U-shaped differential pressure gauge unloading device for detecting flow nozzle of compressor
By introducing a large U-shaped water storage pipe and a gas-liquid separator unloading device into the U-shaped differential pressure gauge, the problem of water spraying from the differential pressure gauge was solved, realizing automatic unloading and media recovery of the differential pressure gauge, and improving the continuity and efficiency of detection.
Patent Information
- Application Number
- CN202620033486.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-13
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2036-01-13
AI Technical Summary
Existing U-type differential pressure gauges spray water during the detection process due to excessive pressure pulses, causing detection interruption, environmental pollution, and affecting measurement accuracy and continuity.
Design a U-shaped differential pressure gauge unloading device, which includes a large U-shaped water storage pipe, a gas-liquid separator and a return water pipe, forming an automatic unloading and recovery system. The gas-liquid separator relieves pressure to prevent water spraying, and the water medium is recycled back after the pressure is restored.
It prevents water spraying from the U-shaped differential pressure gauge under high pressure, maintains measurement accuracy and continuity, avoids detection interruption and manual intervention, and improves detection efficiency and accuracy.
Smart Images
Figure CN223925901U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nozzle detection technology, specifically a U-shaped differential pressure gauge unloading device for compressor flow nozzle detection. Background Technology
[0002] The flow nozzle of a compressor is a key device for measuring the compressor's discharge capacity. According to international standards such as ASME, a U-tube manifold is typically used to measure the pressure difference across the flow nozzle, thereby calculating the accurate flow rate. A conventional U-tube manifold is filled with water as its working medium, and its measurement range is directly determined by the height of the U-tube.
[0003] In actual testing, especially during sudden changes in operating conditions or system debugging, the pressure system under test may generate pressure pulses or overpressures far exceeding the normal measurement range. When this pressure exceeds the upper limit of the U-tube manometer's range (e.g., ±9.8 kPa, corresponding to approximately 1000 mm of water column), the water column in the U-tube will be rapidly ejected from the nozzle under the impact of high-pressure gas. This phenomenon leads to a series of problems: Firstly, after the water column ejects, the U-tube manometer cannot continue to work, and testing must be paused, water medium must be added back into the tube, and gas in the pipeline must be purged. This process is cumbersome and time-consuming, seriously affecting the continuity and efficiency of the testing work. Secondly, the ejected water will contaminate the workbench and equipment, potentially causing electrical safety hazards. At the same time, repeated water addition and venting operations introduce human error, affecting the accuracy and repeatability of the measurement data. Utility Model Content
[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides a U-shaped differential pressure gauge unloading device for compressor flow nozzle detection. By connecting a large U-shaped water storage pipe, a gas-liquid separator, and a return water pipe, an automatic unloading and recovery system is formed. When overpressure occurs, water is introduced into the separator to relieve pressure and prevent the U-shaped differential pressure gauge from spraying water. After pressure stabilization, the water is returned and circulated. The structure is simple and the cost is low. While ensuring measurement accuracy and standardization, it effectively avoids interruptions and manual intervention, significantly improving detection efficiency and continuity.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a U-shaped differential pressure gauge unloading device for compressor flow nozzle detection, comprising a gas storage tank, a main connecting pipe, a straight pipe, a U-shaped differential pressure gauge, a large U-shaped water storage pipe, and a gas-liquid separator. The gas storage tank has a regulating valve assembly at its outlet end, which is connected to one end of the straight pipe via the main connecting pipe. The other end of the straight pipe has an mounting head for installing the nozzle. A support frame is mounted on the gas storage tank, and the straight pipe is mounted on the support frame. A fixing frame is mounted on the gas storage tank and the support frame. The U-shaped differential pressure gauge is mounted on the fixing frame. A test interface is provided on the straight pipe, and the test interface is connected to one end of the U-shaped differential pressure gauge. A first connecting pipe is provided between the two. One end of the large U-shaped water storage pipe is provided with a T-joint. The straight pipe is provided with an unloading interface, and a second connecting pipe is provided between the unloading interface and the T-joint. The interface of the T-joint is provided with a water inlet, and the water inlet is provided with a valve. The other end of the large U-shaped water storage pipe is provided with an elbow, and the elbow is connected to the inlet end of the gas-liquid separator through a third connecting pipe. The gas-liquid separator is provided with an exhaust port at the top and a drain port at the bottom. The drain port is connected to the body of the large U-shaped water storage pipe through a return water pipe, and a valve is provided on the return water pipe. The maximum pressure bearing height of the large U-shaped water storage pipe is equal to half of the maximum measuring pressure height of the U-shaped differential pressure gauge.
[0006] Preferably, the large U-shaped water storage pipe is made of 304 stainless steel and is equipped with a level mirror at the scale.
[0007] Preferably, the bottom of the large U-shaped water storage pipe is provided with a fixing seat for fixing it to the platform or the ground.
[0008] Preferably, the bottom of the gas storage tank is provided with wheels.
[0009] This utility model provides a U-shaped differential pressure gauge unloading device for compressor flow nozzle detection, which has the following beneficial effects:
[0010] This invention establishes a highly efficient automatic unloading and media recovery system by adding a gas-liquid separator and a return water pipe connected to a large U-shaped water storage pipe. When the pressure exceeds the limit, the water flow is automatically guided into the gas-liquid separator to relieve pressure, fundamentally preventing water spraying from the U-shaped differential pressure gauge. After the pressure recovers, the water medium can flow back, achieving recycling. This device has a simple structure and low cost. Without affecting the measurement accuracy and standardization of the original system, it significantly avoids test interruptions and manual intervention, greatly improving detection efficiency and continuity. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the overall design of this utility model.
[0012] In the diagram: 1. Gas tank; 2. Wheels; 3. Regulating valve assembly; 4. Main connecting pipe; 5. Straight pipe; 6. Mounting head; 7. Support frame; 8. Test interface; 9. First connecting pipe; 10. U-shaped differential pressure gauge; 11. Unloading interface; 12. Second connecting pipe; 13. T-joint; 14. Large U-shaped water storage pipe; 15. Fixing base; 16. Elbow; 17. Gas-liquid separator; 18. Exhaust port; 19. Return water pipe; 20. Water inlet; 21. Fixing frame; 22. Drain port; 23. Third connecting pipe. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] like Figure 1 As shown, a U-shaped differential pressure gauge unloading device for compressor flow nozzle detection includes a gas storage tank 1, a main connecting pipe 4, a straight pipe 5, a U-shaped differential pressure gauge 10, a large U-shaped water storage pipe 14, and a gas-liquid separator 17. The gas storage tank 1 has a regulating valve assembly 3 at its outlet end, which is connected to one end of the straight pipe 5 via the main connecting pipe 4. The other end of the straight pipe 5 has an mounting head 6 for installing a nozzle. A support frame 7 is mounted on the gas storage tank 1, and the straight pipe 5 is mounted on the support frame 7. A fixing frame 21 is mounted on the gas storage tank 1 and the support frame 7. The U-shaped differential pressure gauge 10 is mounted on the fixing frame 21. A test interface 8 is provided on the straight pipe 5, and a first connecting pipe 9 is provided between the test interface 8 and one end of the U-shaped differential pressure gauge 10. A tee connector 13 is provided at one end of the large U-shaped water storage pipe 14. An unloading interface 11 is provided on the straight pipe 5, and the unloading interface 11 is connected to the tee connector 17. A second connecting pipe 12 is provided between the three-way connectors 13. A water inlet 20 is provided on the interface of the three-way connector 13, and a valve is provided on the water inlet 20. An elbow 16 is provided at the other end of the large U-shaped water storage pipe 14. The elbow 16 is connected to the inlet end of the gas-liquid separator 17 through a third connecting pipe 23. An exhaust port 18 is provided at the top of the gas-liquid separator 17 and a drain port 22 is provided at the bottom. The drain port 22 is connected to the pipe body of the large U-shaped water storage pipe 14 through a return water pipe 19, and a valve is provided on the return water pipe 19. The maximum pressure bearing height of the large U-shaped water storage pipe 14 is equal to half of the maximum measuring pressure height of the U-shaped differential pressure gauge 10. The large U-shaped water storage pipe 14 is made of 304 stainless steel and a liquid level mirror is provided at the scale. A fixing seat 15 is provided at the bottom of the large U-shaped water storage pipe 14 for fixing to the platform or the ground. The bottom of the gas storage tank 1 is provided with a traveling wheel 2.
[0015] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows:
[0016] According to the instruction manual Figure 1 As can be seen, in this utility model, the gas storage tank 1, the straight pipe 5, and the U-shaped differential pressure gauge 10 are connected. The U-shaped differential pressure gauge 10 is filled with water, and the liquid level is at the "0" mark. Before use, first fix the large U-shaped water storage pipe 14 on the platform or ground to ensure its stability. Then, connect the unloading interface 11 to the tee connector 13 through the second connecting pipe 12. The other two interfaces of the tee connector 13 are connected to the water inlet 20 and the large U-shaped water storage pipe 14, respectively. A valve must be installed on the water inlet 20, which is closed during use. Next, connect the large U-shaped water storage pipe 14 to the inlet end of the gas-liquid separator 17 through the elbow 16 and the third connecting pipe 23. The drain port 22 of the gas-liquid separator 17 is connected to the large U-shaped water storage pipe 14 through the return water pipe 19, generally connected near the port and sealed. A valve must be installed on the return water pipe 19, which can be an electrically controlled valve, and it is closed during use. Finally, open the valve of the water inlet 20 to replenish water to the large U-shaped water storage pipe 14, ensuring the liquid level is at the "0" mark, and then close the valve of the water inlet 20. In this utility model, the main connecting pipe 4, the first connecting pipe 9, the second connecting pipe 12, the third connecting pipe 23, and the return water pipe 19 can all be made of flexible tubing with a certain pressure resistance.
[0017] After completing the above steps, the nozzle is installed on the mounting head 6, which is existing technology. The regulating valve group 3 of the gas storage tank 1 is opened and adjusted. Due to the small size of the nozzle's air orifice, the air pressure in the straight pipe 5 increases. The air pressure enters one end of the U-shaped differential pressure gauge 10 through the first connecting pipe 9. The pressure causes the liquid level at the connecting end of the U-shaped differential pressure gauge 10 to drop, and the liquid level at the open end to rise. After stabilization, the reading is taken. During this process, the liquid in the large U-shaped water storage pipe 14 is also affected by the air pressure. The liquid level at the tee joint 13 drops, and the liquid level at the elbow 16 rises. If the operating conditions change abruptly or the system is mis-calibrated, and the air pressure exceeds the maximum measuring pressure height of the U-shaped differential pressure gauge 10, since the maximum pressure bearing height of the large U-shaped water storage pipe 14 is equal to half of the maximum measuring pressure height of the U-shaped differential pressure gauge 10, most of the liquid in the large U-shaped water storage pipe 14 enters the gas-liquid separator 17. It's important to explain here that when the gas pushes the liquid to the end of the large U-shaped water storage pipe 14, the gas-liquid mixture becomes quite pronounced. The gas will escape with the liquid to the gas-liquid separator 17, which is when pressure is released. Not all the water will escape unless there is a very large instantaneous airflow. The large U-shaped water storage pipe 14 is connected to the external atmosphere through the exhaust port 18 of the gas-liquid separator 17. The gas pressure is released, and the pressure inside the U-shaped differential pressure gauge 10 will decrease, or even reset. At this point, the gas storage tank 1 is closed again, and the valve on the return water pipe 19 is opened. The liquid in the gas-liquid separator 17 returns to the large U-shaped water storage pipe 14 through the return water pipe 19, ensuring the liquid level is at the "0" mark. If the level is insufficient, water is added through the water inlet 20. The valve assembly 3 is readjusted, and the measurement is performed again. Here, the inner diameter of the large U-shaped water storage pipe 14 is related to the unloading capacity. Normally, the larger the diameter, the greater the unloading capacity, provided it is smaller than the inner diameter of the straight pipe 5. This invention establishes a highly efficient automatic unloading and media recovery system by adding a gas-liquid separator 17 connected to a large U-shaped water storage pipe 14 and a return water pipe 19. When the pressure exceeds the limit, the water flow is automatically guided into the gas-liquid separator 17 to release pressure, fundamentally preventing the U-shaped differential pressure gauge 10 from spraying water. After the pressure recovers, the water medium can flow back, achieving recycling. This device has a simple structure and low cost. Without affecting the measurement accuracy and standardization of the original system, it significantly avoids test interruptions and manual intervention, greatly improving detection efficiency and continuity.
[0018] Possible implementation method: Assuming a U-shaped differential pressure gauge 10 with a maximum scale of 16000 Pa is used, then the maximum pressure of the large U-shaped water storage tube 14 is 8000 Pa. State 1: When the air pressure is 0-8000 Pa, the measurement is normal, the U-shaped differential pressure gauge 10 reads normally, and the water in the large U-shaped water storage tube 14 will not enter the gas-liquid separator 17. Taking an air pressure of 8000 Pa as an example, the scales of both the U-shaped differential pressure gauge 10 and the side with the highest liquid level in the large U-shaped water storage tube 14 are 8000 Pa. State 2: When the air pressure is between 8000Pa and 16000Pa, the measurement is normal, and the U-shaped differential pressure gauge 10 reads normally. Some of the water in the large U-shaped water storage pipe 14 will enter the gas-liquid separator 17. Taking the critical state of 16000Pa as an example, there is no water within the scale range of the large U-shaped water storage pipe 14, only water from the 8000Pa scale to the upper edge. At this time, even without considering the water in the elbow 16 and the third connecting pipe 23, the large U-shaped water storage pipe 14 is still not connected to the exhaust port 18 of the gas-liquid separator 17. The measurement value of the U-shaped differential pressure gauge 10 is accurate and will not spray out. State 3: When the air pressure is greater than 16000Pa, which generally means much greater than 16000Pa, most of the water in the large U-shaped water storage pipe 14 is forced into the gas-liquid separator 17, which connects to the exhaust port 18 and is connected to the atmosphere. The air pressure is released, and the pressure in the U-shaped differential pressure gauge 10 also decreases, so it will not spray out. It should be noted that after completing states two and three, the water in the large U-shaped water storage pipe 14 needs to be reset through the return water pipe 19.
[0019] The large U-shaped water storage pipe 14 is made of 304 stainless steel, which improves the durability of the large U-shaped water storage pipe 14, and a liquid level mirror is set at the scale to facilitate observation of the liquid level.
[0020] The large U-shaped water storage pipe 14 is equipped with a fixing base 15 at its bottom for fixing to the platform or ground, which facilitates the erection of the large U-shaped water storage pipe 14.
[0021] The bottom of the gas storage tank 1 is equipped with wheels 2 for easy transport.
[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A U-shaped differential pressure gauge unloading device for compressor flow nozzle detection, characterized by, The utility model relates to a gas storage tank (1), main connecting pipe (4), straight pipe (5), U type pressure difference meter (10), big U type water storage pipe (14) and gas-liquid separator (17), the gas outlet end of gas storage tank (1) is provided with regulating valve group (3), regulating valve group (3) is connected with the one end of straight pipe (5) through main connecting pipe (4), the other end of straight pipe (5) is provided with the mounting head (6) for installing nozzle, gas storage tank (1) is provided with support frame (7), and straight pipe (5) is arranged on support frame (7), gas storage tank (1) and support frame (7) are provided with fixed frame (21), U type pressure difference meter (10) is arranged on fixed frame (21), and straight pipe (5) is provided with test interface (8) and is provided with first connecting pipe (9) between test interface (8) and one end of U type pressure difference meter (10), one end of big U type water storage pipe (14) is provided with three-way joint (13), unloading interface (11) is arranged on straight pipe (5), and second connecting pipe (12) is arranged between unloading interface (11) and three-way joint (13), the interface of three-way joint (13) is provided with water supplementing mouth (20), water supplementing mouth (20) is provided with valve, the other end of big U type water storage pipe (14) is provided with elbow (16), elbow (16) is connected with the import end of gas-liquid separator (17) through third connecting pipe (23), the top of gas-liquid separator (17) is provided with exhaust port (18) and is provided with liquid outlet (22) in the bottom, the pipe body between liquid outlet (22) and big U type water storage pipe (14) is connected through backwater pipe (19), backwater pipe (19) is provided with valve, the maximum pressure-bearing height of big U type water storage pipe (14) is equal to half of the maximum measurement pressure height of U type pressure difference meter (10).
2. A U-shaped differential pressure unloading device for compressor flow nozzle detection according to claim 1, characterized in that, Big U type water storage pipe (14) adopts 304 stainless steel material, and is provided with liquid level mirror at scale.
3. A U-shaped differential pressure unloading device for compressor flow nozzle detection according to claim 1, characterized in that, The bottom of big U type water storage pipe (14) is provided with fixed seat (15) for fixing with platform or ground.
4. A U-shaped differential pressure unloading device for compressor flow nozzle detection according to claim 1, characterized in that, The bottom of gas storage tank (1) is provided with walking wheel (2).