Power plant induced draft fan sound and vibration combined measurement device

Abstract

The invention relates to the technical field of power plant induced draft fan detection, in particular to a power plant induced draft fan sound and vibration combined measurement device which comprises a measurement device body, the measurement device body comprises a detection head and a positioning seat, the detection head is detachably arranged at the end of one side of the positioning seat, and a noise sensor is fixed to the end of one side of the positioning seat. A gravity sensor is arranged in the positioning seat, a plurality of elastic films are arranged on the side, close to the gravity sensor, of the detection head and attached to the surface of the gravity sensor, a penetrating groove is formed in the detection head, and the elastic films are located at one end of the penetrating groove and seal the penetrating groove. An air sleeve used for being attached to the outer surface of the induced draft fan is inserted into the other end of the penetrating groove in a sealed mode. Related information of noise is detected through the noise sensor, and for vibration, the impact force, the impact amplitude and the impact frequency in the vibration generation process can be detected through the gravity sensor and a corresponding auxiliary structure.

Description

Technical Field

[0001] The invention relates to the technical field of power plant induced draft fan detection, and in particular to a power plant induced draft fan sound and vibration combined measurement device. Background Art

[0002] In the construction of power plants, in addition to the power generation equipment we usually understand, a series of corresponding auxiliary equipment will also be included, such as power plant induced draft fans, circulating water systems and other corresponding auxiliary equipment used to assist the normal operation of power generation equipment. In order to ensure the normal operation of the power plant, in addition to monitoring the power generation equipment, it is also necessary to monitor these auxiliary equipment synchronously.

[0003] Among them, the detection of induced draft fans in power plants is usually carried out in two directions: noise and vibration. The conventional method is through noise sensors and displacement sensors. The noise sensor receives noise information during the operation of the induced draft fan, while the displacement sensor determines its vibration frequency and vibration amplitude by detecting the displacement of the induced draft fan. Although the displacement sensor can detect the vibration amplitude and vibration frequency, the induced draft fan has an outer shell and a corresponding supporting structure. When it is displaced, the impact force generated cannot be detected by the displacement sensor. Therefore, to address this problem, it is necessary to design a sound and vibration combined measurement device for induced draft fans in power plants to simultaneously detect the information parameters of sound and vibration. Summary of the invention

[0004] The present invention aims at the deficiencies in the prior art and provides the following technical solutions:

[0005] A combined sound and vibration measuring device for induced draft fans in power plants comprises a measuring device body, wherein the measuring device body comprises a detection head and a positioning seat.

[0006] Specifically, the detection head is detachably arranged on one side end of the positioning seat, a noise sensor is fixed on one side end of the positioning seat, a gravity sensor is arranged inside the positioning seat, and a plurality of elastic membranes are arranged on the side of the detection head close to the gravity sensor, the elastic membrane fits the surface of the gravity sensor, a through groove is provided in the detection head, the elastic membrane is located at one end of the through groove and closes the through groove, and an air sleeve for fitting the outer surface of the induced draft fan is sealed and inserted into the other end of the through groove. When the induced draft fan vibrates, the air sleeve squeezes the airflow inside the through groove to form pressure to push the elastic membrane to deform and hit the surface of the gravity sensor.

[0007] As an improvement of the above technical solution, it includes: an adjusting arm, which includes arm one and arm two, one end of arm one is connected to a rotating shaft at one end of arm two, one end of arm one is integrally formed with a measuring device body, and the other end of arm two is connected to a track frame.

[0008] As an improvement of the above technical solution, a track groove is provided on the upper end surface of the track frame, a slider is inserted into the track groove, a lead screw is inserted into one side of the track frame, the lead screw thread passes through the slider, and the second support arm is connected to the slider shaft.

[0009] As an improvement of the above technical solution, a mounting seat is integrally formed on the upper end surface of the slider, the end of the second support arm is inserted into the internal rotating shaft of the mounting seat for connection, and nuts are threadedly connected on both sides of the rotating shaft.

[0010] As an improvement of the above technical solution, one side of the track groove passes through the track frame, and a blocking plate is provided on the track frame on the side where the track groove passes through. One end of the lead screw passes into the interior of the blocking plate and is connected to the blocking plate through a bearing.

[0011] As an improvement of the above technical solution, an installation groove and a positioning groove are opened on one side of the positioning seat, the positioning groove is located at the center of the positioning seat, the installation groove is located on the outside of the positioning groove, and the installation groove is in a circular ring shape, and the noise sensor is arranged inside the installation groove.

[0012] As an improvement of the above technical solution, the number of the noise sensors is several and distributed in a ring shape inside the mounting groove. The interior of the mounting groove is provided with slots having the same number as the noise sensors. The noise sensors are inserted into the slots, and a protective rubber film is provided at the opening of the mounting groove.

[0013] As an improvement of the above technical solution, the detection head includes a limit seat and a rubber sleeve. The through groove passes through both sides of the limit seat. The rubber sleeve is adhered to one side of the limit seat. The elastic membrane is integrally formed on the side of the rubber sleeve close to the gravity sensor and covers one end of the through groove. The air sleeve is inserted into the other end of the through groove to form a closed cavity inside the through groove.

[0014] As an improvement of the above technical solution, a limiting member is detachably fixed on the side of the limiting seat away from the rubber sleeve. The limiting member is used to limit the displacement of the air sleeve to prevent the air sleeve from falling from the through groove. The air sleeve can move linearly along the central axis of the through groove.

[0015] As an improvement of the above technical solution, the limiting member includes a positioning cover, which is detachably fixed to the side of the limiting seat away from the rubber sleeve, and the surface of the positioning cover is provided with a penetrating limiting groove, the inner diameter of the limiting groove is smaller than the inner diameter of the penetrating groove, the inner wall of the limiting groove fits in with the outer surface of the air sleeve, and the other end of the air sleeve is integrally formed with a limiting ring, and the inner wall of the penetrating groove fits in with the outer surface of the limiting ring.

[0016] As an improvement of the above technical solution, the positioning cover is threadedly connected to one end of the limiting seat away from the rubber sleeve. When the positioning cover is tightened, the limiting groove and the through groove are in a concentric arrangement.

[0017] Beneficial effects of the present invention:

[0018] Noise-related information is detected through noise sensors, and for vibration, the impact force, impact amplitude and impact frequency in the process of vibration can be detected through gravity sensors and corresponding auxiliary structures. Compared with displacement sensors, more parameters can be detected and fewer structures are required. It has better detection effect in detecting vibration information and has a more comprehensive application range than existing technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 It is an exploded structural diagram of the measuring device body of the present invention;

[0021] Figure 3 for Figure 2 The enlarged structure diagram at A in the middle;

[0022] Figure 4 is a side view of the present invention;

[0023] Figure 5 for Figure 4 Isometric section view at the middle BB;

[0024] Figure 6 for Figure 5 Enlarged structural diagram of point B in the middle.

[0025] Figure numerals: 10, track frame; 11, track groove; 12, slider; 121, mounting seat; 122, nut; 13, screw; 14, baffle; 20, measuring device; 21, detection head; 211, limit seat; 212, through groove; 213, air sleeve; 214, limit ring; 215, positioning cover; 216, limit groove; 217, rubber sleeve; 218, elastic membrane; 22, positioning seat; 221, mounting groove; 222, positioning groove; 223, noise sensor; 224, gravity sensor; 30, adjustment arm; 31, support arm one; 32, support arm two. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] The detection of the induced draft fan of a power plant is usually carried out in two directions: noise and vibration. The conventional method is to use a noise sensor and a displacement sensor. The noise sensor receives the noise information during the operation of the induced draft fan, while the displacement sensor determines its vibration frequency and vibration amplitude by detecting the displacement of the induced draft fan. Although the displacement sensor can detect the vibration amplitude and vibration frequency, the induced draft fan has a shell and a corresponding supporting structure. When the induced draft fan is displaced, the impact force generated cannot be detected by the displacement sensor. Therefore, in view of this problem, the following embodiments are provided:

[0028] See also Figures 1 to 3 , a combined sound and vibration measuring device for an induced draft fan in a power plant is provided, comprising: a measuring device body 20 , wherein the measuring device body 20 comprises a detection head 21 and a positioning seat 22 .

[0029] Specifically, the detection head 21 is detachably arranged on one side end of the positioning seat 22, a noise sensor 223 is fixed on one side end of the positioning seat 22, a gravity sensor 224 is arranged inside the positioning seat 22, and a plurality of elastic membranes 218 are arranged on one side of the detection head 21 close to the gravity sensor 224, the elastic membrane 218 fits the surface of the gravity sensor 224, a through groove 212 is provided inside the detection head 21, the elastic membrane 218 is located at one end of the through groove 212 and closes the through groove 212, and an air sleeve 213 for fitting the outer surface of the induced draft fan is sealed and inserted into the other end of the through groove 212. When the induced draft fan vibrates, the air sleeve 213 squeezes the air flow inside the through groove 212 to form pressure to push the elastic membrane 218 to deform and hit the surface of the gravity sensor 224.

[0030] When in use, the entire measuring device body 20 can be installed on the frame of the induced draft fan through auxiliary structures such as bolts, brackets, and straps, and the air sleeve 213 on the detection head 21 can be fitted against the surface of the induced draft fan. When the induced draft fan vibrates, the vibrating induced draft fan will push the detection head 21 to move, and the changed position of the detection head 21 will squeeze the airflow inward, thereby giving a pressure to the elastic membrane 218, and this pressure will be directly transmitted to the gravity sensor 224. The gravity intensity sensed by the gravity sensor 224 is the amplitude of vibration, and the interval between two gravity changes on the gravity sensor 224 is the vibration frequency, and the displacement of the vibration is the moving distance of the air sleeve 213. The three vibration data can be fully detected, and the monitoring effect is more comprehensive than the detection of the displacement sensor.

[0031] In the embodiment, it is usually fixed by other auxiliary equipment. In order to more conveniently fix the measuring device body 20, please refer to Figure 1 , and also includes: an adjusting arm 30, the adjusting arm 30 includes a support arm 1 31 and a support arm 2 32, one end of the support arm 1 31 is connected to a rotating shaft at one end of the support arm 2 32, one end of the support arm 1 31 is integrally formed with the measuring device body 20, and the other end of the support arm 2 32 is connected to the track frame 10.

[0032] A foldable adjustment structure is formed by the cooperation between support arm 1 31 and support arm 2 32. The position of the end of the air sleeve 213 is adjusted according to the installation points at different positions. According to the different structures of the induced draft fan, the adjustment arm 30 can also have more support arms. The track frame 10 at the bottom is used to adjust the position of the entire adjustment arm 30, thereby increasing the adjustment range of the overall position.

[0033] For further information, see Figure 1 The upper end surface of the track frame 10 is provided with a track groove 11, and a slider 12 is inserted into the track groove 11. A lead screw 13 is inserted into one side of the track frame 10. The lead screw 13 threadably penetrates the slider 12, and the support arm 32 is connected to the rotating shaft of the slider 12.

[0034] The movement of the slider 12 is driven by the rotation of the lead screw 13, thereby realizing the function of adjusting the linear position of the entire measuring device body 20, wherein the lead screw 13 can be rotated manually or driven by a motor. The manual rotation method requires additional nuts for positioning, while the motor drive method requires a motor with a self-locking function.

[0035] In one embodiment, see Figure 1 The upper end surface of the slider 12 is integrally formed with a mounting seat 121, the end of the support arm 32 is inserted into the internal shaft of the mounting seat 121 for connection, and nuts 122 are threadedly connected on both sides of the shaft.

[0036] The connection between the second arm 32 and the mounting seat 121 is fixed by the nut 122, and similarly, the connection between the first arm 31 and the second arm 32 also needs to be fixed with the nut 122, so as to ensure that after each adjustment, the adjusted position can be fixed by tightening the nut 122.

[0037] In order to ensure the disassembly function of the track frame 10 and facilitate the later maintenance, please refer to Figure 1 One side of the track groove 11 passes through the track frame 10, and a blocking plate 14 is provided on the track frame 10 at the side where the track groove 11 passes through. One end of the lead screw 13 penetrates into the interior of the blocking plate 14 and is connected to the blocking plate 14 through a bearing.

[0038] By setting the blocking plate 14, one side of the track groove 11 can remain open. When the slider 12 inside needs to be disassembled, the blocking plate 14 can be directly removed, and the blocking plate 14 can be fixed by bolts.

[0039] In order to ensure that the noise sensor 223 can receive the transmission of noise more comprehensively and avoid the installation of the gravity sensor 224, please refer to Figure 2 and Figure 3 A mounting groove 221 and a positioning groove 222 are provided on one side of the positioning seat 22 . The positioning groove 222 is located at the center of the positioning seat 22 . The mounting groove 221 is located on the outside of the positioning groove 222 . The mounting groove 221 is in a circular shape. The noise sensor 223 is arranged inside the mounting groove 221 .

[0040] The noise sensor 223 is arranged in a ring-shaped manner on the outside of the gravity sensor 224, so that the disassembly and installation of the gravity sensor 224 will not directly affect the noise sensor 223, which makes the subsequent disassembly and installation operations more convenient.

[0041] As an improvement of the above technical solution, the number of noise sensors 223 is several and they are distributed in a ring shape inside the mounting groove 221. The mounting groove 221 is provided with slots having the same number as the noise sensors 223. The noise sensors 223 are inserted into the slots and a protective rubber film is provided at the opening of the mounting groove 221.

[0042] In this way, a uniform annular distribution can be formed by combining multiple noise sensors 223, thereby ensuring the stability and accuracy of noise reception at each position.

[0043] In order to further improve the internal structure of the detection head 21, please refer to Figures 2 to 6The detection head 21 includes a limit seat 211 and a rubber sleeve 217. The through groove 212 penetrates both sides of the limit seat 211. The rubber sleeve 217 is adhered to one side of the limit seat 211. The elastic membrane 218 is integrally formed on the side of the rubber sleeve 217 close to the gravity sensor 224 and covers one end of the through groove 212. The air sleeve 213 is inserted into the other end of the through groove 212 to form a closed cavity located inside the through groove 212.

[0044] That is, the detection head 21 is a structure formed by a limited seat 211, a rubber sleeve 217 and an air sleeve 213, and its tail is closed by an elastic membrane 218, forming an internally closed air cavity structure. When external extrusion occurs, the air flow cannot flow out, which will form inward extrusion, and the elastic membrane 218 that is easily deformed will form inward pressure, thereby forming an extrusion on the gravity sensor 224, thereby realizing the vibration detection function.

[0045] In the above solution, the sealing property and the fixed position limiting function of the gas sleeve 213 cannot be guaranteed. In order to further improve the solution, please refer to Figures 2 to 6 Specifically, a limiting member is detachably fixed on one side of the limiting seat 211 away from the rubber sleeve 217 , and the limiting member is used to limit the displacement of the air sleeve 213 to prevent the air sleeve 213 from falling from the through groove 212 , and the air sleeve 213 can move in a straight line along the central axis of the through groove 212 .

[0046] The position of the air sleeve 213 is limited by the stopper alone, so as to ensure that the air sleeve 213 can move linearly inside the through slot 212 while avoiding the problem of falling. Specifically, in order to implement the above solution, please refer to Figure 2 and Figure 6 The limiting member includes a positioning cover 215, which is detachably fixed to a side of the limiting seat 211 away from the rubber sleeve 217. A penetrating limiting groove 216 is provided on the surface of the positioning cover 215. The inner diameter of the limiting groove 216 is smaller than the inner diameter of the penetrating groove 212. The inner wall of the limiting groove 216 fits the outer surface of the air sleeve 213. A limiting ring 214 is integrally formed at the other end of the air sleeve 213, and the inner wall of the penetrating groove 212 fits the outer surface of the limiting ring 214.

[0047] The maximum moving position of the other side of the air sleeve 213 is determined by the positioning cover 215, and the internal moving distance is based on the through groove 212. When the air sleeve 213 is squeezed, downward pressure is generated. When the air sleeve 213 moves outward, the limit ring 214 restricts it from moving to the outside of the positioning cover 215, thereby ensuring the stability of the structure.

[0048] In addition, the morphological structure of the air sleeve 213 is as follows Figure 6 and Figure 3 As shown, it is a hard structure similar to a test tube, and the air sleeve 213 itself does not deform.

[0049] In one embodiment, the positioning cover 215 is threadedly connected to one end of the limiting seat 211 away from the rubber sleeve 217 . When the positioning cover 215 is tightened, the limiting groove 216 and the through groove 212 are in a concentric arrangement.

[0050] The positioning cover 215 is provided with threads to facilitate subsequent connection and installation, and is more convenient to use.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A combined sound and vibration measuring device for induced draft fans in power plants, characterized in that: include: A measuring device body (20), wherein the measuring device body (20) comprises a detection head (21) and a positioning seat (22); The detection head (21) is detachably arranged at one end of the positioning seat (22); a noise sensor (223) is fixed at one end of the positioning seat (22); a gravity sensor (224) is arranged inside the positioning seat (22); a plurality of elastic membranes (218) are arranged on one side of the detection head (21) close to the gravity sensor (224); the elastic membranes (218) are fitted to the surface of the gravity sensor (224); a through groove (212) is provided inside the detection head (21); the elastic membrane (218) is located at one end of the through groove (212) and closes the through groove (212); an air sleeve (213) for fitting to the outer surface of the induced draft fan is sealed and inserted into the other end of the through groove (212); When the induced draft fan vibrates, the air sleeve (213) squeezes the airflow passing through the interior of the slot (212) to form pressure to push the elastic membrane (218) to deform and hit the surface of the gravity sensor (224).

2. A combined sound and vibration measuring device for induced draft fans in power plants according to claim 1, characterized in that: include: Adjustment arm (30); The adjusting arm (30) comprises a first support arm (31) and a second support arm (32); one end of the first support arm (31) is connected to a rotating shaft at one end of the second support arm (32); one end of the first support arm (31) is integrally formed with a measuring device body (20); and the other end of the second support arm (32) is connected to a track frame (10).

3. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 2, characterized in that: The upper end surface of the track frame (10) is provided with a track groove (11), a slider (12) is inserted into the track groove (11), a lead screw (13) is inserted into one side of the track frame (10), the lead screw (13) is threadedly passed through the slider (12), and the second support arm (32) is connected to the rotating shaft of the slider (12).

4. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 3 is characterized in that: The upper end surface of the slider (12) is integrally formed with a mounting seat (121), the end of the second support arm (32) is inserted into the internal rotating shaft of the mounting seat (121) for connection, and nuts (122) are threadedly connected on both sides of the rotating shaft.

5. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 3 is characterized by: One side of the track groove (11) passes through the track frame (10), and a blocking plate (14) is provided on the track frame (10) at the side through which the track groove (11) passes, and one end of the lead screw (13) passes through the interior of the blocking plate (14) and is connected to the blocking plate (14) via a bearing.

6. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 1, characterized in that: A mounting groove (221) and a positioning groove (222) are provided on one side of the positioning seat (22); the positioning groove (222) is located at the center of the positioning seat (22); the mounting groove (221) is located outside the positioning groove (222); the mounting groove (221) is in a circular ring shape; and the noise sensor (223) is arranged inside the mounting groove (221).

7. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 6, characterized in that: The number of the noise sensors (223) is several and they are distributed in a ring shape inside the installation groove (221); the installation groove (221) is provided with slots having the same number as the number of the noise sensors (223); the noise sensors (223) are inserted into the slots; and a protective rubber film is provided at the opening of the installation groove (221).

8. A combined sound and vibration measuring device for induced draft fans in power plants according to any one of claims 1 to 7, characterized in that: The detection head (21) comprises a limit seat (211) and a rubber sleeve (217); the through groove (212) penetrates both sides of the limit seat (211); the rubber sleeve (217) is adhered to one side of the limit seat (211); the elastic membrane (218) is integrally formed on a side of the rubber sleeve (217) close to the gravity sensor (224) and covers one end of the through groove (212); the air sleeve (213) is inserted into the other end of the through groove (212) to form a closed cavity located inside the through groove (212).

9. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 8, characterized in that: A limiting member is detachably fixed to a side of the limiting seat (211) away from the rubber sleeve (217), and the limiting member is used to limit the displacement of the air sleeve (213) to prevent the air sleeve (213) from falling out of the through groove (212). The air sleeve (213) can move linearly along the central axis of the through groove (212).

10. The device for combining sound and vibration measurement of induced draft fans in power plants according to claim 9, characterized in that: The limiting member comprises a positioning cover (215), the positioning cover (215) is detachably fixed to a side of the limiting seat (211) away from the rubber sleeve (217), a penetrating limiting groove (216) is provided on the surface of the positioning cover (215), the inner diameter of the limiting groove (216) is smaller than the inner diameter of the penetrating groove (212), the inner wall of the limiting groove (216) fits the outer surface of the air sleeve (213), the other end of the air sleeve (213) is integrally formed with a limiting ring (214), and the inner wall of the penetrating groove (212) fits the outer surface of the limiting ring (214).

11. A combined sound and vibration measuring device for induced draft fans in power plants according to claim 10, characterized in that: The positioning cover (215) is threadedly connected to one end of the limiting seat (211) away from the rubber sleeve (217). When the positioning cover (215) is tightened, the limiting groove (216) and the through groove (212) are in a concentric arrangement.

Images