Fan inlet flow measuring device

Abstract

The utility model discloses a fan inlet flow measuring device which comprises a second measuring connector and a plurality of first measuring connectors fixedly installed on the outer edge of an air inlet of a fan body, the first measuring connectors and the second measuring connectors are T-shaped three-way connectors respectively, and each first measuring connector and the corresponding second measuring connector comprise a straight socket section and a T-shaped straight pipe section. The first measuring connectors are fixedly connected with a fixed installation platform used for being connected with a fan body, the second measuring connector and the two ends of the straight socket sections of the first measuring connectors are connected through hoses to form a closed annular pipeline, and the T-shaped straight pipe section of the second measuring connector is connected with a differential pressure measuring device. And the T-shaped straight pipe sections of the plurality of measuring joints I are communicated to the air inlet of the fan body. The differential pressure measuring device can be conveniently installed on a drum-shaped roller centrifugal fan body, air flow is evenly transmitted to the differential pressure measuring device, fan inlet flow measurement is achieved, the differential pressure measuring device is suitable for places where the installation space of a fan flow guide ring pressure tapping opening is insufficient, and the differential pressure measuring device is of an integrated structural design, low in manufacturing cost and easy and convenient to install and maintain.

Description

Technical Field

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

[0002] During the production and processing of existing fans, it is necessary to detect the fan inlet flow rate.

[0003] The known solution is to set a pressure tapping port at the throat of the guide ring inlet to extract the static pressure difference. The static pressure difference extracted by this method can directly calculate the volume flow. However, since the drum-type drum fan is generally small in size, and the guide ring and the box mounting bracket are an integrated structure, the throat of the guide ring inlet is short, and there is insufficient space for the pressure tapping port to be installed. Therefore, other methods are needed to determine the volume flow delivered. Utility Model Content

[0004] In order to solve the above technical problems, the utility model designs a device for measuring the inlet flow rate of a fan.

[0005] The utility model adopts the following technical solutions:

[0006] A device for measuring the inlet flow of a fan comprises a measuring joint 2 and a plurality of measuring joints 1 fixedly mounted on the outer edge of the air inlet of a fan body, wherein the measuring joint 1 and the measuring joint 2 are respectively T-type three-way joints, comprising a straight-line socket section and a T-shaped straight pipe section, and a fixed installation platform is fixedly connected to the measuring joint 1 for connecting the fan body, and both ends of the straight-line socket sections of the measuring joint 2 and the plurality of measuring joints 1 are respectively connected by hoses to form a closed annular pipeline, and the T-shaped straight pipe section of the measuring joint 2 is connected to a differential pressure measuring device, and the T-shaped straight pipe sections of the plurality of measuring joints 1 are connected to the air inlet of the fan body. The fan body is a drum-shaped centrifugal fan body, which is a product with mature performance and structure.

[0007] Preferably, the fixed installation platform is a T-shaped platform, and the T-shaped platform is provided with a bolt locking plane structure, and the T-shaped platform is fixedly installed on the fan body by bolt locking. It is locked with two M4 cross screws, and both sides are locked to prevent the plastic measurement interface from moving and rotating on the drum centrifugal fan body.

[0008] Preferably, the measuring joint 1 is a plastic T-type three-way joint, and both ends of the straight-line socket section of the measuring joint 1 are provided with undercut structures, each undercut length is between 4 and 6 mm, there are 3 sections, and the rounded angle is within 0.4-0.8 mm. The PVC transparent hose can be firmly fixed on the measuring joint 1 to prevent the hose from falling off due to airflow impact.

[0009] Preferably, the top end of the T-shaped straight pipe section of the measuring joint 1 is chamfered.

[0010] Preferably, the inner wall diameters of the straight socket section and the T-shaped straight pipe section are equal.

[0011] Preferably, the T-shaped platform fits tightly with the fan body without any gap.

[0012] Preferably, the second measuring joint is a standard all-copper T-shaped pagoda tee.

[0013] Preferably, the hose is a PVC transparent hose, including hoses of two lengths, and the long hose and the short hose are respectively connected to the two ends of the straight-line socket section of the four measuring joints 1 and the one measuring joint 2 to form a closed annular pipeline, so as to evenly transmit the airflow to the differential pressure measuring device.

[0014] The beneficial effects of the utility model are as follows: the utility model designs a fan inlet flow measurement device, which is easy to install on the drum-shaped centrifugal fan body, and evenly transmits the airflow to the differential pressure measuring device to realize the measurement of the fan inlet flow. It is suitable for places where there is insufficient installation space for the pressure tapping of the fan guide ring. It has an integrated structural design, low manufacturing cost, and easy installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the whole machine of the utility model;

[0016] Figure 2 It is a front view of the plastic measuring joint of the utility model;

[0017] Figure 3 It is a front view of the metal measuring joint of the utility model;

[0018] In the figure, 1. fan body, 2. plastic measuring joint, 3. metal measuring joint, 4. bolt, 5. PVC transparent hose, 6. differential pressure measuring device, 2.1. straight socket section, 2.2. T-shaped platform, 2.3. T-shaped straight pipe section, 5.1. long hose, 5.2. short hose. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0020] Example: Figure 1As shown, a device for measuring the inlet flow of a fan includes a fan body 1, a plastic measuring joint 2, a metal measuring joint 3, a bolt 4, a PVC transparent hose 5, and a differential pressure measuring device 6, wherein the plastic measuring joint includes a straight socket section 2.1, a T-shaped platform 2.2, and a T-shaped straight pipe section 2.3, and the plastic measuring joint is fixed to the drum-shaped centrifugal fan body through the T-shaped platform. The PVC transparent hose includes two length specifications, and the long hose 5.1 and the short hose 5.2 are respectively connected to 4 plastic measuring joints and 1 metal measuring joint to form a closed annular pipeline, which evenly transmits the airflow to the differential pressure measuring device. The drum-shaped centrifugal fan body is a product with mature performance and structure. The metal measuring interface is a standard all-copper T-shaped pagoda tee.

[0021] The volume flow rate can be calculated according to the formula .

[0022] Here, K is a coefficient that takes the gas flow characteristics into account, ΔP is the pressure difference between the inlet static pressure and the atmospheric pressure, and Q is the volume flow rate.

[0023] like Figure 2 The figure shows a front view of the plastic measuring joint of the utility model. The socket section position 2.1 includes but is not limited to undercuts and fillets, the undercut length L is between 4 and 6 mm, the fillet R is within 0.4-0.8 mm, the T-shaped platform 2.2 includes but is not limited to the bolt locking plane, and the chamfer at the top position of the T-shaped straight pipe section 2.3 includes but is not limited to fillets, and R is within 1.5-2.5 mm.

[0024] like Figure 3 The figure shows a front view of the metal measuring interface of the utility model, which is a standard all-copper T-shaped pagoda tee.

[0025] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A device for measuring the inlet flow of a fan, characterized in that: It includes a measuring joint 2 and multiple measuring joints 1 fixedly installed on the outer edge of the air inlet of the fan body. The measuring joint 1 and the measuring joint 2 are respectively T-type three-way joints, including a straight-line socket section and a T-shaped straight pipe section. A fixed installation platform is fixedly connected to the measuring joint 1 for connecting the fan body. Both ends of the straight-line socket sections of the measuring joint 2 and multiple measuring joints 1 are connected by hoses to form a closed ring pipeline. The T-shaped straight pipe section of the measuring joint 2 is connected to a differential pressure measuring device, and the T-shaped straight pipe sections of the multiple measuring joints 1 are connected to the air inlet of the fan body.

2. A device for measuring the fan inlet flow rate according to claim 1, characterized in that: The fixed installation platform is a T-shaped platform, and a bolt locking plane structure is arranged on the T-shaped platform. The T-shaped platform is fixedly installed on the fan body by bolt locking.

3. A device for measuring the fan inlet flow rate according to claim 1, characterized in that: The measuring joint 1 is a plastic T-type three-way joint. The two ends of the straight socket section of the measuring joint 1 are provided with undercut structures. The length of each undercut section is between 4 and 6 mm, there are 3 sections, and the rounded corners are within 0.4-0.8 mm.

4. A device for measuring the fan inlet flow rate according to claim 1, characterized in that: The top end of the T-shaped straight pipe section of the measuring joint 1 is chamfered.

5. The device for measuring the fan inlet flow rate according to claim 1, characterized in that: The inner wall diameters of the straight socket section and the T-shaped straight pipe section are equal.

6. A device for measuring the fan inlet flow rate according to claim 2, characterized in that: The T-shaped platform fits tightly with the fan body without any gap.

7. A device for measuring fan inlet flow rate according to claim 1, characterized in that: The second measuring joint is a standard all-copper T-shaped pagoda tee.

8. The device for measuring the fan inlet flow rate according to claim 1, characterized in that: The hose is a PVC transparent hose, including hoses of two length specifications. The long hose and the short hose are respectively connected to the two ends of the straight-line socket sections of four measuring joints one and one measuring joint two to form a closed ring pipeline.

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