Condensing and drying device for gas to be detected of PID detector

Abstract

The utility model relates to the field of gas detection, in particular to a to-be-detected gas condensation drying device of a PID detector, which comprises a drying cylinder, the drying cylinder comprises a closed outer cylinder, an inner cylinder is arranged in the outer cylinder, a gas inlet pipe A is arranged in the radial direction of the inner cylinder, a gas outlet pipe A is arranged at the top of the inner cylinder, and a water drainage pipe is arranged at the bottom of the inner cylinder. Pipe openings of the air inlet pipe A, the air outlet pipe A and the drainage pipe extend out of the outer cylinder, a cooling cavity is formed between the outer cylinder and the inner cylinder, and an air inlet pipe B and an air outlet hole which are communicated with the cooling cavity are formed in the outer cylinder; a cold air outlet of the vortex tube is communicated with the air inlet pipe B through a pipeline. According to the to-be-detected gas condensing and drying device of the PID detector, cold air exhausted by the vortex tube serves as a cold source to condense and dry to-be-detected gas passing through the inner cylinder, and the to-be-detected gas condensing and drying device is convenient to use and low in maintenance cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas detection field, concretely relates to a kind of to be measured gas condensation drying device of PID detector. BACKGROUND

[0002] PID detector is a kind of gas detector using photoionization detection technology, generally used in VOC gas detection field.Although photoionization detection technology has many points, but also has some limitations, the detection accuracy of PID detector using photoionization detection technology is greatly influenced by the humidity of detection gas, that is, the moisture contained in detection gas will greatly interfere with the detection of VOC detection gas, under normal circumstances, with the increase of humidity, the concentration actually displayed by PID detector will be more and more large, which not only leads to the inaccuracy of the concentration value of VOC gas detected, but also leads to the frequent false alarm caused by the high display value of PID detector under the condition of high environmental humidity.

[0003] In order to solve this problem, the industry currently commonly carries out water removal drying treatment on the VOC gas to be detected before being introduced into the detector for detection, so that the influence of humidity on the detection accuracy of the PID detector for the VOC gas can be excluded. The commonly used water removal drying treatment methods in the industry include adsorption, absorption and filtration. The adsorption method is a commonly used water vapor removal method for VOC gas, which utilizes the porous structure of the adsorption material such as activated carbon to adsorb the water in the VOC gas to be detected. This method is simple in operation and low in cost, but the disadvantages are also obvious: 1. A material that only adsorbs water but not VOC detection gas needs to be used, which is not easy to find; 2. The adsorption material will be saturated after adsorbing water to a certain extent, and needs to be regenerated by drying and the like after saturation. The regenerated treatment may fail after a certain number of times, and new adsorption material needs to be replaced, so the maintenance cost is high. The absorption method utilizes organic solvents such as diesel or 200# gasoline to absorb water vapor and other components in the VOC gas. The absorbed solvent can be used as fuel or diluent. This method is simple in operation and low in cost, but the disadvantages are also obvious: 1. The treatment is not clean, and a small amount of water vapor may still remain after absorption treatment; 2. Most of the VOC gas to be detected is organic matter, which will also be dissolved in the organic solvent; 3. The organic solvent also needs to be regenerated after absorbing water to a certain extent, and may also fail after a certain number of times of regeneration treatment, so new adsorption material needs to be replaced, and the maintenance cost is also high. The filtration method uses a filter with a filter membrane to filter water, such as a polytetrafluoroethylene filter membrane. The advantage of this treatment method is that the filtering effect on condensation is good, but the disadvantages are also obvious: 1. The filtering effect on gaseous water is poor; 2. Due to the accumulation of dust, the filter membrane will fail after a long time of use, and the filter element needs to be replaced regularly, so the maintenance cost is also high. Practical new type content

[0004] The utility model discloses a PID detector's to be detected gas condensation drying device, through the cold gas of vortex tube discharge as cold source to the gas to be detected that passes through the inner tube and carries out condensation drying, convenient, maintenance cost is low.

[0005] The utility model discloses the following technical scheme realizes:

[0006] A PID detector's to be detected gas condensation drying device, including,

[0007] A drying cylinder includes a closed outer cylinder and an inner cylinder inside the outer cylinder. An air inlet pipe A is radially arranged in the inner cylinder, an air outlet pipe A is arranged at the top, and a drain pipe is arranged at the bottom. The openings of the air inlet pipe A, the air outlet pipe A, and the drain pipe all extend out of the outer cylinder. A cooling chamber is formed between the outer cylinder and the inner cylinder. An air inlet pipe B and an air outlet hole are arranged on the outer cylinder, which are connected to the cooling chamber.

[0008] The vortex tube has its cold air outlet connected to the air inlet pipe B via a pipe.

[0009] Furthermore, the air intake pipe A is located near the bottom of the inner cylinder.

[0010] Furthermore, the diameter of the air inlet pipe B is larger than that of the air outlet.

[0011] Furthermore, a condensate collection cylinder is fixedly connected below the drying cylinder, and the drain pipe is inserted into the condensate collection cylinder.

[0012] Furthermore, an overflow pipe is provided on the condensate receiving cylinder.

[0013] Furthermore, the overflow pipe outlet is positioned downwards.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention employs the principle of condensation and water removal, utilizing the cold air output from the cold air output end of the vortex tube device as a cooling source to perform condensation and drying pretreatment on the gas to be detected by the PID detector. The condensation and drying treatment has a good drying effect and is effective in treating both condensed liquid water and gaseous water vapor. After the condensation and drying treatment, the moisture in the detected gas becomes liquid water, settles to the receiver, and is automatically discharged, requiring no maintenance. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] like Figure 1 As shown, a condensation and drying device for the gas to be measured in a PID detector includes,

[0020] A drying cylinder 10, which comprises an outer cylinder 101 arranged in a closed manner, an inner cylinder 102 arranged in the outer cylinder 101, the inner cylinder 102 is radially provided with an air inlet pipe A1021, the top is provided with an air outlet pipe A1022, the bottom is provided with a drain pipe 1023, the air inlet pipe A1021, the air outlet pipe A1022 and the drain pipe 1023 are all protruding from the outer cylinder 101, a cooling cavity 103 is formed between the outer cylinder 101 and the inner cylinder 102, the outer cylinder 101 is provided with an air inlet pipe B1011 and an air outlet hole 1012 which are connected with the cooling cavity 103.

[0021] A vortex tube 20, the cold air outlet of the vortex tube 20 is connected with the air inlet pipe B1011 through a pipeline.

[0022] Further, in order to improve the cooling effect of the gas to be dried, the air inlet pipe A1021 is arranged close to the bottom of the inner cylinder 102.

[0023] Further, in order to improve the residence time of the cold air, the diameter of the air inlet pipe B1011 is greater than that of the air outlet hole 1012.

[0024] Further, in order to form a liquid seal at the drain pipe 1023, a condensate water receiving cylinder 30 is further fixedly connected below the drying cylinder 10, and the drain pipe 1023 is inserted into the condensate water receiving cylinder 30.

[0025] Further, in order to avoid excessive water load of the condensate water receiving cylinder 30, the condensate water receiving cylinder 30 is provided with an overflow pipe 301, and the water outlet of the overflow pipe 301 is arranged downward.

[0026] Specifically, during use, compressed air is sent into the vortex tube 20 (the working principle of the vortex tube is a prior art and will not be described here), the cooling gas enters the cooling cavity 103 from the air inlet pipe B1011 through the cold air outlet of the vortex tube 20, the gas to be detected enters the inner cylinder 102 from the air inlet pipe A1021, the condensate water is discharged into the condensate water receiving cylinder 30 through the drain pipe 1023, and when the cooling water is excessive, it can overflow from the overflow pipe 301, so that no later maintenance is required.

[0027] Finally, it should be pointed out that the above description is only the preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A gas to be measured condensing and drying device of a PID probe, characterized by, Including, The drying cylinder (10) comprises an outer cylinder (101) arranged in a closed manner, an inner cylinder (102) arranged in the outer cylinder (101), an air inlet pipe A (1021) arranged radially on the inner cylinder (102), an air outlet pipe A (1022) arranged at the top of the inner cylinder (102), and a drain pipe (1023) arranged at the bottom of the inner cylinder (102), wherein the air inlet pipe A (1021), the air outlet pipe A (1022), and the drain pipe (1023) all extend out of the outer cylinder (101), a cooling cavity (103) is formed between the outer cylinder (101) and the inner cylinder (102), and an air inlet pipe B (1011) and an air outlet hole (1012) are arranged on the outer cylinder (101) and communicate with the cooling cavity (103). A vortex tube (20) is arranged, and a cold air outlet of the vortex tube (20) is connected to the air inlet pipe B (1011) through a pipeline.

2. The condensation drying device for the gas to be detected of the PID detector according to claim 1, characterized in that, The air inlet pipe A (1021) is arranged close to the bottom of the inner cylinder (102).

3. The device according to claim 1, wherein, The diameter of the air inlet pipe B (1011) is greater than that of the air outlet hole (1012).

4. The condensation drying device for the gas to be detected of a PID detector according to any one of claims 1-3, characterized in that, A condensate water receiving cylinder (30) is further fixedly connected below the drying cylinder (10), and the drain pipe (1023) is inserted into the condensate water receiving cylinder (30).

5. The gas to be measured condensation drying device of a PID detector according to claim 4, characterized in that, An overflow pipe (301) is arranged on the condensate water receiving cylinder (30).

6. The gas to be measured condensation drying device of a PID detector according to claim 5, characterized in that, The water outlet of the overflow pipe (301) is arranged downwardly.

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