A VOC detector

Abstract

The present invention belongs to the technical field of VOC gas detection, and specifically relates to a VOC detector, which includes a bottom shell, a detector body is fixedly connected to the upper side of the bottom shell, a connection port is arranged on the outer wall of the bottom shell, a pipe head is detachably connected to the connection port, a filter screen is detachably connected in the bottom shell, and a protective mechanism and an auxiliary shock-off assembly are arranged inside the connection port. The VOC detector uses a protective mechanism so that after the pipe head is connected to the connection port, the pipe head squeezes the protective ring. After the pipe head is fixed, the push rod can push the protective cover to open, so that subsequent gas can enter the detector body for detection. When the detector body is not in use, the pipe head is separated from the connection port, and the protective ring is reset under the action of a reset spring. At the same time, the protective cover on the protective ring is rotated and reset under the action of a torsion spring to ensure the accuracy of subsequent detection by the device.

Description

Technical Field

[0001] The present invention relates to the technical field of VOC gas detection, in particular to a VOC detector. Background Art

[0002] VOC detector, also known as volatile organic compound detection instrument, is mainly used to detect the concentration of volatile organic compound (VOC) gas in various ambient air.

[0003] At present, in the prior art, as the core component of the VOC detector, the sensor directly affects the response time and detection accuracy of the instrument. During the detection process, the connecting port is connected to the detection tube, and then the vacuum pump is started to draw the gas into the VOC detector. The sensor detects the gas. However, the gas may contain impurities. After the impurities enter the VOC detector, the accuracy of the VOC gas detection data will be affected. In view of this, the present invention proposes a VOC detector. Summary of the invention

[0004] The main purpose of the present invention is to provide a VOC detector that can solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention proposes the following technical solutions:

[0006] A VOC detector comprises a bottom shell, the upper side of which is fixedly connected to a detector body, a connection port is arranged on the outer wall of the bottom shell, a pipe head is detachably connected to the connection port, a filter screen is detachably connected in the bottom shell, a protection mechanism and an auxiliary shaking-off component are arranged inside the connection port, a fixing component and a sealing component are arranged on the connection port, and the protection mechanism comprises:

[0007] A protective ring, the protective ring is slidably connected in the connection port, a protective cover is hinged on the outer wall of the protective ring, and a hinge shaft of the protective cover is elastically connected to the inner surface of the protective ring through a torsion spring;

[0008] A guide rod, the guide rod is fixedly connected to the outer wall of the protective ring, the guide rod passes through the fixed block and is slidably connected to the fixed block, the fixed block is fixedly connected to the inner surface of the connecting port, and the fixed block and the protective ring are elastically connected via a return spring;

[0009] A connecting rod, one end of which is fixedly connected to the outer wall of the guide rod, and the other end of which is fixedly connected to the outer wall of the circular sleeve;

[0010] And a push rod, a spiral groove is provided on the outer wall of the push rod, a cleaning brush is fixedly connected to the outer wall of the push rod, the cleaning brush is in contact with the filter, when the pipe head is connected to the connecting port, the pipe head squeezes the protective ring, after the pipe head is fixed, the push rod can push the protective cover to open, so that subsequent gas can enter the detector body for detection, when the detector body is not in use, the pipe head is separated from the connecting port, and the protective ring is reset under the action of the reset spring, and at the same time, the protective cover on the protective ring rotates and resets under the action of the torsion spring to prevent external impurities from entering the connecting port, thereby ensuring the accuracy of the subsequent detection of the device.

[0011] Preferably, a positioning opening is provided on a side of the protective ring away from the guide rod, and a protrusion is fixedly connected to the outer wall of the guide rod.

[0012] Preferably, a ball is embedded in the circular sleeve, and the ball rolls in the spiral groove. The push rod is rotatably connected to the outer wall of the filter screen, and the connecting rod is driven to move by the guide rod, which drives the circular sleeve to slide on the push rod. The ball rolls in the spiral groove, so that the push rod drives the cleaning brush to rotate, and impurities attached to the filter screen are cleaned to prevent affecting the filtering effect of the gas.

[0013] Preferably, the fixing assembly includes a fixing sleeve, which is fixedly connected to the outer wall of the connecting port, and a sliding pad is slidably connected in the fixing sleeve, and the sliding pad is elastically connected to the inner wall of the fixing sleeve through a connecting spring, and a clamping rod is fixedly connected to the side of the sliding pad close to the pipe head, and a pull rod is fixedly connected to the side of the sliding pad away from the clamping rod, and the pull rod is sleeved by the fixing sleeve, and by pulling the pull rod, after the sliding pad compresses the connecting spring, the clamping rod will be driven to move, thereby facilitating the release of the fixation of the connecting port and the pipe head.

[0014] Preferably, the sealing assembly includes an air bin, which is fixedly connected to the outer wall of the connecting port, a piston in the air bin is connected to a piston ring, a side of the piston ring close to the guide rod is fixedly connected to a vertical rod, the piston ring is elastically connected to the inner wall of the air bin by an extrusion spring, the air bin is connected to an air pipe, an end of the air pipe away from the air bin is connected to a sealing ring, the sealing ring is fixedly connected to the end of the connecting port, after the connecting port is fixed to the pipe head, the protrusion on the guide rod gradually moves in the direction of the vertical rod until the vertical rod is lifted up, at this time, the piston ring squeezes the gas in the air bin through the air pipe into the sealing ring, so that the sealing ring is in close contact with the pipe head, thereby improving the sealing effect when the connecting port and the pipe head are fixed, preventing outside air from entering the connecting port, and ensuring the accuracy of the detection result.

[0015] Preferably, a positioning head is fixedly connected to the end of the pipe head, the positioning head matches the positioning port, and a bayonet is provided on the outer wall of the pipe head.

[0016] Preferably, the auxiliary shaking-off assembly includes a cross bar, which is penetrated by the positioning shaft and rotatably connected to the positioning shaft, the cross bar and the positioning shaft are elastically connected via a torsion spring, and the positioning shaft is fixedly connected to the inner wall of the connecting port. In the process of the top rod driving the cleaning brush to rotate, the cleaning brush collides, contacts and passes through the cross bar, the cross bar rotates and can be reset under the action of the torsion spring, and the impurities on the cleaning brush can be vibrated to assist in the falling off of the impurities on the cleaning brush.

[0017] Preferably, after the locking rod is locked into the locking port, the push rod abuts against the protective cover, and the protective cover rotates to open.

[0018] Preferably, when the circular sleeve slides on the push rod, the balls in the circular sleeve roll in the spiral grooves, driving the push rod to rotate.

[0019] Preferably, an air pump is embedded in the bottom shell, the air extraction pipe of the air pump is connected to the air chamber of the bottom shell, the air supply pipe of the air pump is connected to the detector body, and a connection cover is detachably connected to the outer wall of the bottom shell.

[0020] The present invention provides a VOC detector, which has the following beneficial effects:

[0021] (1) The VOC detector uses a protective mechanism to connect the pipe head to the connection port. The pipe head squeezes the protective ring. After the pipe head is fixed, the push rod can push the protective cover open, allowing subsequent gas to enter the detector body for detection. When the detector body is not in use, the pipe head is separated from the connection port, and the protective ring is reset under the action of the reset spring. At the same time, the protective cover on the protective ring rotates and resets under the action of the torsion spring to prevent external impurities from entering the connection port, thereby ensuring the accuracy of the subsequent detection of the device.

[0022] (2) The VOC detector uses a protective mechanism. When the guide rod moves, the circular sleeve is driven to slide on the top rod, and the ball rolls in the spiral groove, so that the top rod drives the cleaning brush to rotate, and the impurities attached to the filter net are cleaned to prevent the gas filtering effect from being affected, thereby improving the use effect of the device.

[0023] (3) The VOC detector uses a protective mechanism and a sealing component. After the connection port and the pipe head are fixed, the protrusion on the guide rod gradually moves toward the direction of the vertical rod until the vertical rod is lifted up. At this time, the piston ring squeezes the gas in the gas chamber through the air pipe into the sealing ring, so that the sealing ring and the pipe head are in close contact, which improves the sealing effect when the connection port and the pipe head are fixed, prevents outside air from entering the connection port, and ensures the accuracy of the detector body detection. At the same time, in the process of separating the connection port and the pipe head, the vertical rod is reset downward, and the sealing ring shrinks, which reduces the wear of the sealing ring and the pipe head and increases the service life of the sealing ring.

[0024] (4) The VOC detector uses a protective mechanism and an auxiliary shaking-off component, so that when the top rod drives the cleaning brush to rotate, the cleaning brush collides with, contacts and passes through the cross bar, the cross bar rotates and can be reset under the action of a torsion spring, and the impurities on the cleaning brush can be vibrated, thereby assisting the impurities on the cleaning brush to fall off. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the bottom shell of the present invention;

[0028] Figure 3 The present invention is a partial cross-sectional structure schematic diagram Figure 1 ;

[0029] Figure 4 For the present invention Figure 3 Schematic diagram of the structure of A;

[0030] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of middle B;

[0031] Figure 6 It is a schematic diagram of the structure of the protection mechanism of the present invention;

[0032] Figure 7 The present invention is a partial cross-sectional structure schematic diagram Figure 2 ;

[0033] Figure 8 For the present invention Figure 7 Schematic diagram of the C structure;

[0034] Fig. 9 This is a schematic diagram of the filter screen disassembly structure of the present invention;

[0035] Fig.10 It is a schematic diagram of the structure of the pipeline head of the present invention.

[0036] In the figure: 1, bottom shell; 2, detector body; 3, connection port; 4, pipe head; 5, filter screen; 6, protection mechanism; 7, fixing assembly; 8, sealing assembly; 9, auxiliary shock-off assembly; 101, vacuum pump; 102, connecting cover; 41, positioning head; 42, bayonet; 61, protective ring; 62, protective cover; 63, guide rod; 64, fixing block; 65, connecting rod; 66, round sleeve; 67, push rod; 68, spiral groove; 69, cleaning brush; 611, positioning port; 631, protrusion; 71, fixing sleeve; 72, sliding pad; 73, pull rod; 74, clamping rod; 81, air chamber; 82, piston ring; 83, vertical rod; 84, air pipe; 85, sealing ring; 91, cross bar; 92, positioning shaft.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-Figure 10 The present invention proposes a VOC detector, including a bottom shell 1, a detector body 2 is fixedly connected to the upper side of the bottom shell 1, an air pump 101 is embedded and installed in the bottom shell 1, an air extraction pipe of the air extraction pump 101 is connected to the air chamber of the bottom shell 1, an air supply pipe of the air extraction pump 101 is connected to the detector body 2, and a connection cover 102 is detachably connected to the outer wall of the bottom shell 1. By starting the air extraction pump 101, the air extraction pump 101 can suck the gas to be detected into the air chamber of the bottom shell 1, and then the gas is discharged through the air supply pipe of the air extraction pump 101. The input is into the detector body 2 for detection, a connecting port 3 is provided on the outer wall of the bottom shell 1, the connecting port 3 is detachably connected to the pipe head 4, and a filter screen 5 is detachably connected in the bottom shell 1. When the filter screen 5 needs to be maintained, the bolts on the connecting cover 102 are removed to separate the connecting cover 102 from the bottom shell 1, and the filter screen 5 can be removed and maintained. A protective mechanism 6 and an auxiliary shaking-off component 9 are provided inside the connecting port 3, and a fixing component 7 and a sealing component 8 are provided on the connecting port 3.

[0040] In the embodiment of the present invention, in order to prevent impurities from entering the detector body 2, specifically, the protective mechanism 6 includes a protective ring 61, a guide rod 63, a connecting rod 65 and a push rod 67. The protective ring 61 is slidably connected to the connecting port 3. A protective cover 62 is hinged on the outer wall of the protective ring 61. The hinge axis of the protective cover 62 is elastically connected to the inner surface of the protective ring 61 through a torsion spring. The guide rod 63 is fixedly connected to the outer wall of the protective ring 61. The guide rod 63 passes through the fixed block 64 and is slidably connected to the fixed block 64. The fixed block 64 is fixedly connected to the inner surface of the connecting port 3. The fixed block 64 is elastically connected to the protective ring 61 through a reset spring. The push rod 67 is rotatably connected to the outer wall of the filter screen 5. After the locking rod 74 is locked into the locking port 42, the push rod 67 abuts the protective cover 62, and the protective cover 62 rotates to open. After the pipe head 4 is connected to the connecting port 3, the pipe head 4 squeezes the protective ring 61. After the pipe head 4 is fixed, the push rod 67 can push the protective cover 62 to open, so that the gas can enter the connecting port 3 through the pipe head 4, and then enter the detector body 2 for detection. When the detector body 2 is not in use, the pipe head 4 is separated from the connecting port 3, and the protective ring 61 is reset under the action of the reset spring. At the same time, the protective cover 62 on the protective ring 61 rotates and resets under the action of the torsion spring to prevent external impurities from entering the connecting port 3, thereby ensuring the accuracy of the subsequent detection of the device.

[0041] Further, in order to ensure that the gas is filtered through the filter screen 5 normally, specifically, one end of the connecting rod 65 is fixedly connected to the outer wall of the guide rod 63, and the other end of the connecting rod 65 is fixedly connected to the outer wall of the circular sleeve 66. A spiral groove 68 is provided on the outer wall of the push rod 67. When the circular sleeve 66 slides on the push rod 67, the ball in the circular sleeve 66 rolls in the spiral groove 68, driving the push rod 67 to rotate. A cleaning brush 69 is fixedly connected to the outer wall of the push rod 67, and the cleaning brush 69 contacts the filter screen 5. A ball is embedded in the circular sleeve 66, and the ball rolls in the spiral groove 68. The push rod 67 is rotatably connected to the outer wall of the filter screen 5. During the movement of the guide rod 63, the connecting rod 65 is driven to move, and then the circular sleeve 66 is driven to slide on the push rod 67. The ball rolls in the spiral groove 68, so that the push rod 67 drives the cleaning brush 69 to rotate, and the impurities attached to the filter screen 5 are cleaned, so as to prevent the filtering effect of the gas from being affected, thereby improving the use effect of the device.

[0042] Furthermore, in order to improve the cleaning effect of the subsequent cleaning brush 69 on the filter screen 5, specifically, the auxiliary shaking-off component 9 includes a cross bar 91, the cross bar 91 is penetrated by the positioning shaft 92 and is rotatably connected to the positioning shaft 92, the cross bar 91 and the positioning shaft 92 are elastically connected by a torsion spring, and the positioning shaft 92 is fixedly connected to the inner wall of the connecting port 3. During the process of the top rod 67 driving the cleaning brush 69 to rotate, the cleaning brush 69 collides, contacts and passes through the cross bar 91, and the cross bar 91 rotates and can be reset under the action of the torsion spring, and the impurities on the cleaning brush 69 can be vibrated, and the impurities on the auxiliary cleaning brush 69 fall off, thereby improving the cleaning effect of the subsequent cleaning brush 69 on the filter screen 5.

[0043] The cam 72 is pressed against the locking nut 74 to secure the flange 76 of the locking nut 76. The cam 72 is pressed against the locking nut 76 to secure the flange 76. The cam 72 is pressed against the locking nut 76 to secure the flange 76.

[0044] Furthermore, in order to ensure stable docking between the connecting port 3 and the pipe head 4, specifically, a positioning port 611 is provided on the side of the protective ring 61 away from the guide rod 63, and a positioning head 41 is fixedly connected to the end of the pipe head 4, and the positioning head 41 matches the positioning port 611. In the process of fixing the connecting port 3 and the pipe head 4, the positioning head 41 of the pipe head 4 is first aligned with the positioning port 611, and the positioning head 41 is inserted into the positioning port 611, and then the pipe head 4 is pushed to stably fix the pipe head 4 and the connecting port 3.

[0045] In the embodiment of the present invention, in order to ensure the sealing effect of the device when in use and prevent external impurities from entering the connecting port 3 and affecting the detection effect of the detector body 2, specifically, the sealing component 8 includes an air bin 81, the air bin 81 is fixedly connected to the outer wall of the connecting port 3, the piston in the air bin 81 is connected to a piston ring 82, the side of the piston ring 82 close to the guide rod 63 is fixedly connected to a vertical rod 83, the piston ring 82 is elastically connected to the inner wall of the air bin 81 through an extrusion spring, the air bin 81 is connected to an air pipe 84, the end of the air pipe 84 away from the air bin 81 is connected to a sealing ring 85, the sealing ring 85 is fixedly connected to the end of the connecting port 3, and the connecting port 3 and During the process of fixing the pipe head 4, the protrusion 631 on the guide rod 63 gradually moves toward the direction of the vertical rod 83 until the vertical rod 83 is lifted up. At this time, the piston ring 82 squeezes the gas in the air chamber 81 into the sealing ring 85 through the air pipe 84, so that the sealing ring 85 is in close contact with the pipe head 4, thereby improving the sealing effect when the connecting port 3 and the pipe head 4 are fixed, preventing outside air from entering the connecting port 3, and ensuring the accuracy of the detection of the detector body 2. At the same time, during the process of separating the connecting port 3 from the pipe head 4, the vertical rod 83 is reset downward, and the sealing ring 85 shrinks, thereby reducing the wear of the sealing ring 85 and the pipe head 4 and increasing the service life of the sealing ring 85.

[0046] It should be noted that the above-mentioned electrical components are all existing technology products. Technical personnel in this field select, install and complete the circuit debugging work according to the needs of use to ensure that all electrical appliances can work normally. The components are all universal standard parts or components known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods. The applicant does not make specific restrictions here.

[0047] When in use, first fix the connecting port 3 with the pipe head 4, first align the positioning head 41 of the pipe head 4 with the positioning port 611, insert the positioning head 41 into the positioning port 611, and then push the pipe head 4, the pipe head 4 squeezes the protective ring 61, and the pipe head 4 gradually approaches the clamping rod 74. At the same time, the pipe head 4 squeezes the clamping rod 74 to shrink. When the clamping port 42 gradually aligns with the clamping rod 74, under the reset action of the connecting spring, the clamping rod 74 is inserted into the clamping port 42 to achieve the limited fixation of the pipe head 4, and the push rod 67 can push the protective cover 62 to open, and then start the vacuum pump 101. The vacuum pump 101 can suck the gas to be detected into the air chamber of the bottom shell 1, and then input it into the detector body 2 through the air supply pipe of the vacuum pump 101 for detection;

[0048] At the same time, during the movement of the protective ring 61, the guide rod 63 is driven to move, and then the connecting rod 65 is driven to move, so that the round sleeve 66 slides on the top rod 67, and the ball rolls in the spiral groove 68, so that the top rod 67 drives the cleaning brush 69 to rotate, and the impurities attached to the filter screen 5 are cleaned. During the process of the cleaning brush 69 driven by the top rod 67 to rotate, the cleaning brush 69 collides with, contacts and passes through the cross bar 91, and the cross bar 91 rotates and can be reset under the action of the torsion spring, and the impurities on the cleaning brush 69 can be vibrated, which helps the impurities on the cleaning brush 69 to fall off;

[0049] At the same time, during the process of fixing the connection port 3 and the pipe head 4, the protrusion 631 on the guide rod 63 gradually moves toward the direction of the vertical rod 83 until the vertical rod 83 is lifted up. At this time, the piston ring 82 squeezes the gas in the gas chamber 81 into the sealing ring 85 through the air pipe 84, so that the sealing ring 85 is in close contact with the pipe head 4, thereby improving the sealing effect when the connection port 3 and the pipe head 4 are fixed, preventing the outside air from entering the connection port 3, and ensuring the accuracy of the detection of the detector body 2. In addition, during the process of separating the connection port 3 from the pipe head 4, the vertical rod 83 is reset downward, and the sealing ring 85 is contracted, thereby reducing the wear of the sealing ring 85 and the pipe head 4.

[0050] At the same time, when the detector body 2 is not in use, the pipe head 4 is separated from the connecting port 3, and the protective ring 61 is reset under the action of the reset spring. At the same time, the protective cover 62 on the protective ring 61 rotates and resets under the action of the torsion spring to prevent external impurities from entering the connecting port 3.

Claims

1. A VOC detector, comprising a bottom shell (1), characterized in that: The upper side of the bottom shell (1) is fixedly connected to a detector body (2); a connection port (3) is provided on the outer wall of the bottom shell (1); a pipe head (4) is detachably connected to the connection port (3); a filter screen (5) is detachably connected to the bottom shell (1); a protective mechanism (6) and an auxiliary shaking-off component (9) are provided inside the connection port (3); a fixing component (7) and a sealing component (8) are provided on the connection port (3); the protective mechanism (6) comprises: A protective ring (61), the protective ring (61) being slidably connected to the connection port (3), a protective cover (62) being hingedly connected to the outer wall of the protective ring (61), and a hinge axis of the protective cover (62) being elastically connected to the inner surface of the protective ring (61) via a torsion spring; a guide rod (63), the guide rod (63) being fixedly connected to the outer wall of the protective ring (61), the guide rod (63) passing through the fixed block (64) and being slidably connected to the fixed block (64), the fixed block (64) being fixedly connected to the inner surface of the connecting port (3), the fixed block (64) being elastically connected to the protective ring (61) via a return spring; A connecting rod (65), one end of the connecting rod (65) is fixedly connected to the outer wall of the guide rod (63), and the other end of the connecting rod (65) is fixedly connected to the outer wall of the circular sleeve (66); A push rod (67) is provided with a spiral groove (68) on the outer wall of the push rod (67). A cleaning brush (69) is fixedly connected to the outer wall of the push rod (67). The cleaning brush (69) contacts the filter screen (5). A ball is embedded in the circular sleeve (66), and the ball rolls in the spiral groove (68). The push rod (67) is rotatably connected to the outer wall of the filter screen (5). When the circular sleeve (66) slides on the push rod (67), the ball in the circular sleeve (66) rolls in the spiral groove (68), driving the push rod (67) to rotate.

2. A VOC detector according to claim 1, characterized in that: A positioning opening (611) is provided on a side of the protective ring (61) away from the guide rod (63), and a protrusion (631) is fixedly connected to the outer wall of the guide rod (63).

3. A VOC detector according to claim 2, characterized in that: The fixing assembly (7) comprises a fixing sleeve (71), the fixing sleeve (71) being fixedly connected to the outer wall of the connecting port (3), a sliding pad (72) being slidably connected in the fixing sleeve (71), the sliding pad (72) being elastically connected to the inner wall of the fixing sleeve (71) via a connecting spring, a clamping rod (74) being fixedly connected to the side of the sliding pad (72) close to the pipe head (4), and a pull rod (73) being fixedly connected to the side of the sliding pad (72) away from the clamping rod (74), and the pull rod (73) being sleeved by the fixing sleeve (71).

4. A VOC detector according to claim 1, characterized in that: The sealing assembly (8) comprises an air bin (81), wherein the air bin (81) is fixedly connected to the outer wall of the connecting port (3), a piston in the air bin (81) is connected to a piston ring (82), a side of the piston ring (82) close to the guide rod (63) is fixedly connected to a vertical rod (83), the piston ring (82) is elastically connected to the inner wall of the air bin (81) via an extrusion spring, the air bin (81) is connected to an air pipe (84), an end of the air pipe (84) away from the air bin (81) is connected to a sealing ring (85), and the sealing ring (85) is fixedly connected to the end of the connecting port (3).

5. A VOC detector according to claim 3, characterized in that: A positioning head (41) is fixedly connected to the end of the pipe head (4), the positioning head (41) matches the positioning opening (611), and a bayonet (42) is provided on the outer wall of the pipe head (4).

6. A VOC detector according to claim 1, characterized in that: The auxiliary shaking-off assembly (9) comprises a cross bar (91), the cross bar (91) being penetrated by a positioning shaft (92) and being rotatably connected to the positioning shaft (92), the cross bar (91) being elastically connected to the positioning shaft (92) via a torsion spring, and the positioning shaft (92) being fixedly connected to the inner wall of the connection port (3).

7. A VOC detector according to claim 5, characterized in that: After the latching rod (74) is latched into the latching port (42), the push rod (67) abuts against the protective cover (62), and the protective cover (62) rotates to open.

8. A VOC detector according to claim 1, characterized in that: An air pump (101) is embedded in the bottom shell (1), an air extraction pipe of the air pump (101) is connected to the air chamber of the bottom shell (1), an air supply pipe of the air pump (101) is connected to the detector body (2), and a connection cover (102) is detachably connected to the outer wall of the bottom shell (1).

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