CN219841077U - Constant pressure difference type constant flow sampling valve - Google Patents
Constant pressure difference type constant flow sampling valve Download PDFInfo
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- CN219841077U CN219841077U CN202320879448.XU CN202320879448U CN219841077U CN 219841077 U CN219841077 U CN 219841077U CN 202320879448 U CN202320879448 U CN 202320879448U CN 219841077 U CN219841077 U CN 219841077U
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- 238000005070 sampling Methods 0.000 title claims abstract description 66
- 238000007789 sealing Methods 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 description 7
- 239000012080 ambient air Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 238000002444 silanisation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
The utility model relates to the technical field of environmental monitoring sampling valve equipment, and particularly discloses a constant pressure difference type constant flow sampling valve, wherein a cavity is arranged in the valve body; the pneumatic diaphragm is arranged in the cavity and divides the cavity into an upper cavity and a lower cavity; the upper cavity is connected to the lower part of the valve cover through a first through hole, and the upper part of the valve cover is provided with a second through hole communicated with the atmosphere; the lower cavity is connected to the sampling bottle connection port through a gas exhaust channel and is also connected to the gas inlet through a gas inlet channel; a micropore orifice restrictor is arranged in the gas inlet channel; the pneumatic diaphragm is used for closing or opening the gas exhaust passage. The utility model adopts the pressure difference between the sampling bottle and the surrounding air to control the pneumatic diaphragm to realize the opening and closing of the gas discharge channel, thereby ensuring that the constant pressure difference is always kept at the two ends of the microporous orifice restrictor, ensuring the stability of the gas flow in the sampling process of the sample and ensuring the reliability of the sampling result.
Description
Technical Field
The utility model relates to the technical field of environment monitoring sampling valve equipment, in particular to a constant pressure difference type constant flow sampling valve.
Background
The ecological environment monitoring is a foundation for ecological environment protection and is an important support for ecological civilization construction. The on-site sampling is a basic step in the environment monitoring process, is a primary link for carrying out various monitoring works subsequently, and the quality of the on-site sampling work can directly influence the quality of the whole ecological environment monitoring work. Therefore, the quality control of the on-site sampling must be emphasized, so that the collected sample is a representative and complete sample and is a sample which meets the planning requirements and is truly.
The existing sampling methods of VOCs in the ambient air mainly comprise a solution absorption sampling method, an adsorption tube sampling method, an air bag sampling method, a tank/bottle sampling method and the like. In the solution absorption method, a solution absorbent is easily influenced by environmental conditions, and the acquired sample may undergo secondary reaction in the absorption liquid, so that the reliability of an analysis result is low; in the sampling process of the adsorption tube, the adsorption tube is easy to be influenced by the environment, meanwhile, no single adsorbent is suitable for collecting all organic compounds with high volatility and polarity, so that all sampled target compound types are limited, meanwhile, substances with low volatility and easy adsorption are difficult to resolve, and penetration problems can exist on the easily volatile substances, so that the sampling method of the adsorption tube is limited as well; in addition, the air bag has poor repeatability of the sampling result due to adsorption on the inner surface, so that can (bottle) sampling is a main weapon for current ambient air sampling in a comprehensive view.
In order to obtain a representative environmental sample, it is generally necessary to sample in a "continuous period" manner, i.e., at the same flow rate over a period of time, the flow deviation before and after sampling should be within a specified range to ensure that an "average" mixed sample is obtained, thus accurately reflecting the average condition of the ambient air. So, constant sampling flow and control is an important element of sampling the ambient VOCs gas samples.
However, during actual sampling, as the sampling process is performed, the pressure difference between the gas pressure in the sampling bottle and the pressure in the environment gradually decreases, and the sampling flow rate also decreases, so that the collected sample cannot accurately reflect the average condition of the ambient air, and an effective sample is difficult to obtain.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a constant pressure difference type constant flow sampling valve, which solves the problems that the pressure difference between the sampling bottle and the environment is reduced, the sampling flow rate is changed along with the reduction of the pressure difference in the sampling bottle during the environment sampling, and the stability of the gas flow in the sampling process is difficult to ensure.
In order to solve the technical problems, the utility model adopts the following technical scheme: a constant pressure difference type constant flow sampling valve comprises a valve body, a pneumatic diaphragm, a valve cover, a cavity and a sampling bottle connecting port;
the cavity is arranged in the valve body;
the pneumatic diaphragm is arranged in the cavity and divides the cavity into an upper cavity and a lower cavity;
the upper cavity is connected to the lower part of the valve cover through a first through hole, and a second through hole communicated with the atmosphere is formed in the upper part of the valve cover;
the lower cavity is connected to the sampling bottle connection port through a gas exhaust channel and is also connected to the gas inlet through a gas inlet channel; a micropore orifice restrictor is arranged in the gas inlet channel;
the pneumatic diaphragm is used for closing or opening the gas exhaust passage.
As a further technical scheme of the scheme, the gas-discharging device further comprises a sealing surface which is arranged at the joint of the gas-discharging channel and the lower cavity.
As a further technical scheme of the scheme, the sealing surface is arc-shaped, and the sealing size is matched with that of the pneumatic diaphragm.
As a further technical solution of the above solution, the apparatus further includes a pressure sensor and a pressure measurement channel, one end of the pressure measurement channel is connected to the gas discharge channel, and the other end is connected to the pressure sensor.
As a further technical scheme of the scheme, a stainless steel sintered filter is further arranged in the gas inlet channel, and the stainless steel sintered filter is positioned at the front end of the microporous orifice restrictor.
As a further technical scheme of the scheme, the pneumatic diaphragm is a corrugated diaphragm.
Compared with the prior art, the utility model has the following advantages and beneficial effects: the utility model adopts the pressure difference between the sampling bottle and the surrounding air to control the pneumatic diaphragm to realize the opening and closing of the gas discharge channel, thereby ensuring that the constant pressure difference is always kept at the two ends of the microporous orifice restrictor, ensuring the stability of the gas flow in the sampling process of the sample and ensuring the reliability of the sampling result.
Drawings
Fig. 1 is a schematic diagram of the front structure of the present utility model.
The definitions of the various numbers in the figures are: a valve body-1; a microporous orifice restrictor-2; stainless steel sintered filter-3; gas inlet channel-4; a pressure sensor-5; a pressure measurement channel-6; a valve cover-7; pneumatic diaphragm-8; sealing face-9; a gas discharge passage-10; a sampling bottle connection port-11; a cavity-12; a first through hole-13; and a second through hole-14.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, so as to further understand the concept of the present utility model, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought thereby.
As shown in fig. 1, the constant pressure difference type constant flow sampling valve comprises a valve body 1, a pneumatic diaphragm 8, a valve cover 7, a cavity 12 and a sampling bottle connecting port 11;
a cavity 12 provided in the valve body 1;
the pneumatic diaphragm 8 is arranged in the cavity 12 and divides the cavity 12 into an upper cavity and a lower cavity;
the upper cavity is connected to the lower part of the valve cover 7 through a first through hole 13, and a second through hole 14 communicated with the atmosphere is arranged at the upper part of the valve cover 7;
the lower cavity is connected to a sampling bottle connection port 11 through a gas discharge channel 10 and is also connected to a gas inlet through a gas inlet channel 4; a micropore orifice plate restrictor 2 is arranged in the gas inlet channel 4;
the pneumatic diaphragm 8 is used to close or open the gas discharge channel 10.
The principle of the utility model is as follows: when the device is used for sampling, gas enters the valve body 1 from the gas inlet channel 4, firstly, the pipe diameter of the gas enters the microporous orifice restrictor 2, the microporous orifice restrictor 2 is changed into small flow and continuously circulates, the flow speed of the gas is far smaller than that of the gas outlet channel 10, the gas in the lower cavity quickly enters the sampling bottle through the gas outlet channel 10 and the sampling bottle connecting port 11, the pressure in the lower cavity is reduced, and when the pressure is lower than a certain threshold value, the gas outlet channel 10 is blocked by the pneumatic diaphragm 8, and the gas outlet channel 10 is closed; as sample gas continuously enters the lower cavity, the pressure in the cavity of the lower cavity rises, when the pressure exceeds a certain threshold value, the pneumatic diaphragm 8 pops off from the gas discharge channel 10, the gas discharge channel 10 is opened, the sample gas enters the sampling bottle, and the pneumatic diaphragm 8 is reciprocated in such a way that vibration occurs along with the pressure difference change of the upper cavity and the lower cavity and is continuously and automatically opened and closed with the gas discharge channel 10, so that the pressure difference at two ends of the microporous orifice restrictor 2 is ensured to be constant, and the gas enters the sampling bottle at a constant flow rate, and the sampling operation is completed; in corrosive gas sampling of harsh environment sampling, an internal sampling channel of a sampling valve is easily influenced by the corrosive gas, and a certain degree of adsorption exists on volatile organic matters with stronger polarity to influence a sampling result; the full gas circuit in the valve body 1 adopts silanization passivation treatment, so that no gas is adsorbed on the surface of the valve body 1 in the sampling process, and the accuracy of an analysis result is further ensured.
The utility model further discloses a preferred embodiment, which also comprises a sealing surface 9 arranged at the connection of the gas discharge channel 10 and the lower chamber. In this embodiment, the sealing surface 9 is disposed at the gas exhaust channel 10, and when the pneumatic diaphragm 8 blocks the gas exhaust channel 10 downward, the sealing surface 9 can play a role in sealing, so as to ensure that the gas exhaust channel 10 is completely closed.
The utility model further discloses a preferred embodiment of the sealing surface, wherein the sealing surface 9 is arc-shaped, and the sealing dimension is matched with that of the pneumatic diaphragm 8. In this embodiment, the sealing surface 9 is set to be matched with the size of the pneumatic diaphragm 8, and the sealing effect is better when the pneumatic diaphragm 8 plugs the sealing surface 9 downward.
The utility model further discloses a preferred embodiment, further comprising a pressure sensor 5 and a pressure measuring channel 6, one end of the pressure measuring channel 6 being connected to the gas discharge channel 10 and the other end being connected to the pressure sensor 5. In the present embodiment, the pressure measuring channel 6 and the gas discharge channel 10 are connected, and the pressure of the gas discharge channel 10 is monitored in real time by the pressure sensor 5.
The utility model further discloses a preferred embodiment of the gas inlet channel, wherein a stainless steel sintered filter 3 is further arranged in the gas inlet channel 4, and the stainless steel sintered filter 3 is positioned at the front end of the microporous orifice restrictor 2. In the embodiment, the stainless steel sintered filter 3 is set to be 1-5um, the strength is high, the precision is high, the phenomenon that materials fall off in the using process can be avoided, and meanwhile, the stainless steel sintered filter has good corrosion resistance.
The utility model further discloses a preferred embodiment of the pneumatic diaphragm, wherein the pneumatic diaphragm 8 is a corrugated diaphragm. The corrugated membrane used in the embodiment has good elasticity, and the stable operation of the device is further ensured.
The terms "connected" and "fixed" used in the description of the present utility model may be fixed, formed, welded, or mechanically connected, and the specific meaning of the terms in the present utility model is understood in specific cases.
In the description of the present utility model, the terms "center," "upper," "lower," "horizontal," "inner," "outer," and the like are used merely for convenience in describing the present utility model and to simplify the description, and do not denote or imply a particular orientation that the device or element in question must have, and thus should not be construed as limiting the utility model.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (6)
1. A constant pressure difference type constant flow sampling valve is characterized in that: comprises a valve body (1), a pneumatic diaphragm (8), a valve cover (7), a cavity (12) and a sampling bottle connecting port (11);
the cavity (12) is arranged in the valve body (1);
the pneumatic diaphragm (8) is arranged in the cavity (12) and divides the cavity (12) into an upper cavity and a lower cavity;
the upper cavity is connected to the lower part of the valve cover (7) through a first through hole (13), and a second through hole (14) communicated with the atmosphere is formed in the upper part of the valve cover (7);
the lower cavity is connected to a sampling bottle connection port (11) through a gas discharge channel (10) and is also connected to a gas inlet through a gas inlet channel (4); a micropore orifice restrictor (2) is arranged in the gas inlet channel (4);
the pneumatic diaphragm (8) is used for closing or opening a gas discharge channel (10).
2. The constant pressure differential constant flow sampling valve as claimed in claim 1, wherein: the sealing surface (9) is arranged at the joint of the gas discharge channel (10) and the lower cavity.
3. A constant pressure differential and constant flow sampling valve as claimed in claim 2, wherein: the sealing surface (9) is arc-shaped, and the sealing size is matched with that of the pneumatic diaphragm (8).
4. The constant pressure differential constant flow sampling valve as claimed in claim 1, wherein: the device also comprises a pressure sensor (5) and a pressure measuring channel (6), wherein one end of the pressure measuring channel (6) is connected to the gas discharge channel (10), and the other end is connected to the pressure sensor (5).
5. The constant pressure differential constant flow sampling valve as claimed in claim 1, wherein: the gas inlet channel (4) is internally provided with a stainless steel sintered filter (3), and the stainless steel sintered filter (3) is positioned at the front end of the microporous orifice restrictor (2).
6. The constant pressure differential constant flow sampling valve as claimed in claim 1, wherein: the pneumatic diaphragm (8) is a corrugated diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320879448.XU CN219841077U (en) | 2023-04-19 | 2023-04-19 | Constant pressure difference type constant flow sampling valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320879448.XU CN219841077U (en) | 2023-04-19 | 2023-04-19 | Constant pressure difference type constant flow sampling valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219841077U true CN219841077U (en) | 2023-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320879448.XU Active CN219841077U (en) | 2023-04-19 | 2023-04-19 | Constant pressure difference type constant flow sampling valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219841077U (en) |
-
2023
- 2023-04-19 CN CN202320879448.XU patent/CN219841077U/en active Active
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