Simple device for measuring flow of fan

Abstract

The utility model provides a simple device for measuring fan flow, which is characterized in that the lower part of a negative pressure meter is provided with a joint with external threads, a meter seat is made of a seamless galvanized steel pipe, the bottom of the meter seat is sealed, the inside of the meter seat is provided with internal threads matched with the external threads of the joint, and the meter seat is in threaded connection with the joint; a connecting pipe is arranged in the center of the bottom of the gauge stand, one end of the leather hose is detachably connected with the connecting pipe, the other end of the leather hose is connected to a leather hose of a fan to be measured, and data on the negative pressure gauge can be directly read during measurement. The device is small in size, light in weight, convenient to carry about, and very convenient to operate and use; and the device is simple in equipment, very convenient to disassemble and maintain and easy to daily maintain.

Description

Technical Field

[0001] The utility model relates to the field of fan flow measurement, in particular to a simple device for measuring fan flow. Background Art

[0002] According to the requirements of the coal mine safety inspection specification, the main ventilation fan system in normal use of coal mines, high-gas mines, outburst mines, and main ventilation fans with impeller diameters below 1.8m are inspected once a year, and other types of mines are inspected once every three years. The safety status of the main ventilation fan system plays a vital role in the normal operation of the mine ventilation system, and thus has a significant impact on the safe production of the mine.

[0003] In the safety inspection and testing of the fan system, it is necessary to focus on measuring the main fan air volume, negative pressure and other parameters. The air volume parameters are calculated through wind speed. At present, there are three methods to measure the main fan wind speed, including the cup method, differential pressure method, and static pressure difference method. The cup method directly measures the wind speed, but when measuring the running main fan, it is necessary to stop the operation or frequently guide the machine to arrange the cup position, which is not easy to operate and has a high risk factor; the differential pressure method and the static pressure difference method are calculated by measuring the total pressure and static pressure through the pitot tube installed on the fan, which is the easiest to implement and operate.

[0004] However, the differential pressure method often uses instruments such as U-shaped water column gauges, differential pressure gauges, and comprehensive parameter measuring instruments for fan detection. Since fan air volume measurement is mostly done in the field, U-shaped water column gauges are mostly made of glass or plastic, which are inconvenient to carry and easy to break and damage; the water column gauge pipeline is slender and difficult to add water; the scale on the water column gauge is easy to fall off, making field operations more difficult. In addition, differential pressure gauges and comprehensive parameter measuring instruments for fan detection are electronic products, which are prone to digital display or inaccuracy, especially in bad weather. Differential pressure gauges and comprehensive parameter measuring instruments for fan detection are expensive and require high maintenance costs. Utility Model Content

[0005] The utility model is based on the above technical problems and proposes a simple device for measuring the flow rate of a fan.

[0006] A simple device for measuring the flow rate of a fan comprises: a negative pressure gauge, a gauge seat, and a hose. The lower part of the negative pressure gauge is a joint with an external thread. The gauge seat is made of a seamless galvanized steel pipe. The bottom of the gauge seat is sealed and has an internal thread matching the external thread of the joint. The gauge seat is threadedly connected to the joint. A connecting pipe is provided at the center of the bottom of the gauge seat. One end of the leather hose is detachably connected to the connecting pipe, and the other end is connected to the pitot tube of the fan to be measured.

[0007] In a possible implementation, a fixing bolt is provided on the upper portion of the joint, and a sealing gasket is located between the front end of the table base and the fixing bolt.

[0008] In a possible implementation, a vertical pipe is provided at the inner center of the bottom of the table base, the vertical pipe is connected to the connecting pipe, a sealing plug is provided on the outer side of the vertical pipe, and the sealing plug is inserted from the lower end of the joint and seals the lower end of the joint.

[0009] In a possible implementation, the sealing plug is in the shape of a right circular cone, the riser passes through the sealing plug, and the inner diameter of the joint is smaller than the outer diameter of the lower portion of the sealing plug.

[0010] In a possible implementation, the sealing plug is made of rubber material.

[0011] Beneficial effects: The device is small in size and light in weight, and can be put into a leather case and carried around; it is also very convenient to operate and use: when measuring, the negative pressure gauge and the gauge seat can be screwed together through threads, and the two ends of the leather tube are respectively connected to the connecting pipe of the gauge seat and the fan pitot tube. The data on the negative pressure gauge is the measurement result. After the measurement, the gauge seat, negative pressure gauge and leather tube can be disassembled and stored; the device is simple in equipment, very convenient to disassemble and maintain, and easy for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The structure of the utility model is shown Figure 1 ;

[0013] Figure 2 The structure of the utility model is shown Figure 2 ;

[0014] Figure 3 The structure diagram of the table stand of the utility model is shown;

[0015] Figure 4 A cross-sectional view of the table base of the utility model is shown. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0017] like Figure 1 to Figure 4A simple device for measuring the flow rate of a fan is shown, the lower part of the negative pressure gauge 1 is a joint 2 with an external thread, the inside of the joint 2 is hollow, the airflow enters the negative pressure gauge 1 from the joint 2, the gauge seat 3 is made of a seamless galvanized steel pipe, the bottom of the gauge seat 3 is sealed, and the inside has an internal thread matching the external thread of the joint 2, the gauge seat 3 is threadedly connected to the joint 2, and a tightening fixing bolt is provided on the upper part of the outer part of the joint 2, a sealing gasket 4 is inserted into the lower side of the fixing bolt, and then the gauge seat 3 is tightened on the joint 2, and the sealing gasket 4 can play a certain sealing role.

[0018] A connecting tube 5 is provided at the bottom center of the meter stand 3, and one end of a leather tube 6 is detachably connected to the connecting tube 5. The leather tube 6 generally adopts a retractable rubber hose. A plurality of layered threaded rings are provided on the outside of the connecting tube 5. The threaded rings are stretched outward from the outside of the connecting tube 5. The leather tube 6 is sleeved on the connecting tube 5 to be more tightly tightened and airtight. The threaded rings are also convenient for using a hoop to tighten the leather tube 6; the other end is connected to the pitot tube of the fan to be tested, and the diameter of the leather tube 6 is selected according to the diameter of the pitot tube of the fan.

[0019] In order to make the seal between the meter seat 3 and the joint 2 better, a standpipe 7 is provided at the inner center of the bottom of the meter seat 3. The standpipe 7 is connected with the connecting pipe 5. A sealing plug 8 is provided on the outer side of the standpipe 7. The sealing plug 8 is inserted from the lower end of the joint 2 and seals the lower end of the joint 2. The sealing plug 8 adopts a right circular cone with an outer diameter gradually increasing from top to bottom. The standpipe 7 passes through the sealing plug 8, and the gas enters the joint 2 from the standpipe 7 through the leather tube 6 via the connecting pipe 5, and the inner diameter of the joint 2 is smaller than the outer diameter of the lower part of the sealing plug 8. As the meter seat 3 and the joint 2 are tightened, the standpipe 7 is inserted into the lower part of the joint 2, and the sealing plug 8 will seal the lower end of the joint 2. In order to ensure the sealing effect, the sealing plug 8 is made of rubber material with deformation recovery ability.

[0020] After use, the meter base 3 and the leather tube 6 can be disassembled and stored separately; and according to actual needs, negative pressure gauges 1 of different ranges, meter bases 3 matching the negative pressure gauges 1, and leather tubes 6 of different diameters can be selected for self-combination.

[0021] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A simple device for measuring fan flow, characterized in that: include: A negative pressure gauge, a gauge seat, and a hose. The lower part of the negative pressure gauge is a joint with an external thread. The gauge seat is made of a seamless galvanized steel pipe. The bottom of the gauge seat is sealed, and its interior has an internal thread that matches the external thread of the joint. The gauge seat is threadedly connected to the joint. A connecting pipe is provided at the center of the bottom of the gauge seat. One end of the leather hose is detachably connected to the connecting pipe, and the other end is connected to the Pitot tube of the fan to be tested.

2. The simple device for measuring fan flow according to claim 1, characterized in that: A fixing bolt is arranged on the upper part of the joint, and a sealing gasket is located between the front end of the table seat and the fixing bolt.

3. The simple device for measuring fan flow according to claim 1, characterized in that: A vertical pipe is provided at the inner center of the bottom of the meter seat, the vertical pipe is communicated with the connecting pipe, a sealing plug is provided on the outer side of the vertical pipe, the sealing plug is inserted from the lower end of the joint and seals the lower end of the joint.

4. The simple device for measuring fan flow rate according to claim 3, characterized in that: The sealing plug is in the shape of a right circular cone, the riser passes through the sealing plug, and the inner diameter of the joint is smaller than the outer diameter of the lower part of the sealing plug.

5. The simple device for measuring fan flow rate according to claim 4, characterized in that: The sealing plug is made of rubber material.

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