Switch trigger structure for expanding density switch points

Abstract

The utility model belongs to the technical field of electric power protection devices, and particularly discloses a switch trigger structure for expanding density switch points, which comprises an elastic sensitive assembly, an upper shell and a lower shell, the elastic sensitive assembly is arranged in the lower shell, a guide sleeve is arranged above the elastic sensitive assembly, a guide hole is arranged in the middle of the guide sleeve, and the elastic sensitive assembly is arranged in the lower shell. A guide rod, a contact arm, a transmission rod, an ejector head, a microswitch and a switch mounting seat are arranged in the upper shell, the switch mounting seat is located on the side edge of the transmission rod, the microswitch is arranged on the switch mounting seat, the contact arm is connected to the upper portion of the transmission rod, the ejector head is arranged at the position, close to the microswitch, below the contact arm, and the guide rod is located at the position, away from the microswitch, of the contact arm. And the end part of the guide rod penetrates through the lower shell and is connected with the guide sleeve. When in use, the contact arm synchronously moves up and down along with the up-and-down movement of the transmission rod. The guide hole is used for guiding the linear motion of the transmission rod and preventing the transmission rod from deviating in the radial direction in the process of moving along the axis.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a switch trigger structure with an extended density switch point. Background Art

[0002] Insulating gas density relays are important protection and control components in power systems, especially sulfur hexafluoride gas density relays, which are usually used to monitor the density changes of sulfur hexafluoride gas in high-voltage electrical equipment and send out switch signals when the gas density is abnormal. The switch signal usually includes a low-pressure alarm switch point, a high-pressure alarm switch point, and a low-pressure lockout switch point. The gas density values ​​corresponding to each density switch point are often different according to the use requirements, so the density values ​​of each switch point constitute an interval.

[0003] However, in the prior art, please refer to Figure 4 , multiple plugs are installed on the same contact arm, and multiple micro switch buttons are installed on the same plane with the buttons facing upward. The plug presses the micro switch from directly above. As the density of the measured gas decreases, the bottom height of the elastic sensitive component decreases, driving the transmission rod and the contact arm to drop synchronously. The plugs on the contact arm trigger the micro switches at different density values ​​in turn due to different set heights. Due to the limited travel of the micro switch needle button, the plug A with the lowest initial position first triggers its corresponding micro switch B at a higher density value point. As the density continues to decrease, the plug A presses the micro switch needle button to continue to drop. When the needle button of micro switch B is pressed by the plug A until it is completely immersed in the micro switch housing, the downward movement of the plug A is blocked by the micro switch housing, and the contact arm cannot continue to drop, resulting in the failure of the remaining plugs to trigger their corresponding micro switches.

[0004] In summary, the density switch point trigger structure of the gas density relay in the prior art has the following disadvantages: the top and the microswitch are arranged relative to each other up and down, the up and down movement of the transmission rod is easily hindered by the microswitch, and the density-displacement characteristics of the elastic sensitive component are easily changed by external forces, resulting in mutual interference between the density switch points, affecting the triggering repeatability accuracy of each density switch point, and the density value range that can be set for the density switch point is limited by the over-travel of the microswitch, which cannot fully meet the requirements of the gas density monitoring range, thereby affecting the monitoring and alarm of gas density changes. Utility Model Content

[0005] The purpose of the utility model is to provide a switch trigger structure with an extended density switch point to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a switch trigger structure for expanding density switch points, comprising an elastic sensitive component, an upper shell and a lower shell, wherein the elastic sensitive component is arranged inside the lower shell, a guide sleeve is arranged above the elastic sensitive component, a guide hole is opened in the middle of the guide sleeve, a guide rod, a contact arm, a transmission rod, a head, a micro switch and a switch mounting seat are arranged inside the upper shell, the transmission rod passes through the upper shell and is inserted into the guide hole of the guide sleeve, the switch mounting seat is located on the side of the transmission rod, the switch mounting seat is arranged at the bottom of the upper shell, the micro switch is arranged on the switch mounting seat, the contact arm is connected above the transmission rod, the head is arranged below the contact arm near the micro switch, the guide rod is located at a position where the contact arm is away from the micro switch, the guide rod is parallel to the transmission rod, and the end of the guide rod passes through the lower shell and is connected to the guide sleeve. When in use, the contact arm moves up and down synchronously with the up and down movement of the transmission rod. The function of the guide hole is to guide the linear motion of the transmission rod to prevent the transmission rod from being offset in the radial direction during the movement of the axis.

[0007] The bottom of the guide sleeve limits the upper limit of the transmission rod, thereby limiting the deformation range of the elastic sensitive component and preventing the measured gas pressure from being too high, causing plastic deformation of the elastic sensitive component and further causing failure of the device.

[0008] Preferably, the bottom of the elastic sensitive component is threadedly connected to the transmission rod, and as the elastic sensitive component is elastically deformed, the transmission rod performs reciprocating linear motion along the axial direction.

[0009] Preferably, the plug is arranged at the corner of the contact arm and corresponds to the micro switch, and the plug is threadedly connected to the contact arm. The height of the plug is adjustable. The initial height of the plug can be adjusted by rotating the thread, thereby changing the density setting value of the density switch point.

[0010] Preferably, the plug is cylindrical, and a chamfer is provided at the lower end of the plug.

[0011] Preferably, a guide groove cooperating with a guide rod is provided on the side of the contact arm, and the guide rod is inserted into the guide groove to prevent the contact arm from rotating along the axis direction of the transmission shaft, thereby ensuring that the pressing position of the head is accurate.

[0012] Preferably, a gas path connector is provided at the bottom of the lower shell for connecting the measuring gas to be filled in through the gas connector of the lower shell. As the density of the filled gas changes, the elastic sensitive component undergoes corresponding elastic deformation.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model arranges the trigger structure of the top head and the micro switch so that the transmission rod can move freely without hindrance within the designed displacement, and the density-displacement performance of the transmission rod remains consistent within the designed displacement, thereby improving the repetitive accuracy of each density switch point, avoiding mutual interference between the density switch points, and being able to greatly expand the settable range of the density switch point to meet the diversified needs of the gas density monitoring range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the top view structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the switch trigger amplification structure of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the prior art.

[0019] In the figure: 201, guide rod; 202, contact arm; 203, transmission rod; 204, top head; 205, micro switch; 206, upper shell; 207, switch mounting seat; 208, guide sleeve; 209, elastic sensitive component; 210, lower shell. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-3 The utility model provides a technical solution: a switch trigger structure of an extended density switch point, comprising an elastic sensitive component 209, an upper shell 206 and a lower shell 210, wherein the elastic sensitive component 209 is arranged inside the lower shell 210, a guide sleeve 208 is arranged above the elastic sensitive component 209, a guide hole is opened in the middle of the guide sleeve 208, a guide rod 201, a contact arm 202, a transmission rod 203, a head 204, a micro switch 205 and a switch mounting seat 207 are arranged inside the upper shell 206, and the transmission rod 203 passes through the upper shell 206 and is inserted into the lower shell 210. The switch mounting seat 207 is arranged in the guide hole of the guide sleeve 208, and is located at the side of the transmission rod 203. The switch mounting seat 207 is arranged at the bottom of the upper shell 206. The micro switch 205 is arranged on the switch mounting seat 207. The contact arm 202 is connected above the transmission rod 203. The head 204 is arranged below the contact arm 202 and close to the micro switch 205. The guide rod 201 is located at a position where the contact arm 202 is far away from the micro switch 205. The guide rod 201 is parallel to the transmission rod 203, and the end of the guide rod 201 passes through the lower shell 210 and is connected to the guide sleeve 208. When in use, the contact arm 202 moves up and down synchronously with the up and down movement of the transmission rod 203. The function of the guide hole is to guide the linear motion of the transmission rod 203 and prevent the transmission rod 203 from deviating in the radial direction during the movement along the axis.

[0024] The bottom of the guide sleeve 208 limits the upper limit of the movement of the transmission rod 203, thereby limiting the deformation range of the elastic sensitive component 209, preventing the measured gas pressure from being too high, causing plastic deformation of the elastic sensitive component 209, and further causing device failure.

[0025] Furthermore, the bottom of the elastic sensitive component 209 is threadedly connected to the transmission rod 203. With the elastic deformation of the elastic sensitive component 209, the transmission rod 203 performs reciprocating linear motion along the axial direction.

[0026] Furthermore, the plug 204 is arranged at the corner of the contact arm 202 and corresponds to the micro switch 205, and the plug 204 and the contact arm 202 are connected by a thread. The height of the plug 204 is adjustable. The initial height of the plug 204 can be adjusted by rotating the thread, thereby changing the density setting value of the density switch point.

[0027] Furthermore, the plug 204 is cylindrical, and a chamfer is provided at the lower end of the plug 204 .

[0028] Furthermore, a guide groove cooperating with the guide rod 201 is formed on the side of the contact arm 202, and the guide rod 201 is inserted into the guide groove to prevent the contact arm 202 from rotating along the axis of the transmission shaft, thereby ensuring that the pressing position of the head 204 is accurate.

[0029] Furthermore, a gas path connector is provided at the bottom of the lower shell 210 for connecting the measuring gas to be filled in through the gas connector of the lower shell 210. As the density of the filled gas changes, the elastic sensitive component 209 undergoes corresponding elastic deformation.

[0030] Working principle: As the density of the monitored gas decreases, the elastic sensitive component 209 deforms and stretches, the bottom of the elastic sensitive component 209 drives the transmission rod 203 to move downward, and the contact arm 202 drives the plug 204 to move downward. When the density value of the measured gas decreases to the density value set by the density switch point 1, one of the plugs 204 also drops to the set trigger position. At this time, the side of the other plug 204 presses the needle button of the corresponding micro switch 205, and outputs the density switch point signal 1. The remaining plugs 204 fail to trigger the micro switch 205 at the current density value, so there is no corresponding density switch point signal 2 output.

[0031] As the density of the monitored gas further decreases, the contact arm 202 continues to move downward. On the one hand, the pressing stroke of the needle button of the microswitch 205 remains unchanged, and the microswitch 205 remains in the triggered state; on the other hand, the contact arm 202 is not hindered in the entire designed up and down movement stroke, and the pressure-displacement characteristics of the elastic sensitive element 208 remain consistent. Therefore, when the density of the measured gas drops to the density value set by the density switch point 2, the remaining plugs 204 also drop to the set trigger position. At this time, the side of the remaining plugs 204 presses the corresponding needle button of the microswitch 205 to output the density switch point signal 2. The remaining density switch signals can be triggered sequentially or simultaneously according to the above principle.

[0032] The following is a comparison of the density switch point setting ranges that can be satisfied by the present invention and the prior art in combination with specific data.

[0033] It is measured that the density-displacement of the elastic sensitive component 209 can be used with a maximum displacement X1=2mm; for every 0.01MPa decrease in gas density, the elastic sensitive component 209 stretches 0.1mm, that is, the transmission rod 203 moves downward △X=10mm / MPa.

[0034] It is known that the micro switch overtravel is X OT =0.5mm, that is, in the prior art solution, after the first density switch point is triggered, the limit distance that the transmission rod 203 can continue to move downward is 0.5mm.

[0035] It can be calculated that

[0036] In the solution of the present invention, the maximum density difference between density switch points can be set

[0037]

[0038] In the prior art solution, the maximum density difference between density switch points can be set

[0039]

[0040] In summary, the present application achieves improved repeatability of each density switch point through a switch trigger structure that expands the settable range of the density switch point, and the density switch points will not interfere with each other. At the same time, the settable range of the density switch point can be expanded to the entire displacement stroke range of the transmission rod 203, and is no longer limited by the over-stroke of the micro switch.

[0041] It is worth noting that the entire device is controlled by a main control button. Since the device matched with the control button is a common device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A switch trigger structure for extending density switch points, characterized in that: The invention comprises an elastic sensitive component (209), an upper shell (206) and a lower shell (210), wherein the elastic sensitive component (209) is arranged inside the lower shell (210), a guide sleeve (208) is arranged above the elastic sensitive component (209), a guide hole is opened in the middle of the guide sleeve (208), a guide rod (201), a contact arm (202), a transmission rod (203), a head (204), a micro switch (205) and a switch mounting seat (207) are arranged inside the upper shell (206), the transmission rod (203) passes through the upper shell (206) and is inserted into the guide hole of the guide sleeve (208), and the switch mounting seat (207) is arranged inside the upper shell (206). The mounting seat (207) is located on the side of the transmission rod (203), the switch mounting seat (207) is arranged at the bottom of the upper shell (206), the micro switch (205) is arranged on the switch mounting seat (207), the contact arm (202) is connected above the transmission rod (203), the head (204) is arranged below the contact arm (202) and close to the micro switch (205), the guide rod (201) is located at a position where the contact arm (202) is away from the micro switch (205), the guide rod (201) is parallel to the transmission rod (203), and the end of the guide rod (201) passes through the lower shell (210) and is connected to the guide sleeve (208).

2. The switch trigger structure for extending density switch points according to claim 1, characterized in that: The bottom of the elastic sensitive component (209) is threadedly connected to the transmission rod (203).

3. The switch trigger structure for extending density switch points according to claim 1, characterized in that: The top head (204) is arranged at a corner of the contact arm (202) and corresponds to the micro switch (205), and the top head (204) and the contact arm (202) are connected by threads.

4. The switch trigger structure for extending density switch points according to claim 1, characterized in that: The plug (204) is cylindrical, and the lower end of the plug (204) is provided with a chamfer.

5. The switch trigger structure for extending density switch points according to claim 1, characterized in that: A guide groove cooperating with the guide rod (201) is provided on the side of the contact arm (202), and the guide rod (201) is inserted into the guide groove.

6. The switch trigger structure for extending density switch points according to claim 1, characterized in that: A gas path connector is provided at the bottom of the lower shell (210).

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