Check valve with temperature, pressure and flow speed monitoring and flow metering functions

Abstract

The utility model belongs to the technical field of valves and fluid flow parameter monitoring equipment thereof, particularly relates to a check valve with temperature, pressure and flow speed monitoring and flow metering functions, and aims to overcome the defects in the prior art and solve hardware support required in DMA (direct memory access) control management of a pipe network. According to the technical scheme, a pair of transducer fixing columns and a transducer are embedded, fixed and sealed at flow channel openings of flanges at the two ends of the check valve respectively, so that multiple sets of ultrasonic measurement channels with the large range ratio are formed, signal lines enter a second instrument box through the interiors of the flanges, a first line protecting pipe, a fifth hole and a middle hole to be connected with a first integrating circuit PCB, and a second integrating circuit PCB is formed. The valve body cover of the check valve is not only internally provided with the signal line through hole, but also is integrated with the instrument box, so that the check valve with temperature, pressure and flow speed monitoring and flow metering functions is formed, and the check valve is complete in function, simple in structure and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and fluid flow monitoring equipment thereof, and specifically relates to a check valve with temperature, pressure, flow rate monitoring and flow metering functions. Background Art

[0002] Check valves are commonly used devices that prevent fluid backflow during pipeline fluid transportation and are responsible for the safety control of pipeline networks and equipment. They are widely used in the industrial field and municipal and people's livelihood water, heat, and gas transmission and distribution pipelines in large quantities.

[0003] As we enter the era of Internet of Things, big data, artificial intelligence and industrial automation, the construction of smart city systems, especially in the fields of water, heat and gas supply, drainage and sewage treatment that are related to people's livelihood, requires remote data tracking of the pipelines of a huge pipeline network through the Internet and real-time grasp of the values ​​of parameters such as temperature, pressure and flow rate (flow) in the pipelines at each pipeline location, so as to achieve accurate control and adjustment of the pipelines and systems, and play a role in balancing supply and ensuring safe operation of the system.

[0004] In industrial production and control, such as the chemical industry, for the precise control of chemical material transportation systems, safety monitoring of chemical leaks and risk control, the use of check valves with ultrasonic flow detection and metering is also a very necessary system control equipment that meets objective needs.

[0005] Check valves with ultrasonic flow detection and metering are also necessary for monitoring leakage in pipe network supply. For example, in the civil water supply system, from water plants to users, there is currently a large gap between production and sales, with trade settlement accounting for only 60-80% of the water supplied by water plants, which means that 40-20% of the water is missing. The low measurement range ratio and inaccurate accuracy of the flowmeter currently used are only one of the reasons.

[0006] Smart water services are an integral part of smart cities, and DMA is one of the core architectures of smart water services. The concept of DMA (District Metering Area) was first proposed by the British Water Industry Association in 1980. It is now more commonly interpreted as zoning management + leakage detection, and its scope covers water pipes, distribution pipes and cascade pipelines. How to reduce the gap between production and sales of water resources is currently an important issue that water supply units are most concerned about and urgently need to solve.

[0007] Ultrasonic flowmeters and electromagnetic flowmeters are the most commonly used high-precision, wide-range, fully electronic flowmeters in the field of water metering. The working principle of the electromagnetic flowmeter determines that an excitation coil needs to be installed on the outside of the flowmeter tube, so it is not suitable for installation on the check valve. In terms of technological advancement, ultrasonic flow measurement of fluid flow has a smaller starting flow and a wider range ratio than the electromagnetic flowmeter, and more importantly, its flow velocity measurement component is small in size, which is convenient for placement in various narrow application spaces. In this regard, the electromagnetic flowmeter cannot be installed inside the check valve to achieve this. Therefore, installing an ultrasonic flow measurement device with a small size, high flow measurement accuracy and wide range in the check valve is an effective way to solve the flow monitoring and control of the DMA system, as well as to detect leakage and solve the problem of poor water supply and sales.

[0008] At present, on the fluid transportation pipeline, the device that can provide pipeline fluid parameters such as flow rate, pressure or temperature is the flow meter, but the flow meter is usually installed at the end user of the pipeline network. Its function is to trade and settle the user's fluid usage. Therefore, its price is high and the number of distribution is limited. For a large number of transmission and distribution pipelines, especially when the pipeline is laid below the road surface, the control center wants to know the flow rate / flow rate and the changes in the pressure and temperature parameters of the fluid in the pipeline. In this way, it can instantly grasp the circulation status of the pipeline fluid in the pipeline system and the possible leakage of the pipeline fluid and can timely control, manage or maintain it. Check valves are the most used, low-priced and necessary equipment for controlling the flow direction of fluids in the pipeline according to the different calibers and different layers of the pipeline network in the process of pipeline fluid transportation. Therefore, installing a device with temperature, pressure, flow rate monitoring and flow metering on the check valve can solve the temperature, pressure, flow rate monitoring, flow metering of the pipeline system and the real-time regulation of other equipment (such as motor speed regulation, valve switch) without adding or changing the existing pipeline network equipment, and realize DMA means.

[0009] Generally, when installing an ultrasonic flow measurement device in a check valve, two constraints must be taken into account: one is to ensure the normal operation of the check valve, mainly to not increase the water resistance of the check valve and not change the main structure of the check valve; the other is to meet the conditions for flow, temperature, and pressure measurement, that is, for the use of ultrasound for flow rate monitoring, the validity of its measurement parameters must be guaranteed. To this end, the present invention proposes the following principles:

[0010] (1) Principle of maximizing the range ratio of ultrasonic measurement: When using ultrasonic waves to measure flow, the relationship between the range ratio is derived as follows: increasing the projection distance between the two transducers in the direction of water flow in the flow meter pipeline can effectively improve the range ratio of the flow meter. Therefore, when installing ultrasonic devices in the check valve for flow data measurement, it is necessary to ensure that ultrasonic flow measurement can be performed within a wide range of flow values. In other words, to ensure that ultrasonic measurement has a large range ratio, the paired ultrasonic transducers should be placed as close to the pipe opening as possible to maximize the sound path between the pair of transducers, thereby increasing the measurement range, i.e., the range ratio.

[0011] The relationship between the ultrasonic flow measurement ratio and the distance between the transducers is as follows:

[0012] In the field of water metering, the range ratio R is defined as R=Q3 / Q1, where Q3 is the common flow rate corresponding to a certain pipe diameter, which is a given value; Q1 is the minimum flow rate that meets certain metering accuracy requirements (for example, the metering accuracy of a secondary flowmeter is ±5%).

[0013] The following article, through in-depth analysis and deduction, draws an important conclusion: for the fluid passing through the flow meter pipeline, the measured starting flow (i.e. the minimum flow that the flow meter can sense and measure) Q q The lower (corresponding to its flow rate V q The lower the V q It is related to the time difference chip resolution of the ultrasonic flowmeter and the pipeline structure of the flowmeter). Correspondingly, Q1 should also be proportionally lower (that is, the corresponding minimum flow rate V1 becomes lower). Usually, in practical applications, its empirical value is Q1 = (5~10)Q q (Q1 varies with the overall zero drift of the ultrasonic flowmeter circuit and transducer and the design of the water resistance of the flowmeter pipeline.) Therefore, it can be derived that under a certain caliber (the time intervals used by Q3 and Q1 flowing through the flowmeter pipeline are equal), the relationship between the range ratio R and the distance L between the two transducers is:

[0014]

[0015] In the above formula, Q3 is the common flow rate of a certain caliber flowmeter, V3 is the flow rate of the fluid in the flowmeter pipeline corresponding to Q3, Q1 is the minimum flow rate that meets certain measurement accuracy requirements, V1 is the flow rate of the fluid in the flowmeter pipeline corresponding to Q1, for a certain caliber flowmeter, Q3 and V3 are constants (selected values), π is pi, r is the inner radius of the flowmeter pipeline, t is the measurement time, L is the distance between the two transducer facing surfaces in the ultrasonic flowmeter pipeline, α is the angle between the connecting line between the two transducers in the water flow direction of the flowmeter pipeline (α is an acute angle, when α=0, the connecting line between the two transducers is consistent with the water flow direction, cos(α)=1), k is a known quantity related to the measurement time difference and sound velocity of the flowmeter, β is a known quantity related to the measurement time difference and sound velocity of the flowmeter, let β=V3 / 10k, as a constant, and V1 is calculated by the ultrasonic flowmeter time difference formula V q It is concluded that Therefore, in the specific calculation, V1 is calculated as V1 = 10V q Substitute in. From the above R relationship, we can draw the following conclusion: increasing the projection distance L·cos(α) between the two transducers in the flow direction of the flow meter pipeline can effectively improve the flow meter range ratio R.

[0016] (2) Principle of the opposite-beam installation between ultrasonic transducers: The acoustic wave signals of the opposite-beam installation are directly transmitted and received by a pair of transducers. In this way, the effective signal amplitude is the strongest. In the case of a check valve, it is best to use an opposite-beam installation structure that is consistent with the direction of water flow.

[0017] (3) Multi-channel principle: that is, multiple pairs of measuring transducers are set at different heights in the check valve pipeline. First, the flow velocity / flow rate of the flowing fluid can be monitored when the check valve is at different openings (including open and closed), that is, pairs of ultrasonic transducers are set at different heights in the check valve; second, the flow measurement in the check valve can be more accurate and reliable. This is because, in addition to being able to calculate the fluid at different fluid levels in the pipeline separately and improve the measurement precision and accuracy, the multi-channel is also an important guarantee for the safety and reliability of measurement, because as long as a pair of transducers are working, the measurement can be carried out.

[0018] (4) Low pressure loss principle: In order not to increase the resistance of the valve, the ultrasonic transducer installation structure should be as small as possible and a guide cover should be installed on the water-facing surface.

[0019] (5) Pipe sealing safety principle: Whether it is the installation of the ultrasonic transducer or the pressure sensor and the protection of its signal lead-out wires, a high level of safety and protection must be achieved to ensure the reliability and durability of the equipment.

[0020] (6) The check valve flowmeter has a simple structure (few components) and is easy to assemble: the structure is simplified and the installation has a unique certainty, so the overall assembly is easy, with high consistency and low cost.

[0021] At present, no cases have been found that use check valves to achieve a complete technical solution for flow measurement / metering. Utility Model Content

[0022] This application proposes a device that uses ultrasonic technology to monitor the flow rate of fluid and measure the flow rate in a check valve. Its purpose is to provide a hardware carrier for the real-time flow, pressure and temperature values ​​of each pipeline node in the pipeline network for the implementation of DMA and to cooperate with other equipment for remote automatic control. Therefore, in addition to being used for fluid allocation and balancing purposes, it is more important to solve the implementation means of DMA, that is, to solve the current problems of imbalance in production and sales and serious leakage in the water supply network.

[0023] According to the requirements of the standards of the above 6 principles, the technical solution of the utility model is: a small-sized transducer fixing column with a transducer mounting hole is used to install a small equal-diameter transducer, and the transducer fixing column is completed by injection molding to ensure high consistency and low cost; the transducer fixing column is embedded, positioned and fixed at the flow channel opening of the flange position on both sides of the check valve, so as to realize the positioning and fixing of the multi-channel transducer and maximize the effective sound path between a pair of transducers, that is, maximize the fluid measurement range ratio; the transducer signal line passes through the inside of the transducer fixing column and then through the wire protection tube connected to the inner side of the flange and the inner hole of the valve body cover, and then reaches the instrument box and the integrator circuit. PCB connection; similarly, a pressure sensor is installed in the flange, and its signal line is also connected to the integrating circuit PCB through the above-mentioned passage; in this way, whether it is the compact and reasonable installation structure of the multi-channel transducer or the way in which the signal line is led out to the integrating circuit PCB through the flange and the internal channel of the valve body cover, it reflects the overall simple structure and complete functions, and achieves the maximum range ratio function of flow measurement / metering with fewer device requirements, and cooperates with real-time pressure data acquisition and temperature data calculation (liquid temperature / sound speed is linearly related), to achieve the goal of using a check valve to complete real-time monitoring of flow velocity / flow, temperature, and pressure and to cooperate with other equipment to achieve remote control of the pipeline network.

[0024] The utility model is a check valve with temperature, pressure, flow rate monitoring and flow metering, which is characterized by: comprising flange 1 and flange 2, valve shell 1, check plate, valve body cover, hole 4, transducer fixing column, insert, hexagonal external thread plug 1, transducer, signal line, fixed sealing head 1, wire protection tube 1, pressure sensor, instrument box 1; the check valve body is a structure with flange 1 and flange 2 at both ends of the valve shell 1, a check plate inside, and sealed by the valve body cover; at the flow channel openings located at the flange positions at both ends of the check valve, that is, in cooperation with notch 1 and notch 2, an upper fixing block and a lower fixing block are respectively embedded, and the transducer fixing column is installed, that is, the position of the transducer fixing column is aligned with the flange; the fixed sealing head 1 is located in the hole 1, and part of it extends into the positioning cavity to position and seal the upper end of the transducer fixing column; the The transducer is embedded in the inner cavity on the transducer fixing column, and the positioning surface 2 contacts and positions the positioning platform 2; the hexagonal external thread plug 1 penetrates into the positioning hole at the lower end of the transducer fixing column through the long rod at its lower end to position the lower end of the transducer fixing column; the transducer signal line enters the instrument box 2 from the fixed sealing head 1 through the through hole in the positioning cavity at the upper end of the transducer fixing column through the inside of the flange, the wire protection tube 1, the hole 5 and the middle hole to be connected with the integrating circuit PCB 1; the pressure sensor is installed in the hole 2 of the flange, and its signal line enters the instrument box 2 through the inside of the flange, the wire protection tube 2, the wire protection tube 1, the hole 5 and the middle hole to be connected with the integrating circuit PCB 1; the valve body cover has the hole 5 and the middle hole, and is an integrated structure with the instrument box 1; the above structure constitutes a check valve with temperature, pressure, flow rate monitoring and flow metering.

[0025] The lower end of the fixed sealing head 1 is in the positioning cavity and is in contact and sealed with the side of the positioning cavity through a sealing ring 2; further, the upper end of the fixed sealing head 1 is in a hole 1 in the flange and is positioned by a positioning platform 1; further, the top of the fixed sealing head 1 is in contact and sealed with an inner wall of the hole 1 by a sealing ring 1; in addition, the fixed sealing head 1 is fixed by a hexagon socket external thread nut 1 through a gasket 1, and finally a hexagon socket external thread plug 2 is screwed into the hole 1 to seal the hole.

[0026] The hexagonal external thread plug is screwed into the hole three, and the sealing gasket is pressed and sealed by the gasket two. The long rod at its lower end penetrates into the positioning hole at the lower end of the transducer fixing column to position the lower end of the transducer fixing column. The positioning hole is a blind hole. The hexagonal external thread plug is screwed into the hole three to seal the hole three.

[0027] The insert is embedded and installed in the notch three on the air deflector. Furthermore, the side surface one and the side surface two overlap with the side wall of the notch three, and the positioning surface one contacts and is positioned with the inner surface of the notch three.

[0028] The pressure sensor is installed in hole 2 of the flange without protruding its head and is positioned by positioning platform 3; further, the side and top of the pressure sensor are respectively sealed in contact with the inner wall of hole 2 by sealing ring 6 and sealing ring 5, and the pressure sensor is fixed by hexagon socket external thread nut 2 through gasket 3, and hexagon socket external thread plug 2 is screwed into hole 2 to seal hole 2.

[0029] After the pin is inserted into the hole four to fix the check plate, the hole four is welded closed.

[0030] In summary, the utility model realizes a check valve with temperature, pressure, flow rate monitoring and flow metering, and its technical characteristics and benefits are as follows:

[0031] First, the goal of maximizing the measured sound range, that is, maximizing the range ratio, is achieved: the ultrasonic transducer in the utility model is installed in the transducer fixing column, and at the flow channel opening at the flange position on both sides of the valve shell, that is, in cooperation with the notch one and the notch two, the upper fixing block and the lower fixing block are respectively embedded, and the transducer fixing column is installed, and its position is aligned with the flange position. In this way, the distance between a pair of transducers reaches the maximum value, that is, the check valve can obtain the maximum fluid measurement range ratio.

[0032] Secondly, the transducer counter-beam multi-channel installation is realized: the two rows of transducers on the transducer fixing columns at the flow channel openings on both sides of the check valve are counter-beamed. Multiple transducers can be densely installed on each row, so that the fluid flow rate / flow rate during passing / disconnecting can be fully measured when the check plate is at different openings (the flow rate is zero when the check plate is closed). In particular, when the check plate is opened and located at a certain height, the height of the flow channel liquid can be determined based on the on-off judgment of the signal received by the counter-beam transducer, and after a period of time t, the corresponding flow rate flowing through the gate valve can be calculated.

[0033] Third, low pressure loss is achieved: the utility model adopts an equal-diameter transducer with a diameter of 10 mm, which is embedded and installed in the inner cavity of the transducer fixing column and has an outer diameter of 12 mm; there is a guide cover on the water-facing surface, so the technical solution of the utility model has little resistance to fluid flow.

[0034] Fourth, the seal of the check valve body is safe and reliable: the transducer of the utility model and the inner cavity on the transducer fixing column are tightly fitted and glued and fixed, which is very reliable; similarly, after the signal line is routed, the insert is glued and embedded in the notch three installed on the guide cover for fixation; the only signal line outlet, that is, the positioning cavity is positioned by a fixed sealing head one, and is sealed with the positioning cavity and the side of hole one through multiple seals; similarly, the pressure sensor installed in flange hole two is also sealed with two sealing rings; after the pin is inserted into the hole four to fix the check plate, the hole four is welded and closed; the valve shell one of the check valve is sealed by the valve body cover pressing the sealing gasket two; the middle hole is sealed with sealant to prevent waterproof immersion in the instrument box two; therefore, the overall seal of the check valve is safe and reliable.

[0035] Fifth, the structure is simple, easy to install and low cost: the technical solution of the utility model integrates the instrument box 1 and the valve body cover into an integrated structure; multiple groups of equal-diameter transducers are installed in a smaller-sized transducer fixing column, and their fixation, sealing and the sealing of the transducer signal line, and the sealing and fixing of the pressure sensor are all completed in the flange, the wire protection tube 1 and the valve body cover, which simplifies the structure, is easy to install and has a low cost.

[0036] Sixth, the check valve of the utility model can measure pressure and temperature parameters: the utility model installs the pressure sensor in the flange, and its pressure measuring head does not extend into the pipeline, so it does not affect the flow of the fluid; since the ultrasonic time difference method is used to measure the flow velocity of the fluid, and the sound velocity and temperature are linear functions, by measuring the time t1 and t2 used for the downstream and upstream flow, and knowing the transducer spacing L, the fluid flow velocity v and the corresponding sound velocity c at the temperature can be solved. x , know c x The temperature T under this condition can be obtained through the linear relationship table x , its accuracy value is ≤0.01, which can meet most practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the appearance of a check valve with temperature, pressure, flow rate monitoring and flow metering;

[0038] Figure 2 It is a cross-sectional view of the check plate of the check valve in the fully closed position;

[0039] Figure 3 It is a cross-sectional view of the check plate of the check valve in the fully open position;

[0040] Figure 4 It is a check valve with temperature, pressure, flow rate monitoring and flow metering functions;

[0041] Figure 5 It is a partial cross-sectional view of the equal-diameter transducer and its component structure;

[0042] Figure 6 It is a cross-sectional view of the transducer fixing column and the structure after the transducer is installed;

[0043] Figure 7 is a schematic diagram of the insert structure;

[0044] Figure 8 It is a schematic diagram of the transducer fixing column and transducer installation;

[0045] Fig. 9 is a sectional view of the upper part of the transducer fixing column when it is installed and fixed;

[0046] Fig.10 is a sectional view of the lower part of the transducer fixing column installed and fixed;

[0047] Fig.11 It is a cross-sectional view of the valve cover and instrument box structure;

[0048] Fig.12 This is an exploded view of the transducer fixing post installed on the valve body;

[0049] Fig.13 It is a schematic diagram of the pressure sensor installation structure;

[0050] In the figure:

[0051] 11. Flange 1; 111. Notch 1; 112. Notch 2; 12. Flange 2; 13. Hole 1; 14. Hole 2; 131. Hexagon socket nut 1; 132. Gasket 1; 133. Fixed seal head 1; 1331. Sealing ring 1; 1332. Positioning table 1; 1333. Sealing ring 2; 134. Hole 3; 1341. Hexagon socket plug 1; 1342. Gasket 2; 1343. Sealing pad 1; 25. Hexagonal external thread plug 2; 26. Hexagonal internal thread plug 3; 15. Valve housing 1; 151. Check plate; 152. Connecting rod; 153. Pin; 16. Valve housing 2; 161. Sealing gasket 2; 162. Hole 4; 17. Valve body cover; 171. Screw; 172. Hole 5; 173. Middle hole; 18. Instrument box 1; 181. Clamping hoop; 182. Glass; 183. Display screen; 184. PCB 1; 185. Battery; 1 86. Instrument box 2; 187. Sealing ring 4; 19. Rivet plug; 191. Hole 6; 22. Transducer fixing column; 221. Upper fixing block; 2211. Positioning shell; 2212. Positioning cavity; 222. Lower fixing block; 2221. Positioning hole; 231. Notch 3; 232. Positioning platform 2; 233. Air guide cover; 234. Inner cavity; 24. Insert; 241. Side 1; 242. Positioning surface 1; 243. Channel 1; 244. Side 2; 33. Transducer; 331. Sound-conducting surface; 332. Ceramic sheet; 333. PCB 2; 334. Protrusion 1; 335. U-shaped groove; 336. Positioning surface 2; 34. Signal line; 41. Wire protection tube 1; 42. Wire protection tube 2; 141. Hexagon socket nut 2; 142. Gasket 3; 144. Pressure sensor; 1441. Sealing ring 5; 1442. Positioning platform 3; 1443. Sealing ring 6. DETAILED DESCRIPTION

[0052] The implementation of the utility model is further described in detail below with reference to the accompanying drawings and examples.

[0053] Embodiment 1:

[0054] As attached Figure 1 , 2As shown in Figures 9 and 11, this embodiment is a DN150 check valve with temperature, pressure, flow rate monitoring and flow metering. It is characterized by: including flange 11 and flange 2 12, valve housing 15, check plate 151, valve body cover 17, hole 4 162, transducer fixing column 22, insert 24, hexagonal external thread plug 1341, transducer 33, signal line 34, fixed sealing head 133, wire protection tube 41, pressure sensor 144, instrument box 18; the check valve body is the valve housing 15 with flange 11 and flange 2 12 at both ends, and contains check plate 151 inside, and is composed of valve body cover 1 7 sealing structure; at the flow channel openings located at the flange positions at both ends of the check valve, that is, in cooperation with the notch 111 and the notch 2 112, the upper fixing block 221 and the lower fixing block 222 are respectively embedded, and the transducer fixing column 22 is installed, that is, the transducer fixing column 22 is aligned with the flange; the fixed sealing head 133 is located in the hole 13, and its part extends into the positioning cavity 2212 to position and seal the upper end of the transducer fixing column; the transducer 33 is embedded in the upper end of the transducer fixing column 22 The inner cavity 234, the positioning surface 236 contacts and positions the positioning platform 232; the inner hexagonal external thread plug 1341, through the long rod at its lower end, penetrates into the positioning hole 2221 at the lower end of the transducer fixing column to position the lower end of the transducer fixing column 22; the transducer signal line 34 enters the instrument box 2 186 and the instrument box 2 through the fixed sealing head 133 through the through hole in the positioning cavity 2212 at the upper end of the transducer fixing column 22, through the flange, the wire protection tube 141, the hole 5 172 and the middle hole 173 The integrator circuit PCB-184 is connected; the pressure sensor 144 is installed in the hole 2 14 of the flange, and its signal line enters the instrument box 2 186 through the inside of the flange, the wire protection tube 2 42, the wire protection tube 1 41, the hole 5 172 and the middle hole 173 to be connected with the integrator circuit PCB-184; the valve body cover 17 has the hole 5 172 and the middle hole 173, and is an integrated structure with the instrument box 18; the above structure constitutes a check valve with temperature, pressure, flow rate monitoring and flow metering.

[0055] As attached Fig. 9 As shown, the lower end of the fixed sealing head 133 is in the positioning cavity 2212, and is in contact and sealed with the side of the positioning cavity 2212 through a sealing ring 1333; further, the upper end of the fixed sealing head 133 is in the hole 13 in the flange, and is positioned by a positioning platform 1332; further, the top of the fixed sealing head 133 is in contact and sealed with the inner wall of the hole by a sealing ring 1331; in addition, the fixed sealing head 133 is pressed and fixed by a hexagon socket external thread nut 131 through a gasket 132, and finally the hexagon socket external thread plug 25 is screwed into the hole 13 to seal the hole.

[0056] As attached Fig.10As shown, the hexagonal external thread plug 1341 is screwed into the hole 134, and the sealing gasket 1343 is pressed and sealed by the gasket 1342. The long rod at the lower end thereof penetrates into the positioning hole 2221 at the lower end of the transducer fixing column to position the lower end of the transducer fixing column 22. The positioning hole 2221 is a blind hole. The hexagonal external thread plug 26 is screwed into the hole 134 to seal the hole 134.

[0057] As attached Figure 7 , 12 As shown, the insert 24 is embedded and installed in the gap three 231 on the air guide cover 233. Furthermore, the side surface 1 241 and the side surface 244 overlap with the side wall of the gap three 231, and the positioning surface 1 242 contacts and positions the inner surface of the gap three.

[0058] As attached Fig.13 As shown, the pressure sensor 144 is installed in the second hole 14 of the flange without protruding its head, and is positioned by the positioning platform three 1442; further, the side and top of the pressure sensor 144 are respectively sealed in contact with the inner wall of the second hole 14 by the sealing ring six 1443 and the sealing ring five 1441, and the pressure sensor is tightened and fixed by the hexagon socket external thread nut two 141 through the gasket three 142, and the hexagon socket external thread plug two 25 is screwed into the second hole 14 to seal the second hole.

[0059] As attached Figure 1 As shown, after the pin 153 is inserted into the hole 162 to fix the check plate 151, the hole 162 is welded closed.

[0060] As attached Figure 2 As shown, the edge of the check plate 151 is wedge-fitted with the interior of the valve housing 15.

[0061] A DN150 caliber check valve with temperature, pressure, flow rate monitoring and flow metering, the assembly process is as follows:

[0062] 1. As attached Figure 5 , 8 As shown, the transducer 33 is coated with epoxy resin, and the second positioning surface 336 is embedded and installed in the inner cavity 234 of the transducer fixing column 22 and cooperates with the second positioning platform 232. The signal line is as shown in the attached Fig.12 shown.

[0063] 2. As attached Fig.12 As shown, the assembled transducer fixing column 22 and the transducer 33 are embedded in the flow channel opening, wherein the upper fixing block 221 matches the notch 1111, and the lower fixing block 222 matches the notch 2 112.

[0064] 3. As attached Fig.12 , 9As shown, the signal line 34 is folded back from the gap 3 231 and passed along the channel in the transducer fixing column to the hole 13, and the insert 24 is coated with epoxy resin and embedded in the gap 3 231 installed on the guide cover 233 to close the gap 3 231.

[0065] 4. As attached Fig. 9 , 10 As shown in 13, a fixed sealing head 133, a hexagonal external thread plug 1341, a pressure sensor 144 and other accessories are installed.

[0066] 5. As attached Figure 2 As shown, the check plate 151 and the connecting rod 152 are placed in the valve housing 15, the check plate 151 is fixed with the pin 153 passing through the hole 162, the valve body cover 17 is covered, the screw 171 is tightened, and finally the hole 162 is welded and closed to prevent water leakage.

[0067] 6. As attached Figure 4 , 9 As shown, glue is applied to both ends of the wire protection tube 41, one end is inserted into the hole 5 172, and the other end is inserted into the hole 6 191. After the signal line is passed through, the rivet plug 19 is covered, and the middle hole 173 is sealed with sealant to prevent water from immersing in the instrument box 2.

[0068] 7. As attached Fig.11 As shown, put the instrument box 2 186 into the instrument box 1 18, install PCB 1, etc., and connect the signal line to PCB 1; add the sealing ring 4 187, buckle the glass 182, and tighten the clamp 181.

[0069] Through the above examples, the implementation and application of the utility model, a DN150 caliber check valve with temperature, pressure, flow rate monitoring and flow metering, is described. However, the utility model is not limited to the above specific embodiments, and any changes or deformations made based on the content of the utility model belong to the scope of protection required by the utility model.

Claims

1. A check valve with temperature, pressure, flow rate monitoring and flow metering, characterized in that : comprising flange 1 (11) and flange 2 (12), valve housing 1 (15), check plate (151), valve body cover (17), hole 4 (162), transducer fixing column (22), insert (24), internal hexagonal external thread plug 1 (1341), transducer (33), signal line (34), fixed sealing head 1 (133), wire protection tube 1 (41), pressure sensor (144), instrument box 1 (18); the check valve body is the valve housing 1 (15) with flange 1 (11) and flange 2 (12) at both ends, and contains check plate (151) inside , a structure sealed by a valve body cover (17); at the flow channel openings located at the flange positions at both ends of the check valve, the upper fixing block (221) and the lower fixing block (222) are respectively embedded in cooperation with the notch 1 (111) and the notch 2 (112), and the transducer fixing column (22) is installed, that is, the position of the transducer fixing column (22) is aligned with the flange; the fixed sealing head 1 (133) is located in the hole 1 (13), and its part extends into the positioning cavity (2212) to position and seal the upper end of the transducer fixing column (22); the transducer (33) is embedded in cooperation with the transducer fixing In the inner cavity (234) on the column (22), the second positioning surface (336) contacts and positions the second positioning platform (232); the inner hexagonal external thread plug (1341) penetrates into the positioning hole (2221) at the lower end of the transducer fixing column through the long rod at its lower end to position the lower end of the transducer fixing column (22); the signal line (34) enters the instrument box (186) from the fixed sealing head (133) through the through hole in the positioning cavity (2212) at the upper end of the transducer fixing column (22) via the inside of the flange, the wire protection tube (41), the fifth hole (172) and the middle hole (173) ) is connected to the integrating circuit PCB one (184); the pressure sensor (144) is installed in the second hole (14) of the flange, and its signal line enters the instrument box two (186) through the inside of the flange, the second wire protection tube (42), the first wire protection tube (41), the fifth hole (172) and the middle hole (173) to be connected to the integrating circuit PCB one (184); the valve body cover (17) has the fifth hole (172) and the middle hole (173) in it, and is an integrated structure with the instrument box one (18); the above structure constitutes a check valve with temperature, pressure, flow rate monitoring and flow metering.

2. A check valve with temperature, pressure, flow rate monitoring and flow metering according to claim 1, characterized in that: The lower end of the fixed sealing head (133) is in the positioning cavity (2212) and is in contact and sealed with the side of the positioning cavity (2212) through a sealing ring (1333); further, the upper end of the fixed sealing head (133) is in a hole (13) in the flange and is positioned by a positioning platform (1332); further, the top of the fixed sealing head (133) is in contact and sealed with the inner wall of the hole by a sealing ring (1331); in addition, the fixed sealing head (133) is fixed by a hexagon socket external thread nut (131) through a gasket (132), and a hexagon socket external thread plug (25) is screwed into the hole (13) to seal the hole.

3. A check valve with temperature, pressure, flow rate monitoring and flow metering according to claim 1, characterized in that: The hexagonal external thread plug (1341) is screwed into the third hole (134), and is sealed by pressing the sealing gasket (1343) through the gasket (1342). The long rod at the lower end thereof penetrates into the positioning hole (2221) at the lower end of the transducer fixing column to position the lower end of the transducer fixing column (22). The positioning hole (2221) is a blind hole. The hexagonal external thread plug (26) is screwed into the third hole (134) to seal the third hole.

4. A check valve with temperature, pressure, flow rate monitoring and flow metering according to claim 1, characterized in that: The insert (24) is embedded in the notch three (231) installed on the air guide cover (233). Furthermore, the side surface one (241) and the side surface two (244) overlap with the side wall of the notch three (231), and the positioning surface one (242) contacts and positions the inner surface of the notch three.

5. A check valve with temperature, pressure, flow rate monitoring and flow metering according to claim 1, characterized in that: The pressure sensor (144) is installed in the second hole (14) of the flange without protruding its head, and is positioned by the third positioning platform (1442); further, the side and top of the pressure sensor (144) are respectively in contact and sealed with the inner wall of the second hole (14) by the sixth sealing ring (1443) and the fifth sealing ring (1441), and the pressure sensor is fixed by the second hexagon socket external thread nut (141) through the third gasket (142), and the second hexagon socket external thread plug (25) is screwed into the second hole (14) to seal the second hole.

6. A check valve with temperature, pressure, flow rate monitoring and flow metering according to claim 1, characterized in that: After the pin (153) is inserted into the hole (162) to fix the check plate (151), the hole (162) is welded and closed.

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