Density meter

Abstract

The invention relates to the field of density detection, in particular to a density meter. The density meter comprises a mechanical part shell and a meter connector, an air channel used for being connected to equipment to be tested is arranged in the meter connector, an air outlet is formed in the meter connector, the electronic part shell and the mechanical part shell are independently arranged, the meter connector further comprises a penetrating-out part penetrating out of the mechanical part shell, and at least part of the penetrating-out part extends into the electronic part shell. The penetrating-out part is communicated with the air channel, and the electronic detection unit is connected with the penetrating-out part in a sealed mode. The gas to be detected can be conveniently introduced into the electronic part shell for measurement, and the penetrating part at least partially extends into the electronic part shell, so that the leaked gas cannot enter the mechanical part shell even if gas leakage occurs; therefore, the problem that a glass window of the density meter is easy to break due to easy leakage between a meter connector and a small air chamber caused by the fact that a copper pipe is welded in a mechanical part shell of the density meter in the prior art for density measurement and signal transmission of an electronic detection unit is solved.

Description

Technical Field

[0001] The invention relates to the field of density detection, in particular to a density meter. Background Art

[0002] During the use of high-voltage electrical appliances, due to their high voltage, in order to ensure a safe insulation distance, a closed shell is generally set up and filled with high-pressure sulfur hexafluoride gas to improve the insulation performance inside the electrical equipment.

[0003] The interior of the electrical equipment is in a sealed environment. During use, the density of sulfur hexafluoride needs to be maintained at all times to maintain sufficient insulation performance. Therefore, an interface is generally reserved on the housing of the electrical equipment for density detection of sulfur hexafluoride. For example, the Chinese utility model patent with application announcement number CN215117281U discloses a mechatronic sulfur hexafluoride density controller, in which the device is provided with an independent housing, a gas connection device (i.e., a meter joint) for introducing sulfur hexafluoride into the device to be tested, a needle and a dial for displaying the density value are provided in the housing, a transparent glass window is also provided on the outside of the dial for easy reading, and the gas connection device is also provided with an outlet for connecting to a structure for detecting gas density.

[0004] With the rise of intelligence, it is necessary not only to detect the gas density in the device to be tested and display it on the dial, but also to send the detected data to the background for unified monitoring. Therefore, in the prior art, an additional gas outlet is generally opened on the meter joint, and the gas outlet is located in the mechanical part housing. Specifically, a copper tube is welded on the gas outlet, a small air chamber is set at the end of the copper tube, the sensor is installed in the small air chamber through an O-ring, and the sensor is electrically connected to the signal sending device to send the detected signal to the background.

[0005] However, in the above technical solution, when welding the copper tube and the meter joint, the welding space is narrow and the welding area is small, so welding is difficult and the welding quality is difficult to control. In addition, the meter joint, the dial and the glass window are in the same space, all in the mechanical part housing. If the welding point fails, high-pressure sulfur hexafluoride gas will be introduced into the mechanical part housing, which will cause the glass window to break. In addition, in order to avoid the shaking of the pointer, silicone oil is generally set in the mechanical part housing to increase the rotation resistance of the pointer. If the welding point fails at this time, the silicone oil may flow into the device to be tested along the meter joint and the airway in the meter joint, causing a safety accident. Summary of the invention

[0006] The object of the present invention is to provide a density meter for solving the problem in the prior art that a copper tube is welded inside the mechanical part shell of the density meter to measure the density of the electronic detection unit and transmit the signal, which causes leakage between the meter joint and the small air chamber, resulting in the glass window of the density meter being easy to break.

[0007] To achieve the above purpose, the density meter in the present invention adopts the following technical solutions:

[0008] A density meter comprises a mechanical part shell and a meter joint with one end for connecting to a device to be tested and the other end extending into the mechanical part shell, an air passage for communicating with the device to be tested is arranged inside the meter joint, an air outlet for connecting to a mechanical detection unit and communicating with the air passage is arranged on the meter joint, the density meter also comprises an electronic detection unit for detecting gas density and uploading to a background and an electronic part shell for accommodating the electronic detection unit, the electronic part shell and the mechanical part shell are arranged separately, the meter joint also comprises a penetration portion extending through the mechanical part shell and at least partially extending into the electronic part shell, the penetration portion is communicated with the air passage, and the electronic detection unit is sealed and connected to the penetration portion.

[0009] The beneficial effect of the above technical solution is that the present invention improves the existing density meter, and facilitates the detection of gas density and the transmission to the background by setting an electronic detection unit and an electronic part shell. The setting of a separate electronic part shell facilitates the setting of the electronic detection unit. In addition, by setting a through-portion on the meter joint and connecting the through-portion with the airway, it is convenient to introduce the gas to be detected to other positions for convenient measurement. Since the through-portion passes through the mechanical part shell and at least partially extends into the electronic part shell, even if a gas leak occurs, the leaked gas will not enter the mechanical part shell, thereby avoiding damage to the mechanical part shell, especially the glass window in the dial, thereby solving the problem that in the prior art, the density meter welds a copper tube in the mechanical part shell to measure the density of the electronic detection unit and transmit the signal, which causes leakage between the meter joint and the small air chamber, resulting in easy breakage of the glass window of the density meter.

[0010] Furthermore, the meter joint includes a columnar boss structure integrally provided on the outer peripheral surface of the meter joint.

[0011] The beneficial effect of the above technical solution is that the integrated arrangement prevents leakage from other parts of the meter connector. If leakage occurs, it can only occur in the electronic part housing, further protecting the components in the mechanical part housing.

[0012] Furthermore, a first through hole for the through-hole to pass through is provided on the housing of the mechanical part, and the through-hole is seal-welded to the first through hole.

[0013] The beneficial effects of the above technical solution are: it is easy to set the penetration part, and the sealing ability of the mechanical part shell is enhanced by welding and sealing the first perforation and the penetration part, and the penetration is not completely separated from the mechanical part shell.

[0014] Furthermore, a concave structure recessed toward the inside of the mechanical part housing is provided on a side wall of the mechanical part housing close to the electronic part housing, and the first through-hole is provided on the concave structure.

[0015] The beneficial effect of the above technical solution is that even if deformation occurs or welding slag is generated during the welding process, the existence of the concave structure can avoid mutual interference between the mechanical part housing and the electronic part housing.

[0016] Furthermore, the penetration portion is threadably connected to the electronic detection unit, wherein one of the penetration portion and the electronic detection unit is provided with a threaded hole, and the other is provided with a stud.

[0017] The beneficial effects of the above technical solution are: reliable connection and simple structure.

[0018] Furthermore, the outlet portion is provided with a threaded hole connected to the airway, the electronic detection unit is provided with a stud threadedly matched with the threaded hole, the bottom of the threaded hole is formed with a step surface, and a first seal is sandwiched between the end face of the stud and the step surface.

[0019] The beneficial effect of the above technical solution is that it is convenient to arrange the first sealing member in the threaded hole, so as to facilitate further sealing.

[0020] Furthermore, the first sealing member is a copper pad.

[0021] The beneficial effects of the above technical solution are: the copper pad is made of a relatively soft material, which facilitates sealing, and the copper pad has a certain corrosion resistance, and can also be sealed when the gas is corrosive.

[0022] Furthermore, a second sealing member is sandwiched between the end surface of the penetration portion and the electronic detection unit.

[0023] The beneficial effect of the above technical solution is that the second sealing member is provided to prevent air or impurities inside the electronic part housing from entering the meter connector.

[0024] Furthermore, a locking nut is threadedly mounted on the outer peripheral surface of the penetration portion, the locking nut is located in the electronic part housing, and a third sealing member is sandwiched between the locking nut and the inner wall of the electronic part housing.

[0025] The beneficial effect of the above technical solution is that the electronic part housing is protected to prevent external rainwater or impurities from entering the interior of the electronic part housing.

[0026] Furthermore, the end surface of the locking nut is flush with the end surface of the penetration portion, and a second sealing member is sandwiched between the end surface of the penetration portion and the end surface of the locking nut and the electronic detection unit.

[0027] The beneficial effect of the above technical solution is that the second seal is provided to prevent air or impurities inside the electronic part housing from entering the meter connector, and the locking nut is provided to further increase the abutment area of ​​the second seal, thereby enhancing the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of Example 1 of the density meter in the present invention;

[0029] Figure 2 It is a cross-sectional schematic diagram of a meter joint of Example 1 of a density meter in the present invention;

[0030] Figure 3 It is a schematic diagram of the cooperation between the meter connector and the mechanical part housing of Example 1 of the density meter of the present invention;

[0031] Figure 4 It is a schematic diagram of the cooperation between the meter connector, the mechanical part housing and the electronic part housing of the embodiment 1 of the density meter of the present invention;

[0032] Figure 5 It is a cross-sectional schematic diagram of Example 1 of the density meter in the present invention.

[0033] In the figure: 1. Mechanical part housing; 11. Concave structure; 2. Electronic part housing; 3. Gauge joint; 31. Air duct; 32. Air outlet; 33. Air duct connection; 34. Threaded hole; 4. Electronic detection unit; 41. Stud; 51. Copper pad; 52. Second seal; 53. Third seal; 54. Lock nut. DETAILED DESCRIPTION

[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0035] In Example 1 of the density table of the present invention:

[0036] In this embodiment, the density meter includes an electronic part shell and a mechanical part shell. An electronic detection unit for detecting gas density and uploading it is arranged in the electronic part shell. The electronic part shell and the mechanical part shell are arranged independently of each other. The meter joint has an airway and a through-out portion for connecting to the electronic part shell. A connecting airway connected to the airway is arranged in the through-out portion. The detection of the electronic detection unit is facilitated through the second air outlet. Since the through-out portion directly extends into the electronic part shell, even if gas leakage occurs at the end of the through-out portion, the leaked gas will not affect the mechanical part shell and the glass window inside the mechanical part shell.

[0037] like Figure 1 and Figure 5 As shown, the density meter in this embodiment includes a mechanical part and an electronic part, and the mechanical part and the electronic part can detect the density of the gas separately, wherein the electronic part also has the function of sending outward, so as to facilitate sending the detected information to the background. The mechanical part is provided with a pointer, a dial and a glass window, so as to facilitate direct density reading. The mechanical part also has a mechanical part housing 1, and the pointer, the dial and the glass window are respectively arranged in the mechanical part housing 1. A mechanical detection unit for detecting the gas density is also arranged in the mechanical part housing 1. The mechanical detection unit is connected with the pointer and can act on the pointer with the detected density information to control the pointer to rotate. The electronic part has a sensor for detecting the density and an electronic part housing for accommodating the sensor.

[0038] like Figure 2 , Figure 3 and Figure 4 The density meter also includes a meter connector 3, one end of which is connected to the device to be tested, and the other end of which extends into the mechanical part housing 1. An air duct 31 is arranged inside the meter connector 3, and the meter connector 3 includes a meter connector body and a through-out portion for passing through the mechanical part housing 1 and at least partially extending into the electronic part housing 2. The meter connector body and the through-out portion are integrally formed, and a connecting section for connecting the device to be tested and an air outlet 32 ​​are arranged on the meter connector body, and the air outlet 32 ​​is used to connect the mechanical detection unit. The meter connector body is cylindrical as a whole, and a connecting end for connecting to the device to be tested is arranged along one end of the column, and a through-out portion is arranged on the side of the meter connector body. The air duct 31 extends from the connecting section along the inside of the column of the body. In addition, in order to facilitate the leading out of the air duct 31 on the through-out portion, a connecting air duct 33 is also arranged, and one end of the connecting air duct 33 is connected to the air duct 31, and the other end is arranged inside the through-out portion for connecting with the electronic detection unit 4.

[0039] like Figure 5As shown, the protruding portion is a boss structure protruding from the outer peripheral surface of the body, and the boss structure is cylindrical. The connecting airway 33 is opened on the axis of the boss. A threaded hole 34 is provided at one end of the protruding portion away from the body, and the threaded hole 34 is connected to the connecting airway 33. The electronic detection unit 4 has a stud 41 threadedly matched with the threaded hole 34. The bottom of the threaded hole 34 is formed with a step surface. A first sealing member is sandwiched between the end face of the stud 41 and the step surface, that is, the first sealing member is located between the stud 41 and the end face of the threaded hole 34. Under the extrusion of the stud 41, the first sealing member is slightly deformed, which is convenient for sealing. In this embodiment, sulfur hexafluoride gas needs to be detected, and sulfur hexafluoride gas has a certain corrosiveness. Therefore, the first sealing member needs to have corrosion resistance in addition to the sealing effect. Therefore, the first sealing member in this embodiment is a copper pad 51.

[0040] In order to extend the connecting airway 33 into the electronic part housing 2, the through-holes for the through-holes to pass through are respectively provided on the mechanical part housing 1 and the electronic part housing 2. In this embodiment, the mechanical part housing 1 is provided with a first through-hole, and the electronic part housing 2 is provided with a second through-hole. The through-hole is welded and sealed to the hole wall surrounding the first through-hole. The mechanical part housing 1 will be deformed during the welding process. Since the mechanical part housing 1 and the electronic part housing 2 are fitted and fixed, an inner concave structure 11 that is recessed into the mechanical part housing 1 is provided on the side wall of the mechanical part housing 1 close to the electronic part housing 2, and the first through-hole is provided in the inner concave structure 11.

[0041] like Figure 1 As shown, the density meter is set to leak out, so a sealing structure is also required to prevent external rainwater and impurities from entering the electronic part housing 2. Specifically, a second sealing member 52 is provided at the end face of the boss to abut against the electronic detection unit 4. When the stud 41 of the electronic detection unit 4 is threadedly matched with the internal threaded hole 34, the end face of the boss will abut against the electronic detection unit 4, thereby causing the area to be compressed. An external thread section is also provided on the outside of the boss, and a locking nut 54 is threadedly assembled on the external thread section. A third sealing member 53 is provided between the locking nut 54 and the electronic part housing 2, that is, the third sealing member 53 is provided inside the electronic part housing 2 to prevent external rainwater and impurities from entering, and the second sealing member 52 prevents the electronic unit housing from being connected to the second outlet. In addition, the locking nut 54 is flush with the end face of the outlet, so that the end face of the outlet and the end face of the locking nut jointly squeeze the second sealing member, and the sealing effect is better. It is worth noting that the second sealing member 52 and the third sealing member 53 are rubber sealing rings.

[0042] In Example 2 of the density meter of the present invention: Regarding the setting of the second seal, this embodiment proposes a new arrangement form. Different from Example 1, the outer diameter of the second seal in this embodiment is smaller than the outer diameter of the penetration portion. When the stopper is matched, the second seal only cooperates with the end face stop of the penetration portion and no longer cooperates with the end face stop of the locking nut.

[0043] In Example 3 of the density meter of the present invention: Regarding the setting of the meter joint and the electronic detection unit, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, a third seal is no longer set between the meter joint and the electronic detection unit.

[0044] In Example 4 of the density meter of the present invention: Regarding the setting of the electronic part housing and the electronic detection unit, this embodiment proposes a new arrangement. Different from Example 1, in this embodiment, a second seal is no longer set between the locking nut and the electronic part housing, and isolation is achieved only by relying on the sealing of the first seal.

[0045] In Example 5 of the density meter of the present invention: Regarding the setting of the first seal, this embodiment proposes a new arrangement. Different from Example 1, the first seal in this embodiment is a sealing gasket supported by other materials with elasticity and corrosion resistance, such as a polyfluororubber sealing gasket.

[0046] In Example 6 of the density meter of the present invention: Regarding the setting of the first seal, this embodiment proposes a new arrangement form. Different from Example 1, the first seal is no longer set in this embodiment, and only the second seal is set, so that the second air outlet and the electronic part shell are not connected to each other.

[0047] In Example 7 of the density meter of the present invention: Regarding the setting of the protrusion part and the electronic detection unit, this example proposes a new arrangement form. Different from Example 1, in this example, the protrusion part is set as a stud and the electronic detection unit is set as a threaded hole.

[0048] In Example 8 of the density meter of the present invention: Regarding the setting of the mechanical part shell, this example proposes a new arrangement form. Different from Example 1, the side of the mechanical part shell in this example is set as a plane, and no concave structure is set.

[0049] In Example 9 of the density meter of the present invention: Regarding the setting of the mechanical part shell, this embodiment proposes a new arrangement form. Different from Example 1, in this embodiment, a sealing ring is provided on the first perforation, and sealing is naturally performed during the process of the perforating part passing through, and welding is no longer performed at this time.

[0050] In Example 10 of the density meter of the present invention: Regarding the setting of the meter joint, this embodiment proposes a new arrangement form. Different from Example 1, the penetration portion on the meter joint in this embodiment is connected to the meter joint body by welding.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A density meter, comprising a mechanical part housing and a meter joint with one end for connecting to a device to be tested and the other end extending into the mechanical part housing, an air passage for communicating with the device to be tested is provided inside the meter joint, and an air outlet for connecting to a mechanical detection unit and communicating with the air passage is provided on the meter joint, characterized in that: The density meter also includes an electronic detection unit for detecting gas density and uploading it to the background, and an electronic part shell for accommodating the electronic detection unit. The electronic part shell and the mechanical part shell are separately arranged. The meter joint also includes a penetration portion that passes through the mechanical part shell and at least partially extends into the electronic part shell. The penetration portion is communicated with the airway, and the electronic detection unit is sealed and connected to the penetration portion.

2. The density meter according to claim 1, characterized in that: The meter joint comprises a columnar boss structure integrally convexly arranged on the outer peripheral surface of the meter joint.

3. The density meter according to claim 2, characterized in that: The mechanical part housing is provided with a first through hole for the through-hole to pass through, and the through-hole is seal-welded to the first through hole.

4. The density meter according to claim 3, characterized in that: A concave structure recessed toward the inside of the mechanical part housing is arranged on the side wall of the mechanical part housing close to the electronic part housing, and the first through hole is arranged on the concave structure.

5. The density meter according to any one of claims 1 to 4, characterized in that: The penetration portion is threadably connected to the electronic detection unit, wherein one of the penetration portion and the electronic detection unit is provided with a threaded hole, and the other is provided with a stud.

6. The density meter according to claim 5, characterized in that: The outlet portion is provided with a threaded hole connected to the airway, the electronic detection unit is provided with a stud threadedly matched with the threaded hole, the bottom of the threaded hole is formed with a step surface, and a first sealing member is sandwiched between the end surface of the stud and the step surface.

7. The density meter according to claim 6, characterized in that: The first sealing member is a copper pad.

8. The density meter according to claim 5, characterized in that: A second sealing member is also sandwiched between the end surface of the penetration portion and the electronic detection unit.

9. The density meter according to claim 6, characterized in that: A locking nut is threadedly mounted on the outer circumferential surface of the penetration portion. The locking nut is located in the electronic part housing. A third sealing member is sandwiched between the locking nut and the inner wall of the electronic part housing.

10. The density meter according to claim 9, characterized in that: The end surface of the locking nut is flush with the end surface of the penetration portion, and a second sealing member is sandwiched between the end surface of the penetration portion and the end surface of the locking nut and the electronic detection unit.

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