An exhaust moisture detection device for oven

Abstract

The invention relates to the field of oven exhaust moisture detection, and specifically to an oven exhaust moisture detection device, comprising an oven, a negative pressure exhaust component and a condensation reflux component, the negative pressure exhaust component comprising an air bin, a centrifugal fan and a plurality of exhaust pipes, a diffusion cover is provided on one end of each exhaust pipe, an air inlet is provided on the diffusion cover, a negative pressure valve and a humidity sensor are provided in the diffusion cover, the negative pressure valve comprises a spacer ring, an elastic diaphragm and a No. 1 plugging pin, the condensation reflux component comprises a T-shaped pipe and a spiral condenser, a drain pipe is connected to the vertical portion of the T-shaped pipe, a pressure relief valve is provided in the drain pipe, when liquid water flows into the drain pipe, the liquid water will flow downward into the pressure relief valve, as the amount of liquid water increases, the pressure relief valve will open the drain pipe, so as to discharge the liquid water in the drain pipe, to prevent excessive pressure in the drain pipe, when the amount of liquid water in the drain pipe decreases, the pressure relief valve will close the drain pipe, so as to prevent a large amount of gas from leaking from the drain pipe.

Description

Technical Field

[0001] The invention relates to the field of exhaust moisture detection of ovens, and in particular to an exhaust moisture detection device for ovens. Background Art

[0002] Oven, also known as baking oven, drying oven, electric blast oven, hot air circulation oven, etc., is a device used to heat, dry or bake items. The moisture detection of oven exhaust is mainly based on the principle of heat conduction or humidity detection. The moisture content of the sample or the oven can be obtained by heating to evaporate the moisture in the sample, or by directly detecting the humidity inside the oven or in the exhaust through a humidity detection probe.

[0003] The existing Chinese patent with publication number CN116754714B discloses a device and method for detecting moisture in oven exhaust to solve the problem of uneven heating of workpieces. However, the above patent also has the following defects:

[0004] First, the above patent connects several air intake pipes with the connecting pipe in sequence by rotating the limit sleeve, and then extracts the gas in the corresponding area of ​​the oven through the air intake pipe, and finally measures the moisture content values ​​of different areas in the oven. However, in the detection process of the above patent, since the limit sleeve ring rotates intermittently, several air intake pipes will be connected with the connecting pipe in sequence, which will cause a time delay in the whole detection process. That is to say, in the process of detecting multiple air extraction ports in sequence, the humidity condition in the oven may have changed, so that the finally calculated average value cannot accurately reflect the actual humidity condition of different areas at the same time. For the situation where the humidity changes rapidly during the drying process, this time delay may make the system that controls the drying effect unable to make accurate adjustments in time, affecting the drying quality and efficiency, and ultimately unable to accurately carry out subsequent local heat changes;

[0005] Secondly, because the oven is in a closed state when it is working, during the process of vacuuming to detect moisture, the air pressure in the oven will gradually decrease due to the lack of outside air entering, which will cause an imbalance in the air pressure inside and outside the oven. The outside air pressure will continue to squeeze the oven, and eventually reduce the service life of the oven.

[0006] Therefore, it is necessary to provide an exhaust moisture detection device for an oven to solve the above problems. Summary of the invention

[0007] Based on this, it is necessary to provide an exhaust moisture detection device for an oven in response to the existing technical problems.

[0008] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: an exhaust moisture detection device for an oven, comprising an oven, a negative pressure exhaust component and a condensation reflux component, the negative pressure exhaust component comprising an air bin, a centrifugal fan and a plurality of exhaust pipes, the air bin is arranged on the back side of the oven, a diffusion mask is arranged on one end of each exhaust pipe, the diffusion mask is connected to the back side of the oven, an air inlet connected to the oven is arranged on the diffusion mask, the other end of each exhaust pipe is connected to the air bin, a negative pressure valve and a humidity sensor are arranged in the diffusion mask, the negative pressure valve is close to the air inlet, the humidity sensor is close to the exhaust pipe, the negative pressure valve It includes a spacer ring, an elastic diaphragm and a No. 1 plugging pin. The spacer ring is coaxially arranged in the expansion housing. The elastic diaphragm is connected to the spacer ring. The No. 1 plugging pin covers the air inlet. The elastic diaphragm is provided with a connecting rod connected to the No. 1 plugging pin. The spacer ring is provided with a plurality of air vents equidistantly distributed along the circumferential direction of the spacer ring. The centrifugal fan is arranged on the side of the air bin. The centrifugal fan is provided with an air suction port and an air exhaust port. The air suction port is connected to the air bin. The condensation reflux assembly includes a T-shaped pipe and a spiral condenser. The two ends of the horizontal part of the T-shaped pipe connect the spiral condenser and the exhaust port. The vertical part of the T-shaped pipe is connected with a drain pipe, and a pressure relief valve is provided in the drain pipe.

[0009] Furthermore, each expansion cover includes an expansion shell and a cylindrical shell, one end of the cylindrical shell is fixedly connected to the outer wall of the oven, the expansion shell has a large diameter at one end facing the cylindrical shell, and the diameter of the other end of the expansion shell gradually decreases, the large-diameter end of the expansion shell is coaxially fixed to the cylindrical shell, a No. 1 ring is coaxially formed on the large-diameter end of the expansion shell, and a No. 2 ring is formed on the end of the cylindrical shell facing the expansion shell, a number of No. 1 strip holes equidistantly distributed along the circumferential direction of the No. 1 ring are opened on the No. 1 ring, and a number of No. 2 strip holes equidistantly distributed along the circumferential direction of the No. 2 ring are opened on the No. 2 ring, an elastic diaphragm is coaxially arranged between the expansion shell and the cylindrical shell, and the outer edge of the elastic diaphragm is clamped between the No. 1 ring and the No. 2 ring, the No. 1 ring and the No. 2 ring are combined to form a spacer ring, each No. 1 strip hole is connected to the corresponding No. 2 strip hole, and the No. 1 strip hole and the No. 2 strip hole are combined to form a vent.

[0010] Furthermore, each air inlet is opened at one end of the cylindrical shell away from the expanded shell, and a No. 1 conical groove is formed in the air inlet. The small-diameter end of the No. 1 conical groove faces the air inlet, and the large-diameter end of the No. 1 conical groove faces the elastic diaphragm. The No. 1 blocking pin is conical, and the connecting rod is coaxially formed on the side of the No. 1 blocking pin facing the elastic diaphragm. One end of the connecting rod extends toward the elastic diaphragm, and one side of the elastic diaphragm is provided with a screw for fixing the elastic diaphragm to the connecting rod. A limiting ring is coaxially provided in the cylindrical shell, and a plurality of strip rods connected to the inner wall of the cylindrical shell are provided on the limiting ring, and the connecting rod coaxially passes through the limiting ring.

[0011] Furthermore, a first annular groove is provided on the outer wall of the second annular ring facing the first annular ring, a second annular groove is provided on the outer wall of the first annular ring facing the second annular ring, and a rubber ring is clamped between the first annular groove and the second annular groove.

[0012] Furthermore, a square port is formed on the small-diameter end of the expanded shell, and a plurality of connecting ports are formed on the outer wall of the gas bin, and the plurality of connecting ports correspond to the exhaust pipes, and both ends of each exhaust pipe are respectively connected to the square port and the connecting port.

[0013] Furthermore, a rectangular through groove is provided on one side of the square port, a strip through opening connected to the rectangular through groove is provided on the outer wall of the square port, a vertical strip card plate is provided in the strip through opening, each humidity sensor is fixedly connected to the corresponding strip card plate, an elastic buckle is formed at the upper end of the strip card plate, a plurality of inserts are formed at the lower end of the strip card plate, a stepped platform is formed at the upper end of the strip through opening, the elastic buckle is clamped on the stepped platform, a plurality of slots are provided at the lower end of the strip through opening, and each insert is inserted in the corresponding slot.

[0014] Furthermore, the centrifugal fan includes a volute, a wind wheel and a rotating shaft. The volute is fixed to the side of the air bin, the air intake port is arranged on the side wall of one side of the volute, the air exhaust port is formed on the peripheral wall of the volute, the rotating shaft rotates horizontally in the volute, the wind wheel is arranged in the volute, and the wind wheel is coaxially fixed to the rotating shaft.

[0015] Furthermore, a horizontal cylindrical tube is connected to the exhaust port, one end of the horizontal portion of the T-shaped tube is coaxially connected to the cylindrical tube, and two symmetrical arc-shaped extension portions are formed between the vertical portion and the horizontal portion of the T-shaped tube, and an arc-shaped slide groove is provided in each arc-shaped extension portion.

[0016] Furthermore, the pressure relief valve includes a No. 2 blocking pin, a liquid storage bucket, a spring and a retaining ring. A No. 1 convex ring is coaxially formed in the drain pipe, and the No. 1 convex ring divides the inner cavity of the drain pipe into a No. 1 cavity and a No. 2 cavity distributed up and down. A through hole connected to the No. 2 cavity is provided on the No. 1 cavity. The retaining ring and the liquid storage bucket are both arranged in the No. 2 cavity, and the liquid storage bucket passes through the retaining ring. A No. 2 convex ring is formed on the outer wall of the upper end of the liquid storage bucket. The spring is sleeved on the liquid storage bucket, and the two ends of the spring are respectively in conflict with the retaining ring and the No. 2 convex ring. The No. 2 blocking pin is arranged in the No. 1 cavity, and a transmission rod connected to the liquid storage bucket vertically downward is formed at the bottom of the No. 2 blocking pin. The lower end of the liquid storage bucket gradually shrinks into a cone shape. A rubber sheet is fixedly provided at the bottom of the liquid storage bucket, and a cross mouth is opened on the rubber sheet. A sealing cover plate is fixedly provided at the bottom of the drain pipe, and a plug that vertically penetrates into the drain pipe upward is fixed on the sealing cover plate.

[0017] Furthermore, the lower end of the No. 1 cavity gradually shrinks into a No. 2 conical groove, the small-diameter end of the No. 2 conical groove is connected to the through hole, the upper half of the No. 2 blocking pin is formed with a No. 1 conical surface with the small-diameter end facing upward, and the top of the No. 2 blocking pin is round-headed, and the lower half of the No. 2 blocking pin is formed with a No. 2 conical surface matching the No. 2 conical groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First, when the centrifugal fan is started, it will generate negative pressure in the air bin, so that each exhaust pipe connected to the air bin will generate suction, so that the negative pressure valve will open the air inlet due to the negative pressure suction, and then the gas in different areas of the oven will be simultaneously sucked into several expansion masks, and finally the moisture content of the gas will be detected through the humidity sensor in each expansion mask. The device can simultaneously detect the moisture content of the gas in different areas of the oven, so as to avoid time delay in the detection process and ultimately improve the detection accuracy;

[0020] Secondly, after the gas in the oven is extracted, the gas will be thrown into the T-tube from the centrifugal fan. The gas passing through the T-tube will flow upward along the spiral condenser tube. During this process, the moisture in the gas will be condensed and precipitated into liquid water. Finally, the liquid water will flow down along the spiral condenser tube into the drain pipe at the lower end of the T-tube for storage, and the dried gas will be re-introduced into the oven, so as to balance the pressure inside and outside the oven and prevent the oven from being squeezed and deformed due to the imbalance of internal and external air pressure;

[0021] Third, when liquid water flows into the drain pipe, the liquid water will flow downward into the pressure relief valve. As the amount of liquid water increases, the pressure relief valve will open the drain pipe to discharge the liquid water in the drain pipe and prevent excessive pressure in the drain pipe. When the amount of liquid water in the drain pipe decreases, the pressure relief valve will close the drain pipe to prevent a large amount of gas from leaking from the drain pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 It is a top view of the expansion mask;

[0025] Figure 4 yes Figure 3 Section view along line AA;

[0026] Figure 5 yes Figure 4 A1 is a partial enlarged schematic diagram;

[0027] Figure 6 yes Figure 4 A2 is a partial enlarged schematic diagram;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the expansion mask;

[0029] Figure 8 It is a three-dimensional structural exploded diagram of the expansion mask;

[0030] Fig. 9 yes Figure 8 A3 is a partial enlarged schematic diagram;

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the expanded shell;

[0032] Fig.11 yes Fig.10 A4 is a partial enlarged schematic diagram;

[0033] Fig.12 It is a schematic diagram of the three-dimensional structure of the humidity sensor;

[0034] Fig.13 It is a three-dimensional structural exploded diagram of the centrifugal fan and the air silo;

[0035] Fig.14 It is a three-dimensional structural exploded diagram of a centrifugal fan;

[0036] Fig.15 It is a three-dimensional structural diagram of a T-tube;

[0037] Fig.16 It is a top view of the T-tube;

[0038] Fig.17 yes Fig.16 Sectional view along line BB;

[0039] Fig.18 yes Fig.17 A partial enlarged schematic diagram indicated by A5;

[0040] Fig.19 It is a three-dimensional structural diagram of the drainage pipe;

[0041] Fig. 20 It is a three-dimensional structural exploded diagram of the pressure relief valve and the drain pipe.

[0042] The numbers in the figure are: 1. oven; 2. air bin; 3. centrifugal fan; 4. exhaust pipe; 5. expansion cover; 6. air inlet; 7. humidity sensor; 8. spacer ring; 9. elastic diaphragm; 10. No. 1 plugging pin; 11. connecting rod; 12. vent hole; 13. exhaust port; 14. exhaust port; 15. T-shaped pipe; 16. spiral condenser; 17. drain pipe; 18. expansion shell; 19. cylindrical shell; 20. No. 1 circular ring; 21. No. 2 circular ring; 22. No. 1 strip hole; 23. No. 2 strip hole; 24. No. 1 conical groove; 25. screw; 26. limit ring; 27. strip rod; 28. No. 1 annular groove; 29. ​​No. 2 annular groove; 30. rubber ring; 31. square port ; 32. Connecting port; 33. Rectangular through groove; 34. Strip through hole; 35. Strip card plate; 36. Elastic buckle; 37. Insert; 38. Step platform; 39. Slot; 40. Volute; 41. Wind wheel; 42. Rotating shaft; 43. Cylindrical tube; 44. Arc-shaped expansion part; 45. Arc-shaped slide groove; 46. No. 2 blocking pin; 47. Liquid storage bucket; 48. Spring; 49. Retaining ring; 50. No. 1 convex ring; 51. No. 1 cavity; 52. No. 2 cavity; 53. Through hole; 54. No. 2 convex ring; 55. Transmission rod; 56. Rubber sheet; 57. Cross mouth; 58. Sealing cover plate; 59. Insert tube; 60. No. 2 conical groove; 61. No. 1 conical surface; 62. No. 2 conical surface. DETAILED DESCRIPTION

[0043] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] refer to Figures 1 to 20 The exhaust moisture detection device for an oven shown in the figure comprises an oven 1, a negative pressure exhaust assembly and a condensation reflux assembly, the negative pressure exhaust assembly comprises an air bin 2, a centrifugal fan 3 and a plurality of exhaust pipes 4, the air bin 2 is arranged on the back side of the oven 1, and a diffuser cover 5 is arranged on one end of each exhaust pipe 4, the diffuser cover 5 is connected to the back side of the oven 1, and the diffuser cover 5 (such as Figure 7 ) is provided with an air inlet 6 connected to the oven 1, the other end of each exhaust pipe 4 is connected to the air bin 2, a negative pressure valve and a humidity sensor 7 are provided in the expansion cover 5, the negative pressure valve is close to the air inlet 6, the humidity sensor 7 is close to the exhaust pipe 4, the negative pressure valve includes a spacer ring 8, an elastic diaphragm 9 and a No. 1 plugging pin 10, the spacer ring 8 (as shown Figure 5 As shown) is coaxially arranged in the expansion cover 5, the elastic diaphragm 9 is connected to the spacer ring 8, the No. 1 plugging pin 10 covers the air inlet 6, the elastic diaphragm 9 is provided with a connecting rod 11 connected to the No. 1 plugging pin 10, and the spacer ring 8 is provided with a plurality of vent holes 12 equidistantly distributed along the circumferential direction of the spacer ring 8. The centrifugal fan 3 (as shown) Fig.14The centrifugal fan 3 is provided with an air suction port 13 and an air exhaust port 14, and the air suction port 13 is connected to the air bin 2 (as shown in FIG. Fig.13 As shown in FIG. 1 ), the condensation reflux assembly includes a T-shaped tube 15 and a spiral condensation tube 16 (as shown in FIG. Figure 2 As shown in the figure, the two ends of the horizontal portion of the T-shaped tube 15 connect the spiral condenser 16 and the exhaust port 14, and the vertical portion of the T-shaped tube 15 is connected to a drain pipe 17, in which a pressure relief valve is provided.

[0045] In the initial state, the elastic diaphragm 9 in the negative pressure valve will drive the No. 1 blocking pin 10 to block the air inlet 6 through the connecting rod 11, so as to prevent the gas in the oven 1 from being discharged to the outside of the oven 1 by itself. When it is necessary to detect the moisture of the gas in the oven 1, the centrifugal fan 3 is started, and the centrifugal fan 3 will exhaust the air from the gas bin 2. Since the gas bin 2 is connected to the oven 1 through the exhaust pipe 4, a negative pressure will be generated in each exhaust pipe 4 during this process, so that the elastic diaphragm 9 in the expansion mask 5 will be sucked toward the exhaust pipe 4. Finally, the elastic diaphragm 9 will drive the No. 1 blocking pin 10 away from the air inlet 6 through the connecting rod 11. When the air inlet 6 is opened, the gas in the oven 1 will enter the centrifugal fan 3 along the expansion mask 5, the exhaust pipe 4 and the air bin 2 in turn. When the gas passes through the expansion mask 5, the humidity sensor 7 will detect the moisture content of the gas in the current expansion mask 5. Since the plurality of exhaust pipes 4 are distributed at different positions on the oven 1, the plurality of humidity sensors 7 will detect the moisture content of the gas in different areas of the oven 1, and finally the detected values ​​are used to perform local heat changes on different areas of the oven 1. In actual use, the oven 1 is provided with a plurality of independently arranged heating modules (not shown in the figure), and the plurality of heating modules correspond to the plurality of expansion masks 5 respectively. The plurality of humidity sensors 7 are synchronously connected to the host computer (not shown in the figure), and the host computer is used to calculate the average value detected by the plurality of humidity sensors 7. If the moisture content of the gas extracted from the current expansion mask 5 is greater than the average value, then The heating module corresponding to the current expansion mask 5 will further increase the temperature. If the water content value of the gas extracted from the current expansion mask 5 is less than the average value, the heating module corresponding to the current expansion mask 5 will reduce the temperature accordingly. Finally, when the water content values ​​detected by several humidity sensors 7 are close to the same, it means that all parts of the special-shaped workpiece in the current oven 1 are heated evenly. When the gas in the oven 1 enters the centrifugal fan 3, the centrifugal fan 3 will throw the gas to the exhaust port 14. Thereafter, the gas will pass through the T-tube 15 and the spiral condenser 16 in turn. The gas entering the spiral condenser 16 will gradually cool down, so that the moisture in the gas will condense and precipitate into liquid water. Finally, the liquid water will fall down into the T-tube 15 along the spiral condenser 16. The liquid water falling into the T-shaped pipe 15 will be discharged downward into the drain pipe 17. At this time, the pressure relief valve will block the drain pipe 17 to prevent the gas discharged from the centrifugal fan 3 from being discharged from the drain pipe 17. When the water pressure in the drain pipe 17 is too high, the drain pipe 17 is opened to allow the liquid water in the drain pipe 17 to be discharged. After the gas passes through the condensed precipitate, the remaining dry gas will be discharged into the oven 1 again through the reflux pipeline (not shown in the figure) to balance the air pressure in the oven 1. A preheating module (not shown in the figure) is installed on the top of the oven 1. The dry gas will enter the oven 1 after passing through the preheating module to prevent the cooled dry gas from affecting the drying work of the oven 1. When the regional temperature in the oven 1 changes, the centrifugal fan 3 stops working.At this time, the elastic diaphragm 9 will drive the No. 1 blocking pin 10 to block the corresponding air inlet 6 again through the connecting rod 11 due to its elastic force. During processing, the elastic diaphragm 9 needs to ensure that its elastic force can resist the high pressure in the oven 1. That is, during the drying process of the oven 1, the No. 1 blocking pin 10 will not be pushed open by the high pressure in the oven 1 due to the elastic force of the elastic diaphragm 9. When the centrifugal fan 3 is started, the negative pressure generated in the exhaust pipe 4 will be much greater than the elastic force of the elastic diaphragm 9, so that the elastic diaphragm 9 will overcome its own elastic force and be sucked into the corresponding exhaust pipe 4.

[0046] In order to show how the elastic membrane 9 is installed, the following features are set:

[0047] Each expansion cover 5 includes an expansion shell 18 and a cylindrical shell 19, one end of the cylindrical shell 19 is fixedly connected to the outer wall of the oven 1, the expansion shell 18 has a large diameter at one end facing the cylindrical shell 19, and the diameter of the other end of the expansion shell 18 gradually decreases, the large diameter end of the expansion shell 18 is coaxially fixedly connected to the cylindrical shell 19, a No. 1 circular ring 20 is coaxially formed on the large diameter end of the expansion shell 18, and a No. 2 circular ring 21 is formed on one end of the cylindrical shell 19 facing the expansion shell 18, and a number of No. 1 strip holes 22 equidistantly distributed along the circumferential direction of the No. 1 circular ring 20 are opened, and a number of No. 2 strip holes 23 equidistantly distributed along the circumferential direction of the No. 2 circular ring 21 are opened (such as Fig. 9 As shown in the figure, the elastic diaphragm 9 is coaxially arranged between the expanded shell 18 and the cylindrical shell 19, and the outer edge of the elastic diaphragm 9 is clamped between the No. 1 circular ring 20 and the No. 2 circular ring 21, the No. 1 circular ring 20 and the No. 2 circular ring 21 are combined to form a spacer ring 8, each No. 1 strip hole 22 is connected to the corresponding No. 2 strip hole 23, and the No. 1 strip hole 22 and the No. 2 strip hole 23 are combined to form a vent hole 12.

[0048] When installing the elastic diaphragm 9, first place the elastic diaphragm 9 coaxially between the flared shell 18 and the cylindrical shell 19, then clamp the outer edge of the elastic diaphragm 9 between the first ring 20 and the second ring 21, and finally fix the flared shell 18 and the cylindrical shell 19 together. When the flared shell 18 and the cylindrical shell 19 are fixed together, the elastic diaphragm 9 is fixed.

[0049] In order to show how the connecting rod 11 connects the first plug 10 and the elastic diaphragm 9, the following features are set:

[0050] Each air inlet 6 is opened at one end of the cylindrical shell 19 away from the flared shell 18, and a No. 1 conical groove 24 is formed in the air inlet 6. The small-diameter end of the No. 1 conical groove 24 faces the air inlet 6, and the large-diameter end of the No. 1 conical groove 24 faces the elastic diaphragm 9. The No. 1 blocking pin 10 is conical, and the connecting rod 11 is coaxially formed on the side of the No. 1 blocking pin 10 facing the elastic diaphragm 9. One end of the connecting rod 11 extends to the elastic diaphragm 9. A screw 25 for fixing the elastic diaphragm 9 to the connecting rod 11 is provided on one side of the elastic diaphragm 9. A limiting ring 26 is coaxially provided in the cylindrical shell 19, and a plurality of strip rods 27 (such as Figure 8 As shown), the connecting rod 11 passes through the limiting ring 26 coaxially.

[0051] Before installing the elastic diaphragm 9 into the expansion housing 5, first connect the No. 1 plugging pin 10 with the elastic diaphragm 9. During this process, one end of the connecting rod 11 passes through the limit ring 26, and then one end of the connecting rod 11 is attached to the elastic diaphragm 9. Finally, the screw 25 passes through the elastic diaphragm 9, and the elastic diaphragm 9 is fixedly connected to the connecting rod 11 by the screw 25. When the connecting rod 11 is connected to the elastic diaphragm 9, the displacement of the No. 1 plugging pin 10 can be controlled by the deformation of the elastic diaphragm 9. In the initial state, the elastic diaphragm 9 The No. 1 blocking pin 10 is driven toward the air inlet 6 by the connecting rod 11. At this time, the No. 1 blocking pin 10 will be stuck on the No. 1 conical groove 24 to block the air inlet 6. When the centrifugal fan 3 is started, the elastic diaphragm 9 will be sucked toward the expansion shell 18. At this time, the No. 1 blocking pin 10 will move away from the No. 1 conical groove 24 to open the air inlet 6. Among them, the limit ring 26 is used to limit the displacement direction of the connecting rod 11. Finally, when the elastic diaphragm 9 is deformed, it is ensured that the No. 1 blocking pin 10 can be accurately stuck on the No. 1 conical groove 24.

[0052] In order to prevent gas from escaping between the flared shell 18 and the cylindrical shell 19, the following features are provided:

[0053] A first annular groove 28 is formed on the outer wall of the second annular ring 21 facing the first annular ring 20 , a second annular groove 29 is formed on the outer wall of the first annular ring 20 facing the second annular ring 21 , and a rubber ring 30 is clamped between the first annular groove 28 and the second annular groove 29 .

[0054] When the flared shell 18 and the cylindrical shell 19 are combined, the rubber ring 30 is fixed between the first annular groove 28 and the second annular groove 29 , so that the rubber ring 30 prevents gas from leaking from between the flared shell 18 and the cylindrical shell 19 .

[0055] In order to show how the two ends of each exhaust pipe 4 are connected to the air chamber 2 and the expansion cover 5 respectively, the following features are set:

[0056] The small-diameter end of the expanded shell 18 is formed with a square port 31 (such as Figure 8As shown in the figure, a plurality of connection ports 32 are formed on the outer wall of the gas bin 2, and the plurality of connection ports 32 correspond to the air extraction pipes 4, and the two ends of each air extraction pipe 4 are respectively connected to the square port 31 and the connection port 32.

[0057] Each exhaust pipe 4 is connected to the gas bin 2 and the expansion shell 18 through the square port 31 and the connecting port 32 respectively. When the centrifugal fan 3 is started, the gas in the oven 1 will enter the centrifugal fan 3 through the expansion shell 5, the exhaust pipe 4 and the gas bin 2 in turn.

[0058] To show how the humidity sensor 7 is installed, the following features are provided:

[0059] A rectangular through slot 33 (such as Fig.11 As shown in the figure, a strip opening 34 connected to the rectangular through groove 33 is provided on the outer wall of the square port 31, and a vertical strip card plate 35 is provided in the strip opening 34. Each humidity sensor 7 is fixedly connected to the corresponding strip card plate 35. An elastic buckle 36 is formed at the upper end of the strip card plate 35, and a plurality of inserts 37 are formed at the lower end of the strip card plate 35. A stepped platform 38 is formed at the upper end of the strip opening 34, and the elastic buckle 36 is clamped on the stepped platform 38. A plurality of slots 39 are provided at the lower end of the strip opening 34, and each insert 37 is inserted in the corresponding slot 39.

[0060] The humidity sensor 7 is fixed in the rectangular through groove 33 by the strip card plate 35. When installing, the humidity sensor 7 is first inserted into the rectangular through groove 33, and then the insert 37 at the lower end of the strip card plate 35 is inserted into the corresponding slot 39, and finally the elastic buckle 36 is clamped on the step platform 38. The strip card plate 35 is used to facilitate the disassembly and assembly of the humidity sensor 7.

[0061] In order to show the specific structure of the centrifugal fan 3, the following features are set:

[0062] The centrifugal fan 3 includes a volute 40, a wind wheel 41 and a rotating shaft 42. The volute 40 is fixed to the side of the air bin 2. The air suction port 13 is arranged on the side wall of one side of the volute 40. The air exhaust port 14 is formed on the peripheral wall of the volute 40. The rotating shaft 42 rotates horizontally in the volute 40. The wind wheel 41 is arranged in the volute 40, and the wind wheel 41 is coaxially fixed to the rotating shaft 42.

[0063] The rotating shaft 42 is driven to rotate by an external driving source (not shown in the figure). When the rotating shaft 42 rotates, the rotating shaft 42 will drive the wind wheel 41 to rotate at a high speed, so that the high-speed rotation of the wind wheel 41 will generate negative pressure at the exhaust port 13, so that the gas in the oven 1 will enter the volute 40 through the expansion cover 5, the exhaust pipe 4 and the air bin 2 in sequence. The gas entering the volute 40 will be thrown toward the exhaust port 14 along the inner wall of the volute 40 due to the centrifugal force, and finally the gas in the volute 40 will enter the T-shaped pipe 15 through the exhaust port 14.

[0064] In order to ensure that the liquid water in the spiral condenser tube 16 can smoothly fall down into the drain pipe 17, the following features are provided:

[0065] The exhaust port 14 is connected to a horizontal cylindrical tube 43 (such as Fig.15 As shown in FIG. 1 , one end of the horizontal portion of the T-shaped tube 15 is coaxially connected to the cylindrical tube 43, and two symmetrical arc-shaped extension portions 44 are formed between the vertical portion and the horizontal portion of the T-shaped tube 15, and each arc-shaped extension portion 44 is provided with an arc-shaped slide groove 45 (as shown in FIG. Fig.17 as shown).

[0066] When the gas in the volute 40 enters the T-shaped tube 15, the gas will enter the spiral condenser 16 along the horizontal part of the T-shaped tube 15. When the gas rises along the spiral condenser 16, the moisture in the gas condenses into liquid water, and the liquid water will slide down from the spiral condenser 16 into the T-shaped tube 15 due to gravity. Finally, the liquid water entering the T-shaped tube 15 will fall down along the corresponding arc-shaped slide groove 45 into the drain pipe 17.

[0067] In order to show the specific structure of the pressure relief valve, the following features are set:

[0068] The pressure relief valve includes a second plug pin 46, a liquid storage bucket 47, a spring 48 and a retaining ring 49. A first convex ring 50 (such as Fig.18 As shown in the figure, the first convex ring 50 divides the inner cavity of the drain pipe 17 into a first cavity 51 and a second cavity 52 which are distributed up and down. The first cavity 51 is provided with a through hole 53 which is connected with the second cavity 52. ​​The retaining ring 49 and the liquid storage bucket 47 are both arranged in the second cavity 52, and the liquid storage bucket 47 passes through the retaining ring 49. The outer wall of the upper end of the liquid storage bucket 47 is formed with a second convex ring 54. The spring 48 is sleeved on the liquid storage bucket 47, and the two ends of the spring 48 are respectively connected with the retaining ring 49 and the second convex ring 54. The No. 1 convex ring 54 conflicts with each other, the No. 2 blocking pin 46 is arranged in the No. 1 cavity 51, and the bottom of the No. 2 blocking pin 46 is formed with a transmission rod 55 vertically downwardly connected to the liquid storage bucket 47, the lower end of the liquid storage bucket 47 is gradually reduced into a cone shape, and a rubber sheet 56 is fixedly provided at the bottom of the liquid storage bucket 47, and a cross opening 57 is opened on the rubber sheet 56, and a sealing cover plate 58 is fixedly provided at the bottom of the drain pipe 17, and a plug 59 is fixedly provided on the sealing cover plate 58 and vertically penetrated into the drain pipe 17 upward.

[0069] In the initial state, the liquid storage hopper 47 is in an ascending state due to the elastic force of the spring 48. At this time, the second convex ring 54 provided at the upper end of the liquid storage hopper 47 will conflict with the first convex ring 50 upwards, thereby limiting the upward travel of the liquid storage hopper 47. When the liquid storage hopper 47 is in an ascending state, the liquid storage hopper 47 will drive the second blocking pin 46 to separate upward from the through hole 53 through the transmission rod 55, so that the through hole 53 will be in an open state. At the same time, the rubber sheet 56 provided at the lower end of the liquid storage hopper 47 will move away from the insertion tube 59, so that the rubber sheet 56 is in a closed state, then when the gas in the volute 40 enters the T-shaped tube 15, the gas in the T-shaped tube 15 will not leak from the drain pipe 17, and when the liquid water in the spiral condenser tube 16 flows back into the T-shaped tube 15, the liquid water will fall downward into the No. 1 cavity 51 at the upper end of the drain pipe 17 through the corresponding arc chute 45. At this time, since the through hole 53 is in an open state, the liquid water falling into the No. 1 cavity 51 will fall downward into the liquid storage hopper 47 through the through hole 53, and since the rubber sheet 56 is in a closed state, the liquid water falling into the No. 1 cavity 51 will fall downward into the liquid storage hopper 47 through the through hole 53. When the liquid storage hopper 47 is in the closed state, more and more liquid water will gather in the liquid storage hopper 47. As the liquid water in the liquid storage hopper 47 increases, the weight of the liquid storage hopper 47 increases. At this time, the liquid storage hopper 47 will overcome the elastic force of the spring 48 and begin to fall. During this process, the rubber sheet 56 at the bottom of the liquid storage hopper 47 will gradually approach the insertion tube 59. Finally, the insertion tube 59 will pass through the rubber sheet 56 through the cross 57 on the rubber sheet 56. At this time, the liquid water in the liquid storage hopper 47 will be discharged to the outside of the drain pipe 17 through the insertion tube 59, and when the liquid storage hopper 47 is closed, the liquid water in the liquid storage hopper 47 will be discharged to the outside of the drain pipe 17 through the insertion tube 59. When the liquid water in 47 is drained, the No. 2 plugging pin 46 connected to the liquid storage bucket 47 through the transmission rod 55 will block the through hole 53 downward to prevent the subsequent liquid water from falling into the liquid storage bucket 47, and at the same time prevent the gas entering the T-tube 15 from being discharged from the insert tube 59. When the liquid water in the liquid storage bucket 47 is gradually discharged, the weight of the liquid storage bucket 47 gradually decreases, and the liquid storage bucket 47 will gradually rise due to the elastic force of the spring 48, then the through hole 53 will open again to allow the subsequent liquid water to fall into the liquid storage bucket 47.

[0070] In order to show how the second plugging pin 46 blocks the through hole 53, the following features are provided:

[0071] The lower end of the No. 1 cavity 51 gradually shrinks into a No. 2 conical groove 60, the small-diameter end of the No. 2 conical groove 60 is connected to the through hole 53, the upper half of the No. 2 blocking pin 46 is formed with a No. 1 conical surface 61 with the small-diameter end facing upward, and the top of the No. 2 blocking pin 46 is round-headed, and the lower half of the No. 2 blocking pin 46 is formed with a No. 2 conical surface 62 that matches the No. 2 conical groove 60.

[0072] When the liquid storage bucket 47 is in an ascending state, the No. 2 conical surface 62 will separate from the No. 2 conical groove 60. At this time, the through hole 53 is in an open state, and the liquid water in the T-tube 15 will slide down along the No. 1 conical surface 61, and finally enter the liquid storage bucket 47 in the No. 2 cavity 52 through the through hole 53. When the weight of the liquid storage bucket 47 increases, the liquid storage bucket 47 begins to descend, and the No. 2 blocking pin 46 will move downward toward the through hole 53. During this process, the No. 2 conical surface 62 will fit downward with the No. 2 conical groove 60, and finally the through hole 53 will be blocked by the No. 2 blocking pin 46.

[0073] Working principle:

[0074] In the initial state, the elastic diaphragm 9 in the negative pressure valve will drive the No. 1 blocking pin 10 to block the air inlet 6 through the connecting rod 11, so as to prevent the gas in the oven 1 from being discharged to the outside of the oven 1 by itself. When it is necessary to detect the moisture of the gas in the oven 1, the centrifugal fan 3 is started, and the centrifugal fan 3 will exhaust the air from the gas bin 2. Since the gas bin 2 is connected to the oven 1 through the exhaust pipe 4, a negative pressure will be generated in each exhaust pipe 4 during this process, so that the elastic diaphragm 9 in the expansion mask 5 will be sucked toward the exhaust pipe 4. Finally, the elastic diaphragm 9 will drive the No. 1 blocking pin 10 away from the air inlet 6 through the connecting rod 11. When the air inlet 6 is opened, the gas in the oven 1 will enter the centrifugal fan 3 along the expansion mask 5, the exhaust pipe 4 and the air bin 2 in turn. When the gas passes through the expansion mask 5, the humidity sensor 7 will detect the moisture content of the gas in the current expansion mask 5. Since the plurality of exhaust pipes 4 are distributed at different positions on the oven 1, the plurality of humidity sensors 7 will detect the moisture content of the gas in different areas of the oven 1, and finally the detected values ​​are used to perform local heat changes on different areas of the oven 1. In actual use, the oven 1 is provided with a plurality of independently arranged heating modules (not shown in the figure), and the plurality of heating modules correspond to the plurality of expansion masks 5 respectively. The plurality of humidity sensors 7 are synchronously connected to the host computer (not shown in the figure), and the host computer is used to calculate the average value detected by the plurality of humidity sensors 7. If the moisture content of the gas extracted from the current expansion mask 5 is greater than the average value, then The heating module corresponding to the current expansion mask 5 will further increase the temperature. If the water content value of the gas extracted from the current expansion mask 5 is less than the average value, the heating module corresponding to the current expansion mask 5 will reduce the temperature accordingly. Finally, when the water content values ​​detected by several humidity sensors 7 are close to the same, it means that all parts of the special-shaped workpiece in the current oven 1 are heated evenly. When the gas in the oven 1 enters the centrifugal fan 3, the centrifugal fan 3 will throw the gas to the exhaust port 14. Thereafter, the gas will pass through the T-tube 15 and the spiral condenser 16 in turn. The gas entering the spiral condenser 16 will gradually cool down, so that the moisture in the gas will condense and precipitate into liquid water. Finally, the liquid water will fall down into the T-tube 15 along the spiral condenser 16. The liquid water falling into the T-shaped pipe 15 will be discharged downward into the drain pipe 17. At this time, the pressure relief valve will block the drain pipe 17 to prevent the gas discharged from the centrifugal fan 3 from being discharged from the drain pipe 17. When the water pressure in the drain pipe 17 is too high, the drain pipe 17 is opened to allow the liquid water in the drain pipe 17 to be discharged. After the gas passes through the condensed precipitate, the remaining dry gas will be discharged into the oven 1 again through the reflux pipeline (not shown in the figure) to balance the air pressure in the oven 1. A preheating module (not shown in the figure) is installed on the top of the oven 1. The dry gas will enter the oven 1 after passing through the preheating module to prevent the cooled dry gas from affecting the drying work of the oven 1. When the regional temperature in the oven 1 changes, the centrifugal fan 3 stops working.At this time, the elastic diaphragm 9 will drive the No. 1 blocking pin 10 to block the corresponding air inlet 6 again through the connecting rod 11 due to its elastic force. During processing, the elastic diaphragm 9 needs to ensure that its elastic force can resist the high pressure in the oven 1. That is, during the drying process of the oven 1, the No. 1 blocking pin 10 will not be pushed open by the high pressure in the oven 1 due to the elastic force of the elastic diaphragm 9. When the centrifugal fan 3 is started, the negative pressure generated in the exhaust pipe 4 will be much greater than the elastic force of the elastic diaphragm 9, so that the elastic diaphragm 9 will overcome its own elastic force and be sucked into the corresponding exhaust pipe 4.

[0075] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An exhaust moisture detection device for an oven, comprising an oven (1), characterized in that: It also includes a negative pressure exhaust component and a condensation reflux component. The negative pressure exhaust component includes an air bin (2), a centrifugal fan (3) and a plurality of exhaust pipes (4). The air bin (2) is arranged on the back side of the oven (1). A diffusion cover (5) is arranged on one end of each exhaust pipe (4). The diffusion cover (5) is connected to the back side of the oven (1). An air inlet (6) connected to the oven (1) is arranged on the diffusion cover (5). The other end of each exhaust pipe (4) is connected to the air bin (2). A negative pressure valve and a humidity sensor (7) are arranged in the diffusion cover (5). The negative pressure valve is close to the air inlet (6). The humidity sensor (7) is close to the exhaust pipe (4). The negative pressure valve includes a spacer ring (8), an elastic diaphragm (9) and a No. 1 plugging pin (10). The spacer ring (8) is coaxially arranged in the diffusion cover (5). The elastic diaphragm (9) is connected to the spacer ring (8), a No. 1 plugging pin (10) covers the air inlet (6), the elastic diaphragm (9) is provided with a connecting rod (11) connected to the No. 1 plugging pin (10), the spacer ring (8) is provided with a plurality of vent holes (12) equidistantly distributed along the circumferential direction of the spacer ring (8), the centrifugal fan (3) is arranged on the side of the air bin (2), the centrifugal fan (3) is provided with an air suction port (13) and an air exhaust port (14), the air suction port (13) is connected to the air bin (2), the condensation reflux component comprises a T-shaped pipe (15) and a spiral condenser pipe (16), the two ends of the horizontal portion of the T-shaped pipe (15) connect the spiral condenser pipe (16) and the air exhaust port (14), the vertical portion of the T-shaped pipe (15) is connected with a drain pipe (17), and the drain pipe (17) ) is provided with a pressure relief valve, a horizontal cylindrical tube (43) is connected to the exhaust port (14), one end of the horizontal portion of the T-shaped tube (15) is coaxially connected to the cylindrical tube (43), two symmetrical arc-shaped expansion portions (44) are formed between the vertical portion and the horizontal portion of the T-shaped tube (15), each arc-shaped expansion portion (44) is provided with an arc-shaped slide groove (45), each expansion cover (5) comprises an expansion shell (18) and a cylindrical shell (19), one end of the cylindrical shell (19) is fixedly connected to the outer wall of the oven (1), the diameter of the expansion shell (18) facing the cylindrical shell (19) is large, and the diameter of the other end of the expansion shell (18) gradually decreases, the large diameter end of the expansion shell (18) is coaxially fixedly connected to the cylindrical shell (19), and the large diameter end of the expansion shell (18) is coaxially connected to the cylindrical shell (19). A first circular ring (20) is formed, a second circular ring (21) is formed on one end of the cylindrical shell (19) facing the flared shell (18), the first circular ring (20) is provided with a plurality of first strip holes (22) equidistantly distributed along the circumferential direction of the first circular ring (20), the second circular ring (21) is provided with a plurality of second strip holes (23) equidistantly distributed along the circumferential direction of the second circular ring (21), an elastic diaphragm (9) is coaxially arranged between the flared shell (18) and the cylindrical shell (19), and the outer edge of the elastic diaphragm (9) is sandwiched between the first circular ring (20) and the second circular ring (21), the first circular ring (20) and the second circular ring (21) are combined to form a spacer ring (8), each of the first strip holes (22) is connected to the corresponding second strip hole (23),The first strip hole (22) and the second strip hole (23) are combined to form a vent hole (12).

2. The exhaust moisture detection device for an oven according to claim 1, characterized in that: Each air inlet (6) is provided at one end of the cylindrical shell (19) away from the expansion shell (18), and a No. 1 conical groove (24) is formed in the air inlet (6), the small-diameter end of the No. 1 conical groove (24) faces the air inlet (6), and the large-diameter end of the No. 1 conical groove (24) faces the elastic diaphragm (9), the No. 1 blocking pin (10) is conical, the connecting rod (11) is coaxially formed on the side of the No. 1 blocking pin (10) facing the elastic diaphragm (9), one end of the connecting rod (11) extends toward the elastic diaphragm (9), and a screw (25) for fixing the elastic diaphragm (9) to the connecting rod (11) is provided on one side of the elastic diaphragm (9), a limiting ring (26) is coaxially provided in the cylindrical shell (19), and a plurality of strip rods (27) connected to the inner wall of the cylindrical shell (19) are provided on the limiting ring (26), and the connecting rod (11) coaxially passes through the limiting ring (26).

3. The exhaust moisture detection device for an oven according to claim 1, characterized in that: A first annular groove (28) is formed on the outer wall of the second annular ring (21) facing the first annular ring (20), a second annular groove (29) is formed on the outer wall of the first annular ring (20) facing the second annular ring (21), and a rubber ring (30) is clamped between the first annular groove (28) and the second annular groove (29).

4. The exhaust moisture detection device for an oven according to claim 1, characterized in that: A square port (31) is formed on the small-diameter end of the expanded shell (18), and a plurality of connecting ports (32) are formed on the outer wall of the gas chamber (2). The plurality of connecting ports (32) correspond to the air extraction pipes (4), and the two ends of each air extraction pipe (4) are respectively connected to the square port (31) and the connecting port (32).

5. The exhaust moisture detection device for an oven according to claim 4, characterized in that: A rectangular through slot (33) is provided on one side of the square port (31); a strip through slot (34) connected to the rectangular through slot (33) is provided on the outer wall of the square port (31); a vertical strip card (35) is provided in the strip through slot (34); each humidity sensor (7) is fixedly connected to the corresponding strip card (35); an elastic buckle (36) is formed at the upper end of the strip card (35); a plurality of inserts (37) are formed at the lower end of the strip card (35); a stepped platform (38) is formed at the upper end of the strip through slot (34); the elastic buckle (36) is clamped on the stepped platform (38); a plurality of slots (39) are provided at the lower end of the strip through slot (34); each insert (37) is inserted into a corresponding slot (39).

6. The exhaust moisture detection device for oven according to claim 1, characterized in that: The centrifugal fan (3) comprises a volute (40), a wind wheel (41) and a rotating shaft (42); the volute (40) is fixed to the side of the air bin (2); the air suction port (13) is arranged on a side wall of one side of the volute (40); the air discharge port (14) is formed on a peripheral wall of the volute (40); the rotating shaft (42) rotates horizontally in the volute (40); the wind wheel (41) is arranged in the volute (40), and the wind wheel (41) and the rotating shaft (42) are coaxially fixedly connected.

7. The exhaust moisture detection device for an oven according to claim 1, characterized in that: The pressure relief valve comprises a No. 2 plugging pin (46), a liquid storage bucket (47), a spring (48) and a retaining ring (49); a No. 1 convex ring (50) is coaxially formed in the drainage pipe (17); the No. 1 convex ring (50) divides the inner cavity of the drainage pipe (17) into a No. 1 cavity (51) and a No. 2 cavity (52) which are distributed up and down; the No. 1 cavity (51) is provided with a through hole (53) which is connected to the No. 2 cavity (52); the retaining ring (49) and the liquid storage bucket (47) are both arranged in the No. 2 cavity (52); the liquid storage bucket (47) passes through the retaining ring (49); a No. 2 convex ring (54) is formed on the outer wall of the upper end of the liquid storage bucket (47); the spring (48) is sleeved on the No. 1 cavity (51); and the retaining ring (49) and the liquid storage bucket (47) are arranged in the No. 2 cavity (52). On the liquid storage bucket (47), two ends of the spring (48) respectively contact the retaining ring (49) and the second convex ring (54), the second plugging pin (46) is arranged in the first cavity (51), the bottom of the second plugging pin (46) is formed with a transmission rod (55) vertically downwardly connected to the liquid storage bucket (47), the lower end of the liquid storage bucket (47) is gradually reduced into a cone shape, a rubber sheet (56) is fixedly provided at the bottom of the liquid storage bucket (47), a cross opening (57) is opened on the rubber sheet (56), a sealing cover plate (58) is fixedly provided at the bottom of the drain pipe (17), and a plug (59) vertically upwardly penetrating into the drain pipe (17) is fixedly provided on the sealing cover plate (58).

8. The exhaust moisture detection device for an oven according to claim 7, characterized in that: The lower end of the No. 1 cavity (51) tapers to form a No. 2 tapered groove (60), the small-diameter end of the No. 2 tapered groove (60) is connected to the through hole (53), the upper half of the No. 2 plugging pin (46) is formed with a No. 1 tapered surface (61) with the small-diameter end facing upward, and the top of the No. 2 plugging pin (46) is round-headed, and the lower half of the No. 2 plugging pin (46) is formed with a No. 2 tapered surface (62) that matches the No. 2 tapered groove (60).

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