A liquid level pressure monitor

Abstract

The present invention relates to the technical field of pressure monitors, and in particular to a liquid level pressure monitor, comprising a fixing plate, wherein the fixing plate is connected to the inner wall of a manhole cover, a connecting frame is fixedly connected to the bottom of the fixing plate, a mounting assembly is fixedly connected to the middle of the connecting frame, a connecting line is arranged at the bottom of the mounting assembly, a pressure probe is fixedly connected to the bottom of the connecting line, an air guide tube is arranged at the top of the connecting line, a signal of slight deformation of a first elastic film can be amplified according to a preset ratio through a signal amplifying tube, a scale is arranged on the outside of the signal amplifying tube, and testing of the pressure probe is convenient before use, and the pressure inside the mounting shell can be timely adjusted through the arrangement of the first elastic film and the second elastic film, so that the pressure inside the mounting shell can be adjusted, so that the internal components can work in a relatively stable environment.

Description

Technical Field

[0001] The invention relates to the technical field of pressure monitors, in particular to a liquid level pressure monitor. Background Art

[0002] The liquid level sensor is a pressure sensor that measures the liquid level. The static pressure immersion liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. It uses an isolated diffused silicon sensitive element or a ceramic capacitor pressure sensitive sensor to convert the static pressure into an electrical signal. It is suitable for the liquid level measurement of various media in systems and industries such as petrochemicals, metallurgy, electricity, pharmaceuticals, water supply and drainage, and environmental protection.

[0003] Pressure monitors are also placed in the city's sewers to detect the depth of water in the sewers. Some electronic components of the pressure monitors are mostly fixed on the sewer manhole covers through mounting shells. In order to prevent water from entering the electronic components, the mounting shells used to install the electronic components are often provided with breathing plugs at the bottom to adjust the internal pressure of the mounting shells. In order to avoid the entry of water, circuit boards are often directly sealed with glue.

[0004] Since most manhole covers are cast in concrete, the temperature difference between day and night is large in summer, which causes changes in the internal pressure of the installation shell fixed inside the manhole cover. It is usually adjusted through a breathing plug, but the breathing plug may be corroded and its sealing performance will be reduced if it is in the sewer for a long time. The sewer is always in a humid state, and water mist may enter the installation shell through the breathing plug. The internal components may be damaged if they are in a humid environment for a long time, and their service life may be affected.

[0005] In order to prevent water from entering the installation housing, the electronic components are often directly cast and sealed in waterproof glue. However, when the liquid level pressure monitor is damaged, it is difficult to recover the internal electronic components, and the external glue needs to be removed. The electronic components are easily damaged during the removal process, which is not conducive to the reuse of the electronic components. Summary of the invention

[0006] In view of the problems in the prior art, the present invention provides a liquid level pressure monitor.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a liquid level pressure monitor, comprising a fixing plate, the fixing plate is connected to the inner wall of the manhole cover, the bottom of the fixing plate is fixedly connected to a connecting frame, the middle of the connecting frame is fixedly connected to a mounting assembly, the bottom of the mounting assembly is provided with a connecting line, the bottom of the connecting line is fixedly connected to a pressure probe, and the top of the connecting line is provided with an air guide tube;

[0008] The installed component includes a mounting shell, a mounting seat is arranged at the bottom of the inner wall of the mounting shell, a breathing plug is arranged through the bottom of the mounting shell, the upper end of the breathing plug is placed on the upper surface of the mounting seat, the two breathing plugs are symmetrically arranged, one end of the breathing plug placed inside the mounting shell is covered with a breathing cover on the outside, the breathing cover is fixedly connected to the mounting seat, and a first elastic film is arranged on one side of the breathing cover.

[0009] Specifically, a signal amplifying tube is provided through the outer wall of the breathing mask. The signal amplifying tube is made of transparent glass. Scale lines are provided on the outer wall of the signal amplifying tube. The signal amplifying tube is placed on a side of the breathing mask close to the first elastic film.

[0010] Specifically, a moving ball is slidably connected in the signal amplifying tube, and a second elastic film is provided at one end of the signal amplifying tube away from the breathing mask.

[0011] Specifically, the first elastic film and the second elastic film are made of the same elastic material, and the space between the first elastic film and the second elastic film is sealed.

[0012] Specifically, a connecting cavity is provided in the middle of the mounting seat, the bottom of the signal receiver penetrates into the connecting cavity, and a sealing ring is sleeved on the outside of the signal receiver.

[0013] Specifically, a circuit board shell is fixedly provided on the upper surface of the mounting seat, a circuit board is fixedly connected inside the circuit board shell, the lower end of the circuit board is placed in the connecting cavity, and the circuit board is connected to the lower end of the signal receiver through a wiring harness.

[0014] Specifically, a protruding plate is fixedly connected to the upper surface of the mounting seat, the circuit board shell is inserted into the protruding plate, a glue pouring groove is formed between the protruding plate and the circuit board shell, and sealant is poured in the glue pouring groove.

[0015] Specifically, a sealing groove is provided on the top of the installation shell, and a sealing groove is filled with sealing glue. A sealing cover plate is fixedly connected to the top of the installation shell by bolts and is sealed by the sealing glue.

[0016] Specifically, the mounting base is made of waterproof material.

[0017] Beneficial effects of the present invention:

[0018] (1) The liquid level pressure monitor described in the present invention can amplify the signal of slight deformation of the first elastic film according to a preset ratio through a signal amplifier tube. The outside of the signal amplifier tube is provided with a scale to facilitate testing of the pressure probe before use. The first elastic film and the second elastic film can be set to timely adjust the pressure inside the installation shell, thereby adjusting the pressure inside the installation shell, so that the internal components can work in a relatively stable environment.

[0019] (2) The liquid level pressure monitor described in the present invention can detect and determine whether the breathing plug is damaged in time when a large amount of water enters one of the breathing hoods when the breathing plug is used for a long time. This may cause a large pressure difference between the two breathing hoods.

[0020] (3) In the liquid level pressure monitor described in the present invention, if the breathing plug is damaged, the positions of the moving balls placed in the two signal amplifying tubes will be different. Under normal air pressure, the moving balls will be placed in the middle of the signal amplifying tubes. The position of the moving balls can be used to determine which breathing plug is damaged, thereby facilitating the subsequent repair and replacement of the breathing plug.

[0021] (4) In the liquid level pressure monitor described in the present invention, the protruding plate arranged on the outside of the circuit board housing can play a role of limiting, and the glue cast through the glue pouring groove can prevent water from entering the circuit board housing. At the same time, when recycling, it is only necessary to disassemble the circuit board housing and the mounting base, and pull the circuit board out of the circuit board housing for recycling, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 A schematic diagram of the overall structure of a liquid level pressure monitor provided by the present invention;

[0024] Figure 2 A schematic diagram of the fixing plate structure provided by the present invention;

[0025] Figure 3 A schematic diagram of the structure of the installation assembly provided by the present invention;

[0026] Figure 4 The present invention provides Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 A cross-sectional view of a breathing mask provided by the present invention;

[0028] Figure 6 The present invention provides Figure 5 Enlarged view of point B in the middle;

[0029] Figure 7 A circuit board housing and a circuit board position diagram provided by the present invention;

[0030] Figure 8 The present invention provides Figure 7 Enlarged view of center C.

[0031] In the figure: 1. pressure probe; 11. connecting wire; 13. air duct; 2. mounting assembly; 21. sealing groove; 211. sealing cover plate; 23. mounting seat; 231. sealing ring; 232. connecting cavity; 233. protruding plate; 234. glue pouring groove; 24. signal receiver; 25. breathing mask; 251. first elastic film; 26. signal amplifier tube; 261. second elastic film; 262. moving ball; 27. circuit board housing; 271. circuit board; 262. moving ball; 28. breathing plug; 29. ​​mounting housing; 20. wiring harness; 3. fixing plate; 31. connecting frame; 6. manhole cover. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] like Figure 1-Figure 8 As shown, a liquid level pressure monitor according to the present invention comprises a fixing plate 3, the fixing plate 3 is connected to the inner wall of the manhole cover 6, a connecting frame 31 is fixedly connected to the bottom of the fixing plate 3, a mounting assembly 2 is fixedly connected to the middle of the connecting frame 31, a connecting line 11 is arranged at the bottom of the mounting assembly 2, a pressure probe 1 is fixedly connected to the bottom of the connecting line 11, and an air guide tube 13 is arranged at the top of the connecting line 11;

[0034] The installed component 2 includes a mounting shell 29, and a mounting seat 23 is arranged at the bottom of the inner wall of the mounting shell 29. A breathing plug 28 is arranged through the bottom of the mounting shell 29, and the upper end of the breathing plug 28 is placed on the upper surface of the mounting seat 23. The two breathing plugs 28 are symmetrically arranged, and one end of the breathing plug 28 placed inside the mounting shell 29 is covered with a breathing cover 25 on the outside, and the breathing cover 25 is fixedly connected to the mounting seat 23, and a first elastic film 251 is arranged on one side of the breathing cover 25.

[0035] The mounting assembly 2 is connected to the bottom of the manhole cover 6 through the fixing plate 3 and the connecting frame 31, and the pressure probe 1 is placed at the bottom of the sewer. The upper end of the air duct 13 is connected to the external atmosphere. The water depth in the sewer is detected by the pressure exerted on the pressure probe 1, and the signal is received by the signal receiver 24. The signal is then received by the components on the circuit board 271 and sent to an external receiving device, thereby realizing real-time monitoring of the water depth in the sewer.

[0036] When gas enters or is discharged through the breathing plug 28, the first elastic film 251 will be deformed. When the breathing plug 28 is damaged, more water enters one of the breathing masks 25. The breathing mask 25 and the first elastic film 251 play a sealing role, which plays a temporary sealing role, further preventing water in the sewer from entering the installation shell 29, causing corrosion and damage to the electronic components inside the installation shell 29.

[0037] Specifically, a signal amplifying tube 26 is provided through the outer wall of the breathing mask 25 . The signal amplifying tube 26 is made of transparent glass. Scale lines are provided on the outer wall of the signal amplifying tube 26 . The signal amplifying tube 26 is placed on one side of the breathing mask 25 close to the first elastic film 251 .

[0038] When the weather is hot, the temperature of the manhole cover 6 rises, causing the temperature inside the installation shell 29 to rise accordingly. The internal gas expands, causing the internal air pressure to increase. During this process, the second elastic film 261 will be deformed under the action of pressure, and the air pressure on one side of the moving ball 262 in the signal amplifier tube 26 increases, and the moving ball 262 moves to the side with lower air pressure, thereby deforming the first elastic film 251. The gas placed in the breathing mask 25 is discharged to the outside of the installation shell 29 through the breathing plug 28, thereby adjusting the internal pressure of the installation shell 29 and allowing the internal components to work in a relatively stable environment.

[0039] When summer night comes, due to the higher temperature between day and night, the temperature inside the installation shell 29 drops, causing the gas pressure inside the installation shell 29 to decrease. During this process, the second elastic film 261 will deform in the opposite direction. During this process, the moving ball 262 will deform in the direction away from the first elastic film 251, and the gas enters the breathing mask 25 through the breathing plug 28, so that the internal pressure can still be in a stable state when the temperature inside the installation shell 29 drops, which is beneficial to the normal operation of the internal components of the installation shell 29.

[0040] Specifically, a moving ball 262 is slidably connected in the signal amplifying tube 26 , and a second elastic film 261 is provided at one end of the signal amplifying tube 26 away from the breathing mask 25 .

[0041] The deformation of the second elastic film 261 is greater than that of the first elastic film 251. When a slight deformation occurs in the first elastic film 251, it can be observed through the deformation of the second elastic film 261. The signal of the slight deformation in the first elastic film 251 can be amplified according to a preset ratio through the signal amplifier tube 26. A scale is provided on the outside of the signal amplifier tube 26 to facilitate testing before the pressure probe 1 is used.

[0042] Specifically, the first elastic film 251 and the second elastic film 261 are made of the same elastic material, and the space between the first elastic film 251 and the second elastic film 261 is sealed.

[0043] The deformation of the second elastic film 261 is greater than that of the first elastic film 251. The space between the first elastic film 251 and the second elastic film 261 is sealed. When the first elastic film 251 is deformed, the pressure on one side of the moving ball 262 will increase due to the constant internal space, and the pressure inside the signal amplifier tube 26 will be balanced through the movement of the small ball.

[0044] Specifically, a connecting cavity 232 is provided in the middle of the mounting seat 23 , the bottom of the signal receiver 24 penetrates into the connecting cavity 232 , and a sealing ring 231 is sleeved on the outside of the signal receiver 24 .

[0045] The sealing ring 231 plays a sealing role. The signal receiver 24 can receive the data detected by the pressure probe 1, and then receive and send it to the external receiving device through the components on the circuit board 271, so as to realize the real-time monitoring of the water depth in the sewer. The setting of the sealing ring 231 prevents water from entering the connecting cavity 232, thus ensuring the normal operation of the circuit board 271 and various electronic components.

[0046] Specifically, a circuit board housing 27 is fixedly provided on the upper surface of the mounting base 23 , a circuit board 271 is fixedly connected inside the circuit board housing 27 , the lower end of the circuit board 271 is placed in the connecting cavity 232 , and the circuit board 271 is connected to the lower end of the signal receiver 24 through a wiring harness 20 .

[0047] The circuit board 271 is connected to the signal receiver 24 through the wiring harness 20, and the connecting cavity 232 is in a sealed state, which is beneficial to protect various components from corrosion.

[0048] Specifically, a protruding plate 233 is fixedly connected to the upper surface of the mounting seat 23 , the circuit board housing 27 is inserted into the protruding plate 233 , a glue pouring groove 234 is formed between the protruding plate 233 and the circuit board housing 27 , and a sealant is poured into the glue pouring groove 234 .

[0049] The protruding plate 233 arranged on the outside of the circuit board housing 27 can play a limiting role to ensure the stability of the circuit board housing 27. At the same time, the glue cast through the glue pouring groove 234 can prevent water from entering the circuit board housing 27, so that the connection between the circuit board housing 27 and the mounting seat 23 is better sealed. At the same time, when recycling, you only need to disassemble the circuit board housing 27 and the mounting seat 23, and pull the circuit board 271 out of the circuit board housing 27 for recycling, which is convenient and quick.

[0050] Specifically, a sealing groove 21 is provided on the top of the installation shell 29, and a sealing adhesive is filled in the sealing groove 21. A sealing cover plate 211 is fixedly connected to the top of the installation shell 29 by bolts and is sealed by the sealing adhesive.

[0051] By casting the sealant, the connection between the mounting shell 29 and the mounting seat 23 is more sealed to prevent water from entering the mounting shell 29 from inside the mounting shell 29 , and the sealing cover plate 211 plays a sealing role.

[0052] Specifically, the mounting seat 23 is made of waterproof material.

[0053] The mounting seat 23 is made of waterproof material to reduce the amount of water that enters the mounting shell 29 . It can also ensure that no water enters the connecting cavity 232 in the middle of the mounting seat 23 , which is beneficial to ensuring the normal operation and service life of the electronic components inside the internal connecting cavity 232 .

[0054] Working principle: The mounting assembly 2 is connected to the bottom of the manhole cover 6 through the fixing plate 3 and the connecting frame 31, and the pressure probe 1 is placed at the bottom of the sewer. The upper end of the air duct 13 is connected to the external atmosphere. The water depth in the sewer is detected by the pressure exerted on the pressure probe 1, and received by the signal receiver 24. Then, it is received by the components on the circuit board 271 and sent to the external receiving device, thereby realizing real-time monitoring of the water depth in the sewer.

[0055] When the weather is hot, the temperature of the manhole cover 6 rises, causing the temperature inside the installation shell 29 to rise accordingly. The internal gas expands, causing the internal air pressure to increase. During this process, the second elastic film 261 will be deformed under the action of pressure, and the air pressure on one side of the moving ball 262 in the signal amplifier tube 26 increases, and the moving ball 262 moves to the side with lower air pressure, thereby deforming the first elastic film 251. The gas placed in the breathing mask 25 is discharged to the outside of the installation shell 29 through the breathing plug 28, thereby adjusting the internal pressure of the installation shell 29 and allowing the internal components to work in a relatively stable environment.

[0056] When the breathing plug 28 is used for a long time, more water enters one of the breathing masks 25, which may cause a large pressure difference between the two breathing masks 25. It can be discovered in time whether the breathing plug 28 is damaged, which is convenient for subsequent maintenance and replacement.

[0057] When the breathing plug 28 is damaged, more water enters one of the breathing masks 25, and the breathing mask 25 and the first elastic film 251 play a sealing role, which plays a temporary sealing role, further preventing the water in the sewer from entering the installation shell 29 and causing damage to the electronic components inside the installation shell 29.

[0058] If the breathing plug 28 is damaged, the positions of the moving balls 262 placed in the two signal amplifier tubes 26 will be different. Under normal air pressure, the moving ball 262 will be placed in the middle of the signal amplifier tube 26. The position of the moving ball 262 can be used to determine which breathing plug 28 is damaged, which is convenient for subsequent repair and replacement of the breathing plug 28. The signal amplifier tube 26 can amplify the signal of slight deformation of the first elastic film 251 according to a preset ratio. A scale is provided on the outside of the signal amplifier tube 26 to facilitate testing before the pressure probe 1 is used.

[0059] The protruding plate 233 arranged on the outside of the circuit board housing 27 can play a limiting role. At the same time, the glue cast through the glue pouring groove 234 can prevent water from entering the circuit board housing 27. At the same time, when recycling, it is only necessary to disassemble the circuit board housing 27 and the mounting base 23, and pull the circuit board 271 out of the circuit board housing 27 for recycling, which is convenient and quick.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A liquid level pressure monitor, comprising a fixing plate (3), characterized in that: The fixing plate (3) is connected to the inner wall of the manhole cover (6); a connecting frame (31) is fixedly connected to the bottom of the fixing plate (3); a mounting assembly (2) is fixedly connected to the middle of the connecting frame (31); a connecting line (11) is provided at the bottom of the mounting assembly (2); a pressure probe (1) is fixedly connected to the bottom of the connecting line (11); and an air guide tube (13) is provided at the top of the connecting line (11); The installed component (2) comprises an installation shell (29), the bottom of the inner wall of the installation shell (29) is provided with a mounting seat (23), the bottom of the installation shell (29) is provided with a breathing plug (28), the upper end of the breathing plug (28) is placed on the upper surface of the mounting seat (23), the two breathing plugs (28) are symmetrically arranged, one end of the breathing plug (28) placed inside the installation shell (29) is covered with a breathing cover (25), the breathing cover (25) is fixedly connected to the mounting seat (23), and one side of the breathing cover (25) is provided with a first elastic film (251); A signal amplifying tube (26) is provided through the outer wall of the breathing mask (25); the signal amplifying tube (26) is made of transparent glass, and scale lines are provided on the outer wall of the signal amplifying tube (26); the signal amplifying tube (26) is placed on a side of the breathing mask (25) close to the first elastic film (251); A moving ball (262) is slidably connected inside the signal amplifying tube (26), and a second elastic film (261) is provided at one end of the signal amplifying tube (26) away from the breathing mask (25).

2. A liquid level pressure monitor according to claim 1, characterized in that: The first elastic film (251) and the second elastic film (261) are made of the same elastic material, and the space between the first elastic film (251) and the second elastic film (261) is sealed.

3. A liquid level pressure monitor according to claim 2, characterized in that: A connecting cavity (232) is provided in the middle of the mounting seat (23), a signal receiver (24) is connected through the connecting cavity (232), and a sealing ring (231) is sleeved on the outside of the signal receiver (24).

4. A liquid level pressure monitor according to claim 3, characterized in that: A circuit board housing (27) is fixedly provided on the upper surface of the mounting seat (23), a circuit board (271) is fixedly connected inside the circuit board housing (27), the lower end of the circuit board (271) is placed in the connecting cavity (232), and the circuit board (271) is connected to the lower end of the signal receiver (24) via a wiring harness (20).

5. A liquid level pressure monitor according to claim 4, characterized in that: A protruding plate (233) is fixedly connected to the upper surface of the mounting seat (23), the circuit board housing (27) is inserted into the protruding plate (233), a glue pouring groove (234) is formed between the protruding plate (233) and the circuit board housing (27), and a sealing glue is poured into the glue pouring groove (234).

6. A liquid level pressure monitor according to claim 5, characterized in that: A sealing groove (21) is provided at the top of the installation shell (29), and a sealing adhesive is filled in the sealing groove (21). A sealing cover plate (211) is fixedly connected to the top of the installation shell (29) by means of bolts, and is sealed by means of the sealing adhesive.

7. The liquid level pressure monitor according to claim 1, characterized in that: The mounting seat (23) is made of waterproof material.

Images