Internal oil type metal corrugated oil conservator with pointer type oil level indicator

Abstract

The utility model belongs to the technical field of metal corrugated oil conservators for transformers, and particularly relates to an internal oil type metal corrugated oil conservator with a pointer type oil level indicator, which comprises a conservator cover, a conservator seat, an expansion core, the pointer type oil level indicator and a transmission and detection component. The expansion core body expands and contracts up and down in the cabinet cover, the pointer type oil level gauge is installed on the cabinet cover, the up-and-down movement of the expansion core body is converted into rotation of an oil level gauge pointer through the transmission and detection assembly, oil level information is transmitted to a remote control terminal, and the functions of remotely monitoring the oil level height and giving an alarm when the oil level is too high or too low are achieved. The oil level indicating device is visual and accurate in oil level indication, convenient and fast in reading, smooth and reliable in transmission and detection assembly operation, free of clamping stagnation, high in universality, free of limitation of sealing performance, capable of achieving remote monitoring and capable of saving manpower and material resources.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal corrugated oil conservator for transformers, specifically an internal oil-type metal corrugated oil conservator with a pointer-type oil level gauge. Background Technology

[0002] The transformer uses an internal oil-type corrugated metal oil conservator. The insulating oil inside the transformer enters the expansion core, and expands and contracts within the stainless steel expansion core to accommodate changes in the volume of the insulating oil inside the transformer, thus achieving the purpose of oil storage.

[0003] Internal oil-insulated corrugated metal conservators define the oil level based on the height of the expansion core. The lowest and highest positions of the expansion core represent the lower and upper limits of the oil level. Changes in the expansion core's height need to be converted into changes in the oil level gauge readings via mechanical devices. Improper design can lead to inaccurate readings or even gauge malfunction. Furthermore, transformers are typically located far from urban areas, and oil conservators are usually installed at higher elevations; therefore, remote monitoring has become a requirement for most customers. Utility Model Content

[0004] The purpose of this invention is to provide an internally mounted corrugated metal oil tank with a pointer-type oil level gauge. This oil tank has a reliable structure, good manufacturability, and strong versatility; furthermore, it enables remote monitoring of oil level information.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model includes a pointer-type oil level gauge, a cabinet cover, an expansion core, and a cabinet base. The expansion core is mounted on the cabinet base, and the cabinet cover covers the outside of the expansion core. The pointer-type oil level gauge is mounted on the cabinet cover. Transformer insulating oil enters the interior of the expansion core through a connecting pipe provided on the cabinet base. A channel steel is fixedly connected to the top of the expansion core. The pointer-type oil level gauge is connected to the channel steel via a transmission and detection assembly. The transmission and detection assembly includes a telescopic rod and a detection component. One end of the telescopic rod is a ball joint, which is connected to a sleeve assembly in the pointer-type oil level gauge. The other end of the telescopic rod is hinged to the channel steel. A detection component for detecting the length of the telescopic rod is installed on the telescopic rod. The up-and-down movement of the expansion core is converted into changes in the dial reading of the pointer-type oil level gauge through the transmission and detection assembly.

[0007] Wherein: the telescopic rod includes a first hollow rod and a second hollow rod. One end of the first hollow rod is connected to one end of a ball joint. The other end of the ball joint is threaded and threadedly connected to the sleeve assembly. The other end of the first hollow rod is an open end. One end of the second hollow rod is hinged to a channel steel. The other end of the second hollow rod is inserted through the open end of the first hollow rod and rolls in contact with the inner wall of the first hollow rod.

[0008] A vent hole is provided on the first hollow rod near the ball joint, and a vent plug is installed on the vent hole.

[0009] One end of the second hollow rod is a welded perforated connecting plate, which is hinged to the channel steel by a pin. The other end of the second hollow rod is provided with a ball bearing, which makes rolling contact with the inner wall of the first hollow rod.

[0010] The detection assembly includes a ring magnet and a reed switch / Hall sensor strip. The ring magnet is sleeved on the outside of the other end of the first hollow rod, and the reed switch / Hall sensor strip is disposed inside the second hollow rod.

[0011] The other end of the telescopic rod is hinged to the channel steel via a pin. The axial direction of the pin is the width direction of the channel steel, and the two ends of the pin protrude from both sides of the channel steel along its length.

[0012] Multiple sets of through holes are opened on both sides of the channel steel along its length. The two through holes in each set are symmetrically opened with the center line of the channel steel along its length. The pin is inserted into the through holes at different positions to adjust the initial position of the transmission and detection components, thereby adapting to different models of oil tanks.

[0013] The other end of the telescopic rod is a perforated connecting plate. The pin passes through the opening on the perforated connecting plate. A return spring is sleeved on the pin on both sides of the perforated connecting plate. The two ends of the return spring on each side abut against the perforated connecting plate and the channel steel on the same side, respectively.

[0014] The dial and housing assembly of the pointer-type oil level gauge are connected to the cabinet cover at one end via a connecting flange. The sleeve assembly includes a sleeve and a transmission gear. The sleeve is hinged to the connecting flange. One end of the sleeve has a threaded hole for threaded connection of a ball joint. The other end of the sleeve is fixedly connected to the transmission gear, which meshes with the gear inside the dial and housing assembly.

[0015] The other end of the dial and housing assembly is a dial with non-uniformly distributed scales.

[0016] The advantages and positive effects of this utility model are as follows:

[0017] This utility model, by applying an oil level gauge with a pointer, makes reading the oil level information of the internal corrugated metal oil tank more convenient, faster, more accurate, and easier to process. Specifically:

[0018] 1. Convenient and accurate reading: This utility model adopts an oil level gauge with a pointer, which converts the change in the height of the expansion core into the change in the angle of the pointer through the transmission and detection components. The dial reading can be read directly, making the reading convenient and quick. At the same time, it avoids reading errors caused by the viewing angle, making the reading more accurate.

[0019] 2. High versatility and low cost: The top of the expansion core of this utility model is welded with channel steel, and multiple sets of holes are opened on both sides of the channel steel along the length direction. The initial position is adjustable. At the same time, the length of the telescopic rod can be adjusted to meet the situation of the oil tank being too large or too small, without being limited by the stroke. The electrical signal is output through the detection component. The simplest mechanical structure of the dial oil level gauge on the market can be used, which is convenient to purchase and can reduce costs. At the same time, the transformer oil is stored inside the core, and the cabinet is open to the atmosphere, so it is not affected by the sealing problem. The oil level gauge can be installed at any position in the cabinet.

[0020] 3. Reliable structure and sensitive and accurate transmission: The second hollow rod of this utility model adopts a ball bearing structure to move within the first hollow rod, changing sliding to rolling and reducing jamming. The first hollow rod has a vent hole to avoid resistance caused by compressed air when the second hollow rod moves within the first hollow rod. The first hollow rod is connected to the oil level gauge through a ball joint. The ball joint has multiple degrees of freedom, which can avoid jamming or even rod deformation caused by compression during the relative movement of the two hollow rods. When the perforated connecting plate on the second hollow rod cooperates with the channel steel, return springs are installed on both sides of the perforated connecting plate to prevent the rod from tilting due to instability during the movement of the expansion core, which would lead to inaccurate oil level information.

[0021] 4. Remote monitoring is possible: This utility model can use a detection component to detect the length of the telescopic rod and transmit the detection signal to a remote central control unit to obtain oil level information remotely. An alarm can be triggered if an abnormal situation occurs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the pointer-type oil level gauge and its transmission and detection components according to this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the channel steel and the transmission and detection components of this utility model;

[0025] Figure 4 This is a schematic diagram of the transmission and detection components of this utility model;

[0026] Figure 5 This is a schematic diagram of the sleeve assembly of this utility model;

[0027] Figure 6 This is a schematic diagram of the scale on the dial of the pointer-type oil level gauge of this utility model;

[0028] Figure 7 This is a schematic diagram of the structural principle of this utility model;

[0029] Wherein: 1 is a pointer-type oil level gauge, 2 is a cabinet cover, 3 is a channel steel, 4 is an expansion core, 5 is a connecting pipe, 6 is an oil injection pipe, 7 is an exhaust pipe, 8 is a cabinet base, 9 is a transmission and detection assembly, 10 is a connecting flange, 11 is a dial and housing assembly, 12 is a sleeve assembly, 13 is a pin, 14 is a return spring, 15 is the first hollow rod, 16 is the second hollow rod, 17 is a ball joint, 18 is a vent plug, 19 is a ball bearing, 20 is a perforated connecting plate, 21 is a ring magnet, 22 is a reed switch / Hall sensor strip, 23 is a sleeve, 24 is a transmission gear, 25 is a through hole, and 26 is a threaded hole. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] like Figure 1 As shown, this utility model includes a pointer-type oil level gauge 1, a cabinet cover 2, an expansion core 4, and a cabinet base 8. The expansion core 4 is mounted on the cabinet base 8, and the cabinet cover 2 covers the outside of the expansion core 4. The expansion core 4 moves up and down, expanding and contracting inside the cabinet cover 2. The pointer-type oil level gauge 1 is mounted on the cabinet cover 2 near its top. The bottom of the cabinet base 8 is connected to a connecting pipe 5 and an exhaust pipe 7. The connecting pipe 5 is used to connect to the transformer oil tank. Transformer insulating oil enters the interior of the expansion core 4 through the connecting pipe 5, causing the expansion core 4 to expand or contract, thus achieving the purpose of storing transformer oil inside the expansion core 4. The height change caused by expansion and contraction is the oil level information of the oil tank. The exhaust pipe 7 is connected to the interior of the cabinet cover 2 outside the expansion core 4. An oil injection pipe 6 is also connected to the connecting pipe 5. Because the transformer insulating oil is stored inside the expansion core 4, the sealing performance of the cabinet cover 2 is not a concern.

[0032] In this embodiment, the top of the expansion core 4 is welded with a channel steel 3. The pointer-type oil level gauge 1 is connected to the channel steel 3 through a transmission and detection component 9. The transmission and detection component 9 converts the oil level information changes caused by the expansion and contraction of the expansion core 4 into the rotation of the pointer of the pointer-type oil level gauge 1, thereby changing the dial reading and intuitively displaying the oil level information of the oil tank. The detection component in the transmission and detection component 9 can also convert the oil level information into an electrical signal and transmit it to the remote control terminal.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the transmission and detection component 9 in this embodiment includes a telescopic rod and a detection component. One end of the telescopic rod is a ball joint 17, which is connected to the sleeve assembly 12 in the pointer-type oil level gauge 1. The other end of the telescopic rod is hinged to the channel steel 3. The telescopic rod is equipped with a detection component for detecting the length of the telescopic rod.

[0034] The telescopic rod in this embodiment includes a first hollow rod 15 and a second hollow rod 16. One end of the first hollow rod 15 is connected to one end of a ball joint 17. The other end of the ball joint 17 is threaded and threadedly connected to the sleeve assembly 12. The other end of the first hollow rod 15 is an open end. One end of the second hollow rod 16 is a welded perforated connecting plate 20, which is hinged to the channel steel 3 via a pin 13. The other end of the second hollow rod 16 is provided with a ball bearing 19, which is inserted into the open end of the first hollow rod 15. The ball bearing 19 rolls in contact with the inner wall of the first hollow rod 15. A vent hole is provided on the first hollow rod 15 near the ball joint 17, and a vent plug 18 is installed on the vent hole. The ball joint 17 in this embodiment is prior art, in which a ball head is installed in a ball head seat, and the ball head can rotate in the ball head seat to achieve multiple degrees of freedom of movement.

[0035] The detection component in this embodiment includes a ring magnet 21 and a reed switch / Hall sensor strip 22. The ring magnet 21 is sleeved on the outside of the other end of the first hollow rod 15, and the reed switch / Hall sensor strip 22 is disposed inside the second hollow rod 16.

[0036] In this embodiment, the pin 13 passes through the opening on the perforated connecting plate 20. The axial direction of the pin 13 is along the width of the channel steel 3, and both ends of the pin 13 protrude from both sides of the channel steel 3 along its length. Multiple sets of through holes 25 are provided on both sides of the channel steel 3 along its length. The two through holes 25 in each set are symmetrically arranged around the center line of the channel steel 3 along its length. The pin 13 is inserted into the through holes 25 at different positions to adjust the initial position of the transmission and detection component 9, thereby adapting to different models of oil tanks and improving versatility. A return spring 14 is fitted on the pin 13 on both sides of the perforated connecting plate 20. The two ends of the return spring 14 on each side abut against the perforated connecting plate 20 and the channel steel 3 on the same side, respectively. During the contraction and expansion of the expansion core 4, the surface will tilt, causing the transmission and detection component 9 to tilt, which will interfere with the reading. Installing the return spring 14 can use the spring property to reset the transmission and detection component 9, making the reading more accurate.

[0037] like Figure 1 , Figure 2 and Figures 4-6As shown, the pointer-type oil level gauge 1 in this embodiment is the prior art, having a connecting assembly, internal gears, a dial, and a housing assembly 11. A flange is welded on the cabinet 2. The connecting assembly includes a connecting flange 10 and a sleeve assembly 12. One end of the dial and housing assembly 11 is connected to the flange on the cabinet 2 through the connecting flange 10, so that the pointer-type oil level gauge 1 is assembled on the cabinet 2. The other end of the dial and housing assembly 11 is a dial with non-uniformly distributed scales. The sleeve assembly 12 includes a sleeve 23 and a transmission gear 24. The sleeve 23 is hinged to the connecting flange 10. One end of the sleeve 23 has a threaded hole 26 for threaded connection of the other end of the ball joint 17. The other end of the sleeve 23 is U-shaped. The transmission gear 24 is fixedly connected inside the U-shaped opening. The transmission gear 24 meshes with the gear inside the dial and housing assembly 11. The transmission gear 24 rotates as the angle of the sleeve 23 changes, and then drives the pointer to rotate by meshing with the gear inside the housing assembly 11. Because the angle change of the first hollow rod at 15 degrees is non-linear, calculations were performed to set the dial scale to be non-equal divisions (i.e., Figure 6 The angles α1, α2, and α3 between adjacent graduations are not equal, which are used to display the oil level.

[0038] The working principle of this utility model is as follows:

[0039] As the expansion core 4 moves up and down, it drives the second hollow rod 16 to move relative to the first hollow rod 15. The second hollow rod 16 rolls on the inner wall of the first hollow rod 15 via ball bearings 19. This reduces friction caused by the relative motion, thus reducing jamming and changing the angle α of the first hollow rod 15. The first hollow rod 15 rotates via the sleeve assembly 12, and the rotation is converted into the rotation of the oil level gauge pointer by the gear system inside the dial and housing assembly 11. A vent hole is opened on the first hollow rod 15 and a vent plug 18 is installed to prevent the ball bearings 19 from compressing the air inside the first hollow rod 15 and causing damping. The smoothness of the movement is improved by using the vent plug 18 and the ball bearings 19. The second hollow rod 16 will squeeze the inner wall of the first hollow rod 15, which can easily cause jamming or even damage to the rod. Therefore, one end of the first hollow rod 15 is connected by a ball joint 17, which utilizes the multi-degree-of-freedom nature of the ball joint 17 to avoid jamming.

[0040] like Figure 7 As shown, the position of the oil level pointer, the height of the expansion core 4, and the length of the transmission and detection component 9 form a right trapezoid. The base L1 and the right-angled side L2 of the right trapezoid are fixed values. Therefore, the oil level height can be obtained by measuring the length of the rod of the transmission and detection component 9 (i.e., the hypotenuse of the trapezoid).

[0041] The function of the detection component is to monitor the oil level. When the oil level is too low or too high, an alarm is generated and the alarm signal is transmitted to the control terminal. At the same time, the oil level can be converted into current information and transmitted to the control terminal.

[0042] One implementation of the detection component includes a reed switch and a ring magnet 21. The ring magnet 21 is located on the outside of the other end of the first hollow rod 15, and the reed switch is located inside the second hollow rod 16. The reed switch is composed of multiple parallel resistors. When the outer and inner rods move relative to each other, the magnetic force causes the switches in different positions to close, thereby changing the resistance and affecting the transmission current to achieve length monitoring. The oil level height is then calculated and the electrical signal is transmitted.

[0043] Another implementation of the detection component includes a Hall sensor strip and a ring magnet 21. Similar to the previous solution, the outer side of the other end of the first hollow rod 15 is equipped with a ring magnet 21, and the Hall sensor strip is installed inside the second hollow rod 16. When moving relative to each other, the distance changes to change the magnetic field strength and thus affect the Hall voltage, thereby achieving length monitoring.

Claims

1. An internal oil-type corrugated metal oil tank with a pointer-type oil level gauge, comprising a pointer-type oil level gauge (1), a cabinet cover (2), an expansion core (4), and a cabinet base (8), wherein the expansion core (4) is mounted on the cabinet base (8), the cabinet cover (2) covers the outside of the expansion core (4), the pointer-type oil level gauge (1) is mounted on the cabinet cover (2), and transformer insulating oil enters the interior of the expansion core (4) through a connecting pipe (5) provided on the cabinet base (8); characterized in that: The expansion core (4) is fixed to the top of a channel steel (3). The pointer oil level gauge (1) is connected to the channel steel (3) through a transmission and detection assembly (9). The transmission and detection assembly (9) includes a telescopic rod and a detection assembly. One end of the telescopic rod is a ball joint (17). The ball joint (17) is connected to the sleeve assembly (12) in the pointer oil level gauge (1). The other end of the telescopic rod is hinged to the channel steel (3). The telescopic rod is equipped with a detection assembly for detecting the length of the telescopic rod. The up and down movement of the expansion core (4) is converted into a change in the dial reading of the pointer oil level gauge (1) through the transmission and detection assembly (9).

2. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 1, characterized in that: The telescopic rod includes a first hollow rod (15) and a second hollow rod (16). One end of the first hollow rod (15) is connected to one end of a ball joint (17). The other end of the ball joint (17) is threaded and threadedly connected to the sleeve assembly (12). The other end of the first hollow rod (15) is an open end. One end of the second hollow rod (16) is hinged to a channel steel (3). The other end of the second hollow rod (16) is inserted through the open end of the first hollow rod (15) and rolls in contact with the inner wall of the first hollow rod (15).

3. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 2, characterized in that: The first hollow rod (15) has a vent hole near the ball joint (17), and a vent plug (18) is installed on the vent hole.

4. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 2, characterized in that: One end of the second hollow rod (16) is a welded perforated connecting plate (20), which is hinged to the channel steel (3) by a pin (13). The other end of the second hollow rod (16) is provided with a ball (19), which rolls in contact with the inner wall of the first hollow rod (15).

5. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 2, characterized in that: The detection assembly includes a ring magnet (21) and a reed switch / Hall sensor strip (22). The ring magnet (21) is sleeved on the outside of the other end of the first hollow rod (15), and the reed switch / Hall sensor strip (22) is disposed inside the second hollow rod (16).

6. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 1, characterized in that: The other end of the telescopic rod is hinged to the channel steel (3) via a pin (13). The axial direction of the pin (13) is the width direction of the channel steel (3), and the two ends of the pin (13) pass through the two sides of the channel steel (3) along its length.

7. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 6, characterized in that: Multiple sets of through holes (25) are opened on both sides of the channel steel (3) along its length. The two through holes (25) in each set are symmetrically opened with the center line of the channel steel (3) along its length. The pin (13) is inserted into the through holes (25) at different positions to adjust the initial position of the transmission and detection components (9), thereby adapting to different models of oil tanks.

8. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 6, characterized in that: The other end of the telescopic rod is a perforated connecting plate (20). The pin (13) passes through the opening on the perforated connecting plate (20). A return spring (14) is sleeved on the pin (13) on both sides of the perforated connecting plate (20). The two ends of the return spring (14) on each side abut against the perforated connecting plate (20) and the channel steel (3) on the same side, respectively.

9. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 1, characterized in that: One end of the dial and housing assembly (11) of the pointer-type oil level gauge (1) is connected to the cabinet (2) via a connecting flange (10). The sleeve assembly (12) includes a sleeve (23) and a transmission gear (24). The sleeve (23) is hinged to the connecting flange (10). One end of the sleeve (23) is provided with a threaded hole (26) for threaded connection of a ball joint (17). The other end of the sleeve (23) is fixedly connected to the transmission gear (24). The transmission gear (24) meshes with the gear inside the dial and housing assembly (11).

10. The internal oil-type corrugated metal oil tank with pointer-type oil level gauge according to claim 9, characterized in that: The other end of the dial and housing assembly (11) is a dial with non-uniformly distributed scales.

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