Capillary tube flow detection device

Abstract

The utility model discloses a capillary tube flow detection device which comprises a gas source connector, a pressure reducing valve, a thermal type gas mass flow meter and a capillary tube connector which are sequentially connected to the outlet end of the gas source connector through a gas conveying pipe in the flowing direction of gas flow, and a controller. The controller is electrically connected with the thermal gas mass flow meter; compared with the prior art, the thermal gas mass flow meter is adopted to detect and collect flow data, on one hand, the thermal gas mass flow meter is small in size, the size of the whole detection device can be reduced, movement of equipment is facilitated, and detection convenience is improved; on the other hand, the test data of the thermal gas mass flow meter is not influenced by the environment temperature and pressure, the consistency of the data can be well kept, and therefore the precision and reliability of data detection are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental protection equipment, in particular to a capillary flow detection device. BACKGROUND

[0002] Capillary flow detection is a technology for detecting small flow by using capillary principle. At present, capillary flow detection is tested by a single pressure reducing valve cooperating with a float flowmeter reading, and the detection result is affected by environmental temperature, gas source pressure, and operating personnel, etc. Therefore, the detection precision of the above detection device is limited. SUMMARY

[0003] The main purpose of the present application is to provide a capillary flow detection device, which aims to solve the defect of poor detection precision in the prior art.

[0004] The above purpose is achieved by the following technical solutions:

[0005] A capillary flow detection device, comprising a gas source joint;

[0006] A pressure reducing valve, an inlet end of the pressure reducing valve being in communication with the gas source joint;

[0007] A thermal gas mass flowmeter, the thermal gas mass flowmeter being in communication with an outlet end of the pressure reducing valve, and the outlet end of the thermal gas mass flowmeter being further connected with a capillary joint.

[0008] A controller, the controller being electrically connected with the thermal gas mass flowmeter.

[0009] Optionally, the detection device further comprises a housing and a bottom plate connected with each other; the gas source joint, the pressure reducing valve, the thermal gas mass flowmeter, the capillary joint, and the controller are arranged in the housing.

[0010] Optionally, the top of the housing is further provided with a cover plate, and a plurality of carrying handles are hinged to the housing.

[0011] Optionally, the detection device further comprises a digital pressure gauge, the digital pressure gauge being connected with the pressure reducing valve through a bypass pipe.

[0012] Optionally, the controller comprises a flow display instrument and a PCB control board, the PCB control board being electrically connected with the flow display instrument, and the thermal gas mass flowmeter being electrically connected with the PCB control board.

[0013] Optionally, a one-way valve is further arranged between the thermal gas mass flowmeter and the capillary joint, and the one-way valve is opened to an exhaust end of the capillary joint in the direction of gas flow.

[0014] Optionally, the capillary joint comprises a fixed joint and a movable joint connected by screw threads, the fixed joint is arranged on the shell, and the fixed joint is connected with the one-way valve through a gas conveying pipe; the fixed joint is provided with a first air hole, and the movable joint is provided with a second air hole, and the first air hole and the second air hole are in communication with each other.

[0015] Optionally, a plug-in pipe is arranged at the exhaust end of the second air hole along the axis of the second air hole, the inner wall of the plug-in pipe is flush with the second air hole, and the outer wall of the plug-in pipe and the movable joint form a plug-in groove matched with the capillary.

[0016] Optionally, the exhaust end of the plug-in pipe is further provided with a tapered guide surface.

[0017] Optionally, the shell is further provided with a cooling fan and a power supply, and the cooling fan and the power supply are electrically connected with the PCB control panel respectively.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The present application comprises a gas source joint, and the outlet end of the gas source joint is sequentially connected with a pressure reducing valve, a thermal gas mass flow meter and a capillary joint through a gas conveying pipe in the flow direction of the gas flow, and the detection device further comprises a controller, and the controller is electrically connected with the thermal gas mass flow meter.

[0020] In use, the gas source joint is used to connect an external detection gas source, and after the gas enters, the gas first enters the pressure reducing valve through the gas conveying pipe, then passes through the pressure reducing valve, and finally enters the capillary through the capillary joint, so that the detection of the capillary flow is completed.

[0021] Compared with the prior art, the present application adopts the thermal gas mass flow meter to detect and collect the flow data, on the one hand, the thermal gas mass flow meter is small in size, which is conducive to reducing the size of the entire detection device, facilitating the movement of the equipment and improving the convenience of detection; on the other hand, the test data of the thermal gas mass flow meter is not affected by the environmental temperature and pressure, and the consistency of the data can be better maintained, so as to improve the accuracy and reliability of the data detection.

[0022] Secondly, the present application mainly comprises components such as the thermal gas mass flow meter and the pressure reducing valve, and the structure of the entire device is simplified as much as possible, which not only improves the reliability and stability of the equipment, but also reduces the cost of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 Fig. 1 is a structural schematic view of a capillary flow detection device according to Embodiment 1 of the present application;

[0024] Fig. 2 An exploded view of a capillary flow detection device provided for Embodiment 1 of the present application;

[0025] Fig. 3 A structural schematic view of a capillary joint;

[0026] Fig. 4 A sectional view of the capillary joint;

[0027] The reference signs: 1-gas source joint, 2-pressure reducing valve, 3-thermal gas mass flow meter, 4-capillary joint, 5-controller, 6-housing, 7-bottom plate, 8-cover plate, 9-handling handle, 10-digital pressure gauge, 11-bypass pipe, 12-flow display instrument, 13-one-way valve, 14-radiating fan, 15-power supply, 401-fixed joint, 402-movable joint, 403-gas conveying pipe, 404-first air hole, 405-second air hole, 406-plug-in pipe, 407-plug-in slot, 408-guiding surface.

[0028] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0030] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "robot coordinate system and / or m" includes robot coordinate system scheme, or m scheme, or robot coordinate system and m scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of such technical solutions does not exist and is not within the protection scope required by the present application.

[0033] Embodiment 1

[0034] Reference Figs. 1 to 3 The present embodiment is an optional embodiment of the present application, which discloses a capillary flow detection device, which comprises a shell 6, a bottom plate 7 connected to the bottom of the shell 6 by screws, and a cover plate 8 arranged on the top of the shell 6. The cross section of the shell 6 is U-shaped structure, and the cross section of the cover plate 8 is also U-shaped structure. The cover plate 8 is connected to the shell 6 by insertion, thereby forming the entire box body.

[0035] A carrying handle 9 is arranged on both sides of the shell 6. The carrying handle 9 can facilitate and expedite the movement of the entire device, thereby improving the convenience of the device.

[0036] The detection device comprises a gas source connector 1, a pressure reducing valve 2, a thermal gas mass flowmeter 3 and a capillary connector 4. When operating, the side of the shell 6 facing the operator is the front side. The gas source connector 1 is arranged on the front side of the shell 6, and the two carrying handles 9 are arranged on the left side and the right side respectively.

[0037] The pressure reducing valve 2 is arranged in the shell 6 and mounted on the bottom plate 7 by screws. The control switch of the pressure reducing valve 2 is arranged on the front side of the shell 6.

[0038] The inlet end of the pressure reducing valve 2 is connected to the outlet end of the gas source connector 1 through a gas conveying pipe 403. The inlet end of the gas source connector 1 is used to connect an external gas source. The thermal gas mass flowmeter 3 is mounted on the bottom plate 7. The inlet end of the thermal gas mass flowmeter 3 is communicated with the outlet end of the pressure reducing valve 2 through a gas conveying pipe 403.

[0039] The detection device further comprises a digital pressure gauge 10 installed on the front face of the shell 6 for the convenience of the operator to read, which is communicated with the pressure reducing valve 2 through a pipe;

[0040] The outlet end of the thermal gas mass flow meter 3 is further connected with a one-way valve 13 through a gas conveying pipe 403, and a capillary joint 4 is further arranged on the front face of the shell 6, which comprises a fixed joint 401 and a movable joint 402, wherein the fixed joint 401 is installed on the front face of the shell 6, and a stepped hole coaxial with the fixed joint 401 is arranged on the fixed joint 401, the small end of the stepped hole is a first vent hole 404, and the large end is a threaded hole, one end of the movable joint 402 is connected with the threaded hole by screwing, so as to realize the detachable connection of the fixed joint 401 and the movable joint 402; the second vent hole 405 coaxial with the second vent hole 405 is further arranged on the second movable joint 402, and after the fixed joint 401 is connected with the movable joint 402, the first vent hole 404 and the second vent hole 405 are coaxially communicated.

[0041] The inlet end of the first vent hole 404 is communicated with the outlet end of the one-way valve 13 through the gas conveying pipe 403, and along the flow direction of the gas flow, the one-way valve 13 is opened at one end of the fixed joint 401;

[0042] Through the above-mentioned components and the gas conveying pipe 403, a complete gas flow path can be constructed in the detection device, that is, the temperature entering the thermal gas mass flow meter 3 is controlled by the pressure reducing valve 2, and the pressure value is monitored in real time by the digital pressure gauge 10, and then the high-precision detection of the gas flow is realized by the thermal gas mass flow meter 3;

[0043] The arrangement of the one-way valve 13 can ensure the accurate control of the flow direction of the gas flow, and avoid the damage of the gas flow guide device.

[0044] Further, the detection device further comprises a controller 5, which comprises a flow display instrument 12 and a PCB control board, the PCB control board is electrically connected with the flow display instrument 12, and the thermal gas mass flow meter 3 is electrically connected with the PCB control board, wherein the flow display instrument 12 is arranged on the front face of the shell 6 for the convenience of the operator to quickly read the relevant parameters;

[0045] Further, the detection device further comprises a cooling fan 14 and a power supply 15, both of which are arranged on the back face of the shell 6, and the cooling fan 14 and the power supply 15 are respectively electrically connected with the PCB control board;

[0046] The connection with the external power system is realized through the power supply 15, the normal work of the equipment is ensured, and the heat in the working process of the equipment is discharged through the cooling fan 14, so that the temperature inside the shell 6 is kept at the optimal working temperature, and the accuracy of data acquisition is improved.

[0047] Further, an adapter pipe 406 is arranged at the outlet end of the movable joint 402, the inner wall of the adapter pipe 406 is flush with the second vent hole 405, and an adapter slot 407 suitable for the capillary tube is arranged between the outer wall of the adapter pipe 406 and the movable joint 402; and a guide surface 408 in a tapered structure is arranged at the exhaust end of the adapter pipe 406.

[0048] In use, the pipe wall of the capillary tube is inserted into the adapter slot 407, that is, the outer wall of the capillary tube is attached to the inner wall outside the radial direction of the adapter slot 407, and the inner wall of the capillary tube is tightly attached to the outer wall of the adapter pipe 406.

[0049] The guide surface 408 can effectively reduce the difficulty of inserting the capillary tube into the adapter pipe 406, so as to realize accurate and rapid installation of the capillary tube.

[0050] Secondly, since the inner wall and the outer wall of the capillary tube are attached to the movable joint 402 after installation, the above structure can improve the connection strength of the capillary tube and the movable joint 402 as much as possible, and avoid separation of the capillary tube and the movable joint 402 during use.

[0051] Finally, the detachable structure of the fixed joint 401 and the movable joint 402 meets different detection requirements, that is, for capillary tubes of different specifications, different movable joints 402 can be replaced to meet the replacement requirement, and the structure is simple and convenient to operate.

[0052] In use, the gas source joint 1 is used to connect an external detection gas source, after the gas enters, it first enters the pressure reducing valve 2 through the gas conveying pipe 403, is reduced through the pressure reducing valve 2, then passes through the thermal gas mass flowmeter 3, and finally enters the capillary tube through the capillary joint 4, so as to complete the detection of the capillary flow.

[0053] Compared with the prior art, the thermal gas mass flowmeter is used for detection and collection of flow data, on the one hand, the thermal gas mass flowmeter is small in size, which is conducive to reducing the size of the entire detection device, facilitating the movement of the equipment, and improving the convenience of detection; on the other hand, the test data of the thermal gas mass flowmeter is not affected by the environmental temperature and pressure, and the consistency of the data can be better maintained, so as to improve the accuracy and reliability of data detection.

[0054] Secondly, the application mainly includes a thermal gas mass flowmeter, a pressure reducing valve and other components, which simplifies the structure of the whole device as much as possible, improves the reliability and stability of the equipment, and reduces the cost of the equipment.

[0055] The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A capillary flow detection device, characterized by, It comprises a gas source joint (1); A pressure reducing valve (2) whose inlet end is communicated with the gas source joint (1); A thermal gas mass flowmeter (3) which is communicated with the outlet end of the pressure reducing valve (2), and whose outlet end is also connected with a capillary joint (4); A controller (5) which is electrically connected with the thermal gas mass flowmeter (3).

2. The capillary flow test device of claim 1, wherein The detection device further comprises a housing (6) and a bottom plate (7) which are connected with each other; the gas source joint (1), the pressure reducing valve (2), the thermal gas mass flowmeter (3), the capillary joint (4) and the controller (5) are all arranged in the housing (6).

3. The capillary flow test device of claim 2, wherein The housing (6) is further provided with a cover plate (8) on the top, and a plurality of carrying handles (9) are hinged to the housing (6).

4. The capillary flow test device of claim 1, wherein The detection device further comprises a digital pressure gauge (10) which is connected with the pressure reducing valve (2) through a bypass pipe (11).

5. The capillary flow test device of claim 2, wherein The controller (5) comprises a flow display instrument (12) and a PCB control board which is electrically connected with the flow display instrument (12), and the thermal gas mass flowmeter (3) is electrically connected with the PCB control board.

6. The capillary flow test device of claim 2, wherein A one-way valve (13) is further arranged between the thermal gas mass flowmeter (3) and the capillary joint (4), which is opened to the exhaust end of the capillary joint (4) in the direction of gas flow.

7. The capillary flow test device of claim 6, wherein The capillary joint (4) comprises a fixed joint (401) and a movable joint (402) which are connected by threads, the fixed joint (401) is arranged on the housing (6), and the fixed joint (401) is connected with the one-way valve (13) through a gas conveying pipe (403); the fixed joint (401) is provided with a first air hole (404), and the movable joint (402) is provided with a second air hole (405), the first air hole (404) and the second air hole (405) are communicated with each other.

8. The capillary flow test device of claim 7, wherein Along the axis of the second air hole (405), a plug-in pipe (406) is arranged at the exhaust end of the second air hole (405), the inner wall of the plug-in pipe (406) is flush with the second air hole (405), and the outer wall of the plug-in pipe (406) and the movable joint (402) form a plug-in groove (407) which is matched with the capillary tube.

9. The capillary flow test device of claim 8, wherein, The exhaust end of the plug-in pipe (406) is further provided with a tapered guide surface (408).

10. The capillary flow test device of claim 5, wherein, The housing (6) is further provided with a cooling fan (14) and a power supply (15), and the cooling fan (14) and the power supply (15) are electrically connected with the PCB control board respectively.

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