Compressor explosion-proof transformation method and explosion-proof compressor

Abstract

The invention belongs to the technical field of liquid variable-capacity machinery, and particularly relates to an explosion-proof transformation method for a compressor and an explosion-proof compressor, and the explosion-proof transformation method for the compressor comprises the steps of carrying out safety evaluation and processing on a compressor body, carrying out explosion-proof transformation on an electrical system, transforming a heating and control part, integrating an explosion-proof electrical control box, and testing and verifying after transformation. The anti-explosion compressor comprises an anti-explosion compressor body meeting the anti-explosion standard, an anti-explosion junction box, an oil pressure difference switch, an anti-explosion electromagnetic valve, an anti-explosion oil heater and a temperature probe are installed on the compressor body, and an anti-explosion electric control box is connected to the outside of the compressor body. And a compressor thermal protector connected with the explosion-proof junction box and a safety barrier electrically connected with the oil pressure difference switch and the temperature probe are arranged in the explosion-proof electrical control box so as to carry out intrinsic safety treatment on the oil pressure difference switch and the temperature probe. According to the invention, a common compressor can be transformed into a compressor meeting the explosion-proof standard requirement under the condition of not increasing too much cost, so that the compressor can be applied to dangerous places, and the application range is widened.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid variable capacity machinery, and in particular relates to an explosion-proof modification method for a compressor and an explosion-proof compressor. Background Art

[0002] The compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is the heart of the refrigeration system and is widely used in automated manufacturing fields such as the petrochemical industry, food processing, air conditioning and refrigeration industry, textile machinery, and pharmaceutical equipment.

[0003] In some specific working environments, such as petrochemical, coal mining, natural gas and other industries, there may be flammable and explosive gases, steam or dust around. During the operation of the compressor, its electrical equipment may generate sparks, and the friction and collision between mechanical parts may also generate sparks. Once these sparks come into contact with flammable and explosive substances, they may cause explosion accidents. However, ordinary compressors lack reliable explosion-proof measures for explosive gases. The supporting electrical equipment will generate sparks during operation, and the oil heater will generate dangerous temperatures. If there are explosive gases or combustible dust around, there will be safety hazards, which can easily cause external dangers. When the ordinary compressor is replaced with an explosion-proof compressor as a whole, the cost of use is increased. Therefore, how to transform the ordinary compressor to meet the explosion-proof standard requirements without increasing too much cost has become a problem that technicians in this field need to solve. Summary of the invention

[0004] The object of the present invention is to provide a compressor explosion-proof modification method and an explosion-proof compressor, so as to solve the technical problem that existing ordinary compressors are prone to potential safety hazards when working in a flammable and explosive environment.

[0005] In order to solve the above problems, the present invention provides a compressor explosion-proof modification method adopting the following technical solutions: A method for explosion-proof modification of a compressor, including safety assessment and treatment of the compressor body, explosion-proof modification of the electrical system, modification of heating and control components, integration of an explosion-proof electrical control box, and post-modification testing and verification; The safety assessment and treatment of the compressor body includes analyzing the working principle of the compressor, testing that the internal environment is a high-pressure environment, no explosive gas enters during operation, there is lubricating oil inside, and the rotating friction parts do not generate sparks; The explosion-proof modification of the electrical system includes replacing the original ordinary junction box with an explosion-proof junction box and relocating the thermal protector in the original ordinary junction box; and also includes performing intrinsic safety treatment on the oil pressure differential switch and the temperature probe at the compressor exhaust port; The heating and control component modification includes replacing the original ordinary oil heater with an explosion-proof oil heater and performing a pouring seal treatment on the original ordinary solenoid valve; The explosion-proof electrical control box integration includes integrating the thermal protector, the safety barrier and the corresponding control components into the explosion-proof electrical control box; The post-modification test and verification include working performance test, explosion-proof performance test and trial operation in a simulated hazardous environment to verify whether the explosion-proof modification of the compressor is successful.

[0006] Preferably, when replacing the explosion-proof junction box, a sealing gasket is installed at the connection between the explosion-proof junction box and the compressor body.

[0007] Preferably, the encapsulant used for encapsulating the internal electrical components of the common solenoid valve is epoxy resin.

[0008] Preferably, the thermal protector moved into the explosion-proof electrical control box is connected to the explosion-proof junction box via a rubber-sheathed cable.

[0009] Furthermore, the safety barrier is electrically connected to the temperature probe and the oil pressure differential switch to supply power to the temperature probe and the oil pressure differential switch.

[0010] The beneficial effects of the explosion-proof modification method for compressors of the present invention are: The present invention firstly carries out safety assessment and processing on the compressor body, and then carries out explosion-proof transformation on the electrical system, heating and control components of the compressor after confirming that the compressor itself meets the explosion-proof standards. Replacing the original ordinary junction box with an explosion-proof junction box can effectively prevent external humid gas from entering, causing dangers such as short circuit sparks at the junction, and further improve safety; the thermal protector of the compressor is moved to the explosion-proof electrical control box, and even if the sparks generated by the thermal protector cause an explosion inside the explosion-proof box, it is only confined to the explosion-proof box and will not cause danger to the surrounding explosion environment. After the oil pressure differential switch is intrinsically safe, the electric sparks and thermal effects generated by it in normal and fault conditions are not enough to ignite the surrounding explosive gas. After the temperature probe is intrinsically safe, it can be transformed into a temperature monitoring device that meets the explosion-proof requirements. The explosion-proof oil heater can effectively prevent the high temperature generated during the heating process from causing the combustion or explosion of the surrounding flammable and explosive materials, and at the same time has perfect temperature control and protection functions to ensure that the oil temperature is always within a safe range. The explosion-proof electrical control box can realize centralized control and monitoring of various components of the compressor, and provide complete protection functions such as overload, short circuit, leakage, etc. Through the explosion-proof modification method of the compressor of the present invention, all the supporting electrical components of the ordinary compressor are changed into explosion-proof electrical products, which meet the requirements of the explosion-proof standards as a whole, can be used in dangerous areas where explosive gases or dust exist, have high safety, and broaden the scope of the use of the compressor. In addition, through the explosion-proof modification method of the compressor of the present invention, there is no need to replace the ordinary compressor with an explosion-proof compressor as a whole, which also saves the use cost.

[0011] A technical solution of an explosion-proof compressor of the present invention is: An explosion-proof compressor comprises a compressor body that meets explosion-proof standards, an explosion-proof junction box, an oil pressure differential switch, an explosion-proof solenoid valve, an explosion-proof oil heater and a temperature probe are installed on the compressor body, an explosion-proof electrical control box is connected to the outside of the compressor body, a compressor thermal protector connected to the explosion-proof junction box is arranged in the explosion-proof electrical control box; a safety barrier electrically connected to the oil pressure differential switch and the temperature probe is also arranged in the explosion-proof electrical control box to perform intrinsic safety treatment on the oil pressure differential switch and the temperature probe.

[0012] Furthermore, a sealing gasket is installed at the connection position between the explosion-proof junction box and the compressor body.

[0013] Furthermore, the internal electrical components of the explosion-proof solenoid valve are encapsulated by epoxy resin.

[0014] Furthermore, the compressor thermal protector is electrically connected to the explosion-proof junction box via a rubber-sheathed cable.

[0015] Furthermore, two safety barriers are provided, one of which is electrically connected to the oil pressure differential switch, and the other is electrically connected to the temperature probe.

[0016] Beneficial effects of an explosion-proof compressor of the present invention: The various electrical components of the explosion-proof compressor of the present invention meet the requirements of explosion-proof standards, can be used in dangerous areas where explosive gas or dust exists, and have low use cost and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 The figure is a schematic diagram of the structure of a compressor transformed by the explosion-proof transformation method of the compressor of the present invention.

[0018] Description of reference numerals: 1. Compressor body; 2. Explosion-proof junction box; 3. Sealing gasket; 4. Rubber-sheathed cable; 5. Explosion-proof electrical control box; 6. Compressor thermal protector; 7. Safety barrier; 8. Oil pressure differential switch; 9. Explosion-proof solenoid valve; 10. Explosion-proof oil heater; 11. Temperature probe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0021] An embodiment of a compressor explosion-proof modification method provided by the present invention: The explosion-proof modification method for compressors includes safety assessment and treatment of the compressor body, explosion-proof modification of the electrical system, modification of heating and control components, integration of explosion-proof electrical control boxes, and post-modification testing and verification.

[0022] 1. Aircraft safety assessment and treatment Comprehensive evaluation: In-depth analysis of the compressor body's structure, working principle, and internal operating environment. Through testing, it was found that the compressor body is in a high-pressure environment with no risk of explosive gas entering during operation, and the internal lubricating oil can effectively suppress the sparks generated by rotating friction parts, so as to judge that it meets the basic provisions of the explosion-proof standard for "safety components". During the test, by setting pressure gauges at the air inlet and exhaust ports of the compressor body, and measuring the pressure values ​​at both locations, when both are greater than atmospheric pressure, it can be judged that the compressor body is in a high-pressure environment. The above evaluation steps are the basis for the entire transformation. Only when the compressor body is identified as a safety component, the subsequent transformation of the electrical components will be meaningful. Because if the body itself has the hidden danger of causing an explosion, even if the electrical components are transformed into explosion-proof types, the entire compressor will not be able to meet the explosion-proof requirements.

[0023] Necessary reinforcement and protection: If the assessment finds that some parts of the compressor body have weak links and may be damaged under the internal high pressure, these parts will be reinforced. For example, high-strength materials are used to thicken key parts or strengthen the supporting structure. At the same time, the body surface is protected to ensure that the oil in the compressor will not leak due to high pressure, and to improve its corrosion and wear resistance to ensure long-term stable operation in harsh environments.

[0024] (II) Explosion-proof transformation of electrical system Junction box replacement: Replace the original ordinary junction box with an explosion-proof junction box that has obtained an explosion-proof certificate. This is because ordinary junction boxes cannot be used in hazardous areas where explosive gases or dust exist, while explosion-proof junction boxes use special sealing designs and materials to effectively prevent internal sparks from contacting external flammable and explosive gases.

[0025] Installing a sealing gasket at the connection between the explosion-proof junction box and the compressor body can further improve the protection level. It can effectively prevent external humid gas from entering and causing dangers such as short circuit sparks at the wiring point, thereby improving the safety level.

[0026] Thermal protector migration: remove the compressor thermal protector from the original ordinary junction box and transfer it to the explosion-proof electrical control box. The thermal protector may generate a certain amount of heat and electrical sparks during operation. Placing it in the explosion-proof electrical control box and utilizing the explosion-proof characteristics of the explosion-proof electrical control box can prevent these possible ignition sources from contacting the external hazardous environment. Even if the sparks generated by the thermal protector cause an explosion inside the explosion-proof box, it is confined to the explosion-proof box and will not cause danger to the surrounding explosive environment. Use rubber-sheathed cables to connect the thermal protector to the original system. Rubber-sheathed cables have good flexibility, insulation and wear resistance, which can ensure stable signal transmission in complex environments while avoiding safety issues caused by line damage.

[0027] Intrinsic safety treatment of oil pressure differential switch: Intrinsic safety treatment is intrinsically safe treatment, which is a technical means to limit the energy in the circuit so that the electric sparks and thermal effects generated in normal and fault conditions cannot ignite the specified explosive gas or dust. The safety barrier is an associated device, which is used to provide an intrinsically safe power supply for the oil pressure differential switch and limit and isolate the input and output signals of the oil pressure differential switch. The safety barrier is set in the explosion-proof electrical control box and is electrically connected to the oil pressure differential switch. By optimizing the circuit design, its energy output is reduced so that the electric sparks and thermal effects generated in normal and fault conditions are not enough to ignite the surrounding explosive gas. It is powered by the safety barrier in the explosion-proof electrical control box. The safety barrier can limit the energy flowing into the oil pressure differential switch to ensure its safety in dangerous environments.

[0028] Intrinsically safe treatment of temperature probe: The ordinary temperature probe at the compressor exhaust port is treated with intrinsic safety, similar to the intrinsic safety treatment of the oil pressure differential switch. Special signal processing circuits and protective measures are used to transform it into a temperature monitoring device that meets explosion-proof requirements. It is also powered by the safety barrier in the explosion-proof electrical control box to ensure accurate transmission of temperature signals and safe operation of the equipment, ensuring that the energy generated by the temperature probe when measuring the compressor exhaust port temperature will not cause an explosion even if a fault occurs. (III) Heating and control component modification Oil heater replacement: Replace the original ordinary oil heater with an explosion-proof oil heater designed specifically for compressors. The explosion-proof oil heater adopts a compressor explosion-proof oil heater disclosed in the Chinese utility model patent with authorization announcement number CN206513527U. This explosion-proof oil heater has been specially designed in structure and materials, which can effectively prevent the high temperature generated during the heating process from causing the combustion or explosion of the surrounding flammable and explosive materials. At the same time, it has perfect temperature control and protection functions to ensure that the oil temperature is always within a safe range.

[0029] Solenoid valve encapsulation treatment: ordinary solenoid valves are encapsulated, and their electrical parts are completely covered with an explosion-proof encapsulant. The encapsulant can isolate the contact between external flammable and explosive gases and the internal electrical components of the solenoid valve, and has good insulation and thermal stability. Even when the solenoid valve fails and generates electric sparks, it can effectively prevent the sparks from igniting the surrounding environment. The encapsulant can be epoxy resin.

[0030] (IV) Integration of explosion-proof electrical control box Centralized control and protection: The modified compressor thermal protector, safety barrier and other related control components are integrated into the explosion-proof electrical control box. The explosion-proof electrical control box is made of high-strength explosion-proof metal materials and has good sealing and explosion isolation performance. Through reasonable layout and wiring, centralized control and monitoring of various compressor components are achieved, while providing complete protection functions such as overload, short circuit, and leakage.

[0031] (V) Post-transformation testing and verification Working performance test: Conduct comprehensive performance tests on the modified compressor, including tests on key parameters such as pressure, exhaust volume, temperature, etc., to ensure that its operating performance under various working conditions meets the actual use requirements, and that its performance does not decrease or improves compared to before the modification.

[0032] Explosion-proof performance test: In accordance with relevant explosion-proof standards and specifications, the modified compressor is strictly tested for explosion-proof performance. The test content includes spark test, temperature test, explosion-proof performance test, etc., to verify that it can effectively prevent explosion accidents in simulated dangerous environments.

[0033] Test run: Test run is carried out in an actual hazardous location or simulated hazardous environment to test the stability of the compressor for a long time. Observe its operation under real working conditions, find and solve possible problems in time, and ensure its safe and reliable operation.

[0034] Through the above series of transformations, all the supporting electrical components of the compressor were replaced with explosion-proof electrical products, and the body was evaluated and identified as meeting the explosion-proof standard requirements of "safety components", so that the modified compressor meets the explosion-proof standard requirements. This not only improves the safety of the compressor, but also greatly broadens the scope of its use, allowing it to operate normally in dangerous areas with explosive gases or dust, meeting the needs of more industrial environments.

[0035] However, it should be noted that the modified compressor needs to undergo rigorous testing and verification before use to ensure the effectiveness and reliability of various modification measures, such as explosion-proof performance testing, electrical performance testing, high-voltage resistance testing, etc., to ensure that no safety accidents will occur when used in dangerous environments. At the same time, during use, it is also necessary to follow the relevant explosion-proof equipment operation and maintenance specifications, and conduct regular inspections and maintenance to ensure that it always meets the explosion-proof requirements.

[0036] Embodiments of the explosion-proof compressor provided by the present invention: like Figure 1 As shown, the explosion-proof compressor includes a compressor body 1 that meets the explosion-proof standard, on which an explosion-proof junction box 2, an oil pressure differential switch 8, an explosion-proof solenoid valve 9, an explosion-proof oil heater 10 and a temperature probe 11 are installed, and the outside of the compressor body 1 is connected to an explosion-proof electrical control box 5, in which a compressor thermal protector 6 connected to the explosion-proof junction box 2 is arranged; the explosion-proof electrical control box 5 is also provided with two safety barriers 7 electrically connected to the oil pressure differential switch 8 and the temperature probe 11 respectively, and the two safety barriers 7 are respectively powered by the oil pressure differential switch 8 and the temperature probe 11, and the oil pressure differential switch 8 and the temperature probe 11 are intrinsically safe.

[0037] In order to further improve the protection level, a sealing gasket 3 is installed at the connection position between the explosion-proof junction box 2 and the compressor body 1 .

[0038] The explosion-proof solenoid valve 9 does not adopt a ready-made explosion-proof solenoid valve 9, but is based on a common solenoid valve, and the internal electrical components are cast and sealed with epoxy resin.

[0039] The compressor thermal protector 6 is electrically connected to the explosion-proof junction box 2 via a rubber-sheathed cable 4 .

[0040] The explosion-proof oil heater 10 adopts a compressor explosion-proof oil heater disclosed in the Chinese utility model patent with the authorization announcement number CN206513527U, which includes a joint, a protective sleeve, a compression nut, a protective rubber ring, a resistance wire assembly and a thermostat, and the connection relationship between the various components is not repeated. The explosion-proof oil heater as a whole is isolated from sparks and the temperature is limited by explosion-proof treatment, which can realize the heating of the compressor oil temperature in explosion-hazardous places, thereby broadening the scope of use of the oil heater, and can be widely used in places with explosive gases and dust hazards, and can also be applied to special working occasions or harsh working environments such as explosion-proof, petrochemical, air conditioning and refrigeration, and mining.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for explosion-proof modification of a compressor, characterized in that: This includes safety assessment and treatment of the compressor body, explosion-proof modification of the electrical system, modification of heating and control components, integration of explosion-proof electrical control boxes, and post-modification testing and verification; The safety assessment and treatment of the compressor body includes analyzing the working principle of the compressor, testing that the internal environment is a high-pressure environment, no explosive gas enters during operation, there is lubricating oil inside, and the rotating friction parts do not generate sparks; The explosion-proof modification of the electrical system includes replacing the original ordinary junction box with an explosion-proof junction box and relocating the thermal protector in the original ordinary junction box; and also includes performing intrinsic safety treatment on the oil pressure differential switch and the temperature probe at the compressor exhaust port; The heating and control component modification includes replacing the original ordinary oil heater with an explosion-proof oil heater and encapsulating the internal electrical components of the original ordinary solenoid valve; The explosion-proof electrical control box integration includes integrating the thermal protector, the safety barrier and the corresponding control components into the explosion-proof electrical control box; The post-modification test and verification include working performance test, explosion-proof performance test and trial operation in a simulated hazardous environment to verify whether the explosion-proof modification of the compressor is successful.

2. A method for explosion-proof modification of a compressor according to claim 1, characterized in that: When replacing the explosion-proof junction box, install a sealing gasket at the connection between the explosion-proof junction box and the compressor body.

3. The explosion-proof modification method for a compressor according to claim 1, characterized in that: The encapsulant used for encapsulating the internal electrical components of ordinary solenoid valves is epoxy resin.

4. A method for explosion-proof modification of a compressor according to any one of claims 1 to 3, characterized in that: The thermal protector moved into the explosion-proof electrical control box is connected to the explosion-proof junction box through a rubber-sheathed cable.

5. A method for explosion-proof modification of a compressor according to any one of claims 1 to 3, characterized in that: The safety barrier is electrically connected to the temperature probe and the oil pressure differential switch to supply power to the temperature probe and the oil pressure differential switch.

6. An explosion-proof compressor, comprising a compressor body that complies with explosion-proof standards, characterized in that: An explosion-proof junction box, an oil pressure differential switch, an explosion-proof solenoid valve, an explosion-proof oil heater and a temperature probe are installed on the compressor body. An explosion-proof electrical control box is connected to the outside of the compressor body. A compressor thermal protector connected to the explosion-proof junction box is arranged in the explosion-proof electrical control box. A safety barrier electrically connected to the oil pressure differential switch and the temperature probe is also arranged in the explosion-proof electrical control box to perform intrinsic safety treatment on the oil pressure differential switch and the temperature probe.

7. An explosion-proof compressor according to claim 6, characterized in that: A sealing gasket is installed at the connection position between the explosion-proof junction box and the compressor body.

8. An explosion-proof compressor according to claim 6, characterized in that: The internal electrical components of the explosion-proof solenoid valve are sealed by epoxy resin.

9. An explosion-proof compressor according to any one of claims 6 to 8, characterized in that: The compressor thermal protector is electrically connected to the explosion-proof junction box via a rubber-sheathed cable.

10. An explosion-proof compressor according to any one of claims 6 to 8, characterized in that: The safety barriers are provided with two, one of which is electrically connected to the oil pressure difference switch, and the other is electrically connected to the temperature probe.

Images