Thermal expansion detection device

Abstract

The utility model relates to the technical field of transformer temperature controllers, in particular to a thermal expansion detection device, which comprises a thermostatic bath, a main frame body, and a plurality of groups of dial indicators, detection push rods and lockers which are arranged in a matching manner, the thermostatic bath is used for heating the temperature bulb probe body of the temperature bulb probe system immersed in the thermostatic bath. According to the utility model, through the thermostatic bath as well as the locking device, the dial indicator and the detection push rod which are arranged in a matched manner, direct and precise detection of the bulging amount of the elastic element can be realized, the detection precision can reach 0.01 mm, the measurement accuracy is effectively improved, and the phenomenon of batch reworking in production circulation is avoided; the elastic elements of a plurality of thermal bulb probe systems can be detected at the same time by arranging a plurality of sets of locking devices, dial indicators and detection push rods, use is convenient, the total detection time can be effectively shortened under the condition that batch detection can be conducted, and the device is simple in overall structure, easy to disassemble and assemble and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer temperature controllers, and particularly relates to a thermal expansion detection device. Background Art

[0002] With the development of oil-immersed transformers in China, temperature controllers for monitoring transformer temperatures have become increasingly mature. The existing domestic and foreign transformer temperature controllers on the market mainly use expansion type temperature controllers. The main core component of this temperature controller is a temperature bulb probe system composed of a temperature bulb probe body and a connecting cylinder body with elastic elements inside. When the liquid in the temperature bulb probe is heated and expands, it is conducted to the connecting cylinder body, and the elastic element inside the connecting cylinder body generates displacement. The elastic element mechanically pushes the pointer of the meter head to rotate through structures such as a push rod to indicate the temperature.

[0003] Among them, the thermal expansion accuracy of the elastic element itself directly affects the final measurement accuracy of the temperature controller. During production, it is necessary to measure whether the bulging amount of the elastic element reaches the qualified standard. At present, the judgment of the bulging amount of the elastic element in the same industry still stays at a simple measurement with a ruler and an empirical judgment on whether the produced elastic element is qualified. The measurement result is relatively rough and has poor accuracy, and it is easy to have the phenomenon of batch rework during production flow, which will have an adverse impact on the production process control and the product delivery cycle. Moreover, the measurement operation generally also requires holding a ruler and an elastic element at the same time, which is also inconvenient. Content of the Utility Model

[0004] Aiming at the problems of inconvenient detection and poor accuracy of the bulging amount of the elastic element in the temperature bulb probe system at present, the purpose of the utility model is to provide a thermal expansion detection device.

[0005] The purpose of the utility model is realized by the following technical solutions:

[0006] A thermal expansion detection device includes a constant temperature bath, a main frame body, and several groups of cooperatively arranged dial indicators, detection push rods, and locking devices. The main frame body is located outside the constant temperature bath, and the constant temperature bath is used to heat the temperature bulb probe body of the temperature bulb probe system immersed in the constant temperature bath.

[0007] A locking device mounting plate is provided on the main frame body. Each group of the locking devices is respectively arranged on the locking device mounting plate. Each group of the locking devices is respectively used to lock and fix the connecting cylinder body of a temperature bulb probe system. The outer shells of each group of the dial indicators are respectively fixed on the main frame body. The detection ends of each group of the dial indicators are respectively connected to one end of the detection push rod of the same group. The other ends of each group of the detection push rods are respectively used to abut against the inner bottom surface of the elastic element in the connecting cylinder body locked and fixed by the locking device of the same group.

[0008] The locking device mounting plate is located above the constant temperature bath.

[0009] The dial indicators of each group are all located above the locking device mounting plate.

[0010] The axial centerlines of the detection ends of the dial indicators of each group and the axial centerlines of the detection push rods of each group are all perpendicular to the horizontal plane.

[0011] The detection ends of the dial indicators of each group are respectively connected to one end of the detection push rod of the same group through threads.

[0012] A plurality of coil pipe racks are provided on the main frame body. Each coil pipe rack is respectively arranged below the locking device mounting plate. Each coil pipe rack is respectively used in cooperation with a group of dial indicators, detection push rods and locking devices.

[0013] The locking devices of all groups are arranged in sequence in the same straight line direction.

[0014] Each group of locking devices includes a basic frame and locking screws. The basic frames of each group of locking devices are fixed on the locking device mounting plate. A plurality of locking screws are provided on the basic frames of each group of locking devices. Connecting cylinder through holes are respectively opened on the locking device mounting plate at positions corresponding to the inner spaces of the basic frames of each group of locking devices. By rotating the locking screws of each group of locking devices, they simultaneously abut against the outer peripheral surface of the corresponding connecting cylinder and realize the locking and fixing of the connecting cylinder.

[0015] The axial centerlines of all the locking screws are parallel to the horizontal plane.

[0016] A plurality of mounting feet are provided on the outer peripheral surfaces of the basic frames of each group of locking devices. Each mounting foot is respectively fixedly connected to the locking device mounting plate through screws.

[0017] The advantages and positive effects of the present utility model are as follows:

[0018] Through the constant temperature bath and the cooperatively arranged locking devices, dial indicators and detection push rods, the present utility model can directly and precisely detect the bulging amount of the elastic element. The detection accuracy can reach 0.01 mm, effectively improving the measurement accuracy and avoiding the phenomenon of batch rework in the production process. And by setting multiple groups of locking devices, dial indicators and detection push rods, the elastic elements of multiple temperature bulb probe systems can be detected simultaneously, which is convenient to use. Under the condition of being able to detect in batches, the overall detection time can be effectively reduced. The overall structure of the device is simple, easy to disassemble and assemble, and the manufacturing cost is low. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the temperature bulb probe system of the existing transformer temperature controller applicable to the present utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the connecting cylinder of the existing temperature bulb probe system;

[0021] Figure 3 It is a schematic diagram of the main structure of the present invention except for the constant temperature bath;

[0022] Figure 4 It is a schematic diagram of the use state of the constant temperature bath of the present invention, one set of dial indicators, the detection push rod and the lock;

[0023] Figure 5 It is a schematic diagram of the structure of the lock of the present invention.

[0024] In the figure: 1 is the constant temperature bath, 2 is the main frame, 3 is the dial indicator, 4 is the detection push rod, 5 is the lock, 501 is the basic frame, 502 is the locking screw, 503 is the mounting foot, 6 is the lock mounting plate, 7 is the coil pipe rack;

[0025] 001 is the temperature bulb probe system, 0011 is the temperature bulb probe body, 0012 is the connecting cylinder, 0013 is the elastic element, 0014 is the oil pipe of the temperature bulb probe system. Specific embodiments

[0026] The following will further describe the present invention in conjunction with the attached Figures 1-5 For further details.

[0027] The existing temperature bulb probe system 001 of the transformer temperature controller applicable to the present invention, such as Figure 1 and Figure 2As shown in the figure, it includes a temperature bulb probe body 0011, a connecting cylinder 0012, an elastic element 0013, and a temperature bulb probe system oil pipe 0014. The temperature bulb probe body 0011 is a tubular part with a space A for containing heat-conducting oil inside. An oil filling port and an oil outlet that are respectively communicated with the space A are provided on the temperature bulb probe body 0011. The elastic element 0013 is installed inside the connecting cylinder 0012. The elastic element 0013 is used to mechanically push the pointer of the transformer temperature controller to rotate through structures such as a push rod to indicate the temperature. The setting structure of the elastic element 0013 and the connecting cylinder 0012 is prior art. The elastic element 0013 is generally a part with a bellows-shaped outer periphery that is open at one end and closed at the other end. A space B for containing heat-conducting oil is formed between the elastic element 0013 and the connecting cylinder 0012. An oil inlet and an oil outlet that are respectively communicated with the space B are provided on the connecting cylinder 0012. The oil inlet of the connecting cylinder 0012 is communicated with the oil outlet of the temperature bulb probe body 0011 through the temperature bulb probe system oil pipe 0014. The temperature bulb probe system oil pipe 0014 generally uses a copper pipe or a capillary tube of prior art. The whole composed of the probe body 0011, the connecting cylinder 0012, the elastic element 0013, and the temperature bulb probe system oil pipe 0014 is filled with heat-conducting oil, so that the space A, the space B, and the temperature bulb probe system oil pipe 0014 are filled with heat-conducting oil. Then, the oil filling port of the temperature bulb probe body 0011 and the oil outlet of the connecting cylinder 0012 are welded and sealed, thus forming the whole temperature bulb probe system 001.

[0028] The thermal expansion detection device proposed by the present utility model, as Figures 3-5 shown in the figure. In this embodiment, it includes a constant temperature bath 1, a main frame body 2, and five groups of cooperatively arranged dial indicators 3, detection push rods 4, and lockers 5. The main frame body 2 is located outside the constant temperature bath 1. The constant temperature bath 1 is used for oil bath heating of the temperature bulb probe body 0011 of the temperature bulb probe system 001 immersed in the constant temperature bath 1. In this embodiment, the constant temperature bath 1 uses a commercially available constant temperature oil bath product, and the dial indicators 3 are also all commercially available products; the main frame body 2 uses a stainless steel frame structure. The number of groups of the dial indicators 3, the detection push rods 4, and the lockers 5 can be arbitrarily selected according to the use requirements. By setting multiple groups, the elastic elements 0013 of multiple temperature bulb probe systems 001 can be detected simultaneously, which is convenient to use and reduces the overall detection time.

[0029] A locking device mounting plate 6 can be provided on the main frame body 2 by welding or screws. Each group of locking devices 5 are respectively arranged on the locking device mounting plate 6. Each group of locking devices 5 are respectively used to lock and fix the connecting cylinder body 0012 of a temperature bulb probe system 001 correspondingly. The outer shells of each group of dial indicators 3 are respectively fixed on the main frame body 2. The detection ends of each group of dial indicators 3 are respectively connected to one end of the detection push rod 4 of the same group. The other ends of each group of detection push rods 4 are respectively used to abut against the inner bottom surface of the elastic element 0013 in the connecting cylinder body 0012 locked and fixed by the locking device 5 of the same group.

[0030] Specifically, in this embodiment, the locking device mounting plate 6 is located above the constant temperature bath 1, so that the constant temperature bath 1 can be placed on the lower side of the locking device mounting plate 6 to save the overall space occupied by the device.

[0031] Specifically, in this embodiment, each group of dial indicators 3 are all located above the locking device mounting plate 6. The axial center lines of the detection ends of each group of dial indicators 3 and the axial center lines of each group of detection push rods 4 are all perpendicular to the horizontal plane. All groups of locking devices 5 are arranged in sequence in the same straight line direction, which is convenient for viewing and installation. The detection ends of each group of dial indicators 3 are respectively connected to one end of the detection push rod 4 of the same group by threads, which is convenient for disassembly and assembly. Different lengths of detection push rods 4 can be replaced according to the use requirements, and the adaptability is good; the detection push rod 4 itself can be an integral structure or a split structure that can be further disassembled. Through the cooperatively arranged dial indicator 3 and detection push rod 4, the bulging amount of the elastic element 0013 can be directly and precisely detected, and the detection accuracy can reach 0.01 mm.

[0032] Specifically, as Figure 3 shown, in this embodiment, five coil racks 7 are provided on the main frame body 2. Each coil rack 7 is respectively arranged below the locking device mounting plate 6. Each coil rack 7 is respectively used in cooperation with a group of dial indicators 3, detection push rods 4 and locking devices 5. In this embodiment, the setting structure of the coil rack 7 adopts the prior art, for example, a circular frame body can be adopted; the coil rack 7 can be fixed on the main frame body 2 by welding or screws. Since the length of the temperature bulb probe system oil pipe 0014 is generally several meters long, the temperature bulb probe system oil pipe 0014 can be wound around the corresponding coil rack 7 during detection to avoid the temperature bulb probe system oil pipe 0014 being placed in a scattered manner, which is convenient for the detection to be carried out.

[0033] Specifically, as Figure 5As shown, in this embodiment, each set of locking devices 5 includes a basic frame 501 and locking screws 502. The basic frame 501 of each set of locking devices 5 is fixed to the locking device mounting plate 6. There are two locking screws 502 provided on the basic frame 501 of each set of locking devices 5, and the axial centerlines of the respective locking screws 502 are parallel to the horizontal plane; the number and positions of the locking screws 502 can be set arbitrarily according to the outer shape of the connecting cylinder 0012 to ensure that the connecting cylinder 0012 can be fully locked and fixed. Connecting cylinder through-holes are respectively formed on the locking device mounting plate 6 corresponding to the inner spaces of the basic frames 501 of each set of locking devices 5 to facilitate the connecting cylinder 0012 to pass through and enter the inner side of the basic frame 501. Rotate the locking screws 502 of each set of locking devices 5 to simultaneously abut against the outer peripheral surface of the corresponding connecting cylinder 0012 and achieve the locking and fixing of the connecting cylinder 0012. In this embodiment, four mounting feet 503 are evenly provided on the outer peripheral surface of the basic frame 501 of each set of locking devices 5, and the respective mounting feet 503 are fixedly connected to the locking device mounting plate 6 by screws, which is easy to disassemble and assemble; the basic frame 501 of each set of locking devices 5 is rectangular, which is easy to manufacture.

[0034] The detection process in a specific embodiment of the present utility model is as follows: Place the temperature bulb probe bodies 0011 of the temperature bulb probe systems 001 to be measured in the constant temperature bath 1 respectively, and each temperature bulb probe body 0011 is fully immersed in the oil in the constant temperature bath 1; the initial temperature of the oil in the constant temperature bath 1 is set at 0°C; the connecting cylinders 0012 of each temperature bulb probe system 001 are respectively fixed in the corresponding locking devices 5, and the detection push rods 4 connected to the detection ends of the respective dial indicators 3 respectively abut against the inner bottom surfaces of the elastic elements 0013 in the connecting cylinders 0012 locked and fixed by the locking devices 5 of the same group and are in close contact with the elastic elements 0013; zero the readings of the respective dial indicators 3; gradually raise the temperature of the oil in the constant temperature bath 1 to 75°C. The heat-conducting oil in the temperature bulb probe body 0011 expands due to heat, causing the elastic element 0013 communicated therewith to deform and bulge out, and pushing the detection push rod 4 to move, and the readings of the corresponding dial indicators 3 change; after recording the readings of the dial indicators 3 at the 75-degree temperature point, raise the temperature of the oil in the constant temperature bath 1 to 150°C again, and record the readings of the dial indicators 3 again; then compare the recorded readings with the bulging amount standard table, so as to judge whether the high and low temperature bulging amounts of the elastic element 0013 are qualified.

Claims

1. A thermal expansion detection device, characterized in that: The invention comprises a thermostatic bath (1), a main frame (2), and a plurality of sets of dial indicators (3), a detection push rod (4), and a locker (5) arranged in coordination with each other. The main frame (2) is located outside the thermostatic bath (1). The thermostatic bath (1) is used to heat a temperature-bag probe body of a temperature-bag probe system immersed in the thermostatic bath (1). The main frame (2) is provided with a locking device mounting plate (6), and the locking devices (5) of each group are respectively arranged on the locking device mounting plate (6). The locking devices (5) of each group are respectively used to lock and fix a corresponding connecting cylinder of a temperature bag probe system. The outer shells of the dial indicators (3) of each group are respectively fixed on the main frame (2), and the detection ends of the dial indicators (3) of each group are respectively connected to one end of the detection push rod (4) of the same group, and the other ends of the detection push rods (4) of each group are respectively used to abut against the inner bottom surface of the elastic element in the connecting cylinder locked and fixed by the locking devices (5) of the same group.

2. A thermal expansion detection device according to claim 1, characterized in that: The locking device mounting plate (6) is located above the constant temperature bath (1).

3. A thermal expansion detection device according to claim 1, characterized in that: The dial indicators (3) of each group are located above the locking device mounting plate (6).

4. A thermal expansion detection device according to claim 1, characterized in that: The axial center line of the detection end of each group of the dial gauge (3) and the axial center line of the detection push rod (4) of each group are both perpendicular to the horizontal plane.

5. A thermal expansion detection device according to claim 1, characterized in that: The detection end of the dial gauge (3) of each group is connected to one end of the detection push rod (4) of the same group through a thread.

6. A thermal expansion detection device according to claim 1, characterized in that: A plurality of pipe coil racks (7) are provided on the main frame (2), each of the pipe coil racks (7) is arranged below the locking device mounting plate (6), and each of the pipe coil racks (7) is used in conjunction with a set of dial indicators (3), a detection push rod (4) and a locking device (5).

7. A thermal expansion detection device according to claim 1, characterized in that: The lockers (5) of all groups are arranged in sequence along the same straight line direction.

8. A thermal expansion detection device according to claim 1, characterized in that: Each group of the locking devices (5) comprises a basic frame (501) and locking screws (502). The basic frame (501) of the locking devices (5) of each group is fixed on the locking device mounting plate (6). A plurality of locking screws (502) are provided on the basic frame (501) of the locking devices (5) of each group. Connecting cylinder through openings are respectively provided on the locking device mounting plate (6) at locations corresponding to the inner space of the basic frame (501) of the locking devices (5) of each group. When the locking screws (502) of the locking devices (5) of each group are rotated, they simultaneously abut against the outer peripheral surface of the corresponding connecting cylinder and achieve locking and fixing of the connecting cylinder.

9. A thermal expansion detection device according to claim 8, characterized in that: The axial centerline of each locking screw (502) is parallel to the horizontal plane.

10. A thermal expansion detection device according to claim 8, characterized in that: A plurality of mounting feet (503) are provided on the outer peripheral surface of the base frame (501) of each group of the locking device (5), and each of the mounting feet (503) is fixedly connected to the locking device mounting plate (6) by means of screws.

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