A heating and dehumidification sampling head

Abstract

The present invention discloses a heating and dehumidifying sampling head, comprising a rear end portion forming a rear end gas path and a front end portion forming a front end gas path, wherein a gas deflection separation portion is arranged between the rear end gas path and the front end gas path, so that the gas entering from the front end gas path enters the rear end gas path through an eccentric gas path after deflection and rebound and then is discharged, and the outer wall of the air pipe of the rear end gas path is covered by a heating device; a discharge hole is opened on the side wall of the gas deflection separation portion to discharge liquid water and / or particulate matter separated from the gas after deflection and rebound. The present invention ensures that there is no liquid water in the gas entering the detection device, and ensures the accuracy of the gas particulate matter sensor device in detecting gas particulate matter.

Description

Technical Field

[0001] The invention relates to the technical field of particle detection, and in particular to a heating and dehumidifying sampling head for particle detection. Background Art

[0002] In order to sample particulate matter, particulate matter detection equipment usually uses a sampler and an air pump to sample gas into the detection equipment for detection. However, when the existing sampler is sampling the gas, if there is liquid water mist in the gas, the liquid water mist will also enter the detection equipment. The particulate matter sensor will identify the liquid water mist as particulate matter, which will greatly affect the accuracy of the detection data of the detection equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a heating and dehumidification sampling head for particulate matter detection in response to the technical defects existing in the prior art, which can quickly heat the liquid water in the gas entering the rear-end gas path to form gaseous water, thereby ensuring that there is no liquid water in the gas entering the detection equipment, thereby ensuring the accuracy of the detection.

[0004] The technical solution adopted to achieve the purpose of the present invention is:

[0005] A heating and dehumidification sampling head comprises a rear end portion forming a rear end gas path and a front end portion forming a front end gas path, wherein a gas deflection separation portion is arranged between the rear end gas path and the front end gas path, so that the gas entering from the front end gas path enters the rear end gas path through an eccentric gas path after deflection and rebound, and then is discharged, and the outer wall of the air pipe of the rear end gas path is covered by a heating device; a discharge hole is opened on the side wall of the gas deflection separation portion to discharge liquid water and / or particulate matter separated from the gas after deflection and rebound.

[0006] Preferably, the front end of the front end gas path is connected to a front end air inlet portion, which is composed of a front end head with an air inlet hole in the center, an outer baffle plate connected to the front end head, and a protective plate arranged inside the gas entry channel between the outer baffle plate and the front end head for filtering air foreign matter to prevent the front end gas path from entering. The outer edge of the outer baffle plate extends radially outward relative to the front end outer edge of the front end head, so that an annular gas inlet is formed between their outer edges.

[0007] Preferably, the protective plate is a perforated plate, the center of which forms an air inlet hole corresponding to the air inlet hole of the front end head, and a plurality of filter holes for filtering are arranged in an annular shape on the outer side of the air inlet hole, and the filter holes are arranged corresponding to the annular gas inlet.

[0008] Preferably, the air inlet side of the air inlet hole of the front end head has a flared portion for introducing the gas to be measured, the through hole portion connected to the lower part of the flared portion is connected to the front end gas path, and the aperture of the gas inlet hole in the center of the orifice plate is larger than the flared diameter of the flared portion.

[0009] Preferably, the front end portion forming the front end gas path has a first cylindrical connecting portion arranged at the front end and a second cylindrical connecting portion arranged at the rear end, the first cylindrical connecting portion is detachably connected to the through-hole portion, the second cylindrical connecting portion is connected to the corresponding portion of the gas baffle separation portion, and the gas outlet end of the front end gas path is located at the center of the first cylindrical connecting portion and is directly opposite to the rebound plane of the gas baffle separation portion;

[0010] An eccentric gas path is provided on the radial outer side of the rebound plane for guiding the gas rebounding upward to enter the rear end gas downward, and the eccentric gas path is parallel to the axis of the gas outlet end of the front end gas path;

[0011] The side of the rebound plane pointing to the discharge hole forms a sedimentation trough arranged in a stepped manner from high to low, and the discharge hole is connected to the sedimentation trough to discharge the liquid water and / or particulate matter deposited in the sedimentation trough.

[0012] Preferably, the heating device comprises a heating wire, a tape for fixing the heating wire on the outer wall of the rear end gas path, and a heat-insulating layer arranged on the outer side of the tape.

[0013] Preferably, a protective tube is provided on the outside of the air pipe forming the rear-end air circuit, which is arranged coaxially with the straight tube and forms an annular space with the rear-end air circuit to form a quick connector at the end of the straight tube forming the rear-end air circuit.

[0014] Preferably, the gas deflection separation part is connected to the rear-end gas path through an intermediate connecting piece, a gas through hole is provided at the center of the intermediate connecting piece, the gas through hole protrudes downward to form a protruding part to connect with the rear-end gas path, and the protective tube has a pipe mouth which is detachably connected to the corresponding connecting piece of the intermediate connecting piece.

[0015] Preferably, the discharge hole is connected to the storage container via a radially arranged discharge pipeline; the storage container is composed of a cover body and a container body detachably connected to the cover body, and the side wall opening of the cover body is connected to the discharge pipeline.

[0016] Preferably, the front-end gas path and the rear-end gas path are arranged coaxially, and the gas deflection separation part rebounds and deflects the incoming gas so that the gas flows downwardly into the rear-end gas path along the radially outer channel of the front-end gas path.

[0017] The heating and dehumidification sampling head of the present invention adopts a modular structure, which is convenient for assembly and production. Moreover, since the rear-end gas path is provided with a heating device, the rear-end gas path can be quickly heated, so that the liquid water in the gas entering the rear-end gas path is quickly heated to form gaseous water, thereby ensuring that there is no liquid water in the gas entering the detection equipment, thereby ensuring the accuracy of the detection.

[0018] In addition, by providing a gas deflection separation part, liquid water in the incoming gas to be tested can be initially removed and large-diameter particles in the gas to be tested can be discharged, further ensuring the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 AA is a cross-sectional schematic diagram of a heating and dehumidification sampling head according to an embodiment of the present invention;

[0020] Figure 2 It is a side structural diagram of a heating and dehumidification sampling head according to an embodiment of the present invention;

[0021] Figure 3 This is a front view of the heating and dehumidification sampling head according to an embodiment of the present invention;

[0022] Figure 4 It is an axonometric diagram of a heating and dehumidification sampling head according to an embodiment of the present invention;

[0023] Figure 5 This is a bottom view of the heating and dehumidification sampling head according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 As shown, the heating and dehumidification sampling head of the embodiment of the present invention includes a rear end portion forming a rear end gas path 13 and a front end portion forming a front end gas path 1, and a gas deflection separation portion 7 is arranged between the rear end gas path and the front end gas path, so that the gas entering from the front end gas path enters the rear end gas path through the eccentric gas path 3 after deflection and rebound, and then is discharged, and the outer wall of the air pipe of the rear end gas path is covered by a heating device; a discharge hole is opened on the side wall of the gas deflection separation portion to discharge liquid water and / or particulate matter separated from the gas after deflection and rebound.

[0026] Exemplarily, the front end of the front end gas path may be connected to a front end air inlet portion, which may be composed of a front end head 50 with a T-shaped structure having an air inlet hole in the center, an outer baffle plate 52 connected to the front end head, and a protective plate 5 arranged inside the gas entry channel between the outer baffle plate and the front end head for filtering air foreign matter to prevent the front end gas path from entering. The outer edge of the outer baffle plate extends radially outward relative to the front end outer edge of the front end head to form an umbrella-shaped structure, covering the front end head 50 with a T-shaped structure from above, so that a ring-shaped gas inlet can be formed between their outer edges to facilitate the gas to enter the interior of the sampling head after filtration.

[0027] Exemplarily, the front end head 50 and the outer baffle plate may be connected by bolts, and the bolts pass through the protective plate 5 to fix the protective plate between the front end head and the outer baffle plate.

[0028] Among them, the protective plate 5 can be a perforated plate, and the center of the perforated plate forms an air inlet hole corresponding to the air inlet hole of the front end head. The outer side of the air inlet hole is annularly arranged with multiple circles of filter holes for filtering. The filter holes are arranged corresponding to the annular gas inlet, so that it is convenient for external gas to enter through the annular gas inlet, and then pass through the filter holes to enter the gas entry channel between the outer baffle and the front end head. After that, the air inlet formed in the center of the orifice plate flows to the air inlet hole in the center of the front end head 50, and enters the front end gas path 1 through the air inlet hole.

[0029] Among them, the air inlet side of the air inlet hole of the front end head 50, for example, can be a flared portion for introducing the gas to be tested to facilitate the entry of the gas, and the through-hole portion 51 connected to the lower part of the flared portion is connected to the front end gas path 1, and the aperture of the gas inlet hole in the center of the orifice plate is larger than the flared diameter of the flared portion.

[0030] Among them, exemplarily, the front end portion forming the front end gas path 1 can be an integrated structural part as a whole, which can have a first cylindrical connecting portion arranged at the front end and a second cylindrical connecting portion arranged at the rear end and having a diameter larger than the first cylindrical connecting portion, and is generally an inverted T-shaped structure when viewed from the outside, wherein the first cylindrical connecting portion is detachably connected to the through-hole portion of the front end head, and the second cylindrical connecting portion is connected to the corresponding portion of the gas deflection separation portion 7, and the gas outlet end of the front end gas path is located at the center of the first cylindrical connecting portion, and is opposite to the rebound plane 2 of the gas deflection separation portion.

[0031] Exemplarily, an eccentric gas path 3 for guiding the gas rebounding upward to enter the rear end gas downward is provided on the radial outer side of the rebound plane 2, and the eccentric gas path 3 is parallel to the axis of the gas outlet end of the front end gas path.

[0032] Exemplarily, the side of the rebound plane 2 pointing to the discharge hole forms a sedimentation trough formed by a stepped arrangement from high to low, and the discharge hole is connected to the sedimentation trough to discharge the liquid water and / or particulate matter deposited in the sedimentation trough.

[0033] The first cylindrical connecting portion and the second cylindrical connecting portion may be threadedly connected to achieve threaded connection of corresponding components, which is convenient for assembly, production, or maintenance.

[0034] Exemplarily, the gas deflection separation portion 7 is an integrated component, consisting of an eccentric gas path 3, a rebound surface 2, a sedimentation groove, and a discharge hole. It has an external threaded interface on the upper part and an internal threaded interface on the lower part. It is connected on the non-center side through the eccentric gas path to control the incoming gas to rebound and rise at the center position, and then flow out from the eccentric gas path to the rear end gas path 13 to be heated and discharged.

[0035] Among them, exemplarily, the discharge hole can be connected to the storage container 6 through a radially arranged discharge pipeline 4; the storage container can exemplarily be composed of a cover body and a container body detachably connected to the cover body, and the side wall opening of the cover body is connected to the discharge pipeline to facilitate the collection of liquid water and / or large-diameter particles discharged by the gas deflection separation part.

[0036] Among them, exemplarily, the heating device can be heated by using a heating wire 8. When using a heating wire, the heating wire can be wound around the outside of the pipe wall of the rear end gas path 13 in a spring shape, and then the heating wire is fixed to the outer wall of the rear end gas path with a high temperature resistant tape 8. In addition, a heat preservation layer 10 can be set on the outside of the tape to prevent heat loss, so as to achieve a better heating effect. For example, an asbestos insulation layer or other insulation layers can be used, and the specific ones are not limited. The high temperature resistant tape 8, exemplarily, can be a tape made of PET or PI material, which is determined by the heating cut-off temperature. The PI material has better high temperature resistance.

[0037] Among them, the heating wire is connected to the temperature control switch 11, and the heating is controlled by the temperature control switch. When heated to the specified temperature, the circuit is automatically disconnected. The temperature control switch 11 can be arranged at the lower part of the rear end gas path, on the outer wall near the exhaust side, and can be wrapped by an insulation layer on the outside.

[0038] Exemplarily, a protective tube 14 may be provided on the outside of the air pipe forming the rear end air path 13 , and may be coaxially arranged with the air pipe and form an annular space between the protective tube 14 and the rear end air path.

[0039] Wherein, illustratively, in order to facilitate the quick connection of the air intake pipe of the air pump, the end of the straight air pipe forming the rear end air path can be connected to a quick connector 12 to facilitate the connection with the air intake pipe of the air pump. The quick connector 12 and the end of the straight air pipe can be connected using an existing well-known threaded structure for easy use. Wherein, the end of the protective tube also has a limiting tube 15 to limit the air intake pipe led out of the air pump, and the limiting tube is fixed on an external threaded component, and the external threaded component is threadedly connected to the end of the protective tube.

[0040] The gas deflection separation part 7 and the rear-end gas path 13 are illustratively connected through an intermediate connector 16 of an integrated structure. The center of the intermediate connector 16 has a gas through hole, and the gas through hole protrudes downward to form a protruding part to connect with the rear-end gas path 13. It can be a threaded connection to ensure the concentricity of the gas through hole and the rear-end gas path. The protection tube 14 has a pipe opening that is detachably connected to the corresponding connection part of the intermediate connector 16. Exemplarily, the upper part of the intermediate connector 16 has an external thread, and the lower part has an internal thread, which is connected to the threaded opening of the gas deflection separation part through the external thread of the upper part, and connected to the external threaded opening of the upper end of the protection tube through the internal thread of the lower part.

[0041] Among them, illustratively, it is preferred that the front-end gas path and the rear-end gas path are arranged coaxially, and the gas deflection separation part rebounds and deflects the incoming gas so that the gas flows downward into the rear-end gas path 13 along the radially outer channel of the front-end gas path 1 through the eccentric gas path 3.

[0042] When in use, the lower end of the sampling head needs to be connected to an air pump to extract the gas; the gas to be tested first enters the sampling head through the protective plate 5, the function of the protective plate is to prevent large foreign matter, flying catkins, etc. from entering the sampler. After the gas to be tested enters the baffle separation chamber through the front gas path 1, it will impact the rebound plane 2, and after rebounding, it will enter the eccentric gas path 3. During the flow of the gas, large-diameter particles and part of the liquid water in the gas to be tested will remain on the rebound plane 2, and then enter the storage container for storage through the connected radially arranged discharge pipeline 4.

[0043] Since the outer wall of the rear-end gas path is wrapped with a heating wire, the heating wire heats the lower gas path after power is turned on. In this way, the liquid water mist in the gas flowing through the lower gas path can be heated and changed from liquid water to gaseous water, thereby eliminating the liquid water in the gas to be tested and making the liquid water disappear, thereby eliminating the technical problem that the particle sensor in the detection equipment will identify liquid water as particle matter, resulting in excessive detection values ​​and affecting the accuracy of the detection data.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Heating and dehumidifying sampling head, characterized in that: It comprises a rear end portion forming a rear end gas path and a front end portion forming a front end gas path, a gas deflection separation portion is arranged between the rear end gas path and the front end gas path, so that the gas entering from the front end gas path enters the rear end gas path through the eccentric gas path after deflection and rebound and then is discharged, and the outer wall of the air pipe of the rear end gas path is covered by a heating device; a discharge hole is opened on the side wall of the gas deflection separation portion to discharge liquid water and / or particulate matter separated from the gas after deflection and rebound; the gas outlet end of the front end gas path is directly opposite to the rebound plane of the gas deflection separation portion; a radial outer side of the rebound plane is provided with a hole for guiding the gas rebounding upward to enter the rear end gas path downward. An eccentric gas path, which is parallel to the axis of the gas outlet end of the front-end gas path; the rebound plane points to one side of the discharge hole to form a sedimentation trough formed by a stepped arrangement from high to low, and the discharge hole is connected to the sedimentation trough to discharge liquid water and / or particulate matter deposited in the sedimentation trough; the heating device includes a heating wire, a tape for fixing the heating wire on the outer wall of the rear-end gas path, and an insulation layer arranged on the outside of the tape; a protective tube is arranged on the outside of the straight pipe forming the rear-end gas path, which is coaxially arranged with the straight pipe and forms an annular space with the rear-end gas path to form a quick connector at the end of the straight pipe of the rear-end gas path.

2. The heating and dehumidification sampling head according to claim 1, characterized in that: The front end of the front end gas path is connected to a front end air intake portion, which is composed of a front end head with an air intake hole in the center, an outer baffle plate connected to the front end head, and a protective plate arranged inside the gas entry channel between the outer baffle plate and the front end head for filtering air foreign matter to prevent entering the front end gas path. The outer edge of the outer baffle plate extends radially outward relative to the front end outer edge of the front end head, so that an annular gas inlet is formed between their outer edges.

3. The heating and dehumidification sampling head according to claim 2, characterized in that: The protective plate adopts a perforated plate, the center of which forms an air inlet hole corresponding to the air inlet hole of the front end head, and a plurality of filter holes for filtering are arranged in a ring shape on the outer side of the air inlet hole, and the filter holes are arranged corresponding to the annular gas inlet.

4. The heating and dehumidification sampling head according to claim 3, characterized in that: The air inlet side of the front end head has a flared portion for introducing the gas to be measured, the lower part of the flared portion is connected to the front end gas path, and the aperture of the gas inlet hole in the center of the orifice plate is larger than the flared diameter of the flared portion.

5. The heating and dehumidification sampling head according to claim 4, characterized in that: The front end portion forming the front end gas path has a first cylindrical connecting portion arranged at the front end and a second cylindrical connecting portion arranged at the rear end, the first cylindrical connecting portion is detachably connected to the through-hole portion, the second cylindrical connecting portion is connected to the corresponding portion of the gas deflection separation portion, and the gas outlet end of the front end gas path is located at the center of the first cylindrical connecting portion.

6. The heating and dehumidification sampling head according to claim 1, characterized in that: The gas deflection separation part is connected to the rear-end gas path through an intermediate connecting piece. A gas through hole is provided at the center of the intermediate connecting piece. The gas through hole protrudes downward to form a protruding part to connect with the rear-end gas path. The protective tube has a pipe mouth which is detachably connected to the corresponding connecting piece of the intermediate connecting piece.

7. The heating and dehumidification sampling head according to claim 1, characterized in that: The discharge hole is connected to the storage container through a radially arranged discharge pipeline; the storage container is composed of a cover body and a container body detachably connected to the cover body, and the side wall opening of the cover body is connected to the discharge pipeline.

8. The heating and dehumidification sampling head according to claim 1, characterized in that: The front end gas path and the rear end gas path are arranged coaxially, and the gas deflection separation part rebounds and deflects the incoming gas so that the gas flows downward into the rear end gas path along the radial outer channel of the front end gas path.

Images