A PCD for monitoring the sterilization effect

Abstract

The present invention discloses a PCD for monitoring the sterilization effect, belonging to the technical field of medical disinfection and sterilization. A PCD for monitoring the sterilization effect includes a PCD tube, and the PCD tube includes a reaction tube and an air guide tube communicated with the reaction tube; an indicator cabin is installed in the reaction tube; by providing a first cabin that can be movably closed by a second cabin, a pressure lifting assembly driven by the action of pressure and a first elastic member are also provided to perform linkage control with the second cabin respectively. The pressure lifting assembly can automatically respond to the change of the internal pressure of the sterilization device and drive the second cabin to communicate with the first cabin. At the same time, the first elastic member can ensure that the second cabin and the first cabin remain misaligned after sterilization is completed, so as to close the first cabin, avoiding the contact of the biological indicator after sterilization with the external environment during the process of taking it out for cultivation and ensuring the accuracy of the monitoring results.

Description

Technical Field

[0001] The present invention relates to the technical field of medical disinfection and sterilization, and particularly relates to a PCD for monitoring sterilization effect. Background Art

[0002] PCD, fully known as Process Challenge Device, that is, a sterilization process verification device, is a device specifically designed to evaluate the effectiveness of the sterilization process, which can simulate the challenges and difficulties encountered during the effective contact of the sterilization medium with the surface of a certain instrument to be sterilized.

[0003] PCD can be divided into biological PCD and chemical PCD. The core of the biological PCD is that it contains a biological indicator carrying microorganisms inside. When verifying the sterilization process, the PCD with a biological indicator inside and the instrument to be sterilized are placed in the same sterilization equipment to enter the sterilization process. The medium in the sterilization equipment enters the PCD and reacts with the biological indicator. After the reaction ends, the biological indicator is cultured. If the microorganisms carried on the biological indicator are killed, it indicates that the sterilization process has achieved the expected effect.

[0004] The defect of the existing PCD is that after sterilization, the biological indicator lacks effective airtight protection, so that the biological indicator is exposed to the environment during the process of being taken out and cultured after sterilization, contacting the external environment, resulting in the mixing of substances such as microorganisms and miscellaneous bacteria existing in the environment, affecting the results obtained from the final culture of the biological indicator, thereby leading to misjudgment of the sterilization performance of the sterilization equipment, being unable to know the true sterilization effect of the sterilization equipment, and causing the monitoring results to be distorted. Summary of the Invention

[0005] The purpose of the present invention is to provide a PCD for monitoring sterilization effect to solve the problems proposed in the above background art.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A PCD for monitoring sterilization effect, comprising:

[0008] A PCD tube, the PCD tube comprises a reaction tube and a gas guide tube communicated with the reaction tube;

[0009] An indicator chamber, installed in the reaction tube, comprising a first chamber for loading a biological indicator and a second chamber slidably sleeved outside the first chamber, and first through holes and second through holes which can be correspondingly communicated are arranged on the side walls of the first chamber and the second chamber;

[0010] A first elastic member is used to connect the first cabin and the second cabin. Under normal conditions, the first elastic member is stretched so that the first through hole and the second through hole are staggered, and the inner wall of the first elastic member fits with the outer wall of the first cabin to close the first cabin;

[0011] The pressure lifting assembly includes a movable plate, a connecting rod and a piston. The movable plate is arranged in the reaction tube and the top surface of the movable plate abuts against the bottom surface of the second cabin. The connecting rod is movably arranged in the air guide tube and the bottom is connected to the piston. The other end of the piston is sealed against the end of the air guide tube to close the PCD tube under normal pressure. The gas in the high pressure state pushes the piston upward, driving the movable plate to lift the second cabin so that the first through hole and the second through hole are aligned and connected.

[0012] The second elastic member is arranged in the reaction tube, the top end of the second elastic member abuts against the top wall in the reaction tube, and the bottom end abuts against the top surface of the movable plate, and is used to drive the movable plate to reset under normal conditions.

[0013] Furthermore, the indicator cabin also includes a mounting portion, the bottom end of the mounting portion has a mounting rod, the mounting rod is provided with a mounting hole, the interior of the mounting hole has a first internal thread, the outer wall of the top of the first cabin body has a first external thread matching the first internal thread, the first cabin body and the mounting portion are detachably connected via threads, and the mounting portion is also provided with a second sealing ring on the inner wall of the mounting hole for enhancing the sealing of the connection between the first cabin body and the mounting portion.

[0014] Furthermore, an axially extending guide slot is provided on the side wall of the first cabin body, and a guide slider matching the guide slot is provided on the inner side wall of the second cabin body to guide the second cabin body to move along the guide slot relative to the first cabin body.

[0015] Furthermore, the top of the reaction tube has an opening, the upper end of the opening is provided with an outwardly protruding connecting end, the inner wall of the connecting end is provided with a second internal thread, the outer wall of the mounting rod is provided with a second external thread matching the second internal thread, the second internal thread and the second external thread are threadedly connected, so that the indicator cabin is detachably fixedly connected to the reaction tube.

[0016] Furthermore, a first sealing ring is sleeved on the root of the external thread of the mounting rod. When the mounting rod is threadedly connected to the connecting end, the first sealing ring abuts against the top surface of the connecting end to seal the opening of the reaction tube.

[0017] Furthermore, an annular groove is provided on the bottom wall of the reaction tube, a third sealing ring is installed in the groove, the top surface of the third sealing ring protrudes from the bottom wall end surface of the reaction tube, and under normal pressure, the bottom surface of the movable plate abuts against the top surface of the third sealing ring to seal the reaction tube.

[0018] Further, the reaction tube and the gas guide tube are coaxial and integrally connected. The gas guide tube is provided with a gas guide channel communicating with the reaction tube along the axis. The connecting rod is arranged in the gas guide channel and is coaxial with the gas guide channel. The end of the gas guide tube is provided with a limiting ring radially protruding from the inner wall of the gas guide channel. An air inlet hole is provided at the center of the limiting ring. The piston at the bottom of the connecting rod abuts against the air inlet hole to close or open the air inlet hole.

[0019] Further, a clamping ring is sleeved on the outer periphery of the side wall of the piston. The diameter of the clamping ring matches the inner diameter of the gas guide channel. The clamping ring is slidably connected with the gas guide channel. A plurality of first air holes are provided on the outer periphery of the clamping ring, and the first air holes penetrate through the upper and lower end faces of the clamping ring.

[0020] Further, the end of the gas guide tube is detachably connected with a capillary assembly. One end of the gas guide channel far away from the reaction tube communicates with the capillary assembly through the air inlet hole.

[0021] Further, the capillary assembly includes a joint and a capillary hose connected to the joint. The top end of the joint has a connecting hole, and a third internal thread is provided on the inner wall of the connecting hole. A third external thread matching the third internal thread is provided on the outer wall of the end of the gas guide tube to realize the detachable connection between the capillary assembly and the gas guide tube.

[0022] Compared with the prior art, the present invention provides a PCD for monitoring the sterilization effect, which has the following beneficial effects:

[0023] By providing a first chamber that can be movably closed by a second chamber, and also providing a pressure lifting assembly driven by pressure and a first elastic member to perform linkage control with the second chamber respectively, the pressure lifting assembly can automatically respond to the change of the internal pressure of the sterilization device and drive the second chamber to communicate with the first chamber. At the same time, the first elastic member can ensure that the second chamber and the first chamber are misaligned after sterilization to close the first chamber, avoiding the contact between the biological indicator after sterilization and the external environment during the process of taking it out for cultivation and ensuring the accuracy of the monitoring result.

[0024] The present invention integrates multiple components such as a reaction tube, a gas guide tube, an indicator chamber, an elastic member, and a pressure lifting assembly, and can simulate the difficult-to-enter and semi-closed narrow cavity environment in the instrument to be sterilized, making the sterilization process closer to the extreme use conditions and meeting the monitoring requirements in complex sterilization environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional structural schematic diagram of a PCD for monitoring the sterilization effect proposed by the present invention;

[0026] Figure 2A three-dimensional structural sectional view of a PCD for monitoring the sterilization effect proposed by the present invention;

[0027] Figure 3 A structural sectional view of the indicator chamber of a PCD for monitoring the sterilization effect proposed by the present invention;

[0028] Figure 4 A three-dimensional exploded structural view of the indicator chamber of a PCD for monitoring the sterilization effect proposed by the present invention;

[0029] Figure 5 For a PCD for monitoring the sterilization effect proposed by the present invention Figure 2 A partially enlarged schematic view of the structure at position A;

[0030] Figure 6 For a PCD for monitoring the sterilization effect proposed by the present invention Figure 2 A partially enlarged schematic view of the structure at position B;

[0031] Figure 7 A three-dimensional structural view of the pressure lifting assembly of a PCD for monitoring the sterilization effect proposed by the present invention;

[0032] Figure 8 A front view of the communication state of the first through hole and the second through hole in the structure of the indicator chamber of a PCD for monitoring the sterilization effect proposed by the present invention.

[0033] In the figure: 1. Indicator chamber; 11. Installation part; 111. First internal thread; 112. Second external thread; 113. First sealing ring; 114. Second sealing ring; 12. First chamber body; 121. Guide chute; 122. First through hole; 123. First external thread; 13. Second chamber body; 131. Guide slider; 132. Second through hole; 14. First elastic member; 2. PCD tube; 21. Reaction tube; 211. Third sealing ring; 212. Second internal thread; 22. Air guide tube; 221. Third external thread; 3. Capillary assembly; 31. Connector; 311. Third internal thread; 32. Capillary hose; 4. Pressure lifting assembly; 41. Movable plate; 42. Connecting rod; 431. Clamping ring; 432. First air hole; 43. Piston; 5. Second elastic member. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Example:

[0037] like Figure 1 - Figure 8 As shown, a PCD for monitoring sterilization effect comprises:

[0038] PCD tube 2, PCD tube 2 includes a reaction tube 21 and an air guide tube 22 connected to the reaction tube 21;

[0039] The indicator chamber 1 is installed in the reaction tube 21, and includes a first chamber 12 for loading biological indicators and a second chamber 13 slidably covered on the outside of the first chamber 12. The side walls of the first chamber 12 and the second chamber 13 are provided with a first through hole 122 and a second through hole 132 that can be connected to each other.

[0040] The first elastic member 14 is used to connect the first cabin 12 and the second cabin 13. Under normal conditions, the first elastic member 14 is stretched to stagger the first through hole 122 and the second through hole 132, and the inner wall of the first elastic member 14 fits the outer wall of the first cabin 12 to seal the first cabin 12;

[0041] The pressure lifting assembly 4 includes a movable plate 41, a connecting rod 42 and a piston 43. The movable plate 41 is arranged in the reaction tube 21 and the top surface of the movable plate 41 abuts against the bottom surface of the second cabin 13. The connecting rod 42 is movably arranged in the air guide tube 22 and the bottom is connected to the piston 43. The other end of the piston 43 abuts against the end of the air guide tube 22 in a sealed manner, and the PCD tube 2 is sealed under normal pressure. The gas in the high pressure state pushes the piston 43 upward, driving the movable plate 41 to lift the second cabin 13 so that the first through hole 122 and the second through hole 132 are aligned and connected;

[0042] The second elastic member 5 is disposed in the reaction tube 21, the top end of the second elastic member 5 abuts against the top wall of the reaction tube 21, and the bottom end abuts against the top surface of the movable plate 41, and is used to drive the movable plate 41 to reset in a normal state;

[0043] During use, the biological indicator is placed in the first cabin 12 within the indicator cabin 1. The first cabin 12 and the second cabin 13 are connected by a first elastic member 14. The first elastic member 14 is an elastic rubber sleeve fittingly arranged on the outer wall of the first cabin 12. Under normal conditions, the first elastic member 14 is in a stretched state, causing the first through hole 122 on the first cabin 12 and the second through hole 132 on the second cabin 13 to be staggered from each other, and the inner wall of the first elastic member 14 fits the first cabin 12, making the first cabin 12 in a closed state to prevent the biological indicator from contacting the outside world.

[0044] As Figure 3 , Figure 4 shown, the indicator cabin 1 further includes a mounting part 11. The bottom end of the mounting part 11 has a mounting rod, and a mounting hole is provided on the mounting rod. The interior of the mounting hole has a first internal thread 111. The outer wall at the top of the first cabin 12 has a first external thread 123 matching the first internal thread 111. The first cabin 12 and the mounting part 11 are detachably connected by threads. A second sealing ring 114 is further provided on the inner wall of the mounting hole of the mounting part 11 to enhance the connection sealing performance between the first cabin 12 and the mounting part 11;

[0045] During use, the biological indicator is placed into the first cabin 12 from the top end by disassembling the mounting part 11.

[0046] As Figure 3 , Figure 4 shown, an axially extending guiding chute 121 is provided on the side wall of the first cabin 12, and a guiding slider 131 matching the guiding chute 121 is provided on the inner side wall of the second cabin 13 to guide the second cabin 13 to move relative to the first cabin 12 along the guiding chute 121;

[0047] During use, the second cabin 13 moves under the guidance of the guiding slider 131 in the guiding chute to prevent deviation when the first through hole 122 and the second through hole 132 are aligned and communicated.

[0048] As Figure 2 , Figure 5 shown, the top end of the reaction tube 21 has an opening. An outwardly protruding connecting end is provided at the upper end of the opening. A second internal thread 212 is provided on the inner wall of the connecting end. A second external thread 112 matching the second internal thread 212 is provided on the outer wall of the mounting rod. The second internal thread 212 and the second external thread 112 are threadedly connected to detachably fix the indicator cabin 1 to the reaction tube 21.

[0049] As Figure 5 shown, a first sealing ring 113 is also sleeved on the root of the external thread of the mounting rod. When the mounting rod is threadedly connected to the connecting end, the first sealing ring 113 abuts against the top surface of the connecting end to seal the opening of the reaction tube 21.

[0050] AsFigure 2 As shown, an annular groove is provided on the bottom wall of the reaction tube 21, and a third sealing ring 211 is installed in the groove. The top surface of the third sealing ring 211 protrudes from the end surface of the bottom wall of the reaction tube 21. Under normal pressure, the bottom surface of the movable plate 41 abuts against the top surface of the third sealing ring 211 to seal the reaction tube 21.

[0051] As Figure 2 shown, the reaction tube 21 and the gas guide tube 22 are coaxial and integrally connected. The gas guide tube 22 is provided with a gas guide channel communicating with the reaction tube 21 along the axis. The connecting rod 42 is arranged in the gas guide channel and is coaxial with the gas guide channel. The end of the gas guide tube 22 is provided with a limiting ring protruding radially from the inner wall of the gas guide channel. An air inlet hole is provided at the center of the limiting ring. The piston 43 at the bottom of the connecting rod 42 abuts against the air inlet hole to close or open the air inlet hole.

[0052] As Figure 2 、 Figure 6 、 Figure 7 shown, a clamping ring 431 is sleeved on the outer periphery of the side wall of the piston 43. The diameter of the clamping ring 431 matches the inner diameter of the gas guide channel. The clamping ring 431 is slidably connected with the gas guide channel, and a plurality of first air holes 432 are provided on the outer periphery of the clamping ring 431. The first air holes 432 penetrate through the upper and lower end faces of the clamping ring 431.

[0053] As Figure 2 shown, the end of the gas guide tube 22 is detachably connected with a capillary assembly 3. One end of the gas guide channel far from the reaction tube 21 communicates with the capillary assembly 3 through the air inlet hole;

[0054] During use, it is used to simulate the difficult-to-enter and semi-closed narrow cavity environment in the instrument to be sterilized.

[0055] As Figure 6 shown, the capillary assembly 3 includes a joint 31 and a capillary hose 32 connected to the joint 31. The top end of the joint 31 has a connection hole, and a third internal thread 311 is provided on the inner wall of the connection hole. A third external thread 221 matching the third internal thread 311 is provided on the outer wall of the end of the gas guide tube 22 to realize the detachable connection between the capillary assembly 3 and the gas guide tube 22.

[0056] When in use, the PCD is placed in the sterilization equipment together with the instrument to be sterilized. At this time, the second elastic member 5 in the reaction tube 21 is in an extended state under normal pressure, and its lower end abuts against the movable plate 41, so that the movable plate 41 pushes the piston 43 through the connecting rod 42 to abut against the air inlet hole on the limit ring at the end of the air guide tube 22 under normal conditions, thereby closing the air guide channel of the PCD tube 2. During the sterilization process, the sterilization equipment is pressurized so that the sterilizing gas can enter the gaps and lumens of the instrument to be sterilized under pressure; as the internal pressure of the sterilization equipment gradually increases, the sterilizing gas enters the PCD through one end of the capillary hose 32 and is compressed under pressure. The piston 43 is pushed upward by the downward force, and the seal between the piston 43 and the air inlet is broken, so that the sterilizing gas flows through the first air hole 432 on the clamping ring 431 and flows to the reaction tube 21 along the air guide channel. When the piston 43 moves upward, it is pushed by the connecting rod 42 to make the movable plate 41 move upward synchronously to compress the second elastic member 5 and lift the second cabin 13 upward. The second cabin 13 moves upward so that the first elastic member 14 is compressed by force. Under the further action of the pressure, the sterilizing gas pushes the movable plate 41 to gradually rise and lift the second cabin 13 to slide upward, so that the first through hole 122 and the second through hole 132 are gradually aligned and connected, so that the sterilizing gas can After the sterilization is completed, as the internal pressure of the sterilization equipment decreases, the second elastic member 5 starts to drive the movable plate 41 to reset downward, and the piston 43 also resets downward under the combined action of the gas pressure reduction and the first elastic member 14, and the air inlet hole of the air guide channel is reclosed. The first elastic member 14 is no longer subjected to the force that compresses it, and then pushes the second cabin 13 downward, so that the first through hole 122 and the second through hole 132 are staggered again, and the first cabin 12 is closed by the stretched first elastic member 14, thereby preventing the sterilized biological indicator from being removed. During the cultivation process, it comes into contact with the external environment, resulting in the mixing of microorganisms existing in the environment, which affects the final evaluation and judgment of the sterilization performance of the sterilization equipment; after the first cabin 12 is closed, a small amount of sterilization gas remains inside it to continue to react with the biological indicator, simulating the diffusion, penetration and reaction of the sterilization gas with the biological indicator under the complex narrow cavity, blind hole and other environmental conditions in the instrument to be sterilized. The whole process is crucial to verifying the effect of the sterilization equipment, and can reflect whether the sterilization gas can effectively penetrate into every corner of the instrument to be sterilized to kill potential microorganisms under complex and harsh conditions.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PCD for monitoring the sterilization effect, characterized in that, Comprising: A PCD tube (2), the PCD tube (2) comprising a reaction tube (21) and a gas guide tube (22) communicating with the reaction tube (21); An indicator chamber (1), installed inside the reaction tube (21), comprising a first chamber body (12) for loading a biological indicator and a second chamber body (13) slidably sleeved outside the first chamber body (12), and first through holes (122) and second through holes (132) which can be correspondingly communicated are arranged on the side wall of the first chamber body (12) and the side wall of the second chamber body (13); A first elastic member (14) for connecting the first chamber body (12) and the second chamber body (13), in a normal state, the first elastic member (14) is stretched to stagger the first through hole (122) and the second through hole (132), and the inner wall of the first elastic member (14) is attached to the outer wall of the first chamber body (12) to seal the first chamber body (12); A pressure lifting assembly (4), comprising a movable plate (41), a connecting rod (42) and a piston (43), the movable plate (41) is arranged inside the reaction tube (21) and the top surface of the movable plate (41) abuts against the bottom surface of the second chamber body (13), the connecting rod (42) is movably arranged inside the gas guide tube (22) and the bottom is connected to the piston (43), and the other end of the piston (43) is hermetically abutted against the end port of the gas guide tube (22) to seal the PCD tube (2) under normal pressure; under a high-pressure state, the gas pushes the piston (43) to move upward, driving the movable plate (41) to lift the second chamber body (13) to align and communicate the first through hole (122) and the second through hole (132); A second elastic member (5) is arranged inside the reaction tube (21), the top end of the second elastic member (5) abuts against the inner top wall of the reaction tube (21), and the bottom end abuts against the top surface of the movable plate (41) for driving the movable plate (41) to reset in a normal state; A guiding chute (121) extending axially is arranged on the side wall of the first chamber body (12), and a guiding slider (131) matching with the guiding chute (121) is arranged on the inner side wall of the second chamber body (13) to guide the second chamber body (13) to move relative to the first chamber body (12) along the guiding chute (121).

2. The PCD for monitoring the sterilization effect according to claim 1, wherein The indicator chamber (1) further comprises a mounting portion (11), the bottom end of the mounting portion (11) has a mounting rod, a mounting hole is arranged on the mounting rod, a first internal thread (111) is arranged inside the mounting hole, an outer wall at the top of the first chamber body (12) has a first external thread (123) matching with the first internal thread (111), the first chamber body (12) and the mounting portion (11) are detachably connected by threads, and a second sealing ring (114) is further arranged on the inner wall of the mounting portion (11) at the mounting hole for enhancing the connection sealing performance between the first chamber body (12) and the mounting portion (11).

3. The PCD for monitoring the sterilization effect according to claim 2, wherein, The top end of the reaction tube (21) has an opening, and an outwardly protruding connecting end is provided at the upper end of the opening. A second internal thread (212) is provided on the inner wall of the connecting end. A second external thread (112) matching the second internal thread (212) is provided on the outer wall of the mounting rod. The second internal thread (212) and the second external thread (112) are threadedly connected, so that the indicator cabin (1) is detachably fixedly connected to the reaction tube (21).

4. The PCD for monitoring the sterilization effect according to claim 3, wherein A first sealing ring (113) is also sleeved on the root of the external thread of the mounting rod. When the mounting rod is threadedly connected to the connecting end, the first sealing ring (113) abuts against the top surface of the connecting end to seal the opening of the reaction tube (21).

5. The PCD for monitoring the sterilization effect according to claim 4, characterized in that, An annular groove is provided on the bottom wall of the reaction tube (21), and a third sealing ring (211) is installed in the groove. The top surface of the third sealing ring (211) protrudes from the bottom wall end surface of the reaction tube (21). Under normal pressure, the bottom surface of the movable plate (41) abuts against the top surface of the third sealing ring (211) to seal the reaction tube (21).

6. The PCD for monitoring the sterilization effect according to claim 1, characterized in that, The reaction tube (21) is coaxially and integrally connected to the air guide tube (22). The air guide tube (22) is provided with an air guide channel communicating with the reaction tube (21) along the axis. The connecting rod (42) is arranged in the air guide channel and is coaxial with the air guide channel. A limiting ring protruding radially from the inner wall of the air guide channel is provided at the end of the air guide tube (22). An air inlet hole is provided at the center of the limiting ring. The piston (43) at the bottom of the connecting rod (42) abuts against the air inlet hole to close or open the air inlet hole.

7. The PCD for monitoring the sterilization effect according to claim 6, wherein A clamping ring (431) is sleeved on the outer periphery of the side wall of the piston (43). The diameter of the clamping ring (431) matches the inner diameter of the air guide channel. The clamping ring (431) is slidably connected to the air guide channel, and a plurality of first air holes (432) are provided on the outer periphery of the clamping ring (431). The first air holes (432) penetrate through the upper and lower end surfaces of the clamping ring (431).

8. The PCD for monitoring the sterilization effect according to claim 7, wherein, The capillary assembly (3) is detachably connected to the end of the air guide tube (22). One end of the air guide channel away from the reaction tube (21) communicates with the capillary assembly (3) through the air inlet hole.

9. The PCD for monitoring the sterilization effect according to claim 8, characterized in that, The capillary assembly (3) includes a connector (31) and a capillary hose (32) connected to the connector (31). The top end of the connector (31) has a connection hole. A third internal thread (311) is provided on the inner wall of the connection hole. A third external thread (221) matching the third internal thread (311) is provided on the outer wall of the end of the air guide tube (22) to realize the detachable connection between the capillary assembly (3) and the air guide tube (22).

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