Thermal type gas mass flow controller

Abstract

The invention relates to the technical field of gas monitoring, in particular to a thermal gas mass flow controller which comprises a mounting shell fixedly mounted in a pipeline. During detection, the mounting rod moves to drive the detector to move, so that the detector moves between the two sealing plates, the mounting rod continuously moves and drives the movable frame to move, the movable frame drives the sealing plates to be close to the pipeline, the two sealing plates are also gradually close to each other, and at the moment, the movable plate is blocked by the detector; the sealing plates and the detector are embedded and gradually inserted into the notches in the pipeline, the detector is flush with the inner wall of the pipeline, airflow in the pipeline cannot be affected, the detection result is more accurate, when detection work is not carried out, the detector retracts into the mounting shell, the movable frame independently moves to drive the two sealing plates to be close, and the detection efficiency is improved. At the moment, the movable plate seals the notch in the sealing plate under the action of the spring, gas leakage is avoided, the detector is protected, the detector is prevented from being exposed in gas of the pipeline for a long time, and the service life of the detector is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of gas monitoring, and more particularly to a thermal gas mass flow controller. Background Art

[0002] A thermal gas mass flow controller is an instrument for measuring gas flow, which measures gas flow using thermal principles. This type of controller is mainly applied to industrial applications that require precise control of gas mass, such as chemical processes, combustion systems, air conditioning systems, etc.

[0003] Chinese Patent Publication No. CN215374091U discloses a novel thermal gas mass flow controller.

[0004] In the prior art including the above patent, a thermal gas mass flow controller generally includes a heating element, a thermocouple, and a controller. When gas passes through, the heating element heats the gas, causing the thermocouple to measure an additional temperature change. This change is used to calculate the mass flow rate of the gas passing through. Thermal gas mass flow controllers generally have high accuracy and reliability and can operate within a wide range of temperatures and pressures. However, during actual use, a part of the thermal gas mass flow controller extends into the pipeline, which easily disturbs the gas flow in the pipeline, resulting in a large error in gas flow detection. Summary of the Invention

[0005] The object of the present invention is to provide a thermal gas mass flow controller to solve the above problems.

[0006] To achieve the above object, the present invention provides a thermal gas mass flow controller, including a mounting shell fixedly installed in a pipeline, and the following components are movably arranged in the mounting shell:

[0007] A mounting rod for supporting a detector;

[0008] Sealing plates symmetrically distributed in the mounting shell and provided with notches adapted to the detector, and movable plates for closing the notches on the sealing plates are slidably arranged on the sealing plates;

[0009] A movable frame for guiding the movement of the two sealing plates, where:

[0010] The mounting rod moves so that the detector is inserted between the two movable plates, and the movable frame moves so that the two sealing plates approach each other, and the sealing plates are engaged with the detector and inserted into the notches on the pipeline;

[0011] The movable frame moves alone so that the movable plates move relative to the sealing plates to close the notches on the sealing plates.

[0012] Preferably, a push rod extending to the outside of the movable frame is provided on the sealing plate, and a slope for pushing against the push rod is provided inside the mounting shell.

[0013] Preferably, a spring is provided between the push rod and the movable frame.

[0014] Preferably, a sealing strip is provided in the notch on the sealing plate, and a groove adapted to the sealing strip is formed on the side wall of the detector.

[0015] Preferably, a first turntable for driving the mounting rod to move and a second turntable for driving the sealing plate to move are respectively rotatably provided inside the mounting shell.

[0016] Preferably, transverse grooves are provided on both the mounting rod and the movable frame, and cylindrical tenon rods adapted to the transverse grooves are provided on both the first turntable and the second turntable.

[0017] Preferably, a cross bar for pushing the movable frame to move is provided on the mounting rod.

[0018] Preferably, a rack is slidably provided inside the mounting shell, and the rack is coupled with one of the first turntable and the second turntable to move the sealing plate.

[0019] Preferably, a guide groove for guiding the transverse movement of the rack is provided on the inner wall of the mounting shell, and the rack reciprocates along the guide groove to alternately couple with the first turntable and the second turntable.

[0020] Preferably, a sliding rod is slidably provided in the mounting shell, and the rack is slidably mounted on the sliding rod.

[0021] In the above technical solution, a thermal gas mass flow controller provided by the present invention has the following beneficial effects: When performing detection work, the mounting rod moves to drive the detector to move, so that the detector moves between the two sealing plates. The mounting rod continues to move and drives the movable frame to move. The movable frame drives the sealing plates to approach the pipeline, and the two sealing plates also gradually approach. At this time, the movable plate is blocked by the detector, and the sealing plates are fitted with the detector and gradually inserted into the notch on the pipeline. The detector is flush with the inner wall of the pipeline, which will not affect the air flow in the pipeline, and the detection result is more accurate. When not performing detection work, the detector retracts into the mounting shell, and the movable frame moves alone to drive the two sealing plates to approach. At this time, the movable plate seals the notch on the sealing plate under the action of the spring, avoiding gas leakage and protecting the detector from being exposed to the gas in the pipeline for a long time, thus extending the service life of the detector. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of the installation shell provided by an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the ejector rod provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the explosion structure provided by an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the tenon rod structure provided by an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the guide groove provided by an embodiment of the present invention.

[0029] Explanation of reference numerals:

[0030] 1. Installation shell; 11. Sealing plate; 111. Movable frame; 112. Ejector rod; 113. Sealing strip; 114. Movable plate; 115. Slope; 12. Detector; 121. Installation rod; 122. Cross bar; 123. Cross groove; 124. Vertical part; 125. Inclined groove; 131. First turntable; 132. Second turntable; 133. First gear; 134. Second gear; 135. Rack; 136. Slide bar; 137. Guide groove; 138. Movable piece; 139. Tenon rod; 2. Pipeline. Detailed implementation manners

[0031] To enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail in conjunction with the accompanying drawings.

[0032] As Figure 1-6 shown, a thermal gas mass flow controller includes an installation shell 1 fixedly installed in a pipeline 2, and the following are movably arranged in the installation shell 1:

[0033] An installation rod 121 for supporting the detector 12;

[0034] Sealing plates 11 symmetrically distributed in the installation shell 1 and provided with notches adapted to the detector 12, and a movable plate 114 for closing the notches thereon is slidably arranged on the sealing plates 11;

[0035] The movable frame 111 is used to guide the movement of two sealing plates 11, wherein:

[0036] The mounting rod 121 moves so that the detector 12 is inserted between the two movable plates 114, and the movable frame 111 moves so that the two sealing plates 11 approach each other, and the sealing plates 11 are engaged with the detector 12 and inserted into the notch on the pipeline 2;

[0037] The movable frame 111 moves alone so that the movable plate 114 moves relative to the sealing plate 11 to close the notch on the sealing plate 11.

[0038] Specifically, a spring is provided between the movable plate 114 and the sealing plate 11.

[0039] Further, the detector 12 in the above embodiment is specifically a thermal gas mass flow controller.

[0040] In the above technical solution, during the detection work, the mounting rod 121 moves to drive the detector 12 to move, so that the detector 12 moves between the two sealing plates 11. The mounting rod 121 continues to move and drives the movable frame 111 to move. The movable frame 111 drives the sealing plates 11 to approach the pipeline 2, and the two sealing plates 11 also gradually approach each other. At this time, the movable plate 114 is blocked by the detector 12. The sealing plates 11 are engaged with the detector 12 and gradually inserted into the notch on the pipeline 2. The detector 12 is flush with the inner wall of the pipeline 2 and will not affect the air flow in the pipeline 2, and the detection result is more accurate. When the detection work is not carried out, the detector 12 retracts into the mounting shell 1, and the movable frame 111 moves alone to drive the two sealing plates 11 to approach each other. At this time, the movable plate 114 seals the notch on the sealing plate 11 under the action of the spring, avoiding gas leakage and protecting the detector 12 from being exposed to the gas in the pipeline 2 for a long time, and prolonging the service life of the detector 12.

[0041] As a further embodiment provided by the present invention, a top rod 112 extending outside the movable frame 111 is provided on the sealing plate 11, a slope 115 for pushing against the top rod 112 is provided inside the mounting shell 1, and a spring is provided between the top rod 112 and the movable frame 111.

[0042] Specifically, during the process of the movable frame 111 approaching the pipeline 2, the top rod 112 is pushed by the slope 115 on the mounting shell 1 to drive the two sealing plates 11 to approach each other, thereby facilitating the movable frame 111 to send the sealing plates 11 to the notch on the pipeline 2. The spring between the top rod 112 and the movable frame 111 can facilitate the sealing plate 11 to make way for the movement of the detector 12.

[0043] As still another embodiment provided by the present invention, a sealing strip 113 is provided at the notch on the sealing plate 11, and a groove adapted to the sealing strip 113 is provided on the side wall of the detector 12.

[0044] Specifically, when the detector 12 is fitted with the sealing plate 11, the sealing strip 113 is inserted into the notch on the side wall of the detector 12, improving the tightness between the sealing plate 11 and the detector 12 and avoiding gas leakage.

[0045] As yet another embodiment further provided by the present invention, a first turntable 131 for driving the movement of the mounting rod 121 and a second turntable 132 for driving the movement of the sealing plate 11 are respectively rotatably arranged inside the mounting shell 1. Transverse grooves 123 are provided on both the mounting rod 121 and the movable frame 111. Cylindrical tenon rods 139 adapted to the transverse grooves 123 are provided on both the first turntable 131 and the second turntable 132. A cross bar 122 for pushing the movable frame 111 to move is provided on the mounting rod 121. A rack 135 is slidably arranged inside the mounting shell 1. The rack 135 is coupled with one of the first turntable 131 and the second turntable 132 to move the sealing plate 11. A guide groove 137 for guiding the transverse movement of the rack 135 is provided on the inner wall of the mounting shell 1. The rack 135 reciprocates along the guide groove 137 to alternately couple with the first turntable 131 and the second turntable 132. A slide rod 136 is slidably arranged in the mounting shell 1. The rack 135 is slidably mounted on the slide rod 136.

[0046] Specifically, a torsion spring is provided between the first turntable 131 and the mounting shell 1. A spring is provided between the movable frame 111 and the mounting shell 1. The guide groove 137 is in the shape of a parallelogram, which includes two vertical portions 124 and two inclined grooves 125 connecting the two vertical portions 124. A movable piece 138 is hinged inside the vertical portion 124. A torsion spring is provided between the movable piece 138 and the mounting shell 1. A convex block adapted to the guide groove 137 is provided on the rack 135. The slide rod 136 restricts the rack 135 to always maintain a vertical state. An electric telescopic rod is provided between the slide rod 136 and the mounting shell 1. A first gear 133 is provided on the first turntable 131. A second gear 134 is provided on the second turntable 132.

[0047] Further, when performing the detection work, the electric telescopic rod extends to push the sliding rod 136 to move. The sliding rod 136 drives the rack 135 to move along one of the vertical parts 124 of the guide groove 137. At this time, the rack 135 meshes with the first gear 133 on the first turntable 131. The rack 135 drives the first turntable 131 to rotate through the first gear 133. The tenon rod 139 on the first turntable 131 moves along the transverse groove 123 on the mounting rod 121 and pushes the mounting rod 121 to move. The mounting rod 121 drives the detector 12 to move between the two sealing plates 11. The mounting rod 121 continues to move and drives the movable frame 111 to move. The movable frame 111 drives the sealing plates 11 to approach the pipeline 2, and the two sealing plates 11 also gradually approach. At this time, the movable plate 114 is blocked by the detector 12. The sealing plates 11 are fitted with the detector 12 and gradually inserted into the notch on the pipeline 2. The detector 12 is flush with the inner wall of the pipeline 2 and does not affect the air flow in the pipeline 2. At this time, the first turntable 131 just rotates 180°. After the detection work is completed, the rack 135 continues to move and drives the first turntable 131 to continue rotating 180°. The detector 12 resets. The movable frame 111 resets under the action of the spring between it and the mounting shell 1. At this time, the convex block on the rack 135 moves and pushes the movable piece 138, so that the movable piece 138 gives way to the path for the convex block to move until the convex block moves to the connection of the vertical part 124 and the inclined groove 125. The movable piece 138 is separated from the convex block and seals the vertical part 124 under the action of the torsion spring. Then the rack 135 moves in the reverse direction. The rack 135 moves along the inclined groove 125 into the other vertical part 124, and the rack 135 moves horizontally. The rack 135 is separated from the first gear 133 and coupled with the second rack 135. The rack 135 drives the second turntable 132 to rotate through the second gear 134. The second turntable 132 pushes the movable frame 111 to approach the pipeline 2 alone. The two sealing plates 11 approach. At this time, the movable plate 114 seals the notch on the sealing plate 11 under the action of the spring, avoiding gas leakage and protecting the detector 12 from being exposed to the gas in the pipeline 2 for a long time, and extending the service life of the detector 12.

[0048] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A thermal gas mass flow controller, characterized in that Comprising a mounting shell (1) fixedly installed in a pipeline (2), and movably arranged in the mounting shell (1) are: A mounting rod (121) for supporting a detector (12); Sealing plates (11) symmetrically distributed in the mounting shell (1) and provided with notches adapted to the detector (12), and a movable plate (114) for closing the notches thereon is slidably arranged on the sealing plates (11); A movable frame (111) for guiding the movement of the two sealing plates (11), wherein: The mounting rod (121) moves so that the detector (12) is inserted between the two movable plates (114), and the movable frame (111) moves so that the two sealing plates (11) approach each other, and the sealing plates (11) are engaged with the detector (12) and inserted into the notches on the pipeline (2); The movable frame (111) moves alone so that the movable plate (114) moves relative to the sealing plate (11) to close the notches on the sealing plate (11).

2. The thermal gas mass flow controller according to claim 1, characterized in that, A top rod (112) extending to the outside of the movable frame (111) is arranged on the sealing plate (11), and a ramp (115) for pushing against the top rod (112) is arranged inside the mounting shell (1).

3. The thermal gas mass flow controller according to claim 2, wherein, A spring is arranged between the top rod (112) and the movable frame (111).

4. A thermal gas mass flow controller according to claim 1, characterized in that, Sealing strips (113) are arranged at the notches on the sealing plates (11), and grooves adapted to the sealing strips (113) are formed on the side walls of the detector (12).

5. A thermal gas mass flow controller according to claim 1, characterized in that, A first turntable (131) for driving the movement of the mounting rod (121) and a second turntable (132) for driving the movement of the sealing plate (11) are respectively rotatably arranged inside the mounting shell (1).

6. The thermal gas mass flow controller according to claim 5, wherein Horizontal grooves (123) are arranged on both the mounting rod (121) and the movable frame (111), and cylindrical tenon rods (139) adapted to the horizontal grooves (123) are arranged on both the first turntable (131) and the second turntable (132).

7. The thermal gas mass flow controller according to claim 1, characterized in that, A cross bar (122) for pushing against the movement of the movable frame (111) is arranged on the mounting rod (121).

8. The thermal gas mass flow controller according to claim 5, characterized in that, A rack (135) is slidably arranged inside the mounting shell (1), and the rack (135) is coupled with one of the first turntable (131) and the second turntable (132) to move the sealing plate (11).

9. A thermal gas mass flow controller according to claim 8, wherein, A guide groove (137) for guiding the lateral movement of the rack (135) is arranged on the inner wall of the mounting shell (1), and the rack (135) reciprocates along the guide groove (137) to alternately couple with the first turntable (131) and the second turntable (132).

10. A thermal gas mass flow controller according to claim 8, characterized in that, A slide rod (136) is slidably arranged in the mounting shell (1), and the rack (135) is slidably mounted on the slide rod (136).

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