Flow inner blockage detection method

Abstract

The invention discloses a flow inner blockage detection method. The flow inner blockage detection method comprises the following steps that firstly, a designed, shaped and manufactured heat exchanger is prepared; 2, the flow is set to be within a constant range in which fluid flows through the heat exchanger; thirdly, constant-pressure gas is introduced into an inlet of the heat exchanger; 4, detecting the flow flowing through the exchanger; 5, in the detection process, if blockage exists in the flow channel of the exchanger, the flowing resistance of the gas in the exchanger can be increased, and the flow becomes small; and 6, in the detection process, if no blockage exists, the flow is kept within a specific range. The method has the advantages that the constant range of the flow of the fluid flowing through the heat exchanger is set, the gas with the constant pressure is introduced into the inlet of the heat exchanger, the flow of the fluid flowing through the heat exchanger is detected, and the method is simple in detection mode, obvious in detection effect, low in cost and more suitable for detection of large-scale heat exchangers.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchanger detection, and specifically to a flow internal blockage detection method. Background Technique

[0002] The internal leakage defect of the heat exchanger is very concealed. The current detection scheme generally judges the internal leakage defect by detecting the change of the internal resistance and the flow rate of the heat exchanger;

[0003] For the invention with the application number 2,010,102,586,10.3 and the invention name of heat exchanger internal leakage detection device, among which, the helium mass spectrometer leak detector located on the frame is connected to the inlet IN of the workpiece through the first pipeline. There is a first solenoid valve on the first pipeline. The first outlet of the workpiece is connected to the helium gas source through a helium filling pipe. There is a second solenoid valve, a first pressure gauge and a first pressure reducing valve on the helium filling pipe. The second outlet of the workpiece is connected to the nitrogen gas source through a nitrogen filling pipe. There is a third solenoid valve, a second pressure gauge and a second pressure reducing valve on the nitrogen filling pipe. The programmable controller is connected to the helium mass spectrometer leak detector, the first, second and third solenoid valves and the display. The structure of this invention is relatively complex, the manufacturing cost is high, and it is not suitable for the detection of a large number of products. Summary of the Invention

[0004] The purpose of the present invention is to provide a flow internal blockage detection method to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A flow internal blockage detection method includes the following steps:

[0006] Step 1: Prepare the heat exchanger after design finalization and manufacturing;

[0007] Step 2: Set the flow rate within a constant range where a fluid flows through the heat exchanger;

[0008] Step 3: Introduce a gas with a constant pressure at the inlet of the heat exchanger;

[0009] Step 4: Detect the flow rate of the fluid flowing through the exchanger;

[0010] Step 5: During the detection, if there is a blockage in the flow channel of the exchanger, the resistance of the gas flowing in the exchanger will increase and the flow rate will decrease;

[0011] Step 6: During the detection, if there is no blockage, the flow rate will remain within a specific range.

[0012] 2. The flow internal blockage detection method according to claim 1, wherein: in step 1, a flow sensor is arranged at the inlet of the heat exchanger.

[0013] 3. The flow internal blockage detection method according to claim 1, characterized in that: in step two, the constant flow value range can be set between 85 and 95.

[0014] 4. The flow internal blockage detection method according to claim 1, characterized in that: in step one, multiple heat exchangers that have been designed, finalized, and manufactured can be detected simultaneously, and the overall production yield of the products can be detected by comparison.

[0015] 5. The flow internal blockage detection method according to claim 1, characterized in that: in step three, the inlet of the heat exchanger is connected to the gas pipeline with a constant pressure through a quick connector to achieve quick installation and disassembly.

[0016] Beneficial effects

[0017] The flow internal blockage detection method provided by the present invention sets a constant range for the flow rate of the fluid flowing through the heat exchanger, introduces a gas with a constant pressure at the inlet of the heat exchanger, and detects the flow rate of the fluid flowing through the exchanger. If there is a blockage in the flow channel of the exchanger, the resistance of the gas flowing in the exchanger will increase and the flow rate will decrease. If there is no blockage, the flow rate will remain within a certain specific range. This method has a simple detection method, obvious detection effect, low cost, and is more suitable for the detection of a large number of heat exchangers. Brief description of the drawings

[0018] Figure 1 It is a schematic diagram of a heat exchanger without internal blockage and a heat exchanger with internal blockage of the present invention;

[0019] Figure 2 It is a schematic diagram of the results of 10 measurements of the flow rate data of the present invention;

[0020] Figure 3 It is a histogram schematic diagram of the 10 measurement results of the present invention. Detailed implementation manners

[0021] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0022] Embodiment

[0023] As Figure 1-2 shown, a flow internal blockage detection method includes the following steps:

[0024] Step one: Prepare a heat exchanger that has been designed, finalized, and manufactured; [[ID=--]]

[0025] Step two: Set the flow rate within a constant range for the fluid flowing through the heat exchanger;

[0026] Step three: Introduce a gas with a constant pressure at the inlet of the heat exchanger;

[0027] Step Four: Detect the flow rate passing through the exchanger.

[0028] During the detection in Step Five, if there is a blockage in the flow channel of the exchanger, the resistance of the gas flowing in the exchanger will increase and the flow rate will decrease.

[0029] During the detection in Step Six, if there is no blockage, the flow rate will remain within a specific range.

[0030] In this embodiment, in Step One, the flow sensor is arranged at the inlet of the heat exchanger.

[0031] In Step Two, the range of the constant flow rate value can be set between 85 and 95.

[0032] In Step One, multiple heat exchangers that have been designed and manufactured can be detected simultaneously, and the overall production yield of the products can be detected by comparison.

[0033] In Step Three, the inlet of the heat exchanger is connected to the gas pipeline with a constant pressure through a quick connector to achieve quick installation and disassembly.

[0034] After the heat exchanger is designed and manufactured, the flow rate of the fluid passing through the heat exchanger should be within a constant range. A gas with a constant pressure is introduced at the inlet of the heat exchanger, and the flow rate passing through the exchanger is detected. If there is a blockage in the flow channel of the exchanger, the resistance of the gas flowing in the exchanger will increase and the flow rate will decrease. If there is no blockage, the flow rate will remain within a certain specific range.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow internal blockage detection method, characterized in that: It includes the following steps: Step 1: Prepare the heat exchanger after design finalization and manufacturing completion; Step 2: Set the flow rate within a constant range where a fluid flows through the heat exchanger; Step 3: Introduce a gas with a constant pressure at the inlet of the heat exchanger; Step 4: Detect the flow rate of the fluid flowing through the exchanger; Step 5: During the detection, if there is a blockage in the flow channel of the exchanger, the resistance of the gas flowing in the exchanger will increase and the flow rate will decrease; Step 6: During the detection, if there is no blockage, the flow rate will remain within a specific range.

2. The flow internal blockage detection method according to claim 1, characterized in that: In the said Step 1, a flow sensor is arranged at the inlet of the heat exchanger.

3. The flow internal blockage detection method according to claim 1, wherein: In the said Step 2, the constant flow rate value range can be set between 85 and 95.

4. The flow internal blockage detection method according to claim 1, wherein: In the said Step 1, multiple heat exchangers after design finalization and manufacturing completion can be detected simultaneously, and the overall production yield of the products can be detected by comparison.

5. The flow internal blockage detection method according to claim 1, characterized in that: In the said Step 3, the inlet of the heat exchanger is connected to the gas pipeline with the constant pressure through a quick connector to achieve quick installation and disassembly.

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