CN202420929U - Low flow constant pressure module and air sampler including same - Google Patents
Low flow constant pressure module and air sampler including same Download PDFInfo
- Publication number
- CN202420929U CN202420929U CN2011204729188U CN201120472918U CN202420929U CN 202420929 U CN202420929 U CN 202420929U CN 2011204729188 U CN2011204729188 U CN 2011204729188U CN 201120472918 U CN201120472918 U CN 201120472918U CN 202420929 U CN202420929 U CN 202420929U
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- housing
- gas circuit
- inner segment
- constant voltage
- diaphragm
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Abstract
The utility model relates to the technical field of environmental protection and the technical field of technical analysis, particularly to a low flow constant pressure module and an air sampler including the same both used for environment pollution testing, industrial gas testing and indoor ambient air quality testing. The low flow constant pressure module provided by the utility model is applied to an air sampler, and includes a casing, wherein a first air passage, a second air passage, a switch and a pressure regulator are arranged in the casing; and the pressure regulator is used for controlling the communication between the first and the second air passages. Compared with the prior art, the low flow constant pressure module provided by the utility model can stabilize the pressure at an inlet of a diaphragm pump to be the pressure set by the constant pressure module, and enables the diaphragm pump to operate normally within the bearable pressure range of the diaphragm pump, thereby guaranteeing the stability of flow during the sampling.
Description
Technical field
The utility model relates to environmental technology field and technical analysis technical field, particularly a kind of air sampler that is used for the low discharge constant voltage module of environmental pollution test, industrial gasses test and indoor air quality test and comprises this constant voltage module.
Background technology
China's national Specification: the discharge stability of air sampler is not more than 5%.Homemade sampling thief uses the sampling thief of different flow scope when adopting 20～500ml/min flow usually and adopting the gas of 1000～3000ml/min flow.See also Fig. 1, be the schematic diagram of existing air sampler, air sampler comprises sampling media 1, flowmeter 2, variable valve 3 and membrane pump 4.Because different sampling medias 1 has different vapour locks, and the sampling media 1 common vapour lock of tubing is bigger.The normal atmospheric sampling thief that can satisfy sample range at 1000～3000ml/min flow is if do the stability requirement that the tubing sampling of 1/3rd following scopes of full scale can't be satisfied flow.Reason is that the vapour lock of sampling media 1 is excessive, when membrane pump 4 vacuum tightnesss are too high, is difficult to operate as normal.
The utility model content
First purpose of the utility model is to provide a kind of low discharge constant voltage module, and existing air sampler can't satisfy the technical matters of the stability requirement of flow in the prior art when low discharge is sampled to solve.
Second purpose of the utility model is to provide a kind of air sampler, and existing air sampler can't satisfy the technical matters of the stability requirement of flow in the prior art when low discharge is sampled to solve.
The utility model purpose realizes through following technical scheme:
A kind of low discharge constant voltage module is applied to air sampler, comprises housing, is provided with first gas circuit, second gas circuit, switch and pressure governor in the said housing, and said pressure governor is controlled the connection between said first gas circuit and said second gas circuit.
Preferably, said pressure governor comprises the adjusting knob that is arranged on the said housing, spring that is connected with adjusting knob and the diaphragm that is connected with spring, and said diaphragm is spaced apart with said first gas circuit and said second gas circuit.
Preferably, said spring is connected through web member with said diaphragm, said web member and said housing butt, and the butt place of said web member is provided with spout hole.
Preferably, said first gas circuit comprises the entrance and first inner segment with air communication, and said entrance and said first inner segment are communicated with.
Preferably, said second gas circuit comprises second inner segment and the outlet section that is communicated with membrane pump, and said switch is controlled the connection of said second inner segment and said outlet section, and said diaphragm is spaced apart with said first inner segment and said second inner segment.
Preferably, said housing comprises first housing and second housing, and said first housing and said second housing are spirally connected.
A kind of air sampler; Comprise the sampling media, flowmeter, variable valve and the membrane pump that connect successively; Also comprise low discharge constant voltage module, said low discharge constant voltage module is connected with said membrane pump, and said low discharge constant voltage module comprises housing; Be provided with first gas circuit, second gas circuit, switch and pressure governor in the said housing, said pressure governor is controlled the connection between said first gas circuit and said second gas circuit.
Preferably; Said pressure governor comprises the adjusting knob that is arranged on the said housing, spring that is connected with adjusting knob and the diaphragm that is connected with spring; Said diaphragm is spaced apart with said first gas circuit and said second gas circuit; Said spring is connected through web member with said diaphragm, said web member and said housing butt, and the butt place of said web member is provided with spout hole.
Preferably; Said first gas circuit comprises the entrance and first inner segment with air communication; Said entrance and said first inner segment are communicated with; Said second gas circuit comprises second inner segment and the outlet section that is communicated with membrane pump, and said switch is controlled the connection of said second inner segment and said outlet section, and said diaphragm is spaced apart with said first inner segment and said second inner segment.
Preferably, said housing comprises first housing and second housing, and said first housing and said second housing are spirally connected.
Compared with prior art; The low discharge constant voltage module of the utility model can be with the pressure stability of membrane pump inflow point under the pressure that this constant voltage module sets; Make membrane pump can be in the pressure limit that it can bear operate as normal, to guarantee the stability of flow in the sampling process.
Description of drawings
Fig. 1 is the schematic diagram of existing air sampler;
Fig. 2 is the schematic diagram of the air sampler of the utility model;
Fig. 3 is the structural representation of the constant voltage module of the utility model;
Fig. 4 is the decomposing schematic representation of the constant voltage module of the utility model.
Fig. 5 is the cut-open view of the constant voltage module of the utility model.
Embodiment
Below in conjunction with accompanying drawing, specify the utility model.
See also Fig. 3-5, the low discharge constant voltage module of the utility model is applied to air sampler, comprises housing, is provided with first gas circuit, second gas circuit, switch 52 and pressure governor in the housing, and pressure governor is controlled the connection between first gas circuit and second gas circuit.
Pressure governor comprises the adjusting knob 53 that is arranged on the housing, spring 54 that is connected with adjusting knob 53 and the diaphragm 55 that is connected with spring 54, and diaphragm 55 is spaced apart with first gas circuit and second gas circuit.Spring 54 is connected through web member 56 with diaphragm 55, web member 56 and housing butt, and the butt place of web member 56 is provided with spout hole 561.
First gas circuit comprises the entrance 571 and first inner segment 572 with air communication, and the entrance 571 and first inner segment 572 are communicated with.Second gas circuit comprises second inner segment 582 and the outlet section 581 that is communicated with membrane pump, the connection of switch 52 controls, second inner segment 582 and outlet section 581, and diaphragm 55 is spaced apart with first inner segment 572 and second inner segment 582.
Housing comprises that first housing 511 and second housing, 512, the first housings 511 are connected through screw with second housing 512.
See also Fig. 2-5; The air sampler of the utility model comprises the sampling media 1, flowmeter 2, variable valve 3 and the membrane pump 4 that connect successively, also comprises low discharge constant voltage module 5; Low discharge constant voltage module 5 is connected with membrane pump 4; Low discharge constant voltage module 5 comprises housing, is provided with first gas circuit, second gas circuit, switch 52 and pressure governor in the housing, and pressure governor is controlled the connection between first gas circuit and second gas circuit.
Pressure governor comprises the adjusting knob 53 that is arranged on the housing, spring 54 that is connected with adjusting knob 53 and the diaphragm 55 that is connected with spring 54, and diaphragm 55 is spaced apart with first gas circuit and second gas circuit.Spring 54 is connected through web member 56 with diaphragm 55, web member 56 and housing butt, and the butt place of web member 56 is provided with spout hole 561.
First gas circuit comprises the entrance 571 and first inner segment 572 with air communication, and the entrance 571 and first inner segment 572 are communicated with.Second gas circuit comprises second inner segment 582 and the outlet section 581 that is communicated with membrane pump, the connection of switch 52 controls, second inner segment 582 and outlet section 581, and diaphragm 55 is spaced apart with first inner segment 572 and second inner segment 582.
Housing comprises that first housing 511 and second housing, 512, the first housings 511 are connected through screw with second housing 512.
When sampling flow greater than three of sampling thief full scale/for the moment, off switch 52, low discharge constant voltage module 5 is not worked.When sampling flow less than three of sampling thief full scale/for the moment, open switch 52, sampling thief switches to the low discharge sampling pattern.Through adjusting knob 53, make it compression spring 54, set a malleation and push down diaphragm 55.Switch 52 is opened; When pressure P 1 in second inner segment 582 that the air admission hole with membrane pump 4 is communicated with during less than the pressure P 2 of first inner segment 572, pressure moves diaphragm 55, has little of gas to pass through spout hole 561 and gets into second inner segment 582; Thereby get into membrane pump 4; Until reaching balance, diaphragm 55 sets back, thereby plays the effect of constant pressure.
The low discharge constant voltage module of the utility model can be with the pressure stability of membrane pump inflow point under the pressure that this constant voltage module sets, make membrane pump can be in the pressure limit that it can bear operate as normal, to guarantee the stability of flow in the sampling process.
More than the disclosed several specific embodiments that are merely the application, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection domain.
Claims (10)
1. low discharge constant voltage module; Be applied to air sampler, it is characterized in that, comprise housing; Be provided with first gas circuit, second gas circuit, switch and pressure governor in the said housing, said pressure governor is controlled the connection between said first gas circuit and said second gas circuit.
2. a kind of low discharge constant voltage module as claimed in claim 1; It is characterized in that; Said pressure governor comprises the adjusting knob that is arranged on the said housing, spring that is connected with adjusting knob and the diaphragm that is connected with spring, and said diaphragm is spaced apart with said first gas circuit and said second gas circuit.
3. a kind of low discharge constant voltage module as claimed in claim 2 is characterized in that said spring is connected through web member with said diaphragm, said web member and said housing butt, and the butt place of said web member is provided with spout hole.
4. a kind of low discharge constant voltage module as claimed in claim 3 is characterized in that said first gas circuit comprises the entrance and first inner segment with air communication, and said entrance and said first inner segment are communicated with.
5. a kind of low discharge constant voltage module as claimed in claim 4; It is characterized in that; Said second gas circuit comprises second inner segment and the outlet section that is communicated with membrane pump; Said switch is controlled the connection of said second inner segment and said outlet section, and said diaphragm is spaced apart with said first inner segment and said second inner segment.
6. a kind of low discharge constant voltage module as claimed in claim 1 is characterized in that said housing comprises first housing and second housing, and said first housing and said second housing are spirally connected.
7. air sampler; Comprise the sampling media, flowmeter, variable valve and the membrane pump that connect successively, it is characterized in that, also comprise low discharge constant voltage module; Said low discharge constant voltage module is connected with said membrane pump; Said low discharge constant voltage module comprises housing, is provided with first gas circuit, second gas circuit, switch and pressure governor in the said housing, and said pressure governor is controlled the connection between said first gas circuit and said second gas circuit.
8. a kind of air sampler as claimed in claim 7; It is characterized in that; Said pressure governor comprises the adjusting knob that is arranged on the said housing, spring that is connected with adjusting knob and the diaphragm that is connected with spring, and said diaphragm is spaced apart with said first gas circuit and said second gas circuit, and said spring is connected through web member with said diaphragm; Said web member and said housing butt, the butt place of said web member is provided with spout hole.
9. a kind of air sampler as claimed in claim 8; It is characterized in that; Said first gas circuit comprises the entrance and first inner segment with air communication, and said entrance and said first inner segment are communicated with, and said second gas circuit comprises second inner segment and the outlet section that is communicated with membrane pump; Said switch is controlled the connection of said second inner segment and said outlet section, and said diaphragm is spaced apart with said first inner segment and said second inner segment.
10. a kind of air sampler as claimed in claim 7 is characterized in that, said housing comprises first housing and second housing, and said first housing and said second housing are spirally connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204729188U CN202420929U (en) | 2011-11-24 | 2011-11-24 | Low flow constant pressure module and air sampler including same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204729188U CN202420929U (en) | 2011-11-24 | 2011-11-24 | Low flow constant pressure module and air sampler including same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202420929U true CN202420929U (en) | 2012-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204729188U Expired - Lifetime CN202420929U (en) | 2011-11-24 | 2011-11-24 | Low flow constant pressure module and air sampler including same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202420929U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712833A (en) * | 2014-01-20 | 2014-04-09 | 北京大学 | Ordinary pressure sampling device suitable for lower pressure environments in high altitude areas |
-
2011
- 2011-11-24 CN CN2011204729188U patent/CN202420929U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712833A (en) * | 2014-01-20 | 2014-04-09 | 北京大学 | Ordinary pressure sampling device suitable for lower pressure environments in high altitude areas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI OHSA EVALUATION CONSULTING CO., LTD. Free format text: FORMER NAME: SHANGHAI OHSA ENVIRONMENT RESOURCE MANAGEMENT CONSULTING CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 200092 room 24, building 63, No. 202, Chifeng Road, Shanghai, Yangpu District Patentee after: Occupational Health & Safety Assistances Inc. Address before: 200082 room 716, 527 - 720, Pingliang Road, Shanghai, Shanghai, Yangpu District Patentee before: Shanghai Ohsa Environmental Resource Management Consulting Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |