Gas density relay

Abstract

This utility model provides a gas density relay, including a relay body, a multi-port interface, an on / off valve, a self-sealing interface, and a device under test (DUT) interface. The multi-port interface includes a first port, a second port, and a third port. The relay body interface is connected to and communicates with the first port. One end of the self-sealing interface is connected to and communicates with the second port, and the other end is used to connect to a gas filling device or a calibration device. One end of the on / off valve is connected to and communicates with the third port, and the other end of the on / off valve is connected to and communicates with one end of the DUT interface. The on / off valve is used to disconnect or connect the gas path between the third port and the DUT interface. The other end of the DUT interface is used to connect to the electrical device under test. By controlling the opening or closing of the self-sealing interface and the on / off valve, the self-sealing interface is connected to the gas filling device or the calibration device, thereby realizing the gas density relay's non-disassembly calibration and filling function, improving operation and maintenance efficiency, reducing the risk of gas leakage, and enhancing safety.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, and specifically relates to a gas density relay. Background Technology

[0002] Currently, in power systems, gas density relays (taking sulfur hexafluoride (SF6) density relays as an example) are used to monitor the gas density inside power equipment, thus detecting potential gas leaks. Their measurement accuracy is crucial to the operational safety of the entire equipment; therefore, gas density relays require regular calibration. Traditional calibration methods involve disassembling the gas density relay. This disassembly and reassembly process is time-consuming, impacting equipment operating efficiency. Furthermore, frequent disassembly can lead to wear on seals, causing gas leaks and posing safety hazards. Utility Model Content

[0003] The purpose of this invention is to solve the problems in the prior art where the gas density relay needs to be disassembled for verification. The disassembly and reassembly process is time-consuming, affecting the operating efficiency of the equipment. In addition, frequent disassembly can easily lead to wear of the seals, causing gas leakage and posing a safety hazard.

[0004] To address the aforementioned technical problems, this utility model discloses a gas density relay, comprising a relay body, a multi-port interface, an on / off valve, a self-sealing interface, and a device under test (DUT) interface. The multi-port interface includes a first port, a second port, and a third port. The relay body interface is connected to and communicates with the first port. One end of the self-sealing interface is connected to and communicates with the second port, and the other end is used to connect to a gas filling device or a calibration device. One end of the on / off valve is connected to and communicates with the third port, and the other end of the on / off valve is connected to and communicates with one end of the DUT interface. The on / off valve is used to disconnect or connect the gas path between the third port and the DUT interface. The other end of the DUT interface is used to connect to the electrical equipment under test.

[0005] The above technical solution involves setting up multiple interfaces to connect the relay body, the self-sealing interface, and the interface of the device under test (DUT). An on / off valve is installed between the multiple interfaces and the DUT interface to disconnect or connect the gas path between the third port of the multiple interfaces and the DUT interface. Under normal operation, the self-sealing interface is closed and the on / off valve is opened, connecting the relay body to the DUT's gas path and monitoring its operating status in real time. When the relay body detects a pressure drop inside the DUT, it needs to be replenished with gas (i.e., in a charging state). The self-sealing interface and the on / off valve are opened, connecting the charging device to the DUT's gas path for charging. Under calibration conditions, the self-sealing interface is opened and the on / off valve is closed, connecting the relay body to the calibration device for calibration. By controlling the opening and closing of the self-sealing interface and the on / off valve, the gas density relay achieves non-disassembly calibration and charging functions, improving maintenance efficiency, reducing the risk of gas leakage, and enhancing safety.

[0006] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment has a manually operated on / off valve.

[0007] Using the above technical solution, the manual on / off valve has a simple structure and low cost.

[0008] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment includes a valve body, a valve core, and a handle; the valve body has a hollow channel, one end of which is connected to a third port, and the other end of which is connected to one end of the interface of the device under test; the valve core has a vent hole located in the channel, and the handle is rotatably connected to the outside of the valve body and fixedly connected to the valve core. Rotating the handle drives the valve core to rotate, so that the vent hole is disconnected from or connected to the channel, thereby disconnecting or connecting the gas path between the third port and the interface of the device under test.

[0009] Using the above technical solution, the on / off operation of the valve can be achieved by turning the handle, making the operation simple and intuitive.

[0010] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment of the present invention further includes a sealing element, which is fixed between the outer wall of the valve core and the inner wall of the channel.

[0011] By adopting the above technical solution, a seal can be provided between the outer wall of the valve core and the inner wall of the channel to prevent gas from leaking between the outer wall of the valve core and the inner wall of the channel.

[0012] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment of the present invention further includes a status indicator panel, which is fixed on the outside of the valve body and is provided with a gas filling status indicator and a calibration status indicator.

[0013] By adopting the above technical solution, by setting a status indicator panel with inflation status and calibration status indicators on the outside of the valve body, the rotation position of the control handle can be controlled more intuitively according to the calibration and inflation functions.

[0014] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment of the present invention further includes a buckle, one end of which is sleeved on the handle and the other end is snapped onto the status indicator panel.

[0015] By adopting the above technical solution and setting a buckle, the handle can be locked to prevent gas leakage caused by the handle shaking due to vibration of electrical equipment during long-term operation.

[0016] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment of the present invention has a first latching part and a second latching part on the status indicator panel. The first latching part is set to correspond with the inflation status indicator, and the second latching part is set to correspond with the calibration status indicator. The other end of the buckle is latched to the first latching part or the second latching part.

[0017] By adopting the above technical solution, and by setting the first locking part and the second locking part, the handle rotation can be locked in the inflation state or the calibration state, thus avoiding the problem of gas leakage caused by the handle shaking due to vibration.

[0018] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment further includes a temperature and pressure sensor, which is fixed inside the on / off valve on the side near the interface of the device under test, and is used to acquire the pressure and temperature inside the electrical equipment under test connected to the interface of the device under test in real time.

[0019] By adopting the above technical solution, the temperature and pressure sensor is fixed inside the on / off valve on the side close to the interface of the device under test. In the calibration state, even if the on / off valve is closed, the pressure and temperature inside the electrical equipment under test can still be obtained in real time, so that emergency measures can be taken in case of abnormality, thereby improving the safety in the calibration state.

[0020] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment has a three-way interface.

[0021] Using the above technical solution, the multi-channel interface is a three-way interface, which has a simple structure and low cost.

[0022] According to another specific embodiment of the present invention, the gas density relay disclosed in this embodiment further includes: a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline; the interface of the relay body is connected to the first port through the first pipeline, the self-sealing interface is connected to the second port through the second pipeline, one end of the on / off valve is connected to the third port through the third pipeline, and the other end of the on / off valve is connected to the interface of the device under test through the fourth pipeline.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention provides a gas density relay. It features a multi-port interface connecting the relay body, a self-sealing interface, and the interface of the device under test (DUT). A shut-off valve is located between the multi-port interface and the DUT interface to disconnect or connect the gas path between the third port of the multi-port interface and the DUT interface. In normal operation, the self-sealing interface is closed and the shut-off valve is opened, connecting the relay body to the DUT's gas path for real-time monitoring of the DUT's operating status. In inflation mode, the self-sealing interface and the shut-off valve are opened, connecting the inflation device to the DUT's gas path for inflation. In calibration mode, the self-sealing interface is opened and the shut-off valve is closed, connecting the relay body to the calibration device for calibration. By controlling the opening and closing of the self-sealing interface and the shut-off valve, the gas density relay achieves disassembly-free calibration and inflation, improving maintenance efficiency, reducing the risk of gas leakage, and enhancing safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a gas density relay provided in an embodiment of the present invention;

[0026] Figure 2 A structural block diagram of a gas density relay in normal operating condition provided in this embodiment of the utility model (wherein the relay body is connected to the electrical equipment under test);

[0027] Figure 3 A structural block diagram of a gas density relay in a gas-filled state provided in this embodiment of the utility model (wherein the gas-filling device is connected to the electrical device under test);

[0028] Figure 4 A structural block diagram of a gas density relay in a calibration state provided for an embodiment of this utility model (wherein the relay body is connected to the calibration device);

[0029] Figure 5 A schematic diagram of the on / off valve of the gas density relay provided in this embodiment of the utility model;

[0030] Figure 6 This is a cross-sectional view of the on / off valve of the gas density relay provided in an embodiment of the present invention.

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

[0032] 100. Relay body; 200. Multi-port interface; 300. On / off valve; 310. Valve body; 311. Channel; 320. Valve core; 330. Handle; 340. Status indicator panel; 341. First snap-fit ​​part; 350. Snap-fit; 400. Self-sealing interface; 500. Device under test interface; 600. Inflation device; 700. Calibration device; 800. Electrical device under test; 900. Temperature and pressure sensor; 10. First pipeline; 20. Second pipeline; 30. Third pipeline; 40. Fourth pipeline. Detailed Implementation

[0033] Currently, in power systems, gas density relays (taking sulfur hexafluoride (SF6) density relays as an example) are used to monitor the gas density inside power equipment, thus detecting potential gas leaks. Their measurement accuracy is crucial to the operational safety of the entire equipment; therefore, gas density relays require regular calibration. Traditional calibration methods involve disassembling the gas density relay. This disassembly and reassembly process is time-consuming, impacting equipment operating efficiency. Furthermore, frequent disassembly can lead to wear on seals, causing gas leaks and posing safety hazards.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0035] This utility model provides a gas density relay, such as Figures 1-4 As shown, the gas density relay includes a relay body 100, a multi-port interface 200, an on / off valve 300, a self-sealing interface 400, and a device under test interface 500. The multi-port interface 200 includes a first port, a second port, and a third port; the interface of the relay body 100 is connected to and communicates with the first port; one end of the self-sealing interface 400 is connected to and communicates with the second port, and the other end is used to connect to a gas filling device 600 or a calibration device 700; one end of the on / off valve 300 is connected to and communicates with the third port, and the other end of the on / off valve 300 is connected to and communicates with one end of the device under test interface 500, the on / off valve 300 being used to disconnect or connect the gas path between the third port and the device under test interface 500; the other end of the device under test interface 500 is used to connect to the electrical device under test 800.

[0036] It should be noted that the gas density relay in this embodiment can specifically be a sulfur hexafluoride (SF6) density relay. The self-sealing interface 400 is a universal connector for calibration and inflation. Under normal operation, it is in a self-sealing state, which, together with the protective cover, can ensure the sealing of the entire relay. During inflation, it is in the open state and connected to the inflation device 600. During calibration, it is in the open state and connected to the calibration device 700.

[0037] Specifically, such as Figures 1-4 As shown, a multi-port interface 200 is configured to connect and link the relay body 100, a self-sealing interface 400 for connecting the inflation device 600 or the calibration device 700, and a device under test (DUT) interface 500 for connecting the electrical device under test 800. An on / off valve 300 is installed between the multi-port interface 200 and the DUT interface 500 to disconnect or connect the gas path between the third port of the multi-port interface 200 and the DUT interface 500. By controlling the opening and closing of the self-sealing interface 400 and the on / off valve 300, the self-sealing interface 400 is connected to the inflation device 600 or the calibration device 700, enabling non-disassembly calibration and inflation of the gas density relay. This improves maintenance efficiency, reduces the risk of gas leakage, and enhances safety. Furthermore, a single self-sealing interface 400 is used for both inflation and calibration, reducing materials and saving costs.

[0038] More specifically, under normal circumstances, the gas density relay is in the following state: Figure 2 The normal operating state shown is as follows: the self-sealing interface 400 is closed, the on / off valve 300 is opened, and the relay body 100 is connected to the gas circuit of the electrical device under test 800 to monitor the operating status of the electrical device under test 800 in real time. It should be noted that the monitored operating status of the electrical device under test 800 includes the internal pressure status. When the relay body 100 detects a decrease in the internal pressure of the electrical device under test 800, it can set the gas density relay to a position as shown in the diagram. Figure 3 The inflation state is shown below, where the self-sealing interface 400 is connected to the inflation device 600 (e.g., an external gas cylinder for gas storage), the self-sealing interface 400 and the on / off valve 300 are opened, the inflation device 600 is connected to the gas circuit of the electrical device under test 800, and the inflation operation is performed on the electrical device under test 800. When it is necessary to calibrate the gas density relay, the gas density relay is set to the state shown below. Figure 4 The verification state shown indicates that even if the self-sealing interface 400 is connected to the verification device 700, opening the self-sealing interface 400 and closing the on / off valve 300 connects the relay body 100 to the verification device 700 for verification. Simultaneously, because the on / off valve 300 is closed, the internal pressure of the power equipment under test 800 is prevented from interfering with the accuracy of the relay body 100. It should be noted that... Figures 2-4 The solid lines in the diagram represent gas pipelines (or gas lines for short), while the dashed lines represent actual gas circuits.

[0039] It should be noted that the multi-channel interface 200 can be used for, for example Figure 1 The three-way interface shown can also be other multi-way interfaces with more than three interfaces. This implementation does not impose specific restrictions on this.

[0040] In one embodiment of this utility model, the on / off valve 300 is a manual on / off valve, which has a simple structure and low cost.

[0041] In one embodiment of this utility model, such as Figure 5 As shown, the on / off valve 300 includes a valve body 310, a valve core 320, and a handle 330; the valve body 310 has a hollow channel 311, one end of which is connected to the third port of the multi-port interface 200, and the other end of which is connected to one end of the interface 500 of the device under test; the valve core 320 has a vent hole ( Figure 5 (Not shown in the diagram), and located in channel 311, handle 330 is rotatably connected to the outside of valve body 310 and fixedly connected to valve core 320. Rotating handle 330 drives valve core 320 to rotate, so that the vent is disconnected from or connected to channel 311, so as to disconnect or connect the air path between the third port of multi-port interface 200 and the interface 500 of device under test.

[0042] It should be noted that disconnecting the on / off valve 300 means rotating the handle 330 to rotate the valve core 320 until the vent hole and channel 311 are disconnected. At this time, the air passage between the third port of the multi-port interface 200 and the interface 500 of the device under test is disconnected. Opening the on / off valve 300 means rotating the handle 330 to rotate the valve core 320 until the vent hole and channel 311 are connected. At this time, the air passage between the third port of the multi-port interface 200 and the interface 500 of the device under test is connected.

[0043] In one embodiment of the present invention, the on / off valve 300 further includes a sealing element (not shown in the figure), which is fixed between the outer wall of the valve core 320 and the inner wall of the channel 311, and can prevent gas from leaking between the outer wall of the valve core 320 and the inner wall of the channel 311.

[0044] In one embodiment of this utility model, such as Figure 5 and Figure 6 As shown, the on / off valve 300 also includes a status indicator panel 340, which is fixed to the outside of the valve body 310. The status indicator panel 340 is provided with status indicators such as "inflation" and "verification".

[0045] It should be noted that when the self-sealing interface 400 is open, if the handle 330 is rotated to the "Inflation" status indicator, i.e., the on / off valve 300 is open, the gas density relay is in the inflation state; if the handle 330 is rotated to the "Verification" status indicator, i.e., the on / off valve 300 is closed, the gas density relay is in the verification state. By setting a status indicator panel 340 with "Inflation" and "Verification" status indicators, the rotation position of the handle 330 can be controlled more intuitively according to the verification and inflation functions, preventing accidental operation. When the self-sealing interface 400 is closed, rotating the handle 330 to the "Inflation" status indicator, i.e., opening the on / off valve 300, puts the gas density relay in normal operating condition.

[0046] In one embodiment of this utility model, such as Figure 5 , Figure 6 As shown, the on / off valve 300 also includes a snap-fit ​​350, one end of which is sleeved on the handle 330 and the other end is snapped onto the status indicator panel 340.

[0047] By adopting the above technical solution, the handle 330 can be locked by setting the buckle 350, so as to avoid gas leakage caused by the vibration of the handle 330 due to vibration of the power equipment during long-term operation.

[0048] In one embodiment of this utility model, such as Figure 5 and Figure 6 As shown, the status indicator panel 340 is provided with a first latching part 341 and a second latching part (not shown in the figure). The first latching part 341 is set to correspond to the inflation status indicator, and the second latching part is set to correspond to the calibration status indicator. The other end of the buckle 350 is latched to the first latching part 341 or the second latching part.

[0049] It should be noted that in order to rotate the handle 330, the clip 350 attached to the handle 330 must first be removed. After the handle 330 is rotated to point to the "inflation" or "verification" status indicator, one end of the clip 350 can be reattached to the handle 330, and the other end of the clip 350 can be engaged with the first engaged part 341 (corresponding to the inflation status indicator) or the second engaged part (corresponding to the verification status indicator) of the status indicator disk 340. The handle 330 cannot be rotated, which can lock the handle 330 in the inflation or verification state and avoid the problem of gas leakage caused by the handle 330 shaking due to vibration.

[0050] In the calibration state, when the on / off valve 300 is closed, the air circuit between the relay body 100 and the electrical device under test 800 is disconnected. At this time, it is impossible to monitor the internal state of the electrical device under test 800. To solve the above technical problem, in one embodiment of this utility model, such as... Figure 6 As shown, the gas density relay also includes a temperature and pressure sensor 900. The temperature and pressure sensor 900 is fixed inside the on / off valve 300, near the interface 500 of the device under test, and is used to acquire the pressure and temperature inside the electrical equipment 800 connected to the interface 500 in real time. In this way, even if the on / off valve 300 is closed during the verification process, the pressure and temperature inside the electrical equipment 800 can still be acquired in real time, allowing for emergency measures to be taken in case of abnormalities, thus improving safety during the verification process. In one embodiment of this utility model, as... Figure 6 As shown, the temperature and pressure sensor 900 is fixed in the channel 311 of the valve body 310 in the on / off valve 300, and is located on the side of the valve core 320 near the interface 500 of the device under test.

[0051] In one embodiment of this utility model, such as Figure 1 As shown, the gas density relay also includes: a first pipeline 10, a second pipeline 20, a third pipeline 30, and a fourth pipeline 40; the interface of the relay body 100 is connected to the first port of the multi-port interface 200 through the first pipeline 10, the self-sealing interface 400 is connected to the second port of the multi-port interface 200 through the second pipeline 20, one end of the on / off valve 300 is connected to the third port of the multi-port interface 200 through the third pipeline 30, and the other end of the on / off valve 300 is connected to the interface 500 of the device under test through the fourth pipeline 40.

[0052] In one embodiment of this utility model, such as Figure 1 As shown, the multi-channel interface 200 is a three-way interface, which has a simple structure and low cost.

[0053] The gas density relay provided by this utility model is configured with a multi-port interface 200 that connects and links the relay body 100, the self-sealing interface 400, and the interface of the device under test 500. A shut-off valve 300 is provided between the multi-port interface 200 and the interface of the device under test 500 to disconnect or connect the gas path between the third port of the multi-port interface 200 and the interface of the device under test 500. By controlling the opening or closing of the self-sealing interface 400 and the shut-off valve 300, the self-sealing interface 400 is connected to the inflation device 600 or the calibration device 700, respectively, so that the gas density relay is in normal working state, inflation state, or calibration state. This realizes the functions of monitoring, non-disassembly calibration, and inflation of the gas density relay, improves operation and maintenance efficiency, reduces the risk of gas leakage, and enhances safety.

[0054] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0055] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0056] In the description of this embodiment, it should be noted that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0057] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0058] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A gas density relay, characterized in that, This includes the relay body, multi-port interface, on / off valve, self-sealing interface, and interface for the device under test; The multi-port interface includes: a first port, a second port, and a third port; The interface of the relay body is connected to and communicates with the first port; One end of the self-sealing interface is connected to and communicates with the second port, and the other end is used to connect to an inflation device or a calibration device. One end of the on / off valve is connected to and communicates with the third port, and the other end of the on / off valve is connected to and communicates with one end of the interface of the device under test. The on / off valve is used to disconnect or connect the gas path between the third port and the interface of the device under test; the other end of the interface of the device under test is used to connect the electrical equipment under test.

2. The gas density relay as described in claim 1, characterized in that, The on / off valve is a manually operated on / off valve.

3. The gas density relay as described in claim 2, characterized in that, The on / off valve includes a valve body, a valve core, and a handle; The valve body has a hollow channel, one end of which is connected to the third port, and the other end of which is connected to one end of the interface of the device under test. The valve core has a vent hole located in the channel. The handle is rotatably connected to the outside of the valve body and fixedly connected to the valve core. Rotating the handle causes the valve core to rotate, thereby disconnecting or connecting the vent hole with the channel, thus disconnecting or connecting the air path between the third port and the interface of the device under test.

4. The gas density relay as described in claim 3, characterized in that, The on / off valve also includes a sealing element, which is fixed between the outer wall of the valve core and the inner wall of the channel.

5. The gas density relay as described in claim 3, characterized in that, The on / off valve also includes a status indicator panel, which is fixed to the outside of the valve body. The status indicator panel is provided with an inflation status indicator and a calibration status indicator.

6. The gas density relay as described in claim 5, characterized in that, The on / off valve also includes a latch, one end of which is sleeved on the handle and the other end is latched onto the status indicator panel.

7. The gas density relay as described in claim 6, characterized in that, The status indicator panel is provided with a first latching part and a second latching part. The first latching part is set to correspond to the inflation status indicator, and the second latching part is set to correspond to the verification status indicator. The other end of the buckle is latched to the first latching part or the second latching part.

8. The gas density relay as described in any one of claims 1-7, characterized in that, The gas density relay also includes a temperature and pressure sensor, which is fixed inside the on / off valve on the side near the interface of the device under test, and is used to acquire the pressure and temperature inside the electrical equipment under test connected to the interface of the device under test in real time.

9. The gas density relay according to any one of claims 1-7, characterized in that, The multi-channel interface is a three-way interface.

10. The gas density relay according to any one of claims 1-7, characterized in that, The gas density relay further includes: a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline; the interface of the relay body is connected to the first port through the first pipeline, the self-sealing interface is connected to the second port through the second pipeline, one end of the on / off valve is connected to the third port through the third pipeline, and the other end of the on / off valve is connected to the interface of the device under test through the fourth pipeline.

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