Split type combined parameter instrument

Abstract

The present invention provides a split type combined parameter instrument, comprising: a meter head assembly; a combined sensor, the upper end of the combined sensor is connected to the lower end of the meter head assembly, the combined sensor is provided with a pressure sensor, a micro differential pressure sensor, a temperature signal line and a signal conversion circuit, the lower end of the combined sensor is provided with a tubular first split connector, the first split connector is provided with two differential pressure signal input channels and a temperature signal input line plug; a three-valve group, the upper end of the three-valve group is provided with a tubular second split connector, the second split connector is used for detachably connecting with the first split connector, the second split connector is provided with a differential pressure signal output channel connected to the differential pressure signal input channel and a temperature signal line socket connected to the temperature signal input line plug; a Pitot tube probe, the Pitot tube probe is installed at the lower end of the three-valve group through a probe protective tube and a sealing fastener, and the Pitot tube probe is provided with a temperature sensor.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, and in particular to a split type combined parameter instrument. Background Art

[0002] At present, when monitoring the flow rate of gas pipelines, vent pipes, etc., the installation method of various flow meters is mostly to cut off a section of the pipeline, weld flanges at the front and rear cut-off points, and then use multiple bolts to fasten the instrument detection body during installation. The flow meters using the above installation method are not convenient to install and maintain. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a split type combined parameter meter, which is simple and convenient to install and maintain, has multiple functions, a compact structure, a small size and a low cost.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A split type combined parameter instrument comprises: a meter head assembly, the meter head assembly comprises a housing, a display screen and a switch arranged on the front side of the housing, a circuit main board and a wiring terminal arranged in the housing, and a terminal cover arranged on the rear side of the housing; a combined sensor, the upper end of the combined sensor is connected to the lower end of the meter head assembly, the combined sensor is provided with a pressure sensor, a micro differential pressure sensor, a temperature signal line and a signal conversion circuit, the lower end of the combined sensor is provided with a tubular first split connector, the first split connector is provided with two differential pressure signal input channels and a temperature signal input line plug; a three-valve group, the upper end of the three-valve group is provided with a tubular second split connector, the second split connector is used for detachably connecting with the first split connector, the second split connector is provided with a differential pressure signal output channel for connecting with the differential pressure signal input channel and a temperature signal line socket for connecting with the temperature signal input line plug; a pitot tube probe, the pitot tube probe is installed at the lower end of the three-valve group through a probe protective tube and a sealing fastener, and the pitot tube probe is provided with a temperature sensor.

[0006] The housing is an explosion-proof aluminum housing, and the terminal cover includes an explosion-proof joint.

[0007] The switch includes a reed switch.

[0008] The first split connector is an external thread connector, and the second split connector is an internal thread connector.

[0009] When the first split connector is connected to the second split connector, a sealing ring is provided between the first split connector and the second split connector.

[0010] There are valve seats for two channels in the valve body of the three-valve group, the lower one is the input channel, and the upper one is the output channel. A left stop valve and a right stop valve are respectively provided in the middle of the two channels, and a balancing valve is bridged between the output channels. Output channel sealing rings are provided on the left and right sides of the upper plane, and the temperature signal line socket is provided in the center of the upper plane.

[0011] The sealing fastener comprises a fastening joint and a fastening nut.

[0012] Beneficial effects of the present invention:

[0013] The present invention can directly utilize the sampling joint of the original pressure gauge of the measured pipeline by arranging the Pitot tube probe, or pre-open the installation hole on the measured pipeline to install the installation joint. Therefore, there is no need to cut the pipe for welding flange installation, and the installation is simple. Through the split design of the header assembly and the combined sensor part and the three-valve group and the Pitot tube probe part, the header assembly and the sensor can be easily replaced, and subsequent components can be installed, and the installation and maintenance are simple and convenient. The pressure and micro-differential pressure combined sensor is adopted, and the pressure signal sampling is also taken into account while obtaining the differential pressure signal sampling. At the same time, by arranging the temperature sensor and taking into account the unobstructed signal line of the temperature sensor, the simultaneous collection of the three signals can be realized. The present invention has more functions, compact structure and small size, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of a split type combined parameter instrument according to an embodiment of the present invention;

[0015] Figure 2 It is a side view of a split type combined parameter instrument after being split according to an embodiment of the present invention;

[0016] Figure 3 This is a front view of a split type combined parameter instrument after being split according to an embodiment of the present invention;

[0017] Figure 4 The figure is a schematic diagram of the partial internal structure of a split type combined parameter meter according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1-header assembly, 2-combination sensor, 3-three-valve group, 4-Pitto tube probe;

[0020] 11-housing, 12-display screen, 13-switch, 14-circuit board, 15-wiring terminal, 16-terminal cover, 17-explosion-proof connector, 18-screw, 19-tempered glass;

[0021] 21-pressure sensor, 22-micro differential pressure sensor, 23-temperature signal line, 24-first split connector, 25-differential pressure signal input channel, 26-temperature signal input line plug, fixed connector 27;

[0022] 31-second split connector, 32-differential pressure signal output channel, 33-temperature signal line socket, 34-left stop valve, 35-right stop valve, 36-balancing valve, 37-sealing anastomosis ring, 38-sealing ring;

[0023] 41-probe protective tube, 42-temperature sensor, 43-Pitot total pressure tube, 44-Pitot static pressure tube, 45-lead wire, 46-fastening connector, 47-fastening nut. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the split type combined parameter instrument of the embodiment of the present invention comprises a meter head assembly 1, a combined sensor 2, a three-valve group 3 and a Pitot tube probe 4. Figure 2 , Figure 3 and Figure 4 As shown, the meter head assembly 1 includes a housing 11, a display screen 12 and a switch 13 arranged on the front side of the housing 11, a circuit board 14 and a wiring terminal 15 arranged in the housing 11, and a terminal cover 16 arranged on the rear side of the housing 11; the combined sensor 2 is provided with a pressure sensor 21, a micro differential pressure sensor 22, a temperature signal line 23 and a signal conversion circuit, and a tubular first split connector 24 is provided at the lower end of the combined sensor 2, and two differential pressure signal input channels 25 and a temperature signal input line 23 are provided in the first split connector 24. Plug 26; a tubular second split connector 31 is provided at the upper end of the three-valve group 3, and the second split connector 31 is used to be detachably connected to the first split connector 24. The second split connector 31 is provided with a differential pressure signal output channel 32 for connecting to the differential pressure signal input channel 25 and a temperature signal line socket 33 for connecting to the temperature signal input line plug 26; the Pitot tube probe 4 is installed at the lower end of the three-valve group 3 through the probe protective tube 41 and the sealing fastener, and the Pitot tube probe 4 is provided with a temperature sensor 42.

[0026] In one embodiment of the present invention, the housing 11 is an explosion-proof aluminum housing. Figure 2As shown, the terminal cover 16 includes an explosion-proof joint 17. The above-mentioned explosion-proof design can improve the safety of the split-type combined parameter instrument when applied to various gas pipelines, vent pipes and other scenes of gas pressure regulating stations. Figure 2 and Figure 3 As shown, the front and rear parts of the housing 11 can be fixed by screws 18, and the meter head assembly 1 can also include a tempered glass 19. In one embodiment of the present invention, the switch 13 can include a reed switch that is turned on by magnetic induction, and a magnetic body can be used to approach the confirmation key, the up key and the down key mark below the tempered glass 19, so that the reed switches at the left, middle and right positions where the tempered glass 19 is installed can be magnetically inductively operated respectively. Therefore, a magnetic tool can be used to approach the magnetic induction reed switch to turn it on, so that it becomes an anti-misoperation magnetic induction isolation setting key that can input the measured pipeline diameter data, and the setting data of the measured pipeline diameter can be displayed on the display screen.

[0027] In one embodiment of the present invention, an internal threaded hole may be provided at the lower end of the meter head assembly 1, which is threadedly fixed to a fixed joint 27 having external threads at the upper end of the combined sensor 2, so that the meter head assembly 1 and the combined sensor 2 constitute the upper part of a split-type combined parameter meter.

[0028] In one embodiment of the present invention, there are valve seats with two channels in the valve body of the three-valve group 3, the lower one is the input channel and the upper one is the output channel. Figure 2 , Figure 3 and Figure 4 As shown, a left stop valve 34 and a right stop valve 35 are respectively provided in the middle of the two channels, a balancing valve 36 is bridged between the output channels, the left and right output channels 32 on the upper plane are connected to two sealing jacks provided with contact copper sheets, and an output channel sealing matching ring 37 is provided, and a temperature signal line socket 33 is provided in the center of the upper plane.

[0029] like Figure 2 , Figure 3 and Figure 4 As shown, the Pitot tube probe 4 may include a Pitot total pressure tube 43 and a Pitot static pressure tube 44, and the temperature sensor 42 may be arranged between the Pitot total pressure tube 43 and the Pitot static pressure tube 44, and connected to the temperature signal line socket 33 through a lead wire 45. The Pitot tube probe 4 may be inserted into the probe protective tube 41, and the sealing fastener includes a fastening joint 46 and a fastening nut 47. The probe protective tube 41 may be welded to the lower end of the three-valve group 3, and the Pitot tube probe 4 may be fixed in the probe protective tube 41 by the cooperation of the fastening nut 47 and the fastening joint 46, so that the Pitot tube probe 4 and the three-valve group 3 constitute the lower part of the split type combined parameter instrument.

[0030] In a specific embodiment of the present invention, the Pitot tube probe 4 and the probe protection tube 41 may both be made of stainless steel.

[0031] In one embodiment of the present invention, the first split connector 24 can be an external thread connector, and the second split connector 31 can be an internal thread connector. When the first split connector 24 is connected to the second split connector 31, a sealing ring 38 can be provided between the first split connector 24 and the second split connector 31. The upper part and the lower part can be connected by connecting the first split connector 24 at the lower end of the combined sensor 2 and the second split connector 31 at the upper end of the three-valve group 3. When the upper and lower parts are connected, the external thread connector and the internal thread connector can be tightened to form a tight and sealed connection that isolates the upper and lower parts from the external atmospheric environment, and the plug-type differential pressure signal input channel 25 can be inserted into the sealed jack provided with a contact copper sheet connected to the differential pressure signal output channel 32, that is, the differential pressure signal source is connected, and the temperature signal input line plug 26 can be inserted into the temperature signal line socket 33, that is, the temperature signal source is connected, so that the upper and lower parts constitute an integral instrument.

[0032] When in use, after the on-site pipeline installation of the split-type combination parameter instrument is ready, the depth and angle can be adjusted, and then the fastening nut is tightened, and then the terminal cover with the explosion-proof connector on the rear side of the shell of the head assembly is unscrewed, and the four-core rubber wire is passed through the holes of the explosion-proof connector and the terminal cover. The wiring terminal is connected to a 16V~24V DC regulated power supply and an RS485 communication line, the terminal cover is covered, and then the split-type combination parameter instrument is powered on. Then perform the following three steps on the three-valve group (when not in use, the balancing valve of the three-valve group is in the on state, and the left and right stop valves are in the closed state): S1. Before increasing the pressure in the measured pipeline, first check that the balancing valve of the three-valve group should be in the open state, and the left and right stop valves should be in the closed state, otherwise restore the specified state; S2. Use special tools to first unscrew the balancing valve to the on state, and then unscrew the left and right stop valves to the on state respectively; S3. Check whether the display screen of the split-type combination parameter instrument is abnormal, and then close the balancing valve after confirming that there is no abnormality (when it is necessary to replace the header assembly and the combination sensor, that is, the upper part, first open the balancing valve, then close the left and right stop valves, close the measuring channel, and then use tools to unscrew the internal and external threaded connectors, remove the header assembly and the combination sensor). At this time, if there is medium flowing in the measured pipeline, the display screen of the split-type combination parameter instrument will have digital display. Then use a magnetic body to approach the isolation setting key, input the pipe diameter data of the measured pipe, and then press the OK key to complete the setting. In addition, you also need to select the RS485 communication address.

[0033] The embodiment of the present invention adopts RS485 communication protocol to realize remote monitoring and data storage functions, which is convenient for management and maintenance.

[0034] The embodiment of the present invention uses the Pitot tube measurement principle to perform micro-differential pressure detection on the gas pipeline flow, and can collect the fluid flow velocity at the center of the pipeline (total pressure-static pressure=dynamic pressure), and then multiply it by the cross-sectional area of ​​the measured pipeline (flow rate=center flow velocity×cross-sectional area), and automatically convert it into the working condition flow rate and standard condition flow rate of the fluid.

[0035] According to the split-type combined parameter instrument of the embodiment of the present invention, by setting the Pitot tube probe, the sampling joint of the original pressure gauge of the measured pipeline can be directly used, or the installation joint can be installed by pre-opening the installation hole on the measured pipeline. Therefore, there is no need to cut the pipe for welding flange installation, and the installation is simple; through the split design of the header assembly and the combined sensor part and the three-valve group and the Pitot tube probe part, the header assembly and the sensor can be easily replaced, and subsequent components can be installed, and the installation and maintenance are simple and convenient; the pressure and micro-differential pressure combination sensor is adopted, and the pressure signal sampling is also taken into account while obtaining the differential pressure signal sampling. At the same time, by setting the temperature sensor and taking into account the unobstructed signal line of the temperature sensor, the simultaneous collection of the three signals can be realized, the function is more, the structure is compact, and the volume is small, thereby reducing the cost.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A split type combined parameter instrument, characterized in that: include: A meter head assembly, the meter head assembly comprising a housing, a display screen and a switch arranged on the front side of the housing, a circuit board and wiring terminals arranged in the housing, and a terminal cover arranged on the rear side of the housing; A combined sensor, the upper end of which is connected to the lower end of the meter head assembly, the combined sensor is provided with a pressure sensor, a micro differential pressure sensor, a temperature signal line and a signal conversion circuit, and the lower end of the combined sensor is provided with a tubular first split connector, the first split connector is provided with two differential pressure signal input channels and a temperature signal input line plug; A three-valve group, wherein the upper end of the three-valve group is provided with a tubular second split connector, the second split connector is used to be detachably connected to the first split connector, and the second split connector is provided with a differential pressure signal output channel for connecting to the differential pressure signal input channel and a temperature signal line socket for connecting to the temperature signal input line plug; A Pitot tube probe, wherein the Pitot tube probe is installed at the lower end of the three-valve group through a probe protection tube and a sealing fastener, and a temperature sensor is provided on the Pitot tube probe; The housing is an explosion-proof aluminum housing, and the terminal cover includes an explosion-proof connector; The switch includes a reed switch.

2. The split type combined parameter instrument according to claim 1, characterized in that: The first split connector is an external thread connector, and the second split connector is an internal thread connector.

3. The split type combined parameter instrument according to claim 2, characterized in that: When the first split connector is connected to the second split connector, a sealing ring is provided between the first split connector and the second split connector.

4. The split type combined parameter instrument according to claim 1, characterized in that: There are valve seats for two channels in the valve body of the three-valve group, the lower one is the input channel, and the upper one is the output channel. A left stop valve and a right stop valve are respectively provided in the middle of the two channels, and a balancing valve is bridged between the output channels. Output channel sealing rings are provided on the left and right sides of the upper plane, and the temperature signal line socket is provided in the center of the upper plane.

5. The split type combined parameter meter according to claim 1, characterized in that: The sealing fastener comprises a fastening joint and a fastening nut.

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