Thermal mass flowmeter capable of being installed under pressure

Abstract

The utility model discloses a thermal mass flow meter capable of being installed under pressure, which comprises a pipeline, a supporting cylinder fixedly welded at the upper end of the pipeline, a threaded sleeve connected inside the supporting cylinder through threads, a flow meter fixedly installed at the upper end of the threaded sleeve, a protective frame fixedly welded at the lower end of the threaded sleeve, and a sensor installed inside the threaded sleeve. According to the thermal mass flow meter capable of being installed under pressure, the flow meter is rotated to drive the threaded sleeve, the protective frame and the sensor to move upwards to be dismantled, the spring pushes the supporting plate to drive the sealing gasket to automatically block a through opening in the lower end of the supporting barrel, gas leakage during flow meter replacement can be prevented, and the design of the guide rod can guide the supporting plate and the sealing gasket to move; a protection frame is designed to protect the sensor, so that the sensor is prevented from being in contact with the sealing gasket and being extruded to be damaged; the rotating disc is rotated to drive the valve rod and the baffle to rotate, and gas flow is convenient to adjust.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent instruments and meters, in particular to a thermal mass flow meter which can be installed under pressure. Background Art

[0002] Thermal gas mass flow meter is an instrument that measures gas flow rate using the principle of heat diffusion. The sensor consists of two reference-grade thermal resistors. One is the velocity sensor RH, and the other is the temperature sensor RMG that measures the temperature change of the gas. Thermal gas mass flow meter has been widely used in many industries. Its principle is based on the principle of heat diffusion, that is, when the fluid flows through the heating object, the amount of heat dissipated by the heating object is in a certain proportional relationship with the flow rate of the fluid.

[0003] At present, the existing method is to first connect the two connecting cylinders with the external connecting pipe flange, and make the sleeve rotate at both ends of the flow meter body pipeline under the action of the external thread and the internal thread, so that the limit ring squeezes the fixing ring with the sealing ring, thereby locking the flow meter body and the two connecting cylinders, and seals the limit ring and the fixing ring through the sealing ring. Through the axial length of the external thread, the sleeve can supplement the length of the connecting cylinder and the two ends of the flow meter body pipeline to adapt, without too much consideration of the distance between the external connecting pipe and the size of the flow meter body, and the installation is relatively simple. The setting of the filter can play the effect of impurity filtering. Through the setting of the cylinder one, the guide rod and the cylinder two, the flow meter body can be supported and limited.

[0004] For example, a new type of thermal gas mass flowmeter disclosed in the authorization number CN217877843U includes a flowmeter body, connecting cylinders are provided on both sides of the flowmeter body pipeline, and the two connecting cylinders are symmetrical, and sleeves are provided on one end of the two connecting cylinders close to the flowmeter body, and external threads are provided at both ends of the flowmeter body pipeline, and each sleeve is provided with an internal thread matched with the external thread on the inner wall close to the flowmeter body, and both ends of the flowmeter body pipeline are threadedly connected with the two sleeves through external threads and internal threads respectively, and each sleeve is provided with a sliding groove on the inner wall away from the flowmeter body. A fixing ring is welded on the outer surface of each connecting cylinder close to one end of the flowmeter body, and the two fixing rings correspond to the two sliding grooves one by one, and the fixing ring is slidably connected to the sliding groove, and one end of each sleeve away from the flowmeter body is fixedly connected to a limiting ring by a screw, and one end of the two fixing rings away from the flowmeter body is provided with a sealing ring, and the side of the sealing ring away from the fixing ring is in contact with the limiting ring. However, such a new type of thermal gas mass flowmeter is prone to gas leakage when the flowmeter is replaced, and it is inconvenient to replace and adjust the gas flow.

[0005] It can be seen from the solutions disclosed in the above-mentioned existing patent documents that replacing the flow meter is likely to cause gas leakage, which is inconvenient to replace and adjust the gas flow. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The utility model aims to provide a thermal mass flowmeter which can be installed under pressure, so as to solve the problems that gas leakage is easily caused when the flowmeter is replaced, replacement is inconvenient, and the gas flow is inconvenient to adjust.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thermal mass flowmeter that can be installed under pressure, comprising a pipeline, a support tube fixedly welded to the upper end of the pipeline, a threaded sleeve connected to the inside of the support tube by a thread, a flowmeter fixedly installed on the upper end of the threaded sleeve, a protective frame fixedly welded to the lower end of the threaded sleeve, a sensor installed inside the threaded sleeve, a guide rod fixedly welded to the inner wall of the pipeline, a spring slidingly sleeved on the outer side of the guide rod, a connecting sleeve connected to the outer side of the pipeline by a thread, a valve seat fixedly welded to the inside of the connecting sleeve, a valve stem slidingly sleeved on the inside of the valve seat, and a rotating disk fixedly welded to one end of the valve stem.

[0008] Preferably, the upper end of the spring is fixedly connected to a support plate, and the lower end of the spring is fixedly connected to a pipeline. By rotating the flow meter, the threaded sleeve, the protective frame and the sensor are moved upward for removal. The spring pushes the support plate to drive the sealing gasket to automatically block the lower end opening of the support tube, thereby preventing gas leakage when replacing the flow meter.

[0009] Preferably, the upper end of the support tube is in close contact with the flow meter, and the lower end of the protection frame is in close contact with a sealing gasket. The guide rod is designed to guide the movement of the support plate and the sealing gasket to prevent the sealing gasket from deviating to the side and blocking the support tube after the threaded sleeve is removed.

[0010] Preferably, the sensor is sleeved inside the protective frame, a support plate is slidably sleeved on the outside of the guide rod, a sealing gasket is fixed and adhered to the upper end of the support plate, and the design of the protective frame can protect the sensor to prevent the sensor from contacting the sealing gasket and being squeezed and damaged.

[0011] Preferably, one end of the valve stem is slidably connected to a bearing, a baffle is fixedly welded to the outside of the valve stem, a bearing is fixedly installed inside the connecting sleeve, and a baffle is sleeved inside the connecting sleeve. The valve stem and the baffle are driven to rotate by rotating the rotating disk, thereby facilitating the adjustment of the gas flow.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The upper end of the spring of the utility model is fixedly connected to a support plate, and the lower end of the spring is fixedly connected to a pipeline. By rotating the flow meter, the threaded sleeve, the protective frame and the sensor are moved upward for removal. The spring pushes the support plate to drive the sealing gasket to automatically block the lower end opening of the support tube, which can prevent gas leakage when replacing the flow meter.

[0014] 2. The upper end of the support tube of the utility model is in close contact with the flow meter, and the lower end of the protection frame is in close contact with the sealing gasket. The design of the guide rod can guide the movement of the support plate and the sealing gasket to prevent the sealing gasket from lateral deviation and blocking the support tube after the threaded sleeve is removed.

[0015] 3. The sensor is sleeved inside the protective frame of the utility model, and a support plate is slidably sleeved on the outside of the guide rod. A sealing gasket is fixed and adhered to the upper end of the support plate. The design of the protective frame can protect the sensor and prevent the sensor from being damaged by being squeezed when contacting the sealing gasket.

[0016] 4. One end of the valve stem of the utility model is slidably connected with a bearing, a baffle is fixedly welded on the outside of the valve stem, a bearing is fixedly installed inside the connecting sleeve, and a baffle is sleeved inside the connecting sleeve. The valve stem and the baffle are driven to rotate by rotating the rotating disk, so as to facilitate the adjustment of gas flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is an enlarged top view of the support plate of the utility model;

[0019] Figure 3 It is an enlarged sectional view of the connecting sleeve of the utility model from the left.

[0020] In the figure: 1 pipeline, 11 support cylinder, 12 threaded sleeve, 13 flow meter, 14 protection frame, 15 sensor, 16 guide rod, 17 spring, 18 support plate, 19 sealing gasket, 2 connecting sleeve, 21 valve seat, 22 valve stem, 23 rotating disk, 24 bearing, 25 baffle. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example 1

[0023] See also Figure 1-3A thermal mass flowmeter that can be installed under pressure is shown in the figure, comprising a pipeline 1, a support tube 11 is fixedly welded to the upper end of the pipeline 1, a threaded sleeve 12 is threadedly connected to the inside of the support tube 11, a flowmeter 13 is fixedly installed on the upper end of the threaded sleeve 12, a protective frame 14 is fixedly welded to the lower end of the threaded sleeve 12, a sensor 15 is installed inside the threaded sleeve 12, a guide rod 16 is fixedly welded to the inner wall of the pipeline 1, a spring 17 is slidably sleeved on the outer side of the guide rod 16, a connecting sleeve 2 is threadedly connected to the outer side of the pipeline 1, a valve seat 21 is fixedly welded to the inside of the connecting sleeve 2, a valve stem 22 is slidably sleeved on the inside of the valve seat 21, and a rotating disk 23 is fixedly welded to one end of the valve stem 22.

[0024] In order to prevent gas leakage when replacing the flow meter 13, the upper end of the spring 17 is fixedly connected to the support plate 18, and the lower end of the spring 17 is fixedly connected to the pipeline 1. By rotating the flow meter 13, the threaded sleeve 12, the protective frame 14 and the sensor 15 are moved upward for removal. The spring 17 pushes the support plate 18 to drive the sealing gasket 19 to automatically block the lower end of the support tube 11, which can prevent gas leakage when replacing the flow meter 13. The upper end of the support tube 11 is close to the flow meter 13, and the lower end of the protective frame 14 is close to the sealing gasket 19. The design of the guide rod 16 can guide the movement of the support plate 18 and the sealing gasket 19 to prevent the sealing gasket 19 from tilting to the side and blocking the support tube 11 after the threaded sleeve 12 is removed.

[0025] In this embodiment, the threaded sleeve 12, the protective frame 14 and the sensor 15 are moved upward and removed by rotating the flow meter 13. The spring 17 pushes the support plate 18 to drive the sealing gasket 19 to automatically block the lower end opening of the support tube 11, thereby preventing gas leakage when replacing the flow meter 13. The design of the guide rod 16 can guide the movement of the support plate 18 and the sealing gasket 19 to prevent the sealing gasket 19 from tilting to the side and blocking the support tube 11 after the threaded sleeve 12 is removed.

[0026] Example 2

[0027] See also Figure 1-3 The present embodiment further explains Example 1. In the figure, a thermal mass flowmeter that can be installed under pressure includes a pipeline 1. A support tube 11 is fixedly welded to the upper end of the pipeline 1. A threaded sleeve 12 is connected to the inside of the support tube 11 through a thread. A flowmeter 13 is fixedly installed on the upper end of the threaded sleeve 12. A protective frame 14 is fixedly welded to the lower end of the threaded sleeve 12. A sensor 15 is installed inside the threaded sleeve 12. A guide rod 16 is fixedly welded to the inner wall of the pipeline 1. A spring 17 is slidably sleeved on the outer side of the guide rod 16. A connecting sleeve 2 is threadedly connected to the outer side of the pipeline 1. A valve seat 21 is fixedly welded to the inside of the connecting sleeve 2. A valve stem 22 is slidably sleeved on the inside of the valve seat 21. A rotating disk 23 is fixedly welded to one end of the valve stem 22.

[0028] In order to facilitate the adjustment of gas flow, the sensor 15 is sleeved inside the protective frame 14, and the support plate 18 is slidably sleeved on the outer side of the guide rod 16. A sealing gasket 19 is fixedly adhered to the upper end of the support plate 18. The design of the protective frame 14 can protect the sensor 15 to prevent the sensor 15 from contacting the sealing gasket 19 and being squeezed and damaged. A bearing 24 is slidably connected to one end of the valve stem 22, and a baffle 25 is fixedly welded on the outer side of the valve stem 22. The bearing 24 is fixedly installed inside the connecting sleeve 2, and the baffle 25 is sleeved inside the connecting sleeve 2. The valve stem 22 and the baffle 25 are driven to rotate by rotating the rotating disk 23, so as to facilitate the adjustment of gas flow.

[0029] In this embodiment, the protection frame 14 is designed to protect the sensor 15, preventing the sensor 15 from being squeezed and damaged by contacting the sealing gasket 19, and driving the valve stem 22 and the baffle 25 to rotate by rotating the rotating disk 23, thereby facilitating the adjustment of the gas flow.

[0030] The thermal mass flowmeter that can be installed under pressure drives the threaded sleeve 12, the protective frame 14 and the sensor 15 to move upward and be removed by rotating the flowmeter 13. The spring 17 pushes the support plate 18 to drive the sealing gasket 19 to automatically block the lower end opening of the support tube 11, so as to prevent gas leakage when replacing the flowmeter 13. The design of the guide rod 16 can guide the movement of the support plate 18 and the sealing gasket 19 to prevent the sealing gasket 19 from lateral deviation and blocking the support tube 11 after the threaded sleeve 12 is removed. The design of the protective frame 14 can protect the sensor 15 to prevent the sensor 15 from contacting the sealing gasket 19 and being squeezed and damaged; the valve stem 22 and the baffle 25 are driven to rotate by rotating the rotating disk 23, so as to facilitate the adjustment of the gas flow.

[0031] 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 thermal mass flowmeter that can be installed under pressure, comprising a pipeline (1), characterized in that: A support tube (11) is fixedly welded to the upper end of the pipeline (1), a threaded sleeve (12) is connected to the interior of the support tube (11) via a thread, a flow meter (13) is fixedly installed on the upper end of the threaded sleeve (12), a protective frame (14) is fixedly welded to the lower end of the threaded sleeve (12), a sensor (15) is installed inside the threaded sleeve (12), a guide rod (16) is fixedly welded to the inner wall of the pipeline (1), a spring (17) is slidably sleeved on the outer side of the guide rod (16), a connecting sleeve (2) is connected to the outer side of the pipeline (1) via a thread, a valve seat (21) is fixedly welded to the interior of the connecting sleeve (2), a valve stem (22) is slidably sleeved on the interior of the valve seat (21), and a rotating disk (23) is fixedly welded to one end of the valve stem (22).

2. A thermal mass flowmeter that can be installed under pressure according to claim 1, characterized in that: The upper end of the spring (17) is fixedly connected to a support plate (18), and the lower end of the spring (17) is fixedly connected to a pipeline (1).

3. A thermal mass flowmeter that can be installed under pressure according to claim 1, characterized in that: The upper end of the support tube (11) is in close contact with the flow meter (13), and the lower end of the protection frame (14) is in close contact with a sealing gasket (19).

4. A thermal mass flowmeter that can be installed under pressure according to claim 1, characterized in that: The sensor (15) is sleeved inside the protection frame (14), and a support plate (18) is slidably sleeved on the outside of the guide rod (16), and a sealing pad (19) is fixedly bonded inside the upper end of the support plate (18).

5. The thermal mass flowmeter that can be installed under pressure according to claim 1 is characterized in that: One end of the valve stem (22) is slidably connected to a bearing (24), a baffle (25) is fixedly welded to the outer side of the valve stem (22), a bearing (24) is fixedly installed inside the connecting sleeve (2), and a baffle (25) is sleeved inside the connecting sleeve (2).

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