opening of the first alarm switch and sending an alarm signal, thereby serving as an alarm reminder.

[0021] 3. In the contact pressure indication alarm device provided by the present invention, the temperature control alarm structure includes a second alarm switch arranged in the shell, and a group of memory alloy springs connected between the second alarm switch and the two pressure plates. The movable contact knife conducts heat with the memory alloy spring through the pressure plate. The elastic force of this memory alloy spring decreases as the temperature of the movable contact knife increases, so that the force exerted by the memory alloy spring on the second alarm switch gradually decreases, thereby triggering the second alarm switch to switch from a closed state to an open state. The advantage of this design is that when the temperature of the movable contact knife is too high or even overloaded, the temperature of the memory alloy spring will exceed the set value. At this time, the second alarm switch is triggered to turn on and send an alarm indication signal to indicate that the temperature of the movable contact knife is too high or an overload fault occurs, thereby reminding the staff to discover the fault in time and cut off the line power supply, thereby solving the problem of excessive contact temperature affecting the performance and service life of the spring structure, while ensuring the safe use of the high-voltage switch and load.

[0022] 4. In the contact pressure indication alarm device provided by the present invention, this alarm indication device has both a pressure alarm indication function for the spring structure and a temperature control alarm indication function for the movable contact blade, thereby improving the performance of the product.

[0023] 5. In the high-voltage switch provided by the present invention, the locking member cooperates with the two moving contact blades to hook against the lock plate to form a limit fit when the two moving contact blades are clamped on the static contact, thereby playing a limit locking role for the moving contact blade and the static contact in the closed state, so as to prevent the moving and static contacts from being separated by accidental operation when the switch is closed. In addition, by providing a guiding inclined surface on the hook end of the locking member, when the moving contact blade drives the locking member to contact the lock plate, it is conducive to guiding the hook end to slide smoothly into the hook and abut against the bottom of the lock plate, which is convenient for operation and use.

[0024] 6. In the high-voltage switch provided by the present invention, an operating device is provided on the movable contact blade, and the locking member has a lever portion that abuts against the driving groove of the operating device. With this structural arrangement, when the high-voltage switch needs to be opened, the operating device drives the movable contact blade to rotate in a direction away from the static contact. During this process, the lever portion is pushed by the operating device to drive the locking member to rotate, thereby driving the hook end to disengage from the lock plate, thereby releasing the limiting fit between the locking member and the lock plate. Then, continuing to pull the operating device can drive the movable contact blade to separate from the static contact, thereby realizing the opening operation of the high-voltage switch. The entire operation process is simple, and the operation saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0026] Figure 1A schematic structural diagram of the contact pressure indication alarm device provided by the present invention;

[0027] Figure 2 It is a schematic plan view of the structure of the contact pressure indicating alarm device of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the alarm indicator of the present invention;

[0029] Figure 4 Schematic diagram of the cross-sectional structure of the alarm indicator of the present invention;

[0030] Figure 5 A schematic diagram of the planar structure of the high-voltage switch provided by the present invention;

[0031] Figure 6 It is a schematic diagram of the installation structure of the locking structure and the operating device of the present invention;

[0032] Explanation of the accompanying drawings: 1. Moving contact blade; 2. Static contact; 3. Spring structure; 31. Compression spring; 32. Bolt rod; 4. Pressure plate; 5. Alarm indicator; 50. Shell; 51. First alarm switch; 52. Second alarm switch; 53. Positioning shaft; 54. Limiting structure; 6. Telescopic push rod assembly; 61. Push rod; 62. First spring; 7. Memory alloy spring; 71. Transmission block; 72. Second spring; 8. Locking structure; 81. Locking member; 811. Hook end; 812 Rod portion; 82. Locking plate; 83. Reset torsion spring; 9. Operating device; 91. Drive slot. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] The present embodiment will be described in detail below with reference to the accompanying drawings:

[0039] This embodiment provides Figure 1-6 The contact pressure indication alarm device shown in the figure includes a static contact 2 and two movable contact blades 1 that are clamped and contacted with the static contact 2, and a pressure component arranged between the two movable contact blades 1, the pressure component including two pressure plates 4 that are respectively arranged on the two movable contact blades 1 and extend from one end of the two movable contact blades 1 relative to each other, and a spring structure 3 that squeezes and connects the two pressure plates 4. Under the action of the spring structure 3, the two pressure plates 4 apply pressure to the two movable contact blades 1 to clamp the static contact 2 toward each other, and also include a spring structure 3 that is arranged on the two pressure plates 4 relative to one end of the movable contact blade 1. The alarm indicator 5 is arranged between the plates 4; when the pressure of the spring structure 3 is less than the deformation elastic force of the two movable contact knives 1 themselves, the two movable contact knives 1 drive the two pressure plates 4 to open back to back, so that the alarm indicator 5 is triggered to open and send an alarm indication signal when the squeezing force of the two pressure plates is less than the set value; and when the pressure of the spring structure 3 is greater than the deformation elastic force of the two movable contact knives 1 themselves, the two movable contact knives 1 are squeezed and drive the two pressure plates to press the alarm indicator 5 toward each other, and the squeezing force on the alarm indicator 5 is within the set value range and will not be triggered to open.

[0040] In the above embodiment, the spring structure of the pressure assembly provides pressure for clamping the static contact to the two movable contact blades, so that the two movable contact blades 1 have the elastic deformation effect of driving the two pressure plates 4 towards each other when under pressure. An alarm indicator 5 is provided between the two pressure plates 4. The function of the alarm indicator 5 is to be triggered according to the change in the size of the squeezing force of the two pressure plates 4, thereby judging whether the pressure provided by the spring structure 3 is normal. Therefore, when the spring structure 3 provides pressure normally, that is, the pressure of the spring structure 3 is greater than the deformation elastic force of the two movable contact blades 1, the alarm indicator 5 at this time remains in the closed state and will not be triggered. When the spring structure 3 fails or the pressure is insufficient, that is, the pressure of the spring structure 3 is less than the deformation elastic force of the two movable contact blades 1, the two movable contact blades 1 drive the two pressure plates 4 to open back to back in the process of restoring the deformation. At this time, the alarm indicator 5 is triggered by the squeezing force of the two pressure plates being less than the set value, and sends an alarm indication signal (sound, light or electrical signal, etc.). The alarm indicator 5 designed in this way plays an alarm reminder role when the spring structure fails or the pressure is insufficient, which is beneficial for the staff to replace the spring structure in time, avoid poor contact between the moving and static contacts, and ensure the safe and reliable use of the high-voltage switch.

[0041] like Figure 2 As shown, the spring structure 3 preferably adopts an external pressure spring setting method, which includes a bolt rod 32 passed through the two movable contact knives 1 and the two pressure plates 4, and a compression spring 31 sleeved on the bolt rod 32 and pressed against the outer side wall of one of the pressure plates 4, and a limit nut screwed into one end of the bolt rod 32 for locking the compression spring 31. The two pressure plates 4 are correspondingly arranged on the outer side walls of the two movable contact knives 1, so that the compression spring 31 applies force to press against the outer sides of the two movable contact knives 1, and generates pressure to clamp the static contact 2 by pressing the movable contact knives on both sides toward each other.

[0042] The following combination Figure 1-4 The specific setting method of the alarm indicator 5 is described in detail:

[0043] The two ends of the alarm indicator 5 are arranged in the front end openings of the two pressure plates 4 through the positioning shaft 53, and the front ends of the two pressure plates 4 are correspondingly provided with positioning holes that cooperate with the positioning shaft 53, thereby playing a positioning and installation role for the alarm indicator 5 between the two pressure plates 4; the two pressure plates 4, driven by the dynamic contact knife 1, have a first state in which the front end opening distance is increased when they are opened back to back, and a second state in which the front end opening distance is reduced when they are approached toward each other. From the above structure, it can be seen that the alarm indicator 5 is not triggered to alarm when the two pressure plates 4 are in the first state, thereby indicating that the spring structure 3 is still normally providing pressure to the dynamic contact knife 1; in addition, the alarm indicator 5 will be triggered to alarm when the two pressure plates 4 are in the second state, thereby indicating that the pressure provided by the spring structure 3 to the dynamic contact knife 1 has failed, reminding the staff to adjust or replace the spring structure to ensure the safe use of the contact.

[0044] Combine Figure 3-4As shown, the alarm indicator 5 includes a shell 50 and a first alarm switch 51 arranged in the shell 50, and a telescopic top rod assembly 6 connected to the first alarm switch 51, the telescopic top rod assembly 6 elastically extends out of the two ends of the shell 50 and abuts against the inner side walls of the two pressure plates 4; the telescopic top rod assembly 6 extends outwards toward the two ends of the shell 50 when the two pressure plates 4 are opened back to back, and triggers the first alarm switch 51 to turn on; the telescopic top rod assembly 6 contracts toward the two ends of the shell 50 when the two pressure plates 4 approach each other, and triggers the first alarm switch 51 to turn off. With this structural arrangement, when the spring structure 3 is in normal use, the two pressure plates 4 are subjected to the pressure of the spring structure 3, thereby reducing the front end opening distance of the two pressure plates 4, causing the telescopic push rod assembly 6 to retract toward the two ends of the shell sleeve 50 when being squeezed toward each other by the two pressure plates 4. At this time, the first alarm switch 51 is subjected to an increased force applied by the telescopic push rod assembly 6, thereby triggering the closing of the first alarm switch 51. The first alarm switch 51 in the closed state does not send an alarm signal. When the spring structure 3 fails, the two pressure plates 4 follow the two moving contact knives 1 to open back to back, thereby increasing the front end opening distance of the two pressure plates 4, causing the telescopic push rod assembly 6 to extend toward the outside of the two ends of the shell sleeve after losing the pressure of the pressure plates. At this time, the first alarm switch 51 is subjected to a reduced force applied by the telescopic push rod assembly, thereby triggering the opening of the first alarm switch and sending an alarm signal, thereby serving as an alarm reminder.

[0045] As a preferred embodiment, the telescopic push rod assembly 6 includes a set of push rods 61 movably disposed in the axial direction of the housing at both ends of the housing 50, and a set of first springs 62 connected between the first alarm switch 51 and the push rods 61. The push rods 61 have a central cavity extending axially therethrough. Positioning shafts 53 extending through the central cavity are provided at each end of the housing 50. The push rods 61 exert elastic force on the first alarm switch 51 through the first springs 62, thereby triggering the opening or closing of the first alarm switch 51. In this embodiment, the first alarm switch 51 can preferably be a pressure-sensitive switch or a microswitch, wherein the pressure-sensitive switch achieves on-off control by detecting the elastic force exerted by the first spring and outputs two signals. Alternatively, the microswitch achieves on-off control by pressing or resetting an elastic button connected to the first spring and also capable of outputting two signals.

[0046] In order to prevent the push rod 61 from falling out of the two ends of the housing 50 under the action of the first spring 62, Figure 4As shown, a limiting structure 54 is provided between the two ends of the shell 50 and the push rod 61, and the limiting structure 54 includes a first annular baffle provided at both ends of the shell 50, and a second annular baffle correspondingly provided on the inner end of the push rod 61 and opposite to the first annular baffle.

[0047] In this embodiment, in order to prevent the contacts of the high-voltage switch from being burned due to excessive temperature, the alarm indicator 5 is also provided with a temperature-controlled alarm structure that is triggered to turn on when the temperature of the moving contact blade 1 exceeds a set value, thereby sending an alarm indication signal indicating that the contact temperature is too high when triggered.

[0048] Combine Figure 3-4 As shown, the temperature control alarm structure includes a second alarm switch 52 arranged in a shell 50 of the alarm indicator, and a group of memory alloy springs 7 connected between the second alarm switch 52 and the two pressure plates 4. The dynamic contact knife 1 is heat-conducted with the memory alloy spring 7 through the pressure plate 4. The second alarm switch 52 is triggered by the elastic force of the memory alloy spring 7. The elastic force of the memory alloy spring 7 decreases as the temperature of the dynamic contact knife 1 increases, so that the force applied to the second alarm switch 52 by the memory alloy spring 7 gradually decreases. The second alarm switch 52 is triggered when the temperature of the memory alloy spring 7 exceeds the set value. The advantage of this design is that when the temperature of the dynamic contact blade 1 is too high or even overloaded, the temperature of the memory alloy spring 7 will exceed the set value. At this time, the second alarm switch 52 is triggered to turn on and send an alarm indication signal to indicate that the temperature of the dynamic contact blade 1 is too high or an overload fault has occurred, thereby reminding the staff to discover the fault in time and cut off the line power supply, thereby avoiding damage to the high-voltage switch due to excessive contact temperature. At the same time, it solves the problem that excessive contact temperature will affect the performance and service life of the spring structure 3, thereby ensuring the safety of the high-voltage switch.

[0049] As a preferred embodiment, a transmission assembly is provided between a group of the memory alloy springs 7 and the second alarm switch 52, and the transmission assembly includes a group of transmission blocks 71 movably arranged in a group of the push rods 61, and a group of second springs 72 connected between the transmission block 71 and the second alarm switch 52, the memory alloy spring 7 is passed between the positioning shaft 53 and the push rod 61, and its two ends are respectively abutted on the transmission block 71 and the pressure plate 4, wherein the transmission block 71 is arranged in a ring shape on the side wall of the positioning shaft 53, so that the positioning shaft 53 can be elastically and movably arranged in the middle cavity of the push rod 61, and the inner end of the push rod 61 is provided with an annular boss opposite to the transmission block 71, and the length distance of the positioning shaft 53 passing through the positioning hole is greater than its movable distance in the push rod 61, so as to prevent the positioning shaft 53 from falling out of the positioning hole of the pressure plate 4. With this structural arrangement, when the elastic force of the memory alloy spring 7 becomes smaller, the transmission block 71 will move to the side away from the second alarm switch 52 under the action of the second spring 72, so that the pressure on the second alarm switch 52 is reduced and it is triggered to open. In the opened state, the second alarm switch 52 sends an alarm indication signal indicating that the contact temperature is too high; conversely, when the elastic force of the memory alloy spring 7 recovers and becomes larger, the transmission block 71 will move to the side close to the second alarm switch 52 under the action of the memory alloy spring 7, so that the pressure on the second alarm switch 52 is increased and it is triggered to close. In the closed state, the second alarm switch 52 does not send an alarm indication signal; the second alarm switch 52 can also adopt a pressure sensing switch or a micro switch.

[0050] Although the above-mentioned temperature control alarm structure preferably adopts the setting method of the memory alloy spring 7 and the second alarm switch 52, it is obvious that other different settings can also be adopted. For example, the temperature control alarm structure is a temperature sensing switch arranged in the shell, and the temperature sensing switch is used to detect the temperature information of the pressure plate 4 through infrared sensing or direct contact sensor probe, and triggers an alarm when the temperature information exceeds the set value.

[0051] The alarm indicator 5 includes a luminous buzzer connected to the first alarm switch 51 and the second alarm switch 52 respectively. The luminous buzzer is arranged on the shell 50. The shell 50 is provided with a plurality of light-transmitting holes that can transmit the indicator light emitted by the luminous buzzer. The luminous buzzer emits different indicator light colors and buzzing frequencies according to the triggering conditions of the first alarm switch 51 and the second alarm switch 52.

[0052] In summary, the contact pressure indication alarm device provided in this embodiment has both a pressure alarm indication function for the spring structure 3 and a temperature control alarm indication function for the movable contact blade 1, thereby improving the performance of the product.

[0053] Example 2

[0054] This embodiment provides Figure 5-6 The high-voltage switch shown includes the contact pressure indication alarm device described in Example 1. Since the high-voltage switch is provided with the contact pressure indication alarm device described above, it naturally possesses all the advantages brought about by the provision of the contact pressure indication alarm device described above. To ensure the stability and reliability of the clamping contact between the movable contact blade 1 and the stationary contact 2, the movable contact blade 1 is locked relative to the stationary contact 2 by a locking structure 8. The locking structure 8 includes a locking member 81 rotatably disposed between the two movable contact blades 1, and a locking plate 82 disposed at the bottom of the stationary contact 2 and forming a limited engagement with the locking member 81. A return torsion spring 83 is provided between the locking member 81 and the movable contact blade 1. A guide slope is provided on the hook end 811 of the locking member 81 that engages with the locking plate 82. When the movable contact blade 1 drives the locking member 81 into contact with the locking plate 82, the hook end 811 is facilitated to slide smoothly into the bottom of the locking plate 82, thereby facilitating easy operation and use. This structural setting forms a limit fit by the locking member 81 hooking on the lock plate 82, thereby limiting and locking the moving contact blade and the static contact in the closed state to prevent the moving and static contacts from being separated by accidental operation when the switch is closed.

[0055] like Figure 6 As shown, the movable contact knife 1 is provided with an operating device 9 for driving the locking member 81 and the lock plate 82 to release the limit engagement and drive the movable contact knife 1 to separate from the static contact 2. The operating device 9 is arranged between the two movable contact knives 1 by rotating through a rotating shaft, and includes an operating hole and a drive groove 91 with an opening toward the locking member 81. The locking member 81 has a lever portion 812 abutting against the drive groove 91. The lever portion 812 drives the hook end portion 811 to rotate and disengage from the lock plate 82 under the drive of the operating device 9. With this structural arrangement, when the high-voltage switch needs to be opened, the operating device 9 drives the movable contact blade 1 to rotate in a direction away from the static contact 2. During this process, the lever portion 812 is driven by the operating device 9 to drive the lock member 81 to rotate, thereby driving the hook end portion 811 to disengage from the lock plate 82, thereby releasing the limit fit between the lock member 81 and the lock plate 82. Then, by continuing to pull the operating device 9, the movable contact blade can be driven to separate from the static contact, thereby achieving the opening operation of the high-voltage switch. Similarly, when the high-voltage switch needs to be closed, the operating device 9 drives the movable contact blade 1 to rotate in a direction close to the static contact 2. While the movable and static contacts 2 are in clamping contact, the lock member 81 is hooked against the lock plate 82, thereby achieving the closing operation of the high-voltage switch. The entire operation process is simple, and the operation saves time and effort.

[0056] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A contact pressure indication alarm device, comprising a stationary contact (2), two movable contact blades (1) clamped and in contact with the stationary contact (2), and a pressure assembly arranged between the two movable contact blades (1), characterized in that: The pressure assembly includes two pressure plates (4) respectively arranged on the two movable contact knives (1) and extending from one end of the two movable contact knives (1) relative to each other, and a spring structure (3) for squeezing and connecting the two pressure plates (4). Under the action of the spring structure (3), the two pressure plates (4) apply pressure to the two movable contact knives (1) to clamp the static contacts (2) in opposite directions. The pressure assembly also includes an alarm indicator (5) which is arranged between the two pressure plates (4) and is pressurized relative to one end of the movable contact knives (1). When the pressure of the spring structure (3) is less than the deformation elastic force of the two movable contact knives (1), the two pressure plates (4) are driven by the two movable contact knives (1) to open in opposite directions, so that the alarm indicator (5) is triggered to open and send an alarm indication signal when the squeezing force of the two pressure plates is less than a set value. The alarm indicator (5) comprises a housing (50), a first alarm switch (51) arranged in the housing (50), and a telescopic push rod assembly (6) connected to the first alarm switch (51), wherein the telescopic push rod assembly (6) elastically extends outwards from both ends of the housing (50) and abuts against the inner side walls of the two pressure plates (4); when the two pressure plates (4) are opened in opposite directions, the telescopic push rod assembly (6) extends outwards from both ends of the housing and triggers the first alarm switch (51) to turn on; when the two pressure plates (4) approach each other, the telescopic push rod assembly (6) retracts inwards from both ends of the housing and triggers the first alarm switch (51) to turn off.

2. The contact pressure indication alarm device according to claim 1, characterized in that: The two ends of the alarm indicator (5) are arranged in the front end openings of the two pressure plates (4) through the positioning shaft (53), and the front ends of the two pressure plates (4) are correspondingly provided with positioning holes that are installed in cooperation with the positioning shaft (53); the two pressure plates (4) have a first state in which the front end opening distance is increased when they are opened in opposite directions under the drive of the movable contact knife (1), and a second state in which the front end opening distance is reduced when they are approaching each other.

3. The contact pressure indication alarm device according to claim 2, characterized in that: The telescopic push rod assembly (6) comprises a group of push rods (61) movably arranged at both ends of the shell (50) along the axial direction of the shell (50), and a group of first springs (62) connected between the first alarm switch (51) and the group of push rods (61). The push rods (61) exert elastic force on the first alarm switch (51) through the first springs (62) to trigger the opening or closing of the first alarm switch (51).

4. The contact pressure indication alarm device according to claim 3, characterized in that: A limiting structure (54) is provided between the two ends of the shell (50) and the push rod (61) for limiting the push rod (61) from escaping from the two ends of the shell (50); the push rod (61) has a central cavity extending through the shell along the axial direction, and the two ends of the shell (50) are respectively provided with a positioning shaft (53) passing through the central cavity.

5. The contact pressure indication alarm device according to any one of claims 3-4, characterized in that: The alarm indicator (5) is also provided with a temperature control alarm structure for being triggered to turn on when the temperature of the movable contact knife (1) exceeds a set value.

6. The contact pressure indication alarm device according to claim 5, characterized in that: The temperature control alarm structure includes a second alarm switch (52) arranged in the alarm indicator, and a group of memory alloy springs (7) connected between the second alarm switch (52) and two pressure plates (4); the movable contact knife (1) is heat-conducted with the memory alloy springs (7) through the pressure plates (4); the second alarm switch (52) is triggered by the elastic force of the memory alloy springs (7); the elastic force of the memory alloy springs (7) decreases as the temperature of the movable contact knife (1) increases; the second alarm switch (52) is triggered to open when the temperature of the memory alloy springs (7) exceeds a set value, and is triggered to close when the temperature of the memory alloy springs (7) is lower than the set value.

7. The contact pressure indication alarm device according to claim 6, characterized in that: A transmission assembly is provided between a group of the memory alloy springs (7) and the second alarm switch (52), and the transmission assembly comprises a group of transmission blocks (71) movably provided in a group of the push rods (61), and a group of second springs (72) connected between the transmission blocks (71) and the second alarm switch (52). The memory alloy spring (7) is passed through between the positioning shaft (53) and the push rod (61), and its two ends respectively abut against the transmission block (71) and the pressure plate (4); the transmission block (71) is provided in a ring shape on the side wall of the positioning shaft (53), so that the positioning shaft (53) can be elastically and movably provided in the middle cavity of the push rod (61), and the inner end of the push rod (61) is provided with an annular boss opposite to the transmission block (71).

8. The contact pressure indication alarm device according to claim 7, characterized in that: The alarm indicator (5) comprises a luminous buzzer connected to a first alarm switch (51) and a second alarm switch (52) respectively, and the luminous buzzer is arranged on the housing (50).

9. The contact pressure indication alarm device according to any one of claims 6 to 8, characterized in that: The spring structure (3) includes a bolt rod (32) passing between two movable contact knives (1) and two pressure plates (4), a compression spring (31) sleeved on the bolt rod (32) and pressed against the outer wall of one or two of the pressure plates (4), and a limiting nut screwed into one end of the bolt rod (32) for locking the compression spring (31).

10. A high voltage switch, characterized in that: The invention comprises a contact pressure indicating alarm device according to any one of claims 1 to 9, wherein the movable contact blade (1) is locked in relative position by a locking structure (8) when clamped on the static contact (2), the locking structure (8) comprises a locking member (81) rotatably arranged between the two movable contact blades (1), and a locking plate (82) arranged at the bottom of the static contact (2) and forming a limiting fit with the locking member (81), a reset torsion spring (83) between the locking member (81) and the movable contact blade (1), and a guide slope is provided on the hook end (811) of the locking member (81) that is hooked against the locking plate (82).

11. A high voltage switch according to claim 10, characterized in that: The movable contact knife (1) is provided with an operating device (9) for driving the locking member (81) and the locking plate (82) to release the limiting engagement and drive the movable contact knife (1) to separate from the static contact (2). The operating device (9) is arranged between the two movable contact knives (1) by rotating the rotating shaft, and comprises an operating hole and a driving groove (91) with an opening facing the locking member (81). The locking member (81) has a lever portion (812) abutting against the driving groove (91). The lever portion (812) drives the hook end portion (811) to rotate and disengage from the locking plate (82) under the drive of the operating device (9).

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