Alternating current capacitor bulging detection device and alternating current capacitor assembly

Abstract

The utility model provides an alternating current capacitor bulging detection device and an alternating current capacitor assembly, relates to the technical field of rail transit, and is used for improving the timeliness and accuracy of bulging detection. The alternating current capacitor bulging detection device comprises two groups of detection assemblies and a fixed support. The two groups of detection assemblies are oppositely arranged, the two groups of detection assemblies are respectively used for detecting deformation conditions of shells at two sides of the alternating current capacitor, each group of detection assemblies comprises at least one detection device, and the detection devices can send out alarm signals. The two groups of detection assemblies are both installed on the fixed support, and the fixed support is provided with a first connecting part used for connecting an alternating current capacitor. The deformation condition of the shell on the two sides of the alternating-current capacitor is detected through the two detection assemblies, so that the bulging condition of the alternating-current capacitor is directly detected through the deformation of the shell, and the timeliness and accuracy of bulging detection are improved.

Description

Technical Field

[0001] The present application relates to the field of rail transportation technology, and in particular to an AC capacitor bulge detection device and an AC capacitor assembly. Background Art

[0002] AC capacitors are widely used in the field of rail transit technology, but they pose safety risks. Especially in high-temperature environments, the internal pressure of the AC capacitor increases, causing the shell of the AC capacitor to expand and deform, resulting in bulging.

[0003] To detect bulging of AC capacitors, a pressure relay with a pressure sampling hole is typically installed. During the self-healing process, the thin film core inside the AC capacitor generates gas, which flows into the sampling hole. When the pressure inside the sampling hole becomes excessive, the pressure relay issues an alarm. Alternatively, a thermistor can be installed on the outside of the AC capacitor housing. When the temperature measured by the thermistor is too high, bulging is detected.

[0004] However, the above AC capacitor bulge detection method has poor timeliness and accuracy. Utility Model Content

[0005] The present application provides an AC capacitor bulge detection device and an AC capacitor assembly for increasing the timeliness and accuracy of bulge detection.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In one aspect, the present application provides an AC capacitor bulge detection device, comprising:

[0008] Two sets of detection components, the two sets of detection components are arranged opposite to each other, the two sets of detection components are respectively used to detect the deformation of the shells on both sides of the AC capacitor, and the two sets of detection components each include at least one detection device, and the detection device can send an alarm signal;

[0009] A fixing bracket, on which the two groups of detection components are mounted, and the fixing bracket has a first connecting portion for connecting to the AC capacitor.

[0010] In a possible implementation, the detection device includes a photoelectric sensor, and the photoelectric sensor is configured to send the alarm signal when the shell of the AC capacitor is deformed to trigger the photoelectric sensor.

[0011] In a possible implementation, the detection device includes a limit switch, and the limit switch is configured to send the alarm signal when the shell of the AC capacitor is deformed and triggers the limit switch.

[0012] In a possible implementation, the alarm signals are all switch values.

[0013] In a possible implementation, the AC capacitor belly bulge detection device further includes an elastic member, wherein the elastic member includes a second connecting portion, a first elastic portion, and a second elastic portion;

[0014] The second connecting portion is used to connect to an AC capacitor, and the top of the first elastic portion and the top of the second elastic portion are both connected to the second connecting portion;

[0015] The first elastic portion and the second elastic portion are respectively used to fit the two opposite sides of the shell of the AC capacitor;

[0016] The two groups of detection components are respectively arranged on the first elastic part and the second elastic part.

[0017] In a possible implementation, the first elastic portion and the second elastic portion are spring sheets, and the two groups of detection components are located at the bottom end of the first elastic portion and the bottom end of the second elastic portion, respectively.

[0018] In a possible implementation, each group of the detection components includes a first detection device and a second detection device, and the first detection device is located outside the second detection device, so that the detection distance of the first detection device is greater than the detection distance of the second detection device.

[0019] In a possible implementation, the AC capacitor belly bulging detection device further includes a plurality of transmission lines, one end of each of the transmission lines is respectively connected to each of the detection devices, and the other ends of the plurality of transmission lines are used to connect to a control unit.

[0020] In a possible implementation, the AC capacitor bulge detection device further includes a plurality of line cards, each of which is clamped and fixed to the transmission line.

[0021] On the other hand, the present application provides an AC capacitor assembly, comprising an AC capacitor and any one of the above-mentioned AC capacitor bulge detection devices;

[0022] The fixing bracket of the AC capacitor bulging detection device is installed on the AC capacitor;

[0023] The AC capacitor comprises a first shell and a second shell which are arranged opposite to each other;

[0024] The two groups of detection components of the AC capacitor bulging detection device are respectively located on the first shell and the second shell to detect the deformation of the first shell and the deformation of the second shell.

[0025] The AC capacitor bulge detection device and AC capacitor assembly provided by this application have the following beneficial effects:

[0026] The AC capacitor bulge detection device and AC capacitor assembly provided in this application are connected to the AC capacitor via a first connection portion on a fixed bracket. Two sets of detection assemblies are mounted on the fixed bracket, allowing the two opposing sets of detection assemblies to be mounted on either side of the AC capacitor housing to detect deformation of the housings on either side of the AC capacitor. Each set of detection assemblies includes at least one detection device. When the detection device detects expansion or deformation of the housings on either side of the AC capacitor, the detection device can issue an alarm signal to indicate bulging of the AC capacitor.

[0027] Compared with the related art, the AC capacitor bulge detection device and AC capacitor assembly provided in this application detect the deformation of the shells on both sides of the AC capacitor through two sets of detection components, thereby directly detecting the bulge of the AC capacitor through the deformation of the shell, so as to increase the timeliness and accuracy of bulge detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of an AC capacitor assembly provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the three-dimensional structure of another AC capacitor assembly provided in an embodiment of the present application;

[0031] Figure 3 A rear view of the AC capacitor assembly provided in an embodiment of the present application in a non-bulging state;

[0032] Figure 4 This is a rear view of the AC capacitor assembly provided in an embodiment of the present application in a bulging state.

[0033] Description of reference numerals:

[0034] 100-AC capacitor bulge detection device;

[0035] 10-Fixed bracket;

[0036] 101-first connecting portion; 11-first main body portion; 12-second main body portion;

[0037] 13- third main body;

[0038] 20-Detection component;

[0039] 21-Detection equipment; 211-First detection equipment; 212-Second detection equipment;

[0040] 30- elastic member;

[0041] 31-second connecting portion; 32-first elastic portion; 33-second elastic portion;

[0042] 40-transmission line;

[0043] 50-line card;

[0044] 200-AC capacitor;

[0045] 201-first mounting portion; 202-second mounting portion; 203-first housing;

[0046] 204-Second shell. DETAILED DESCRIPTION

[0047] In related technologies, bulge detection suffers from technical issues such as poor timeliness and accuracy. This problem arises because, in the solution that incorporates a pressure relay with a collection hole, bulge detection is performed indirectly by measuring the gas pressure generated by the thin film core within the AC capacitor during the transitional self-healing process. However, this gas takes time to flow to the collection hole, resulting in poor timeliness. In the solution that incorporates a thermistor, bulge detection is performed indirectly by measuring temperature, which is prone to false positives and false negatives, resulting in poor detection accuracy.

[0048] In response to the above technical problems, an embodiment of the present application provides an AC capacitor bulge detection device and an AC capacitor assembly, which detects the deformation of the shells on both sides of the AC capacitor through two sets of detection components, thereby directly detecting the bulge of the AC capacitor through the deformation of the shell, thereby increasing the timeliness and accuracy of bulge detection.

[0049] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] like Figure 1 and Figure 2As shown, an embodiment of the present application provides an AC capacitor bulging detection device 100, which is used to detect whether an AC capacitor 200 has a bulging fault. A bulging fault in an AC capacitor 200 occurs when an internal fault in the AC capacitor 200 causes an increase in internal pressure, thereby causing the sides of the AC capacitor 200 to deform and bulge outward.

[0051] AC capacitor 200 can be used in the power supply inverter of a rail transit train. Through the filtering effect of AC capacitor 200, the voltage fluctuation and electromagnetic interference of the power supply inverter output wave are reduced, so that the power supply inverter can provide stable power to the electrical equipment on the rail transit train. It should be noted that the AC capacitor bulge detection device 100 can also be used to detect AC capacitors 200 used in other scenarios.

[0052] like Figure 1 and Figure 2 As shown, the AC capacitor bulge detection device 100 includes a fixed bracket 10 and two sets of detection components 20. The fixed bracket 10 can be a metal bracket, such as a stainless steel bracket. The fixed bracket 10 is used to mount the two sets of detection components 20 on the AC capacitor 200. The fixed bracket 10 has a first connecting portion 101 for connecting to the AC capacitor 200.

[0053] by Figure 1 and Figure 2 As shown in the example, the fixing bracket 10 may include a first main body 11, a second main body 12, and a third main body 13. The first connecting portion 101 may be a first connecting hole provided on the first main body 11. The second main body 12 and the third main body 13 are respectively located on the outside of the housing on both sides of the AC capacitor 200. The housing on both sides of the AC capacitor 200 may be a first housing 203 and a second housing 204, respectively. Two sets of detection assemblies 20 are respectively mounted on the second main body 12 and the third main body 13, so that the two sets of detection assemblies 20 can detect deformation of the housing on both sides of the AC capacitor 200.

[0054] by Figure 1 As shown in the example, first connecting portion 101 can mate with first mounting portion 201 on top of AC capacitor 200 to mount bracket 10 on AC capacitor 200. For example, first mounting portion 201 can be a first mounting plate with a first through-hole. Fixing bracket 10 can be mounted on AC capacitor 200 by inserting a screw through the first connecting hole and the first through-hole, and tightening the screw with a nut.

[0055] Or, Figure 2As shown in the example, first connecting portion 101 can also mate with second mounting portion 202 on the bottom of AC capacitor 200 to mount bracket 10 on AC capacitor 200. For example, second mounting portion 202 can be a second mounting plate with a second through-hole. Fixing bracket 10 can be mounted on AC capacitor 200 by inserting screws sequentially through the first connecting hole and the second through-hole and tightening the screws with nuts.

[0056] By installing the first connecting part 101 in conjunction with the existing first mounting part 201 or second mounting part 202 on the AC capacitor 200, the AC capacitor bulge detection device 100 can be conveniently installed on the current AC capacitor 200, and welding operations can be avoided to reduce damage to the shell of the AC capacitor 200.

[0057] like Figure 1 As shown, two sets of detection assemblies 20 can be respectively disposed on the outside of the housing on both sides of the AC capacitor 200. Both sets of detection assemblies 20 include a detection device 21. When the internal pressure of the AC capacitor 200 increases, causing the housing to expand outward to the detection position of the detection device 21, the detection device 21 is triggered, causing the detection device 21 to emit an alarm signal, indicating that the AC capacitor 200 is bulging, thereby detecting the bulging phenomenon of the AC capacitor 200.

[0058] The AC capacitor bulge detection device 100 provided in the present application detects the deformation of the shells on both sides of the AC capacitor 200 through two relatively arranged groups of detection components 20, thereby directly detecting the bulge of the AC capacitor 200 through the deformation of the shell, thereby increasing the timeliness and accuracy of the bulge detection.

[0059] In some embodiments, the detection device 21 includes a photoelectric sensor. A photoelectric sensor utilizes the photoelectric effect to measure changes in light intensity and convert them into electrical signals. When the housing of the AC capacitor 200 deforms to the point where it triggers the photoelectric sensor, the sensor issues an alarm signal. The photoelectric sensor can be a light-blocking type. When the deformation of the AC capacitor 200 housing obscures the photoelectric sensor's detection position, the sensor issues an alarm signal, indicating that the AC capacitor 200 is bulging.

[0060] The photoelectric sensor can be a high temperature resistant photoelectric switch, so as to be applicable to the AC capacitor 200 under high temperature conditions. In addition, the photoelectric sensor is small in size, which facilitates the installation of the AC capacitor bulge detection device 100 on the AC capacitor 200 in a narrow space.

[0061] In other embodiments, the detection device 21 includes a limit switch, which is also called a travel switch. The limit switch uses the collision of the detected structure to cause its contacts to move to connect or disconnect the control circuit. When the shell of the AC capacitor 200 is deformed to trigger the limit switch, the limit switch sends an alarm signal. For example, the shell of the AC capacitor 200 is deformed to hit the contacts on the limit switch, so that the circuit in the limit switch is turned on, thereby causing the limit switch to send an alarm signal to indicate that the AC capacitor 200 has bulging. The limit switch has the advantage of high accuracy and can be used in AC capacitor bulging detection scenarios with high accuracy requirements.

[0062] In some embodiments, the alarm signals are all switching quantities, which are digital outputs of discontinuous signals, including two values: 0 and 1.

[0063] For example, if the detection device 21 is a photoelectric sensor, when the shell of the AC capacitor 200 is deformed and blocks the detection position of the photoelectric sensor, the alarm signal output value is 1, indicating that the shell is in a bulging state. Conversely, when the shell of the AC capacitor 200 is not deformed and blocks the detection position of the photoelectric sensor, the alarm signal output value is 0, indicating that the shell is not in a bulging state.

[0064] For example, if detection device 21 is a limit switch, and the shell of AC capacitor 200 deforms to the point where it strikes the contacts of the limit switch, the alarm signal output value is 1, indicating that the shell is bulging. Conversely, if the shell of AC capacitor 200 does not deform to the point where it strikes the contacts of the limit switch, the alarm signal output value is 0, indicating that the shell is not bulging. By setting the alarm signal as a switch value, compared to related technologies that use analog values ​​such as temperature data or gas pressure values, the amount of data can be reduced, thereby reducing the amount of processor computation required.

[0065] In some embodiments, as Figure 2 As shown, the AC capacitor bulge detection device 100 further includes an elastic member 30. The elastic member 30 can be an elastic sheet and includes a second connecting portion 31, a first elastic portion 32, and a second elastic portion 33. The second connecting portion 31 can be connected to the first mounting portion 201 on the top of the AC capacitor 200 to mount the elastic member 30 on the AC capacitor 200.

[0066] refer to Figure 2The top of the first elastic portion 32 is connected to the left side of the second connecting portion 31, and the first elastic portion 32 extends from the top cover of the AC capacitor 200 to the bottom of the first housing 203 on the left side of the AC capacitor 200, so that the first elastic portion 32 is attached to the first housing 203 on the left side of the AC capacitor 200. The top of the second elastic portion 33 is connected to the right side of the second connecting portion 31, and the second elastic portion 33 extends from the top cover of the AC capacitor 200 to the bottom of the second housing 204 on the right side of the AC capacitor 200, so that the second elastic portion 33 is attached to the second housing 204 on the right side of the AC capacitor 200.

[0067] Continue to refer Figure 2 The two detection assemblies 20 are respectively mounted on the first elastic portion 32 and the second elastic portion 33. When the shells on both sides of the AC capacitor 200 expand and deform, causing the first elastic portion 32 and the second elastic portion 33 to elastically deform outward, the first elastic portion 32 and the second elastic portion 33 trigger the detection device in the detection assembly 20 to issue an alarm signal, indicating that the AC capacitor 200 is bulging.

[0068] In some embodiments, as Figure 2 As shown, the first elastic portion 32 and the second elastic portion 33 are both spring sheets. Figure 3 and Figure 4 The spring sheet can be deformed along the expansion direction of the shells on both sides of the AC capacitor 200. The two sets of detection components 20 are respectively located at the bottom ends of the first elastic part 32 and the second elastic part 33. Figure 4 As shown, the middle parts of the two side shells of the AC capacitor 200 bulge and deform, driving the first elastic part 32 and the second elastic part 33 to deform outwards.

[0069] In the first elastic part 32 and the second elastic part 33, since the top is fixed by the second connecting part 31, the deformation of the bottom is greater than that of the middle part. Figure 4 As shown in the example, the deformation of the bottom is twice that of the middle, thereby magnifying the bulge size of the AC capacitor 200 and facilitating detection by the two detection assemblies 20 installed at the bottom.

[0070] In some embodiments, as Figure 3 and Figure 4As shown, each detection assembly 20 includes two detection devices 21, and the two detection devices 21 are respectively a first detection device 211 and a second detection device 212. The first detection device 211 and the second detection device 212 are arranged along the bulging direction of the shell of the AC capacitor 200. The first detection device 211 is located on the outside of the second detection device 212, so that the detection distance of the first detection device 211 is greater than the detection distance of the second detection device 212. When the shells on both sides of the AC capacitor 200 expand and deform to the detection distance of the second detection device 212, the second detection device 212 is triggered. When the shells on both sides of the AC capacitor 200 expand and deform to the detection distance of the first detection device 211, the first detection device 211 is triggered.

[0071] When both the first detection device 211 and the second detection device 212 are triggered, the detection component group 20 can be defined as state A. When the second detection device 212 is triggered and the first detection device 211 is not triggered, the detection component group 20 can be defined as state B. When both the first detection device 211 and the second detection device 212 are not triggered, the detection component group 20 can be defined as state C. Whether the AC capacitor 200 is in the bulging state can be determined according to the following table:

[0072] Left detection component Right detection component AC capacitor status A A Severe bloating A B Severe bloating A C The left detection component was accidentally touched B A Severe bloating B B bulging belly B C The left detection component was accidentally touched C A The right detection component was accidentally touched C B The right detection component was accidentally touched C C normal

[0073] Such a setting can increase the reliability of belly bulge detection and avoid false alarms caused by bumps or vibrations of the detection components.

[0074] In some embodiments, as Figure 2 As shown, the AC capacitor bulge detection device 100 further includes a plurality of transmission lines 40, which may be cables. The number of transmission lines 40 matches the number of detection devices 21. The first end of each transmission line 40 is connected to the corresponding detection device 21, and the second end of each transmission line 40 is connected to a control unit to transmit the signal detected by the detection device 21 to the control unit. The control unit then analyzes whether the AC capacitor bulge is present and determines whether to issue an alarm signal.

[0075] In some embodiments, as Figure 2 As shown, the AC capacitor bulge detection device 100 further includes a line clamp 50. There can be multiple line clamps 50. The line clamps 50 are arranged along the extension direction of each transmission line 40 and clamp and secure the transmission line 40. For example, adjacent transmission lines 40 are clamped together, or the transmission line 40 is clamped and secured within a rail transit vehicle. This prevents the transmission line 40 from affecting other equipment within the rail transit vehicle.

[0076] The present application also provides an AC capacitor assembly. Figure 1 and Figure 2As shown, the AC capacitor assembly includes an AC capacitor 200 and the AC capacitor bulge detection device 100 described in any of the above embodiments. The specific structure and related effects of the AC capacitor bulge detection device 100 can refer to the relevant description of the above embodiments.

[0077] The fixing bracket 10 of the AC capacitor bulge detection device 100 is installed on the AC capacitor 200. Figure 1 As shown in the example, the fixing bracket 10 can be installed on the first mounting portion 201 on the top of the AC capacitor 200. Figure 2 As shown in the example, the fixing bracket 10 can also be installed on the second installation portion 202 at the bottom of the AC capacitor 200.

[0078] The AC capacitor 200 has a first shell 203 and a second shell 204 that are arranged opposite to each other. Figure 1 and Figure 2 As shown, the first shell 203 and the second shell 204 may be the left shell and the right shell of the AC capacitor 200 respectively.

[0079] The two detection assemblies 20 of the AC capacitor bulge detection device 100 are located on the first housing 203 and the second housing 204, respectively, to detect deformation of the first housing 203 and the second housing 204. Because this AC capacitor assembly utilizes all the technical solutions of any of the aforementioned embodiments, it possesses at least all the beneficial effects of any of the aforementioned embodiments, and therefore will not be further elaborated here.

[0080] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0081] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0082] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0083] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0084] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An AC capacitor bulge detection device, characterized in that: include: Two groups of detection components (20), the two groups of detection components (20) are arranged opposite to each other, the two groups of detection components (20) are respectively used to detect deformation of the shells on both sides of the AC capacitor (200), and the two groups of detection components (20) each include at least one detection device (21), and the detection device (21) can send an alarm signal; A fixed bracket (10), on which the two groups of detection components (20) are mounted, and the fixed bracket (10) has a first connecting portion (101) for connecting to the AC capacitor (200).

2. The AC capacitor bulge detection device according to claim 1, characterized in that: The detection device (21) comprises a photoelectric sensor, and the photoelectric sensor is configured such that when the shell of the AC capacitor (200) is deformed to trigger the photoelectric sensor, the photoelectric sensor sends the alarm signal.

3. The AC capacitor bulge detection device according to claim 1, characterized in that: The detection device (21) comprises a limit switch, and the limit switch is configured to send the alarm signal when the shell of the AC capacitor (200) is deformed and triggers the limit switch.

4. The AC capacitor belly bulge detection device according to any one of claims 1 to 3, characterized in that: The alarm signals are all switching signals.

5. The AC capacitor belly bulge detection device according to any one of claims 1 to 3, characterized in that: It also includes an elastic member (30), wherein the elastic member (30) includes a second connecting portion (31), a first elastic portion (32) and a second elastic portion (33); The second connecting portion (31) is used to connect to the AC capacitor (200), and the top end of the first elastic portion (32) and the top end of the second elastic portion (33) are both connected to the second connecting portion (31); The first elastic portion (32) and the second elastic portion (33) are respectively used to fit the two opposite sides of the shell of the AC capacitor (200); The two groups of detection components (20) are respectively arranged on the first elastic part (32) and the second elastic part (33).

6. The AC capacitor bulge detection device according to claim 5, characterized in that: The first elastic part (32) and the second elastic part (33) are both spring sheets, and the two groups of detection components (20) are respectively located at the bottom end of the first elastic part (32) and the bottom end of the second elastic part (33).

7. The AC capacitor belly bulge detection device according to any one of claims 1 to 3, characterized in that: Each group of the detection components (20) includes a first detection device (211) and a second detection device (212), wherein the first detection device (211) is located outside the second detection device (212), so that the detection distance of the first detection device (211) is greater than the detection distance of the second detection device (212).

8. The AC capacitor belly bulge detection device according to any one of claims 1 to 3, characterized in that: It also includes a plurality of transmission lines (40), one end of each transmission line (40) is connected to each detection device (21), and the other ends of the plurality of transmission lines (40) are used to connect to a control unit.

9. The AC capacitor bulge detection device according to claim 8, characterized in that: It also includes a line card (50), which is used to clamp and fix the transmission line (40).

10. An AC capacitor assembly, comprising an AC capacitor (200) and the AC capacitor bulge detection device according to any one of claims 1 to 9; The fixing bracket (10) of the AC capacitor bulge detection device is installed on the AC capacitor (200); The AC capacitor (200) comprises a first shell (203) and a second shell (204) arranged opposite to each other; The two groups of detection components (20) of the AC capacitor bulging detection device are respectively located on the first shell (203) and the second shell (204) to detect the deformation of the first shell (203) and the deformation of the second shell (204).

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