Gas detector with electric heating and dehumidifying functions
By integrating the electric heating and dehumidification function in the gas detector, the resistive heating plate heats up on the inner shell of the probe, solving the detection deviation problem caused by condensation in high humidity environments, and achieving simplified design and low-cost use of the equipment.
Patent Information
- Application Number
- CN202421658952.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-12
AI Technical Summary
Existing gas detectors are prone to condensed dew in high humidity environments, resulting in numerical deviations in detection, and conventional solutions have problems such as large space consumption, high energy consumption and high cost.
A gas detector with its own electric heating and dehumidification function was designed. The resistive heating plate heated on the inner shell and outer wall of the probe to form a heating cavity to avoid condensation on the surface of the sensor and simplify the assembly process through the overall design.
Effectively prevent condensation of the surface of the inner shell sensor of the probe, ensure detection accuracy, and reduce the complexity of the equipment and the assembly work of users, meeting the needs of miniaturization, low energy consumption and low cost.
Smart Images
Figure CN222896149U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas detectors, in particular to a gas detector with an electric heating and dehumidification function. Background Art
[0002] Gas detectors (also known as gas detectors, gas detection alarms, etc.) are used to detect combustible gases, toxic gases, oxygen, etc., and are widely used in many industrial and commercial fields. The main detection principles of gas detectors are: catalytic combustion, infrared, electrochemical, and PID photoionization.
[0003] Most gas detector products require the relative humidity of the working environment to be less than 95% RH, especially for electrochemical and PID photoionization products. If the relative humidity of the working environment is too high, such as at the seaside or in the humid climate of the south, condensation is likely to form on the surface of the gas detector's detection probe. The detection probe contains a sensor, which is the core component of the gas detector and is also a component that will be affected by relative humidity. In the presence of condensation, the detection values of electrochemical and PID photoionization gas detectors are likely to deviate greatly, even more than ten times. Therefore, in order to avoid condensation on the surface of the gas detector's detection probe, the current conventional method is: 1. Dehumidify the working environment of the gas detector, such as using a dehumidifier to reduce the overall humidity of the environment to be detected; 2. Install the gas detector in a small box, and then install a small electric heater in the small box to heat and dehumidify the inside of the small box, including the gas detector as a whole. This solution has several major disadvantages: 1. Because the entire gas detector needs to be placed, the small box is relatively large and occupies a large space; 2. The energy consumption is relatively large; 3. The overall cost is relatively high.
[0004] The applicant of the utility model has previously applied for a patent: a device for dehumidifying a fixed gas detector, which applied for a device that only heats the local working condition gas detected by the detection probe of the fixed gas detector, achieving the purpose of avoiding condensation on the surface of the detection probe of the gas detector. However, the device achieves the purpose of heating the local working condition gas of the detection probe of the existing gas detector through an adapter and an electric heating dehumidifier. The main purpose of the design of this device is to be used for the existing fixed gas detectors on the market. The gas detector and the electric heating dehumidifier are connected through an adaptive adapter. Therefore, it is not a complete gas detector device with electric heating and dehumidification function. It has many spare parts and is relatively complicated to assemble.
[0005] This design has developed a gas detector with electric heating and dehumidification function. Its detection probe and dehumidification equipment are used in conjunction with each other. It is a complete gas detector with electric heating and dehumidification function. It can be produced and used as a complete gas detector with electric heating and dehumidification function to meet the needs of customers in different situations. This instrument can not only avoid condensation on the sensor surface inside the probe cavity, but also users can use it directly after purchasing the whole device without assembly, which is simple and easy. Utility Model Content
[0006] In order to solve the above technical problems, the utility model provides a gas detector with built-in electric heating and dehumidification function, which effectively prevents condensation from forming on the sensor surface inside the inner shell of the probe and can be used directly without assembly.
[0007] The utility model solves the above-mentioned technical problems as follows:
[0008] A gas detector with electric heating and dehumidification function, including an instrument head, a probe housing, a resistance heating sheet, a probe inner housing, an adapter and a sensor;
[0009] The probe shell is a through-type structure, wherein a joint through-hole is formed at the upper end of the probe shell, an instrument header is fixedly connected to the upper end of the probe shell, a lower end of the probe shell covers the probe inner shell, an outer wall of the adapter is fixedly connected to the inner wall of the probe shell, an inner wall of the adapter is fixedly connected to the outer wall of the probe inner shell, a heating cavity is formed between the probe shell, the probe inner shell and the adapter, a resistance heating sheet is located in the heating cavity, the resistance heating sheet is attached to the outer wall of the probe inner shell, and a power line of the resistance heating sheet passes through the joint through-hole and is connected to the instrument header;
[0010] The probe inner shell is a through structure from top to bottom to form a probe cavity. A wiring hole is formed at the upper end of the probe inner shell. The sensor is located in the probe cavity. The cable of the sensor passes through the wiring hole and the connector through hole to be connected to the instrument header.
[0011] This design supplies power to the resistance heating piece through a power cord, and the resistance heating piece generates heat. Since the inner shell of the probe is made of stainless steel or aluminum alloy, the resistance heating piece fits the outer wall of the inner shell of the probe, and the temperature of the entire inner shell of the probe rises rapidly. Therefore, the working gas in the probe cavity is heated, and its temperature is higher than the temperature of the initial working gas introduced, preventing condensation on the sensor surface in the probe cavity, thereby ensuring the accuracy of the working gas value detected by the sensor.
[0012] Further, the adapter is a ring with internal and external threads, the outer wall of which is connected to the inner wall of the probe shell by threads, and the inner wall of which is connected to the outer wall of the probe inner shell by threads. It is understandable that the adapter can also be a ring without internal and external threads, the outer wall of which is connected to the inner wall of the probe shell by gluing, and the inner wall of which is connected to the outer wall of the probe inner shell by gluing. The adapter can also be other shapes, as long as it can be embedded between the probe shell and the probe inner shell to form a sealed heating cavity between the probe shell, the probe inner shell and the adapter.
[0013] Furthermore, the adapter is made of plastic material, has good heat insulation, reduces heat conduction from the inner shell of the probe to the outer shell of the probe, and has good corrosion resistance.
[0014] Furthermore, the sensor includes a sensor seat at the top, the sensor seat blocks the wiring hole, and the sensor pin is inserted into the pin hole of the sensor seat to connect the cable of the sensor.
[0015] Furthermore, the sensor seat is fixed to the top surface of the probe inner shell by gluing to block the wiring hole. The gluing can be performed by gluing the sensor seat to the wiring hole with synthetic resin.
[0016] Furthermore, a removable lower cover is installed at the lower end of the inner shell of the probe, and the lower cover is threadedly connected to the lower end of the inner shell of the probe to cover the interior of the inner shell of the probe, and the lower cover is provided with an air vent for gas to pass through. The air vent ensures that the initial working condition gas to be detected can freely enter and exit the interior of the probe cavity. When the gas detector is installed in a closed working condition such as indoors, the gas detector with its own electric heating and dehumidification function may not be installed with a lower cover. At this time, there is no harsh working gas environment such as wind, rain, dust, etc. outdoors, but the working gas environment may still have a high relative humidity. Therefore, the gas detector with its own electric heating and dehumidification function may not be installed with a lower cover, and only needs to use a resistance heating plate for heating and dehumidification. The main purpose of the lower cover is to prevent larger particulate matter such as rainwater and branches from entering the interior of the probe cavity in a harsh working gas environment such as outdoors.
[0017] Furthermore, a filter membrane for filtering dust and water vapor is disposed inside the lower cover. The filter membrane can further filter fine dust and water vapor, ensuring that the initial working gas entering the probe cavity has few impurities, and ensuring the accuracy of the working gas value detected by the sensor in the probe cavity.
[0018] Furthermore, a positioning ring is extended upward from the top surface of the joint through hole, and a positioning hole matching the positioning ring is provided at the lower end of the instrument head. The positioning ring is threadedly connected to the positioning hole, thereby fixing the instrument head to the upper end of the probe housing.
[0019] Furthermore, the inner shell of the probe is made of stainless steel or aluminum alloy, which has good thermal conductivity and corrosion resistance, and the outer shell of the probe is made of stainless steel or aluminum alloy, which is firm and has good corrosion resistance.
[0020] The utility model has the following advantages over the prior art:
[0021] 1. The gas detector with electric heating and dehumidification function designed in this design includes an instrument head, a probe housing, a resistance heating sheet, a probe inner housing, an adapter and a sensor. It is a complete gas detector with electric heating and dehumidification function, which can be produced and used as a complete gas detector with electric heating and dehumidification function to meet the needs of customers in different situations. This gas detector can not only avoid condensation on the sensor surface inside the probe cavity, but also users can directly use it after purchasing the whole device without assembly, which is simple and easy.
[0022] 2. The gas detector with built-in electric heating and dehumidification function of this design is reasonably designed. It only heats the probe cavity where the sensor is installed to prevent the sensor from being affected by condensation in the initial working gas, meeting the advantages of miniaturization, low energy consumption and low cost.
[0023] 3. The gas detector with built-in electric heating and dehumidification function of this design can be used for the detection of harsh working conditions such as wind, rain, dust, etc. outdoors, and can also be used for the detection of closed working conditions such as indoors, with a wide range of applications.
[0024] 4. The resistance heating plate in this design is located in the heating cavity, and the heating cavity is a closed space formed by the probe outer shell, the probe inner shell and the adapter, which can be dustproof and waterproof.
[0025] 5. The inner shell of the probe is made of stainless steel or aluminum alloy, which has good thermal conductivity and corrosion resistance. The outer shell of the probe is made of stainless steel or aluminum alloy, which is firm and has good corrosion resistance.
[0026] The terms used herein, such as "inside" and "outside", indicating relative spatial positions, are used for the purpose of convenience to describe the relationship of one feature relative to another feature as shown in the drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations in addition to the orientation shown in the drawings, and should not be construed as limiting the claims. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the structure of the gas detector with built-in electric heating and dehumidification function of Example 1.
[0028] Figure 2 This is a cross-sectional view of Example 1.
[0029] Figure 3 This is an exploded view of Example 1.
[0030] Figure 4 yes Figure 3 Cross-sectional view of .
[0031] Figure 5 yes Figure 3 sectional view of . DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] Embodiment 1:
[0034] A gas detector with electric heating and dehumidification function includes an instrument head 1, a probe housing 2, a resistance heating sheet 3, a probe inner housing 4, an adapter 5 and a sensor 7;
[0035] The probe housing 2 is a through structure from top to bottom, a joint through hole 2-2 is formed at the upper end of the probe housing 2, the instrument header 1 is fixedly connected to the upper end of the probe housing 2, the lower end of the probe housing 2 covers the probe inner housing 4, the outer wall of the adapter 5 is fixedly connected to the inner wall of the probe housing 2, the inner wall of the adapter 5 is fixedly connected to the outer wall of the probe inner housing 4, a heating cavity 2-3 is formed between the probe housing 2, the probe inner housing 4 and the adapter 5, the resistance heating sheet 3 is located in the heating cavity 2-3, the resistance heating sheet 3 is attached to the outer wall of the probe inner housing 4, and the power line 3-1 of the resistance heating sheet 3 passes through the joint through hole 2-2 and is connected to the instrument header 1;
[0036] The probe inner shell 4 is a through structure from top to bottom, forming a probe cavity 4-2. A wiring hole 4-1 is formed at the upper end of the probe inner shell 4. The sensor 7 is located in the probe cavity 4-2. The cable 6-1 of the sensor 7 passes through the wiring hole 4-1 and the connector through hole 2-2 to be connected to the instrument head 1.
[0037] In this design, the resistance heating plate 3 is powered by the power cord 3-1, and the resistance heating plate 3 generates heat. Since the probe inner shell 4 is made of aluminum alloy, the resistance heating plate 3 fits the outer wall of the probe inner shell 4, and the temperature of the entire probe inner shell 4 rises rapidly. Therefore, the working gas in the probe cavity 4-2 is heated, and its temperature is higher than the temperature of the initial working gas introduced, thereby preventing condensation from forming on the surface of the sensor 7 in the probe cavity 4-2, thereby ensuring the accuracy of the working gas value detected by the sensor 7.
[0038] In this embodiment, the adapter 5 is a circular ring with internal and external threads, whose outer wall is connected to the inner wall of the probe housing 2 through threads, and whose inner wall is connected to the outer wall of the probe inner housing 4 through threads, so that a sealed heating cavity 2-3 is formed between the probe housing 2, the probe inner housing 4 and the adapter 5.
[0039] In this embodiment, the adapter 5 is made of plastic material, which has good heat insulation, reduces heat conduction from the probe inner shell 4 to the probe outer shell 2, and has good corrosion resistance.
[0040] In this embodiment, the sensor 7 includes a sensor seat 6 at the top, the sensor seat 6 blocks the wiring hole 4 - 1 , and the pin 7 - 1 of the sensor 7 is inserted into the pin hole 6 - 2 of the sensor seat 6 to connect the cable 6 - 1 of the sensor 7 .
[0041] In this embodiment, the sensor seat 6 is fixed to the top surface of the probe inner shell 4 by gluing to block the wiring hole 4-1. The gluing is to gluing the sensor seat 6 to the wiring hole 4-1 with synthetic resin.
[0042] In this embodiment, a removable lower cover 9 is also installed at the lower end of the probe inner shell 4, and the lower cover 9 is threadedly connected to the lower end of the probe inner shell 4 to cover the inside of the probe inner shell 4. The lower cover 9 is provided with an air vent 9-2 for gas to pass through. The air vent 9-2 ensures that the initial working condition gas to be detected can freely enter and exit the inside of the probe cavity 4-2. When the gas detector is installed in a closed working condition such as indoors, the gas detector with its own electric heating and dehumidification function can be installed without the lower cover 9. At this time, there is no harsh working condition gas environment such as wind, rain, dust, etc. outdoors, but the working condition gas environment may still have a high relative humidity. Therefore, the gas detector with its own electric heating and dehumidification function can be installed without the lower cover 9, and only the resistance heating sheet 3 needs to be used for heating and dehumidification. The main purpose of the lower cover 9 is to prevent larger particulate matter such as rainwater and branches from entering the probe cavity 4-2 in a harsh working condition gas environment such as outdoors.
[0043] In this embodiment, a filter membrane 8 for filtering dust and water vapor is disposed inside the lower cover 9. The filter membrane 8 can further filter fine dust and water vapor, ensuring that the initial working condition gas entering the probe cavity 4-2 has few impurities, and ensuring the accuracy of the working condition gas value detected by the sensor 7 in the probe cavity 4-2.
[0044] In this embodiment, a positioning ring 2-1 extends upward from the top surface of the connector through hole 2-2, and a positioning hole 1-1 cooperating with the positioning ring 2-1 is provided at the lower end of the instrument head 1. The positioning ring 2-1 is threadedly connected to the positioning hole 1-1, thereby fixing the instrument head 1 to the upper end of the probe housing 2.
[0045] In this embodiment, the probe inner shell 4 is made of aluminum alloy, which has good thermal conductivity and good corrosion resistance, and the probe outer shell 2 is made of stainless steel, which is firm and has good corrosion resistance.
[0046] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.
Claims
1. Gas detector with electric heating and dehumidification function, characterized by: It includes an instrument head, a probe housing, a resistance heating sheet, a probe inner housing, an adapter and a sensor; The probe shell is a through-type structure, wherein a joint through-hole is formed at the upper end of the probe shell, an instrument header is fixedly connected to the upper end of the probe shell, a lower end of the probe shell covers the probe inner shell, an outer wall of the adapter is fixedly connected to the inner wall of the probe shell, an inner wall of the adapter is fixedly connected to the outer wall of the probe inner shell, a heating cavity is formed between the probe shell, the probe inner shell and the adapter, a resistance heating sheet is located in the heating cavity, the resistance heating sheet is attached to the outer wall of the probe inner shell, and a power line of the resistance heating sheet passes through the joint through-hole and is connected to the instrument header; The probe inner shell is a through structure from top to bottom to form a probe cavity. A wiring hole is formed at the upper end of the probe inner shell. The sensor is located in the probe cavity. The cable of the sensor passes through the wiring hole and the connector through hole to be connected to the instrument header.
2. The gas detector with electric heating and dehumidification function according to claim 1 is characterized in that: The adapter is a circular ring with internal and external threads, the outer wall of which is connected to the inner wall of the probe housing through threads, and the inner wall of which is connected to the outer wall of the probe inner housing through threads.
3. The gas detector with electric heating and dehumidification function according to claim 1 is characterized in that: The adapter is made of plastic.
4. The gas detector with electric heating and dehumidification function according to claim 1 is characterized in that: The sensor comprises a sensor seat at the top, the sensor seat blocks the wiring hole, and the sensor pin is inserted into the pin hole of the sensor seat to connect the cable of the sensor.
5. The gas detector with electric heating and dehumidification function according to claim 4 is characterized in that: The sensor seat is fixed to the top surface of the probe inner shell by gluing, blocking the wiring hole.
6. The gas detector with electric heating and dehumidification function according to claim 1 is characterized in that: A detachable lower cover is also installed at the lower end of the probe inner shell. The lower cover is threadedly connected to the lower end of the probe inner shell to cover the interior of the probe inner shell. The lower cover is provided with a vent hole for gas to pass through.
7. The gas detector with electric heating and dehumidification function according to claim 6 is characterized in that: A filter membrane for filtering dust and water vapor is arranged inside the lower cover.
8. The gas detector with electric heating and dehumidification function according to claim 1 is characterized in that: A circle of positioning ring is extended upward from the top surface of the joint through hole, and a positioning hole matching with the positioning ring is arranged at the lower end of the instrument head, and the positioning ring is threadedly connected with the positioning hole.
9. The gas detector with electric heating and dehumidification function according to claim 1, characterized in that: The inner shell of the probe is made of stainless steel or aluminum alloy, and the outer shell of the probe is made of stainless steel or aluminum alloy.