A gas recovery and inflation device

Abstract

The present application belongs to the field of gas recovery and inflation equipment, and particularly relates to a gas recovery and inflation device, which comprises a gas storage device interface and an equipment interface, the gas storage device interface is used for being connected with a gas storage device, the equipment interface is used for being connected with a gas equipment, a recovery branch is arranged between the gas storage device interface and the equipment interface, a vacuum extraction branch is further arranged, a first compressor and a first valve located upstream of the first compressor are arranged on the recovery branch along the flow direction of the gas during recovery, the vacuum extraction branch is connected in parallel on the recovery branch, one end is connected upstream of the first valve, and the other end is connected between the first compressor and the first valve, a vacuum compressor and an exhaust branch located downstream of the vacuum compressor are arranged on the vacuum extraction branch, the second valve for controlling the on-off of the exhaust branch is arranged on the exhaust branch, and the vacuum extraction branch and the recovery branch share the vacuum compressor, so that the production and manufacturing cost of the gas recovery and inflation device is reduced.

Description

Technical Field

[0001] This invention belongs to the field of gas recovery and inflation equipment, and in particular relates to a gas recovery and inflation device. Background Technology

[0002] SF6 (or a mixture of SF6 and other gases) is used as the insulating medium in GIS (Gas Insulated Switchgear). SF6 gas is extremely harmful to the atmospheric environment; its greenhouse effect is the strongest known greenhouse gas, with a Global Warming Potential (GWP) 23,900 times that of carbon dioxide, and an atmospheric lifetime of over 3,200 years. Therefore, specialized equipment is needed for SF6 recovery, and specialized equipment is also required when filling the equipment with SF6.

[0003] For example, Chinese invention patent CN107588325B, published on September 13, 2019, discloses a sulfur hexafluoride gas recovery and charging device. This device has a vacuuming branch, a recovery branch, and a charging branch. A vacuum pump is installed on the vacuuming branch, and a main compressor and a booster compressor are installed on the recovery branch. To ensure low-temperature recovery, a radiator and a refrigeration unit are also installed on the recovery branch. To achieve gaseous charging, a heater is installed on the charging branch. Such equipment can achieve vacuuming of the device to be charged, recovery of SF6 gas, and charging. However, the separate installation of a vacuum pump, main compressor, and booster compressor to meet these functions results in a high manufacturing cost for the sulfur hexafluoride gas recovery and charging device. Summary of the Invention

[0004] The purpose of this invention is to provide a gas recovery and filling device to solve the technical problem of high manufacturing cost of sulfur hexafluoride gas recovery and filling devices in the prior art.

[0005] To achieve the above objectives, the technical solution of the gas recovery and inflation device provided by the present invention is as follows:

[0006] A gas recovery and charging device includes a gas storage device interface and a device interface. The gas storage device interface is used to connect to a gas storage device, and the device interface is used to connect to a gas-using device. A recovery branch is provided between the gas storage device interface and the device interface, along the gas flow direction during gas recovery. A first compressor and a first valve located upstream of the first compressor are provided on the recovery branch. The gas recovery and charging device also includes a vacuum branch provided between the gas storage device interface and the device interface. The vacuum branch is connected in parallel to the recovery branch, with one end connected upstream of the first valve and the other end connected between the first compressor and the first valve. A second compressor, which is a vacuum compressor, is provided on the vacuum branch, as well as an exhaust branch located downstream of the vacuum compressor. A second valve for controlling the opening and closing of the exhaust branch is provided on the exhaust branch.

[0007] The beneficial effects are as follows: A vacuum branch is connected in parallel to the recovery branch, and the vacuum branch is connected in parallel with the first valve on the recovery branch. This allows for efficient gas recovery initially, when the internal pressure is relatively high. The first valve is opened, and only the first compressor on the recovery branch performs gas recovery. When some gas has been recovered and the pressure is low, the first valve can be closed, and the vacuum compressor can be turned on to work in conjunction with the first compressor on the recovery branch, achieving more thorough gas recovery from the gas-using equipment. When it is necessary to evacuate the internal cavity of the gas-using equipment, the first valve is closed, the second valve is opened, and the vacuum compressor operates to evacuate the internal cavity. In this way, the vacuum compressor is used for both gas recovery and vacuuming, eliminating the need for a dedicated vacuum pump and reducing the manufacturing costs of the gas recovery and charging devices.

[0008] As a further improvement, the recovery branch is equipped with a refrigeration and heating device that integrates refrigeration and heating functions. The gas recovery and charging device also includes a first charging branch and a second charging branch connected in parallel with the recovery branch. The first charging branch is connected in parallel with the refrigeration and heating device. Along the gas flow direction during gas recovery, the end of the first charging branch upstream of the refrigeration and heating device is defined as the first connection end, and the end downstream of the refrigeration and heating device is defined as the second connection end. One end of the second charging branch is connected between the refrigeration and heating device and the second connection end, and the other end is connected between the first connection end and the equipment interface.

[0009] The beneficial effects are as follows: When it is necessary to recover the gas inside the gas-using equipment, the first compressor on the recovery branch works to recover the gas. When the recovered gas passes through the refrigeration and heating device, the refrigeration and heating device executes the refrigeration mode, which can cool and liquefy the gas, thus achieving cooling or liquefaction recovery. When it is necessary to charge the gas-using equipment, the gas flows through the first charging branch to the recovery branch, and then from the recovery branch to the second charging branch. Specifically, the gas flows sequentially through the first charging branch, the first connecting end, the refrigeration and heating device, the second connecting end, and the second charging branch. When the gas flows through the refrigeration and heating device, the refrigeration and heating device executes the heating mode to heat and vaporize the gas. In this way, the charging and gas recovery share a single refrigeration and heating device, eliminating the need for separate heating and refrigeration devices, saving parts, reducing costs, and making the structure of the gas recovery and charging device simpler.

[0010] As a further improvement, the end of the second inflation branch located between the refrigeration / heating device and the second connection end is defined as the third connection end, and the gas recovery and inflation device also includes a filter disposed between the third connection end and the first connection end.

[0011] The beneficial effects are: both gas recovery and filling can pass through the filter, and the gas moisture and decomposition products are purified twice, improving the quality of the gas.

[0012] As a further improvement, the filter is disposed between the third connection end and the cooling / heating device.

[0013] The beneficial effects are: by placing the filter downstream of the refrigeration and heating device, it is convenient to filter the moisture in the liquefied gas when recovering the gas, and to filter the moisture in the filling material before heating and vaporizing it during the filling process.

[0014] As a further improvement, along the gas flow direction during gas recovery, the refrigeration and heating device is located downstream of the first compressor, and a pressure detection element for monitoring the pressure at the outlet of the first compressor is provided at the outlet of the first compressor.

[0015] The beneficial effect is that by setting up a pressure detection element to monitor the pressure at the outlet of the first compressor, the first compressor can be stopped in time when the pressure at the outlet of the first compressor is so high that it may damage other working parts of the downstream switch.

[0016] As a further improvement, the pressure detection element includes a pressure gauge and a pressure sensor, and the gas recovery and inflation device also includes a control system, wherein the pressure sensor is connected to the controller signal transmission of the control system.

[0017] The beneficial effects are: setting up a control system and installing a pressure sensor for that system enables intelligent monitoring of the gas path. Simultaneously, the installation of a pressure gauge ensures that operators can still promptly ascertain the pressure at the outlet of the first compressor even in the event of a control system malfunction.

[0018] As a further improvement, along the gas flow direction during gas recovery, a temperature control device capable of cooling the gas is installed downstream of the first compressor on the recovery branch, and a pressure detection element for monitoring the pressure at the outlet of the first compressor is installed at the outlet of the first compressor.

[0019] The beneficial effect is that by setting up a pressure detection element to monitor the pressure at the outlet of the first compressor, the first compressor can be stopped in time when the pressure at the outlet of the first compressor is so high that it may damage other working parts of the downstream switch.

[0020] As a further improvement, the second inflation branch is equipped with a pressure detection element for detecting the internal pressure of the gas-using equipment.

[0021] The beneficial effects are: by setting up a pressure detection element, when the internal pressure of the gas-using equipment is high, the internal pressure of the equipment can be known in time and the vacuuming operation can be avoided, thus preventing damage to the vacuum compressor. Furthermore, by placing the pressure detection element on the gas charging branch, the failure rate of the vacuuming branch can be reduced.

[0022] As a further improvement, the pressure detection element includes a pressure sensor and a pressure gauge, and the gas recovery and inflation device also includes a control system, wherein the pressure sensor is connected to the controller of the control system for signal transmission.

[0023] The beneficial effects are: setting up a control system and installing a pressure sensor for that system enables intelligent monitoring of the gas path. Simultaneously, installing a pressure gauge ensures that operators can still promptly know the pressure inside the gas-using equipment even if the control system malfunctions.

[0024] As a further improvement, the gas recovery and inflation device also includes a pressure detection element for detecting the pressure inside the gas-using equipment.

[0025] The beneficial effects are: by setting up pressure detection elements, when the internal pressure of the gas-using equipment is high, the internal pressure of the equipment can be known in time and the vacuuming operation can be avoided, thus preventing damage to the vacuum compressor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the gas path structure of Embodiment 1 of the gas recovery and inflation device in this invention;

[0027] Figure 2This is the gas flow path in vacuum mode of Embodiment 1 of the gas recovery and inflation device of the present invention;

[0028] Figure 3 This is the gas flow path during positive pressure recovery in the gas recovery mode of Embodiment 1 of the gas recovery and inflation device of the present invention;

[0029] Figure 4 This is the gas flow path during negative pressure recovery in the gas recovery mode of Embodiment 1 of the gas recovery and inflation device of the present invention;

[0030] Figure 5 This is the gas flow path in the inflation mode of Embodiment 1 of the gas recovery and inflation device of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Gas storage device interface; 2. Equipment interface; 3. Recovery branch; 4. First solenoid valve; 5. First compressor; 6. First pressure gauge; 7. First pressure sensor; 8. Second solenoid valve; 9. Cooling and heating device; 10. First filter; 11. Third solenoid valve; 12. Vacuuming branch; 13. Fourth solenoid valve; 14. Vacuum compressor; 15. Fifth solenoid valve; 16. Exhaust branch; 17. Sixth solenoid valve; 18. First charging branch; 19. Second charging branch; 20. Seventh solenoid valve; 21. Eighth solenoid valve; 22. Pressure reducer; 23. Second pressure sensor; 24. Second pressure gauge; 25. Vacuum gauge; 26. Second filter; 27. Cooling and heating module; 28. Heat exchanger. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0038] The present invention will be further described in detail below with reference to the embodiments.

[0039] The specific embodiment 1 of the gas recovery and filling device provided by the present invention takes the recovery, filling and vacuuming of SF6 in GIS as an example to introduce the gas recovery and filling device of the present invention.

[0040] like Figure 1As shown, the gas recovery and charging device includes a gas storage device interface 1 and an equipment interface 2. The gas storage device interface 1 is used to connect to the gas storage device, and the equipment interface 2 is used to connect to the GIS. A recovery branch 3 is provided between the gas storage device interface 1 and the equipment interface 2. Along the gas flow direction during gas recovery, the recovery branch 3 is sequentially equipped with a first solenoid valve 4, a first compressor 5, a first pressure gauge 6, a first pressure sensor 7, a second solenoid valve 8, a cooling / heating device 9, a first filter 10, and a third solenoid valve 11. The cooling / heating device 9 includes a cooling / heating module 27 and a heat exchanger 28 connected in series on the recovery branch 3. The structure of the cooling / heating device 9 can be referenced from an air conditioner with cooling and heating functions. The first pressure gauge 6 and the first pressure sensor 7 constitute pressure detection elements for monitoring the gas pressure at the outlet of the first compressor 5. The first solenoid valve 4 constitutes the first valve on the recovery branch 3.

[0041] A vacuum branch 12 is connected in parallel to the recovery branch 3. Specifically, the vacuum branch 12 is connected in parallel with the first solenoid valve 4, with one end connected between the first solenoid valve 4 and the equipment interface 2, and the other end connected between the first solenoid valve 4 and the first compressor 5. A fourth solenoid valve 13, a second compressor, and a fifth solenoid valve 15 are sequentially arranged on the vacuum branch 12. The second compressor is specifically a vacuum compressor 14. An exhaust branch 16 is arranged between the vacuum compressor 14 and the fifth solenoid valve 15, and a sixth solenoid valve 17 is arranged on the exhaust branch. The sixth solenoid valve 17 constitutes the second valve on the exhaust branch 16.

[0042] The recovery branch 3 is also connected in parallel to a first inflation branch 18 and a second inflation branch 19. The first inflation branch 18 is connected in parallel with the cooling / heating device 9, with one end connected between the cooling / heating device 9 and the second solenoid valve 8 (this connection end is the first connection end), and the other end connected between the third solenoid valve 11 and the gas storage device interface 1 (this connection end is the second connection end). A seventh solenoid valve 20 is installed on the first inflation branch 18. One end of the second inflation branch 19 is connected between the first filter 10 and the third solenoid valve 11, and the other end is connected between the first solenoid valve 4 and the equipment interface 2. An eighth solenoid valve 21, a pressure reducer 22, a second pressure sensor 23, a second pressure gauge 24, and a vacuum gauge 25 are sequentially arranged on the second inflation branch 19 along the direction gradually approaching the equipment interface 2. At the same time, a second filter 26 is installed at the connection point between the second inflation branch 19 and the recovery branch 3. The second pressure sensor 23 and the second pressure gauge 24 constitute pressure detection elements for monitoring the gas pressure inside the gas-using equipment after connection with the gas-using equipment.

[0043] The gas recovery and inflation device of the present invention also includes a control system. The controller of the control system is connected to the signal transmission of each pressure sensor and is connected to the control of each solenoid valve, the first compressor 5, the refrigeration and heating device 9, and the vacuum compressor 14.

[0044] Based on the above structure, the gas recovery and inflation device of the present invention has the following operating modes:

[0045] Vacuum mode:

[0046] Connect device interface 2 to the GIS air chamber, activate the vacuum function, open the fourth solenoid valve 13 and the sixth solenoid valve 17, start the vacuum compressor 14, and close the first solenoid valve 4, the fifth solenoid valve 15, and the eighth solenoid valve 21. The air in the GIS air chamber is discharged into the atmosphere through device interface 2, the second filter 26, the fourth solenoid valve 13, the vacuum compressor 14, and the sixth solenoid valve 17. The gas flow path is as follows: Figure 2 As shown. Vacuum gauge 25 measures the vacuum level in real time, and the second pressure sensor 23 measures the pressure value in real time.

[0047] After connecting device interface 2 to the GIS air chamber, if the pressure value measured by the second pressure sensor 23 exceeds 0.12 MPa (absolute pressure), the control system will prevent the fourth solenoid valve 13, vacuum compressor 14, and solenoid valve 17 from opening, and the vacuuming function will not operate to protect the vacuum compressor 14 from damage by positive pressure. When the pressure value measured by the second pressure sensor 23 does not exceed 0.12 MPa (absolute pressure), the vacuuming function can operate normally. The second pressure gauge 24 is used for operators to directly read the pressure value, ensuring that operators can know the pressure inside the GIS cavity in the event of a control system failure.

[0048] Gas recovery mode:

[0049] Connect device interface 2 to the GIS gas chamber, and connect the gas storage tank or cylinder to the gas storage device interface 1 to start the recovery function. The first compressor 5 starts, the cooling / heating module 27 starts its cooling function, the second solenoid valve 8 and the third solenoid valve 11 open. When the pressure measured by the second pressure sensor 23 is not lower than 0.12 MPa (absolute pressure), the first solenoid valve 4 opens, initiating positive pressure recovery. The gas flow path is as follows: Figure 3 As shown, when the gas in the GIS chamber gradually decreases, and the pressure measured by the second pressure sensor 23 reaches 0.12 MPa (absolute pressure), the control system controls the fourth solenoid valve 13 and the fifth solenoid valve 15 to open, the sixth solenoid valve 17 to close, the vacuum compressor 14 to start, and the first solenoid valve 4 to close, initiating negative pressure recovery. The gas flow path is as follows. Figure 4 As shown, the vacuum gauge 25 can measure the vacuum level in real time. When the vacuum level in the GIS gas chamber reaches the required level, the recovery function is turned off. Based on the above structure and working method, the first compressor 5 can be set to a conventional compressor without vacuuming capability.

[0050] During the recovery process, the refrigeration and heating device 9 continuously operates its cooling function, continuously cooling the recovered SF6 gas within the heat exchanger 28, enabling rapid liquefaction even at high ambient temperatures. As the gas flows through the first filter 10, impurities such as moisture and SF6 decomposition products are initially adsorbed by the adsorbent within the filter 10, ensuring preliminary purification of the SF6 gas before final storage. When the first pressure sensor 7 detects that the outlet pressure of the first compressor 5 exceeds the permissible pressure value, the control system initiates an emergency shutdown of the recovery function to prevent high-pressure damage to downstream components of the first compressor 5.

[0051] Inflation mode:

[0052] Connect device interface 2 to the GIS gas chamber, and connect the gas storage tank or cylinder to the gas storage device interface 1. Start the filling function. Start the heating function of the cooling / heating device 9, open the seventh solenoid valve 20 and the eighth solenoid valve 21, and adjust the pressure regulator 22 to fill the GIS. The gas in the gas storage tank or cylinder flows through the gas storage device interface 1, the seventh solenoid valve 20, the heat exchanger 28, the first filter 10, the eighth solenoid valve 21, the pressure regulator 22, and device interface 2, filling the GIS. The gas flow path is as follows: Figure 5 As shown.

[0053] The second pressure sensor 23 measures the pressure value in real time. When the pressure value inside the GIS reaches the required level, the inflation function is turned off. During the inflation process, the cooling and heating device 9 continuously operates the heating function, and the SF6 is heated and vaporized in the heat exchanger 28. When the gas flows through the first filter 10, the moisture, SF6 decomposition products, and other impurities contained in the gas are adsorbed a second time by the adsorbent in the first filter 10 to ensure that the SF6 gas is purified in the end.

[0054] The specific embodiment 2 of the gas recovery and inflation device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, a first inflation branch and a second inflation branch are connected in parallel on the recovery branch to form an inflation branch. In this embodiment, the inflation branch and the recovery branch are connected in parallel, but there is no shared pipeline between them. In this case, only a cooling temperature control device needs to be installed on the recovery branch.

[0055] The specific embodiment 3 of the gas recovery and charging device provided by the present invention differs from embodiment 1 mainly in that: in embodiment 1, the refrigeration and heating device is located downstream of the first compressor. In this embodiment, the refrigeration and heating device is located upstream of the first compressor.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas recovery and charging device, comprising a gas storage device interface (1) and an equipment interface (2), wherein the gas storage device interface (1) is used to connect to a gas storage device, the equipment interface (2) is used to connect to a gas-using device, and a recovery branch (3) is provided between the gas storage device interface (1) and the equipment interface (2), characterized in that, Along the gas flow direction during gas recovery, a first compressor (5) and a first valve located upstream of the first compressor (5) are provided on the recovery branch (3). The gas recovery and charging device also includes a vacuum branch (12) located between the gas storage device interface (1) and the equipment interface (2). The vacuum branch (12) is connected in parallel to the recovery branch, and one end of the vacuum branch (12) is connected upstream of the first valve, and the other end is connected between the first compressor (5) and the first valve. A vacuum compressor (14) is provided on the vacuum branch (12), and an exhaust branch (16) located downstream of the vacuum compressor (14) is provided on the exhaust branch (16). A second valve is provided for controlling the opening and closing of the exhaust branch (16); a refrigeration and heating device (9) with integrated refrigeration and heating functions is provided on the recovery branch (3); the gas recovery and charging device also includes a first charging branch (18) and a second charging branch (19) connected in parallel with the recovery branch. The first charging branch is connected in parallel with the refrigeration and heating device. Along the gas flow direction when recovering gas, the end of the first charging branch located upstream of the refrigeration and heating device is defined as the first connection end, and the end located downstream of the refrigeration and heating device is defined as the second connection end. One end of the second charging branch is connected between the refrigeration and heating device and the second connection end, and the other end is connected between the first connection end and the equipment interface.

2. The gas recovery and inflation device according to claim 1, characterized in that, a definition is provided. The second gas charging branch (19) is located between the refrigeration and heating device (9) and the second connection end, and the third connection end is located at one end. The gas recovery and charging device also includes a filter disposed between the third connection end and the first connection end.

3. The gas recovery and inflation device according to claim 2, characterized in that, The filter is located between the third connection end and the refrigeration and heating device (9).

4. The gas recovery and inflation device according to any one of claims 1-3, characterized in that, Along the direction of gas flow during gas recovery, the refrigeration and heating device (9) is located downstream of the first compressor (5), and a pressure detection element for monitoring the pressure at the outlet of the first compressor (5) is provided at the outlet of the first compressor (5).

5. The gas recovery and inflation device according to claim 4, characterized in that, The pressure detection element includes a pressure gauge and a pressure sensor, and the gas recovery and inflation device also includes a control system. The pressure sensor is connected to the controller of the control system for signal transmission.

6. The gas recovery and inflation device according to claim 1, characterized in that, Along the gas flow direction during gas recovery, a temperature control device capable of cooling the gas is provided downstream of the first compressor (5) on the recovery branch, and a pressure detection element for monitoring the pressure at the outlet of the first compressor (5) is provided at the outlet of the first compressor (5).

7. The gas recovery and inflation device according to any one of claims 1-3, characterized in that, The second inflation branch (19) is equipped with a pressure detection element for detecting the pressure inside the gas-using equipment.

8. The gas recovery and inflation device according to claim 7, characterized in that, The pressure detection element includes a pressure sensor and a pressure gauge, and the gas recovery and inflation device also includes a control system. The pressure sensor is connected to the controller of the control system for signal transmission.

9. The gas recovery and inflation device according to any one of claims 1-3, characterized in that, The gas recovery and inflation device also includes a pressure detection element for detecting the pressure inside the gas-using equipment.

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