Bolt stress monitoring device for turbine top cover

Abstract

This utility model discloses a stress monitoring device for turbine top cover bolts, comprising a housing, a contactor, and a bearing. The contactor extends into the housing until it abuts against one end of the bearing. A circuit board is built into the housing, sleeved on the bearing with a gap between them. A compression spring, multiple positioning pins, and multiple positioning balls are also built into the housing. One end of the compression spring abuts against the housing, and the other end abuts against the other end of the bearing. The multiple positioning pins are distributed around the bearing and fixedly connected to it, and the multiple positioning balls are distributed around the circuit board and fixedly connected to it. The positioning pins and positioning balls are in point contact. The advantage of this turbine top cover bolt stress monitoring device is that it can maintain circuit continuity when the turbine top cover bolt stress is in a steady state, and will not maintain circuit continuity during disturbances, thereby reliably monitoring changes in bolt stress state.

Description

Technical Field

[0001] This utility model belongs to the field of turbine unit monitoring, and specifically relates to a turbine top cover bolt stress monitoring device. Background Technology

[0002] The utility model patent with publication number CN221350359U and subject name is "Power Turbine Top Cover Bolt Force Monitoring Device". Its IPC classification number is G01L5 / 24. The technical solution disclosed is that "the power turbine top cover bolt force monitoring device selects the corresponding fiber optic grating sensor according to the top cover bolt model. The fiber optic grating sensor is installed in the central hole of four hollow top cover bolts and the top cover bolts are reinstalled normally. The control circuit consists of a front-end fiber optic grating sensor, an optical fiber communication transmission line, a fiber optic grating demodulator and a local server".

[0003] Therefore, the above utility model patents have disclosed one technical solution for a turbine top cover bolt stress monitoring device. However, the technical solution disclosed in these utility model patents focuses on calculating and evaluating the fatigue life of the top cover bolts after a period of data collection, guiding the replacement cycle of the top cover bolts during power station maintenance. It does not further address the issues of maintaining circuit continuity when the turbine top cover bolts are in a steady-state stress state, and failing to maintain circuit continuity during disturbances. Further improvements are needed. Utility Model Content

[0004] This utility model addresses the shortcomings of the existing technology by providing a stress monitoring device for turbine top cover bolts.

[0005] This utility model adopts the following technical solution: a stress monitoring device for turbine top cover bolts, comprising: Housing, contactor, and bearing; the contactor extends into the housing until it abuts against one end of the bearing. A circuit board built into the housing, which is fitted onto the bearing with a gap between them; The device includes a compression spring, multiple positioning pins, and multiple positioning balls embedded in the outer casing. One end of the compression spring abuts against the outer casing, and the other end of the compression spring abuts against the other end of the bearing. Multiple positioning pins are distributed around the bearing and are fixedly connected to the bearing respectively. Multiple positioning balls are distributed around the circuit board and are fixedly connected to the circuit board respectively. The positioning pins and positioning balls are in point contact.

[0006] As a preferred technical solution to the above technical solutions, the turbine top cover bolt stress monitoring device also includes a buffer component built into the outer shell. The buffer component is sleeved on the bearing and has a gap between it and the bearing. The circuit board is embedded in the buffer component.

[0007] As a preferred technical solution to the above technical solutions, the turbine top cover bolt stress monitoring device also includes multiple buffer screws, which are distributed around the buffer and fixedly connected to the buffer respectively, and the buffer screws are further fixedly connected to the outer shell.

[0008] As a preferred technical solution of the above technical solution, the circuit board is provided with a circuit board body, the circuit board body has multiple circuit board recesses, the buffer is provided with a buffer body, the buffer body has multiple buffer protrusions, and the buffer protrusions are embedded in the circuit board recesses.

[0009] As a preferred technical solution to the above technical solutions, the circuit board body has multiple circuit board grooves, and the positioning ball is embedded in the circuit board groove.

[0010] The turbine top cover bolt stress monitoring device disclosed in this utility model has the advantage that the positioning pin and the positioning ball are in point contact. Under the buffering effect of the buffer, the circuit can be maintained when the stress of the turbine top cover bolt is in a steady state, and the circuit can no longer be maintained when disturbed, thereby reliably monitoring the changes in bolt stress state. Attached Figure Description

[0011] Figure 1 This is a perspective view of this application.

[0012] Figure 2 This is a three-dimensional view from another perspective of this application.

[0013] Figure 3 This is a perspective view of the combined structure of the circuit board and buffer component of this application.

[0014] Figure 4 This is a perspective view of the circuit board of this application.

[0015] Figure 5 This is a perspective view of the buffer component of this application.

[0016] Figure 6 Is Figure 1 A schematic diagram with the casing and bracket removed from the original design.

[0017] Figure 7 Is Figure 2 A schematic diagram with the casing and bracket removed from the original design.

[0018] Figure 8 yes Figure 6 A magnified view of a portion of region A.

[0019] Figure 9 yes Figure 7 A magnified view of a portion of region B.

[0020] The reference numerals in the attached drawings include: 100-housing; 200-contactor; 300-circuit board; 310-circuit board body; 320-circuit board recess; 330-circuit board groove; 400-buffer; 410-buffer screw; 420-buffer body; 430-buffer protrusion; 510-bearing; 520-compression spring; 530-locating pin; 540-locating ball; 550-wire. Detailed Implementation

[0021] This utility model discloses a stress monitoring device for the top cover bolts of a water turbine. The following description, in conjunction with a preferred embodiment (Embodiment 1), is shown in the accompanying drawings. Figures 1 to 9 The specific embodiments of this utility model will be further described below.

[0022] See attached diagram. Figures 1 to 9 , Figure 1 and Figure 2 The turbine top cover bolt stress monitoring device is shown from different perspectives. Figure 3 The combined structure of the circuit board and the buffer is shown. Figure 4 The circuit board is shown. Figure 5 The buffer element is shown. Figure 6 and Figure 7 The following images show partial structures of the turbine top cover bolt stress monitoring device from different perspectives. Figure 8 and Figure 9 The partial structures of the turbine top cover bolt stress monitoring device are shown.

[0023] Example 1.

[0024] Preferably, the turbine top cover bolt stress monitoring device includes: The housing 100, contactor 200, and bearing 510 are provided. One end of the contactor 200 extends into the housing 100 until it abuts against one end of the bearing 510, so that the other end of the contactor 200 abuts against the turbine top cover bolts, etc., where stress monitoring is required. A circuit board 300 is built into the housing 100, and the circuit board 300 is sleeved on the bearing 510 with a gap between them; Built into the housing 100 are a compression spring 520, multiple positioning pins 530, and multiple positioning balls 540. One end of the compression spring 520 abuts against the inner surface of the housing 100, and the other end of the compression spring 520 abuts against the other end of the bearing 510. The multiple positioning pins 530 are distributed around the bearing 510 and are fixedly connected to it. The multiple positioning balls 540 are distributed around the circuit board 300 and are fixedly connected to it. There is point contact between the positioning pins 530 and the positioning balls 540. This ensures that in a steady state (when the contactor 200 is subjected to external forces such as the turbine top cover bolts), a continuous and stable axial force is applied to the bearing 510 and the compression spring 520. (With force), the positioning pin 530 and the positioning ball 540 maintain continuous point contact, which is equivalent to the contact circuit of the circuit board 300 remaining conductive. Under disturbance conditions (the contactor 200 is subjected to external forces such as the turbine top cover bolts, which apply intermittent or unstable axial forces to the bearing 510 and the compression spring 520), the compression spring 520 is compressed, causing the bearing 510 to generate axial displacement, which in turn drives the positioning pin 530 to generate axial displacement, so that the positioning pin 530 and the positioning ball 540 no longer maintain point contact, which is equivalent to the contact circuit of the circuit board 300 no longer being conductive. Based on whether the contact circuit of the circuit board 300 is conductive, it can be known whether the turbine top cover bolts are in a steady state or a disturbance state.

[0025] The turbine top cover bolt stress monitoring device also includes a buffer 400 built into the outer casing 100. The buffer 400 is sleeved on the bearing 510 and has a gap between it and the bearing 510. The circuit board 300 is embedded in the buffer 400. The circuit board 300 and the buffer 400 form a combined structure. This combined structure does not directly contact the bearing 510 physically. Instead, the axial force applied to the bearing 510 by the contactor 200 is indirectly transmitted to the circuit board 300 through the positioning pin 530 and the positioning ball 540.

[0026] The turbine top cover bolt stress monitoring device also includes multiple buffer screws 410, which are distributed around the buffer 400 and fixedly connected to the buffer 400. The buffer screws 410 are further fixedly connected to the inner surface of the outer shell 100. This ensures that there is no axial displacement between the buffer 400 and the outer shell 100, regardless of whether the state is steady or disturbed. Consequently, there is no axial displacement between the circuit board 300 embedded in the buffer 400 and the outer shell 100, regardless of whether the state is steady or disturbed. This improves the reliability of whether the contact circuit of the circuit board 300 is conductive.

[0027] The circuit board 300 is provided with a circuit board body 310, which has multiple circuit board recesses 320. The buffer 400 is provided with a buffer body 420, which has multiple buffer protrusions 430. The buffer protrusions 430 are embedded in the circuit board recesses 320, so that the circuit board 300 is embedded in the buffer 400, and the circuit board 300 and the buffer 400 form a combined structure.

[0028] The circuit board body 310 has multiple circuit board grooves 330, and the positioning balls 540 are embedded in the circuit board grooves 330, so that the multiple positioning balls 540 are distributed around the circuit board 300 and are fixedly connected to the circuit board 300 respectively.

[0029] The turbine top cover bolt stress monitoring device also includes two wires 550. One end of the wire 550 extends into the housing 100 until it is electrically connected to the circuit board 300, and the other end of the wire 550 extends out of the housing 100 until it is electrically connected to an external device (not shown in the figure).

[0030] It is worth mentioning that the specific circuit structure and other technical features of the circuit board 300 involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control methods and spatial arrangement of these technical features can be conventionally selected in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.

[0031] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for monitoring the stress of turbine top cover bolts, characterized in that, include: Housing, contactor, and bearing; the contactor extends into the housing until it abuts against one end of the bearing. A circuit board built into the housing, which is fitted onto the bearing with a gap between them; The device includes a compression spring, multiple positioning pins, and multiple positioning balls embedded in the outer casing. One end of the compression spring abuts against the outer casing, and the other end of the compression spring abuts against the other end of the bearing. Multiple positioning pins are distributed around the bearing and are fixedly connected to the bearing respectively. Multiple positioning balls are distributed around the circuit board and are fixedly connected to the circuit board respectively. The positioning pins and positioning balls are in point contact.

2. The turbine top cover bolt stress monitoring device according to claim 1, characterized in that, The turbine top cover bolt stress monitoring device also includes a buffer component built into the outer shell. The buffer component is sleeved on the bearing and has a gap between it and the bearing. The circuit board is embedded in the buffer component.

3. The turbine top cover bolt stress monitoring device according to claim 2, characterized in that, The turbine top cover bolt stress monitoring device also includes multiple buffer screws, which are distributed around the buffer and fixedly connected to the buffer respectively. The buffer screws are further fixedly connected to the outer shell.

4. The turbine top cover bolt stress monitoring device according to claim 2, characterized in that, The circuit board has a circuit board body with multiple circuit board recesses, and the buffer has a buffer body with multiple buffer protrusions. The buffer protrusions are embedded in the circuit board recesses.

5. The turbine top cover bolt stress monitoring device according to claim 4, characterized in that, The circuit board body has multiple circuit board grooves, and the positioning ball is embedded in the circuit board groove.

Images