Gas path shunt joint

Abstract

The utility model discloses a gas path shunt joint, which comprises a cylindrical connecting pipe section and a flaring-shaped shunt cone arranged at the downstream end of the connecting pipe section, a shunt cavity is arranged in the shunt cone, and a shunt cone axially extending towards a pipe orifice of the connecting pipe section is arranged at the bottom of the shunt cone. The upstream tip of the flow dividing cone corresponds to the center of the connecting pipe section, a plurality of flow dividing connecting screw holes evenly distributed around the center circumference of the connecting pipe section are formed in the bottom of the flow dividing cavity, and flow dividing pipe connectors are connected to the flow dividing connecting screw holes in a threaded mode. In this way, the calibration requirement of the particulate matter cutter can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of particle detection, in particular to an air path diversion joint. Background Art

[0002] In the field of particulate matter detection technology, it is often necessary to divert the gas, and the gas path after diversion must ensure the same working conditions as much as possible. For example, when detecting the concentration of particulate matter contained in the sampled gas, a particulate dust concentration detection instrument is required, and when detecting the concentration of particles of a specific particle size, a particle cutter is required, such as a PM2.5 particle cutter or a PM10 particle cutter. The cutting efficiency of the instrument and the cutter needs to be calibrated.

[0003] When calibrating the cutting efficiency of the cutter, it is necessary to detect the particle concentration upstream and downstream of the cutter to calculate the cutting efficiency. The current method of detecting the upstream concentration and the downstream concentration is to connect a chamber upstream of the cutter, and the chamber is connected to a calibrated total instrument to detect the total particle concentration in the chamber, and the downstream pipe of the cutter is connected to a sampling pipe, and is respectively connected to a calibrated sub-meter to detect the particle concentration after the cutter cuts. At the same time, the downstream pipe of the cutter also needs to be connected to a vacuum pump, and the vacuum pump is used to evacuate the particles in the chamber into the cutter. The above connection method will cause turbulence in the gas in the chamber, making it impossible to determine the consistency of the dust-laden gas entering the total instrument and the dust-laden gas entering the cutter. Therefore, how to ensure the consistency of the dust-laden gas sampled by the total instrument and the dust-laden gas of the cutter is a difficulty in the industry. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an air path diverter joint, which can ensure that the air path after diversion is very uniform, thus meeting the calibration requirements of the particle cutter.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: an air path diversion joint, comprising a cylindrical connecting pipe section and a diversion cone cylinder arranged at the downstream end of the connecting pipe section in an expanded shape, a diversion chamber is arranged inside the diversion cone cylinder, and a diversion cone extending axially toward the pipe mouth of the connecting pipe section is provided at the bottom of the diversion cone cylinder, the upstream tip of the diversion cone corresponds to the center of the connecting pipe section, and a plurality of diversion connection screw holes evenly distributed around the center circumference of the connecting pipe section are provided at the bottom of the diversion chamber, and the diversion pipe joint is threadedly connected to the diversion connection screw holes.

[0006] As a preferred solution, the conical surface of the diverter cone is provided with guide grooves that are in one-to-one correspondence with the diverter connection screw holes, and the guide grooves extend along the conical surface of the diverter cone.

[0007] As a preferred solution, the guide groove is an arc-shaped groove, and the arc-shaped contour of the arc-shaped groove completely coincides with the diversion connection screw hole.

[0008] As a preferred solution, the number of the diversion connection screw holes is an even number.

[0009] As a preferred solution, the diversion connection screw hole includes a threaded hole section and a straight section passing through the diversion cone, and the diameter of the threaded hole section is larger than the straight section to form a joint positioning step.

[0010] As a preferred solution, the connecting pipe section is provided with a locking structure for facilitating locking of the air intake pipe inserted into the connecting pipe section.

[0011] As a preferred solution, the locking structure includes a plurality of radial locking screw holes provided on the connecting pipe section, and the inner threads of the radial locking screw holes are connected with tightening bolts for radially tightening the air intake pipe.

[0012] As a preferred solution, a pipe end positioning step for conveniently positioning the end of the air inlet pipe is provided in the connecting pipe section, and an annular sealing ring groove is also provided in the connecting pipe section.

[0013] As a preferred solution, the bottom of the diverter cone is provided with an upwardly concave groove.

[0014] After adopting the above technical solution, the effect of the utility model is as follows: since the gas path diverter joint includes a cylindrical connecting pipe section and a diverter cone arranged at the downstream end of the connecting pipe section in an expanded shape, a diverter chamber is arranged inside the diverter cone, and a diverter cone extending axially toward the pipe mouth of the connecting pipe section is arranged at the bottom of the diverter cone, the upstream tip of the diverter cone corresponds to the center of the connecting pipe section, and a plurality of diverter connection screw holes uniformly distributed around the central circumference of the connecting pipe section are arranged at the bottom of the diverter chamber, and the diverter connection screw holes are threadedly connected to the diverter pipe joint. Therefore, after the gas path diverter joint is connected to the air inlet pipe, the diverter connection screw holes are connected to the diverter. Pipe joints, then one of the two diversion pipe joints is connected to the cutter and the other is connected to the standard instrument. In this way, since the diversion cone corresponds to the center of the connecting pipe section, the dust-laden airflow will be evenly diverted by the diversion cone to each diversion connection screw hole after entering, and the diversion connection screw holes are evenly arranged, so the state of the dust-laden gas flowing out of each diversion connection screw hole is consistent. Therefore, the state of the dust-laden gas passing through the cutter and the dust-laden gas entering the standard instrument are consistent, and the particle concentration is also the same, so the total concentration test result upstream of the cutter can be guaranteed to be accurate, so that the cutting efficiency calibration or calibration will be more accurate and the error will be smaller.

[0015] Furthermore, since a guide groove is provided on the conical surface of the diverter cone and is connected to the diverter connection screw hole in a one-to-one correspondence, the guide groove extends along the conical surface of the diverter cone, and the guide groove is an arc-shaped groove. The arc profile of the arc-shaped groove completely coincides with the diverter connection screw hole, so that the gas can enter the diverter connection screw hole more smoothly through the guide groove, and the arc profile of the arc-shaped groove completely coincides with the diverter connection screw hole, which can ensure the smoothness of the gas and the consistency of the gas flow.

[0016] Furthermore, since the number of the shunt connection screw holes is an even number, the cutter and the instrument can be connected in two centrally symmetrical shunt connection holes, which results in a smaller error.

[0017] Since the diversion connection screw hole includes a threaded hole section and a straight section passing through the diversion cone, the diameter of the threaded hole section is larger than the straight section to form a joint positioning step, so that the diversion pipe joint can contact the joint positioning step when screwed in, thereby ensuring that the state of each diversion pipe joint is also consistent, thereby further ensuring consistency.

[0018] Furthermore, since the bottom of the diverter cone is provided with an upwardly concave groove, the weight of the gas path diverter joint can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of another angle of the embodiment of the utility model;

[0022] Figure 3 yes Figure 1 Bottom view of

[0023] Figure 4 yes Figure 1 A top view of

[0024] Figure 5 yes Figure 1 The main view;

[0025] Figure 6 yes Figure 5 Sectional view along AA;

[0026] Figure 7 yes Figure 5 Cross-sectional view along BB;

[0027] Figure 8 yes Figure 5 A sectional perspective view along BB;

[0028] Figure 9 It is a partial cross-sectional view of an embodiment of the present utility model including a diverter pipe joint;

[0029] In the attached figure: 1. Connecting pipe section; 2. Diverter cone; 3. Diverter chamber; 4. Diverter cone; 5. Diverter connecting screw hole; 51. Threaded hole section; 52. Through straight section; 53. Joint positioning step; 6. Diverter pipe joint; 7. Guide groove; 8. Radial locking screw hole; 9. Pipe end positioning step; 10. Annular sealing ring groove; 11. Recessed groove; 12. Inlet pipe. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below through specific embodiments.

[0031] like Figure 1-9 As shown, a gas path diverter joint includes a cylindrical connecting pipe section 1 and a diverter cone 2 with an expanded opening disposed at the downstream end of the connecting pipe section 1. The diverter cone 2 has a diverter chamber 3 disposed therein. The bottom of the diverter cone 2 has a diverter cone 4 extending axially toward the pipe opening of the connecting pipe section 1. The upstream tip of the diverter cone 4 corresponds to the center of the connecting pipe section 1. The bottom of the diverter chamber 3 has a plurality of diverter connection screw holes 5 evenly distributed around the central circumference of the connecting pipe section 1. The diverter connection screw holes 5 are threadedly connected to a diverter pipe joint 6. At least two of the diverter connection screw holes 5 are connected to the diverter pipe joint 6.

[0032] In this embodiment, two diverter connection screw holes 5 are connected to a diverter pipe joint 6. The diverter cone 4 is provided with a flow guide groove 7 on its conical surface, corresponding one-to-one with the diverter connection screw holes 5. The flow guide groove 7 extends along the conical surface of the diverter cone 4. The flow guide groove 7 is an arc-shaped groove, and the arc profile of the arc groove completely overlaps with the diverter connection screw holes 5. The bottom of the diverter cone 4 is provided with an upwardly concave groove 11.

[0033] Connecting pipe section 1 is provided with a locking structure for conveniently locking the intake pipe inserted into it. The locking structure includes several radial locking screw holes 8 provided on connecting pipe section 1. These radial locking screw holes 8 are threadedly connected to tightening bolts that radially tighten the intake pipe. Connecting pipe section 1 is provided with a pipe end positioning step 9 for conveniently positioning the end of the intake pipe. An annular sealing ring groove 10 is also provided within the connecting pipe section 1. The tightening bolts, annular sealing ring groove 10, and other components are omitted in some drawings.

[0034] In this embodiment, the number of the shunt connection screw holes 5 is an even number, and the shunt connection screw holes 5 include a threaded hole section 51 and a straight section 52 that passes through the shunt cone 2. The diameter of the threaded hole section 51 is larger than the straight section 52, forming a joint positioning step 53. Of course, the number of the shunt connection screw holes 5 can also be set to an odd number as needed.

[0035] When in use, the connecting pipe section 1 of the air path diversion joint is connected to the air inlet pipe 12, and the two diversion connecting screw holes 5 are respectively connected to the two diversion pipe joints 6, one of which is connected to the cutter, and the other is connected to the standard instrument. The cutter and the instrument can be connected in two centrally symmetrical diversion connecting holes. Since the diversion cone 4 corresponds to the center of the connecting pipe section 1, the dust-laden airflow will be evenly diverted by the diversion cone 4 to each diversion connecting screw hole 5 after entering, and the diversion connecting screw holes 5 are evenly arranged, so that the state of the dust-laden gas flowing out of each diversion connecting screw hole 5 is consistent, and the diversion pipe joint 6 contacts the joint positioning step 53 when screwed in, and the state of each diversion pipe joint 6 is also consistent. Therefore, the state of the dust-laden gas passing through the cutter is consistent with the state of the dust-laden gas entering the standard instrument, and the particle concentration is also the same, so that the detection results can be guaranteed to be accurate.

[0036] The air circuit system, actuators such as servo motors, gear transmission mechanisms, and lead screw and nut mechanisms mentioned in this embodiment are all current conventional technologies. The specific structures and principles and other designs of the cylinders, motors, and other transmission mechanisms are disclosed in detail in the "Mechanical Design Manual, Fifth Edition", the 28th printing of the fifth edition in Beijing in April 2008, which belongs to the existing technology and its structure is clear. The SMC training textbook "Modern Practical Pneumatic Technology, 3rd Edition" published by the Machinery Industry Press on August 1, 2008 discloses in detail the vacuum components, gas circuits, and program control, indicating that the air circuit structure in this embodiment is also existing technology and is clear. The book "Motor Drive and Speed ​​Regulation" published by the Chemical Industry Press on July 1, 2015 also introduces the control of the motor and the travel switch in detail. Therefore, the circuit and air circuit connections are clear.

[0037] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention, without departing from the spirit of the present invention, should fall within the scope of protection defined in the claims of the present invention.

Claims

1. A gas path diversion joint, characterized by: It includes a cylindrical connecting pipe section and a diverter cone cylinder with an expanded mouth arranged at the downstream end of the connecting pipe section. A diverter chamber is arranged inside the diverter cone cylinder. The bottom of the diverter cone cylinder is provided with a diverter cone extending axially toward the pipe mouth of the connecting pipe section. The upstream tip of the diverter cone corresponds to the center of the connecting pipe section. The bottom of the diverter chamber is provided with a plurality of diverter connection screw holes evenly distributed around the central circumference of the connecting pipe section. The diverter connection screw holes are threadedly connected to the diverter pipe joint.

2. The gas path diverter joint according to claim 1, characterized in that: The conical surface of the diverter cone is provided with a guide groove which is in one-to-one correspondence with the diverter connection screw hole, and the guide groove extends along the conical surface of the diverter cone.

3. The gas path diversion joint according to claim 2, characterized in that: The flow guide groove is an arc-shaped groove, and the arc-shaped contour of the arc-shaped groove completely coincides with the diversion connection screw hole.

4. The gas path diverter joint according to claim 1, characterized in that: The number of the shunt connection screw holes is an even number.

5. The gas path diverter joint according to claim 1, characterized in that: The diversion connection screw hole includes a threaded hole section and a straight section passing through the diversion cone. The diameter of the threaded hole section is larger than the straight section to form a joint positioning step.

6. The gas path diverter joint according to claim 5, characterized in that: The connecting pipe section is provided with a locking structure for conveniently locking the air intake pipe inserted into the connecting pipe section.

7. The gas path diverter joint according to claim 6, characterized in that: The locking structure includes a plurality of radial locking screw holes arranged on the connecting pipe section, and the inner threads of the radial locking screw holes are connected with tightening bolts for radially tightening the air intake pipe.

8. The gas path diverter joint according to claim 7, characterized in that: The connecting pipe section is provided with a pipe end positioning step for facilitating positioning of the end of the air inlet pipe, and the connecting pipe section is also provided with an annular sealing ring embedding groove.

9. The gas path diverter joint according to claim 8, characterized in that: The bottom of the diverter cone is provided with an upwardly concave groove.

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