Laminar flow part structure press-fitting online testing device and method

Abstract

The invention relates to the field of laminar flow part structure production and testing, in particular to a laminar flow part structure press fitting online testing device and method.The laminar flow part structure comprises an outer layer part and an inner plug part, the inner plug part is inserted into the outer layer part, and a laminar flow channel has different flow resistance at different insertion depths; the device comprises an outer-layer part restraining tool, a pressing block sliding fit tool, a pressing block and a thermal flow sensor. The outer-layer part restraining tool is provided with a restraining cavity used for restraining an outer-layer part. The pressing block sliding fit tool is provided with a pressing block containing cavity and a fluid inlet. The pressing block is provided with a sliding part and a non-contact part, the sliding part is installed in the pressing block containing cavity in a sealed and sliding mode, the non-contact part and the inner circumferential wall of the pressing block containing cavity jointly form a fluid cavity communicated with the fluid inlet, and the fluid cavity is communicated with the laminar flow channel. And the outer-layer part constraint tool is provided with a sensor inflow channel which is communicated with an inlet of the laminar flow channel and an inflow port of the thermal flow sensor. According to the invention, on-line testing can be carried out while the laminar flow part structure is pressed, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to the field of laminar flow component production and testing, and in particular to a laminar flow component structure press-fit online testing device and method. Background Art

[0002] The laminar flow structure (flow resistance structure) and the sensor together form a flow meter. In the production process of existing flow meters, assembly is performed first and then testing and screening is performed. Before the laminar flow components are assembled, it is impossible to confirm whether the laminar flow components are good or bad. This process has great uncertainty. After assembly, testing is performed to see if they are qualified. If they are not qualified, they cannot be adjusted further and can only be scrapped, which is a huge waste.

[0003] Therefore, there is an urgent need to design a device for preparing a laminar flow structure that can be pressed and tested until the requirements are met. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an online testing device and method for pressing and assembling a laminar flow component structure, which can perform online testing while pressing and assembling the laminar flow component structure until the pressing and assembling meets the requirements, thereby improving product quality and production efficiency.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a laminar flow component structure press-fit online testing device, the laminar flow component structure includes an outer layer component and an inner plug component, the inner plug component is inserted into the outer layer component, and a laminar flow channel is formed between the outer layer component and the inner plug component by a protrusion arranged on one of the outer layer component and the inner plug component and an interference fit with the other; the outer layer component has an inner diameter tapered section, and the inner plug component has an outer diameter tapered section that axially overlaps with the inner diameter tapered section, so that the inner plug component has different flow resistances at different insertion depths; the press-fit online testing device includes: The outer layer member restraining tool has a restraining cavity for restraining the outer layer member, and both ends of the restraining cavity are open; A pressing block sliding fitting, used for sealingly contacting with the end of the outer layer member restraining fitting facing the inlet side of the laminar flow channel; having a pressing block accommodating cavity and a fluid inlet; A pressing block, used for pressing the inner plug into the outer layer along the pressing direction, having a sliding portion and a non-contact portion sequentially arranged along the pressing direction, the sliding portion sealingly and slidingly installed in the pressing block accommodating cavity, the non-contact portion and the inner peripheral wall of the pressing block accommodating cavity jointly forming a fluid cavity connected to the fluid inlet, and the fluid cavity is used to connect to the laminar flow channel; The thermal flow sensor, the pressure block sliding fixture is provided with a sensor inlet channel connected to the fluid cavity or the outer layer constraint fixture is provided with a sensor inlet channel connected to the entrance of the laminar flow channel, and the inlet of the thermal flow sensor is connected to the sensor inlet channel.

[0006] In order to prevent the pressing block from being separated from the pressing block sliding tooling, the laminar flow component structure pressing and assembly online testing device further comprises a locking block, the locking block is located outside the pressing block sliding tooling and is connected to the end of the pressing block away from the inner plug; The end of the pressure block sliding fixture away from the outer layer part restraining fixture is provided with a through hole for the locking block or the pressure block to pass through, and the through hole is configured to not allow the locking block to enter the pressure block sliding fixture from it, and not allow the pressure block to detach from the pressure block sliding fixture from it.

[0007] In order to further avoid unnecessary interference and ensure the consistency of the test process, the thermal flow sensor is installed on the outer layer member constraint fixture, and the sensor inlet channel is arranged on the outer layer member constraint fixture.

[0008] In order to make the test process as consistent as possible with the actual use situation, a sensor communication port is provided in the circumference of the end of the outer layer near the pressing block; wherein, An annular groove is provided on the outer peripheral wall of the outer layer member near the end of the pressing block. The annular groove and the inner peripheral wall of the constraint cavity together form an annular cavity. The sensor communication port is connected to the sensor inlet channel through the annular cavity.

[0009] In order to further prevent the leakage of fluid entering the annular cavity and affect the accuracy of detection, a first sealing ring is provided between the constraint cavity and the outer layer, and the first sealing ring is located at the rear of the annular cavity along the fluid flow direction.

[0010] In order to make the test process as consistent as possible with actual usage, the outer layer constraint tooling is also provided with a fluid outlet and a sensor outlet channel, the fluid outlet is used to connect to the laminar flow channel outlet, and the sensor outlet channel connects the outlet of the thermal flow sensor and the fluid outlet.

[0011] In order to further prevent the fluid in the fluid cavity from leaking from the matching position between the sliding part and the pressure block accommodating cavity, a second sealing ring is arranged between the sliding part and the pressure block accommodating cavity.

[0012] In order to further prevent fluid leakage from the joint of the two fixtures, a third sealing ring is provided between the pressing block sliding fixture and the outer layer member restraining fixture.

[0013] The present invention also relates to a method for an online testing device for press-fitting a laminar flow component structure, the method comprising: Step S1, the outer layer member is placed in the restraining cavity and the inner plug member is inserted into the outer layer member; Step S2, making the pressing block slide and fit the tooling to seal and contact the confinement cavity toward the inlet end of the laminar flow channel; Step S3, outputting the target flow rate to the fluid inlet of the pressing block sliding fitting, during which the pressing block presses the inner plug and deforms the protrusion, and the thermal flow sensor measures the flow rate; Step S4, when the flow value measured by the thermal flow sensor reaches a preset flow value, the pressing block stops pressing.

[0014] After adopting the above technical solution, the present invention has the following beneficial effects: The present invention successfully transforms the method of assembling first and then testing and selecting good products into a method of real-time online press-fit testing, press-fits the laminar flow component structure until the test results meet the requirements, and improves the flow resistance accuracy and consistency of the laminar flow component structure; The present invention monitors the originally uncertain assembly process, effectively improves the process control capability, reduces the process defect rate and also reduces the difficulty of subsequent wafer debugging; 1. The present invention can compensate for individual differences caused by machined parts errors due to the adjusted target value, further improving the consistency of the laminar parts structure; 2. The device of the present invention can be tested online while being pressed, which also improves the production efficiency of the laminar flow structure; 3. The present invention can also adjust the size of the fluid flow rate flowing into the device and the position end point of the press-fitting, so as to realize the assembly of laminar flow component structures with various flow resistance specifications through outer layer components and inner plug components of fixed specifications, thereby making the production method more flexible, greatly reducing the difficulty of production and material preparation, and improving material utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an online testing device for press-fitting a laminar flow component structure of the present invention; Figure 2 It is a schematic diagram of a laminar flow component structure press-fitting test of the laminar flow component structure by the on-line test device for press-fitting the laminar flow component structure of the present invention; Figure 3 It is a structural schematic diagram of the laminar flow structure of the present invention; In the figure, 10, outer layer member; 101, inner diameter tapered section; 102, sensor communication port; 103, annular groove; 20, inner plug member; 201, outer diameter tapered section; 30, laminar flow channel; 1. Outer layer restraint tooling; 11. Restraint cavity; 12. Sensor inlet channel; 13. Fluid outlet; 14. Sensor outlet channel; 2. Pressure block sliding tooling; 21. Pressure block accommodating cavity; 22. Fluid inlet; 3. Pressure block; 31. Sliding portion; 32. Non-contact portion; 4. Fluid cavity; 5. Thermal flow sensor; 6. Locking block; 7. Annular cavity; 81. First sealing ring; 82. Second sealing ring; 83. Third sealing ring. DETAILED DESCRIPTION

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0017] like Figure 1 , Figure 2 and Figure 3 As shown, a laminar flow component structure press-fit online testing device, the laminar flow component structure comprises an outer layer component 10 and an inner plug component 20, the inner plug component 20 is inserted into the outer layer component 10, and a laminar flow channel 30 is formed between the outer layer component 10 and the inner plug component 20 by means of a protrusion provided on one of the outer layer component 10 and the inner plug component 20 having an interference fit with the other; the outer layer component 10 has an inner diameter tapered section 101, and the inner plug component 20 has an outer diameter tapered section 201 that is axially overlapped with the inner diameter tapered section 101, so that the inner plug component 20 has different flow resistances at different insertion depths; the press-fit online testing device comprises: The outer layer member restraining tool 1 has a restraining cavity 11 for restraining the outer layer member 10, and both ends of the restraining cavity 11 are open; The pressing block sliding fitting 2 is used for sealing contact with the end of the outer layer member restraining fitting 1 facing the inlet side of the laminar flow channel 30; it has a pressing block accommodating cavity 21 and a fluid inlet 22; The pressing block 3 is used to press the inner plug 20 into the outer layer 10 along the pressing direction, and has a sliding portion 31 and a non-contact portion 32 arranged in sequence along the pressing direction. The sliding portion 31 is sealed and slidably installed in the pressing block accommodating cavity 21. The non-contact portion 32 and the inner peripheral wall of the pressing block accommodating cavity 21 jointly form a fluid cavity 4 connected to the fluid inlet 22. The fluid cavity 4 is used to connect the laminar flow channel 30; The thermal flow sensor 5 , the pressure block sliding fixture 2 is provided with a sensor inlet channel 12 connected to the fluid cavity 4 or the outer layer constraint fixture 1 is provided with a sensor inlet channel 12 connected to the entrance of the laminar flow channel 30 , and the inlet of the thermal flow sensor 5 is connected to the sensor inlet channel 12 .

[0018] Specifically, since the outer layer member 10 has an inner diameter tapered section 101 and the inner plug member 20 has an outer diameter tapered section 201, after the inner plug member 20 is inserted into the outer layer member 10, the laminar flow channel 30 has different flow resistances at different insertion depths. Therefore, the laminar flow channel 30 can be press-fitted and tested at the same time until the flow resistance meets the requirements. The press-fitting online testing process is as follows: In the first step, the outer layer 10 is placed in the restraining cavity 11 and the inner plug 20 is inserted into the outer layer 10; The second step is to make the pressing block sliding fitting 2 seal and contact the inlet end of the constraint cavity 11 toward the laminar flow channel 30; The third step is to connect the fluid inlet of the pressing block sliding fixture 2 to the air outlet of a flow controller, and the flow controller outputs a target flow rate to the fluid inlet 22 of the pressing block sliding fixture 2. During this process, the pressing block 3 moves along the axial direction until it contacts the inner plug 20. After further movement, the protrusion will change phase, and the flow resistance of the laminar flow structure will change, which will eventually cause the flow signal measured by the thermal flow sensor 5 or the flow calculated for the entire device to change accordingly. In the fourth step, the pressing block 3 stops pressing when the flow signal measured by the thermal flow sensor 5 or the flow calculated for the entire device reaches a preset value.

[0019] During the entire press-fit online test process, preferably, the structure formed by the thermal flow sensor 5 and the press-fitted laminar flow component structure is regarded as a flow meter. When the flow value measured by the thermal flow sensor 5 is consistent with the target flow output by the flow controller, the press-fitting is stopped.

[0020] Through the above process, it can be known that the present embodiment successfully converts the method of assembling first and then testing and screening good products into a real-time online press-fit test method, and presses the laminar part structure until the test result meets the requirements, thereby improving the flow resistance accuracy and consistency of the laminar part structure, and also improving production efficiency; due to the adjusted target value, individual differences caused by machined parts errors can be compensated, and the consistency of the laminar part structure is further improved; and by changing the flow rate of the inflow device, the position end point of the press-fit can be adjusted, making the production method more flexible.

[0021] It should be noted that the thermal flow sensor 5 is a measuring device that uses the change in the voltage of the thermistor wire caused by gas flow. The typical structure is as follows: Figure 1 and Figure 2As shown, it includes a hollow metal tube and a thermistor wire wound on the tube wall. The fluid flows through the hollow metal tube. Due to the limited heating capacity of the thermistor wire, the flow rate allowed to pass through the entire sensor is limited. The laminar flow component structure exists to adjust the flow rate through the thermal flow sensor 5. When the flow rate that the finished product needs to pass is very large, more gas needs to flow through the laminar flow component structure to maintain the maximum flow rate of the thermal sensor not exceeding its range. When assembling flow meters of different ranges, the range switching can be achieved by replacing the laminar flow component structure. The consistency of the laminar flow component structure will directly affect the accuracy difference of the finished flow meter.

[0022] exist Figure 2 and Figure 3 In the laminar flow component structure shown, the outer layer component 10 has an inner diameter tapered section 101, and the inner plug component 20 has an outer diameter tapered section 201. The inner diameter tapered section 101 and the outer diameter tapered section 201 overlap in the axial direction, and preferably have the same reduction rate. In this way, it can be ensured that the gap formed by the inner diameter tapered section 101 and the outer diameter tapered section 201 changes in size with the insertion depth of the inner plug component 20, but is always of equal thickness in the axial direction, thereby ensuring the laminar flow effect.

[0023] In one embodiment, Figure 1 and Figure 2 As shown, the laminar flow component structure press-fit online testing device further includes a locking block 6, which is located outside the pressing block sliding fitting 2 and connected to the end of the pressing block 3 away from the inner plug 20; The end of the pressure block sliding fixture 2 away from the outer layer part constraint fixture 1 is provided with a through hole for the locking block 6 or the pressure block 3 to pass through. The through hole is configured to prevent the locking block 6 from entering the pressure block sliding fixture 2 and prevent the pressure block 3 from detaching from the pressure block sliding fixture 2.

[0024] Specifically, the locking block 6 can be locked with the pressing block 3 by means of threads or the like to form a whole, and move synchronously along the axis with the pressing block 3. Before installing the locking block 6, the pressing block 3 is conveniently inserted into the pressing block accommodating cavity 21 from the end of the pressing block sliding fitting 2 close to the outer layer member restraining fitting 1, and then the locking block 6 is connected to the pressing block 3. In this way, the installation of the pressing block 3 is convenient, and the pressing block 3 can be effectively prevented from being separated from the pressing block accommodating cavity 21.

[0025] In one embodiment, Figure 1 and Figure 2 As shown, the thermal flow sensor 5 is installed on the outer layer member restraining fixture 1 , and the sensor inlet channel 12 is arranged on the outer layer member restraining fixture 1 .

[0026] Specifically, fixing the thermal flow sensor 5 and the outer layer restraint tooling 1 together can improve the integration and avoid changes in the flow resistance of the flow path of the thermal flow sensor 5 due to position changes of the thermal flow sensor 5, thereby ensuring the consistency of the flow resistance of each laminar component structure.

[0027] In one embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a sensor communication port 102 is provided in the circumferential direction of the end of the outer layer 10 close to the pressure block 3; wherein, An annular groove 103 is provided on the outer peripheral wall of the end of the outer layer 10 close to the pressing block 3 . The annular groove 103 and the inner peripheral wall of the constraint cavity 11 together form an annular cavity 7 . The sensor communication port 102 is connected to the sensor inlet channel 12 through the annular cavity 7 .

[0028] In this way, the online measurement process can be ensured to be consistent with the actual use process, thereby improving product accuracy.

[0029] It should be noted that the method of forming the annular cavity 7 is not limited to this. The inner peripheral wall of the constraint cavity 11 may also have an annular groove 103 , and the annular groove 103 and the outer peripheral wall of the outer layer member 10 together form the annular cavity 7 .

[0030] In one embodiment, Figure 1 and Figure 2 As shown, a first sealing ring 81 is provided between the restraining chamber 11 and the outer layer member 10 , and the first sealing ring 81 is located at the rear of the annular chamber 7 along the fluid flow direction.

[0031] like Figure 1 and Figure 2 As shown, the constraint cavity 11 and the outer layer 10 are provided with mutually matching abutting surfaces, and the first sealing ring 81 is provided between the two mutually matching abutting surfaces. The first sealing ring 81 can effectively prevent the fluid in the annular cavity 7 from leaking out, thereby ensuring the accuracy of the measurement result of the thermal flow sensor 5.

[0032] In one embodiment, Figure 1 and Figure 2 As shown, the outer layer restraint tooling 1 is also provided with a fluid outlet 13 and a sensor outlet channel 14 . The fluid outlet 13 is used to connect to the outlet of the laminar flow channel 30 , and the sensor outlet channel 14 connects the outlet of the thermal flow sensor 5 and the fluid outlet 13 .

[0033] In this way, the confluence of the laminar flow channel 30 and the flow path of the thermal flow sensor 5 is achieved, which is as consistent as possible with the working process of the laminar flow component structure in the flow meter, thereby improving the accuracy of the online measurement results.

[0034] In one embodiment, Figure 1 and Figure 2As shown, a second sealing ring 82 is provided between the sliding portion 31 and the pressing block accommodating cavity 21 .

[0035] The second sealing ring 82 is provided to prevent the fluid in the fluid cavity 4 from leaking out. A mounting groove may be provided on the sliding portion 31, and the second sealing ring 82 is installed in the mounting groove. The second sealing ring 82 may be a Y-shaped sealing ring.

[0036] In one embodiment, Figure 1 and Figure 2 As shown, a third sealing ring 83 is provided between the pressing block sliding fitting 2 and the outer layer component restraining fitting 1 .

[0037] The third sealing ring 83 is provided to ensure the sealing of the joint between the pressing block sliding fitting 2 and the outer layer restraining fitting 1 to prevent fluid leakage.

[0038] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A laminar flow structure press-fit online testing device, characterized in that: The laminar flow component structure comprises an outer layer component (10) and an inner plug component (20), wherein the inner plug component (20) is inserted into the outer layer component (10), and a laminar flow channel (30) is formed between the outer layer component (10) and the inner plug component (20) by interference fit between a protrusion provided on one of the outer layer component (10) and the inner plug component (20); the outer layer component (10) has an inner diameter tapered section (101), and the inner plug component (20) has an outer diameter tapered section (201) axially overlapping with the inner diameter tapered section (101), so that the inner plug component (20) has different flow resistances at different insertion depths. The press-fit online testing device comprises: An outer layer member restraining tool (1) having a restraining cavity (11) for restraining the outer layer member (10), wherein both ends of the restraining cavity (11) are open; A pressing block sliding fitting (2) is used for sealingly contacting the end of the outer layer member restraining fitting (1) facing the inlet side of the laminar flow channel (30), and has a pressing block accommodating cavity (21) and a fluid inlet (22); A pressing block (3) is used to press the inner plug (20) into the outer layer (10) along a pressing direction, and comprises a sliding portion (31) and a non-contact portion (32) arranged in sequence along the pressing direction, wherein the sliding portion (31) is sealingly slidably mounted in the pressing block accommodating cavity (21), and the non-contact portion (32) and the inner peripheral wall of the pressing block accommodating cavity (21) together form a fluid cavity (4) connected to the fluid inlet (22), and the fluid cavity (4) is used to connect to the laminar flow channel (30); A thermal flow sensor (5), wherein the pressure block sliding fixture (2) is provided with a sensor inlet channel (12) connected to the fluid cavity (4), or the outer layer member restraining fixture (1) is provided with a sensor inlet channel (12) connected to the entrance of the laminar flow channel (30), and the inlet of the thermal flow sensor (5) is connected to the sensor inlet channel (12).

2. The laminar flow structure press-fit online testing device according to claim 1 is characterized in that: It also includes a locking block (6), the locking block (6) being located outside the pressing block sliding fitting (2) and connected to the end of the pressing block (3) away from the inner plug (20); The end of the pressure block sliding fixture (2) away from the outer layer member restraining fixture (1) is provided with a through hole for the locking block (6) or the pressure block (3) to pass through, and the through hole is configured to prevent the locking block (6) from entering the pressure block sliding fixture (2) and prevent the pressure block (3) from detaching from the pressure block sliding fixture (2).

3. The laminar flow structure press-fit online testing device according to claim 1 is characterized in that: The thermal flow sensor (5) is mounted on the outer layer member restraining fixture (1), and the sensor inlet channel (12) is arranged on the outer layer member restraining fixture (1).

4. The laminar flow structure press-fit online testing device according to claim 3 is characterized in that: A sensor communication port (102) is provided in the circumferential direction of the end of the outer layer member (10) close to the pressing block (3); wherein: An annular groove (103) is provided on the outer peripheral wall of the outer layer member (10) at the end portion close to the pressure block (3); the annular groove (103) and the inner peripheral wall of the constraint cavity (11) together form an annular cavity (7); and the sensor communication port (102) is connected to the sensor inlet channel (12) via the annular cavity (7).

5. The laminar flow structure press-fit online testing device according to claim 4 is characterized in that: A first sealing ring (81) is provided between the restraining chamber (11) and the outer layer member (10), and the first sealing ring (81) is located at the rear of the annular chamber (7) along the flow direction of the fluid.

6. The laminar flow structure press-fit online testing device according to claim 3 is characterized in that: The outer layer restraining tooling (1) is further provided with a fluid outlet (13) and a sensor outflow channel (14); the fluid outlet (13) is used to communicate with the outlet of the laminar flow channel (30); and the sensor outflow channel (14) is connected with the outflow port of the thermal flow sensor (5) and the fluid outlet (13).

7. The laminar flow structure press-fit online testing device according to claim 1, characterized in that: A second sealing ring (82) is provided between the sliding portion (31) and the pressing block accommodating cavity (21).

8. The laminar flow structure press-fit online testing device according to claim 1 is characterized in that: A third sealing ring (83) is provided between the pressing block sliding fitting (2) and the outer layer member restraining fitting (1).

9. A method for an online testing device for press-fitting a laminar flow structure according to any one of claims 1 to 8, characterized in that: Methods include: Step S1, the outer layer member (10) is placed in the restraining cavity (11) and the inner plug member (20) is inserted into the outer layer member (10); Step S2, making the pressing block sliding fitting (2) seal and contact the inlet end of the constraint chamber (11) facing the laminar flow channel (30); Step S3, outputting the target flow rate to the fluid inlet (22) of the pressing block sliding fitting (2), during which the pressing block (3) presses the inner plug (20) and deforms the protrusion, and the thermal flow sensor (5) measures the flow rate; Step S4, when the flow value measured by the thermal flow sensor (5) reaches a preset flow value, the pressing block (3) stops pressing.

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