A concentration detection device for refrigerant content in a closed space

Abstract

The present invention belongs to the field of gas concentration detection, and specifically discloses a concentration detection device for the refrigerant content in a closed space, including an adaptive closed connection mechanism, an invasive gas monitoring mechanism, a flow monitoring mechanism, and a connection display mechanism, wherein the invasive gas monitoring mechanism is arranged on the adaptive closed connection mechanism, the flow monitoring mechanism is arranged in the invasive gas monitoring mechanism, and the connection display mechanism is arranged on the invasive gas monitoring mechanism. The present invention can discharge the gas between the opening and closing baffle and the sealing block before the critical state of the opening and closing baffle is opened, thereby avoiding the exchange of the refrigerant with the external air. In addition, the present invention also has double insurance, and can perform concentration detection when the connection is fully sealed and the internal refrigerant flows smoothly.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas concentration detection, and specifically refers to a concentration detection device for refrigerant content in a closed space. Background Art

[0002] Refrigerant concentration measurement is a very important task in refrigeration systems, air-conditioning systems and refrigeration equipment. Accurately measuring refrigerant concentration can ensure the normal operation and safety of the system.

[0003] If the concentration is too low, the cooling effect of the air conditioner will be reduced; if the concentration is too high (this condition generally does not exist in air conditioners), the air conditioner will consume more electricity when working, resulting in increased energy consumption; at the same time, it will also reduce the cooling effect of the air conditioner, making it difficult to lower the indoor temperature, increasing the discomfort felt by the human body.

[0004] The infrared absorption method is to emit a certain amount of light through the built-in light source of the sensor. The refrigerant gas entering the sensor is irradiated by the light. The refrigerant has the characteristic of absorbing light of a specific wavelength. The photosensitive element can detect the light that is attenuated due to absorption, and the concentration of the refrigerant gas is calculated based on the degree of light attenuation.

[0005] Currently, there are two types of refrigerant concentration detection: fixed and handheld. Fixed detection instruments are always installed on the equipment and can only detect the refrigerant concentration at one location. Handheld instruments generally only use soft probes on the outside of the refrigeration pipe to detect whether there is a refrigerant leak, and then identify the refrigerant content inside the system. These two technical solutions cannot accurately measure the internal concentration of household air conditioners that do not require long-term detection. Summary of the invention

[0006] In view of the above situation, if you want to extend the external sensor into the interior of the refrigerant pipeline, it will generally cause partial leakage of the refrigerant. Therefore, the present invention focuses on proposing a connection device that can prevent the refrigerant from leaking; it can discharge the gas between the opening and closing baffle and the sealing block before the opening and closing baffle is in the critical state; not only that, the present invention also has double insurance, and can perform concentration detection when the connection is fully sealed and the internal refrigerant flows smoothly;

[0007] The technical solution adopted by the present invention is as follows: The present invention proposes a concentration detection device for refrigerant content in a closed space, including an adaptive closed connection mechanism, an invasive gas monitoring mechanism, a flow monitoring mechanism and a connection display mechanism, the invasive gas monitoring mechanism is arranged on the adaptive closed connection mechanism, the flow monitoring mechanism is arranged in the invasive gas monitoring mechanism, and the connection display mechanism is arranged on the invasive gas monitoring mechanism; the adaptive closed connection mechanism includes a three-way joint and an adaptive closing component, the three-way joint is composed of a flow part and a joint part, and the adaptive closing component is fixedly connected to the inside of the joint part.

[0008] Furthermore, the pre-tightening extrusion assembly includes a sealing block and an exhaust pipe. Through the hole design on the sealing block and the exhaust pipe, external air can be prevented from entering the pipeline to be tested when the device is installed, and refrigerant leakage inside the pipeline to be tested can be prevented when the device is dismantled.

[0009] Furthermore, the adaptive closing component includes a fixed retaining ring, an opening and closing baffle and a closing spring, the fixed retaining ring is fixed to the bottom of the joint part, the opening and closing baffle is provided with a baffle edge, and the closing spring is arranged between the fixed retaining ring and the baffle edge.

[0010] Furthermore, the invasive gas monitoring mechanism comprises a threaded lifting assembly and a pre-tightening extrusion assembly, wherein the threaded lifting assembly is arranged in the joint portion, and the pre-tightening extrusion assembly is located in the threaded lifting assembly.

[0011] Preferably, the threaded lifting assembly includes a threaded sleeve, a tightening nut and an instrument base, the threaded sleeve is fixedly connected to the interior of the joint part, the top of the threaded sleeve is provided with an internal thread matching the tightening nut, the tightening nut is provided with a handle part, the tightening nut is provided with a guide ring inside, the instrument base is provided with a guide groove matching the guide ring, and the instrument base and the tightening nut can rotate relative to each other.

[0012] As a further preferred embodiment of the present invention, the pre-tightening extrusion assembly also includes a pre-stressing spring, the sealing block is slidably arranged in the threaded sleeve, the pre-stressing spring is arranged between the threaded sleeve and the sealing block, the bottom of the sealing block is provided with a sloped notch portion matching the fixed retaining ring, the sealing block is symmetrically provided with through circular through holes and square through holes, the middle position of the sealing block is also provided with a through center through hole, the end of the center through hole is provided with a tapered mouth, the exhaust pipe is fixedly connected to the instrument base, the exhaust pipe is snap-fitted and slidably arranged in the circular through hole, and the exhaust pipe is provided with an exhaust hole.

[0013] Furthermore, the flow monitoring mechanism includes an infrared attenuation detection component, a flow monitoring wheel component and a dual detection component, the infrared attenuation detection component is slidably arranged in the pre-tightening extrusion component, the flow monitoring wheel component is arranged in the pre-tightening extrusion component, and the dual detection component is arranged in the flow monitoring wheel assembly.

[0014] Preferably, the infrared attenuation detection component includes a light generator and a light receiver, the light generator and the light receiver are fixedly connected to the bottom of the instrument base, the light generator and the light receiver are snap-fitted and slidably arranged in a square through hole, the light generator and the light receiver are arranged relative to each other, and the infrared light emitted from the light generator can be received by the light receiver.

[0015] As a further preferred embodiment of the present invention, the flow monitoring wheel assembly includes a double-layer hollow top rod, a hollow induction shaft, a reset spring and elastic inclined blades, the double-layer hollow top rod is fixedly connected to the bottom of the instrument base, the double-layer hollow top rod is provided with a partition portion, the partition portion is provided with a square sliding hole, the hollow induction shaft can slide and rotate in the central through hole, one end of the hollow induction shaft is provided with a shaft flange portion, and the reset spring is arranged between the shaft flange portion and the sealing block.

[0016] Preferably, a countersunk groove is provided in the middle of the hollow induction shaft, a conical portion is provided at the bottom of the hollow induction shaft, and fan blade slots are evenly distributed in an annular shape on the conical portion. One end of the elastic inclined blade is fixedly connected to the fan blade slot, and the elastic inclined blade can be integrally engaged in the fan blade slot when squeezed.

[0017] As a further preferred embodiment of the present invention, the dual detection component includes a swinging screw, an elastic pull rope and a contact switch. The elastic pull rope is arranged between the bottom of the countersunk groove and the swinging screw. The countersunk groove is provided with a threaded groove that cooperates with the swinging screw. The threaded cooperation between the swinging screw and the countersunk groove cannot be self-locking. Therefore, the rotation of the hollow induction shaft can control the extension of the swinging screw. When the hollow induction shaft does not rotate, the swinging screw can also be retracted and reset by the elastic pull rope. A square shaft portion is provided on the swinging screw, and the square shaft portion is snap-fitted and slidably arranged in a square sliding hole. The contact switch is respectively arranged at the top of the square shaft portion and the bottom of the double-layer hollow top rod.

[0018] Furthermore, the connection display mechanism includes an instrument body, an audible and visual warning light, and a data transmission line. The instrument body is arranged on an instrument base, the audible and visual warning light is arranged on one side of the instrument body, and the data transmission line is arranged on the other side of the instrument body.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows:

[0020] (1) Through the automatic closing of the opening and closing baffle, it can automatically open when the detection device is connected, so that the probe can penetrate into the three-way joint, and automatically close when the detection device is pulled out, thereby preventing the refrigerant inside the pipeline from leaking when the internal and external air pass through. Unlike the traditional automatic closing joint, this solution not only does not have the time when the internal and external air pass through, but also can first evacuate the gas between the opening and closing baffle and the sealing block at the critical state of opening and closing, thereby preventing the entry of outside air or the discharge of refrigerant to the greatest extent.

[0021] (2) By manually rotating the handle, the screw-in depth of the tightening nut can be adjusted, thereby controlling the extension and retraction of the components in the flow monitoring mechanism. At the same time, since the instrument base can be rotated relative to the threaded sleeve, the angle of the flow monitoring mechanism can be adjusted without changing the penetration depth of the threaded sleeve by rotating the display mechanism and the instrument base.

[0022] (3) Through the close fit between the sealing block and the fixed retaining ring, the air between the opening and closing baffle and the sealing block can be discharged through the exhaust pipe before the opening and closing baffle is opened, and no air will be retained, thereby preventing outside air from entering the interior of the pipeline.

[0023] (4) After the sealing block is stationary, the exhaust pipe, the light generator and the light receiver will extend and push the opening and closing baffle open. At this time, the end of the exhaust pipe is blocked by the opening and closing baffle, and the air inside and outside will not be exchanged. The light generator and the light receiver enter the test environment where the refrigerant exists.

[0024] (5) The relative position between the light generator and the light receiver is fixed, and infrared light of a specific wavelength will be absorbed by the refrigerant. Therefore, the refrigerant concentration in the test environment can be known through the infrared intensity feedback received by the light receiver.

[0025] (6) After the light generator and the light receiver extend to a certain extent, the double-layer hollow push rod will contact and push out the hollow sensing shaft. Therefore, the spatial positions of the hollow sensing shaft and the infrared attenuation detection component are staggered and will not affect the light transmission.

[0026] (7) The size and installation position of the elastic tilted blades match the fan blade slots. When the hollow induction shaft retracts, the elastic tilted blades are completely attached to the fan blade slots in the extrusion bracket and fill the fan blade slots. At this time, the hollow induction shaft and the elastic tilted blades as a whole can fill the central through hole and the tapered mouth to avoid air retention; when the hollow induction shaft is extended, the elastic tilted blades can open to a certain angle under the action of their own elastic force. Since all the elastic tilted blades are tilted in one direction, no matter how the refrigerant flows, the hollow induction shaft will only rotate in one direction.

[0027] (8) The swinging screw and the countersunk groove are spirally driven, so they can be extended when the hollow sensing shaft rotates. The present invention has double insurance: first, the infrared attenuation detection component is controlled to extend by rotating and tightening the nut. When the double-layer hollow push rod pushes the hollow sensing shaft out, it is the first verification. At this time, on the one hand, it can ensure that the infrared attenuation detection component and the hollow sensing shaft are in place. On the other hand, it also ensures that the pre-load spring has sufficient extrusion force, thereby ensuring the sealing between the sealing block and the fixed retaining ring; the swinging screw will not be fully extended until the rotation speed of the hollow sensing shaft reaches a certain level. This is the second verification. At this time, it indicates that the gas flow rate in the circulation part is normal and there is no blockage. The above two verifications are the basic conditions for whether the entire measurement is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional diagram of a concentration detection device for refrigerant content in a closed space proposed by the present invention;

[0029] Figure 2 This is a front view of a concentration detection device for refrigerant content in a closed space proposed by the present invention;

[0030] Figure 3 It is a left view of a concentration detection device for refrigerant content in a closed space proposed by the present invention;

[0031] Figure 4 A top view of a concentration detection device for refrigerant content in a closed space proposed by the present invention;

[0032] Figure 5 for Figure 2 A cross-sectional view along the cutting line AA;

[0033] Figure 6 for Figure 3 A cross-sectional view along the cutting line BB;

[0034] Figure 7 for Figure 5 A cross-sectional view along the cutting line CC;

[0035] Figure 8 It is a partially exploded schematic diagram of a concentration detection device for refrigerant content in a closed space proposed by the present invention;

[0036] Fig. 9 for Figure 5 A partial enlarged view of point Ⅰ in the middle;

[0037] Fig.10 for Figure 6 A partial enlarged view of the middle II;

[0038] Fig.11 for Figure 7 A partial enlarged view of the middle part III;

[0039] Fig.12 for Figure 8 A partial enlarged view of point IV in the middle.

[0040] Among them, 1. Adaptive closed connection mechanism, 2. Invasive gas monitoring mechanism, 3. Flow monitoring mechanism, 4. Connection display mechanism, 5. Three-way joint, 6. Adaptive closing component, 7. Flow part, 8. Joint part, 9. Fixed retaining ring, 10. Open and close baffle, 11. Closing spring, 12. Baffle edge, 13. Threaded lifting component, 14. Pre-tightening extrusion component, 15. Threaded sleeve, 16. Tightening nut, 17. Instrument base, 18. Pre-stressed spring, 19. Sealing block, 20. Exhaust pipe, 21. Guide ring, 22. Handle part, 23. Guide groove, 24. Slope notch, 25. Circular through hole, 26. Square through hole hole, 27, center through hole, 28, tapered mouth, 29, exhaust hole, 30, infrared attenuation detection component, 31, flow monitoring wheel component, 32, double detection component, 33, light generator, 34, light receiver, 35, double-layer hollow top rod, 36, hollow sensing shaft, 37, reset spring, 38, elastic tilting blade, 39, swing screw, 40, elastic pull rope, 41, contact switch, 42, partition part, 43, square slide hole, 44, shaft flange part, 45, countersunk groove part, 46, tapered part, 47, fan blade slot, 48, square shaft part, 49, instrument body, 50, sound and light warning light, 51, data transmission line.

[0041] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0044] like Figure 1 to Figure 12As shown, the present invention proposes a concentration detection device for the refrigerant content in a closed space, including an adaptive closed connecting mechanism 1, an invasive gas monitoring mechanism 2, a flow monitoring mechanism 3 and a connection display mechanism 4, the invasive gas monitoring mechanism 2 is arranged on the adaptive closed connecting mechanism 1, the flow monitoring mechanism 3 is arranged in the invasive gas monitoring mechanism 2, and the connection display mechanism 4 is arranged on the invasive gas monitoring mechanism 2; the adaptive closed connecting mechanism 1 includes a three-way joint 5 and an adaptive closed component 6, the three-way joint 5 is composed of a flow portion 7 and a joint portion 8, and the adaptive closed component 6 is fixedly connected to the inside of the joint portion 8.

[0045] The adaptive closing component 6 includes a fixed retaining ring 9, an opening and closing baffle 10 and a closing spring 11. The fixed retaining ring 9 is fixedly connected to the bottom of the joint portion 8. The opening and closing baffle 10 is provided with a baffle edge portion 12. The closing spring 11 is arranged between the fixed retaining ring 9 and the baffle edge portion 12.

[0046] Through the automatic closing of the opening and closing baffle 10, it can automatically open when the detection device is connected, so that the probe can penetrate into the three-way joint 5, and automatically close when the detection device is pulled out, thereby avoiding the leakage of refrigerant inside the pipeline when the internal and external air pass through. Unlike the traditional automatic closing joint, this solution not only does not require the time for the internal and external air to pass through, but also can first evacuate the gas between the opening and closing baffle 10 and the sealing block 19 at the critical state of opening and closing, thereby avoiding the entry of outside air or the discharge of refrigerant to the greatest extent.

[0047] The intrusive gas monitoring mechanism 2 comprises a threaded lifting assembly 13 and a pre-tightening and squeezing assembly 14 . The threaded lifting assembly 13 is arranged in the joint portion 8 , and the pre-tightening and squeezing assembly 14 is located in the threaded lifting assembly 13 .

[0048] The threaded lifting assembly 13 includes a threaded sleeve 15, a tightening nut 16 and an instrument base 17. The threaded sleeve 15 is fixedly connected to the inside of the joint part 8. The top of the threaded sleeve 15 is provided with an internal thread that matches the tightening nut 16. The tightening nut 16 is provided with a handle part 22. The inside of the tightening nut 16 is provided with a guide ring 21. The instrument base 17 is provided with a guide groove 23 that matches the guide ring 21. The instrument base 17 and the tightening nut 16 can rotate relative to each other.

[0049] By manually rotating the handle portion 22, the screwing depth of the tightening nut 16 can be adjusted, thereby controlling the extension and retraction of the components in the flow monitoring mechanism 3. At the same time, since the instrument base 17 can rotate relative to the threaded sleeve 15, the angle of the flow monitoring mechanism 3 can be adjusted without changing the penetration depth of the threaded sleeve 15 by rotating the display mechanism 4 and the instrument base 17.

[0050] The preload extrusion assembly 14 includes a preload spring 18, a sealing block 19 and an exhaust pipe 20. The sealing block 19 is slidably arranged in the threaded sleeve 15. The preload spring 18 is arranged between the threaded sleeve 15 and the sealing block 19. The bottom of the sealing block 19 is provided with a sloped notch portion 24 matching the fixed retaining ring 9. The sealing block 19 is symmetrically provided with a through circular through hole 25 and a square through hole 26. The middle position of the sealing block 19 is also provided with a through center through hole 27. The end of the center through hole 27 is provided with a tapered mouth 28. The exhaust pipe 20 is fixedly connected to the instrument base 17. The exhaust pipe 20 is snap-fitted and slidably arranged in the circular through hole 25. The exhaust pipe 20 is provided with an exhaust hole 29.

[0051] Through the close fit between the sealing block 19 and the fixed retaining ring 9, the air between the opening and closing baffle 10 and the sealing block 19 can be discharged through the exhaust pipe 20 before the opening and closing baffle 10 is opened without being retained, thereby preventing outside air from entering the interior of the pipeline.

[0052] The connection display mechanism 4 includes an instrument body 49 , an audible and visual warning light 50 and a data transmission line 51 . The instrument body 49 is arranged on the instrument base 17 , the audible and visual warning light 50 is arranged on one side of the instrument body 49 , and the data transmission line 51 is arranged on the other side of the instrument body 49 .

[0053] The flow monitoring mechanism 3 includes an infrared attenuation detection component 30, a flow monitoring wheel component 31 and a dual detection component 32. The infrared attenuation detection component 30 is slidably arranged in the pre-tightening extrusion component 14, the flow monitoring wheel component 31 is arranged in the pre-tightening extrusion component 14, and the dual detection component 32 is arranged in the flow monitoring wheel component 31.

[0054] The infrared attenuation detection component 30 includes a light generator 33 and a light receiver 34. The light generator 33 and the light receiver 34 are fixed to the bottom of the instrument base 17. The light generator 33 and the light receiver 34 are snap-fitted and slidably arranged in the square through hole 26. The light generator 33 and the light receiver 34 are arranged relative to each other, and the infrared light emitted from the light generator 33 can be received by the light receiver 34.

[0055] After the sealing block 19 is stationary, the exhaust pipe 20, the light generator 33 and the light receiver 34 will push open the opening and closing baffle 10 when they are extended. At this time, the end of the exhaust pipe 20 is blocked by the opening and closing baffle 10, and the air inside and outside will not be exchanged. The light generator 33 and the light receiver 34 enter the test environment where the refrigerant exists.

[0056] The relative position between the light generator 33 and the light receiver 34 is fixed, and infrared rays of a specific wavelength will be absorbed by the refrigerant. Therefore, the refrigerant concentration in the test environment can be known through the infrared intensity result feedback received by the light receiver 34.

[0057] The flow monitoring wheel assembly 31 includes a double-layer hollow top rod 35, a hollow sensing shaft 36, a reset spring 37 and an elastic inclined blade 38. The double-layer hollow top rod 35 is fixedly connected to the bottom of the instrument base 17. The double-layer hollow top rod 35 is provided with a partition portion 42. The partition portion 42 is provided with a square sliding hole 43. The hollow sensing shaft 36 can slide and rotate in the central through hole 27. One end of the hollow sensing shaft 36 is provided with a shaft flange portion 44. The reset spring 37 is arranged between the shaft flange portion 44 and the sealing block 19.

[0058] After the light generator 33 and the light receiver 34 extend to a certain extent, the double-layer hollow push rod 35 will contact and push out the hollow sensing shaft 36, so the spatial positions of the hollow sensing shaft 36 and the infrared attenuation detection component 30 are staggered and will not affect the light transmission.

[0059] A countersunk groove 45 is provided in the middle of the hollow induction shaft 36, and a conical portion 46 is provided at the bottom of the hollow induction shaft 36. Fan blade slots 47 are evenly distributed in an annular shape on the conical portion 46. One end of the elastic inclined blade 38 is fixedly connected to the fan blade slot 47. The elastic inclined blade 38 can be integrally engaged in the fan blade slot 47 when squeezed.

[0060] The size and installation position of the elastic inclined blades 38 match the fan blade slots 47. When the hollow induction shaft 36 retracts, the elastic inclined blades 38 are completely attached to the fan blade slots 47 in the extrusion bracket and fill the fan blade slots 47. At this time, the hollow induction shaft 36 and the elastic inclined blades 38 as a whole can fill the central through hole 27 and the tapered mouth 28 to avoid the retention of air; when the hollow induction shaft 36 is extended, the elastic inclined blades 38 can open a certain angle under the action of their own elastic force. Since all the elastic inclined blades 38 are inclined in one direction, no matter how the refrigerant flows, the hollow induction shaft 36 will only rotate in one direction.

[0061] The double detection component 32 includes a swinging screw 39, an elastic pull rope 40 and a contact switch 41. The elastic pull rope 40 is arranged between the bottom of the countersunk groove 45 and the swinging screw 39. The countersunk groove 45 is provided with a threaded groove that cooperates with the swinging screw 39. The threaded cooperation between the swinging screw 39 and the countersunk groove 45 cannot be self-locking. Therefore, the rotation of the hollow sensing shaft 36 can control the extension of the swinging screw 39. When the hollow sensing shaft 36 does not rotate, the elastic pull rope 40 can also be used to retract and reset the swinging screw 39. A square shaft portion 48 is provided on the swinging screw 39, and the square shaft portion 48 is engaged and slidably arranged in the square sliding hole 43. The contact switch 41 is respectively arranged at the top of the square shaft portion 48 and the bottom of the double-layer hollow top rod 35.

[0062] The swinging screw 39 and the countersunk groove 45 are spirally driven, so they can be extended when the hollow sensing shaft 36 rotates. The present invention has double insurance: first, the infrared attenuation detection component 30 is controlled to be extended by rotating and tightening the nut 16. When the double-layer hollow push rod 35 pushes out the hollow sensing shaft 36, it is the first verification. At this time, on the one hand, it can ensure that the infrared attenuation detection component 30 and the hollow sensing shaft 36 are both in place, and on the other hand, it also ensures that the pre-load spring 18 has sufficient extrusion force, thereby ensuring the sealing between the sealing block 19 and the fixed retaining ring 9; the rotation speed of the hollow sensing shaft 36 reaches a certain level before the swinging screw 39 is fully extended. This is the second verification. At this time, it indicates that the gas flow rate in the circulation part 7 is normal and there is no blockage. The above two verifications are the basic conditions for whether the entire measurement is accurate.

[0063] When in use, the user first needs to remove the plastic cover originally used for external sealing from the joint part 8, and then insert the sealing block 19 into the threaded sleeve 15, and then rotate the tightening nut 16 to make the tightening nut 16 enter the threaded sleeve 15 by matching the threads of the tightening nut 16 and the threaded sleeve 15;

[0064] As the tightening nut 16 rotates, the sealing block 19 also continuously approaches the opening and closing baffle 10. In the initial state, the bottoms of the exhaust pipe 20, the light generator 33 and the light receiver 34 are all flush with the bottom surface of the sealing block 19. Therefore, when the sealing block 19 approaches the opening and closing baffle 10, the air between the sealing block 19 and the opening and closing baffle 10 will be discharged through the exhaust pipe 20.

[0065] When the sealing block 19 contacts the opening and closing baffle 10, the air between the opening and closing baffle 10 and the sealing block 19 has been completely exhausted. At this time, the end opening of the exhaust pipe 20 has also been blocked by the opening and closing baffle 10. Then, the tightening nut 16 is rotated continuously, and the exhaust pipe 20, the light generator 33 and the light receiver 34 are extended from the sealing block 19 through the continued invasion of the instrument base 17. Since the external air has been exhausted before, the exhaust pipe 20, the light generator 33 and the light receiver 34 will not bring in the external air when entering the circulation part 7. At this time, since there is no obstruction between the light generator 33 and the flow monitoring mechanism 3, the refrigerant concentration can actually be measured.

[0066] The infrared light of a specific wavelength emitted by the light generator 33 will be partially absorbed by the refrigerant, and the relative positions of the light generator 33 and the light receiver 34 are fixed; therefore, the concentration of the refrigerant in the joint 8 can be known by the infrared intensity measured at the light receiver 34.

[0067] As the tightening nut 16 continues to rotate, the double-layer hollow push rod 35 will contact and overcome the elastic force of the return spring 37 to push the hollow induction shaft 36 out of the sealing block 19. After the hollow induction shaft 36 extends out of the sealing block 19, the elastic inclined blades 38 originally fitted in the fan blade slot 47 will open a certain angle under the action of the elastic force. Since all the elastic inclined blades 38 are inclined in one direction, the hollow induction shaft 36 will only rotate in one direction regardless of the flow direction of the refrigerant.

[0068] When the hollow sensing shaft 36 rotates, the swing screw 39 will slide along the square sliding hole 43, and after the contact switch 41 is contacted, the swing screw 39 and the hollow sensing shaft 36 will remain in the current position.

[0069] The contact switch 41 will only be contacted when the two conditions that the double-layer hollow top rod 35 squeezes the hollow sensing shaft 36 and the rotation speed of the hollow sensing shaft 36 reaches a certain level are met at the same time. When the contact switch 41 is contacted, the sound and light warning light 50 lights up green, indicating that data can be collected at present. A preliminary reading can be made through the display screen on the instrument body 49, and the data transmission and analysis can be carried out by connecting to a computer or other terminal through the data transmission line 51.

[0070] After the detection is completed, the device is removed by rotating the tightening nut 16 in the opposite direction. As the opening and closing baffle 10 and the sealing block 19 gradually approach each other, the refrigerant gas between the opening and closing baffle 10 and the sealing block 19 will also be squeezed into the interior of the three-way joint 5. When the opening and closing baffle 10 and the sealing block 19 are separated, the end of the exhaust pipe 20 is no longer blocked by the opening and closing baffle 10. At this time, the outside air can flow through the exhaust pipe 20.

[0071] During the entire installation and disassembly process, there is no moment when the interior of the three-way joint 5 is connected to the external environment, there is no situation where the external air originally remaining in the invasive gas monitoring mechanism 2 enters the three-way joint 5, and there is no situation where the refrigerant flows out during disassembly.

[0072] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0073] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A concentration detection device for refrigerant content in a closed space, characterized in that: The invention comprises an adaptive closed connection mechanism (1), an intrusive gas monitoring mechanism (2), a flow monitoring mechanism (3) and a connection display mechanism (4), wherein the intrusive gas monitoring mechanism (2) is arranged on the adaptive closed connection mechanism (1), the flow monitoring mechanism (3) is arranged in the intrusive gas monitoring mechanism (2), and the connection display mechanism (4) is arranged on the intrusive gas monitoring mechanism (2); The adaptive closed connection mechanism (1) comprises a three-way joint (5) and an adaptive closed component (6), wherein the three-way joint (5) is composed of a flow portion (7) and a joint portion (8), and the adaptive closed component (6) is fixedly connected to the inside of the joint portion (8); The intrusive gas monitoring mechanism (2) comprises a threaded lifting assembly (13) and a pre-tightening extrusion assembly (14); the threaded lifting assembly (13) is arranged in the joint portion (8), and the pre-tightening extrusion assembly (14) is located in the threaded lifting assembly (13); The pre-tightening extrusion assembly (14) comprises a sealing block (19) and an exhaust pipe (20). The hole design on the sealing block (19) and the exhaust pipe (20) can prevent outside air from entering the pipeline to be tested when the device is installed, and can prevent refrigerant leakage inside the pipeline to be tested when the device is dismantled. The flow monitoring mechanism (3) comprises an infrared attenuation detection component (30), a flow monitoring wheel component (31) and a dual detection component (32); the infrared attenuation detection component (30) is slidably disposed in the pre-tightening extrusion component (14); the flow monitoring wheel component (31) is disposed in the pre-tightening extrusion component (14); and the dual detection component (32) is disposed in the flow monitoring wheel component (31); The adaptive closing assembly (6) comprises a fixed retaining ring (9), an opening and closing baffle (10) and a closing spring (11); the fixed retaining ring (9) is fixedly connected to the bottom of the joint portion (8); the opening and closing baffle (10) is provided with a baffle edge portion (12); and the closing spring (11) is arranged between the fixed retaining ring (9) and the baffle edge portion (12); The threaded lifting assembly (13) comprises a threaded sleeve (15), a tightening nut (16) and an instrument base (17); the threaded sleeve (15) is fixedly connected to the inside of the joint portion (8); the top end of the threaded sleeve (15) is provided with an internal thread that matches the tightening nut (16); the tightening nut (16) is provided with a handle portion (22); the tightening nut (16) is provided with a guide ring (21) inside; the instrument base (17) is provided with a guide groove (23) that matches the guide ring (21); and the instrument base (17) and the tightening nut (16) are capable of relative rotation; The preload extrusion assembly (14) further comprises a preload spring (18), the sealing block (19) is slidably disposed in the threaded sleeve (15), the preload spring (18) is disposed between the threaded sleeve (15) and the sealing block (19), the bottom of the sealing block (19) is provided with a slope notch portion (24) matching the fixed retaining ring (9), the sealing block (19) is symmetrically provided with a through circular through hole (25) and a square through hole (26), the sealing block (19) is further provided with a through central through hole (27) at the middle position of the sealing block (19), the end of the central through hole (27) is provided with a conical opening (28), the exhaust pipe (20) is fixedly connected to the instrument base (17), the exhaust pipe (20) is slidably disposed in the circular through hole (25), and the exhaust pipe (20) is provided with an exhaust hole (29); The infrared attenuation detection component (30) comprises a light generator (33) and a light receiver (34), wherein the light generator (33) and the light receiver (34) are fixedly connected to the bottom of the instrument base (17), and the light generator (33) and the light receiver (34) are slidably engaged in the square through hole (26). The light generator (33) and the light receiver (34) are arranged relative to each other, and the infrared light emitted from the light generator (33) can be received by the light receiver (34).

2. The device for detecting the concentration of refrigerant in a closed space according to claim 1, characterized in that: The flow monitoring wheel assembly (31) comprises a double-layer hollow top rod (35), a hollow induction shaft (36), a reset spring (37) and an elastic inclined blade (38); the double-layer hollow top rod (35) is fixedly connected to the bottom of the instrument base (17); a partition portion (42) is provided on the double-layer hollow top rod (35); a square sliding hole (43) is provided on the partition portion (42); the hollow induction shaft (36) can slide and rotate in the central through hole (27); a shaft flange portion (44) is provided at one end of the hollow induction shaft (36); and the reset spring (37) is provided between the shaft flange portion (44) and the sealing stopper (19).

3. The device for detecting the concentration of refrigerant in a closed space according to claim 2, characterized in that: A countersunk groove portion (45) is provided in the middle of the hollow induction rotating shaft (36), a conical portion (46) is provided at the bottom of the hollow induction rotating shaft (36), and fan blade retaining grooves (47) are evenly distributed in an annular shape on the conical portion (46), one end of the elastic inclined blade (38) is fixedly connected to the fan blade retaining groove (47), and the elastic inclined blade (38) can be integrally engaged in the fan blade retaining groove (47) when being squeezed.

4. The device for detecting the concentration of refrigerant in a closed space according to claim 3, characterized in that: The double detection assembly (32) comprises a swinging screw (39), an elastic pull rope (40) and a contact switch (41). The elastic pull rope (40) is arranged between the bottom of the countersunk groove portion (45) and the swinging screw (39). The countersunk groove portion (45) is provided with a thread groove that cooperates with the swinging screw (39). The thread cooperation between the swinging screw (39) and the countersunk groove portion (45) cannot be self-locking. Therefore, the rotation of the hollow sensing shaft (36) can control the swinging screw (39) to extend. When the hollow sensing shaft (36) does not rotate, the swinging screw (39) can also be retracted and reset by the elastic pull rope (40). The swinging screw (39) is provided with a square shaft portion (48). The square shaft portion (48) is slidably arranged in the square sliding hole (43). The contact switch (41) is respectively arranged at the top of the square shaft portion (48) and the bottom of the double-layer hollow top rod (35).

5. The device for detecting the concentration of refrigerant in a closed space according to claim 4, characterized in that: The connection display mechanism (4) comprises an instrument body (49), an audible and visual warning light (50), and a data transmission line (51); the instrument body (49) is arranged on an instrument base (17); the audible and visual warning light (50) is arranged on one side of the instrument body (49); and the data transmission line (51) is arranged on the other side of the instrument body (49).

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