Particulate matter concentration measuring device

Abstract

The utility model discloses a particulate matter concentration measuring device. The particulate matter concentration measuring device comprises a laser emitting module, a measuring chamber main body, a connecting seat and a lens module, a measurement chamber is formed in the measurement chamber main body; the laser emitting module is used for emitting laser to the measuring chamber; the connecting base is located between the laser emitting module and the measuring chamber body and connected with the laser emitting module and the measuring chamber body, a first laser channel allowing laser to pass through is formed in the connecting base, the first laser channel is communicated with the measuring chamber, and the connecting base is provided with a lens module mounting groove; the lens module is detachably installed in the lens module installation groove, the lens module seals the lens module installation groove and separates the first laser channel, and the lens module is configured to enable laser to pass through the lens module. Through the arrangement, the lens module can be conveniently disassembled to realize cleaning and maintenance of the lens, so that the accuracy of a particulate matter concentration measurement result is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of particulate matter concentration measurement, in particular to a particulate matter concentration measurement device. BACKGROUND

[0002] The particulate matter concentration measurement device measures the concentration of particulate matter by using the light scattering method. When light passes through the gas, the light will interact with the particulate matter in the gas, causing the light to scatter in all directions. When the light shines on the particulate matter, the particulate matter will scatter the light, and the intensity of the scattered light is proportional to the concentration of the particulate matter. By measuring the intensity of the scattered light, the concentration of the particulate matter can be calculated.

[0003] The particulate matter concentration measurement device includes related optical lenses. In the case of fixed pollution sources, the ambient air contains water vapor and various dusts that are easily adsorbed. When the particulate matter concentration measurement device is used to measure the concentration of particulate matter, since the optical lenses are partially exposed to the ambient air, over time, the optical lenses are easily contaminated, resulting in inaccurate measurement results. SUMMARY

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide a particulate matter concentration measurement device which can conveniently disassemble the lens module to realize cleaning and maintenance of the lenses, thereby improving the accuracy of the particulate matter concentration measurement results.

[0005] To achieve the above purpose, the present application adopts the following technical solution:

[0006] The present application provides a particulate matter concentration measurement device, which comprises: a laser emission module, a measurement chamber body, a connecting seat and a lens module; the inside of the measurement chamber body is formed with a measurement chamber; the laser emission module is used to emit laser to the measurement chamber; the connecting seat is located between the laser emission module and the measurement chamber body and connects the laser emission module and the measurement chamber body, the connecting seat is provided with a first laser channel for the laser to pass through, the first laser channel is communicated with the measurement chamber, the connecting seat has a lens module installation groove, the depth direction of the lens module installation groove is perpendicular to the length direction of the first laser channel, and the slot opening of the lens module installation groove is arranged on the outer side wall of the connecting seat; the lens module is detachably installed in the lens module installation groove, the lens module seals the lens module installation groove and separates the first laser channel, and the lens module is configured to allow the laser to pass through the lens module.

[0007] As a preferred technical scheme, the particulate matter concentration measuring device further comprises a pressing block, the connecting seat is provided with a pressing block mounting groove at one end close to the laser emitting module, the pressing block mounting groove is provided with an internal thread, the pressing block is provided with an external thread matched with the internal thread of the pressing block mounting groove, the pressing block is screwed into the pressing block mounting groove and has a pre-tightening force on the lens module, so as to press and fix the lens module on the connecting seat, and the pressing block is provided with a second laser channel allowing the laser to pass through in the depth direction of the pressing block mounting groove, and the second laser channel is communicated with the lens module mounting groove.

[0008] As a preferred technical scheme, the pressing block is provided with a plurality of wrenching grooves in the circumferential direction of the pressing block in the screwing direction, the wrenching grooves are used for inserting a wrenching rod to rotate the pressing block, and the wrenching grooves are not communicated with the second laser channel.

[0009] As a preferred technical scheme, the laser emitting module comprises a laser light source and a laser light source mounting seat, the laser light source is mounted on the laser light source mounting seat, the laser light source mounting seat is provided with a pressing block clamping groove at one end close to the connecting seat, and the pressing block is partially clamped in the pressing block clamping groove and sealed by the pressing block clamping groove.

[0010] As a preferred technical scheme, the connecting seat and the laser emitting module are connected through a plurality of studs, and a heat insulation interval is formed between the connecting seat and the laser emitting module.

[0011] As a preferred technical scheme, the particulate matter concentration measuring device further comprises a heat insulation block, the heat insulation block is located between the connecting seat and the measuring chamber main body, the heat insulation block is provided with a third laser channel allowing the laser to pass through, the third laser channel is communicated with the first laser channel, and the connecting seat, the heat insulation block and the measuring chamber main body are fixedly connected.

[0012] As a preferred technical scheme, the measuring chamber main body comprises a metal shell and at least one heating component, and the heating component is located on the metal shell and used for the metal shell.

[0013] As a preferred technical scheme, the connecting seat is made of polyformaldehyde resin material.

[0014] As a preferred technical scheme, the laser light source mounting seat is made of polyformaldehyde resin material.

[0015] As a preferred technical scheme, the heat insulation block is made of epoxy resin material.

[0016] Compared with the prior art, the particulate matter concentration measuring device has the following beneficial effects:

[0017] The particle concentration measuring device of the application can realize the light path conduction between the laser emitting module and the measuring chamber main body and the sealing of the measuring chamber main body when the lens module is inserted into the lens module mounting groove of the connecting seat, can realize the cleaning and maintenance of the lens when the lens module is pulled out of the lens module mounting groove of the connecting seat, thereby ensuring the cleanliness of the lens during the particle concentration measurement, and improving the accuracy of the particle concentration measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the particle concentration measuring device of the application.

[0019] Figure 2 It is an exploded view of the particle concentration measuring device of the application.

[0020] Figure 3 It is a sectional view of A-A section in the application. Figure 1

[0021] Figure 4 It is a structural schematic diagram of the connecting seat and the lens module of the application.

[0022] Among them, 100, particle concentration measuring device; 1, laser emitting module; 11, laser light source; 12, laser light source mounting seat; 121, pressure block clamping groove; 2, laser receiving module; 3, measuring chamber main body; 31, measuring chamber; 32, light source port; 33, metal shell; 34, heating component; 4, connecting seat; 41, first laser channel; 42, lens module mounting groove; 43, pressure block mounting groove; 5, lens module; 6, light trap; 7, pressure block; 71, second laser channel; 72, pulling groove; 8, heat insulation block; 81, third laser channel. DETAILED DESCRIPTION

[0023] In order to make the people in the art better understand the scheme of the application, the technical scheme in the specific embodiment of the application will be described clearly and completely below in combination with the drawings in the embodiment of the application.

[0024] As shown in Figure 1 , Figure 2 and Figure 3 , the application provides a particle concentration measuring device 100, which comprises a laser emitting module 1, a laser receiving module 2, a measuring chamber main body 3, a connecting seat 4 and a lens module 5.

[0025] ​The inside of the measurement chamber body 3 forms a measurement chamber 31. When measuring the concentration of particulate matter in the gas to be measured, the measurement chamber 31 is filled with the gas to be measured. The measurement chamber body 3 is provided with a light source opening 32 on one side, and the laser emitted from the laser emitting module 1 enters the measurement chamber 31 from the light source opening 32. The measurement chamber body 3 is provided with a light trap 6 on the side opposite to the light source opening 32, and the light trap 6 is used to capture the laser light that is not scattered by the particulate matter. The laser receiving module 2 is installed on the measurement chamber body 3, and the laser receiving module 2 is used to receive the laser signal scattered from the particulate matter. The laser emitting module 1 emits a laser signal, which enters the measurement chamber 31 through the light source opening 32. When the laser irradiates the particulate matter, scattering occurs. The unscattered laser light will directly enter the light trap 6 and be eliminated. The laser light scattered by the particulate matter will enter the laser receiving module 2 and be converted into an electrical signal. After the electrical signal is amplified by the signal amplifier, the concentration of particulate matter in the gas to be measured can be calculated according to the scattering theory.

[0026] The connecting seat 4 is located between the laser emitting module 1 and the measurement chamber body 3 and connects the laser emitting module 1 and the measurement chamber body 3. As shown in Figure 3 and Figure 4 The connecting seat 4 is provided with a first laser channel 41 for allowing the laser to pass through. The first laser channel 41 communicates with the measurement chamber 31 inside the measurement chamber body 3, and specifically, the first laser channel 41 communicates with the light source opening 32 of the measurement chamber body 3. The connecting seat 4 has a lens module mounting groove 42, the depth direction of the lens module mounting groove 42 is perpendicular to the length direction of the first laser channel 41, and the slot opening of the lens module mounting groove 42 is arranged on the outer side wall of the connecting seat 4. The lens module 5 is detachably installed in the lens module mounting groove 42. The lens module 5 seals the lens module mounting groove 42 and separates the first laser channel 41, and the lens module 5 is configured to allow the laser to pass through the lens module 5.

[0027] When the lens module 5 is inserted into the lens module mounting groove 42, the first laser channel 41 in the connecting seat 4 is blocked by the lens module 5, so that the external air cannot enter the measurement chamber 31 from the light source opening 32 of the measurement chamber body 3 through the first laser channel 41, thereby avoiding the external air entering the measurement chamber 31, achieving the sealing of the measurement chamber body 3, and further avoiding affecting the accuracy of the detection result of the particulate matter concentration of the gas to be measured. When the lens of the lens module 5 is contaminated, the lens module 5 is pulled out of the lens module mounting groove 42 for cleaning and maintenance, and then inserted into the lens module mounting groove 42, which can ensure that the lens is clean during the measurement of the particulate matter concentration, thereby improving the accuracy of the measurement result of the particulate matter concentration. In summary, the particulate matter concentration measuring device 100 of the present application can improve the accuracy of the measurement result of the particulate matter concentration.

[0028] In the present application, the connecting seat 4 is made of polyoxymethylene resin (POM) or the like. POM is a crystalline plastic, which has excellent properties such as fatigue resistance, creep resistance, wear resistance, heat resistance, impact resistance, and small friction coefficient and good self-lubricating property.

[0029] As an implementation manner, the lens module 5 is provided with an air curtain protection device near one end of the measurement chamber body 3 to prevent the lens near the one end of the measurement chamber body 3 from being contaminated by the to-be-measured gas, thereby improving the accuracy of the particulate matter concentration detection result. In the present application, the air curtain protection device is an air curtain protection film or an air curtain protection sheet or the like.

[0030] As an implementation manner, the particulate matter concentration measuring device 100 further comprises a pressing block 7. The connecting seat 4 is provided with a pressing block mounting groove 43 near one end of the laser emitting module 1, the pressing block mounting groove 43 is provided with an internal thread, the pressing block 7 is provided with an external thread matched with the internal thread of the pressing block mounting groove 43, the pressing block 7 is screwed into the pressing block mounting groove 43 and has a pre-tightening force on the lens module 5 to press and fix the lens module 5 on the connecting seat 4. The pressing block 7 is provided with a second laser passage 71 allowing laser to pass through in the depth direction of the pressing block mounting groove 43, and the second laser passage 71 is in communication with the lens module mounting groove 42. After the lens module 5 is inserted into the lens module mounting groove 42, the pressing block 7 is screwed into the pressing block mounting groove 43 to press and fix the lens module 5 on the connecting seat 4.

[0031] Specifically, the pressing block 7 is provided with a plurality of wrenching grooves 72 in the circumferential direction of the pressing block 7 in the screwing direction of the pressing block 7. A wrenching rod is inserted into the wrenching groove 72, and the pressing block 7 is twisted by the wrenching rod to be screwed into or out of the pressing block mounting groove 43. The wrenching rod is screwed into or out of the pressing block 7 by the lever principle, which is more labor-saving and facilitates the screwing of the pressing block 7 into or out of the pressing block mounting groove 43. The wrenching groove 72 is not in communication with the second laser passage 71, thereby avoiding the entry of external air into the second laser passage 71 through the wrenching groove 72. Since the second laser passage 71 is in communication with the first laser passage 41, dust in the external air is prevented from entering the first laser passage 41 and contaminating the lens, thereby improving the accuracy of the particulate matter concentration measurement result.

[0032] More specifically, the laser emitting module 1 includes a laser source 11 and a laser source mounting base 12. The laser source 11 is used to emit laser light, and it is mounted on the laser source mounting base 12. The laser source mounting base 12 has a pressure block groove 121 at one end near the connecting seat 4. A pressure block 7 is partially engaged in and sealed by the pressure block groove 121. After the end of the pressure block 7 near the laser source mounting base 12 is engaged in the pressure block groove 121, the end face of the pressure block 7 is in contact with the bottom of the groove 121, so that the second laser channel 71 is sealed around this end by the laser source mounting base 12, thereby preventing dust and other particles from entering the second laser channel 71. In this application, the laser source mounting base 12 is made of materials such as polyoxymethylene resin (POM). POM is a crystalline plastic with excellent properties such as fatigue resistance, creep resistance, wear resistance, heat resistance, and impact resistance, and it also has a low coefficient of friction and good self-lubricating properties.

[0033] In one implementation, the measuring chamber body 3 includes a metal outer shell 33 and at least one heating element 34. The heating element 34 is located on the metal outer shell 33 and is used to heat the metal outer shell 33. By heating the metal outer shell 33 with the heating element 34, the interior of the measuring chamber 31 is kept at a high temperature, thereby eliminating the interference of water vapor on the particulate matter concentration measurement and improving the accuracy of the particulate matter concentration measurement results. Specifically, the heating temperature is ≥150℃. In this application, the metal outer shell 33 is an aluminum alloy shell or a stainless steel shell, etc., and the heating element 34 is a heating block or a heating plate, etc.

[0034] In one implementation, the connecting base 4 and the laser emitting module 1 are connected by several studs, forming a heat-insulating gap between them. If the laser emitting module 1 is directly connected to the connecting base 4, the heat from the measuring chamber body 3 will be transferred to the laser emitting module 1 through heat conduction, affecting the laser source 11. Therefore, this application avoids the impact of heat conduction on the laser source 11 by setting a heat-insulating gap, thus improving the stability and service life of the laser source 11.

[0035] As one implementation, the particulate matter concentration measuring device 100 further includes a heat insulation block 8. The heat insulation block 8 is located between the connecting seat 4 and the measuring chamber body 3. The heat insulation block 8 has a third laser channel 81 that allows laser light to pass through. The third laser channel 81 is connected to the first laser channel 41. The connecting seat 4, the heat insulation block 8, and the measuring chamber body 3 are fixedly connected. The heat insulation block 8 serves to insulate the measuring chamber body 3 from the laser emitting module 1, preventing the heat from the measuring chamber body 3 from affecting the laser emitting module 1, thus improving the stability and lifespan of the laser source 11. In this application, the heat insulation block 8 is made of materials such as epoxy resin. Epoxy resin has characteristics such as high hardness, high density, and high temperature resistance, making it suitable for heat insulation applications at the metal heating component 34.

[0036] It should be noted that the axes of the second laser channel 71, the first laser channel 41, and the third laser channel 81 are basically on the same straight line, so that the laser emitted from the laser source 11 enters the second laser channel 71, the first laser channel 41, and the third laser channel 81 in sequence, and then enters the measuring chamber 31 from the light source port 32 of the measuring chamber body 3.

[0037] It should be noted that the two ends of the second laser channel 71 are sealed by the laser source mounting base 12 and the connecting base 4, respectively; the two ends of the first laser channel 41 are sealed by the pressure block 7 and the heat insulation block 8, respectively; and the two ends of the third laser channel 81 are sealed by the connecting base 4 and the measuring chamber body 3, respectively. Therefore, the laser channel from the laser emitting module 1 to the measuring chamber body 3 is a channel that is not connected to the outside air, preventing the outside air from contaminating the lens.

[0038] It should be noted that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates at least two. Unless otherwise stated, terms such as "front," "back," "left," "right," "lower," and / or "upper" are for illustrative purposes only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0039] The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0040] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A particulate matter concentration measuring device, characterized by, The particulate matter concentration measuring device comprises: a measuring chamber body, an inside of which is formed with a measuring chamber; a laser emission module for emitting laser to the measuring chamber; a connecting seat between the laser emission module and the measuring chamber body and connecting the laser emission module and the measuring chamber body, the connecting seat being provided with a first laser channel for laser to pass through, the first laser channel being communicated with the measuring chamber, the connecting seat being provided with a lens module mounting groove, a depth direction of the lens module mounting groove being perpendicular to a length direction of the first laser channel, a groove opening of the lens module mounting groove being arranged on an outer side wall of the connecting seat; a lens module being detachably mounted in the lens module mounting groove, the lens module sealing the lens module mounting groove and separating the first laser channel, and the lens module being configured to enable laser to pass through the lens module.

2. The particulate matter concentration measuring apparatus according to claim 1, characterized by, The particulate matter concentration measuring device further comprises: a pressing block, the connecting seat being provided with a pressing block mounting groove at one end close to the laser emission module, the pressing block mounting groove being provided with an internal thread, the pressing block being provided with an external thread matched with the internal thread of the pressing block mounting groove, the pressing block being threadedly connected in the pressing block mounting groove and having a pre-tightening force on the lens module to press and fix the lens module on the connecting seat, the pressing block being provided with a second laser channel along a depth direction of the pressing block mounting groove, the second laser channel being communicated with the lens module mounting groove.

3. The particulate matter concentration measuring apparatus according to claim 2, characterized by, The pressing block is provided with a plurality of wrenching grooves along a circumferential direction of the pressing block in a screwing direction of the pressing block, the wrenching grooves being not communicated with the second laser channel.

4. The particulate matter concentration measuring apparatus according to claim 2, characterized by, The laser emission module comprises: a laser light source; a laser light source mounting seat, the laser light source being mounted on the laser light source mounting seat, the laser light source mounting seat being provided with a pressing block clamping groove at one end close to the connecting seat, the pressing block being partially clamped in the pressing block clamping groove and being sealed by the pressing block clamping groove.

5. The particulate matter concentration measuring device according to claim 1, characterized by, The connecting seat and the laser emission module are connected by a plurality of studs, and a heat insulation interval is formed between the connecting seat and the laser emission module.

6. The particulate matter concentration measuring device according to claim 1, characterized by, The particulate matter concentration measuring device further comprises: a heat insulation block between the connecting seat and the measuring chamber body, the heat insulation block being provided with a third laser channel for laser to pass through, the third laser channel being communicated with the first laser channel, the connecting seat, the heat insulation block and the measuring chamber body being fixedly connected.

7. The particulate matter concentration measuring device according to claim 1, characterized by, The measuring chamber body comprises: a metal shell; at least one heating component on the metal shell for heating the metal shell.

8. The particulate matter concentration measuring device according to claim 1, characterized by, The connecting seat is made of polyformaldehyde resin material.

9. The particulate matter concentration measuring device according to claim 4, characterized by, The laser light source mounting seat is made of polyformaldehyde resin material.

10. The particulate matter concentration measuring device according to claim 6, characterized by The heat insulation block is made of epoxy resin material.

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