Chromatograph air tightness detection device

Abstract

The utility model relates to a gas tightness detection device for a chromatographic instrument, which comprises a lantern ring composed of a main sleeve shell and an auxiliary sleeve shell, one side of the main sleeve shell and one side of the auxiliary sleeve shell are hinged, and the other side of the main sleeve shell and the other side of the auxiliary sleeve shell are clamped through a fastener, so that the main sleeve shell and the auxiliary sleeve shell are sleeved at the pipeline joint of the chromatographic instrument; the inner walls of the main sleeve shell and the auxiliary sleeve shell are jointly provided with a mounting groove connected with a sealing air bag. The utility model relates to the technical field of chromatographic instruments. According to the gas tightness detection device for the chromatographic instrument, through the arrangement of the alarm, vibration can be generated when gas leakage occurs at the pipeline connecting position when gas flow penetrates through the notch of the baffle of the resonance cavity, so that the alarm is made to buzz, the gas leakage point position can be alarmed conveniently, and the detection precision of gas leakage of the pipeline can be effectively improved; and the gas leakage point is accurately positioned when the gas leakage of the pipeline is detected, so that the practicability of the gas tightness detection device for the chromatographic instrument is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chromatographs, in particular to an air tightness detection device for chromatographs. Background Art

[0002] A chromatograph is a device used for chromatographic separation and analysis. It includes a sampling system, a detection system, a recording and data processing system, a temperature control system, and a mobile phase control system. Modern chromatographs are characterized by stability, sensitivity, versatility, and a high degree of automation. Examples include gas chromatographs, liquid chromatographs, and gel chromatographs. These instruments are widely used to analyze chemical products and specific content in polymer materials. Gel chromatographs can also determine the molecular weight and distribution of polymer materials.

[0003] In the existing technology, a gas chromatograph is generally composed of an air path system, an injection system, a separation system, a detection and temperature control system, and a recording system. Adjacent systems are connected by pipes. As the pipes age and become damaged, their air tightness will weaken, causing air to mix into the chromatograph when in use, affecting the detection accuracy of the chromatograph. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a chromatograph air tightness detection device so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A chromatograph air tightness detection device includes a collar, which is composed of a main housing and a secondary housing. The main housing and the secondary housing are hinged on one side and clamped on the other side by a fastener, so that the main housing and the secondary housing are sleeved on the pipe connection of the chromatograph. The inner walls of the main housing and the secondary housing are both provided with a mounting groove for connecting a sealing airbag.

[0007] Sealing airbags, which are provided in two groups and are connected to the main shell and the auxiliary shell respectively;

[0008] The alarm includes a shell, which is fixedly connected to the outer edge of the main shell and has a resonance cavity in the shell;

[0009] An air inlet hole connected to the mounting groove is provided at the bottom of the resonance chamber, and a pressure valve is fixedly connected to the middle of the air inlet hole;

[0010] A baffle is fixedly connected to the middle of the inner peripheral wall of the resonance chamber, and a gap for air flow is provided between one side of the baffle and the inner peripheral wall of the resonance chamber;

[0011] An exhaust hole communicating with the resonance cavity is provided on one side of the outer side of the shell body close to the notch.

[0012] Furthermore, each group of the sealing airbags is provided with two, which are respectively fixedly connected to the left and right inner walls of the mounting groove. A gap is left between the two sealing airbags in the same group, and an extrusion part for extruding the airbag is provided in the gap.

[0013] Furthermore, the extrusion member includes a pressure plate and a spring. Two pressure plates are provided and are fixedly connected to the side walls of the two sealing airbags respectively. A spring for pushing the pressure plate is fixedly connected between the two pressure plates.

[0014] Furthermore, the sealing airbag is in a semicircular ring shape, so that when the main shell and the auxiliary shell are buckled together, the two sealing airbags on the same side form a complete ring.

[0015] Furthermore, the front and rear edges of the installation groove are both chamfered, and a sealing strip is embedded on the outer side of the chamfer.

[0016] Furthermore, the fastener includes a connecting buckle and a connecting socket, which are fixedly connected to the main shell and the auxiliary shell respectively. A slot is provided on the side of the connecting socket close to the connecting buckle, and a protrusion on the side of the connecting buckle close to the connecting socket is formed with a snap-on portion for inserting into the slot.

[0017] In summary, the present invention has at least one of the following beneficial technical effects:

[0018] 1. This chromatograph air tightness detection device, through the provision of an alarm, can generate vibrations when air flows through the notch of the baffle of the resonance chamber when a leak occurs at a pipe connection, thereby causing the alarm to sound, thereby facilitating an alarm for the leak point. This can effectively improve the accuracy of pipeline leak detection and accurately locate the leak point when a pipeline leak is detected, thereby effectively improving the practicality of the chromatograph air tightness detection device;

[0019] 2. This chromatograph air tightness detection device, through the extrusion part provided, enables the pressure plate to reduce the gap between the sealing air bag and the outer wall of the pipeline connection by squeezing the sealing air bag, thereby preventing air from leaking through the gap. It can effectively ensure the leakage detection accuracy of the chromatograph air tightness detection device when it is installed at the pipeline connection, thereby further improving the practicality of the chromatograph air tightness detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The utility model is a structural schematic diagram of a chromatograph air tightness detection device.

[0022] Figure 2 The utility model is a schematic diagram of the internal structure of a chromatograph air tightness detection device.

[0023] Figure 3 This is a structural schematic diagram of a chromatograph air tightness detection device of the utility model when it is opened.

[0024] Figure 4 The utility model is a schematic diagram of the internal structure of an alarm in a chromatograph air tightness detection device.

[0025] Figure 5 The utility model is a structural schematic diagram of a chromatograph air tightness detection device when it is sleeved on a pipeline connection.

[0026] In the figure, 1. ring; 11. main shell; 12. auxiliary shell; 2. sealing airbag; 3. alarm; 31. shell; 32. baffle; 33. pressure valve; 34. resonance chamber; 35. air inlet; 36. notch; 37. exhaust hole; 4. fastener; 41. connecting buckle; 42. connecting socket; 5. mounting groove; 6. extrusion piece; 61. pressure plate; 62. spring; 7. sealing strip; 8. slot; 9. connecting part. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings.

[0028] Example:

[0029] Reference Figure 1 - Figure 5 The utility model discloses a gas tightness detection device for a chromatograph, comprising a collar 1, which is composed of a main housing 11 and a secondary housing 12. The main housing 11 and the secondary housing 12 are hinged on one side and clamped on the other side by a fastener 4, so that the main housing 11 and the secondary housing 12 are sleeved on the pipe connection of the chromatograph. The inner walls of the main housing 11 and the secondary housing 12 are jointly provided with a mounting groove 5 for connecting a sealing airbag 2.

[0030] Sealing airbags 2, which are provided in two groups and are connected to the main housing 11 and the auxiliary housing 12 respectively;

[0031] The alarm 3 includes a housing 31 fixedly connected to the outer edge of the main housing 11, and a resonance chamber 34 is defined in the housing 31;

[0032] An air inlet 35 communicating with the mounting slot 5 is provided at the bottom of the resonance chamber 34 , and a pressure valve 33 is fixedly connected to the middle of the air inlet 35 ;

[0033] A baffle 32 is fixedly connected to the middle of the inner peripheral wall of the resonance chamber 34 , and a gap 36 for air flow is provided between one side of the baffle 32 and the inner peripheral wall of the resonance chamber 34 ;

[0034] An exhaust hole 37 communicating with the resonance chamber 34 is defined on the outer side of the housing 31 near the notch 36 .

[0035] In this embodiment, since the gas chromatograph is generally composed of an air path system, an injection system, a separation system, a detection and temperature control system, and a recording system, two adjacent systems are connected by pipes. As the pipes age and become damaged, their air tightness will weaken, causing air to mix into the chromatograph during use and affecting the accuracy of the chromatograph.

[0036] Therefore, observe Figure 1 and Figure 2 It can be found that by providing the main housing 11 and the auxiliary housing 12, and hingedly connecting one side of the main housing 11 and the auxiliary housing 12 and clamping the other side through the clamp 4, the main and auxiliary housings can be buckled onto the outside of the pipe connection.

[0037] Then look at Figure 3 and Figure 4 It can be found that a mounting groove 5 is commonly provided in the upper and lower shells, and a sealing airbag 2 is symmetrically arranged in the mounting groove 5. At the same time, a gap is left between the two sealing airbags 2, so that when there is air leakage at the pipe connection, the gas will enter the air inlet 35 of the shell 31 through the gap, and then enter the resonance chamber 34 through the air inlet 35. The air that then enters the resonance chamber 34 will be blocked by the baffle 32 and pass through the notch 36 of the baffle 32, so that when the air enters the resonance chamber 34, it passes through a narrow path, causing the narrow gap to accelerate the airflow. The increase in airflow speed will reduce the pressure, thereby forming a negative pressure area around the air. This negative pressure area will attract the air in the high-pressure area, thereby generating a vibration of the blowing flow. Therefore, an exhaust hole 37 connected to the resonance chamber 34 is provided on the outer side of the shell 31 near the notch 36, so that when the leaked gas passes through the notch 36, it will suck in the outside air, causing the air to generate vortex and vibrate in the resonance chamber 34, thereby making the alarm 3 sound, reminding of the leak, and achieving the effect of detecting the leak.

[0038] However, when the chromatograph's pipe connection leaks, high-speed airflow will not be generated. For example, the sealing of the pipe connection that is not seriously aged is only slightly weakened, so that the air leakage is also relatively slow, and the slow airflow cannot make the alarm 3 sound, affecting the sensitivity of the alarm 3. Therefore, observe Figure 4It can be found that the pressure valve 33 in the middle of the air inlet 35 can prevent the leaked air from directly entering the air inlet 35, but accumulate in the gap between the two sealed airbags 2. The accumulated pressure will increase the air pressure until the pressure exceeds the threshold of the pressure valve 33. The air pushes open the pressure valve and enters the resonance chamber 34, which can effectively ensure the air flow rate, so that the alarm 3 can be stably triggered to sound when there is an air leak, thereby ensuring the sensitivity of the alarm 3.

[0039] In summary, when using the chromatograph air tightness detection device, first put the collar 1 on the pipe connection, then block the chromatograph's air outlet, allowing air to enter the chromatograph's air inlet. When the air outlet is blocked, the pressure in the pipe increases, ensuring sufficient pressure in the pipe to prevent leaked gas from flowing back. When a leak occurs, the gas will enter the mounting groove 5 of the collar 1, enter the resonance chamber 34 through the air inlet 35 connected to the resonance chamber 34 through the mounting groove 5, and pass through the notch 36 of the baffle 32, causing the alarm 3 to sound, alerting the user of the leak. When there is no leak, the alarm 3 will not sound, allowing for a quick test of the air tightness of the pipe connection.

[0040] In a further preferred embodiment of the present invention, Figure 3 As shown, each group of the sealing airbags 2 is provided with two, and are respectively fixedly connected to the left and right inner walls of the mounting groove 5. A gap is left between the two sealing airbags 2 in the same group, and an extrusion member 6 for extruding the airbag is provided in the gap;

[0041] The extrusion member 6 includes a pressure plate 61 and a spring 62. Two pressure plates 61 are provided and are fixedly connected to the side walls of the two sealing airbags 2 respectively. A spring 62 for pushing the pressure plate 61 is fixedly connected between the two pressure plates 61.

[0042] The sealing airbag 2 is in a semicircular ring shape, so that when the main housing 11 and the auxiliary housing 12 are buckled together, the two sealing airbags 2 on the same side form a complete ring.

[0043] In this embodiment, by observing Figure 3 It can be found that the two sealing airbags 2 are both semi-circular, so that when the main shell 11 and the auxiliary shell 12 are buckled together, the two sealing airbags 2 form a complete ring, so that the sealing airbags 2 can completely cover the outer wall of the pipe connection, which can effectively ensure the sealing performance of the sealing airbags 2.

[0044] A pressure plate 61 is provided between the two sealing airbags 2, and two pressure plates 61 are provided, which are fixedly connected to the side walls of the two sealing airbags 2 respectively. Then a spring 62 is fixedly connected between the two pressure plates 61, so that the spring 62 can push the pressure plate 61 to squeeze the sealing airbag 2, so that the sealing airbag 2 is deformed under pressure and the inner peripheral wall bulges outward, so that when the main shell 11 and the auxiliary shell 12 are buckled at the pipeline connection, the sealing airbag 2 can fit tightly with the outer wall of the pipeline connection, which can ensure the airtightness of the ring 1, thereby ensuring the detection accuracy of the chromatograph airtightness detection device.

[0045] Due to the setting of the pressure valve 33, when the gap pressure between the two sealing airbags 2 increases, the air pressure will exert pressure on the pressure plate 61, causing the pressure plate 61 to further squeeze the sealing airbags 2, thereby further reducing the contact gap between the sealing airbags 2 and the outer wall of the pipe connection, which can greatly improve the sealing performance of the connection between the ring 1 and the pipe.

[0046] In a further preferred embodiment of the present invention, Figure 3 As shown, the front and rear edges of the mounting groove 5 are both chamfered, and a sealing strip 7 is embedded on the outer side of the chamfer.

[0047] In this embodiment, due to the arrangement of the pressure plate 61 and the spring 62, the sealing airbag 2 will be squeezed and deformed under normal conditions, resulting in that when the main housing 11 and the secondary housing 12 are buckled together, the two inflated sealing airbags 2 will contact and squeeze each other, causing the contact parts to be compressed and the surrounding compressed parts to expand. When the main housing 11 and the secondary housing 12 are buckled together, the intersection between them will clamp the sealing airbag 2, causing the sealing airbag 2 to be damaged and leak, thereby affecting the sealing performance of the connection between the ring 1 and the pipeline.

[0048] Therefore, observe Figure 3 It can be found that chamfers are processed on the front and rear edges of the mounting groove 5, which can be used to avoid the inflated sealing airbag 2 and ensure the safety of the sealing airbag 2. At the same time, a sealing strip 7 is provided on the outside of the chamfer, so that the side of the main shell 11 and the auxiliary shell 12 where the sealing airbag 2 is not provided can also maintain close contact, avoiding air leakage in the area where the sealing airbag 2 is not provided, and further ensuring the operating stability of the chromatograph air tightness detection device.

[0049] In a further preferred embodiment of the present invention, Figure 3 As shown, the fastener 4 includes a connecting fastener 41 and a connecting socket 42, which are fixedly connected to the main housing 11 and the auxiliary housing 12 respectively. A card slot 8 is provided on the side of the connecting socket 42 close to the connecting fastener 41, and a protrusion is formed on the side of the connecting fastener 41 close to the connecting socket 42 to form a card connection portion 9 for inserting into the card slot 8.

[0050] In this embodiment, since there are many pipe connections of the chromatograph, when it is necessary to check the leakage points one by one, it is necessary to install the chromatograph air tightness detection device at different pipe connections in sequence, or to install multiple chromatograph air tightness detection devices at multiple pipe connections at the same time, which can be used to accurately locate the leakage points. Regardless of whether it is checked in sequence or multiple simultaneous checks, it is necessary to install the chromatograph air tightness detection device at the pipe connection, and remove the chromatograph air tightness detection device after the inspection is completed, so the observation Figure 3 It can be found that a connecting seat 42 and a connecting buckle 41 are respectively provided on the side of the main shell 11 and the auxiliary shell 12 away from the hinged part, and a card slot 8 is opened on the side of the connecting seat 42 close to the connecting buckle 41, and a protrusion on the side of the connecting buckle 41 close to the connecting seat 42 is formed with a card connection part 9 for inserting into the card slot 8, so that when the main shell 11 and the auxiliary shell 12 are buckled at the pipeline connection, the card connection part 9 is inserted into the card slot 8 to clamp the main shell 11 and the auxiliary shell 12. Subsequently, when in use, it is only necessary to unfasten the card connection between the card connection part 9 and the card slot 8 to separate the chromatograph air tightness detection device, which can effectively improve the installation efficiency of the chromatograph air tightness detection device and make the use of the chromatograph air tightness detection device simpler and more convenient.

[0051] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A chromatograph air tightness detection device, characterized in that: The invention comprises a sleeve (1), which is composed of a main sleeve (11) and a secondary sleeve (12). One side of the main sleeve (11) and the secondary sleeve (12) are hinged, and the other side is clamped by a fastener (4), so that the main sleeve (11) and the secondary sleeve (12) are sleeved on the pipeline connection of the chromatograph. The inner walls of the main sleeve (11) and the secondary sleeve (12) are both provided with an installation groove (5) for connecting the sealing airbag (2); Sealing airbags (2) are provided in two groups and are connected to the main housing (11) and the auxiliary housing (12) respectively; The alarm (3) includes a housing (31) fixedly connected to the outer edge of the main housing (11), and a resonance cavity (34) is provided in the housing (31); An air inlet (35) communicating with the mounting groove (5) is provided at the bottom of the resonance chamber (34), and a pressure valve (33) is fixedly connected to the middle of the air inlet (35); A baffle (32) is fixedly connected to the middle portion of the inner peripheral wall of the resonance chamber (34), and a gap (36) for air flow is provided between one side of the baffle (32) and the inner peripheral wall of the resonance chamber (34); An exhaust hole (37) communicating with the resonance cavity (34) is provided on the outer side of the shell (31) near the notch (36).

2. A chromatograph air tightness detection device according to claim 1, characterized in that: Each group of sealing airbags (2) is provided with two, and are fixedly connected to the left and right inner walls of the installation groove (5), respectively. A gap is left between the two sealing airbags (2) in the same group, and an extrusion piece (6) for extruding the airbag is provided in the gap.

3. A chromatograph air tightness detection device according to claim 2, characterized in that, The extrusion member (6) includes a pressure plate (61) and a spring (62). Two pressure plates (61) are provided and are fixedly connected to the side walls of the two sealing airbags (2) respectively. A spring (62) for pushing the pressure plate (61) is fixedly connected between the two pressure plates (61).

4. A chromatograph air tightness detection device according to claim 3, characterized in that: The sealing airbag (2) is in a semicircular ring shape, so that when the main housing (11) and the auxiliary housing (12) are buckled together, the two sealing airbags (2) on the same side form a complete ring.

5. A chromatograph air tightness detection device according to claim 4, characterized in that: The front and rear edges of the installation groove (5) are both chamfered, and a sealing strip (7) is embedded on the outer side of the chamfer.

6. A chromatograph air tightness detection device according to claim 5, characterized in that: The buckle (4) comprises a connecting buckle (41) and a connecting clamping seat (42), the connecting buckle (41) and the connecting clamping seat (42) being fixedly connected to the main housing (11) and the auxiliary housing (12) respectively, a clamping slot (8) is provided on a side of the connecting clamping seat (42) close to the connecting buckle (41), and a clamping portion (9) for inserting into the clamping slot (8) is formed on a protrusion on a side of the connecting buckle (41) close to the connecting clamping seat (42).

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