Pressure regulating valve and its control system, and smoke concentration measuring device having the same

Abstract

The present application discloses a pressure regulating valve, its control system, and a dust concentration measuring device having the same. The pressure regulating valve includes a valve body and a valve seat disposed within the valve body. The valve seat is provided with a pressure regulating cavity extending along a first linear direction. The pressure regulating cavity has an air inlet end penetrating through the valve seat and an exhaust end disposed opposite to the air inlet end. Both the air inlet end and the exhaust end are communicated with the outside. It further includes an adjusting rod. The adjusting rod is of a hollow structure and is coaxially disposed with the pressure regulating cavity. The adjusting rod has an extending end penetrating from the exhaust end into the pressure regulating cavity. An exhaust gap is formed between the outer peripheral surface of the extending end and the cavity wall of the pressure regulating cavity. The cross-sectional area of the exhaust gap is adjustably arranged. The pressure regulating valve, its control system, and the dust concentration measuring device having the same provided by the present application can make the sample gas channel formed within the regulating valve be a straight-through type, significantly reducing the degree of dust aggregation, and improving the service life of the pressure regulating valve and the measurement accuracy of the dust concentration measuring device.

Description

Technical Field

[0001] The present invention generally relates to the technical field of concentration detection, specifically to the technical field of soot concentration detection, and particularly to a pressure regulating valve and its control system, and a soot concentration measuring device having the same. Background Art

[0002] A soot concentration measuring device is a common measuring instrument used to measure the soot concentration generated after fuel combustion. The soot concentration measuring device includes a sampling pipeline, and the sample gas to be measured is introduced into the measuring device through the sampling pipeline for concentration measurement. A pressure regulating valve needs to be installed in the sampling pipeline, and the pressure regulating valve is used to adjust the air pressure of the sample gas in the sampling pipeline to protect the soot concentration measuring device. Among them, in the soot concentration measuring device, to ensure the accuracy of the soot concentration measurement data, the sampling pipeline should preferably be a straight-through type. When there must be a bent portion in the sampling pipeline, it should also be ensured that the bending radius of the bent portion is more than 10 times the inner diameter of the pipeline to avoid forming a dead bend, thereby ensuring the accuracy of the soot concentration measurement data.

[0003] Since the existing pressure regulating valve relieves pressure by means of throttling or back pressure, there are bent portions in the sample gas channel inside the pressure regulating valve and the bent portions are dead bends. Therefore, soot is likely to accumulate at the dead bends inside the pressure regulating valve, which will not only reduce the measurement accuracy of the soot concentration measuring device, but also reduce the service life of the pressure regulating valve. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a pressure regulating valve and its control system, and a soot concentration measuring device having the same.

[0005] In a first aspect, the present application provides a pressure regulating valve, including a valve body and a valve seat disposed inside the valve body. A pressure regulating cavity extending along a first straight line direction is provided inside the valve seat. The pressure regulating cavity has an air inlet end penetrating through the valve seat and an exhaust end opposite to the air inlet end, and both the air inlet end and the exhaust end are communicated with the outside.

[0006] It further includes an adjusting rod. The adjusting rod is a hollow structure and is coaxially arranged with the pressure regulating cavity. The adjusting rod has an extending end penetrating from the exhaust end into the pressure regulating cavity. An exhaust gap is formed between the outer peripheral surface of the extending end and the cavity wall of the pressure regulating cavity, and the cross-sectional area size of the exhaust gap is adjustable.

[0007] In some preferred embodiments, the adjusting rod is reciprocally movably arranged on the valve body along the first straight line direction to adjust the cross-sectional area size of the exhaust gap. Among the cavity wall of the pressure regulating cavity and the outer peripheral surface of the extending end, at least one includes an inner diameter gradual change section, and the inner diameter of the inner diameter gradual change section gradually increases or decreases along the first straight line direction.

[0008] In some preferred embodiments, the wall of the pressure regulating chamber includes an inner diameter gradually changing section, which is a conical section extending along the first linear direction and the large diameter end of the conical section is arranged away from the air inlet end. The inserting end is a round rod structure, and the diameter value of the outer peripheral surface of the inserting end is above the minimum diameter value of the inner diameter gradually changing section.

[0009] In some preferred embodiments, the exhaust end of the pressure regulating chamber penetrates through the valve seat, and the pressure regulating valve further includes an exhaust pipe arranged on the valve body. One end of the exhaust pipe communicates with the exhaust end, and the other end communicates with the outside.

[0010] In some preferred embodiments, a first guide ring is arranged in the exhaust end, through holes are arranged on the pipe wall of the exhaust pipe, a second guide ring is arranged in the through holes, and the adjusting rod movably passes through the first guide ring and the second guide ring.

[0011] In some preferred embodiments, the pressure regulating valve further includes a heat preservation sleeve, and the heat preservation sleeve is sleeved on the part of the adjusting rod different from the inserting end.

[0012] In some preferred embodiments, the pressure regulating valve further includes a sampling pipe joint, and the sampling pipe joint is installed at the air inlet end.

[0013] In some preferred embodiments, a driving device is further included, and the driving device is drivingly connected to the adjusting rod to drive the adjusting rod to reciprocate along the first linear direction.

[0014] In a second aspect, the present application further provides a control system for a pressure regulating valve, including the pressure regulating valve, and further including:

[0015] A pressure sensor, which is arranged in the pressure regulating chamber and on the side of the inserting end away from the exhaust end, and is used to measure the air pressure value at the position where it is located;

[0016] A processor, which is respectively connected to the pressure sensor and the driving device in the pressure regulating valve, and is used to control the driving device to drive the adjusting rod to move to increase the cross-sectional area of the exhaust gap when the air pressure value exceeds a preset air pressure threshold.

[0017] In a third aspect, the present application further provides a smoke concentration measuring device, including a sampling pipeline and a pressure regulating valve, and the pressure regulating valve is installed in the sampling pipeline.

[0018] The pressure regulating valve, its control system and the smoke concentration measuring device having the same provided by the present application at least have the following beneficial effects:

[0019] 1. The pressure regulating valve provided by the present application and the smoke concentration measuring device having the same achieve the change of the air pressure value of the sample gas inside the regulating valve by adjusting the cross-sectional area of the exhaust gap. At the same time, by setting the pressure regulating cavity and the adjusting rod as a coaxial straight-through structure, the sample gas channel formed inside the regulating valve is a straight-through type, significantly reducing the accumulation degree of smoke and dust, and improving the service life of the pressure regulating valve and the measurement accuracy of the smoke concentration measuring device.

[0020] 2. The control system of the pressure regulating valve provided by the present application, when it is judged that the air pressure value measured by the pressure sensor in the pressure regulating valve exceeds the preset air pressure threshold, automatically controls the driving device to drive the adjusting rod to move to increase the cross-sectional area of the exhaust gap, thereby achieving the purpose of automatic pressure relief and improving the control intelligence of the pressure regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0022] Figure 1 It is a three-dimensional schematic diagram of the pressure regulating valve provided by the embodiment of the present application;

[0023] Figure 2 It is a longitudinal half-sectional view of the pressure regulating valve provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and are not intended to limit the invention. Additionally, it should be noted that only the parts related to the invention are shown in the drawings for the sake of convenience of description.

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0026] Please refer to the attached Figure 1-2 , the present application provides a pressure regulating valve, including a valve body 100 and a valve seat 200 disposed inside the valve body 100. A pressure regulating cavity 210 extending along a first straight line direction is provided inside the valve seat 200. The pressure regulating cavity 210 has an air inlet end 211 penetrating through the valve seat 200 and an exhaust end 212 disposed opposite to the air inlet end 211. Both the air inlet end 211 and the exhaust end 212 are communicated with the outside;

[0027] It further includes an adjusting rod 300. The adjusting rod 300 has a hollow structure and is coaxially arranged with the pressure regulating chamber 210. The adjusting rod 300 has an extending end 310 that penetrates from the exhaust end 212 into the pressure regulating chamber 210. An exhaust gap is formed between the outer peripheral surface of the extending end 310 and the chamber wall of the pressure regulating chamber 210, and the cross-sectional area of the exhaust gap is adjustably arranged.

[0028] In this embodiment, a valve chamber is provided in the valve body 100, and the valve seat 200 is fixedly installed or detachably installed in the valve chamber. A pressure regulating chamber 210 is provided in the valve seat 200, and the pressure regulating chamber 210 extends along a first straight line direction. The pressure regulating chamber 210 has opposite ends, which are an air inlet end 211 for allowing the sample gas to enter the pressure regulating chamber 210 and an exhaust end 212 for allowing the sample gas to discharge from the pressure regulating chamber 210, respectively. The air inlet end 211 penetrates through the valve seat 200 and is communicated with the outside, facilitating the delivery of the sample gas in the sampling pipeline to the air inlet end 211. The sampling pipeline can be directly connected to the exhaust end 212, or the sampling pipeline is indirectly connected to the exhaust end 212. When the sampling pipeline is indirectly connected to the exhaust end 212, it should be ensured that the gas passage between the sampling pipeline and the exhaust end 212 is coaxially arranged with the pressure regulating chamber 210 to avoid bends. The adjusting rod 300 has a hollow structure and is coaxially arranged with the pressure regulating chamber 210. The sample gas to be measured in the pressure regulating chamber 210 is output through the adjusting rod 300 to ensure that the sample gas can flow in a straight line in the pressure regulating valve. The extending end 310 of the adjusting rod 300 penetrates from the exhaust end 212 into the pressure regulating chamber 210 and is located between the air inlet end 211 and the exhaust end 212. An exhaust gap is formed between the outer peripheral surface of the extending end 310 and the chamber wall of the pressure regulating chamber 210. The exhaust gap is used for the purpose of pressure relief. The specific process of realizing pressure relief is as follows: When the pressure regulating valve needs to relieve pressure, the sample gas to be discharged (hereinafter referred to as part of the sample gas) is discharged from the exhaust gap to the exhaust end 212. And since the exhaust end 212 is communicated with the outside, the part of the sample gas entering the exhaust end 212 can be discharged to the outside. The cross-sectional area of the exhaust gap is adjustably arranged, which can realize the adjustment of the discharge flow rate of part of the sample gas, and further realize the purpose of releasing different pressures.

[0029] It should be understood that the first straight line direction herein should be understood as the flowing direction of the sample gas to be measured in the pressure regulating valve during the normal use of the pressure regulating valve. For example, it is the straight line direction shown by the arrow A in the attached Figure 2 figure. The adjustment range of the cross-sectional area of the exhaust gap should be 0 and above. When the cross-sectional area of the exhaust gap is 0, the outer peripheral surface of the extending end 310 and the chamber wall of the pressure regulating chamber 210 are in contact and closed in the circumferential direction. At this time, the pressure regulating valve does not perform pressure relief operation.

[0030] In this embodiment, the air pressure value of the sample gas inside the regulating valve is changed by adjusting the cross-sectional area of the exhaust gap. At the same time, the pressure regulating chamber 210 and the adjusting rod 300 are arranged in a coaxial straight-through structure so that the sample gas channel formed inside the regulating valve is straight-through, significantly reducing the degree of soot accumulation, and improving the service life of the pressure regulating valve and the measurement accuracy of the soot concentration measuring device.

[0031] In some preferred embodiments, the adjusting rod 300 is reciprocally movably arranged on the valve body 100 along the first straight line direction to adjust the cross-sectional area of the exhaust gap. Among the inner wall of the pressure regulating chamber 210 and the outer peripheral surface of the extending end 310, at least one includes an inner diameter gradual change section 213, and the inner diameter of the inner diameter gradual change section 213 gradually increases or decreases along the first straight line direction.

[0032] This embodiment provides a preferred implementation manner for adjusting the cross-sectional area of the exhaust gap. In this embodiment, at least one of the inner wall of the pressure regulating chamber 210 and the outer peripheral surface of the extending end 310 includes an inner diameter gradual change section 213. The gradual change section 213 is an inner diameter gradual change section 213 whose inner diameter gradually increases (hereinafter referred to as an inner diameter gradually expanding section) or gradually decreases (hereinafter referred to as an inner diameter gradually shrinking section) along the first straight line direction, and the adjusting rod 300 is reciprocally movably arranged relative to the valve body 100 along the first straight line direction to adjust the cross-sectional area of the exhaust gap. There are six matching ways between the inner wall of the pressure regulating chamber 210 and the outer peripheral surface of the extending end 310 in this embodiment: First, the inner wall of the pressure regulating chamber 210 includes an inner diameter gradually expanding section, and the adjusting rod 300 is provided with an inner diameter gradually expanding section; Second, the inner wall of the pressure regulating chamber 210 includes an inner diameter gradually expanding section, and the adjusting rod 300 does not have an inner diameter gradual change section 213; Third, the inner wall of the pressure regulating chamber 210 includes an inner diameter gradually expanding section, and the adjusting rod 300 is provided with an inner diameter gradually shrinking section; Fourth, the inner wall of the pressure regulating chamber 210 is provided with an inner diameter gradually shrinking section, and the adjusting rod 300 includes an inner diameter gradually expanding section; Fifth, the inner wall of the pressure regulating chamber 210 is provided with an inner diameter gradually shrinking section, and the adjusting rod 300 includes an inner diameter gradually shrinking section; Sixth, the inner wall of the pressure regulating chamber 210 does not have an inner diameter gradual change section 213, and the adjusting rod 300 also includes an inner diameter gradually expanding section. Among them, the gradual change section 213 is an inner diameter gradual change section 213 whose inner diameter gradually increases or decreases along the first straight line direction. Taking the first way as an example, the inner wall of the pressure regulating chamber 210 includes an inner diameter gradually expanding section. When the adjusting rod 300 moves along the first straight line direction, the extending end 310 of the adjusting rod 300 moves in the gradually expanding section along with the adjusting rod 300, so that the cross-sectional area of the exhaust gap between the inner wall of the pressure regulating chamber 210 and the outer peripheral surface of the extending end 310 gradually increases from 0, and the pressure relief value of the regulating valve also increases accordingly.

[0033] In this embodiment, by providing a tapered section 213 on the chamber wall of the pressure regulating chamber 210 and / or on the outer peripheral surface of the extending end 310, and then moving the adjusting rod 300 in the first linear direction, the cross-sectional area of the exhaust gap can be adjusted. This not only simplifies the structure of the pressure regulating valve, but also makes the adjustment operation of the cross-sectional area of the exhaust gap simple, reducing the manufacturing cost of the pressure regulating section.

[0034] In some preferred embodiments, the chamber wall of the pressure regulating chamber 210 includes an inner diameter tapered section 213. The inner diameter tapered section 213 is a tapered section extending in the first linear direction, and the large diameter end of the tapered section is arranged away from the intake end 211. The extending end 310 has a round rod structure, and the diameter value of the outer peripheral surface of the extending end 310 is above the minimum diameter value of the inner diameter tapered section 213.

[0035] In this preferred embodiment, the chamber wall of the pressure regulating chamber 210 includes an inner diameter tapered section 213, and this inner diameter tapered section 213 is a tapered section. The large diameter end of the tapered section is arranged away from the intake end 211. The extending end 310 has a round rod structure and is coaxially arranged with the tapered section. The diameter value of the outer peripheral surface of the extending end 310 is above the minimum diameter value of the inner diameter tapered section 213, so that the adjustment range of the cross-sectional area of the exhaust gap can be 0 and above. For example, when the side of the outer peripheral surface of the extending end 310 close to the intake end 211 is in complete contact with the chamber wall of the pressure regulating chamber 210, they are in a contact-closed state at this time, and the pressure regulating valve does not perform pressure relief operations at this time. In some other preferred embodiments, the adjusting rod 300 has a hollow round rod structure.

[0036] In this embodiment, the adjustment of the cross-sectional area of the exhaust gap is achieved through the cooperation between the tapered section and the round rod structure, which can further simplify the structure of the pressure regulating valve.

[0037] In some preferred embodiments, the exhaust end 212 of the pressure regulating chamber 210 penetrates through the valve seat 200. The pressure regulating valve further includes an exhaust pipe 900 provided on the valve body 100. One end of the exhaust pipe 900 is communicated with the exhaust end 212, and the other end is communicated to the outside.

[0038] In this embodiment, the pressure regulating chamber 210 penetrates through the valve seat 200 in the first linear direction, with one end being the intake end 211 and the other end being the exhaust end 212. One end of the exhaust pipe 900 is communicated with the exhaust end 212, and the other end is communicated to the outside, for discharging part of the sample gas into the external environment. The end of the exhaust pipe 900 close to the exhaust end 212 is fixedly connected to the exhaust end 212, and the other end can penetrate through the valve body 100 to the outside. In this embodiment, through the exhaust pipe 900, part of the sample gas discharged from the exhaust end 212 can be collected in the pipe and discharged in a directed manner.

[0039] In some preferred embodiments, the valve seat 200 can preferably be a hollow tapered valve seat 200, and the pressure regulating chamber 210 is the inner cavity of the tapered valve seat 200.

[0040] In some preferred embodiments, a first guiding ring 700 is provided inside the exhaust end 212, a through hole is provided on the pipe wall of the exhaust pipe 900, a second guiding ring 800 is provided inside the through hole, and the adjusting rod 300 movably passes through the first guiding ring 700 and the second guiding ring 800.

[0041] In this embodiment, a through hole penetrating the pipe wall is provided on the exhaust end 212, a second guiding ring 800 is provided inside the through hole, and one end of the adjusting rod 300 opposite to the extending end 310 movably passes through the second guiding ring 800. A first guiding ring 700 is provided inside the exhaust end 212, and the extending end 310 enters the pressure regulating chamber 210 through passing through the first guiding ring 700. The first guiding ring 700, the second guiding ring 800 and the adjusting rod 300 are coaxially arranged, which can ensure that the adjusting rod 300 always moves in the first linear direction. In addition, the second guiding ring 800 also has good sealing performance to avoid partial exhaust leakage from the through hole.

[0042] As for the way that part of the sample gas discharged from the exhaust gap to the exhaust end 212 flows into the exhaust pipe 900, it can be, for example but not limited to, providing air permeable holes on the guiding ring to connect the pressure regulating chamber 210 and the inner cavity of the exhaust pipe 900, etc.

[0043] In some preferred embodiments, the exhaust pipe 900 includes a first pipe section 910 extending along the first linear direction and a second pipe section 920 perpendicular to the first pipe section 910. One end of the first pipe section 910 close to the exhaust end 212 is communicated with the exhaust end 212. The second pipe section 920 penetrates through the first pipe section 910 close to the first pipe section 910 into the inner cavity of the first pipe section 910, and the other end penetrates through the valve body 100 to the outside. The through hole is located at one end of the first pipe section 910 away from the intake end 211.

[0044] In some preferred embodiments, the pressure regulating valve further includes a heat preservation sleeve 400, and the heat preservation sleeve 400 is sleeved on the part of the adjusting rod 300 different from the extending end 310.

[0045] In this embodiment, the heat preservation sleeve 400 is sleeved on the part of the adjusting rod 300 different from the extending end 310, and is used to keep the sample gas to be measured in the adjusting rod 300 warm, so as to improve the measurement accuracy of the smoke concentration measuring device. Among them, the heat preservation sleeve 400 can be preferably fixedly sleeved on the adjusting rod 300 to avoid relative movement between the two when the adjusting rod 300 moves. The heat preservation sleeve 400 is, for example but not limited to, a heat preservation cotton sleeve or a vacuum heat preservation sleeve 400, etc.

[0046] When an exhaust pipe 900 is provided at the exhaust end 212 and the adjusting rod 300 passes through a through hole in the exhaust pipe 900, there is a clearance between one end of the heat insulation sleeve 400 close to the intake end 211 and the exhaust pipe 900 to prevent interference in the positions between the heat insulation sleeve 400 and the exhaust pipe 900 when the adjusting rod 300 moves.

[0047] In some preferred embodiments, the pressure regulating valve further includes a sampling pipe joint 600, and the sampling pipe joint 600 is installed at the intake end 211.

[0048] In this embodiment, the sampling pipe joint 600 is fixedly installed on the valve seat 200, and the sampling pipe joint 600 is coaxially arranged with the intake end 211. When the pressure regulating valve is in use, it can be connected to the sampling pipeline through the sampling pipe joint 600. A sealing ring is installed between the sampling pipe joint 600 and the intake end 211 to enhance the sealing performance between the two.

[0049] In some preferred embodiments, it further includes a driving device 500, and the driving device 500 is drivingly connected to the adjusting rod 300 to drive the adjusting rod 300 to reciprocate along the first straight line direction.

[0050] In this embodiment, the driving device 500 is installed on the valve body 100 and is used to drive the adjusting rod 300 to reciprocate along the first straight line direction. The driving device 500 can preferably but is not limited to a cylinder, a hydraulic cylinder, a screw linear driving device 500, etc. Among them, the driving head of the driving device 500 is fixedly connected to the adjusting rod 300.

[0051] In some preferred embodiments, a clamping plate 510 is fixedly connected to the driving head of the driving device 500. The clamping plate 510 has a clamping cavity for firmly clamping the heat insulation sleeve 400 and the adjusting rod 300, and the driving head of the driving device 500 can drive the heat insulation sleeve 400 and the adjusting rod 300 to move through the clamping plate 510.

[0052] In some preferred embodiments, the valve body 100 includes a tubular main body 110 and a support frame 130 fixedly connected to the tubular main body 110, and the driving device 500 is fixedly connected to the support frame 130. The tubular main body 110 includes a pipe body and a cover body 120 covering one end of the pipe body, and the support frame 130 is fixedly connected to the side of the cover body 120 away from the tubular main body 110. The valve seat 200 is located in the inner cavity of the tubular main body 110, the first pipe section 910 of the discharge pipe is located in the inner cavity of the tubular main body 110, and the second pipe section 920 passes through the side wall of the pipe body main body. One end of the adjusting rod 300 away from the extending end 310 passes through the cover body 120. The sampling pipe joint 600 passes through one end of the tubular main body 110 away from the cover body 120.

[0053] The present application also provides a smoke concentration measuring device, including a sampling pipeline and a pressure regulating valve, and the pressure regulating valve is installed in the sampling pipeline. The sampling pipeline includes two pipelines arranged along the conveying direction, namely a first pipeline and a second pipeline. The pressure regulating valve is located between the two pipelines. The sampling pipe joint 600 of the pressure regulating valve is communicated with the end of the first sampling pipeline, and one end of the adjusting rod 300 away from the air inlet end 211 is communicated with the head end of the second pipeline.

[0054] The present application also provides a control system for a pressure regulating valve, including the pressure regulating valve, and further including:

[0055] A pressure sensor, which is arranged in the pressure regulating cavity 210 and on the side where the extending end 310 is away from the exhaust end 212, and is used to measure the air pressure value at the location;

[0056] A processor, which is respectively connected to the pressure sensor and the driving device 500 in the pressure regulating valve, and is used to control the driving device 500 to drive the adjusting rod 300 to move to increase the cross-sectional area of the exhaust gap when the air pressure value exceeds a preset air pressure threshold.

[0057] In this embodiment, both the pressure sensor and the driving device 500 are electrically connected to the processor. The pressure sensor is arranged in the pressure regulating cavity 210 and on the side where the extending end 310 is away from the exhaust end 212, and is used to measure the air pressure value at this position. When the air pressure value measured by the pressure sensor exceeds the preset air pressure threshold, at this time, the pressure regulating valve needs to perform pressure relief treatment, and the controller controls the driving device 500 to drive the adjusting rod 300 to move to increase the cross-sectional area of the exhaust gap, so as to realize pressure relief to the set value.

[0058] In some preferred embodiments, the processor obtains the displacement value of the adjusting rod 300 according to the difference between the measured air pressure value and the air pressure threshold according to a preset matching rule, and then controls the driving device 500 to drive the adjusting rod 300 to move the above displacement value, so that the regulating valve can perform accurate pressure relief. Among them, the matching rule is a single positive mapping function relationship between the difference between the measured air pressure value and the air pressure threshold and the displacement value of the adjusting rod 300.

[0059] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position relationship based on the attached Figure 2The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0060] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A pressure regulating valve, characterized in that, It comprises a valve body and a valve seat arranged in the valve body, wherein a pressure regulating chamber extending along a first straight line direction is arranged in the valve seat, and the pressure regulating chamber has an air inlet end arranged through the valve seat and an air outlet end arranged opposite to the air inlet end, and both the air inlet end and the air outlet end are arranged in communication with the outside; It also includes an adjusting rod, which is a hollow structure and is coaxially arranged with the pressure regulating chamber, and has an extending end extending from the exhaust end into the pressure regulating chamber, and an exhaust gap is formed between the outer peripheral surface of the extending end and the cavity wall of the pressure regulating chamber, and the cross-sectional area of ​​the exhaust gap can be adjusted; The exhaust end is butt-jointed with the sampling pipeline so that the gas passage between the sampling pipeline and the exhaust end is coaxially arranged with the pressure regulating chamber; The adjusting rod is reciprocally movable on the valve body along the first straight direction to adjust the cross-sectional area of ​​the exhaust gap, wherein at least one of the cavity wall of the pressure regulating cavity and the outer peripheral surface of the extending end includes an inner diameter gradient section, and the inner diameter of the inner diameter gradient section gradually increases or decreases along the first straight direction.

2. The pressure regulating valve according to claim 1, characterized in that, The cavity wall of the pressure regulating cavity includes the inner diameter gradient section, which is a conical section extending along the first straight line direction and the large diameter end of the conical section is arranged away from the air inlet end, the insertion end is a round rod structure, and the diameter value of the outer peripheral surface of the insertion end is greater than the minimum diameter value of the inner diameter gradient section.

3. The pressure regulating valve according to claim 1, characterized in that, The exhaust end of the pressure regulating chamber is arranged through the valve seat, and the pressure regulating valve also includes an exhaust pipe arranged on the valve body, one end of the exhaust pipe is connected to the exhaust end, and the other end is connected to the outside.

4. The pressure regulating valve according to claim 3, wherein A first guide ring is provided in the exhaust end, a through hole is provided on the pipe wall of the exhaust pipe, a second guide ring is provided in the through hole, the first guide ring and the second guide ring are coaxially arranged, and the adjustment rod movably passes through the first guide ring and the second guide ring.

5. The pressure regulating valve according to claim 1, wherein It also includes a heat-insulating sleeve, which is arranged on the portion of the adjusting rod different from the extending end.

6. The pressure regulating valve according to claim 1, characterized in that, It also includes a sample injection pipe joint, which is installed at the air inlet end.

7. The pressure regulating valve according to claim 1, wherein It also includes a driving device, which is drivingly connected to the adjusting rod to drive the adjusting rod to reciprocate along the first straight line direction.

8. A control system for a pressure regulating valve, characterized in that, The pressure regulating valve according to any one of claims 1 to 7 further comprises: A pressure sensor is disposed in the pressure regulating chamber and is located at a side of the insertion end away from the exhaust end, and is used to measure the air pressure value at the location; A processor is connected to the pressure sensor and the driving device in the pressure regulating valve respectively, and is used to control the driving device to drive the adjusting rod to move to increase the cross-sectional area of ​​the exhaust gap when the air pressure value exceeds a preset air pressure threshold.

9. A device for measuring the concentration of soot and dust, characterized in that, It comprises a sampling pipeline and a pressure regulating valve as claimed in any one of claims 1 to 7, wherein the pressure regulating valve is installed in the sampling pipeline.

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