Pressure stabilizing mechanism and pressure sensor

Abstract

The utility model discloses a pressure stabilizing mechanism and a pressure sensor, and relates to the pressure sensing technology field, the pressure stabilizing mechanism comprises a conduction part and a control part, the conduction part comprises a fixing part, a buffer assembly and a contact rod, the fixing part comprises a fixing frame, the fixing frame is provided with a circular groove convenient for the buffer assembly and the contact rod to penetrate through, and the control part is arranged in the circular groove. The contact rod can slide up and down along the circular groove, and the pressure sensor is placed on the buffer assembly. The buffer assembly comprises a touch rod and a U-shaped pipe, the touch rod and the contact rod are slidably connected with the two ends of the U-shaped pipe respectively, the U-shaped pipe is filled with a solution, and a fixing ring used for fixing the buffer assembly and the U-shaped pipe is arranged in the fixing frame; the control component comprises a transmission assembly, a rotating assembly and a brake assembly. According to the utility model, the pressure and the fluctuation of the pressure cannot directly influence the pressure sensor, and the pressure sensor is adaptive to different pressure ranges, so that the precision requirement of pressure measurement can be met when the pressure sensor is mounted at different parts.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensing, in particular to a pressure stabilizing mechanism and a pressure sensor. Background Art

[0002] Stability and efficiency are important indicators of the operating status of a hydro-turbine generator. The pressure distribution within the volute has a significant impact on the performance and efficiency of the entire unit. Accurately measuring the pressure within the volute can provide information about water flow and energy conversion. The pressure and pressure fluctuations in the draft tube of a Francis unit have a significant impact on the vibration of the turbine. Vibration is an important parameter that indicates whether the operation of a hydro-turbine generator is stable. Therefore, in the actual operation of a hydro-turbine generator unit, the pressure measurement accuracy requirements in the volute and draft tube are also high. During operation, a hydro-turbine generator may deviate from the optimal operating conditions. In particular, during load regulation, uneven water flow at the runner inlet, poor flow around the blades, and unstable water flow at the runner outlet may occur, causing increased pressure pulsation. Alternatively, unstable opening of the turbine guide vanes can also lead to uneven water flow entering the runner, resulting in uneven force on the runner blades, causing runner vibration and increased pressure pulsation, thereby affecting the accuracy of pressure measurement and increasing measurement errors. Based on this, a pressure stabilizing mechanism and a pressure sensor are designed. The pressure stabilizing mechanism prevents the pressure and pressure fluctuations from directly affecting the pressure sensor. At the same time, the adaptability to different pressure ranges improves the accuracy of pressure measurement, so as to meet the accuracy requirements of pressure measurement when the pressure stabilizing mechanism is installed in different parts. Utility Model Content

[0003] The purpose of the present utility model is to overcome the shortcomings of the existing technology and provide a pressure stabilizing mechanism and a pressure sensor. Through the design of the conducting component, the touch rod will not directly damage the pressure sensor. Through the design of the brake assembly in the control component, it can be locked when the touch rod moves too fast. Through the cooperation of the transmission assembly, the rotating assembly and the reset assembly, the brake assembly can be realized, thus preventing the pressure sensor from being directly damaged when the pressure is too high.

[0004] The purpose of the present utility model is achieved through the following technical solutions: a voltage stabilizing mechanism and a pressure sensor, comprising a voltage stabilizing mechanism and a pressure sensor, the voltage stabilizing mechanism comprising a conduction component and a control component, the conduction component comprising a fixing member, a buffer assembly and a contact rod, the buffer assembly and the contact rod are partially penetrated into the fixing member, the fixing member comprises a fixing frame, the top of the fixing frame is provided with a circular groove for facilitating the penetration of the buffer assembly and the contact rod, and the contact rod can slide up and down along the circular groove, and the pressure sensor is placed on the buffer assembly.

[0005] The buffer assembly includes a touch rod and a U-shaped tube arranged inside a fixed frame. The touch rod is slidably connected to one end of the U-shaped tube, and the contact rod is slidably connected to the other end of the U-shaped tube. The U-shaped tube is filled with a solution, and a fixing ring for fixing the buffer assembly and the U-shaped tube is provided inside the fixed frame.

[0006] The control component includes a transmission assembly, a rotating assembly and a brake assembly. The transmission assembly includes a connecting rod, a rack, a gear and a rotating shaft. The connecting rod is arranged on the side of the touch rod and fixed thereto, and the rack is arranged on the connecting rod.

[0007] The rotating assembly includes a rotating disk and a fixed shaft. The fixed shaft is arranged on the rotating disk. The rotating disk and the gear are sequentially sleeved on the outer side of the rotating shaft and fixed thereto. The gear is meshed with the rack.

[0008] The brake assembly includes a flyweight, a brake pad and a rotating hub. The rotating hub is annular. The rotating shaft is arranged at the center of the rotating hub. The flyweight is sleeved on the outside of the fixed shaft and is rotatably connected to it. The brake pad is arranged on the outside of one end of the flyweight and cooperates with the rotating hub.

[0009] The fixed shaft includes a first fixed shaft and a second fixed shaft, the flyweight includes a first flyweight and a second flyweight, and the brake pad includes a first brake pad and a second brake pad. The first fixed shaft, the second fixed shaft, the first flyweight and the second flyweight are all arranged on a rotating disk. The first flyweight is sleeved on the outside of the first fixed shaft and is rotatably connected to it. The second flyweight is sleeved on the outside of the second fixed shaft and is rotatably connected to it. The first brake pad is arranged on the outside of one end of the first flyweight, and the first flyweight is matched with the rotating hub. The second brake pad is arranged on the outside of one end of the second flyweight, and the second flyweight is matched with the rotating hub. The first fixed shaft and the second fixed shaft, the first flyweight and the second flyweight, the first brake pad and the second brake pad are respectively symmetrically centered on the rotating disk.

[0010] The control component also includes a reset assembly, which includes an extension plate, a pin and a reset spring. The extension plate is arranged at the other end of the flyweight, and the pin is arranged on the rotating disk and on the side of the flyweight close to the rotating shaft. The extension plate and the pin are connected by a reset spring.

[0011] The pressure sensor includes a sensor housing, an environmental component and a mounting component. The sensor housing is arranged on the top of the fixing frame. The contact in the sensor housing and the touch rod are on the same axis, so that the top of the touch rod is in direct contact with the contact.

[0012] The environmental component includes a heat insulation plate and a buffer plate. The buffer plate is arranged inside the sensor housing, and the heat insulation plate is arranged on the inner side of the buffer plate. The heat insulation plate prevents the working environment of the pressure sensor from being disturbed by the external temperature. The buffer plate reduces the vibration of the pressure sensor when it is subjected to external vibration, thereby avoiding the influence of vibration on the measurement results.

[0013] The mounting assembly includes a Wheatstone bridge and an MCU module, and both the Wheatstone bridge and the MCU module are arranged on the inner side of the buffer plate.

[0014] The interior of the fixing member is hollow, providing installation space for the conducting component and the control component.

[0015] The fixing ring is fixedly connected to the fixing frame, and the connecting rod is fixedly connected to the touching rod.

[0016] The beneficial effects of the utility model are:

[0017] 1. The pressure stabilizing mechanism of the present invention prevents pressure and pressure fluctuations from directly affecting the pressure sensor. At the same time, it is adaptable to different pressure ranges to meet the accuracy requirements of pressure measurement when the pressure stabilizing mechanism is installed in different locations.

[0018] 2. When the contact rod is subjected to a large impact force applied by the outside world, it can be buffered by the buffer component without reducing the conduction of force. When the conduction speed is still too large, the transmission component drives the rotating component to move, thereby driving the brake component to prevent the rotating component from rotating, and can be locked in time. By locking in time, potential failures are avoided and the reliability and stability of the pressure sensor are improved. The realization of this brake function depends on the exquisite coordination between the transmission component, the rotating component and the reset component. Whether in the case of excessive pressure or in the face of various complex operating conditions, it can effectively prevent direct impact on the pressure sensor, ensure that the pressure sensor is always in a safe and stable working environment, and provide reliable protection for the accuracy of pressure measurement. Secondly, when the turbine is running, the pressure pulsation increases, which will affect the accuracy of pressure measurement and cause increased measurement errors. The installed buffer component will reduce excessive pulse pressure to avoid direct impact on the bridge and damage to the bridge in the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure without the pressure sensor;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-section structure;

[0022] Figure 4 is a structural diagram of the transmission component;

[0023] Figure 5 It is a schematic diagram of the structure of the rotating assembly, the brake assembly and the reset assembly;

[0024] Figure 6 It is a structural diagram of the environmental components and installation components of the pressure sensor;

[0025] In the figure: 101-fixing part, 101a-fixing frame, 101b-fixing ring, 101c-circular groove, 102-contact rod, 103-buffer assembly, 103a-U-shaped tube, 103c-touch rod, 201a-connecting rod, 201b-rack, 201c-gear, 201d-rotating shaft, 202a-rotating disk, 202b-fixed shaft, 203a-flyweight, 203b-brake pad, 203c-rotating hub, 204a-return spring, 204b-extension plate, 204c-pin, 400-sensor housing, 401-environmental component, 401a-heat insulation board, 401b-buffer board, 402-mounting assembly, 402a-Wheatstone bridge, 402b-MCU module. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1:

[0029] like Figures 1 to 6As shown, a pressure stabilizing mechanism and a pressure sensor include a pressure stabilizing mechanism and a pressure sensor. The pressure stabilizing mechanism is placed on the pressure measuring tube and the pressure lead pipe at the volute inlet and the tailwater pipe outlet to improve the accuracy of pressure measurement. The pressure stabilizing mechanism includes a conducting component and a control component. The conducting component includes a fixing part 101, a buffer assembly 103 and a contact rod 102. The buffer assembly 103 and the contact rod 102 are partially penetrated into the fixing part 101. The fixing part 101 includes a fixing frame 101a. The top of the fixing frame 101a is provided with a circular groove 101c for facilitating the penetration of the buffer assembly 103 and the contact rod 102, and the contact rod 102 can slide up and down along the circular groove 101c. The pressure sensor is placed on the touch rod 103c of the buffer assembly 103.

[0030] The buffer assembly 103 includes a touch rod 103c and a U-shaped tube 103a arranged inside the fixed frame 101a. The touch rod 103c is slidably connected to one end of the U-shaped tube 103a, and the contact rod 102 is slidably connected to the other end of the U-shaped tube 103a. The U-shaped tube 103a is filled with a solution, and the solution is arranged between the contact rod 102 and the touch rod 103c. The selection of the solution depends on its density, viscosity and saturated vapor pressure. These characteristics will affect the conduction and measurement accuracy of pressure. A fixing ring 101b is provided inside the fixed frame 101a for fixing the buffer assembly 103 and the U-shaped tube 103a.

[0031] The control components include a transmission assembly, a rotating assembly and a brake assembly. The transmission assembly, the rotating assembly and the brake assembly are all arranged inside the fixed frame 101a. The transmission assembly includes a connecting rod 201a, a rack 201b, a gear 201c and a rotating shaft 201d. The connecting rod 201a is arranged on the side of the touch rod 103c and fixed thereto. The rack 201b is arranged on the connecting rod 201a, and the rack 201b is fixedly connected to the connecting rod 201a.

[0032] The rotating assembly includes a rotating disk 202a and a fixed shaft 202b. The fixed shaft 202b is arranged on the rotating disk 202a. The rotating disk 202a and the gear 201c are sequentially sleeved on the outer side of the rotating shaft 201d and fixed thereto. The gear 201c is engaged with the rack 201b.

[0033] The brake assembly includes a flyweight 203a, a brake pad 203b and a rotating hub 203c. The rotating hub 203c is annular, and the rotating shaft 201d is set at the center of the rotating hub 203c. The flyweight 203a is sleeved on the outside of the fixed shaft 202b and is rotatably connected to it. The brake pad 203b is set on the outside of one end of the flyweight 203a, and the brake pad 203b is matched with the rotating hub 203c. When the contact rod 102 is subjected to a large impact force applied by the outside world, the contact rod 102 is pressed down, and the solution inside the U-shaped tube 103a causes the contact rod 103c to rise. The rise of the contact rod 103c drives the connecting rod 201a to move upward, thereby driving the rack 201b to move upward. Since the rack 201b is engaged with the gear 201c, it drives the gear 201c to rotate clockwise, and the gear 201c rotates with the rotating shaft 201d, and the rotating shaft 201d drives the rotating disk 202a to rotate. When the rotating disk 202a rotates, the fixed shaft 202b on the rotating disk 202a performs uniform circular motion, and the flyweight 203a rotates due to the action of centrifugal force. The inner wall of the hub 203c moves, and the faster the rotating disk 202a rotates, the greater the centrifugal force the flyweight 203a is subjected to, and the closer it is to the inner wall of the rotating hub 203c. When the limit is reached (that is, the top of the touching rod 103c directly touches the contact point of the pressure sensor, achieving the purpose of transmitting the impact force applied to the contact rod 102 by the outside to the pressure sensor), the brake pad 203b on the flyweight 203a will fit with the inner wall of the rotating hub 203c, thereby forming a lock. After the flyweight 203a is locked, the rotating shaft 201d will not continue to rotate, thereby forming a reverse lock, so that the touching rod 103c will not damage the pressure sensor due to excessive rise.

[0034] The buffer assembly 103 can be used for buffering without reducing the force transmission. When the transmission speed is still too high, the rotating assembly is driven to move by the transmission assembly, thereby driving the brake assembly to prevent the rotating assembly from rotating.

[0035] Example 2:

[0036] On the basis of Example 1, this embodiment makes improvements to the control component. The fixed shaft 202b includes a first fixed shaft and a second fixed shaft, the flyweight 203a includes a first flyweight and a second flyweight, and the brake pad 203b includes a first brake pad and a second brake pad. The first fixed shaft, the second fixed shaft, the first flyweight and the second flyweight are all arranged on the rotating disk 202a and fixedly connected to the rotating disk 202a. The first flyweight is sleeved on the outside of the first fixed shaft and is rotatably connected to it. The second flyweight is sleeved on the outside of the second fixed shaft and is rotatably connected to it. The first brake pad is arranged on the outside of one end of the first flyweight, and the first flyweight is matched with the rotating hub 203c. The second brake pad is arranged on the outside of one end of the second flyweight, and the second flyweight is matched with the rotating hub 203c. The first fixed shaft and the second fixed shaft, the first flyweight and the second flyweight, and the first brake pad and the second brake pad are respectively symmetrically centered on the rotating disk 202a.

[0037] The control component also includes a reset assembly, which includes an extension plate 204b, a pin 204c and a reset spring 204a. The extension plate 204b is arranged at the other end of the flyweight 203a, the pin 204c is fixed on the rotating disk 202a, and is arranged on the side of the flyweight 203a close to the rotating shaft 201d. The extension plate 204b and the pin 204c are connected by the reset spring 204a. The extension plate 204b includes a first extension plate and a second extension plate, the pin 204c includes a first pin and a second pin, and the return spring 204a includes a first return spring and a second return spring. The first extension plate is arranged at the other end of the first flyweight, the first pin is fixed to the rotating disk 202a and is arranged on the side of the first flyweight close to the rotating shaft 201d, and the first extension plate and the first pin are connected via the first return spring; the second extension plate is arranged at the other end of the second flyweight, the second pin is fixed to the rotating disk 202a and is arranged on the side of the second flyweight close to the rotating shaft 201d, and the second extension plate and the second pin are connected via the second return spring. When the contact rod 102 is not subjected to pressure and the rotating disk 202a does not rotate, the first return spring and the second return spring will return to normal and pull the first flyweight and the second flyweight to reset, as shown in FIG. Figure 5 shown.

[0038] Example 3:

[0039] Based on Example 1 or 2, this embodiment improves the pressure sensor. The pressure sensor includes a sensor housing 400, an environmental component 401 and an installation component 402. The sensor housing 400 is arranged on the top of the fixed frame 101a, and the contacts in the sensor housing 400 are on the same axis as the touch rod 103c.

[0040] Environmental assembly 401 includes a heat shield 401a and a buffer plate 401b. Buffer plate 401b is located inside sensor housing 400, with heat shield 401a located inside buffer plate 401b. Heat shield 401a protects the pressure sensor's operating environment from external temperature disturbances, while buffer plate 401b reduces vibrations when the pressure sensor is exposed to external forces, preventing them from affecting measurement results.

[0041] Mounting assembly 402 includes a Wheatstone bridge 402a and an MCU module 402b, both of which are located inside buffer plate 401b. Pressure sensors are available in piezoelectric and piezoresistive configurations. Using appropriate instruments, the frequency response values of the pressure sensors, as well as the accuracy of the pressure sensor coding and corresponding frequency response signals, are verified under normal atmospheric pressure and standard temperature conditions. To determine the numbering and specific installation locations of the pressure sensors, consider the various sections of the inflatable net. It is best to install the pressure sensors along the cables, at the cable joints. Each cable should have no fewer than four pressure sensors installed. The distance between two pressure sensors near the telephone exchange should not exceed 200 meters. One pressure sensor should be installed at the beginning and end of each cable. One pressure sensor should be installed at each cable branch point. If adjacent branch points are close together (less than 100 meters), only one pressure sensor may be installed. One pressure sensor should be installed at any point where the cable routing method (overhead or underground) changes. The Wheatstone bridge 402a in the pressure sensor converts resistance into voltage output. The signal is amplified and then sent to the MCU module 402b for processing. After calibration at a certain ratio, the pressure value is obtained. Finally, the pressure sensor is embedded in the PCB and packaged.

[0042] The interior of the fixing member 101 is hollow, providing installation space for the conducting components and the control components.

[0043] The fixing ring 101b is fixedly connected to the fixing frame 101a, and the connecting rod 201a is fixedly connected to the touching rod 103c.

[0044] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A pressure stabilizing mechanism and a pressure sensor, characterized in that: The invention comprises a pressure stabilizing mechanism and a pressure sensor, wherein the pressure stabilizing mechanism comprises a conducting component and a control component, wherein the conducting component comprises a fixing member (101), a buffering assembly (103) and a contact rod (102), wherein the buffering assembly (103) and the contact rod (102) are partially penetrated into the fixing member (101), and the fixing member (101) comprises a fixing frame (101a), wherein a circular groove (101c) is provided on the top of the fixing frame (101a) for facilitating the penetration of the buffering assembly (103) and the contact rod (102), and the contact rod (102) can slide up and down along the circular groove (101c), and the pressure sensor is placed on the buffering assembly (103); The buffer assembly (103) comprises a contact rod (103c) and a U-shaped tube (103a) arranged inside a fixing frame (101a); the contact rod (103c) is slidably connected to one end of the U-shaped tube (103a); the contact rod (102) is slidably connected to the other end of the U-shaped tube (103a); the interior of the U-shaped tube (103a) is filled with a solution; and a fixing ring (101b) for fixing the buffer assembly (103) and the U-shaped tube (103a) is arranged inside the fixing frame (101a); The control component includes a transmission assembly, a rotation assembly, and a brake assembly. The transmission assembly includes a connecting rod (201a), a rack (201b), a gear (201c), and a rotating shaft (201d). The connecting rod (201a) is arranged on the side of the contact rod (103c) and fixed thereto, and the rack (201b) is arranged on the connecting rod (201a). The rotating assembly comprises a rotating disk (202a) and a fixed shaft (202b), wherein the fixed shaft (202b) is arranged on the rotating disk (202a), the rotating disk (202a) and the gear (201c) are sequentially sleeved on the outside of the rotating shaft (201d) and fixed thereto, and the gear (201c) is meshed with the rack (201b); The brake assembly includes a flyweight (203a), a brake pad (203b) and a rotating hub (203c). The rotating hub (203c) is annular. The rotating shaft (201d) is arranged at the center of the rotating hub (203c). The flyweight (203a) is sleeved on the outside of the fixed shaft (202b) and is rotatably connected thereto. The brake pad (203b) is arranged on the outside of one end of the flyweight (203a), and the brake pad (203b) is matched with the rotating hub (203c).

2. A pressure stabilizing mechanism and a pressure sensor according to claim 1, characterized in that: The fixed shaft (202b) includes a first fixed shaft and a second fixed shaft, the flyweight (203a) includes a first flyweight and a second flyweight, and the brake pad (203b) includes a first brake pad and a second brake pad. The first fixed shaft, the second fixed shaft, the first flyweight and the second flyweight are all arranged on the rotating disk (202a). The first flyweight is sleeved on the outside of the first fixed shaft and is rotatably connected to it. The second flyweight is sleeved on the outside of the second fixed shaft and is rotatably connected to it. The first brake pad is arranged on the outside of one end of the first flyweight, and the first flyweight is matched with the rotating hub (203c). The second brake pad is arranged on the outside of one end of the second flyweight, and the second flyweight is matched with the rotating hub (203c). The first fixed shaft and the second fixed shaft, the first flyweight and the second flyweight, and the first brake pad and the second brake pad are respectively symmetrically centered on the rotating disk (202a).

3. The pressure stabilizing mechanism and pressure sensor according to claim 1, characterized in that: The control component also includes a reset assembly, which includes an extension plate (204b), a pin (204c) and a reset spring (204a). The extension plate (204b) is arranged at the other end of the flyweight (203a), the pin (204c) is arranged on the rotating disk (202a) and is arranged on the side of the flyweight (203a) close to the rotating shaft (201d), and the extension plate (204b) and the pin (204c) are connected through the reset spring (204a).

4. The pressure stabilizing mechanism and pressure sensor according to claim 1, characterized in that: The pressure sensor comprises a sensor housing (400), an environmental component (401) and a mounting component (402); the sensor housing (400) is arranged on the top of a fixed frame (101a); and the contact point in the sensor housing (400) and the touch rod (103c) are on the same axis.

5. The pressure stabilizing mechanism and pressure sensor according to claim 4, characterized in that: The environmental component (401) comprises a heat insulating plate (401a) and a buffer plate (401b), wherein the buffer plate (401b) is arranged inside the sensor housing (400), and the heat insulating plate (401a) is arranged on the inner side of the buffer plate (401b).

6. The pressure stabilizing mechanism and pressure sensor according to claim 5, characterized in that: The mounting assembly (402) includes a Wheatstone bridge (402a) and an MCU module (402b), and the Wheatstone bridge (402a) and the MCU module (402b) are both arranged on the inner side of the buffer plate (401b).

7. The pressure stabilizing mechanism and pressure sensor according to claim 1, characterized in that: The interior of the fixing member (101) is hollow.

8. The pressure stabilizing mechanism and pressure sensor according to claim 1, characterized in that: The fixing ring (101b) is fixedly connected to the fixing frame (101a), and the connecting rod (201a) is fixedly connected to the touching rod (103c).

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