Multi-path same-speed switch valve

Abstract

The utility model provides a multi-path same-speed switch valve, which comprises a fixed valve seat, a movable valve seat, a diversion cone weir, an airflow contraction shell and a shell, axial through holes are annularly and uniformly distributed on the fixed valve seat and the movable valve seat along the circumferential direction, and when the axial through holes on the movable valve seat and the fixed valve seat are aligned, a channel between the movable valve seat and the fixed valve seat is conducted; the fixed valve seat and the movable valve seat are in running fit through the valve element assembly, the fixed valve seat is connected with the shell, the movable valve seat is rotatably installed in the shell, the front end of the movable valve seat is matched with the rear end of the fixed valve seat, the rear end of the movable valve seat is provided with the diversion cone weir, the rear end of the shell is provided with the airflow contraction shell, and the diversion cone weir is correspondingly arranged in the airflow contraction shell in a covering mode. And an annular channel is formed between the outer surface of the diversion cone weir and the airflow shrinkage shell. The structural design of the diversion cone weir and the airflow contraction shell is adopted, an annular uniform acceleration airflow channel is formed between the diversion cone weir and the airflow contraction shell, the effect of same-speed drainage on airflow is achieved, the airflow is uniform and is not separated during air exhaust, same-speed sampling is achieved, and synchronous control over the flow speed of samples in the sampling process is guaranteed.

Description

Technical Field

[0001] The utility model relates to a multi-channel same-speed switch valve, which is used for combining multi-channel inputs into one channel output, such as the connection between multi-channel sampling pipelines and a vacuum pump. Background Art

[0002] In existing gas sampling systems, multi-channel sampling is often involved. The multi-channel sampling pipelines and vacuum pumps are generally connected through multi-channel switch gate valves to achieve simultaneous gas extraction sampling in the multi-channel sampling pipelines. This multi-channel switch gate valve is a sliding valve. The structure of the multi-channel switch gate valve includes: a multi-row interface structure and a sliding pressure plate. The multi-row interface structure is an interface structure for parallel access or annular access. The sliding pressure plate and the multi-row interface structure are slidably matched. The sliding pressure plate presses or removes the multi-row interfaces to achieve the opening and closing of the multi-channel switch gate valve. When the sliding pressure plate is opened, a sample channel is formed between the multi-row interfaces and the pressure plate, and gas extraction can be performed.

[0003] The shortcomings of this multi-way same-speed switch valve are as follows: when this structure is pumping air, the sliding pressure plate is opened and multiple interfaces are pumped at the same time. Due to the different positions of the interfaces, the pressures at various points during the pumping process are different, which will cause uneven pumping speeds and cannot simulate gas samples in a specific environment and at a certain wind speed, thereby affecting the accuracy of the measurement. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the utility model provides a multi-channel same-speed switch valve to achieve same-speed sampling of multi-channel samples.

[0005] The specific technical solution of the utility model is as follows:

[0006] A multi-way same-speed switch valve comprises a fixed valve seat, a movable valve seat, a guide cone weir, an airflow contraction shell and an outer shell.

[0007] The fixed valve seat and the movable valve seat are both uniformly distributed with axial through holes in a circular shape along the circumferential direction. When the axial through holes on the movable valve seat and the fixed valve seat are aligned, the passage between the two is connected;

[0008] The fixed valve seat and the moving valve seat are rotatably matched through the valve core assembly, the fixed valve seat is connected to the shell, the moving valve seat is rotatably installed in the shell, the front end of the moving valve seat is matched with the rear end of the fixed valve seat, the rear end of the moving valve seat is installed with a guide cone weir, the rear end of the shell is installed with an air flow contraction shell, the corresponding cover of the guide cone weir is arranged inside the air flow contraction shell, an annular channel is formed between the outer surface of the guide cone weir and the air flow contraction shell, the axial channel on the moving valve seat is arranged corresponding to the position of the annular channel, and an air outlet nozzle is provided at the rear end of the air flow contraction shell, which is connected to the air extraction device; the rotation of the moving valve seat is controlled, and the misalignment or alignment of the axial through holes on the moving and fixed valve seats is adjusted to realize the switching of the rotary valve.

[0009] Furthermore, the valve core assembly includes a fixed valve core and a moving valve core, both of which are annular and provided with an axial hole for communicating with the axial through hole of the valve seat, the fixed valve core is installed on the fixed valve seat, and the moving valve core is installed on the moving valve seat; the rotation of the moving valve seat and the moving valve core is controlled, the misalignment or alignment of the axial holes of the moving valve core and the fixed valve core is adjusted, and the rotary valve switch is controlled.

[0010] Furthermore, a notch is opened on the shell, and a rocker is arranged at the notch, and the rocker is connected to the movable valve seat; by driving the rocker to swing, the rotation of the movable valve core and the misalignment and alignment of the axial hole on the movable valve core are controlled to realize the switch control of the valve.

[0011] Furthermore, the fixed valve core and the fixed valve seat, as well as the movable valve core and the movable valve seat are positioned and connected by cylindrical pins respectively; the fixed valve seat and the housing are connected by adjusting bolts and connected by a threaded gland at the outer end.

[0012] Furthermore, a positioning disc is provided between the fixed valve core and the fixed valve seat. The positioning disc is an annular structure adapted to the valve core. The positioning disc is provided with holes corresponding to the valve core, and tubular seals are installed at each hole of the positioning disc.

[0013] Furthermore, a gap is left between the mating surfaces of the fixed valve seat and the movable valve seat, and the gap is connected to the outside through the exhaust hole in the middle of the fixed valve seat to balance the pressure inside and outside the valve body;

[0014] Further, the fixed valve seat and the axial through hole of the fixed valve seat and the annular axial holes of the fixed valve core and the movable valve core are uniformly distributed on one or more circumferences;

[0015] Furthermore, the axial through holes evenly distributed in an annular pattern on the fixed valve seat are connected to the sampling pipeline via a pipe joint; and the valve seat is installed in the housing via a bearing.

[0016] Furthermore, the guide cone weir has a conical shape and a streamlined surface; the annular channel between the guide cone weir and the airflow contraction shell is a contraction curved surface structure with a gradually decreasing cross-sectional area.

[0017] Furthermore, sealing structures are provided at the connection between the outer shell and the airflow contraction shell, and at the connection between the movable valve seat and the bearing.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The multi-way same-speed switch valve of the utility model adopts the cooperation of the moving valve seat and the fixed valve seat, and further controls the switch of the rotary valve through the cooperation of the moving valve core and the static valve core, so the control is convenient and reliable.

[0020] At the same time, the structural design of the guide cone weir and the airflow contraction shell is adopted to form a ring-shaped accelerated airflow channel between the two, which plays the role of guiding the airflow at the same speed. The airflow is uniform and does not separate during vacuuming, realizing the same-speed sampling and ensuring the synchronous control of the sample flow rate during the sampling process.

[0021] In the multi-way isospeed on-off valve, the moving and fixed valve seats are provided with axial through holes that are evenly distributed in annular shapes. When sampling, the sample flows through the through holes of the fixed valve seat and the moving valve seat in turn, and then passes through the channel between the guide cone weir installed in the middle of the rear end of the moving valve seat and the airflow contraction shell. The channel forms an annular uniformly accelerated airflow, which has the isospeed effect of not causing separation of the airflow when flowing downstream. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a multi-way same-speed switch valve;

[0023] Figure 2 for Figure 1 The local enlarged view of point I in the middle;

[0024] Figure 3 for Figure 1 Right view of;

[0025] Figure 4 for Figure 1 Left view of

[0026] Figure 5 for Figure 1 AA view;

[0027] Figure 6 for Figure 5 K-direction view;

[0028] Figure 7 This is an example diagram of the application of multi-way same-speed switching valves in a gas synchronous acquisition system;

[0029] In the figure: 901-fixed valve seat; 902-moving valve seat; 903-housing; 904-conical weir; 905-airflow contraction shell; 906-threaded gland; 907-positioning disc; 908-fixed valve core; 909-moving valve core; 910-rocker; 911-sealing ring; 912-adjusting bolt; 913-flat key; 914-exhaust hole; C1-sampling needle; C2-bearing; C3-cylindrical pin; C4-tube gasket; C5-O-ring;

[0030] Figure 7Among them, 2-pressure delivery cylinder; 4-cleaning cylinder; 5-cleaning syringe; 6-sampling syringe; 7-sampling pipeline; 8-path guide; 9-multi-way same-speed switching valve; 10-sample delivery pipeline; 11-chromatographic analysis unit; 12-damping section; 13-vacuum pump unit; 14-rotating cylinder electric push rod; 28-air pressure reducing bottle; 29-flow meter; 30-bypass two-position valve; D1-check valve; D2-check valve; D3-check valve. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Embodiment 1:

[0032] like Figure 1-Figure 6 As shown, the multi-way equal-speed switch valve of the utility model includes a fixed valve seat 901 , a movable valve seat 902 , a guide cone weir 904 , an airflow contraction shell 905 and an outer shell 903 .

[0033] The fixed valve seat 901 and the movable valve seat 902 are both uniformly provided with axial through holes in an annular pattern along the circumferential direction. When the axial through holes on the movable valve seat 902 and the fixed valve seat 901 are aligned, the passage between the two is connected.

[0034] The fixed valve seat 901 and the movable valve seat 902 are rotatably matched through the valve core assembly, the fixed valve seat 901 is connected to the outer shell 903, the movable valve seat 902 is rotatably installed in the outer shell 903, the front end of the movable valve seat 902 is matched with the rear end of the fixed valve seat 901, the guide cone weir 904 is installed at the rear end of the movable valve seat 902, and the airflow contraction shell 905 is installed at the rear end of the outer shell 903. The corresponding cover of the guide cone weir 904 is arranged inside the airflow contraction shell 905, and an annular channel is formed between the outer surface of the guide cone weir 904 and the airflow contraction shell 905. The axial channel on the movable valve seat 902 is arranged corresponding to the position of the annular channel, and an air outlet nozzle is provided at the rear end of the airflow contraction shell 905, which is connected to the vacuum pump unit; the rotation of the movable valve seat 902 is controlled, and the misalignment or alignment of the axial through holes on the movable and fixed valve seats is adjusted to realize the switching of the rotary valve.

[0035] A notch is opened on the housing 903, and a rocker 910 is set at the notch. The rocker 910 is connected to the moving valve seat 902; and the rocker 910 is driven to swing by an electric push rod to control the rotation of the moving valve core 909 and the misalignment and alignment of the axial hole on the moving valve core 909 to realize the opening and closing of the valve. Embodiment 2:

[0036] A further optional design of this example is that Figure 2As shown, the valve core assembly includes a fixed valve core 908 and a moving valve core 909, both of which are annular and have an axial hole for communicating with the axial through hole of the valve seat, the fixed valve core 908 is installed on the fixed valve seat 901, and the moving valve core 909 is installed on the moving valve seat 902; the rotation of the moving valve seat 902 and the moving valve core 909 is controlled, the misalignment or alignment of the axial hole between the moving valve core 909 and the fixed valve core 908 is adjusted, and the switch of the rotary valve is controlled; the valve is normally closed, as long as the switch valve is opened, the bypass is closed, and the vacuum pump starts sampling; after the sampling is completed, the switch valve is closed, the bypass is opened, and the vacuum pump performs air circulation.

[0037] The fixed valve core 908 and the fixed valve seat 901, as well as the movable valve core 909 and the movable valve seat 902 are respectively positioned and connected by cylindrical pins C3;

[0038] The fixed valve seat 901 is connected to the housing 903 by means of an adjusting bolt 912 and is connected at the outer end by means of a threaded gland. Embodiment 3:

[0039] A further optional design of this example is that Figure 2 As shown, a positioning disc 907 is provided between the fixed valve core 908 and the fixed valve seat 901 . The positioning disc 907 is an annular structure adapted to the valve core. The positioning disc 907 is provided with holes corresponding to the valve core, and a tubular sealing member C4 is installed at each hole of the positioning disc 907 .

[0040] A gap is left between the mating surfaces of the fixed valve seat 901 and the movable valve seat 902, and the gap is connected to the outside through the exhaust hole 914 in the middle of the fixed valve seat;

[0041] The axial through holes of the fixed valve seat 901 and the movable valve seat 902 and the annular axial holes of the fixed valve core 908 and the movable valve core 909 are evenly distributed on one or more circumferences.

[0042] The movable valve seat 902 is installed in the housing 903 through the bearing C2; the connection between the housing 903 and the airflow contraction housing 905, and the connection between the movable valve seat 902 and the bearing are both provided with sealing structures. Embodiment 4:

[0043] A further optional design of this example is that the axial through holes evenly distributed in an annular manner on the fixed valve seat 901 are connected to the sampling pipeline through a pipe joint; the air outlet nozzle at the front end of the airflow contraction shell 905 is connected to the vacuum pump unit, which is used to uniformly extract samples from multiple sampling pipelines at the same time. The shape of the guide cone weir 904 is conical, and the surface is a streamlined structure. The annular channel between the guide cone weir 904 and the airflow contraction shell 905 is a contraction curved surface structure with a gradually decreasing cross-sectional area, which realizes uniform acceleration of the airflow. Embodiment 5:

[0044] A further optional design of this example is that the axial channels of the fixed valve seat 901 and the movable valve seat 902, and the axial holes of the fixed valve core 908 and the movable valve core 909 are all arranged on two circles; 24 axial channels are arranged on each circle, forming a total of 48 axial channels, which can connect 48 sampling lines.

[0045] Application examples:

[0046] like Figure 7 As shown, the multi-way same-speed switch valve of the utility model is applied in a gas synchronous collection system. The gas synchronous collection system includes a support frame, a sampling unit, a sample supply unit, a vacuum pump unit 13, a cleaning syringe assembly, a chromatographic analysis unit 11, a sampling pipeline 7 and a sample delivery pipeline 10. The sample supply unit is connected to the vacuum pump unit 13 through a plurality of sampling pipelines.

[0047] The sampling unit includes a plurality of sampling syringes 6, each of which includes a syringe and a plunger, and each syringe is arranged side by side on a support frame; the lower end of each syringe is connected to a sampling pipeline 7, each sampling pipeline 7 is connected to a sample delivery pipeline 10, and is connected to a chromatographic analysis unit 11 through the sample delivery pipeline 10; the sampling unit also includes a sampler lifting assembly and a pressure delivery cylinder 2, the sampler lifting assembly is used to drive the plunger to rise and fall, so as to realize the cleaning of the sampling syringe and the collection of samples; the pressure delivery cylinder 2 is used to press the plunger downward to press the sample in the syringe into the chromatographic analysis unit;

[0048] A vacuum pump unit 13, used to provide power for the sampling pipeline;

[0049] A cleaning syringe assembly is connected to the path guide via a pipeline and is used for cleaning the sampling pipeline;

[0050] A path guide is provided on the sampling pipeline 7, which is connected in the sampling pipeline and respectively connected to the cleaning syringe assembly and the chromatographic analysis unit; it is used to control the simultaneous conduction of multiple sampling pipelines and the single conduction of one sampling syringe and the sample delivery pipeline, thereby realizing multi-channel simultaneous sampling and single-channel sample delivery.

[0051] The multi-way same-speed switch valve 9 of the utility model is connected to the rear end of the sampling pipeline, and is used to convert the connected multi-way sampling pipeline into an output pipeline connected to the vacuum pump unit 13. A damping section 12 for rectifying the flow is provided in the system, which is arranged between the output pipeline of the multi-way same-speed switch valve 9 and the vacuum pump unit. The output end of the multi-way same-speed switch valve 9 is connected to the vacuum pump unit 13 through the damping section 12 and the bypass two-position valve 30. 14 represents the rotation of the moving valve core, and the switching of the multi-way same-speed switch valve is realized by the rotation of the moving valve core.

Claims

1. A multi-way same-speed switch valve, characterized in that: It includes a fixed valve seat, a moving valve seat, a guide cone weir, an air flow contraction shell and an outer shell. The fixed valve seat and the movable valve seat are both uniformly distributed with axial through holes in a circular shape along the circumferential direction. When the axial through holes on the movable valve seat and the fixed valve seat are aligned, the passage between the two is connected; The fixed valve seat and the moving valve seat are rotatably matched through the valve core assembly, the fixed valve seat is connected to the shell, the moving valve seat is rotatably installed in the shell, the front end of the moving valve seat is matched with the rear end of the fixed valve seat, the rear end of the moving valve seat is installed with a guide cone weir, the rear end of the shell is installed with an air flow contraction shell, the corresponding cover of the guide cone weir is arranged inside the air flow contraction shell, an annular channel is formed between the outer surface of the guide cone weir and the air flow contraction shell, the axial channel on the moving valve seat is arranged corresponding to the position of the annular channel, and an air outlet nozzle is provided at the rear end of the air flow contraction shell, which is connected to the air extraction device; the rotation of the moving valve seat is controlled, and the misalignment or alignment of the axial through holes on the moving and fixed valve seats is adjusted to realize the switching of the rotary valve.

2. The multi-way same-speed switching valve according to claim 1, characterized in that: The valve core assembly includes a fixed valve core and a moving valve core. Both the fixed valve core and the moving valve core are annular and are provided with an axial hole for communicating with the axial through hole of the valve seat. The fixed valve core is installed on the fixed valve seat, and the moving valve core is installed on the moving valve seat. The rotation of the moving valve seat and the moving valve core is controlled, and the misalignment or alignment of the axial holes of the moving valve core and the fixed valve core is adjusted to control the switch of the rotary valve.

3. The multi-way same-speed switching valve according to claim 2 is characterized in that: A notch is opened on the shell, and a rocker is arranged at the notch, and the rocker is connected to the movable valve seat; by driving the rocker to swing, the rotation of the movable valve core and the misalignment and alignment of the axial hole on the movable valve core are controlled to realize the switch control of the valve.

4. The multi-way same-speed switching valve according to claim 2 is characterized in that: A positioning disc is provided between the fixed valve core and the fixed valve seat. The positioning disc is an annular structure adapted to the valve core. The positioning disc is provided with holes corresponding to the valve core, and tubular sealing members are installed at each hole of the positioning disc.

5. The multi-way same-speed switching valve according to claim 3 is characterized in that: The fixed valve core and the fixed valve seat, as well as the moving valve core and the moving valve seat are respectively positioned and connected by cylindrical pins; the fixed valve seat and the housing are connected by adjusting bolts and connected by a threaded gland at the outer end.

6. The multi-way same-speed switching valve according to claim 1, characterized in that: A gap is left between the mating surfaces of the fixed valve seat and the moving valve seat, and the gap is connected to the outside through the exhaust hole in the middle of the fixed valve seat.

7. The multi-way same-speed switching valve according to claim 1, characterized in that: The fixed valve seat and the axial through hole of the fixed valve seat and the annular axial holes of the fixed valve core and the movable valve core are evenly distributed on one or more circumferences.

8. The multi-way same-speed switching valve according to claim 1, characterized in that: The axial through holes evenly distributed in an annular pattern on the fixed valve seat are connected to the sampling pipeline via a pipe joint; the valve seat is installed in the housing through a bearing.

9. The multi-way same-speed switching valve according to any one of claims 1 to 8, characterized in that: The guide cone weir has a conical shape and a streamlined surface; the annular channel between the guide cone weir and the airflow contraction shell is a contraction curved surface structure with a gradually decreasing cross-sectional area.

10. The multi-way same-speed switching valve according to claim 1, characterized in that: Sealing structures are provided at the connection between the outer shell and the airflow contraction shell, and at the connection between the moving valve seat and the bearing.

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